U.S. patent application number 11/545556 was filed with the patent office on 2007-08-23 for food strorage apparatus and method for controlling the same.
This patent application is currently assigned to Samsung Electronics Co., Ltd. Invention is credited to Joo Young Ha, Kyung Hee Hahm, Hye Ran Lee, Jae Seung Lee, Chang Hak Lim, Jung Soo Lim, Young Shik Shin.
Application Number | 20070196543 11/545556 |
Document ID | / |
Family ID | 38441650 |
Filed Date | 2007-08-23 |
United States Patent
Application |
20070196543 |
Kind Code |
A1 |
Lee; Hye Ran ; et
al. |
August 23, 2007 |
Food strorage apparatus and method for controlling the same
Abstract
A food storage apparatus to sterilize bacteria living in food
and a method of controlling the same. The method includes starting
an ordered fermentation (maturing) operation in response to a
user's input including setting of a target degree of fermentation,
detecting a present degree of fermentation of food stored in a
storage container, and applying electric energy to the food stored
in the storage container if the present degree of fermentation of
the food reaches the target degree of fermentation set by the user,
to sterilize fermentation fungi, and consequently, to restrict
further fermentation of the food.
Inventors: |
Lee; Hye Ran; (Goonpo-Si,
KR) ; Lee; Jae Seung; (Hwaseong-si, KR) ;
Hahm; Kyung Hee; (Seoul, KR) ; Shin; Young Shik;
(Seongnam-si, KR) ; Lim; Jung Soo; (Seoul, KR)
; Ha; Joo Young; (Seoul, KR) ; Lim; Chang Hak;
(Hwasung-Si, KR) |
Correspondence
Address: |
STAAS & HALSEY LLP
SUITE 700, 1201 NEW YORK AVENUE, N.W.
WASHINGTON
DC
20005
US
|
Assignee: |
Samsung Electronics Co.,
Ltd
Suwon-si
KR
|
Family ID: |
38441650 |
Appl. No.: |
11/545556 |
Filed: |
October 11, 2006 |
Current U.S.
Class: |
426/107 |
Current CPC
Class: |
F25D 2317/041 20130101;
A23L 3/36 20130101; F25D 2700/02 20130101; F25D 17/042 20130101;
A23L 3/32 20130101; F25D 23/12 20130101 |
Class at
Publication: |
426/107 |
International
Class: |
B65D 81/34 20060101
B65D081/34 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 21, 2006 |
KR |
10-2006-0016947 |
Feb 21, 2006 |
KR |
10-2006-0016948 |
Feb 21, 2006 |
KR |
10-2006-0016949 |
Claims
1. A food storage apparatus comprising at least one storage
container, wherein electric energy in the form of electric current
is applied to food stored in the storage container, to enable
sterilization of the food.
2. The apparatus according to claim 1, further comprising: at least
two first electrode units provided at the storage container and
adapted to transmit the electric energy in the form of electric
current to the food stored in the storage container.
3. The apparatus according to claim 2, further comprising: at least
one storage chamber provided with at least two second electrode
units and configured to receive the storage container, wherein the
at least two second electrode units come into contact with the at
least two first electrode units, respectively, to achieve electric
connection therebetween if the storage container is put into the
storage chamber, thereby allowing the electric current to flow
through the food inside the storage container.
4. The apparatus according to claim 3, wherein each of the at least
two second electrode units includes: an electrode housing; an
elastic member seated in the electrode housing while being fixed at
a first end thereof to the electrode housing; and a first electrode
fixed to a second end of the elastic member while protruding
outward from an entrance of the electrode housing, wherein, if an
external force is applied to the first electrode, the first
electrode is inserted into the electrode housing as the elastic
member is compressed.
5. The apparatus according to claim 3, further comprising: a door
to open and close the storage chamber; a door sensor to detect the
opening and closing of the door; a power source to supply electric
power to the at least two first electrode units; a switch provided
on a conductive path defined between the power source and the at
least two first electrode units; and a controller to turn off the
switch if the door sensor detects the opening of the door, so as to
intercept the supply of electric power from the power source to the
at least two first electrode units.
6. The apparatus according to claim 4, wherein each of the at least
two first electrode units includes: a second electrode mounted to
come into contact with an outer wall surface of the storage
container, and to come into contact with a respective one of the
first electrodes; and a third electrode mounted to come into
contact with an inner wall surface of the storage container,
wherein the second and third electrodes are coupled to each other
by passing through a hole perforated through the storage container,
to be fixedly mounted to the storage container at the outside and
inside of the storage container, respectively.
7. The apparatus according to claim 1, further comprising a
sterilizing operation mode to sterilize the food stored in the
storage container.
8. The apparatus according to claim 1, further comprising: a
display device and/or speaker to inform a user of completion of
sterilization if the food stored in the storage container is
completely sterilized.
9. A food storage apparatus comprising at least one storage
container, wherein electric energy in the form of an electric field
is applied to food stored in the storage container, to enable
sterilization of the food.
10. The apparatus according to claim 9, further comprising: at
least one storage chamber to receive the storage container; and one
or more electrode units to create the electric field in an interior
space of the storage chamber.
11. The apparatus according to claim 10, further comprising: a door
to open and close the storage chamber; a door sensor to detect the
opening and closing of the door; a power source to supply electric
power to the one or more electrode units; a switch provided on a
conductive path between the power source and the one or more
electrode units; and a controller to turn off the switch if the
door sensor detects the opening of the door, so as to intercept the
supply of electric power from the power source to the one or more
electrode units.
12. The apparatus according to claim 11, wherein a voltage of the
electric power being supplied from the power source to the one or
more electrode units is in a range from 100V to 10 kV, AC or
DC.
13. The apparatus according to claim 10, wherein the electrode
units include first and second electrode units in the form of a
plate having a predetermined area, the first and second electrode
units forming at least one pair, and being arranged at an inner
wall surface of the storage chamber at positions facing each
other.
14. The apparatus according to claim 10, wherein the electrode
units include a storage chamber electrode mounted at a wall surface
of the storage chamber and adapted to receive power, and a
plate-shaped storage container electrode mounted to the storage
container, and the storage chamber electrode and storage container
electrode come into contact with each other if the storage
container is put into the storage chamber, to allow the power
received by the storage chamber electrode to reach the storage
container electrode.
15. The apparatus according to claim 9, further comprising a
sterilizing operation mode to sterilize the food stored in the
storage container.
16. The apparatus according to claim 9, further comprising: a
display device and/or speaker to inform a user of completion of
sterilization if the food stored in the storage container is
completely sterilized.
17. A method of controlling a food storage apparatus comprising:
starting an ordered fermentation operation in response to a user's
input including setting of a target degree of fermentation;
detecting a present degree of fermentation of food stored in a
storage container; and applying electric energy to the food stored
in the storage container if the detected present degree of
fermentation of the food reaches the set target degree of
fermentation, comprising comparing the detected present degree of
fermentation with the set target degree of fermentation, to
sterilize fermentation fungi, and consequently, to restrict further
fermentation of the food.
18. The method according to claim 17, wherein the detecting of the
present degree of fermentation of food comprises determining a
state of fermentation gas generated from the food stored in the
storage container.
19. The method according to claim 18, wherein the detecting of the
present degree of fermentation of food further comprises
determining a content of carbon dioxide of the fermentation gas
generated from the food.
20. The method according to claim 18, wherein the detecting of the
present degree of fermentation of food comprises determining an
acidity of the fermentation gas generated from the food.
21. The method according to claim 18, wherein the detecting of the
present degree of fermentation of food comprises determining an
interior pressure of the storage container storing the food.
22. The method according to claim 17, further comprising: applying
electric energy to the food stored in the storage container for a
limited period to sterilize harmful bacteria regardless of the
fermentation of the food, prior to the detecting of the present
degree of fermentation of the food stored in the storage
container.
23. The method according to claim 17, further comprising: informing
a user of the completion of sterilization via a display device
and/or speaker if the food stored in the storage container is
completely sterilized.
24. The method according to claim 17, further comprising:
performing a safety mode preventing the electric energy from being
applied to the food stored in the storage container if a door of
the food storage apparatus is opened during the ordered
fermentation operation.
25. A food storage apparatus comprising at least one storage
container, wherein electric energy is applied to food stored in the
storage container, to enable sterilization of the food.
26. A method of controlling a food storage apparatus comprising:
detecting a present degree of fermentation of food stored in a
storage container; and applying electric energy to the food stored
in the storage container if the detected present degree of
fermentation of the food reaches a set target degree of
fermentation.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of Korean Patent
Application No. 10-2006-0016947, filed on Feb. 21, 2006, in the
Korean Intellectual Property Office, Korean Application No.
10-2006-0016948, filed Feb. 21, 2006 in the Korean Intellectual
Property Office and Korean Application No. 10-2006-0016949, filed
on Feb. 21, 2006 in the Korean Intellectual Property Office, the
disclosures of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a food storage apparatus
and a method of controlling the same, and, more particularly, to a
food storage apparatus to store food in a fresh state for a long
period, and a method of controlling the same.
[0004] 2. Description of the Related Art
[0005] Food storage apparatuses store food in a fresh state for a
long period. A representative example of a food storage apparatus
is a refrigerator. Recently, refrigerators have been developed to
include certain products for storing specific foods or articles.
Examples of such products include a "Kim-chi refrigerator" to store
Kimchi as a Korean representative fermented food, and the like, and
a "Cosmetics refrigerator" to preserve cosmetics for a long
period.
[0006] In the case of food, it may be processed in a state wherein
bacteria living in soil, etc. have infiltrated raw food when the
raw food was grown in the soil, and thus, part of the bacteria may
still remain in the processed food.
[0007] In particular, fermented food may be excessively fermented
(matured) during a storage period thereof because the propagation
speed of lactobacillus, etc. can increase due to a variation of
surrounding environment. Also, if a storage container is frequently
opened to take out some of the fermented food stored therein, the
fermented food may suffer from secondary contamination by aerobic
bacteria as it is exposed to the air.
SUMMARY OF THE INVENTION
[0008] Therefore, it is an aspect of the present invention to solve
the above and/or other problems.
[0009] It is an aspect of the invention to provide a food storage
apparatus and a method of controlling the same, which can
appropriately maintain the degree of fermentation of food stored
therein at a desired level by generating a sterilizing power
corresponding to the degree of fermentation of the food in
association with the sterilization of bacteria living in the
food.
[0010] It is another aspect of the present invention to provide a
food storage apparatus and a method of controlling the same, which
can prevent excessive fermentation (maturing) of food by
restricting propagation of bacteria such as lactobacillus or lactic
acid bacteria participating in the fermentation of food.
[0011] It is another aspect of the present invention to provide a
food storage apparatus and a method of controlling the same, which
can prevent secondary contamination by aerobic bacteria that may be
generated when food is taken out of a storage container and exposed
to the outside.
[0012] It is still another aspect of the present invention to
provide a food storage apparatus and a method of controlling the
same, which can ensure sterilization of raw food prior to being
processed, thereby achieving sanitary food manufacture.
[0013] Additional aspects and/or advantages of the invention will
be set forth in part in the description which follows and, in part,
will be apparent from the description, or may be learned by
practice of the invention.
[0014] The forgoing, and/or other aspects are achieved by providing
a food storage apparatus comprising at least one storage container,
wherein electric energy in the form of electric current is applied
to food stored in the storage container, to enable sterilization of
the food.
[0015] The apparatus may further comprise at least two first
electrode units provided at the storage container and adapted to
transmit the electric energy in the form of electric current to the
food stored in the storage container.
[0016] The apparatus may further comprise: at least one storage
chamber provided with at least two second electrode units and
configured to receive the storage container, and the at least two
second electrode units may come into contact with the at least two
first electrode units, respectively, to achieve electric connection
therebetween if the storage container is put into the storage
chamber, thereby allowing the electric current to flow through the
food inside the storage container.
[0017] Each of the at least two second electrode units may include:
an electrode housing; an elastic member seated in the electrode
housing while being fixed at a first end thereof to the electrode
housing; and a first electrode fixed to a second end of the elastic
member while protruding outward from an entrance of the electrode
housing, and, if an external force is applied to the first
electrode, the first electrode may be inserted into the electrode
housing as the elastic member is compressed.
[0018] The apparatus may further comprise: a door to open and close
the storage chamber; a door sensor to detect the opening and
closing of the door; a power source to supply electric power to the
at least two first electrode units; a switch provided on a
conductive path defined between the power source and the at least
two first electrode units; and a controller to turn off the switch
if the door sensor detects the opening of the door, so as to
intercept the supply of electric power from the power source to the
at least two first electrode units.
[0019] Each of the at least two first electrode units may include:
a second electrode mounted to come into contact with an outer wall
surface of the storage container, to come into contact with a
respective one of the first electrodes; and a third electrode
mounted to come into contact with an inner wall surface of the
storage container; and the second and third electrodes may be
coupled to each other by passing through a hole perforated through
the storage container, to be fixedly mounted to the storage
container at the outside and inside of the storage container,
respectively.
[0020] The apparatus may further comprise a controller to control
the electric current, wherein a sterilizing operation mode to
sterilize the food stored in the storage container may be
programmed into the controller.
[0021] The apparatus may further comprise: a display device and/or
speaker to inform a user of completion of sterilization if the food
stored in the storage container is completely sterilized.
[0022] In accordance with another aspect, the present invention
provides a food storage apparatus comprising at least one storage
container, wherein electric energy in the form of an electric field
is applied to food stored in the storage container, to enable
sterilization of the food.
[0023] The apparatus may further comprise: at least one storage
chamber to receive the storage container; and one or more electrode
units to create the electric field in an interior space of the
storage chamber.
[0024] The apparatus may further comprise: a door to open and close
the storage chamber; a door sensor to detect the opening and
closing of the door; a power source to supply electric power to the
one or more electrode units; a switch provided on a conductive path
between the power source and the one or more electrode units; and a
controller to turn off the switch if the door sensor detects the
opening of the door, so as to intercept the supply of electric
power from the power source to the one or more electrode units.
[0025] A voltage of the electric power being supplied from the
power source to the one or more electrode units may be in a range
from 100V to 10 kV (AC or DC).
[0026] The electrode units may include first and second electrode
units in the form of a plate having a predetermined area, the first
and second electrode units forming at least one pair, and being
arranged at an inner wall surface of the storage chamber at
positions facing each other.
[0027] The electrode units may include a storage chamber electrode
mounted at a wall surface of the storage chamber and adapted to
receive power, and a plate-shaped storage container electrode
mounted to the storage container, whereby the storage chamber
electrode and storage container electrode come into contact with
each other if the storage container is put into the storage
chamber, to allow the power received by the storage chamber
electrode to reach the storage container electrode.
[0028] The apparatus may further comprise a controller to control
the electric current, wherein a sterilizing operation mode to
sterilize the food stored in the storage container is programmed
into the controller.
[0029] The apparatus may further comprise: a display device and/or
speaker to inform a user of completion of sterilization if the food
stored in the storage container is completely sterilized.
[0030] The foregoing and/or other aspects may also be achieved by
providing a method of controlling a food storage apparatus
comprising: starting an ordered fermentation operation in response
to a user's input including setting of a target degree of
fermentation; detecting a present degree of fermentation of food
stored in a storage container; and applying electric energy to the
food stored in the storage container if the detected present degree
of fermentation of the food reaches the set target degree of
fermentation, comprising comparing the detected present degree of
fermentation with the set target degree of fermentation, to
sterilize fermentation fungi, and consequently, to restrict further
fermentation of the food.
[0031] The detecting of the present degree of fermentation of food
may comprise determining a state of fermentation gas generated from
the food stored in the storage container.
[0032] The detecting of the present degree of fermentation of food
may further comprise determining a content of carbon dioxide of the
fermentation gas generated from the food.
[0033] The detecting of the present degree of fermentation of food
may comprise determining an acidity (Ph) of the fermentation gas
generated from the food.
[0034] The detecting of the present degree of fermentation of food
may comprise determining an interior pressure of the storage
container storing the food.
[0035] The method may further comprise: applying electric energy to
the food stored in the storage container for a limited period to
sterilize harmful bacteria regardless of the fermentation of the
food, prior to the detecting of the present degree of fermentation
of the food stored in the storage container.
[0036] The method may further comprise: informing a user of the
completion of sterilization via a display device and/or speaker if
the food stored in the storage container is completely
sterilized.
[0037] The method may further comprise: performing a safety mode
preventing the electric energy from being applied to the food
stored in the storage container if a door of the food storage
apparatus is opened during the ordered fermentation operation.
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] These and/or other aspects and advantages of the invention
will become apparent and more readily appreciated from the
following description of the embodiments, taken in conjunction with
the accompanying drawings, of which:
[0039] FIG. 1 is a sectional view showing the configuration of a
food storage apparatus according to an embodiment of the present
invention;
[0040] FIG. 2 is a sectional view showing an embodiment of a
storage chamber electrode unit of FIG. 1;
[0041] FIG. 3 is a sectional view showing an embodiment of a
storage container electrode unit of FIG. 1;
[0042] FIG. 4 is a block diagram showing a control system of the
food storage apparatus of FIG. 1;
[0043] FIG. 5 is a sectional view showing the configuration of a
food storage apparatus according to another embodiment of the
present invention;
[0044] FIG. 6 is a sectional view showing an embodiment of a
storage container electrode unit of FIG. 5;
[0045] FIG. 7 is a flow chart showing a method of controlling the
food storage apparatus according to the embodiment of the present
invention of FIG. 1;
[0046] FIG. 8 is a sectional view showing the configuration of a
food storage apparatus according to a further embodiment of the
present invention;
[0047] FIG. 9 is a block diagram showing a control system of the
food storage apparatus of FIG. 8;
[0048] FIG. 10 is a sectional view showing another embodiment of an
electrode unit included in the food storage apparatus of FIG.
8;
[0049] FIG. 11 is a flow chart showing a method of controlling the
food storage apparatus according to the embodiment of the present
invention of FIG. 8;
[0050] FIG. 12 is a sectional view showing the configuration of a
storage container and the installation position of a fermentation
sensor included in a food storage apparatus according to yet
another embodiment of the present invention; and
[0051] FIG. 13 is a flow chart showing a method of controlling the
food storage apparatus according to the embodiment of the present
invention of FIG. 12.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0052] Reference will now be made in detail to the embodiments of
the present invention, examples of which are illustrated in the
accompanying drawings, wherein like reference numerals refer to
like elements throughout. The embodiments are described below to
explain the present invention by referring to the figures.
[0053] First, FIG. 1 is a sectional view showing the configuration
of a food storage apparatus according to an embodiment of the
present invention. As shown in FIG. 1, the food storage apparatus
includes at least one inner case 140 internally defining a storage
chamber 122 to receive at least one storage container 102, and an
outer case 180 to surround the inner case 140 with a foam space 124
therebetween. The foam space 124 is filled with an insulating
material. The inner case 140 has an upper opening 126 to put in or
take out the storage container 102. A door 128 is provided to open
and close the upper opening 126 of the inner case 140. The inner
case 140 is wrapped, around an outer surface thereof, with a
refrigerant pipe 130 serving as an evaporator to lower the
temperature of the storage chamber 122 and a heater 138 to raise
the temperature of the storage chamber 122.
[0054] A machine room 132 is provided below the inner case 140. The
machine room 132 is configured to receive a compressor 134,
condenser 136, and other electric elements (for example, a PCB
mounted with a microcomputer, power source, and various switches,
etc.). A refrigerant is compressed to have a high-temperature and
high-pressure in the compressor 134, and then is converted into a
liquid-phase refrigerant in the condenser 136. Subsequently, the
condensed high-pressure refrigerant is depressurized while passing
through a capillary tube (not shown). Thereafter, the depressurized
refrigerant is instantly evaporated in the refrigerant pipe 130
serving as an evaporator, to thereby absorb surrounding heat, and
consequently, lower the temperature of the surroundings. Cool air,
produced during the heat absorbing process, is transmitted to the
inner case 140 to keep the temperature of the storage chamber 122
at a low temperature. As a result, food stored in the storage
chamber 122 can be stored in a fresh state.
[0055] Conversely, to preserve the food in the storage chamber 122
at a relatively high temperature, the heater 138 is heated to raise
the temperature of the surroundings around the storage chamber 122.
As the raised temperature is transferred to the storage chamber 122
through the inner case 140, the interior temperature of the storage
chamber 122 can be raised.
[0056] The storage container 102 for use in the food storage
apparatus as shown in FIG. 1 is provided with storage container
electrode units 106a and 106b (i.e. first electrode units), whereas
the storage chamber 122 is provided at an inner wall surface
thereof with storage chamber electrode units 104a and 104b (i.e.
second electrode units). More particularly, two storage chamber
electrode units 104a and 104b and two storage container electrode
units 106a and 106b are provided at each storage container 102.
Positions of the storage chamber electrode units 104a and 104b and
storage container electrode units 106a and 106b are determined such
that the corresponding electrode units 104a and 106a and the
corresponding electrode units 104b and 106b come into contact with
each other, respectively, to achieve electric connection
therebetween when the storage container 102 is put (inserted) into
the storage chamber 122.
[0057] The storage chamber electrode units 104 and 104b are
installed to protrude inward inside the storage chamber 122 such
that they come into contact with the storage container electrode
units 106a and 106b to achieve electric connection therebetween
when the storage container 102 is put into the storage chamber 122.
Also, the storage chamber electrode units 104a and 104b are
connected to the power source arranged in the machine room 132 to
receive an electric power therefrom. With this arrangement, if the
storage chamber electrode units 104a and 104b come into contact
with the storage container electrode units 106a and 106b,
respectively, to achieve electric connection therebetween in a
state wherein the electric power is being supplied to the storage
chamber electrode units 104a and 104b, a closed electric circuit is
produced between the storage chamber electrode units 104a and 104b,
food 150 inside the storage container 102, and storage container
electrode units 106a and 106b (See FIG. 4). This is because the
food 150 defines a conductive path between the storage container
electrode units 106a and 106b. An electric energy in the form of
electric current is applied to the food 150 via the closed electric
circuit, to destroy the cell membrane of bacteria living in the
food 150 thereby achieving sterilization of the bacteria.
[0058] FIG. 2 is a sectional view showing an embodiment of the
storage chamber electrode units 104a and 104b of FIG. 1. Here, the
storage chamber electrode units 104a and 104b are the same, and
thus, only one storage chamber electrode unit 104a will be
explained. As shown in FIG. 2, the storage chamber electrode unit
104a includes an electrode housing 202, an elastic spring 206
inserted in the electrode housing 202, and a protruding electrode
(first electrode) 204 made of a conductive material and inserted in
the electrode housing 202 at the outer side of the spring 206 to
partially protrude out of the electrode housing 202. One end of the
spring 206 is fixed to an inner wall surface of the electrode
housing 202, and the other end of the spring 206 is fixed to the
protruding electrode 204. With this fixing structure, the spring
206 and protruding electrode 204 are able to be retained in the
electrode housing 202 so as not to be forced out of the electrode
housing 202 by an elastic force caused when the spring 206 is
extended after being compressed.
[0059] In a state wherein the storage container 102 is put into the
storage chamber 122, the elastic force of the spring 206 serves to
maintain a more positive contact state (electrically connected
state) between the protruding electrode 204 and the associated
storage container electrode unit 106a. Also, even if the protruding
electrode 204 is caught by any portion protruded from the outer
lateral surface of the storage container 102 (for example, a lid,
handle, or the like) in the course that the storage container 102
is put into or taken out of the storage chamber 122, the protruding
electrode 204 is able to be inserted into the electrode housing 202
as the spring 206 is elastically compressed, and then, is able to
be returned out of the electrode housing 202 after putting or
taking the storage container 102 into or out of the storage
container 102 as the spring 206 is elastically extended. Thereby,
the elastic force of the spring 206 serves to prevent malfunction
in the putting and taking out of the storage container 102 due to
the protruding electrode 204.
[0060] An outer end portion of the protruding electrode 204 is
rounded, to enable easier putting and taking out of the storage
container 102.
[0061] The protruding electrode 204 is connected to an electric
wire 208 for the supply of electric power. The power source (See.
FIG. 4) for supplying electric power to the protruding electrode
204 is mounted in the machine room 132 of FIG. 1. The electric wire
208 is installed to reach the power source by passing through the
foam space 124.
[0062] FIG. 3 is a sectional view showing an embodiment of the
storage container electrode units of FIG. 1. Here, the storage
container electrode units 106a and 106b are the same, and thus,
only one storage container electric unit 106a will be explained. As
shown in FIG. 3, the storage container electrode unit 106a is made
of a conductive material, and serves as an electric connector
between the interior and exterior of the storage container 102 to
create a conductive path between the storage chamber electrode
units 104a and 104b and food 150. The storage container electrode
unit 106a is divided into two parts, namely, an outer electrode
(second electrode) 302 that comes into contact with an outer wall
surface of the storage container 102, and an inner electrode (third
electrode) 304 that comes into contact with an inner wall surface
of the storage container 102. One of the outer and inner electrodes
302 and 304 is formed with a male screw, and the other one is
formed with a female screw. Also, a hole 306 is perforated through
the storage container 102 such that the male and female screws of
the outer and inner electrodes 302 and 304 are able to be fastened
to each other through the hole 306. Thereby, the outer and inner
electrodes 302 and 304 are able to be coupled to each other. In
this structure, it is desirable that portions where the outer and
inner electrodes 302 and 304 are brought into contact with the
storage container 102 be sealed to prevent leakage of the food 150
stored in the storage container 102 and to prevent exterior
impurities from entering the storage container 102.
[0063] FIG. 4 is a block diagram showing a control system of the
food storage apparatus of FIG. 1. As shown in FIG. 4, assuming that
the food 150 received in the storage container 102 is a conductive
material (for example, liquid, etc.), the food storage apparatus
according to the embodiment of the present invention produces a
closed electric circuit in the order of the power source 402,
storage chamber electrode unit 104a, storage container electrode
unit 106a, food 150, storage container electrode unit 106b, and
storage chamber electrode unit 104b if the storage container 102 is
put in the storage chamber 122.
[0064] To allow a user to more safely put or take the storage
container 102 into or out of the storage chamber 122, a switch 404
is interposed between the power source 402 and the storage chamber
electrode unit 104a. A door sensor 408 is provided to detect
whether or not the door 128 is opened. If the door 128 opens the
upper opening 126 of the storage chamber 122, a controller 406
turns off the switch 404 to intercept the flow of electric current.
Specifically, if the user opens the door 128 to put or take the
storage container 102 into or out of the storage chamber 122, the
switch 404 is turned off, and thus, no electric current flows
between the storage chamber electrode units 104a and 104b, food
150, and storage container electrode units 106a and 106b. This has
the effect of enabling the user to more safely put or take the
storage container 102 into or out of the storage chamber 122. In
addition, the food storage apparatus has a sterilizing operation
mode programmed into the controller. In the sterilizing operation
mode, the switch 404 is turned on to permit the flow of electric
current only when the user selects the sterilizing operation mode
via a user input 410, resulting in an improved convenience of use.
In a switch control operation performed by the controller 406,
turn-off control conditions of the switch 404 required upon the
opening of the door 128 should have a priority over all other
turn-on control conditions of the switch 404.
[0065] The controller 406 is connected to a display device and/or
speaker 412. The display device and/or speaker 412 serve to inform
the user that sterilization of the food 150 is completed. Informing
the completion of sterilization using the display device and/or
speaker 412 allows the user to personally confirm the completion of
sterilization, and thus, increases reliability with respect to the
completely sterilized food 150. Accordingly, the present food
storage apparatus can achieve a remarkable increase in satisfaction
of users.
[0066] FIG. 5 is a sectional view showing the configuration of a
food storage apparatus according to another embodiment of the
present invention. As shown in FIG. 5, the positions and number of
storage chamber electrode units 504a, 504b, 504c, and 504d and the
positions and shape of storage container electrode units 506a,
506b, 506c, and 506d are variable in various manners on the basis
of the size of storage containers 502a, 502b, and 502c and the
amounts of foods 550a and 550b.
[0067] Specifically, when two storage containers 502a and 502b are
stacked in two layers in the storage chamber 122 as shown in the
left portion of FIG. 5, and each of the storage container electrode
units 506a and 506b is configured to come into contact with both
lateral and bottom wall surfaces of an associated one of the
storage containers 502a and 502b, a closed electric circuit may be
produced in each storage container 502a or 502b in the order of the
power source 402, storage chamber electrode unit 504a, storage
container electrode unit 506a, food 550a, storage container
electrode unit 506b, and storage chamber electrode unit 504b, even
if the amount of the food 550a is small. As a result, electric
current can flow through the food 550a.
[0068] Also, when the single storage container 502c having a large
capacity is received in the storage chamber 122 as shown in the
right portion of FIG. 5, the storage container electrode units 506c
and 506d are installed at a lower surface of the storage container
502c, and the storage chamber electrode units 504c and 504d are
installed at a bottom surface of the storage chamber 122. In this
structure, a closed electric circuit may be produced in the order
of the power source 402, storage chamber electrode unit 504c,
storage container electrode unit 506c, food 550b, storage container
electrode unit 506d, and storage chamber electrode unit 504d,
regardless of the amount of the food 550b stored in the storage
container 502c. As a result, electric current can flow through the
food 550b.
[0069] FIG. 6 is a sectional view showing an embodiment of one of
the storage container electrode units of FIG. 5. Here, the storage
container electrode units 506a to 506d are the same, and thus, only
one storage container electrode unit 506a will be explained. As
shown in FIG. 6, the storage container electrode unit 506a is made
of a conductive material, and serves as an electric connector
between the interior and exterior of the associated storage
container, for example, the storage container 502a, to create a
conductive path between the associated storage chamber electrode
unit 504a and food 550a. The storage container electrode unit 506a
is divided into two parts, namely, an outer electrode 602 that
comes into contact with an outer wall surface of the storage
container 502a, and an inner electrode 604 that comes into contact
with an inner wall surface of the storage container 502a. One of
the outer and inner electrodes 602 and 604 is formed with a male
screw, and the other is formed with a female screw. Also, a hole
606 is perforated through the storage container 502a such that the
male and female screws of the outer and inner electrodes 602 and
604 are able to be fastened to each other through the hole 606. As
a result, the outer and inner electrodes 602 and 604 are able to be
coupled to each other. In this structure, it is desirable that
portions where the outer and inner electrodes 602 and 604 are
brought into contact with the storage container 502a be sealed to
prevent leakage of the food stored in the storage container 502a
and to prevent exterior impurities from entering the storage
container 502a.
[0070] In the present embodiment, the inner electrode 604 has an
L-shaped cross section such that the inner electrode 604 comes into
contact with the lateral and bottom wall surfaces of the storage
container 502a. The inner electrode 604 is coupled to the outer
electrode 602 with a bottom wall of the storage container 502a
therebetween. Such a configuration of the storage container
electrode unit 506a is used as a precaution with regard to the
small amount of the food 550a.
[0071] FIG. 7 is a flow chart showing a method of controlling the
food storage apparatus according to the embodiment of FIG.1. As
shown in FIG. 7, if the user selects the sterilizing operation mode
via the user input 410, a sterilizing operation starts in response
to the user's input (operation 702).
[0072] If the sterilizing operation starts, a safety mode is also
performed to prevent electric energy from being supplied to the
food 150 received in the storage container 102 as soon as the door
128 is opened (operation 704). The safety mode is continuously
activated during the sterilizing operation for the sake of the
user's safety.
[0073] Then, electric energy is supplied to the food 150 stored in
the storage container 102 to destroy the cell membrane of harmful
bacteria (microorganisms), so as to achieve sterilization of the
food 150 (operation 706).
[0074] Once the electric energy is supplied to the food 150 to
destroy the harmful bacteria, whether or not harmful bacteria
living in the food 150 are completely sterilized is monitored
(operation 708). Bacteria tend to discharge unique chemical
materials during their existence. Therefore, it can be determined
whether the harmful bacteria living in the food 150 are mostly
destroyed by the supplied electric energy or still remain, based on
the discharge of the chemical materials. If it is determined that
the sterilization of the harmful bacteria is completed (as
designated by the arrow "YES" in the operation 708), the display
device and/or speaker 412 informs the user of the completion of
sterilization (operation 710). Informing the completion of
sterilization using the display device and/or speaker 412 allows
the user to personally confirm the completion of sterilization of
the food 150, and provides the user with reliability with respect
to the completely sterilized food 150, resulting in a remarkable
increase in satisfaction of users with respect to the food storage
apparatus. Even after the completion of sterilization is informed,
the electric energy is continuously supplied to the food 150 to
continue the sterilization of harmful bacteria. This has the effect
of restricting propagation of aerobic bacteria due to the opening
of the storage container 102.
[0075] Then, if the user selects the end of the sterilizing
operation using the user input 410, and the controller 406 receives
the end command (as designated by the arrow "YES" in the operation
712), the supply of electric energy to the food 150 is intercepted
in response to the user's selection, to end the sterilizing
operation (operation 714).
[0076] FIG. 8 is a sectional view showing the configuration of a
food storage apparatus according to a further embodiment of the
present invention. As shown in FIG. 8, the food storage apparatus
includes at least one inner case 840 internally defining a storage
chamber 822 to receive at least one storage container 802, and an
outer case 880 to surround the inner case 840 with a foam space 824
therebetween. The foam space 824 is filled with an insulating
material. The inner case 840 has an upper opening 826 to put or
take the storage container 802 into or out of the storage chamber
822. A door 828 is provided to open and close the upper opening 826
of the inner case 840. The inner case 840 is wrapped, around an
outer surface thereof, with a refrigerant pipe 830 serving as an
evaporator to lower the temperature of the storage chamber 822 and
a heater 838 to raise the temperature of the storage chamber
822.
[0077] A machine room 832 is provided below the inner case 840. The
machine room 832 receives a compressor 834, condenser 836, and
other electric elements (for example, a PCB provided with a
microcomputer, power source, and various switches, etc.). A
refrigerant is compressed to have a high-temperature and
high-pressure in the compressor 834, and then, is converted into a
liquid-phase refrigerant in the condenser 836. Subsequently, the
condensed high-pressure refrigerant is depressurized while passing
through a capillary tube (not shown). Thereafter, the depressurized
refrigerant is instantly evaporated in the refrigerant pipe 830
serving as an evaporator, to thereby absorb surrounding heat, and
consequently, lower the temperature of the surroundings. Cool air,
produced during the heat absorbing process, is transmitted to the
inner case 840 to keep the temperature of the storage chamber 822
low. As a result, food stored in the storage chamber 822 can be
stored in a fresh state.
[0078] Conversely, to preserve the food in the storage chamber 822
at a relatively high temperature, the heater 838 is heated to raise
the temperature of the surroundings around the storage chamber 822.
As the raised temperature is transferred to the storage chamber 822
through the inner case 840, the interior temperature of the storage
chamber 822 can be raised.
[0079] The food storage apparatus shown in FIG. 8 is provided with
one or more electrode units 804a and 804b to create an electric
field in the storage chamber 822. The electrode units 804a and 804b
include plate-shaped first and second electrode units having a
predetermined area. The first and second electrode units 804a and
804b, which form a pair, are attached to an inner wall surface of
the storage chamber 822 at positions facing each other. The first
and second electrode units 804a and 804b are connected to the power
source (See FIG. 9) arranged in the machine room 832 to receive
electric power therefrom.
[0080] If an appropriate level of electric potential difference
(for example, 100V to 10 kV (AC or DC)) is imparted between the
first and second electrode units 804a and 804b, an electric field
depending on the electric potential difference is created between
the first and second electrode units 804a and 804b. Electric energy
in the form of the electric field is applied to the food 850, to
destroy the cell membranes of bacteria living in the food 850 for
achieving sterilization of the food 850.
[0081] FIG. 9 is a block diagram showing a control system of the
food storage apparatus of FIG. 8. As shown in FIG. 9, in the food
storage apparatus, the electric field is created between the first
and second electrode units 804a and 804b when an electric power is
supplied from a power source 902 to the first and second electrode
units 804a and 804b. To allow the user to more safely put or take
the storage container 802 into or out of the storage chamber 822, a
switch 904 is interposed between the power source 902 and the first
electrode unit 804a. A door sensor 908 is provided to detect
whether or not the door 828 is opened. If the door 828 opens the
upper opening 826 of the storage chamber 822, a controller 906
turns off the switch 904 so as not to create the electric field
between the first and second electrode units 804a and 804b.
Specifically, if the user opens the door 828 to put or take the
storage container 802 into or out of the storage chamber 822, the
switch 904 is turned off, and thus, no electric field is created.
This has the effect of enabling the user to more safely put or take
the storage container 802 into or out of the storage chamber 822.
In addition, the food storage apparatus has a sterilizing operation
mode. In the sterilizing operation mode, the switch 904 is turned
on to permit the supply of electric power to the first electrode
unit 804a only when the user selects the sterilizing operation mode
via a user input 910, resulting in an improved convenience of use.
In a switch control operation performed by the controller 906,
turn-off control conditions of the switch 904 required upon the
opening the door 828 should have a priority over all other turn-on
control conditions of the switch 904. In FIG. 9, reference numeral
914 denotes the electric field.
[0082] The controller 906 is connected to a display device and/or
speaker 912. The display device and/or speaker 912 serve to inform
the user of the fact that sterilization of the food 850 is
completed. Informing the completion of sterilization using the
display device and/or speaker 912 allows the user to personally
confirm the completion of sterilization of the food 850, and
provides the user with reliability with respect to whether the food
850 is completely sterilized. Accordingly, the present food storage
apparatus can achieve a remarkable increase in satisfaction of
users.
[0083] FIG. 10 is a sectional view showing another embodiment of
the electrode units included in the food storage apparatus of FIG.
8. As shown in FIG. 10, each storage container 802 is provided with
a pair of electrode units 1004a and 1006a.
[0084] The pair of electrode units 1004a and 1006a includes a
storage chamber electrode 1004a mounted at an inner wall surface of
storage chamber 1022 while being connected to the power source (for
example, as designated by reference numeral 902 of FIG. 9), and a
plate-shaped storage container electrode 1006a attached to an outer
surface of the storage container 1002. If the storage container
1002 is put into the storage chamber 1022, the storage chamber
electrode 1004a and storage container electrode 1006a come into
contact with each other, to allow a power supplied from the power
source 902 to reach the storage container electrode 1006a by
passing through the storage chamber electrode 1004a. In this case,
an electric field is created by electric potential difference
between the storage container electrode 1006a and food 1050
received in the storage container 1002. The electric field enables
sterilization of bacteria living in the food 1050. The storage
chamber electrode 1004a of FIG. 10 may have the same configuration
as that of FIG. 2. A foam space 1024 is filled with an insulating
material.
[0085] FIG. 11 is a flow chart showing a method of controlling the
food storage apparatus according to the embodiment of FIG. 9. As
shown in FIG. 11, if the user selects a sterilizing operation mode
via the user input 910, a sterilizing operation starts in response
to the user's input (operation 1102).
[0086] If the sterilizing operation starts, a safety mode is also
performed to prevent electric energy from being supplied to the
food 850 stored in the storage container 802 as soon as the door
828 is opened (operation 1104). The safety mode is continuously
activated during the sterilizing operation for the sake of the
user's safety.
[0087] Then, electric energy is supplied to the food 850 stored in
the storage container 802 to destroy the cell membrane of harmful
bacteria (microorganisms), so as to achieve sterilization of the
food 850 (operation 1106). To destroy almost all harmful bacteria
living in the food 850, it is desirable that a time required for
sterilizing 99% or more of harmful bacteria living in the food 850
be measured via an experiment, and an electric energy supply time
be determined based on the experimental result.
[0088] Once the electric energy is supplied to the food 850 to
destroy the harmful bacteria, whether or not harmful bacteria
living in the food 850 are completely sterilized is monitored
(operation 1108). Bacteria tend to discharge unique chemical
materials during their existence. Therefore, it can be determined
whether harmful bacteria living in the food 850 are mostly
destroyed by the supplied electric energy or still remain, based on
the discharge of the chemical materials. If it is determined that
the sterilization of the harmful bacteria is completed (as
designated by the arrow "YES" in operation 1108), the display
device and/or speaker 912 informs the user of the completion of
sterilization (operation 1110). Informing the completion of the
sterilization using the display device and/or speaker 912 allows
the user to personally confirm the completion of the sterilization
of the food 850, and provides the user with reliability with
respect to the completely sterilized food 850, resulting in a
remarkable increase in satisfaction of users. Even after the
completion of the sterilization is informed, the electric energy is
continuously supplied to the food 850 to continue the sterilization
of harmful bacteria. This has the effect of restricting propagation
of aerobic bacteria due to the opening of the storage container
802.
[0089] Then, if the user selects the end of the sterilizing
operation using the user input 910, and the controller 1106
receives the end command (as designated by the arrow "YES" in the
operation 1112), the supply of electric energy to the food 850 is
intercepted in response to the user's selection, to end the
sterilizing operation (operation 1114).
[0090] In an experiment to confirm sterilizing effects an electric
current of 0.001 A is applied at a voltage of 100V to 10 kV (AC or
DC) to a colon bacilli culture solution. In accordance with the
following experimental results as illustrated below, the
destruction rate of colon bacilli is more than 90% after 3 hours,
and more than 99% after 4 hours.
TABLE-US-00001 Number of living colon bacilli Destruction amount
Time (hr) individuals (CFU/ml) (%) 0 3 .times. 10.sup.7 0 1 1.2
.times. 10.sup.7 60 2 8.3 .times. 10.sup.6 72.3 4 3.3 .times.
10.sup.4 99.89 6 5.2 .times. 10.sup.3 99.98
[0091] FIG. 12 is a sectional view showing the configuration of a
storage container and the installation position of a fermentation
sensor in accordance with yet another embodiment of the present
invention. As shown in FIG. 12, a storage container 1202 is
perforated, through a lateral wall at a position close to an upper
end thereof, with a hole having a relatively small size. The hole
is closed by a permeable member 1206 made of a certain material
such as GORE-TEX.RTM. to allow permeation of gas, but to prevent
permeation of a liquid. Accordingly, the permeable member 1206
discharges a small amount of fermentation gas inside the storage
container 1202 to the outside.
[0092] A fermentation sensor 1204 is mounted in an inner wall
surface of the inner case 140 to be exposed to the storage chamber
122. The fermentation sensor 1204 is used to detect the degree of
fermentation of food 1250 stored in the storage container 1202 and
to detect the propagation of bacteria living in the food 1250.
Accordingly, it is desirable that the fermentation sensor 1204 be
mounted at a position as close as possible to the permeable member
1206 when the storage container 1202 is put into the storage
chamber 122.
[0093] The fermentation sensor 1204 may be a gas sensor to detect
the degree of fermentation of food based on the content of carbon
dioxide of fermentation gas generated from fermented food, or may
be an acidimeter sensor to detect the acidity (Ph) of fermentation
gas. Also, because the interior pressure of the storage container
1202 increases in proportion to the progression of fermentation of
food therein, the degree of fermentation of food can be determined
as a pressure sensor detects a variation in the interior pressure
of the storage container 1202.
[0094] FIG. 13 is a flow chart illustrating a method of controlling
the food storage apparatus according to the embodiment of FIG. 12.
As shown in FIG. 13, if the user selects an ordered fermentation
(maturing) operation mode via the user input 410, an ordered
fermentation (maturing) operation starts in response to the user's
input (operation 1302). When selecting the ordered fermentation
(maturing) operation mode via the user input 410, the user also
sets a desired target degree of fermentation. Here, the target
degree of fermentation may be classified into High, Middle, and Low
levels, or may be classified into numbered levels ranging from 0 to
9. Of course, other various methods may be used to classify the
target degree of fermentation.
[0095] If the ordered fermentation (maturing) operation starts, a
safety mode is also performed to prevent electric energy from being
supplied to the food 1250 stored in the storage container 1202 as
soon as the door 128 is opened (operation 1304). The safety mode is
continuously activated during the ordered fermentation (maturing)
operation for the sake of the user's safety.
[0096] Meanwhile, prior to starting the ordered fermentation
(maturing) operation of the food 1250 stored in the storage
container 1202 (namely, in the early stage of storage), electric
energy is supplied to the food 1250 for a limited period to destroy
harmful bacteria that may live in the food 1250 (operation 1306).
In this case, it should be noted that, if the electric energy is
supplied to the food 1250 indefinitely, it may prevent propagation
of beneficial fungi (for example, lactobacillus or lactic acid
bacteria, etc.) participating in the fermentation of the food 1250.
Therefore, it is desirable that the supply of electric energy for
the sterilization of harmful bacteria be performed only for a
limited period, and then, be stopped to allow the propagation of
the fermentation fungi (operation 1308).
[0097] If the supply of electric energy to the food 1250 is
stopped, the fermentation fungi starts to propagate, to progress
fermentation (maturing) of the food 1250. Accordingly, once the
supply of electric energy to the food 1250 is intercepted, whether
or not the present fermentation (maturing) amount of the food 1250
reaches the preset target fermentation amount is monitored
(operation 1310). If the present fermentation amount of the food
1250 does not reach the target fermentation amount (as designated
by the arrow "No" in the operation 1310), the supply of electric
energy is continuously intercepted, to allow the fermentation fungi
to continue propagation thereof, and thus, to achieve further
fermentation (maturing) of the food 1250. Conversely, if the
present fermentation amount of the food 1250 reaches the target
fermentation amount (as designated by the arrow "YES" in the
operation 1310), the supply of electric energy to the food 1250 is
initiated to sterilize the fermentation fungi, so as to prevent
further fermentation (maturing) of the food 1250 (operation 1312).
In this way, initiating the supply of electric energy to the food
1250 causes sterilization of almost all fermentation fungi as well
as harmful bacteria, resulting in an interruption in the
fermentation of the food 1250.
[0098] After the supply of electric energy to the food 1250 is
initiated, whether or not the fermentation fungi living in the food
1250 are completely sterilized is monitored (operation 1314).
Bacteria including the fermentation fungi tend to discharge unique
chemical materials during their existence. Therefore, it can be
determined whether the fermentation fungi living in the food 1250
are mostly destroyed by the supplied electric energy or still
remain, based on the discharge of the chemical materials. If it is
determined that the sterilization of the fermentation fungi is
completed (as designated by the arrow "YES" in the operation 1314),
the display device and/or speaker 412 informs the user of the
completion of sterilization (operation 1316). Informing the
completion of sterilization using the display device and/or speaker
412 allows the user to personally confirm the completion of
sterilization, and provides the user with assurance with respect to
the completely sterilized food 1250, resulting in a remarkable
increase in satisfaction of users with respect to the food storage
apparatus. Even after the completion of sterilization is informed,
the electric energy is continuously supplied to the food 1250 to
continue sterilization of the fermentation fungi. This has the
effect of restricting further fermentation of the food 1250, and
preventing propagation of aerobic bacteria caused when the food
1250 is exposed to the air via the opening of the storage container
1202.
[0099] Then, if the user selects the end of the ordered
fermentation (maturing) operation using the user input 410, and the
controller 406 receives the end command (as designated by the arrow
"YES" in the operation 1318), the supply of electric energy to the
food 1250 is intercepted in response to the user's selection, to
end the ordered fermentation (maturing) operation (operation
1320).
[0100] With the use of the present food storage apparatus and
method of controlling the same, accordingly, sterilization of
bacteria living in raw food prior to being processed can be
accomplished.
[0101] As apparent from the above description, the embodiments of
the present invention provide the following effects.
[0102] First, a food storage apparatus is designed to apply
electric energy, in the form of electric current, to food stored in
a storage container, so as to destroy the cell membrane of
microorganisms living in the food, and consequently, sterilize the
food. This has the effect of maintaining the food in a fresh state
for a long period.
[0103] In particular, in addition to sterilizing harmful bacteria,
the present food storage apparatus has a function of sterilizing
lactobacillus or lactic acid bacteria participating in fermentation
of food if necessary, so as to restrict excessive maturing (or
fermentation) of food. This enables the freshness of food to be
kept at a target level.
[0104] Furthermore, the present embodiments prevent secondary
contamination by aerobic bacteria that may be caused when food is
exposed to the air in the course of being taken out of the storage
container.
[0105] Finally, the present embodiments enable sterilization of raw
materials prior to being processed, resulting in more sanitary food
manufacture.
[0106] Although a few embodiments of the present invention have
been shown and described, it would be appreciated by those skilled
in the art-that changes may be made in these embodiments without
departing from the principles and spirit of the invention, the
scope of which is defined in the claims and their equivalents.
* * * * *