A heat pump system

Abstract

The application discloses a heat pump system and relates to the technical field of heat pumps. The heat pump system comprises an evaporator, a first compressor, a gas cooler, an intermediate cooler, a second compressor, a condenser and a heating pipeline. The heating pipeline is connected with the gas cooler and the condenser in sequence, and the heating pipeline is used for flowing target water. The first compressor is used for compressing first refrigerant from low-pressure gas state to intermediate-pressure gas state. The gas cooler is used for exchanging heat between the intermediate-pressure gas state first refrigerant and the target water, so as to preliminarily heat the target water. The second compressor is used for compressing second refrigerant from intermediate-pressure gas state to high-pressure gas state. The condenser is used for heat releasing of the high-pressure gas state second refrigerant to condense the high-pressure gas state second refrigerant into high-pressure liquid state second refrigerant, so as to heat the target water again. The heat pump system provided by the application can realize effective utilization of energy, improve the energy efficiency ratio, save energy and protect the environment, improve the heating efficiency, guarantee the heating effect, prevent the compressor from overloading and improve the safety.

Description

Technical Field

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

[0002] Currently, heat pump systems achieve "reverse heat transfer" through the phase change cycle of the refrigerant and external work. Their high efficiency and energy-saving characteristics make them widely used in heating, cooling, and hot water supply, especially suitable for scenarios pursuing low-carbon and environmentally friendly practices. When heating target water, current heat pump systems typically use the condenser to directly release heat from the high-temperature, high-pressure gaseous refrigerant to the target water, thus raising its temperature. However, if the required heating temperature is high, this necessitates increasing the power of the compressor in the heat pump system, leading to a lower energy efficiency ratio, increased energy consumption, and even compressor overload, resulting in poor safety. Summary of the Invention

[0003] The problem solved by this invention is how to achieve efficient energy utilization, improve energy efficiency ratio, save energy and protect the environment, improve heating efficiency, ensure heating effect, prevent compressor overload, and improve safety.

[0004] To solve the above problems, the technical solution of the present invention is implemented as follows:

[0005] This invention provides a heat pump system, including an evaporator, a first compressor, a gas cooler, an intercooler, a second compressor, a condenser, and heating pipes. The evaporator, first compressor, gas cooler, and intercooler are connected end-to-end to form a first circulation pipe, and the second compressor, condenser, and intercooler are connected end-to-end to form a second circulation pipe. The first circulation pipe is used to supply a first refrigerant, and the second circulation pipe is used to supply a second refrigerant. The intercooler is used to exchange heat between the first and second refrigerants. The heating pipes are connected sequentially to the gas cooler and the condenser and are used to supply target water. The first compressor is used to compress the first refrigerant from a low-pressure gaseous state to an intermediate-pressure gaseous state. The gas cooler is used to exchange heat between the intermediate-pressure gaseous first refrigerant and the target water to initially heat the target water. The second compressor is used to compress the second refrigerant from an intermediate-pressure gaseous state to a high-pressure gaseous state. The condenser is used to release heat and condense the high-pressure gaseous second refrigerant into a high-pressure liquid second refrigerant to reheat the target water. Compared with the prior art, the heat pump system provided by the present invention, by adopting a first circulation pipeline and a second circulation pipeline connected through an intercooler, as well as a heating pipeline connected in sequence to a gas cooler and a condenser, can achieve efficient energy utilization, improve the energy efficiency ratio, save energy and protect the environment, improve heating efficiency, ensure heating effect, prevent compressor overload, and improve safety.

[0006] Furthermore, the heat pump system also includes a first throttling device and a second throttling device. The first throttling device is installed in the first circulation pipeline and located between the intercooler and the evaporator. The first throttling device is used to throttle the intermediate-pressure liquid first refrigerant flowing from the intercooler into a low-pressure liquid first refrigerant and send it to the evaporator. The second throttling device is installed in the second circulation pipeline and located between the condenser and the intercooler. The second throttling device is used to throttle the high-pressure liquid second refrigerant flowing from the condenser into an intermediate-pressure liquid second refrigerant and send it to the intercooler. This achieves the throttling function.

[0007] Furthermore, the intercooler is equipped with a first heat exchange pipe and a second heat exchange pipe. The first heat exchange pipe is connected to the first circulation pipe, and the second heat exchange pipe is connected to the second circulation pipe. The inlet of the first heat exchange pipe is connected to the gas cooler, and the outlet of the first heat exchange pipe is connected to the first throttling device. The inlet of the second heat exchange pipe is connected to the second throttling device, and the outlet of the second heat exchange pipe is connected to the second compressor. The intermediate-pressure gaseous first refrigerant is converted into an intermediate-pressure liquid first refrigerant through the first heat exchange pipe, and the intermediate-pressure liquid second refrigerant is converted into an intermediate-pressure gaseous second refrigerant through the second heat exchange pipe.

[0008] Furthermore, the heat pump system also includes a first temperature sensor and a second temperature sensor. Both the first temperature sensor and the second temperature sensor are installed in the second circulation pipeline. The first temperature sensor is located between the second compressor and the condenser, and the second temperature sensor is located between the condenser and the second throttling device. The first temperature sensor is used to detect the temperature of the high-pressure gaseous second refrigerant, and the second temperature sensor is used to detect the temperature of the high-pressure liquid second refrigerant.

[0009] Furthermore, the heat pump system also includes a first controller, which is connected to a first temperature sensor, a second temperature sensor, and a second throttling device. The first controller is used to adjust the opening of the second throttling device so that the subcooling degree corresponding to the temperature difference between the high-pressure liquid second refrigerant and the high-pressure gaseous second refrigerant reaches a preset subcooling degree. This improves the energy efficiency ratio and reduces energy consumption.

[0010] Furthermore, the heat pump system also includes a third temperature sensor and a fourth temperature sensor, both of which are installed in the first circulation pipeline. The third temperature sensor is located between the first throttling device and the evaporator, and the fourth temperature sensor is located between the evaporator and the first compressor. The third temperature sensor is used to detect the temperature of the low-pressure liquid first refrigerant, and the fourth temperature sensor is used to detect the temperature of the low-pressure gaseous first refrigerant.

[0011] Furthermore, the heat pump system also includes a second controller, which is electrically connected to a third temperature sensor, a fourth temperature sensor, and a first throttling device. The second controller is used to adjust the opening of the first throttling device so that the superheat corresponding to the temperature difference between the low-pressure gaseous first refrigerant and the low-pressure liquid first refrigerant reaches a preset superheat. This improves the energy efficiency ratio and reduces energy consumption.

[0012] Furthermore, the heat pump system also includes a fifth temperature sensor and a third controller. The heating pipe has an outlet end, where the fifth temperature sensor is installed. The third controller is electrically connected to both the fifth temperature sensor and the second compressor. The fifth temperature sensor detects the temperature of the target water at the outlet end, and the third controller adjusts the power of the second compressor based on the target water temperature to ensure that the target water temperature at the outlet reaches the preset temperature. This guarantees that the outlet water temperature of the heating pipe meets the user's requirements.

[0013] Furthermore, the heat pump system also includes a sixth temperature sensor and a pressure sensor. The heating pipeline is provided with a water inlet, and the sixth temperature sensor is installed at the water inlet. The sixth temperature sensor is used to detect the temperature of the target water in the water inlet. The pressure sensor is installed in the first circulation pipeline and is located between the first compressor and the gas cooler. The pressure sensor is used to detect the gas pressure of the intermediate-pressure gaseous first refrigerant output by the first compressor.

[0014] Furthermore, the heat pump system also includes a fourth controller, which is electrically connected to a sixth temperature sensor, a pressure sensor, and a first compressor. The fourth controller is used to adjust the power of the first compressor based on the gas pressure of the intermediate-pressure gaseous first refrigerant, so that the gas pressure of the intermediate-pressure gaseous first refrigerant reaches the saturation pressure corresponding to the temperature of the target water in the inlet. This maximizes the preheating effect of the gas cooler on the target water. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the heat pump system described in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures:

[0017] 100 - Heat pump system; 110 - Evaporator; 120 - First compressor; 130 - Gas cooler; 140 - Intercooler; 141 - First heat exchange pipeline; 142 - Second heat exchange pipeline; 150 - Second compressor; 160 - Condenser; 170 - Heating pipeline; 171 - Water inlet; 172 - Water outlet; 180 - First circulation pipeline; 190 - Second circulation pipeline; 200 - Heat source pipeline; 210 - First throttling device; 220 - Second throttling device; 230 - First temperature sensor; 240 - Second temperature sensor; 250 - First controller; 260 - Third temperature sensor; 270 - Fourth temperature sensor; 280 - Second controller; 290 - Fifth temperature sensor; 300 - Third controller; 310 - Sixth temperature sensor; 320 - Pressure sensor; 330 - Fourth controller. Detailed Implementation

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] Please refer to Figure 1 ( Figure 1 (The solid arrows in the diagram indicate the direction of water flow, while the dashed arrows indicate the direction of data transmission or circuit control.) This embodiment of the invention provides a heat pump system 100 for heat energy transfer. It enables efficient energy utilization, improves the energy efficiency ratio, saves energy and protects the environment, increases heating efficiency, ensures heating effect, and prevents compressor overload, thus improving safety.

[0020] The heat pump system 100 includes an evaporator 110, a first compressor 120, a gas cooler 130, an intercooler 140, a second compressor 150, a condenser 160, and heating pipes 170. The evaporator 110, first compressor 120, gas cooler 130, and intercooler 140 are connected end-to-end, forming a first circulation pipe 180. The second compressor 150, condenser 160, and intercooler 140 are connected end-to-end, forming a second circulation pipe 190. The first circulation pipe 180 supplies the flow of a first refrigerant, and the second circulation pipe 190 supplies the flow of a second refrigerant. The intercooler 140 exchanges heat between the first and second refrigerants. During this process, the intermediate-pressure gaseous first refrigerant releases heat and condenses into an intermediate-pressure liquid first refrigerant, while the intermediate-pressure liquid second refrigerant absorbs heat and evaporates into an intermediate-pressure gaseous second refrigerant. Heating pipe 170 is connected sequentially to gas cooler 130 and condenser 160. Heating pipe 170 is used to supply target water flow; that is, the target water in heating pipe 170 flows sequentially through gas cooler 130 and condenser 160. Specifically, the power of the first compressor 120 is lower than that of the second compressor 150. The first compressor 120 is used to compress the first refrigerant from a low-pressure gaseous state to an intermediate-pressure gaseous state. Since the gaseous refrigerant heats up during compression, the temperature of the intermediate-pressure gaseous first refrigerant is higher. Gas cooler 130 is used to exchange heat between the intermediate-pressure gaseous first refrigerant and the target water to initially heat the target water. After heat exchange, the temperature of the target water initially rises, while the temperature of the intermediate-pressure gaseous first refrigerant decreases, thus achieving preheating of the target water. The second compressor 150 is used to compress the second refrigerant from an intermediate-pressure gaseous state to a high-pressure gaseous state. Similarly, since the gaseous refrigerant heats up during compression, the temperature of the high-pressure gaseous second refrigerant reaches its maximum. The condenser 160 is used to condense the high-pressure gaseous second refrigerant into a high-pressure liquid second refrigerant to reheat the target water, thus achieving secondary heating of the target water. In this way, through the preheating of the target water by the gas cooler 130 and the reheating of the target water by the condenser 160, energy can be used efficiently, improving the energy efficiency ratio, saving energy and protecting the environment, improving heating efficiency, ensuring heating effect, and because it undergoes two compression processes (compression by the first compressor 120 and the second compressor 150 respectively), the power of a single compression is reduced, thus avoiding compressor overload and improving safety.

[0021] Preferably, the heat pump system 100 further includes a heat source pipe 200. The heat source pipe 200 is connected to the evaporator 110, and the heat source pipe is used to supply heat source water. The evaporator 110 is used to exchange heat between the first refrigerant and the heat source water to heat the first refrigerant, thereby increasing the temperature of the first refrigerant and decreasing the temperature of the heat source water. Specifically, the heat source water can come from various sources, such as waste water discharged during the refrigeration process of the chiller or geothermal water. Since the temperature of the heat source water is higher than the temperature of the first refrigerant in the evaporator 110, the heat from the heat source water will be transferred to the first refrigerant in the evaporator 110 through heat transfer, thereby increasing the heat absorption temperature of the first refrigerant.

[0022] In this embodiment, during the operation of the evaporator 110, the evaporator 110 can absorb heat and evaporate the low-pressure liquid first refrigerant into a low-pressure gaseous first refrigerant. In this process, the heat source is heat source water. However, it is not limited to this. In other embodiments, the heat source can be air (similar to the air conditioning cooling function, where the first refrigerant absorbs heat from the indoor air). The heat source is not specifically limited.

[0023] It should be noted that during the preheating of the target water using the gas cooler 130, the amount of heat generated is equal to a portion of the heat absorbed by the first refrigerant (the heat absorbed by the first refrigerant from the heat source water in the evaporator 110) plus a portion of the heat generated by the first compressor 120 compressing the gaseous first refrigerant. During the heat exchange between the first and second refrigerants using the intercooler 140, the heat exchange between the first and second refrigerants (i.e., the heat released by the first refrigerant / the heat absorbed by the second refrigerant) is equal to the remaining heat absorbed by the first refrigerant (the heat absorbed by the first refrigerant from the heat source water in the evaporator 110) plus the remaining heat generated by the first compressor 120 compressing the gaseous first refrigerant. During the secondary heating of the target water using the condenser 160, the amount of heat generated is equal to the heat absorbed by the second refrigerant (the heat absorbed by the second refrigerant from the first refrigerant in the intercooler 140) and the total heat generated by the second compressor 150 compressing the gaseous second refrigerant. In this way, by heating twice, all the heat generated by the heat pump system 100 can be transferred to the target water, effectively improving heating efficiency, enhancing heating effect, and increasing energy efficiency ratio.

[0024] It is worth noting that the heat pump system 100 also includes a first throttling device 210 and a second throttling device 220. The first throttling device 210 is installed in the first circulation pipe 180 and is located between the intercooler 140 and the evaporator 110. The first throttling device 210 throttles the intermediate-pressure liquid first refrigerant flowing out of the intercooler 140 into a low-pressure liquid first refrigerant and sends it to the evaporator 110 to achieve the throttling function. The second throttling device 220 is installed in the second circulation pipe 190 and is located between the condenser 160 and the intercooler 140. The second throttling device 220 is used to throttle the high-pressure liquid second refrigerant flowing out of the condenser 160 into an intermediate-pressure liquid second refrigerant and send it to the intercooler 140 to achieve the throttling function. In this embodiment, both the first throttling device 210 and the second throttling device 220 are expansion valves, but they are not limited to this. In other embodiments, both the first throttling device 210 and the second throttling device 220 can be capillary tubes, and the types of the first throttling device 210 and the second throttling device 220 are not specifically limited.

[0025] In this embodiment, the intercooler 140 is provided with a first heat exchange pipe 141 and a second heat exchange pipe 142. The first heat exchange pipe 141 and the second heat exchange pipe 142 are closely fitted together to facilitate heat exchange and improve the heat exchange effect. Specifically, the first heat exchange pipe 141 is connected to the first circulation pipe 180, and the second heat exchange pipe 142 is connected to the second circulation pipe 190. The first heat exchange pipe 141 is used to supply the flow of the first refrigerant, and the second heat exchange pipe 142 is used to supply the flow of the second refrigerant. The inlet of the first heat exchange pipe 141 is connected to the gas cooler 130, and the outlet of the first heat exchange pipe 141 is connected to the first throttling device 210, that is, the intermediate-pressure gaseous first refrigerant is converted into an intermediate-pressure liquid first refrigerant through the first heat exchange pipe 141. The inlet of the second heat exchange pipeline 142 is connected to the second throttling device 220, and the outlet of the second heat exchange pipeline 142 is connected to the second compressor 150. That is, the intermediate-pressure liquid second refrigerant is converted into intermediate-pressure gaseous second refrigerant through the second heat exchange pipeline 142.

[0026] Preferably, the heat pump system 100 further includes a first temperature sensor 230, a second temperature sensor 240, and a first controller 250. Both the first temperature sensor 230 and the second temperature sensor 240 are installed in the second circulation pipe 190. The first temperature sensor 230 is located between the second compressor 150 and the condenser 160, and the second temperature sensor 240 is located between the condenser 160 and the second throttling device 220. The first temperature sensor 230 is used to detect the temperature of the high-pressure gaseous second refrigerant, and the second temperature sensor 240 is used to detect the temperature of the high-pressure liquid second refrigerant. The first controller 250 is simultaneously connected to the first temperature sensor 230, the second temperature sensor 240, and the second throttling device 220. The first temperature sensor 230 is used to send the detected temperature data to the first controller 250, and the second temperature sensor 240 is used to send the detected temperature data to the first controller 250. The first controller 250 is used to adjust the opening of the second throttling device 220 so that the subcooling degree corresponding to the temperature difference between the high-pressure liquid second refrigerant and the high-pressure gaseous second refrigerant reaches the preset subcooling degree, thereby improving the energy efficiency ratio and reducing energy consumption.

[0027] Preferably, the heat pump system 100 further includes a third temperature sensor 260, a fourth temperature sensor 270, and a second controller 280. Both the third temperature sensor 260 and the fourth temperature sensor 270 are installed in the first circulation pipe 180. The third temperature sensor 260 is located between the first throttling device 210 and the evaporator 110, and the fourth temperature sensor 270 is located between the evaporator 110 and the first compressor 120. The third temperature sensor 260 is used to detect the temperature of the low-pressure liquid first refrigerant, and the fourth temperature sensor 270 is used to detect the temperature of the low-pressure gaseous first refrigerant. The second controller 280 is electrically connected to the third temperature sensor 260, the fourth temperature sensor 270, and the first throttling device 210. The third temperature sensor 260 is used to send the detected temperature data to the second controller 280, and the fourth temperature sensor 270 is used to send the detected temperature data to the second controller 280. The second controller 280 is used to adjust the opening of the first throttling device 210 so that the superheat corresponding to the temperature difference between the low-pressure gaseous first refrigerant and the low-pressure liquid first refrigerant reaches the preset superheat, thereby improving the energy efficiency ratio and reducing energy consumption.

[0028] Preferably, the heat pump system 100 further includes a fifth temperature sensor 290 and a third controller 300. The heating pipe 170 is provided with an outlet end 172. The fifth temperature sensor 290 is installed at the outlet end 172 and is used to detect the temperature of the target water in the outlet end 172, i.e., the fifth temperature sensor 290 is used to detect the outlet water temperature of the heating pipe 170. The third controller 300 is electrically connected to both the fifth temperature sensor 290 and the second compressor 150. The fifth temperature sensor 290 is used to send the detected temperature data to the third controller 300. The third controller 300 is used to adjust the power of the second compressor 150 according to the target water temperature in the outlet end 172, so that the target water temperature in the outlet end 172 reaches the preset temperature, ensuring that the outlet water temperature of the heating pipe 170 meets the user's requirements.

[0029] Preferably, the heat pump system 100 further includes a sixth temperature sensor 310, a pressure sensor 320, and a fourth controller 330. The heating pipe 170 is provided with a water inlet 171, and the sixth temperature sensor 310 is installed at the water inlet 171. The sixth temperature sensor 310 is used to detect the temperature of the target water in the water inlet 171, that is, the sixth temperature sensor 310 is used to detect the inlet water temperature of the heating pipe 170. The pressure sensor 320 is installed in the first circulation pipe 180 and is located between the first compressor 120 and the gas cooler 130. The pressure sensor 320 is used to detect the gas pressure of the intermediate-pressure gaseous first refrigerant output by the first compressor 120. The fourth controller 330 is electrically connected to the sixth temperature sensor 310, the pressure sensor 320, and the first compressor 120. The sixth temperature sensor 310 is used to send the detected temperature data to the fourth controller 330, and the pressure sensor 320 is used to send the detected gas pressure data to the fourth controller 330. The fourth controller 330 is used to adjust the power of the first compressor 120 according to the gas pressure of the intermediate pressure gaseous first refrigerant, so that the gas pressure of the intermediate pressure gaseous first refrigerant reaches the saturation gas pressure corresponding to the temperature of the target water in the water inlet 171, thereby maximizing the preheating effect of the gas cooler 130 on the target water.

[0030] It should be noted that during the operation of the heat pump system 100, in the first circulation pipe 180, the evaporator 110 first evaporates the low-pressure liquid first refrigerant into a low-pressure gaseous first refrigerant. During this process, the gaseous first refrigerant absorbs heat from the heat source water. Subsequently, the first compressor 120 compresses the low-pressure gaseous first refrigerant into an intermediate-pressure gaseous first refrigerant. During this process, the temperature of the gaseous first refrigerant increases during compression. Then, the gas cooler 130 exchanges heat between the intermediate-pressure gaseous first refrigerant and the target water flowing into the heating pipe 170, so that the intermediate-pressure gaseous first refrigerant... The temperature of the first refrigerant decreases, while the temperature of the target water increases, thus preheating the target water. The cooled intermediate-pressure gaseous first refrigerant enters the intercooler 140 to exchange heat with the intermediate-pressure liquid second refrigerant, causing the intermediate-pressure gaseous first refrigerant to release heat and condense into intermediate-pressure liquid first refrigerant, while the intermediate-pressure liquid second refrigerant absorbs heat and evaporates into intermediate-pressure gaseous second refrigerant. Then, the first throttling device 210 throttles the intermediate-pressure liquid first refrigerant into low-pressure liquid first refrigerant and sends it to the evaporator 110 to achieve the phase change cycle of the first refrigerant. In the second circulation pipeline 190, the second compressor 150 compresses the intermediate-pressure gaseous second refrigerant output from the intercooler 140 into a high-pressure gaseous second refrigerant. During this process, the temperature of the gaseous second refrigerant increases during compression. Then, the condenser 160 condenses the high-pressure gaseous second refrigerant into a high-pressure liquid second refrigerant. During this process, the second refrigerant releases heat to the heating pipeline 170, thereby raising the temperature of the target water in the heating pipeline 170 and achieving secondary heating of the target water. Then, the second throttling device 220 throttles the high-pressure liquid second refrigerant into an intermediate-pressure liquid second refrigerant and sends it to the intercooler 140 to achieve a phase change cycle of the second refrigerant.

[0031] The heat pump system 100 described in this embodiment of the invention comprises an evaporator 110, a first compressor 120, a gas cooler 130, and an intercooler 140 connected end-to-end to form a first circulation pipeline 180. A second compressor 150, a condenser 160, and the intercooler 140 are also connected end-to-end to form a second circulation pipeline 190. The first circulation pipeline 180 supplies a first refrigerant, the second circulation pipeline 190 supplies a second refrigerant, and the intercooler 140 facilitates heat exchange between the first and second refrigerants. (Heating pipeline...) The heating pipe 170 is sequentially connected to the gas cooler 130 and the condenser 160. The heating pipe 170 supplies water to the target water. The first compressor 120 compresses the first refrigerant from a low-pressure gaseous state to an intermediate-pressure gaseous state. The gas cooler 130 exchanges heat between the intermediate-pressure gaseous first refrigerant and the target water for initial heating. The second compressor 150 compresses the second refrigerant from an intermediate-pressure gaseous state to a high-pressure gaseous state. The condenser 160 releases heat and condenses the high-pressure gaseous second refrigerant into a high-pressure liquid second refrigerant for further heating the target water. Compared with existing technologies, the heat pump system 100 provided by this invention, due to the use of the first circulation pipe 180 and the second circulation pipe 190 connected via the intercooler 140, and the heating pipe 170 sequentially connected to the gas cooler 130 and the condenser 160, can achieve efficient energy utilization, improve the energy efficiency ratio, save energy and protect the environment, improve heating efficiency, ensure heating effect, prevent compressor overload, and improve safety.

[0032] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A heat pump system, characterized in that, The system includes an evaporator (110), a first compressor (120), a gas cooler (130), an intercooler (140), a second compressor (150), a condenser (160), and heating pipes (170). The evaporator (110), the first compressor (120), the gas cooler (130), and the intercooler (140) are connected end-to-end to form a first circulation pipe (180). The second compressor (150), the condenser (160), and the intercooler (140) are connected end-to-end to form a second circulation pipe (190). The first circulation pipe (180) is used to supply the first refrigerant, and the second circulation pipe (190) is used to supply the second refrigerant. The flow is as follows: the intercooler (140) is used to exchange heat between the first refrigerant and the second refrigerant; the heating pipe (170) is connected in sequence to the gas cooler (130) and the condenser (160); the heating pipe (170) is used to supply the target water flow; the first compressor (120) is used to compress the first refrigerant from a low-pressure gaseous state to an intermediate-pressure gaseous state; the gas cooler (130) is used to exchange heat between the intermediate-pressure gaseous first refrigerant and the target water to initially heat the target water; the second compressor (150) is used to compress the second refrigerant from an intermediate-pressure gaseous state to a high-pressure gaseous state; and the condenser (160) is used to release heat from the high-pressure gaseous second refrigerant and condense it into a high-pressure liquid second refrigerant to reheat the target water.

2. The heat pump system according to claim 1, characterized in that, The heat pump system further includes a first throttling device (210) and a second throttling device (220). The first throttling device (210) is installed in the first circulation pipe (180) and is located between the intercooler (140) and the evaporator (110). The first throttling device (210) is used to throttle the intermediate-pressure liquid first refrigerant flowing out of the intercooler (140) into a low-pressure liquid first refrigerant and send it to the evaporator (110). The second throttling device (220) is installed in the second circulation pipe (190) and is located between the condenser (160) and the intercooler (140). The second throttling device (220) is used to throttle the high-pressure liquid second refrigerant flowing out of the condenser (160) into an intermediate-pressure liquid second refrigerant and send it to the intercooler (140).

3. The heat pump system according to claim 2, characterized in that, The intercooler (140) is provided with a first heat exchange pipeline (141) and a second heat exchange pipeline (142). The first heat exchange pipeline (141) is connected to the first circulation pipeline (180), and the second heat exchange pipeline (142) is connected to the second circulation pipeline (190). The inlet of the first heat exchange pipeline (141) is connected to the gas cooler (130), the outlet of the first heat exchange pipeline (141) is connected to the first throttling device (210), the inlet of the second heat exchange pipeline (142) is connected to the second throttling device (220), and the outlet of the second heat exchange pipeline (142) is connected to the second compressor (150).

4. The heat pump system according to claim 2, characterized in that, The heat pump system further includes a first temperature sensor (230) and a second temperature sensor (240). Both the first temperature sensor (230) and the second temperature sensor (240) are installed in the second circulation pipeline (190). The first temperature sensor (230) is located between the second compressor (150) and the condenser (160), and the second temperature sensor (240) is located between the condenser (160) and the second throttling device (220). The first temperature sensor (230) is used to detect the temperature of the high-pressure gaseous second refrigerant, and the second temperature sensor (240) is used to detect the temperature of the high-pressure liquid second refrigerant.

5. The heat pump system according to claim 4, characterized in that, The heat pump system further includes a first controller (250), which is connected to the first temperature sensor (230), the second temperature sensor (240), and the second throttling device (220). The first controller (250) is used to adjust the opening of the second throttling device (220) so that the subcooling degree corresponding to the temperature difference between the high-pressure liquid second refrigerant and the high-pressure gaseous second refrigerant reaches a preset subcooling degree.

6. The heat pump system according to claim 2, characterized in that, The heat pump system further includes a third temperature sensor (260) and a fourth temperature sensor (270). Both the third temperature sensor (260) and the fourth temperature sensor (270) are installed in the first circulation pipeline (180). The third temperature sensor (260) is located between the first throttling device (210) and the evaporator (110). The fourth temperature sensor (270) is located between the evaporator (110) and the first compressor (120). The third temperature sensor (260) is used to detect the temperature of the low-pressure liquid first refrigerant, and the fourth temperature sensor (270) is used to detect the temperature of the low-pressure gaseous first refrigerant.

7. The heat pump system according to claim 6, characterized in that, The heat pump system further includes a second controller (280), which is electrically connected to the third temperature sensor (260), the fourth temperature sensor (270), and the first throttling device (210). The second controller (280) is used to adjust the opening of the first throttling device (210) so that the superheat corresponding to the temperature difference between the low-pressure gaseous first refrigerant and the low-pressure liquid first refrigerant reaches a preset superheat.

8. The heat pump system according to claim 1, characterized in that, The heat pump system also includes a fifth temperature sensor (290) and a third controller (300). The heating pipe (170) is provided with a water outlet (172). The fifth temperature sensor (290) is installed at the water outlet (172). The third controller (300) is electrically connected to both the fifth temperature sensor (290) and the second compressor (150). The fifth temperature sensor (290) is used to detect the temperature of the target water in the water outlet (172). The third controller (300) is used to adjust the power of the second compressor (150) according to the temperature of the target water in the water outlet (172) so that the temperature of the target water in the water outlet (172) reaches the preset temperature.

9. The heat pump system according to claim 1, characterized in that, The heat pump system further includes a sixth temperature sensor (310) and a pressure sensor (320). The heating pipe (170) is provided with a water inlet (171). The sixth temperature sensor (310) is installed at the water inlet (171) and is used to detect the temperature of the target water in the water inlet (171). The pressure sensor (320) is installed in the first circulation pipe (180) and is located between the first compressor (120) and the gas cooler (130). The pressure sensor (320) is used to detect the gas pressure of the intermediate-pressure gaseous first refrigerant output by the first compressor (120).

10. The heat pump system according to claim 9, characterized in that, The heat pump system also includes a fourth controller (330), which is electrically connected to the sixth temperature sensor (310), the pressure sensor (320) and the first compressor (120). The fourth controller (330) is used to adjust the power of the first compressor (120) according to the gas pressure of the intermediate-pressure gaseous first refrigerant so that the gas pressure of the intermediate-pressure gaseous first refrigerant reaches the saturation pressure corresponding to the temperature of the target water in the water inlet (171).

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