Baths – closets – sinks – and spittoons – Flush closet – Bowl
Patent
1999-02-11
2000-10-10
Fetsuga, Robert M.
Baths, closets, sinks, and spittoons
Flush closet
Bowl
4434, E03D 1100
Patent
active
06128789&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and device for operating the water flushing and the discharge valve in a toilet or the like in a vacuum sewer system.
In a vacuum sewer system the vacuum is provided by means of one or more vacuum pumps which are either directly connected with the collecting pipe (drainage pipe) from the toilets, urinals or the like in the system, or connected with a vacuum tank to which the collection pipe is connected.
A disadvantage with the commonly known vacuum sewer systems is that strong noise is created when the toilets are discharged, i.e. when the discharge valve for the respective toilet or the like opens. Particularly, there is a peak noise immediately after the opening of the discharge valve starts, and an additional peak noise when the closing of the valve starts. These peak noise levels are due to the throttling of the outlet opening through the discharge valve.
Several methods and means have been tried to reduce the noise from toilets or the like in vacuum sewer systems. Inter alia it is commonly known to use air tight or noise absorbing toilet lids, as well as to apply false air in connection with the discharge valve. But such methods and means have reduced the noise quite marginally, i.e. 1-3 decibels.
Surprisingly, when testing the discharge function in vacuum toilets, the inventor found that the noise could be reduced significantly by reducing the opening and closing time for the discharge valve. According to the invention the inventor arrived at a method for controlling or operating the discharge valves in sewer systems which is characterised in that the discharge valves opens at a speed which gives an opening time which is lower than 0.75 second, and closes at a speed that gives an opening time of less than 0.75 second.
Further, the inventor arrived at an operating or control device that fulfills the above criteria as regards operating speed, and which is characterised in that it comprises three operating valves that are controlled by a cam device which is driven by a piston/cylinder device, whereby the first operating valve, being triggered by a start mechanism, is provided to connect the chamber in the cylinder device with the vacuum source in the collecting pipe via a corresponding supply channel, conduits and vacuum reservoir, the second valve is provided to connect the vacuum reservoir with the drive unit for the discharge valve via corresponding conduits, and the third operating valve is provided to connect the flushing ring for the toilet with a water supply via corresponding conduits.
The independent claims 2 and 4-8 define advantageous features of the invention.
The invention will now be further described by means of examples and with reference to the drawings in which,
FIG. 1 shows a diagram for the noise level versus the time for the opening and closing of a discharge valve in a toilet, where the method according to the invention and an improvement of the method is compared with a known solution, and
FIGS. 2-4 show three sequences of a toilet with a discharge valve, flushing device and operating device according to the invention,
FIGS. 5-7 show three sequences of the same devices as in FIGS. 2-4, but with an alternative release button and an additional operating valve for the discharge valve.
As mentioned above, peak noise levels occur when the discharge valve in a toilet of a vacuum sewer system is respectively opened and closed. These peak noise levels are created in the through flow opening of the valve when the valve body or valve closing member is on its way up or down and thereby makes a throttling of the through-flow opening of the valve. It is the fluid (air) passing through the narrow opening that makes the noice when it reaches a certain velocity. The water in the toilet bowl as well as the air being present in the system represents a mass which is subjeted to accelleration when the valve opens. In principle the valve therefore has to open at such speed that it will be fully open (no restriction in the throug flow of it) before the air rea
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patent: 5007117 (1991-04-01), Oldfelt et al.
patent: 5165457 (1992-11-01), Olin et al.
patent: 5317763 (1994-06-01), Frank et al.
patent: 5515554 (1996-05-01), Clear et al.
Fetsuga Robert M.
Safran David S.
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