SU1468802A1 - Protection valve for pneumatic systems - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to mechanical engineering and concerns mainly the construction of protective valves of closed pneumatic systems. The aim of the invention is to increase reliability. In case 1, having two unifa 28 rS s 73, 2 ff Zsislu 27 Ts3ig.1 clad caps 2 And 3 with inlet 4 and outlet 5 nozzles, there is a piston 8 with overflow 9 and throttle holes, preloaded by springs 6 and 7 relative to the caps . In the radial bore of the piston 8 a spring-loaded plunger 13 with a hole 14 is installed, the cavity above the plunger communicating through channels 19, 20 and 18 with cavity B, and the cavity under the plunger through channel 22 - cavity G. For efficient operation, the projections of the covers 2 and 3 are made with channels 16 and 17. The adjustment of the springs 6 and 7 is carried out by the caps 2 and 3, and the springs 12 by the SCREW 23. The valve is put into operation in the initial period of filling and after the leakage is eliminated by a button lock. 5 il. 313, ffi O) 00 00 o Yu

Description

The invention relates to transport engineering, in particular to pneumatic systems of vehicles.

The purpose of the invention is to increase reliability,

FIG. 1 shows a safety valve for pvmesystems, operating mode; in fig. 2- the same emergency mode; in fig. 3 shows section A-A in FIG. 2; in fig. 4 — node 1 in FIG. 2; in fig. 5 is a section BB in FIG. 3

The protective valve contains body 1, two unified caps 2 and 3, forming end walls with inlet 4 and outlet 5 nozzles. Inside the housing 1 there is a piston 8 spring-loaded on both sides with springs 6 and 7 with an overflow hole 9 and a throttle hole 10 equipped with an adjusting screw 11. Inside the piston 8 there is a spring-loaded spring 12. A plunger 13 with a hole 14 and a sealing element 15. The piston divides the internal volume valves on the cavity C and D, which have the ability to communicate with the inlet and outlet nozzles 4 and 5 through the central openings of the covers 2 and 3 and their auxiliary valves 16 and 17, respectively. In addition, the cavity B can communicate via the channels 18 in the housing 1 and 19 in the piston 8 with the cavity above the plunger 13 via the channel 20 in the rod 21 of the retainer. The cavity D can communicate with the cavity under the plunger 13 through the channel 22 in the piston 8. The springs 6 and 7 are adjusted by covers 2 and 3, and the springs 12 by the screw 23. To prevent leaks during operation, the covers 2 and 3 and the piston 8 are provided with sealing elements 24-27, and for emergency operation, also with annular sealing elements 28 and 29.

The push-button lock consists of a stem 21 with a channel 20, a housing 30 with a threaded hole for the ball 31, springs 32 and a adjusting screw 33. The stem 21 is equipped with sealing rings 34 and 35 with a split ring 36 between them. With the rod 21 interacts inclined platform 37

piston 8.

The protective valve works as follows.

in a way.

In working condition, the pistol 8 divides the internal volume of the valve into cavities C and D, which communicate with each other through the throttle bore 10, the diameter of which is adjusted by the screw 11 depending on the air flow through the valve. The rod 21 of the push-button lock is in a fixed upper position with the help of spring-loaded 32 of the ball 31 and the adjusting screw 33 in the housing 30 and, thanks to the sealing rings 34 and 35, releasing the channels 18 and 9. The plunger 13 is fixed in its upper position by its spring

the compressor presses the sealing element 15, which creates a tightness of the central opening 9. In the event of a depressurization of the volume or pipeline behind the valve outlet port 5, a sharp drop in pressure occurs in the cavity G. Air from cavity B does not have time to flow through the throttle opening 10 to equalize the cavities C and D, and under the action of an overpressure of cavity B, the piston 8 sits on the annular sealing element 29 with the throttle bore 10, blocking the communication of the cavities B and G. Thus, the damaged teaching the drain is disconnected from the supply line. To actuate the valve after eliminating the leakage, it is necessary to push the retainer rod 21 until it stops. Channels 18 and 19 will thereby be connected by channel 20. Compressed air from cavity B rushes into the cavity above plunger 13 and causes it to descend, connecting cavity B to outlet pagrubkom 5 via central channel 9 and hole 14 in plunger 13. Rapid filling the volume of the pneumatic system. As the pressure in cavities C and D equalizes, piston 8 moves to the middle of the body, raising the oblique pad 37 of the retainer rod 21 to the upper fixed position, and plunger 13 rises by spring 12 due to pressure equalization above the plunger through channels 19, 20, 18 and below it through channel 22. Subsequently, the communication of the cavities C and D is carried out only through the throttle opening 10. In the case of the depressurization of the supply volume or the pipeline in cavity B, a decrease in pressure is observed. Now the air does not have time to flow from cavity D to cavity C, and the pressure difference causes piston 8 to land on element 28 of cover 2, blocking the throttle hole 10. Cavities C and D separate. To put the valve into operating mode, it suffices to supply air with an operating pressure to the inlet 4.

Claims (1)

Invention Formula A protective valve for pneumatic systems, comprising a housing in which a piston is installed, which separates the inlet and outlet cavities, communicated with coaxial piston holes in the end walls of the housing and between themselves by means of an overflow opening, characterized in that, in order to increase reliability, the piston is sealed in the housing by means of two sealing rings delimiting the intermediate cavity between them, is spring-loaded relative to the end walls of the housing and is made with a radial hole crossing the bypass hole, ying in the piston, wherein the radial bore of the piston plunger installed with a radial through-hole, the radial hole in the piston divided by the plunger into two cavities, one of which communicates with the intermediate cavity, and in the other, isolated from the intermediate cavity and communicated with the outlet cavity, a spring is installed that presses the plunger in the side wall of the housing to communicate the entrance cavity with the intermediate cavity, into which a lock in the form of a spool protruding into the intermediate cavity with the possibility of interaction with the guide surface on the surface end walls of the hull in concentric holes made in them are installed Sealing rings and a through throttle opening in the gunhole, which is blocked by a corresponding sealing ring when the gun is pressed against the end wall of the housing, with a bypass channel in each end wall that communicates the hole in it with the corresponding cavity. 28 .2 2lf 25W72 73757J 2ff 27 thirty 18. J4 2j 20 Fig L