CN205639733U - Safety blow -off valve for gas pipeline - Google Patents

Abstract

The utility model discloses a safety blow -off valve for gas pipeline, including valve body, valve gap, diaphragm, load dish, stifle, spring, pressure adjusting screw, the valve body is bowl form component, and there is the air inlet in bead department for the flange on the lateral wall, and the inner chamber has the drum structure, and the drum wall is valve port, internal chamber of hole junction valve and export with diaphragm contact department, valve gap one end is the flange, and the other end is the screw hole, flexible diaphragm presss from both sides the dress between valve body and valve gap, the spiral -lock has the load dish of band -pass hole and guide vane on the diaphragm, the spring force can be adjusted by pressure adjusting screw on being used in the load dish, the stifle can prevent that the foreign matter from getting into. During the use, the air inlet connects by the protection pipeline, and the export communicates with each other with the atmosphere, exceed predeterminedly when diffusing pressure as line pressure, diffuse the valve and open, the pipeline pressure release, drop to when diffusing pressure as line pressure, diffuse the valve and close. The utility model discloses close reliable, diffuse fast, the precision is high, through the test, the speed of diffusing improves 70%, and the precision is superior to 3%.

Description

A kind of fuel gas pipeline Safety relief valve

Technical field

This utility model belongs to gas transmission and distribution technical field, is specifically related to a kind of fuel gas pipeline Safety relief valve.

Background technology

During the transmission & distribution of pipe gas, when the downstream no user of pressure regulator uses combustion gas, then pressure regulator Can be automatically switched off, making by the gas flow of pressure regulator is zero, and now, the downstream pipe of pressure regulator is in close Closed state；Under this sealing state, if the ambient temperature around downstream pipe occurs to raise or pressure regulation Device leaks between upstream and downstream, then the pressure of downstream pipe can constantly raise, so that on downstream pipe The safety of gas equipment be on the hazard, for this reason, it may be necessary to downstream pipe after pressure rises to certain value Combustion gas carries out automatic relief, to maintain the pressure of downstream pipe within safety range.

Summary of the invention

For above-mentioned situation, the purpose of this utility model is to provide a kind of simple in construction, with low cost, reaction Sensitive fuel gas pipeline Safety relief valve.

For reaching above-mentioned purpose, this utility model by the following technical solutions:

A kind of fuel gas pipeline Safety relief valve, it includes valve body, valve gap, diaphragm, force bearing disk, boring cover, bullet Spring, tension adjusting screw；Described valve body is circular bowl structure, is flange arrangement, at it at its bead There is a cylindrical structure bottom of inner chamber along axial line, and on cylindrical wall, the one end by body cavity is shaped with valve port knot Structure, is a through hole in cylinder, and its one end is valve opening, is connected with body cavity, the other end as outlet with The external world is connected；The sidewall of valve body is provided with air inlet；One end of described valve gap is disc-shaped structure, its Being the flange arrangement matched with valve body at bead, its other end is internal thread hole structure, disk and female thread Pore structure is on the same axis；Described diaphragm is flexible disc-shaped component, is installed in valve body and valve gap Flange between；Side spiral-lock relative with valve port on diaphragm has a circular force bearing disk, makes diaphragm position Between force bearing disk and valve port；Being connected firmly and seal between force bearing disk and diaphragm；In force bearing disk The heart applies a suitable active force to valve port direction just can cut off the runner between diaphragm and valve port, thus The inner chamber making valve body is in air-tight state；Having towards outlet plenum side on the center of described force bearing disk The cross over pipe of one projection, the through hole on cross over pipe can make mutual UNICOM between outlet plenum and back pressure cavity, at connection Siphunculus directional spreding radially outside has the one group of quantity guide vane no less than three；This group guide vane and valve opening Between cooperation be accurate and loosen, its effect is ensureing that motion of membrane is flexibly while, it is ensured that putting Remain at same position between valve port and diaphragm when scattered valve cuts out repeatedly to contact；Described pressure regulation spiral shell The external screw thread nailed on matches with the female thread on valve gap, is installed on valve gap, rotational pressure regulation screw It can be made to move up and down on valve gap；On tension adjusting screw, the side towards force bearing disk is provided with spring calmly Hole, position, spring is positioned and is arranged between tension adjusting screw and force bearing disk；Rotational pressure regulation screw is permissible The decrement of regulation spring, thus regulate the size of spring force；Install on screwed hole port outside valve gap There is a boring cover in case foreign body enters.

The operation principle of diffusion valve is: body cavity does not has fluid pressure when, is positioned at pressure regulation spiral shell The spring-force driven dual produced by spring between nail and force bearing disk, on force bearing disk, pushes valve port to diaphragm, Diaphragm is made to be close to valve port；When body cavity has certain fluid pressure when, this fluid pressure acts on diaphragm Upper produced fluid force, makes diaphragm have the trend departing from valve port；In spring force and fluid force Under common effect, between diaphragm and valve port, produce a sealing force；The spring force of diffusion valve is once set up, close The size of envelope power is dependent on the size of fluid force, i.e. depends on the fluid pressure of body cavity: valve body The fluid pressure of inner chamber is the biggest, and sealing force is the least, otherwise, the fluid pressure of body cavity is the least, sealing force The biggest；When the fluid pressure of body cavity is less, sealing force is close more than the minimum that can keep sealing valve port state During envelope power, diffusion valve is at closed mode；When the fluid pressure of body cavity is gradually increasing, fluid is made Firmly can become larger, sealing force will be gradually reduced, when sealing force is less than keeping sealing valve port state During minimum sealing force, diffusion valve is switched on；Along with the unlatching of diffusion valve, the fluid of body cavity just passes through Oral cavity is outwards discharged；During discharge, owing to the fluid velocity around the cross over pipe on force bearing disk produces Venturi effect so that back pressure cavity produce a negative pressure so that the runner between valve port and diaphragm is fast Speed increases, it is ensured that diffusion valve is quick on the draw；Along with fluid the most outwards discharges, the fluid pressure of body cavity Power is gradually reduced, and the flow of discharge gradually decreases, and the fluid velocity around cross over pipe reduces, bearing of back pressure cavity Pressure reduces, and the runner between valve port with diaphragm reduces rapidly until diaphragm contacts with valve port；When diaphragm and valve port Between sealing force when being gradually increased to keep more than the minimum sealing force of sealing valve port state, diffusion valve is just It is re-closing off；Guide vane by the guide effect of valve opening make diffusion valve when repeating to close valve port and diaphragm it Between contact condition stablize constant, it is to avoid the impact on closing of the valve port impression on diaphragm, it is ensured that close Reliability；Make diffusion valve start open fluid pressure value be exactly diffusion valve diffuse pressure；Regulation spring The size of power just can regulate the size diffusing force value.

Time actually used, air inlet connect by protection pipeline, outlet plenum connect specifically diffuse pipeline or Directly being connected with air, rotational pressure regulation screw, the pressure that diffuses making diffusion valve is to be protected pipeline Safety margins pressure；When being risen to more than safety margins pressure by the pressure in protection pipeline, diffusion valve is just Open, by protection pipeline in fluid just by the runner between valve port and diaphragm to specifically diffuse pipeline or Directly to airborne release, make to be protected the pressure in pipeline to decline, reach the purpose of safeguard protection；When being protected When pressure in pillar road drops to below safety margins pressure, diffusion valve is just automatically switched off.

This utility model provides the benefit that: simple in construction, processing, installation, maintenance convenience, most importantly It is quick on the draw, closes reliable, diffuse that speed is fast, it is high to diffuse precision；Through actually used test, diffuse speed Degree can improve 70%, diffuses precision and is better than ± 3%.

Accompanying drawing explanation

Fig. 1 is this utility model structural representation

In figure, 1-valve body, 2-valve gap, 3-diaphragm, 4-force bearing disk, 5-boring cover, 6-spring, 7-pressure is adjusted Joint screw.

Detailed description of the invention

In conjunction with Fig. 1, detailed description of the invention of the present utility model is described as follows:

A kind of fuel gas pipeline Safety relief valve, it includes valve body 1, valve gap 2, diaphragm 3, force bearing disk 4, vexed Lid 5, spring 6, tension adjusting screw 7；Described valve body 1 is circular bowl structure, is method at its bead Blue structure, within it there is a cylindrical structure bottom in chamber along axial line, by valve body 1 inner chamber on cylindrical wall One end is shaped with valve mouth structure, is a through hole in cylinder, and its one end is valve opening, and valve body 1 intracavity inter-connection, The other end is connected with the external world as outlet；One end of described valve gap 2 is disc-shaped structure, at its bead is The flange arrangement matched with valve body 1, its other end is internal thread hole structure, disk and internal thread hole structure On the same axis；Described diaphragm 3 is flexible disc-shaped component, is installed in valve body 1 and valve gap 2 Flange between；Side spiral-lock relative with valve port on diaphragm 3 has a circular force bearing disk 4, force bearing disk Being connected firmly and seal between 4 and diaphragm 3；Apply one to valve port direction at the center of force bearing disk 4 to fit When active force just can cut off the runner between diaphragm 3 and valve port, so that the inner chamber of valve body 1 is in close Closed state；The cross over pipe of a projection, UNICOM is being had towards outlet plenum side on the center of force bearing disk 4 Through hole on pipe can make mutual UNICOM between outlet plenum and back pressure cavity, at cross over pipe directional spreding radially outside There is the one group of quantity guide vane no less than three；Coordinating between this group guide vane and valve opening is accurate and loosen , its effect is to ensure that motion of membrane is simultaneously flexibly, it is ensured that valve port and film when diffusion valve is closed repeatedly Same position contact is remained between sheet；The described external screw thread on tension adjusting screw 7 and valve gap 2 On female thread match, be installed on valve gap 2, rotational pressure regulation screw 7 it can be made at valve gap 2 On move up and down；On tension adjusting screw 7, the side towards force bearing disk is provided with location hole of the spring, spring 6 It is positioned and is arranged between tension adjusting screw 7 and force bearing disk 4；Rotational pressure regulation screw 7 can regulate The decrement of spring 6, thus regulate the size of spring force T；Pacify on screwed hole port outside valve gap 2 Equipped with a boring cover 5 in case foreign body enters.

The operation principle of diffusion valve is: the when that the inner chamber at valve body 1 not having fluid pressure, is positioned at pressure and adjusts The spring force T produced by spring 6 between joint screw 7 and force bearing disk 4 acts on force bearing disk 4, Diaphragm 3 pushes valve port to, makes diaphragm 3 be close to valve port；When diffusion valve inner chamber has certain fluid pressure when, This fluid pressure acts on produced fluid force F on diaphragm, makes diaphragm 3 have the trend departing from valve port； Under the common effect of spring force T and fluid force F, between diaphragm 3 and valve port, produce a sealing force, Its size is T-F；The spring force T of diffusion valve once sets up, and the size of sealing force is dependent on fluid force The size of F, i.e. depends on the fluid pressure of valve body 1 inner chamber: the fluid pressure of valve body 1 inner chamber is the biggest, seals Power is the least, otherwise, the fluid pressure of valve body 1 inner chamber is the least, and sealing force is the biggest；Stream when valve body 1 inner chamber Body pressure is less, and when sealing force is more than the minimum sealing force that can keep sealing valve port state, diffusion valve is at Closed mode；When the fluid pressure of valve body 1 inner chamber is gradually increasing, fluid force F can become larger, Sealing force will be gradually reduced, and when sealing force is less than the minimum sealing force that can keep sealing valve port state, puts Scattered valve is switched on；Along with the unlatching of diffusion valve, the fluid of valve body 1 inner chamber is just outwards discharged by outlet plenum； During discharge, the Venturi effect produced due to the fluid velocity around the cross over pipe on force bearing disk 4, Back pressure cavity is made to produce a negative pressure, so that the runner between valve port and diaphragm increases rapidly, it is ensured that Diffusion valve is quick on the draw；Along with fluid the most outwards discharges, the fluid pressure of valve body 1 inner chamber is gradually reduced, The flow of discharge gradually decreases, and the fluid velocity around cross over pipe reduces, and the negative pressure of back pressure cavity reduces, valve port Reduce rapidly until diaphragm contacts with valve port with the runner between diaphragm；Sealing between diaphragm 3 and valve port When power is gradually increased to keep more than the minimum sealing force of sealing valve port state, diffusion valve is just re-closing off； Guide vane by the guide effect of valve opening make diffusion valve repeat close time valve port and diaphragm between contact shape State is stablized constant, it is to avoid the impact on closing of the valve port impression on diaphragm, it is ensured that the reliability of closedown； Make diffusion valve start open fluid pressure value be exactly diffusion valve diffuse pressure；The size of regulation spring force T Just can regulate the size diffusing force value.

Claims (4)

1. a fuel gas pipeline Safety relief valve, it includes valve body (1), valve gap (2), diaphragm (3), force bearing disk (4), boring cover (5), spring (6), tension adjusting screw (7)；It is characterized in that valve body (1) is for circular bowl structure, it it is flange arrangement at its bead, within it there is a cylindrical structure bottom in chamber along axial line, on cylindrical wall, the one end by valve body (1) inner chamber is shaped with valve mouth structure, it it is a through hole in cylinder, its one end and valve body (1) intracavity inter-connection, the other end is connected with the external world as outlet；The sidewall of valve body (1) is provided with air inlet；One end of valve gap (2) is disc-shaped structure, for the flange arrangement matched with valve body (1) at its bead, its other end is internal thread hole structure, and disk with internal thread hole structure on the same axis, the sidewall of internal thread hole is shaped with the spiracle of a ventilation；Diaphragm (3) is flexible disc-shaped component, is installed between the flange of valve body (1) and valve gap (2)；A circular force bearing disk (4) is had in the upper side spiral-lock relative with valve port of diaphragm (3)；One group quantity guide vane no less than three slice is radially being distributed towards outlet plenum side on force bearing disk (4).

Fuel gas pipeline Safety relief valve the most according to claim 1, it is characterized in that the external screw thread that tension adjusting screw (7) is matched by female thread thereon and on valve gap (2) is arranged on valve gap (2), turning adjusting screw (7) can make it move up and down on valve gap (2)；The center of tension adjusting screw (7) is being provided with a location hole of the spring towards the orientation of force bearing disk (4).

Fuel gas pipeline Safety relief valve the most according to claim 1, is characterized in that spring (6) passes through hole, the location location and installation on tension adjusting screw (7) between tension adjusting screw (7) and force bearing disk (4).

Fuel gas pipeline Safety relief valve the most according to claim 1, is characterized in that being provided with a boring cover (5) on the screwed hole port in valve gap (2) outside.