Dispensing – With discharge assistant – With movable nozzle interconnected therewith
Patent
1996-09-19
1997-12-02
Huson, Gregory L.
Dispensing
With discharge assistant
With movable nozzle interconnected therewith
2223212, 2223219, 141 65, B65D 8854
Patent
active
056926499
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a suction and force pump for a fluid in a sealed fluid container having a pressure cylinder protruding into the fluid container. A piston is sealingly guided in the pressure cylinder, and has an axial pump channel. A pressure chamber is formed in the pressure cylinder, which pressure chamber is bounded by the piston and by a valve effective with respect to the fluid container. The valve closes in the case of over-pressure, and opens in the case of under-pressure, and is connected with the axial pump channel.
Such a suction and force pump is known for example from German patent specification DE 27 09 796 C3. The liquid to be sprayed is found in a sealed fluid container into which the suction and force pump protrudes. A piston runs in a pressure cylinder which piston upwardly bounds a pressure chamber. This pressure chamber is connected with the fluid container by means of a valve. In the interior of the piston there is an axial pump channel for transportation of the fluid out of the pressure chamber to a discharge opening. The piston is held in an upper rest position by means of spring force. When the user presses the piston downwardly, e.g. by means of an actuating element that can be placed thereon, the pressure in the pressure chamber thus increases, the valve closes with regard to the fluid container, and the liquid in the pressure chamber escapes under pressure to the outside, by means of the axial pump channel. When the user releases the actuating element for the piston, the piston is thus urged upwardly by means of the spring force whereby an under-pressure comes about in the pressure chamber and the valve to the fluid container opens so that liquid can again flow into the pressure chamber.
Such suction and force pumps are used also for liquids which are to be stored in as sterile conditions as possible, for example for medical applications. Likewise, such pumps are used for spraying liquids for which contact with oxygen in the air leads to a reduction of the life of the liquid. For such applications, there is described in German patent application DE 41 39 555 C2 a suction and force pump having a fluid container which has an additional deformable internal bag sealed off against the atmosphere, so that the under-pressure caused in the fluid container by liquid flowing into the pressure chamber does not lead to a flow of air into the fluid container.
However, such suction and force pumps not having air compensation have the disadvantage that upon filling of the container residual air stays in the fluid container and that this cannot be removed. Thus, the liquid is constantly in contact with oxygen in the air which leads to a reduction of the storage time or the sterility of the liquid. A filling of the fluid container in a sterile atmosphere or under a protective gas is, however, very complex and expensive.
The invention thus has the object to provide a pressure-suction pump with which, after the filling procedure, the removal of residual air is possible in a simple way.
This object is achieved by the combination of features characterized in that the piston is sealed in the pressure cylinder only by a peripheral sealing lip. The pressure cylinder has a region in which the sealing lip has no sealing effect. The axial pump channel has an internal diameter of such size that a plunger can be passed therethrough, with which plunger the valve to the fluid container can be closed independently of pressure. A plunger is connected with the piston, which plunger, in the lowest position of the piston, closes the valve to the fluid container independently of pressure. The pressure cylinder has openings to the upper part of the fluid container for drawing off by suction any residual air in the fluid container.
In order to be able to draw off the residual air by suction, with a closed container, that is with a dosing pump set in place, there are provided in the pressure cylinder openings to the upper part of the fluid container. The piston is guided sealingly in the greater part of the pres
REFERENCES:
patent: 4532967 (1985-08-01), Graf
patent: 4964547 (1990-10-01), Lina
Huson Gregory L.
Ursatec Verpackung GmbH
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