Moving contact structure

Abstract

The utility model discloses a moving contact structure which comprises a moving contact rod, and a knife tail of the moving contact rod is rotatably connected to a static contact seat. The tool bit of the moving feeler lever is wrapped by a first voltage-sharing cover, the first voltage-sharing cover is provided with a covered edge, and the covered edge wraps the outer side of the tool bit. The first voltage-sharing cover is attached to the side face of the tool bit and wraps the side edge and the top edge of the tool bit through the wrapping edge, the optimization effect of electric field distribution is better, and the voltage withstanding level is higher; the wrapping edge of the first voltage-sharing cover plays a role in wrapping and also has the functions of rotation prevention and positioning, during installation, the wrapping edge of the first voltage-sharing cover is buckled to the outer side edge and the top edge of the tool bit to achieve positioning, and then the tool bit is locked through the first pair of locking screws to complete assembly, so that not only is the arrangement of an anti-rotation structure saved, but also the assembly efficiency is improved. The design and machining difficulty of the tool bit and the first voltage equalizing cover is lowered, the requirement for assembly precision is lowered, and the assembly procedure is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical equipment, in particular to a moving contact structure. Background Art

[0002] Three-station assemblies used in power / electrical systems usually include a body frame, an isolation spindle, a support assembly, an isolation knife, contacts, etc.

[0003] Chinese utility model patent CN201820688U discloses a high-voltage load switch moving knife assembly, in which each moving knife rod of the moving knife assembly is equipped with a pressure-equalizing member on the outer side of one end of the contact, and the pressure-equalizing member is a thin-walled member die-cast from an aluminum alloy material. The pressure-equalizing member is only on the outer side of the moving knife rod away from the contact, and does not cover the side and top edges of the end of the moving knife rod. The optimization effect on the electric field distribution is not good enough, and the voltage resistance level is not high enough. In addition, in order to prevent the pressure-equalizing member from rotating and ensure that the pressure-equalizing member is installed in place, a raised pin structure needs to be provided on the pressure-equalizing member. The raised pin cooperates with the socket on the moving knife rod to achieve anti-rotation. This not only increases the design and processing difficulty of the pressure-equalizing member and the moving knife rod, but also requires the assembly accuracy of the two. Utility Model Content

[0004] In response to the shortcomings of the above-mentioned existing switch moving knife assemblies, the applicant provides a rationally structured moving contact structure. In addition to wrapping the outer side of the moving contact rod blade head, the voltage-equalizing cover also wraps the side and top edges of the blade tail. The electric field distribution is better optimized, the voltage resistance level is higher, and the anti-rotation structure is saved, which reduces the difficulty of design and processing and also reduces the requirements for assembly accuracy.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A moving contact structure includes a moving contact rod, the blade tail of the moving contact rod is rotatably connected to a stationary contact seat; the blade head of the moving contact rod is wrapped with a first pressure equalizing cover, and the first pressure equalizing cover is provided with an edge wrapped around the outer side of the blade head.

[0007] As a further improvement of the above technical solution:

[0008] The edging of the first pressure equalizing cover includes a side edging and a top edging. The side edging is arranged outside the side edge of the cutter head, and the top edging is arranged outside the top edge of the cutter head.

[0009] The first pressure equalizing cover has an edge covering arranged on the outer edge, and side edges thereof are respectively provided with side edges.

[0010] The cutter head of the moving contact rod is connected to the first pressure equalizing cover through a first pair of locking screws. A first compression spring is provided between the heads of the first pair of locking screws and the first pressure equalizing cover, and the first compression spring presses the first pressure equalizing cover onto the cutter head.

[0011] The first pressure equalizing cover is provided with a countersunk hole on the mounting hole for inserting the first pair of locking screws, and a step surface is formed at the bottom of the countersunk hole. The heads of the first pair of locking screws and the first compression spring are sunk into the countersunk hole, and the first compression spring is pressed against the step surface.

[0012] The blade tail of the moving contact rod is provided with a spherical protrusion, and the static contact seat is correspondingly provided with a spherical concave hole, and the protrusion and the concave hole are matched through the spherical surface.

[0013] The blade tail of the dynamic contact rod is connected to the static contact seat through a second pair of locking screws. A second compression spring is provided between the head of the second pair of locking screws and the blade tail, and the second compression spring presses the blade tail onto the static contact seat; the head of the second pair of locking screws is provided with a second pressure equalizing cover.

[0014] Two moving contact rods are provided, and the two moving contact rods are arranged face to face. The cutter heads of the two moving contact rods and the first pressure equalizing cover are connected through a first pair of locking screws.

[0015] A limiting sleeve is sleeved on the first pair of locking screws, and the limiting sleeve is located between the cutter heads of the two moving contact rods.

[0016] The blade tails of the two moving contact rods are respectively connected to the opposite sides of the static contact seat.

[0017] The beneficial effects of the utility model are as follows:

[0018] In addition to being fitted to the side of the cutter head, the first pressure-equalizing cover of the utility model is also wrapped around the side and top edges of the cutter head through edging, which has a better optimization effect on the electric field distribution and a higher voltage resistance level; the edging of the first pressure-equalizing cover not only plays a wrapping role, but also has anti-rotation and positioning functions. During installation, the edging of the first pressure-equalizing cover is snapped onto the outer edge and top edge of the cutter head to achieve positioning, and then the assembly is completed after being locked with the first pair of locking screws. This not only saves the setting of the anti-rotation structure, reduces the design and processing difficulty of the cutter head and the first pressure-equalizing cover, but also reduces the requirements for assembly accuracy and simplifies the assembly procedure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present utility model.

[0020] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0021] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0022] Figure 4 Schematic diagram of the structure of the first pressure equalizing cover.

[0023] In the figure: 1. Dynamic contact rod; 11. Cutting head; 12. Cutting tail; 121. Protrusion; 2. First pressure-equalizing cover; 21. Mounting hole; 211. Countersunk hole; 212. Step surface; 22. Side edging; 23. Top edging; 3. First pair of locking screws; 4. Limiting sleeve; 5. Static contact seat; 51. Concave hole; 6. Second pair of locking screws; 7. Second pressure-equalizing cover; 8. First compression spring; 9. Second compression spring. DETAILED DESCRIPTION

[0024] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0025] like Figure 1 As shown, the isolation knife assembly described in the utility model includes two moving contact rods 1 arranged face to face, and the knife head 11 of each moving contact rod 1 is provided with a first pressure equalizing cover 2 on the side facing away from the opposite moving contact rod 1. The knife tail 12 of each moving contact rod 1 is rotatably connected to the static contact seat 5, and the knife tails 12 of the two moving contact rods 1 are respectively connected to the opposite sides of the static contact seat 5.

[0026] like Figure 1 、 Figure 2 As shown, the blades 11 of the two moving contact rods 1 are connected together with the first pressure equalizing cover 2 by a first pair of locking screws 3. A limiting sleeve 4 is sleeved on the first pair of locking screws 3. The limiting sleeve 4 is located between the blades 11 of the two moving contact rods 1 to limit the two blades 11. A first compression spring 8 is provided between the heads of the first pair of locking screws 3 and the first pressure equalizing cover 2. The first compression spring 8 presses the first pressure equalizing cover 2 onto the blade 11. Figure 2 、 Figure 4 As shown, a mounting hole 21 is provided on the first pressure equalizing cover 2 corresponding to the first pair of locking screws 3, a countersunk hole 211 is provided on the side of the mounting hole 21 facing away from the cutter head 11, and a step surface 212 is formed at the bottom of the countersunk hole 211. The heads of the first pair of locking screws 3 and the first compression spring 8 are sunk into the countersunk hole 211, and the first compression spring 8 is pressed against the step surface 212, thereby pressing the first pressure equalizing cover 2.

[0027] like Figure 2 、 Figure 4As shown, the side edges of the first pressure-equalizing cover 2 are provided with side edging 22, and the top side edge is provided with top edging 23, and the side edging 22 and the top edging 23 are connected as a whole; the side edging 22 and the top edging 23 extend toward the direction of the cutter head 11, the side edging 22 is provided on the outside of the side edge of the cutter head 11, and the top edging 23 is provided on the outside of the top edge of the cutter head 11. In addition to being attached to the side of the cutter head 11, the first pressure-equalizing cover 2 is also wrapped around the side and top edges of the cutter head 11 through edging, which optimizes the electric field distribution and has a higher voltage resistance level; in addition to playing a wrapping role, the edging of the first pressure-equalizing cover 2 also has the functions of anti-rotation and positioning. During installation, the edging of the first pressure-equalizing cover 2 is snapped onto the outer side and top edge of the cutter head 11 to achieve positioning, and then the assembly is completed after being locked by the first pair of locking screws 3. This not only saves the setting of the anti-rotation structure and reduces the design and processing difficulty of the cutter head 11 and the first pressure-equalizing cover 2, but also reduces the requirements for assembly accuracy and simplifies the assembly procedure.

[0028] like Figure 1 、 Figure 3 As shown, the blade tails 12 of the two moving contact rods 1 are connected to the static contact seat 5 through the second pair of locking screws 6. A second compression spring 9 is provided between the heads of the second pair of locking screws 6 and the blade tail 12. The second compression spring 9 presses the blade tail 12 against the static contact seat 5. The heads of the second pair of locking screws 6 are provided with a second equalizing cover 7. The second equalizing cover 7 can evenly distribute the high electric field strength generated at the ends of the second pair of locking screws 6, optimize the electric field distribution, and improve the withstand voltage level. Figure 3 As shown, the blade tail 12 of each moving contact rod 1 is provided with a spherical protrusion 121 at the portion in contact with the static contact seat 5, and a spherical recessed hole 51 is correspondingly provided on the static contact seat 5. The protrusion 121 and the recessed hole 51 are matched through the spherical surface, so the matching area is larger and the current transmission is more reliable.

[0029] The above description is an explanation of the present invention, not a limitation of the present invention. The present invention may be modified in any form without violating the spirit of the present invention.

Claims

1. A moving contact structure, comprising a moving contact rod (1), wherein a blade tail (12) of the moving contact rod (1) is rotatably connected to a stationary contact seat (5); characterized in that: The blade head (11) of the moving contact rod (1) is provided with a first pressure-equalizing cover (2), and the first pressure-equalizing cover (2) is provided with an edge, which is wrapped around the outside of the blade head (11); the edge of the first pressure-equalizing cover (2) includes a side edge (22) and a top edge (23), the side edge (22) is wrapped around the outside of the side edge of the blade head (11), and the top edge (23) is wrapped around the outside of the top edge of the blade head (11); the edge of the first pressure-equalizing cover (2) is provided on the outer edge, and the side edges thereof are respectively provided with side edges (22); the blade tail (12) of the moving contact rod (1) is provided with a spherical protrusion (121), and a spherical concave hole (51) is correspondingly provided on the static contact seat (5), and the protrusion (121) and the concave hole (51) are matched through a spherical surface.

2. The movable contact structure according to claim 1, characterized in that: The cutter head (11) of the moving contact rod (1) is connected to the first pressure equalizing cover (2) via a first pair of locking screws (3). A first compression spring (8) is provided between the heads of the first pair of locking screws (3) and the first pressure equalizing cover (2). The first compression spring (8) presses the first pressure equalizing cover (2) onto the cutter head (11).

3. The movable contact structure according to claim 2, characterized in that: A countersunk hole (211) is provided on the first pressure equalizing cover (2) on the mounting hole (21) for inserting the first pair of locking screws (3). A step surface (212) is formed at the bottom of the countersunk hole (211). The heads of the first pair of locking screws (3) and the first compression spring (8) are sunk into the countersunk hole (211), and the first compression spring (8) is pressed against the step surface (212).

4. The movable contact structure according to claim 1, characterized in that: The blade tail (12) of the moving contact rod (1) is connected to the static contact seat (5) through a second pair of locking screws (6); a second compression spring (9) is provided between the head of the second pair of locking screws (6) and the blade tail (12); the second compression spring (9) presses the blade tail (12) onto the static contact seat (5); and a second pressure equalizing cover (7) is provided at the head of the second pair of locking screws (6).

5. The movable contact structure according to claim 1, characterized in that: Two moving contact rods (1) are provided, and the two moving contact rods (1) are arranged face to face. The cutter heads (11) of the two moving contact rods (1) are connected together with the first pressure equalizing cover (2) through a first pair of locking screws (3).

6. The movable contact structure according to claim 5, characterized in that: A limiting sleeve (4) is sleeved on the first pair of locking screws (3), and the limiting sleeve (4) is located between the cutter heads (11) of the two moving contact rods (1).

7. The movable contact structure according to claim 5, characterized in that: The blade tails (12) of the two moving contact rods (1) are respectively connected to opposite sides of the stationary contact seat (5).

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