JPH033813Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a spiral heat exchanger for cooling and heating a cover plate.

BACKGROUND ART Conventionally, a structure shown in FIG. 3 has been used to seal the heat exchanger plate and the outer shell of a spiral heat exchanger with a cover plate. That is, the heat transfer plate 13 wound in a spiral shape
When sealing the outer shell 14 that covers the outer periphery with the cover plate 15, asbestos packing 16 is sandwiched between the flange 17 provided on the outer shell 14 and the cover plate 1.
5 were tightened and fixed, and the edge of the heat transfer plate 13 was pressed against the asbestos packing 16.

Problems to be Solved by the Invention In the conventional example, the asbestos packing 16 is hard, so it is difficult to seal evenly with the asbestos packing 16 unless both ends of the heat transfer plate 13 are precisely machined. Ta. Further, in order to prevent external leakage of fluid, the lid plate 15 and the flange 17 are tightened with a large force, but in this case, the lid plate 15 is bent by the tightening force, and the heat transfer plate 13 and the lid plate 15 are bent. A gap is formed between the two, a short pass occurs between adjacent channels, and the fluids mix with each other, resulting in a decrease in heat exchange performance.
In order to prevent this, a structure in which ribs 18 are provided on the cover plate 15 has been proposed, but the cover plate 15 and the flange 1
Strong force is required to tighten the heat exchanger plate 13 with
High precision was also required.

This invention solves the above conventional problems,
It is an object of the present invention to provide a spiral heat exchanger with a simple configuration, which does not have short passes between adjacent channels and does not require reinforcement of a cover plate with ribs or the like.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention has a structure in which the opening edge of the spirally wound heat transfer plate and the outer shell that covers the outer periphery is sealed with a cover plate. , a soft gasket is used between the opening edge of the heat transfer plate and the lid plate, a hard gasket such as asbestos is used between the flange provided on the outer shell and the lid plate, A means for tightening and fixing the lid plate and the flange was used.

Function The spirally wound heat transfer plate forms a partition between two types of fluids, and forms a flow path for heat exchange between the fluids. The lid plate seals the opening edge of the heat exchanger plate and the outer shell, but if a soft gasket is sandwiched between the opening edge of the heat exchanger plate and the lid plate and sealed, this gasket becomes the heat exchanger plate. Easily deforms depending on the shape of the opening edge,
Since they are pressed together, fluid leakage from this part can be prevented. In addition, since a hard gasket such as asbestos is used around the gasket and a soft gasket is used inside, excessive tightening force is not required when tightening the cover plate and flange, and the cover plate can be tightened by tightening. Never bends.

Embodiment FIG. 1 is a sectional view showing an embodiment of a spiral heat exchanger, in which both opening edges have the same sealing structure. Reference numeral 1 denotes a heat transfer plate which is spirally wound with appropriate intervals between spacers. A sealing material 2 is made of stainless steel or the like and is welded or bonded to every other opening edge of the heat exchanger plate 1. Reference numeral 3 denotes an outer shell, which covers the outer periphery of the winding end of the heat exchanger plate 1. A flange 4 is provided near the opening edge of the outer shell 3. A cover plate 5 seals the opening edge of the heat transfer plate 1. Reference numeral 6 denotes a tightening portion, which is tightened by bolting or the like so that the cover plate 5 can be pressed against the opening edge of the heat exchanger plate 1 via the flange 4. Reference numeral 7 is a cover ring, 8 is an asbestos gasket, and 9 is a lining, which prevents fluid leakage from the pressure contact portion between the outer shell 3 and the lid plate 5. 10 is a soft sponge gasket that prevents short passes between adjacent channels. sponge gasket 10
is somewhat thicker than the distance between the lining 9 and the opening edge of the heat exchanger plate 1. When the cover plate 5 and the flange 4 are tightened in this manner, as shown in an enlarged view in FIG.
0 is compressed and pushed laterally, and gathers in the flow path where there is no sealing material 2, and the thickness of the sponge gasket 10 increases in this portion 12, resulting in the formation of a wavy sponge gasket 10. Then,
By simply tightening and fixing the lid plate 5 and the flange 4 with a small tightening force, the degree of closeness between the opening edge of the heat exchanger plate 1 can be increased. Therefore, there is extremely little possibility that a short pass between adjacent channels will occur. The heat transfer efficiency of the seal portion of this example increased by about three times compared to the conventional example.

The material of the sponge gasket 10 must have sufficient softness so that the flat sponge gasket can become wavy when tightened. In this embodiment, the sponge gasket 10 was constructed using neoprene rubber. However, the material is not limited to this, and depending on the properties of the fluid flowing inside, it is also possible to use a soft gasket with strong heat resistance and chemical resistance. Further, depending on the shape of the spiral heat exchanger, only one side may have the sealing structure of this embodiment.

Effects The present invention uses a soft gasket in the seal between the opening edge of the heat exchanger plate and the cover plate, so that it can be sufficiently pressed and sealed with the edge of each heat exchanger plate.
There are no shot passes between adjacent channels, and the tightening force required to secure them is small, so there is no bending caused by tightening the cover plate and flange, and the spiral heat exchanger has extremely high heat exchange performance. I was able to provide it. Furthermore, since the structure is simple, assembly is easy and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is an enlarged sectional view of the same essential part, and FIG. 3 is a sectional view showing a conventional example. 1...Heat transfer plate, 3...Outer shell, 5...Lid plate, 10...Soft sponge gasket.

Claims (1)

[Scope of utility model registration request] In a structure in which an opening edge of a spirally wound heat transfer plate and an outer shell covering the outer periphery is sealed with a lid plate, there is a soft material between the opening edge of the heat exchanger plate and the lid plate. A spiral type heating device characterized in that a gasket made of asbestos or other hard gas is used between a flange provided on the outer body and the lid plate, and the lid plate and the flange are tightened and fixed. exchanger.