A bellows sealed resonator, thermoacoustic engine and thermoacoustic refrigeration system

Abstract

The embodiment of the present invention provides a bellows-sealed resonator, a thermoacoustic engine and a thermoacoustic refrigeration system, wherein the bellows-sealed resonator comprises: a bellows, a resonant plate and a liquid; the resonant plate is installed at both ends of the bellows, and the resonant plate and the bellows form a sealed space, and the sealed space is filled with liquid. The bellows-sealed resonator provided by the present invention uses a bellows to encapsulate the liquid resonator without affecting the function of the liquid resonator, and connects the resonant plate at both ends of the bellows, and can directly drive the resonant plates at both ends to move through the gas in the tube wall of the thermoacoustic engine, effectively solving the problems of unstable liquid level and inability to flip of the liquid resonator.

Description

Technical Field

[0001] The invention relates to the field of thermoacoustics, and in particular to a bellows sealed resonator, a thermoacoustic engine and a thermoacoustic refrigeration system. Background Art

[0002] A thermoacoustic engine is an energy conversion system that converts thermal energy into mechanical energy. Figure 1 The core components mainly include heater 1, regenerator 2, water cooler 3 and resonance tube 7. When the temperature of heater 1 rises and water cooler 3 maintains a certain temperature, a temperature gradient will be established in the axial direction of regenerator 2. When the temperature gradient reaches a certain value, the gas in the system will produce self-excited oscillation, and the engine will convert thermal energy into mechanical energy in the form of sound waves. Because the thermoacoustic engine has no moving parts, it has very high reliability. At the same time, because its theoretical thermodynamic cycle efficiency is equal to that of the Carnot cycle, the thermoacoustic engine has high efficiency and good application prospects.

[0003] The resonance tube generally uses a long empty pipe. In order to make the system obtain the required operating frequency, the length of the resonance tube usually has to reach several meters or even more than ten meters. Therefore, it is very uncompact and the gas flow loss is also very large, making it difficult to apply in practice. Therefore, people propose to use a U-shaped liquid column to replace the resonance tube, such as Figure 2 . Liquid is poured into a U-shaped tube 5. The liquid has a certain mass, and the gas sealed at both ends of the liquid column has a certain elasticity, so that the system can work at a certain frequency. The mass of the liquid column is much larger than the gas in the acoustic resonance tube, so the size of the liquid resonator can be greatly reduced, and the flow loss is also greatly reduced, and the system efficiency is greatly improved. However, the liquid resonator also has certain problems. When the movement amplitude of the liquid column in the liquid resonator increases, the surface of the liquid column will become unstable, and the phenomenon of droplets detaching from the liquid column will occur, which limits the improvement of the performance of the thermoacoustic engine. The liquid column will produce a small amount of steam entering the thermoacoustic engine, which can easily reduce the heat exchange performance of the engine. At the same time, due to the fluidity of the liquid, the liquid oscillator cannot be tilted or flipped, which also greatly limits its practical application. Summary of the invention

[0004] The embodiments of the present invention provide a bellows-sealed resonator, a thermoacoustic engine and a thermoacoustic refrigeration system, which are used to solve the problems of unstable liquid surface and inability to flip of a traditional liquid resonator.

[0005] An embodiment of the present invention provides a bellows sealed resonator, comprising:

[0006] Bellows, resonant plates and liquids;

[0007] The resonance plate is installed at both ends of the bellows, and the resonance plate and the bellows form a sealed space, and the sealed space is filled with the liquid.

[0008] According to an embodiment of the present invention, the bellows sealed resonator further comprises: a fixing member; the bellows is installed in the pipe wall of the thermoacoustic engine through the fixing member; the bellows and the fixing member divide the pipe wall into two parts; the bellows comprises: a first bellows and a second bellows; the resonant plate comprises: a first resonant plate and a second resonant plate;

[0009] The first bellows is connected to the first end of the fixing member, and the first resonant plate is connected to the end of the first bellows away from the fixing member; the second bellows is connected to the second end of the fixing member, and the second resonant plate is connected to the end of the second bellows away from the fixing member.

[0010] According to an embodiment of the present invention, the bellows sealed resonator further comprises: a connecting shaft;

[0011] The fixing member is provided with a bearing hole and a connecting hole, the first bellows is connected with the second bellows through the connecting hole, the connecting shaft passes through the bearing hole, the first end of the connecting shaft is connected with the first resonant plate, and the second end of the connecting shaft is connected with the second resonant plate.

[0012] According to an embodiment of the present invention, the bellows sealed resonator further comprises: a first filling block and a second filling block;

[0013] The first end of the connecting shaft is connected to the first resonance plate through the first filling block, and the second end of the connecting shaft is connected to the second resonance plate through the second filling block.

[0014] According to the bellows sealed resonator of one embodiment of the present invention, the fixing member is a fixing flange, the resonant plate is a flat plate flange, and the bellows is a welded bellows.

[0015] An embodiment of the present invention further provides a thermoacoustic engine, comprising the above-mentioned bellows sealed resonator.

[0016] According to a thermoacoustic engine of one embodiment of the present invention, the thermoacoustic engine further comprises: a thermoacoustic engine structure; the thermoacoustic engine structure comprises: a tube wall and a first heat chamber, a first heater, a first regenerator and a first water cooler which are sequentially connected and arranged in the tube wall;

[0017] The first heat chamber is sequentially arranged through the first heater, the first heat regenerator and the first water cooler and is spaced apart from the resonance plate at the first end of the bellows.

[0018] According to a thermoacoustic engine of one embodiment of the present invention, the thermoacoustic engine comprises: a plurality of thermoacoustic engine structures and a plurality of the bellows sealed resonators;

[0019] The head and tail ends of the adjacent bellows-sealed resonators are connected through the corresponding thermoacoustic engine structure.

[0020] An embodiment of the present invention further provides a thermoacoustic refrigeration system, comprising the above-mentioned thermoacoustic engine.

[0021] The bellows sealed resonator provided by the present invention uses a bellows to encapsulate the liquid resonator without affecting the function of the liquid resonator, and connects resonance plates at both ends of the bellows. The resonance plates at both ends can be directly driven to move by the gas in the pipe wall of the thermoacoustic engine, effectively solving the problems of unstable liquid level and inability to flip of the traditional liquid resonator. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the structure of a thermoacoustic engine with an acoustic resonance tube;

[0024] Figure 2 It is a thermoacoustic engine with a U-shaped liquid resonator;

[0025] Figure 3 It is a schematic diagram of the structure of a bellows sealed resonator provided by an embodiment of the present invention;

[0026] Figure 4 is a schematic structural diagram of a bellows sealed resonator provided by another embodiment of the present invention;

[0027] Figure 5 is a schematic structural diagram of a thermoacoustic engine provided by an embodiment of the present invention;

[0028] Figure 6 is a schematic structural diagram of a thermoacoustic engine provided by another embodiment of the present invention;

[0029] Figure 7 is a schematic structural diagram of a thermoacoustic refrigeration system provided by an embodiment of the present invention;

[0030] Reference numerals:

[0031] 1. Heater; 2. Regenerator; 3. Water cooler; 5. U-tube; 6. Tube wall; 7. Resonance tube; 8. Fixing piece; 9. Connecting shaft; 10. First filling block; 11. Second filling block; 12. First heat chamber; 13. First heater; 14. First regenerator; 15. First water cooler; 16. Thermoacoustic cooling structure; 71. Bellows; 72. Resonance plate; 73. Liquid. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Combine the following Figure 3 The bellows sealed resonator provided in an embodiment of the present invention is described. The bellows sealed resonator includes: a bellows 71 , a resonant plate 72 and a liquid 73 .

[0034] The resonant sheet 72 is installed at both ends of the bellows 71, and the resonant sheet 72 and the bellows 71 form a sealed space, which is filled with liquid 73. The bellows 71 is fixed in the pipe wall 6 of the thermoacoustic engine, dividing the pipe wall 6 into two parts. The gas in the pipes on both sides of the pipe wall 6 cannot be freely connected at the fixed position.

[0035] Since the bellows 71 has good elasticity, when the gas pushes the resonant plate 72 on one side to move, the resonant plate 72 on the other side will move in the same manner since the liquid 73 is substantially incompressible. Since the liquid 73 is sealed in the bellows, even if the entire structure is overturned, the direction of the resonator will not be restricted.

[0036] The fixing member 8 can be a fixed flange, the resonance plate 72 can be a flat flange, and the bellows 71 is a welded bellows. The welded bellows is a highly bendable and retractable metal tube made by precision welding, mainly composed of two hollow diaphragms welded in concentric circles to form a diaphragm pair, and then multiple diaphragm pairs are stacked together to form a corrugated section, and then the two ends and the end plate metal are welded to form a bellows group, so that it can reciprocate with the resonance plate 72 according to external needs.

[0037] The bellows sealed resonator provided in the embodiment of the present invention uses a bellows to encapsulate the liquid resonator without affecting the function of the liquid resonator, and connects resonance plates at both ends of the bellows. The resonance plates at both ends can be directly driven to move by the gas in the pipe wall of the thermoacoustic engine, effectively solving the problems of unstable liquid level and inability to flip of the liquid resonator.

[0038] In one embodiment provided by the present invention, Figure 3 As shown, the bellows 71 includes: a first bellows and a second bellows. The resonant plate 72 includes: a first resonant plate and a second resonant plate. The first bellows is connected to the first end of the fixing member 8, and the first resonant plate is connected to the end of the first bellows away from the fixing member 8; the second bellows is connected to the second end of the fixing member 8, and the second resonant plate is connected to the end of the second bellows away from the fixing member 8.

[0039] The bellows 71 can be fixed by welding. The first bellows is welded to the first end of the fixing member 8, and the second bellows is welded to the second end of the fixing member 8. The first resonant plate is welded to the end of the first bellows away from the fixing member 8. The second resonant plate is welded to the end of the second bellows away from the fixing member 8.

[0040] Since the liquid 73 and the resonant plate 72 have a certain weight, and the bellows 71 is relatively soft, in order to reduce the influence of the gravity of the resonant plate 72 on the deformation of the bellows 71. Figure 4 As shown, the bellows sealed resonator also includes: a connecting shaft 9. The fixing member 8 is provided with a bearing hole and a connecting hole, and the first bellows is connected with the second bellows through the connecting hole, which is used to connect the liquid 73 on both sides of the fixing member 8. The connecting shaft 9 passes through the bearing hole, and the first end of the connecting shaft is connected to the first resonant plate, and the second end of the connecting shaft 9 is connected to the second resonant plate. When the gas pushes the first resonant plate to move, since the liquid 73 is basically incompressible, the first resonant plate drives the second resonant plate through the connecting shaft 9, and the second resonant plate will perform the same movement.

[0041] If the filling liquid 73 in the bellows 71 is lubricating oil, it can also play a lubricating role in the bearing hole.

[0042] Furthermore, a filling block material can be fixed on the connecting shaft 9 to reduce the filling amount of the liquid 73, so that the influence of the gravity of the liquid 73 on the deformation of the bellows 71 can also be reduced. Specifically, the bellows sealed resonator also includes: a first filling block 10 and a second filling block 11; the first end of the connecting shaft 9 is connected to the first resonant plate through the first filling block 10, and the second end of the connecting shaft 9 is connected to the second resonant plate through the second filling block 11.

[0043] Different from the above-mentioned embodiment, this embodiment uses a connecting shaft to connect the resonance plates on both sides, and a filling block is arranged on the connecting shaft, which can effectively reduce the influence of the resonance plate and liquid gravity on the deformation of the bellows.

[0044] The present invention also provides a thermoacoustic engine, such as Figure 5 As shown, the thermoacoustic engine comprises: the bellows sealed resonator. The structure of the bellows sealed resonator can be found in Figure 3 to Figure 4 The relevant text description will not be repeated here.

[0045] The thermoacoustic engine further includes: a thermoacoustic engine structure. The thermoacoustic engine structure includes: a tube wall 6 and a first heat chamber 12, a first heater 13, a first regenerator 14 and a first water cooler 15 which are sequentially connected and arranged in the tube wall 6; the first heat chamber 12 is sequentially arranged through the first heater 13, the first regenerator 14 and the first water cooler 15 and the resonance plate 72 at the first end of the bellows 71.

[0046] During operation, the temperature of the first heater 13 rises, the first water cooler 15 maintains a certain temperature, and a temperature gradient is established in the axial direction of the first regenerator 14. When the temperature gradient reaches a certain value, the liquid in the bellows 71 will produce self-excited oscillation, so that the engine converts thermal energy into mechanical energy in the form of sound waves. In addition, since the liquid 73 is sealed by the bellows 71, the vapor of the liquid 73 will not affect the heat exchange in the thermoacoustic engine.

[0047] To enhance the power of thermoacoustic engines, Figure 6 As shown, the thermoacoustic engine includes: a plurality of thermoacoustic engine structures and a plurality of bellows-sealed resonators. The ends of adjacent bellows-sealed resonators are connected through corresponding thermoacoustic engine structures. In this embodiment, each bellows-sealed resonator is connected to a thermoacoustic engine structure.

[0048] In addition, in other embodiments, the structure of the thermoacoustic engine and the number of bellows-sealed resonators can be adjusted according to actual needs to meet different working requirements.

[0049] The thermoacoustic engine provided by the embodiment of the present invention uses a bellows to encapsulate the liquid resonator, and connects resonant plates at both ends of the bellows, and can directly drive the resonant plates at both ends to move through the gas in the tube wall of the thermoacoustic engine, effectively solving the problems of unstable liquid level and inability to flip of the liquid resonator. In addition, because the liquid is sealed, the liquid vapor will not affect the heat exchange in the thermoacoustic engine.

[0050] The present invention also provides a thermoacoustic refrigeration system, such as Figure 7 As shown, the thermoacoustic refrigeration system includes the above-mentioned thermoacoustic engine. The structure of the thermoacoustic engine can be found in Figures 5 and 6The relevant text description will not be repeated here.

[0051] When working, the acoustic power generated by the thermoacoustic engine is input into the thermoacoustic refrigeration structure 16, and a temperature difference is generated between the low-temperature heat exchanger and the high-temperature heat exchanger through the thermoacoustic inverse effect.

[0052] In addition, in other embodiments, a thermoacoustic engine may be used to drive multiple thermoacoustic refrigeration structures 16. The head and tail ends of adjacent bellows sealed resonators are connected through the thermoacoustic engine structure or the thermoacoustic refrigeration structure 16. The number of thermoacoustic engine structures and thermoacoustic refrigeration structures 16 can be adjusted according to actual needs.

[0053] The thermoacoustic refrigeration system provided by the embodiment of the present invention uses a bellows to encapsulate the liquid resonator, and connects resonant plates at both ends of the bellows, which can directly drive the resonant plates at both ends to move through the gas in the tube wall of the thermoacoustic engine, effectively solving the problems of unstable liquid level and inability to flip of the liquid resonator. In addition, because the liquid is sealed, the liquid vapor will not affect the heat exchange in the thermoacoustic refrigeration system.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bellows sealed resonator, characterized in that: include: Bellows, resonant plates and liquids; The resonant plate is installed at both ends of the bellows, and the resonant plate and the bellows form a sealed space, and the sealed space is filled with the liquid; The bellows sealed resonator further comprises: a fixing member; the bellows is installed in the tube wall of the thermoacoustic engine through the fixing member; the bellows and the fixing member divide the tube wall into two parts; the bellows comprises: a first bellows and a second bellows; the resonant plate comprises: a first resonant plate and a second resonant plate; The first bellows is connected to a first end of the fixing member, and the first resonant plate is connected to an end of the first bellows away from the fixing member; the second bellows is connected to a second end of the fixing member, and the second resonant plate is connected to an end of the second bellows away from the fixing member; The bellows sealed resonator also includes: a connecting shaft; The fixing member is provided with a bearing hole and a connecting hole, the first bellows is connected with the second bellows through the connecting hole, the connecting shaft passes through the bearing hole, the first end of the connecting shaft is connected with the first resonant plate, and the second end of the connecting shaft is connected with the second resonant plate; The fixing member is a fixing flange, the resonant plate is a flat plate flange, and the bellows is a welded bellows.

2. The bellows sealed resonator according to claim 1, characterized in that: The bellows sealed resonator further comprises: a first filling block and a second filling block; The first end of the connecting shaft is connected to the first resonance plate through the first filling block, and the second end of the connecting shaft is connected to the second resonance plate through the second filling block.

3. A thermoacoustic engine, characterized in that: It comprises the bellows sealed resonator as described in any one of claims 1-2.

4. The thermoacoustic engine according to claim 3, characterized in that: The thermoacoustic engine further comprises: a thermoacoustic engine structure; the thermoacoustic engine structure comprises: a tube wall and a first heat chamber, a first heater, a first regenerator and a first water cooler which are sequentially connected and arranged in the tube wall; The first heat chamber is sequentially arranged through the first heater, the first heat regenerator and the first water cooler and is spaced apart from the resonance plate at the first end of the bellows.

5. The thermoacoustic engine according to claim 4, characterized in that: The thermoacoustic engine comprises: a plurality of thermoacoustic engine structures and a plurality of the bellows sealed resonators; The head and tail ends of the adjacent bellows-sealed resonators are connected through the corresponding thermoacoustic engine structure.

6. A thermoacoustic refrigeration system, characterized in that: Comprising a thermoacoustic engine as described in any one of claims 3-5.

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