Moving contact structure and isolating switch

Abstract

The utility model belongs to the technical field of switches, and discloses a moving contact structure and an isolating switch, the moving contact structure comprises an insulating main shaft, a moving contact knife and an elastic sleeve, the insulating main shaft comprises a shaft body and a crank arm arranged at the periphery of the shaft body, and the end part of the crank arm is provided with a mounting groove; the first end of the movable contact knife penetrates through the mounting groove, and the second end of the movable contact knife protrudes out of the mounting groove; the elastic sleeve is at least partially arranged in the mounting groove and sleeves the moving contact knife, the outer peripheral side wall of the elastic sleeve abuts against the groove wall of the mounting groove, and the inner peripheral side wall of the elastic sleeve abuts against the periphery of the moving contact knife. According to the moving contact structure provided by the utility model, the elastic sleeve can absorb most of inertial energy during opening and closing of the moving contact knife due to the deformability, and the inertial impact of the moving contact knife on the crank arm is effectively reduced, so that the risk of breakage of the insulating main shaft is reduced, and the mechanical life of the moving contact structure is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to switch technical field especially, relate to a kind of movable contact structure and disconnecting switch. BACKGROUND

[0002] The three-position disconnecting switch in medium-voltage gas-insulated switchgear generally adopts rotating blade structure, and the movable contact blade is driven by the insulating main shaft to open and close, which has the advantages of high stability and good synchronism.

[0003] In the related art, the insulating main shaft is usually provided with a crank arm, and the movable contact blade is inserted into the crank arm. When the disconnecting switch is opened and closed, the movable contact blade moves quickly and has high inertial energy, thereby causing a large inertial impact on the crank arm, and the insulating main shaft is at risk of breaking. SUMMARY

[0004] One object of the utility model is to provide a movable contact structure that effectively reduces the inertial impact of the movable contact blade on the crank arm.

[0005] To achieve this object, the utility model adopts the following technical solutions:

[0006] A movable contact structure is provided, comprising:

[0007] An insulating main shaft, comprising a shaft body and a crank arm provided on the periphery of the shaft body, and an installation slot is provided at the end of the crank arm;

[0008] A movable contact blade, the first end of the movable contact blade is provided in the installation slot, and the second end of the movable contact blade protrudes from the installation slot;

[0009] An elastic sleeve, at least partially provided in the installation slot and sleeved on the movable contact blade, and the outer peripheral sidewall of the elastic sleeve abuts against the slot wall of the installation slot, and the inner peripheral sidewall of the elastic sleeve abuts against the periphery of the movable contact blade.

[0010] Optionally, one end of the elastic sleeve away from the shaft body is provided in the installation slot.

[0011] Optionally, the distance between one end of the elastic sleeve away from the shaft body and the end of the crank arm is less than or equal to 10 mm.

[0012] Optionally, a positioning slot is provided on the slot wall of the installation slot, the elastic sleeve is provided in the positioning slot, and the inner peripheral sidewall of the elastic sleeve protrudes from the positioning slot.

[0013] Optionally, the elastic sleeve comprises two parallel elastic walls, and the two elastic walls hold the movable contact blade.

[0014] Optionally, a reinforcing rib is provided between the crank arm and the shaft body.

[0015] Optionally, a plurality of the toggle arms are arranged on the shaft body in an axial direction, and the movable contactor and the elastic sleeve are each provided with a plurality of the toggle arms in one-to-one correspondence.

[0016] Optionally, the inner circumferential side wall of the elastic sleeve is provided with a conductive coating, and the inner circumferential side wall of the elastic sleeve is in abutment with the circumferential portion of the movable contactor through the conductive coating.

[0017] Optionally, the elastic sleeve is made of rubber.

[0018] Another purpose of the utility model lies in providing an isolating switch comprising the movable contact structure.

[0019] Beneficial effects: the movable contact structure provided by the utility model can absorb most of the inertial energy of the movable contactor by the deformation capacity of the elastic sleeve, effectively reduce the inertial impact of the movable contactor on the toggle arm, and thus reduce the risk of fracture of the insulating main shaft and improve the mechanical life of the movable contact structure.

[0020] The isolating switch provided by the utility model can effectively reduce the risk of fracture of the insulating main shaft and improve the mechanical life of the isolating switch. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of the movable contact structure provided by the utility model;

[0022] Figure 2 is another sectional view of the movable contact structure provided by the utility model;

[0023] Figure 3 is a sectional view of the movable contact structure provided by the utility model; Figure 1 is an enlarged view of A in the figure;

[0024] Figure 4 is a structural schematic view of the elastic sleeve provided by the utility model;

[0025] Figure 5 is a partial structure explosion view of the isolating switch provided by the utility model.

[0026] In the figure:

[0027] 100, insulating main shaft; 110, shaft body; 120, toggle arm; 121, mounting groove; 122, positioning groove; 130, reinforcing rib;

[0028] 200, movable contactor; 210, movable contact piece;

[0029] 300, elastic sleeve; 301, elastic wall; 310, conductive coating;

[0030] 400, stationary contact;

[0031] 500, ground contact. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.

[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0036] Referring to Figures 1 to 4 As shown in the drawings, the embodiment provides a movable contact structure, and the movable contact structure comprises an insulating main shaft 100, a movable contact blade 200 and an elastic sleeve 300.

[0037] Specifically, the insulating main shaft 100 comprises a shaft body 110 and a crank 120 arranged at the periphery of the shaft body 110, and the end of the crank 120 is provided with a mounting groove 121; the first end of the moving contact blade 200 is arranged in the mounting groove 121, and the second end of the moving contact blade 200 protrudes from the mounting groove 121; the elastic sleeve 300 is arranged at least partially in the mounting groove 121 and sleeved on the moving contact blade 200, and the outer peripheral side wall of the elastic sleeve 300 abuts against the groove wall of the mounting groove 121, and the inner peripheral side wall of the elastic sleeve 300 abuts against the periphery of the moving contact blade 200.

[0038] In the embodiment, the elastic sleeve 300 is arranged between the moving contact blade 200 and the crank 120, and when the insulating main shaft 100 drives the moving contact blade 200 to open and close, because the outer peripheral side wall of the elastic sleeve 300 abuts against the groove wall of the mounting groove 121, and the inner peripheral side wall of the elastic sleeve 300 abuts against the periphery of the moving contact blade 200, the elastic sleeve 300 can absorb most of the inertial energy on the moving contact blade 200 by the deformation capacity, effectively reducing the inertial impact of the moving contact blade 200 on the crank 120, thereby reducing the risk of fracture of the insulating main shaft 100 and improving the mechanical life of the moving contact structure.

[0039] Exemplarily, the crank 120 extends along the radial direction of the shaft body 110.

[0040] Exemplarily, a reinforcing rib 130 is arranged between the crank 120 and the shaft body 110, so as to further reduce the risk of fracture of the insulating main shaft 100 and improve the mechanical life of the moving contact structure. Exemplarily, at least one reinforcing rib 130, for example, two to six reinforcing ribs 130, is arranged on each side of the shaft body 110 in the axial direction of the crank 120.

[0041] In a feasible implementation manner, as shown in Figure 1 the end of the elastic sleeve 300 away from the shaft body 110 is arranged in the mounting groove 121, the elastic sleeve 300 is more uniformly extruded by the crank 120 and the moving contact blade 200, effectively preventing the occurrence of the situation that the local stress of the elastic member is too large, so as to improve the service life of the elastic sleeve 300 and enable the elastic sleeve 300 to absorb more inertial energy on the moving contact blade 200.

[0042] In a feasible implementation manner, as shown in Figure 1 and Figure 3 a positioning groove 122 is arranged on the groove wall of the mounting groove 121, and the elastic sleeve 300 is arranged in the positioning groove 122, so as to facilitate the positioning assembly of the elastic sleeve 300 relative to the insulating main shaft 100. In the embodiment, the inner peripheral side wall of the elastic sleeve 300 protrudes from the positioning groove 122, which can prevent the moving contact blade 200 from being damaged due to the deformation of the elastic sleeve 300 and the groove wall of the mounting groove 121 when the moving contact blade 200 is opened and closed, while ensuring that the elastic sleeve 300 can absorb the inertial energy on the moving contact blade 200.

[0043] Exemplarily, the positioning groove 122 is configured as an annular groove, and the outer circumferential sidewall of the elastic sleeve 300 is attached to the groove bottom surface of the positioning groove 122, so that the elastic sleeve 300 is more uniformly extruded by the toggle arm 120.

[0044] Exemplarily, when the end of the elastic sleeve 300 away from the shaft body 110 is arranged in the mounting groove 121, the distance L between the end of the elastic sleeve 300 away from the shaft body 110 and the end of the toggle arm 120 is less than or equal to 10 mm, for example, 3 mm, 5 mm, 6 mm or 8 mm, facilitating assembly of the elastic sleeve 300 in the positioning groove 122, and further preventing the moving contact blade 200 from being damaged due to deformation of the elastic sleeve 300 and the groove wall of the mounting groove 121 during opening and closing.

[0045] Exemplarily, the two sidewalls of the positioning groove 122 along the extension direction of the toggle arm 120 clamp and limit the elastic sleeve 300, effectively preventing the elastic sleeve 300 from moving relative to the toggle arm 120.

[0046] In a feasible implementation, as shown in Figure 1 , Figure 2 and Figure 4 , the elastic sleeve 300 includes two parallel elastic walls 301, and the two elastic walls 301 clamp the moving contact blade 200, so that the elastic sleeve 300 can absorb most of the inertial energy of the moving contact blade 200 by relying on its own deformation capacity.

[0047] Exemplarily, the elastic sleeve 300 can be configured as a waist type to facilitate molding and manufacturing of the elastic sleeve 300. It can be understood that, the inner wall of the elastic sleeve 300 has a gap between the remaining part except the part of the two elastic walls 301 clamping the moving contact blade 200 and the moving contact blade 200, facilitating assembly between the elastic sleeve 300 and the moving contact blade 200.

[0048] In a feasible implementation, the shaft body 110 is provided with a plurality of toggle arms 120 spaced along the axial direction, and the moving contact blade 200 and the elastic sleeve 300 are each provided with a plurality of and correspondingly arranged with the plurality of toggle arms 120, so as to improve the applicability of the moving contact structure. Of course, the shaft body 110 can also be provided with only one toggle arm 120.

[0049] In the embodiment, there is an air gap between the abutting positions of the moving contact blade 200 and the elastic sleeve 300. In order to prevent the moving contact blade 200 from generating discharge at the air gap during opening and closing, it is continued to refer to Figures 1 to 4As shown, the inner circumferential side wall of the elastic sleeve 300 is provided with a conductive coating 310, and the inner circumferential side wall of the elastic sleeve 300 abuts against the circumferential part of the movable contact blade 200 through the conductive coating 310. It can be understood that, because the elastic sleeve 300 has elastic deformation, and the inner circumferential side wall of the elastic sleeve 300 will be compressed under the extrusion of the movable contact blade 200, that is, the movable contact blade 200 is always in close contact with the conductive coating 310, ensuring that the movable contact blade 200 is always in electrical communication with the conductive coating 310, so that the conductive coating 310 has good electric field shielding effect, which can effectively avoid the discharge of the movable contact blade 200 at the air gap during opening or closing, and is safe and reliable.

[0050] In the electric field simulation test, under the same conditions, the maximum field strength at the junction of the movable contact blade 200 and the crank arm 120 in the traditional disconnecting switch is 8.2 kV / mm, while in the present embodiment, through the arrangement of the conductive coating 310, the maximum field strength at the junction of the movable contact blade 200 and the crank arm 120 and the elastic sleeve 300 is 0.4 kV / mm, the electric field shielding effect is obvious, and the insulation performance of the movable contact structure is effectively improved.

[0051] Exemplarily, the material of the elastic sleeve 300 is rubber material, for example, polyurethane rubber, which has good buffering and damping performance, good wear resistance, tear resistance, aging resistance, and good electrical insulation properties. In addition, the conductive coating 310 is sprayed on the rubber material elastic sleeve 300, and the conductive coating 310 can be firmly attached to the elastic sleeve 300.

[0052] In a feasible implementation manner, as shown in Figure 3 The minimum gap H between the groove wall of the mounting groove 121 and the circumferential part of the movable contact blade 200 is 2 mm-5 mm, for example, 2.5 mm, 3 mm, 3.5 mm or 4 mm, to prevent discharge and ensure safety and reliability.

[0053] In the present embodiment, the movable contact blade 200 includes two movable contact pieces 210, and a clamping gap is formed between the two movable contact pieces 210. The two movable contact pieces 210 clamp the static contact 400 or the ground contact 500 through the clamping gap, which is stable and reliable.

[0054] Referring to Figures 1 to 5 The present embodiment also provides a disconnecting switch, which includes the above-mentioned movable contact structure. Through the arrangement of the movable contact structure, the risk of fracture of the insulating main shaft 100 is effectively reduced, and the mechanical life of the disconnecting switch is improved.

[0055] Specifically, the disconnecting switch further includes a base (not shown), and the movable contact structure is rotatably connected to the base through the shaft body 110 of the insulating main shaft 100.

[0056] Specifically, the isolating switch further comprises a static contact 400, the dynamic contact blade 200 of the dynamic contact structure is contacted and separated with the static contact 400, so as to realize closing and opening of the isolating switch.

[0057] In a feasible implementation, the isolating switch further comprises a grounding contact 500, the dynamic contact blade 200 can be contacted and conducted with the grounding contact 500, so as to realize the grounding function of the isolating switch, thereby ensuring safe operation of the equipment connected with the isolating switch and life safety of the staff.

[0058] In the embodiment, the dynamic contact blade 200, the static contact 400 and the grounding contact 500 are arranged one by one.

[0059] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A moving contact structure, characterized by, The application relates to an insulating main shaft (100) comprising a shaft body (110) and a crank arm (120) arranged at the periphery of the shaft body (110), wherein the end of the crank arm (120) is provided with a mounting groove (121); a moving contact blade (200), wherein the first end of the moving contact blade (200) is arranged in the mounting groove (121), and the second end of the moving contact blade (200) protrudes from the mounting groove (121); and an elastic sleeve (300), wherein the elastic sleeve (300) is arranged at least partially in the mounting groove (121) and covers the moving contact blade (200), the outer peripheral side wall of the elastic sleeve (300) abuts against the groove wall of the mounting groove (121), and the inner peripheral side wall of the elastic sleeve (300) abuts against the periphery of the moving contact blade (200). The end of the elastic sleeve (300) away from the shaft body (110) is arranged in the mounting groove (121). The distance between the end of the elastic sleeve (300) away from the shaft body (110) and the end of the crank arm (120) is less than or equal to 10 mm. The groove wall of the mounting groove (121) is provided with a positioning groove (122), the elastic sleeve (300) is arranged in the positioning groove (122), and the inner peripheral side wall of the elastic sleeve (300) protrudes from the positioning groove (122).

2. The moving contact structure according to claim 1, wherein The elastic sleeve (300) comprises two parallel elastic walls (301) which clamp the moving contact blade (200).

3. The moving contact structure according to claim 2, wherein The crank arm (120) and the shaft body (110) are provided with a reinforcing rib (130).

4. The moving contact structure according to claim 2, wherein The shaft body (110) is provided with a plurality of crank arms (120) arranged at intervals along the axial direction, and the moving contact blade (200) and the elastic sleeve (300) are each provided with a plurality of corresponding crank arms (120).

5. The moving contact structure of claim 1, wherein The inner peripheral side wall of the elastic sleeve (300) is provided with a conductive coating (310), and the inner peripheral side wall of the elastic sleeve (300) abuts against the periphery of the moving contact blade (200) through the conductive coating (310).

6. The moving contact structure of claim 1, wherein The material of the elastic sleeve (300) is rubber.

7. The moving contact structure of claim 1, wherein The application further relates to a moving contact structure comprising the moving contact structure as claimed in any one of claims 1-9.

8. The moving contact structure according to any one of claims 1 to 7, characterized by, ​ 9. The moving contact structure of claim 8, wherein ​ 10. A disconnector, characterized in that ​

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