JPH03133565A - Manufacture of plate fin heat exchanger - Google Patents

Abstract

PURPOSE:To improve the reliability of a heat exchanger for plate fins by arranging fins between two plates and on the outer surfaces of the plates, brazing them to form a unit, performing a pressure proof test and laminating and joining sound units. CONSTITUTION:The plates 21 and the fins 22, 23 are laminated alternately, fluid passages 26, 27 are formed between the plates 21 to manufacture a plate fin heat exchanger. In that case, fin 22 is arranged between two plates 21 and the fin 23 is arranged on the outer surfaces of the plates 21. These are brazed to form a unit 20. Thereafter, the pressure proof test is carried out and a specified number of sound units 20 are laminated and joined. In this way, soundness of the brazed part can be confirmed on the way of the manufacturing process.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in the manufacturing method of a plate-fin heat exchanger. This is to improve reliability.

[Conventional technology]

There are various types of plate-fin heat exchangers that have been conventionally known as heat exchangers capable of obtaining high heat transfer area density.

For example, a plate-fin heat exchanger with a shell has a heat exchange section 3 in which plates and fins are alternately laminated, as shown in FIGS. 2(a) and 2(b), and this heat exchange section 3 has a cylindrical shape. It is housed in a container (shell) 4 and fixed to the container 4 by a support plate 5.

In this heat exchange section 3, as shown in the manufacturing process in FIG.
Fins 2a forming a high temperature fluid flow path 6 are arranged on one surface of the plate 1, and fins 2b forming a low temperature fluid flow path 7 are arranged on the other surface of the plate 1, and are stacked alternately. A high temperature fluid inlet header 6a and a high temperature fluid outlet header 6 are provided at both ends of the high temperature fluid flow path 6.
b are connected in communication. The high-temperature fluid inlet header 6a and the high-temperature fluid outlet header 6b are each led out from inside the container 4.

On the other hand, both ends of the low temperature fluid flow path 7 are open into the container 4,
The container 4 functions as a header, and a partition plate 8 is provided in the center of the container 4 to divide it into two in the axial direction, so that one end is the header 4a on the low temperature fluid inlet side, and the other end is on the low temperature fluid outlet side. It is header 4b.

A low temperature fluid inlet nozzle 9 is connected to the low temperature fluid inlet header 4a, and a low temperature fluid outlet nozzle 10 is connected to the low temperature fluid outlet header 4b.

[Problem to be solved by the invention]

In the heat exchange section 3 of such a plate-fin heat exchanger,
The fins 2 promote heat transfer, and the plate 1
The surface is divided into small sections so that even if the plate 1 is thin, it can withstand high fluid pressure.

In order for the heat exchange section 3 to withstand such high fluid pressure, the plate 1 and the tips of the fins 2 must be reliably brazed.

However, in the conventional manufacturing method of a plate-fin heat exchanger, as shown in FIG.
1.11, as shown in FIG. 3(b), they are put into a furnace and integrally brazed together. For this reason, the integrity of the heat exchange section 3 can only be inspected at the final product stage, and even if a defect in brazing is discovered, it cannot be repaired, and the heat exchange section 3 in a stacked state cannot be repaired. The problem is that the whole thing has to be discarded.

This invention has been made in view of the problems of the prior art, and provides a method for manufacturing a plate fin heat exchanger that allows the integrity of brazing to be confirmed during manufacturing and allows a highly reliable product to be obtained. This is what I am trying to do.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has been developed to produce a plate-fin heat exchanger in which plates and fins are alternately stacked to form a fluid flow path with the plates separated. After arranging the fins and brazing them together to form the unit, we conducted a pressure test and
The device is characterized in that a predetermined number of healthy units are stacked and joined together.

[For production]

According to this method of manufacturing a plate-fin heat exchanger, two plates and fins placed in the middle and on both sides form one unit, each unit is brazed, and a pressure test is performed. , the required number of units with good test results are stacked together to form a heat exchanger, and the integrity of the parts can be confirmed during brazing during the manufacturing process. , the reliability of the plate-fin heat exchanger is greatly improved, and there is no waste of materials.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a process diagram of an embodiment of the method for manufacturing a plate-fin heat exchanger of the present invention.

In this method of manufacturing a plate fin heat exchanger, the method shown in Fig. 1 (
As shown in a), two plates 21. are made of thin plates.
21 and 2 types of strip plates continuously bent into rectangular waveforms 3
The two flat plate fins 22 and 23 are laminated, and then the first
As shown in FIG. 1(b), these units are brazed to form one unit 20, and the unit 20 is subjected to a pressure test.After this, as shown in FIG. 1(c), these units are healthy. 20 are further laminated to form the heat exchange section 3 (see FIG. 2) of the plate-fin heat exchanger. First, the plate 21 constituting the unit 20 has a hexagonal thin plate with a flange portion 21a that serves as a joint portion around the periphery, and a fin attachment portion 21b having a depth half the height H of the fin 22 is formed inside the flange portion 21a. Four parts 21C are formed at both ends for attaching the high-temperature fluid header 24 or the high-temperature fluid outlet header 25.

One unit 20 is formed by stacking two such plates 21 and the flange portions 1a so that the fin attachment portions 21b are on the outside.

Next, two plates 21.2 of the fins 22.23
The fin 22 inserted into the fin attachment part 21b of 1 is
It forms the high temperature fluid flow path 26, and has a cross-sectional shape in which the strip plate is continuously bent into a rectangular waveform with a fin height of H, and the outer shape in a planar state is hexagonal. Attachment holes 22a are formed at both ends for attaching the high-temperature fluid header 24 or the high-temperature fluid outlet header 25.

The high-temperature fluid flow path 26 of this fin 22 has a straight central flow path 26a, and a diagonal flow that continues obliquely from the outside in the direction of the central axis at both ends thereof and opens into the mounting hole 22a. 26b.

Also, two plates 21.2 of the fins 22.23
Fin 23 arranged outside the fin attachment part 21b of No. 1
is to form a low temperature fluid flow path 27, and the strip plate is continuously connected to HI3 whose fin height is half the height of the fin 22.
It has a cross-sectional shape bent into a rectangular waveform, and has a hexagonal outer shape in a planar state, and has mounting holes 23a at both ends for mounting the high-temperature fluid population header 24 or the high-temperature fluid outlet header 25. It is formed.

The low-temperature fluid flow path 27 of the fin 23 has a straight central flow path 27a, which continues diagonally outward from the central axis direction on both sides of the center flow path 27a, and has an open end at the outer side 23b of the fin 23. It is composed of a diagonal flow path 27b.

The plate 21 and the fins 22.23 are stacked as shown in FIG. The fins 22 are placed inside, and then
Fin attachment part 2 on the outside of each plate 21゜21
Fins 23° 23 are arranged and stacked on 1b.

After this, as shown in FIG. 1(b), the flange portion 1a of the plate 21, the plate 21 and the fin 22,
The contact portions are brazed together to complete one unit 20.

A large number of units 20 are made in the same manner.

A pressurized fluid is put between the two plates 21 and 21 of each of the units 20 made in this way, and a pressure test is conducted under a predetermined pressure to confirm the soundness of the brazing.

Through this pressure test, defective units 20, such as those with defective brazing, are repaired or discarded.

Next, the unit 20 whose soundness has been confirmed is shown in FIG.
), a predetermined number of stages are stacked between the two upper and lower side plates 28, 28, and the contact portions of the units 20 are joined.

In this stacked state of the units 20, the fins 23 are continuous in two stages between the units 20, but this part becomes the low temperature fluid flow path 27, and the height of the fins 23 is HI3. Therefore, the fin height of the two stages of fins 23, 23 is H as a whole, so there is no height problem, and since no large pressure is applied, there is no strength problem even if they are not joined.

The heat exchange section 3 manufactured in this way is shown in FIGS. 2(a) and 2(b).
) is installed in the shell (container) 4 in the same manner as described above.

According to the manufacturing method of such a plate fin heat exchanger, during manufacturing, after ensuring the integrity of one of the fluid flow paths on the high pressure side, in the case of this embodiment, the high temperature fluid flow path 26, the heat exchanger is The exchange part 3 can be used as the exchange part 3, and the reliability of the plate-fin heat exchanger can be greatly improved.

In the above embodiments, the case where the heat exchanger is applied to a plate fin heat exchanger with a shell is described, but the present invention is not limited to this type.

Furthermore, the shapes of the plates and fins are not limited to hexagonal shapes or rectangular waveforms.

〔Effect of the invention〕

As described above in detail with one embodiment, according to the method for manufacturing a plate-fin heat exchanger of the present invention, one unit is formed by two plates and fins arranged in the middle and on both sides. However, after each unit is brazed, a pressure test is conducted, and the required number of units with good test results are stacked to form a heat exchanger, so brazing is done during the manufacturing process to ensure the integrity of the parts. Since these units are stacked together, the reliability of the plate-fin heat exchanger can be greatly improved, and there is no waste of materials.

20...Unit, 21...Plate, 22.23
...Fin, 24...High temperature fluid inlet header, 25.
・・High temperature fluid outlet header, 26 ・・High temperature fluid flow path, 27
... Low temperature fluid flow path, 28 ... Side plate.

[Brief explanation of the drawing]

FIG. 1 is a process diagram of an embodiment of the method for manufacturing a plate-fin heat exchanger of the present invention. Fig. 2 shows a plate-fin type heat exchanger with a shell as an example to which the present invention is applied, Fig. 2(a) is a partially cutaway side view, and Fig. 2(b) is a cross-sectional view. be. FIG. 3 is a process diagram of a conventional manufacturing method.

Claims (1)

[Claims] When manufacturing a plate-fin heat exchanger in which plates and fins are alternately stacked to form a fluid flow path with the plates separated, fins are placed between two plates and on the outer surface of the plates, and these are brazed together. 1. A method for manufacturing a plate-fin heat exchanger, characterized in that after the units are formed, a pressure test is conducted, and a predetermined number of sound units are stacked and bonded.