Multi-connected heat pump system

Abstract

This invention relates to the field of heat pump technology, specifically to a multi-unit heat pump system. This application aims to solve the problem of low operating efficiency in existing multi-unit heat pumps. To this end, the multi-unit heat pump system of this application includes: a thermoelectric generator having a cold-end heat exchanger and a hot-end heat exchanger; a first compressor, a cold-end heat exchanger, a first throttling element, and a first outdoor heat exchange section, circulated and connected through a first refrigerant pipeline; a second compressor, a first indoor heat exchanger, a second throttling element, and a hot-end heat exchanger, circulated and connected through a second refrigerant pipeline; a second indoor heat exchanger disposed in a third refrigerant pipeline, the two ends of which are respectively connected to a second refrigerant pipeline between the second throttling element and the hot-end heat exchanger, and a second refrigerant pipeline between the hot-end heat exchanger and the suction port of the second compressor; and a first valve section capable of controlling the flow of refrigerant through the hot-end heat exchanger or the second indoor heat exchanger. This application can improve the operating efficiency of the heat pump system and expand the system's application scenarios.

Description

Technical Field

[0001] This invention relates to the field of heat pump technology, and more specifically to a multi-generation heat pump system. Background Technology

[0002] A multi-split heat pump is a heat pump unit that can provide at least two of the three functions of air conditioning, underfloor heating and hot water. Because multi-split heat pumps can integrate multiple functions into one unit and have advantages such as high efficiency, energy saving, environmental protection and safety, they are increasingly favored by users.

[0003] For traditional vapor compression multi-generation heat pumps, their operating efficiency is closely related to the ambient temperature. As the ambient temperature decreases, the evaporation pressure of the system decreases, which not only reduces the heating capacity and efficiency, but in severe cases, it can also cause the compressor's compression ratio and exhaust temperature to exceed the standard, making the system unable to work.

[0004] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] To address at least one of the aforementioned problems in the prior art, namely, to solve the problem of low operating efficiency in existing multi-unit heat pumps, this application provides a multi-unit heat pump system, comprising:

[0006] A thermoacoustic machine having a cold-end heat exchanger and a hot-end heat exchanger;

[0007] The first compressor, the first outdoor heat exchange unit, and the first throttling element are connected in a circulating manner through a first refrigerant pipeline.

[0008] The system comprises a second compressor, a first indoor heat exchanger, a second indoor heat exchanger, a second throttling element, and a first valve. The second compressor, the first indoor heat exchanger, the second throttling element, and the hot-end heat exchanger are circulated and connected via a second refrigerant pipeline. The second indoor heat exchanger is located on a third refrigerant pipeline. The first end of the third refrigerant pipeline is connected to a second refrigerant pipeline between the second throttling element and one end of the hot-end heat exchanger. The second end of the third refrigerant pipeline is connected to a second refrigerant pipeline between the other end of the hot-end heat exchanger and the suction port of the second compressor. The first valve is configured to selectively control the refrigerant flow through the hot-end heat exchanger or the second indoor heat exchanger.

[0009] This application's multi-unit heat pump system, by combining a thermoacoustic engine with two refrigerant cycles, can improve the operating efficiency of the heat pump system and expand its application scenarios. Specifically, the thermoacoustic engine can utilize the thermoacoustic effect to transfer heat from the cold-end heat exchanger to the hot-end heat exchanger, and the cooling and heating generated during the operation of the thermoacoustic engine are used for the two refrigerant cycles respectively, achieving wide temperature range operation and improving the heat exchange effect and operating efficiency at low temperatures. Furthermore, since the heat transfer process of the thermoacoustic engine is less affected by the external ambient temperature, the multi-unit heat pump system of this application has a significant advantage in operating efficiency. By setting up a second indoor heat exchanger and a first valve section, and connecting the second indoor heat exchanger to the second refrigerant pipeline via a third refrigerant pipeline, the thermoacoustic engine can be bypassed, enabling the independent operation of the first and second indoor heat exchangers, thus expanding the system's application scenarios.

[0010] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the multi-unit heat pump system further includes a second outdoor heat exchange section and a fourth refrigerant pipeline. The second outdoor heat exchange section is disposed on the fourth refrigerant pipeline. The first end of the fourth refrigerant pipeline is connected to a second refrigerant pipeline between one end of the hot end heat exchanger and the second throttling element. The second end of the fourth refrigerant pipeline is connected to a second refrigerant pipeline between the other end of the hot end heat exchanger and the suction port of the second compressor.

[0011] The multi-unit heat pump system also includes a second valve section, which is configured to selectively control the flow of refrigerant through the second outdoor heat exchange section.

[0012] By setting up a second outdoor heat exchange unit and a fourth refrigerant pipeline, the first indoor heat exchanger can operate independently, expanding the application scenarios of the system.

[0013] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the multi-unit heat pump system further includes a third valve section, which is disposed in the fourth refrigerant pipeline and located between one end of the second outdoor heat exchange section and the second end of the fourth refrigerant pipeline.

[0014] The third valve section can control the flow direction of the refrigerant and improve system operating efficiency.

[0015] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the multi-unit heat pump system further includes a second outdoor heat exchange section, a third throttling element, and a fifth refrigerant pipeline. The second outdoor heat exchange section is disposed on the fifth refrigerant pipeline. The first end of the fifth refrigerant pipeline is connected to a second refrigerant pipeline between the exhaust port of the second compressor and one end of the first indoor heat exchanger. The second end of the fifth refrigerant pipeline is connected to a third refrigerant pipeline between the first end of the third refrigerant pipeline and one end of the second indoor heat exchanger. The third throttling element is disposed on the fifth refrigerant pipeline and located between the second outdoor heat exchange section and the second end of the fifth refrigerant pipeline.

[0016] By setting up a second outdoor heat exchange section, a third throttling element, and a fifth refrigerant pipeline, the second indoor heat exchanger can be operated independently, expanding the application scenarios of the system.

[0017] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the multi-unit heat pump system further includes a fourth valve section, which is configured to selectively control the flow of refrigerant through the second outdoor heat exchange section or the first indoor heat exchanger.

[0018] The fourth valve section can control the flow direction of the refrigerant and improve system operating efficiency.

[0019] In the preferred technical solution of the above-mentioned multi-connected heat pump system, the multi-connected heat pump system further includes a four-way valve, the four ports of which are respectively connected to the exhaust port of the second compressor, the connection point between the first end of the fifth refrigerant pipeline and the second refrigerant pipeline, the connection point between the second end of the third refrigerant pipeline and the second refrigerant pipeline, and the suction port of the second compressor.

[0020] By setting a four-way valve, the second indoor heat exchanger can operate in multiple modes, further expanding the application scenarios of the system.

[0021] In the preferred embodiment of the above-mentioned multi-unit heat pump system, at least one of the first outdoor heat exchange section and the second outdoor heat exchange section is an air-cooled heat exchanger; and / or

[0022] The first outdoor heat exchange section and the second outdoor heat exchange section are independent of each other or belong to different parts of the same heat exchanger.

[0023] By having the first outdoor heat exchange section and the second outdoor heat exchange section belong to the same heat exchanger, a high degree of integration and functional reuse of the heat exchanger can be achieved, thereby reducing the complexity of the system structure and improving the degree of system integration.

[0024] In the preferred technical solution of the above-mentioned multi-unit heat pump system, the first indoor heat exchanger is a hot water heat exchanger or a heating heat exchanger, and the second indoor heat exchanger is an air-cooled heat exchanger.

[0025] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the thermoacoustic engine includes two thermoacoustic units facing each other. Each thermoacoustic unit includes a compression section and a heat exchange section. Each heat exchange section includes a hot-end heat exchanger, a regenerator, and a cold-end heat exchanger. The exhaust port of the first compressor is connected to the first end of at least one cold-end heat exchanger. The first throttling element is connected to the second end of at least one cold-end heat exchanger. The intake port of the second compressor is connected to the first end of at least one hot-end heat exchanger. The second throttling element is connected to the second end of at least one hot-end heat exchanger.

[0026] By setting up two thermoacoustic units in a thermoacoustic machine, not only can the cooling and heating capacity be doubled, but also the problem of high vibration and noise caused by a single thermoacoustic unit can be overcome by placing the two thermoacoustic units opposite each other.

[0027] In the preferred embodiment of the aforementioned multi-unit heat pump system, the two thermoacoustic units are housed within the same casing, and the two heat exchange sections are interconnected or separated by a partition; and / or

[0028] The two cold-end heat exchangers are positioned opposite each other.

[0029] By placing two thermoacoustic units within the same housing and separating the heat exchange sections with a partition, the manufacturing process can be simplified, eliminating the need for specific design modifications to the housing's interior. Furthermore, the two heat exchange sections are interconnected, resulting in lower material costs, and the integrated design offers higher reliability and better heat exchange performance. Attached Figure Description

[0030] The present application will now be described with reference to the accompanying drawings. In the drawings:

[0031] Figure 1 This is a system diagram of a multi-unit heat pump system according to the first embodiment of this application;

[0032] Figure 2 This is a system diagram of a multi-unit heat pump system according to the second embodiment of this application;

[0033] Figure 3 A system diagram of the first operating mode of the multi-unit heat pump system according to the second embodiment of this application;

[0034] Figure 4 This is a system diagram illustrating the second operating mode of the multi-unit heat pump system according to the second embodiment of this application.

[0035] Figure 5 A system diagram illustrating the third operating mode of the multi-unit heat pump system according to the second embodiment of this application;

[0036] Figure 6 A system diagram illustrating the fourth operating mode of the multi-unit heat pump system according to the second embodiment of this application;

[0037] Figure 7 A system diagram of the fifth operating mode of the multi-unit heat pump system according to the second embodiment of this application;

[0038] Figure 8 This is a system diagram of a multi-unit heat pump system according to the third embodiment of this application;

[0039] Figure 9 This is a schematic diagram of the thermoacoustic generator of the multi-generation heat pump system according to the third embodiment of this application.

[0040] List of reference numerals

[0041] 1. Thermoacoustic unit; 11. Hot-end heat exchanger; 12. Cold-end heat exchanger; 13. Regenerator; 14. Shell; 15. Compression section; 16. Baffle; 21. First compressor; 22. Second compressor; 31. First outdoor heat exchange section; 32. Outdoor heat exchanger; 33. First indoor heat exchanger; 34. Second indoor heat exchanger; 41. First throttling element; 42. Second throttling element; 43. Third throttling element; 51. First fan; 52. Second fan; 61. First refrigerant line; 62. Second refrigerant line; 63. Third refrigerant line; 64. Fourth refrigerant line; 65. Fifth refrigerant line; 71. First valve section; 72. Second valve section; 73. Third valve section; 74. Fourth valve section; 8. Four-way valve. Detailed Implementation

[0042] Preferred embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of this application and are not intended to limit the scope of protection of this application.

[0043] It should be noted that in the description of this application, terms such as "upper," "lower," "left," and "right," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] First refer to Figure 1 This paper provides a brief introduction to the multi-unit heat pump system of this application.

[0046] like Figure 1 As shown, to address the low efficiency of existing multi-unit heat pump systems, the multi-unit heat pump system of this application includes a thermoacoustic unit 1, a first compressor 21, a first outdoor heat exchanger 31, a first throttling element 41, a second compressor 22, a first indoor heat exchanger 33, a second indoor heat exchanger 34, a second throttling element 42, and a first valve section 71. The thermoacoustic unit 1 has a cold-end heat exchanger 12 and a hot-end heat exchanger 11. The first compressor 21, the cold-end heat exchanger 12, the first throttling element 41, and the first outdoor heat exchanger 31 are circulated and connected through a first refrigerant pipeline 61. The second compressor 22, the first indoor heat exchanger 33, the second throttling element 42, and the hot end heat exchanger 11 are circulated and connected through the second refrigerant pipeline 62. The second indoor heat exchanger 34 is disposed on the third refrigerant pipeline 63. The first end of the third refrigerant pipeline 63 is connected to the second refrigerant pipeline 62 between the second throttling element 42 and one end of the hot end heat exchanger 11. The second end of the third refrigerant pipeline 63 is connected to the second refrigerant pipeline 62 between the other end of the hot end heat exchanger 11 and the suction port of the second compressor 22. The first valve 71 is configured to selectively control the refrigerant flow through the hot end heat exchanger 11 or the second indoor heat exchanger 34.

[0047] In one possible application scenario, the first indoor heat exchanger 33 is used to produce domestic hot water, and the second indoor heat exchanger 34 is used to exchange heat with indoor air. When only domestic hot water needs to be produced, the thermoacoustic motor 1, the first compressor 21, and the second compressor 22 are started and running. The first throttling element 41 and the second throttling element 42 are both opened to a certain degree, and the first valve 71 is adjusted to control the refrigerant flow through the hot-end heat exchanger 11. At this time, the thermoacoustic motor 1 uses the thermoacoustic effect to generate cooling and heating in the cold-end heat exchanger 12 and the hot-end heat exchanger 11, respectively. The high-temperature and high-pressure gaseous refrigerant discharged from the first compressor 21 enters the cold-end heat exchanger 12, absorbs the cooling energy of the cold-end heat exchanger 12, cools down, and forms a liquid. Then, the refrigerant passes through the first throttling element 41 to cool down and depressurize, becoming a low-temperature and low-pressure gas-liquid mixture refrigerant, which then enters the first outdoor heat exchange section 31 to exchange heat with the outdoor ambient air. After heat exchange, the refrigerant forms a gas and returns to the first compressor 21. The high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 enters the first indoor heat exchanger 33, where it exchanges heat with water to produce domestic hot water. After heat exchange, the refrigerant becomes liquid. The liquid refrigerant is cooled and depressurized by the second throttling element 42, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure gas-liquid mixture enters the hot-end heat exchanger 11, where it absorbs heat and vaporizes. The vaporized refrigerant then returns to the second compressor 22 for a second heating.

[0048] When hot water is needed for domestic use and indoor cooling is required, the first compressor 21 and the thermoacoustic motor 1 stop, the second compressor 22 starts, the first throttling element 41 opens to a certain degree, and the first valve 71 is adjusted to control the flow of refrigerant through the second indoor heat exchanger 34. At this time, the high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 enters the first indoor heat exchanger 33, where it exchanges heat with water to produce hot water. After heat exchange, the refrigerant becomes liquid. After passing through the second throttling element 42, the liquid refrigerant is cooled and depressurized, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure gas-liquid mixture enters the second indoor heat exchanger 34, where it exchanges heat with indoor air, lowering the indoor air temperature and achieving cooling. The refrigerant then heats up and vaporizes, returning to the second compressor 22.

[0049] As can be seen, the multi-unit heat pump system of this application, by combining the thermoacoustic engine 1 with two refrigerant cycles, can utilize the thermoacoustic engine 1 to improve the operating efficiency of the heat pump system and expand the application scenarios of the heat pump system. Specifically, the thermoacoustic engine 1 can use the thermoacoustic effect to transfer heat from the cold end heat exchanger 12 to the hot end heat exchanger 11, and the cooling and heating generated when the thermoacoustic engine 1 is working can be used for the two refrigerant cycles respectively, realizing large temperature span operation, improving the heat exchange effect of the two refrigerant cycles and the operating efficiency at low temperatures. Furthermore, since the heat transfer process of the thermoacoustic engine 1 is less affected by the external ambient temperature, the multi-unit heat pump system of this application has a significant advantage in operating efficiency. By setting up a second indoor heat exchanger 34 and a first valve section 71, and connecting the second indoor heat exchanger 34 to the second refrigerant pipeline 62 through the third refrigerant pipeline 63, the thermoacoustic engine 1 can be bypassed, and the first indoor heat exchanger 33 and the second indoor heat exchanger 34 can be operated independently, expanding the system's application scenarios.

[0050] The following is combined Figure 1 The first embodiment of the multi-unit heat pump system of this application is described in detail.

[0051] like Figure 1 As shown, in the first embodiment, the multi-generation heat pump system is a household dual-generation heat pump system, which includes a thermoelectric generator 1, a first compressor 21, a second compressor 22, a first outdoor heat exchanger 31, a first indoor heat exchanger 33, a second indoor heat exchanger 34, a first throttling element 41, a second throttling element 42, a first fan 51, a second fan 52, and a first valve 71.

[0052] The specific form of the thermoacoustic machine 1 is not limited in this application. It can be a free piston Stirling thermoacoustic machine or a resonant tube thermoacoustic machine. The resonant tube thermoacoustic machine can further include a traveling wave thermoacoustic machine, a standing wave thermoacoustic machine, or a traveling-standing wave thermoacoustic machine.

[0053] Whether it's a free-piston Stirling thermoacoustic engine or a resonant tube thermoacoustic engine, their basic principle is as follows: The thermoacoustic engine 1 contains a cavity for storing compressible gases such as helium or nitrogen, and it also has a special acoustic structure. A driving device (such as a linear compressor or linear motor) drives a piston to move at high speed and reciprocate, generating sound waves. When these sound waves propagate through the gas, a thermoacoustic effect is produced, causing gas molecules to undergo periodic compression and expansion. The special acoustic structure allows the sound waves to produce strong compression and expansion in specific regions. During the compression phase, collisions between gas molecules increase, converting kinetic energy into internal energy, leading to an increase in gas temperature. During the expansion phase, the gas does work, reducing internal energy and lowering temperature. The resonant tube or acoustic resonant cavity enhances the effect of the sound waves, and due to the reflection and superposition of sound waves, relatively stable compression and expansion regions are formed in specific areas, thus creating cold and hot ends within the cavity, respectively. Furthermore, by setting up a cold-end heat exchanger 12 and a hot-end heat exchanger 11 at the cold end and the hot end respectively, and setting up a regenerator 13 between the two heat exchangers, the heat and cold energy can be exported and utilized.

[0054] The first compressor 21, the cold-end heat exchanger 12, the first throttling element 41, and the first outdoor heat exchange section 31 are circulated and connected through the first refrigerant pipeline 61. Specifically, the exhaust port of the first compressor 21 is connected to one end of the cold-end heat exchanger 12. Figure 1 The lower end shown is connected, and the other end of the cold end heat exchanger 12 (shown below) is connected. Figure 1 The upper end shown) and one end of the first throttling element 41 ( Figure 1 The right end shown is connected, and the other end of the first throttling element 41 ( Figure 1 The left end shown) and one end of the first outdoor heat exchange section 31 (shown) Figure 1 The right end shown is connected to the other end of the first outdoor heat exchange section 31. Figure 1 The left end (shown) is connected to the air intake of the first compressor 21. The first outdoor heat exchange section 31 is an air-cooled heat exchanger, and a first fan 51 is provided corresponding to the first outdoor heat exchange section 31. When the first fan 51 starts, it drives outdoor air to flow through the first outdoor heat exchange section 31, exchanging heat with the refrigerant inside. The first throttling element 41 is preferably an electronic expansion valve.

[0055] The second compressor 22, the first indoor heat exchanger 33, the second throttling element 42, and the hot-end heat exchanger 11 are circulated together via the second refrigerant pipeline 62. Specifically, the exhaust port of the second compressor 22 is connected to one end of the first indoor heat exchanger 33. Figure 1 The right end shown is connected to the other end of the first indoor heat exchanger 33. Figure 1 The left end shown) and one end of the second throttling element 42 ( Figure 1 The right end shown is connected, and the other end of the second throttling element 42 ( Figure 1The left end shown) and one end of the hot end heat exchanger 11 (shown on the left) Figure 1 The lower end shown is connected, and the other end of the hot end heat exchanger 11 (shown below) is connected. Figure 1 The upper end (as shown) is connected to the suction port of the second compressor 22. The second throttling element 42 is preferably an electronic expansion valve. The first indoor heat exchanger 33 is a hot water heat exchanger, more specifically a coil heat exchanger, which is located inside the water heater or the domestic water tank.

[0056] The second indoor heat exchanger 34 is an air-cooled heat exchanger, which is installed on the third refrigerant pipe 63, at the first end of the third refrigerant pipe 63 ( Figure 1 The lower end shown is connected to the second throttling element 42 and one end of the hot-end heat exchanger 11. Figure 1 On the second refrigerant pipe 62 between the lower end shown), and the second end of the third refrigerant pipe 63 (shown at the lower end) Figure 1 The upper end shown is connected to the other end of the hot-end heat exchanger 11. Figure 1 The second refrigerant pipe 62 is located between the upper end of the second compressor 22 and the suction port of the second compressor 22. The second fan 52 is installed corresponding to the second indoor heat exchanger 34. When the second fan 52 is started, it drives the indoor air to flow through the second indoor heat exchanger 34 and exchange heat with the refrigerant flowing through the second indoor heat exchanger 34.

[0057] The first valve section 71 is a three-way control valve, and the first port of the three-way control valve ( Figure 1 Middle right interface), second interface ( Figure 1 (Middle and upper side interface) and third interface ( Figure 1 The left-side interface is connected to one port of the second throttling element 42, one end of the second indoor heat exchanger 34, and one end of the hot-end heat exchanger 11, respectively. The first interface of the three-way control valve can be selectively connected to the second or third interface to change the direction of refrigerant flow.

[0058] It should be noted that, although not explicitly stated in the above embodiments, those skilled in the art will understand that the types of refrigerant filled in the first refrigerant line 61 and the second refrigerant line 62 can be the same or different. For example, the first refrigerant line 61 can be filled with a refrigerant with a lower freezing point to adapt to lower outdoor ambient temperatures, while the second refrigerant line 62 can be filled with a refrigerant with a lower boiling point for better heat exchange.

[0059] The following is combined Figure 1 The working principle of the multi-generation heat pump system according to the first embodiment of this application is briefly introduced.

[0060] like Figure 1As shown, when only domestic hot water needs to be produced, the thermoacoustic unit 1, the first compressor 21, and the second compressor 22 start running. The first throttling element 41 and the second throttling element 42 each open to a certain degree. The first fan 51 starts running, the second fan 52 stops running, and the first valve section 71 switches to the first interface (…). Figure 1 The right-side interface and the third interface Figure 1 (Connected to the left-hand interface). The thermoacoustic unit 1 utilizes the thermoacoustic effect to generate cooling and heating in the cold-end heat exchanger 12 and the hot-end heat exchanger 11, respectively. The high-temperature, high-pressure gaseous refrigerant discharged from the first compressor 21 first passes through the cold-end heat exchanger 12, absorbing the cooling energy within it. After heat exchange, the refrigerant cools down and becomes liquid. The liquid refrigerant is then cooled and depressurized by the first throttling element 41, becoming a low-temperature, low-pressure gas-liquid mixture refrigerant. When this low-temperature, low-pressure gas-liquid mixture refrigerant flows through the first outdoor heat exchange section 31, it exchanges heat with the outdoor ambient air, absorbing heat from the outdoor ambient air and rising in temperature to form a gaseous state. The gaseous refrigerant then flows back to the first compressor 21. The high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 enters the first indoor heat exchanger 33, where it exchanges heat with the water in the water tank, thus raising the water temperature and preparing domestic hot water. After heat exchange, the refrigerant becomes liquid. After the liquid refrigerant passes through the second throttling element 42 to cool down and depressurize, it becomes a low-temperature, low-pressure gas-liquid mixture. The low-temperature, low-pressure gas-liquid mixture enters the hot-end heat exchanger 11, absorbs the heat from the hot-end heat exchanger 11, and the refrigerant temperature rises and vaporizes. The vaporized refrigerant returns to the second compressor 22 for a second heating.

[0061] When it is necessary to produce domestic hot water and cool the room simultaneously, the thermoacoustic machine 1 and the first compressor 21 stop, the second compressor 22 starts running, the second throttling element 42 opens to a certain degree, the first fan 51 stops, the second fan 52 starts, and the first valve section 71 switches to the first interface (…). Figure 1 The middle right interface) and the second interface ( Figure 1 The upper and middle interfaces are connected. The high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 enters the first indoor heat exchanger 33, where it exchanges heat with the water in the water tank, thus raising the water temperature and preparing domestic hot water. After heat exchange, the refrigerant becomes liquid. The liquid refrigerant passes through the second throttling element 42, where it is cooled and depressurized, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure gas-liquid mixture enters the second indoor heat exchanger 34, where it exchanges heat with the indoor airflow, thus lowering the air temperature and cooling the room. After heat exchange, the refrigerant's temperature rises and it vaporizes, returning to the second compressor 22 to continue the cycle.

[0062] The following is combined Figures 2 to 7 The second embodiment of the multi-unit heat pump system of this application is described below.

[0063] like Figure 2As shown, based on the first embodiment, this embodiment of the multi-unit heat pump system adds a second outdoor heat exchange section, a third throttling element 43, a four-way valve 8, a fourth refrigerant pipe 64, a fifth refrigerant pipe 65, a second valve section 72, a third valve section 73, and a fourth valve section 74. Specifically, the second outdoor heat exchange section is also an air-cooled heat exchanger, and the first outdoor heat exchange section 31 and the second outdoor heat exchange section belong to the same outdoor heat exchanger 32. The arrangement of the two is not limited in this application. For example, they can be arranged side by side along the airflow direction, or side by side or top and bottom, etc., and their internal flow paths are independent of each other and do not affect each other. The second outdoor heat exchange section is set on the fourth refrigerant pipe 64, and the first end of the fourth refrigerant pipe 64 ( Figure 2 The lower end shown is connected to one end of the hot-end heat exchanger 11. Figure 2 On the second refrigerant line 62 between the lower end shown and the second throttling element 42, the second end of the fourth refrigerant line 64 (shown below) Figure 2 The upper end shown is connected to the other end of the hot-end heat exchanger 11. Figure 2 The first fan 51 can act on the first outdoor heat exchange section 31 and the second outdoor heat exchange section simultaneously. In other words, when the first fan 51 is started, it can drive the outdoor ambient air to flow through the first outdoor heat exchange section 31 and the second outdoor heat exchange section simultaneously or sequentially.

[0064] The second valve section 72 is a three-way control valve, and the first port of the three-way control valve ( Figure 2 Middle right interface), second interface ( Figure 2 (Middle and upper side interface) and third interface ( Figure 2 The left-side interface is connected to one end of the second throttling element 42, one end of the hot-end heat exchanger 11, and one end of the second outdoor heat exchange section, respectively. The first interface of the three-way control valve can be selectively connected to the second or third interface to change the flow direction of the refrigerant. In this embodiment, the first interface of the second valve section 72 is connected to the third interface of the first valve section 71. The third valve section 73 is a solenoid valve, which is installed on the fourth refrigerant line 64 and located between one end of the second outdoor heat exchange section and the second end of the fourth refrigerant line 64.

[0065] The fifth refrigerant line 65 shares a portion of the piping with the fourth refrigerant line 64, and the second outdoor heat exchange unit is located on this shared piping. The first end of the fifth refrigerant line 65 ( Figure 2 The lower end (shown) is connected to the exhaust port of the second compressor 22 and one end of the first indoor heat exchanger 33. Figure 2 On the second refrigerant pipe 62 between the right end shown, and the second end of the fifth refrigerant pipe 65 (shown on the right end), Figure 2 The upper end shown is connected to the first end of the third refrigerant pipe 63. Figure 2One end of the first valve section 71 is connected to the second interface, and one end of the second indoor heat exchanger 34 is connected to the second interface. Figure 2 The third refrigerant pipe 63 is located between the second outdoor heat exchange section and the second end of the fifth refrigerant pipe 65. The third throttling element 43 is installed on the fifth refrigerant pipe 65 and is located at the second end of the fifth refrigerant pipe 65. Figure 2 Between the upper end shown. The third throttling element 43 is preferably an electronic expansion valve.

[0066] The fourth valve section 74 is a three-way control valve, and the first port of the three-way control valve ( Figure 2 Upper and middle interfaces), second interface ( Figure 2 (middle left interface) and third interface ( Figure 2 The lower interface is connected to one interface of the four-way valve 8, one end of the first indoor heat exchanger 33, and the first end of the fifth refrigerant line 65, respectively. The first interface of the three-way control valve can be selectively connected to the second or third interface to change the direction of refrigerant flow.

[0067] The four ports of the four-way valve 8 are respectively connected to the exhaust port of the second compressor 22, the connection point between the first end of the fifth refrigerant line 65 and the second refrigerant line 62, the connection point between the second end of the third refrigerant line 63 and the second refrigerant line 62, and the suction port of the second compressor 22. In this embodiment, the connection point between the first end of the fifth refrigerant line 65 and the second refrigerant line 62 is actually one port of the four-way valve 8 connected to the first port of the fourth valve section 74.

[0068] The following is combined Figures 3 to 7 The working principle of the second embodiment of the multi-unit heat pump system of this application is introduced.

[0069] First refer to Figure 3 When hot water is needed for domestic use and indoor cooling is required, the thermoacoustic unit 1 and the first compressor 21 stop, the second compressor 22 starts running, the second throttling element 42 opens to a certain degree, the third throttling element 43 closes, the first fan 51 stops, the second fan 52 starts, and the first valve 71 switches to the first interface (…). Figure 3 The middle right interface) and the second interface ( Figure 3 The upper and middle interfaces are connected, the third valve 73 is closed, and the first interface of the fourth valve 74 is closed. Figure 4 (Upper interface) and the second interface ( Figure 4(Left side interface). The high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 enters the first indoor heat exchanger 33, where it exchanges heat with the water in the water tank, thus raising the water temperature and preparing domestic hot water. After heat exchange, the refrigerant becomes liquid. The liquid refrigerant passes through the second throttling element 42, where it is cooled and depressurized, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure gas-liquid mixture enters the second indoor heat exchanger 34, where it exchanges heat with the indoor airflow, thus lowering the air temperature and cooling the room. After heat exchange, the refrigerant's temperature rises and it vaporizes, returning to the second compressor 22 to continue the cycle.

[0070] Next, refer to Figure 4 When the outdoor ambient temperature is low and there is a demand for producing domestic hot water, the thermoacoustic unit 1, the first compressor 21, the second compressor 22, and the first fan 51 start running, the second fan 52 stops, the first throttling element 41 and the second throttling element 42 each open to a certain degree, the third throttling element 43 closes, and the first port of the first valve section 71 ( Figure 4 Right side interface) and third interface ( Figure 4 The left-side interface is connected, and the first interface of the second valve section 72 is connected. Figure 4 Right side interface) and second interface ( Figure 4 The upper interface is connected, the third valve 73 is closed, and the first interface of the fourth valve 74 is closed. Figure 4 (Upper interface) and the second interface ( Figure 4 (Left interface) Connected. During the operation of the thermoacoustic machine 1, heat and cold are generated through the thermoacoustic effect, and the heat and cold are absorbed by the hot-end heat exchanger 11 and the cold-end heat exchanger 12, respectively. The high-temperature and high-pressure gaseous refrigerant discharged from the first compressor 21 first passes through the cold-end heat exchanger 12, where it exchanges heat with the cold energy inside the cold-end heat exchanger 12. After heat exchange, the refrigerant cools down and depressurizes, becoming liquid. The liquid refrigerant then passes through the first throttling element 41, where it cools down and depressurizes, becoming a low-temperature and low-pressure gas-liquid mixture. When the low-temperature and low-pressure gas-liquid mixture flows through the first outdoor heat exchange section 31, it exchanges heat with the outdoor ambient air, absorbing heat from the outdoor ambient air and rising in temperature to form a gaseous state. The gaseous refrigerant then flows back to the first compressor 21. The high-temperature and high-pressure gaseous refrigerant discharged from the second compressor 22 first passes through the first indoor heat exchanger 33, where it exchanges heat with the water in the water tank. As a result, the temperature of the water in the water tank rises, thus achieving the production of hot water. After heat exchange, the refrigerant cools down to a liquid state. The liquid refrigerant flows through the second throttling element 42 and cools down and depressurizes to become a low-temperature, low-pressure gas-liquid mixture. When the low-temperature, low-pressure refrigerant passes through the hot-end heat exchanger 11, it absorbs heat from the hot-end heat exchanger 11 and heats up to vaporize. The vaporized refrigerant returns to the second compressor 22 to continue the cycle.

[0071] Next, refer to Figure 5When the outdoor ambient temperature is high and there is a demand for producing domestic hot water, the thermoacoustic unit 1, the first compressor 21, and the second fan 52 stop, the second compressor 22 and the first fan 51 start running, the second throttling element 42 opens to a certain degree, the third throttling element 43 closes, and the first port of the first valve section 71 ( Figure 5 Right side interface) and third interface ( Figure 5 The left-side interface is connected, and the first interface of the second valve section 72 is connected. Figure 5 Right side interface) and third interface ( Figure 5 The left interface is connected, the third valve 73 is opened, and the first interface of the fourth valve 74 is open. Figure 5 (Upper interface) and the second interface ( Figure 5 (Left interface) Connected. The high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 first passes through the first indoor heat exchanger 33, where it exchanges heat with the water in the water tank. As a result, the water temperature in the tank rises, thus producing hot water. After heat exchange, the refrigerant cools down to a liquid state. The liquid refrigerant flows through the second throttling element 42, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. When the low-temperature, low-pressure refrigerant passes through the second outdoor heat exchange section, it exchanges heat with the ambient air, absorbing heat from the ambient air and vaporizing. The vaporized refrigerant returns to the second compressor 22 to continue the cycle.

[0072] Next, refer to Figure 6 When only indoor cooling is needed, the thermoacoustic unit 1 and the first compressor 21 stop, the second compressor 22, the first fan 51 and the second fan 52 start running, the third throttling element 43 opens to a certain degree, and the first interface of the second valve section 72 ( Figure 6 Right side interface) and second interface ( Figure 6 The upper interface is connected, the third valve 73 is closed, and the first interface of the fourth valve 74 is closed. Figure 6 (Upper interface) and the third interface ( Figure 6 (Lower interface) connected. The high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 first passes through the second outdoor heat exchange section, where it exchanges heat with the ambient air. The refrigerant absorbs the cold air from the ambient air, causing its temperature to drop. After heat exchange, the refrigerant cools down to a liquid state. The liquid refrigerant flows through the third throttling element 43, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. When the low-temperature, low-pressure refrigerant passes through the second indoor heat exchanger 34, it exchanges heat with the indoor air, absorbing heat from the indoor air and vaporizing. As a result, the indoor air temperature decreases, achieving cooling of the room. The vaporized refrigerant returns to the second compressor 22 to continue the cycle.

[0073] Finally refer to Figure 7When only indoor heating is needed, the four-way valve 8 reverses, the thermoacoustic machine 1 and the first compressor 21 stop, the second compressor 22, the first fan 51 and the second fan 52 start running, the third throttling element 43 opens to a certain degree, and the first port of the first valve section 71 ( Figure 7 Right side interface) and third interface ( Figure 7 The left-side interface is connected, and the first interface of the second valve section 72 is connected. Figure 7 Right side interface) and second interface ( Figure 7 The upper interface is connected, the third valve 73 is closed, and the first interface of the fourth valve 74 is closed. Figure 7 (Upper interface) and the third interface ( Figure 7 (Lower interface) connected. The high-temperature, high-pressure gaseous refrigerant discharged from the second compressor 22 first passes through the second indoor heat exchanger 34, where it exchanges heat with the indoor air, absorbing the cold air and thus lowering its temperature, thereby raising the indoor air temperature and achieving heating. After heat exchange, the refrigerant cools down to a liquid state. The liquid refrigerant flows through the third throttling element 43, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. When the low-temperature, low-pressure refrigerant passes through the second outdoor heat exchange section, it exchanges heat with the ambient air, absorbing heat from the ambient air and vaporizing. The vaporized refrigerant returns to the second compressor 22 to continue the cycle.

[0074] The above configuration, by including a second outdoor heat exchanger and a fourth refrigerant pipeline 64, allows the first indoor heat exchanger 33 to operate independently, expanding the system's application scenarios. The third valve 73 controls the refrigerant flow direction, improving system operating efficiency. Similarly, by including a second outdoor heat exchanger, a third throttling element 43, and a fifth refrigerant pipeline 65, the second indoor heat exchanger 34 can operate independently, expanding the system's application scenarios. The fourth valve 74 also controls the refrigerant flow direction, improving system operating efficiency. Since the first and second outdoor heat exchangers belong to the same heat exchanger, high integration and functional reuse of the heat exchangers are achieved, reducing system structural complexity and increasing system integration. The four-way valve 8 allows the second indoor heat exchanger 34 to operate in multiple modes, further expanding the system's application scenarios.

[0075] Next, refer to Figure 8 and Figure 9 The third embodiment of the multi-unit heat pump system of this application will be briefly introduced.

[0076] like Figure 8 and Figure 9As shown, based on the first embodiment, this embodiment adjusts the structure of the thermoacoustic machine 1. Specifically, the thermoacoustic machine 1 includes two thermoacoustic units facing each other, which are disposed within the same housing 14, and each thermoacoustic unit includes a compression section 15 and a heat exchange section. The compression section 15 is a linear compressor, which includes electromagnetic components, a power piston, a spring, an exhaust fan, etc. The heat exchange section includes a hot-end heat exchanger 11, a regenerator 13, and a cold-end heat exchanger 12. An expansion chamber and a compression chamber are formed within the housing 14. The cold-end heat exchanger 12 is located in the expansion chamber, the hot-end heat exchanger 11 is located in the compression chamber, and the regenerator 13 is located between the cold-end heat exchanger 12 and the hot-end heat exchanger 11. Further, as... Figure 9 As shown, in this application, the two cold-end heat exchangers 12 are positioned opposite each other (i.e., the two cold-end heat exchangers 12 are close to each other and face each other), and a partition 16 is provided between the two cold-end heat exchangers 12 to separate the two thermoacoustic units. (Return to Reference) Figure 8 The discharge port of the first compressor 21 is connected to the first end of at least one cold-end heat exchanger 12, and the first throttling element 41 is connected to the second end of at least one cold-end heat exchanger 12. The suction port of the second compressor 22 is connected to the first end of at least one hot-end heat exchanger 11, and the second throttling element 42 is connected to the second end of at least one hot-end heat exchanger 11. Specifically, the discharge port of the first compressor 21 is simultaneously connected to the first ends of two cold-end heat exchangers 12. Figure 8 The lower end shown is connected, and one end of the first throttling element 41 is simultaneously connected to the second end of the two cold end heat exchangers 12. Figure 8 The upper end of the two cold-end heat exchangers 12 is connected, forming a structure similar to a "parallel" connection in electrical circuitry. The suction port of the second compressor 22 is simultaneously connected to the first end of each of the two hot-end heat exchangers 11. Figure 8 The lower end shown is connected, and one end of the second throttling element 42 is simultaneously connected to the second end of the two hot-end heat exchangers 11. Figure 8 The upper end is connected, and at this time the two hot end heat exchangers 11 also form a "parallel" structure similar to that in electricity.

[0077] Thus, by setting two thermoacoustic units in the thermoacoustic unit 1, not only can the cooling and heating capacity be doubled, but the problem of high vibration and noise caused by a single thermoacoustic unit can also be overcome by placing the two thermoacoustic units opposite each other. Placing the two thermoacoustic units within the same housing 14 and separating the heat exchange sections by a partition 16 simplifies the manufacturing process, eliminating the need for specific design of the interior of the housing 14. The working principle of the above embodiment can be referred to the first embodiment, and will not be repeated here.

[0078] It should be noted that the above preferred embodiments are merely illustrative of the principles of this application and are not intended to limit the scope of protection of this application. Without departing from the principles of this application, those skilled in the art can adjust the above settings to make this application applicable to more specific application scenarios.

[0079] For example, in an alternative embodiment, although the above embodiment is described with the first outdoor heat exchanger 31, the second outdoor heat exchanger, and the second indoor heat exchanger 34 all being air-cooled heat exchangers, the specific form of the heat exchangers is not unique, and those skilled in the art can adjust them. For example, at least one of the heat exchange components can also be replaced with a liquid-cooled heat exchanger, which has a liquid-cooled inlet and a liquid-cooled outlet, and is configured to circulate with a liquid-cooling source through the liquid-cooled inlet and outlet. For example, the liquid-cooled heat exchanger can exchange heat with groundwater or cooling water in a cold water tank. Moreover, when the heat exchanger is a liquid-cooled heat exchanger, the corresponding fan can be omitted.

[0080] For example, in another alternative embodiment, the arrangement of the first outdoor heat exchange unit 31 and the second outdoor heat exchange unit belonging to the same heat exchanger in the second embodiment is only a preferred option. In other embodiments, those skilled in the art can also separate and set them independently, for example, setting two outdoor heat exchange units, each of which operates independently and is equipped with a fan or water-cooling components, etc. This replacement of the arrangement does not deviate from the principle of this application.

[0081] For example, in another alternative embodiment, although the first indoor heat exchanger 33 is described in conjunction with the production of domestic hot water, the specific function of the first indoor heat exchanger 33 is not fixed. Those skilled in the art can make selections based on specific scenarios. For example, the first indoor heat exchanger 33 can also be used for heating, such as the first indoor heat exchanger 33 being a plate heat exchanger or a shell-and-tube heat exchanger, or the first indoor heat exchanger 33 being a coil heat exchanger, which is installed in a heating water tank.

[0082] For example, in another alternative implementation, the above implementation is introduced as an example of changing the refrigerant flow direction by setting a three-way control valve. However, this setting method is only exemplary. In other implementations, the three-way control valve can be replaced with two on / off valves (such as solenoid valves) to achieve the same adjustment of the flow direction.

[0083] For example, in another alternative embodiment, the second embodiment described above is illustrated by simultaneously providing both the fourth and fifth refrigerant lines 65. However, this is merely a preferred embodiment, and those skilled in the art can also provide only one of them, thereby making this application applicable to more specific application scenarios. Correspondingly, when only the fourth refrigerant line 64 is provided, the third valve section 73 may not be provided. When only the fifth refrigerant line 65 is provided, the fourth valve section 74 may also not be provided.

[0084] For example, in another alternative embodiment, although the second embodiment described above is illustrated with an example of having a four-way valve 8, this is merely a preferred embodiment. With the four-way valve 8 provided, simple switching between different modes can be achieved. Of course, those skilled in the art can omit the four-way valve 8.

[0085] For example, in another alternative embodiment, although the third embodiment described above is based on the example of two thermoacoustic units being arranged in the same housing 14, this is only a preferred embodiment. In other embodiments, two separate thermoacoustic units 1 can also be arranged opposite each other.

[0086] For example, in another alternative embodiment, although the heat exchange sections of the two thermoacoustic units in the third embodiment above are separated by a partition 16, this is only one possible way. In another embodiment, the two heat exchange sections can also be connected to each other. In this case, the two cold end heat exchangers 12 are located in the same expansion chamber. In this way, the two heat exchange sections are connected to each other, the material cost is low, and the integrated design has higher reliability and better heat exchange effect.

[0087] For example, in another alternative implementation, although the third implementation described above is based on the example of two cold-end heat exchangers 12 facing each other, this is only one possible implementation. The specific arrangement depends on the specific form of the heat exchange unit. For example, when the hot-end heat exchanger 11 is located at the outermost edge of the thermoacoustic unit, the two hot-end heat exchangers 11 can also be arranged to face each other.

[0088] For example, in another alternative embodiment, the specific form of the compression unit 15 is not limited in this application. In addition to a linear compressor, it can be any other type of compressor, such as a crank-connecting rod compressor.

[0089] For example, in another alternative embodiment, although the third embodiment described above is illustrated by setting both the two cold-end heat exchangers 12 and the two hot-end heat exchangers 11 in parallel, this is only used to illustrate the principle of this application and is not intended to limit the scope of protection of this application. Those skilled in the art will understand that in other embodiments, the connection method of the two cold-end heat exchangers 12 and the two hot-end heat exchangers 11 can also be changed so that this application can be applied to more specific application scenarios. For example, the two cold-end heat exchangers 12 and the two hot-end heat exchangers 11 are respectively connected in series, that is, the refrigerant discharged from the first compressor 21 passes through the two cold-end heat exchangers 12 before entering the first throttling element 41 for throttling and pressure reduction, and the refrigerant after the second throttling element 42 passes through the two hot-end heat exchangers 11 before returning to the second compressor 22.

[0090] For example, in another alternative embodiment, although the above embodiments are described in conjunction with a residential dual-heat pump system, this is not intended to limit the scope of protection of this application. Those skilled in the art can apply this application to other application scenarios without departing from the principles of this application. For example, the heat pump system of this application is also applicable to commercial heat pump applications. Furthermore, the heat pump system of this application is also applicable to a triple-heat pump system; for example, a heating heat exchanger can be added to the second refrigerant pipe 62 to form a triple-heat pump system together with the hot water heat exchanger and the air-cooled heat exchanger.

[0091] Of course, the alternative implementation methods described above, as well as the alternative implementation methods and preferred implementation methods, can be used in combination to create new implementation methods suitable for more specific application scenarios. For example, the thermoacoustic machine 1 in the third implementation method can also be applied to the second implementation method.

[0092] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0093] The technical solutions of this application have been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A multi-generation heat pump system, characterized in that, include: A thermoacoustic machine having a cold-end heat exchanger and a hot-end heat exchanger; The first compressor, the first outdoor heat exchange unit, and the first throttling element are connected in a circulating manner through a first refrigerant pipeline. The system comprises a second compressor, a first indoor heat exchanger, a second indoor heat exchanger, a second throttling element, and a first valve. The second compressor, the first indoor heat exchanger, the second throttling element, and the hot-end heat exchanger are circulated and connected via a second refrigerant pipeline. The second indoor heat exchanger is located on a third refrigerant pipeline. The first end of the third refrigerant pipeline is connected to a second refrigerant pipeline between the second throttling element and one end of the hot-end heat exchanger. The second end of the third refrigerant pipeline is connected to a second refrigerant pipeline between the other end of the hot-end heat exchanger and the suction port of the second compressor. The first valve is configured to selectively control the refrigerant flow through the hot-end heat exchanger or the second indoor heat exchanger.

2. The multi-circuit heat pump system according to claim 1, characterized in that, The multi-generation heat pump system further includes a second outdoor heat exchange section and a fourth refrigerant pipeline. The second outdoor heat exchange section is disposed on the fourth refrigerant pipeline. The first end of the fourth refrigerant pipeline is connected to the second refrigerant pipeline between one end of the hot end heat exchanger and the second throttling element. The second end of the fourth refrigerant pipeline is connected to the second refrigerant pipeline between the other end of the hot end heat exchanger and the suction port of the second compressor. The multi-unit heat pump system also includes a second valve section, which is configured to selectively control the flow of refrigerant through the second outdoor heat exchange section.

3. The multi-circuit heat pump system according to claim 2, characterized in that, The multi-unit heat pump system also includes a third valve section, which is disposed in the fourth refrigerant pipeline and located between one end of the second outdoor heat exchange section and the second end of the fourth refrigerant pipeline.

4. The multi-unit heat pump system according to claim 1, characterized in that, The multi-generation heat pump system further includes a second outdoor heat exchange section, a third throttling element, and a fifth refrigerant pipeline. The second outdoor heat exchange section is disposed on the fifth refrigerant pipeline. The first end of the fifth refrigerant pipeline is connected to a second refrigerant pipeline between the exhaust port of the second compressor and one end of the first indoor heat exchanger. The second end of the fifth refrigerant pipeline is connected to a third refrigerant pipeline between the first end of the third refrigerant pipeline and one end of the second indoor heat exchanger. The third throttling element is disposed on the fifth refrigerant pipeline and located between the second outdoor heat exchange section and the second end of the fifth refrigerant pipeline.

5. The multi-unit heat pump system according to claim 4, characterized in that, The multi-unit heat pump system also includes a fourth valve section, which is configured to selectively control the flow of refrigerant through the second outdoor heat exchange section or the first indoor heat exchanger.

6. The multi-unit heat pump system according to claim 4, characterized in that, The multi-connector heat pump system also includes a four-way valve, the four ports of which are respectively connected to the exhaust port of the second compressor, the connection point between the first end of the fifth refrigerant pipeline and the second refrigerant pipeline, the connection point between the second end of the third refrigerant pipeline and the second refrigerant pipeline, and the suction port of the second compressor.

7. The multi-unit heat pump system according to claim 2 or 4, characterized in that, At least one of the first outdoor heat exchange section and the second outdoor heat exchange section is an air-cooled heat exchanger; and / or The first outdoor heat exchange section and the second outdoor heat exchange section are independent of each other or belong to different parts of the same heat exchanger.

8. The multi-unit heat pump system according to claim 1, characterized in that, The first indoor heat exchanger is a hot water heat exchanger or a heating heat exchanger, and the second indoor heat exchanger is an air-cooled heat exchanger.

9. The multi-unit heat pump system according to claim 1, characterized in that, The thermoacoustic engine includes two thermoacoustic units facing each other. Each thermoacoustic unit includes a compression section and a heat exchange section. Each heat exchange section includes a hot-end heat exchanger, a regenerator, and a cold-end heat exchanger. The exhaust port of the first compressor is connected to a first end of at least one cold-end heat exchanger. The first throttling element is connected to a second end of at least one cold-end heat exchanger. The intake port of the second compressor is connected to a first end of at least one hot-end heat exchanger. The second throttling element is connected to a second end of at least one hot-end heat exchanger.

10. The multi-unit heat pump system according to claim 9, characterized in that, The two thermoacoustic units are disposed within the same housing, and the two heat exchange sections are either interconnected or separated by a partition; and / or The two cold-end heat exchangers are positioned opposite each other.

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