RU129530U1 - HYDRANT FIRE UNDERGROUND - Google Patents

Abstract

Underground fire hydrant, containing a rod (2) located inside the housing (1) with a spindle (3) mounted on it, a valve made of two parts (5, 6) connected to a thread (7) and equipped with a rubber gasket (8) , guides (9) and a seat (4), characterized in that on the surface of the rubber gasket facing the seat, hemispherical point protrusions (10) are placed.

Description

The invention relates to the field of construction and mining, in particular, to water supply and can be used in devices designed for water intake from the water supply network for fire fighting.

Fire hydrants are used to take water during fire fighting, which take water from the water supply network for fire fighting. They are installed on water networks in wells on fire stands of various types on flanges, which are a shaped part of the water network [1, 2].

Hydrants are a branch that is installed on a tee or fire stand on a fire or water supply network.

Structurally, hydrants are performed in accordance with the specified GOSTs and are produced as products of the same type [3, 4] with minor changes [5].

Famous, taken as a prototype, an underground fire hydrant, also manufactured in accordance with GOST 8220-85 (Utility model of the Russian Federation No. 21744 "Underground fire hydrant" which is made in the form of a housing (1), inside which there is a rod (2) with square ends (3) , and spindle (4), In the lower part of the body (1), a seat (7) of the valve (9) (valve seat) is made.The valve, in turn, is made of upper (10) and lower (11) parts connected between by means of a threaded connection (12), between which a rubber gasket (13) is located.

The disadvantage of hydrants produced in accordance with GOST 8220-85 is sticking of the valve and destruction of rubber when opening or closing the hydrant, when a gap is formed between the rubber gasket and the lower part of the body, leading to water hammer.

Sticking of the valve leads to the fact that it is necessary to exert great efforts when opening the hydrant, which leads to the rotation of the rod in the spindle coupling. In addition, due to large vibrations when opening and closing the hydrant, the two parts of the valve are unscrewed from each other. These disadvantages reduce the reliability of the hydrant.

The nature of this phenomenon is as follows. When opening the valve, its upper and lower parts fall down, opening a small gap between the rubber gasket (13) and the body (1). A moving stream of water from the water supply increases its speed of movement, which in the gap (as the place of the minimum cross-section) reaches the minimum pressure after a while, up to the rarefaction, which tends to pull the rubber gasket to the body and completely close the gap, which entails stopping the water flow increasing in the pipeline and, in turn, leads to bending of the rubber or even to a hydraulic gift and the destruction of the pipeline.

The purpose of the utility model is to increase the reliability of the hydrant.

To achieve this goal, it is proposed to change the shape of the contact surface of the rubber o-ring in place of its contact with the housing.

The technical result is the placement on the contact surface of the rubber sealing ring hemispherical protrusions.

The design of the underground fire hydrant is illustrated by drawings, where:

figure 1 shows a General view of the hydrant;

figure 2 shows the hydrant valve;

figure 3 shows the structure of the contact surface of the rubber seal.

An underground fire hydrant (Fig. 1) is made in the form of a housing (1), with a rod (2) located inside and equipped with a threaded spindle (3) and a valve seat (4) below. The valve (figure 2), in turn, is made of upper (5) and lower (6) parts interconnected by a threaded connection (7), between which there is a rubber gasket (8) with spherical floors located on its surface point protrusions (9). Valve guides (9) give axial stability to the valve.

Hydrant fire underground works as follows. The hydrant is installed on a fire stand (not shown in the drawing) in the water supply network so that the lower part of the valve (6) is in the water, and since it is pressed against the seat 4 (valve seat), the internal hydrant cavity is isolated and the water from the network to it does not arrive. The rotation of the rod 2 with a fire column key (not shown in the drawing) transmits torque to the spindle (3) equipped with a running thread. This rotation causes a vertical downward movement of the lower part of the valve (6), since the valve guides (9) installed in the housing 1 do not allow it to rotate. Closing the hydrant is done by rotating the rod 2 in the opposite direction, which leads to the lifting of both parts of the valve until it is completely in contact with the seat 4 and closing the possibility of water entering the hydrant from the network. Hemispherical protrusions (10) prevent a quick reduction of the gap and make it possible to equalize the water pressure in the pipeline and the hydrant body, which prevents the bushing of the rubber gasket (8) and the sharp collapse of the gap, leading to hydraulic shock, which increases the reliability of its operation.

Information sources

1. GOST 8220-85 Fire hydrants underground. Technical specifications

2. GOST R 53961-2010 "Fire-fighting equipment. Underground fire hydrants. General technical requirements. Test methods" (approved by order of the Federal Agency for Technical Regulation and Metrology of November 25, 2010 No. 522-st)

3. Fire hydrant underground P 31.000 of the plant ROSarma - http://rosarma.ru/catalogue/pozharnoe_oborud/gidrant_p_31000/

4. Fire hydrant underground P.30 plant AVI-system - http://www.7807898.ru/shop/gidranty-vodmashoborudovanie/pozharnyj-gidrant-p-30-000#

5. Utility model of the Russian Federation No. 21744 "Fire hydrant underground"

Claims (1)

Underground fire hydrant, containing a rod (2) located inside the housing (1) with a spindle (3) mounted on it, a valve made of two parts (5, 6) connected to a thread (7) and equipped with a rubber gasket (8) , guides (9) and a seat (4), characterized in that on the surface of the rubber gasket facing the seat, hemispherical point protrusions (10) are placed.

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