Heat pump system and heat pump unit

Abstract

This utility model relates to the field of heat pump technology and discloses a heat pump system and a heat pump unit. The D port of the four-way valve in this heat pump system is connected to the exhaust port of the second compressor; the S port of the four-way valve is connected to the suction port of the first compressor; the water-side heat exchanger has a refrigerant flow channel inside; the C port of the four-way valve is connected to one end of the refrigerant flow channel; one end of the air-side heat exchanger is connected to the other end of the refrigerant flow channel, and the other end of the air-side heat exchanger is connected to the E port of the four-way valve; the first valve body assembly has a first conducting state and a second conducting state; in the first conducting state, the refrigerant discharged from the exhaust port of the first compressor enters the suction port of the second compressor; in the second conducting state, the refrigerant discharged from the exhaust port of the first compressor enters the D port of the four-way valve. By setting the first valve body assembly, the problems of high power consumption, wasted heating capacity, and low operating efficiency of existing two-stage compression heat pump systems during operation in non-extremely cold weather can be solved.

Description

Technical Field

[0001] This utility model relates to the field of heat pump technology, and in particular to a heat pump system and a heat pump unit. Background Technology

[0002] With the increasing variability of the climate, extreme weather has become more frequent in recent years, especially in extremely cold weather (such as temperatures below -30 degrees Celsius). In order to ensure that the output hot water temperature can be higher than 45 degrees Celsius, bi-stage compression is usually used to increase the system pressure ratio, thereby increasing the system's heating capacity. However, when this bi-stage compression system is running in non-extremely cold weather, it has problems such as high power consumption and wasted heating capacity, resulting in low system operating efficiency.

[0003] Therefore, how to ensure that two-stage compression heat pump systems can operate efficiently under different environmental conditions is an urgent problem that the industry needs to solve. Utility Model Content

[0004] This utility model provides a heat pump system and heat pump unit to solve the problems of high power consumption, waste of heating capacity, and low operating efficiency of existing two-stage compression heat pump systems when operating in non-extremely cold weather.

[0005] The first aspect of this utility model provides a heat pump system, comprising: First compressor and second compressor; A four-way valve, wherein the D port of the four-way valve is connected to the exhaust port of the second compressor; and the S port of the four-way valve is connected to the intake port of the first compressor. The water-side heat exchanger has a refrigerant flow channel inside; the C port of the four-way valve is connected to one end of the refrigerant flow channel; The air-side heat exchanger is connected at one end to the other end of the refrigerant flow channel and at the other end to the E port of the four-way valve. The first valve body assembly has a first conducting state and a second conducting state; in the first conducting state, the refrigerant discharged from the exhaust port of the first compressor enters the suction port of the second compressor; in the second conducting state, the refrigerant discharged from the exhaust port of the first compressor enters the D port of the four-way valve.

[0006] According to the heat pump system provided by this utility model, the first valve body assembly includes: A first switching valve, one end of which is connected to the exhaust port of the first compressor, and the other end of which is connected to the intake port of the second compressor; The second switching valve has one end connected to one end of the first switching valve, and the other end connected to the exhaust port of the second compressor and the D port of the four-way valve.

[0007] According to the heat pump system provided by this utility model, the first valve body assembly includes a three-way reversing valve; the inlet of the three-way reversing valve is connected to the exhaust port of the first compressor, the first outlet of the three-way reversing valve is connected to the suction port of the second compressor, and the second outlet of the three-way reversing valve is connected to the exhaust port of the second compressor and the D port of the four-way valve.

[0008] The heat pump system provided by this utility model also includes: At the user terminal, a water flow channel is formed inside the water-side heat exchanger. The two ends of the water flow channel are connected to the inlet and outlet of the user terminal, respectively, to form a water circulation loop.

[0009] The heat pump system provided by this utility model also includes: A temperature detection component is used to detect the inlet water temperature of the water-side heat exchanger; The controller is electrically connected to the temperature detection component.

[0010] The heat pump system provided by this utility model also includes: The first check valve connects the exhaust port of the second compressor to the D port of the four-way valve.

[0011] The heat pump system provided by this utility model also includes: A heating element is disposed at the suction port of the first compressor and is used to raise the refrigerant temperature at the suction port of the first compressor.

[0012] According to the heat pump system provided by this utility model, the heating component includes: The heating element is located on the outside of the suction pipe and in contact with the suction pipe, and is used to heat the refrigerant inside the suction pipe.

[0013] According to the heat pump system provided by this utility model, the heating element includes an electric heating resistance wire or a heating tube.

[0014] The second aspect of this utility model provides a heat pump unit, including the heat pump system described in any of the above claims.

[0015] The heat pump system provided by this utility model features a first valve assembly with a first and a second conducting state. In the first conducting state, gaseous refrigerant discharged from the exhaust port of the first compressor is drawn into the suction port of the second compressor, undergoes a second compression in the second compressor, and is finally discharged from the exhaust port of the second compressor. It then flows through a four-way valve to the refrigerant channel of the water-side heat exchanger. This dual-stage compression of the refrigerant by both the first and second compressors is suitable for heating in low-temperature environments, ensuring that the heat pump system can still output high-temperature hot water to meet user needs even at low ambient temperatures. In the second conducting state, the gaseous refrigerant discharged from the exhaust port of the first compressor does not undergo further compression by the second compressor but flows directly through the four-way valve to the refrigerant channel of the water-side heat exchanger. This means the refrigerant is compressed only by the first compressor, suitable for heating needs in high-temperature environments, avoiding waste of heating capacity and reducing power consumption. In summary, by incorporating the first valve assembly, the heat pump system can switch between dual-stage and single-stage compression based on the ambient temperature, meeting user heating needs while avoiding waste of cooling capacity, ensuring efficient operation of the system under various ambient temperature conditions. This invention solves the problems of high power consumption, wasted heating capacity, and low operating efficiency of existing two-stage compression heat pump systems when operating in non-extremely cold weather.

[0016] The heat pump unit provided by this utility model includes the above-mentioned heat pump system, and therefore has at least the above-mentioned advantages. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is one of the structural schematic diagrams of the heat pump system provided by this utility model.

[0019] Figure 2 This is the second structural schematic diagram of the heat pump system provided by this utility model.

[0020] Figure 3 This is a schematic diagram of the heating element of the heat pump system provided by this utility model.

[0021] Figure 4 This is the third structural schematic diagram of the heat pump system provided by this utility model.

[0022] Figure 5 This is the fourth structural schematic diagram of the heat pump system provided by this utility model.

[0023] Figure 6 This is the fifth schematic diagram of the heat pump system provided by this utility model.

[0024] Figure 7 This is an equivalent circuit diagram of the first water pump module and the second water pump module of the heat pump system provided by this utility model.

[0025] Figure label: 110. First compressor; 120. Second compressor; 130. First check valve; 200, Four-way valve; 300, Water-side heat exchanger; 400, Air-side heat exchanger; 500, First valve body assembly; 510, First switching valve; 520, Second switching valve; 610. First heat exchanger; 620. Second throttling assembly; 630. First air supply pipe; 640. Third throttling assembly; 650. Second air supply pipe; 660. Second one-way valve; 700, User Terminal; 810. Second heat exchanger; 820. Heating element; 900. First throttling component; 12. First water pump module; 13. First valve body; 14. First reserved interface; 15. Second reserved interface; 16. Second water pump module; 17. Second switch module; 18. Power supply. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] The following is combined Figures 1 to 7 The heat pump system provided by this utility model is described in detail.

[0030] like Figure 1 and Figure 2 As shown, a specific embodiment of the first aspect of this utility model provides a heat pump system. The heat pump system includes a first compressor 110, a second compressor 120, a four-way valve 200, a water-side heat exchanger 300, an air-side heat exchanger 400, and a first valve body assembly 500. The D port of the four-way valve 200 is connected to the exhaust port of the second compressor 120; the S port of the four-way valve 200 is connected to the suction port of the first compressor 110; the water-side heat exchanger 300 has a refrigerant flow channel inside; the C port of the four-way valve 200 is connected to one end of the refrigerant flow channel; one end of the air-side heat exchanger 400 is connected to the other end of the refrigerant flow channel, and the other end of the air-side heat exchanger 400 is connected to the E port of the four-way valve 200; the first valve body assembly 500 has a first conducting state and a second conducting state; in the first conducting state, the refrigerant discharged from the exhaust port of the first compressor 110 enters the suction port of the second compressor 120; in the second conducting state, the refrigerant discharged from the exhaust port of the first compressor 110 enters the D port of the four-way valve 200.

[0031] In this embodiment, by setting a first valve body assembly 500 with a first conducting state and a second conducting state, in the first conducting state, the gaseous refrigerant discharged from the exhaust port of the first compressor 110 is drawn into the suction port of the second compressor 120, undergoes a second compression by the second compressor 120, and is finally discharged from the exhaust port of the second compressor 120. It then flows through the four-way valve 200 to the refrigerant channel of the water-side heat exchanger 300. Thus, the refrigerant is compressed successively by the first compressor 110 and the second compressor 120, achieving two-stage compression of the refrigerant, suitable for heating in low-temperature environments, ensuring that even at low ambient temperatures, the heat pump system can still output high-temperature hot water to meet user needs. In the second conducting state, the gaseous refrigerant discharged from the exhaust port of the first compressor 110 does not undergo further compression by the second compressor 120, but flows directly through the four-way valve 200 to the refrigerant channel of the water-side heat exchanger 300. Thus, the refrigerant is only compressed by the first compressor 110, suitable for heating needs in high-temperature environments, avoiding waste of heating capacity and reducing power consumption. In summary, by setting the first valve body assembly 500, the heat pump system can switch between two-stage compression and single-stage compression according to the ambient temperature. This satisfies the user's heating needs while avoiding waste of cooling capacity, ensuring that the system can operate efficiently under different ambient temperature conditions. This solves the problems of high power consumption, wasted heating capacity, and low operating efficiency in existing two-stage compression heat pump systems operating in non-extremely cold weather.

[0032] In some embodiments, the first valve body assembly 500 includes a first switching valve 510 and a second switching valve 520; one end of the first switching valve 510 is connected to the exhaust port of the first compressor 110, and the other end of the first switching valve 510 is connected to the intake port of the second compressor 120; one end of the second switching valve 520 is connected to one end of the first switching valve 510, and the other end of the second switching valve 520 is connected to the exhaust port of the second compressor 120.

[0033] In this embodiment, when the first switching valve 510 is closed and the second switching valve 520 is open, the gaseous refrigerant discharged from the exhaust port of the first compressor 110 flows directly through the four-way valve 200 to the refrigerant channel of the water-side heat exchanger 300 via the second switching valve 520. At this time, the heat pump system is in a single-stage compression state. When the first switching valve 510 is open and the second switching valve 520 is closed, the gaseous refrigerant discharged from the exhaust port of the first compressor 110 is drawn into the suction port of the second compressor 120 after passing through the first switching valve 510. After being compressed again by the second compressor 120, it is discharged from the exhaust port of the second compressor 120 and then enters the refrigerant channel of the water-side heat exchanger 300 via the four-way valve 200. At this time, the heat pump system is in a two-stage compression state.

[0034] In some other embodiments, the first valve body assembly 500 includes a three-way reversing valve. The inlet of the three-way reversing valve is connected to the outlet of the first compressor 110, and the first outlet of the three-way reversing valve is connected to the suction port of the second compressor 120; the second outlet of the three-way reversing valve is connected to the exhaust port of the second compressor 120. Specifically, in the first open state, the inlet of the three-way reversing valve is connected to the first outlet, allowing gaseous refrigerant discharged from the exhaust port of the first compressor 110 to be drawn into the second compressor 120 after passing through the three-way reversing valve and undergoing secondary compression. In the second open state, the inlet of the three-way reversing valve is connected to the second outlet, allowing gaseous refrigerant discharged from the exhaust port of the first compressor 110 to directly enter the four-way reversing valve after passing through the three-way reversing valve, instead of being drawn into the second compressor 120, thus achieving single-stage compression of the refrigerant.

[0035] Optionally, the first switching valve 510 includes, but is not limited to, at least one of a solenoid valve, a ball valve, and a throttle valve.

[0036] Optionally, the second switching valve 520 includes, but is not limited to, at least one of a solenoid valve, a ball valve, and a throttle valve.

[0037] In one embodiment, the heat pump system further includes a first one-way valve 130. The exhaust port of the second compressor 120 is connected to port D of the four-way valve 200 through the first one-way valve 130. The first one-way valve 130 at the exhaust port of the second compressor 120 prevents refrigerant from flowing back into the second compressor 120, thus protecting the second compressor 120.

[0038] Optionally, the inlet end of the first switching valve 510 and the inlet end of the second switching valve 520 are both connected to the exhaust port of the first compressor 110. The outlet end of the first switching valve 510 is connected to the suction port of the second compressor 120, and the exhaust port of the second compressor 120 is connected to the D port of the four-way valve 200 through the first one-way valve 130. The outlet end of the second switching valve 520 is connected to the outlet end of the first one-way valve 130 and the D port of the four-way valve 200.

[0039] In some embodiments, the heat pump system further includes a user terminal 700; a water-side heat exchanger 300 has a water flow channel formed therein, with its two ends connected to the inlet and outlet of the user terminal 700, respectively. The water flow channel and the user terminal 700 form a water circulation loop, where the water in the water flow channel exchanges heat with the refrigerant in the refrigerant flow channel. In heating mode, the water heats up to output hot water, while the refrigerant cools down. In cooling mode, the water cools down to output chilled water, while the refrigerant heats up.

[0040] In one embodiment, the heat pump system further includes a temperature detection component and a controller; the temperature detection component is used to detect the inlet water temperature of the water-side heat exchanger 300; the controller is electrically connected to the temperature detection component, and the controller can determine the defrosting mode that the heat pump system enters based on the inlet water temperature; wherein, the defrosting mode includes a single-stage defrosting mode and a two-stage defrosting mode.

[0041] After the heat pump system starts defrosting mode, the controller obtains the inlet water temperature from the temperature detection component.

[0042] When the inlet water temperature exceeds the water temperature threshold, the heat pump system enters single-stage defrosting mode. Specifically, the controller closes the first switching valve 510, opens the second switching valve 520, starts the first compressor 110, and stops the second compressor 120. The refrigerant is discharged through the first compressor 110 and enters the four-way valve 200, then enters the air-side heat exchanger 400 from port E of the four-way valve 200, thus defrosting the air-side heat exchanger 400. Finally, the refrigerant flows through the refrigerant channel of the water-side heat exchanger 300, enters the four-way valve 200 from port C, and is then drawn back into the first compressor 110 from the outlet port S.

[0043] When the inlet water temperature is not lower than the water temperature threshold, the heat pump system enters a two-stage defrosting mode. Specifically, the controller controls the first switching valve 510 to open, the second switching valve 520 to close, the first compressor 110 to start, and the second compressor 120 to start. The refrigerant discharged from the first compressor 110 is drawn into the second compressor 120 after passing through the first switching valve 510 and is compressed again by the second compressor 120; the refrigerant discharged from the second compressor 120 passes through the four-way valve 200 and is discharged from the E port of the four-way valve 200, entering the air-side heat exchanger 400 to achieve two-stage defrosting of the air-side heat exchanger 400; finally, the refrigerant passes through the refrigerant flow channel of the water-side heat exchanger 300, enters the four-way valve 200 from the C port, and is then drawn back into the first compressor 110 from the S port outlet.

[0044] Optionally, the temperature detection component includes a temperature sensor. The temperature sensor is installed at the inlet of the water channel to detect the temperature of the incoming water.

[0045] In some embodiments, the heat pump system further includes a first throttling component 900; the refrigerant flow path of the water-side heat exchanger 300 is connected to the air-side heat exchanger 400 through the first throttling component 900. Preferably, the first throttling component 900 includes a first throttling valve.

[0046] In one embodiment, the heat pump system further includes a first heat exchanger 610, a second throttling assembly 620, and a first gas supply pipe 630; the first heat exchanger 610 has a first flow channel and a second flow channel formed therein; one end of the first flow channel is connected to the other end of the refrigerant flow channel, and the other end of the first flow channel is connected to the air-side heat exchanger 400 through the first throttling assembly 900; one end of the second flow channel is connected to the other end of the refrigerant flow channel through the second throttling assembly 620, and the other end of the second flow channel is connected to the gas supply port of the first compressor 110 through the first gas supply pipe 630.

[0047] In this embodiment, a two-stage compression cycle with an economizer is constructed by introducing a first heat exchanger 610 (intermediate heat exchanger), a second throttling component 620, and a make-up gas branch pipe, significantly improving the system's performance and energy efficiency over a wide temperature range. The make-up gas enthalpy enhancement technology increases refrigerant flow, maintaining high heating capacity even below -25°C. The intermediate heat exchanger recovers refrigerant subcooling, reducing throttling losses and improving overall energy efficiency. Make-up gas lowers the compressor discharge temperature, preventing high-temperature protection shutdown.

[0048] Furthermore, the heat pump system also includes a third throttling component 640; the third throttling component 640 is located in the first gas supply pipe 630. The medium-pressure gas-liquid mixed refrigerant flowing from the second channel of the first heat exchanger 610 is depressurized by the third throttling component 640, becoming a pure medium-pressure gas, before entering the compressor through the first gas supply pipe 630. The third throttling component 640 (such as an electronic expansion valve) can adjust its opening in real time according to parameters such as system load and outdoor temperature, controlling the gas supply pressure and flow rate. By throttling the evaporator, the third throttling component 640 ensures that the refrigerant delivered by the first gas supply pipe 630 is in a pure gaseous state, protecting the compressor. Compared to systems without the third throttling component 640, reliability is significantly improved.

[0049] Optionally, the first heat exchanger 610 can be an economizer.

[0050] Optionally, the third throttling assembly 640 includes a throttling valve.

[0051] Furthermore, the heat pump system also includes a second gas supply pipe 650 and a second one-way valve 660; one end of the second gas supply pipe 650 is connected to the suction port of the second compressor 120, and the other end of the second gas supply pipe 650 is connected to the other end of the second flow channel; the second one-way valve 660 is disposed in the second gas supply pipe 650 and is connected in parallel with the third throttling component 640. In this embodiment, the introduction of the second one-way valve 660, which is connected in parallel with the third throttling component 640, into the heat pump system is a further optimization of the two-stage compression gas supply system, realizing flexible switching of the gas supply path and multi-mode collaborative control, significantly improving the system's adaptability, energy efficiency, and performance under extreme conditions. Injection through the original gas supply branch (including the third throttling component 640) enhances the overall circulation volume of the system. Direct injection into the second compressor 120 through the second gas supply branch (controlled by the second one-way valve 660) optimizes the intermediate pressure and reduces the compression ratio of the second compressor 120.

[0052] For example, the refrigerant discharged from the second flow channel of the first heat exchanger 610 is divided into two paths. One path enters the second gas supply pipe 650 and, after passing through the second one-way valve 660, merges with the refrigerant discharged from the first compressor 110 and is then drawn into the second compressor 120. The other path enters the first gas supply pipe 630 and, after passing through the third throttling assembly 640, is directly drawn into the gas supply port of the first compressor 110 to supply gas to the first compressor 110.

[0053] In some embodiments, the heat pump system further includes a gas-liquid separator; the S-end of the four-way valve 200 is connected to the suction port of the first compressor 110 through the gas-liquid separator to avoid liquid slugging.

[0054] In some embodiments, the heat pump system further includes a heating component; the heating component is disposed at the suction port of the first compressor 110 and is used to raise the refrigerant temperature at the suction port of the first compressor 110. This design can increase the suction temperature of the first compressor 110 and alleviate the frost formation phenomenon of the compressor.

[0055] like Figure 2 As shown, the heating component further includes a second heat exchanger 810; the second heat exchanger 810 has a third flow channel and a fourth flow channel; the S port of the four-way valve 200 is connected to the suction port of the first compressor 110 through the third flow channel, and the exhaust port of the first compressor 110 is connected to the suction port of the second compressor 120 through the fourth flow channel.

[0056] With this design, the refrigerant discharged from the S port of the four-way valve 200 first enters the third flow channel, while the refrigerant discharged from the exhaust port of the first compressor 110 enters the fourth flow channel. The refrigerant undergoes heat exchange in the second heat exchanger 810, which can increase the temperature of the refrigerant drawn into the first compressor 110 and decrease the temperature of the refrigerant drawn into the second compressor 120. This achieves the goal of lowering the exhaust temperature of the second compressor 120 while increasing the intake temperature of the first compressor 110, thereby increasing the heating capacity and alleviating the frost phenomenon of the compressor.

[0057] like Figure 3 As shown, optionally, the heating component includes a heating element 820. A suction pipe is installed at the suction port of the first compressor 110, and the heating element 820 is located outside the suction pipe and in contact with it, for heating the refrigerant inside the suction pipe. This design can increase the suction temperature of the first compressor 110, increase its heating capacity, and alleviate the frost formation on the compressor.

[0058] Optionally, the heating element 820 includes an electric heating resistance wire. The electric heating resistance wire is wound around the outside of the intake pipe, and heating of the intake pipe is achieved by energizing the electric heating resistance wire.

[0059] Optionally, the heating element 820 is a heating tube; the water channel and the user terminal 700 form a water circulation loop, and both ends of the heating tube are connected to the water circulation loop. With this design, by setting a heating tube in contact with the intake pipe and connecting both ends of the heating tube to the water circulation loop, hot water from the water circulation loop can be led to the heating tube, and the temperature of the hot water can be used to heat the refrigerant in the intake pipe.

[0060] Preferably, the inlet end of the heating element is connected to the outlet end of the water channel, and the outlet end of the heating element is connected to the inlet end of the water channel.

[0061] Preferably, the heating element is a spiral tube with a circular cross-section. The spiral tube is sleeved on the outside of the suction pipe, and the inner wall of the spiral tube is in contact with the outer surface of the suction pipe. By increasing the contact area with the suction pipe, the heat exchange efficiency is improved, allowing the temperature of the refrigerant entering the first compressor 110 to rise rapidly.

[0062] like Figure 4As shown, in some embodiments of this utility model, the heat pump system includes a water-side heat exchanger 300, a first water pump module 12, a first valve body 13, a first reserved interface 14, and a second reserved interface 15; the water-side heat exchanger 300 is used to output hot water; the inlet end of the first water pump module 12 is connected to the outlet end of the water-side heat exchanger 300, and the outlet end of the first water pump module 12 is connected to the inlet end of the water-side heat exchanger 300, forming a water circulation loop; the first valve body 13 is disposed in the water circulation loop; the first valve body 13 has a conducting state and a shut-off state; the first reserved interface 14 is located at the inlet end of the first valve body 13; the second reserved interface 15 is located at the outlet end of the first valve body 13; the first reserved interface 14 and the second reserved interface 15 are used for detachable connection with the second water pump module 16.

[0063] In this embodiment, by reserving a first reserved interface 14 at the inlet end of the first valve body 13 and a second reserved interface 15 at the outlet end of the first valve body 13, a second water pump module 16 can be connected between the first reserved interface 14 and the second reserved interface 15 if the actual temperature of the user terminal 700 still cannot reach the user's required temperature when the first water pump module 12 is running at its rated frequency. Simultaneously, the first valve body 13 is switched from a conducting state to a closed state, and the second water pump module 16 is started. At this time, the first water pump module 12 and the second water pump module 16 are connected in series and start simultaneously, which can increase the water output and pressure of the heat pump system, allowing the actual temperature of the user terminal 700 to reach the user's required temperature. This design can improve the applicability of the heat pump system, enhance the user experience, and solve the problem in the prior art where heat pump systems equipped with fixed-frequency water pumps cannot dynamically adjust heating efficiency according to actual needs, resulting in a poor user experience.

[0064] In other words, in the heat pump system of this embodiment, a first reserved interface 14 and a second reserved interface 15 are reserved at both ends of the first valve body 13, allowing the user to decide whether to connect the second water pump module 16 according to their actual needs. When the first water pump module 12 can meet the user's needs, the first reserved interface 14 and the second reserved interface 15 can be closed, that is, the second water pump module 16 is not connected. When the first water pump module 12 is running at its rated frequency, if the actual temperature of the user terminal 700 still cannot meet the user's needs, the user can connect their separately purchased second water pump module 16 to the first reserved interface 14 and the second reserved interface 15.

[0065] When the second water pump module 16 is connected to the first reserved interface 14 and the second reserved interface 15, the first valve body 13 switches from the conducting state to the closed state. At this time, the first water pump module 12 and the second water pump module 16 are connected in series, and the water output of the heat pump system is the sum of the water outputs of the two water pump modules. When the second water pump module 16 is not connected to the first reserved interface 14 and the second reserved interface 15, the first valve body 13 switches from the closed state back to the conducting state. The hot water discharged from the first water pump module 12 flows to the user terminal 700 after passing through the first valve body 13, and the hot water no longer passes through the second water pump module 16. At this time, the water output of the heat pump system is the water output of the first water pump module 12.

[0066] Furthermore, the first valve body 13 can be a solenoid valve, which facilitates automated control.

[0067] like Figure 4 As shown, in some embodiments, the heat pump system further includes a user terminal 700; the inlet of the user terminal 700 is connected to the outlet of the first valve body 13, and the outlet of the user terminal 700 is connected to the inlet of the water-side heat exchanger 300. Hot water flowing out of the water-side heat exchanger 300 enters the user terminal 700, where heat exchange occurs, thereby providing indoor heating. The cooled hot water discharged from the user terminal 700 returns to the water-side heat exchanger 300 to continue exchanging heat with the refrigerant.

[0068] Furthermore, the user terminal 700 includes an indoor heat exchanger.

[0069] like Figure 5 As shown, in some embodiments, the heat pump system further includes a second water pump module 16; the inlet of the second water pump module 16 is connected to the first reserved interface 14; the outlet of the second water pump module 16 is connected to the second reserved interface 15. By adding the second water pump module 16, the applicable scenarios of the heat pump system can be improved and the application range can be expanded.

[0070] Optionally, the second water pump module 16 includes a second water pump body and a second water pump drive unit; the input terminal of the second water pump drive unit is electrically connected to the control module, and the output terminal of the second water pump drive unit is connected to the second water pump body. The second water pump drive unit is used to control the second water pump body to stop or start according to the control commands issued by the control module.

[0071] Optionally, the second water pump drive unit and the second water pump body can be designed as an integrated unit or as separate units. For example, the second water pump drive unit and control module are housed in the electrical control box, while the water inlet of the second water pump body is connected to the first reserved interface 14; the water outlet of the second water pump body is connected to the second reserved interface 15. This design represents a separate design of the second water pump drive unit and the second water pump body. Alternatively, the second water pump drive unit can be directly installed on the second water pump body; this design represents an integrated design.

[0072] Optionally, the second water pump drive unit includes a variable frequency drive board or a fixed frequency drive board.

[0073] like Figure 6 and Figure 7 As shown, in some embodiments, the heat pump system further includes a control module and a second water pump module 17; the first output terminal of the control module is electrically connected to the first water pump module 12 and is used to control the start and stop of the first water pump module 12; the second output terminal of the control module is electrically connected to the control terminal of the second water pump module 17 and is used to control the second water pump module 17 to switch between a closed state and an open state; the second water pump module 17 is also used to be electrically connected to a second water pump module 16; in the closed state, the second water pump module 16 is powered on and started; in the open state, the second water pump module 16 is powered off and stopped.

[0074] In this embodiment, by setting a second water pump module 17 that is electrically connected to the control module, and the second water pump module 17 is also used to be electrically connected to the second water pump module 16, the power-on and power-off of the second water pump module 16 can be automatically controlled, so as to realize the automatic control of the power-on and power-off of the second water pump module 16 according to the actual operation of the system and the actual needs.

[0075] In addition, the first output terminal of the control module is electrically connected to the first water pump module 12, which can realize the start and stop control of the first water pump module 12 and realize the automatic control of the first water pump module 12.

[0076] Optionally, the control module can be a microcontroller unit (MCU).

[0077] like Figure 7 As shown, optionally, the second water pump module 17 includes a relay. The control terminal of the relay is connected to the second output terminal of the control module, and the relay is located between the power supply 18 and the second water pump module 16. When the relay is closed, the relay, the power supply 18, and the second water pump module 16 form a current loop, and the second water pump module 16 is powered on and started. When the relay is open, the current loop is broken, and the second water pump module 16 is powered off.

[0078] Optionally, both the control module and the second water pump module 17 can be installed inside the electrical control box. The second water pump module 17 serves as a reserved switch for the second water pump module 16. When the second water pump module 16 is connected to the first reserved interface 14 and the second reserved interface 15, in order to also connect the second water pump module 16 to the control module of the heat pump system, the communication interface of the second water pump module 16 can be connected to the second water pump module 17. This allows for automated control of the second water pump module 16 using the control module.

[0079] like Figure 6 As shown, in some embodiments, the first water pump module 12 includes a first water pump drive unit and a first water pump body; the first output terminal of the control module is electrically connected to the input terminal of the first water pump drive unit; the first water pump body and the first water pump drive unit are arranged separately; the output terminal of the first water pump drive unit is electrically connected to the first water pump body for driving the start and stop of the first water pump body.

[0080] Existing heat pump systems typically use modular and integrated pumps, meaning the pump drive board is integrated with the pump body. This requires purchasing modularly designed pumps, which increases not only the material costs of the heat pump system but also its control costs.

[0081] In this embodiment, the first water pump body and the first water pump drive unit are arranged separately, which can not only reduce material costs and maintenance costs, but also reduce control costs.

[0082] Optionally, the control module and the first water pump drive unit can both be housed in the electrical control box.

[0083] Optionally, the first water pump drive unit includes a variable frequency drive board. By setting the variable frequency drive board, the water pressure and flow rate can be adjusted by changing the operating frequency of the first water pump body. This allows the heating capacity of the heat pump system to be adjusted according to the user's actual needs, thus alleviating energy waste.

[0084] In some embodiments, the heat pump system further includes an electrical control box; the control module, the second water pump module 17 and the first water pump drive unit are all installed in the electrical control box.

[0085] like Figure 6 As shown, in some embodiments, the heat pump system further includes an information acquisition module; the information acquisition module is electrically connected to the input terminal of the control module; the information acquisition module is used to acquire the actual operating parameters of the heat pump system, the actual operating parameters including at least one of the actual water flow rate of the first water pump module 12, the water outlet temperature of the water-side heat exchanger 300, and the water inlet temperature of the water-side heat exchanger 300.

[0086] In this embodiment, by collecting actual operating parameters, the actual operating status of the system can be determined on the one hand, and on the other hand, a basis can be provided for the control module to adjust the first water pump module 12 and / or the second water pump module 16, thus avoiding blind adjustments.

[0087] Optionally, the information acquisition module includes various sensors. For example, the information acquisition module includes at least one of a flow sensor, an outlet water temperature sensor, and an inlet water temperature sensor. The flow sensor is located at the outlet end of the first water pump body to detect the outlet water flow rate of the first water pump body. The outlet water temperature sensor is located at the outlet end of the water-side heat exchanger 300 to detect the outlet water temperature of the water-side heat exchanger 300. The inlet water temperature sensor is located at the inlet end of the water-side heat exchanger 300 to detect the inlet water temperature of the water-side heat exchanger 300.

[0088] A second aspect of this utility model provides a heat pump unit. This heat pump unit includes the heat pump system of any of the above embodiments, and therefore possesses at least the aforementioned advantages, which will not be elaborated further here.

[0089] In some embodiments, the heat pump unit further includes an outer casing; an installation cavity is formed within the outer casing. The air-side heat exchanger 400, the first compressor 110, and the second compressor 120 are all installed in the installation cavity.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat pump system, characterized in that, include: First compressor (110) and second compressor (120); A four-way valve (200) is connected at its D port to the exhaust port of the second compressor (120); and at its S port to the intake port of the first compressor (110). The water-side heat exchanger (300) has a refrigerant flow channel inside; the C port of the four-way valve (200) is connected to one end of the refrigerant flow channel; The air-side heat exchanger (400) is connected at one end to the other end of the refrigerant flow channel and at the other end to the E port of the four-way valve (200). The first valve body assembly (500) has a first conducting state and a second conducting state; in the first conducting state, the refrigerant discharged from the exhaust port of the first compressor (110) enters the suction port of the second compressor (120); In the second conducting state, the refrigerant discharged from the exhaust port of the first compressor (110) enters the D port of the four-way valve (200).

2. The heat pump system according to claim 1, characterized in that, The first valve body assembly (500) includes: A first switching valve (510) is connected at one end to the exhaust port of the first compressor (110) and at the other end to the intake port of the second compressor (120). The second switching valve (520) has one end connected to one end of the first switching valve (510), and the other end of the second switching valve (520) is connected to the exhaust port of the second compressor (120) and the D port of the four-way valve (200).

3. The heat pump system according to claim 1, characterized in that, The first valve body assembly (500) includes a three-way reversing valve; the inlet of the three-way reversing valve is connected to the outlet of the first compressor (110), the first outlet of the three-way reversing valve is connected to the suction port of the second compressor (120), and the second outlet of the three-way reversing valve is connected to the outlet of the second compressor (120) and the D port of the four-way valve (200).

4. The heat pump system according to claim 1, characterized in that, Also includes: In the user terminal (700), a water flow channel is formed in the water-side heat exchanger (300), and the two ends of the water flow channel are respectively connected to the inlet and outlet of the user terminal (700) to form a water circulation loop.

5. The heat pump system according to claim 1, characterized in that, Also includes: A temperature detection component is used to detect the inlet water temperature of the water-side heat exchanger (300); The controller is electrically connected to the temperature detection component.

6. The heat pump system according to claim 1, characterized in that, Also includes: The first check valve (130) is connected to the D port of the four-way valve (200) through the exhaust port of the second compressor (120).

7. The heat pump system according to any one of claims 1 to 6, characterized in that, Also includes: A heating component is provided at the suction port of the first compressor (110) to raise the refrigerant temperature at the suction port of the first compressor (110).

8. The heat pump system according to claim 7, characterized in that, The heating component includes: The heating element (820) is provided with a suction pipe installed at the suction port of the first compressor (110); the heating element (820) is disposed on the outside of the suction pipe and in contact with the suction pipe, and is used to heat the refrigerant in the suction pipe.

9. The heat pump system according to claim 8, characterized in that, The heating element (820) includes an electric heating resistance wire or a heating tube.

10. A heat pump unit, characterized in that, Includes the heat pump system as described in any one of claims 1 to 9.

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