Opposed free piston thermoacoustic Stirling power generation system

Abstract

The invention relates to the technical field of power generation, and provides an opposed free piston thermoacoustic Stirling power generation system which comprises a heat exchange component and two free piston thermoacoustic Stirling generators. The free piston thermo-acoustic Stirling generator comprises a shell, a first side of the shell is provided with a first chamber and a second chamber, the first chamber is located in the middle of the shell, and the second chamber is located on one side of the first chamber; a discharger is arranged in the first chamber, and an expansion cavity is formed by the discharger and the edge of the first chamber; a heat regenerator and a cold end heat exchanger are arranged in the second chamber, and a heat regeneration cavity is formed by the heat regenerator and the edge of the second chamber; and the expansion cavities and the heat regeneration cavities of the two free piston thermoacoustic Stirling generators are communicated with each other through the heat exchange component. According to the embodiment of the invention, the heat regenerator and the cold-end heat exchanger are separated and biased relative to the discharger, and the expansion cavity of the free piston thermoacoustic Stirling generator on one side and the heat regeneration cavity of the free piston thermoacoustic Stirling generator on the other side are connected through the heat exchange component, so that heat source arrangement in one direction can be realized, and the heat source arrangement mode is simple; and meanwhile, various heat source types of solid and fluid medium heat conduction are adapted.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and particularly to a opposed free-piston thermoacoustic Stirling power generation system. Background Art

[0002] A free-piston thermoacoustic Stirling generator is an external combustion engine with wide heat source adaptability, high intrinsic efficiency, compact structure, and good quietness and reliability. Therefore, it has received much attention in a wide range of fields such as cogeneration, distributed energy, and portable power supplies.

[0003] In the prior art, an opposed thermoacoustic Stirling generator is formed by arranging two free-piston thermoacoustic Stirling generators facing each other. The hot-end heat exchangers of the two are connected and the expansion chambers are shared, and the moving parts move synchronously in opposite directions. However, for a thermoacoustic Stirling generator with axis rotational symmetry, due to the conventional arrangement method with axis helical symmetry, the supply of an external heat source and the arrangement of heat exchangers are restricted within the cylindrical space between the two thermoacoustic Stirling generators, thereby restricting the input direction of the external heat source. A method of circumferentially arranging multiple modules needs to be adopted, and the heating structure of this circumferential heating method is relatively complex. Summary of the Invention

[0004] The present invention provides an opposed free-piston thermoacoustic Stirling power generation system to solve the defect of relatively complex heating structure in the prior art.

[0005] The present invention provides an opposed free-piston thermoacoustic Stirling power generation system, including a heat exchange component and two free-piston thermoacoustic Stirling generators;

[0006] The free-piston thermoacoustic Stirling generator includes a housing. A first chamber and a second chamber are formed on the first side of the housing. The first chamber is located in the middle of the housing, and the second chamber is located on one side of the first chamber. A displacer is arranged in the first chamber, and an expansion chamber is formed between the displacer and the edge of the first chamber. A regenerator and a cold-end heat exchanger are arranged in the second chamber, and a regenerative chamber is formed between the regenerator and the edge of the second chamber;

[0007] The expansion chamber of one of the free-piston thermoacoustic Stirling generators is communicated with the regenerative chamber of the other free-piston thermoacoustic Stirling generator through the heat exchange component.

[0008] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, the two free-piston thermoacoustic Stirling generators are arranged centrosymmetrically.

[0009] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, the heat exchange component includes a first heat exchange pipeline and a second heat exchange pipeline. The expansion chamber of one of the free-piston thermoacoustic Stirling generators is communicated with the regenerator chamber of the other free-piston thermoacoustic Stirling generator through the first heat exchange pipeline, and the regenerator chamber of one of the free-piston thermoacoustic Stirling generators is communicated with the expansion chamber of the other free-piston thermoacoustic Stirling generator through the second heat exchange pipeline.

[0010] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, the heat exchange component further includes a balance pipe, and the first heat exchange pipeline is communicated with the second heat exchange pipeline through the balance pipe.

[0011] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, the first heat exchange pipeline includes a plurality of first heat exchange tubes, and the second heat exchange pipeline includes a plurality of second heat exchange tubes;

[0012] The plurality of first heat exchange tubes and the plurality of second heat exchange tubes are arranged in parallel at intervals.

[0013] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, the heat exchange component further includes a heat conducting block. The first heat exchange pipeline and the second heat exchange pipeline pass through the heat conducting block, and the heat conducting block is provided with a plurality of straight heat pipes.

[0014] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, at least one of the spaces between adjacent first heat exchange tubes, between adjacent second heat exchange tubes, and between the first heat exchange tubes and the second heat exchange tubes is provided with the straight heat pipes.

[0015] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, the first heat exchange tube intersects the straight heat pipe in a different plane.

[0016] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, the first heat exchange tube includes an outer tube and a plurality of inner tubes arranged inside the outer tube.

[0017] According to an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention, a power piston and a motor are arranged on the second side of the housing. The power piston and the motor are coaxially arranged. One end of the displacer away from the heat exchange component is connected with a displacer rod, and the displacer rod passes through the middle of the power piston and is connected with a planar leaf spring inside the housing.

[0018] The opposed free-piston thermoacoustic Stirling power generation system provided by the embodiments of the present invention realizes the separation and offset of the regenerator and the cold-end heat exchanger relative to the displacer by placing the displacer in the first chamber, the regenerator and the cold-end heat exchanger in the second chamber, and by arranging the second chamber on one side of the first chamber. By connecting the expansion chamber of a free-piston thermoacoustic Stirling generator on one side and the regenerative chamber of a free-piston thermoacoustic Stirling generator on the other side through a heat exchange component, a heat source arrangement in one direction can be achieved, so that the heat source arrangement method is simple, and at the same time, it is suitable for various heat source types with heat conduction of solid and fluid media. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 FIG. 9 is a top view structural schematic diagram of an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention;

[0021] Figure 2 FIG. 13 is a side view structural schematic diagram of an opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention;

[0022] Figure 3 FIG. 17 is a structural schematic diagram of a first heat exchange tube provided by an embodiment of the present invention.

[0023] Figure 4 FIG. 21 is a top view structural schematic diagram of another opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention;

[0024] Figure 5 FIG. 25 is a side view structural schematic diagram of another opposed free-piston thermoacoustic Stirling power generation system provided by an embodiment of the present invention.

[0025] REFERENCE NUMERALS:

[0026] 1. Free-piston thermoacoustic Stirling generator; 11. Housing; 101. Expansion chamber; 102. Regenerative chamber; 103. Compression chamber; 12. Displacer; 13. Regenerator; 14. Cold-end heat exchanger; 15. Power piston; 16. Motor; 17. Displacer rod; 18. Planar leaf spring

[0027] 2. Heat exchange component; 201. 1# first heat exchange tube group; 202. 2# first heat exchange tube group; 203. 1# second heat exchange tube group; 204. 2# second heat exchange tube group; 21. First heat exchange pipeline; 211. First heat exchange tube; 2111. Outer tube; 2112. Inner tube; 22. Second heat exchange pipeline; 23. Balance tube; 24. Heat conduction block; 25. Straight heat pipe. Detailed implementation manners

[0028] The following further describes the implementation manners of the present invention in detail in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0029] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0031] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0032] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0033] The following combines Figures 1 - 5 to describe the opposed free-piston thermoacoustic Stirling power generation system of the embodiments of the present invention.

[0034] The embodiments of the present invention propose an opposed free-piston thermoacoustic Stirling power generation system, as Figure 1 and Figure 3 shown. The opposed free-piston thermoacoustic Stirling power generation system includes a heat exchange component 2 and two free-piston thermoacoustic Stirling generators 1.

[0035] Among them, the free-piston thermoacoustic Stirling generator 1 includes a housing 11 and a displacer 12, a regenerator 13, and a cold-end heat exchanger 14 disposed inside the housing 11. A first chamber and a second chamber are constructed on the first side of the housing 11. The first chamber is located in the middle of the housing 11, and the second chamber is located on one side of the first chamber; the displacer 12 is arranged in the first chamber, and an expansion chamber 101 is formed between the displacer 12 and the edge of the first chamber; the regenerator 13 and the cold-end heat exchanger 14 are arranged in the second chamber, and a regenerative chamber 102 is formed between the regenerator 13 and the edge of the second chamber; the expansion chambers 101 and the regenerative chambers 102 of the two free-piston thermoacoustic Stirling generators 1 are interconnected through the heat exchange component 2.

[0036] It can be understood that there are two protruding parts on one side of the housing 11, and each protruding part forms a chamber communicating with the inside of the housing 11, so that two chambers are formed on one side of the housing 11, namely the first chamber located in the middle of one side of the housing 11 and the second chamber located on one side of the first chamber.

[0037] The displacer 12 is arranged in the first chamber. The displacer 12 is hermetically arranged in the first chamber, and the displacer 12 can reciprocate linearly along the side wall of the first chamber. An expansion chamber 101 is formed between the displacer 12 and the wall surface of the edge of the first chamber.

[0038] The regenerator 13 and the cold-end heat exchanger 14 are arranged in the second chamber in sequence, and a regenerative chamber 102 is formed between the regenerator 13 and the wall surface of the edge of the second chamber.

[0039] Two free-piston thermoacoustic Stirling generators 1 are respectively arranged on both sides of the heat exchange component 2. The expansion chamber 101 of one free-piston thermoacoustic Stirling generator 1 and the regenerator chamber 102 of the other free-piston thermoacoustic Stirling generator 1 are interconnected through the heat exchange component 2. The regenerator chamber 102 of one free-piston thermoacoustic Stirling generator 1 and the expansion chamber 101 of the other free-piston thermoacoustic Stirling generator 1 are interconnected through the heat exchange component 2.

[0040] It can be understood that between the two free-piston thermoacoustic Stirling generators 1, the regenerator chamber 102 is connected to the expansion chamber 101. The regenerator chamber 102 is not a circular ring structure. The regenerator chamber 102 adopts an independent cavity located on one side of the expansion chamber 101. Therefore, the heat exchange component 2 connecting the regenerator chamber 102 and the expansion chamber 101 is not arranged in a circumferential manner. A one-way connection between the regenerator chamber 102 and the expansion chamber 101 is adopted, so that the heat exchange component 2 can achieve the heat source arrangement in one direction.

[0041] In the opposed free-piston thermoacoustic Stirling power generation system provided by the embodiment of the present invention, by placing the displacer 12 in the first chamber, the regenerator 13 and the cold-end heat exchanger 14 in the second chamber, and by arranging the second chamber on one side of the first chamber, the separation offset of the regenerator 13 and the cold-end heat exchanger 14 relative to the displacer 12 is achieved. By connecting the expansion chamber 101 of one free-piston thermoacoustic Stirling generator 1 and the regenerator chamber 102 of the other free-piston thermoacoustic Stirling generator 1 through the heat exchange component 2, the heat source arrangement in one direction can be achieved, and thus the heat source arrangement method is simple.

[0042] According to the embodiment of the present invention, a power piston 15 and a motor 16 are arranged on the second side of the housing 11. The power piston 15 and the motor 16 are coaxially arranged. One end of the displacer 12 far from the heat exchange component 2 is connected with a displacer rod 17. The displacer rod 17 passes through the middle of the power piston 15 and is connected with a planar leaf spring 18 in the housing 11. The motors 16 of the two free-piston thermoacoustic Stirling generators 1 are coaxially arranged.

[0043] It can be understood that a motor 16, a power piston 15 and a planar leaf spring 18 are arranged on the other side of the housing 11. The motor 16 and the power piston 15 are concentrically arranged. The planar leaf spring 18 is connected to the side wall of the housing 11 and is located on the side of the power piston 15 far from the displacer 12.

[0044] Specifically, the motor 16 is arranged on the side wall of the housing 11. The motor 16 adopts a linear motor and is used to convert acoustic power into electrical energy for output. The power piston 15 coaxially penetrates through the inside of the motor. The displacer 12 is connected with a displacer rod 17. The displacer rod 17 passes through the power piston 15 and then is connected with the planar leaf spring 18. A compression chamber 103 is formed between the displacer 12 and the power piston 15.

[0045] It can be understood that the power piston 15 and the motor 16 are concentrically arranged, and the power piston 15 is coaxial with the ejector 12. Thus, the power piston 15, the motor 16, and the ejector 12 are coaxially arranged. In the free piston thermoacoustic Stirling generator 1, the power piston 15 and the ejector 12 are moving components, and the moving components can ensure being on the same axis.

[0046] It should be noted that a magnetic member is connected to the power piston 15 and is located between the outer stator and the rotor of the motor 16. During the movement of the power piston 15, the magnetic induction lines are cut to generate electric energy, so the motor 16 serves as a power generation mechanism.

[0047] The motors 16 of two free piston thermoacoustic Stirling generators 1 are coaxially arranged, that is, the moving components of two free piston thermoacoustic Stirling generators 1 are coaxially arranged. The moving components of two free piston thermoacoustic Stirling generators 1 remain on the same axis. When the moving components of two free piston thermoacoustic Stirling generators 1 move synchronously in opposite directions, the vibrations can be mutually cancelled.

[0048] The opposed free piston thermoacoustic Stirling power generation system provided by the embodiment of the present invention can make the two sets of ejectors 12 and power pistons 15 move synchronously in opposite directions respectively through two free piston thermoacoustic Stirling generators 1 arranged in opposition, thereby cancelling the vibrations generated by the moving components, effectively improving the quietness and specific power, and enhancing the stability of the system.

[0049] Furthermore, two free piston thermoacoustic Stirling generators 1 are arranged on both sides of the heat exchange component 2 in a centrosymmetric manner.

[0050] It can be understood that two free piston thermoacoustic Stirling generators 1 are arranged on both sides of the heat exchange component 2, and the moving components of two free piston thermoacoustic Stirling generators 1 remain on the same axis. Then the first chambers of two free piston thermoacoustic Stirling generators 1 are coaxially arranged. In the case that two free piston thermoacoustic Stirling generators 1 adopt a centrosymmetric manner, the two second chambers can be evenly distributed outside the first chamber, thus ensuring the stability of the overall structure of the system.

[0051] In an embodiment of the present invention, as Figure 2 and Figure 3 shown, the heat exchange component 2 includes a first heat exchange pipeline 21 and a second heat exchange pipeline 22. The expansion chamber 101 of one free piston thermoacoustic Stirling generator 1 is connected to the regenerator chamber 102 of the other free piston thermoacoustic Stirling generator 1 through the first heat exchange pipeline 21, and the regenerator chamber 102 of one free piston thermoacoustic Stirling generator 1 is connected to the expansion chamber 101 of the other free piston thermoacoustic Stirling generator 1 through the second heat exchange pipeline 22.

[0052] It can be understood that the expansion chamber 101 and the regenerator chamber 102 of the two free-piston thermoacoustic Stirling generators 1 are connected through pipelines.

[0053] In the embodiment of the present invention, the two free-piston thermoacoustic Stirling generators 1 are respectively the first free-piston thermoacoustic Stirling generator 1 and the second free-piston thermoacoustic Stirling generator 1. The heat exchange component 2 is arranged between the first free-piston thermoacoustic Stirling generator 1 and the second free-piston thermoacoustic Stirling generator 1. The heat exchange component 2 includes a first heat exchange pipeline 21 and a second heat exchange pipeline 22. One end of the first heat exchange pipeline 21 is connected to the expansion chamber 101 of the first free-piston thermoacoustic Stirling generator 1, and the other end of the first heat exchange pipeline 21 is connected to the regenerator chamber 102 of the second free-piston thermoacoustic Stirling generator 1; one end of the second heat exchange pipeline 22 is connected to the regenerator chamber 102 of the second free-piston thermoacoustic Stirling generator 1, and the other end of the second heat exchange pipeline 22 is connected to the expansion chamber 101 of the second free-piston thermoacoustic Stirling generator 1.

[0054] In an embodiment of the present invention, the first heat exchange pipeline 21 and the second heat exchange pipeline 22 can adopt a straight pipe structure. In order to improve the heat transfer efficiency, the first heat exchange pipeline 21 includes a plurality of first heat exchange tubes 211, and the second heat exchange pipeline 22 includes a plurality of second heat exchange tubes.

[0055] It can be understood that the plurality of first heat exchange tubes 211 are arranged in parallel at intervals, and the plurality of second heat exchange tubes are arranged in parallel at intervals.

[0056] In this embodiment, the plurality of first heat exchange tubes 211 form a plurality of first heat exchange tube groups, and the plurality of first heat exchange tube groups are arranged in sequence along the first direction. Each first heat exchange tube group includes a plurality of first heat exchange tubes 211 arranged side by side along the second direction. Here, the first direction is the radial direction of the housing 11, that is Figure 1 the up and down direction shown; the second direction is the direction perpendicular to the first direction and the axis direction of the housing 11, that is Figure 2 the up and down direction shown;

[0057] The plurality of second heat exchange tubes also form a plurality of second heat exchange tube groups, and the plurality of second heat exchange tube groups are arranged in sequence along the first direction. Each second heat exchange tube group includes a plurality of second heat exchange tubes arranged side by side along the second direction.

[0058] It should be noted that the number of the first heat exchange tubes 211 in the plurality of first heat exchange tube groups can be the same or different. Of course, the number of the second heat exchange tubes in the plurality of second heat exchange tube groups can be the same or different. Preferably, the number of the first heat exchange tubes 211 in the plurality of first heat exchange tube groups is the same, and the number of the second heat exchange tubes in the plurality of second heat exchange tube groups is the same.

[0059] The number of the first heat exchange tube groups and the number of the second heat exchange tube groups may be the same or different. Preferably, the number of the first heat exchange tube groups is the same as the number of the second heat exchange tube groups.

[0060] For example, Figure 1 as shown, the first heat exchange pipeline 21 includes two first heat exchange tube groups, namely the 1# first heat exchange tube group 201 and the 2# first heat exchange tube group 202. As Figure 2 shown, each first heat exchange tube group includes 4 first heat exchange tubes 211.

[0061] As Figure 1 shown, the second heat exchange pipeline 22 includes two second heat exchange tube groups, namely the 1# second heat exchange tube group 203 and the 2# second heat exchange tube group 204, and each second heat exchange tube group includes 4 second heat exchange tubes.

[0062] Furthermore, the first heat exchange tubes 211 of each first heat exchange tube group are arranged at equal intervals, and the multiple first heat exchange tube groups are arranged at equal intervals, so that all the first heat exchange tubes 211 are arranged in a matrix.

[0063] The second heat exchange tubes of each second heat exchange tube group are arranged at equal intervals, and the multiple second heat exchange tube groups are arranged at equal intervals, so that all the second heat exchange tubes are arranged in a matrix.

[0064] It should be noted that the number and arrangement mode of the pipelines of the first heat exchange pipeline 21 and the second heat exchange pipeline 22 may be the same or different. Preferably, the first heat exchange pipeline 21 and the second heat exchange pipeline 22 adopt the same number and arrangement mode, so that all the first heat exchange tubes 211 and all the second heat exchange tubes are arranged in a matrix as a whole.

[0065] It should be noted that in the prior art, when heat transfer adopts a circumferential arrangement mode of multiple modules, it is difficult to ensure the uniformity of heat transfer. In the opposed free-piston thermoacoustic Stirling power generation system provided by the embodiments of the present invention, through the matrix arrangement of the first heat exchange tubes 211 of the first heat exchange pipeline 21 and the second heat exchange tubes of the second heat exchange pipeline 22, the heat source arrangement in a single direction can be realized, and the uniformity of heat transfer can be ensured.

[0066] The two free-piston thermoacoustic Stirling generators 1 of the present application are connected by pipelines, which can ensure the uniformity of heat transfer while having the characteristics of simple and compact structure.

[0067] In an embodiment of the present invention, as Figure 3 shown, the first heat exchange tube 211 includes an outer tube 2111 and a plurality of inner tubes 2112 arranged inside the outer tube 2111.

[0068] It can be understood that the first heat exchange tube 211 adopts a tube-in-tube structure, which includes an outer tube 2111 and a plurality of inner tubes 2112. In this embodiment, it is shown that seven inner tubes 2112 are arranged in the outer tube 2111.

[0069] The assembly process of the first heat exchange tube 211 is as follows: after applying solder to the outer surface of the inner tube 2112, it is placed in the outer tube 2111 in the Figure 3 shown arrangement. After the line contact between the inner wall surface of the outer tube 2111 and the outer wall surface of the inner tube 2112 is strengthened to surface contact by extrusion, the tube bundle is heated at high temperature to melt the solder for welding, realizing the fixed connection between the outer tube 2111 and the inner tube 2112.

[0070] It should be noted that since the internal and external heat exchange areas of the existing shell-and-tube heat exchanger are close, but the external is phase change heat transfer or convective heat transfer with high-temperature radiation, and the temperature of the internal working gas is low and there is no phase change effect, the insufficient heat transfer efficiency on the inner side is an important reason for the low heat transfer efficiency. In the opposed free-piston thermoacoustic Stirling power generation system provided by the embodiment of the present invention, a plurality of inner tubes 2112 are arranged in the outer tube 2111, and the plurality of inner tubes 2112 can effectively increase the internal gas-solid heat exchange area of the tube in a compact space, improving the heat transfer efficiency. At the same time, the first heat exchange tube 211 in this embodiment is simple to manufacture, significantly improving the problems of large welding difficulty and many welding points of the conventional shell-and-tube heat exchanger tubes.

[0071] It should be noted that the second heat exchange tube can adopt the same structure as the first heat exchange tube 211.

[0072] In an embodiment of the present invention, the heat exchange component 2 further includes a balance tube 23, and the first heat exchange pipeline 21 is connected to the second heat exchange pipeline 22 through the balance tube 23.

[0073] It can be understood that the heat exchange component 2 includes a first heat exchange pipeline 21 and a second heat exchange pipeline 22. The first heat exchange pipeline 21 connects the expansion cavity 101 of the first free-piston thermoacoustic Stirling generator 1 and the regenerator cavity 102 of the second free-piston thermoacoustic Stirling generator 1, and the second heat exchange pipeline 22 connects the regenerator cavity 102 of the first free-piston thermoacoustic Stirling generator 1 and the expansion cavity 101 of the second free-piston thermoacoustic Stirling generator 1.

[0074] In order to avoid the non-equilibrium state of the cavities (compression cavity 103) inside the two free-piston thermoacoustic Stirling generators 1 during the operation of the system, a balance tube 23 is provided between the first heat exchange pipeline 21 and the second heat exchange pipeline 22.

[0075] In this embodiment, the center line of the balance pipe 23 is parallel to the first direction, and the balance pipe 23 connects the first pipe heat pipe and the second heat exchange pipe. For example, in the case where the first heat exchange pipeline 21 includes the 1# first heat exchange pipe group 201 and the 2# first heat exchange pipe group 202, and the second heat exchange pipeline 22 includes the 1# second heat exchange pipe group 203 and the 2# second heat exchange pipe group 204, the balance pipe 23 connects the four pipe groups. That is, one first heat exchange pipe 211 in the 1# first heat exchange pipe group 201, one first heat exchange pipe 211 in the 2# first heat exchange pipe group 202, one second heat exchange pipe in the 1# second heat exchange pipe group 203, and one second heat exchange pipe in the 2# second heat exchange pipe group 204 are sequentially connected through the balance pipe 23 along the first direction.

[0076] In the opposed free piston thermoacoustic Stirling power generation system provided by the embodiment of the present invention, a balance pipe 23 is connected between the first heat exchange pipeline 21 and the second heat exchange pipeline 22, which avoids the unbalanced state of the two free piston thermoacoustic Stirling generators 1, thereby improving the consistency and reliability of the operation of the free piston thermoacoustic Stirling generators 1 on both sides.

[0077] In the embodiment of the present invention, as Figure 1 and Figure 2 shown, the heat-carrying fluid such as combustion high-temperature flue gas, high-temperature liquid metal, high-temperature molten salt, etc. can be directly supplied along the Figure 2 shown A direction, and a simple external heat source arrangement can be achieved.

[0078] It should be noted that the existing opposed free piston thermoacoustic Stirling power generation system uses an annular burner to provide heat, and the burner has a complex structure and a large volume. However, in the opposed free piston thermoacoustic Stirling power generation system provided by the embodiment of the present invention, by directly supplying the heat-carrying fluid to the heat exchange component 2, and the heat exchange component 2 includes a plurality of first heat exchange pipes 211 arranged at intervals and a plurality of second heat exchange pipes arranged at intervals, a simple external heat source arrangement in a single direction can be achieved, uniform heat transfer of the heat-carrying fluid, and the uniformity of heat transfer can be ensured.

[0079] In another embodiment of the present invention, as Figure 4 and Figure 5 shown, the heat exchange component 2 further includes a heat conduction block 24, the first heat exchange pipeline 21 and the second heat exchange pipeline 22 pass through the heat conduction block 24, and a plurality of straight heat pipes 25 are arranged on the heat conduction block 24.

[0080] It can be understood that the heat exchange component 2 includes a heat conduction block 24, the first heat exchange pipe 211 and the second heat exchange pipe both pass through the heat conduction block 24, and are connected between the expansion cavity 101 and the regenerator cavity 102, and straight heat pipes 25 are also arranged on the heat conduction block 24.

[0081] The condensation end of the straight heat pipe 25 is arranged in the heat conducting block 24. The hot end of the straight heat pipe 25 is connected to the heat source. The heat of the heat source is transferred to the condensation end of the straight heat pipe 25 through the hot end of the straight heat pipe 25. The condensation end of the straight heat pipe 25 transfers the heat to the heat conducting block 24, and the heat conducting block 24 transfers the heat to the heat exchange pipes (the first heat exchange pipe 211 and the second heat exchange pipe), so as to achieve efficient heat transfer of the straight heat pipe 25 - heat conducting block 24 - heat exchange pipe - working gas (the inner cavity of the free piston thermoacoustic Stirling generator 1).

[0082] In the opposed free piston thermoacoustic Stirling power generation system provided by the embodiment of the present invention, through the cooperation of the heat conducting block 24 and the straight heat pipe 25 with the heat exchange pipelines (the first heat exchange pipeline 21 and the second heat exchange pipeline 22), the heat transfer of the fixed heat source can be realized.

[0083] In the opposed free piston thermoacoustic Stirling power generation system provided by the embodiment of the present invention, the regenerator 13 and the cold end heat exchanger 14 are arranged outside the displacer 12, so as to realize the separation and offset of the regenerator 13 and the cold end heat exchanger 14. The regenerator 13 of the free piston thermoacoustic Stirling generator 1 on one side is connected to the expansion chamber 101 of the free piston thermoacoustic Stirling generator 1 on the other side through a straight pipe. The two machines are arranged in central symmetry, and the moving parts still remain on the same axis. While ensuring the cancellation of vibration, a more compact and simpler heat source arrangement in one direction can be realized, which has the characteristics of uniformity, compactness and simplicity, and can adapt to various heat transfer forms of external heat sources such as heat-carrying fluids and solid heat sources.

[0084] In the embodiment of the present invention, the straight heat pipe 25 is arranged between the pipelines of the first heat exchange pipeline 21 and the second heat exchange pipeline 22. The straight heat pipe 25 adopts a straight pipe, and the heat conducting block 24 adopts a metal heat conducting block 24. The straight heat pipe 25 is fixed through the metal heat conducting block 24 provided with a straight heat pipe groove. The condensation end of the straight heat pipe 25 is fixed in the straight heat pipe groove. The heat exchangers (the first heat exchange pipe 211 and the second heat exchange pipe) are connected to the heat conducting block 24 by welding to realize efficient heat transfer of the straight heat pipe 25 - heat conducting block 24 - heat exchanger - working gas. Moreover, the straight heat pipe 25 adopts a straight pipe, so that the heat conduction radius is small and the heat conduction efficiency is high.

[0085] In the embodiment of the present invention, there are multiple straight heat pipes 25. The straight heat pipe 25 can be arranged between adjacent first heat exchange pipes 211, or between adjacent second heat exchange pipes, or between the first heat exchange pipe 211 and the second heat exchange pipeline 22.

[0086] Preferably, multiple straight heat pipes 25 are arranged between adjacent first heat exchange pipe groups, between adjacent second heat exchange pipe groups, and between the first heat exchange pipe group and the second heat exchange pipe group.

[0087] Exemplarily, the heat exchange component 2 includes a 1# first heat exchange tube group 201, a 2# first heat exchange tube group 202, a 1# second heat exchange tube group 203, and a 2# second heat exchange tube group 204 arranged in sequence along the first direction. Then, a plurality of straight heat pipes 25 are arranged in the area between the 1# first heat exchange tube group 201 and the 2# first heat exchange tube group 202, and the plurality of straight heat pipes 25 are arranged at equal intervals. A plurality of straight heat pipes 25 are arranged in the area between the 2# first heat exchange tube group and the 1# second heat exchange tube group 203, and the plurality of straight heat pipes 25 are arranged at equal intervals. A plurality of straight heat pipes 25 are arranged in the area between the 1# second heat exchange tube group 203 and the 2# second heat exchange tube group 204, and the plurality of straight heat pipes 25 are arranged at equal intervals. Preferably, all the straight heat pipes 25 are arranged in a matrix.

[0088] It should be noted that when the heat exchange component 2 includes one first heat exchange tube group and one second heat exchange tube group, a plurality of straight heat pipes 25 are arranged between the first heat exchange tube group and the second heat exchange tube group. When the heat exchange component 2 includes more (such as three or four) first heat exchange tube groups and more second heat exchange tube groups, a plurality of straight heat pipes 25 are arranged between every two adjacent first heat exchange tube groups and every two adjacent second heat exchange tube groups.

[0089] In the embodiment of the present invention, the first heat exchange pipeline 21 intersects the straight heat pipe 25 in a skew manner. Of course, the second heat exchange pipeline 22 is arranged parallel to the first heat exchange pipeline 21, so the second heat exchange pipeline 22 also intersects the straight heat pipe 25 in a skew manner.

[0090] Preferably, taking the first heat exchange pipeline 21 as an example, the axis of the straight heat pipe 25 is perpendicular to the plane where the first heat exchange tube 211 is located along the first direction to improve the heat transfer efficiency.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An opposed free piston thermoacoustic Stirling power generation system, characterized in that: It comprises a heat exchange component (2) and two free piston thermoacoustic Stirling generators (1); The free piston thermoacoustic Stirling generator (1) comprises a shell (11), wherein a first chamber and a second chamber are constructed on a first side of the shell (11), wherein the first chamber is located in the middle of the shell (11), and the second chamber is located on one side of the first chamber; the first chamber is provided with an ejector (12), wherein the ejector (12) and the edge of the first chamber form an expansion chamber (101); the second chamber is provided with a regenerator (13) and a cold end heat exchanger (14), wherein the regenerator (13) and the edge of the second chamber form a regenerative chamber (102); The expansion chamber (101) of one of the free piston thermoacoustic Stirling generators (1) is communicated with the regenerative chamber (102) of the other free piston thermoacoustic Stirling generator (1) through the heat exchange component (2).

2. The opposed free-piston thermoacoustic Stirling power generation system according to claim 1, characterized in that: The two free piston thermoacoustic Stirling generators (1) are centrally symmetrically arranged.

3. The opposed free piston thermoacoustic Stirling power generation system according to claim 1, characterized in that: The heat exchange component (2) comprises a first heat exchange pipeline (21) and a second heat exchange pipeline (22), wherein the expansion chamber (101) of one of the free piston thermoacoustic Stirling generators (1) is communicated with the regenerative chamber (102) of another free piston thermoacoustic Stirling generator (1) through the first heat exchange pipeline (21), and the regenerative chamber (102) of one of the free piston thermoacoustic Stirling generators (1) is communicated with the expansion chamber (101) of another free piston thermoacoustic Stirling generator (1) through the second heat exchange pipeline (22).

4. The opposed free piston thermoacoustic Stirling power generation system according to claim 3, characterized in that: The heat exchange component (2) further comprises a balancing pipe (23), and the first heat exchange pipeline (21) is connected to the second heat exchange pipeline (22) through the balancing pipe (23).

5. The opposed free-piston thermoacoustic Stirling power generation system according to claim 3, characterized in that: The first heat exchange pipeline (21) includes a plurality of first heat exchange tubes (211), and the second heat exchange pipeline (22) includes a plurality of second heat exchange tubes; A plurality of the first heat exchange tubes (211) and a plurality of the second heat exchange tubes are arranged in parallel and at intervals.

6. The opposed free-piston thermoacoustic Stirling power generation system according to claim 5, characterized in that: The heat exchange component (2) further comprises a heat conduction block (24), the first heat exchange pipeline (21) and the second heat exchange pipeline (22) are arranged through the heat conduction block (24), and the heat conduction block (24) is provided with a plurality of straight heat pipes (25).

7. The opposed free-piston thermoacoustic Stirling power generation system according to claim 6, characterized in that: The straight heat pipe (25) is arranged at least between adjacent first heat exchange pipes (211), between adjacent second heat exchange pipes, and between the first heat exchange pipe (211) and the second heat exchange pipe.

8. The opposed free-piston thermoacoustic Stirling power generation system according to claim 7, characterized in that: The first heat exchange tube (211) and the straight heat tube (25) intersect at different planes.

9. The opposed free-piston thermoacoustic Stirling power generation system according to any one of claims 5 to 7, characterized in that: The first heat exchange tube (211) comprises an outer tube (2111) and a plurality of inner tubes (2112) arranged in the outer tube (2111).

10. The opposed free-piston thermoacoustic Stirling power generation system according to any one of claims 1 to 7, characterized in that: A power piston (15) and a motor (16) are arranged on the second side of the housing (11). The power piston (15) and the motor (16) are arranged coaxially. An ejector rod (17) is connected to one end of the ejector (12) away from the heat exchange component (2). The ejector rod (17) passes through the middle of the power piston (15) and is connected to a flat leaf spring (18) in the housing (11).

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