| Title of Invention | VACUUM-OPERATED TOILET |
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| Abstract | The invention relates to a vacuum-operated toilet comprising a WC bowl, a vacuum generator, a collection container; conduits containing valves and an intermediate container that is located between the WC bowl and the collection container and composes an inlet valve and an outlet valve. The respective housings of the inlet valve (11) and the outlet valve (12) are connected to a pressure source. |
| Full Text | 1 Vacuum-operated toilet and method for the operation of a vacuum toilet The invention relates to a vacuum-operated toilet comprising a WC bowl, a vacuum generator, a collection container, conduits containing valves and an intermediate container, which is Located between the WC bowl and the collection container and comprises an inlet valve and an outlet valve, as well as a method for the operation of such a vacuum toilet. A so-called vacuum toilet system and the operation of such a system are described for example in DE 37 28 157 A1. The system disclosed therein is intended for use in particular in mobile units, such as trains and busses. The following components ate included in the system described therein: A WC bowl, a device for generating a vacuum, a collection container, conduits comprising valves and an intermediate container located between the WC bowl and collection container. The procedure used in the method described above is as follows: A negative pressure is produced in the intermediate container by the device for generating a vacuum, which can be an ejector connected to a pressurised air container. A respective valve is provided in front of and behind the intermediate container, which can be opened pneumatically. After actuation of a flush button, a negative pressure is produced in the intermediate container and flushing water is passed into the WC bowl. When the valve arranged in front of the intermediate container is open, flushing water and facces are sucked out of the WC bowl, which is under atmosphere 2 pressure, into the intermediate container due to the pressure gradient. Thereafter, with closed valves, the intermediate container is put under positive pressure and upon opening of the valve arranged behind the intermediate container, the contents of the intermediate container is discharged into the collection container. When pressure is build up in the intermediate container, the waste water is located also inside of the intermediate container and is pressed also into the housings of the valves, if the seals of the inlet and outlet valves are leaking or worn, which can result in deposits and also, after a certain period of time, in the failure of the valves. Furthermore the situation can arise that, while one of the valves is opened, the housing space is simultaneously accessible for a short time and the waste water penetrates into the housing. The present invention seeks to avoid this penetration of waste water into the valve housings, and this is achieved in a vacuum-operated toilet of the type indicated above in that the housings of the inlet valve and the outlet valve are connected to one or each to a respective source of pressure medium and that the pressure in the housings is higher than that in the intermediate container, when the pressure is build up there in order to convey the discharge mass into the collection container. The source of pressure medium can also be connected with the sides of the valves facing away from the intermediate container. The invention also relates to a method for the operation of a vacuum toilet comprising a WC bowl, a vacuum generator, a 3 collection container, conduits containing valves and an intermediate container, which is located between the WC bowl and the collection container and comprises an inlet valve and an outlet valve, wherein the inlet valve housing and the outlet valve housing are kept under higher pressure than that of the intermediate container, when pressure is build up therein. It is obvious to achieve by means of the design according to the invention that no deposits can form inside of the valve housings, which results in an extension of the service life of the valves. The invention is described below by way of example with reference to the drawing. The only figure of the drawing shows a part of a vacuum- operated toilet according to the invention. In the figure, 10 indicates the intermediate container, which is located in flow direction between a bowl 19 and the sewer line, or a collection container 20, respectively. This intermediate container 10 is closed off by valves on both sides, that is by the inlet valve 11 and the outlet valve 12. These are slide valves or pinch valves. The housings of both valves 11 and 12 are shown connected with a pressurised air conduit and the addition Pg is intended to point out that a pressure is applied here, which is higher than that in the intermediate container 10, when a pressure to convey the discharge mass is build up there. 4 Thus, when pressure P is build up in the intermediate container, pressurised air Pg is applied to the housings of the valves 11 and 12 simultaneously such that through these "clean" pressurised air is passed starting from the valves into the intermediate container 10, such that not discharge mass can accumulate there and the valves remain "clean", whereby the service life of the valves and of the complete System is increased. In a preferred embodiment of the invention, the required pressure Pg can also be derived from the pressure P, which becomes effective in the intermediate container 10. 5 AMENDED CLAIMS (received by the International Bureau on 23 November 2005 (23.11.2005); original claim 1 replaced by amended claim 1; claims 2-3 unchanged.) Claims 1. Vacuum-operated toilet comprising a WC bowl, a vacuum generator, a collection container, conduits (19, 20) containing valves and an intermediate container (10), which is located between the WC bowl and the collection container and comprises an inlet valve and an outlet valve (11, 12), characterised in that the housings of the inlet valve (11) and the outlet valve (12) are connected to one or each to a respective source of pressure medium and that the vacuum- operated toilet is suited to produce a higher pressure in the housings of the inlet and outlet valve in the intermediate container (10), when the pressure for conveying the discharge mass into the collection container (20) is build up inside of the intermediate container. 2. Vacuum-operated toilet according to claim 1, characterised in that the source of pressure medium (Pg) is connected with the side of the valves (11, 12) facing away from the intermediate container (10). 3. Method for operation of a vacuum toilet comprising a WC bowl, a vacuum generator, a collection container, conduits containing valves and an intermediate container, which is located between the WC bowl and the collection container and comprises and inlet and an outlet valve, characterised in that housings of the inlet valve (11) and the outlet valve AMENDED PAGE 6 (12) are kept under higher pressure than that of the intermediate container (10), when pressure is build up inside of the intermediate container. AMENDED PAGE The invention relates to a vacuum-operated toilet comprising a WC bowl, a vacuum generator, a collection container; conduits containing valves and an intermediate container that is located between the WC bowl and the collection container and composes an inlet valve and an outlet valve. The respective housings of the inlet valve (11) and the outlet valve (12) are connected to a pressure source. |
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00409-kolnp-2006-description complete.pdf
00409-kolnp-2006-international publication.pdf
00409-kolnp-2006-pct forms.pdf
00409-kolnp-2006-priority document.pdf
409-KOLNP-2006-CORRESPONDENCE.pdf
409-KOLNP-2006-FORM-27-1.1.pdf
409-kolnp-2006-granted-assignment.pdf
409-kolnp-2006-granted-claims.pdf
409-kolnp-2006-granted-correspondence.pdf
409-kolnp-2006-granted-description (complete).pdf
409-kolnp-2006-granted-drawings.pdf
409-kolnp-2006-granted-examination report.pdf
409-kolnp-2006-granted-form 1.pdf
409-kolnp-2006-granted-form 18.pdf
409-kolnp-2006-granted-form 3.pdf
409-kolnp-2006-granted-form 5.pdf
409-kolnp-2006-granted-gpa.pdf
409-kolnp-2006-granted-reply to examination report.pdf
409-kolnp-2006-granted-specification.pdf
| Patent Number | 235099 | |||||||||
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| Indian Patent Application Number | 409/KOLNP/2006 | |||||||||
| PG Journal Number | 26/2009 | |||||||||
| Publication Date | 26-Jun-2009 | |||||||||
| Grant Date | 24-Jun-2009 | |||||||||
| Date of Filing | 23-Feb-2006 | |||||||||
| Name of Patentee | EVAC GMBH | |||||||||
| Applicant Address | HAFENSTRASSE 32a, 22880 WEDEL, GERMANY | |||||||||
Inventors:
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| PCT International Classification Number | E03F 1/00 | |||||||||
| PCT International Application Number | PCT/EP2005/006916 | |||||||||
| PCT International Filing date | 2005-06-28 | |||||||||
PCT Conventions:
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