JP2005069168A - Stirling engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Stirling engine, facilitating forming of a pressure container (a shell structure) so as to reduce the production cost. <P>SOLUTION: This Stirling refrigerator includes: a cylinder 1 assembled to a pressure container; a piston 3 reciprocating in the cylinder 1; a displacer 3 reciprocating with a phase lag to the piston 3 in the cylinder 1; a compression space 6 between the piston 3 and the displacer 2; an expansion space on the opposite side of the piston 3 to the displacer 2; a regenerator 13 disposed in a communicating passage communicating te compression space 6 with the expansion space 5 in the pressure container; a heat sink 7 (a first heat exchanger) provided on the expansion space 5 side of the regenerator 13 in the interior of the pressure container; and a radiator 8 (a second heat exchanger) on the compression space 6 side of the regenerator 13. The pressure container includes: a shell tube 21 as a cylindrical member and a panel board 20 as a cap member mounted on the inside of the end part on the expansion space 5 side of the shell tube 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a Stirling engine, and more particularly, to a Stirling engine that obtains low temperature / high temperature or electric power or power by utilizing compression / expansion of a working gas accompanying reciprocation of a piston and a displacer.

  FIG. 15 is a side sectional view showing a conventional free piston type Stirling refrigerator (Stirling engine).

  A free piston type Stirling refrigerator shown in FIG. 15 includes a cylinder 1 in an outer shell structure, a displacer 2 that partitions the inner shell structure into an expansion space 5 and a compression space 6, a piston 3, a displacer 2, and a piston 3. , A regenerator 13 provided in a communication path communicating between the expansion space 5 and the compression space 6, and a heat absorber 7 provided on the expansion space 5 side of the regenerator 13. And a radiator 8 provided on the compression space 6 side of the regenerator 13.

  As shown in FIG. 15, the outer shell structure includes a first pressure vessel including a main body outer shell tube 16 and a main body cover 17, and a second pressure vessel including the outer shell tube 15. It is formed by joining through a vessel 11. A working gas such as helium is enclosed in the outer shell structure.

  In FIG. 15, leaf springs 9 and 10 support the displacer 2 (rod 14) and the piston 3, respectively, and reciprocate them by elastic force. The linear motor 4 is connected to an external power source via a power terminal 19.

  The heat exchanger 11 dissipates heat generated in the Stirling refrigerator to the outside of the engine, and the heat exchanger 12 transmits cold heat to the outside of the engine. Heat exchange between the inside and the outside of the Stirling refrigerator is performed through these heat exchangers 11 and 12.

  Next, operation | movement of said Stirling refrigerator is demonstrated.

  The linear motor 4 is driven using an external power source, and the piston 3 is moved to the left (in FIG. 15) inside the cylinder. Thereby, the working gas in the compression space 6 is compressed. Although the temperature of the working gas rises due to compression, it is cooled by exchanging heat with the outside air via the radiator 8 and the heat exchanger 11. Therefore, this process becomes an isothermal compression change.

  The working gas compressed by the piston 3 in the compression space 6 flows into the regenerator 13 by pressure and is sent into the expansion space 5. At that time, the heat amount of the working gas is stored in the resin film constituting the regenerator 13. The high-pressure working gas that has flowed into the expansion space 5 expands when the displacer 2 that reciprocates with the piston 3 maintaining a predetermined phase difference moves to the right (in FIG. 15). At this time, although the temperature of the working gas decreases, the working gas is heated by absorbing heat of the outside air through the heat absorber 7 and the heat exchanger 12. Therefore, this process is an isothermal expansion change.

  When the displacer 2 starts to move to the left (in FIG. 15), the working gas in the expansion space 5 passes through the regenerator 13 and returns to the compression space 6 side again. At that time, the amount of heat stored in the regenerator 13 is given to the working gas, and the working gas is heated. By repeating this series of Stirling cycles by the reciprocating motion of the drive unit, the heat absorber 7 absorbs heat from the outside air, thereby generating cold.

In this manner, the working gas can be reciprocated between the compression space 6 and the expansion space 5 via the regenerator 13 to extract the cold heat from the heat absorber 7.
JP 2001-355513 A

  However, the above Stirling refrigerator has the following problems.

  In the structure shown in FIG. 15, as the heat exchangers 11 and 12, a heat conductive material (for example, copper or copper alloy) is used in order to facilitate the movement of heat. However, the heat exchanger 12 (for heat absorption) attached to the outer side of the outer shell tube 15 needs to be manufactured by cutting out from a cylindrical shape. In this manufacturing method, a large amount of material (scrap portion) is wasted, resulting in high costs.

  In contrast, in Japanese Patent Laid-Open No. 2001-355513 (conventional example 1), there is a Stirling engine in which a base portion, an intermediate portion, and a tip portion (bottom portion) are integrally formed in a cylindrical portion on the tip side of an outer shell structure. It is disclosed.

  However, in this case, it is necessary to perform deep drawing in order to form an integral cylindrical portion. In the free piston type Stirling refrigerator, the structure around the cylinder, piston, and displacer requires particularly high dimensional accuracy, but it is difficult to obtain the high dimensional accuracy required here in deep drawing.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a Stirling having a structure in which a pressure vessel (outer shell structure) can be easily molded and, as a result, production costs can be reduced. To provide an institution.

  A Stirling engine according to the present invention includes a first pressure vessel, a second pressure vessel having a heat radiating portion and a heat absorbing portion, and forming a closed space together with the first pressure vessel, A cylinder assembled to the second pressure vessel, a piston that reciprocates within the cylinder, a displacer that reciprocates with a phase difference with respect to the piston within the cylinder, and a compression space formed between the piston and the displacer; An expansion space formed on the opposite side of the piston with respect to the displacer; a regenerator disposed in a communication path in the second pressure vessel that communicates the compression space and the expansion space; and an interior of the second pressure vessel A first heat exchanger disposed on the expansion space side of the regenerator, and a second heat exchanger disposed on the compression space side of the regenerator, wherein the second pressure vessel is a cylinder Member and the circle And a cap member which is mounted inside the expansion space side end portion of the member.

  Accordingly, it is not necessary to perform a cutting process for forming the cap member so that it can be attached to the outside of the cylindrical member or a deep drawing process for integrally forming the cylindrical portion and the bottom surface portion of the pressure vessel. As a result, the pressure vessel can be easily molded and the production cost can be reduced.

  It is preferable that the cap member is formed of a concave plate material whose central portion is recessed toward the displacer.

  Thereby, the bottom face part of a pressure vessel can be formed by inserting and joining a board | plate material inside a cylindrical member. Therefore, it is easy to mold the pressure vessel.

  The Stirling engine preferably further includes a transmission member that transmits cold heat from the cap member to the cylindrical member.

  Thereby, in the dead space which does not contribute to generation | occurrence | production of cold, since the transmission efficiency of cold can be improved, the operating efficiency of a Stirling engine can be improved.

  In one aspect, the transmission member preferably includes an inner cylindrical portion provided so as to contact the inner peripheral surface of the cylindrical member.

  Thereby, said cold heat transfer effect can be heightened. The cylindrical member also functions as a positioning means for the heat exchanger.

  In another aspect, the transmission member has a bottom surface portion and a cylindrical portion, the bottom surface portion abuts on the cap member, and the cylindrical portion is sandwiched between the cylindrical member and the first heat exchanger. May be.

  Thereby, the cold heat of the whole cap member can be efficiently transmitted to a heat exchanger.

  Here, it is preferable to provide a step between the bottom surface portion and the cylindrical portion.

  The heat exchanger can be positioned by this step portion.

  The thermal conductivity of the transmission member is preferably higher than the thermal conductivity of the cylindrical member and the cap member.

  Thereby, the transmission efficiency of the cold heat mentioned above can further be improved.

  The Stirling engine further includes an outer cylindrical member that extends so as to cover at least one of the first and second heat exchangers, abuts on the outer peripheral surface of the cylindrical member, and has a higher thermal conductivity than the cylindrical member. It is preferable to provide.

  Thereby, the efficiency which the cold heat produced in expansion space transmits to an external heat exchanger can be improved.

  According to the present invention, there is no need to perform a cutting process for forming a cap member of a low temperature portion of a Stirling engine or a deep drawing process for integrally forming a cylindrical portion and a bottom surface portion of a pressure vessel. Can be easily formed, and the production cost can be reduced.

  Embodiments of a free piston type Stirling refrigerator as a Stirling engine based on the present invention will be described below with reference to FIGS.

  In each embodiment to be described later, a free piston type Stirling refrigerator as an example of a Stirling engine will be described. However, the contents described here are not limited to a Stirling refrigerator, but other Stirling engines such as a Stirling engine, for example. Needless to say, the same effect can be obtained when applied to an engine.

(Embodiment 1)
1 is a side sectional view showing a Stirling refrigerator according to Embodiment 1. FIG.

  As shown in FIG. 1, the Stirling refrigerator according to the present embodiment includes a main body outer tube 23 and a main body cover 24 as a first pressure vessel, a heat radiating portion, and a heat absorbing portion. And a second pressure vessel forming a closed space, a cylinder 1 assembled to the first and second pressure vessels enclosing the working medium, a piston 3 reciprocating in the cylinder 1, and a piston in the cylinder 1 A displacer 2 that reciprocates with a phase difference with respect to 3, a compression space 6 formed between the piston 3 and the displacer 2, an expansion space 5 formed on the opposite side of the piston 3 with respect to the displacer 2, The regenerator 13 is disposed in a communication passage that communicates the compression space 6 and the expansion space 5 in the second pressure vessel, and is disposed on the expansion space 5 side of the regenerator 13 inside the second pressure vessel. The heat absorber 7 (first heat exchanger) and the radiator 8 (second heat exchanger) disposed on the compression space 6 side of the regenerator 13, the second pressure vessel is The outer shell tube 21 as a cylindrical member, and the end plate 20 as a cap member mounted inside the end portion of the outer shell tube 21 on the side of the expansion space 5 are included.

  The internal space of the outer shell structure of the Stirling refrigerator is divided into two spaces by the piston 3. One of the spaces is a working space (expansion space 5 and compression space 6) on the displacer 2 side (hereinafter referred to as a tip side) when viewed from the piston 3, and the other is a working space when viewed from the piston 3. Is a back space on the opposite side (hereinafter referred to as the rear end side). These spaces are filled with a working medium such as high-pressure helium gas. The expansion space 5 and the compression space 6 are connected via a regenerator 13.

  The displacer 2 has a rod 14 that passes through a sliding hole provided in the central portion of the piston 3. The rod 14 and the piston 3 are connected to leaf springs 9 and 10, respectively.

  The piston 3 is driven by a linear motor 4 and reciprocates at a predetermined cycle. Here, the linear motor is connected to an external power supply via the power supply terminal 19. The working medium is compressed / expanded in the working space by the reciprocating motion of the piston 3. The displacer 2 reciprocates linearly by a pressure change accompanying the compression / expansion of the working medium. At this time, the piston 3 and the displacer 2 reciprocate at the same period with a predetermined phase difference.

  In the Stirling refrigerator configured as described above, a gas seal is provided between the cylinder sliding surface and the piston sliding surface and between the rod 14 and the rod sliding hole to block the working space and the back space. ing. In addition, this gas seal is implement | achieved by providing a seal ring between the members to contact, or fitting both members with high precision.

  As a result of the above-described reciprocating motion, for example, effects such as generation of cold in the heat absorber 7 can be obtained. The cold heat generation mechanism is the same as that of a conventional Stirling engine, and thus the description thereof is omitted here. The cold heat is transmitted to the outside of the Stirling refrigerator via the external heat exchanger. Here, the external heat exchanger (for heat absorption) is provided in the vicinity of the heat absorber 7. For example, the external heat exchanger (for heat absorption) may be installed adjacent to the heat absorber 7 in the expansion space 5, or the outer shell tube 21. You may install so that it may contact | abut to the outer peripheral surface of the heat absorber 7 vicinity. Note that an external heat exchanger (for heat radiation) similar to the above is also provided in the vicinity of the heat radiator 8.

  Next, structural features of the outer shell structure of the Stirling refrigerator according to the present embodiment will be described.

  The outer tube 21 and the end plate 20 are joined by welding or brazing. The second pressure vessel thus formed is joined to the first pressure vessel (the main body outer shell tube 23 and the main body cover 24) via the holding ring 22. Thereby, the outer shell part of a Stirling refrigerator is formed, and a Stirling refrigerator is formed by incorporating components such as the cylinder 1 into the outer shell part.

  As a whole, the end plate 20 is formed of a concave plate material whose central portion is recessed toward the displacer 2 side. The shape of the bottom portion of the recess will be described in more detail. As shown in FIG. 1, the central portion protrudes on the side opposite to the displacer 2.

  In this manner, the outer shell tube 21 and the end plate 20 constituting the outer shell portion are separately precision processed separately, and these are connected and assembled by brazing or welding to obtain the required high assembly accuracy. Can do.

  In addition, as the end plate 20 and the outer shell tube 21, for example, an iron material or a stainless material is used in consideration of workability and the like.

  By the way, the shape of the end plate 20 is determined so as to withstand the internal pressure of the enclosed gas. However, the connection portion between the end plate 20 and the outer shell tube 21 has no relation to the compression / expansion of the working medium, and generates cold heat. A space that does not contribute (hereinafter referred to as the dead space) is formed. If this dead space is large, the operating efficiency of the Stirling refrigerator will decrease.

  On the other hand, in the Stirling refrigerator according to the present embodiment, as shown in FIG. 1, the cap member is installed between the inner peripheral surface of the outer shell tube 21 as a cylindrical member and the end plate 20 as a cap member. A filling member 25 is provided as a transmission member for transmitting cold heat from the cylindrical member to the cylindrical member. Thereby, since the dead space is filled with the filling member 25 and the transmission efficiency of the cold heat can be increased in the space, the operating efficiency of the Stirling refrigerator can be improved.

  Here, the term “filling” means filling to such an extent that the heat conduction efficiency in the dead space is improved, and includes a case where a slight gap exists.

  In addition, as the filling member 25, it is preferable to use a member having a thermal conductivity higher than that of the end plate 20 and the outer shell tube 21. As such a material, for example, copper, aluminum, a high thermal conductive resin material, and the like can be considered.

  Thereby, the transmission efficiency of the cold heat mentioned above can further be improved.

  FIG. 2 shows a single product diagram of the filling member 25, (a) shows a side sectional view, and (b) shows a front view. When the heat absorber 7 is attached to the outer shell tube 21, a protrusion 25 a that abuts the end 7 b of the heat absorber 7 is provided at the end of the filling member 25 in order to secure a flow path for the internal gas.

  FIG. 3 is a diagram showing a single product diagram (front view) of the heat absorber 7.

  As shown in FIG. 3, the heat absorber 7 in this embodiment is formed by bending a thin plate made of a material having high thermal conductivity (for example, copper) into a ring shape, and joining the end portions thereof with solder or the like. Is formed.

  Next, a method for inserting and attaching the heat absorber 7 to the outer shell tube 21 will be described.

  First, the heat absorber 7 is inserted into the outer tube 21. Thereafter, the heat absorber 7 is pressed and fixed to the outer shell tube 21 by inserting the pressing ring 7a.

  About the shape regarding the above heat sink 7, and the attachment method, it is the same also in the case of the radiator 8 (using the pressing ring 8a).

  Further, when inserting the pressing ring 7a of the heat absorber 7, the heat absorber 7 is also pressed in the direction of the end plate 20 by the pressing ring 7a. On the other hand, in order to optimize the flow of the working medium (internal gas) at the end 7b of the heat absorber 7, the height of the protrusion 25a (H in FIG. 2A) can be adjusted.

  In the present embodiment, with the above configuration, the cold heat generated in the expansion space 5 can be efficiently transmitted to the heat absorber 7. Since an external heat exchanger that transmits cold heat to the outside is installed near the heat absorber 7, as a result, the heat exchange efficiency between the inside and the outside of the Stirling refrigerator is improved.

(Embodiment 2)
FIG. 4 is a side sectional view of an end portion (hereinafter referred to as a tip portion) on the expansion space side of the Stirling refrigerator according to the second embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the first embodiment. As shown in FIG. 4, in addition to the filling member 25 described above, the outer shell tube is used as a transmission member. 21 is different from the first embodiment in that it includes a cylindrical member 26 (inner cylindrical member) provided so as to be in contact with the inner peripheral surface of 21.

  Since other items are the same as those in the first embodiment, the description thereof is omitted.

  In FIG. 4, in the outer shell portion where the outer shell tube 21 and the end plate 20 and the holding ring 22 and the main body outer tube 23 are connected by brazing or welding, the connecting portion between the end plate 20 and the outer shell tube 21 is connected. After the cylindrical member 26 along the inner wall surface of the outer shell tube 21 is fitted into the formed dead space portion, the filling member 25 for minimizing the dead space is fitted. Here, when the heat absorber 7 is mounted, the cylindrical member 26 functions as a positioning means for the heat absorber 7.

  Further, by forming the cylindrical member 26 with a good heat conductive material such as copper or aluminum, cold heat is easily transmitted to the heat absorber 7, and as a result, heat between the inside and the outside of the Stirling refrigerator is obtained. The conduction efficiency can be improved.

  Here, the good heat conductive material means a material having a higher thermal conductivity than the iron material and the stainless steel material used for the end plate 20 and the outer shell tube 21.

(Embodiment 3)
FIG. 5 is a side cross-sectional view of the tip portion of the Stirling refrigerator according to the third embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the second embodiment. As shown in FIG. 5, the cylindrical member 27 serving as the inner cylindrical member is attached to the heat absorber 7. The second embodiment is different from the second embodiment in that it extends so as to reach the maximum.

  Since other matters are the same as those in the above-described embodiments, description thereof is omitted.

  In FIG. 5, in the outer shell portion in which the outer shell tube 21 and the end plate 20 and the holding ring 22 and the main body outer tube 23 are connected by brazing or welding, the connecting portion between the end plate 20 and the outer shell tube 21 is connected. After the cylindrical member 27 which reaches the attachment position of the heat sink 7 along the inner wall surface of the outer shell tube 21 is fitted in the resulting dead space portion, a filling member 25 that minimizes the dead space is fitted. Yes. Here, when the heat absorber 7 is mounted, the filling member 25 functions as a positioning means for the heat absorber 7.

  The cylindrical member 27 is made of a heat-conductive material such as copper or aluminum so that cold heat can be easily transmitted to the heat absorber 7.

  FIG. 6 is a single item diagram of the cylindrical member 27. The cylindrical member 27 has a simple cylindrical shape. However, when the cylindrical member 27 is cut into one place and inserted into the outer tube 21, the outer diameter is made smaller than the inner diameter of the outer tube 21, It is also conceivable that the heat sink 7 can be easily inserted into the inner portion of the shell tube 21 and fixed to the outer shell tube 21 together with the heat absorber 7 by the pressing ring 7a of the heat absorber 7 when the heat absorber 7 is fitted.

  Alternatively, the cylindrical member 27 may be divided into a plurality of pieces and inserted into the outer tube 21 and pressed against the outer tube 21 together with the heat absorber 7 by the pressing ring 7a.

(Embodiment 4)
FIG. 7 is a side cross-sectional view of the distal end portion of the Stirling refrigerator according to the fourth embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the first embodiment, and includes a bottom surface portion 28a and a cylindrical portion 28b as transmission members as shown in FIG. The bottom portion 28a is in contact with the end plate 20, and the cylindrical portion 28b is different from the first embodiment in that it includes a bottomed cylindrical member 28 (a bottomed inner cylindrical member) sandwiched between the outer shell tube 21 and the heat absorber 7.

  Since other matters are the same as those in the above-described embodiments, description thereof is omitted.

  With the above configuration, the cold heat of the entire end plate 20 can be efficiently transmitted to the heat absorber 7 via the bottomed cylindrical member 28.

  In FIG. 7, in the outer shell portion in which the outer shell tube 21 and the end plate 20 are connected to each other, and the holding ring 22 and the main body outer shell tube 23 are connected by brazing or welding, the connecting portion between the end plate 20 and the outer shell tube 21 is connected. A filling member 25 for minimizing the formed dead space portion is fitted, and the bottom surface portion 28a abuts along the inner wall surface of the end plate 20, and the cylindrical portion 28b extends to reach the heat absorber 7 mounting position. In addition, a bottomed cylindrical member 28 that is pressed against the outer shell tube 21 together with the heat absorber 7 by the pressing ring 7a is mounted. With this configuration, cold heat (especially cold heat near the central portion of the bottom surface of the end plate 20) is easily transmitted to the heat absorber 7, and as a result, the heat conduction efficiency between the inside and the outside of the Stirling refrigerator can be improved. .

(Embodiment 5)
FIG. 8 is a side cross-sectional view of the tip of the Stirling refrigerator according to the fifth embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the fourth embodiment. As shown in FIG. 8, the bottom surface portion and the cylindrical portion of the bottomed cylindrical member 29 as a transmission member, The fourth embodiment differs from the fourth embodiment in that a stepped portion 29a is provided between them.

  Since other matters are the same as those in the above-described embodiments, description thereof is omitted.

  In FIG. 8, a step is provided in the connecting portion between the bottom surface portion and the cylindrical portion of the bottomed cylindrical member 29, and the heat absorber 7 hits the step portion 29 a, thereby positioning the heat absorber 7 and the heat absorber. An internal gas flow path in the vicinity of the tip of the gas can be secured.

  FIG. 9 is a single product diagram showing a bottomed cylindrical member 29 including a stepped portion 29a. FIG. 10 shows the bottomed cylindrical member 29 divided into two parts. As shown in FIG. 10, by dividing the bottomed cylindrical member 29 into two, the cylindrical member can be easily fitted into the outer shell tube 21.

(Embodiment 6)
FIG. 11 is a side sectional view of a Stirling refrigerator according to the sixth embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the first embodiment, and as shown in FIG. 11, a heat absorber 7 and a radiator 8 (first and second heat exchanges). A cylindrical member 30, 31 (outer cylindrical member) that extends so as to cover at least one of the container, contacts the outer peripheral surface of the outer shell tube 21, and has a higher thermal conductivity than the outer shell tube 21. This is different from the first embodiment.

  With this configuration, for example, according to the cylindrical member 30, the efficiency of transmitting the cold heat of the heat absorber 7 to the outside can be increased. As a result, the heat exchange efficiency between the inside and the outside of the Stirling refrigerator can be improved. The cylindrical member 31 has the same effect.

  Since other matters are the same as those in the above-described embodiments, description thereof is omitted.

  In FIG. 11, the outer wall surface of the outer shell tube 21 where the heat absorber 7 and the radiator 8 are attached is larger in width than the heat absorber 7 and the radiator 8, for example, good thermal conductivity such as copper or aluminum. Cylindrical members 30 and 31 made of materials are attached in close contact.

  When the above Stirling refrigerator is actually attached to a refrigerator or the like, an external heat exchanger (not shown) is attached to the outside of the cylindrical members 30 and 31. At that time, the cylindrical members 30 and 31 efficiently transfer heat not only from the portions directly above the heat absorber 7 and the radiator 8 but also to the outer shell tube 21 in the peripheral portion thereof to the external heat exchanger. , Heat can be taken in and out better.

  In the present embodiment, the cylindrical members 30 and 31 have an inner diameter slightly smaller than the outer diameter of the outer tube and are cut in one axial direction, so that the inner diameter can be finely adjusted. ing. Thus, when the cylindrical members 30 and 31 are inserted into the outer peripheral surface of the outer shell tube 21, the members 30 and 31 can be fitted while pressing the outer peripheral surface of the outer shell tube 21. Furthermore, after attaching the cylindrical members 30 and 31, the members 30 and 31 are fixed to the outer peripheral surface of the outer shell tube 21 by mounting an external heat exchanger (not shown) on the outer peripheral surface thereof.

(Embodiment 7)
FIG. 12 is a side sectional view of a Stirling refrigerator according to the seventh embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the sixth embodiment. As shown in FIG. 12, a cylindrical member 32 (an outer cylinder) extending to cover the radiator 8 is provided. The member is different from that of the sixth embodiment in that it includes a flange.

  Since other matters are the same as those in the above-described embodiments, description thereof is omitted.

  In FIG. 12, the cylindrical member 32 includes a cylindrical portion 32a and a flange portion 32b. The cylindrical member 32 is attached to the outer shell tube 21 and is in close contact with the holding ring 22 that holds the outer shell tube 21. Therefore, heat transferred from the radiator 8 to the holding ring 22 side through the outer shell tube 21 and heat transferred directly from the compression space 6 to the holding ring 22 are efficiently transferred to the cylindrical portion 32a via the flange portion 32b. Can be heated. As a result, the heat transfer efficiency to the external heat exchanger (not shown) for heat radiation attached to the outer peripheral surface of the cylindrical portion 32a can be improved.

(Embodiment 8)
FIG. 13 is a single product diagram showing a cylindrical member 33 installed in the heat radiating section in the Stirling refrigerator according to the present embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the seventh embodiment. As shown in FIG. 13, a plurality of cylindrical members (cylindrical members 33) installed in the heat radiating section ( The second embodiment is different from the seventh embodiment in that it is divided into two.

  By dividing the cylindrical member 33 into two parts, the member 33 can be easily attached to the outer shell tube 21.

  Since other matters are the same as those in the above-described embodiments, description thereof is omitted.

(Embodiment 9)
FIG. 14 is a side sectional view of a Stirling refrigerator according to the ninth embodiment.

  The Stirling refrigerator according to the present embodiment is a modification of the Stirling refrigerator according to the first embodiment, and is used for absorbing heat made of a good heat conductor such as copper at both ends of the outer tube 21. It differs from Embodiment 1 in the point provided with the cylindrical body 34 and the cylindrical body 35 for heat radiation.

  Here, the outer shell tube 21 and the cylindrical bodies 34 and 35 are joined by brazing. The end plate 20 is brazed to the cylindrical body 34, and the cylindrical body 35 is joined to the main body outer tube 23 via the holding ring 36. The cylindrical body 35 and the holding ring 36 are joined by brazing or welding.

  Since other matters are the same as those in the above-described embodiments, description thereof is omitted.

  As shown in FIG. 14, since the heat absorber 7 and the heat radiator 8 are attached in close contact with the inside of the cylindrical body 34 (for heat absorption) and the cylindrical body 35 (for heat dissipation), heat generated in the respective portions. However, heat is efficiently transferred to the outside of the Stirling refrigerator.

  In a conventional Stirling refrigerator, a cap member used as a heat exchanger for absorbing heat has been cut out from a rod-shaped member by cutting. For this reason, both processing and material were wasteful. On the other hand, in the present embodiment, since the cylindrical bodies 34 and 35 are formed by cutting from a cylindrical member, the above-described processing and material waste can be minimized.

  In FIG. 14, the example which joined the cylindrical body shape | molded from the cylindrical member made from good heat conductors, such as copper, to both the heat absorption side and the heat radiation side was shown, but this was employ | adopted only on the heat absorption side. Even in the case, the same effect as described above can be obtained in the heat absorbing portion.

  In addition, it is scheduled from the beginning to obtain a combined effect by combining the features of the respective embodiments described above.

  Although the embodiments of the present invention have been described above, the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a sectional side view of the Stirling refrigerator concerning Embodiment 1 of the present invention. In FIG. 1, it is a single-piece figure of the filling member installed between an outer shell tube and an end plate, (a) is a sectional side view, (b) is a front view. It is a front view of the heat sink installed in the Stirling refrigerator of FIG. It is a sectional side view of the front-end | tip part of the Stirling refrigerator which concerns on Embodiment 2 of this invention. It is a sectional side view of the front-end | tip part of the Stirling refrigerator which concerns on Embodiment 3 of this invention. It is a single item figure of the cylindrical member installed in the Stirling refrigerator of FIG. 5, (a) is a sectional side view, (b) is a front view. It is a sectional side view of the front-end | tip part of the Stirling refrigerator which concerns on Embodiment 4 of this invention. It is a sectional side view of the front-end | tip part of the Stirling refrigerator which concerns on Embodiment 5 of this invention. It is a single-piece figure of the bottomed cylindrical member installed in the Stirling refrigerator of FIG. 8, (a) is a sectional side view, (b) is a front view. It is a single item figure of the modification of a bottomed cylindrical member installed in the Stirling refrigerator of FIG. 8, (a) is a sectional side view, (b) is a front view. It is a sectional side view of the Stirling refrigerator which concerns on Embodiment 6 of this invention. It is a sectional side view of the Stirling refrigerator which concerns on Embodiment 7 of this invention. It is a single-piece figure of the cylindrical member with a flange installed in the Stirling refrigerator which concerns on Embodiment 8 of this invention, (a) is a sectional side view, (b) is a front view. It is a sectional side view of the Stirling refrigerator which concerns on Embodiment 9 of this invention. It is a sectional side view of the conventional Stirling refrigerator.

Explanation of symbols

  1 cylinder, 2 displacer, 3 piston, 4 linear motor, 5 expansion space, 6 compression space, 7 heat absorber, 7a pressing ring (for heat absorber), 7b end (heat absorber) 8 heat radiator, 8a pressing ring (for heat radiator) ), 9 leaf spring (for displacer), 10 leaf spring (for piston), 11 heat exchanger (for heat dissipation), 12 heat exchanger (for heat absorption), 13 regenerator, 14 rod, 15, 21 outer tube, 16, 23 Main body outer tube, 17, 24 Main body cover, 18 Retaining ring (for heat exchanger), 19 Power supply terminal, 20 End plate, 22 Retaining ring (outer shell tube), 25 Filling member, 25a Protruding part, 26, 27 Cylindrical member, 28, 29 Bottomed cylindrical member, 28a Bottom portion, 28b Cylindrical portion, 29a Stepped portion, 30 Cylindrical member (heat absorber side), 31 cylinder Material (heatsink side), 32 Cylindrical member (with flange), 32a Cylindrical portion, 32b Flange portion, 33 Cylindrical member (2-split method), 34 Cylindrical body (for heat absorption), 35 Cylindrical body (for heat dissipation), 36 Holding Ring (heat radiating cylinder).

Claims (8)

A first pressure vessel;
A second pressure vessel having a heat radiating portion and a heat absorbing portion and forming a closed space together with the first pressure vessel;
A cylinder assembled to the first and second pressure vessels enclosing the working medium;
A piston that reciprocates within the cylinder;
A displacer that reciprocates with a phase difference with respect to the piston in the cylinder;
A compression space formed between the piston and the displacer;
An expansion space formed on the opposite side of the piston with respect to the displacer;
A regenerator disposed in a communication path in the second pressure vessel and communicating the compression space and the expansion space;
A first heat exchanger disposed on the expansion space side of the regenerator inside the second pressure vessel; and a second heat exchanger disposed on the compression space side of the regenerator. ,
The second pressure vessel is a Stirling engine including a cylindrical member and a cap member attached to the inside of the expansion space side end of the cylindrical member.   The Stirling engine according to claim 1, wherein the cap member is formed of a concave plate material having a central portion recessed toward the displacer.   The Stirling engine according to claim 1, further comprising a transmission member that transmits cold heat from the cap member to the cylindrical member.   The Stirling engine according to claim 3, wherein the transmission member includes an inner cylindrical portion provided so as to abut on an inner peripheral surface of the cylindrical member.   The transmission member has a bottom surface portion and a cylindrical portion, the bottom surface portion abuts on the cap member, and the cylindrical portion is sandwiched between the cylindrical member and the first heat exchanger. The Stirling engine according to claim 3.   The Stirling engine according to claim 5, wherein a step is provided between the bottom surface portion and the cylindrical portion.   The Stirling engine according to any one of claims 3 to 6, wherein a thermal conductivity of the transmission member is higher than a thermal conductivity of the cylindrical member and the cap member.   An outer cylindrical member that extends so as to cover at least one of the first and second heat exchangers, contacts an outer peripheral surface of the cylindrical member, and has a higher thermal conductivity than the cylindrical member. The Stirling engine according to any one of claims 1 to 7.

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