RU210425U1 - Locking and starting device for fire extinguishers - Google Patents

Abstract

The utility model relates to fire-fighting equipment and can be used in the development and production of shut-off and starting devices used in fire extinguishers. SUBSTANCE: locking and starting device for fire extinguishers contains a housing with inlet and outlet channels for supplying a fire extinguishing agent, a shut-off valve located coaxially with the inlet channel for supplying a fire extinguishing agent and made in the form of a stem fastened to a spring-loaded locking element, and a seal interacting with the locking element of the rod, a handle for transportation, rotary stem control lever, safety valve. The device additionally contains a steel sleeve made with an internal thread for connection with the body and an external thread for connection with a fire extinguisher cylinder, the body is made in a mold and connected to the steel sleeve by means of a threaded connection, and a sealing element is installed in the connection to ensure the tightness of the connection, and a channel is formed in the body, connecting the internal cavity of the safety valve with the internal cavity of the steel sleeve, in which the spring, the locking element and the seal are placed. The technical result of the proposed solution is to increase the reliability of the device by simplifying the design and using more reliable connections in the product. 1 ill.

Description

The utility model relates to fire-fighting equipment and can be used in the development and production of shut-off and starting devices used in fire extinguishers.

A shut-off and starting device for a fire extinguisher is known (RF patent 2176924, IPC A62C 13/76, publ. 12/20/2001), which includes a body made of non-ferrous metal, equipped with an element for attaching to the fire extinguisher tank and a means for attaching handles, including a groove and an axis, a shut-off a device that includes a stem with a shut-off valve fixed on it and a spring with its fastening elements, while the body is provided with at least two radial holes, and the spring with its fastening elements is located at the end of the stem opposite to the end of the fastening of the shut-off valve, and is placed in the upper part of the device outside the outer dimensions of the housing, and the means for fastening the handles is made with the exception of the possibility of rotation of the handles by means of at least one flat located on the housing.

The main disadvantage of this solution is the need to manufacture it from a non-ferrous metal with a higher density than aluminum alloys, due to the need to ensure the stability of the structure to high loads, which makes it expensive.

A shut-off and starting device for a fire extinguisher is known (RF patent 115214, IPC A62C 13/00, publ. 04/27/2012), which contains a housing with elements placed on it for connection with a fire extinguisher tank, for installing a pressure indicator and a spray nozzle, a handle, a lever control, rod, spring, siphon tube. The body of the locking and starting device is made in the form of a hollow cylinder and is made of metal, such as aluminum or brass, by hot pressing. Structural elements such as a spray nozzle (nozzle) and a pressure indicator can be made in one piece with the body of the shut-off device.

The main disadvantage of this technical solution is the need to use heat-resistant expensive molds, their rapid wear and, as a result, their low productivity. Also, the body of the device has thinned places that are not able to withstand a significant load, in particular in connection with the fire extinguisher tank.

A shut-off and starting device for a fire extinguisher is known (RF patent 2327496, IPC A62C 13/00, publ. 06/27/2008), which contains a head fastened to a cylinder and made with inlet and outlet channels for supplying a fire extinguishing agent. A bushing is installed on the threaded head, made with a flange on one side and with an annular collar on the other. The stem is spring-loaded relative to the head and installed in the hole of the sleeve with the possibility of interaction between the locking element and the annular shoulder of the sleeve, which acts as a valve seat. The rotary control lever and the handle for transportation with the base for fastening are located in the head at an angle to its axis. For fastening under the flange of the bushing, the base of the handle is made with a mounting groove covering the bushing under the flange, which presses the base of the handle to the head. The rotary lever is made with a threaded hole and is connected to the rod through a pusher made in the form of a screw with a lock nut. The material for the head is shaped rolled aluminum alloy, which is processed first by pressing and then by drawing, and for the sleeve - brass.

The disadvantage of this device is the multi-stage processing of the material, which leads to an increase in the complexity of its manufacture, which reduces the efficiency of the pneumatic shut-off equipment. Another disadvantage of casting one-piece castings is the presence of time-consuming post-processing. The device has a complex asymmetrical shape with crossed holes with high requirements for surface finish and the presence of threads.

The closest analogue is a shut-off and starting device for fire extinguishers (RF patent 109414, IPC A62C 13/00, publ. 10/20/2011), containing a head, with inlet and outlet channels for supplying a fire extinguishing agent, a body with a threaded connection for fastening with a cylinder, a shut-off a valve located coaxially with the inlet channel for supplying fire extinguishing agent and made in the form of a stem fastened to a spring-loaded locking element, and a seat interacting with the locking element of the stem, a handle for transportation, a rotary stem control lever and a pressure gauge, the head is made in an injection mold and is rigidly connected to housings of the shut-off and starting device and the pressure gauge by jointly pouring them with a melt of metal or plastic, while the housings are interconnected by a channel isolated from the head. The head is made of aluminum alloy or heat resistant thermoplastic. The body of the shut-off and starting device is made by stamping from sheet steel and is made in the form of a threaded bushing with a support flange, the outlet channel of which has the shape of a valve seat and is provided with bent edges. The manometer case has a stepped cylindrical shape and is made of thin sheet steel by stamping.

The disadvantage of this technical solution is the rather high complexity in manufacturing, as well as the resulting unreliable connection of the head with the housings of the shut-off device and the pressure gauge due to the insufficiently thought-out shape.

The technical result of the proposed solution is to increase the reliability of the device by simplifying the design and using more reliable connections in the product.

The technical result is achieved due to the fact that in the shut-off and starting device for fire extinguishers, containing a housing with inlet and outlet channels for supplying a fire extinguishing agent, a steel sleeve with a threaded connection for fastening to a cylinder, a shut-off valve located coaxially with the inlet channel for supplying a fire extinguishing agent and made in in the form of a rod, fastened with a spring-loaded locking element, and a seal interacting with the locking element of the rod, a handle for transportation, a rotary lever for controlling the rod, moreover, the body is made in a casting mold from a casting alloy and is rigidly connected to a sleeve for fastening with a cylinder, the body is connected to a steel sleeve by means of a threaded connection, and a channel is formed in it, connecting the internal cavity of the safety valve with the internal cavity of the steel sleeve, in which the spring, the locking element and the seal are placed.

The use of a threaded connection between the body of the device and the sleeve can significantly improve the manufacturability and reliability of the technical solution, as well as reduce the complexity of manufacturing and simplify access to the internal surfaces and parts of the device.

The manufacture of the sleeve from steel also allows for a strong and reliable connection without increasing the cost and weight of the structure.

The shut-off and starting device for fire extinguishers is characterized by a drawing, which shows a section of the general view of the shut-off and starting device.

SUBSTANCE: locking-starting device comprises a housing (1) with inlet and outlet channels for supplying fire extinguishing agent, a sleeve (2) with a threaded connection for fastening with a cylinder, a shut-off valve located coaxially with the inlet channel for supplying fire extinguishing agent and made in the form of a rod (3) fastened with spring-loaded (4) locking element (poppet) (5) and seal (6), rotary lever (7) for stem control (3), handle (8) for transportation, safety valve (9) with stainless foil bursting disc. The housing (1) is made in a casting mold from a cast alloy and is connected to the bushing (2) of the shut-off and starting device made of steel using a threaded connection (10). The cavity of the sleeve (2) of the shut-off and starting device and the cavity of the safety valve (9) are connected to each other by a channel (11) through the membrane. Also, a spring (4), a plate (5) and a seal (6) are installed in the cavity of the bushing (2).

The bushing (2) of the shut-off and starting device is made with an internal thread for connection with the body (1) and an external thread for connection with the cylinder. The bushing was made on a bar lathe machine.

The locking and starting device for fire extinguishers is made as follows.

Manufacture of the body (1) in an injection mold by pouring a casting alloy melt provides a ready-made base for installing the components of the starting device and a channel (11) for connecting the cavity of the safety valve (9) and the cavity of the bushing (2). Next, threading is performed on the reinforced lower part of the body (1) for connection with the sleeve (2), also in the hole for installing the safety valve (9) and in the connecting pipe (12). This thread is used in the future to attach spray devices. The assembly of the stem (3) begins. The seal (6) is installed and the plate (5) is fixed with an interference fit, while ensuring the preload of the seal (6). The stem (3) is inserted into the body (1) of the shut-off and starting device, after which the spring (4) is installed and the steel sleeve (2) is screwed, while a sealing element is installed in the groove of the sleeve, ensuring the tightness of the connection

The device works as follows.

After manufacturing, the shut-off and starting device is screwed into the connecting hole of the cylinder, the injection nozzle is connected to the pipe 12, after which the assembler presses the rotary lever 7 of the control rod 3, liquefied carbon dioxide is supplied to the pipe of the LPU body and the fire extinguisher is filled with it. After the assembler releases the lever 7 by the force of the spring 4 and the pressure in the cylinder, the stem 3 is pressed against the valve seat of the body 1, the cylinder becomes sealed.

To prevent unintentional operation of the fire extinguisher, a pin is inserted into the hole on the handle 8 and lever 7 and the fire extinguisher is sealed.

In this state, the fire extinguisher can be stored for the entire warranty period declared by the manufacturer (about 5 years).

In the event of a fire, the operation of the shut-off and starting device occurs as follows. The consumer pulls out the pin and presses the rotary lever 7 of the rod control, which presses on the head of the rod 3, as a result of which the locking element 5 is lowered and under the pressure in the cylinder through the pipe 12 carbon dioxide is released into the fire.

After use, the fire extinguisher can be recharged.

To protect the fire extinguisher cylinder from rupture, due to excess of the permissible pressure, let's say from temperature or other influences, a bursting disc is hermetically installed in the body of the fire extinguisher. It breaks when the pressure exceeds the allowable one and the pressure in the cylinder is released.

Claims (1)

Shut-off and starting device for fire extinguishers, comprising a housing with inlet and outlet channels for supplying a fire extinguishing agent, a shut-off valve located coaxially with the inlet channel for supplying a fire extinguishing agent and made in the form of a stem fastened to a spring-loaded locking element, and a seal interacting with the locking element of the rod, a handle for transportation, a rotary stem control lever, a safety valve, characterized in that the device additionally contains a steel sleeve made with an internal thread for connection to the body and an external thread for connection to the fire extinguisher cylinder, the body is made in an injection mold and connected to the steel sleeve by means of threaded connection, and a sealing element is installed in the connection, ensuring the tightness of the connection, and a channel is formed in the body connecting the internal cavity of the safety valve with the internal cavity of the steel sleeve, in which a spring, a locking element and seal.

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