WO2005093349A1 - A cooling device and a method for improving insulation - Google Patents

A cooling device and a method for improving insulation Download PDF

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Publication number
WO2005093349A1
WO2005093349A1 PCT/IB2005/050964 IB2005050964W WO2005093349A1 WO 2005093349 A1 WO2005093349 A1 WO 2005093349A1 IB 2005050964 W IB2005050964 W IB 2005050964W WO 2005093349 A1 WO2005093349 A1 WO 2005093349A1
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WO
WIPO (PCT)
Prior art keywords
compressor
evacuation
insulation
cooling device
insulation volume
Prior art date
Application number
PCT/IB2005/050964
Other languages
French (fr)
Inventor
Alper F. Soysal
Fatih Ozkadi
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2005093349A1 publication Critical patent/WO2005093349A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/06—Walls
    • F25D23/062—Walls defining a cabinet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2201/00—Insulation
    • F25D2201/10—Insulation with respect to heat
    • F25D2201/14—Insulation with respect to heat using subatmospheric pressure

Definitions

  • This invention relates to a cooling device and a method for improving insulation wherein insulation and cooling performances are improved by evacuating the section where insulation material is placed.
  • the material chosen to seal the insulation area in order to stabilize the vacuum level is costly and at certain time intervals, service intervention is necessary since, inevitably, the vacuum level would increase in time.
  • the vacuum level of the insulation volume closed to the atmosphere is constantly measured and, if the said vacuum level rises beyond a certain limiting value, it is then pulled back below that limiting value by activating a vacuum generating unit connected to the said insulation volume.
  • the vacuum pumps which are used as the vacuum generating unit in dynamic systems take up a considerable space and also increase the cost.
  • the aim of the present invention is the realization of a cooling device and a method for improving insulation wherein the insulating performance is improved by evacuating the section where the insulation material is placed without using a vacuum pump.
  • Fig.l - is a schematic view of a cooling device.
  • FIG.2 - is a schematic view of the cooling and evacuation connections of a compressor in a cooling device.
  • FIG.3 - is a schematic view of the cooling and evacuation connections of a compressor, in another embodiment of the present invention.
  • Cooling device 2. Cooling line 3. Internal body 4. External body 5. Insulation volume 6.
  • the cooling device (1) comprises an evaporator absorbing the thermal energy in the medium to be cooled, a condenser transferring the said thermal energy to the outside environment, a cooling line (2) incorporating such elements as capillary pipes ensuring the expansion of the refrigerant leaving the condenser, an internal body (3), an external body (4), an insulation volume (5) between the internal body (3) and external body (4) filled with a preferably powder based insulation material and evacuated, a compressor (6) whereby the refrigeration cycle is performed and the evacuation of the insulation volume (5) is achieved, one or more valves (7, 207, 307) placed to the suction side of the compressor (6), preferably as close as possible to the compressor (6), and which perform on-off function during the evacuation of the insulation volume (5) and the transfer of the refrigerant coming from the cooling line (2) to the compressor (6), one or more valves (107, 407, 507) placed to the pump side of the compressor (6), preferably as close as possible to the compressor (6), and which perform on-off
  • the compressor (6) the main function of which is refrigeration, is operated for cooling purposes to perform the regular refrigeration cycle and, if the vacuum level inside the insulation volume (5) rises beyond the value desired for a proper insulation, the afore-mentioned compressor (6) is operated for evacuation purposes to evacuate the insulation volume (5) as a result of the instructions given by the control card (13) to the valves (7, 107, 207, 307, 407, 507) at the suction and pump sides, ensuring that insulation is improved without altering the suction side.
  • the cooling device (1) comprises a multi-way solenoid valve (7) at the suction side of the compressor (6), having cooling line (2) and evacuation pipe (8) inlet and outlets and, a multi-way solenoid valve (107) at the pump side of the compressor (6), having coolmg line (2) and discharge pipe (10) inlet and outlets.
  • the suction side of the compressor (6) connected to the refrigeration system to perform its regular cooling function is connected to the insulation volume (5) which is closed to the atmosphere after a desired vacuum level is established and is filled with insulation material, via the evacuation pipe (8).
  • the pump side of the compressor (6) is connected to the discharge pipe (10) in order to have access to the atmosphere when necessary.
  • the cooling device (1) starts to operate, by opening the cooling line (2) inlets and outlets of the valves (7, 107), refrigeration fluid is allowed to circulate inside the system. Meanwhile, the evacuation pipe (8) and discharge pipe (10) inlet and outlets of the valves (7, 107) are closed.
  • the pressure sensor (12) detects that the pressure inside the insulation volume (5) rises beyond the predetermined value, by means of the control card (13) it is achieved that the cooling line (2) inlets and outlets of the valves (7, 107) are closed and that the compressor (6) turns on if it is not already operating.
  • the compressor (6) starts to evacuate the evacuation pipe (8). After the pressure value of the evacuation pipe (8) reaches the vacuum level inside the insulation volume (5), evacuation of the insulation volume (5) starts by opening the evacuation pipe (8) and discharge pipe (10) inlet and outlets of the valves (7, 107) and, the air evacuated is discharged to the atmosphere.
  • Evacuation process is finished as the vacuum level of the insulation volume (5) reaches the desired value or, the temperature level of the interior of the coolmg device (1) approaches the temperature where the thermostat (11) sends start signal to the compressor (6).
  • the evacuation pipe (8) inlet of the valve (7) at the suction side of the compressor (6) is closed and then, the compressor (6) keeps operating, evacuating itself.
  • the discharge pipe (10) outlet of the valve (107) at the pump side of the compressor (6) is closed and then, it is accomplished that the compressor (6) operates again for cooling purposes by opening the cooling line (2) inlets and outlets of the valves (7, 107).
  • the coolmg device (1) incorporates, at the suction side of the compressor (6), a one-way solenoid valve (207) positioned on the cooling line (2), a one-way solenoid valve (307) positioned on the evacuation pipe (8), and at the pump side of the compressor (6), a one-way solenoid valve (407) positioned on the cooling line (2) and a one-way solenoid valve (507) positioned on the discharge pipe (10).
  • a one-way solenoid valve positioned on the cooling line (2)
  • a one-way solenoid valve positioned on the cooling line (2)
  • a one-way solenoid valve (507) positioned on the discharge pipe (10).
  • valve (307) on the evacuation pipe (8) and the valve (507) on the discharge pipe (10) are closed.
  • the pressure sensor (12) detects that the pressure inside the insulation volume (5) rises beyond the predetermined value, by means of the control card (13) it is achieved that the valves (207, 407) on the cooling line (2) are closed and that the compressor (6) turns on if it is not already operating.
  • the compressor (6) starts to evacuate the evacuation pipe (8).
  • evacuation of the insulation volume (5) starts by opening the valve (307) on the evacuation pipe (8).
  • the valve (507) on the discharge pipe (10) opens so that the air evacuated is discharged to the atmosphere.
  • Evacuation process is finished as the vacuum level of the insulation volume (5) reaches the desired value or, the temperature level of the interior of the cooling device (1) approaches the temperature where the thermostat (11) sends start signal to the compressor (6).
  • the valve (307) on the evacuation pipe (8) is closed and then, the compressor (6) keeps operating, evacuating itself.
  • the valve (507) on the discharge pipe (10) is closed and then, it is accomplished that the compressor (6) operates again for cooling purposes by opening the valves (207, 407) on the cooling line (2).
  • cooling devices (1) comprising two different compressors (6), preferably with different capacities, and two different cooling lines (2)

Abstract

This invention relates to a cooling device (1) comprising an insulation volume (5), preferably filled with a powder based insulation material, between the internal (3) and external body (4) plastics, and to a method for improving insulation wherein the insulation performance is improved by evacuating the mentioned insulation volume (5).

Description

Description A COOLING DEVICE AND A METHOD FOR IMPROVING INSULATION
[001] This invention relates to a cooling device and a method for improving insulation wherein insulation and cooling performances are improved by evacuating the section where insulation material is placed.
[002] In vacuum insulation systems used in cooling devices, after the insulation material, open cell polyurethanes or powder based materials such as Kieselguhr, Fumed Silica, is filled into the insulation volume between the inner and outer shells of the walls enclosing the cabinet, the insulation volume is closed to the atmosphere, vacuum tight, via evacuation. There are two different types of vacuum insulation systems, static and dynamic. In static vacuum insulation systems, the shells enclosing the insulation volume after it is closed to the atmosphere by evacuation, are manufactured from a material such that the vacuum level is kept at a low value or from a multiple-layered material and, if the mentioned vacuum level increases in time, it is set to a desired value by interfering the system. In static systems, the material chosen to seal the insulation area in order to stabilize the vacuum level is costly and at certain time intervals, service intervention is necessary since, inevitably, the vacuum level would increase in time. As for the dynamic vacuum insulation systems, the vacuum level of the insulation volume closed to the atmosphere is constantly measured and, if the said vacuum level rises beyond a certain limiting value, it is then pulled back below that limiting value by activating a vacuum generating unit connected to the said insulation volume. The vacuum pumps which are used as the vacuum generating unit in dynamic systems take up a considerable space and also increase the cost.
[003] In the European Patent Application EP 1353135, a description is given of an application wherein the cabinet insulation volume with plastic outside and inside, filled with porous insulation material, is connected to a gas absorber with a heater around it and is filled with gas adsorbent, by means of a valve. After the cooling device incorporating the said cabinet is operated, the state of the insulation volume is determined considering the heat transfer coefficient and / or the pressure of the insulation material detected by means of a sensor or, the temperature change inside the cabinet or, the compressor operating frequency, and accordingly it is ensured that the automatic valve is opened in order to perform evacuation by means of the gas adsorbent.
[004] In the European Patent Application EP 1335171, a description is given of an application wherein evacuation of the insulation volume is achieved by means of a vacuum pump and, in order to facilitate the evacuation of the insulation volume conduits with diameters 3 - 10 mm are formed on the insulation material wherein all conduits join together at the center portion of the rear wall of the cabinet.
[005] In the United States Patent Document US 6158233, a description is given of an embodiment wherein a permanent vacuum pump is utilized to evacuate the system while foam, powder or fibrous materials are placed into the insulation volume with plastic inside and outside.
[006] In the European Patent Document EP 0587546, a description is given of an embodiment wherein a permanent vacuum pump is utilized to evacuate the system while foam or powder materials are placed into the insulation volume with plastic inside and outside. The operating periods of the vacuum pump and the compressor are regulated by a control unit to which a pressure sensor and a thermostat are connected.
[007] In the European Patent Application EP 1338794, a description is given of a vacuum pump used for insulated walls of a cooling device, the performance of which is optimized by means of valves wherein a control unit is utilized to regulate the operating period thereof.
[008] The aim of the present invention is the realization of a cooling device and a method for improving insulation wherein the insulating performance is improved by evacuating the section where the insulation material is placed without using a vacuum pump.
[009] The cooling device and the method for improving insulation realized in order to attain above mentioned aim of the invention are illustrated in the attached figures where:
[010] Fig.l - is a schematic view of a cooling device.
[011] Fig.2 - is a schematic view of the cooling and evacuation connections of a compressor in a cooling device.
[012] Fig.3 - is a schematic view of the cooling and evacuation connections of a compressor, in another embodiment of the present invention.
[013] The elements illustrated in the figures are numbered individually as follows: 1. Cooling device 2. Cooling line 3. Internal body 4. External body 5. Insulation volume 6. Compressor
[014] 7, 107, 207, 307, 407, 507 - Valve
[015] 8. Evacuation pipe
[016] 9. Filter [017] 10. Discharge pipe
[018] 11. Thermostat
[019] 12. Pressure sensor
[020] 13. Control card
[021] The cooling device (1) comprises an evaporator absorbing the thermal energy in the medium to be cooled, a condenser transferring the said thermal energy to the outside environment, a cooling line (2) incorporating such elements as capillary pipes ensuring the expansion of the refrigerant leaving the condenser, an internal body (3), an external body (4), an insulation volume (5) between the internal body (3) and external body (4) filled with a preferably powder based insulation material and evacuated, a compressor (6) whereby the refrigeration cycle is performed and the evacuation of the insulation volume (5) is achieved, one or more valves (7, 207, 307) placed to the suction side of the compressor (6), preferably as close as possible to the compressor (6), and which perform on-off function during the evacuation of the insulation volume (5) and the transfer of the refrigerant coming from the cooling line (2) to the compressor (6), one or more valves (107, 407, 507) placed to the pump side of the compressor (6), preferably as close as possible to the compressor (6), and which perform on-off function during the discharge of the air evacuated from the insulation volume (5) to the atmosphere and the transfer of the refrigerant coming from the compressor (6) to the cooling line (2), an evacuation pipe (8) whereby the compressor (6) evacuates the insulation volume (5), a filter (9) positioned inside the evacuation pipe (8), used to prevent the insulation material from entering into the compressor (6), a discharge pipe (10) whereby the air that is sucked by the compressor (6) evacuating the insulation volume (5) is discharged to the atmosphere, a thermostat (11) utilized to give the start and stop instructions to the compressor (6) by detecting the temperature of the internal medium, a pressure sensor (12) detecting the pressure value of the insulation volume (5) that is evacuated, and placed into the insulation volume (5), preferably at a farthest point from the section where evacuation is performed and, a control card (13) which controls the operation of the compressor (6) and the valves (7, 107, 207, 307, 407, 507) so as to carry out the refrigeration and evacuation functions properly.
[022] If the temperature level inside the cooling device (1) rises, the compressor (6) the main function of which is refrigeration, is operated for cooling purposes to perform the regular refrigeration cycle and, if the vacuum level inside the insulation volume (5) rises beyond the value desired for a proper insulation, the afore-mentioned compressor (6) is operated for evacuation purposes to evacuate the insulation volume (5) as a result of the instructions given by the control card (13) to the valves (7, 107, 207, 307, 407, 507) at the suction and pump sides, ensuring that insulation is improved without altering the suction side. [023] In one embodiment of the present invention, the cooling device (1) comprises a multi-way solenoid valve (7) at the suction side of the compressor (6), having cooling line (2) and evacuation pipe (8) inlet and outlets and, a multi-way solenoid valve (107) at the pump side of the compressor (6), having coolmg line (2) and discharge pipe (10) inlet and outlets.
[024] According to the mentioned embodiment, in the method for improving insulation of a cooling device (1), the suction side of the compressor (6) connected to the refrigeration system to perform its regular cooling function is connected to the insulation volume (5) which is closed to the atmosphere after a desired vacuum level is established and is filled with insulation material, via the evacuation pipe (8). Whereas the pump side of the compressor (6) is connected to the discharge pipe (10) in order to have access to the atmosphere when necessary. As the cooling device (1) starts to operate, by opening the cooling line (2) inlets and outlets of the valves (7, 107), refrigeration fluid is allowed to circulate inside the system. Meanwhile, the evacuation pipe (8) and discharge pipe (10) inlet and outlets of the valves (7, 107) are closed. In case the pressure sensor (12) detects that the pressure inside the insulation volume (5) rises beyond the predetermined value, by means of the control card (13) it is achieved that the cooling line (2) inlets and outlets of the valves (7, 107) are closed and that the compressor (6) turns on if it is not already operating. The compressor (6) starts to evacuate the evacuation pipe (8). After the pressure value of the evacuation pipe (8) reaches the vacuum level inside the insulation volume (5), evacuation of the insulation volume (5) starts by opening the evacuation pipe (8) and discharge pipe (10) inlet and outlets of the valves (7, 107) and, the air evacuated is discharged to the atmosphere. Evacuation process is finished as the vacuum level of the insulation volume (5) reaches the desired value or, the temperature level of the interior of the coolmg device (1) approaches the temperature where the thermostat (11) sends start signal to the compressor (6). The evacuation pipe (8) inlet of the valve (7) at the suction side of the compressor (6) is closed and then, the compressor (6) keeps operating, evacuating itself. After the compressor (6) sets its internal pressure to a desired level, the discharge pipe (10) outlet of the valve (107) at the pump side of the compressor (6) is closed and then, it is accomplished that the compressor (6) operates again for cooling purposes by opening the cooling line (2) inlets and outlets of the valves (7, 107).
[025] In another embodiment of the present invention, the coolmg device (1) incorporates, at the suction side of the compressor (6), a one-way solenoid valve (207) positioned on the cooling line (2), a one-way solenoid valve (307) positioned on the evacuation pipe (8), and at the pump side of the compressor (6), a one-way solenoid valve (407) positioned on the cooling line (2) and a one-way solenoid valve (507) positioned on the discharge pipe (10). [026] According to the mentioned embodiment, in the method for improving insulation of a coolmg device (1), as the cooling device (1) starts to operate, by opening the valves (207, 407) on the coolmg line (2), refrigeration fluid is allowed to circulate inside the system. Meanwhile, the valve (307) on the evacuation pipe (8) and the valve (507) on the discharge pipe (10) are closed. In case the pressure sensor (12) detects that the pressure inside the insulation volume (5) rises beyond the predetermined value, by means of the control card (13) it is achieved that the valves (207, 407) on the cooling line (2) are closed and that the compressor (6) turns on if it is not already operating. The compressor (6) starts to evacuate the evacuation pipe (8). After the pressure value of the evacuation pipe (8) reaches the vacuum level inside the insulation volume (5), evacuation of the insulation volume (5) starts by opening the valve (307) on the evacuation pipe (8). At the same time, the valve (507) on the discharge pipe (10) opens so that the air evacuated is discharged to the atmosphere. Evacuation process is finished as the vacuum level of the insulation volume (5) reaches the desired value or, the temperature level of the interior of the cooling device (1) approaches the temperature where the thermostat (11) sends start signal to the compressor (6). The valve (307) on the evacuation pipe (8) is closed and then, the compressor (6) keeps operating, evacuating itself. After the compressor (6) sets its internal pressure to a desired level, the valve (507) on the discharge pipe (10) is closed and then, it is accomplished that the compressor (6) operates again for cooling purposes by opening the valves (207, 407) on the cooling line (2).
[027] In another embodiment according to the present invention, in cooling devices (1) comprising two different compressors (6), preferably with different capacities, and two different cooling lines (2), it is achieved that less amount of refrigerant escapes and less amount of air enters into the system by utilizing, preferably, the compressor (6) with smaller capacity for both evacuation and cooling purposes and, that the said compressor (6) is used more frequently for evacuation purposes.
[028] As a consequence of the fact that the compressor (6) performs a function such that insulation is improved by the evacuation of the insulation volume (5) as well as its regular refrigeration function, an additional vacuum pump is not necessary, resulting in the gain of advantages from the aspects of cost and useful space.

Claims

Claims
[001] A cooling device (1) comprising, an evaporator absorbing the thermal energy in the medium to be cooled; a condenser transferring the said thermal energy to the outside environment; a cooling line (2) incorporating such elements as capillary pipe ensuring the expansion of the refrigerant leaving the condenser; an internal body (3); an external body (4); an insulation volume (5) between the internal body (3) and the external body (4) which is evacuated, and characterized by a compressor (6) whereby the refrigeration cycle is performed and the evacuation of the insulation volume (5) is achieved, one or more valves (7, 207, 307) placed to the suction side of the compressor (6) and which perform on-off function during the evacuation of the insulation volume (5) and the transfer of the refrigerant coming from the cooling line (2) to the compressor (6), one or more valves (107, 407, 507) placed to the pump side of the compressor (6) and which perform on-off function during the discharge of the air evacuated from the insulation volume (5) to the atmosphere and the transfer of the refrigerant coming from the compressor (6) to the cooling line (2) and, a control card (13) wherein by controlling the said valves (7, 107, 207, 307, 407, 507), it is achieved that the compressor (6) is operated for evacuation purposes without altering the suction side and that the isolation volume (5) is evacuated.
[002] A cooling device (1) as described in Claim 1, characterized by an evacuation pipe (8) whereby the compressor (6) evacuates the insulation volume (5), a filter (9) positioned inside the evacuation pipe (8), used to prevent the insulation material from entering into the compressor (6) and, a discharge pipe (10) whereby the air that is sucked by the compressor (6) evacuating the insulation volume (5) is discharged to the atmosphere.
[003] A cooling device (1) as described in Claim 1, characterized by a thermostat (11) utilized to give the start and stop instructions to the compressor (6) by detecting the temperature of the internal medium and, a pressure sensor (12) detecting the pressure value of the insulation volume (5) that is evacuated.
[004] A cooling device (1) as described in Claims 1 - 3, characterized by a multi-way solenoid valve (7) at the suction side of the compressor (6), having cooling line (2) and evacuation pipe (8) inlet and outlets and, a multi-way solenoid valve (107) at the pump side of the compressor (6), having cooling line (2) and discharge pipe (10) inlet and outlets.
[005] A method for improving insulation, for a cooling device (1) as described in Claim 4, which method incorporates the following steps : As the cooling device (1) starts to operate, by opening the cooling line (2) inlets and outlets of the valves (7, 107), refrigeration fluid is allowed to circulate inside the system; In case the pressure sensor (12) detects that the pressure inside the insulation volume (5) rises beyond the predetermined value, by means of the control card (13) it is achieved that the coolmg line (2) inlets and outlets of the valves (7, 107) are closed and that the compressor (6) turns on if it is not already operating; The compressor (6) starts to evacuate the evacuation pipe (8); After the pressure value of the evacuation pipe (8) reaches the vacuum level inside the insulation volume (5), evacuation of the insulation volume (5) is started by opening the evacuation pipe (8) and discharge pipe (10) inlet and outlets of the valves (7, 107) and, the air evacuated is discharged to the atmosphere; Evacuation process is finished as the vacuum level of the insulation volume (5) reaches the desired value or, the temperature level of the interior of the cooling device (1) approaches the temperature where the thermostat (11) sends start signal to the compressor (6); The evacuation pipe (8) inlet of the valve (7) at the suction side of the compressor (6) is closed and then, the compressor (6) keeps operating, evacuating itself; After the compressor (6) sets its internal pressure to a desired level, the discharge pipe (10) outlet of the valve (107) at the pump side of the compressor (6) is closed and then, it is accomplished that the compressor (6) operates again for cooling purposes by opening the cooling line (2) inlets and outlets of the valves (7, 107).
[006] A cooling device (1) as described in Claims 1 - 3, characterized by a one-way solenoid valve (207) positioned on the cooling line (2), a one-way solenoid valve (307) positioned on the evacuation pipe (8), at the suction side of the compressor (6), and a one-way solenoid valve (407) positioned on the cooling line (2) and a one-way solenoid valve (507) positioned on the discharge pipe (10), at the pump side of the compressor (6).
[007] A method for improving insulation, for a cooling device (1) as described in Claim 6, incorporates the following steps : As the cooling device (1) starts to operate, by opening the valves (207, 407) on the cooling line (2), refrigeration fluid is allowed to circulate inside the system; In case the pressure sensor (12) detects that the pressure inside the insulation volume (5) rises beyond the predetermined value, by means of the control card (13) it is achieved that the valves (207, 407) on the cooling line (2) are closed and that the compressor (6) turns on if it is not already operating; The compressor (6) starts to evacuate the evacuation pipe (8); After the pressure value of the evacuation pipe (8) reaches the vacuum level inside the insulation volume (5), evacuation of the insulation volume (5) is started by opening the valve (307) on the evacuation pipe (8); At the same time, the valve (507) on the discharge pipe (10) is opened so that the air evacuated is discharged to the atmosphere; Evacuation process is finished as the vacuum level of the insulation volume (5) reaches the desired value or, the temperature level of the interior of the cooling device (1) approaches the temperature where the thermostat (11) sends start signal to the compressor (6); The valve (307) on the evacuation pipe (8) is closed and then, the compressor (6) keeps operating, evacuating itself; After the compressor (6) sets its internal pressure to a desired level, the valve (507) on the discharge pipe (10) is closed and then, it is accomplished that the compressor (6) operates again for cooling purposes by opening the valves (207, 407) on the cooling line (2).
PCT/IB2005/050964 2004-03-22 2005-03-21 A cooling device and a method for improving insulation WO2005093349A1 (en)

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TR2004/00569 2004-03-22

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JP2014163620A (en) * 2013-02-27 2014-09-08 Mitsubishi Electric Corp Refrigerator
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WO2018136054A1 (en) * 2017-01-18 2018-07-26 Whirlpool Corporation Use of rigid or permeable conduits for achieving faster vacuum evacuation time in vacuum insulated structures
US11021905B1 (en) 2019-12-17 2021-06-01 Whirlpool Corporation Insulated door assembly
US11035607B2 (en) 2017-01-18 2021-06-15 Whirlpool Corporation Use of multiple port locations for achieving faster vacuum evacuation time in vacuum insulated structures
US11085690B2 (en) 2017-01-18 2021-08-10 Whirlpool Corporation Increased vacuum port area for achieving faster vacuum evacuation time in vacuum insulated structures

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