JP2005282961A - Plate type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate type heat exchanger which has a wide brazing area by linear braze-bonding to enhance the pressure resistant ability, and is hard to break by the pressure of a flowing fluid. <P>SOLUTION: A plurality of herringbone plates 4 having an uneven herringbone pattern 13 are laminated with each other, and reinforcing plates 18 are laminated between the herringbone plates 4. The top parts of the herringbone patterns 13 and the reinforcing plates 18 are linearly brought in contact with each other and then braze-bonded to form many through holes 20 in a portion except the braze-bonding parts of the reinforcing plates 18. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plate heat exchanger.

A plate-type heat exchanger in which a plurality of herringbone plates are stacked and a two-fluid flow path for performing heat exchange is formed between the herringbone plates is known (see Patent Document 1).
In such a plate-type heat exchanger, variously pressurized fluids enter the flow path depending on the application, and this pressure may damage the heat exchanger. In particular, when the pressure difference between the two fluids is large or the pressure fluctuates greatly, the fluid is easily damaged.

As a cause of breakage, the herringbone pattern of the herringbone plates arranged up and down is formed in the opposite direction, and the intersecting tops are brazed in point contact, and as a result, the brazing area is not sufficient, This is often due to weak pressure resistance.
Conventionally, in the end plate opposite to the end plate having the fluid inlet / outlet, the position facing the fluid passage hole is reinforced to prevent the end plate itself from being deformed or cracked due to the pressure of the fluid, or even if the plate is damaged. A plate-type heat exchanger has been proposed in which an intermediate heat exchange fluid is interposed between the two fluid passages so that the fluids do not mix (see Patent Document 2), but what reinforces the brazed joint is known. It was not done.

JP 2002-35929 A JP-A-9-189495

  The problem to be solved by the present invention is to provide a plate heat exchanger that has a wide brazing area and is not easily damaged by the pressure of fluid flowing inside.

  The plate heat exchanger according to the present invention is formed by laminating a plurality of herringbone plates having an uneven herringbone pattern and forming a flow path between each herringbone plate, and a reinforcing plate is provided between each herringbone plate. The top portions of the herringbone pattern and the reinforcing plate are line-contacted and brazed and joined, and a plurality of through holes are formed in a portion excluding the brazed joint portion of the reinforcing plate.

According to the present invention, since the herringbone plate is brazed linearly, the brazing area is widened and the pressure resistance is increased. Therefore, the herringbone plate can be prevented from being damaged by the pressure of the fluid flowing inside.
In addition, since the reinforcing plate has a large number of through holes, the fluid flow in the flow path formed between the herringbone plates is not hindered.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the plate heat exchanger 1 according to the present invention includes a plurality of herringbone plates 4 stacked between upper and lower cover plates 2, 3, and each herringbone plate 4 includes a plurality of herringbone plates 4. A reinforcing plate 18 is laminated, and a two-fluid flow path for heat exchange is formed between the cover plates 2 and 3 and the herringbone plate 4 and between each herringbone plate 4.
The cover plates 2 and 3, the herringbone plate 4 and the reinforcing plate 18 are made of metal that can be joined by brazing such as titanium or stainless steel.

The upper and lower cover plates 2 and 3 are flat plates, and as shown in FIG. 3, the first to fourth through holes 5, 6, 7, 8 is drilled.
A first nipple 9 for supplying one fluid is connected to the first through-hole 5 of the cover plate 3, and one fluid is connected to the second through-hole 6 facing diagonally thereof. The second nipple 10 for discharging the water is connected.
A third nipple 11 for supplying the other fluid is connected to the third through hole 7 at one end of the other diagonal line, and the fourth through hole 8 facing the other is connected to the other through A fourth nipple 12 for discharging the fluid is connected.

As shown in FIG. 1, an uneven herringbone pattern 13 is formed on the herringbone plate 4 in order to increase the area and generate turbulence in the fluid flowing through the flow path. Further, an edge wall 14 is erected along the periphery of the herringbone plate 4 so as to be slightly higher than the thickness of the flow path formed between the herringbone plates 4.
Circular holes 15 are provided in the four corners of the herringbone plate 4 for ascending and descending the two fluids, respectively, and spacers are provided at the peripheral edges of the circular holes 15 formed at both ends of one diagonal line. A cylindrical portion 16 is erected.

As shown in FIG. 1, the uppermost herringbone plate 4 is not provided with circular holes 15, and three reinforcing projections 17 are formed at both ends of one diagonal line.
These herringbone plates 4 are arranged up and down so that the herringbone pattern 13 is reversed, and every other cylindrical portion 16 formed around the circular hole 15 is vertically opposed. The reinforcing plates 18 are stacked.

The reinforcing plate 18 is formed of a flat plate having substantially the same shape as the herringbone plate 4, and as shown in FIG. 4, circular cut portions 21 are formed at positions corresponding to the circular holes 15 of the herringbone plate 4 at the four corners of the reinforcing plate 18. Is formed.
The reinforcing plate 18 is formed with a plurality of through holes 20 in portions where the herringbone pattern 13 of the herringbone plate 4 disposed above and below the reinforcing plate 18 is not provided, and the flow of fluid in the flow path formed between the herringbone plates 4 is reduced. It is designed not to interfere.
The shape of the through hole 20 may be any shape such as a circle, a triangle, a quadrangle, and an irregular shape as long as the position of the herringbone pattern 13 is avoided.

As described above, the upper and lower cover plates 2 and 3, the plurality of herringbone plates 4 and the reinforcing plate 18 are stacked with the reinforcing plate 18 sandwiched between the herringbone plates 4, and the cover plates 2 and 3 are arranged vertically. The periphery of the herringbone plate 4 is brazed and joined.
Further, as shown in FIG. 5, the top of the herringbone pattern 13 of the herringbone plate 4, the cover plates 2 and 3 and the reinforcing plate 18 arranged above and below the brazing joint are brazed. Since the through hole 20 of the reinforcing plate 18 is formed at a position avoiding the herringbone pattern 13, the top of the herringbone pattern 13 is in line contact with the reinforcing plate 18, and the brazed joint extends in a band shape.

Further, the distal end of the cylindrical portion 16 of the herringbone plate 4 and the lower surface of the upper herringbone plate 4 are brazed and joined.
Therefore, the flow paths formed between the cover plates 2 and 3 and the herringbone plate 4 communicate with every other layer.
The first nipple 9 and the second nipple 10 are brazed to the lower cover plate 3, and the third nipple 11 and the fourth nipple 12 are brazed to the lowermost herringbone plate 4.

A circular hole 15 having a cylindrical portion 16 of the lowermost herringbone plate 4 immediately above the first through hole 5 and the second through hole 6 to which the first nipple 9 and the second nipple 10 are connected. And the cylindrical portion 16 of the lowermost herringbone plate 4 is not provided immediately above the third through hole 7 and the fourth through hole 8 to which the third nipple 11 and the fourth nipple 12 are connected. A circular hole 15 is arranged.
Accordingly, one fluid flows into the plate heat exchanger 1 through the first nipple 9 and the first through-hole 5, is blocked by the cylindrical portion 16, and enters the flow path of the other fluid. However, the fluid pressure reaches the uppermost stage of one of the fluid flow paths, goes down the flow path communicating with every other layer, and passes from the second nipple 10 and the second through hole 6 to the outside of the plate heat exchanger 1. To be discharged.

The other fluid flows into the plate heat exchanger 1 through the third nipple 11 and the third through hole 7, and similarly, the other fluid does not enter the flow path of the one fluid. It reaches the uppermost stage of the flow path, goes down the flow path communicating with every other layer, and is discharged from the fourth nipple 12 and the fourth through hole 8 to the outside of the plate heat exchanger 1.
During this time, heat exchange is efficiently performed between one fluid and the other fluid. In addition, since the herringbone plate 4 and the reinforcing plate 18 are line-contacted and brazed over a wide area, there is no fear that the brazed joint is damaged by the pressure of the fluid.
The detailed structure of the plate heat exchanger is not limited to the above embodiment. For example, the number of the herringbone plates 4 and the reinforcing plates 18, the shape of the herringbone pattern, and the like can be selected as appropriate.

The disassembled perspective view of the plate-type heat exchanger which shows the Example of this invention. The side view of the plate type heat exchanger which shows the Example of this invention. The bottom view of the plate type heat exchanger which shows the Example of this invention. The top view of the reinforcement plate which concerns on the Example of this invention. The principal part sectional drawing of the plate-type heat exchanger which shows the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate type heat exchanger 2 Upper cover plate 3 Lower cover plate 4 Herringbone plate 5 1st through-hole 6 2nd through-hole 7 3rd through-hole 8 4th through-hole 9 1st nipple 10 1st Two nipples 11 Third nipple 12 Fourth nipple 13 Herringbone pattern 14 Edge wall 15 Circular hole 16 Cylindrical portion 17 Protrusion 18 Reinforcement plate 20 Through hole 21 Cut portion

Claims (1)

In a plate heat exchanger in which a plurality of herringbone plates having an uneven herringbone pattern are stacked and a flow path is formed between each herringbone plate, a reinforcing plate is stacked between each herringbone plate, and the herringbone pattern The plate-type heat exchanger is characterized in that a top portion of the reinforcing plate and the reinforcing plate are line-contacted and brazed and a large number of through holes are formed in a portion excluding the brazed joint portion of the reinforcing plate.

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