SU1295040A1 - Pneumatic displacement pump - Google Patents

Description

The device relates to replacement pumps, using compressed gas energy as a drive, and can be used in the repair of ships in dock conditions.

The aim of the invention is to increase productivity by automatically controlling the air valve and ensuring pumping of contaminated water.

The drawing shows the pump.

The pneumatic replacement pump contains a working chamber 1 with suction 2 and discharge 3 valves, a vortex ejector 4 with a slot diffuser 5 and an air valve 6 fixed on the wall 7 of the diffuser 5, a variable volume actuator 8 with traces 9 is inserted into the pump - the pilot valve 10 and the auxiliary ejector 11, the active nozzle of which through the check valve 10 is connected with the lower part of the working chamber 1, and the passive nozzle - with the actuator 8 of variable volume, while the plugs 9 are connected with the air valve 6, and the diff the pattern 5 is equipped with a labyrinth seal 12 and a stop 13, and the pump further comprises a filter 14 placed in the lower part of the working chamber 1 and connected through a check valve 10 to the active nozzle of the auxiliary ejector 11,

The device works as follows 1m.

When compressed air is supplied to the inlet of the vortex ejector 4, a vacuum is generated in its axial zones and in the working chamber 1. An additional decrease in pressure contributes to the slit diffu. Zor 5, which converts the kinetic energy of the vortex into pressure energy. When the pressure in working chamber 1 is reduced, the suction valve 2 opens and chamber 1 is filled with liquid washing filter 14. Auxiliary vortex ejector 11 is disconnected at this moment because the pressure in working chamber 1 is below atmospheric and the check valve 10 is closed. When the working chamber 1 is completely filled, the liquid enters the slot diffuser 5 and under the action of centrifugal forces

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is limited in the annular gap bounded by labyrinth seal 12. As a result of the fluid acting on the movable wall 7, the gap of the slot diffuser 5 is u (it is differentiated by the movement of the movable wall 7 upward to close the air valve 6. In this case, the actuator 8 is expanded.

After the air valve 6 is closed, the gas supplied by the ejector is directed to the working chamber 1. The pressure in the chamber 1 rises, and the suction valve 2 closes, and the discharge valve 3 opens. Through the filter 14 and the open non-return valve 10, a small part of the liquid enters the auxiliary ejector 11 and is discharged into the tank with pumped liquid (not shown). Due to the considerable resistance of the flow path of the auxiliary ejector 11 when working on the liquid, the amount of rarefaction in actuator 8 is not sufficient to open air

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valve 6. When the working chamber 1 is emptied, the compressed air at a pressure equal to the discharge pressure through the filter 14 and the return valve 10 rushes into the auxiliary ejector 11. As a result of the decrease in pressure in the cavity of the actuating device 8, the latter is compressed 9, opens the air valve 6 up to the stop of the moving wall 7 into the limiter 13. At the same time, the remaining water of the mz annular drip of the labyrinth seal 12 is introduced into the atmosphere through the opening of the valve 6 and does not cause the latter to close. Lost actuator is maintained underpressure. The pressure equalization in the device 8 with the ambient pressure will occur only after the complete release of the valve 6, the removal of water from the labyrinth seal 12, the pressure in the working chamber 1 is reduced by the vortex ejector 4 and the check valve 10 is closed. the air valve 6 is maintained until the beginning of the suction cycle and ensures reliable opening of the valve 6,

Claims (3)

1. PNEUMATIC REPLACEMENT PUMP containing a working chamber with suction and discharge valves, a vortex ejector with a slot diffuser and an air valve fixed to the wall of the diffuser, characterized in that, in order to increase productivity by automatically controlling the air a valve, an actuator of variable volume with rods, a check valve and an auxiliary ejector, the active nozzle of which is connected to the lower part of the working chamber through a non-return valve, and a passive nozzle connected with the variable valve actuator, while the rods are connected to the air valve. 2. Pump pop. 1, characterized in that the diffuser is equipped with a labyrinth seal and limiter. 3. A pump according to Claim. ^ Characterized in that, in order to ensure pumping of polluted water, the pump additionally contains a filter placed in the lower part of the working chamber and connected through a non-return valve to the active nozzle of the auxiliary ejector. 51) „„ Ϊ 295040 > 1295040 2 The device relates to replacement pumps, using as a drive energy of compressed gas, and can be used in the repair of ships in dock conditions.