JPH11223399A - Heat exchanger for heat engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a heat exchanger, and to improve heat exchange performance sealing an offset strip fin onto the inner surface of a heat exchange cylinder so that the offset strip fin faces the inside of a channel for an operation gas. SOLUTION: A heat exchanger is provided with an outer sleeve 41 and a cylindrical heat exchange cylinder 42 being inserted into the outer sleeve 41, sets a space being formed by an inner cylinder or a displacer cylinder 53 being arranged inside the heat exchange cylinder 42 to a channel 54 for the operation gas of a heat engine such as a helium gas, and provides an offset strip fin 35 so that the offset strip fin faces the operation gas channel 54. More specifically, the offset strip fin 35 is brazed along the inner surface of the heat exchanger cylinder 42 so that the longitudinal direction of a continuous-length- shaped batten is set to the circumferential direction of the heat exchange cylinder 42, thus easily manufacturing a heat exchanger and improving heat exchange performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger mounted on a heat engine such as a Stirling cycle device (a Stirling engine, a Stirling refrigerating machine, etc.), a Vilmier cycle device, and a Kuku-Jarborov cycle device.

[0002]

2. Description of the Related Art Conventionally, heat engines such as Stirling cycle devices (such as Stirling engines and Stirling refrigerating machines), Vilmier cycle devices, and Kuku-Yaborov cycle devices have been disclosed in JP-A-7-293334 and JP-A-9-933. These are known from, for example, JP-A-151792 and JP-A-8-158939.

[0003] In Fig. 1, reference numeral 1 denotes a Vilmier cycle engine, which is an example of a heat engine, in which a high temperature side displacer 2 and a low temperature side displacer 3 are connected to piston rods 4 and 5 arranged at right angles to each other. The working cylinders are connected to each other and sealed with a working gas such as helium, and reciprocate in the high-temperature side cylinder 6 and the low-temperature side cylinder 7 sealed by the gas rod seals 4 ′ and 5 ′. A high-temperature chamber (compression chamber) 8 of the high-temperature cylinder 6 is connected to a heater 9 composed of a multi-tube tube.

[0004] The tip 9 'of the heater 9 and the high temperature side cylinder 6
A high temperature side regenerator 11 and a medium temperature side heat exchanger 12 are interposed between a medium temperature chamber (expansion chamber) 10 and a low temperature chamber (compression chamber) 13 of the low temperature cylinder 7 and a medium temperature chamber (expansion chamber). 14
, A low-temperature side heat exchanger 15, a low-temperature side regenerator 16, and a medium-temperature side heat exchanger 12 similar to the above are interposed. The connecting duct 17 is connected to the medium temperature chamber 10 of the high temperature side cylinder 6.
And the medium temperature chamber 14 of the low temperature side cylinder 7.

[0005] Cross guides 18 and 19 are fixed to the piston rods 4 and 5, respectively.
And 19 are connected to a crank mechanism 20. The crank mechanism 20 is rotated by the power of an electric motor or the like (not shown) at the time of start, and is rotated by the power of the Vilmier cycle engine 1 itself after the start. Thereby, the high temperature side displacer 2 and the low temperature side displacer 3 reciprocate. A heating means 21 such as a gas burner is provided above the high temperature side displacer 2.

When the high-temperature displacer 2 and the low-temperature displacer 3 which are displaced by about 90 degrees by the rotation of the crank mechanism 20 reciprocate, the working gas in the high-temperature chamber 8 of the high-temperature cylinder 6 is pushed out and the high-temperature regenerator 11. It is led to the intermediate temperature side heat exchanger 12. Similarly, the working gas in the low-temperature chamber 13 of the low-temperature cylinder 7 is pushed out and flows through the working gas flow paths of the low-temperature heat exchanger 15, the low-temperature regenerator 16, and the medium-temperature heat exchanger 12.

Conventionally, as a heat exchanger applied to the heat exchangers 12 and 15 of the Vilmier cycle engine 1 and the like, a shell and tube type heat exchanger 22 as shown in FIGS. 2 and 3 is conventionally used. is there.

In the shell and tube type heat exchanger 22 shown in FIGS. 2 and 3, an annular flow path 25 through which a heat exchange medium such as cooling water flows is formed between an inner sleeve 23 and an outer sleeve 24. A large number of tubes 26 through which a working gas of a heat engine such as helium flows in the flow path 25 are fixed via a shell 27. However,
Although the shell-and-tube heat exchanger 22 is excellent in performance, it takes time and effort to manufacture and is expensive.

FIG. 4 shows an example of a heat exchanger applied to the heat exchangers 12 and 15 of the Vilmier cycle engine 1 and the like.
And a plate-fin heat exchanger 28 shown in FIG. In the plate fin type heat exchanger 28, a flow path 31 for a heat exchange medium such as cooling water is formed between a housing 29 and a heat exchanger body 30 inserted therein, and faces the flow path 31. A large number of annular fins 32 are formed on the outer peripheral wall of the heat exchanger body 30, and minute grooves are formed on the inner peripheral wall of the heat exchanger body 30 along the axial direction on the inner periphery of the heat exchanger body. A flow path of a heat exchange fluid such as helium is formed between the heat exchanger fluid 33 and the liner 34 mounted on the inner periphery of the heat exchanger body 30. The heat exchanger 28 is excellent in manufacturing, workability, and cost, but does not have sufficient heat exchange performance for the engine.

[0010]

SUMMARY OF THE INVENTION The present invention focuses on an offset strip fin having excellent heat transfer performance and utilizes it for a heat exchanger of a heat engine. It is an object of the present invention to provide a low-cost heat exchanger which is excellent in performance, easy to manufacture and excellent in workability.

[0011]

In order to solve the above-mentioned problems, the present invention has an outer cylinder and a heat exchange tube inserted and fixed to the outer cylinder, and the heat exchange tube extends along the inner surface of the heat exchange tube. A heat exchanger for a heat engine that exchanges heat between a working gas of a heat engine flowing through a working gas flow path and a heat exchange medium flowing through a heat exchange medium flow path along an outer surface of a heat exchange cylinder. An object of the present invention is to provide a heat exchanger for a heat engine, comprising offset strip fins fixed to the inner surface of the heat exchange tube so as to face the working gas flow path.

Further, the present invention provides an outer cylinder, and a heat exchange cylinder inserted and fixed to the outer cylinder, wherein a working gas of a heat engine flowing through a working gas flow path along an inner surface of the heat exchange cylinder is provided. A heat exchanger for a heat engine that performs heat exchange with a heat exchange medium flowing through a heat exchange medium flow path along the outer surface of a heat exchange cylinder, such that the heat exchanger faces the heat exchange medium flow path. Another object of the present invention is to provide a heat exchanger for a heat engine, comprising: an offset strip fin fixed to an outer surface of the heat exchange cylinder.

Further, the present invention provides an outer cylinder and a heat exchange cylinder inserted and fixed to the outer cylinder, wherein the working gas of the heat engine flows through a working gas flow path along the inner surface of the heat exchange cylinder. A heat exchanger for a heat engine that performs heat exchange with a heat exchange medium flowing through a heat exchange medium flow path along the outer surface of the heat exchange cylinder, such that the heat exchanger faces the working gas flow path. An offset strip fin fixed to the inner surface of the heat exchange cylinder,

In order to face the heat exchange medium flow path,
An offset strip fin fixed to an outer surface of the heat exchange cylinder. An object of the present invention is to provide a heat exchanger for a heat engine.

[0015] The heat exchanger for a heat engine of the present invention is applied to a Stirling cycle device, a Vilmier cycle device, and a Kuku-Javlov cycle device.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. The point of the present invention is
In order to improve heat exchanger performance, offset strip fins are disposed on the inner surface and / or outer surface of the heat exchanger tube forming the heat exchanger body.

Referring to FIGS. 6 and 7, the structure of the offset strip fin will be described. FIG. 6 shows a heat exchanger in which offset strip fins 35 are provided between two inner and outer support plates 36 and 37, and FIG. 7 is an enlarged view of a part of the offset strip fins 35.

The offset strip fins 35 are formed by bending a long strip 38 having excellent heat transfer performance into a rectangular shape in a zigzag manner, and forming a partition 39 having a rectangular cross section. It is brazed to the support plate so as to be formed in a plurality in the longitudinal direction. A plurality of such long strips 38 are arranged continuously in a direction perpendicular to the longitudinal direction thereof, and the partition paths 39 formed by the long strips adjacent to each other are displaced from each other (in an offset state). Have been.

Such offset strip fins 3
5 is a heat exchanger 12, such as a Stirling cycle heat engine 1,
8 to 10 show a first embodiment applied to the fifteenth embodiment. The heat exchanger 40 of this embodiment includes an outer sleeve 41 and a cylindrical heat exchange tube 4 inserted into the outer sleeve 41.
2 and is fitted and attached to the outer periphery of the high-temperature side cylinder 6 and the low-temperature side cylinder 7 of the heat engine as shown in FIG. 1 with or without an inner cylinder (liner).

The heat exchange cylinder 42 is formed in a cylindrical shape having an appropriate thickness, and annular sealing portions 43 are formed at upper and lower ends of the heat exchange cylinder 42, respectively. Each of the annular sealing portions 43 includes a large-diameter portion 44 abutting on the inner surface of the outer sleeve 41 and a seal 45 formed on the outer surface of the large-diameter portion.
The upper and lower sealing portions 43, the outer surface of the heat exchange cylinder 42, and the outer sleeve 4 are formed.
An annular space surrounded by the inner surface 1 forms a heat exchange medium flow channel 47 through which a heat exchange medium such as cooling water flows. In addition, the sealing structure by the seal 45 is adopted as needed.

On the outer surface of the heat exchange cylinder 42, a plurality of annular heat exchange fins 48 are formed so as to protrude into the heat exchange medium flow path 47.

The outer sleeve 41 is located on the opposite side to the axis of the outer sleeve 41, and is provided with an inflow hole 5
1 and an outflow hole 52 are provided. The heat exchange medium flows into the heat exchange medium channel 47 from the inflow hole 51, flows in contact with the heat exchange fins 48, undergoes heat exchange in the heat exchanger 40, and flows out of the outflow hole 52.

A space formed by the heat exchange cylinder 42 and an inner cylinder or a displacer cylinder 53 disposed inside the cylinder serves as a working gas flow path 54 of a heat engine such as helium gas. An offset strip fin 35 is provided facing the working gas flow path 54.

Specifically, offset strip fins 35 are provided on the inner surface of the heat exchange cylinder 42 so that the longitudinal direction of the long strip 38 is in the circumferential direction of the heat exchange cylinder 42. Brazed along the inner surface. Thereby, the offset strip fins 3 are arranged in the longitudinal direction of the heat exchange cylinder 42.
5 so that the directions of the division passages 39 coincide with each other.
, The offset strip fins 35 are arranged on the inner surface.

The operation of the heat exchanger 40 according to the first embodiment will be described in the case where heat exchange is performed such that the working gas of the Vilmier cycle engine 1 is cooled by a heat exchange medium such as cooling water. . The heat exchange medium flows into the heat exchange medium flow path 47 from the inflow hole 51 as indicated by an arrow 50,
It flows inside the heat exchange medium flow channel 47 and flows out of the outflow hole 52. When the heat exchange medium flows through the heat exchange medium flow path 47, the heat exchange medium comes into contact with an annular heat exchange fin 48 formed on the outer surface of the heat exchange cylinder 42 to perform heat exchange.

On the other hand, the working gas flowing into the heat exchanger 40 flows through the working gas
It flows axially along 9. At this time, the working gas comes into contact with the offset strip fins 35 to perform heat exchange. Since the working gas can contact the offset strip fin 35 with a large area, the heat transfer area increases and the heat exchange performance improves.

FIGS. 11 to 13 show the second embodiment of the heat exchanger of the present invention.
The following shows an example. The heat exchanger 55 of this embodiment has an outer sleeve 56 and a cylindrical heat exchange cylinder 57 inserted into the outer sleeve 56, with or without an inner cylinder (liner) 58. Displacer cylinders 6 and 7 of a heat engine as shown in FIG.
Is fitted and attached to the outer circumference of the.

The heat exchange cylinder 57 is, as in the first embodiment,
It is formed in a cylindrical shape having an appropriate thickness, and an annular sealing portion 59 in which a seal similar to that of the first embodiment is fitted is formed at each of the upper and lower ends of the heat exchange cylinder 57. An annular space surrounded by the upper and lower sealing portions 59, the outer surface of the heat exchange cylinder 57, and the inner surface of the outer sleeve 56 forms a heat exchange medium flow channel 60 through which a heat exchange medium such as cooling water flows.

In this embodiment, unlike the first embodiment,
The offset strip fins 35 are provided facing the outer surface of the heat exchange cylinder 57, that is, the heat exchange medium flow path 60. That is, the offset strip fin 35 shown in FIG.
7 are aligned in the axial direction and brazed to the outer surface 61 of the heat exchange cylinder 57.

At one axial end (upper end in the figure) of the outer sleeve 56, an inflow hole 62 for a heat exchange medium is provided, and on the other hand, the other axial end (lower end in the figure) of the outer sleeve 56 is provided. Is provided with an outflow hole 63 for a heat exchange medium. The heat exchange medium flows into the heat exchanger 55 from the inflow hole 62, passes through the heat exchange medium flow path 60, undergoes heat exchange, and flows out of the outflow hole 63.

A space formed by the heat exchange cylinder 57 and the inner cylinder 58 or the displacer cylinder disposed inside the heat exchange cylinder 57 forms a working gas flow path 64 of a heat engine such as helium gas. Thus, spline-shaped cooling fins are formed. More specifically, a large number of microgrooves 65 extending in the axial direction are formed by wire cutting on the entire inner peripheral surface of the heat exchange cylinder 57 to form spline-shaped cooling fins 66.

The operation of the second embodiment will be described. Vilmier cycle engine 1 by heat exchanger 55
The case where heat exchange is performed such that the working gas is cooled by a heat exchange medium such as cooling water will be described. The heat exchange medium flows into the heat exchange medium flow channel 60 through the inflow hole 62,
It flows in the heat exchange medium channel 60 and flows out of the outflow hole 63. When the heat exchange medium flows through the heat exchange medium flow path 60, the heat exchange medium contacts the offset strip fins 35 formed on the outer surface of the heat exchange cylinder 57 to perform heat exchange.

On the other hand, the working gas flows in the working gas flow path 64 in the axial direction while contacting the spline fins 66 in the working gas flow path 64, and heat exchange is performed.

In the first or second embodiment, offset strip fins are provided on the inner or outer surface of the heat exchange tube. However, offset strip fins are provided on both the inner surface and the outer surface of the heat exchange tube. The heat exchanger may be configured such that the working gas and the heat exchange medium contact the respective offset strip fins.

Although the present invention has been described with respect to an annular heat exchanger disposed on the outer periphery of a displacer cylinder of a Vilmier cycle engine, the invention is not limited to such an annular heat exchanger but disclosed in Japanese Patent Application Laid-Open No. Hei 9-152210. The heat exchanger may be a tubular heat exchanger disposed in a pipe through which the working gas flows, like the heat exchanger disclosed in the publication.

That is, a solid spline shaft is fitted inside the heat exchange cylinder to form a flow path for the working gas between the spline groove formed on the outer surface of the heat exchange cylinder and the heat exchange cylinder. Offset strip fins 35 around the outside of the cylinder
May be used as a cylindrical heat exchanger.

The above embodiment is an example in which the heat exchanger of the present invention is applied to a heat exchanger of a Vilmier cycle engine.
It goes without saying that the present invention is also applied to heat exchangers of heat engines such as Stirling equipment and Kuku-Javlov cycle equipment.

[0038]

According to the present invention, as described above, the offset strip fins are fixed to either or both of the outer surface and the inner surface of the heat exchange cylinder, and the working gas flow path and the heat exchange medium of the heat engine are provided. To both or one of the
Since the offset strip fins are used, the heat exchanger is easy to manufacture, the cost is low, and the long belt is bent in a zigzag pattern to increase the contact area, so heat exchange is possible. The heat exchange performance of the vessel can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a Vilmier cycle engine which is an example of a heat engine suitable for applying the heat exchanger of the present invention.

FIG. 2 is a plan view showing a conventional heat exchanger.

FIG. 3 is a sectional view taken along the line AA of FIG. 3;

FIG. 4 is a plan view showing another conventional heat exchanger.

FIG. 5 is a sectional view taken along the line BB of FIG. 4;

FIG. 6 is a view showing an offset strip fin of the present invention.

FIG. 7 is an enlarged view of a main part of FIG. 6;

FIG. 8 is a plan view showing a first embodiment of the heat exchanger of the present invention.

FIG. 9 is an enlarged view of a main part of FIG. 8;

FIG. 10 is a sectional view taken along the line CC of FIG. 8;

FIG. 11 is a view showing a second embodiment of the heat exchanger of the present invention.

FIG. 12 is a sectional view taken along the line DD in FIG. 11;

FIG. 13 is an enlarged view of a main part of FIG.

[Description of Signs] 1 Vilmier cycle engine 2 High temperature side displacer 3 Low temperature side displacer 6 High temperature side cylinder 7 Low temperature side cylinder 11 High temperature side regenerator 12 Medium temperature side heat exchanger 15 Low temperature side heat exchanger 16 Low temperature side regenerator Reference Signs List 22 Shell and tube heat exchanger 26 Tube 28 Plate fin heat exchanger 30 Heat exchanger body 31 Flow path 33 Groove 35 Offset strip fin 38 Elongated strip 39 Sectional path 40 Heat exchanger 41 Outer sleeve 42 Heat exchange Cylinder 43 sealing portion 48 fin 51 inflow hole 52 outflow hole 55 heat exchanger 56 outer sleeve 62 inflow hole 63 outflow hole 65 microgroove 66 fin

Claims (6)

[Claims] 1. A working gas and a heat exchange cylinder of a heat engine having an outer cylinder and a heat exchange cylinder inserted and fixed in the outer cylinder, and flowing through a working gas flow path along an inner surface of the heat exchange cylinder. A heat exchanger for a heat engine that exchanges heat with a heat exchange medium flowing through a heat exchange medium flow path along the outer surface of the heat exchanger, wherein the heat exchanger faces the working gas flow path. A heat exchanger for a heat engine, comprising: an offset strip fin fixed to an inner surface of an exchange cylinder. 2. An outer cylinder, and a heat exchange cylinder inserted and fixed to the outer cylinder, and a working gas of a heat engine flowing through a working gas flow path along an inner surface of the heat exchange cylinder and a heat exchange cylinder. A heat exchanger for a heat engine that performs heat exchange with a heat exchange medium flowing through a heat exchange medium flow path along an outer surface, wherein the heat exchanger is arranged to face the heat exchange medium flow path. A heat exchanger for a heat engine, comprising: an offset strip fin fixed to an outer surface of an exchange cylinder. 3. A working gas of a heat engine, which has an outer cylinder and a heat exchange cylinder inserted and fixed to the outer cylinder, and flows through a working gas flow path along an inner surface of the heat exchange cylinder. A heat exchanger for a heat engine that performs heat exchange with a heat exchange medium flowing through a heat exchange medium flow path along an outer surface, wherein the heat exchange medium is arranged so as to face the working gas flow path. An offset strip fin fixed to the inner surface of the tube, and an offset strip fin fixed to the outer surface of the heat exchange tube so as to face the heat exchange medium flow path. Heat exchanger for engines. 4. The heat exchanger for a heat engine according to claim 1, wherein the heat engine is a Stirling cycle device. 5. The heat exchanger for a heat engine according to claim 1, wherein the heat engine is a Vilmier cycle machine. 6. The heat exchanger for a heat engine according to claim 1, wherein the heat engine is a Kuku-Javlov cycle machine.