DOSING PUMP Drawing Figure
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ilicates, hydrates of soda or the like this leads to a crystallizing-out within the pump cylinder and thus to a destruction of the dosing pump. In using other dosing agents such an evacuation leads to a polymerisation and thus also to a destruction of the piston-cylinder-means. It is the object of the invention to create a dosing pump of the kind described at the outset where the above discussed drawbacks are avoided. In particular the expansion within the pump cylinder during the emersion of the piston shall be avoided. This object is achieved with a dosing pump according to the generic part by a connection of the pump cylinder with the suction conduit. Preferably the pump cylinder is connected with the suction conduit by means of a conduit comprising a sump. It is in particular the advantage gained by the invention that by avoiding the evacuation the above-mentioned drawbacks are avoided and thus the piston-cylinder-means will have a substantially longer lifetime and hence the dosing pump in general will be less susceptible to maintenance. An embodiment of the invention is shown in the drawing and in the following described in greater detail. The FIGURE shows a schematic and partly sectional representation of a dosing pump connected with a water supply and having a container for dosing agent. The dosing pump 1 comprises a pump cylinder 2 having an inlet positioned above as seen in vertical direction and an outlet 3 positioned close to its lower end. Above the pump cylinder 2 there is provided a dosing piston 4 being reciprocated relative to the pump cylinder by means of a schematically represented piston drive means 5 and thus is inserted into the cylinder and withdrawn from the cylinder, resp. The piston drive means 5 is connected with a pulse generator 7 by means of a control line 6, the pulse generator providing control pulses to the piston drive means as a function of the fluid amount flowing through a conduit 8. At its upper side the pump cylinder 2 is connected with a predelivery chamber 9 constituted by a housing 10. The walls of the housing 10 may be formed as diaphragm clamps 12, 13 laterally gripping a diaphragm 11. The lower part of the housing 10 is hermetically connected with the wall of the pump cylinder. In a distance from the wall of the pump cylinder there is provided an inlet 40 connected with a tube-shaped suction conduit 41, which is connectable with a container 16 for dosing agent. The suction conduit comprise