EP0548432B1 - Automatic lifting device for domestic waste water - Google Patents

Description

The present invention relates to an automatic device for lifting waste water for discharging into sewers.

Experience has shown that in many cases baths, sinks, bidets, showers and sinks cannot be installed in bathrooms and kitchens because the sewer is at a level higher than that of the points to be drained.

From the prior art DE-A-3516656 or FR-A-2151221, devices are known which consist of a receptacle forming a relay into which the water ends, and when the level reaches the sufficient height, a float switch controls the setting in running, and conversely stopping, a submersible pump.

• l'obligation de disposer le récipient précité en contre-bas du réceptacle à vider. Cela est possible concernant les lavabos et éviers,mais impossible pour tout ce qui est situé au ras du sol,tel que les baignoires,bidets et douches qu'il est alors nécessaire de surélever pour empêcher que le liquide se trouvant à l'intérieur atteigne un niveau exagéré avant le déclenchement de la vidange,laquelle du reste cesse avant d'être complète,suivant la longueur du bras du flotteur.
• le phénomène de "battement" bien connu,occasionné par les aspirations trop rapides de la pompe relativement au débit des eaux usées arrivant dans le récipient relais provoquant des saccades dans l'écoulement (mise en marche-arrêt-mise en marche-arrêt...) et ainsi de suite très désagréables et dangereux pour le moteur électrique.

This arrangement is affected by several drawbacks such as:

• the obligation to have the aforementioned container below the receptacle to be emptied. This is possible for sinks and sinks, but not possible for anything that is level with the floor, such as baths, bidets and showers, which must then be raised to prevent the liquid inside it from reaching an exaggerated level before the emptying of the emptying, which moreover ceases before being complete, depending on the length of the float arm.
• the well-known phenomenon of "flapping", caused by too rapid aspirations of the pump relative to the flow of waste water arriving in the relay container causing jerks in the flow (start-stop-start-stop-stop .. .) and so on very unpleasant and dangerous for the electric motor.

The device according to the invention, on the contrary, makes it possible to obtain permanent regular suction.
It is miniaturized in order to be able to be housed at a very low height and in any case not higher than the usual height of the bottom of the receptacle located lowest, that is to say a shower tray, to obtain the required lower part.

For the description, reference should be made to the accompanying drawing, by way of nonlimiting example, in which FIG. 1 represents the lifting device according to the invention in isolation, and FIG. 2 a view of the same device applied to a receptacle of shower.

In these Figures, in which the same elements are designated by identical references, the body 1 of the elevator includes the conduit 2 for supplying the water to be evacuated connected to the receptacle R to be drained (a shower tray in this example). This conduit, which penetrates at the base of the body 1, is directed upwards to a vertex 3 in the form of a pronounced elbow. The section of this part 2 of the conduit is strongly decreasing to the vertex 3 from which the part 4 of the duct is sloped with a larger section to lead to the body of a conventional suction pump 5 included in the body 1. Immediately upstream from the top 3 is disposed a miniature float 6 mounted on a very short lever arm 7. The reference P designates an air intake.

The operation of the device is as follows: the water fluid arrives from bottom to top according to the arrow and acts on the float 6 which then controls an electrical contact determining the activation of the suction pump 5. The significant narrowing of the duct 2 upstream of the apex 3 forms a constriction which produces a Venturi effect which, combined with the suction of the pump 5, causes an absolutely complete rapid evacuation by the duct 8, even for a very low flow rate. After which the float 6 returns to its rest position, thus controlling the stopping of the pump 5 by cutting the electrical circuit, and this, until a new operating cycle.

The aforementioned beat is avoided due to the fact that as a result of the suction due to the pump in the very small space of the device, the latter is reflected on the level of the liquid which begins to rise by the slope 2 ′ by compulsory sliding.

From the above description it follows that this easy-to-house device ensures rapid total drainage of the wastewater.

It is obvious that the appended drawing being schematic, all shapes and proportions can be given to the constituent elements without departing from the scope of the invention which is determined by the content of the claim.

Claims (1)

1. Automatic device (1) for lifting domestic waste water, intended to be connected up to an outlet and comprising a suction pump (5) automatically controlled as a function of the level of the liquid to be drained, characterized in that it comprises, at its base, a pipe (2) for inlet of the water to be removed, directed upwards, with a cross-section which decreases markedly as far as an elbow (3) forming a top, after which there follows a highly sloping pipe (4) of greater cross-section and ending in the body of the suction pump (5), a miniature float (6) being arranged immediately upstream of the said elbow (3) in the narrowest cross-section in order to actuate an electrical contact bringing about the actuation of the said suction pump (5) when the level required for draining is reached, the said decreasing cross-section bringing about a Venturi effect which, combined with the suction of the pump when operating, ensures absolutely complete draining, even for the very small delivery from a small shower unit, barely open for example, after which the said miniature float (6) returns to the rest position, actuating the stopping of the said suction pump until a new cycle.

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