Fluid handling – Processes – Cleaning – repairing – or assembling
Patent
1981-02-11
1983-07-05
Walton, George L.
Fluid handling
Processes
Cleaning, repairing, or assembling
4380, 137236R, 137238, 137205, 134116C, 417 12, 417316, E03D 100, B08B 302
Patent
active
043912885
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method for effecting rinsing of an inverted siphon, which forms part of a sewer, and a device for performing the method.
2. Description of the Prior Art
Sewers and the like, which pass under a water course or another similar obstacle are often provided with a so called inverted siphon, i.e., a conduit which mainly in U-shape extends below the inclination line of the sewer. The inverted siphon is continuously filled with water and if the water velocity therethrough is low there is a big risk that it will be gradually silted up. Self-rinsing of inverted siphons is obtained at a certain flow velocity which is named the rinsing velocity and is dependent on the dimensions of the conduit. In the smallest inverted siphons which are generally used a water volumetric flow of about 16 l/s is required for reaching the rinsing velocity and this corresponds to the sewage volume from 300-400 small houses during the maximum period of use.
In cases where the built-up areas are smaller, which is very common, it is thus not possible to reach the criteria which are necessary for obtaining self-rinsing inverted siphons, and therefore conventional sewage pumping stations are used for giving the water a sufficient velocity through the inverted siphon to achieve rinsing. Such a pumping station is however comparatively expensive both to build and to run and it furthermore gives rise to problems for if there is any stoppage it will spill over and contaminate the receiving body of water which has often a very low discharge.
BRIEF SUMMARY OF THE INVENTION
The purpose of the present invention is to offer a simple and reliable method of effecting rinsing of the inverted siphon when the head of the discharge is low and at insufficient volumetric flow without the use of a sewage pumping station and without encountering the disadvantages mentioned hereabove and this is according to the invention achieved by arranging upstream of the inverted siphon a fluid reservoir having a reservoir volume which at least corresponds to the volume of the siphon for the length thereof requiring rinsing and by temporarily and for a short period of time at least one every twenty-four hours, giving the fluid content of the reservoir a flow velocity through the inverted siphon, which at least corresponds to the required rinsing velocity for removing sludge which has accumulated in the inverted siphon.
The invention is also in a device for accomplishing the method and this device is mainly characterized by a fluid reservoir arranged upstream of the inverted siphon having a reservoir volume between a normal pressure head curve and the least inclined pressure head curve required for maintaining the required rinsing velocity and means adapted to cause the content of the fluid reservoir to be emptied through the inverted siphon during a short period of time and at a velocity at least corresponding to the required rinsing velocity.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will hereinafter be further described with reference to the embodiment shown in the accompanying drawings wherein;
FIG. 1 is a schematic cross-sectional a view showing device for performing the method according to the invention,
FIG. 2 is a schematic detail view of part of the device according to the invention, and
FIG. 3 is a schematic circuit diagram showing an embodiment of the driving and control system of the device.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1 is shown in schematic cross section a sewer conduit 1 having a pressure head curve 2 and where it passes beneath a crossing water stream 3 is equipped with an inverted siphon 4. The waste water flows through the conduit at a speed and at a pressure head curve, which is determined by the approaching flow and by the inverted siphon material, appearance and dimension.
Upstream of the inverted siphon 4 there is arranged at a higher level than the sewer lines 1, 1a a fluid reservoir 5, which has a volume that corresponds to a wate
REFERENCES:
patent: 261080 (1882-07-01), Comstock et al.
patent: 287811 (1883-11-01), Dougine
patent: 685902 (1901-11-01), Bell
patent: 1495303 (1924-05-01), Heidelberg
patent: 2681177 (1954-06-01), Hartwell
patent: 3211167 (1965-10-01), Cliff et al.
patent: 3702744 (1972-11-01), Brown et al.
patent: 4285359 (1981-08-01), Doherty
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