JPH038558A - Manufacture of plate fin heat exchanger - Google Patents

Abstract

PURPOSE:To improve the quality and reliability by arranging distance hollow bodies at side edge parts of plate fins, alternately laminating these through separated plates, pressurize-deforming the hollow bodies in gap between the laminated layers through brazing filler material, heating this in a vacuum furnace and brazing. CONSTITUTION:The distance hollow bodies having higher than height of the fin 8 are arranged at the side edge parts of the plate fins 8 to alternately laminate them through the separated plates 10. The brazing filler material is inserted in the gap between the laminated layers, and after that, the above distance hollow body is deformed under pressurizing to the height coincident with the height of the plate fin and charged into the vacuum furnace 24. At the time of making the vacuum atmosphere, as there is air in the distance hollow body, ideal load is applied between the separated plate and the distance hollow body at the time of brazing by returning back to the original shape, and the gap between the laminated layers is further stuck. By this method, the brazing property is improved and the quality and reliability of a heat exchanger can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a plate fin heat exchanger, and particularly to a method for manufacturing a plate fin heat exchanger with a distance bar and a separate plate or a side plate. The present invention relates to a method of manufacturing a plate-fin heat exchanger with improved brazing properties.

[Prior Art] FIGS. 4 and 5 show an example of a plate-fin heat exchanger. As shown in FIG. 3 and header parts 4 attached to each of the four sides of this core part 3. Each of these header sections 4 is formed with a flange section 5 that serves as an inlet/outlet for fluid. In the figure, 6a is a gas inlet, 6b is a gas outlet, 7a is an air inlet, and 7b is an air outlet.

6 shows the structure of the fin stack 2. As shown in FIG. 6, distance pars 9 are provided at the side edges of each plate fin 8. As shown in FIG. These plate fins 8 include an I-type gas side plate fin 8a shown in FIG. 7, and a Z-type air side plate fin 8a shown in FIG.
b, and these are separate plates 1o
They are alternately stacked together with the distance pars 9 via the distance pars 9. As shown in FIG. 9, this fin stacked portion 2 is held between side plates 11, which serve as the outer walls of the plate-fin heat exchanger 1. Further, a brazing material (not shown) is interposed in the laminated gap between the fin plate 8, which has the distance par 9 on the side edge thereof, and the separate plate 10 or the side plate 11, respectively. The core portion 3 thus laminated is held by a pressure jig (not shown) and a load is applied in the lamination direction to reduce the lamination gap between the pretofin 8 and the separate plate 10 or side plate 11. It was then carried into a vacuum furnace (not shown) in this pressurized state, where it was heated and brazed.

[Problems to be Solved by the Invention] By the way, in this type of plate-fin heat exchanger 1, when brazing the lamination gap of the core portion 3, in order to improve brazing properties, it is necessary to change the lamination direction. The fin height h of the plate fin 8 and the thickness t of the distance par 9 are made to match so that this pressure is applied uniformly to the fin plate 8 and the distance par 9. There is.

However, in order to match the fin height h of the plate fin 8 with the thickness of the distance par 9, the distance par 9 must be hard-cut and have a meandering shape, and the plate fin should be It is necessary to match the fin height h of 8, but all plate fins 8
It is difficult to make height adjustments. Moreover, if there is a difference between the fin height h of the plate fin 8 and the thickness t of the distance par 9, the lamination gap between the fin plate 8 and the separate grate 10 or the side plate 11 will increase, and the brazing load will increase. There was a problem in that the brazing properties were not applied uniformly, resulting in uneven brazing properties, and internal leakage occurred in the plate-fin heat exchanger 1.

In view of the above problems, the present invention improves the brazing properties between the plate fins of the core portion and the separate grate or side plate, thereby improving the quality and reliability of the plate fin heat exchanger. An object of the present invention is to provide a method for manufacturing a plate-fin heat exchanger.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides hollow bodies with a distance larger than the height of the fins on the side edges of the plate fins, and stacks these hollow bodies alternately via separate grates, A brazing material is interposed in the laminated gap, and then the distance hollow body is deformed under pressure to match the fin height of the plate fin, and then heated in a vacuum furnace to braze the laminated gap. This is what I did.

[Operation] Since the distance hollow body is pressurized and deformed to match the fin height of the plate fin, the stacking gap between the plate fin and the separate grate is reduced. Furthermore, when the inside of the vacuum furnace is made into a vacuum atmosphere, since there is air inside the distance hollow body, the deformed distance hollow body tries to return to its original state due to the internal pressure, and the space between the adjacent eyebrows moves through the separate plate. Because they urge each other, an ideal back shape is applied between the separate plate and the distance hollow body during brazing, the laminated gap is further brought into close contact, and the brazing load is evenly applied. It is possible to form a pretofin heat exchanger with improved brazing properties, high quality, and reliability.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

The method for manufacturing a plate-fin heat exchanger according to the present invention is characterized in particular in the manufacture of the core part, and is shown in FIGS. 1 to 3.
This is done as shown in the figure. First, as shown in Figure 1,
A flat side plate 11, which becomes the outer wall of the plate fin heat exchanger l, is placed horizontally on the base of a pressurizing jig (not shown).The plate fins 8 and the sebaret plate 10 are placed on this side plate 11. The plate fins 8 are stacked sequentially through the plate fins 8 and the side plate 11 is placed on top again.
consists of an I-shaped gas side plate fin 8a shown in FIG. 7 for forming a gas passage, and a Z-shaped air side plate fin 8b shown in FIG. 8 for forming an air passage. There is. That is, these gas side plate fins 8a and air side plate fins 8 are disposed on the side plate 11.
b are alternately stacked via the separate grate 10, since the plate fins 8 are formed in a rectangular wave shape in cross section.
The above separate plate 10 (separate plate 10 and side grate 11 at the top, bottom and top of fi)
It will be held in place to form sections. When stacking these side grates 11, grate fins 8, and separate plates 10, a distance hollow body 23 is provided at the side edge of the plate fin 8 in the fin direction.In this embodiment, this distance hollow body 23 is a cylindrical body. It is sealed by closing both ends.

The outer diameter R of the distance hollow body 23 is larger than the fin height h of the plate fin 8. Therefore, in the stacked state shown in FIG. 1, the upper edge of each plate fin 8 is not in contact with the separate plate 10 or the side plate 10.The cross-sectional shape of the distance hollow body 23 does not necessarily have to be cylindrical. For example, the core part 3 of the plate-fin heat exchanger 1 may be a rectangular cylinder with curvature at the corners.
When laminating these members, a thin plate-shaped solder is placed in the lamination gap between the plate fin 8 and the separate plate 10 or the side plate 11, each having the distance hollow body 23 on the side edge. A material (not shown) is provided.

Next, the core portion 3 thus laminated is held between a pressure jig and a load is applied from the outside of the side plate 11 in the lamination direction, as shown in FIG. This pressing jig consists of, for example, two rigid flat plates and bolts and nuts inserted through them.

The thickness of the plate used to form the distance hollow body 23 is set to such a thickness that it can deform in response to this load.Thereby, when a load is applied to the side plate 11, the distance hollow body 23 The body 23 is deformed under pressure,
The outer diameter r in the stacking direction decreases, and the cross-sectional shape becomes elliptical. Then, with the outer diameter r of the distance hollow body 23 in the stacking direction matching the fin height h of the plate fin 8, and the entire stacking surface being flush, the tightening force of the bolts and nuts of the pressing jig is applied. The core portion 3 consisting of the side plate 11 and the fin laminated portion 2 is restrained and fixed.

Thereafter, the core portion 3 thus restrained and fixed is carried into a vacuum furnace 24, as shown in FIG. After the vacuum furnace 24 is evacuated to create a vacuum atmosphere, it is heated to a temperature higher than the melting point of the brazing filler metal interposed in the lamination gap of the core portion 3. By heating in this vacuum atmosphere, the brazing material is melted without being oxidized, and the plate fin 8 and the separate plate 10 or side plate 11 are brazed and fixed.

Next, the operation of the above embodiment will be described.

When the core portion 3 is laminated, the outer diameter R of the distance hollow body 23 is formed to be larger than the fin height h of the plate fin 8, as shown in FIG. As shown in Figure 2, the side grate 1 is
When a load is applied from the outside in the stacking direction, the distance hollow body 23 is deformed under pressure. Then, when the outer diameter r of the distance hollow body 23 in the stacking direction matches the fin height h of the plate fin 8 and the 81 layer surfaces are flush, the tightening force of the bolts and nuts of the pressing jig is adjusted. The core portion 3 consisting of the side grates 11 and the fin laminated portion 2 is restrained and fixed.

In this way, the above-mentioned distance hollow body 23! When there is no difference between the outer diameter r in the a-layer direction and the fin height h of the plate fin 8, the lamination gap between the plate fin 8 and the separate plate 10 decreases.

Thereafter, the constrained and fixed core part 3 is carried into the vacuum furnace 24 as shown in FIG. , due to its internal pressure, the distance hollow body 23
As the outer diameter r in the stacking direction attempts to return to its original state from the deformed state, the adjacent layers are urged against each other as shown by the arrow P via the separate plate 10. Therefore, due to this biasing force P, an ideal load is applied between the separate plate 10 and the distance hollow body 23 during brazing, and the lamination gap is further brought into close contact. Therefore, the brazing mold is evenly applied to the fin lamination part 2, and the brazing material penetrates into the tiny lamination gap by capillary action, improving brazing performance and providing high quality and reliable plate fin heat. It is possible to form the exchanger 1.

As described above, according to the present invention, the respective laminated surfaces can be matched very easily, and the machining accuracy of the constituent materials of the core portion 3 of the plate-fin heat exchanger 1 can be relaxed.

[Effects of the Invention] In summary, according to the present invention, it is possible to improve the brazing properties between the plate fins of the core portion and the separate plates or side plates, thereby improving the quality and reliability of the plate fin heat exchanger. It has an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the laminated state of the core part in the method for manufacturing a plate fin heat exchanger of the present invention, and FIG. 2 is a side view showing the pressurized state in the method for manufacturing the plate fin heat exchanger of the present invention. Fig. 3 is a side view showing the heating state in the method for manufacturing a plate fin heat exchanger of the present invention, Fig. 4 is a side view of the plate fin heat exchanger, and Fig. 5 is a partially cutaway front view of the plate fin heat exchanger. 6 is a perspective view showing the fin area R# of a conventional plate fin heat exchanger, FIG. 7 is a front view showing the gas side plate fin, and FIG. 8 is a front view showing the air side plate fin. FIG. 9 is a side view showing a pressurized state in a conventional method for manufacturing a plate-fin heat exchanger. In the figure, 1 is a plate fin heat exchanger, 8 is a plate fin, 10 is a separate plate, 23 is a distance hollow body, 24 is a vacuum furnace, and h is the fin height. Figure 2 Figure 3 Figure 6

Claims (1)

[Claims] 1. A distance hollow body larger than the fin height is provided at the side edge of the plate fin, and these are alternately laminated via separate plates, and a brazing material is interposed in the gap between the laminations, and then the distance hollow body is A method for manufacturing a plate fin heat exchanger, characterized in that the plate fin heat exchanger is deformed under pressure to match the fin height of the plate fin, and then heated in a vacuum furnace to braze the laminated gap.