阅读说明：本技术 一种管路法兰渗漏监测报警装置及其渗漏监测方法 (Pipeline flange leakage monitoring alarm device and leakage monitoring method thereof ) 是由 李东辉 李衬 夏欢 程小龙 吴世权 韩昕宸 赵梦林 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种管路法兰渗漏监测报警装置及其渗漏监测方法,包括套设于管路上法兰连接处的密封组件,所述密封组件的外侧面设置有机械触发组件,所述机械触发组件的触发端安装有声光报警组件；所述机械触发组件包括固定外壳(1),所述固定外壳(1)内设置有进行上下驱动的滑动块(2),所述滑动块(2)的上侧端延伸至密封组件内,所述滑动块(2)的下侧端设有触头(3),所述触头(3)的延伸端延伸至声光报警组件内；所述密封组件包括相互卡合的上密封罩(4)和下密封罩(5),所述固定外壳(1)固定于下密封罩(5)的外侧表面上。本发明具有成本低,后期便于拆卸维护和更换电器元件的优点。(The invention discloses a pipeline flange leakage monitoring and alarming device and a leakage monitoring method thereof, wherein the pipeline flange leakage monitoring and alarming device comprises a sealing component sleeved at the joint of a flange on a pipeline, a mechanical trigger component is arranged on the outer side surface of the sealing component, and an acousto-optic alarm component is arranged at the trigger end of the mechanical trigger component; the mechanical trigger assembly comprises a fixed shell (1), a sliding block (2) which is driven up and down is arranged in the fixed shell (1), the upper side end of the sliding block (2) extends into the sealing assembly, a contact (3) is arranged at the lower side end of the sliding block (2), and the extending end of the contact (3) extends into the acousto-optic alarm assembly; the sealing assembly comprises an upper sealing cover (4) and a lower sealing cover (5) which are clamped with each other, and the fixed shell (1) is fixed on the outer side surface of the lower sealing cover (5). The invention has the advantages of low cost and convenient later-period disassembly, maintenance and replacement of electrical elements.)

1. The utility model provides a pipeline flange leakage monitoring alarm device which characterized in that includes:

the sealing assembly is sleeved at the flange connection position on the pipeline, a mechanical trigger assembly is arranged on the outer side surface of the sealing assembly, and an acousto-optic alarm assembly is mounted at the trigger end of the mechanical trigger assembly; the mechanical trigger assembly comprises a fixed shell (1), a sliding block (2) driven up and down is arranged in the fixed shell (1), the upper side end of the sliding block (2) extends into the sealing assembly, a contact (3) is arranged at the lower side end of the sliding block (2), and the extending end of the contact (3) extends into the acousto-optic alarm assembly.

2. The pipeline flange leakage monitoring and alarming device of claim 1, wherein: the sealing assembly comprises an upper sealing cover (4) and a lower sealing cover (5) which are clamped with each other, and the fixed shell (1) is fixed on the outer side surface of the lower sealing cover (5).

3. The pipeline flange leakage monitoring and alarming device of claim 2, wherein: the arc of lower sealed cowling (5) has seted up the seepage hole on the surface, it is downthehole that sliding block (2) upside end extends to the seepage.

4. The pipeline flange leakage monitoring and alarming device of claim 1, wherein: a plurality of bearing springs (6) are installed in the fixed shell (1), and the upper side ends of the bearing springs (6) are abutted to the sliding blocks (2).

5. The pipeline flange leakage monitoring and alarming device of claim 4, wherein: the upper end of the contact (3) is rotatably connected into the sliding block (2), a through hole is formed in the lower side plate of the fixed shell (1), and the contact (3) penetrates through the through hole.

6. The pipeline flange leakage monitoring and alarming device of claim 5, wherein: form ladder tang (16) between contact (3) and sliding block (2) downside end, ladder tang (16) goes out the cover and is equipped with the sealing washer, ladder tang (16) are used for spacing to the gliding distance of contact (3).

7. The pipeline flange leakage monitoring and alarming device of claim 1, wherein: the sound and light alarm assembly comprises a circuit tray (7) arranged on the lower side of the fixed shell (1), a button battery (8), a buzzer (9), an alarm lamp (10) and a microswitch (11) are arranged in the circuit tray, and the button battery (8), the buzzer (9), the alarm lamp (10) and the microswitch (11) are electrically connected; the position of the microswitch (11) corresponds to the contact (3).

8. The pipeline flange leakage monitoring and alarming device of claim 2, wherein: the clamping parts of the upper sealing cover (4) and the lower sealing cover (5) are respectively provided with a first plane flange (41) and a second plane flange (51), and a plane sealing gasket is arranged between the first plane flange (41) and the second plane flange (51) and is fixed through a fixing piece.

9. The pipeline flange leakage monitoring and alarming device of claim 2, wherein: mounting hole (12) have been seted up at the center of going up sealed cowling (4) and lower sealed cowling (5), the pipeline runs through mounting hole (12), the internal diameter wall of mounting hole (12) inlays and is equipped with pipeline surface sealing washer (13).

10. The leakage monitoring method of the pipeline flange leakage monitoring alarm device of any one of claims 1 to 9, comprising the following steps:

firstly, the device is installed and fixed on a pipeline, a flange is coated through the device, when the monitored flange leaks, internal leaked media or pressure cannot leak again from a sealing environment formed by an upper sealing cover (4) and a lower sealing cover (5), and only can enter an inner cavity of a fixed shell (1) through a leakage hole in the lower sealing cover (5);

when the leaked medium or pressure is accumulated in the fixed shell (1) to be larger than the supporting elastic force provided by the bearing spring (6), the sliding block (2) starts to move downwards until the lower side end of the contact (3) touches the micro switch (11), then the circuit is switched on, and the buzzer (9) and the alarm lamp (10) are electrified to start to execute acousto-optic alarm;

thirdly, when the leaked media are heavy or the pressure is further accumulated, the sliding block (2) continues to move downwards until the stepped spigot (16) is close to the inner bottom surface of the fixed shell (1), and the sealing ring begins to be pressed to form a sealing surface, so that the leaked media or the pressure is prevented from escaping to the circuit tray (7) from the through hole, and the leakage protection effect is achieved;

and step four, after receiving the audible and visual alarm, a worker arrives at the leakage position to perform leakage treatment, only the circuit tray (7) needs to be unscrewed, then after confirming that the pipeline is at normal pressure and placing a leakage receiving container, the contact (3) can be unscrewed, the medium leaked from the gap can be emptied from the through hole smoothly, a medium pollution surface cannot be formed or enlarged, the treatment site is clean, further disassembly treatment is convenient, and the device is restored to an un-triggered state after the leakage treatment at the flange of the pipeline is completed.

Technical Field

The invention relates to the field of pipeline leakage detection devices, in particular to a pipeline flange leakage monitoring alarm device and a leakage monitoring method thereof.

Background

Involve arranging and using of oil, gas, water pipeline and flange in the production work, individual pipeline flange arranges concealably, because vibration, factor such as corruption and installation, flange exists the seepage, unfavorable phenomena such as injection, it is little that daily patrols and examines the difficult fluid leakage volume that the pipeline flange appears, the seepage time is long, deterioration trend and phenomenon such as a large amount of injections suddenly, lack an obvious seepage and report to the police and the device of seepage double protection, be unfavorable for the steady progress and the timely processing of safety in production.

Most flange leakage monitoring devices all adopt cavity parcel flange at present, and the mode that cavity inside arranged pressure sensor, temperature sensor and humidity transducer carries out leakage monitoring, and there is the sensor to survey unobvious, damage difficult maintenance change, sensor probably wrong report drawbacks such as alert, and the structure is complicated, with high costs, can't play the effect of leakage protection when carrying out the monitoring of directly perceived leakage and reporting to the police.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a pipeline flange leakage monitoring alarm device and a leakage monitoring method thereof, so that the defects are overcome.

The purpose of the invention is realized by the following technical scheme:

a pipeline flange leakage monitoring alarm device, comprising:

the sealing assembly is sleeved at the flange connection position on the pipeline, a mechanical trigger assembly is arranged on the outer side surface of the sealing assembly, and an acousto-optic alarm assembly is mounted at the trigger end of the mechanical trigger assembly; the mechanical trigger assembly comprises a fixed shell, a sliding block which is driven up and down is arranged in the fixed shell, the upper side end of the sliding block extends into the sealing assembly, a contact is arranged at the lower side end of the sliding block, and the extending end of the contact extends into the acousto-optic alarm assembly.

Further, the seal assembly comprises an upper seal cover and a lower seal cover which are clamped with each other, and the fixed shell is fixed on the outer side surface of the lower seal cover.

Furthermore, the arc surface of lower seal cover has seted up the seepage hole, the side end extends to in the seepage hole on the sliding block.

Furthermore, a plurality of bearing springs are installed in the fixed shell, and the upper side ends of the bearing springs are abutted to the sliding blocks.

Furthermore, the upper end of the contact is connected in the sliding block in a screwing manner, a through hole is formed in the lower side plate of the fixed shell, and the contact penetrates through the through hole.

Further, form the ladder tang between contact and the sliding block lower extreme, the ladder tang goes out the cover and is equipped with the sealing washer, the ladder tang is used for spacing the gliding distance of contact.

Furthermore, the sound and light alarm assembly comprises a circuit tray arranged on the lower side of the fixed shell, a button battery, a buzzer, an alarm lamp and a microswitch are arranged in the circuit tray, and the button battery, the buzzer, the alarm lamp and the microswitch are electrically connected; the position of the micro switch corresponds to the position of the contact.

Furthermore, the clamping position of the upper sealing cover and the lower sealing cover is respectively provided with a first plane flange and a second plane flange, and a plane sealing gasket is arranged between the first plane flange and the second plane flange and is fixed through a fixing piece.

Furthermore, the centers of the upper sealing cover and the lower sealing cover are provided with mounting holes, the pipeline penetrates through the mounting holes, and the inner diameter wall surface of each mounting hole is embedded with a pipeline surface sealing ring.

The leakage monitoring method based on the pipeline flange leakage monitoring alarm device comprises the following steps:

firstly, the device is installed and fixed on a pipeline, a flange is coated through the device, when the monitored flange leaks, internal leaked media or pressure cannot leak again from a sealing environment formed by an upper sealing cover and a lower sealing cover, and only can enter an inner cavity of a fixed shell through a leakage hole in the lower sealing cover;

when the leaked medium or pressure is accumulated in the fixed shell to be larger than the supporting elastic force provided by the bearing spring, the sliding block starts to move downwards until the lower side end of the contact touches the micro switch, then the circuit is switched on, and the buzzer and the alarm lamp are electrified to start to execute acousto-optic alarm;

thirdly, when the leaked medium is heavy or the pressure is further accumulated, the sliding block continues to move downwards until the stepped spigot is close to the inner bottom surface of the fixed shell, the sealing ring is compressed to form a sealing surface, and the leaked medium or the pressure is prevented from escaping to the circuit tray from the through hole, so that the leakage protection effect is achieved;

and step four, after receiving the audible and visual alarm, working personnel arrive at the leakage position to perform leakage treatment, only the circuit tray needs to be unscrewed, then after confirming that the pipeline is at normal pressure and placing a leakage receiving container, the contact can be unscrewed, leaked media from the gap can be smoothly emptied from the through hole, a medium pollution surface cannot be formed or enlarged, the treatment site is clean, further disassembly treatment is convenient, and the device is restored to an un-triggered state after the leakage treatment at the pipeline flange is completed.

The invention has the beneficial effects that:

1. the pipeline flange leakage monitoring and alarming device provided by the invention adopts a mechanical structure to trigger an audible and visual alarm as a local alarm mode, and the leakage monitoring is reliable and intuitive;

2. the device can monitor and alarm when the pipeline flange leaks, and simultaneously complete the actions of leaking stoppage and leakage prevention;

3. when the device is used for leakage treatment of the pipeline flange by a worker, the leakage flange can be guided to smoothly empty a leakage medium, the disassembly and the treatment are convenient, and the treatment site is effectively prevented from being polluted by the medium;

4. the device has low manufacturing cost, low element cost and convenient purchase, and has simple structure, firmness and durability;

5. the acousto-optic alarm component of the device is relatively independent, corresponding electrical components are convenient to replace, and internal electronic components are further conveniently expanded in the later stage.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a side view of the present invention with the audible and visual alarm assembly removed;

FIG. 3 is a side view of the present invention;

FIG. 4 is a schematic diagram of the internal structure of the audible and visual alarm assembly;

FIG. 5 is a cross-sectional view of the slider and contacts.

In the figure, 1-a fixed shell, 2-a sliding block, 3-a contact, 4-an upper sealing cover, 5-a lower sealing cover, 6-a bearing spring, 7-a circuit tray, 8-a button battery, 9-a buzzer, 10-an alarm lamp, 11-a microswitch, 41-a first plane flange, 51-a second plane flange, 12-a mounting hole, 13-a pipeline surface sealing ring, 14-a sliding column, 15-a disc and 16-a step spigot.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

In one embodiment, as shown in fig. 1 to 5, a pipeline flange leakage monitoring and alarming device includes a sealing assembly sleeved at a flange joint on a pipeline, a mechanical trigger assembly is disposed on an outer side surface of the sealing assembly, and an audible and visual alarm assembly is mounted at a trigger end of the mechanical trigger assembly; the mechanical trigger component comprises a fixed shell 1, a sliding block 2 which is driven up and down is arranged in the fixed shell 1, the upper side end of the sliding block 2 extends into the sealing component, a contact 3 is arranged at the lower side end of the sliding block 2, and the extending end of the contact 3 extends into the acousto-optic alarm component.

In this embodiment, the sliding block 2 is an integrated into one piece structure, the sliding block 2 includes a sliding column 14 and a disc 15 sleeved on the sliding column 14, an arc-shaped outer wall surface of the disc 15 is attached to an arc-shaped inner diameter wall surface of the fixed housing 1, and the contact 3 is disposed at a lower side end of the sliding column 14.

The embodiment is further configured as follows: the sealing assembly comprises an upper sealing cover 4 and a lower sealing cover 5 which are mutually clamped, and the fixed shell 1 is fixed on the outer side surface of the lower sealing cover 5.

In this embodiment, after the upper sealing cover 4 and the lower sealing cover 5 are clamped, a cylindrical structure is formed, a sealing cavity is formed inside the cylindrical structure, and the flange connection position of the pipeline is located in the sealing cavity; the fixed shell 1 is also of a hollow cylindrical structure, and the fixed shell 1 and the lower sealing cover 5 are of an integrally formed structure.

The embodiment is further configured as follows: the arc surface of lower sealed cowling 5 has seted up the seepage hole, 2 side ends on the sliding block extend to in the seepage hole.

In this embodiment, leak hole intercommunication sealed chamber and fixed shell 1's inner chamber, sliding block 2's traveller 14 upper end is located the leak hole, sliding block 2 is when initial position, and the upper end terminal surface of its traveller 14 can not enter into the sealed intracavity, and this the seepage medium of being convenient for carries out pressure drive to sliding block 2.

The embodiment is further configured as follows: a plurality of bearing springs 6 are installed in the fixed shell 1, and the upper side ends of the bearing springs 6 are abutted to the sliding blocks 2.

In this embodiment, carrier spring 6 specifically is four, and it is fixed in on the 1 inner chamber bottom plate of fixed shell, set up the last mounting groove unanimous with carrier spring 6 quantity on the downside of the disc 15 of sliding block 2, be fixed with the last mounting groove unanimous with carrier spring 6 quantity on the 1 inner chamber bottom plate of fixed shell, carrier spring 6 places in corresponding last mounting groove and lower mounting groove from top to bottom.

The embodiment is further configured as follows: the upper end of the contact 3 is rotatably connected in the sliding block 2, a through hole is formed in the lower side plate of the fixed shell 1, and the contact 3 penetrates through the through hole.

In this embodiment, an end face of a lower end of the sliding column 14 of the sliding block 2 is provided with a threaded hole extending upward, and a threaded structure is formed on an outer side surface of an upper end of the contact 3 and is adapted to the threaded hole; the contact 3 is of a cylindrical structure.

The embodiment is further configured as follows: form ladder tang 16 between contact 3 and the slider 2 downside end, ladder tang 16 goes out the cover and is equipped with the sealing washer, ladder tang 16 is used for spacing to contact 3's gliding distance.

In this embodiment, the diameters of the sliding posts 14 of the sliding block 2 are respectively larger than the diameters of the contacts 3 and the through holes, and the stepped spigot 16 is formed at the connection part of the sliding posts 14 and the contacts 3 after being screwed.

The embodiment is further configured as follows: the sound and light alarm assembly comprises a circuit tray 7 arranged on the lower side of the fixed shell 1, a button battery 8, a buzzer 9, an alarm lamp 10 and a microswitch 11 are arranged in the circuit tray, and the button battery 8, the buzzer 9, the alarm lamp 10 and the microswitch 11 are electrically connected; the position of said microswitch 11 corresponds to the contact 3.

In this embodiment, the upper end of the circuit tray 7 is provided with an annular protrusion extending upwards, the inner diameter wall surface of the annular protrusion is provided with an internal thread, the outer side arc surface of the lower end of the fixed shell 1 is provided with an external thread, and the internal thread is adapted to the external thread; when the contact 3 is at the initial position, a gap is formed between the lower side end of the contact 3 and the microswitch 11, and after the contact 3 moves to the set position, the lower side end of the contact 3 is in contact with the microswitch 11, so that the acousto-optic alarm component is triggered.

The embodiment is further configured as follows: the clamping part of the upper sealing cover 4 and the lower sealing cover 5 is respectively provided with a first plane flange 41 and a second plane flange 51, and a plane sealing gasket is arranged between the first plane flange 41 and the second plane flange 51 and is fixed through a fixing piece.

In this embodiment, the fixing member is composed of a bolt and a nut used in cooperation.

The embodiment is further configured as follows: the center of the upper sealing cover 4 and the center of the lower sealing cover 5 are provided with mounting holes 12, the pipeline penetrates through the mounting holes 12, and the inner diameter wall surface of the mounting holes 12 is embedded with a pipeline surface sealing ring 13. The pipeline surface sealing ring 13 is sleeved on the pipeline.

Through the arrangement of the plane sealing gasket and the pipeline surface sealing ring 13, the sealing effect of the sealing cavity formed by the upper sealing cover 4 and the lower sealing cover 5 is better.

The second embodiment discloses a pipeline flange leakage monitoring and alarming device which comprises a sealing assembly sleeved at the joint of flanges on a pipeline, wherein a mechanical trigger assembly is arranged on the outer side surface of the sealing assembly, and an acousto-optic alarm assembly is mounted at the trigger end of the mechanical trigger assembly; the mechanical trigger component comprises a fixed shell 1, a sliding block 2 which is driven up and down is arranged in the fixed shell 1, the upper side end of the sliding block 2 extends into the sealing component, a contact 3 is arranged at the lower side end of the sliding block 2, and the extending end of the contact 3 extends into the acousto-optic alarm component.

In this embodiment, the sliding block 2 is an integrally formed structure, the sliding block 2 includes a sliding column 14 and a disc 15 sleeved on the sliding column 14, an arc-shaped outer wall surface of the disc 15 is attached to an arc-shaped inner diameter wall surface of the fixed housing 1, and the contact 3 is disposed at a lower side end of the sliding column 14; the upper side of the disc 15 is an annular inclined plane, and the lower side of the disc 15 is a plane.

The embodiment is further configured as follows: the sealing assembly comprises an upper sealing cover 4 and a lower sealing cover 5 which are mutually clamped, and the fixed shell 1 is fixed on the outer side surface of the lower sealing cover 5.

In this embodiment, the upper sealing cover 4 is hinged to one side of the lower sealing cover 5, the upper sealing cover 4 is clamped to the lower sealing cover 5 to form a cylindrical structure, a sealing cavity is formed inside the cylindrical structure, and the flange joint of the pipeline is located in the sealing cavity; the outer surface of the lower side of the lower sealing cover 5 is fixedly provided with a fixing ring, and the fixing shell 1 is screwed in the fixing ring or fixed through a bolt.

The embodiment is further configured as follows: the arc surface of lower sealed cowling 5 has seted up the seepage hole, 2 side ends on the sliding block extend to in the seepage hole.

In this embodiment, leak hole intercommunication sealed chamber and fixed shell 1's inner chamber, sliding block 2's traveller 14 upper end is located the leak hole, sliding block 2 is when initial position, and the upper end terminal surface of its traveller 14 can not enter into the sealed intracavity, and this the seepage medium of being convenient for carries out pressure drive to sliding block 2.

The embodiment is further configured as follows: a plurality of bearing springs 6 are installed in the fixed shell 1, and the upper side ends of the bearing springs 6 are abutted to the sliding blocks 2.

In this embodiment, carrier spring 6 specifically is six, and it is fixed in on the 1 inner chamber bottom plate of fixed shell, set up the last erection column unanimous with carrier spring 6 quantity on the downside of the disc 15 of sliding block 2, be fixed with the last erection column unanimous with carrier spring 6 quantity on the 1 inner chamber bottom plate of fixed shell, carrier spring 6 cover is located between corresponding last erection column and the lower erection column from top to bottom.

The embodiment is further configured as follows: the upper end of the contact 3 is rotatably connected in the sliding block 2, a through hole is formed in the lower side plate of the fixed shell 1, and the contact 3 penetrates through the through hole.

In this embodiment, an end face of a lower end of the sliding column 14 of the sliding block 2 is provided with a threaded hole extending upward, and a threaded structure is formed on an outer side surface of an upper end of the contact 3 and is adapted to the threaded hole; contact 3 is the cylinder structure, and it is from top to bottom, and the diameter reduces gradually, contact 3 lower side end is the spherical head.

The embodiment is further configured as follows: form ladder tang 16 between contact 3 and the slider 2 downside end, ladder tang 16 goes out the cover and is equipped with the sealing washer, ladder tang 16 is used for spacing to contact 3's gliding distance.

In this embodiment, the diameters of the sliding posts 14 of the sliding block 2 are respectively larger than the diameters of the contacts 3 and the through holes, and the stepped spigot 16 is formed at the connection part of the sliding posts 14 and the contacts 3 after being screwed.

The embodiment is further configured as follows: the sound and light alarm assembly comprises a circuit tray 7 arranged on the lower side of the fixed shell 1, a button battery 8, a buzzer 9, an alarm lamp 10 and a microswitch 11 are arranged in the circuit tray, and the button battery 8, the buzzer 9, the alarm lamp 10 and the microswitch 11 are electrically connected; the position of said microswitch 11 corresponds to the contact 3.

In this embodiment, the upper end of the circuit tray 7 is provided with an annular protrusion extending upwards, the annular protrusion is provided with a plurality of countersunk holes, screws are arranged in the countersunk holes, and the extending ends of the screws are screwed on the fixed shell 1; when the contact 3 is at the initial position, a gap is formed between the lower side end of the contact 3 and the microswitch 11, and after the contact 3 moves to the set position, the lower side end of the contact 3 is in contact with the microswitch 11, so that the acousto-optic alarm component is triggered.

Still be provided with wireless transmission component and circuit action acquisition component in the circuit tray 7, wireless transmission component passes through the network and is connected with backstage server, and the staff is informed to the staff of being convenient for like this and arrive corresponding position.

The embodiment is further configured as follows: the clamping part of the upper sealing cover 4 and the lower sealing cover 5 is respectively provided with a first plane flange 41 and a second plane flange 51, and a plane sealing gasket is arranged between the first plane flange 41 and the second plane flange 51 and is fixed through a fixing piece.

In this embodiment, the fixing member is composed of a bolt and a nut used in cooperation.

The embodiment is further configured as follows: the center of the upper sealing cover 4 and the center of the lower sealing cover 5 are provided with mounting holes 12, the pipeline penetrates through the mounting holes 12, and the inner diameter wall surface of the mounting holes 12 is embedded with a pipeline surface sealing ring 13. The pipeline surface sealing ring 13 is sleeved on the pipeline.

Through the arrangement of the plane sealing gasket and the pipeline surface sealing ring 13, the sealing effect of the sealing cavity formed by the upper sealing cover 4 and the lower sealing cover 5 is better.

The leakage monitoring method based on the pipeline flange leakage monitoring alarm device comprises the following steps:

firstly, the device is installed and fixed on a pipeline, a flange is coated through the device, when the monitored flange leaks, internal leaked media or pressure cannot leak again from a sealing environment formed by an upper sealing cover 4 and a lower sealing cover 5, and only can enter an inner cavity of a fixed shell 1 through a leakage hole in the lower sealing cover 5;

when the leaked medium or pressure is accumulated in the fixed shell 1 to be larger than the supporting elastic force provided by the bearing spring 6, the sliding block 2 starts to move downwards until the lower side end of the contact 3 touches the micro switch 11, then the circuit is switched on, and the buzzer 9 and the alarm lamp 10 are powered on to start audible and visual alarm;

thirdly, when the leaked medium is heavy or the pressure is further accumulated, the sliding block 2 continues to move downwards until the stepped spigot 16 is close to the inner bottom surface of the fixed shell 1, the sealing ring is compressed to form a sealing surface, and the leaked medium or the pressure is prevented from escaping to the circuit tray 7 from the through hole, so that the leakage protection effect is achieved;

and step four, after receiving the audible and visual alarm, a worker arrives at the leakage position to perform leakage treatment, only the circuit tray 7 needs to be unscrewed, then after confirming that the pipeline is at normal pressure and placing a leakage receiving container, the contact 3 can be unscrewed, the leaked medium is smoothly discharged from the gap from the through hole, a medium pollution surface cannot be formed or enlarged, the treatment site is clean, further disassembly treatment is convenient, and the device is restored to the non-triggered state after the leakage treatment at the pipeline flange is completed.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.