RU2092204C1 - Shutoff-and-starting device for fire-extinguishing plants - Google Patents

Abstract

FIELD: fire-fighting equipment; may be used in starting of group drives of quick-acting plants of automatic fire extinguishing in production units characterized by high fire-explosion hazard. SUBSTANCE: device has body, inlets and outlets of fire-extinguishing fluid, breaking diaphragm covering inlet, sleeve embracing body and forming annular channel together with body. Body accommodates spring-loaded piston with rod. Plant has means for breakage of diaphragms, gas chamber and explosive charge. Means for diaphragm breakage is made in form of rope linkage. Body has device for manual starting. Piston and device for manual starting are mounted coaxially in body. Annular channel out. let is labyrinth. Diaphragm is made of fragile material, mainly, of ceramic materials. EFFECT: higher efficiency. 3 cl, 5 dwg

Description

 The invention relates to fire fighting equipment and is intended to run group drives of high-speed automatic fire extinguishing installations in industries characterized by a high degree of fire, explosion hazard.

 A locking and starting device for fire extinguishing installations is known, comprising a housing with openings for the entry and exit of liquid fire extinguishers, a bursting membrane covering the inlet, a sleeve covering the housing and forming with it an annular channel, a spring-loaded piston with a rod located in the housing. The device has a membrane destruction means, a gas chamber having a supra-piston cavity isolated from the passage of the extinguishing fluid by a septum, and a pyro cartridge (SU, ed. St. 330907, class A 62 C 37/06, 1990). This device is accepted as the closest analogue.

 A disadvantage of the known device is the destruction of the membrane in a place close to its closure, in addition, it does not have a manual start, which reduces its reliability during periods of lack of electricity, major accidents.

 The task at hand is reduced to increasing the efficiency of the locking and starting device.

 This drawback is eliminated by the fact that the membrane destruction means is made in the form of a cable connection, enveloping the rod mounted in the housing from the side facing the outlet in such a way that one end is rigidly attached to the piston rod and the other to the center of the membrane. The housing is equipped with a manual starter having an additional cable connection enveloping the core of the membrane destruction means and at one end rigidly attached to it in the center. The piston and the manual starter are mounted in the housing coaxially and coaxially with the rod end of the cable connection of the destruction means, the membrane and the other end of the additional cable connection of the manual starter located coaxially with the rod. The annular channel at the outlet is labyrinthine. Membranes are made of brittle material, mainly ceramics.

 The manufacture of a membrane from brittle material can reduce the fracture forces during a sudden movement of the piston. The destruction of the membrane in the known device occurs in several stages. First, a membrane made, for example, of polyethylene or metal foil, is plastically deformed, and then its destruction along the perimeter already occurs (after reaching the maximum allowable stresses).

 The use of cable ties as a means of destruction of the membrane allows, firstly, to simplify its design, and secondly, to mount the named connection in the center of the membrane, in the so-called "critical" point, thereby ensuring the least effort to break the membrane.

 The use of a rod in the design, which is a supporting element at the place of enveloping by cable ties, allows you to distribute the fracture force from the piston or manual starter to the membrane.

 Fulfillment of cable ties with deflection after bending the rod allows, firstly, to facilitate their installation on the membrane, eliminating its involuntary destruction, and secondly, to carry out the destruction of the membrane at the moment when in the first case the piston accelerates and acquires a certain kinetic energy, and in the second case, the hand of the worker will develop the necessary effort.

 The use of additional cable communication allows you to simplify the design of the manual start device.

 The coaxial placement of the piston, the manual start device and the branches of the cable ties to the bending of the rod eliminates possible distortions of the structural elements during the main and duplicate start.

 The execution of the annular channel at the labyrinth outlet allows it to cool the combustion products due to the intensification of heat transfer.

 In addition, this embodiment of the design of the locking and starting device allows to simplify the design by eliminating from it a discharge hydraulic chamber into which the extinguishing fluid enters after the membrane is destroyed and then is removed together with the exhaust products of combustion into the atmosphere.

 In FIG. 1 shows a device (General view in section); in FIG. 2 the same when pulling the branches of the cable connection of the main start after bending the rod when the pyro cartridge is triggered; in FIG. 3 the same at the end of the stroke of the piston; in FIG. 4 view of the sleeve in the plan; in FIG. 5 view of the removable hatches of the body.

 The device comprises a housing 1 with openings 2 and 3 for the entry and exit of the extinguishing fluid, a bursting membrane 4, overlapping the inlet 2. The membrane 4 is made of brittle material, such as ceramic. Inside the housing in the gas chamber 5 there is a piston 6 with a rod 7.

 The gas chamber 5 has a piston cavity 8 with openings 9 for starting gases from the latter and a piston cavity 10 isolated from the passage of the extinguishing fluid by the partition 11. The piston cavity 10 communicates with a diametrically located channel 12 in which the pyro cartridge is installed 13. From the side of the supra-piston cavity 8 a conical spring 15 is mounted between the piston 6 and the cover 14 mounted on the housing 1. A sleeve 16 is installed on the cover 14, consisting of two half rings 17 and 18 (see Fig. 4), which are rigidly fixed to the sleeve using The bolts 19 and 20. The sleeve has an annular channel 21 made at the outlet by a labyrinth for intensifying heat transfer.

 The destruction tool of the proposed device is made in the form of a cable connection of the main start, envelope from the side of the outlet 3 of the rod 22, mounted diametrically in the last and perpendicular to the gas chamber 5. Moreover, the branch 23 of this cable connection under its own weight is in tension and is fixed rigidly to the rod its end through the eye of the screw 24 mounted on the rod 7.

 The second branch 25 of the cable connection of the main start-up after the bending of the rod 22 is located in the standby position with a deflection and is fixed rigidly to the membrane with its end through the eye of the screw 26 mounted in the center of the membrane 4.

 The device has a manual start device 27, which is mounted on the housing 1 between the inlet and outlet openings opposite the rod 7.

 The device 27 contains a finger 28 installed in the hole 29 of the housing 1. The finger 28 has a shoulder 30. The hole 29 is closed externally by the cap 31. Between the cap 31 and the shoulder 30 of the finger 28 there is a spring 32. The finger 28 through the holes 33 enters the internal cavity of the housing between the holes 2 and 3. At the end of the finger there is an eye 34, on which the branch 35 of the additional cable connection is rigidly fixed at one end, which, after bending the rod 22, forms the second branch 36. The branch 36 is located in the standby position with a deflection and is rigidly fixed to end in the eye of the screw 26.

 The branches 23 and 35, prior to being enveloped by the cable ties of the rod 22, as well as the piston and the manual starter together with the finger 28, are mounted coaxially in the housing.

 For mounting the branches 23, 25, 35 and 36 in the respective eyes, removable hatches 37 and 38 are provided (Fig. 1 and 5), which are mounted on the housing 1 opposite the inlet and outlet openings 2 and 3.

 The device operates as follows.

 In the event of a fire, the electric signal from the fire detector is fed after amplification to the igniter charge 13. As a result, the charge is triggered, and the combustion products (mainly gaseous) through the channel 12 enter the sub-piston cavity 10 and quickly create significant overpressure there. Moreover, the piston 6 sharply moves upward, while pulling the branch 25 of the cable connection of the main start (Fig. 2). At this moment, the piston 6 accelerates and acquires the necessary kinetic energy to destroy the membrane 4, the remnants of which are then washed off with a fire extinguishing liquid (Fig. 3).

 Subsequently, the piston, moving upward, completely compresses the spring 15 and abuts against the cover 14. The exhaust gaseous products of combustion enter through the openings 9 into the labyrinth annular channel 21, in which intensive heat exchange takes place, and the temperature of the gases decreases to safe values. The screw 26, carried away by the flow of extinguishing fluid, pulls the corresponding branches of the cable ties and is held by them at the exit (Fig. 3).

 After the end of the operation of the device, the membrane 4 and cable ties are installed using the removable hatches 37 and 38 to install the latter.

 Duplicate start of the claimed device is carried out manually using a cable 39, which, moving the finger 28, pulls the additional cable connection with the subsequent destruction of the membrane 4.

Claims (3)

 1. A locking and starting device for fire extinguishing installations, comprising a housing with openings for the entry and exit of the extinguishing fluid, a bursting membrane covering the inlet, a sleeve covering the housing and forming with it an annular channel, a spring-loaded piston with a rod placed in the housing, a destruction tool membranes, a gas chamber having an over-piston cavity with openings for the release of gases and a under-piston cavity isolated from the passage of the extinguishing fluid by a partition, and a pyro cartridge, we note that the membrane destruction means is made in the form of a cable connection, enveloping the rod mounted in the housing from the side facing the outlet, so that one end of it is rigidly attached to the piston rod, and the other to the center of the membrane, the housing is equipped with a manual start device having additional cable connection enveloping the core of the membrane destruction means and at one end rigidly attached to it in the center, while the piston and the manual starter are mounted in the housing coaxially and coaxially with them rod end of rope connection means breaking the membrane and the other end of the additional tether connection manual actuation device.  2. The device according to claim 1, characterized in that the annular channel at the outlet is made labyrinth.  3. The device according to claim 1, characterized in that the membrane is made of a brittle material, mainly ceramic.

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