Heat exchange – With adjustor for heat – or exchange material – flow – Branched flow
Patent
1987-01-07
1987-09-29
Davis, Jr., Albert W.
Heat exchange
With adjustor for heat, or exchange material, flow
Branched flow
165153, 165166, F28F 702
Patent
active
046963413
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for changing the number of part streams of a flowing medium, comprising a tube with a plurality of holes through the tube wall arranged one after the other in the length direction of the tube, a piston, which divides the interior of the tube into a first compartment, through which the medium is intended to flow, and a second compartment, which is closed from the first compartment, and a piston rod, which extends from the piston through the second compartment and with an end portion extends a distance outside the tube, the number of part streams being determined by the number of holes through the tube wall communicating with the first compartment.
In a device of this kind it is desirable to be able to fix the piston in a simple way in different precise positions along the tube without any need of providing the device with auxiliary components, and without getting any components left over after an accomplished change.
The object of the present invention is to provide a device for changing the number of part streams of a flowing medium, which fulfils this desire and also has a simple and unexpensive design. All parts of the device shall be required for the fixation of the piston in its different positions along the tube.
This object can be obtained by a device of the kind initially mentioned, which according to the invention is provided with:
a first stop member, which is arranged axially displaceable on the end portion of the piston rod extending out from the tube and which is adapted to abut against an end surface of the tube,
a second stop member, which is arranged to keep the first stop member axially pressed against said end surface of the tube, and
a determined number of sleeve members with different axial extension, which are removably applied one after the other around the piston rod within the tube and which together have such an axial extension that they serve as spacing means between the piston and said first stop member, when the latter is pressed against said end surface of the tube by the second stop member, a change of the number of part streams being possible by at least one of the sleeve members being movable to and clampable as a spacing means in a position between the two stop members, and the remaining sleeve members being clampable between the piston and the first stop member.
A device of this kind has the advantage that all the sleeve members have to be in place in order that the device will function, regardless of the number of part streams determined by the position of the piston relative to the tube. Even if the device comprises a great number of sleeve members, there is thus no risk that any of them could get lost.
According to a preferred embodiment of the invention a first compression spring is disposed between the second stop member and a third stdp member, which is releasably connected to the end of the piston rod. By this, an annular gasket can be placed between the piston and the sleeve member situated next to the piston, which annular gasket under the action of the force from the first compression spring is radially expandable to sealing between the piston and the tube. Accordingly, the annular gasket should be dimensioned such that in an unexpanded state it will not counteract a relative displacement between the piston and the tube. By this, it is also avoided that the annular gasket would be damaged when passing the tube holes, since in its unexpanded state it can not penetrate into these holes.
The said first compression spring guarantees that the annular gasket slways will be expanded to seal satisfactorily between the piston and the tube, no matter if the annular gasket after a time of use is permanently deformed or has changed in dimension because of ageing for instance.
In a special application of the invention the tube extends through aligned holes in heat exchange plates, which are releasably held together between a first and a second frame plate. Then the tube holes, which coamunicate with said first compartment of the tube i
REFERENCES:
patent: 403936 (1889-05-01), Halsey
patent: 3047274 (1962-07-01), Wilson
patent: 3150028 (1964-09-01), Wennerberg
patent: 3976128 (1976-08-01), Patel et al.
patent: 4162703 (1979-07-01), Bosaeus
Bolmstedt Ulf
Johansson Bjorn-Olow
Alfa-Laval Food and Dairy Engineering AB
Cole Richard R.
Davis Jr. Albert W.
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