Static contact assembly and disconnector

Abstract

The application belongs to the technical field of high-voltage switches, and particularly relates to a static contact assembly and a disconnecting switch. The static contact assembly comprises a contact seat and a conductive contact finger arranged on the contact seat and used for electrically contacting with a moving contact assembly of the disconnecting switch, the conductive contact finger comprises a main contact finger and an auxiliary contact finger and an arc striking contact finger symmetrically arranged on one end of the contact seat for inserting the moving contact, and the arc striking contact finger is provided with an arc striking block. The structure of the static contact assembly of the prior art is simplified, and a compact structure design is easily realized. In the bus conversion operation process, the main contact finger is used for passing current before the moving contact and the conductive contact finger of the static contact are separated, and a large current is led to the arc striking contact finger through the arc striking block after the moving contact and the conductive contact finger are separated, and the arc striking block is ablated when the moving contact and the arc striking block are separated, so that the ablation of the arc to the conductive contact finger is effectively reduced, the ablation resistance of the static contact is improved, and the service life of the disconnecting switch is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of high voltage switch technology, and particularly relates to stationary contact assemblies and disconnecting switches. Background Technology

[0002] Disconnect switches are important equipment used in conjunction with circuit breakers in substations, transmission and distribution lines. Their main purpose is to ensure the safety of high-voltage equipment maintenance work. They create a sufficiently large and clearly visible air insulation gap between the part to be maintained and other energized parts, thus forming a clear disconnection point.

[0003] In power systems, double busbar connections are commonly used. During alternating maintenance of the two busbars, to ensure uninterrupted power supply during switchgear maintenance, repeated switching operations on the disconnecting switch will disconnect the busbars. This results in residual induced current and voltage in the system. Consequently, the disconnecting switch knife generates a high-energy arc during opening. This arc can erode the contact surface and conductive fingers, reducing the insulation strength of the disconnecting switch's break and potentially causing it to lose its current-carrying capacity and isolation function. Therefore, the design of disconnecting switch contacts must consider their erosion resistance to ensure high busbar switching performance and extend the disconnecting switch's service life.

[0004] With the increasing voltage levels of the power grid and the growing demand for compact design of disconnecting switch products, the requirements for busbar switching technical parameters of disconnecting switches are also becoming more stringent, increasing the difficulty of compact structure design. Currently, the contact structures of commonly used compact disconnecting switches on the market are difficult to meet the 1600A, 100V busbar switching technical parameter requirements. During frequent busbar switching of the disconnecting switch, this means that higher arc energy will be generated, making it easier to burn the contact fingers of the stationary contact of the disconnecting switch, which seriously affects the service life of the disconnecting switch.

[0005] Chinese utility model patent CN201126789Y, authorized on October 1, 2008, discloses a three-position isolating / grounding switch for high-voltage electrical appliances. It includes an isolating stationary contact assembly, a moving contact assembly, and a grounding stationary contact assembly. The isolating stationary contact assembly has the same structure as the grounding stationary contact assembly, both including a shield, first contact fingers, a first shaft, a first spring, a pin, a second shaft, and a second spring. Several first contact fingers are evenly divided into two groups and placed between the inner grooves of the shield. Each group of first contact fingers is connected together by a first shaft. The two groups of first contact fingers are connected together by a pin and a second spring. The two shields are connected together by a second shaft. This solution has a simple structure and small size, but lacks optimization of the stationary contact's ablation resistance, making it difficult to meet the application scenarios requiring high busbar switching technical parameters. Summary of the Invention

[0006] The purpose of this invention is to provide a stationary contact assembly to overcome the problem of severe erosion of the conductive fingers of the stationary contact of the disconnector switch caused by the high arc energy generated during the bus switching process. This invention also provides a disconnector switch to solve the same problem.

[0007] To achieve the above objectives, the stationary contact assembly of the present invention adopts the following technical solution:

[0008] The stationary contact assembly includes a contact base, on which a boss extends along the insertion direction of the moving contact. With the insertion direction of the moving contact as the front-back direction, symmetrical contact finger groups connected in series by screws are arranged on the left and right sides of the boss. A shield is also fixed on the contact base, and the contact finger groups are arranged inside the shield. A tension spring is arranged between the oppositely arranged contact finger groups. An arc-inducing block is arranged on the contact finger at the end of the contact finger group where the moving contact is inserted.

[0009] The beneficial effects of the above technical solution are as follows: In the bus switching operation, the stationary contact assembly provided by the present invention mainly carries current through the main contact finger of the stationary contact assembly before the conductive fingers of the moving contact and the stationary contact are separated; after the moving contact and the conductive fingers are separated, the large current is led to the arc-starting finger through the arc-starting block. When the moving contact and the arc-starting block are separated, the arc starts to ignite. At this time, the arc burns the arc-starting block, thus effectively reducing the arc's erosion of the conductive fingers, thereby improving the stationary contact's erosion resistance and extending the service life of the disconnecting switch.

[0010] Furthermore, the foremost contact finger of the contact finger assembly is an auxiliary contact finger, and the auxiliary contact finger is provided with an avoidance notch so that the upper part of the auxiliary contact finger forms a limiting arm for blocking and limiting the arc-starting block.

[0011] The beneficial effect of the above technical solution is that this design can ensure that the movement of the finger plate where the arc-initiating block is located is within an effective range, thereby improving the arc-initiating effect.

[0012] Furthermore, the arc-inducing block has a guide ramp for guiding the moving contact into the space between the two contact finger groups.

[0013] The beneficial effects of the above technical solution are as follows: this design increases the angle between the moving contact and the contact finger assembly, reduces the frictional force of the moving contact at the initial moment of insertion into the stationary contact, and plays a guiding role.

[0014] Furthermore, at least two protrusions are provided on the finger piece to form a gap between adjacent finger pieces.

[0015] The beneficial effect of the above technical solution is that, with this design, the round bump can create a gap between the two contact fingers, which can effectively promote heat dissipation of the contact.

[0016] Furthermore, the contact finger piece is provided with a tension spring connecting pin, the end of which is located within the gap, and the two ends of the tension spring are respectively connected to the ends of two tension spring cylindrical pins.

[0017] The beneficial effects of the above technical solution are as follows: With this design, the cylindrical pin can limit the range of motion of the fixed contact finger to ensure the limit position of the contact finger in the natural state and the limit position in the closed state. Through the cooperation of the cylindrical pin and the tension spring, the contact clamping force between the contact finger and the contact seat can be effectively guaranteed. The tension spring increases the clamping force between the two relative contact fingers and the contact seat and the moving contact, making the current flow in the main circuit reliable.

[0018] Furthermore, a stop washer is provided between adjacent contact finger pieces, and at least two stop pins are provided on the stop washer, one of which constitutes the tension spring connecting pin.

[0019] The beneficial effects of the above technical solution are as follows: This design can effectively limit the forward and backward movement of the cylindrical pin, which can play a stopping role, while forming a gap between adjacent contact fingers to promote heat dissipation of the contact fingers; it can also prevent the safety risks caused by metal shavings generated by friction between two adjacent sets of contact fingers due to relative movement; the setting of the cylindrical pin can keep the contact fingers balanced under the action of spring tension and make the position of adjacent contact fingers unique, which makes it easy for the moving contact to be inserted into the stationary contact in the center.

[0020] Furthermore, the stop washers and protrusions of each contact finger assembly are arranged alternately in the front-to-back direction.

[0021] The beneficial effect of the above technical solution is that this design can ensure that a set gap is formed between adjacent touch finger pieces.

[0022] Furthermore, two shielding covers are provided, located on the front and rear sides of the contact seat respectively, and a compression spring is provided between the shielding cover and the contact finger assembly.

[0023] The beneficial effects of the above technical solution are as follows: With this design, the shields set at the front and back form the installation space for the contact finger assembly, which not only isolates the electric arc but also optimizes the electric field of the disconnect switch. The compression spring set between the shield and the contact finger can restrict the entire contact finger assembly between the two shields and also press the contact finger together to prevent the contact finger from moving.

[0024] Furthermore, the boss has a through fixing hole through which a screw for fixing the shielding cover to the contact seat is inserted.

[0025] The advantages of the above technical solution are as follows: This design makes it easy to fix the shielding cover, thereby constraining the spatial position and size between the shielding covers; the left and right sides of the boss enable contact and conductivity with the contact finger piece, while the front and rear end faces of the boss limit the installation position and accuracy of the shielding cover, preventing the shielding cover from moving during the operation of the moving contact; the overall structure is compact and easy to implement.

[0026] To achieve the above objectives, the disconnecting switch of the present invention adopts the following technical solution:

[0027] A disconnecting switch includes a housing, a stationary contact assembly, and a moving contact assembly. The stationary contact assembly includes a contact base with a boss extending along the insertion direction of the moving contact. With the insertion direction of the moving contact as the front-back direction, symmetrical contact finger groups connected in series by screws are arranged on the left and right sides of the boss. A shielding cover is also fixed on the contact base, and the contact finger groups are disposed inside the shielding cover. A tension spring is provided between the oppositely arranged contact finger groups. An arc-inducing block is provided on the contact finger at the end of the contact finger group where the moving contact is inserted.

[0028] The beneficial effects of the above technical solution are as follows: In the bus switching operation, the stationary contact assembly provided by the present invention mainly carries current through the main contact finger of the stationary contact assembly before the conductive fingers of the moving contact and the stationary contact are separated; after the moving contact and the conductive fingers are separated, the large current is led to the arc-starting finger through the arc-starting block. When the moving contact and the arc-starting block are separated, the arc starts to ignite. At this time, the arc burns the arc-starting block, thus effectively reducing the arc's erosion of the conductive fingers, thereby improving the stationary contact's erosion resistance and extending the service life of the disconnecting switch.

[0029] Furthermore, the foremost contact finger of the contact finger assembly is an auxiliary contact finger, and the auxiliary contact finger is provided with an avoidance notch so that the upper part of the auxiliary contact finger forms a limiting arm for blocking and limiting the arc-starting block.

[0030] The beneficial effect of the above technical solution is that this design can ensure that the movement of the finger plate where the arc-initiating block is located is within an effective range, thereby improving the arc-initiating effect.

[0031] Furthermore, the arc-inducing block has a guide ramp for guiding the moving contact into the space between the two contact finger groups.

[0032] The beneficial effects of the above technical solution are as follows: this design increases the angle between the moving contact and the contact finger assembly, reduces the frictional force of the moving contact at the initial moment of insertion into the stationary contact, and plays a guiding role.

[0033] Furthermore, at least two protrusions are provided on the finger piece to form a gap between adjacent finger pieces.

[0034] The beneficial effect of the above technical solution is that, with this design, the round bump can create a gap between the two contact fingers, which can effectively promote heat dissipation of the contact.

[0035] Furthermore, the contact finger piece is provided with a tension spring connecting pin, the end of which is located within the gap, and the two ends of the tension spring are respectively connected to the ends of two tension spring cylindrical pins.

[0036] The beneficial effects of the above technical solution are as follows: With this design, the cylindrical pin can limit the range of motion of the fixed contact finger to ensure the limit position of the contact finger in the natural state and the limit position in the closed state. Through the cooperation of the cylindrical pin and the tension spring, the contact clamping force between the contact finger and the contact seat can be effectively guaranteed. The tension spring increases the clamping force between the two relative contact fingers and the contact seat and the moving contact, making the current flow in the main circuit reliable.

[0037] Furthermore, a stop washer is provided between adjacent contact finger pieces, and at least two stop pins are provided on the stop washer, one of which constitutes the tension spring connecting pin.

[0038] The beneficial effects of the above technical solution are as follows: This design can effectively limit the forward and backward movement of the cylindrical pin, which can play a stopping role, while forming a gap between adjacent contact fingers to promote heat dissipation of the contact fingers; it can also prevent the safety risks caused by metal shavings generated by friction between two adjacent sets of contact fingers due to relative movement; the setting of the cylindrical pin can keep the contact fingers balanced under the action of spring tension and make the position of adjacent contact fingers unique, which makes it easy for the moving contact to be inserted into the stationary contact in the center.

[0039] Furthermore, the stop washers and protrusions of each contact finger assembly are arranged alternately in the front-to-back direction.

[0040] The beneficial effect of the above technical solution is that this design can ensure that a set gap is formed between adjacent touch finger pieces.

[0041] Furthermore, two shielding covers are provided, located on the front and rear sides of the contact seat respectively, and a compression spring is provided between the shielding cover and the contact finger assembly.

[0042] The beneficial effects of the above technical solution are as follows: With this design, the shields set at the front and back form the installation space for the contact finger assembly, which not only isolates the electric arc but also optimizes the electric field of the disconnect switch. The compression spring set between the shield and the contact finger can restrict the entire contact finger assembly between the two shields and also press the contact finger together to prevent the contact finger from moving.

[0043] Furthermore, the boss has a through fixing hole through which a screw for fixing the shielding cover to the contact seat is inserted.

[0044] The advantages of the above technical solution are as follows: This design makes it easy to fix the shielding cover, thereby constraining the spatial position and size between the shielding covers; the left and right sides of the boss enable contact and conductivity with the contact finger piece, while the front and rear end faces of the boss limit the installation position and accuracy of the shielding cover, preventing the shielding cover from moving during the operation of the moving contact; the overall structure is compact and easy to implement. Attached Figure Description

[0045] Figure 1 This is a schematic diagram illustrating the application conditions of the stationary contact of the disconnector switch according to the present invention;

[0046] Figure 2 A 3D view of the stationary contact assembly;

[0047] Figure 3 for Figure 2 The front view;

[0048] Figure 4 for Figure 3 LL section view;

[0049] Figure 5 for Figure 3 AA section view;

[0050] Figure 6 for Figure 3 BB cross-sectional view;

[0051] Figure 7 for Figure 3 CC section view;

[0052] Figure 8 for Figure 2 A schematic diagram of the structure after removing the shielding cover;

[0053] Figure 9 for Figure 8 A structural diagram showing the removal of the two contact fingers and the compression spring;

[0054] Figure 10 for Figure 9 A structural diagram showing the removal of the two finger-shaped pieces at the top;

[0055] Figure 11 for Figure 10 A structural diagram showing the removal of the 33 finger-shaped pieces above;

[0056] Figure 12 for Figure 7 Top view of two operating conditions after removing the two compression springs and the front shield;

[0057] Figure 13 for Figure 2 Schematic diagram of the two front and rear shielding structures;

[0058] Figure 14 This is a schematic diagram of the contact seat structure;

[0059] Figure 15 A schematic diagram of the main contact finger plate;

[0060] Figure 16 This is a schematic diagram of the arc-initiating contact finger plate;

[0061] Figure 17 A schematic diagram of the structure of the auxiliary finger plate.

[0062] In the diagram: 101, moving contact; 102, stationary contact assembly; 103, stationary contact closed state; 104, stationary contact open state;

[0063] 201. Rear shield; 202. Front shield; 203. Contact seat; 204. First bolt;

[0064] 301, First washer; 302, Long screw; 303, Second washer;

[0065] 401. Group 1 Main Contact Finger; 402. Group 2 Main Contact Finger; 403. Group 3 Main Contact Finger; 404. Group 4 Main Contact Finger; 405. Group 5 Main Contact Finger; 406. Group 6 Main Contact Finger; 407. Group 7 Main Contact Finger; 408. Group 8 Main Contact Finger; 409. Group 9 Main Contact Finger; 410. Group 1 Arc-Initiating Contact Finger; 411. Group 1 Auxiliary Contact Finger; 412. Group 1 Flat Contact Finger 413. Washer; 414. First connecting bolt; 415. Second flat washer; 416. Second connecting bolt; 417. Second auxiliary contact finger; 418. Second arc-starting contact finger; 419. Tenth group of main contact fingers; 420. Eleventh group of main contact fingers; 421. Twelfth group of main contact fingers; 422. Thirteenth group of main contact fingers; 423. Fourteenth group of main contact fingers; 424. Fifteenth group of main contact fingers 424. 16th group of main contact fingers; 425. 17th group of main contact fingers; 426. 18th group of main contact fingers; 427. First connecting screw; 428. Third connecting bolt; 429. Third flat washer; 430. Second connecting screw; 431. Fourth flat washer; 432. Fourth connecting bolt; 433. First clamping spring; 434. Second clamping spring; 435. Third clamping spring; 436. Fourth clamping spring; 437. Fifth clamping spring; 438. Sixth clamping spring; 439. Seventh clamping spring; 440. Eighth clamping spring; 441. Ninth clamping spring; 442. Tenth clamping spring; 443. First compression spring; 444. Third compression spring; 445. Second compression spring; 446. Fourth compression spring;

[0066] 501, First main contact finger; 502, Second main contact finger;

[0067] 601. Cylindrical pin; 602. Clamping spring mounting fit;

[0068] 701. Stop washer;

[0069] 801, First arc-leading finger plate; 802, Second arc-leading finger plate;

[0070] 901. Closing limit position; 902. Opening limit position;

[0071] 1001, First fixing hole; 1002, First mounting hole; 1003, First fixing plane of shielding cover; 1004, First countersunk hole; 1005, Second fixing plane of shielding cover; 1006, Second countersunk hole; 1007, Second fixing hole;

[0072] 1101. First mating surface of the shielding cover; 1102. Second mating surface of the shielding cover; 1103. First contact surface of the contact finger; 1104. Mounting hole for the long screw;

[0073] 1201, First circular boss; 1202, First elongated hole; 1203, First mating surface; 1204, First circular hole; 1205, First arc surface; 1206, Second arc surface; 1207, Second circular boss; 1208, Second mating surface; 1209, Second elongated hole;

[0074] 1301, First support surface; 1302, Third elongated hole; 1303, First arc-starting block; 1304, Second arc-starting block; 1305, Fourth elongated hole; 1306, Second circular hole;

[0075] 1401, First blocking surface; 1402, Fifth elongated hole; 1403, Third round hole; 1404, Third round boss; 1405, Second blocking surface; 1406, Sixth elongated hole. Detailed Implementation

[0076] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0077] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0078] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0079] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0080] Embodiment 1 of the disconnecting switch in this invention:

[0081] like Figures 1-3 As shown, the disconnecting switch includes a housing (not marked in the figure), a moving contact assembly, and a stationary contact assembly 102. The stationary contact assembly 102 includes a contact base 203. The contact base 203 is provided with a boss extending along the insertion direction of the moving contact 101. With the insertion direction of the moving contact 101 as the front-back direction, symmetrical contact finger groups connected in series by screws are arranged on the left and right sides of the boss. A shielding cover is also fixed on the contact base 203. The contact finger groups are arranged inside the shielding cover. A clamping spring is arranged between the oppositely arranged contact finger groups. An arc-inducing block is provided on the contact finger at the end of the contact finger group where the moving contact is inserted.

[0082] When the moving contact 101 is fully inserted into the stationary contact assembly 102, it is in the stationary contact closed state 103; when the moving contact 101 is completely separated from the stationary contact assembly 102, it is in the stationary contact open state 104.

[0083] like Figure 2 and Figure 3 As shown, the stationary contact assembly 102 mainly includes a contact finger assembly, a rear shield 201, a front shield 202, and a contact base 203. The contact finger assembly is disposed on the contact base 203 and located within the space enclosed by the rear shield 201 and the front shield 202.

[0084] like Figure 13As shown, the front shield 202 and the rear shield 201 are rectangular cavities with identical shapes. The cavities have rounded corners to optimize the electric field at the disconnection point of the disconnector. One end of the cavity is provided with a slot to prevent the insertion of the moving contact. The outer surface of the cavity is provided with a first mounting hole 1002, a first fixing hole 1001 and a second fixing hole 1007 arranged symmetrically. In this embodiment, all three holes are countersunk holes, which can prevent the bolt heads from being exposed and causing a decrease in insulation strength during subsequent installation and fixing. The inner surface of the cavity is provided with a first countersunk hole 1004 and a second countersunk hole 1006 symmetrically arranged along the first mounting hole 1002. The end away from the slot is provided with a first fixing plane 1003 for the shield and a second fixing plane 1005 for the shield on the inner surface of the cavity.

[0085] like Figure 14 As shown, a cuboid boss is provided on the contact base 203. A long screw mounting hole 1104 is provided in the middle of the cuboid boss. The two end faces of the boss are respectively provided with shielding cover first mating surfaces 1101 for cooperating with the rear shielding cover 201 and the front shielding cover 202. This can limit the installation position accuracy of the shielding cover and prevent the shielding cover from moving. Conductive contact finger first contact surfaces 1103 are provided on both sides of the boss along the length direction of the boss. The end face of the contact base 203 is provided with shielding cover second mating surfaces 1102 perpendicular to the conductive contact finger first contact surfaces 1103.

[0086] like Figures 2-4 , Figures 13-14 As shown, a long screw 302 passes through a long screw mounting hole 1104 and connects to the front shield 202 and the rear shield 201, which are respectively located at both ends of the cuboid boss. A second washer 303 is provided at the end of the long screw 302 that contacts the rear shield 201, and a first washer 301 is provided at the end of the long screw 302 that contacts the front shield 202. A first bolt 204 presses the front shield 202 and the rear shield 201 onto the cuboid boss of the contact seat 203 through the long screw 302. The first bolt 204 passes through a first mounting hole 1002 in the front shield 202 and connects to the long screw 302. The first mating surface 1101 of the shield and the second fixing surface 1005 of the shield are in contact, while the first fixing surface 1003 of the shield and the second mating surface 1102 of the shield are in close contact. In this way, the front shield 202 and the rear shield 201 are fixed on the contact seat 203 by the long screw 302. This creates a space for mounting the finger piece, which is enclosed by the front shield 202, the rear shield 201, and the boss.

[0087] like Figure 5 As shown, auxiliary contacts, arc-inducing contacts, and main contacts are sequentially installed within the contact patch mounting space. In this embodiment, the main contacts are divided into 18 groups, there are 2 arc-inducing contacts, and 20 auxiliary contacts, as shown... Figure 5The following are arranged sequentially from right to left (opposite to the direction of moving contact insertion, from back to front): The top group consists of main contact fingers 401 to 409 (group 1), main contact fingers 410 (group 1), and auxiliary contact fingers 411 (group 1). The bottom group consists of auxiliary contact fingers 416 (group 2), arc-starting contact fingers 417 (group 2), and main contact fingers 418 (group 10) to 426 (group 18). The upper contact finger group is connected between the front shield 202 and the rear shield 201 via a second connecting screw 430. The left end of the second connecting screw 430 is connected via a first flat washer 4. 12 and the first connecting bolt 413 are fixed to the front shield 202. The right end of the second connecting screw 430 is fixed to the rear shield 201 by the fourth flat washer 431 and the fourth connecting bolt 432. The lower contact finger assembly is connected in series between the front shield 202 and the rear shield 201 by the first connecting screw 427. The left end of the first connecting screw 427 is fixed to the front shield 202 by the second flat washer 414 and the second connecting bolt 415. The right end of the first connecting screw 427 is fixed to the rear shield 201 by the third flat washer 429 and the third connecting bolt 428.

[0088] like Figure 5 , Figure 6 As shown, the first group of main contact fingers 401 and the eighteenth group of main contact fingers 426 are connected by the first clamping spring 433 to form a... Figure 8 The clamping spring shown is fitted with 602. Similarly, the second group of main contact fingers 402 and the 17th group of main contact fingers 425 are connected by the second clamping spring 434; the third group of main contact fingers 403 and the 16th group of main contact fingers 424 are connected by the third clamping spring 435; the fourth group of main contact fingers 404 and the 15th group of main contact fingers 423 are connected by the fourth clamping spring 436; the fifth group of main contact fingers 405 and the 14th group of main contact fingers 422 are connected by the fifth clamping spring 437; and the sixth group of main contact fingers 406 and the 13th group of main contact fingers... 421 is connected via the 6th clamping spring 438; the 7th group of main contact fingers 407 and the 12th group of main contact fingers 420 are connected via the 7th clamping spring 439; the 8th group of main contact fingers 408 and the 11th group of main contact fingers 419 are connected via the 8th clamping spring 440; the 9th group of main contact fingers 408 and the 11th group of main contact fingers 419 are connected via the 9th clamping spring 441; and the 1st arc-initiating contact finger 410, the 1st auxiliary contact finger 411, the 2nd arc-initiating contact finger 417, and the 2nd auxiliary contact finger 416 are connected via the 10th clamping spring 442.

[0089] like Figure 4 , Figure 7As shown, the first auxiliary contact finger 411 is pressed by the second compression spring 445, the second auxiliary contact finger 416 is pressed by the first compression spring 443, the first group of main contact fingers 401 is pressed by the fourth compression spring 446, and the 18th group of main contact fingers 426 is pressed by the third compression spring 444. One end of the compression spring abuts against the first countersunk hole 1004 and the second countersunk hole 1006 of the shielding cover, and the other end abuts against the round protrusion of the auxiliary contact finger or the main contact finger. This design is because the front shielding cover 202 and the rear shielding cover 201 are connected and fixed to the contact seat 203 by the long screw 302. The space between the two shielding covers is already constrained. When the contact finger assembly is installed between the shielding covers, the whole assembly will move back and forth due to the space constraints. Therefore, one end of the compression spring is set on the shielding cover to press the contact finger pieces, thereby restricting the entire contact finger assembly between the two shielding covers.

[0090] like Figures 8-10 , Figure 15 As shown, taking the first group of main contact fingers 401 as an example, it is formed by combining a first main contact finger piece 501 and a second main contact finger piece 502. Specifically, the first main contact finger piece 501 has a first elongated hole 1202 at its center, and a first round hole 1204 is symmetrically arranged near the first elongated hole 1202. First round bosses 1201 are symmetrically arranged at both ends of the first main contact finger piece 501 with the first elongated hole 1202 as the center. The centers of the first round bosses 1201, the first elongated hole 1202, and the first round hole 1204 are coaxial. Correspondingly, the second main contact finger piece 502 has a first round hole 1204, a second round boss 1207, and a second elongated hole 1209. The first elongated hole 1202 is used to insert the first connecting screw 427, and the two first round holes 1204 on the first and second main contact finger pieces 501 and 502 are used to install the cylindrical pin 60. 1. After installation, the first circular boss 1201 on the first main contact finger piece 501 and the second circular boss 1207 on the second main contact finger piece 502 correspond to each other, thus forming a gap between adjacent contact finger pieces. The end of the cylindrical pin 601 located within this gap is used to connect the clamping spring. Each group of main contact fingers is fixed into a group of main contact fingers by the first main contact finger piece 501 and the second main contact finger piece 502 through the cylindrical pin 601. Each group of main contact fingers is separated from each other by a stop washer 701. The stop washer 701 abuts against the cylindrical pin 601 to prevent the cylindrical pin 601 connected between each contact finger piece from moving, thus playing a stop role. At the same time, it prevents the relative movement between adjacent groups of contact finger pieces from causing friction and generating metal shavings. In this way, the stop washer 701 forms an inter-group gap between the main contact finger groups, and the boss on the contact finger piece forms an intra-group gap between each group of main contact fingers.

[0091] In this embodiment, the first main contact finger piece 501 has a first mating surface 1203 with a straight segment, and correspondingly, the second main contact finger piece 502 has a second mating surface 1208 with a straight segment. The first mating surface 1203 and the second mating surface 1208 are used for the first group of main contact fingers 401 to mate with the inner cavity of the rear shield 201. The first main contact finger piece 501 also has a first arc surface 1205 and a second arc surface 1206 symmetrical about the first elongated hole 1202. The first arc surface 1205 is used for the first group of main contact fingers 401 to contact the first contact surface 1103 of the contact finger of the contact seat 203, and the second arc surface 1206 is used for the first group of main contact fingers 401 to contact the moving contact 101. The arc surface contact surface design ensures that the contact finger piece always maintains line contact with the contact seat or the moving contact during the movement, ensuring reliable current flow in the main circuit of the disconnecting switch.

[0092] like Figure 11 , 16 As shown, a first arc-initiating block 1303 is welded onto the first arc-initiating finger piece 801 to form a first arc-initiating finger 410, and a second arc-initiating block 1304 is welded onto the second arc-initiating finger piece 802 to form a second arc-initiating finger 417. The first arc-initiating finger 410 is provided with a first arc-initiating block 1303, a third elongated hole 1302 and a second round hole 1306, and the second arc-initiating finger 417 is provided with a second arc-initiating block 1304, a second round hole 1306 and a fourth elongated hole 1305, wherein the second round hole 1306 is used to install a cylindrical pin 601. In this embodiment, the first arc-inducing block 1303 and the second arc-inducing block 1304 have guide slopes that guide the moving contact into the space between the two sets of contact finger plates. Since the first arc-inducing contact finger 410 and the second arc-inducing contact finger 417 are symmetrically arranged along the boss of the contact seat 203, the first arc-inducing block 1303 and the second arc-inducing block 1304 are distributed in a figure-eight shape in their natural state. This arrangement is equivalent to increasing the entry angle of the moving contact and reducing the friction force of the moving contact at the initial moment of insertion into the stationary contact. At the same time, the arc-inducing block plays a role in resisting arc erosion and protecting the contact finger plates from being eroded.

[0093] like Figure 16 , 17As shown, the auxiliary contact finger sheet structure of the first auxiliary contact finger 411 and the second auxiliary contact finger 416 is provided. The auxiliary contact finger sheet is provided with an avoidance notch so that the upper part of the auxiliary contact finger forms a limiting arm for limiting. The limiting arm is provided with a first blocking surface 1401 and a second blocking surface 1405 respectively. A second round hole 1403, a fifth elongated round hole 1402 and a sixth elongated round hole 1406 are respectively provided in the middle. A third round boss 1404 is provided at one end. The first arc-inducing contact finger 410 is connected to the first auxiliary contact finger 411 by a cylindrical pin 601. The second arc-inducing contact finger 417 is connected to the second auxiliary contact finger 416 by cylindrical pins 601 respectively. After installation, the first arc-inducing block 1303 is stopped by the second blocking surface 1405, the second arc-inducing block 1304 is stopped by the first blocking surface 1401, and the third round boss 1404 is in close contact with the first support surface 1301.

[0094] In this embodiment, the first connecting screw 427 passes sequentially through the first fixing hole 1001 of the rear shield 201, the first elongated hole 1202 of the first main contact finger 501, the second elongated hole 1209 of the second main contact finger 502, the third elongated hole 1302 of the first arc-inducing contact finger 410, the fifth elongated hole 1402 of the first auxiliary contact finger 411, and the second fixing hole 1007 of the front shield 202. Then, the first connecting screw 427 is connected to the front shield 202 and the rear shield 201 through the second connecting bolt 415 and the third connecting bolt 428, respectively. The connection of the second connecting screw 430 is similar to that of the first connecting screw 427, and will not be described in detail here. In this way, each contact finger works within the space enclosed by the front shield, the rear shield, and the contact seat. This allows each contact finger to function naturally, with the contact point between the contact finger and the contact seat, and the contact point between the elongated hole on the contact finger and the connecting screw serving as support points. Simultaneously, a balanced force is maintained under the tension of the middle clamping spring, ensuring that the contact fingers located on both sides of the boss on the contact seat are in a unique position, facilitating the centered insertion of the moving contact into the stationary contact.

[0095] like Figure 12 As shown, in this embodiment, the movement of the contact finger of the stationary contact assembly is divided into two positions: the closing limit position 901 and the opening limit position 902, which correspond to... Figure 1 The stationary contact is in the closed state 103 and the stationary contact is in the open state 104.

[0096] During the busbar switching operation, before the moving contact 101 separates from the contact fingers of the stationary contact assembly 102, current mainly flows through the first group of main contact fingers 401 to the 18th group of main contact fingers 426; after the moving contact 101 separates from the first group of main contact fingers 401 to the 18th group of main contact fingers 426, the large current is drawn to the arc-starting contact fingers (801, 802) through the arc-starting blocks (1303, 1304) on the arc-starting contact fingers (410, 417). After the moving contact 101 separates from the arc-starting blocks (1303, 1304) on the arc-starting fingers (410, 417), an arc is generated. At this time, the arc burns the arc-starting blocks (1303, 1304) on the arc-starting fingers (410, 417). Since the material of the arc-starting blocks is resistant to high temperature and current impact, it can effectively reduce the arc burning of the contact finger pieces, thereby improving the ablation resistance of the stationary contact and extending the service life of the disconnecting switch.

[0097] Embodiment 2 of the disconnecting switch in this invention:

[0098] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the arc-initiating block is provided with a guide ramp. In this embodiment, the guide ramp may not be provided.

[0099] Embodiment 3 of the disconnecting switch in this invention:

[0100] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the shielding cover is connected by a long screw passing through a circular hole located in the middle of the contact seat boss. In this embodiment, the long screw is not required; instead, a bolt is used for direct connection by providing a threaded hole on the end face of the boss, further simplifying the structure.

[0101] An embodiment of the stationary contact assembly in this invention:

[0102] The stationary contact assembly in this embodiment has the same structure as the stationary contact assembly in any of the embodiments 1 to 3 of the disconnecting switch described above, and will not be described again here.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A stationary contact assembly, comprising a contact base, wherein the contact base has a boss extending along the insertion direction of the moving contact, with the insertion direction of the moving contact as the front-back direction, and contact finger groups symmetrically arranged on the left and right sides of the boss and connected in series by screws; a shielding cover is also fixed on the contact base, the contact finger groups are disposed inside the shielding cover, and tension springs are disposed between the oppositely arranged contact finger groups, characterized in that: The contact finger assembly has an arc-inducing block on the contact finger at one end into which the moving contact is inserted; the contact finger at the foremost end of the contact finger assembly is an auxiliary contact finger, which has an avoidance notch so that the upper part of the auxiliary contact finger forms a limiting arm for blocking and limiting the arc-inducing block; the arc-inducing block has a guide slope for guiding the moving contact into the space between the two contact finger assemblies.

2. The stationary contact assembly according to claim 1, characterized in that: The finger piece has at least two protrusions to form a gap between adjacent finger pieces.

3. The stationary contact assembly according to claim 2, characterized in that: The contact finger piece is provided with a tension spring connecting pin, the end of which is located within the gap, and the two ends of the tension spring are respectively connected to the ends of two tension spring cylindrical pins.

4. The stationary contact assembly according to claim 3, characterized in that: A stop washer is provided between adjacent contact finger pieces, and at least two stop pins are provided on the stop washer, one of which constitutes the tension spring connecting pin.

5. The stationary contact assembly according to claim 4, characterized in that: The stop washers and protrusions of each contact finger assembly are arranged alternately in the front-to-back direction.

6. The stationary contact assembly according to claim 1, characterized in that: Two shielding covers are provided, located on the front and rear sides of the contact base respectively, and a compression spring is provided between the shielding cover and the contact finger assembly.

7. The stationary contact assembly according to claim 6, characterized in that: The boss has a through fixing hole through which a screw is inserted to fix the shielding cover to the contact seat.

8. A disconnecting switch, comprising a housing, a stationary contact assembly, and a moving contact assembly, characterized in that: The stationary contact assembly is any one of the stationary contact assemblies described in claims 1 to 7.

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