JPH0435745Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention uses a plastic tube heat exchanger that uses plastic tubes as heat transfer tubes, for example, as a shell-and-tube heat exchanger or in a solvent recovery device. The present invention relates to a mounting structure for a plastic tube heat exchanger that enables low-cost and highly reliable sealing and fixing when the plastic tube heat exchanger is mounted by penetrating the wall surface of the container.

[Prior art] Heat exchangers that use plastic tubes as heat transfer tubes have a structure in which a large number of ultra-thin plastic tubes are bundled, so although the thermal conductivity of the material itself is inferior to that of metal, the unit It has been widely used in recent years because it has a large heat transfer area per volume and can be made smaller and lighter. Among them, plastic tubes made of fluororesin (for example, Japanese Patent Publication No. 43-3851) are chemically inert to corrosive liquids such as strong acids and strong alkalis, or organic solvents, and are non-adhesive. It is particularly suitable for manufacturing high-purity products because it is resistant to scale and sludge and allows for stable heat exchange, and since there is no elution of harmful substances into the liquid in the liquid tank or the fluid in the plastic tube. Optimal.

Such a plastic tube heat exchanger is, for example, as described in Utility Model Publication No. 52-21469 and Japanese Patent Publication No. 45-35951. It is often used as a shell-and-tube type, and therefore, the sealing performance of the mounting part is extremely important, and it is also required that it be easy to install and remove in consideration of maintenance and inspection.

However, in the conventional mounting structure described above, it is difficult to retighten the sealing part, so the sealing performance is not sufficient for long-term use or heat cycling, and the installation cost is high due to the large number of parts. Furthermore, there are several problems that need to be improved, such as the inability to easily install and remove them.

[Problems to be solved by the invention] This invention was made in view of the above-mentioned drawbacks of the prior art. The purpose of the present invention is to provide a mounting structure that is simple and can maintain good sealing performance when used as a tube heat exchanger.

[Means for Solving the Problems] In order to achieve the above object, the mounting structure of the plastic tube heat exchanger according to this invention uses a bundle of plastic tubes arranged in a honeycomb shape with the end portions integrally fused with a flanged sleeve. A plastic tube heat exchanger is disposed inside a container, and a flanged sleeve is attached at a flange portion on the container side. a split ring that supports the flanged sleeve by forming the same plane as the first seal ring, and a first seal ring made of a sheet-like gasket that is in contact with the end surface of the split ring on the side opposite to the container and the flange connection surface of the flange on the container side; a plurality of flanged sleeve mounting bolts; an intermediate flange having female threaded holes that are screwed into the plurality of bolts; the intermediate flange encloses the flanged sleeve in its inner space in contact with the first seal ring; and the intermediate flange; The receiving hole has a plurality of through holes for receiving the bolts screwed into the flanged sleeve, and the receiving hole into which the flanged sleeve is fitted has a protruding portion facing the outer end surface of the flanged sleeve of the flanged sleeve, a support plate that presses the inner end surface of the flange of the attached sleeve to the split ring via the inner edge of the first seal ring protruding toward the inner peripheral surface of the intermediate flange; and a protrusion of the support plate and the flange. A second seal ring provided between the outer end surface of the collar of the sleeve, a flanged end joint for connecting to this support plate and supplying fluid to the heat exchanger, and connecting this flanged end joint to the support plate. and a third seal ring interposed between the flanged end joint and the support plate.

[Function] When a plastic tube heat exchanger with both end portions integrally molded is placed inside a container and the end portion is installed by penetrating the wall surface of the container, or when the end portion is attached to the container as a shell and tube type heat exchanger. In the case of attaching to a flange portion of a flange, etc., by adopting the above structure, it becomes possible to attach with a smaller number of parts than the conventional example described in the above-mentioned publication. In particular, the seal portion between the intermediate flange and the container-side flange, the flange sleeve and support plate, and the seal portion between the flange sleeve and container must be adjusted separately by tightening bolts and nuts, respectively. This makes retightening highly effective. Therefore, leakage does not occur during long-term use or heat cycles, and good sealing performance can be maintained.

[Example] Fig. 1 is a partial sectional view showing a mounting structure when a plastic tube heat exchanger is applied to a shell-and-tube type heat exchange device, and Fig. 2 is an overall view thereof.

The mounting structure of this plastic tube heat exchanger is made of, for example, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA).
A plastic tube heat exchanger 3 having a sealed structure in which the ends of a plastic tube bundle 1 consisting of It is arranged in the container 10 so as to protrude from the container side flange 11. This container side flange 1
An annular stepped portion 13 is provided on the inner diameter side of the flange connecting surface 12 of No. 1, and a split ring 14 having a thickness that forms the same plane as the flange connecting surface 12 is provided on the stepped portion 13.
is installed. Then, the container side flange 11
straddles both the connecting surface 12 of the split ring 14 and the end surface of the split ring 14 on the side opposite to the container.
A first seal ring 15 made of a sheet-like gasket made of an elastic material such as the above is provided, and has a female threaded hole 17 that is screwed into a flanged sleeve mounting bolt 16 inserted from the opposite side of the flange connecting surface 12 of the container side flange 11. The intermediate flange 18, which is brought into pressure contact by tightening the bolt 16, seals and fixes the split ring 14 via the first seal ring 15, and the first seal ring present in the inner cavity thereof. The sleeve 15 is provided so that the inner end of the collar 4 of the sleeve 2 can be sealed and supported, leaving an inner edge of the sleeve 15. Further, a support plate 19 is disposed on the side opposite to the container of the intermediate flange 18, and a flanged sleeve attachment bolt 16 is screwed onto the intermediate flange 18 and protrudes.
are inserted into a plurality of through holes 20 formed in the support plate 19, and the support plate 19 is fixed by tightening nuts 21. A protrusion 22 facing the outer end surface of the flange 4 of the flanged sleeve 2 is formed at the tip end of the inner circumferential surface of the receiving hole of the support plate 19 opposite to the container for receiving the flanged sleeve 2.
9 is this protrusion 2 by tightening the nut 21.
The container side end surface of the plastic tube heat exchanger 3 is pressed against the outer end surface of the flange 4 of the flanged sleeve 2 via the second seal ring 23, and the inner end surface of the flange 4 of the flanged sleeve 2 is pressed against the sheet. A first seal ring 15 made of a shaped gasket is brought into pressure contact with the split ring 14 via its inner edge.
Further, a flanged end joint 25 is provided on the end surface of the support plate 19 on the side opposite to the container, for supplying fluid to the plastic tube heat exchanger 3 by being press-contacted via a third seal ring 24. The joint 25 and the support plate 19 are fastened and fixed with bolts 26.

FIG. 2 is an overall view of the plastic tube heat exchanger 3 installed in a container (shell) as a shell and tube type heat exchanger. In the figure, fluid inlets 31 and 32 are provided at two locations on the outer peripheral surface.
A plastic tube heat exchanger 3 is connected to a cylindrical container 10 having flanges 11 at both ends.
As shown in FIG. 1, the flanged sleeve 2 fused to the end of the plastic tube bundle is fixed to the flange 11 of the container using an intermediate flange 18, a support plate 19, etc., and is further attached to the support plate 19. is connected to a flanged end joint 25.

In addition, in this embodiment, considering chemical resistance etc., a flanged end joint 25 is used as shown in FIG.
A lining layer 27 made of a chemical-resistant polymer material such as tetrafluoroethylene resin is provided on the inner circumferential surface and flange portion of the support plate 19 , and a third seal ring 24 is provided between the protrusion 22 of the support plate 19 and the flange portion. A liner made of PFA formed into a flanged cylindrical body is also used to cover the end face of the attached end joint, and the flange-shaped portion 28 of this liner
This seals and holds the space between the support plate 19 and the flanged end joint 25. In this case, the liner can be preformed, softened by heating, and then fitted into a predetermined position. At this time, a back-absorbing gasket 29 made of asbestos or the like is inserted between the flange portion 28 and the end face of the support plate position 9 to improve sealing performance. Furthermore, it is desirable to provide a backup gasket 30 on the flange portion of the flanged end joint 25 as well. However, in this case, if the liner is made of a chemically resistant polymeric material such as fluororubber, sufficient sealing performance can be obtained without using the backup gaskets 28 and 29.

With such a configuration, all of the contact surfaces are made of chemically inert polymeric material, which prevents impurities from leaching out or getting mixed in, making it suitable for use in heat exchange with highly pure fluids such as ultrapure water. be able to.

Further, in the above embodiment, a jacket-shaped gasket made of, for example, felt-like asbestos coated with a fluororesin is used as the second seal ring 23, but it is of course possible to use other seal rings such as an O-ring. It is.

In the mounting structure according to the present invention, the intermediate flange 18
The sealing between the flange 11 and the container side flange 11 is achieved only by tightening the flanged sleeve mounting bolts 16 via the first seal ring 15 made of a sheet-like gasket, and the sealing between the flanged sleeve 2 and the support plate 19 The seal between the flanged sleeve 2 and the container 10 is achieved by tightening a nut 21 via a second seal ring 23 and a first seal ring 15, respectively. If the insertion direction is reversed, their relationship is reversed), so it is possible to adjust each separately. Therefore, good sealing performance can be maintained over a long period of time by appropriately tightening the seal. Furthermore, since the structure is simplified and installation is easier than conventional ones, it becomes an economical installation structure. In this case, it is of course possible to exchange the positions of the bolt 16 and nut 21.

Although not shown, instead of using a liner as in the above embodiment as the third seal ring, for example, an annular groove may be provided on the end surface of the support plate 19 on the flanged end joint side or on the flange surface of the flanged end joint 25. The annular groove may be provided with an O-ring for sealing, or a gasket made of an elastic material may be provided between the support plate 19 and the flange surface of the flanged end joint 25 for sealing.

[Effects of the invention] As explained above, according to this invention, when a plastic tube heat exchanger is placed inside a container and its end portion is attached to the flange of the container, each seal portion can be easily retightened. , and each can be adjusted separately, so if, for example, the sealing performance deteriorates due to long-term use or heat cycling, this can be easily dealt with, and therefore good sealing performance can be maintained over a long period of time. can do. Furthermore, since the number of parts is small and the structure is simple, the cost of mounting members is reduced, and the mounting work is also simplified, resulting in an economical mounting structure.

Note that this invention is not limited to the above embodiments, and may include, for example, changing the locking means of the container side flange and the flanged end joint, changing the material of the plastic tube, changing the shape of the seal ring, etc.
Of course, various modifications within the technical idea of this invention are possible.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing the mounting structure of a plastic tube heat exchanger according to this invention, and FIG. 2 is an overall view thereof. DESCRIPTION OF SYMBOLS 1...Plastic tube bundle, 2...Flanged sleeve, 10...Container, 13...Annular stepped portion, 1
4... Split ring, 15... First seal ring, 17... Female threaded hole, 18... Intermediate flange,
19...Support plate, 22...Protrusion, 23...Second seal ring, 24...Third seal ring,
25...Terminal joint with flange.

Claims (1)

[Scope of utility model registration request] A plastic tube heat exchanger comprising a bundle of plastic tubes whose end portions are integrally fused with a flanged sleeve and arranged in a honeycomb shape is disposed in a container, and the flanged sleeve is attached at a flange portion on the side of the container, in which the said container a split ring disposed on the annular stepped portion on the inner diameter side of the flange connection surface of the side flange to form the same plane as the flange connection surface and support the flanged sleeve; The first seal ring has a first seal ring made of a sheet gasket in contact with the flange connection surface of the container side flange, a plurality of flanged sleeve mounting bolts, and a female threaded hole to be screwed into the plurality of bolts. an intermediate flange that encloses the flanged sleeve in its inner space in contact with the intermediate flange, and a plurality of through holes for receiving the bolts screwed into the intermediate flange, and an inner periphery of the receiving hole into which the flanged sleeve is fitted. The inner edge of the first seal ring has a protrusion facing the outer end surface of the flange of the flanged sleeve, and the inner edge of the first seal ring has an inner edge surface of the flange of the flanged sleeve that protrudes toward the inner peripheral surface of the intermediate flange. a support plate that is brought into pressure contact with the split ring through the support plate;
a second seal ring provided between the protrusion of the support plate and the outer end surface of the collar of the flanged sleeve; and a flanged end joint for connecting to the support plate and supplying fluid to the heat exchanger. , locking means for locking the flanged end joint to the support plate;
A mounting structure for a plastic tube heat exchanger comprising a third seal ring interposed between the flanged end joint and the support plate.