CN114609345A

CN114609345A - SF6 sensor

Info

Publication number: CN114609345A
Application number: CN202210500073.1A
Authority: CN
Inventors: 杜鉴峰
Original assignee: Beijing Tongyu Technology Co ltd
Current assignee: Beijing Tongyu Technology Co ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2022-06-10
Anticipated expiration: 2042-05-10
Also published as: CN114609345B

Abstract

The invention discloses an SF6 sensor, which belongs to the field of sensors and comprises a shell, wherein the shell comprises a sealing part and a measuring part, the sealing part and the measuring part are integrally arranged, the side wall of the sealing part is provided with an air duct, the air duct penetrates through the side wall of the sealing part, so that one end of the air duct is positioned inside the sealing part, the other end of the air duct is positioned outside the sealing part, the side wall of the air duct positioned in the sealing part is connected with a movable plate through a plurality of reset springs, the side wall of the movable plate is provided with a sealing plug, the sealing plug extends into the air duct, the sealing plug is movably sealed with the air duct, one side of the sealing plug positioned in the air duct is provided with a screen plate, the secondary inflation can be rapidly carried out without disassembly, in addition, the sealing effect can be greatly improved by utilizing the structural matching of liquid, the sealing rings and the like, and the gas leakage is avoided.

Description

SF6 sensor

Technical Field

The invention relates to the field of sensors, in particular to an SF6 sensor.

Background

The sulfur hexafluoride (SF6) has high gas insulation strength, and is widely applied to Gas Insulated Substations (GIS), Gas Insulated Transformers (GIT), gas insulated circuit breakers (GCB) and the like of a power system as an insulation and arc extinguishing medium in the fields of high voltage, ultrahigh voltage and extra-high voltage. Sulfur hexafluoride (SF6) gas leakage can reduce the insulation strength of power equipment, weaken the arc quenching capability, threaten the safe operation of the power equipment and the stable and reliable operation of a power system, and cause personnel injury and atmosphere pollution.

When the SF6 sensor is used, gas leakage not only reduces the sensing capability, but also causes certain potential safety hazard, and only equipment such as a sealing gasket is adopted, so that the service life is short, the sensor is easy to corrode, the sealing capability is not strong, and the sensor is very inconvenient and troublesome to disassemble during secondary inflation.

To this end, we propose an SF6 sensor to solve the above problems.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide the SF6 sensor, which can realize quick secondary inflation without disassembly, and can greatly improve the sealing effect and avoid gas leakage by utilizing the structural matching of liquid, a sealing ring and the like.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

An SF6 sensor comprises a shell, the shell comprises a sealing part and a measuring part, the sealing part and the measuring part are integrally arranged, the side wall of the sealing part is provided with an air duct, the air duct penetrates through the side wall of the sealing part, so that one end of the air duct is positioned inside the sealing part, the other end of the air duct is positioned outside the sealing part, the side wall of the air duct positioned in the sealing part is connected with a movable plate through a plurality of reset springs, the side wall of the movable plate is provided with a sealing plug, the sealing plug extends into the air duct and is movably sealed with the air duct, one side of the sealing plug positioned in the air duct is provided with a screen plate sealing plug, the side wall of the air duct is provided with a plurality of sealing plug connecting pipes, the connecting pipes are arranged on one side of the air duct, so that the sealing plug blocks the connecting pipes, and are arranged to be moved, the connecting pipes are communicated with the air duct, and a separation plate is further arranged between the sealing part and the measuring part, a plurality of through holes are formed in the partition plate, and the air guide pipe is communicated with the through holes.

Further, still include pressure sensor, temperature sensor, automatically controlled portion and antenna, pressure sensor with temperature sensor all is located the measuring part, automatically controlled portion is located one side of measuring part, the antenna is installed in automatically controlled portion top, automatically controlled portion is connected with pressure sensor, temperature sensor and antenna electricity respectively.

Furthermore, the inner wall of the air duct is provided with an annular air bag, the air duct is further provided with a drainage tube, the drainage tube is positioned between the annular air bag and the sealing plug, and the other end of the drainage tube is communicated with the annular air bag.

Further, the lateral wall fixedly connected with movable rod of fly leaf, the movable rod runs through the lateral wall of division board and with division board movable seal, the lateral wall of fly leaf passes through buffer spring and is connected with the lateral wall of division board, and buffer spring overlaps on the movable rod, the other end of movable rod extends to in the measuring part, and the movable rod that is located the measuring part is connected with the mounting panel, a plurality of guide pillars are installed to the lateral wall of mounting panel, the one end of guide pillar is provided with the radius angle, and the guide pillar extends to in the through-hole to with the through-hole contact seal.

Furthermore, an opening is formed in the side wall of the partition plate, a seal sleeve is arranged in the opening, the inner wall of the opening is fixedly connected with the outer side wall of the seal sleeve, the movable rod penetrates through the seal sleeve, and the outer side wall of the movable rod is movably sealed with the inner side wall of the seal sleeve.

Further, the inner wall and the outer wall of the sealing part are both provided with sealing gaskets so that the contact part of the air guide pipe and the sealing part is arranged in a sealing mode, the connecting pipe and the joint of the drainage pipe and the air guide pipe are arranged in a sealing mode, and the contact part of the connecting pipe and the partition plate is arranged in a sealing mode.

Furthermore, the sealing part is filled with sealing liquid, a sealing space is formed between the partition plate and the sealing part, and the sealing liquid fills the whole sealing space.

Furthermore, the lateral wall of sealing portion has still seted up and has annotated the liquid hole, the lateral wall of one side of annotating the liquid hole is equipped with the gland packing, the gland packing is located the sealing portion, the opposite side lateral wall of annotating the liquid hole is provided with the swivel nut, the swivel nut is located outside the sealing portion, be provided with the bolt in the swivel nut, bolt and swivel nut threaded connection, and the lateral wall of bolt is provided with the sealing rod, the sealing rod extends to and contacts sealedly in the gland packing.

Further, the width of the sealing rod is smaller than the inner diameter of the threaded sleeve, and the length of the sealing rod is smaller than that of the sealing pipe.

Further, the lateral wall of swivel nut is smooth to be set up, and the lateral wall of swivel nut still overlaps and is equipped with the seal cover, the inner wall of seal cover and the lateral wall contact of swivel nut are sealed, the inner wall of seal cover is provided with first bulge loop, the lateral wall of swivel nut is provided with the second bulge loop, and the projection of first bulge loop and second bulge loop is convex arc.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) this scheme is when using, insert in the air duct and ventilate to the intake pipe, gaseous entering air duct, then along with the atmospheric pressure increase in the air duct, promote the sealing plug and remove, in the gaseous connecting pipe that gets into, then get into measuring part along connecting pipe and through-hole, accurately measure power equipment's operating condition fast, and aerify and accomplish the back, reset spring's bounce-back can support the fly leaf, it is sealed with the air duct to drive the sealing plug, and separate measuring part and sealing part under the effect of division board, multiple seal assembly seals jointly, the effect is better, and convenient operation when aerifing, only need with the gas tube insert in the air duct can, save trouble fast.

(2) The environment around can be measured fast accurately through pressure sensor and temperature sensor to obtain power equipment's operating condition around, in addition, under the control action of automatically controlled portion, can guarantee that each equipment normally works, and guarantee that the antenna can accurately carry out information exchange with the external world, conveniently control.

(3) When inserting the gas tube into the air duct, when aerifing, during gas can get into the drainage tube, and then in getting into annular gasbag along the drainage tube, and then annular gasbag grow to can contact with the lateral wall of gas tube, and produce frictional force, restrict the position of gas tube, when aerifing, can guarantee the stability of gas tube like this, need not the people and hand, also can stably aerify, alleviate the operation burden.

(4) When the piston removes, promote the fly leaf and remove, and then promote the movable rod and remove, the interactive sensation drives the mounting panel and removes, drives buffer spring simultaneously and takes place deformation, and the mounting panel can drive the guide pillar and remove for guide pillar and division board separation, like this gas can get into the measuring part through the through-hole, thereby accomplish and aerify, aerify the completion back, under buffer spring's reaction force, drive mounting panel and guide pillar and remove, the guide pillar is gone into the through-hole again in the card, accomplishes sealedly.

(5) Through the setting of opening and seal cover, can guarantee with the activity between the movable rod sealed, be equipped with the gas of measuring part and can not get into in the sealing, and the sealing liquid in the sealing also can not get into in the measuring part.

(6) Can guarantee the sealed effect between air duct and the sealing through sealed the pad, and then avoid the sealing liquid in the sealing to leak, also can avoid gas leakage, improve the security of whole device in the use.

(7) Through filling the sealing liquid, not only can further improve sealed effect, the sealing liquid can absorb the heat moreover, absorbs the heat, even guarantee the device under the environment of high temperature, electron device and electric power portion can normally work, promote application scope.

(8) Can conveniently pour into sealing liquid with the sealing into through seting up and annotate the liquid hole, and through the gland packing, can play good sealed effect with the sealing rod cooperation, and utilize the cooperation of swivel nut and bolt, can conveniently be in the same place sealing rod and gland packing installation, simple structure, convenient operation.

(9) The arrangement can reduce the contact between the sealing rod and the sealing liquid, thereby protecting the service life of the sealing rod.

(10) Through the sealing cover on the bolt, further improve sealed effect, also can guarantee the stability of bolt and swivel nut installation simultaneously, even rock comparatively acutely like this, also can avoid bolt and swivel nut separation, and then improve the application scope of whole device, also can safe handling under the comparatively acutely circumstances of vibrations, through the joint effect of first bulge loop and second bulge loop, improve stability, alleviate the collision.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic view of a coupling structure of a threaded sleeve and a bolt according to the present invention;

FIG. 4 is a schematic view showing a connection structure of a sealing portion and a measuring portion according to the present invention;

FIG. 5 is a schematic view of the connection structure of the movable rod and the sealing sleeve of the present invention;

FIG. 6 is a schematic view of the connection structure between the air duct and the return spring according to the present invention;

fig. 7 is a schematic view of the connection structure of the movable plate and the sealing plug of the present invention;

FIG. 8 is a schematic view of the connection structure of the airway tube and the connecting tube of the present invention;

FIG. 9 is a schematic view showing a connection structure of the annular balloon and the drainage tube of the present invention;

FIG. 10 is a schematic structural view of a mounting plate of the present invention;

FIG. 11 is a schematic view of the structure of the airway tube and connecting tube of the present invention.

The reference numbers in the figures illustrate:

1. a housing; 2. a sealing part; 3. a measuring section; 4. a gas-guide tube; 5. a return spring; 6. a movable plate; 7. a sealing plug; 8. a screen plate; 9. a connecting pipe; 10. a partition plate; 11. a pressure sensor; 12. a temperature sensor; 13. an electric control part; 14. an antenna; 15. an annular air bag; 16. a drainage tube; 17. a movable rod; 18. a buffer spring; 19. mounting a plate; 20. a guide post; 21. sealing sleeves; 22. a gasket; 23. sealing liquid; 24. a sealing tube; 25. a threaded sleeve; 26. and (4) bolts.

Detailed Description

The technical solution 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; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-11, an SF6 sensor comprises a housing 1, the housing 1 comprises a sealing part 2 and a measuring part 3, the sealing part 2 and the measuring part 3 are integrally arranged, a gas-guide tube 4 is arranged on the side wall of the sealing part 2, the gas-guide tube 4 penetrates through the side wall of the sealing part 2, so that one end of the gas-guide tube 4 is located inside the sealing part 2, the other end is located outside the sealing part 2, the side wall of the gas-guide tube 4 located in the sealing part 2 is connected with a movable plate 6 through a plurality of reset springs 5, the side wall of the movable plate 6 is provided with a sealing plug 7, the sealing plug 7 extends into the gas-guide tube 4, the sealing plug 7 is movably sealed with the gas-guide tube 4, one side of the sealing plug 7 located in the gas-guide tube 4 is provided with a mesh plate 8, the side wall of the gas-guide tube 4 is provided with a plurality of connecting tubes 9, the connecting tubes 9 are arranged on one side of the connecting tube 7, so that the sealing plug 7 is plugged by the connecting tube 9, and the sealing plug 7 is arranged to be moved, the connecting pipe 9 is communicated with the air guide pipe 4, a partition plate 10 is further arranged between the sealing part 2 and the measuring part 3, a plurality of through holes are formed in the partition plate 10, and the air guide pipe 4 is communicated with the through holes.

The pressure sensor 11 and the temperature sensor 12 are both positioned in the measuring part 3, the electric control part 13 is positioned on one side of the measuring part 3, the antenna 14 is installed above the electric control part 13, and the electric control part 13 is respectively electrically connected with the pressure sensor 11, the temperature sensor 12 and the antenna 14.

The pressure sensor 11 and the temperature sensor 12 can quickly and accurately measure the surrounding environment, so as to obtain the working state of surrounding power equipment, and in addition, under the control action of the electric control part 13, the normal work of each equipment can be ensured, and the antenna 14 can be ensured to accurately exchange information with the outside, so that the control is convenient.

The inner wall of the air duct 4 is provided with an annular air bag 15, a drainage tube 16 is also arranged on the air duct 4, the drainage tube 16 is positioned between the annular air bag 15 and the sealing plug 7, and the other end of the drainage tube 16 is communicated with the annular air bag 15.

When inserting the gas tube into air duct 4, when aerifing, gas can get into in drainage tube 16, and then along drainage tube 16 entering annular gasbag 15, and then annular gasbag 15 grow to can contact with the lateral wall of gas tube, and produce frictional force, restrict the position of gas tube, when aerifing, can guarantee the stability of gas tube like this, need not the people and hand, also can stably inflate, alleviate the operation burden.

The lateral wall fixedly connected with movable rod 17 of fly leaf 6, movable rod 17 runs through the lateral wall of division board 10 and with division board 10 swing joint, the lateral wall of fly leaf 6 passes through buffer spring 18 and is connected with the lateral wall of division board 10, and buffer spring 18 overlaps on movable rod 17, the other end of movable rod 17 extends to in the measuring part 3, and the movable rod 17 that is located measuring part 3 is connected with mounting panel 19, a plurality of guide pillars 20 are installed to mounting panel 19's lateral wall, the one end of guide pillar 20 is provided with the radius angle, and guide pillar 20 extends to in the through-hole, and with through-hole contact seal.

When the piston moves, the movable plate 6 is pushed to move, the movable rod 17 is further pushed to move, the mounting plate 19 is driven to move by the interaction, the buffer spring 18 is driven to deform, the mounting plate 19 can drive the guide pillar 20 to move, the guide pillar 20 is separated from the partition plate 10, gas can enter the measuring part 3 through the through hole, inflation is completed, after inflation is completed, the mounting plate 19 and the guide pillar 20 are driven to move under the reaction force of the buffer spring 18, the guide pillar 20 is clamped into the through hole again, and sealing is completed.

An opening is formed in the side wall of the partition plate 10, a sealing sleeve 21 is arranged in the opening, the inner wall of the opening is fixedly connected with the outer side wall of the sealing sleeve 21, the movable rod 17 penetrates through the sealing sleeve 21, and the outer side wall of the movable rod 17 is movably sealed with the inner side wall of the sealing sleeve 21.

Through the arrangement of the opening and the sealing sleeve 21, movable sealing with the movable rod 17 can be ensured, gas provided with the measuring part 3 cannot enter the sealing part 2, and sealing liquid 23 in the sealing part 2 cannot enter the measuring part 3.

The inner wall and the outer wall of the sealing part 2 are both provided with sealing gaskets 22, so that the contact part of the air duct 4 and the sealing part 2 is arranged in a sealing way, the joint of the connecting pipe 9 and the drainage pipe 16 with the air duct 4 is arranged in a sealing way, and the contact part of the connecting pipe 9 and the partition board 10 is arranged in a sealing way.

The sealing effect between the air duct 4 and the sealing part 2 can be ensured through the sealing gasket 22, so that the sealing liquid 23 in the sealing part 2 is prevented from leaking, gas leakage can be avoided, and the safety of the whole device in the using process is improved.

The sealing part 2 is also filled with sealing liquid 23, a sealing space is formed between the partition plate 10 and the sealing part 2, and the sealing liquid 23 fills the whole sealing space.

Through filling sealing liquid 23, not only can further improve sealed effect, sealing liquid 23 can absorb the heat moreover, absorbs the heat, even guarantee the device under the environment of high temperature, electron device and electric power portion can normally work, promote application scope.

The lateral wall of sealing portion 2 has still been seted up and has been annotated the liquid hole, and the lateral wall of one side of annotating the liquid hole is equipped with sealed tube 24, and sealed tube 24 is located sealing portion 2, and the opposite side lateral wall of annotating the liquid hole is provided with swivel nut 25, and swivel nut 25 is located outside sealing portion 2, is provided with bolt 26 in the swivel nut 25, bolt 26 and swivel nut 25 threaded connection, and the lateral wall of bolt 26 is provided with the sealing rod, and the sealing rod extends to and contacts sealedly in sealed tube 24.

Can conveniently pour into sealing liquid 23 with sealing portion 2 into through seting up annotating the liquid hole, and through gland packing 24, can play good sealed effect with the sealing rod cooperation, and utilize swivel nut 25 and bolt 26's cooperation, can conveniently install sealing rod and gland packing 24 together, simple structure, convenient operation.

The width of the sealing rod is smaller than the inner diameter of the threaded sleeve 25, and the length of the sealing rod is smaller than the length of the sealing tube 24.

This arrangement can reduce the contact of the seal rod with the sealing liquid 23, thereby protecting the service life of the seal rod.

The outer side wall of the screw sleeve 25 is smoothly arranged, the outer side wall of the screw sleeve 25 is further sleeved with a sealing sleeve 21, the inner wall of the sealing sleeve 21 is in contact sealing with the outer side wall of the screw sleeve 25, the inner wall of the sealing sleeve 21 is provided with a first convex ring, the outer side wall of the screw sleeve 25 is provided with a second convex ring, and the projections of the first convex ring and the second convex ring are convex arcs.

The sealing sleeve 21 is sleeved on the bolt 26, so that the sealing effect is further improved, the installation stability of the bolt 26 and the threaded sleeve 25 can be guaranteed, even if the bolt is shaken violently, the bolt 26 and the threaded sleeve 25 can be prevented from being separated, the application range of the whole device is further improved, the bolt can be safely used under the violent vibration condition, the stability is improved and the collision is reduced due to the clamping effect of the first convex ring and the second convex ring.

In the invention, the SF6 density (pressure) detection has good repeatability, fast response speed, automatic data value reporting, and the value reporting period can be set according to the requirements of users, and supports the advantages of on-line density low-voltage threshold value alarm, pollution resistance, interference resistance, high sensitivity and good stability, and the measuring range is 0-1.6MPa, the protection grade is IP65, the leakage rate is s1 x 10-9Pa-m3/s, (helium leakage detection) 1000mAh lithium ion battery is adopted as a power supply, the service life is 6 years, replaceable, 2-time value reports every day, the measurement precision is 0.2 grade at 20 ℃, 0.5 grade from minus 40 ℃ to plus 60 ℃, the working dimension is from minus 40 ℃ to plus 60 ℃, the relative humidity is less than or equal to 95% RH, the interface size is M20 x 1.5, and the communication protocol is customized according to needs, 470MHzLora communication is adopted, and the communication protocol conforms to the standard protocol of the national network Internet of things.

When using, insert in the air duct 4 and ventilate to the intake pipe, gas gets into in the air duct 4, then increase along with the atmospheric pressure in the air duct 4, promote sealing plug 7 and remove, until gas gets into in connecting pipe 9, then get into measuring part 3 along connecting pipe 9 and through-hole, accurately measure power equipment's operating condition fast, and aerify the completion back, reset spring 5's bounce can support fly leaf 6, it is sealed with air duct 4 to drive sealing plug 7, and separate measuring part 3 and sealing part 2 under the effect of division board 10, multiple seal assembly seals jointly, the effect is better, and convenient operation when aerifing, only need with the gas tube insert in the air duct 4 can, save trouble fast.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. An SF6 sensor comprising a housing (1), characterized in that: the shell (1) comprises a sealing part (2) and a measuring part (3), the sealing part (2) and the measuring part (3) are integrally arranged, the side wall of the sealing part (2) is provided with an air duct (4), the air duct (4) penetrates through the side wall of the sealing part (2) so as to enable one end of the air duct (4) to be located inside the sealing part (2) and the other end of the air duct to be located outside the sealing part (2), the side wall of the air duct (4) located in the sealing part (2) is connected with a movable plate (6) through a plurality of reset springs (5), the side wall of the movable plate (6) is provided with a sealing plug (7), the sealing plug (7) extends into the air duct (4), the sealing plug (7) is movably sealed with the air duct (4), one side, located in the air duct (4), of the sealing plug (7) is provided with a screen plate (8), the side wall of the air duct (4) is provided with a plurality of connecting pipes (9), connecting pipe (9) set up in one side of sealing plug (7) to make sealing plug (7) plug up connecting pipe (9), and sealing plug (7) set up to the removal back, connecting pipe (9) and air duct (4) intercommunication, sealing portion (2) with still be provided with division board (10) between measurement portion (3), a plurality of through-holes have been seted up on division board (10), air duct (4) and through-hole intercommunication.

2. An SF6 sensor according to claim 1, wherein: still include pressure sensor (11), temperature sensor (12), automatically controlled portion (13) and antenna (14), pressure sensor (11) with temperature sensor (12) all are arranged in measuring part (3), automatically controlled portion (13) are arranged in one side of measuring part (3), install in automatically controlled portion (13) top antenna (14), automatically controlled portion (13) are connected with pressure sensor (11), temperature sensor (12) and antenna (14) electricity respectively.

3. The SF6 sensor of claim 1, wherein: the inner wall of the air duct (4) is provided with an annular air bag (15), a drainage tube (16) is further arranged on the air duct (4), the drainage tube (16) is located between the annular air bag (15) and the sealing plug (7), and the other end of the drainage tube (16) is communicated with the annular air bag (15).

4. An SF6 sensor according to claim 1, wherein: the lateral wall fixedly connected with movable rod (17) of fly leaf (6), movable rod (17) run through the lateral wall of division board (10) and with division board (10) movable seal, the lateral wall of fly leaf (6) passes through buffer spring (18) and is connected with the lateral wall of division board (10), and buffer spring (18) cover is on movable rod (17), the other end of movable rod (17) extends to in measuring part (3), and is located movable rod (17) of measuring part (3) and is connected with mounting panel (19), a plurality of guide pillars (20) are installed to the lateral wall of mounting panel (19), the one end of guide pillar (20) is provided with the radius angle, and guide pillar (20) extend to in the through-hole to with the through-hole contact seal.

5. An SF6 sensor as in claim 4, wherein: the opening has been seted up to the lateral wall of division board (10), be provided with seal cover (21) in the opening, and the lateral wall fixed connection of open-ended inner wall and seal cover (21), movable rod (17) run through seal cover (21), and the lateral wall of movable rod (17) and the inside wall activity of seal cover (21) are sealed.

6. An SF6 sensor according to claim 3, wherein: the inner wall and the outer wall of sealing part (2) all are provided with sealed pad (22) to make the contact site of air duct (4) and sealing part (2) seal up the setting, connecting pipe (9) with drainage tube (16) with the junction of air duct (4) seals up the setting, connecting pipe (9) with the contact site of division board (10) seals up the setting.

7. The SF6 sensor of claim 1, wherein: the sealing part (2) is also filled with sealing liquid (23), a sealing space is formed between the partition plate (10) and the sealing part (2), and the sealing liquid (23) fills the whole sealing space.

8. An SF6 sensor according to claim 7, wherein: the utility model discloses a sealing structure, including sealing portion (2), liquid filling hole, swivel nut (25), bolt (26) and swivel nut (25), the lateral wall of liquid filling hole still has seted up annotates the liquid hole, the lateral wall of one side of annotating the liquid hole is equipped with sealed tube (24), sealed tube (24) are arranged in sealing portion (2), the opposite side lateral wall of annotating the liquid hole is provided with swivel nut (25), swivel nut (25) are arranged in sealing portion (2) outside, be provided with bolt (26) in swivel nut (25), bolt (26) and swivel nut (25) threaded connection, and the lateral wall of bolt (26) is provided with the sealing rod, the sealing rod extends to and contacts sealedly in sealed tube (24).

9. An SF6 sensor according to claim 8, wherein: the width of the sealing rod is smaller than the inner diameter of the threaded sleeve (25), and the length of the sealing rod is smaller than that of the sealing pipe (24).

10. An SF6 sensor according to claim 9, wherein: the outer side wall of swivel nut (25) sets up smoothly, and the outer side wall of swivel nut (25) still overlaps and is equipped with seal cover (21), the inner wall of seal cover (21) is sealed with the lateral wall contact of swivel nut (25), the inner wall of seal cover (21) is provided with first bulge loop, the lateral wall of swivel nut (25) is provided with the second bulge loop, and the projection of first bulge loop and second bulge loop is convex arc.