Split-and-combined load switch

Abstract

The utility model discloses a split and combined load switch, which comprises a switch frame, a bus mounting shaft and an isolation rotating shaft are arranged on the switch frame, an isolation knife is fixed on the isolation rotating shaft, a conductor is mounted on the bus mounting shaft, the upper end of the conductor is connected with a wire inlet busbar, the upper half part of the wire inlet busbar is bent forwards, and the lower half part of the wire inlet busbar is bent forwards. The lower end of the electric conductor is connected with an isolation static contact, a vacuum arc-extinguishing chamber is installed in the middle of the electric conductor, a static conducting rod of the vacuum arc-extinguishing chamber is connected with the electric conductor, a supporting frame is fixed to a movable end cover of the vacuum arc-extinguishing chamber, a first supporting shaft is rotationally arranged on the supporting frame, and a crank arm shifting piece matched with an isolation knife in a shifting mode is fixed to the first supporting shaft. The crank arm plectrum is connected with the movable conducting rod through flexible connection, a pull rod is arranged on the movable conducting rod, a cam assembly is installed on the first supporting shaft, and the cam assembly and the pull rod are in transmission fit to control opening and closing of the vacuum arc-extinguishing chamber. According to the utility model, arc-extinguishing operation can be carried out through the vacuum arc-extinguishing chamber when the isolation knife is switched on and switched off, and the operation safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and more specifically, it is a split-connected load switch. Background Technology

[0002] Existing load switches suffer from the following main problems during arc extinguishing during opening and closing: First, traditional arc-extinguishing media (such as air, oil, or SF6) have limited arc-extinguishing capabilities under high-voltage, high-current conditions, easily leading to arc reignition or excessively long arc extinguishing times, potentially causing equipment overheating, contact erosion, or even short-circuit accidents. Second, some load switches have unreasonable arc-extinguishing chamber designs, resulting in uneven airflow or electric field distribution, weakening arc-extinguishing efficiency. Especially during frequent operation, contact wear is accelerated, further reducing arc-extinguishing performance. Furthermore, insufficient stability of the operating mechanism can cause fluctuations in opening and closing speeds, affecting the rapid extinguishing of the arc and potentially generating overvoltages, threatening equipment insulation safety. Some non-vacuum load switches also suffer from aging, leakage, or environmental issues related to the arc-extinguishing media (such as the greenhouse effect of SF6), requiring regular maintenance and replacement, increasing operating costs. These problems limit the breaking capacity and service life of load switches, especially in high-voltage, high-frequency power systems, where arc-extinguishing reliability and operational safety of the switches urgently need improvement. Utility Model Content

[0003] To address the technical problem of low operational safety caused by arc extinguishing issues in existing load switches, this utility model innovatively provides a combined opening and closing load switch. This switch allows for arc extinguishing via a vacuum arc-extinguishing chamber during both opening and closing of the isolating switch. It also boasts advantages such as strong arc extinguishing capability, high safety performance, long energized service life, large breaking current, significantly increased breaking frequency, large closing current, significantly increased closing frequency, small size, and simple structure.

[0004] To achieve the aforementioned technical objectives, this utility model discloses a split-connected load switch, comprising a switch frame. From top to bottom, the switch frame is equipped with a busbar mounting shaft and an isolation rotating shaft. An isolation blade is fixed on the isolation rotating shaft. A conductor is mounted on the busbar mounting shaft. The upper end of the conductor is connected to an incoming busbar, the upper half of which is bent forward. The lower end of the conductor is connected to an isolation stationary contact that cooperates with the isolation blade. A vacuum interrupter is mounted in the middle of the conductor. The stationary conductive rod of the vacuum interrupter is connected to the conductor. A support frame is fixed on the moving end cover of the vacuum interrupter. A first support shaft is rotatably mounted on the support frame. A crank arm lever, cooperating with the isolation blade, is fixed on the first support shaft. The crank arm lever is connected to the moving conductive rod of the vacuum interrupter via a flexible connection. A pull rod is mounted on the moving conductive rod. A cam assembly is also mounted on the first support shaft. The cam assembly and the pull rod drive each other to control the opening and closing of the vacuum interrupter.

[0005] Furthermore, this utility model discloses a split-connected load switch, wherein the pull rod is provided with an end cap and a limiting sleeve, and a limiting ring platform is provided in the middle of the pull rod. The end cap is sleeved on the pull rod behind the limiting ring platform, and the limiting sleeve is sleeved on the pull rod in front of the limiting ring platform and connected to the end cap. The interior of the limiting sleeve is provided with an assembly hole and a limiting guide hole from back to front. The assembly hole and the limiting guide hole are connected. The diameter of the assembly hole is larger than the diameter of the limiting guide hole, so that a limiting platform is formed inside the limiting sleeve. The free end of the pull rod is inserted into the limiting guide hole of the limiting sleeve. A contact spring is also sleeved on the pull rod. One end of the contact spring abuts against the limiting ring platform, and the other end of the contact spring abuts against the limiting platform inside the limiting sleeve. The cam assembly is driven by the pull rod through the limiting sleeve.

[0006] Furthermore, this utility model discloses a split-connected load switch, wherein the cam assembly includes a cam, a reversing block, and a reversing spring. The cam has a first mounting hole in its middle, and the cam is rotatably sleeved on a first support shaft through the first mounting hole. The cam drives a limiting sleeve to move linearly. The upper half of the cam has a mounting groove, and the groove of the mounting groove of the cam communicates with the first mounting hole. The reversing block is rotatably installed in the mounting groove of the cam. The lower end of the reversing block is symmetrically provided with a first reversing arm and a second reversing arm. The first reversing arm, the second reversing arm, and the reversing block form an inverted Y-shaped structure. The first support shaft is provided with a first wedge groove and a second wedge groove that match the first reversing arm and the second reversing arm, respectively. A lever is provided on the outer peripheral wall of the first support shaft between the first wedge groove and the second wedge groove. The reversing spring is installed between the bottom of the mounting groove of the cam and the reversing block.

[0007] Furthermore, this utility model provides a split-connected load switch, wherein the depth of the first wedge groove is less than the depth of the second wedge groove, and the toggle block is away from the opening of the first wedge groove and close to the opening of the second wedge groove.

[0008] Furthermore, this utility model discloses a split-connected load switch, wherein the mounting groove has a mounting post in the middle of the groove wall, the commutator block has a second mounting hole in the middle, the commutator block is rotatably sleeved on the mounting post through the second mounting hole, the upper end of the commutator block has a fixing post, the lower end of the commutator spring is fixedly sleeved on the fixing post, and the upper end of the commutator spring abuts against the bottom of the mounting groove of the cam.

[0009] Furthermore, this utility model discloses a split-connected load switch, wherein the support frame includes a base plate, a first upright plate, and a second upright plate. The base plate is fixedly connected to the movable cover plate of the vacuum interrupter. The first upright plate is fixed on the left side of the base plate, and the second upright plate is fixed on the right side of the base plate. A first support shaft is rotatably disposed between the first upright plate and the second upright plate. A limit plate is fixed on the first support shaft between the first upright plate and the cam. The front side of the limit plate is provided with a first bent plate that bends toward the first upright plate, and the front side of the support frame is provided with a second bent plate that bends toward the limit plate. The first bent plate and the second bent plate are stacked one after the other. A torsion spring is sleeved on the first support shaft between the first upright plate and the limit shaft, and the first bent plate and the second bent plate are located between the two torsion feet of the torsion spring.

[0010] Furthermore, this utility model provides a split-connected load switch, wherein the lower side of the base plate is provided with an upwardly bent baffle, which cooperates with the crank arm lever to stop.

[0011] Furthermore, this utility model discloses a split-connected load switch, wherein a second support shaft is fixed between the first vertical plate and the second vertical plate, the second support shaft is located behind the first support shaft, and a transmission crank arm is rotatably provided on the second support shaft. The transmission crank arm is provided with a lower crank arm extending downward and a front crank arm extending forward. The lower crank arm is hinged to a limiting sleeve. The cam is provided with an upper protrusion and a lower protrusion from top to bottom on the side facing the crank arm. The upper protrusion is press-fitted with the front crank arm, and the lower protrusion is press-fitted with the limiting sleeve.

[0012] Furthermore, this utility model provides a split-connected load switch, wherein the limiting sleeve is provided with a push rod, the rear side of the cam is provided with a cam groove, the push rod is disposed in the cam groove and slides in cooperation with the cam, the cam groove includes a first arc groove and a second arc groove, the first arc groove and the second arc groove are connected, the first arc groove is located on the upper side of the second arc groove, the first arc groove is arranged in front, and the second arc groove is arranged in rear.

[0013] Furthermore, this utility model provides a split-connected load switch, wherein a grounding support shaft is installed on the switch frame on the lower side of the isolating shaft, and a grounding contact that cooperates with the isolating blade is installed on the grounding support shaft.

[0014] The difference between this utility model and the prior art lies in the following: This utility model features a switch frame with a busbar mounting shaft and an isolation rotating shaft. An isolation blade is fixed on the isolation rotating shaft. A conductor is mounted on the busbar mounting shaft, with an incoming busbar connected to its upper end. The upper half of the incoming busbar is bent forward. An isolation stationary contact is connected to the lower end of the conductor. A vacuum interrupter is installed in the middle of the conductor, with its stationary conductive rod connected to the conductor. A support frame is fixed to the moving end cover of the vacuum interrupter, and a first support shaft is rotatably mounted on the support frame. A [missing information - likely a device or component] is fixed on the first support shaft. The isolating switch is actuated by a crank arm lever, which is connected to a moving conductive rod via a flexible connection. The moving conductive rod is equipped with a pull rod, and a cam assembly is mounted on the first support shaft. The cam assembly and the pull rod drive each other to control the opening and closing of the vacuum interrupter. This constitutes a load switch that can perform arc extinguishing operations through the vacuum interrupter when the isolating switch is closed or opened. It also has the advantages of strong arc extinguishing capability, high safety performance, long working life, large breaking current, significantly increased breaking number, large closing current, significantly increased closing number, small size, and simple structure. In practical use, when the isolating switch is closed, the isolating switch rotates in the first rotation direction, causing the crank arm to move and the cam assembly to close the vacuum interrupter. Immediately afterward, the isolating switch, the crank arm, and the stationary isolating contact simultaneously come into contact. Then, the isolating switch and the stationary isolating contact are in close contact, and the isolating switch separates from the crank arm. When the isolating switch is opened, the isolating switch rotates in the second rotation direction, simultaneously contacting the crank arm and the stationary isolating contact. After the isolating switch and the stationary isolating contact separate, the crank arm is moved again and the cam assembly is used to open the vacuum interrupter. The isolating switch then separates from the crank arm. By connecting the vacuum interrupter in parallel with the main circuit, the arc is extinguished through the vacuum interrupter during both opening and closing processes, thus preventing damage to the isolating switch. Because the conduction time between the vacuum interrupter and the main circuit is extremely short, compared to existing vacuum interrupters connected in series with the main circuit, the vacuum interrupter in this invention can be simplified and is smaller in size. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of a split-connected load switch according to the present invention;

[0016] Figure 2 for Figure 1 A partially enlarged structural diagram of section A in the middle;

[0017] Figure 3 for Figure 2 Cross-sectional structural diagram of a partial part

[0018] Figure 4 An exploded view of the structure for installing the various components of the support;

[0019] Figure 5 This is a schematic diagram of the structure in the initial state before closing the circuit breaker;

[0020] Figure 6 This is a schematic diagram of the vacuum interrupter when it is in a closed state during closing.

[0021] Figure 7 This is a schematic diagram showing the structure in which the isolating knife, isolating stationary contact, and crank arm lever are in contact simultaneously when the circuit is closed, and the contact spring is in a compressed state.

[0022] Figure 8 A schematic diagram of the structure after the closing operation is completed and the torsion spring returns to its original state (which is also the initial state of the opening operation);

[0023] Figure 9 This is a schematic diagram showing the structure in which the isolating knife, isolating stationary contact, and crank arm lever are in contact simultaneously during the tripping process.

[0024] Figure 10 This is a schematic diagram showing the structure where the isolating knife is separated from the isolating stationary contact when the circuit is open.

[0025] Figure 11 This is a schematic diagram of the vacuum interrupter chamber being in the open state when the circuit is tripped.

[0026] Figure 12 This is a schematic diagram of the structure after the circuit breaker is opened and the torsion spring returns to its original state (which is also the initial state when the circuit breaker is closed);

[0027] Figure 13 This is a schematic diagram of the structure of a split-connected load switch of this utility model when it is tripped;

[0028] Figure 14 for Figure 13 A magnified schematic diagram of a portion of section B in the middle;

[0029] Figure 15 This is a schematic diagram of the structure of a split-connected load switch of this utility model when it is closed;

[0030] Figure 1-12 It is a crank arm cam connection structure. Figure 13-15 It is a track cam connection structure. Detailed Implementation

[0031] The following is a detailed explanation and description of a split-connected load switch of this utility model, with reference to the accompanying drawings.

[0032] like Figure 1-3 As shown, this utility model embodiment discloses a split-connected load switch, including...

[0033] The system includes a switch frame 1. From top to bottom, the switch frame 1 has a busbar mounting shaft 2 and an isolating shaft 3. An isolating blade 4 is fixed on the isolating shaft 3. A conductor 21 is mounted on the busbar mounting shaft 2. The upper end of the conductor 21 is connected to an incoming busbar 22, the upper half of which is bent forward for easy connection to the high-voltage busbar. The lower end of the conductor 21 is connected to an isolating stationary contact 23 that cooperates with the isolating blade 4. A vacuum interrupter 5 is mounted in the middle of the conductor 21. The stationary conductive rod 51 of the vacuum interrupter 5 is connected to the conductor 21. A support frame 6 is fixed on the moving end cover 52 of the vacuum interrupter 5. A first support shaft 61 is rotatably mounted on the support frame 6. A crank arm 62 that cooperates with the isolating blade 4 is fixed on the first support shaft 61. The crank arm 62 is connected to the moving conductive rod 53 of the vacuum interrupter 5 via a flexible connection 63. The moving conductive rod 53 is equipped with a pull rod 64, and the first support shaft 61 is also equipped with a cam 71 assembly 7. The cam 71 assembly 7 and the pull rod 64 are in a transmission cooperation to control the opening and closing of the vacuum interrupter 5.

[0034] In actual use, when the isolating switch 4 is closed, it rotates in the first rotation direction, causing the crank arm lever 62 to close via the cam 71 assembly 7. Immediately afterward, the isolating switch 4 contacts the crank arm lever 62 and the isolating stationary contact 23 simultaneously. Then, the isolating switch 4 and the isolating stationary contact 23 are in close contact, and the isolating switch 4 separates from the crank arm lever 62. When the isolating switch 4 is open, it rotates in the second rotation direction, contacting the crank arm lever 62 and the isolating stationary contact 23 simultaneously. After separating from the isolating stationary contact 23, the isolating switch 4 continues...

[0035] The crank arm lever 62 is then moved via cam 71 assembly 7 to disconnect the vacuum interrupter 5, immediately separating the isolating blade 4 from the crank arm lever 62. In this example, the first rotation direction is counterclockwise, and the second rotation direction is clockwise. By adopting the above structure to connect the vacuum interrupter 5 in parallel with the main circuit, the arc is extinguished through the vacuum interrupter 5 during both opening and closing processes, thus preventing damage to the isolating blade 4. Because the conduction time between the vacuum interrupter 5 and the main circuit is extremely short, compared with the existing vacuum interrupter 5 connected in series with the main circuit, the vacuum interrupter 5 in this embodiment can be simplified and is smaller in size. It also has strong arc extinguishing capability, high safety performance, long energized working life, large breaking current, and a significantly increased number of breaking cycles.

[0036] It has advantages such as increased switching current, significantly increased switching frequency, small size, and simple structure.

[0037] like Figure 2 and combined Figure 3As shown, in one embodiment of this utility model, the pull rod 64 is provided with an end cap 641 and a limiting sleeve 642, and a limiting ring platform 643 is provided in the middle of the pull rod 64. The end cap 641 is sleeved on the pull rod 64 behind the limiting ring platform 643, and the limiting sleeve 642 is sleeved on the pull rod 64 in front of the limiting ring platform 643 and connected to the end cap 641. The limiting sleeve 642 can be fitted with the end cap 641.

[0038] The components are connected by a threaded connection. The interior of the limiting sleeve has, from back to front, a mounting hole 6422 and a limiting guide hole 6421. The mounting hole 6422 and the limiting guide hole 6421 are connected, and the diameter of the mounting hole 6422 is larger than the diameter of the limiting guide hole 6421, forming a limiting platform 6423 inside the limiting sleeve. The free end of the pull rod 64 is inserted into the limiting guide hole 6421 of the limiting sleeve. A contact spring 644 is also fitted on the pull rod 64, with one end of the contact spring abutting against the limiting ring platform 643.

[0039] The other end of the spring 644 abuts against the limiting platform 6423 inside the limiting sleeve 642. As the isolating knife 4 rotates in the first rotation direction, the cam 71 assembly 7 engages with the pull rod 64 via the limiting sleeve 642. Thus, when the isolating knife 4 is closed, the cam 71 assembly 7 presses against the limiting sleeve 642 on the pull rod 64, causing the moving conductive rod 53 inside the vacuum interrupter 5 to move towards the stationary conductive rod 51, thereby closing the vacuum interrupter 5. Simultaneously, the limiting sleeve 642, fitted onto the limiting guide hole 6421, guides the movement of the guide.

[0040] By moving the lower edge pull rod 64 towards the moving end cover 52 of the vacuum interrupter, the contact spring 644 is compressed. The reaction force of the contact spring 644 eliminates the electric repulsive force generated when the vacuum interrupter 5 is closed, preventing the moving conductive rod 53 from being bounced away by the electric repulsive force. When the isolating knife 4 is separated from the crank arm 62, the force on the cam 71 assembly 7 disappears, and the vacuum interrupter 5 remains in the closed state by its own self-closing force. This ensures that the vacuum interrupter 5 is in the closed state when the isolating knife 4 is opened, and thus the opening and arc extinguishing operation is performed by means of the vacuum interrupter 5, ensuring the effectiveness of the operation of the vacuum interrupter 5 when opening and closing.

[0041] like Figure 3 and combined Figure 4 As shown, in one embodiment of this utility model, the cam 71 assembly 7

[0042] The system includes a cam 71, a reversing block 72, and a reversing spring 73. The cam 71 has a first mounting hole 711 in its middle, through which it is rotatably mounted on a first support shaft 61. The cam 71 drives a limiting sleeve 642 to move linearly. The upper half of the cam 71 has a mounting groove 712, the opening of which communicates with the first mounting hole 711. The reversing block 72 is rotatably mounted within the mounting groove 712 of the cam 71. The lower end of the reversing block 72 is symmetrically provided with a first reversing arm 721 and a second reversing arm 722.

[0043] 10. A reversing arm 721, a second reversing arm 722, and a reversing block 72 form an inverted Y-shaped structure. A first wedge-shaped groove 611 and a second wedge-shaped groove 612, respectively, are provided on the first support shaft 61 to match the first reversing arm 721 and the second reversing arm 722. A lever 613 is provided on the outer peripheral wall of the first support shaft 61 between the first wedge-shaped groove 611 and the second wedge-shaped groove 612. A reversing spring 73 is installed between the bottom of the mounting groove 712 of the cam 71 and the reversing block 72. In this embodiment, the cam 71 is sleeved on the first support shaft 61, because...

[0044] The cam 71 cannot directly follow the rotation of the first support shaft 61. The function of the reversing block 72 is to reverse the rotation of the cam 71. When the isolating knife 4 is closed, the isolating knife 4 rotates counterclockwise, causing the crank arm 62 to rotate clockwise. At the same time, the first support shaft 61 also rotates clockwise. The paddle block 613 on the first support shaft 61 then actuates the second reversing arm 722, causing the first reversing arm 721 to abut against the first wedge groove 611 on the first support shaft 61. The reversing spring 73 keeps the first reversing arm 721 in contact with the first wedge groove 611 on the first support shaft 61.

[0045] When the isolating knife 4 continues to rotate, the cam 71 will start to rotate clockwise under the action of the reversing block 72, and the cam 71 will drive the vacuum interrupter 5 to close. When the isolating knife 4 is open, the isolating knife 4 rotates clockwise, and the crank arm 62 rotates counterclockwise. At the same time, the first support shaft 61 also rotates counterclockwise. The paddle block 613 set on the first support shaft 61 will paddle the first reversing arm 721 so that the second reversing arm 722 abuts against the second wedge groove 612 on the first support shaft 61. The reversing spring 73 keeps the second reversing arm 722 abutting against the second wedge groove 612. As the isolating knife 4 continues to rotate, the cam 71 will start to rotate counterclockwise under the action of the reversing block 72, and the cam 71 will drive the vacuum interrupter 5 to open. Therefore, the commutator 72 significantly improves the reliability and performance of the isolation knife 4 and the vacuum interrupter 5 working together through precise direction control, simplified transmission structure, stable operation guarantee and efficient force transmission.

[0046] like Figure 4As shown, the specific installation method of the reversing block 72 and the cam 71 is as follows: a mounting post 713 is provided in the middle of the groove wall of the mounting groove 712 of the cam 71, and a second mounting hole 723 is provided in the middle of the reversing block 72, so that the reversing block 72 is rotatably sleeved on the mounting post 713 through the second mounting hole 723.

[0047] like Figure 4 As shown, the specific installation method of the reversing spring 73 is as follows: a fixing post 724 is provided at the upper end of the reversing block 72, so that the lower end of the reversing spring 73 is fixedly sleeved on the fixing post 724, and the upper end of the reversing spring 73 abuts against the bottom of the mounting groove 712 of the cam 71.

[0048] like Figure 3 and combined Figure 4 As shown, in one embodiment of this utility model, the depth of the first wedge groove 611 is less than the depth of the second wedge groove 612, and the toggle block 613 is away from the opening of the first wedge groove 611 and close to the opening of the second wedge groove 612. This arrangement serves two purposes: First, when the isolating switch 4 is closed, the toggle block 613 can be used to actuate the second reversing arm 722 in advance, causing the first reversing arm 721 to quickly abut against the first wedge groove 611, ensuring that the vacuum interrupter 5 is in a closed state before the isolating switch 4 contacts the isolating stationary contact 23. Second, when the isolating switch 4 is opened, the toggle block 613 can be used to actuate the first reversing arm 721 with a delayed motion, and the first support shaft 61 can be rotated at a larger angle to allow the second reversing arm 722 to abut against the second wedge groove 612, preventing the vacuum interrupter 5 from prematurely opening before the isolating switch 4 separates from the isolating stationary contact 23. This achieves a forced timing control mechanism for the vacuum interrupter 5 to close first and then open, strictly matching the mechanical action of the isolating switch 4. When closing the circuit, the arc-extinguishing chamber closes in advance to prepare for circuit conduction; when opening the circuit, the arc-extinguishing chamber delays disconnection to ensure that the isolating switch 4 is completely separated before cutting off the current. This avoids damage to the load switch caused by disordered operation sequence, and improves the safety and reliability of operation.

[0049] like Figure 2 and combined Figure 3As shown, in one embodiment of this utility model, the support frame 6 includes a base plate 65, a first upright plate 66, and a second upright plate 67. The base plate 65 is fixedly connected to the movable cover plate of the vacuum interrupter 5. The first upright plate 66 is fixed to the left side of the base plate 65, and the second upright plate 67 is fixed to the right side of the base plate 65. A first support shaft 61 is rotatably disposed between the first upright plate 66 and the second upright plate 67. A limiting plate 624 is fixed on the first support shaft 61 between the first upright plate 66 and the cam 71. The front side of the limiting plate 624 is provided with a first bent plate 6241 that bends toward the first upright plate 66, and the front side of the support frame 6 is provided with a second bent plate 661 that bends toward the limiting plate 624. The first bent plate 6241 and the second bent plate 661 are stacked one behind the other. A torsion spring 625 is sleeved on the first support shaft 61 between the first upright plate 66 and the limiting shaft. The first bent plate 6241 and the second bent plate 661 are located between the two torsion feet 6251 of the torsion spring 625. In this way, when the isolating switch 4 is open, no matter how the first support shaft 61 rotates, the two torsion feet 6251 of the torsion spring 625 are always engaged, with one torsion foot 6251 cooperating with the stop of the first bending plate 6241 and the other torsion foot 6251 cooperating with the stop of the second bending plate 661. This ensures that the isolating switch 4 and the crank arm lever 62 are in close contact during the opening and closing process of the isolating switch 4, and also allows the components set on the first support shaft 61 to return to their initial positions after the opening and closing process of the isolating switch 4 is completed, waiting for the next operation.

[0050] like Figure 3 As shown, to prevent the kinetic energy of the crank arm lever 62 from being too great and impacting the vacuum interrupter 5,

[0051] A baffle 651 bent upwards at an angle is provided on the lower side of the base plate 65. The baffle 651 cooperates with the crank arm lever 62 for stopping. When the isolation knife 4 separates from the crank arm lever 62, the crank arm lever 62 cannot continue to rotate due to the blocking effect of the limiting plate 624. Therefore, the cam 71 will not excessively press against the limiting sleeve 642, ensuring that the vacuum interrupter 5 will not be impacted.

[0052] This utility model embodiment also provides two ways to connect the cam 71 and the limiting sleeve 642: the first type of crank arm cam 71 connection structure

[0053] like Figure 3As shown, a second support shaft 68 is fixed between the first vertical plate 66 and the second vertical plate 67. The second support shaft 68 is located behind the first support shaft 61. A transmission crank arm 681 is rotatably mounted on the second support shaft 68. The transmission crank arm 681 is provided with a lower crank arm 6811 extending downward and a front crank arm 6812 extending forward. The lower crank arm 6811 is hinged to the limiting sleeve 642. The cam 71 is provided with an upper protrusion 714 and a lower protrusion 715 from top to bottom on the side facing the crank arm. The upper protrusion 714 is press-fitted with the front crank arm 6812, and the lower protrusion 715 is press-fitted with the limiting sleeve 642. When the isolating switch 4 is closed, the upper protrusion 714 separates from the front crank arm 6812, and the lower protrusion 715 pushes the limiting sleeve 642 backward, thereby causing the moving conductive rod 53 to move toward the stationary conductive rod 51, and finally causing the vacuum interrupter 5 to close. When the isolating switch 4 is open, the lower protrusion 715 separates from the limiting sleeve 642, and the upper protrusion 714 pushes the front crank arm 6812 backward. Under the action of the second support shaft 68, the lower crank arm drives the limiting sleeve 642 to move forward, causing the moving conductive rod 53 and the stationary conductive rod 51 to separate, and the vacuum interrupter 5 to open.

[0054] The second type of track cam 71 connection structure

[0055] like Figure 13 and combined Figure 14-15 The limiting sleeve 642 is provided with a push rod 645, and the rear side of the cam 71 is provided with a cam 71 groove. The push rod 645 is disposed in the cam 71 groove and slides in cooperation with the cam 71. The cam 71 groove includes a first arc-shaped groove 717 and a second arc-shaped groove 718.

[0056] The 20-shaped slot 718 is connected, and the first arc-shaped slot 717 is located above the second arc-shaped slot 718. The first arc-shaped slot 717 is arranged forward, and the second arc-shaped slot 718 is arranged backward. When the isolating switch 4 is closed, the push rod 645 slides from the first arc-shaped slot 717 into the second arc-shaped slot 718. Because the second arc-shaped slot 718 is arranged backward, it will drive the limit sleeve 642 to move backward, thereby causing the moving conductive rod 53 to move towards the stationary conductive rod 51, and finally causing the vacuum interrupter 5 to close. When the isolating switch 4 is open, the push rod 645 slides from the second arc-shaped slot 718 into the first arc-shaped slot 717. Because the first arc-shaped slot 717 is arranged forward, it will drive the limit sleeve 642 to move forward, causing the moving conductive rod 53 and the stationary conductive rod 51 to separate, and the vacuum interrupter 5 to open.

[0057] In one embodiment of this utility model, a grounding support shaft 8 is installed on the switch frame 1 on the lower side of the isolation shaft 3, and a grounding contact 81 that cooperates with the isolation knife 4 is installed on the grounding support shaft 8, thereby facilitating reliable grounding of the isolation knife 4 after the switch is opened.

[0058] like Figure 5-12As shown, taking the load switch with the crank arm cam 71 connection structure as an example, the basic operating principle of this utility model is as follows:

[0059] Closing process:

[0060] By operating the isolation shaft 3, the isolation blade 4 is driven to rotate counterclockwise. The isolation blade 4 first contacts the crank arm lever 62. The crank arm lever 62 rotates together with the first support shaft 61 fixed to it. The first support shaft 61 rotates together with the cam 71 through its own first wedge groove 611, causing the reversing block 72 to drive the cam 71 to rotate together, so that the front crank arm 6812 slides off the upper protrusion 714 of the cam 71. The vacuum interrupter 5 closes due to the self-closing force and the force of the lower protrusion 715 at the other end of the cam 71 pressing against the limiting sleeve 642 (a bellows is sleeved on the moving conductive rod 53 of the vacuum interrupter 5, and the bellows has a telescopic function). Through the compression of the contact spring 644, the moving and stationary contacts of the vacuum interrupter 5 are tightly fitted together. At this time, the current will pass through the conductor 21, through the stationary conductor 51 and the moving conductor 53 of the vacuum interrupter 5, and then through the flexible connection 63 connecting the moving conductor 53 of the vacuum interrupter 5 and the crank arm lever 62, the current will be transmitted to the crank arm lever 62. At this time, the crank arm lever 62 and the isolating blade 4 are in close contact under the action of the torsion spring 625 (that is, the isolating blade 4 itself has a force to move the crank arm lever 62, and the torsion spring 625 generates a reaction force on the crank arm lever 62, thus ensuring that the isolating blade 4 and the crank arm lever 62 are in close contact), so that the current is transmitted to the isolating blade 4, thereby making the upper and lower ends of the isolating blade 4 conductive due to the closure of the vacuum interrupter 5. At this point, the isolating blade 4 continues to rotate counterclockwise until it contacts the isolating stationary contact 23. At this point, the isolating blade 4 and the vacuum interrupter 5 are connected in parallel. The isolating blade 4 continues to rotate counterclockwise to its final position. At this time, the crank arm lever 62 disengages from the isolating blade 4 and rotates counterclockwise under the action of the torsion spring 625. Meanwhile, the cam 71, under the reaction force of the contact spring 644, rotates along with the crank arm lever 62 until it disengages from the limit sleeve 642. The cam 71 then stops rotating. At this point, the crank arm lever 62 continues to rotate under the action of the torsion spring 625 and inertia, exceeding the initial rotation. The point causes the lever 613 on the first support shaft 61, which moves together with the crank arm lever 62, to move the first reversing arm 721, causing the reversing block 72 to rotate. When the reversing spring 73 passes the midpoint, the reversing spring 73 will push the reversing block 72 to rotate clockwise, causing the second reversing arm 722 to adhere to the surface of the first support shaft 61. When the torsion spring 625 resets the crank arm lever 62, the second reversing arm 722 is above the second wedge groove 612 of the first support shaft 61 (i.e., the second reversing arm 722 has not fallen into the second wedge groove 612), at which point the closing process ends.

[0061] Opening process:

[0062] When isolating blade 4 rotates clockwise, it first contacts the crank arm lever 62, at which point isolating blade 4 and vacuum interrupter 5 are connected in parallel. As isolating blade 4 and crank arm lever 62 continue to rotate, commutator block 72 enters the second wedge-shaped groove of the first support shaft 61, causing commutator block 72 to drive cam 71 to rotate together. At this point, isolating blade 4 has separated from isolating stationary contact 23, and current flows only from the high-voltage end through vacuum interrupter 5, flexible connection 63 (i.e., flexible wire), crank arm lever 62, and isolating blade 4. As isolating blade 4 continues to move, cam 71 presses against the front crank arm 6812, causing it to separate from vacuum interrupter 5. At this point, the current is disconnected, and isolating blade 4 continues to rotate. The lever 62 separates from the crank arm lever 62. Under the action of the torsion spring 625 and inertial force, the crank arm lever 62 rotates clockwise back and exceeds the starting point, returning to its initial position clockwise. At the same time, it actuates the reversing block 72, causing the lever 613 on the first support shaft 61, which moves together with the crank arm lever 62, to actuate the second reversing arm 722, causing the reversing block 72 to rotate. When the reversing spring 73 passes the midpoint, the reversing spring 73 pushes the reversing block 72 to rotate clockwise, causing the first reversing arm 721 to adhere to the surface of the rotating shaft. When the return spring resets the crank arm lever 62, the first reversing arm 721 will fall into the first wedge groove 611 of the first support shaft 61, at which point the tripping process ends.

[0063] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model.

[0064] The description is simplified and is not intended to indicate or imply 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 this utility model.

[0065] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection.

[0066] The connection can be either internal or indirect, via an intermediate medium, and can be either a connection within the two components or an interaction between the two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or...

[0068] This implies relative importance or implicitly specifies the number of technical features being indicated. Therefore, it defines "the first".

[0069] The features “a” and “b” may explicitly or implicitly include at least one of those features. In the description of this utility model, “multiple” means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0070] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and simple improvements made on the substantive content of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A split-connected load switch, characterized in that: The device includes a switch frame, on which a busbar mounting shaft and an isolation rotating shaft are sequentially mounted from top to bottom. An isolation blade is fixed on the isolation rotating shaft. A conductor is mounted on the busbar mounting shaft. The upper end of the conductor is connected to an incoming busbar, the upper half of which is bent forward. The lower end of the conductor is connected to an isolation stationary contact that cooperates with the isolation blade. A vacuum interrupter is mounted in the middle of the conductor. The stationary conductive rod of the vacuum interrupter is connected to the conductor. A support frame is fixed on the moving end cover of the vacuum interrupter. A first support shaft is rotatably mounted on the support frame. A crank arm lever that cooperates with the isolation blade is fixed on the first support shaft. The crank arm lever is connected to the moving conductive rod of the vacuum interrupter via a flexible connection. A pull rod is provided on the moving conductive rod. A cam assembly is also mounted on the first support shaft. The cam assembly and the pull rod cooperate to control the opening and closing of the vacuum interrupter.

2. A split-connection load switch according to claim 1, characterized in that: The pull rod is equipped with an end cap and a limiting sleeve. A limiting ring platform is provided in the middle of the pull rod. The end cap is fitted onto the pull rod behind the limiting ring platform. The limiting sleeve is fitted onto the pull rod in front of the limiting ring platform and is connected to the end cap. The interior of the limiting sleeve has an assembly hole and a limiting guide hole arranged sequentially from back to front. The assembly hole and the limiting guide hole are connected. The diameter of the assembly hole is larger than the diameter of the limiting guide hole, so that a limiting platform is formed inside the limiting sleeve. The free end of the pull rod is inserted into the limiting guide hole of the limiting sleeve. A contact spring is also fitted on the pull rod. One end of the contact spring abuts against the limiting ring platform, and the other end of the contact spring abuts against the limiting platform inside the limiting sleeve. The cam assembly is driven by the pull rod through the limiting sleeve.

3. A split-connection load switch according to claim 2, characterized in that: The cam assembly includes a cam, a reversing block, and a reversing spring. The cam has a first mounting hole in its middle. The cam is rotatably mounted on a first support shaft through the first mounting hole. The cam drives a limiting sleeve to move linearly. The upper half of the cam has a mounting groove. The opening of the mounting groove of the cam communicates with the first mounting hole. The reversing block is rotatably mounted in the mounting groove of the cam. The lower end of the reversing block is symmetrically provided with a first reversing arm and a second reversing arm. The first reversing arm, the second reversing arm, and the reversing block form an inverted Y-shaped structure. The first support shaft is provided with a first wedge groove and a second wedge groove that match the first reversing arm and the second reversing arm, respectively. A lever is provided on the outer peripheral wall of the first support shaft between the first wedge groove and the second wedge groove. The reversing spring is installed between the bottom of the mounting groove of the cam and the reversing block.

4. A split-connected load switch according to claim 3, characterized in that: The depth of the first wedge groove is less than the depth of the second wedge groove, and the pusher block is away from the opening of the first wedge groove and close to the opening of the second wedge groove.

5. A split-connection load switch according to claim 4, characterized in that: The mounting groove has a mounting post in the middle of its wall and a second mounting hole in the middle of its center. The reversing block is rotatably mounted on the mounting post through the second mounting hole. The upper end of the reversing block has a fixing post, and the lower end of the reversing spring is fixedly mounted on the fixing post. The upper end of the reversing spring abuts against the bottom of the mounting groove of the cam.

6. A split-connection load switch according to claim 5, characterized in that: The support frame includes a base plate, a first upright plate, and a second upright plate. The base plate is fixedly connected to the movable cover plate of the vacuum interrupter. The first upright plate is fixed to the left side of the base plate, and the second upright plate is fixed to the right side of the base plate. The first support shaft is rotatably disposed between the first upright plate and the second upright plate. A limit plate is fixed on the first support shaft between the first upright plate and the cam. The front side of the limit plate is provided with a first bent plate that bends toward the first upright plate, and the front side of the support frame is provided with a second bent plate that bends toward the limit plate. The first bent plate and the second bent plate are stacked one after the other. A torsion spring is sleeved on the first support shaft between the first upright plate and the limit shaft, and the first bent plate and the second bent plate are located between the two torsion feet of the torsion spring.

7. A split-connected load switch according to claim 6, characterized in that: The bottom plate is provided with an upwardly bent baffle, which cooperates with the crank arm paddle stop.

8. A split-connected load switch according to claim 7, characterized in that: A second support shaft is fixed between the first and second upright plates. The second support shaft is located behind the first support shaft. A transmission crank arm is rotatably mounted on the second support shaft. The transmission crank arm has a lower crank arm extending downward and a front crank arm extending forward. The lower crank arm is hinged to the limiting sleeve. The cam has an upper protrusion and a lower protrusion arranged sequentially from top to bottom on the side facing the crank arm. The upper protrusion is press-fitted with the front crank arm, and the lower protrusion is press-fitted with the limiting sleeve.

9. A split-connection load switch according to claim 7, characterized in that: The limiting sleeve is provided with a push rod, and the rear side of the cam is provided with a cam groove. The push rod is disposed in the cam groove and slides in cooperation with the cam. The cam groove includes a first arc groove and a second arc groove. The first arc groove and the second arc groove are connected. The first arc groove is located on the upper side of the second arc groove. The first arc groove is arranged in front and the second arc groove is arranged in the rear.

10. A split-connection load switch according to any one of claims 8-9, characterized in that: A grounding support shaft is installed on the switch frame on the lower side of the isolation shaft, and a grounding contact that cooperates with the isolation blade is installed on the grounding support shaft.

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