JPH0942885A - Plate type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a communication between a cold water passage and a hot water passage or prevent a leakage of either cold water or hot water out of a heat exchanger in advance in a plate type heat exchanger in which a plurality of stepped pan-like corrugated plates having a specified shape are piled up vertically and medium flow passages (cold water passage and hot water passage) in two systems are alternatively formed. SOLUTION: A folding radius R1 of an outer circumferential raising piece 2i cooperatively arranged at a lower stepped surface 2a of each of stepped pan-like corrugated plates 2 is set to be lower than a folding radius R2 of an outer circumferential raised piece 2h cooperatively arranged at an upper stepped surface 2f of the stepped pan-like corrugated plate 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate in which a plurality of stepped plate-shaped corrugated plates having a specific shape are stacked vertically and two medium passages (cold water passages and hot water passages) are alternately formed. Type heat exchanger.

[0002]

2. Description of the Related Art Conventionally, in this type of plate heat exchanger, the lower step surface of the upper stepped corrugated plate and the upper step surface of the lower stepped corrugated plate are brought into contact with each other without a gap. By doing so, the cold water passage and the hot water passage are separated from each other.

[0003]

However, since the outer peripheral rising pieces on both sides of each stepped dish-shaped corrugated plate are bent at the same bending radius, a plurality of stepped dish-shaped corrugated plates are formed. When they are stacked, the degree of close contact between the stepped dish-shaped corrugated plates is low, and a gap may be formed depending on the case. Therefore, the cold water passage and the hot water passage communicate with each other,
There was a risk that cold water or hot water would leak to the outside, impairing the heat exchange function.

In view of the above-mentioned circumstances, the present invention has devised the shape of the outer peripheral rising piece of each stepped corrugated plate so that the cold water passage and the hot water passage can communicate with each other or the cold water or the hot water outside. It is an object of the present invention to provide a plate heat exchanger capable of preventing leakage in advance.

[0005]

Means for Solving the Problems That is, according to the present invention, a corrugated heat transfer partition wall and first and second through holes formed on the upper surface so as to face each other with the heat transfer partition wall interposed therebetween, A third lower surface formed to face each other with the heat transfer partition interposed therebetween.
And a plurality of stepped dish-shaped corrugated plates provided with a fourth through hole, an outer peripheral rising piece continuously provided on the upper step surface, and an outer peripheral rising piece continuously provided on the lower step surface. Are stacked vertically so that the lower surface of the stepped dish-shaped plate and the upper surface of the lower stepped dish-shaped plate come into contact with each other, and these stepped dish-shaped plates are fixed to each other to A plate-type heat exchanger in which medium passages of a system are alternately formed, and the bending radius of an outer peripheral start-up piece continuously connected to the lower step surface of each stepped dish-shaped plate It is configured to have a radius smaller than the bending radius of the outer peripheral rising piece connected to the upper surface of the plate.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a plate type heat exchanger according to the present invention, FIG. 2 is an exploded perspective view of the plate type heat exchanger shown in FIG. 1, and FIG. 3 is a stepped dish-shaped plate. 2A is a plan view thereof, FIG. 4B is a front view thereof, FIG. 4C is a side view thereof, and FIG. 4 is a longitudinal sectional view showing the vicinity of a joint of the plate heat exchanger shown in FIG. 5 is an enlarged cross-sectional view showing a fitted state of the spacer shown in FIG. 4, and FIG. 6 is an enlarged cross-sectional view showing a fitted state of the stepped dish-shaped corrugated plates shown in FIG.

As shown in FIGS. 1 and 2, the plate heat exchanger 1 according to the present invention includes a plurality of stepped dish-shaped corrugated plates 2 stacked one above the other, and these stepped dish-shaped corrugated plates. 2. Flat plate-like top plate 3 and bottom plate 4 arranged above and below 2
And the first, second, third and fourth fitted on the top plate 3.
It is composed of joints 5, 6, 7, and 8 and a ring-shaped spacer 9.

That is, each stepped dish-shaped corrugated plate 2 has a corrugated heat transfer partition 2e as shown in FIG. 3, and the heat transfer partition 2e is provided on both upper and lower sides of FIG. 3 (a). Upper surface 2
f and the lower surface 2g are formed. A first through hole 2a and a second through hole 2b are formed on the upper surface 2f so as to face each other with the heat transfer partition wall 2e interposed therebetween, and the lower surface 2g is formed.
The third through-hole 2c and the fourth through-hole 2d are formed so as to face each other with the heat transfer partition wall 2e interposed therebetween. Further, on the left side of the upper step surface 2f in FIG.
3a are continuously provided, and an outer peripheral rising piece 2i is continuously provided on the right side of the lower step surface 2g in FIG. 3A.

A plurality of (for example, 18 in FIG. 4) the stepped corrugated plate 2 is laminated.
In two vertically adjacent plate-shaped corrugated plates 2, as shown in FIG. 6, a lower stepped surface 2g of the upper plate-shaped plate-shaped corrugated plate 2A and a lower plate-shaped plate-shaped corrugated plate 2B.
The upper step surface 2f of the upper step surface 2f is in contact with the upper step surface 2f of the upper step plate-shaped corrugated plate 2A.
A space is formed between the lower step surface 2g of B and the lower step surface 2g.

Here, the bending radius R1 of the outer peripheral rising piece 2i continuously provided on the lower surface 2g of the plate-shaped corrugated plate 2 with steps.
Is smaller than the bending radius R2 of the outer peripheral rising piece 2h connected to the upper surface 2f (for example, R1: R2 = 1:
2), therefore upper and lower stepped corrugated plates 2A, 2
The closeness of B increases. As a result, the lower step surface 2g of the upper stepped corrugated plate 2A and the upper step surface 2f of the lower stepped corrugated plate 2B come into contact with each other without a gap, and the upper stepped corrugated plate 2A 2A outer peripheral rising piece 2i and lower stepped corrugated plate 2B outer peripheral rising piece 2h
And the outer peripheral rising piece 2h of the upper stepped dish-shaped corrugated plate 2A and the outer peripheral rising piece 2i of the lower stepped dish-shaped corrugated plate 2B contact each other without a gap.

Further, the plate-shaped corrugated plate 2 with steps has its outer peripheral rising pieces 2h, 2i fixed to each other.
The system medium passages, that is, the cold water passages and the hot water passages are formed alternately.

On the other hand, as shown in FIG. 2, the top plate 3 has a first joint fitting hole 3a and a second joint fitting hole 3b, respectively, of the uppermost stepped dish-shaped wave plate 2. While being formed in a shape corresponding to the first through hole 2a and the second through hole 2b, the third joint fitting hole 3c and the fourth joint fitting hole 3d are respectively the uppermost stepped dish. The corrugated plate 2 is formed in a shape corresponding to the third through hole 2c and the fourth through hole 2d.

Further, the first joint 5 is fitted in the first joint fitting hole 3a of the top plate 3 so as to communicate with the hot water passage, and the first joint 5 is fitted in the second joint fitting hole 3b. The second joint 6 is fitted in such a manner as to communicate with the hot water passage. Further, the third joint 7 is fitted in the third joint fitting hole 3c so as to communicate with the cold water passage, and the fourth joint 8 is fitted in the cold water passage in the fourth joint fitting hole 3d. It is fitted so as to communicate.

By the way, the fourth joint 8 has a cylindrical male screw portion 8d, as shown in FIG.
A top plate fitting portion 8c is formed on the lower side of d. Furthermore,
A spacer fitting portion 8a is formed below the top plate fitting portion 8c, and a plate fitting portion 8b is formed below the spacer fitting portion 8a. Here, the plate fitting portion 8b
And the top plate fitting portion 8c are fitted to the stepped dish-shaped corrugated plate 2 and the top plate 3, respectively, and the spacer fitting portion 8a includes the top plate 3 and the uppermost stepped dish-shaped plate. A ring-shaped spacer 9 is fitted so as to fill a gap formed between the spacer 9 and the spacer 2. Further, the third joint 7 is similar to the fourth joint 8.

Furthermore, stacked stepped corrugated plates 2, a top plate 3, a bottom plate 4, first, second, third and fourth joints 5, 6, 7, 8; The spacer 9 is a completed product by being integrally joined using a brazing material such as copper brazing.

Since the plate heat exchanger 1 according to the present invention has the above-mentioned structure, the plate heat exchanger 1
When performing heat exchange using, the hot water is injected from the first joint 5 and the cold water is injected from the third joint 7.
Then, the hot water is discharged from the second joint 6 via the hot water passage, and the cold water is discharged from the fourth joint 8 via the cold water passage. At this time, the hot water and the cold water are stepped. Heat is exchanged via the heat transfer partition wall 2e of the dish-shaped wave plate 2.

At this time, the spacer 9 is fitted between the top plate 3 and the uppermost stepped corrugated plate 2, and the spacer 9 is the spacer fitting portion 8a of the fourth joint 8. Since the horizontal movement in the front-rear and left-right directions is restricted, the horizontal movement of the spacer 9 does not hinder the cold water passage or hinder the sealing function. This also applies to the third joint 7.

Further, as described above, the two vertically adjacent stepped corrugated plate-shaped corrugated plates 2 maintain a high degree of close contact, so that communication between the cold water passage and the hot water passage, cold water or heat It is possible to prevent external leakage of water.

In the above embodiment, the case where the first joint 5 is used as the hot water inlet and the third joint 7 is used as the cold water inlet has been described, but conversely, the first joint is used. 5
May be used as the cold water inlet, and the third joint 7 may be used as the hot water inlet.

[0021]

As described above, according to the present invention,
A corrugated heat transfer partition, first and second through holes formed in the upper surface so as to be opposed to each other with the heat transfer partition interposed, and a lower surface so as to be opposed to each other with the heat transfer partition interposed. Stepped dish-shaped wavy shape having a third and a fourth through hole formed in the upper surface, an outer peripheral rising piece continuous with the upper surface, and an outer peripheral rising piece continuous with the lower surface. A plurality of plates are stacked one above the other so that the lower surface of the upper stepped corrugated plate and the upper surface of the lower stepped corrugated plate contact each other. A plate heat exchanger in which two medium passages are alternately formed by fixing them together,
The bending radius of the outer peripheral rising piece continuously provided on the lower surface of each stepped dish-shaped plate is calculated from the bending radius of the outer peripheral rising piece continuously provided on the upper surface of the stepped dish-shaped plate. Since it is made small, two adjacent plate-shaped corrugated plates that are vertically adjacent maintain a high degree of close contact, which prevents communication between the cold water passage and the hot water passage and external leakage of cold water or hot water. It is possible to prevent it in advance.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a plate heat exchanger according to the present invention.

FIG. 2 is an exploded perspective view of the plate heat exchanger shown in FIG.

FIG. 3 is a view showing a stepped plate-shaped corrugated plate,
(A) is the top view, (b) is the front view, (c) is the side view.

4 is a vertical cross-sectional view showing the vicinity of the joint of the plate heat exchanger shown in FIG.

5 is an enlarged cross-sectional view showing a fitted state of the spacer shown in FIG.

FIG. 6 is an enlarged cross-sectional view showing a fitted state of the stepped dish-shaped corrugated plates shown in FIG.

[Explanation of symbols]

 1 ... Plate heat exchanger 2 ... Stepped plate-shaped wave plate 2a ... First through hole 2b ... Second through hole 2c ... Third through hole 2d ... Fourth through hole 2e ... Heat transfer partition 2f ... Upper surface 2g ... Lower surface 2h, 2i ... Outer peripheral rising piece R1, R2 ... Bending radius of outer peripheral rising piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoshi Kanai 16 Tokyo Forming Co., Ltd., 763 Yasaka, Hakari-cho, Ashikaga City, Tochigi Prefecture

Claims (1)

[Claims] 1. A corrugated heat transfer partition wall and first and second heat transfer partition walls formed on the upper surface so as to face each other with the heat transfer partition wall interposed therebetween.
Through holes, third and fourth through holes formed on the lower surface so as to face each other across the heat transfer partition wall, outer peripheral rising pieces connected to the upper surface, and the lower surface. A plurality of stepped dish-shaped corrugated plates each having an outer peripheral rising piece continuously connected to the lower stepped plate, the lower stepped surface of the upper stepped dished corrugated plate and the upper stepped surface of the lower stepped dish-shaped corrugated plate Is a plate-type heat exchanger in which upper and lower layers are stacked so that and come into contact with each other, and these plate-shaped corrugated plate plates are fixed to each other to alternately form two systems of medium passages. It is characterized in that the bending radius of the outer peripheral rising piece connected to the lower surface of the plate is made smaller than the bending radius of the outer peripheral rising piece connected to the upper surface of the stepped corrugated plate. Plate heat exchanger.