JP6884491B2 - Thermoacoustic engine - Google Patents

Description

The present invention relates to a thermoacoustic engine.

Conventionally, a thermoacoustic engine incorporated in a thermoacoustic pipe filled with a working gas has been known (see, for example, Patent Document 1). The thermoacoustic engine includes a heat storage device, a high temperature side heat exchanger, and a low temperature side heat exchanger. The heat storage device has a plurality of flow paths penetrating in the longitudinal direction of the thermoacoustic piping. The high temperature side heat exchanger is connected to one end of the heat storage in the longitudinal direction to heat one end of the heat storage (and the working gas located near one end of the heat storage). The low temperature side heat exchanger is connected to the other end of the heat storage in the longitudinal direction to cool the other end of the heat storage (and the working gas located near the other end of the heat storage).

According to the thermoacoustic engine, a temperature gradient is generated between both ends of the heat storage device due to the action of the high temperature side and low temperature side heat exchangers connected to both ends of the heat storage device. Due to this temperature gradient, the working gas self-excited and vibrates along the longitudinal direction of the heat storage device, so that a vibration wave (sound wave) due to a longitudinal wave is generated. As a result, acoustic energy (vibration energy) is generated in the thermoacoustic piping. The acoustic energy generated in the thermoacoustic piping can be typically used for power generation drive of a generator, refrigeration operation of a refrigerator, and the like.

WO2013 / 084830

By the way, in view of the fact that the amount of exhaust heat of the high-temperature waste fluid discharged / discarded from equipment such as factories and vehicles is still large, the thermal energy of the high-temperature waste fluid is recovered with high efficiency and effectively utilized. Technology is desired. Therefore, it is conceivable to use a high-temperature waste fluid as a heat source (heat source having a temperature higher than normal temperature) used in the high-temperature side heat exchanger of the thermoacoustic engine described above.

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

However, in this configuration, soot and dirt due to the passage of the waste fluid may adhere in the branch pipe, and the branch pipe may be clogged or deteriorated. In addition, since it is necessary to cross (penetrate) the branch pipe at the portion of the thermoacoustic piping in which the high temperature side heat exchanger is incorporated, the structure of the high temperature side heat exchanger itself becomes complicated, and the high temperature side heat exchanger itself. The manufacturing cost of itself becomes high. Furthermore, in order to branch the branch pipe from the flow path of the high temperature waste fluid, it is necessary to significantly modify the flow path of the high temperature waste fluid (for example, the chimney of the factory and the exhaust pipe of the vehicle).

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

The thermoacoustic engine according to the present invention includes the same heat storage device, high temperature side heat exchanger, and low temperature side heat exchanger as described above. A feature of the thermoacoustic engine according to the present invention is a through hole in which the high temperature side heat exchanger is connected to the one end portion of the heat storage device, communicates with the plurality of flow paths, and allows the working gas to pass through. The first portion in which one opening is formed and the second opening, which is a through hole located outside the thermoacoustic pipe and inserted into a flow path through which a fluid having a temperature higher than normal temperature passes, and through which the fluid passes. A second portion in which a portion is formed and a connecting portion that integrally extends from the first portion to the outside of the thermoacoustic pipe and integrally connects the first portion and the second portion are provided. The first opening is partitioned by a partition, which is made of a solid material having thermal conductivity.

According to this, the first portion, the second portion, and the connecting portion constituting 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) that is hotter than room temperature and passes through a flow path located outside the thermoacoustic piping is transferred to the second part, the connecting part, and the first part due to the heat conduction of the solid. Is transmitted to the working gas located in the vicinity of the first portion (that is, in the vicinity of one end of the heat storage device), and the working gas and one end of the heat storage device are heated.

In other words, as described above, the high temperature temperature is located apart from each other by utilizing only the heat conduction of the solid without crossing (penetrating) the branch pipe through which the high temperature fluid passes inside the thermoacoustic pipe. Heat exchange can be performed between the fluid and the working gas. Therefore, the high temperature side heat exchanger can be manufactured with a simple structure and at a low manufacturing cost.

Further, the first opening of the first portion communicating with the plurality of flow paths in the heat storage device is partitioned by the partition portion. As a result, the surface area of the first opening in contact with the working gas is larger than that in the case where there is no such partition (that is, when 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 and oscillated along the longitudinal direction near one end of the regenerator extends from one end of the regenerator to the outside of the regenerator (ie, the first opening). Due to the sudden entry into a wide space immediately after moving to the part), the phenomenon that the self-excited vibration of the working gas is attenuated tends to occur. On the other hand, by providing such a partition portion, such a phenomenon is less likely to occur, and the conversion efficiency from the thermal energy of the high-temperature fluid to the acoustic energy is increased.

In the thermoacoustic engine according to the present invention, the partition portion has a cantilever shape extending in parallel with each other from the edge portion on the connecting portion side of the first opening to the vicinity of the edge portion on the opposite side to the connecting 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 portion on the connecting portion side of the first opening (that is, the edge portion on the side where the heat of the high-temperature fluid is conducted). Therefore, the heat of the high-temperature fluid is efficiently conducted to the partition portion as compared with the embodiment in which the base end of the partition portion is connected to the edge portion at a position different from the edge portion on the connecting portion side in the first opening. be able to.

Furthermore, the tip (free end) of the partition is not connected to the edge of the first opening opposite to the connecting portion side (that is, an air layer is interposed between the tip and the edge). Therefore, a mode in which the tip of the partition portion is also connected to the edge portion on the side opposite to the connecting portion side in the first opening (that is, the partition portion has a double-sided beam-like shape extending in parallel with each other). ), The temperature of the partition portion is less likely to decrease due to the influence of the "edge portion on the side opposite to the connecting portion side in the first opening" which is relatively low. As a result, the temperature of the partition portion can be maintained at a high temperature, so that the heat transfer efficiency between the hot fluid and the working gas is increased.

In the thermoacoustic engine according to the present invention, it is preferable that a slit, which is a through hole along the outer edge, is formed in a portion near 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 that becomes the main path through which the heat of the high temperature fluid is conducted from the second portion to the first portion). An air layer intervenes between them. Therefore, the temperature of the central portion of the high temperature side heat exchanger is affected by the outer edge of the high temperature side heat exchanger, which is relatively low, as compared with the case where such a slit is not provided at all. The phenomenon of decrease is less likely to occur. As a result, the temperature of the central portion of the high temperature side heat exchanger can be maintained at a high temperature, so that the heat transfer efficiency between the high temperature fluid and the working gas is increased.

FIG. 1 is a diagram schematically showing a schematic configuration of a thermoacoustic power generation system including a thermoacoustic engine according to the present invention. FIG. 2 is a diagram schematically showing the configuration of the thermoacoustic engine shown in FIG. FIG. 3 is a diagram showing an example of end faces (plurality of flow paths) of the heat storage device 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 the high temperature side heat exchanger according to the modified example.

Hereinafter, embodiments of the 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 component 101 made of a metal pipe. The pipe component 101 includes an annular pipe 102 which is an annular (loop-shaped) piping portion, and a branch pipe 103 which branches from the annular pipe 102 and whose in-pipe space communicates with the in-pipe space of the annular pipe 102. The annular pipe 102 corresponds to the "thermoacoustic pipe" of the present invention.

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

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

As shown in FIGS. 2 and 3, the heat storage device 111 is a columnar shape having a circular cross-sectional shape in the direction perpendicular to the pipe longitudinal direction (pipe extension direction, x-axis direction) of the annular pipe 102. It is a structure. Both end faces of the heat storage device 111 in the longitudinal direction of the pipe are planes perpendicular to the longitudinal direction of the pipe (x-axis direction). The heat storage device 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 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 111c are partitioned and formed in a matrix by a large number of walls that vertically and horizontally partition the inside of the heat storage device 111. As long as a plurality of penetrating flow paths extending in the longitudinal direction of the pipe are formed inside the heat storage device 111, the inside of the heat storage device 111 may be partitioned in any way including a honeycomb shape or the like.

As the heat storage device 111, for example, a structure made of ceramic, a structure in which a plurality of thin mesh plates made of stainless steel are laminated in parallel at a fine pitch, a non-woven fabric made of metal fibers, and the like can be used. .. As the heat storage device 111, one having an elliptical cross section, a polygonal cross section, or the like can be adopted instead of the one having a circular cross section.

In the heat storage device 111, when a predetermined temperature gradient is generated between one end 111a and the other end 111b, the working gas in the annular pipe 102 becomes unstable and self-excited and vibrates along the longitudinal direction of the pipe. As a result, a vibration wave (also referred to as "sound wave", "vibration flow" or "work flow") due to a longitudinal wave vibrating along the longitudinal direction of the pipe is formed, and this vibration wave is generated from the inside of the annular pipe 102 to the branch pipe 103. It is designed to be transmitted to the inside of the jurisdiction of.

As shown in FIG. 2, the low temperature side heat exchanger 113 is configured so that a cooling fluid such as cold air or cold water is supplied 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 storage device 111, and an introduction pipe 113b assembled to the main body block 113a. The main body block 113a is formed with a columnar cooling internal space 113c penetrating along the longitudinal direction (x-axis direction) of the pipe.

The cooling internal space 113c communicates with a plurality of flow paths 111c of the heat storage device 111, and 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 internal space 113c in a direction (z-axis direction) orthogonal to the longitudinal direction of the pipe.

The introduction pipe 113b is connected to the cooling source 130. By flowing the cooling fluid supplied from the cooling source 130 through 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 is said. As a result, the working gas around the other end 111b of the heat storage 111 and the other end 111b of the heat storage 111 are cooled. The cooling fluid in the introduction pipe 113b whose temperature has risen after heat exchange is returned to the cooling source 130 and cooled again.

As shown in FIG. 2, in the high temperature side heat exchanger 112, the heat contained in the fluid having a temperature higher than normal temperature flowing in the pipeline 120 is transferred to the working gas around one end 111a of the heat storage 111 and one end of the heat storage 111. It is configured to transmit to the parts and heat them. The fluid having a temperature higher than normal temperature flowing in the pipeline 120 is typically a waste fluid having a temperature higher than normal temperature discharged and discarded from equipment such as a factory and a vehicle or the like. Therefore, the pipeline 120 is a chimney of the factory. , And the exhaust pipe of the vehicle.

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

By the cooperation of the heating action by the high temperature side heat exchanger 112 and the cooling action by the low temperature side heat exchanger 113 described above, a predetermined temperature gradient is generated between the one end portion 111a and the other end portion 111b in the heat storage device 111. That is, the high temperature side heat exchanger 112 and the low temperature side heat exchanger 113 have a temperature gradient between both ends of the plurality of flow paths 111c of the heat storage device 111 in order to self-excited and vibrate the working gas sealed in the piping component 101. A heat exchanger is configured to exchange heat with the working gas so as to generate heat.

Returning to FIG. 1, the branch pipe 103 extends linearly to the side opposite to the annular pipe 102 with the turbine 140 sandwiched between the first pipe portion 104 extending linearly between the annular pipe 102 and the turbine 140. It includes an existing second piping section 105, and a crank piping section 106 bent in a crank shape so as to connect the first piping section 104 and the second piping section 105.

The turbine 140 is configured to communicate with the inside of the branch pipe 103, and converts the acoustic energy (also referred to as “vibration energy”) due to the vibration wave of the working gas existing in the pipe of the branch pipe 103 into mechanical rotational energy. Fulfill function. That is, the turbine 140 rotates by receiving the acoustic energy generated by the self-excited vibration of the working gas in the thermoacoustic engine 110 provided in the branch pipe 103. A generator 150 for converting kinetic energy (rotational energy) due to rotation of the turbine 140 into electric power is connected to the turbine 140.

In order to extract the acoustic energy of the working gas from the branch pipe 103 to the other end 103b of the branch pipe 103, that is, at the pipe ends on both sides of the second pipe 105 on the side opposite to the turbine 140. The energy extraction unit 160 of the above is provided. The energy extraction unit 160 is typically composed of a known linear generator, speaker type generator, or the like capable of receiving electric energy (electric power) by receiving pressure vibration.

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

(Structure of high temperature side heat exchanger, as well as action / effect)
As described above, the high-temperature side heat exchanger 112 uses high-temperature waste fluid discharged / discarded from equipment such as factories and vehicles as a heat source (heat source having a temperature higher than normal temperature). In this case, the high temperature side heat exchanger 112 may be configured to supply the high temperature waste fluid from the pipeline 120 as in the low temperature side heat exchanger 113. That is, as the high temperature side heat exchanger 112, the branch pipe branched / extended from the pipeline 120 is connected to the main body block assembled to one end 111a of the heat storage device 111 and crossed in the internal space of the main body block. The configuration is conceivable.

However, in this configuration, soot and dirt due to the passage of the waste fluid may adhere in the branch pipe, and the branch pipe may be clogged or deteriorated. Further, since it is necessary to airtightly cross (penetrate) the branch pipe with the main body block attached to one end 111a of the heat storage device 111, the structure of the high temperature side heat exchanger itself becomes complicated, and the high temperature side heat exchange The manufacturing cost of the vessel itself becomes high. Furthermore, in order to branch the branch pipe from the pipeline 120, it is necessary to significantly modify the pipeline 120.

Therefore, in the present embodiment, as shown in FIGS. 2 and 4, the high temperature side heat exchanger 112 is a long plate-shaped 1 made of a solid material (typically a metal material) having good thermal conductivity. It consists of only one solid member. Specifically, the high temperature side heat exchanger 112 includes a first portion 112a connected to one end portion 111a of the heat storage device 111, a second portion 112b inserted and fixed in the pipeline 120, and a first portion 112a. It is composed of a connecting portion 112c that integrally extends to the outside of the annular pipe 102 and integrally connects the first portion 112a and the second portion 112b. In this example, the connecting portion 112c extends linearly between the first and second portions 112a and 112b along the direction (z-axis direction) connecting one end portion 111a of the heat storage device 111 and the conduit 120. ing. Of course, the connecting portion 112c may extend while bending between the first and second portions 112a and 112b.

The first portion 112a is formed with a first opening 112a1 which is a through hole penetrating in the plate thickness direction (x-axis direction, pipe longitudinal direction). The contour shape of the first opening 112a1 is a circular shape having a diameter substantially the same as the inner diameter of the columnar heat storage device 111 (see FIG. 3). The first opening 112a1 communicates with a plurality of flow paths 111c (see FIG. 3) of the heat storage device 111, so that the working gas can pass through the first opening 112a1.

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

The second portion 112b is formed with a second opening 112b1 which is a through hole penetrating in the plate thickness direction (x-axis direction, extending direction of the pipeline 120). The contour shape of the second opening 112b1 is a circular shape having a diameter substantially the same as the inner diameter of the circular tubular pipe line 120 (see FIG. 2). The second opening 112b1 communicates with the internal space of the pipeline 120 so that high-temperature waste fluid can pass through the second opening 112b1.

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

In this example, the first portion 112a is larger than the second portion 112b because the first opening 112a1 is 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 first and second portions 112a and 112b may have the same size.

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

In other words, the hot fluid and the working gas, which are located apart from each other, utilize only the heat conduction of the solid without crossing (penetrating) the branch pipe through which the hot fluid passes inside the annular pipe 102. Heat exchange can be performed between them. Therefore, the high temperature side heat exchanger 112 can be manufactured with a simple structure and at a low manufacturing cost.

Further, the first opening 112a1 of the first portion 112a communicating with the plurality of flow paths 111c in the heat storage device 111 is composed of a plurality of openings partitioned by a plurality of cantilever-shaped partition portions 112a2. As a result, the surface area of the first opening 112a1 in contact with the working gas is larger than that in the case where there is no such a plurality of partition portions 112a2 (that is, when the first opening 112a1 is one large through hole). Therefore, the heat transfer efficiency between the first portion 112a and the working gas is increased.

Further, when there is no such a plurality of partition portions 112a2, the working gas self-excited and vibrated along the pipe longitudinal direction (x-axis direction) in the vicinity of one end portion 111a of the regenerator 111 is one end of the regenerator 111. The self-excited vibration of the working gas is likely to be attenuated due to the sudden entry into a wide space immediately after moving from the 111a to the outside of the heat storage device 111 (that is, the first opening 112a1). On the other hand, by providing such a plurality of partition portions 112a2, such a phenomenon is less likely to occur, and the conversion efficiency from the thermal energy of the high-temperature fluid to the acoustic energy is increased.

Further, the base end of each of the plurality of cantilever-shaped partition portions 112a2 conducts the heat of the high-temperature fluid at the edge portion of the first opening 112a1 on the connecting portion 112c side (z-axis positive direction side). It is connected to the edge on the coming side). Therefore, as compared with the embodiment in which the base end of each of the plurality of partition portions 112a2 is connected to the edge portion at a position different from the edge portion on the connecting portion 112c side in the first opening 112a1, a plurality of heats of the high temperature fluid are generated. It can be efficiently conducted to the partition portion 112a2 of the above.

Further, the tip (free end) of each of the plurality of cantilever-shaped partition portions 112a2 is not connected to the edge portion of the first opening 112a1 opposite to the connecting portion 112c side (z-axis negative direction side) (that is,). , An air layer intervenes between the tip and the edge). Therefore, the tip of each of the plurality of partition portions 112a2 is also connected to the edge portion of the first opening 112a1 on the side opposite to the connecting portion 112c side (that is, the plurality of partition portions 112a2 each extend in parallel with each other. The temperature of the plurality of partition portions 112a2 is relatively low as compared with the embodiment having a beam-like shape) "the edge portion of the first opening 112a1 opposite to the connecting portion 112c side". It becomes difficult for the phenomenon of decrease due to the influence of As a result, the temperature of the plurality of partition portions 112a2 can be maintained at a high temperature, so that the heat transfer efficiency between the high-temperature fluid and the working gas becomes high.

Further, the second opening 112b1 of the second portion 112b communicating with the internal space of the pipeline 120 is composed of a plurality of openings partitioned by a plurality of cantilever-shaped partition portions 112b2. As a result, the surface area of the second opening 112b1 in contact with the hot fluid is larger than that in the absence of such a plurality of partition 112b2 (that is, when the second opening 112b1 is one large through hole). As the size increases, the heat transfer efficiency between the second portion 112b and the hot fluid increases.

Further, the base end of each of the plurality of cantilever-shaped partition portions 112b2 is the edge portion of the second opening 112b1 on the connecting portion 112c side (z-axis negative direction side) (that is, the heat of the high-temperature fluid is conducted. It is connected to the edge on the side of the road). Therefore, the heat of the high-temperature fluid is connected as compared with the embodiment in which the base end of each of the plurality of partition portions 112b2 is connected to the edge portion at a position different from the edge portion on the connecting portion 112c side in the second opening 112b1. It can be efficiently conducted to the portion 112c.

Further, the tip (free end) of each of the plurality of cantilever-shaped partition portions 112b2 is not connected to the edge portion of the second opening 112b1 opposite to the connecting portion 112c side (z-axis positive direction side) (that is,). , An air layer intervenes between the tip and the edge). Therefore, the tip of each of the plurality of partition portions 112b2 is also connected to the edge portion on the side opposite to the connecting portion 112c side of the second opening portion 112b1 (that is, the plurality of partition portions 112b2 each extend in parallel with each other. The temperature of the plurality of partition portions 112b2 is relatively low as compared with the mode having a beam-like shape) "the edge portion of the second opening 112b1 opposite to the connecting portion 112c side". It becomes difficult for the phenomenon of decrease due to the influence of As a result, the temperature of the plurality of partition portions 112b2 can be maintained at a high temperature, so that the heat transfer efficiency between the high-temperature fluid and the working gas is increased.

The present invention is not limited to the above-mentioned typical embodiments, and various applications and modifications can be considered as long as the object of the present invention is not deviated. For example, the following embodiments to which the above embodiments are applied can also be implemented.

In the above embodiment, the first opening 112a1 of the first portion 112a is partitioned by a plurality of cantilever-shaped partition portions 112a2, but may be partitioned by a plurality of double-sided beam-shaped partition portions 112a2. .. Further, the base ends of the plurality of cantilever-shaped partition portions 112a2 are connected to the edge portion of the connecting portion 112c side (z-axis positive direction side) of the first opening 112a1, but the connection at the first opening 112a1. It may be connected to an edge portion at a position different from that of the portion 112c side.

Further, in the above embodiment, the second opening 112b1 of the second portion 112b is partitioned by a plurality of cantilever-shaped partition portions 112b2, but is partitioned by a plurality of double-sided beam-shaped partition portions. May be good. Further, the base ends of the plurality of cantilever-shaped partition portions 112b2 are connected to the edge portion of the connecting portion 112c side (z-axis negative direction side) in the second opening portion 112b1, but the connection in the second opening portion 112b1. It may be connected to an edge portion at a position different from that of the portion 112c side. Furthermore, such a plurality of partition portions 112b2 may not be present (that is, the second opening portion 112b1 may be one large through hole).

Further, in the above embodiment, the high temperature side heat exchanger 112 is composed of one solid member having a long plate shape, but may be formed by laminating thin plate members having the same shape in a plan view. When the high temperature side heat exchanger 112 is composed of one solid member having a relatively large plate thickness, in order to form a plurality of cantilever-shaped partition portions 112a2 and 112b2 having a very complicated shape. , The high temperature side heat exchanger 112 needs to be manufactured by wire cut electric 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 working or the like, so that the manufacturing cost of the high temperature side heat exchanger 112 is reduced. It is possible to do.

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

By providing the slit 112d in this way, the heat of the outer edge portion of the high temperature side heat exchanger 112 and the central portion excluding the outer edge portion (that is, the heat of the high temperature fluid is conducted from the second portion 112b to the first portion 112a). An air layer intervenes between the main route and the air layer. Therefore, the temperature of the central portion of the high temperature side heat exchanger 112 is relatively low as compared with the case where such a slit 112d is not provided at all (see FIG. 4). The phenomenon of lowering due to the influence of the outer edge of 112 is less likely to occur. As a result, the temperature of the central portion of the high temperature side heat exchanger 112 can be maintained at a high temperature, so that the heat transfer efficiency between the high temperature fluid and the working gas becomes high.

110 ... thermoacoustic engine, 102 ... annular pipe (thermoacoustic pipe), 111 ... heat storage, 111a ... one end, 111b ... other end, 111c ... multiple channels, 112 ... high temperature side heat exchanger, 112a ... 1st part, 112a1 ... 1st opening, 112a2 ... Partition, 112b ... 2nd part, 112b1 ... 2nd opening, 112b2 ... Partition, 112c ... Connecting part, 112d ... Slit, 113 ... Low temperature side heat exchanger

Claims (2)

A thermoacoustic engine built into a thermoacoustic pipe filled with working gas.
A heat storage device having a plurality of flow paths penetrating in the longitudinal direction of the thermoacoustic pipe,
A high-temperature side heat exchanger that is connected to one end of the heat storage device in the longitudinal direction and heats the one end of the heat storage device.
A low-temperature side heat exchanger connected to the other end of the heat storage device in the longitudinal direction and cooling the other end of the heat storage device.
With
The high temperature side heat exchanger is
A first portion which is connected to the one end portion of the heat storage device, communicates with the plurality of flow paths, and has a first opening which is a through hole through which the working gas passes.
A second portion located outside the thermoacoustic pipe and inserted into a flow path through which a fluid having a temperature higher than normal temperature passes, and a second opening formed as a through hole through which the fluid passes.
A connecting portion that integrally extends from the first portion to the outside of the thermoacoustic pipe and integrally connects the first portion and the second portion.
Consists of a solid material with thermal conductivity,
The first opening is partitioned by a partition .
A thermoacoustic engine in which a slit, which is a through hole along the outer edge, is formed in a portion near the outer edge of the high temperature side heat exchanger. In the thermoacoustic engine according to claim 1.
The partition portion has a thermoacoustic shape extending in parallel with each other from the edge portion on the connecting portion side of the first opening to the vicinity of the edge portion on the opposite side to the connecting portion side. engine.

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