SU531032A1 - Membrane Dispenser - Google Patents

Description

one

The invention relates to the field of instrumentation.

Dispensers are known that contain a constant-volume chamber divided by a membrane into two cavities, a multi-way valve with an actuator connecting alternately to one of the cavities alternately with the inlet line or the outlet line of the product being metered, and the other cavity with two constant-pressure sources of different size, a valve with an actuator installed on the inlet line of the product to be dosed, and a control unit with a pulse counter 2.

Also known is a membrane metering device, which contains a constant-volume chamber divided by a membrane into two cavities, a multi-running valve with a drive connecting one of the cavities alternately with the input or output lines of the product being metered, and the other with two sources of constant pressure of different size, a valve with an actuator mounted on the product inlet line, and a control unit with a pulse counter ij. However, low precision is observed: metering devices with flow fluctuations and

the pressure of the dosed product in the input line due to the lack of communication between the parameters of the dosed product (flow, pressure) and the switching stroke of the dispenser.

The purpose of the invention is to increase the metering accuracy. This is achieved by the fact that in both cavities of a constant-volume chamber there are movable partitions installed in conical guiding bodies and kinematically connected through tappets with contacts and through springs with task screws, one of the contacts being connected to the direct input of a multi-way actuator. tap, and the other contact - to the inverse input of the actuator, and the output of the pulse counter is connected to the actuator valve.

The drawing shows the proposed dispenser.

Claims (2)

The dispenser comprises a housing 1 with a membrane 2 dividing the internal volume of the housing into a working cavity 3 and a controlling cavity 4. In the cavities 3 and 4 there are movable non-hermetic partitions, which for better centering are installed in conical guides. The partitions 5 limit the travel of the membrane 2. On the partitions 5, springs 6 are installed with screws for 7 and pushers 8 connected to contact 1, Conteme 9, mounted on the body of step 9, mounted in cavity 4, are connected to the direct input of the drive 10 of multi-pass valve 11, and the contact 9, installed B cavity 3, with inverse input 12, the output of which is connected with the actuator 13 of the valve 14. The working cavity 3 through the valve channel 11 and through the valve 14 is connected to the input line of the product to be dosed, and through the channel Tj (, |) (the crane 11 - with a line of an exit of the dosed product. Managing cavity 4 through the channel P of the crane 11 is connected to a constant source and through the channel p of this reference pressure, the crane - to a source of constant command pressure. The dispenser works as follows. In the initial position, the channels Pr of the crane 11 are open, and the channels P are closed, the membrane 2 is in the lower position. The valve 14 is closed. At the start command, the pulse counter is reset to the zero position, and in the actuator 13 a signal is formed that opens the valve 14. The dosing product enters the cavity 3, the membrane 2 moves up, and the pressure in the cavities 3 and 4 remains equal to TQ. At the moment of complete adherence of the membrane 2 to the upper wall of the volume, the pressure in cavity 3 increases, the partition 5 of cavity 4 moves and through the pusher 8 closes contact 9. The signal from contact 9 enters the actuator 10, where the valve switching command 11 is formed. and RVI., are closed, and the channels P and. are opened. Gas flows into cavity 4, and the dosed product is displaced from cavity 3. At the moment of membrane abutment against the lower wall of cavity 3, the partition wall 5 of cavity 3 moves and closes contact 9, from which a signal goes to actuator 10 of crane 11 and a pulse counter. In this case, the valve 11 returns to its initial state, and a signal appears at the first output of the pulse counter. The dosing product re-enters the cavity 3, filling and emptying the container 3 similarly takes place until the i-th output of the pulse counter does not produce a signal that goes to the actuator 13. The actuator 13 switches the valve 14 to its original (closed) state 1 . The amount of product withdrawn can be adjusted by varying the spring backs of the spring 6 and the number of cycles v in the pulse counter. The invention The diaphragm metering device containing a constant volume chamber divided by a membrane into two cavities, a multi-way valve with an actuator that connects one of the cavities alternately with the input line or with the output line of the product being metered, and the other cavity with two sources of constant pressure of different size , a valve with an actuator mounted on the inlet line of the product to be dosed, and a control unit with a pulse counter, characterized in that, in order to improve the metering accuracy, in both cavities of the constant chamber These are movable partitions installed in conical guiding bodies and kinematically connected through pushers to contacts and springs to set screws, one of the contacts being connected to the direct input of the multi-way crane drive, the other contact to the inverse input of this drive and to pulse counter, and the output of the pulse counter is connected to the valve drive. Sources of information taken into account in the examination: 1.Gurevich A.L., Sokolov M.V. Pulsed automatic dosing systems for aggressive liquids. M., 1973, Energii, p. 67, fig. 42, p. 77, fig. 48. 2. USSR author's certificate No. 262408, cl. G 01 F 11 / O8, 197O, 13 72