A thermoacoustically driven magnetohydrodynamic generator

Abstract

The embodiment of the present invention provides a thermoacoustic driven magnetohydrodynamic generator, comprising: a thermoacoustic engine and a magnetic fluid sealed resonator; the magnetic fluid sealed resonator comprises: a resonance tube, liquid metal and two first magnetic parts; one end of the resonance tube is connected to the thermoacoustic engine, and the resonance tube is provided with magnetic poles and electrodes and filled with the liquid metal; the two first magnetic parts are respectively installed at the two ends of the resonance tube, and the liquid level of the liquid metal is located within the magnetic lines of force of the first magnetic parts. The thermoacoustic driven magnetohydrodynamic generator provided by the present invention uses a resonance tube to load the liquid metal, and sets magnetic poles and electrodes in the resonance tube, so that the liquid metal is used as an acoustic-electric conversion device, which can reduce the process difficulty of thermoacoustic power generation, improve reliability, and solve the problems of difficulty in motor manufacturing and unstable liquid level of liquid metal magnetohydrodynamic in thermoacoustic generators.

Description

Technical Field

[0001] The invention relates to the field of thermoacoustics, and in particular to a thermoacoustic driven magnetohydrodynamic generator. Background Art

[0002] Thermoacoustic generator consists of two parts: thermoacoustic engine and linear generator. Figure 1 As shown, the thermoacoustic engine mainly includes a heater 1, a regenerator 2, and a water cooler 3. The linear generator mainly includes a piston 4, a mover 5, a permanent magnet 6, a coil 7, an inner stator 8, an outer stator 9, a cylinder 10, etc. When the temperature of the heater 1 in the thermoacoustic engine rises, the water cooler 3 maintains a certain temperature, and a temperature gradient is established in the axial direction of the regenerator 2. When the temperature gradient reaches a certain value, the gas in the system will produce self-excited oscillation, and the engine converts thermal energy into mechanical energy in the form of sound waves. The sound wave can drive the piston 4 in the linear generator to move, because the mover 5, the permanent magnet 6 and the piston 4 are fixedly connected together, so the movement of the piston 4 will also carry the mover 5 and the permanent magnet 6, thereby changing the magnetic flux in the coil 7 and converting the mechanical energy into electrical energy output. In order to improve the heat exchange performance of the engine, there can be no lubricating oil in the thermoacoustic engine, so the cylinder 10 and the piston 4 in the linear generator cannot be lubricated with lubricating oil. Therefore, the piston 4 and the mover 5 of the linear generator can only be supported by leaf springs or air floating, so a gap of 10 microns must be maintained between the piston 4 and the cylinder 10, which brings great difficulties to processing and assembly.

[0003] To solve the above problems, the existing method is to use a liquid metal magnetohydrodynamic generator coupled with a thermoacoustic engine. The liquid metal magnetohydrodynamic generator is a device that converts mechanical energy into electrical energy without any moving parts, such as Figure 2 As shown, the direction of the magnetic pole 13 is perpendicular to the paper surface. The magnetic pole 13 is arranged in one direction of the flow channel. When the conductive liquid metal 11 flows through the magnetic pole 13, a dry acoustic current will be generated in a direction perpendicular to the magnetic field. As long as the electrodes 12 are arranged on both sides of the flow channel in the direction perpendicular to the magnetic field, electrical energy can be output to the outside. If the liquid metal is placed in a U-shaped tube and the U-shaped tube is connected to a thermoacoustic engine, the sound waves generated by the thermoacoustic engine can drive the liquid metal 11 to reciprocate through the magnetic field, thereby generating electrical energy. However, since the liquid metal can flow, the entire liquid metal magnetohydrodynamic generator cannot be tilted or inverted too much. At the same time, if the liquid metal 11 moves too much, the liquid surface at both ends will be unstable and liquid separation will occur, affecting the normal operation of the liquid metal magnetohydrodynamic generator. Summary of the invention

[0004] The embodiment of the present invention provides a thermoacoustic driven magnetohydrodynamic generator, which is used to solve the problems of difficulty in motor manufacturing and unstable liquid level of liquid metal magnetohydrodynamic generator in the thermoacoustic generator.

[0005] An embodiment of the present invention provides a thermoacoustically driven magnetohydrodynamic generator, comprising:

[0006] Thermoacoustic engines and magnetic fluid sealed resonators;

[0007] The magnetic fluid sealed resonator includes: a resonance tube, liquid metal and two first magnetic parts; one end of the resonance tube is connected to the thermoacoustic engine, and the resonance tube is equipped with magnetic poles and electrodes and filled with the liquid metal; the two first magnetic parts are respectively installed at the two ends of the resonance tube, and the liquid surface of the liquid metal is located within the magnetic field line range of the first magnetic parts.

[0008] According to an embodiment of the present invention, the thermoacoustically driven magnetohydrodynamic generator, the magnetic fluid sealed resonator further comprises:

[0009] The piston is movably mounted at both ends of the resonance tube, and the piston is located on the liquid surface of the liquid metal.

[0010] According to an embodiment of the present invention, the thermoacoustically driven magnetohydrodynamic generator, the magnetic fluid sealed resonator further comprises:

[0011] A second magnetic member; the second magnetic member is mounted on the piston, and the second magnetic member is spaced apart from the inner wall surface of the resonance tube.

[0012] According to a thermoacoustically driven magnetohydrodynamic generator according to one embodiment of the present invention, the first magnetic component is installed on the outer wall of the resonance tube, the first magnetic component and the second magnetic component have opposite magnetic poles when installed, and the liquid metal is located within the range of magnetic lines of force of the first magnetic component and the second magnetic component.

[0013] According to the thermoacoustically driven magnetohydrodynamic generator of one embodiment of the present invention, the liquid metal contains magnetic nanoparticles, so that the liquid metal has certain soft magnetic properties and conductive properties.

[0014] According to the thermoacoustically driven magnetohydrodynamic generator of one embodiment of the present invention, if the resonance tube is a straight tube, the magnetic fluid sealed resonator further comprises: a fixing member, the fixing member is mounted on the resonance tube to separate the resonance tube into a first resonance tube and a second resonance tube;

[0015] The magnetic fluid sealed resonator further comprises: a connecting shaft; a bearing hole is provided on the fixing member, the connecting shaft passes through the bearing hole, and both ends of the connecting shaft are respectively connected to the piston.

[0016] According to the thermoacoustically driven magnetohydrodynamic generator of one embodiment of the present invention, the fixing member is provided with a plurality of connecting holes, and the first resonance tube is connected with the second resonance tube through the connecting holes.

[0017] According to a thermoacoustically driven magnetohydrodynamic generator according to an embodiment of the present invention, the magnetic pole is arranged in a first relative direction of the connecting hole, and the electrode is arranged in a second relative direction of the connecting hole.

[0018] According to a thermoacoustically driven magnetohydrodynamic generator of one embodiment of the present invention, the thermoacoustic engine comprises: a heat chamber, a heater, a regenerator and a water cooler connected in sequence; the heat chamber is connected to the resonance tube through the heater, the regenerator and the water cooler in sequence.

[0019] According to an embodiment of the thermoacoustic driven magnetohydrodynamic generator of the present invention, the thermoacoustic driven magnetohydrodynamic generator is divided into a plurality of groups, and the thermoacoustic driven magnetohydrodynamic generators of each group are connected end to end in sequence.

[0020] The thermoacoustic driven magnetohydrodynamic generator provided by the present invention adopts a resonance tube to fill liquid metal, and sets magnetic poles and electrodes in the resonance tube, so that the liquid metal is used as an acoustic-electric conversion device, which can reduce the process difficulty of thermoacoustic power generation, improve reliability, and solve the problems of difficulty in motor manufacturing and unstable liquid level of liquid metal magnetofluid in the thermoacoustic generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a structural schematic diagram of an existing thermoacoustic generator;

[0023] Figure 2 It is a structural schematic diagram of an existing liquid metal magnetohydrodynamic generator;

[0024] Figure 3 is a schematic structural diagram of a thermoacoustically driven magnetohydrodynamic generator provided by a first embodiment of the present invention;

[0025] Figure 4 is a schematic structural diagram of a thermoacoustically driven magnetohydrodynamic generator provided by a second embodiment of the present invention;

[0026] Figure 5 yes Figure 4 Schematic diagram of the cross section at AA in the middle;

[0027] Figure 6 is a schematic structural diagram of a thermoacoustically driven magnetohydrodynamic generator provided in a third embodiment of the present invention;

[0028] Reference numerals:

[0029] 1. Heater; 2. Regenerator; 3. Water cooler; 4. Piston; 5. Mover; 6. Permanent magnet; 7. Coil; 8. Inner stator; 9. Outer stator; 10. Cylinder; 11. Liquid metal; 12. Electrode; 13. Magnetic pole; 14. Resonance tube; 15. Second magnetic part; 16. First magnetic part; 17. Piston; 18. Fixing part; 19. Connecting shaft; 20. Connecting hole; 21. Hot chamber. DETAILED DESCRIPTION

[0030] 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.

[0031] Combine the following Figure 3 The thermoacoustic driven magnetohydrodynamic generator provided in the embodiment of the present invention is described, and the thermoacoustic driven magnetohydrodynamic generator comprises: a thermoacoustic engine and a magnetic fluid sealed resonator. The magnetic fluid sealed resonator comprises: a resonance tube 14, a liquid metal 11 and two first magnetic members 16.

[0032] In this embodiment, the resonance tube 14 is a U-shaped tube. One end of the resonance tube 14 is connected to the thermoacoustic engine. A magnetic pole 13 and an electrode 12 are installed in the resonance tube, and the resonance tube is filled with liquid metal 11. The liquid metal 11 contains magnetic nanoparticles so that the liquid metal 11 has certain soft magnetic properties and conductive properties. Two first magnetic parts 16 are respectively installed at both ends of the resonance tube 14, and the liquid surface of the liquid metal 11 is located within the magnetic field line range of the first magnetic part 16.

[0033] During operation, the thermoacoustic engine converts thermal energy into mechanical energy in the form of sound waves, which can drive the liquid metal 11 to move. When the liquid column of the liquid metal 11 reciprocates. The liquid level of the liquid metal 11 can rise and fall freely between the first magnetic member 16. The first magnetic member 16 will have an attractive effect on the liquid metal 11, preventing the droplets from detaching from the liquid surface, thereby enhancing the stability of the liquid surface, so that the liquid surface will not be unstable under large acceleration conditions. And even if detachment occurs, the droplets will be sucked back and return to the liquid column. During the flow of liquid metal 11, if the liquid metal 11 passes through the magnetic field formed by the magnetic pole 13, an induced current will be generated in the magnetic field. The electrode 12 collects the induced current in the magnetic field, which can effectively convert mechanical energy into electrical energy.

[0034] The thermoacoustic driven magnetohydrodynamic generator provided by the present invention adopts a resonance tube to fill liquid metal, and sets magnetic poles and electrodes in the resonance tube, so that the liquid metal is used as an acoustic-electric conversion device, which can reduce the process difficulty of thermoacoustic power generation, improve reliability, and solve the problems of difficulty in motor manufacturing and unstable liquid level of liquid metal magnetofluid in the thermoacoustic generator.

[0035] To further improve the stability of the liquid level, Figure 3 As shown, the magnetic fluid sealed resonator further includes a piston 17 . The piston 17 is movably mounted at both ends of the resonance tube 14 , and the piston 17 is located on the liquid surface of the liquid metal 11 .

[0036] In this embodiment, the piston 17 can also be replaced by a float. When the liquid column of the liquid metal 11 reciprocates, the float will move up and down with the liquid surface. Due to the presence of the float, the area of ​​the liquid column of the liquid metal 11 is greatly reduced, so the instability of the liquid surface is greatly reduced.

[0037] The magnetic fluid sealed resonator further includes: a second magnetic member 15. The second magnetic member 15 is mounted on the piston 17, and the second magnetic member 15 is spaced apart from the inner wall of the resonance tube 14. The first magnetic member 16 is mounted on the outer wall of the resonance tube 14, and the first magnetic member 16 and the second magnetic member 15 have opposite magnetic poles when they are mounted, and the liquid metal 11 is located within the magnetic field lines of the first magnetic member 16 and the second magnetic member 15.

[0038] When the liquid column of the liquid metal 11 reciprocates, the piston 17 will move up and down with the liquid surface. Due to the presence of the piston 17, the area of ​​the liquid column of the liquid metal 11 is greatly reduced, so the instability of the liquid surface is greatly reduced. When the amplitude of the liquid column is further increased, the liquid surface between the first magnetic member 16 will still have an unstable trend, but because of the presence of the magnetic field between the first magnetic member 16 and the second magnetic member 15, the magnetic field has an attractive effect on the liquid metal 11, preventing the droplets from leaving the liquid surface, thereby enhancing the stability of the liquid surface, causing the liquid surface to not become unstable under a large acceleration. If the magnetic field where the liquid surface is located is large enough, that is, the suction force of the first magnetic member 16 on the liquid surface is large enough, even if the liquid column of the liquid metal 11 is placed horizontally or even inverted, the liquid metal 11 will not flow out from between the magnetic poles to destroy the integrity of the liquid column.

[0039] Based on the above embodiment, in another embodiment provided by the present invention, as Figure 4 As shown, the resonance tube 14 adopts a straight conduit. The magnetic fluid sealed resonator also includes a fixing member 18. The fixing member 18 is installed on the resonance tube 14, and the fixing member 18 separates the resonance tube into a first resonance tube and a second resonance tube. The fixing member 18 can be a fixing flange.

[0040] The magnetic fluid sealed resonator also includes: a connecting shaft 19; a bearing hole is provided on the fixing member 18, the connecting shaft 19 passes through the bearing hole, and the two ends of the connecting shaft 19 are respectively connected to the piston 17. When the gas pushes the piston 17 on one side to move, the connecting shaft 19 can drive the piston 17 on the other side to perform the same movement.

[0041] Furthermore, a filling block material may be fixed on the connecting shaft 19 to reduce the filling amount of the liquid metal 11 .

[0042] like Figure 5 As shown, the fixing member 18 is provided with a plurality of connecting holes 20, and the first resonance tube is connected with the second resonance tube through the connecting holes 20. Positive and negative magnetic poles 13 are provided in the first relative direction of the connecting holes 20, so as to form a magnetic field in one direction of the connecting holes 20. Electrodes 12 are provided in the second relative direction of the connecting holes 20.

[0043] In this embodiment, the connecting hole 20 is a square hole, and the magnetic poles 13 and the electrodes 12 in the connecting hole 20 are alternately installed on the hole wall. The magnetic poles 13 form a magnetic field in the connecting hole 20. When the liquid metal 11 passes through the connecting hole 20, the induced current generated in the magnetic poles 13 is collected by the electrodes 12, and the mechanical energy of the liquid metal 11 flow can be converted into electrical energy output.

[0044] The thermoacoustic driven magnetohydrodynamic generator provided in this embodiment, during operation, the thermoacoustic engine converts thermal energy into mechanical energy in the form of sound waves, and the sound waves can drive the liquid metal 11 to move. When the pressure wave generated by the thermoacoustic engine drives the piston 17 on one side to move, the connecting shaft 19 drives the piston 17 on the other side to perform the same movement. The liquid metal 11 will flow through the connecting hole 20. During the flow of the liquid metal 11, if the liquid metal 11 passes through the magnetic field formed by the magnetic pole 13, an induced current will be generated in the magnetic field, and the electrode 12 collects the induced current in the magnetic field, which can effectively convert the mechanical energy into electrical energy.

[0045] In this embodiment, Figure 3 and Figure 4 As shown, the thermoacoustic engine comprises: a heat chamber 21, a heater 1, a regenerator 2 and a water cooler 3 connected in sequence. The heat chamber 21 is connected to the resonance tube 14 through the heater 1, the regenerator 2 and the water cooler 3 in sequence.

[0046] During operation, the temperature of the heater 1 rises, the water cooler 3 maintains a certain temperature, and a temperature gradient is established in the axial direction of the regenerator 2. When the temperature gradient reaches a certain value, the liquid metal 11 in the resonance tube 14 will produce self-excited oscillation, so that the engine converts thermal energy into mechanical energy in the form of sound waves.

[0047] To enhance the power generation of thermoacoustically driven magnetohydrodynamic generators, Figure 6As shown, the thermoacoustic driven magnetohydrodynamic generator can be divided into multiple groups, and each group of thermoacoustic driven magnetohydrodynamic generators is connected end to end in sequence. Each group of thermoacoustic driven magnetohydrodynamic generators is provided with a thermoacoustic engine and a bellows sealed resonator.

[0048] In other embodiments, the number of thermoacoustic engines and bellows-sealed resonators in each group may be adjusted according to actual needs to meet different work requirements.

[0049] In summary, the thermoacoustic driven magnetohydrodynamic generator provided by the present invention uses a resonance tube to fill liquid metal, and arranges magnetic poles and electrodes in the resonance tube, so that the liquid metal is used as an acoustic-to-electric conversion device, which can reduce the process difficulty of thermoacoustic power generation, improve reliability, and solve the problems of difficulty in motor manufacturing and unstable liquid level of liquid metal magnetofluid in thermoacoustic generators.

[0050] 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 thermoacoustically driven magnetohydrodynamic generator, characterized in that: include: Thermoacoustic engines and magnetic fluid sealed resonators; The magnetic fluid sealed resonator comprises: a piston, a resonance tube, liquid metal and two first magnetic parts; One end of the resonance tube is connected to the thermoacoustic engine, and a magnetic pole and an electrode are installed in the resonance tube, and the resonance tube is filled with the liquid metal; two first magnetic parts are respectively installed at the two ends of the resonance tube, and the liquid surface of the liquid metal is located within the magnetic field lines of the first magnetic parts; the piston is movably installed at the two ends of the resonance tube, and the piston is located on the liquid surface of the liquid metal; the liquid metal contains magnetic nanoparticles, so that the liquid metal has certain soft magnetic properties and conductive properties.

2. The thermoacoustically driven magnetohydrodynamic generator according to claim 1, characterized in that: The magnetic fluid sealed resonator also includes: A second magnetic member; the second magnetic member is mounted on the piston, and the second magnetic member is spaced apart from the inner wall surface of the resonance tube.

3. The thermoacoustically driven magnetohydrodynamic generator according to claim 2, characterized in that: The first magnetic component is installed on the outer wall of the resonance tube. The first magnetic component and the second magnetic component have opposite magnetic poles when installed. The liquid metal is located within the range of magnetic lines of force of the first magnetic component and the second magnetic component.

4. The thermoacoustically driven magnetohydrodynamic generator according to claim 1, characterized in that: If the resonance tube is a straight conduit, the magnetic fluid sealed resonator further comprises: a fixing member; the fixing member is installed on the resonance tube to separate the resonance tube into a first resonance tube and a second resonance tube; The magnetic fluid sealed resonator further comprises: a connecting shaft; a bearing hole is provided on the fixing member, the connecting shaft passes through the bearing hole, and both ends of the connecting shaft are respectively connected to the piston.

5. The thermoacoustically driven magnetohydrodynamic generator according to claim 4, characterized in that: The fixing member is provided with a plurality of communicating holes, and the first resonance tube is communicated with the second resonance tube through the communicating holes.

6. The thermoacoustically driven magnetohydrodynamic generator according to claim 5, characterized in that: The magnetic pole is arranged in a first relative direction of the communicating hole, and the electrode is arranged in a second relative direction of the communicating hole.

7. The thermoacoustically driven magnetohydrodynamic generator according to claim 1, characterized in that: The thermoacoustic engine comprises: a heat chamber, a heater, a regenerator and a water cooler which are connected in sequence; the heat chamber is connected to the resonance tube through the heater, the regenerator and the water cooler in sequence.

8. The thermoacoustically driven magnetohydrodynamic generator according to any one of claims 1 to 7, characterized in that: The thermoacoustically driven magnetohydrodynamic generators are divided into a plurality of groups, and the thermoacoustically driven magnetohydrodynamic generators in each group are connected end to end in sequence.

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