JP6386230B2 - Thermal accumulator for thermoacoustic devices - Google Patents

Description

  The present invention relates to a heat accumulator for a thermoacoustic device.

  Conventionally, various thermoacoustic apparatuses that convert thermal energy into acoustic energy have been proposed. As an example of such a thermoacoustic device, Patent Document 1 includes a loop pipe in which a working gas is sealed, a branch pipe branched from the loop pipe, and a heat accumulator disposed in the loop pipe, and a heat accumulator. What is comprised so that a temperature gradient may be generated between the both ends of this is disclosed. In this thermoacoustic apparatus, a transducer is connected to the branch pipe, and a large number of pores are provided inside the heat accumulator. Then, by generating a temperature gradient between both ends of the heat accumulator, heat is transferred from the working gas to the heat accumulator through the pores inside the heat accumulator, and the working gas is thermally expanded and contracted to generate sound waves (in the loop tube). Working gas). Thereby, the thermal energy which produced the temperature gradient between the both ends of a thermal accumulator is converted into acoustic energy. The sound wave (acoustic energy) is amplified through the loop tube and the branch tube, transmitted to the transducer, and converted into electrical energy.

  The pores inside the heat accumulator are formed by stacking metal mesh materials or by laminating metal thin plates on which a large number of pores are formed. In addition to these, it is also possible to form pores inside the regenerator by laminating wire mesh knitted wires, sintering a plurality of metal spheres, or concentrating ultrafine pipes. It has been broken. In addition, a heat accumulator is formed by a ceramic honeycomb made of porous ceramics, and pores are formed by the cells (holes).

JP 2005-233037 A

  However, according to the configuration disclosed in Patent Document 1, the energy conversion efficiency and the energy output have theoretically high values, but are actually much lower than the theoretical values. One of the reasons is that the energy conversion efficiency from heat to sound waves performed inside the regenerator is significantly lower than the theoretical conversion efficiency.

  Specifically, among various factors, the pore diameter inside the regenerator, the thermal conductivity of the regenerator itself, the aperture ratio of the pores in the regenerator, and the shape of the pores greatly affect the energy conversion efficiency inside the regenerator. Is known to affect. Therefore, the energy conversion efficiency inside the heat accumulator can be improved by optimizing these conditions.

  The optimum value of the pore diameter inside the regenerator fluctuates depending on conditions such as the gas pressure and operating temperature of the working gas, but generally the higher the working gas inside the regenerator is at higher and lower temperatures, the more appropriate value is There is a tendency to become smaller. For example, when liquefied natural gas (LNG) is employed as a cold heat source for generating a temperature gradient in the regenerator, the appropriate value of the pore diameter is 100 μm or less, and the appropriate value is in a very small value range. Therefore, it is required to set the pore diameter to be sufficiently small according to conditions such as the gas pressure of the working gas and the working temperature. When the pore diameter inside the heat accumulator cannot be set to a sufficiently small value, it becomes difficult to set the pore diameter to an appropriate value, which may cause a decrease in energy conversion efficiency inside the heat accumulator.

  In the configuration disclosed in Patent Document 1, when the pores are formed by overlapping metal mesh materials, the pore diameter can be reduced, but the pore shape is not linear. At the same time, the pore diameter is not uniform. For this reason, the generation amount of sound waves generated by the thermal expansion and contraction of the working gas in the pores and the propagation direction of the sound waves become non-uniform, and the propagation efficiency of acoustic energy is reduced. As a result, the energy conversion efficiency inside the heat accumulator decreases. Further, when the pore diameter is reduced, the aperture ratio is lowered. When the aperture ratio of the pores inside the heat accumulator is low, the heat exchange efficiency between the working gas and the heat accumulator via the pores is lowered, so that the energy conversion efficiency inside the heat accumulator is lowered.

  In addition, when the pores inside the heat accumulator are formed by laminating metal thin plates having a large number of pores, the pores must be formed in the correct size and position by pattern etching. As a result, a large number of linear pores that are not blocked can be formed. However, in the case of pattern etching, the partition walls that partition the pores cannot be made sufficiently thin. Therefore, when the pore diameter becomes small, the partition walls become thicker than the pore diameter, and the aperture ratio of the pores decreases. . Therefore, also in this case, as described above, the energy conversion efficiency inside the heat accumulator is lowered.

  Moreover, when the pores inside the heat accumulator are formed by densely gathering extremely fine pipes, a large number of linear pores that are not blocked can be formed, and the pore diameter can be made sufficiently small. However, when the pore diameter becomes small, the pipe becomes thick with respect to the pore diameter, and the aperture ratio of the pores decreases. Therefore, also in this case, as described above, the energy conversion efficiency inside the heat accumulator is lowered.

  In addition, when the heat accumulator is formed of a metal mesh material or a metal thin plate, the heat conductivity of the heat accumulator itself may be relatively high. In this case, even if a temperature gradient is generated between both ends of the heat accumulator, heat is not propagated to the working gas in the heat accumulator but is easily propagated to the heat accumulator itself. May decrease.

  In addition, when the pores are formed by laminating a wire mesh knitted with a wire or by sintering a plurality of metal spheres, the shape of the pores does not become linear. The energy conversion efficiency inside the chamber is reduced. In these cases, some of the pores may be blocked. When the pores are blocked, the working gas cannot flow through the pores, so that the propagation of sound waves is hindered and the conversion efficiency to acoustic energy is reduced.

  In addition, when the pores are formed of ceramic honeycomb cells, while maintaining the thermal conductivity of the regenerator itself low, the pores can be linear and not blocked. A high aperture ratio can be ensured. However, although the lower limit of the cell diameter is equivalent to 250 μm, there is room for improvement because a smaller pore diameter may be required to improve the energy conversion efficiency inside the regenerator. .

  The present invention has been made in view of such a background, and intends to provide a heat accumulator for a thermoacoustic apparatus having high energy conversion efficiency from heat to sound waves.

In one embodiment of the present invention, a plurality of base materials each made of a resin thin film are stacked via a spacer layer,
In the spacer layer, a plurality of spacers extending perpendicularly to the stacking direction of the base material and formed over both end portions of the base material are arranged in parallel with each other at equal intervals, and the stacked layers A plurality of linear and non-blocking pores formed by the substrate and the spacers adjacent to each other are formed,
The height of the stacking direction of the spacers state, and are in the range of 50 to 200 [mu] m,
The spacing between the adjacent spacers is in the range of 500 to 2000 μm,
The aperture ratio of the pores is in the range of 70 to 90%,
The thermal conductivity of the material for forming the base material and the spacer is 10 W / mK or less, and the heat accumulator for a thermoacoustic device is provided.

  In the heat accumulator for a thermoacoustic device, a plurality of pores surrounded by the laminated base material and spacers arranged in parallel to each other are formed. The opening width of the pores is defined by the spacing in the arrangement direction of adjacent spacers in the spacer layer, and the opening height of the pores (the length in the direction perpendicular to the opening width) is defined by the thickness of the spacer. Is done. Thereby, the opening width and opening height of the plurality of pores can be easily reduced and made uniform by reducing the interval and thickness of the spacers. Furthermore, since both the base material and the spacer are made of resin, the thermal conductivity can be lowered as compared with the case of being made of metal. Further, since the plurality of pores are partitioned by the base material and the spacer, the aperture ratio of the pores in the heat accumulator can be easily increased by adjusting the thickness of the base material and the width and height of the spacer. . And since the pore is formed along the spacer extended perpendicularly | vertically to the lamination direction of a base material, while being formed in linear form, the pore is not obstruct | occluded on the way.

  That is, the pore diameter defined by the opening width and height of the pores is made sufficiently small (first condition), the thermal conductivity of the regenerator itself is kept low (second condition), and the opening ratio of the pores Can be made high (third condition), and the pores can be made straight and non-blocked (fourth condition). The heat accumulator for the thermoacoustic device exhibits high energy conversion efficiency by positively adopting a configuration that satisfies all these four conditions.

  ADVANTAGE OF THE INVENTION According to this invention, the thermal accumulator for thermoacoustic apparatuses with high energy conversion efficiency from a heat | fever to a sound wave can be provided.

1 is a schematic diagram of a thermoacoustic apparatus including a heat accumulator in Embodiment 1. FIG. 1 is a perspective view of a heat accumulator in Example 1. FIG. FIG. 3 is a partially enlarged view of a section taken along the line III-III in FIG. 2. FIG. 3 is a development view of the heat accumulator in the first embodiment. The partially expanded view of the VV line position cross section in FIG.

  In the above heat accumulator for thermoacoustic devices, “the plurality of spacers are parallel to each other and equally spaced” means that the plurality of spacers are completely parallel and equally spaced apart from each other. Even when the distance is not equal, it includes a case where it can be recognized that the distance is substantially parallel and equally spaced within the range where the above-described effects are achieved.

  The appropriate value of the pore diameter (first condition) inside the regenerator can be determined in consideration of conditions such as the gas pressure of the working gas and the working temperature. For example, when liquefied natural gas (LNG) is adopted as a cold source for generating a temperature gradient between both ends of the regenerator, the gas pressure of the working gas is 1 MPa to 3 MPa, and the working temperature is −100 ° C. to −160 ° C. In this case, an appropriate value of the pore diameter can be 50 to 200 μm, more preferably 60 to 100 μm, and still more preferably 70 to 90 μm. Thereby, the energy conversion efficiency inside a thermal storage device is improved.

  The thermal conductivity (second condition) of the regenerator itself is preferably low. As a result, when a temperature gradient is generated between both ends of the regenerator, heat is not propagated to the regenerator itself without being propagated to the working gas, and heat is actively propagated to the working gas. Therefore, energy conversion efficiency can be improved. Since the thermal conductivity of the heat accumulator itself depends on the thermal conductivity of the pore forming material, it is preferable to employ a material having a low thermal conductivity as the pore (base material and spacer) forming material. For example, the thermal conductivity of the material for forming the base material and the spacer is preferably 10 W / mK or less, and more preferably 1 W / mK or less. For example, polypropylene, polyethylene, polyethylene terephthalate, or the like can be used as a material for forming the base material and the spacer.

  The base material needs to have a predetermined strength in order to securely hold the spacer and maintain the shape of the pores, and preferably has an appropriate flexibility from the viewpoint of handling properties when laminated. . For example, it is preferable to employ polypropylene as the base material forming material. This is because the thermal conductivity is low and the strength and flexibility are excellent.

  On the other hand, the spacer is preferably formed by printing a curable resin on the surface of the substrate. Thereby, a spacer can be easily arrange | positioned in the predetermined position of a base material. As a material for forming the spacer, a resin material that is cured by energy rays (for example, heat (heat rays), light (including light other than visible light such as ultraviolet rays), electron beams) can be used, for example, thermosetting resin. , A photo-curable resin, an electron beam curable resin, or the like can be used. Among these, it is preferable to employ a photocurable resin. Accordingly, it becomes easy to accurately form the spacers into a predetermined shape and accurately dispose the plurality of spacers at predetermined positions on the base material.

  Moreover, it is preferable that the aperture ratio (3rd condition) of the pore inside a thermal storage device is high. Thereby, the heat exchange efficiency between the working gas and the regenerator through the pores is improved, and the energy conversion efficiency inside the regenerator is improved. The aperture ratio of the pores inside the heat accumulator can be, for example, 70 to 90%, preferably 80 to 90%.

  The shape of the pores formed between the spacers is not closed but linear (fourth condition). Since the pores are not blocked, the working gas can flow through the pores. Thereby, the sound wave generated by the thermal expansion and contraction of the working gas is efficiently propagated, and the conversion efficiency from thermal energy to acoustic energy is improved. Furthermore, since the pores are linear, the propagation direction of sound waves generated by thermal expansion and contraction of the working gas in the pores becomes uniform, so that the propagation efficiency of acoustic energy is improved and the energy conversion efficiency is improved. It is done.

  The base material is preferably wound and laminated in a roll shape with an axis parallel to the extending direction of the plurality of spacers as a winding axis. Thereby, a plurality of spacers can be easily stacked so as to extend in the same direction. Moreover, since the formed heat accumulator becomes a columnar shape, it becomes easy to install the heat accumulator in a cylindrical loop tube provided in the thermoacoustic apparatus without a gap.

Example 1
A heat accumulator for a thermoacoustic apparatus according to an embodiment of this example will be described with reference to FIGS.
As shown in FIG. 3, the heat accumulator 1 for thermoacoustic apparatus (hereinafter also simply referred to as “heat accumulator 1”) provided in the thermoacoustic apparatus 100 shown in FIG. A plurality of layers are stacked via the spacer layer 20.
As shown in FIG. 4, a plurality of spacers 21 extending perpendicularly to the stacking direction of the base material 10 are arranged in the spacer layer 20 in parallel and at equal intervals.
As shown in FIG. 3, a plurality of pores 22 surrounded by the laminated base material 10 and the spacers 21 adjacent to each other are formed.
In this example, the stacking direction of the base materials 10 is the Z direction, the extending direction of the spacers 21 is the X direction, and the arrangement direction of the spacers 21 is the Y direction.

Hereinafter, the thermoacoustic apparatus 100 provided with the heat accumulator 1 of this example is explained in full detail.
The thermoacoustic apparatus 100 of this example includes a heat accumulator 1, a loop pipe 30, a branch pipe 40, a heater 50, a cooler 60, and a linear generator 70.

  The loop tube 30 is formed of a hollow tubular member and is formed in a substantially rectangular loop shape. A working gas is sealed in the loop tube 30. As the working gas, for example, helium gas, nitrogen gas, air, or the like can be employed. In this example, helium gas is employed.

  The branch pipe 40 is formed of a hollow tubular member in the same manner as the loop pipe 30. And it is connected with the loop pipe | tube 30, and it has extended from the corner | angular part of the loop pipe | tube 30, and has comprised linear form. A linear generator 70 is disposed at the tip of the branch pipe 40. The linear generator 70 includes a linear drive unit 71. The linear drive unit 71 is inserted into the end portion of the branch pipe 40 and can reciprocate in the extending direction of the branch pipe 40. The linear generator 70 generates power when the linear drive unit 71 is reciprocated.

  The loop tube 30 and the branch tube 40 function as a resonance tube that amplifies acoustic energy by repeatedly propagating sound waves generated by thermal expansion and contraction of the working gas.

  The heat accumulator 1 is held in the loop tube 30. A heater 50 is provided at the first end 1 a of the heat accumulator 1, and a cooler 60 is provided at the second end 1 b opposite to the first end 1 a of the heat accumulator 1. In this example, the direction from the first end 1a to the second end 1b is the X1 direction, the opposite direction to the X1 direction is the X2 direction, and the X1 direction and the X2 direction are collectively referred to as the X direction. And

  Water is supplied to the heater 50 as a heat source, and liquefied natural gas (LNG) is supplied to the cooler 60 as a heat source. Thereby, it is comprised so that a temperature gradient may generate | occur | produce between the both ends 1a and 1b of the thermal accumulator 1. FIG. As the heat source, exhaust gas, oil, etc. can be employed in addition to water. In addition to LNG, liquid nitrogen, liquefied carbon dioxide, or the like can be used as the cold heat source.

  As shown in FIG. 4, the heat accumulator 1 includes a base material 10 and a spacer 21. The substrate 10 is a thin film made of polypropylene and has a sheet shape. The film thickness of the substrate 10 can be determined in consideration of the aperture ratio, strength, flexibility, etc. of the pores 22, and is, for example, 10 to 30 μm, preferably 12 to 20 μm, more preferably 14 to 18 μm. In this example, as shown in FIG. 5, the film thickness s of the substrate 10 is 15 μm. The base 10 has a length in the X direction of 50 mm and a length in the Y direction of 20 m. Note that the substrate 10 may be cut into an appropriate shape according to the required shape of the regenerator 1.

  As shown in FIGS. 3 and 4, a plurality of spacers 21 are disposed on the front side surface 10 a of the base material 10 so as to extend in the X direction perpendicular to the stacking direction Z of the base material 10. The spacer 21 has a columnar shape whose longitudinal direction is the X direction. As shown in FIG. 4, the spacer 21 is formed across both end portions (X1 direction end portion and X2 direction end portion) of the front side surface 10 a of the base material 10 in the X direction. Therefore, the length of the spacer 21 in the X direction is the same as the length of the base material 10 in the X direction.

  As shown in FIG. 5, the cross-sectional shape of the spacer 21 in the Y direction is a rectangle. The length (width) w in the Y direction of the spacer 21 and the height h of the spacer 21 are set so that the aperture ratio of the pores 22 described later falls within a predetermined range. For example, the width w of the spacer 21 can be 1 to 20 times, preferably 5 to 20 times the assumed pore diameter, and the height h of the spacer 21 can be equivalent to the assumed pore diameter. . By setting the width w and the height h in such ranges, the spacer 21 is securely fixed to the substrate 10 and the spacer 21 is prevented from falling sideways. In this example, the width w of the spacer 21 is 100 μm, and the height h of the spacer 21 is 100 μm.

  As shown in FIGS. 4 and 5, the plurality of spacers 21 are arranged in parallel to the X direction and at equal intervals in the Y direction. The distance d between the spacers 21 adjacent to each other is also set so that the aperture ratio α of the pores 22 described later falls within a predetermined range. For example, the distance d can be 500 to 2000 μm, preferably 750 to 2000 μm, more preferably 900 to 2000 μm. By setting the distance d in such a range, the pore diameter of the pores 22 can be made sufficiently small while maintaining a high aperture ratio α of the pores 22 described later. In this example, the interval d is 900 μm.

  The spacer 21 is made of a photocurable resin. Then, after the photo-curing resin before curing is printed on the front side surface 10a of the base material 10, it is exposed and cured, whereby a plurality of spacers 21 are arranged on the front side surface 10a of the base material 10. ing.

  As shown in FIG. 2, the base material 10 on which the spacers 21 are arranged is wound and laminated in a roll shape with the mandrel 11 as a winding shaft. The mandrel 11 is a resin columnar member. The diameter of the mandrel 11 is 10 mm, and the axial direction of the mandrel 11 is parallel to the extending direction X of the plurality of spacers 21. The base material 10 on which the spacers 21 are disposed is wound in the arrangement direction Y of the spacers 21 with the front side surface 10a facing the axial center (mandrel 11) side. As a result, the upper surface 21b of the spacer 21 (the surface opposite to the lower surface 21a bonded to the front side surface 10a of the base material 10) 21b faces the back side surface 10b of the laminated base material 10 and contacts with it. ing. Thereby, as shown in FIG. 3, the spacer layer 20 is formed between the laminated base materials 10.

  The base material 10 is wound so that the outer diameter P of the heat accumulator 1 has a predetermined size. The outer diameter P of the heat accumulator 1 is preferably set to be the same as the inner diameter (not shown) of the loop tube 30. Thereby, it becomes easy to provide the heat accumulator 1 formed in a cylindrical shape with no gap with respect to the inner wall of the loop tube 30. For example, the outer diameter P of the heat accumulator 1 can be 40 to 150 mm, and in this example, the outer diameter P is 100 mm in accordance with the inner diameter (not shown) of the loop tube 30.

  In this example, the base material 10 is wound before the photo-curing resin as the forming material of the spacer 21 is completely cured, and the upper surface 21b of the spacer 21 and the back side surface 10b of the base material 10 are brought into contact with each other. After that, the photocurable resin is completely cured to join the upper surface 21b of the spacer 21 and the back side surface 10b of the substrate 10.

  As described above, by winding the base material 10 on which the spacer 21 is disposed, the spacer layer 20 is surrounded by the stacked base material 10 and the adjacent spacers 21 as shown in FIG. A pore 22 is formed. The pore 22 extends linearly in the X direction, opens to the first end 1a and the second end 1b, and closes between the first end 1a and the second end 1b. It has not been. Thus, the heat accumulator 1 in which a large number of pores 22 are integrated is formed.

  The opening width 22a of the pore 22 shown in FIG. 3 corresponds to the distance d between the adjacent spacers 21 shown in FIG. 5, and the opening height 22b of the pore 22 shown in FIG. Corresponds to height h. Since the spacers 21 have a uniform shape and are equally spaced, all the pores 22 have a substantially uniform opening width 22a and opening height 22b. Therefore, the aperture ratio α of the pores 22 in the heat accumulator 1 is derived by the following formula 1. In this example, the aperture ratio α of the pores 22 is 78.2%.

  α = (d × h) / ((s + h) × (d + w)) × 100 (Equation 1)

  As shown in FIG. 1, the heat accumulator 1 is disposed in the loop tube 30, and the working gas sealed in the loop tube 30 is filled in each pore 22.

  In the thermoacoustic apparatus 100 including the heat accumulator 1 of this example, the first end 1 a of the heat accumulator 1 is heated by the heater 50 and the second end 1 b of the heat accumulator 1 is cooled by the cooler 60. As a result, a temperature gradient is generated between both ends 1a and 1b of the heat accumulator 1. As a result, the working gas located on the first end 1a side in the large number of pores 22 is heated and expanded. Along with this, the heat of the working gas filled in the large number of pores 22 is immediately transmitted to the inner wall of the pores 22 to cool the working gas, so that the working gas contracts. As a result, the working gas rapidly expands and contracts, and sound waves (dense waves due to pressure fluctuations of the working gas in the loop tube 30) are generated. Thereby, the thermal energy which produced the temperature gradient between the both ends 1a and 1b will be converted into acoustic energy.

  Thereafter, the generated sound wave circulates in the loop tube 30. By repeatedly generating and circulating the sound wave, the sound wave is gradually amplified. As a result, the working gas moves in the loop pipe 30 as indicated by an arrow 31 in FIG. 1, and the working gas in the branch pipe 40 communicating with the loop pipe 30 reciprocates as indicated by an arrow 41. It will be. Along with this, the linear drive unit 71 disposed at the distal end portion of the branch pipe 40 reciprocates as indicated by an arrow 72, and the linear generator 70 generates power. Thereby, acoustic energy is converted into electric energy.

  According to the heat accumulator 1 for a thermoacoustic device, a plurality of pores 22 surrounded by the laminated base material 10 and the spacers 21 arranged in parallel to each other are formed. The opening width 22 a of the pores 22 is defined by the interval d in the arrangement direction Y of the spacers 21, and the opening height 22 b of the pores 22 is defined by the thickness h of the spacers 21. Thus, by reducing the distance d and the thickness h of the spacers 21, the opening width 22a and the opening height 22b of the plurality of pores 22 can be made small and uniform. Furthermore, since both the base material 10 and the spacer 21 are made of resin, the thermal conductivity can be lowered as compared with the case of being made of metal. Further, since the plurality of pores 22 are partitioned by the base material 10 and the spacer 21, the pores in the heat accumulator 1 are adjusted by adjusting the thickness s of the base material 10 and the width w and height h of the spacer 21. The aperture ratio α of 22 can be easily increased. Since the pores 22 are formed along the spacers 21 extending perpendicularly to the stacking direction Z of the base material 10, the pores 22 are formed in a straight line, and the pores 22 are blocked in the middle. Not.

  That is, the pore diameter defined by the opening width 22a and the opening height 22b of the pore 22 is made sufficiently small (first condition), the thermal conductivity of the regenerator 1 itself is kept low (second condition), and the fineness is reduced. The aperture ratio α of the pores can be increased (third condition), and the pores 22 can be linear and have a shape that is not blocked (fourth condition). The heat accumulator 1 of this example exhibits high energy conversion efficiency by satisfying all these four conditions.

  In this example, the base material 10 is wound and laminated in a roll shape with a mandrel 11 parallel to the extending direction X of the plurality of spacers 21 as a winding axis. Thereby, a plurality of spacers 21 can be easily stacked so as to extend in the same direction. Further, since the formed heat accumulator 1 has a cylindrical shape, it is easy to install the heat accumulator 1 on the inner wall of the cylindrical loop tube 30 without a gap.

  In this example, the spacer 21 is formed by printing a curable resin on the front side surface 10 a of the substrate 10. Thereby, the spacer 21 can be easily disposed at a predetermined position of the substrate 10. A photo-curing resin is used as a material for forming the spacer 21. Accordingly, it becomes easy to accurately form the spacers 21 into a predetermined shape and accurately dispose the plurality of spacers 21 at predetermined positions.

  In this example, water is used as a heat source for the heater 50. Therefore, the heat accumulator 1 is not exposed to an excessively high temperature and is used under a relatively mild temperature condition. Thereby, although the base material 10 and the spacer 21 are resin, the heat storage device 1 has sufficient reliability.

  In this example, the mandrel 11 is used as a winding shaft. However, when the base material 10 provided with the spacer 21 has sufficient rigidity, the mandrel 11 is not used and the base material 10 is wound. Thus, the heat accumulator 1 may be formed.

  In this example, the spacer 21 is disposed on the front side surface 10a of the base material 10, but may be disposed on the back side surface 10b. Moreover, although the base material 10 is wound in the state in which the front side surface 10a faces the axial center side, it may be wound in a state in which the front side surface 10a faces the side opposite to the axial center.

  In this example, the base material 10 is wound before the photo-curing resin as the forming material of the spacer 21 is completely cured, and the upper surface 21b of the spacer 21 and the back side surface 10b of the base material 10 are brought into contact with each other. Then, the upper surface 21b of the spacer 21 and the back side surface 10b of the base material 10 are joined by completely curing the photocurable resin. Instead of this, an adhesive layer may be provided on the back side surface 10b of the base material 10, and the back side surface 10b of the base material 10 and the upper surface 21b of the spacer 21 may be joined via the adhesive layer. The adhesive layer can be formed by applying an adhesive to the back side surface 10 b of the substrate 10. The material of the adhesive forming the adhesive layer can be appropriately selected in consideration of the adhesiveness to the forming material of the base material 10 and the spacer 21 and the required durability and strength.

  In this example, although the base material 10 was laminated | stacked by winding, it replaces with this and prepares the base material 10 with which the spacer 21 was arrange | positioned severally, and the extension direction of the spacer 21 becomes the same as these. May be laminated.

  According to this example, the heat accumulator 1 for a thermoacoustic apparatus having high energy conversion efficiency from heat to sound waves can be provided.

DESCRIPTION OF SYMBOLS 1 Heat accumulator 10 Base material 11 Mandrel 20 Spacer layer 21 Spacer 22 Pore 30 Loop pipe 40 Branch pipe 50 Heater 60 Cooler 70 Linear generator 100 Thermoacoustic device

Claims (3)

A plurality of base materials made of resin thin films are laminated via a spacer layer,
In the spacer layer, a plurality of spacers extending perpendicularly to the stacking direction of the base material and formed over both end portions of the base material are arranged in parallel with each other at equal intervals, and the stacked layers A plurality of linear and non-blocking pores formed by the substrate and the spacers adjacent to each other are formed,
The height of the stacking direction of the spacers state, and are in the range of 50 to 200 [mu] m,
The spacing between the adjacent spacers is in the range of 500 to 2000 μm,
The aperture ratio of the pores is in the range of 70 to 90%,
A thermal accumulator for a thermoacoustic apparatus, wherein the base material and the spacer forming material have a thermal conductivity of 10 W / mK or less .   The heat storage for a thermoacoustic device according to claim 1, wherein the base material is wound and laminated in a roll shape with an axis parallel to a direction in which the plurality of spacers extend as a winding axis. vessel.   The heat accumulator for a thermoacoustic device according to claim 1 or 2, wherein the spacer is formed by printing a curable resin on a surface of the base material.

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