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, comprising a cold-end heat exchanger, a first hot-end heat exchanger, and a second hot-end heat exchanger; a first outdoor heat exchange section for heat exchange with the cold-end heat exchanger; a compressor connected to the first hot-end heat exchanger via a first refrigerant pipeline; a first indoor heat exchanger located on the first refrigerant pipeline; a first throttling element located on the first refrigerant pipeline and between the compressor exhaust port and the first indoor heat exchanger; a second indoor heat exchanger connected to the second hot-end heat exchanger via a second refrigerant pipeline; and a second throttling element located on the second refrigerant pipeline and between the second indoor heat exchanger and the second hot-end heat exchanger. This application can achieve a larger temperature span operation of the system and improve the system's operating efficiency.

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, comprising a cold-end heat exchanger, a first hot-end heat exchanger, and a second hot-end heat exchanger.

[0007] The first outdoor heat exchange section exchanges heat with the cold end heat exchanger through a first refrigerant.

[0008] The compressor is connected to the first hot-end heat exchanger via a first refrigerant pipeline.

[0009] The first indoor heat exchanger is disposed in the first refrigerant pipeline and located between the exhaust port of the compressor and one end of the first hot end heat exchanger.

[0010] The first throttling element is disposed in the first refrigerant pipeline and located between the compressor's exhaust port and the first indoor heat exchanger;

[0011] The second indoor heat exchanger is connected to the second hot end heat exchanger via a second refrigerant pipeline, and the two ends of the second refrigerant pipeline are respectively connected to the suction port and the exhaust port of the compressor.

[0012] The second throttling element is disposed in the second refrigerant pipeline and located between one end of the second indoor heat exchanger and one end of the second hot end heat exchanger.

[0013] The multi-unit heat pump system of this application, by combining a thermoacoustic engine with a traditional vapor compression cycle, can achieve a wider temperature range and improve the system's operating efficiency. Specifically, by setting a first hot-end heat exchanger and a second hot-end heat exchanger in the thermoacoustic engine, and by having the first indoor heat exchanger exchange heat with the first hot-end heat exchanger and the second indoor heat exchanger exchange heat with the second hot-end heat exchanger, heat can be provided to the first and second indoor heat exchangers in low-temperature environments through the cascading of the thermoacoustic engine and the compressor, thereby improving the system's operating capacity. Furthermore, since the heat transfer process during the operation of the thermoacoustic engine is less affected by the ambient temperature, the dual-unit heat pump system of this application has a significant advantage in operating efficiency compared to traditional heat pumps.

[0014] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the first outdoor heat exchange section is circulatedly connected to the cold-end heat exchanger through a first refrigerant pipeline. The multi-unit heat pump system further includes a first pump body, which is disposed in the first refrigerant pipeline, and a first refrigerant is filled in the first refrigerant pipeline; or

[0015] The first outdoor heat exchange section is a heat pipe heat exchanger, wherein the condensing end of the heat pipe heat exchanger exchanges heat with the cold end heat exchanger, and a first refrigerant is filled in the heat pipe heat exchanger; or

[0016] The first outdoor heat exchange section and the cold end heat exchanger are connected by a pipeline to form a loop heat pipe, and the first refrigerant is filled in the loop heat pipe.

[0017] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the other end of the second indoor heat exchanger is connected to the exhaust port of the compressor, and the other end of the second hot-end heat exchanger is connected to the suction port of the compressor; or

[0018] The other end of the second indoor heat exchanger is connected to the air intake of the compressor, and the other end of the second hot end heat exchanger is connected to the exhaust port of the compressor.

[0019] 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 third refrigerant pipeline. The second outdoor heat exchange section is disposed on the third refrigerant pipeline. The first end of the third refrigerant pipeline is connected to a first refrigerant pipeline between one end of the first hot end heat exchanger and the first throttling element. The second end of the third refrigerant pipeline is connected to a first refrigerant pipeline between the other end of the first hot end heat exchanger and the suction port of the compressor.

[0020] The multi-unit heat pump system further includes a first valve body or a first valve group, which is configured to selectively control the flow of refrigerant through the first hot-end heat exchanger or the second outdoor heat exchange section.

[0021] By setting up a second outdoor heat exchange unit, the first indoor heat exchanger can operate independently without turning on the thermoacoustic machine, thereby improving the system's applicability to different scenarios and ensuring product operating efficiency.

[0022] In the preferred technical solution of the above-mentioned multi-unit heat pump system, the multi-unit heat pump system further includes a third outdoor heat exchange section and a fourth refrigerant pipeline. The third 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 second 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 second hot end heat exchanger and the suction port or exhaust port of the compressor.

[0023] The multi-unit heat pump system further includes a second valve body or a second valve group, which is configured to selectively control the flow of refrigerant through the second hot-end heat exchanger or the third outdoor heat exchange section.

[0024] By setting up a third outdoor heat exchange unit, the second indoor heat exchanger can operate independently without turning on the thermoacoustic machine, thereby improving the system's applicability to different scenarios and ensuring product operating efficiency.

[0025] In the preferred embodiment of the above-mentioned multi-unit heat pump system, the multi-unit heat pump system further includes a first fan, and at least one of the first outdoor heat exchange section, the second outdoor heat exchange section, and the third outdoor heat exchange section is an air-cooled heat exchanger; and / or

[0026] The first outdoor heat exchange section, the second outdoor heat exchange section, and the third outdoor heat exchange section are independent of each other or belong to different parts of the same heat exchanger;

[0027] The third outdoor heat exchange unit is located at the upstream end of the airflow direction.

[0028] By having the first, second, and third outdoor heat exchange sections belong to the same heat exchanger, a high degree of integration and functional reuse of the heat exchanger can be achieved, thereby reducing system structural complexity and improving system integration. By placing the third outdoor heat exchange section at the upstream end of the airflow direction, the heat exchange efficiency of the first and second outdoor heat exchange sections can be improved, thus enhancing system efficiency.

[0029] 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 compressor, the branch end of the second refrigerant pipeline and the first refrigerant pipeline, the confluence end of the second refrigerant pipeline and the first refrigerant pipeline, and the suction port of the compressor.

[0030] By setting a four-way valve, the system can operate in multiple modes, further expanding the system's application scenarios.

[0031] In the preferred embodiment 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, the second indoor heat exchanger is an air-cooled heat exchanger, and the multi-unit heat pump system further includes a second fan, which is configured corresponding to the second indoor heat exchanger; or

[0032] One of the first indoor heat exchanger and the second indoor heat exchanger is a heating heat exchanger, and the other is a hot water heat exchanger.

[0033] 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 first hot-end heat exchanger, a second hot-end heat exchanger, a regenerator, and a cold-end heat exchanger. The first outdoor heat exchange section exchanges heat with the two cold-end heat exchangers through a first refrigerant. The suction port of the compressor is connected to one end of at least one of the first hot-end heat exchangers. The first throttling element is connected to both ends of at least one of the first hot-end heat exchangers. One end of the second refrigerant pipeline is connected to one end of at least one of the second hot-end heat exchangers. The second throttling element is connected to both ends of at least one of the second hot-end heat exchangers.

[0034] 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.

[0035] 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

[0036] The two cold-end heat exchangers are positioned opposite each other.

[0037] 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

[0038] The present application will now be described with reference to the accompanying drawings. In the drawings:

[0039] Figure 1 This is a system diagram of a multi-unit heat pump system according to the first embodiment of this application;

[0040] Figure 2 This is a system diagram of a multi-unit heat pump system according to the second embodiment of this application;

[0041] Figure 3 This is a system diagram of the first operating mode of the multi-unit heat pump system in the second embodiment of this application;

[0042] Figure 4 This is a system diagram of the second operating mode of the multi-unit heat pump system in the second embodiment of this application;

[0043] Figure 5 This is a system diagram of the third operating mode of the multi-unit heat pump system in the second embodiment of this application;

[0044] Figure 6 This is a system diagram of the fourth operating mode of the multi-unit heat pump system in the second embodiment of this application;

[0045] Figure 7 This is a system diagram of a multi-unit heat pump system according to the third embodiment of this application;

[0046] Figure 8 This is a schematic diagram of the thermoacoustic engine of the multi-generation heat pump system in the third embodiment of this application.

[0047] List of reference numerals

[0048] 1. Thermoacoustic unit; 11. First hot-end heat exchanger; 12. Second hot-end heat exchanger; 13. Cold-end heat exchanger; 14. Regenerator; 15. Shell; 16. Compressor section; 17. Baffle plate; 21. First outdoor heat exchange section; 22. Second outdoor heat exchange section; 23. Third outdoor heat exchange section; 24. First indoor heat exchanger; 25. Second indoor heat exchanger; 31. First valve body; 32. First valve section; 33. Second valve body; 34. Second valve section; 41. First fan; 42. Second fan; 51. First cooling pipeline; 52. First refrigerant pipeline; 53. Second refrigerant pipeline; 54. Third refrigerant pipeline; 55. Fourth refrigerant pipeline; 61. First pump body; 7. Compressor; 8. Four-way valve; 91. First throttling element; 92. Second throttling element. Detailed Implementation

[0049] 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.

[0050] It should be noted that in the description of this application, terms such as "upper," "lower," "left," and "right," indicating directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are 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," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in the description of this application, "multi-source power supply" refers to at least two-source power supplies, but can also be three-source power supplies.

[0051] 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.

[0052] First refer to Figure 1 This paper provides a brief introduction to the multi-unit heat pump system of this application.

[0053] 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 outdoor heat exchanger 21, a compressor 7, a first indoor heat exchanger 24, a first throttling element 91, a second indoor heat exchanger 25, and a second throttling element 92. The thermoacoustic unit 1 includes a cold-end heat exchanger 13, a first hot-end heat exchanger 11, and a second hot-end heat exchanger 12. The first outdoor heat exchanger 21 and the cold-end heat exchanger 13 exchange heat via a first refrigerant. The compressor 7 and the first hot-end heat exchanger 11 are circulated together via a first refrigerant pipeline 52. The first indoor heat exchanger 24 is located in the first refrigerant pipeline 52 and between the exhaust port of the compressor 7 and one end of the first hot-end heat exchanger 11. The first throttling element 91 is located in the first refrigerant pipeline 52 and between the exhaust port of the compressor 7 and the first indoor heat exchanger 24. The second indoor heat exchanger 25 is connected to the second hot end heat exchanger 12 through the second refrigerant pipeline 53. The two ends of the second refrigerant pipeline 53 are respectively connected to the suction port and the discharge port of the compressor 7. The second throttling element 92 is disposed in the second refrigerant pipeline 53 and is located between one end of the second indoor heat exchanger 25 and one end of the second hot end heat exchanger 12.

[0054] In one possible implementation, taking the first indoor heat exchanger 24 for producing domestic hot water and the second indoor heat exchanger 25 for exchanging heat with indoor air as an example, one end of the second indoor heat exchanger 25 is connected to the exhaust port of the compressor 7, and the other end of the second indoor heat exchanger 25 is connected to one end of the second throttling element 92. The other end of the second throttling element 92 is connected to one end of the second hot-end heat exchanger 12, and the other end of the second hot-end heat exchanger 12 is connected to the intake port of the compressor 7. When it is necessary to produce domestic hot water and blow hot air into the room, the thermoacoustic engine 1 and the compressor 7 operate. The thermoacoustic engine 1 uses the thermoacoustic effect to generate cooling in the cold-end heat exchanger 13 and heat in the first hot-end heat exchanger 11 and the second hot-end heat exchanger 12. The heat from the cold-end heat exchanger 13 is transferred to the first outdoor heat exchange section 21 through the first refrigerant, and then discharged through the first outdoor heat exchange section 21, for example, to the outdoor environment. Part of the high-temperature, high-pressure refrigerant discharged from compressor 7 passes through the first indoor heat exchanger 24, where it exchanges heat with water to produce domestic hot water. After heat exchange, the refrigerant is throttled and depressurized by the first throttling element 91, becoming a gas-liquid mixture. This gas-liquid mixture then absorbs heat through the first hot-end heat exchanger 11, turning into a gas and returning to compressor 7. The other part of the high-temperature, high-pressure refrigerant passes through the second indoor heat exchanger 25, where it exchanges heat with indoor air to blow hot air into the room. After heat exchange, the refrigerant is throttled and depressurized by the second throttling element 92, becoming a gas-liquid mixture. This gas-liquid mixture then absorbs heat through the second hot-end heat exchanger 12, turning into a gas and returning to compressor 7.

[0055] The multi-unit heat pump system of this application, by combining a thermoacoustic engine 1 with a traditional vapor compression cycle, can achieve a wider temperature range and improve the system's operating efficiency. Specifically, by setting a first hot-end heat exchanger 11 and a second hot-end heat exchanger 12 in the thermoacoustic engine 1, with the first indoor heat exchanger 24 exchanging heat with the first hot-end heat exchanger 11 and the second indoor heat exchanger 25 exchanging heat with the second hot-end heat exchanger 12, heat can be provided to the first indoor heat exchanger 24 and the second indoor heat exchanger 25 in low-temperature environments through the cascading of the thermoacoustic engine 1 and the compressor 7, thereby improving the system's operating capacity. Furthermore, since the heat transfer process of the thermoacoustic engine 1 is less affected by the external ambient temperature, the dual-unit heat pump system of this application has a significant advantage in operating efficiency compared to traditional heat pumps.

[0056] The following is combined Figure 1 This paper provides a detailed description of the first embodiment of the multi-unit heat pump system of this application. For example... Figure 1As 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 outdoor heat exchange unit 21, a first indoor heat exchanger 24, a second indoor heat exchanger 25, a first pump body 61, a first fan 41, a second fan 42, a compressor 7, a first throttling element 91, and a second throttling element 92.

[0057] 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.

[0058] 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 has a cavity for storing compressible gases such as helium or nitrogen, and a special acoustic structure is installed inside the thermoacoustic engine 11. Sound waves are emitted by a piston moving at high speed and reciprocating, driven by a driving device (such as a linear compressor or linear motor). When the sound waves propagate in the gas, a thermoacoustic effect is generated, and the gas molecules undergo periodic compression and expansion processes. 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, and the kinetic energy of the molecules is converted into internal energy, leading to an increase in gas temperature. During the expansion phase, the gas does work, its internal energy decreases, and its temperature decreases. The effect of the sound waves can be enhanced by a resonant tube or acoustic resonant cavity. Due to the reflection and superposition of the sound waves, relatively stable compression and expansion regions are formed in specific areas, thus creating cold and hot ends within the cavity. Furthermore, by installing heat exchangers at the cold and hot ends respectively, and a regenerator 14 between the two heat exchangers, the heat and cold energy can be extracted and utilized. Specifically, this application provides a cold-end heat exchanger 13 at the cold end and a first hot-end heat exchanger 11 and a second hot-end heat exchanger 12 at the hot end. The arrangement of the first hot-end heat exchanger 11 and the second hot-end heat exchanger 12 is not limited in this application; they can be arranged side-by-side along the direction of sound wave transmission, nested together in a direction perpendicular to the direction of sound wave transmission, or arranged intersectingly or alternately along the direction of sound wave transmission. In short, the goal is to ensure that the first hot-end heat exchanger 11 and the second hot-end heat exchanger 12 are reasonably arranged at the hot end of the cavity, allowing the medium in both heat exchangers to exchange heat with the hot end.

[0059] The first outdoor heat exchange section 21 is an air-cooled heat exchanger, which is circulatedly connected to the cold-end heat exchanger 13 through the first refrigerant pipeline 51. A first fan 41 is installed corresponding to the first outdoor heat exchange section 21. When the first fan 41 starts, it drives outdoor air to flow through the first outdoor heat exchange section 21 and exchange heat with the first refrigerant flowing through it. A first pump body 61 is installed in the first refrigerant pipeline 51. When the first pump body 61 starts, it drives the first refrigerant to circulate between the first outdoor heat exchange section 21 and the cold-end heat exchanger 13. The first refrigerant is selected with a freezing point of less than or equal to 0°C, more preferably a refrigerant with a freezing point of less than or equal to -40°C, such as brine, ethylene glycol, methanol, ethanol, or a mixture of ethylene glycol, methanol, ethanol, and water.

[0060] The first indoor heat exchanger 24 is a hot water heat exchanger used to produce domestic hot water, more specifically a coil heat exchanger, which is located inside the water heater or domestic water tank. The compressor 7, the first indoor heat exchanger 24, the first throttling element 91, and the first hot-end heat exchanger 11 are circulated together via the first refrigerant pipeline 52. Specifically, the exhaust port of the compressor 7 is connected to one end of the first indoor heat exchanger 24 (…). Figure 1 The right end shown is connected to the other end of the first indoor heat exchanger 24. Figure 1 The left end shown) and one end of the first throttling element 91 ( Figure 1 The right end shown is connected, and the other end of the first throttling element 91 ( Figure 1 The left end shown) and one end of the first hot end heat exchanger 11 (shown on the left) Figure 1 The lower end shown is connected, and the other end of the first hot end heat exchanger 11 (shown below) is connected. Figure 1 The upper end (as shown) is connected to the suction port of the compressor 7. Preferably, the first throttling element 91 is an electronic expansion valve.

[0061] The second indoor heat exchanger 25 is an air-cooled heat exchanger used for heat exchange with indoor air. A second fan 42 is installed corresponding to the second indoor heat exchanger 25. When the second fan 42 starts, it draws surrounding indoor air through the second indoor heat exchanger 25, exchanging heat with the refrigerant flowing through it. The second indoor heat exchanger 25, the second throttling element 92, and the second hot-end heat exchanger 12 are connected via a second refrigerant pipe 53. The two ends of the second refrigerant pipe 53 are connected to the exhaust port and intake port of the compressor 7, respectively. Specifically, one end of the second refrigerant pipe 53 ( Figure 1 The lower end shown is connected to the exhaust port of compressor 7 and one end of the first indoor heat exchanger 24. Figure 1 On the first refrigerant line 52 between the right end shown, in other words, the refrigerant discharged from the compressor 7 splits into two lines at this connection point. The other end of the second refrigerant line 53 (shown on the right) Figure 1The upper end shown is connected to the first refrigerant line 52 between the suction port of the compressor 7 and the first hot-end heat exchanger 11. In other words, the refrigerant in the second refrigerant line 53 merges with the refrigerant from the first refrigerant line 52 at this connection point. One end of the second indoor heat exchanger 25 (shown at the upper end) Figure 1 The right end shown is connected to the exhaust port of compressor 7, and the other end (shown on the right) is connected to the exhaust port of compressor 7. Figure 1 The left end shown) and one end of the second throttling element 92 ( Figure 1 The right end shown is connected, and the other end of the second throttling element 92 ( Figure 1 The left end shown) and one end of the second hot end heat exchanger 12 (shown) Figure 1 The lower end shown is connected, and the other end of the second hot end heat exchanger 12 (shown below) is connected. Figure 1 The upper end (as shown) is connected to the suction port of the compressor 7. Preferably, the second throttling element 92 is an electronic expansion valve.

[0062] The following is combined with Figure 1 The working principle of the dual-heat pump system according to the first embodiment of this application will be briefly introduced.

[0063] like Figure 1As shown, when there is a demand for indoor heating and domestic hot water production, the thermoacoustic engine 1 and compressor 7 start operating, the first throttling element 91 and the second throttling element 92 open to a certain degree, and the first fan 41, the second fan 42, and the first pump body 61 start operating. On one hand, the thermoacoustic engine 1 utilizes the thermoacoustic effect to generate cooling at the cold end heat exchanger 13 and heat at the first hot end heat exchanger 11 and the second hot end heat exchanger 12. The first pump body 61 drives the first refrigerant to circulate in the first refrigerant pipeline 51. When flowing through the cold end heat exchanger 13, the first refrigerant absorbs the cooling energy of the cold end heat exchanger 13. When the first refrigerant flows through the first outdoor heat exchange section 21, the first refrigerant exchanges heat with the outdoor ambient air, thereby discharging the cooling energy to the outdoor environment through the first outdoor heat exchange section 21. On the other hand, the high-temperature, high-pressure gaseous refrigerant discharged from compressor 7 is split into two paths. One path passes through the first indoor heat exchanger 24, where the refrigerant exchanges heat with the water in the water tank, causing the water temperature to rise and thus producing domestic hot water. After the heat exchange, the refrigerant's temperature drops, turning it into a liquid state. The liquid refrigerant is then cooled and depressurized by the first throttling element 91, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure gas-liquid mixture flows through the first hot-end heat exchanger 11, absorbing heat and rising to become gaseous. The other path passes through the second indoor heat exchanger 25, where the refrigerant exchanges heat with the indoor airflow, causing the indoor air temperature to rise and thus providing indoor heating. After heat exchange, the refrigerant cools down and becomes liquid. The liquid refrigerant is cooled and depressurized by the second throttling element 92 and becomes a low-temperature, low-pressure gas-liquid mixture refrigerant. When the low-temperature, low-pressure gas-liquid mixture refrigerant flows through the second hot-end heat exchanger 12, it absorbs the heat from the second hot-end heat exchanger 12 and heats up to form a gas. Then, it merges with the gaseous refrigerant discharged from the first hot-end heat exchanger 11 and flows back to the compressor 7 for secondary heating.

[0064] The above configuration, with the first refrigerant having a freezing point of -40℃ or less, helps improve the operational stability of the dual-heat pump system under outdoor low or even ultra-low temperature conditions, enabling stable operation of the dual-heat pump system in ultra-low temperature environments. By employing a cascade configuration of thermoacoustic engine 1 and compressor 7, the refrigerant can be heated twice during operation, thereby improving the operating performance at low temperatures and enabling the system to operate across a wide temperature range.

[0065] The following is combined with Figures 2 to 6 The second embodiment of the multi-unit heat pump system of this application is described below.

[0066] like Figure 2As shown, based on the first embodiment, this embodiment of the dual-heat pump system adds a second outdoor heat exchange section 22, a third outdoor heat exchange section 23, a third refrigerant pipeline 54, a fourth cooling pipeline, a four-way valve 8, a first valve body 31, and a second valve body 33. Additionally, the location of the second indoor heat exchanger 25 is adjusted. Specifically, in this embodiment, the second indoor heat exchanger 25, the second throttling element 92, and the second hot-end heat exchanger 12 are connected via the second refrigerant pipeline 53, with one end of the second refrigerant pipeline 53 (… Figure 2 The lower end shown is connected to the exhaust port of compressor 7 and one end of the first indoor heat exchanger 24. Figure 2 On the first refrigerant line 52 between the right end shown, in other words, the refrigerant discharged from the compressor 7 splits into two lines at this connection point. The other end of the second refrigerant line 53 (shown on the right) Figure 2 The upper end shown is connected to the first refrigerant line 52 between the suction port of the compressor 7 and the first hot-end heat exchanger 11. In other words, the refrigerant in the second refrigerant line 53 merges with the refrigerant from the first refrigerant line 52 at this connection point. One end of the second indoor heat exchanger 25 (shown at the upper end) Figure 2 The right end (shown) is connected to the intake port of compressor 7, and the other end ( Figure 2 The left end shown) and one end of the second throttling element 92 ( Figure 2 The right end shown is connected, and the other end of the second throttling element 92 ( Figure 2 The left end shown) and one end of the second hot end heat exchanger 12 (shown) Figure 2 The upper end shown is connected, and the other end of the second hot end heat exchanger 12 (shown) is connected. Figure 2 The lower end (as shown) is connected to the exhaust port of compressor 7.

[0067] The second outdoor heat exchange unit 22 is installed on the third refrigerant pipe 54, and the first end of the third refrigerant pipe 54 ( Figure 2 The lower end shown is connected to one end of the first hot-end heat exchanger 11. Figure 2 On the first refrigerant line 52 between the lower end shown and the first throttling element 91, at the second end of the third refrigerant line 54 (shown at the lower end), Figure 2 The upper end shown is connected to the other end of the first hot-end heat exchanger 11. Figure 2 The first refrigerant line 52, shown at the upper end, is located between the compressor 7 and the suction port of the compressor 7. The third outdoor heat exchange unit 23 is located on the fourth refrigerant line 55, and the first end of the fourth refrigerant line 55 (shown at the upper end) is located on the first refrigerant line 52. Figure 2 The upper end shown is connected to one end of the second hot-end heat exchanger 12. Figure 2 On the second refrigerant line 53 between the upper end shown and the second throttling element 92, at the second end of the fourth refrigerant line 55 (shown at the upper end), Figure 2 The lower end shown is connected to the other end of the second hot-end heat exchanger 12. Figure 2On the second refrigerant line 53 between the lower end shown and the exhaust port of the compressor 7.

[0068] The first valve body 31 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 port of the four-way valve 8, one end of the first hot-end heat exchanger 11, and one end of the second outdoor heat exchange section 22, 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. The second valve body 33 is also a three-way control valve, and the first interface of this 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-hand interface of the three-way control valve is connected to the first refrigerant pipeline 52 between the four-way valve 8 and the first indoor heat exchanger 24, one end of the second hot-end heat exchanger 12, and one end of the third outdoor heat exchanger 23. 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.

[0069] The first outdoor heat exchange section 21, the second outdoor heat exchange section 22, and the third outdoor heat exchange section 23 are all air-cooled heat exchangers, and all three belong to the same heat exchanger. Their arrangement 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-bottom, etc., and their internal flow paths are independent and do not affect each other. Preferably, the three are arranged sequentially along the airflow direction, with the third outdoor heat exchange section 23 located at the upstream end of the airflow direction, and the first outdoor heat exchange section 21 and the second outdoor heat exchange section 22 located downstream of the third outdoor heat exchange section 23.

[0070] The four ports of the four-way valve 8 are respectively connected to the discharge port of the compressor 7, the branch end of the second refrigerant line 53 and the first refrigerant line 52, the confluence end of the second refrigerant line 53 and the first refrigerant line 52, and the suction port of the compressor 7. Among them, the branch end and the confluence end of the second refrigerant line 53 and the first refrigerant line 52 are also the connection points between the two ends of the second refrigerant line 53 and the first refrigerant line 52.

[0071] The following is combined with Figures 3 to 6 The operating principle of the multi-unit heat pump system in the second embodiment of this application is introduced.

[0072] First refer to Figure 3When a user has a need for cooling and rapid production of domestic hot water, the thermoacoustic unit 1, compressor 7, first fan 41, second fan 42, and first pump body 61 start operation. The first throttling element 91 and the second throttling element 92 both open to a certain degree, and the first port of the first valve body 31 ( Figure 3 Right side interface) and second interface ( Figure 3 The upper interface is connected, and the first interface of the second valve body 33 is connected. Figure 3 Right side interface) and third interface ( Figure 3 (Left interface) Connected. During operation, the thermoacoustic machine 1 generates heat and cooling through the thermoacoustic effect. The first pump body 61 drives the first refrigerant to circulate between the cold-end heat exchanger 13 and the first outdoor heat exchange section 21. When the first refrigerant passes through the cold-end heat exchanger 13, it absorbs the cooling energy in the cold-end heat exchanger 13 and cools down. When the first refrigerant continues to flow through the first outdoor heat exchange section 21, it exchanges heat with the outdoor ambient air, absorbs the heat of the outdoor air and heats up, and the corresponding outdoor air temperature decreases. On the other hand, the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 7 is divided into two paths. One path passes through the first indoor heat exchanger 24 and exchanges heat with the water in the water tank to realize the production of domestic hot water. After heat exchange, the refrigerant cools down to a liquid state. The liquid refrigerant continues to flow through the first throttling element 91, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure refrigerant absorbs heat from the first hot-end heat exchanger 11, causing it to heat up and vaporize. The vaporized refrigerant returns to the compressor 7 to continue its heating and circulation. Another stream of refrigerant passes through the third outdoor heat exchange section 23, exchanging heat with the outdoor air and absorbing its cooling capacity, thus cooling down to a liquid state. Correspondingly, the outdoor air temperature rises. The outdoor air continues to flow through the downstream first outdoor heat exchange section 21, exchanging heat with it. The cooled, liquid refrigerant then flows through the second throttling element 92, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure refrigerant exchanges heat with the indoor air when passing through the second indoor heat exchanger 25, thus lowering the indoor air temperature and achieving cooling of the room. After heat exchange, the refrigerant temperature rises to a gaseous state and merges with the refrigerant discharged from the first hot-end heat exchanger 11 before returning to the compressor 7. Of course, when there is only a need to produce domestic hot water, the second throttling element 92 and the second fan 42 can be turned off. Or when there is only a need for indoor cooling, the thermoacoustic motor 1, the first pump body 61, and the first throttling element 91 can be turned off.

[0073] Next, refer to Figure 4 When a user has a need for cooling and regular domestic hot water production, the thermoacoustic unit 1 and the first pump body 61 stop, and the compressor 7, the first fan 41, and the second fan 42 start running. The first throttling element 91 and the second throttling element 92 both open to a certain degree, and the first port of the first valve body 31 ( Figure 4 Right side interface) and third interface ( Figure 4 The left-side interface is connected, and the first interface of the second valve body 33 is connected. Figure 4Right side interface) and third interface ( Figure 4 (Left interface) Connected. The high-temperature, high-pressure gaseous refrigerant discharged from compressor 7 is divided into two paths. One path of refrigerant passes through the third outdoor heat exchanger 23, where it exchanges heat with the outdoor air, absorbing the cold air and cooling down to a liquid state, correspondingly increasing the outdoor air temperature. The cooled liquid refrigerant flows through the second throttling element 92, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure refrigerant exchanges heat with the indoor air when passing through the second indoor heat exchanger 25, thus lowering the indoor air temperature and achieving cooling. The refrigerant, after heat exchange, rises to a gaseous state and flows back to compressor 7. The other path of refrigerant passes through the first indoor heat exchanger 24 and exchanges heat with the water in the water tank, achieving the production of domestic hot water. After heat exchange, the refrigerant cools to a liquid state. The liquid refrigerant continues to flow through the first throttling element 91, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. This low-temperature, low-pressure refrigerant then exchanges heat with the outdoor air heated by the third outdoor heat exchange element 23 as it passes through the second outdoor heat exchange section 22. It absorbs heat from the outdoor air and vaporizes. The vaporized refrigerant then merges with the refrigerant discharged from the second indoor heat exchanger 25 and returns to the compressor 7. Of course, when only domestic hot water production is needed, the second throttling element 92 and the second fan 42 can be shut off. Or, when only indoor cooling is needed, the first throttling element 91 can be shut off.

[0074] Next, refer to Figure 5 When the outdoor ambient temperature is low and the user has a need for rapid heating, the four-way valve 8 reverses, and the compressor 7, thermoelectric machine 1, first fan 41, second fan 42, and first pump body 61 start operation. The first throttling element 91 closes, and the second throttling element 92 opens to a certain degree. The first port of the second valve body 33 ( Figure 5 The middle right interface) and the second interface ( Figure 5 (Upper and middle interface) Connected. During operation, the thermoacoustic machine 1 generates heat and cooling through the thermoacoustic effect. The first pump body 61 drives the first refrigerant to circulate between the cold-end heat exchanger 13 and the first outdoor heat exchange section 21. When the first refrigerant passes through the cold-end heat exchanger 13, it absorbs the cooling energy in the cold-end heat exchanger 13 and cools down. When the first refrigerant continues to flow through the first outdoor heat exchange section 21, it exchanges heat with the outdoor ambient air, absorbs the heat of the outdoor air and rises in temperature, and the corresponding outdoor air temperature decreases. The high-temperature and high-pressure gaseous refrigerant discharged by the compressor 7 first passes through the second indoor heat exchanger 25, where it exchanges heat with the indoor air, thus raising the indoor air temperature and achieving heating of the room. After heat exchange, the refrigerant cools down to a liquid state. The liquid refrigerant flows through the second throttling element 92 and cools down and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture refrigerant. When the low-temperature, low-pressure refrigerant passes through the second hot-end heat exchanger 12, it absorbs the heat from the second hot-end heat exchanger 12 and heats up to vaporize. The vaporized refrigerant returns to the compressor 7 to continue heating and cycling.

[0075] Finally refer to Figure 6When the outdoor ambient temperature is high and the user has regular heating needs, the four-way valve 8 reverses, the compressor 7, the first fan 41, and the second fan 42 start running, the thermoacoustic machine 1 and the first pump body 61 stop, the first throttling element 91 closes, the second throttling element 92 opens to a certain degree, and the first port of the second valve body 33 ( Figure 5 The right-side interface and the third interface Figure 5 (Connected to the left-hand interface). The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 7 first passes through the second indoor heat exchanger 25, where it exchanges heat with the indoor air, thus raising the temperature of the indoor air and achieving heating for the room. After heat exchange, the refrigerant cools down to a liquid state. The liquid refrigerant flows through the second throttling element 92, where it cools and depressurizes, becoming a low-temperature, low-pressure gas-liquid mixture. When the low-temperature, low-pressure refrigerant passes through the third outdoor heat exchange section 23, it exchanges heat with the outdoor air, absorbing heat from the outdoor air and vaporizing. The vaporized refrigerant then returns to the compressor 7.

[0076] By setting up a second outdoor heat exchanger 22 and a third outdoor heat exchanger 23, the first indoor heat exchanger 24 and the second indoor heat exchanger 25 can operate independently without turning on the thermoacoustic machine 1, thereby improving the system's applicability to different scenarios and ensuring product operating efficiency. Since the first outdoor heat exchanger 21, the second outdoor heat exchanger 22, and the third outdoor heat exchanger 23 belong to the same heat exchanger, a high degree of integration and functional reuse of the heat exchangers can be achieved, thereby reducing system structural complexity and improving system integration. By placing the third outdoor heat exchanger 23 at the upstream end of the airflow direction, the heat exchange effect of the first outdoor heat exchanger 21 and the second outdoor heat exchanger 22 can be improved, thus increasing system efficiency. By setting up a four-way valve 8, multi-mode operation of the system can be achieved, further expanding the system's application scenarios.

[0077] The following is combined with Figure 7 and Figure 8 The third embodiment of the dual-heat pump system of this application will be briefly introduced.

[0078] like Figure 7 As 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 15. Each thermoacoustic unit includes a compression section 16 and a heat exchange section. The compression section 16 is a linear compressor, which includes electromagnetic components, a power piston, a spring, an exhaust fan, etc. The heat exchange section includes a first hot-end heat exchanger 11, a second hot-end heat exchanger 12, a regenerator 14, and a cold-end heat exchanger 13. An expansion chamber and a compression chamber are formed within the housing 15. The cold-end heat exchanger 13 is located in the expansion chamber, the two hot-end heat exchangers are located in the compression chamber, and the regenerator 14 is located between the cold-end heat exchanger 13 and the two hot-end heat exchangers. Further, as... Figure 8As shown, in this application, two cold-end heat exchangers 13 are positioned opposite each other (i.e., the two cold-end heat exchangers 13 are close to each other and facing each other), and a partition 17 is provided between the two cold-end heat exchangers 13 to separate the two thermoacoustic units. The first hot-end heat exchanger 11 and the second hot-end heat exchanger 12 are nested within each other in the compression chamber, wherein the first hot-end heat exchanger 11 is located inside the second hot-end heat exchanger 12. (Return to Reference) Figure 7 The first outdoor heat exchange section 21 exchanges heat with the two cold-end heat exchangers 13 through a first refrigerant. The suction port of the compressor 7 is connected to one end of at least one first hot-end heat exchanger 11, the first throttling element 91 is connected to both ends of at least one first hot-end heat exchanger 11, one end of the second refrigerant pipeline 53 is connected to one end of at least one second hot-end heat exchanger 12, and the second throttling element 92 is connected to both ends of at least one second hot-end heat exchanger 12. Specifically, the inlet of the first outdoor heat exchange section 21 ( Figure 7 The upper port shown is simultaneously connected to one end of both cold-end heat exchangers 13. Figure 7 The upper end shown is connected to the outlet of the first outdoor heat exchange section 21. Figure 7 The lower port shown is simultaneously connected to the other end of the two cold-end heat exchangers 13. Figure 7 The lower end of the compressor 7 is connected to the first end of the two first hot end heat exchangers 11 through the first refrigerant pipe 52. At this time, the two cold end heat exchangers 13 form a structure similar to a "parallel" connection in electrical circuitry. Figure 7 The upper end shown is connected, and one end of the first throttling element 91 is simultaneously connected to the second end of the two first hot end heat exchangers 11. Figure 7 The lower end of the second refrigerant pipe 53 is connected, at which point the two first hot-end heat exchangers 11 form a structure similar to a "parallel" connection in electrical circuitry. Figure 7 The upper end shown) is simultaneously connected to the first end of the two second hot end heat exchangers 12 (as shown above). Figure 7 The upper end shown is connected, and one end of the second throttling element 92 is simultaneously connected to the second end of the two second hot end heat exchangers 12. Figure 7 The lower end is connected, and at this time the two second hot end heat exchangers 12 form a structure similar to "parallel" in electricity.

[0079] Thus, by setting two thermoacoustic units in thermoacoustic unit 1, 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. Placing the two thermoacoustic units within the same housing 15 and separating the heat exchange sections by a partition 17 simplifies the manufacturing process, eliminating the need for specific design of the interior of housing 15. The working principle of the above embodiment can be referred to the first embodiment, and will not be repeated here.

[0080] 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.

[0081] For example, in an alternative embodiment, although the above embodiment is described with the first outdoor heat exchange unit 21, the second outdoor heat exchange unit 22, and the third outdoor heat exchange unit 23 all being air-cooled heat exchangers, the specific form of the outdoor heat exchange units is not unique, and those skilled in the art can adjust it. For example, at least one of the heat exchange units 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 all the outdoor heat exchange units are liquid-cooled heat exchangers, the corresponding fan can be omitted.

[0082] For example, in another alternative embodiment, the arrangement of the first outdoor heat exchange unit 21, the second outdoor heat exchange unit 22 and the third outdoor heat exchange unit 23 belonging to the same heat exchanger in the above embodiment is only a preferred option. In other embodiments, those skilled in the art can also set the three separately and independently, for example, setting three outdoor heat exchangers, 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.

[0083] For example, in another alternative embodiment, although the second embodiment described above is introduced in conjunction with the simultaneous provision of the second outdoor heat exchange unit 22 and the third outdoor heat exchange unit 23, this arrangement is merely exemplary. Those skilled in the art can choose whether to simultaneously provide the second outdoor heat exchange unit 22 and the third outdoor heat exchange unit 23 based on the specific application scenario. This adjustment method does not deviate from the principle of this application.

[0084] For example, in another alternative embodiment, although the above embodiments are all described with the example of the first indoor heat exchanger 24 being a hot water heat exchanger and the second indoor heat exchanger 25 being an air-cooled heat exchanger, the specific configuration of the first indoor heat exchanger 24 and the second indoor heat exchanger 25 is not limited to this. Those skilled in the art can choose the specific form of the two based on the specific application scenario. For example, when the second indoor heat exchanger 25 is an air-cooled heat exchanger, the first indoor heat exchanger 24 can also be replaced with a heating heat exchanger. The heating heat exchanger can be installed in a heating water tank filled with heating water, and heat exchange is achieved through heat exchange between the heating water and the refrigerant. Furthermore, one of the first indoor heat exchanger 24 and the second indoor heat exchanger 25 can also be a heating heat exchanger, and the other a hot water heat exchanger.

[0085] For example, in another alternative implementation, the first indoor heat exchanger 24 can be replaced by a finned heat exchanger or the like, as long as the replaced heat exchanger can effectively heat the water in the water tank.

[0086] For example, in another alternative embodiment, the arrangement of the first outdoor heat exchange unit 21 being circulatedly connected to the cold-end heat exchanger 13 via the first refrigerant pipe 51 is merely exemplary. Those skilled in the art can adjust it to suit more specific application scenarios. For instance, the first outdoor heat exchange unit 21 may be a heat pipe heat exchanger, with its evaporator end exchanging heat with the outdoor environment, such as through a fan. The condenser end of the heat pipe heat exchanger exchanges heat with the cold-end heat exchanger 13, such as by contacting the condenser end with the cold-end heat exchanger 13. A first refrigerant is filled inside the heat pipe heat exchanger; this first refrigerant can be water, alcohol, ammonia solution, etc. By using a heat pipe heat exchanger in the first outdoor heat exchange unit 21, the heat exchange effect can be improved, and the first pump body 61 can be omitted, reducing system setup costs.

[0087] Alternatively, a loop heat pipe can be formed between the first outdoor heat exchange section 21 and the cold-end heat exchanger 13 via a pipeline, with the first refrigerant filling the loop heat pipe. In this case, the condenser of the loop heat pipe is the cold-end heat exchanger 13. The gaseous first refrigerant exchanges heat with the cold air in the condenser and cools down to liquefy. A capillary structure needs to be installed inside the loop heat pipe to provide a pressure drop. The evaporator of the loop heat pipe is the first outdoor heat exchange section 21, where the liquid first refrigerant exchanges heat with the outdoor air and heats up to vaporize. The first refrigerant, which can be an ammonia solution, Freon, water, etc., can be filled in the loop heat pipe. The loop heat pipe formed between the first outdoor heat exchange section 21 and the cold-end heat exchanger 13 is easy to install, eliminates the need for the first pump body 61, and is suitable for long-distance refrigerant transmission.

[0088] For example, in another alternative implementation, the above-described implementation is introduced by taking the setting of a three-way control valve to change the refrigerant flow direction as an example. 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.

[0089] For example, in another alternative embodiment, although the above embodiments are described with the example of a first refrigerant having a freezing point of less than or equal to -40°C, the specific selection of the first refrigerant is not fixed, and those skilled in the art can make the selection based on the specific application scenario. For example, in areas with high outdoor ambient temperatures, water can also be selected as the first refrigerant, or other refrigerants with a freezing point of less than or equal to 0°C can be used.

[0090] For example, in another alternative embodiment, although some of the above embodiments are described with the example of having a four-way valve 8, this is only 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.

[0091] 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 15, this is only a preferred embodiment. In other embodiments, two separate thermoacoustic units 1 can also be arranged opposite each other.

[0092] 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 17, 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 13 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.

[0093] For example, in another alternative implementation, although the third implementation described above is based on the example of two cold-end heat exchangers 13 facing each other, this is only one possible implementation. The specific arrangement depends on the specific form of the heat exchange section. For example, when the hot end of the heat exchange section is located at the outermost edge of the thermoacoustic unit, the two hot ends can also be arranged to face each other.

[0094] For example, in another alternative embodiment, the specific form of the compression unit 16 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.

[0095] For example, in another alternative embodiment, although the third embodiment described above is illustrated by setting the two cold-end heat exchangers 13, the two first hot-end heat exchangers 11, and the two second hot-end heat exchangers 12 in a "parallel" configuration, this is merely for illustrating 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 13, the two first hot-end heat exchangers 11, or the two second hot-end heat exchangers 12 can be changed to make this application applicable to more specific application scenarios. For example, the two cold-end heat exchangers 13, the two first hot-end heat exchangers 11, and the two second hot-end heat exchangers 12 can be "connected in series," that is, the first refrigerant passes through the two cold-end heat exchangers 13 before exchanging heat with the first outdoor heat exchange section 21, the refrigerant after the first throttling element 91 passes through the two first hot-end heat exchangers 11 before returning to the compressor 7, and the refrigerant after the second throttling element 92 passes through the two second hot-end heat exchangers 12 before returning to the compressor 7.

[0096] 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 first refrigerant pipe 52 to form a triple-heat pump system together with the hot water heat exchanger and the air-cooled heat exchanger.

[0097] 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.

[0098] 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.

[0099] 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-unit heat pump system, characterized in that, include: A thermoacoustic machine, comprising a cold-end heat exchanger, a first hot-end heat exchanger, and a second hot-end heat exchanger. The first outdoor heat exchange section exchanges heat with the cold end heat exchanger through a first refrigerant. The compressor is connected to the first hot-end heat exchanger via a first refrigerant pipeline. The first indoor heat exchanger is disposed in the first refrigerant pipeline and located between the exhaust port of the compressor and one end of the first hot end heat exchanger. The first throttling element is disposed in the first refrigerant pipeline and located between the compressor's exhaust port and the first indoor heat exchanger; The second indoor heat exchanger is connected to the second hot end heat exchanger via a second refrigerant pipeline, and the two ends of the second refrigerant pipeline are respectively connected to the suction port and the exhaust port of the compressor. The second throttling element is disposed in the second refrigerant pipeline and located between one end of the second indoor heat exchanger and one end of the second hot end heat exchanger.

2. The multi-unit heat pump system according to claim 1, characterized in that, The first outdoor heat exchange section is circulatedly connected to the cold-end heat exchanger via a first refrigerant pipeline. The multi-unit heat pump system further includes a first pump body, which is disposed in the first refrigerant pipeline, and a first refrigerant is filled in the first refrigerant pipeline; or The first outdoor heat exchange section is a heat pipe heat exchanger, wherein the condensing end of the heat pipe heat exchanger exchanges heat with the cold end heat exchanger, and a first refrigerant is filled in the heat pipe heat exchanger; or The first outdoor heat exchange section and the cold end heat exchanger are connected by a pipeline to form a loop heat pipe, and the first refrigerant is filled in the loop heat pipe.

3. The multi-unit heat pump system according to claim 1, characterized in that, The other end of the second indoor heat exchanger is connected to the exhaust port of the compressor, and the other end of the second hot end heat exchanger is connected to the suction port of the compressor. or The other end of the second indoor heat exchanger is connected to the air intake of the compressor, and the other end of the second hot end heat exchanger is connected to the exhaust port of the compressor.

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 and a third refrigerant pipeline. The second outdoor heat exchange section is disposed on the third refrigerant pipeline. The first end of the third refrigerant pipeline is connected to the first refrigerant pipeline between one end of the first hot end heat exchanger and the first throttling element. The second end of the third refrigerant pipeline is connected to the first refrigerant pipeline between the other end of the first hot end heat exchanger and the suction port of the compressor. The multi-unit heat pump system further includes a first valve body or a first valve group, which is configured to selectively control the flow of refrigerant through the first hot-end heat exchanger or the second outdoor heat exchange section.

5. The multi-unit heat pump system according to claim 1 or 4, characterized in that, The multi-generation heat pump system further includes a third outdoor heat exchange section and a fourth refrigerant pipeline. The third 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 second 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 second hot end heat exchanger and the suction port or exhaust port of the compressor. The multi-unit heat pump system further includes a second valve body or a second valve group, which is configured to selectively control the flow of refrigerant through the second hot-end heat exchanger or the third outdoor heat exchange section.

6. The multi-unit heat pump system according to claim 5, which directly references claim 4, is characterized in that, The multi-unit heat pump system further includes a first fan, and at least one of the first outdoor heat exchange section, the second outdoor heat exchange section, and the third outdoor heat exchange section is an air-cooled heat exchanger; and / or The first outdoor heat exchange section, the second outdoor heat exchange section, and the third outdoor heat exchange section are independent of each other or belong to different parts of the same heat exchanger; The third outdoor heat exchange unit is located at the upstream end of the airflow direction.

7. The multi-unit heat pump system according to claim 1, 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 compressor's exhaust port, the branch end of the second refrigerant pipeline and the first refrigerant pipeline, the confluence end of the second refrigerant pipeline and the first refrigerant pipeline, and the compressor's suction port.

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, the second indoor heat exchanger is an air-cooled heat exchanger, and the multi-unit heat pump system further includes a second fan, which is configured corresponding to the second indoor heat exchanger; or One of the first indoor heat exchanger and the second indoor heat exchanger is a heating heat exchanger, and the other is a hot water heat exchanger.

9. The multi-unit heat pump system according to claim 1, characterized in that, The thermoacoustic machine 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 first hot-end heat exchanger, a second hot-end heat exchanger, a regenerator, and a cold-end heat exchanger. The first outdoor heat exchange section exchanges heat with the two cold-end heat exchangers through a first refrigerant. The suction port of the compressor is connected to one end of at least one of the first hot-end heat exchangers. The first throttling element is connected to both ends of at least one of the first hot-end heat exchangers. One end of the second refrigerant pipeline is connected to one end of at least one of the second hot-end heat exchangers. The second throttling element is connected to both ends of at least one of the second hot-end heat exchangers.

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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