Heat exchange – With repair or assembly means – Guide
Patent
1998-06-18
1999-11-30
Leo, Leonard
Heat exchange
With repair or assembly means
Guide
165167, F28F 308
Patent
active
059925108
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION AND PRIOR ART
The present invention refers to a plate heat exchanger comprising heat transfer plates provides with port holes, said plates being compression-moulded relative to a reference plane, and permanently joined to each other, for instance by brazing, to a plate package in such a manner that heat transfer passages are formed between adjacent heat transfer plates and at least one port hole channel is formed through said package by said port holes, wherein the heat transfer plates through said compression-moulding have been provided with contact portions which through said permanent joining of the plate package form areas of the plate package that lack any connection to said heat transfer passages.
Such brazed plate heat exchangers are used in a wide variety of applications, e.g. as oil coolers for vehicle engines. Problems occur when the plate heat exchanger is to be attached for instance to an engine or connection pipes with regard to the sealing between the plate heat exchanger and said engine or connection pipes around the port hole channels of the heat exchanger. Frequently, it is necessary to use further space requiring components, for instance brackets having a mounting loop to be tightened around the plate heat exchanger. Furthermore, it is possible to attach the plate heat exchanger by means of screws screwed into threaded holes in an end plate of the plate heat exchanger. Thereby, the end plate has to be more rigid and thicker than otherwise would have been the case. Besides the fact that these previously known methods of attaching a plate hear exchanger involve the use of many further components, these methods also involve a time-consuming and labour-intensive mounting.
WO-A-9 417 354 discloses a plate heat exchanger having a stack of heat transfer plates clamped together by means of tie bars extending laterally of the heat transfer plates between two end plates. The area carrying the heat transfer medium between the heat transfer plates is sealed off by means of gaskets. Thus, by means of these gaskets heat transfer medium is prevented from penetrating an area near the periphery of the plates and in this area cut-outs have been made for tie bars and for rails by which the heat transfer plates may be suspended.
GB-A-2 208 005 discloses a similar plate heat exchanger having heat transfer plates clamped between two end plates and a small detection aperture in the periphery of the heat transfer plates outside the heat transfer area in order to detect a leakage in this area.
GB-A-1 275 711 discloses a similar plate heal exchanger having heat transfer plates clamped between two end plates and a small detection aperture in the periphery of the heat transfer plates outside the heat transfer area. In this aperture, being asymmetrically positioned, a thin bar is introduced to assure a proper orientation of the heat transfer plates during the mounting.
U.S. Pat. No. 4,249,597 discloses a plate heat exchanger of another type having heat transfer plates brazed together in pairs. Thereafter, such pairs are stacked together and not brazed but clamped together by means of two bolts extending through the heat exchange plates, in order to provide a plate heat exchanger having double walls between the heat transfer passages.
GB-A-1 204 004 discloses a brazed plate heat exchanger comprising a package of heat transfer plates provided between enclosing casing parts. Furthermore, the heat exchanger comprises two locating pins provided in holes extending through the heat exchanger and functioning to position the different parts properly during the brazing process. During the brazing process the parts are drawn together by means of clips, whereafter all parts, i.e. the heat transfer plates, the casing parts and the locating pins, are heated and brazed together. In order to locate inlet and outlet pipes at the plate heat exchanger, a clip may be brazed to at least one of the casing parts.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a plate heat exc
REFERENCES:
patent: 2648527 (1953-08-01), Carnahan
patent: 4249597 (1981-02-01), Carey
patent: 4872578 (1989-10-01), Fuerschbach et al.
patent: 5307869 (1994-05-01), Blomgren
Alfa Laval AB
Leo Leonard
LandOfFree
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