JP3345080B2 - 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 without using an adhesive.

[0002]

2. Description of the Related Art In general, a plate heat exchanger has a rectangular shape having fluid passage holes (2) (2 ') at four corners of a heat transfer surface (1) (1') as shown in FIGS. Heat transfer plates (3) and (3 ')
The first flow path (6) which is laminated via the gaskets (5) (5 ') fitted in the gasket grooves (4) (4') on the peripheral edge of (3 ') and through which different types of heat medium flow. ) And the second flow path (7)
And are alternately arranged. In addition, heat transfer plate (3)
Since the gaskets (5) and (5 ') attached to (3') have the same configuration, only the gasket (5) attached to the heat transfer plate (3) will be described below. Regarding the gasket (5 ') attached to 3'), a dash is attached to the reference numeral, and the description is omitted.

The gasket (5) does not use an adhesive in the gasket groove (4) of the heat transfer plate (3), and a locking piece (not shown) provided at an appropriate position is provided outside the heat transfer plate. It is fitted and fixed by being locked to a locking portion (not shown) formed on the peripheral edge. The fluid flow path (6) of the heat transfer plate (3) is sealed by the gasket main body (8), and has a predetermined fluid passage hole (1) at both ends of one side edge of the heat transfer plate (3). 2) is sealed with a circular passage hole gasket portion (9), and a passage hole of a gasket main body portion (8) is provided between a predetermined fluid passage hole (2) and the first flow passage (6). A double seal structure is formed by the side seal part (10) and the flow path side seal part (11) of the passage hole gasket part (9), and between the passage hole side seal part (10) and the flow path side seal part (11). In addition, an air opening space (12) open to the atmosphere is formed respectively, and on both sides of the air opening space (12), a passage hole side seal portion (10) of a gasket main body (8) and a passage hole gasket. As shown in FIG. 7, both sides of the portion (9) are formed with a concave leakage fluid discharge hole (13) at a substantially middle portion. The open space seal portions (14) (14) of the linear shape are integrally connected. Further, the passage-side seal portion (11) of the passage hole gasket portion (9) and the substantially central portion of the passage hole side seal portion (10) of the gasket body (8) are connected by a connection portion (15). The seal portion (10) of the gasket body (8) on the passage hole side is fixed to the heat transfer plate (3) by the connecting portion (15).

In addition, Japanese Utility Model Application Laid-Open No. 2-127960 proposed by the present applicant.
In the publication, as shown in FIG. 8, a gasket fixing groove (16) having a trapezoidal cross section opening in a gasket groove (4) is formed in a part of the outer peripheral edge of a heat transfer plate (3). A fixing piece (17) having a trapezoidal cross section to be press-fitted into the gasket fixing groove (16) is integrally protruded from a part of (5), and the fixing piece (17) is inserted into the gasket fixing groove (16). It describes that a gasket (5) is attached to a heat transfer plate (3) by press fitting.

[0005]

The conventional gasket (5) shown in FIGS. 5 to 7 is mainly made of synthetic rubber. When a high-temperature fluid flows through the fluid flow path (7) on the back surface of the heat plate (3), the connecting portion (15) undergoes thermal contraction under the influence of the high-temperature fluid, and at the same time, has a circular passage hole gasket portion (9). Thermally shrinks and moves toward its center. Therefore, the heat shrinkage amounts of the connecting portion (15) and the passage hole gasket portion (9) are summed up, so that the passage hole side seal portion (10) of the gasket main body (8) becomes the passage hole gasket portion (9). The gasket groove (4) is greatly pulled to the side
, Or it comes off the gasket groove (4),
The sealing performance decreases. Moreover, when the heat transfer plate (3) is tightened in a detached state, there is a problem that the heat transfer plate (3) and the gasket (5) are damaged.

Further, according to Japanese Utility Model Laid-Open No. 2-127960 shown in FIG. 8, a fixing piece (17) protruding from a gasket (5) must be processed into a trapezoidal cross section.
For this reason, when manufacturing the gasket (5), since the fixing piece (17) is difficult to remove from the gasket mold, the fixing piece (17) is cut from the gasket (5) when removing the gasket (5) from the gasket mold. As a result, the yield of products is extremely deteriorated, the workability in manufacturing the gasket is deteriorated, and the production cost of the gasket (5) increases. In addition, when the gasket (5) is attached to the heat transfer plate (3), the fixing piece (17) is press-fitted into the gasket groove (4) of the heat transfer plate (3), so that there is a problem that it takes time to press-fit. Was.

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and has been developed in view of the flow of a gasket main body constituting a double seal structure.
It is an object of the present invention to provide a gasket that can securely fix a road hole side seal portion to a heat transfer plate without using an adhesive, has good sealing performance, and is easy to mount.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a gasket groove at a peripheral edge of a heat transfer plate having fluid passage holes at four corners of a heat transfer surface forming a fluid flow path. It is fitted in a fixed manner and seals the fluid flow path.
Of the gasket body and the heat transfer plate
With a passage hole gasket that seals a predetermined fluid passage hole
And between the fluid flow path and a predetermined fluid passage hole.
The gasket main body passage hole side seal and passage hole gas
If a double seal structure is used with the flow path side seal part of the
In both cases , the gasket body and the passage hole gasket are
Open space seal portion of the linear shape having a concave leakage fluid discharge hole that is disposed in the air open space portion formed between the flow path side seal portion of the passage hole sealing section and the passage hole gasket portion of the gasket main body portion In the gasket connected by
The gasket main body portion has a passage hole side seal portion and an open space seal portion integrally connected by a connection portion having a predetermined thickness.

[0009]

According to the present invention, the gasket, that is, the gasket main body, the passage hole gasket, and the linear open space seal connecting the gasket main body and the passage hole gasket are locked in place to the heat transfer plate. Since it is fixed, even if a high-temperature fluid flows through the fluid flow path and is affected by the heat, the linear open space seal portion does not move due to thermal contraction. Therefore, the heat shrinkage amount is only at the connection portion connecting the open space seal portion and the passage hole side seal portion of the gasket main body portion, and the heat shrinkage between the connection portion of the conventional gasket and the passage hole gasket shown in FIGS. The amount of movement is extremely small compared to the sum of the amounts. Therefore, the passage hole side seal portion of the gasket main body is securely held in the gasket groove without being displaced.

[0010]

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. Since the gaskets mounted on the heat transfer plates (3) and (3 ') have the same configuration, only the gasket mounted on the heat transfer plate (3) will be described below. For the gasket to be mounted on the, a dash is attached to the reference numeral and the description is omitted.

As shown in FIGS. 1 to 4, the gasket (21) according to the present embodiment is formed by integrally forming a gasket main body (8) and a passage hole gasket (9). Open spaces provided on both sides of the passage hole side seal portion (10) of the gasket body portion (8) for sealing the fluid flow path (6) of (3) and on both sides of the atmosphere open space portion (12). The seal portions (14) and (14) are integrally connected by connecting portions (22) and (22) provided in the open-to-atmosphere space (12). As shown in FIG. 3, the connecting portions (22) and (22) of the gasket (21) are formed to have substantially the same thickness as the gasket body (8) and the passage hole gasket (9).

A gasket groove (23) into which the gasket (21) can be fitted is formed on the outer peripheral edge of the heat transfer plate (3), and the gasket main body (8) and the passage hole gasket ( 9) and open space seal part (14) (14)
Gasket groove (23) of heat transfer plate (3)
A locking piece (not shown) that can be locked and fixed is integrally formed with a locking recess (not shown) formed in a predetermined portion outside the, and when the gasket (21) is fitted into the gasket groove (23), The locking piece of the gasket (21) fits and locks into the locking portion of the heat transfer plate (3), and the gasket main body (8), the passage hole gasket (9) and the open space seal (14) ( 14) does not move in the linear direction and the curved direction.

With the gasket (21) fitted in the gasket groove (23) of the heat transfer plate (3),
When a high-temperature fluid flows through the fluid flow path (6) or the fluid flow path (7), and the thermal effect causes a heat shrinkage action on the gasket (21), the open space seal portions (14) (14) shrink in a linear direction. Attempt to open the seal (14) (1
The direction in which the gasket groove (23) attempts to shrink is along the linear direction of the gasket groove (23).
3) and the linear part of the gasket (21) are locked and fixed in place, so the linear open space seal part (14)
The heat shrinkage movement of (14) is suppressed. Accordingly, the open space seal portion (14) of the gasket main body (8) is prevented from moving by heat shrinkage, so that the open space seal portion (14) and the passage hole side seal portion (10) of the gasket main body (8) are not connected. A very small amount of movement is caused only by the thermal contraction of the connecting portions (22) and (22) connecting the gasket, and the passage hole side seal portion (10) of the gasket main body (8) is pulled toward the passage hole gasket portion (9). And is securely held in the gasket groove (23) without displacement.

In the above embodiment, the open space seal portions (14) and (14) and the passage hole side seal portion (10) of the gasket main body (8) are connected by the connection portions (22) and (22), respectively. Although the case has been described, the present invention is not limited to this, and one open space seal portion (14) and the passage hole side seal portion (10) may be connected by a single connecting portion.

[0015]

According to the gasket of the present invention, the double
Passage hole side seal of the gasket body that constitutes the seal structure
The heat transfer plate is partially locked and fixed to the heat transfer plate to prevent heat shrinkage.
Since the gasket is thermally contracted due to the thermal effect of the high-temperature fluid, the passage hole side seal portion of the gasket main body is attached to the passage hole gasket side because it is integrally connected to the stopped open space seal portion at the connection portion. Will not be pulled. Therefore, the passage hole side seal portion of the gasket main body is securely held without being displaced in the gasket groove, and the sealing performance does not deteriorate.

Further, since there is no displacement of the mounting position of the gasket with respect to the gasket groove of the heat transfer plate, even if the stacked heat transfer plates are tightened, the heat transfer plate and the gasket will not be damaged. Furthermore, the press-fitting work of the gasket into the gasket groove as in the past is unnecessary,
Moreover, since there is no need to mold the locking piece into a trapezoidal cross section,
It is easy to manufacture and an inexpensive gasket can be manufactured.

[Brief description of the drawings]

1A and 1B are plan views showing an embodiment of a gasket according to the present invention fitted on a heat transfer plate.

FIG. 2 is an enlarged plan view of a main part of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIGS. 5A and 5B are plan views showing a first conventional gasket mounted on a heat transfer plate.

FIG. 6 is an enlarged plan view of a main part of FIG. 5;

FIG. 7 is an explanatory view of an open space seal portion of the gasket shown in FIG.

FIG. 8 is a perspective view showing a second conventional gasket mounted on a heat transfer plate.

[Explanation of symbols]

 1, 1 'Heat transfer surface 2, 2' Fluid flow hole 3, 3 'Heat transfer plate 6, 7 Fluid flow path 8, 8' Gasket main body 9, 9 'Passage hole gasket 13 Leakage fluid discharge holes 22, 22 , 22 ', 22' Connection 23, 23 'Gasket groove

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28F 3/10 F28D 9/00

Claims (1)

(57) [Claims] 1. A heat transfer plate having fluid passage holes formed at four corners of a heat transfer surface. The heat transfer plate is fitted in a gasket groove on a peripheral edge of a heat transfer plate by locking and fixing a proper position, and sealing the fluid passage. You
Of the gasket body and the heat transfer plate
With a passage hole gasket that seals a predetermined fluid passage hole
And between the fluid flow path and a predetermined fluid passage hole.
The gasket main body passage hole side seal and passage hole gas
If a double seal structure is used with the flow path side seal part of the
In both cases , the gasket body and the passage hole gasket are
Open space seal portion of the linear shape having a concave leakage fluid discharge hole that is disposed in the air open space portion formed between the flow path side seal portion of the passage hole sealing section and the passage hole gasket portion of the gasket main body portion In the gasket connected by
A gasket for a plate heat exchanger, wherein the passage hole side seal portion of the gasket main body portion and the open space seal portion are integrally connected by a connection portion having a predetermined thickness.