JP2002098431A - Cylinder block for heat engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability at low cost, and refine working accuracy for improvements of heat exchange performance and reliability by constructing each section, by making use of the casting of lost wax and machining with respect to the heat exchanger of a Stirling freezer. SOLUTION: An outer peripheral surface of a high temperature side heat exchanger body 45 in a low-temperature side heat exchange housing 32 and a high-temperature side heat exchange housing, and fins 38, 50 are formed integrally with lost wax and casting, such that the fins 38, 50 are provided on the outer peripheral surface of the high temperature side heat exchanger body. On the inside of the high-temperature side heat exchanger body an inside cylinder, a low-temperature side heat exchange housing inner cylinder 32', and a high-temperature side heat exchange inner cylinder 45' are forced into the inside of the body for integration thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field 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 Vilmier cycle device or a Kuku-Yaborov cycle device.

[0002]

2. Description of the Related Art In recent years, as a refrigeration system that substitutes CFCs for global environmental problems, the operating temperature of the refrigeration system is wider than that of conventional refrigeration systems. Including
Low-temperature liquid circulators, low-temperature thermostats, constant-temperature baths, heat shock test equipment, freeze dryers, temperature characteristic test equipment, blood / cell storage devices, cold coolers, and various other types of cold heat equipment such as cooling equipment The Stirling refrigerator has been spotlighted as a refrigerator that is applicable, compact, has a high coefficient of performance, and has good energy efficiency.

In a Stirling refrigerator, a working gas flows between a compression chamber (high-temperature chamber) and an expansion chamber (low-temperature chamber), and a heat-absorbing heat exchanger (low-temperature chamber) disposed along this flow path. Side heat exchanger) and heat exchanger for heat dissipation (high temperature side heat exchanger)
As a result, heat exchange with the cold refrigerant and the heat radiation refrigerant is performed, respectively. Conventionally, as a heat exchanger, for example, there is a shell-and-tube heat exchanger, a plate-fin heat exchanger, or the like.

[0004] The heat exchanger in the Stirling refrigerator is
In order to improve the heat exchange performance and reliability, a flow path that flows uniformly without partially obstructing the flow of the working gas, a precisely formed fin with a uniform thickness, etc. are required. Further, in order to realize a low cost, a configuration is required in which the heat exchanger itself is excellent in workability and simplifies the entire structure of the Stirling refrigerator.

[0005] The shell and tube type heat exchanger has a problem in that it takes time and effort to assemble it, and there is a problem in reducing the cost. The plate fin type heat exchanger also has a problem in cost. As a 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 on the outer peripheral surface and the inner peripheral surface by lost wax casting. A cylinder block for a heat engine has been proposed (see Japanese Patent Application No. 10-365364).

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 part of a heat-dissipating heat exchanger (high-temperature side heat exchanger) as an example. 5A and 5B are a cross-sectional view of the heat exchanger for heat radiation and a CC cross-sectional view thereof, and FIG. 5C is an enlarged view of a main part. The heat-radiating heat exchanger 27 is an annular-type heat exchanger. The heat-exchanging body 45 is mounted in the high-temperature-side heat exchanging housing 44 via a seal 47, and the inner cylinder 31 is further adhered thereto. Assembled.

A fin 50 and a narrow groove 51 for working fluid are integrally formed on the outer peripheral surface and the inner peripheral surface of the heat exchanger body 45 by lost wax casting. A heat exchange medium such as cooling water flows into the flow channel 46 from the inlet 48 and flows out of the outlet 4.
Flow out of 9. 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]

The radiating heat exchanger has a structure in which the fins and the narrow grooves are integrally formed in the heat exchanger body by lost wax casting, so that the entire structure of the heat exchanger is simple. Becomes By the way, fins can be formed relatively accurately by lost wax casting, but the narrow groove for working fluid, if the width of the narrow groove is reduced in order to improve heat transfer performance, in lost wax casting, casting residue Burrs and the like remain, and it is necessary to perform work for removing scum and burrs after casting, which is not sufficient in terms of improvement of workability in this aspect.

SUMMARY OF THE INVENTION The object of the present invention is to solve the improvement of the prior invention which is caused when the width of the narrow groove is reduced in this way, and includes an integral part including a fin on the outer peripheral surface by lost wax casting. The heat exchanger on the high-temperature side and the low-temperature side have a simple structure, and even a narrow groove on the inner peripheral surface can be formed precisely without leaving residue or burrs in the groove. The specific issues are to solve the problem that the gas flow is partially obstructed, improve the heat exchange performance and reliability of the cooling heat exchanger, and improve the workability and reduce the cost. I do.

[0010]

SUMMARY OF THE INVENTION 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 is disposed in the top heat exchange housing.
A cylinder block having an inner cylinder on which a piston or a displacer of a heat engine slides, wherein a top heat exchange housing inner cylinder is press-fitted and provided at a front end side of the top heat exchange housing; On the inner peripheral surface of the inner cylinder of the exchange housing, an axially linear narrow groove forming a flow path for the working gas together with the outer peripheral surface of the inner cylinder is formed by machining, and the top heat exchange housing is formed. The inner peripheral surface on the base end side of the inner cylinder forms an annular flow passage for a regenerator of the working gas together with the outer peripheral surface of the inner cylinder, thereby providing a cylinder block for a heat engine.

According to another aspect of the present invention, there is provided a cylinder block having an inner cylinder on which a piston or a displacer of a heat engine slides, wherein a cylindrical annular heat exchanger is provided outside the inner cylinder. A heat exchanger comprising a housing and a heat exchanger body inserted and fixed inside the housing is provided, and fins for heat exchange are formed on an outer peripheral surface of the heat exchanger body. A heat exchanger inner cylinder is press-fitted and provided inside the exchanger body, and a flow path for working gas is formed on an inner peripheral surface of the heat exchanger inner cylinder together with an outer peripheral surface of the inner cylinder. A narrow groove is formed in the axial direction by machining, and the space between the annular heat exchange housing and the heat exchanger body is a refrigerant passage, and the annular passage is communicated with the refrigerant passage. Heat exchange housing To provide a cylinder block for thermal engine, characterized in that medium inlet and a refrigerant outlet are formed.

In order to solve the above-mentioned problems, the present invention provides a cylindrical top heat exchange housing having a top wall and side walls, and a piston or displacer for a heat engine which is disposed in the top heat exchange housing and slides. An inner cylinder that moves, 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 circumference of the inner cylinder of the top heat exchange housing is provided. An axially linear narrow groove forming a flow path for the working gas together with the outer peripheral surface of the inner cylinder is formed on the surface by machining, and the inner peripheral surface on the base end side of the top heat exchange housing is formed. Forms an annular flow path for the regenerator of the working gas together with the outer peripheral surface of the inner cylinder, and a cylindrical annular heat exchange housing and an inner side thereof are inserted outside the inner cylinder. A heat exchanger comprising a fixed heat exchanger main body is provided, and a fin for heat exchange is formed on an outer peripheral surface of the heat exchanger main body, and inside the heat exchanger main body. The heat exchanger inner cylinder is provided by press-fitting, and the inner peripheral surface of the heat exchanger inner cylinder has an axially linear shape that forms a flow path for working gas together with the outer peripheral surface of the inner cylinder. A narrow groove is formed by machining, a space between the annular heat exchange housing and the heat exchanger body is a refrigerant passage, and a refrigerant inlet is provided in the annular heat exchange housing so that the refrigerant passage communicates with the refrigerant passage. And a cylinder block for a heat engine, wherein a refrigerant outlet is formed.

The top heat exchange housing has a fin formed on the outer peripheral surface on a distal end side thereof integrally formed with the top heat exchange housing by lost wax casting or cast iron, or a fin formed separately and attached later. Is also good.

As a heat engine to which the cylinder block of the present invention can be applied, there are a Stirling cycle device, a Vilmier cycle device, a Kuku-Yarlov cycle device, and the like.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on embodiments with reference to the drawings. FIGS. 1 to 5 are diagrams illustrating an embodiment of a cylinder block for a heat engine according to the present invention. FIG. 1 is a Stirling example of a heat engine to which the cylinder block for a heat engine according to the present invention is applied. FIG. 1 is an overall view illustrating a refrigerator 1. Stirling refrigerator 1
Is formed of a casting, and the inside thereof is held in a semi-sealed state. The interior of the housing 2 is partitioned into a motor chamber 4 and a crank chamber 5 by a partition wall 3.

The motor chamber 4 is provided with a forward / reverse rotatable motor 6, and the crank chamber 5 has a crankshaft 7 for converting the rotation of the motor 6 into reciprocating motion, a connecting rod 8, A cross guide head 9 is provided and functions as a driving unit of the Stirling refrigerator 1.

Two crank parts 1 of the crankshaft 7
0 and 11 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.

At the top of the crankcase 5, a compression cylinder 1
2 and an expansion cylinder 13 extending slightly above the compression cylinder 12. Compression cylinder 12
The working gas, for example, helium, hydrogen, nitrogen, or the like is sealed in the expansion cylinder 13 and the housing 2. The compression cylinder 12 has a compression cylinder block 14 fixed to the housing 2 by bolts or the like. 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 therein is compressed to become high temperature.

The compression piston rod 17 connects the compression piston 15 and the cross guide head 9, and the compression cylinder 1
2 and a crank chamber 5 extend through an oil seal 19. Since the sliding direction of the reciprocating compression piston 15 is reversed 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 change amount of the volume per unit time is also small. It is small and has the maximum 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 the compression piston 15 per unit time is also maximum. Becomes

On the other hand, the expansion cylinder 13 is
Cylinder block 2 fixed to bolts and the like
The expansion piston 21 reciprocates in the space of the expansion cylinder block 20, and the upper part (expansion space) of the space is a low-temperature chamber 22, in which the working gas 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 is
It moves ahead 90 degrees more.

The expansion cylinder block 20 is provided with a manifold 26 through which a working gas flows into and out of the compression space of the compression cylinder 12. The manifold 26 further includes a heat-radiating heat exchanger (high-temperature-side heat exchanger) 27. A regenerator 28 and a heat exchanger for cooling (low-temperature side heat exchanger) 29 are annularly arranged so as to sequentially communicate with each other.

In the vicinity of the upper end of the compression cylinder block 14, a communication hole 3 for communicating the high temperature chamber 16 and the manifold 26 is provided.
0 is formed, whereby the high-temperature chamber 16 and the low-temperature chamber 22 sequentially communicate with each other via the communication hole 30, the manifold 26, the heat exchanger 27 for heat radiation, the regenerator 28, and the heat exchanger 29 for cooling. It is configured as follows.

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.
And a heat-radiating heat exchanger 27 and a low-temperature-side heat exchange housing (top heat exchange housing) 32 disposed concentrically outside the lower part of the inner cylinder 31. The inner cylinder 31 forms a cylinder space in which the expansion piston 21 reciprocates, and the upper cylinder 33 and the lower cylinder 34 may be combined via the O-ring 24 or may be manufactured integrally.

FIG. 3A shows a low-temperature side heat exchange housing 32.
3B is a cross-sectional view taken along the line AA in 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. Fins 38 and intermediate flanges 38 'are formed on the outer peripheral surface of the side wall 36 at the distal end side (upper side in the figure). The top wall 35 includes a flange top wall 35 ′ and a central top wall 3.
5 ", and the central top wall portion 35"
As shown by, it is welded and integrated with the inner surface of the top end of the side wall 36. Further, the top wall 35 may be formed integrally with the side wall 36 by lost wax casting, machining, or the like described later.

A top heat exchange housing inner cylinder 32 ′ is press-fitted to the inner peripheral surface on the distal end side of the side wall 36, and is integrally formed as if forming a part of the side wall 36. The top heat exchange housing inner cylinder 32 ′ is a cylindrical component formed of a material such as copper or aluminum separately from the side wall 36. As described above, the outer surface of the top heat exchange housing inner cylinder 32 ′ is formed smoothly so as to be able to be press-fitted into the inner peripheral surface on the distal end side of the side wall 36. A large number of grooves 39 are formed at intervals in the circumferential direction.

The narrow groove 39 is formed by machining such as wire cutting and broaching.
Pitch _{p 1} shown in is about 1-1.5 mm, depth d
₁ is about 1.5 to 3 mm. Then, the thickness t ₁ of the top heat exchange housing tube 32 'itself is about 5 to 6 mm, has a narrow pitch than the fin 38.

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 narrow groove 39 and the outer surface of the inner cylinder 31 form a flow path for working gas. Thus, the top part (cold head 40) of the low-temperature side heat exchange housing 32 forms the cooling heat exchanger (low-temperature side heat exchanger) 29. The cold head 40 is in contact with air, water, alcohol, or other cold refrigerant to cool the cold refrigerant.

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 of the top heat exchange housing inner cylinder 32 'and the inner cylinder 31. A regenerator material such as a metal mesh is filled to form a regenerator 28. The flange 37 at the lower end of the low-temperature side heat exchange housing 32 is mounted on the flange 43 at the upper end of the heat exchanger 27 for heat radiation.

The low-temperature side heat exchange housing 32 of the present invention comprises:
Except for the top heat exchange housing inner cylinder 32 ', it is cast by a lost wax method or the like using a material such as SUS.
That is, in the low-temperature side heat exchange housing 32 of the present invention, the cooling fin 38 is formed on the outer peripheral surface and the narrow groove 39 for the flow path of the working gas is formed on the inner peripheral surface. The tube 32 'is press-fitted.

The low-temperature side heat exchange housing 32 manufactured by the lost wax casting as described above has extremely excellent heat radiation performance because the cooling fins 38 formed on the outer surface thereof are precisely cast in a fine fold. The axial narrow groove 39 formed on the inner surface can be finely formed by machining without leaving burrs, and can flow uniformly without partially obstructing the flow of the working gas. Improve performance.

FIG. 4B is a sectional view taken along the line BB of FIG. 4A, and FIG. 4C is an enlarged view of a main part. The heat-radiating heat exchanger 27 is an annular-type heat exchanger as shown in FIGS. 2 and 4. The heat-radiating heat exchanger 27 includes a high-temperature-side heat exchange housing (annular heat exchange housing) 44 and a heat-exchange housing 44. 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.

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 body 45, and upper and lower ends are sealed with seals 47. An inflow port 48 and an outflow port 49 are formed so as to communicate with the flow path 46.

A large number of radiating fins 50 are formed on the outer peripheral wall of the heat exchanger body 45 facing the flow path 46. The heat exchanger body 45 is cast from SUS, copper, aluminum, or another material by a lost wax method. Radiation fins 5 formed on the outer surface of heat exchanger body 45
0 is extremely excellent in heat radiation performance because it is precisely cast in a pleated shape.

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 forming a part of the heat exchanger main body 45. The heat exchanger inner tube 45 ′ is a cylindrical component formed of a material such as copper or aluminum separately from the heat exchanger main body 45. The outer surface of the heat exchanger inner tube 45 'is connected to the heat exchanger body 45 as described above.
Is formed so as to be able to be press-fitted into the inner peripheral surface on the front end side, and a large number of narrow grooves 51 in the longitudinal direction are formed on the inner peripheral surface at intervals in the circumferential direction.

The narrow grooves 51 are formed by machining such as wire cutting and broaching.
Pitch _{p 2} shown in is about 1-1.5 mm, depth d
₂ is about 1.5 to 3 mm. The heat exchanger inner tube 45 'the thickness _{t 2} of itself is about 5 to 6 mm, it has a narrow pitch from the heat radiating fins 50.

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 has a narrow groove 51.
And the outer surface of the inner cylinder 31 form a flow path for a working gas such as helium.

As shown in FIG. 1, the heat radiating heat exchanger 27 is connected to a radiator (radiator) 53 via a cooling water circulation pipe 52 and a cooling water pump P1 to circulate the cooling water. . The cooling water heated and exchanged by the heat exchanger 27 is cooled by the cooling fan 54 of the radiator 53.
The cooling water circulation line 52 is connected via a reservoir valve 55 to
The reservoir tank 56 is connected. Also, the radiator 53
Is connected to an air vent 57 and a drain valve 58.

Next, the operation of the Stirling refrigerator of the above embodiment of the present invention will be described. The motor 6 rotates the crankshaft 7 in the forward direction, and the crank portions 10 and 11 in the crank chamber 5 rotate with a phase shift of 90 degrees. The cross guide heads 9 and 18 reciprocate via connecting rods 8 and 8 'rotatably connected to the crank portions 10 and 11. 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 from each other.

While the expansion piston 21 moves slowly near the top dead center 90 degrees ahead of it, the compression piston 15 moves rapidly toward the top dead center near the middle to compress the working gas. The compressed working gas passes through the communication hole 30 and the manifold 26 and flows into the narrow groove 51 formed by machining on the inner peripheral surface of the heat exchanger inner tube 45 ′ of the heat radiation heat exchanger 27. The working gas that has radiated heat to the cooling water in the heat radiating heat exchanger 27 is cooled by the regenerator 28, and 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 temperature chamber 22 (expansion space) through the inside.

When the compression piston 15 is slowly moving near the top dead center, the expansion piston 21 moves rapidly toward the bottom dead center, and the working gas flowing into the low temperature chamber 22 (expansion space) expands rapidly. Cold heat is generated. Thereby, the cold head 40 is cooled to a low temperature.

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 to the bottom dead center, and the working gas flows from the low temperature chamber 22 through the narrow groove 39 of the cold head 40 to the regenerator 28. Regenerator 2
Store heat in 8. The cold stored in the regenerator 28 is reused to cool the working gas sent from the high-temperature chamber 16 through the heat-radiating heat exchanger 27 again as described above.

Then, the cold refrigerant cooled in the cold head 40 cools various cold utilization devices. For example, the cold refrigerant is sent to a cold refrigerant pipe in a cold utilization device such as a freezer, and performs freezing or cooling in the cold utilization device. It is circulated back to the cold head 40 and cooled again.

The cooling water that has been heat-exchanged in the heat-radiating heat exchanger 27 flows from the cooling-water circulation pipe 52 to the radiator, where it is cooled by the cooling fan and circulated to the heat-radiating heat exchanger 27 again.

The embodiments of the present invention have been described above. Here, the features of the present invention will be summarized as follows.
In order to make the structure of the cooling heat exchanger and the heat radiating heat exchanger as simple as possible, the present invention relates to a heat exchanging device comprising a heat exchanging heat exchanger in a top heat exchanging housing constituting a cooling heat exchanger. The main body is press-fitted, 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.

By the way, the fins can be formed relatively accurately by the lost heat casting and the top heat exchange housing and the heat exchanger body, but the fine grooves for the working fluid remain in the lost wax casting due to the residue of the castings and burrs. As a result, the flow of the working fluid is obstructed, causing a non-uniform flow, which impairs the performance and reliability of the heat exchanger.

Therefore, in the present invention, the fins are
The top heat exchange housing and the heat exchanger body are integrally formed by lost wax casting, etc., and the narrow grooves for the working fluid are formed on the inner peripheral surfaces of the top heat exchange housing inner cylinder and the heat exchanger inner cylinder, respectively. A narrow groove is formed and press-fitted into the top heat exchange housing and the heat exchanger body, respectively. Thereby, even a narrow groove having a small width is machined precisely without leaving residue or burrs in the groove, and the flow of the working gas is partially prevented from being obstructed. As a result, the heat exchange performance and reliability of the cooling heat exchanger are improved.

Although the embodiments of the present invention have been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications may be made within the scope of the technical matters described in the claims. It goes without saying that there are embodiments.

[0048]

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 fins for cooling the cooling medium are integrally formed on the outer peripheral surface of the side wall, and the inner periphery of the side wall is formed. The internal structure of the Stirling refrigerator itself is simplified by press-fitting the inner cylinder of the top heat exchange housing with a narrow groove formed by machining on the surface, and the fins have a uniform thickness and precision. Even a narrow groove having a small width is precisely machined without leaving residue, burrs and the like in the groove, and the flow of the working gas is partially prevented from being obstructed. As a result, the heat exchange performance and reliability of the cooling heat exchanger are improved.

(2) The heat exchanger body constituting the heat radiation heat exchanger is cast with lost wax or the like so that fins for contacting the cooling water for heat radiation are integrally formed on the outer peripheral surface thereof. By press-fitting the inner cylinder of the heat exchanger with a narrow groove formed by machining on the inner peripheral surface, the structure of the Stirling refrigerator itself is simplified and the fins have a uniform thickness. Even a narrow groove that is formed precisely and is precisely machined without leaving scum and burrs in the groove, the flow of the working gas is partially prevented from being obstructed. As a result, the heat exchange performance of the heat exchanger for heat dissipation,
Reliability is improved.

[Brief description of the drawings]

FIG. 1 is an overall view illustrating a Stirling refrigerator as an application example of a cylinder block for a heat engine according to the present invention.

FIG. 2 is a diagram illustrating an expansion cylinder block as an embodiment of the cylinder block for a heat engine according to the present invention;
It is sectional drawing.

3 is a cross-sectional view and a plan view illustrating 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 illustrating a high-temperature side heat exchange housing (annular heat exchange housing) of the expansion cylinder block of FIG. 2;

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 Heat dissipation 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 of top heat exchange housing 38 Cooling fin 38' Intermediate flange 39, 51 Narrow groove 41 Annular recess for regenerator 44 High temperature side heat exchange housing (annular heat exchange housing) 45 Heat exchanger body 45 'heat exchanger inner tube 50 radiator fin 53 radiator

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F25B 9/00 F25B 9/00 J

Claims (5)

[Claims] 1. 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 in 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 top end side of the top heat exchange housing, and an inner peripheral surface of the top heat exchange housing inner cylinder operates together with an outer peripheral surface of the inner cylinder. An axially straight narrow groove forming a gas flow path is formed by machining, and the inner peripheral surface on the base end side of the top heat exchange housing is formed along with the outer peripheral surface of the inner cylinder for working gas. A cylinder block for a heat engine, comprising an annular flow path for a regenerator. 2. A cylinder block having an inner cylinder on which a piston or a displacer of a heat engine slides, wherein a cylindrical annular heat exchange housing and a heat exchanger inserted and fixed inside the housing are provided outside the inner cylinder. A heat exchanger comprising: a heat exchanger; and a heat exchange fin formed on an outer peripheral surface of the heat exchanger body, and a heat exchanger inside the heat exchanger body. A cylinder is press-fitted, and an axially linear narrow groove forming a flow path for working gas together with the outer peripheral surface of the inner cylinder is machined 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 a refrigerant passage, so that the refrigerant passage communicates,
A cylinder block for a heat engine, wherein a coolant inlet and a coolant outlet are formed in the annular heat exchange housing. 3. A cylinder block having a cylindrical top heat exchange housing having a top wall and side walls, and an inner cylinder disposed within the top heat exchange housing and on which a piston or displacer of a heat engine slides. A top heat exchange housing inner cylinder is press-fitted and provided on the distal end side of the top heat exchange housing inner cylinder. An outer peripheral surface of the inner cylinder is provided on an inner peripheral surface of the top heat exchange housing inner cylinder. In addition, an axially linear narrow groove forming a flow path for working gas is formed by machining, and the inner peripheral surface on the base end side of the top heat exchange housing operates together with the outer peripheral surface of the inner cylinder. An annular flow path for a gas regenerator is formed. Outside the inner cylinder, a heat exchanger comprising a cylindrical annular heat exchange housing and a heat exchanger main body inserted and fixed inside the housing. 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 and provided inside the heat exchanger body. On the inner peripheral surface of the heat exchanger inner cylinder, an axially linear narrow groove forming a flow path for working gas together with the outer peripheral surface of the inner cylinder is formed by machining. The space between the annular heat exchange housing and the heat exchanger body is a refrigerant passage, so that the refrigerant passage communicates.
A cylinder block for a heat engine, wherein a coolant inlet and a coolant outlet are formed in the annular heat exchange housing. 4. The top heat exchange housing has, on its outer peripheral surface on the distal end side, a fin molded integrally with the top heat exchange housing by lost wax casting or cast iron, or a fin formed separately and attached later. The cylinder block for a heat engine according to claim 1 or 3, wherein: 5. The heat engine according to claim 1, wherein the heat engine is a Stirling cycle device, a Virmier cycle device or a Kuku-Javlov cycle device.
Or a cylinder block for a heat engine according to 4.