CN219873117U - Disc-shaped vacuum on-load tap-changer - Google Patents

Abstract

The utility model relates to a disc-shaped vacuum on-load tap-changer, which comprises a driving mechanism, an actuating mechanism and an insulating mounting base; the driving mechanism comprises a driving motor, and a motor gear is arranged at the lower end of a motor shaft of the driving motor; an actuator turntable and a moving contact assembly; the insulating mounting base is provided with a fixed contact group, the fixed contact group comprises a plurality of fixed contacts, and the actuating mechanism also comprises a transition gear, a shifting fork gear and a cam shifting fork; the rotary disc comprises a cam disc and an execution sheave integrally formed at the upper end of the cam disc; the transition gear and the shifting fork gear are arranged above the fixed plate, the transition gear is meshed with the motor gear, and the shifting fork gear is meshed with the transition gear; the cam shifting fork is fixed on the shifting fork gear, is positioned below the fixed plate and is matched with the execution grooved pulley for transmission; according to the scheme, the actuating mechanism adopts the integrated parts of the actuating grooved wheels and the cam disc, so that the number of parts of the actuating mechanism is reduced, and the switch is more reliable to operate.

Description

Disc-shaped vacuum on-load tap-changer

Technical Field

The utility model relates to the technical field of electric power products, in particular to a disc-shaped vacuum on-load tap-changer.

Background

The distribution transformer is the last stage of the power supply network, is applied to various fields of national folk life, and is distributed over various corners of urban and rural areas, and the quantity is huge. The active distribution transformer is in a non-excitation voltage regulation mode, the power supply is required to be cut off during voltage regulation, then the non-excitation voltage regulation switch is manually regulated, and power transmission is restored after the regulation is completed. The power failure is needed to regulate the voltage, and the voltage cannot be regulated in time, so that the distribution transformer is equal to the voltage regulation measure in the actual power supply network, the qualification rate of the power supply voltage is low, the stability is poor, the electric equipment is abnormally operated, and the loss of the distribution transformer and the electric equipment is increased.

With the continuous improvement and development of social economy and power grids, the requirement on voltage quality is higher and higher, and the on-load voltage regulation mode can automatically regulate the output voltage of the voltage regulating transformer in a charged manner according to the change of the power load, so that the voltage can be regulated timely, the voltage stabilizing effect is achieved, and the operation and maintenance problems of inherent voltage regulation defect of no-excitation voltage regulation, power failure and the like caused by manual voltage regulation are overcome; the on-load voltage regulation is fast, has adjustability at any time, can be manually operated or electrically operated, can realize remote control electrically operated or automatic voltage regulation through the on-load voltage regulation controller, and is convenient for automatic management. Therefore, the requirements on the reliability of the on-load voltage regulating distribution transformer are higher and higher, and the requirements on the reliability, miniaturization, voltage regulating gear number and the like of the on-load voltage regulating switch are also increased continuously to meet the requirements of different types of distribution transformers.

At present, the three-dimensional coiled iron core on-load voltage-regulating distribution transformer is not popularized and applied, and the existing cylinder-type or strip-type vacuum or non-vacuum tapping switch with excellent performance and no maintenance is only limited to be applied to the planar arrangement iron core voltage-regulating distribution transformer. If the transformer is used on a three-dimensional coiled core distribution transformer, the occupied space is large, the transformer cannot meet the special installation requirement of the three-dimensional coiled core distribution transformer, and the economical advantage of the transformer cannot be fully exerted.

One chinese patent of the disclosure CN215896191U relates to a miniaturized on-load voltage regulating switch and on-load voltage regulating distribution transformer, which comprises a driving mechanism, a metal fixing plate, a selector switch assembly, a transition element, an insulating mounting main board, and an insulating mounting bracket, wherein the three-phase selector switch assembly, the selector switch assembly and the transition element are mounted on the insulating mounting main board in a trisection manner.

The miniaturized on-load voltage regulating switch in the scheme has adaptability to most distribution transformers structurally, frequent voltage adjustment under the condition of on-load can be realized, power supply voltage is stabilized, but the internal parts are more, the die opening manufacturing cost is higher, and the adjustment precision and stability can be relatively reduced under the condition that most parts are matched, so that the stable operation and accurate regulation and control of the switch are not facilitated.

Disclosure of Invention

In order to solve the problems, the utility model aims to provide a disc-shaped vacuum on-load tap-changer, wherein an actuating mechanism adopts an integrated part of an actuating sheave and a cam disc, so that the number of parts of the actuating mechanism is reduced, the manufacturing precision is ensured, the internal structure of the switch is simplified, and the operation of the switch is more reliable.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

a disk-shaped vacuum on-load tap-changer comprises a driving mechanism, an executing mechanism and an insulating installation base;

the driving mechanism comprises a driving motor, and a motor gear is arranged at the lower end of a motor shaft of the driving motor; the actuating mechanism comprises a fixed plate, a rotary table and a moving contact assembly, wherein the rotary table and the moving contact assembly are arranged below the fixed plate; the movable contact assembly comprises a movable contact, a vacuum tube and a transition resistor; the insulating installation base is provided with a fixed contact group, and the fixed contact group comprises a plurality of fixed contacts, and is characterized in that:

the actuating mechanism further comprises a transition gear, a shifting fork gear and a cam shifting fork; the rotary disc comprises a cam disc and an execution sheave integrally formed at the upper end of the cam disc; the transition gear and the shifting fork gear are arranged above the fixed plate, the transition gear is meshed with the motor gear, and the shifting fork gear is meshed with the transition gear; the cam shifting fork is fixed on the shifting fork gear, is positioned below the fixed plate and is in matched transmission with the execution grooved pulley;

the driving motor drives the motor gear to rotate, the motor gear rotates to drive the transition gear and the shifting fork gear to rotate, and the shifting fork gear rotates to drive the cam shifting fork to rotate; the cam shifting fork rotates and drives the whole rotary table to rotate by a fixed angle through shifting the execution grooved pulley, in the process, the cam disc rotates to drive the corresponding vacuum tube to conduct on-off action according to a set time sequence, meanwhile, the moving contact rotates along with the cam disc, and the vacuum tube is matched to switch from one fixed contact to an adjacent fixed contact according to the set time sequence, so that the conversion of one-time voltage-regulating gear is completed.

Preferably, the movable contact assembly has three groups; each group of moving contact assemblies comprises two moving contacts, two vacuum tubes, a transition resistor, a moving contact frame, a fixed seat, a transition resistor, two levers and two lead-out copper rings;

the movable contact frame is fixed on the bottom surface of the cam disc, and the two movable contacts are arranged on the movable contact frame; the two vacuum tubes are fixed on the bottom surface of the insulating mounting base through the fixing base, the lever is arranged on the insulating mounting base in a penetrating mode, one end of the lever is matched with the cam disc, and the other end of the lever is movably connected with the contact of the vacuum tube; the transition resistor is fixed on the bottom surface of the insulating installation base;

the two lead-out copper rings are embedded at the upper end of the insulating mounting base, the two lead-out copper rings comprise an inner lead-out copper ring and an outer lead-out copper ring, the two moving contacts comprise a short moving contact and a long moving contact, the outer end of the short moving contact is pressed on the fixed contact, and the inner end of the short moving contact is pressed on the outer lead-out copper ring; the outer end of the long moving contact is pressed on the fixed contact, and the inner end of the long moving contact is pressed on the inner lead-out copper ring.

Preferably, the short moving contact is electrically connected with a vacuum tube through an outer lead-out copper ring, and the long moving contact is electrically connected with the transition resistor through an inner lead-out copper ring; the fixing seat is electrically connected with the two vacuum tubes, and the transition resistor is electrically connected with one of the vacuum tubes.

Preferably, a cam is circumferentially arranged at the edge of the lower end of the cam disc, the lever comprises a driving arm, a driven arm and a connecting shaft for connecting the driving arm and the driven arm, the connecting shaft is arranged on the insulating mounting base in a penetrating manner, the driving arm is positioned above the insulating mounting base, one end of the driving arm is fixedly connected with the connecting shaft, and the other end of the driving arm is positioned with an abutting block matched with the cam; the driven arm is positioned below the insulating mounting base, one end of the driven arm is fixedly connected with the connecting shaft, and the other end of the driven arm is connected with the contact of the vacuum tube; the cam disc rotates to enable the cam to push the abutting block to enable the driving arm to swing, and the driven arm is driven to swing to drive the vacuum tube to act.

Preferably, the vacuum tubes in the three groups of moving contact assemblies are circumferentially arranged along the center of the bottom surface of the insulating mounting base.

Preferably, the insulating mounting base is provided with a plurality of mounting brackets, and the mounting brackets are fixedly connected with the fixing plate through screws; the mounting bracket and the insulating mounting base are integrally formed.

Preferably, an insulating convex ring is arranged in the middle of the insulating mounting base, a plurality of stand columns are fixed on the insulating convex ring, and the upper parts of the stand columns penetrate through the turntable and are fixedly connected with the fixing plate.

Preferably, a plurality of groups of roller groups are circumferentially arranged at the lower end of the fixed plate, each roller group comprises a roller bracket fixed at the lower end of the fixed plate and rollers arranged on the roller brackets, and the rollers are abutted to the upper ends of the cam plates.

Preferably, a central hole is formed in the middle of the turntable, a fixed shaft penetrates through the middle of the fixed plate, the fixed shaft stretches into the central hole, the lower end of the fixed shaft is fixed on the insulating mounting base, and a plurality of first bearings sleeved on the fixed shaft are arranged in the central hole; the cam shifting fork is fixedly connected with the shifting fork gear through a key, two assembly holes are formed in the fixing plate, corresponding to the transition gear and the shifting fork gear, a second bearing is arranged in the two assembly holes, a short shaft is fixedly arranged on the transition gear in a penetrating mode, and the short shaft and the key are arranged on the second bearing in a penetrating mode.

Preferably, the driving motor is positioned on the fixed plate through the mounting seat; the driving mechanism further comprises a gear display assembly, the gear display assembly comprises a gear shifting fork fixed on a motor shaft, a positioning bracket arranged on a mounting seat, a positioning pin penetrating through the positioning bracket, a gear grooved wheel arranged on the positioning pin and a gear circuit board, and the gear shifting fork can shift the gear grooved wheel to display the state of the tapping switch;

the motor gear is arranged on the gear shifting fork and extends out of the lower end of the mounting seat;

the driving motor is a miniature brushless direct current gear motor, a protective cover is sleeved on the outer side of the driving motor, the lower end of the protective cover is fixedly connected with a motor mounting frame, an assembly groove for accommodating the gear display assembly is formed at the upper end of the mounting seat, and the motor mounting frame is fixedly covered on the assembly groove.

The utility model adopts the technical scheme and has the following beneficial effects:

1. the actuating mechanism of the switch adopts the integrated parts of the actuating grooved wheel and the cam disc, so that the number of the parts of the actuating mechanism is greatly reduced, the operation precision is improved, and the integrated parts are pressed by a die and are molded at one time, thereby ensuring the manufacturing precision.

2. Through the cooperation of motor gear, transition gear and shift fork gear, reduce actuating mechanism's space occupancy, miniaturized switch inner structure makes the switch operation more stable.

3. The insulating installation base and the installing support integrated into one piece, and installing support and fixed plate fixed connection are fixed with many stands between fixed plate and the insulating installation base for the wholeness is good between switch actuating mechanism and the insulating installation base, and the structure is more stable.

4. The high-voltage components such as the contact are arranged on the outer ring of the insulating mounting base, the ground potential components such as the support column and the fixed shaft are arranged on the inner ring, and the insulating convex ring is formed on the insulating mounting base between the two parts, so that the ground insulating performance of the switch is improved.

5. The setting of multiunit roller train not only can make fixed plate structure more stable to can be with the focus of the clamp force to the inboard removal, compress tightly the effect better, guarantee the butt effect of moving contact and fixed contact. And the roller group can not interfere with the insulating installation base, so that the assembly and disassembly are more convenient.

6. The plurality of vacuum tubes are circumferentially arranged on the bottom surface of the insulating installation base, so that the action space is larger, the arrangement is more reasonable, and the transition resistance is also convenient to set.

7. The arrangement of the lead-out copper ring ensures effective electric connection between the movable contact and the vacuum tube as well as between the movable contact and the resistor.

Drawings

Fig. 1 is a schematic perspective view of a disc-shaped vacuum on-load tap-changer.

Fig. 2 is a schematic perspective view of a driving mechanism.

Fig. 3 is a schematic perspective view of another view of the driving mechanism.

Fig. 4 is an assembly schematic diagram of a drive motor and a motor gear.

Fig. 5 is an exploded view of the gear display assembly.

Fig. 6 is a schematic perspective view of the mounting base.

Fig. 7 is a schematic perspective view of the protective cover.

Fig. 8 is an assembly schematic diagram of a fork gear and a transition gear.

Fig. 9 is an assembly schematic diagram of the movable contact and the turntable.

Fig. 10 is an exploded view of fig. 8.

Fig. 11 is an assembly schematic diagram of an insulative mounting base and a fixed contact set.

FIG. 12 is a schematic view of the assembly of a vacuum tube, lever, transition resistor and insulating mounting base.

Fig. 13 is an exploded view of fig. 11.

Fig. 14 is a schematic circuit diagram of a voltage regulation gear shift of a disc vacuum on-load tap changer.

Description of the embodiments

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

A disc-shaped vacuum on-load tap-changer as shown in fig. 1 comprises a driving mechanism 1, an actuating mechanism 2 and an insulating mounting base 3;

as shown in fig. 4, 8, 9 and 13, the driving mechanism 1 comprises a driving motor 11, and a motor gear 13 is arranged at the lower end of a motor shaft of the driving motor 11; the actuating mechanism 2 comprises a fixed plate 21, a rotary table 22 and a moving contact assembly 23, wherein the rotary table 22 and the moving contact assembly 23 are arranged below the fixed plate 21; the movable contact assembly 23 comprises a movable contact 231, a vacuum tube 33 and a transition resistor 32; the insulating mounting base 3 is provided with a fixed contact group 35, the fixed contact group 35 comprises a plurality of fixed contacts,

the actuator 2 shown in fig. 10 further comprises a transition gear 24, a fork gear 25 and a cam fork 26; the rotary table 22 includes a cam plate 221 and an actuating sheave 222 integrally formed at an upper end of the cam plate 221; the transition gear 24 and the shifting fork gear 25 are arranged above the fixed plate 21, the transition gear 24 is meshed with the motor gear 13, and the shifting fork gear 25 is meshed with the transition gear 24; the cam shifting fork 26 is fixed on the shifting fork gear 25, and the cam shifting fork 26 is positioned below the fixed plate 21 and is in matched transmission with the execution grooved pulley 222;

the driving motor 11 drives the motor gear 13 to rotate, the motor gear 13 rotates to drive the transition gear 24 and the shifting fork gear 25 to rotate, and the shifting fork gear 25 rotates to drive the cam shifting fork 26 to rotate; the cam shifting fork 26 rotates and rotates the whole rotary table 22 by a fixed angle through shifting the execution grooved pulley 222, in the process, the cam disc 221 rotates to drive the corresponding vacuum tube 33 to conduct on-off action according to a set time sequence, meanwhile, the moving contact 231 rotates along with the cam disc 221, and the vacuum tube 33 is matched with the cam disc to switch from one fixed contact to an adjacent fixed contact according to the set time sequence, so that the conversion of one-time voltage-regulating gear is completed.

In the above technical solution, the cam disc 221 and the actuating sheave 222 are integrated into the rotary disc 22, so that the number of parts of the actuating actuator is reduced, the operation precision is improved, and the integrated parts are pressed by a die and formed at one time, thereby ensuring the manufacturing precision. And further reduce the size of gear, through the setting of transition gear 24 and shift fork gear 25 and the rotation of motor gear 13 cooperation stirring carousel 22, reduce actuating mechanism's space occupation rate.

Here, the cam fork 26 is pressed against the lower end surface of the fixing plate 21, and has a shifting block and a locking ring capable of periodically shifting and locking the actuating sheave 222.

Further, the moving contact assembly 23 has three groups; each group of movable contact assemblies 23 comprises two movable contacts 231, two vacuum tubes 33, a transition resistor 32, a movable contact frame 232, a fixed seat 345, the transition resistor 32, two levers 34 and two lead-out copper rings;

the movable contact head frame 232 is fixed on the bottom surface of the cam disc 221, and the two movable contacts 231 are mounted on the movable contact head frame 232; the two vacuum tubes 33 are fixed on the bottom surface of the insulating mounting base 3 through a fixed seat 345, the lever 34 is arranged on the insulating mounting base 3 in a penetrating way, one end of the lever is matched with the cam disc 221, and the other end of the lever is movably connected with a contact of the vacuum tube 33; the transition resistor 32 is fixed on the bottom surface of the insulating mounting base 3;

as shown in fig. 13, two lead-out copper rings are embedded at the upper end of the insulation mounting base 3, the two lead-out copper rings comprise an inner lead-out copper ring 38.1 and an outer lead-out copper ring 38.2, the two moving contacts 231 comprise a short moving contact 231.1 and a long moving contact 232.2, the outer end of the short moving contact 231.1 is pressed on the fixed contact, and the inner end is pressed on the outer lead-out copper ring 38.2; the outer end of the long moving contact 232.2 is pressed on the fixed contact, and the inner end is pressed on the inner lead-out copper ring 38.1.

Here, fixed contacts 351, 352, 353, 354, 355 are shown which mate with the short moving contact 231.1 and the long moving contact 232.2.

Further, the short moving contact 231.1 is electrically connected with a vacuum tube 33 through an outer lead copper ring 38.2, and the long moving contact 232.2 is electrically connected with the transition resistor 32 through an inner lead copper ring 38.1; the fixing base 345 is electrically connected with two vacuum tubes 33, and the transition resistor 32 is electrically connected with one of the vacuum tubes 33.

Further, as shown in fig. 10, 12 and 13, a cam 2211 is circumferentially arranged at the edge of the lower end of the cam disc 221, the lever 34 includes a driving arm 341, a driven arm 342, and a connecting shaft 343 connecting the driving arm 341 and the driven arm 342, the connecting shaft 343 is arranged on the insulating mounting base 3 in a penetrating manner, the driving arm 341 is positioned above the insulating mounting base 3, one end of the driving arm 341 is fixedly connected with the connecting shaft 343, and the other end of the driving arm is positioned with an abutting block 344 matched with the cam 2211; the driven arm 342 is positioned below the insulating mounting base 3, one end of the driven arm is fixedly connected with the connecting shaft 343, and the other end of the driven arm is connected with the contact of the vacuum tube 33; the rotation of the cam disc 221 can make the cam 2211 push the abutting block 344 to swing the driving arm 341, and drive the driven arm 342 to swing to drive the vacuum tube 33 to act.

Further, the connection shaft 343 is inserted into the protrusion 316 of the outer ring of the insulating mounting base 3, so as to ensure that the connection shaft does not interfere with the fixed contact.

Further, a plurality of clamping protrusions 317 are further distributed on the upper surface of the insulating mounting base 3, and can cooperate with the moving contacts 231 to maintain the relative stability of a group of moving contacts.

As shown in fig. 12, the vacuum tubes 33 in the three groups of moving contact assemblies 23 are circumferentially arranged along the bottom surface center of the insulative mounting base 3.

As shown in fig. 11, the insulating mounting base 3 is provided with a plurality of mounting brackets 36, and the plurality of mounting brackets 36 are fixedly connected with the fixing plate 21 through screws; the mounting bracket 36 is integrally formed with the insulating mounting base 3. An insulating convex ring 314 is arranged in the middle of the insulating mounting base 3, a plurality of upright posts 315 are fixed on the insulating convex ring 314, and the upper parts of the upright posts 315 penetrate through the turntable 22 and are fixedly connected with the fixed plate 21.

As shown in fig. 10, a plurality of groups of roller groups are circumferentially arranged at the lower end of the fixed plate 21, the roller groups comprise a roller bracket fixed at the lower end of the fixed plate 21 and a roller 27 mounted on the roller bracket, and the roller 27 is abutted against the upper end of the cam plate 221. In this technical scheme, the setting of multiunit roller train not only can make fixed plate 21 structure more stable to can be with the focus of the clamp force to the inboard removal, compress tightly the effect better, guarantee the butt connection effect of moving contact and fixed contact. And the roller group can not interfere with the insulating installation base, so that the assembly and disassembly are more convenient.

Further, a central hole is formed in the middle of the turntable 22, a fixed shaft 28 is penetrated in the middle of the fixed plate 21, the fixed shaft 28 extends into the central hole, the lower end of the fixed shaft is fixed on the insulating mounting base 3, and a plurality of first bearings 29 sleeved on the fixed shaft 28 are arranged in the central hole; the cam shifting fork 26 is fixedly connected with the shifting fork gear 25 through a key, two assembly holes are formed in the fixed plate 21 corresponding to the transition gear 24 and the shifting fork gear 25, a second bearing 29.2 is arranged in the two assembly holes, a short shaft is fixedly arranged on the transition gear 24 in a penetrating mode, and the short shaft and the key are arranged on the second bearing 29.2 in a penetrating mode.

As shown in fig. 2 to 7, the driving motor 11 is positioned on the fixing plate 21 through the mounting seat 15; the driving mechanism 1 further comprises a gear display assembly, the gear display assembly comprises a gear shifting fork 12 fixed on a motor shaft, a positioning bracket 141 arranged on a mounting seat 15, a positioning pin 142 penetrating through the positioning bracket 141, a gear grooved wheel 143 arranged on the positioning pin 142 and a gear circuit board 144, and the gear shifting fork 12 can shift the gear grooved wheel 143 to display the state of the tapping switch;

the motor gear 13 is arranged on the gear shifting fork 12 and extends out of the lower end of the mounting seat 15;

the driving motor 11 is a miniature brushless direct current gear motor, a protective cover 16 is sleeved on the outer side of the driving motor 11, the lower end of the protective cover 16 is fixedly connected with a motor mounting frame 17, an assembly groove for accommodating the gear display assembly is formed in the upper end of the mounting seat 15, and the motor mounting frame 17 is fixedly covered on the assembly groove.

In addition, washers 145 are further provided on both sides of the upper end of the positioning bracket 141, so that the positioning bracket 141 is more tightly connected with the mounting seat 15.

The specific process of the switching of the pressure regulating gear is as follows:

the driving motor 11 drives the motor gear 13 to rotate, the motor gear 13 rotates to drive the transition gear 24 and the shifting fork gear 25 to rotate, the shifting fork gear 25 rotates to drive the cam shifting fork 26 to rotate, the cam shifting fork 26 rotates to drive the actuating sheave 222 to rotate the whole turntable 22, the turntable 22 drives the moving contacts 231.1, 231.2 and the levers 34.1 and 34.2 to act in a time sequence, the moving contacts 231.1 and 231.2 select one fixed contact of the corresponding fixed contact assemblies 35 (fixed contacts 351, 352, 353, 354 and 355), specifically, the cam 2211 rotates to push the abutting block 344.1 to drive the driving arms 341.1 and 341.2 to act, the driving arms 341.1 and 341.2 drive the driven arms 342.1 and 342.2 to act through the connecting shafts 344.1 and 344.2 respectively, and the driven arms 342.1 and 342.2 drive the vacuum tubes 33.1 and 33.2 to act respectively, and the conversion of the pressure regulating gear is completed.

In this embodiment, the existing tap switch has a complex structure, high die sinking cost, and many execution steps, which is not beneficial to the switch to execute the conversion of the voltage-regulating gear. According to the scheme, the integral parts of the actuating sheaves and the cam disc are adopted in the actuating mechanism of the switch, so that the number of parts of the actuating mechanism is greatly reduced, the adjusting precision is relatively high, the integral parts are pressed by a die and are formed at one time, the manufacturing precision is ensured, and the manufacturing efficiency is greatly improved. Furthermore, through the cooperation of motor gear, transition gear and shift fork gear, reduce actuating mechanism's space occupancy, and reduced actuating mechanism's spare part quantity, simplified switch inner structure, make the switch operation more stable. In addition, insulating installation base and installing support integrated into one piece, installing support and fixed plate fixed connection are fixed with many stands between fixed plate and the insulating installation base for the wholeness is good between switch actuating mechanism and the insulating installation base, and the structure is more stable. Moreover, high-voltage components such as contacts are arranged on the outer ring of the insulating mounting base, ground potential components such as a support column and a fixed shaft are arranged on the inner ring, and an insulating convex ring is formed on the insulating mounting base between the two parts, so that the ground insulating performance of the switch is improved. And moreover, the setting of multiunit roller train not only can make fixed plate structure more stable to can be with the focus of the clamp force to the inboard removal, compress tightly the effect better, guarantee the butt effect of moving contact and fixed contact. And the roller group can not interfere with the insulating installation base, so that the assembly and disassembly are more convenient. The plurality of vacuum tubes are circumferentially arranged on the bottom surface of the insulating installation base, so that the action space is larger, the arrangement is more reasonable, and the transition resistance is also convenient to set.

It should be noted that, the insulating mounting base is further provided with an oil groove 37, which can increase the insulating performance between each group of moving contacts.

Fig. 14 shows 9 steps of a selective switching process of the disc-shaped vacuum on-load tap changer in a transformer, wherein N, N +1 in the drawing represents two adjacent coil taps of a voltage regulating winding, two arrows K1 and K2 represent two moving contacts 231.1 and 231.2 in a selective switch assembly, r represents a transition resistor 32, and V1 and V2 represent two vacuum tubes 33.1 and 33.2 in the switching switch assembly; timing of switching from N tap to n+1 tap of the voltage regulating winding:

step 1: the movable contacts K1 and K2 are connected with the N tap, and the vacuum tubes V1 and V2 are connected. The current flows through the vacuum tubes V1 and V2 from the N tap through the movable contacts K1 and K2;

step 2: the vacuum tube V2 is disconnected, the movable contact K2 is disconnected with the N tap, the movable contact K1 is still connected with the N tap, and current flows through the movable contact K1 and the vacuum tube V1 from the N tap;

step 3: the moving contact K1 is still connected with the N tap, the moving contact K2 is still disconnected with the N tap, and current flows through the moving contact K1 and the vacuum tube V1 from the N tap;

step 4: the movable contact K1 is still connected with the N tap, the movable contact K2 is switched from the N tap to the N+1 tap without current, and the current flows through the movable contact K1 and the vacuum tube V1 from the N tap;

step 5: the movable contact K1 is still communicated with the N tap, the vacuum tube V2 is closed, the movable contact K2 is communicated with the N+1 tap, current flows through the movable contact K1 and the vacuum tube V1 by the N tap, and current flows through the movable contact K2, the vacuum tube V2 and the transition resistor R by the N+1 tap, so that transient circulation is generated between the N tap and the N+1 tap;

step 6: the vacuum tube V1 is disconnected, the movable contact K1 is disconnected with the N tap, the movable contact K2 is still connected with the N+1 tap, and current flows through the movable contact K2, the vacuum tube V2 and the transition resistor R from the N+1 tap;

step 7: the movable contact K1 is still disconnected with the N tap, and current flows through the movable contact K2, the vacuum tube V2 and the transition resistor R from the N+1 tap;

step 8: the movable contact K2 is still connected with the N+1 tap, the movable contact K1 is switched from the N tap to the N+1 tap without current, and the current flows through the movable contact K2, the vacuum tube V2 and the transition resistor R from the N tap;

step 9: the movable contact K2 is still connected with the N+1 tap, the vacuum tube V1 is closed, the movable contact K1 is connected with the N+1 tap, and current flows through the vacuum tube V1 and V2 from the N+1 tap through the movable contacts K1 and K2.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations may be made in the above embodiments by those skilled in the art without departing from the spirit and principles of the utility model.

Claims (10)

1. A disk-shaped vacuum on-load tap-changer comprises a driving mechanism (1), an actuating mechanism (2) and an insulating mounting base (3);

the driving mechanism (1) comprises a driving motor (11), and a motor gear (13) is arranged at the lower end of a motor shaft of the driving motor (11); the actuating mechanism (2) comprises a fixed plate (21), a rotary table (22) arranged below the fixed plate (21) and a moving contact assembly (23); the movable contact assembly (23) comprises a movable contact (231), a vacuum tube (33) and a transition resistor (32); the insulation mounting base (3) is provided with a fixed contact group (35), and the fixed contact group (35) comprises a plurality of fixed contacts, and is characterized in that:

the actuating mechanism (2) further comprises a transition gear (24), a shifting fork gear (25) and a cam shifting fork (26); the rotary table (22) comprises a cam plate (221) and an execution grooved wheel (222) integrally formed at the upper end of the cam plate (221); the transition gear (24) and the shifting fork gear (25) are arranged above the fixed plate (21), the transition gear (24) is meshed with the motor gear (13), and the shifting fork gear (25) is meshed with the transition gear (24); the cam shifting fork (26) is fixed on the shifting fork gear (25), and the cam shifting fork (26) is positioned below the fixed plate (21) and is in matched transmission with the execution grooved wheel (222);

the driving motor (11) drives the motor gear (13) to rotate, the motor gear (13) rotates to drive the transition gear (24) and the shifting fork gear (25) to rotate, and the shifting fork gear (25) rotates to drive the cam shifting fork (26) to rotate; the cam shifting fork (26) rotates and drives the whole rotary table (22) to rotate by a fixed angle through shifting the execution grooved wheel (222), in the process, the cam plate (221) rotates to drive the corresponding vacuum tube (33) to conduct on-off action according to a set time sequence, meanwhile, the moving contact (231) rotates along with the cam plate (221), and the vacuum tube (33) is matched to switch from one fixed contact to an adjacent fixed contact according to the set time sequence, so that the conversion of one-time voltage-regulating gear is completed.

2. A disc vacuum on-load tap changer according to claim 1, wherein: the movable contact assembly (23) is provided with three groups; each group of moving contact assemblies (23) comprises two moving contacts (231), two vacuum tubes (33) and a transition resistor (32), and further comprises a moving contact frame (232), a fixed seat (345), two levers (34) and two lead-out copper rings;

the movable contact head frame (232) is fixed on the bottom surface of the cam disc (221), and the two movable contacts (231) are arranged on the movable contact head frame (232); the two vacuum tubes (33) are fixed on the bottom surface of the insulating installation base (3) through fixing seats (345), the lever (34) is arranged on the insulating installation base (3) in a penetrating mode, one end of the lever is matched with the cam disc (221), and the other end of the lever is movably connected with a contact of the vacuum tube (33); the transition resistor (32) is fixed on the bottom surface of the insulating mounting base (3);

the two lead-out copper rings are embedded at the upper end of the insulating mounting base (3), the two lead-out copper rings comprise an inner lead-out copper ring (38.1) and an outer lead-out copper ring (38.2), the two moving contacts (231) comprise a short moving contact (231.1) and a long moving contact (232.2), the outer end of the short moving contact (231.1) is pressed on the fixed contact, and the inner end is pressed on the outer lead-out copper ring (38.2); the outer end of the long moving contact (232.2) is pressed on the fixed contact, and the inner end is pressed on the inner lead-out copper ring (38.1).

3. A disc vacuum on-load tap changer according to claim 2, wherein: the short moving contact (231.1) is electrically connected with a vacuum tube (33) through an outer lead-out copper ring (38.2), and the long moving contact (232.2) is electrically connected with the transition resistor (32) through an inner lead-out copper ring (38.1); the fixing seat (345) is electrically connected with the two vacuum tubes (33), and the transition resistor (32) is electrically connected with one of the vacuum tubes (33).

4. A disc vacuum on-load tap changer according to claim 2, wherein: the cam disc (221) is circumferentially provided with a cam (2211), the lever (34) comprises a driving arm (341), a driven arm (342) and a connecting shaft (343) for connecting the driving arm (341) and the driven arm (342), the connecting shaft (343) is arranged on the insulating mounting base (3) in a penetrating mode, the driving arm (341) is arranged above the insulating mounting base (3), one end of the driving arm is fixedly connected with the connecting shaft (343), and the other end of the driving arm is provided with an abutting block (344) matched with the cam (2211); the driven arm (342) is positioned below the insulating mounting base (3), one end of the driven arm is fixedly connected with the connecting shaft (343), and the other end of the driven arm is connected with the contact of the vacuum tube (33); the cam disc (221) rotates to enable the cam (2211) to push the abutting block (344) to enable the driving arm (341) to swing, and the driven arm (342) is driven to swing to drive the vacuum tube (33) to act.

5. A disc vacuum on-load tap changer as defined in claim 4, wherein: the vacuum tubes (33) in the three groups of moving contact assemblies (23) are circumferentially arranged along the center of the bottom surface of the insulating mounting base (3).

6. A disc vacuum on-load tap changer according to claim 2, wherein: a plurality of mounting brackets (36) are arranged on the insulating mounting base (3), and the mounting brackets (36) are fixedly connected with the fixing plate (21) through screws; the mounting bracket (36) and the insulating mounting base (3) are integrally formed.

7. A disc vacuum on-load tap changer as defined in claim 6, wherein: the middle part of insulating installation base (3) is equipped with insulating bulge loop (314), be fixed with many stand (315) on insulating bulge loop (314), the upper portion of stand (315) passes carousel (22) and fixed plate (21) fixed connection.

8. A disc vacuum on-load tap changer as defined in claim 7, wherein: the lower extreme circumference of fixed plate (21) is equipped with multiunit roller train, roller train is including being fixed in the gyro wheel support of fixed plate (21) lower extreme and install gyro wheel (27) on the gyro wheel support, gyro wheel (27) butt is in the upper end of cam dish (221).

9. A disc vacuum on-load tap changer as defined in claim 8, wherein: the middle part of the turntable (22) is provided with a central hole, the middle part of the fixed plate (21) is provided with a fixed shaft (28) in a penetrating way, the fixed shaft (28) stretches into the central hole, the lower end of the fixed shaft is fixed on the insulating mounting base (3), and the central hole is internally provided with a plurality of first bearings (29) sleeved on the fixed shaft (28); the cam shifting fork (26) is fixedly connected with the shifting fork gear (25) through a key, two assembly holes are formed in the fixing plate (21) corresponding to the transition gear (24) and the shifting fork gear (25), a second bearing (29.2) is arranged in each assembly hole, a short shaft is fixedly arranged on the transition gear (24) in a penetrating mode, and the short shaft and the key are arranged on the second bearing (29.2) in a penetrating mode.

10. A disc vacuum on-load tap changer according to claim 1, wherein: the driving motor (11) is positioned on the fixed plate (21) through the mounting seat (15); the driving mechanism (1) further comprises a gear display assembly, the gear display assembly comprises a gear shifting fork (12) fixed on a motor shaft, a positioning bracket (141) arranged on a mounting seat (15), a positioning pin (142) penetrating through the positioning bracket (141), a gear grooved wheel (143) arranged on the positioning pin (142) and a gear circuit board (144), and the gear shifting fork (12) can shift the gear grooved wheel (143) to display the state of the tapping switch;

the motor gear (13) is arranged on the gear shifting fork (12) and extends out of the lower end of the mounting seat (15);

the driving motor (11) is a miniature brushless direct current gear motor, a protective cover (16) is sleeved on the outer side of the driving motor (11), the lower end of the protective cover (16) is fixedly connected with a motor mounting frame (17), an assembly groove for accommodating the gear display assembly is formed at the upper end of the mounting seat (15), and the motor mounting frame (17) is fixedly covered on the assembly groove.