CN216079352U - Natural gas line pressure monitoring alarm device - Google Patents
Natural gas line pressure monitoring alarm device Download PDFInfo
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- CN216079352U CN216079352U CN202122480038.1U CN202122480038U CN216079352U CN 216079352 U CN216079352 U CN 216079352U CN 202122480038 U CN202122480038 U CN 202122480038U CN 216079352 U CN216079352 U CN 216079352U
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- driving rod
- natural gas
- air bag
- pressure monitoring
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Abstract
The utility model provides a pressure monitoring and alarming device for a natural gas pipeline, which belongs to the technical field of natural gas transportation and comprises a sleeve, an elastic air bag, a driving rod, an elastic part, a conflict switch and an alarming unit, wherein the sleeve is fixedly arranged on a natural gas transportation pipeline, the elastic air bag is arranged in the sleeve and is communicated with the transportation pipeline, and when the gas pressure in the transportation pipeline is overlarge, the elastic air bag can expand in the sleeve so as to push the driving rod to slide towards the outer side of the sleeve to conflict with the conflict switch, so that the conflict switch is closed to trigger the alarming unit to generate an alarming signal.
Description
Technical Field
The utility model belongs to the technical field of natural gas transportation, and particularly relates to a pressure monitoring and alarming device for a natural gas pipeline.
Background
In the process of conveying natural gas, due to external factors such as equipment aging and abrasion, the internal circulation of a natural gas conveying pipeline is reduced due to the fact that a filtering system is blocked and the like, and further the internal pressure of the natural gas conveying pipeline is increased, if the internal pressure cannot be found in time in the conveying process, the damage of the equipment is easy to accelerate after long-term use, and the natural gas leakage is easy to cause danger due to the fact that a part of sealing structures are easy to damage, the pressure value inside the conveying pipeline is checked by observing the value of a pressure gauge on the site conveying pipeline, and the problems that the internal pressure value of the conveying pipeline is untimely and manpower and material resources are consumed are found when the site overpressure of the conveying pipeline is easily caused by manual checking are solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a natural gas pipeline pressure monitoring and alarming device, and aims to solve the problems that in the prior art, when a natural gas conveying pipeline is in overpressure, the natural gas conveying pipeline cannot be found in time and manpower is consumed.
In order to achieve the purpose, the utility model adopts the technical scheme that: the utility model provides a natural gas line pressure monitoring alarm device, includes:
the sleeve is arranged on the conveying pipeline, and one end of the sleeve is connected with the conveying pipeline;
the elastic air bag is arranged inside the sleeve and is communicated with the conveying pipeline;
the driving rod is arranged on the sleeve and is arranged on the sleeve in a sliding manner along the length direction of the driving rod, and one end of the driving rod is abutted against the elastic air bag;
the elastic piece is arranged between the driving rod and the sleeve and used for driving the driving rod to move towards the direction close to the elastic air bag;
the collision switch is arranged on one side, away from the elastic air bag, of the driving rod along the sliding direction of the driving rod, and the driving rod can be collided on the collision switch and used for controlling the collision switch to be turned on or off;
the alarm unit, with conflict switch electric connection, conflict switch is used for controlling alarm unit's operating condition.
As another embodiment of this application, the sleeve with be provided with coupling assembling between the pipeline, coupling assembling includes:
the connecting pipe is fixedly arranged on the conveying pipeline and is communicated with the conveying pipeline;
the first flange is arranged at one end, far away from the conveying pipeline, of the connecting pipe;
the second flange is arranged on the sleeve, is close to one end of the conveying pipeline and is detachably connected with the first flange:
and the sealing ring is arranged at the air inlet of the elastic air bag, surrounds the outer side of the elastic air bag and is positioned between the first flange and the second flange.
As another embodiment of the present application, the connection assembly further includes:
the protruding ring is arranged on the outer side of the sealing ring in a surrounding mode, the protruding ring extends towards the two sides of the sealing ring along the axis direction of the sealing ring, and clamping grooves used for containing the protruding ring are formed in the first flange and the second flange.
As another embodiment of the present application, an axis of the driving rod is disposed in parallel with an axis of the sleeve.
As another embodiment of the present application, a top plate is disposed inside the sleeve, and the top plate is disposed between the driving rod and the elastic airbag and slidably disposed inside the sleeve along an axial direction of the sleeve.
As another embodiment of the application, a groove for accommodating the elastic air bag is arranged on one side of the top plate close to the elastic air bag.
As another embodiment of this application, be provided with the limiting plate on the actuating lever, the limiting plate with actuating lever threaded connection, the elastic component is located the limiting plate with between the roof.
As another embodiment of this application, be provided with chucking spare on the actuating lever, chucking spare quantity is two, two chucking spare respectively with actuating lever threaded connection just is located respectively the both sides of limiting plate.
As another embodiment of the present application, the sleeve includes:
the cylinder is arranged on the conveying pipeline, and one end of the cylinder is communicated with the conveying pipeline;
the cover plate is arranged at the other end of the cylinder body and is in threaded connection with the cylinder body, and the driving rod is arranged on the cover plate in a sliding mode.
As another embodiment of this application, the roof is close to actuating lever one side be provided with be used for with actuating lever threaded connection's thread bush, the thread bush with roof fixed connection.
The natural gas pipeline pressure monitoring alarm device provided by the utility model has the beneficial effects that: compared with the prior art, the natural gas pipeline is provided with the sleeve, the sleeve is fixedly arranged on the natural gas pipeline, the elastic air bag is arranged in the sleeve, the elastic air bag is communicated and hermetically connected with the natural gas pipeline, the driving rod is arranged in the sleeve in a sliding manner, one end of the driving rod is abutted against the outer side of the elastic air bag, the outer side of the other end of the driving rod is provided with the abutting switch, the abutting switch is arranged on the outer side of the sleeve, the driving rod can be abutted against the abutting switch to enable the abutting switch to be in a closed state, and the abutting switch is electrically connected with the alarm unit and used for controlling the working state of the alarm unit. Thereby make conflict switch reach the closed condition and trigger alarm unit and send alarm signal, can in time remind the staff to overhaul on-the-spot pipeline, prevent that equipment damage natural gas from leaking and leading to taking place danger.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a natural gas pipeline pressure monitoring alarm device provided in an embodiment of the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
In the figure: 1. a delivery conduit; 11. a connecting pipe; 12. a first flange; 2. a sleeve; 21. a second flange; 22. a barrel; 23. a cover plate; 3. an elastic air bag; 31. a seal ring; 311. a raised ring; 4. a drive rod; 41. a top plate; 411. a groove; 42. a limiting plate; 43. a top rod; 44. a retainer; 45. a threaded sleeve; 5. an elastic member; 6. a touch switch; 7. and an alarm unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1 and fig. 2 together, the pressure monitoring and alarming device for a natural gas pipeline provided by the present invention will now be described. The natural gas pipeline pressure monitoring and alarming device comprises a sleeve 2, an elastic air bag 3, a driving rod 4, an elastic piece 5, a collision switch 6 and an alarming unit 7. The sleeve 2 is arranged on the conveying pipeline 1, and one end of the sleeve 2 is connected with the conveying pipeline 1; the elastic air bag 3 is arranged inside the sleeve 2, and the elastic air bag 3 is communicated with the conveying pipeline 1; the driving rod 4 is arranged on the sleeve 2 and is arranged on the sleeve 2 in a sliding mode along the length direction of the driving rod 4, and one end of the driving rod 4 abuts against the elastic air bag 3; the elastic piece 5 is arranged between the driving rod 4 and the sleeve 2 and is used for driving the driving rod 4 to move towards the direction close to the elastic air bag 3; the collision switch 6 is arranged on one side, away from the elastic airbag 3, of the driving rod 4 along the sliding direction of the driving rod 4, and the driving rod 4 can collide with the collision switch 6 to control the collision switch 6 to be turned on or off; alarm unit 7 and conflict switch 6 electric connection, conflict switch 6 is used for controlling alarm unit 7's operating condition.
Compared with the prior art, the natural gas pipeline pressure monitoring and alarming device provided by the embodiment has the advantages that the sleeve 2 is arranged on the natural gas pipeline 1, the sleeve 2 is fixedly arranged on the natural gas pipeline 1, the elastic air bag 3 is arranged in the sleeve 2, the elastic air bag 3 is communicated and hermetically connected with the natural gas pipeline 1, the driving rod 4 is slidably arranged in the sleeve 2, one end of the driving rod 4 is abutted against the outer side of the elastic air bag 3, the outer side of the other end of the driving rod 4 is provided with the abutting switch 6, the abutting switch 6 is arranged on the outer side of the sleeve 2, the driving rod 4 can be abutted against the abutting switch 6 to enable the abutting switch 6 to be in a closed state, the abutting switch 6 is electrically connected with the alarming unit 7 and used for controlling the working state of the alarming unit 7, when the device is used, the internal pressure of the natural gas pipeline 1 is increased to enable the elastic air bag 3 to be expanded in the sleeve 2, elastic airbag 3 can drive actuating lever 4 and slide to the sleeve 2 outside at the inflation in-process, makes the tip of actuating lever 4 contradict on conflict switch 6, thereby makes conflict switch 6 reach the closed condition and triggers alarm unit 7 and send alarm signal, can in time remind the staff to overhaul on-the-spot pipeline 1, prevents that equipment damage natural gas from leaking and leading to taking place danger.
In this embodiment, alarm unit 7 includes alarm lamp and bee calling organ and to the battery that alarm lamp and bee calling organ provided the power, and battery an electric cord is even with alarm lamp and bee calling organ electricity, and another utmost point electric cord is even with alarm lamp and bee calling organ electricity through conflict switch 6, and when conflict switch 6 closed, alarm lamp and bee calling organ intercommunication and send alarm signal, when conflict switch 6 was opened, alarm lamp and bee calling organ disconnection ended the warning.
In this embodiment, the driving rod 4 can be driven by the elastic member 5 to move away from one side of the collision switch 6, and when the pressure in the conveying pipeline 1 is reduced, the driving rod 4 can be driven by the elastic member 5 to separate from the collision switch 6, so that the alarm unit 7 is disconnected to finish the alarm.
Referring to fig. 1 and 2 together, a connection assembly is disposed between the sleeve 2 and the transmission pipeline 1, and the connection assembly includes a connection pipe 11, a first flange 12, a second flange 21, and a sealing ring 31. The connecting pipe 11 is fixedly arranged on the conveying pipeline 1 and is communicated with the conveying pipeline 1; the first flange 12 is arranged at one end of the connecting pipe 11 far away from the conveying pipeline 1; the second flange 21 is arranged at one end of the sleeve 2 close to the conveying pipeline 1 and is detachably connected with the first flange 12: the sealing ring 31 is arranged at the air inlet of the elastic air bag 3, is enclosed outside the elastic air bag 3 and is positioned between the first flange 12 and the second flange 21. Connecting pipe 11 sets up perpendicularly and through welding sealing connection with pipeline 1, be provided with first flange 12 at the other end of connecting pipe 11, be provided with second flange 21 on sleeve 2, first flange 12 passes through bolt fixed connection with second flange 21, be provided with sealing washer 31 in the inlet port department of elasticity gasbag 3, the external diameter of sealing washer 31 is greater than the external diameter of elasticity gasbag 3, through placing sealing washer 31 the terminal surface of first flange 12 and through the bolt tighten first flange 12 and second flange 21 can make elasticity gasbag 3 and connecting pipe 11 sealed intercommunication.
In this embodiment, the elastic bladder 3 and the sealing ring 31 are integrally formed. The sealing performance between the elastic bag 3 and the gasket 31 can be improved.
As a specific embodiment of the natural gas pipeline pressure monitoring and alarming device provided by the present invention, please refer to fig. 1 and fig. 2, the connection assembly further includes a protruding ring 311. The protruding ring 311 is enclosed outside the sealing ring 31 and extends to two sides of the sealing ring 31 along the axial direction of the sealing ring 31, and the first flange 12 and the second flange 21 are provided with clamping grooves for accommodating the protruding ring 311. The raised ring 311 is of unitary construction with both the sealing ring 31 and the resilient bladder 3. When the elastic airbag is used, the elastic airbag 3 can be positioned by placing the raised ring 311 into the clamping groove, and when the first flange 12 is attached and tightened with the second flange 21, the raised ring 311 is clamped in the clamping groove, so that the sealing effect between the elastic airbag 3 and the connecting pipe 11 is further improved.
Referring to fig. 1 and 2 together, as a specific embodiment of the natural gas pipeline pressure monitoring and warning device provided by the present invention, an axis of the driving rod 4 is parallel to an axis of the sleeve 2. The expansion direction of the elastic air bag 3 and the length direction of the sleeve 2 are arranged in an extending mode, the end portion of the elastic air bag 3 abuts against the end portion of the driving rod 4, so that when the pressure inside the conveying pipeline 1 is increased, the elastic air bag 3 is expanded along the axis direction of the sleeve 2 and drives the driving rod 4 to move, and therefore the alarm unit 7 is triggered.
Referring to fig. 1 and 2 together, a top plate 41 is disposed inside the sleeve 2, and the top plate 41 is disposed between the driving rod 4 and the elastic airbag 3 and is slidably disposed inside the sleeve 2 along an axial direction of the sleeve 2. Roof 41 and the inside sliding fit of sleeve 2, elastic component 5 one end is contradicted on roof 41, and one end is contradicted at the tip that pipeline 1 was kept away from to sleeve 2, can promote roof 41 to keeping away from conflict switch 6 one side and remove. Through the setting of roof 41, can increase the area of contact of elasticity gasbag 3 and actuating lever 4, prevent that the tip damage elasticity gasbag 3 of actuating lever 4 from leading to the natural gas leakage when the air pressure grow in pipeline 1, improve the life of elasticity gasbag 3.
Referring to fig. 1 and 2 together, as a specific embodiment of the natural gas pipeline pressure monitoring and alarming device provided by the present invention, a recess 411 for accommodating the elastic airbag 3 is disposed on one side of the top plate 41 close to the elastic airbag 3. The end of the elastic air bag 3 is located in the groove 411, which can guide the elastic air bag 3, so that the elastic air bag 3 can always keep the parallel state with the axis of the driving rod 4, and the elastic air bag 3 is prevented from being bent in the sleeve 2.
As a specific embodiment of the natural gas pipeline pressure monitoring and alarming device provided by the present invention, please refer to fig. 1 and fig. 2 together, a limit plate 42 is disposed on the driving rod 4, the limit plate 42 is slidably disposed on the driving rod 4 along the axial direction of the driving rod 4, the elastic element 5 is located between the limit plate 42 and the top plate 41, a push rod 43 is disposed between the limit plate 42 and the sleeve 2, the push rod 43 is in threaded connection with the sleeve 2 and is disposed parallel to the driving rod 4, and an end of the push rod 43 abuts against the limit plate 42 for adjusting the position of the limit plate 42 on the driving rod 4. The limiting plate 42 is arranged on the driving rod 4 in a sliding mode along the axis direction of the driving rod 4, the elastic part 5 is located between the limiting plate 42 and the top plate 41, the ejector rods 43 are multiple in number, the axis of the driving rod 4 is arranged on the outer side of the driving rod 4 in a distributed mode at intervals, and the gap between the limiting plate 42 and the top plate 41 can be adjusted by rotating the ejector rods 43, so that the driving force of the elastic part 5 on the top plate 41 is adjusted, and the allowable maximum pressure value of the alarm signal generated by the alarm unit 7 in the conveying pipeline 1 can be adjusted.
In this embodiment, the limiting plate 42 is provided with a mounting socket on a side close to the elastic element 5, and the end of the elastic element 5 is located in the mounting socket.
In this embodiment, the elastic member 5 is a spring, and the larger the compression amount of the spring is, the larger the urging force against the top plate 41 is.
As a specific embodiment of the natural gas pipeline pressure monitoring and alarming device provided by the present invention, please refer to fig. 1 and fig. 2, a clamping member 44 is disposed on the top rod 43, and the clamping member 44 is in threaded connection with the top rod 43 and can abut against the end of the sleeve 2 to fix the top rod 43 on the sleeve 2. The clamping piece 44 is a nut in threaded fit with the push rod 43, and the end of the clamping piece 44 is abutted against the sleeve 2 by rotating the clamping piece 44, so that the push rod 43 can be clamped on the sleeve 2 and cannot rotate on the sleeve 2. The stability in the use process is improved.
Referring to fig. 1 and 2 together, as a specific embodiment of the natural gas pipeline pressure monitoring and alarming device provided by the present invention, the sleeve 2 includes a cylinder 22 and a cover plate 23. The cylinder 22 is arranged on the conveying pipeline 1, and one end of the cylinder is communicated with the conveying pipeline 1; the cover plate 23 is arranged at the other end of the cylinder 22 and is in threaded connection with the cylinder 22, and the driving rod 4 is arranged on the cover plate 23 in a sliding mode. Ejector pin 43 sets up on apron 23 and with apron 23 threaded connection, through can dismantling apron 23 and barrel 22 and be connected, can make things convenient for limiting plate 42 and roof 41's installation, the one end of barrel 22 passes through welded fastening with second flange 21 and is connected, the other end of barrel 22 is provided with the external screw thread, be provided with on the apron 23 with barrel 22 screw-thread fit's internal thread, barrel 22 realizes dismantling each other with apron 23 through threaded connection and is connected, the installation and the dismantlement of the inside each part of barrel 22 of being convenient for.
As a specific embodiment of the natural gas pipeline pressure monitoring and alarming device provided by the present invention, please refer to fig. 1 and fig. 2, a thread bushing 45 for being in threaded connection with the driving rod 4 is disposed on one side of the top plate 41 close to the driving rod 4, and the thread bushing 45 is fixedly connected with the top plate 41. The tip of actuating lever 4 is provided with the external screw thread with thread bush 45 screw-thread fit, and thread bush 45 sets up on roof 41 through welded fastening, through the threaded connection of actuating lever 4 with thread bush 45, makes things convenient for the installation of actuating lever 4.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a natural gas line pressure monitoring alarm device for install on the pipeline of natural gas, its characterized in that includes:
the sleeve is arranged on the conveying pipeline, and one end of the sleeve is connected with the conveying pipeline;
the elastic air bag is arranged inside the sleeve and is communicated with the conveying pipeline;
the driving rod is arranged on the sleeve and is arranged on the sleeve in a sliding manner along the length direction of the driving rod, and one end of the driving rod is abutted against the elastic air bag;
the elastic piece is arranged between the driving rod and the sleeve and used for driving the driving rod to move towards the direction close to the elastic air bag;
the collision switch is arranged on one side, away from the elastic air bag, of the driving rod along the sliding direction of the driving rod, and the driving rod can be collided on the collision switch and used for controlling the collision switch to be turned on or off;
the alarm unit, with conflict switch electric connection, conflict switch is used for controlling alarm unit's operating condition.
2. The natural gas pipeline pressure monitoring alarm device of claim 1, wherein a connection assembly is provided between the sleeve and the delivery pipeline, the connection assembly comprising:
the connecting pipe is fixedly arranged on the conveying pipeline and is communicated with the conveying pipeline;
the first flange is arranged at one end, far away from the conveying pipeline, of the connecting pipe;
the second flange is arranged on the sleeve, is close to one end of the conveying pipeline and is detachably connected with the first flange:
and the sealing ring is arranged at the air inlet of the elastic air bag, surrounds the outer side of the elastic air bag and is positioned between the first flange and the second flange.
3. The natural gas pipeline pressure monitoring and warning device of claim 2, wherein the connection assembly further comprises:
the protruding ring is arranged on the outer side of the sealing ring in a surrounding mode, the protruding ring extends towards the two sides of the sealing ring along the axis direction of the sealing ring, and clamping grooves used for containing the protruding ring are formed in the first flange and the second flange.
4. The natural gas pipeline pressure monitoring and warning device of claim 1 wherein the axis of the drive rod is disposed parallel to the axis of the sleeve.
5. The natural gas pipeline pressure monitoring and alarming device as claimed in claim 4, wherein a top plate is arranged inside the sleeve, is arranged between the driving rod and the elastic air bag and is arranged inside the sleeve in a sliding mode along the axial direction of the sleeve.
6. The natural gas pipeline pressure monitoring and alarming device as claimed in claim 5, wherein a groove for accommodating the elastic air bag is formed on one side of the top plate close to the elastic air bag.
7. The natural gas pipeline pressure monitoring and alarming device as claimed in claim 5, wherein a limiting plate is arranged on the driving rod, the limiting plate is arranged on the driving rod in a sliding manner along the axis direction of the driving rod, the elastic member is located between the limiting plate and the top plate, an ejector rod is arranged between the limiting plate and the sleeve, the ejector rod is in threaded connection with the sleeve and is arranged in parallel with the driving rod, and the end portion of the ejector rod abuts against the limiting plate to adjust the position of the limiting plate on the driving rod.
8. The natural gas pipeline pressure monitoring and alarming device as claimed in claim 7, wherein the ejector rod is provided with a clamping piece, and the clamping piece is in threaded connection with the ejector rod and can abut against the end part of the sleeve to fix the ejector rod on the sleeve.
9. The natural gas pipeline pressure monitoring and warning device of claim 1 wherein the sleeve comprises:
the cylinder is arranged on the conveying pipeline, and one end of the cylinder is communicated with the conveying pipeline;
the cover plate is arranged at the other end of the cylinder body and is in threaded connection with the cylinder body, and the driving rod is arranged on the cover plate in a sliding mode.
10. The natural gas pipeline pressure monitoring and alarming device as claimed in claim 5, wherein a threaded sleeve for being in threaded connection with the driving rod is arranged on one side, close to the driving rod, of the top plate, and the threaded sleeve is fixedly connected with the top plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122480038.1U CN216079352U (en) | 2021-10-14 | 2021-10-14 | Natural gas line pressure monitoring alarm device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122480038.1U CN216079352U (en) | 2021-10-14 | 2021-10-14 | Natural gas line pressure monitoring alarm device |
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| Publication Number | Publication Date |
|---|---|
| CN216079352U true CN216079352U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122480038.1U Active CN216079352U (en) | 2021-10-14 | 2021-10-14 | Natural gas line pressure monitoring alarm device |
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| Country | Link |
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| CN (1) | CN216079352U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114811450A (en) * | 2022-07-01 | 2022-07-29 | 苏州谱测光电科技有限公司 | Gas pipeline protective equipment with prevent leaking function |
| CN115046136A (en) * | 2022-07-07 | 2022-09-13 | 安徽省皖北煤电集团有限责任公司 | Storage device for coal bed gas development |
| CN115770461A (en) * | 2023-02-13 | 2023-03-10 | 四川永沁环境工程有限公司 | Radioactive waste gas treatment device |
-
2021
- 2021-10-14 CN CN202122480038.1U patent/CN216079352U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114811450A (en) * | 2022-07-01 | 2022-07-29 | 苏州谱测光电科技有限公司 | Gas pipeline protective equipment with prevent leaking function |
| CN115046136A (en) * | 2022-07-07 | 2022-09-13 | 安徽省皖北煤电集团有限责任公司 | Storage device for coal bed gas development |
| CN115770461A (en) * | 2023-02-13 | 2023-03-10 | 四川永沁环境工程有限公司 | Radioactive waste gas treatment device |
| CN115770461B (en) * | 2023-02-13 | 2023-04-14 | 四川永沁环境工程有限公司 | Radioactive waste gas treatment device |
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