Heat exchange – With repair or assembly means – Guide
Patent
1987-09-04
1989-03-21
Yeung, James C.
Heat exchange
With repair or assembly means
Guide
165166, 165167, F28F 700
Patent
active
048134783
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a plate heat exchanger having two end plates, i.e. a frame plate and a pressure plate, and heat exchange plates clamped between the two end plates by fastening means positioned on different levels on the end plate and intended to go through holes or recesses in the end plates, each of the end plates having two essentially horizontal sides and two essentially vertical sides and a vertical center line.
A plate heat exchanger comprises a frame provided with a frame plate and a pressure plate (the so-called end plates of the frame) between which a plurality of heat exchange plates are clamped. These heat exchange plates are suspended in the frame by a carrying bar extending between the end plates in the upper part of the frame and a guide bar extending between the end plates in the lower part of the frame. The heat exchange plates are clamped between the end plates by fastening means engaging with holes or recesses in the end plates, which holes and recesses, as a rule, are symmetrically located in these plates. Each fastening means usually comprises a long bolt extending over the whole length of the plate package and co-operating with a nut, the bolt head resting against the frame plate, while the nut is tightened against the pressure plate.
When clamping the plate package between the frame plate and the pressure plate, the latter, by being provided with openings at its upper and lower parts for the carrying bar and the guide bar of the frame, can slide upon these bars and force the plate package against the frame plate which is fastened to the frame.
When forcing the plate package together the number of bolts are adapted to that force with which the plate package shall be tightened and to the medium pressure for which the frame is suited. It has often been so that with regard to the geometry of the end plates and to the symmetrically located holes and recesses in these plates, the number of bolts has been overdimensioned, which has resulted in unnecessary expenses in the form of extra bolts and an unnecessary machining of the end plates. Moreover, the weight of the frame has become unnecessarily high.
This invention aims to remove the problems connected with known technique. That has been brought about by a plate heat exchanger of the kind mentioned by way of introduction which is characterized in that the plate heat exchanger has only one fastening means at the upper horizontal side of the end plate going through a hole or a recess on one side of the vertical center line of the end plate and only one fastening means at the lower horizontal side of the end plate going through a hole or a recess on the other side of the vertical center line of the end plate such that a line drawn between these two fastening means would extend diagonally over the end plate and that the plate heat exchanger has at least one fastening means at each of the two vertical sides of the end plate so located that the uppermost fastening means at one of two vertical sides on the same side of the vertical center line of the end plate as the fastening means at the lower horizontal side of the end plate is closer to the upper horizontal side of the end plate than the uppermost fastening means at the other vertical side on the same side of the vertical center line of the end plate as the fastening means at the upper horizontal side of the end plate.
The invention shall be described more closely with reference to the accompanying drawings, in which:
FIG. 1, 2 disclose two known embodiments of a pressure plate,
FIG. 3-6 disclose four different embodiments of a pressure plate according to the invention, and
FIG. 7 shows a plate heat exchanger in accordance with the new invention.
As mentioned previously, FIG. 1 shows known technique, in this case a pressure plate which at its upper and lower parts is provided with central openings 1, 2 for the carrying bar and the guide bar. The pressure plate is further provided with eight holes 3 at the edges of its long sides. In this connection each long side is provided with four
REFERENCES:
patent: 2610834 (1952-09-01), Dalzell
patent: 3334399 (1967-08-01), Teeguarden
patent: 4398591 (1983-08-01), Bond
patent: 4499942 (1985-07-01), Allison
Jonsson Nils-.ANG.ke
Rissler Per
Alfa-Laval Thermal AB
Yeung James C.
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