Dosing pump

Details Dosing pump Dosing pump

1983-11-09

1985-06-18

Freeh, William L.

Pumps

Expansible chamber type

Control by withdrawal or tilting of pump piston relative to...

417502, 417503, 417521, 222318, F04B 704, F04B 2304

Patent

active

045239037

DESCRIPTION:

BRIEF SUMMARY
The invention refers to a dosing pump comprising a pump cylinder connected at its inlet side with a predelivery chamber and at its outlet side with a dosing point and a dosing piston cooperating therewith as well as a diaphragm, whereby the predelivery chamber is positioned above the pump cylinder and is connectable with a container for dosing agent via a suction conduit comprising a suction valve and a return conduit comprising a pressure valve.
In a known dosing pump with dosing piston-cylinder-means and predelivery diaphragm the predelivery chamber is connected with a container for dosing agent via a suction conduit comprising a suction valve and a return conduit comprising a pressure valve. The predelivery is performed via the suction conduit and the suction valve to the predelivery chamber. The dosing piston takes the required amount of dosing agent from the predelivery chamber. The excess amount of dosing agent is transported back into the container for dosing agent via the pressure valve and the return conduit. In a known dosing pump the pump cylinder is connectable with a dosing point via a pressure valve. When the piston is withdrawn from the cylinder a vacuum is drawn which causes volatilization of the dosing agent. In using certain dosing agents such as silicates, 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 comprises a suction valve 42 preventing backflow from the predelivery chamber 9 into the container 16. The inlet 40 is disposed on a level, as seen from the fluid level formed in the predelivery chamber, vertically above the inlet side of the pump cylinder 2.
There is further provided a return conduit 43 being as well connect

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patent: 4336800 (1982-06-01), Giovanni
patent: 4375864 (1983-03-01), Savage

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