WO2019102564A1

WO2019102564A1 - Thermoacoustic engine

Info

Publication number: WO2019102564A1
Application number: PCT/JP2017/042118
Authority: WO
Inventors: 深谷　典之; 伊藤　剛; 竜樹加瀬
Original assignee: 中央精機株式会社
Priority date: 2017-11-23
Filing date: 2017-11-23
Publication date: 2019-05-31
Also published as: JP6884491B2; JPWO2019102564A1

Abstract

A thermoacoustic engine 110, which is incorporated in a thermoacoustic pipe 102 in which a working gas is sealed, comprises: a heat storage device 111 having a plurality of flow paths 111c penetrating in the longitudinal direction; a high-temperature-side heat exchanger 112 coupled to one end of the heat storage device; and a low-temperature-side heat exchanger 113 coupled to the other end of the heat storage device. The high-temperature-side heat exchanger comprises: a first section 112a connected to the one end of the heat storage device and in which a first opening 112a1 through which the working gas passes is formed; a second section 112b, which is interposed in a fluid passage 120 positioned on the outside of the thermoacoustic pipe and through which a fluid having a higher temperature than room temperature passes, and in which a second opening 112b1 through which the fluid passes is formed; and a connecting section 112c integrally connecting the first and second sections. The first opening is partitioned by a partition part 112a2. Thus, it is possible to provide a thermoacoustic engine equipped with a high-temperature-side heat exchanger having a simple configuration and a low manufacturing cost.

Description

Thermoacoustic engine

The present invention relates to thermoacoustic engines.

Conventionally, a thermoacoustic engine is known that is incorporated into a thermoacoustic pipe in which a working gas is sealed (see, for example, Patent Document 1). The thermoacoustic engine comprises a heat accumulator, a high temperature side heat exchanger, and a low temperature side heat exchanger. The heat accumulator has a plurality of flow paths penetrating in the longitudinal direction of the thermoacoustic pipe. The high temperature side heat exchanger is connected to one end in the longitudinal direction of the heat accumulator, and heats one end of the heat accumulator (and the working gas located near one end of the heat accumulator). The low temperature side heat exchanger is connected to the other end of the heat accumulator in the longitudinal direction to cool the other end of the heat accumulator (and the working gas located near the other end of the heat accumulator).

According to the thermoacoustic engine, a temperature gradient is generated between both ends of the heat accumulator by the action of the high-temperature side / low-temperature side heat exchangers respectively connected to the both ends of the heat accumulator. The working gas is self-excited in the longitudinal direction of the heat accumulator due to the temperature gradient, whereby a vibration wave (sound wave) due to the longitudinal wave is generated. As a result, acoustic energy (vibration energy) is generated in the thermoacoustic pipe. Thus, the acoustic energy generated in the thermoacoustic piping can be typically used for power generation driving of a generator, refrigeration operation of a refrigerator, and the like.

WO 2013/084830 gazette

By the way, in view of the large amount of waste heat of high-temperature waste fluid discharged and discarded from vehicles, etc., the thermal energy of the high-temperature waste fluid can be recovered with high efficiency and used effectively Technology is desired. For this reason, it is conceivable to use a high temperature waste fluid as a heat source (a heating source having a temperature higher than normal temperature) used for the high temperature side heat exchanger of the thermoacoustic engine described above.

In this case, a portion of the thermoacoustic piping in which the high temperature side heat exchanger is incorporated, the branch pipe branched and extended from the high temperature waste fluid flow path (for example, the factory chimney and the exhaust pipe of the vehicle) It is conceivable to connect to and traverse the inside of the part. In this configuration, the working gas is heat-exchanged with the high-temperature waste fluid in the branch pipe through the pipe wall of the branch pipe inside the portion to locate the end of the heat accumulator near one end. The working gas (and one end of the regenerator) is heated.

However, in this configuration, dirt and dirt may be attached in the branch pipe due to the passage of the waste fluid, which may cause clogging or deterioration of the branch pipe. In addition, since it is necessary to cross (penetrate) the branch pipe at the portion where the high temperature side heat exchanger is incorporated in the thermoacoustic piping, the structure of the high temperature side heat exchanger itself becomes complicated, and the high temperature side heat exchanger The manufacturing cost of itself increases. Furthermore, in order to branch the branch pipe from the high temperature waste fluid flow path, it is necessary to greatly remodel the high temperature waste fluid flow path (for example, a factory chimney and a vehicle exhaust pipe).

The present invention has been made in view of the above-mentioned point, and an object thereof is to provide a thermoacoustic engine provided with a high temperature side heat exchanger having a simple structure and low manufacturing cost.

The thermoacoustic engine which concerns on this invention is equipped with the same thermal storage device as the above-mentioned, a high temperature side heat exchanger, and a low temperature side heat exchanger. A feature of the thermoacoustic engine according to the present invention is that the high temperature side heat exchanger is a through hole connected to the one end of the heat accumulator and in communication with the plurality of flow paths and through which the working gas passes. 1) A first portion in which an opening is formed, and a second opening which is a through-hole through which the fluid passes, which is interposed in a flow path which is located outside the thermoacoustic piping and through which a high temperature fluid passes. And a connecting portion integrally extending from the first portion to the outside of the thermoacoustic pipe and integrally connecting the first portion and the second portion. And a solid material having thermal conductivity, wherein the first opening is partitioned by a partition.

According to this, the first portion, the second portion, and the connection portion that constitute the high temperature side heat exchanger are integrally formed of a solid material having thermal conductivity. The heat of a fluid (typically, a waste fluid) having a temperature higher than normal temperature passing through a flow path located outside the thermoacoustic piping is subjected to heat conduction of a solid to form a second portion, a connection portion, and a first portion The working gas located near the first portion (that is, near one end of the heat accumulator) is sequentially transmitted to heat the working gas and one end of the heat accumulator.

In other words, as described above, without crossing (piercing) the branch pipe through which the high temperature fluid passes into the interior of the thermoacoustic pipe, it is possible to place the high temperature away from each other by utilizing only the heat conduction of the solid. Heat exchange can occur between the fluid and the working gas. Therefore, the high temperature side heat exchanger can be manufactured with a simple configuration and low manufacturing cost.

Furthermore, the first opening of the first portion communicating with the plurality of flow paths in the heat accumulator is partitioned by the partition. This increases the surface area of the first opening in contact with the working gas, as compared to the case where there is no such partition (that is, the case where the first opening is one large through hole). The heat transfer efficiency between the part and the working gas is increased.

In addition, in the absence of such a partition, the working gas self-excited along the longitudinal direction in the vicinity of one end of the heat accumulator is from one end of the heat accumulator to the outside of the heat accumulator (that is, the first opening The phenomenon of self-oscillation of the working gas is likely to occur due to the sudden entry into a large space immediately after moving to the On the other hand, by providing such a partition part, such a phenomenon becomes difficult to occur, and the conversion efficiency from thermal energy of the high-temperature fluid to acoustic energy becomes high.

In the thermoacoustic engine according to the present invention, the partition portion has a cantilever shape extending parallel to each other from the edge on the connection portion side in the first opening to the vicinity of the edge on the opposite side to the connection portion side. It is preferable to have the shape of

According to this, the base end of the partition portion is connected to the edge on the connection portion side of the first opening (that is, the edge on the side to which the heat of the high temperature fluid is conducted). Therefore, the heat of the high temperature fluid is efficiently conducted to the partition as compared with the aspect in which the base end of the partition is connected to the edge at a position different from the edge on the connection portion side in the first opening. be able to.

Furthermore, the front end (free end) of the partition portion is not connected to the edge of the first opening opposite to the connection portion side (that is, an air layer is interposed between the front end and the edge). Therefore, an aspect in which the front end of the partition part is also connected to the edge on the opposite side to the connection part side in the first opening (that is, an aspect in which the partition part has a double-supported beam shape extending parallel to each other) Compared to the above, the temperature of the partition portion is less likely to occur due to the influence of "the edge on the opposite side to the connection portion side in the first opening" which is relatively low temperature. As a result, the heat transfer efficiency between the hot fluid and the working gas is increased because the temperature of the partition can be maintained at a high temperature.

In the thermoacoustic engine according to the present invention, preferably, a slit, which is a through hole along the outer edge, is formed in the vicinity of the outer edge of the high temperature side heat exchanger.

According to this, the outer edge portion of the high temperature side heat exchanger and the central portion excluding the outer edge portion (that is, the portion serving as a main path for conducting heat of the high temperature fluid from the second portion to the first portion) There is an air layer in between. Therefore, the temperature of the central portion of the high temperature side heat exchanger is affected by the outer edge portion of the high temperature side heat exchanger which is relatively low temperature as compared with the case where such a slit is not provided at all. It becomes difficult for the phenomenon of decreasing to occur. As a result, the heat transfer efficiency between the high temperature fluid and the working gas is increased because the temperature of the central portion of the high temperature side heat exchanger can be maintained at a high temperature.

FIG. 1 is a view schematically showing a schematic configuration of a thermoacoustic power generation system including a thermoacoustic engine according to the present invention. FIG. 2 is a view schematically showing the configuration of the thermoacoustic engine shown in FIG. FIG. 3 is a view showing an example of an end face (a plurality of flow paths) of the heat accumulator shown in FIG. FIG. 4 is a plan view of the high temperature side heat exchanger shown in FIG. FIG. 5 is a plan view of a high temperature side heat exchanger according to a modification.

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

(Constitution)
As shown in FIG. 1, the thermoacoustic power generation system 100 includes a pipe configuration unit 101 made of metal piping. The pipe configuration part 101 includes an annular pipe 102 which is an annular (loop-like) pipe part, and a branch pipe 103 which is branched from the annular pipe 102 and whose inner space communicates with the inner space of the annular pipe 102. The annular pipe 102 corresponds to the “thermoacoustic pipe” in the present invention.

The branch pipe 103 is a pipe portion having a branch point branched from the annular pipe 102 as one end 103 a and extending in a long shape from the one end 103 a to the other end 103 b. The branch pipe 103 is sealed by the energy outlet 160 at the other end 103 b. A predetermined working gas (in this embodiment, helium) is sealed in both the annular pipe 102 and the branch pipe 103 under a predetermined pressure. As the working gas, instead of or in addition to helium, nitrogen, argon, air, a mixed gas of these, or the like may be employed.

The annular pipe 102 is provided with three thermoacoustic engines (also referred to as “motors”) 110 connected in series. The three thermoacoustic engines 110 constitute a so-called "multistage thermoacoustic engine". Each thermoacoustic engine 110 includes a heat storage device 111 incorporated in the pipe of the annular pipe 102, a high temperature side heat exchanger 112 connected to one end 111a which is a high temperature part of the heat storage device 111, and a normal temperature part of the heat storage device 111. And a low temperature side heat exchanger 113 connected to the other end 111b which is a low temperature part. Note that the number of installed thermoacoustic engines 110 is not limited to three, and other numbers may be selected as necessary.

As shown in FIG. 2 and FIG. 3, the heat storage unit 111 has a cylindrical shape in which the cross-sectional shape in the direction perpendicular to the pipe longitudinal direction (extension direction of the pipe, x-axis direction) of the annular pipe 102 is circular. It is a structure. Both end surfaces of the heat accumulator 111 in the pipe longitudinal direction are planes perpendicular to the pipe longitudinal direction (x-axis direction). The heat accumulator 111 has a plurality of penetrating flow paths 111c extending in parallel with each other along the longitudinal direction (x-axis direction) of the pipe between the one end 111a and the other end 111b. The working gas vibrates in the plurality of flow paths 111c.

In the example shown in FIG. 3, the plurality of flow paths 111 c are partitioned and formed in a matrix by a plurality of walls dividing the inside of the heat accumulator 111 in the vertical and horizontal directions. As long as a plurality of penetrating channels extending in the longitudinal direction of the pipe are formed inside the heat accumulator 111, the inside of the heat accumulator 111 may be partitioned in any manner including a honeycomb shape and the like.

As the heat accumulator 111, for example, a structure of typically ceramic, a structure in which a plurality of mesh thin plates made of stainless steel are laminated in parallel with a fine pitch, a non-woven material made of metal fibers, etc. can be used. . It should be noted that, instead of the heat storage unit 111 having a circular cross section, it is also possible to employ an oval, a polygon or the like on the cross section.

In the heat accumulator 111, when a predetermined temperature gradient is generated between the one end 111a and the other end 111b, the working gas in the annular pipe 102 becomes unstable and vibrates in the longitudinal direction of the pipe. As a result, an oscillating wave (also referred to as “sound wave”, “oscillating flow” or “work flow”) is formed by the longitudinal wave oscillating along the longitudinal direction of the pipe, and this oscillating wave is branched from the pipe of the annular pipe 102. It is transmitted to the inside of the

As shown in FIG. 2, the low temperature side heat exchanger 113 is configured to be supplied with a cooling fluid such as cold air, cold water or the like from the cooling source 130. Specifically, the low temperature side heat exchanger 113 includes a main body block 113a assembled to the other end 111b of the heat accumulator 111, and an introduction pipe 113b assembled to the main body block 113a. A cylindrical cooling internal space 113c is formed in the main body block 113a along the longitudinal direction of the pipe (x-axis direction).

The cooling internal space 113c is in communication with the plurality of flow paths 111c of the heat accumulator 111, so that the working gas vibrates in the cooling internal space 113c. The introduction pipe 113b is airtightly assembled to the main body block 113a so as to cross (penetrate) the cooling inner space 113c in the direction (z-axis direction) orthogonal to the longitudinal direction of the pipe.

The introduction pipe 113 b is connected to the cooling source 130. By flowing the cooling fluid supplied from the cooling source 130 into the introduction pipe 113b, heat exchange is performed between the cooling fluid in the introduction pipe 113b and the working gas in the cooling internal space 113c of the main body block 113a. It will be. As a result, the working gas around the other end 111 b of the heat accumulator 111 and the other end 111 b of the heat accumulator 111 are cooled. The cooling fluid in the introduction pipe 113b whose temperature has risen after the heat exchange is returned to the cooling source 130 to be cooled again.

As shown in FIG. 2, the high temperature side heat exchanger 112 includes the heat of the fluid having a temperature higher than the normal temperature flowing in the pipe 120, the working gas around the one end 111 a of the heat accumulator 111, and one end of the heat accumulator 111 It is configured to transmit to the parts and heat them. The fluid having a temperature higher than the normal temperature flowing in the conduit 120 is typically a high-temperature waste fluid discharged and discarded from facilities such as a factory and vehicles and the like. Therefore, the conduit 120 is a chimney of a factory. And exhaust pipes of vehicles.

The high temperature side heat exchanger 112 is a long plate-like solid member which connects a part of the pipeline 120 located apart from each other and one end 111a of the heat accumulator 111 (a part of the annular pipe 102). (See also FIG. 4 described later). The high temperature side heat exchanger 112 is configured to perform heat exchange between the high temperature fluid and the working gas located apart from each other by utilizing only the heat conduction of the solid. The detailed configuration of the high temperature side heat exchanger 112 will be described later.

The cooperation between the heating action by the high temperature side heat exchanger 112 and the cooling action by the low temperature side heat exchanger 113 creates a predetermined temperature gradient between the one end 111 a and the other end 111 b in the heat accumulator 111. That is, the high temperature side heat exchanger 112 and the low temperature side heat exchanger 113 have temperature gradients between both ends of the plurality of flow channels 111 c of the heat accumulator 111 in order to cause the working gas enclosed in the piping configuration unit 101 to vibrate by itself. The heat exchanger is configured to exchange heat with the working gas so that

Referring back to FIG. 1, the branch piping 103 linearly extends on the opposite side of the annular piping 102 with the first piping portion 104 extending linearly between the annular piping 102 and the turbine 140 and the turbine 140 interposed therebetween. The existing second piping unit 105 and a crank piping unit 106 bent in a crank shape so as to connect the first piping unit 104 and the second piping unit 105 are provided.

The turbine 140 is configured to be in communication with the pipe of the branch pipe 103, and converts acoustic energy (also referred to as “vibration energy”) by vibration waves of the working gas present in the pipe of the branch pipe 103 into mechanical rotational energy. Perform a function. That is, the turbine 140 is provided in the branch pipe 103 and rotates by receiving acoustic energy generated by self-oscillation of the working gas in the thermoacoustic engine 110. Connected to the turbine 140 is a generator 150 for converting kinetic energy (rotational energy) by the rotation of the turbine 140 into electric power.

At the other end 103 b of the branch pipe 103, that is, at the pipe end opposite to the turbine 140 among the pipe ends on both sides of the second pipe 105, acoustic energy of the working gas is extracted from the branch pipe 103 to the outside of the pipe The energy extraction unit 160 is provided. The energy extracting unit 160 is typically configured by a known linear generator, a speaker generator, or the like capable of outputting electric energy (electric power) under pressure vibration.

(Operation)
Hereinafter, the operation of the thermoacoustic power generation system 100 configured as described above will be briefly described in line with the above description. As shown in FIG. 1, in each thermoacoustic engine 110, one end 111 a of the heat accumulator 111 is heated by the high temperature heat exchanger 112, and the other end 111 b of the heat accumulator 111 is cooled by the low temperature heat exchanger 113. Then, a temperature gradient is generated between the one end 111 a and the other end 111 b of the heat accumulator 111. Due to this temperature gradient, in each heat accumulator 111, an oscillating wave is formed mainly by the self-excited oscillation of the working gas. The acoustic energy (vibration energy) by the vibration wave (sound wave) is transmitted from the annular pipe 102 of the pipe configuration section 101 to the turbine 140 through the branch pipe 103 and further transmitted to the energy extracting section 160. In this case, the branch pipe 103 is configured as a resonant pipe (waveguide) for guiding the acoustic energy of the working gas generated in the thermoacoustic engine 110. A portion of the acoustic energy is extracted by a turbine 140 which is an energy extracting means, converted into electric energy (electric power) by a generator 150 connected to the turbine 140, and extracted by an energy extracting unit 160 to a predetermined energy (power). For example, it is converted into vibration energy, electrical energy, etc.).

(Configuration of high-temperature side heat exchanger, and action and effect)
As described above, the high temperature side heat exchanger 112 uses facilities such as a factory and high temperature waste fluid discharged and discarded from a vehicle or the like as a heat source (a heating source having a temperature higher than normal temperature). In this case, as the high temperature side heat exchanger 112, similar to the low temperature side heat exchanger 113, the high temperature waste fluid may be supplied from the pipe line 120. That is, as the high temperature side heat exchanger 112, the branch pipe branched and extended from the pipe line 120 is connected to the main body block assembled to the one end 111a of the heat accumulator 111, and traversed in the internal space of the main body block. The configuration is conceivable.

However, in this configuration, dirt and dirt may be attached in the branch pipe due to the passage of the waste fluid, which may cause clogging or deterioration of the branch pipe. In addition, since the branch pipe needs to be airtightly crossed (penetrated) by the main body block assembled to one end 111a of the heat accumulator 111, the structure of the high temperature side heat exchanger itself becomes complicated, and the high temperature side heat exchange The cost of manufacturing the vessel itself is high. Furthermore, in order to branch the branch pipe from the pipe line 120, the pipe line 120 needs to be largely remodeled.

Therefore, in the present embodiment, as shown in FIG. 2 and FIG. 4, the high temperature side heat exchanger 112 is a long plate 1 made of a solid material (typically, a metal material) having good thermal conductivity. It consists only of two solid members. Specifically, the high temperature side heat exchanger 112 includes a first portion 112a connected to one end 111a of the heat accumulator 111, a second portion 112b interposed and fixed in the pipe line 120, and a first portion 112a. And a connecting portion 112c integrally extending out of the annular pipe 102 and integrally connecting the first portion 112a and the second portion 112b. In the present example, the connecting portion 112c linearly extends between the first and

second portions

112a and 112b along the direction (z-axis direction) connecting the one end portion 111a of the heat accumulator 111 and the pipe line 120. ing. Of course, the connecting portion 112c may extend while bending between the first and

second portions

112a and 112b.

In the first portion 112a, a first opening 112a1 is formed which is a through hole penetrating in the thickness direction (x-axis direction, piping longitudinal direction). The outline shape of the first opening 112a1 is a circular shape having a diameter substantially the same as the inner diameter of the cylindrical heat accumulator 111 (see FIG. 3). The first opening 112a1 is in communication with the plurality of flow paths 111c (see FIG. 3) of the heat accumulator 111, and the working gas can pass through the first opening 112a1.

The first opening 112a1 is composed of a plurality of openings partitioned by a plurality of partition portions 112a2. Each of the plurality of partition portions 112a2 extends from the edge of the first opening 112a1 on the connection portion 112c side (z-axis positive direction side) to the vicinity of the edge on the opposite side (z-axis negative direction side) of the connection portion 112c It has a cantilever shape extending parallel to each other along the extending direction (z-axis direction) of the connecting portion 112c.

The second portion 112 b is formed with a second opening 112 b 1 which is a through hole penetrating in the thickness direction (x-axis direction, extending direction of the conduit 120). The outline shape of the second opening 112b1 is a circle having a diameter substantially the same size as the inner diameter of the tubular conduit 120 (see FIG. 2). The second opening 112 b 1 is in communication with the internal space of the conduit 120, and high temperature waste fluid can pass through the second opening 112 b 1.

The second opening 112 b 1 is configured of a plurality of openings partitioned by a plurality of partition portions 112 b 2. Each of the plurality of partition portions 112b2 extends from the edge of the second opening 112b1 on the connection portion 112c side (z-axis negative direction side) to the vicinity of the edge on the opposite side (z-axis positive direction side) of the connection portion 112c It has a cantilever shape extending parallel to each other along the extending direction (z-axis direction) of the connecting portion 112c.

In this example, the first portion 112a is larger than the second portion 112b due to the first opening 112a1 being larger than the second opening 112b1. Therefore, the connecting portion 112c has a shape in which the width dimension (dimension in the y-axis direction) gradually increases from the second portion 112b toward the first portion 112a. Of course, the first portion 112a may be smaller than the second portion 112b, or the sizes of the first and

second portions

112a and 112b may be the same.

According to the high temperature side heat exchanger 112 having the above configuration, the heat of the fluid (typically, the waste fluid) having a temperature higher than the normal temperature passing through the pipe line 120 located outside the annular pipe 102 is solid By heat conduction, it is transmitted to the working gas located in the vicinity of the first portion 112a (that is, in the vicinity of one end 111a of the heat accumulator 111) sequentially through the second portion 112b, the connection portion 112c, and the first portion 112a. The working gas and one end 111 a of the heat accumulator 111 are heated.

In other words, without crossing (penetrating) the branch pipe through which the high temperature fluid passes into the inside of the annular pipe 102, only the heat conduction of the solid is used to separate the high temperature fluid and the working gas located apart from each other. Heat exchange can be performed between them. For this reason, the high temperature side heat exchanger 112 can be manufactured with a simple configuration and low manufacturing cost.

Further, the first opening 112a1 of the first portion 112a in communication with the plurality of flow paths 111c in the heat accumulator 111 is constituted by a plurality of openings partitioned by a plurality of cantilevered partition portions 112a2. Thereby, the surface area of the first opening 112a1 in contact with the working gas is larger than that in the case where there are no such partition portions 112a2 (that is, the first opening 112a1 is one large through hole). Thus, the heat transfer efficiency between the first portion 112a and the working gas is enhanced.

Further, in the case where there are no such partition portions 112 a 2, the working gas self-excited vibrating in the longitudinal direction (x-axis direction) of the pipe in the vicinity of one end 111 a of the heat accumulator 111 is one end of the heat accumulator 111 Due to the sudden approach to the wide space immediately after moving from 111a to the outside of the heat accumulator 111 (that is, the first opening 112a1), a phenomenon in which the self-excited vibration of the working gas attenuates tends to occur. On the other hand, by providing such a plurality of partition parts 112a2, such a phenomenon becomes difficult to occur, and the conversion efficiency from thermal energy of the high-temperature fluid to acoustic energy becomes high.

Further, the base end of each of the plurality of cantilevered partition portions 112a2 conducts the heat of the high temperature fluid (that is, the edge of the first opening 112a1 on the side of the connecting portion 112c (the z-axis positive direction side) It is connected with the edge of the coming side). Therefore, compared to the aspect in which the base end of each of the plurality of partition portions 112a2 is connected to the edge at a position different from the edge on the connection portion 112c side in the first opening 112a1, Can be efficiently conducted to the partition portion 112a2 of the

In addition, the tip (free end) of each of the plurality of cantilevered partitions 112a2 is not connected to the edge of the first opening 112a1 on the opposite side (z-axis negative direction side) to the connecting portion 112c side (ie , An air layer is interposed between the tip and the edge). Therefore, an aspect in which the tip of each of the plurality of partition portions 112a2 is also connected to the edge of the first opening 112a1 opposite to the connection portion 112c side (that is, each of the plurality of partition portions 112a2 extends in parallel with each other) "The edge of the first opening 112a1 on the opposite side to the connecting portion 112c side" in which the temperatures of the plurality of partitions 112a2 are relatively low compared to the embodiment having a beam shape) It becomes difficult to generate the phenomenon of lowering due to the influence of As a result, since the temperatures of the plurality of partition portions 112a2 can be maintained at a high temperature, the heat transfer efficiency between the high temperature fluid and the working gas is enhanced.

Further, the second opening 112b1 of the second portion 112b communicating with the internal space of the conduit 120 is constituted by a plurality of openings partitioned by a plurality of cantilevered partition portions 112b2. Thereby, the surface area of the second opening 112b1 in contact with the high temperature fluid is smaller than in the case where there are no such partition portions 112b2 (that is, the second opening 112b1 is one large through hole). As it becomes larger, the heat transfer efficiency between the second portion 112 b and the high temperature fluid becomes higher.

Further, the base end of each of the plurality of cantilevered partition portions 112b2 conducts the heat of the high temperature fluid (that is, the edge of the second opening portion 112b1 on the side of the connecting portion 112c (the z-axis negative direction side) Connected to the edge of the Therefore, compared with the aspect in which the base end of each of the plurality of partition parts 112b2 is connected to the edge at a position different from the edge on the connection part 112c side in the second opening 112b1, the heat of the high temperature fluid is connected It can conduct efficiently to portion 112c.

In addition, the tip (free end) of each of the plurality of cantilevered partitions 112b2 is not connected to the edge of the second opening 112b1 on the opposite side (z-axis positive direction side) to the connecting portion 112c side (that is, , An air layer is interposed between the tip and the edge). Therefore, an aspect in which the tip of each of the plurality of partition portions 112b2 is also connected to the edge of the second opening 112b1 opposite to the connection portion 112c side (that is, both ends of the plurality of partition portions 112b2 extend in parallel with each other) "The edge of the second opening 112b1 on the opposite side to the connecting portion 112c side" in which the temperatures of the plurality of partitions 112b2 are relatively lower than in the embodiment having a beam-like shape) It becomes difficult to generate the phenomenon of lowering due to the influence of As a result, since the temperatures of the plurality of partition portions 112b2 can be maintained at a high temperature, the heat transfer efficiency between the high temperature fluid and the working gas is enhanced.

The invention is not limited to the exemplary embodiments described above, but various applications and modifications are conceivable without departing from the object of the invention. For example, the following embodiments to which the above embodiment is applied can be implemented.

In the above embodiment, the first opening 112a1 of the first portion 112a is partitioned by the plurality of cantilevered partitions 112a2. However, the first opening 112a1 may be partitioned by the plurality of cantilevered partitions. . Further, although the base ends of the plurality of cantilevered partitions 112a2 are connected to the edge of the first opening 112a1 on the side of the connecting portion 112c (the z-axis positive direction side), the connection at the first opening 112a1 is It may be connected to the edge at a position different from the portion 112 c side.

In the above embodiment, the second opening 112b1 of the second portion 112b is partitioned by the plurality of cantilevered partitions 112b2. However, the second opening 112b1 is partitioned by the plurality of cantilevered partitions. It is also good. The base ends of the plurality of cantilevered partitions 112b2 are connected to the edge of the second opening 112b1 on the side of the connecting portion 112c (the z-axis negative direction side), but the connection at the second opening 112b1 is It may be connected to the edge at a position different from the portion 112 c side. Furthermore, the plurality of partition portions 112b2 may not be provided (that is, the second opening 112b1 may be one large through hole).

Moreover, in the said embodiment, although the high temperature side heat exchanger 112 is comprised by one solid member of elongate plate shape, you may be comprised laminating | stacking the thin plate member of planar view same shape. When the high temperature side heat exchanger 112 is formed of one solid member having a relatively large thickness, in order to form a plurality of cantilevered partition portions 112a2 and 112b2 having a very complicated shape. The high temperature side heat exchanger 112 needs to be manufactured using wire cut electrical discharge machining or the like. On the other hand, when the high temperature side heat exchanger 112 is configured by laminating thin plate members, each thin plate member can be manufactured by press processing etc., so the manufacturing cost of the high temperature side heat exchanger 112 is reduced. It is possible.

Further, in the above embodiment, as shown in FIG. 5, a slit 112 d may be formed in the vicinity of the outer edge of the high temperature side heat exchanger 112, which is a through hole along the outer edge. In the example shown in FIG. 5, the outer edge of the high temperature side heat exchanger 112 is located at four places (the edge opposite to the connecting portion 112c side in the first portion 112a, the edge opposite to the connecting portion 112c in the second portion 112b Slits 112d are formed on the both sides of the connecting portion 112c in the width direction), but the slits 112d may be formed at one, two or three of them. .

Thus, by providing the slit 112d, the heat is transferred from the second portion 112b to the first portion 112a at the outer edge portion of the high temperature side heat exchanger 112 and at the central portion excluding the outer edge portion. An air layer intervenes between the main route and the main route). Therefore, the high temperature side heat exchanger in which the temperature of the central portion of the high temperature side heat exchanger 112 is relatively low compared to the case where such slits 112d are not provided at all (see FIG. 4). Under the influence of the outer edge portion 112, the phenomenon of decreasing is less likely to occur. As a result, since the temperature of the central portion of the high temperature side heat exchanger 112 can be maintained at a high temperature, the heat transfer efficiency between the high temperature fluid and the working gas is high.

DESCRIPTION OF SYMBOLS 110 ... Thermoacoustic engine 102 ... Annular piping (piping for thermoacoustics) 111 ... Thermal storage device 111 ... One end part, 111b ... Other end part 111c ... Several flow paths 112 ... High temperature side heat exchanger, 112a ... 1st part, 112a1 ... 1st opening, 112a 2 ... partition, 112b ... 2nd part, 112b 1 ... 2nd opening, 112b 2 ... partition, 112c ... connected part, 112d ... slit, 113 ... low temperature side heat exchanger

Claims

A thermoacoustic engine incorporated in thermoacoustic piping in which a working gas is sealed, comprising:
A heat accumulator having a plurality of flow paths penetrating in the longitudinal direction of the thermoacoustic pipe;
A high temperature side heat exchanger connected to one end of the heat accumulator in the longitudinal direction to heat the one end of the heat accumulator;
A low temperature side heat exchanger connected to the other end of the heat accumulator in the longitudinal direction to cool the other end of the heat accumulator;
Equipped with
The high temperature side heat exchanger
A first portion connected to the one end of the heat accumulator and in communication with the plurality of flow paths and formed with a first opening which is a through hole through which the working gas passes;
A second portion having a second opening which is a through hole which is located outside the thermoacoustic pipe and through which a fluid having a temperature higher than normal temperature passes and which passes the fluid;
A connecting portion integrally extending from the first portion to the outside of the thermoacoustic pipe and integrally connecting the first portion and the second portion;
And is made of a solid material having thermal conductivity,
The thermoacoustic engine, wherein the first opening is partitioned by a partition.
In the thermoacoustic engine according to claim 1,
The thermo-acoustic transducer has a cantilever shape extending parallel to each other from the edge on the connection portion side of the first opening to the vicinity of the edge on the opposite side to the connection portion. engine.
The thermoacoustic engine according to claim 1 or 2,
The thermoacoustic engine in which the slit which is a through-hole along the said outer edge is formed in the vicinity of the outer edge of the said high temperature side heat exchanger.