JP2016096614A - Thermal acoustic power generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal acoustic power generation device that can adjust the natural frequency of the system.SOLUTION: A sound pressure generator 20 of a thermal acoustic power generation device 1 has a high-temperature side heat-exchanger 24 for receiving supply of heat energy, a low-temperature side heat exchanger 26, and a stack 22 having plural channels formed therein, operating fluid running through the plural channels. A temperature gradient which is reduced in temperature from the high-temperature side heat-exchanger 24 to the low-temperature side heat-exchanger 26 is formed in the stack 22, thereby generating sound pressure in the operating fluid. A power generator 30 has a reciprocating member 33 which reciprocates upon reception of the sound pressure of the operating fluid, and converts the reciprocating motion of the reciprocating member 33 to electrical energy. The sound generator 20 and the power generator 30 are connected to each other, and a pipe 11 in which the operating fluid is filled has an expansion and contraction portion 15 which can expand and contract in the axial direction.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a thermoacoustic power generation apparatus that converts thermal energy into electrical energy using a thermoacoustic phenomenon.

  An apparatus (hereinafter referred to as a thermoacoustic power generation apparatus) that converts thermal energy into electric energy using a thermoacoustic phenomenon has been conventionally proposed. A thermoacoustic power generator typically includes a stack that converts thermal energy into acoustic energy and a generator that converts acoustic energy into electrical energy.

  Generally, the stack is composed of a high-temperature side heat exchanger (hereinafter referred to as a high-temperature side heat exchanger) that receives heat supplied from the outside and a low-temperature side heat exchanger (hereinafter referred to as a low-temperature side heat exchanger). Between the high temperature side heat exchanger and the low temperature side heat exchanger (hereinafter referred to as the axial direction). By supplying heat to the high temperature side heat exchanger to form a temperature gradient in the stack, heat exchange is performed between the stack and the working fluid, and the working fluid repeatedly expands and contracts, Causes self-excited vibration.

  In a thermoacoustic power generation device, self-excited vibration, that is, acoustic energy generated in a working fluid by heat exchange with a stack is converted into electrical energy using a transducer or the like.

JP 2008-167580 A

  In the above-described thermoacoustic power generator, the self-excited vibration of the working fluid depends on the shape and positional relationship of the pipeline, the high temperature side heat exchanger, the low temperature side heat exchanger, the stack, and the generator filled with the working fluid. Occurs at a dependent natural frequency (hereinafter referred to as "system natural frequency"). The conversion efficiency from thermal energy to acoustic energy in the stack depends on the shape of the flow path through which the working fluid flows and the frequency at which self-excited vibration occurs. In order to operate the thermoacoustic power generator, it is necessary to generate self-excited vibration at a frequency close to the natural frequency of the system while realizing high energy conversion efficiency in the stack.

  In such a thermoacoustic power generation device, for example, depending on a change in the structure and position of the generator, installation conditions of the device (for example, positional relationship with a structure to which the thermoacoustic power generation device is fixed, a fixing method, etc.) The natural frequency of the fluid may change, and the energy conversion efficiency in the stack may decrease, and the self-excited vibration may not occur in the working fluid. In order to operate the thermoacoustic power generator satisfactorily, it is necessary to cause self-excited vibration in the working fluid without reducing the energy conversion efficiency in the stack. If an optimum design is made for each thermoacoustic power generator in consideration of the installation conditions and the like, the manufacturing cost increases. In addition, optimal design cannot always be realized due to manufacturing problems such as workability. In addition, changes in installation conditions due to aging (aging of fixed structures and fixing means, etc.) may be assumed. For this reason, in the thermoacoustic power generation device, there is a demand for a technique that allows the natural frequency of the system to be adjusted without changing the stack design.

  Embodiments of the present invention have been made in view of the above circumstances, and an object thereof is to provide a thermoacoustic power generator capable of adjusting the natural frequency of a system.

  In order to achieve the above-described object, a thermoacoustic power generation device according to an embodiment of the present invention is a thermoacoustic power generation device that converts thermal energy into electrical energy using a thermoacoustic phenomenon, and is supplied with high temperature. A side heat exchanger, a low temperature side heat exchanger that is lower in temperature than the high temperature side heat exchanger, and the high temperature side heat exchanger and the low temperature side heat exchanger. A stack in which a plurality of possible passages are formed, and by forming a temperature gradient in the stack that decreases in temperature from the high temperature side heat exchanger toward the low temperature side heat exchanger, A sound pressure generating unit that generates pressure, a reciprocating member that reciprocates in response to the sound pressure of the working fluid, and a power generation unit that converts the reciprocating motion of the reciprocating member into electrical energy; and the sound pressure generating unit Is connected to the power generation unit and the working fluid inside And a pipe to be filled, the pipe is characterized by having a telescopic unit which is extensible part in the axial direction.

  A thermoacoustic power generation apparatus according to another embodiment of the present invention is a thermoacoustic power generation apparatus that converts thermal energy into electrical energy using a thermoacoustic phenomenon, and receives a supply of thermal energy. And a low temperature side heat exchanger that is at a lower temperature than the high temperature side heat exchanger, and a plurality of working fluids that are provided between the high temperature side heat exchanger and the low temperature side heat exchanger and through which the working fluid can flow. A stack having a passage formed therein, and generating a sound pressure in the working fluid by forming a temperature gradient in the stack, the temperature gradient of which decreases toward the low temperature side heat exchanger from the high temperature side heat exchanger. A sound pressure generating unit, a vibration film that vibrates in response to the sound pressure of the working fluid, and a power generation unit that converts vibration of the vibration film into electric energy, and the sound pressure generation unit and the power generation unit are connected. , Piping filled with working fluid inside, and the vibration Characterized in that it comprises between the tension varying mechanism capable of varying the tension, the.

  According to the embodiment of the present invention, the natural frequency of the system can be adjusted in the thermoacoustic power generator.

It is a longitudinal cross-sectional view which shows schematic structure of the thermoacoustic electric power generating apparatus of 1st Embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the thermoacoustic electric power generating apparatus of 2nd Embodiment. It is a fragmentary longitudinal cross-section which shows the periphery structure of a tension variable mechanism among the thermoacoustic electric power generating apparatuses of 2nd Embodiment. It is a disassembled perspective view which shows the component structure of the tension variable mechanism among the thermoacoustic electric power generating apparatuses of 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments described below, and various modifications can be made without departing from the scope of the invention.

[First Embodiment]
A thermoacoustic power generation device according to a first embodiment will be described with reference to FIG. FIG. 1 is a longitudinal sectional view showing a schematic configuration of the thermoacoustic power generation device of the present embodiment.

  As shown in FIG. 1, the thermoacoustic power generation device 1 is a device that converts thermal energy into electrical energy, and receives a supply of thermal energy to generate a sound pressure in a working fluid. The power generation unit 30 receives the sound pressure of the working fluid and converts the acoustic energy of the working fluid into electrical energy. In addition, the thermoacoustic power generation device 1 includes a pipe 11 that connects the sound pressure generation unit 20 and the power generation unit 30 and is filled with a working fluid. In the present embodiment, the pipe 11 has a cylindrical shape. For example, air can be used as the working fluid.

  In the following description, the direction from the sound pressure generating unit 20 to the power generation unit 30 in the axial direction is referred to as “axial power generation side” and is indicated by an arrow A1 in the drawing. On the other hand, the side opposite to the axial power generation side is referred to as “axially opposite side” and is indicated by an arrow A2 in the figure. The radial direction orthogonal to the axial direction is indicated by an arrow R in the figure. A pipe 10 having a substantially cylindrical shape is connected to the opposite side of the sound pressure generator 20 in the axial direction.

  The sound pressure generating unit 20 includes a high temperature side heat exchanger 24 that receives supply of heat energy from the outside, a low temperature side heat exchanger 26 that is at a lower temperature than the high temperature side heat exchanger 24, and a high temperature side heat exchanger 24. The stack 22 is provided between the low temperature side heat exchanger 26 and a temperature gradient is formed. In the present embodiment, the stack 22 has a cylindrical shape whose axial center extends in the axial direction.

  The stack 22 has a plurality of passages through which the working fluid can flow between the high temperature side heat exchanger 24 and the low temperature side heat exchanger 26. In the present embodiment, the plurality of passages formed in the stack 22 extend in parallel in the axial direction. Further, on the radially outer side of the stack 22, a member (hereinafter referred to as an outer peripheral member) 23 that surrounds the radially outer side of the stack 22 between the high temperature side heat exchanger 24 and the low temperature side heat exchanger 26, Is provided.

  In the present embodiment, on the opposite side in the axial direction of the stack 22, a high temperature side heat exchanger 24 is provided adjacent to the stack 22. On the other hand, a low temperature side heat exchanger 26 is provided adjacent to the stack 22 on the axial power generation side of the stack 22. The stack 22 is provided between the high temperature side heat exchanger 24 and the low temperature side heat exchanger 26 in the axial direction.

  The high temperature side heat exchanger 24 is configured to allow the working fluid to flow in the axial direction, and is configured to allow high temperature water (hereinafter referred to as hot water) to flow therethrough. The high temperature side heat exchanger 24 is supplied with hot water from the outside, and receives heat from the hot water to become a high temperature. Thereby, the high temperature side heat exchanger 24 receives supply of thermal energy. The high temperature side heat exchanger 24 transmits heat (heat energy) received from the hot water to the stack 22.

  A pipe 10 extending in the axial direction is coupled to the axially opposite side A <b> 2 of the high temperature side heat exchanger 24. The end 10a on the opposite side in the axial direction of the pipe 10 is closed, and the working fluid is filled on the radially inner side.

  The low temperature side heat exchanger 26 is configured so that the working fluid can flow in the axial direction, and cooling water (hereinafter referred to as cooling water) flows in the radial direction. The low temperature side heat exchanger 26 is supplied with cooling water from the outside and absorbs heat from the stack 22 to cool the stack 22. The low temperature side heat exchanger 26 transmits the heat (heat energy) transmitted from the stack 22 to the cooling water and discharges it to the outside. The temperature of the discharged cooling water is equal to or slightly higher than the outside air.

  The sound pressure generating unit 20 configured as described above supplies hot water from the outside to the high temperature side heat exchanger 24 and also supplies cooling water from the outside to the low temperature side heat exchanger 26, whereby the stack 22 is supplied. Forms a temperature gradient that becomes lower in temperature in the axial direction from the high temperature side heat exchanger 24 toward the low temperature side heat exchanger 26.

  When such a temperature gradient is formed, heat exchange is performed between the stack 22 and the working fluid in the passage, and the working fluid repeats expansion and contraction. In the working fluid, self-excited vibration is generated, and sound pressure that is a dense wave of the working fluid is generated. A value obtained by multiplying the sound pressure by the particle velocity of the working fluid is acoustic energy. In this way, the stack 22 converts a part of the thermal energy received from the high temperature side heat exchanger 24 into the acoustic energy of the working fluid.

  A pipe 11 extending in the axial direction is coupled to the axial power generation side A1 of the low temperature side heat exchanger 26. In the present embodiment, the pipe 11 is configured such that the dimension in the axial direction is larger than the dimension in the radial direction (indicated by an arrow R in the figure). A power generation unit 30 is disposed at the end 14 on the axial power generation side of the pipe 11. The space 5 inside the pipe 11 in the radial direction is filled with the working fluid, and the sound pressure (acoustic energy) generated in the sound pressure generating unit 20 is transmitted to the power generation unit 30 via the working fluid in the space 5. Is done.

  The power generation unit 30 of the present embodiment is configured as a so-called linear induction motor, and has a member 33 (hereinafter referred to as a reciprocating member) that reciprocates in the axial direction under the sound pressure of the working fluid. Yes. In the power generation unit 30 of the present embodiment, the reciprocating member 33 has a substantially columnar shape extending in the axial direction, and includes a permanent magnet (magnet). The power generation unit 30 has a coil 36 formed by winding a wire on the radially outer side of the reciprocating member 33.

  Furthermore, the power generation unit 30 of the present embodiment has a cylindrical shape extending in the axial direction between the coil 36 and the reciprocating member 33 in the radial direction, and a member around which the wire material of the coil 36 is wound (hereinafter referred to as a coil core). 35) is provided. The coil core 35 is coupled to the end 14 on the axial power generation side of the pipe 11.

  The reciprocating member 33 is configured to reciprocate in the axial direction on the radially inner side of the coil 36 and the coil core 35. The power generation unit 30 includes a base (hereinafter referred to as a magnet base) 32 that supports the reciprocating member 33 so as to be capable of reciprocating in the axial direction. The coil core 35 and the reciprocating member 33 on the radially inner side are disposed so as to face the stack 22 and the heat exchangers 24 and 26 in the axial direction, and close the opening on the axial power generation side of the pipe 11. Is arranged.

  An end surface 33a on the opposite side in the axial direction of the reciprocating member 33 faces the space 5 in the pipe 11 and receives the pressure of the working fluid. When the reciprocating member 33 receives the sound pressure of the working fluid and reciprocates, an induced current is generated in the coil 36. Thereby, the electric power generation part 30 converts the reciprocating motion of the reciprocating member 33, that is, the acoustic energy, into electric energy.

  In addition to the end 14 on the axial power generation side described above, the pipe 11 according to the present embodiment includes a portion (hereinafter referred to as a stretchable portion) 15 configured to be stretchable in the axial direction, and an axial direction from the stretchable portion 15. It has an opposite end 13. The stretchable part 15 has an annular shape extending in the circumferential direction of the pipe 11. As shown in FIG. 1, the stretchable portion 15 has a bellows-like longitudinal section, and is configured as a so-called flexible tube. By extending / contracting the expansion / contraction part 15 in the axial direction, the boundary condition on the axial power generation side of the pipe 10 regarding the self-excited vibration of the working fluid can be changed. The boundary condition can also be changed by replacing the expansion / contraction part 15 with another one and changing the axial resistance (spring constant) of the expansion / contraction part 15. The natural frequency of the system can be adjusted by changing the boundary condition on the axial power generation side regarding the self-excited vibration of the working fluid.

  In the present embodiment, in the power generation unit 30, the reciprocating member 33 including a permanent magnet receives the sound pressure of the working fluid and reciprocates radially inward of the coil 36. The power generation unit is not limited to this mode. The reciprocating member may be provided with a coil, and a permanent magnet (magnet) may be provided on the radially outer side of the reciprocating member. In addition, the thing of various aspects can be used for the aspect in which the electric power generation part which concerns on this invention converts an acoustic energy into an electrical energy.

[Second Embodiment]
A schematic configuration of the thermoacoustic power generation apparatus according to the second embodiment will be described with reference to FIG. FIG. 2 is a longitudinal sectional view showing a schematic configuration of the thermoacoustic power generation device of the present embodiment.

  The power generation unit of the present embodiment is provided with a vibrating membrane that vibrates in response to the sound pressure of the working fluid, and by changing the tension of the vibrating membrane by converting the vibration of the vibrating membrane into electrical energy, This is different from the first embodiment in that the boundary condition on the axial power generation side regarding the self-excited vibration of the working fluid is changed. In addition, about the structure substantially common to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 2, the thermoacoustic power generation device 1 </ b> C of the present embodiment includes the same sound pressure generator 20 and the pipe 10 as those of the first embodiment. A pipe 12 extending in the axial direction is coupled to the axial power generation side A1 of the low-temperature side heat exchanger 26 in the sound pressure generating unit 20. The pipe 12 is configured as a rigid body. A space 6 inside the pipe 12 in the radial direction is filled with a working fluid.

  In the thermoacoustic power generation device 1 </ b> C of the present embodiment, a power generation unit 30 </ b> C is disposed at the end of the pipe 12 on the axial power generation side. The power generation unit 30 </ b> C includes a film-like member (hereinafter simply referred to as “vibration film”) 34 that vibrates by receiving the sound pressure (self-excited vibration) of the working fluid. The sound pressure (acoustic energy) generated in the stack 22 of the sound pressure generation unit 20 is transmitted to the vibration film 34 of the power generation unit 30C via the working fluid in the space 6.

  As shown in FIG. 2, the vibration film 34 is formed of a circular member that can be elastically deformed by bending. The vibration film 34 can be configured using a synthetic resin such as a plastic film. The vibration film 34 is configured to cover the opening 12e (see FIG. 3) on the axial power generation side of the pipe 12. The vibration film 34 is bent by receiving the sound pressure of the working fluid in the space 6 and vibrates in the axial direction. The power generation unit 30C converts the vibration caused by the bending of the vibration film 34 into electric energy.

  A transducer (transducer) 38 that converts the vibration in the axial direction of the vibration film 34 into electric energy is provided on the axial power generation side of the vibration film 34. For example, a piezoelectric conversion element that converts an applied force into a voltage is used for the converter 38. In the power generation unit 30 </ b> C of the present embodiment, the converter 38 converts a force generated by the bending deformation (distortion) of the vibration film 34 into electric energy by vibration in the axial direction.

  Further, the thermoacoustic power generation device 1 </ b> C includes a mechanism 40 (hereinafter referred to as a variable tension mechanism) that can change the tension of the vibration film 34. A detailed configuration of the variable tension mechanism 40 of the present embodiment will be described with reference to FIGS. 3 and 4. FIG. 3 is a partial vertical cross-sectional view showing the peripheral structure of the tension variable mechanism in the thermoacoustic power generator of this embodiment. FIG. 4 is an exploded perspective view showing a component structure of a tension variable mechanism in the thermoacoustic power generation apparatus of the present embodiment.

  As shown in FIGS. 3 and 4, the tension variable mechanism 40 has an annular member (hereinafter simply referred to as “rim”) 41 coupled along the radially outer edge of the vibration film 34. ing. As shown in FIG. 3, the rim 41 is configured such that its inner diameter is slightly larger than the outer diameter of the pipe 12. The rim 41 is attached to the outer side in the radial direction of the pipe 12 with the vibration film 34 coupled to the inner side in the radial direction.

  In addition, the tension variable mechanism 40 has a member 43 (hereinafter referred to as a pressing ring) 43 that contacts the rim 41 and presses the rim 41 on the opposite side in the axial direction indicated by an arrow A2 in the drawing. The pressing ring 43 is attached to the outer side in the radial direction of the pipe 12 together with the rim 41. In the present embodiment, the pressing ring 43 extends in the circumferential direction along the rim 41 and has an annular shape.

  The pressing ring 43 has a portion 43e that protrudes radially outward with respect to the rim 41 and extends in a state where the holding ring 43 is attached to the outer side in the radial direction of the pipe 12 together with the rim 41. An extending through-hole 43a is formed.

  A plurality of through holes 43a are formed in the pressing ring 43, and bolts 44 are inserted into the respective through holes 43a. Each bolt 44 is formed with a male screw 44a. On the other hand, the pipe 12 is provided with a portion (hereinafter referred to as a protruding portion) 45 protruding outward in the radial direction, and the protruding portion 45 is formed with a female screw 45 a that is screwed with the male screw 44 a of the bolt 44. ing.

  As shown in FIG. 3, in the tension variable mechanism 40 configured as described above, when the male screw 44 a and the female screw 45 a are screwed together and the bolt 44 is tightened, the protruding portion 45 and the rim 41 of the pipe 12 are connected to the bolt 44. And the press ring 43 is engaged. As the bolt 44 is tightened, the rim 41 approaches the protrusion 45. As the rim 41 moves in the axial direction toward the protruding portion 45, the vibrating membrane 34 coupled to the rim 41 is pulled outward in the radial direction, and the tension increases.

  Thus, in the tension variable mechanism 40 of the present embodiment, the tension acting on the vibration film 34 can be changed by changing the tightening amount of the bolt 44. In the present embodiment, the natural frequency of the system can be adjusted by changing the boundary condition on the axial power generation side of the pipe 12 related to the self-excited vibration of the working fluid by changing the tension of the vibration film 34.

  In addition, it is also suitable to provide the expansion / contraction part 15 of 1st Embodiment in the piping 12 of 1 C of thermoacoustic generators of this embodiment. With this configuration, the natural frequency of the system can be adjusted within a wider range.

[Other Embodiments]
In each of the embodiments described above, the sound pressure generating unit 20 has the outer peripheral member 23 that surrounds the radially outer side of the stack 22, but the aspect of the sound pressure generating unit according to the present invention is limited to this. is not. The sound pressure generation unit according to the present invention may be configured by the stack 22, the high temperature side heat exchanger 24, and the low temperature side heat exchanger 26 without the outer peripheral member 23.

  Further, in each embodiment, the stack 22 has a plurality of passages through which the working fluid can flow extending in parallel in the axial direction. However, the shape of the passages is not limited to this aspect. Absent. The stack can have various forms as long as a plurality of passages through which the working fluid can flow are formed and a temperature gradient can be formed in the axial direction.

  In each of the above-described embodiments, the high-temperature side heat exchanger 24 and the low-temperature side heat exchanger 26 that constitute the sound pressure generating unit 20 that generates sound pressure in the working fluid are capable of water flowing in the radial direction. The high temperature side heat exchanger 24 receives a supply of high temperature water (hot water) compared to the low temperature side heat exchanger 26 to form a temperature gradient in the stack 22. The exchanger and the low temperature side heat exchanger are not limited to this mode. The high temperature side heat exchanger only needs to be supplied with heat energy from the outside. Moreover, the low temperature side heat exchanger should just be low temperature compared with a high temperature side heat exchanger.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1, 1C Thermoacoustic generators 5 and 6 Space 10 Piping 10a Ends 11 and 12 Pipings 13 and 14 Ends 15 Expansion and contraction part 20 Sound pressure generation part 22 Stack 23 Outer peripheral member 24 High temperature side heat exchanger (heat exchanger)
26 Low temperature side heat exchanger (heat exchanger)
30, 30C Power generation part 32 Magnet base 33 Reciprocating member 33a End face 34 Vibration film 35 Coil core 36 Coil 38 Converter 40 Tension variable mechanism 41 Rim 43 Press ring 43a Through hole 43e Part 44 Bolt 44a Male thread 45 Projection part 45a Female thread

Claims (6)

A thermoacoustic power generation device that converts thermal energy into electrical energy using a thermoacoustic phenomenon,
It is provided between the high temperature side heat exchanger that receives supply of thermal energy, the low temperature side heat exchanger that is lower in temperature than the high temperature side heat exchanger, and the high temperature side heat exchanger and the low temperature side heat exchanger. And a stack in which a plurality of passages through which the working fluid can flow are formed, and a temperature gradient is formed in the stack as the temperature decreases from the high temperature side heat exchanger toward the low temperature side heat exchanger. A sound pressure generating section for generating a sound pressure in the working fluid,
A reciprocating member that reciprocates in response to the sound pressure of the working fluid, and a power generation unit that converts the reciprocating motion of the reciprocating member into electrical energy;
A pipe that connects the sound pressure generating section and the power generation section and is filled with a working fluid;
With
The said piping has the expansion-contraction part which is a part which can be expanded-contracted to an axial direction, The thermoacoustic generator characterized by the above-mentioned. 2. The thermoacoustic power generation device according to claim 1, wherein the stretchable portion has a bellows-like longitudinal section. The reciprocating member has a substantially cylindrical shape extending in the axial direction, and includes a magnet.
The power generation unit has a coil formed by winding a wire on the radially outer side from the reciprocating member,
3. The thermoacoustic generator according to claim 1, wherein when the reciprocating member receives a sound pressure of the working fluid and reciprocates, a current is generated in the coil. The power generation unit
It is provided between the coil and the reciprocating member in the radial direction, has a cylindrical shape extending in the axial direction, and further includes a coil core around which the wire of the coil is wound,
The coil core is coupled to the end on the axial power generation side of the pipe,
The thermoacoustic generator according to claim 3, wherein the reciprocating member has an axially opposite end face facing a space radially inward of the pipe. A thermoacoustic power generation device that converts thermal energy into electrical energy using a thermoacoustic phenomenon,
It is provided between the high temperature side heat exchanger that receives supply of thermal energy, the low temperature side heat exchanger that is lower in temperature than the high temperature side heat exchanger, and the high temperature side heat exchanger and the low temperature side heat exchanger. And a stack in which a plurality of passages through which the working fluid can flow are formed, and a temperature gradient is formed in the stack as the temperature decreases from the high temperature side heat exchanger toward the low temperature side heat exchanger. A sound pressure generating section for generating a sound pressure in the working fluid,
A power generation unit that has a vibration film that vibrates in response to the sound pressure of the working fluid, and converts the vibration of the vibration film into electrical energy;
A pipe that connects the sound pressure generating section and the power generation section and is filled with a working fluid;
A variable tension mechanism capable of changing the tension of the vibrating membrane;
A thermoacoustic power generation device comprising: The tension variable mechanism is
A rim coupled along a radially outer edge of the diaphragm;
Along with the rim, it is attached to the outside of the pipe in the radial direction, and has a through hole that protrudes radially outward from the rim and extends in the axial direction. A holding ring to hold down the rim,
Protrusions provided to project radially outward from the pipe, and female threads are formed,
A male screw is formed, inserted into the through hole of the holding ring, and a bolt into which the female screw of the protrusion and the male screw are screwed together,
Have
The thermoacoustic power generation device according to claim 5, wherein when the bolt is tightened, the pressing ring and the rim move in the axially opposite side, and the tension of the vibrating membrane increases.

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