CN216159377U - Cascade heat pump capable of improving defrosting efficiency - Google Patents
Cascade heat pump capable of improving defrosting efficiency Download PDFInfo
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- CN216159377U CN216159377U CN202121541571.8U CN202121541571U CN216159377U CN 216159377 U CN216159377 U CN 216159377U CN 202121541571 U CN202121541571 U CN 202121541571U CN 216159377 U CN216159377 U CN 216159377U
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Abstract
The utility model discloses a cascade heat pump capable of improving defrosting efficiency, which comprises a primary system, a secondary system and an intermediate heat exchanger shared by the primary system and the secondary system, wherein the primary system comprises a primary side compressor, a four-way valve, a first heat exchanger, the intermediate heat exchanger and a second heat exchanger, under a defrosting condition, a refrigerant in the compressor flows into the first heat exchanger through the four-way valve, the first heat exchanger is communicated with the intermediate heat exchanger through a one-way valve assembly, the refrigerant flows into the intermediate heat exchanger through the one-way valve assembly after flowing through the first heat exchanger, the refrigerant enters the second heat exchanger for heat exchange after flowing through the intermediate heat exchanger, and the refrigerant after heat exchange returns to the compressor through the four-way valve. According to the utility model, the second heat exchanger is additionally arranged in the primary system, so that the flow direction of the refrigerant in the intermediate heat exchanger during defrosting is changed, and the refrigerant is directly evaporated through the second heat exchanger during defrosting, so that the defrosting efficiency can be effectively improved.
Description
Technical Field
The utility model relates to the technical field of heat pumps, in particular to a cascade heat pump capable of improving defrosting efficiency.
Background
The secondary system can be closed when the existing cascade heat pump system defrosts, the primary system is started, the defrosting of the whole system is realized by reversing through a four-way valve, but the intermediate heat exchanger of the system is used as an evaporation end when the defrosting system defrosts, a refrigerant can flow into the intermediate heat exchanger from the output end of the intermediate heat exchanger and flow out from the input end of the intermediate heat exchanger when the defrosting system operates, the refrigerant can flow through the intermediate heat exchanger along the flowing direction of the refrigerant and is subjected to large resistance, and the refrigerant quantity of the defrosting cycle of the system is easily insufficient due to multiple reasons such as large pressure loss of the intermediate heat exchanger, so that the defrosting efficiency of the system is influenced.
Some manufacturers solve the problem of insufficient refrigerant quantity during system defrosting by filling refrigerant into the system, but this not only easily causes refrigerant over-filling and reduces system reliability, but also needs to add more refrigerator oil, buy an oil pump and the like, and causes cost increase.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to overcome the defects and shortcomings in the prior art and provide a cascade heat pump capable of improving defrosting efficiency.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a cascade heat pump capable of improving defrosting efficiency comprises a primary system, a secondary system and an intermediate heat exchanger shared by the primary system and the secondary system, wherein the intermediate heat exchanger is provided with a first input end, a first output end, a second input end and a second output end;
the primary system comprises a primary side compressor, a four-way valve, a first heat exchanger, an intermediate heat exchanger and a second heat exchanger, under the defrosting condition, a refrigerant in the compressor flows into the first heat exchanger through the four-way valve, the first heat exchanger is communicated with the intermediate heat exchanger through a one-way valve assembly, the refrigerant flows into the intermediate heat exchanger through the one-way valve assembly after flowing through the first heat exchanger, the refrigerant flows into the second heat exchanger for heat exchange after flowing through the intermediate heat exchanger, and the refrigerant after heat exchange returns to the compressor through the four-way valve.
Preferably, a port D of the four-way valve is connected to an output port of the primary-side compressor, a port E of the four-way valve is connected to the first heat exchanger, a port C of the four-way valve is connected to the second heat exchanger, and a port S of the four-way valve is connected to an input port of the primary-side compressor.
Preferably, the check valve assembly includes a first check valve, a second check valve, a third check valve and a fourth check valve, the first heat exchanger is connected to one end of the first check valve and one end of the second check valve, the second heat exchanger is connected to one end of the third check valve and one end of the fourth check valve, the first input end of the intermediate heat exchanger is connected to the other end of the first check valve and the other end of the fourth check valve, the first output end of the intermediate heat exchanger is connected to the other end of the second check valve and the other end of the third check valve, the first check valve and the second check valve are opposite in conduction direction, the third check valve and the fourth check valve are opposite in conduction direction, and when the cascade heat pump defrosts, the first check valve and the third check valve are in conduction state.
Preferably, the heat exchanger further comprises a first throttling device, one end of the first throttling device is connected with the first output end of the intermediate heat exchanger, and the other end of the first throttling device is connected with the second one-way valve and the third one-way valve respectively.
Preferably, the intermediate heat exchanger is a plate heat exchanger.
Preferably, the first heat exchanger is an air-refrigerant heat exchanger.
Preferably, the second heat exchanger is a water-refrigerant heat exchanger.
Preferably, the secondary system comprises a secondary side compressor and a water side heat exchanger, an output port of the secondary side compressor is connected with the water side heat exchanger and then connected with a second input end of the intermediate heat exchanger, and a second output end of the intermediate heat exchanger is connected with an input port of the secondary side compressor.
Preferably, the system further comprises a second throttling device, and the second throttling device is arranged between the water side heat exchanger and the second input end of the intermediate heat exchanger.
Preferably, the water side heat exchanger is a water-refrigerant heat exchanger.
Compared with the prior art, the utility model has the beneficial effects that:
according to the utility model, the second heat exchanger is additionally arranged in the primary system, so that when the system is defrosted, the refrigerant flows into the intermediate heat exchanger from the first input end of the intermediate heat exchanger and flows out from the first output port of the intermediate heat exchanger. Meanwhile, the second heat exchanger is used for evaporation during defrosting, so that the problems of insufficient refrigerant quantity, low defrosting efficiency and the like caused by large pressure loss of the intermediate heat exchanger due to the conventional intermediate heat exchanger evaporation can be solved.
Drawings
The present application will be described in further detail below with reference to the accompanying drawings and examples.
Fig. 1 is a schematic structural diagram of a cascade heat pump capable of improving defrosting efficiency according to an embodiment of the present application;
fig. 2 is a refrigerant flow diagram of a system during defrosting of the cascade heat pump capable of improving defrosting efficiency according to the embodiment of the present application.
In the figure:
1. a primary system; 11. a primary side compressor; 12. a four-way valve; 13. a first heat exchanger; 14. a second heat exchanger; 15. a first check valve; 16. a second one-way valve; 17. a third check valve; 18. a fourth check valve; 19. a first throttling device; 2. a secondary system; 21. a secondary-side compressor; 22. a water side heat exchanger; 23. a second throttling device; 3. an intermediate heat exchanger.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-fig. 2, the present embodiment provides a cascade heat pump capable of improving defrosting efficiency, which includes a primary system 1, a secondary system 2, and an intermediate heat exchanger 3 shared by the primary system 1 and the secondary system 2, where the intermediate heat exchanger 3 has a first input end, a first output end, a second input end, and a second output end;
the primary system 1 comprises a primary side compressor 11, a four-way valve 12, a first heat exchanger 13, an intermediate heat exchanger 3 and a second heat exchanger 14, under the defrosting condition, a refrigerant in the compressor flows into the first heat exchanger 13 through the four-way valve 12, the first heat exchanger 13 is communicated with the intermediate heat exchanger 3 through a one-way valve assembly, the refrigerant flows into the intermediate heat exchanger 3 through the one-way valve assembly after flowing through the first heat exchanger 13, the refrigerant enters the second heat exchanger 14 for heat exchange after flowing through the intermediate heat exchanger 3, and the refrigerant after heat exchange returns to the compressor through the four-way valve 12.
In the embodiment, by adding the second heat exchanger 14 to the primary system 1, the refrigerant flows into the intermediate heat exchanger 3 from the first input end of the intermediate heat exchanger 3 and flows out from the first output end of the intermediate heat exchanger 3 during defrosting, compared with the prior art, the flowing direction of the refrigerant inside the intermediate heat exchanger 3 during defrosting is changed, and the resistance of the refrigerant flowing through the inside of the intermediate heat exchanger 3 is reduced. Meanwhile, the second heat exchanger 14 is used for evaporation during defrosting in the embodiment, so that the problems of insufficient refrigerant quantity, low defrosting efficiency and the like caused by large pressure loss of the intermediate heat exchanger 3 due to evaporation of the intermediate heat exchanger 3 in the prior art are solved.
Specifically, a D port of the four-way valve 12 is connected to an output port of the primary-side compressor 11, an E port of the four-way valve 12 is connected to the first heat exchanger 13, a C port of the four-way valve 12 is connected to the second heat exchanger 14, and an S port of the four-way valve 12 is connected to an input port of the primary-side compressor 11.
The check valve assembly comprises a first check valve 15, a second check valve 16, a third check valve 17 and a fourth check valve 18, a first heat exchanger 13 is connected with one end of the first check valve 15 and one end of the second check valve 16 respectively, a second heat exchanger 14 is connected with one end of the third check valve 17 and one end of the fourth check valve 18 respectively, a first input end of an intermediate heat exchanger 3 is connected with the other end of the first check valve 15 and the other end of the fourth check valve 18 respectively, a first output end of the intermediate heat exchanger 3 is connected with the other end of the second check valve 16 and the other end of the third check valve 17 respectively, the first check valve 15 and the second check valve 16 are opposite in conduction direction, the third check valve 17 and the fourth check valve 18 are opposite in conduction direction, and when the double-heat pump is in defrosting mode, the first check valve 15 and the third check valve 17 are in conduction state.
Furthermore, the system also comprises a first throttling device 19, wherein one end of the first throttling device 19 is connected with a first output end of the intermediate heat exchanger 3, and the other end of the first throttling device 19 is respectively connected with the second check valve 16 and the third check valve 17. The first throttling device 19 can throttle and depressurize the refrigerant of the primary system 1, so that the refrigerant can fully exchange heat.
Preferably, the intermediate heat exchanger 3 of the present embodiment is a plate heat exchanger. The plate heat exchanger is a high-efficiency heat exchanger and is formed by stacking a series of metal sheets with certain corrugated shapes, thin rectangular channels are formed among various plate sheets, and heat exchange is carried out through the plate sheets. The plate heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, wide application, long service life and the like, and is ideal equipment for carrying out liquid-liquid and liquid-vapor heat exchange. It is understood that in other embodiments, the intermediate heat exchanger 3 may be selected from other conventional heat exchangers such as a shell-and-tube heat exchanger.
Preferably, the first heat exchanger 13 of the present embodiment is an air-refrigerant heat exchanger, and the second heat exchanger 14 is a water-refrigerant heat exchanger. Of course, in other embodiments, the first heat exchanger 13 and the second heat exchanger 14 may also be selected from other types of heat exchangers according to actual needs.
The secondary system 2 of the present embodiment includes a secondary-side compressor 21, a water-side heat exchanger 22, and an intermediate heat exchanger 3, wherein an output port of the secondary-side compressor 21 is connected to the water-side heat exchanger 22 and further connected to a second input port of the intermediate heat exchanger 3, and a second output port of the intermediate heat exchanger 3 is connected to an input port of the secondary-side compressor 21.
A second throttle device 23 is also arranged between the water side heat exchanger 22 and the second input of the intermediate heat exchanger 3. The second throttling device 23 can throttle and depressurize the refrigerant flowing in the secondary system 2, so that the refrigerant can fully exchange heat when flowing through the intermediate heat exchanger 3.
Preferably, the water-side heat exchanger 22 of the present embodiment preferably employs a water-refrigerant heat exchanger. Of course, in other embodiments, the water side heat exchanger 22 may be selected from other types according to actual needs.
As shown in fig. 2, during the defrosting operation, the primary system 1 is turned on, and the secondary system 2 is turned off, and the specific working principle is as follows: the primary side compressor 11 generates high-temperature and high-pressure refrigerant gas, the refrigerant gas enters the first heat exchanger 13 through the D port and the E port of the four-way valve 12 to be condensed into low-temperature and high-pressure refrigerant liquid, the first heat exchanger 13 absorbs heat emitted during the condensation of the refrigerant gas to defrost, the low-temperature and high-pressure refrigerant liquid flowing out of the first heat exchanger 13 flows into the intermediate heat exchanger 3 from the first input end of the intermediate heat exchanger 3 through the branch of the first one-way valve 15 and flows out from the first output end of the intermediate heat exchanger 3, the low-temperature and high-pressure refrigerant liquid flowing out of the intermediate heat exchanger 3 flows through the first throttling device 19 to be throttled and depressurized, the low-temperature and low-pressure refrigerant liquid after being throttled and depressurized enters the second heat exchanger 14 through the third one-way valve 17 to be evaporated into low-temperature and low-pressure refrigerant gas and flows out of the second heat exchanger 14, and the low-temperature and low-pressure refrigerant gas flows out of the second heat exchanger 14 through the C port of the four-way valve 12, The S port returns to the primary side compressor 11 to complete the entire defrost cycle.
It is to be understood that the description of "front", "back", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. indicating the orientation or positional relationship appearing in the description of the present invention is based on the orientation or positional relationship shown in the drawings, and is for convenience of description only, and does not indicate or imply that the device or element referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, is not to be construed as limiting the present invention.
It should be understood that the above-mentioned embodiments are merely illustrative of the technical concept and features of the present invention, and are not intended to limit the scope of the present invention, which is defined by the following claims.
Claims (10)
1. A cascade heat pump for improved defrost efficiency, characterized by comprising a primary system (1), a secondary system (2), and an intermediate heat exchanger (3) common to the primary system (1) and the secondary system (2), the intermediate heat exchanger (3) having a first input, a first output, a second input and a second output;
the primary system (1) comprises a primary side compressor (11), a four-way valve (12), a first heat exchanger (13), an intermediate heat exchanger (3) and a second heat exchanger (14), under the defrosting condition, refrigerant in the compressor flows into the first heat exchanger (13) through the four-way valve (12), the first heat exchanger (13) is communicated with the intermediate heat exchanger (3) through a one-way valve assembly, the refrigerant flows into the intermediate heat exchanger (3) through the one-way valve assembly after flowing through the first heat exchanger (13), the refrigerant flows into the second heat exchanger (14) for heat exchange after flowing through the intermediate heat exchanger (3), and the refrigerant after heat exchange returns to the compressor through the four-way valve (12).
2. The cascade heat pump capable of improving defrosting efficiency according to claim 1, wherein a port D of the four-way valve (12) is connected to an output port of the primary side compressor (11), a port E of the four-way valve (12) is connected to the first heat exchanger (13), a port C of the four-way valve (12) is connected to the second heat exchanger (14), and a port S of the four-way valve (12) is connected to an input port of the primary side compressor (11).
3. The cascade heat pump capable of improving defrosting efficiency according to claim 1, wherein the check valve assembly comprises a first check valve (15), a second check valve (16), a third check valve (17) and a fourth check valve (18), the first heat exchanger (13) is connected with one end of the first check valve (15) and one end of the second check valve (16), the second heat exchanger (14) is connected with one end of the third check valve (17) and one end of the fourth check valve (18), the first input end of the intermediate heat exchanger is connected with the other end of the first check valve (15) and the other end of the fourth check valve (18), the first output end of the intermediate heat exchanger is connected with the other end of the second check valve (16) and the other end of the third check valve (17), the first check valve (15) and the second check valve (16) are conducted in opposite directions, the third check valve (17) and the fourth check valve (18) are opposite in conducting direction, and when the cascade heat pump defrosts, the first check valve (15) and the third check valve (17) are in a conducting state.
4. The cascade heat pump capable of improving defrosting efficiency according to claim 3, further comprising a first throttling device (19), wherein one end of the first throttling device (19) is connected to the first output end of the intermediate heat exchanger, and the other end of the first throttling device is connected to the second check valve (16) and the third check valve (17), respectively.
5. The cascade heat pump with increased defrost efficiency according to claim 1, characterized in that the intermediate heat exchanger (3) is a plate heat exchanger.
6. The cascade heat pump for improving defrost efficiency as claimed in claim 1, wherein said first heat exchanger (13) is an air-refrigerant heat exchanger.
7. The cascade heat pump for improving defrost efficiency as claimed in claim 1, wherein said second heat exchanger (14) is a water-refrigerant heat exchanger.
8. The cascade heat pump according to any of the claims 1 to 7 with improved defrost efficiency, characterized in that the secondary system (2) comprises a secondary side compressor (21), a water side heat exchanger (22) and the intermediate heat exchanger (3), wherein the output of the secondary side compressor (21) is connected to the water side heat exchanger (22) and thus to the second input of the intermediate heat exchanger, and wherein the second output of the intermediate heat exchanger is connected to the input of the secondary side compressor (21).
9. The cascade heat pump capable of improving defrosting efficiency according to claim 8, further comprising a second throttling device (23), wherein the second throttling device (23) is arranged between the water side heat exchanger (22) and the second input end of the intermediate heat exchanger.
10. The cascade heat pump for improving defrosting efficiency according to claim 8, wherein the water side heat exchanger (22) is a water-refrigerant heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121541571.8U CN216159377U (en) | 2021-07-07 | 2021-07-07 | Cascade heat pump capable of improving defrosting efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121541571.8U CN216159377U (en) | 2021-07-07 | 2021-07-07 | Cascade heat pump capable of improving defrosting efficiency |
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| Publication Number | Publication Date |
|---|---|
| CN216159377U true CN216159377U (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121541571.8U Active CN216159377U (en) | 2021-07-07 | 2021-07-07 | Cascade heat pump capable of improving defrosting efficiency |
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| CN (1) | CN216159377U (en) |
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2021
- 2021-07-07 CN CN202121541571.8U patent/CN216159377U/en active Active
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