An isolated contact and a vacuum on-load tap changer having the same

Abstract

This invention provides an isolating contact and a vacuum on-load tap changer having the isolating contact. The isolating contact includes: a switch housing, a drive cam assembly, and a transmission mechanism; wherein, two stationary contacts are provided on both the first and second sides of the switch housing; the power input end of the transmission mechanism is connected to the drive cam assembly, the power output end of the transmission mechanism is located inside the switch housing, and a moving contact is provided on the power output end of the transmission mechanism. This invention converts the rotation of the drive cam assembly into the oscillation of the moving contact, resulting in a smaller space occupation compared to other isolating switches that move within the cam plane, making the structure more compact and solving the problem of large space occupation in existing isolating contacts.

Description

Technical Field

[0001] This invention relates to the field of on-load tap changer technology, and more specifically, to an isolation contact and a vacuum on-load tap changer having the isolation contact. Background Technology

[0002] Vacuum on-load tap changers are important switching devices for voltage level regulation in ultra-high voltage direct current transmission. They are specialized switching switches that can switch the primary and secondary windings and regulate the output voltage under transformer load.

[0003] An isolating contact is a switching interface in a vacuum on-load tap changer, used in conjunction with a vacuum bulb to control the electrical sequence. Isolating contacts have various structures and no fixed form. However, because ultra-high voltage vacuum on-load tap changers require short switching times and numerous switching actions, isolating contacts are mostly purely mechanical structures, using a designed camshaft to work with other contact switches to achieve timing control. Currently available isolating contacts often use spring clips, rocker arms, or other structures in conjunction with a cam for timing control, resulting in a relatively large space requirement. Summary of the Invention

[0004] In view of this, the present invention proposes an isolation contact and a vacuum on-load tap changer having the isolation contact, aiming to solve the problem of large space occupation of existing isolation contacts.

[0005] On one hand, the present invention proposes an isolation contact, which includes: a switch housing, a drive cam assembly, and a transmission mechanism; wherein, the first and second sides of the switch housing are each provided with two stationary contacts for connecting different contacts; the power input end of the transmission mechanism is connected to the drive cam assembly, the power output end of the transmission mechanism is disposed inside the switch housing, and the power output end of the transmission mechanism is provided with a moving contact, which, under the drive of the drive cam assembly, converts the rotation of the drive cam assembly into the reciprocating swing of the moving contact, so that it swings to the first side of the switch housing to contact and connect with the two stationary contacts on the first side, thereby realizing the connection between the two stationary contacts on the first side, or swings to the second side of the switch housing to contact and connect with the two stationary contacts on the second side, thereby realizing the connection between the two stationary contacts on the second side, and thus realizing switch switching.

[0006] Furthermore, in the aforementioned isolating contact, the transmission mechanism includes: a switch actuating assembly and a helical transmission assembly; wherein, the power input end of the switch actuating assembly is connected to the drive cam assembly, and is used to perform reciprocating linear motion under the action of the drive cam assembly; the power input end of the helical transmission assembly is threadedly connected to the power output end of the switch actuating assembly, and the power output end of the helical transmission assembly is connected to the moving contact, and is used to convert the reciprocating linear motion of the switch actuating assembly into the reciprocating oscillation of the moving contact.

[0007] Furthermore, in the aforementioned isolating contact, the switch actuation assembly includes a push rod and a pull pin; wherein the pull pin is disposed on the push rod, and the pull pin cooperates with the drive groove to provide power input to the pull pin when the drive groove rotates with the drive cam assembly, so that the pull pin performs reciprocating linear motion, thereby driving the push rod to perform synchronous reciprocating linear motion with the pull pin.

[0008] Furthermore, the aforementioned isolating contact, the switch actuation assembly further includes: a guide pin; wherein the guide pin is disposed on the push rod and is used to connect the helical transmission assembly.

[0009] Further, in the aforementioned isolating contact, the helical transmission assembly includes: a fork and a transmission sleeve; wherein, one end of the fork is connected to the transmission sleeve, and the other end of the fork is connected to the moving contact; the transmission sleeve is rotatably sleeved on the push rod, and the transmission sleeve is also provided with a helical groove, which cooperates with the guide pin, for the transmission sleeve to swing around the axis of the push rod when the guide pin reciprocates linearly, thereby driving the fork and the moving contact to swing with the transmission sleeve; both ends of the push rod are provided with limiting plates arranged perpendicular to the axial direction of the push rod, one of the limiting plates is provided with a connecting plate arranged at an angle to the limiting plate, and the pin is disposed on the connecting plate.

[0010] Furthermore, the aforementioned isolating contact also includes a guide rod between the two limiting plates, which is arranged parallel to and spaced apart from the push rod to guide the reciprocating movement of the push rod.

[0011] Furthermore, the aforementioned isolating contact, the transmission mechanism further includes: a movable base; wherein the movable base is installed inside the switch housing, and the switch actuating assembly is slidably disposed on the movable base, the movable base being used to support and guide the reciprocating linear motion of the switch actuating assembly.

[0012] Furthermore, in the aforementioned isolating contact, the outer periphery of the drive cam assembly is provided with a drive groove, which is arranged along the variable diameter outer contour line of the drive cam assembly.

[0013] Furthermore, in the aforementioned isolating contact, the driving cam assembly includes: two stacked cam disks; wherein the two cam disks are coaxially arranged, and the outer contours of the two cam disks are flush; a limiting groove is provided at the outer contour of the variable diameter of the two cam disks, and the two limiting grooves are arranged opposite each other to form a driving groove.

[0014] Furthermore, the aforementioned isolating contact is provided with the two limiting grooves spaced apart to form a drive groove with an opening, so that the power input end of the transmission mechanism extends into the interior of the limiting groove from the opening.

[0015] On the other hand, the present invention also proposes a vacuum on-load tap changer, which is provided with the above-mentioned isolation contact.

[0016] The present invention provides an isolating contact and a vacuum on-load tap changer having the isolating contact. By driving a cam assembly to input power to the power input end of a transmission mechanism, the rotation of the cam assembly is converted into the reciprocating oscillation of a moving contact. This oscillation allows the moving contact to contact a pair of stationary contacts on the first side of the switch housing, achieving communication between the two stationary contacts and thus establishing conductivity between the two points connected by the pair of stationary contacts on the first side. Alternatively, the moving contact can oscillate to the second side of the switch housing, contacting a pair of stationary contacts on the second side, achieving communication between the two stationary contacts and thus establishing conductivity between the two points connected by the pair of stationary contacts on the second side. This enables the switching of the vacuum on-load tap changer, achieving mechanical timing coordination and electrical switching potential isolation. It can be used in tap changers to cooperate with vacuum bulbs and other switch contacts for electrical switching control and ensure correct switching timing. Meanwhile, this isolating contact converts the rotation of the drive cam assembly into the oscillation of the moving contact. Compared with other isolating switches that move within the cam plane, it occupies less space and has a more compact structure, solving the problem of large space occupation of existing isolating contacts. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the isolation contact provided in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the isolation contact without a drive cam assembly provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the transmission mechanism provided in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the switch driving component provided in an embodiment of the present invention. Detailed Implementation

[0022] Exemplary embodiments of the present disclosure will now be described in more detail 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 implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Example of an isolation contact:

[0024] See Figures 1 to 2 The figure illustrates a preferred structure of the isolation contact provided in an embodiment of the present invention. As shown, the isolation contact includes: a switch housing 1, a drive cam assembly 2, and a transmission mechanism 3; wherein,

[0025] The first side of the switch housing 1 (e.g.) Figure 2 (as shown on the left) and the second side (as shown on the right) Figure 2 (As shown on the right) Each side is provided with two stationary contacts 4 for connecting different contacts. Specifically, a total of four stationary contacts 4 are provided on the switch housing 1, in pairs. The four stationary contacts are the first stationary contact 401, the second stationary contact 402, the third stationary contact 403, and the fourth stationary contact 404. The first stationary contact 401 and the second stationary contact 402 are opposite each other and diagonally arranged on the first side of the switch housing 1, and the third stationary contact 403 and the fourth stationary contact 404 are opposite each other and diagonally arranged on the second side of the switch housing 1. That is, the four stationary contacts 4 are arranged diagonally in pairs on the switch housing 1. In this embodiment, each stationary contact 4 is partially disposed inside the switch housing 1 to connect to the moving contact located inside the switch housing 1, while the remaining portion is disposed outside the switch housing 1 to connect to the contact point. Simultaneously, the internal placement of the moving contact prevents external interference or disruption of the switch switching. The four stationary contacts 4 can each connect to different contact points; specifically, the two contact points connected to the two stationary contacts 4 on the first side correspond to each other, and the two contact points connected to the two stationary contacts 4 on the second side also correspond to each other. In this embodiment, each stationary contact 4 can adopt a clip-on structure, meaning that the end of the stationary contact 4 located inside the switch housing 1 is provided with a clip 41 for contacting and connecting to the moving contact 5.

[0026] The power input end of the transmission mechanism 3 is connected to the drive cam assembly 2. The power output end of the transmission mechanism 3 is equipped with a moving contact 5, which, under the drive of the drive cam assembly 2, converts the rotation of the drive cam assembly 2 into the reciprocating swing of the moving contact 5. This allows the contact 5 to swing to the first side, connecting the two stationary contacts 4 on the first side, or to the second side, connecting the two stationary contacts 4 on the second side, thereby achieving switch switching. Specifically, the power input end of the transmission mechanism 3 is connected to the drive cam assembly 2. When the drive cam disk 2 rotates, the transmission mechanism 3 converts the rotation of the drive cam assembly 2 into the reciprocating swing of the moving contact 5. For example, it can be... Figure 2 The moving contact 5 can be rotated clockwise or counterclockwise to swing to the first side of the switch housing 1 and connect with a pair of stationary contacts 4 provided on the first side. That is, both ends of the moving contact 5 connect with the clips 41 of the first stationary contact 401 and the second stationary contact 402 respectively, thereby achieving communication between the first stationary contact 401 and the second stationary contact 402, and thus achieving conduction between the two contacts connected by the first stationary contact 401 and the second stationary contact 402; or it can swing to the second side of the switch housing 1 and connect with a pair of stationary contacts 4 provided on the second side. The two ends of contact 5 are respectively connected to the clips 41 of the third stationary contact 403 and the fourth stationary contact 404 to achieve communication between the third stationary contact 403 and the fourth stationary contact 404, thereby achieving conduction between the two contacts connected by the third stationary contact 403 and the fourth stationary contact 404. That is, it can switch from conduction between the two contacts connected by the first stationary contact 401 and the second stationary contact 402 to conduction between the two contacts connected by the third stationary contact 403 and the fourth stationary contact 404, thus realizing the switching of the vacuum on-load tap changer. In this embodiment, the moving contact 5 swings in a first plane, and the first plane is parallel to the axis of the drive cam group 2.

[0027] In this embodiment, a drive groove 21 is provided on the outer periphery of the drive cam assembly 2, which is arranged along the variable diameter outer contour line of the drive cam assembly 2. Specifically, the outer contour line of the drive cam assembly 2 has a variable diameter contour segment as the variable diameter outer contour line, and a drive groove 21 can be provided at this variable diameter outer contour line so that the distance between one end of the drive groove 21 and the axis of the drive cam assembly 4 gradually increases or decreases; wherein, the power input end of the transmission mechanism 3 cooperates with the drive groove 21 to realize the driving of the power input end of the transmission mechanism 3. In this embodiment, the drive cam assembly 2 has at least three variable diameter outer contour lines, and the outer periphery of the drive cam assembly 2 is provided with three drive grooves 21, all of which are arranged along the variable diameter outer contour line of the drive cam assembly 2; wherein, the switch housing 1 and the four stationary contacts 4 and other components provided thereon, as well as the screw transmission mechanism 3, can be combined to form a one-phase switch switching system, and the drive grooves 21 can provide power to one phase switch switching system respectively, that is, in this embodiment, the three drive grooves 21 can drive the three-phase switch switching system to switch. Of course, in other embodiments, the number of drive slots 21 may also be different, and this embodiment does not limit them in any way. The drive cam assembly 2 is disposed outside the switch housing 1 so as to drive the multi-phase switch switching system and further reduce the space occupied by the on-load tap changer.

[0028] See also Figure 1 The switch housing 1 includes two housings that are detachably connected. Specifically, the switch housing 1 can be divided into two symmetrical left and right halves, namely a left housing 11 and a right housing 12, which are arranged opposite each other to form a hollow housing structure. The left housing 11 and the right housing 12 can be detachably connected by bolt assembly, or they can be connected by other means. This embodiment does not limit the connection.

[0029] See also Figure 1The drive cam assembly 2 includes two stacked cam disks 22; wherein the two cam disks 22 are coaxially arranged and the outer contours of the two cam disks 22 are flush; each of the two cam disks 22 has a limiting groove 221 at the outer contour of the variable diameter, and the two limiting grooves 221 are arranged opposite each other to form a drive groove 21. Specifically, the two cam disks 22 can be an upper cam disk 2201 and a lower cam disk 2202, both of which can be cam structures and are placed symmetrically and coaxially. In this embodiment, the upper cam disk 2201 and the lower cam disk 2202 can be connected by a protrusion and a groove to allow the upper cam disk 2201 and the lower cam disk 2202 to rotate synchronously. At the same time, the upper cam disk 2201 or the lower cam disk 2202 can be connected to a drive shaft (not shown in the figure) for connecting a drive motor to drive the upper cam disk 2201 and the lower cam disk 2202 to rotate synchronously, thereby causing the two limiting grooves 221 provided on the upper cam disk 2201 and the lower cam disk 2202 to rotate synchronously, thereby providing power input to the power input end of the transmission mechanism 3. Both the upper cam disk 2201 and the lower cam disk 2202 have limiting plates 222 extending along their outer contour lines. Limiting grooves 221 are formed on the limiting plates 222 along the outer contour lines of the upper cam disk 2201 and the lower cam disk 2202. The limiting grooves 221 on the upper cam disk 2201 open downwards, while the limiting grooves 221 on the lower cam disk 2202 open upwards. Furthermore, there is a gap between the limiting plates 222 on the upper cam disk 2201 and the lower cam disk 2202. The interval setting, i.e., the gap, forms a drive groove 21 with an opening between the limiting groove 221 on the upper cam disk 2201 and the limiting groove 221 on the lower cam disk 2202. This allows the power input end of the transmission mechanism 3 to extend into the limiting groove 221 from the gap between the two, i.e., the opening of the drive groove 21. The two limiting grooves 221 cooperate with the power input end of the transmission mechanism 3 to drive the transmission mechanism 3 to move, thereby causing the moving contact 5 to swing and complete the contact switching.

[0030] See also Figure 2 and Figure 3 The transmission mechanism 3 includes: a switch actuation assembly 31 and a screw drive assembly 32; wherein, the power input end of the switch actuation assembly 31 (e.g., ...) Figure 1 The right end (shown) is connected to the drive groove 21 and is used to perform reciprocating linear motion under the action of the drive groove 21; the power output end of the screw drive assembly 32 is threadedly connected to the power input end of the switch push assembly 31, and the power output end of the screw drive assembly 32 is connected to the moving contact 5, which is used to convert the reciprocating linear motion of the switch push assembly 31 into the reciprocating oscillation of the moving contact 5; wherein, the moving contact 5 performs reciprocating linear motion in a plane perpendicular to the direction of the reciprocating linear motion of the switch push assembly 31.

[0031] Specifically, the switch actuating assembly 31 is slidably disposed within the switch housing 1. The power input end of the switch actuating assembly 31 is located outside the switch housing 1 and is connected to the drive groove 21. When the drive cam assembly 2 rotates, the drive cam assembly 2 drives the drive groove 21 to rotate synchronously, thereby causing the drive groove 21 to input power to the power input end of the switch actuating assembly 31, causing the switch actuating assembly 31 to perform reciprocating linear motion. The screw drive assembly 32 is disposed inside the switch housing 1, and the power output end of the screw drive assembly 32 is threadedly connected to the power input end of the switch actuating assembly 31. The power output end of the screw drive assembly 32 is connected to the moving contact 5, so as to convert the reciprocating linear motion of the switch actuating assembly 31 into the reciprocating oscillation of the moving contact 5. Furthermore, the moving contact 5 performs reciprocating linear motion in a plane perpendicular to the direction of the reciprocating linear motion of the switch actuating assembly 31.

[0032] For example, when the drive cam group 2 rotates counterclockwise (relative to...) Figure 1 When the position shown is reached, the drive groove 21 rotates counterclockwise with the drive cam group 2, causing the switch push assembly 31 to move linearly to the right. The screw drive assembly 32 can convert the linear motion of the switch push assembly 31 to the right into the counterclockwise swing of the moving contact 5, so that the moving contact 5 can swing from the second side of the switch housing 1 to the first side of the switch housing 1, thereby making the two contacts connected by the third stationary contact 403 and the fourth stationary contact conductive, switching to the first stationary contact 401 and the second stationary contact 404. The two contacts connected by the stationary contact 402 are connected; of course, when the drive cam group 2 rotates clockwise, the movement direction of the switch push assembly 31, the screw drive assembly 32 and the moving contact 5 is opposite to the movement when the drive cam group 2 rotates counterclockwise, which allows the moving contact to swing from the first side of the switch housing 1 to the second side of the switch housing 1, and then connect between the two contacts connected by the first stationary contact 401 and the second stationary contact 402, and switch to connect between the two contacts connected by the third stationary contact 403 and the fourth stationary contact 404.

[0033] See also Figure 2 and Figure 3The transmission mechanism further includes a movable base 33; wherein the movable base 33 is installed inside the switch housing 1, and the switch actuating assembly 31 is slidably disposed on the movable base 33, the movable base 33 being used to support and guide the switch actuating assembly 31. Specifically, the movable base 33 can be fixedly installed inside the switch housing 1 by a bolt assembly, especially by a bolt assembly used to connect the left housing 11 and the right housing 12, in order to simplify the isolation contact structure. The switch actuating assembly 31 is slidably disposed on the switch housing 1 and the movable base 33, and the screw drive assembly 32 is rotatably mounted on the movable base 33. The movable base 33 provides movable support for the switch actuating assembly 31 and the screw drive assembly 32, thereby providing movable support for the swing of the moving contact 5, allowing the moving contact 5 to swing along a preset circumferential path.

[0034] See Figure 4 This is a schematic diagram of the structure of the switch pushing assembly provided in an embodiment of the present invention. As shown in the figure, the switch pushing assembly 31 includes: a push rod 311, a pull pin 312, and a guide pull pin 313; wherein, the pull pin 312 is disposed on the push rod 311, and the pull pin 312 cooperates with the drive groove 21 to provide power input to the pull pin 312 when the drive groove 21 rotates with the drive cam assembly 2, so that the pull pin 312 performs reciprocating linear motion, thereby driving the push rod 311 to perform synchronous reciprocating linear motion with the pull pin 312; the guide pull pin 313 is disposed on the push rod 311 and is used to connect to the screw transmission assembly 32 to apply power to the screw transmission assembly 32. Specifically, the push rod 311 is a straight round rod structure, which slidably passes through the switch housing 1 and the moving base 33. The pull pin 312 is set on the push rod 311 and can serve as the power input end of the switch push assembly 31. In conjunction with the drive groove 21, it realizes the input of power, thereby causing the push rod 311 to perform reciprocating linear motion, which in turn causes the guide pull pin 313 to perform reciprocating linear motion accordingly. The push rod 311 guides the reciprocating linear motion, ensuring the direction of the reciprocating linear motion of the switch push assembly 311. The guide pull pin 313 can be set radially on the push rod 311. The guide pull pin 313 serves as the power output end of the switch push assembly 311 and is connected to the power output end of the screw transmission assembly 32, so that the screw transmission assembly 32 converts the reciprocating linear motion of the guide pull pin 313 into the oscillation of the moving contact 5. The guide pin 313 can be inserted into the push rod 311, that is, both ends are respectively set on both sides of the push rod 311, so as to be connected to the screw transmission assembly 32 to ensure the stability of power transmission.

[0035] In this embodiment, as Figure 4 As shown, the two ends of the push rod 311 (such as...) Figure 4Both the left and right ends shown are provided with limiting plates 314 arranged along the axis perpendicular to the push rod 311, one of the limiting plates 314 (e.g., Figure 4 The left-side limiting plate 314 shown is provided with a connecting plate 315 set at an angle to the limiting plate 314, and the pull pin 312 is disposed on the connecting plate 315. Specifically, the two limiting plates 314 can limit the two end positions of the push rod 311 reciprocating linear motion relative to the switch housing 1; the connecting plate 315 can be set perpendicular to the limiting plate 314 to support the pull pin 312, so that the pull pin 312 can be set perpendicular to the connecting plate 315 and installed on the connecting plate 315, and the connecting plate 315 can extend into the opening of the drive groove 21 so that the pull pin 312 can be slidably installed inside the drive groove 21. In this embodiment, there can be two pull pins 312, namely an upper pull pin 31201 and a lower pull pin 31202, and the two pull pins 312 are respectively disposed on both sides of the connecting plate 315 (e.g., Figure 4 The upper and lower sides (as shown) are slidably set in two limiting grooves 221 to improve the stability of the power input of the drive cam disk 2 to the switch push assembly 31; the drive cam assembly 2 and the pin 312 adopt a geometric closed fit, and the pin 312 is simultaneously constrained in both directions. Therefore, during the switching process, it has the characteristic of smaller jump compared to the currently more common spring-type disconnect switches, effectively avoiding switch arcing, ensuring reliable electrical characteristics, guaranteeing the switching sequence of the on-load tap changer, and improving the overall technical life of the tap changer.

[0036] See also Figure 4 A guide rod 316 is also provided between the two limiting plates 314, which is arranged parallel to and spaced apart from the push rod 311 to guide the reciprocating motion of the push rod 311. Specifically, the two ends of the guide rod 316 are respectively connected to the two limiting plates 315, and the guide rod can also slide through the switch housing 1 and the moving base 33, which can realize secondary guidance for the reciprocating linear motion of the switch push assembly 31, and further ensure the stability of the reciprocating linear motion of the switch push assembly 31.

[0037] See also Figure 3 The screw drive assembly 32 includes: a shift fork 321 and a drive sleeve 322; wherein, one end of the shift fork 321 (e.g., Figure 3 The lower end shown is connected to the transmission sleeve 322, and the other end of the shift fork 321 (as shown) is connected to the transmission sleeve 322. Figure 3The upper end shown is connected to the moving contact 5; the transmission sleeve 322 is rotatably sleeved on the push rod 311, and the transmission sleeve 322 is also provided with a spiral groove 3221, which cooperates with the guide pin 313. When the guide pin 313 reciprocates linearly, the transmission sleeve 322 swings around the axis of the push rod 311, thereby driving the fork 321 and the moving contact 5 to swing with the transmission sleeve 322, thereby realizing the switch switching. Specifically, the transmission sleeve 322 is provided with a spiral groove 3221. The spiral groove 3221 is a spiral groove structure opened along the circumference of the transmission sleeve 322. The pitch of the spiral groove 3221 is adapted to the stroke of the reciprocating linear motion of the guide pin 313, and the central angle of the spiral groove 3221 is adapted to the swing angle of the moving contact 5. That is to say, the pitch of the spiral groove 3221 can be determined based on the stroke of the reciprocating linear motion of the guide pin 313, and the central angle of the spiral groove 3221 can be determined based on the swing angle of the moving contact 5. Among them, the spiral groove 3221 and the guide pin 313 are adapted to the stroke of the reciprocating linear motion of the guide pin 313. The pull pins 313 are connected to form a helical transmission connection structure, similar in principle to the transmission connection principle in a ball screw pair. The guide pull pins 313, following the reciprocating linear motion of the push rod 311, are converted into the rotation of the transmission sleeve 322 around the axis of the push rod 311. The fork 321 is radially arranged along the transmission sleeve 322, and rotates with the transmission sleeve 322, thereby causing the moving contact 5 to swing around the axis of the push rod 311, and thus swing between the first and second sides of the switch housing 1, thereby achieving switch switching. In other words, the preset circumferential path is a circular path with the axis of the push rod 311 as the center and the distance between the moving contact 5 and the axis of the push rod 311 as the radius.

[0038] It can be seen that the screw drive assembly 32 is a cam-controlled fork structure, which is installed in the symmetrical switch housing 1 and can be assembled as a modular component in the vacuum on-load tap changer.

[0039] See also Figure 3 The moving base 33 may include two spaced and parallel base bodies 331; wherein the two base bodies 331 are sandwiched on both sides of the screw drive assembly 32, which can limit the screw drive assembly 32, especially the transmission sleeve 322, to prevent the transmission sleeve 322 from moving along the axial direction of the push rod 311, thereby ensuring the stability of the screw drive connection structure between the screw groove 3221 and the guide pin 313, and ensuring that the moving contact 5 can swing. In order to provide long-distance guidance for the reciprocating linear motion of the switch push assembly 31, preferably, a guide sleeve 332 may also be provided between the two base bodies 331, and the guide rod 316 is slidably inserted through the guide sleeve 332.

[0040] In summary, the isolating contact provided in this embodiment provides power input to the power input end of the transmission mechanism 3 through the driving cam group 2. Under the drive of the transmission mechanism 3, the rotation of the driving cam group 2 is converted into the reciprocating swing of the moving contact 5. The moving contact 5 swings to the first side of the switch housing 1 and contacts and connects with a pair of stationary contacts 4 provided on the first side, thereby achieving communication between the pair of stationary contacts 4 provided on the first side and thus achieving conduction between the two contacts connected by the pair of stationary contacts 4 provided on the first side; or it swings to the second side of the switch housing 1 and contacts and connects with a pair of stationary contacts 4 provided on the second side, thereby achieving communication between the pair of stationary contacts 4 provided on the second side and thus achieving conduction between the two contacts connected by the pair of stationary contacts 4 provided on the second side, realizing the switching of the vacuum on-load tap changer. That is, it realizes the mechanical timing coordination and electrical switching potential isolation of the on-load tap changer. It can be used in the tap changer to cooperate with switch contacts such as vacuum bulbs for electrical switching control and ensure the correct switching timing. Meanwhile, this isolating contact converts the rotation of the drive cam group 2 into the oscillation of the moving contact in a plane parallel to the axis of the drive cam group 2. Compared with other isolating switches that move in the cam plane, it occupies less space and has a more compact structure, solving the problem of large space occupation of existing isolating contacts.

[0041] Example of a vacuum on-load tap changer:

[0042] This embodiment also proposes a vacuum on-load tap changer, which is equipped with the aforementioned isolating contact. The specific implementation process of the isolating contact is described above and will not be repeated here.

[0043] Because the isolating contact has the aforementioned effects, the vacuum on-load tap changer body with the isolating contact also has the corresponding technical effects.

[0044] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0045] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An isolation contact, characterized in that, include: The switch housing, drive cam assembly, and transmission mechanism; among which, The first and second sides of the switch housing are each provided with two stationary contacts for connecting different contacts. The power input end of the transmission mechanism is connected to the drive cam group, and the power output end of the transmission mechanism is provided with a moving contact, which is used to convert the rotation of the drive cam group into the reciprocating swing of the moving contact under the drive of the drive cam group, so that the moving contact swings to the first side of the switch housing and contacts the two stationary contacts on the first side to realize the connection between the two stationary contacts on the first side, or swings to the second side of the switch housing and contacts the two stationary contacts on the second side to realize the connection between the two stationary contacts on the second side, thereby realizing the switch switching; The transmission mechanism includes: a switch actuation assembly and a screw drive assembly; wherein... The power input end of the switch push component is connected to the drive cam group, and is used to perform reciprocating linear motion under the action of the drive cam group; The power input end of the helical transmission assembly is threadedly connected to the power output end of the switch push assembly, and the power output end of the helical transmission assembly is connected to the moving contact, which is used to convert the reciprocating linear motion of the switch push assembly into the reciprocating oscillation of the moving contact. The outer periphery of the drive cam assembly is provided with a drive groove, which is arranged along the variable diameter outer contour line of the drive cam assembly. The switch actuation assembly includes: a push rod and a pull pin; wherein... The pull pin is mounted on the push rod and engages with the drive groove to provide power input to the pull pin when the drive groove rotates with the drive cam assembly, so that the pull pin performs reciprocating linear motion, thereby driving the push rod to perform synchronous reciprocating linear motion with the pull pin.

2. The isolating contact according to claim 1, characterized in that, The switch actuation assembly further includes: a guide pin; wherein... The guide pin is mounted on the push rod and is used to connect the helical transmission assembly.

3. The isolating contact according to claim 2, characterized in that, The screw drive assembly includes: a shift fork and a drive sleeve; wherein... One end of the fork is connected to the transmission sleeve, and the other end of the fork is connected to the moving contact. The transmission sleeve is rotatably mounted on the push rod, and the transmission sleeve is also provided with a spiral groove, which cooperates with the guide pin, so that when the guide pin reciprocates linearly, the transmission sleeve swings around the axis of the push rod, thereby driving the fork and the moving contact to swing with the transmission sleeve. Both ends of the push rod are provided with limiting plates arranged perpendicular to the axial direction of the push rod. One of the limiting plates is provided with a connecting plate arranged at an angle to the limiting plate, and the pull pin is arranged on the connecting plate.

4. The isolating contact according to claim 3, characterized in that, A guide rod is also provided between the two limiting plates, which is arranged parallel to and spaced apart from the push rod to guide the reciprocating movement of the push rod.

5. The isolating contact according to claim 1, characterized in that, The transmission mechanism further includes: a moving base; wherein... The movable base is installed inside the switch housing, and the switch actuating assembly is slidably disposed on the movable base. The movable base is used to support and guide the reciprocating linear motion of the switch actuating assembly.

6. The isolating contact according to claim 1, characterized in that, The drive cam assembly includes: two stacked cam disks; wherein, The two cam disks are coaxially arranged, and the outer contours of the two cam disks are flush. Each of the two cam disks has a limiting groove at the outer contour of the variable diameter, and the two limiting grooves are arranged opposite each other to form a drive groove.

7. The isolating contact according to claim 6, characterized in that, The two limiting grooves are spaced apart to form a drive groove with an opening, so that the power input end of the transmission mechanism extends into the interior of the limiting groove from the opening.

8. A vacuum on-load tap changer, characterized in that, It is provided with an isolation contact as described in any one of claims 1 to 7.

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