Compact switch contact structure used in insulating liquid

Abstract

The invention provides a compact switch contact structure used in insulating liquid. The compact switch contact structure is used for solving the problem that an electric arc cannot be effectively extinguished in the prior art. The compact switch contact structure comprises an upper shell and a lower shell, the upper shell abuts against the lower shell through a supporting shaft, the lower shell is provided with a limiting guide groove, a moving plate slides on the limiting guide groove, static contact sets are arranged on the two sides of the moving plate in a mirroring mode, each static contact set is composed of two static contacts, the moving plate is provided with a moving contact set mounting hole, and the moving contact set mounting hole is connected with the limiting guide groove. A moving contact group is arranged in the moving contact group mounting hole and comprises two conductive plates which abut against each other through a contact spring. According to the invention, due to the particularity of the matching between the structure of the contact and the structure of the moving system, the moving contact drives the insulating medium in the relatively closed space to move together in the moving process, so that the arc blowing and extinguishing effect is achieved, the damage of the arc to the contact is reduced, and the service life of the switch contact is prolonged.

Description

Technical Field

[0001] The invention relates to the field of power switches, in particular to a compact switch contact structure used in insulating liquid. Background Art

[0002] In the power system, especially in high voltage and high current application scenarios, switch contacts are key components for circuit switching, and their performance is directly related to the stability and safety of the power system. In order to improve the working efficiency of switch contacts in harsh environments, especially when the contacts are immersed in insulating liquids to enhance insulation performance, higher requirements are placed on the design of the contact structure. In the manufacturing process of traditional contact structures, in order to ensure their strength and durability, the process is often more complicated. When switching circuits, the arc generated is difficult to extinguish quickly and effectively. The continued existence of the arc not only aggravates the erosion of the contacts, but may also cause the vaporization or even combustion of the insulating liquid, seriously threatening the safety of the equipment. Summary of the invention

[0003] The present invention provides a compact switch contact structure for use in insulating liquids, which simplifies the contact assembly process, reduces manufacturing costs, improves assembly efficiency, and solves the problem in the prior art that arcs cannot be effectively extinguished.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A compact switch contact structure for use in insulating liquid comprises an upper shell and a lower shell, the upper shell and the lower shell are abutted against each other via a support shaft, a limit guide groove is provided on the lower shell, a moving plate is slidably arranged on the limit guide groove, a static contact group is mirrored on both sides of the moving plate, the static contact group is composed of two static contacts, a moving contact group mounting hole is provided on the moving plate, a moving contact group is arranged in the moving contact group mounting hole, the moving contact group comprises two conductive plates, and the conductive plates are abutted against each other via a contact spring.

[0006] Furthermore, guide posts are provided at both ends of the moving contact group mounting hole along the moving direction of the moving plate, and a gap is provided between the guide posts for the conductive plate to pass through, and the conductive plates are respectively sleeved on the two guide posts through the contact piece mounting holes. The guide posts provide precise guidance for the conductive plates, ensure the stability of the moving contact group during movement, prevent deviation caused by vibration or impact, and thus ensure the reliability and durability of the switch.

[0007] Furthermore, the guide columns between the two conductive plates are sleeved with contact support plates, and both ends of the contact support plates close to each other are fixed with limiting bosses, and both ends of the contact spring are sleeved on the limiting bosses respectively. The contact support plates can provide additional support, enhance the structural rigidity of the entire moving contact group, and reduce deformation caused by the soft material of the conductive plate. The design of the limiting boss ensures the fixation of the contact spring and prevents the spring from accidentally falling off during switch operation or maintenance.

[0008] Furthermore, the bottom surface of the upper housing is provided with an upper static contact mounting groove corresponding to the static contact. By fixing the static contact in the mounting groove, the strength of the entire switch contact structure can be enhanced, and it is also helpful to disperse and withstand the stress and vibration generated during the switch operation, thereby improving the stability and durability of the entire structure.

[0009] Furthermore, the lower housing fixes the static contact through the lower static contact mounting groove, a wire outlet hole is provided on one side of the lower static contact mounting groove, a lead welding point is provided on the side wall of the static contact, and the lead welding point is placed in the wire outlet hole. By providing the wire outlet hole at the outer edge of each lower static contact mounting groove position of the lower housing, the space layout can be more reasonably utilized, the lead wires are avoided from being arranged in a disorderly manner inside the housing, and the safety hazards and performance problems caused by the crossing or entanglement of the lead wires are reduced.

[0010] Furthermore, an anti-rotation surface is provided on the installation hole of the moving contact group. The anti-rotation surface enables the moving contact piece to always move at a predetermined position, avoiding poor contact or misalignment caused by rotation, which not only improves the installation accuracy, but also enhances the stability of the moving contact group during long-term use.

[0011] Furthermore, the contact spring is a rectangular spring, and both ends of the rectangular spring are parallel to the conductive plate by grinding. The shape of the rectangular spring helps to distribute the contact force more evenly, reduce local stress concentration, and also has better vibration resistance, reducing contact instability caused by equipment vibration.

[0012] The beneficial effects that this technical solution can produce.

[0013] Due to the special coordination of the contact structure and the motion system structure, the present invention drives the insulating medium in the relatively closed space to move together during the movement of the moving contact piece, thereby achieving the effect of blowing and extinguishing the arc, improving the reliability and safety of the switch contact, and reducing the damage to the contact by the arc, thereby extending the service life of the switch contact. When the conductive plate on one side abuts against the static contact, the contact spring applies pressure to the moving contact piece to ensure that the conductive plate abuts against the static contact, and when the conductive plate at one end abuts against the static contact, the conductive plate at the other end can compress the spring and continue to move to perform secondary arc extinguishing, thereby achieving the purpose of improving the effect of blowing and extinguishing the arc, and also simplifying the assembly process of the contact, reducing the manufacturing cost, and improving the assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the explosion three-dimensional structure of the present invention;

[0017] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention;

[0018] Figure 4 It is a schematic diagram of the exploded three-dimensional structure of the upper housing and the static contact group of the present invention;

[0019] Figure 5 is a schematic diagram of the three-dimensional structure of the sports board of the present invention;

[0020] Figure 6 A top view of the present invention hiding the upper housing;

[0021] Figure 7 It is a schematic diagram of the exploded three-dimensional structure of the moving contact group of the present invention.

[0022] Wherein: 1. upper shell, 2. lower shell, 3. support shaft, 4. limiting guide groove, 5. moving plate, 6. static contact group, 8. moving contact group mounting hole, 9. moving contact group, 10. conductive plate, 11. contact spring, 12. guide column, 13. contact piece mounting hole, 14. contact piece support plate, 15. limiting boss, 16. upper static contact mounting groove, 17. lower static contact mounting groove, 18. wire outlet hole, 19. lead welding point, 20. anti-rotation surface. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of this embodiment, it is necessary to understand that the terms "center, longitudinal, lateral, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the invention.

[0025] like Figure 1-3 As shown in Figures 6, an embodiment of the present invention provides a compact switch contact structure for insulating liquid, including an upper shell 1 and a lower shell 2, the upper shell 1 and the lower shell 2 are abutted against each other through a support shaft 3, the lower shell 2 is provided with a limit guide groove 4, a moving plate 5 is slid on the limit guide groove 4, two groups of mirror-image static contact groups 6 are provided on the lower shell 2 on both sides of the moving plate 5, the static contact group 6 is composed of two static contacts, a moving contact group mounting hole 8 is provided on the moving plate 5, a moving contact group 9 is provided in the moving contact group mounting hole 8, the moving contact group 9 is placed between the two static contacts, the moving contact group 9 includes two conductive plates 10, the conductive plates 10 are connected to each other through a contact spring 11, and both ends of the conductive plate 10 can be abutted against the static contacts of the adjacent static contact group 6 at the same time.

[0026] Through the position of the contact, the cooperation of the moving plate 5 and the moving contact group 9, the surrounding dielectric oil is driven to move together during the movement of the moving contact piece. The close connection between the upper shell 1, the lower shell 2 and the moving plate 5 and the close cooperation between the moving contact group 9 and the static contact group 6 make it impossible for the moving dielectric oil to move along the direction of movement, and a vortex away from the direction of the contact piece will be formed on one side of the direction of movement. The oil flow of the vortex will blow away the arc generated by the contact contact, achieving an arc blowing and arc extinguishing effect. The overtravel movement of the conductive plate 10 can be achieved through the contact spring 11. The overtravel movement means that when the moving contact piece abuts against the adjacent static contact, the moving plate 5 can continue to move through the contact spring 11, and at the same time, the contact spring 11 applies pressure to the moving contact piece to ensure that the conductive plate 10 abuts against the static contact, and when the conductive plate 10 at one end abuts against the static contact, the conductive plate 10 at the other end can compress the spring and continue to move, perform secondary arc blowing and arc extinguishing, and achieve the purpose of improving the arc blowing and arc extinguishing effect. The stationary contact piece is a flat sheet structure, which is not only simple to process, but also can be quickly replaced when the contact material needs to be changed to adapt to different working environments or extend the service life, reducing downtime and maintenance costs. The contact spring 11 not only helps to make uniform contact and absorb the impact and vibration generated by the switch operation to a certain extent, but also facilitates the installation of the moving contact group 9. The use of the limiting guide groove 4 can ensure the stable movement of the moving plate 5 and reduce failures caused by movement deviation.

[0027] like Figure 2-5As shown in Figures 7 and 8, guide posts 12 are provided at both ends of the moving contact group mounting hole 8 along the moving direction of the moving plate 5, and gaps are provided between the guide posts 12 for the conductive plate 10 to pass through, and the conductive plates 10 are respectively mounted on the two guide posts 12 through the contact piece mounting holes 13. The guide posts 12 provide precise guidance for the movement of the conductive plate 10, ensure the stability of the conductive plate 10 during movement, help reduce poor contact or arcing caused by the deviation or shaking of the conductive plate 10, and further improve the reliability and safety of the electrical connection. By setting the cooperation between the guide posts 12 and the contact piece mounting holes 13, the conductive plate 10 can be easily aligned during the assembly process, making the installation of the moving contact group 9 simpler and faster, reducing the difficulty of assembly, and also reducing the difficulty of debugging and the error rate.

[0028] like Figure 7 As shown, the guide column 12 between the two conductive plates 10 is sleeved with a contact support sheet 14, and the two ends of the contact support sheet 14 close to each other are fixed with a limiting boss 15, and the two ends of the contact spring 11 are respectively sleeved on the limiting boss 15. The contact support sheet 14 provides additional support for the conductive plate 10, which can prevent the conductive plate 10 made of a softer material from deforming when it contacts and collides with the static contact, ensuring good contact between the conductive plate 10 and the static contact. The limiting boss 15 fixes the two ends of the contact spring 11 in appropriate positions, which not only prevents the contact spring 11 from shifting or falling off during operation, but also ensures the uniform distribution of the spring force, reduces local stress concentration, and thus improves the stability and life of the contact. The design of the contact support sheet 14 and the limiting boss 15 makes the structure of the entire moving contact group 9 more compact and simplified, which not only facilitates the processing and manufacturing of components, but also simplifies the assembly process, allowing assemblers to more easily assemble the conductive plate 10, the contact spring 11 and the contact support sheet 14 together, thereby improving assembly efficiency and accuracy.

[0029] like Figure 4 As shown, the bottom surface of the upper housing 1 is provided with an upper static contact mounting groove 16 corresponding to the static contact. The upper static contact mounting groove 16 provides a precise positioning and fixing position for the static contact, so that the static contact can more easily reach the predetermined position during the installation process without complicated adjustment and calibration work. This not only saves installation time, but also reduces the installation difficulty and error rate. It not only improves the installation accuracy, but also ensures the stability of the static contact during long-term use, and reduces poor contact or failure caused by looseness or offset.

[0030] like Figure 3 , 6As shown, the lower housing 2 fixes the static contact through the lower static contact mounting groove 17, and a wire outlet hole 18 is provided on one side of the lower static contact mounting groove 17. A lead soldering point 19 is provided on the side wall of the static contact, and the lead soldering point 19 is placed in the wire outlet hole 18. The wire outlet hole 18 allows the contact lead to be easily led out from the lower housing 2 without the need for additional tools or operations, thereby simplifying the wiring steps and improving assembly efficiency. The lead length can be determined according to actual needs, thereby adapting to different installation environments and wiring requirements. The lead soldering point 19 is placed in the wire outlet hole 18, which can reduce the impact of external vibration on the soldering point.

[0031] like Figure 5 As shown, the moving contact assembly mounting hole 8 is provided with an anti-rotation surface 20. The anti-rotation surface 20 allows the moving contact piece to be quickly and correctly installed in the mounting hole without additional adjustment or alignment, thereby improving assembly efficiency. The anti-rotation surface 20 ensures that the moving contact piece remains stable during movement, reduces the risk of poor contact or arcing caused by rotation, improves the reliability of electrical connection, and helps maintain stable operation of the electrical system.

[0032] The contact spring 11 is a rectangular spring, and the two ends of the rectangular spring are parallel to the conductive plate 10 through grinding. Compared with traditional circular or spiral springs, rectangular springs can provide a larger compression amount in the same space, so that under the same force, the rectangular spring can be compressed more effectively, thereby ensuring that the contact pressure between the contact and the static contact is more stable and reliable, and the rectangular spring is not easy to twist or deform during the compression process. The grinding treatment of the spring end ensures that the contact or spring will not be skewed due to the uneven end surface after installation, so that the moving contact piece can contact the static contact evenly and stably when subjected to the spring pressure, which helps to reduce the contact resistance, reduce the arc generation, and improve the reliability of the electrical connection.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A compact switch contact structure for use in an insulating liquid, characterized in that: The invention comprises an upper shell (1) and a lower shell (2), wherein the upper shell (1) and the lower shell (2) are butted against each other via a support shaft (3), the lower shell (2) is provided with a limit guide groove (4), a moving plate (5) is slidably arranged on the limit guide groove (4), a static contact group (6) is arranged on both sides of the moving plate (5), the static contact group (6) is composed of two static contacts, a moving contact group mounting hole (8) is arranged on the moving plate (5), a moving contact group (9) is arranged in the moving contact group mounting hole (8), the moving contact group (9) comprises two conductive plates (10), and the conductive plates (10) are butted against each other via a contact spring (11).

2. A compact switch contact structure for use in insulating liquid according to claim 1, characterized in that: Guide columns (12) are provided at both ends of the moving contact group mounting hole (8) along the moving direction of the moving plate (5), gaps are provided between the guide columns (12) for the conductive plate (10) to pass through, and the conductive plates (10) are respectively sleeved on the two guide columns (12) through the contact piece mounting holes (13).

3. A compact switch contact structure for use in insulating liquid according to claim 2, characterized in that: The guide pillars (12) between the two conductive plates (10) are sleeved with contact support plates (14), and both ends of the contact support plates (14) close to each other are fixed with limiting bosses (15), and both ends of the contact spring (11) are sleeved on the limiting bosses (15) respectively.

4. A compact switch contact structure for use in insulating liquid according to claim 1, characterized in that: The bottom surface of the upper housing (1) is provided with an upper stationary contact mounting groove (16) corresponding to the stationary contact.

5. A compact switch contact structure for use in insulating liquid according to claim 1, characterized in that: The lower housing (2) fixes the stationary contact via a lower stationary contact mounting groove (17); a wire outlet hole (18) is provided on one side of the lower stationary contact mounting groove (17); a lead wire welding point (19) is provided on the side wall of the stationary contact; and the lead wire welding point (19) is placed in the wire outlet hole (18).

6. A compact switch contact structure for use in insulating liquid according to claim 1, characterized in that: An anti-rotation surface (20) is provided on the moving contact group mounting hole (8).

7. A compact switch contact structure for use in insulating liquid according to claim 1, characterized in that: The contact spring (11) is a rectangular spring, and both ends of the rectangular spring are ground flat to be parallel to the conductive plate (10).

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