CN215955161U - Isolating switch of on-load tap-changer - Google Patents

Abstract

The utility model provides an isolating switch of an on-load tap-changer, comprising: a switch housing; the shifting fork rotating shaft is arranged in the switch shell; four static contacts; one end of the switch shifting fork is rotatably arranged on the shifting fork rotating shaft, and the other end of the switch shifting fork is provided with a moving contact; and the first end of the dead point spring is connected with the switch shell, and the second end of the dead point spring is connected with the switch shifting fork. The utility model loads part of parts of the isolating switch through the switch shell, so that the isolating switch is used as an integral switch structure and is used as an independent part for installation design; the switch shifting fork is rotatably connected to the shifting fork rotating shaft, so that the switch shifting fork swings and drives the moving contact to be in switching contact with the two rows of static contacts, and the transition on-off time sequence of the vacuum bubbles is controlled; meanwhile, the dead point position of the dead point spring is arranged between two static positions where the moving contact is contacted with the two rows of static contacts, so that stable and compact contact between the moving contact and the two rows of static contacts is ensured, and the electric characteristics are reliable.

Description

Isolating switch of on-load tap-changer

Technical Field

The utility model relates to the technical field of on-load tap-changers, in particular to an isolating switch of an on-load tap-changer.

Background

An on-load tap changer is a special switch for switching the tapping of a primary or secondary winding to regulate its output voltage in the case of a transformer with a load.

The vacuum bubble is used for replacing a transition copper-tungsten contact in the original on-load tap-changer, which is a new trend of the technical development of the on-load tap-changer in recent years, the pollution of electric arcs generated by the copper-tungsten contact to a switch oil chamber can be avoided, the maintenance and the repair of the switch are reduced, and the service life of the switch is prolonged. In the vacuum on-load tap changer using vacuum bubble transition switching, an isolating switch is required to be matched with and control the on-off time sequence of the vacuum bubble. The isolating switch has no fixed structure, but needs to meet the electrical performance requirement and the mechanical switching time sequence requirement, the existing isolating switch mostly adopts a blade and a clamping piece, the structure is simple and reliable, but the sliding friction in the switching process of the isolating switch is large, and the service life of the switch can be obviously influenced.

Disclosure of Invention

In view of this, the utility model provides an isolating switch of an on-load tap-changer, aiming at solving the problem that the service life of the switch is obviously influenced by the larger sliding friction of the existing clamping piece type isolating switch.

The utility model provides an isolating switch of an on-load tap-changer, which comprises: a switch housing; the shifting fork rotating shaft is arranged in the switch shell; the four static contacts are arranged in the switch shell in two layers and two rows; one end of the switch shifting fork is rotatably arranged on the shifting fork rotating shaft, and the other end of the switch shifting fork is provided with a moving contact which swings along with the switch shifting fork and is switched to be in on-off contact with the two rows of static contacts so as to control the transition on-off time sequence of the vacuum bubbles; the dead point spring is arranged between two static positions where the moving contact is contacted with two rows of static contacts, is compressed to the maximum degree at the dead point position, and exerts the maximum acting force on the switch pulling fork so as to press the switch pulling fork to the static position.

Further, in the disconnecting switch of the on-load tap-changer, the switch fork includes: the switch shifting fork body is rotatably sleeved on the shifting fork rotating shaft; the two shifting fork fixing plates are arranged in the switch shell side by side along the length direction of the switch shifting fork body, the connecting ends of the two shifting fork fixing plates are connected to the switch shifting fork body, the moving contact is arranged on the two shifting fork fixing plates, and the two shifting fork fixing plates swing around the axis of the shifting fork rotating shaft along with the switch shifting fork body so as to drive the moving contact to swing between two rows of fixed contacts; the switch shifting fork comprises a switch shifting fork body, two collision rings and a driving cam mechanism, wherein the two collision rings are arranged on the switch shifting fork body, an included angle is formed between the two collision rings, the two collision rings are used for contacting with the driving cam mechanism and driving two shifting fork fixing plates to swing under the action of the driving cam mechanism so that the movable contact swings to contact with one row of static contacts when the driving cam mechanism applies a reverse driving force, and the other collision ring contacts with the driving cam mechanism and drives the two shifting fork fixing plates to swing under the action of the driving cam mechanism so that the movable contact swings to contact with the other row of static contacts when the driving cam mechanism applies a forward driving force.

Further, in the disconnecting switch of the on-load tap-changer, the movable contact includes: the two moving contact terminals are respectively inserted into the mounting holes of the two shifting fork fixing plates, and contact ends of the two moving contact terminals are arranged outside the two shifting fork fixing plates and are used for respectively contacting two static contacts in a row of static contacts; a force application spring is arranged between the moving contact terminal and the shifting fork fixing plate and is used for applying acting force to the moving contact terminal so as to ensure that the moving contact terminal is in pressure joint with the shifting fork fixing plate; and two ends of the moving contact connecting piece are respectively connected with the connecting ends of the two moving contact terminals so as to realize the connection of the two moving contact terminals.

Further, the isolating switch of the on-load tap-changer further comprises: and the power output end of the driving cam mechanism is in transmission connection with the switch shifting fork and is used for applying driving force to the switch shifting fork so as to enable the switch shifting fork to swing back and forth around the axis of the shifting fork rotating shaft, so that the moving contact is in switching contact with the two rows of static contacts to control the transition on-off time sequence of the vacuum bubbles.

Further, in the disconnecting switch of the on-load tap-changer, the driving cam mechanism includes: a cam base; and the two cams are respectively arranged at two ends of the cam base, one cam applies a forward driving force to the switch pulling fork in a first state so that the movable contact is contacted with one row of static contacts, and the other cam applies a reverse driving force to the switch pulling fork in a second state so that the movable contact is contacted with the other row of static contacts.

Further, in the disconnecting switch of the on-load tap-changer, at least one boss is arranged on each of the two cams along the circumferential direction of the cam, and the bosses of the two cams are arranged in a staggered manner, so that when the boss of any one cam contacts the collision ring correspondingly arranged, the other collision ring is not contacted with the boss of the other cam in a staggered manner; when the cam base rotates anticlockwise, the side wall of the boss of one cam contacts with the collision ring corresponding to the cam, and the collision ring is pushed to be in abutting contact with the outer wall of the boss of the cam, so that the moving contact rotates to be in contact with one row of static contacts; when the cam base rotates clockwise, the side wall of the boss of the other cam contacts the collision ring corresponding to the cam, and the collision ring is pushed to be in abutting contact with the outer wall of the boss of the cam, so that the moving contact rotates to contact with the other row of static contacts.

Furthermore, in the disconnecting switch of the on-load tap-changer, each of the static contacts is provided with a locking buckle for buffering the moving contact when the moving contact contacts the static contact.

Further, in the disconnecting switch of the on-load tap-changer, the locking buckle includes: the middle position of the locking buckle body is rotatably connected to the side wall of the static contact and is used for forming a swing lever structure on the static contact so as to swing under the action of the moving contact when the moving contact abuts against the static contact; and the buffer spring is arranged at the end part of the static contact, which is opposite to the moving contact, and is used for applying a buffer force to the locking buckle body so that the locking buckle body buffers the rotation of the moving contact and the moving contact is slowly close to the static contact.

Further, the isolating switch of the on-load tap-changer comprises: a first housing; the second shell is detachably butted with the first shell, and the second shell and the first shell are surrounded to form a hollow cavity.

Furthermore, in the isolating switch of the on-load tap-changer, two limit rods are arranged in the switch shell and used for respectively limiting the two end positions of the swing stroke of the switch shifting fork so as to limit the swing angle of the switch shifting fork.

According to the isolating switch of the on-load tap-changer, the switch shell is used for loading part of parts of the isolating switch so as to avoid external interference on the normal operation of the isolating switch, and meanwhile, the isolating switch can be used as an independent part to be installed and designed as an integral switch structure, so that the integral modular design of the tap-changer is facilitated; the switch shifting fork is rotatably connected to the shifting fork rotating shaft, so that the switch shifting fork can swing and drive the moving contact to be in switching contact with the two rows of static contacts, and the transition on-off time sequence of the vacuum bubbles is controlled; meanwhile, the dead point position of the dead point spring is arranged between two static positions where the moving contact is contacted with the two rows of static contacts, namely, the dead point spring is compressed to the maximum degree in the interval, so that the switch shifting fork can be pressed to the static positions, the moving contact is ensured to be stably and compactly contacted with the two rows of static contacts, the electrical characteristic is reliable, and the problem that the service life of the switch is obviously influenced due to the fact that the existing clamping piece type isolating switch has large sliding friction is solved.

Furthermore, the double-layer cam reciprocating switching method is adopted, the asymmetric time sequence switching of the electric circuit can be realized, meanwhile, the locking buckle arranged on the static contact can further ensure the stable and compact contact of the conductive contact after the structure is switched in place, and the electric characteristics are reliable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic structural diagram of an on-load tap changer disconnector according to an embodiment of the present invention;

FIG. 2 is a first directional structural diagram of a disconnector and a driving cam mechanism according to an embodiment of the present invention;

FIG. 3 is a second structural view of a disconnector and a driving cam mechanism according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram illustrating specific positions of a disconnector and a driving cam mechanism according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a disconnector and a locking buckle of a driving cam mechanism according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 to 3, a preferred structure of a disconnector of an on-load tap changer according to an embodiment of the present invention is shown. As shown, the isolation switch includes: the switch comprises a switch shell 1, a shifting fork rotating shaft 2, four fixed contacts 3, a switch shifting fork 4, a dead point spring 5 and a driving cam mechanism 6; wherein the content of the first and second substances,

the switch housing 1 may be a box structure for loading part of the components of the isolating switch to avoid external interference with the normal operation of the isolating switch.

The shifting fork rotating shaft 2 is arranged in the switch shell 1, plays a role in swinging and supporting the switch shifting fork 4 to ensure the swinging stability of the switch shifting fork 4, further ensure the rotating stability of the moving contact 41 and further ensure the stability of the disconnecting switch for realizing the switching and the closing of the switch. Specifically, the shift fork rotating shaft 2 can be fixedly connected to the inner wall of the switch housing 1, and a limiting support structure can be arranged on the shift fork rotating shaft to limit the switch shift fork 4, so that the switch shift fork 4 is prevented from moving along the axial direction of the shift fork rotating shaft 2.

The four static contacts 3 are arranged in two layers and two columns in the switch shell 1. Specifically, the four static contacts 3 are divided into two layers arranged up and down along the length direction (vertical direction shown in fig. 3) of the shifting fork rotating shaft 2, and two of the layers are arranged left and right, so that the two upper and lower static contacts 3 on the left side and the two upper and lower static contacts 3 on the right side form two rows, that is, two layers of two rows. The four fixed contacts 3 can be supported inside the switch housing 1 through the fixed contact support, and can also be connected to the inner wall of the switch housing 1 through other methods. In the embodiment, two fixed contacts 3 in one layer of fixed contacts are electrically connected through a conductor, such as a conductive copper sheet 7, and certainly, the two fixed contacts can be at the same potential through external connection; and two fixed contacts 3 in the other layer of fixed contacts are independently arranged. For example, the four fixed contacts 3 may be a first fixed contact 31, a second fixed contact 32, a third fixed contact 33, and a fourth fixed contact 34, respectively; the first fixed contact 31 and the second fixed contact 32 are arranged on the upper layer and are connected with each other through the conductive copper sheet 7, the third fixed contact 33 and the fourth fixed contact 34 are arranged on the lower layer, the first fixed contact 31 and the third fixed contact 33 are arranged on the left side (relative to the position shown in fig. 3) in a flush manner to form a first row of fixed contact group, and the second fixed contact 32 and the fourth fixed contact 34 are arranged on the right side (relative to the position shown in fig. 3) in a flush manner to form a second row of fixed contact group. In the present embodiment, as shown in fig. 3, the first fixed contact 31 and the second fixed contact 32 are connected through the conductive copper sheet 7, and both are at the same electric potential, and the second fixed contact 32 and the fourth fixed contact 34 are separately disposed without connection, and both can be connected to different circuits, and can be at different electric potentials.

One end (the front lower end shown in fig. 1) of the switch fork 4 is rotatably arranged on the fork rotating shaft 2, and the other end (the rear upper end shown in fig. 1) is provided with a movable contact 41, and the movable contact 41 swings along with the switch fork 4 to be in contact with and separated from the two rows of static contacts 3. Specifically, the movable contact 41 can swing to the left side so that the movable contact 41 can be in contact with the upper and lower fixed contacts 3 on the left side and can also swing to the right side so that the movable contact 41 can be in contact with the upper and lower fixed contacts 3 on the right side, the movable contact 41 can be in contact with two rows of fixed contacts 3 in a split-joint mode respectively, and then the transition on-off time sequence of the vacuum bubbles can be controlled so that the vacuum on-load tap-changer can be used for forming an electrical loop with electrical components such as the vacuum bubbles in the vacuum on-load tap-changer and realizing mechanical ordered switching of high-voltage and high-current. In order to restrict the swing angle and the swing end position of the switch yoke 4, preferably, two limit rods 11 are arranged in the switch housing 1, and are used for respectively limiting the two end positions of the swing stroke of the switch yoke 4, so as to limit the swing angle of the switch yoke 4, that is, when the switch yoke 4 contacts the limit rod 11 arranged on the left side, the movable contact 41 can contact with the two stationary contacts 3 on the left side, and when the switch yoke 4 contacts the limit rod 11 arranged on the right side, the movable contact 41 can contact with the two stationary contacts 3 on the right side. In order to buffer the motion termination when the moving contact 41 and the static contact 3 are in contact, preferably, each static contact 3 is provided with a locking buckle 8 for buffering the moving contact 41 when the moving contact 41 is in contact with the static contact 3, so as to realize vibration reduction, and the speed of the moving contact 41 is slowly reduced after the moving contact 41 is in place, so that the moving contact can be stably in contact with the static contact 3, the moving contact 41 can rebound due to impact transition without buffering, and the rebound is reduced by the locking buckle 8, and the moving contact 41 can also return to the original position under the action of a force application spring, so as to ensure stable contact between the moving contact 41 and the static contact 3.

The dead point spring 5 has a first end (the upper right end as shown in fig. 1) connected to the switch housing 1, a second end (the lower left end as shown in fig. 1) connected to the switch yoke 4, a dead point position of the dead point spring 5 is set between two rest positions where the movable contact 41 contacts with two rows of the stationary contacts 3, the dead point spring 5 is compressed to the maximum extent at the dead point position, and the maximum possible acting force is applied to the switch yoke 4, so that the switch yoke 4 is pressed to the rest position. Specifically, two ends of a dead point spring 5 can be respectively hinged to the switch housing 1 and the switch yoke 4, the dead point spring 5 can deflect and stretch along with the swing of the switch yoke 4, the dead point position of the dead point spring 5 is arranged between a first static position where the movable contact 41 is in contact with a row of static contacts on the left side and a second static position where the movable contact is in contact with a row of static contacts on the right side, namely, the dead point spring 5 is at the dead point position, and at the moment, the dead point spring 5 has the maximum compression amount; when the dead point spring 5 goes beyond the dead point position, the acting force, i.e., the pushing force, of the dead point spring 5 on the switch yoke 4 changes the direction along the yoke rotating shaft 2, that is, the switch yoke 4 crosses the dead point position in the swinging process between two rows of the static contacts 3, so that the acting force applied to the two sides is opposite, that is, before the cross-country dead point position, the reaction force can be applied to the switch yoke 4, and after the cross-country dead point position, the forward acting force is applied to the switch yoke 4, so that the movable contact 41 can contact the static contacts 3. In the present embodiment, when the dead point spring 5 and the fork fixing plate 43 of the switch fork 4 are aligned, the dead point spring 5 reaches the dead point position, and the dead point spring 5 has the maximum compression amount. In the present embodiment, the inside of the switch case 1 may be provided with a dead-point spring mounting lever 12 for supporting the dead-point spring 5; the first end of the dead point spring 5 is rotatably sleeved on the dead point spring mounting rod 12 so as to rotate and compress along with the swinging of the switch shifting fork 4 and apply pushing and pressing forces at different positions; preferably, the dead-point spring mounting lever 12 can be arranged between two rest positions, so that the dead-point position of the dead-point spring 5 is arranged between the two rest positions.

The power output end of the driving cam mechanism 6 is in transmission connection with the switch fork 4 and is used for applying driving force to the switch fork 4 so as to enable the switch fork 4 to swing back and forth around the axis of the fork rotating shaft 2, and the moving contact 41 is in switching contact with the two rows of static contacts 3 to control the transition on-off time sequence of the vacuum bubbles. Specifically, the drive cam mechanism 6 may be provided outside the switch case 1 so as to apply a driving force to the switch yoke 4. In this embodiment, in the first state, that is, when the movable contact 41 is pre-biased to the two stationary contacts 3 in the row on the left side (as shown in the position shown in fig. 3), the driving cam mechanism 6 can apply a forward driving force to the switch yoke 4 when rotating counterclockwise, so that the switch yoke 4 rotates clockwise until the movable contact 41 is stably contacted with the two stationary contacts 3 on the left side; in the second state, that is, when the movable contact 41 is pre-pressed against the two stationary contacts 3 in the right row (as shown in the position shown in fig. 3), the driving cam mechanism 6 can apply a reverse driving force to the switch yoke 4 when rotating clockwise, so that the switch yoke 4 rotates counterclockwise until the movable contact 41 contacts the two stationary contacts 3 on the right side, as shown in fig. 2 and 3.

Meanwhile, the dead point position of the dead point spring 5 is set between two rest positions where the movable contact 41 is in contact with two rows of the stationary contacts 3, i.e., the dead point spring 5 is compressed to the maximum extent in this interval. This has the result that a force is exerted on the non-operated switch fork 4 which holds the switch fork 4 in one of the rest positions and limits the oscillation of the switch fork 4 in the rest position, ensuring the stability of the contact. Furthermore, after exceeding the dead point, the direction of action of the force exerted by the over-dead-point spring 5 is reversed, and thus the force required for the swing by the switch yoke 4 is reduced, thereby reducing the absolute force consumption. Since the over-dead-center spring has a force profile that linearly adds to the force consumption when the switch yoke 4 is swung, the profile of the pulling force exerted by the drive of the switch yoke 4 is almost linear without irregularities that are considered uncomfortable from an ergonomic point of view.

With continued reference to fig. 1, in the present embodiment, the switch housing 1 may include: a first housing 13 and a second housing (not shown in the figure); the second housing and the first housing 13 are detachably connected in an abutting manner, and the second housing and the first housing 13 enclose a hollow cavity. Specifically, the first housing 13 and the second housing are butted and detachably connected by a connector such as a snap, so that the first housing 13 and the second housing are buckled to form a hollow housing structure, and at least part of components of the isolating switch are included.

With continued reference to fig. 1, 3 and 4, the switch yoke 4 includes: a switch fork body 42, two fork fixing plates 43 and two collision rings 43; wherein the content of the first and second substances,

the switch fork body 42 is rotatably sleeved on the fork rotating shaft 2. Specifically, the switch fork body 42 may be of a sleeve structure, which is rotatably sleeved on the fork rotating shaft 2; one side of the bushing structure can be provided with two parallel supporting plates up and down for supporting the fork fixing plate 43, so that the fork fixing plate 43 can be swingably disposed inside the switch housing 1.

The two shifting fork fixing plates 43 are arranged side by side in the switch shell 1 along the length direction (vertical direction shown in fig. 4) of the switch shifting fork body 42, the connecting ends (right end shown in fig. 4) of the two shifting fork fixing plates 43 are connected to the switch shifting fork body 42, the movable contact 41 is arranged on the two shifting fork fixing plates 43, and the two shifting fork fixing plates 43 swing around the axis of the shifting fork rotating shaft 2 along with the switch shifting fork body 42 so as to drive the movable contact 42 to swing between the two columns of fixed contacts 3. Specifically, two fork fixing plates 43 are disposed at two upper and lower positions of the switch fork body 42 in a flush manner, and as shown in fig. 4, mounting holes 431 are disposed on the two fork fixing plates 43 for inserting and fixing the moving contact 41, so as to fix the moving contact 41.

As shown in fig. 3, the two collision rings 44 are disposed on the switch fork body 41, and the driving cam mechanism 6 applies a positive driving force to one of the collision rings 44, so that the switch fork body 42 drives the two fork fixing plates 43 to rotate clockwise, and further drives the movable contact 41 fixed to the fork fixing plates 43 to swing until it contacts the two left stationary contacts 3; the driving cam mechanism 6 applies a reverse driving force to the other collision ring 41, so that the switch shifting fork body drives the two shifting fork fixing plates to rotate anticlockwise, and further drives the moving contact 41 fixed to the shifting fork fixing plate 43 to swing until the moving contact contacts with the two static contacts 3 on the right side, and the moving contact 41 swings back and forth between the two rows of the static contacts 3. Specifically, the driving cam mechanism 6 applies a forward driving force to the collision ring 44 located at the lower side, so that the collision ring 44 moves along the cam track of the driving cam mechanism 6 under the action of the driving cam mechanism 6 to drive the switch fork 4 to integrally swing clockwise, so that the free side of the movable contact 41 leans against the fixed contact 3 at the left side; the driving cam mechanism 6 applies a reverse driving force to the collision ring 44 located at the upper side, so that the collision ring 44 moves along the cam track of the driving cam mechanism 6 under the action of the driving cam mechanism 6 to drive the switch yoke 4 to integrally swing counterclockwise, so that the movable contact 41 leans to the stationary contact 3 at the right side from the left side.

In the present embodiment, the two collision rings 44 are disposed at an included angle, that is, the two collision rings 44 are disposed in a staggered manner, so that the two collision rings 44 respectively act, that is, respectively contact different positions of the outer contour of the driving cam mechanism 6, so that the two collision rings 44 respectively and independently cooperate with the driving cam mechanism 6, when the driving cam mechanism 6 applies a forward driving force, that is, rotates counterclockwise, one of the collision rings 44, for example, the collision ring 44 on the lower side, contacts with the boss side wall of the driving cam mechanism 6 to move under the action of the boss side wall profile, so that the collision ring 44 gradually moves from the base circle to the boss outer wall, and in this process, the distance between the collision ring 44 and the axis of the switch fork body 42 is shortened, so that the fork fixing plate 43 swings clockwise; when the drive cam mechanism 6 applies a reverse drive force, i.e., rotates clockwise, one of the collision rings 44, for example, the upper collision ring 44, contacts the boss position of the drive cam mechanism 6 to move under the boss working profile, so that the collision ring 44 is gradually displaced from the base circle to the boss outer wall, during which the distance between the collision ring 44 and the axis of the switch yoke body 42 is shortened, so that the yoke fixing plate 43 swings counterclockwise.

With continued reference to fig. 1, to reduce the frictional force between the impact ring 44 and the drive cam mechanism 6, the impact ring 44 preferably includes: impact brace 441 and impact ring body 442; wherein, the impact ring body 442 is rotatably disposed on the impact bracket 441 to roll on the outer wall of the driving cam mechanism 6, reducing the friction force therebetween, and thus reducing the abrasion therebetween.

With continued reference to fig. 4, the movable contact 41 includes: two movable contact terminals 411 and a movable contact connection 412; the two movable contact terminals 411 are respectively inserted into the mounting holes 431 of the two fork fixing plates 43, and contact ends (left ends shown in fig. 4) of the two movable contact terminals 411 are both arranged outside the two fork fixing plates 43 and are used for respectively contacting an upper static contact 3 and a lower static contact 3 in a row of static contacts 3; two ends (upper and lower ends shown in fig. 4) of the movable contact connecting member 412 are respectively connected to connecting ends (right end shown in fig. 4) of the two movable contact terminals 411, so as to connect the two movable contact terminals 411. Specifically, the contact ends of the two moving contact terminals 411 may be U-shaped structures, and are inserted into the upper and lower sides of the static contact 3, so as to realize stable contact between the static contact 3 and the moving contact terminals 411. To achieve the positioning between the movable contact terminal 411 and the yoke fixing plate 43, preferably, the U-shaped structure may be protruded out of the mounting hole 431 and pressed against the end of the yoke fixing plate 43. In order to improve the stability between the contact terminal 411 and the yoke fixing plate 43, preferably, a force application spring (not shown in the figure) is arranged between the movable contact terminal 411 and the yoke fixing plate 43, and is used for applying a force to the movable contact terminal 411, so as to ensure that the movable contact terminal 411 is pressed in the installation hole 431 of the yoke fixing plate 43, so that the movable contact terminal 411 has a certain pre-tightening force, and further the movable contact terminal 411 can be opened at a certain angle under the condition of having a certain pre-tightening force, that is, the movable contact terminal 411 can have a certain buffer space when contacting the static contact 3, and meanwhile, can be restored to the original position in the yoke fixing plate 43 under the action of the force application spring.

With continued reference to fig. 1 and 4, the dead point spring 5 comprises: a spring body 51, a guiding telescopic rod 52 and two connecting parts 53; wherein, the spring body 51 is sleeved on the periphery of the guiding telescopic rod 52, the two connecting parts 53 are respectively arranged at the two ends of the guiding telescopic rod 52, and the two ends of the spring body 51 are respectively connected with the two connecting parts 53 to apply acting force to the connecting parts 53, so that the guiding telescopic rod 52 stretches and retracts accordingly. Specifically, as shown in fig. 1, one of the connecting portions 53 is rotatably fitted over the spring mounting rod 12, and the other connecting portion 53 is rotatably fitted over a connecting rod provided between the two fork fixing plates 43, so as to apply a force to the spring body 51 while the fork fixing plates 43 swing, so that the spring body 51 is compressed and deflected therewith.

With continued reference to fig. 2 to 3, the drive cam mechanism 6 includes: a cam base 61 and two cams 62; the two cams 62 are respectively disposed at two ends (upper and lower ends as shown in fig. 2) of the cam base 61, in the first state, one of the cams 62 applies a forward driving force to the switch fork 4 to make the moving contact 41 contact with one of the rows of the static contacts 3, and in the second state, the other cam 62 applies a reverse driving force to the switch fork 4 to make the moving contact 41 contact with the other row of the static contacts 3. Specifically, the cam base 61 and the two cams 62 are fixedly connected to ensure that the three rotate synchronously. In the present embodiment, at least one boss 621 is provided on each of the two cams 62 along the circumferential direction thereof, and the bosses 621 of the two cams 62 are arranged in a staggered manner, so that when the side wall of the boss 621 of any one cam 62 contacts the impact ring 44 correspondingly provided, the other impact ring 44 is not in contact with the boss 621 of the other cam 62 in a staggered manner. Preferably, the cam 62 may be provided with at least one boss 621 and at least one groove 622, in this embodiment, three bosses 621 and three grooves 622 are taken as an example for description, and contour lines of the bosses 621 and the grooves 622, that is, an outer wall section of the boss 621 and an inner wall section of the groove 622, may be both circular arc sections concentrically arranged with the center of circle of the cam 62, so that when the collision ring 44 is in pressing contact with the contour lines of the bosses 621 and the grooves 622, a distance between the centers of the collision ring 44 and the cam 62 is constant, and then a distance between axes of the collision ring 44 and the fork-pulling rotating shaft 2 is constant, and in this process, the switch fork 4 does not swing.

As shown in fig. 3, in this state, the upper collision ring 44 is in pressing contact with the outer wall of the boss 621 of the upper cam 62, the lower collision ring 44 is in pressing contact with the inner wall of the groove 622 of the lower cam 62, and the movable contact 41 is in contact with the two stationary contacts 3 on the right side; at this time, the movable contact 41 is pre-switched to contact the two fixed contacts 3 on the left side, that is, in the first state, the cam base 61 rotates counterclockwise, so that the side wall of the boss 621 of the lower cam 62 contacts the lower collision ring 44, and applies a forward driving force to the lower collision ring 44 to push the collision ring 44 to swing and press and contact the collision ring 44 on the outer wall of the boss 621 of the cam 62, the collision ring 44 swings to drive the shift fork fixing plate 43 to swing, so that the movable contact 41 swings to the fixed contact 3 on the left side to realize the contact between the movable contact 41 and the two fixed contacts 3 on the left side, and meanwhile, the upper collision ring 44 swings to press and contact the inner wall of the groove 622 of the upper cam 62. In the second state, that is, when the movable contact 41 is pre-pressed against two fixed contacts 3 in a row on the right side (as shown in fig. 3), the cam base 61 rotates counterclockwise, so that the sidewall of the boss 621 of the upper cam 62 contacts the upper collision ring 44, and applies a reverse driving force to the upper collision ring 44 to push the collision ring 44, so that the collision ring swings and presses against the outer wall of the boss 621 of the upper cam 62, and the collision ring 44 swings to drive the fork fixing plate 43 to swing, so that the movable contact 41 swings to the fixed contact 3 on the right side to realize the contact between the movable contact 41 and the two fixed contacts 3 on the right side, and meanwhile, the lower collision ring 44 swings to press against the inner wall of the groove 622 of the lower cam 62, as shown in fig. 3.

With continued reference to fig. 5, the locking buckle 7 comprises: a locking buckle body 71 and a buffer spring 72; the middle position of the locking buckle body 71 is rotatably connected to a side wall (such as a right side wall shown in fig. 5) of the static contact 3, and is used for forming a swing lever structure on the static contact 3, so that the locking buckle body 71 swings under the action of the movable contact 41 when the movable contact 41 is close to the static contact 3; the buffer spring 72 is disposed at an end (a lower end as shown in fig. 5) of the static contact 3 opposite to the moving contact 41, and is configured to apply a buffer force to the locking buckle body 71, so that the locking buckle body 71 buffers the rotation of the moving contact 41, and the moving contact is slowly close to the static contact 3. Specifically, two ends of the locking buckle body 71 can be respectively provided with a contact part 711 and a pressing part 712, the contact part 711 is used for contacting the movable contact 41 or the fork fixing plate 43 so as to bear an acting force applied by the movable contact 41 or the fork fixing plate 43, and can apply a buffering action to the movable contact 41 to realize vibration reduction; the pressing portion 712 is configured to apply a lateral pressing force to the stationary contact 3 when the locking buckle body 71 swings clockwise, so as to apply a lateral pressing force to the buffer spring 72, so that the buffer spring 72 buffers the pressing portion 712, and further, the movable contact 41 is buffered by the locking buckle body 71. In this embodiment, the contact portion 711 may be a cylinder structure, or may be other structures, which is not limited in this embodiment; when the movable contact 41 swings in place, the movable contact 41 contacts with the contact part 711, so that the locking buckle body 71 swings clockwise, the pressing part 712 applies pressure to the buffer spring 72, the buffer spring 72 buffers the swing of the locking buckle body 71, and the movable contact 41 is buffered by the locking buckle body 71, so that the movable contact 41 slowly approaches the static contact 3.

The working process of the isolating switch of the on-load tap-changer is as follows:

the cam base 61 can be driven to rotate clockwise and anticlockwise, the cam base 61 can drive the upper cam 62 and the lower cam 62 which are installed on the cam base 61 to synchronously rotate in the rotating process, the upper cam 62 corresponds to the upper collision ring 44, the lower cam 62 corresponds to the lower collision ring 44, and the bosses 621 of the upper cam 62 and the lower cam 62 have a certain angle difference, so that the cam 62 can collide with the upper collision ring 44 or the lower collision ring 44 in the reciprocating rotating process, and further the switch fork 4 is driven to swing; the switch shifting fork 4 can drive the moving contact 41 to rotate when swinging, and the moving contact 41 can communicate the first fixed contact 31 with the third fixed contact 33 or communicate the second fixed contact 32 with the fourth fixed contact 34 along with the swinging of the switch shifting fork 4, namely, the switching of the switch is realized; after the moving contact 41 swings in place, the locking buckles 7 on the four fixed contacts 3 and the shifting fork fixing plate 43 on the switch shifting fork 4 act together, so that the moving contact 41 is stabilized at the corresponding position, and the stability of the structure is ensured.

In summary, in the on-load tap-changer isolation switch provided in this embodiment, the switch housing 1 is used to load part of the components of the isolation switch, so as to avoid external interference with the normal operation of the isolation switch, and meanwhile, the isolation switch as an integral switch structure can be installed and designed as an independent component, thereby facilitating the overall modular design of the tap-changer; the switch shifting fork 4 is rotatably connected to the shifting fork rotating shaft 2, so that the switch shifting fork 4 can swing and drive the moving contact 41 to be in switching contact with the two rows of static contacts 3, and the transition on-off time sequence of the vacuum bubbles is controlled; meanwhile, the dead point position of the dead point spring 5 is arranged between two static positions where the moving contact 41 is contacted with the two rows of static contacts 3, namely, the dead point spring 5 is compressed to the maximum extent in the interval, so that the switch shifting fork 4 can be pressed to the static positions, the moving contact 41 is ensured to be stably and firmly contacted with the two rows of static contacts 3, the electrical characteristics are reliable, and the problem that the service life of the switch is obviously influenced due to the fact that the existing clip type isolating switch has large sliding friction is solved.

Furthermore, the double-layer cam reciprocating switching method is adopted, the asymmetric time sequence switching of the electric circuit can be realized, meanwhile, the locking buckle arranged on the static contact can further ensure the stable and compact contact of the conductive contact after the structure is switched in place, and the electric characteristics are reliable.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. An on-load tap changer disconnector, comprising:

a switch housing;

the shifting fork rotating shaft is arranged in the switch shell;

the four static contacts are arranged in the switch shell in two layers and two rows;

one end of the switch shifting fork is rotatably arranged on the shifting fork rotating shaft, and the other end of the switch shifting fork is provided with a moving contact which swings along with the switch shifting fork and is switched to be in on-off contact with the two rows of static contacts so as to control the transition on-off time sequence of the vacuum bubbles;

the dead point spring is arranged between two static positions where the moving contact is contacted with two rows of static contacts, is compressed to the maximum degree at the dead point position, and exerts the maximum acting force on the switch pulling fork so as to press the switch pulling fork to the static position.

2. The on-load tap changer of claim 1, wherein the switch yoke comprises:

the switch shifting fork body is rotatably sleeved on the shifting fork rotating shaft;

the two shifting fork fixing plates are arranged in the switch shell side by side along the length direction of the switch shifting fork body, the connecting ends of the two shifting fork fixing plates are connected to the switch shifting fork body, the moving contact is arranged on the two shifting fork fixing plates, and the two shifting fork fixing plates swing around the axis of the shifting fork rotating shaft along with the switch shifting fork body so as to drive the moving contact to swing between two rows of fixed contacts;

the switch shifting fork comprises a switch shifting fork body, two collision rings, an included angle is formed between the two collision rings, the two collision rings are used for enabling one of the collision rings to be in contact with a driving cam mechanism and driving two shifting fork fixing plates to swing under the action of the driving cam mechanism so that the movable contact swings to be in contact with one row of static contacts when the driving cam mechanism applies a reverse driving force, and the other collision ring is in contact with the driving cam mechanism and drives the two shifting fork fixing plates to swing under the action of the driving cam mechanism so that the movable contact swings to be in contact with the other row of static contacts when the driving cam mechanism applies a forward driving force.

3. The on-load tap changer of claim 2, wherein the movable contact comprises:

the two moving contact terminals are respectively inserted into the mounting holes of the two shifting fork fixing plates, and contact ends of the two moving contact terminals are arranged outside the two shifting fork fixing plates and are used for respectively contacting two static contacts in a row of static contacts; a force application spring is arranged between the moving contact terminal and the shifting fork fixing plate and is used for applying acting force to the moving contact terminal so as to ensure that the moving contact terminal is in pressure joint with the shifting fork fixing plate;

and two ends of the moving contact connecting piece are respectively connected with the connecting ends of the two moving contact terminals so as to realize the connection of the two moving contact terminals.

4. The on-load tap changer of any one of claims 1 to 3, further comprising:

and the power output end of the driving cam mechanism is in transmission connection with the switch shifting fork and is used for applying driving force to the switch shifting fork so as to enable the switch shifting fork to swing back and forth around the axis of the shifting fork rotating shaft, so that the moving contact is in switching contact with the two rows of static contacts to control the transition on-off time sequence of the vacuum bubbles.

5. The on-load tap changer of claim 4, wherein the drive cam mechanism comprises:

a cam base;

and the two cams are respectively arranged at two ends of the cam base, one cam applies a forward driving force to the switch pulling fork in a first state so that the movable contact is contacted with one row of static contacts, and the other cam applies a reverse driving force to the switch pulling fork in a second state so that the movable contact is contacted with the other row of static contacts.

6. The on-load tap changer disconnector of claim 5,

at least one boss is arranged on each of the two cams along the circumferential direction of the two cams, and the bosses of the two cams are arranged in a staggered mode, so that when the boss of any one cam contacts the corresponding collision ring, the other collision ring is not contacted with the boss of the other cam in a staggered mode;

when the cam base rotates anticlockwise, the side wall of the boss of one cam contacts with the collision ring corresponding to the cam, and the collision ring is pushed to be in abutting contact with the outer wall of the boss of the cam, so that the moving contact rotates to be in contact with one row of static contacts;

when the cam base rotates clockwise, the side wall of the boss of the other cam contacts the collision ring corresponding to the cam, and the collision ring is pushed to be in abutting contact with the outer wall of the boss of the cam, so that the moving contact rotates to contact with the other row of static contacts.

7. On-load tap changer disconnector according to any one of claims 1 to 3,

and each static contact is provided with a locking buckle for buffering the moving contact when the moving contact contacts the static contact.

8. The on-load tap changer of claim 7, wherein the locking catch comprises:

the middle position of the locking buckle body is rotatably connected to the side wall of the static contact and is used for forming a swing lever structure on the static contact so as to swing under the action of the moving contact when the moving contact abuts against the static contact;

and the buffer spring is arranged at the end part of the static contact, which is opposite to the moving contact, and is used for applying a buffer force to the locking buckle body so that the locking buckle body buffers the rotation of the moving contact and the moving contact is slowly close to the static contact.

9. The on-load tap changer of any one of claims 1 to 3, wherein the switch housing comprises:

a first housing;

the second shell is detachably butted with the first shell, and the second shell and the first shell are surrounded to form a hollow cavity.

10. On-load tap changer disconnector according to any one of claims 1 to 3,

two limiting rods are arranged in the switch shell and used for respectively limiting the positions of two end parts of the swing stroke of the switch shifting fork so as to limit the swing angle of the switch shifting fork.

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