JP2015121361A - Stack of thermoacoustic device, and thermoacoustic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stack of a thermoacoustic device which can prevent heat of a stack body from being transmitted to an outer peripheral member surrounding the outside thereof.SOLUTION: A sound pressure generating part 20 of a thermoacoustic device includes: a stack 30 where a temperature gradient is formed; an endothermic container 22 as a first heat exchanger which transmits heat to the stack 30; and a heat radiator 24 as a second heat exchanger which receives heat transmitted to the stack 30 from the endothermic container 22. The stack 30 includes: a stack body 33 where a plurality of through passages allowing working fluid to run through are disposed in parallel; and an outer peripheral member 35 which corresponds to a metal tube member surrounding the outside of the stack body 33. A heat-insulating space 37 is formed between the stack body 33 and the outer peripheral member 35.

Description

  Embodiments described herein relate generally to a thermoacoustic apparatus that performs energy conversion using a thermoacoustic phenomenon, and more particularly, to a peripheral structure of a stack constituting the thermoacoustic apparatus.

  In general, a thermoacoustic device has a large number of passages through which a working fluid flows between a heat absorber that is a heat exchanger that receives supply of heat and a heat radiator that is a heat exchanger that radiates heat. Things (hereinafter referred to as stacks) are provided. In the stack, for example, when a temperature gradient is formed in the wall that defines the passage through which the working fluid flows, for example, the temperature becomes higher as it goes from the radiator side to the heat absorber side, the working fluid repeatedly expands and contracts in the passage, A sound pressure is generated in the working fluid. By converting the heat energy from the heat absorber into acoustic energy in such a stack, the energy can be transported to the cold heat generator or the generator via the working fluid.

  The thermoacoustic apparatus provided with such a stack has a so-called straight pipe type in which the path of the pipe extending from the stack is configured in a straight line, and the path of the pipe is configured in a substantially annular shape. There is a so-called loop tube type.

JP 2012-202586 A

  In the stack as described above, in order to form a large number of fine passages, a part constituting the wall body (hereinafter referred to as a stack body) defining the passages may be made of ceramics, for example. is there. In such a case, on the outside of the stack main body, a tubular member (hereinafter simply referred to as an “outer peripheral member”) that surrounds the outside of the stack main body between heat exchangers such as a heat absorber and a heat radiator is provided to protect this. May be provided). It is conceivable that such an outer peripheral member is made of a metal that is relatively easy to manufacture, like the pipe extending from the stack.

  On the other hand, when the thermal conductivity of the outer peripheral member is high in such a stack, the heat transferred from the heat absorber to the stack main body is transferred from the stack main body to the radiator via the outer peripheral member, and the stack main body is desired. It is conceivable that the temperature gradient cannot be formed. Therefore, in the stack that constitutes the thermoacoustic device, a technique for suppressing the heat of the stack body from being transmitted to the outer peripheral member is required.

  Then, embodiment of this invention aims at providing the stack | stuck of the thermoacoustic apparatus which can suppress that the heat | fever of a stack main body is transmitted to the outer peripheral member which surrounds the outer side.

  In order to achieve the above object, the stack of the thermoacoustic device according to the embodiment of the present invention is a stack provided between the first heat exchanger and the second heat exchanger to form a temperature gradient, A stack main body in which a plurality of through passages through which a working fluid can flow are arranged in parallel; and an outer peripheral member that is a metal tubular member surrounding the outside of the stack main body, the stack main body and the outer peripheral member; A space for heat insulation that can suppress the heat of the stack body from being transmitted to the outer peripheral member is formed between the two.

  In addition, the thermoacoustic device of the embodiment of the present invention is transmitted to the stack from which the temperature gradient is formed, the first heat exchanger that transmits heat or cold to the stack, and the first heat exchanger. A second heat exchanger that receives heat or cold, and the stack includes a stack body in which a plurality of through passages through which a working fluid can flow are arranged in parallel, and a metal tube that surrounds the outside of the stack body A heat insulating space capable of suppressing the heat of the stack main body from being transmitted to the outer peripheral member is formed between the stack main body and the outer peripheral member. It is characterized by being.

  According to the embodiment of the present invention, it is possible to suppress the heat of the stack body from being transferred to the outer peripheral member.

It is a schematic diagram which shows an example of the thermoacoustic apparatus to which the stack | stuck of embodiment is applied, and shows the structural example of what is called a straight-pipe type thermoacoustic apparatus in which the path | route of the piping filled with a working fluid makes a substantially linear shape. Yes. It is a schematic diagram which shows the other example of the thermoacoustic apparatus to which the stack | stuck of embodiment is applied, and shows the structural example of what is called a loop type thermoacoustic apparatus in which the path | route of piping filled with a working fluid makes a substantially cyclic | annular form. Yes. It is a longitudinal cross-sectional view which shows the stack of 1st Embodiment, and its peripheral structure. It is a cross-sectional view of the stack of the first embodiment, and is a cross-sectional view taken along the line IV-IV in FIG. It is a cross-sectional view of the stack of the second embodiment. It is a longitudinal cross-sectional view which shows the stack of 3rd Embodiment, and its peripheral structure. It is a cross-sectional view of the stack of the third embodiment, and is a cross-sectional view taken along line VIII-VIII in FIG. It is a longitudinal cross-sectional view which shows the stack of 4th Embodiment, and its peripheral structure. It is a cross-sectional view of the stack of the fourth embodiment, and is a cross-sectional view taken along the line XX of FIG. It is a longitudinal cross-sectional view which shows the stack | stuck of 5th Embodiment, and its peripheral structure. It is a cross-sectional view of the stack of the fifth embodiment, and is a cross-sectional view taken along line XII-XII in FIG.

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

[Schematic configuration of thermoacoustic device]
First, an example of a schematic configuration of a thermoacoustic apparatus to which the stack of this embodiment is applied will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram showing an example of a thermoacoustic apparatus to which the stack of the present embodiment is applied. A so-called straight pipe type thermoacoustic apparatus in which a path of a pipe filled with a working fluid is substantially linear. A configuration example is shown. FIG. 2 is a schematic view showing another example of a thermoacoustic apparatus to which the stack of the present embodiment is applied, and is a so-called loop-type thermoacoustic apparatus in which a path of a pipe filled with a working fluid is substantially annular A configuration example is shown.
(Configuration example of straight pipe type thermoacoustic device)
As shown in FIG. 1, the thermoacoustic apparatus 10 according to this configuration example includes a sound pressure generation unit 20 that converts thermal energy into acoustic energy, and cold heat that receives acoustic energy generated in the sound pressure generation unit 20 and generates cold. And a generator 80. The thermoacoustic apparatus 10 is configured as a so-called thermoacoustic refrigerator in which the cold heat generating unit 80 receives acoustic energy and generates cold.

  The sound pressure generator 20 includes a heat exchanger (hereinafter referred to as a heat absorber) 22 that receives heat supplied from outside the thermoacoustic device 10, and a heat exchanger (hereinafter referred to as heat sink) that radiates heat to the outside of the thermoacoustic device 10. 24) and a stack 30 that is sandwiched between the heat absorber 22 and the heat radiator 24 and transmits heat from the heat absorber to the working fluid to generate sound pressure in the working fluid. doing. That is, one end of the stack 30 is coupled to the high-temperature heat absorber 22, and the other end is coupled to the heat radiator 24 having a lower temperature than the heat absorber 22. The radiator 24 is at a temperature equal to or slightly higher than the outside air. A value obtained by multiplying the sound pressure by the particle velocity of the working fluid is acoustic energy.

  On the other hand, the cold heat generating unit 80 receives acoustic energy to generate cold heat, a heat exchanger 84 that is a heat exchanger coupled to the sound pressure generating unit 20 side of the stack 82, and sound pressure generation of the stack 82. It has the cooler 86 which is a heat exchanger couple | bonded with the part 20 and the other side. In other words, one end of the stack 82 is coupled to a cooler 86 having a low temperature, and the other end is coupled to a radiator 84 having a higher temperature than the cooler 86. The radiator 84 is at a temperature that is equal to or slightly lower than the outside air.

  The sound pressure generating unit 20 and the cold heat generating unit 80 are coupled via a substantially cylindrical central pipe 14. An end pipe 12 having a substantially cylindrical shape with one end closed is coupled to the sound pressure generating unit 20 on the side opposite to the cold heat generating unit 80. On the other hand, a substantially cylindrical pipe 16 is coupled to the cold heat generating unit 80 on the side opposite to the sound pressure generating unit 20. Among the piping 16, the cold generator 80 (ie, the cooler 86, the stack 82, the radiator 84), the central pipe 14, the sound pressure generator 20 (ie, the radiator 24, the stack 30, the heat absorber 22), and the end pipe 12 Is filled with a working fluid, and is configured to be able to propagate a sound pressure that is a dense wave of the working fluid. For example, air is used as the working fluid.

  In the thermoacoustic device 10 configured as described above, when the heat absorber 22 of the sound pressure generator 20 is supplied with heat and becomes higher in temperature than the heat radiator 24, the heat of the heat absorber 22 passes through the stack 30. And transmitted to the radiator 24. As a result, a temperature gradient is generated in the stack 30 that increases in temperature from the radiator 24 side toward the heat absorber 22 side. In a state where such a temperature gradient is generated, the stack 30 exchanges heat with a working fluid in a plurality of passages (not shown) formed therein. At this time, since the working fluid in the passage of the stack 30 repeats expansion and compression, sound pressure is generated in the working fluid. The internal structure of the stack 30 will be described later.

  The acoustic energy generated by the stack 30 travels through the working fluid in the central pipe 14 and reaches the stack 82 of the cold heat generating unit 80. The stack 82 has a plurality of passages (not shown) formed therein, and performs heat exchange with the working fluid in the passages. At this time, since the working fluid in the passage of the stack 82 receives acoustic energy and repeats compression and expansion, the passage in the stack 82 has a temperature that becomes lower as it goes from the radiator 84 side to the cooler 86 side. A gradient occurs. The cold heat generated in the stack 82 in this way is transmitted to the cooler 86, and the temperature of the cooler 86 is lowered.

In addition, the structural example of the thermoacoustic apparatus to which the stack of this embodiment is applied is not limited to this aspect. Another configuration example of the thermoacoustic apparatus according to the present invention will be described below.
(Configuration example of loop tube type thermoacoustic device)
As shown in FIG. 2, the thermoacoustic device 10 </ b> B of this configuration example includes a sound pressure generation unit 20 that converts thermal energy into acoustic energy, and cold heat that receives acoustic energy generated in the sound pressure generation unit 20 and generates cold heat. And a generator 80. The thermoacoustic device 10 </ b> B is configured as a so-called thermoacoustic refrigerator in which the cold heat generating unit 80 receives acoustic energy and generates cold heat.

  The radiator 24 of the sound pressure generator 20 and the radiator 84 of the cold generator 80 are coupled via a pipe 15 (hereinafter referred to as a radiator-side pipe) 15 whose path is substantially U-shaped. The radiator-side piping 15 is configured so that its cross-sectional area is substantially constant. On the other hand, the heat absorber 22 of the sound pressure generator 20 and the cooler 86 of the cold generator 80 are also coupled via a pipe 17 (hereinafter referred to as a heat absorber side pipe) 17 whose path is substantially U-shaped. ing.

  Among the sound pressure generator 20 (that is, the heat absorber 22, the stack 30, the radiator 24), the radiator side pipe 15, the cold heat generator 80 (that is, the radiator 84, the stack 82, the cooler 86), and the heat absorber side pipe 17 Is filled with a working fluid, and the working fluid can be circulated.

  In the thermoacoustic device 10B configured as described above, when the heat absorber 22 of the sound pressure generating unit 20 is supplied with heat, the temperature of the stack 30 increases from the radiator 24 side toward the heat absorber 22 side. A temperature gradient occurs. At this time, the stack 30 exchanges heat with a working fluid in a plurality of passages (not shown) formed therein, and generates a sound pressure in the working fluid in the passages of the stack 30.

  The acoustic energy generated by the stack 30 mainly travels through the working fluid in the radiator-side pipe 15 and reaches the stack 82 of the cold heat generating unit 80. The stack 82 has a plurality of passages (not shown) formed therein, and performs heat exchange with the working fluid in the passages. At this time, since the working fluid in the passage of the stack 82 receives acoustic energy and repeats compression and expansion, the stack 82 has a temperature gradient that becomes lower in temperature from the radiator 84 side toward the cooler 86 side. .

  The cold generated in the stack 82 in this way is transmitted to the cooler 86, and the temperature of the cooler 86 is lowered. Since the thermoacoustic device 10B is a loop tube type thermoacoustic device in which the flow path of the working fluid forms an annular shape, the working fluid flows from the sound pressure generating unit 20 to the cold heat generating unit 80 via the heat absorber side pipe 17. Furthermore, it flows again through the radiator-side piping 15 to the sound pressure generator 20.

  In the thermoacoustic apparatuses 10 and 10B described above, the stack according to this embodiment can be applied to the sound pressure generation unit 20 and the cold heat generation unit 80, and the details thereof will be described below. In the following description, each embodiment will be described using the sound pressure generator 20 as an example.

[First Embodiment]
The stack according to the first embodiment and its peripheral structure will be described with reference to FIGS. FIG. 3 is a longitudinal sectional view showing the stack of this embodiment and its peripheral structure. FIG. 4 is a cross-sectional view of the stack of this embodiment, and is a cross-sectional view taken along line IV-IV in FIG. In the present embodiment, as an example, a stack provided in the sound pressure generating unit 20 of the loop tube type thermoacoustic apparatus will be described.

  As shown in FIG. 3, the sound pressure generating unit 20 of the thermoacoustic apparatus is a heat absorber 22 that is a high-temperature side heat exchanger and a low-temperature side heat exchanger in order to form a temperature gradient in the stack 30. And a radiator 24. The stack 30 is provided between the heat absorber 22 and the heat radiator 24.

  The stack 30 has a stack body 33 that is a member in which a plurality of passages (hereinafter referred to as through passages) 34 through which a working fluid can flow are arranged. That is, the stack body 33 and the outer peripheral member 35 are provided between the heat absorber 22 and the heat radiator 24, and a temperature gradient that increases in temperature from the heat radiator 24 toward the heat absorber 22 is formed.

  As shown in FIGS. 3 and 4, the stack body 33 of the present embodiment has a substantially cylindrical shape. A plurality of through passages 34 are arranged in parallel in the stack body 33. These through passages 34 extend in the axial direction (indicated by an arrow A in the drawing) so as to penetrate the stack body 33. The stack body 33 is made of ceramics.

  As shown in FIG. 4, the stack body 33 includes a plurality of wall bodies 33a extending in parallel with a predetermined direction, and a plurality of wall bodies 33c extending perpendicularly to the wall bodies. . A through passage 34 that is surrounded by the wall body 33a and the wall body 33c and has a rectangular cross section, more specifically, a square is formed.

  As shown in FIG. 3, the stack body 33 is held by the heat absorber 22 and the heat radiator 24. The heat absorber 22 is formed with a disk-like recess 22 a having substantially the same shape as the first end 42 of the stack body 33. Similarly, the radiator 24 is formed with a disk-like recess 24 a having substantially the same shape as the second end 44 of the stack body 33. The first end 42 is inserted into the recess 22 a of the heat absorber 22, and the second end 44 is inserted into the recess 24 a of the radiator 24, and the stack body 33 is held by the heat absorber 22 and the radiator 24. Is done.

  In the heat absorber 22, a slit 23 that penetrates the heat absorber 22 is formed on the axially outer side of the recess 22 a (on the side opposite to the stack body 33). Similarly, a slit 25 penetrating the radiator 24 is formed on the outer side in the axial direction of the recess 24 a in the radiator 24. The heat absorber side pipe 17 and the radiator side pipe 15 communicate with each other through the slit 23 of the heat absorber 22, the through passage 34 of the stack body 33, and the slit 25 of the radiator 24.

  The heat transferred from the heat absorber 22 to the first end portion 42 is transferred from the second end portion 44 to the radiator 24 via the stack body 33. At this time, in the stack body 33, a temperature gradient is formed in the wall body 33a and the wall body 33c (see FIG. 4) that define the through-passage 34 as the temperature increases from the radiator 24 side toward the heat absorber 22 side. . By performing heat exchange with the working fluid in the through passage 34 in the stack body 33, the working fluid in the through passage 34 repeats expansion and compression, and sound pressure is generated in the working fluid.

  In addition, as shown in FIGS. 3 and 4, the stack 30 includes a tubular member (hereinafter simply referred to as “outer peripheral member”) 35 that surrounds the outside of the stack body 33. The outer peripheral member 35 is a member that forms the exterior of the thermoacoustic device, and the outer surface thereof is indicated by reference numeral 35e. The outer circumferential member 35 has a substantially cylindrical shape centered on the stack body 33 and is provided coaxially with the stack body 33. The outer peripheral member 35 is provided between the heat absorber 22 and the heat radiator 24, the first end surface 35 a is coupled to the heat absorber 22, and the second end surface 35 c is coupled to the heat radiator 24. ing. The outer peripheral member 35 is made of metal, and can be made of, for example, stainless steel, carbon steel, aluminum alloy, or the like.

  Between the stack main body 33 and the outer peripheral member 35, a space 37 (hereinafter referred to as a heat insulating space) 37 that can suppress the heat of the stack main body 33 from being transmitted to the outer peripheral member 35 is formed. In the present embodiment, the heat insulation space 37 is configured as a substantially cylindrical space that surrounds the radially outer side of the stack body 33. The heat insulating space 37 is filled with air. Thereby, an air layer (hereinafter referred to as an air layer) 37 a is provided between the stack body 33 and the outer peripheral member 35. That is, the heat insulating space 37 is filled with air to form an air layer 37a.

  In the stack 30 configured as described above, the heat transmitted from the heat absorber 22 to the stack body 33 can be suppressed from being transmitted from the stack body 33 to the outer peripheral member 35. This makes it easier to form a desired temperature gradient in the stack body.

  As described above, the thermoacoustic apparatus of the present embodiment includes the stack 30 in which the temperature gradient is formed, the heat absorber 22 as the first heat exchanger that transfers heat to the stack 30, and the heat absorber 22 to the stack 30. It has the heat radiator 24 as a 2nd heat exchanger which receives the heat transmitted to. The stack 30 of this embodiment includes a stack body 33 in which a plurality of through passages 34 through which a working fluid can flow are arranged in parallel, and an outer peripheral member 35 that is a metal tubular member that surrounds the outside of the stack body 33. Have.

  Since the heat insulation space 37 is formed between the stack main body 33 and the outer peripheral member 35, it is possible to suppress the heat of the stack main body 33 from being transmitted to the outer peripheral member 35. It becomes easier to form a desired temperature gradient in the stack body 33.

  In addition, the space 37 for heat insulation can employ | adopt various things. For example, you may comprise not as an air layer but as a vacuum layer (henceforth a vacuum layer) 37c.

  When the vacuum layer is used, heat transfer to the outer peripheral member 35 can be suppressed with a heat insulating effect higher than that of the air layer.

[Second Embodiment]
The stack of the second embodiment and its peripheral structure will be described with reference to FIG. FIG. 5 is a cross-sectional view of the stack of this embodiment. In addition, about the structure substantially common to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Also in the stack 30 </ b> C of the present embodiment, a heat insulating space 37 that can suppress the heat of the stack main body 33 from being transmitted to the outer peripheral member 35 is formed between the stack main body 33 and the outer peripheral member 35. . The heat insulating space 37 is configured as a substantially cylindrical space surrounding the radially outer side of the stack body 33.

  A coating film 36 is formed on the inner surface 35 g of the outer peripheral member 35 facing the stack body 33. The said film | membrane 36 can suppress absorption of the radiant heat from the stack main body 33, and can be comprised with a white coating material or a silver coating material. The film 36 can suppress the outer peripheral member 35 from receiving radiant heat from the stack body 33.

  In the stack 30 </ b> C configured as described above, the heat transmitted from the heat absorber 22 to the stack main body 33 is transmitted from the stack main body 33 to the outer peripheral member 35 when the film 36 is not provided (the first The embodiment can be further suppressed as compared with the embodiment of

[Third Embodiment]
A stack according to the third embodiment and its peripheral structure will be described with reference to FIGS. FIG. 6 is a longitudinal sectional view showing the stack of this embodiment and its peripheral structure. FIG. 7 is a cross-sectional view of the stack of this embodiment, and is a cross-sectional view taken along the line VIII-VIII in FIG. In addition, about the structure substantially common to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, the stack 30 </ b> D of the present embodiment has a tubular outer peripheral member 35 </ b> D that surrounds the outside of the stack body 33. The outer peripheral member 35 </ b> D is provided coaxially with the stack body 33. The outer circumferential member 35 </ b> D is configured such that the innermost surface (hereinafter referred to as the innermost surface) 35 h is in contact with the stack body 33.

  The outer peripheral member 35D and the stack body 33 are sandwiched between the heat absorber 22D and the heat radiator 24D. The heat absorber 22D has a substantially disk shape, and the recess 22a (see FIG. 3) as in the first embodiment is not formed. Similarly, the radiator 24D has a substantially disk shape, and the recess 24a as in the first embodiment is not formed.

  The stack body 33 is supported by the innermost surface 35h of the outer peripheral member 35D. Of the outer peripheral member 35D, the first end surface 35a is coupled to the heat absorber 22D, and the second end surface 35c is coupled to the radiator 24D.

  As shown in FIG. 7, the outer circumferential member 35 </ b> D is formed with a plurality of grooves (groove bottoms are denoted by reference numeral 51 in the drawing) that are recessed radially outward from the innermost surface 35 h that contacts the stack body 33. A plurality of the grooves are arranged at predetermined intervals in the circumferential direction of the outer circumferential member 35D. Further, these grooves extend in the axial direction as shown in FIG. 6 (the side walls of the grooves are indicated by reference numeral 52 in FIG. 7).

  In the present embodiment, as shown in FIG. 7, the heat insulation space 37 </ b> D is a wall that defines the groove, that is, a space inside the groove bottom 51 and the side wall 52 of the groove. The heat insulating space 37D is arranged at a predetermined interval in the circumferential direction of the outer peripheral member 35D. By forming the heat insulation space 37D between the stack body 33 and the groove bottom 51, it is possible to suppress the heat of the stack body 33 from being transmitted to the outer peripheral member 35D, and the innermost surface 35h of the outer peripheral member 35D serves as the stack main body. 33 can be supported.

[Fourth Embodiment]
The stack of the fourth embodiment and its peripheral structure will be described with reference to FIGS. FIG. 8 is a longitudinal sectional view showing the stack of this embodiment and its peripheral structure. FIG. 9 is a cross-sectional view of the stack of the present embodiment, and is a cross-sectional view taken along line XX of FIG. In addition, about the structure substantially common with 1st and 3rd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 9, in the stack 30E of the present embodiment, the outer peripheral member 35 has an inner surface 35g having a circular cross section. Between the inner surface 35 g of the outer peripheral member 35 and the stack body 33, a plurality of substantially columnar members (hereinafter referred to as columnar members) 60 are arranged. As shown in FIG. 8, the columnar member 60 extends between the heat absorber 22D and the heat radiator 24D in the axial direction (indicated by an arrow A in the drawing). The cylindrical member 60 can be made of ceramics or metal.

  As shown in FIG. 9, the columnar members 60 are arranged at a predetermined interval in the circumferential direction of the outer peripheral member 35. The stack body 33 is supported by the outer peripheral member 35 via a plurality of columnar members 60. As shown in FIG. 8, among the outer peripheral members 35, the first end surface 35a is coupled to the heat absorber 22D, and the second end surface 35c is coupled to the radiator 24D.

  As shown in FIG. 9, the heat insulation space 37 </ b> E of the present embodiment is formed between the columnar members 60 adjacent to each other in the circumferential direction between the outer circumferential member 35 and the stack body 33. A plurality of heat insulating spaces 37 </ b> E are arranged in the circumferential direction between the outer peripheral member 35 and the stack body 33. By arranging a plurality of heat insulating spaces 37 </ b> E between the stack body 33 and the outer peripheral member 35, it is possible to suppress the heat of the stack body 33 from being transmitted to the outer peripheral member 35, and the outer peripheral member via the columnar member 60. 35 can support the stack body 33.

[Fifth Embodiment]
The stack of the fifth embodiment and its peripheral structure will be described with reference to FIGS. FIG. 10 is a longitudinal sectional view showing the stack of this embodiment and its peripheral structure. FIG. 11 is a cross-sectional view of the stack of the present embodiment, and is a cross-sectional view taken along line XII-XII in FIG. In addition, about the structure substantially common with 1st and 4th embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 11, also in the stack 30F of the present embodiment, the outer peripheral member 35 has an inner surface 35g having a circular cross section. A plurality of substantially spherical members (hereinafter referred to as spherical members) 70 are filled between the inner surface 35 g of the outer peripheral member 35 and the stack body 33. As shown in FIG. 10, the plurality of spherical members 70 are filled so as to be in contact with each other between the heat absorber 22D and the heat radiator 24D. The spherical member 70 can be made of ceramics or metal.

  The stack body 33 is supported by the outer peripheral member 35 via a plurality of spherical members 70. As shown in FIG. 11, among the outer peripheral members 35, the first end surface 35a is coupled to the heat absorber 22D, and the second end surface 35c is coupled to the radiator 24D.

  In the present embodiment, the heat insulation space 37 </ b> F is formed between the adjacent spherical members 70 between the outer peripheral member 35 and the stack body 33. As shown in FIG. 11, a large number of heat insulating spaces 37 </ b> F are provided in the circumferential direction between the outer peripheral member 35 and the stack body 33. Thereby, the heat of the stack body 33 can be suppressed from being transmitted to the outer peripheral member 35, and the outer peripheral member 35 can support the stack main body 33 via the spherical member 70.

Other Embodiment
In each embodiment mentioned above, although the stack shall constitute the sound pressure generation part 20 of a thermoacoustic apparatus, the stack which concerns on this invention is not limited to this aspect. The present invention can also be applied to the stack 82 of the cold heat generating unit 80 of the thermoacoustic device. In this case, in the stack 82, a temperature gradient is formed between the cooler 86 and the radiator 84. The cooler 86 transmits cold heat to the stack 82 as a first heat exchanger, and the radiator 84 receives cold heat from the stack 82 as a second heat exchanger. Note that it is also preferable to use a combination of the characteristic configurations of the above-described embodiments.

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

10, 10B Thermoacoustic device 12 End pipe 14 Central pipe 16 Pipe 15 Radiator side pipe 17 Heat absorber side pipe 20 Sound pressure generator 22, 22D Heat absorber (first heat exchanger)
22a dent 23 slit 24, 24D radiator (second heat exchanger)
24a Recess 25 Slit 30, 30C, 30D, 30E, 30F Stack 33 Stack body 33a, 33c Wall body 34 Passage passage 35, 35D Outer peripheral member 35a First end surface 35c Second end surface 35e Outer surface 35g Inner surface 35h Innermost surface 36 Film 37 , 37D, 37E, 37F Thermal insulation space 37a Air layer 37c Vacuum layer 42 First end 44 Second end 51 Groove bottom 52 Groove side wall 60 Columnar member 70 Spherical member 80 Cold heat generating portion 82 Stack 84 Radiator (Second heat exchanger)
86 Chiller (first heat exchanger)

Claims (10)

A stack provided between the first heat exchanger and the second heat exchanger to form a temperature gradient,
A stack body in which a plurality of through passages through which a working fluid can flow are arranged in parallel;
An outer peripheral member which is a metallic tubular member surrounding the outside of the stack body;
With
A stack for a thermoacoustic device, wherein a space for heat insulation is formed between the stack main body and the outer peripheral member so as to prevent heat of the stack main body from being transmitted to the outer peripheral member. . The stack of thermoacoustic devices according to claim 1, wherein the space for heat insulation is filled with air. The stack of thermoacoustic devices according to claim 1, wherein the space for heat insulation is configured to be a vacuum. The film | membrane which can suppress absorption of radiant heat from the said stack main body is formed in the inner surface facing the said stack main body among the said outer periphery members, The Claim 1 thru | or 3 characterized by the above-mentioned. A stack of thermoacoustic devices as described. The outer circumferential member is formed with a plurality of grooves that are recessed radially outward from the innermost surface in contact with the stack body and extending in the axial direction.
The stack of thermoacoustic devices according to any one of claims 1 to 4, wherein the space for heat insulation is a space inside a wall body that defines the groove. The stack of thermoacoustic devices according to claim 5, wherein the heat insulation spaces are arranged at a predetermined interval in a circumferential direction of the outer peripheral member. Between the outer peripheral member and the stack body, a substantially cylindrical shape is formed, and a plurality of cylindrical members extending in the axial direction are disposed,
5. The heat insulation space is formed between cylindrical members adjacent to each other in the circumferential direction between the outer peripheral member and the stack body. A stack of thermoacoustic devices according to claim 1. The columnar members are arranged at a predetermined interval in the circumferential direction of the outer peripheral member,
The stack of thermoacoustic devices according to claim 7, wherein the stack body is supported by the outer peripheral member via a plurality of the cylindrical members. The space for heat insulation is filled with a plurality of spherical members having a substantially spherical shape between the outer peripheral member and the stack body,
The stack of the thermoacoustic device according to any one of claims 1 to 4, wherein the stack body is supported by the outer peripheral member via the plurality of spherical members. A stack in which a temperature gradient is formed;
A first heat exchanger that transfers heat or cold to the stack;
A second heat exchanger that receives heat or cold transferred from the first heat exchanger to the stack;
With
The stack is
A stack body in which a plurality of through passages through which a working fluid can flow are arranged in parallel;
An outer peripheral member which is a metallic tubular member surrounding the outside of the stack body;
Have
A thermoacoustic device characterized in that a space for heat insulation is formed between the stack body and the outer peripheral member so as to prevent heat of the stack body from being transmitted to the outer peripheral member.

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