Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1994-06-03
1995-10-31
Walton, George L.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137112, 137426, 137438, 137448, 137616, 405 39, 405 96, F16K 3124, F16K 3300
Patent
active
054620759
DESCRIPTION:
BRIEF SUMMARY
The sewage disposal system in practically all populated areas can functionally be regarded as combined systems, i.e. surface water in the form of for example rain and waste water is transported in the same pipe. Thus the flow in the pipes and the sewage system can markedly increase and exceed the capacity of the sewage system or the sewage treatment plant in case of for example heavy rain. Water has then to be diverted without actual sewage treatment, i.e. being overflowed.
Since an actual control of the flow in the sewage pipes does not exist the overflow occurs without control and wastewater may reach small waters which can be very sensitive to this discharge. A considerable increase in flow in the form of shock load may also cause large problems at sewage plants. The sedimentation and the nitrogen purification are for example affected by disturbances during heavy sludge escape which takes place if the flow is too large.
By controlling the flow by means of devices for flow control at suitable points in the sewage system in order to vary the flow between zero flow and the full capacity of the pipes the flow can be adjusted or directed in a controlled way to for example a depot. Then overloading in both sewage systems and sewage treatment plants can be avoided and very large environmental and economical effects and advantages can be achieved.
In order to avoid large flows in surface water pipes, for example after a cloud burst, devices have previously been suggested which comprise a well or a tank in which some kind of suction siphon is disposed. Since the flow through the suction siphon is limited a control of the outgoing flow from the well or the tank is effected. Such a process and such a device is shown and described in SE-B 370 430. Similar devices which make use of whirl chambers have also previously been used for flow control. It is also possible to mechanically control all orifices or spillways manually or by means of a engine. An exactly controlled flow from devices which work in this way with pipe or orifice openings or by means of spillway is achieved by varying the area of the orifice or the height of the spillway dependent on the pressure head. This is, however, complicated and requires complicated control devices. The outflow of whirl chambers is also controlled by the static pressure head and when the pressure head is varying it is not possible to keep the outflow constant.
One purpose of the present invention is to achieve a method and a device for flow control, the flow control being controlled independent of the pressure head in the liquid supplying tubes. Flow control should take place automatically in dependence on the liquid level without any help from engines or the like.
This purpose is achieved by the invention having obtained the characterizing features of claim 1 and 3, respectively.
Further advantages are achieved with further developments of the invention, which are defined in the independent claims.
The inventions will now be further described by means of embodiments, reference being made to the accompanying drawings in which
FIG. 1 is a side view partly in cross section of the device according to the invention,
FIG. 2 is a cross sectional view along the line II--II in FIG. 1,
FIG. 3 is a cross sectional view along the line III--III in FIG. 1,
FIG. 4 is a side view partly in section of the device according to the invention at a slightly raised water level in relation to FIG. 1-3,
FIG. 5 is a cross sectional view along the line V--V in FIG. 4,
FIG. 6 is a cross sectional view along the line VI--VI. in FIG. 4,
FIG. 7 is a side view partly in section of the device according to the invention with maximal raised water level,
FIG. 8 is a cross sectional view along the line VIII--VIII in FIG. 7,
FIG. 9 is a cross sectional view along the line IX--IX in FIG. 7,
FIG. 10 is a simplified side view of an alternative embodiment according to the invention at low water level,
FIG. 11 is a simplified cross sectional view along the line XI--XI in FIG. 10,
FIG. 12 is a simplified side view part
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Mason, Jr. Joseph C.
Smith Ronald E.
Walton George L.
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