JPS632793Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in the support structure of a fluid sealing gasket in a plate heat exchanger used under high pressure.

In general, a plate heat exchanger, as shown in Fig. 1, consists of a large number of heat exchange plates (hereinafter simply referred to as plates) 1A and 1B having heat transfer surfaces 2 stacked together with fluid sealing gaskets 3 and 4 interposed therebetween. Two types of heat exchange channels 5 and 6 are formed alternately.

By the way, the gaskets 3 and 4 interposed between the plates 1A and 1B are made of synthetic rubber, asbestos, Teflon, etc. depending on the flowing fluid, and these gaskets are formed in the gasket grooves formed in the plates 1A and 1B. It is accommodated and supported within 7 and 8.

a gasket groove 7 that supports the gaskets 3 and 4;
8 is the plate 1 as shown in FIGS. 2 to 4.
In order to form an overlapping part 9 when A and 1B are stacked, wide parts 7a and 8a and narrow parts 7b and 8b are alternately and continuously formed, and the grooves of the gasket grooves 7 and 8 are formed in a continuous manner. The bottom is formed into a flat surface so that the gaskets 3 and 4 can be closely bonded and the plates 1A and 1B can be closely overlapped with each other.

In such a heat exchanger, when high-pressure fluid flows through the heat exchange channels 5 and 6, high pressure acts from the side on the gasket grooves 7 and 8 of the plates 1A and 1B and the gaskets 3 and 4, causing the plates 1A and 1B to flow. Since gasket 1B is made of a thin plate, it cannot withstand high pressure, and gasket 3,
As the gasket 4 deforms, the gasket groove 8 or 7 deforms, causing a so-called collapse phenomenon in which the gasket 3 or 4 protrudes from the gasket groove 7 or 8, resulting in fluid leakage. That is, the gasket grooves 7 and 8 are pushed by the fluid and the gaskets 3 and 4, causing deformation such that the width of the gasket grooves 7 and 8 is expanded and the grooves become flat. On the other hand, this deformation is not uniform over the entire circumference of the gasket grooves 7 and 8, and is caused by the narrow parts 7b and 8b and the wide part 7 of the gasket grooves 7 and 8.
a, 7b, the wide parts 7a, 8 have low rigidity.
a is slightly larger, gasket grooves 7 and 8
was also deformed into a waveform along the groove direction, causing the above-mentioned problem.

In order to solve the above drawbacks, plates 1A and 1B
It is possible to increase the thickness of the plate, but this reduces the heat exchange efficiency and increases the weight of the product, which poses problems in terms of ease of assembly and cost.

This idea was developed to improve and eliminate the above-mentioned drawbacks of conventional plate heat exchangers, and to improve the strength of the plates without making them thicker so that they could sufficiently support the gasket even under high pressure. Provides a heat exchanger made by:

That is, in this invention, a reinforcing protrusion is formed on the groove bottom of the gasket groove formed around each plate, along the direction of the groove, at a position that does not interfere with the plate provided on the back surface of the gasket groove.

Examples of this invention will be described below with reference to the drawings.

In FIGS. 5 to 8, reference numeral 10 denotes a plate, and a gasket groove 12 is formed on the circumferential surface of the plate over the entire circumference so as to surround the heat transfer surface 11. This gasket groove 12 has an inverted trapezoidal cross section,
In addition, narrow width parts 13 and wide width parts 14 of appropriate length are alternately formed, and an overlapping part 15 that serves as a support when stacking plates is integrally formed between the wide width parts 14, 14, that is, on the outside of the narrow width part 13. is formed. This polymerization part 1
5 overlaps with the wide part 14' of the gasket groove 12' of the plate 10' stacked adjacent to each other, and conversely overlaps the groove bottom 1 of the wide part 14 of the gasket groove 12 of the plate 10.
4a overlaps with the overlapping portion 15' of the other plate 10' (see FIGS. 7 and 8).

The groove bottom 14a of the wide part 14 of the gasket groove 12 has a position that does not interfere with adhesion with the gasket 17 to be accommodated and does not interfere with the overlapping part 15' of the other plate 10', that is, when the other plate is overlapped. ,
A reinforcing protrusion 16 protruding toward the back side is formed along the groove direction at a position adjacent to the inside of the overlapping portion. A gasket 17 is housed in the gasket groove 12 of the plate 10, and is made of synthetic rubber, asbestos, Teflon, or the like, and has a width that matches the narrow portion 13 of the gasket groove 12.

Furthermore, plate 10 and the adjacent plate 10' which are combined therewith are formed in the same shape, and further, the gaskets 17, 17' which are received in the gasket grooves 12, 12' respectively formed therein are also formed in the same shape, and when stacking, one of the plates 10' is rotated 180 degrees and assembled.

In the heat exchanger in which the plates 10, 10' and the gaskets 17, 17' having the above structure are combined and stacked, the wide portions 14, 14' of the gasket grooves 12, 12' formed in the plates 10, 10', respectively. The protrusions 16, 16' provided on the plates 10, 1
In addition to suppressing deformation along the groove direction of 0', the width direction,
That is, the wall surfaces 16a, 16a' at the front and rear ends of the protrusions 16, 16' suppress the deformation along the direction orthogonal to the groove direction, thereby suppressing the deformation of the gasket grooves 12, 12'.
Further, the gasket 1 with which the protrusions 16 and 16' are opposed
Since the upper side surfaces of plates 10 and 17' are supported, even if high-pressure fluid is flowed into the heat exchange channel, the gasket grooves 12 and 12' of plates 10 and 10' will be deformed and floated due to the pressure. , also gasket 17,
17' will not deform and protrude,
No fluid leakage occurs.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and as shown in FIG.
The protrusions 16 provided on the wide portion 14 may be formed finely and intermittently. This improves the reinforcement of the plate 10 and reliably prevents it from floating under high pressure.

As explained above, this invention is based on a plate heat exchanger in which a large number of heat exchange plates are stacked with gaskets interposed therebetween. Since reinforcing protrusions are formed at the bottom of the groove along the groove direction, these reinforcing protrusions prevent the gasket groove formed in the plate from deforming and the gasket accommodated in the gasket groove from falling. This made it possible to exchange heat between fluids under high pressure.
Further, since the strength of the plate is improved, there is no need to increase the thickness of the plate, and the heat exchange rate is improved accordingly, and the ease of assembly is also improved.

[Brief explanation of drawings]

Figure 1 is a partially exploded perspective view of a typical heat exchanger.
Fig. 2 is a plan view of the main part showing the gasket groove of a conventional plate, Fig. 3 is an enlarged sectional view taken along the line of Fig. 2,
Figure 4 is an enlarged cross-sectional view taken from Figure 2, Figure 5 is a plan view of the main part of a plate used in the plate heat exchanger according to the present invention, and Figure 6 is a gasket groove of the plate according to the present invention. 7 and 8 are cross-sectional views of gasket grooves in a laminated state, and FIG. 9 is a plan view of main parts showing another embodiment. 10,10'...Plate, 12,12'...Gasket groove, 13,13'...Narrow width part, 14,1
4'...Wide part, 14a, 14a'...Groove bottom, 15,
15'...overlapping part, 16,16'...reinforcing protrusion,
17, 17'...Gasket.

Claims (1)

[Scope of utility model registration request] In a plate heat exchanger in which a large number of heat exchange plates are stacked with gaskets interposed therebetween, each heat exchange plate has a groove bottom of a wide part of a gasket groove consisting of a narrow part and a wide part provided in succession alternately. ,
A plate heat exchanger characterized in that a reinforcing protrusion is formed that protrudes toward the back side along the groove direction and adjacent to the plate overlapping portion.