Heat exchange – With adjustor for heat – or exchange material – flow – Branched flow
Patent
1998-04-08
1999-09-14
Leo, Leonard
Heat exchange
With adjustor for heat, or exchange material, flow
Branched flow
165167, 165297, F28F 2702
Patent
active
059507152
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a plate heat exchanger, which comprises several plates arranged so that they form a plate package having plate interspaces and in which
the plates have through openings forming an inlet channel and an outlet channel through the plate package for liquid,
certain of the plate interspaces form first flow passages for said liquid and other plate interspaces form second flow passages for a fluid, which upon through flow of said second flow passages gives off heat to or receives heat from said liquid--through at least some of said plates--when the liquid flows through said first flow passages, and
said inlet channel communicates with said outlet channel through said first flow passages.
BACKGROUND OF THE INVENTION
Plate heat exchangers of this kind are well known and are utilized in many different connections.
Sometimes it is desired that part of a liquid to be heat treated is by-passed a plate heat exchanger. In such a case a tubular connection is usually connected outside the plate heat exchanger between its inlet and its outlet for said liquid, a valve being arranged to direct a larger or smaller part of the liquid arriving at the plate heat exchanger through said tubular conduit. If desired, a valve of this kind may be adapted to direct the whole of the liquid flow through either the plate heat exchanger or the conduit. An arrangement of the kind just described is shown for instance in EP-O 122 133-B1.
A conduit of the kind just described requires, however, a relatively large space outside the plate heat exchanger and brings with it additional costs for its connection to the plate heat exchanger inlet and outlet conduits.
It is previously known, e.g. through EP-O 316 510-B1, to make arrangements within a plate heat exchanger for a by-pass flow of a certain part of the liquid supplied to the plate heat exchanger. However, in such a known arrangement a separate casing surrounding the package of heat exchanging plates is necessary. This means that the plate heat exchanger becomes substantially more expensive than if the casing could be dispensed with. In the known arrangement according to EP-O 316 510-B1 it is further impossible to pump said liquid into the plate heat exchanger by a high pressure, since the by-passing of part of the liquid is intended to take place through an overflow outlet within said casing.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a plate heat exchanger of the initially defined kind, which has a relatively unexpensive arrangement for by-passing at least part of the liquid supplied to the plate heat exchanger, so that this part of the liquid is not subjected to, or subjected only to a small degree, to heat treatment within the plate heat exchanger.
This object can be fulfilled according to the invention in a way such that said first flow passages comprise several heat exchange passages, which are adapted for an effective heat transfer between said liquid and said fluid and which are shaped such that each one of them gives a certain flow resistance for through flow of said liquid, and also at least one by-pass passage, which is adapted for a less effective or no heat transfer between said liquid and said fluid and which is shaped such that it gives a flow resistance substantially smaller than that given by each one of said heat exchange passages, and that at least one valve member is arranged movable between different positions to make possible obtainment of a desired liquid flow through the by-pass passage.
A by-pass passage of the kind here defined can be arranged in any desired part of said plate package. Preferably, the by-pass passage is formed in one of the outermost plate interspaces in the plate package, i.e. one end plate of the plate package is used to delimit the by-pass passage. A plate package end plate of this kind is often completely planar, i.e. it is not as the real heat transfer plates provided with tubulence generating corrugations or the like. Thereby, the distance between the
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patent: 4696341 (1987-09-01), Bolmstedt et al.
patent: 4993367 (1991-02-01), Kehrer
Blomgren Ralf
Jonsson Nils-.ANG.ke
Kallrot Magnus
Alfa Laval AB
Leo Leonard
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