CN201680017U

CN201680017U - Self-restoring explosion relief valve

Info

Publication number: CN201680017U
Application number: CN2010201809580U
Authority: CN
Inventors: 刘革; 瞿华; 杨永; 王世芹; 柴凤飞
Original assignee: Capital Engineering & Research Inc Ltd
Current assignee: Capital Engineering & Research Inc Ltd
Priority date: 2010-04-29
Filing date: 2010-04-29
Publication date: 2010-12-22
Anticipated expiration: 2020-04-29

Abstract

The utility model discloses a from compound explosion venting valve, include: the valve comprises a hollow valve body, wherein an annular connecting part extending outwards is arranged on the periphery of an upper port of the valve body, a valve cover covers the upper port of the valve body, a guide fixing frame is arranged on the upper part of the valve cover and is fixedly connected with the connecting part, the valve cover can be connected with the guide fixing frame in an axially sliding manner, more than one primary buffer device is uniformly distributed on the guide fixing frame, and the lower end of the primary buffer device is abutted against the valve cover; evenly laid locking device along circumference at the valve gap upper surface, locking device is including setting firmly the latch segment on the valve gap, the protruding outer fringe that stretches out the valve gap of one end of latch segment forms the link, and this link extends to the connecting portion top, and the link can pass through locking bolt, nut fixed connection with connecting portion. The utility model discloses can satisfy the gas tightness experiment requirement of system or equipment, operation and maintenance cost are low, can avoid taking place coal gas secondary explosion, have that the leakproofness is good, the advantage that fail safe nature is high.

Description

Self-restoring explosion relief valve

Technical Field

The utility model relates to a from compound explosion venting valve, especially a from compound explosion venting valve for gas recovery pipe network system, the use of specially adapted normal atmospheric temperature low pressure gas pipe network system.

Background

It is known that in gas piping systems, explosions due to equipment discharges are very likely to occur when the gas contains oxygen above the standard. In order to protect equipment and personal safety, explosion relief valves are usually installed in equipment and pipelines. When explosion happens, the explosion venting valve can be automatically opened to vent explosion pressure, so that equipment is protected and normal operation of the system is guaranteed. The existing explosion relief valve mainly comprises a diaphragm type explosion relief valve, a heavy hammer type explosion relief valve, a self-restoring type explosion relief valve and the like. Wherein:

1. the diaphragm type explosion venting valve consists of a valve body, a rupture disk, a clamp, a valve cover and other parts, and has the defects that the rupture disk needs to be replaced after each explosion venting, and the system needs to be stopped when the rupture disk is replaced, so that the time and labor are wasted, and the system operation cost is increased.

2. The weight type explosion venting valve mainly comprises a valve body, a valve cover, a weight, a plastic sealing ring and the like, wherein the valve cover is forced to be tightly pressed on the valve body by the gravity of the weight when the valve is used, so that the explosion venting valve is closed; during explosion, the explosion pressure pushes the valve cover open, so that the valve cover jumps, and the explosion pressure is released instantly; after the explosion venting valve is vented, the heavy hammer drives the valve cover to return under the action of gravity, so that the valve body is sealed, and the explosion venting valve can be repeatedly used. However, the valve cover receives a smaller restoring force, and the matching precision of the valve cover and the plastic sealing ring is lower, so that the sealing performance between the valve cover and the valve body is poor, and the outside air flows back to the gas pipeline through the gap between the valve cover and the valve body, so that the hidden trouble of secondary explosion of the gas exists.

3. The self-restoring explosion relief valve is generally applied to a low-pressure gas system and comprises a valve body and a guide vertical rod fixing frame arranged on the periphery of the valve body, wherein the guide vertical rod fixing frame is connected with the lower end of a guide vertical rod, the upper end of the guide vertical rod is connected with a spring fixing frame, and a plurality of spring devices are connected onto the spring fixing frame, a guide sleeve is sleeved on the guide vertical rod, a joint part extends towards the center direction of a valve cover from the guide sleeve, the spring devices are pressed on the joint part, and the joint part is in sealing connection with the valve cover. When the coal gas explodes, the valve cover jumps to push the spring device to open along the guide vertical rod, so that the explosion pressure is released, and the spring in the spring device is gradually compressed under the action of the explosion pressure; after the pressure is released, the valve cover is reset under the action of the spring force of the spring device, and the valve cover is matched with the plastic sealing ring on the valve body to play a sealing role. The preset take-off pressure of the self-restoring explosion relief valve is generally lower, before the self-restoring explosion relief valve leaves a factory and when a pipe network is subjected to an air tightness test in the initial production stage, the test pressure usually exceeds the take-off pressure of the explosion relief valve, so that the explosion relief valve takes off, the valve cover is opened, the take-off pressure of the explosion relief valve needs to be adjusted again, time and labor are wasted, and the operation and maintenance cost is increased. In addition, because the plastic sealing ring of the existing self-restoring explosion venting valve has certain errors in the installation process, the plastic sealing ring is not tightly matched with the valve cover, and the sealing performance of the explosion venting valve is reduced.

In a word, due to the structural limitation of the self-recovery explosion venting valve, the explosion venting valve is easy to jump when an air tightness test is carried out, the preset jump pressure of the explosion venting valve is damaged, the explosion venting valve cannot normally explode, the debugging is needed again, the time and the labor are wasted, and the operation and maintenance cost is increased. And the three explosion venting valves have poor sealing effect, and when the explosion venting valves are applied to a gas pipe network system, particularly a low-pressure gas pipe network system, secondary explosion of gas is easy to occur, the safety is low, the normal operation of equipment in the pipe network is influenced, and the service life of the equipment is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a from compound explosion venting valve, this from compound explosion venting valve can satisfy the gas tightness experiment requirement of system or equipment, and operation and maintenance cost are low and can strengthen explosion venting valve leakproofness, avoid taking place coal gas secondary explosion, improve explosion venting valve's fail safe nature.

In order to achieve the purpose, the utility model provides a self-restoring explosion relief valve, which comprises a hollow valve body, wherein an annular connecting part extending outwards is arranged at the periphery of an upper port of the valve body, a valve cover covers the upper port of the valve body, more than one primary buffer device is arranged above the valve cover, and the lower end of the primary buffer device is propped against the valve cover; the valve comprises a valve cover and a valve body, wherein a sealing structure is arranged between the valve cover and the valve body, more than two locking devices are uniformly distributed on the upper surface of the valve cover along the circumferential direction, each locking device comprises a locking block fixedly arranged on the valve cover, one end of each locking block protrudes out of the outer edge of the valve cover to form a connecting end, the connecting end extends to the upper part of the connecting part, and the connecting end and the connecting part can be fixedly connected through a locking bolt and a nut.

The self-restoring explosion venting valve comprises a valve cover, a valve body and a connecting part, wherein the connecting part of the valve body is provided with a plurality of connecting holes, the connecting holes correspond to the mounting through holes, and the mounting through holes are arranged on the same circumference with the center of the valve cover as the center of a circle.

The self-restoring explosion relief valve comprises a connecting part, wherein the connecting part is provided with a sealing groove, a plastic sealing ring is embedded in the sealing groove, the bottom surface of the sealing groove is provided with at least one sealing waterline, and the valve cover is in compression joint with the plastic sealing ring.

The self-restoring explosion relief valve is characterized in that at least one ring sealing edge is convexly arranged on the bottom surface of the valve cover downwards, and the sealing edge can be pressed on the plastic sealing ring.

The self-restoring explosion relief valve is characterized in that the sealing blades are arranged in parallel to form two rings, the sealing waterline is arranged in parallel to form two rings, and each ring of the sealing blades is correspondingly arranged above each ring of the sealing waterline.

The self-resetting explosion relief valve as described above, wherein the cross section of the sealing edge is in an inverted triangle shape.

The self-restoring explosion relief valve is characterized in that the upper part of the valve cover is provided with a guide fixing frame fixedly connected with the connecting part, the valve cover can be connected with the guide fixing frame in an axially sliding manner, and the more than one primary buffer devices are uniformly distributed on the guide fixing frame.

The self-restoring explosion venting valve comprises a cross beam frame and at least two guide vertical rods, wherein the upper ends of the guide vertical rods are connected with the cross beam frame, the lower ends of the guide vertical rods are connected with a connecting part, guide sleeves capable of sliding up and down along the guide vertical rods are arranged on the guide vertical rods, a joint part extends towards the center direction of the valve cover from the guide sleeves, the joint part is fixedly connected with the upper surface of the valve cover, and the lower end of a primary buffer device abuts against the joint part.

The self-restoring explosion relief valve is characterized in that the cross beam frame is of a hollow structure, the bottom surface of the cross beam frame is provided with accommodating holes corresponding to the positions of the guide sleeves, and the inner diameters of the accommodating holes are larger than the outer diameters of the guide sleeves.

The self-restoring explosion relief valve comprises a cross beam frame, four primary buffer devices, a secondary buffer device and a valve cover, wherein the cross beam frame is in a cross shape, the four primary buffer devices are uniformly distributed on the cross beam frame, the center of the cross beam frame is provided with the secondary buffer device, and a certain distance is reserved between the lower end of the secondary buffer device and the valve cover.

Compared with the prior art, the utility model has the following characteristics and advantages:

1. the utility model discloses be equipped with dismantled and assembled locking device on the valve gap, when carrying out the gas tightness experiment and apply high-pressure gas in the gas pipe network system, can avoid letting out the valve gap of exploding the valve and destroyed the jump pressure of letting out the valve presetting by high-pressure gas jack-up, satisfy the gas tightness experiment requirement of gas pipe network system or equipment, reduced operation and maintenance cost. And, locking device exerts pressure to seal structure through the valve gap, has strengthened seal structure complex compactness, has improved sealed effect.

2. The utility model discloses set up the seal groove from compound explosion relief valve between the connecting portion of valve body up end department and valve gap the embedded plastic sealing washer that is equipped with of seal groove, sealed waterline has been seted up to the lower terminal surface of seal groove, and plastic sealing washer receives the effect of clamping force and produces in the seal groove and warp for the cooperation of plastic sealing washer and seal groove is inseparable, avoids producing the air reflux owing to the clearance between plastic sealing washer and the seal groove, thereby avoids taking place the coal gas secondary explosion. The utility model has the advantages of good sealing performance and high safety and reliability.

3. The utility model discloses the bottom surface of valve gap with plastic seal ring joint department is equipped with sealed sword, sealed sword with sealed waterline is along vertical counterpoint setting, and sealed sword acts on plastic seal ring for plastic seal ring is inseparabler with the cooperation of seal groove, has improved to let out the leakproofness of exploding the valve.

4. The utility model discloses still be equipped with multistage buffer, have multistage buffering's effect for the valve gap take-off process is steady reliable, and has prolonged the life who lets out the explosion valve, has reduced the cost of gas piping system operation and maintenance.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein,

fig. 1 is a schematic top view of the self-restoring explosion venting valve of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure taken along the line A-A of FIG. 1;

FIG. 3 is an enlarged view of section E of FIG. 2;

fig. 4 is a schematic structural view of the valve cover and the locking block of the present invention after being combined;

FIG. 5 is an enlarged view of the portion B of FIG. 2;

fig. 6 is a schematic sectional structure view of the valve body of the present invention;

FIG. 7 is an enlarged view of the portion C of FIG. 6;

fig. 8 is a schematic sectional structure view of a valve cover part of the present invention;

fig. 9 is an enlarged schematic view of a portion D in fig. 8.

In the figure: 1-a valve body; 2-a connecting part; 3-locking the bolt; 4-a locking block; 41-a connection end; 42-mounting a through hole; 5-guiding vertical rods; 6-a beam frame; 8-an annular reinforcing ring; 9-pre-tightening the pull rod; 10-plastic sealing ring; 11-valve cover; 12-a connection hole; 13-a connecting flange; 14-a guide fixing frame; 15-guide sleeve; 16-a seal groove; 17-sealing the waterline; 18-a sealing edge; 19-a joint face; 20-a nut; 21-a joint; 22-a containment hole; 23-upper port of valve body; 71-primary buffer means; 72-secondary buffer.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals.

Referring to fig. 1 to 7, fig. 1 is a schematic top view of a self-resetting explosion venting valve according to the present invention; FIG. 2 is a schematic view of the cross-sectional structure taken along the line A-A of FIG. 1; FIG. 3 is an enlarged view of section E of FIG. 2; fig. 4 is a schematic structural view of the valve cover and the locking block of the present invention after being combined; fig. 5, 6 and 7 are respectively an enlarged structural schematic diagram of a portion B in fig. 2, a sectional structural schematic diagram of the valve body, and an enlarged structural schematic diagram of a portion C in fig. 6.

As shown in the figure, the utility model discloses from compound explosion venting valve, include: the lower part of the valve body 1 is welded with a connecting flange 13 and is used for being connected with equipment or a pipeline of a gas recovery pipe network system; the periphery of the upper port 23 of the valve body 1 is provided with an annular connecting part 2 which extends outwards, and the upper port 23 of the valve body 1 is covered by the valve cover 11. The guide fixing frame 14 is arranged at the upper part of the valve cover 11 and is fixedly connected with the connecting part 2, and the valve cover 11 can be connected with the guide fixing frame 14 in an axial sliding manner. More than one primary buffer devices 71 are uniformly distributed on the guide fixing frame 14, and the lower ends of the primary buffer devices 71 can prop against the valve cover 11, so that the valve cover 11 is tightly pressed on the upper port 23 of the valve body 1. The pressing force of the first-stage buffer device 71 acting on the valve cover 11 is adjusted by manually adjusting the position of a screwed nut at the upper end of the first-stage buffer device 71, so that the effect of adjusting the jump pressure of the valve cover 11 is achieved. Since the primary buffer device 71 of the present invention employs a known buffer unit such as a spring buffer or a hydraulic buffer, the detailed structure and function thereof will not be described in detail. The upper surface of valve gap 11 evenly lays more than two locking device along circumference, locking device is including evenly laying the latch segment 4 on the valve gap 11, the protruding outer fringe of valve gap 11 that stretches out of one end of latch segment 4 forms link 41, and this link 41 extends to connecting portion 2 top, link 41 with connecting portion 2 passes through locking bolt 3, nut 20 fixed connection, thereby make valve gap 11 with valve body 1 locking is fixed.

Further, as shown in fig. 2, 3, 4, 6, and 7, at least one mounting through hole 42 is formed at the connecting end 41 of each locking block 4, and a plurality of connecting holes 12 corresponding to the mounting through holes 42 are formed at the connecting portion 2 of the valve body 1, so that the locking bolt 3 can be inserted into the mounting through hole 42 and the connecting hole 12, and is matched with the nut 20 to lock the valve cover and the valve body. The centers of the installation through holes 42 of the locking blocks 4 are located on the same circumference, and the circumference takes the center of the valve cover as the center of a circle, so that the pressing force exerted on the valve cover 11 by the locking device is uniformly distributed, the valve cover does not incline or tilt, and the sealing property between the valve cover and the valve body is ensured.

As shown in fig. 5, 6 and 7, a ring-shaped sealing groove 16 is formed in the connecting portion 2, a plastic sealing ring 10 is embedded in the sealing groove 16, at least one ring-shaped sealing waterline 17 is formed in the bottom surface of the sealing groove 16, and the valve cover 11 is pressed against the plastic sealing ring 10. The plastic sealing ring 10 deforms in the sealing groove 16 with the sealing waterline 17 under the effect of the pressing force of the valve cover 11, so that the plastic sealing ring 10 can be tightly combined with the sealing groove 16, the sealing performance between the plastic sealing ring and the sealing groove is improved, and the positioning of the plastic sealing ring is favorably ensured.

Please refer to fig. 8 and 9, which are a schematic sectional view of a valve cover portion of the present invention and an enlarged schematic structural view of a portion D in fig. 8, respectively, and refer to fig. 5 in combination. As shown in the figure, at least one ring of sealing blade 18 is convexly arranged on the bottom surface of the valve cover 11, under the action of the primary buffer device 71, the sealing blade 18 is pressed on the plastic sealing ring 10, the vertex angle of the sealing blade 18 forms a cutting edge of the sealing blade 18, and the cutting edge of the sealing blade 18 can be embedded in the plastic sealing ring 10 to form a tight sealing structure, so that the sealing performance of the explosion venting valve is improved. In this embodiment, the cross section of the sealing blade 18 is in an inverted triangle shape, so that the contact area between the cutting edge of the sealing blade 18 and the plastic seal ring 10 is reduced, the cutting edge of the sealing blade 18 is easily embedded into the plastic seal ring 10, and the sealing performance of the sealing blade 18 and the plastic seal ring 10 in cooperation is improved.

Furthermore, the sealing edge 18 can be provided with two rings in parallel, and through two seals, the valve cover 11 and the valve body 1 have high sealing performance, and on the other hand, if one ring of the sealing edge is damaged, the other ring of the sealing edge still can enable the valve cover 11 and the valve body 1 to have good sealing effect, so that the reliability of the explosion venting valve is improved. Correspondingly, the sealing waterline 17 can also be provided with two rings in parallel, which is beneficial to the deformation of the plastic sealing ring 10 and further ensures the sealing effect between the plastic sealing ring 10 and the sealing groove 16. However, the present invention is not limited thereto, and the number of the sealing water line 17 and the sealing blade 18 may be 3 rings or more, as long as the effect of improving the sealing effect can be achieved.

Furthermore, each ring of the sealing blade 18 is correspondingly arranged above each ring of the sealing waterline 17, that is, each ring of the sealing blade 18 and each corresponding ring of the sealing waterline 17 have the same radius, under the action of the sealing blade 18, the cutting edge of the sealing blade 18 is embedded into the upper part of the plastic sealing ring, and the lower part of the plastic sealing ring 10 is deformed and then is embedded and sealed with the sealing waterline 17 under the action of the corresponding cutting edge, so that the stress and the deformation of the plastic sealing ring 10 are more uniform, the deformation of the plastic sealing ring 10 is further increased, and the sealing effect of the explosion venting valve is improved.

As shown in fig. 8 and 9, in the present embodiment, a circle of the joint surface 19 is processed at the outer edge of the bottom surface of the valve cover 11, and the sealing blade 18 is disposed on the joint surface 19, since it is not necessary to finish the entire bottom surface of the valve cover 11, but only a part of the bottom surface of the valve cover 11, that is, a part of the valve cover 11 corresponding to the connection portion of the valve cover 11 and the valve body 1, is processed, the amount of processing is reduced, the processing cost is saved, and the production efficiency is improved. In addition, an annular reinforcing ring 8 is welded to the center of the upper surface of the valve cover 11, and the effect of reinforcing the strength of the valve cover is achieved.

As shown in fig. 1, 2 and 9, in the utility model discloses, direction mount 14 is including having set firmly the crossbeam frame 6 and two at least direction pole settings 5 of one-level buffer 71, direction pole setting 5 upper end with crossbeam frame 6 is connected, its lower extreme with connecting portion 2 is connected, one-level buffer 71 sets firmly on the crossbeam frame 6, be equipped with on the direction pole setting 5 and follow direction pole setting 5 gliding guide pin bushing 15 from top to bottom, guide pin bushing 15 orientation valve gap 11 central direction extends there is joint 21, joint 21 with valve gap 11 upper surface rigid coupling, the lower extreme top of one-level buffer 71 support in on the joint 21. When releasing and exploding the valve, valve gap 11 plays the jump and the in-process that the whereabouts resets, slides from top to bottom along direction pole setting 5 through guide pin bushing 15 and plays the guide effect to valve gap 11, makes the valve gap remove along axial (vertical direction promptly) all the time to avoid valve gap 11 to produce the skew, make valve gap 11 can the accuracy reset, guarantee the cooperation precision between valve gap 11 and the connecting portion 2 of valve body 1, thereby guaranteed to release the sealed effect of exploding the valve. In addition, the guide sleeve 15 is made of copper, so that the guide sleeve 15 is in sliding fit with the guide vertical rod 5.

Furthermore, the cross beam frame 6 is a hollow structure with a rectangular cross section, the bottom surface of the cross beam frame 6 is provided with a containing hole 22 corresponding to the position of the guide sleeve 15, the inner diameter of the containing hole 22 is larger than the outer diameter of the guide sleeve 15, so that the guide sleeve 15 can enter the containing hole 22 when moving upwards along the guide vertical rod 5, the maximum jump height of the valve cover 11 is increased under the condition that the length of the guide vertical rod 5 is not increased, the discharge amount of high-pressure gas is increased, the overall height of the explosion venting valve is reduced, and the space saving is facilitated.

As shown in fig. 1 and 2, as an optional embodiment of the present invention, the cross-beam frame 6 is in a cross shape, four primary buffer devices 71 are uniformly distributed on the cross-beam frame 6, and the lower end of the primary buffer devices 71 abuts against the valve cover 11 for setting the tripping pressure of the explosion venting valve; a second-stage damping device 72 is provided at the center of the cross-beam frame, and since the second-stage damping device 72 of the present invention employs a known damping unit such as a spring damper or a hydraulic damper, its specific structure and function will not be described in detail herein. A certain distance is reserved between the lower end of the secondary buffer device 72 and the valve cover 11, and after the valve cover 11 jumps, the secondary buffer device 72 plays a role in further slowing down the impact force of the valve cover. Preferably, the distance between the lower end of the secondary buffer device and the valve cover is 40-50 mm, so as to achieve the optimal buffer effect.

The utility model discloses a theory of operation is: the self-restoring explosion relief valve is debugged after the assembly of a manufacturer is finished, firstly, the valve cover is locked on the valve body by using the locking device, and the sealing blade is tightly pressed on the plastic sealing ring at the moment; and then keeping standing for a period of time, so that the part of the plastic sealing ring, which is contacted with the sealing blade, generates plastic deformation, and the sealing blade is matched with the plastic sealing ring more tightly. In addition, because the sealing ring is easy to generate errors during assembly, the flatness of the upper surface of the sealing ring is influenced, the valve cover is tightly pressed on the valve body through the locking device, the matching tightness of the sealing blade and the sealing ring is enhanced, the sealing ring is enabled to generate large plastic deformation, the uneven upper surface of the sealing ring is flattened, and the flatness errors of the contact part of the sealing ring and the sealing blade are greatly reduced. Secondly, a nut and a locking bolt of the locking device are removed, so that the valve cover can freely move up and down along the guide vertical rod along with the guide sleeve, the primary buffer device is adjusted, the preset valve cover tripping pressure is preset, and the locking bolt and the nut are installed on the locking block and the connecting part, so that the valve cover is locked on the valve body, and the debugging operation of the explosion venting valve before leaving a factory is completed.

When the gas pressure relief valve is used, the explosion relief valve is integrally installed in a gas pipe network system, before the system runs, an integral gas tightness pressure relief test needs to be carried out on the whole gas pipe network system, generally, the pressure of gas introduced in the gas tightness pressure relief test is higher than the tripping pressure of the explosion relief valve, and due to the fact that the locking device is installed on the valve cover, the valve cover of the explosion relief valve can be prevented from being jacked up by high-pressure gas to damage the tripping pressure preset by the explosion relief valve in the test, and therefore the preset tripping pressure of the explosion relief valve is guaranteed to be unchanged. And after the test is finished, the locking bolt and the nut of the locking device are removed, so that the explosion venting valve is in a normal working state. When explosion occurs in the gas pipe network, the pressure of high-pressure gas generated in the pipeline of the gas pipe network system is higher than the tripping pressure of the explosion venting valve, the valve cover overcomes the tripping pressure preset by the primary buffer device and is jacked up, the upper port of the valve body is opened, high-pressure gas is discharged, and normal explosion venting of the explosion venting valve in the gas pipe network system when explosion occurs is guaranteed. In the jumping process of the valve cover, the guide sleeve slides up and down along the guide vertical rod to play a role in guiding the valve cover, so that the valve cover always moves along the axial direction (namely the vertical direction), and the valve cover is prevented from deviating. When the valve cover rises to a certain height, the valve cover is jointed with the secondary buffer device, and the valve cover is under the combined action of the primary buffer device and the secondary buffer device, so that the jumping stability of the valve cover is improved, and the service life of the valve cover is prolonged. After explosion venting is finished, under the action of the two-stage buffer device, the valve cover returns to the original position through the guide function of the guide sleeve and the guide function of the guide vertical rod, and the sealing blade on the bottom surface of the valve cover is tightly pressed on the plastic sealing ring, so that the explosion venting valve recovers the sealing state, air backflow caused by a gap between the plastic sealing ring and the sealing groove is avoided, and secondary explosion of coal gas is avoided. The utility model discloses can satisfy the gas tightness experiment requirement of system or equipment, reduce the cost of gas pipe network system operation and maintenance and can strengthen letting out and explode the valve leakproofness, avoid taking place the coal gas secondary explosion, improve to let out the fail safe nature who explodes the valve.

In addition, in the process of the rising of the valve cover, when the pressure of high-pressure gas is high enough, the guide sleeve moves upwards along the guide vertical rod and enters the hollow cross beam frame through the containing hole formed in the lower bottom surface of the cross beam frame, so that the maximum rising height of the valve cover is increased under the condition that the length of the guide vertical rod is not increased, the discharge amount of the high-pressure gas is increased, the overall height of the explosion venting valve is reduced, and the space is saved.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.

Claims

1. A self-resetting explosion relief valve, characterized in that it comprises: the valve comprises a hollow valve body, wherein an annular connecting part extending outwards is arranged on the periphery of an upper port of the valve body, a valve cover covers the upper port of the valve body, more than one primary buffer device is arranged above the valve cover, and the lower end of the primary buffer device is abutted against the valve cover; the valve comprises a valve cover and a valve body, wherein a sealing structure is arranged between the valve cover and the valve body, more than two locking devices are uniformly distributed on the upper surface of the valve cover along the circumferential direction, each locking device comprises a locking block fixedly arranged on the valve cover, one end of each locking block protrudes out of the outer edge of the valve cover to form a connecting end, the connecting end extends to the upper part of the connecting part, and the connecting end and the connecting part can be fixedly connected through a locking bolt and a nut.

2. The self-restoring explosion relief valve according to claim 1, wherein the connecting end of each locking block is provided with at least one mounting through hole, the connecting portion of the valve body is provided with a plurality of connecting holes, each connecting hole corresponds to each mounting through hole, and each mounting through hole is arranged on the same circumference with the center of the valve cover as the center of circle.

3. The self-healing explosion relief valve according to claim 1, wherein the sealing structure includes a ring of sealing groove formed in the connecting portion, a plastic sealing ring is embedded in the sealing groove, at least one ring of sealing waterline is formed in the bottom surface of the sealing groove, and the valve cover is in press-contact with the plastic sealing ring.

4. The self-healing explosion relief valve according to claim 3, wherein at least one annular sealing edge is provided on the underside of said valve cover in a downwardly projecting manner, said sealing edge being capable of pressing against said plastic sealing ring.

5. The self-healing explosion relief valve according to claim 4, wherein said sealing blades are arranged in two rings in parallel, said sealing waterline is arranged in two rings in parallel, and each said sealing blade is correspondingly arranged above each said sealing waterline.

6. The self-healing explosion relief valve according to claim 4 or 5, wherein said sealing edge has an inverted triangular cross-section.

7. The self-healing explosion relief valve according to any one of claims 1 to 5, wherein a guide fixing frame fixedly connected with the connecting portion is arranged at an upper portion of the valve cover, the valve cover is connected with the guide fixing frame in an axially slidable manner, and the one or more primary buffer devices are uniformly distributed on the guide fixing frame.

8. The self-healing explosion relief valve according to claim 7, wherein the guiding fixing frame comprises a cross beam frame and at least two guiding vertical rods, the upper ends of the guiding vertical rods are connected with the cross beam frame, the lower ends of the guiding vertical rods are connected with the connecting portion, guide sleeves capable of sliding up and down along the guiding vertical rods are arranged on the guiding vertical rods, a joint portion extends towards the center direction of the valve cover from the guide sleeves, the joint portion is fixedly connected with the upper surface of the valve cover, and the lower ends of the primary buffer devices abut against the joint portion.

9. The self-restoring explosion relief valve according to claim 8, wherein the cross beam is a hollow structure, a containing hole is formed in the bottom surface of the cross beam corresponding to the position of the guide sleeve, and the inner diameter of the containing hole is larger than the outer diameter of the guide sleeve.

10. The self-restoring explosion relief valve according to claim 8, wherein said cross-beam is cross-shaped, four primary buffer devices are uniformly distributed on said cross-beam, a secondary buffer device is provided at the center of said cross-beam, and a certain distance is provided between the lower end of said secondary buffer device and said valve cover.