RU1789818C - Electro-pneumatic valve - Google Patents

Abstract

FIELD OF THE INVENTION This invention relates to valves of pneumatic hydraulic systems, in particular to valves controlled by an electromagnet. The purpose of the invention is to increase the reliability of the electropneumatic valve by eliminating the loss of the working medium in the drainage upon opening. During the movement of the shutter 6 from the seat 4 to the drainage seat B, the drainage cavity is isolated from the outlet cavity by sealing the seat C of the sleeve 7 along the shutter b. When closing the electropneumatic valve, the shutter 6 moves away from the seat C of the sleeve 7, opening the passage into the drainage cavity. The sleeve 7 is thus held in the extreme right position due to the communication of the cavity formed by the steps of the sleeve 7 and the housing with the outlet. 2 ill.

Description

The invention relates to valves of pneumatic hydraulic systems, and more particularly, to valves controlled by an electromagnet, and can be applied to turn on the supply of a gaseous working medium to various devices, followed by drainage from them.

Electro-pneumatic valves (EPCs) are known for turning on the fluid. Such devices include a housing, a spring-loaded shutter, a control electromagnet with a control valve (see, for example, AC No. 653475, F 16 K31 / 02, AC No. 1112164, F 16 K 31/02).

The disadvantage of such EPAs is the impossibility of using them for supplying a working medium to various devices where subsequent drainage of them is necessary, for example, for controlling pneumatic valves. Of the known devices, EPA is closest to the one proposed in technical essence. comprising a housing with inlet and outlet nozzles and two saddles (main and drainage), a shutter installed between the saddles, an electromagnet with a control valve, a spring-loaded piston that abuts the shank against the shutter from the side of the drainage saddle and the cavity of which is communicated through the control valve with the inlet cavity (see the book Agranovsky M.M. Power pneumatic systems, M., 1965. S. 115-117, Fig.

70).

The main disadvantage of the described EPA is the low reliability due to the presence of losses of the working medium in the drainage when it is opened,. during the movement of the shutter from the main seat To the drain.

The aim of the invention is to increase the reliability of the EPA.

This goal is achieved by the fact that the EPA is equipped with a spring-loaded stepped sleeve enclosing the piston, at the end of which a lower seat is made with a seat in contact with the bolt with a passage

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the channel and in the same stage are made radial holes communicating the passage channel with the drainage cavity, the cavity formed by the steps of the sleeve vn by the housing communicating with the outlet cavity. The proposed EPA has the following distinctive (from the prototype) features:; J. ... (,

1 .Installation of a spring-loaded step sleeve gripping the piston, at the end of the lower stage of which a seat contacting with the bolt is made with a passage channel, and with radial holes made in the same stage, communicating the passage channel with the drainage cavity.

2. Communication cavity formed by the steps of the sleeve and the housing with the output cavity,

On Fig, 1 shows a longitudinal section of an EPA; in FIG. 2 is a section AA in FIG. 1.

EPA consists of. of the housing 1 with a seat B. and an electromagnet 2 with a control valve 3. In the housing 1 there is a saddle 4, a fitting 5 a shutter 6, a stepped sleeve 7 and a plug 8, a stepped sleeve 7 covers a piston 9 provided with a shank C, which is provided with a spring 10 V the shutter 6 from the seat side B of the housing 1. The piston 9 is made with a diameter equal to the diameter of the seat 4 at the seal of the shutter 6. At the end of the lower stage of the sleeve 7 there is a saddle D with a passage channel E in contact with the shutter 6. The sleeve 7 is loaded with a spring 11, At a smaller the steps of the sleeve 7 are made radial e holes F (see FIG. 2), communicating the passage channel E with the drainage cavity G. In the housing 1 there is a channel H communicating the cavity formed by the steps of the sleeve 7 and the housing 1, with the outlet cavity I. Inlet cavity K. through the channels L in the seat 4, M and N in the housing 1, P in the plug 8 is connected with the cavity R behind the piston 9. In the electromagnet 2, the core 12 and the stem 13 are installed. The control valve 3 is squeezed from the channel M by a spring 14.

The operation of the EPA is as follows.

In the initial position, the EPA is closed. The working medium under pressure is supplied to the inlet part of the cavity K, the Inlet cavity K is cut off from the outlet cavity by a valve 6, which is pressed to the seat 4 by a spring 10 through the piston 9, and by a spring 11, through a step sleeve 7, abutting the seat D against the valve 6. In this case the force from the pressure of the working medium in the inlet cavity K acting on the shutter 6 is balanced by the force from the pressure of the working medium in the cavity R acting on the piston 9, made with a diameter equal to the diameter of the seat 4 at the sealing point by the second 6. The working medium enters the cavity R from the cavity To Erez

channels L in the saddle 4, channels M and N in the housing. . 1 and channel P in plug 8.

When applying voltage to the electromagnet 2, the core 12 under the action of electromagnetic forces moves down and through the rod

13 moves control valve 3 downstream of channel M. of the channel R through the channels P, N, the cavity of the control valve 3, the holes in the electromagnet 2 are discharged into the environment. Gate

under the influence of the pressure of the working medium in the inlet cavity K moves away from the seat 4 and, overcoming the forces of the springs 10 and 11, moves to the right until it stops in the seat B. The working medium from the inlet cavity K passes into

the outlet cavity I. The drainage cavity G is thus blocked by the shutter 6. During the movement of the shutter 6, the drainage cavity G is closed by a step sleeve 7 contacting the seat D with the shutter 6. As the pressure in the outlet cavity I increases, the pressure of the working medium in the cavity J entering into it through channel N. When the voltage is removed from the electromagnet 2, the control valve 3 under the action of

the spring 14 moves upward and cuts off the channel N from the environment, while the channel M opens. The working medium from the inlet cavity K passes through the channels L, M, N, P into the cavity R. The gate is unloaded

from pressure and under the action of the spring 10 (through the piston 9) moves to the left and seals along the seat 4. in this case, the outlet cavity I through the passage channel E, the radial holes F (Fig. 2) communicate with the drainage cavity G, since the sleeve is stepped by Pressure in the cavity, J is held in the rightmost position. After the discharge of the working medium from the output cavity of the I step, the sleeve 7 under the action of

the spring 11 moves to the left until it stops at the shutter 6.

Thus, the proposed implementation improves the reliability of the EPA by reducing the loss of the working medium from the outlet cavity to the drain when opening the EPA.

Claims (1)

The claims An electro-pneumatic valve comprising a housing with an inlet, outlet and drainage cavities and two seats, between which a gate electromagnet with a control valve and a spring-loaded piston, which rests against the gate against the gate, are installed, characterized in that it it is equipped with a spring-loaded step sleeve enclosing the piston, at the end of the smaller stage of which a seat contacting the valve with the passage channel is made and radial holes are made in the same stage, communicating the passage channel with the drainage cavity, the cavity formed by the steps of the sleeve and the housing communicating with the outlet. (fiuzf FIG. 2