JPH0245657Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a spiral heat exchanger.

Structure of a conventional example and its problems A conventional spiral heat exchanger is shown in FIGS. 1 and 2.

In the case of FIG. 1, the fluid passage 12 for liquid A is sealed by the seal member 13, but the fluid passage 15 for liquid B is not sealed by the seal member 13. If a full-face gasket is used between the end of the heat exchanger plate and the lid to complete the sealing action in this area, the sealing contact area of the gasket will be large;
A large tightening force is required to tighten the lid 16, and unless the thickness of the lid 16 is increased, the tightening force may cause distortion and there is a risk of internal leakage. Further, in the case of FIG. 2, the end of the fluid passage 12 for liquid A is completely sealed by welding the heat exchanger plate 14, but the fluid passage 12 for liquid B is completely sealed.
5, since the lid body 16 and the edge portion of the heat transfer plate 14 are in contact with metal surfaces, the sealing effect may be insufficient and internal leakage may occur. As a means for preventing internal leakage, there is a method in which a full-face gasket is inserted between both ends of the heat transfer plate 14 and the lid, but the gasket may be cut off due to the tightening force of the lid.

Purpose of the invention The present invention solves the above-mentioned conventional drawbacks, and can completely seal the edge of the fluid passage and the lid with a small tightening force, thereby preventing internal leakage. The purpose of this project is to provide a spiral heat exchanger that can

Structure of the invention The spiral heat exchanger according to the invention consists of two long
It has two fluid passages formed by spirally winding a plurality of heat transfer plates, and a lid body that closes openings at both ends of the fluid passages, and an end of one of the two fluid passages. A seal member attached to the edge, a gasket fitting groove provided on the outer side of the seal member, a flexible string gasket fitted in the groove, and a lid tightened and fixed via the string gasket. Since the string-like gasket is flexible, the gasket deforms when the lid is tightened and fixed to the case, and can come into close contact with the inner surface of the lid.

DESCRIPTION OF EMBODIMENTS An embodiment of the spiral heat exchanger according to the present invention will be described with reference to FIGS. 3 to 5.

Reference numerals 1 and 2 indicate elongated heat transfer plates, which are spirally wound at regular intervals to form a fluid passage 3 for liquid A and a fluid passage 4 for liquid B. Reference numeral 5 denotes an outer shell containing the wound heat transfer plates 1 and 2; 6 a lid body that closes the opening edges of both ends of the fluid passages 3 and 4 together with the outer shell; It is tightened and fixed by the flange part. 7 is a sealing member;
It is attached to the edge of the fluid passage 3 in a state that corresponds to the lid 6 and slightly protrudes from the heat exchanger plates 1 and 2. 8 is a groove formed by cutting out the outer surface of the sealing member 7 in a concave shape, and 9 is a string-like gasket fitted into the groove 8 of the sealing member 7. String gasket 9
The lid body 6 is tightened and fixed via the flange portion of the outer body 5 against the elasticity of the body. In this case, since a string-like gasket is used, the seal contact area is small, and the tightening force is relatively small and sufficient, and a reliable sealing effect can be obtained.

FIG. 6 shows another embodiment, in which the sealing member 10 is installed inward from the edge of the fluid passage 3, thereby connecting the inner wall surfaces of both ends of the heat exchanger plates 1 and 2 and the outer surface of the sealing member 10. A gap is formed between the two, and a highly flexible string gasket 11 is attached to the gap,
The lid body 6 is tightened and fixed.

A donut-shaped gasket is used at the outermost part of the heat exchanger to prevent leakage to the outside.

Effects of the invention As mentioned above, the present invention has two fluid passages.
In addition to attaching a sealing member to the edge of one of the fluid passages, a groove is provided on the outer side of the sealing member in correspondence with the lid, and a flexible string-like gasket is attached to this groove, so that the lid When the gasket is tightened and fixed to the outer shell, the string-like gasket easily deforms and comes into close contact with the inner surface of the lid and the inner wall of the heat exchanger plate, providing a high sealing effect and eliminating the need for large tightening force. be. Especially when the string-like gasket is thin, both ends of the fluid passage can be completely sealed with a small tightening force, and there is no risk of internal leakage even when using a thin cover, which has great practical effects. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of a conventional spiral heat exchanger, with some parts peeled off. FIG. 2 is an enlarged cross-sectional view showing another example of the conventional product, and FIG. 3 is a side view showing an embodiment of the present invention, with a portion peeled off. FIG. 4 is an enlarged sectional view of the same essential parts, FIG. 5 is an explanatory view of FIG. 4 before the lid is closed, and FIG. 6 is an enlarged sectional view of the essential parts showing another embodiment. 1, 2...heat exchanger plate, 3, 4...fluid passage, 6...
... Lid body, 7 ... Seal member, 9 ... String gasket.

Claims (1)

[Claims for Utility Model Registration] (1) A device comprising two fluid passages formed by spirally winding two long heat transfer plates, and a lid body that closes openings at both ends of the fluid passages. and a sealing member attached to the edge of one of the two fluid passages, a gasket fitting groove provided on the outer side of the sealing member, and a flexible string fitted in the groove. A spiral heat exchanger characterized by comprising a gasket in the form of a string, and a lid body which is tightened and fixed via the gasket in the form of a string. (2) The spiral heat exchanger according to claim 1, wherein the outer surface of the sealing member is notched in a concave shape as a gasket fitting groove. (3) The spiral heat exchanger according to claim 1, wherein a gap is formed between the inner walls of the end portions of the two heat exchanger plates and the outer surface of the sealing member as the gasket fitting grooves.