JPH0810757Y2 - Plate heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a plate heat exchanger in which a required number of plates are stacked with a gasket interposed.

[Conventional technology]

The plate heat exchanger is a plate having a heat transfer surface on which an appropriate uneven pattern is formed, laminated by a required number of sheets with a gasket interposed therebetween, and tightened.
It is configured such that the seed fluids alternately pass through and heat is exchanged between the two fluids through the plate.

A conventional example of such a plate heat exchanger will be described with reference to FIGS. In the figure, (1) is a plate having a heat transfer surface (1a) on which an appropriate concavo-convex pattern (not shown) is formed, and fluid passage holes (2) (3) (4) at four corners.
(5) is formed so that the fluid passage holes (2) and (3) are communicated with each other to surround the heat transfer surface (1a) and close the other fluid passage holes (4) and (5). A gasket (6) made of an elastic material having heat resistance is attached. The plates (1) are alternately turned upside down to stack the required number of sheets,
This is suspended between two upper and lower guide bars (9) (10) installed between the fixed frame (7) and the support bar (8), and the fixed frame (7) and the guide bars (9) (10) are suspended. ) Tightening bolt (12) between it and the movable frame (11)
It is assembled as a plate heat exchanger by tightening with (12) ... and nuts (13) (13). Further, in this plate heat exchanger, two fluid passages are formed between the plates (1) (1) ... By alternately inverting and stacking the plates (1) with the gasket (6) interposed therebetween. They are formed alternately, and two kinds of fluids are alternately passed through this fluid passage to perform heat exchange.

In such a plate heat exchanger, as shown in FIG. 8, a gasket groove (1
By fitting the gasket (6) to the plate (4) and then stacking and tightening the plates (1), the gasket groove (14) of the plate (1) adjacent to the gasket (6).
Is pressed against the back surface of the plate to form an airtight fluid passage between the plates (1), (1), ... To prevent the fluid from leaking to the outside from between the plates (1), (1).

[Problems to be solved by the device]

As shown in FIG. 8, the gasket (6) used in the conventional plate heat exchanger is usually formed so that its cross section is solid and filled with an elastic material.
However, since the gasket (6) having a solid cross section has a large compressive load, it cannot be completely sealed unless it is firmly tightened, and a large amount of labor is required for the tightening work. .

This invention has been proposed in view of the above-mentioned conventional drawbacks, and an object of the invention is to provide a plate heat exchanger capable of saving labor in tightening work and exhibiting sufficiently good sealability. To provide.

[Means for solving the problem]

In order to achieve the above-mentioned object, this invention laminates a required number of heat exchange plates each having a heat transfer surface formed with an appropriate uneven pattern via a gasket made of a heat resistant elastic material such as synthetic rubber. In the plate heat exchanger in which the gasket is tightened, the gasket can be deformed to the inner wall of the gasket in the plate tightening direction with a small tightening force, and the gasket is fluidized outward. A slit is formed so that it can be pushed and spread.

Further, in the present invention, in the above structure, a lip whose upper end is in contact with the back surface of the gasket groove of the adjacent plate is formed on the inner peripheral side of the upper surface of the gasket in a protruding shape.

[Operation] According to the present invention, by forming the slits on the inner wall of the gasket, the gasket can be easily deformed in the plate tightening direction, and the gasket is deformed by a small tightening force so that the gasket groove of the adjacent plate is deformed. The pressure of the fluid itself provides a sealing effect because the fluid that has entered into the slit pushes the gasket outward and spreads while pressing the back surface of the fluid.

In addition, since the lip is formed on the inner peripheral side of the upper surface of the gasket, the lip is pressed against the back surface of the gasket groove of the adjacent plate by the pressure of the fluid, so that the lip also provides a sealing effect.

〔Example〕

FIG. 1 is a cross-sectional view of an essential part showing an embodiment of the plate heat exchanger according to the present invention.

In FIG. 1, reference numeral (21) is a plate, and a heat transfer surface (21a) having an appropriate uneven pattern (not shown) formed on the periphery thereof.
A gasket groove (22) is formed around the entire circumference of the gasket. (23) is a gasket fitted in the gasket groove (22) of the plate (21), made of an elastic material having heat resistance such as synthetic rubber, and exposed to the heat transfer surface (21a) of the plate (21). It is formed in a substantially C-shaped cross section having a slit (23a) extending from the inner wall surface toward the inside.

A plate heat exchanger according to the present invention is a plate (2) having the gasket (23) fitted in a gasket groove (22).
It is assembled by alternately inverting 1) and stacking the required number of sheets, and tightening them between the two upper and lower guide bars and between the fixed frame and the movable frame.

In the plate heat exchanger according to the present invention having the above configuration,
Since the slit (23a) is formed on the inner wall of the gasket (23), the gasket (23) can be easily deformed in the plate tightening direction, and the gasket (13) is deformed by a small tightening force to adjoin the adjacent plates ( 21) is pressed against the back surface of the gasket groove (22) to maintain airtightness between the plates (21) (21). In addition, the slit (23a) is attached to the gasket (23).
Since it is formed on the inner wall surface of the gasket, the fluid that has entered the slit (23a) of the gasket (23) during operation is
Since it spreads outward in step 3), the sealing performance is exerted by the fluid pressure itself and self-sealing is performed.

The invention is not limited to the above embodiment, but as shown in FIG. 2, the gasket groove (22) of the plate (21) whose upper end is adjacent to the inner peripheral side of the upper surface of the gasket (23). The lip (23b) reaching the back surface of the may be formed in a protruding shape. By doing so, the lip (23b) of the gasket (23) is adjacent to the plate (2
Since it is pressed against the back surface of the gasket groove (22) of 1), the lip (23b) also provides a sealing effect, and the sealing performance is further improved. Besides, as shown in FIG. 3 and FIG. 4, in order to enhance the sealing property with the adjacent plate (21), the groove (23c) or the ridge (23d) is formed on the upper surface of the gasket (23). Is also good.

[Effect of device]

As described above, according to the present invention, by forming the slit on the inner wall of the gasket, the gasket is easily deformed in the plate tightening direction with a small tightening force, and the tightening work can be omitted. As a result, not only the assembling property is improved, but also the self-sealing is performed by the fluid pressure itself, so that the sealing property of the gasket can be made higher and more reliable, and the reliability can be improved. Further, since the lip is formed on the inner peripheral side of the upper surface of the gasket, the sealing effect can be obtained also by the lip, and the reliability is further improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a plate heat exchanger according to the present invention, and FIG. 2 is a longitudinal section of an essential part showing another embodiment of the present invention. It is a side view. Also, FIGS. 3 and 4
The figure is a longitudinal sectional view showing a modified example of the gasket. FIG. 5 is an overall perspective view showing an example of a plate heat exchanger, and FIG. 6 is a plan view of a plate and a gasket. Further, FIG. 7 is an exploded perspective view of an essential part of the plate heat exchanger, and FIG. 8 is a longitudinal sectional view of an essential part of the conventional plate heat exchanger. (21) …… Plate, (22) …… Gasket groove, (23)
…… Gasket, (23a) …… Slit, (23c) …… Lip.

Claims (2)

[Scope of utility model registration request] 1. A heat exchange plate having a heat transfer surface having an appropriate uneven pattern is laminated with a required number of plates through a gasket made of an elastic material having heat resistance such as synthetic rubber, and the plates are tightened. In the plate heat exchanger, the inner wall of the gasket can be deformed in the plate tightening direction with a small tightening force, and the gasket can be expanded outward by a fluid. A plate heat exchanger characterized in that a slit is formed in the plate heat exchanger. 2. The lip according to claim 1, characterized in that a lip whose upper end contacts the back surface of the gasket groove of the adjacent plate is formed on the inner peripheral side of the upper surface of the gasket in a protruding shape. Plate heat exchanger.