RU2342583C1 - Precautionary-shutting off gas device - Google Patents

Abstract

FIELD: machine manufacture.

SUBSTANCE: invention relates to the field of protective devices for gas and is meant for automatic turn off of gas supply in case of an increase or decrease of the control pressure. Device contains a case, lid, adjusting spring and regulating components for the settings of the set-up parameters. The first plunger pin is longitudinally prolate form set in the first plug. It is mounted on the casing flange. On the body is placed a shut-off valve and a sleeve is attached. A membrane is attached between the case and the lid. The leverage mechanism consists of the second plug and a lever. The second plug is fixed on the case perpendicular to the first rod and has a channel in the lower part. Through this pipe the second rod presses to the face of the sleeve a ball. Levers are fixed on the second rod. The third sleeve is mounted on the first sleeve in line with it forming between them a clearing space for the exiting of air. The clearing space is connected through the hole to the flange of the case with the atmosphere. On the first rod there is a ring-shaped protrusion. It divides the internal space of the bushings into two air-tight separate cavities: till the ring-shaped protrusion for joining it with the atmosphere and after it for the outlet to the gas pressure regulator. Cross-sectional area of the rod is equal to the cross-sectional area of the ring-shaped protrusion. The first rod has two holes. First hole - is non-opening located along the rod. The second - radial through attached to the first hole and located after the ring-shaped protrusion.

EFFECT: improving accuracy of the operation of the device.

3 dwg

Description

The invention relates to gas safety devices and is intended to automatically stop the gas supply in the event of an increase or decrease in the controlled pressure in excess of predetermined limits.

Known safety shut-off valves (Shur IA "Gas control points and installations." Publishing house Nedra. 1985, S. 120-123). These valves have a valve body with a seat, which, when activated, is blocked by a poppet plunger with a soft seal. An increase or decrease in the controlled pressure over predetermined limits leads to the displacement of the membrane and, as a result, to the landing of the plunger on the seat and the termination of gas passage.

Shut-off valves are also known (A. I. Revin and others. "Regulating and safety equipment for modern gas supply systems." Publishing House of Saratov University, 1989, pp. 106-109), which consist of a housing in which the rotary axis is located, with a shut-off valve and a rotary lever rigidly fixed to it. A control device is mounted on the housing.

Also known is a safety shut-off gas device (patent RU 2293896), which has a housing, a cover, tuning springs, adjusting elements and a chamber with a membrane installed in it. The membrane is mounted on a movable rod, which is connected to the pusher, which in turn is connected to the second rod. This rod is perpendicular to the first rod and connected to the third rod, on which the shut-off valve is located.

However, the aforementioned analogues are characterized in that the accuracy of operation in the devices depends on the inlet pressure, which leads to a decrease in the quality of the shut-off valve, including the possibility of emergency situations.

Closest to the claimed technical solution is a safety shut-off device built into a gas pressure regulator type 123-BV manufactured by Gas Teh (Gas Teh brochure attached). The device consists of a cover with set-up springs and adjusting elements for adjusting the set parameters, a housing in the flange of which the first sleeve is installed, sleeves, a membrane made between the cover and the housing, a lever mechanism. In the first sleeve there is a shut-off valve rod, on which a shut-off valve and a spring moving this valve are fixed. The lever mechanism consists of a second sleeve fixed in the housing and having a channel in the lower part, and a second rod made in it with levers fixed on it. The second sleeve and the second stem are perpendicular to the shutoff valve stem. The second rod through the channel in the second sleeve presses the ball to the rod of the shut-off valve and to the end of the sleeve.

However, in this technical solution there is a lack of accuracy in the operation of the safety shut-off gas device, which leads to a decrease in the quality of work, including the occurrence of emergency situations, because response accuracy depends on the input pressure.

Depending on the magnitude of the inlet pressure, a force equal to:

F ₁ = P _in. × S _pcs. ,

where F ₁ - the force acting on the rod,

R _I - inlet pressure in the regulator,

S _pc - cross-sectional area of the rod.

This force F ₁ has a variable character and depends on the magnitude of the inlet pressure in the connected regulator. Change Pvc. leads to a change in the force of interaction of the ball and the sleeve. As a result, the friction force of the ball on the bushing channel changes and the vertical component of the ball reaction from the action of the bushing changes, which leads to a change in the valve operating pressure and, as a result, to a decrease in the quality of the shut-off valve.

The objective of the proposed technical solution is to increase the accuracy of the response and the exclusion of the dependence of the accuracy of the response on the magnitude of the input pressure.

The essence of the claimed invention lies in the fact that the safety-locking gas device containing a housing, a cover, tuning springs and adjusting elements for setting the given parameters, the first rod is longitudinally elongated, which is installed in the first sleeve installed in the flange of the housing on which the shut-off a valve and a sleeve are fixed, a membrane installed between the body and the cover, a lever mechanism consisting of a second sleeve mounted in the housing perpendicular to the first rod and having a channel l in the lower part of the second rod, which presses the ball to the end of the sleeve, the levers fixed in the second rod have a third sleeve mounted coaxially with it in the body flange on the first sleeve, forming a gap between them for air outlet, connected to the outside hole made in the body flange in atmosphere; on the first rod, on its outer surface, a ring-shaped protrusion is made along the generatrix with the possibility of dividing the inner space of the first sleeve into two hermetically separated cavities - to an annular protrusion with the possibility of its connection with the atmosphere and the cavity after it - with the possibility of access to the gas pressure regulator, and the diameters the first rod and the annular protrusion are subject to the condition - the cross-sectional area of the rod is equal to the cross-sectional area of the annular protrusion; two holes are made inside the first rod: the first blind is extended along it, which is connected to the second through hole made through the rod perpendicular to its axis and located after the annular protrusion.

The technical result of the proposed solution is to increase the accuracy of operation of the product itself. The technical result is achieved due to the coincidence of the cross-sectional area of the first rod and the cross-sectional area of the annular protrusion. This leads to balancing the force acting on the first rod due to the inlet pressure, which leads to the fact that the force at the point of contact of the ball with the sleeve and the second sleeve remains constant when the input pressure in the gas pressure regulator changes. This leads to an increase in the accuracy of operation of the safety shut-off gas device.

The invention is illustrated using Figure 1-3, which presents:

Figure 1 is a drawing of a cross section of a product;

Figure 2 - drawing of a remote element;

Figure 3 is a drawing of a cross section of a first rod with an annular protrusion,

in which positions 1-19 show:

1 - housing

2 - cover

3, 4 - tuning springs,

5, 6 - adjusting elements,

7 - shut-off valve,

8 - the first stock,

9 - the first sleeve

10 - spring

11 - sleeve

12 - lever mechanism

13 - membrane

14 - the second sleeve,

15 - the second stock,

16 - levers

17 - ball

18 - the third sleeve

19 - an annular protrusion.

The inventive safety and locking gas device consists of a cast housing 1 having a connecting flange, a molded cover 2 with adjusting springs 3, 4 and adjusting elements 5, 6 for adjusting the set parameters, a shut-off valve 7 mounted on the first rod 8 longitudinally extended forms. The first rod 8 is installed in the flange of the housing 1 and in the first sleeve 12. On the first rod 8 a spring 10 is installed that moves the shut-off valve 7 and the sleeve 11. The lever mechanism 12 includes a second sleeve 14, mounted in the housing 1 and having a channel in the lower part, and a second rod 15 installed therein with levers 16 fixed thereon. The second sleeve 14 and the second rod 15 are perpendicular to the first rod 8. The second rod 15 presses the ball 17 through the channel in the second sleeve 14 to the first rod 8 and to the end of the sleeve 11.

In the flange of the housing 1, in which there is a hole A for connection with the atmosphere, and a third sleeve 18 is coaxially mounted on the first sleeve 9, which is made in such a way that there is a gap between the sleeve 9 and the sleeve 18 for the air to pass through the hole A in case 1 is connected to the atmosphere. The first rod 8 has on its outer surface a generatrix of an annular protrusion 19 (see Figure 3). This protrusion has a diameter such that the cross-sectional area of the first rod 8 and the cross-sectional area of the annular protrusion 19 are equal to each other, i.e.

S _pc = S _in. ,

where s _pc - cross-sectional area of the rod,

S _c. - the cross-sectional area of the protrusion of the rod.

Two holes are made inside the first rod 8: the first is a blind hole extended along the rod 8, which connects to the second through hole made through the first rod 8 perpendicular to its axis and located after the annular protrusion. An annular protrusion 19 divides the inner space of the first sleeve 12 into two hermetically separated cavities: a cavity B located before the annular protrusion 19 and a cavity B located after it. The cavity B is connected through the hole A in the housing 1 with the atmosphere, and through the cavity B there is a possibility of access to the gas pressure regulator.

Works safety-locking gas device as follows. When applying a controlled pressure into the cavity of the safety shut-off gas device corresponding to the adjusting pressure, the ball 17 abuts against the end of the sleeve 11, and the shut-off valve 7 is in a ready state. If the controlled pressure exceeds the adjustment pressure, the sum of the forces acting on the membrane 13 exceeds the force of the adjustment spring 3. The membrane 13 together with the lever mechanism 12, the second rod 15 moves up, the ball 17 enters the channel of the second sleeve 14 and disengages from the sleeve 11 The first rod 8 together with the shut-off valve 7 begins to move under the action of the spring 10, and the shut-off valve 7 blocks the gas inlet (intake) to the connected regulator. If the controlled pressure drops below the adjusting pressure, then in this case the membrane 13 together with the lever mechanism 12 moves down, and the second rod 15 with the levers 16 - up, the ball 17 enters the channel of the second sleeve 14 and disengages from the sleeve 11. The first the rod 8 together with the shut-off valve 7 under the action of the spring 10 begins to move, and the shut-off valve 7 blocks the gas inlet to the gas pressure regulator. Due to the annular protrusion 19, dividing the internal space of the first sleeve 9 into two cavities: one is made with the possibility of connection with the atmosphere, and the other with the possibility of access to the gas regulator, a pressure differential is created. The force created by this pressure drop is directed towards the force due to the inlet pressure and the cross-sectional area of the first rod 8 on the one hand and the annular protrusion 19 on the other. These forces, equal in magnitude and opposite in direction, balance each other and do not depend on the magnitude of the inlet pressure to the regulator, which ensures an increase in the accuracy of the safety shut-off gas device as a whole.

Example.

The inventive safety-locking gas device is used in the implementation of experimental samples of products and is being tested at one of the gas equipment enterprises in Saratov - LLC Gazprommash Plant.

Claims (1)

Safety and locking gas device containing a housing, a cover, tuning springs and adjusting elements for adjusting the set parameters, a first longitudinally extended rod that is installed in the first sleeve installed in the housing flange, on which the shut-off valve is mounted and the sleeve is fixed, the membrane installed between the body and the cover, a lever mechanism consisting of a second sleeve fixed in the housing perpendicular to the first rod and having a channel in the lower part of the second rod pressing against the end face Threat ball, levers fixed in the second rod, characterized in that it has a third sleeve mounted in the housing flange on the first sleeve coaxially with it, forming a gap between them for air outlet, connected to the hole made out of the housing flange out into the atmosphere, the first rod on its outer surface along the generatrix is made an annular protrusion with the possibility of dividing the inner space of the first sleeve into two hermetically separated cavities - to an annular protrusion with the possibility of its connection with the atmosphere and the cavity after it - with the possibility of access to the gas pressure regulator, and the diameters of the first rod and the annular protrusion are subject to the condition: the cross-sectional area of the rod is equal to the cross-sectional area of the annular protrusion, two holes are made inside the first rod: the first is deaf, which is extended along it, which is connected to a second through hole made through the rod perpendicular to its axis and located after the annular protrusion.

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