CN213874833U

CN213874833U - Safety valve tightness detection device

Info

Publication number: CN213874833U
Application number: CN202022812471.6U
Authority: CN
Inventors: 马柯; 肖超波; 周杨飞; 邹家华; 王炽浩; 郭红军; 陈钦典; 刘勇添; 沈华龙; 谢艺华
Original assignee: Guangzhou Special Pressure Equipment Inspection and Research Institute
Current assignee: Guangzhou Special Pressure Equipment Inspection and Research Institute
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-08-03
Anticipated expiration: 2030-11-27

Abstract

A safety valve tightness detection device comprises a sealing unit for sealing a discharge port of a safety valve, a detection unit and a connection unit connected between the sealing unit and the detection unit; the sealing unit comprises a cover plate and a buckle, wherein the cover plate is used for covering the discharge port of the safety valve; the surface of the cover plate is provided with a through hole which is used for being communicated with the discharge port of the safety valve; the buckle comprises a bent clamp and an ejector rod; the bent clamps are clamped on the two side plate surfaces of the cover plate, and the ejector rod is movably connected with the bent clamps and pushes against the plate surfaces of the cover plate. Compared with the prior art, the utility model discloses a relief valve leakproofness detection device increases the packing force between relief valve and the relief valve leakproofness detection device to improve the accuracy that detects.

Description

Safety valve tightness detection device

Technical Field

The utility model relates to a relief valve detection area especially relates to a relief valve leakproofness detection device.

Background

Safety valves are a special type of valve, generally in a normally closed state and connected to a pipe carrying a medium. When the medium pressure in the pipeline rises and the pressure value is larger than the set pressure of the safety valve, the safety valve is opened and partial medium is discharged to a medium collecting device outside the system to reduce the pressure value in the pipeline until the pressure value in the pipeline is reduced to be below the set pressure, so that the pressure value in the pipeline is maintained in a safety range, and the pipeline is prevented from bursting. The pipeline connected with the safety valve is generally used for conveying combustible or toxic media such as hydrogen, natural gas and the like, and potential safety hazards are brought if the combustible or toxic media are discharged to the outside in a non-directional manner, so that the sealing performance of the safety valve needs to be ensured to ensure that the media all flow into the medium collecting device.

For the inspection of the sealing performance of the safety valve, relevant regulations are made in safety valve safety technology supervision regulations TSG ZF001-2006, and the safety valve needs to be detected in sealing performance and can be put into use after being qualified. During detection, gas discharged from the outlet of the safety valve is collected and led into the water cup, and then the number of bubbles in the water cup per unit time is read to judge the tightness of the safety valve. However, when the method is used for detection, the medium discharged by the safety valve needs to be ensured to enter the water cup. That is to say, need to guarantee the leakproofness of relief valve export and medium collection device junction, guarantee that the packing force of relief valve export and medium collection device department is even and accord with certain intensity requirement, if the packing force is inhomogeneous or not enough, the medium probably spills over from the junction to influence the accuracy that detects. Also with some large safety valves, it is difficult to ensure that the media collection device coincides with the outlet axis due to the large outlet area of the safety valve, resulting in uneven or insufficient compression force. In addition, when the sealing performance of the safety valve is found to be problematic, the part with the medium leakage needs to be determined for repair, but the part with the medium leakage is difficult to accurately find by means of discharging the medium into the water cup.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model aims to provide an improve relief valve leakproofness detection device of sealed detection accuracy.

The utility model discloses a following technical scheme realizes:

a safety valve tightness detection device comprises a sealing unit for sealing a discharge port of a safety valve, a detection unit and a connection unit connected between the sealing unit and the detection unit; the sealing unit comprises a cover plate and a buckle, wherein the cover plate is used for covering the discharge port of the safety valve; the surface of the cover plate is provided with a through hole which is used for being communicated with the discharge port of the safety valve; the buckle comprises a bent clamp and an ejector rod; the bent clamps are clamped on the two side plate surfaces of the cover plate, and the ejector rod is movably connected with the bent clamps and pushes against the plate surfaces of the cover plate.

Compared with the prior art, the utility model discloses a relief valve leakproofness detection device compresses tightly the relief valve discharge port through the buckle with the apron on, increase packing force in order to improve the leakproofness between relief valve and the relief valve leakproofness detection device to make the medium all flow in detecting element through the through-hole is whole, improve the accuracy of sealed detection. Can compress tightly the apron through promoting the ejector pin, an operating personnel also can accomplish the locking between relief valve and the relief valve leakproofness detection device, improves the operability.

Furthermore, a support hole is formed in the plate surface of the cover plate; the supporting hole is a blind hole, the opening of the supporting hole faces the ejector rod, and the ejector rod is inserted into the supporting hole when the ejector rod abuts against the cover plate. After the ejector rod is inserted into the supporting hole, the pressing force towards the surface of the cover plate is provided, and the supporting force parallel to the surface of the cover plate is also provided for the cover plate, so that the cover plate is further stabilized to press the safety valve.

Further, the sealing unit further comprises a sealing ring; the cover plate is back to the surface of the ejector rod, and a groove for mounting the sealing ring is formed in the surface of the cover plate. The sealing ring can further improve the leakproofness, further improves the accuracy that detects.

Further, the number of the buckles is more than two; the ejector rods are uniformly distributed along the circumferential direction which takes the center of the cover plate as the circle center. The even distributed ejector pin is the packing force of even effect on the apron, further improves the leakproofness with the accuracy that improves the detection.

Furthermore, the cover plate is also provided with a mounting hole for connecting with a safety valve; the number of the mounting holes and the number of the supporting holes are more than two, the mounting holes and the supporting holes are projected along the direction perpendicular to the surface direction of the cover plate, and the mounting holes and the supporting holes are evenly and alternately distributed along the circumferential direction with the center of the cover plate as the center of a circle. A plurality of buckles can be installed in a plurality of supporting holes, a plurality of bolts are arranged in the installing holes and press the cover plate to the safety valve, and the pressing force of the ejector rod and the pressing force of the bolts alternately act on the cover plate, so that the cover plate is uniformly stressed and sufficient pressing force is provided.

Further, the axis of the ejector rod is perpendicular to the surface of the cover plate. When the ejector rod is vertically pressed to the cover plate surface, the effective pressing force is the largest.

Further, the bent clamp is in threaded connection with the ejector rod. The threaded connection is convenient for adjusting the pressing force of the ejector rod pressing the cover plate.

Further, the detection unit comprises a leakage collecting cup for containing liquid and a valve connected with the leakage collecting cup; the valve is connected with the through hole through the connecting unit and is positioned between the cover plate and the leakage collecting cup. The leak detection method in the safety valve safety technology supervision regulation is combined with the leakage collecting cup, so that the tightness between the safety valve and the pipeline is detected.

Further, the detection unit further comprises a decompression table; and the low-pressure end of the decompression meter is connected with the through hole through the connecting unit. The pressure reducing meter reduces the pressure of the medium introduced into the safety valve, realizes the detection of the sealing performance of each connecting part of the safety valve and realizes various detections of the sealing performance of the safety valve.

Further, the device also comprises an exhaust valve for discharging residual media; the exhaust valve is communicated with the sealing unit and the detection unit through the connecting unit respectively. The residual medium remained in the safety valve and the safety valve tightness detection device can be removed after the exhaust valve is detected, and safety is improved.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram of a safety valve according to the prior art;

fig. 2 is a schematic structural view of a safety valve tightness detection device connected to a safety valve according to the present invention;

FIG. 3 is a schematic structural view of the middle cover plate of the present invention;

fig. 4 is a schematic structural view of the middle buckle of the present invention.

Detailed Description

Referring to fig. 1, the prior art provides a safety valve 10, and a safety valve tightness detecting device 20 of the present invention is connected to the safety valve 10 and detects the tightness thereof. The safety valve 10 comprises an air inlet cavity 11 communicated with the pipeline 1, an air exhaust cavity 12 communicated with the outside, a valve core 13 positioned in the air exhaust cavity 12, a mounting seat 14 fixedly arranged on the air exhaust cavity 12 through a screw, and a spring 15 fixed on the mounting seat 14 and connected with the valve core 13. Wherein the air inlet chamber 11 is provided with an air inlet 111 at a side of the duct 1 and an air outlet 112 at a side of the air outlet chamber 12. The valve core 13 covers the air outlet 112 to separate the air inlet chamber 11 and the air outlet chamber 12. The exhaust chamber 12 is provided with an exhaust port 121 connected to the outside, and in this embodiment, the cross section of the exhaust port 121 is circular. The valve core 13 is provided with a guide rod 131 inserted on the side of the mounting seat 14 facing the air outlet 112. The spring 15 is sleeved on the guide rod 131 and located between the installation seat 14 and the valve element 13, and the side surface of the installation seat 14 facing the air outlet 112 props against the spring 15. When the medium pressure value in the pipeline 1 is smaller than the set pressure, the valve core 13 covers the air outlet 112 to separate the air inlet cavity 11 from the air exhaust cavity 12, and the medium in the pipeline 1 cannot enter the air exhaust cavity 12 and is discharged to the outside; when the medium pressure value of the pipeline 1 is greater than or equal to a set pressure value, the valve core 13 moves away from the air outlet 112, the guide rod 131 slides relative to the mounting seat 14 to guide, the spring 15 is compressed and generates elastic force towards the air outlet 112, the medium enters the exhaust cavity 12 from the air inlet cavity 11 and is discharged to the outside, the medium pressure in the pipeline 1 is reduced, and the valve core 13 covers the air outlet 112 again under the action of the elastic force until the medium pressure value is less than the set pressure value, and separates the pipeline 1 from the outside again. Further, since the guide rod 131 slides relative to the mounting seat 14, in order to prevent the leakage of the medium from the connection where the guide rod 131 is inserted into the mounting seat 14, the safety valve 10 further includes a bonnet 16 that is fixed to the outside of the mounting seat 14 and covers the connection where the guide rod 131 and the mounting seat 14 are connected. Further, in order to make the valve core 13 move better in the exhaust cavity 12, the safety valve 10 further includes a guide sleeve 17 disposed in the exhaust cavity 12, the guide sleeve 17 is located above the air outlet 112, and the valve core 13 moves along the inner wall of the guide sleeve 17. Further, in order to facilitate connection with the safety valve tightness detection device 20, the exhaust chamber 12 is further provided with a flange 122 fixedly disposed outside the exhaust port 121.

Referring to fig. 2, the safety valve tightness detecting device 20 of the present invention includes a sealing unit 21 disposed at the exhaust port 121 and connected to the flange 122, a detecting unit 22 for detecting the tightness of the safety valve 10, and a connecting unit 23 connected between the sealing unit 21 and the detecting unit 22. The sealing unit 21 covers the exhaust port 121 of the safety valve 10 to ensure that when the medium in the pipeline 1 is discharged outwards, the medium is discharged to a designated position in a directional manner without leaking from the connection part of the safety valve 10 and the safety valve tightness detection device 20, and the connection unit 23 discharges the medium to the detection unit 22 for detection.

The sealing unit 21 includes a cover 211 covering the air outlet 121, and a latch 212 for pressing the cover 211 toward the air outlet 121. Referring to fig. 3, in the present embodiment, the cover plate 211 is a circular plate, covers the exhaust opening 121, and is fixed to the flange 122 by bolts. The cover plate 211 is provided with a through hole 2111 located at the center of the circle and communicated with the exhaust cavity 12, a mounting hole 2112 located on the plate surface and having an axis perpendicular to the plate surface, and a support hole 2113, the through hole 2111 is connected with the connection unit 23, and the support hole 2113 is a blind hole with an opening facing to the side far away from the safety valve 10. Screw holes corresponding to the mounting holes 2212 are formed in the flange 122, and the cover plate 211 is fixed to the flange 122 by bolts disposed in the mounting holes 2212. Preferably, the distance from the center of the supporting hole 2113 to the center of the cover plate 211 is equal to the distance from the center of the mounting hole 2212 to the center of the cover plate 211, projected in a direction perpendicular to the plate surface of the cover plate 211; further, the number of the support holes 2113 and the mounting holes 2212 is two or more and are alternately distributed in the circumferential direction so as to be mounted to the safety valve 10 at different angles. In this embodiment, the number of the supporting holes 2113 and the number of the mounting holes 2212 are 8, and the supporting holes 2113 and the mounting holes 2212 are alternately and uniformly distributed at equal intervals in the circumferential direction. Referring to fig. 4, the buckle 212 includes a curved clip 2121 having a curved portion and a push rod 2122 screwed to the curved clip 2121, and the push rod 2122 moves in the curved portion of the curved clip 2121. The bent clip 2121 is clamped between the flange 122 and the outer side of the cover plate 211, that is, the bent clip 2121 is clamped on the two side plate surfaces of the cover plate 211, and the ejector rod 2122 pushes against the plate surface of the cover plate 211. When the ejector 2122 is rotated, the ejector 2122 moves away from or approaches the cover 211, so that the latch 212 is closed, and the cover 211 and the flange 122 are compressed by closing the latch 212 to prevent the medium from leaking between the cover 211 and the flange 122. Preferably, one end of the ejector 2122 facing the cover plate 211 is inserted into the supporting hole 2113 and abuts against the cover plate 211, so as to achieve compression between the cover plate 211 and the flange 122, and support the cover plate 211 in a direction parallel to the plate surface of the cover plate 211; further, the number of the buckles 212 is two or more, and the buckles project in a direction perpendicular to the plate surface of the cover plate 211, and the ejector rods 2122 are uniformly distributed in a circumferential direction around the center of the exhaust port 121; further, the buckle 212 further includes a rotating rod 2123 fixedly disposed at an end of the top rod 2122 away from the cover plate 211, an axis of the rotating rod 2123 is perpendicular to an axis of the top rod 2122, the rotating rod 2123 is pulled to drive the top rod 2122 to rotate, the rotating rod 2123 is facilitated through a lever principle, and a pressing force between the cover plate 211 and the flange 122 is increased. In this embodiment, the number of the two buckles 212 is two, and the two buckles are symmetrically distributed along the radial direction of the cover plate 211, the bent clip 2121 is U-shaped, the flange 122 and the cover plate 211 are arranged in the bent portion thereof, and the axis of the ejector rod 2122 is perpendicular to the plate surface of the cover plate 211. Further, in order to improve the sealing performance between the cover plate 211 and the flange 122, the sealing unit 21 further includes a sealing ring 213 disposed on the plate surface of the cover plate 211 facing the exhaust port 121, a groove 2114 corresponding to the sealing ring 213 in shape is disposed on the plate surface of the cover plate 211 facing the exhaust port 121, the sealing ring 213 is disposed in the groove 2114 and projects in the direction perpendicular to the plate surface of the cover plate 211, and the sealing ring 213 is disposed outside the exhaust port 121. In this embodiment, the sealing ring 213 is an O-ring, and is projected along a direction perpendicular to the plate surface of the cover plate 211, the groove 2114 is circular and has a center coinciding with the center of the exhaust port 121, and a distance from the groove 2114 to the center of the cover plate 211 is greater than an aperture of the exhaust port 121.

The test unit 22 includes a collection and leakage cup 221 for holding liquid, a valve 222 connected to the media collection member 221, and a pressure relief gauge 223 connected to a test media reservoir (not shown). The valve 222 is connected between the cover plate 211 and the leakage collecting cup 221 through the connecting unit 23, and the medium flowing out of the through hole 2111 flows to the valve 222 through the connecting unit 23 and then flows into the leakage collecting cup 221, so that bubbles are generated. The decompression meter 223 is connected between the cover plate 211 and the detection medium storage, the high-pressure end of the decompression meter 223 is connected with the detection medium storage, and the low-pressure end of the decompression meter 223 is connected with the through hole 2111 of the cover plate 211. During detection, the detection medium in the detection medium storage is depressurized by the depressurization meter 223, flows through the cover plate 211 and enters the safety valve 10 for detection.

The connection unit 23 includes a connection pipe 221 and a connector 222, wherein one end of the connection pipe 221 is connected to the through hole 2111 of the cover 211, and the other end is connected to the valve 222 and the pressure relief gauge 223 through the connector 222.

Further, in order to perform evacuation after the test, the safety valve tightness detection device 20 further includes an exhaust valve 24 connected to the joint 222, the exhaust valve 24 is connected to a tail gas collector (not shown), and after the test, media remaining in the safety valve tightness detection device 20 and the safety valve 10 are exhausted to the tail gas collector through the exhaust valve 24.

In this embodiment, the joint 222 is a cross joint having 4 openings, and the 4 openings of the joint 222 are respectively connected to the through hole 2111 of the cover plate 211, the valve 222, the pressure reducing gauge 223 and the exhaust valve 24 through the connection pipe 221; the valve 222 and the exhaust valve 24 are ball valves; the connection pipe 221 is a pressure-resistant hose.

Based on the above structure, the detection process is specifically described as follows:

the cover plate 211 is first closed to the exhaust port 121, and the cover plate 211 is pressed against the exhaust port 121 by the snap 212. The connecting pipe 221 is connected with the through hole 2111 of the cover plate 211, the valve 222, the pressure reducing meter 223 and the exhaust valve 24, and liquid such as clean water is injected into the leakage collecting cup 221. The force F on the cover 211 is as follows:

F＝nF_G-PS

wherein: n-the number of said clasps 212, generally 4 to 8;

F_Gthe clamping force of each catch 212 in newtons;

p-the pressure of the medium flowing out of the safety valve 1 acting on the cover 211, in pa;

s — the seal area, which can be calculated from the nominal diameter of the seal 213, in square meters.

The following tests were then performed:

tightness test between the safety valve 10 and the pipe 1:

the pressure in the pipe 1 is first regulated to 0.9 times the pressure set by the safety valve 10. The valve 222 is then opened and the exhaust valve 24 and the pressure relief gauge 223 are closed. And observing whether bubbles emerge from the leakage collecting cup 221, and recording the number of the bubbles overflowing within one minute after the bubble overflowing speed is kept stable. And (3) judging whether the sealing performance between the safety valve 10 and the pipeline 1 is qualified or not and whether the sealing performance of the valve core 13 covered on the air inlet cavity 11 meets the specified requirements or not when the safety valve 10 is in the critical state by combining the related regulations of the number of the bubbles overflowing within one minute in safety technical supervision regulations of the safety valve. If the safety valve is not qualified, the tolerance of the joint of the safety valve 10 and the pipeline 1 is adjusted.

The tightness of the joints of the parts in the safety valve 10 is detected:

the medium delivery of the pipeline 1 is closed, and the valve core 13 covers the air inlet cavity 11. The valve 222 and the exhaust valve 24 are then closed. Then, the decompression meter 223 is connected to the detection medium reservoir, the detection medium flows into the exhaust chamber 12 through the decompression meter 223, the connection unit 23 and the cover plate 211, and a foaming agent such as soapy water is applied to the joints of the parts of the safety valve 10, and whether bubbles are generated is observed to determine whether the sealing performance of the joints of the parts of the safety valve 10 is qualified. In this embodiment, the location of the application of the blowing agent includes the connection of the mounting seat 14 to the exhaust chamber 12 and the connection of the bonnet 16 to the mounting seat 14.

After the detection is completed, the valve 222 and the decompression gauge 223 are closed, the exhaust valve 24 is connected to the exhaust gas collector, the exhaust valve 24 is opened, and the medium remaining in the safety valve 10 and the safety valve tightness detection device 20 is discharged to the exhaust gas collector through the exhaust valve 24.

In addition, the structure of the safety valve 10 mentioned here is only an example for convenience of description, and the safety valve sealing performance detection device of the present invention can be connected with safety valves having other structures, and can also realize sealing performance detection of safety valves having other structures by tightly covering the cover plate 211 on the discharge ports of safety valves having other structures. And the detection can be realized by replacing cover plates 211 with different sizes and buckles 212 with different pressing forces according to the size of the discharge port of the safety valve and the set pressure.

Compared with the prior art, the utility model discloses a relief valve leakproofness detection device compresses tightly the relief valve discharge port through the buckle with the apron on, increase packing force in order to improve the leakproofness between relief valve and the relief valve leakproofness detection device to make the medium all flow in detecting element through the through-hole is whole, thereby improve the accuracy of sealed detection. Can compress tightly the apron through promoting the ejector pin, an operating personnel also can accomplish the locking between relief valve and the relief valve leakproofness detection device, improves the operability, and work efficiency is high. And further improve the leakproofness through setting up supporting hole, sealing washer etc. the packing force that is used in on the apron is sufficient and evenly distributed, therefore the testing result accuracy is high. In addition, the safety valve sealing device is also provided with a plurality of detection devices to realize different detection modes, realize the detection of different positions of the safety valve on the same detection device, accurately find the position where leakage occurs and provide a plurality of references for judging the sealing property of the safety valve. After the detection is finished, the residual medium can be discharged directionally, and the safety is high.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. The utility model provides a relief valve leakproofness detection device which characterized in that: the device comprises a sealing unit for sealing a discharge port of the safety valve, a detection unit and a connection unit connected between the sealing unit and the detection unit; the sealing unit comprises a cover plate and a buckle, wherein the cover plate is used for covering the discharge port of the safety valve; the surface of the cover plate is provided with a through hole which is used for being communicated with the discharge port of the safety valve; the buckle comprises a bent clamp and an ejector rod; the bent clamps are clamped on the two side plate surfaces of the cover plate, and the ejector rod is movably connected with the bent clamps and pushes against the plate surfaces of the cover plate.

2. The safety valve sealability detection apparatus of claim 1, wherein: a support hole is formed in the surface of the cover plate; the supporting hole is a blind hole, the opening of the supporting hole faces the ejector rod, and the ejector rod is inserted into the supporting hole when the ejector rod abuts against the cover plate.

3. The safety valve sealability detection apparatus of claim 2, wherein: the sealing unit further comprises a sealing ring; the cover plate is back to the surface of the ejector rod, and a groove for mounting the sealing ring is formed in the surface of the cover plate.

4. The safety valve sealability detection apparatus of claim 3, wherein: the number of the buckles is more than two; the ejector rods are uniformly distributed along the circumferential direction which takes the center of the cover plate as the circle center.

5. The safety valve sealability detection apparatus of claim 4, wherein: the cover plate is also provided with a mounting hole for connecting the safety valve; the number of the mounting holes and the number of the supporting holes are more than two, the mounting holes and the supporting holes are projected along the direction perpendicular to the surface direction of the cover plate, and the mounting holes and the supporting holes are evenly and alternately distributed along the circumferential direction with the center of the cover plate as the center of a circle.

6. The safety valve sealability detection apparatus of claim 5, wherein: the axis of the ejector rod is perpendicular to the surface of the cover plate.

7. The safety valve sealability detection apparatus of claim 1, wherein: the bent clamp is in threaded connection with the ejector rod.

8. The safety valve sealability detection apparatus of claim 1, wherein: the detection unit comprises a leakage collecting cup for containing liquid and a valve connected with the leakage collecting cup; the valve is connected with the through hole through the connecting unit and is positioned between the cover plate and the leakage collecting cup.

9. The safety valve sealability detection apparatus of claim 8, wherein: the detection unit further comprises a decompression table; and the low-pressure end of the decompression meter is connected with the through hole through the connecting unit.

10. The safety valve sealability detection apparatus of claim 9, wherein: the device also comprises an exhaust valve for discharging residual medium; the exhaust valve is communicated with the sealing unit and the detection unit through the connecting unit respectively.