An isolating switch terminal block assembly and its working method

Abstract

The present invention discloses a disconnecting switch terminal block assembly and its working method. The disconnecting switch terminal block assembly of the present invention includes: a main terminal block housing, with legs provided at the bottom of the main terminal block housing, and two connecting arms protruding in parallel from one side wall of the main terminal block housing, and the two connecting arms are connected to a conductive arm; a main shaft member, the main shaft member is vertically and rotatably installed at the middle position of the main terminal block housing, and the top of the main shaft member protrudes out of the main terminal block housing and is connected with a primary wiring board for connecting a primary main line; a copper strip passing groove is radially provided at the middle part of the main shaft member inside the cavity of the main terminal block housing, and a second threaded hole is provided perpendicular to the copper strip passing groove, and a tightening set screw is arranged in the second threaded hole; a conductive copper strip, the conductive copper strip passes through the copper strip passing groove and is pressed by the tightening set screw at the middle position, and both ends of the conductive copper strip are respectively crimped on the outer wall of the conductive arm by the connecting arms. In the present invention, the flexible connection adopts a whole conductive copper strip and the ends are fixed by a pressing method, reducing the risk of copper strip fracture.

Description

Technical Field

[0001] The present invention relates to the technical field of disconnecting switches, and particularly to a disconnecting switch terminal block assembly and its working method. Background Art

[0002] As an important component of the power transmission and transformation system, the high-voltage disconnecting switch is one of the primary equipment with the largest usage in the power grid. The disconnecting switch must be closed in place to ensure good contact between the contact fingers of the contacts. When opened, there must be a clearly visible air insulation distance with the naked eye to ensure the safety of maintenance personnel. The double-column horizontal rotary high-voltage disconnecting switch is a double-column three-phase AC 50Hz outdoor high-voltage switchgear, mainly used in power systems with voltages of 10 - 220kV. Its main functions include opening and closing the circuit without load voltage, and electrically isolating the high-voltage busbars, circuit breakers and other electrical equipment to be repaired from the energized high-voltage lines. Each single stage of the double-column horizontal rotary high-voltage disconnecting switch consists of a base, a post insulator, a terminal block, a conductive arm, contacts, etc., and is equipped with a rotating part. Among them, the terminal block plays a role in connecting the primary main line and the conductive arm. Using the rotational sliding fit conduction method between the conductive shaft and the conductive arm, electrical corrosion and failure are likely to occur. Now, flexible copper strips for soft connection are increasingly used to achieve flexible conduction.

[0003] However, the existing soft connection conductive copper strips are often provided with two. One end of each conductive copper strip is bolt-connected to the conductive shaft of the primary wiring board, and the other end is screwed to the conductive arm, with a rotational allowance left in the middle. Because both ends are bolt-connected, through holes for bolt penetration need to be opened on the conductive copper strip. Therefore, during long-term use, as the disconnecting switch reciprocates between opening and closing, and the primary line is blown by the wind, the conductive copper strip will be repeatedly unfolded and bent. This high-frequency bending, combined with the long-term influence of the harsh outdoor environment, is most likely to cause fractures at the microcracks of the drilled holes, thereby leading to equipment failure. For example, in the patent documents with publication numbers CN213752503U and CN202134446U, both adopt this two-stage bolt-connected soft connection method, where the conductive copper strip is prone to fracture, increasing the maintenance cost.

[0004] In order to overcome the above problems, a disconnecting switch terminal block assembly and its working method are needed. Summary of the Invention

[0005] The purpose of the present invention is to provide a disconnecting switch terminal block assembly and its working method, where the soft connection uses an integral conductive copper strip and the ends are fixed by pressing, reducing the risk of copper strip fracture.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An isolating switch terminal block assembly of the present invention is arranged at the top of a single-stage insulator of a double-column horizontally rotatable high-voltage isolating switch and is used to connect a primary main line and a conductive arm. It is characterized in that it includes:

[0008] A main terminal block housing, legs for connecting the insulator are arranged at the bottom of the main terminal block housing, and two connecting arms protrude in parallel from one side wall of the main terminal block housing. The two connecting arms are connected to the outer wall of the conductive arm by bolts;

[0009] A main shaft member, the main shaft member is vertically and rotatably installed at the middle position of the main terminal block housing. The top of the main shaft member protrudes out of the main terminal block housing and is connected with a primary wiring board for connecting the primary main line; a copper strip passing groove is radially opened at the middle part of the main shaft member in the cavity of the main terminal block housing, and a second threaded hole is arranged perpendicular to the copper strip passing groove, and a tightening set screw is arranged in the second threaded hole;

[0010] A conductive copper strip, the conductive copper strip passes through the copper strip passing groove and is pressed in the middle position by the tightening set screw. The two ends of the conductive copper strip are respectively pressed by the connecting arms on two opposite outer walls of the end of the conductive arm.

[0011] Furthermore, it further includes a backing plate. A backing plate passing groove with an increased height is also arranged on one side of the copper strip passing groove. The backing plate is inserted into the backing plate passing groove, and the two second threaded holes are respectively arranged at the upper and lower ends of the backing plate passing groove; the two tightening set screws press against the backing plate, and the backing plate presses the conductive copper strip against the opposite side wall.

[0012] Furthermore, it further includes a limiting member. A third threaded hole is opened at the middle position of the side wall of the copper strip passing groove opposite to the second threaded hole. The limiting member is threadedly connected to the third threaded hole, and a core rod that elastically ejects is coaxially arranged in the middle of the limiting member; a central through hole is opened at the middle position of the backing plate, and a positioning pit is opened on the side wall of the backing plate passing groove at the position of the central through hole. The inner end of the core rod passes through the central through hole and enters the positioning pit.

[0013] Furthermore, the outer end of the core rod protrudes out of the housing of the limiting member and can be ejected outwards, and a limiting structure cooperating with the outer end of the core rod is arranged on the left inner side wall of the main terminal block housing.

[0014] Furthermore, the limiting structure includes a limiting slider and a guide rail member. The guide rail member is horizontally arranged on the left inner side wall of the main terminal block housing. The limiting slider slides along the guide of the guide rail member and can lock its position. The limiting slider limits the outer end of the core rod.

[0015] Further, the guide rail member adopts a track groove integrally formed with the main housing of the terminal block. The inner cross-section of the track groove is a T-shaped profile, and correspondingly, the limit slider is a T-shaped block. A fourth threaded hole is provided at the middle position of the limit slider, and a positioning set screw is threadedly connected in the fourth threaded hole. The positioning set screw can lock the limit slider in the track groove.

[0016] Further, the front and rear end faces of the main housing of the terminal block are open and detachably connected with end covers.

[0017] Further, upper and middle holes and lower and middle holes are respectively provided at the middle positions of the top plate and the bottom plate of the main housing of the terminal block. An upper shaft sleeve and a lower shaft sleeve are respectively arranged in the upper and middle holes and the lower and middle holes. The upper shaft sleeve and the lower shaft sleeve rotatably support the main shaft member. The upper shaft sleeve and the lower shaft sleeve are made of a composite material of polytetrafluoroethylene and graphite.

[0018] Further, a sealing groove arranged in a C-shaped layout is provided on the inner side wall of the connecting arm at the periphery of the crimping area of the conductive copper strip, and a sealing ring is installed in the sealing groove.

[0019] The present invention also discloses a working method of a disconnector terminal block assembly. The disconnector terminal block assembly described in any one of the above is used to connect the primary main line and the conductive arm. A whole conductive copper strip is adopted and the connection positions are all connected in a pressing manner.

[0020] Compared with the prior art, the beneficial technical effects of the present invention are:

[0021] For the disconnector terminal block assembly of the present invention, by providing a complete conductive copper strip as the soft connection core component inside the terminal block, the hidden defects caused by mechanical cutting are reduced; by pressing the middle position of the conductive copper strip in the copper strip passing groove to connect with the main shaft member, and pressing the two ends on the outer wall of the end of the conductive arm to connect the conductive arm, mechanical processing through holes are avoided throughout the whole length. And compared with the bolt pressing method, the pressing method of surface-to-surface contact has good electrical conductivity and avoids local overheating. By providing bolts on the connecting arm to detachably connect the conductive arm, and by providing bolts on the primary wiring board to detachably connect the wire clamp of the primary main line, as long as the interface dimensions are kept consistent, the interchangeability of each accessory can be guaranteed, and the versatility of the equipment is improved. For the disconnector terminal block assembly of the present invention, the soft connection adopts a whole conductive copper strip and the end is fixed by a pressing method, reducing the risk of copper strip fracture.

[0022] In addition, by adding a pad groove and a pad, when pressing the conductive copper strip, the extrusion damage of the inner end of the tightening set screw to the conductive copper strip can be reduced. At the same time, good large-area conductive contact can be achieved on both sides of the pressed part in the middle of the conductive copper strip, improving the current-carrying performance. Through the setting of the detachable limiting part, the core rod of the limiting part passes through the central through hole of the pad and enters the positioning pit, which plays a role in positioning and preventing the pad from falling off during the transportation, maintenance and replacement of the accessories, avoiding the loss of the pad. By the outer end of the core rod being pushed out only when the conductive copper strip is installed and then contacting the limiting structure, it is ensured that the limiting structure can play a limiting role to protect the conductive copper strip only after the conductive copper strip is connected to the main shaft part. Through the setting of the track groove and the limiting slider, the limiting slider slides along the track groove to guide and adjust the front and rear positions, and the position where the limiting slider presses against the outer end of the core rod can be realized, that is, the pre-tightening rotation angle of the main shaft part is adjusted, so that the primary main line will not swing under the action of normal wind force, and the slight rotation of the main shaft part is also avoided. Through the setting of the detachable end cover, it is convenient for later maintenance and repair, and it is convenient to adjust the limiting slider. By adding an upper shaft sleeve and a lower shaft sleeve between the main housing of the terminal block and the main shaft part, and the two are made of specific composite materials, it not only ensures the flexible rotation of this rotating part, but also effectively avoids the rust phenomenon. By opening a sealing groove on the inner side wall of the connecting arm to surround the crimping area of the conductive copper strip on three sides and installing the sealing ring, the direct contact between the conductive copper strip and the external environment can be reduced, avoiding rust caused by rainwater and improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the drawings.

[0024] Figure 1 is a three-dimensional structural schematic diagram of the disconnecting switch terminal block assembly of the present invention;

[0025] Figure 2 is a front view sectional structural schematic diagram of the disconnecting switch terminal block assembly of the present invention;

[0026] Figure 3 is a right view structural schematic diagram of the disconnecting switch terminal block assembly of the present invention;

[0027] Figure 4 is a three-dimensional structural schematic diagram of the main housing of the terminal block of the present invention;

[0028] Figure 5 is a three-dimensional structural schematic diagram of the main shaft part of the present invention;

[0029] Figure 6 is a front view sectional structural schematic diagram of the limiting part of the present invention;

[0030] Figure 7 is a top view sectional structural schematic diagram of the disconnecting switch terminal block assembly of the present invention in the use state.

[0031] Description of reference numerals: 1, main housing of the terminal block; 101, leg; 102, connecting arm; 103, upper middle hole; 104, lower middle hole; 105, first bolt through-hole; 106, sealing groove; 107, track groove; 108, first threaded hole; 2, main shaft member; 201, primary wiring board; 202, second bolt through-hole; 203, copper strip passing groove; 204, gasket passing groove; 205, second threaded hole; 206, snap ring groove; 207, positioning pit; 208, third threaded hole; 3, upper shaft sleeve; 4, lower shaft sleeve; 5, backing plate; 6, conductive copper strip; 7, limiting member; 701, core rod; 702, external threaded section; 703, fastening nut; 704, compression spring; 8, limiting slider; 801, fourth threaded hole; 9, positioning set screw; 10, pressing set screw; 11, sealing strip; 12, end cover; 13, conductive arm. Detailed implementation manners

[0032] The core of the present invention is to provide a disconnecting switch terminal block assembly and its working method. The flexible connection uses an integral conductive copper strip and the end is fixed by a pressing method, reducing the risk of copper strip breakage.

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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 should not be construed as a limitation of the present invention.

[0035] Referring to the accompanying drawings, Figure 1 is a three-dimensional structural schematic diagram of the disconnecting switch terminal block assembly of the present invention; Figure 2 is a front sectional structural schematic diagram of the disconnecting switch terminal block assembly of the present invention; Figure 3 is a right view structural schematic diagram of the disconnecting switch terminal block assembly of the present invention; Figure 4 is a three-dimensional structural schematic diagram of the main housing of the terminal block of the present invention;

[0036] Figure 5 is a three-dimensional structural schematic diagram of the main shaft member of the present invention; Figure 6 is a front sectional structural schematic diagram of the limiting member of the present invention; Figure 7This is a schematic top-down sectional view of the disconnecting switch terminal block assembly of the present invention in the operating state.

[0037] In a specific embodiment, as Figures 1 to 7 shown, the disconnecting switch terminal block assembly of the present invention is arranged at the top of the cylindrical insulator of a single-stage switch of a double-column horizontal rotary high-voltage disconnecting switch and is used to connect the primary main line and the conductive arm 13, and includes:

[0038] The main terminal block housing 1, the main body of the main terminal block housing 1 is a square tube structure and is integrally die-cast with all-aluminum, having the advantages of light weight and high structural strength. A leg 101 for connecting the insulator is provided at the bottom of the main terminal block housing 1. The leg 101 has a cross-sectional L-shaped structure, and bolt through-holes for connecting the top part of the insulator are provided on the bottom plate of the leg 101. The right side wall of the main terminal block housing 1 is open and two connecting arms 102 protrude parallel at the edge position. First bolt through-holes 105 are provided on the two connecting arms 102 and are connected to the outer wall of the conductive arm 13 by bolts. A plurality of first bolt through-holes 105 are arranged in two upper and lower rows to connect the conductive arm 13.

[0039] The main shaft member 2, the shaft part of the main shaft member 2 is vertically and rotatably installed at the middle position of the main terminal block housing 1. The top of the main shaft member 2 protrudes out of the main terminal block housing 1 and is connected with a primary wiring board 201 for connecting the primary main line. Second bolt through-holes 202 are provided on the primary wiring board 201, and the second bolt through-holes 202 pass through bolts to connect the wire clamp of the primary main line. A copper strip through-groove 203 is radially provided at the middle part of the main shaft member 2 inside the cavity of the main terminal block housing 1, and the copper strip through-groove 203 is provided in a continuous length. A second threaded hole 205 perpendicular to the copper strip through-groove 203 is provided on the side wall of the copper strip through-groove 203, and a tightening set screw 10 is threadedly connected in the second threaded hole 205.

[0040] The conductive copper strip 6, as the core component of the flexible connection, there is only one and it is not machined by drilling. The conductive copper strip 6 passes through the copper strip through-groove 203 and is pressed by the tightening set screw 10 at the middle position. The two ends of the conductive copper strip 6 are respectively pressed by the connecting arms 102 on two opposite outer walls at the end of the conductive arm 13. It is necessary to reserve the allowance of the conductive copper strip 6 inside the cavity of the main terminal block housing 1 to meet the requirement that the main terminal block housing 1 rotates 90 degrees relative to the main shaft member 2.

[0041] By setting a complete conductive copper strip 6 as the core component of the flexible connection inside the terminal block, the hidden defects caused by mechanical cutting are reduced; by pressing the middle position of the conductive copper strip 6 into the copper strip through-groove 203 to connect with the main shaft part 2, and by crimping both ends onto the outer wall of the end of the conductive arm 13 to connect the conductive arm 13, mechanical processing of through-holes is avoided throughout the entire length. And compared with the bolt pressing method, the pressing method of surface-to-surface contact has good electrical conductivity and avoids local overheating. By setting the connecting arm 102, the conductive arm 13 can be detachably connected by bolts, and by setting the primary wiring board 201, the clamp of the primary main line can be detachably connected by bolts. As long as the interface dimensions are kept consistent, the interchangeability of each accessory can be ensured, and the versatility of the equipment is improved. In the disconnector terminal block assembly of the present invention, the flexible connection uses an entire conductive copper strip and the ends are fixed by a pressing method, reducing the risk of copper strip breakage.

[0042] In a specific embodiment of the present invention, as Figure 1 、 Figure 2 and Figure 7 shown, the disconnector terminal block assembly of the present invention further includes a backing plate 5. On one side of the copper strip through-groove 203, there is also provided a backing plate through-groove 204 with an increased height, and the backing plate 5 is inserted into the backing plate through-groove 204. The clearance width of the backing plate through-groove 204 is greater than the thickness of the backing plate 5. In the state of pressing the conductive copper strip 6, both ends of the backing plate 5 do not break away from the backing plate through-groove 204, that is, both ends of the backing plate 5 will not be hard bent. Two second threaded holes 205 are respectively provided at the upper and lower ends of the backing plate through-groove 204, and the corresponding number of tightening set screws 10 is also two. The two tightening set screws 10 tighten the backing plate 5, and the backing plate 5 presses the conductive copper strip 6 against the opposite side wall.

[0043] Specifically, the backing plate 5 is made of tin bronze plate material and has a thickness of not less than 4 mm, having good electrical conductivity and good stiffness at the same time.

[0044] Specifically, as Figure 5 shown, the vertical edge positions of the copper strip through-groove 203 and the backing plate through-groove 204 are both set as arc chamfers to avoid scratching and bending of the conductive copper strip 6.

[0045] By adding the backing plate through-groove 204 and the backing plate 5, when pressing the conductive copper strip 6, the extrusion damage of the inner end of the tightening set screw 10 to the conductive copper strip 6 can be reduced. At the same time, both sides of the pressed part in the middle of the conductive copper strip 6 can achieve good large-area electrical contact, improving the current-carrying capacity.

[0046] In a specific embodiment of the present invention, as Figure 1 、 Figure 2 、 Figure 6 and Figure 7As shown in the figure, the disconnecting switch terminal block assembly of the present invention further includes a limiting member 7. A third threaded hole 208 is provided at the middle position on the side wall of the copper strip through groove 203 opposite to the second threaded hole 205. The limiting member 7 is threadedly connected to the third threaded hole 208. A core rod 701 with elastic ejection is coaxially arranged in the middle of the limiting member 7, and the ejection direction of the core rod 701 is set inward. A central through hole is provided at the middle position of the backing plate 5, and a positioning pit 207 is provided on the side wall of the backing plate through groove 204 at the position of the central through hole. The third threaded hole 208, the central through hole, and the positioning pit 207 are coaxially arranged, and the diameter of the positioning pit 207 is smaller than the inner diameter of the third threaded hole 208. The inner end of the core rod 701 passes through the central through hole and enters the positioning pit 207.

[0047] Through the detachable setting of the limiting member 7, the core rod 701 of the limiting member 7 passes through the central through hole of the backing plate 5 and enters the positioning pit 207. During the transportation, maintenance, and replacement of the fittings, it plays a role in positioning and preventing the backing plate 5 from falling off, avoiding the loss of the backing plate 5.

[0048] In a specific embodiment of the present invention, as Figure 1 、 Figure 2 、 Figure 6 and Figure 7 shown, the limiting member 7 further includes a cylindrical shell, a fastening nut 703, and a compression spring 704. The inner end of the cylindrical shell is set as an external thread section 702 connecting the third threaded hole 208, and the outer end of the cylindrical shell is set as an external thread portion connecting the fastening nut 703. The inner end of the core rod 701 is thin and the outer end is thick, and it is coaxially and slidably arranged in the middle hole of the cylindrical shell. A circular ring platform is provided in the middle of the core rod 701. The compression spring 704 is sleeved on the outer cylindrical portion of the outer end of the core rod 701, and both ends respectively abut against the circular ring platform and the inner end face of the fastening nut 703. The outer end of the core rod 701 protrudes out of the middle hole of the fastening nut 703 and can be ejected outward. A limiting structure cooperating with the outer end of the core rod 701 is provided on the left inner side wall of the terminal block main housing 1. That is, the limiting structure can perform unilateral limiting on the outer end head of the core rod 701 pushed out by the conductive copper strip 6.

[0049] When the disconnecting switch is closed and working normally, the limiting structure performs pre-compression type unilateral limiting on the outer end head of the core rod 701, which can reduce the slight rotation of the main shaft member 2 driven by the wind when the primary main line is blown, thereby avoiding the slight reciprocating vibration of the conductive copper strip 6 following the main shaft member 2 and avoiding being slightly reciprocally bent.

[0050] Specifically, as Figure 1 、 Figure 2 、 Figure 6 and Figure 7 shown, the limiting structure includes a limiting slider 8 and a guide rail member. The guide rail member is horizontally arranged on the left inner side wall of the terminal block main housing 1. The limiting slider 8 slides along the guide of the guide rail member and can lock its position. The limiting slider 8 limits the outer end of the core rod 701.

[0051] Specifically, as shown in Figure 1 , Figure 2 , Figure 6 and Figure 7 , the guide rail member adopts a track groove 107 integrally formed with the main housing 1 of the terminal block, that is, the side strip of the track groove 107 is also an aluminum strip. The inner cross-section of the track groove 107 is a T-shaped profile, and the corresponding limit slider 8 is a T-shaped block. A fourth threaded hole 801 is opened at the middle position of the limit slider 8, and a positioning set screw 9 is threadedly connected in the fourth threaded hole 801. The positioning set screw 9 can lock the limit slider 8 in the track groove 107. The end face of the limit slider 8 abuts against the outer end wall of the core rod 701, and can prevent the core rod 701 from swinging in this direction. As shown in Figure 7 , the main housing 1 of the terminal block can be rotated counterclockwise by 90 degrees to open the disconnecting switch. In the closed state of the disconnecting switch, the limit slider 8 is pre-tightened against the outer end wall of the core rod 701, which can prevent the main shaft member 2 from slightly rotating with the primary main line blown by the wind. The so-called pre-tightening means that the limit slider 8 overcomes the torque of the elastic deformation recovery force of the primary main line.

[0052] Obviously, the inner cross-section of the track groove 107 can also be a dovetail profile, and the corresponding limit slider 8 is set as a dovetail block, which can also play a guiding and limiting role. Similar simple deformation methods all fall within the protection scope of the present invention.

[0053] It should be noted that both the positioning set screw 9 and the tightening set screw 10 are internal hexagon socket set screws, that is, there is no nut, and only a hexagonal hole for inserting a wrench is opened on the rear end face of the screw, which can be hidden and inserted into the screw hole to save space.

[0054] The outer end of the core rod 701 is pushed out only when the conductive copper strip 6 is installed, and then contacts the limiting structure, ensuring that only after the conductive copper strip 6 is connected to the main shaft member 2, the limiting structure can play a limiting role to protect the conductive copper strip 6. Through the arrangement of the track groove 107 and the limit slider 8, the limit slider 8 slides along the track groove 107 to guide and adjust the front and rear positions, and can realize the position where the limit slider 8 abuts against the outer end of the core rod 701, that is, adjust the pre-tightening rotation angle of the main shaft member 2, so that the primary main line will not swing under the action of normal wind force, and thus avoid the slight rotation of the main shaft member 2.

[0055] In a specific embodiment of the present invention, as shown in Figure 1 , Figure 4 and Figure 7 , the front and rear end faces of the main housing 1 of the terminal block are open, and first threaded holes 108 are opened at four corner positions, and an end cover 12 is detachably connected by screws. Rainproof louvre slits can be opened on the end cover 12.

[0056] By providing a detachable end cover 12, it is convenient for later maintenance and facilitates the adjustment of the limit slider 8.

[0057] In a specific embodiment of the present invention, as Figures 1 to 3 shown, upper middle holes 103 and lower middle holes 104 are respectively provided at the middle positions of the top plate and the bottom plate of the main housing 1 of the terminal block. Upper bushings 3 and lower bushings 4 are respectively arranged in the upper middle holes 103 and the lower middle holes 104, and the upper bushings 3 and the lower bushings 4 rotatably support the main shaft member 2. The upper bushings 3 and the lower bushings 4 are made of a composite material of polytetrafluoroethylene and graphite.

[0058] By adding upper bushings 3 and lower bushings 4 between the main housing 1 of the terminal block and the main shaft member 2, and the two are made of a specific composite material, it not only ensures the flexible rotation of this rotating part, but also effectively avoids the rust phenomenon.

[0059] In a specific embodiment of the present invention, as Figure 1 、 Figure 2 、 Figure 4 and Figure 7 shown, a sealing groove 106 arranged in a C-shaped layout is provided on the inner side wall of the connecting arm 102 at the periphery of the crimping area of the conductive copper strip 6, and a sealing ring is installed in the sealing groove 106. The protruding height of the sealing ring is slightly greater than the thickness of the conductive copper strip 6, and an effective seal can be formed when pressed. The sealing ring is specifically made of butyl rubber material and has good weather resistance and high temperature resistance.

[0060] By providing a sealing groove 106 that surrounds the crimping area of the conductive copper strip 6 on three sides on the inner side wall of the connecting arm 102 and installing the sealing ring, it can reduce the direct contact between the conductive copper strip 6 and the external environment, avoid rust caused by rainwater, and improve the service life.

[0061] Installation process of the disconnecting switch terminal block assembly of the present invention: First, install the main terminal block housing 1 on the top fitting of the cylindrical insulator. Use four bottom screws to install through the bolt through-holes on the bottom plate of the leg 101, paying attention to the installation direction, with the connecting arm 102 facing the opposite cylindrical insulator. Press and install the upper bushing 3 and the lower bushing 4 into the upper middle hole 103 and the lower middle hole 104 respectively. Then, remove the limit piece 7 from the main shaft part 2 and take out the spacer 5. Insert the smooth shaft part of the main shaft part 2 from top to bottom into the upper bushing 3 and the lower bushing 4, and use a snap ring to install it into the snap ring groove 206 at the bottom end of the main shaft part 2 for axial positioning. Thread the conductive copper strip 6 into the copper strip through-groove 203 and align the two ends, that is, roughly ensure that the middle position of the conductive copper strip 6 is located in the copper strip through-groove 203. Re-insert the spacer 5 into the spacer through-groove 204, and install the lower limit piece 7 onto the third threaded hole 208 of the main shaft part 2. Use an inner hexagon wrench to tighten the tightening set screw 10 in the second threaded hole 205. The inner end of the tightening set screw 10 pushes against the spacer 5, and the spacer 5 presses the conductive copper strip 6 against the side wall of the copper strip through-groove 203 to complete the connection at the middle position. Bond the sealing ring in the sealing groove 106, flatten the two ends of the conductive copper strip 6 and place them in the inner area of the sealing groove 106. Insert the end of the conductive arm 13 between the two connecting arms 102, and use screws to thread-connect the threaded holes on the side wall of the conductive arm 13 through the first bolt through-hole 105 to achieve the installation connection. Treat the leakage gap with sealant. The primary wiring board 201 installs the clamp of the primary main line through bolts. The primary main line will drive the main shaft part 2 to achieve a slight rotation angle in a free state; use an inner hexagon wrench to loosen the positioning set screw 9, adjust the position of the limit slider 8 sliding along the track groove 107, so that the end face of the limit slider 8 abuts against the outer end wall of the core rod 701, and lock the positioning set screw 9. Note that the position of the limit slider 8 cannot be installed reversely and cannot prevent the main terminal block housing 1 from rotating 90 degrees to open. Finally, install the end covers 12 on the front and rear end faces of the main terminal block housing 1 to complete the installation.

[0062] In summary, for the disconnecting switch terminal block assembly of the present invention, by providing a complete conductive copper strip 6 as the core component of the flexible connection within the terminal block, the hidden defects caused by mechanical cutting are reduced; by pressing the middle position of the conductive copper strip 6 into the copper strip through groove 203 to connect with the main shaft member 2, and pressing the two ends onto the outer wall of the end of the conductive arm 13 to connect the conductive arm 13, mechanical processing of through holes is avoided throughout the entire length. And compared with the bolt pressing method, the pressing method of surface-to-surface contact has good electrical conductivity and avoids local overheating. By providing the connecting arm 102 with bolts for detachably connecting the conductive arm 13, and providing the primary wiring board 201 with bolts for detachably connecting the clamp of the primary main line, as long as the interface dimensions remain consistent, the interchangeability of each accessory can be ensured, and the versatility of the equipment is improved. For the disconnecting switch terminal block assembly of the present invention, the flexible connection uses a whole conductive copper strip and the ends are fixed by a pressing method, reducing the risk of copper strip breakage. In addition, by adding the backing plate through groove 204 and the backing plate 5, when pressing the conductive copper strip 6, the extrusion damage of the inner end of the tightening set screw 10 to the conductive copper strip 6 can be reduced. At the same time, both sides of the pressed part in the middle of the conductive copper strip 6 can achieve good large-area electrical contact, improving the current-carrying performance. Through the setting of the detachable limiting member 7, the core rod 701 of the limiting member 7 passes through the central through hole of the backing plate 5 and enters the positioning pit 207, playing a role of positioning and preventing the backing plate 5 from falling off during the transportation and maintenance and replacement of the accessories, avoiding the loss of the backing plate 5. By the outer end of the core rod 701 being pushed out only when the conductive copper strip 6 is installed and then contacting the limiting structure, it is ensured that only after the conductive copper strip 6 is connected to the main shaft member 2, the limiting structure can play a limiting role to protect the conductive copper strip 6. Through the setting of the track groove 107 and the limiting slider 8, the limiting slider 8 slides along the track groove 107 to guide and adjust the front and rear positions, and the position where the limiting slider 8 presses against the outer end of the core rod 701 can be realized, that is, the pre-tightening rotation angle of the main shaft member 2 is adjusted, so that the primary main line will not swing under the action of normal wind force, and the slight rotation of the main shaft member 2 is also avoided. By providing the detachable end cover 12, it is convenient for later inspection and maintenance and convenient for adjusting the limiting slider 8. By adding an upper shaft sleeve 3 and a lower shaft sleeve 4 between the main housing 1 of the terminal block and the main shaft member 2, and the two are made of specific composite materials, it not only ensures the flexible rotation of this rotating part, but also effectively avoids the rust phenomenon. By opening a sealing groove 106 surrounding the pressing area of the conductive copper strip 6 on the inner side wall of the connecting arm 102 and installing the sealing ring, the direct contact between the conductive copper strip 6 and the external environment can be reduced, avoiding rainwater corrosion and improving the service life.

[0063] The present invention also discloses a working method for a disconnecting switch terminal block assembly, using the disconnecting switch terminal block assembly in any of the above embodiments to connect the primary main line and the conductive arm 13, and using a whole conductive copper strip 6 and the connection positions are all connected by a pressing method.

[0064] The integral conductive copper strip 6 reduces the mechanical damage introduced during processing. The crimping method for connecting the conductive parts avoids openings compared to bolt connections and also avoids the introduction of microcracks, improving the service life of the soft connection at the core of the conductive copper strip 6.

[0065] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and reference can be made to the description in the method part for relevant parts.

[0066] The above-described embodiments are only descriptions of the preferred modes of the present invention, not limitations on the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. An isolating switch terminal block assembly is arranged at the top of a single-stage insulator of a double-column horizontally rotating high-voltage isolating switch and is used for connecting a primary main line and a conductive arm (13). It is characterized in that, Comprising: A main housing (1) of a terminal block, legs (101) for connecting the insulator are arranged at the bottom of the main housing (1) of the terminal block, two connecting arms (102) protrude in parallel from one side wall of the main housing (1) of the terminal block, and the two connecting arms (102) are connected to the outer wall of the conductive arm (13) by bolts; A main shaft member (2), the main shaft member (2) is vertically rotatably installed at the middle position of the main housing (1) of the terminal block, the top of the main shaft member (2) protrudes out of the main housing (1) of the terminal block and is connected with a primary wiring board (201) for connecting the primary main line; a copper strip passing groove (203) is radially opened at the middle part of the main shaft member (2) in the cavity of the main housing (1) of the terminal block, and a second threaded hole (205) is arranged perpendicular to the copper strip passing groove (203), and a tightening set screw (10) is arranged in the second threaded hole (205); A conductive copper strip (6), the conductive copper strip (6) passes through the copper strip passing groove (203) and is pressed at the middle position by the tightening set screw (10), and two ends of the conductive copper strip (6) are respectively pressed by the connecting arms (102) on two opposite outer walls at the end of the conductive arm (13).

2. The disconnector terminal block assembly according to claim 1, characterized in that: It further includes a backing plate (5), a backing plate passing groove (204) with an increased height is further arranged on one side of the copper strip passing groove (203), the backing plate (5) is inserted into the backing plate passing groove (204), and the two second threaded holes (205) are respectively arranged at the upper and lower ends of the backing plate passing groove (204); the two tightening set screws (10) press against the backing plate (5), and the backing plate (5) presses the conductive copper strip (6) against the opposite side wall.

3. The disconnector terminal block assembly according to claim 2, wherein: It further includes a limiting member (7), a third threaded hole (208) is opened at the middle position of the side wall of the copper strip passing groove (203) opposite to the second threaded hole (205), the limiting member (7) is threadedly connected to the third threaded hole (208), and a core rod (701) that elastically ejects coaxially is arranged in the middle of the limiting member (7); a central through hole is opened at the middle position of the backing plate (5), and a positioning pit (207) is opened on the side wall of the backing plate passing groove (204) at the position of the central through hole, and the inner end of the core rod (701) passes through the central through hole and enters the positioning pit (207).

4. The disconnecting switch terminal block assembly according to claim 3, wherein: The outer end of the core rod (701) protrudes out of the housing of the limiting member (7) and can be ejected outwards, and a limiting structure matched with the outer end of the core rod (701) is arranged on the left inner side wall of the main housing (1) of the terminal block.

5. The disconnecting switch terminal block assembly according to claim 4, characterized in that: The limiting structure includes a limiting slider (8) and a guide rail member, the guide rail member is horizontally arranged on the left inner side wall of the main housing (1) of the terminal block, the limiting slider (8) slides along the guide of the guide rail member and can lock the position, and the limiting slider (8) limits the outer end of the core rod (701).

6. The disconnecting switch terminal block assembly according to claim 5, characterized in that The guide rail member adopts a track groove (107) integrally formed with the main housing (1) of the terminal block. The inner cross-section of the track groove (107) is a T-shaped profile, and correspondingly, the limit slider (8) is a T-shaped block. A fourth threaded hole (801) is provided at the middle position of the limit slider (8), and a positioning set screw (9) is threadedly connected in the fourth threaded hole (801). The positioning set screw (9) can lock the limit slider (8) in the track groove (107).

7. The disconnector terminal block assembly according to claim 1, characterized in that: The front and rear end faces of the main housing (1) of the terminal block are open and detachably connected with end caps (12).

8. The disconnecting switch terminal block assembly according to claim 1, characterized in that: Upper middle holes (103) and lower middle holes (104) are respectively provided at the middle positions of the top plate and the bottom plate of the main housing (1) of the terminal block. Upper bushings (3) and lower bushings (4) are respectively arranged in the upper middle holes (103) and the lower middle holes (104). The upper bushings (3) and the lower bushings (4) rotatably support the main shaft member (2). The upper bushings (3) and the lower bushings (4) are made of a composite material of polytetrafluoroethylene and graphite.

9. The disconnector terminal block assembly according to claim 1, characterized in that: Sealing grooves (106) arranged in a C shape are provided on the inner side wall of the connecting arm (102) on the periphery of the crimping area of the conductive copper strip (6), and sealing rings are installed in the sealing grooves (106).

10. A working method of a disconnector terminal block assembly, characterized in that: When using the disconnecting switch terminal block assembly according to any one of claims 1 to 9 to connect the primary main line and the conductive arm (13), an integral conductive copper strip (6) is adopted and the connection positions are all connected in a pressing manner.

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