Conversion structure, conversion device, thermoacoustic system, thermoacoustic power generation system, and thermoacoustic heat pump system

Abstract

In a structure for converting acoustic energy to kinetic energy, the objective is to reduce sliding resistance while improving sealing performance compared to conventional conversion structures equipped with tubes and pistons. [Solution] The conversion structure (20) includes a tube (21) which has a first port for connecting a motor and a second port for connecting a thermoacoustic device, The device comprises a vibrator (22) that separates the internal space (Si) of the pipe into a first space (S1) and a second space (S2), and the vibrator (22) is connected to the movable element (31) of the motor (30), and the vibrator (22) comprises a piston (222) and a seal (221) made of an elastic material that surrounds the outer edge of the piston (222).

Description

Technical Field

[0001] The present invention relates to a conversion structure between acoustic energy and kinetic energy, a conversion device between acoustic energy and electrical energy provided with the conversion structure, a thermoacoustic system provided with the conversion device, a thermoacoustic power generation system, and a thermoacoustic heat pump system.

Background Art

[0002] There is known a conversion device that converts the acoustic energy of a sound wave, which is a pressure vibration of a gas, into the kinetic energy of a mover via a piston and then converts the kinetic energy into electrical energy (for example, see the generator 20 described in FIG. 1 of Patent Document 1, the linear generator 40 described in FIG. 3 of Patent Document 2, the linear generator 50 described in FIG. 5 of Patent Document 3, etc.). Such a conversion device is sometimes called a linear generator or a linear motor because the mover performs a reciprocating motion instead of a rotational motion. Also known is a generator that converts acoustic energy into the kinetic energy of a rotational motion via a piston and a crank.

[0003] Such a device can output electrical energy with kinetic energy as an input, and can also output kinetic energy with electrical energy as an input. That is, these conversion devices function as both a generator and a power source.

[0004] In such a conversion device, as a conversion structure for mutually converting the acoustic energy of a sound wave and kinetic energy, a conversion structure in which a piston is provided in a tube is adopted. A mover of the conversion device (for example, a mover of a linear motor, a crank and a connecting rod of a rotary motor, etc.) is connected to the piston. As an example, the conversion structure of the generator 20 described in Patent Document 1 includes a cylinder 26, a piston 27, and a mover 22 as a tube, a piston, and a mover, respectively, as shown in FIG. 1 of Patent Document 1.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2003-324932 [Patent Document 2] Japanese Patent Publication No. 2018-091531 [Patent Document 3] Japanese Patent Publication No. 2019-078499 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] Incidentally, in order to improve the conversion efficiency of acoustic energy and kinetic energy, the conversion structure is required to achieve both high sealing performance and low sliding resistance.

[0007] One aspect of the present invention has been made in view of these problems, and its objective is to reduce sliding resistance while improving sealing performance in a conversion structure for acoustic energy and kinetic energy compared to a conventional conversion structure equipped with a tube and a piston. [Means for solving the problem]

[0008] To solve the above problems, a conversion structure according to one aspect of the present invention is a conversion structure comprising a tube including a first port for connecting a motor that converts kinetic energy and electrical energy, and a second port for connecting a thermoacoustic device, and a vibrator that divides the internal space of the tube into a first space located on the first port side and a second space located on the second port side, and the vibrator is connected to the movable element of the motor. Furthermore, in the conversion structure according to the first aspect of the present invention, the vibrator comprises a piston and a seal made of an elastic material that surrounds the outer edge of the piston and is in close contact with the outer edge of the piston, wherein the outer edge of the seal is in close contact with the inner wall of the tube over the entire circumference of the inner wall, and at least a part of the outer edge of the seal is fixed to the inner wall.

[0009] To solve the above problems, a conversion device according to one aspect of the present invention comprises a conversion structure according to one aspect of the present invention, and a motor connected to the first port that converts kinetic energy and electrical energy, the motor having a movable element, wherein the movable element is connected to the vibrator.

[0010] To solve the above problems, a thermoacoustic system comprising a conversion device according to one aspect of the present invention, and a thermoacoustic device connected to the second port, which converts thermal energy and acoustic energy.

[0011] To solve the above problems, the thermoacoustic power generation system according to the sixth aspect of the present invention comprises a conversion device according to the fourth aspect described above, and a thermoacoustic device connected to the second port, the thermoacoustic device having a thermoacoustic core. Furthermore, in the thermoacoustic power generation system according to the sixth aspect, the thermoacoustic core converts thermal energy into acoustic energy, the conversion structure converts the acoustic energy into kinetic energy, and the motor converts the kinetic energy into electrical energy and outputs it.

[0012] To solve the above problems, the thermoacoustic heat pump system according to the seventh aspect of the present invention comprises a conversion device according to the fourth aspect described above, and a thermoacoustic device connected to the second port, the thermoacoustic device having a thermoacoustic core. Furthermore, in the thermoacoustic heat pump system according to the seventh aspect, the motor converts electrical energy into kinetic energy, the conversion structure converts the kinetic energy into acoustic energy, and the thermoacoustic core generates a heat pump effect associated with the input acoustic energy. [Effects of the Invention]

[0013] According to one aspect of the present invention, in a structure for converting acoustic energy to kinetic energy, it is possible to reduce sliding resistance while improving sealing performance compared to a conventional conversion structure equipped with a tube and a piston.

Brief Description of the Drawings

[0014] [Figure 1] It is a schematic cross-sectional view of a conversion device according to a first embodiment of the present invention. [Figure 2] It is a schematic cross-sectional view of a conversion structure provided in the conversion device illustrated in FIG. 1. [Figure 3] It is a schematic plan view of a first modification example and a second modification example of a vibrator provided in the conversion structure illustrated in FIG. 2. [Figure 4] It is a schematic cross-sectional view of a motor provided in the conversion device illustrated in FIG. 1. [Figure 5] It is a schematic cross-sectional view of a first modification example of the motor illustrated in FIG. 4. [Figure 6] It is a schematic cross-sectional view of a second modification example of the motor illustrated in FIG. 4. [Figure 7] It is a schematic cross-sectional view of a thermoacoustic system according to a second embodiment of the present invention. The inset is a plan view of a heat exchanger. [Figure 8] It is a schematic cross-sectional view of a first modification example of the thermoacoustic system illustrated in FIG. 7. [Figure 9] It is a schematic cross-sectional view of a second modification example of the thermoacoustic system illustrated in FIG. 7. [Figure 10] It is a schematic cross-sectional view of a third modification example of the thermoacoustic system illustrated in FIG. 7. [Figure 11] It is a schematic cross-sectional view of a fourth modification example of the thermoacoustic system illustrated in FIG. 7. [Figure 12] It is a schematic cross-sectional view of a fifth modification example of the thermoacoustic system illustrated in FIG. 7. [Figure 13] It is a schematic diagram of an experimental apparatus used in an embodiment of the present invention. [Figure 14] It is a schematic diagram of an experimental apparatus used in a reference example of the present invention. [Figure 15] It is a graph showing the frequency dependence of the power generation efficiency obtained in the examples and reference examples of the present invention.

Modes for Carrying Out the Invention

[0015] [First Embodiment] A conversion device 10 according to the first embodiment of the present invention will be described with reference to Figures 1 to 6. Figure 1 is a schematic cross-sectional view of the conversion device 10. Note that Figure 1 is a cross-sectional view taken through the central axis (not shown in Figure 1) of the pipe 21, which will be described later. Figure 2 is a schematic cross-sectional view of the conversion structure 20 provided in the conversion device 10. Note that Figure 2 is a cross-sectional view taken along the line A-A' shown in Figure 1 (A-A' section). Figure 3 is a schematic plan view of the first and second modified versions of the vibrator 22. Figure 4 is a schematic cross-sectional view of the motor 30 provided in the conversion device 10. Figure 5 is a schematic cross-sectional view of motor 30A, which is the first modified version of motor 30. Figure 6 is a schematic cross-sectional view of motor 30B, which is the second modified version of motor 30.

[0016] <Converter> As shown in Figure 1, the conversion device 10 comprises a conversion structure 20 and a motor 30. Below, the conversion structure 20 will be described first, followed by the motor 30.

[0017] In one embodiment of the present invention, the motor 30 may be a linear motor in which the movable element 31 reciprocates linearly, or it may be a rotary motor in which a rotating shaft constituting a part of the movable element rotates around its central axis. Thus, the type of motor and movable element is not limited in the conversion device 10, so in Figure 1, the motor 30 is shown as a simple block, and the structure of the motor 30 and the movable element 31 is not specified. The specific structure of the motor 30 will be explained with reference to Figure 4, and the first and second modified examples will be explained with reference to Figures 5 and 6, respectively.

[0018] (Transformation structure) As shown in Figure 1, the conversion structure 20 comprises a tube 21 and a vibrator 22. Note that not only the conversion device 10, but also the conversion structure 20 is an embodiment of the present invention.

[0019] The pipe 21 is a cylindrical member with a cavity formed inside. Hereinafter, this cavity will be referred to as the internal space Si. In this embodiment, a circular pipe (round pipe) with a circular cross-sectional shape (a cross-section perpendicular to the axis along which the pipe 21 extends) is used as the pipe 21. However, the cross-sectional shape of the pipe 21 is not limited to a circle and can be selected as appropriate.

[0020] Furthermore, a cross-section perpendicular to the central axis of the pipe 21 is called a transverse section, and a cross-section passing through the said central axis is called a longitudinal section. Therefore, Figure 1 is a cross-sectional view of the conversion device 10 in its longitudinal section. The above-described definitions of transverse section and longitudinal section are common to the conversion device 10, the conversion structure 20, and the motor 30.

[0021] The pipe 21 includes a first port P1 and a second port P2. Each of the first port P1 and the second port P2 functions as either an input port or an output port. That is, (1) when the first port P1 functions as an input port, the second port P2 functions as an output port, and (2) when the second port P2 functions as an input port, the first port P1 functions as an output port. The first port P1 is a port connected to the motor 30, which will be described later. The second port P2 is a port connected to a thermoacoustic device. The thermoacoustic device will be described in the second embodiment with reference to Figures 7 to 12.

[0022] The transducer 22 is provided at a predetermined position in the tube 21, and the space Si inside the tube of the transducer 22 is divided into a first space S1 and a second space S2. The first space S1 is located on the side of the first port P1, and the second space S2 is located on the side of the second port P2. In this embodiment, the space on the right side in the state shown in Figure 1 is the first space S1, and the space on the left side in the state shown in Figure 1 is the second space S2. The second space S2 is filled with a working gas. In this embodiment, helium is used as the working gas. In addition to helium, argon, nitrogen, and mixtures thereof are also suitable as working gases.

[0023] As shown in Figure 2, the vibrator 22 is a plate-shaped member with a circular outer edge contour. In other words, the vibrator 22 is a disc-shaped member. The vibrator 22 includes a seal 221 and a piston 222.

[0024] The seal 221 is an annular member provided on the outer edge of the vibrator 22 and is made of an elastic material. In this embodiment, natural rubber is used as the elastic material constituting the seal 221. However, the elastic material constituting the seal 221 is not limited to natural rubber, and may be other rubbers such as styrene-butadiene rubber, chloroprene rubber, acrylonitrile rubber, urethane rubber, and silicone rubber. Furthermore, the elastic material is not limited to rubber, and may be a resin with a low modulus of elasticity.

[0025] As shown in Figure 2, the seal 221 surrounds the outer edge of the piston 222 and is in close contact with the outer edge of the piston 222. The outer edge of the seal 221 is in close contact with the inner wall of the pipe 21 without any gaps around its entire circumference. At least a portion of the outer edge of the seal 221 is fixed to the inner wall of the pipe 21. In this embodiment, the outer edge of the seal 221 is bonded to the inner wall without any gaps around its entire circumference. That is, in this embodiment, the entire outer edge of the seal 221 is bonded to the inner wall without any gaps around its entire circumference.

[0026] The piston 222 is a component of the vibrator 22 surrounded by the seal 221. In this embodiment, a plate-shaped member (i.e., a disc-shaped member) having a circular shape in plan view is used as the piston 222. However, the shape of the piston 222 in plan view is not limited to a circular shape and can be appropriately determined according to the shape of the cross-section of the pipe 21, etc. Also, the piston 222 is not limited to a plate-shaped member, but may be a block-shaped member. That is, the thickness of the piston 222 (length in the left-right direction in the state shown in Figure 1) is not limited and can be appropriately determined. If the shape of the piston 222 in plan view is kept constant, the mass of the piston 222 can be changed according to the thickness of the piston 222. The outer edge of the piston 222 and the inner edge of the seal 221 are fixed in close contact with each other around their entire circumference. In this embodiment, the outer edge of the piston 222 is bonded to the inner edge of the seal 221 without any gaps around its entire circumference.

[0027] The piston 222 is made of a material with a higher modulus of elasticity than the elastic body (natural rubber in this embodiment) that constitutes the seal 221. In this embodiment, an aluminum alloy is used as the material that constitutes the piston 222. However, the material that constitutes the piston 222 is not limited to an aluminum alloy, and may be a metal other than an aluminum alloy, such as stainless steel, copper, or iron. Furthermore, the material is not limited to a metal, and may be a resin or a fiber-reinforced resin (for example, carbon fiber reinforced resin).

[0028] When using acoustic energy to vibrate the transducer 22, it is preferable that the piston 222 be lightweight. That is, it is preferable that the material constituting the piston 222 has low density, and that the volume of the piston 222 is small (or thin). On the other hand, if it is desired to set the vibration frequency of the transducer 22 low due to the frequency of the sound waves or the like, it is preferable to set the weight of the piston 222 to an appropriate weight (i.e., somewhat heavy). In such cases, this can be addressed by using a material with relatively high density as the material constituting the piston 222, or by making the volume of the piston 222 relatively large (relatively thicker).

[0029] Furthermore, the method of fixing the outer edge of the seal 221 to the inner wall of the pipe 21, and the method of fixing the outer edge of the piston 222 to the inner edge of the seal 221, are not limited to adhesive bonding.

[0030] For example, another method for fixing the outer edge of the seal 221 to the inner wall of the pipe 21 is to form a groove in the inner wall and fit the outer edge of the seal 221 into the groove in the inner wall. In this case, a groove is formed along the circumferential direction of the inner wall at the position where the seal 221 of the pipe 21 is fixed, and the outer edge of the seal 221 is fitted into the groove, thereby fixing the inner wall and the outer edge of the seal in close contact around the entire circumference.

[0031] Since the seal 221 is made of an elastic material, the seal 221 can be easily fixed to the inner wall of the pipe 21 by utilizing the elasticity of the seal 221. Therefore, the conversion structure 20 can be manufactured inexpensively and easily.

[0032] Another method for fixing the outer edge of the piston 222 to the inner edge of the seal 221 is to form a groove along the circumferential direction of the inner edge of the seal 221, and then fit the outer edge of the piston 222 into the groove on the inner edge of the seal 221, thereby fixing the inner edge of the seal 221 and the outer edge of the piston 222 in close contact around their entire circumference.

[0033] In this embodiment, since the piston 222 is constructed using a plate-shaped member, the vibrator 22 can be made lighter compared to the piston described in Reference Document 1. Furthermore, with the above configuration, since the seal 221 is made of an elastic material, the piston 222 can be easily fixed to the seal 221 by utilizing the elasticity of the seal 221. Therefore, compared to the piston described in Reference Document 1, which inevitably generates sliding resistance, a vibrator with less (preferably none) sliding resistance and lighter weight can be manufactured inexpensively and easily.

[0034] The vibrator 22 is connected to the movable element 31 of the motor 30, which will be described later. More specifically, the end of the movable element 31 on the vibrator 22 side is connected to the piston 222 of the vibrator 22 (see Figure 1). In this embodiment, the end of the movable element 31 on the vibrator 22 side is made of a metal rod-shaped member. Therefore, a through hole corresponding to (or matching) the shape of the cross-section of the rod-shaped member is formed in the center of the piston 222, and the end of the rod-shaped member is inserted into the through hole to fix each of them. The shape of the piston 222 when separated from the end of the movable element 31 can be described as annular.

[0035] The method for fixing the vibrator 22 to the end of the rod-shaped member is not limited. Examples of fixing methods include screw fastening using screws and nuts, and bonding with a resin adhesive. Furthermore, if the ends of the piston 222 and the movable element 31 are both made of resin, the fixing method may be fusion bonding, or if both are made of metal, the fixing method may be welding. In this embodiment, the ends of the piston 222 and the movable element 31 are fixed to each other using screw fastening. However, the nuts used for screw fastening and the screw threads provided at the ends of the movable element 31 are not shown in Figures 1 and 2.

[0036] In the vibrator 22 of this embodiment, the outer edge of the seal 221, the inner edge of the seal 221, the outer edge of the piston 222, and the inner edge of the piston 222 (through hole formed in the center) are all circular, and each is designed to be concentric (see Figure 2). However, in one embodiment of the present invention, the shape and arrangement of the outer and inner edges of the seal 221 and the outer and inner edges of the piston 222 are not limited to the configuration shown in Figure 2, and may be configured as, for example, the first and second modified examples shown in Figure 3.

[0037] The left side of Figure 3 is a plan view of the oscillator 22A, which is a first modified example of the oscillator 22, and the right side of Figure 3 is a plan view of the oscillator 22B, which is a second modified example of the oscillator 22. The seal 221A and piston 222A of the oscillator 22A correspond to the seal 221 and piston 222 of the oscillator 22, respectively. The through hole formed in the center of the piston 222A is denoted by reference numeral 223A. These correspondences are the same for the oscillator 22B.

[0038] As shown in the left diagram of Figure 3, the outer edge of seal 221A is square, and the inner edge of seal 221A and the outer edge of piston 222A are circular. Also, as shown in the right diagram of Figure 3, the outer edge of seal 221B is circular, and the inner edge of seal 221B and the outer edge of piston 222B are regular octagons.

[0039] Furthermore, it is preferable that the shape of the seal 221 and piston 222 in the oscillator 22, when viewed from above, has multiple rotational symmetries with respect to the center (or center of gravity) of the seal 221 and piston 222 as the center of rotation. For example, the oscillator 22 shown in Figure 2 is n-fold symmetric (where n is any integer greater than or equal to 2), the oscillator 22A shown in the left diagram of Figure 3 is 4-fold symmetric, and the oscillator 22B shown in the right diagram of Figure 3 is 8-fold symmetric.

[0040] (motor) The motor 30 will be described primarily with reference to Figure 4. The motor 30 is a so-called moving magnet type linear motor in which a permanent magnet 313, which constitutes part of the movable element 31 described later, periodically reciprocates (i.e., behaves as a harmonic oscillator). Figure 4 is a schematic cross-sectional view of the motor 30.

[0041] As shown in Figures 1 and 4, the motor 30 is connected to the first port P1 of the pipe 21. In this embodiment, the motor 30 is housed inside the first space S1 of the pipe 21. However, in one embodiment of the present invention, the portion of the pipe 21 on the motor 30 side (the portion of the pipe 21 to the right of the vibrator 22 shown in Figure 1) may be shorter than the length of the motor 30 (the length of the motor 30 in a direction parallel to the central axis of the pipe 21). That is, a portion of the motor 30 may protrude from the first space S1.

[0042] Furthermore, in this embodiment, the end of the pipe 21 on the motor 30 side (the right end of the pipe 21 shown in Figure 1) is open. That is, in the pipe 21, the first space S1 is not sealed, and the first space S1 is in communication with the external space of the pipe 21. However, in one embodiment of the present invention, a bottom surface may be provided at the right end of the pipe 21, and the first space S1 may be sealed. Also, in one embodiment of the present invention, the end of the pipe 21 on the motor 30 side extends in a direction away from the motor 30 (to the right in Figures 1 and 4), and another thermoacoustic device can be connected to the extended end.

[0043] Motor 30 is an example of a motor that converts kinetic energy and electrical energy, and is an example of a motor (i.e., a linear motor) that converts the kinetic energy associated with the reciprocating motion of the movable element 31, which will be described later, into electrical energy. Motor 30 is configured similarly to the linear generator 40 described in Figure 3 of Patent Document 2. Therefore, here we will only show the correspondence between the parts of motor 30 and the linear generator 40 described in Patent Document 2, and will briefly explain motor 30. In the following, the linear generator 40 described in Patent Document 2 will also be referred to as the prior art invention.

[0044] As shown in Figure 4, the motor 30 comprises a movable element 31, a first yoke 32, and a coil 33. Also as shown in Figure 4, the movable element 31 comprises a shaft 311, a second yoke 312, and a permanent magnet 313.

[0045] The shaft 311 is a rod-shaped member that constitutes the end of the movable element 31 on the vibrator 22 side. In this embodiment, metal is used as the material constituting the shaft 311, similar to the piston 222 of the vibrator 22. However, the material is not limited to metal and may be resin or fiber-reinforced resin (for example, carbon fiber reinforced resin). In this respect as well, the shaft 311 is the same as the piston 222. One end of the shaft 311 is connected to the piston 222 of the vibrator 22 (see Figure 1), and the other end is connected to the second yoke 312 of the motor 30 (see Figure 4). In this embodiment, the piston 222 and the shaft 311 are molded as separate members, but the piston 222 and the shaft 311 can also be molded as an integrated member. The movable element 31 corresponds to the movable element 46 of the prior art invention.

[0046] The second yoke 312 and the permanent magnet 313 each correspond to the inner yoke 44 and permanent magnet 45 of the prior art invention, respectively. The second yoke 312 and the permanent magnet 313 each reciprocate together with the piston 222 and the shaft 311 in accordance with the reciprocating motion of the piston 222 and the shaft 311. In this embodiment, the side of the permanent magnet 313 closer to the second yoke 312 is designated as the south pole 3131, and the side of the permanent magnet 313 further from the second yoke 312 is designated as the north pole 3132.

[0047] Each of the first yoke 32 and coil 33 corresponds to the outer yoke 42 and coil 43 of the prior art invention, respectively. Each of the first yoke 32 and coil 33 is fixed to the tube 21, independent of the reciprocating motion of the piston 222 and the movable element 31. Therefore, the relative relationship between the permanent magnet 313, which moves together with the piston 222, shaft 311, and second yoke 312, and the first yoke 32 and coil 33, which are fixed independently of the piston 222, shaft 311, and second yoke 312, changes over time. As a result, a current flows in the coil 33 due to the time change in the magnetic flux density circulating around the coil 33.

[0048] Therefore, when a sound wave is input to the second port P2, the conversion structure 20 converts the acoustic energy of the sound wave into the kinetic energy of the piston 222 of the vibrator 22, and the motor 30 converts this kinetic energy into electrical energy. Thus, the conversion device 10 can generate electricity using the acoustic energy of the sound wave.

[0049] Furthermore, when power is input to the first port P1, the converter 10 converts electrical energy into kinetic energy generated by the reciprocating motion of the piston 222 by the motor 30, and the conversion structure 20 generates sound waves from the reciprocating motion of the piston 222, thereby converting the kinetic energy into acoustic energy. In other words, the converter 10 can output sound waves from the second port P2.

[0050] Next, a first modified example of motor 30, motor 30A, will be described with reference to Figure 5, and a second modified example of motor 30, motor 30B, will be described with reference to Figure 6.

[0051] Motor 30A, shown in Figure 5, is a moving coil type linear motor, unlike motor 30, which is a moving magnet type linear motor. Figure 5 is a schematic cross-sectional view of motor 30A. Here, we will briefly explain the differences between motor 30A and motor 30. Motor 30A comprises a movable element 31A, a yoke 32A, and a permanent magnet 33A.

[0052] The movable element 31A corresponds to the movable element 31 of the motor 30. However, in the motor 30, the second yoke 312 and the permanent magnet 313 are fixed to the shaft 311, and the permanent magnet 313 is configured to perform translational motion. In contrast, in the motor 30A, the coil 312A is fixed to the shaft 311A, and the coil 312A is configured to perform translational motion.

[0053] Yoke 32A corresponds to the first yoke 32 and second yoke 312 of motor 30. However, in motor 30, the first yoke 32 is fixed to pipe 21, and the second yoke 312 moves in translation relative to pipe 21 and the first yoke 32. In contrast, in motor 30A, the first yoke 321A, the second yoke 322A, and the permanent magnet 33A that constitute the yoke 32 are fixed to pipe 21, and the coil 312A moves in translation relative to the first yoke 321A, the second yoke 322A, and the permanent magnet 33A that are fixed.

[0054] The motor 30B shown in Figure 6 employs a rotary motor 32B instead of the linear motor used in motors 30 and 30A. The rotary motor 32B is a motor that converts electrical energy into kinetic energy by the rotation of a rotor (not shown in Figure 6) equipped with multiple coils and an output shaft 321B connected to the rotor.

[0055] As shown in Figure 6, the motor 30B comprises a movable element 31B and a rotary motor 32B. In the motor 30B, the movable element 31B comprises a rotor 311B, a connecting rod 312B, and a translation element 313B.

[0056] The movable element 31B has a configuration very similar to that of a reciprocating engine in that it converts reciprocating motion into rotational motion. Therefore, the movable element 31B will be briefly explained below in comparison to a reciprocating engine.

[0057] The rotor 311B is a component that corresponds to the crankshaft of a reciprocating engine. The rotor 311B is a disc-shaped component. The output shaft 321B of the rotary motor 32B is connected to the center of the rotor 311B. Therefore, as the output shaft 321B rotates, the rotor 311B also rotates. Arrow A in Figure 6 represents the rotational motion of the rotor 311B.

[0058] The connecting rod 312B is a component that corresponds to the connecting rod (sometimes called a connecting rod) of a reciprocating engine. One end of the connecting rod 312B is rotatably connected to the rotor 311B at a predetermined radius, and the other end is connected to one end of the translator 313B, which will be described later. The connecting rod 312B is a rod-shaped member that extends along one axis.

[0059] The translator 313B, along with the piston 222 of the vibrator 22 to which its tip is connected, is a component corresponding to the piston of a reciprocating engine. One end of the translator 313B (the right end in Figure 6) is connected to the other end of the connecting rod 312B described above. The other end of the translator 313B (not shown in Figure 6) is connected to the piston 222 of the vibrator 22, similar to the movable element 31 shown in Figure 1.

[0060] The translator 313B's trajectory is restricted so that it translates in a direction parallel to the central axis of the tube 21. The rotor 311B and the translator 313B are connected by a connecting rod 312B, and as the rotor 311B rotates, the translator 313B reciprocates in sync with the rotation of the rotor 311B. The arrow B shown in Figure 6 represents the reciprocating motion of the translator 313B.

[0061] Motor 30B, configured in this way, converts the kinetic energy of the piston 222 into electrical energy, similar to motors 30 and 30A.

[0062] Furthermore, each of the motors 30, 30A, and 30B can either take kinetic energy as input and output electrical energy, or take electrical energy as input and output kinetic energy. Therefore, these motors 30, 30A, and 30B can function as either generators or power sources.

[0063] Furthermore, the motor used in the conversion device 10 is not limited to the motors 30, 30A, and 30B described above, but may be any existing linear motor or rotary motor. In other words, the motor used in the conversion device 10 can be appropriately selected from linear motors and rotary motors available on the market, as well as linear motors and rotary motors that have been made public at the time of filing this application.

[0064] [Second Embodiment] A thermoacoustic system 1 according to a second embodiment of the present invention will be described with reference to Figure 7, and each of the first to fifth modified versions of the thermoacoustic system 1, the thermoacoustic systems 1A to 1E, will be described with reference to Figures 8 to 12. Figure 7 is a schematic cross-sectional view of the thermoacoustic system 1. The inset in Figure 7 is a plan view of the heat exchanger 442. Figures 8 to 12 are schematic cross-sectional views of the thermoacoustic systems 1A to 1E, respectively.

[0065] The thermoacoustic system 1 has a structure similar to the thermoacoustic engine 1B described in the second embodiment of Patent Document 3. In this embodiment, the thermoacoustic system 1 will be described in comparison with the thermoacoustic engine 1B of Patent Document 3. The thermoacoustic device 40 is an example of a thermoacoustic power generation system, which is one aspect of the present invention.

[0066] As shown in Figure 7, the thermoacoustic system 1 comprises a converter 10 and a thermoacoustic device 40 connected to the second port P2 of the converter 10. The thermoacoustic device 40 converts thermal energy and acoustic energy. The thermoacoustic device 40 inputs sound waves having acoustic energy converted from thermal energy to the second port P2 of the converter 10.

[0067] As shown in Figure 7, the thermoacoustic device 40 comprises a loop pipe 41, a branch pipe 42, a three-way branch 43, and a thermoacoustic core 44. The loop pipe 41, branch pipe 42, and thermoacoustic core 44 each correspond to the loop pipe 30, branch pipe 40, and thermoacoustic core section 10 of the thermoacoustic engine 1B of Patent Document 3, respectively. The thermoacoustic core 44 of the thermoacoustic device 40 converts the input thermal energy into acoustic energy, the conversion structure 20 of the conversion device 10 converts the acoustic energy converted by the thermoacoustic core 44 into kinetic energy, and the motor 30 converts the kinetic energy converted by the thermoacoustic core 44 into electrical energy and outputs the electrical energy.

[0068] One end of the branch pipe 42 is connected to the second port P2. The other end of the branch pipe 42 is connected to one of the three ports of the three-way branch 43. The remaining two ports of the three-way branch 43 are each connected to one end and the other end of a ring-shaped pipe, respectively. The loop pipe 41 is composed of the ring-shaped pipe and the two ports of the three-way branch 43. That is, the loop pipe 41 is connected to the second port P2 via the one port of the three-way branch 43 and the branch pipe 42. Furthermore, the loop pipe 41, the branch pipe 42, the three-way branch 43, and the second space S2 of the converter 10 are filled with working gas.

[0069] The thermoacoustic core 44 is provided in a portion of the loop pipe 41. The thermoacoustic core 44 comprises a heat accumulator 441, a heat exchanger 442, and a heat exchanger 443. Heat exchangers 442 and 443 are an example of a pair of heat exchangers. The heat accumulator 441 is interposed between the heat exchangers 442 and 443. In other words, when viewed from the side closer to the second port P2 (i.e., the side of the three-way branch 43), the heat accumulator 441, heat exchanger 442, and heat exchanger 443 are arranged in the order of heat exchanger 442, heat accumulator 441, and heat exchanger 443, and adjacent heat exchangers 442 and heat accumulator 441, as well as heat accumulator 441 and heat exchanger 443, are in contact with each other. The heat accumulator 441, heat exchanger 442, and heat exchanger 443 each correspond to the heat accumulator 11, heater 12, and cooler 13 in the thermoacoustic core section 10 of the thermoacoustic engine 1B, respectively.

[0070] The thermoacoustic core 44 converts thermal energy into acoustic energy. The thermoacoustic core 44 also acts as a prime mover that amplifies the acoustic power of the working gas. In the thermoacoustic core 44, heat exchangers 442 and 443 are arranged on either end of the heat accumulator 441, sandwiching the accumulator 441. As shown in Figure 7, heat exchanger 442 is located on the side closer to the conversion device 10 (the lower side in Figure 7), and heat exchanger 443 is located on the side further away from the conversion device 10 (the upper side in Figure 7).

[0071] In this embodiment, a ceramic honeycomb structure having numerous parallel passages penetrating from one end to the other is used as the heat storage device 441. However, the configuration of the heat storage device 441 is not limited to this, and for example, it may be a structure made of many stainless steel mesh thin plates stacked at a minute pitch, or it may be a nonwoven fabric made of metal fibers (e.g., steel wool).

[0072] The heat exchanger 442, which is the heat exchanger closer to the second port P2, functions as an input port for supplying thermal energy to the thermoacoustic device 40. Heat exchanger 442 is a high-temperature heat exchanger that heats one end of the heat accumulator 441. A plan view of heat exchanger 442 is shown in the inset of Figure 7. As shown in this inset, heat exchanger 442 comprises a frame 4421, tubes 4422, and fins 4423.

[0073] The frame 4421 is an annular metal member, configured so that its outer surface is fixed to the inner wall of the loop pipe 41. The tube 4422 is configured to carry a fluid with relatively high thermal energy (such as a heat transfer medium or refrigerant, exemplified by exhaust gas or cooling water). In this embodiment, two tubes 4422 are used, but the number is not limited.

[0074] Tube 4422 is fixed to the annular frame 4421, passing through it, and is used for heat input, cooling, and heat extraction. In other words, tube 4422 transfers thermal energy between the working gas filled inside the loop tube 41 and the outside of the thermoacoustic device 40 via the fins 4423, which will be described later.

[0075] The fins 4423 are multiple thin metal plates provided in the internal space of the annular frame 4421. The multiple fins 4423 assist in the heat exchange that occurs between the working gas and the tube 4422, thereby increasing the efficiency of the heat exchange.

[0076] The heat exchanger 443 is configured to release heat from the other end of the heat accumulator 441 to the outside. Specifically, the heat exchanger 443 is a room-temperature heat exchanger that cools or releases heat from the other end of the heat accumulator 441 using cooling water or cooled air. The heat exchanger 443 is configured in the same way as the heat exchanger 442 described above.

[0077] The thermoacoustic core 44, which receives thermal energy from the heat exchanger 442 configured in this way, converts the thermal energy into acoustic energy and outputs sound waves containing that acoustic energy. The sound waves output from the thermoacoustic core 44 are propagated by the branch pipe 42 in the direction of arrow C (see Figure 7) and input to the second port P2 of the conversion device 10.

[0078] The conversion structure 20 converts the acoustic energy input to the second port P2 into the kinetic energy of the piston 222.

[0079] The motor 30 converts the kinetic energy converted by the conversion structure 20 into electrical energy.

[0080] Therefore, the thermoacoustic system 1 can utilize thermal energy such as waste heat from factories or clean, renewable energy like solar power for power generation without wasting it. Specifically, the loop tube 41 of the thermoacoustic device 40 in the thermoacoustic system 1, which is equipped with a thermoacoustic core 44, functions as a prime mover loop that utilizes thermal energy. In other words, the thermoacoustic system 1 functions as a thermoacoustic power generation system. Such effects contribute, for example, to achieving Goal 7 of the United Nations' Sustainable Development Goals (SDGs), "Affordable and Clean Energy."

[0081] Next, the thermoacoustic system 1A will be described. The thermoacoustic system 1A has a configuration very similar to that of the thermoacoustic system 1, but instead of the thermoacoustic core 44 that the thermoacoustic system 1 has, it is equipped with a thermoacoustic core 44A. In this modified example, the thermoacoustic device equipped with the thermoacoustic core 44A is referred to as the thermoacoustic device 40A. The thermoacoustic device 40A is an example of a thermoacoustic heat pump system, which is one aspect of the present invention, and can also be called a thermoacoustic cooling system.

[0082] The thermoacoustic core 44A comprises a heat accumulator 441, a heat exchanger 442A, and a heat exchanger 443. That is, the thermoacoustic system 1A is obtained by replacing the heat exchanger 442 in the thermoacoustic system 1 with a heat exchanger 442A. The heat exchanger 442 used in the thermoacoustic system 1 is a heat exchanger for high temperatures. On the other hand, the heat exchanger 442A used in the thermoacoustic system 1A is a heat exchanger for low temperatures that is cooled by the heat pump effect that occurs when acoustic energy is input to the heat accumulator 441.

[0083] In the thermoacoustic system 1A configured in this way, electrical energy is input to the motor 30 of the converter 10. The motor 30 converts the input electrical energy into kinetic energy and inputs that kinetic energy to the conversion structure 20. The conversion structure 20 converts the input kinetic energy into acoustic energy and inputs sound waves with that acoustic energy to the thermoacoustic device 40A. The branch pipe 42 of the thermoacoustic device 40A propagates the input sound waves in the direction of arrow D (see Figure 8) and inputs them to the thermoacoustic core 44A. The thermoacoustic core 44A receives the acoustic energy of the sound waves, and a heat pump effect occurs in the heat accumulator 441, transporting heat from a low temperature to a high temperature, thereby lowering the temperature of one of the heat exchangers, the heat exchanger 442A. Therefore, the heat exchanger 442A, which is the heat exchanger closer to the second port P2, functions as a cooling port that removes thermal energy from the target object.

[0084] Thus, the loop tube 41 of the thermoacoustic device 40A provided in the thermoacoustic system 1A, which is equipped with a thermoacoustic core 44A, functions as a thermoacoustic cooler loop that utilizes acoustic energy. In other words, the thermoacoustic system 1A functions as a thermoacoustic cooling system.

[0085] Next, the thermoacoustic system 1B will be described. Like the thermoacoustic system 1A, the thermoacoustic system 1B is an example of a thermoacoustic heat pump system. However, while the thermoacoustic system 1A was a thermoacoustic cooling system, the thermoacoustic system 1B is a thermoacoustic heating system. The thermoacoustic system 1B has a configuration very similar to the thermoacoustic system 1, but instead of the thermoacoustic core 44 that the thermoacoustic system 1 has, it has a thermoacoustic core 44B. In this modified example, the thermoacoustic device equipped with the thermoacoustic core 44B is referred to as the thermoacoustic device 40B.

[0086] The thermoacoustic core 44B includes a heat accumulator 441, a heat exchanger 442B, and a heat exchanger 443B. That is, the thermoacoustic system 1B is obtained by replacing the heat exchangers 442 and 443 in the thermoacoustic system 1 with heat exchangers 442B and 443B. In the thermoacoustic system 1, heat exchanger 442 is a heat exchanger for high temperatures, and heat exchanger 443 is a heat exchanger for room temperature. On the other hand, the heat exchanger 442B used in the thermoacoustic system 1A is a heat exchanger for room temperature, and heat exchanger 443B is a heat exchanger for high temperatures that is heated by the heat pump effect that occurs when acoustic energy is input to the heat accumulator 441.

[0087] In the thermoacoustic system 1B configured in this way, the sound waves with the converted acoustic energy propagate in the direction of arrow D (see Figure 9) and are input to the thermoacoustic core 44B. The thermoacoustic core 44B receives the acoustic energy of the sound waves, and a heat pump effect occurs in the heat accumulator 441, which transports heat from a low temperature to a high temperature, thereby raising the temperature of one of the heat exchangers, the heat exchanger 443B. Therefore, the heat exchanger 443B, which is the heat exchanger furthest from the second port P2, functions as a heating port that provides thermal energy to the target object.

[0088] Thus, the loop tube 41 of the thermoacoustic device 40B provided in the thermoacoustic system 1B, which is equipped with a thermoacoustic core 44B, functions as a thermoacoustic heating loop that utilizes acoustic energy. In other words, the thermoacoustic system 1B functions as a thermoacoustic heating system.

[0089] Next, we will describe the thermoacoustic systems 1C to 1E. Thermoacoustic system 1C is an example of a thermoacoustic power generation system, similar to thermoacoustic system 1. Thermoacoustic system 1D is an example of a thermoacoustic heat pump system, similar to thermoacoustic system 1A, and is also an example of a thermoacoustic cooling system. Thermoacoustic system 1E is an example of a thermoacoustic heat pump system, similar to thermoacoustic system 1B, and is also an example of a thermoacoustic heating system.

[0090] Each of the thermoacoustic systems 1, 1A, and 1B is equipped with a loop tube 41 as described above, and each loop tube 41 has a thermoacoustic core 44, 44A, and 44B in a portion of it, respectively. On the other hand, each of the thermoacoustic systems 1C, 1D, and 1E is equipped with a straight tube 41C, 41D, and 41E instead of a loop tube 41, and each straight tube 41C, 41D, and 41E has a thermoacoustic core 44, 44A, and 44B in a portion of it, respectively.

[0091] Each of the thermoacoustic systems 1C, 1D, and 1E, configured in this way, functions similarly to thermoacoustic systems 1, 1A, and 1B, respectively.

[0092] Furthermore, the motors used in each of the thermoacoustic systems 1, 1A to 1E may be of any type as long as they have a movable element and are capable of converting the kinetic energy associated with the reciprocating motion of the movable element into electrical energy. The motor is not limited to the motor 30 shown in Figure 4, but may also be the motor 30A shown in Figure 5, the motor 30B shown in Figure 6, or any existing linear motor or rotary motor. In other words, the motors used in each of the thermoacoustic systems 1, 1A can be appropriately selected from motors that are currently available on the market or publicly available, regardless of whether they are from the past, present, or future.

[0093] 〔summary〕 In a conversion structure for acoustic energy and kinetic energy, in order to improve sealing performance and reduce sliding resistance compared to a conventional conversion structure with a tube and piston, the conversion structure according to the first embodiment of the present invention is a conversion structure comprising: a tube including a first port to which a motor that converts kinetic energy and electrical energy is connected, and a second port to which a thermoacoustic device is connected; and a vibrator that separates the internal space of the tube into a first space located on the first port side and a second space located on the second port side, and is connected to the movable element of the motor. Furthermore, in the conversion structure according to the first embodiment of the present invention, the vibrator comprises a piston and a seal made of an elastic material that surrounds the outer edge of the piston and is in close contact with the outer edge of the piston, wherein the outer edge of the seal is in close contact with the inner wall of the tube over the entire circumference of the inner wall, and at least a part of the outer edge of the seal is fixed to the inner wall.

[0094] According to the above configuration, the seal surrounds the outer edge of the piston and adheres tightly to the entire circumference of the inner wall of the pipe. Therefore, in the conversion structure according to the first aspect of the present invention, the first space and the second space are not in communication. For this reason, the first aspect of the present invention has higher sealing performance compared to the conversion structure described in Patent Document 1.

[0095] Furthermore, according to the above configuration, the seal is made of an elastic material, and at least a portion of its outer edge is fixed to the inner wall of the pipe. Therefore, in the conversion structure according to the first aspect of the present invention, the seal undergoes elastic deformation, and the piston performs a periodic reciprocating motion in the space inside the pipe (i.e., behaves as a harmonic oscillator) in accordance with this elastic deformation. Unlike the conversion structure described in Patent Document 1, the conversion structure according to the first aspect of the present invention does not have a sliding part at the boundary between the inner wall and the seal. Therefore, the first aspect of the present invention can reduce sliding resistance compared to the conversion structure described in Patent Document 1.

[0096] Thus, the first aspect of the present invention can reduce sliding resistance while improving sealing performance compared to the conversion structure described in Patent Document 1, and can therefore improve the conversion efficiency between acoustic energy and kinetic energy.

[0097] Furthermore, in the conversion structure according to the second aspect of the present invention, in addition to the configuration of the conversion structure according to the first aspect described above, the elastic body is made of rubber.

[0098] According to the above configuration, seals can be manufactured inexpensively and easily.

[0099] Furthermore, in the conversion structure according to the third aspect of the present invention, in addition to the configuration of the conversion structure according to the second or third aspect described above, the piston is made of a material having a greater modulus of elasticity than the elastic body.

[0100] With the above configuration, the central piston is less prone to deformation than the seal. Therefore, when the diaphragm vibrator absorbs acoustic energy, the piston does not undergo much elastic deformation, and the vibrator reciprocates mainly due to the elastic deformation of the seal. Consequently, higher-order vibration modes that may arise due to the elastic deformation of the piston in the conversion section can be suppressed, thereby further increasing the conversion efficiency between acoustic energy and kinetic energy.

[0101] To achieve the above objective, the conversion device according to the fourth aspect of the present invention comprises the conversion structure according to the first or second aspect described above, and a motor connected to the first port that converts kinetic energy to electrical energy and has a movable element, wherein the movable element is connected to the vibrator.

[0102] To achieve the above objective, a thermoacoustic system according to a fifth aspect of the present invention comprises a conversion device according to the fourth aspect described above, and a thermoacoustic device connected to the second port that converts thermal energy and acoustic energy.

[0103] According to the above configuration, the conversion device according to the fourth aspect of the present invention and the thermoacoustic system according to the fifth aspect of the present invention each achieve the same effect as the conversion structure according to the first aspect of the present invention. Therefore, the conversion efficiency between acoustic energy and electrical energy can be increased.

[0104] To solve the above problems, the thermoacoustic power generation system according to the sixth aspect of the present invention comprises a conversion device according to the fourth aspect described above, and a thermoacoustic device connected to the second port, the thermoacoustic device having a thermoacoustic core. Furthermore, in the thermoacoustic power generation system according to the sixth aspect, the thermoacoustic core converts thermal energy into acoustic energy, the conversion structure converts the acoustic energy into kinetic energy, and the motor converts the kinetic energy into electrical energy and outputs it.

[0105] To solve the above problems, the thermoacoustic heat pump system according to the seventh aspect of the present invention comprises a conversion device according to the fourth aspect described above, and a thermoacoustic device connected to the second port, the thermoacoustic device having a thermoacoustic core. Furthermore, in the thermoacoustic heat pump system according to the seventh aspect, the motor converts electrical energy into kinetic energy, the conversion structure converts the kinetic energy into acoustic energy, and the thermoacoustic core generates a heat pump effect associated with the input acoustic energy.

[0106] A thermoacoustic power generation system according to one aspect of the present invention can also be used as a power generation system using a motor by inputting thermal energy into the thermoacoustic core of the thermoacoustic device. Furthermore, a thermoacoustic heat pump system according to one aspect of the present invention can also be used as a cooling system utilizing the heat pump effect in the thermoacoustic core by inputting sound waves generated by the motor and conversion structure into the thermoacoustic device.

[0107] [Additional Notes] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Examples]

[0108] A converter 10, which is one embodiment of the present invention, will be described with reference to Figures 13 to 15. Figure 13 is a schematic diagram of the experimental apparatus 100 used in this embodiment. Figure 14 is a schematic diagram of the experimental apparatus 100X used in a reference example of the present invention. Figure 15 is a graph showing the frequency dependence of the power generation efficiency obtained in this embodiment and the reference example.

[0109] In this embodiment, a commercially available rubber speaker edge was used as the seal 221 of the converter 10, and an aluminum plate was used as the piston 222. The outer edge of the seal 221 and the inner wall of the tube 21 were fixed together without any gaps using adhesive. Similarly, the outer edge of the piston 222 and the inner edge of the seal 221 were fixed together without any gaps using adhesive. A linear motor was used as the motor 30. An external resistor RE of 60Ω and a logger LG for recording output data from the motor 30 were connected to the motor 30 as an external circuit. A speaker SP was connected to the second port P2 of the converter 10 via a waveguide 25, and acoustic power was applied to the second port P2 of the converter 10.

[0110] On the other hand, in the example experimental apparatus 100X, the tube 21 and oscillator 22 of experimental apparatus 100 were replaced with bellows 21X, while the rest was the same as experimental apparatus 100.

[0111] In experimental setups 100 and 100X, the motor 30 was vibrated by sound waves (acoustic power) output from speaker SP, and the power generation efficiency E was determined. At this time, the frequency of the sound waves was set in the range of 20 to 40 Hz, and the output of speaker SP was adjusted so that the movable element 31 of motor 30 vibrated with a single amplitude of 1 mm.

[0112] The power generation efficiency E is the ratio of the power Pout output from the motor 30 to the acoustic power Pin input to the motor 30 (E = Pout / Pin). The acoustic power Pin is defined as the acoustic power at the second port P2 (the end of the waveguide 25), and the power Pout is determined by measuring the power consumed by the external resistor RE.

[0113] As shown in Figure 15, in the reference example, the power generation efficiency was maximized (approximately 70%) at a frequency of 26 Hz, and then decreased as the frequency increased, falling to less than 10% at a frequency of 36 Hz. On the other hand, in this embodiment, the power generation efficiency was 70% or higher in the experimental range of 20 Hz to 40 Hz. [Explanation of symbols]

[0114] 1. 1A Thermoacoustic System 10 Conversion device 20 Transformation Structures 21 tube 22 transducers 221 Seals 222 Piston P1, P2: Port 1, Port 2 Si pipe space S1, S2 1st space, 2nd space 30, 30A, 30B motors 31, 31B Mover 40, 40A thermoacoustic device 44, 44A Thermoacoustic Core

Claims

1. A tube including a first port for connecting a motor that converts kinetic energy and electrical energy, and a second port for connecting a thermoacoustic device, A conversion structure comprising a vibrator that divides the internal space of the pipe into a first space located on the first port side and a second space located on the second port side, the vibrator being connected to the movable element of the motor, The vibrator comprises a piston and a seal made of an elastic material that surrounds the outer edge of the piston and is in close contact with the outer edge of the piston. The seal is such that its outer edge is in close contact with the inner wall of the pipe over its entire circumference. A conversion structure in which at least a portion of the outer edge of the seal is fixed to the inner wall.

2. The conversion structure according to claim 1, wherein the elastic body is rubber.

3. The conversion structure according to claim 1 or 2, wherein the piston is made of a material having a greater modulus of elasticity than the elastic body.

4. The conversion structure according to claim 1 or 2, The first port is connected to a motor that converts kinetic energy to electrical energy, and the motor has a movable element, The movable element is a converter connected to the vibrator.

5. The conversion device according to claim 4, A thermoacoustic system comprising a thermoacoustic device connected to the second port, which converts thermal energy to acoustic energy.

6. The conversion device according to claim 4, A thermoacoustic device connected to the second port, comprising a thermoacoustic device having a thermoacoustic core, The aforementioned thermoacoustic core converts thermal energy into acoustic energy, The aforementioned conversion structure converts the acoustic energy into kinetic energy, The motor is a thermoacoustic power generation system that converts the kinetic energy into electrical energy and outputs it.

7. The conversion device according to claim 4, A thermoacoustic device connected to the second port, comprising a thermoacoustic device having a thermoacoustic core, The motor converts electrical energy into kinetic energy, The aforementioned conversion structure converts the kinetic energy into acoustic energy, The thermoacoustic core generates a heat pump effect associated with the input acoustic energy, forming a thermoacoustic heat pump system.

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