JP3101470B2 - External combustion engine heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a heat exchanger of an external combustion engine used for cooling and heating, hot water supply, power and the like.

[0002]

2. Description of the Related Art Conventionally, the drilling of tube sheets and baffle plates of shell-and-tube type heat exchangers of external combustion engines such as the Bilmier cycle and the Stirling cycle as this type of apparatus is performed by drilling. Mainly machined. FIG. 5 shows a conventional tube plate 20 and baffle plate 21 assembled to a shell-and-tube type heat exchanger such as a medium-temperature heat exchanger and a low-temperature heat exchanger. The plate 20 and the baffle plate 21 are, as shown, a cylinder inner sleeve 22 of a heat exchanger.
A number of holes are provided between the tube sheet 20 and the baffle plate 21 so as to penetrate a plurality of tubes 24 for flowing a working gas. Is provided. The processing for making this hole has been performed by machining as described above. A heat exchange medium such as cooling water for exchanging heat with a working gas such as helium flowing inside the tube circulates in the direction from arrow A to arrow B.

[0003]

In spite of the large number of tube insertion holes required for tube plates and baffle plates of heat exchangers of external combustion engines, which are several hundred to 2,000, there are many. In the past, since the hole was drilled one by one into a thick tube sheet and a baffle plate, there was a problem that the tool life was short and the processing time was long. An object of the present invention is to provide a heat exchanger for an external combustion engine which solves the above-mentioned problems (problems) of the prior art.

[0004]

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, the present invention provides a cylinder filled with a working gas and a piston which divides the cylinder into an expansion chamber and a compression chamber. A heat exchanger, a regenerator and a shell-and-tube type heat exchanger installed between the expansion chamber and the compression chamber. The sheet is constituted by a laminated body in which a plurality of thin plates having holes formed by pressing, etching or the like are laminated, and they are integrally formed by soldering or diffusion bonding.

[0005]

The tube plate and the baffle plate are composed of a laminate of thin plates, and the tube insertion hole is formed by pressing or photo-etching on the thin plate. The tool life can be extended, and at the same time, drilling multiple holes is a means suitable for high-volume production, so that the drilling time is significantly reduced.

[0006]

An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram of an external combustion engine showing one embodiment of the present invention. In FIG. 1, reference numerals 1 and 2
Are the piston rods 3 arranged substantially at right angles to each other.
And a piston of a high-temperature displacer and a low-temperature displacer piston incorporating a high-temperature cylinder 5 and a low-temperature cylinder 6 enclosing a working medium, which reciprocate, respectively. A high temperature chamber (compression chamber) 5a of the cylinder 5 of the high temperature side display is connected to a heater 7 composed of a multi-tube tube.

A high-temperature side regenerator 9 and a medium-temperature side heat exchanger 10 are connected between the tip of the heater 7 and the medium-temperature chamber (expansion chamber) 5b of the high-temperature side cylinder 5, and the low-temperature side cylinder 6 A low-temperature heat exchanger 11 and a low-temperature regenerator 12 are interposed between the low-temperature chamber (compression chamber) 6a and the medium-temperature chamber (expansion chamber) 6b. Reference numeral 13 denotes a connection duct that connects the middle temperature chamber 5b of the high temperature cylinder 5 and the low temperature chamber 6a of the low temperature cylinder 6. Cross guides 14 and 15 are fixed to the piston rods 3 and 4, respectively. A crank mechanism 16 is connected to the cross guides 14 and 15, and when the crank mechanism 16 is started, an electric motor provided in a machine room or the like is started. After starting, the pistons 1 and 2 are reciprocated by rotating by the power of the external combustion engine itself after power is started. A heating means 17 such as a gas burner is provided above the high temperature side display.

Next, the operation of the external combustion engine will be described.
First, the high-temperature side displacer piston 1 and the low-temperature side displacer 90 which are shifted by 90 ° by the rotation of the crank mechanism 16.
If the piston 2 reciprocates, the high temperature side cylinder 5
The working gas in the high temperature chamber 5a is pushed out and guided to the high temperature regenerator 9. Similarly, the low-temperature chamber 6 of the low-temperature cylinder 6
The working gas a is pushed out and flows through the inside of the multi-tube tube of the low-temperature side heat exchanger 11.

FIG. 2 shows the intermediate-temperature side heat exchanger 10 shown in FIG.
2 shows an assembly configuration of a tube sheet 30 and a baffle plate 31 applied to the low-temperature side heat exchanger 11, that is, applied to a shell and tube heat exchanger. As shown in FIG. 2, a tube sheet 30 and a baffle plate 31 according to the present invention are provided.
Is composed of a laminate composed of a plurality of thin plates (for example, about 8 to 20). FIG. 3 shows a first embodiment of the tube sheet 30. As shown in FIG. 3, each of the ring-shaped thin plates 30A has a large number of holes 30B for inserting a multi-tube tube. -Tube diameter from normal φ1 to 2
In the case of about millimeters, about several hundred to about 2,000 holes are provided. The thickness of these thin plates 30A depends on the hole diameter, but is, for example, about 0.2 to 0.5 mm. Since the thickness of the thin plate is thin as described above, the hole is preferably formed by pressing or photo-etching without using a drill or the like as in the related art. This thin plate 30
A is a plurality of tubes that are stacked and inserted into each hole 30B.
And the cylinder inner sleeve 22 are assembled by joining means such as brazing or diffusion joining. Although the thin plate in FIG. 3 shows the case of the tube sheet 30, the same applies to the case of the baffle plate 31.

The shape of the tube sheet constituting the present invention is not limited to the ring shape as shown in the first embodiment. FIG. 4 shows a second embodiment of the tube sheet. In the case of the present embodiment, the first sheet is formed on the thin plate 30C formed in a disk shape.
As in the case of the third embodiment, the hole 30B is provided by the means described above.

[0011]

As described above, the present invention has the following excellent effects because the tube sheet and the baffle plate of the shell and tube heat exchanger are formed of a laminate of thin plates. Pressing or photo-etching can be applied to the drilling of a thin plate without using a drill or the like as in the prior art, so that mass productivity can be significantly improved. For this reason, compared with the case of machining with a drill or the like, the tool life during drilling is extended, and the machining time can be further reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an external combustion engine to which an embodiment of the present invention is applied.

FIG. 2 is a longitudinal sectional front view showing an assembling structure of a tube sheet and a baffle plate according to the present invention.

FIG. 3 is a perspective view showing a first embodiment of the tube sheet.

FIG. 4 is a perspective view showing a second embodiment of the tube sheet.

FIG. 5 is a vertical sectional front view showing an assembling structure of a tube sheet and a baffle plate in a conventional example.

[Explanation of symbols]

 22: Cylinder inner sleeve 23: Outer sleeve 24: Tube 30: Tube plate 30A: Thin plate 30B: Hole 30C: Thin plate 31: Baffle plate

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuhiko Ishino 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Masahisa Otake 2--18-3 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-U 4-136472 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25B 9/00 F02G 1/055 F28F 9/02

Claims (1)

(57) [Claims] 1. A cylinder filled with a working gas, a piston partitioning the cylinder into an expansion chamber and a compression chamber,
In an external combustion engine provided with a heater, a regenerator, and a shell and tube type heat exchanger installed between the expansion chamber and the compression chamber, a tube sheet and a baffle plate of the heat exchanger are provided. A heat exchanger for an external combustion engine, comprising: a laminate formed by laminating a plurality of thin plates having holes formed by pressing, etching, or the like, and forming them integrally by brazing, diffusion bonding, or the like.