CN202749252U - Fast switch mechanism for on-load tap-changer - Google Patents

Abstract

The utility model relates to a fast switch mechanism for an on-load tap-changer. The fast switch mechanism comprises a fast switch mechanism shell, a plurality of moving contacts, an eccentric wheel rotatably arranged on the fast switch mechanism shell and connected with a transmission oscillating bar, a fixing sleeve fixedly arranged on the fast switch mechanism shell, and a middle rod rotatably connected to a rotation shaft on the fixing sleeve and eccentrically and fixedly arranged on the rotation shaft, wherein the oscillating bar is arranged on an outer wall of the eccentric wheel; a spring fixing column A is vertically arranged on an outer end of the oscillating bar; a spring fixing column B is vertically arranged on an end of the middle rod, near a rotation center; and an energy storage spring is fixedly connected between the spring fixing column A and the spring fixing column B. Due to the adoption of a connecting rod device, the mechanical structure has high reliability and a long service life. The reliability and the accuracy of the fast switch mechanism for the on-load tap-changer are ensured.

Description

A kind of on load tap changer quick switching mechanism

Technical field

The utility model relates to a kind of electric component, is specifically related to a kind of quick switching mechanism on load tap changer.

Background technology

Along with the fast development of intelligent grid, on-load tap-changing transformer is used in electrical network and is increased, and the on load tap changer regulating frequency is than greatly improving in the past, and the fault of on load tap changer is also increasing simultaneously.

On load tap changer is comprised of tap selector, diverter switch and motor drive mechanism, and its performance comprises electric property and two aspects of mechanical performance.Electric property mainly refers to contact resistance, when contact resistance increases, can cause that contact is overheated, even scaling loss.Mechanical performance refers to sequence of movement and the time coordination of the parts such as tap selector and diverter switch in the on load tap changer operating process, and whether exist jam and contact to switch in the handoff procedure not in place etc.The fault mode of on load tap changer has multiple, specifically comprise: drive shafts fracture, bad or the insulating support rod distortion of tap selector contact Contact, the malfunctioning tripping that causes of operating mechanism and slide piece phenomenon, limit switch is malfunctioning, hysteresis is refused to cut, ends or moved to diverter switch, and inner retainer is loosening and come off, and internal leak etc.Wherein, because of the quick switching mechanism clamping stagnation or switch and not in placely cause the on load tap changer scaling loss, so that the transformer phenomenon of burning, in electrical network, belong to modal fault.

Summary of the invention

The utility model provides a kind of reliability high in order to overcome the deficiency of above technology, and moving contact moves the on load tap changer quick switching mechanism of smooth and easy accurate positioning.

The technical scheme that its technical problem that overcomes the utility model adopts is:

This on load tap changer quick switching mechanism, comprise: the quick switching mechanism housing, several moving contacts, also comprise and rotatably be installed on eccentric wheel on the quick switching mechanism housing and that link to each other with the transmission fork, be fixedly installed in the fixed cover on the quick switching mechanism housing, be rotationally connected with the rotating shaft on the fixed cover and be eccentric shape and be fixed in intermediate bar in the rotating shaft, on the described eccentric wheel outer wall fork is installed, the fork outer end vertically is provided with spring fixed column A, described intermediate bar vertically be provided with spring fixed column B with near-end center of rotation, be fixedly connected with energy-stored spring between spring fixed column A and the spring fixed column B.

Be provided with identical with moving contact quantity on the above-mentioned quick switching mechanism housing and along the equally distributed chute of diametric(al), described moving contact slidably is installed in the chute.

The ratchet A and the ratchet B that also comprise the far-end restriction intermediate bar rotation that can prop up intermediate bar, described ratchet A and ratchet B are in the shape of the letter V by bearing pin and are rotatably connected, described bearing pin is fixed on the quick switching mechanism housing, the overstretching spring is connected between ratchet A and the ratchet B, is equipped with on the described eccentric wheel for can push the ratchet A and the ratchet B that prop up intermediate bar aside when fork swings to certain position to make intermediate bar can realize the shifting block of fanning ring-type that is that swings under the energy-stored spring effect.

The bottom, outer end of above-mentioned ratchet A is equipped with rotating runner A, and the bottom, outer end of ratchet B is equipped with rotating runner B, and described runner A and runner B are positioned on the same level height with shifting block.

The beneficial effects of the utility model are: when transmission fork band movable eccentric wheel rotates owing to be installed between fork on the deflection wheel and the intermediate bar and connect by energy-stored spring, so and the spring fixed column B that is arranged on the intermediate bar is eccentric shape when eccentric wheel drives the fork rotation, because the pulling force of energy-stored spring then can spur intermediate bar and turn to corresponding position, realize commutation thereby realize driving moving contact.Since adopt linkage, so the mechanical structure reliability is high, long service life.Reliability and the accuracy of on load tap changer quick switching mechanism have been guaranteed.

Description of drawings

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

Fig. 2 is eccentric wheel of the present utility model structural representation when being rotated counterclockwise 90 °;

Fig. 3 is the utility model intermediate bar present position structural representation when eccentric wheel is rotated counterclockwise 90 °;

Fig. 4 be among Fig. 1 A-A to generalized section;

Fig. 5 be among Fig. 2 B-B to generalized section;

Among the figure, 1. quick switching mechanism housing 2. chutes 3. moving contacts 4. energy-stored springs 5. spring fixed column A 6. intermediate bars 7. ratchet A 8. extension springs 9. bearing pins 10. ratchet B 11. eccentric wheels 12. spring fixed column B 13. forks 14. shifting blocks 15. fixed covers 16. rotating shafts 17. runner A 18. runner B.

Embodiment

Be described further below in conjunction with accompanying drawing 1,2 pairs of the utility model of accompanying drawing.

This on load tap changer quick mechanism, comprise: quick switching mechanism housing 1, several moving contacts 3, also comprise and rotatably be installed on eccentric wheel 11 on the quick switching mechanism housing 1 and that link to each other with the transmission fork, be fixedly installed in the fixed cover 15 on the quick switching mechanism housing 1, be rotationally connected with the rotating shaft 16 on the fixed cover 15 and be eccentric shape and be fixed in intermediate bar 6 in the rotating shaft 16, on described eccentric wheel 11 outer walls fork 13 is installed, fork 13 outer ends vertically are provided with spring fixed column A5, described intermediate bar 6 vertically be provided with spring fixed column B12 with near-end center of rotation, be fixedly connected with energy-stored spring 4 between spring fixed column A5 and the spring fixed column B12.When transmission fork band movable eccentric wheel 11 rotation owing to be installed between fork 13 on the deflection wheel 11 and the intermediate bar 6 and connect by energy-stored spring 4, so and the spring fixed column B12 that is arranged on the intermediate bar 6 is eccentric shape when eccentric wheel 11 drives fork 6 rotation, because the pulling force of energy-stored spring 4 then can spur intermediate bar 6 and turn to corresponding position, realize commutation thereby realize driving moving contact.Since adopt linkage, so the mechanical structure reliability is high, long service life.Guaranteed the stability of on load tap changer quick switching mechanism.

Be provided with identical with moving contact 3 quantity on the above-mentioned quick switching mechanism housing 1 and along the equally distributed chute 2 of diametric(al), described moving contact 3 slidably is installed in the chute 2.Moving contact 3 can move along chute 2, thereby has improved accuracy and the smoothness of moving contact in motion process, the useful life of having improved this on load tap changer quick switching mechanism.

The ratchet A7 and the ratchet B10 that also comprise far-end restriction intermediate bar 6 rotations that can prop up intermediate bar 6, described ratchet A7 and ratchet B10 are in the shape of the letter V by bearing pin 9 and are rotatably connected, described bearing pin 9 is fixed on the quick switching mechanism housing 1, overstretching spring 8 is connected between ratchet A7 and the ratchet B10, is equipped with on the described eccentric wheel 11 for can push the ratchet A7 and the ratchet B10 that prop up intermediate bar 6 aside when fork 13 swings to certain position to make intermediate bar 6 can realize the shifting block 14 of fanning ring-type that is that swings under energy-stored spring 4 effects.As shown in Figure 1, this moment, ratchet A7 withstood intermediate bar 6, and in fork 13 swing process, energy-stored spring 4 stretches, although exist spring tension this moment, intermediate bar 6 still can not move, and along with the increase of energy-stored spring 4 stretch ranges, spring tension also increases gradually.When shifting block 14 is being rotated counterclockwise along with eccentric wheel 11 in the process until touch ratchet A7, thereby be rotated further shifting block 14 and can push ratchet A7 open, thereby this moment intermediate bar 6 no longer include that ratchet A7 stops can be under the pulling force effect of energy-stored spring 4, realize the quick washing commutation, realized the effect of gunlock device, thereby moving contact 3 can be guaranteed quick and precisely at the volley.In like manner, when the commutation of another direction of needs, eccentric wheel 11 turns clockwise, thereby shifting block 14 can be pushed ratchet B10 open, thereby intermediate bar 6 no longer included ratchet B10 and stopped and can under the pulling force effect of energy-stored spring 4, realize the quick washing commutation this moment.

The bottom, outer end of above-mentioned ratchet A7 is equipped with rotating runner A17, and the bottom, outer end of ratchet B10 is equipped with rotating runner B18, and described runner A17 and runner B18 are positioned on the same level height with shifting block 14.Because there are runner A17 and runner B18, so shifting block 14 is at first touched rotating runner A17 and thereby runner B18 promotes ratchet A7 and ratchet B10 motion, thus can effectively protect the useful life of ratchet A7 and ratchet B10.

Claims (4)

1. on load tap changer quick switching mechanism, comprise: quick switching mechanism housing (1), several moving contacts (3), it is characterized in that: also comprise rotatably being installed on eccentric wheel (11) on the quick switching mechanism housing (1) and that link to each other with the transmission fork, be fixedly installed in the fixed cover (15) on the quick switching mechanism housing (1), be rotationally connected with the rotating shaft (16) on the fixed cover (15) and be eccentric shape and be fixed in intermediate bar (6) in the rotating shaft (16), on described eccentric wheel (11) outer wall fork (13) is installed, fork (13) outer end vertically is provided with spring fixed column A(5), described intermediate bar is (6) vertically to be provided with flexible fastening post B(12 with near-end center of rotation), flexible fastening post A(5) and flexible fastening post B(12) between be fixedly connected with energy-stored spring (4).

2. on load tap changer quick switching mechanism according to claim 1, it is characterized in that: be provided with identical with moving contact (3) quantity on the described quick switching mechanism housing (1) and along the equally distributed chute of diametric(al) (2), described moving contact (3) slidably is installed in the chute (2).

3. on load tap changer quick switching mechanism according to claim 1 and 2, it is characterized in that: comprise that also the far-end that can prop up intermediate bar (6) limits the ratchet A(7 that intermediate bar (6) rotates) and ratchet B(10), described ratchet A(7) and ratchet B(10) being in the shape of the letter V by bearing pin (9) is rotatably connected, described bearing pin (9) is fixed on the quick switching mechanism housing (1), overstretching spring (8) is connected in ratchet A(7) and ratchet B(10) between, be equipped with on the described eccentric wheel (11) for pushing the ratchet A(7 that props up intermediate bar (6) when swinging to certain position aside at fork (13)) and ratchet B(10) can make intermediate bar (6) under energy-stored spring (4) effect, can realize the shifting block (14) of fanning ring-type that is that swings.

4. on load tap changer quick switching mechanism according to claim 3, it is characterized in that: bottom, outer end described ratchet A(7) is equipped with rotating runner A(17), ratchet B(10) bottom, outer end is equipped with rotating runner B(18), described runner A(17) with runner B(18) same shifting block (14) is positioned on the same level height.

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