Buffering and limiting structure of large-current rapid energy dissipation grounding knife-switch
By setting a buffer block and a limit buffer groove at the lower end of the grounding stationary contact, combined with an elastic clamping component, the problem of the moving contact blade rebounding during the closing process is solved, thereby improving the grounding reliability and equipment durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-03-27
AI Technical Summary
In existing ring main units, during the closing process, the moving contact of the grounding switch may strike the solid pole and bounce back, resulting in poor or no contact, causing the circuit breaker to fail to ground properly, which poses a safety hazard.
A high-current fast energy dissipation grounding switch buffer limit structure is designed, including a grounding stationary contact, a moving contact, a buffer block, and an elastic clamping component. By setting a buffer block and a limit buffer groove at the lower end of the grounding stationary contact, the kinetic energy of the moving contact is consumed in stages, and the elastic clamping component provides pre-tightening force to ensure contact reliability.
It effectively dissipates the kinetic energy of the moving contact blade, avoids direct impact on the solid-sealed pole, reduces the risk of rebound, improves contact reliability, and extends equipment life. It is suitable for high-frequency or high-capacity circuit breakers.
Smart Images
Figure CN224053083U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power transmission and distribution switchgear technical field, concretely relates to a big current quick energy dissipation grounding knife switch buffering and limiting structure. BACKGROUND
[0002] The gassing ring net cabinet is widely used in the medium and high voltage power transmission and distribution network, carries out the distribution and the protection of line of electric energy, and the ring net cabinet has the vacuum circuit breaker, the isolating switch, the grounding switch, and the grounding switch in the prior art ring net cabinet often adopts the grounding knife switch type, when the circuit breaker needs grounding, the grounding knife switch is driven by the operating mechanism to quickly complete the closing operation. SUMMARY
[0003] Therefore, the utility model wants to solve the technical problem in prior art that the movable contact knife will hit the fixed pole and bounce up again under the action of kinetic energy during the grounding closing process, resulting in the phenomenon of poor contact or even no contact between the movable contact knife and the grounding static contact, which leads to the problem that the circuit breaker cannot be normally grounded.
[0004] To solve the above problems, the utility model provides a big current quick energy dissipation grounding knife switch buffering and limiting structure, which comprises:
[0005] The grounding static contact is fixed on the grounding row.
[0006] The movable contact knife is rotatably arranged on the fixed pole of the circuit breaker under the drive of the operating mechanism.
[0007] The buffering block is fixedly connected to the lower end of the grounding static contact, and the buffering block and the grounding static contact form two limiting buffering grooves arranged on both sides of the grounding static contact.
[0008] The elastic clamping piece is arranged around the outside of the buffering block, so that when the buffering block is pressed to produce elastic deformation, the elastic clamping piece is extruded outward.
[0009] As a preferred scheme, the limiting buffering groove extends along the length direction of the grounding static contact by a certain distance, the movable contact knife comprises two contact blades arranged oppositely, and the width of the limiting buffering groove is equal to or less than the width of the contact blade.
[0010] As a preferred scheme, the buffer block comprises a transverse buffer part connected perpendicularly with the ground static contact, and two vertical buffer parts extending along the length of the ground static contact are arranged at both ends of the transverse buffer part, and the two vertical buffer parts are oppositely arranged on both sides of the ground static contact, and two limiting buffer grooves are formed between the two vertical buffer parts and the ground static contact.
[0011] As a preferred scheme, the side wall of the limiting buffer groove towards the ground static contact is an inclined side wall.
[0012] As a preferred scheme, a circular arc guide surface is formed between the top of the vertical buffer part and the side wall of the limiting buffer groove.
[0013] As a preferred scheme, the elastic clamping piece is a spring piece structure wrapped outside the buffer block, and the spring piece structure and the buffer block are arranged on the upper side of the sealed pole.
[0014] As a preferred scheme, the spring piece structure comprises a containing groove suitable for containing the buffer block, and two limiting clamping pieces clamping and contacting the outer walls on both sides of the buffer block.
[0015] As a preferred scheme, the top end of each of the two limiting clamping pieces is provided with a circular arc-shaped extrusion protrusion abutting and contacting the outer wall on the side of the buffer block.
[0016] As a preferred scheme, the upper end of the ground static contact is bent into a T-shaped connecting part, and the connecting part is fixed on the ground bar through a bolt assembly.
[0017] As a preferred scheme, the spring piece structure and the buffer block are fixedly connected to the lower end of the ground static contact through a screw structure.
[0018] Compared with the prior art, the technical scheme of the utility model has the following advantages:
[0019] 1. The large current quick energy dissipation grounding knife switch buffering and limiting structure provided by the utility model, through setting a buffering block at the lower end of the grounding static contact, and forming two limiting buffering grooves between the buffering block and the grounding static contact, in the grounding closing process, the moving contact knife will first contact the grounding static contact, realizing the first level kinetic energy consumption; then, the moving contact knife moves to the two limiting buffering grooves and is extruded, realizing the second level kinetic energy consumption; finally, when the moving contact knife moves to the lowermost end of the grounding static contact, it will contact the buffering block with soft quality, thereby greatly consuming the energy of the moving contact knife, realizing the third level kinetic energy consumption, even if the moving contact knife bounces up again, it will also experience multi-level consumption again in reverse order, greatly reducing the possibility of the moving contact knife separating from the grounding static contact, enabling the circuit breaker to safely close the grounding, according to the elastic deformation effect of the buffering block under pressure, the elastic clamping piece wrapped outside the buffering block can provide pre-tightening force compensation for the buffering block, thereby ensuring the shape and contact pressure of the buffering block, the technical scheme optimizes the mechanical dynamics, converts the traditional rigid collision into a controllable energy dissipation process, realizes the coordinated improvement of contact reliability and mechanical durability in the microsecond level closing action, and is suitable for the harsh working condition requirements of high operation frequency or large capacity circuit breakers.
[0020] 2. In the large current quick energy dissipation grounding knife switch buffering and limiting structure, the kinetic energy of the moving contact knife can be dispersed, and the direct impact on the pole is reduced through the structural optimization design of the grounding static contact, the buffering block and the elastic clamping piece. This design has the following advantages: first, after the moving contact knife is inserted into the limiting buffering groove, the impact with the buffering block will convert the remaining kinetic energy into elastic potential energy (buffering block deformation) and friction heat energy, avoiding direct impact on the solid-sealed pole, realizing kinetic energy grading dissipation, and inhibiting the rebound risk effect; second, the elastic clamping piece provides progressive resistance for the buffering block, prolongs the deceleration time of the moving contact knife, reduces the instantaneous impact peak, further inhibits the rebound, and provides double protection of contact pressure; third, the concentrated impact load is dispersed to a larger structural area through the cooperation of the buffering block and the elastic clamping piece, reducing the fatigue damage of the contact and the pole, realizing the effect of dispersing impact stress and prolonging the service life of the equipment.
[0021] 3. In the large current quick energy dissipation grounding knife switch buffering and limiting structure, according to the buffering block composed of a horizontal buffering part and two vertical buffering parts, the two limiting buffering grooves are formed between the two vertical buffering parts and the grounding static contact. This structure sets up the limiting buffering grooves on both sides of the grounding static contact to form physical stop and kinetic energy buffering effect, so as to limit the lateral deviation of the moving contact knife, prevent misalignment separation caused by inertia or vibration, and guide the moving contact knife to move along the preset path through the limiting buffering grooves, reduce the eccentric wear phenomenon, and prolong the service life of the contact.
[0022] 4. In the large current fast energy dissipation grounding knife switch buffer limiting structure, the elastic clamping piece is a spring piece structure wrapped outside the buffer block, the spring piece structure has two limiting clamping pieces clamped and contacted on the outer walls of both sides of the buffer block, the structure is provided, the spring piece structure can absorb the impact energy of the buffer block through multiple elastic deformations of itself, so as to limit the excessive deformation of the buffer block; and the elastic clamping piece provides continuous resilience for the buffer block, which helps the buffer block to recover deformation and maintain close contact with the moving contact knife, the elastic clamping structure can reduce stress concentration and fatigue damage of the buffer block, can significantly improve the durability of the buffer block, and can play a role in dispersing impact stress. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows.
[0024] Figure 1 It is a perspective view of the grounding knife switch buffer limiting structure of the present application.
[0025] Figure 2 It is a side view of the grounding knife switch buffer limiting structure of the present application.
[0026] Figure 3 It is Figure 2 It is a sectional structure side view along line A-A.
[0027] Figure 4 It is an installation structure schematic view of the grounding static contact, the buffer block and the spring piece structure of the present application.
[0028] Explanation of reference signs: 1, grounding static contact; 11, connecting part; 2, buffer block; 21, transverse buffer part; 22, vertical buffer part; 23, circular arc guide surface; 3, elastic clamping piece; 31, limiting clamping piece; 32, extrusion protrusion; 4, moving contact knife; 5, limiting buffer groove; 6, solid seal pole; 7, grounding row. DETAILED DESCRIPTION
[0029] The technical solutions of the present application will be described clearly and completely in combination with the drawings, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0030] In the description of the utility model, it is necessary to explain that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0031] Embodiment
[0032] The embodiment will be specifically described below in combination with the drawings:
[0033] The utility model provides a kind of large current quick energy consumption grounding knife gap buffer limiting structure as Figures 1-4 As shown in kind, including: moving contact knife 4, grounding static contact 1, buffer block 2 and elastic clamping piece 3, wherein, grounding static contact 1 is fixed on grounding row 7, and grounding row 7 is set on switchgear rack;The moving contact knife 4 is rotated and arranged on the solid sealed pole 6 of circuit breaker by the driving of operating mechanism;Buffer block 2 is fixedly connected at the lower end of grounding static contact 1, and the buffer block 2 and grounding static contact 1 form two limiting buffer grooves 5 arranged on the both sides of grounding static contact 1, and the moving contact knife 4 first contacts grounding static contact 1, then extrudes and inserts into limiting buffer groove 5 and hits and contacts buffer block 2 when grounding closing;Buffer block 2 is arranged with elastic clamping piece 3 outside, so that buffer block 2 extrudes elastic clamping piece 3 when being pressed to produce elastic deformation.
[0034] The above embodiment is the core technical scheme of the present embodiment, by setting a buffer block 2 at the lower end of the grounding static contact 1, and forming two limiting buffer grooves 5 between the buffer block 2 and the grounding static contact 1, in the grounding closing process, the moving contact knife 4 will first contact the grounding static contact 1, realizing the first level of kinetic energy consumption; then, the moving contact knife 4 moves to the two limiting buffer grooves 5 and is extruded, realizing the second level of kinetic energy consumption; finally, when the moving contact knife 4 moves to the lowermost end of the grounding static contact 1, it will contact the relatively soft buffer block 2, thereby greatly consuming the energy of the moving contact knife 4, realizing the third level of kinetic energy consumption, even if the moving contact knife 4 bounces up again, it will also experience multiple levels of consumption in reverse order again, greatly reducing the possibility of the moving contact knife 4 separating from the grounding static contact 1, so that the circuit breaker can safely close the ground, according to the elastic deformation effect of the buffer block 2 under pressure, the elastic clamping piece 3 wrapped outside the buffer block 2 can provide pre-tightening force compensation for the buffer block 2, thereby ensuring the shape and contact pressure of the buffer block, the present technical scheme optimizes the mechanical dynamics, converts the traditional rigid collision into a controllable energy dissipation process, realizes the coordinated improvement of contact reliability and mechanical durability in the microsecond level closing action, and is suitable for the harsh working condition requirements of high operation frequency or large capacity circuit breakers.
[0035] The following will be described in detail in combination with Figures 1-4 The specific setting mode of the buffer block will be described in detail:
[0036] The buffer block 2 is made of polyurethane material and has high elasticity, strong shock absorption, tear resistance, good shock absorption and buffering performance and high mechanical strength, the buffer block 2 includes a transverse buffer part 21 connected vertically with the grounding static contact 1, and two vertical buffer parts 22 extending along the length of the grounding static contact 1 are arranged at both ends of the transverse buffer part, the two vertical buffer parts 22 are oppositely arranged on both sides of the grounding static contact 1, and two limiting buffer grooves 5 are formed between the two vertical buffer parts 22 and the grounding static contact 1, wherein the limiting buffer grooves 5 extend along the length direction of the grounding static contact 1 by a certain distance, the moving contact knife 4 includes two contact blades oppositely arranged, the width of the limiting buffer groove 5 is equal to or less than the width of the contact blade, so that the moving contact knife 4 will be extruded with the vertical buffer part 22 during the process of inserting into the limiting buffer groove 5, thereby playing a buffering role, this structure setting forms a physical stop and kinetic energy buffering effect through the limiting buffer grooves 5 arranged on both sides of the grounding static contact 1, so as to limit the lateral deviation of the moving contact knife 4, prevent misalignment caused by inertia or vibration, and guide the moving contact knife to move along the preset path through the limiting buffer grooves 5, reduce the eccentric wear phenomenon, and prolong the service life of the contact.
[0037] It is further preferred to set, refer to Figure 4The side wall of the limiting buffer groove 5 towards the side of the grounding static contact 1 is provided as an inclined side wall, and a circular arc guide surface 23 is formed between the top of the vertical buffer part 22 and the side wall of the limiting buffer groove 5, which plays a guiding role when the movable contact blade 4 enters the buffer groove, guides the movable contact blade 4 to move along a predetermined track, and avoids abnormal operation caused by deviation or jamming. As can be seen from the above, the buffer block gradually contacts the movable contact blade 4 through the extrusion effect of the width difference (buffer groove width < movable contact blade width) and the inclined side wall, and the elastic deformation of the material absorbs the impact energy, reduces the instantaneous impact force at the end of the action, enhances the energy absorption, realizes staged buffering, avoids rigid collision, and prolongs the service life of the equipment.
[0038] In the embodiment, as shown in the drawings, Figures 2-4 The elastic clamping piece 3 is a spring structure wrapped outside the buffer block 2, and the spring structure and the buffer block 2 are arranged on the upper side of the solid-sealed pole 6. Specifically, the bottom of the spring structure is in contact with the outer wall of the solid-sealed pole 6. Through the structural optimization design of the grounding static contact 1, the buffer block 2 and the elastic clamping piece 3, the kinetic energy of the movable contact blade 4 can be dispersed, and the direct impact on the pole can be reduced. This design has the following advantages: first, after the movable contact blade is inserted into the limiting buffer groove 5, the impact with the buffer block 2 converts the remaining kinetic energy into elastic potential energy (buffer block deformation) and friction heat energy, avoiding direct impact on the solid-sealed pole 6, realizing kinetic energy grading dissipation, and inhibiting the rebound risk; second, the elastic clamping piece 3 provides progressive resistance for the buffer block 2, prolongs the deceleration time of the movable contact blade, reduces the instantaneous impact peak, further inhibits the rebound, and provides double protection of contact pressure; third, the concentrated impact load is dispersed to a larger structural area through the cooperation of the buffer block 2 and the elastic clamping piece 3, reducing the fatigue damage of the contact and the pole, realizing the effect of dispersing impact stress, and prolonging the service life of the equipment.
[0039] As a preferred embodiment, the spring structure includes a containing groove suitable for containing the buffer block 2, and two limiting clamping pieces 31 clamping and contacting the outer walls on both sides of the buffer block 2. The top ends of the two limiting clamping pieces 31 are respectively provided with two circular-arc-shaped extrusion protrusions 32 in contact with the outer walls on both sides of the buffer block 2. Through this structure, the spring structure can absorb the impact energy of the buffer block 2 through multiple elastic deformations, thereby limiting the excessive deformation of the buffer block 2; and the elastic clamping piece provides a continuous rebound force for the buffer block 2, which helps the buffer block 2 to recover the deformation and maintain close contact with the movable contact blade 4. Through the design of the elastic clamping piece, the stress concentration and fatigue damage of the buffer block 2 can be reduced, the durability of the buffer block can be significantly improved, and the effect of dispersing impact stress can be achieved.
[0040] As shown in the drawings, Figure 4As shown, the upper end of the grounding static contact 1 is bent and formed with a T-shaped connecting part 11, the connecting part 11 is fixed on the grounding row 7 through a bolt assembly, in addition, the buffer block 2 is fixedly connected to the lower end of the grounding static contact through a screw structure, a fixing hole matched with the screw structure is arranged at the lower end of the grounding static contact, the screw structure is fastened in the fixing hole after penetrating through the buffer block 2 upward, the spring sheet structure and the buffer block 2 can be fixed through the screw or through gluing, after installation, the spring sheet structure is limited between the buffer block 2 and the fixed sealing pole 6, so that the installation and fixation among the spring sheet structure, the buffer block and the grounding static contact are realized.
[0041] Obviously, the above examples are only examples for clearly illustrating but not limitation to the embodiments. Other different forms of changes or variations can be made by those skilled in the art on the basis of the above description. All the embodiments do not need to be exhausted and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.
Claims
1. A large-current fast energy-dissipation grounding knife switch buffer limiting structure, characterized in that, The utility model relates to a circuit breaker grounding contact buffer structure, including: Grounding static contact (1) is fixed on the grounding row (7); Movable contact blade (4) is rotated and arranged on the fixed pole (6) of circuit breaker under the drive of operating mechanism; Buffer block (2) is fixedly connected to the lower end of the grounding static contact (1), and two limiting buffer grooves (5) are formed between the buffer block (2) and the grounding static contact (1) and arranged on both sides of the grounding static contact (1), the movable contact blade (4) first contacts the grounding static contact (1) and then is inserted into the limiting buffer groove (5) and hits the buffer block (2) when grounding is closed; Elastic clamping piece (3) is arranged outside the buffer block (2), and the buffer block (2) is extruded to the elastic clamping piece (3) when the buffer block (2) is elastically deformed under pressure.
2. The buffer limiting structure of the high-current fast energy-consuming grounding knife switch according to claim 1, characterized in that: The limiting buffer groove (5) extends along the length direction of the grounding static contact (1) and is arranged at a distance, the movable contact blade (4) includes two contact blades arranged oppositely, and the width of the limiting buffer groove (5) is less than the width of the contact blade.
3. The buffer limiting structure of the high current fast energy dissipation grounding knife switch according to claim 1, characterized in that: The buffer block (2) includes a transverse buffer part (21) connected perpendicularly to the grounding static contact (1), two vertical buffer parts (22) arranged at both ends of the transverse buffer part and extending along the length of the grounding static contact (1), and the two vertical buffer parts (22) are arranged oppositely on both sides of the grounding static contact (1), and the two limiting buffer grooves (5) are formed between the two vertical buffer parts (22) and the grounding static contact (1).
4. The buffer limiting structure of the high-current fast energy-consuming grounding knife switch according to claim 3, characterized in that: The side wall of the limiting buffer groove (5) towards the grounding static contact (1) is arranged as an inclined side wall.
5. The buffer limiting structure of the high current fast energy dissipation grounding knife switch according to claim 4, characterized in that: A circular arc guide surface (23) is formed between the top of the vertical buffer part (22) and the side wall of the limiting buffer groove (5).
6. The buffer and limit structure of the high current fast energy dissipation grounding knife switch according to any one of claims 1-5, characterized in that: The elastic clamping piece (3) is a spring structure wrapped outside the buffer block (2), and the spring structure and the buffer block (2) are arranged on the upper side of the fixed pole (6).
7. The buffer stop structure of the high current fast energy dissipation grounding knife switch according to claim 6, characterized in that: The spring structure includes a containing groove suitable for containing the buffer block (2) and two limiting clamping pieces (31) clamped and contacted on the outer walls of both sides of the buffer block (2).
8. The buffer stop structure of the high current fast energy dissipation grounding knife switch according to claim 7, characterized in that: The top ends of the two limiting clamping pieces (31) are respectively provided with two arc-shaped extrusion protrusions (32) abutting and contacted on the outer walls of both sides of the buffer block (2).
9. The buffer stop structure of the high current fast energy dissipation grounding knife switch according to claim 1, characterized in that: The upper end of the grounding static contact (1) is bent to form a T-shaped connecting part (11), and the connecting part (11) is fixed on the grounding row (7) through a bolt assembly.
10. The buffer stop structure of the high current fast energy dissipation grounding knife switch according to claim 1, characterized in that: The buffer block (2) is fixedly connected to the lower end of the grounding static contact through a screw structure.