Pumps – One fluid pumped by contact or entrainment with another – Liquid pumped by supplying or exhausting gaseous motive...
Reexamination Certificate
1999-04-07
2001-03-27
Michalsky, Gerald A. (Department: 3753)
Pumps
One fluid pumped by contact or entrainment with another
Liquid pumped by supplying or exhausting gaseous motive...
12
Reexamination Certificate
active
06206647
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a waste water disposal system comprising waste water connections which are connected to a number of collecting spaces via supply pipes, a discharge pipe connected to said collecting spaces, a pressure pipe comprising a compressed air source, which is connected to said collecting spaces, and a control system for selectively emptying said collecting spaces into the discharge pipe by introducing compressed air into the collecting spaces via said pressure pipe.
2. Description of the Prior Art
Such a waste water disposal system configured as a sewage system is for example known from U.S. Pat. No. 5,549,016. With this known sewage system an air compressor is connected to one of the collecting spaces via the pressure pipe. The collecting space is furthermore connected to a next collecting space via the discharge pipe, and in this manner the collecting spaces are connected in series, with the discharge pipe running from the last collecting space in the series connection to a discharge point. When one of the collecting spaces is filled to a predetermined level, the compressor or other compressed air source are turned on and all collecting spaces are emptied.
The object of the invention is to further improve this known waste water disposal system.
SUMMARY OF THE INVENTION
In order to accomplish that objective the waste water disposal system according to the invention is characterized in that the pressure pipe and the discharge pipe are separate pipes, and that the collecting spaces are interconnected in parallel between the pressure pipe and the discharge pipe, to which they are connected via connecting pipes.
As a result of this parallel-connection of the collecting spaces relative to the pressure pipe and the discharge pipe a more reliable system featuring a reduced energy consumption is obtained. Said reliability is achieved in that one collecting space may exhibit a defect when a parallel arrangement is used, whilst it will still be possible in that case to empty the other collecting spaces. The energy consumption can be reduced since it can be arranged that only a collecting space which is filled to said predetermined level will be emptied.
In order to arrange in a simple manner that only one collecting space will be emptied, the invention proposes to incorporate a non-return valve in the connecting pipe between each collecting space and the discharge pipe, which non-return valve closes in the direction of the collecting space. In this manner it is also possible to prevent the occurrence of a pressure loss in the discharge pipe. To that end it is furthermore advantageous that the non-return valves are closed in the position of rest and that they will only open when pressure is supplied from the associated collecting space.
The individual emptying of the collecting spaces can in particular be practically realised when each collecting space has an air valve connected to the control system incorporated in the connecting pipe on the side of the pressure pipe, whilst the control system is arranged for individually operating the various air valves.
It is noted that each collecting space may be fitted with its own air valve, but that is also possible for several collecting spaces to be provided with one common air valve.
Furthermore it is conceivable to maintain a constant overpressure in the pressure pipe, whilst it is also possible to build up pressure in the pressure pipe anew each time a collecting space is to be emptied.
Another advantage of the waste water disposal system according to the invention is that it allows a greater freedom of design. Thus it is no longer necessary to dispose the compressed air source at the beginning of a series arrangement. It is possible to disposed a compressed air source at a random location in the pressure pipe according to the invention, whilst it is also possible to connect several compressed air sources to one pressure pipe. Also the discharge pipe may be provided with a discharge point at a random location, whilst it is also conceivable to provide several discharge points.
The invention will be explained in more detail hereafter with reference to the drawing, which shows a waste water disposal system according to the invention in the form of a sewage system.
REFERENCES:
patent: 2180274 (1939-11-01), Bentley
patent: 2300039 (1942-10-01), Yeomans et al.
patent: 2383834 (1945-08-01), Yeomans
patent: 2669941 (1954-02-01), Stafford
patent: 2817299 (1957-12-01), Weis
patent: 2899908 (1959-08-01), Nemecsek
patent: 3049489 (1962-08-01), Ciabattari
patent: 3253547 (1966-05-01), Weis
patent: 4184506 (1980-01-01), Varis et al.
patent: 5449016 (1995-09-01), Van Baar
patent: 27214 (1884-05-01), None
patent: 136603 (1919-12-01), None
Keijts, Compressor blasst riool in korte tijd leeg,Land&Water, vol. 32, No. 11, Nov. 1992, Amsterdam, pp. 73-75.
Intelligent Environmental Systems, B.V.
Knoble & Yoshida LLC
Michalsky Gerald A.
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