SU927131A3 - Multicomponent metering pump - Google Patents

Abstract

The combined metering/injection pump is intended for controlled admixture of a metered e.g. chemical to a main liquid and comprises a main pump (1) with main piston (5) reciprocating in a main cylinder (6) with inlet (7) and outlet (21), a valve (11) controlling the main pressure and a metering piston (13) reciprocating in a metering cylinder (17) with inlet (27) and outlet (22) connected with the main outlet (21). The main piston hydraulically operates the metering piston, the hydraulic fluid being the main liquid, and the metering piston separates the main from the metering cylinder. This separation may have a limited clearance. The metering piston may be co-axially connected with a cylindrical slide (12) which acts as the piston guide.

Description

one

The invention relates to pump engineering, relates to multi-component metering pumps, and can be used in various industries for the dosing of several fluids simultaneously.

A multi-component metering pump is known, comprising a piston pusher mounted in a housing and at least two pumping chambers separated by a piston separator, each of which is equipped with suction and discharge valves, and one located between the piston displacer and. til.15 separator

The disadvantage of the pump is the lack of reliability and accuracy of dosing due to the fact that the ratio of doses during the course of the separator does not significantly depend on the counterpressure of the 20 research institutes in each of the injection paths.

The purpose of the invention is to increase the reliability and dosing accuracy .25

To achieve the goal, the pump chamber, located between the displacer and the separator, is connected to the discharge valve provided with a shut-off valve connected to the piston separator. The locking slide valve is mounted coaxially with the piston separator and placed in a guide hole made in the housing.

In addition, the piston separator in the area of connection with the gate valve is provided with a collar.

The drawing shows the proposed pump.

A piston displacer 2 is installed in the pump casing 1 and at least two pumping chambers separated by a piston separator 3 and 5 are made, each of which is equipped with suction and discharge valves, respectively, 6, 7 and В, 9- One of the pumping chambers and it is chamber A that is located between the piston displacer 2 and divider 3- This chamber C is in communication with the discharge valve

7 by a channel 10 provided with a shut-off spool 11 connected to the piston separator 3. The shut-off spool 11 is mounted coaxially with the piston separator 3 and placed in a guide hole 12 made in the housing 1; A piston separator 3 in the region of connection with the gate valve is provided with a collar 13 against which the spring H rests. In the pump chamber 5 an abutment 15 for the separator 3 is formed. The spool 11 is installed in the guide hole 12 with a certain gap. At the entrance to the pumping chamber 5 is installed valve 16.

The device works as follows.

Piston displacer 2 reciprocates. When moving in the direction of the separator 3, the displacer 2 transmits the separator 3 with the spool 11 through the working fluid pumped by chamber k and inside it. Separator 3 moves to the left, compressing the spring 14 and displacing the reagent filling pump chamber 5 through the discharge valve 9k to the consumer. The movement of the separator 3 continues until it opens the channel 10 and the valve 11 opens channel 10. Thereafter} the dose of the working fluid is displaced from the chamber C by the propellant 2 proportional to the rest of the propellant 2.

During the reverse movement of the displacer 2, the spring Ut moves back and the separator 3. The reagent enters the expanding chamber 5 through the suction valve 8, the spool 11 cuts off the chamber k from the channel 10, At the end of the stroke, the separator 3 sits down the collar 13 on the housing 1 and then in the chamber upon further movement of the displacer 2, a vacuum occurs. The bladder is sucked through valve 6 of a new portion of the working fluid.

Thereafter, the displacer 2 starts moving again in the direction of the separator 3 and the cycle repeats,

After completion of work, the valve 16 is closed and the separator 3 hangs near the stop 15 due to the negative pressure in

chamber 5 arising from the failure of the reagent to enter it. In the case of a returnable overflow of the displacer 2, the working fluid through the gap between the spool 11 and the orifice 12 enters from the chamber k into the chamber 5 and flushes the latter from the reagent, thereby protecting the pump from destruction from exposure to the active medium.

When a new cycle of operation of the pump valve 16 is opened.

Due to the fact that the chamber 4 communicates with the discharge valve 7 through the shut-off valve 11, strictly cutting off the dose of the working fluid and the reagent, the reliability of the pump and the metering accuracy are improved.

Claims (1)

1. A multi-component metering pump comprising a piston propellant installed in the housing and at least two pumping chambers separated by a piston separator, each of which is equipped with suction and discharge valves, and one between the piston propellant and the separator, characterized in that increasing the reliability of operation and metering accuracy, the pump chamber located between the displacer and the separator is connected to the discharge valve provided with a shut-off valve connected with piston separator 2, a pump pop, 1, characterized in that the shut-off valve is mounted coaxially with the piston separator and placed in a guide hole made in the housing, 3 Pump on PP. 1 and 2, characterized in that the piston separator in the area of connection with the gate valve is provided with a collar. Sources of information taken into account in the examination 1, Britvin L.N. New directions in the development of dosing pump ai regattas, TSNITIHIMNEFTEMLSH,. c, 52, rice, 16.