SU1016681A1 - Mebrane-type metering pump - Google Patents

Abstract

MEMBRANE LIQUID DISPENSER, containing: a housing with dispensing diaphragms {gamble and membrane) in each of them, with the chambers connected by channels with valve valves mounted on one or all of the two seals and separately hell and ys t; i, that in order to ensure the possibility of changing the ratio of the consumption of dosing fluids, the sylphor and brae 4 brane are formed in one of the dosing units of the dividing kayer, with &rs;amp; 1C (and through the pipe is connected to the bellows, and sylphs and fill-buffer oedkostyu. O5 00 Aude

Description

 The invention relates to dosing, in particular, to membrane, pneumatic, hermetic dispensers, intended for simultaneous volumetric dosing of two liquids, and can be used in chemical, petrochemical, food, and other areas of the national economy. simultaneous supply of two components at a given cost ratio. A dispenser is known that is equipped with a method for regulating the volume of the volume chamber while maintaining the ratio of the flow rates of the liquids and the pulse generator associated with two or more executive devices operating at the same frequency. The disadvantage of this device is that The cost ratio requires several pulse generators tuned to different frequencies and several execution devices. Closest to the technical essence of the invention is a multichannel metering pump for simultaneously metering two liquids. The disadvantage of the known device is due to the inability to change the ratio of liquid flow due to the absence of a node to change the volume of one of the measuring chambers. The purpose of the invention is to provide the possibility of changing the ratio of the flow rate of metered liquids. The goal is achieved by the fact that a membrane metering device containing a housing with metering chambers and a separation membrane in each of them, the chambers are connected by channels to the valves installed on the x-suction line and inlet separately, in one of the metering chambers The sylphs and the second membrane, which forms with the first membrane, are introduced. A separation chamber, which is connected to the bellows through the nozzle, wherein the separation chamber and the bellows are filled with a buffer fluid. FIG. 1 shows the design of the dispenser; in fig. 2 - cycle of operation of the instrument for controlling the dosing unit. I The dosing unit consists of a suction unit 1 and a delivery unit 2 diaphragm controlled shut-off valves with paired diaphragms 3 and 4, respectively. In the dispenser housing there are four lattice disks - internal 5 and external 6, forming measuring chambers 7 and 8. The internal part of the lattice disks is made in the form of a spherical segment. Between the lattice disks, the folded bases of the segments and forming the right measuring chamber 7, there is a separation membrane 9, and between the lattice disks forming the left measuring chamber 8, there are two membranes 10 and 11, the internal cavity between which is filled with buffer (separation) liquid 12, neutral to the dosed component. Through nozzle 13, the buffer fluid is connected to a remote volume variation unit of the metering chamber, which consists of a housing 14, inside which there is a bellows 15 and a spring 16. A micrometer screw 17 is provided for moving the bottom of the bellows, which is also a stop limiting the stroke of the bellows 15 Chambers 18, formed by outer grating disks 6 and metering caps 19, serve to supply pneumatic control signals to the diaphragm actuators. The dispenser works as follows. ... When filling the volume of the measuring chambers 7 and 8 with metering liquids G gx and G 2 e, x, a command signal is received (pressure closing of the discharge valve 2. Then, with a time delay fj, there is a command signal (vacuum P) to open the suction valve 1, after with a delay Tj, a command signal (vacuum P) in chambers 18 ... comes in. After filling the volumes of measuring chambers 7 and 8 with dispensing liquids, a command signal is sent to extrude single doses from measuring chambers. At the same time, a signal comes first (pressure P) to close suction The first valve 1. With a delay Tg, a command signal (vacuum Pj) is sent to the injection valve 2, after which a command pulse (pressure RH) is applied to the chamber 18. Membranes 9 and 10 are displaced in the direction of the valve block and the metered - Bones C,.,. ". and G,"., "through the injection valve 2, the VALVE valve 2 is squeezed into the corresponding connections. {The change in the volume of the measuring chamber occurs as follows. When set to the maximum volume of the measuring chamber, the micrometer screw is unscrewed the corresponding mark, the volume of the bellows is zrastaet and buffer liquid while under a slight excess pressure, fills bellows volume osvobodivshiys. The pressure in the system decreases and the resilient membranes 10 and 11 bend inward, increasing the volume

measuring chamber, and therefore / single dose .;

To reduce the volume of the metering chamber, the NMKpoMeTpH4ecKMfi screw is screwed to the appropriate depth, while the sylphs are compressed, the pressure of the buffer fluid increases, and the membranes 10 and 11 bend in opposite directions, reducing the volume of the metering chamber, and consequently, the unit dose.

The command ignals P, Pj and P ,, supplied respectively to the suction and injection cells; the apans and the membrane drives in a specific sequence are formed according to a predetermined algorithm with a device with pneumatic vacuum control in the form of discrete pneumatic pulses ..;

Based on the reliability of valves when filling and displacing the volume of a single dose, the duration of time delays for each of the channels is chosen from the condition

one

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Claims (1)

A MEMBRANE LIQUID DISPENSER containing: a housing with dosing chambers and a separation membrane in each of them, the chambers being connected by channels with valves installed on the suction and discharge lines167-170 with the fact that, in order to provide the possibility of changing the ratio of the flow rate of the dosed liquids , a bellows and a second membrane are additionally introduced into one of the metering chambers, forming a separation chamber with the first membrane, which is connected through a pipe to the bellows, the separation chamber and the bellows being filled with buffer Liquids CX) cx ”00