SU1561000A1 - Pressure hydraulic relay - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to increase sensitivity and reliability. The relay contains a plunger 2 with a shank, on which a pusher 4 is pressed with a spring 11 at one end. with axial clearance. When the pressure applied to the end of the plunger 2 changes, the plunger with the pusher moves and the microswitch operates. 1 il.

Description

The invention relates to a measurement technique, in particular to a pressure switch, intended to supply electrical commands when pressure is increased or decreased relative to the pressure to which the switch is set,

The purpose of the invention is to increase the sensitivity and reliability.

The drawing shows a hydraulic pressure switch.

The relay consists of a housing 1, in the central bore of which a plunger 2 is installed, having a sealing ring 3 in the groove and fixed on the shank of the plunger perpendicular to its axis, a pusher 4 with a sleeve

5, which is supported at one end on the internal bore of the case, and connected to the other by a microswitch

6.In the case there are two channels

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for the supply of 7 working fluid and removal of 8 leaks of the working fluid through the clearance of the plunger. The face hole of the housing from the plunger side is closed with a stopper 9. At the other end of the housing in its outer bore there is a cylindrical housing 10 with a spring 11, which is installed in the sleeve 5, connected to the seat 12 and the adjusting screw 13 and rigidly connected through the bracket 14 to the housing. A microswitch is mounted on the bracket. The inner diameter of the flange of the cylindrical casing is smaller than the diameter of the inner bore and the end of the flange, placed with an axial clearance relative to the pusher.

The hydraulic pressure switch operates as follows.

When supplying the working fluid channel 7, the pressure rises to a value exceeding the compressive force of the spring 11, the plunger 2 with the pusher 4 and the sleeve 5 moves up to the stop at the end of the flange of the cylindrical casing 10, while the pusher releases the pressed button of the microswitch 6 and it is activated

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When the pressure of the working fluid in channel 7 drops to a value that is better than the spring force, the plunger with the pusher goes down all the way to the bottom of the inner bore of the housing, while the pusher again presses the microswitch button and it is triggered. The stopper 9 seals the bore in which the plunger is located. Plunger clearance leaks are channeled through channel 8 into the pre-critical system.

The amount of force of the spring is adjusted by an adjusting screw 13, which rests on the saddle 12 of the upper support element 9 of the spring. The working stroke of the plunger is provided by a gap between the end of the flange of the cylindrical casing and the pusher, t, e „equal to the difference between the depth of the internal bore and the thickness of the pusher.

The magnitude of the pressure difference of the working fluid at the moment the microswitch is triggered when the plunger moves from bottom to top and from top to bottom determines the insensitivity of the relay and is directly proportional to twice the amount of friction force. This frictional force is minimized, since with a slight displacement of the plunger, the sealing ring 3 remains almost stationary, and due to its elasticity it is only deformed without creating friction on the mating surfaces.

The advantages of the proposed hydraulic relay in comparison with the known ones are that the sensitivity of the relay increases, the reliability of operation due to the elimination of the main foci of friction during the piston displacement and the direct influence of the microswitch.

Claims (1)

Claims of Invention A hydraulic pressure switch comprising a cylindrical body, at the end of which a bore is made with a receiving chamber in which 5 15610006 the plunger with the shank, at the end of the core-in the end of the body is made the second pusa and coaxially with it is installed the qi-boring, coaxially with the first, and the other lindric casing in the form of a glass, completely mounted on the tailings of which the spring is installed, ke and pressed to the bottom of the second bore , and also containing the Pusher in the spring, with a glass in the open the bar placed perpendicular to the p-end is provided with a flange connected but the axis of the shank of the plunger, one ko-with the end of the body, while the innermost of which is in contact with the micropian flange diameter smaller than the diameter switch, characterized by the Q of the second bore, made in the body so that, in order to increase the cross, and the flange is placed with an axial sensitivity and reliability, in nezzazor relatively slats.