Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Patent
1991-09-19
1993-01-12
Rivell, John
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
165167, F28F 310
Patent
active
051782120
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND ART
This invention relates to a plate-type heat exchanger comprising a required number of plates laminated through gaskets and is used in the fields of food and medicines where the use of an adhesive agent should be avoided in attaching the gaskets to the plates and in the field of general chemistry where improvements in gasket replacement maintenance is desired.
Generally, a plate-type heat exchanger comprises a required number of plates each having a heat transfer surface formed with a suitable unevenness pattern, said plates being laminated through gaskets to define a plurality of channels between adjacent plates, with two types of mediums flowing through alternate channels.
FIG. 9 is a partial perspective view showing a concrete example of a typical plate-type heat exchanger, wherein the numeral 1 denotes plates each having a heat transfer surface 2 with a suitable unevenness pattern (not shown) and having holes 3, 4, 5, 6 at four corners, and gaskets 7 of synthetic rubber or other elastic material having heat resistance are mounted, each gasket surrounding the associated heat transfer surface 2 in such a manner as to establish communication between the holes 3 and 4 and close the other holes 5 and 6. A required number of such plates 1 are alternately turned upside down and laminated to define a channel 8 for a medium a and a channel 9 for a medium b.
In such plate-type heat exchanger, as shown in FIG. 10, the gasket 7 is fitted in a gasket groove 10 formed in the peripheral edge of the plate 1. The plates 1 are laminated, whereby the gaskets 7 are pressed against the rear surfaces of the gasket grooves 10 of adjacent plates 1 to define sealed channels 8 and 9 between the plates 1, thus forming a sealing construction which prevents the mediums from leaking outside.
Heretofore, it has been common practice to fix said gaskets in the gasket grooves 10 by an adhesive agent. That is, since such adhesive agent suitably fixes the gaskets 7 in the gasket grooves 10 but allows the relatively easy removal of the gaskets when it is necessary to replace them, it has been generally used for fixing the gaskets in the gasket groove 10. When it is desired to adhesively fix the gaskets 7 in the gasket grooves 10 of the plates 1, however, it is necessary to wash the oil and grease and other extraneous substances, which hinder adhesion, off the surfaces of the plates 1 in advance of application of an adhesive agent. Further, application, drying and aging of an adhesive agent take time and there has been a need for maintenance operation including careful cleaning of the old adhesive agent off the gasket grooves 10 in advance of adhesion of fresh gaskets 7 to replace the old gaskets 7. Besides this, in the case where heat exchange is effected for fluids for food and medicines, migration of an adhesive agent sometimes becomes a problem. Therefore, it has been desired to fix the gaskets 7 in the gasket grooves 10 of the plates 1 without using any adhesive agent.
According to a known arrangement for attaching the gaskets 7 to the gasket grooves 10 without using any adhesive agent, as shown in FIGS. 11 through 13, fixing tabs 7b are integrally fixed at suitable intervals to the liquid-noncontacted peripheral side surface of the gasket body of a gasket 7 and a fixing projection 7c is integrally fixed to each fixing tab 7b, while the liquid-noncontacted peripheral side surface of each gasket groove 10 of the plate 1 is recessed to form a gasket fixing insertion portion 10a corresponding to said fixing tab 7b and the bottom of said gasket fixing insertion portion 10a is formed with a fitting hole 10b associated with said fixing projection 7c to receive the latter, said fixing projection 7c of said tab 7b being force-fitted in said fitting hole 10b of the fixing insertion portion 10a, thereby fixing the gasket 7 to the gasket groove 10 of the plate 1.
According to the means described above, the fixing of the gasket 7 to the gasket groove 10 of the plate 1 without using any adhesive agent becomes possible, but there has
REFERENCES:
patent: 4377204 (1983-03-01), Johansson
patent: 4635715 (1987-01-01), Andersson
patent: 4905758 (1990-03-01), Mathur et al.
patent: 4995455 (1991-02-01), Mathur
patent: 5070939 (1991-12-01), Mathur
Hisaka Works Limited
Leo L. R.
Rivell John
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