CN213519568U

CN213519568U - Air gap adjusting type arc suppression coil

Info

Publication number: CN213519568U
Application number: CN202023023599.0U
Authority: CN
Inventors: 陈恒云; 王佐恒; 李伟; 陈卓; 张远
Original assignee: Chongqing Xianglong Electric Co ltd
Current assignee: Chongqing Xianglong Electric Co ltd
Priority date: 2020-12-15
Filing date: 2020-12-15
Publication date: 2021-06-22
Anticipated expiration: 2030-12-15

Abstract

The utility model relates to the technical field of electric power transmission, and provides an air gap adjusting type arc suppression coil; the utility model discloses a transfer air gap formula arc suppression coil includes: the device comprises an installation frame, a fixed iron core, an inductance coil, a movable iron core and a lifting device, wherein the lifting device comprises a lifting mechanism, a speed reducing mechanism and a rotating driver; the lifting mechanism comprises a lifting frame, a hollow shaft, a large gear and a transmission screw rod, and the lifting machine is erected on the mounting frame; the hollow shaft is rotatably arranged on the lifting frame; the bull gear is mounted on the hollow shaft; the transmission screw rod is screwed on and penetrates the hollow shaft, and one end of the transmission screw rod is connected with the movable iron core; the speed reducing mechanism is in transmission connection with the rotating driver and the large gear, the rotating driver can enable the movable iron core to slide in or out the inductance coil through the transmission lead screw in a rotating mode, and the inductance value is adjusted by changing the air gap between the fixed iron core and the movable iron core. The sliding distance of the movable iron core is continuously changed, so that the inductance value can be continuously adjusted in a stepless manner.

Description

Air gap adjusting type arc suppression coil

Technical Field

The utility model relates to an electric power transmission technical field, concretely relates to transfer air gap formula arc suppression coil.

Background

A neutral point ungrounded mode is adopted in most of 3-66 KV system power grids in China, and single-phase grounding faults are one of the most common faults. When a single-phase earth fault occurs in a power grid, the current flowing through the fault point is large, and particularly when a large number of cables are used in the power grid, the current flowing through the fault point is generally about 30-150 amperes. Practice shows that when the single-phase earth fault capacitance current of the system is larger than 10A, a series of hazards are brought. In order to avoid harm, the method of connecting the neutral point with the arc suppression coil to be grounded is generally adopted for prevention.

The traditional arc suppression coil is generally adjusted by a manual no-load tap changer, and when the operation mode of a power grid or the parameters of the power grid change, the capacitance current is estimated manually, and then the arc suppression coil is removed from adjustment. The method has the defects of slow response adjustment, large error and the like. At present, the turn-adjusting arc suppression coil is mainly used in China, and although the problem of on-load adjustable inductance is solved, the inductance value is discrete and discontinuous due to the limitation of a coil tap and the gear of an on-load switch.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art existence, the utility model provides a transfer air gap formula arc suppression coil. The inductance value can be adjusted steplessly and continuously.

In order to achieve the above object, the utility model discloses a transfer air gap formula arc suppression coil includes: the device comprises an installation frame, a fixed iron core, an inductance coil, a movable iron core and a lifting device, wherein the lifting device comprises a lifting mechanism, a speed reducing mechanism and a rotation driver;

the lifting mechanism comprises a lifting frame, a hollow shaft, a large gear and a transmission screw rod, and the lifting machine is erected on the mounting frame; the hollow shaft is rotatably arranged on the lifting frame; the bull gear is mounted on the hollow shaft; the transmission screw rod is screwed on and penetrates the hollow shaft, and one end of the transmission screw rod is connected with the movable iron core;

the speed reducing mechanism is in transmission connection with the rotary driver and the large gear, and the rotary driver can rotate to enable the movable iron core to slide in or out the inductance coil through the transmission screw rod.

According to the technical scheme, when the arc coil is adjusted, the rotary driver is controlled to rotate, and the rotary driver drives the large gear to rotate the hollow shaft through the speed reducing mechanism; the transmission screw rod is connected with the movable iron core, and under the driving of the rotation of the hollow shaft, the transmission screw rod drives the movable iron core to slide in or out of the inductance coil to adjust the inductance value. The sliding distance of the movable iron core is continuously changed, so that the inductance value can be continuously adjusted in a stepless manner.

In one embodiment, the lifting mechanism further comprises two groups of connecting plates, the hollow shaft, the gearwheel and the transmission screw rod; the bull gears are meshed, the screw pitches of the transmission screw rods are the same, the rotation directions of the transmission screw rods are opposite, the two transmission screw rods are connected with the connecting plate, and the movable iron core is connected with the connecting plate.

The two transmission screw rods are connected through the connecting plate, the hollow shaft rotates to drive the transmission screw rods to slide, the transmission screw rods cannot rotate relative to the lifting frame, and the transmission screw rods do not need to be limited to rotate by other components or movable iron cores and inductance coils.

In one embodiment, the reduction mechanism comprises a reduction rack, a transmission shaft, a worm wheel, a worm and a pinion, the reduction rack is arranged on the mounting frame, the transmission shaft is rotatably arranged on the reduction rack, the worm wheel is arranged on the transmission shaft, the worm is arranged on the rotary driver and meshed with the worm wheel, and the pinion is arranged on the transmission shaft and meshed with the gearwheel.

After the rotary driver is subjected to primary speed reduction through the worm wheel and the worm, the large gear is driven by the small gear to reduce the speed, a large transmission ratio is formed between the rotary driver and the transmission screw rod, the movable iron core can be controlled to slide more accurately, and the adjustment precision of the inductance value is improved.

In one embodiment, the lifting device further comprises a pushing piece and two travel switches for controlling the rotary driver, the travel switches are arranged on the mounting frame at intervals along the axial direction of the transmission screw rod, the pushing piece is arranged at one end of the transmission screw rod, and one end of the pushing piece is arranged between the two travel switches.

The top collision piece moves along with the transmission screw rod, and the top collision piece pushes the stroke switch to limit the stroke range of the transmission screw rod. The adjustment range of the inductance value is controlled.

In one embodiment, the rotary drive is a variable frequency motor. The variable frequency motor can meet the operation requirements of frequent starting, frequent speed regulation and frequent braking, and the reliability of the air gap adjusting type arc suppression coil is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

Fig. 1 is a front view of an air gap adjusting arc suppression coil according to an embodiment of the present invention;

FIG. 2 is a front partial cross-sectional view of the lifting device shown in FIG. 1;

FIG. 3 is a left side partial cross-sectional view of the lifting device shown in FIG. 2;

FIG. 4 is a top view of the lifting device shown in FIG. 2;

fig. 5 is a front view of the movable iron core shown in fig. 1;

reference numerals:

11-mounting frame, 111-top plate, 12-fixed iron core, 13-inductance coil, 14-movable iron core, 2-lifting device, 21-speed reducing mechanism, 211-speed reducing frame, 212-transmission shaft, 213-worm wheel, 214-worm, 215-pinion, 22-lifting mechanism, 221-lifting frame, 222-hollow shaft, 223-transmission screw rod, 224-large gear, 225-connecting plate, 226-bearing, 23-rotary driver, 24-travel switch and 25-top collision piece.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience of description and simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.

Referring to fig. 1 to 5, the gap-adjusting arc suppression coil according to one embodiment includes a mounting frame 11, a fixed iron core 12, an inductance coil 13, a movable iron core 14, and a lifting device 2, where the lifting device 2 includes a lifting mechanism 22, a speed reduction mechanism 21, and a rotation driver 23. Which can steplessly and continuously adjust the inductance value.

In particular, the mounting frame 11 is used to mount and hold other components. The stator core 12 is fixedly installed at a lower portion of the mounting frame 11. The inductance coil 13 is sleeved on the fixed iron core 12. The movable iron core 14 is provided on the upper portion of the mounting frame 11, and the lower end of the movable iron core 14 protrudes into the inductor 13.

Referring to fig. 1 and 2, the lifting mechanism 22 includes a lifting frame 221, a hollow shaft 222, a large gear 224 and a driving screw 223. The lifting frame 221 is provided on the mounting frame 11. In particular, the top of the mounting frame 11 is provided with a top plate 111 for mounting the lifting device 2. The lift frame 221 is mounted on the top plate 111. The hollow shaft 222 is rotatably mounted on the lift frame 221. The hollow shaft 222 is vertically disposed on the lift frame 221. The large gear 224 is mounted on the hollow shaft 222. It will be appreciated that the hollow shaft 222 is required to limit axial play due to the gearing requirements. In one embodiment, the hollow shaft 222 and the lift frame 221 are provided with bearings 226 to support the hollow shaft 222 for rotation and to limit play of the hollow shaft 222. In one embodiment, the upper end of the hollow shaft 222 extends out of the elevator frame 221, and the large gear 224 is mounted on the end of the hollow shaft 222 extending out of the elevator frame 221. The driving screw 223 is threaded through the hollow shaft 222. One end of the drive screw 223 is connected to the movable iron core 14. The lower end of the drive screw 223 is connected to the movable iron core 14. The inner hole of the hollow shaft 222 is provided with a screw thread matched with the transmission screw rod 223. The transmission screw 223 and the hollow shaft 222 rotate relatively, so that the hollow shaft 222 and the transmission screw 223 relatively move in the axial direction of the transmission screw 223. Since the hollow shaft 222 is defined on the lift frame 221, the driving screw 223 rotates relative to the hollow shaft 222 so that the driving screw 223 can move up and down.

In one embodiment, the lifting mechanism 22 further includes a connecting plate 225. The hollow shaft 222, the large gear 224 and the transmission screw 223 are two groups. The bull gears 224 mesh. The transmission screw rods 223 have the same thread pitch and opposite rotation directions. The two driving screws 223 are connected with the connecting plate 225. The movable iron core 14 is connected to the connection plate 225. Specifically, two sets of hollow shafts 222 are disposed side by side on the lift frame 221. The two sets of large gears 224 are engaged to provide the hollow shafts 222 with opposite rotational directions. The two transmission screw rods 223 are respectively arranged on the two hollow shafts 222, the screw pitches of the two transmission screw rods 223 are the same, and the rotation directions are opposite, and the two transmission screw rods 223 can synchronously ascend or descend when the hollow shafts 222 rotate. The lower ends of the two driving screws 223 are connected to the top surface of the connecting plate 225, and the bottom surface of the connecting plate 225 is connected to the movable iron core 14. The two transmission screw rods 223 are connected through the connecting plate 225, the hollow shaft 222 rotates to drive the transmission screw rods 223 to slide, the transmission screw rods 223 cannot rotate relative to the lifting frame 221, and the transmission screw rods 223 do not need to be limited to rotate by other components or the movable iron core 14 and the inductance coil 13.

Referring to fig. 3 and 4, the speed reducing mechanism 21 is drivingly connected to the rotary driver 23 and the large gear 224. The rotation of the rotary actuator 23 enables the movable iron core 14 to slide in or out of the inductor winding 13 by means of the driving screw 223. Specifically, the reduction mechanism 21 includes a reduction frame 211, a transmission shaft 212, a worm wheel 213, a worm 214, and a pinion 215. The reduction housing 211 is provided on the mounting frame 11. The decelerating frame 211 may be a separate frame or may be integrated with the elevating frame 221. The transmission shaft 212 is rotatably mounted on the reduction frame 211, and the worm wheel 213 is provided on the transmission shaft 212. The drive shaft 212 is disposed in parallel with the hollow shaft 222. The worm wheel 213 is disposed at the middle of the transmission shaft 212. The worm 214 is mounted on the rotation driver 23 and meshes with the worm wheel 213. The worm 214 is mounted fast on the output shaft of the rotary drive 23. The pinion gear 215 is mounted on the drive shaft 212 and meshes with the bull gear 224. One end of the transmission shaft 212 protrudes out of the reduction housing 211, and the pinion gear 215 is mounted on the end of the transmission shaft 212 protruding out of the reduction housing 211. The pinion gear 215 engages the bull gear 224 and drives the bull gear 224 in rotation. The hollow shaft 222 drives the transmission screw 223 to ascend or descend so as to adjust the air gap between the movable iron core 14 and the fixed iron core 12 to change the inductance. After the rotation driver 23 is decelerated for one stage through the worm wheel 213 and the worm 214, the large gear 224 is driven by the small gear 215 to decelerate, and a large transmission ratio is formed between the rotation driver 23 and the transmission screw rod 223, so that the sliding of the movable iron core 14 can be controlled more accurately, and the adjustment precision of the inductance value is improved. The rotary drive 23 provides a rotary output, which may be an electric or hydraulic motor. In one embodiment, the rotary drive 23 is a variable frequency motor. The variable frequency motor can meet the operation requirements of frequent starting, frequent speed regulation and frequent braking, and the safety and reliability of the air gap type arc suppression coil are improved.

In one embodiment, the lifting device 2 also comprises a striker 25 and two travel switches 24 for controlling the rotary drive 23. The stroke switches 24 are provided at intervals in the axial direction of the drive screw 223 on the mounting frame 11. The bumping member 25 is installed on one end of the driving screw 223, and one end of the bumping member 25 is disposed between the two travel switches 24. Specifically, the abutting member 25 is mounted on the upper end of the driving screw 223 and moves up and down along with the driving screw 223. When the abutting member 25 abuts against the travel switch 24, the power supply state of the rotary actuator 23 is changed, and the rotary actuator 23 is stopped or rotated in the reverse direction. The abutting member 25 abuts against the stroke switch 24 to limit the stroke range of the transmission screw 223. The adjustment range of the inductance value is controlled.

According to the above technical solution, when the arc coil adjustment is performed, the rotation driver 23 is controlled to rotate, and the rotation driver 23 drives the large gear 224 to rotate the hollow shaft 222 through the speed reducing mechanism 21. The transmission screw 223 is connected with the movable iron core 14, and under the driving of the rotation of the hollow shaft 222, the transmission screw 223 drives the movable iron core 14 to slide in or out of the inductance coil 13, so as to change the air gap between the fixed iron core 12 and the movable iron core 14 and adjust the inductance value. The sliding distance of the movable iron core 14 is continuously changed, so that the inductance value can be continuously and steplessly adjusted. The utility model discloses a transfer air gap formula arc suppression coil still has higher security, reliability and stability, and it is high to adjust the precision.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. An air gap adjusting type arc suppression coil comprises an installation frame, a fixed iron core, an inductance coil, a movable iron core and a lifting device, and is characterized in that the lifting device comprises a lifting mechanism, a speed reducing mechanism and a rotation driver;

2. The gap-adjusting arc suppression coil as set forth in claim 1, wherein said lifting mechanism further comprises a connecting plate, and said hollow shaft, said bull gear and said drive screw are in two sets; the bull gears are meshed, the screw pitches of the transmission screw rods are the same, the rotation directions of the transmission screw rods are opposite, the two transmission screw rods are connected with the connecting plate, and the movable iron core is connected with the connecting plate.

3. An arc suppressing coil as set forth in claim 1 or 2 wherein said speed reducing mechanism comprises a speed reducing frame, a transmission shaft mounted on said mounting frame, a worm wheel rotatably mounted on said speed reducing frame, a worm gear mounted on said transmission shaft, said worm mounted on said rotary drive and meshing with said worm wheel, and a pinion mounted on said transmission shaft and meshing with said gearwheel.

4. An air gap adjusting type arc suppressing coil as set forth in claim 1 or 2, wherein said lifting means further comprises a striking member and two stroke switches for controlling said rotary actuator, said stroke switches being provided on said mounting frame at intervals in an axial direction of said drive screw, said striking member being mounted on one end of said drive screw, one end of said striking member being provided between said two stroke switches.

5. A gap-setting arc suppression coil as claimed in claim 1 or 2, wherein said rotary drive is a variable frequency motor.