JPS5938516B2 - Heat exchanger manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a plate-fin type heat exchanger used as a heat exchanger for various types of refrigeration and air-conditioning equipment, or as an oil cooler for various engines.

A large number of plates are stacked with two types of fins bent in a zigzag pattern perpendicular to each other alternately interposed, and end bars and side bars that function as spacers are alternately placed at the ends between each plate. The plate-fin type heat exchanger is a plate-fin type heat exchanger in which mutually orthogonal fluid passages are alternately formed between the plates, and these are brazed to form an integral structure.
It is widely used as a heat exchanger for cooling equipment, an oil cooler for engines, etc.

The above plate/fin type heat exchanger is temporarily assembled by stacking plates, fins and end bars, plates, fins and side bars in the correct order, fixing this state with a jig and brazing in a furnace. However, when dozens of solid parts are stacked together by hand, it is extremely difficult to completely eliminate gaps between each part, and it is difficult to completely eliminate gaps between each part. It is difficult to completely correct the misalignment of the end face by hand, and in the end, it is necessary to correct the end face after brazing is completed, which is not only very time-consuming, but also causes the parts to deform during the correction work. In addition, if the correction is insufficient, it may cause problems such as fluid leakage, which is often inconvenient.

Therefore, notches are provided at each corner of the plate, which is the main component of the heat exchanger, and protrusions for positioning the end bars and side bars are formed on each edge of the plate, and the assembly jig is Form a guide surface in the guide frame that corresponds to the notch in the plate, insert the plate with the square notch along the guide surface of the assembly jig, and then place the fin on the plate. Then, position the end bar with its outer surface on the protrusion formed on the edge of the plate and the jig guide surface, and place the end bar with its inner surface in contact with the fin end, and place the next plate on the guide surface in the same way as above. After that, place the fins and side bars in the same way, and in this way, stack the multi-stage plates, fins, end bars, side bars, etc. one after another, thereby completing the temporary assembly work. Measures have been developed to simplify the process and prevent parts from becoming loose during temporary assembly (see Japanese Patent Publication No. 56-47472).

However, in the conventional method as described above, notches and protrusions on the edges must be formed in all of the many plates that are the main parts, which increases the plate manufacturing process and manufacturing time, resulting in a considerable increase in cost. Not only that, but
The ends of the fins are used as stoppers for the inner surfaces of the end bars and side bars, but the fins do not have enough support strength to prevent the end bars and side bars from shifting inward, and are useless as stoppers. In some cases, the end bar or side bar may ride on the protrusion on the edge of the plate, creating a gap, which may cause liquid leakage after brazing. The present invention aims to provide a solution to all the above-mentioned conventional drawbacks, and will be described below with reference to embodiments shown in the accompanying drawings. In the present invention, the first
As shown in Figure 2, pin holes 61 for fixing the block are provided near the left and right ends, and bolt insertion holes 62 are provided near the front and rear ends.
, an upper base 6'' having the same shape as the lower base 6, and left and right blocks 8 and 9 interposed near the left and right ends of the upper and lower bases 6 and , a temporary assembly jig A with a shape having a bottom surface, a top surface, and both left and right sides.
Configure.

The left and right procks 8 and 9 forming both the left and right side surfaces of the temporary assembly jig A have guide portions 81, 81 and 91, 91 that protrude inward near the ends in the front and back direction, respectively, Each guide portion has stopper surfaces 82 and 92 for guiding and regulating the end surface and outer surface of the end bar 12 and stopper surfaces 83 and 93 for guiding and regulating the end surface and outer surface of the side bar 13, which will be described later, are continuous in the vertical direction. Holes 84 and 94 for pins 10 are provided for fixing stopper plates 11 and 12 that guide and regulate the inner surfaces of the end bar 12 and the side bar 13.

The stopper plates 11 and 12 guide and regulate the inner surfaces of the end bar 12 and the side bar 13, respectively, as described above, and the end surfaces 11a and 12a of the stopper plates 11 and 12 are squares of the plate 1, which will be described later. It is designed to guide and regulate each peripheral surface around the area.

A method for assembling and manufacturing a heat exchanger using the temporary assembly jig A configured as described above will be explained step by step below.

First, the left and right blocks 8 and 9 are placed upright on the left and right ends of the lower base 6, with their pin holes 85 and 95 aligned with the pin hole 61 of the base 6, and the pins 10 are inserted into the pin holes to secure them. Stopper plates 11, 1 to blocks 8, 9
2 are fixed with pins 10, respectively.

Next, a plate 1 formed by cutting an aluminum brazing sheet into a rectangular shape is attached to the stopper plates 11 and 12.
The plate 1 is inserted from top to bottom and placed on the lower base 6 while guiding the edge surfaces 11a and 12a of the square portion of the plate 1.

Then, an end bar 12 is constructed by cutting a molded material with a rectangular cross section made by extrusion molding of a corrosion-resistant aluminum alloy material into a dimension slightly longer than the longitudinal length of the plate 1 (approximately 5 to 20 degrees longer). 9 stopper surface 82, 9
2 and guide the end surface, outer surface and inner surface to the stopper plate 11? The fins 4, which are made by bending a corrosion-resistant aluminum thin plate in a zigzag shape, are placed on the left and right sides of the plate 1, and the fins 4 are placed on the left and right end bars so that the ridge lines of their peaks and valleys face in the front-rear direction. Set between 2 and 2.

Then, after inserting and stacking the next plate 1 in the same manner as described above, a molded material having the same square cross section as the end bar 2 is placed with a dimension slightly longer than the horizontal length of the plate 1 (approximately 5 to 20 mm).
A pair of front and rear side bars 3, 3, which are cut into lengths (longer than about mm), are attached to the stopper surfaces 83, 9 of the blocks 8, 9.
Fins 5 are placed at the front and rear of the insertion plate 1 with their end surfaces, outer surfaces, and inner surfaces guided by the stopper plates 12 and 3, and are made of the same material as the fins 4 and have ridge lines of peaks and valleys oriented in the left-right direction. between the front and rear sidebars 3 and 3.

The front and rear edges of the fin 4 are regulated by the edge surface 11a of the stopper plate 11, the left and right edges are regulated by the inner surface of the end bar 12, and the other fin 5 has its front and rear edges regulated by the side bar 3. The inner surface, left and right edges of the stopper plate 12
are regulated by the edge surfaces 12a of each.

Thereafter, the steps described above are repeated one after another until the required number of layers are stacked up to the upper edge of the blocks 8 and 9.

When the above parts are laminated, plate 1, end bar 2,
Sidebar 13, fins 4 and 5 are all blocks 8 and 9
and stopper plates 11, 12 pin-coupled thereto.
etc., the parts are perfectly positioned, and there is no misalignment between the parts.

When the lamination is completed, the upper base 6 is placed on the top surface of the blocks 8 and 9.
”, pin hole 6V and pin hole 85 of blocks 8 and 9,
After aligning 95″ and inserting pin 10 into it to secure it,
Pass the bolt 13 from below through the bolt insertion holes 67, 62 of the upper and lower bases 6', 6, drive the wedge 14 into the wedge driving hole 13a provided in the bolt 13, and insert the multiple bolts into the upper and lower bases 5, 6. Fix it at 13VC.

In this case, by marking the driving depth of the wedge 14I1C in advance, the stacked parts can be evenly sandwiched between the upper and lower bases 6', 6. After fixing the upper and lower bases 6' and 6 with bolts 13, remove the pin 10 and remove the stopper plate 11, and remove the blocks 8 and 9 by pulling them out in the left and right direction.
Each part is sandwiched between the upper and lower bases 5 and 6 at a predetermined pressure and placed in a furnace such as a vacuum furnace, and is brazed in the specified furnace to form a heat exchanger as shown in Figure 3. Configure core B.

This heat exchanger core B has two headers 15, 15'', 16, 15 as shown in Figures 5 and 6 depending on the purpose of use.
The heat exchanger is manufactured by inserting and assembling the end bar 1 2 and the side bar 1 3 using the protruding ends as guides from one direction or four directions, and fixing them by fitting or welding.

In this case, the end bar 2 protruding from the plate edge
And the tip of the sidebar 13 is cut off after the heat exchanger core B is manufactured if a header is not required.

For example, the lower base 6 and the upper base 6'' are made of stainless steel, the blocks 8 and 9 are made of thick aluminum plates, and the stopper plates 11 and 12 are made of aluminum plates.The pin 10 is made of stainless steel. As described above, according to the present invention, the upper and lower bases and the guide surfaces for the end bars and the side bars are formed upright between the upper and lower bases, and the guide surfaces for the end bars and the side bars are also formed. A temporary assembly jig is constructed by combining the left and right blocks to which the stopper plate that guides the fins is attached by inserting a pin. Since parts such as fins and fins are stacked one after another with their positions regulated, the work of stacking each part is simplified, and there is no misalignment between parts during temporary assembly, making correction work easier. This eliminates the need for assembling, significantly reducing assembly man-hours.

In addition, since the blocks and stopper plates are all connected by inserting pins, the stopper plates and auxiliary jigs such as blocks can be easily removed after the temporary assembly is completed, and the lower and upper bases are soldered together. It has the functions of both a temporary assembly jig and a temporary assembly jig, and therefore the number of jigs can be significantly reduced.

Furthermore, in the present invention, each component of the heat exchanger is a plate made of a simple flat plate, an end bar and a side bar with a simple rectangular cross section, a fin with a simple wave shape, etc., and no complicated press processing is required. Each part is extremely easy and inexpensive to manufacture, which reduces the manufacturing cost of the heat exchanger, and eliminates the above-mentioned misalignment of each part, so there is no variation and defective products such as liquid leakage. Coupled with the fact that there is no occurrence of , this can bring about great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a temporary assembly jig used in the present invention, and FIG. 2 is a sectional view taken along line XX in FIG. 1. Figure 3 A, C]. C shows a front view, a side view, and a plan view of a heat exchange core assembled using the jigs shown in FIGS. 1 and 2. 4 and 5 are an explanatory plan view and an explanatory front view showing a state in which the header is assembled. 1... Plate, 2... End bar, 3... Side bar, 4, 5... Fin,
6...Lower base, 6''...Upper base, 8,9.
...Protsuku, 81, 91...Guidance part, 82, 83
, 92, 93... Guide surface, 10... Pin, 11, 1
2...Stopper plate, 13...Bolt, 14.
... Wedge, 15, 15', 16, 16'... Hetsuda, A... Temporary assembly jig, B... Heat exchanger core.

Claims (1)

[Scope of Claims] 1. Left and right blocks having guide surfaces for guiding and regulating the end surfaces and outer surfaces of the end bar and the side bar are connected and erected by inserting pins on both sides of the lower base, and the left and right blocks are connected to A stopper plate that guides and regulates the inner surface of the end bar, side bar, and the edge of the plate and fin is installed and fixed by inserting a pin, and the plate, end bar, side bar, fin, etc. are guided by the guide surface and stopper plate of the block. After stacking is completed, stack the upper base on the top of the block and secure it by inserting a pin, then pass the fixing bolts through the lower and upper bases and attach the laminated parts. The heat exchanger core is formed by clamping and fixing at a predetermined pressure, then pulling out each pin, removing the block and stopper plate, and brazing the laminated parts in a furnace while clamping them between the lower and upper bases. A method for manufacturing a heat exchanger, comprising: obtaining a plate-fin type heat exchanger by fixing a header to the heat exchanger core. 2. The end bars and side bars are configured to have dimensions longer than the longitudinal and lateral lengths of the plates, respectively, and the guide surfaces and stopper plates of the blocks extend beyond the portions of the end plates and side plates that protrude from the plate ends. 2. The method of manufacturing a heat exchanger according to claim 1, wherein a side surface, an end surface, and an inner surface are guided and regulated.