CN108550496B - 10kV high-voltage electric vacuum protection switch - Google Patents
10kV high-voltage electric vacuum protection switch Download PDFInfo
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- CN108550496B CN108550496B CN201810708117.3A CN201810708117A CN108550496B CN 108550496 B CN108550496 B CN 108550496B CN 201810708117 A CN201810708117 A CN 201810708117A CN 108550496 B CN108550496 B CN 108550496B
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- movable
- unhooking
- fixed
- conductive column
- column
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
- H01H33/6661—Combination with other type of switch, e.g. for load break switches
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
Abstract
The invention discloses a 10kV high-voltage electric vacuum protection switch, belongs to the technical field of power equipment, and solves the problems that a traditional high-voltage vacuum switch has no automatic protection function and cannot realize automatic control. The device mainly comprises a vacuum chamber, a fixed conductive column, a movable conductive column, an output conductive column, a fixed unhooking part, a movable unhooking part, a bimetallic strip, a sliding connecting rod, a screw rod, a micro switch, an electric push-pull rod, a reset baffle and the like. The invention has the automatic protection function and very strong safety; the invention can be opened/closed manually, and can also be controlled by a program to realize the automatic control function of opening/closing, thus laying a good foundation for the future intelligent control of the vacuum switch by the power system; the invention has very strong practicability and obvious social benefit, makes outstanding contribution to the power system industry in China, and has milestone significance in the power system industry in China.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to a 10kV high-voltage electric vacuum protection switch with automatic protection and automatic control functions.
Background
In a power distribution network system, a 10KV high-voltage vacuum switch is continuously improved for decades, and the power distribution network system has the advantages of simple structure, good insulating property, convenience in operation and the like, and is widely applied. Up to now, more than 80% of the market share of China is occupied. However, the conventional high-voltage vacuum switch still has certain defects, and the switch does not have an automatic protection function or an automatic control function. From the development of the future power industry, the requirement of the future social development cannot be obviously met without the automatic control function.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a 10kV high-voltage electric vacuum protection switch with automatic protection and automatic control functions.
The invention is realized by the following technical scheme:
the 10kV high-voltage electric vacuum protection switch comprises a vacuum chamber, wherein a fixed conductive column, a movable conductive column and an output conductive column are arranged in the vacuum chamber, the movable conductive column is positioned right above the fixed conductive column and is electrically connected with the output conductive column through a conductive flexible connection, a fixed unhooking and a movable unhooking which are mutually matched are arranged on the movable conductive column, the fixed unhooking is a conductor, and the movable unhooking is an insulator; the fixed unhooking mechanism is hinged on the movable conductive column, and the fixed unhooking shaft and the metal contact of the movable conductive column are integrated; the movable unhooking is hinged with the movable conductive column through a movable unhooking rotating shaft, a bimetallic strip is clamped between the fixed unhooking and the movable unhooking, and the bimetallic strip is in conductive connection with the conductive soft connection;
the center of the movable unhooking rotating shaft rod is provided with a sliding connecting rod fixedly connected with the movable unhooking rotating shaft rod, the tail end of the sliding connecting rod is fixedly provided with a screw rod with the length longer than the diameter of the movable conductive column, the screw rod is fixedly connected with a movable column connecting screw through a sliding rod tension spring, and the movable column connecting screw is used for fixedly connecting the movable conductive column with a pull rod of an electric push-pull rod;
the movable conductive column is provided with a chute I which can enable the movable unhooking rotating shaft to slide up and down, and the movable conductive column is also provided with a chute II which can enable the screw rod to slide up and down;
one end of the screw rod is electrically connected with the electric push-pull rod through a micro switch, and a reset baffle which is used for limiting the travel of the screw rod and is fixed on the bottom plate is arranged below the other end of the screw rod.
Preferably, the movable conductive column surface is provided with a plane layer, and the fixed unhooking, the movable unhooking and the sliding chute I are all arranged on the plane layer.
Preferably, a fixed unhooking torsion spring is arranged on the fixed unhooking shaft, a movable unhooking torsion spring is arranged on the movable unhooking rotating shaft of the movable unhooking, and the fixed unhooking torsion spring and the movable unhooking torsion spring enable the fixed unhooking and the movable unhooking to be clamped under the stress.
Preferably, a limiting pin I limiting the movable range of the fixed unhooking is arranged on the rotating shaft of the fixed unhooking, and a limiting pin II limiting the movable range of the movable unhooking is arranged on the outer surface of the fixed unhooking.
Preferably, the bottom plate is further fixedly provided with a fixed bearing for preventing the movable conductive column from rotating, the movable conductive column is sleeved on the fixed bearing, two sides of the movable conductive column are provided with sliding grooves, and the fixed bearing can slide up and down in the sliding grooves.
Preferably, the movable conductive column is further provided with a pressure spring locking mechanism, the pressure spring locking mechanism comprises a pressure spring I and a pressure spring II, one end of the pressure spring I is fixedly connected with the movable column connecting screw, the other end of the pressure spring I is fixed on the bottom plate through the locking spring screw I, one end of the pressure spring II is fixedly connected with the movable column connecting screw, and the other end of the pressure spring II is fixed on the bottom plate through the locking spring screw II.
Preferably, the vacuum chamber comprises an outer insulating porcelain sleeve and an insulating cylinder, wherein the outer insulating porcelain sleeve is communicated with the insulating cylinder through an insulating pipe, and a vacuum pump communicated with the outer insulating porcelain sleeve is arranged on the outer insulating porcelain sleeve.
Preferably, a sealing corrugated pipe is arranged at the contact part of the movable conductive column and the insulating porcelain sleeve.
Preferably, the electric push-pull rod is fixed on the bottom plate, and the micro switch is fixed on the movable conductive column.
Compared with the prior art, the invention has the beneficial effects that:
the invention has very ingenious conception, is a high-voltage electric vacuum switch designed based on the thermal deformation characteristic of the bimetallic strip, has the advantages of simple structure, high insulating property, convenient operation and the like of the common switch, also has an automatic protection function and has very strong safety; in addition, the invention can be opened/closed manually, and can also be controlled by a program to realize the automatic control function of opening/closing, thus laying a good foundation for the future intelligent control of the vacuum switch by the power system; the invention has very strong practicability and obvious social benefit, makes outstanding contribution to the power system industry in China, and has milestone significance in the power system industry in China.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of a portion of the present invention;
FIG. 3 is a partial enlarged view of the second embodiment of the present invention;
fig. 4 is a schematic side half-sectional view of the present invention.
In the figure: 1. fixing the conductive column; 2. moving the conductive column; 3. outputting a conductive column; 4. conductive soft connection; 5. fixing and unhooking; 6. moving the unhooking; 7. moving the unhooking rotating shaft; 8. bimetallic strips; 9. a sliding connecting rod; 10. a screw; 11. a sliding rod tension spring; 12. a movable column connecting screw; 13. an electric push-pull rod; 14. a chute I; 15. a chute II; 16. a bottom plate; 17. resetting the baffle; 18. a fixed unhooking torsion spring; 19. moving the unhooking torsion spring; 20. a limiting pin I; 21. a micro-switch; 22. a limiting pin II; 23. fixing a bearing; 24. a pressure spring I; 25. a pressure spring II; 26. locking the spring screw I; 27. locking the spring screw II; 28. an outer insulating porcelain sleeve; 29. an insulating cylinder; 30. a vacuum pump; 31. sealing the bellows.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the 10kV high-voltage electric vacuum protection switch comprises a vacuum chamber, wherein a fixed conductive column 1, a movable conductive column 2 and an output conductive column 3 are arranged in the vacuum chamber, the movable conductive column 2 is positioned right above the fixed conductive column 1 and is electrically connected with the output conductive column 3 through a conductive flexible connection 4, a fixed unhooking hook 5 and a movable unhooking hook 6 which are mutually matched are arranged on the movable conductive column 2, the fixed unhooking hook 5 is a conductor, and the movable unhooking hook 6 is an insulator; the fixed unhooking device 5 is hinged on the movable conductive column 2, and the shaft of the fixed unhooking device 5 is integrated with the metal contact of the movable conductive column 2; the movable unhooking 6 is hinged with the movable conductive column 2 through a movable unhooking rotating shaft 7, a bimetallic strip 8 is clamped between the fixed unhooking 5 and the movable unhooking 6, and the bimetallic strip 8 is in conductive connection with the conductive flexible connection 4;
the center of the shaft lever of the movable unhooking rotating shaft 7 is provided with a sliding connecting rod 9 fixedly connected with the shaft lever, the tail end of the sliding connecting rod 9 is fixedly provided with a screw rod 10 with the length longer than the diameter of the movable conductive column 2, the screw rod 10 is fixedly connected with a movable column connecting screw 12 through a sliding rod tension spring 11, and the movable column connecting screw 12 fixedly connects the movable conductive column 2 with a pull rod of an electric push-pull rod 13;
the movable conductive column 2 is provided with a chute I14 which can enable the movable unhooking rotating shaft 7 to slide up and down, and the movable conductive column 2 is also provided with a chute II 15 which can enable the screw 10 to slide up and down;
one end of the screw rod 10 is electrically connected with the electric push-pull rod 13 through a micro switch 21, and a reset baffle 17 which is used for limiting the travel of the screw rod 10 and is fixed on the bottom plate 16 is arranged below the other end of the screw rod 10.
Preferably, the surface of the movable conductive column 2 is provided with a plane layer, and the fixed unhooking 5, the movable unhooking 6 and the sliding chute I14 are all arranged on the plane layer.
Preferably, a fixed unhooking torsion spring 18 is installed on the shaft of the fixed unhooking 5, a movable unhooking torsion spring 19 is installed on the movable unhooking rotating shaft 7 of the movable unhooking 6, and the fixed unhooking torsion spring 18 and the movable unhooking torsion spring 19 enable the fixed unhooking 5 and the movable unhooking 6 to be clamped under force.
Preferably, a limiting pin I20 limiting the movable range of the fixed unhooking 5 is arranged on the rotating shaft of the fixed unhooking 5, and a limiting pin II 22 limiting the movable range of the movable unhooking 6 is arranged on the outer surface of the fixed unhooking 5.
Preferably, the bottom plate 16 is further fixedly provided with a fixed bearing 23 for preventing the movable conductive column 2 from rotating, the movable conductive column 2 is sleeved on the fixed bearing 23, two sides of the movable conductive column 2 are provided with sliding grooves, and the fixed bearing 23 can slide up and down in the sliding grooves.
Preferably, the movable conductive column 2 is further provided with a pressure spring locking mechanism, the pressure spring locking mechanism comprises a pressure spring I24 and a pressure spring II 25, one end of the pressure spring I24 is fixedly connected with the movable column connecting screw 12, the other end of the pressure spring I is fixed on the bottom plate 16 through a locking spring screw I26, one end of the pressure spring II 25 is fixedly connected with the movable column connecting screw 12, and the other end of the pressure spring II is fixed on the bottom plate 16 through a locking spring screw II 27.
Preferably, the vacuum chamber comprises an outer insulating porcelain sleeve 28 and an insulating cylinder 29, wherein the outer insulating porcelain sleeve 28 is communicated with the insulating cylinder 29 through an insulating tube, and a vacuum pump 30 communicated with the outer insulating porcelain sleeve 28 is arranged on the outer insulating porcelain sleeve 28.
Preferably, a sealing corrugated pipe 31 is arranged at the contact part of the movable conductive post 2 and the insulating porcelain bushing 28.
Preferably, the electric push-pull rod 13 is fixed on the bottom plate 16, and the micro switch 21 is fixed on the movable conductive column 2.
Example 1:
the embodiment comprises a vacuum chamber formed by an outer insulating porcelain sleeve 28 and an insulating cylinder 29, wherein the outer insulating porcelain sleeve 28 is communicated with the insulating cylinder 29 through an insulating tube, a vacuum pump 30 communicated with the outer insulating porcelain sleeve 28 is arranged on the outer insulating porcelain sleeve 28, and the vacuum pump 30 is used for exhausting air from the vacuum chamber to ensure a vacuum insulating environment. The vacuum chamber is internally provided with a fixed conductive column 1, a movable conductive column 2 and an output conductive column 3 which are hermetically connected with the vacuum chamber, wherein the movable conductive column 2 is positioned right above the fixed conductive column 1 and is electrically connected with the output conductive column 3 through a conductive flexible connection 4 to form a high-voltage conductive loop. The surface of the movable conductive column 2 is provided with a plane layer, and the plane layer is from top to bottom and occupies about 2/3 of the height of the movable conductive column. The plane layer is provided with a fixed unhooking part 5 and a movable unhooking part 6 which are matched with each other, the fixed unhooking part 5 is made of a conductive material, and the movable unhooking part 6 is made of an insulating material. The fixed unhooking 5 is hinged on the movable conductive column 2, and the shaft of the fixed unhooking 5 is integrated with the metal contact of the movable conductive column 2. The movable unhooking 6 is hinged with the movable conductive column 2 through a movable unhooking rotating shaft 7, a bimetallic strip 8 is clamped between the fixed unhooking 5 and the movable unhooking 6, the bimetallic strip 8 is in conductive connection with the output conductive column 3 through a conductive flexible connection 4, and the bimetallic strip 8 and the conductive flexible connection 4 are both fixed on the movable conductive column 2; the fixed conductive column 1 is a fixed contact, and the metal contact of the movable conductive column 2 is electrically connected with the output conductive column 3 through the shaft of the fixed unhook 5, the bimetallic strip 8 and the conductive flexible connection 5 to form a high-voltage conductive loop.
The movable unhooking rotating shaft 7 can slide up and down in the sliding groove I14, the sliding connecting rod 9 fixedly connected with the shaft rod is arranged at the central position of the shaft rod of the movable unhooking rotating shaft 7, the screw rod 10 with the length longer than the diameter of the movable conductive column 2 is fixedly arranged at the tail end of the sliding connecting rod 9, namely, two ends of the screw rod 10 extend out of the movable conductive column 2 through the sliding groove II 15 and only move in the range of the sliding groove II 15. The screw rod 10 is fixedly connected with a movable column connecting screw 12 through a sliding rod tension spring 11, and the movable column connecting screw 12 is fixedly connected with a pull rod of an electric push-pull rod 13 through the movable conductive column 2.
And one end of the screw rod 10 is electrically connected with the electric push-pull rod 13 through the micro switch 21, a reset baffle 17 is arranged at the lower position of the other end of the screw rod 10, the reset baffle 17 is used for limiting the travel of the screw rod 10, and when the micro switch 21 is turned on, the screw rod 10 is pushed back under the blocking of the reset baffle 17.
The working process of the embodiment is as follows: when the power load exceeds the rated current of the switch, the bimetallic strip 8 generates heat to generate bending deformation, the movable unhooking 6 is lifted upwards, and the movable unhooking 6 is instantaneously separated from the fixed unhooking 5 under the acting force of the sliding rod tension spring 11. The concrete action is that the sliding pull rod spring 11 pulls the screw rod 10, the screw rod 10 moves downwards along the chute II 15, the downwards movement of the screw rod 10 drives the sliding connecting rod 9 and the movable unhooking rotating shaft 7 to move downwards, and the movable unhooking 6 is driven to be instantaneously separated from the fixed unhooking 5. When the screw rod 10 moves downwards, the reed of the micro switch 21 is pushed, the micro switch 21 is closed instantaneously, so that the electric push-pull rod 13 is powered on, the electric push-pull rod 13 is powered on to start the pull rod to move downwards, the pull rod moves downwards to pull the movable conductive column 2 fixedly connected with the pull rod, and the movable conductive column 2 moves downwards and is separated from the contact of the fixed conductive column 1 by a safe distance.
Meanwhile, when the other end of the screw rod 10 moving downwards reaches the position of the reset baffle 17, the screw rod 10 collides with the reset baffle 17, the screw rod 10 is pushed back instantly, the bimetallic strip 8 is restored to the original position, and the screw rod 10 pushes the sliding connecting rod 9 to drive the movable unhooking 6, so that the movable unhooking 6 and the fixed unhooking 5 are combined to finish reset.
The switching-on of the embodiment can be performed through manual switching-on or program control. When the electric push-pull rod 13 is required to be switched on, the electric push-pull rod 13 is electrified to give a pulse signal, the pull rod of the electric push-pull rod 13 pushes the sliding connecting rod 9 through the movable column connecting screw 12, the movable conductive column 2 moves upwards, and the movable conductive column 2 is contacted with the two contacts of the fixed conductive column 1, so that the switching-on is completed.
The embodiment has very ingenious conception, is a high-voltage electric vacuum switch designed based on the thermal deformation characteristic of the bimetallic strip, has the advantages of simple structure, high insulating property, convenient operation and the like of a common switch, also has an automatic protection function and has very strong safety; in addition, the embodiment can be opened/closed manually, and the program control can be performed on the embodiment to realize the automatic control function of opening/closing, so that a good foundation is laid for the future intelligent control of the power system on the vacuum switch, and the method has strong practicability.
Example 2:
the embodiment comprises a vacuum chamber formed by an outer insulating porcelain sleeve 28 and an insulating cylinder 29, wherein the outer insulating porcelain sleeve 28 is communicated with the insulating cylinder 29 through an insulating tube, a vacuum pump 30 communicated with the outer insulating porcelain sleeve 28 is arranged on the outer insulating porcelain sleeve 28, and the vacuum pump 30 is used for exhausting air from the vacuum chamber to ensure a vacuum insulating environment. The vacuum chamber is internally provided with a fixed conductive column 1, a movable conductive column 2 and an output conductive column 3 which are hermetically connected with the vacuum chamber, wherein the movable conductive column 2 is positioned right above the fixed conductive column 1 and is electrically connected with the output conductive column 3 through a conductive flexible connection 4 to form a high-voltage conductive loop. The surface of the movable conductive column 2 is provided with a plane layer, and the plane layer is from top to bottom and occupies about 2/3 of the height of the movable conductive column. The plane layer is provided with a fixed unhooking part 5 and a movable unhooking part 6 which are matched with each other, the fixed unhooking part 5 is made of a conductive material, and the movable unhooking part 6 is made of an insulating material. The fixed unhooking 5 is hinged on the movable conductive column 2, and the shaft of the fixed unhooking 5 is integrated with the metal contact of the movable conductive column 2. The movable unhooking 6 is hinged with the movable conductive column 2 through a movable unhooking rotating shaft 7, a bimetallic strip 8 is clamped between the fixed unhooking 5 and the movable unhooking 6, the bimetallic strip 8 is in conductive connection with the output conductive column 3 through a conductive flexible connection 4, and the bimetallic strip 8 and the conductive flexible connection 4 are both fixed on the movable conductive column 2; the fixed conductive column 1 is a fixed contact, and the metal contact of the movable conductive column 2 is electrically connected with the output conductive column 3 through the shaft of the fixed unhook 5, the bimetallic strip 8 and the conductive flexible connection 5 to form a high-voltage conductive loop.
The movable unhooking rotating shaft 7 can slide up and down in the sliding groove I14, the sliding connecting rod 9 fixedly connected with the shaft rod is arranged at the central position of the shaft rod of the movable unhooking rotating shaft 7, the screw rod 10 with the length longer than the diameter of the movable conductive column 2 is fixedly arranged at the tail end of the sliding connecting rod 9, namely, two ends of the screw rod 10 extend out of the movable conductive column 2 through the sliding groove II 15 and only move in the range of the sliding groove II 15. The screw rod 10 is fixedly connected with a movable column connecting screw 12 through a sliding rod tension spring 11, and the movable column connecting screw 12 is fixedly connected with a pull rod of an electric push-pull rod 13 through the movable conductive column 2.
And one end of the screw rod 10 is electrically connected with the electric push-pull rod 13 through the micro switch 21, a reset baffle 17 is arranged at the lower position of the other end of the screw rod 10, the reset baffle 17 is used for limiting the travel of the screw rod 10, and when the micro switch 21 is turned on, the screw rod 10 is pushed back under the blocking of the reset baffle 17.
In this embodiment, a fixed unhooking torsion spring 18 is further installed on the shaft of the fixed unhooking 5, a movable unhooking torsion spring 19 is installed on the movable unhooking rotating shaft 7 of the movable unhooking 6, and the fixed unhooking 5 and the movable unhooking 6 are forced and clamped by the fixed unhooking torsion spring 18 and the movable unhooking torsion spring 19. In addition, the movable unhooking torsion spring 19 can make the reset position more accurate when the movable unhooking 6 is reset.
The working process of the embodiment is as follows: when the power load exceeds the rated current of the switch, the bimetallic strip 8 generates heat to generate bending deformation, the movable unhooking 6 is lifted upwards, and the movable unhooking 6 is instantaneously separated from the fixed unhooking 5 under the acting force of the sliding rod tension spring 11. The concrete action is that the sliding pull rod spring 11 pulls the screw rod 10, the screw rod 10 moves downwards along the chute II 15, the downwards movement of the screw rod 10 drives the sliding connecting rod 9 and the movable unhooking rotating shaft 7 to move downwards, and the movable unhooking 6 is driven to be instantaneously separated from the fixed unhooking 5. When the screw rod 10 moves downwards, the reed of the micro switch 21 is pushed, the micro switch 21 is closed instantaneously, so that the electric push-pull rod 13 is powered on, the electric push-pull rod 13 is powered on to start the pull rod to move downwards, the pull rod moves downwards to pull the movable conductive column 2 fixedly connected with the pull rod, and the movable conductive column 2 moves downwards and is separated from the contact of the fixed conductive column 1 by a safe distance.
Meanwhile, when the other end of the screw rod 10 moving downwards reaches the position of the reset baffle 17, the screw rod 10 collides with the reset baffle 17, the screw rod 10 is pushed back instantly, the bimetallic strip 8 is restored to the original position, the screw rod 10 pushes the sliding connecting rod 9 to drive the movable unhooking 6, the movable unhooking 6 and the fixed unhooking 5 are combined to complete reset, under the action of the fixed unhooking torsion spring 18 and the movable unhooking torsion spring 19, the two unhooking stress is tighter and more stable, and the acting force of the movable unhooking torsion spring 19 in the reset process can move the unhooking 6 to reset faster and more accurately.
The switching-on of the embodiment can be performed through manual switching-on or program control. When the electric push-pull rod 13 is required to be switched on, the electric push-pull rod 13 is electrified to give a pulse signal, the pull rod of the electric push-pull rod 13 pushes the sliding connecting rod 9 through the movable column connecting screw 12, the movable conductive column 2 moves upwards, and the movable conductive column 2 is contacted with the two contacts of the fixed conductive column 1, so that the switching-on is completed.
The embodiment has very ingenious conception, is a high-voltage electric vacuum switch designed based on the thermal deformation characteristic of the bimetallic strip, has the advantages of simple structure, high insulating property, convenient operation and the like of a common switch, also has an automatic protection function and has very strong safety; in addition, the embodiment can be opened/closed manually, and the program control can be performed on the embodiment to realize the automatic control function of opening/closing, so that a good foundation is laid for the future intelligent control of the power system on the vacuum switch, and the method has strong practicability.
Example 3:
the embodiment comprises a vacuum chamber formed by an outer insulating porcelain sleeve 28 and an insulating cylinder 29, wherein the outer insulating porcelain sleeve 28 is communicated with the insulating cylinder 29 through an insulating tube, a vacuum pump 30 communicated with the outer insulating porcelain sleeve 28 is arranged on the outer insulating porcelain sleeve 28, and the vacuum pump 30 is used for exhausting air from the vacuum chamber to ensure a vacuum insulating environment. The vacuum chamber is internally provided with a fixed conductive column 1, a movable conductive column 2 and an output conductive column 3 which are hermetically connected with the vacuum chamber, wherein the movable conductive column 2 is positioned right above the fixed conductive column 1 and is electrically connected with the output conductive column 3 through a conductive flexible connection 4 to form a high-voltage conductive loop. The surface of the movable conductive column 2 is provided with a plane layer, and the plane layer is from top to bottom and occupies about 2/3 of the height of the movable conductive column. The plane layer is provided with a fixed unhooking part 5 and a movable unhooking part 6 which are matched with each other, the fixed unhooking part 5 is made of a conductive material, and the movable unhooking part 6 is made of an insulating material. The fixed unhooking 5 is hinged on the movable conductive column 2, and the shaft of the fixed unhooking 5 is integrated with the metal contact of the movable conductive column 2. The movable unhooking 6 is hinged with the movable conductive column 2 through a movable unhooking rotating shaft 7, a bimetallic strip 8 is clamped between the fixed unhooking 5 and the movable unhooking 6, the bimetallic strip 8 is in conductive connection with the output conductive column 3 through a conductive flexible connection 4, and the bimetallic strip 8 and the conductive flexible connection 4 are both fixed on the movable conductive column 2; the fixed conductive column 1 is a fixed contact, and the metal contact of the movable conductive column 2 is electrically connected with the output conductive column 3 through the shaft of the fixed unhook 5, the bimetallic strip 8 and the conductive flexible connection 5 to form a high-voltage conductive loop.
The movable unhooking rotating shaft 7 can slide up and down in the sliding groove I14, the sliding connecting rod 9 fixedly connected with the shaft rod is arranged at the central position of the shaft rod of the movable unhooking rotating shaft 7, the screw rod 10 with the length longer than the diameter of the movable conductive column 2 is fixedly arranged at the tail end of the sliding connecting rod 9, namely, two ends of the screw rod 10 extend out of the movable conductive column 2 through the sliding groove II 15 and only move in the range of the sliding groove II 15. The screw rod 10 is fixedly connected with a movable column connecting screw 12 through a sliding rod tension spring 11, and the movable column connecting screw 12 is fixedly connected with a pull rod of an electric push-pull rod 13 through the movable conductive column 2.
And one end of the screw rod 10 is electrically connected with the electric push-pull rod 13 through the micro switch 21, a reset baffle 17 is arranged at the lower position of the other end of the screw rod 10, the reset baffle 17 is used for limiting the travel of the screw rod 10, and when the micro switch 21 is turned on, the screw rod 10 is pushed back under the blocking of the reset baffle 17.
In this embodiment, a fixed unhooking torsion spring 18 is installed on the shaft of the fixed unhooking 5, a movable unhooking torsion spring 19 is installed on the movable unhooking rotating shaft 7 of the movable unhooking 6, and the fixed unhooking 5 and the movable unhooking 6 are forced and clamped by the fixed unhooking torsion spring 18 and the movable unhooking torsion spring 19. In addition, the movable unhooking torsion spring 19 can make the reset position more accurate when the movable unhooking 6 is reset.
In this embodiment, a limiting pin i 20 for limiting the moving range of the fixed unhooking 5 is further disposed on the rotating shaft of the fixed unhooking 5, and a limiting pin ii 22 for limiting the moving range of the movable unhooking 6 is disposed on the outer surface of the fixed unhooking 5. The design of the locating pin can enable the two unhooks to be more stable and accurate when the disengaging and combining actions are switched.
The bottom plate 16 of the embodiment is also fixedly provided with a fixed bearing 23, the movable conductive column 2 is sleeved on the fixed bearing 23, two sides of the movable conductive column 2 are provided with sliding grooves, and the fixed bearing 23 can slide up and down in the sliding grooves. The fixed bearing 23 is designed mainly to prevent the movable conductive column 2 from rotating, so that the movable conductive column 2 is more stable in motion.
In this embodiment, the movable conductive column 2 is further provided with a pressure spring locking mechanism, the pressure spring locking mechanism includes a pressure spring i 24 and a pressure spring ii 25, one end of the pressure spring i 24 is fixedly connected with the movable column connecting screw 12, the other end is fixed on the bottom plate 16 through a locking spring screw i 26, one end of the pressure spring ii 25 is fixedly connected with the movable column connecting screw 12, and the other end is fixed on the bottom plate 16 through a locking spring screw ii 27. The pressure spring I24 and the pressure spring II 25 change in position along with the movement of the movable conductive column 2, and when the movable conductive column 2 is in a closing state, the pressure spring I24 and the pressure spring II 25 integrally generate acting force upwards, so that the movable conductive column 2 is in tighter contact with the fixed conductive column 1, and the closing state is locked. When the movable conductive column 2 is in a closing state, the pressure spring I24 and the pressure spring II 25 integrally generate acting force downwards, so that the movable conductive column 2 and the fixed conductive column 1 are pulled out more tightly, and a locking effect is achieved on the opening state.
The working process of the embodiment is as follows: when the power load exceeds the rated current of the switch, the bimetallic strip 8 generates heat to generate bending deformation, the movable unhooking 6 is lifted upwards, and the movable unhooking 6 is instantaneously separated from the fixed unhooking 5 under the acting force of the sliding rod tension spring 11. The concrete action is that the sliding pull rod spring 11 pulls the screw rod 10, the screw rod 10 moves downwards along the chute II 15, the downwards movement of the screw rod 10 drives the sliding connecting rod 9 and the movable unhooking rotating shaft 7 to move downwards, and the movable unhooking 6 is driven to be instantaneously separated from the fixed unhooking 5. When the screw rod 10 moves downwards, the reed of the micro switch 21 is pushed, the micro switch 21 is closed instantly, so that the electric push-pull rod 13 is powered on, the electric push-pull rod 13 is powered on to start the pull rod to move downwards, the pull rod moves downwards to pull the movable conductive column 2 fixedly connected with the pull rod, the movable conductive column 2 moves downwards, a safe distance is separated from a contact of the fixed conductive column 1, and the opening of a brake is completed, so that an automatic protection function is realized.
Meanwhile, when the other end of the screw rod 10 moving downwards reaches the position of the reset baffle 17, the screw rod 10 collides with the reset baffle 17, the screw rod 10 is pushed back instantly, the bimetallic strip 8 is restored to the original position, the screw rod 10 pushes the sliding connecting rod 9 to drive the movable unhooking 6, the movable unhooking 6 and the fixed unhooking 5 are combined to complete reset, under the action of the fixed unhooking torsion spring 18 and the movable unhooking torsion spring 19, the two unhooking stress is tighter and more stable, and the acting force of the movable unhooking torsion spring 19 in the reset process can move the unhooking 6 to reset faster and more accurately.
The switching-on of the embodiment can be performed through manual switching-on or program control. When the electric push-pull rod 13 is required to be switched on, the electric push-pull rod 13 is electrified to give a pulse signal, the pull rod of the electric push-pull rod 13 pushes the sliding connecting rod 9 through the movable column connecting screw 12, the movable conductive column 2 moves upwards, and the movable conductive column 2 is contacted with the two contacts of the fixed conductive column 1, so that the switching-on is completed.
The invention has very ingenious conception, is a high-voltage electric vacuum switch designed based on the thermal deformation characteristic of the bimetallic strip, has the advantages of simple structure, high insulating property, convenient operation and the like of the common switch, also has an automatic protection function and has very strong safety; in addition, the invention can be opened/closed manually, can also be used for realizing the automatic control function of opening/closing by program control, lays a good foundation for realizing intelligent control of a vacuum switch for a future power system, and has strong practicability.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, but rather the equivalent variations and modifications in shape, construction, characteristics and spirit according to the scope of the claims should be construed to be included in the scope of the claims.
Claims (5)
1. The utility model provides a 10kV high voltage electric vacuum protection switch, includes the vacuum chamber, be equipped with fixed conductive column in the vacuum chamber, remove conductive column and output conductive column, remove conductive column and be located directly over the fixed conductive column, and through electrically conductive soft connection with output conductive column electricity is connected, its characterized in that: the movable conductive column is provided with a fixed unhooking and a movable unhooking which are matched with each other, the fixed unhooking is a conductor, and the movable unhooking is an insulator; the fixed unhooking mechanism is hinged on the movable conductive column, and the fixed unhooking shaft and the metal contact of the movable conductive column are integrated; the movable unhooking is hinged with the movable conductive column through a movable unhooking rotating shaft, a bimetallic strip is clamped between the fixed unhooking and the movable unhooking, and the bimetallic strip is in conductive connection with the conductive soft connection;
the center of the shaft lever of the movable unhooking rotating shaft is provided with a sliding connecting rod fixedly connected with the shaft lever, the tail end of the sliding connecting rod is fixedly provided with a screw rod with the length longer than the diameter of the movable conductive column, the screw rod is fixedly connected with a movable column connecting screw through a sliding rod tension spring, and the movable column connecting screw is used for fixedly connecting the movable conductive column with a pull rod of an electric push-pull rod;
the movable conductive column is provided with a chute I which can enable the movable unhooking rotating shaft to slide up and down, and the movable conductive column is also provided with a chute II which can enable the screw rod to slide up and down;
one end of the screw rod is electrically connected with the electric push-pull rod through a micro switch, a reset baffle which is used for limiting the travel of the screw rod and is fixed on a bottom plate is arranged below the other end of the screw rod, a fixed bearing which is used for preventing the movable conductive column from rotating is also fixedly arranged on the bottom plate, the movable conductive column is sleeved on the fixed bearing, sliding grooves are formed in two sides of the movable conductive column, and the fixed bearing can slide up and down in the sliding grooves;
the movable conductive column surface body is provided with a plane layer, and the fixed unhooking, the movable unhooking and the sliding chute I are all arranged on the plane layer;
the movable conductive column is also provided with a pressure spring locking mechanism, the pressure spring locking mechanism comprises a pressure spring I and a pressure spring II, one end of the pressure spring I is fixedly connected with the movable column connecting screw, the other end of the pressure spring I is fixed on the bottom plate through a locking spring screw I, one end of the pressure spring II is fixedly connected with the movable column connecting screw, and the other end of the pressure spring II is fixed on the bottom plate through a locking spring screw II; the electric push-pull rod is fixed on the bottom plate, and the micro switch is fixed on the movable conductive column.
2. The 10kV high-voltage electric vacuum protection switch according to claim 1, wherein: the fixed unhooking shaft is provided with a fixed unhooking torsion spring, the movable unhooking rotating shaft is provided with a movable unhooking torsion spring, and the fixed unhooking torsion spring and the movable unhooking torsion spring enable the fixed unhooking and the movable unhooking to be clamped under the stress.
3. The 10kV high-voltage electric vacuum protection switch according to claim 2, wherein: the rotating shaft of the fixed unhooking is provided with a limiting pin I limiting the movable range of the fixed unhooking, and the outer surface of the fixed unhooking is provided with a limiting pin II limiting the movable range of the movable unhooking.
4. The 10kV high-voltage electric vacuum protection switch according to claim 1, wherein: the vacuum chamber comprises an outer insulating porcelain sleeve and an insulating cylinder, wherein the outer insulating porcelain sleeve is communicated with the insulating cylinder through an insulating pipe, and a vacuum pump communicated with the outer insulating porcelain sleeve is arranged on the outer insulating porcelain sleeve.
5. The 10kV high-voltage electric vacuum protection switch of claim 4, wherein: and a sealing corrugated pipe is arranged at the contact part of the movable conductive column and the outer insulating ceramic sleeve.
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| CN201810708117.3A CN108550496B (en) | 2018-07-02 | 2018-07-02 | 10kV high-voltage electric vacuum protection switch |
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| CN201810708117.3A CN108550496B (en) | 2018-07-02 | 2018-07-02 | 10kV high-voltage electric vacuum protection switch |
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| CN108550496B true CN108550496B (en) | 2023-08-01 |
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| CN108550496A (en) | 2018-09-18 |
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