A high-voltage circuit breaker opening buffer structure and buffer method, and a high-voltage circuit breaker

Abstract

The present invention belongs to the technical field of circuit breakers, and relates to a high-voltage circuit breaker opening buffer structure and buffer method, and a high-voltage circuit breaker. The buffer structure includes a buffer mechanism and a convex profile installed through the outside of a transmission pull rod, and the convex profile and the transmission pull rod together form a transmission assembly; the buffer mechanism is arranged on the outer ring of the transmission pull rod, and when in the closed state, the buffer mechanism is located at the end of the transmission pull rod; the convex profile includes a deceleration section and an acceleration section; the deceleration section is used to match the deceleration stage, increase the compression of the buffer mechanism, and increase the buffer resistance; the acceleration section is used to match the acceleration stage, reduce the compression of the buffer mechanism, and reduce the buffer resistance. The opening characteristic in the present invention is generated by the interaction between the buffer mechanism and the convex profile. In the opening process, the buffer mechanism is put into the transmission structure in stages to change the amount of energy absorbed by the buffer mechanism, control the opening speed, and achieve different opening speed values ​​at different stages in the opening process.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a high-voltage circuit breaker opening buffer structure and buffer method, and a high-voltage circuit breaker. Background Art

[0002] A high-voltage circuit breaker is a switching device that realizes the closing, carrying and breaking functions of normal (or abnormal) current. During the operation of the product, the opening and closing operations are required to realize the functions of breaking and closing the current. When the high-voltage circuit breaker is opened or closed under the drive of the operating mechanism, the movement characteristics of the contacts are called mechanical characteristics. The current load breaking performance of the high-voltage circuit breaker not only has requirements for the average opening speed value of the opening characteristics, but also has specific requirements for the distribution of speed values ​​at different stages in the entire opening process. Different forms of circuit breaker arc extinguishing chamber structures, different current arc extinguishing principles or arc extinguishing media also have different requirements for the opening speed at different stages (opening distance) in the opening process. Therefore, when designing the circuit breaker, it is necessary to design specific opening characteristics based on the influencing factors such as the circuit breaker arc extinguishing chamber structure, arc extinguishing principle, arc extinguishing medium characteristics and breaking current size, and then specifically design the circuit breaker operating mechanism or transmission mechanism to achieve effective breaking of normal or fault short-circuit current.

[0003] The existing technical solution adopts the method of adding a liquid buffer to the operating mechanism. The liquid buffer includes a piston, a buffer inner cylinder, a buffer outer cylinder and buffer oil. During the opening process of the circuit breaker, the buffer piston and the buffer inner cylinder move relative to each other, squeezing the buffer oil into the buffer outer cylinder through the flow holes distributed on the inner cylinder, converting the circuit breaker opening kinetic energy into heat energy, thereby achieving opening speed control and opening buffering. The damping size and buffering effect of the liquid buffer in the scheme mainly depend on the cross-sectional area and size of the flow holes on the buffer inner cylinder at different stages. In order to achieve the buffering of the circuit breaker opening speed, the cross-sectional area of ​​the effective working flow holes on the buffer inner cylinder gradually decreases during the circuit breaker opening process, so the circuit breaker opening speed gradually decreases until the circuit breaker opening operation is completed. In this process, the circuit breaker opening speed gradually decreases in stages, and cannot be increased again after the reduction. The obtained mechanical characteristics of circuit breaker opening are as follows: Figure 1 In the design of vacuum circuit breaker based on vacuum arc extinguishing principle, the opening movement speed of the circuit breaker contact needs to be in four stages, such as Figure 2 As shown, the first stage (t1-t2) has a high opening speed, the second stage (t2-t3) has a low opening speed, the third stage (t3-t4) has a high opening speed, and the fourth stage (t4-t5) has a gradually decreasing opening speed until it stops smoothly. In theory, vacuum circuit breakers require such opening characteristics, but the operating mechanism and circuit breaker using the existing technical solution cannot achieve this function. Summary of the invention

[0004] One of the purposes of the present invention is to provide a high-voltage circuit breaker opening buffer structure and a buffer method, which solves the problem that the existing opening buffer mechanism cannot meet the opening motion characteristic requirements of the circuit breaker.

[0005] A second object of the present invention is to provide a high voltage circuit breaker including the opening buffer structure.

[0006] The present invention is achieved through the following technical solutions: The present invention discloses a high-voltage circuit breaker opening buffer structure, comprising a buffer mechanism and a convex profile installed through the outside of a transmission pull rod, wherein the convex profile and the transmission pull rod together form a transmission assembly; the buffer mechanism is arranged on the outer ring of the transmission pull rod, and in the closed state, the buffer mechanism is located at the end of the transmission pull rod; The convex profile includes a deceleration section and an acceleration section, and the shape of the convex profile is designed according to the requirements of acceleration and deceleration during the opening process of the high-voltage circuit breaker; The deceleration section is used to match the deceleration stage, increase the compression of the buffer mechanism, and increase the buffer resistance; the acceleration section is used to match the acceleration stage, reduce the compression of the buffer mechanism, and reduce the buffer resistance.

[0007] Furthermore, when the opening movement speed of the high-voltage circuit breaker is divided into four stages according to the opening time: the first stage, the second stage, the third stage, and the fourth stage; The first stage is the stage with the highest speed and without contact with the buffer mechanism, the third stage is the acceleration stage, and the second and fourth stages are the deceleration stages; The convex profile includes the EF segment, the FG segment, the GH segment, and the HI segment connected in sequence; During the opening process, the EF section corresponds to the second stage, which is the deceleration section. In the EF section, from position E to position F is the uphill section, and the diameter gradually increases. During the opening process, the FG section corresponds to the third stage, which is the acceleration section. In the FG section, from the F position to the G position is a downhill section, and the diameter gradually decreases. During the opening process, the GH section corresponds to the fourth stage, which is the deceleration section. In the GH section, from the G position to the H position is the uphill section, and the diameter gradually increases. During the opening process, the HI section is a stable deceleration stage and the diameter of the HI section is the same.

[0008] Furthermore, the buffer mechanism includes a buffer cylinder, a buffer guide rod, a buffer element and a roller. One end of the buffer guide rod extends into the buffer cylinder, and the other end extends out to connect with the roller. The buffer element is coaxially mounted on the buffer guide rod.

[0009] Furthermore, the buffer element adopts a spring, and the end of the spring is fixed to the buffer guide rod through a limit adjustment nut, and the limit adjustment nut is used to adjust the initial preload force of the spring.

[0010] Furthermore, the buffer mechanism also includes a base, the base is fixed on the frame of the high-voltage circuit breaker, and the buffer cylinder is fixed on the base.

[0011] Furthermore, the roller is fixedly mounted on the end of the buffer guide rod through a pin.

[0012] Furthermore, the buffer mechanism is a damping ring element, which includes an elastic rubber ring, an elastic steel cable is arranged inside the elastic rubber ring, and an adjustment lock buckle for adjusting the length of the elastic steel cable is installed on the elastic steel cable.

[0013] The present invention also discloses a disconnection buffering method of the disconnection buffering structure of a high-voltage circuit breaker, comprising the following process: During the opening movement, the transmission rod drives the convex profile to continuously approach the buffer mechanism from the starting position until the position E of the convex profile reaches the buffer mechanism and comes into contact with the convex profile. The speed is relatively high in the initial stage. As the gate opening movement continues, the convex profile continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile enters the acceleration section or the deceleration section; If the deceleration stage is entered, the compression amount of the buffer mechanism by the convex profile gradually increases, the buffer resistance gradually increases, the buffer resistance is greater than the driving force of the operating mechanism, and the opening characteristic shows a deceleration effect; If the acceleration stage is entered, the compression amount of the buffer mechanism by the convex profile gradually decreases, thereby reducing the buffer resistance. The buffer resistance is smaller than the driving force of the operating mechanism, and the opening characteristic shows an acceleration effect. As the opening movement continues until the opening is in place, the convex profile continues to move toward the buffer mechanism and eventually decelerates smoothly until the opening is completed.

[0014] Furthermore, the convex profile includes the EF segment, the FG segment, the GH segment and the HI segment connected in sequence; during the opening process, the EF segment is the deceleration segment, the FG segment is the acceleration segment, the GH segment is the deceleration segment, and the HI segment is the stable deceleration stage; During the opening movement, the transmission rod drives the convex profile to continuously approach the buffer mechanism from the starting position until the position E of the convex profile reaches the buffer mechanism and comes into contact with the convex profile. At this time, the buffer mechanism has not yet intervened in the opening process, and the speed is relatively high in the initial stage. As the gate opening movement continues, the convex profile continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile changes from position E to position F. Since the convex profile shows an uphill trend from position E to position F, the compression amount of the buffer mechanism gradually increases, and then the buffer resistance gradually increases. The buffer resistance is greater than the driving force of the operating mechanism, and the gate opening characteristic shows a deceleration effect. As the gate opening movement continues, the convex profile continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile changes from position F to position G. Since the convex profile shows a downhill trend from position F to position G, the compression amount of the buffer mechanism gradually decreases, and then the buffer resistance decreases. The buffer resistance is smaller than the driving force of the operating mechanism, and the gate opening characteristic shows an acceleration effect. As the gate opening movement continues, the convex profile continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile changes from position G to position H. Since the convex profile shows an uphill trend from position G to position H, the compression amount of the buffer mechanism increases, and thus the buffer resistance increases. The buffer resistance is greater than the driving force of the operating mechanism, and the gate opening characteristic shows a deceleration effect. As the gate opening movement continues until it is in place, the convex profile continues to move toward the buffer mechanism, showing an uphill trend from position H to position I, increasing the compression of the buffer mechanism, and then increasing the buffer resistance. The buffer resistance is greater than the driving force of the operating mechanism, and finally decelerates smoothly until the gate opening is completed.

[0015] The invention also discloses a high-voltage circuit breaker, comprising the high-voltage circuit breaker opening buffer structure.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a high-voltage circuit breaker opening buffer structure, including a convex profile and a buffer mechanism, the buffer mechanism is arranged on the periphery of a transmission pull rod, and in the present invention, a convex profile is coaxially installed and fixed on the outside of the transmission pull rod, and the shape of the convex profile is designed according to the requirements of acceleration and deceleration in the specific opening process, and the deceleration stage is designed to be uphill, increasing the compression of the buffer damping device or the damping ring element, thereby increasing the buffer resistance; the acceleration stage is designed to be downhill to reduce the compression of the buffer damping device or the damping ring element, thereby reducing the buffer resistance; the opening characteristics of the present invention are generated by the interaction between the buffer mechanism and the convex profile. The buffer mechanism is put into the transmission structure in stages during the opening process, the amount of energy absorbed by the buffer mechanism is changed, the opening speed is controlled, and different opening speed values ​​are achieved in different stages during the opening process, so as to meet the requirements of the normal (or abnormal) current breaking performance of the circuit breaker.

[0017] Furthermore, the present invention designs a convex profile with a four-stage opening characteristic curve, specifically including the EF segment, FG segment, GH segment and HI segment connected in sequence; during the opening process, the EF segment is the deceleration segment, the FG segment is the acceleration segment, the GH segment is the deceleration segment, and the HI segment is the steady deceleration stage, which can realize the circuit breaker opening mechanical characteristics.

[0018] Furthermore, the buffer mechanism adopts a buffer damping device, including a buffer cylinder, a buffer guide rod, a buffer element and a roller. The roller collides and contacts with the convex contour during the gate opening process. When the roller is squeezed, it drives the buffer guide rod to shrink into the buffer cylinder and squeezes the buffer element at the same time to achieve the effect of buffering energy absorption and deceleration.

[0019] Furthermore, the buffer mechanism adopts a damping ring element, including an elastic rubber ring and an elastic steel cable arranged inside the elastic rubber ring. The length of the elastic steel cable is adjustable. The elastic deformation of the elastic rubber ring of the outer ring and the elastic steel cable of the inner ring can be used to buffer energy and achieve the effect of buffering deceleration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The opening characteristic curve obtained by the prior art liquid buffer solution; Figure 2 The opening characteristic curve required for the vacuum circuit breaker; Figure 3 It is a structural schematic diagram of the opening and closing buffer structure of Embodiment 1 of the present invention; Figure 4 is a schematic structural diagram of a buffer damping device according to embodiment 1 of the present invention; Figure 5 It is a structural schematic diagram of a gate-opening buffer structure according to Embodiment 2 of the present invention; Figure 6 is a schematic structural diagram of a damping ring element according to Embodiment 2 of the present invention; Among them, 1. circuit breaker break; 2. transmission pull rod; 3. convex profile; 4. buffer damping device; 5. operating mechanism; 6. damping ring element; 41. base; 42. buffer cylinder; 43. buffer guide rod; 44. roller; 45. pin; 46. limit adjustment nut; 47. buffer element; 61. Elastic rubber ring; 62. Elastic steel cable; 63. Adjustable lock buckle. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clear, the following is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, not all embodiments.

[0022] The components described and shown in the drawings and embodiments of the present invention may be arranged and designed in various configurations. Therefore, the detailed description of the embodiments of the present invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely represents a selected embodiment of the present invention. Based on the drawings and embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0023] It should be noted that the terms "comprises", "includes" or any other variants are intended to cover non-exclusive inclusion, so that a process, element, method, article or device that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to the process, element, method, article or device. In addition, the terms "horizontal" and "vertical" are based on the orientation and positional relationship of the devices or components shown in the drawings, and are only for the purpose of better describing the present invention, rather than requiring the devices, components or equipment shown to have this specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] The high voltage circuit breaker comprises a circuit breaker port 1, a transmission rod 2 and an operating mechanism 5. The operating mechanism 5 is connected to one end of the transmission rod 2 and is used to pull the transmission rod 2 to move and realize opening and closing.

[0025] The present invention mainly provides a high-voltage circuit breaker opening buffer structure, including a buffer mechanism and a convex profile 3 installed outside a transmission rod 2, the convex profile 3 and the transmission rod 2 together form a transmission assembly, and the buffer mechanism is arranged on the outer ring of the transmission rod 2.

[0026] In the closed state, the buffer mechanism is located at the end of the transmission rod 2 and close to one side of the operating mechanism 5 .

[0027] The convex profile 3 is designed according to the acceleration and deceleration requirements during the specific opening process. The deceleration stage is designed to be uphill to increase the compression of the buffer mechanism, thereby increasing the buffer resistance; the acceleration stage is designed to be downhill to reduce the compression of the buffer mechanism, thereby reducing the buffer resistance.

[0028] According to Figure 2 As shown in the opening characteristic curve required by the vacuum circuit breaker, the convex profile 3 of the present invention includes four sections, specifically, the EF section, the FG section, the GH section and the HI section connected in sequence.

[0029] Specifically, during the opening process, the EF segment corresponds to Figure 2 The time period t2-t3 in the diagram is the deceleration section; in the EF section, from position E to position F is the uphill section, and the diameter gradually increases; During the opening process, the FG section corresponds to Figure 2The time period t3-t4 in the figure is the acceleration section; in the FG section, from position F to position G is the downhill section, and the diameter gradually decreases; During the opening process, the GH segment corresponds to Figure 2 The time period t4-t5 in the diagram is the deceleration section; in the GH section, from position G to position H is the uphill section, and the diameter gradually increases; During the opening process, the HI section is a stable deceleration stage, so the diameter of the HI section is the same.

[0030] Preferably, the four transition connections are all arc connections, which reduces the wear of the buffer mechanism and ensures a smooth transition.

[0031] The opening movement process specifically includes the following stages: During the opening movement, the transmission rod 2 is pulled by the operating mechanism to drive the convex profile 3 to continuously approach the buffer mechanism from the starting position until the position E of the convex profile 3 reaches the buffer mechanism and comes into contact with the convex profile 3. At this time, the buffer mechanism has not yet intervened in the opening process, so the speed is relatively high in the first stage (t1-t2); As the gate opening movement continues, the convex profile 3 continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile 3 changes from position E to position F. Since the convex profile 3 shows an uphill trend from position E to position F, the compression amount of the buffer mechanism gradually increases, and then the buffer resistance gradually increases. The buffer resistance is greater than the driving force of the operating mechanism. Figure 2 In the second stage (t2-t3) shown in FIG, the opening characteristic exhibits a deceleration effect; Furthermore, as the gate opening movement continues, the convex profile 3 continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile 3 changes from position F to position G. Since the convex profile 3 shows a downhill trend from position F to position G, the compression amount of the buffer mechanism gradually decreases, and then the buffer resistance decreases. The buffer resistance is smaller than the driving force of the operating mechanism. Figure 2 In the third stage (t3-t4) shown in the figure, the opening characteristic shows an accelerating effect; Finally, as the gate opening movement continues until the gate is in place, the convex profile 3 continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile 3 changes from position G to position H. Since the convex profile 3 shows an uphill trend from position G to position H, the compression amount of the buffer mechanism increases, and then the buffer resistance increases. The buffer resistance is greater than the driving force of the operating mechanism. Figure 2 In the fourth stage (t4-t5) shown in the figure, the opening characteristic shows a deceleration effect; As the gate opening movement continues until the gate is in place, the convex profile 3 continues to move toward the buffer mechanism, showing an uphill trend from position H to position I, increasing the compression of the buffer mechanism, thereby increasing the buffer resistance, which is greater than the driving force of the operating mechanism, and finally decelerating smoothly until the gate opening is completed.

[0032] The features and performances of the present invention are further described in detail below in conjunction with the embodiments.

[0033] Example 1 like Figure 3 As shown, buffer damping devices 4 are arranged on both sides of the transmission rod 2, and a convex profile 3 is coaxially installed and fixed on the outside of the transmission rod 2. The shape of the convex profile 3 can be designed according to the requirements of acceleration and deceleration in the specific opening process. The deceleration stage is designed to be uphill, increasing the compression of the buffer damping device, thereby increasing the buffer resistance, and the acceleration stage is designed to be downhill, reducing the compression of the buffer damping device, thereby reducing the buffer resistance; the opening characteristic (that is, the acceleration and deceleration characteristics designed as needed in the target stage of the opening process) is achieved through the interaction between the buffer damping device 4 and the convex profile 3 on the outside of the transmission component.

[0034] like Figure 4 As shown, the buffer damping device 4 includes a base 41, which is fixedly mounted on the circuit breaker body frame, a buffer cylinder 42 is fixedly mounted on the base 41, a buffer guide rod 43 is coaxially mounted with the buffer cylinder 42, the buffer guide rod 43 can move axially in the buffer cylinder 42, a buffer element 47 is coaxially mounted on the buffer guide rod 43, and the initial preload force of the buffer element 47 can be adjusted by a limit adjustment nut 46, a roller 44 is fixedly mounted on the top of the buffer guide rod 43 by a pin 45, and collides with the convex profile 3 during the opening process, and squeezes the buffer element 47 under the interaction to achieve the effect of buffering energy absorption and deceleration.

[0035] It should be noted that only one embodiment of using a spring as a buffer element in the buffer damping device is shown here. The buffer element of the present invention includes but is not limited to a spring, and a buffer medium (gas, liquid, etc.) may also be used, or it may be a spring damping buffer formed by the combined action of a spring and a cylinder buffer medium.

[0036] like Figure 2 and Figure 3 As shown, during the opening movement, the transmission rod 2 is pulled by the operating mechanism to drive the convex profile 3 to continuously approach the buffer damping device 4 from the starting position until the roller 44 of the buffer damping device 4 comes into contact with the convex profile 3. At this time, the roller 44 reaches the position E of the convex profile 3, and the buffer damping device 4 has not yet intervened in the opening process. Therefore, the speed is relatively high in the first stage (t1-t2); As the gate opening movement continues, since the convex profile 3 shows an upward trend from position E to position F, the compression amount of the buffer damping device 4 increases, and thus the buffer resistance increases, and the contact position between the roller 44 and the convex profile 3 changes from position E to position F. Figure 2 In the second stage (t2-t3) shown in FIG, the opening characteristic exhibits a deceleration effect; Furthermore, as the gate opening movement continues, since the convex profile 3 shows a downward trend from position F to position G, the compression amount of the buffer damping device 4 is reduced, and thus the buffer resistance is reduced, and the contact position 4 between the roller 44 and the convex profile 3 changes from position F to position G. Figure 2 In the third stage (t3-t4) shown in the figure, the opening characteristic shows an accelerating effect; Finally, as the gate opening movement continues until the gate is in place, since the convex profile 3 shows an uphill trend from position G to position H, the compression amount of the buffer damping device 4 increases, and then the buffer resistance increases, and the contact position between the roller 44 and the convex profile 3 changes from position G to position H. Figure 2 In the fourth stage (t4-t5) shown in the figure, the opening characteristic shows a deceleration effect, and finally decelerates smoothly until the opening is completed.

[0037] Example 2 like Figure 5 As shown, a damping ring element is arranged on the outer ring of the transmission rod 2, and a convex profile 3 is coaxially installed and fixed on the outside of the transmission rod 2. The shape of the convex profile 3 can be designed according to the requirements of acceleration and deceleration during the specific opening process; the opening characteristic is achieved through the interaction between the damping ring element 6 and the convex profile 3.

[0038] like Figure 6 As shown, the damping ring element 6 includes an elastic rubber ring 61, an elastic steel cable 62 is arranged inside the elastic rubber ring 61, and an adjusting lock buckle 63 is installed on the elastic steel cable 62. The length of the elastic steel cable 62 is adjusted by adjusting the lock buckle 63, and then the initial preload force is adjusted. With the support of the elastic steel cable 62, the elastic rubber ring 61 collides and contacts with the convex profile 3 during the opening process, and the elastic rubber ring 61 and the elastic steel cable 62 are squeezed by the interaction to achieve the effect of buffering, absorbing energy and decelerating.

[0039] The effective length of the interaction between the internal elastic steel cable 62 and the convex profile 3 is variable under the adjustment of the adjustment lock 63, but once the adjustment lock 63 is locked, the effective length is fixed; the upper and lower surfaces of the elastic rubber ring 61 are limited by baffles with holes, as long as they do not move up and down, which is not shown in the structural diagram.

[0040] like Figure 2 and Figure 5As shown, during the opening movement, the transmission rod 2 is pulled by the operating mechanism to drive the convex profile 3 to continuously approach the damping ring element 6 from the starting position until the damping ring element 6 comes into contact with the convex profile 3. At this time, the position E of the convex profile 3 reaches the damping ring element 6, and the damping ring element 6 has not yet intervened in the opening process. Therefore, the speed is relatively high in the first stage (t1-t2); As the gate opening movement continues, since the convex profile 3 shows an upward trend from position E to position F, the compression amount of the damping ring element 6 increases, and thus the buffering resistance increases. The contact position between the damping ring element 6 and the convex profile 3 changes from position E to position F. Figure 2 In the second stage (t2-t3) shown in FIG, the opening characteristic shows a deceleration effect; the convex profile 3 is made of a solid metal material. To avoid greater wear during the impact process, the elastic rubber ring 61 will produce a certain deformation during the impact process, but under the restriction of the elastic steel cable 62, this deformation is limited and controllable.

[0041] Furthermore, as the gate opening movement continues, since the convex profile 3 shows a downward trend from position F to position G, the compression amount of the damping ring element 6 is reduced, and thus the buffering resistance is reduced, and the contact position between the damping ring element 6 and the convex profile 3 is changed from position F to position G. Figure 2 In the third stage (t3-t4) shown in the figure, the opening characteristic shows an accelerating effect; Finally, as the gate opening movement continues until the gate is in place, since the convex profile 3 shows an uphill trend from position G to position H, the compression amount of the damping ring element 6 increases, thereby increasing the buffering resistance, and the contact position between the damping ring element 6 and the convex profile 3 changes from position G to position H. Figure 2 In the fourth stage (t4-t5) shown in the figure, the opening characteristic shows a deceleration effect, and finally decelerates smoothly until the opening is completed.

[0042] In the prior art solution, the cross-sectional area of ​​the effective working flow holes on the inner cylinder of the buffer gradually decreases during the circuit breaker opening process, so the circuit breaker opening speed gradually decreases until the circuit breaker opening operation is completed. In this process, the circuit breaker opening speed gradually decreases in stages, and cannot be increased again after the reduction.

[0043] A high-voltage circuit breaker opening buffer structure provided by the present invention can achieve the effect of acceleration and deceleration at any stage in the opening process by arranging buffer mechanisms on both sides of the transmission assembly and interacting with the convex profile 3 on the outside of the transmission pull rod 2, thereby solving the technical problem that the existing technical solution cannot accelerate again after deceleration, and can meet the complex characteristic requirements of the vacuum circuit breaker that it first increases in speed, then decelerates, then accelerates, and finally decelerates smoothly until the opening is completed.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A high voltage circuit breaker opening buffer structure, characterized in that: It comprises a buffer mechanism and a convex profile (3) which is installed through the outside of a transmission pull rod (2), the convex profile (3) and the transmission pull rod (2) together forming a transmission assembly; the buffer mechanism is arranged on the outer ring of the transmission pull rod (2), and in a closed state, the buffer mechanism is located at the end of the transmission pull rod (2); The convex profile (3) includes a deceleration section and an acceleration section, and the shape of the convex profile (3) is designed according to the requirements of acceleration and deceleration during the opening process of the high-voltage circuit breaker; The deceleration section is used to match the deceleration stage, increase the compression of the buffer mechanism, and increase the buffer resistance; the acceleration section is used to match the acceleration stage, reduce the compression of the buffer mechanism, and reduce the buffer resistance.

2. A high-voltage circuit breaker opening buffer structure according to claim 1, characterized in that: When the opening movement speed of the high-voltage circuit breaker is divided into four stages according to the opening time: the first stage, the second stage, the third stage, and the fourth stage; The first stage is the stage with the highest speed and without contact with the buffer mechanism, the third stage is the acceleration stage, and the second and fourth stages are the deceleration stages; The convex profile (3) includes the EF segment, the FG segment, the GH segment and the HI segment connected in sequence; During the opening process, the EF section corresponds to the second stage, which is the deceleration section. In the EF section, from position E to position F is the uphill section, and the diameter gradually increases. During the opening process, the FG section corresponds to the third stage, which is the acceleration section. In the FG section, from the F position to the G position is a downhill section, and the diameter gradually decreases. During the opening process, the GH section corresponds to the fourth stage, which is the deceleration section. In the GH section, from the G position to the H position is the uphill section, and the diameter gradually increases. During the opening process, the HI section is a stable deceleration stage and the diameter of the HI section is the same.

3. A high-voltage circuit breaker opening buffer structure according to claim 1, characterized in that: The buffer mechanism comprises a buffer cylinder (42), a buffer guide rod (43), a buffer element (47) and a roller (44); one end of the buffer guide rod (43) extends into the buffer cylinder (42), and the other end extends out to be connected to the roller (44); the buffer element (47) is coaxially mounted on the buffer guide rod (43).

4. A high-voltage circuit breaker opening buffer structure according to claim 3, characterized in that: The buffer element (47) is a spring, the end of which is fixed to the buffer guide rod (43) via a limit adjustment nut (46), and the limit adjustment nut (46) is used to adjust the initial preload force of the spring.

5. A high-voltage circuit breaker opening buffer structure according to claim 3, characterized in that: The buffer mechanism also includes a base (41), the base (41) is fixed on the frame of the high-voltage circuit breaker, and the buffer cylinder (42) is fixed on the base (41).

6. A high-voltage circuit breaker opening buffer structure according to claim 3, characterized in that: The roller (44) is fixedly mounted on the end of the buffer guide rod (43) via a pin (45).

7. A high-voltage circuit breaker opening buffer structure according to claim 1, characterized in that: The buffer mechanism is a damping ring element (6), the damping ring element (6) comprising an elastic rubber ring (61), an elastic steel cable (62) being arranged inside the elastic rubber ring (61), and an adjusting lock buckle (63) for adjusting the length of the elastic steel cable (62) being mounted on the elastic steel cable (62).

8. The opening buffering method of the opening buffering structure of a high-voltage circuit breaker according to any one of claims 1 to 7, characterized in that: The process includes: During the opening movement, the transmission rod (2) drives the convex profile (3) to continuously approach the buffer mechanism from the starting position until the position E of the convex profile (3) reaches the buffer mechanism and comes into contact with the convex profile (3). The speed is relatively high in the initial stage. As the gate opening movement continues, the convex profile (3) continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile (3) enters the acceleration section or the deceleration section; If the vehicle enters the deceleration stage, the compression amount of the buffer mechanism by the convex profile (3) gradually increases, the buffer resistance gradually increases, and the opening characteristic shows a deceleration effect; When entering the acceleration stage, the compression amount of the buffer mechanism by the convex profile (3) gradually decreases, thereby reducing the buffer resistance; As the gate opening movement continues until the gate is in place, the convex profile (3) continues to move towards the buffer mechanism and eventually decelerates smoothly until the gate opening is completed.

9. The gate opening buffering method according to claim 8, characterized in that: The convex profile (3) includes an EF segment, an FG segment, a GH segment and a HI segment connected in sequence; during the opening process, the EF segment is a deceleration segment, the FG segment is an acceleration segment, the GH segment is a deceleration segment, and the HI segment is a stable deceleration stage; During the opening movement, the transmission rod (2) drives the convex profile (3) to continuously approach the buffer mechanism from the starting position until the position E of the convex profile (3) reaches the buffer mechanism and comes into contact with the convex profile (3). At this time, the buffer mechanism has not yet intervened in the opening process, and the speed is relatively high in the initial stage. As the gate opening movement continues, the convex profile (3) continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile (3) changes from position E to position F. Since the convex profile (3) shows an uphill trend from position E to position F, the compression amount of the buffer mechanism gradually increases, and thus the buffer resistance gradually increases. The buffer resistance is greater than the driving force of the operating mechanism, and the gate opening characteristic shows a deceleration effect. As the gate opening movement process continues, the convex profile (3) continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile (3) changes from position F to position G. Since the convex profile (3) shows a downward trend from position F to position G, the compression amount of the buffer mechanism gradually decreases, thereby reducing the buffer resistance. The buffer resistance is smaller than the driving force of the operating mechanism, and the gate opening characteristic shows an acceleration effect. As the gate opening movement process continues, the convex profile (3) continues to move toward the buffer mechanism, and the contact position between the buffer mechanism and the convex profile (3) changes from position G to position H. Since the convex profile (3) shows an uphill trend from position G to position H, the compression amount of the buffer mechanism increases, thereby increasing the buffer resistance. The buffer resistance is greater than the driving force of the operating mechanism, and the gate opening characteristic shows a deceleration effect. As the gate opening movement continues until the gate is in place, the convex profile (3) continues to move towards the buffer mechanism, showing an uphill trend from position H to position I, increasing the compression of the buffer mechanism, thereby increasing the buffer resistance, which is greater than the driving force of the operating mechanism, and finally decelerating smoothly until the gate opening is completed.

10. A high voltage circuit breaker, characterized in that: A high-voltage circuit breaker opening buffer structure comprising the structure described in any one of claims 1 to 7.

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