JPH01240225A - Manufacture of heat exchanger - Google Patents

Abstract

PURPOSE:To surely form a space between laminated sheets of wire gauze and reduce leakage by laminating a plurality of sheets of wire gauze via a spacer which is vaporized and disappears at a high temperature along the axial direction in each of first and second passages partitioned by inner and outer cylinders and exposing the whole to a high temperature and surely forming a space between the laminated sheets of wire gauze. CONSTITUTION:A plurality of sheets of wire gauze 10, 11 are laminated along the axial direction in a first passage partitioned by outer and inner cylinders 1, 12 and a second passage formed in the inner cylinder 12 and are brought into contact with the wall of the inner cylinder 12 to perform heat exchange. Each spacer 13, 14 formed with parafin, etc., which is vaporized and disappears at a high temperature is interposed between each of laminated sheets of wire gauze 10 and 11, and laminatedly formed. By exposing the whole to a high temperature, the spacers 13, 14 disappear. Hence, a space is surely formed between each of the laminated sheets of wire gauze 10 and 11 eliminating direct heat transfer in the axial direction due to contact between the sheets of wire gauze with each other, reducing heat leakage and improving efficiency.

Description

[Detailed description of the invention] [Object of the invention] (Industrial application field) The present invention provides a method for manufacturing a heat exchanger used as a heat storage device for a Stirling engine, a regenerator for an inverted Stirling refrigerator, or a helium liquefaction machine. Regarding.

(Prior Art) A conventional heat exchanger, for example, the heat exchanger disclosed in Japanese Unexamined Patent Publication No. 60-243484, includes an outer cylinder and an inner cylinder disposed inside the outer cylinder. There is a first tube between the outer cylinder and the inner cylinder.
A passageway is defined within the inner cylinder, and a second passageway is respectively defined within the inner cylinder. Gas flows in one direction in the first passage, and this gas exchanges heat with gas flowing in the other direction in the second passage through the wall of the inner cylinder. Therefore, a plurality of first wire meshes are stacked in the axial direction in the first passage, and a plurality of second wire meshes are stacked in the axial direction in the second passage. Gas flowing at a distant location comes into thermal contact with the wall of the inner cylinder via the first wire mesh, and gas flowing through the center of the inner cylinder comes into thermal contact with the wall of the inner cylinder via the second wire mesh.

(Problem to be Solved by the Invention) However, since the first wire meshes adjacent in the axial direction are in contact with each other, a portion of the heat transferred from the first wire mesh to the wall of the inner cylinder is transferred to the adjacent first wire mesh. It escapes in the axial direction through . The same applies to the second wire mesh. In other words, the heat transfer area in the axial direction increases, the heat leak in the axial direction increases, and the temperature efficiency of the heat exchanger decreases.

Therefore, it is an object of the present invention to provide a method for manufacturing a heat exchanger that reduces the heat transfer area in the axial direction.

[Structure of the invention]

(Means for Solving the Problems) Means for solving the above-mentioned technical problems include an outer cylinder, an inner cylinder disposed inside the outer cylinder, and a gap between the outer cylinder and the inner cylinder. a first passage defined in the inner cylinder, a second passage defined in the inner cylinder, a plurality of first wire meshes stacked in the axial direction in the first passage, and a plurality of first wire meshes stacked in the axial direction in the second passage. A method for manufacturing a heat exchanger comprising a plurality of second wire meshes stacked along the line, the method comprising the following steps (a) to 0).

(a) A first scrubber made of a substance that vaporizes and disappears at high temperatures is interposed between the first wire meshes.

(b) A second spacer made of a substance that vaporizes and disappears at high temperatures is interposed between the second wire meshes.

(c) The outer cylinder, the inner cylinder, the first wire mesh, the first spacer, the second wire mesh, and the second spacer are integrally exposed to high temperature.

(Function) In this configuration, when the outer cylinder, inner cylinder, first wire mesh, first spacer, second wire mesh, and second spacer are integrally exposed to high temperature in the manufacturing process of the heat exchanger, the spacer vaporizes and By melting, voids are formed between the first wire meshes and between the second wire meshes.

Due to this gap, there is no direct thermal contact between the first wire meshes and the second wire meshes arranged in the axial direction, and the heat transfer area in the axial direction is reduced.

(Example) An example of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 4, a heat exchanger H includes an outer cylinder 1. As shown in FIGS. Inside the outer cylinder 1, annular plates 3 and 4 are arranged at a predetermined interval in the axial direction, and the right and left ends of the inner cylinder 12 are connected to the hole 3a of the annular plate 3 and the annular plate 4. It is fitted and supported in the hole 4a. In the first iJIl path 20, which is defined between the outer cylinder 1 and the inner cylinder 12 and whose cross section is not ring-shaped, a plurality of first wire meshes 10 are arranged at predetermined intervals and gaps 1 along the axial direction.
They are arranged sequentially in rows with 5 in between. The inner edge of each first wire mesh 10 is in contact with the outer surface of the wall of the inner cylinder 12. Further, in the first passage 22, a plurality of second wire meshes 11 are sequentially arranged in a row along the axial direction with predetermined intervals and gaps 16, and each second wire mesh! The outer edge of 1J11 is in contact with the inner surface of the wall of inner cylinder 12 (FIG. 3).

The first wire mesh 10 on the leftmost side (right side) and the annular plate 4 (annular plate 3
) A space 22 (space 23) is defined between the inlet port 7 (outlet boat plate 3) flowing through the first passage 22 and the left opening of the outer cylinder 1. A space 24 (space 25) is defined between the lid 5 to be closed (the lid 2 to close the right opening), and the space 24 (space 25) is the inlet port 7 (outlet port 7 that flows through the second passage 22). Boat 8)
Communicate with.

Here, based on FIG. 4, a method for defining the voids 15 (gaps 16) between the first wire meshes 10 (between the second wire meshes 11) will be described. When installing (press fitting/adhering) the wire mesh 11) in the first passage 20 (second passage 21), the
spacer 13 (spacer 14) made of a substance (for example, paraffin) that vaporizes and disappears when exposed to high temperatures
) is now available. And heat exchanger H
When the assembled heat exchanger I-1 is first exposed to high temperature, the spacer 13 (spacer 14) is melted and vaporized, and the first gap 15 (second gap 16) is defined.

〔Effect of the invention〕

As described above, the present invention includes an outer cylinder, an inner cylinder disposed inside the outer cylinder, a first passage defined between the outer cylinder and the inner cylinder, and the inner cylinder. a plurality of first wire meshes stacked along the axial direction within the first channel; and a plurality of second wire meshes stacked along the axial direction within the second iJll path. A method for manufacturing a heat exchanger comprising the following steps (a) to (c).

(a) A first spacer made of a substance that vaporizes and disappears at high temperatures is interposed between the first wire meshes.

(b) A second spacer made of a substance that vaporizes and disappears at high temperatures is interposed between the second wire meshes.

(c) The outer cylinder, the inner cylinder, the first wire mesh, the first spacer, the second wire mesh, and the second spacer are integrally exposed to high temperature.

In this configuration, in the manufacturing process of the heat exchanger, when the outer cylinder, inner cylinder, first wire mesh, first spacer, second wire mesh, and second spacer are exposed as one body to high temperature, each spacer vaporizes and melts. Thus, gaps are formed between the first wire meshes and between the second wire meshes.

Due to this gap, there is no direct thermal contact between the first wire meshes and the second wire meshes arranged in the axial direction, and the heat transfer area in the axial direction is reduced. Thus, axial heat leakage is reduced and the thermal efficiency of the heat exchanger is improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a heat exchanger obtained by the manufacturing method according to the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. FIG. 4 is a diagram showing a method for forming voids. 1: Outer cylinder, 10: First wire mesh, 11: Second wire mesh, 12:
Inner cylinder, 15/16: Gap, 20: First passage, 21: Second
aisle. Utility model registration applicant Aisin Seiki Co., Ltd. Representative Kiyoshi Ito

Claims (1)

[Scope of Claims] An outer cylinder, an inner cylinder disposed inside the outer cylinder, a first passage defined between the outer cylinder and the inner cylinder, and a first passage defined within the inner cylinder. a plurality of first wire meshes stacked along the axial direction in the first passageway, and a plurality of second wire meshes stacked along the axial direction inside the second passageway. A method for manufacturing a heat exchanger, the method comprising the following steps (a) to (c). (a) A first spacer made of a substance that vaporizes and disappears at high temperatures is interposed between the first wire meshes. (b) A second spacer made of a substance that vaporizes and disappears at high temperatures is interposed between the second wire meshes. (c) The outer cylinder, the inner cylinder, the first wire mesh, the first spacer, the second wire mesh, and the second spacer are integrally exposed to high temperature.