JPH0616302Y2 - Spiral heat exchanger - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spiral heat exchanger, and more particularly to a sealing structure for a lid flange.

2. Description of the Related Art Conventionally, a spiral heat exchanger that seals the open end edges of a heat transfer plate spirally wound with an outer shell that covers the outer circumference of the heat transfer plate with a lid flange via a gasket has been used. It is known.

However, when one gasket is used in the spiral heat exchanger as described above, a heat exchange medium having several or tens of turns provided in the inner peripheral portion for sealing by tightening is used. A large tightening force is required to reliably seal the members of the sealing material 2 for preventing mixing.

In addition, when the sealing material is projected from the end edge of the spiral heat transfer plate, the sealing of the outer peripheral part is incomplete, and there is a problem that the fluid leaks to the outside. As a countermeasure against these problems, Japanese Utility Model Laid-Open No. 62-136768 discloses an example in which a soft sponge gasket is used, but such a gasket may not be used depending on the liquid quality and the liquid temperature.

An object of the present invention is to solve the above problems and to provide a structure capable of easily and surely achieving a seal by using one gasket.

Means for Solving the Problems In order to achieve the above object, the present invention provides a spirally wound heat transfer plate and an opening end edge portion of an outer shell that covers the outer circumference of the heat transfer plate through a gasket. In the spiral heat exchanger, the lining material provided on the inner surface of the lid flange is provided with a concave portion inside the outer peripheral sealing portion in a structure in which the lid flange and the outer body flange are tightened and sealed.

In the present invention, since the recess is provided on the inner surface of the lid flange inside the outer peripheral seal portion, a strong tightening force is applied by tightening the lid flange on the outer periphery, and there is a slight tightening margin inside the recess. To seal the edge of the heat transfer plate. Even if the sealing material for preventing mixing of the fluid is slightly projected to the end edge portion, the projection is absorbed by the concave portion, so that the sealing action can be strengthened as a whole.

Embodiments Embodiments shown in the drawings will be described.

Reference numeral 1 denotes a heat transfer plate, which is spirally wound and forms a fluid passage through a spacer. Reference numeral 2 denotes a seal material, which is provided at every other edge of the heat transfer plate 1 so as to avoid fluid mixing. The sealing material 2 may be provided for several to several tens of turns depending on the heat transfer area. An outer shell 3 covers the outer circumference of the wound heat transfer plate 1. 4 is the outer body flange,
It is attached to the end of the outer case 3. Reference numeral 5 is a lid flange, and 6 is a lining material, which is provided on the inner surface of the lid flange 5. 7
Is a concave portion and is provided inside the outer peripheral seal of the lining material 6 of the lid flange 5. 8 is a lining material, which is provided on the outer body flange 4.

A gasket 9 is a bolt between the lid flange 5 and the outer body flange 4 with the gasket interposed between the lining materials 6 and 8.
Sealed by tightening with nuts.

When the lid flange 5 and the outer body flange 4 are tightened, the outer peripheral seal portion is firmly tightened between the lining materials 6 and 8 via the gasket 9, so that the sealing action is ensured.
Further, at the central portion where the concave portion 7 is provided, the gasket 9 is appropriately tightened with a tightening margin according to the edge portion of the heat transfer plate 1 and the sealing material 2. That is, the gasket on the outer peripheral portion is reduced in thickness by being tightened, and the sealing material 2 and the gasket 9 are in strong contact with each other, but the gap in the recess 7 is reduced by the amount of the gasket thickness reduced by tightening, and the bottom surface of the recess is The gasket is pressed and the sealing action works.

The recess 7 is preferably about 0.1 to 0.5 mm, but may be formed as shallow or deep as long as the short path inside the heat exchanger is acceptable.

Effect of the Invention Since the present invention has the above-mentioned configuration, it is firmly sealed at the outer periphery through the gasket sandwiched by the running material, and has a slight tightening allowance inside due to the recess provided in the lining material. Since it is tightened and fixed, the overall sealing effect is secured. Further, since the tightening force may be increased by strengthening the outer peripheral portion, it is easier than the conventional example and its practical effect is large.

[Brief description of drawings]

FIG. 1 is a sectional view of a spiral heat exchanger of the present invention, and FIG. 2 is an enlarged sectional view of a main part. 1 ... Heat transfer plate, 3 ... Outer shell 4 ... Outer shell flange, 5 ... Lid flange 6, 8 ... Lining material, 7 ... Recessed portion 9 ... Gasket

Claims (1)

[Scope of utility model registration request] 1. A heat transfer plate wound in a spiral shape and an opening end edge portion of an outer case covering the outer periphery of the heat transfer plate are tightened between a lid flange and an outer case flange via a gasket to seal. In the above structure, the spiral heat exchanger is characterized in that the lining material provided on the inner surface of the lid flange is provided with a concave portion inside the outer peripheral seal portion.