RU38366U1 - MEMBRANE HYDRAULIC DRIVE DOSING PUMP - Google Patents

Description

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 - IPC F 04 V 43/06

MEMBRANE HYDRAULIC DRIVE DOSING PUMP

The utility model relates to hydraulic diaphragm metering pumps with membranes made of polymeric materials, intended for volumetric pressure dosing of neutral, aggressive, toxic, explosive explosive and other fluids under a pressure of more than 35 MPa in technological processes of chemical, oil refining, heat power and other industries

industry.

The closest device of the same purpose to the declared

A useful model is a hydraulic diaphragm metering pump containing a drive mechanism, a housing with a diaphragm separator for the drive and pump chambers, a displacer made in the form of a sealed plunger, a reservoir for supplying drive fluid, a filter, a make-up valve, and an air separator; the make-up valve is installed in the lower part of the diaphragm pump housing and is connected to the drive chamber and the reservoir for supplying the drive fluid with channels, the air separator consists of a fitting screwed into the housing, in which a seat sealed with an elastic ring, a spacer sleeve and a ball are fixed, screwed into the fitting by a passage with a seat on the lower end and a tube screwed on top, inside which a needle is placed, resting on the ball with the lower end and protruding from the nozzle screwed onto the tube with the upper end (see elstvo for utility model number 31153, IPC F 04 B 43/06, publ. 20.07.2003).

The disadvantage of the prototype is that the membrane, pinched between the halves of the pump casing and sealing both the drive chamber from the pump and the pump cavity from the atmosphere, is affected by unilateral pressure of the working medium at the pinch point. Is not

allows to achieve high discharge pressures, in particular due to the cold flow characteristic of polymeric materials that are used for the manufacture of the membrane.

The objective and technical result of the utility model is to provide the possibility of operation of membrane pumps with polymer membranes at a discharge pressure of more than 35 MPa.

The specified technical result is achieved in that the hydraulic diaphragm metering pump comprises a drive mechanism, a housing with a membrane separator of the drive and pump chambers sandwiched between the halves of the housing, a displacer made in the form of a sealed plunger, a reservoir for the supply of drive fluid, a filter, a make-up valve, and a blocking valve , an air separator, while the pinch point of the membrane is separated from the atmosphere by a closed annular cavity hydraulically connected to the drive chamber and sealed from atm sphere elastic ring and the annular cavity and the resilient ring disposed in the pump housing and axially offset from the membrane.

The figure shows a general view of the hydraulic diaphragm metering pump.

The pump contains a housing 2 and a flange 9, between which a membrane 8 is clamped, dividing the internal cavity of the diaphragm pump into a drive chamber and a pump chamber, a displacer connected to the drive mechanism, made in the form of a sealed plunger 1, a reservoir for supplying a drive fluid 4, a filter placed in the reservoir 4. The pump is equipped with a make-up valve 14, a blocking valve 10 and an air separator 3. The drive chamber is connected through a blocking and make-up valve with a pipe 13 with a capacity of 4 and a channel in the housing 2 with an air duct installed in the tank by a separator, a make-up valve is installed in the lower part of the housing 2, a blocking valve is installed in

the Central part of the housing 2. In the pump housing with an axial displacement from the pinch point of the membrane, an annular cavity 6 is formed, formed by the mating surfaces of the housing 2 and the flange 9. From the extreme upper and lower lower zones of the cavity 6, channels 5 and 15, respectively, exit it with a drive chamber, while channel 15 passes the feed channel. The annular cavity, after the whole drive chamber is sealed from the atmosphere by an elastic ring 12, sandwiched between the housing 2 and the flange 9.

During the reciprocating movement of the plunger 1, the membrane 8 performs a similar movement, as a result of which the volumes of the drive and pump chambers are periodically changed, the pumped medium is sucked into the pump chamber through valve 11 and displaced through valve 7 into the discharge line.

Air generated at the suction stroke from the drive fluid or from the atmosphere through the seal of the displacer accumulates in the upper part of the drive chamber and is removed through the air separator 3 into the tank 4 along with a small amount of the drive fluid. The loss of drive fluid in the automatic air separator, as well as in the displacer seals, is compensated by recharge from tank 4 due to actuation on the suction stroke of valves 14 and 10.

Since the annular cavity 6 is connected by channels 5 and 15 to the drive chamber and is sealed from the atmosphere by a separate seal, the pressure both from the inside and outside of the pinch surface of the membrane is the same, which allows the polymer membrane to work at pressures above 35 MPa. Channels 5 and 15, emerging from the cavity 6 in the extreme upper and lower zones provide reliable removal of air from the cavity 6 during its primary operation. filling with drive fluid and in

Claims (1)

Hydraulic diaphragm metering pump comprising a drive mechanism, a housing with a diaphragm separator of the drive and pump chambers sandwiched between the halves of the housing, a displacer made in the form of a sealed plunger, a reservoir for supplying drive fluid, a filter, a make-up valve, a blocking valve, an air separator, characterized in that the pinch point of the membrane is separated from the atmosphere by a closed annular cavity hydraulically connected to the drive chamber by two channels emerging, respectively, from the extreme and at its lower zones of the annular cavity, the sealed from the atmosphere by an elastic ring, the annular cavity and the resilient ring disposed in the pump housing and axially offset from the membrane.