Vacuum circuit breaker and control method thereof

Abstract

The present application relates to the field of vacuum circuit breaker, specifically to a kind of vacuum circuit breaker and control method thereof.The vacuum circuit breaker comprises a known insulating shell, a fixed end cover plate, a static contact, a movable end cover plate, a movable contact and a bellows, and further comprises a supporting mechanism, which comprises a supporting box, a stop mechanism connected to the supporting box, an engaging long shaft coaxially fixedly connected to the movable contact, a poking mechanism connected to the engaging long shaft, comprising a poking clamping plate and a pressing pin shaft, and a pulling mechanism comprising a handle.In closing the valve, the static contact and the movable contact are in contact, and in opening the valve, the movable contact and the static contact are separated;in closing the valve, the operator pulls down the handle, at this time, the poking clamping plate moves upward, the movable contact moves upward and contacts the static contact to complete the closing work;in opening the valve, the operator presses the pressing pin shaft, at this time, the poking clamping plate moves downward, the movable contact moves downward and separates from the static contact to complete the opening work.

Description

Technical Field

[0001] This invention relates to the field of vacuum circuit breakers, and more specifically to a vacuum circuit breaker and its control method. Background Technology

[0002] Vacuum circuit breakers are named for their high-vacuum arc-extinguishing medium and the insulating medium between the contacts after arc extinguishing. They are widely used in power distribution networks due to their advantages of small size, light weight, suitability for frequent operation, and maintenance-free arc extinguishing. Existing vacuum circuit breakers generally consist of stationary and moving contacts. The moving contact is driven up and down by a drive arm to achieve the opening and closing operation. The drive plate is usually perpendicular to the insulating rod. This existing structure, due to the need to transmit power between two vertical components, inevitably creates significant stress concentration at the intersection of the two components. Therefore, in practice, this part of the component often needs to be repaired and replaced, which wastes time and money. Furthermore, the rigid contact between the moving and stationary contacts during this process can cause damage to both, which is detrimental to the long-term use of the vacuum circuit breaker and affects its service life.

[0003] Because the vacuum interrupter is under negative pressure, when no external force is applied, the moving contact inside the vacuum interrupter generates a closing force on the inner cavity under the action of the pressure difference, causing it to close with the stationary contact. This force is called the self-closing force. The large self-closing force hinders the opening operation of the vacuum circuit breaker, increases the work required for opening, thus affecting the opening speed of the vacuum circuit breaker, and also increases the labor intensity of the staff.

[0004] Therefore, it is necessary for us to provide and design a vacuum circuit breaker and its control method. Summary of the Invention

[0005] Therefore, it is necessary to provide a vacuum circuit breaker and its control method to address the existing technical problems.

[0006] To address the problems in the existing technology, the technical solution adopted by this invention is as follows:

[0007] A vacuum circuit breaker, comprising:

[0008] The insulating outer casing is installed vertically.

[0009] The fixed end cover plate is coaxially fixed inside the insulating shell and fixedly connected to the upper wall of the insulating shell;

[0010] The stationary contact is fixedly connected to the fixed end cover plate along the same axis.

[0011] The moving end cover plate is coaxially fixed inside the insulating shell and fixedly connected to the lower end of the insulating shell;

[0012] The moving contact is slidably connected to the moving end cover plate along the same axis.

[0013] A bellows is coaxially fixedly sleeved on the outside of the moving contact;

[0014] Also includes:

[0015] The support mechanism is located below the insulating shell and includes a support box and a support bracket. The support bracket is fixedly connected to the lower end of the insulating shell, and the support box is fixedly connected to the lower end of the support bracket.

[0016] The stop mechanism, connected to the support box, includes a connecting long shaft, a snap-fit ​​base, and a pressing base. The connecting long shaft is fixedly connected to the moving contact along the same axis. The snap-fit ​​base is slidably connected to the connecting long shaft. The pressing base is located below the snap-fit ​​base and is keyed to the connecting long shaft.

[0017] The actuating mechanism, connected to the connecting long shaft, includes an actuating plate, a transition support rod, a first connecting shaft, a second connecting shaft, a third connecting shaft, a pressing pin, and a positioning sleeve. The actuating plate is located between the locking base and the pressing base. One end of the transition support rod is hinged to one end of the actuating plate. The first connecting shaft is vertically located at the upper end of the other end of the transition support rod. The second connecting shaft is coaxially located at the upper end of the first connecting shaft. The third connecting shaft is coaxially located at the upper end of the second connecting shaft. The positioning sleeve is coaxially located outside the second connecting shaft. The pressing pin is horizontally slidably located in the lower middle part of the positioning sleeve.

[0018] The lifting assembly includes a connecting rod and a pulling mechanism. One end of the connecting rod is hinged to one end of a third connecting shaft, and the pulling mechanism is hinged to the other end of the connecting rod. The pulling mechanism includes a handle, which is set in a vertical position.

[0019] It supports the frame, provides support, and is fixedly connected to the support box.

[0020] Furthermore, the interior of the support box is formed with a valve channel arranged vertically and a positioning channel arranged horizontally. The stopping mechanism also includes a push spring, an arc-shaped locking block, a positioning contact rod, and a connecting sleeve. The connecting long shaft is arranged coaxially with the valve channel. The arc-shaped locking block is keyed to the upper part of the connecting long shaft. The connecting sleeve is slidably connected to the lower part of the connecting long shaft. The connecting sleeve is also connected to the upper end of the locking base. One end of the push spring abuts against the arc-shaped locking block, and the other end abuts against the connecting sleeve. The positioning contact rod is slidably connected to the positioning channel. The end of the positioning contact rod near the connecting long shaft is formed with a locking plane and a locking bevel. The locking plane abuts against the upper end of the arc-shaped locking block.

[0021] Furthermore, the stopping mechanism also includes a pressing spring, a movable contact rod, a return spring, and a positioning support. The pressing spring is sleeved on the outside of the connecting sleeve. The upper end of the pressing spring abuts against the lower end of the support box, and the lower end abuts against the snap-fit ​​base. A triangular connecting part is formed on the snap-fit ​​base. The movable contact rod is connected to the triangular connecting part. A curved inclined surface is formed on the upper end of the movable contact rod. A trigger groove is formed in the middle of the positioning contact rod. The curved inclined surface abuts against the trigger groove. The positioning support is coaxially arranged with the positioning channel. One end of the return spring abuts against the positioning contact rod, and the other end abuts against the positioning support.

[0022] Furthermore, the center of the actuating plate is formed with a locking through hole, which is slidably connected to the connecting long shaft. The actuating mechanism also includes two fork-shaped connecting rods and two locking pins. The supporting mechanism also includes two first positioning frames, which are symmetrically arranged at the lower end of the supporting box. The two fork-shaped connecting rods are fixedly connected to the two first positioning frames respectively. Each of the two fork-shaped connecting rods has a limit through hole formed on it. The two locking pins are fixedly connected to both sides of the actuating plate respectively, and the two locking pins are slidably connected to the limit through holes respectively.

[0023] Furthermore, the supporting mechanism also includes a second positioning frame, with the middle part of the transition support rod hinged to the lower end of the second positioning frame. The actuating mechanism also includes a limiting slider, a positioning spring, and two limiting pins. The positioning spring is sleeved outside the first connecting shaft, with its lower end abutting against the connecting sleeve and its upper end abutting against the second connecting shaft. A limiting groove is formed at the end of the transition support rod away from the fork-shaped connecting rod, and the limiting slider is slidably connected to the limiting groove. The upper end of the limiting slider is hinged to the lower end of the first connecting shaft. The two limiting pins pass through the limiting groove and are fixedly connected to the transition support rod. The limiting slider is slidably connected to the two limiting pins. A positioning flange is formed at the lower part of the first connecting shaft, and the positioning flange abuts against the lower end of the positioning sleeve.

[0024] Furthermore, a positioning groove is formed on the side wall of the second connecting shaft, and a first slot and a second slot are formed on the side wall of the positioning sleeve. The actuating mechanism also includes a spring card, the lower end of which is fixedly connected to the positioning groove, and the upper end of which is formed with a trapezoidal pressing part, which can alternately engage with the first slot and the second slot.

[0025] Furthermore, the actuating mechanism also includes a pressing spring, a positioning connector, and a pressing circular plate. The positioning connector is fixedly installed outside the second slot and is fixedly connected to the positioning sleeve. The interior of the positioning connector is formed with an inner cavity. The pressing pin is slidably connected to the inner cavity. The pressing circular plate is fixedly connected to one end of the pressing pin that extends into the inner cavity. The pressing spring is sleeved outside the pressing pin. One end of the pressing spring abuts against the pressing circular plate, and the other end abuts against the inner cavity. The pressing circular plate can abut against the trapezoidal pressing part.

[0026] Furthermore, the lifting assembly also includes a fixed support, which is fixedly hoisted to the upper end of the support frame. The fixed support is hinged to the middle of the connecting rod. The pulling mechanism also includes a first roller, a first pull rope, a second roller, a third roller, and a second pull rope. The first roller is rotatably connected to the end of the connecting rod away from the third connecting shaft. The second roller is rotatably positioned above the support frame. One end of the first pull rope is connected to the second roller, and the other end is connected to the first roller. The third roller is coaxially fixed to the second roller. One end of the second pull rope is connected to the third roller, and the other end is connected to the handle.

[0027] A control method for a vacuum circuit breaker further includes the following steps:

[0028] S1: When the valve is closed, the stationary contact and the moving contact are against each other; when the valve is opened, the moving contact and the stationary contact are separated.

[0029] S2: When closing the valve, the operator pulls the handle down, which moves the lever upward and the moving contact moves upward to contact the stationary contact, thus completing the valve closing operation.

[0030] S3: When opening the valve, the operator touches and presses the pin shaft. At this time, the moving plate moves downward, and the moving contact moves downward and separates from the stationary contact box to complete the valve opening operation.

[0031] The beneficial effects of this invention compared to the prior art are:

[0032] Firstly, in this device, pulling the handle moves the moving contact upward to close the valve, while pressing the pressing pin moves the moving contact downward to open the valve. During this process, the upward movement of the moving contact is achieved with the help of a force-saving pulley system, which reduces the operator's workload. The downward movement of the moving contact only requires pressing the pressing pin, which greatly reduces the operator's workload.

[0033] Secondly, when the valve is closed, the connecting long axis moves upward by means of the propulsion spring. During this process, the contact between the moving contact and the stationary contact is buffered by the propulsion spring to avoid hard contact between the moving contact and the stationary contact, which would affect their service life.

[0034] Thirdly, when the valve is opened, the elastic force of the positioning spring will counteract and neutralize the self-closing force, causing the moving contact to be subjected to downward force. This not only increases the valve opening speed but also requires less labor from the staff, greatly saving manpower. Attached Figure Description

[0035] Figure 1 This is an isometric view of the three-dimensional structure of the embodiment.

[0036] Figure 2 yes Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0037] Figure 3 This is a plan view of the embodiment after removing the supporting frame;

[0038] Figure 4 This is an exploded three-dimensional structural diagram of the first connecting shaft, the second connecting shaft, and the third connecting shaft in the embodiment;

[0039] Figure 5 This is an exploded three-dimensional structural diagram of the stop mechanism in the embodiment;

[0040] Figure 6 yes Figure 5 Enlarged schematic diagram of the structure at point B;

[0041] Figure 7 This is a top view of the embodiment after removing the support frame and lifting assembly;

[0042] Figure 8 yes Figure 7 Cross-sectional view of the structure at point CC.

[0043] The numbers on the map are:

[0044] 1. Support frame; 2. Insulating housing; 3. Stationary contact; 4. Fixed end cover plate; 5. Bellows; 6. Moving end cover plate; 7. Moving contact; 8. Support mechanism; 9. Support box; 10. Valve passage; 11. Positioning passage; 12. Support bracket; 13. First positioning frame; 14. Second positioning frame; 15. Stopping mechanism; 16. Connecting long shaft; 17. Push spring; 18. Arc-shaped locking block; 19. Connecting sleeve; 20. Snap-fit ​​base; 21. Triangular connection part; 22. Contact spring; 23. Contact base; 24. Movable contact rod; 25. Curved inclined surface; 26. Positioning contact rod; 27. Snap-fit ​​plane; 28. Snap-fit ​​inclined surface; 29. ​​Trigger groove; 30. Return spring; 31. Positioning support; 32. Actuating mechanism; 33. Actuating locking plate; 34. Snap-fit ​​through hole; 35. 36. Snap-fit ​​pin; 37. Fork-shaped connecting rod; 38. Limiting through hole; 39. Adapter support rod; 40. Limiting slide groove; 41. Limiting pin; 42. Limiting slider; 43. First connecting shaft; 44. Positioning flange; 45. Positioning spring; 46. Second connecting shaft; 47. Positioning slide groove; 48. Spring clip; 49. Trapezoidal pressing part; 50. Third connecting shaft; 51. Pressing pin; 52. Pressing spring; 53. Positioning sleeve; 54. First slot; 55. Second slot; 56. Positioning connecting seat; 57. Accommodating cavity; 58. Pressing round plate; 59. Lifting assembly; 60. Connecting pull rod; 61. Fixed support; 62. Pulling mechanism; 63. First pull rope; 64. Second roller; 65. Third roller; 66. Second pull rope; 67. Handle. Detailed Implementation

[0045] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0046] refer to Figures 1 to 8 A vacuum circuit breaker, comprising:

[0047] The insulating outer casing 2 is installed in a vertical position;

[0048] The fixed end cover plate 4 is coaxially fixedly installed inside the insulating shell 2 and fixedly connected to the upper wall of the insulating shell 2;

[0049] The stationary contact 3 is fixedly connected to the fixed end cover plate 4 along the same axis.

[0050] The moving end cover 6 is coaxially fixed inside the insulating shell 2 and fixedly connected to the lower end of the insulating shell 2;

[0051] The moving contact 7 is slidably connected to the moving end cover 6 along the same axis;

[0052] The bellows 5 is coaxially fixedly sleeved on the outside of the moving contact 7;

[0053] Also includes:

[0054] The support mechanism 8 is located below the insulating shell 2 and includes a support box 9 and a support bracket 12. The support bracket 12 is fixedly connected to the lower end of the insulating shell 2, and the support box 9 is fixedly connected to the lower end of the support bracket 12.

[0055] The stop mechanism 15 is connected to the support box 9 and includes a connecting long shaft 16, a snap-fit ​​base 20 and a pressing base 23. The connecting long shaft 16 is fixedly connected to the moving contact 7 along the same axis. The snap-fit ​​base 20 is slidably connected to the connecting long shaft 16. The pressing base 23 is located below the snap-fit ​​base 20 and is keyed to the connecting long shaft 16.

[0056] The actuating mechanism 32, connected to the connecting long shaft 16, includes an actuating plate 33, a connecting rod 38, a first connecting shaft 42, a second connecting shaft 45, a third connecting shaft 49, a pressing pin 50, and a positioning sleeve 52. The actuating plate 33 is disposed between the locking base 20 and the pressing base 23. One end of the connecting rod 38 is hinged to one end of the actuating plate 33. The first connecting shaft 42 is vertically disposed at the upper end of the other end of the connecting rod 38. The second connecting shaft 45 is coaxially disposed at the upper end of the first connecting shaft 42. The third connecting shaft 49 is coaxially disposed at the upper end of the second connecting shaft 45. The positioning sleeve 52 is coaxially disposed outside the second connecting shaft 45. The pressing pin 50 is horizontally slidably disposed in the lower middle part of the positioning sleeve 52.

[0057] The lifting assembly 58 includes a connecting rod 59 and a pulling mechanism 61. One end of the connecting rod 59 is hinged to one end of the third connecting shaft 49, and the pulling mechanism 61 is hinged to the other end of the connecting rod 59. The pulling mechanism 61 includes a handle 67, which is set in a vertical position.

[0058] The support frame 1 serves a supporting function and is fixedly connected to the support box 9.

[0059] When the valve is closed, the moving contact 7 moves upward to abut against the stationary contact 3. When the valve is opened, the moving contact 7 moves downward to separate from the stationary contact 3. To prevent damage to either the moving contact 7 or the stationary contact 3 due to hard contact during valve closure, the operator pulls the handle 67 downward when closing the valve. The downward movement of the handle 67 moves the connecting rod 59, which in turn moves the connected third connecting shaft 49 vertically downward. This downward movement of the third connecting shaft 49 then moves the connected second connecting shaft 45. This will cause the first connecting shaft 42 connected to it to move. The movement of the first connecting shaft 42 will cause the adapter rod 38 below it to rotate. The rotation of the adapter rod 38 will cause the actuating plate 33 hinged to it to move vertically upward. After the actuating plate 33 moves upward, it will push the locking base 20 to move upward. After the locking base 20 moves upward, it will cause the connecting long shaft 16 to move upward (the specific movement process will be explained in the working principle section). After the connecting long shaft 16 moves, it will cause the moving contact 7 connected to it to move upward. After the moving contact 7 moves, it will press against the stationary contact 3, and at this time the valve is closed. When opening the valve, in order to improve the speed and efficiency of valve opening, the operator only needs to press the pressing pin 50. After the pressing pin 50 moves, it will drive the first connecting shaft 42 to move upward (the specific movement process is explained in the working principle section). The upward movement of the first connecting shaft 42 will drive the toggle plate 33 to move downward. After the toggle plate 33 moves downward, it will abut against the upper end of the contact base 23. As the toggle plate 33 moves, the contact base 23 will drive the connecting long shaft 16 to move downward. Finally, the connecting long shaft 16 will drive the moving contact 7 to separate from the stationary contact 3, thus completing the valve opening action.

[0060] To ensure that no hard contact occurs when the moving contact 7 and the stationary contact 3 come into contact, the following features are specifically designed:

[0061] The support box 9 has a vertically arranged valve channel 10 and a horizontally arranged positioning channel 11 inside. The stop mechanism 15 also includes a push spring 17, an arc-shaped locking block 18, a positioning contact rod 26 and a connecting sleeve 19. The connecting long shaft 16 is coaxially arranged with the valve channel 10. The arc-shaped locking block 18 is keyed to the upper part of the connecting long shaft 16. The connecting sleeve 19 is slidably connected to the lower part of the connecting long shaft 16. The connecting sleeve 19 is also connected to the upper end of the locking base 20. One end of the push spring 17 abuts against the arc-shaped locking block 18 and the other end abuts against the connecting sleeve 19. The positioning contact rod 26 is slidably connected to the positioning channel 11. The end of the positioning contact rod 26 near the connecting long shaft 16 has a locking plane 27 and a locking slope 28. The locking plane 27 abuts against the upper end of the arc-shaped locking block 18. When the device is in the open valve state, the upper end of the arc-shaped locking block 18 abuts against the locking surface 27. When the positioning contact rod 26 moves, the push spring 17 returns to its original deformation and pushes the arc-shaped locking block 18 upward. At this time, the arc-shaped locking block 18 disengages from the positioning contact rod 26. When the device switches from the open valve state to the closed valve state, the connecting long shaft 16 moves downward, which drives the arc-shaped locking block 18 downward. At this time, the side wall of the arc-shaped locking block 18 abuts against the locking inclined surface 28, ensuring that the movement of the arc-shaped locking block 18 will not be jammed. This completes the switching of the device from open to closed valve. During this process, the push spring 17 ensures that the moving contact 7 and the stationary contact 3 do not make hard contact, avoiding damage to both.

[0062] To ensure that valve closing and opening operations can be completed continuously, the following features are specifically designed:

[0063] The stopping mechanism 15 also includes a pressing spring 22, a movable contact rod 24, a return spring 30, and a positioning support 31. The pressing spring 22 is sleeved on the outside of the connecting sleeve 19. The upper end of the pressing spring 22 abuts against the lower end of the support box 9, and the lower end abuts against the snap-fit ​​base 20. A triangular connecting part 21 is formed on the snap-fit ​​base 20. The movable contact rod 24 is connected to the triangular connecting part 21. A curved inclined surface 25 is formed on the upper end of the movable contact rod 24. A trigger groove 29 is formed in the middle of the positioning contact rod 26. The curved inclined surface 25 abuts against the trigger groove 29. The positioning support 31 is coaxially arranged with the positioning channel 11. One end of the return spring 30 abuts against the positioning contact rod 26, and the other end abuts against the positioning support 31. When valve closure is required, the locking base 20 moves upward, causing the movable contact rod 24 to move upward as well. The movable contact rod 24, moving upward, comes into contact with the trigger groove 29 via the curved inclined surface 25. At this point, the movable contact rod 24 moves away from the axis of the connecting long axis 16. As mentioned earlier, the moving contact 7 contacts the stationary contact 3, completing valve closure. During this process, the contact spring 22 ensures that the connecting sleeve 19 returns to its original position after movement, while the return spring 30 ensures that the positioning contact rod 26 returns to its original position after movement, facilitating the subsequent valve opening operation and allowing for continuous valve closure and opening.

[0064] To prevent the toggle plate 33 from deflecting during its up-and-down movement, thus failing to apply force correctly to the latching base 20 and the contact base 23, the following features are specifically provided:

[0065] The center of the actuating plate 33 is formed with a locking through hole 34, which is slidably connected to the connecting long shaft 16. The actuating mechanism 32 also includes two fork-shaped connecting rods 36 and two locking pins 35. The supporting mechanism 8 also includes two first positioning frames 13, which are symmetrically arranged at the lower end of the supporting box 9. The two fork-shaped connecting rods 36 are fixedly connected to the two first positioning frames 13 respectively. Each of the two fork-shaped connecting rods 36 has a limiting through hole 37 formed on it. The two locking pins 35 are fixedly connected to both sides of the actuating plate 33 respectively, and the two locking pins 35 are slidably connected to the limiting through holes 37 respectively. When the device is running, when the actuating plate 33 moves up and down, since the movement of the actuating plate 33 is an arc trajectory, the actuating plate 33 needs to be slidably connected to the two limiting through holes 37 through the two locking pins 35 during the movement, so as to prevent the actuating plate 33 from deflecting during the up and down movement, so as not to be able to apply force to the locking base 20 and the pressing base 23 correctly.

[0066] In order to enable the toggle plate 33 to move vertically and to ensure that the second connecting shaft 45 can automatically move upward and reset when the valve is opened, the following features are specifically designed:

[0067] The supporting mechanism 8 also includes a second positioning frame 14. The middle part of the transition support rod 38 is hinged to the lower end of the second positioning frame. The actuating mechanism 32 also includes a limiting slider 41, a positioning spring 44, and two limiting pins 40. The positioning spring 44 is sleeved on the outside of the first connecting shaft 42. The lower end of the positioning spring 44 abuts against the connecting sleeve 19, and the upper end abuts against the second connecting shaft 45. The end of the transition support rod 38 away from the fork-shaped connecting rod 36 is formed with a limiting groove 39. The limiting slider 41 is slidably connected to the limiting groove 39. The upper end of the limiting slider 41 is hinged to the lower end of the first connecting shaft 42. The two limiting pins 40 pass through the limiting groove 39 and are fixedly connected to the transition support rod 38. The limiting slider 41 is slidably connected to the two limiting pins 40. The lower part of the first connecting shaft 42 is formed with a positioning flange 43, which abuts against the lower end of the positioning sleeve 52. When the device is running, in order to drive the actuating plate 33 to move vertically, the first connecting shaft 42 will drive the limiting slider 41 to move when it moves vertically. As mentioned above, the movement of the two ends of the adapter rod 38 is an arc curve. Therefore, when the first connecting shaft 42 moves downward, it will drive the limiting slider 41 to move, so as to prevent the adapter rod 38 from getting stuck when the first connecting shaft 42 drives the adapter rod 38 to rotate. The positioning spring 44 can make the first connecting shaft 42 push the second connecting shaft 45 to move upward by restoring its deformation when the valve is opened.

[0068] To prepare for rapid valve opening, the following features were specifically designed:

[0069] The second connecting shaft 45 has a positioning groove 46 formed on its side wall, and the positioning sleeve 52 has a first locking groove 53 and a second locking groove 54 formed on its side wall. The actuating mechanism 32 also includes a spring clip 47. The lower end of the spring clip 47 is fixedly connected to the positioning groove 46, and the upper end of the spring clip 47 has a trapezoidal pressing part 48 formed. The trapezoidal pressing part 48 can alternately engage with the first locking groove 53 and the second locking groove 54. When the second connecting shaft 45 does not move, the moving contact 7 and the stationary contact 3 are separated, the device is in the open valve state, and the trapezoidal pressing part 48 is engaged with the first locking groove 53. When it is necessary to close the valve, the second connecting shaft 45 moves downward until the trapezoidal pressing part 48 is engaged with the second locking groove 54. At this time, the valve closing work is completed, preparing for the subsequent rapid valve opening.

[0070] To facilitate rapid valve opening, the following features are specifically designed:

[0071] The actuating mechanism 32 also includes a pressing spring 51, a positioning connector 55, and a pressing disc 57. The positioning connector 55 is fixedly disposed outside the second slot 54 and is fixedly connected to the positioning sleeve 52. The positioning connector 55 has an inner cavity 56 formed inside. The pressing pin 50 is slidably connected to the inner cavity 56. The pressing disc 57 is fixedly connected to one end of the pressing pin 50 that extends into the inner cavity 56. The pressing spring 51 is sleeved outside the pressing pin 50. One end of the pressing spring 51 abuts against the pressing disc 57, and the other end abuts against the inner cavity 56. The pressing disc 57 can abut against the trapezoidal pressing part 48. When the trapezoidal pressing part 48 extends into the second slot 54, in order to increase the valve opening speed, the operator only needs to press the pressing pin 50. The movement of the pressing pin 50 will drive the pressing disc 57 to move. After the pressing disc 57 moves, it will push the trapezoidal pressing part 48. At this time, the trapezoidal pressing part 48 will disengage from the second slot 54. Then, the second connecting shaft 45 moves upward under the action of the positioning spring 44. As can be seen from the previous text, the upward movement of the second connecting shaft 45 will cause the moving contact 7 to disengage from the stationary contact 3, thus completing the rapid valve opening.

[0072] To achieve a labor-saving effect and make it easier for operators to close the valve, the following features are specifically designed:

[0073] The lifting assembly 58 also includes a fixed support 60, which is fixedly hoisted to the upper end of the support frame 1. The fixed support 60 is hinged to the middle of the connecting rod 59. The pulling mechanism 61 also includes a first roller 62, a first pull rope 63, a second roller 64, a third roller 65, and a second pull rope 66. The first roller 62 is rotatably connected to the end of the connecting rod 59 away from the third connecting shaft 49. The second roller 64 is rotatably disposed above the support frame 1. One end of the first pull rope 63 is connected to the second roller 64, and the other end is connected to the first roller 62. The third roller 65 is coaxially fixed to the second roller 64. One end of the second pull rope 66 is connected to the third roller 65, and the other end is connected to the handle 67. When the device is running, the operator pulls down handle 67. The movement of handle 67 causes the third roller 65 to rotate via the second pull rope 66. The rotation of the third roller 65 then causes the connected second roller 64 to rotate. The rotation of the second roller 64, in turn, causes the connected first roller 62 to rotate and move upward via the first pull rope 63. At this time, the connecting rod 59 rotates at its hinge point with the fixed support 60. During this process, the diameter of the second roller 64 should be larger than the diameter of the third roller 65 to achieve a labor-saving effect, making it easier for the operator to close the valve.

[0074] A control method for a vacuum circuit breaker further includes the following steps:

[0075] S1: When the valve is closed, the stationary contact 3 and the moving contact 7 are against each other; when the valve is opened, the moving contact 7 and the stationary contact 3 are separated.

[0076] S2: When closing the valve, the operator pulls the handle 67 downwards. At this time, the card plate 33 moves upwards, and the moving contact 7 moves upwards to contact the stationary contact 3 to complete the valve closing operation.

[0077] S3: When opening the valve, the operator touches and presses the pressing pin 50. At this time, the card plate 33 moves downward, and the moving contact 7 moves downward and separates from the stationary contact 3 to complete the valve opening work.

[0078] The working principle of this device is as follows: When the valve is closed, the moving contact 7 moves upward and abuts against the stationary contact 3. When the valve is opened, the moving contact 7 moves downward and separates from the stationary contact 3. To prevent damage to the moving contact 7 or stationary contact 3 due to hard contact during valve closure, the operator pulls the handle 67 downward when closing the valve. The downward movement of the handle 67 drives the third roller 65 to rotate via the second pull rope 66. The rotation of the third roller 65 drives the second roller 64 connected to it to rotate. The rotation of the second roller 64 drives the first roller 62 connected to it to rotate and move upward via the first pull rope 63. At this time, the connecting rod 59 rotates at the hinge point with the fixed support 60. During this process, the connecting rod 59 drives the third connecting shaft 49 connected to it to move downward in the vertical direction.

[0079] After the third connecting shaft 49 moves, it will drive the first connecting shaft 42 to move downward. During this process, the trapezoidal pressing part 48 of the spring card 47 will be locked in the second card slot 54. Finally, the movement of the first connecting shaft 42 will drive the adapter rod 38 below it to rotate. The rotation of the adapter rod 38 will drive the toggle plate 33 hinged to it to move vertically upward. After the toggle plate 33 moves upward, it will push the locking base 20 to move upward. The locking base 20 moves upward and drives the movable contact rod 24 to move upward. The movable contact rod 24 moves upward and will come into contact with the trigger groove 29 through the curved inclined surface 25. At this time, the movable contact rod 24 will move away from the axis of the connecting long shaft 16. At this time, the arc-shaped locking block 18 will disengage from the positioning contact rod 26. Finally, the connecting long shaft 16 moves upward. After the connecting long shaft 16 moves, it will drive the movable contact 7 connected to it to move upward. After the movable contact 7 moves, it will press against the stationary contact 3, and the valve will be closed.

[0080] To improve the speed and efficiency of valve opening, the operator only needs to press the pressing pin 50. The pressing pin 50 moves, which drives the pressing disc 57 to move. After the pressing disc 57 moves, it pushes the trapezoidal contact part 48. At this time, the trapezoidal contact part 48 will disengage from the second slot 54. Then the second connecting shaft 45 will move upward. The first connecting shaft 42 moves upward, which drives the actuating plate 33 to move downward. After the actuating plate 33 moves downward, it will abut against the upper end of the contact base 23. As the actuating plate 33 moves, the contact base 23 will drive the connecting long shaft 16 to move downward. Finally, the connecting long shaft 16 drives the moving contact 7 to separate from the stationary contact 3, thus completing the valve opening action.

[0081] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A vacuum circuit breaker, characterized in that, include: The insulating outer casing is installed vertically. The fixed end cover plate is coaxially fixed inside the insulating shell and fixedly connected to the upper wall of the insulating shell; The stationary contact is fixedly connected to the fixed end cover plate along the same axis. The moving end cover plate is coaxially fixed inside the insulating shell and fixedly connected to the lower end of the insulating shell; The moving contact is slidably connected to the moving end cover plate along the same axis. A bellows is coaxially fixedly sleeved on the outside of the moving contact; Also includes: The support mechanism is located below the insulating shell and includes a support box and a support bracket. The support bracket is fixedly connected to the lower end of the insulating shell, and the support box is fixedly connected to the lower end of the support bracket. The stop mechanism, connected to the support box, includes a connecting long shaft, a snap-fit ​​base, and a pressing base. The connecting long shaft is fixedly connected to the moving contact along the same axis. The snap-fit ​​base is slidably connected to the connecting long shaft. The pressing base is located below the snap-fit ​​base and is keyed to the connecting long shaft. The actuating mechanism, connected to the connecting long shaft, includes an actuating plate, a transition support rod, a first connecting shaft, a second connecting shaft, a third connecting shaft, a pressing pin, and a positioning sleeve. The actuating plate is located between the locking base and the pressing base. One end of the transition support rod is hinged to one end of the actuating plate. The first connecting shaft is vertically located at the upper end of the other end of the transition support rod. The second connecting shaft is coaxially located at the upper end of the first connecting shaft. The third connecting shaft is coaxially located at the upper end of the second connecting shaft. The positioning sleeve is coaxially located outside the second connecting shaft. The pressing pin is horizontally slidably located in the lower middle part of the positioning sleeve. The lifting assembly includes a connecting rod and a pulling mechanism. One end of the connecting rod is hinged to one end of a third connecting shaft, and the pulling mechanism is hinged to the other end of the connecting rod. The pulling mechanism includes a handle, which is set in a vertical position. It supports the frame, provides support, and is fixedly connected to the support box; The support box has a vertically arranged valve channel and a horizontally arranged positioning channel inside. The stopping mechanism also includes a push spring, an arc-shaped locking block, a positioning contact rod, and a connecting sleeve. The connecting long shaft is arranged coaxially with the valve channel. The arc-shaped locking block is keyed to the upper part of the connecting long shaft. The connecting sleeve is slidably connected to the lower part of the connecting long shaft. The connecting sleeve is also connected to the upper end of the locking base. One end of the push spring abuts against the arc-shaped locking block, and the other end abuts against the connecting sleeve. The positioning contact rod is slidably connected to the positioning channel. The end of the positioning contact rod near the connecting long shaft has a locking plane and a locking bevel. The locking plane abuts against the upper end of the arc-shaped locking block. The stopping mechanism also includes a pressing spring, a movable contact rod, a return spring, and a positioning support. The pressing spring is sleeved on the outside of the connecting sleeve. The upper end of the pressing spring abuts against the lower end of the support box, and the lower end abuts against the snap-fit ​​base. A triangular connecting part is formed on the snap-fit ​​base. The movable contact rod is connected to the triangular connecting part. A curved inclined surface is formed on the upper end of the movable contact rod. A trigger groove is formed in the middle of the positioning contact rod. The curved inclined surface abuts against the trigger groove. The positioning support is coaxially arranged with the positioning channel. One end of the return spring abuts against the positioning contact rod, and the other end abuts against the positioning support. The center of the actuating plate has a locking through hole, which is slidably connected to the connecting long shaft. The actuating mechanism also includes two fork-shaped connecting rods and two locking pins. The supporting mechanism also includes two first positioning frames, which are symmetrically arranged at the lower end of the supporting box. The two fork-shaped connecting rods are fixedly connected to the two first positioning frames respectively. Each of the two fork-shaped connecting rods has a limit through hole. The two locking pins are fixedly connected to both sides of the actuating plate respectively, and the two locking pins are slidably connected to the limit through holes respectively.

2. A vacuum circuit breaker according to claim 1, characterized in that, The supporting mechanism also includes a second positioning frame. The middle part of the transition support rod is hinged to the lower end of the second positioning frame. The actuating mechanism also includes a limiting slider, a positioning spring, and two limiting pins. The positioning spring is sleeved on the outside of the first connecting shaft. The lower end of the positioning spring abuts against the connecting sleeve, and the upper end abuts against the second connecting shaft. The end of the transition support rod away from the fork-shaped connecting rod is formed with a limiting groove. The limiting slider is slidably connected to the limiting groove. The upper end of the limiting slider is hinged to the lower end of the first connecting shaft. The two limiting pins pass through the limiting groove and are fixedly connected to the transition support rod. The limiting slider is slidably connected to the two limiting pins. The lower part of the first connecting shaft is formed with a positioning flange, which abuts against the lower end of the positioning sleeve.

3. A vacuum circuit breaker according to claim 2, characterized in that, The second connecting shaft has a positioning groove formed on its side wall, and the positioning sleeve has a first slot and a second slot formed on its side wall. The actuating mechanism also includes a spring card. The lower end of the spring card is fixedly connected to the positioning groove, and the upper end of the spring card has a trapezoidal pressing part formed. The trapezoidal pressing part can alternately engage with the first slot and the second slot.

4. A vacuum circuit breaker according to claim 3, characterized in that, The actuating mechanism also includes a pressing spring, a positioning connector, and a pressing circular plate. The positioning connector is fixedly installed outside the second slot and is fixedly connected to the positioning sleeve. The interior of the positioning connector is formed with a receiving cavity. The pressing pin is slidably connected to the receiving cavity. The pressing circular plate is fixedly connected to one end of the pressing pin that extends into the receiving cavity. The pressing spring is sleeved outside the pressing pin. One end of the pressing spring abuts against the pressing circular plate, and the other end abuts against the receiving cavity. The pressing circular plate can abut against the trapezoidal contact part.

5. A vacuum circuit breaker according to claim 1, characterized in that, The lifting assembly also includes a fixed support, which is fixedly hoisted to the upper end of the support frame. The fixed support is hinged to the middle of the connecting rod. The pulling mechanism also includes a first roller, a first pull rope, a second roller, a third roller, and a second pull rope. The first roller is rotatably connected to the end of the connecting rod away from the third connecting shaft. The second roller is rotatably positioned above the support frame. One end of the first pull rope is connected to the second roller, and the other end is connected to the first roller. The third roller is coaxially fixed to the second roller. One end of the second pull rope is connected to the third roller, and the other end is connected to the handle.

6. A control method for a vacuum circuit breaker, comprising the vacuum circuit breaker as described in claim 1, characterized in that, It also includes the following steps: S1: When the valve is closed, the stationary contact and the moving contact are against each other; when the valve is opened, the moving contact and the stationary contact are separated. S2: When closing the valve, the operator pulls the handle down, which moves the lever upward and the moving contact moves upward to contact the stationary contact, thus completing the valve closing operation. S3: When opening the valve, the operator touches and presses the pin shaft. At this time, the moving plate moves downward, and the moving contact moves downward and separates from the stationary contact box to complete the valve opening operation.

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