Moving contact applying comb-shaped contact finger structure and clamp type disconnecting switch

Abstract

The invention discloses a moving contact applying a comb-shaped contact finger structure and a clamp type disconnecting switch, relates to the technical field of disconnecting switches, and is used for solving the problem that the existing clamp type disconnecting switch is concentrated due to clamping force or stress. The moving contact comprises a push plate, supporting pieces, a contact finger, a clamping spring and a mounting plate, the end part of the push plate is connected with one end of the supporting piece on the corresponding side through a connecting plate, the other end of the supporting piece is hinged with the mounting plate, one end of the supporting bent plate is hinged with the mounting plate, and the other end of the supporting bent plate is hinged with the clamping spring. The clamping spring is located between the supporting piece and the other end of the supporting bent plate. The two groups of contact fingers are symmetrically arranged between the two supporting bent plates, one end of each contact finger is fixedly connected with the supporting bent plate on the corresponding side, and the other end of each contact finger is in a comb tooth shape and is used for being in contact with a static contact; one end of the pressing plate is fixedly connected with the other end of the supporting bent plate, and the other end of the pressing plate is contacted with the other end of the contact finger from the inner side. Reliable clamping force exists between the clamping device and the static contact.

Description

Technical Field

[0001] The invention relates to the technical field of isolating switches, in particular to a movable contact and a clamp-type isolating switch using a comb-shaped contact finger structure. Background Art

[0002] The isolating switch is a switch device that is mainly used to isolate power supply, switch operation, connect and disconnect small current circuits, and has no arc extinguishing function. The contact between the contact and the finger of the isolating switch closes the circuit, and the separation of the contact and the finger of the isolating switch opens the circuit.

[0003] At present, there are two main types of clamp-type high-voltage disconnectors in the market. One is a single-column single-arm vertical telescopic disconnector, and the other is a double-column single-arm horizontal telescopic disconnector. The structures of the two are basically the same. The main components of the static contact are copper tubes, and the fingers of the moving contact are U-shaped copper plates or symmetrically arranged in a straight copper plate structure. For example, the double-column horizontal telescopic outdoor three-phase high-voltage AC disconnector with the authorization announcement number CN201387837Y, when closing the switch, the crank arm drives the connecting rod to move, so that the lower conductive tube is lifted, and the gear rack structure in the lower conductive tube makes the upper conductive tube move together. When the switch is closed to a certain position, the roller on the upper conductive tube contacts the inclined surface at the upper end of the gear support. As the closing action continues, the upper conductive tube is pushed upward, causing the moving contact piece to close. This structure relies on the clamping spring or the deformation of the contact finger itself to provide clamping force. This solution is short-line contact, but short-line contact will be affected by the processing and assembly processes. Its contact is difficult to reach the theoretical level, generally around 30%-50%, or even lower, causing clamping force or stress concentration. The clamping force or stress concentration will damage and destroy the silver plating at the pinching part of the switch after 500-3000 operations. There is a risk of heating or even burning when the switch is operated outdoors for a long time.

[0004] Based on the above problems, it is necessary to develop a high-performance isolating switch to significantly improve the current-carrying performance, wear resistance and stability of the isolating switch products. Summary of the invention

[0005] The object of the present invention is to provide a moving contact and a clamp-type disconnector using a comb-shaped contact finger structure, which are used to solve the problem that the silver plating layer of the pinching part of the existing clamp-type disconnector is damaged and heated and burned after long-term opening and closing operations due to the concentration of clamping force or stress.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a moving contact using a comb-shaped contact finger structure, including a push plate, a support member, a contact finger, a clamping spring and a mounting plate, wherein the support members are symmetrically arranged, and the two ends of the push plate correspond to the two support members one by one, and the end of the push plate is connected to one end of the support member on the corresponding side through a connecting plate, and also includes a support bent plate, a contact finger, a pressure plate and a soft connector, the other end of the support member is hinged to the mounting plate, the support bent plates are symmetrically arranged, and one end of the support bent plates is hinged to the mounting plate, and the clamping spring is located at the support member. and the other end of the supporting bent plate; the contact fingers are located between the two supporting bent plates and are symmetrically arranged in two groups, one end of the contact fingers is fixedly connected to the supporting bent plate on the corresponding side, and the other end of the contact fingers is in a comb tooth shape and is used to contact with the static contact; one end of the pressure plate is fixedly connected to the other end of the supporting bent plate, and the other end of the pressure plate contacts the other end of the contact fingers from the inside, and a contact finger spring is provided between the contact fingers and the supporting bent plate on the corresponding side; the soft connector has two groups, one end of the soft connector is fixedly connected to the contact fingers on the corresponding side, and the other end of the soft connector is electrically connected to the conductive arm on the disconnector.

[0007] Furthermore, each group of the contact fingers has at least one.

[0008] Furthermore, one end of the contact finger is in a "U"-shaped structure, and one end of the contact finger is fixedly connected to the mounting plate via a fixing plate; the other end of the contact finger has a plurality of strip-shaped notches so that the other end of the contact finger is in a comb-tooth shape.

[0009] Furthermore, one end of the finger spring is fixedly connected to the supporting bent plate, and the other end of the finger spring contacts the outer side of the finger; the pressure plate and the finger spring cooperate on the inner and outer sides of the finger to pre-press the finger.

[0010] Furthermore, the other end of the supporting bent plate is provided with a guide plate, and a conical space is formed between the two guide plates to facilitate the static contact to enter the moving contact.

[0011] Furthermore, one end of the finger spring has a first guide block, and the other end of the finger spring has a fixed clamping plate, the first guide block is fixedly connected or clamped to the inner side of the supporting bent plate, and the fixed clamping plate contacts the outer side of the finger.

[0012] Furthermore, one end of the clamping spring is fixedly connected to the support member, and the other end of the clamping spring has a second guide block, and the second guide block is fixedly connected or clamped to the outer side surface of the supporting bent plate.

[0013] Furthermore, the contact fingers are located on the inner side of the support bent plate, and the two opposite side surfaces of the support bent plate have insulating pads. When the static contact of the disconnector extends between the two groups of contact fingers, the insulating pads are located between the static contact and the moving contact to play an insulating role.

[0014] The present invention also discloses a clamp-type isolating switch, comprising a moving contact, an upper conductive arm, a lower conductive arm, a pedestal, a base, a transmission mechanism, a post insulator and an electric operating mechanism, wherein the moving contact is located at one end of the upper conductive arm, the other end of the upper conductive arm is rotatably connected to one end of the lower conductive arm, the other end of the lower conductive arm is rotatably connected to the base, the post insulator is rotatably mounted on the base, the electric operating mechanism is fixedly connected to the base to drive the rotation of the post insulator, the transmission mechanism is located between the post insulator and the other end of the lower conductive arm, and the rotational motion of the post insulator is converted into the rotational motion of the lower conductive arm relative to the base through the transmission mechanism.

[0015] Furthermore, the clamp-type disconnector is of horizontally telescopic type or vertically telescopic type.

[0016] The beneficial effects of the present invention are as follows: the movable contact of the present invention includes a contact finger of a comb-tooth structure. Compared with the short-line contact of the existing clamp-type contact finger, the contact length is increased and evenly distributed, which can ensure that the contact length of each short line is more than 90%, and the total contact line length after accumulation is greater than 90%; this makes the contact points more and the fault tolerance rate higher, and even if the flow of some contact points fails, the flow reliability can still be guaranteed, which better improves the flow performance of the contact fingers on the current market. The contact process between the contact finger and the static contact is divided into two steps. At the initial stage of the closing action, the static contact contacts the contact finger. The contact finger first clamps the static contact through its own deformation and the contact finger spring. The clamping force of the contact finger part can be reduced to 30%, ensuring reliable flow. When the contact finger is compressed to a certain value, the clamping spring provides a reliable clamping force, and the overall clamping force is maintained at 100%, thereby realizing the clamping characteristics of "flexibility first and rigidity later". The flexibility ensures the flow condition, and the rigidity ensures the dynamic thermal stability performance, which greatly reduces the risk of the electrical contact part being susceptible to short-circuit current. The clamping force at the contact point is evenly distributed, which improves the wear resistance of the silver-plated surface and enhances the operating life and stability of the product. The comb-shaped contact finger structure can effectively disperse the force and balance the current when subjected to large electric forces, greatly improving the dynamic thermal stability performance at a lower cost, and the dynamic thermal stability test performance can be improved by more than 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the movable contact of the present invention applied to a horizontal telescopic clamp-type isolating switch; Figure 2 for Figure 1 3D diagram of the open state of the horizontal telescopic clamp-type disconnector; Figure 3 for Figure 2 A local enlarged view of point A in FIG. Figure 4 It is a front view of the movable contact of the present invention applied to a vertical telescopic clamp-type isolating switch; Figure 5 for Figure 4 A three-dimensional diagram of the open state of the vertical telescopic clamp-type disconnector; Figure 6 for Figure 5 A local enlarged view of point B in FIG. Figure 7 It is a three-dimensional diagram of the moving contact and the stationary contact of the vertical telescopic clamp-type disconnector; Figure 8 It is a three-dimensional diagram of the moving contact and the stationary contact of the horizontal telescopic clamp-type disconnector; Fig. 9 It is a three-dimensional diagram of the moving contact; Fig.10 The three-dimensional diagram of the internal structure of the moving contact; Fig.11 for Fig.10 A local enlarged view of point C in FIG. Fig.12 A three-dimensional diagram of the touch finger; In the figure: 1 moving contact, 11 contact finger, 12 pressure plate, 121 pre-pressing part, 13 guide plate, 14 insulating pad, 15 push plate, 151 pushing part, 16 mounting plate, 17 soft connector, 18 support member, 19 connecting plate, 110 supporting bent plate, 111 clamping spring, 112 contact finger spring, 113 fixed card plate, 114 first guide block, 115 second guide block, 116 fixed plate, 117 first pin shaft, 118 second pin shaft, 119 third pin shaft, 2 upper conductive arm, 21 roller, 3 lower conductive arm, 31 conductive arm bracket, 32 gear box, 4 base, 41 crank arm shaft, 42 opening and closing crank arm, 43 connecting rod, 44 gear rod, 45 transmission crank arm, 46 hinge shaft, 5 static contact. DETAILED DESCRIPTION

[0018] like Figures 1 to 12 As shown, the moving contact 1 of the present invention includes a contact finger 11, a pressure plate 12, a guide plate 13, an insulating pad 14, a push plate 15, a mounting plate 16, a soft connector 17, a support member 18, a connecting plate 19, a supporting bent plate 110, a contact finger spring 111, a clamping spring 112, a fixed card plate 113, a first guide block 114, a second guide block 115, a fixed plate 116, a first pin 117, a second pin 118 and a third pin 119. The clamp-type disconnector of the present invention includes a moving contact 1, an upper conductive arm 2, a lower conductive arm 3, a base 4, a base, a transmission mechanism, a post insulator and an electric operating mechanism. The structure and working principle of the moving contact and the clamp-type disconnector of the present invention are described in detail below with reference to the accompanying drawings.

[0019] like Figures 1 to 12 As shown, a movable contact 1 using a comb-shaped contact finger structure includes a push plate 15, a support member 18, a contact finger 11, a clamping spring 112, a mounting plate 16, a support bent plate 110, a contact finger 11, a pressure plate 12 and a soft connector 17, as shown in FIG. Fig. 9 , Fig.10 As shown, there are two symmetrically arranged support members 18, the support members 18 are plate-shaped structures, the push plate 15 is a "]"-shaped structure, the two ends of the push plate 15 correspond to the two support members 18 one by one, and the two ends of the push plate 15 are located above the corresponding support members 18, the end of the push plate 15 is connected to one end of the support member 18 on the corresponding side through a connecting plate 19, and the other end of the support member 18 is hingedly connected to the mounting plate 16 through a first pin shaft 117. Specifically, one end of the connecting plate 19 is hingedly connected to the end of the push plate 15 on the corresponding side through a second pin shaft 118, and the other end of the connecting plate 19 is hingedly connected to one end of the support member 18 through a third pin shaft 119. The middle part of the push plate 15 has a protruding push portion 151, which is used to be fixedly connected to one end of the inner push rod in the upper conductive arm 2 of the disconnector. When the inner push rod moves axially relative to the upper conductive arm 2, it pushes the push plate 15 to move. The movement of the push plate 15 is transmitted to one end of the support member 18 through the second pin shaft 118, the connecting plate 19 and the third pin shaft 119, thereby driving one end of the support member 18 to rotate relative to the first pin shaft 117, and one ends of the two support members 18 are close to each other.

[0020] like Fig. 9 , Fig.10 As shown, the mounting plate 16 is a "convex" shaped structure, the large end of the mounting plate 16 is fixedly connected to the upper conductive arm 2 by bolts, the supporting bent plate 110 is two symmetrically arranged pieces, the supporting bent plate 110 is a "]" shaped structure, and one end of the supporting bent plate 110 is hingedly connected to the small end of the mounting plate 16 by a first pin shaft 117. Fig.10 , Fig.11 As shown, the clamping spring 111 is located between one end of the support member 18 and the other end of the support bent plate 110, and the clamping spring 111 has an inward pre-tightening force on the support bent plate 110. The contact fingers 11 are located between the two support bent plates 110 and are symmetrically arranged in two groups. One end of the contact finger 11 is fixedly connected to the support bent plate 110 on the corresponding side, and the other end of the contact finger 11 is in a comb-tooth shape and is used to contact the static contact. Specifically, each group of contact fingers 11 has at least one, and each group of the present invention includes two contact fingers 11, and the entire moving contact 1 includes four contact fingers 11. The contact fingers 11 are located on the inner side of the support bent plate 110. When each group of contact fingers 11 has multiple contact fingers 11, the multiple contact fingers 11 are coplanar and evenly arranged. As shown Fig.12As shown, one end of the contact finger 11 is in a "U"-shaped structure, and one end of the contact finger 11 is fixedly connected to the mounting plate 16 through a fixing plate 116; during installation, a bolt is inserted between one end of the contact finger 11, the fixing plate 116 and the mounting plate 16 to achieve relative fixation of the three. Therefore, a circular mounting hole is provided at one end of the contact finger 11, and the other end of the contact finger 11 has a plurality of strip-shaped notches so that the other end of the contact finger 11 is in a comb-tooth shape. The notches are arranged at equal intervals, so that the length and width of the comb teeth at the other end of the contact finger 11 are equal. The contact finger 11 is a sheet metal part obtained by bending. In the embodiment of the present invention, six notches are provided, so that the other end of the contact finger 11 is divided into seven equal parts. The number of notches can also be other numbers, which depends on the voltage level and the use environment.

[0021] like Fig. 9 As shown, the pressing plate 12 is also a sheet metal part. The pressing plate 12 includes three sections, including a mounting section, a connecting section and a pre-pressing portion 121 arranged in sequence. The mounting section is arranged in parallel with the pre-pressing portion 121. The mounting section of the pressing plate 12 is fixedly connected to the other end of the supporting bent plate 110 by bolts. The pre-pressing portion 121 of the pressing plate 12 contacts the inner side surface of the other end of the contact finger 11 to press the contact finger 11 from the inside. Fig.10 , Fig.11 As shown, a finger spring 112 is provided between the contact finger 11 and the supporting curved plate 110 on the corresponding side. One end of the finger spring 112 is fixedly connected to the supporting curved plate 110, and the other end of the finger spring 112 contacts the outer side of the contact finger 11, and the finger spring 112 presses the contact finger 11 from the outer side. The pressing plate 12 and the finger spring 112 cooperate on the inner and outer sides of the contact finger 11 to pre-press the contact finger 11. To facilitate the assembly of the finger spring 112, one end of the finger spring 112 has a first guide block 114, and the other end of the finger spring 112 has a fixed clamping plate 113. The first guide block 114 is fixedly connected or clamped to the inner side surface of the supporting curved plate 110, and the fixed clamping plate 113 contacts the outer side surface of the contact finger 11. In this way, the finger spring 112 is located between the contact finger 11 and the supporting curved plate 110. In the embodiment of the present invention, two finger springs 112 are provided between each fixed clamping plate 113 and the supporting curved plate 110.

[0022] like Fig.10 , Fig.11 As shown, to facilitate the assembly of the clamping spring 111, one end of the clamping spring 111 is fixedly connected to the support member 18, and the other end of the clamping spring 111 has a second guide block 115, and the second guide block 115 is fixedly connected or clamped to the outer side of the support bent plate 110. In this way, the clamping spring 111 is located between the support member 18 and the support bent plate 110.

[0023] like Fig. 9As shown, there are two groups of flexible connectors 17, and the mounting plate 16 is located between the two groups of flexible connectors 17. One end of the flexible connector 17 is fixedly connected to one end of the contact finger 11 on the corresponding side through a fixing plate 116, as shown in FIG. Figure 8 As shown, the other end of the flexible connector 17 is electrically connected to the upper conductive arm 2 of the disconnector.

[0024] like Fig. 9 As shown, in order to facilitate the static contact to enter the moving contact 1, that is, to enter between the two sets of contact plates 11, a guide plate 13 is fixed at the other end of the support bent plate 110, and a conical space is formed between the two guide plates 13 to facilitate the static contact to enter the moving contact 1. The two guide plates 13 can be arranged in an "eight" shape, or a bevel can be set on the opposite side of the two guide plates 13 to achieve the purpose of the two guide plates 13 surrounding the conical space.

[0025] To achieve insulation between the support bent plate 110 and the stationary contact, as Fig. 9 As shown, the two opposite sides of the support bent plate 110 are provided with insulating pads 14. When the stationary contact of the disconnector extends between the two groups of contact fingers 11, the insulating pads 14 are located between the stationary contact and the moving contact 1 to play an insulating role.

[0026] A clamp-type isolating switch according to the present invention, Figures 1 to 8 As shown, it includes a moving contact 1, an upper conductive arm 2, a lower conductive arm 3, a base 4, a base, a transmission mechanism, a post insulator and an electric operating mechanism. The moving contact 1 is located at one end of the upper conductive arm 2. Figure 7 , Figure 8 As shown, the flexible connector 17 of the moving contact 1 is electrically connected to the upper conductive arm 2, as shown in FIG. Figure 8 As shown, the mounting plate 16 of the moving contact 1 is fixedly connected to the upper conductive arm 2, and the push plate 11 of the moving contact 1 is fixedly connected to the inner push rod in the upper conductive arm 2. The other end of the upper conductive arm 2 is rotatably connected to one end of the lower conductive arm 33, as shown in FIG. Figure 2 As shown, one end of the lower conductive arm 33 has a gear box 32, and a gear is rotatably mounted in the gear box 32. The other end of the upper conductive arm 2 is coaxially arranged with the gear. In this way, when the gear rotates, the upper conductive arm 2 is driven to rotate relative to the lower conductive arm 3. The other end of the lower conductive arm 3 is rotatably connected to the base 4. Specifically, as shown in FIG. Figure 2 , Figure 4 and Figure 5 As shown, the other end of the lower conductive arm 3 has a conductive arm bracket 31, and the conductive arm bracket 31 is rotatably connected to the base 4 through a hinge shaft 46. The post insulator is rotatably mounted on the base, and the electric operating mechanism is fixedly connected to the base to drive the rotation of the post insulator. The transmission mechanism is located between the post insulator and the other end of the lower conductive arm 3. The rotational motion of the post insulator is converted into the rotational motion of the lower conductive arm 3 relative to the base 4 through the transmission mechanism. The base, the electric operating mechanism and the post insulator are all prior art and will not be described in detail. Figure 2 , Figure 4 and Figure 5 As shown, the transmission mechanism includes a crank arm shaft 41, a switching crank arm 42, a connecting rod 43, a gear rod 44 and a transmission crank arm 45. The crank arm shaft 41 is rotatably mounted on the base 4 and fixedly connected to the upper end of the supporting insulator. One end of the switching crank arm 42 is rotatably connected to the crank arm shaft 41, and the other end of the switching crank arm 42 is hinged to one end of the transmission crank arm 45. The other end of the transmission crank arm 45 is fixedly connected to the hinge shaft 46. The working principle of the transmission mechanism is described below: the rotation of the supporting insulator is driven by the electric operating mechanism, which in turn drives the rotation of the crank arm shaft 41. The rotation of the crank arm shaft 41 drives the rotation of the switching crank arm 42, which in turn pulls or pushes the rotation of the transmission crank arm 45 through the connecting rod 43, which in turn drives the rotation of the hinge shaft 46, and then drives the rotation of the lower conductive arm 3 relative to the base 4. As shown Figure 1 As shown, the lower conductive arm 3 has a gear rod 44, one end of the gear rod 44 extends out of the lower conductive arm 3 and is hinged to the base, and the other end of the gear rod 44 has a rack and meshes with the gear in the gear box. In this way, when the lower guide arm 3 rotates relative to the base 4, the gear rod 44 moves axially relative to the lower conductive arm 3, and then the rack drives the gear to rotate, thereby realizing the rotation of the upper conductive arm 2 relative to the lower conductive arm 3. That is, under the action of the transmission mechanism, when the lower guide arm 3 rotates relative to the base 4, the upper conductive arm 2 also rotates relative to the lower conductive arm 3, thereby realizing horizontal or vertical extension. Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, a roller 21 is provided at the other end of the upper conductive arm 2, and the roller 21 is rotatably mounted on the end of the other end of the inner push rod located in the upper conductive arm 2. When the switch is closed, the lower conductive arm 3 rotates relative to the base 4, and the upper conductive arm 2 rotates relative to the lower conductive arm 3. The rotation trend is to make the lower guide arm 3 parallel to the base 4, and the upper conductive arm 2 parallel to the lower conductive arm 3. When the upper conductive arm 2 and the lower conductive arm 3 are about to be parallel, the gear box at one end of the lower conductive arm 3 contacts the roller 21 and squeezes the roller 21, thereby realizing the axial movement of the inner push rod relative to the upper conductive arm 2, and then pushing the push plate 15 to move. When the push plate 15 moves, the support member 18 is driven to move through the connecting plate 19.

[0027] like Figures 1 to 3 As shown, the clamp-type isolating switch of the present invention can be a horizontal telescopic clamp-type isolating switch. Figures 4 to 6 As shown, the clamp-type disconnector of the present invention can also be a vertical telescopic clamp-type disconnector, that is, the movable contact 1 of the present invention can be applied to both horizontal telescopic clamp-type disconnectors and vertical telescopic clamp-type disconnectors.

[0028] The working principle of the isolating switch of the present invention is described below: (1) Closing: The electric operating mechanism drives the post insulator to rotate. The rotational motion of the post insulator is transmitted to the lower conductive arm 3 through the transmission mechanism, thereby causing the lower conductive arm 3 to rotate relative to the base 4, and the upper conductive arm 2 to rotate relative to the lower conductive arm 3, thereby causing the upper conductive arm 2 and the lower conductive arm 3 to extend. When the upper conductive arm 2 is about to be parallel to the lower conductive arm 3, the gear box squeezes the roller 21 so that the roller 21 climbs the slope and drives the inner push rod to move, thereby moving the push plate 15, and driving the support member 18 to rotate relative to the first pin 117 through the connecting plate 19. At this time, the clamping spring 111 transmits force to the support bent plate 110, the contact finger spring 112 is compressed, and the contact finger 11 undergoes a deformation of about 3 mm along its own thickness direction, thereby providing a contact clamping force between the contact finger 11 and the stationary contact 5. The movable contact of the present invention is provided with four contact fingers 11, and two contact finger springs 112 are arranged between each contact finger 11 and the supporting bent plate 110, so that the contact finger 11 can provide a clamping force of about 300N when closing the switch, so as to achieve contact priority to ensure current flow.

[0029] (2) There is a gap of 3 mm between the contact finger 11 and the insulating pad 14. As the closing operation is further advanced, the contact finger 11 deforms about 3 mm along its thickness direction and then stops deforming due to the obstruction of the insulating pad 14. Subsequently, the support 18 pushes the clamping spring 111 to compress and deform. When the closing operation is completed, the clamping spring 111 compresses and deforms to generate a clamping force of about 700 N. This clamping force enables the insulating pad 14 to maintain reliable contact with the static contact 5. At the same time, the insulating pad 14 prevents the contact finger from shunting.

[0030] (3) Compared with the traditional contact finger structure that needs to provide a 1000N clamping force and all acts on the contact finger, the contact finger 11 of the present invention preferentially contacts the static contact 5 to ensure current flow, and provides a reliable clamping force with the clamping spring 111, realizing the clamping characteristics of "flexibility first and rigidity later". The partial clamping force of the contact finger 11 is reduced to 30%, while the overall clamping force can still be maintained at 100%. The significant reduction in the clamping force of the contact finger 11 will effectively protect the silver-plated layer on the surface of the contact finger 11 and the static contact 5, improve the wear resistance, and greatly increase the life of the electrical contact part. The overall clamping force is maintained at 100%, which can also ensure the dynamic thermal stability of the disconnector and greatly reduce the risk of the electrical contact part being susceptible to short-circuit current.

[0031] (4) Compared with the traditional contact finger structure, the contact length of the contact finger 11 of the present invention is effectively improved and evenly distributed, which can ensure that the contact length of each short line is more than 90%, and the total contact line length after accumulation is greater than 90%. This makes the contact points more and the fault tolerance rate higher. Even if some of the contact points fail to flow, the flow reliability can still be guaranteed, which better improves the flow performance of the contact fingers currently on the market.

[0032] (5) The contact finger 11 of the present invention can effectively disperse the force when the contact part between the static contact 5 and the contact finger 11 is subjected to a large electric force, balance the current, and greatly improve the dynamic thermal stability test performance. The dynamic thermal stability test performance of the clamp-type disconnector using the contact finger 11 structure can be improved by more than 30%.

[0033] The movable contact of the present invention includes a contact finger of a comb-tooth structure. Compared with the short-line contact of the existing clamp-type contact finger, the contact length is increased and evenly distributed, which can ensure that the contact length of each short line is more than 90%, and the total contact line length after accumulation is greater than 90%; this makes the contact points more and the fault tolerance rate higher. Even if the flow of current at some contact points fails, the flow reliability can still be guaranteed, which better improves the flow performance of the contact fingers on the current market. The contact process between the contact finger and the static contact is divided into two steps. At the initial stage of the closing action, the static contact contacts the contact finger. The contact finger first clamps the static contact through its own deformation and the contact finger spring. The clamping force of the contact finger part can be reduced to 30%, ensuring reliable flow. When the contact finger is compressed to a certain value, the clamping spring provides a reliable clamping force, and the overall clamping force is maintained at 100%, thereby realizing the clamping characteristics of "flexibility first and rigidity later". The flexibility ensures the flow condition, and the rigidity ensures the dynamic thermal stability performance, which greatly reduces the risk of the electrical contact part being susceptible to short-circuit current. The clamping force at the contact point is evenly distributed, which improves the wear resistance of the silver-plated surface and enhances the operating life and stability of the product. The comb-shaped contact finger structure can effectively disperse the force and balance the current when subjected to large electric forces, greatly improving the dynamic thermal stability performance at a lower cost, and the dynamic thermal stability test performance can be improved by more than 30%.

Claims

1. A moving contact using a comb-shaped contact finger structure, comprising a push plate, a support member, a contact finger, a clamping spring and a mounting plate, wherein the support members are two symmetrically arranged, the two ends of the push plate correspond to the two support members one by one, and the end of the push plate is connected to one end of the support member on the corresponding side through a connecting plate, characterized in that: It also includes a support bent plate, a contact finger, a pressure plate and a soft connector, the other end of the support member is hinged to the mounting plate, the support bent plates are two symmetrically arranged, one end of the support bent plates is hinged to the mounting plate, and the clamping spring is located between the support member and the other end of the support bent plates; the contact fingers are two groups located between the two support bent plates and symmetrically arranged, one end of the contact fingers is fixedly connected to the support bent plates on the corresponding side, and the other end of the contact fingers is in a comb tooth shape and is used to contact with the static contact; one end of the pressure plate is fixedly connected to the other end of the support bent plate, and the other end of the pressure plate contacts with the other end of the contact fingers from the inside, and a contact finger spring is provided between the contact fingers and the support bent plates on the corresponding side; the soft connector has two groups, one end of the soft connector is fixedly connected to the contact fingers on the corresponding side, and the other end of the soft connector is electrically connected to the conductive arm on the disconnector.

2. A moving contact using a comb-shaped contact finger structure according to claim 1, characterized in that: Each group of the contact fingers has at least one contact finger.

3. The movable contact using a comb-shaped contact finger structure according to claim 1, characterized in that: One end of the contact finger is in a "U" shape, and one end of the contact finger is fixedly connected to the mounting plate through a fixing plate; the other end of the contact finger has a plurality of strip-shaped notches so that the other end of the contact finger is in a comb-tooth shape.

4. The movable contact using a comb-shaped contact finger structure according to claim 1, characterized in that: One end of the finger spring is fixedly connected to the supporting bent plate, and the other end of the finger spring contacts the outer side of the finger; the pressure plate and the finger spring cooperate on the inner and outer sides of the finger to pre-press the finger.

5. The movable contact using a comb-shaped contact finger structure according to claim 1, characterized in that: The other end of the supporting bent plate is provided with a guide plate, and a conical space is formed between the two guide plates to facilitate the static contact to enter the moving contact.

6. The movable contact using a comb-shaped contact finger structure according to claim 1, characterized in that: One end of the finger spring has a first guide block, and the other end of the finger spring has a fixed clamping plate. The first guide block is fixedly connected or clamped to the inner side of the supporting bent plate, and the fixed clamping plate contacts the outer side of the finger.

7. A moving contact using a comb-shaped contact finger structure according to claim 6, characterized in that: One end of the clamping spring is fixedly connected to the support member, and the other end of the clamping spring has a second guide block, and the second guide block is fixedly connected or clamped to the outer side surface of the supporting bent plate.

8. The movable contact using a comb-shaped contact finger structure according to claim 1, characterized in that: The contact fingers are located on the inner side of the support bent plate, and the two opposite side surfaces of the support bent plate are provided with insulating pads. When the static contact of the isolating switch extends between the two groups of the contact fingers, the insulating pads are located between the static contact and the moving contact to play an insulating role.

9. A clamp-type disconnector comprising a movable contact with a comb-shaped contact finger structure as claimed in any one of claims 1 to 8, characterized in that: It also includes an upper conductive arm, a lower conductive arm, a pedestal, a base, a transmission mechanism, a support insulator and an electric operating mechanism. The soft connector of the moving contact is electrically connected to the upper conductive arm, and the mounting plate of the moving contact is fixedly connected to the upper conductive arm.

10. A moving contact using a comb-shaped contact finger structure according to claim 9, characterized in that: The clamp-type isolating switch is a horizontal telescopic type or a vertical telescopic type.

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