A spring operating mechanism with two-stage opening buffering

Abstract

The present invention discloses a spring operating mechanism adopting two-stage opening buffering, belonging to the technical field of circuit breakers. It includes an output crank arm, a first connecting rod, a two-stage opening buffer, a first buffer module, a second connecting rod, a first-stage opening buffer, a first-stage buffer cam, an outer crank arm on the circuit breaker side, a third connecting rod, a second buffer module, and a vacuum interrupter; the output crank arm and the first connecting rod are jointly rotatably sleeved with an output shaft, and a transmission component is further arranged on the output shaft for driving the rotation of the output shaft. The present invention can improve the arc extinguishing ability of the vacuum interrupter and reduce the design difficulty of the vacuum interrupter. In addition, it is provided with a first-stage opening buffer and a two-stage opening buffer at the same time, which can accurately control the speed curve requirements of the mechanism at different opening positions; it can realize the input of the first-stage opening buffer and the two-stage opening buffer during the opening process, and the cam profile of the first-stage buffer cam can accurately control the movement displacement of the vacuum interrupter when the first-stage opening buffer is input and cut out.

Description

Technical Field

[0001] The present invention relates to a spring operating mechanism with secondary opening buffering, belonging to the technical field of circuit breakers. Background Art

[0002] High-voltage switch circuit breakers are developing towards miniaturization and large capacity. With the in-depth research on vacuum interrupters, the requirements for accurately controlling the stroke curve of the circuit breaker mechanism in different stages to meet different speed requirements are getting higher and higher. For example, with the in-depth research on vacuum interrupters, the movement speed curve of the vacuum interrupter is required as Figure 1 shown: It is divided into four stages in total, the first stage is the high-speed stage, the second stage is the low-speed stage, the third stage is the high-speed stage, and the fourth stage is the deceleration stage.

[0003] Currently, the spring operating mechanisms developed by existing manufacturers for circuit breakers all have only primary opening buffering, and cannot achieve secondary opening buffering of the mechanism, making the buffering curve more conducive to the opening performance requirements of the vacuum interrupter. In addition, the different speed requirements of the buffering curve in different stages cannot be achieved, resulting in the inability to make the opening ability of the vacuum interrupter reach the optimal state; furthermore, gradually decreasing the speed of the spring operating mechanism in different stages cannot meet the function of the spring operating mechanism to descend and then rise.

[0004] To meet the above requirements, it is necessary to develop a spring operating mechanism that meets secondary buffering. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to provide a spring operating mechanism with secondary opening buffering, aiming to achieve the four-stage purpose of high-speed - deceleration - high-speed - descent of the opening speed of the spring operating mechanism.

[0006] The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0007] A spring operating mechanism with secondary opening buffering includes an output crank arm, a first connecting rod, a secondary opening buffer, a first buffer module, a second connecting rod, a primary opening buffer, a primary buffer cam, an outer crank arm on the circuit breaker side, a third connecting rod, a second buffer module, and a vacuum interrupter;

[0008] The output crank arm and the first connecting rod are jointly rotatably sleeved on an output shaft, and a transmission component is further provided on the output shaft for driving the rotation of the output shaft. One end of the first buffer module is installed on the output end of the secondary opening buffer, and the other end of the first buffer module is connected to one end of the first connecting rod;

[0009] One end of the second connecting rod is connected to the bottom of the output crank arm. The first-stage buffer cam and the outer crank arm on the circuit breaker side are jointly rotatably sleeved on the rotating shaft. The other end of the second connecting rod is connected to one end of the outer crank arm on the circuit breaker side. The first-stage opening buffer is arranged below the second connecting rod, and the output end of the first-stage opening buffer corresponds to the first-stage buffer cam.

[0010] The bottom of the third connecting rod is installed on the outer crank arm on the circuit breaker side. The second buffer module is connected to the top of the third connecting rod, and the bottom of the vacuum interrupter is connected to the top of the second buffer module.

[0011] Preferably, one end of the output crank arm is also rotatably sleeved with a fourth connecting rod. One end of the fourth connecting rod is sleeved with two first connecting plates, and one of the first connecting plates is located at the end of the fourth connecting rod. A closing spring is connected between the two first connecting plates, and the closing spring is also sleeved on the fourth connecting rod between the two first connecting plates.

[0012] Preferably, the transmission assembly includes a horn detent, a closing detent, a closing lever, and a closing electromagnet.

[0013] The output shaft is also rotatably sleeved with a fifth connecting rod. The fifth connecting rod, the horn detent, the closing detent, and the closing lever are in contact in sequence, and the closing lever is in contact with the closing electromagnet.

[0014] Preferably, when the closing electromagnet is energized, it pushes the upper closing lever to rotate counterclockwise at this time. The closing detent also has an eccentric structure and rotates counterclockwise under the action of the closing spring pressure. When the closing detent makes room, the horn detent will rotate counterclockwise under the action of the closing spring pressure. At this time, the outer crank arm is pulled by the closing spring tension to rotate counterclockwise.

[0015] Preferably, the first buffer includes a piston and an oil cylinder. Two steps are provided on the outer side wall of the bottom of the piston. A channel is provided inside the oil cylinder. The channel includes a first channel, a second channel, and a third channel, and the first channel, the second channel, and the third channel are connected in sequence from top to bottom in the channel. The diameter of the first channel and the diameter of the third channel are both smaller than the diameter of the second channel. A first step is provided at the bottom of the first channel and the top of the second channel, and a second step is provided at the bottom of the second channel and the top of the third channel.

[0016] The piston is sleeved in the oil cylinder through two steps, and there is a gap between the piston and the channel of the oil cylinder.

[0017] Preferably, an oil drain groove is provided at the bottom of the piston to guide the unprocessed part on the piston when the piston moves in the internal channel of the oil cylinder, and prevent jamming in the channel in the oil cylinder or on the first step and the second step in the oil cylinder.

[0018] Preferably, the cross-sectional shape of the oil drain groove is a pointed shape with a wider upper part and a narrower lower part.

[0019] Preferably, a fork is installed on the top of the piston. The fork is provided with a kidney-shaped hole, and the axial direction of the kidney-shaped hole is consistent with the movement direction of the piston. One end of the piston is connected to the fork by a thread. A buffer mating pin is connected to the first connecting rod, and the buffer mating pin is slidably sleeved in the kidney-shaped hole.

[0020] The purpose of adopting the above buffer is that different resistance requirements at different strokes of the circuit breaker can be achieved through a single buffer, and the change of the buffer resistance is realized through the first step and the second step on the oil cylinder; by controlling the height direction dimensions of the first step and the second step on the oil cylinder, different resistance magnitudes are required corresponding to different strokes of the circuit breaker, and different speeds of the circuit breaker at different strokes are realized.

[0021] Specifically:

[0022] When the lower edge of the step on the piston moves to the upper edge of the first step on the oil cylinder, the piston moves downward and starts to compress the hydraulic oil in the lower oil cylinder. The hydraulic oil moves upward through the gap between the piston and the oil cylinder, and the resistance is formed by using the gap to decelerate the circuit breaker. By adjusting the size of the oil drain groove gap, different resistances can meet different requirements for decelerating the circuit breaker;

[0023] When the upper edge of the step on the piston moves to the lower edge of the first step on the oil cylinder, since the gap of the oil cylinder suddenly becomes larger, the resistance of the hydraulic oil moving upward disappears at this time. At this time, the buffer has no resistance to the circuit breaker, and the circuit breaker starts to accelerate for the second time under the action of the spring tension;

[0024] When the lower edge of the step on the piston moves to the upper edge of the second step on the oil cylinder, the buffer starts to form resistance by using the gap again to decelerate the circuit breaker.

[0025] Preferably, the second buffer module includes two second connecting plates and a buffer spring. Both of the second connecting plates are sleeved on one end of the third connecting rod, and one of the second connecting plates is located at the end of the third connecting rod. The buffer spring is connected between the two second connecting plates, and the buffer spring is also sleeved on the third connecting rod located between the two second connecting plates.

[0026] It should be noted that the diameter of the first channel is equal to or different from the diameter of the third channel.

[0027] As a preferred example, the height of the first channel is equal to or different from the height of the third channel.

[0028] As a preferred example, the direction of the first step is the same as or different from the direction of the second step.

[0029] It should be noted that the directions of the first step and the second step are judged based on whether they are on the same side wall of the channel.

[0030] The beneficial effects of the present invention are as follows: The present invention can improve the arc extinguishing ability of the vacuum interrupter and reduce the design difficulty of the vacuum interrupter; in addition, the spring operating mechanism with a first-stage opening buffer and a second-stage opening buffer can accurately control the speed curve requirements of the mechanism at different opening positions; it can realize the function that the first-stage opening buffer and the second-stage opening buffer are engaged during the opening process, and the buffers are not engaged during the closing process (the first-stage opening is rotated counterclockwise); the cam profile of the first-stage buffer cam can accurately control the movement displacement of the vacuum interrupter when the first-stage opening buffer is engaged and disengaged; the displacement of the vacuum interrupter when the second-stage opening buffer is engaged can be accurately controlled by the size of the kidney-shaped hole on the second-stage opening buffer. Description of the Drawings

[0031] Figure 1 It is the movement speed curve diagram of the vacuum interrupter in the present invention;

[0032] Figure 2 It is the structural schematic diagram of the present invention;

[0033] Figure 3 is Figure 2 the structural schematic diagram of part A in

[0034] Figure 4 It is the structural schematic diagram of the second-stage buffer in the present invention;

[0035] Figure 5 is Figure 4 the structural schematic diagram in the B-B direction of

[0036] Figure 6 is Figure 5 the structural schematic diagram in the C-C direction of

[0037] Figure 7 It is the structural schematic diagram of the piston in the present invention;

[0038] In the figure: output crank arm 1, first connecting rod 2, second-stage opening buffer 3, second connecting rod 4, first-stage buffer cam 5, outer crank arm on the circuit breaker side 6, third connecting rod 7, vacuum interrupter 8, output shaft 9, first-stage opening buffer 10, fourth connecting rod 11, opening spring 12, horn detent 13, opening detent 14, opening lever 15, opening electromagnet 16, fifth connecting rod 17, buffer spring 18, cross fork 19, piston 20, kidney-shaped hole 21, buffer fitting pin 22, oil cylinder 23, oil drain groove 24. Detailed Embodiments

[0039] In order to facilitate the understanding of the technical means, creative features, achieved objectives and effects of the present invention, the present invention will be further described below with reference to specific illustrations.

[0040] As Figures 1-7 shown, a spring operating mechanism adopting two-stage opening buffering includes an output crank arm 1, a first connecting rod 2, a two-stage opening buffer 3, a first buffer module, a second connecting rod 4, a first-stage opening buffer 10, a first-stage buffer cam 5, an outer crank arm 6 on the circuit breaker side, a third connecting rod 7, a second buffer module and a vacuum interrupter 8;

[0041] The output crank arm 1 and the first connecting rod 2 are jointly rotatably sleeved on an output shaft 9. A transmission component is also provided on the output shaft 9 for driving the rotation of the output shaft 9. One end of the first buffer module is installed on the output end of the two-stage opening buffer 3, and the other end of the first buffer module is connected to one end of the first connecting rod 2;

[0042] One end of the second connecting rod 4 is connected to the bottom of the output crank arm 1. The first-stage buffer cam 5 and the outer crank arm 6 on the circuit breaker side are jointly rotatably sleeved on a rotating shaft. The other end of the second connecting rod 4 is connected to one end of the outer crank arm 6 on the circuit breaker side. The first-stage opening buffer 10 is arranged below the second connecting rod 4, and the output end of the first-stage opening buffer 10 corresponds to the first-stage buffer cam 5;

[0043] The bottom of the third connecting rod 7 is installed on the outer crank arm 6 on the circuit breaker side. The second buffer module is connected to the top of the third connecting rod 7, and the bottom of the vacuum interrupter 8 is connected to the top of the second buffer module.

[0044] One end of the output crank arm 1 is also rotatably sleeved with a fourth connecting rod 11. One end of the fourth connecting rod 11 is sleeved with two first connecting plates, and one of the first connecting plates is located at the end of the fourth connecting rod 11. A closing spring 12 is connected between the two first connecting plates, and the closing spring 12 is also sleeved on the fourth connecting rod 11 between the two first connecting plates.

[0045] The transmission component includes a horn latch 13, a closing latch 14, a closing lever 15, and a closing electromagnet 16;

[0046] A fifth connecting rod 17 is also rotatably sleeved on the output shaft 9. The fifth connecting rod 17, the horn latch 13, the closing latch 14, and the closing lever 15 are in contact in sequence, and the closing lever 15 is in contact with the closing electromagnet 16.

[0047] When the closing electromagnet 16 is energized, it pushes the upper closing lever 15 to rotate counterclockwise at this time. The closing latch 14 also has an eccentric structure and rotates counterclockwise under the pressure of the closing spring 12. When the closing latch 14 gives way, the horn latch 13 will rotate counterclockwise under the pressure of the closing spring 12. At this time, the outer crank arm 1 is pulled by the pulling force of the closing spring 12 and rotates counterclockwise.

[0048] The first buffer includes a piston 20 and an oil cylinder 23. Two steps are provided on the outer sidewall of the bottom of the piston 20. A channel is provided inside the oil cylinder 23. The channel includes a first channel, a second channel, and a third channel, and the first channel, the second channel, and the third channel are connected in sequence from top to bottom in the channel. The diameter of the first channel and the diameter of the third channel are both smaller than the diameter of the second channel. A first step is provided at the bottom of the first channel and the top of the second channel, and a second step is provided at the bottom of the second channel and the top of the third channel;

[0049] The piston 20 is sleeved in the oil cylinder 23 through two steps, and there is a gap between the piston 20 and the channel of the oil cylinder 23.

[0050] An oil drain groove 24 is provided at the bottom of the piston 20, which plays a guiding role for the unprocessed part on the piston 20 when the piston 20 moves in the internal channel of the oil cylinder 23, and avoids jamming in the channel in the oil cylinder 23 or on the first step and the second step in the oil cylinder 23.

[0051] The cross-sectional shape of the oil drain groove 24 is a pointed shape with a wider top and a narrower bottom.

[0052] It should be noted that the diameter of the first channel is equal to or different from the diameter of the third channel.

[0053] The height of the first channel is equal to or different from the height of the third channel.

[0054] The direction of the first step is the same as or different from the direction of the second step.

[0055] It should be noted that the direction of the first step and the direction of the second step are judged based on whether the channels are on the same sidewall.

[0056] A clamp fork 19 is installed on the top of the piston 20. A kidney-shaped hole 21 is provided on the clamp fork 19, and its axial direction is consistent with the movement direction of the piston 20. One end of the piston 20 is connected to the clamp fork 19 by a thread. A buffer fitting pin 22 is connected to the first connecting rod 2, and the buffer fitting pin 22 is slidably sleeved in the kidney-shaped hole 21.

[0057] The second buffer module includes two second connecting plates and a buffer spring 18. Both second connecting plates are sleeved on one end of the third connecting rod 7, and one of the second connecting plates is located at the end of the third connecting rod 7. The buffer spring 18 is connected between the two second connecting plates, and the buffer spring 18 is also sleeved on the third connecting rod 7 located between the two second connecting plates.

[0058] It should be noted that the internal structure of the primary opening buffer 10 is the same as the internal structure of the secondary opening buffer 3.

[0059] It should also be noted that the first link 2 is sleeved on the output shaft 9 through a bearing. The purpose is that with the assistance of the bearing, the first link 2 can rotate better on the output shaft 9.

[0060] The device mainly has four stages:

[0061] In the first stage, when the circuit breaker opens, under the action of the opening spring 12, the output crank arm 1 is pulled by the pulling force of the opening spring 12 and the output shaft 9 and rotates counterclockwise. Then, under the connection of the second link 4 and with the assistance of the rotating shaft, it drives the outer crank arm 6 on the circuit breaker side to rotate clockwise on the rotating shaft. At this time, with the assistance of the third link 7 and the buffer spring 18, the vacuum interrupter 8 is pulled to perform the opening operation. This stage is the high-speed stage;

[0062] The first-stage buffer cam 5 rotates clockwise. Through the cam profile of the first-stage buffer cam 5, the displacement of the vacuum interrupter 8 corresponding to the input and cut-off of the first-stage opening buffer 10 can be accurately controlled. When the vacuum interrupter moves to the second stage (low-speed stage) (as Figure 1 shown), the first-stage buffer cam 5 compresses the first-stage opening buffer 10, and the first-stage opening buffer 10 starts to play a buffering role. At this time, the movement speed of the vacuum interrupter 8 drops to the required speed range.

[0063] When the vacuum interrupter 8 moves to the third stage, the first-stage buffer cam 5 moves to the part with an equal curvature radius. At this time, the first-stage buffer cam 5 no longer compresses the first-stage opening buffer 10, and the first-stage opening buffer 10 no longer plays a buffering role. Under the pulling force of the opening spring 22, the movement speed of the vacuum interrupter 8 starts to accelerate to the required speed range;

[0064] When the vacuum interrupter 8 moves to the fourth stage, the second-stage opening buffer 3 starts to be engaged. At this time, the transmission system speed of the vacuum interrupter 8 is reduced to 0 m / s, ensuring that the entire transmission component stops slowly and reducing the impact on the entire transmission component caused by rapid stopping;

[0065] When the device performs the closing operation, the first-stage buffer cam 5 rotates counterclockwise. The piston 20 on the first-stage opening buffer 10 is reset under the action of the return spring on the first-stage opening buffer 10, preparing for buffering during the next opening operation.

[0066] In addition, it should also be noted that three, four or more opening buffers can be added to achieve different opening curves in different stages of the spring mechanism.

[0067] The working principle of this device is as follows:

[0068] Following the above "under the pulling force of the opening spring 12 and the action of the output shaft 9, the output crank arm 1 pulls and rotates counterclockwise", and under the connection of the second connecting rod 4 and with the assistance of the rotating shaft, it drives the outer crank arm 6 on the circuit breaker side to rotate clockwise on the rotating shaft. At this time, with the assistance of the third connecting rod 7 and the buffer spring 18, it pulls the vacuum interrupter 8 to perform the opening operation;

[0069] In the initial stage, there is a gap between the first-stage buffer cam 5 and the roller on the first-stage opening buffer 10 (it should be noted that a roller matching the first-stage buffer cam 5 is installed on the first-stage opening buffer 10), and the first-stage opening buffer 10 will not be compressed, so there is no resistance. When it comes to the stage where the vacuum interrupter 8 needs to decelerate during opening, at this time, the first-stage buffer cam 5 and the roller on the first-stage opening buffer 10 come into contact, compressing the piston 20 on the first-stage opening buffer to move, and the resistance of the first-stage opening buffer 10 plays a role in decelerating.

[0070] When the vacuum interrupter 8 moves to the stage where deceleration is not required, the first-stage buffer cam 5 presses the roller on the first-stage opening buffer 10, and it just moves to the part with an equal curvature radius. At this time, the first-stage buffer cam 5 rotates, but it will not compress the roller on the first-stage opening buffer 10, and there is no relative movement between the piston 22 and the oil cylinder at this time. Therefore, the first-stage opening buffer 10 has no resistance, and under the action of the opening spring 12, the vacuum interrupter 8 starts to accelerate.

[0071] When it accelerates to the stage where acceleration is not required, at this time, the second-stage opening buffer 3 intervenes to slowly stop the vacuum interrupter 8.

[0072] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A spring operating mechanism with secondary opening buffering, characterized in that: It includes an output crank arm, a first connecting rod, a secondary opening buffer, a first buffer module, a second connecting rod, a primary opening buffer, a primary opening cam, an outer crank arm on the breaker side, a third connecting rod, a second buffer module, and a vacuum interrupter; The output crank arm and the first connecting rod are jointly rotatably sleeved on an output shaft. A transmission component is further provided on the output shaft for driving the rotation of the output shaft. One end of the first buffer module is installed on the output end of the secondary opening buffer, and the other end of the first buffer module is connected to one end of the first connecting rod; One end of the second connecting rod is connected to the bottom of the output crank arm. The primary opening cam and the outer crank arm on the breaker side are jointly rotatably sleeved on a rotating shaft. The other end of the second connecting rod is connected to one end of the outer crank arm on the breaker side. The primary opening buffer is arranged below the second connecting rod, and the output end of the primary opening buffer corresponds to the primary opening cam; The bottom of the third connecting rod is installed on the outer crank arm on the breaker side. The second buffer module is connected to the top of the third connecting rod, and the bottom of the vacuum interrupter is connected to the top of the second buffer module; The first buffer includes a piston and an oil cylinder. Two steps are provided on the outer side wall of the bottom of the piston. A channel is provided inside the oil cylinder. The channel includes a first channel, a second channel, and a third channel, and the first channel, the second channel, and the third channel are sequentially connected from top to bottom in the channel. The diameter of the first channel and the diameter of the third channel are both smaller than the diameter of the second channel. A first step is provided at the bottom of the first channel and the top of the second channel, and a second step is provided at the bottom of the second channel and the top of the third channel; The piston is sleeved in the oil cylinder through two steps, and there is a gap between the piston and the channel of the oil cylinder; The second buffer module includes two second connecting plates and a buffer spring. Both of the second connecting plates are sleeved on one end of the third connecting rod, and one of the second connecting plates is located at the end of the third connecting rod. The buffer spring is connected between the two second connecting plates, and the buffer spring is also sleeved on the third connecting rod located between the two second connecting plates; 2. A spring operating mechanism adopting secondary opening buffering according to claim 1, characterized in that: One end of the output crank arm is further rotatably sleeved with a fourth connecting rod. One end of the fourth connecting rod is sleeved with two first connecting plates, and one of the first connecting plates is located at the end of the fourth connecting rod. A closing spring is connected between the two first connecting plates, and the closing spring is also sleeved on the fourth connecting rod located between the two first connecting plates; 3. A spring operating mechanism using two-stage opening buffering according to claim 1, characterized in that: The transmission component includes a horn latch, a tripping latch, a tripping lever, and a tripping electromagnet; A fifth connecting rod is further rotatably sleeved on the output shaft. The fifth connecting rod, the horn latch, the tripping latch, and the tripping lever are in contact in sequence, and the tripping lever is in contact with the tripping electromagnet; 4. A spring operating mechanism adopting secondary opening buffering according to claim 3, characterized in that: When the tripping electromagnet is energized, it pushes the upper tripping lever to rotate counterclockwise at this time. The tripping latch also has an eccentric structure and rotates counterclockwise under the action of the closing spring pressure. When the tripping latch makes room, the horn latch will rotate counterclockwise under the action of the closing spring pressure. At this time, the outer crank arm is pulled by the closing spring tension to rotate counterclockwise.

5. A spring operating mechanism adopting secondary opening buffering according to claim 1, characterized in that: An oil drain groove is provided at the bottom of the piston, which is used to guide the unprocessed part of the piston when the piston moves in the internal passage of the oil cylinder, so as to avoid jamming in the passage of the oil cylinder or on the first and second steps in the oil cylinder.

6. The spring operating mechanism adopting two-stage opening buffering according to claim 5, characterized in that: The cross-sectional shape of the oil drain groove is a pointed shape with a wide upper part and a narrow lower part.

7. A spring operating mechanism adopting secondary opening buffering according to claim 1, characterized in that: A clamp fork is installed on the top of the piston. A kidney-shaped hole is provided on the clamp fork, and the axis direction thereof is consistent with the piston movement direction. One end of the piston is connected to the clamp fork by a thread. A buffer fitting pin is connected to the first connecting rod, and the buffer fitting pin is slidably sleeved in the kidney-shaped hole.

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