JPS60180632A - Manufacture of plate-type heat exchanger - Google Patents

Abstract

PURPOSE:To assemble easily the titled heat exchanger and to prevent the generation of a clearance caused by the melting of a brazing filler metal by forming foils of brazing filler metals into the same flat shapes and piling up plates with their bottom walls up in covered drain like, so that the rising walls of upper and lower plates are directly fitted to each other through the foil. CONSTITUTION:A pair of reinforcing plates 11 having each the same shape as that of a distance piece 3 and no through holes is put on an assembling tool 12, a brazing foil 10e is put on the plates 11 and further a plate 1 is put on the tool 12 with its bottom wall le up so as not block up through holes 1a, 1b. A brazing foil 10a is put on this bottom wall 1e and a pair of distance pieces 3 and a fin 4 are further put on this foil 10a. Successively, a foil 10a is put thereon and a plate 1 is put on this foil 10a with its bottom wall 1e up by bringing its rising wall 1c into contact with the base part of the rising wall 1c of the lower stage so as to fit the wall 1c to the base of wall 1c of the lower stage. In the same manner, the plates 1 are piled up so as to obtain the prescribed number of stages, a pair of flanges 2 is put on the uppermost surface through the foil 10c and this piled up assembly is brazed in one body by inserting it into a furnace to obtain a plate-type heat exchanger.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a plate heat exchanger, particularly a so-called housingless type heat exchanger.

An example of this type of plate heat exchanger is the 1st J
m, as shown in Figure 2.

A standing wall IC is provided on the front and rear edges of the rectangular plate 1 by bending it from the bottom wall 1e to form a groove, and spacer plates 3 are provided at both left and right ends of the bottom wall 1e. A hole 3a and a notch hole 3b communicating upwardly and downwardly and inwardly are provided so that the through hole communicates with through holes 1a and lb provided in the plate l, and the notched hole 3b is arranged alternately in upper and lower stages. In this way, when the two types of fluids flow through the through holes, they pass between the plates at every other stage. An uneven fin 4 is provided between each plate. Also, the bottom plate has through holes 1a and lb.
Either no cover is provided or a blind cover is fixed.

As a method for manufacturing this type of heat exchanger, the following method was proposed as described in Utility Application No. 58-25800 filed by the present applicant. That is, as shown in FIGS. 2 and 3, a wax foil 10a having approximately the same shape as the bottom wall 1e is placed on a groove-shaped plate 1 with an open top, and a concave-convex fin 4 is placed in the center on top of the wax foil 10a. There is a spacer plate 3 on the bottom wall 1e, and on top of that, there are rising pieces 10 on the front and rear edges of the flat plate part, which has almost the same shape as the bottom wall 1e.
The solder foils 10b provided with d are successively stacked one on top of the other, and then the bottom wall 1e of the next plate 1 is placed on the upright wall 1 of the plate 1.
Insert the solder foil 10b inside the rising piece 10d placed on the inner surface of the solder foil 10b, and stack the solder foil 10b in the same manner as above until the required number of layers are stacked.
The flanges 2 with the holes 2b formed therein are placed on both ends of the plate via the solder foil 10c, and the thus obtained heat exchanger structure is placed in a furnace and brazed together.

In the manufacturing method described above, it is necessary to prepare wax foils 10a and 10b with different shapes, and wax foils 10a and 10b have different shapes.
There is an inconvenience that b must be processed into a three-dimensional dream shape. When assembling, the solder foil rising piece 10d must be inserted between the inner surface of the upright wall of the lower plate and the outer surface of the upright wall of the immediately upper plate, making the work extremely troublesome. . When the wax foil melts in the furnace, a gap will be created between the overlapping walls by the amount of the rising piece 10d, and if this cannot be compensated for by the sinking of the upper member, the adhesion will be insufficient and the brazing will be defective. It was easy for leaks to occur.

This invention was made in order to eliminate the above-mentioned problems. That is, by eliminating the rising pieces of wax foil and making the conventional wax foils 10a and 10h the same shape, eliminating the need for three-dimensional molding, the plates are stacked like a gutter with the bottom wall facing upward, and the rising walls are made of wax foil. It is easy to assemble by directly fitting the parts together without having to pinch them together, and eliminates gaps caused by melting of the solder.

The invention of Jin will be explained from Example SC. Figures 4 and 5
In the figure, a pair of reinforcing plates 11 having substantially the same shape as the spacing pieces 3 and having no through holes are placed on an assembly jig 12.
A wax foil 10e is placed on top of the through holes 1a, l.
The plate 1 is placed 1ζ on the assembly jig 12 in a face down state with the bottom wall 1e facing up so that the bottom wall 1e is covered. On its bottom wall is a wax foil 10a.

A pair of spacing pieces 3 and fins 4 are placed thereon as in the conventional example. It is placed on top of it in a standing piece. Thereafter, the solder foil 10a, the spacing C3, the fins 4, the solder foil 10a, and the plate 1 are repeatedly placed so that the required number of stages is achieved. At the top, the pair of flanges 2 described above are mounted via the wax foil 10c to obtain a heat exchanger structure. Next, this structure is heated in a furnace and brazed together to obtain a plate-type heat exchanger.

In the above manufacturing method, the solder foil 10a placed on the bottom wall 1e of the plate l is melted and soldered between the fins and spacing pieces sandwiched therein and the bottom wall, and The solder flows out to the peripheral edge of the plate, flows into the fitting portion of the upright wall of the plate and the upright wall immediately above, and brazes and fixes the contact portion of the upright walls. In addition, the standing wall 1c of the plate 1
By adding a horizontal piece 1d outward as shown in the figure, the fitting work becomes easier and the strength of the heat exchanger can be increased.

According to the manufacturing method of the present invention as described above, there is no need to form the wax foil three-dimensionally, and the wax foil corresponding to the upper and lower surfaces of the bottom wall of the plate can be made into the same shape, and the structure of the heat exchanger can be When assembling, there is no need for complicated work such as sandwiching and fitting wax foil between the upright walls, making assembly easy. Furthermore, since the upright walls are brought into direct contact with each other, there is no gap caused by melting of the sandwiched solder foil, and there is no risk of defective brazing or leakage.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a plate-type heat exchanger, Fig. 2 is a view showing a conventional component structure, Fig. 3 is a sectional view showing a conventional assembled state, and Fig. 4 is a manufacturing method of the present invention. FIG. 5 is a diagram illustrating the assembled state according to the present invention.

Claims (1)

[Claims] A pair of through holes are drilled at both left and right ends of the bottom wall, and the plate with the front and rear side edges bent from the bottom wall to form a standing wall is placed on an assembly jig with the bottom wall facing upward, and then placed on the assembly jig. A flat wax foil having approximately the same shape as the bottom wall is placed, a pair of through holes are bored at both ends of the solder foil, and a spacer plate is placed in one of the through holes with a notch that opens inward. , and a concave-convex fin with a spacing approximately the same height as the thickness of the plate is placed in the center, and a wax foil having the same shape as that described above is placed on the spacing plate and the fin, and a plate of the same shape as that described above is placed on an upright wall. Stack them so that their tips fit into the base of the upright wall of the lower plate, and then repeat the same process as above to stack each member in the required number of stages to assemble the heat exchanger structure, and then place the structure in the furnace. Plate-type heat that is heated in a heated furnace. Method of manufacturing an exchanger.