Heat pump system and heat pump unit

Abstract

The invention relates to the technical field of heat pumps, and discloses a heat pump system and a heat pump unit. The heat pump system comprises a first compressor, a second compressor, a water side heat exchanger, a first throttling assembly, an air side heat exchanger and a first switch valve. The water side heat exchanger is provided with a refrigerant flow channel; an exhaust port of the first compressor is communicated with an air suction port of the second compressor; an exhaust port of the second compressor communicates with an air suction port of the first compressor through a refrigerant flow channel, the first throttling assembly and the air side heat exchanger in sequence, so that a refrigerant circulation loop is formed; the two ends of the first switch valve are communicated with an air suction port and an air exhaust port of the first compressor respectively, or the two ends of the first switch valve are communicated with an air suction port and an air exhaust port of the second compressor respectively. According to the double-stage compression heat pump system, by arranging the first switch valve, the heat pump system can be switched between double-stage compression and single-stage compression, and the problem that in the prior art, a double-stage compression heat pump system is poor in energy utilization rate under the condition that the environment temperature is high is solved.

Description

Technical Field

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

[0002] Heat pump systems include air conditioning heat pump systems and air source heat pump systems. The water-side heat exchanger in an air source heat pump system can output hot water to meet users' heating and hot water needs. The outdoor heat exchanger in an air conditioning heat pump system, driven by a fan, provides heating or cooling to the interior of the room.

[0003] To adapt to extreme environments, increase the heating capacity of heat pump systems, and ensure that they can still output high-temperature hot water or meet user heating needs in cold environments, such as -30 degrees Celsius, two compressors in series are generally used for two-stage compression. However, in such two-stage compression heat pump systems, when the ambient temperature is higher, such as above -10 degrees Celsius, the two compressors in series still operate synchronously, resulting in energy waste.

[0004] Therefore, when the ambient temperature is high, how to improve the energy utilization rate of the system and alleviate energy waste is an issue that the industry urgently needs to solve. Summary of the Invention

[0005] The present invention provides a heat pump system and a heat pump unit, which are used to solve the problem of poor energy utilization efficiency in the conventional two-stage compression heat pump system under high ambient temperature.

[0006] The present invention provides a heat pump system, comprising: First compressor; a second compressor, wherein the exhaust port of the first compressor is connected to the intake port of the second compressor; A water-side heat exchanger having a refrigerant flow channel; a first throttling assembly and an air-side heat exchanger, wherein the exhaust port of the second compressor is connected to the intake port of the first compressor in sequence through the refrigerant flow channel, the first throttling assembly and the air-side heat exchanger to form a refrigerant circulation loop; A first switch valve, wherein both ends of the first switch valve are respectively connected to the intake port and the exhaust port of the first compressor, or the both ends of the first switch valve are respectively connected to the intake port and the exhaust port of the second compressor.

[0007] The heat pump system provided by the present invention further includes: A power source, the power source being connected to the refrigerant circulation loop to provide circulating power for the refrigerant; The second switch valve has two ends connected to the inlet and outlet of the power source respectively.

[0008] According to the heat pump system provided by the present invention, the inlet of the power source is communicated with the first throttling assembly, and the outlet of the power source is communicated with the air-side heat exchanger.

[0009] The heat pump system provided by the present invention further includes: The first heat exchanger has a first flow channel and a second flow channel; one end of the first flow channel is connected to the refrigerant flow channel, and the other end of the first flow channel is connected to the first throttling component; A second throttling component and a first air supply pipe, one end of the second flow channel is connected to the refrigerant flow channel through the second throttling component, and the other end of the second flow channel is connected to the air supply port of the first compressor through the first air supply pipe.

[0010] The heat pump system provided by the present invention further includes: The third throttling component is arranged on the first air supply pipe.

[0011] The heat pump system provided by the present invention further includes: a second air supply pipe, one end of the second air supply pipe being connected to the air intake port of the second compressor, and the other end of the second air supply pipe being connected to the other end of the second flow channel; The third switch valve is arranged on the second air supply pipe and is connected in parallel with the third throttling component.

[0012] The heat pump system provided by the present invention further includes: A four-way valve, the D port of the four-way valve is connected to the exhaust port of the second compressor, the C port of the four-way valve is connected to the refrigerant flow channel of the water-side heat exchanger, the E port of the four-way valve is connected to the air-side heat exchanger, and the S port of the four-way valve is connected to the intake port of the first compressor.

[0013] The heat pump system provided by the present invention further includes: The temperature increasing component is arranged at the air intake of the first compressor and is used to increase the refrigerant temperature at the air intake of the first compressor.

[0014] According to the heat pump system provided by the present invention, the temperature raising component comprises: The second heat exchanger has a third flow channel and a fourth flow channel; the S port of the four-way valve is connected to the intake port of the first compressor through the third flow channel, and the exhaust port of the first compressor is connected to the intake port of the second compressor through the fourth flow channel.

[0015] The present invention also provides a heat pump unit, comprising any of the above-mentioned heat pump systems.

[0016] The heat pump system provided by the present invention can switch between two-stage compression and single-stage compression by setting a first switch valve. Specifically, taking the first switch valve and the first compressor in parallel as an example, when the first switch valve is closed, the first compressor and the second compressor are connected in series to achieve two-stage compression of the refrigerant. When the first switch valve is opened, the first compressor stops running, and the second compressor achieves single-stage compression of the refrigerant. When the ambient temperature is high, the first switch valve can be opened to enable the heat pump system to perform single-stage compression, thereby alleviating energy waste and solving the problem of poor energy utilization in the two-stage compression heat pump system in the prior art under high ambient temperature conditions. When the ambient temperature is low, the first switch valve can be closed to enable the heat pump system to perform two-stage compression, thereby increasing the heating capacity of the system and ensuring that high-temperature hot water that meets user needs can be output. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is one of the structural diagrams of the heat pump system provided by the present invention, wherein the arrows represent the direction of water flow.

[0019] Figure 2 This is the second structural diagram of the heat pump system provided by the present invention, wherein the arrow represents the direction of water flow.

[0020] Figure 3 This is the third structural diagram of the heat pump system provided by the present invention.

[0021] Figure 4 This is the fourth structural diagram of the heat pump system provided by the present invention.

[0022] Figure 5 This is the fifth structural diagram of the heat pump system provided by the present invention.

[0023] Figure 6 It is an equivalent circuit diagram of the first water pump module and the second water pump module of the heat pump system provided by the present invention.

[0024] Figure 7 This is one of the flow charts of the control method of the heat pump system provided by the present invention.

[0025] Figure 8 This is the second flow chart of the control method of the heat pump system provided by the present invention.

[0026] Figure 9 It is a structural schematic diagram of the electronic device provided by the present invention.

[0027] Reference numerals: 110, first compressor; 120, second compressor; 200, water side heat exchanger; 300, first throttle assembly; 400, air side heat exchanger; 500, first switch valve; 610, power source; 620, second switch valve; 710, first heat exchanger; 720, second throttling assembly; 730, first air supply pipe; 740, third throttling assembly; 750, second air supply pipe; 760, third switch valve; 800, four-way valve; 910, second heat exchanger; 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; 19. User terminal; 810 , processor; 820 , communication interface; 830 , memory; 840 , communication bus. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention in specific circumstances.

[0030] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0031] Existing air conditioning heat pump systems include a compressor, an indoor heat exchanger, a throttling device, and an outdoor heat exchanger; a refrigerant circulation loop is formed between the compressor, the outdoor heat exchanger, the throttling device, and the outdoor heat exchanger. Under cooling conditions, the compressor discharges high-temperature, high-pressure gaseous refrigerant, which is condensed in the outdoor heat exchanger and converted into liquid refrigerant. The throttling temperature of the liquid refrigerant further drops after passing through the throttling device, and the low-temperature liquid refrigerant flowing out of the throttling device enters the indoor heat exchanger, meeting the need for indoor cooling. Under heating conditions, the high-temperature, high-pressure gaseous refrigerant discharged by the compressor enters the indoor heat exchanger, meeting the need for indoor heating; the medium-temperature liquid refrigerant discharged from the indoor heat exchanger passes through the throttling device and the outdoor heat exchanger in turn and returns to the compressor.

[0032] The principle of existing air source heat pump systems is the same as that of air conditioning heat pump systems. The air source heat pump system inputs hot water during heating and outputs cold water during cooling.

[0033] The following combination Figure 1 and Figure 2 The heat pump system of the present invention is described in detail. It should be noted that the heat pump system of the present invention can be an air conditioning heat pump system or an air source heat pump system.

[0034] like Figure 1 and Figure 2 As shown, a specific embodiment of the first aspect of the present invention provides a heat pump system, which includes a first compressor 110 , a second compressor 120 , a water-side heat exchanger 200 , a first throttling assembly 300 , an air-side heat exchanger 400 , and a first switch valve 500 .

[0035] Among them, the water side heat exchanger 200 has a refrigerant flow channel; the exhaust port of the first compressor 110 is connected to the intake port of the second compressor 120; the exhaust port of the second compressor 120 is connected to the intake port of the first compressor 110 through the refrigerant flow channel, the first throttling assembly 300 and the air side heat exchanger 400 in sequence to form a refrigerant circulation loop; the two ends of the first switch valve 500 are respectively connected to the intake port and exhaust port of the first compressor 110, or the two ends of the first switch valve 500 are respectively connected to the intake port and exhaust port of the second compressor 120.

[0036] In this embodiment, by providing a first switch valve 500, the heat pump system can be switched between two-stage compression and single-stage compression. Specifically, taking the first switch valve 500 and the first compressor 110 in parallel as an example, when the first switch valve 500 is closed, the first compressor 110 and the second compressor 120 are connected in series, achieving two-stage compression of the refrigerant. When the first switch valve 500 is opened, the first compressor 110 stops running, and the second compressor 120 achieves single-stage compression of the refrigerant. When the ambient temperature is high, the first switch valve 500 can be opened to enable the heat pump system to perform single-stage compression, thereby alleviating energy waste and solving the problem of poor energy utilization efficiency in high ambient temperature conditions in two-stage compression heat pump systems in the prior art. When the ambient temperature is low, the first switch valve 500 can be closed to enable the heat pump system to perform two-stage compression, thereby increasing the heating capacity of the system and ensuring that high-temperature hot water that meets user needs can be output.

[0037] It should be noted that the water-side heat exchanger 200 can support multiple scenarios such as cooling, heating, and hot water supply.

[0038] Optionally, the water-side heat exchanger 200 further includes a water channel arranged in parallel with the refrigerant channel to achieve heat exchange. When high-temperature, high-pressure gaseous refrigerant flows through the refrigerant channel, the water in the water channel can be heated to output hot water.

[0039] It is understandable that the heat pump system of this embodiment has two operating modes: one is a two-stage compression operating mode, and the other is an energy-saving operating mode, that is, a single-stage compression operating mode.

[0040] The following describes the two operating modes of this embodiment by taking the heating condition and the first switch valve 500 being connected in parallel with the first compressor 110 as an example.

[0041] In heating mode, when the ambient temperature is below the first temperature threshold, for example, below -30°C, a two-stage compression operation mode is implemented. Specifically, the first on-off valve 500 is closed, the first compressor 110 and the second compressor 120 are connected in series, and the high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 120 passes through the refrigerant flow channel of the water-side heat exchanger 200, the first throttling assembly 300, and the air-side heat exchanger 400 in sequence and returns to the intake port of the first compressor 110, thus completing the refrigerant circulation. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the water in the water flow channel in the water-side heat exchanger 200, achieving the purpose of outputting high-temperature hot water, for example, hot water with a temperature above 45°C.

[0042] In heating mode, and when the ambient temperature is not lower than the second temperature threshold, for example, when the ambient temperature is not lower than -25°C, the energy-saving operation mode is implemented. Specifically, the first on-off valve 500 is opened, the first compressor 110 is not started, and the second compressor 120 is started. The high-temperature and high-pressure gaseous refrigerant discharged from the second compressor 120 passes through the refrigerant flow channel of the water-side heat exchanger 200, the first throttling assembly 300, the air-side heat exchanger 400, and the first on-off valve 500 in sequence, returning to the intake port of the second compressor 120, thus completing the refrigerant circulation. The high-temperature and high-pressure gaseous refrigerant exchanges heat with the water in the water flow channel in the water-side heat exchanger 200, achieving the purpose of outputting high-temperature hot water, for example, outputting hot water with a water temperature of less than 45°C.

[0043] It should be noted that the first temperature threshold and the second temperature threshold may be equal or different. In the case where the first temperature threshold and the second temperature threshold are not equal, the first temperature threshold may be smaller than the second temperature threshold.

[0044] Optionally, the first switch valve 500 may be a solenoid valve, a throttle valve or a proportional valve. The function of the first switch valve 500 is to control the conduction and cutoff of the refrigerant flow path.

[0045] Optionally, the first throttling assembly 300 includes a first throttling valve or an expansion valve.

[0046] Optionally, the operating frequency of the first compressor 110 may be greater than the operating frequency of the second compressor 120 ; the operating frequency of the first compressor 110 may also be less than the operating frequency of the second compressor 120 .

[0047] Optionally, the rated frequency of the first compressor 110 may be greater than the rated frequency of the second compressor 120 ; the rated frequency of the first compressor 110 may also be less than the rated frequency of the second compressor 120 .

[0048] Furthermore, the heat pump system also includes a cooling fan; the cooling fan is arranged on one side of the air-side heat exchanger 400, and is used to blow air to the air-side heat exchanger 400 to achieve heat dissipation of the air-side heat exchanger 400 and improve the heat exchange efficiency of the air-side heat exchanger 400.

[0049] Furthermore, the heat pump system also includes a four-way valve 800; the D port of the four-way valve 800 is connected to the exhaust port of the second compressor 120, the C port of the four-way valve 800 is connected to the refrigerant flow channel of the water side heat exchanger 200, the E port of the four-way valve 800 is connected to the air side heat exchanger 400, and the S port of the four-way valve 800 is connected to the intake port of the first compressor 110.

[0050] In this embodiment, the heat pump system can be switched between cooling and heating modes by providing a four-way valve 800. Specifically, in the heating mode, the high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 120 enters through port D of the four-way valve 800, is discharged through port C, and flows into the refrigerant flow channel. The refrigerant discharged from the refrigerant flow channel passes through the first throttling assembly 300 and the air-side heat exchanger 400, enters through port E of the four-way valve 800, is discharged through port S, and is finally sucked into the first compressor 110 or the second compressor 120. Under refrigeration conditions, the high-temperature and high-pressure gaseous refrigerant discharged from the second compressor 120 enters from the D port of the four-way valve 800, is discharged from the E port, and flows into the air-side heat exchanger 400; the refrigerant flowing out of the air-side heat exchanger 400 passes through the first throttling component 300 and the refrigerant flow channel of the water-side heat exchanger 200 in turn, enters from the C port of the four-way valve 800, and is then discharged from the S port and sucked into the first compressor 110 or the second compressor 120.

[0051] Furthermore, the heat pump system includes an oil-gas separator installed between the exhaust port of the second compressor 120 and port D of the four-way valve 800. The oil-gas separator is also connected to the intake port of the first compressor 110 via an oil return capillary tube. The oil-gas separator heats the hydraulic oil in the first and second compressors 110, 120, and separates the oil and gas, thereby extending the service life of the compressors.

[0052] In some embodiments, the heat pump system further includes a power source 610 and a second switch valve 620 ; the power source 610 is connected to the refrigerant circulation loop to provide circulating power for the refrigerant; the two ends of the second switch valve 620 are respectively connected to the inlet and outlet of the power source 610 .

[0053] In this embodiment, when the heat pump system operates in single-stage compression mode, the second on-off valve 620 is closed, and the power source 610 is activated. Power source 610 then replaces the first compressor 110 in providing refrigerant circulation power, compensating for the insufficient pressure differential of a single-stage compressor and ensuring smooth refrigerant circulation. Power source 610 also assists in rapid refrigerant circulation, avoiding pressure fluctuations during mode switching. When the heat pump system operates in two-stage compression mode, the second on-off valve 620 is opened, and the power source 610 is closed. In this case, power source 610 is no longer required to provide refrigerant power. The design of power source 610 also serves as a backup drive unit, maintaining basic circulation capacity in the event of compressor failure. The rapid opening and closing of the second on-off valve 620, combined with the startup and shutdown of the power source 610, allows for smooth transitions between single-stage and two-stage modes, avoiding the risk of liquid hammer caused by sudden changes in refrigerant flow. Power source 610 can also serve as an emergency drive unit, assisting in maintaining refrigerant flow during periods of high compressor load (such as during defrosting).

[0054] Optionally, the power source 610 may be a fluorine pump.

[0055] Optionally, the second switching valve 620 includes a solenoid valve, a proportional valve or a throttle valve.

[0056] Furthermore, the inlet of the power source 610 is connected to the first throttle assembly 300, and the outlet of the power source 610 is connected to the air-side heat exchanger 400. Specifically, the inlet of the fluorine pump is connected to the first throttle valve, and the outlet of the fluorine pump is connected to the air-side heat exchanger 400. In the two-stage operation mode, the first on-off valve 500 is closed, the second on-off valve 620 is open, and the fluorine pump is not activated. In the single-stage operation mode, the first on-off valve 500 is open, the second on-off valve 620 is closed, and the fluorine pump is activated.

[0057] In this embodiment, by arranging the power source 610 and the second switch valve 620 between the first throttling assembly 300 and the air side heat exchanger 400, the suction superheat of the second compressor 120 can be ensured, and the high-pressure refrigerant can be prevented from directly impacting the compressor.

[0058] In some embodiments, the heat pump system also includes a first heat exchanger 710, a second throttling assembly 720 and a first air supply pipe 730; the first heat exchanger 710 has a first flow channel and a second flow channel; one end of the first flow channel is connected to the refrigerant flow channel, and the other end of the first flow channel is connected to the first throttling assembly 300; one end of the second flow channel is connected to the refrigerant flow channel through the second throttling assembly 720, and the other end of the second flow channel is connected to the air supply port of the first compressor 110 through the first air supply pipe 730.

[0059] In this embodiment, a two-stage compression cycle with an economizer is constructed by introducing a first heat exchanger 710 (intermediate heat exchanger), a second throttling assembly 720, and an air supply branch pipe. This significantly improves system performance and energy efficiency over a wide temperature range. Air supply enthalpy increase technology increases refrigerant flow, maintaining high heating capacity even at temperatures below -25°C. The intermediate heat exchanger recovers refrigerant subcooling, reducing throttling losses and improving overall energy efficiency. Air supply reduces compressor exhaust temperature, preventing high-temperature shutdown.

[0060] Furthermore, the heat pump system also includes a third throttling component 740; the third throttling component 740 is disposed in the first air supply pipe 730. The medium-pressure gas-liquid mixed refrigerant flowing out of the second flow channel of the first heat exchanger 710 is reduced in pressure by the third throttling component 740 to become pure medium-pressure gas, which then enters the compressor through the first air supply pipe 730. The third throttling component 740 (such as an electronic expansion valve) can adjust its opening in real time based on parameters such as system load and outdoor temperature to control the air supply pressure and flow. The third throttling component 740 can ensure that the refrigerant transported by the first air supply pipe 730 is pure gas by throttling evaporation, thereby protecting the compressor. Compared with a system without the third throttling component 740, reliability is significantly improved.

[0061] Optionally, the first heat exchanger 710 may be an economizer.

[0062] Optionally, the third throttle assembly 740 includes a throttle valve.

[0063] Furthermore, the heat pump system also includes a second air supply pipe 750 and a third on-off valve 760. One end of the second air supply pipe 750 is connected to the intake port of the second compressor 120, and the other end of the second air supply pipe 750 is connected to the other end of the second flow channel. The third on-off valve 760 is disposed in the second air supply pipe 750 and connected in parallel with the third throttle assembly 740. In this embodiment, the introduction of the third on-off valve 760 in the heat pump system, with the second air supply pipe 750 and the third throttle assembly 740 connected in parallel, further optimizes the two-stage compression air supply system. This enables flexible switching of air supply paths and multi-mode coordinated control, significantly improving the system's adaptability, energy efficiency, and performance under extreme operating conditions. Injection through the original air supply branch (including the third throttle assembly 740) increases the overall system circulation volume. Direct injection into the second compressor 120 through the second air supply branch (controlled by the third on-off valve 760) optimizes the intermediate pressure and reduces the compression ratio of the second compressor 120.

[0064] Optionally, the third switch valve 760 is a solenoid valve, a proportional valve or a throttle valve.

[0065] Specifically, the refrigerant discharged from the second flow channel of the first heat exchanger 710 is divided into two paths. One path enters the second air supply pipe 750, passes through the third on-off valve 760, and then merges with the refrigerant discharged from the first compressor 110, and is then sucked into the second compressor 120. The other path enters the first air supply pipe 730, passes through the third throttle assembly 740, and is directly sucked into the air supply port of the first compressor 110 for supplying air to the first compressor 110.

[0066] In some embodiments, the heat pump system further includes a gas-liquid separator; the S end of the four-way valve 800 is connected to the air intake of the first compressor 110 through the gas-liquid separator to avoid the problem of liquid hammer.

[0067] In some embodiments, the heat pump system further includes a heating component disposed at the intake port of the first compressor 110 for increasing the refrigerant temperature at the intake port of the first compressor 110. This design can increase the intake temperature of the first compressor 110 and alleviate frost formation on the compressor.

[0068] like Figure 2 As shown, further, the heating component includes a second heat exchanger 910; the second heat exchanger 910 has a third flow channel and a fourth flow channel; the S port of the four-way valve 800 is connected to the intake port of the first compressor 110 through the third flow channel, and the exhaust port of the first compressor 110 is connected to the intake port of the second compressor 120 through the fourth flow channel.

[0069] With this design, the refrigerant discharged from the S port of the four-way valve 800 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 exchanges heat in the second heat exchanger 910, which can increase the temperature of the refrigerant sucked into the first compressor 110 and reduce the temperature of the refrigerant sucked into the second compressor 120. This can reduce the exhaust temperature of the second compressor 120 while increasing the suction temperature of the first compressor 110, thereby increasing the heating capacity and alleviating the frosting of the compressor.

[0070] Optionally, the heating component includes a heating element, the intake port of the first compressor 110 is equipped with an intake pipe, the heating element is arranged on the outside of the intake pipe and in contact with the intake pipe, and is used to heat the refrigerant in the intake pipe.

[0071] Optionally, the heating element includes an electric heating resistance wire, which is wound around the outside of the intake pipe, and the intake pipe is heated by energizing the electric heating resistance wire.

[0072] Optionally, the heating element is a heating pipe; the water flow channel and the water-consuming equipment form a water circulation loop, with both ends of the heating pipe connected to the water circulation loop. With this design, by providing a heating pipe in contact with the intake pipe and connecting both ends of the heating pipe to the water circulation loop, hot water from the water circulation loop can be directed to the heating pipe, and the temperature of the hot water can be used to heat the refrigerant in the intake pipe.

[0073] Preferably, the water inlet end of the heating pipe is connected to the water outlet of the water flow channel, and the water outlet end of the heating pipe is connected to the water inlet end of the water flow channel.

[0074] Preferably, the heating tube is a spiral tube with a circular cross-section. The spiral tube is sleeved on the outside of the intake pipe, with the inner sidewall of the spiral tube contacting the outer side of the intake pipe. By increasing the contact area with the intake pipe, the heat exchange efficiency is improved, so that the temperature of the refrigerant entering the first compressor 110 can be quickly increased.

[0075] like Figure 3 As shown, in some embodiments of the present invention, the heat pump system includes a water side heat exchanger 200, 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 200 is used to output hot water; the water inlet end of the first water pump module 12 is connected to the water outlet end of the water side heat exchanger 200, and the water outlet end of the first water pump module 12 is connected to the water inlet end of the water side heat exchanger 200 to form a water circulation loop; the first valve body 13 is arranged in the water circulation loop; the first valve body 13 has a conducting state and a cut-off state; the first reserved interface 14 is located at the water inlet end of the first valve body 13; the second reserved interface 15 is located at the water 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.

[0076] In this embodiment, by reserving a first reserved interface 14 at the water inlet end of the first valve body 13 and a second reserved interface 15 at the water outlet end of the first valve body 13, when the first water pump module 12 is operating at its rated frequency and the actual temperature of the user terminal 19 still cannot reach the user's required temperature, the second water pump module 16 can be connected between the first reserved interface 14 and the second reserved interface 15, and at the same time, the first valve body 13 is switched from the on state to the off 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 started at the same time, which can increase the water output and water pressure of the heat pump system and make the actual temperature of the user terminal 19 reach the user's required temperature. Such a design can expand the scope of application of the heat pump system and improve user experience, and solve the problem that the heat pump system in the prior art cannot dynamically adjust the heating efficiency according to actual demand due to the fixed frequency water pump, resulting in a poor user experience.

[0077] That is, 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 based on 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 operating at its rated frequency, if the actual temperature of the user terminal 19 still cannot meet the user's needs, the user can connect the second water pump module 16 purchased separately to the first reserved interface 14 and the second reserved interface 15.

[0078] 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 on state to the off 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 off state back to the on state. The hot water discharged from the first water pump module 12 flows to the user end 19 after passing through the first valve body 13. 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 water outlet of the first water pump module 12.

[0079] Furthermore, the first valve body 13 may be a solenoid valve to facilitate automatic control.

[0080] like Figure 3 As shown, in some embodiments, the heat pump system further includes a user terminal 19; the water inlet of the user terminal 19 is connected to the water outlet of the first valve body 13, and the water outlet of the user terminal 19 is connected to the water inlet of the water-side heat exchanger 200. Hot water flowing out of the water-side heat exchanger 200 enters the user terminal 19, where it undergoes heat exchange, thereby providing indoor heating. The cooled hot water discharged from the user terminal 19 returns to the water-side heat exchanger 200 and continues to exchange heat with the refrigerant.

[0081] Furthermore, the user terminal 19 includes an indoor heat exchanger.

[0082] like Figure 4 As shown, in some embodiments, the heat pump system further includes a second water pump module 16; the water inlet of the second water pump module 16 is connected to the first reserved interface 14; and the water 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.

[0083] Optionally, the second water pump module 16 includes a second water pump body and a second water pump drive unit; the input end of the second water pump drive unit is electrically connected to the control module, and the output end of the second water pump drive unit is connected to the second water pump body. The second water pump drive unit is configured to control the second water pump body to stop or start according to control instructions issued by the control module.

[0084] Optionally, the second water pump drive unit and the second water pump body can be designed as an integrated system or as separate systems. For example, the second water pump drive unit and control module are located in the electrical control box, while the water inlet of the second water pump body is connected to the first reserved interface 14, and the water outlet of the second water pump body is connected to the second reserved interface 15. This design is characterized by the second water pump drive unit being designed separately from the second water pump body. For example, the second water pump drive unit is directly installed in the second water pump body, which is an integrated system.

[0085] Optionally, the second water pump drive unit includes a variable frequency drive board or a fixed frequency drive board.

[0086] like Figure 5 and Figure 6 As shown, in some embodiments, the heat pump system also includes a control module and a second switch module 17; the first output end of the control module is electrically connected to the first water pump module 12, for controlling the start and stop of the first water pump module 12; the second output end of the control module is electrically connected to the control end of the second switch module 17, for controlling the second switch module 17 to switch between a closed state and an open state; the second switch module 17 is also used to be electrically connected to the 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.

[0087] In this embodiment, by setting up a second switch module 17 electrically connected to the control module, and the second switch module 17 is also used to be electrically connected to the second water pump module 16, automatic control of powering on and off of the second water pump module 16 can be achieved, and automatic control of powering on and off of the second water pump module 16 can be achieved according to the actual operation conditions and actual needs of the system.

[0088] In addition, the first output end of the control module is electrically connected to the first water pump module 12 , so as to realize the control of starting and stopping the first water pump module 12 and realize the automatic control of the first water pump module 12 .

[0089] Optionally, the control module may be a microcontroller unit (MCU).

[0090] like Figure 6As shown, the second switch module 17 optionally includes a relay. The control terminal of the relay is connected to the second output terminal of the control module, and the relay is disposed 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, powering on and starting the second water pump module 16. When the relay is open, the current loop is disconnected, and the second water pump module 16 loses power.

[0091] Optionally, the control module and the second switch module 17 can both be installed in the electrical control box. The second switch module 17 serves as a switch reserved 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 switch module 17. In this way, the control module can be used to realize automatic control of the second water pump module 16.

[0092] like Figure 5 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 end of the control module is electrically connected to the input end of the first water pump drive unit; the first water pump body and the first water pump drive unit are arranged separately; the output end 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.

[0093] The water pumps of existing heat pump systems are usually modular and integrated in design, that is, the water pump drive plate is integrated with the water pump body. In the design of the heat pump system, it is necessary to purchase a modularly designed water pump, which not only increases the material cost of the heat pump system, but also increases the control cost of the heat pump system.

[0094] In this embodiment, the first water pump body and the first water pump driving unit are arranged separately, which can not only reduce material costs and maintenance costs, but also reduce control costs.

[0095] Optionally, the control module and the first water pump drive unit may both be arranged in an electrical control box.

[0096] Optionally, the first water pump drive unit includes a variable frequency drive board. By providing the variable frequency drive board, the operating frequency of the first water pump body can be adjusted to adjust the water pressure and water volume, and the heating capacity of the heat pump system can be adjusted according to actual user needs, thereby alleviating energy waste.

[0097] In some embodiments, the heat pump system further includes an electrical control box; the control module, the second switch module 17 and the first water pump drive unit are all installed in the electrical control box.

[0098] like Figure 5As shown, in some embodiments, the heat pump system further includes an information acquisition module; the information acquisition module is electrically connected to the input end of the control module; the information acquisition module is used to collect actual operating parameters of the heat pump system, and the actual operating parameters include at least one of the actual water outlet flow rate of the first water pump module 12, the water outlet temperature of the water side heat exchanger 200 and the water inlet temperature of the water side heat exchanger 200.

[0099] In this embodiment, actual operating parameters can be collected to determine the actual operating conditions of the system and provide a basis for the control module to adjust the first water pump module 12 and / or the second water pump module 16 to avoid blind adjustment.

[0100] 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 disposed at the outlet of the first water pump body to detect the outlet water flow rate at the outlet of the first water pump body. The outlet water temperature sensor is disposed at the outlet of the water-side heat exchanger 200 to detect the outlet water temperature at the outlet of the water-side heat exchanger 200. The inlet water temperature sensor is disposed at the inlet of the water-side heat exchanger 200 to detect the inlet water temperature at the inlet of the water-side heat exchanger 200.

[0101] like Figure 7 As shown, the second aspect of the present invention provides a control method for a heat pump system. The control method is applicable to the heat pump system of any of the above embodiments. The control method includes S100 and S200.

[0102] S100 , obtaining actual operating parameters of the heat pump system, where the actual operating parameters include at least one of the actual water outlet flow of the first water pump module 12 , the outlet water temperature of the water-side heat exchanger 200 , and the inlet water temperature of the water-side heat exchanger 200 .

[0103] Specifically, the information acquisition module is used to collect actual operating parameters of the heat pump system; the control module obtains the actual operating parameters from the information acquisition module.

[0104] Optionally, the information acquisition module includes a flow sensor disposed at the water outlet of the first water pump body for detecting the water flow rate at the water outlet of the first water pump body. The control module obtains the actual water flow rate at the water outlet of the first water pump body from the flow sensor.

[0105] Optionally, the information collection module includes a water outlet temperature sensor disposed at the water outlet of the water-side heat exchanger 200 for detecting the water outlet temperature of the water-side heat exchanger 200. The control module obtains the actual water outlet temperature of the water-side heat exchanger 200 from the water outlet temperature sensor.

[0106] Optionally, the information acquisition module includes an inlet water temperature sensor disposed at the water inlet of the water-side heat exchanger 200 for detecting the inlet water temperature of the water-side heat exchanger 200. The control module obtains the actual inlet water temperature of the water-side heat exchanger 200 from the inlet water temperature sensor.

[0107] It should be noted that the actual temperature of the user terminal 19 is related to the actual water outlet flow rate, the actual water outlet temperature and the actual water inlet temperature.

[0108] Optionally, the control module stores a corresponding relationship curve or corresponding relationship table between the actual temperature of the user terminal 19 and the actual water flow rate. In other words, the actual temperature of the user terminal 19 can be determined by the actual water flow rate, and thus it can be determined whether the actual temperature reaches the user's required temperature.

[0109] Optionally, the control module stores a corresponding relationship curve or corresponding relationship table between the actual temperature of the user terminal 19 and the actual water outlet temperature. In other words, the actual temperature of the user terminal 19 can be determined by the actual water outlet temperature, and thus it can be determined whether the actual temperature reaches the user's required temperature.

[0110] Optionally, the control module stores a corresponding relationship curve or corresponding relationship table between the actual temperature of the user terminal 19 and the actual water inlet temperature. In other words, the actual temperature of the user terminal 19 can be determined by the actual water outlet temperature, and thus it can be determined whether the actual temperature reaches the user's required temperature.

[0111] S200 , when the operating frequency of the first water pump module 12 reaches the frequency threshold and the actual operating parameter is still less than the required operating parameter, control the second switch module 17 to switch to a closed state to power on and start the second water pump module 16 .

[0112] In this embodiment, when the operating frequency of the first water pump module 12 reaches the frequency threshold and the actual operating parameters are still less than the required operating parameters, the control module controls the second switch module 17 to switch to the closed state, powering on the second water pump module 16. At this time, the first water pump module 12 and the second water pump module 16 are connected in series, increasing the actual operating parameters and allowing the actual temperature of the user terminal 19 to reach the user's required temperature. This design can expand the applicability of the heat pump system and enhance the user experience. It solves the problem that existing heat pump systems, which are equipped with fixed-frequency water pumps, cannot dynamically adjust the heating efficiency according to actual demand, resulting in a poor user experience.

[0113] It should be noted that the frequency threshold is not greater than the rated frequency of the first water pump module 12. Preferably, the frequency threshold refers to the rated frequency of the first water pump module 12.

[0114] Optionally, when the operating frequency of the first water pump module 12 reaches a frequency threshold and the actual water output at the water outlet of the first water pump body is still less than the required water output, the control module controls the second switch module 17 to switch from an open state to a closed state, at which point the second water pump module 16 is powered on and started. This design can increase the actual water output at the water outlet of the first water pump body, ensuring that the actual water output reaches at least the required water output, thereby ensuring that the actual temperature at the user terminal 19 reaches the user's required temperature.

[0115] In some embodiments, after obtaining the actual operating parameters of the heat pump system, the method further includes: If the operating frequency of the first water pump module 12 does not reach the frequency threshold, the operating frequency of the first water pump module 12 is adjusted based on actual operating parameters so that the actual operating parameters reach the desired operating parameters. Specifically, if the operating frequency of the first water pump module 12 does not reach the frequency threshold, the control module adjusts the operating frequency of the first water pump module 12 based on the relationship between the actual operating parameters and the desired operating parameters so that the actual operating parameters reach the desired operating parameters. This intelligent adjustment based on the actual operating status can improve the operating efficiency of the heat pump system and reduce energy consumption.

[0116] Optionally, if the operating frequency of the first water pump module 12 does not reach the frequency threshold, and the actual operating parameter is less than the required operating parameter, the control module controls the operating frequency of the first water pump module 12 to increase. If the actual operating parameter is greater than the required operating parameter, the control module controls the operating frequency of the first water pump module 12 to decrease. This ensures that the first water pump module 12 of the heat pump system can operate in an optimal state, improving the operating efficiency of the heat pump system and reducing energy consumption.

[0117] In some embodiments, before obtaining the actual operating parameters of the heat pump system, the method further includes: obtaining a real-time electrical signal of the first water pump module 12, the real-time electrical signal including a real-time voltage signal and / or a real-time current signal; the control method further includes: When the real-time electrical signal is not less than the electrical signal threshold, the first water pump module 12 is controlled to shut down. This design can achieve fault protection.

[0118] Optionally, when the real-time voltage signal is not less than the voltage signal threshold, the control module controls the first water pump module 12 to shut down to achieve fault protection.

[0119] Optionally, when the real-time current signal is not less than the current signal threshold, the control module controls the first water pump module 12 to shut down to achieve fault protection.

[0120] like Figure 8 As shown, in one embodiment of the present invention, the heat pump system control method of the present invention includes: S100, the control module obtains actual operating parameters of the heat pump system from the information acquisition module, and the control module also obtains the operating frequency of the first water pump module 12 from the first water pump module 12; S210, the control module determines whether the operating frequency of the first water pump module 12 reaches the frequency threshold; if so, proceed to S220; if not, proceed to S230; S220, the control module determines whether the actual operating parameter is less than the required operating parameter; if so, proceed to S250; if not, proceed to S260; S230, the control module determines whether the actual operating parameter is greater than the required operating parameter; if so, proceed to S270; if not, proceed to S260; S250 , the control module controls the second switch module 17 to switch to a closed state, so that the second water pump module 16 is powered on and started.

[0121] S260 , the control module controls the operating frequency of the first water pump module 12 to increase so that the actual operating parameters reach the required operating parameters.

[0122] S270 : The control module controls the operating frequency of the first water pump module 12 to decrease so that the actual operating parameters reach the required operating parameters.

[0123] In this embodiment, by dynamically connecting the second water pump module, the use range of the heat pump system can be expanded, and by adjusting the operating frequency of the first water pump module, energy consumption can be reduced and the operating efficiency of the heat pump can be improved.

[0124] A second aspect of the present invention provides a heat pump unit. The heat pump unit includes the heat pump system of any of the above-mentioned embodiments. Because it includes the heat pump system of any of the above-mentioned embodiments, it has at least the above-mentioned advantages, which will not be elaborated here.

[0125] Figure 9 An example of a physical structure diagram of an electronic device is shown below. Figure 9 As shown, the electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communications interface 820, and the memory 830 communicate with each other via the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute the control method of the heat pump system, which includes: S100, obtaining actual operating parameters of the heat pump system, the actual operating parameters including at least one of the actual water outlet flow of the first water pump module 12, the outlet water temperature of the water-side heat exchanger 200, and the inlet water temperature of the water-side heat exchanger 200; S200 , when the operating frequency of the first water pump module 12 reaches the frequency threshold and the actual operating parameter is still less than the required operating parameter, control the second switch module 17 to switch to a closed state to power on and start the second water pump module 16 .

[0126] Furthermore, the logic instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0127] On the other hand, the present invention further provides a computer program product, comprising a computer program. The computer program may be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can perform the control method of the heat pump system provided by the above methods, the method comprising: S100, obtaining actual operating parameters of the heat pump system, the actual operating parameters including at least one of the actual water outlet flow of the first water pump module 12, the outlet water temperature of the water-side heat exchanger 200, and the inlet water temperature of the water-side heat exchanger 200; S200 , when the operating frequency of the first water pump module 12 reaches the frequency threshold and the actual operating parameter is still less than the required operating parameter, control the second switch module 17 to switch to a closed state to power on and start the second water pump module 16 .

[0128] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the control method of the heat pump system provided by the above methods, the method comprising: S100, obtaining actual operating parameters of the heat pump system, the actual operating parameters including at least one of the actual water outlet flow of the first water pump module 12, the outlet water temperature of the water-side heat exchanger 200, and the inlet water temperature of the water-side heat exchanger 200; S200 , when the operating frequency of the first water pump module 12 reaches the frequency threshold and the actual operating parameter is still less than the required operating parameter, control the second switch module 17 to switch to a closed state to power on and start the second water pump module 16 .

[0129] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0130] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A heat pump system, characterized in that: include: a first compressor (110); a second compressor (120), wherein the exhaust port of the first compressor (110) is in communication with the intake port of the second compressor (120); A water-side heat exchanger (200) having a refrigerant flow channel; a first throttling assembly (300) and an air-side heat exchanger (400), wherein the exhaust port of the second compressor (120) is connected to the intake port of the first compressor (110) through the refrigerant flow channel, the first throttling assembly (300) and the air-side heat exchanger (400) in sequence to form a refrigerant circulation loop; A first switch valve (500), wherein both ends of the first switch valve (500) are respectively connected to the intake port and the exhaust port of the first compressor (110), or the both ends of the first switch valve (500) are respectively connected to the intake port and the exhaust port of the second compressor (120).

2. The heat pump system according to claim 1, characterized in that Also includes: A power source (610), the power source (610) being connected to the refrigerant circulation loop and used to provide circulating power for the refrigerant; A second switch valve (620), wherein both ends of the second switch valve (620) are respectively connected to the inlet and outlet of the power source (610).

3. The heat pump system according to claim 2, characterized in that The inlet of the power source (610) is in communication with the first throttling assembly (300), and the outlet of the power source (610) is in communication with the air-side heat exchanger (400).

4. The heat pump system according to claim 1, characterized in that Also includes: A first heat exchanger (710) has a first flow channel and a second flow channel; one end of the first flow channel is in communication with the refrigerant flow channel, and the other end of the first flow channel is in communication with the first throttling assembly (300); A second throttling component (720) and a first air supply pipe (730), one end of the second flow channel is connected to the refrigerant flow channel through the second throttling component (720), and the other end of the second flow channel is connected to the air supply port of the first compressor (110) through the first air supply pipe (730).

5. The heat pump system according to claim 4, characterized in that Also includes: The third throttling component (740) is arranged on the first air supply pipe (730).

6. The heat pump system according to claim 5, characterized in that Also includes: a second air supply pipe (750), one end of the second air supply pipe (750) being in communication with the air intake port of the second compressor (120), and the other end of the second air supply pipe (750) being in communication with the other end of the second flow channel; The third switch valve (760) is provided on the second air supply pipe (750) and is connected in parallel with the third throttling component (740).

7. The heat pump system according to any one of claims 1 to 6, characterized in that: Also includes: A four-way valve (800), wherein the D port of the four-way valve (800) is connected to the exhaust port of the second compressor (120), the C port of the four-way valve (800) is connected to the refrigerant flow channel of the water-side heat exchanger (200), the E port of the four-way valve (800) is connected to the air-side heat exchanger (400), and the S port of the four-way valve (800) is connected to the intake port of the first compressor (110).

8. The heat pump system according to claim 7, characterized in that Also includes: A temperature raising component is provided at the air intake of the first compressor (110) and is used to raise the refrigerant temperature at the air intake of the first compressor (110).

9. The heat pump system according to claim 8, characterized in that The heating component comprises: The second heat exchanger (910) has a third flow channel and a fourth flow channel; the S port of the four-way valve (800) is connected to the air intake port of the first compressor (110) through the third flow channel, and the exhaust port of the first compressor (110) is connected to the air intake port of the second compressor (120) through the fourth flow channel.

10. A heat pump unit, characterized in that: A heat pump system comprising any one of claims 1 to 9.

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