JP2007292326A - Stack and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stack capable of improving energy converting efficiency between sound energy and heat energy and uniformly securing energy converting efficiency of every product. <P>SOLUTION: This stack 3 disposed in a loop pipe 2 and having pores for converting energy between sound energy and heat energy in the loop pipe 2, has plane sheets 31 including natural fiber and resin fiber, and wavy sheets 32 including natural fiber and resin fiber, and these plane sheets 31 and wavy sheets 32 are alternately disposed. The plural sheets of plane sheets 31 composed of natural fiber and resin fiber are adhered/stacked while alternately displacing their adhesion positions, and these sheets are separated from each other to form a conduction passage 30 at the last. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stack used in a thermoacoustic device and the like, and a manufacturing method thereof, and more specifically, a stack that improves the efficiency of energy conversion between thermal energy and sound energy, and the stack It relates to a manufacturing method.

  Thermoacoustic devices are known as devices that cool an object to be cooled by converting energy between sound energy and heat energy.

  For example, Patent Literature 1 below discloses a thermoacoustic apparatus that can cool an object to be cooled using waste heat of a factory or the like. As shown in FIG. 8, the thermoacoustic apparatus is sandwiched between a loop pipe 20 enclosing a working fluid and a high temperature side heat exchanger 40 and a low temperature side heat exchanger 50 provided on one side of the loop pipe 20. The first stack 30 a and the second stack 30 b sandwiched between the high temperature side heat exchanger 60 and the low temperature side heat exchanger 70 provided on the other side of the loop pipe 20 are provided.

  The outline of the principle of such a thermoacoustic apparatus will be described. When the high-temperature side heat exchanger 40 on the first stack 30a side is heated and the low-temperature side heat exchanger 50 is cooled, the thermoacoustic apparatus is automatically turned from the first stack 30a. A sound wave of excitation is generated. This self-excited sound wave has been known for a long time as the phenomenon of Naruto in Kibitsu Shrine and the phenomenon of air column resonance in the Reike tube. When the self-excited sound wave is generated in this way, the sound wave propagates in the loop tube as a standing wave and a traveling wave, and is transferred as sound energy into the second stack 30b provided on the opposite side of the loop tube 20. Is done. Then, the sound energy passes through the porous conduction path formed in the second stack 30b, and the working fluid is expanded and contracted in the conduction path. Then, the working fluid exchanges heat with the wall surface of the second stack 30b by repeating the expansion and contraction operations of the working fluid, and heat is transferred in the direction opposite to the transfer direction of the sound energy. And the heat | fever by the side of the low temperature side heat exchanger 70 is taken by the transfer of the heat, and the external cooling target object is cooled using the low temperature side heat exchanger 70. Here, “stack” refers to a heat accumulator, a regenerator, a regenerator, a heat exchanger, etc. having a porous hole penetrating inside, and a device in which the fluid in the porous can exchange heat with the wall surface. Or device.

  By the way, as a stack | stuck used with such a thermoacoustic apparatus, what is shown by the following literature is known.

  For example, Patent Document 2 below discloses a stack in which a plurality of plates are formed by a heat transfer body such as aluminum, an aluminum alloy, or ceramics, and these are stacked.

  Non-Patent Document 1 below describes a stack in which honeycomb-shaped ceramics and stainless steel plates are laminated at very narrow intervals, a stack in which a wire mesh or abrasive paper is wound in a roll shape, and a stack in which straws and ceramic glass tubes are bundled. Etc. are disclosed.

  Furthermore, in Patent Document 1 and Patent Document 3 below, a material having a large heat capacity such as ceramics, sintered metal, wire mesh, metal nonwoven fabric, and the like, a porous stack penetrating in the axial direction of the loop tube, A stack that forms a meandering conduction path by spreading spherical ceramics or the like is disclosed.

  However, among these stacks, a stack made of metal, ceramics, or the like is generally formed by injection molding, so that it is difficult to form a micro shape. That is, when trying to reduce the hole diameter, there is a possibility that the material extruded at a high temperature at the time of injection closely adheres within the hole and clogs. And since the wall surface of the conduction path formed by injection molding is in a smooth state, the contact area with the working fluid is reduced, and the energy conversion efficiency is not good.

  On the other hand, the following patent document 4 proposes a stack using a random fiber material such as absorbent cotton. In this stack, the absorbent cotton is compressed to a desired thickness (for example, 0.5 cm), thereby forming a meandering conduction path to improve the heat exchange rate.

However, when a stack is formed by compressing a random fiber material such as absorbent cotton, the formation state of the conduction path is changed for each stack, so that a uniform heat exchange rate cannot be guaranteed for each product. Even if the compression rate is constant, the heat exchange rate may change due to compression when transporting or mounting in a pipe. Furthermore, when the compression ratio of the stack is increased, the conduction path in the absorbent cotton may be blocked, and conversely, the heat energy may be deteriorated by blocking the passage of sound energy.
JP-A-2005-274100 Japanese Patent Application Laid-Open No. 08-014679 JP 2005-274099 A Special Table 2004-534195 No. 95-1 WS6- (5) “Effect of stack in thermoacoustic refrigeration”, WS6- (4) “Outline of thermoacoustic refrigeration”

  Accordingly, the present invention has been made paying attention to the above problems, and provides a stack capable of improving the energy conversion efficiency between sound energy and heat energy and uniformly ensuring the energy conversion efficiency for each product. The purpose is to do.

  That is, in order to solve the above problems, the present invention provides a planar sheet formed of a fibrous material in a stack that is provided in a tube and has a porosity that converts energy between sound energy and heat energy in the tube. And a wavefront sheet formed of a fibrous substance, and the porous sheet is formed by alternately providing the planar sheet and the wavefront sheet.

  In this way, since the inner wall of the hole is formed by the sheet formed of the fibrous material, there is no risk of clogging in the hole as compared with the case where the hole is formed by injection molding. A pore having a small diameter can be formed. In addition, since the sheet is formed of a fibrous material, the surface becomes rough, the contact area between the inner wall of the hole and the working fluid increases, and the energy conversion efficiency is improved. Furthermore, the energy conversion efficiency for each product can be made uniform.

  Moreover, in such an invention, a porous is formed by winding up a pair of laminated planar sheets and wavefront sheets.

  And a stack is formed by laminating | stacking a pair of planar sheet | seat and a wave surface sheet | seat, and winding up the laminated | stacked sheet | seat.

  In this way, the size of the hole diameter can be determined in advance according to the shape of the wavefront sheet, and moreover, a plurality of holes can be formed simply by laminating the sheet on the planar sheet. Formation and size determination can be easily performed.

  Further, in another invention, in a stack having a porosity provided in a tube and performing energy conversion between sound energy and thermal energy in the tube, a plurality of wavefront sheets formed of a fibrous material form the porosity. To do.

  And when forming such a stack, the process of apply | coating an adhesive to the upper surface of the planar sheet formed of the fibrous substance linearly and at equal intervals, and another planar sheet on the upper surface of the planar sheet A step of laminating and adhering, a step of applying an adhesive in a straight line to an upper surface of the bonded flat sheet at an intermediate position with a lower bonded portion, and another flat sheet on the upper surface of the adhesive And laminating a plurality of the laminated sheets in the normal direction by separating the plurality of laminated sheets in a normal direction. Form.

  According to such an invention, it is possible to form a uniform-sized pore only by pulling in the normal direction after bonding the flat sheets.

  In the present invention, in a stack having a porosity that is provided in a tube and converts energy between sound energy and thermal energy in the tube, the porosity is formed by using a planar sheet formed of a fibrous material. Therefore, it is possible to form a large number of pores having a small diameter as compared with the case where the pore is formed by injection molding. Moreover, since a fibrous substance is used, the contact area between the inner wall of the hole and the working fluid can be increased, energy conversion efficiency can be improved, and energy conversion efficiency for each product can be made uniform. Can do.

  Hereinafter, an embodiment of a thermoacoustic apparatus 1 according to the present invention will be described with reference to the drawings.

  The stack 3 (3a, 3b) in this embodiment is used in the thermoacoustic apparatus 1 that exchanges energy between sound energy and heat energy in the loop tube 2. As shown in FIG. 1, the thermoacoustic apparatus 1 includes a loop tube 2 configured in a substantially rectangular shape as a whole, a first heat exchanger 300 and a second heat exchanger 300 provided at two locations inside the loop tube 2. The heat exchanger 310 is configured. The first heat exchanger 300 is configured by adhering the first high temperature side heat exchanger 4, the first stack 3a, and the first low temperature side heat exchanger 5 in order from the top, The heat exchanger 310 side is also configured by bringing the second high temperature side heat exchanger 6, the second stack 3b, and the second low temperature side heat exchanger 7 into close contact with each other. Then, by heating the first high temperature side heat exchanger 4 on the first heat exchanger 300 side and cooling the first low temperature side heat exchanger 7, self-excited sound waves are generated from the first heat exchanger 300. Then, the standing wave and traveling wave of this sound wave are transferred along the loop tube 2 to the second heat exchanger 310 side. Then, on the second heat exchanger 310 side, the heat energy is transferred in the direction opposite to the sound energy transfer direction to cool the second low temperature side heat exchanger 7.

  The configuration of the thermoacoustic device 1 will be specifically described. The loop tube 2 constituting the thermoacoustic device 1 includes a pair of straight tube portions 2a and a connecting tube portion 2b that connects these straight tube portions 2a. Configured. These straight tube portions 2a and connecting tube portions 2b are made of a metal pipe, transparent glass, resin, or the like. Of these, when transparent glass or resin is used, the position of the first stack 3a and the second stack 3b and the state in the tube can be visually confirmed, and the glass or resin is relatively In the case of a material having a low thermal conductivity, the cooling efficiency can be increased without conducting the heat heated on the first heat exchanger 300 side to the second heat exchanger 310 side.

  The loop tube 2 is filled with an inert gas such as helium or argon, and the internal pressure is set to a value such as 0.01 MPa to 5 MPa. In addition, nitrogen, air, etc. may be sufficient as these working fluids enclosed.

  When enclosing such a working fluid, helium or the like having a small Prandtl number and a small specific gravity is used. In this way, the time until the generation of sound waves can be shortened. However, when such a working fluid is used, the speed of sound increases and heat exchange cannot be performed with the inner wall of the stack. On the other hand, if argon or the like having a large Prandtl number and a large specific gravity is used, this time, the viscosity becomes so high that sound waves cannot be generated quickly. For this reason, it is preferable to use a mixed gas of helium and argon. Such a mixed gas is sealed as follows.

  First, helium having a small Prandtl number and a small specific gravity is sealed in the loop tube 2 to quickly generate sound waves. Then, in order to reduce the sound velocity of the generated sound wave, a gas having a large Prandtl number and a large specific gravity such as argon is injected. When mixing argon, as shown in FIG. 1, a helium gas injection device 9a and an argon gas injection device 9b are provided in the central portion of the connecting pipe portion 2b provided on the upper side, and argon is injected therefrom. Then, argon is uniformly separated into the left and right straight tube portions 2a and mixed with the internal helium downward. The pressure of these mixed gases is set to 0.01 MPa to 5 MPa.

  Next, the configuration of the first heat exchanger 300 and the second heat exchanger 310 provided inside the loop pipe 2 will be described. The first high temperature side heat exchanger 4, the first low temperature side heat exchanger 5, the second high temperature side heat exchanger 6, and the second low temperature side heat exchanger 7 are all made of a metal having a large heat capacity. Then, a small-diameter conduction path 30 penetrating in the axial direction of the loop pipe 2 is provided inside thereof so as to allow the working fluid to pass therethrough. Of these first high temperature side heat exchanger 4 and first low temperature side heat exchanger 5, the first high temperature side heat exchanger 4 on the first heat exchanger 300 side is in contact with the upper surface of the first stack 3a. For example, it is heated to about 250 ° C. to 750 ° C., for example, using electric power supplied from the outside, waste heat from a factory, unused waste heat such as automobile waste heat, and the like.

  On the other hand, the first low temperature side heat exchanger 5 is attached so as to be in contact with the lower surface of the first stack 3a, and a cooling circulator 8 for circulating the coolant is attached to the outer peripheral portion thereof. And it sets to low temperature rather than the 1st high temperature side heat exchanger 4, for example, is set to normal temperature, such as 15 to 16 degreeC. The temperatures of the first high temperature side heat exchanger 4 and the first low temperature side heat exchanger 5 are not limited to such temperatures, but the type, pressure, inner diameter, and length of the working fluid in the loop pipe 2. It is set to an optimum value depending on the state of other elements such as the size.

  Next, the 2nd high temperature side heat exchanger 6 in the 2nd heat exchanger 310 side is attached so that it may closely_contact | adhere to the upper side of a 2nd stack, and it is more relative than the 2nd low temperature side heat exchanger 7 mentioned later. Set to high temperature. The temperature of the second high temperature side heat exchanger 6 is set to 15 ° C. to 16 ° C., for example. When setting the temperature of the second high temperature side heat exchanger 6, the temperature is set substantially the same as that of the first low temperature side heat exchanger 5 using the cooling circulator 8 attached around the first low temperature side heat exchanger 5. Set.

  The second low temperature side heat exchanger 7 provided on the second heat exchanger 310 side converts sound energy generated in the loop pipe 2 into heat energy, and cools the heat generated by the transfer of the heat energy. Output to the outside. Then, the external cooling object is cooled by this output. The cooling temperature is cooled to about minus 30 degrees depending on the pressure of the working fluid in the loop pipe 2 and the state of heating.

  Furthermore, in this embodiment, the following configuration is used as the first stack 3a and the second stack 3b. In this embodiment, the first stack 3a and the second stack 3b are collectively described as “stack 3”, but may have different configurations.

  First, these stacks 3 are formed in a cylindrical shape inscribed in the loop tube 2, and are configured using a large number of sheets formed of a fibrous material. Here, the sheet is an aggregate of inorganic or organic fibrous substances, specifically, silica, alumina-based ceramic fibers, glass fibers, Fe, Cu, Al, Cr, Ni, etc. Metal fibers made from metal, chemical fibers such as acrylic, polyethylene, polypropylene, polyurethane, polyclar, nylon, rayon, vinylon, vinylidene, polyvinyl chloride, acetate, polyester, and natural fibers such as cellulose, silk, and cotton Further, it is made of carbon fiber, silicon carbide fiber or the like, and is a planar or wavefront member obtained by making paper with these fibrous materials together with pulp or organic / inorganic binder. This sheet has a rough surface. For example, when a droplet is dropped on the surface, the inner angle on the droplet side is 30 to 80 degrees. Of these materials, heat resistance is required at a portion where heat of 100 ° C. or higher is applied, and therefore, an inorganic fibrous material is preferable as the material, and ceramic fibers are particularly preferable. The diameter of the ceramic fiber is usually in the range of 1 to 10 μm. The thickness of each sheet is preferably 0.04 to 0.20 mm, and more preferably 0.05 to 0.15 mm. When the thickness of the sheet is 0.04 mm or less, it is difficult to form a conduction path because the strength of the sheet is weak, and when the thickness is 0.2 mm or more, the opening area ratio may be reduced and the system efficiency may be deteriorated. is there.

  Next, the configuration of the stack 3 in the first embodiment will be described with reference to FIG.

  First, as shown in FIG. 4, the stack 3 in the first embodiment is formed by alternately laminating a planar sheet 31 configured in a planar shape and a wavefront sheet 32 configured in a wavefront, and thereafter A plurality of stacked sheet groups 31 and 32 are cut into a cylindrical shape in accordance with the inner diameter dimension of the loop tube 2, and the periphery is surrounded by the planar sheet 31. The wavefront sheet 32 is a sine wave sheet or a triangular wave sheet, and the pitch is 0.5 to 4.0 mm and the wave height is 1.0 to 5.0 mm. It is preferable that the pitch is less than 0.5 mm, and the wave height is in the range of 1.2 to 4.0 mm. When the pitch is less than 0.5 mm and the wave height is less than 1 mm, it is difficult to form a conduction path. On the other hand, when the pitch exceeds 4 mm and the wave height exceeds 5 mm, heat or The contact efficiency of the sonic wave is deteriorated and as a result, the system performance is deteriorated. The number of cells is usually 100 to 2000 cells / in 2, preferably 300 to 1500 cells / in 2, more preferably 400 to 1000 cells / in 2.

  When laminating these sheets alternately, first, an adhesive is applied to the wavefront upper end portion and the lower end portion of the wavefront sheet 32, and then laminated on the planar sheet 31 to be bonded. Further, the planar sheet 31 is further laminated on the upper surface, and thereafter the wavefront sheet 32 and the planar sheet 31 are alternately laminated in the same manner. And finally, it cut | disconnects according to the shape in the state which became equal to the internal diameter of the loop pipe | tube 2, and the circumference | surroundings are enclosed by the planar sheet | seat 31. FIG.

  Next, the stack 3 in the second embodiment will be described with reference to FIG.

  The stack 3 in the second form is configured by alternately laminating planar sheets 31 and wavefront sheets 32 similar to the stack 3 in the first form. However, in this embodiment, a pair of planar sheets 31 and a wavefront sheet 32 are laminated and bonded, and then the pair of sheets are rolled up to form a columnar shape equal to the inner diameter of the loop tube 2. When such a stack 3 is used, the number of steps for stacking is small, and the step of cutting into a cylindrical shape is not necessary, so that the columnar stack 3 can be easily configured.

  Next, the stack 3 in the third embodiment will be described with reference to FIG.

  In the stack 3 in the third embodiment, a linearly parallel adhesive portion 33 is formed on the surface of the planar sheet 31 described in the first embodiment, and another planar sheet 31 is laminated thereon. To do. Then, on the upper surface of the laminated planar sheet 31, this time, an adhesive is applied to an intermediate position between the adhesive portion 33 and the adhesive portion 33 to form a parallel linear adhesive portion 33. The other planar sheet 31 is laminated thereon. Thereafter, similarly, the planar sheets 31 are laminated while alternately shifting the bonding portions 33, and finally, the upper surface sheet and the lower surface sheet are separated to form the linear conduction path 30 in the non-bonding portion. To do. According to the third embodiment, since the adhesive is applied to the planar sheet 31 when the sheets are bonded, the operation of applying the adhesive can be simplified.

  Next, the stack 3 in the fourth embodiment will be described with reference to FIG.

  As in the stack 3 in the third embodiment, the stack 3 in the fourth embodiment is laminated while adhering a plurality of planar sheets 31, and then the sheets are separated from both sides. Thus, a conduction path 30 is formed between the sheets. Characteristically, in the fourth embodiment, the application width of the adhesive is wider than that of the third embodiment and has a constant width. First, when bonding each sheet | seat, an adhesive agent is apply | coated to linear form so that it may have a fixed width | variety on the upper surface of the planar sheet | seat 31, and the parallel several adhesion part 33 is formed. At this time, the width of each bonding portion 33 and the width of the non-bonding portion are set so that the width of the non-bonding portion is about three times the width of the bonding portion 33. And after forming the adhesion part 33 with these space | intervals and adhere | attaching the planar sheet | seat 31, it is an intermediate position of the adhesion | attachment part 33 just before on the upper surface of the laminated | stacked planar sheet | seat 31, and is the same. An adhesive portion 33 having a width is formed. That is, on the front and back sides of the laminated planar sheet 31, the back-side adhesive portion 33, the non-adhesive portion 33, the front-side adhesive portion 33, the non-adhesive portion 33, and the back-side adhesive portion 33 are alternately alternated with the same width. Make it come. Then, the planar sheets 31 are sequentially laminated and bonded in this way, and finally, the planar sheet 31 on the uppermost surface side and the planar sheet 31 on the lowermost surface side are separated from each other to the non-adhesive portion between the sheets. A conduction path 30 is formed. As a result, a honeycomb-shaped conduction path 30 is formed between the planar sheets 31.

Next, FIG. 2 demonstrates the effect | action of the 1st heat exchanger 300 containing the stack | stuck 3 comprised in this way.
When the first high temperature side heat exchanger 4 of the first heat exchanger 300 is heated and the first low temperature side heat exchanger 5 is cooled, the first high temperature side heat exchanger 4, the first low temperature side heat exchanger 5, A temperature gradient is formed, and the working fluid in the conduction path 30 of the first stack 3a undergoes a cycle of compression → heating → expansion → cooling, and performs heat exchange along the wall having a temperature gradient. Repeat reciprocating motion. At this time, since the wall surface in the conduction path 30 has a rough surface shape containing non-metallic fibers, the area for exchanging heat with the working fluid increases, and self-excited sound waves are generated while efficiently exchanging heat. .

  The generated sound waves are transferred to the second heat exchanger 310 side as sound energy by standing waves and traveling waves.

  On the second heat exchanger 310 side receiving the sound energy, the working fluid in the second stack 3b is expanded and compressed based on the standing wave and the traveling wave. As shown in FIG. 3, the working fluid in the conduction path 30 of the second stack 3b repeats a cycle of compression → cooling → expansion → heating in a process reverse to the cycle in the first stack 3a. At this time, the wall surface of the stack 3 in the conductive path 30 is a rough surface containing non-metallic fibers, so that the surface area for exchanging heat with the working fluid increases, and the wall surface of the stack 3 while efficiently exchanging heat. To accumulate heat. Then, the heat energy exchanged at that time is transferred in the direction opposite to the sound energy transfer direction, that is, from the second low temperature side heat exchanger 7 to the second high temperature side heat exchanger 6 side, and the second high temperature side heat is transferred. High heat is accumulated on the exchanger 6 side, and low heat is accumulated on the second low temperature side heat exchanger 7 side. The high-temperature heat transferred to the second high-temperature side heat exchanger 6 side is deprived of heat by the cooling circulator 8 provided in the surroundings, and the heat gradually becomes the second high-temperature side heat exchanger. It is transferred to the 6 side, and the second low temperature side heat exchanger 7 is cooled. Thereby, the cooling object can be cooled by taking out the cold heat of the second low-temperature side heat exchanger 7.

  As described above, according to the above-described embodiment, in the stack 3 provided in the loop pipe 2 and having the porosity in which energy conversion is performed between the sound energy and the heat energy in the loop pipe 2, natural fibers and resin fibers are used. It has the planar sheet 31 to contain, and the wave surface sheet 32 containing a natural fiber or a resin fiber, and the conduction path 30 is formed by providing these planar sheets 31 and the wave surface sheet 32 alternately. Therefore, as compared with the conventional case where the conduction path 30 is formed by injection molding, there is no fear of clogging in the hole even if a small hole is provided, and a large number of conduction paths 30 are surely formed. be able to. And since the sheet | seat becomes the rough surface shape comprised with the nonmetallic fiber, while being able to enlarge the contact area of the inner wall of the conduction path 30, and a working fluid, it can improve energy conversion efficiency, and is the same for every stack 3 The energy conversion efficiency in can be made uniform.

  In such an invention, since the stack 3 having the plurality of conductive paths 30 is formed by winding up the pair of laminated planar sheets 31 and wavefront sheets 32, the lamination process of each sheet or The cutting operation is simplified, and the stack 3 can be easily formed. In addition, the shape of the conduction path 30 can be determined in advance at the stage of making the sheet into a wavefront shape, and the shape of the conduction path 30 can be easily determined.

  In another invention, a plurality of planar sheets 31 composed of natural fibers, resin fibers, and the like are bonded and stacked while alternately shifting the bonding positions, and finally, the conductive paths 30 are separated by separating the sheets. Since it is formed, the conductive path 30 having a uniform size can be formed simply by pulling in the normal direction after bonding the planar sheet 31.

  In addition, this invention is not limited to the said embodiment, It can implement in a various aspect.

  For example, in the above embodiment, the loop tube 2 is used to perform energy conversion between sound energy and heat energy. However, the present invention is not limited to the loop tube 2, but is a linear pulse tube or other shape tube. Can also be used. Further, the cross-sectional shape of the tube is not limited to a tube having a circular cross section, and may be a rectangular cross section.

  Moreover, in the said embodiment, although the planar sheet | seat 31 and the wave surface sheet | seat 32 are adhere | attached alternately, you may make it laminate | stack without adhering each sheet | seat. In this case, it is preferable that the planar sheet 31 and the wavefront sheet 32 are laminated without being bonded, cut into a columnar shape, and then wrapped around the planar sheet 31. In this case, since the bonding step is not required, the stack 3 can be easily formed, and there is no worry of clogging due to the protruding adhesive.

  Furthermore, in the said embodiment, although the sheet | seat is comprised with a nonmetallic fiber, along with the direction of the conduction path 30, the fiber with relatively high heat conductivity is arranged in a straight line, and this highly heat conductive fiber is arranged. The heat accumulated in the stack 3 may be quickly transferred to the high temperature side heat exchanger. In this case, the high thermal conductive fiber may be a non-metallic fiber or a metallic fiber, but the surface of the sheet is as rough as possible.

  In addition, in the above embodiment, the conductive sheet 30 is formed by laminating the planar sheet 31 and the wavefront sheet 32, or by partially bonding and separating the planar sheet 31. Alternatively, the conduction path 30 may be formed by alternately laminating a plurality of wavefront sheets 32.

  In the above embodiment, the first stack 3a and the second stack 3b are described as having the same configuration, but the configurations of the first stack 3a and the second stack 3b are different from each other. It may be. In this case, on the first stack 3a side, a configuration with high energy conversion efficiency from heat energy to sound energy is adopted, and on the second stack 3b side, energy conversion efficiency from sound energy to heat energy is good. The configuration should be adopted.

The figure which shows the outline | summary of the thermoacoustic apparatus in one embodiment of this invention. The figure which shows the state of the working fluid in the stack in the same form The figure which shows the state of the working fluid in the stack in the same form The figure which shows the structure of the stack in 1st embodiment. The figure which shows the structure of the stack in 2nd embodiment. The figure which shows the structure of the stack in 3rd embodiment. The figure which shows the structure of the stack in 4th embodiment. The figure which shows the external appearance of the conventional thermoacoustic apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Thermoacoustic apparatus 2 ... Loop pipe 2a ... Straight pipe part 2b ... Connection pipe part 3 (3a, 3b) ... Stack 4 ... First high temperature side heat exchanger 5- .... First low temperature side heat exchanger 6 ... second high temperature side heat exchanger 7 ... second low temperature side heat exchanger 8 ... cooling circulator 9a ... helium gas injection device 9b ... Argon gas injection device 30 ... conducting path 300 ... first heat exchanger 310 ... second heat exchanger 31 ... planar sheet 32 ... wavefront sheet 33 ... bonded portion

Claims (6)

In a stack having a porosity provided in a tube and performing energy conversion between sound energy and heat energy in the tube,
Having a planar sheet formed of a fibrous material and a wavefront sheet formed of a fibrous material, and forming the pores by alternately providing the planar sheet and the wavefront sheet A stack characterized by.   The stack according to claim 2, wherein a porous layer is formed by winding a pair of laminated planar sheets and wavefront sheets. In a method for manufacturing a stack having a porosity provided in a tube and performing energy conversion between sound energy and heat energy in the tube,
A step of alternately laminating a planar sheet formed of fibrous material and a wavefront sheet formed of fibrous material, and a step of cutting the plurality of laminated sheets along the inner diameter of the tube A method for manufacturing a stack, comprising: In a method for manufacturing a stack having a porosity provided in a tube and performing energy conversion between sound energy and heat energy in the tube,
A step of laminating at least a pair of planar sheets and wavefront sheets formed of a fibrous material, and a step of forming a plurality of the laminated sheets into a cylindrical shape along the inner diameter of the tube. A manufacturing method of a stack characterized by the above. In a stack having a porosity provided in a tube and performing energy conversion between sound energy and heat energy in the tube,
A stack characterized in that a plurality of wavefront sheets made of a fibrous material form a pore. In a method for manufacturing a stack having a porosity provided in a tube and performing energy conversion between sound energy and heat energy in the tube,
Applying an adhesive in a straight line and at equal intervals on the upper surface of a planar sheet formed of a fibrous material;
Laminating and bonding another planar sheet on the upper surface of the planar sheet;
A step of applying an adhesive in a straight line to the upper surface of the bonded planar sheet at an intermediate position with the lower layer bonding portion;
A step of laminating and bonding another planar sheet on the upper surface of the adhesive;
Repeating the above steps and sequentially laminating planar sheets;
And a step of forming a hole in the non-adhered portion by separating the plurality of stacked sheets in the normal direction.

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