A heat pump system

Abstract

The present invention belongs to the field of heating technology, and specifically discloses a heat pump system. The heat pump system includes a compressor, a condensation separation component, a first heat exchanger, a first throttling device, a second throttling device and an evaporative condenser. The compressor, the mixed inlet of the condensation separation component, the liquid outlet of the condensation separation component, the first throttling device and the second heat exchange channel are connected end to end in sequence to form a medium circulation pipeline; the gas outlet of the condensation separation component, the first heat exchange channel, the second throttling device, the second channel and the compressor are connected in sequence, and a first branch is connected between the inlet ends of the first heat exchange channel and the second throttling device, the first branch is connected in parallel with the first channel, and the first heat exchange channel is selectively connected with the first channel or the first branch. The heat pump system disclosed in the present invention can improve the energy efficiency of the heat pump system when it is running in a low temperature environment, reduce the exhaust temperature of the compressor when it is running at a low temperature, and improve the operating stability of the heat pump system.

Description

Technical Field

[0001] The invention relates to the technical field of heating, and in particular to a heat pump system. Background Art

[0002] The heat pump system is a device that uses electric heat to obtain heat from heat sources such as air, water or soil and provide users with the required high-quality thermal energy. It is widely used for heating in cold areas in winter.

[0003] Conventional heat pump systems use a single working fluid as a refrigerant to achieve heating. The temperature difference that can be achieved with existing single working fluid heating is about 80°C, that is, when the heating demand temperature is 50°C, the minimum operating ambient temperature of the heat pump system is about -30°C. For some extremely cold regions, the minimum ambient temperature can reach -45°C. When the heating demand temperature and the external ambient temperature differ greatly, a single working fluid heat pump system is difficult to meet the heating demand.

[0004] In order to improve the energy efficiency of the heat pump system, the prior art provides a mixed working fluid heat pump system, which includes a compressor, a condenser, a gas-liquid separation device, a first electronic expansion valve, a condensing evaporator and a second electronic expansion valve. The compressor, the condenser and the gas-liquid separation device are connected in sequence, and the compressor has two working fluids with different boiling points. The two working fluids form a gaseous low-boiling-point working fluid and a liquid high-boiling-point working fluid after condensation and cooling in the condenser and gas-liquid separation in the gas-liquid separation device. The high-boiling-point working fluid flows to the first heat exchange channel of the condensing evaporator after condensation and cooling in the electronic expansion valve, and the gaseous low-boiling-point working fluid flows to the second heat exchange channel of the condensing evaporator, so that the low-boiling-point working fluid and the high-boiling-point working fluid exchange heat at the condensing evaporator, so that the high-boiling-point working fluid is heated up and flows back to the compressor, while the low-boiling-point gas working fluid is cooled and condensed to form a gas-liquid mixed working fluid, and the gas-liquid mixed working fluid is throttled and cooled by the second electronic expansion valve to form a liquid working fluid, and the liquid working fluid flows through the evaporator and flows back to the compressor after heating.

[0005] The mixed refrigerant heat pump system provided by the prior art can increase the energy efficiency of the heat pump system and meet the heating needs by heat exchange between two refrigerants with different boiling points at the condenser evaporator. However, when the external ambient temperature is low, the low-boiling-point refrigerant is difficult to be completely liquefied after passing through the expansion valve, resulting in the low-boiling-point refrigerant absorbing ineffective heat from the external environment through the evaporator, and the temperature is high after returning to the compressor, which in turn leads to a high exhaust temperature of the compressor and a low heating efficiency, affecting the service life of the compressor; at the same time, when the low-boiling-point refrigerant does not absorb enough heat at the evaporator, the refrigerant flowing out of the evaporator will be in a gas-liquid mixed state. After the gas-liquid separation of the gas-liquid mixed state, the low-boiling-point refrigerant returning to the compressor is reduced, increasing the loss of the refrigerant, and further affecting the heating efficiency of the heat pump system. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a heat pump system which can effectively solve the problems of high exhaust temperature and low heating efficiency in existing mixed working fluid heat pump systems under large temperature difference conditions.

[0007] The first technical problem mentioned above is solved by the following technical solution:

[0008] A heat pump system comprises a compressor, a condensation separation component, a first heat exchanger, a first throttling device, a second throttling device and an evaporative condenser, wherein the condensation separation component is used for heat exchange with an external heat supply medium, the condensation separation component has a mixing inlet, a liquid outlet and a gas outlet, the first heat exchanger has a first heat exchange channel and a second heat exchange channel, and the evaporative condenser has a first channel and a second channel;

[0009] The compressor, the mixing inlet, the liquid outlet, the first throttling device and the second heat exchange channel are connected end to end in sequence to form a medium circulation pipeline;

[0010] The gas outlet, the first heat exchange channel, the second throttling device, the second channel and the compressor are connected in sequence, a first branch is connected between the first heat exchange channel and the inlet end of the second throttling device, the first branch is connected in parallel with the first channel, and the first heat exchange channel is selectively connected to the first channel or the first branch.

[0011] The heat pump system described in the present invention has the following beneficial effects compared with the background technology: the first heat exchange channel is selectively connected to the second throttling device through the first branch or the first channel, so that the heat pump system has a first heating mode and a second heating mode, and in the first heating mode and the second heating mode, the second working fluid exchanges heat with the first working fluid at the first heat exchanger, so that the first working fluid is heated up and then flows back to the compressor, avoiding the low temperature of the first working fluid before flowing back to the compressor, resulting in low heating efficiency of the heat pump system, and at the same time, the second working fluid uses the coldness of the first working fluid to condense and cool down, so that the first working fluid flowing to the second throttling device is in liquid form as much as possible, thereby reducing the energy consumption of the second throttling device, and is more conducive to ensuring that the first working fluid is throttled and cooled by the second throttling device. into a fully liquid state, thereby enhancing the heat absorption capacity of the first working fluid in the second channel of the condenser evaporator; when the heat pump system is in the second heating mode, the second working fluids with different temperatures in two paths exchange heat in the second heat exchanger, so that the second working fluid flowing to the inlet end of the second throttling device can be effectively condensed, further reducing the energy consumption required for throttling and cooling by the second throttling device, and ensuring the throttling and cooling effect of the second throttling device on the second working fluid, enhancing the heat exchange efficiency of the second working fluid in the second channel, ensuring that the return air temperature of the second working fluid when flowing back to the compressor is in a more appropriate range, avoiding the problem of excessively high exhaust temperature of the compressor and low refrigeration efficiency due to excessively high return air temperature, and also avoiding the problem of compressor operation failure due to excessively low return air temperature, thereby improving the safety and reliability of the heat pump system.

[0012] That is, the heat pump system provided by the present invention has a first heating mode applicable to scenes with slightly higher ambient temperatures, and a second heating mode applicable to scenes with a large temperature difference between the ambient temperature and the required heating temperature, so that when the external ambient temperature is low and the heating demand temperature is high, the second working fluid can be fully condensed before flowing to the second throttling device and fully absorbed by the second working fluid in the second channel through self-superposition heat exchange between the two second media with different temperatures, thereby avoiding the problem of insufficient heat absorption of the second working fluid before returning to the compressor due to the low ambient temperature, reducing the energy consumption of the compressor, and improving the operating energy efficiency and operating stability of the heat pump system. As a result, it can be better applied to scenes with a large temperature difference between the ambient temperature and the required heating temperature, and can also have better adaptability to low-temperature environments and relatively high-temperature environments, so that the entire heat pump system has strong adaptability to ambient temperature, and the heat pump system has high operating energy efficiency and good operating stability.

[0013] In one embodiment, the heat pump system further includes a second heat exchanger and a second branch, the second heat exchanger has a third heat exchange channel and a fourth heat exchange channel, and the inlet end of the third heat exchange channel is connected to the outlet end of the first heat exchange channel;

[0014] The first branch and the second branch are connected in parallel between the outlet end of the third heat exchange channel and the inlet end of the second throttling device, and the first channel is connected in series to the second branch;

[0015] The outlet end of the second channel is selectively connected to the fourth heat exchange channel.

[0016] In one embodiment, a bypass branch and a heat exchange branch are arranged in parallel between the outlet end of the second channel and the inlet end of the compressor, the fourth heat exchange channel is connected in series to the heat exchange branch, and the heat exchange branch and the bypass branch can be selectively turned on.

[0017] In one embodiment, the outlet end of the second throttling device is connected to one end of the first channel through a shunt bypass pipe, and the other end of the first channel is connected to the heat exchange branch through a converging bypass pipe. A shunt control valve is provided on the shunt bypass pipe, and the shunt control valve controls the opening and closing of the shunt bypass pipe.

[0018] In one embodiment, the outlet end of the second throttling device and the inlet end of the second channel are connected through a connecting pipeline, the second branch includes a downstream pipe section located between the first channel and the second throttling device, and the diversion bypass pipe is connected between the connecting pipeline and the downstream pipe section.

[0019] In one embodiment, the second branch includes an upstream pipe section located between the third heat exchange channel and the first channel, the confluent bypass pipe is connected between the heat exchange branch and the upstream pipe section, and the first channel is selectively connected to the confluent bypass pipe.

[0020] In one embodiment, a first one-way valve is provided on the upstream pipe section, the first one-way valve only allows the medium to flow from the first one-way valve to the first channel, and the first one-way valve is located between the converging bypass pipe and the third heat exchange channel;

[0021] And / or, a confluence control valve is provided on the confluence bypass pipe, and the confluence control valve is used to control the opening and closing of the confluence bypass pipe.

[0022] In one embodiment, the first branch is provided with a first switch valve, the first switch valve controls the on-off of the first branch, and the second branch is provided with a second switch valve, the second switch valve controls the on-off of the second branch;

[0023] And / or, the second branch includes a downstream pipe section between the first channel and the second throttling device, and the downstream pipe section is provided with a second one-way valve, and the second one-way valve only allows the medium to flow to the inlet end of the second throttling device through the second one-way valve;

[0024] And / or, a bypass switch valve is provided on the bypass branch, and the bypass switch valve is used to control the on-off of the bypass branch.

[0025] In one embodiment, a liquid storage container is provided between the inlet end of the second throttling device and the first branch.

[0026] In one embodiment, the condensation separation component includes a separator and a heat exchange condenser arranged inside the separator, the heat exchange condenser is used for heat exchange with the external heating medium, and the separator has the mixing inlet, the liquid outlet and the gas outlet.

[0027] In one embodiment, the heat pump system also includes a first gas-liquid separation device, which has a gas-liquid inlet, a gas separation outlet and a liquid separation outlet. The gas-liquid inlet and the liquid separation outlet are connected in series between the liquid outlet and the first throttling device, and the gas separation outlet is connected to the pipeline between the gas outlet and the first heat exchange channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of working medium flow in a heat pump system provided by an embodiment of the present invention in a first heating mode;

[0029] Figure 2 A schematic diagram of working medium flow in a heat pump system in a second heating mode provided by an embodiment of the present invention.

[0030] Description of labels:

[0031] 1. compressor; 2. condensation separation assembly; 21. separator; 22. heat exchange condenser; 3. first heat exchanger; 31. first heat exchange channel; 32. second heat exchange channel; 4. second heat exchanger; 41. third heat exchange channel; 42. fourth heat exchange channel; 5. evaporative condenser; 51. first channel; 52. second channel; 6. first throttling device; 7. second throttling device; 8. fan;

[0032] 101, first branch; 102, second branch; 1021, upstream pipe section; 1022, downstream pipe section; 103, bypass branch; 104, heat exchange branch; 105, medium circulation pipeline; 106, connecting pipeline; 107, diversion bypass pipe; 108, confluence bypass pipe;

[0033] 201, a first gas-liquid separation device; 202, a second gas-liquid separation device; 203, a liquid storage container;

[0034] 301, first switch valve; 302, second switch valve; 303, bypass switch valve; 304, first one-way valve; 305, second one-way valve; 306, diversion control valve; 307, confluence control valve. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] This embodiment provides a heat pump system, which can be used to heat the indoor environment and better meet the heating demand when the temperature difference between the outdoor environment and the indoor demand environment is large, and improve the operating efficiency and operating stability of the heat pump system.

[0040] like Figure 1 and Figure 2As shown, the heat pump system includes a compressor 1, a condensation separation component 2, a first heat exchanger 3, a first throttling device 6, a second throttling device 7 and an evaporative condenser 5. The condensation separation component 2 is used for heat exchange with an external heat supply medium. The condensation separation component 2 has a mixing inlet, a liquid outlet and a gas outlet. The first heat exchanger 3 has a first heat exchange channel 31 and a second heat exchange channel 32. The evaporative condenser 5 has a first channel 51 and a second channel 52; the compressor 1, the mixing inlet, the liquid outlet, the first throttling device 6 and the second heat exchange channel 32 are connected end to end in sequence to form a medium circulation pipeline 105; the gas outlet, the first heat exchange channel 31, the second throttling device 7, the second channel 52 and the compressor 1 are connected in sequence, and a first branch 101 is connected between the inlet ends of the first heat exchange channel 31 and the second throttling device 7. The first branch 101 is connected in parallel with the first channel 51, and the first heat exchange channel 31 is selectively connected to the first channel 51 or the first branch 101.

[0041] The compressor 1 contains a first working fluid and a second working fluid with different boiling points. The heat pump system provided in this embodiment has a first heating mode and a second heating mode.

[0042] like Figure 1 As shown, when the heat pump system is in the first heating mode, the first heat exchange channel 31, the first branch 101 and the second throttling device 7 are connected in sequence. The compressor 1 is working, and the mixed medium of the first working fluid and the second working fluid is compressed in the compressor 1 to form a high-temperature and high-pressure gas, and then discharged from the compressor 1, and enters the condensation separation component 2 through the mixed inlet; the mixed medium exchanges heat with the external heating medium in the condensation separation component 2, the external heating medium heats up to heat up or keep the indoor environment warm, and the mixed medium releases heat to cool down. Since the mixed medium contains the first working fluid and the second working fluid with different boiling points, the first working fluid with a high boiling point becomes a medium-temperature liquid medium after condensation and cooling. The medium-temperature liquid medium flows out of the condensation separation component 2 through the liquid outlet and flows to the first throttling device 6 through the medium circulation pipeline 105, and becomes a low-temperature gas-liquid mixture medium after throttling and cooling by the first throttling device 6; when the low-temperature gas-liquid mixture medium flows through the second heat exchange channel 32, it exchanges heat with the second working fluid flowing through the first heat exchange channel 31, and the low-temperature liquid first working fluid absorbs heat and flows back to the compressor 1 to realize the circulation flow of the first working fluid.

[0043] Since the boiling point of the second working fluid is relatively low, the second working fluid after heat exchange and cooling in the condensation separation component 2 basically flows out through the gas outlet in a gaseous form and flows to the first heat exchange channel 31. The gaseous second working fluid is heat exchanged and condensed by the second working fluid in the second heat exchange channel 32 in the first heat exchange channel 31 to form a low-temperature gas-liquid mixture medium. The low-temperature gas-liquid mixture medium flows to the second throttling device 7 through the first branch 101, and is throttled and cooled by the second throttling device 7 to form a fully liquid low-temperature medium. The low-temperature medium absorbs heat and heats up in the condenser evaporator and then flows back to the compressor 1.

[0044] like Figure 2 As shown, when the heat pump system is in the second heating mode, the first heat exchange channel 31, the first channel 51 and the second throttling device 7 are connected in sequence. Among them, when the heat pump system is in the second heating mode, the circulation flow and heat absorption and heat release state of the first working fluid in the medium circulation pipeline 105 are basically the same as when the heat pump system is in the first heating mode, and will not be repeated here.

[0045] When the heat pump system is in the second heating mode, the second working medium with a low boiling point flows out through the gas outlet in a gaseous form and flows to the first heat exchange channel 31, and then exchanges heat with the first working medium in the second heat exchange channel 32 in the first heat exchange channel 31 and cools down; the low-temperature gas-liquid mixture medium flowing out of the first heat exchange channel 31 flows to the first channel 51, and exchanges heat with the second working medium in the second channel 52. Since the second medium in the first channel 51 is a medium that has not been throttled and cooled by the second throttling device 7, and the second medium in the second channel 52 is a completely liquid medium that has been throttled and cooled by the second throttling device 7, the first channel 51 is a medium that has not been throttled and cooled by the second throttling device 7. The temperature of the second medium in the first channel 51 and the second channel 52 is different. The low-temperature gas-liquid mixture medium in the first channel 51 releases heat and condenses, further reducing the temperature; then it flows to the second throttling device 7 through the second branch 102, and is throttled and cooled by the second throttling device 7 to form a low-temperature liquid medium that is fully liquid and has a lower temperature; the throttled and cooled low-temperature liquid medium flows to the second channel 52, and exchanges heat with the second working medium in the first channel 51 before throttling and cooling. The low-temperature liquid medium in the second channel 52 absorbs heat and heats up to become a medium-low temperature gas and then flows back to the compressor 1, thereby realizing the circulation of the second working medium.

[0046] That is, in the heat pump system provided by the present embodiment, in the first heating mode and the second heating mode, the second working fluid exchanges heat with the first working fluid at the first heat exchanger 3, so that the first working fluid is heated and then flows back to the compressor 1, so as to avoid the first working fluid being too low in temperature before flowing back to the compressor 1, thereby causing low heating efficiency of the heat pump system. At the same time, the second working fluid uses the cooling capacity of the first working fluid to condense and cool down, so that the first working fluid flowing to the second throttling device 7 is in liquid form as much as possible, thereby reducing the energy consumption of the second throttling device 7, and is more conducive to ensuring that the first working fluid is fully liquid after being throttled and cooled by the second throttling device 7, thereby enhancing the heat absorption capacity of the first working fluid at the second channel 52 of the condenser evaporator; in the heat pump system When the system is in the second heating mode, the second working fluids with different temperatures in two paths exchange heat in the second heat exchanger 4, so that the second working fluid flowing to the inlet end of the second throttling device 7 can be effectively condensed, further reducing the energy consumption required for throttling and cooling of the second throttling device 7, and ensuring the throttling and cooling effect of the second throttling device 7 on the second working fluid, enhancing the heat exchange efficiency of the second working fluid in the second channel 52, and ensuring that the return air temperature of the second working fluid when flowing back to the compressor 1 is in a more appropriate range, avoiding the problem of excessively high exhaust temperature of the compressor 1 and low refrigeration efficiency due to excessively high return air temperature, and also avoiding the problem of operating failure of the compressor 1 due to excessively low return air temperature, thereby improving the safety and reliability of the heat pump system.

[0047] That is, the heat pump system provided in this embodiment has a first heating mode applicable to scenes with slightly higher ambient temperatures, and a second heating mode applicable to scenes with a large temperature difference between the ambient temperature and the required heating temperature, so that when the external ambient temperature is low and the heating demand temperature is high, the second working fluid can be fully condensed before flowing to the second throttling device 7 and fully absorbed by the second working fluid in the second channel 52 through self-superposition heat exchange between the two second media with different temperatures, thereby avoiding the problem of insufficient heat absorption of the second working fluid before returning to the compressor 1 due to the low ambient temperature, reducing the energy consumption of the compressor 1, and improving the operating energy efficiency and operating stability of the heat pump system. That is, the heat pump system provided in this embodiment can be better applied to scenes with a large temperature difference between the ambient temperature and the required heating temperature, and can also have good adaptability to low-temperature environments and relatively high-temperature environments, so that the entire heat pump system has strong adaptability to ambient temperature, and the heat pump system has high operating energy efficiency and good operating stability.

[0048] When the external environment temperature is lower than the first preset temperature, the heat pump system performs the first heating mode, and when the external environment temperature is higher than the preset temperature, the heat pump system performs the second heating mode. In one embodiment, the preset temperature is 0°C to 8°C.

[0049] It is worth noting that the types of the first working fluid and the second working fluid can be selected based on the ambient temperature range to be used and the achievable heating temperature range of the heat pump system. The selection method of the first working fluid and the second working fluid can refer to the prior art. This is not the focus of the present invention and will not be repeated here.

[0050] In one embodiment, the heat pump system also includes a second heat exchanger 4 and a second branch 102, the second heat exchanger 4 has a third heat exchange channel 41 and a fourth heat exchange channel 42, the inlet end of the third heat exchange channel 41 is connected to the outlet end of the first heat exchange channel 31; the first branch 101 and the second branch 102 are connected in parallel between the outlet end of the third heat exchange channel 41 and the inlet end of the second throttling device 7, and the first channel 51 is connected in series to the second branch 102; the outlet end of the second channel 52 is selectively connected to the fourth heat exchange channel 42.

[0051] The above arrangement enables, when the heat pump system is in the first heating mode, the second working fluid flowing out of the second channel 52 to flow to the fourth heat exchange channel 42, so that the two second working fluids with different temperatures can exchange heat at the second heat exchanger 4, thereby enabling the second working fluid in the third heat exchange channel 41 to be further condensed and cooled, while the second working fluid in the fourth heat exchange channel 42 can be heated, thereby further enhancing the condensation effect and the temperature of the second medium before flowing to the second throttling device 7 through self-superposition heat exchange of the two second working fluids at the second heat exchanger 4, thereby reducing the energy consumption required for throttling and cooling of the second throttling device 7, and being more conducive to ensuring that the second working fluid after throttling and cooling from the second throttling device 7 is in a completely liquid state.

[0052] To facilitate the selective passage of the second channel 52 and the fourth heat exchange channel 42, in one embodiment, a bypass branch 103 and a heat exchange branch 104 are arranged in parallel between the outlet end of the second channel 52 and the inlet end of the compressor 1, and the fourth heat exchange channel 42 is connected in series to the heat exchange branch 104, and the heat exchange branch 104 and the bypass branch 103 can both be selectively conducted.

[0053] In one embodiment, the outlet end of the second throttling device 7 is connected to one end of the first channel 51 through a diverter bypass pipe 107, and the other end of the first channel 51 is connected to the heat exchange branch 104 through a converging bypass pipe 108. A diverter control valve 306 is provided on the diverter bypass pipe 107, and the diverter control valve 306 controls the opening and closing of the diverter bypass pipe 107.

[0054] This arrangement allows the second working fluid flowing out of the second throttling device 7 to flow only through the second channel 52 to the fourth heat exchange channel 42, or to flow through the first channel 51 and the second channel 52 to the fourth heat exchange channel 42, by controlling the on-off of the diverter bypass pipe 107 when the heat pump system is in the first heating mode, thereby adjusting the heat exchange efficiency between the second working fluid and the external air at the condensing heat exchanger.

[0055] It is worth noting that when the external ambient temperature is relatively high, the diverter control valve 306 closes the diverter bypass pipe 107, thereby enabling the second working fluid to exchange heat with the external air only through the second channel 52, thereby ensuring the heat absorption effect while reducing the amount of the second working fluid circulating in the entire heat pump system, thereby reducing the overall energy consumption of the heat pump system; when the external ambient temperature is relatively low, the diverter control valve 306 opens the diverter bypass pipe 107, so that the second working fluid flowing out of the second throttling device 7 can flow to the first channel 51 and the second channel 52 respectively, thereby enhancing the heat absorption effect of the second working fluid with the external environment at the condensing heat exchanger, thereby ensuring the return air temperature of the second working fluid.

[0056] Further, when the external environment temperature is between the first preset temperature and the second preset temperature, the diversion control valve 306 is opened, and the second preset temperature is higher than the first preset temperature; when the external environment temperature is higher than the second preset temperature, the diversion control valve 306 is closed. The second preset temperature is 5°C to 10°C.

[0057] like Figure 1 and Figure 2 As shown, in one embodiment, the condensation separation component 2 includes a separator 21 and a heat exchange condenser 22 disposed inside the separator 21. The heat exchange condenser 22 is used to perform heat exchange with an external heat supply medium. The separator 21 has a mixing inlet, a liquid outlet, and a gas outlet. This arrangement can simplify the structure of the condensation subassembly, reduce the floor space of the condensation separation component 2, and enhance the condensation effect of the condensation separation component 2 on the working medium after heat exchange.

[0058] In other embodiments, the condensation separation component 2 may include a condenser and a separator arranged in series, wherein the condenser is located between the outlet end of the compressor 1 and the separator, the inlet end of the condenser forms a mixed inlet, and the above-mentioned liquid outlet and gas outlet are arranged on the separator.

[0059] Since the first working medium flowing out of the liquid outlet may carry part of the gaseous second working medium, in one embodiment, the heat pump system further includes a first gas-liquid separation device 201, which has a gas-liquid inlet, a gas separation outlet and a liquid separation outlet. The gas-liquid inlet is connected to the liquid outlet of the condensation separation component 2, and the liquid separation outlet is connected to the inlet end of the first throttling device 6, that is, the gas-liquid inlet and the liquid separation outlet are connected to the medium circulation pipeline 105. The gas separation outlet is connected to the pipeline between the condensation separation component 2 and the first heat exchange channel 31, so that the separated gas can merge with the second working medium flowing out of the gas outlet. By setting the first gas-liquid separation device 201, the separation of the liquid first working medium and the gaseous second working medium can be better achieved, so that the gaseous first working medium can absorb more heat, thereby improving the overall energy efficiency of the heat pump system.

[0060] The first gas-liquid separation device 201 is a high-pressure separator. The specific structure of the first gas-liquid separation device 201 can be set with reference to the prior art and is not limited here.

[0061] In one embodiment, the heat pump system also includes a second gas-liquid separation device 202, which is connected in series between the compressor 1 and the second heat exchange channel 32, so that the low-temperature gaseous first working fluid after heat exchange through the second heat exchange channel 32 can enter the compressor 1 after gas-liquid separation, thereby improving the operating reliability of the compressor 1.

[0062] Furthermore, the intersection of the inlet end of the bypass branch 103 and the inlet end of the heat exchange branch 104 is set as the inlet intersection, and the intersection of the outlet end of the bypass branch 103 and the outlet end of the heat exchange branch 104 is set as the outlet intersection. The outlet intersection, the second gas-liquid separation device 202 and the inlet end of the compressor 1 are connected in sequence, so that the second working fluid flowing out from the bypass branch 103 or the heat exchange branch 104 passes through the second gas-liquid separation device 202 for gas-liquid separation before returning to the compressor 1, thereby improving the operating reliability of the compressor 1, and allowing the gas-liquid separation of the first working fluid and the second working fluid to share a gas-liquid separation device, reducing the number of required gas-liquid separation devices and reducing the piping complexity of the heat pump system.

[0063] Furthermore, the outlet intersection is connected to the medium circulation pipeline 105 through a connecting pipe, and the connection point is located between the second gas-liquid separation device 202 and the second heat exchange channel 32 .

[0064] In order to better realize the selective opening and closing of the first branch 101 and the second branch 102, in one embodiment, a first switch valve 301 is provided on the first branch 101, and a second switch valve 302 is provided on the second branch 102. The first switch valve 301 is used to control the opening and closing of the first branch 101, and the second switch valve 302 is used to control the opening and closing of the second branch 102. In other embodiments, a three-way valve may be used to connect the first branch 101, the second branch 102 and the third heat exchange channel 41, so as to realize the selective opening and closing of the third heat exchange channel 41 with the first branch 101 and the second branch 102 through the three-way valve.

[0065] The second branch 102 includes an upstream pipe section 1021 located between the third heat exchange channel 41 and the first channel 51 and a downstream pipe section 1022 located between the first channel 51 and the intersection of the branches. The second switch valve 302 is disposed on the first branch 101 to prevent the fluid flowing out of the third heat exchange channel 41 from entering the first channel 51, thereby reducing the loss of the second working fluid in the second branch 102 when the first branch 101 is turned on.

[0066] The intersection between the outlet end of the first branch 101 and the outlet end of the downstream pipe section 1022 is set as the branch intersection. In one embodiment, a second one-way valve 305 is provided at the downstream pipe section 1022. The second one-way valve 305 only allows the fluid to flow from the first channel 51 to the branch intersection, thereby preventing the second working fluid flowing out of the first branch 101 from flowing into the downstream pipe section 1022 through the branch intersection, thereby improving the operating stability and reliability of the heat pump system.

[0067] In order to further improve the performance of the heat pump system, a liquid storage container 203 is connected in series between the first branch 101 and the inlet end of the second throttling device 7. The liquid storage container 203 is used to separate the gas and liquid of the second working fluid flowing to the second throttling device 7 to ensure that the second working fluid entering the second throttling device 7 is in liquid state, thereby ensuring the operating reliability and efficiency of the second throttling device 7.

[0068] In order to simplify the piping of the heat pump system, the second channel 52 and the second throttling device 7 are connected through the connecting pipe 106, and the shunt bypass pipe 107 is connected between the connecting pipe 106 and the downstream pipe section 1022. As a result, the second working fluid flowing out of the second throttling device 7 can partially pass through the shunt bypass pipe 107 and part of the second branch 102 into the first channel 51, and flow to the heat exchange branch 104 through the converging bypass pipe 108. Furthermore, the shunt bypass pipe 107 is arranged close to the first channel 51 to shorten the medium flow path from the shunt bypass pipe 107 to the first channel 51, thereby reducing the resistance of the medium from the shunt bypass pipe 107 to the first channel 51, and preventing the medium flowing out of the shunt bypass pipe 107 from flowing to the intersection of the branches.

[0069] In one embodiment, the confluent bypass pipe 108 is connected between the heat exchange branch 104 and the upstream pipe section 1021, and the first channel 51 is selectively connected to the confluent bypass pipe 108. This helps to simplify the piping of the heat pump system.

[0070] The confluence bypass pipe 108 is provided with a confluence control valve 307, which controls the opening and closing of the confluence bypass pipe 108, thereby preventing the second working fluid flowing from the upstream pipe section 1021 to the first channel 51 from entering the heat exchange branch 104 through the confluence bypass pipe 108 in the second heating mode.

[0071] In one embodiment, a first one-way valve 304 is provided on the upstream pipe section 1021. The first one-way valve 304 only allows the fluid to flow to the first channel 51 through the first one-way valve 304. The first one-way valve 304 is located between the confluent bypass pipe 108 and the third heat exchange channel 41. In this way, the fluid flowing out of the first channel 51 can be restricted from flowing to the heat exchange branch 104 through the upstream pipe section 1021 in the first heating mode, thereby ensuring the reliability of the second working medium flow path. Further, the first one-way valve 304 is located between the connection point between the confluent bypass pipe 108 and the upstream pipe section 1021 and the second switch valve 302.

[0072] In order to realize the selective passage of the bypass branch 103 and the heat exchange branch 104, in one embodiment, the bypass branch 103 is shorter than the heat exchange branch 104, and a bypass switch valve 303 is provided on the bypass branch 103, and the bypass switch valve 303 is used to control the on-off of the bypass branch 103. Therefore, when the bypass switch valve 303 conducts the bypass branch 103, the second working fluid flowing out of the evaporative condenser 5 will flow to the bypass branch 103 due to the reduction of the flow resistance in the bypass branch 103. In other embodiments, a fourth switch valve can also be provided on the heat exchange branch 104, and the fourth switch valve is located between the second channel 52 and the fourth heat exchange channel 42.

[0073] In one embodiment, a fan 8 is provided on one side of the evaporative condenser 5 close to the second channel 52 to facilitate guiding the air flow near the evaporative condenser 5 , thereby enhancing the absorption of heat in the air by the second working fluid when flowing in the second channel 52 .

[0074] Furthermore, both the first throttling device 6 and the second throttling device 7 are electronic expansion valves. In other embodiments, the first throttling device 6 and / or the second throttling device 7 may also be other structures capable of achieving medium throttling and cooling.

[0075] The first switch valve 301, the second switch valve 302, the bypass switch valve 303, the diversion control valve 306 and the confluence control valve 307 are all solenoid valves to improve the control convenience and control reliability of each valve.

[0076] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A heat pump system, characterized in that: The invention comprises a compressor (1), a condensation separation component (2), a first heat exchanger (3), a first throttling device (6), a second throttling device (7), a first branch (101) and an evaporative condenser (5); the condensation separation component (2) is used for performing heat exchange with an external heat supply medium; the condensation separation component (2) has a mixing inlet, a liquid outlet and a gas outlet; the first heat exchanger (3) has a first heat exchange channel (31) and a second heat exchange channel (32); and the evaporative condenser (5) has a first channel (51) and a second channel (52); The compressor (1), the mixing inlet, the liquid outlet, the first throttling device (6) and the second heat exchange channel (32) are connected end to end in sequence to form a medium circulation pipeline (105); The gas outlet, the first heat exchange channel (31), the first branch (101), the second throttling device (7), the second channel (52) and the compressor (1) are connected in sequence; the first branch (101) is connected in parallel with the first channel (51); and the first heat exchange channel (31) is selectively connected with the first channel (51) or the first branch (101).

2. The heat pump system according to claim 1, characterized in that: The heat pump system further comprises a second heat exchanger (4) and a second branch (102); the second heat exchanger (4) comprises a third heat exchange channel (41) and a fourth heat exchange channel (42); the inlet end of the third heat exchange channel (41) is connected to the outlet end of the first heat exchange channel (31); The first branch (101) and the second branch (102) are connected in parallel between the outlet end of the third heat exchange channel (41) and the inlet end of the second throttling device (7), and the first channel (51) is connected in series to the second branch (102); The outlet end of the second channel (52) is selectively connected to the fourth heat exchange channel (42).

3. The heat pump system according to claim 2, characterized in that: A bypass branch (103) and a heat exchange branch (104) are arranged in parallel between the outlet end of the second channel (52) and the inlet end of the compressor (1), the fourth heat exchange channel (42) is connected in series to the heat exchange branch (104), and both the heat exchange branch (104) and the bypass branch (103) can be selectively conducted.

4. The heat pump system according to claim 3, characterized in that: The outlet end of the second throttling device (7) is connected to one end of the first channel (51) via a shunt bypass pipe (107), and the other end of the first channel (51) is connected to the heat exchange branch (104) via a confluence bypass pipe (108). A shunt control valve (306) is provided on the shunt bypass pipe (107), and the shunt control valve (306) controls the on-off of the shunt bypass pipe (107).

5. The heat pump system according to claim 4, characterized in that: The outlet end of the second throttling device (7) and the inlet end of the second channel (52) are connected via a connecting pipeline (106); the second branch (102) comprises a downstream pipe section (1022) located between the first channel (51) and the second throttling device (7); and the flow-dividing bypass pipe (107) is connected between the connecting pipeline (106) and the downstream pipe section (1022).

6. The heat pump system according to claim 4, characterized in that: The second branch (102) comprises an upstream pipe section (1021) located between the third heat exchange channel (41) and the first channel (51), the confluent bypass pipe (108) is connected between the heat exchange branch (104) and the upstream pipe section (1021), and the first channel (51) is selectively connected to the confluent bypass pipe (108).

7. The heat pump system according to claim 6, characterized in that: A first one-way valve (304) is provided on the upstream pipe section (1021), the first one-way valve (304) only allowing the medium to flow from the first one-way valve (304) to the first channel (51), and the first one-way valve (304) is located between the converging bypass pipe (108) and the third heat exchange channel (41); And / or, a confluence control valve (307) is provided on the confluence bypass pipe (108), and the confluence control valve (307) is used to control the opening and closing of the confluence bypass pipe (108).

8. The heat pump system according to claim 3, characterized in that: The first branch (101) is provided with a first switch valve (301), the first switch valve (301) controls the on-off of the first branch (101), and the second branch (102) is provided with a second switch valve (302), the second switch valve (302) controls the on-off of the second branch (102); And / or, the second branch (102) comprises a downstream pipe section (1022) located between the first channel (51) and the second throttling device (7), the downstream pipe section (1022) being provided with a second one-way valve (305), the second one-way valve (305) only allowing the medium to flow through the second one-way valve (305) to the inlet end of the second throttling device (7); And / or, a bypass switch valve (303) is provided on the bypass branch (103), and the bypass switch valve (303) is used to control the on-off of the bypass branch (103).

9. The heat pump system according to any one of claims 1 to 7, characterized in that: A liquid storage container (203) is provided between the inlet end of the second throttling device (7) and the first branch (101).

10. The heat pump system according to any one of claims 1 to 7, characterized in that: The condensation separation component (2) comprises a separator (21) and a heat exchange condenser (22) arranged inside the separator (21), the heat exchange condenser (22) being used for performing heat exchange with the external heat supply medium, and the separator (21) having the mixing inlet, the liquid outlet and the gas outlet.

11. The heat pump system according to any one of claims 1 to 7, characterized in that: The heat pump system further comprises a first gas-liquid separation device (201), the first gas-liquid separation device (201) having a gas-liquid inlet, a gas separation outlet and a liquid separation outlet, the gas-liquid inlet and the liquid separation outlet being connected in series between the liquid outlet and the first throttling device (6), and the gas separation outlet being connected to a pipeline between the gas outlet and the first heat exchange channel (31).

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