Heat exchange – With solids separator for exchange fluid
Patent
1998-11-13
2000-08-22
Flanigan, Allen
Heat exchange
With solids separator for exchange fluid
210184, 165916, F28F 1900
Patent
active
061056642
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a filter and heat exchanger device of the kind comprising: a substantially cylindrical housing having an inlet port and an outlet port for a primary liquid and an inlet port and an outlet port for a secondary liquid; a tubular heat exchanger body disposed in the housing and having fins on the outer side thereof and an axial through passageway which communicates with the inlet port and the outlet port for the secondary liquid; and a cylindrical partition in the housing, said partition defining on one side thereof a heat exchanger compartment which accommodates the heat exchanger body and defining on the other side thereof a filter compartment which accommodates a filter body, and the heat exchanger compartment and the filter compartment communicating with one another and forming successive sections of a primary-liquid flow path extending between the inlet and outlet ports for the primary liquid.
The primary liquid is a liquid which is to be filtered and cooled or heated and may be oil, for example, while the secondary liquid is a cooling or heating liquid and may be water, for example.
Filter and heat exchanger devices of this kind are often used for filtering and cooling of various working liquids, such as lubricating or transmission oil in automotive vehicles and other systems powered by internal combustion engines, hydraulic fluid in oil-hydraulic systems, or liquids in other machines or systems in which the liquid requires both filtering and cooling. An example of a filter and heat exchanger device in which a liquid is filtered and cooled in a single unit is disclosed in WO88/06228.
As is typical of known filter and heat exchanger devices of this kind, the tubular filter body of the filter and heat exchanger device disclosed in WO88/06228 is disposed inside the tubular heat exchanger body. This relative position of the filter and heat exchanger bodies is advantageous in that the heat exchanger body can be provided with as large heat transfer surfaces as the diameter of the housing of the device permits; this is desirable in most cases. On the other hand, this relative position does not allow of full utilization of the available space in the housing.
An object of the invention is to provide a filter and heat exchanger device of the kind indicated which is improved in respect of the utilization of the space. This object is achieved by the heat exchanger design defined in the independent claim. Features of preferred embodiments of the filter and heat exchanger device according to the invention are set forth in the dependent claims.
As will be described in greater detail below, the heat exchanger body of the filter and heat exchanger device according to the invention is positioned inside the filter body, and the primary liquid flows circumferentially about the heat exchanger body between axially elongate and circumferentially spaced-apart inlet and outlet passages extending through the cylindrical partition which separates the heat exchanger body from the filter body.
The arrangement according to the invention provides for an efficient heat transfer and allows a heat exchanger body of small diameter to be used without reducing the heat transfer capacity in comparison with that of known heat exchanger devices. A particularly efficient heat transfer will be achieved if the heat exchanger body is constructed in accordance with the principles explained in WO86/00395. An additional substantial advantage is that the primary-liquid pressure acting on the upstream side of the heat exchanger body--this pressure may be 10-15 bar in many applications--acts on the outer side of the heat exchanger body. This pressure is thus directed towards the centre of the heat exchanger body and consequently subjects the heat exchanger body to radial compression, rather than tending to expand the heat exchanger body. The heat exchanger body can therefore be made from a material which is of low tensile strength but is favourable in respect of the heat transfer properties, such as aluminium, without consequen
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patent: 3315737 (1967-04-01), Welch
patent: 5435346 (1995-07-01), Tegidgo et al.
patent: 5948248 (1999-09-01), Brown
patent: 5967111 (1999-10-01), Hedman
Gillbrand Per
Ohman Richard
Flanigan Allen
Interproperty N.V.
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