Dentistry – Apparatus – Having suction orifice
Patent
1993-10-08
1996-01-16
Scherbel, David
Dentistry
Apparatus
Having suction orifice
494 35, 494 42, A61C 1706
Patent
active
054842824
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a separator for separating a mixture of solid and liquid, in particular waste water originating from dental practice, with an inlet for the mixture that is to be separated, with an outlet for the liquid that has been separated off, with a full-casing centrifuge which has an inlet opening arranged on the top, a transfer opening that is associated with the outlet for the liquid, and a drain for the solids, with a removable settling tank that is arranged beneath the outlet for the solids and used for the solids that run off after each centrifuging phase as a result of gravity, with a residual fluid fraction, with a pump that has a suction pipe that extends downwards into the settling tank to a point above a maximum preset sedimentation level (into the settling tank), and with a line that connects the pressure side of the pump with the inlet opening of the centrifuge.
2. Description of the Related Art
A separator of this type is described, for example, in FIG. 3 of WO-A-89/04152. In this separator, the inlet for the mixture that is to be separated, which originates, for example, from a dental suction system or from a rinse basin, is located in the separator on the top of the centrifuge and opens out into a mixture inlet chamber from which it moves into the centrifuge. The solids that flow out together with the residual liquid collect in the settling tank, from which the remaining liquid is moved upwards and into the mixture inlet by means of the pump. When a preset level of sediment is reached, the settling tank is removed and emptied and replaced by an empty tank.
It has been shown that a primary screen is useful or even necessary in the feed line to the mixture inlet in order to prevent particles that are too large from entering the centrifuge. Such particles come mainly from the rinsing basin, when the mouth is rinsed. Larger particles of this kind, such as bone or tooth fragments, pieces of amalgam, or even cellular material, can unbalance the centrifuge if they are not removed, or can impair the degree of purity of the liquid.
For this reason, it is the task of the present invention to so configure a separator of the type described in the introduction hereto that only particles of solid material that are of a size that can be processed without any difficulty are allowed into the centrifuge.
SUMMARY OF THE INVENTION
According to the present invention, this has been achieved in that the inlet for the mixture that is to be separated is provided on the top of the settling tank.
In this way, the mixture first moves into the settling tank, within which mainly the larger particles sink to the bottom so that the pump removes only the remaining liquid and those small and very small particles of solid that could not be separated off because the dwell time is too short or which, because of a momentary and very large quantity of water, have once again been stirred up, and then passes it to the centrifuge.
Thus, the pump not only returns the residual liquid from the centrifuge to the centrifuge; it also returns all of the liquid that is recovered. The arrangement of a sedimentation tank ahead of the centrifuge is known from SE-B-427 988, although the sedimentation tank, which is only indicated therein, is provided with an overflow that opens out into the centrifuge and with an inlet that is close to the bottom, so that essentially this is only a primary screen. The solids are collected in a second tank that is located beneath the centrifuge.
In general, separators of this kind are built in apparatuses used in dental chairs or into other items of equipment used in a dental practice and which, for this reason require a mounting, when there must be sufficient free space to remove the settling tank from beneath the apparatus. One embodiment according to the present invention is such that the separator has an installation case with transit-type openings, on which the centrifuge housing is arranged and on which the settling tank is he
REFERENCES:
patent: 4564374 (1986-01-01), Hofmann
patent: 4753632 (1988-06-01), Hofmann et al.
patent: 5018971 (1991-05-01), Trawoger et al.
Pregenzer Bruno
Trawoger Werner
Cooley Charles E.
Scherbel David
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