CN201247215Y

CN201247215Y - Protection device for sensor

Info

Publication number: CN201247215Y
Application number: CNU2008201851608U
Authority: CN
Inventors: 王茂祥
Original assignee: CHANGZHOU AITE TECHNOLOGY CO LTD
Current assignee: CHANGZHOU AITE TECHNOLOGY CO LTD
Priority date: 2008-08-25
Filing date: 2008-08-25
Publication date: 2009-05-27
Anticipated expiration: 2018-08-25

Abstract

The utility model discloses a protecting device of a sensor, in particular to the protecting device of a temperature sensor which is used for an SF6 gas micro-water tester. The device comprises a main gas chamber, wherein a metering orifice is arranged on the external wall of the main gas chamber, a sensing gas chamber is movably arranged in the main gas chamber, a charging cavity is arranged in the main gas chamber, an adsorption tank is arranged in the charging cavity, the sensing gas chamber is provided with the inner cavity which can contain the sensor is arranged in the sensor gas chamber, a through-hole is arranged between the inner cavity and the sensor gas chamber, the metering orifice is communicated with the inner cavity through the through-hole, and the charging cavity is communicated with the inner cavity through the adsorption tank and the through-hole. The device can enable the sensor to switch between measuring and protecting, can absorb decomposition products of SF6 gas which are remained in the sensor through the adsorption function, can insulate the sensor and water in air and can greatly improve the service life of the sensor.

Description

Protector for sensor

Technical field

The utility model relates to the sensor protection technical field, especially a kind of SF ₆The protective device of the used humidity sensor of the little water tester of gas.

Background technology

SF ₆Gas has stronger insulating property, is widely used in the high voltage electric equipment, and along with rapid development of national economy, SF ₆The gas high-voltage electrical apparatus is very universal in application on power system, still, uses equipment for many years, is subjected to aspects such as site environment, weather conditions to influence SF ₆The content of the minor amount of water in the gas often exceeds standard, and SF ₆The content of the minor amount of water in the gas is unusual important index, and it not only influences the insulating property of equipment, and moisture can decomposite poisonous or harmful suboxides material in gas under arcing, and equipment and materials is played corrosive attack, therefore needs regularly to SF ₆Micro-moisture in the gas detects.

Little water tester at present commonly used mainly adopts the humidity sensor of import, test SF ₆Need the SF in the equipment during micro-moisture in the gas ₆Gas stream is crossed humidity sensor, and now all is to adopt common humidity sensor air chamber, after long-term the use, and SF ₆Can resolve into H ₂S, SO ₂, HF, form acidic materials after meeting water, damage sensor, simultaneously because humidity sensor does not add any protection, and long term exposure is in air, and humidity is bigger in the air, be not only the very slow and waste SF of test speed ₆Gas has caused very big economic loss to the user.

The utility model content

The technical problems to be solved in the utility model is: the utility model provides a kind of protector for sensor at the deficiencies in the prior art, and it can switch sensor between measurement and protection, by the adsorbent effect, and can be with the SF that is trapped in the sensor ₆Gas decomposition product adsorbs to fall, and makes sensor and airborne moisture completely cut off the serviceable life of having improved sensor greatly.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of protector for sensor; has main gas tank; main gas tank's outer wall is provided with measured hole; rotate in the main gas tank and be provided with the sensor air chamber, be provided with packing cavity in the main gas tank, have adsorption tank in the packing cavity; the sensor air chamber has the inner chamber that can place sensor; have through hole between inner chamber and sensor gas chamber outer wall, measured hole is communicated with inner chamber by through hole, and packing cavity is communicated with inner chamber by adsorption tank and through hole.

In order to make the sensor air chamber rotate in main gas tank flexibly, cooperate closely, main gas tank and the sensor air chamber place of matching have tapered bore, and main gas tank's wall at tapered bore small end place is provided with sensor interface.

For can be better SF ₆Gas decomposition product adsorbs to fall, deposit more adsorbent, be provided with two packing cavities in the main gas tank, each one up and down, fall in the inner chamber of sensor air chamber for preventing to fill out the materials of putting such as adsorbent, be fixed with screen pack on the adsorption tank of opening on the packing cavity, be stamped cover plate on packing cavity, cover plate is fixed in the main gas tank, puts for making things convenient for filling out of adsorbent, cover plate is provided with stuffing hole, is connected with silently on the stuffing hole.

Inner chamber one end of sensor air chamber has the cylindrical cone that the tapered bore with main gas tank matches, and the other end is connected with rotary handle, makes things convenient for the rotation sensor air chamber, and being used to select sensor is in working order or guard mode.

Measured hole on main gas tank's outer wall has two, is respectively air admission hole and venthole, is connected with the measurement bolt on the measured hole.

Described through hole is two slots, is symmetrical in the axis setting of sensor air chamber, and main gas tank is fixedly connected with seal cover board and O-ring seal being positioned at position, sensor interface opposite.

The beneficial effects of the utility model are; after the utility model adopts above structure; by rotary handle rotation sensor air chamber; can easily sensor be switched between measurement and protection; when sensor is in guard mode; by filling out the adsorbent effect of putting in the packing cavity, can be with the SF that is trapped in the sensor ₆Gas decomposition product and water adsorption are fallen, and sensor and airborne moisture are completely cut off, and have improved the serviceable life of sensor greatly, and have reduced SF ₆Gas purging helps environmental protection.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the A-A cut-open view of Fig. 1, and for convenience of description, wherein part 2 has turned over 90 °.

Among the figure 1. main gas tank, 11. measured holes, 12. packing cavities, 13. adsorption tanks, 14. sensor interfaces, 2. sensor air chambers, 21. inner chambers, 22. through holes, 3. cover plates, 31. stuffing holes 4. silently 5. rotary handles, 6. screen packs 7. measure bolts 8. O-ring seals 9. seal cover boards

Embodiment

As Fig. 1 shown in Figure 2 be a kind of preferred embodiment of the present utility model; a kind of protector for sensor; has square main gas tank 1; main gas tank's 1 outer wall is provided with two measured holes 11; be respectively air admission hole and venthole; be connected with the measurement bolt 7 that has aperture on the measured hole 11; rotate in the main gas tank 1 and be provided with sensor air chamber 2; main gas tank 1 has tapered bore; sensor air chamber 2 one ends have the cylindrical cone that the tapered bore with main gas tank 1 matches equally, and the other end is connected with rotary handle 5, and upper-lower position is respectively arranged with two packing cavities 12 in main gas tank 1; can deposit more adsorbent, can be better SF ₆Gas decomposition product adsorbs to fall; the protection sensor; have adsorption tank 13 on two packing cavities 12; on packing cavity 12, be stamped cover plate 3; cover plate 3 is fixed in the main gas tank 1; put for making things convenient for filling out of adsorbent; cover plate 3 is provided with stuffing hole 31; be threaded silently 4 on the stuffing hole 31; sensor air chamber 2 has the inner chamber 21 that can place sensor probe, has through hole 22 between inner chamber 21 and sensor air chamber 2 outer walls, and this through hole 22 is two slots; be symmetrical in the axis setting of sensor air chamber 2; measured hole 11 is communicated with inner chamber 21 by through hole 22, and packing cavity 12 is communicated with inner chamber 21 by adsorption tank 13 and through hole 22, is 90 ° of angles between measured hole 11 and the adsorption tank 13; make the sensor air chamber rotate 90 ° of angles with rotary handle 5; then the through hole 22 of sensor air chamber 2 is communicated with adsorption tank 13 and measured hole 11 respectively, can make sensor be in guard mode and measurement state respectively, for preventing to fill out the inner chamber that the materials of putting such as adsorbent fall into sensor air chamber 2; on adsorption tank, be fixed with screen pack 6

The wall at main gas tank 1 tapered bore small end place is provided with sensor interface 14; sensor interface 14 has the connection screw; sensor is connected with sensor interface 14 by the external thread on it; add that O-ring seal tightens; the probe of sensor is in the inner chamber 21 of sensor air chamber 2; when the rectangular through holes 22 of sensor air chamber 2 is communicated with coincidence with the adsorption tank 13 of packing cavity 12; the probe of sensor will contact with the chemical substances such as adsorbent deposited in the packing cavity 12; so just can be with the moisture above the sensor probe; acidic materials adsorb to fall; reach the purpose of protection sensor; be fixedly connected with seal cover board 9 and O-ring seal 8 in the position, opposite of sensor interface 14, seal cover board 9 is threaded with main gas tank 1.

The utility model in use, being filled in packing cavity 12 from stuffing hole 31 can adsorption moisture and the chemical substance of the granular adsorption agent of acidic materials and so on, load onto silently 4, sensor is packed into from sensor interface 14, add O-ring seal and tighten by screw thread, rotate rotary handle 5, when the rectangular through holes 22 of sensor air chamber 2 is communicated with measured hole 11, with SF ₆Gas feeds measured hole 11; just can measure, after measuring, rotary handle 5 changes 90 °; make the rectangular through holes 22 of sensor air chamber 2 be communicated with coincidence with the adsorption tank 13 of packing cavity 12; sensor is in guard mode, when using next time, only needs to rotate rotary handle 5; the through hole 22 of sensor air chamber 2 is communicated with measured hole 11 to get final product; can improve measuring speed greatly, save tester's time, the more important thing is and reduced SF ₆Gas purging, promptly energy-conservation environmental protection again, the while has also prolonged the serviceable life and the check-verifying period of sensor.

Claims

1. protector for sensor; has main gas tank (1); main gas tank (1) outer wall is provided with measured hole (11); it is characterized in that: rotate in the main gas tank (1) and be provided with sensor air chamber (2); be provided with packing cavity (12) in the main gas tank (1); be provided with adsorption tank (13) in the packing cavity (12); sensor air chamber (2) has the inner chamber (21) that can place sensor; have through hole (22) between inner chamber (21) and sensor air chamber (2) outer wall; measured hole (11) is communicated with inner chamber (21) by through hole (22), and packing cavity (12) is communicated with inner chamber (21) by adsorption tank (13) and through hole (22).

2. protector for sensor according to claim 1 is characterized in that: described main gas tank (1) and sensor air chamber (2) place of matching have tapered bore, and main gas tank (1) wall at tapered bore small end place is provided with sensor interface (14).

3. protector for sensor according to claim 1 is characterized in that: described packing cavity (12) is two, and upper and lower settings is stamped cover plate (3) on it, and cover plate (3) is fixed in the main gas tank (1).

4. protector for sensor according to claim 3 is characterized in that: described cover plate (3) is provided with stuffing hole (31), and stuffing hole is connected with silently (4) on (31).

5. protector for sensor according to claim 1 is characterized in that: inner chamber (21) one ends of described sensor air chamber (2) have the cylindrical cone that the tapered bore with main gas tank (1) matches, and the other end is connected with rotary handle (5).

6. protector for sensor according to claim 1 is characterized in that: be fixed with screen pack (6) on the described adsorption tank (13).

7. protector for sensor according to claim 1 is characterized in that: described measured hole (11) has two, is connected with on the measured hole (11) to measure bolt (7).

8. protector for sensor according to claim 1 is characterized in that: described through hole (22) is two slots, is symmetrical in the axis setting of sensor air chamber (2).

9. protector for sensor according to claim 1 is characterized in that: described main gas tank (1) is fixedly connected with seal cover board (9) and O-ring seal (8) being positioned at sensor interface (14) position, opposite.