CN112164600A

CN112164600A - Transformer voltage regulating switch with interlocking function

Info

Publication number: CN112164600A
Application number: CN202011280333.6A
Authority: CN
Inventors: 吴正文; 姜方军
Original assignee: Zhejiang BothWell Electric Co Ltd
Current assignee: Zhejiang BothWell Electric Co Ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-01-01

Abstract

The invention relates to the technical field of distribution and transformation of transformers, and provides a transformer voltage regulating switch with an interlocking function. The five-pin polarity switch is provided with five connecting pins and two linkage pieces, and the switch operating mechanism comprises a driving device and a limiting linkage assembly. The switch operating mechanism ensures that the opening and closing states of the vacuum arc-extinguishing chambers are mutually associated and locked, greatly reduces the probability of circuit safety accidents, and has the advantages of simple structure and small volume.

Description

Transformer voltage regulating switch with interlocking function

Technical Field

The invention relates to the technical field of distribution and transformation of transformers, in particular to a transformer voltage regulating switch with an interlocking function.

Background

The voltage regulating principle of the transformer is that a plurality of taps are led out from a coil at one side of the transformer, and under the condition that load current is not cut off through an on-load tap-changer, another tap is switched to another tap so as to change the effective number of turns of the coil and achieve the purpose of regulating voltage.

In the prior art, as shown in fig. 1, the five-level transformer on-load voltage regulation circuit with polarity conversion, which is disclosed in chinese patent application publication No. CN110212830A, is composed of a main loop, a transition loop, and a rated voltage branch, wherein the main loop is composed of a main winding, a voltage regulation winding, three voltage regulation branches, and a vacuum arc-extinguishing chamber, the voltage regulation winding is provided with an upper end tap, a middle tap, and a lower end tap, the three voltage regulation branches are respectively connected with the three taps of the voltage regulation winding and the inner end of the main loop straight-air arc-extinguishing chamber, and each voltage regulation branch is connected with a selector switch in series; the output end of the main winding is respectively connected with an upper end tap and a lower end tap of the voltage regulating winding through a polarity switch; one end of the transition loop is connected with a tap in the middle of the voltage regulating winding, and the other end of the transition loop is connected with an external connection end of a straight air arc extinguish chamber of the main loop; one end of the rated voltage branch is connected with the output end of the main winding, and the other end of the rated voltage branch is connected with the inner connecting end of the main loop straight air arc extinguishing chamber. In the voltage regulating process, the transition voltage is different along with different gears, so that the voltage fluctuation in the voltage regulation is effectively reduced.

However, the five-gear voltage regulating circuit needs 3 voltage regulating branches to be matched, so that the five-gear voltage regulating circuit is large in size and high in cost. If the polarity conversion circuit is redesigned, the number of voltage regulating branches is hopefully reduced remarkably, and the structure and the volume of the voltage regulating switch are simplified.

In addition, there is no disclosure of the mechanical structure of the tap changer made by using the on-load tap changing circuit of the multi-step transformer with polarity conversion. Generally, the on-off of the vacuum interrupter is controlled by a separate operating mechanism. However, in a circuit with a plurality of vacuum arc-extinguishing chambers, the possibility of serious accidents under certain switch on-off combinations caused by misoperation or accidental factors is increased. For example, in fig. 1, if K1 and K3 are closed simultaneously, or K1 and K2 are closed simultaneously, or K2 and K3 are closed simultaneously due to a fault, both end taps of the voltage regulating winding are shorted, and a circuit fault occurs due to a large current.

Disclosure of Invention

The invention aims to further optimize and improve the voltage regulating circuit structure, simplify the circuit structure through the improved polarity switch, overcome the defects of large occupied space and high cost of the voltage regulating switch, improve the operating mechanism of the vacuum arc extinguish chamber, reduce potential safety hazards from the source and combine the voltage regulating switch with the interlocking function on the load of the transformer.

The technical scheme of the invention is as follows: a transformer voltage regulating switch with an interlocking function comprises a bottom plate, a shell, a five-pin polarity switch, a vacuum arc extinguish chamber module, a protective resistor and a switch operating mechanism; all parts are arranged on the bottom plate, and the shell is sleeved on the bottom plate;

the five-pin polarity switch comprises five connecting pins, two linkage pieces, a connecting pin mounting seat and a linkage piece driving device; the five connecting pins are distributed on the connecting pin mounting seat at intervals along a straight line, the two circular linkage pieces are mounted on the linkage piece driving device, the connecting line direction of the two circular linkage pieces is parallel to the straight line where the five connecting pins are located, and the distance between the linkage pieces is twice of the distance between the connecting pins; the linkage sheet driving device comprises a limiting groove, a push rod, a U-shaped bracket and an electromagnetic driver; the linkage piece is arranged on the push rod through a limit groove with a built-in spring, the push rod is limited by a pair of U-shaped supports arranged on the bottom plate, and one end of the push rod is connected with the electromagnetic driver and can axially slide; through the switching of the linkage piece between the two positions, the connection relation of five connecting pins of the five-pin polarity switch is changed, so that the polarity conversion control of an accessed circuit is realized;

the vacuum arc extinguish chamber module comprises a plurality of Z vacuum arc extinguish chambers which are arranged in parallel, I-shaped supporting bars for fixing the vacuum arc extinguish chambers and a multi-position bracket;

the switch operating mechanism comprises a driving device and a limiting linkage assembly, wherein the driving device comprises an electromagnetic mechanism, a push rod and two sets of pushing assemblies; the limiting linkage assembly comprises a limiting movable part, a supporting fixed part and a tongue piece movable part.

The electromagnetic mechanism is fixed on the bottom plate, and the push rod penetrates through the electromagnetic mechanism and can be driven in two directions along the axial direction; the two sets of pushing assemblies are symmetrically arranged at two ends of the pushing rod and comprise pushing blocks and pushing blocks; the push block is arranged on a section of the two ends of the push rod extending out of the electromagnetic mechanism and is in sliding fit with the push rod, and the two ends of the push rod are provided with limiting structures for limiting the push block to slide towards the direction far away from the electromagnetic mechanism; a push block tongue piece capable of sliding up and down is arranged in the push block, an elastic piece is arranged above the push block tongue piece, the lower end of the elastic piece extends out of the push block, and a chamfer inclined plane is arranged on one side far away from the electromagnetic mechanism; an elastic mechanism for pushing the push block to slide towards the direction far away from the electromagnetic mechanism is arranged between the push block and the electromagnetic mechanism on the push rod; the ejector block is fixed on the bottom plate and can block the push block from moving in the direction away from the electromagnetic mechanism; the lower part of the ejector block is provided with a convex inclined plane which is respectively parallel to the chamfer inclined plane of the tongue piece of the ejector block at the same side and can be in sliding fit with the tongue piece of the ejector block;

the limiting movable piece is arranged on the bottom plate in a left-right sliding mode, a plurality of tooth grooves matched with the pushing block tongue pieces are formed in the two ends above the limiting movable piece, Z limiting sliding grooves which are transversely arranged are formed in the limiting movable piece, and each limiting sliding groove is of a specific up-down fluctuation shape; the number of the tongue piece moving parts is Z, the rear ends of the tongue piece moving parts are respectively connected with the movable conductive columns of the vacuum arc extinguish chamber, and the front ends of the tongue piece moving parts are respectively installed in the limiting sliding grooves of the limiting moving parts through pin shafts; the supporting fixed piece is fixed on the bottom plate and is provided with Z grooves for limiting the pin shaft to move only in the vertical direction.

In the circuit design, the connecting pin of the five-pin polarity switch is sequentially a first connecting pin from left to right, a second connecting pin, a third connecting pin, a fourth connecting pin and a fifth connecting pin, the vacuum arc extinguish chamber is sequentially Km from right to left, K0, K1 … … Kn (wherein n is a positive integer), Ke, then the first connecting pin and the fifth connecting pin and the lower end tap of the voltage regulating winding are connected, the second connecting pin and the Km are connected in a fixed end mode, the third connecting pin and the upper end tap of the voltage regulating winding are connected, the fourth connecting pin and the lower end tap of the main winding are connected in a fixed end mode, and the middle tap of the voltage regulating winding is connected with the fixed end of K1 … … Kn respectively. The protective resistor is connected in parallel with the vacuum arc-extinguishing chamber K0.

Through on-off control of the vacuum arc-extinguishing chamber and switching of two connection states of the five-pin polarity switch, serial on-off and positive and negative direction control of the voltage regulating winding to the main winding and control of the number of connected voltage regulating coils can be realized, and therefore the function of the multi-gear voltage regulating switch is realized.

When n =1, 4 vacuum arc-extinguishing chambers are provided, and the voltage regulating winding is divided into two sections of voltage regulating coils to form a five-gear voltage regulating switch.

When n =2, there are 5 vacuum arc-extinguishing chambers, the voltage-regulating winding is divided into 3 sections of voltage-regulating coils, and a seven-gear voltage-regulating switch can be formed.

When n =3, total 6 vacuum interrupter, 4 sections voltage regulating coil of voltage regulating winding branch constitute nine grades of voltage regulating switch.

And so on. Therefore, the structure designed by the invention can be suitable for various pressure regulating gear requirements.

As described above, the five-pin polarity switch of the present invention is driven by an electromagnetic driver. The vacuum arc extinguish chamber module is controlled by a switch operating mechanism, and the principle is as follows:

and the limiting sliding grooves on the limiting moving parts respectively restrict the up-and-down movement of each tongue piece moving part through the pin shafts, so that the movement of the movable conducting rods at the movable ends of the vacuum arc-extinguishing chambers is guided. When the limiting moving part moves transversely, each limiting sliding groove on the limiting moving part also moves, the shaft pin at the front end of the tongue piece moving part in the limiting sliding groove can only move up and down to adapt to the position of the sliding groove, and the fluctuation of the height shape of each limiting sliding groove drives each moving conducting rod to extend or retract in a preset state, so that the switching-on or switching-off of each arc extinguish chamber is realized. Therefore, the limiting moving part moves at different transverse positions, and the switching of different on-off combination states of the vacuum arc-extinguishing chambers can be realized, namely the gear switching of the voltage regulating switch.

Due to the fixed linkage relation among the limiting sliding grooves, the on-off states of the arc extinguishing chambers are mutually associated and are not allowed to be controlled independently, and only a plurality of required states are combined, so that the design is named as 'with an interlocking function', and circuit faults and potential safety hazards caused by misoperation can be effectively avoided.

The limiting movable part is used as a driven part of the driving device, and the driving device completes transverse driving control on the limiting movable part.

Under the default state that the electromagnetic mechanism is not electrified, the elastic mechanism respectively pushes the push blocks at two ends to be contacted with the push blocks, the push blocks respectively push the limiting structures at the end parts of the push rods, and the push rods are naturally positioned at the central positions of the electromagnetic mechanism and marked as initial positions. Under the default state, the tongue piece of the push block in the push block is propped against the convex inclined surface of the top block, and most of the tongue piece is contracted in the push block.

The axial direction of the push rod is used as the left-right direction. When the electromagnetic mechanism drives the pushing rod to move leftwards, the pushing rod simultaneously drives the pushing block on the right side to move leftwards; when the right push block moves leftwards and leaves the right ejector block, the tongue piece of the right push block is pushed by the built-in elastic piece to extend out, and the lower end of the tongue piece of the right push block extends into a tooth groove at the right end above the limiting moving piece to drive the driven piece to move leftwards by a unit stroke. The right-hand spring mechanism is compressed during this process. After the electromagnetic mechanism stops being electrified, the right push block and the push rod return to the initial position under the action of the right elastic mechanism. In the process that the right side push block is reset rightwards, the tongue piece of the push block with the chamfer inclined plane is contacted with the right edge of the tooth socket of the limiting moving part like an inclined tongue lock and retracts upwards into the push block, so that the limiting moving part still stays at the previous position after the push block and the push rod are reset. The process that the limiting moving part moves leftwards by one unit stroke is described above. Because the two ends above the limiting moving part are provided with the tooth sockets, the electromagnetic mechanism drives the push rod for many times in the same direction so as to enable the limiting moving part to continuously move for a plurality of unit strokes in the same direction.

And the process is completely bilaterally symmetrical, when the electromagnetic mechanism drives the push rod to move rightwards, the driven piece can move rightwards by one unit of stroke. Therefore, the limiting moving part can realize bidirectional multistage movement, and each stage of position corresponds to the on-off combined state of a vacuum arc extinguish chamber, namely a gear of the voltage regulating switch. Because the driving device can drive the limiting moving part in two directions and the displacement can be accumulated, theoretically, the combination of the operating mechanism for controlling the on-off of the switch of the vacuum arc extinguish chamber can be infinite.

Preferably, the limiting movable piece and the supporting fixed piece are designed into a U shape with double layers in a side view. As mentioned above, the pin shaft at the front end of the tongue piece moving part is simultaneously restrained by the sliding groove on the limiting moving part and the groove on the supporting moving part, and if the three parts are all in a single-layer sheet shape, the pin shaft is uneven in stress and easy to incline. The limiting and fixing piece and the supporting and fixing piece are made into double-layer U-shaped pieces, the U-shaped supporting and fixing piece is thickest, the U-shaped limiting piece is installed in the middle hollow area, the sheet tongue piece moving piece is arranged in the middle of the double-layer panel of the U-shaped limiting piece, a symmetrical laminated and staggered structure is formed, and the working stability of the limiting linkage assembly and the whole voltage regulating switch is greatly enhanced.

Further, for a five-gear on-load tap changer which is commonly used, the tap changer operating mechanism of the invention controls four vacuum arc-extinguishing chambers simultaneously, namely Z =4, under the condition that four limiting sliding chutes are arranged in the limiting movable part, three position states are provided, and the length of each sliding chute is twice of the distance between the tooth sockets.

Further, the mode that the stopper realizes sliding left and right relative to the bottom plate does: a pair of transverse sliding grooves is arranged and is matched and installed with a pin fixed on the bottom plate.

Furthermore, the limiting structures at the two ends of the push rod are nuts screwed at the end part of the push rod.

Furthermore, the distance between the two top blocks is equal to the distance between the limiting structures at the two ends of the push rod.

Further, the tooth socket distance of the limiting moving part is equal to the distance of single movement of the push rod.

Further, the electromagnetic mechanism comprises a fixed frame, a pair of static armatures, a movable armature and an electromagnetic coil. The fixed frame is fixed on the corresponding bottom plate, the static armatures are symmetrically arranged at two ends of the fixed frame, and the movable armatures are arranged on the fixed frame and are in sliding fit with the fixed frame and can move between the two static armatures. The pushing rod penetrates through the movable armature and the static armature, and the pushing rod is fixed with the movable armature and is in sliding fit with the static armature. The electromagnetic coils are divided into a left group and a right group and are arranged on the fixed frame.

Furthermore, the elastic piece above the tongue piece of the push block is a spring; the elastic mechanism on the push rod is a spring sleeved on the push rod.

According to the transformer voltage regulating switch with the interlocking function, the five-pin polarity change-over switch is arranged to replace a conventional polarity change-over switch, so that the number of voltage regulating branches and the number of required switch elements are reduced; the vacuum arc extinguish chamber is controlled by using the operating mechanism with the interlocking function, and the unified driving is completed by one set of driving device, so that the operation reliability and the safety of the voltage regulating switch are improved. Compared with the prior art, the transformer voltage regulating switch is safer, has a more simplified structure, is smaller in size and greatly reduces the cost.

Drawings

Fig. 1 is a schematic circuit diagram of a comparison document (chinese patent publication No. CN 110212830A).

Fig. 2 is a general schematic diagram of an embodiment of a five-gear transformer tap changer using the driving device of the present invention.

Fig. 3 is a schematic diagram of a five-pin polarity switch in the voltage regulating switch according to the present invention.

Fig. 4 is a schematic diagram of a transformer tap changer operating mechanism with an interlock function including the driving device of the present invention.

Fig. 5 is a schematic view of the driving device according to the present invention.

Fig. 6 is a front sectional view of the electromagnetic mechanism.

Fig. 7 is a left side view of the electromagnetic mechanism.

Fig. 8 is a schematic front view and a schematic left view of the U-shaped limiting stopper in fig. 4.

Figure 9 is a three-dimensional view of the U-shaped support member of figure 4.

Fig. 10 is a circuit connection diagram of the embodiment shown in fig. 1.

Detailed Description

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the present embodiment, n =1 of the vacuum interrupter mark Kn is the case, that is, four vacuum interrupters Km, K0, K1, and Ke are shared, and the entire voltage regulating switch is a five-step voltage regulating switch. While embodiments of the invention are illustrated in the drawings, it should be understood that the invention can be embodied in various similar forms and should not be construed as limited to the embodiments set forth herein. The following directional terms such as up, down, left, right, etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present embodiment, but not for limiting the present invention.

Referring to fig. 2-5 (all viewed as a top view), a five-level transformer voltage regulating switch with an interlock function includes a housing (not shown), a bottom plate 100, a five-pin polarity switch Kj, a vacuum interrupter module, a protection resistor 33, and a switch operating mechanism; the bottom plate is the rectangle, and parts or subassembly except that the shell all install on the bottom plate, the shell cover protects inside part on the bottom plate.

Fig. 3 shows the five-pin polarity switch Kj, which includes five connecting pins 6, two linkage plates 13, a connecting pin mounting seat 10 and a linkage plate driving device; the five connecting pins are distributed on the connecting pin mounting base 10 at intervals along a straight line, the two circular linkage pieces 13 are mounted on the linkage piece driving device, and the connecting line direction of the two circular linkage pieces is parallel to the straight line where the five connecting pins are located; the linkage sheet driving device comprises a limiting groove 14, a push rod 20, a pair of U-shaped supports 21 and an electromagnetic driver 24; the linkage piece 13 is arranged on a push rod 20 through a limiting groove 14 with a built-in spring, the push rod 20 is limited by a pair of U-shaped support limiting brackets 21 arranged on a bottom plate to move up and down, one end of the push rod is limited in a sliding groove of the limiting bracket 21 on the left side through a pin shaft, and the other end of the push rod is connected with an electromagnetic driver 24 and can slide axially;

the vacuum arc-extinguishing chamber module comprises 4 vacuum arc-extinguishing chambers K0, Ke, Km and K1 which are arranged in parallel, and an I-shaped supporting bar 32 and a four-position bracket 31 which are used for fixing the vacuum arc-extinguishing chambers.

Fig. 4 shows the switch operating mechanism, including a drive device and a limit linkage assembly.

Fig. 5 shows the driving device, which includes a fixed frame 41,

static armatures

42 and 43, a movable armature 44, an electromagnetic coil 40, a pushing rod 45, a pair of pushing assemblies and a U-shaped limit moving part 53 as a driven part. The limit linkage assembly comprises a U-shaped limit movable piece 53, a U-shaped supporting fixed piece 60 and four tongue piece movable pieces 65. Wherein, the fixed mount, the static armature, the movable armature and the electromagnetic coil form an electromagnetic mechanism.

The fixed frame 41 is fixed on the bottom plate 100, the fixed

armatures

42 and 43 are symmetrically arranged at two ends of the fixed frame 41, and the movable armature 44 is arranged on the fixed frame and is in sliding fit with the fixed frame and can move between the two fixed armatures. The pushing rod 45 transversely penetrates through the movable armature 44 and the

static armatures

42 and 43, and the pushing rod 45 is fixed with the movable armature 44 and is in sliding fit with the static armatures. The electromagnetic coils 40 are divided into a left group and a right group and are arranged on the fixed frame, the left electromagnetic coil 401 partially covers the left static armature 42 and the movable armature 44, and the right electromagnetic coil 402 partially covers the right static armature 43 and the movable armature 44.

Specifically, as shown in fig. 6 and 7, the fixing frame 41 of the electromagnetic mechanism is composed of a pair of fixing frames 411 and a plurality of laminated silicon steel sheets 413; the fixing frame 411 is a rectangular ring, is arranged at intervals from top to bottom, is vertically fixed on the bottom plate 100 through 4L-shaped brackets 415, and silicon steel sheets 413 are clamped between the fixing frames 411; the silicon steel sheets 413 are in a chevron shape, two groups of upper and lower laminated silicon steel sheets are arranged in the height direction perpendicular to the bottom plate 100, the opening of the lower silicon steel sheet group faces upwards, the opening of the lower silicon steel sheet group faces downwards, a space is reserved between the upper and lower silicon steel sheet groups, and the movable armature 44 and the

static armatures

42 and 43 are arranged in the space. Electromagnetic coils 401 and 402 (shown by the outline of the coil in fig. 5, and the bobbin around which the electromagnetic coil is wound in fig. 6 and 7) are respectively disposed in two rectangular spaces formed by two silicon steel sheet groups facing each other in a chevron shape.

The pushing assemblies are symmetrically arranged at two ends of the pushing rod 45, the left side comprises a pushing block 46 and an ejector block 48, and the right side comprises a pushing block 47 and an ejector block 49. The push blocks 46 and 47 are provided with transverse through holes, the two push blocks are oppositely sleeved on sections of the two ends of the push rod 45 extending out of the electromagnetic mechanism and are in sliding fit with the push rod 45, and nuts are arranged at the two ends of the push rod to block the push blocks; the lower parts of the push blocks 46 and 47 are provided with longitudinal sliding groove holes, the sliding groove holes are respectively internally provided with a push block tongue piece 51 and a push block tongue piece 52 which can slide, and the bottoms of the sliding groove holes are provided with springs; the push block tongue piece is a rectangular column, the lower end of the left push block tongue piece 51 is provided with a chamfer inclined plane close to the left, and the lower end of the right push block tongue piece 52 is provided with an inclined plane chamfer close to the right. The push rod 45 is sleeved with a pair of return springs which are respectively positioned between the two push blocks and the electromagnetic mechanism. The ejector block is fixed on the bottom plate, the left ejector block 48 can block the push block 46 from moving leftwards, and the right ejector block 49 can block the push block 47 from moving rightwards; the lower parts of the ejector blocks 48 and 49 are provided with convex inclined surfaces which are respectively parallel to the chamfer inclined surfaces of the tongue pieces of the ejector blocks on the same side and can be in sliding fit with each other. The two ends of the upper part of the U-shaped limiting moving part 53 are provided with a plurality of tooth grooves matched with the pushing block tongue pieces, the width of each tooth groove is equal to that of the pushing

block tongue pieces

51 and 52, and the distance between the tooth grooves is equal to the single movement stroke of the push rod 45. The distance between the contact surfaces of the ejector blocks 48 and 49 with the push blocks is equal to the distance between the contact surfaces of the nuts at the two ends of the push rod 45 with the push blocks.

The U-shaped limiting moving part 53 is arranged on the bottom plate in a left-right sliding manner, a plurality of tooth sockets matched with the tongue pieces of the pushing block are arranged at two ends above the U-shaped limiting moving part, 4 limiting sliding grooves which are transversely arranged are arranged in the U-shaped limiting moving part, and each limiting sliding groove is in a specific up-down fluctuation shape; the number of the tongue piece moving parts 65 is 4, the rear ends of the tongue piece moving parts are respectively connected with the movable conductive columns of the vacuum arc-extinguishing chamber, and the front ends of the tongue piece moving parts are respectively installed in the limiting sliding grooves of the limiting moving parts 53 through pin shafts; the supporting member 60 is fixed to the base plate and has 4 grooves 61 for limiting the movement of the pin shaft only in the up-and-down direction.

As shown in the front view and the side view of fig. 8, the U-shaped limiting moving part 53 is a U-shaped double-layer structure, and the four tongue moving parts 65 are installed in the hollow groove space in the middle; the structure of the U-shaped supporting fixed piece 60 is shown in the three-view of FIG. 9, and is also a U-shaped double-layer structure when seen from the side, and the hollow space in the middle can just accommodate the thickness of the U-shaped limiting movable piece 53; the three components form a five-layer laminated structure which is symmetrical up and down, and four pin shafts penetrate through the five-layer laminated structure and connect the five-layer laminated structure.

On the connection of the circuit, referring to fig. 10, a first connecting pin 1 is connected with a fifth connecting pin 5 and a tap X3 at the lower end of a regulating coil L2 in a regulating winding, a second connecting pin 2 is connected with the fixed end of a vacuum arc-extinguishing chamber Km, a third connecting pin 3 is connected with a tap X1 at the upper end of a regulating coil L1 in the regulating winding, a fourth connecting pin 4 is connected with a tap at the lower end of a main winding L and the fixed end of a vacuum arc-extinguishing chamber Ke, and a tap X2 connected with the middle of the regulating coil L1 and the L2 in the regulating winding is connected with the fixed end of the vacuum arc-extinguishing chamber K1. And an upper end tap of the main winding L is connected with the input end A of the whole voltage regulating switch circuit. The protection resistor 33 (R in the circuit diagram) and the vacuum interrupter K0 are connected in parallel to form a transition switching unit, which plays a role of protecting the circuit during switching. In the transition switching unit, the movable end of the vacuum arc extinguish chamber K0 is connected with the movable ends of the vacuum arc extinguish chambers Km and Ke and the output end X0 of the whole voltage regulating switch circuit, and the fixed end of the vacuum arc extinguish chamber K0 is connected with the movable end of the vacuum arc extinguish chamber K1.

Referring to fig. 10, the combination state of the polarity switch Kj and the on-off switches corresponds to each gear of the voltage regulating circuit as follows:

the first linkage structure is that the linkage sheet 11 is simultaneously communicated with the connecting pin 1 and the connecting pin 2, the linkage sheet 12 is simultaneously communicated with the connecting pin 3 and the connecting pin 4, and the switch states of all gears are as follows

Third gear: ke is closed, K0 is opened, and both L1 and L2 are not connected into the circuit, so that power is supplied by rated voltage;

fourth gear: ke is open, K1 is closed, K0 is closed, and L1 is connected into the circuit;

fifth gear: ke is open, Km is closed, K0 is open, and L1 and L2 are connected into the circuit;

the second linkage structure is that the linkage sheet 11 is simultaneously communicated with the connecting pin 2 and the connecting pin 3, the linkage sheet 12 is simultaneously communicated with the connecting pin 4 and the connecting pin 5, and the switch states of all gears are as follows

second gear: ke is opened, K1 is closed, K0 is closed, and L2 is reversely connected into the circuit;

first gear: ke is opened, Km is closed, K0 is opened, and L2 and L1 are reversely connected into the circuit;

the following describes how the switch operating mechanism in this embodiment realizes unified operation of the vacuum interrupter modules by taking an example of five-gear shifting as four-gear shifting.

As illustrated in fig. 2, the polarity switch is in the first linkage state, and the U-shaped limit stop is at the leftmost position, and the state of the tongue-movable piece is defined by the former limit chute 54 as: corresponding to Km contraction, corresponding to K0, K1, Ke extension. That is, since the graph corresponds to a state where Km is closed and K0, K1, and Ke are open, the illustrated pressure regulating switch is in the fifth position where the boost pressure is highest.

The right electromagnetic coil 402 is electrified, under the magnetization effect, the right static armature 43 attracts the moving armature 44 to move rightwards, the push rod 45 also moves rightwards, the left nut drives the push block 46 to move rightwards, the moving distance is equal to the distance between the tooth grooves 58 above the U-shaped limiting moving part 53, and the moving distance is half of the horizontal length of the single limiting sliding groove 54. In the initial state, the chamfer of the lower end inclined plane of the push block tongue piece 51 is attached to the inclined plane of the top block 48 and limited in the chute hole of the push block 46, when the push rod moves rightwards, the push block tongue piece 51 is pushed by the built-in spring to extend downwards to the position of the dotted line in fig. 4 and is matched with the tooth groove 58, and therefore the U-shaped limiting moving piece 53 is driven to move rightwards. In the process, the return spring sleeved on the push rod 45 between the static armature 42 and the push block 46 is compressed; when the stop member 53 reaches a predetermined position, the electromagnetic coil 402 is powered off, the push rod 45 returns to the central position under the elastic force of the return spring, the chamfered inclined surface of the push block tongue piece 51 collides with the edge of the tooth groove 58, and the stop member is forced to retract into the sliding groove hole of the push block 46 like a latch bolt door lock, and the stop member remains at the pushed position due to friction force. The distance of the U-shaped limiting movable piece 53 moving rightwards is half of the length of the limiting sliding groove 54, so that the four tongue piece movable pieces 65 are respectively positioned in the middle of the limiting sliding groove 54 after moving.

By comparing the specific shape of each limiting chute in fig. 8, it can be known that after the chute 54a is displaced, the corresponding pin shaft is changed from the low position at the right end to the high position at the middle, and the corresponding vacuum arc-extinguishing chamber Km is disconnected; after the sliding groove 54b is displaced, the corresponding pin shaft is changed from the high position at the right end to the low position at the middle, and the corresponding vacuum arc-extinguishing chamber K0 is closed; after the sliding groove 54c is displaced, the corresponding pin shaft is changed from the high position at the right end to the low position at the middle, and the corresponding vacuum arc-extinguishing chamber K1 is closed; the upper and lower positions of the pin shaft before and after the displacement of the chute 54d are unchanged, and the corresponding vacuum arc-extinguishing chamber Ke is kept disconnected. So that the state of the voltage regulating circuit is changed from the fifth gear to the fourth gear.

If the electromagnetic coil 402 is energized once more, the above process is repeated, the U-shaped stopper 53 moves from the middle position to the rightmost position, and the four pins and the associated tongue piece 65 change from the middle position of the stopper chute 54 to the leftmost position. The pin shaft corresponding to the chute 54a is fixed, and Km is kept disconnected; the pin shaft corresponding to the sliding groove 54b is changed from the low position to the high position, and K0 is disconnected; the pin shaft corresponding to the chute 54c is changed from the low position to the high position, and K1 is disconnected; the pin shaft corresponding to the chute 54d is changed from the high position to the low position, and Ke is disconnected. So that the voltage regulating circuit is changed from the fourth gear to the third gear.

If the reverse boosting adjustment is needed, the left electromagnetic coil 401 is energized, and the push block 46 and the push block tongue piece 52 drive the U-shaped limit moving piece 53 to move leftwards in a completely symmetrical manner, so that the limit linkage assembly moves reversely as above, and the switching from the third gear to the fourth gear or from the fourth gear to the fifth gear is completed.

Claims

1. A transformer voltage regulating switch with an interlocking function comprises a bottom plate, a shell, a five-pin polarity switch, a vacuum arc extinguish chamber module, a protective resistor and a switch operating mechanism; all parts are arranged on the bottom plate, and the shell is sleeved on the bottom plate;

the five-pin polarity switch comprises five connecting pins, two linkage pieces, a connecting pin mounting seat and a linkage piece driving device; the five connecting pins are distributed on the connecting pin mounting seat at intervals along a straight line, the two circular linkage pieces are mounted on the linkage piece driving device, the connecting line direction of the two circular linkage pieces is parallel to the straight line where the five connecting pins are located, and the distance between the linkage pieces is twice of the distance between the connecting pins; the linkage sheet driving device comprises a limiting groove, a push rod, a U-shaped bracket and an electromagnetic driver; the linkage piece is arranged on the push rod through a limit groove with a built-in spring, the push rod is limited by a pair of U-shaped supports arranged on the bottom plate, and one end of the push rod is connected with the electromagnetic driver and can axially slide;

the vacuum arc extinguishing module comprises Z vacuum arc extinguishing chambers which are arranged in parallel, I-shaped supporting bars for fixing the vacuum arc extinguishing chambers and a multi-position bracket;

the switch operating mechanism comprises a driving device and a limiting linkage assembly, wherein the driving device comprises an electromagnetic mechanism, a push rod and two sets of pushing assemblies; the limiting linkage assembly comprises a limiting movable part, a supporting fixed part and a tongue piece movable part;

2. The voltage-regulating switch with interlocking function for transformer according to claim 1, wherein the limiting moving member and the supporting fixed member are of U-shaped double-layer three-dimensional structure, the tongue piece moving member is installed in the hollow space in the middle of the limiting moving member, and the limiting moving member is embedded in the hollow space in the middle of the supporting fixed member.

3. The voltage-regulating switch of transformer with interlocking function as claimed in claim 1, wherein Z =4, said limiting moving member has three position states, the length of its limiting sliding slot is twice as long as its tooth slot pitch; this requirement is suitable for a five-step voltage regulating switch having a winding with two voltage regulating coils.

4. The voltage-regulating switch with interlocking function for transformer as claimed in claim 1, wherein said limiting moving member further has a pair of transverse sliding grooves, and is mounted to cooperate with a pin fixed to the bottom plate to slide left and right.

5. The voltage-regulating switch with interlocking function for transformer as claimed in claim 1, wherein the limit structure at both ends of the push rod is a nut screwed on the end of the push rod.

6. The voltage regulating switch of transformer with interlocking function as claimed in claim 1, wherein said electromagnetic mechanism comprises a fixed frame, a pair of static armatures, a movable armature and an electromagnetic coil; the fixed frame is fixed on the corresponding bottom plate, the static armatures are symmetrically arranged at two ends of the fixed frame, and the movable armatures are arranged on the fixed frame, are in sliding fit with the fixed frame and can move between the two static armatures; the pushing rod penetrates through the movable armature and the static armature, and the pushing rod is fixed with the movable armature and is in sliding fit with the static armature; the electromagnetic coils are divided into a left group and a right group and are arranged on the fixed frame.

7. The voltage-regulating switch with interlocking function for transformer as claimed in claim 1, wherein the distance between said two top blocks is equal to the distance between the limit structures at both ends of the push rod.

8. The voltage-regulating switch with interlocking function for transformer as claimed in claim 1, wherein the distance between the tooth grooves of said stopper is equal to the distance of single movement of said push rod.

9. The voltage-regulating switch with interlocking function for transformer as claimed in claim 1, wherein the elastic member above the tongue piece of the push block is a spring, and the elastic mechanism on the push rod is a spring sleeved on the push rod.