U.S. patent application number 10/753430 was filed with the patent office on 2005-02-17 for heating apparatus of washing machine and control method thereof.
Invention is credited to Jeon, Si Moon, Kim, Jin Woong, Oh, Soo Young, Woo, Kyung Chul.
Application Number | 20050034250 10/753430 |
Document ID | / |
Family ID | 33563047 |
Filed Date | 2005-02-17 |
United States Patent
Application |
20050034250 |
Kind Code |
A1 |
Oh, Soo Young ; et
al. |
February 17, 2005 |
Heating apparatus of washing machine and control method thereof
Abstract
A heating apparatus of a washing machine comprises: a steam
generator for generating steam; and a spray nozzle for spraying
steam generated from the steam generator into a tub, in which a
water level sensor for detecting a level of water supplied for
steam generation step by step is mounted at the steam generator.
According to this, an entire size of the washing machine is
reduced, an amount of washing water is reduced, and a water level
inside the steam generator is detected more accurately, thereby
enhancing a performance of the heating apparatus.
Inventors: |
Oh, Soo Young; (Seoul,
KR) ; Woo, Kyung Chul; (Seoul, KR) ; Kim, Jin
Woong; (Gwangmyeong, KR) ; Jeon, Si Moon;
(Seoul, KR) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
33563047 |
Appl. No.: |
10/753430 |
Filed: |
January 9, 2004 |
Current U.S.
Class: |
8/159 ; 68/12.19;
68/15; 68/207; 8/158 |
Current CPC
Class: |
D06F 39/008
20130101 |
Class at
Publication: |
008/159 ;
008/158; 068/015; 068/012.19; 068/207 |
International
Class: |
D06F 039/02 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 13, 2003 |
KR |
56267/2003 |
Claims
What is claimed is:
1. A heating apparatus of a washing machine comprising: a steam
generator for generating steam; and a spray nozzle for spraying
steam generated from the steam generator into a tub, in which a
water level sensor for detecting a level of water supplied for
steam generation step by step is mounted at the steam
generator.
2. The apparatus of claim 1, wherein the steam generator comprises:
a hermetic container to which a water supply tube for supplying
water and a steam exhaustion tube for exhausting generated steam
are respectively connected; a heater arranged at a bottom of the
hermetic container for heating water supplied into the hermetic
container; and a water level sensor mounted in the hermetic
container for detecting a level of water supplied into the hermetic
container step by step.
3. The apparatus of claim 2, wherein the water level sensor
comprises: one common electrode bar; a plurality of water level
detecting electrode bars of different lengths; and a supporting
member for mounting the common electrode bar and the plurality of
water level detecting electrode bars with an insulated state.
4. The apparatus of claim 3, wherein the water level detecting
electrode bars comprises: a first electrode for detecting a lowest
water level; and a second electrode for detecting a highest water
level.
5. The apparatus of claim 4, wherein the first electrode bar has a
length for detecting a level of water supplied into the hermetic
container that a heater can be immersed in water.
6. The apparatus of claim 4, wherein the second electrode has a
length for detecting a water level having a space at an upper
portion of the hermetic container in order to generate steam by
heating water by the heater.
7. A heating method of a washing machine comprising: a first step
of supplying water into a steam generator; a second step of
detecting whether a level of water supplied into the steam
generator has reached a set level; a third step of turning on a
heater and thereby generating steam when the water level has
reached a set level in the second step; and a fourth step of
performing a washing operation when steam generated from the steam
generator has been supplied into a tub and thereby temperature
inside the tub has reached a set temperature in the third step.
8. The method of claim 7, wherein the set level is a highest level
of water supplied into the steam generator.
9. The method of claim 8, wherein a voltage between a common
electrode bar and a second electrode bar is applied into a
controller when the second electrode bar of a water level sensor is
in contact with water in the second step.
10. The method of claim 7, further comprising a step of turning off
the heater when a water level inside the steam generator is lower
than a lowest water level.
11. The method of claim 10, wherein the lowest water level is a
water level that a first electrode bar of a water level is in
contact with water.
12. The method of claim 7, wherein the set temperature is
temperature inside a tub selected by a user.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a heating apparatus for
heating laundry of a washing machine, and more particularly, to a
heating apparatus for heating laundry by directly spraying steam
into the laundry and a control method thereof.
[0003] 2. Description of the Conventional Art
[0004] FIG. 1 is a sectional view of a washing machine in
accordance with the conventional art.
[0005] The drum washing machine according to the conventional art
comprises: a cabinet 102 for forming an appearance; a tub 104
arranged in the cabinet 102 for storing washing water; a drum 106
rotatably arranged in the tub 104 for washing and dehydrating
laundry; and a driving motor 110 connected to the drum 106 by a
driving shaft 108 for rotating the drum 106.
[0006] The tub 104 is shock-absorbingly supported in the cabinet
102 by dampers 120 and 122, and a heater 130 for heating washing
water stored in the tub 104 is installed at a lower portion of the
tub 104.
[0007] A lower portion of the tub 104 has to be provided with
enough space for mounting the heater 130, and water level more than
a certain height has to be maintained in the tub 104 so that the
heater 130 can be sufficiently soaked by washing water.
[0008] Operation of the conventional drum washing machine will be
explained. First, once the washing machine is operated, washing
water is supplied into the tub 104. Then, if the water level of the
tub 104 reaches a set level, the heater 130 is operated thus to
heat the washing water. At the same time, a driving motor 110 is
driven with a forward rotation or a reverse rotation thus to
perform a washing operation. According to this, when temperature of
the washing water reaches a set temperature, the heater 130 becomes
off.
[0009] However, in the conventional washing machine, a space for
accommodating the heater 130 which heats laundry has to be provided
at the lower portion of the tub 104, so that an entire size of the
washing machine becomes large. Besides, since washing water has to
be also provided at the space for accommodating the heater 130,
waste of washing water becomes great.
[0010] Furthermore, washing water is heated by the heater 130 thus
to increase a consumption electric power of the heater, to increase
a detergent amount, and to lengthen washing time.
SUMMARY OF THE INVENTION
[0011] Therefore, an object of the present invention is to provide
a heating apparatus of a washing machine capable of reducing an
entire size of the washing machine, reducing an amount of washing
water, minimizing a consumption electric power, and reducing
washing time by heating laundry by directly spraying steam into the
laundry by a steam generator provided at the washing machine.
[0012] To achieve these and other advantages and in accordance with
the purpose of the present invention, as embodied and broadly
described herein, there is provided a heating apparatus of a
washing machine comprising: a steam generator for generating steam;
and a spray nozzle for spraying steam generated from the steam
generator into a drum.
[0013] The steam generator is provided with a water level sensor
for detecting a level of water supplied for steam generation step
by step.
[0014] The steam generator comprises: a hermetic container to which
a water supply tube for supplying water and a steam exhaustion tube
for exhausting generated steam are respectively connected; a heater
arranged at a bottom of the hermetic container for heating water
supplied into the hermetic container; and a water level sensor
mounted in the hermetic container for detecting a level of water
supplied into the hermetic container step by step.
[0015] The water level sensor comprises: one common electrode bar;
a plurality of water level detecting electrode bars of different
lengths; and a supporting member for mounting the common electrode
bar and the plurality of water level detecting electrode bars with
an insulated state.
[0016] To achieve these and other advantages and in accordance with
the purpose of the present invention, as embodied and broadly
described herein, there is also provided a heating method of a
washing machine comprising: a first step of supplying water into a
steam generator; a second step of detecting whether a level of
water supplied into the steam generator has reached a set level; a
third step of generating steam by turning on a heater when the
level of water has reached a set level in the second step; and a
fourth step of performing a washing operation when steam generated
from the steam generator has been supplied into a drum and thereby
temperature inside the drum has reached a set temperature in the
third step.
[0017] The foregoing and other objects, features, aspects and
advantages of the present invention will become more apparent from
the following detailed description of the present invention when
taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings, which are included to provide a
further understanding of the invention and are incorporated in and
constitute a part of this specification, illustrate embodiments of
the invention and together with the description serve to explain
the principles of the invention.
[0019] In the drawings:
[0020] FIG. 1 is a sectional view of a washing machine in
accordance with the conventional art;
[0021] FIG. 2 is a perspective view showing an opened front surface
of a washing machine according to the present invention;
[0022] FIG. 3 is a partially-cut perspective view of a steam
generator of the washing machine according to the present
invention;
[0023] FIG. 4 is a perspective view of a water level sensor
according to the present invention;
[0024] FIG. 5 is a block diagram showing a heating method of a
heating apparatus of the washing machine according to the present
invention; and
[0025] FIG. 6 is a flow chart showing the heating method of the
washing machine according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0026] Reference will now be made in detail to the preferred
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings.
[0027] FIG. 2 is a perspective view showing an opened front surface
of a washing machine according to the present invention.
[0028] The washing machine according to one embodiment of the
present invention comprises: a cabinet 10 for forming an appearance
thereof; an outer tub 14 shock-absorbingly supported by a damper 12
in the cabinet 10 for storing washing water; an inner tub (drum) 16
rotatably arranged in the outer tub 14 for washing and dehydrating
laundry; and a heating unit arranged at an upper side of the
cabinet 10 for spraying steam into laundry received into the inner
tub 16.
[0029] A detergent box 20 connected to a water supply tube 18 is
installed at an upper side of the outer tub 14 thus to supply
detergent with washing water into the outer tub 14.
[0030] The heating unit is composed of a steam generator 24
arranged at an upper side of the cabinet 10 for generating steam,
and a spray nozzle 26 for spraying steam generated from the steam
generator 24 into the inner tub 16. Also, a circulation pump 28 for
pumping water exhausted from the outer tub 16 and thereby
re-supplying into the inner tub 16 through the spray nozzle 26 is
installed at a lower side of the cabinet 10.
[0031] Herein, a diverge unit 30 for preventing circulation water
circulated by a pumping power of the circulation pump 28 from being
mixed with steam generated from the steam generator 24 is installed
at the spray nozzle 26.
[0032] The steam generator 24 is connected to a water supply tube
32 thus to receive water from outside, and connected to the diverge
unit 30 by a steam supply tube 34. Herein, at one side of the water
supply tube 32, a water supply valve 40 for opening and closing the
water supply tube 32 is mounted. The circulation pump 28 is
connected to an exhaustion pipe 36 for exhausting washing water
stored in the outer tub 14, and is connected to the diverge unit 30
by a circulation tube 38.
[0033] Also, a temperature sensor 42 for detecting temperature
inside the inner tub 16 at the time of spraying steam into the
inner tub 16 through the spray nozzle 26 is installed in the inner
tub 16.
[0034] FIG. 3 is a partially-cut perspective view of the steam
generator of the washing machine according to the present
invention.
[0035] The steam generator 24 comprises: a hermetic container 50 to
which a water supply tube 32 and a steam exhaustion tube 34 are
respectively connected; a heater 52 arranged at a bottom of the
hermetic container 50 for heating water supplied into the hermetic
container 50; and a water level sensor 54 mounted in the hermetic
container for detecting a level of water supplied into the hermetic
container 50 step by step.
[0036] An upper container 56 and a lower container 58 of the
hermetic container 50 are hermetically mounted with a certain space
therein. A water supply port 60 connected to the water supply tube
32 is formed at one side of the upper container 56, and a steam
exhaustion port 62 connected to the steam supply tube 34 for
exhausting steam generated in the hermetic container 50 is formed
at the lower container 58.
[0037] As shown in FIG. 4, the water level sensor 54 comprises: one
common electrode bar 70; a plurality of water level detecting
electrode bars 72 and 74 of different lengths; and a supporting
member 76 hermetically mounted at the hermetic container 50 and for
mounting the common electrode bar 70 and the plurality of water
level detecting electrode bars 72 and 74 with an insulated
state.
[0038] Among the common electrode bar 70 and the plurality of water
level detecting electrode bars 72 and 74, the common electrode bar
70 is the longest. Also, the water level detecting electrode bars
72 and 74 have a different length each other in order to detect a
water level step by step. Under this state, if the common electrode
bar 70 and one of the water level detecting electrode bars 72 and
74 are in contact with water, the common electrode bar 70 is
electrically connected to one of the water level detecting
electrode bars thus to generate a voltage. At this time, voltages
generated from the water level detecting electrode bars 72 and 74
are different each other, thereby detecting a water level by a
voltage difference.
[0039] The water level detecting electrode bars 72 and 74 are
composed of a first electrode 72 for detecting a lowest water level
L1 supplied into the hermetic container 50, and a second electrode
74 for detecting a highest water level L2.
[0040] The water level detecting electrode bars are not limited to
the first electrode 72 and the second electrode 74, but can be
constituted as plural electrodes in order to detect a middle water
level.
[0041] Herein, the first electrode 72 has a length for detecting
the lowest water level L1 that the heater 52 can be immersed in
water. Also, the second electrode 74 has a certain length for
maintaining a minimum space inside the hermetic container 50
capable of generating steam.
[0042] The supporting member 76 is formed of material for
insulation and a hermetic state, and is hermetically mounted at the
upper container 56. The common electrode bar 70 and the plurality
water level detecting electrode bars 72 and 74 are vertically
mounted at the supporting member 76 with an insulated state.
[0043] Operation of the water level sensor 54 will be
explained.
[0044] When water is supplied into the hermetic container 50 under
a state that a direct current voltage is applied between the common
electrode bar 70 and the first and second electrode bars 72 and 74,
water is first in contact with the longest common electrode bar 70.
Then, when the first electrode bar 72 is in contact with water as
water is gradually supplied, the common electrode bar 70 and the
first electrode bar 72 are electrically connected to each other
thus to generate a low voltage and thereby to detect the lowest
water level L1. Also, when the second electrode bar 74 is in
contact with water as water is further supplied into the hermetic
container 50, the common electrode bar 70 and the second electrode
bar 74 are electrically connected to each other thus to generate a
high voltage and thereby to detect the highest water level L2.
[0045] FIG. 5 is a block diagram showing a heating method of a
heating apparatus of the washing machine according to the present
invention. As shown, the heating apparatus comprises a temperature
sensor 42 installed at one side of the inner tub for detecting
temperature of the inner tub, a water level sensor 54 installed in
the steam generator 24 for detecting a level of water supplied into
the steam generator 24 step by step, and a controller 80 for
controlling an operation of the water supply valve 40 and the
heater 52 according to a signal applied from the temperature sensor
42 and the water level sensor 54.
[0046] The heating apparatus for heating laundry by steam can be
applied not only the drum washing machine aforementioned as the
preferred embodiment but also any washing machine.
[0047] Operation of the heating apparatus of the washing machine
according to the present invention will be explained as
follows.
[0048] FIG. 6 is a flow chart showing the heating method of the
washing machine according to the present invention.
[0049] First, laundry is put into the inner tub 16 and then a
driving signal of the washing machine is applied, thereby supplying
washing water into the outer tub 14. Then, when a laundry heating
mode is inputted by a user, the controller 80 switches-on the water
supply valve (S10).
[0050] According to this, water is supplied into the steam
generator 24 through the water supply tube 32 (S20).
[0051] Then, it is judged whether a level of water supplied into
the steam generator 24 has reached a first setting level T1 (S3).
That is, when water is supplied into the hermetic container 50 of
the steam generator 24 and thereby the second electrode bar 74 of
the water level sensor 54 is in contact with water, the common
electrode 70 and the second electrode bar 74 are electrically
connected to each other by water thus to generate a voltage. The
generated voltage is detected by the controller 80 and thereby a
water level is judged.
[0052] In said step, if it is judged that the water level has
reached the first setting level T1, water supply is stopped and the
heater 52 is turned on (S40 and S50). That is, the controller 80
switches-off the water supply valve 40 thus to stop water supply
and applies a power source into the heater 52.
[0053] According to this, the water which has been supplied into
the hermetic container 50 is heated by the heater 52 thus to
generate steam, and the steam generated in the hermetic container
50 is supplied into the inner tub 16 through the steam supply tube
34 thus to heat the laundry.
[0054] Then, it is judged whether a water level inside the hermetic
container 50 is lower than a second setting level T2 (S60). That
is, it is judged whether a water level inside the hermetic
container 50 is lower than the lowest water level that the first
electrode bar 72 is not in contact with water.
[0055] In said step, if the water level is judged to be lower than
the second setting level T2, the heater is turned off (S70). Then,
it is judged whether temperature inside the inner tub 16 has
reached a set temperature (S80). That is, the controller 80
compares a set temperature selected by the user with a temperature
inside the inner tub 16 applied from the temperature sensor 42.
[0056] In said step, if the temperature inside the inner tub 16 is
judged to be more than the set temperature, a washing operation is
performed. On the contrary, if the internal temperature of the
inner tub 16 is judged to be lower than the set temperature, water
is supplied into the hermetic container 50 and the above steps are
repeated thus to spray steam into the inner tub 16.
[0057] In the heating apparatus of the washing machine according to
the present invention, the steam generator is provided and the
laundry is heated by spraying steam into the tub, thereby reducing
an entire size of the washing machine, reducing an amount of
washing water, minimizing a consumption electric power, and
reducing washing time.
[0058] Besides, the water level sensor for detecting a level of
water supplied into the steam generator is constituted with the
plurality of electrode bars thus to detect a water level inside the
steam generator more accurately, thereby enhancing a performance of
the heating apparatus.
[0059] As the present invention may be embodied in several forms
without departing from the spirit or essential characteristics
thereof, it should also be understood that the above-described
embodiments are not limited by any of the details of the foregoing
description, unless otherwise specified, but rather should be
construed broadly within its spirit and scope as defined in the
appended claims, and therefore all changes and modifications that
fall within the metes and bounds of the claims, or equivalence of
such metes and bounds are therefore intended to be embraced by the
appended claims.
* * * * *