EP0548432A1 - Automatic lifting device for domestic waste water - Google Patents

Abstract

The device can be used in the event that the main drain is at a higher level than the installation of bathroom or kitchen sanitary fittings. Figure 2 represents the device applied to a shower tray R. The device 1 includes in its base a pipe 2 to deliver the water to be drained, pointing upwards with a sharply decreasing cross-section up to an elbow 3 forming a high point, following which a sharp slope 4 follows, of greater cross-section and terminating in the body of a suction pump 5, a miniature float 6 being located upstream of the said elbow 3 in the narrowest section to control an electric switch causing the suction pump to start when the required level for emptying is reached, the said decreasing cross-section creating a venturi effect which, combined with the suction from the pump 5 when operating, ensures complete emptying, even of the very weak flow from a hand shower hardly open, for example, after which the said miniature float returns to a rest position causing the suction pump to stop until a new cycle. <IMAGE>

Description

The present invention relates to an automatic lifting device for 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.

• l'obligation de disposer le récipient précité en contre-bas du réceptacle à vider. Cela est possible concernant les lavabos et éviers,maisimpossible 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.

From the prior art, devices are known which consist of a container forming a relay into which the water ends, and when the level reaches the sufficient height, a float switch controls the starting of a submerged pump. 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 impossible 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 reaching a level. exaggerated level before the initiation 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 wastewater arriving in the relay container causing jerks in the flow (start-stop-start-stop .. .) and so on very unpleasant and dangerous for the electric motor.

The device which will be described on the contrary makes it possible to obtain a 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 at the lowest, that is to say a shower tray, to obtain the required lower part.

For the description, reference should be made to the attached 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 duct, 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 duct is strongly decreasing up 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 placed 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.

Claims (1)

Automatic wastewater lifting device (1), characterized in that it comprises at its base a conduit (2) for supplying the water to be discharged and directed upwards with a clearly decreasing section up to an elbow ( 3) forming a summit at the end of which follows a steep slope (4) of larger section leading to the body of a suction pump (5), a miniature float (6) being arranged immediately upstream of said bend (3) in the most narrowed section to control an electrical contact determining the actuation of said suction pump when the level required for emptying is reached, said decreasing section determining a Venturi effect which, combined with the aspiration of the pump in operation, ensures an absolutely complete emptying, even for the very low flow rate of a barely open shower for example, after which the said miniature float returns to the rest position controlling the stopping of the said pump eg suction until a new cycle.

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