Electric operating mechanism and high voltage switch

Abstract

The present application relates to the technical field of high-voltage switch, in particular to an electric operating mechanism and high-voltage switch. The mechanism comprises a mechanism panel, opening and closing indication switches and their opening and closing linkage crank arms installed on the shafts of the switches, linkage crank arms are connected by connecting rods to form a parallelogram mechanism, a screw rod is installed in parallel on the inner side of the mechanism panel, a nut with a lever is installed on the screw rod, an output shaft with a radially extending fork is rotatably assembled on the mechanism panel on the radial side of the screw rod, the lever drives the fork to move back and forth with the nut, the fork has opening and closing positions corresponding to the opening and closing positions of the high-voltage switch, the nut is provided with an overtravel corresponding to the opening and closing positions of the fork on the screw rod, and the overtravel corresponds to the closing stroke of the opening and closing indication switches; the lever is connected with the connecting rod through a swing connecting plate on the mechanism panel, and the fork just closes the opening and closing indication switch when it is in the closing position, and vice versa. The present application can ensure that the indication of the opening and closing of the high-voltage switch is output when the opening and closing is completed, and it is safe and reliable.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, specifically to an electric operating mechanism and a high-voltage switch. Background Technology

[0002] In high-voltage switchgear, auxiliary switches are an important component and are often installed in main switchgear such as circuit breakers and disconnectors. They are used for opening and closing of secondary control circuits, as well as for signal output to reflect the opening and closing status of the switchgear and for interlocking protection.

[0003] Patent document CN104282454B, with authorization announcement date of 2016 / 05 / 25, discloses a transmission mechanism for an electrically driven disconnector with stepless adjustable stroke. This mechanism includes a drive motor, which is connected to an output shaft via a reduction gear. The output end of the output shaft is connected to the moving contact of the disconnector to drive it to open and close. A nut is also installed on the output shaft, forming a screw-nut mechanism. When the output shaft rotates forward and backward, the nut reciprocates on the output shaft. The mechanism includes a lever mounted on a nut, which moves with the nut to control two auxiliary switches. One of the auxiliary switches is a closing indicator switch that sends a closing signal corresponding to the closed position of the isolating switch, and the other is an opening indicator switch that sends an opening signal corresponding to the open position of the isolating switch. The closing and opening indicator switches are arranged side by side. A closing linkage crank arm is mounted on the closing indicator switch, and a opening linkage crank arm is mounted on the opening indicator switch. The closing and opening linkage crank arms are connected by a linkage to form a quadrilateral mechanism. The lever on the nut is driven by the linkage. When the moving contact of the isolating switch moves to the open position, the opening indicator switch is on, and the closing indicator switch is off; when the moving contact of the isolating switch moves to the closed position, the closing indicator switch is on, and the opening indicator switch is off; when the moving contact of the isolating switch is between the open and closed positions, both the opening and closing indicator switches are off.

[0004] The aforementioned patented mechanism uses open / close indicator switches to indicate the operating status of the disconnector switch, representing a typical disconnector switch operating mechanism. While it doesn't detail the synchronization between the open / close indicator switches and the disconnector switch's position, current market products show that existing disconnector switch operating mechanisms don't adequately consider the synchronization between the open / close indicator switches and the disconnector switch's opening and closing. Specifically, to ensure sufficient insulation distance, a certain gap is required between the moving and stationary contacts of the disconnector switch; to ensure sufficient current-carrying reliability, a certain engagement stroke is required between the moving and stationary contacts. However, since the open / close indicator switches themselves also have a certain closing stroke, in existing disconnector switch operating mechanisms, the open indicator switch starts closing before the disconnector switch is fully open, and the close indicator switch starts closing before the disconnector switch is fully closed, resulting in inaccurate indications. Summary of the Invention

[0005] The purpose of this invention is to provide an electric operating mechanism and a high-voltage switch to solve the problem in the existing structure where the auxiliary switch is turned on before the high-voltage switch is fully closed, resulting in inaccurate indications.

[0006] To achieve the above objectives, the electric operating mechanism of the present invention adopts the following technical solution: An electric operating mechanism includes a mechanism panel, a tripping indicator switch, and a closing indicator switch. Tripping and closing linkage crank arms are correspondingly mounted on the switch shafts of the tripping and closing indicator switches. These crank arms are synchronously connected via a linkage to form a parallelogram mechanism. A lead screw is mounted parallel to the inside of the mechanism panel, and a nut is mounted on the lead screw. A lever is mounted on the nut. An output shaft for driving the high-voltage switch to trip or close is rotatably mounted on the radial side of the lead screw on the mechanism panel. A radially extending lever is mounted on the output shaft. The lever moves back and forth with the nut, which drives the shift fork. The shift fork has an open position corresponding to the open position of the high-voltage switch and a closed position corresponding to the closed position of the high-voltage switch. The nut on the lead screw has an overtravel corresponding to the open and closed positions of the shift fork. This overtravel corresponds to the closing stroke of the open indicator switch and the closed indicator switch. The lever is connected to the connecting rod through a swing plate mounted on the mechanism panel. When the shift fork is in the closed position, the closed indicator switch is just closed. When the shift fork is in the open position, the open indicator switch is just open.

[0007] Furthermore, the swing plate is provided with a lever engagement groove, which includes a U-shaped middle section and opening and closing corresponding sections at both ends of the middle section. When the high-voltage switch is in the middle position, the middle section is parallel to the lead screw. When the high-voltage switch is in the opening position, the lever reaches the opening corresponding section and cooperates with it to drive the opening indicator switch to close. When the high-voltage switch is in the closing position, the lever reaches the closing corresponding section and cooperates with it to drive the closing indicator switch to close.

[0008] Furthermore, the side of the swing plate away from the open / close indicator switch has a protruding handle, which is swung and mounted on the mechanism panel.

[0009] Furthermore, the side of the swing plate near the open / close indicator switch has an output arm protruding, and the output arm has an elongated hole, which is connected to the connecting rod.

[0010] Furthermore, the output arm is connected to one of the open / close indicator switches and the connecting rod via the same pin.

[0011] Beneficial effects: The electric operating mechanism of the present invention is a pioneering invention. The electric operating mechanism of this invention designs the opening and closing stroke of the original auxiliary switch as an overtravel structure to allow for delayed operation during the closing process. This avoids issuing an indication immediately upon closing. The mechanism uses a motor to provide driving force, improving its ease of use. It drives the lead screw to rotate forward or backward. Utilizing the lead screw's high load-bearing capacity and simple structure, a nut is installed. Through threaded transmission, the nut reciprocates along the lead screw, simultaneously driving a lever on the nut to move a fork on the output shaft. This causes the output shaft to rotate, completing the opening and closing of the switch. The nut's stroke on the lead screw includes overtravel at both the open and closed positions, corresponding to the open and closed indicator switches in the auxiliary switch, respectively. When the fork is in the closed position, the closed indicator switch is just closed; when the fork is in the open position, the open indicator switch is just open. This overtravel section allows sufficient time for the high-voltage switch's opening and closing operation. When the stroke is fully completed, the high-voltage switch is also in position, ensuring operator safety and improving equipment safety and reliability.

[0012] To achieve the above objectives, the high-voltage switch of the present invention adopts the following technical solution: A high-voltage switch includes an electrically operated mechanism. The electrically operated mechanism includes a mechanism panel and an opening indicator switch and a closing indicator switch for indicating the opening and closing of the high-voltage switch. The mechanism is characterized in that opening and closing linkage crank arms are correspondingly mounted on the switch shafts of the opening and closing indicator switches. The opening and closing linkage crank arms are synchronously connected by a connecting rod to form a parallelogram mechanism. A lead screw is mounted parallel to the inside of the mechanism panel, and a nut is mounted on the lead screw. A lever is provided on the nut. An output shaft for driving the opening and closing of the high-voltage switch is rotatably mounted on one radial side of the lead screw on the mechanism panel. A radially extending shift fork is provided on the output shaft. The shift lever moves back and forth with the nut to drive the shift fork. The shift fork has an open position corresponding to the open position of the high-voltage switch and a closed position corresponding to the closed position of the high-voltage switch. The nut on the lead screw has an overtravel corresponding to the open and closed positions of the shift fork. This overtravel corresponds to the closing stroke of the open indicator switch and the closed indicator switch. The shift lever is connected to the connecting rod through a swing connecting plate installed on the mechanism panel. When the shift fork is in the closed position, the closed indicator switch is just closed. When the shift fork is in the open position, the open indicator switch is just open.

[0013] Furthermore, the swing plate is provided with a lever engagement groove, which includes a U-shaped middle section and opening and closing corresponding sections at both ends of the middle section. When the high-voltage switch is in the middle position, the middle section is parallel to the lead screw. When the high-voltage switch is in the opening position, the lever reaches the opening corresponding section and cooperates with it to drive the opening indicator switch to close. When the high-voltage switch is in the closing position, the lever reaches the closing corresponding section and cooperates with it to drive the closing indicator switch to close.

[0014] Furthermore, the side of the swing plate away from the open / close indicator switch has a protruding handle, which is swung and mounted on the mechanism panel.

[0015] Furthermore, the side of the swing plate near the open / close indicator switch has an output arm protruding, and the output arm has an elongated hole, which is connected to the connecting rod.

[0016] Furthermore, the output arm is connected to one of the open / close indicator switches and the connecting rod via the same pin.

[0017] Beneficial effects: The high-voltage switch of this invention is a pioneering invention. The electric operating mechanism in the high-voltage switch of this invention designs the opening and closing stroke of the original auxiliary switch to an overtravel structure that allows for delayed operation during the closing process. This avoids issuing an indication immediately upon closing. The mechanism is driven by a motor, improving its ease of use. It drives the lead screw to rotate forward or backward. Utilizing the lead screw's high load-bearing capacity and simple structure, a nut is installed. Through threaded transmission, the nut reciprocates along the lead screw, simultaneously driving a lever on the nut to actuate a fork on the output shaft. This causes the output shaft to rotate, completing the switch's opening and closing. The nut's stroke on the lead screw includes overtravel at both the open and closed positions, corresponding to the open and closed indicator switches in the auxiliary switch, respectively. When the fork is in the closed position, the closed indicator switch is just closed; when the fork is in the open position, the open indicator switch is just open. This overtravel allows sufficient time for the high-voltage switch's opening and closing operation. When the stroke is fully completed, the high-voltage switch is also in position, ensuring operator safety and improving equipment safety and reliability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal workings of the operating mechanism of the present invention; Figure 2 A schematic diagram showing the tripped position of the operating mechanism; Figure 3 This is a schematic diagram of the operating mechanism in its intermediate position. Figure 4 This is a schematic diagram of the closed position of the operating mechanism.

[0019] In the diagram: 1. Mechanism panel; 2. Closing indicator switch; 3. Opening indicator switch; 4. Linkage crank arm; 5. Connecting rod; 6. Swinging connecting plate; 7. Lead screw; 8. Nut; 9. Output shaft; 10. Shift fork; 11. Shift lever; 12. Shift lever mating groove; 13. Intermediate section; 14. Opening corresponding section; 15. Closing corresponding section; 16. Plate handle; 17. Output arm; 18. Long hole; 19. Pin shaft; 20. Motor. Detailed Implementation

[0020] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0021] The electric operating mechanism of this invention enables the open / close indicator switch to output an indication when the main switch is in the open / closed position. The electric operating mechanism of this invention utilizes a swing connecting plate to simultaneously drive the opening / closing of the main switch and the opening / closing of the open / close indicator switch. An overtravel section is designed for the opening / closing of the open / close indicator switch to ensure the main switch is fully in the open / closed position, thus improving the safety and reliability of the mechanism.

[0022] As a basic solution, such as Figure 1-4 As shown, the electric operating mechanism of the present invention includes a mechanism panel 1, which is basically present in existing mechanisms, a closing indicator switch 2 and a opening indicator switch 3 for external output indication. These two auxiliary switches serve as output indications for the high-voltage switch, reflecting the opening and closing status of the high-voltage switch to ensure the safety of the operator. Opening and closing linkage crank arms 4 are correspondingly installed on the switch shafts of the opening and closing indicator switches. The opening and closing linkage crank arms 4 are synchronously connected by a connecting rod 5 to form a parallelogram mechanism. The linkage mechanism formed by the connecting rod 5 and the linkage crank arms 4 enables opening and closing of the circuit. The synchronous movement between the indicator switches ensures that when the open indicator switch 3 is closed, the closed indicator switch 2 is open. The motor 20 provides driving force to this mechanism, allowing the lead screw 7, which is mounted parallel to the inner side of the mechanism panel 1, to rotate. The lead screw 7 has advantages such as high load-bearing capacity, simple structure, and easy operation. A nut 8 is mounted on the lead screw 7, and the nut 8 reciprocates through a threaded transmission with the lead screw 7. The installation of the nut 8 and the lead screw 7 is relatively simple, and the threaded connection between them is reliable and has high transmission stability. Rotation or reversal can move the nut 8 forward or backward. A lever 11 is mounted on the nut 8. An output shaft 9 for driving the high-voltage switch to open or close is rotatably mounted on the radial side of the lead screw 7 on the mechanism panel 1. A radially extending fork 10 is mounted on the output shaft 9. The lever 11 moves back and forth with the nut 8, driving the fork 10. The lever 11 drives the fork 10 to reciprocate, thereby rotating the output shaft 9. The fork 10 has an open position corresponding to the high-voltage switch's open position and a closed position corresponding to the high-voltage switch's closed position. The nut 8 is mounted on the lead screw 7. The upper part of the lever 10 is provided with overtravel for both the open and closed positions, which corresponds to the closing stroke of the open indicator switch 3 and the closed indicator switch 2. The lever 11 is connected to the connecting rod 5 via a swing connecting plate 6 mounted on the mechanism panel 1. When the lever 10 is in the closed position, the closed indicator switch 2 is just closed; when the lever 10 is in the open position, the open indicator switch 3 is just open. By setting the overtravel, when the lever 11 and the lever 10 cooperate to drive the high-voltage switch to open, the lever 11 will separate from the lever 10. At this time, the lead screw 7 continues to drive the nut 8 to move. Figure 1-2 The diagram shows that the tripping indicator switch 3 will be closed. When the lever 11 and the fork 10 work together to close the high-voltage switch, the lever 11 will separate from the fork 10. At this time, the lead screw 7 will continue to drive the nut to move, thus closing the tripping indicator switch 2.

[0023] As a preferred implementation method, such as Figure 2-4As shown, the swing connecting plate 6 is provided with a lever engagement groove 12. The lever engagement groove 12 includes a U-shaped middle section 13 and opening corresponding sections 14 and closing corresponding sections 15 at both ends of the middle section 13. When the high-voltage switch is in the middle position, the middle section 13 is parallel to the lead screw 7. At this time, the lever 11 only drives the fork 10 to rotate. When the high-voltage switch is opened, the lever 11 reaches the opening corresponding section 14 and cooperates with it to drive the opening indicator switch 3 to close. When the lever 11 continues to move to the limit position of the lever engagement groove 12, that is, when the U-shaped groove is vertical... When the high-voltage switch is closed, the lever 11 reaches the closing section 15 and works with it to drive the closing indicator switch 2 to close. When the lever 11 continues to move to the limit position of the lever 11 and the groove 12, that is, the vertical closing section 15 on the other side of the U-shaped groove, the closing indicator switch 2 is driven to close. The U-shaped groove design can make the area of ​​the swing connecting plate 6 smaller, saving space. It can also use its parallel middle section 13 to keep the opening and closing indicator switches in a state of neither opening nor closing.

[0024] As a preferred implementation method, such as Figure 2-4 As shown, the side of the swing connecting plate 6 away from the open / close indicator switch has a protruding handle 16, which is swung and mounted on the mechanism panel 1. The handle 16 is designed to reduce the surface area of ​​the swing connecting plate 6 to reduce its weight, and to drive the swing connecting plate 6 to rotate around the upper end of the handle 16 on the mechanism panel 1, avoiding the entire swing connecting plate 6 being directly connected to the mechanism panel 1. In other embodiments, rods or other similar strip-shaped components can be used to achieve the same effect.

[0025] As a preferred implementation method, such as Figure 2-4 As shown, the side of the swing plate 6 near the open / close indicator switch has an output arm 17 protruding. The output arm 17 has an elongated hole 18 and is connected to the connecting rod 5 through the elongated hole 18. The output arm 17 and the plate handle 16 have basically the same effect, both of which can reduce the weight of the swing plate 6. In addition, the elongated hole 18 at the upper end of the output arm 17 can accommodate the movement path of the connecting rod 5, and the distance inside the elongated hole 18 is sufficient to facilitate the installation and disassembly of the connecting rod 5. In other embodiments, the length of the elongated hole 18 can be set according to the path required by the linkage mechanism of the open / close indicator switch during movement.

[0026] As a preferred implementation method, such as Figure 2-4As shown, the output arm 17 is connected to one of the open / close indicator switches and the connecting rod 5 via the same pin 19. The linkage crank arm 4 of the open / close indicator switch is synchronously connected via the connecting rod 5. Therefore, only one needs to be connected, and the other will also move accordingly. Using the same pin 19 makes installation convenient, saves space in the connection position, and has higher structural stability. Furthermore, the pin 19 is placed in the elongated hole 18 of the output arm 17 and moves along the elongated hole 18. When the swing connecting plate 6 moves, the open / close indicator switch is swinged accordingly by utilizing the rotatable characteristic of the pin 19 to complete the closing or opening process. In other embodiments, both the open / close indicator switches can be connected to the output arm 17, which would require adding another output arm 17, making the structure more complicated, but the above purpose can still be achieved.

[0027] The electric operating mechanism of this invention is used in the following specific way: Figure 2 As shown, when the closing indicator switch 2 is closed, after receiving the closing command, the motor 20 drives the lead screw 7 to rotate, thereby moving the nut 8 on the lead screw 7. The lever 11 on the nut 8 then drives the swing connecting plate 6 to swing. Simultaneously, the swing connecting plate 6 drives the connecting rod 5 to position the open / close indicator switch in the intermediate position between the two. Figure 3 As shown, nut 8 continues to move and drives shift fork 10 to rotate. At this time, swing connecting plate 6 remains parallel to mechanism panel 1 and does not swing. When shift fork 10 reaches the closed position, closing indicator switch 2 is just closed, and lever 11 separates from shift fork 10. When lever 11 continues to move to the limit position of lever engagement groove 12 of swing connecting plate 6, closing indicator switch 2 is fully closed. This completes the entire closing operation of closing indicator switch 2. Figure 4 As shown, the closing process of the tripping indicator switch 3 is the same as the former, but the direction of movement is reversed.

[0028] An embodiment of the high-voltage switch of the present invention is as follows: A high-voltage switch includes an electric operating mechanism, which includes a mechanism panel 1 and an opening indicator switch 3 and an closing indicator switch 2 for indicating the opening and closing of the high-voltage switch. An embodiment of the electric operating mechanism has been described above and will not be repeated here.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. An electric operating mechanism, comprising a mechanism panel, a tripping indicator switch, and a closing indicator switch, wherein tripping and closing linkage crank arms are correspondingly mounted on the switch shafts of the tripping and closing indicator switches, and the tripping and closing linkage crank arms are synchronously connected by a connecting rod to form a parallelogram mechanism, characterized in that, A lead screw is mounted parallel to the inner side of the mechanism panel, a nut is mounted on the lead screw, and a lever is mounted on the nut. An output shaft for driving the opening and closing of the high-voltage switch is also rotatably mounted on the radial side of the lead screw on the mechanism panel. A radially extending fork is mounted on the output shaft. The lever moves back and forth with the nut to drive the fork. The fork has an open position corresponding to the open position of the high-voltage switch and a closed position corresponding to the closed position of the high-voltage switch. The nut on the lead screw has an overtravel corresponding to the open and closed positions of the fork. This overtravel corresponds to the closing stroke of the open indicator switch and the closed indicator switch. The lever is connected to the connecting rod through a swing plate mounted on the mechanism panel. When the fork is in the closed position, the closed indicator switch is just closed. When the fork is in the open position, the open indicator switch is just open.

2. The electric operating mechanism according to claim 1, characterized in that, The swing plate is provided with a lever engagement groove, which includes a U-shaped middle section and opening and closing corresponding sections at both ends of the middle section. When the high-voltage switch is in the middle position, the middle section is parallel to the lead screw. When the high-voltage switch is in the opening position, the lever reaches the opening corresponding section and cooperates with it to drive the opening indicator switch to close. When the high-voltage switch is in the closing position, the lever reaches the closing corresponding section and cooperates with it to drive the closing indicator switch to close.

3. The electric operating mechanism according to claim 2, characterized in that, The side of the swing plate away from the open / close indicator switch has a protruding handle, which is mounted on the mechanism panel by swinging the handle.

4. The electric operating mechanism according to claim 2 or 3, characterized in that, An output arm protrudes from one side of the swing plate near the open / close indicator switch. The output arm has an elongated hole and is connected to the connecting rod through the elongated hole.

5. The electric operating mechanism according to claim 4, characterized in that, The output arm is connected to one of the open / close indicator switches and the connecting rod via the same pin.

6. A high-voltage switch, comprising an electrically operated mechanism, the electrically operated mechanism including a mechanism panel and an open indicator switch and a close indicator switch for indicating the opening and closing of the high-voltage switch, characterized in that, The opening and closing indicator switches are equipped with corresponding opening and closing linkage crank arms on their switch shafts. These crank arms are synchronously connected via connecting rods to form a parallelogram mechanism. A lead screw is installed parallel to the inner side of the mechanism panel, and a nut is installed on the lead screw. A lever is mounted on the nut. An output shaft for driving the opening and closing of the high-voltage switch is rotatably mounted on the radial side of the lead screw on the mechanism panel. A radially extending fork is mounted on the output shaft. The lever moves back and forth with the nut to drive the fork. The fork has an opening position corresponding to the opening position of the high-voltage switch and a closing position corresponding to the closing position of the high-voltage switch. The nut on the lead screw has an overtravel corresponding to the opening and closing positions of the fork. This overtravel corresponds to the closing stroke of the opening and closing indicator switches. The lever is connected to the connecting rod via a swing plate mounted on the mechanism panel. When the lever is in the closing position, the closing indicator switch is just closed; when the lever is in the opening position, the opening indicator switch is just open.

7. The high-voltage switch according to claim 6, characterized in that, The swing plate is provided with a lever engagement groove, which includes a U-shaped middle section and opening and closing corresponding sections at both ends of the middle section. When the high-voltage switch is in the middle position, the middle section is parallel to the lead screw. When the high-voltage switch is in the opening position, the lever reaches the opening corresponding section and cooperates with it to drive the opening indicator switch to close. When the high-voltage switch is in the closing position, the lever reaches the closing corresponding section and cooperates with it to drive the closing indicator switch to close.

8. The high-voltage switch according to claim 7, characterized in that, The side of the swing plate away from the open / close indicator switch has a protruding handle, which is mounted on the mechanism panel by swinging the handle.

9. The high-voltage switch according to claim 7 or 8, characterized in that, An output arm protrudes from one side of the swing plate near the open / close indicator switch. The output arm has an elongated hole and is connected to the connecting rod through the elongated hole.

10. The high-voltage switch according to claim 9, characterized in that, The output arm is connected to one of the open / close indicator switches and the connecting rod via the same pin.

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