JPH0674672A - Plate heat exchanger - Google Patents

Abstract

PURPOSE:To simplify brazing structure by forming a connection limb integrally with the peripheral edge of at least one side of frame and brazing a limb, which is formed by bending the peripheral edge of the plate substantially in the shape of L when brazing a laminated body of the plate with a first frame and a second frame, with the connection limb. CONSTITUTION:Two kinds of plates 21 and 21' are alternately laminated by a specified number. A first flow passage A and a second flow passage B are alternately formed between each of the plates 21 and 21'. The adjacent plates 21 and 21 are connected with each other by means of brazing R around limbs which are bent in the shape of L on the peripheral edge and opening 23 and 23' which form outlet holes. As a connection limb 29, which is formed along the limb 24 at the peripheral edge of the plate 21, is integrally formed on the peripheral edge of the first frame 26, when the first frame 26 is brazed with the plate 21 on the uppermost stage, the first frame connection limb 29 allows each limb of the limbs 24 and 24' to be brazed continuously and welded with coupling strength to a satisfactory extent. This effect can apply to a second frame 27 in a similar manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate heat exchanger, and more particularly to a plate heat exchanger in which a large number of laminated plates are joined together by brazing.

[0002]

2. Description of the Related Art Generally, a plate heat exchanger has a plurality of plates having corrugated plate-shaped heat transfer surfaces and having openings at four corners, which are alternately laminated via gaskets. The first flow path and the second flow path are alternately formed between them to perform heat exchange between the working fluids.

Further, in the plate type heat exchanger (1), as shown in FIGS. 3 and 4, there are two types of plates (2).
(2 ') is laminated alternately a predetermined number of sheets, between each plate,
A rim (3) in which the first flow path (A) and the second flow path (B) are alternately formed, and adjacent plates (2) and (2 ') are bent into a substantially L-shape at their peripheral portions. (3 ') and the openings (4) and (4') forming the introduction holes for the first fluid or the second fluid are permanently joined by brazing (R) around the openings to seal the flow paths. There are things I tried to do.

In the figure, (5) and (5 ') are corrugated plate-shaped heat transfer surfaces formed in the central portions of the plates (2) and (2').

Further, this type of plate heat exchanger (1)
Is a plate (2) (2 ') that has been joined by brazing (R)
The first and second frames (7) and (8) are permanently joined by brazing (R) to the upper and lower surfaces of the laminated body (6) in the figure, and the first frame (7) has an opening. (4) First to fourth nozzles (9a) (9b) (9c) (9d) communicating with (4 ') are attached.

From the first nozzle (9a) to the first flow path
While supplying the first fluid to (A), the second nozzle (9b)
Supply the second fluid from the second channel (B) to the plate (2)
Heat is exchanged between the first flow channel (A) and the second flow channel (B) via (2 ′), and then the first fluid in the first flow channel (A) is changed to the first flow channel. Three
Discharged from the nozzle (9c) of the
The fluid is discharged from the fourth nozzle (9d) to the outside of the device.

[0007]

As described above, the gasket is used to secure the liquid tightness between the first flow path (A) and the second flow path (B) of the plate heat exchanger (1). Instead, if each plate (2) (2 ') is joined and integrated by brazing (R), the flow path formed between each plate (2) (2') will have high temperature and high pressure. When flowing a fluid or a liquid that is extremely corrosive to the gasket, the life of the plate heat exchanger can be extended as compared with the plate heat exchanger of the type using a gasket.

However, when the plate type heat exchanger (1) is formed by the above method, when the high pressure medium is flown into the first or second flow paths (A) and (B), the load of medium pressure is
(2) The load is applied to the first and second frames (7) and (8) located on both sides of the laminated body (6) made of (2 '), and this load is applied to the first frame.
And it will be supported by the outer peripheral brazing part of the second frame (7) (8).

Therefore, conventionally, as a means for increasing the brazing area of this portion and further improving the pressure resistance, as shown in FIG. 5, the first frame (7) and the first frame (7) ) And the adjacent plate (2), a coupling spacer (10) is interposed.

The spacer (10) includes a flat plate portion (11) which is in surface contact with the first frame (7), openings (12) for nozzle penetration provided at four corners of the flat plate portion (11), and a peripheral edge portion. And a rim (13) provided on the plate (2), and the rim (13) is arranged along the rim (3) at the periphery of the plate (2).

When the first frame (7) and the plate (2) are brazed, the spacer (10) is interposed between the first frame (7) and the plate (2) so that the spacer (10) The flat plate part (11) and the flat plate part (7a) of the first frame (7) are brazed (R), and the rim (13) of the spacer (10) and the rim (3) of the plate (2) are brazed. By (R), the first frame (7) and plate (2)
The area of brazing between the two is increased, and the strength of the outer peripheral portion of the plate (2) is increased and the bonding strength between the two is increased.

However, if the spacer (10) is interposed between the first frame (7) and the plate (2), the first and second frames (7) and (8) and the plate (2) ( There was a problem that a spacer (10) had to be prepared in addition to 2 '), which increased the number of parts and increased costs.

In addition, in order to interpose the spacer (10) between the first frame (7) and the plate (2), it is necessary to perform brazing after accurately positioning the above three members. However, since this positioning is extremely difficult, there is a problem that the productivity of the plate heat exchanger (1) is significantly reduced if the above method is adopted.

The outer peripheral portion of the second frame (8) is a rim.
It is processed according to the bent part of (3 ') and the outer peripheral part of the second frame (8) and the rim (3') are brazed and joined to increase the bonding strength of both, but if this is done , The second frame (8)
There was also a problem that the processing cost of was increased.

[0015]

Means for Solving the Problems Two kinds of plates having openings at four corners are alternately laminated to form first flow paths and second flow paths alternately between the plates, and adjacent plates are adjacent to each other. Are permanently joined together by brazing or the like around the periphery of the opening and the openings communicating with the respective flow paths, and the laminated body of the plates is sandwiched between the first frame and the second frame. In a plate heat exchanger in which both sides of the laminated body are brazed to the first and second frames to form an integral structure,

The plate is formed by bending the peripheral edge of the plate into a substantially L shape on the peripheral edge of at least one of the first frame and the second frame arranged on the lower surface of the upper surface of the laminated body of the plates. A rim for joining along with the rim is integrally formed,

Plate stack, first frame and second
When brazing to the frame, the rim and the coupling rim are brazed together.

Further, a connecting rim is integrally formed on the peripheral portion of the second frame along the rim formed by bending the peripheral portion of the plate into an L-shape, and the plate laminated body and the second frame are connected together. At the time of mounting, the rim and the coupling rim are brazed.

[0019]

As described above, by integrally forming the coupling rim on the peripheral portions of the first frame and the second frame, the spacer is not interposed between the first frame and the plate, and It is possible to secure a sufficient brazing area at the time of brazing the both without processing the peripheral edge portion in accordance with the peripheral rim of the plate.

[0020]

1 and 2 show an embodiment of a plate heat exchanger (20) according to the present invention.

The two types of plates (21) (21 ') used in the plate heat exchanger (20) shown in this figure are as shown in FIG.
An opening (23) having a corrugated plate-shaped heat transfer surface (22) (22 ') in the center and forming inlet holes for the first fluid or the second fluid at its four corners.
It has (23 ').

Further, the peripheral portions of the two types of plates (21) and (21 ') are bent in a substantially L shape to form rims (24) and (24').

Then, a predetermined number of these two kinds of plates (21) (21 ') are alternately laminated, and between the plates (21) (21'),
The first flow path (A) and the second flow path (B) are alternately formed, and in this state, the adjacent plates (21) and (21 ') are bent into a substantially L-shape at the peripheral edge thereof. Rim (24) (24 ') and first flow path (A)
Alternatively, an opening that forms an inlet hole and an outlet hole of the second flow path (B)
(23) Permanently joining by brazing (R) around (23 '), each channel is sealed.

(26) (27) are the two types of plates (21) (2)
Laminate (25) formed by laminating and integrating 1 ')
2 is a first frame and a second frame arranged on the upper and lower surfaces in FIG.

The first frame (26) is in the shape of a flat plate whose center contacts the heat transfer surface (22) of the plate (21), and the four corners of the plate (21) (21 ') have four corners. First to fourth nozzles (28a) (28b) (28c) (28d) communicating with the openings (23) (23 ') provided in the corners are provided, and further, the plate (21) is provided at the peripheral portion. A rim (29) for coupling which is bent into a substantially L shape is formed along the rim (24) formed at the peripheral edge of the.

Further, the first to fourth nozzles (28a) (28)
b) (28c) (28d) and the coupling rim (29) are the first frame (26)
At the time of forming, it is formed integrally by pressing.

Further, the second frame (27) has a flat plate shape whose central portion is in contact with the heat transfer surface (22 ') of the plate (21'), and its peripheral portion is the peripheral portion of the plate (21 '). A coupling rim (30) bent in a substantially L shape is formed along the rim (24 ') formed in the above.

In order to form the plate heat exchanger (20) according to the present invention having the above structure, a predetermined number of two kinds of plates (21) (21 ') are formed on the second frame (27). The first flow path (A) and the second flow path (B) are alternately formed between the plates (21) and (21 ′), and the first frame (26) is stacked thereon.

At this time, the first and second frames 26, 27,
Further, since the rims (29) (30) and the rims (24) (24 ') for bending which are formed in a substantially L shape are formed on the peripheral edge of each plate (21) (21'). Since the rims act as positioning guides when the members are stacked, the members can be positioned simply by stacking them.

In this state, the adjacent plates (21) (21 ')
As described above, the rims (24) and (24 ') bent in a substantially L shape around the peripheral portions thereof, and the first flow path (A) or the second flow path.
(B) Permanently joins around the openings (23) and (23 ') forming the introduction hole and the discharge hole by brazing (R) to seal each flow path, and at the same time, the second frame (27) And braze (R) the plate (21 ') located at the bottom in the figure to the first frame (2
6) and the plate (21) located at the top of the figure are brazed
(R), and further, the first and third nozzles (28a) (28c) of the first frame (26) and the openings (23) (23) of the plate (21),
Brazing (R) is performed around it to form a plate heat exchanger (20).

The plate heat exchanger (20) as described above
If the edge of the first frame (26) is
(21) Since the coupling rim (29) along the rim (24) at the peripheral portion is integrally formed, the first frame (26) and the uppermost plate
When the (21) and are brazed, the connecting rim (2
In 9), the rims (24) and (24 ') are continuously brazed and brazed to the strongest peripheral portion, so that both can be joined with a sufficient bonding strength.

This effect is the same for the second frame (27).

Further, at the four corners of the first frame (26), the first to fourth nozzles (communicating with the openings (23) and (23 ') provided at the four corners of the plates (21) and (21') ( Since 28a) (28b) (28c) (28d) are formed by integral molding, it is not necessary to braze the first frame (26) and each nozzle (28a) (28b) (28c) (28d). .

[0034]

As described above, in the plate heat exchanger according to the present invention, the coupling rim is integrally formed on the peripheral portion of the first frame, and when the plate laminate and the first frame are brazed, Since it is possible to secure a sufficient brazing area when brazing the first frame and the plate without interposing a spacer between them, the number of parts when forming a plate heat exchanger of this type is reduced. Can be made.

Further, when the laminated body of the plates and the first frame are laminated, the rims provided on the outer circumferences of the both and the coupling rim act as positioning guides during the lamination, so that the positioning work for brazing the both Becomes very easy.

Furthermore, since the first frame is provided with the first to fourth nozzles which are in communication with the respective openings formed in the plate, the nozzles need not be attached to the first frame.

Due to the synergistic effect of the above three factors, the cost of the brazed plate type heat exchanger can be greatly reduced.

[Brief description of drawings]

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

2 (a) and 2 (b) are plan views of plates constituting a plate heat exchanger.

FIG. 3 is a schematic sectional view showing a conventional example of a plate heat exchanger.

4 (a) and 4 (b) are plan views of plates constituting the plate heat exchanger.

FIG. 5 is a schematic sectional view showing another conventional example of a plate heat exchanger.

[Explanation of symbols]

 A 1st flow path B 2nd flow path 20 Plate type heat exchanger 21 Plate 21 'Plate 23 Opening 23' Opening 24 Rim 24 'Rim 25 Laminated body 26 1st frame 27 2nd frame 28a 1st nozzle 28b 2nd Nozzle 28c Third nozzle 28d Fourth nozzle 29 Coupling rim

Claims (1)

[Claims] 1. Two types of plates having openings at four corners are alternately laminated to alternately form a first flow path and a second flow path between each plate, and adjacent plates are surrounded by their peripheral edges. On the above-mentioned laminated body while the laminated body of the plate is sandwiched between the first frame and the second frame while being permanently joined together by brazing or the like around the portion and the opening communicating with each flow path. In a plate heat exchanger having a lower surface brazed to the first and second frames to form an integral structure, of the first frame and the second frame placed on the upper and lower surfaces of the stack of plates, A rim for coupling, which is formed along the rim formed by bending the peripheral edge of the plate into a substantially L shape, is integrally formed on the peripheral edge of at least one frame, and the laminated body of the plates and the first frame and the second frame When brazing with the rim above Plate heat exchanger, characterized in that the brazing and engagement rim.