CN116092847A - Isolation contact and vacuum on-load tap switch with same - Google Patents
Isolation contact and vacuum on-load tap switch with same Download PDFInfo
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- CN116092847A CN116092847A CN202210766482.6A CN202210766482A CN116092847A CN 116092847 A CN116092847 A CN 116092847A CN 202210766482 A CN202210766482 A CN 202210766482A CN 116092847 A CN116092847 A CN 116092847A
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- 238000002955 isolation Methods 0.000 title claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 77
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 230000033001 locomotion Effects 0.000 claims description 39
- 238000004891 communication Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- 238000010079 rubber tapping Methods 0.000 description 2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/0005—Tap change devices
- H01H9/0016—Contact arrangements for tap changers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
- H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H3/42—Driving mechanisms, i.e. for transmitting driving force to the contacts using cam or eccentric
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Abstract
The invention provides an isolation contact and a vacuum on-load tap switch with the same. The isolation contact includes: the switch comprises a switch shell, a driving cam group and a transmission mechanism; wherein, the first side and the second side of the switch shell are provided with two fixed contacts; the power input end of the transmission mechanism is in transmission connection with the driving cam group, the power output end of the transmission mechanism is arranged in the switch shell, and the power output end of the transmission mechanism is provided with a moving contact. The invention converts the rotation of the driving cam group into the swing of the moving contact, occupies small space relative to other isolating switches moving in the cam plane, has more compact structure, and solves the problem of large space occupation of the existing isolating contact.
Description
Technical Field
The invention relates to the technical field of on-load tap-changer, in particular to an isolation contact and a vacuum on-load tap-changer with the isolation contact.
Background
The vacuum on-load tap-changer is an important switching device in the aspect of voltage level adjustment in ultra-high voltage direct current transmission, and is a special-purpose switching switch capable of completing tap-changing switching of primary and secondary windings under the condition of load of a transformer and adjusting output voltage.
The isolation contact is a switching interface in the vacuum on-load tap-changer and is used for carrying out on-off control on the electrical time sequence in cooperation with vacuum bubbles. The isolating contact has more structures and no fixed structural form. However, the extra-high voltage vacuum on-load tap-changer requires shorter switching time and more switching actions need to be completed, so that the isolating contacts are mostly of a pure mechanical structure, and timing control is completed through the designed cam shaft and other contact switches. The existing isolating contact mostly adopts structures such as spring clamping pieces, swinging rods and the like to be matched with cams for time sequence control, and the space occupation of the isolating contact is larger.
Disclosure of Invention
In view of the above, the invention provides an isolation contact and a vacuum on-load tap switch with the isolation contact, which aim to solve the problem that the space occupation of the existing isolation contact is large.
In one aspect, the present invention provides an isolation contact comprising: the switch comprises a switch shell, a driving cam group and a transmission mechanism; wherein, the first side and the second side of the switch shell are respectively provided with two static contacts for connecting different contacts; the power input end of the transmission mechanism is in transmission connection with the driving cam group, the power output end of the transmission mechanism is arranged in the switch shell, and a moving contact is arranged on the power output end of the transmission mechanism and used for converting rotation of the driving cam group into reciprocating swing of the moving contact under the driving of the driving cam group, so that the first side of the switch shell is in contact connection with the two fixed contacts on the first side in a swinging manner, communication between the two fixed contacts on the first side is achieved, or the second side of the switch shell is in contact connection with the two fixed contacts on the second side in a swinging manner, communication between the two fixed contacts on the second side is achieved, and switching is achieved.
Further, the isolating contact, the transmission mechanism includes: the switch pushing assembly and the spiral transmission assembly; the power input end of the switch pushing assembly is connected with the driving cam group and used for performing reciprocating linear motion under the action of the driving cam group; the power input end of the screw transmission assembly is in threaded connection with the power output end of the switch pushing assembly, and the power output end of the screw transmission assembly is connected with the moving contact and used for converting the reciprocating linear motion of the switch pushing assembly into reciprocating swing of the moving contact.
Further, the isolating contact, the switch pushing assembly includes: pushing the rod and pulling out the nails; the driving groove is matched with the driving groove, and is used for inputting power to the nail pulling device when the driving groove rotates along with the driving cam group, so that the nail pulling device can conduct reciprocating rectilinear motion, and then the driving rod is driven to conduct synchronous reciprocating rectilinear motion along with the nail pulling device.
Further, the isolating contact, the switch pushing assembly further comprises: guiding and pulling out nails; the guide pulling nails are arranged on the pushing rod and used for being connected with the spiral transmission assembly.
Further, the above-mentioned isolation contact, the screw drive assembly includes: shifting fork and driving sleeve; one end of the shifting fork is connected with the transmission sleeve, and the other end of the shifting fork is connected with the movable contact; the transmission sleeve is rotatably sleeved on the push rod, and is also provided with a spiral groove which is matched with the guide pulling nail and used for swinging around the axis of the push rod when the guide pulling nail moves in a reciprocating linear mode, so that the pulling fork and the moving contact are driven to swing along with the transmission sleeve; the utility model discloses a push rod, including push rod, pull nail, locating plate, pull nail, locating plate, push rod's both ends all are equipped with along the perpendicular to push rod axial setting's limiting plate, be equipped with on one of them limiting plate with the limiting plate is the connecting plate that the contained angle set up, pull nail setting is in on the connecting plate.
Further, the isolating contact is further provided with a guide rod between the two limiting plates, and the guide rod is arranged in parallel with and at intervals with the pushing rod and used for guiding the reciprocating movement of the pushing rod.
Further, the above-mentioned isolation contact, the drive mechanism further includes: a movable base; the movable base is arranged in the switch shell, the switch pushing assembly slidably penetrates through the movable base, and the movable base is used for supporting and guiding the reciprocating linear motion of the switch pushing assembly.
Further, the isolation contact is characterized in that a driving groove is formed in the periphery of the driving cam group, and the driving groove is arranged along the variable-diameter outer contour line of the driving cam group.
Further, the above-mentioned isolating contact, the driving cam group includes: two layers of stacked cam plates; the cam disc is arranged on the same shaft, the outer contour lines of the cam discs are arranged on the same shaft, limiting grooves are formed in the reducing outer contour lines of the cam discs, and the limiting grooves are arranged on the same shaft.
Further, the isolating contact is arranged between the two limiting grooves at intervals to form a driving groove with an opening, so that the power input end of the transmission mechanism extends into the limiting grooves from the opening.
On the other hand, the invention also provides a vacuum on-load tap-changer, which is provided with the isolating contact.
According to the isolation contact and the vacuum on-load tap changer with the isolation contact, the power input end of the transmission mechanism is subjected to power input through the driving cam group, so that the driving cam group of the transmission mechanism is driven to convert rotation of the driving cam group into reciprocating swing of the moving contact, the reciprocating swing is enabled to reach contact connection between the first side of the switch shell and a pair of fixed contacts arranged on the first side, communication between the pair of fixed contacts arranged on the first side is achieved, and conduction between two contacts connected with the pair of fixed contacts arranged on the first side is achieved; or swing to the second side of switch shell and a pair of static contact connection that the second side set up, realize the intercommunication between a pair of static contact that the second side set up, and then realize switching over between two contacts that a pair of static contact that the second side set up is connected, realize the switching of vacuum on-load tap-changer, realize on-load tap-changer mechanical time sequence cooperation and electrical switching potential isolation promptly, can be used for cooperating switch contact such as vacuum bubble to carry out electrical switching control and guarantee the accuracy of switching time sequence in the tap-changer. Meanwhile, the isolating contact converts the rotation of the driving cam group into the swing of the moving contact, and the space occupation of the isolating contact relative to other isolating switches moving in the cam plane is small, so that the structure is more compact, and the problem that the space occupation of the existing isolating contact is large is solved.
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 invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
fig. 1 is a schematic structural diagram of an isolation contact according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an isolated contact without a driving cam set according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transmission mechanism according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a switch pushing assembly 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, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Isolation contact embodiment:
referring to fig. 1-2, a preferred construction of an isolation contact provided by an embodiment of the present invention is shown. As shown, the isolation contact includes: a switch shell 1, a driving cam group 2 and a transmission mechanism 3; wherein,,
both the first side (left side as shown in fig. 2) and the second side (right side as shown in fig. 2) of the switch housing 1 are provided with two stationary contacts 4 for connecting different contacts. Specifically, four fixed contacts 4 are disposed on the switch housing 1, where the four fixed contacts are a first fixed contact 401, a second fixed contact 402, a third fixed contact 403 and a fourth fixed contact 404, respectively, the first fixed contact 401 and the second fixed contact 402 are disposed on a first side of the switch housing 1 correspondingly and diagonally, and the third fixed contact 403 and the fourth fixed contact 404 are disposed on a second side of the switch housing 1 correspondingly and diagonally, that is, the four fixed contacts 4 are disposed on the switch housing 1 diagonally. In this embodiment, each fixed contact 4 is partially disposed inside the switch housing 1 so as to connect the moving contact located inside the switch housing 1, and the other part is disposed outside the switch housing 1 so as to connect the contacts, and meanwhile, the moving contact is disposed inside so as to avoid external interference or disturbing switching of the switch; the four fixed contacts 4 may be connected to different contacts, and in particular, two contacts connected to two fixed contacts 4 located on the first side correspond to two contacts connected to two fixed contacts 4 located on the second side. In this embodiment, each of the fixed contacts 4 may take a clip type structure, that is, the end of the fixed contact 4 located in the switch housing 1 is provided with a clip 41 for contacting and connecting the movable contact 5.
The power input end of the transmission mechanism 3 is in transmission connection with the driving cam group 2, and the power output end of the transmission mechanism 3 is provided with a moving contact 5 which is used for converting the rotation of the driving cam group 2 into the reciprocating swing of the moving contact 5 under the driving of the driving cam group 2 so as to swing to the first side, so that the communication between the two fixed contacts 4 at the first side is realized, or swing to the second side, the communication between the two fixed contacts 4 at the second side is realized, and further the switching is realized. Specifically, the power input end of the transmission mechanism 3 is in transmission connection with the driving cam group 2, when the driving cam plate 2 rotates, the transmission mechanism 3 converts the rotation of the driving cam group 2 into the reciprocating swing of the moving contact 5, for example, the reciprocating swing can be clockwise or anticlockwise as shown in fig. 2, so as to swing to the first side of the switch shell 1 to be in contact connection with a pair of fixed contacts 4 arranged on the first side, namely, two ends of the moving contact 5 are respectively in contact connection with clamping pieces 41 of the first fixed contact 401 and the second fixed contact 402, so that the communication between the first fixed contact 401 and the second fixed contact 402 is realized, and the conduction between two contacts connected by the first fixed contact 401 and the second fixed contact 402 is realized; or the second side of the switch shell 1 is swung to be in contact connection with a pair of fixed contacts 4 arranged on the second side, namely, two ends of the moving contact 5 are respectively in contact connection with clamping pieces 41 of a third fixed contact 403 and a fourth fixed contact 404, so that the communication between the third fixed contact 403 and the fourth fixed contact 404 is realized, and further, the conduction between two contacts connected with the third fixed contact 403 and the fourth fixed contact 404 is realized, namely, the conduction between two contacts connected with the first fixed contact 401 and the second fixed contact 402 can be realized, and the switching is carried out to the conduction between two contacts connected with the third fixed contact 403 and the fourth fixed contact 404, namely, the switching of the vacuum on-load tap switch is realized. In this embodiment, the moving contact 5 oscillates in a first plane, which is parallel to the axis of the driving cam group 2.
In this embodiment, the outer periphery of the drive cam group 2 is provided with a drive groove 21, which is arranged along the variable diameter outer contour of the drive cam group 2. Specifically, the outer contour line of the drive cam group 2 has a variable-diameter contour section as a variable-diameter outer contour line, at which a drive groove 21 may be provided so that the distance between one end to the other end of the drive groove 21 and the axis of the drive cam group 4 becomes gradually larger or gradually smaller; wherein, the power input end of the transmission mechanism 3 is matched with the driving groove 21, so as to realize the driving of the power input end of the transmission mechanism 3. In the present embodiment, the driving cam group 2 has at least three sections of variable diameter outer contour lines, and the outer periphery of the driving cam group 2 is provided with three driving grooves 21, which are all arranged along the variable diameter outer contour lines of the driving cam group 2; the switch housing 1, the four fixed contacts 4 and other parts disposed thereon, and the screw transmission mechanism 3 may be combined to form a phase switch switching system, and the driving slots 21 may respectively provide power for the phase switch switching system, that is, in this embodiment, the three driving slots 21 may respectively drive the three-phase switch switching system to switch. Of course, in other embodiments, the driving slots 21 may be other numbers, and the present embodiment is not limited thereto. The driving cam group 2 is arranged outside the switch shell 1, so that the multiphase switch switching system can be driven, and the occupied space of the on-load tap-changer is further reduced.
With continued reference to fig. 1, the switch housing 1 includes: two detachably connected housings. Specifically, the switch housing 1 may be divided into two symmetrical left and right halves, namely a left housing 11 and a right housing 12, which are oppositely arranged and enclosed to form a hollow housing structure; the left housing 11 and the right housing 12 may be detachably connected by a bolt assembly, or may be connected by other manners, which is not limited in this embodiment.
With continued reference to fig. 1, the drive cam set 2 includes: a two-layer stacked cam plate 22; wherein, two layers of cam discs 22 are coaxial to, the outline parallel and level setting of two layers of cam discs 22, the reducing outline department of two layers of cam discs 22 all is equipped with spacing recess 221, and two spacing recesses are opposite to each other 221 and are set up and form drive groove 21. Specifically, the two cam plates 22 may be an upper cam plate 2201 and a lower cam plate 2202, respectively, which may both be cam structures that are symmetrically and coaxially disposed; in this embodiment, the upper cam plate 2201 and the lower cam plate 2202 may be connected by matching between a protrusion and a groove, so that the upper cam plate 2201 and the lower cam plate 2202 may rotate synchronously, and at the same time, the upper cam plate 2201 or the lower cam plate 2202 may be connected with a driving shaft (not shown in the figure) for connecting a driving motor to drive the upper cam plate 2201 and the lower cam plate 2202 to rotate synchronously, and further drive the two limiting grooves 221 provided on the upper cam plate 2201 and the lower cam plate 2202 to rotate synchronously, so as to input power to the power input end of the transmission mechanism 3. Limiting plates 222 are arranged at the variable diameter outer contour lines of the upper cam plate 2201 and the lower cam plate 2202 in an extending mode, limiting grooves 221 are formed in the limiting plates 222 along the outer contour lines of the upper cam plate 2201 and the lower cam plate 2202, the limiting grooves 221 on the upper cam plate 2201 are arranged downwards, the limiting grooves 221 on the lower cam plate 2202 are arranged upwards, gaps are formed between the limiting plates 222 of the upper cam plate 2201 and the limiting plates 222 of the lower cam plate 2202 at intervals, and accordingly driving grooves 21 with openings are formed between the limiting grooves 221 on the upper cam plate 2201 and the limiting grooves 221 of the lower cam plate 2202, the power input ends of the transmission mechanism 3 can extend into the limiting grooves 221 from the gaps between the limiting grooves, namely the openings of the driving grooves 21, the two limiting grooves 221 are matched with the power input ends of the transmission mechanism 3, the transmission mechanism 3 is driven to move, the moving contact 5 is made to swing, and switching of the contact is completed.
With continued reference to fig. 2 and 3, the transmission 3 includes: a switch pushing assembly 31 and a screw driving assembly 32; wherein, the power input end (right end as shown in fig. 1) of the switch pushing assembly 31 is connected with the driving groove 21 for performing reciprocating linear motion under the action of the driving groove 21; the power output end of the screw transmission assembly 32 is in threaded connection with the power input end of the switch pushing assembly 31, and the power output end of the screw transmission assembly 32 is connected with the moving contact 5 and is used for converting the reciprocating linear motion of the switch pushing assembly 31 into reciprocating swing of the moving contact 5; wherein the movable contact 5 performs a reciprocating rectilinear motion in a plane perpendicular to the direction of the reciprocating rectilinear motion of the switch pushing assembly 31.
Specifically, the switch pushing component 31 is slidably arranged on the switch housing 1 in a penetrating manner, the power input end of the switch pushing component 31 is arranged outside the switch housing 1 and is connected with the driving groove 21, when the driving cam group 2 rotates, the driving cam group 2 drives the driving groove 21 to synchronously rotate, so that the driving groove 21 inputs power to the power input end of the switch pushing component 31, and the switch pushing component 31 performs reciprocating linear motion; the screw transmission assembly 32 is disposed inside the switch housing 1, and a power output end of the screw transmission assembly 32 is in threaded connection with a power input end of the switch pushing assembly 31, and a power output end of the screw transmission assembly 32 is connected with the moving contact 5 to convert the reciprocating rectilinear motion of the switch pushing assembly 31 into the reciprocating swing of the moving contact 5, and the moving contact 5 performs the reciprocating rectilinear motion in a plane perpendicular to the reciprocating rectilinear motion direction of the switch pushing assembly 31.
For example, when the driving cam set 2 rotates counterclockwise (relative to the position shown in fig. 1), the driving groove 21 is driven to rotate counterclockwise along with the driving cam set 2, so that the switch pushing assembly 31 moves linearly to the right, the screw transmission assembly 32 can convert the linear movement of the switch pushing 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, that is, the conduction between the two contacts connected by the third fixed contact 403 and the fourth fixed contact is switched 404 to the conduction between the two contacts connected by the first fixed contact 401 and the second fixed contact 402; of course, when the driving cam group 2 rotates clockwise, the movement directions of the switch pushing assembly 31, the screw transmission assembly 32 and the moving contact 5 are opposite to the movement direction when the driving cam group 2 rotates anticlockwise, so that the moving contact swings from the first side of the switch housing 1 to the second side of the switch housing 1, and then is conducted between two contacts connected with the first fixed contact 401 and the second fixed contact 402, and is switched to be conducted between two contacts connected with the third fixed contact 403 and the fourth fixed contact 404.
With continued reference to fig. 2 and 3, the transmission further includes: a movable base 33; wherein, the movable base 33 is installed inside the switch housing 1, and the switch pushing assembly 31 slidably penetrates through the movable base 33, and the movable base 33 is used for supporting and guiding the switch pushing assembly 31. Specifically, the movable base 33 may be fixedly installed inside the switch housing 1 by a bolt assembly, and particularly, may be installed inside the switch housing 1 by a bolt assembly for connection between the left housing 11 and the right housing 12, for the purpose of simplifying the isolating contact structure. The switch pushing assembly 31 penetrates through the switch shell 1 and the movable base 33 in a slidable mode, the spiral transmission assembly 32 is installed on the movable base 33 in a rotatable mode, the switch pushing assembly 31 and the spiral transmission assembly 32 can be movably supported through the movable base 33, further the movable contact 5 is movably supported in swinging, and the movable contact 5 is enabled to swing in a preset circumferential path.
Referring to fig. 4, a schematic structural diagram of a switch pushing assembly according to an embodiment of the present invention is shown. As shown, the switch pushing assembly 31 includes: push rod 311, pull pin 312, and guide pull pin 313; wherein, the nail pulling 312 is arranged on the pushing rod 311, and the nail pulling 312 is matched with the driving groove 21, so that when the driving groove 21 rotates along with the driving cam group 2, the power input is carried out on the nail pulling 312, so that the nail pulling 312 carries out reciprocating rectilinear motion, and the pushing rod 311 is driven to synchronously reciprocate rectilinear motion along with the nail pulling 312; a guide pin 313 is provided on the push rod 311 for connecting the screw drive assembly 32 to apply power to the screw drive assembly 32. Specifically, the push rod 311 is in a straight round rod structure, and slidably penetrates through the switch housing 1 and the movable base 33, and the pull nail 312 is arranged on the push rod 311 and can be used as a power input end of the switch push assembly 31, and is matched with the driving groove 21 to realize power input, so that the push rod 311 performs reciprocating linear motion, and the guide pull nail 313 performs reciprocating linear motion therewith; and the direction of the reciprocating linear motion of the switch pushing component 31 is ensured by the guide of the pushing rod 311; the guide pulling nail 313 may be disposed on the pushing rod 311 along a radial direction of the pushing rod 311, and the guide pulling nail 313 is used as a power output end of the switch pushing assembly 31 and is connected with a power output end of the screw driving assembly 32, so that the screw driving assembly 32 converts the reciprocating linear motion of the guide pulling nail 313 into the swing of the moving contact 5. The guiding pulling pins 313 may be inserted through the pushing rod 311, i.e. two ends are respectively disposed at two sides of the pushing rod 311, so as to be connected to the screw driving assembly 32, thereby ensuring stability of power transmission.
In this embodiment, as shown in fig. 4, two ends of the push rod 311 (left and right ends as shown in fig. 4) are respectively provided with a limiting plate 314 arranged along an axial direction perpendicular to the push rod 311, one limiting plate 314 (left limiting plate 314 as shown in fig. 4) is provided with a connecting plate 315 arranged at an included angle with the limiting plate 314, and the pulling nail 312 is arranged on the connecting plate 315. Specifically, the two limiting plates 314 can limit the two end positions of the push rod 311 which perform the reciprocating linear motion relative to the switch housing 1; the connecting plate 315 may be perpendicular to the limiting plate 314, for supporting the nail pulling 312, so that the nail pulling 312 may be perpendicular to the connecting plate 315 and mounted on the connecting plate 315, and the connecting plate 315 may extend from the opening of the driving slot 21 to enable the nail pulling 312 to be slidably mounted inside the driving slot 21. In this embodiment, there may be two pins 312, namely, an upper pin 31201 and a lower pin 31202, and the two pins 312 are respectively disposed on two sides (upper and lower sides as shown in fig. 4) of the connecting plate 315, so as to be respectively slidably disposed in the two limit grooves 221, so as to improve the stability of the driving cam disc 2 for inputting power to the switch pushing assembly 31; the driving cam group 2 and the poking nails 312 are matched in a geometrically closed mode, and the poking nails 312 are simultaneously constrained in two directions, so that the spring type isolating switch has the characteristic of smaller jumping compared with the current spring type isolating switch in the switching process, arcing of the switch is effectively avoided, the electrical characteristics are reliable, the switching time sequence of the on-load tapping switch is ensured, and the overall technical life of the tapping switch is prolonged.
With continued reference to fig. 4, a guide rod 316 is further disposed between the two limiting plates 314 and is juxtaposed with and spaced from the push rod 311 for guiding the reciprocating movement of the push rod 311. Specifically, two ends of the guide rod 316 are respectively connected to the two limiting plates 315, and the guide rod is slidably disposed through the switch housing 1 and the movable base 33, so that the switch pushing assembly 31 can perform secondary guiding of the reciprocating rectilinear motion, and further stability of the reciprocating rectilinear motion of the switch pushing assembly 31 is ensured.
With continued reference to fig. 3, the screw drive assembly 32 includes: fork 321 and drive sleeve 322; one end (the lower end shown in fig. 3) of the shifting fork 321 is connected with the transmission sleeve 322, and the other end (the upper end shown in fig. 3) of the shifting fork 321 is connected with the movable contact 5; the transmission sleeve 322 is rotatably sleeved on the push rod 311, and the transmission sleeve 322 is further provided with a spiral groove 3221 which is matched with the guide pulling nail 313 and used for swinging the transmission sleeve 322 around the axis of the push rod 311 during the reciprocating linear motion of the guide pulling nail 313, so as to drive the shifting fork 321 and the moving contact 5 to swing along with the transmission sleeve 322, thereby realizing switching. Specifically, the transmission sleeve 322 is provided with a spiral groove 3221, the spiral groove 3221 is a spiral groove structure formed along the circumferential direction of the transmission sleeve 322, the pitch of the spiral groove 3221 is matched with the stroke of the reciprocating linear motion of the guide pull pin 313, the central angle of the spiral groove 3221 is matched with the swinging angle of the moving contact 5, that is, the pitch of the spiral groove 3221 can be determined based on the stroke of the reciprocating linear motion of the guide pull pin 313, and the central angle of the spiral groove 3221 can be determined based on the swinging angle of the moving contact 5; wherein, the spiral groove 3221 is connected with the guiding pulling nail 313, and is combined to form a spiral transmission connection structure, the principle is similar to the transmission connection principle in a ball screw pair, and the reciprocating linear motion of the guiding pulling nail 313 along with the pushing rod 311 is converted into the rotation of the transmission sleeve 322 around the axis of the pushing rod 311; the shifting fork 321 can be arranged along the radial direction of the transmission sleeve 322, and the shifting fork 321 rotates along with the transmission sleeve 322, so that the moving contact 5 is driven to swing around the axis of the push rod 311, and then swing between the first side of the switch shell 1 and the second side of the switch shell 1, and further the switch switching is realized. That is, the preset circumferential path is a circumferential path with the axis of the push rod 311 as a center and the distance between the moving contact 5 and the axis of the push rod 311 as a radius.
It follows that the screw drive assembly 32 is of a cam-controlled fork-type construction which is mounted in a symmetrical switch housing 1 and can be assembled as a modular component in a vacuum on-load tap-changer.
With continued reference to fig. 3, the motion base 33 may include: two base bodies 331 arranged at intervals and in parallel; wherein, two base bodies 331 are inserted in both sides of the screw driving assembly 32, and can limit the screw driving assembly 32, especially the driving sleeve 322, so as to prevent the driving sleeve 322 from moving along the axial direction of the push rod 311, further ensure the stability of the screw driving connection structure between the screw groove 3221 and the guiding pulling nail 313, and ensure the movable contact 5 to swing. To provide long-distance guidance for the reciprocating linear motion of the switch pushing assembly 31, a guide sleeve 332 is preferably further disposed between the two base bodies 331, and the guide rod 316 slidably penetrates the guide sleeve 332.
In summary, in the isolation contact provided in this embodiment, the driving cam group 2 is used to input power to the power input end of the transmission mechanism 3, so that the transmission mechanism 3 converts the rotation of the driving cam group 2 into the reciprocating swing of the moving contact 5 under the driving of the driving cam group 2, so as to swing to the first side of the switch housing 1 to be in contact connection with the pair of fixed contacts 4 arranged on the first side, so as to realize the communication between the pair of fixed contacts 4 arranged on the first side, and further realize the conduction between the two contacts connected with the pair of fixed contacts 4 arranged on the first side; or swing to the second side of switch shell 1 and a pair of fixed contact 4 contact connection of second side setting, realize the intercommunication between a pair of fixed contact 4 of second side setting, and then realize switching over between two contacts that a pair of fixed contact 4 that the second side set up connect, realize the switching of vacuum on-load tap-changer, realize on-load tap-changer mechanical time sequence cooperation and electrical switching potential isolation promptly, can be used to cooperate switch contacts such as vacuum bubble to carry out electrical switching control and guarantee the accuracy of switching time sequence in the tap-changer. Meanwhile, the isolating contact converts the rotation of the driving cam group 2 into the swing of the moving contact in the plane parallel to the axis of the driving cam group 2, and the space occupation of the isolating contact in relation to other isolating switches moving in the cam plane is small, so that the structure is more compact, and the problem that the space occupation of the existing isolating contact is large is solved.
Vacuum on-load tap-changer embodiment:
the embodiment also provides a vacuum on-load tap-changer, and the vacuum on-load tap-changer is provided with the isolation contact. The specific implementation process of the isolation contact is described above, and this embodiment is not described herein.
The isolating contact has the above effects, so the vacuum on-load tap-changer body with the isolating contact also has corresponding technical effects.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (11)
1. An isolated contact, comprising: the switch comprises a switch shell, a driving cam group and a transmission mechanism; wherein,,
the first side and the second side of the switch shell are respectively provided with two fixed contacts for connecting different contacts;
the power input end of the transmission mechanism is in transmission connection with the driving cam group, a moving contact is arranged on the power output end of the transmission mechanism and used for converting the rotation of the driving cam group into reciprocating swing of the moving contact under the driving of the driving cam group, so that the reciprocating swing is connected with the first side of the switch shell in a contact manner with the first side of the switch shell, the communication between the first side of the switch shell and the second side of the switch shell is realized, or the reciprocating swing is connected with the second side of the switch shell in a contact manner with the second side of the switch shell, and the communication between the second side of the switch shell and the switch shell is further realized.
2. The isolated contact of claim 1, wherein the transmission mechanism comprises: the switch pushing assembly and the spiral transmission assembly; wherein,,
the power input end of the switch pushing assembly is connected with the driving cam group and used for performing reciprocating linear motion under the action of the driving cam group;
the power input end of the screw transmission assembly is in threaded connection with the power output end of the switch pushing assembly, and the power output end of the screw transmission assembly is connected with the moving contact and used for converting the reciprocating linear motion of the switch pushing assembly into reciprocating swing of the moving contact.
3. The isolated contact of claim 2, wherein the switch pushing assembly comprises: pushing the rod and pulling out the nails; wherein,,
the nail pulling device comprises a driving cam group, a driving groove, a nail pulling device, a driving rod, a driving cam group, a driving screw, a nail pulling device and a driving screw, wherein the nail pulling device is arranged on the driving rod, and is matched with the driving groove and used for inputting power to the nail pulling device when the driving groove rotates along with the driving cam group, so that the nail pulling device makes reciprocating rectilinear motion, and then drives the driving rod to make synchronous reciprocating rectilinear motion along with the nail pulling.
4. The isolated contact of claim 3, wherein the switch pushing assembly further comprises: guiding and pulling out nails; wherein,,
the guide pulling nails are arranged on the pushing rod and used for being connected with the spiral transmission assembly.
5. The isolated contact of claim 4, wherein the screw drive assembly comprises: shifting fork and driving sleeve; wherein,,
one end of the shifting fork is connected with the transmission sleeve, and the other end of the shifting fork is connected with the movable contact;
the transmission sleeve is rotatably sleeved on the push rod, and is also provided with a spiral groove which is matched with the guide pulling nail and used for swinging around the axis of the push rod when the guide pulling nail moves in a reciprocating linear mode, so that the pulling fork and the moving contact are driven to swing along with the transmission sleeve;
the utility model discloses a push rod, including push rod, pull nail, locating plate, pull nail, locating plate, push rod's both ends all are equipped with along the perpendicular to push rod axial setting's limiting plate, be equipped with on one of them limiting plate with the limiting plate is the connecting plate that the contained angle set up, pull nail setting is in on the connecting plate.
6. The isolated contact of claim 5, wherein the isolated contact is configured to contact the first contact,
and a guide rod is further arranged between the two limiting plates, is juxtaposed with the pushing rods and is arranged at intervals and used for guiding the reciprocating movement of the pushing rods.
7. The isolated contact of claim 2, wherein the transmission mechanism further comprises: a movable base; wherein,,
the movable base is arranged in the switch shell, the switch pushing assembly slidably penetrates through the movable base, and the movable base is used for supporting and guiding the reciprocating linear motion of the switch pushing assembly.
8. Isolation contact according to any of claims 1 to 7, characterized in that,
the periphery of the driving cam group is provided with a driving groove, and the driving groove is arranged along the variable-diameter outer contour line of the driving cam group.
9. The isolated contact of claim 8, wherein the drive cam set comprises: two layers of stacked cam plates; wherein,,
the two layers of cam discs are coaxially arranged, the outer contour lines of the two layers of cam discs are flush, limiting grooves are formed in the reducing outer contour lines of the two layers of cam discs, and the two limiting grooves are oppositely arranged to form a driving groove.
10. The isolated contact of claim 9, wherein the isolated contact is configured to contact the first contact,
the two limit grooves are arranged at intervals to form a driving groove with an opening, so that the power input end of the transmission mechanism extends into the limit grooves from the opening.
11. Vacuum on-load tap changer, characterized in that an isolating contact according to any one of claims 1 to 10 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210766482.6A CN116092847A (en) | 2022-07-01 | 2022-07-01 | Isolation contact and vacuum on-load tap switch with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210766482.6A CN116092847A (en) | 2022-07-01 | 2022-07-01 | Isolation contact and vacuum on-load tap switch with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116092847A true CN116092847A (en) | 2023-05-09 |
Family
ID=86199700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210766482.6A Pending CN116092847A (en) | 2022-07-01 | 2022-07-01 | Isolation contact and vacuum on-load tap switch with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116092847A (en) |
-
2022
- 2022-07-01 CN CN202210766482.6A patent/CN116092847A/en active Pending
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