U.S. patent application number 14/003577 was filed with the patent office on 2014-02-27 for refrigerator.
This patent application is currently assigned to BSH Bosch und Siemens Hausgerate GmbH. The applicant listed for this patent is Thomas Bischofberger, Cuma Dulger, Panagiotis Fotiadis, Hans Ihle. Invention is credited to Thomas Bischofberger, Cuma Dulger, Panagiotis Fotiadis, Hans Ihle.
Application Number | 20140053593 14/003577 |
Document ID | / |
Family ID | 45811507 |
Filed Date | 2014-02-27 |
United States Patent
Application |
20140053593 |
Kind Code |
A1 |
Ihle; Hans ; et al. |
February 27, 2014 |
REFRIGERATOR
Abstract
In a refrigerator having a thermally insulating housing which
surrounds a storage chamber and having a refrigerant circuit which
comprises a compressor, a condenser, a restrictor and an evaporator
which cools the storage chamber, the restrictor is arranged at
least partially on a side wall of the housing.
Inventors: |
Ihle; Hans; (Giengen,
DE) ; Bischofberger; Thomas; (Kissleg, DE) ;
Dulger; Cuma; (Medlingen, DE) ; Fotiadis;
Panagiotis; (Giengen, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ihle; Hans
Bischofberger; Thomas
Dulger; Cuma
Fotiadis; Panagiotis |
Giengen
Kissleg
Medlingen
Giengen |
|
DE
DE
DE
DE |
|
|
Assignee: |
BSH Bosch und Siemens Hausgerate
GmbH
Munich
DE
|
Family ID: |
45811507 |
Appl. No.: |
14/003577 |
Filed: |
March 9, 2012 |
PCT Filed: |
March 9, 2012 |
PCT NO: |
PCT/EP12/54059 |
371 Date: |
November 7, 2013 |
Current U.S.
Class: |
62/452 |
Current CPC
Class: |
F25B 2500/01 20130101;
F25D 23/006 20130101; F25D 11/00 20130101; F25B 41/067
20130101 |
Class at
Publication: |
62/452 |
International
Class: |
F25D 11/00 20060101
F25D011/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 28, 2011 |
DE |
10 2011 006 260.2 |
Claims
1. A refrigerator, in particular a household refrigerator, having a
thermally insulating housing (2, 3), which encloses a storage
chamber (4), and a refrigerant circuit, which comprises a
compressor (9), a condenser (10), a restrictor (12, 17) and an
evaporator (18), which cools the storage chamber (4), characterized
in that the restrictor (12, 17) is disposed at least partially on a
side wall of the housing (2).
2. The refrigerator as claimed in claim 1, characterized in that
the restrictor (12, 17) is disposed on the side wall between an
outer skin (6) and an insulating layer of the side wall.
3. The refrigerator as claimed in claim 2, characterized in that
the restrictor (12, 17) is bonded to the outer skin (6), in
particular by adhesive tape (14).
4. The refrigerator as claimed in one of the preceding claims,
characterized in that the restrictor (12, 17) comprises an upstream
segment (12) and a downstream segment (17) and the part of the
restrictor disposed on the side wall is the upstream segment
(12).
5. The refrigerator as claimed in claim 4, characterized in that
the downstream segment of the restrictor (12, 17) is positioned in
a suction tube (19) leading from the evaporator (18) to the
compressor (8).
6. The refrigerator as claimed in claim 4 or 5, characterized in
that the downstream segment (17) has a smaller cross section than
the upstream segment (12).
7. The refrigerator as claimed in one of claims 4 to 6,
characterized in that the upstream segment (12) has a free diameter
of less than 1 mm.
8. The refrigerator as claimed in one of claims 4 to 7,
characterized in that the upstream segment (12) has a length of at
least 1 m.
9. The refrigerator as claimed in one of claims 4 to 8,
characterized in that the downstream (17) segment and the upstream
segment (12) are joined to one another outside an insulating layer
of the side wall.
Description
[0001] The present invention relates to a refrigerator, in
particular a household refrigerator, having a thermally insulating
housing, which encloses a storage chamber for items to be chilled,
and a refrigerant circuit, which comprises a compressor, a
condenser, a restrictor and an evaporator, which cools the storage
chamber. The action of such a known refrigerator is based on the
fact that the compressor sucks refrigerant in vapor form out of the
evaporator and feeds the refrigerant, when it has been heated
adiabatically by compression, to the condenser, where it condenses
while emitting heat. The liquid refrigerant thus obtained
decompresses as it passes through the restrictor and returns to the
evaporator adiabatically cooled.
[0002] The extent of adiabatic cooling is a function of the
pressure difference passed through between condenser and
evaporator. The warmer the refrigerant at the outlet of the
condenser, the warmer it also is when it reaches the evaporator
after decompressing. Theoretically it is possible to approximate
the temperature of the refrigerant at the outlet of the condenser
to anywhere near the temperature of the environment, to which the
condenser emits its heat but the required dimensions of the
condenser have to be greater, the smaller this temperature
difference is to be. The cooling that can be achieved at the
condenser is also limited by parasitic heat transfer between warm,
upstream regions of the condenser and cooler downstream regions.
When air, which has already been heated in upstream regions of the
condenser, flows around a downstream region of the condenser, said
downstream region can no longer cool the refrigerant to below the
temperature of said air.
[0003] Refrigerators are known, in which a frame heater is provided
to prevent condensation on the housing in the vicinity of a seal
positioned between carcass and door of the housing. Such a frame
heater comprises a tube, which is inserted into the refrigerant
circuit between compressor and condenser or downstream of the
condenser, in order to heat the surfaces of the housing that are
susceptible to condensation to above dew point with the compression
heat of the refrigerant. As the susceptibility to condensation
stems from the thermal coupling of said surfaces to the cooled
storage chamber, the heat released by the frame heater ultimately
also flows into the storage chamber to a significant extent,
thereby having a detrimental effect on the energy efficiency of the
refrigerator.
[0004] The object of the present invention is to improve the energy
efficiency of a refrigerator, in particular a household
appliance.
[0005] The object is achieved in that with a refrigerator of the
type defined in the introduction the restrictor is disposed at
least partially on a side wall of the housing. Because of its small
free cross section compared with other regions of the refrigerant
circuit, the restrictor contributes little to the volume of the
refrigerant circuit and therefore does not increase the quantity of
refrigerant required to operate the refrigerant circuit to any
appreciable degree. Being disposed on the side wall, the restrictor
is protected from waste heat, which is released by the condenser,
which is generally disposed on the rear of the appliance. The side
wall is therefore a relatively cool region of the refrigerator
housing and allows efficient additional cooling of the refrigerant
circulating through the restrictor.
[0006] The restrictor is preferably disposed in the side wall
between an outer skin and an insulating layer of the same in such a
manner that it is protected and not visible from the outside. In
order to be able to absorb and pass on the heat from the restrictor
quickly, the outer skin of the side wall is preferably
metallic.
[0007] The restrictor is preferably bonded to the outer skin, to
ensure that it remains in heat-conducting contact with the outer
skin when the insulating layer is applied during assembly of the
refrigerator. The insulating layer is preferably produced in the
technically standard manner by allowing synthetic resin foam to
expand in a hollow space in the housing delimited by the outer
skin.
[0008] Fast and simple bonding of the restrictor and outer skin can
be achieved with the aid of adhesive tape.
[0009] In order to prevent heat being introduced into the
evaporator by way of the restrictor, preferably only an upstream
segment of the restrictor is disposed on the side wall.
[0010] A downstream segment of the restrictor can be positioned in
the known manner instead in a suction tube leading from the
evaporator to the compressor.
[0011] In order to keep the pressure drop in the refrigerant small,
at least in the upstream segment of the restrictor, this latter
preferably has a larger cross section than the downstream segment.
As this upstream segment should not increase the volume of the
refrigerant circuit significantly, it is preferable for the
upstream segment to have a free diameter of less than 1
millimeter.
[0012] In order to allow efficient cooling of the refrigerant
between its exit from the condenser and entry into the evaporator,
the upstream segment preferably has a length of at least 1 meter.
In practice the length of the upstream segment will be up to 2
meters in a household refrigerator of standard size.
[0013] For assembly of the refrigerator it is expedient if the
downstream segment and the upstream segment of the condenser are
joined to one another outside an insulating layer of the side
wall.
[0014] The refrigerant circuit preferably has a dryer, the
refrigerant supply line of which is connected to the upstream end
of the restrictor on the side wall for flow purposes.
[0015] Further features and advantages of the invention will emerge
from the description which follows of exemplary embodiments with
reference to the accompanying figures, in which:
[0016] FIG. 1 shows a perspective view of an inventive household
refrigerator from the front; FIG. 2 shows a perspective view of the
refrigerator from the rear; FIG. 3 shows a plan view of a section
of sheet with a restrictor segment fastened thereto, which forms an
outer skin of a side wall of the refrigerator; and
[0017] FIG. 4 shows a diagram of the refrigerant circuit of the
refrigerator.
[0018] FIGS. 1 and 2 show perspective views of a counter-height
household refrigerator 1. A thermally insulating housing of the
appliance is made up of an essentially cuboid carcass 2 and a door
3, which together delimit a storage chamber 4. The carcass 2 has a
structure that is known per se, with a plastic deep-drawn inner
container 5, an outer skin joined together from a number of
elements and a polyurethane foam insulating layer filling an
intermediate space between the inner container 5 and the outer
skin. The elements of the outer skin include two sheet sections 6,
which extend in each instance over a side wall of the carcass 2 and
are connected to the inner container 5 at a front frame 7 of the
carcass 2 facing the door 3.
[0019] A machine chamber 8 is cut out at the rear of the carcass 2
close to the bottom and holds a refrigerant compressor 9. A
condenser 10 is connected to a pressure connector of the compressor
9. The condenser 10 is shown in FIG. 2 as a wire tube heat
exchanger mounted on a rear wall of the carcass 2 above the machine
chamber 8 but other models of the condenser 10, in particular as a
compact finned tube heat exchanger also accommodated in the machine
chamber 8 and force-cooled by a fan, are also possible. A
downstream connector of the condenser 10 is connected by way of a
sleeve 11 to a restrictor tube 12, which extends in a looped manner
on the inside of one of the sheet sections 6 facing the insulating
layer.
[0020] The sleeves 11, 16 allow the appliance 1 to be assembled, in
that, before the sheet sections 6 are joined to the inner
container, the restrictor 12 is fastened to one of the sheet
sections 6, the carcass 2 is joined together so that the ends of
the restrictor 12 are exposed in the machine chamber 8 and the
carcass is then foamed and finally the restrictor 12 is inserted
into the refrigerant circuit with the aid of the sleeves 11,
16.
[0021] FIG. 3 shows a perspective view of the inside of the sheet
section 6 with the restrictor tube 12. The section 6 comprises a
flat central plate 13, which is provided to form the outer skin of
a side wall of the carcass 2 and to which the restrictor tube 12 is
fastened with the aid of adhesive tape strips 14. Webs 15 angled
away from the central plate 13 extend in the finished appliance 1
to its front frame 7 or its rear and are connected there to the
inner container 5 or a rear wall plate (not shown) in a foam-tight
manner.
[0022] Again with reference to FIG. 1 a second sleeve 16 disposed
in the machine chamber 8 connects the restrictor tube 12 to a
second, narrower restrictor tube 17, which traverses the insulating
layer of the carcass 2 to ensure that the evaporator 18 is disposed
in close thermal contact with the storage chamber 4. As shown
schematically in FIG. 4, the restrictor tube 17 passes directly
along the surface of a suction tube 19, which passes from the
evaporator 18 to the compressor 9, or within said suction tube
19.
[0023] Because a tube with a small internal diameter, typically
approx 0.8 millimeters, is used for the restrictor tube 12, the
volume of the refrigerant circuit as a whole changes
little--despite the restrictor tube 12 being typically 1 to 2
meters long--compared with a conventional refrigerant circuit of a
refrigerator of the same size and therefore the quantity of
circulating refrigerant required for efficient operation also
changes little. As the restrictor tube 12 runs along the central
plate 13 at a distance from the web 15 connected to the inner
container 5, the flow of heat from the restrictor tube 12 to the
storage chamber 4 by way of the connection between sheet section 6
and inner container 5 is negligible. The restrictor tube 12 is
shielded from heat emitted from the condenser 10 by its spatial
distance from the condenser 10. Therefore it is possible to achieve
more efficient cooling of the refrigerant with the restrictor tube
12 than by enlarging the condenser 10 by the volume of the
restrictor tube 12.
[0024] The appliance 1 is preferably positioned in such a manner
that the side wall containing the restrictor tube 12 is exposed so
that heat emitted from the restrictor tube 12 can be passed quickly
to the environment. The invention can however also be used--if only
with little scope--in a refrigerator with a concealed side wall,
for example a built-in appliance or a counter-height appliance
flanked at the sides by other objects. The sheet section 6 here
operates as a thermal storage unit, which absorbs heat from the
restrictor tube 12 while the compressor 9 is operational and drives
refrigerant circulation. In a subsequent stoppage phase of the
compressor the heat of the sheet section 6 can also be distributed
to the environment with such a refrigerator.
* * * * *