A friction damping shock absorption device for electrical equipment

Abstract

A friction damping shock absorber for an electrical device, the electrical device being a pillar-type electrical device, the device being located between the electrical device and the device bracket, the device comprising a cylinder body, a transmission shaft coaxially arranged with the cylinder body, upper and lower friction assemblies symmetrically and coaxially arranged, and a coaxial connecting rod located on one side of the inner wall of the cylinder body; the upper and lower friction assemblies are composed of an inner ring and an outer ring with tapered surfaces in contact. The present invention effectively improves the shock absorption performance of the shock absorber through two forms of friction and damping, and greatly extends the service life of the shock absorber.

Description

Technical Field

[0001] The present invention relates to a shock absorption device, and more particularly to a friction damping shock absorption device for pillar-type electrical equipment in a substation. Background Art

[0002] Due to the uneven distribution of energy bases and power consumption loads, a large number of substations (converter stations) need to be built in seismic unfavorable areas with high seismic intensities. The key equipment in substations (converter stations) is pillar-type electrical equipment (lightning arresters, instrument transformers, etc.). Such equipment usually uses porcelain materials to ensure insulation performance. However, due to the electrical clearance requirements, the equipment structure is thin and tall. Therefore, it is difficult to balance the seismic performance in the design and manufacture of the equipment, resulting in serious seismic damage to pillar-type equipment.

[0003] However, the existing shock absorption devices have deficiencies in both structural design and material selection. The shock absorption effect is only achieved by friction energy dissipation, making it difficult to ensure the safety of electrical equipment and the stability of seismic performance, and unable to meet the requirements of electrical equipment in high seismic intensity areas. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a friction damping shock absorption device for electrical equipment.

[0005] The technical solution provided by the present invention is as follows:

[0006] A friction damping shock absorption device for electrical equipment, wherein the electrical equipment is pillar-type electrical equipment, and the shock absorption device is located between the electrical equipment and the equipment support. The device includes a cylinder body, a transmission shaft coaxially arranged with the cylinder body, upper and lower friction components symmetrically and coaxially arranged, and an axial connecting rod located on one side of the inner wall of the cylinder body;

[0007] The upper and lower friction components are composed of an inner ring and an outer ring with tapered surfaces in contact.

[0008] Further, an axial damper is provided between the upper and lower inner rings.

[0009] Further, radial baffles and transmission connecting plates for connecting the transmission shaft and the connecting rod are respectively provided at the outer ends of the upper and lower friction components.

[0010] Further, the cylinder body is provided with concave upper and lower end covers, and grooves for the baffles and the transmission connecting plates to move up and down are respectively provided at the concave parts of the upper and lower end covers.

[0011] Further, coaxial through holes for the transmission shaft to pass through are provided on the upper end cover and the baffle.

[0012] Further, the inner ring is a single tapered surface ring, and the outer ring is composed of at least two segmented rings.

[0013] Further, each of the segmented rings is provided with an axial through hole for the connecting rod to pass through.

[0014] Further, an elastic component coaxial with the transmission shaft is provided between the upper and lower friction components.

[0015] Further, a washer is provided between the outer ring and the elastic component.

[0016] Further, the connecting rod comprises the following components by mass percentage: C 0.65%, Al 0.85%, Si 0.45%, Mo 0.25%, V 0.18%, Ti 0.15%, B 0.002%, Re 0.25%, Mg 0.25%, and the balance is Fe and impurities.

[0017] Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

[0018] 1) The shock absorption device provided by the present invention has a compact structure and a clear shock absorption mechanism. Through the mutual cooperation among the friction component, the damper and the elastic component, a double energy dissipation effect of friction and damping is achieved, further improving the shock absorption performance of the shock absorption device. Moreover, the connecting rod provided by the present invention has excellent wear resistance and high strength, can effectively extend the service life, and greatly improves the reliability of the shock absorption device.

[0019] 2) The shock absorption device provided by the present invention is provided with a trigger force when the electrical equipment is working normally to ensure that the equipment will not malfunction; during an earthquake, the seismic energy transmitted into the electrical equipment is dissipated through the reciprocating friction and damping mechanism, and the greater the swing amplitude of the equipment, the greater the friction force and the higher the shock absorption efficiency; after the earthquake, the equipment can be reset through the self-recovery mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A - A sectional view of the shock absorption device provided by the present invention;

[0021] Figure 2 Top view of the shock absorption device provided by the present invention;

[0022] Figure 3 Installation schematic diagram of the shock absorption device provided by the present invention;

[0023] Figure 4 Front view of the lower friction component of the shock absorption device provided by the present invention;

[0024] Figure 5 Bottom view of the lower friction component of the shock absorption device provided by the present invention;

[0025] Figure 6 Front view of the transmission connecting rod of the shock absorption device provided by the present invention;

[0026] Figure 7Bottom view of the drive link of the shock absorber provided by the present invention;

[0027] Figure 8 Top view of the drive link plate of the shock absorber provided by the present invention;

[0028] Figure 9 Bottom view of the upper end cover of the shock absorber provided by the present invention;

[0029] Figure 10 Top view of the lower end cover of the shock absorber provided by the present invention;

[0030] Inner retaining ring; 1 Lower end cover; 2 Cylinder body; 3 Upper end cover; 4 Transmission shaft; 5 Inner ring; 6 Outer ring; 7 Damper; 8 Elastic component; 9 Drive link plate; 10 Baffle; 11 Link; 12 Washer; 13 Shock absorber; 14 Bracket; 15 Support mechanism; 16 Electrical equipment. Detailed implementation manners

[0031] The technical solution provided by the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the present invention, rather than all of it.

[0032] To solve the deficiencies existing in both the structural design and material selection of the existing shock absorbers, the present invention provides a friction damping shock absorber for electrical equipment. The "electrical equipment" in the present invention refers to pillar-type electrical equipment such as lightning arresters and instrument transformers in a substation (converter station).

[0033] As Figure 1-2 shown, the shock absorber provided by the present invention includes a cylinder body 2, a transmission shaft 4 coaxially arranged with the cylinder body 2, upper and lower friction components symmetrically and coaxially arranged, and an axial link 11 located on one side of the inner wall of the cylinder body 2; as Figure 6-7 shown is a schematic diagram of the drive link including the transmission shaft 4 and the axial link 11; the upper and lower friction components are composed of an inner ring 5 and an outer ring 6 with conical surfaces in contact. The front view and bottom view of the lower friction component are as Figure 4-5 shown. An axial damper 7 is provided between the upper and lower inner rings. A radial baffle 10 connecting the transmission shaft 4 and the link 11 is provided at the outer end of the upper friction component, and a radial drive link plate 9 connecting the transmission shaft 4 and the link 11 is provided at the outer end of the lower friction component. Its bottom view is as Figure 8 shown. The cylinder body 2 is provided with a concave upper end cover 3 and a lower end cover 1. As Figure 9 shown, a groove for the up and down movement of the baffle 10 is provided in the concave part of the upper end cover 3. As Figure 10As shown in the figure, a groove for the up-and-down movement of the transmission connecting plate 9 is provided in the recess of the lower end cover 1. The upper end cover 3 and the baffle 10 are provided with coaxial through holes for the transmission shaft 4 to pass through. The inner ring 5 is a single conical surface ring, and the outer ring 6 is composed of at least two segmented rings. Each of the segmented rings is provided with an axial through hole for the connecting rod 11 to pass through. An elastic component 8 coaxial with the transmission shaft 4 is provided between the upper and lower friction components. A washer is provided between the outer ring 6 and the elastic component 8.

[0034] The connecting rod 11 comprises the following components by mass percentage: C 0.65%, Al 0.85%, Si 0.45%, Mo 0.25%, V 0.18%, Ti 0.15%, B 0.002%, Re 0.25%, Mg 0.25%, and the balance is Fe and impurities.

[0035] The elastic component 8 is preferably a cylindrical helical compression spring, a cylindrical helical compression spring with a rectangular cross-section, a disc spring, etc., and is selected according to the output force and size during design. A damper 7 is installed between the upper and lower groups of friction components. The two inner rings 5 and the damper 7 can be connected by threads. The bottom of the connecting rod 11 has threads and is connected to the transmission connecting plate 9 through a nut. The friction component is composed of the outer ring 6 and the inner ring 5. The inner ring 5 is a complete outer conical surface ring, and the outer ring 6 is composed of at least two segmented rings. Each segmented ring has 1 vertical through hole. The inner and outer conical surfaces of the outer ring 6 and the inner ring 5 are fitted to form a friction component. The connecting rod 11 passes through the outer rings 6 at the upper and lower ends, and there is a certain gap between the connecting rod 11 and the through hole. The bottom of each connecting rod 11 has threads and is connected to the transmission connecting plate 9 through a nut. The baffle 10, the connecting rod 11 and the transmission connecting plate 9 jointly press the friction component and the elastic component 8. The outer retaining rings of the upper end cover 3 and the lower end cover 1 are connected to the cylinder body 2 by screws. The inner retaining rings 0 of the upper end cover 3 and the lower end cover 1 are provided with grooves with the same number as the number of segmented rings, which can accommodate the up-and-down movement of the baffle 10 and the transmission connecting plate 9.

[0036] As Figure 3 shown in the figure, when installing the shock absorption device 13 of the electrical equipment, a support mechanism 15 is welded or bolted between the electrical equipment 16 and its bracket 14 at the center position of the top plate of the bracket. The electrical equipment 16 is floatingly placed on the support mechanism 15. The support mechanism 15 is preferably a cylinder. The shock absorption device 13 is installed between the electrical equipment 16 and its bracket 14 and is arranged around the support mechanism 15. The number of shock absorption devices 13 should be the same as the number of mounting holes of the bottom flange of the electrical equipment 16. The diameter of the bolt rod of the shock absorption device 13 should match the opening of the bottom flange of the electrical equipment 16. The body of the shock absorption device 13 passes through the opening of the top plate of the bracket 14. The top bolts of each shock absorption device 13 pass through the holes of the bottom flange of the electrical equipment 16 and are fixed to the bottom flange of the electrical equipment 16 through the upper and lower groups of nuts. The nuts should be selected with spring washers or double nuts to prevent loosening.

[0037] When the electrical equipment 16 is not installed conventionally with a shock-absorbing device, the electrical equipment 16 is directly placed on the top plate of the bracket 14 and connected by bolts and nuts. After selecting this shock-absorbing device, only the diameter of the hole on the top plate of the bracket 14 needs to be enlarged to the body size of the shock-absorbing device 13. Without changing the original installation layout form, only this shock-absorbing device 13 and the support mechanism 15 need to be added between the electrical equipment 16 and its bracket 14.

[0038] The working principle of the shock-absorbing device is as follows: In the initial state, the elastic component 8 is compressed, and the elastic component 8 with a pre-tightening force presses the outer ring 6 in the friction component. Through the contact cone surface between the outer ring 6 and the inner ring 5, a pressure is generated between the outer ring 6 and the inner wall of the cylinder body 2. When the electrical equipment 16 is in a normal working state or is subjected to a small external force (such as wind load or opening / closing operating force), the external force cannot overcome the static friction force between the outer ring 6 and each friction surface and the pre-tightening force of the elastic component. At this time, the shock-absorbing device 13 does not act. When an earthquake that may damage the equipment occurs, the electrical equipment 16 swings under the action of the earthquake. The bottom flange of the electrical equipment 16 uses the support mechanism 15 as a fulcrum to drive the shock-absorbing devices 13 on both sides to reciprocate up and down. At this time, the external force overcomes the static friction force between the outer ring 6 and the friction surface and the elastic force of the elastic component 8, and the shock-absorbing device 13 is triggered to start working. When the connecting rod 11 moves downward, it drives the upper friction component to move downward, and the elastic component 8 is further compressed. At this time, the friction force between the upper friction component and the inner wall of the cylinder body 2 further increases, while the lower friction component is blocked by the inner retaining ring 0 of the lower end cover 1 and thus does not move. While the friction component moves downward, it drives the damper 7 to consume energy. When the connecting rod 11 moves upward, it drives the lower friction component to move upward, and the compression amplitude of the elastic component 8 gradually increases. At this time, the friction force between the lower friction component and the inner wall of the cylinder body 2 increases accordingly, while the upper friction component is blocked by the inner retaining ring 0 of the lower end cover 1 and thus does not move. While the friction component moves upward, it drives the damper 7 to consume energy. The clearance distance between the inner ring 5 and the upper end cover 3 and the clearance distance between the transmission connecting plate 9 and the lower end cover 1 are the upper and lower strokes of the shock-absorbing device 13. After the earthquake stops, under the action of the restoring force of the elastic component 8, the friction component and the damper 7 are pushed back to their original positions. Therefore, it should be ensured that the elastic restoring force is greater than the friction force during design. When the electrical equipment 16 is working normally, the shock-absorbing device plays a role in connecting and fixing the equipment. When an earthquake occurs, the shock-absorbing device 13 is triggered, and through two shock-absorbing mechanisms of friction and damping, the seismic energy transmitted to the upper electrical equipment 16 is reduced. The greater the action amplitude of the shock-absorbing device 13, the greater the compression amount of the elastic component 8, the greater the pressure between the contact surfaces of each outer ring 6, and the stronger the friction shock-absorbing effect. After the earthquake stops, the restoring force of the elastic component 8 overcomes the friction force and pushes the friction component back to the initial position.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still modify or equivalently replace the specific implementation manners of the present invention. Any such modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of the claims of the present invention pending approval.

Claims

1. A friction damping shock absorber for electrical equipment, the electrical equipment being a pillar-type electrical equipment, the shock absorber being located between the electrical equipment and the equipment bracket, characterized in that, The device includes a cylinder body, a transmission shaft coaxially arranged with the cylinder body, upper and lower friction assemblies symmetrically and coaxially arranged, and a coaxial connecting rod located on one side of the inner wall of the cylinder body; The upper and lower friction assemblies are composed of an inner ring and an outer ring with conical surfaces in contact; An axial damper is provided between the upper and lower inner rings; Radial baffles and transmission connecting plates for connecting the transmission shaft and the connecting rod are respectively provided at the outer ends of the upper and lower friction assemblies; The cylinder body is provided with concave upper and lower end covers, and grooves for the baffles and the transmission connecting plates to move up and down are respectively provided in the concave parts of the upper and lower end covers; Coaxial through holes for the transmission shaft to pass through are provided on the upper end cover and the baffle; The inner ring is a single conical surface ring, and the outer ring is composed of at least two segmented rings; An axial through hole for the connecting rod to pass through is provided on each segmented ring; An elastic component coaxial with the transmission shaft is provided between the upper and lower friction assemblies; 2. The friction damping shock absorption device for electrical equipment according to claim 1, wherein, A washer is provided between the outer ring and the elastic component; 3. A friction damping shock absorption device for an electrical device according to claim 1, characterized in that, The connecting rod includes the following components by mass percentage: C 0.65%, Al 0.85%, Si 0.45%, Mo 0.25%, V 0.18%, Ti 0.15%, B 0.002%, Re 0.25%, Mg 0.25%, and the balance is Fe and impurities.

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