Metering device
The invention relates to a metering device for metered dispensing of a fluid, in which a storage container is connected to a metering head, a spindle being guided in the metering head and having a through-channel for the fluid to be transported.
1. A metering device for metered dispensing of a fluid, comprising:
a) a storage container with an opening which is disposed on the side opposite a base,
b) a metering head which is connected, in the operating state, to the opening and has
i) an outlet valve,
ii) a pump housing which is connected to the inside of the opening and has an inlet valve which is disposed in the direction of the interior of the storage container,
the metering head having a spindle which has a through-channel which connects the outlet valve and the inlet valve, wherein there is provided, at the opening of the storage container, a locking connection which connects the pump housing to the storage container and to the metering head, and wherein, in the metering head, a spring or bellows with an integrated sealing function is/are disposed between the inside of the metering head and the locking connection and is/are in operating connection with the locking connection, wherein the inlet valve is a plastic material disk valve, wherein there is disposed, in the storage container, bellows which are connected to the pump housing to form a seal, wherein the bellows have a contact device at at least one fold which is in contact with the inside of the storage container, and wherein the outlet valve is formed by a cone with an outlet opening which cooperates with a ball and a spring.
2. The metering device according to claim 1 , wherein the storage container is a cylindrical container and the opening is disposed in a tapered region which is configured as a neck.
3. The metering device according to claim 1 , wherein the locking connection is connected via a first gasket to the opening of the storage container.
4. The metering device according to claim 1 , wherein a second gasket is provided between the locking connection and the spindle.
5. The metering device according to claim 1 , wherein the bellows have a drag piston.
6. The metering device according to claim 1 , wherein the bellows consists of plastic materials, selected from PA, PET, PTEE, PP, PE or PU.
7. A method of using the metering device according to claim 1 , comprising the step of actuating the metering head to meter fluid or semi-solid contents.
8. The metering device according to claim 1 , wherein the outlet valve is formed by an opening in the metering head which cooperates with a ball, with a spring, bellows or a valve piston, or is formed by a plastic material cone with spring.
9. The metering device according to claim 8 , wherein the spring is a metal spring, a metal spring coated with plastic material or a plastic material spring.
10. The metering device according to claim 1 , wherein the material of the metering head, of the pump housing and of the storage container is selected from the following plastic materials: PA, PET, PTEE, PP, PE or PU.
11. The metering device according to claim 10 , wherein the material of the metering head preferably comprises silver as additive in the region of the outlet opening.
12. The metering device according to claim 1 , wherein the spindle is guided in the metering head and pump housing and has a central boring which forms the through-channel.
13. The metering device according to claim 12 , wherein the through-channel is widened in the direction of the inlet valve.
14. The metering device according to claim 12 , wherein the through-channel is dimensioned in the direction of the outlet valve such that the outlet valve can engage.