Isolation rotation module and isolation switch
By installing a conductive voltage equalizing component between the moving contact blade and the crank arm, the discharge problem caused by the gap between the moving contact blade and the crank arm was solved, thus achieving safe and stable operation and extended lifespan of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-03-24
AI Technical Summary
There is a tiny gap between the moving contact blade and the crank arm of the three-position isolation rotating module in the existing medium-voltage gas-filled switchgear. This gap forms a three-interface gap under the action of dry air, which can easily cause discharge and affect the safe operation of the equipment.
A conductive equalizing element, such as a conductive metal ring or a conductive silicone ring, is installed between the moving contact blade and the crank arm to shield the three-way junction gap. The conductive equalizing element abuts against the outer wall of the moving contact blade to form an electric field shield and prevent partial discharge.
It effectively reduces the electric field strength of the three-junction gap, avoids partial discharge, extends equipment life and ensures safe operation.
Smart Images
Figure CN224036285U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of disconnecting switch especially relates to isolation rotation module and disconnecting switch. BACKGROUND
[0002] The three-position isolation rotation module in the medium voltage gas-filled cabinet generally adopts a rotating blade structure, and the moving contact blade metal blade is driven by the insulating main shaft to make opening and closing movement, which has the advantages of high stability and good synchronism. The crank arm of the insulating main shaft wraps the moving contact blade, so that the moving contact blade makes rotary movement, thereby realizing opening and closing.
[0003] However, since the crank arm of the insulating main shaft surrounds the moving contact blade metal blade, but cannot completely fit, there must be a small gap at the matching part, and a "three-intersection gap" is formed under the interaction with the dry air medium. The gap is prone to discharge during the energized operation of the isolation rotation module, and the long-term operation of the equipment is prone to flashover failure, which endangers the safe operation of the switchgear. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing an isolation rotation module and a disconnecting switch to avoid partial discharge between the moving contact blade and the inner wall of the crank arm.
[0005] To achieve this purpose, the utility model adopts the following technical solutions:
[0006] The isolation rotation module comprises an insulating main shaft, a crank arm, a moving contact blade and a shielding cover, one end of the crank arm is arranged on the insulating main shaft, the first end of the moving contact blade is connected to the other end of the crank arm, and the shielding cover is arranged at the second end of the moving contact blade.
[0007] The conductive voltage-sharing part is sleeved on the moving contact blade and located between the crank arm and the shielding cover, and the inner wall of the conductive voltage-sharing part abuts against the outer wall of the moving contact blade.
[0008] As an optional solution of the isolation rotation module, the conductive voltage-sharing part comprises a conductive metal ring, and the conductive metal ring is fixedly sleeved on the moving contact blade and located between the crank arm and the shielding cover.
[0009] As an optional solution of the isolation rotation module, a first mounting hole is arranged on the annular wall of the conductive metal ring, a second mounting hole is arranged on the moving contact blade, and the first mounting hole is connected to the second mounting hole through a first fastener.
[0010] As an optional solution of the isolation rotation module, an anti-skid structure is arranged on the inner wall surface of the conductive voltage-sharing part, and the anti-skid structure abuts against the outer wall surface of the moving contact blade.
[0011] As an optional solution of the isolation rotating module, the conductive voltage equalizing member comprises a conductive silica gel ring, and the conductive silica gel ring is fixedly sleeved on the movable contact blade and located between the crank arm and the shielding cover.
[0012] As an optional solution of the isolation rotating module, a limiting groove is annularly arranged on the movable contact blade, and the conductive silica gel ring is embedded in the limiting groove.
[0013] As an optional solution of the isolation rotating module, a third mounting hole is arranged on the shielding cover, and a fourth mounting hole is arranged on the second end of the movable contact blade, and the third mounting hole is connected with the fourth mounting hole through a second fastener.
[0014] As an optional solution of the isolation rotating module, a plurality of reinforcing rib plates are arranged on the outer wall of the crank arm.
[0015] As an optional solution of the isolation rotating module, a plurality of annular reinforcing rib strips are arranged on the outer wall of the insulating main shaft.
[0016] The isolation switch comprises a frame, an isolation blade static end module, a grounding contact module and the isolation rotating module as described above, the isolation blade static end module, the grounding contact module and the isolation rotating module are arranged on the frame, and the isolation rotating module is rotationally connected with the frame.
[0017] Compared with the prior art, the isolation switch has the following beneficial effects:
[0018] The isolation rotating module is characterized in that the hollow crank arm is mounted on the insulating main shaft, the first end of the movable contact blade is located in the crank arm and connected with the crank arm, the second end of the movable contact blade extends out of the crank arm and is used for opening and closing the switch, the shielding cover is arranged on the second end of the movable contact blade, the tip part of the movable contact blade is shielded, a small gap exists between the movable contact blade and the crank arm, and the gap forms a three-intersection gap under the interaction with dry air medium, the conductive voltage equalizing member is located between the crank arm and the shielding cover, the three-intersection gap between the movable contact blade and the inner wall of the crank arm is covered by arranging the conductive voltage equalizing member on the movable contact blade, the electric field at the three-intersection gap can be shielded by the conductive voltage equalizing member under the action of voltage, the electric field strength of the three-intersection gap is still low even under high voltage, local discharge is avoided, the service life of the power equipment is prolonged, and personal safety is ensured.
[0019] The isolation switch is characterized in that the isolation blade static end module, the grounding contact module and the isolation rotating module are arranged on the frame, and the isolation rotating module is rotationally connected with the frame. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 is a structure schematic view of the shielding cover installed on the isolation rotating module of the isolating switch in the embodiment of the utility model;
[0021] Figure 2 is a structure schematic view of the shielding cover and the conductive metal ring installed on the isolation rotating module of the isolating switch in the embodiment of the utility model;
[0022] Figure 3 is a structure schematic view of the shielding cover and the conductive metal ring installed on the moving contactor in the embodiment of the utility model;
[0023] Figure 4 is an explosion structure schematic view of the shielding cover and the conductive metal ring installed on the moving contactor in the embodiment of the utility model;
[0024] Figure 5 is a structure schematic view of the shielding cover and the conductive silicone ring installed on the isolation rotating module of the isolating switch in the embodiment of the utility model;
[0025] Figure 6 is a structure schematic view of the shielding cover and the conductive silicone ring installed on the moving contactor in the embodiment of the utility model.
[0026] In the drawings:
[0027] 100, isolation rotating module; 200, isolation contactor static end module; 300, grounding contact module;
[0028] 1, insulating main shaft; 11, annular reinforcing rib; 2, crank arm; 21, reinforcing rib plate; 3, moving contactor; 31, second mounting hole; 32, limiting groove; 33, fourth mounting hole; 4, conductive voltage-sharing part; 41, first mounting hole; 42, anti-skid structure; 5, first fastener; 6, shielding cover; 61, third mounting hole; 7, second fastener. DETAILED DESCRIPTION
[0029] The utility model will be further explained in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described here are only used to explain the utility model, and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all the structures.
[0030] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element's mutual action relation.For the ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.
[0031] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.
[0032] In the description of the embodiment, the terms "up", "down", "right", etc. The orientation or position relationship shown in the drawing is based on the orientation or position relationship, only for the convenience of description and simplification 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 cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.It should be understood that the term "and / or" used in this paper is only a description of the association relationship of the associated object, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone.
[0033] In order to eliminate the problem that the gap between the moving contact and the inner wall of the crank arm is easy to cause partial discharge, the embodiment provides an isolation rotating module and an isolating switch, which will be described below Figures 1 to 6 The specific content of the embodiment is described in detail.
[0034] Embodiment one
[0035] As Figures 1 to 4As shown, the isolation rotation module 100 in this embodiment includes an insulated spindle 1, a hollow crank arm 2, a shielding cover 6, and a moving contact blade 3. One end of the crank arm 2 is mounted on the insulated spindle 1, and the first end of the moving contact blade 3 is connected to the other end of the crank arm 2. The shielding cover 6 is mounted on the second end of the moving contact blade 3. By installing the shielding cover 6 on the second end of the moving contact blade 3, the tip of the moving contact blade 3 can be shielded. The isolation rotation module 100 also includes a conductive equalizing element 4, which is sleeved on the moving contact blade 3 and located between the crank arm 2 and the shielding cover 6. The inner wall of the conductive equalizing element 4 abuts against the outer wall of the moving contact blade 3. The conductive equalizing element 4 and the moving contact blade 3 are at the same potential, and the conductive equalizing element 4 forms an electric field shielding effect on the gap between the crank arm 2 and the moving contact blade 3.
[0036] In this embodiment, the first end of the moving contact 3 is located inside and connected to the crank arm 2, while the second end of the moving contact 3 extends out from the crank arm 2 for opening and closing the circuit breaker. A small gap exists at the interface between the moving contact 3 and the crank arm 2, forming a three-junction gap through interaction with the dry air medium. A conductive equalizing element 4 is located between the crank arm 2 and the shielding cover 6. By installing the conductive equalizing element 4 on the moving contact 3, the three-junction gap between the moving contact 3 and the inner wall of the crank arm 2 is enclosed, providing electric field shielding for this three-junction gap when voltage is applied. Even under high voltage conditions, the electric field strength of this gas three-junction gap remains low, preventing partial discharge, extending the lifespan of electrical equipment, and ensuring personal safety.
[0037] For example, the conductive equalizing element 4 includes a conductive metal ring, which is fixedly sleeved on the moving contact blade 3 and located between the crank arm 2 and the shield 6. The conductive metal ring can be made of, but is not limited to, copper or aluminum, and no further restrictions are imposed here.
[0038] Furthermore, a first mounting hole 41 is provided on the annular wall of the conductive metal ring, and a second mounting hole 31 is provided on the moving contact 3. The first mounting hole 41 is connected to the second mounting hole 31 by a first fastener 5. For example, the first fastener 5 can be, but is not limited to, a bolt or screw. The conductive metal ring is installed onto the moving contact 3 by the first fastener 5, ensuring a stable connection between the two.
[0039] Furthermore, such as Figure 4 As shown, the inner wall surface of the conductive equalizing component 4 is provided with an anti-slip structure 42, which abuts against the outer wall surface of the moving contact blade 3. The anti-slip structure 42 can be, but is not limited to, anti-slip protrusions, anti-slip grooves, or anti-slip patterns. By adding the anti-slip structure 42, the contact friction between the conductive equalizing component 4 and the moving contact blade 3 can be increased, preventing them from becoming loose.
[0040] For example, such as Figure 2As shown, the outer wall of the crank arm 2 is provided with a plurality of reinforcing ribs 21; and / or the outer wall of the insulating main shaft 1 is provided with a plurality of annular reinforcing ribs 11. By adding reinforcing ribs 21 to the crank arm 2, the structural strength of the crank arm 2 can be improved, and the service life can be prolonged. By adding annular reinforcing ribs 11 to the outer wall of the insulating main shaft 1, not only the structural strength of the insulating main shaft 1 can be improved, but also the creepage distance between phases and between phase and ground can be increased to enhance the insulation.
[0041] As shown in Figure 1 , Figure 2 and Figure 5 , the embodiment also provides an isolating switch, which comprises a frame, an isolating knife static end module 200, a grounding contact module 300 and the above-mentioned isolating rotating module 100, the isolating knife static end module 200, the grounding contact module 300 and the isolating rotating module 100 are all arranged on the frame, and the isolating rotating module 100 is rotationally connected with the frame. The opening and closing of the isolating switch and grounding are realized by rotating the isolating rotating module 100. Since the conductive grading piece 4 is arranged on the moving contact knife 3, the problem of local discharge easily occurring between the moving contact knife 3 and the inner wall of the crank arm 2 is eliminated. By adding the shielding cover 6, the electric field distribution of the isolating rotating module 100 is effectively improved, the insulation withstand voltage level between short-distance breaks is improved, and the volume of the isolating rotating module 100 is reduced.
[0042] Embodiment two
[0043] The embodiment provides an isolating rotating module 100, which has the same basic structure as that of the first embodiment, and only the arrangement of the conductive grading piece 4 is different. The same structure as that of the first embodiment will not be described here.
[0044] Further, as shown in Figure 5 in combination with Figure 6 , the conductive grading piece 4 comprises a conductive silica gel ring, which is fixedly sleeved on the moving contact knife 3 and located between the crank arm 2 and the shielding cover 6. The conductive silica gel ring has conductive particles, and the conductive particles on the conductive grading piece 4 form an electric field shielding effect on the tiny three-intersection gap at the matching position, thereby solving the risk of three-intersection gap discharge at the matching position between the crank arm 2 and the moving contact knife 3 on the traditional insulating main shaft 1, avoiding discharge along the gap at the matching position during the operation of the isolating switch, and preventing local discharge, thereby playing a role in blocking the overflow of the electric field at the three-intersection gap.
[0045] Further, a limiting groove 32 is annularly arranged on the moving contact knife 3, and the conductive silica gel ring is embedded in the limiting groove 32. By adding the limiting groove 32, the installation position of the conductive silica gel ring on the moving contact knife 3 is limited, which helps to avoid the conductive silica gel ring from falling off the moving contact knife 3.
[0046] Further, the shield cover 6 is provided with a third mounting hole 61, and the second end of the moving contact blade 3 is provided with a fourth mounting hole 33, and the third mounting hole 61 is connected with the fourth mounting hole 33 through a second fastener 7.
[0047] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application claims.
Claims
1. An isolation rotation module, characterized in that, The isolation rotation module includes an insulated spindle (1), a crank arm (2), a moving contact blade (3), and a shield (6). One end of the crank arm (2) is mounted on the insulated spindle (1), the first end of the moving contact blade (3) is connected to the other end of the crank arm (2), and the shield (6) is mounted on the second end of the moving contact blade (3). The isolation rotation module also includes: A conductive equalizing element (4) is sleeved on the moving contact knife (3) and located between the crank arm (2) and the shield (6). The inner wall of the conductive equalizing element (4) abuts against the outer wall of the moving contact knife (3).
2. The isolation rotation module according to claim 1, characterized in that, The conductive equalizing component (4) includes a conductive metal ring, which is fixedly sleeved on the moving contact knife (3) and located between the crank arm (2) and the shield (6).
3. The isolation rotation module according to claim 2, characterized in that, The conductive metal ring has a first mounting hole (41) on its annular wall and the moving contact blade (3) has a second mounting hole (31). The first mounting hole (41) is connected to the second mounting hole (31) by a first fastener (5).
4. The isolation rotation module according to claim 2, characterized in that, The inner wall surface of the conductive equalizing component (4) is provided with an anti-slip structure (42), which abuts against the outer wall surface of the moving contact blade (3).
5. The isolation rotation module according to claim 1, characterized in that, The conductive equalizing component (4) includes a conductive silicone ring, which is fixedly sleeved on the moving contact knife (3) and located between the crank arm (2) and the shield (6).
6. The isolation rotation module according to claim 5, characterized in that, The moving contact blade (3) is provided with a limiting groove (32) in an annular shape, and the conductive silicone ring is embedded in the limiting groove (32).
7. The isolation rotation module according to any one of claims 1-6, characterized in that, The shield (6) is provided with a third mounting hole (61), and the second end of the moving contact knife (3) is provided with a fourth mounting hole (33). The third mounting hole (61) is connected to the fourth mounting hole (33) through a second fastener (7).
8. The isolation rotation module according to claim 7, characterized in that, The outer wall of the crank arm (2) is provided with several reinforcing ribs (21).
9. The isolation rotation module according to claim 7, characterized in that, The outer wall of the insulating spindle (1) is provided with several annular reinforcing ribs (11).
10. A disconnecting switch, characterized in that, The device includes a frame, a stationary isolation blade module (200), a grounding contact module (300), and an isolation rotation module as described in any one of claims 1-9. The stationary isolation blade module (200), the grounding contact module (300), and the isolation rotation module are all disposed on the frame, and the isolation rotation module is rotatably connected to the frame.