Hydrogen leakage alarm device

Abstract

The invention relates to the technical field of chemical leakage alarm, in particular to a hydrogen leakage alarm device which comprises chemical container bodies, communication pipelines fixed between the two chemical container bodies, a control cabinet body arranged between the two communication pipelines, and a sealing detection mechanism arranged on the outer surfaces of the communication pipelines in a sleeving mode. After the catalytic combustion type sensor detects that the hydrogen content exceeds a set value, the position of a leakage point can be determined according to detection data of the sensor, maintenance personnel can conveniently and rapidly arrive at the site for repairing, and therefore the leakage amount of hydrogen is reduced to the maximum extent; the hydrogen can only flow through a specific channel, the hydrogen in the sealing shell is pumped into the storage tank body in cooperation with the air pump, the storage tank body can collect the overflowed hydrogen in cooperation with the sealing detection mechanism and the air pumping mechanism, hydrogen loss is further reduced, and accidents caused by the fact that a large amount of hydrogen overflows into the environment are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical leakage alarm, and particularly relates to a hydrogen leakage alarm device. Background Art

[0002] Hydrogen is widely used in the chemical industry. Especially in the synthetic ammonia industry, as an important raw material, it reacts with nitrogen to synthesize ammonia under high temperature, high pressure and the action of a catalyst, and ammonia is a key intermediate in the production of chemical fertilizers. However, for long-term service chemical containers and transportation pipelines, due to the corrosion, erosion of hydrogen and the influence of the external environment, the material will gradually age and become brittle, with defects such as cracks and sand holes. At the same time, the seals of the containers, such as flange gaskets and valve sealing packings, may also be worn, aged or deformed after long-term use, resulting in a decline in the sealing performance, and then leading to hydrogen leakage from the seals.

[0003] Moreover, hydrogen has extremely strong flammability. Once it mixes with air to reach the explosion limit and encounters energy sources such as fire, static electricity, and high temperature, it is extremely easy to cause violent combustion and explosion. In addition, when hydrogen contacts some metal materials, it may also induce hydrogen embrittlement, resulting in a decrease in the toughness and strength of the metal, with cracks, embrittlement or even fracture, seriously threatening the safety of equipment and pipelines. Therefore, it is crucial to detect the hydrogen content in the environment, which can promptly detect hydrogen leakage and take corresponding measures in time to effectively avoid dangerous events such as combustion, explosion and suffocation caused by hydrogen leakage. For example, a hydrogen leakage alarm device disclosed in the publication number CN115823502B can realize the detection and alarm of the hydrogen content in the environment.

[0004] In actual scenarios, hydrogen leakage mostly occurs at the joints of containers and pipelines. Therefore, hydrogen leakage alarm devices are usually installed here for preventive detection. However, due to the corrosion, erosion of hydrogen and the influence of the external environment on the pipelines, there will be tiny cracks that are difficult to detect with the naked eye. At this time, it is necessary to use instruments to detect each pipeline everywhere one by one, which not only consumes a lot of time, but also during this process, hydrogen will continuously overflow to the outside, causing both hydrogen waste and explosion risks. Summary of the Invention

[0005] In view of the above-mentioned drawbacks of the prior art, the present invention provides a hydrogen leakage alarm device, which can effectively solve the problem that the prior art cannot effectively detect leakage points on pipelines.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0007] The present invention provides a hydrogen leakage alarm device, including: a chemical container main body, a communication pipeline is fixed between two said chemical container main bodies, a control cabinet main body is arranged between two said communication pipelines, and a seal detection mechanism is sleeved on the outer surface of the communication pipeline.

[0008] The sealing detection mechanism includes a sealing housing. A pneumatic component is fixed to the lower side of the outer surface of the sealing housing. Sealing airbags are symmetrically fixed inside the sealing housing. The sealing airbags are communicated with the two pneumatic components. A diversion pipe is fixedly penetrated through the upper side of the outer surface of the sealing housing. Driving components are symmetrically fixed inside the sealing housing;

[0009] The driving component includes a fixed pipe fixed to the inner wall of the sealing housing. A movable pipe is slidably connected inside the fixed pipe. A piston rod is hermetically slid inside the movable pipe. A rectangular frame is fixed to one end of the piston rod close to the communication pipe. A friction wheel is rotatably connected inside the rectangular frame. The fixed pipe is communicated with the pneumatic component.

[0010] Preferably, the friction wheel and the sealing airbag both fit on the outer surface of the communication pipe.

[0011] Preferably, it further includes an air extraction mechanism. The air extraction mechanism includes a sealing tank provided between the sealing housing and the control cabinet main body. An air extraction component is provided inside the sealing tank. A diversion component is fixed to the lower side of the outer surface of the sealing tank. A first connecting pipe is fixed to the upper side of the outer surface of the sealing tank. A first U-shaped pipe is fixed between the diversion component and the first connecting pipe. A second U-shaped pipe is fixed between the first U-shaped pipe and the sealing tank. A second connecting pipe is fixed to the lower end of the sealing tank.

[0012] Preferably, both the first connecting pipe and the second connecting pipe are communicated with the control cabinet main body by using corrugated pipes. The second U-shaped pipe is communicated with the corrugated pipe on one side of the second connecting pipe. Solenoid valves are provided inside both the first connecting pipe and the second connecting pipe.

[0013] Preferably, the air extraction component includes a sealing blade rotatably connected inside the sealing tank. An arc-shaped groove is penetrated through the upper end of the sealing blade. A plurality of arc-shaped holes are arrayed inside the arc-shaped groove. A plurality of plugging rings are hermetically slid inside the arc-shaped groove. The plurality of plugging rings are fixedly connected by a connecting rod. A sealing plate is fixed to the upper end of the plugging ring located at the uppermost side. The sealing plate is elastically connected to the inner wall of the arc-shaped groove. The arc-shaped groove is communicated with both the second U-shaped pipe and the second connecting pipe.

[0014] Preferably, the diversion component includes a sealing pipe fixed to the diversion pipe. A plurality of air leakage holes are circumferentially arrayed on the outer surface of the sealing pipe. A fixed column is fixed inside the sealing pipe. An electromagnetic block is fixed to one end of the fixed column close to the sealing tank. A plugging cover is slidably connected inside the sealing pipe. A permanent magnet block is fixed to the top wall of the plugging cover. The electromagnetic block and the permanent magnet block are magnetically repulsive. A conical block is fixed to one end of the plugging cover close to the sealing tank. An inner conical ring adapted to the conical block is fixed inside the sealing pipe.

[0015] Preferably, an opening groove is formed in the top wall of the plugging cover, and the ends of the electromagnetic block and the permanent magnet block close to each other are parallel.

[0016] Preferably, it further includes a control mechanism. The control mechanism includes a rectangular housing fixed to the sealing housing. A motor is fixed to one end of the rectangular housing. The output end of the motor is fixed with a reciprocating lead screw. Below the reciprocating lead screw, there is a cross bar rotatably connected in the rectangular housing. The reciprocating lead screw and the cross bar are connected by a belt drive. The reciprocating lead screw and the sealing blade are connected by a belt drive. A lead screw sleeve is sleeved on the outer surface of the reciprocating lead screw. An inner cross ring is sleeved on the outer surface of the cross bar. Below the inner cross ring, there is a conical sleeve. The inner cross ring and the conical sleeve are in mutual contact. The conical sleeve is connected to two friction wheels by a universal shaft through a belt drive.

[0017] The technical solution provided by the present invention has the following beneficial effects compared with the known prior art:

[0018] First, after the hydrogen content detected by the catalytic combustion sensor exceeds the set value, the air pressure assembly is activated to introduce air into the sealing airbag to make its volume increase, forming a sealed cavity. The air extraction mechanism extracts the hydrogen near the pipeline into the sensor. The leakage point position can be determined according to the detection data of the sensor, which is convenient for the maintenance personnel to quickly reach the site for repair, thereby minimizing the hydrogen leakage amount to the greatest extent. When hydrogen leaks, the relevant components are hermetically sealed, so that hydrogen can only flow through a specific channel. Then, with the cooperation of the air pump, the hydrogen in the sealing housing is extracted into the storage tank, so that the storage tank, in cooperation with the sealing detection mechanism and the air extraction mechanism, can collect the overflowing hydrogen, further reducing the hydrogen loss and preventing a large amount of hydrogen from overflowing into the environment and causing accidents.

[0019] Second, the control mechanism can adjust the rotation speed of the friction wheel according to the moving distance of the sealing housing, thereby slowing down the movement of the sealing housing, allowing sufficient time for the gas to flow to the catalytic combustion sensor in the control cabinet main body for detection; the sealing detection mechanism forms a sealed cavity through the design of the sealing airbag and the air pressure assembly, avoiding interference from external air during detection. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2Schematic diagram of the positions of some mechanisms of the present invention;

[0023] Figure 3 Schematic diagram of the internal structure of some mechanisms of the present invention;

[0024] Figure 4 Schematic diagram of the internal structure of the sealing detection mechanism of the present invention;

[0025] Figure 5 Schematic diagram of the internal structure of the drive assembly of the present invention;

[0026] Figure 6 Schematic diagram of the internal structure of the air extraction mechanism of the present invention;

[0027] Figure 7 Schematic diagram of the internal structure of the air extraction assembly of the present invention;

[0028] Figure 8 Schematic diagram of the internal structure of the flow guiding assembly of the present invention;

[0029] Figure 9 Schematic diagram of the internal structure of the control mechanism of the present invention.

[0030] Reference numerals: 1, main body of chemical container; 2, connecting pipeline; 3, main body of control cabinet; 4, sealing detection mechanism; 5, air extraction mechanism; 6, control mechanism; 41, sealing housing; 42, air pressure assembly; 43, sealing airbag; 44, diversion pipe; 45, drive assembly; 451, fixed pipe; 452, movable pipe; 453, piston rod; 454, rectangular frame; 455, friction wheel; 51, sealing tank; 52, air extraction assembly; 53, flow guiding assembly; 54, first connecting pipe; 55, first U-shaped pipe; 56, second U-shaped pipe; 57, second connecting pipe; 521, sealing leaf; 522, arc groove; 523, arc hole; 524, blocking ring; 525, sealing plate; 531, sealing pipe; 532, air leakage hole; 533, fixed column; 534, electromagnet; 535, permanent magnet; 536, blocking cover; 537, conical block; 538, inner conical ring; 61, rectangular housing; 62, motor; 63, reciprocating lead screw; 64, cross bar; 65, lead screw sleeve; 66, inner cross ring; 67, conical sleeve. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] The present invention will be further described below in conjunction with embodiments.

[0033] Embodiment: Refer to Figures 1 to 9 , a hydrogen leakage alarm device, comprising: a chemical container main body 1, a communication pipeline 2 is fixed between two chemical container main bodies 1, a control cabinet main body 3 is arranged between two communication pipelines 2, a sealing detection mechanism 4 is sleeved on the outer surface of the communication pipeline 2, and further comprises an air extraction mechanism 5 and a control mechanism 6. A PLC controller, a catalytic combustion type sensor and a storage tank are arranged in the control cabinet main body 3. The catalytic combustion type sensor can detect the hydrogen content in the environment, and then the hydrogen near the pipeline is extracted into the catalytic combustion type sensor through the sealing detection mechanism 4 and the air extraction mechanism 5 moving on the communication pipeline 2;

[0034] By detecting the hydrogen content through the catalytic combustion type sensor, the position where hydrogen leakage occurs on the communication pipeline 2 is located. This process is carried out when the staff detects the connection part of the transported hydrogen. And when it is detected that hydrogen leakage occurs on the communication pipeline 2, the storage tank in it can cooperate with the sealing detection mechanism 4 and the air extraction mechanism 5 to collect the overflowing hydrogen, which not only reduces the loss of hydrogen but also prevents a large amount of hydrogen from overflowing into the environment and causing accidents. An air pump is arranged in the storage tank to extract the hydrogen in the device;

[0035] It should be noted that there may be many pipelines between chemical containers, but only the sealing detection mechanism 4, the air extraction mechanism 5 and the control mechanism 6 in this device need to be arranged on the pipeline. The catalytic combustion type sensor can be divided into multiple cavities to detect the hydrogen content in pipelines at different positions, reducing unnecessary costs.

[0036] Further explanation, in order not to let the hydrogen content in the external air affect the device, the following settings are made, such as Figure 4 shown, the sealing detection mechanism 4 includes a sealing shell 41, a pressure component 42 is fixed on the lower side of the outer surface of the sealing shell 41, sealing air bags 43 are symmetrically fixed in the sealing shell 41, the sealing air bags 43 are communicated with the two pressure components 42, a diversion pipe 44 is fixedly penetrated through the upper side of the outer surface of the sealing shell 41, and drive components 45 are symmetrically fixed in the sealing shell 41.

[0037] Still further explanation, in order to make the sealed sealing shell 41 move along the surface of the communication pipeline 2, the following settings are made, such as Figure 5As shown, the driving assembly 45 includes a fixed pipe 451 fixed to the inner wall of the sealed housing 41. A movable pipe 452 is slidably connected inside the fixed pipe 451. A piston rod 453 is hermetically slidable inside the movable pipe 452. One end of the piston rod 453 close to the communication pipe 2 is fixed with a rectangular frame 454. A friction wheel 455 is rotatably connected inside the rectangular frame 454. The fixed pipe 451 is communicated with the air pressure assembly 42. Both the friction wheel 455 and the sealed airbag 43 are in contact with the outer surface of the communication pipe 2.

[0038] Specifically, when it is detected that the hydrogen content in the air exceeds the set value, the device will give an alarm and start the air pressure assembly 42 to introduce air into the sealed airbag 43, making the volume of the sealed airbag 43 increase to form a sealed cavity for the sealed housing 41. And the surface of the sealed airbag 43 has a coating, which can reduce the friction with the communication pipe 2 while ensuring the sealing performance of the sealed housing 41. The air pressure assembly 42 will also inject hydraulic oil into the fixed pipe 451. After the hydraulic oil enters the fixed pipe 451, it will first push the movable pipe 452 to move. During the movement of the movable pipe 452, it will drive the piston rod 453 and the friction wheel 455 to move simultaneously. When both the friction wheel 455 and the sealed airbag 43 are in contact with the surface of the communication pipe 2, the motor 62 can be started to make the device move along the outer surface of the communication pipe 2.

[0039] Further explanation, the following settings are made to handle hydrogen during and after the detection process, as Figure 6 As shown, the air extraction mechanism 5 includes a sealed tank 51 provided between the sealed housing 41 and the control cabinet main body 3. An air extraction assembly 52 is provided inside the sealed tank 51. A diversion assembly 53 is fixed to the lower side of the outer surface of the sealed tank 51. A first connecting pipe 54 is fixed to the upper side of the outer surface of the sealed tank 51. A first U-shaped pipe 55 is fixed between the diversion assembly 53 and the first connecting pipe 54. A second U-shaped pipe 56 is fixed between the first U-shaped pipe 55 and the sealed tank 51. A second connecting pipe 57 is fixed to the lower end of the sealed tank 51. Both the first connecting pipe 54 and the second connecting pipe 57 are connected to the control cabinet main body 3 through corrugated pipes. The second U-shaped pipe 56 is communicated with the corrugated pipe on one side of the second connecting pipe 57. Solenoid valves are provided in both the first connecting pipe 54 and the second connecting pipe 57.

[0040] Still further explanation, the following settings are made to extract the air inside the sealed housing 41 during the detection process, as Figure 7As shown, the air extraction assembly 52 includes a sealing blade 521 rotatably connected inside the sealed tank 51. An arc-shaped groove 522 is formed through the upper end of the sealing blade 521. A plurality of arc-shaped holes 523 are arrayed inside the arc-shaped groove 522. A plurality of plugging rings 524 are hermetically slidable inside the arc-shaped groove 522. The plurality of plugging rings 524 are fixedly connected by connecting rods. A sealing plate 525 is fixed to the upper end of the uppermost plugging ring 524. The sealing plate 525 is elastically connected to the inner wall of the arc-shaped groove 522. The arc-shaped groove 522 is connected to both the U-shaped tube two 56 and the connecting tube two 57.

[0041] For further explanation, in order to cooperate with the air extraction assembly 52 to collect the leaked hydrogen gas inside the sealed housing 41, the following settings are made. As Figure 8 shown, the diversion assembly 53 includes a sealing tube 531 fixed to the diversion tube 44. A plurality of air leakage holes 532 are arrayed circumferentially on the outer surface of the sealing tube 531. A fixed column 533 is fixed inside the sealing tube 531. An electromagnetic block 534 is fixed to one end of the fixed column 533 close to the sealed tank 51. A plugging cover 536 is slidably connected inside the sealing tube 531. An opening groove is formed on the top wall of the plugging cover 536. A permanent magnet block 535 is fixed to the top wall of the plugging cover 536. The electromagnetic block 534 and the permanent magnet block 535 repel each other magnetically. The ends of the electromagnetic block 534 and the permanent magnet block 535 close to each other are parallel. A conical block 537 is fixed to one end of the plugging cover 536 close to the sealed tank 51. An inner conical ring 538 adapted to the conical block 537 is fixed inside the sealing tube 531;

[0042] Specifically, when the catalytic combustion type sensor detects a value greater than the set value during the movement of the sealed housing 41, the PLC controller will turn off the motor 62 on that side to stop the movement of the sealed housing 41, and at the same time, energize the electromagnetic block 534 to make it magnetic. Since the electromagnetic block 534 and the permanent magnet block 535 repel each other magnetically, the electromagnetic block 534 will push the permanent magnet block 535 to move towards the side close to the inner conical ring 538. The plugging cover 536 and the conical block 537 will move along with the permanent magnet block 535. When the conical block 537 fits against the inner wall of the inner conical ring 538, the air leakage holes 532 and the inner conical ring 538 will be hermetically plugged, and at the same time, the U-shaped tube one 55 and the sealing tube 531 will be changed to an airtight communication state, and the solenoid valve inside the connecting tube one 54 on the same side will be closed. The hydrogen gas leaked from the leakage point will continuously flow into the sealed housing 41, and cooperate with the air pump to extract the hydrogen gas inside the sealed housing 41 into the storage tank, reducing the loss of hydrogen gas and preventing a large amount of hydrogen gas from overflowing into the environment and causing accidents.

[0043] For further explanation, in order to ensure the accuracy of the device during detection, the following settings are made. As Figure 9As shown in the figure, the control mechanism 6 includes a rectangular housing 61 fixed to the sealed housing 41. One end of the rectangular housing 61 is fixed with a motor 62, and the output end of the motor 62 is fixed with a reciprocating lead screw 63. Below the reciprocating lead screw 63, there is a cross bar 64 rotatably connected inside the rectangular housing 61. The reciprocating lead screw 63 and the cross bar 64 are connected by a belt drive. The reciprocating lead screw 63 is connected to the sealing blade 521 by a belt drive. A lead screw sleeve 65 is sleeved on the outer surface of the reciprocating lead screw 63, and an inner cross ring 66 is sleeved on the outer surface of the cross bar 64. Below the inner cross ring 66, there is a tapered sleeve 67. The inner cross ring 66 and the tapered sleeve 67 are in mutual contact. The tapered sleeve 67 is connected to two friction wheels 455 by a universal shaft and a belt drive. Since the friction wheels 455 will move inside the sealed housing 41, a tensioner needs to be set to ensure that the belt is always tight during belt drive;

[0044] Specifically, starting the motor 62 will drive the reciprocating lead screw 63 and the cross bar 64 to rotate simultaneously. The cross bar 64 will drive the inner cross ring 66 sleeved on its surface to rotate. Under the action of friction, the inner cross ring 66 will drive the tapered sleeve 67 in contact with its surface to rotate. The tapered sleeve 67 can drive the two friction wheels 455 attached to the surface of the connecting pipe 2 to rotate. Under the action of friction, the rotating friction wheels 455 will drive the sealed housing 41 to move along the surface of the connecting pipe 2.

[0045] The working principle of the present invention is as follows: The catalytic combustion type sensor in the control cabinet main body 3 is connected to the external environment. By using the heat generated by the combustion of hydrogen under the action of a catalyst, the temperature of the sensor element rises, resulting in a change in resistance. The hydrogen concentration is detected by measuring the resistance change (usually a platinum wire coil coated with a catalyst, and the catalyst is generally a precious metal such as platinum or palladium. When hydrogen comes into contact with the catalyst, a catalytic combustion reaction will occur on its surface). When the detected hydrogen content in the air exceeds the set value, the device will give an alarm and start the air pressure component 42 to introduce air into the sealed airbag 43, making the volume of the sealed airbag 43 increase to form a sealed cavity for the sealed housing 41. And the surface of the sealed airbag 43 has a coating, which can reduce the friction with the connecting pipe 2 while ensuring the sealing performance of the sealed housing 41. The air pressure component 42 will also inject hydraulic oil into the fixed pipe 451. After the hydraulic oil enters the fixed pipe 451, it will first push the movable pipe 452 to move. During the movement of the movable pipe 452, it will drive the piston rod 453 and the friction wheels 455 to move simultaneously. After the friction wheels 455 and the sealed airbag 43 both contact the surface of the connecting pipe 2, the motor 62 can be started to make the device move along the outer surface of the connecting pipe 2;

[0046] Detect and locate the leakage point on the connected pipeline 2, and the two friction wheels 455 will not cause excessive pressure on the pipeline during movement to deform it (when the friction wheels 455 contact the outer surface of the connected pipeline 2, even if the air pressure component 42 continues to inject hydraulic oil into the fixed pipe 451, the hydraulic oil will not push the movable pipe 452 to move when entering the fixed pipe 451, but will flow into the movable pipe 452 and accumulate. The hydraulic oil entering the movable pipe 452 will push it in the opposite direction through the inner wall of the movable pipe 452. That is to say, even if too much hydraulic oil is injected, the friction wheels 455 that have already contacted the outer surface of the connected pipeline 2 will not move, but will increase the cavity in the pipeline by pushing the movable pipe 452 in the reverse direction. Therefore, the friction wheels 455 will not squeeze the connected pipeline 2 between the containers);

[0047] Starting the motor 62 will drive the reciprocating lead screw 63 and the cross rod 64 to rotate simultaneously. The cross rod 64 will drive the inner cross ring 66 sleeved on its surface to rotate. When the inner cross ring 66 drives the conical sleeve 67 to rotate, the reciprocating lead screw 63 among them will drive the sealing blade 521 to rotate, and extract the air in the sealing housing 41 through the centrifugal force generated by the rotation. And because the two sealing air bags 43 will keep the sealing housing 41 in a sealed state. When the sealing housing 41 does not move to the leakage point, when the sealing blade 521 rotates, it will also extract the air in the outside world from the air leakage hole 532 to compensate for the air content in the sealing housing 41 (the purpose of the sealing housing 41 moving on the connected pipeline 2 is to locate the leakage point, so the set value of the hydrogen content in it is relatively high, so that the device will not be affected by the outside air entering the device through the air leakage hole 532). When the catalytic combustion type sensor detects a value greater than the set value during the movement of the sealing housing 41, the PLC controller will turn off the motor 62 on the side where the leakage point is detected to stop the movement of the sealing housing 41, and at the same time energize the electromagnet 534 to make it magnetic. Since the magnetism of the electromagnet 534 repels the permanent magnet 535, the electromagnet 534 will push the permanent magnet 535 to move towards the side close to the inner conical ring 538. The plugging cover 536 and the conical block 537 will move along with the permanent magnet 535. When the conical block 537 fits the inner wall of the inner conical ring 538, it will hermetically seal the air leakage hole 532 and the inner conical ring 538, and at the same time make the U-shaped pipe 1 55 and the sealing pipe 531 in an airtight communication state, and close the solenoid valve in the connecting pipe 1 54 on the same side. The hydrogen leaking from the leakage point will continuously flow into the sealing housing 41;

[0048] Under the action of friction, the inner cross ring 66 drives the conical sleeve 67 in contact with its surface to rotate. The conical sleeve 67 can drive the two friction wheels 455 in contact with the surface of the connecting pipe 2 to rotate. Under the action of friction, the rotating friction wheels 455 drive the sealing housing 41 to move along the surface of the connecting pipe 2. The gas on the pipe surface enters the control cabinet main body 3 through the first connecting pipe 54 for detection. Since the first connecting pipe 54 and the control cabinet main body 3 are connected by a corrugated pipe, that is, as the moving distance of the sealing housing 41 becomes larger, the gas needs a longer time to flow in the pipe. In order not to affect the detection effect of the device (during the movement of the sealing housing 41, it passes through the leakage point on the surface of the connecting pipe 2, but hydrogen needs a certain time to flow in the pipe. Even though the reaction speed of the catalytic combustion type sensor is very fast, it still needs a certain time, that is, the device will be delayed during movement and lead to incorrect positioning);

[0049] Since the reciprocating lead screw 63 and the cross rod 64 are belt-driven, when the inner cross ring 66 drives the conical sleeve 67 to rotate, the reciprocating lead screw 63 will also rotate, thereby driving the inner cross ring 66 to move to one side through the lead screw sleeve 65, so that the inner cross ring 66 gradually moves towards the side with a larger circumference of the conical sleeve 67. While not affecting the rotation of the reciprocating lead screw 63 and the cross rod 64, it will reduce the rotation speed of the inner cross ring 66 driving the conical sleeve 67. The best connection method between the inner cross ring 66 and the conical sleeve 67 is meshing. By means of gear meshing, the frictional loss during the movement of the inner cross ring 66 can be reduced, and at the same time, it can better drive the conical sleeve 67 to rotate. That is, when the moving distance of the sealing housing 41 in the pipe is larger, the length of the corrugated pipe will also be larger. By reducing the rotation speed of the friction wheels 455 to slow down the movement of the sealing housing 41, the gas can have sufficient time to flow into the control cabinet main body 3 to ensure the detection accuracy of the device;

[0050] At the same time, the hydrogen in the storage tank body will be extracted by the air pump, and the hydrogen in the sealed shell 41 will enter the U-shaped tube 1 55 through the sealing tube 531, and then flow from the U-shaped tube 1 55 to the sealed tank 51. Since the arc hole 523 is blocked by the blocking ring 524, the hydrogen will be stored in the sealing leaf 521 in the initial state. At the same time, the air pump will continuously extract the hydrogen in the bellows, and the air between the U-shaped tube 2 56 and the sealing plate 525 will be extracted through the bellows and the U-shaped tube 2 56, so that the sealing plate 525 is in a negative pressure state and moves toward the side close to the end of the U-shaped tube 2 56, sealing. The plate 525 will drive the sealing ring 524 to move at the same time, releasing the blockage of the arc hole 523 so that the arc groove 522 is connected to the sealing tank 51, and a large amount of gas will enter the arc groove 522. At this time, the sealing plate 525 is not driven to move by the force of negative pressure, but is kept stationary by the impact force generated when a large amount of hydrogen flows from the arc hole 523 into the arc groove 522. Then the air pump will continue to extract the hydrogen in the sealing shell 41 into the storage tank body. When the staff checks the connection points such as valves, the hydrogen will not overflow into the environment, and the leakage point on the connecting pipe 2 will be located at the same time.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydrogen leakage alarm device, characterized in that, Including: A chemical container main body (1), a connecting pipe (2) is fixed between two said chemical container main bodies (1), a control cabinet main body (3) is arranged between two said connecting pipes (2), and a seal detection mechanism (4) is sleeved on the outer surface of the connecting pipe (2); The seal detection mechanism (4) includes a seal housing (41), a pneumatic component (42) is fixed on the lower side of the outer surface of the seal housing (41), seal air bags (43) are symmetrically fixed in the seal housing (41), the seal air bags (43) are communicated with two pneumatic components (42), a diversion pipe (44) is fixedly penetrated through the upper side of the outer surface of the seal housing (41), and drive components (45) are symmetrically fixed in the seal housing (41); The drive component (45) includes a fixed pipe (451) fixed on the inner wall of the seal housing (41), a movable pipe (452) is slidably connected in the fixed pipe (451), a piston rod (453) is airtightly slid in the movable pipe (452), a rectangular frame (454) is fixed at one end of the piston rod (453) close to the connecting pipe (2), a friction wheel (455) is rotatably connected in the rectangular frame (454), and the fixed pipe (451) is communicated with the pneumatic component (42).

2. The hydrogen leakage alarm device according to claim 1, characterized in that, The friction wheel (455) and the seal air bag (43) are both attached to the outer surface of the connecting pipe (2).

3. The hydrogen leakage alarm device according to claim 1, wherein It further includes an air extraction mechanism (5), the air extraction mechanism (5) includes a seal tank (51) arranged between the seal housing (41) and the control cabinet main body (3), an air extraction component (52) is arranged in the seal tank (51), a diversion component (53) is fixed on the lower side of the outer surface of the seal tank (51), a first connecting pipe (54) is fixed on the upper side of the outer surface of the seal tank (51), a first U-shaped pipe (55) is fixed between the diversion component (53) and the first connecting pipe (54), a second U-shaped pipe (56) is fixed between the first U-shaped pipe (55) and the seal tank (51), and a second connecting pipe (57) is fixed at the lower end of the seal tank (51).

4. The hydrogen leakage alarm device according to claim 3, characterized in that, Both the first connecting pipe (54) and the second connecting pipe (57) are communicated with the control cabinet main body (3) by using corrugated pipes, the second U-shaped pipe (56) is communicated with the corrugated pipe on one side of the second connecting pipe (57), and electromagnetic valves are arranged in both the first connecting pipe (54) and the second connecting pipe (57).

5. The hydrogen leakage alarm device according to claim 3, characterized in that, The air extraction component (52) includes a seal blade (521) rotatably connected in the seal tank (51), an arc-shaped groove (522) is formed through the upper end of the seal blade (521), a plurality of arc-shaped holes (523) are arrayed in the interior of the arc-shaped groove (522), a plurality of plugging rings (524) are airtightly slid in the arc-shaped groove (522), the plurality of plugging rings (524) are fixedly connected by using connecting rods, a seal plate (525) is fixed at the upper end of the plugging ring (524) at the uppermost side, the seal plate (525) is elastically connected with the inner wall of the arc-shaped groove (522), and the arc-shaped groove (522) is communicated with both the second U-shaped pipe (56) and the second connecting pipe (57).

6. The hydrogen leakage alarm device according to claim 3, characterized in that, The diversion assembly (53) includes a sealing pipe (531) fixed to the diversion pipe (44). A plurality of air leakage holes (532) are circumferentially arrayed on the outer surface of the sealing pipe (531). A fixing column (533) is fixed inside the sealing pipe (531). An electromagnetic block (534) is fixed to one end of the fixing column (533) close to the sealing tank (51). A plugging cover (536) is slidably connected inside the sealing pipe (531). A permanent magnet block (535) is fixed to the top wall of the plugging cover (536). The electromagnetic block (534) and the permanent magnet block (535) repel each other magnetically. A conical block (537) is fixed to one end of the plugging cover (536) close to the sealing tank (51). An inner conical ring (538) adapted to the conical block (537) is fixed inside the sealing pipe (531).

7. The hydrogen leakage alarm device according to claim 6, characterized in that An opening groove is formed in the top wall of the plugging cover (536). The ends of the electromagnetic block (534) and the permanent magnet block (535) close to each other are parallel to each other.

8. An apparatus for hydrogen leakage alarm according to claim 5, characterized in that, It further includes a control mechanism (6). The control mechanism (6) includes a rectangular housing (61) fixed to the sealing housing (41). A motor (62) is fixed to one end of the rectangular housing (61). The output end of the motor (62) is fixed with a reciprocating lead screw (63). Below the reciprocating lead screw (63), there is a cross bar (64) rotatably connected inside the rectangular housing (61). The reciprocating lead screw (63) and the cross bar (64) are connected by a belt drive. The reciprocating lead screw (63) and the sealing blade (521) are connected by a belt drive. A lead screw sleeve (65) is sleeved on the outer surface of the reciprocating lead screw (63). An inner cross ring (66) is sleeved on the outer surface of the cross bar (64). Below the inner cross ring (66), there is a conical sleeve (67). The inner cross ring (66) and the conical sleeve (67) are in mutual contact. The conical sleeve (67) is connected to two friction wheels (455) by a belt drive using a universal shaft.

Images