Heat pump system

Abstract

The utility model relates to the technical field of heat pump systems, in particular to a heat pump system, and aims to solve the problem that a throttling valve is easily damaged due to the fact that the temperature of a refrigerant is too high before the refrigerant flows through the throttling valve in the existing heat pump system. The heat pump system comprises a first refrigerant circulation loop, a first compressor, a first heat exchanger, a first throttling valve and a second heat exchanger, wherein the first compressor, the first heat exchanger, the first throttling valve and the second heat exchanger are sequentially arranged on the first refrigerant circulation loop. The heat pump system further comprises a refrigerant branch and a second throttling valve arranged on the refrigerant branch, one end of the refrigerant branch communicates with the portion, between the first throttling valve and the first heat exchanger, of the first refrigerant circulation loop, and the other end of the refrigerant branch communicates with the first compressor. The heat pump system further comprises a cooling pipeline, and the cooling pipeline is arranged to be capable of exchanging heat with the first refrigerant circulation loop between the communication position of the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger. According to the utility model, refrigerant with overhigh temperature can be prevented from flowing through the throttle valve, and the throttle valve is prevented from being damaged.

Description

[0001] This application claims priority to Chinese patent application CN202323518995.4, filed on December 22, 2023, with the utility model name “Heat Pump System”. The entire contents of the above Chinese patent application are incorporated into this application by reference. Technical Field

[0002] The utility model relates to the technical field of heat pump systems, and specifically provides a heat pump system. Background Art

[0003] In the heat pump system, the use pipeline in the use side heat exchanger exchanges heat with the refrigerant circulation loop to heat the water or other media that need to be heated in the use pipeline. When the medium temperature in the use pipeline reaches the target temperature, the refrigerant medium temperature in the refrigerant circulation loop in the use side heat exchanger is higher, which will be higher than the target temperature. After the refrigerant flows out of the use side heat exchanger, it will flow through the throttle valve and circulate in the refrigerant circulation loop.

[0004] In the prior art, high temperature in the field of heat pumps is usually understood to be a maximum of about 90°C. For a heat pump system, if the water temperature or other medium temperature in the pipeline is around 90°C, then the temperature of the refrigerant medium in the refrigerant circulation loop will generally not damage the throttle valve. However, in the latest research results, an ultra-high temperature heat pump technology has begun to be developed. In an ultra-high temperature heat pump system, the medium temperature in the pipeline is often higher than 90°C, for example, around 120°C. At this time, the refrigerant medium temperature in the refrigerant circulation loop that exchanges heat with the pipeline will reach 130°C or above. Of course, it is not limited to 120℃ and 130℃. As the temperature required by the medium in the pipeline increases, the temperature in the refrigerant circulation loop will also increase. Ultra-high temperature heat pump technology is still under development; ultra-high temperature heat pump systems require special throttle valves that are resistant to ultra-high temperatures, but at present, this kind of ultra-high temperature throttle valve specially used in heat pump systems is limited by technology, especially material technology, and it is still difficult to break through the bottleneck. Only one or two foreign manufacturers can produce it, which seriously restricts the popularization of ultra-high temperature technology in domestic equipment, and the cost of its throttle valve is difficult to reduce. However, if an ordinary throttle valve is used in an ultra-high temperature heat pump system, the temperature of the refrigerant medium flowing through the throttle valve is too high, which may exceed the temperature resistance range of the throttle valve, causing the material to soften, deform or damage, thereby affecting the normal operation of the heat pump system.

[0005] Based on the above reasons, whether it is a single-stage refrigerant circulation heat pump system or a two-stage or multi-stage refrigerant circulation heat pump system, the refrigerant temperature before flowing through the throttle valve is too high, exceeding the conventional 90°C, for example, exceeding 110°C, which is easy to damage the throttle valve. This requires cooling the refrigerant medium before flowing through the throttle valve to avoid damage to the throttle valve due to excessively high temperature when flowing through the throttle valve, so that conventional throttle valves can also be applied to ultra-high temperature heat pump technology, solving the current dilemma and providing another research and development idea different from the research and development of ultra-high temperature resistant throttle valves.

[0006] Accordingly, the art needs a new heat pump system to solve the above problems. Utility Model Content

[0007] The utility model aims to solve the above technical problem, that is, to solve the problem that the refrigerant temperature before flowing through the throttle valve in the existing heat pump system is too high and the throttle valve is easily damaged.

[0008] In a first aspect, the utility model provides a heat pump system, the heat pump system comprising a first refrigerant circulation loop and a first compressor, a first heat exchanger, a first throttle valve and a second heat exchanger sequentially arranged on the first refrigerant circulation loop;

[0009] The heat pump system further includes a refrigerant branch and a second throttle valve arranged on the refrigerant branch.

[0010] One end of the refrigerant branch is connected to the first refrigerant circulation circuit between the first throttle valve and the first heat exchanger, and the other end of the refrigerant branch is connected to the first compressor;

[0011] The heat pump system further includes a cooling pipeline, which is configured to be able to exchange heat with the first refrigerant circulation circuit between the connection point between the refrigerant branch and the first refrigerant circulation circuit and the first heat exchanger.

[0012] In the preferred technical solution of the above heat pump system, the heat pump system further comprises a second refrigerant circulation loop and a second compressor, the second heat exchanger, a third throttle valve and a third heat exchanger which are sequentially arranged on the second refrigerant circulation loop.

[0013] The first refrigerant circulation circuit and the second refrigerant circulation circuit exchange heat in the second heat exchanger.

[0014] In the preferred technical solution of the above heat pump system, the second heat exchanger includes a first heat exchange device and a second heat exchange device, the first heat exchange device is arranged on the first refrigerant circulation loop, and the second heat exchange device is arranged on the second refrigerant circulation loop.

[0015] The heat pump system also includes a water circulation loop, a pump device and a water storage tank.

[0016] The water storage tank, the pump device, the second heat exchange device and the first heat exchange device are sequentially arranged on the water circulation loop.

[0017] In the preferred technical solution of the above-mentioned heat pump system, the heat pump system also includes a reheater arranged on the first refrigerant circulation loop, and the reheater is located between the connecting point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger. After passing through the second heat exchanger, the first refrigerant circulation loop passes through the reheater again and is finally connected to the first compressor. The cooling pipeline is the part of the first refrigerant circulation loop that passes through the reheater for the second time.

[0018] In the preferred technical solution of the above-mentioned heat pump system, one end of the cooling pipeline is connected to the water circulation loop between the pump device and the second heat exchange device, and the other end of the cooling pipeline is connected to the water storage tank. The connection point between the cooling pipeline, the refrigerant branch and the first refrigerant circulation loop is close to and arranged in parallel with the first refrigerant circulation loop between the first heat exchanger, so that the cooling pipeline and the first refrigerant circulation loop can exchange heat.

[0019] In the preferred technical solution of the above-mentioned heat pump system, the heat pump system also includes a heat regenerator, which is located on the first refrigerant circulation loop between the connection point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger, and the cooling pipeline and the first refrigerant circulation loop exchange heat through the heat regenerator.

[0020] In the preferred technical solution of the above heat pump system, a regulating valve is provided on the cooling pipeline.

[0021] In a preferred technical solution of the above heat pump system, a temperature sensor is provided on the first refrigerant circulation loop between the connecting point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger.

[0022] In the preferred technical solution of the above heat pump system, the heat pump system further comprises a water storage tank and a pump device.

[0023] Both ends of the cooling pipeline are connected to the water storage tank to form a water circulation loop.

[0024] The pump device is arranged on the water circulation loop, and the cooling pipeline passes through the second heat exchanger.

[0025] In the preferred technical solution of the above-mentioned heat pump system, the heat pump system also includes an economical heat exchanger, which is located on the first refrigerant circulation loop between the connecting point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger, and the refrigerant branch exchanges heat with the first refrigerant circulation loop through the economical heat exchanger.

[0026] In a preferred technical solution of the above heat pump system, the cooling pipeline passes through the second heat exchanger to exchange heat with the first refrigerant circulation loop in the second heat exchanger.

[0027] In the preferred technical solution of the above-mentioned heat pump system, the heat pump system also includes a temperature sensor, which is arranged before the first throttle valve and / or the second throttle valve to detect the temperature of the refrigerant medium flowing into the first throttle valve and the second throttle valve after being cooled by the cooling pipeline.

[0028] In a second aspect, the utility model also provides a heat pump system, which includes a first refrigerant circulation loop and a first compressor, a first heat exchanger, a first throttle valve and a second heat exchanger arranged in sequence on the first refrigerant circulation loop; it also includes a cooling pipeline, which is configured to be able to exchange heat with the first refrigerant circulation loop between the first heat exchanger and the first throttle valve; the cooling pipeline also passes through the second heat exchanger to exchange heat with the first refrigerant circulation loop in the second heat exchanger.

[0029] The heat pump system further includes a temperature sensor, which is disposed before the first throttle valve to detect the temperature of the refrigerant flowing into the first throttle valve after being cooled by the cooling pipeline.

[0030] In the case of adopting the above technical solution, the heat pump system of the utility model includes a first refrigerant circulation loop and a first compressor, a first heat exchanger, a first throttle valve and a second heat exchanger sequentially arranged on the first refrigerant circulation loop; the heat pump system also includes a refrigerant branch and a second throttle valve arranged on the refrigerant branch, one end of the refrigerant branch is connected to the first refrigerant circulation loop between the first throttle valve and the first heat exchanger, and the other end of the refrigerant branch is connected to the first compressor; the heat pump system also includes a cooling pipeline, and the cooling pipeline is arranged to be able to exchange heat with the first refrigerant circulation loop between the connection point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger. The utility model can cool the refrigerant medium flowing through the first throttle valve and the second throttle valve through the cooling pipeline, so as to prevent the refrigerant with too high temperature from exceeding the safe temperature of the throttle valve, thereby preventing the throttle valve from being damaged.

[0031] Furthermore, after exchanging heat with the first refrigerant circulation circuit before the first throttle valve and the second throttle valve, the cooling pipeline of the utility model passes through the second heat exchanger to exchange heat with the second heat exchanger, which helps to improve the heat exchange efficiency of the second heat exchanger.

[0032] On the other hand, the heat pump system includes a first refrigerant circulation circuit and a first compressor, a first heat exchanger, a first throttle valve, and a second heat exchanger sequentially arranged on the first refrigerant circulation circuit; and also includes a cooling pipeline, which is arranged to be able to exchange heat with the first refrigerant circulation circuit between the first heat exchanger and the first throttle valve; the cooling pipeline also passes through the second heat exchanger to exchange heat with the first refrigerant circulation circuit in the second heat exchanger. The cooling pipeline can absorb the heat of the first refrigerant circulation circuit before the first throttle valve to cool the refrigerant medium flowing into the first throttle valve, and can also use the absorbed heat to flow into the second heat exchanger to exchange heat with the second heat exchanger, thereby improving the heat exchange efficiency of the second heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0034] Figure 1 It is a structural schematic diagram of a heat pump system of a first preferred embodiment of the utility model;

[0035] Figure 2 It is a structural schematic diagram of a heat pump system of a second preferred embodiment of the utility model;

[0036] Figure 3 A schematic structural diagram of a heat pump system according to a third preferred embodiment of the present invention;

[0037] Figure 4 It is a structural schematic diagram of a heat pump system according to a fourth preferred embodiment of the utility model;

[0038] Figure 5 It is a structural schematic diagram of a heat pump system of a fifth preferred embodiment of the utility model;

[0039] Figure 6 It is a structural schematic diagram of a heat pump system of a sixth preferred embodiment of the utility model;

[0040] Figure 7 is a structural schematic diagram of a heat pump system according to a seventh preferred embodiment of the utility model;

[0041] Reference numerals:

[0042] 10. First refrigerant circulation loop; 11. First compressor; 12. First heat exchanger; 121. First heat exchange pipeline; 122. First refrigerant pipeline; 13. First throttle valve; 14. Second heat exchanger; 141. First heat exchange device; 142. Second heat exchange device; 15. Refrigerant branch; 16. Second throttle valve; 17. Cooling pipeline; 18. Second compressor; 19. Third throttle valve; 20. Third heat exchanger; 201. Second heat exchange pipeline; 202. Second refrigerant pipeline; 21. Water storage tank; 22. Pump device; 23. Regenerator; 24. Economic heat exchanger; 25. Control valve; 26. Temperature sensor; 27. Second refrigerant circulation loop; 28. Water circulation loop; 29. ​​Heat source pipeline. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0044] It should be noted that, in the description of the present invention, the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0045] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] See first Figure 1 ,like Figure 1 As shown, the heat pump system of the utility model includes a first refrigerant circulation loop 10 and a first compressor 11, a first heat exchanger 12, a first throttle valve 13 and a second heat exchanger 14 which are sequentially arranged on the first refrigerant circulation loop 10; the heat pump system also includes a refrigerant branch 15 and a second throttle valve 16 which is arranged on the refrigerant branch 15, one end of the refrigerant branch 15 is connected to the first refrigerant circulation loop 10 between the first throttle valve 13 and the first heat exchanger 12, and the other end of the refrigerant branch 15 is connected to the first compressor 11; after the refrigerant flows from the first compressor 11 to the first heat exchanger 12, a part of it flows through the first throttle valve 13 and flows into the second heat exchanger 14, and the other part flows through the refrigerant branch 15 and flows back into the first compressor 11, and the refrigerant flow direction is located in the first refrigerant circulation loop 10 downstream of the first heat exchanger 12 ( Figure 1The pipeline in the middle economic heat exchanger 24 is at least partially close to, closely attached to, or arranged in parallel with the refrigerant branch 15, so that the refrigerant medium flowing through the second throttle valve 16 is further cooled by throttling to reduce the pressure and temperature, so as to reduce the refrigerant medium in the first refrigerant circulation loop 10. After heat exchange, the gaseous refrigerant medium in the refrigerant branch 15 flows back to the first compressor 11, and the stabilized supercooled liquid in the first refrigerant circulation loop 10 passes through the first throttle valve 13 and flows into the second heat exchanger 14 for heat exchange.

[0047] Continue reading Figure 1 The heat pump system further includes a cooling pipeline 17, which is configured to be able to exchange heat with the first refrigerant circulation loop 10 between the connection point between the refrigerant branch 15 and the first refrigerant circulation loop 10 and the first heat exchanger 12. Specifically, the heat pump system further includes a regenerator 23 disposed on the first refrigerant circulation loop 10, and the regenerator 23 is located between the connection point between the refrigerant branch 15 and the first refrigerant circulation loop 10 and the first heat exchanger 12. After passing through the second heat exchanger 14, the first refrigerant circulation loop 10 passes through the regenerator 23 again and is finally connected to the first compressor 11. The cooling pipeline 17 is the portion of the first refrigerant circulation loop 10 that passes through the regenerator for the second time. That is to say, the cooling pipeline 17 is also a part of the first refrigerant circulation loop 10, the first heat exchanger 12 is used as a condenser, and the second heat exchanger 14 is used as an evaporator. The low-temperature and low-pressure refrigerant medium flowing out of the second heat exchanger 14 first flows through the regenerator 23 when flowing back to the first compressor 11, and exchanges heat with the first refrigerant circulation loop 10 in the regenerator 23, so that the refrigerant medium before flowing through the first throttle valve 13 and the second throttle valve 16 is cooled, avoiding excessive temperature and breaking through the safety temperature of the first throttle valve 13 and the second throttle valve 16, thereby preventing the first throttle valve 13 and the second throttle valve 16 from being damaged.

[0048] The utility model firstly performs a first cooling of the refrigerant medium flowing through the first throttle valve 13 and the second throttle valve 16 through the refrigerant branch 15, and then performs a second cooling of the refrigerant medium flowing through the first throttle valve 13 and the second throttle valve 16 through the medium in the cooling pipeline 17. The double cooling is more secure and avoids damage to the two throttle valves.

[0049] Although it is described above that damage to the two throttle valves is avoided by double cooling, this does not mean that the utility model must solve the problem of how to avoid damage to the two throttle valves by double cooling. It is not restrictive but a preferred setting. In another embodiment, the refrigerant branch 15 is not close to or close to or arranged in parallel with the first refrigerant circulation loop 10 located downstream of the first heat exchanger 12 in the refrigerant flow direction. That is to say, the refrigerant branch 15 does not exchange heat with the first refrigerant circulation loop 10 after the first heat exchanger 12. Only by reducing the refrigerant medium flowing through the first throttle valve 13 and the second throttle valve 16 through the cooling pipe 17, the two throttle valves can still be avoided from being damaged.

[0050] In another embodiment, the "cooling pipeline" is not a newly set pipeline structure, that is, the "cooling pipeline" is not the cooling pipeline 17, but when the refrigerant branch 15 is close to, close to or arranged in parallel with the first refrigerant circulation loop 10 located downstream of the first heat exchanger 12 in the refrigerant flow direction, and can exchange heat with the first refrigerant circulation loop 10, the "cooling pipeline" is formed by part of the refrigerant branch 15. The "cooling pipeline" formed only by the refrigerant branch 15 can also play a role in preventing the two throttle valves from being damaged.

[0051] In the first preferred embodiment of the utility model, the cooling pipeline 17 is the first refrigerant circulation loop 10 that flows through the heat exchanger 23 for the second time. This is not restrictive. The first refrigerant circulation loop 10 can also flow directly back to the first compressor 11 after flowing through the second heat exchanger 14. The cooling pipeline 17 is a separate pipeline, and cold or warm water can be passed into it.

[0052] The first heat exchanger 12 includes a first heat exchange pipeline 121 and a first refrigerant pipeline 122. The first refrigerant pipeline 122 is a part of the first refrigerant circulation loop 10. The first heat exchange pipeline 121 and the first refrigerant pipeline 122 exchange heat in the first heat exchanger 12. Water or other media that need to be heated can pass through the first heat exchange pipeline 121 for heating. The first heat exchange pipeline 121 is the use pipeline in the use side heat exchanger mentioned in the background technology.

[0053] Continue reading Figure 1In the first preferred embodiment, the heat pump system further comprises a second refrigerant circulation loop 27 and a second compressor 18, a second heat exchanger 14, a third throttle valve 19 and a third heat exchanger 20 which are sequentially arranged on the second refrigerant circulation loop 27. The first refrigerant circulation loop 10 and the second refrigerant circulation loop 27 exchange heat in the second heat exchanger 14. When the medium in the first heat exchange pipeline 121 in the first heat exchanger 12 is heated, the refrigerant medium in the first refrigerant circulation loop 10 flows through the second heat exchanger 14 and evaporates to absorb heat. When the refrigerant medium in the second refrigerant circulation loop 27 flows through the second heat exchanger 14, it condenses to dissipate heat. Based on this, the two refrigerant circulation loops realize heat exchange in the second heat exchanger 14. The two-stage heat pump system has higher energy efficiency, can improve the thermal efficiency of the entire system, and is suitable for a wider range of working conditions and can operate more stably. Of course, this is not restrictive. The heat pump system of the utility model can also be a single-stage circulation heat pump system or a multi-stage circulation heat pump system. Those skilled in the art can set it according to actual conditions.

[0054] The third heat exchanger 20 includes a second heat exchange pipeline 201 and a second refrigerant pipeline 202. The second refrigerant pipeline 202 is a part of the second refrigerant circulation loop 27. The second heat exchange pipeline 201 is connected to the heat source, and a medium with a higher temperature is introduced, which helps the evaporation heat absorption of the third heat exchanger 20.

[0055] See next Figure 2 The difference between the heat pump system of the second preferred embodiment of the present application and the heat pump system of the first preferred embodiment is that the second heat exchanger 14 includes a first heat exchange device 141 and a second heat exchange device 142, the first heat exchange device 141 is arranged on the first refrigerant circulation loop 10, and the second heat exchange device 142 is arranged on the second refrigerant circulation loop 27, and the heat pump system also includes a water circulation loop 28, a pump device 22 and a water storage tank 21, and the water circulation loop 28 is sequentially provided with a water storage tank 21, a pump device 22, a second heat exchange device 142 and a first heat exchange device 141. Specifically, the first heat exchange device 141 and the second heat exchange device 142 are also heat exchangers. When the medium in the first heat exchange pipeline 121 in the first heat exchanger 12 is heated, the first heat exchange device 141 is an evaporator, and the second heat exchange device 142 is a condenser. The pump device 22 drives the water in the water storage tank 21 to flow through the second heat exchange device 142 for heating, and then through the first heat exchange device 141 for cooling, and finally flows back to the water storage tank 21. After the first refrigerant circulation loop 10 flows through the first heat exchange device 141, it flows through the regenerator 23 again and is connected to the first compressor 11. The cooling pipeline 17 is a part of the first refrigerant circulation loop 10. The remaining structures are the same as the first preferred embodiment and are not repeated here.

[0056] See next Figure 3 ,like Figure 3As shown, the difference between the heat pump system of the third preferred embodiment of the utility model and the heat pump system of the second preferred embodiment is that the cooling pipe 17 is not a part of the first refrigerant circulation loop 10. After passing through the first heat exchange device 141, the first refrigerant circulation loop 10 is directly connected to the first compressor 11. One end of the cooling pipe 17 is connected to the water circulation loop 28 between the pump device 22 and the second heat exchange device 142. The other end of the cooling pipe 17 is connected to the water storage tank 21. The connection between the cooling pipe 17 and the refrigerant branch 15 and the first refrigerant circulation loop 10 is close to and arranged in parallel with the first refrigerant circulation loop 10 between the first heat exchanger 12, so that the cooling pipe 17 and the first refrigerant circulation loop 10 can exchange heat. The water in the water circulation loop 28 after being cooled by the first heat exchange device 141 enters the water storage tank 21, and is then driven by the pump device 22 into the cooling pipe 17 to cool the refrigerant medium before the first throttle valve 13 and the second throttle valve 16.

[0057] The heat pump system of the third preferred embodiment also includes a regenerator 23, which is located on the first refrigerant circulation loop 10 between the connection point between the refrigerant branch 15 and the first refrigerant circulation loop 10 and the first heat exchanger 12, and the cooling pipeline 17 and the first refrigerant circulation loop 10 exchange heat through the regenerator 23.

[0058] The cooling pipeline 17 of the heat pump system in the third preferred embodiment is provided with a regulating valve 25 for regulating the flow of water flowing into the cooling pipeline 17 .

[0059] A temperature sensor 26 is further provided before the first throttle valve 13 of the third preferred embodiment. The opening of the regulating valve 25 is adjusted according to the temperature of the temperature sensor 26 to control the flow rate flowing through the cooling pipeline 17. The controller of the heat pump system is configured to receive the temperature of the temperature sensor and adjust the opening of the regulating valve 25 according to the received temperature information. If the temperature is greater than or equal to the first preset temperature, the opening of the regulating valve 25 is controlled to become larger. If the temperature is lower than the first preset temperature, the opening of the regulating valve 25 is controlled to become smaller or remain unchanged.

[0060] In other embodiments, preferably, there is a temperature sensor 26 before the first throttle valve 13 to detect the temperature of the refrigerant flowing into the first throttle valve 13. Since the refrigerant of the first throttle valve 13 and the second throttle valve 16 have the same source, the temperature of the refrigerant flowing into the first throttle valve 13 and the temperature of the refrigerant flowing into the second throttle valve 16 are the same. Therefore, it is sufficient to detect the temperature of the refrigerant before the first throttle valve 13. Based on the above structural setting, the opening of the second throttle valve 16 can be adjusted according to the temperature of the temperature sensor 26. To ensure the cooling effect of the refrigerant branch 15, for example, the controller of the heat pump system is configured to receive the temperature of the temperature sensor and adjust the opening of the second throttle valve 16 according to the received temperature information. If the temperature is greater than or equal to the second preset temperature, it is proved that the temperature flowing into the first throttle valve 13 and the second throttle valve 16 is too high and may exceed the safety temperature of the valve, so the opening of the second throttle valve 16 is controlled to be smaller, and the throttling, cooling and pressure reduction effect of the second throttle valve 16 is improved. After the opening of the second throttle valve 16 is reduced, the refrigerant branch 15 and the first throttle valve 16 are connected. The temperature of the refrigerant medium exchanged in the first refrigerant circulation loop 10 is reduced, so the cooling effect on the refrigerant medium in the first refrigerant circulation loop 10 can be improved; if the temperature is less than the second preset temperature, it proves that the temperature flowing into the first throttle valve 13 and the second throttle valve 16 will not exceed the safety temperature of the valve, and the opening of the second throttle valve 16 can be controlled to remain unchanged, or the opening of the second throttle valve 16 can be controlled accordingly to become larger. The structural setting mode and control method described in this paragraph can be applied to any one of the first to sixth embodiments; of course, the above-mentioned adjustment of the opening of the second throttle valve 16 according to the detected temperature is only one of the schemes, which needs to be adjusted in combination with the overall operating state of the system. There may also be insufficient cooling due to the small valve opening. At this time, different forms such as adjusting the compressor frequency are used. The purpose of the description of this scheme is to make those skilled in the art know that when the temperature sensor 26 detects that the temperature is higher than the threshold, the opening of the second throttle valve 16 can be adjusted to ensure the cooling effect. At the same time, the adjustment of the opening of the second throttle valve 16 can also be combined with other parameters and other devices to achieve the cooling effect.

[0061] Based on the setting of the temperature sensor 26 , the temperature of the fluid flowing into the first throttle valve 13 and the second throttle valve 16 can be detected in real time, thereby ensuring the reliability of the first throttle valve 13 and the second throttle valve 16 .

[0062] The first preset temperature and the second preset temperature may be the same or different, as long as their values ​​do not exceed the safety temperatures of the first throttle valve and the second throttle valve. Those skilled in the art may set them according to actual conditions.

[0063] The temperature sensor 26 can be arranged before the first throttle valve 13, or before the second throttle valve 16, or it can be located both before the first throttle valve 13 and before the second throttle valve 16, as long as it can detect the temperature of the refrigerant medium flowing into the two valves, that is, detect the temperature of the refrigerant medium after the first refrigerant circulation loop 10 is cooled by the "cooling pipeline". Technical personnel in this field can set it according to actual conditions.

[0064] In the third preferred embodiment, a temperature sensor 26 may be provided on the first refrigerant circulation loop 10 between the connection point between the refrigerant branch 15 and the first refrigerant circulation loop 10 and the first heat exchanger 12, and those skilled in the art may set it according to actual conditions.

[0065] In another preferred embodiment, the cooling pipeline 17 is not a part of the first refrigerant circulation loop 10, and the heat pump system also includes a water tank 21 and a pump device 22. Both ends of the cooling pipeline 17 are connected to the water tank 21 to form a water circulation loop. The pump device 22 is arranged on the water circulation loop. After the cooling pipeline 17 is cooled by the first heat exchange device 141, it flows through the heat regenerator 23 for heat exchange.

[0066] See next Figure 4 ,like Figure 4 As shown, the difference between the fourth preferred embodiment of the utility model and the first preferred embodiment is that the former is a single-stage refrigerant circulation system, and the latter is a two-stage refrigerant circulation system. In the fourth preferred embodiment, the second compressor 18, the third throttle valve 19, the third heat exchanger 20, the second heat exchange pipeline 201, the second refrigerant pipeline 202, and the second refrigerant circulation loop 27 are not set, and a heat source pipeline 29 is set. The heat source pipeline 29 flows through the second heat exchanger 14. A medium with a higher temperature is passed through the heat source pipeline 29, which helps the evaporation heat absorption of the second heat exchanger 14. The rest of the settings are the same in the two embodiments and will not be repeated here.

[0067] See next Figure 5 ,like Figure 5 As shown, the difference between the fifth preferred embodiment of the utility model and the fourth preferred embodiment is that after the first refrigerant circulation loop 10 flows through the second heat exchanger 14, it directly flows back to the first compressor 11 and no longer flows through the regenerator 23. The cooling pipeline 17 is not the first refrigerant circulation loop 10 that flows through the regenerator 23 for the second time. The cooling pipeline 17 is a separate pipeline structure. A low-temperature fluid, such as low-temperature water, or other low-temperature fluids that can absorb heat, is passed into the cooling pipeline 17.

[0068] See next Figure 6 ,like Figure 6As shown, the sixth preferred embodiment of the utility model is based on the fifth preferred embodiment, and the cooling pipeline 17 passes through the second heat exchanger 14. That is, the cooling pipeline 17 first exchanges heat with the first refrigerant circulation loop before the first throttle valve 13 and the second throttle valve 16 to absorb heat and reduce the temperature of the refrigerant medium before the first throttle valve 13 and the second throttle valve 16. After the fluid in the cooling pipeline 17 absorbs heat, it flows through the second heat exchanger 14. The absorbed heat helps the second heat exchanger 14 to perform evaporation.

[0069] Furthermore, in order to improve the evaporation efficiency of the second heat exchanger 14, a heat source pipeline 29 can be connected to the cooling pipeline 17 downstream of the regenerator 23 (in the direction of fluid flow) and upstream of the second heat exchanger 14. A medium with a higher temperature is introduced into the heat source pipeline 29 to help the evaporation heat absorption of the second heat exchanger 14.

[0070] See next Figure 7 ,like Figure 7 As shown, the heat pump system of the seventh preferred embodiment includes a first refrigerant circulation loop 10, and a first compressor 11, a first heat exchanger 12, a first throttle valve 13, and a second heat exchanger 14 sequentially arranged on the first refrigerant circulation loop 10; and further includes a cooling pipeline 17, which is arranged to be able to exchange heat with the first refrigerant circulation loop 10 between the first heat exchanger 12 and the first throttle valve 13; the cooling pipeline 17 also passes through the second heat exchanger 14 to exchange heat with the first refrigerant circulation loop 10 in the second heat exchanger 14. The cooling pipeline 17 can absorb the heat of the first refrigerant circulation loop 10 before the first throttle valve 13 to cool the refrigerant medium flowing into the first throttle valve 13, and can also use the absorbed heat to flow into the second heat exchanger 14 to exchange heat with the first refrigerant circulation loop in the second heat exchanger 14, thereby improving the heat exchange efficiency of the second heat exchanger 14.

[0071] In addition, it also includes a reheater 23, which is located on the first refrigerant circulation loop 10 between the connection point between the refrigerant branch 15 and the first refrigerant circulation loop 10 and the first heat exchanger 12, and the cooling pipeline 17 and the first refrigerant circulation loop 10 exchange heat through the reheater 23.

[0072] In this preferred embodiment, in order to improve the evaporation efficiency of the second heat exchanger 14, a heat source pipeline 29 can be connected to the cooling pipeline 17 downstream of the regenerator 23 (in the direction of fluid flow) and upstream of the second heat exchanger 14. A medium with a higher temperature is introduced into the heat source pipeline 29, which helps the evaporation heat absorption of the second heat exchanger 14.

[0073] Furthermore, in the seventh preferred embodiment, a temperature sensor 26 is arranged before the first throttle valve 13. The temperature sensor 26 is used to detect the refrigerant flowing into the first throttle valve 13, that is, to detect the temperature of the refrigerant after the first refrigerant circulation loop 10 is cooled through the cooling pipe 17. According to the detected temperature, the controller of the heat pump system controls the flow in the cooling pipe 17. If the detected temperature exceeds the safety temperature of the valve, the flow of the cooling pipe 17 is controlled to increase. If the detected temperature does not exceed the safety temperature of the valve, the flow of the cooling pipe 17 is controlled to decrease or remain unchanged.

[0074] In all the above preferred embodiments, the heat regenerator 23 may not be provided, and the cooling pipeline 17 may be directly provided close to, closely to, or in parallel with the first refrigerant circulation loop 10 before the first throttle valve 13 and the second throttle valve 16. In the close, closely to, or in parallel part, the cooling pipeline 17 and the first refrigerant circulation loop 10 are both curved pipelines to achieve sufficient heat exchange.

[0075] Furthermore, in the utility model, the heat pump system also includes an economical heat exchanger 24, which is located on the first refrigerant circulation loop 10 between the connecting point between the refrigerant branch 15 and the first refrigerant circulation loop 10 and the first heat exchanger 12, and the refrigerant branch 15 exchanges heat with the first refrigerant circulation loop 10 through the economical heat exchanger 24. In a feasible example, the economical heat exchanger 24 may not be set, and the refrigerant branch 15 and the first refrigerant circulation loop 10 between the first heat exchanger 12 and the first throttle valve 13 may be close to, close to, or arranged in parallel. In the close, close to, or parallel part, the refrigerant branch 15 and the first refrigerant circulation loop 10 are both curved pipes to achieve sufficient heat exchange.

[0076] Preferably, the first compressor 11 is an air intake type compressor, and the refrigerant branch 15 is connected to the air intake port of the compressor; alternatively, the first compressor 11 is an air supply type compressor, and the refrigerant branch 15 is connected to the air supply port of the compressor.

[0077] It should be noted that the present invention does not impose any restrictions on the types of heat exchangers or heat exchange devices mentioned above. It can be a finned heat exchanger, a shell and tube heat exchanger, or other types of heat exchangers. Those skilled in the art can set them according to actual conditions.

[0078] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A heat pump system, characterized in that: The heat pump system comprises a first refrigerant circulation loop and a first compressor, a first heat exchanger, a first throttle valve and a second heat exchanger which are sequentially arranged on the first refrigerant circulation loop; The heat pump system further includes a refrigerant branch and a second throttle valve arranged on the refrigerant branch. One end of the refrigerant branch is connected to the first refrigerant circulation circuit between the first throttle valve and the first heat exchanger, and the other end of the refrigerant branch is connected to the first compressor; The heat pump system further includes a cooling pipeline, which is configured to be able to exchange heat with the first refrigerant circulation circuit between the connection point between the refrigerant branch and the first refrigerant circulation circuit and the first heat exchanger.

2. The heat pump system according to claim 1, characterized in that: The heat pump system further includes a second refrigerant circulation loop and a second compressor, the second heat exchanger, a third throttle valve and a third heat exchanger which are sequentially arranged on the second refrigerant circulation loop. The first refrigerant circulation circuit and the second refrigerant circulation circuit exchange heat in the second heat exchanger.

3. The heat pump system according to claim 2, characterized in that: The second heat exchanger includes a first heat exchange device and a second heat exchange device, the first heat exchange device is arranged on the first refrigerant circulation loop, and the second heat exchange device is arranged on the second refrigerant circulation loop. The heat pump system also includes a water circulation loop, a pump device and a water storage tank. The water storage tank, the pump device, the second heat exchange device and the first heat exchange device are sequentially arranged on the water circulation loop.

4. The heat pump system according to any one of claims 1 to 3, characterized in that: The heat pump system also includes a regenerator arranged on the first refrigerant circulation loop, and the regenerator is located between the connection point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger. After passing through the second heat exchanger, the first refrigerant circulation loop passes through the regenerator again and is finally connected to the first compressor. The cooling pipeline is the part of the first refrigerant circulation loop that passes through the regenerator for the second time.

5. The heat pump system according to claim 3, characterized in that: One end of the cooling pipeline is connected to the water circulation loop between the pump device and the second heat exchange device, and the other end of the cooling pipeline is connected to the water storage tank. The connection point between the cooling pipeline, the refrigerant branch and the first refrigerant circulation loop is close to and arranged in parallel with the first refrigerant circulation loop between the first heat exchanger, so that the cooling pipeline and the first refrigerant circulation loop can exchange heat.

6. The heat pump system according to claim 5, characterized in that: The heat pump system also includes a regenerator, which is located on the first refrigerant circulation loop between the connection point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger, and the cooling pipeline and the first refrigerant circulation loop exchange heat through the regenerator.

7. The heat pump system according to claim 1, characterized in that: The cooling pipeline is provided with a regulating valve.

8. The heat pump system according to claim 2, characterized in that: A temperature sensor is provided on the first refrigerant circulation circuit between the connection point between the refrigerant branch and the first refrigerant circulation circuit and the first heat exchanger.

9. The heat pump system according to claim 1 or 2, characterized in that: The heat pump system also includes a water storage tank and a pump device. Both ends of the cooling pipeline are connected to the water storage tank to form a water circulation loop. The pump device is arranged on the water circulation loop, and the cooling pipeline passes through the second heat exchanger.

10. The heat pump system according to claim 1, characterized in that: The heat pump system also includes an economical heat exchanger, which is located on the first refrigerant circulation loop between the connection point between the refrigerant branch and the first refrigerant circulation loop and the first heat exchanger, and the refrigerant branch exchanges heat with the first refrigerant circulation loop through the economical heat exchanger.

11. The heat pump system according to claim 1, characterized in that: The cooling pipeline passes through the second heat exchanger to exchange heat with the first refrigerant circulation loop in the second heat exchanger.

12. The heat pump system according to claim 1, characterized in that: The heat pump system further includes a temperature sensor, which is disposed before the first throttle valve and / or the second throttle valve to detect the temperature of the refrigerant flowing into the first throttle valve and the second throttle valve after being cooled by the cooling pipeline.

13. A heat pump system, characterized in that: The heat pump system comprises a first refrigerant circulation loop and a first compressor, a first heat exchanger, a first throttle valve and a second heat exchanger which are sequentially arranged on the first refrigerant circulation loop; Also includes a cooling pipeline, the cooling pipeline is configured to be able to exchange heat with the first refrigerant circulation loop between the first heat exchanger and the first throttle valve; The cooling pipeline also passes through the second heat exchanger to exchange heat with the first refrigerant circulation loop in the second heat exchanger.

14. The heat pump system according to claim 13, characterized in that: The heat pump system further includes a temperature sensor, which is disposed before the first throttle valve to detect the temperature of the refrigerant flowing into the first throttle valve after being cooled by the cooling pipeline.

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