Dual power vacuum circuit breaker

Abstract

This invention discloses a small-sized, highly sensitive, and stable dual-power vacuum circuit breaker. The technical solution includes: a frame, solid-sealed poles arranged in a three-phase distribution at the front end of the frame, a main circuit breaker operating mechanism and a standby circuit breaker operating mechanism located at the rear end of the frame. Each phase of the solid-sealed pole includes a first power circuit and a second power circuit. The main circuit breaker operating mechanism and the standby circuit breaker operating mechanism control the on / off state of the first power circuit and the second power circuit respectively via a linkage mechanism on the main shaft. The linkage mechanism includes two crank arms rotatably mounted on a fixed base via a first connecting shaft, and a second connecting shaft... The system includes two first linkage rods rotatably mounted on the lower ends of the two crank arms, a lower connecting seat rotatably mounted on the lower ends of the two first linkage rods via a third connecting shaft, and an upper connecting seat rotatably mounted on the upper ends of the two crank arms. The upper connecting seat is connected to the moving iron core of the fixed pole post, and the lower connecting seat is connected to the main shaft. The crank arm includes an upper crank arm and a lower crank arm. The upper crank arm and the lower crank arm are set at an obtuse angle, and the lower crank arm and the first linkage rod, as well as the first linkage rod and the lower connecting seat, are set at acute angles.

Description

TECHNICAL FIELD

[0001] The present application relates to a dual power vacuum circuit breaker. BACKGROUND

[0002] The dual power vacuum circuit breaker is mainly applied to the dual power supply system of alternating current 50 Hz, rated voltage 12 KV and rated current 630 A. When one power supply is powered off or under-voltage, the 12 KV high-voltage dual power automatic switching is switched on, and the switch is normally powered to reliably ensure the continuity of power supply. The structure of the traditional dual power vacuum circuit breaker is shown in the Chinese invention patents with the application publication number "CN111354596 A" and the name "dual power switch vacuum circuit breaker" or the application publication number "CN111785566 A" and the name "dual power vacuum circuit breaker". It includes a rack, a fixed pole column arranged in a three-phase distribution manner at the front end of the rack, a main circuit breaker operating mechanism and a standby circuit breaker operating mechanism arranged at the rear end of the rack. Each phase fixed pole column includes a first power circuit and a second power circuit. The main circuit breaker operating mechanism and the standby circuit breaker operating mechanism control the on / off of the first power circuit and the second power circuit through the linkage mechanism on the main shaft, respectively. An interlocking mechanism is arranged between the main circuit breaker operating mechanism and the standby circuit breaker operating mechanism. When the main circuit breaker operating mechanism is in the closed state, the standby circuit breaker operating mechanism is locked by the interlocking mechanism, so that it cannot be closed. Conversely, when the standby circuit breaker operating mechanism is in the closed state, the main circuit breaker operating mechanism is locked by another interlocking mechanism, so that it cannot be closed. The front patent has the following shortcomings: as shown in the Figures 5-9 , the connecting rod of the interlocking mechanism is longitudinally arranged in the rack, the length of the connecting rod is very long, which leads to the decrease of the sensitivity and stability of the interlocking mechanism, and a large installation space is required. The latter patent has the following shortcomings: as shown in the Figure 3 , the connecting rod of the interlocking mechanism is transversely arranged at both ends of the rack. Although the length of the connecting rod is shortened, the fixed pole column needs to be installed longitudinally, which leads to the increase of the product height, and a long locking connecting rod is required to cooperate with it. In addition, the traditional interlocking mechanism adopts a common snap spring to connect the shaft, which has poor stability and is easy to fall off during the opening and closing process. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a dual power vacuum circuit breaker with small size, high sensitivity and good stability.

[0004] The technical scheme adopted by the present application comprises the following steps: a rack, solid-enclosed poles arranged in a three-phase distribution mode at the front end of the rack, a main circuit breaker operating mechanism and a standby circuit breaker operating mechanism arranged at the rear end of the rack, each phase of the solid-enclosed poles comprising a first power supply loop and a second power supply loop, the main circuit breaker operating mechanism and the standby circuit breaker operating mechanism controlling the on / off of the first power supply loop and the second power supply loop through a linkage mechanism on a main shaft, characterized in that the linkage mechanism comprises two crank arms rotatably arranged on a fixed seat through a first connecting shaft, two first linkage rods rotatably arranged at the lower end portions of the two crank arms through a second connecting shaft, a lower connecting seat rotatably arranged at the lower end portions of the two first linkage rods through a third connecting shaft, and an upper connecting seat rotatably arranged at the upper end portions of the two crank arms, the upper connecting seat being connected with a moving iron core of the solid-enclosed pole, the lower connecting seat being connected with the main shaft, the crank arms comprising an upper crank arm and a lower crank arm, the upper crank arm and the lower crank arm being arranged at an obtuse angle, and the lower crank arm and the first linkage rod and the first linkage rod and the lower connecting seat being arranged at acute angles.

[0005] The dual-power vacuum circuit breaker is characterized in that the included angle between the upper crank arm and the lower crank arm is 90°<α<120°, the included angle between the lower crank arm and the first linkage rod is 60°<β<80° in the reset state, and the included angle between the first linkage rod and the lower connecting seat is 60°<γ<80°.

[0006] The dual-power vacuum circuit breaker is characterized in that the two ends of the first connecting shaft, the second connecting shaft, the third connecting shaft, the upper connecting seat and the lower connecting seat are each provided with an integral snap spring, the integral snap spring comprises a clamping plate provided with a "U"-shaped groove, an anti-backup plate is integrally stamped and formed at the upper end of the clamping plate, an anti-backup portion close to the clamping plate is arranged at the lower end of the anti-backup plate, an inclined guide surface is arranged at the lower end of the anti-backup portion, and a positioning plate abutting against the guide surface is formed at the lower end of the clamping plate by bending.

[0007] The dual-power vacuum circuit breaker is characterized in that the anti-backup plate is integrally stamped and formed with a positioning spring piece.

[0008] The dual-power vacuum circuit breaker is characterized in that an interlocking mechanism is arranged between the main circuit breaker operating mechanism and the standby circuit breaker operating mechanism, the interlocking mechanism comprising a trigger head fixed on the main shaft, a first interlocking rod slidably arranged in the rack, a first reset spring driving the first interlocking rod to reset upwardly, a second linkage rod arranged below the first interlocking rod, and a third linkage rod shaft-connected below the second linkage rod.

[0009] The upper end of the second linkage lever is connected with a rotary proximity switch trigger plate, a proximity switch is arranged beside the rotary proximity switch trigger plate, the rotary proximity switch trigger plate is connected with a rotary push plate at the connection of the second linkage lever and the third linkage lever, the lower end of the third linkage lever is connected with a rotary limiting frame, a reset torsion spring is arranged on the rotary limiting frame, a limiting rod is arranged on the rotary limiting frame, and a limiting column matched with the limiting rod is arranged on the main gear of the main circuit breaker operating mechanism and the standby circuit breaker operating mechanism.

[0010] One side of the rotary push plate is provided with a manual unlocking switch, and the lower end of the first interlocking lever is provided with a baffle.

[0011] The double power supply vacuum circuit breaker is characterized in that the first interlocking lever is installed on the partition plate of the rack through an L-shaped support, the top end of the first interlocking lever is integrally stamped and formed with a pressure receiving plate, the bottom is integrally stamped with the baffle, and two sliding grooves are arranged on the side wall and can be slidably installed on the sliding shaft of the L-shaped support through the sliding grooves.

[0012] The double power supply vacuum circuit breaker is characterized in that shaft sleeves are arranged on the first connecting shaft and the second connecting shaft.

[0013] The double power supply vacuum circuit breaker is characterized in that the manual unlocking switch comprises a square shell integrally stamped and formed, a push rod arranged in the square shell, a second reset spring sleeved on the front end of the push rod, and a button arranged on the push rod, and the button is connected with the panel of the rack through a shaft.

[0014] The double power supply vacuum circuit breaker is characterized in that a positioning column is arranged in front of the rotary push plate.

[0015] The double power supply vacuum circuit breaker has the following advantages: 1. The linkage mechanism is small in size and can be directly arranged on the main shaft and the fixed pole of the main circuit breaker operating mechanism, and is sensitive in response and stable in structure; 2. The interlocking mechanism is small in size and convenient to operate, and can be directly arranged between the two main shafts without occupying space. BRIEF DESCRIPTION OF DRAWINGS

[0016] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0017] Figure 1 is a structural schematic view of the double power supply vacuum circuit breaker of the application;

[0018] Figure 2 is a sectional view of the double power supply vacuum circuit breaker of the application;

[0019] Figure 3This is a schematic diagram of the linkage mechanism of the present invention;

[0020] Figure 4 This is a side view of the linkage mechanism of the present invention;

[0021] Figure 5 , Figure 6 These are schematic diagrams of the integrated snap ring of the present invention at different angles;

[0022] Figure 7 This is a schematic diagram of the crank arm of the present invention;

[0023] Figure 8 This is a schematic diagram of the structure of the first interlocking rod of the present invention;

[0024] Figure 9 This is a schematic diagram of the manual unlocking switch of the present invention. Detailed Implementation

[0025] like Figures 1 to 9 As shown, the dual-power vacuum circuit breaker of the present invention includes a frame 1, solid-sealed poles 2 arranged in a three-phase configuration at the front end of the frame 1, a main circuit breaker operating mechanism 3 and a standby circuit breaker operating mechanism 4 located at the rear end of the frame 1. Each solid-sealed pole 2 includes an insulating shell and a vacuum interrupter chamber disposed within the insulating shell, with a moving iron core 17 mounted on the vacuum interrupter chamber. Each phase of the solid-sealed pole 2 includes a first power circuit 5 and a second power circuit 6, with a power output terminal 53 located between the first power circuit 5 and the second power circuit 6. The main circuit breaker operating mechanism 3 and the standby circuit breaker operating mechanism 4 control the on / off states of the first power circuit 5 and the second power circuit 6 respectively via a linkage mechanism 8 on the main shaft 7. The linkage mechanism 8 includes two crank arms 11 rotatably mounted on a fixed base 10 via a first connecting shaft 9, two first linkage rods 13 rotatably mounted at the lower ends of the two crank arms 11 via a second connecting shaft 12, a lower connecting seat 15 rotatably mounted at the lower ends of the two first linkage rods 13 via a third connecting shaft 14, and an upper connecting seat 16 rotatably mounted at the upper ends of the two crank arms 11. The fixed base 10 is welded inside the frame 1. The upper connecting seat 16 is bolted to the moving iron core 17 on the fixed end post 2, and the lower connecting seat 15 is connected to the main shaft 7. Each crank arm 11 includes an upper crank arm 111 and a lower crank arm 112, which are set at an obtuse angle. The lower crank arm 112 and the first linkage rod 13, as well as the first linkage rod 13 and the lower connecting seat 15, are set at acute angles. When the main circuit breaker operating mechanism 3 is closed, its main shaft 7 rotates in the direction indicated by the arrow, and drives the linkage of the lower connecting seat 15, the first linkage rod 13, and the crank arm 11, causing the crank arm 11 to rotate in the opposite direction, thereby pushing the moving iron core 17 of the solid-sealed pole 2 forward and closing.

[0026] Preferably, the included angle between the upper arm 111 and the lower arm 112 is 90°<α<120°, and most ideally 120°, and in the reset state, the included angle between the lower arm 112 and the first linkage rod 13 is 60°<β<80°, and most ideally 70°, and the included angle between the first linkage rod 13 and the lower connecting seat 15 is 60°<γ<80°, and most ideally 75°. With the above angle settings, the sensitivity and stability of the linkage mechanism 8 are optimal.

[0027] Preferably, the first connecting shaft 9, the second connecting shaft 12, the third connecting shaft 14, the upper connecting seat 16 and the lower connecting seat 15 are each provided with an integral snap spring 18, the integral snap spring 18 comprising a clamping plate 20 provided with a "U"-shaped slot 19, the clamping plate 20 being integrally formed with a retreat-stop plate 21 at the upper end, the retreat-stop plate 21 being provided with a shaft hole 22 at the middle portion, the retreat-stop plate 21 being provided with a retreat-stop portion 23 close to the clamping plate 20 at the lower end, the retreat-stop portion 23 being provided with an inclined guide surface 24 at the lower end, and the clamping plate 20 being formed with a positioning plate 25 abutting against the guide surface 24 by bending at the lower end. When assembled, the "U"-shaped slot 19 of the clamping plate 20 is clamped into the clamping slot of the connecting shaft end, and the connecting shaft end extending into the shaft hole 22 of the retreat-stop plate 21 is clamped to stop the retreat of the clamping plate 20 and prevent it from falling off.

[0028] Preferably, the retreat-stop plate 21 is integrally formed with a positioning spring 26, and when the integral snap spring 18 is assembled, the positioning spring 26 presses against the outer side surface of the connecting shaft end, so that the integral snap spring 18 can be more stably retained on the connecting shaft.

[0029] Preferably, the interlocking mechanism between the main circuit breaker operating mechanism 3 and the backup circuit breaker operating mechanism 4 comprises a trigger head 27 fixed on the main shaft 7, a first interlocking rod 28 slidably arranged in the rack 1, a first reset spring 29 for driving the first interlocking rod 28 to reset upward, a second linkage rod 30 arranged below the first interlocking rod 28, and a third linkage rod 31 shaft-connected below the second linkage rod 30. The upper end of the second linkage rod 30 is shaft-connected with a rotary proximity switch trigger plate 32, and the middle part of the rotary proximity switch trigger plate 32 is rotatably mounted on the rack 1. A proximity switch 33 is arranged beside the rotary proximity switch trigger plate 32. The connection part of the second linkage rod 30 and the third linkage rod 31 is shaft-connected with a rotary push plate 34. The lower end of the third linkage rod 31 is shaft-connected with a rotary limit frame 35, and the rotary limit frame 35 is provided with a reset torsional spring 36 and a limit rod 37. The main gear 38 of the main circuit breaker operating mechanism 3 and the backup circuit breaker operating mechanism 4 is provided with a limit column 39 matched with the limit rod 37. In the locked state, the limit rod 37 of the rotary limit frame 35 is locked by the limit column 39 on the main gear 38 of the backup circuit breaker operating mechanism 4 under the action of the reset torsional spring 36. One side of the rotary push plate 34 is provided with a manual unlocking switch 40, and the lower end of the first interlocking rod 28 is provided with a baffle 41. When the main circuit breaker operating mechanism 3 is in the closed state, the first interlocking rod 28 is moved downward by the pressure of the trigger head 27, so that the baffle 41 at the lower end of the first interlocking rod 28 is blocked behind the rotary push plate 34, thereby preventing the manual unlocking switch 40 from being operated, and achieving the locking effect. Conversely, when the main circuit breaker operating mechanism 3 is in the open state, the first interlocking rod 28 is automatically reset by the first reset spring 29, so that the manual unlocking switch 40 can be operated to achieve the unlocking effect.

[0030] Preferably, the first interlocking rod 28 is installed on the partition plate 43 of the rack 1 through an "L"-shaped support 42. The top end of the first interlocking rod 28 is integrally formed with a pressure plate 44, and the bottom of the first interlocking rod 28 is integrally formed with the baffle 41. The side wall of the first interlocking rod 28 is provided with two sliding grooves 45, which are slidably installed on the sliding shaft 46 of the "L"-shaped support 42 through the sliding grooves 45. The lower end of the first reset spring 29 is hung on the first interlocking rod 28, and the upper end is hung on the "L"-shaped support 42. After assembly, the first interlocking rod 28, the "L"-shaped support 42, and the first reset spring 29 form an assembly, which has the advantages of small structure and convenient installation.

[0031] Preferably, the first connecting shaft 9 and the second connecting shaft 12 are provided with a shaft sleeve 47 for supporting the inner wall of the toggle arm 11 to improve the stability and strength of the toggle arm 11.

[0032] Preferably, the manual unlocking switch 40 comprises a square-shaped housing 48 formed by one-piece stamping, a push rod 49 arranged in the square-shaped housing 48, a second return spring 50 sleeved on the front end of the push rod 49, and a button 51 arranged on the push rod 49 and axially connected to the panel of the rack 1. The front end of the square-shaped housing 48 is further provided with a guide sleeve 54, the front end of the push rod 49 extends out of the square-shaped housing 48 through the guide sleeve 54 and is fixed by a pin. The manual unlocking switch 40 has the advantages of simplicity, reliability, durability and easy installation.

[0033] Preferably, the front of the rotary push plate 34 is provided with a positioning column 52 for positioning after the rotary push plate 34 is rotated in place to prevent the manual unlocking switch 40 from being pressed too hard and causing the rotary push plate 34 to break.

[0034] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A dual power vacuum circuit breaker comprising a frame (1), fixed sealed poles (2) arranged in a three-phase distribution manner at the front end of the frame (1), a main circuit breaker operating mechanism (3) and a standby circuit breaker operating mechanism (4) arranged at the rear end of the frame (1), the fixed sealed pole (2) of each phase comprising a first power circuit (5) and a second power circuit (6), the main circuit breaker operating mechanism (3) and the standby circuit breaker operating mechanism (4) respectively controlling the on / off of the first power circuit (5) and the second power circuit (6) through a linkage mechanism (8) on a main shaft (7), characterized in that: The linkage mechanism (8) comprises two crank arms (11) rotatably arranged on the fixed seat (10) through a first connecting shaft (9), two first linkage rods (13) rotatably arranged at the lower ends of the two crank arms (11) through a second connecting shaft (12), a lower connecting seat (15) rotatably arranged at the lower ends of the two first linkage rods (13) through a third connecting shaft (14), and an upper connecting seat (16) rotatably arranged at the upper ends of the two crank arms (11), the upper connecting seat (16) being connected with a moving iron core (17) of the fixed sealing pole (2), the lower connecting seat (15) being connected with the main shaft (7), the crank arms (11) comprising an upper crank arm (111) and a lower crank arm (112), the upper crank arm (111) and the lower crank arm (112) being arranged at an obtuse angle, and the lower crank arm (112) and the first linkage rod (13) being arranged at an acute angle. An interlocking mechanism is arranged between the main circuit breaker operating mechanism (3) and the standby circuit breaker operating mechanism (4), the interlocking mechanism comprising a trigger head (27) fixed on the main shaft (7), a first interlocking rod (28) slidably arranged in the rack (1), a first reset spring (29) driving the first interlocking rod (28) to reset upward, a second linkage rod (30) arranged below the first interlocking rod (28), and a third linkage rod (31) shaft-connected below the second linkage rod (30). A rotary proximity switch trigger plate (32) is shaft-connected to the upper end of the second linkage rod (30), a proximity switch (33) is arranged beside the rotary proximity switch trigger plate (32), a rotary push plate (34) is shaft-connected to the connection between the second linkage rod (30) and the third linkage rod (31), a rotary limiting frame (35) is shaft-connected to the lower end of the third linkage rod (31), a reset torsional spring (36) is arranged on the rotary limiting frame (35), a limiting rod (37) is arranged on the rotary limiting frame (35), and a limiting column (39) matched with the limiting rod (37) is arranged on the main gear (38) of the main circuit breaker operating mechanism (3) and the standby circuit breaker operating mechanism (4). A manual unlocking switch (40) is arranged on one side of the rotary push plate (34), and a baffle (41) is arranged at the lower end of the first interlocking rod (28), when the main circuit breaker operating mechanism (3) is in a closed state, the first interlocking rod (28) moves downward, and the baffle (41) blocks behind the rotary push plate (34).

2. The dual power vacuum circuit breaker of claim 1, wherein: The included angle between the upper crank arm (111) and the lower crank arm (112) is 90°<α<120°, and in the reset state, the included angle between the lower crank arm (112) and the first linkage rod (13) is 60°<β<80°, and the included angle between the first linkage rod (13) and the lower connecting seat (15) is 60°<γ<80°.

3. The dual power vacuum circuit breaker of claim 1, wherein: Both ends of the first connecting shaft (9), the second connecting shaft (12), the third connecting shaft (14), the upper connecting seat (16) and the lower connecting seat (15) are provided with an integral snap spring (18), the integral snap spring (18) comprises a clamping plate (20) provided with a "U"-shaped groove (19), the clamping plate (20) is integrally punched and formed with a retreat stop plate (21) at the upper end, the retreat stop plate (21) is provided with an axle hole (22) at the middle part, a retreat stop portion (23) close to the clamping plate (20) at the lower end, an inclined guide surface (24) at the lower end of the retreat stop portion (23), and a positioning plate (25) formed by bending at the lower end of the clamping plate (20) and abutting against the guide surface (24).

4. The dual power vacuum circuit breaker of claim 3, wherein: The retreat stop plate (21) is integrally punched and formed with a positioning spring plate (26).

5. The dual power vacuum circuit breaker of claim 1, wherein: The first interlocking rod (28) is installed on the partition plate (43) of the rack (1) through an "L"-shaped support (42), the first interlocking rod (28) is integrally punched and formed with a pressure receiving plate (44) at the top end and the baffle (41) at the bottom, and two slide grooves (45) are arranged on the side wall and slidably installed on the sliding shaft (46) of the "L"-shaped support (42) through the slide grooves (45).

6. The dual power vacuum circuit breaker of claim 1, wherein: The first connecting shaft (9) and the second connecting shaft (12) are provided with shaft sleeves (47).

7. The dual power vacuum circuit breaker of claim 1, wherein: The manual unlocking switch (40) comprises a square shell (48) integrally punched and formed, a push rod (49) arranged in the square shell (48), a second return spring (50) sleeved on the front end of the push rod (49), and a button (51) arranged on the push rod (49), the button (51) is pivotally connected to the panel of the rack (1).

8. The dual power vacuum circuit breaker of claim 1, wherein: The rotary push plate (34) is provided with a positioning column (52) in front.

Images