JP3685702B2 - Cylinder block for heat engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder block for a heat engine of a Stirling cycle device such as a Stirling refrigerator, a Virmier cycle device, or a Kuak-Yarborov cycle device.
[0002]
[Prior art]
In recent years, it has been used as a refrigeration device in place of CFCs for global environmental problems and has a wider operating temperature than conventional refrigeration equipment. Application to refrigeration equipment in all industrial fields such as liquid circulators, low temperature thermostats, thermostats, heat shock test equipment, freeze dryers, temperature characteristics test equipment, blood / cell storage equipment, cold coolers, and other various refrigeration equipment Stirling refrigerators are in the spotlight as possible refrigerators that are compact, have high coefficient of performance, and have good energy efficiency.
[0003]
By the way, in the Stirling refrigerator, the working gas flows between the compression chamber (high temperature chamber) and the expansion chamber (low temperature chamber), and an endothermic heat exchanger (low temperature side heat exchange) disposed along this flow path. ) And heat dissipation heat exchanger (high temperature side heat exchanger), heat exchange with the cold heat refrigerant and the heat dissipation refrigerant is performed, respectively. Conventionally, examples of the heat exchanger include a shell and tube heat exchanger and a plate fin heat exchanger.
[0004]
In order to improve the heat exchange performance and reliability, the heat exchanger in the Stirling refrigerator has a flow path that flows uniformly without partially obstructing the flow of working gas, and a precise thickness that is uniform. The formed fins and the like are required, and furthermore, in order to realize cost reduction, the heat exchanger itself is excellent in workability, and a configuration that simplifies the entire structure of the Stirling refrigerator is required.
[0005]
The shell-and-tube heat exchanger is time-consuming to assemble and there is a problem in reducing the cost, and the plate fin heat exchanger also has a problem in cost. As means for solving the above problems, the present inventors are characterized in that circumferential fins and longitudinal narrow grooves for working fluid are integrally formed by lost wax casting on the outer peripheral surface and the inner peripheral surface. A cylinder block for a heat engine has been proposed (see Japanese Patent Application No. 10-365364).
[0006]
The features of the cylinder block for a heat engine according to the preceding invention will be briefly described with reference to FIG. 5 by taking a heat-dissipating heat exchanger (high-temperature side heat exchanger) as an example. 5A and 5B are a cross-sectional view and a CC cross-sectional view of the heat-dissipating heat exchanger, and FIG. 5C is an enlarged view of a main part. The heat-dissipating heat exchanger 27 is an annular type heat exchanger, and a heat exchanger body 45 is mounted in a high-temperature side heat exchange housing 44 via a seal 47 so that the inner cylinder 31 is in close contact therewith. It is assembled.
[0007]
Fins 50 and fine grooves 51 for working fluid are integrally formed on the outer peripheral surface and inner peripheral surface of the heat exchanger main body 45 by lost wax casting. A heat exchange medium such as cooling water flows from the inlet 48 into the flow path 46 and flows out from the outlet 49. On the other hand, the working fluid passes through a narrow groove passage formed by the narrow groove 51 and the inner cylinder 31. Thereby, the heat of the working fluid is radiated to the heat exchange medium, and heat exchange is performed.
[0008]
[Problems to be solved by the invention]
The heat dissipation heat exchanger has a structure in which fins and narrow grooves are integrally formed in the heat exchanger main body by lost wax casting, so that the overall structure of the heat exchanger is simplified. By the way, the fins can be formed relatively precisely by lost wax casting. However, the narrow groove for the working fluid reduces the width of the narrow groove to improve the heat transfer performance. Since burrs and the like remain, it is necessary to remove the chips and burrs after casting, which is not sufficient in terms of improving workability in this aspect.
[0009]
An object of the present invention is to solve the improvement of the prior invention that occurs when the width of the narrow groove is reduced in this way, and it is integrally formed including the fins of the outer peripheral surface by lost wax casting. As a result, the high-temperature side and low-temperature side heat exchangers have simple structures, and even narrow grooves on the inner peripheral surface can be precisely formed without leaving debris or burrs in the grooves. It is a specific problem to eliminate the partial obstruction, improve the heat exchange performance and reliability of the cooling heat exchanger, improve workability, and reduce costs.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a cylindrical top heat exchange housing having a top wall and a side wall, and an inner cylinder disposed in the top heat exchange housing and on which a piston or a displacer of a heat engine slides. A top heat exchange housing inner cylinder is press-fitted and provided on the tip side of the top heat exchange housing, and an inner peripheral surface of the top heat exchange housing is provided on the inner peripheral surface of the top heat exchange housing. An axially straight narrow groove is formed by machining along with the outer peripheral surface of the inner cylinder, and the inner peripheral surface on the base end side of the top heat exchange housing is formed by the inner cylinder. A cylinder block for a heat engine is provided in which an annular flow path for a working gas regenerator is formed together with the outer peripheral surface of the heat engine.
[0011]
In order to solve the above-mentioned problems, the present invention is a cylinder block having an inner cylinder on which a piston or a displacer of a heat engine slides. A heat exchanger comprising a heat exchanger main body inserted and fixed inside is disposed, and heat exchange fins are formed on the outer peripheral surface of the heat exchanger main body, and the heat exchanger main body A heat exchanger inner cylinder is press-fitted on the inner side of the inner wall of the heat exchanger, and the inner surface of the inner tube of the heat exchanger is axially formed with the outer peripheral surface of the inner cylinder to form a flow path for the working gas. A linear narrow groove is formed by machining, and the space between the annular heat exchange housing and the heat exchanger body is a refrigerant passage, and the annular heat exchange housing is connected to the refrigerant passage. Refrigerant inlet and To provide a cylinder block for thermal engine, characterized in that medium outlet is formed.
[0012]
In order to solve the above-mentioned problems, the present invention provides a cylindrical top heat exchange housing having a top wall and a side wall, and an inner side that is disposed in the top heat exchange housing and in which a piston or a displacer of the heat engine slides. A cylinder block having a cylinder, and a top heat exchange housing inner cylinder is press-fitted and provided at a distal end side of the top heat exchange housing, and an inner peripheral surface of the inner cylinder of the top heat exchange housing In addition, a linear narrow groove is formed in the axial direction that forms a flow path for working gas together with the outer peripheral surface of the inner cylinder, and the inner peripheral surface on the base end side of the top heat exchange housing is An annular flow path for a working gas regenerator is formed together with the outer peripheral surface of the inner cylinder, and a cylindrical annular heat exchange housing and a heat inserted and fixed therein are formed outside the inner cylinder. A heat exchanger composed of a heat exchanger body is provided, heat exchange fins are formed on the outer peripheral surface of the heat exchanger body, and a heat exchanger is formed inside the heat exchanger body. An inner cylinder is press-fitted, and an axially straight narrow groove that forms a flow path for the working gas together with the outer peripheral surface of the inner cylinder is provided on the inner peripheral surface of the heat exchanger inner cylinder. The space between the annular heat exchange housing and the heat exchanger body is formed as a refrigerant passage, and a refrigerant inlet and a refrigerant outlet are provided in the annular heat exchange housing so that the refrigerant passage communicates. A cylinder block for a heat engine is provided.
[0013]
The top heat exchange housing may have a fin formed on the front end side outer peripheral surface integrally with the top heat exchange housing by lost wax casting or cast iron, or a fin formed separately and later attached.
[0014]
As a heat engine to which the cylinder block of the present invention can be applied, there is a Stirling cycle device, a Virmier cycle device, a Kuak-Yarborov cycle device or the like.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings based on examples. 1 to 5 are diagrams for explaining an embodiment of a cylinder block for a heat engine according to the present invention, and FIG. 1 is a Stirling that is an example of a heat engine to which the cylinder block for a heat engine according to the present invention is applied. 1 is an overall view illustrating a refrigerator 1. The housing 2 of the Stirling refrigerator 1 is formed of a casting, and the inside thereof is held in a semi-sealed state. The housing 2 is partitioned into a motor chamber 4 and a crank chamber 5 by a partition wall 3.
[0016]
The motor chamber 4 is provided with a motor 6 capable of rotating in the forward and reverse directions, and the crank chamber 5 has a crankshaft 7 for converting the rotational operation of the motor 6 into a reciprocating motion, a connecting rod 8, and a cross guide head. 9 is disposed and functions as a driving means of the Stirling refrigerator 1.
[0017]
The two crank portions 10 and 11 of the crankshaft 7 are formed with a phase difference so that the crank portion 11 moves ahead of the crank portion 10 when the motor 6 rotates forward. As this phase difference, a phase difference of about 90 degrees is generally adopted.
[0018]
A compression cylinder 12 and an expansion cylinder 13 positioned slightly above the compression cylinder 12 are disposed in the upper part of the crank chamber 5. For example, helium, hydrogen, nitrogen or the like is sealed in the compression cylinder 12 and the expansion cylinder 13 and the housing 2 as working gas. The compression cylinder 12 has a compression cylinder block 14 fixed to the housing 2 with a bolt or the like, and a compression piston 15 reciprocates in the space of the compression cylinder block 14. The upper part (compression space) of this space is the high temperature chamber 16, and the working gas in this space is compressed and becomes high temperature.
[0019]
The compression piston rod 17 connects the compression piston 15 and the cross guide head 9, and extends between the compression cylinder 12 and the crank chamber 5 through an oil seal 19. Since the reciprocating compression piston 15 reverses the sliding direction at the top dead center and the bottom dead center, the speed becomes zero, and the speed is slow near the top dead center and the bottom dead center, and the amount of change in volume per unit time is also large. It is small and has the highest speed at each intermediate point when moving from bottom dead center to top dead center and from top dead center to bottom dead center, and the amount of change in volume due to movement of compression piston 15 per unit time is also maximum. It becomes.
[0020]
On the other hand, the expansion cylinder 13 has an expansion cylinder block 20 fixed to the housing 2 with bolts or the like, and an expansion piston 21 reciprocally slides in the space of the expansion cylinder block 20 so that an upper portion of the space (expansion space) ) Is the low temperature chamber 22, and the working gas in the chamber expands to a low temperature. The expansion piston rod 23 connects the expansion piston 21 and the cross guide head 18, and extends between the expansion cylinder 13 and the crank chamber 5 through an oil seal 25. The expansion piston 21 moves ahead of the compression piston 15 by a phase of 90 degrees.
[0021]
The expansion cylinder block 20 is provided with a manifold 26 through which the working gas flows in and out of the compression space of the compression cylinder 12, and further, a heat dissipation heat exchanger (high temperature side heat exchanger) 27 and a regenerator 28. In addition, a cooling heat exchanger (low temperature side heat exchanger) 29 is sequentially communicated with each other and arranged in an annular shape.
[0022]
Near the upper end of the compression cylinder block 14, a communication hole 30 is formed to communicate the high temperature chamber 16 and the manifold 26. As a result, the high temperature chamber 16 and the low temperature chamber 22 are connected to the communication hole 30, the manifold 26, and the heat radiation chamber. The heat exchanger 27, the regenerator 28, and the cooling heat exchanger 29 are configured to sequentially communicate with each other.
[0023]
A cylinder block for a heat engine according to the present invention will be described in detail with reference to FIGS. In FIG. 2, the expansion cylinder block 20 includes an inner cylinder 31, a heat dissipation heat exchanger 27 concentrically disposed on the lower outer side of the inner cylinder 31, and a low temperature side heat exchange housing ( Top heat exchange housing) 32. The inner cylinder 31 forms a cylinder space in which the expansion piston 21 reciprocates, and the upper part 33 and the lower part 34 may be combined with each other via an O-ring 24 or may be manufactured integrally.
[0024]
3A shows the low-temperature side heat exchange housing 32, FIG. 3B is a cross-sectional view taken along line AA of FIG. 3A, and FIG. 3C is an enlarged view of a main part. 2 and 3, the low temperature side heat exchange housing 32 has a cylindrical shape, and includes a top wall 35, a side wall 36, and a lower end flange portion 37. A fin 38 and an intermediate flange 38 'are formed on the outer peripheral surface of the side wall 36 at the front end side (upper side in the figure). The top wall 35 is composed of a flange top wall portion 35 ′ and a central top wall portion 35 ″. The central top wall portion 35 ″ is welded to the inner surface of the top end of the side wall 36, as indicated by W in FIG. Integrated. The top wall 35 may be integrally formed with the side wall 36 by lost wax casting, machining, or the like, which will be described later.
[0025]
A top heat exchange housing inner cylinder 32 ′ is press-fitted on the inner peripheral surface on the front end side of the side wall 36, and is integrally formed as if it forms a part of the side wall 36. The top heat exchange housing inner cylinder 32 ′ is a cylindrical part formed of a material such as copper or aluminum separately from the side wall 36. As described above, the top heat exchange housing inner cylinder 32 ′ is smoothly formed so that it can be press-fitted into the inner peripheral surface of the distal end side of the side wall 36. A large number of grooves 39 are formed at intervals in the circumferential direction.
[0026]
The narrow grooves 39 are formed by machining such as wire cutting and broaching. The pitch p ₁ shown in FIG. 3C is about ₁ to 1.5 mm, and the depth d ₁ is 1.5. About 3 mm. The thickness t ₁ of the top heat exchange housing inner cylinder 32 ′ itself is about 5 to 6 mm, which is a narrower pitch than the fins 38.
[0027]
The inner surface of the top heat exchange housing inner cylinder 32 ′ is assembled so as to be in close contact with the outer surface of the inner cylinder 31, and the working gas flow path is formed by the narrow groove 39 and the outer surface of the inner cylinder 31. In this way, the top (cold head 40) of the low temperature side heat exchange housing 32 forms a cooling heat exchanger (low temperature side heat exchanger) 29. The cold head 40 comes into contact with air, water, alcohol, or other cold refrigerant to cool the cold refrigerant.
[0028]
An annular recess 41 is formed in the lower inner peripheral surface of the low temperature side heat exchange housing 32, and an annular space 42 is formed together with the lower end portion of the top heat exchange housing inner cylinder 32 'and the inner cylinder 31, and a metal mesh or the like is formed therein. The regenerator material is filled to form a regenerator 28. The flange portion 37 at the lower end of the low temperature side heat exchange housing 32 is placed on the flange portion 43 at the upper end of the heat exchanger 27 for heat radiation.
[0029]
The low temperature side heat exchange housing 32 of the present invention is cast by a lost wax method or the like with a material such as SUS, except for the top heat exchange housing inner cylinder 32 '. That is, the low temperature side heat exchange housing 32 of the present invention has a cooling fin 38 on the outer peripheral surface and a narrow groove 39 for the working gas flow passage formed on the inner peripheral surface. The cylinder 32 'is press-fitted and configured.
[0030]
Thus, the low temperature side heat exchange housing 32 manufactured by the lost wax casting has a cooling fin 38 formed on its outer surface precisely cast in a fine bowl shape, and thus has extremely excellent heat dissipation performance and is formed on the inner surface. The machined axial narrow groove 39 can be finely formed without leaving any burrs, and can be made to flow uniformly without partially obstructing the flow of working gas, improving refrigeration performance Let
[0031]
4B is a BB cross section of FIG. 4A, and FIG. 4C is an enlarged view of the main part. The heat dissipating heat exchanger 27 is an annular type heat exchanger as shown in FIGS. 2 and 4, and this heat dissipating heat exchanger 27 includes a high temperature side heat exchanging housing (annular heat exchanging housing) 44 and its heat exchanger. And a heat exchanger body 45 concentrically inserted therein. The high temperature side heat exchange housing 44 is made of ordinary cast iron or the like.
[0032]
A flow path 46 for a heat exchange medium such as cooling water is formed between the high temperature side heat exchange housing 44 and the heat exchanger main body 45, and upper and lower ends are sealed with a seal 47. An inflow port 48 and an outflow port 49 are formed so as to communicate with the flow path 46.
[0033]
A large number of radiating fins 50 are formed on the outer peripheral wall of the heat exchanger body 45 so as to face the flow path 46. The heat exchanger body 45 is cast by the lost wax method using SUS, copper, aluminum, or other materials. The heat dissipating fins 50 formed on the outer surface of the heat exchanger main body 45 are precisely cast in a bowl shape, so that the heat dissipating performance is extremely excellent.
[0034]
A heat exchanger inner cylinder 45 ′ is press-fitted into the inner peripheral surface of the heat exchanger main body 45, and is integrally formed as if it forms a part of the heat exchanger main body 45. The heat exchanger inner cylinder 45 ′ is a cylindrical part formed of a material such as copper or aluminum separately from the heat exchanger main body 45. As described above, the outer surface of the heat exchanger inner tube 45 ′ is smoothly formed so as to be press-fit into the inner peripheral surface of the front end side of the heat exchanger main body 45. A large number of narrow grooves 51 are formed at intervals in the circumferential direction.
[0035]
The narrow groove 51, wire cutting, those formed by machining of the broaching etc., the pitch _{p 2} shown in FIG. 4 (d) is about 1-1.5 mm, depth _{d 2} is 1.5 About 3 mm. The wall thickness t ₂ of the heat exchanger inner tube 45 ′ itself is about 5 to 6 mm, and the pitch is narrower than that of the radiating fins 50.
[0036]
The inner surface of the heat exchanger inner cylinder 45 ′ is assembled so as to be in close contact with the outer surface of the inner cylinder 31, and a flow path for working gas such as helium is formed by the narrow groove 51 and the outer surface of the inner cylinder 31.
[0037]
As shown in FIG. 1, the heat exchanger 27 for heat dissipation is connected to a radiator (radiator) 53 via a cooling water circulation line 52 and a cooling water pump P1, and circulates cooling water. The cooling water heated and exchanged by the heat dissipation heat exchanger 27 is cooled by the cooling fan 54 of the radiator 53. A reservoir tank 56 is connected to the cooling water circulation conduit 52 via a reservoir valve 55. The radiator 53 is connected with an air vent 57 and a drain valve 58.
[0038]
Next, the operation of the Stirling refrigerator of the above embodiment of the present invention will be described. The crankshaft 7 is rotated in the forward direction by the motor 6, and the crank portions 10 and 11 in the crank chamber 5 are rotated 90 degrees out of phase. The cross guide heads 9 and 18 reciprocate through connecting rods 8 and 8 ′ that are rotatably connected to the crank portions 10 and 11, respectively. The compression piston 15 and the expansion piston 21 connected to the cross guide heads 9 and 18 via the compression piston rod 17 and the expansion piston rod 23 reciprocate with a phase difference of 90 degrees.
[0039]
While the expansion piston 21 moves 90 degrees ahead and slowly moves near the top dead center, the compression piston 15 rapidly moves near the middle toward the top dead center to perform the compression operation of the working gas. The compressed working gas flows through the communication hole 30 and the manifold 26 into a narrow groove 51 formed by machining on the inner peripheral surface of the heat exchanger inner cylinder 45 ′ of the heat exchanger 27 for heat radiation. The working gas radiated to the cooling water in the heat-dissipating heat exchanger 27 is cooled by the regenerator 28 and passes through the narrow groove 39 formed in the top heat-exchange housing inner cylinder 32 ′ of the cooling heat exchanger 29. It flows into the low greenhouse 22 (expansion space).
[0040]
When the compression piston 15 is slowly moving near the top dead center, the expansion piston 21 is suddenly moved toward the bottom dead center, and the working gas flowing into the low temperature chamber 22 (expansion space) is rapidly expanded to generate cold. To do. As a result, the cold head 40 is cooled to a low temperature.
[0041]
Then, in the cold head 40, the cold refrigerant in contact with the cooling fins 38 is cooled. When the expansion piston 21 moves from the bottom dead center to the top dead center, the compression piston 15 moves from the intermediate position toward the bottom dead center, and the working gas passes from the low temperature chamber 22 through the narrow groove 39 of the cold head 40 to the regenerator 28. The refrigerating device 28 stores the cold heat that flows into the working gas. The cold energy stored in the regenerator 28 is reused to cool again the working gas sent from the high temperature chamber 16 through the heat dissipation heat exchanger 27 as described above.
[0042]
And the cold-heat refrigerant | coolant cooled in the cold head 40 cools various cold-heat utilization apparatuses. For example, the cold heat refrigerant is sent to a cold heat refrigerant pipe in a cold energy utilization device such as a freezer, and performs freezing or cooling action in the cold heat utilization device. It is circulated back to the cold head 40 and cooled again.
[0043]
The cooling water heat-exchanged by the heat radiating heat exchanger 27 flows from the cooling water circulation pipe 52 to the heat radiating device, where it is cooled by the cooling fan and circulated again to the heat radiating heat exchanger 27.
[0044]
As mentioned above, although the Example of this invention was described, it is as follows when the characteristic of this invention is arranged here. In order to make the structure of the heat exchanger for cooling and the heat exchanger for heat radiation as simple as possible, the heat exchange for constituting the heat exchanger for heat radiation in the top heat exchange housing constituting the heat exchanger for cooling is provided. The main body is press-fitted, and fins for heat exchange are formed on the outer peripheral surface, and narrow grooves through which the working fluid passes are formed on the inner peripheral surface.
[0045]
By the way, the fins can be formed relatively accurately with the top heat exchange housing and the heat exchanger main body by lost wax casting, etc., but the narrow grooves for the working fluid leave the casting residue, burrs, etc. in the lost wax casting. This hinders the flow of the heat exchanger, generates a non-uniform flow, and deteriorates the performance and reliability of the heat exchanger.
[0046]
Therefore, in the present invention, the fin is integrally formed with the top heat exchange housing and the heat exchanger main body by lost wax casting or the like, but the narrow groove for the working fluid is formed with the top heat exchange housing inner cylinder and the heat exchanger. A narrow groove is formed on the inner peripheral surface of the inner tube of the exchanger, and is formed by press-fitting into the top heat exchange housing and the heat exchanger body. As a result, even narrow narrow grooves are precisely machined without leaving debris, burrs, etc. in the grooves, and the problem of partial obstruction of the flow of working gas is eliminated. As a result, the heat exchange performance and reliability of the cooling heat exchanger are improved.
[0047]
The embodiments of the present invention have been described based on the examples. However, the present invention is not limited to the above-described examples, and various examples can be made within the scope of the technical matters described in the claims. Needless to say.
[0048]
【The invention's effect】
According to the Stirling cooling device of the present invention, the following effects can be obtained.
(1) The top heat exchange housing constituting the expansion cylinder block is cast with lost wax or the like so that the cooling refrigerant cooling fins are integrally formed on the outer peripheral surface of the side wall, and the inner periphery of the side wall The top heat exchange housing inner cylinder with a narrow groove formed on the surface is press-fitted into a single unit, which simplifies the structure of the Stirling refrigerator itself, and the fins have a uniform thickness and precision. In addition, even narrow narrow grooves are precisely machined without leaving debris, burrs, etc. in the grooves, eliminating the partial obstruction of the working gas flow. As a result, the heat exchange performance and reliability of the cooling heat exchanger are improved.
[0049]
(2) The heat exchanger main body constituting the heat radiating heat exchanger is also cast with lost wax or the like so that fins that come into contact with the cooling water for heat radiation are integrally formed on the outer peripheral surface, and the inner peripheral surface thereof. The inner tube of the heat exchanger with a narrow groove formed by machining is press-fitted into a single unit, which simplifies the structure of the Stirling refrigerator itself, and the fins have a uniform thickness and are precisely formed. In addition, even narrow narrow grooves are precisely machined without leaving debris, burrs or the like in the grooves, and the problem of partial obstruction of the working gas flow is eliminated. As a result, the heat exchange performance and reliability of the heat exchanger for heat dissipation are improved.
[Brief description of the drawings]
FIG. 1 is an overall view illustrating a Stirling refrigerator that is an application example of a cylinder block for a heat engine according to the present invention.
FIG. 2 is a cross-sectional view illustrating an expansion cylinder block as an embodiment of a heat engine cylinder block according to the present invention.
3 is a cross-sectional view and a plan view for explaining a low temperature side heat exchange housing (top heat exchange housing) of the expansion cylinder block of FIG. 2. FIG.
4 is a cross-sectional view and a plan view for explaining a high temperature side heat exchange housing (annular heat exchange housing) of the expansion cylinder block of FIG. 2; FIG.
FIG. 5 is a diagram illustrating an example of a conventional heat exchanger.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stirling refrigerator 2 Housing 6 Motor 14 Compression cylinder block 15 Compression piston 20 Expansion cylinder block 21 Expansion piston 27 Radiation heat exchanger 28 Regenerator 29 Cooling heat exchanger 32 Low temperature side heat exchange housing (top heat exchange housing)
32 'top heat exchange housing inner cylinder 36 side wall 38 of top heat exchange housing cooling fin 38' intermediate flange 39, 51 narrow groove 41 annular recess 44 for regenerator high temperature side heat exchange housing (annular heat exchange housing)
45 Heat Exchanger Body 45 'Heat Exchanger Inner Tube 50 Heat Dissipation Fin 53 Heat Dissipator

Claims (5)

A cylinder block having a cylindrical top heat exchange housing having a top wall and a side wall, and an inner cylinder disposed in the top heat exchange housing and on which a piston or a displacer of the heat engine slides.
On the tip side of the top heat exchange housing, a top heat exchange housing inner cylinder is press-fitted and provided,
On the inner peripheral surface of the inner cylinder of the top heat exchange housing, axially narrow grooves that form a flow path for working gas together with the outer peripheral surface of the inner cylinder are formed by machining,
A cylinder block for a heat engine, wherein an inner peripheral surface on a proximal end side of the top heat exchange housing forms an annular flow path for a working gas regenerator together with an outer peripheral surface of the inner cylinder. A cylinder block having an inner cylinder on which a piston or displacer of a heat engine slides,
A heat exchanger composed of a cylindrical annular heat exchange housing and a heat exchanger main body inserted and fixed therein is disposed outside the inner cylinder.
A heat exchange fin is formed on the outer peripheral surface of the heat exchanger body, and a heat exchanger inner cylinder is press-fitted inside the heat exchanger body.
On the inner peripheral surface of the inner tube of the heat exchanger, axially narrow grooves that form a flow path for working gas together with the outer peripheral surface of the inner cylinder are formed by machining,
A space between the annular heat exchange housing and the heat exchanger main body serves as a refrigerant passage, and a refrigerant inlet and a refrigerant outlet are formed in the annular heat exchange housing so that the refrigerant passage communicates. Cylinder block for heat engine. A cylinder block having a cylindrical top heat exchange housing having a top wall and a side wall, and an inner cylinder disposed in the top heat exchange housing and on which a piston or a displacer of the heat engine slides.
On the tip side of the top heat exchange housing, a top heat exchange housing inner cylinder is press-fitted and provided,
On the inner peripheral surface of the inner cylinder of the top heat exchange housing, axially narrow grooves that form a flow path for working gas together with the outer peripheral surface of the inner cylinder are formed by machining,
The inner peripheral surface of the base end side of the top heat exchange housing forms an annular flow path for a working gas regenerator together with the outer peripheral surface of the inner cylinder,
A heat exchanger composed of a cylindrical annular heat exchange housing and a heat exchanger main body inserted and fixed therein is disposed outside the inner cylinder.
A heat exchange fin is formed on the outer peripheral surface of the heat exchanger body, and a heat exchanger inner cylinder is press-fitted inside the heat exchanger body.
On the inner peripheral surface of the inner tube of the heat exchanger, axially narrow grooves that form a flow path for working gas together with the outer peripheral surface of the inner cylinder are formed by machining,
A space between the annular heat exchange housing and the heat exchanger main body serves as a refrigerant passage, and a refrigerant inlet and a refrigerant outlet are formed in the annular heat exchange housing so that the refrigerant passage communicates. Cylinder block for heat engine. The top heat exchange housing has a fin formed by lost wax casting or cast iron integrally with the top heat exchange housing, or a fin that is formed separately and retrofitted on the outer peripheral surface of the top heat exchange housing. A cylinder block for a heat engine according to claim 1 or 3. 5. The cylinder block for a heat engine according to claim 1, 2, 3 or 4, wherein the heat engine is a Stirling cycle apparatus, a Virmier cycle apparatus, or a Kuak-Yarborov cycle apparatus.

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