Heat exchange – Flow passages for two confined fluids – Interdigitated plural first and plural second fluid passages
Reexamination Certificate
1999-11-30
2001-06-19
Leo, Leonard (Department: 3743)
Heat exchange
Flow passages for two confined fluids
Interdigitated plural first and plural second fluid passages
C165S178000
Reexamination Certificate
active
06247528
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns a plate heat exchanger for at least two heat exchanging fluids which heat exchanger is permanently joined and comprises at least one core of plates with corrugated heat exchanging plates creating plate interspaces between each other, at least two end plates as well as inlet devices and outlet devices for the heat exchanging fluids.
BACKGROUND OF THE INVENTION
Permanently joined plate heat exchangers are used to an increasing extent. The joining together may be done by brazing but also welding and gluing are used. At a pressure overloading a permanently joined plate heat exchanger leakage will arise and the leakage is generally located to the port areas and/or the circumferential areas of the heat exchanging plates in connection to the inlet and outlet channels. The plate heat exchanger has within the port areas of the plates relatively large projected areas without connecting joints between the heat exchanging plates. Upon these areas forces from pipe loads and fluid pressure are acting. The joints which are situated closest to the port areas of the plates run the risk of being over-loaded and torn up.
U.S. Pat. No. 5,462,113 shows a plate heat exchanger for three fluids. The heat exchanger comprises a core of plates with heat exchanging plates, end plates and inlet devices and outlet devices for the heat exchanging fluids. The attachment of the end plate
12
to the extra sealing plate
16
is wide in comparison with the port channel for the heat exchanging fluid R
1
and will probably contribute to an increased resistance to pressure load. The resistance may still be improved.
SUMMARY OF THE INVENTION
The purpose of the invention is to create a stronger permanently joined plate heat exchanger for at least two heat exchanging fluids. The invention thus comprises a plate heat exchanger for at least two heat exchanging fluids which heat exchanger is permanently joined and contains at least one core of plates with corrugated heat exchanging plates creating plate interspaces between each other, at least two end plates as well as inlet devices and outlet devices for the heat exchanging fluids. Each one of the heat exchanging plates is equipped with at least four port holes creating an inlet channel and an outlet channel through the core of plates for each one of the fluids. At least one of the end plates is equipped with at least one port hole in communication with an inlet channel or an outlet channel. The inlet channels and the outlet channels for a first and a second fluid, respectively, are in fluid communication with a first and a second set of plate interspaces, respectively.
At least one of the mentioned inlet devices and outlet devices comprises both a connection part equipped with a channel and a transition part with an envelope surface and equipped with a channel, the channel in the transition part fluid tightly connecting the channel in the connection part with one of the port holes in one of the end plates. An intersectional line between an imaginary elongation of the mentioned envelope surface in the direction of the generatrix for the envelope surface in every point of contact between the envelope surface and the end plate
5
on one hand and a plane comprising contact areas in the plate interspaces between the two heat exchanging plates that are closest to the transition part in the core of plates on the other hand circumscribes a plurality of connecting points between the mentioned heat exchanging plates.
The present form of execution of a heat exchanger shows due to the wide attachment to the end plate of the transition part in comparison with the port channel a larger pressure durability than before in this exposed area.
REFERENCES:
patent: 5462113 (1995-10-01), Wand
patent: 5630326 (1997-05-01), Nishishita et al.
patent: 5794691 (1998-08-01), Evans et al.
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Blomgren Ralf
Knutsson Anders B
Alfa Laval AB
Fish & Richardson P.C.
Leo Leonard
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