Straight pole high voltage grounding switch

Abstract

The application provides a straight-rod high-voltage grounding switch, which comprises a mounting base, a support insulator, a grounding static contact, a ground knife assembly, a driving mechanism, a limiting mechanism and a ground knife moving contact. The support insulator is arranged on the mounting base. The grounding static contact is arranged at the end of the support insulator away from the mounting base and comprises a guide channel and an insertion part. The ground knife assembly comprises a knife arm fixed guide rod and a ground knife arm sleeved outside the knife arm fixed guide rod. The driving mechanism is connected with the ground knife arm. The limiting mechanism is arranged between the mounting base and the ground knife arm. The ground knife moving contact is located at the end of the ground knife arm away from the knife arm fixed guide rod. The straight-rod high-voltage grounding switch changes one-step single action closing into two-step closing, avoids the problem of too large resistance torque caused by one-step action contact closing, and can realize stable closing of the ground knife moving contact. In extreme cases, the contact is difficult to be repelled by external force to cause contact disengagement, and the reliability is very high.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch technology, and in particular to a straight rod high-voltage grounding switch. Background Technology

[0002] For 220kV and above open-type high-voltage grounding switches, due to the increased distance to ground, when using a straight-arm switch, the long arm necessitates either a rapid closing speed or a large operating torque to overcome the contact's closing resistance if the grounding contact is closed using a direct-action method. Similarly, the opening process presents challenges, requiring a large operating torque to separate the grounding contact, inevitably causing the grounding arm to suddenly pop out. To avoid these issues, the contact pressure must be significantly reduced, thus decreasing contact resistance. However, this drastically reduces the contact's ability to withstand short-term current, leading to contact burnout.

[0003] Although the above problems can be avoided by adopting a vertical telescopic folding cutter arm structure, the folding cutter arm structure is complex and the debugging is complicated. Summary of the Invention

[0004] The main objective of this invention is to provide a straight-rod high-voltage grounding switch to solve the technical problems of complex structure and complicated debugging of vertical telescopic folding knife arm structure.

[0005] To achieve the above objectives, the present invention provides a straight rod high-voltage grounding switch, including a mounting base, a post insulator, a grounding stationary contact, a grounding switch assembly, a drive mechanism, a limit mechanism, and a grounding switch moving contact.

[0006] The post insulator is mounted on the mounting base.

[0007] The grounding stationary contact is located at the end of the post insulator furthest from the mounting base, and includes a guide channel and an insertion part arranged sequentially from near to far from the mounting base.

[0008] The grounding knife assembly includes a knife arm fixing guide rod and a grounding knife arm sleeved outside the knife arm fixing guide rod. The knife arm fixing guide rod is rotatably connected to the first connection point of the mounting base.

[0009] The drive mechanism is connected to the ground cutter arm and has a first force to drive the ground cutter arm to rotate around the first connection point and a second force to drive the ground cutter arm to move axially along the fixed guide rod of the cutter arm.

[0010] The limiting mechanism is located between the mounting base and the grounding arm to limit the second force acting on the grounding arm before the grounding arm rotates to a preset angle.

[0011] The moving contact of the ground knife is located at the end of the ground knife arm away from the fixed guide rod of the knife arm, and when the ground knife arm reaches the preset angle, the moving contact of the ground knife reaches the guide channel and then contacts the insertion part.

[0012] According to an embodiment of this application, the straight rod high-voltage grounding switch also includes a knife arm base that is fixedly connected to the mounting base.

[0013] The drive mechanism includes a transmission assembly and a drive assembly. The transmission assembly includes a first connecting arm, a second connecting arm, and a first rotating shaft. The first rotating shaft is connected to the drive assembly and rotates about its own axis.

[0014] The tool arm fixing guide rod is hinged to the tool arm base, and the first connecting arm is hinged to the tool arm base through the first rotating shaft.

[0015] The second connecting arm is connected between the first connecting arm and the ground knife arm. The knife arm fixed guide rod, the first connecting arm, the second connecting arm and the ground knife arm constitute a slider four-bar linkage mechanism, wherein the knife arm base is the frame of the slider four-bar linkage mechanism.

[0016] According to an embodiment of this application, the drive assembly further includes a first crank arm, a transmission tie rod, a second crank arm, a drive spindle, and a transmission flange.

[0017] The first pivot extends into the mounting base, and the first crank arm is fixed to the first pivot.

[0018] The drive spindle is rotatably connected to the mounting base, and the second crank arm is fixed to the drive spindle.

[0019] The transmission rod includes a first end and a second end arranged opposite to each other. The first end of the transmission rod is connected to a first crank arm, forming a first crank mechanism. The second end of the transmission rod is connected to a second crank arm, forming a second crank mechanism. The rotation planes of the first crank mechanism and the second crank mechanism are perpendicular.

[0020] According to an embodiment of this application, the transmission rod includes a rod body, a first universal joint, and a second universal joint. The rod body is connected to a first crank arm via the first universal joint. The rod body is connected to a second crank arm via the second universal joint.

[0021] According to an embodiment of this application, the transmission assembly further includes a first sleeve and a balance torsion spring, wherein the first sleeve is fixedly connected to the cutter arm base.

[0022] One end of the balance torsion spring is fitted and fixed on the first sleeve, and the other end is connected to the tool arm fixing guide rod.

[0023] According to an embodiment of this application, the limiting mechanism includes a limiting pin and a limiting hook, with the limiting hook fixed to one of the cutter arm base and the ground cutter arm, and the limiting pin fixed to the other.

[0024] The limiting hook includes an arc-shaped groove, and the limiting pin has a limiting state in which it abuts against the edge of the arc-shaped groove when the ground cutter arm has not reached the preset angle, and a free state in which it disengages from the edge of the arc-shaped groove when the ground cutter arm reaches the preset angle.

[0025] According to an embodiment of this application, the guide channel includes a first segment and a second segment, wherein the opening width of the second segment is smaller than the opening width of the first segment.

[0026] The insertion part is located above the second segment and communicates with the space surrounded by the second segment, while the opening of the first segment faces the ground knife arm.

[0027] According to the embodiments of this application, the diameter of the insertion part gradually decreases in the direction from near to far relative to the mounting base, and the shape of the grounding contact corresponds to the shape of the insertion part.

[0028] According to an embodiment of this application, the first segment has a conductive contact in the circumferential direction.

[0029] According to an embodiment of this application, it also includes an equalizing ring, which is disposed at the end of the post insulator away from the mounting base, and a grounding stationary contact is disposed on the equalizing ring. The equalizing ring includes a passage notch facing the guide channel.

[0030] In the aforementioned straight-rod high-voltage grounding switch, under the action of the first force of the drive mechanism, the grounding arm rotates relative to the mounting base, and the moving contact of the grounding arm rotates with the grounding arm. Since the rotation angle of the grounding arm has not reached the preset angle, the limiting mechanism can keep the grounding arm and the fixed guide rod of the grounding arm relatively stationary. When the rotation angle of the grounding arm has not reached the preset angle, the moving contact of the grounding arm reaches the guide channel, and the limiting effect of the limiting mechanism disappears. Under the action of the second force, the grounding arm slides away from the first connection point relative to the fixed guide rod of the grounding arm. The moving contact of the grounding arm continues to move and contacts the insertion part, thereby realizing the closing. The aforementioned straight-rod high-voltage grounding switch transforms the one-step single-action closing of the grounding arm into a two-step closing, avoiding the problem of excessive resistance torque caused by the one-step contact closing. At the same time, it can achieve stable closing of the moving contact of the grounding arm, and it is difficult for the contact to be dislodged by external force even in extreme cases, resulting in extremely high reliability. Moreover, compared to the folding telescopic insertion ground knife solution, the product structure is simpler, and the overall cost in terms of materials, production, installation, commissioning, operation and maintenance is lower, resulting in better technical and economic benefits. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a straight rod high-voltage grounding switch in the open state according to an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of the grounding arm of the straight rod high voltage grounding switch of one embodiment of this application rotating before reaching the preset angle;

[0034] Figure 3 yes Figure 2 A partially enlarged structural schematic diagram;

[0035] Figure 4 This is a schematic diagram of the structure of a straight-rod high-voltage grounding switch in the raised arm state according to an embodiment of this application;

[0036] Figure 5 yes Figure 4 A schematic diagram of a straight-rod high-voltage grounding switch in the inserted state;

[0037] Figure 6 yes Figure 4 A partially enlarged schematic diagram of the straight rod high-voltage grounding switch in the inserted state;

[0038] Figure 7 yes Figure 4 A schematic diagram showing the cooperation between the straight rod high-voltage grounding switch, the grounding arm, the fixed guide rod of the grounding arm, and the drive mechanism when the switch is in the inserted state.

[0039] Figure 8 This is a schematic diagram of the limiting mechanism of the grounding arm of the straight rod high voltage grounding switch according to an embodiment of this application when it has not reached the preset angle;

[0040] Figure 9 This is a schematic diagram of the limiting mechanism of the grounding arm of the straight rod high-voltage grounding switch according to an embodiment of this application when it reaches a preset angle.

[0041] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0045] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0046] This invention provides a straight-pole high-voltage grounding switch, see [link / reference] Figure 1 It includes a mounting base 1, a post insulator 12, a grounding stationary contact 13, a grounding switch assembly, a drive mechanism, a limit mechanism, and a grounding switch moving contact 17.

[0047] Mounting base 1 is the mounting base for the straight-pole high-voltage grounding switch, installed on a steel column at the substation site. Post insulator 12 is mounted on mounting base 1. Post insulator 12 includes a near-ground end close to mounting base 1 and a far-ground end away from mounting base 1. Grounding stationary contact 13 is located at the far-ground end of post insulator 12. Grounding stationary contact 13 includes a guide channel 131 and an insertion portion 132 arranged sequentially from near to far from mounting base 1. Guide channel 131 is located on the rotation trajectory of the grounding switch assembly and has an opening facing the grounding switch assembly. Insertion portion 132 is located on the side of guide channel 131 away from mounting base 1; for ease of description, it is referred to as being located above mounting base 1.

[0048] See Figure 6The grounding switch assembly includes a grounding arm fixing guide rod 10 and a grounding arm 9 sleeved on the grounding arm fixing guide rod 10. The grounding arm 9 is the grounding arm 9 of the straight rod high-voltage grounding switch, and has a straight rod structure. The grounding arm fixing guide rod 10 is rotatably connected to the first connection point of the mounting base 1. Under the action of external force, the grounding arm 9 can slide relative to the grounding arm fixing guide rod 10. The grounding arm fixing guide rod 10 is a support rod for the rotation of the grounding arm 9, and also an axial guide for the grounding arm 9 to finally insert upwards for closing.

[0049] See Figure 2 The drive mechanism is connected to the ground cutter arm 9 and has a first force to drive the ground cutter arm 9 to rotate around the first connection point and a second force to drive the ground cutter arm 9 to move axially along the fixed guide rod 10 of the cutter arm. Since the drive mechanism has these two components (the first and second forces), it can drive the ground cutter arm 9 to rotate around the first connection point or move axially along the fixed guide rod 10 of the cutter arm without external force restriction. The drive mechanism can be a single drive component that provides both the first and second forces. Alternatively, multiple drive mechanisms can work together, with one drive component providing the first force (e.g., a drive motor) and another drive component providing the second force (e.g., a linear motor).

[0050] A limiting mechanism is positioned between the mounting base 1 and the grounding arm 9 to limit the second force acting on the grounding arm 9 before it rotates to a preset angle. (See also...) Figure 3 The preset angle is the angle required for the grounding arm 9 to close, such as 90°. Before the grounding arm 9 rotates to the preset angle, the limiting mechanism can provide a reaction force that is opposite to and greater than or equal to the second force, thereby keeping the arm fixing guide rod 10 and the grounding arm 9 relatively stationary. When the grounding arm 9 rotates to the preset angle, the straight rod high-voltage grounding switch completes the arm-raising action. Furthermore, the grounding arm 9 is released from the limitation of the limiting mechanism, and the drive mechanism continues to move, moving upwards relative to the arm fixing guide rod 10 away from the mounting base 1 under the action of the second force.

[0051] See Figure 4 , Figure 5 and Figure 6 The moving contact 17 of the grounding switch is located at the end of the grounding arm 9 away from the fixed guide rod 10. If fixedly connected to the top of the grounding arm 9, it can move with the grounding arm 9. When the grounding arm 9 reaches a preset angle, the moving contact 17 reaches the guide channel 131. As the grounding arm 9 continues to move upward relative to the fixed guide rod 10, the moving contact 17 contacts the insertion part 132. The straight-rod high-voltage grounding switch has completed its insertion action.

[0052] The closing of this straight-rod high-voltage grounding switch consists of two parts: arm raising and insertion. A limiting mechanism ensures that the order of these two actions remains constant; otherwise, the moving contact 17 of the grounding switch would not be able to enter the stationary contact, leading to closing failure. Closing the grounding arm 9 involves rotating it from its initial position by a preset angle (arm raising), causing the moving contact 17 to contact the insertion part 132 (insertion). Opening the grounding arm 9 involves separating the moving contact 17 from the insertion part 132 and rotating it in the opposite direction by a preset angle to return to its initial position.

[0053] During the opening process of the grounding switch arm 9, the movement of the grounding switch assembly, drive mechanism, limit mechanism and grounding switch moving contact 17 is exactly the opposite of the movement of the corresponding components during the closing process of the grounding switch arm 9, which will not be described in detail here.

[0054] In the aforementioned straight-rod high-voltage grounding switch, under the action of the first force of the drive mechanism, the grounding arm 9 rotates relative to the mounting base 1, and the grounding movable contact 17 rotates with the grounding arm 9. Since the rotation angle of the grounding arm 9 has not reached the preset angle, the limiting mechanism can keep the grounding arm 9 and the fixed guide rod 10 of the grounding arm relatively stationary. When the rotation angle of the grounding arm 9 has not reached the preset angle, the grounding movable contact 17 reaches the guide channel 131, and the limiting effect of the limiting mechanism disappears. Under the action of the second force, the grounding arm 9 slides away from the first connection point relative to the fixed guide rod 10. The grounding movable contact 17 continues to move and contacts the insertion part 132, thereby achieving closing. The aforementioned straight-rod high-voltage grounding switch transforms the one-step single-action closing of the grounding arm 9 into a two-step closing, avoiding the problem of excessive resistance torque caused by one-step contact closing. At the same time, it can achieve stable closing of the grounding movable contact 17, making it difficult for the contact to be dislodged by external forces even in extreme cases, resulting in extremely high reliability. Moreover, compared to the folding telescopic insertion ground knife solution, the product structure is simpler, and the overall cost in terms of materials, production, installation, commissioning, operation and maintenance is lower, resulting in better technical and economic benefits.

[0055] In some embodiments, see Figure 3 The straight-rod high-voltage grounding switch also includes a knife arm base 5 fixedly connected to the mounting base 1. The knife arm base 5 can be installed on the side of the mounting base 1 and serves as the mounting base for the knife arm fixing guide rod 10.

[0056] The drive mechanism includes a transmission assembly and a drive assembly. The transmission assembly includes a first connecting arm 6, a second connecting arm 7, and a first rotating shaft 4. The first rotating shaft 4 is connected to the drive assembly and rotates around its own axis. The tool arm fixing guide rod 10 is hinged to the tool arm base 5, and the first connecting arm 6 is hinged to the tool arm base 5 via the first rotating shaft 4. The second connecting arm 7 is connected between the first connecting arm 6 and the ground tool arm 9. One end of the second connecting arm 7 is rotatably connected to the first connecting arm 6, and the other end is rotatably connected to the ground tool arm 9. For example, a tool arm drive clamp 8 that latches the ground tool arm 9 is fixed on the ground tool arm 9, and the tool arm drive clamp 8 is rotatably connected to the end of the second connecting arm 7.

[0057] The cutter arm fixed guide rod 10, the first connecting arm 6, the second connecting arm 7, and the ground cutter arm 9 constitute a slider four-bar linkage mechanism, wherein the cutter arm base 5 serves as the frame of the slider four-bar linkage mechanism. The first connecting arm 6 and the cutter arm fixed guide rod 10 are respectively two rockers of the slider four-bar linkage mechanism. The cutter arm fixed guide rod 10 and the ground cutter arm 9 are slidably connected to form the slider in the slider four-bar linkage mechanism.

[0058] For example, taking a preset angle of 90° as an example, in the initial position, the cutter arm fixing guide rod 10 is parallel to the cutter arm base 5, and the rotation angle is 0°. The drive assembly drives the first rotating shaft 4 to rotate, which in turn drives the cutter arm fixing guide rod 10 to rotate. When the cutter arm fixing guide rod 10 has not rotated to 90°, the limiting mechanism restricts the sliding of the ground cutter arm 9 relative to the cutter arm fixing guide rod 10. The slider four-bar linkage is actually a four-bar linkage mechanism.

[0059] When the fixed guide rod 10 of the cutter arm is perpendicular to the cutter arm base 5, the rotation angle is 90°. The ground cutter arm 9 is removed from the limiting range of the limiting mechanism, and the four-bar linkage reverts to a slider four-bar linkage. Under the action of the second force of the slider four-bar linkage, the ground cutter arm 9 moves upward. However, due to the restriction of the cutter arm base 5, the fixed guide rod 10 of the cutter arm cannot continue to rotate. That is, the continued rotation of the first rotating shaft 4 is converted into the closing insertion action of the ground cutter arm 9 through the slider four-bar linkage, so that the moving contact is inserted into the stationary contact, achieving reliable closing. Moreover, the insertion contact has a large contact force and strong current withstand capability, making it particularly suitable for extreme working conditions where the grounding switch withstands short-term withstand current.

[0060] The drive mechanism of this straight rod high-voltage grounding switch has a simple structure and good reliability. It provides the first and second forces through a drive component, which completes the two actions of rotating the knife arm fixed guide rod 10 and moving the ground knife arm 9 upward, thus reducing the cost of the equipment.

[0061] In some embodiments, see Figure 1 and Figure 3The drive assembly also includes a first crank arm 41, a transmission rod 3, a second crank arm 42, a drive spindle 243, and a transmission flange 44. The first rotating shaft 4 extends into the mounting base 1, and the first crank arm 41 is fixed to the first rotating shaft 4. The drive spindle 243 is rotatably connected to the mounting base 1, and the second crank arm 42 is fixed to the drive spindle 243. The transmission rod 3 includes a first end and a second end arranged opposite to each other. The first end of the transmission rod 3 is connected to the first crank arm 41, forming a first crank mechanism. The second end of the transmission rod 3 is connected to the second crank arm 42, forming a second crank mechanism. The rotation planes of the first crank mechanism and the second crank mechanism are perpendicular.

[0062] For example, the first crank is driven to rotate by the transmission rod 3. The rotation direction of the first crank is around the axis of the first rotating shaft 4, so as to drive the tool arm fixing guide rod 10 to rotate. Its rotation plane is parallel to the rotation plane of the tool arm fixing guide rod 10.

[0063] The second crank mechanism is driven to rotate by the drive spindle 243. The rotation direction of the second crank is around the axis of the drive spindle 243, and its rotation plane can be parallel to the bottom surface of the mounting base 1.

[0064] Specifically, the transmission rod 3 is driven by the drive spindle 243 to rotate the second crank arm 42, thereby driving the transmission rod 3 to move. The transmission rod 3 transmits power to the first crank mechanism, which in turn drives the first rotating shaft 4 to rotate. A transmission flange 44 can be installed at the end of the drive spindle 243 away from the second crank arm 42, and the transmission flange 44 is connected to an external drive component, such as a motor drive.

[0065] In some embodiments, see Figure 3 The transmission rod 3 includes a rod body, a first universal joint, and a second universal joint. The rod body is connected to the first crank arm 41 via the first universal joint. The rod body is connected to the second crank arm 42 via the second universal joint.

[0066] The first universal joint allows the tie rod body to primarily drive the first crank arm 41 to rotate, while offsetting or weakening the forces transmitted from the tie rod body to the first crank arm 41 in other directions, resulting in smoother and more regular movement of the first crank. The first and second universal joints can be universal bearings. Similarly, the function of the second universal joint is similar to that of the first universal joint, and will not be elaborated further.

[0067] In some embodiments, see Figure 3The transmission assembly also includes a first sleeve and a balance torsion spring 11. The first sleeve is fixedly connected to the cutter arm base 5. One end of the balance torsion spring 11 is sleeved and fixed on the first sleeve, and the other end is connected to the cutter arm fixing guide rod 10. For example, the end of the cutter arm fixing guide rod 10 connected to the cutter arm base 5 has a coaxial protrusion, and the end of the balance torsion spring 11 extends into a fixing hole in the protrusion. In this way, the rotation of the cutter arm fixing guide rod 10 can drive the balance torsion spring 11 to move, so that the balance torsion spring 11 stores energy.

[0068] The balancing torsion spring 11 can be used as an energy storage element to balance the gravitational torque of the grounding arm 9. For example, when the grounding arm 9 is tripped and falls down, the balancing torsion spring 11 provides it with balancing torque, and during the closing process of the grounding arm 9, the balancing torsion spring 11 releases the spring force.

[0069] In some embodiments, see Figure 7 and Figure 8 The limiting mechanism includes a limiting pin 16 and a limiting hook 15. The limiting hook 15 is fixed to one of the cutter arm base 5 and the ground cutter arm 9, and the limiting pin 16 is fixed to the other. For example, the limiting hook 15 is fixed to the cutter arm base 5, and the limiting pin 16 is fixed to the ground cutter arm 9.

[0070] The limiting hook 15 includes an arc-shaped groove, and the limiting pin 16 has a limiting state in which it abuts against the edge of the arc-shaped groove when the ground cutter arm 9 has not reached the preset angle, and a free state in which it disengages from the edge of the arc-shaped groove when the ground cutter arm 9 reaches the preset angle.

[0071] For example, the design of the position of the limiting hook 15 and the shape of the arc-shaped groove satisfies the following condition: when the ground tool arm 9 and the tool arm fixing guide rod 10 remain relatively stationary, the trajectory of the limiting pin 16 following the rotation of the ground tool arm 9 coincides with the edge of the arc-shaped groove. Due to the limiting effect of the arc-shaped groove, the limiting pin 16 can only move along the arc-shaped groove. In this way, the limiting mechanism provides a reaction force that limits the second action force, and the ground tool arm 9 cannot separate from the tool arm fixing guide rod 10, thus maintaining a stationary state. When the ground tool arm 9 reaches a preset angle, the limiting pin 16 disengages from the edge of the arc-shaped groove and becomes free. In this way, the limiting effect of the limiting mechanism disappears, and the ground tool arm 9 can move relative to the tool arm fixing guide rod 10. This type of limiting mechanism has a simple structure and high reliability.

[0072] In some embodiments, see Figure 7 and Figure 8The end of the limiting hook 15 furthest from the base 5 of the blade arm is a straight section. The plane of the straight section is perpendicular to the mounting base. After the limiting pin 16 disengages from the arc-shaped groove, it rises with the blade arm 9 and abuts against the plane of the straight section. The straight section provides lateral support for the limiting pin 16. In this way, the blade arm 9 is less likely to tip over. The straight rod high-voltage grounding switch has better stability, and the closing of the straight rod high-voltage grounding switch is more stable. Even in extreme cases, it is difficult for external forces to cause the contacts to detach, resulting in extremely high reliability.

[0073] In some embodiments, see Figure 5 The guide channel 131 includes a first segment 1311 and a second segment 1312, the opening width of the second segment 1312 being smaller than the opening width of the first segment 1311. The opening of the first segment 1311 faces the grounding arm 9. The first segment 1311 is closer to the grounding arm 9 than the second segment 1312, and its larger opening facilitates the entry of the grounding arm 9, thus serving a guiding function.

[0074] The insertion part 132 is located above the second segment 1312 and communicates with the space surrounding the second segment 1312. The insertion part 132 can be cylindrical, so that after the grounding switch moving contact 17 enters the insertion part 132, it is not easy to fall out, thus making the grounding switch contact close securely.

[0075] In some embodiments, see Figure 5 The diameter of the insertion portion 132 gradually decreases in the direction relative to the mounting base 1 from near to far, and the shape of the grounding contact 17 corresponds to the shape of the insertion portion 132. This design makes it easier for the grounding contact 17 to enter the insertion portion 132.

[0076] In some embodiments, the first segment 1311 has a conductive contact in the circumferential direction.

[0077] In some embodiments, see Figure 3 It also includes an equalizing ring 14, which is located at the end of the post insulator 12 away from the mounting base 1. A grounding stationary contact 13 is disposed on the equalizing ring 14, which includes a passage notch 141 facing the guide channel 131. This allows the grounding arm 9 to continue rotating through the passage notch 141 to reach a preset angle.

[0078] The equalizing ring 14 is installed on the top of the post insulator 12, which can play a uniform role in the electric field of the grounding stationary contact 13, improve the insulation withstand capability and reduce corona noise.

[0079] The above technical solutions of the present invention are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A straight-rod high-voltage grounding switch, characterized in that, include: Mounting base; The post insulator is mounted on the mounting base; A grounding stationary contact is disposed at the end of the post insulator away from the mounting base, and includes a guide channel and an insertion part arranged sequentially from near to far from the mounting base; a grounding switch assembly includes a blade arm fixing guide rod and a grounding switch arm sleeved outside the blade arm fixing guide rod, the blade arm fixing guide rod being rotatably connected to a first connection point of the mounting base; a drive mechanism is connected to the grounding switch arm and has a first force to drive the grounding switch arm to rotate around the first connection point and a second force to drive the grounding switch arm to move axially along the blade arm fixing guide rod; A limiting mechanism is provided between the mounting base and the grounding arm to limit the second force acting on the grounding arm before the grounding arm rotates to a preset angle; The grounding knife moving contact is located at the end of the grounding knife arm away from the knife arm fixed guide rod, and when the grounding knife arm reaches a preset angle, the grounding knife moving contact reaches the guide channel and then contacts the insertion part; The straight rod high-voltage grounding switch also includes a knife arm base fixedly connected to the mounting base; the driving mechanism includes a transmission component and a driving component, the transmission component includes a first connecting arm, a second connecting arm and a first rotating shaft; the first rotating shaft is connected to the driving component and rotates around its own axis; the knife arm fixed guide rod is hinged to the knife arm base, the first connecting arm is hinged to the knife arm base through the first rotating shaft; the second connecting arm is connected between the first connecting arm and the grounding knife arm, the knife arm fixed guide rod, the first connecting arm, the second connecting arm and the grounding knife arm constitute a slider four-bar linkage mechanism, wherein the knife arm base is the frame of the slider four-bar linkage mechanism; The limiting mechanism includes a limiting pin and a limiting hook. The limiting hook is fixed to one of the cutter arm base and the ground cutter arm, and the limiting pin is fixed to the other. The limiting hook includes an arc-shaped groove. The limiting pin has a limiting state in which it abuts against the edge of the arc-shaped groove when the ground cutter arm has not reached a preset angle, and a free state in which it disengages from the edge of the arc-shaped groove when the ground cutter arm reaches the preset angle.

2. The straight-rod high-voltage grounding switch according to claim 1, characterized in that, The drive assembly further includes a first crank arm, a transmission rod, a second crank arm, a drive spindle, and a transmission flange; the first rotating shaft extends into the mounting base, and the first crank arm is fixed to the first rotating shaft; the drive spindle is rotatably connected to the mounting base, and the second crank arm is fixed to the drive spindle; the transmission rod includes a first end and a second end disposed opposite to each other, the first end of the transmission rod is connected to the first crank arm to form a first crank mechanism; the second end of the transmission rod is connected to the second crank arm to form a second crank mechanism; the rotation planes of the first crank mechanism and the second crank mechanism are perpendicular.

3. The straight-rod high-voltage grounding switch according to claim 2, characterized in that, The transmission rod includes a rod body, a first universal joint, and a second universal joint. The rod body is connected to the first crank arm via the first universal joint; the rod body is connected to the second crank arm via the second universal joint.

4. The straight-rod high-voltage grounding switch according to claim 1, characterized in that, The transmission assembly also includes a first sleeve and a balance torsion spring. The first sleeve is fixedly connected to the cutter arm base. One end of the balance torsion spring is sleeved and fixed on the first sleeve, and the other end is connected to the cutter arm fixed guide rod.

5. The straight-rod high-voltage grounding switch according to claim 1, characterized in that, The guide channel includes a first segment and a second segment, wherein the opening width of the second segment is smaller than the opening width of the first segment; The insertion part is located above the second segment and communicates with the space surrounded by the second segment, and the opening of the first segment faces the ground knife arm.

6. The straight-pole high-voltage grounding switch according to claim 5, characterized in that, The diameter of the insertion part gradually decreases in the direction from near to far relative to the mounting base, and the shape of the grounding contact corresponds to the shape of the insertion part.

7. The straight-rod high-voltage grounding switch according to claim 5, characterized in that, The first segment has conductive contacts in its circumferential direction.

8. The straight-rod high-voltage grounding switch according to any one of claims 1 to 7, characterized in that, It also includes an equalizing ring, which is disposed at the end of the post insulator away from the mounting base, and the grounding stationary contact is disposed on the equalizing ring. The equalizing ring includes a passage notch facing the guide channel.

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