SU990626A1 - Emergency arrestor - Google Patents

Description

(54) EMERGENCY STOP

one

The invention relates to a lifting and transport machinery, in particular, intended for seismic protection and emergency containment of high pressure pipelines having a thermal displacement.

An emergency stop is known, primarily for holding pipelines, comprising a housing in which there is a swivel connected to a stop-resistant object, squibs with outlets, connected to a source of an emergency signal, and a sectional plate stop (1.

The disadvantage of this emergency stop is the inconvenience of its maintenance, since the replacement of a defective igniter in it is associated with disassembling the device itself, which leads to an increase in the complexity of its repair. .

The purpose of the invention is to reduce the complexity of the repair.

For this purpose, in the emergency stop, the brush is made with an annular groove, with the specified stop mounted inside the bracket with a gap relative to it, and the squib from the outside of the case, fitted with

its walls are prisms that divide said gap into cavities connected to the outlet openings of the squibs.

FIG. 1 shows an emergency stop,

lengthwise cut; in fig. 2 - the same

5 cross section; in fig. 3 - layout

two emergency stops on the pipeline.

The emergency stopper consists of a housing 1 with a stop 2 and a pyro mounted on it, 0 chuck 3 and a stem 4 with an annular groove 5. The stop 2 consists of several sections assembled from plates assembled in cages 6 and connected by studs 7. Sockets 6 and the studs 7 are made of easily deformable material. The sleeves are divided between 15 prisms 8 fixed by screws 9, and between the housing 1 and the holders 6 there are cavities 10 connected to the outlet openings of the squib 3. The through holes 11 are filled at the groove 4 and the center 11 are filled with the through holes. installed on the outside of the housing 1 and connected to an alarm source, for example, of inertial type (not shown). The emergency stop is connected to the retained pipeline 12.

through ring 13 and rests on support 14.

Emergency stop works as follows.

In a trouble-free mode of operation, the pipe 12 under the action of thermal expansion moves, and with it the brush 4 with the bore 5 relative to the housing 1 with the stop 2 moves unhindered. When an alarm signal arrives at the cutters 3, they are undermined, the resulting gases press against the clips 6, which are deformed, the plates of the stop 2 break the fragile studs 7 and some of them enter the groove 5 of the rod 4. The movement of the rod 4, and with it the pipeline 12, is terminated. The holes 11 in the stem 4 serve to reduce the pressure in the annular bore 5, and the prisms 8 serve as guide sections for the stop 2 and reduce the effects of the gas of the squib on the other sections of the stop, which increases the reliability of the emergency stop.

The application of the proposed device greatly simplifies installation and maintenance of the emergency stop, since the replacement of a defective squib, it is not associated with disassembling the device itself and further adjusting it, since the squib in it is installed on the external side.

As a base object for comparison, the adopted hydraulic system of the HSP type was manufactured by the Japanese company The Wako koeki Co., LTD, purchased by Soviet foreign trade organizations to protect the steam generators of the Armenian Nuclear Power Plant from seismic loads, consisting of a cylinder with a working fluid and a piston sharing the working volume of the cylinder into two parts, which communicate with each other through an α-valve. Mentioned hydraulic system has all the disadvantages of hydraulic systems of a general nature and additional ones associated with its use in conditions of increased radiation. This is the radiolysis of the working fluid, leading to the formation of a gas phase and polymerization. The gas phase and solids in the working fluid make the operation of the valve and throttling devices unreliable, which can lead to an accident.

The use of a pyro cartridge-controlled stop in the proposed device and the absence of a working fluid allows the proposed device to operate reliably for a long time without servicing in conditions of increased radiation and distinguishes it favorably from the well-known HSP hydraulic system. The use of the proposed emergency limiter allows a significant reduction in the radiation dose of personnel serving the emergency limiters installed on the NPP equipment.

Claims (1)

Invention Formula An emergency stop, mainly for holding pipelines, comprising a housing in which a rod is connected, connected to a storable object, squibs with outlets, connected to an alarm source, and a sectional plate stop, characterized in that, in order to reduce the labor intensity of repair, the rod made with an annular groove, while the specified stop is installed inside the case with a gap relative to it, and the squib - from the outside of the case, equipped with a prize mounted on its walls s, cases said conductive gap in the cavity connected to the outlet apertures squibs. Sources of information taken into account in the examination 1. USSR author's certificate on for Vka Yag 2911098/11, class B 66 B 5/02, 1981 (prototype). - ( 1