SU754152A1 - Pneumatic drive for valve with lever intensifier - Google Patents

Description

(54) Pneumatic actuator for valves with lever

AMPLIFIER

one

The invention relates to a valve industry and is intended for use mainly in pneumatic hydraulic systems for controlling the opening of locking devices.

Known pneumatic actuators for valves with lever amplifier 1.

Also known is a pneumatic actuator for valves with a lever amplifier, the lever of which is inserted into the transverse hole of the valve stem, the short lever arm being kinematically connected with the support, and the long lever with the piston of the pneumatic cylinder 2.

A disadvantage of the known pneumatic actuator is that it does not provide optimum energy consumption when the control pressure is changed.

In order to eliminate this drawback, in the proposed pneumatic actuator, the lever is made telescopic, and in the piston radial drilling is performed, in which an additional piston pivotally connected to the long end of the lever is movably mounted, and the over piston cavity of the radial drilling is connected to the working cavity of the pneumatic cylinder and the control pressure source .

FIG. 1 shows a general view of the proposed pneumatic actuator (in section); in fig. 2 is a section A-A of FIG. one; in fig. 3 - the same, with the lower position of the pneumatic piston.

Claims (2)

J A piston 2 is installed in the cylinder 1 of the pneumatic actuator, in the inner cavity of which a lever amplifier is placed, consisting of a fixed support 3 and a telescopic lever, whose short arm is made in the form of a tubular element 4, and the long arm is in the form of a telescopically mounted rod 5 in it. Hinge 6 of the tubular element is connected to the fixed support, and the tubular element 4 is mounted for longitudinal movement in the hinge 7, which is connected to the valve stem 8, which cooperates with the compression spring 9. The rod 5 by the hinge 10 is connected with an additional piston 11 mounted in radial drilling 12 made in the piston 2 of the actuator. An additional piston 11 is fitted with a spring-loaded split ring 13 with an outer diameter slightly smaller than the drilling diameter 12, the cut of which with its chamfers 14 contacts the protrusion 15 formed on the rod 5. The spring 16 installed in the tubular element keeps the rod 5 and the additional piston 11 in the extreme right position. The over-piston cavity of the radial drilling 12 by the channel 17 is connected to the connecting nozzle 18 for supplying the control gas and the channel 19-to the chamber 20 formed above the piston 2 in the working cavity of the cylinder 1. The pneumatic actuator works as follows. When supplied to the control pressure fitting 18, the gas through the channels 17 and 19 enters the drilling piston 12 and the chamber 20, respectively. The piston 11 and the piston rod 5, compressing the spring 16, move to the left, thereby changing the ratio of the arms of the booster arm. After stopping the additional piston 11 and rod 5 and setting pressure in chamber 20, piston 2 begins to move, and from the initial moment of movement the control gas begins to flow into the cavity above piston 2, channel 19 min, thus maintaining the required drive speed. In addition, with the beginning of movement of the axle 2, the additional piston 11 is rotated relative to the hinge 10, as a result of which the protrusion 15 on the rod 5, interacting with the chamfers 14, enters the section of the spring ring 13, the ends of which are moved apart, and the ring 13 enters with its outer diameter close contact with drilling 12 (see Fig. 3). Thus, the additional piston 11 is fixed relative to drilling 12. The need for fixation follows from the considerations of ensuring the constancy of the shoulder ratio during the lever rotation, since otherwise this ratio will be variable due to the movement of the piston 11 with the hinge 10. an arc of a circle whose center lies in the center of the hinge 6. The piston 2 acts on the additional piston 11, turn the power amplifier lever, which, interacting with the hinge 7, compressing the spring 9 and moving the current 8 valve. In this case, depending on the magnitude of the control pressure, different movements of the piston 2 correspond to the same stroke of the rod 8, which ensures optimum energy consumption during operation of the drive. When the control gas is released from the cylinder 1, the swab 8 and the piston 2 return to their original position, the additional pressure 11 is uncoupled from the drilling 12, as a result of which the spring 5 and the piston 11 also return to their original position. The invention has a pneumatic actuator for valves with a lever amplifier, the lever of which is inserted into the transverse hole of the valve stem, the short lever arm being kinematically connected with the support, and the long one with the piston of the pneumatic cylinder, in order to ensure optimum energy consumption over a wide pressure range gas, the lever is made telescopic, and radial drilling is performed in the gun, in which an additional piston is pivotally mounted, hinged to the long end of the lever, moreover The piston cavity of the radial drilling is connected by a channel with the working cavity of the pneumatic cylinder and the source of control pressure. Sources of information taken into account in the examination 1. German patent number 836420, cl. 47 g 45/04, 1952. 2. USSR author's certificate number 493583, cl. F 16 K 31/00, 1974. 20 17 fuz.i A- A faz.2 A - A Fig.Z