Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to cause rotational flow of fluid
Patent
1990-09-06
1991-10-01
Chambers, A. Michael
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to cause rotational flow of fluid
137810, F15C 116
Patent
active
050524429
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a device for controlling the flow in a pipe system, such as a sewerage system, comprising a housing forming a vortex chamber and being provided with a curved side wall and with an inlet opening and an outlet opening, an inlet gate or throttle being arranged at the inlet opening so that it may occupy at least one operative position, in which it obstructs part of the inlet opening, the inlet gate including a main section and an edge section, which latter in the operative position obstructs part of the inlet opening and is provided with a deflecting surface shaped so that the deflecting surface protrudes laterally from the plane of the main section.
Assemblies of this type are used in pipe systems conveying liquids containing more or less solid bodies and particles. The pipe system may include closed pipes or open drains or combinations thereof as known from sewerage systems, and tanks or other containers may be inserted in the pipe system.
On one hand, there is a demand for controlling the quantities of flowing liquids and, on the other hand, no blocking-up in the assemblies or the pipelines must take place. With respect to prevent the solid bodies and particles from depositing, there should be no narrowings in the flow cross-section area, and if a narrowing cannot be avoided the flow rate there must always be high enough.
When using a vortex chamber for controlling the flow, the well known effect is obtained that, at low flow rates, liquid passes freely through the vortex chamber whereas, at larger flow rates, liquid is braked off due to the fact that the flow in the chamber is caused to follow a vortex forming an air column partially obstructing the outlet opening and exerting at the same time a considerable centrifugal force towards the inlet, thereby providing a high hydraulic resistance against through-flow without physically changing the inlet or outlet opening of the chamber. In other words, the liquid flow may be controlled at the small risk of occluding the pipe system.
PRIOR ART
From GB patent application No. 2 141 561 there is known a vortex chamber which with a view to fine adjustment of the capacity of the chamber makes use of a gate or throttle to vary the inlet cross-sectional area. The gate is enclosed in an upwardly closed intake duct with an inlet disposed at a larger distance from the gate than the vortex chamber. An occlusion by the gate of part of the inlet cross-sectional area has exactly the same effect as if the chamber had been provided with a correspondingly smaller inlet area, and involves a correspondingly higher risk that the inlet cross-section is obstructed by the solid bodies contained in the liquid. Due to the fact that the liquid flowing through the inlet opening has to pass the edge of the intake duct and to change its direction in order to pass through the duct, there is a little pressure drop in front of the gate, thereby exerting a braking effect on the part of the liquid jet that is closest to said vortical edge.
A device of the kind initially referred to is known from WO 85/00446 where the inlet gate is positioned downstream of the inlet gate, that is inside the vortex chamber. The edge section protrudes towards the downstream side of the inlet gate and serves to direct the inflowing water into the tangential direction of the chamber so that a vortex flow will be formed even though the inlet is directed in the axial direction of the chamber.
THE INVENTION
It is a purpose of the invention to provide a device with a larger real inlet cross-section without increasing the water flow quantity so that the risk of occlusion is inferior compared to known devices of the same capacity.
It is a further purpose that the device is easy to operate, easy to inspect and possesses an inherent ability to keep impurities away.
It is an additional purpose that the device has a comparatively large flowing capacity at a low pressure head of the inflow liquid and a comparatively small capacity at a high pressure head of the upstream liquid.
It
REFERENCES:
patent: 905407 (1908-12-01), Butchart
patent: 4206783 (1980-06-01), Brombach
patent: 4679595 (1987-07-01), Johannessen
patent: 4889166 (1989-12-01), Lakatos
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