Phase modulation device and traveling wave thermoacoustic loop system

Abstract

The present application relates to thermoacoustic engine technical field, provide a kind of phase modulation device and travelling wave thermoacoustic loop system, wherein, phase modulation device includes shell, first resonant tube and second resonant tube, and the cavity is inside in shell;First resonant tube is connected to the first end of shell and partially set in cavity, and first resonant tube entrance is set to the outside of shell, and first resonant tube outlet is set in cavity and is communicated with cavity;Second resonant tube is connected to the second end of shell and partially set in cavity, and second resonant tube outlet is set to the outside of shell, and second resonant tube entrance is set in cavity and is communicated with cavity.The phase modulation device of the present application is used for the phase modulation of travelling wave thermoacoustic loop system, by partially setting first resonant tube and second resonant tube inside cavity, the volume of phase modulation device is reduced, and the compactness of phase modulation device is improved;The pressure difference between the inside and outside of the pipe wall of first resonant tube and second resonant tube located in cavity is small, and the thickness of pipe wall can be reduced, and material is saved.

Description

Technical Field

[0001] This invention relates to the field of thermoacoustic heat engine technology, and in particular to a phase-adjusting device and a traveling wave thermoacoustic loop system. Background Technology

[0002] The traveling wave thermoacoustic engine is a novel heat-work conversion device that utilizes the thermoacoustic effect to achieve the mutual conversion between thermal energy and acoustic energy. Using inert gas as the working fluid and having no moving mechanical parts, the traveling wave thermoacoustic engine has advantages such as simple structure, high reliability, and environmental friendliness.

[0003] Traveling wave thermoacoustic engine devices typically employ several traveling wave thermoacoustic engine core units connected end-to-end via a phasing structure to form a loop structure. For example... Figure 1 The image shows a traditional two-unit traveling wave thermoacoustic engine device, which includes two thermoacoustic engine core units 1′ and two phase-tuning structures 2′. Figure 1 The solid arrow in the middle indicates the direction of sound wave propagation. The phase-tuning structure 2′ includes a cavity 21′ and two resonant tubes 22′ connected to the outside of the cavity 21′ on both sides. The two resonant tubes 22′ are respectively connected to the outlet and inlet of the two thermoacoustic engine core units 1′; the resonant tubes 22′ can be equal-diameter tubes, variable-diameter tubes, or a combination of both. The phase-tuning structure 2′ is one of the important components of the traveling wave thermoacoustic engine device. Its function is to adjust the phase of the pressure fluctuation and volumetric flow rate at the outlet of one traveling wave thermoacoustic engine core unit 1′ to the phase required at the inlet of the next stage traveling wave thermoacoustic engine core unit 1′. The length and diameter of the resonant tubes 22′ of the phase-tuning structure 2′, as well as the volume and connection position of the cavity 21′, have a significant impact on the traveling wave thermoacoustic engine core unit 1′, causing changes in the frequency, pressure ratio, etc., of the traveling wave thermoacoustic engine device loop system, and sometimes even completely altering the normal operating state of the entire traveling wave thermoacoustic engine device loop system.

[0004] In the traditional phase-tuning structure 2′, the resonant tube 22′ is too long and the cavity 21′ is too large, resulting in an excessively large overall size of the phase-tuning structure 2′. In addition, the internal gas pressure of the resonant tube 22′ is relatively high, and the inside and outside of the tube wall are subjected to different pressures. The resonant tube 22′ needs to use a thick tube wall to withstand a large internal and external pressure difference, resulting in a large amount of material consumption and excessive weight of the resonant tube 22′. This makes it difficult to apply to thermally driven traveling wave thermoacoustic motor devices and related systems with small space requirements, and it cannot meet the actual application needs. Summary of the Invention

[0005] The purpose of this invention is to provide a phase modulation device and a traveling wave thermoacoustic loop system to solve the technical problems of excessively large overall size, excessive material consumption, and excessive weight of existing phase modulation structures.

[0006] To solve the above-mentioned technical problems, the present invention provides a phase adjustment device, comprising:

[0007] A housing having an internal cavity, the housing having a first end and a second end along its length;

[0008] A first resonant tube is connected to the first end of the housing and partially disposed within the cavity, with the inlet of the first resonant tube disposed outside the housing and the outlet of the first resonant tube disposed within the cavity and communicating with the cavity.

[0009] The second resonant tube is connected to the second end of the housing and partially disposed within the cavity. The outlet of the second resonant tube is disposed outside the housing, and the inlet of the second resonant tube is disposed within the cavity and communicates with the cavity.

[0010] According to a phase-tuning device provided by the present invention, at least a portion of the first resonant tube located in the cavity is a first spiral coil, and at least a portion of the second resonant tube located in the cavity is a second spiral coil.

[0011] According to a phase adjustment device provided by the present invention, the first spiral coil and the second spiral coil are cylindrical spiral coils, and the axial direction of the first spiral coil and the second spiral coil are parallel to the length direction of the cavity, and the length direction of the cavity is parallel to the length direction of the shell.

[0012] According to a phase adjustment device provided by the present invention, the outer diameter of the first spiral coil is the same as that of the second spiral coil, and the first spiral coil and the second spiral coil are arranged to be interleaved along the axial direction at least partially to form a double-layer spiral coil structure.

[0013] According to a phase-tuning device provided by the present invention, the outlet of the first resonant tube is close to the second end of the housing, and the inlet of the second resonant tube is close to the first end of the housing.

[0014] According to a phase-tuning device provided by the present invention, the cross-section of the cavity is circular or elliptical; the orientation of the outlet of the first resonant tube is tangent to the circumferential direction of the inner wall of the housing, and the orientation of the inlet of the second resonant tube is tangent to the circumferential direction of the inner wall of the housing.

[0015] According to a phase-tuning device provided by the present invention, the orientation of the outlet of the first resonant tube is opposite to the orientation of the inlet of the second resonant tube along the circumferential direction of the inner wall of the housing.

[0016] The present invention also provides a traveling wave thermoacoustic loop system, comprising:

[0017] Multiple traveling wave thermoacoustic thermoelectric units, each traveling wave thermoacoustic thermoelectric unit having a unit inlet and a unit outlet;

[0018] Multiple phase-tuning devices according to any one of the above claims, wherein the inlet of the first resonant tube is connected to the unit outlet of one traveling wave thermoacoustic thermoelectric unit, the outlet of the second resonant tube is connected to the unit inlet of another traveling wave thermoacoustic thermoelectric unit, and the multiple phase-tuning devices connect the multiple traveling wave thermoacoustic thermoelectric units end to end to form a loop structure.

[0019] According to the present invention, a traveling wave thermoacoustic loop system is provided, wherein the traveling wave thermoacoustic heat engine unit is a traveling wave thermoacoustic engine.

[0020] According to the present invention, a traveling wave thermoacoustic loop system is provided, wherein the traveling wave thermoacoustic heat engine unit is a direct-connected traveling wave thermally driven thermoacoustic refrigerator.

[0021] The phase-tuning device provided by this invention reduces the overall volume of the phase-tuning device and improves its structural compactness by placing a portion of the first and second resonant tubes inside a cavity. Furthermore, the walls of the first and second resonant tubes located inside the cavity bear the same pressure, resulting in a smaller pressure difference. Therefore, the wall thickness of the first and second resonant tubes located inside the cavity can be reduced, thereby saving materials. This solves the technical problems of excessive overall size, high material consumption, and excessive weight of existing phase-tuning structures, which is beneficial for the practical application of phase-tuning devices and related traveling wave thermoacoustic thermomechanical systems, making them more practical.

[0022] The traveling wave thermoacoustic loop system provided by this invention adopts a compact phase-tuning device, which reduces the overall volume of the phase-tuning structure and thus the overall volume of the traveling wave thermoacoustic loop system. Moreover, the resonant tube of the phase-tuning device bears the same pressure inside and outside the tube wall, which can reduce the tube wall thickness, thereby saving materials and reducing weight, thereby achieving the purpose of improving the structural compactness and practicality of the traveling wave thermoacoustic loop system. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a schematic diagram of the loop structure of a traveling wave thermoacoustic engine device in the prior art;

[0025] Figure 2 This is a cross-sectional view of the phase modulation device according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the first resonant tube and the second resonant tube according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the traveling wave thermoacoustic loop system according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a traveling wave thermoacoustic loop system according to another embodiment of the present invention.

[0029] In the picture:

[0030] 1. Phase adjustment device;

[0031] 11. Shell; 111. Cavity;

[0032] 12. First resonant tube; 121. First resonant tube inlet; 122. First resonant tube outlet; 123. First spiral coil;

[0033] 13. Second resonant tube; 131. Second resonant tube outlet; 132. Second resonant tube inlet; 133. Second spiral coil;

[0034] 2. Traveling wave thermoacoustic thermomechanical unit;

[0035] 21. Unit entrance; 22. Unit exit;

[0036] 23. Traveling wave thermoacoustic engine; 231. Engine casing; 232. Engine main cooler; 233. Engine regenerator; 234. Engine hot end heat exchanger; 235. Thermal buffer tube; 236. Engine secondary cooler;

[0037] 24. Direct-connected traveling wave thermally driven thermoacoustic refrigerator; 241. Unit housing; 242. Thermoacoustic drive unit; 243. Thermoacoustic refrigeration unit; Detailed Implementation

[0038] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "first" and "second" are used to clearly indicate product components and do not represent any substantial difference. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0040] It should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly; for example, it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention based on the specific circumstances.

[0041] like Figure 2 As shown in the figure, an embodiment of the present invention provides a phase-tuning device 1, including a housing 11, a first resonant tube 12, and a second resonant tube 13. The housing 11 has a sealed cavity 111 inside, and the housing 11 has a first end and a second end along its length. The first resonant tube 12 is connected to the first end of the housing 11 and is partially disposed in the cavity 111. The inlet 121 of the first resonant tube is disposed outside the first end of the housing 11, and the outlet 122 of the first resonant tube is disposed in the cavity 111 and communicates with the cavity 111. The second resonant tube 13 is connected to the second end of the housing 11 and is partially disposed in the cavity 111. The outlet 131 of the second resonant tube is disposed outside the second end of the housing 11, and the inlet 132 of the second resonant tube is disposed in the cavity 111 and communicates with the cavity 111.

[0042] The phase adjustment device 1 provided by the present invention is used for phase adjustment of a loop multi-unit traveling wave thermoacoustic thermoelectric system. It can adjust the phase of the pressure fluctuation and volume flow rate at the outlet of a traveling wave thermoacoustic thermoelectric unit to the phase required at the inlet of the next stage traveling wave thermoacoustic thermoelectric unit. The first resonant tube inlet 121 is used to connect to the outlet of a traveling wave thermoacoustic thermoelectric unit, and the second resonant tube outlet 131 is used to connect to the inlet of the next stage traveling wave thermoacoustic thermoelectric unit. Compared to the external connection method of the resonant tube-resonant cavity-resonant tube in the existing phase-tuning structure, the phase-tuning device 1 of the present invention can reduce the overall volume of the phase-tuning device 1 and improve the structural compactness of the phase-tuning device 1 by setting part of the tube body of the first resonant tube 12 and the second resonant tube 13 inside the cavity 111. Furthermore, the tube walls of the first resonant tube 12 and the second resonant tube 13 located in the cavity 111 are subjected to the same pressure inside and outside, and the pressure difference between the inside and outside is small. Therefore, the tube wall thickness of the first resonant tube 12 and the second resonant tube 13 located in the cavity 111 can be reduced, thereby saving materials and solving the technical problems of excessive overall size, excessive material consumption, and excessive weight of the existing phase-tuning structure. This is beneficial to the practical application of the phase-tuning device 1 and related traveling wave thermoacoustic thermomechanical systems, and is more practical.

[0043] Furthermore, such as Figure 2As shown, in this embodiment, the first resonant tube 12 is mostly disposed within the cavity 111, with only its inlet 121 extending to the outside of the first end of the housing 11; the second resonant tube 13 is mostly disposed within the cavity 111, with only its outlet 131 extending to the outside of the second end of the housing 11. By disposing of most of the tubes of the first resonant tube 12 and the second resonant tube 13 within the cavity 111, the overall volume of the phase-tuning device 1 can be further reduced, and the material consumption of the first resonant tube 12 and the second resonant tube 13 can be further reduced, thereby improving the structural compactness and practicality of the phase-tuning device 1.

[0044] Furthermore, such as Figure 2 and Figure 3 As shown, in some embodiments of the present invention, at least a portion of the first resonant tube 12 located within the cavity 111 is a first spiral coil 123, and at least a portion of the second resonant tube 13 located within the cavity 111 is a second spiral coil 133. Here, a spiral coil refers to a coil formed by winding a pipe along a spiral line. For pipes of the same length, the spiral coil structure occupies less space. By setting the first spiral coil 123 and the second spiral coil 133, the overall volume of the phase-tuning device 1 can be further reduced, further improving the structural compactness of the phase-tuning device 1.

[0045] Preferably, such as Figure 2 and Figure 3 As shown, in this embodiment, the portion of the first resonant tube 12 located within the cavity 111 is entirely composed of a first spiral coil 123, and the portion of the second resonant tube 13 located within the cavity 111 is entirely composed of a second spiral coil 133. By setting all portions of the first resonant tube 12 and the second resonant tube 13 located within the cavity 111 as spiral coils, the overall volume of the phase modulation device 1 can be further reduced, improving the structural compactness of the phase modulation device 1.

[0046] Specifically, such as Figure 2 and Figure 3 As shown, in this embodiment of the invention, the first spiral coil 123 and the second spiral coil 133 are cylindrical spiral coils, and the axial directions of the first spiral coil 123 and the second spiral coil 133 are parallel to the length direction of the cavity 111, which is parallel to the length direction of the shell 11. A cylindrical spiral coil refers to a coil formed by winding a pipe along a cylindrical helix. The cylindrical spiral coil can fully utilize the space within the cavity 111, resulting in high space utilization and further improving the structural compactness of the phase-adjusting device 1. Furthermore, it is simple to manufacture, easy to install, and highly practical.

[0047] In addition, in embodiments not shown in this invention, the first spiral coil 123 and the second spiral coil 133 may also be elliptical cylindrical spiral coils; an elliptical cylindrical spiral coil refers to a coil formed by winding a pipe along an elliptical cylindrical spiral line.

[0048] More specifically, such as Figure 2 and Figure 3 As shown, in this embodiment, the outer diameter of the first spiral coil 123 is the same as the outer diameter of the second spiral coil 133, and the first spiral coil 123 and the second spiral coil 133 are at least partially interleaved along the axial direction to form a double-layer spiral coil structure. The double-layer spiral coil structure can further reduce the space occupied by the first resonant tube 12 and the second resonant tube 13, thereby further reducing the overall volume of the phase tuning device 1 and improving the structural compactness of the phase tuning device 1.

[0049] In addition, in embodiments not shown in this invention, the portions of the first resonant tube 12 and the second resonant tube 13 located within the cavity 111 can also be bent and folded into a serpentine coil structure.

[0050] Furthermore, such as Figure 2 As shown, in an embodiment of the present invention, the first resonant tube outlet 122 is located inside the cavity 111 and near the second end of the housing 11, and the second resonant tube inlet 132 is located inside the cavity 111 and near the first end of the housing 11. By respectively setting the first resonant tube outlet 122 and the second resonant tube inlet 132 at both ends inside the cavity 111, when the phase adjustment device 1 is in use, the sound wave enters the first resonant tube 12 through the first resonant tube inlet 121, fills the cavity 111 through the first resonant tube outlet 122, then enters the second resonant tube 13 through the second resonant tube inlet 132, and finally exits through the second resonant tube outlet 131. The sound wave propagates fully inside the cavity 111, which helps to ensure the phase adjustment effect of the phase adjustment device 1.

[0051] Specifically, in an embodiment of the present invention, the first resonant tube 12 is sealed to the first end of the housing 11, and the second resonant tube 13 is sealed to the second end of the housing 11, thereby forming a sealed chamber inside the cavity 111 to prevent sound waves and airflow leakage.

[0052] Furthermore, in an embodiment of the present invention, the cross-section of the cavity 111 is circular or elliptical, and the cross-section of the cavity 111 refers to the section perpendicular to the length direction of the cavity 111; the orientation of the first resonant tube outlet 122 is tangent to the circumferential direction of the inner wall of the housing 11, and the orientation of the second resonant tube inlet 132 is tangent to the circumferential direction of the inner wall of the housing 11. By setting the orientation of the first resonant tube outlet 122 and the orientation of the second resonant tube inlet 132 to be tangential to the inner wall of the housing 11, the airflow and sound waves flow and propagate circumferentially along the inner wall of the housing 11 within the cavity 111, thereby reducing the reflection of sound waves within the cavity 111 and reducing turbulence, and thus reducing energy loss.

[0053] Specifically, in this embodiment, the shape and size of the first spiral coil 123 and the second spiral coil 133 are adapted to the shape and size of the cavity 111. That is, if the cross-section of the cavity 111 is circular, then the first spiral coil 123 and the second spiral coil 133 are cylindrical spiral coils, and the outer diameter of the cylindrical spiral coils is adapted to the inner diameter of the cavity 111; if the cross-section of the cavity 111 is elliptical, then the first spiral coil 123 and the second spiral coil 133 are elliptical cylindrical spiral coils, and the major and minor axes of the elliptical cylindrical spiral coils are adapted to the major and minor axes of the cross-section of the cavity 111.

[0054] Specifically, such as Figure 2 As shown, in this embodiment, along the circumferential direction of the inner wall of the housing 11, the orientation of the first resonant tube outlet 122 is opposite to the orientation of the second resonant tube inlet 132. That is, the second resonant tube inlet 132 and the first resonant tube outlet 122 are arranged opposite each other along the circumferential direction of the inner wall of the housing 11. After the sound wave enters the cavity 111 through the first resonant tube outlet 122, it propagates along the circumferential direction of the inner wall of the housing 11. The second resonant tube inlet 132 is opposite to the direction of sound wave propagation, which facilitates the sound wave entering the second resonant tube 13 through the second resonant tube inlet 132.

[0055] like Figure 4 and Figure 5 As shown, this embodiment of the invention also provides a traveling wave thermoacoustic loop system, including multiple traveling wave thermoacoustic heat engine units 2 and multiple phase-tuning devices 1 provided by any of the above embodiments. The traveling wave thermoacoustic heat engine unit 2 has a unit inlet 21 and a unit outlet 22; a first resonant tube inlet 121 is connected to the unit outlet 22 of one traveling wave thermoacoustic heat engine unit 2, and a second resonant tube outlet 131 is connected to the unit inlet 21 of another traveling wave thermoacoustic heat engine unit 2, so that multiple phase-tuning devices 1 connect multiple traveling wave thermoacoustic heat engine units 2 end to end to form a loop structure.

[0056] Figure 4 and Figure 5 The solid arrow in the middle indicates the direction of sound wave propagation.

[0057] In the traveling wave thermoacoustic loop system, sound waves from one traveling wave thermoacoustic heat engine unit 2 are emitted from the unit outlet 22. The sound waves enter the first resonant tube 12 through the inlet 121 of a connected phase-tuning device 1, and after passing through the first resonant tube 12, fill the cavity 111 through the outlet 122. They then enter the second resonant tube 13 through the inlet 132 and exit through the outlet 131 into another connected traveling wave thermoacoustic heat engine unit 2. Through the phase-tuning device 1, this process adjusts the pressure fluctuations and volumetric flow rate phase of the unit outlet 22 of the previous traveling wave thermoacoustic heat engine unit 2 to the required phase at the unit inlet 21 of the next traveling wave thermoacoustic heat engine unit 2.

[0058] The traveling wave thermoacoustic loop system of the present invention adopts a compact phase modulation device 1, which reduces the overall volume of the phase modulation structure and thus reduces the overall volume of the traveling wave thermoacoustic loop system. Moreover, the resonant tube of the phase modulation device 1 is subjected to the same pressure inside and outside the tube wall, which can reduce the tube wall thickness, thereby saving materials and reducing weight, thereby achieving the purpose of improving the structural compactness and practicality of the traveling wave thermoacoustic loop system.

[0059] In some embodiments of the present invention, the traveling wave thermoacoustic heat engine unit 2 is a traveling wave thermoacoustic engine 23, for example... Figure 4 A schematic diagram of the loop system of a two-unit traveling wave thermoacoustic engine is shown. The traveling wave thermoacoustic engine 23 includes an engine housing 231 and an engine main cooler 232, an engine regenerator 233, an engine hot end heat exchanger 234, a heat buffer tube 235, and an engine secondary cooler 236, which are respectively disposed in the engine housing 231. The engine main cooler 232, engine regenerator 233, engine hot end heat exchanger 234, heat buffer tube 235, and engine secondary cooler 236 are connected in sequence. The engine secondary cooler 236 is connected to the unit outlet 22, and the engine main cooler 232 is connected to the unit inlet 21.

[0060] In other embodiments of the present invention, the traveling wave thermoacoustic heat engine unit 2 is a direct-drive traveling wave thermoacoustic refrigerator 24, for example... Figure 5 A schematic diagram of a two-unit direct-connected traveling wave thermally driven thermoacoustic refrigerator system is shown. The direct-connected traveling wave thermally driven thermoacoustic refrigerator 24 includes a unit housing 241 and a thermoacoustic driving unit 242 and a thermoacoustic cooling unit 243 respectively disposed in the unit housing 241. The thermoacoustic driving unit 242 and the thermoacoustic cooling unit 243 are connected in sequence. The thermoacoustic driving unit 242 is connected to the unit inlet 21, and the thermoacoustic cooling unit 243 is connected to the unit outlet 22.

[0061] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A phase-adjusting device, characterized in that, include: A housing having an internal cavity, the housing having a first end and a second end along its length; A first resonant tube is connected to the first end of the housing and partially disposed within the cavity, with the inlet of the first resonant tube disposed outside the housing and the outlet of the first resonant tube disposed within the cavity and communicating with the cavity. The second resonant tube is connected to the second end of the housing and partially disposed in the cavity, with the outlet of the second resonant tube disposed outside the housing and the inlet of the second resonant tube disposed in the cavity and communicating with the cavity. The portion of the first resonant tube located within the cavity is a first spiral coil, and the portion of the second resonant tube located within the cavity is a second spiral coil; the outlet of the first resonant tube is close to the second end of the housing, and the inlet of the second resonant tube is close to the first end of the housing.

2. The phase-adjusting device according to claim 1, characterized in that, The first spiral coil and the second spiral coil are cylindrical spiral coils, and the axial direction of the first spiral coil and the second spiral coil are parallel to the length direction of the cavity, which is parallel to the length direction of the shell.

3. The phase-adjusting device according to claim 2, characterized in that, The outer diameter of the first spiral coil is the same as that of the second spiral coil, and the first spiral coil and the second spiral coil are arranged to be interleaved along the axial direction to form a double-layer spiral coil structure.

4. The phase-adjusting device according to claim 1, characterized in that, The cavity has a circular or elliptical cross-section; the outlet of the first resonant tube is tangent to the circumferential direction of the inner wall of the housing, and the inlet of the second resonant tube is tangent to the circumferential direction of the inner wall of the housing.

5. The phase-adjusting device according to claim 4, characterized in that, Along the circumferential direction of the inner wall of the housing, the orientation of the outlet of the first resonant tube is opposite to the orientation of the inlet of the second resonant tube.

6. A traveling wave thermoacoustic loop system, characterized in that, include: Multiple traveling wave thermoacoustic thermoelectric units, each traveling wave thermoacoustic thermoelectric unit having a unit inlet and a unit outlet; The multiple phase-tuning devices as described in any one of claims 1 to 5, wherein the inlet of the first resonant tube is connected to the unit outlet of one of the traveling wave thermoacoustic thermoelectric units, the outlet of the second resonant tube is connected to the unit inlet of another traveling wave thermoacoustic thermoelectric unit, and the multiple phase-tuning devices connect the multiple traveling wave thermoacoustic thermoelectric units end to end to form a loop structure.

7. The traveling wave thermoacoustic loop system according to claim 6, characterized in that, The traveling wave thermoacoustic engine unit is a traveling wave thermoacoustic engine.

8. The traveling wave thermoacoustic loop system according to claim 6, characterized in that, The traveling wave thermoacoustic thermoelectric unit is a direct-connected traveling wave thermoacoustic refrigeration unit.

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