CN210399646U - Domestic refrigerator with introduced natural cold source - Google Patents
Domestic refrigerator with introduced natural cold source Download PDFInfo
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- CN210399646U CN210399646U CN201920863329.9U CN201920863329U CN210399646U CN 210399646 U CN210399646 U CN 210399646U CN 201920863329 U CN201920863329 U CN 201920863329U CN 210399646 U CN210399646 U CN 210399646U
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Abstract
The utility model discloses an introduce domestic refrigerator of nature cold source aims at providing one kind in the lower environment of outdoor temperature, provides partial cold volume through introducing the nature cold source, reduces the compressor power consumption, reduces the condenser load to reduce the domestic refrigerator of the power consumption of refrigerator. The refrigerating system comprises a refrigerating circulation system and a cold-carrying circulation system, wherein the refrigerating circulation system comprises a compressor, a drying filter, a condenser, a refrigerating end throttling element, a refrigerating end evaporator, a freezing end throttling element, a freezing end evaporator and a gas-liquid separator, the cold-carrying circulation system comprises a liquid pump, an air-cooling type heat exchanger, a first heat exchanger, a second heat exchanger, a first valve, a second valve, a third valve and a fourth valve, and a refrigerant of the refrigerating circulation system and a secondary refrigerant in the cold-carrying circulation system adopt the same circulating working medium. The household refrigerator introduces a natural cold source to provide a certain supercooling degree for a refrigerant in a refrigeration cycle, so that a compressor in a refrigeration system does not need to work fully, and the energy consumption of the compressor is reduced.
Description
Technical Field
The utility model relates to a domestic appliance technical field, more specifically the utility model relates to a domestic refrigerator of introducing natural cold source that says so.
Background
The refrigerator is a common household appliance, the household refrigerator is generally divided into a refrigerating chamber and a freezing chamber according to use requirements, a compressor compresses a refrigerant and then divides the refrigerant into two paths through a condensing coil, one path enters a refrigerating end evaporator through a refrigerating end throttling element, the other path enters a freezing end evaporator through a freezing end throttling element, cold is provided for the refrigerating chamber through the refrigerating end evaporator, and cold is provided for the freezing chamber through the freezing end evaporator. In the refrigerating process, the cold energy required by the refrigerating chamber and the freezing chamber is provided by the electric energy consumed by the compressor, so that the refrigerator has high power consumption and high energy consumption.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the technical defect who exists among the prior art, and provide one kind in the lower environment of outdoor temperature, provide some cold volume through introducing natural cold source, reduce the compressor power consumption, reduce the condenser load to reduce the domestic refrigerator of the power consumption of refrigerator.
For realizing the utility model discloses a technical scheme that the purpose adopted is:
a household refrigerator introducing a natural cold source comprises a refrigeration circulation system and a cold-carrying circulation system, wherein the refrigeration circulation system consists of a compressor, a drying filter, a condenser, a refrigeration end throttling element, a refrigeration end evaporator, a freezing end throttling element, a freezing end evaporator and a gas-liquid separator, the cold-carrying circulation system consists of a liquid pump, an air-cooled heat exchanger, a first heat exchanger, a second heat exchanger, a first valve, a second valve, a third valve and a fourth valve, and a refrigerant of the refrigeration circulation system and a secondary refrigerant in the cold-carrying circulation system adopt the same circulation working medium; outlets of the air-cooled heat exchangers are respectively connected with inlets of the first valve and the second valve, one path of the outlet of the first valve is connected to the inlet end of the freezing end throttling element, the other path of the outlet of the first valve is sequentially connected with the third valve and a refrigerant channel of the first heat exchanger, an outlet of the refrigerant channel of the first heat exchanger is connected to the inlet end of the freezing end throttling element, an outlet of the second valve is connected with the inlet end of the refrigerant channel of the second heat exchanger through the refrigerant channel of the first heat exchanger, and an outlet of the refrigerant channel of the second heat exchanger is connected with the inlet end of the air-cooled heat exchanger through the liquid pump; a fifth valve is arranged on a pipeline between the refrigerating end evaporator and the freezing end evaporator; the outlet end of the freezing end evaporator is connected with the outlet end of the refrigerating end throttling element in parallel, one path of the outlet end of the freezing end evaporator is connected with the inlet end of a refrigerant channel of the second heat exchanger through the fourth valve, and the other path of the outlet end of the freezing end evaporator is connected with the inlet end of the refrigerating end evaporator through the fifth valve.
The exhaust end of the compressor is connected with the inlet of the drying filter through the condenser, the inlet end of the refrigerating end throttling element is provided with a seventh valve, the inlet end of the freezing end throttling element is provided with a stop valve, the outlet of the drying filter is respectively connected with the inlets of the seventh valve, the sixth valve and the third valve and the outlet of the first valve, the outlet of the seventh valve is connected with the inlet of the refrigerating end throttling element, the outlet of the sixth valve is connected with the outlet of the refrigerant channel of the first heat exchanger in parallel and then connected with the inlet of the freezing end throttling element, the outlet of the freezing end throttling element is connected with the inlet of the freezing end evaporator, the outlet of the freezing end evaporator is connected with the outlet of the refrigerating end throttling element in parallel and then respectively connected with the inlets of the fifth valve and the fourth valve, the outlet of the fifth valve is connected with the inlet of the refrigerating end evaporator, and the outlet of the refrigerating end evaporator is connected with the air suction end of the compressor through the gas-liquid separator.
And an eleventh valve is arranged between the outlet end of the refrigerant channel of the second heat exchanger and the inlet of the refrigeration end evaporator.
And a ninth valve is arranged between the outlet of the secondary refrigerant channel of the second heat exchanger and the liquid pump.
And a tenth valve is arranged between the liquid pump and the inlet of the air-cooled heat exchanger.
And an eighth valve is arranged between the gas-liquid separator and the suction end of the compressor.
The first heat exchanger tube plate heat exchanger.
The second heat exchanger is a tubular heat exchanger.
The refrigerating end throttling element and the freezing end throttling element adopt capillary tubes, and the designed length of the refrigerating end throttling element is smaller than that of the freezing end throttling element.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses an in the domestic refrigerator, when ambient temperature is lower, introduce natural cold source, the secondary refrigerant flows through air-cooled heat exchanger and obtains lower temperature with the external air heat exchange, provides certain subcooling for the refrigerant in the refrigeration cycle, reentrants the freezing end evaporimeter for the compressor need not full load work among the refrigerating system, thereby has reduced the energy consumption of compressor.
2. The utility model discloses an in the domestic refrigerator, when freezing end evaporating temperature was too high can't satisfy cold-stored end evaporating temperature, the coolant through the export of first heat exchanger and freezing end evaporimeter export refrigerant at the heat transfer of second heat exchanger, obtain suitable cold-stored end evaporating temperature, reduced the power consumption of compressor, reduced the condenser load, solved cold-stored end evaporimeter entry supercooling problem, saved the energy consumption, reached energy-conserving purpose.
3. The utility model discloses a domestic refrigerator can switch between single-stage vapor compression formula domestic refrigerator refrigeration cycle and the refrigeration cycle who introduces natural cold source, the energy saving according to service environment temperature's difference.
4. The utility model discloses a domestic refrigerator has solved the extravagant problem of cold volume of freezing end and cold-stored end series connection, avoids the waste of the energy, reaches energy-conserving purpose.
Drawings
Fig. 1 is a schematic diagram of a household refrigerator with a natural cold source according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The utility model discloses the schematic diagram of the domestic refrigerator of introducing natural cold source is shown in figure 1, include the refrigeration cycle system who comprises compressor 9, drier-filter 20, condenser 10, cold-stored end throttle original paper 16, cold-stored end evaporimeter 6, cold-stored end throttle original paper 11, cold-stored end evaporimeter 3 and vapour and liquid separator 7 and the cold circulation system of carrying that comprises liquid pump 14, air-cooled heat exchanger 1, first heat exchanger 15, second heat exchanger 4, first valve 21, second valve 2, third valve 13 and fourth valve 23, refrigeration cycle system's refrigerant with the secondary refrigerant in the cold circulation system of carrying adopts the same cycle media. The outlet of the air-cooled heat exchanger 1 is respectively connected with the inlets of the first valve 21 and the second valve 2, one path of the outlet of the first valve 21 is connected with the inlet end of the freezing end throttling element 11, the other path of the outlet of the first valve is sequentially connected with the third valve 13 and the refrigerant channel of the first heat exchanger 15, the refrigerant channel outlet of the first heat exchanger 15 is connected with the inlet end of the freezing end throttling element 11, the outlet of the second valve 2 is connected with the inlet end of the secondary refrigerant channel of the second heat exchanger 4 through the secondary refrigerant channel of the first heat exchanger 15, and the outlet end of the secondary refrigerant channel of the second heat exchanger 4 is connected with the inlet end of the air-cooled heat exchanger 1 through the liquid pump 14. A fifth valve 5 is arranged on a pipeline between the inlet of the refrigerating end evaporator 6 and the outlet of the freezing end evaporator; the outlet end of the freezing end evaporator 3 is connected in parallel with the outlet end of the refrigerating end throttling element 16, one path of the outlet end is connected with the inlet end of the refrigerant channel of the second heat exchanger 4 through the fourth valve 23, and the other path of the outlet end is connected with the inlet end of the refrigerating end evaporator 6 through the fifth valve 5. The air-cooled heat exchanger 1 is used for heat exchange between secondary refrigerant and a natural cold source in the environment. The first heat exchanger 15 is used for preventing the throttling pressure of the throttling element 11 at the freezing end from being too low to influence the outlet flow of the throttling element at the freezing end when the temperature of a natural air cold source is lower than minus 30 ℃, so that the liquid supply of the evaporator at the freezing end is insufficient. The first heat exchanger 4 is used for absorbing heat through the first heat exchanger 4 and entering the cold storage end evaporator 6 for evaporation when the outlet temperature of the freezing end evaporator is too low.
Wherein, the refrigeration cycle system can adopt the existing connection mode. In this embodiment, the exhaust end of the compressor 1 is connected to the inlet of the dry filter 20 through the condenser 10, the seventh valve 17 is installed at the inlet end of the refrigerating end throttling element 16, the sixth valve 12 is installed at the inlet end of the refrigerating end throttling element 11, the outlet of the dry filter 20 is connected to the inlets of the seventh valve 17, the sixth valve 12, the third valve 13 and the outlet of the first valve 21, respectively, the outlet of the seventh valve 17 is connected to the inlet of the refrigerating end throttling element 16, the outlet of the sixth valve 12 is connected to the outlet of the refrigerant passage of the first heat exchanger 15 in parallel and then connected to the inlet of the refrigerating end throttling element 11, the outlet of the refrigerating end throttling element 11 is connected to the inlet of the refrigerating end evaporator 3, the outlet of the refrigerating end evaporator 3 is connected to the outlet of the refrigerating end throttling element 16 in parallel and then connected to the inlets of the fifth valve 5 and the fourth valve 23, respectively, the outlet of the fifth valve 5 is connected with the inlet of the refrigeration end evaporator 6, and the outlet of the refrigeration end evaporator 6 is connected with the air suction end of the compressor 9 through the gas-liquid separator 7.
For the convenience of control, an eleventh valve 19 is installed between the outlet end of the refrigerant passage of the second heat exchanger 4 and the inlet of the refrigerating-end evaporator 6. A ninth valve 22 is installed between the outlet of the coolant passage of the second heat exchanger 4 and the liquid pump 14. A tenth valve 18 is installed between the liquid pump 14 and the inlet of the air-cooled heat exchanger 1. An eighth valve 8 is arranged between the gas-liquid separator 7 and the suction end of the compressor 9.
The refrigerating end throttling element 16 and the freezing end throttling element 11 both adopt capillary tubes.
The utility model discloses a domestic refrigerator selects different mode according to natural environment temperature when using: the working mode I is adopted when the air temperature of the natural environment is above 5 ℃; and when the temperature of the natural environment air is between minus 30 ℃ and 5 ℃, the second working mode is adopted, and when the temperature of the natural environment air is below minus 30 ℃, the third working mode is adopted.
When the temperature of the natural air source is above 5 ℃, the working mode is one: close ninth valve 22, tenth valve 18, first valve 21, second valve 2, third valve 13, second valve 23, eleventh valve 19, other valves are opened, liquid pump 14 and air-cooled heat exchanger 1 are out of work, the utility model discloses a refrigerating system of domestic refrigerator is single-stage vapor compression formula refrigerating system. A refrigerant is sucked and compressed by a compressor 9, the refrigerant is compressed by the compressor and then enters a condenser 10 for condensation and heat release, the refrigerant after heat release enters a drying filter 20 for drying and filtration, and one path of the filtered refrigerant enters a refrigerating end throttling element 16 for throttling through a seventh valve 17; the other path enters a throttling element 11 at the freezing end through a sixth valve 12 for throttling and pressure reduction, and then enters the evaporator 3 at the freezing end. The refrigerant flowing out of the refrigerating end throttling element 16 is mixed with the refrigerant flowing out of the freezing end evaporator 3 to reach the medium pressure and the proper evaporation temperature, and then enters the refrigerating end evaporator 6. After the refrigerant is evaporated in the refrigerating end evaporator 6 to finish the refrigerating refrigeration of the refrigerator, the refrigerant naturally overheats through the gas-liquid separator 7 and then enters the compressor 9 again to be compressed, and the refrigeration cycle is finished.
When the temperature of the natural air source is-30 ℃ to 5 ℃, the utility model is the second working mode, and the household refrigerator is a refrigeration cycle system for introducing a natural cold source. The ninth valve 22, the tenth valve 18, the first valve 21, the second valve 2, the seventh valve 17, the sixth valve 12, the fifth valve 5 and the eighth valve 8 are opened, other valves are closed, the liquid pump 14 starts to work, the secondary refrigerant enters the air-cooled heat exchanger 1 through the liquid pump 14, the secondary refrigerant is cooled by a natural cold source, one path of the secondary refrigerant is mixed with the refrigerant of the freezing evaporation branch after passing through the first valve 21, the refrigerant enters the freezing chamber evaporator 3 to be refrigerated after reaching the designed evaporation temperature, the other path of the secondary refrigerant enters the first heat exchanger 15, the second heat exchanger 4 and the ninth valve 22 through the second valve 2 and returns to the liquid pump 14, and the secondary cooling cycle is completed. High-pressure steam discharged by the compressor 9 enters the condenser 10 for condensation, heat is released by condensation, a refrigerant after heat release enters the drying filter 20 for drying and filtering, and one path of the filtered refrigerant enters the refrigerating end throttling element 16 for throttling through the seventh valve 17; the other path is mixed with the coolant from the first valve 21 through a sixth valve 12 and enters the refrigerating end throttling element 11 for throttling and depressurizing. The refrigerant flowing out of the refrigerating end throttling element 16 is mixed with the refrigerant flowing out of the freezing end evaporator 3 to reach the medium pressure and the proper evaporation temperature, and then enters the refrigerating end evaporator 6. After the refrigerant is evaporated in the refrigerating end evaporator 6 to finish the refrigerating refrigeration of the refrigerator, the refrigerant naturally overheats through the gas-liquid separator 7 and then enters the compressor 9 again to be compressed, and the refrigeration cycle is finished.
When the temperature of the natural air is lower than minus 30 ℃, the domestic refrigerator is a refrigeration system for introducing a natural cold source. The ninth valve 22, the tenth valve 18, the first valve 21, the second valve 2, the seventh valve 17, the sixth valve 12, the third valve 13, the fifth valve 5 and the eighth valve 8 are opened, other valves are closed, the liquid pump 14 starts to work, the secondary refrigerant enters the air-cooled heat exchanger 1 through the liquid pump 14, the secondary refrigerant is cooled by a natural cold source, and then, one path of secondary refrigerant passes through the first valve 21 and then flows through the sixth valve 12 to enter a freezing end branch; the other path of refrigerant enters a first heat exchanger 15 through a third valve 13 for cooling, is mixed with the refrigerant of the freezing end branch after being cooled by the first heat exchanger 15, enters a freezing end throttling element 11 for throttling, and enters a freezing chamber evaporator 3 for refrigeration after reaching the designed evaporation temperature; the other path enters the first heat exchanger 15, the second heat exchanger 4 and the ninth valve 22 through the second valve 2 and returns to the liquid pump 14, and the cold carrying cycle is completed. High-pressure steam discharged by the compressor 9 enters the condenser 10 for condensation, heat is released by condensation, a refrigerant after heat release enters the drying filter 20 for drying and filtering, and one path of the filtered refrigerant enters the refrigerating end throttling element 16 for throttling through the seventh valve 17; the other path is mixed with the coolant from the first valve 21 through a sixth valve 12 and enters the refrigerating end throttling element 11 for throttling and depressurizing. The refrigerant flowing out of the refrigerating end throttling element 16 is mixed with the refrigerant flowing out of the freezing end evaporator 3, reaches the medium pressure and the proper evaporation temperature and then enters the refrigerating end evaporator 6. After the refrigerant is evaporated in the refrigerating end evaporator 6 to finish the refrigerating refrigeration of the refrigerator, the refrigerant naturally overheats through the gas-liquid separator 7 and then enters the compressor 9 again to be compressed, and the refrigeration cycle is finished.
When the temperature of the refrigerant at the outlet of the freezing end evaporator 3 is lower than that of the refrigerating end evaporator 6, the eleventh valve 19 and the fourth valve 23 are opened, a part of the refrigerant flowing out of the outlet of the freezing end evaporator 3 enters a refrigerant channel of the second heat exchanger 4 through the fourth valve 23, and in the second heat exchanger 4, the refrigerant in the refrigerant channel exchanges heat with the secondary refrigerant in the secondary refrigerant channel; after passing through the fifth valve 5, the other part of the refrigerant is mixed with the refrigerant flowing out of the refrigerant channel of the second heat exchanger 4 and passing through the eleventh valve 19, and then the mixed refrigerant enters the refrigerating end evaporator 6 for evaporation and refrigeration, and meanwhile, when the load of the refrigerating end is large, the refrigerant enters the refrigerating end evaporator 6 and is completely in a vapor state, so that the refrigeration effect is lost. The refrigerant flowing out of the outlet of the refrigeration end evaporator 3 passes through the gas-liquid separator 7 and the eighth valve 8 and then enters the compressor 9 to complete the circulation.
The air is the most common external natural cold source, and the secondary refrigerant is cooled by the heat exchanger to be used as a part of the cold source of the household refrigerator when the outdoor temperature is low, so that the power consumption of the compressor can be effectively saved on the premise of not influencing the refrigeration effect of the system, and the performance coefficient of the household refrigerator is improved. The system is proved to have higher feasibility and innovativeness through calculation analysis and system design, an outdoor natural cold source can be fully utilized in a cold region in winter, the performance coefficient of the refrigeration system can be improved by about 15% after the natural cold source is added, the daily power consumption is saved by about 33%, the energy utilization efficiency is effectively improved, and the working load of the compressor is reduced. The system is matched with the construction of a novel energy-saving building, and has wider application prospect.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A household refrigerator introducing a natural cold source is characterized by comprising a refrigeration circulating system and a cold carrying circulating system, wherein the refrigeration circulating system consists of a compressor, a drying filter, a condenser, a refrigeration end throttling element, a refrigeration end evaporator, a freezing end throttling element, a freezing end evaporator and a gas-liquid separator, the cold carrying circulating system consists of a liquid pump, an air cooling type heat exchanger, a first heat exchanger, a second heat exchanger, a first valve, a second valve, a third valve and a fourth valve, and a refrigerant of the refrigeration circulating system and a secondary refrigerant in the cold carrying circulating system adopt the same circulating working medium; outlets of the air-cooled heat exchangers are respectively connected with inlets of the first valve and the second valve, one path of the outlet of the first valve is connected to the inlet end of the freezing end throttling element, the other path of the outlet of the first valve is sequentially connected with the third valve and a refrigerant channel of the first heat exchanger, an outlet of the refrigerant channel of the first heat exchanger is connected to the inlet end of the freezing end throttling element, an outlet of the second valve is connected with the inlet end of the refrigerant channel of the second heat exchanger through the refrigerant channel of the first heat exchanger, and an outlet of the refrigerant channel of the second heat exchanger is connected with the inlet end of the air-cooled heat exchanger through the liquid pump; a fifth valve is arranged on a pipeline between the refrigerating end evaporator and the freezing end evaporator; the outlet end of the freezing end evaporator is connected with the outlet end of the refrigerating end throttling element in parallel, one path of the outlet end of the freezing end evaporator is connected with the inlet end of a refrigerant channel of the second heat exchanger through the fourth valve, and the other path of the outlet end of the freezing end evaporator is connected with the inlet end of the refrigerating end evaporator through the fifth valve.
2. The household refrigerator with the natural cold source introduced as claimed in claim 1, wherein the exhaust end of the compressor is connected to the inlet of the dry filter through the condenser, the inlet of the throttling element at the refrigerating end is installed with a seventh valve, the inlet of the throttling element at the freezing end is installed with a stop valve, the outlet of the dry filter is connected to the inlets of the seventh valve, the sixth valve and the third valve and the outlet of the first valve, respectively, the outlet of the seventh valve is connected to the inlet of the throttling element at the refrigerating end, the outlet of the sixth valve is connected to the inlet of the throttling element at the freezing end after being connected to the outlet of the refrigerant channel of the first heat exchanger in parallel, the outlet of the throttling element at the freezing end is connected to the inlet of the evaporator at the freezing end, the outlet of the evaporator at the freezing end is connected to the outlet of the throttling element at the refrigerating end in parallel and then connected to the inlets of the fifth valve and the fourth valve, respectively, the outlet of the fifth valve is connected with the inlet of the refrigerating end evaporator, and the outlet of the refrigerating end evaporator is connected with the air suction end of the compressor through the gas-liquid separator.
3. The household refrigerator for introducing a natural cold source as claimed in claim 2, wherein an eleventh valve is installed between the outlet end of the refrigerant passage of the second heat exchanger and the inlet of the refrigerating end evaporator.
4. The household refrigerator for introducing a natural cold source as claimed in claim 3, wherein a ninth valve is installed between the outlet of the coolant passage of the second heat exchanger and the liquid pump.
5. The refrigerator for home use introducing a natural cold source as claimed in claim 3, wherein a tenth valve is installed between the liquid pump and the inlet of the air-cooled heat exchanger.
6. The household refrigerator for introducing a natural cold source as claimed in claim 3, wherein an eighth valve is installed between the gas-liquid separator and a suction end of the compressor.
7. The household refrigerator incorporating a natural cold source of claim 3 wherein the first heat exchanger is a tube and plate heat exchanger.
8. The refrigerator for home use introducing a natural cold source as claimed in claim 3, wherein the second heat exchanger is a tube type heat exchanger.
9. The household refrigerator for introducing a natural cold source as claimed in claim 3, wherein the refrigerating end throttling element and the freezing end throttling element are capillary tubes, and the design length of the refrigerating end throttling element is smaller than that of the freezing end throttling element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920863329.9U CN210399646U (en) | 2019-06-10 | 2019-06-10 | Domestic refrigerator with introduced natural cold source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920863329.9U CN210399646U (en) | 2019-06-10 | 2019-06-10 | Domestic refrigerator with introduced natural cold source |
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| Publication Number | Publication Date |
|---|---|
| CN210399646U true CN210399646U (en) | 2020-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920863329.9U Expired - Fee Related CN210399646U (en) | 2019-06-10 | 2019-06-10 | Domestic refrigerator with introduced natural cold source |
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| Country | Link |
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| CN (1) | CN210399646U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145914A (en) * | 2019-06-10 | 2019-08-20 | 天津商业大学 | A kind of domestic refrigerator introducing natural cooling source |
-
2019
- 2019-06-10 CN CN201920863329.9U patent/CN210399646U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145914A (en) * | 2019-06-10 | 2019-08-20 | 天津商业大学 | A kind of domestic refrigerator introducing natural cooling source |
| CN110145914B (en) * | 2019-06-10 | 2024-08-09 | 天津商业大学 | Domestic refrigerator with natural cold source |
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Granted publication date: 20200424 Termination date: 20210610 |