SU1323116A1 - Starting valve for supplying liquid - Google Patents

Abstract

The invention relates to fire fighting equipment, in particular, to devices for supplying extinguishing liquid to switchgears, and allows to increase the response speed. The starting valve includes a housing 1 with an inlet nozzle 3 and a hole in the bottom 5. Inside the cylinder there is a piston with a rod with a retainer in the form of an inner and one outer cage. The inner race is spring-loaded and located inside the piston with the possibility of axial movement, and the piston rod is made with a through hole and a thermal booster is placed inside it. 4 il. / 7 (L 77 with tc 00 a

Description

113

FIELD: fire fighting equipment, namely, fire extinguishing fluid supply devices for switchgear.

The purpose of the invention is to increase the valve speed.

FIG. 1 shows the valve in the standby position; in fig. 2 - the same, after srabatshan; Figs. 3 and 4 show the options for fixing a spring-loaded element using a thermal actuator made on a memory alloy and a low-melting alloy, respectively.

Fluid Start Valve

It contains a cylindrical hollow body 1 with a lid 2, a supply pipe 3 at the bottom and an outlet A in bottom 5, a piston 6 with a hollow rod 7, a thermal booster 8 placed inside the body, a ball 9 retainer including an internal 10 and an external 11 cage. The piston has through holes 12 on the side walls for the balls. Moreover, the inner race 13 is spring-loaded and placed with the possibility of axial movement inside the piston, and is externally fixed on the inner surface of the housing. In addition, the inner shell is made hollow and pin 14 is attached to its inner part.

The piston rod has a through hole 15 in which a thermal booster 8 is mounted, fastened on one side with a pin 16, and the other with a pin 14 of the yoke. A damping gasket 17 is placed in the lid 2. To prevent self-loosening, the lid is secured to the body thread with a lock nut 18.

As a thermosensitive element of the heat driver, a synthetic thread 8, a plate or wire 19 from a memory having a memory effect, or a low-melting alloy 20 with which the metal parts of the driver can be welded can be used.

The clip 10 is locked with a lock based on a thermosensitive synthetic yarn as follows (Fig. 1).

The synthetic thread 8 is covered with the pin 14 of the yoke 10. Thereafter, the ends of the yarn are passed into the through hole 15 of the piston rod and secured with a pin 16. The yoke 10 at

ABOUT

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0

50

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This is positioned so that the balls 9 abut against its outer surface, and the groove of the sleeve is below the radial holes with the balls.

A heat alloy booster with a memory effect (Fig. 3) is a plate or wire 19, which at curved temperatures have bent ends. With these ends, the pins 14 and 16 are gripped, whereby the sleeve 10 is kept from axial movement. Similar functions are performed by a thermal booster, in which the metal parts 21 and 22 are fused together with a low-melting alloy 10 (FIGS. 3 and 4).

The starting valve of the fluid supply operates as follows.

In the event of a fire, heat-sensitive elements begin to react to a rise in temperature as follows.

Depending on the chemical rock, the synthetic thread softens in the temperature range from 70 to 200 ° C, loses its strength and breaks. At higher temperatures, the thread may burn out.

In the case of an alloy with a memory effect, as the temperature rises, the folded end of the plate 19, covering the pin 16 of the protruding part of the piston rod, begins to restore its straight shape, fixed by its structural memory and straightened.

In a fusible alloy inducer, as the temperature rises, as a result of the melting of alloy 20, parts 21 and 22 decay. The operation of any type of driver leads to the release of the yoke 10. At the same time, the spring 13 moves the yoke upwards. When the groove of the sleeve 10 is aligned with the balls 9, the latter fall into the groove and release the fixation from the piston 6. In the standby position in the lower cavity of the housing there is water under working pressure. Therefore, the piston moves upwards under the pressure of water and opens the outlet 4, after which the water goes to extinguish the fire in the protected device.

The proposed design of the liquid supply start valve allows

one

do without a remote thermal driver connected by a hydraulic tube to the upper cavity of the housing. At the same time, there is air in the upper cavity of the housing and there is no liquid, the outflow of which through the external thermal booster determines the time of movement to the upper position of the piston. It is known from fluid dynamics that, under equal external conditions, the rate of outflow of gases is much higher than the speed of outflow of liquid. The length of the through hole in the rod, as a rule, is significantly less than the length of the hydraulic tube of the external thermal driver, respectively, less than its hydraulic resistance. As a result, the time to reach the operating mode of the flow into the device is less. In addition, the design is lighter and more compact. The use of the device in the systems of automatic fire extinguishing of technological devices allows for more efficient extinguishing of fires at the expense of speed.

with JO (5 20 25

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A fluid supply start valve containing an lp hollow hollow body with a lid, an inlet at the bottom and an outlet in the bottom, a piston with a hollow stem located inside the housing, and a thermal booster, characterized in that, in order to improve speed, it is equipped with a ball retainer in the form of an inner and outer cage, and the piston has through holes in the side walls for the retainer balls, the inner cage being axially displaced inside the piston and spring-loaded relatively not first, and externally secured to the inner surface of the housing, wherein the stem is made with a through hole to communicate the inner cavity of the stem with the atmosphere, and the thermal booster is placed in the zone of the through hole of the stem and serves to fix the inner race against the piston.

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VNIIPI Order 2894/7 Circulation 429 Subscription

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Production polygr., Uzhgorod, st. Project, 4

Claims (1)

A start-up valve containing a cylindrical piston with a cap leading in the lower part and an outlet in the bottom, a piston with a hollow rod placed inside the housing, and a thermal inducer, characterized in that, in order to increase speed, it is equipped with a ball lock in the form of internal and external the cage, and the piston has through holes in the side walls for the balls of the retainer, and the inner casing is located with the possibility of axial movement inside the piston and is spring-loaded relative to it and the external is fixed to the surface of the housing is made with end-to-end communication between the inner and the atmosphere, and the thermal stimulator is located in the zone of the through-hole of the stem and serves to fix the inner casing relative to the piston’s inner hole with the stem for the stem cavity