Heat exchange – With repair or assembly means – Guide
Patent
1988-06-28
1989-10-17
Lazarus, Ira S.
Heat exchange
With repair or assembly means
Guide
165167, F28F 308
Patent
active
048740390
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a plate heat exchanger comprising a frame plate and a pressure plate and heat exchange plates clamped therebetween, which heat exchange plates are suspended from a carrying bar passing through a hole in the pressure plate and extending at least a distance into a corresponding hole in the frame plate.
A plate heat exchanger comprises, as mentioned, a frame plate and a pressure plate, which usually are termed end plates, and heat exchange plates arranged between these. Further, the plate heat exchanger comprises an upper carrying bar, in which the heat exchange plates are suspended, and usually a lower guiding bar, which also is intended to cooperate with the heat exchange plates for determining their positions. The frame plate and the pressure plate differ as a rule from each other referring to their design. Thus, the frame plate may as an example be provided with four ports, two for each heat exchange medium, while the pressure plate thus would not need to have any single port. Another essential difference between the frame plate and the pressure plate is that the sizes of the holes for the carrying bar and the guiding bar are unequal. The reason hereto is that the carrying bar and the guiding bar are intended to be fastened to the frame plate, while the pressure plate should be slidable towards and backwards along these bars, depending on the amount of heat exchange plates mounted between the frame plate and the pressure plate. Thus, it has been usual that the pressure plate has been provided with a hole for the carrying bar and the guiding bar having a diameter somewhat larger than the diameter of the carrying bar and the guiding bar, while the frame plate, however, has had a smaller hole which has been threaded and lain in engagement with a threaded outer part of the carrying bar to fasten the same to the frame plate. Another known method to fix the carrying bar and the guiding bar to the frame plate has been to fasten these by means of a bolt. The carrying bar and the guiding bar have thus with their one end surface been borne against the inner side surface of the frame plate and been fixed in this position by means of a bolt which has gone through a hole in the frame plate, which hole corresponds to the thickness of the bolt, and has engaged into the carrying bar and the guiding bar.
The consequences of these differences between the frame plate and the pressure plate has lead to that the manufacturer of plate heat exchangers has been forced to have a stock of both frame plates and pressure plates, which is both expensive and taking up a great deal of storage space.
The problem with an equal number of ports in the frame plate and the pressure plate can be solved in the way that all of the frame plates and the pressure plates being provided with four ports, whereafter the ports, which will not be used, are provided with caps. This technique to provide the ports with caps is previously known, but despite that, nobody has previously suggested a plate heat exchanger being provided with a frame plate and a pressure plate identically manufactured. The reason hereto obviously has been that one has had such a fixation on the thought that it requires conventional fastening according to the above of the carrying bar and the guiding bar, that one has not thought of the possibility to make the holes for the carrying bar and the guiding bar identical in the frame plate and the pressure plate. That one has not thought of the possibility of making the frame plate and the pressure plate identical is shown by the fact that despite that plate heat exchangers have existed on the market in at least 60 years nobody has previously suggested this solution. The present invention is thus characterized in that the frame plate and the pressure plate are identical so that the hole for the carrying bar in the frame plate is identical to the hole for the carrying bar in the pressure plate and that the carrying bar is fastened in the frame plate by means of a locking device.
This implies that for eac
REFERENCES:
patent: 2287958 (1942-06-01), Astle
patent: 2428880 (1947-10-01), Kintner
patent: 4499942 (1985-02-01), Allison
Bond, Plate Heat Exchangers, U.K. Patent Applications, 12/1980.
Usher, Improvements in or Relating to Plate Heat Exchangers, U.K. Patent Applications, 9/1980.
Alfa-Laval Thermal AB
Hayes Christopher
Lazarus Ira S.
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