JP3146298B2 - Gasket for plate heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket mounted on a heat transfer plate of a plate heat exchanger.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 5, a plate type heat exchanger comprises a heat transfer plate (3) provided with fluid passage holes (2) at four corners of a heat transfer surface (1). The required number of sheets are alternately turned upside down through a gasket (5) installed in a gasket groove (4) provided over the entire circumference of the heat transfer sheet, and a required number of sheets are stacked. The first flow path and the second flow path through which the air flows are alternately arranged.

The gasket (5) seals a gasket main body (6) for sealing the heat transfer surface (1) and predetermined fluid passage holes (2) at both end corners of one side edge of the heat transfer plate (3). The gasket main body (6) has a passage hole side gasket portion (7) and a predetermined fluid passage hole (2) and a heat transfer surface (1). The gasket portion (7) is sealed with the heat transfer surface side seal portion (9) to form a double seal portion (10), and the gasket body (6) has a passage hole side seal portion (8) and a passage hole. It is formed by integrally joining a longitudinal straight seal portion (11) located on the gasket portion side.

By the way, usually, in a plate heat exchanger, the heat transfer area (plate heat transfer area / plate material area) is improved to improve the heat transfer plate (3).
To reduce the production cost.
To improve the heat transfer area yield, the first gasket
In the conventional example shown in FIG. 6, as shown in FIG.
The gasket main body (6) constituting the gasket main body (6) is formed in a curved shape having a center of curvature on the gasket part (7) side of the gasket main body (6), and the gasket main body (6) has a gasket body side seal (8). Angle of intersection between the longitudinal seal portion (11) and
It is around 20 degrees. In the second conventional example of the gasket, as shown in FIG. 7, the passage hole side seal portion (8) of the gasket main body (6) has a linear shape, and the passage hole side seal portion (8) has a longitudinal shape. The crossing angle with the direction linear seal part (11) is about 120 degrees. In the first and second prior art gaskets, the corner (12) of the intersection (12) between the passage hole side seal (8) of the gasket body (6) and the longitudinal straight seal (11) is provided. (13)
A rounded portion having a center of curvature is formed on the heat transfer surface (1) side, and this rounded portion is formed from the production of a plate mold.

[0005]

The fluid flowing from the predetermined fluid passage hole (2) of the heat transfer plate (3) is dispersed on the heat transfer surface (1), or the fluid is transferred to the heat transfer surface (1). When the gasket is gathered from the gasket into the fluid passage hole (2), the vicinity (16) of the intersection (12) between the passage hole side seal portion (8) of the gasket main body (6) and the longitudinal linear seal portion (11), In the vicinity of the passage hole side seal portion (8), the fluid between the passage hole side seal portion (8) and the longitudinal linear seal portion (11).
Since the intersection angle inside the flow path is small, the flow of the fluid becomes poor, or the fluid stays. When the flow of the fluid becomes poor or stagnates, the intersection (1)
Scale may accumulate in the vicinity (16) or the like of 2) or the fluid may be concentrated, which may cause hygiene problems in food applications and the like, and may cause heat transfer when used in other fields. There was a problem that the plate (3) was corroded and damaged.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above problems, and it is possible to improve the flow of a fluid flowing on a heat transfer surface of a heat transfer plate and to reliably prevent the fluid from staying. It is intended to provide a gainable gasket.

[0007]

According to a first aspect of the present invention, there is provided a heat transfer plate having a gasket groove at a peripheral edge of a heat transfer plate having fluid passage holes at four corners of a heat transfer surface. The gasket main body and the passage hole gasket for sealing the heat transfer surface and the fluid passage hole, respectively, form a double seal portion, and constitute the longitudinal linear seal portion of the gasket main body portion and the double seal portion. In a gasket for a plate heat exchanger in which a gasket main body and a passage hole side seal are integrally joined at a predetermined intersection angle,

The crossing angle between the longitudinal linear seal portion of the gasket main body portion and the passage hole side seal portion inside the fluid flow path is 14
In this case, the passage hole side seal portion of the gasket body is formed of a plurality of straight portions having at least one bending point bent toward the passage hole.

A second aspect of the present invention is to provide a gasket main body which includes a longitudinally extending linear seal portion and a passage hole side seal portion inside a fluid flow path.
The crossing angle of 140 degrees or more, and the passage hole side seal portion of the gasket body portion is constituted by a straight portion and a curved portion having a center of curvature on the heat transfer surface side, and any one of the straight portion or the curved portion One is integrally joined to the longitudinal linear seal portion of the gasket main body.

A third aspect of the present invention is directed to a gasket main body section in which a longitudinal linear seal portion and a passage hole side seal portion are provided inside a fluid flow path.
Of the gasket main body is formed into a curved shape having a center of curvature on the heat transfer surface side.

[0011]

By mounting the gasket having the above structure on the heat transfer plate, the intersection angle between the passage hole side seal portion of the gasket main body portion and the longitudinal straight seal portion can be increased while suppressing a decrease in the heat transfer area yield. The flow of the fluid in the vicinity of the intersection of the two seals is improved, and the fluid can be reliably prevented from staying.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gasket for a plate heat exchanger according to the present invention will be described below with reference to FIGS. The same components as those shown in FIGS. 5 to 7 are denoted by the same reference numerals, and description thereof will be omitted.

[Example 1]

In this embodiment, as shown in FIG. 1, the crossing angle between the longitudinal linear seal portion (11) of the gasket main body (6) and the passage hole side seal portion (21) is set to 140 degrees or more.
In addition, the gasket body (6) has a passage hole side seal (2).
1) is formed by a plurality of straight portions having at least one bending point (26) bent toward the passage hole (2), and FIG. 1 is formed by a first straight portion (27) and a second straight portion (28). It was done.

As described above, the gasket main body (6) has a longitudinal linear seal (11) and a passage hole side seal (2).
1) the crossing angle with the inside of the fluid flow path is 140 degrees or more;
In addition, the gasket body (6) has a passage hole side seal (2).
1) Forming a plurality of straight portions having at least one bending point (26) bent toward the passage hole (2), for example, a first straight portion (27) and a second straight portion (28). Thereby, the intersection angle between the longitudinal direction linear seal portion (11) and the passage hole side seal portion (21) can be increased while reducing the decrease in the heat transfer area yield. Therefore, the fluid flowing from the predetermined fluid passage hole (2) of the heat transfer plate (3)
In the vicinity (16) near the intersection (12) of the two seals (21) and (11), the fluid smoothly flows along the two seals (21) and (11), and in the vicinity (16) and the like as in the related art. The flow of the fluid does not deteriorate and the fluid does not stay.

[Example 2]

In this embodiment, as shown in FIG. 2, the gasket main body (6) has a passage hole side seal portion (21) connected to a linear portion (31) and a series of the linear portion (31). And a curved portion (32) having a center of curvature on the heat transfer surface (1) side
The curved portion (32) is integrally joined to the longitudinal straight-line sealing portion (11), and the crossing angle thereof is approximately 180 degrees.

[Embodiment 3]

In this embodiment, as shown in FIG. 3, the gasket main body (6) is provided with the passage hole side seal (21) and the first and second straight portions (36) (37) and the heat transfer surface (37). 1) a curved portion (38) having a center of curvature on the side.
The straight portion (36) and the second straight portion (37) are integrally connected via the curved portion (38), and the second straight portion (3
7) is integrally joined to the longitudinal linear seal portion (11), and the intersection angle between the second linear portion (37) and the longitudinal linear seal portion (11) inside the fluid flow path is 140 degrees or more. It was done.

[Embodiment 4]

In this embodiment, as shown in FIG. 4, the passage hole side seal portion (21) of the gasket main body (6) has a curved shape having a center of curvature on the heat transfer surface (1) side. The shape of the passage hole side seal portion (21) is integrally joined to the longitudinal linear seal portion (11) so that the crossing angle thereof is approximately 180 degrees.

[0022]

According to the gasket of the present invention, the crossing angle between the passage hole side seal portion and the longitudinal straight seal portion of the gasket main body can be increased while suppressing the decrease in the heat transfer area yield. The flow of the fluid in the vicinity of the intersection between the passage hole side seal portion and the longitudinal linear seal portion becomes good, and the fluid can be reliably prevented from staying in the vicinity or the like. Therefore, the scale does not accumulate on the heat transfer surface or the fluid is not concentrated. As a result, the heat transfer plate is extremely hygienic in food applications, and in other applications, the heat transfer plate is corroded and damaged. Can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part showing a first embodiment of a gasket according to the present invention.

FIG. 2 is a main part plan view showing a second embodiment;

FIG. 3 is a main part plan view showing a third embodiment;

FIG. 4 is a main part plan view showing a fourth embodiment.

FIG. 5 is a plan view showing a heat transfer plate on which a gasket is mounted.

FIG. 6 is a main part plan view showing a first conventional example of a gasket.

FIG. 7 is an essential part plan view showing a second conventional example of a gasket.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Heat transfer surface 2 Fluid passage hole 3 Heat transfer plate 4 Gasket groove 6 Gasket main body part 7 Passage hole gasket part 10 Double seal part 11 Longitudinal linear seal part 21 Passage hole side seal part 26 Bending point 27, 28, 31, 36,37 Straight section 32,38 Curved section

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-302996 (JP, A) JP-A-4-108175 (JP, U) JP-A-3-56078 (JP, U) JP-A-1 106771 (JP, U) JP 50-40259 (JP, B2)

Claims (3)

(57) [Claims] 1. A gasket main body portion and a passage hole fixed to gasket grooves in a peripheral portion of a heat transfer plate provided with fluid passage holes at four corners of a heat transfer surface, and sealing the heat transfer surface and the fluid passage hole, respectively. Form a double seal with the gasket,
A gasket for a plate-type heat exchanger in which a longitudinal direction linear seal portion of a gasket main body and a passage hole side seal portion of a gasket main body constituting the double seal portion are integrally joined at a predetermined intersection angle. The crossing angle between the longitudinal linear seal portion and the passage hole side seal portion inside the fluid flow path is 140 degrees or more, and at least one bend in which the passage hole side seal portion of the gasket main body portion is bent toward the passage hole side. A gasket for a plate-type heat exchanger, wherein the gasket is formed by a plurality of straight portions having points. 2. A gasket body portion and a passage hole fixed to gasket grooves in a peripheral portion of a heat transfer plate having fluid passage holes provided at four corners of a heat transfer surface, and sealing the heat transfer surface and the fluid passage hole, respectively. Form a double seal with the gasket,
A gasket for a plate-type heat exchanger in which a longitudinal direction linear seal portion of a gasket main body and a passage hole side seal portion of a gasket main body constituting the double seal portion are integrally joined at a predetermined intersection angle. The crossing angle between the longitudinal straight seal portion and the passage hole side seal portion inside the fluid flow path is 140 degrees or more, and the passage hole side seal portion of the gasket main body has a center of curvature between the straight portion and the heat transfer surface side. A gasket for a plate-type heat exchanger, characterized in that either one of the linear portion or the curved portion is integrally joined to a longitudinal linear seal portion of the gasket main body portion. 3. A gasket main body and a passage hole fixed to gasket grooves in a peripheral portion of a heat transfer plate provided with fluid passage holes at four corners of a heat transfer surface, and sealing the heat transfer surface and the fluid passage hole, respectively. Form a double seal with the gasket,
A gasket for a plate-type heat exchanger in which a longitudinal direction linear seal portion of a gasket main body and a passage hole side seal portion of a gasket main body constituting the double seal portion are integrally joined at a predetermined intersection angle. A cross-sectional angle between the longitudinal straight seal portion and the passage hole side seal portion on the inner side of the fluid flow path is 140 degrees or more, and the passage hole side seal portion of the gasket main body has a curved shape having a center of curvature on the heat transfer surface side. A gasket for a plate-type heat exchanger, characterized in that: