Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to cause rotational flow of fluid
Patent
1985-02-28
1987-07-14
Chambers, A. Michael
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to cause rotational flow of fluid
1375566, 137808, 239463, 239471, F15C 116
Patent
active
046795952
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for controlling the flow in a pipe system, such as a sewerage system, comprising a housing which is provided with a curved side wall and forms a vortex chamber, and which has an inlet opening and an outlet opening.
It is known from the U.S. Pat. No. 4,206,873 and the Danish Patent Application No. 5120/79 to brake a flow of liquid by passing it tangentially into a housing which has a substantially circular cross-section and forms a vortex chamber. It is common to these vortex brakes that it is a prerequisite for the eddy formation and thus the brake effect that the inlet to the brake housing is tangential to the housing and also substantially perpendicular to the outlet direction. However, a deviation of up to about 60.degree. from the perpendicular or down to an angle of 30.degree. with the axis is acceptable, provided that the wall toward which the inlet is directed is almost perpendicular to the outlet direction.
Within the liquid flow control field there is an increasing need for a more sophisticated control and a less problematic principle of incorporation. By more sophisticated control is meant the possibility of varying the brake effect of the brake housing within a very great interval and of simultaneously maintaining a very large flow cross-section in the control of small amounts. Less problematic principle of incorporation is taken to mean one which allows the brake housing to be inserted in a straight conduit.
The object of the invention is to provide a device of the stated type which satisfies the mentioned need.
This object is achieved by an adjustable guide vane in or opposite the inlet opening, said guide vane being so arranged and mounted as to be movable between an extreme position in which it is positioned substantially outside the inlet region, and operative positions in which it extends more or less across the inlet opening and gives the inflowing liquid a velocity component which forms an angle with the direction to the outlet opening. Then the movable guide vane enables deflection of the inflowing stream of water away from the inlet direction so that, at a certain pressure height at the inlet, the water is caused to follow a vortex path through the housing with a consequent brake effect. The degree of deflection and thus the pressure head where the eddy formation begins can be varied by adjustment of the guide vane. This adjustment can be made at the installation having regard to the actual flow conditions, but can of course always be corrected when the circumstances so demand, e.g. in case of changes in the pipe system in which the device is incorporated.
When the water is caused to rotate in the housing by a sufficiently great pressure head at the inlet, it will be whirled out against the curved side wall under the action of the centrifugal force and with continued inflow be displaced inwardly toward the central axis of the housing, where the number of revolutions increases because the water path per revolution becomes shorter with a decreasing radius. The inner water particles with the large number of revolutions will tend to entrain the most adjacent outside water particles with the same number of revolutions; this effect takes place through the entire body of water out to the periphery and results in a very great overall centrifugal pressure against the curved housing wall and a correspondingly great brake effect. Under these circumstances the water leaves the outlet as a tubular, thin-walled jet.
In practice, the device of the invention may have the shape of either a frustum of a cone and be arranged as stated in claim 2, or of a flat cylinder and be arranged as stated in claim 9.
Expedient details in the two shapes are defined in claims 3-8 and 10-11, respectively.
The invention will be explained more fully below with reference to the drawing, in which
FIGS. 1, 2 and 3 show an embodiment of the device of the invention, seen from the side, from the top and from the inlet end, respectively,
FIG. 4 is a perspective view of a modified embodiment of
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Chambers A. Michael
Jorgen Mosbaek Johannessen ApS
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