| 摘要 |
FIELD: one-use metering system. ^ SUBSTANCE: group of inventions refers to a one-use metering system. The one-use metering system includes a compressible tank for a liquid and a leakproof connected pump that can be tightened with the compressible tank for feeding of a liquid from the tank when it is being compressed. The pump includes a body frame that forms a chamber and a metering port. The pressure in the chamber can be changed in order to exhaust the liquid from the tank to the chamber and further from the chamber to the metering port and a regulator that is rigidly installed in the chamber in order to control the liquid flow between the tank and the chamber and between the chamber and the metering port. The pump can take a closed position when some amount of liquid is fed from the tank to the chamber under the influence of negative pressure that has been developed in the chamber and a metering position when some amount of liquid is fed from the chamber to the metering port. The invention is characterized by the fact that the pump is made of plastics and the pump contains a cancel device that automatically returns the pump from the mentioned metering position to the mentioned closed position. As a result the cancel device uses elasticity of the mentioned plastics in order to wear down the negative pressure that was developed in the compressible tank in the course of its depletion, and the tank is a semirigid tank, preferably the tank that contains one rigid lengthwise pump and one compressible lengthwise half, so that in the course of depletion the compressible lengthwise half will bear against the rigid lengthwise half. ^ EFFECT: improvement of usability. ^ 17 cl, 18 dwg |
