Thermoacoustic heat pump system

Abstract

The present application relates to the technical field of heat pump, especially to a thermoacoustic heat pump system, which comprises a compression device, an ejector, a first heat exchanger, a regenerator and a second heat exchanger. The ejector moves in response to the acoustic power and pressure fluctuation generated by the compression device, and a first cavity is formed on the inner side of the ejector, and a second cavity is formed between the outer side of the ejector and the compression device; the regenerator is connected with the first heat exchanger, used for converting acoustic power into heat pumping capacity, and a third cavity is arranged on the inner side of the regenerator, which is communicated with the first heat exchanger and the first cavity respectively; the second heat exchanger is connected with the regenerator and the second cavity. Wherein, the first heat exchanger is arranged away from the compression device compared with the second heat exchanger. The present application provides a thermoacoustic heat pump system, which changes the energy flow path by setting the third cavity, exchanges the positions of the first heat exchanger and the second heat exchanger, keeps the high-temperature side away from the compression device, ensures the heat pump efficiency and operation stability, and prolongs the service life.

Description

Technical Field

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

[0002] Ultra-high temperature heat pumps typically refer to heat pump systems capable of outputting heat sources at approximately 120℃–200℃ and above. They are used in scenarios such as industrial steam supply, chemical and food processing drying, paper and textile finishing, refining and metallurgical waste heat recovery, high-temperature sections of district heating, and electrification of high-temperature process heating. Compared to gas boilers or resistance heating, heat pumps utilize ambient heat / waste heat to "transfer heat," theoretically possessing the potential for higher energy efficiency and lower carbon emissions. Therefore, their demand has increased significantly under the trend of industrial emission reduction and electrification.

[0003] A thermoacoustic heat pump is a heat pump structure that utilizes acoustic vibrations in a piston-driven gas stream to achieve energy transfer. Compared to traditional heat pumps, it features higher temperature output, lower vibration noise, a wider range of applications, and greater energy efficiency and environmental friendliness, attracting attention from both academia and industry. In existing technologies, the electrically driven free-piston Stirling heat pump structure comprises a heat pump unit and a compressor unit. Its specific working principle is as follows: a copper coil carrying an alternating current generates a constantly changing magnetic field, and the electromagnetic force drives the piston to reciprocate, thereby transferring acoustic power and pressure fluctuations into the compression chamber. The acoustic power sequentially passes through the exhaust fan, room temperature heat exchanger, regenerator, and high-temperature heat exchanger. In the regenerator, it is utilized to produce a pumping effect, and finally, heat is transferred from the room temperature heat exchanger to the high-temperature heat exchanger and output to external devices.

[0004] However, when traditional free-piston Stirling heat pumps achieve ultra-high temperature heat pumping, the compressor performance is easily affected by high temperatures, leading to a decline in performance and reliability of the heat pump when operating in the ultra-high temperature range. Summary of the Invention

[0005] This invention provides a thermoacoustic heat pump system to address the shortcomings of existing free-piston Stirling heat pumps, where compressor performance is easily affected by high temperatures, leading to performance degradation and reduced performance and reliability in ultra-high temperature ranges. This invention designs an opposing exhaust unit operating at room temperature and swaps the positions of the room temperature and high temperature heat exchangers. A thermal buffer tube is installed between the high temperature and room temperature heat exchangers to reduce heat transfer loss. This concentrates the high temperature at the top output, establishing a smoother and more stable temperature gradient. Furthermore, by keeping the high-temperature side away from mechanical components such as motors and springs, thermal deformation and plastic deformation caused by high temperatures are avoided, significantly extending the heat pump's service life.

[0006] This invention provides a thermoacoustic heat pump system, comprising: Compression device used to generate acoustic power and pressure fluctuations; The discharge device moves in response to acoustic power and pressure fluctuations generated by the compression device, and a first cavity is formed inside the discharge device, and a second cavity is formed between the discharge device and the compression device on the outside of the discharge device. The first heat exchanger is used to fill a high-temperature, high-pressure gaseous working fluid; A regenerator, connected to the first heat exchanger, is used to convert acoustic power into pumping heat, and a third cavity is provided inside the regenerator, which is connected to the first heat exchanger and the first cavity respectively. The second heat exchanger is connected to the regenerator and the second cavity; The first heat exchanger is positioned further away from the compression device than the second heat exchanger.

[0007] According to the thermoacoustic heat pump system of the present invention, the first heat exchanger is a U-tube heat exchanger, with one end connected to the third cavity and the other end connected to the regenerator.

[0008] According to the thermoacoustic heat pump system of the present invention, the second heat exchanger is a tube bundle heat exchanger, which forms a heat exchange space by being enclosed by an outer wall, and a plurality of tube bundles are arranged in the heat exchange space, at least a portion of the tube bundles being connected between the regenerator and the second cavity.

[0009] According to the thermoacoustic heat pump system of the present invention, at least a portion of the tube bundle is connected between the third cavity and the first cavity.

[0010] According to the thermoacoustic heat pump system of the present invention, the first cavity is a tapered tube structure, and the larger end of the inner diameter of the tapered tube structure is close to the third cavity, and the smaller end of the inner diameter of the tapered tube structure is close to the discharge device.

[0011] According to the thermoacoustic heat pump system of the present invention, multiple compression devices are provided and are arranged in a opposed manner at the bottom of the second heat exchanger.

[0012] According to the thermoacoustic heat pump system of the present invention, the compression device includes: Outer stator; The inner stator is located inside the outer stator; A coil is connected to an external excitation power supply and is located between the outer stator and the inner stator; The piston is movably disposed inside the inner stator and reciprocates through the alternating magnetic field generated by the coil; The piston has a second cavity formed on one side and the outer side of the discharge device, and a fourth cavity on the other side.

[0013] The thermoacoustic heat pump system according to the present invention further includes: An elastic element, connected to the discharge device, provides elastic restoring force to the discharge device.

[0014] The thermoacoustic heat pump system according to the present invention further includes: A fixed bracket is disposed near the first cavity, one end of the elastic element is connected to the fixed bracket, and the other end of the elastic element is connected to the discharge device.

[0015] According to the thermoacoustic heat pump system of the present invention, the elastic element is disposed in the fourth cavity; The thermoacoustic heat pump system also includes: A connecting rod, one end of which is connected to the elastic element, and the other end of which passes through the piston and is connected to the discharge device.

[0016] This invention provides a thermoacoustic heat pump system, comprising: a compressor, an exhaust valve, a first heat exchanger, a regenerator, and a second heat exchanger. The compressor generates acoustic power and pressure fluctuations; the exhaust valve moves in response to the acoustic power and pressure fluctuations generated by the compressor, and a first cavity is formed inside the exhaust valve, while a second cavity is formed between the exhaust valve and the compressor on the outside of the exhaust valve; the first heat exchanger is filled with a high-temperature, high-pressure gaseous working fluid; the regenerator is connected to the first heat exchanger and converts acoustic power into pumping heat, and a third cavity is provided inside the regenerator, which is connected to both the first heat exchanger and the first cavity; the second heat exchanger is connected to both the regenerator and the second cavity. The first heat exchanger is positioned further away from the compressor than the second heat exchanger. This thermoacoustic heat pump system, by setting a third cavity to change the energy flow path and swap the positions of the first and second heat exchangers, moves the high-temperature side away from the compressor, ensuring heat pump efficiency and operational stability, and extending service life. Attached Figure Description

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

[0018] Figure 1 This is a schematic diagram of the structure of a thermoacoustic heat pump system provided in one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a thermoacoustic heat pump system provided in one embodiment of the present invention.

[0020] Figure 3This is a schematic diagram of the structure of a thermoacoustic heat pump system provided in one embodiment of the present invention.

[0021] Figure label: 1. First heat exchanger; 2. Regenerator; 3. Third chamber; 4. Second heat exchanger; 5. Second chamber; 6. Outer stator; 7. Coil; 8. Inner stator; 9. Piston; 10. Fourth chamber; 11. Discharge device; 12. First chamber; 13. Elastic element; 14. Fixed bracket; 15. Connecting rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0023] In the description of this embodiment, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this embodiment.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this embodiment, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this embodiment, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0026] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] The following is combined Figures 1-3 This invention describes a thermoacoustic heat pump system. The thermoacoustic heat pump system includes: a compressor, an exhaust device 11, a first heat exchanger 1, a regenerator 2, and a second heat exchanger 4.

[0028] The compressor device generates acoustic power and pressure fluctuations. The discharge device 11 moves in response to these acoustic power and pressure fluctuations, and a first cavity 12 is formed inside the discharge device 11, while a second cavity 5 is formed between the discharge device 11 and the compressor device. A first heat exchanger 1 is filled with a high-temperature, high-pressure gaseous working fluid. A regenerator 2 is connected to the first heat exchanger 1 and converts acoustic power into pumping heat. A third cavity 3 is located inside the regenerator 2 and communicates with both the first heat exchanger 1 and the first cavity 12. A second heat exchanger 4 is connected to the regenerator 2 and the second cavity 5. The first heat exchanger 1 is positioned further away from the compressor device than the second heat exchanger 4.

[0029] Overall, the thermoacoustic heat pump system of the present invention consists of a heat pump unit and two opposing compressor-room temperature discharge unit 11 units. The heat pump unit includes a first heat exchanger 1, a regenerator 2, a second heat exchanger 4, and a compression chamber (i.e., a third chamber 3). The compressor-room temperature discharge unit 11 includes an expansion and compression device and a discharge unit 11. A front chamber (i.e., a first chamber 12) is provided between the heat pump unit and the compressor-room temperature discharge unit 11, and an expansion chamber (i.e., a second chamber 5) is provided between the piston 9 and the room temperature discharge unit 11, which is also connected to the second heat exchanger 4.

[0030] Specifically, the compression device uses a compressor. When alternating current is passed through the compressor's coil 7, a changing magnetic field is generated, which drives the mover magnet to move the piston 9 back and forth, generating acoustic power and pressure fluctuations. The interior of the machine is filled with high-pressure helium gas. The acoustic power and pressure fluctuations push the exhaust device 11 through the helium gas, and after being phased by the exhaust device 11, they enter the first chamber 12.

[0031] Specifically, the elastic element 13 can be placed in front (e.g., Figure 1 As shown), it can also be placed later (as shown). Figure 2 As shown, it combines with the discharger 11 to perform pressure wave phase modulation, increasing effective acoustic power. The elastic element 13 is a leaf spring, with one end fixed and the other end connected to the discharger 11, providing restoring force for the discharger 11. In the free piston 9 heat pump, the phase modulation function of the discharger 11 is achieved by regulating the phase difference between the working fluid pressure wave and the displacement wave of the discharger 11 (and piston 9), thereby matching the cyclic thermodynamic process and maximizing the system's energy conversion efficiency. The discharger 11, through its own inertia, elasticity, and damping characteristics, changes the flow sequence of the working fluid between the compression chamber (i.e., the third chamber 3) and the expansion chamber (i.e., the second chamber 5), so that the working fluid is concentrated on the high-temperature side (compression chamber) during the isothermal compression stage and on the low-temperature side (expansion chamber) during the isothermal expansion stage, ensuring that heat is effectively released on the high-temperature side and effectively absorbed on the low-temperature side, avoiding heat loss caused by disordered flow of the working fluid between the chambers.

[0032] Specifically, the first cavity 12 is an empty cavity that receives the pressure wave and volumetric flow rate wave after being phased by the discharger 11 and transmits them to the third cavity 3 to prepare for "heat pumping".

[0033] Specifically, the first heat exchanger 1 adopts the structure of a tubular heat exchanger. Its tube bundle is the heat output component of the heat pump. Its tube walls are welded and fixed to the outer shell of the heat pump unit at both ends. Its internal fluid is high-temperature and high-pressure helium working fluid. Its external fluid is a heat receiving device or heat transport device connected to the heat pump. Its heat exchange working fluid depends on the actual operating conditions.

[0034] Specifically, the regenerator 2 is filled with a material such as wire mesh or silk floss that has properties similar to porous media through an interference fit, and it serves as the main component for consuming acoustic energy. After the acoustic energy flows through the regenerator 2, it is rapidly consumed and a temperature gradient is formed at its two ends. The temperature rises rapidly from the end of the second heat exchanger 4 to the end of the first heat exchanger 1 according to a certain gradient.

[0035] Specifically, the third cavity 3 is an empty cavity that functions as a thermal buffer tube. It acts as a buffer space before the pressure fluctuations and volumetric flow rates pumped from the gaseous working fluid in the first cavity 12 enter the high-resistance component, the regenerator 2. This buffer space balances the gas vibration state, reduces turbulence effects, and thus minimizes energy loss caused by the gas jet. The thermal buffer tube in this embodiment should be interpreted broadly; any structure that allows for the interchange of the high-temperature heat exchanger (first heat exchanger 1) and the room-temperature heat exchanger (second heat exchanger 4) by changing the energy flow path is within the scope of this patent.

[0036] Specifically, the second heat exchanger 4 is composed of a tube bundle, which is evenly distributed within a heat exchange space enclosed by an outer wall. The tube bundle is connected to the regenerator 2 and the second cavity 5, which contains a high-pressure helium working fluid. The two ends of the heat exchange space are connected to independent water-cooling units or chiller units that provide circulating cooling water, which exchanges heat through the tube bundle walls to achieve the effect of cooling the helium working fluid inside the tubes.

[0037] Specifically, the second cavity 5 is an empty cavity that is directly connected to the second heat exchanger 4. As an intermediate flow link, it transmits the remaining acoustic energy after the acoustic energy of the regenerator 2 is greatly consumed to the exhaust device 11 for recovery and re-entering the next cycle. At the same time, it continues to exchange heat with the room temperature environment through the wall.

[0038] In existing linear compressors, the motor relies on the electromagnetic induction of the stator windings to drive the rotor's reciprocating motion. If the temperature at this point is too high, the copper losses in the stator windings will increase exponentially with rising temperature, further exacerbating winding heating and creating a "thermal runaway" cycle. Simultaneously, high temperatures reduce the remanence and coercivity of the permanent magnets. If the temperature exceeds the Curie temperature of the permanent magnets, irreversible demagnetization will occur, directly leading to a decrease in motor output thrust, a lower power factor, and even the inability to drive the piston 9 to maintain its designed stroke.

[0039] It is understood that the first heat exchanger 1 is filled with a high-temperature, high-pressure gaseous working fluid, typically high-temperature, high-pressure helium, making it a high-temperature heat exchanger. The second heat exchanger 4 is filled with a high-pressure, low-temperature gaseous working fluid, typically high-pressure, low-temperature helium, making it a room-temperature heat exchanger. This invention uses a third cavity 3 as a heat buffer tube structure to change the energy flow path and reduce heat transfer loss, swapping the positions of the first heat exchanger 1 (high-temperature heat exchanger) and the second heat exchanger 4 (room-temperature heat exchanger), thus moving the high-temperature side away from the compression device. This structural optimization concentrates the high-temperature side at the top of the equipment for output, establishing a smoother and more stable temperature gradient. Furthermore, by moving the high-temperature side away from the motor, springs, and other mechanical components of the compression device, it avoids thermal deformation and plastic deformation caused by high temperatures, ensuring the performance of the permanent magnet, improving the efficiency of the heat pump, and extending its operational stability and service life.

[0040] This invention provides a thermoacoustic heat pump system, comprising: a compressor, a discharge unit 11, a first heat exchanger 1, a regenerator 2, and a second heat exchanger 4. The compressor generates acoustic power and pressure fluctuations; the discharge unit 11 moves in response to the acoustic power and pressure fluctuations generated by the compressor, and a first cavity 12 is formed inside the discharge unit 11, while a second cavity 5 is formed between the discharge unit 11 and the compressor; the first heat exchanger 1 is filled with a high-temperature, high-pressure gaseous working fluid; the regenerator 2 is connected to the first heat exchanger 1 and converts acoustic power into pumping heat, and a third cavity 3 is provided inside the regenerator 2, which is connected to both the first heat exchanger 1 and the first cavity 12; the second heat exchanger 4 is connected to the regenerator 2 and the second cavity 5. The first heat exchanger 1 is positioned further away from the compressor than the second heat exchanger 4. The present invention provides a thermoacoustic heat pump system that changes the energy flow path by setting a third cavity 3, swapping the positions of the first heat exchanger 1 and the second heat exchanger 4, moving the high-temperature side away from the compression device, ensuring heat pump efficiency and operational stability, and extending service life.

[0041] by Figure 1 Taking the illustrated embodiment as an example, the working method of the thermoacoustic heat pump system of the present invention is as follows: The external excitation power source is the coil 7 of the compression device, which, after passing alternating current, generates a changing magnetic field. This drives the mover magnet to move the piston 9 back and forth, producing pressure and volumetric flow rate fluctuations, thus generating acoustic power. The machine body is filled with high-pressure helium. The pressure and volumetric flow rate fluctuations push the exhaust device 11 through the helium gas. After being phased by the exhaust device 11, the acoustic power enters the first cavity 12. Subsequently, the acoustic power sequentially enters the third cavity 3, the first heat exchanger 1, the regenerator 2, the second heat exchanger 4, and the second cavity 5. During this process, the acoustic power is continuously consumed (i.e., the amplitude of the pressure and volumetric flow rate fluctuations continuously decreases, and the phase continuously changes). Its function is to pump the heat from the second cavity 5 through the second cavity 5, the second heat exchanger 4, the regenerator 2, and the first heat exchanger 1 to the first heat exchanger 1, which is generally in contact with the heat exchange medium, and then transfers the heat to the heat-using equipment again, completing the entire heat pumping process.

[0042] In one embodiment of the present invention, the first heat exchanger 1 is a U-tube heat exchanger, with one end connected to the third cavity 3 and the other end connected to the regenerator 2. Specifically, the U-tube heat exchanger is located at the top of the thermoacoustic heat pump system, with one end of its tube side connected to the third cavity 3 and the other end connected to the regenerator 2.

[0043] In one embodiment of the present invention, the second heat exchanger 4 is a tube bundle heat exchanger. The tube bundle heat exchanger forms a heat exchange space by being enclosed by its outer wall, and multiple tube bundles are arranged within the heat exchange space. At least some of the tube bundles are connected between the regenerator 2 and the second cavity 5. Specifically, the tube bundle heat exchanger is located below the regenerator 2, and is closer to the compression device than a U-tube heat exchanger. The tube side of the tube bundle heat exchanger is composed of multiple tube bundles, with one end of each tube bundle connected to the regenerator 2 and the other end connected to the second cavity 5.

[0044] In one embodiment of the present invention, at least a portion of the tube bundle is connected between the third cavity 3 and the first cavity 12. In this embodiment, the tube bundle portion of the second heat exchanger 4 fills the space between the third cavity 3 and the first cavity 12 to stabilize the temperature gradient within the third cavity 3. The structure in this embodiment is as follows: Figure 1 As shown, the third cavity 3 has a larger volume and a larger contact area with the regenerator 2. Therefore, the tube bundle of the second heat exchanger 4 is used for cooling, thereby reducing the temperature of the entire first cavity 12 plus the third cavity 3, reducing heat exchange with the regenerator 2, ensuring the temperature gradient inside the regenerator 2, and thus further improving the pump heat efficiency.

[0045] In one embodiment of the present invention, the first cavity 12 is a tapered tube structure, with the larger end of the tapered tube structure's inner diameter close to the compression cavity and the smaller end of the tapered tube structure close to the discharger 11. The structure of this embodiment is as follows: Figure 3 As shown, it is similar to Figure 1 The operating principle of the structure shown is the same, but compared to Figure 1 The structure shown in this embodiment tightens the diameter of the third cavity 3, eliminates the heat dissipation structure (i.e., the second heat exchanger 4) within the third cavity 3, and adjusts the first cavity 12 into a form similar to a tapered tube structure. This structure can enhance the amplitude of pressure fluctuations, making the pressure fluctuations within the third cavity 3 more intense, and significantly enhancing the heat exchange efficiency between the tube wall and the second heat exchanger 4. Therefore, this part of the heat exchange tube can be removed, thereby reducing flow losses and enhancing energy transfer. Specifically, in this embodiment, the third cavity 3 is smaller, and the third cavity 3 passes through the second heat exchanger 4 and directly connects to the first cavity 12. That is, the tube side of the second heat exchanger 4 is located on the outside of the third cavity 3, and no tube side of the second heat exchanger 4 is located between the third cavity 3 and the first cavity 12. It can be understood that the end of the first cavity 12 connected to the compression chamber is the larger end, and the other end is the smaller end, thus forming a tapered tube structure.

[0046] In one embodiment of the invention, multiple compression devices are provided and are arranged in an opposing configuration at the bottom of the second heat exchanger 4. For example... Figures 1 to 3As shown, both adopt a opposed structure. It can be understood that the compression device is set in opposition, and the discharger 11 is also set in opposition. By setting the compression device and the discharger 11 in opposition, both cost and system vibration are reduced.

[0047] In one embodiment of the present invention, the compression device includes an outer stator 6, an inner stator 8, a coil 7, and a piston 9. The inner stator 8 is disposed inside the outer stator 6; the coil 7 is connected to an external excitation power supply and is disposed between the outer stator 6 and the inner stator 8; the piston 9 is movably disposed inside the inner stator 8 and reciprocates through the alternating magnetic field generated by the coil 7. One side of the piston 9 forms a second cavity 5 with the outer side of the discharge device 11, and the other side of the piston 9 has a fourth cavity 10.

[0048] Specifically, the outer stator 6 and inner stator 8 are rigidly fixed in a ring shape to the compressor housing. The coil 7 is connected to an external excitation power supply, which provides alternating current, generating an alternating magnetic field in the coil 7. This magnetic field drives the piston 9 to reciprocate, thus producing pressure fluctuations and volumetric flow rate fluctuations. The phase of these two fluctuations is adjusted by the discharge device 11, thereby transferring sufficient acoustic power to the heat pump unit for "heat pumping". The fourth chamber 10 serves as the back chamber of the compression device. It is a closed gas chamber on the back of the piston 9. It is a cavity and a key structure for the stable and efficient operation of the entire machine. Its function is equivalent to a flexible gas spring, providing restoring force to the piston 9, replacing the traditional mechanical spring, which simplifies the structure and improves its lifespan.

[0049] In one embodiment of the invention, the thermoacoustic heat pump system further includes an elastic element 13 connected to the exhaust device 11, providing an elastic restoring force to the exhaust device 11. Preferably, the elastic element 13 is a leaf spring, with one end fixed and the other end connected to the exhaust device 11.

[0050] In one embodiment of the present invention, the thermoacoustic heat pump system further includes: a fixed bracket 14 disposed near the first cavity 12, one end of an elastic member 13 connected to the fixed bracket 14, and the other end of the elastic member 13 connected to the exhaust device 11. This embodiment employs a front-mounted structure for the elastic member 13, i.e. Figure 1 The structure shown fixes the elastic element 13 near the first cavity 12.

[0051] In one embodiment of the present invention, the elastic element 13 is disposed within the fourth cavity 10; the thermoacoustic heat pump system further includes a connecting rod 15, one end of which is connected to the elastic element 13, and the other end of which passes through the piston 9 and is connected to the discharge device 11. This embodiment adopts a rear-mounted structure for the elastic element 13, i.e. Figure 2The structure shown places the elastic element 13 within the fourth cavity 10 (back cavity) and connects it to the exhaust device 11 via a connecting rod 15. The basic operating mechanism of this embodiment is exactly the same as the previous embodiment, except that the elastic element 13 is placed in the back cavity of the compression device and connected to the exhaust device 11 via a longer connecting rod 15. The advantages of this embodiment are that it simplifies the complexity of gas flow at the exhaust device 11 and improves the efficiency of sound power transmission; furthermore, placing the elastic element 13 within the back cavity allows for the use of a larger leaf spring, which can withstand greater pressure fluctuations and helps improve the overall power of the heat pump.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermoacoustic heat pump system, characterized in that, include: Compression device used to generate acoustic power and pressure fluctuations; The discharge device moves in response to acoustic power and pressure fluctuations generated by the compression device, and a first cavity is formed inside the discharge device, and a second cavity is formed between the discharge device and the compression device on the outside of the discharge device. The first heat exchanger is used to fill a high-temperature, high-pressure gaseous working fluid; A regenerator, connected to the first heat exchanger, is used to convert acoustic power into pumping heat, and a third cavity is provided inside the regenerator, which is connected to the first heat exchanger and the first cavity respectively. The second heat exchanger is connected to the regenerator and the second cavity; The first heat exchanger is positioned further away from the compression device than the second heat exchanger.

2. The thermoacoustic heat pump system according to claim 1, characterized in that, The first heat exchanger is a U-tube heat exchanger, with one end connected to the third cavity and the other end connected to the regenerator.

3. The thermoacoustic heat pump system according to claim 1, characterized in that, The second heat exchanger is a tube bundle heat exchanger, which forms a heat exchange space by being enclosed by an outer wall, and a plurality of tube bundles are arranged in the heat exchange space, at least some of the tube bundles being connected between the regenerator and the second cavity.

4. The thermoacoustic heat pump system according to claim 3, characterized in that, At least a portion of the tubing is connected between the third cavity and the first cavity.

5. The thermoacoustic heat pump system according to claim 3, characterized in that, The first cavity is a tapered tube structure, with the larger end of the tapered tube structure close to the third cavity and the smaller end of the tapered tube structure close to the discharge device.

6. The thermoacoustic heat pump system according to any one of claims 1 to 5, characterized in that, Multiple compression devices are provided and are arranged in a opposed manner at the bottom of the second heat exchanger.

7. The thermoacoustic heat pump system according to claim 6, characterized in that, The compression device includes: Outer stator; The inner stator is located inside the outer stator; A coil is connected to an external excitation power supply and is located between the outer stator and the inner stator; The piston is movably disposed inside the inner stator and reciprocates through the alternating magnetic field generated by the coil; The piston has a second cavity formed on one side and the outer side of the discharge device, and a fourth cavity on the other side.

8. The thermoacoustic heat pump system according to claim 7, characterized in that, Also includes: An elastic element, connected to the discharge device, provides elastic restoring force to the discharge device.

9. The thermoacoustic heat pump system according to claim 8, characterized in that, Also includes: A fixed bracket is disposed near the first cavity, one end of the elastic element is connected to the fixed bracket, and the other end of the elastic element is connected to the discharge device.

10. The thermoacoustic heat pump system according to claim 8, characterized in that, The elastic element is disposed within the fourth cavity; The thermoacoustic heat pump system also includes: A connecting rod, one end of which is connected to the elastic element, and the other end of which passes through the piston and is connected to the discharge device.

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