PROPORTIONING PUMP (VERSIONS) Russian patent published in 2003 - IPC

FIELD: materials handling facilities. SUBSTANCE: proposed pump is designed for use in metering of liquid materials by bellows-type devices and it can operate at higher pressure systems. According to first design version, pump has housing with space accommodating bellows and liquid inlet and outlet devices for distribution of liquid. One end of bellows is hermetically coupled with housing, and the other is installed for reciprocating along its axle. Valve is installed on movable end of bellows to place bellows space in communication with housing space when bellows are compressed. Simultaneously inner volume of bellows is hydraulically communicated with inlet device, and housing space is communicated with outlet device, while bellows space is filled up with liquid to be metered out. According to second design version, pump is provided with valve arranged on movable end of bellows and installed to placed space of bellows in communication with space of housing at extension of bellows. Inner volume of bellows is hydraulically communicated with outlet device, and space of housing is communicated with inlet device, while space of bellows is filled with liquid to be metered out. With pump operating in higher pressure system, invention makes it possible to bring power of drive of bellows movable end to minimum. EFFECT: improved reliability in operation. 3 cl, 2 dwg