A conductive contact rod structure for disconnector and working method thereof

Abstract

The present invention discloses a conductive contact rod structure for an isolating switch and a working method thereof. The conductive contact rod structure for an isolating switch of the present invention is arranged at the top of the upper support arm of the clamp-type isolating switch, and includes an inner support tube and a contact tube. The root of the inner support tube is fixedly connected to the top of the upper support arm, and the contact tube is sleeved on the outside of the inner support tube. The cross-sectional outer contour of the contact tube is an equilateral polygon, and each side of the equilateral polygon corresponds to a side surface as a conductive outer wall. The conductive outer wall facing the static contact rod contacts the static contact rod when the switch is closed. The present invention adopts a contact tube with multiple conductive outer walls as an electrical contact rod. When repairing, the contact tube can be rotated to replace a new conductive outer wall to quickly achieve the effect of replacing a new moving contact piece.

Description

Technical Field

[0001] The invention relates to the technical field of isolating switches, and in particular to a conductive contact rod structure for isolating switches and a working method thereof. Background Art

[0002] As one of the important components of the power transmission and transformation system, the high-voltage disconnector is the most widely used primary equipment in the power grid. The disconnector must be in place when closed to ensure good contact between the contact fingers. When opening, there must be a clear air insulation distance visible to the naked eye to ensure the safety of maintenance personnel. The double-arm vertical telescopic high-voltage disconnector is a symmetrical scissor-type structure. After opening, a vertical insulation break is formed. Its opening and closing status is clear, which is convenient for inspection. As a busbar disconnector in the power distribution device, it has the advantage of small footprint, especially in the wiring of "double busbar with bypass", the land saving effect is most significant. The moving contact at the top of the upper arm of the double-arm vertical telescopic high-voltage disconnector clamps the static contact rod with a clamp-type clamp. The contact rod of the clamping part has a large range of lengths, and the static contact rod is suitable for hard busbars or soft busbars.

[0003] However, the moving contact, i.e., the electrical contact rod, of the existing clamp-type disconnectors often directly adopts an aluminum rod or an alloy aluminum rod integrally formed with the upper arm. If arc erosion occurs, it often needs to be replaced as a whole, which results in high operating costs. There are also some clamp-type disconnectors, such as the invention patent with publication number CN113611567A, which is an arc-starting device for a single-column, double-arm vertical telescopic disconnector. The moving contact piece is detachably mounted on the side of the conductive rod close to the static contact rod. When arc erosion occurs on the moving contact piece, the moving contact piece can be replaced to avoid replacing the entire conductive rod or disconnector. This has reduced operating costs to a certain extent. However, this type of separate replacement of the moving contact piece still requires spare parts, which increases the spare parts inventory, and the replacement process is more difficult, requiring high labor intensity for maintenance workers.

[0004] In order to overcome the above problems, a conductive contact rod structure for a disconnector and a working method thereof are needed. Summary of the invention

[0005] The purpose of the present invention is to provide a conductive contact rod structure for an isolating switch and a working method thereof, wherein a contact tube with multiple conductive outer walls is used as the electrical contact rod. During maintenance, the contact tube can be rotated to replace a new conductive outer wall to quickly replace a new moving contact piece.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] The present invention provides a conductive contact rod structure for an isolating switch, which is arranged at the top end of an upper support arm of a clamp-type isolating switch, and includes an inner support tube and a contact tube. The root of the inner support tube is fixedly connected to the top end of the upper support arm, and the contact tube is sleeved on the outside of the inner support tube; the outer contour of the cross section of the contact tube is an equilateral polygon, and each side of the equilateral polygon corresponds to a side surface as a conductive outer wall, and the conductive outer wall facing the static contact rod contacts the static contact rod when the switch is closed.

[0008] Furthermore, it also includes an arc-starting piece and a long bolt. The outer contour of the cross-section of the contact tube is a square. The four sides of the top of the contact tube are provided with through holes for the long bolts to pass through. The long bolts connect the contact tube and the plug-in plate at the bottom end of the arc-starting piece to the inner support tube.

[0009] Furthermore, the through hole of the contact tube that is not connected to the long bolt is installed with a plug for sealing.

[0010] Furthermore, it also includes a spring piece, the cross-sectional profile of the inner support tube is smaller than the inner wall profile of the contact tube, and a gap cavity is left between the inner side surface of the inner support tube and the side wall of the contact tube facing the stationary contact rod; the conductive spring piece is longitudinally arranged in the gap cavity to elastically support the contact tube to contact the side wall of the stationary contact rod.

[0011] Furthermore, the inner support tube has two symmetrical longitudinal grooves on the side wall facing the stationary contact rod, and accordingly, the number of the spring sheets is two; the root of the spring sheet is inserted into the groove through a pin, and the cantilever end of the spring sheet abuts against the inner side wall of the contact tube facing the stationary contact rod.

[0012] Furthermore, the slot is a T-slot or a dovetail slot, and the corresponding cross section of the pin is a T-head or a dovetail head; the spring sheet is a V-shaped folded plate or an arc-shaped plate structure.

[0013] Furthermore, it also includes a ventilation cooling mechanism, which performs air blowing cooling on the gap chamber.

[0014] Furthermore, the ventilation cooling mechanism includes an air source, an air inlet, an air inlet cavity, an air return cavity and an air exhaust hole. The two spring clips divide the gap cavity into three independent cavities along the longitudinal direction. The middle cavity is the air inlet cavity, and the cavities on both sides are the air return cavities. An air guide hole connecting the air inlet cavity and the air return cavity is provided on the top of the spring clip; a connecting seat connected to the inner support tube is provided on the top of the upper support arm, and the air inlet hole and the air exhaust hole are both provided on the top surface of the connecting seat, the air inlet hole is located on the bottom surface of the air inlet cavity, and the air exhaust hole is located on the bottom surface of the air return cavity; the air source provides clean and dry compressed air to the air inlet.

[0015] Furthermore, the air source specifically adopts an airbag, and the mounting plate of the airbag is fixedly connected to the bottom of the connecting seat. The two airbags are symmetrically mounted on the two upper arms respectively. During the closing process of the isolating switch body, the inward tail ends of the two airbags contact and squeeze to inflate air; an exhaust component and an air inlet pipe joint are provided on the side wall of the connecting seat, and the inner end of the exhaust component is connected to the exhaust hole through a pipe, and the inner end of the air inlet pipe joint is connected to the air inlet hole through a pipe; an air outlet and an air intake are provided on the airbag mounting plate, and the air outlet is connected to the air inlet pipe joint through a pipe.

[0016] The present invention also discloses a working method of a conductive contact rod structure for an isolating switch, using any one of the conductive contact rod structures for an isolating switch described above to contact the stationary contact rod to complete conduction, and replacing the contact point by converting the conductive outer wall of the contact tube.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are:

[0018] The conductive contact rod structure for disconnecting switches of the present invention is achieved by making the cross-sectional outer contour of the contact tube into an equilateral polygon, and each side of the equilateral polygon corresponds to a side surface as the conductive outer wall, so that each contact tube has multiple conductive outer walls. When arc erosion and wear occur at one conductive outer wall as a working contact, the other side can be used as a new working contact surface by rotating the contact tube. The replacement cycle of wearing parts is extended, the service life of the equipment is improved, and the operation of rotating the contact tube is simpler than that of disassembling and assembling the moving contact piece, which reduces the work intensity. The conductive contact rod structure for disconnecting switches of the present invention uses a contact tube with multiple conductive outer walls as an electrical contact rod. During maintenance, the contact tube can be rotated to replace a new conductive outer wall to quickly replace a new moving contact piece.

[0019] In addition, by adopting a square tube as the contact tube, it is easy to manufacture and obtain, and has a larger contact conductive area of ​​the conductive outer wall. By installing an arc-starting piece on the top of the contact tube, the top opening of the contact tube and the inner support tube can be closed to prevent rain, snow, sand and other debris from entering the tube. By providing a through hole for installing a long bolt on the top of each conductive outer wall, the contact tube can be installed after rotating. The addition of a plug can improve the sealing performance of the inner cavity to prevent debris from entering. The elastic support on the side wall of the static contact rod of the contact tube can buffer the contact impact of the contact tube and prevent the deformation of the contact tube. By adding a gap chamber as a heat dissipation space, the heat dissipation effect is improved. By providing two card slots and installing springs respectively, the contact conductive outer wall of the contact tube can be supported symmetrically and longitudinally at two locations, reducing local thermal deformation, preventing local depression, and improving the conductive efficiency. By adding the ventilation cooling mechanism, the gap chamber is blown and cooled inside the contact tube, and the contact tube is quickly cooled without disturbing and mixing with the outside air, which will not have an adverse effect on the arc and has good safety. By cleverly and reasonably using the springs as partitions between the air inlet cavity and the air return cavity, the gap cavity is divided into cavity ventilation channels, which can achieve high-speed passing of cooling air without dead angles and rapid cooling of the contact tube. By using the air bag as the air source of clean and dry compressed air, the two upper arms in the closing process squeeze the air bag to produce clean and dry compressed air, which avoids the need to provide additional power components such as air pumps, reduces equipment costs, shortens the air path, and reduces failures. By setting an air filter component on the air intake, dust removal and drying of the intake air can be achieved, improving the quality of the cooling gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the main structure of the isolating switch with the conductive contact rod structure of the present invention in Example 1;

[0022] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the middle A part;

[0023] Figure 3 This is a schematic diagram of the front view of the conductive contact rod structure of the present invention in Example 2;

[0024] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at position B in the middle;

[0025] Figure 5 This is a schematic diagram of the front view of the conductive contact rod structure of Example 3 of the present invention;

[0026] Figure 6 for Figure 5Schematic diagram of the cross-sectional structure at the middle C position;

[0027] Figure 7 This is a partial enlarged structural schematic diagram of the airbag installation location in Example 3.

[0028] Explanation of the reference numerals in the accompanying drawings: 1. isolating switch body; 2. upper support arm; 201. connecting seat; 2011. exhaust member; 2012. air inlet pipe joint; 3. inner support tube; 301. slot; 4. arc-starting member; 401. plug plate; 5. long bolt; 6. contact tube; 7. plug; 8. spring piece; 801. plug pin; 802. air guide hole; 9. air inlet hole; 10. exhaust hole; 11. air inlet chamber; 12. air return chamber; 13. air bag; 1301. air outlet; 1302. air intake; 14. static contact rod. DETAILED DESCRIPTION

[0029] The core of the present invention is to provide a conductive contact rod structure for an isolating switch and a working method thereof, wherein a contact tube with multiple conductive outer walls is used as the electrical contact rod. During maintenance, the contact tube can be rotated to replace a new conductive outer wall to quickly replace a new moving contact piece.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] With reference to the accompanying drawings, Figure 1 This is a schematic diagram of the main structure of the isolating switch with the conductive contact rod structure of the present invention in Example 1; Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the middle A part; Figure 3 This is a schematic diagram of the front view of the conductive contact rod structure of the present invention in Example 2; Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at position B in the middle; Figure 5 This is a schematic diagram of the front view of the conductive contact rod structure of Example 3 of the present invention; Figure 6 for Figure 2Schematic diagram of the cross-sectional structure at the middle C position; Figure 7 This is a partial enlarged structural schematic diagram of the airbag installation location in Example 3.

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, a double-arm vertical telescopic high-voltage disconnector is used as an example for explanation. The top of the disconnector body 1 includes two upper arms 2 that can be symmetrically approached and moved away. The conductive contact rod structure for the disconnector of the present invention is installed at the top of the upper arm 2 of the clamp-type disconnector, including an inner support tube 3 and a contact tube 6. The root of the inner support tube 3 is fixedly connected to the top of the upper arm 2. The inner support tube 3 can be integrally formed with the upper arm 2 or can be connected by plugging or bolting. The contact tube 6 is sleeved on the outside of the inner support tube 3, and the two are tightly sleeved to ensure good mechanical connection strength and conductive performance. The cross-sectional outer contour of the contact tube 6 is an equilateral polygon, and each side of the equilateral polygon corresponds to a side surface as a conductive outer wall. The conductive outer wall facing the static contact rod 14 contacts the static contact rod 14 when the switch is closed. The cross-sectional outer contour of the inner support tube 3 is consistent with the inner hole of the contact tube 6, and can prevent the contact tube 6 from rotating freely in the circumferential direction.

[0035] Specifically, the upper support arm 2 and the inner support tube 3 are both made of high-strength aluminum alloy material, and the contact tube 6 is an aluminum alloy tube or a copper alloy tube, both of which have good electrical conductivity.

[0036] By making the cross-sectional outer contour of the contact tube 6 into an equilateral polygon, each side of the equilateral polygon corresponds to a side surface as the conductive outer wall, so that each contact tube 6 has multiple conductive outer walls, when one conductive outer wall as a working contact is subjected to arc erosion and wear, the other side can be used as a new working contact surface by rotating the contact tube 6. The replacement cycle of wearing parts is extended, the service life of the equipment is improved, and the operation of rotating the contact tube 6 is simpler than that of disassembling and assembling the moving contact piece, and the work intensity is reduced. The conductive contact rod structure for the isolating switch of the present invention uses a contact tube with multiple conductive outer walls as the electrical contact rod. When repairing, the contact tube can be rotated to replace a new conductive outer wall to quickly replace a new moving contact piece.

[0037] In a specific implementation of this embodiment, Figure 1 and Figure 2As shown, the conductive contact rod structure for the disconnector of the present invention also includes an arc-starting piece 4 and a long bolt 5. The cross-sectional outer contour of the contact tube 6 is a square. The four sides of the top of the contact tube 6 are provided with through holes for the long bolt 5 to pass through. The long bolt 5 connects the contact tube 6 and the plug-in board 401 at the bottom of the arc-starting piece 4 to the inner support tube 3. The long bolt 5 is locked with a locking nut to prevent it from falling off during repeated opening and closing operations. The arc-starting piece 4 includes two independent parts respectively installed on the top of the two inner support tubes 3, which can play a role in reducing the impact of the arc, which is consistent with the arc-starting device in the prior art.

[0038] Specifically, if Figure 1 and Figure 2 As shown, the through hole of the contact tube 6 not connected with the long bolt 5 is installed with a plug 7 for sealing. The plug 7 can be pressed into the through hole of the contact tube 6 by a slight interference fit, and when disassembling, it can be pushed out from the inside of the contact tube 6 using a screwdriver. The plug 7 can be made of stainless steel or a rubber material with good high temperature resistance and weather resistance.

[0039] By using a square tube as the contact tube 6, it is easy to manufacture and obtain, and has a larger conductive area of ​​the conductive outer wall in contact with the conductive tube. By installing an arc-starting piece 4 on the top of the contact tube 6, the top openings of the contact tube 6 and the inner support tube 3 can be sealed to prevent rain, snow, sand and other debris from entering the tube. By providing a through hole for installing a long bolt 5 on the top of each conductive outer wall, the contact tube 6 can be installed after rotating it, and the addition of a plug 7 can improve the sealing performance of the inner cavity to prevent debris from entering.

[0040] The process of replacing the new working contacts of the conductive contact rod structure for the disconnector in this embodiment is as follows: the disconnector body 1 is in the open state, and the contact tube 6 is away from the static contact rod 14. The operator wears protective equipment, uses a wrench to remove the anti-loosening nut of the long bolt 5, removes the arc-starting piece 4, and pulls the contact tube 6 out of the inner support tube 3. Use a screwdriver to push out the plug 7 from the inside of the contact tube 6, and keep the plug 7. Rotate the contact tube 6 at a right angle so that the new conductive outer wall faces the static contact rod 14 as a moving contact. Reinsert the plug board 401 into the inner support tube 3, reinstall the long bolt 5 and lock it with the anti-loosening nut. Press the plug 7 back into the unused contact tube 6 through hole.

[0041] Example 2

[0042] On the basis of the above-mentioned embodiment 1, an elastic support mechanism of the contact tube 6 is added to improve the conductive contact effect of the contact tube 6. Figure 3 and Figure 4As shown, the conductive contact rod structure for the disconnector of the present invention further includes a spring piece 8, the cross-sectional profile of the inner support tube 3 is smaller than the inner wall profile of the contact tube 6, and a gap cavity is left between the inner side surface of the inner support tube 3 and the side wall of the contact tube 6 facing the static contact rod 14. The cross-sectional width of the inner support tube 3 matches the inner hole size of the contact tube 6 and can slide relatively. The conductive spring piece 8 is longitudinally arranged in the gap cavity, and the spring piece 8 elastically supports the side wall of the contact tube 6 contacting the static contact rod 14. The spring piece 8 is made of a copper alloy material with good elasticity.

[0043] The elastic sheet 8 is elastically supported on the side wall of the contact tube 6 contacting the stationary contact rod 14, so as to buffer the contact impact of the contact tube 6 and avoid deformation of the contact tube 6. By adding the gap chamber as the heat dissipation space, the heat dissipation effect is improved.

[0044] In a specific implementation of this embodiment, Figure 4 As shown, two slots 301 are symmetrically longitudinally opened on the side wall of the inner support tube 3 facing the stationary contact rod 14, and correspondingly, there are two spring pieces 8. The root of the spring piece 8 is inserted into the slot 301 through the pin 801, and the cantilever end of the spring piece 8 abuts against the inner side wall of the contact tube 6 facing the stationary contact rod 14.

[0045] Specifically, if Figure 4 As shown, the slot 301 is a T-slot or a dovetail slot, and the corresponding cross section of the pin 801 is a T-head or a dovetail head. The spring piece 8 is a V-shaped folded plate or an arc plate structure.

[0046] By providing two slots 301 and installing spring pieces 8 respectively, the contact conductive outer wall of the contact tube 6 can be supported symmetrically and longitudinally at two locations, thereby reducing local thermal deformation, preventing local depression, and improving the conductive efficiency.

[0047] Example 3

[0048] On the basis of the above-mentioned embodiment 2, an air cooling mechanism is added to improve the heating of the contact tube 6 during the contact with the stationary contact rod 14, and the contact tube 6 is quickly cooled internally to ensure its conductive effect. Figures 5 to 7 As shown, the ventilation cooling mechanism performs air blowing cooling on the gap chamber.

[0049] By adding the ventilation cooling mechanism, air is blown to cool the gap chamber inside the contact tube 6, and the contact tube 6 is quickly cooled without disturbing and mixing with the outside air, which will not have an adverse effect on the arc and has good safety.

[0050] In a specific implementation of this embodiment, Figure 5 and Figure 6As shown, the ventilation cooling mechanism includes an air source, an air inlet hole 9, an air inlet cavity 11, an air return cavity 12 and an air exhaust hole 10. Two spring clips 8 divide the gap cavity into three independent chambers in the longitudinal direction. The middle cavity is the air inlet cavity 11, and the two side cavities are both air return cavities 12. An air guide hole 802 connecting the air inlet cavity 11 and the air return cavity 12 is provided on the top of the spring clip 8. Specifically, the groove of the spring clip 8 of the V-shaped folding plate faces the middle, so that the cross-sectional area of ​​the air inlet cavity 11 is roughly equal to the cross-sectional area of ​​the two air return cavities 12. A connecting seat 201 connected to the inner support tube 3 is provided at the top of the upper arm 2. The air inlet hole 9 and the air exhaust hole 10 are both provided on the top surface of the connecting seat 201. The air inlet hole 9 is located on the bottom surface of the air inlet cavity 11, and the air exhaust hole 10 is located on the bottom surface of the air return cavity 12. The air source provides clean and dry compressed air to the air inlet hole 9.

[0051] By cleverly and reasonably utilizing the spring sheet 8 as a partition between the air inlet cavity 11 and the air return cavity 12 , the gap cavity is divided into cavity ventilation channels, so that high-speed passing of cooling air without dead angles can be achieved, thereby rapidly cooling the contact tube 6 .

[0052] Specifically, the air source specifically adopts an airbag 13, the mounting plate of the airbag 13 is fixedly connected to the bottom of the connecting seat 201, and the two airbags 13 are symmetrically mounted on the two upper arms 2, respectively, and a return spring is arranged inside the airbag 13. During the closing process of the isolating switch body 1, the inwardly facing tail ends of the two airbags 13 contact and squeeze out compressed air. An exhaust member 2011 and an air inlet pipe joint 2012 are arranged on the side wall of the connecting seat 201, the inner end of the exhaust member 2011 is connected to the exhaust hole 10 through a pipeline, and the inner end of the air inlet pipe joint 2012 is connected to the air inlet hole 9 through a pipeline. A filter is installed on the exhaust hole 10. An air outlet 1301 and an air inlet 1302 are arranged on the mounting plate of the airbag 13, and the air outlet 1301 is connected to the air inlet pipe joint 2012 through a pipeline.

[0053] Obviously, the gas source can also be a separate gas pump or an additional gas cylinder, which supplies dry compressed nitrogen or other inert gas, to achieve better cooling and safe operation effects. Similar simple variations fall within the scope of protection of the present invention.

[0054] Specifically, a one-way valve and an air filter assembly are provided on the air intake port 1302. Through the setting of the one-way valve, during the opening process, the tail ends of the two airbags 13 are gradually separated, and the airbags 13 expand under the resetting action of the internal spring. The one-way valve of the air intake port 1302 opens to complete the air intake. The air filter assembly includes a filter plate and a desiccant layer, which can filter, remove dust and dry the incoming air.

[0055] By using the air bag 13 as the air source of clean and dry compressed air, the two upper arms 2 are used to squeeze the air bag 13 to produce clean and dry compressed air during the closing process, avoiding the need for additional power components such as air pumps, reducing equipment costs, shortening the air path, and reducing failures. By arranging an air filter component on the air intake 1302, dust removal and drying of the intake air can be achieved, thereby improving the quality of the cooling gas.

[0056] The cooling process of the conductive contact rod structure for the disconnector in this embodiment: During the closing process of the disconnector body 1, the two upper arms 2 are driven to approach each other, and the contact tube 6 gradually contacts the static contact rod 14, which will cause heat to occur. At the same time, the upper arms 2 approaching each other will also cause the tails of the two air bags 13 to contact and squeeze each other, producing clean and dry compressed air. The clean and dry compressed air enters the gap chamber through the air outlet 1301, the air inlet pipe joint 2012 and the air inlet hole 9 in sequence. The compressed air in the gap chamber flows along the middle air inlet cavity 11, the top air guide hole 802 and the return air cavity 12 on both sides to cool the inner wall of the contact tube 6 in a return-type, dead-angle-free flow. Finally, it is discharged through the exhaust hole 10 and the exhaust part 2011. The whole process will not cause external air disturbance in the conductive contact area, and the operation safety is good. During the opening process, the upper arms 2 separate from each other, and the tail ends of the two air bags 13 also gradually separate. The air bags 13 expand under the reset action of the internal spring, and the one-way valve of the air intake port 1302 opens to complete the air intake, preparing for the next cooling air blow.

[0057] It should be noted that the above embodiments and their drawings are all described with reference to a double-arm vertical telescopic high-voltage disconnector. In fact, the present invention is also applicable to a single-arm telescopic disconnector. As long as the disconnector adopts a clamp-type contact conductive, it falls within the protection scope of the present invention, and the above embodiments and their drawings shall not be regarded as limiting the present invention.

[0058] In summary, the conductive contact rod structure for disconnector of the present invention makes the cross-sectional outer contour of the contact tube 6 into an equilateral polygon, and each side of the equilateral polygon corresponds to a side surface as the conductive outer wall, so that each contact tube 6 has multiple conductive outer walls. When one conductive outer wall as a working contact is subjected to arc erosion and wear, the other side can be used as a new working contact surface by rotating the contact tube 6. The replacement cycle of wearing parts is extended, the service life of the equipment is improved, and the operation of rotating the contact tube 6 is simpler than that of disassembling and assembling the moving contact piece, and the work intensity is reduced. The conductive contact rod structure for disconnector of the present invention uses a contact tube with multiple conductive outer walls as an electric contact rod. When repairing, the contact tube can be rotated to replace a new conductive outer wall to quickly replace a new moving contact piece. In addition, by using a square tube for the contact tube 6, it is easy to manufacture and obtain, and has a larger contact conductive area of ​​the conductive outer wall. By installing the arc-starting member 4 on the top of the contact tube 6, the top openings of the contact tube 6 and the inner support tube 3 can also be closed to prevent rain, snow, sand and other debris from entering the tube. By providing a through hole for installing a long bolt 5 at the top of each of the conductive outer walls, the contact tube 6 can be installed after being rotated, and the addition of a plug 7 can improve the sealing performance of the inner cavity and prevent debris from entering. The spring sheet 8 elastically supports the side wall of the contact tube 6 contacting the static contact rod 14, which can buffer the contact impact of the contact tube 6 and prevent the contact tube 6 from deforming. By adding a gap chamber as a heat dissipation space, the heat dissipation effect is improved. By providing two card slots 301 and installing spring sheets 8 respectively, the contact conductive outer wall of the contact tube 6 can be supported symmetrically and longitudinally at two locations, reducing local thermal deformation, preventing local depression, and improving the conductive efficiency. By adding the ventilation cooling mechanism to blow air into the gap chamber inside the contact tube 6, the contact tube 6 is quickly cooled without disturbing and mixing with the outside air, which will not have an adverse effect on the arc and has good safety. By cleverly and reasonably using the spring sheet 8 as a partition between the air inlet chamber 11 and the air return chamber 12, the gap chamber is divided into chamber ventilation channels, which can achieve high-speed passing of cooling air without dead angles and quickly cool the contact tube 6. By using the air bag 13 as the air source of clean and dry compressed air, the two upper arms 2 in the closing process squeeze the air bag 13 to produce clean and dry compressed air, avoiding the need to provide additional power components such as air pumps, reducing equipment costs, shortening the air path, and reducing failures. By setting an air filter component on the air intake 1302, dust removal and drying of the intake air can be achieved, improving the quality of the cooling gas.

[0059] The present invention also discloses a working method of a conductive contact rod structure for an isolating switch, using any one of the above embodiments to contact the stationary contact rod 14 to complete conduction, and replacing the contact point by converting the conductive outer wall of the contact tube 6.

[0060] By changing the conductive outer wall of the contact tube 6 and replacing the movable contact of the static contact rod 14, the use efficiency of the contact tube 6 can be improved, the maintenance time can be reduced, and the service life of the disconnector can be increased.

[0061] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0062] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A conductive contact rod structure for an isolating switch, arranged at the top of an upper arm (2) of a clamp-type isolating switch, characterized in that: It comprises an inner support tube (3) and a contact tube (6), wherein the root of the inner support tube (3) is fixedly connected to the top of the upper support arm (2), and the contact tube (6) is sleeved on the outside of the inner support tube (3); the outer contour of the cross section of the contact tube (6) is an equilateral polygon, each side of the equilateral polygon corresponds to a side surface as a conductive outer wall, and the conductive outer wall facing the static contact rod (14) contacts the static contact rod (14) when the switch is closed; It also includes a spring sheet (8), the cross-sectional profile of the inner support tube (3) is smaller than the inner wall profile of the contact tube (6), and a gap cavity is left between the inner side surface of the inner support tube (3) and the side wall of the contact tube (6) facing the stationary contact rod (14); the spring sheet (8) capable of conducting electricity is longitudinally arranged in the gap cavity to elastically support the contact tube (6) in contact with the side wall of the stationary contact rod (14).

2. The conductive contact rod structure for the isolating switch according to claim 1, characterized in that: It also includes an arc-starting piece (4) and a long bolt (5); the cross-sectional outer contour of the contact tube (6) is a square; four side surfaces of the top end of the contact tube (6) are provided with through holes through which the long bolt (5) passes; the long bolt (5) connects the contact tube (6) and the plug-in board (401) at the bottom end of the arc-starting piece (4) to the inner support tube (3).

3. The conductive contact rod structure for the isolating switch according to claim 2, characterized in that: The through hole of the contact tube (6) not connected to the long bolt (5) is installed with a plug (7) for sealing.

4. The conductive contact rod structure for the isolating switch according to claim 1, characterized in that: The inner support tube (3) has two longitudinally symmetrical slots (301) on the side wall facing the stationary contact rod (14), and correspondingly, the number of the spring sheets (8) is two; the root of the spring sheet (8) is inserted into the slot (301) through a pin (801), and the cantilever end of the spring sheet (8) abuts against the inner side wall of the contact tube (6) facing the stationary contact rod (14).

5. The conductive contact rod structure for the isolating switch according to claim 4, characterized in that: The slot (301) is a T-slot or a dovetail slot, and the corresponding cross section of the plug pin (801) is a T-head or a dovetail head; the spring sheet (8) is a V-shaped folded plate or an arc-shaped plate structure.

6. The conductive contact rod structure for the disconnector according to claim 4 or 5, characterized in that: It also includes an air-vent cooling mechanism, which performs air-blow cooling on the gap chamber.

7. The conductive contact rod structure for the disconnector according to claim 6, characterized in that: The ventilation cooling mechanism comprises an air source, an air inlet hole (9), an air inlet cavity (11), an air return cavity (12) and an air exhaust hole (10); the two spring sheets (8) divide the gap cavity into three independent cavities along the longitudinal direction, the middle cavity is the air inlet cavity (11), and the cavities on both sides are the air return cavities (12); an air guide hole (802) connecting the air inlet cavity (11) and the air return cavity (12) is provided on the top of the spring sheet (8); a connecting seat (201) connected to the inner support tube (3) is provided at the top of the upper support arm (2); the air inlet hole (9) and the air exhaust hole (10) are both provided on the top surface of the connecting seat (201); the air inlet hole (9) is located on the bottom surface of the air inlet cavity (11), and the air exhaust hole (10) is located on the bottom surface of the air return cavity (12); the air source provides clean and dry compressed air to the air inlet hole (9).

8. The conductive contact rod structure for the disconnector according to claim 7, characterized in that: The air source specifically adopts an airbag (13), the mounting plate of the airbag (13) is fixedly connected to the bottom of the connecting seat (201), and the two airbags (13) are symmetrically mounted on the two upper arms (2), respectively. During the closing process of the isolating switch body (1), the inwardly facing tail ends of the two airbags (13) contact and squeeze to inflate air; an exhaust member (2011) and an air inlet pipe joint (2012) are arranged on the side wall of the connecting seat (201), the inner end of the exhaust member (2011) is connected to the exhaust hole (10) through a pipeline, and the inner end of the air inlet pipe joint (2012) is connected to the air inlet hole (9) through a pipeline; an air outlet (1301) and an air intake (1302) are arranged on the mounting plate of the airbag (13), and the air outlet (1301) is connected to the air inlet pipe joint (2012) through a pipeline.

9. A method for operating a conductive contact rod structure for an isolating switch, characterized in that: The conductive contact rod structure for the isolating switch according to any one of claims 1 to 8 is used to contact the stationary contact rod (14) to complete conduction, and the contact point is replaced by changing the conductive outer wall of the contact tube (6).

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