JP2584745Y2 - Stacked heat exchanger - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a stacked heat exchanger.

[0002]

2. Description of the Related Art Quadrilateral plates are stacked at a predetermined interval, and two opposite sides thereof are closed to form a fluid flow path.
There is known a stacked heat exchanger in which these are crossed at right angles. This example is disclosed in, for example, Japanese Utility Model Laid-Open No. 53-5344. This heat exchanger forms a flat tubular body by superimposing an upper plate with two opposite sides of a rectangular plate bent downward and a lower plate with an upward bent,
Further, the cylindrical bodies are stacked in a direction perpendicular to each other to form a laminated body, and four side surfaces of the laminated body are used as an inlet and an outlet of two orthogonal fluids. Fins are provided in the fluid passage between the plates.

[0003]

The conventional stacked heat exchanger as described above has the following problems. (A) Since the boundary wall between the two fluids is constituted by two plates, the heat transfer efficiency is low. (B) The upper plate and the lower plate have different shapes. In the case of having the same shape, they must be inverted and assembled together, and furthermore, they are stacked in an orthogonal direction, so that the assembly work at the time of manufacturing is complicated. (C) At the time of manufacture, since the above-mentioned tubular body only overlaps the bent portions of the two sides of the plate, the brazing in the furnace may cause the plate to warp or slide. Further, since the plate is bent by the weight jig, the stacking height is reduced, and an excessive load is applied to the fin, the shape after completion is poor, and the residual stress of the member is large. (D) Since it is a combination of flat cylindrical bodies, a portion serving as a duct mounting seat is not formed at a corner of a side surface in four directions, and a separate duct mounting frame or the like must be provided.

[0004]

In order to solve the above-mentioned conventional problems, the laminated heat exchanger of the present invention is provided with a flared flank extending from the base to the tip on the periphery of the circular bottom plate. > Place the raised plates on the end of each plate flange.
The end portion is overlapped with the base outer surface of the next plate inscribed , the flange is provided with two openings, the position is symmetric with respect to the center, the central angle of the opening width is smaller than 90 °,
The plates are stacked in directions shifted by 90 ° from each other, a plurality of window holes are respectively formed by openings in four directions on the side surfaces, and fins are arranged in gaps between the bottom plates of the respective plates to flow the fluid. Road.

In this case, the order of stacking the plates is 90
It is desirable that the two directions shifted by two degrees are periodically repeated, but it is not always necessary to alternately change the direction for each layer. It is appropriately determined according to the required flow rate of the two fluids and the allowable pressure loss. Also, the fin shape need not be the same for the two fluids.

[0006]

In this heat exchanger, fluid flows in from the opposite window,
The two fluids flow out and flow in orthogonal directions to exchange heat via the bottom plate.

In this heat exchanger, when plates of the same shape are overlapped, the plates are positioned and assembled by overlapping the flanges, so that the assembly is easy. Absent. Further, since a continuous portion of overlapping flanges is formed at each central angle of 90 ° on both sides of each window hole, when a duct for guiding inflow and outflow of fluid is installed, it becomes a mounting seat portion.

[0008]

FIG. 1 shows an embodiment. The laminated heat exchanger 1 includes a laminated plate 2, an end plate 3 for closing an open end thereof,
The fins 4 are interposed between the plates 2. As shown in FIG. 2, the plate 2 has a circular bottom plate 5 with a flange 6 rising at the peripheral edge thereof, and two punched holes 7 provided at opposing positions of the flange 6 to form openings. The central angle with respect to the width of the punched hole 7 is smaller than 90 °. Further flange 6
A vertical groove 8 protruding inward is provided at a position symmetrical on both sides of the punching hole 7 at a central angle of 90 °. The vicinity of the front end of the flange 6 is substantially wider than the base near the bottom plate 5 by an amount corresponding to the plate thickness, and when superposed, the base outer surface of the flange of the next plate is inscribed. The plates 2 are stacked so that the directions of the punches 7 are alternately orthogonal to each other, and the vertical grooves 8 are overlapped in the vertical direction. Corrugated fins 4 are provided between the bottom plates 5 of the plates 2, and the open end surface at the top of the stack is closed by an end plate 3 having substantially the same shape as the bottom plate 5.

The directions in which the plates 2 are stacked need not be alternately orthogonal. For example, the punching hole 7 may be repeated in the order of two layers in the front-rear direction and one layer in the left-right direction. It is desirable that the order in the laminating direction is regularly repeated with a cycle as short as possible. In this lamination,
The vertical grooves 8 serve as positioning means for making the plates 2 orthogonal at right angles. Opening of plate 2, ie, punched hole 7
Are arranged in four directions on the side surfaces of the stacked plates 2, and form window holes 9 of the heat exchanger 1. Since the lateral width of the window hole 9 is smaller than the diameter of the bottom plate 5, the fin 4 is divided into fin divided pieces 4a, 4b, 4c as shown in FIG. The fin is divided into a fin divided piece 4b which obliquely extends and reduces the flow width of the fluid, and a fin divided piece 4c which guides the vicinity of the maximum width of the flow. In this way, the flow width is increased, and the heat transfer surface of the bottom plate 5 is effectively used. Providing a short flange 10 on the peripheral edge of the end plate 3 is convenient for assembling. If further strength is required, the end plate 3 is made of a thick plate, and the bottom plate 5 at the other end is made of a thick plate,
And a reinforcing plate 11 having the same shape as the above. Further, the vertically long joining plate 12 having the ribs 12a fitted into the continuous vertical grooves 8 is
And provided in contact with the side surfaces of the stacked flanges 6. These plate 2 and fin split pieces 4a, 4
The fins 4 composed of b and 4c, the end plate 3, and the reinforcing plate 11 and the joining plate 12, which are provided as necessary, are assembled and integrally fixed by brazing in a furnace.

The heat exchanger 1 often surrounds a plurality of window holes 9 in four directions, and ducts 15 for guiding fluid inflow and outflow.
16, 17, 18, and (FIG. 3) are attached. The portion of the flange 6 excluding the punched hole 7 serves as a mounting margin for the duct.
The joining plate 12 is fixed to the mounting margin, and the mounting flanges 15a... 18a of the ducts 15, 16, 17, 18
Is bonded to the bonding plate 12. Bonding uses fixing means such as brazing or screwing. When there is a gap between the flange 6, the joining plate 12, and the mounting flanges 12a to 18a, the space is airtightly closed by filling with a brazing material or a sealing agent, using a backing plate, or the like.

FIG. 5 shows another example of a plate. The plate 22 has a flange 26 rising on the peripheral edge of the circular bottom plate 25, a notch 27 is provided at two opposing positions, and a vertical groove 28 is provided.
Is provided. When the plates 22 are stacked, the notch 27 is formed by the base of the flange 26 of the next layer.
Is closed on the open side, and a window hole 9 (FIG. 1) is defined.

This heat exchanger 1 is used, for example, as an air preheater that heats combustion air with exhaust gas (600 to 700 ° C.) of a gas turbine engine. In this case, each member is made of stainless steel such as SUS304SUS430 and is integrated by copper brazing.

[0013]

The stacked heat exchanger of the present invention is a plate-like plate having a circular bottom plate with a flared flange extending from the base to the tip at the periphery and two opposed openings on the flange. The end of the flange on each plate
Since the base outer surface of the rate is inlaid and laminated and formed,
Positioning is naturally performed at the time of assembling, so that assembling is easy, and there is no displacement of the members during brazing. Accordingly, no defective shape or defective brazing occurs, and the assembling operation is simple and easy, so that the manufacturing cost is reduced. Further, since the bottom plate does not overlap the heat transfer surfaces of the two fluids, the heat exchange efficiency is high and the weight is light. Also, since each plate is shaped like a circular dish,
Easy to form and less durable.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a perspective view showing a configuration of a plate used in the embodiment.

FIG. 3 is a perspective view showing a state where a duct is attached to the heat exchanger of the embodiment.

FIG. 4 is a cross-sectional view showing a fin used in the embodiment.

FIG. 5 is a perspective view showing another example of the plate.

[Explanation of symbols]

 2, 22 plate 3 end plate 4 fin 5, 25 bottom plate 6, 26 flange 7 punching hole (opening) 9 window hole 27 notch (opening)

Claims (1)

(57) [Scope of request for utility model registration] 1. From the base to the tip on the periphery of a circular bottom plate
A plate with two flanges symmetrically symmetrical about the center is provided between the bottom plates. Be spaced and oriented 90 ° out of phase so that the flange tip of each plate is
Laminated by inscribed a base outer surface, the one open end, and substantially closed by an end plate of the same shape and the bottom plate, the four directions of the sides, to form a plurality of window opening by the opening, the bottom plates of each plate Stacked heat exchanger with fins arranged on