JPH06281382A - Plate type heat exchanger - Google Patents

Abstract

PURPOSE:To provide a plate type heat exchanger in which a gasket mounting operation and a removing operation at the time of replacing can be simply conducted. CONSTITUTION:A fixing piece 16 of a gasket 15 is formed substantially in a square-shaped section, its lateral side (a) is formed larger than a lateral size (c) of an inlet narrow part of a recess 14 of a plate 11, a height size L is also formed larger than a depth size (h) of a recess 14 of the plate 11, and the piece 16 is locally contracted fixedly at the inlet narrow part of the recess 14 of the plate 11.

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 in which a required number of plates are laminated with a gasket interposed therebetween.

[0002]

2. Description of the Related Art Generally, a plate heat exchanger is one in which a required number of plates each having a heat transfer surface on which various patterns of concavities and convexities are formed are laminated through a gasket, and a plurality of medium passages are formed between the plates. . Then, different heat exchange media to be heat-exchanged are alternately circulated in the medium passage, and heat is exchanged between the two heat exchange media via the plate.

In such a plate heat exchanger, for example, a plate (1) as shown in FIG. 5 is used. This plate (1) has a heat transfer surface (2) formed in the center thereof with various concavo-convex patterns (not shown) for improving heat transfer performance and increasing the contact area with the heat exchange medium. In addition, passage holes (3), (4), (5) and (6) serving as inlets and outlets for the heat exchange medium are provided at the four corners, respectively. Further, in the plate (1), a gasket groove (7) having an inverted trapezoidal shape is formed in a portion surrounding the periphery of the heat transfer surface (2) and the periphery of each passage hole (3) (4) (5) (6). ) Is formed, and the heat transfer surface (2) is formed in the gasket groove (7).
Also, a gasket (8) is attached so as to communicate the pair of upper and lower passage holes (4) and (6) and to block the other pair of upper and lower passage holes (3) and (5).

By the way, when the gasket (8) is mounted in the gasket groove (7) of the plate (1), when the gasket (8) is fixed to the plate (1) with an adhesive, it is bonded to the gasket groove (8). Since the agent must be applied, the work of attaching the gasket (7) to the plate (1) becomes extremely complicated, and the gasket (8) is removed from the plate (1) when the gasket (8) is replaced. It is difficult to replace the gasket, and it takes time to replace the gasket, resulting in poor workability. In addition, when heat exchange is performed on a medium for food or medicine, there is a disadvantage that mixing of an adhesive becomes a problem. Therefore, it is desired to fix the gasket (8) to the plate (1) without using an adhesive.

Therefore, the applicant of the present invention has filed in Japanese Patent Application No. 1-34.
No. 883 [Actual Publication No. 2-127960] proposes a plate heat exchanger in which the gasket (8) is not fixed to the plate (1) with an adhesive. As shown in FIG. 6 and FIG. 7, this plate heat exchanger has a fixed piece (9) having a trapezoidal cross section formed on the outer peripheral side surface of the gasket (8) at a constant pitch, and at the same time, the plate (1) is formed. Outside the gasket groove (7) of No. 3, a trapezoidal recess (10) corresponding to the fixing piece (9) of the gasket (8) is formed at a constant pitch and communicates with the gasket groove (7). The gasket (8) is formed, and the gasket (8) is fitted in the gasket groove (7), and at the same time, the fixing piece (9) is press-fitted into the recess (10) to fit the gasket (8) to the plate (1). It was fixed.

[0006]

In the conventional plate type heat exchanger described above, the fixing piece (9) of the gasket (8) having a trapezoidal cross section has the plate (1) having substantially the same cross sectional shape. The fixing piece (9) is securely held by the dovetail fitting in the recessed portion (10) by press-fitting and fitting into the recessed portion (10) and the fixing piece (9) is fixed to the inner surface of the recessed portion (10). The compression reaction force of is applied to obtain a very strong fixing force. However, since a large force is required to press-fit the fixing piece (9) having a trapezoidal cross section into the recess (10) having substantially the same trapezoidal shape, the fixing piece (9) to the recess (10) is A great deal of labor and time is required for the press-fitting work of the fixing piece (9), and the workability becomes extremely poor.
When the fixing piece (9) is press-fitted into the recess (10), there is a problem that the recess (10) of the plate (1) is permanently deformed by a large force. Moreover, since the fixing force of the fixing piece (9) is very strong, there is a problem that the fixing piece (9) is cut when the gasket (8) is removed from the plate (1) when the gasket is replaced. .

Further, when the plates (1) having different plate thicknesses are formed by pressing with the same plate molding die, the concave portions (10) of the plate (1) are formed in different shapes due to the plate thickness difference. It is necessary to press-fit the fixing piece (9) of the gasket (8) into the recessed portion (10) of the plate (1) having any plate thickness with an appropriate degree of fitting so that the plate thickness difference of the plate (1) is different. It is difficult due to the difference in shape of the recessed part (10) due to, and when the fitting degree of the fixing piece (9) is loose, the gasket (8)
However, when the degree of fitting of the fixing piece (9) is large, press-fitting work and removal work of the fixing piece (9) are troublesome and workability is poor.

Further, when viewed from the manufacturing side of the gasket (8), since the fixing piece (9) has a trapezoidal cross section, it is necessary to form a portion corresponding to the fixing piece (9) of the gasket molding die in a trapezoidal shape. This causes a problem that the shape processing of the gasket molding die becomes difficult and the die cost becomes high, and the fixing piece (9) does not easily come off from the die even when detached from the die after molding. As a result, the fixing piece (9) is damaged and the yield is poor, and the gasket (8)
However, there is a problem that the cost becomes high.

Therefore, an object of the present invention is to provide a plate heat exchanger capable of solving the above problems.

[0010]

In order to achieve the above object, the present invention forms a trapezoidal recess in the outer side of a gasket groove of a plate or in a double seal portion in communication with the gasket groove, and , A fixing piece is formed on the outer peripheral side surface of the gasket or the double seal portion so as to correspond to the recessed portion of the plate, and the fixing piece of the gasket is press-fitted into the recessed portion of the plate to insert into the gasket groove of the plate. In the plate heat exchanger for fixing the gasket, the fixing piece of the gasket is formed in a substantially rectangular cross section, and the width dimension thereof is made larger than the width dimension of the inlet narrowed portion of the recessed portion of the plate, and the height dimension is also set. Also, the depth dimension of the recessed portion of the plate is equal to or larger than the depth dimension.

[0011]

According to the present invention, the fixing piece of the gasket is formed in a substantially quadrangular cross section, and the width dimension thereof is made larger than the width dimension of the inlet narrowed portion of the recessed portion of the plate, and the height dimension of the plate is also set. Since the depth of the recess is set to be equal to or larger than the depth dimension, when the fixing piece of the gasket is press-fitted into the recess of the plate, the fixing piece of the gasket is locally compressed and fixed at the inlet narrowed portion of the recess of the plate. As a result, a large force is not required to press the gasket fixing piece into the recess of the plate, and the gasket fixing piece can be easily press-fitted and removed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS.

In FIG. 1 to FIG. 4, (11) is a heat transfer in which various concave and convex patterns (not shown) are formed in the central part thereof for improving heat transfer performance and increasing the contact area with the heat exchange medium. In the plate having the surface (12), an inverted trapezoidal shape is formed in the portion surrounding the heat transfer surface (12) and the passage holes (not shown) that are formed at the four corners and serve as inlets and outlets for the heat exchange medium. A gasket groove (13) having a groove is formed, and a trapezoidal recess (14) is formed outside the gasket groove (13) at a constant pitch and in communication with the gasket groove (13). . (15) is a gasket made of an elastic material having heat resistance such as synthetic rubber,
The gasket groove (13) of 1) is formed so that the heat transfer surface (12) and the pair of upper and lower passage holes are communicated with each other and the other pair of upper and lower passage holes are blocked. There is. On the outer peripheral side surface of the gasket (15), a fixing piece (16) is formed at a constant pitch so as to correspond to the recessed portion (14) formed outside the gasket groove (13) of the plate (11). By pressing the fixing piece (16) into the recess (14) formed outside the gasket groove (13) of the plate (11), the gasket (15) is inserted into the gasket groove (13) of the plate (11). It is fixed to. The fixing piece (16) of the gasket (15) is formed in a quadrangular cross section, and the width dimension (a) thereof is larger than the width dimension (c) of the inlet narrowed portion of the recess (14) of the plate (11). The height dimension (L) is set larger than the depth dimension (h) of the recess (14). This allows the fixing piece (1
When 6) is press-fitted into the recess (14) formed on the outside of the gasket groove (13) of the plate (11), the fixing piece (16) is locally compressed and fixed at the inlet constriction of the recess (14). It

Further, a gasket groove (1
The recessed part (14) is also formed on the double seal part other than the outside of (3), and the recessed part (14) is integrally formed with the double seal part of the gasket (15) so as to project integrally with the recessed part (14). By press-fitting the piece (16), the gasket (15) is securely fixed in the gasket groove (13) of the plate (11).

As described above, in the plate heat exchanger of the present invention, the fixing piece (16) of the gasket (15) is formed in a rectangular cross section so that the inlet narrowed portion of the recess (14) of the plate (11). Since it is locally compressed and fixed, the fixing piece (16) of the gasket (15) and the plate (1
Even if the compression allowance of the recessed portion (14) and the inlet constriction of (1) is increased, the fixing piece (16) of the gasket (15) is attached to the plate (1).
When press-fitting into the recessed part (14) of 1), a large force is not required unlike the conventional case. Therefore, the fixing piece (16) of the gasket (15) can be more easily press-fitted and withdrawn than the conventional one, and the mounting work of the gasket (15) and the removing work such as replacement can be performed very easily, and at the same time, the plate (11) It is possible to reduce the deformation of the recessed portion (10) and the damage to the gasket (15). Moreover, even if the recessed portion (14) of the plate (11) is press-molded by the same plate molding die to have different shapes due to the difference in the plate thickness of the plate (11), the fixing piece ( 16) and plate (1
Since the compression allowance between the recessed portion (14) and the inlet constricted portion of 1) is large, the fixing piece (16) of the gasket (15) can be press-fitted with an appropriate degree of fitting. In addition, since the fixing piece (16) is formed in a rectangular cross-section on the manufacturing surface of the gasket (15), the gasket molding die can be easily shaped and the die cost can be reduced. Even when it is removed from the mold, the fixing piece (16) is easily removed from the mold and is not damaged, the yield is improved, and the gasket (15) can be made inexpensive.

The above embodiment shows the case where the fixing piece (16) of the gasket (15) is formed in a rectangular cross section.
Even with this, the recess (14) of the plate (11) of the fixing piece (16)
Although it is easy to press fit into the plate, as shown in FIG. 4 or FIG. 5, the lower part of the fixing piece (16) is rounded or chamfered, so that the recessed part () of the plate (11) of the fixing piece (16) ( It can be easily pressed into 14).

[0017]

As described above, the gasket fixing piece press-fitted into the trapezoidal concave portion formed on the outer side of the gasket of the plate or the double seal portion is formed into a substantially rectangular cross section, and Since it is locally compressed and fixed at the inlet constriction of the recess, a large force is not required to press the gasket fixing piece into the plate recess, making it easy to press and remove the fixing piece. The gasket can be easily installed and removed at the time of replacement, and at the same time deformation of the plate recess and damage to the gasket can be reduced, and even if there is a difference in the shape of the plate recess, it is appropriate. The fixing piece can be press-fitted depending on the degree of fitting. Also in terms of gasket manufacturing, it is easy to shape the gasket mold,
The remarkable effect is that the yield is improved and the gasket can be manufactured at a low cost.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an essential part of a plate heat exchanger of the present invention.

FIG. 2 is an exploded perspective view of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a vertical sectional view of a fixing piece, showing a modification of the fixing piece of the gasket.

FIG. 5 is a longitudinal sectional view of a fixing piece, showing another modification of the fixing piece of the gasket.

FIG. 6 is a schematic front view showing an example of a plate of a plate heat exchanger.

FIG. 7 is a partial perspective view of a main part of a conventional plate heat exchanger.

FIG. 8 is an exploded perspective view of FIG. 7.

9 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

 11 Plate 12 Heat transfer surface 13 Gasket groove 14 Recessed portion 15 Gasket 16 Fixing piece a Width dimension of fixed piece c Width dimension of inlet narrowed portion of recessed portion L Height dimension of fixed piece h Depth dimension of recessed portion

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[Procedure amendment]

[Submission date] April 2, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

As described above, in the plate heat exchanger of the present invention, the fixing piece (16) of the gasket (15) is formed in a rectangular cross section so that the inlet narrowed portion of the recess (14) of the plate (11). Since it is locally compressed and fixed, the fixing piece (16) of the gasket (15) and the plate (1
Even if the compression allowance of the recessed portion (14) and the inlet constriction of (1) is increased, the fixing piece (16) of the gasket (15) is attached to the plate (1).
When press-fitting into the recessed part (14) of 1), a large force is not required unlike the conventional case. Therefore, the fixing piece (16) of the gasket (15) can be more easily press-fitted and withdrawn than the conventional one, and the mounting work of the gasket (15) and the removing work such as replacement can be performed very easily, and at the same time, the plate (11) It is possible to reduce the deformation of the recessed portion (14) and the damage to the gasket (15). Moreover, even if the recessed portion (14) of the plate (11) is press-molded by the same plate molding die to have different shapes due to the difference in the plate thickness of the plate (11), the fixing piece ( 16) and plate (1
Since the compression allowance between the recessed portion (14) and the inlet constricted portion of 1) is large, the fixing piece (16) of the gasket (15) can be press-fitted with an appropriate degree of fitting. In addition, since the fixing piece (16) is formed in a rectangular cross-section on the manufacturing surface of the gasket (15), the gasket molding die can be easily shaped and the die cost can be reduced. Even when it is removed from the mold, the fixing piece (16) is easily removed from the mold and is not damaged, the yield is improved, and the gasket (15) can be made inexpensive.

Claims (1)

[Claims] 1. A plate having a trapezoidal recess is formed outside the gasket groove of the plate or in the double seal portion so as to communicate with the gasket groove, and the plate is formed on the outer peripheral surface of the gasket or the double seal portion. In the plate heat exchanger in which the fixing piece is formed to project corresponding to the concave portion of the plate, and the fixing piece of the gasket is pressed into the concave portion of the plate to fix the gasket in the gasket groove of the plate. The fixing piece is formed in a substantially rectangular cross section,
A plate heat exchanger characterized in that its width dimension is made larger than the width dimension of the inlet constriction portion of the recessed portion of the plate, and the height dimension thereof is equal to or larger than the depth dimension of the recessed portion of the plate. .