CN201327594Y - Anti-vibration pointer type SF* gas density controller - Google Patents
Anti-vibration pointer type SF* gas density controller Download PDFInfo
- Publication number
- CN201327594Y CN201327594Y CNU2008201542680U CN200820154268U CN201327594Y CN 201327594 Y CN201327594 Y CN 201327594Y CN U2008201542680 U CNU2008201542680 U CN U2008201542680U CN 200820154268 U CN200820154268 U CN 200820154268U CN 201327594 Y CN201327594 Y CN 201327594Y
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- Prior art keywords
- movement
- contact operating
- operating axis
- sector gear
- gas density
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Abstract
The utility model discloses an anti-vibration pointer type SF6 gas density controller which comprises a base, a C-shaped pipe, a temperature compensation element, a machine core, a plurality of micro switches, adjusting parts corresponding to the micro switches and an contact operating axle, wherein, one end of the contact operating axle is connected on a rotating axle of a sector gear for the machine core and rotates along with the rotation of the rotating axle of the sector gear, thread through holes corresponding with the quantity of the adjusting parts are radially arranged on the contact operating axle along the length direction at intervals, and each adjusting part is spliced in one thread through hole. Since the contact operating axle has the excellent functions of positioning and limiting and cannot swing, the problems of pointer clipping or failure, and the displacement of the micro switches and the adjusting parts when the switch vibrates or the displacement of the C-shaped pipe is more than that of the operating arms of the micro switches, are thoroughly solved. The utility model has higher anti-vibration performance, can fully overcome the problem of oil leakage without silicone oil, has the advantage of vibration resistance and can be well applied to the SF6 electric apparatus.
Description
Technical field
The utility model relates to a kind of controller, relates in particular to a kind of SF of being applied in
6Vibration pointer type SF on (sulfur hexafluoride) electrical equipment
6Gas density controller.
Background technology
SF
6Electric product has been widely used in power department, industrial and mining enterprises, has promoted the fast development of power industry.
SF
6The arc-extinguishing medium of electric product and insulating medium are SF
6Gas can not leak gas.If leak gas, just can not guarantee SF
6The reliable and secure operation of electric product.So monitoring SF
6The SF of electric product
6Density value is very necessary.
Generally adopt at present a kind of pointer SF of machinery
6Gas density controller is monitored SF
6Density is promptly worked as SF
6This controller can be reported to the police and locking when gas leakage took place electric product, can also show on-the-spot density value simultaneously.
This density controller generally adopts single temperature compensating element and hairspring type electric contact, help formula suction though increased magnetic, the reliable closure of docking point is helpful, but the difference of density value when also causing actual act and pointer displayed value, in addition when density is higher than setting value, its movable contact is to move along with pointer, because the power of hairspring is very little, make magnetic help formula suction can not transfer too greatly, in case when density value had arrived setting working value (report to the police or locking), signalling contact (reporting to the police or locking) had moved, if pointer in its vicinity at this moment, can produce vibration, signal is disconnected again, send misoperation.In addition, when contact (reporting to the police or locking) was closed, its closing force only depends on the small power of the hairspring of contact, helps formula power even add magnetic, and was also still very little, therefore extremely was afraid of to shake.In order to improve its vibration resistance, generally all be filled with silicone oil, but because on making, ubiquity leakage of oil problem.In case leakage of oil, the user has only replacing again, causes economic loss.
So, develop a kind of do not need oil-filled, but the good pointer SF of its performance
6Gas density controller is very important.
A kind of contact of developing now adopts the no oil type SF of microswitch
6Gas density controller, this SF
6The structure of gas density controller as shown in Figure 1 and Figure 2, it comprises SF6 gas connection 1, movement 2, watchcase 3, index dial 4, pointer 5, C shape pipe 6, temperature compensating element 7, junction block 8, microswitch 91,92,93, printed circuit board 10, location-plate 11, fixed head 12, electric wire 13, adjuster bar 141,142,143, connecting link 15, contact operating axis 16, watch glass 17, cover circle 18, pedestal 19 and SF
6Air shooter 20.Wherein, SF
6 Gas connection 1, junction block 8, watch glass 17, cover circle 18 and pedestal 19 are separately fixed on the watchcase 3.Movement 2 and fixed head 12 are installed in respectively on the pedestal 19, and pointer 5 and index dial 4 are separately fixed on the movement 2.One end of C shape pipe 6 is welded on the pedestal 19 and is communicated with it, the other end is connected with an end of temperature compensating element 7 by the end seat, the other end of temperature compensating element 7 is connected with contact operating axis 16, one end of contact operating axis 16 is connected with an end of connecting link 15, and the other end of connecting link 15 is connected with movement 2.Be fixed with adjuster bar 141,142,143 on the contact operating axis 16.Microswitch 91,92,93 is welded on respectively on the printed circuit board 10, and printed circuit board 10 is installed on the fixed head 12, and fixed head 12 is installed in again on the pedestal 19.Microswitch 91 is fixed on the below of adjuster bar 141, and microswitch 92 is fixed on the below of adjuster bar 142, and microswitch 93 is fixed on the below of adjuster bar 143.Be respectively equipped with motion arm 911,921,931 on each microswitch.Location-plate 11 is fixed on the movement 2; its front end extends to the below of the end seat of C shape pipe 6 ends that link to each other with temperature compensating element 7; its function is: when the SF6 gas density drops to certain value; spacing C shape pipe 6 moves down; the protection microswitch; and then protection contact operating axis 16 do not damaged by pressure and is out of shape, and makes total system keep reliably working.
The contact of microswitch by electric wire 13, is connected on the junction block 8 from printed circuit board 10, and junction block 8 is fixed on the watchcase 3.Watch glass 17, cover circle 18 are separately fixed on the watchcase 3, can protect its internal mechanism to avoid mechanical damage and dirt, rainwater are invaded.SF
6One end of air shooter 20 is connected with pedestal 19, and positiver sealing, SF
6The other end of air shooter 20 is connected with joint 1, and positiver sealing.
Above-mentioned SF
6Though the microswitch that gas density controller adopted has certain advantage,, in use still there is following problem because its structure is unreasonable:
1, because this SF
6Gas density controller can cause the swing of microswitch motion arm when the judder of switch breaking-closing operating, be easy to cause the output of malfunction signal, can not guarantee system's reliably working.
2, because this SF
6Gas density controller is when the judder of switch breaking-closing operating, the beat of pointer is big, cause the dislocation of adjuster bar and microswitch motion arm occurrence positions, and adjuster bar is blocked or break away from the phenomenon of microswitch motion arm, thereby can not guarantee system's reliably working.
In sum, be necessary to develop and a kind ofly do not want oil-filled and the good pointer SF of resistance to shock
6Gas density controller is to guarantee system's reliably working.
Summary of the invention
In order to solve the problems referred to above that prior art exists, the purpose of this utility model is to provide a kind of oil-filled, good vibration pointer type SF of resistance to shock that do not need
6Gas density controller is used for control and monitors airtight container SF
6The density of gas, and at SF
6The gas leakage situation that occurs in the electrical equipment is in time sent alerting signal and block signal, for ensureing that electric power safety plays effect.
The technical scheme that realizes above-mentioned purpose is: a kind of vibration pointer type SF
6Gas density controller comprises SF
6The watchcase of gas density controller, be arranged on the pedestal in this watchcase, C shape pipe, temperature compensating element, movement, some microswitches, with corresponding regulating part of microswitch and contact operating axis, described movement comprises the movement train wheel bridge, the movement middle clamp plate that be arranged in parallel with the movement train wheel bridge, the sector gear that is connected across the shaft gear between movement train wheel bridge and the movement middle clamp plate rotationally and is connected with a joggle with this shaft gear, one end of described contact operating axis is connected in the rotating shaft of sector gear of movement and with the rotating shaft of this sector gear and rotates, radially spaced apart along its length being provided with and the corresponding threaded perforations of regulating part on this contact operating axis, described each regulating part is plugged in the threaded perforations and its end is resisted against on the motion arm of microswitch.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein: described movement also comprises the movement lower plate that be arranged in parallel with the movement middle clamp plate, one end of described contact operating axis is connected in the rotating shaft of sector gear, the other end is rotatably connected on the movement lower plate, and described some regulating parts are located on the contact operating axis between movement middle clamp plate and the movement lower plate.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein: be provided with the hole to adjustment part between the rotating shaft of described sector gear and the contact operating axis, when the threaded perforations direction of contact operating axis is adjusted to correct position, described hole joins the rotating shaft of sector gear and this contact operating axis together to adjustment part, so that described regulating part is fixed on the position of contact operating axis proper orientation.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein: described hole is ended a screw to adjustment part by the bulge loop of the rotating shaft junction that is located at contact operating axis and sector gear and and is constituted, the diameter coupling of the internal diameter of this bulge loop and the rotating shaft of sector gear, and on its outer peripheral face, radially offer one and end a screw, when the threaded perforations direction on the contact operating axis is adjusted to correct position, with the rotating shaft sleeve of sector gear in this bulge loop, only be connected in the screw with ending a screw threads again, the rotating shaft of contact operating axis and sector gear is fixedlyed connected.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein: the rotating shaft extension that described contact operating axis is a sector gear, the rotating shaft of this sector gear can be connected across respectively on movement train wheel bridge, movement middle clamp plate, movement lower plate or movement train wheel bridge, movement middle clamp plate or movement train wheel bridge, the movement lower plate of movement.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein: described regulating part is a set screw, and regulating part is provided with locking member, this locking member is a set nut.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein: the width of described temperature compensating element is 5.5～18mm.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein: described density controller comprises that also one is located at the chassis of watchcase bottom, and is fixedly connected by several vibration dampers between this chassis and the watchcase.
Above-mentioned vibration pointer type SF
6Gas density controller, wherein, the width of described C shape pipe is 20～40mm.
The utility model vibration pointer type SF
6Gas density controller makes it compared with prior art owing to adopted above technical scheme, has following tangible advantage and characteristics:
Because the two ends of contact operating axis are connected on the movement, make the contact operating axis that good location and position-limiting action arranged, and then make regulating part that good location and position-limiting action just arranged, when the microswitch divide-shut brake produces vibration, can prevent that regulating part from blocking or breaking away from the phenomenon of microswitch, misoperation can not take place, guarantee system's reliably working, improved this pointer SF greatly
6The resistance to shock of gas density controller and precision property are a kind of genuine vibration resistance pointer-type SF
6Gas density controller.Have the advantage of not being afraid of vibration, can not fill silicone oil, overcome the leakage of oil problem fully, can be applied in SF well
6On the electrical equipment.
Description of drawings
Fig. 1 is prior art pointer-type SF
6The structural representation of gas density controller;
Fig. 2 is the partial side view of structure shown in Figure 1;
Fig. 3 is vibration pointer type SF of the present utility model
6The inner structure synoptic diagram of gas density controller;
Fig. 4 is vibration pointer type SF of the present utility model
6The skeleton view of the inner structure of gas density controller;
Fig. 5 is the side view of position relation between microswitch and the regulating part in the structure shown in Figure 4.
Fig. 6 is vibration pointer type SF of the present utility model
6The skeleton view of another inner structure of gas density controller;
Fig. 7 is the side view of position relation between microswitch and the regulating part in the structure shown in Figure 6;
Fig. 8 is vibration pointer type SF of the present utility model
6The side view of gas density controller;
Fig. 9 is vibration pointer type SF of the present utility model
6The structural representation of the index dial of gas density controller.
Embodiment
In order to understand the technical solution of the utility model better, below by embodiment particularly and be described in detail in conjunction with the accompanying drawings:
The action contact of present embodiment is an example with three microswitch types.
See also Fig. 3 and Fig. 4 and in conjunction with Fig. 1 and Fig. 2, vibration pointer type SF of the present utility model
6Gas density controller is mainly by a joint 1, a movement 2, a watchcase 3, an index dial 4, a pointer 5, C shape pipe 6, one temperature compensating element 7, a junction block 8, three microswitches 91,92,93, a printed circuit board 10, a location-plate 11, a fixed head 12, an electric wire 13, three regulating parts 141,142,143, a connecting link 15, a contact operating axis 16, a watch glass 17, cover circle 18, one pedestal 19 and a deferent 20, wherein
The width of temperature compensating element 7 is 5.5～18mm; The width of C shape pipe 6 is 20～40mm;
One end of contact operating axis 16 is connected in the rotating shaft 24 of sector gear of movement 2 and with the rotating shaft 24 of this sector gear and rotates, and promptly an end of this contact operating axis 16 is connected in the rotating shaft 24 of sector gear, and the other end is rotatably mounted on the movement lower plate 23;
Contact operating axis 16 can be rotating shaft 24 extensions of sector gear, and the rotating shaft of this sector gear can be connected across respectively on movement train wheel bridge 21, movement middle clamp plate 22, movement lower plate 23 or movement train wheel bridge 21, movement middle clamp plate 22 or movement train wheel bridge 21, the movement lower plate 23 of movement.
Radially at interval offer three along its length on this contact operating axis 16 and be respectively applied for the threaded perforations of fixing three regulating parts 141,142,143, each regulating part 141,142,143 is plugged in the threaded perforations and its end is resisted against respectively on the motion arm 911 ', 921 ', 931 ' of microswitch 91,92,93; Regulating part 141,142,143 is a set screw, is respectively equipped with locking member 151,152,153 on the regulating part 141,142,143, and this locking member 151,152,153 is a set nut; Can regulate the working value of microswitch 91,92,93 easily, regulate, just fastening with locking member 151,152,153, can raise labour productivity greatly like this, increase work efficiency.
Contact operating axis 16 is unrestricted with the type of attachment of the rotating shaft 24 of sector gear, can variation.When the rotating shaft 24 of contact operating axis 16 and sector gear is two-part, the direction of threaded perforations can be regulated on the contact operating axis 16, promptly between the rotating shaft 24 of contact operating axis 16 and sector gear, can be provided with a hole to adjustment part, this hole is ended a screw 16 to adjustment part by a sleeve 16 ' and " constitute; a headgear of this sleeve 16 ' is connected in the rotating shaft 24 of sector gear; the diameter of the internal diameter of other end and contact operating axis 16 mates; and end a screw near radially offering one on the outer peripheral face of other end; and after when the threaded perforations direction on the contact operating axis 16 is transferred to correct position, inserting sleeve 16 '; end a screw 16 " be screwed in and end in the screw, the rotating shaft 24 of contact operating axis 16 and sector gear is fixedlyed connected, even regulating part 141,142,143 are fixed on the position of these contact operating axis 16 proper orientation.
In another embodiment, the hole is ended a screw 16 to adjustment part by being located at contact operating axis 16 bulge loop 16 ' and with rotating shaft 24 junctions of sector gear " constitute; the diameter coupling of the internal diameter of this bulge loop 16 ' and the rotating shaft of sector gear 24; and on its outer peripheral face, radially offer and end a screw; when the threaded perforations direction on the contact operating axis 16 is adjusted to correct position; with rotating shaft 24 sleeves of sector gear in this bulge loop 16 '; again with a screw 16 only " be screwed in and end in the screw, the rotating shaft 24 of contact operating axis 16 and sector gear is fixedlyed connected, even regulating part 141,142,143 are fixed on the position of these contact operating axis 16 proper orientation.
Because contact operating axis 16 has had good location and position-limiting action, make regulating part 141,142,143 that good location and position-limiting action just arranged, can prevent that regulating part 141,142,143 from blocking or breaking away from the phenomenon of microswitch 91,92,93, misoperation can not take place, guarantee system's reliably working.
See also Fig. 5 to Fig. 7 again, vibration pointer type SF of the present utility model
6Gas density controller, its regulating part drives microswitch contact point signal is exported, be that motion arm 911 ', 921 ', 931 ' on each microswitch 91,92,93 can contact with corresponding regulating part 141,142,143 at an arbitrary position, or the button on each microswitch 91,92,93 91 ', 92 ', 93 ' can directly contact with corresponding regulating part 141,142,143.
Density controller can also have chassis 26, and to keep away the pad that shakes 27 fixedly connected by some between this chassis 26 and the watchcase 3, as shown in Figure 8.Owing to the buffer action of keeping away the pad 27 that shakes has been arranged, can further improve the resistance to shock of density controller.
The utility model can also make the density controller indication range accomplish-0.1MPa, and this brings the convenience of use to the user, just can show its vacuum values when vacuumizing as tonifying Qi, as shown in Figure 9.
The utility model vibration pointer type SF
6The action principle of gas density controller is based on flexible member C shape pipe 6, utilizes the pressure and temperature of 7 pairs of variations of temperature compensating element to revise, reaction SF
6The variation of gas density.Promptly at measured medium SF
6Under the pressure effect of gas, because the effect of temperature compensating element 7 has been arranged, the variation of its density value, force value also changes accordingly, force the end of C shape pipe 6 to produce corresponding elastic deformation-displacement,, pass to movement 2 by means of temperature compensating element 7 and connecting link 15, movement 2 passes to pointer 5 again, satisfies tested SF
6The gas density value indicates on index dial 4.If leaked gas, its density value drops to a certain degree (reach and report to the police or the locking value), and C shape pipe 6 produces accordingly to bottom offset, by the effect of temperature compensating element 7 and connecting link 15, the sector gear rotating shaft 24 of movement 2 is rotated.And the rotating shaft 24 of the sector gear of movement 2 just drives contact operating axis 16 when rotating and regulating part 141,142,143 rotates, and the rotation of regulating part 141,142,143 is the direct closed and disconnected of driving microswitch 91,92,93 just.Be SF6 gas when leaking gas to a certain degree, corresponding microswitch 91,92,93 contacts just are switched on or switched off, and send corresponding signal (reporting to the police or locking), reach monitor and equipment such as control electric switch in SF
6Gas density makes the electrical equipment trouble free service.If its density value has raise, force value also raises accordingly, is elevated to a certain degree, and C shape pipe 6 also produces accordingly to top offset, by the effect of temperature compensating element 7 and connecting link 15, makes the rotating shaft 24 of the sector gear of movement 2 that counter-rotation take place.This moment just drives contact operating axis 16 and counter-rotation also takes place regulating part 141,142,143, and corresponding microswitch 91,92,93 contacts are just disconnected or connection, and signal (reporting to the police or locking) is just removed.
In sum, vibration pointer type SF of the present utility model
6Gas density controller is owing to the two ends with contact operating axis 16 are connected on the movement 2, make contact operating axis 16 that good location and position-limiting action arranged, and then make regulating part 141,142,143 that good location and position-limiting action just arranged, when microswitch 91,92,93 divide-shut brakes produce vibration, can prevent that regulating part 141,142,143 from blocking or breaking away from the phenomenon of microswitch 91,92,93, misoperation can not take place, assurance system reliably working has improved this pointer SF greatly
6The resistance to shock of gas density controller and precision property are a kind of genuine vibration resistance pointer-type SF
6Gas density controller.Have the advantage of not being afraid of vibration, can not fill silicone oil, overcome the leakage of oil problem fully, can be applied in SF well
6On the electrical equipment.
This product can also take to increase the width of temperature compensating element 7 and C shape pipe 6, make its acting force become big, just can prevent that the beat of pointer is excessive, and then make regulating part 141,142,143 can not block or break away from the phenomenon of microswitch 91,92,93, the misoperation phenomenon can not take place, thereby can improve the resistance to shock and the reliability of controller greatly yet.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in claims scope of the present utility model variation, the modification of the above embodiment.Form as the contact operating axis can be versatile and flexible.
Claims (9)
1, a kind of vibration pointer type SF
6Gas density controller comprises SF
6The watchcase of gas density controller, be arranged on the pedestal in this watchcase, C shape pipe, temperature compensating element, movement, some microswitches, with corresponding regulating part of microswitch and contact operating axis, described movement comprises the movement train wheel bridge, the movement middle clamp plate that be arranged in parallel with the movement train wheel bridge, the sector gear that is connected across the shaft gear between movement train wheel bridge and the movement middle clamp plate rotationally and is connected with a joggle with this shaft gear, it is characterized in that: an end of described contact operating axis is connected in the rotating shaft of sector gear of movement and with the rotating shaft of this sector gear and rotates, radially spaced apart along its length being provided with and the corresponding threaded perforations of regulating part on this contact operating axis, described each regulating part is plugged in the threaded perforations and its end is resisted against on the motion arm of microswitch.
2, vibration pointer type SF as claimed in claim 1
6Gas density controller, it is characterized in that: described movement also comprises the movement lower plate that be arranged in parallel with the movement middle clamp plate, one end of described contact operating axis is connected in the rotating shaft of sector gear, the other end is rotatably connected on the movement lower plate, and described some regulating parts are located on the contact operating axis between movement middle clamp plate and the movement lower plate.
3, vibration pointer type SF as claimed in claim 1 or 2
6Gas density controller, it is characterized in that: be provided with the hole to adjustment part between the rotating shaft of described sector gear and the contact operating axis, when the threaded perforations direction of contact operating axis is adjusted to correct position, described hole joins the rotating shaft of sector gear and this contact operating axis together to adjustment part, so that described regulating part is fixed on the position of contact operating axis proper orientation.
4, vibration pointer type SF as claimed in claim 3
6Gas density controller, it is characterized in that: described hole is ended a screw to adjustment part by the bulge loop of the rotating shaft junction that is located at contact operating axis and sector gear and and is constituted, the diameter coupling of the internal diameter of this bulge loop and the rotating shaft of sector gear, and on its outer peripheral face, radially offer one and end a screw, when the threaded perforations direction on the contact operating axis is adjusted to correct position, with the rotating shaft sleeve of sector gear in this bulge loop, only be connected in the screw with ending a screw threads again, the rotating shaft of contact operating axis and sector gear is fixedlyed connected.
5, vibration pointer type SF as claimed in claim 1
6Gas density controller, it is characterized in that: the rotating shaft extension that described contact operating axis is a sector gear, the rotating shaft of this sector gear can be connected across respectively on movement train wheel bridge, movement middle clamp plate, movement lower plate or movement train wheel bridge, movement middle clamp plate or movement train wheel bridge, the movement lower plate of movement.
6, vibration pointer type SF as claimed in claim 1
6Gas density controller is characterized in that: described regulating part is a set screw, and regulating part is provided with locking member, and this locking member is a set nut.
7, vibration pointer type SF as claimed in claim 1
6Gas density controller is characterized in that: the width of described temperature compensating element is 5.5～18mm.
8, vibration pointer type SF as claimed in claim 1
6Gas density controller is characterized in that: described density controller comprises that also one is located at the chassis of watchcase bottom, and is fixedly connected by several vibration dampers between this chassis and the watchcase.
9, vibration pointer type SF as claimed in claim 1
6Gas density controller is characterized in that, the width of described C shape pipe is 20～40mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201542680U CN201327594Y (en) | 2008-10-21 | 2008-10-21 | Anti-vibration pointer type SF* gas density controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201542680U CN201327594Y (en) | 2008-10-21 | 2008-10-21 | Anti-vibration pointer type SF* gas density controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201327594Y true CN201327594Y (en) | 2009-10-14 |
Family
ID=41179561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201542680U Expired - Fee Related CN201327594Y (en) | 2008-10-21 | 2008-10-21 | Anti-vibration pointer type SF* gas density controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201327594Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387891B (en) * | 2008-10-21 | 2013-01-30 | 上海卓电电气有限公司 | Vibration resistant pointer type SF6 gas density controller |
| CN110850278A (en) * | 2019-09-04 | 2020-02-28 | 上海卓电电气有限公司 | Electromechanical integrated gas density relay |
-
2008
- 2008-10-21 CN CNU2008201542680U patent/CN201327594Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101387891B (en) * | 2008-10-21 | 2013-01-30 | 上海卓电电气有限公司 | Vibration resistant pointer type SF6 gas density controller |
| CN110850278A (en) * | 2019-09-04 | 2020-02-28 | 上海卓电电气有限公司 | Electromechanical integrated gas density relay |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091014 Termination date: 20121021 |