Contact unit and isolating switch

Abstract

The utility model discloses a contact unit and an isolation switch. The contact unit comprises a housing, a contact assembly and an arc extinguishing assembly. In the contact assembly, a moving contact is composed of a double-contact cutter, and a silver-plated contact part of a static contact is clamped through a contact gap, so that a stable conductive path is formed; the arc extinguishing assembly adopts three layers of arc extinguishing grid sheet groups, the second grid sheet group is arranged in a stepped arc shape with gradually increased horizontal offset, and the arc is efficiently segmented and cooled in combination with the V-shaped bending design with gradually increased inclination angle. The top of the arc extinguishing assembly is provided with a magnetic arc striking block, an arc striking channel with opposite heteropoles is formed through adjustment of a sliding groove, and the arc is accurately guided to enter the arc extinguishing chamber. Modularized connecting holes are formed in the side wall of the shell, so that quick assembly of the multi-pole unit is supported; the heat dissipation fins are arranged in the shell, so that the heat dissipation efficiency is improved. The isolation switch is linked with the contact unit through the operation unit, 90-degree rotation switching on and switching off of the moving contact are achieved, electric arcs are subjected to multiple segmentation by the grid pieces and forced stretching by the magnetic field during switching off, and non-residual arc extinguishing is achieved.

Description

Technical Field

[0001] This utility model relates to the field of disconnecting switch technology, specifically to a contact unit and a disconnecting switch. Background Technology

[0002] In existing disconnector switch technologies, the arc handling of contact units often faces the following problems: traditional arc-extinguishing grids are mostly arranged with uniform spacing, resulting in limited arc-splitting efficiency and a tendency for arc residue or reignition; arc-ignition devices are mostly fixed magnetic blocks, which cannot adjust the arc-ignition channel width according to the actual arc intensity, resulting in poor adaptability; the conductive contact stability of the contact assembly is insufficient, and long-term use is prone to increased contact resistance due to oxidation or wear; in addition, the existing arc-extinguishing chamber has a simple heat dissipation structure, which easily accumulates heat under high load conditions, affecting arc-extinguishing performance and equipment lifespan.

[0003] Meanwhile, the assembly of multi-pole contact units often relies on complex wiring and lacks modular design, increasing installation and maintenance costs. To address these issues, there is an urgent need for a contact unit and disconnector solution that features efficient arc extinguishing, flexible adjustment, stable conductivity, and rapid heat dissipation. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the aforementioned problems, this utility model proposes a contact unit and a disconnecting switch, aiming to solve the problems in the prior art where the arc-splitting efficiency of the arc-extinguishing grid is limited, easily leading to arc residue or reignition; and where the arc-ignition device is mostly a fixed magnetic block, which cannot adjust the arc-ignition channel width according to the actual arc intensity, resulting in poor adaptability.

[0006] (II) Technical Solution

[0007] This utility model provides a contact unit, the contact unit comprising:

[0008] case;

[0009] A contact assembly is disposed within the housing and includes a moving contact and a stationary contact. The moving contact is rotatable within the housing, and the stationary contacts are respectively disposed on both sides of the moving contact, with one end of the stationary contact extending to the outside of the housing.

[0010] An arc-extinguishing assembly is disposed within the housing. The arc-extinguishing assembly is located on the rotation path of the moving contact, and when the moving contact makes contact with the stationary contact, the moving contact is located at the arc-extinguishing assembly.

[0011] The arc extinguishing assembly includes multiple arc extinguishing grids with progressively increasing tilt angles, and the arc extinguishing grids are arranged in an arc shape. At least two magnetic arc-inducing blocks are also provided at one end of the arc extinguishing assembly. The two magnetic arc-inducing blocks are arranged opposite each other and adjacent magnetic poles are opposite to form an arc-inducing channel, which is used to introduce the electric arc generated when the moving contact and the stationary contact come into contact into the arc extinguishing assembly.

[0012] In this invention, the arc-extinguishing grid includes a first grid group, a second grid group, and a third grid group. The second grid group is disposed between the first grid group and the third grid group. The arc-extinguishing grids in the first grid group and the third grid group are located at the same vertical position. The horizontal offset between the arc-extinguishing grids in the second grid group increases progressively to enhance the arc-extinguishing effect of the arc-extinguishing grid.

[0013] In this invention, the housing includes a top wall and a side wall. The closer the arc-extinguishing grid plates of the second grid plate group are to the top wall, the greater the horizontal offset between two adjacent arc-extinguishing grid plates.

[0014] The magnetic arc-inducing block is positioned close to the top wall.

[0015] In this utility model, the side of the housing is provided with a connecting hole for fitting adjacent contact units with the connector;

[0016] The stationary contact is provided on one end of the housing and has a contact portion that cooperates with the moving contact. The moving contact is composed of at least two contact blades, and a contact gap is formed between the two contact blades. The moving contact forms a conductive connection with the stationary contact through the contact gap and by clamping the contact portion.

[0017] In this utility model, the arc extinguishing assembly further includes a housing disposed on the left and right sides of the arc extinguishing grid plate, and one end of the housing is provided with a cavity for accommodating the magnetic arc-inducing block;

[0018] The inner wall of the outer casing is provided with a groove for accommodating the arc-extinguishing grid plate.

[0019] In this invention, the cavity is provided with a sliding groove, and the magnetic arc-inducing block includes a connecting seat that can slide in the sliding groove and a permanent magnet block. The permanent magnet block is disposed at one end of the connecting seat, and the two sides of the connecting seat are provided with protrusions that cooperate with the sliding groove.

[0020] In this invention, one end of the cavity is provided with an opening and the cavity is a semi-enclosed structure, with the opening located on the side away from the arc-extinguishing grid.

[0021] In this invention, the number of arc-extinguishing components is the same as the number of contact components.

[0022] Another disconnecting switch of this utility model includes:

[0023] The operating unit has a handle on top and a transmission component and a rotating connector inside. The rotating connector can be rotated by operating the handle.

[0024] At least one contact unit as described in the above technical solution is disposed on one side of the operating unit through the rotating connector.

[0025] (III) Beneficial Effects

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] (1) In this utility model, the electric arc is divided into multiple short arcs by the stepped offset design of the first, second and third grid groups, combined with the arc arrangement with the gradually increasing tilt angle, and the electric arc is guided by the magnetic field to accelerate along the inclined path, which significantly improves the cooling efficiency of the electric arc.

[0028] (2) In this utility model, the magnetic arc-initiating block achieves position sliding through the sliding groove and the connecting seat. The distance between adjacent magnetic poles can be adjusted according to the actual working conditions to optimize the arc-initiating channel width and ensure that the electric arc is accurately introduced into the arc-extinguishing chamber. The moving contact adopts a double contact knife clamping structure, and the contact gap and the contact part of the stationary contact form a double-point conduction. Combined with the silver-plated surface, it effectively reduces the contact resistance and improves the wear resistance. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the overall structure of the contact unit;

[0031] Figure 2 This is a schematic diagram of the exploded structure of the arc-extinguishing assembly;

[0032] Figure 3 A schematic diagram of the connection structure between the outer shell and the magnetic arc-starting block;

[0033] Figure 4 This is a schematic diagram of the connection structure between the arc extinguishing assembly and the stationary contact;

[0034] Figure 5 This is a side view of the arc-extinguishing grid structure.

[0035] Figure 6This is a schematic diagram of the endpoint offset curve of the arc-extinguishing grid.

[0036] Figure 7 This is a schematic diagram of the overall structure of the disconnector switch;

[0037] Figure 8 Schematic diagram of the internal structure of the disconnector switch Figure 1 ;

[0038] Figure 9 Schematic diagram of the internal structure of the disconnector switch Figure 2 .

[0039] 10. Housing; 11. Connecting hole; 12. Top wall; 13. Side wall; 20. Contact assembly; 21. Moving contact; 211. Contact blade; 212. Contact gap; 22. Stationary contact; 221. Contact part; 30. Arc extinguishing assembly; 31. Arc extinguishing grid; 311. First grid group; 312. Second grid group; 313. Third grid group; 32. Outer shell; 321. Cavity; 322. Slide groove; 323. Groove; 33. Magnetic arc ignition block; 331. Connecting seat; 332. Protrusion; 333. Permanent magnet; 334. Arc ignition channel; 40. Operating unit; 41. Handle; 42. Transmission assembly; 43. Rotating connector. Detailed Implementation

[0040] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0041] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising,” “including,” or “having” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “connected” are not limited to the physical or mechanical connection or connection shown in the drawings, but may include equivalent connections or connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” “right,” “horizontal,” and “vertical” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0042] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] Example 1

[0044] like Figure 1-9 As shown, the overall structure of the contact unit consists of a housing 10, a contact assembly 20, and an arc-extinguishing assembly 30. The housing 10 is injection molded from high-strength insulating material and has an internal cavity 321 for accommodating the contact assembly 20 and the arc-extinguishing assembly 30.

[0045] The housing 10 has a rectangular structure, including upper and lower top walls 12 and two side walls 13 perpendicular to the top walls. A circular connection hole 11 is provided in the center of each side wall 13. Specifically, the number of connection holes 11 depends on whether the contact unit is a middle unit or a side unit, i.e., whether another contact unit is required on either side of the contact unit in the disconnecting switch. If the contact unit is a middle unit, connection holes 11 should be symmetrically provided on both the left and right sides of the housing 10 to facilitate the series connection of the entire contact unit via the rotating connector 43. If the contact unit is a side unit, only the side adjacent to the other contact unit needs to have a connection hole 11. Of course, to maintain consistency and reduce production costs, the contact unit as a side unit can also have symmetrical connection holes 11 on both sides of the housing 10.

[0046] The connecting hole 11 is embedded with a rotating connector 43, which is used to modularly connect with other contact units by assembly or snap-fit, so as to achieve rapid assembly of multi-pole contact units. The contact assembly 20 includes two parts: a moving contact 21 and a stationary contact 22.

[0047] The moving contact 21 consists of two copper alloy contact blades 211, which are parallel and spaced apart to form a contact gap 212. The ends of the contact blades 211 are fixed to a rotating shaft by riveting. The two ends of the rotating shaft are embedded in the side wall 13 of the housing 10 through bearings, allowing the moving contact 21 to rotate 0° to 90° around the axis within the housing 10. The stationary contact 22 adopts an L-shaped copper busbar structure. One end extends to the outside of the housing 10 through a crimp terminal as a wiring terminal, and the other end is bent upward within the housing 10 to form a contact portion 221. The surface of the contact portion 221 is silver-plated to reduce contact resistance. The two stationary contacts 22 are symmetrically arranged on both sides of the moving contact 21. When the moving contact 21 rotates to the closed position, the two contact blades 211 clamp the contact portion 221 of the stationary contact 22 through the contact gap 212, forming a double-point contact conductive path to ensure the stability of the current path.

[0048] The arc-extinguishing assembly 30 is located directly below the rotation path of the moving contact 21 and consists of three parts: an arc-extinguishing grid group 31, a housing 32, and a magnetic arc-inducing block 33. The arc-extinguishing grid group 31 is divided into a first grid group 311, a second grid group 312, and a third grid group 313. In this embodiment, the number of first grid groups 311 is 3, the number of second grid groups 312 is 8, and the number of third grid groups 313 is 1, and the grid surfaces are coated with a high-temperature resistant ceramic coating. The grids of the first grid group 311 and the third grid group 313 are arranged vertically, and the lower ends of all grids are aligned and welded to the groove 323 at the bottom of the housing 32, forming a reference alignment structure. It should be noted that the vertical arrangement here means that the front-to-back offset of all the arc-extinguishing grids 31 in the first grid group 311 is almost zero, that is, all the arc-extinguishing grids 31 in the first grid group 311 are on the same straight line. The third grid plate group 313 corresponds to the vertical position of the last arc-extinguishing grid plate 31 of the second grid plate group 312. However, when the whole group is installed inside the housing 32, it is arranged in an arc shape, but they are all arranged away from the side wall 13 of the housing 10.

[0049] The second grid group 312 is located between the first and third grid groups 313. Its grids employ a stepped offset design: from bottom to top, the horizontal offset of adjacent grids increases in increments of 0.5mm. The bottommost grid is aligned with the first grid group 311, and the topmost grid has a horizontal offset of 4.5mm, forming a fan-shaped, arc-shaped arrangement. The grid tilt angle gradually increases from 5° at the bottom to 25° at the top, with the tilt angle variation referring to... Figure 5-6 As shown, this is mainly reflected in the change of the tilt angle of the front end, that is, the whole rotates clockwise around the front end as the center. Figure 5 (in the direction of the arc). This design causes the arc to be divided into multiple short arcs after entering the arc-extinguishing chamber. At the same time, as the spacing between the grid plates gradually decreases, the arc accelerates along the inclined surface under the action of the magnetic field, and the heat is quickly dissipated to the outer shell 32 through the surface of the grid plates.

[0050] The outer shell 32 adopts a split structure, with the left and right sides locked by snap-fit ​​fasteners. The inner wall 13 has a dovetail groove, and the arc-extinguishing grid plate 31 is fixed in the groove by laser welding. The top of the outer shell 32 has a semi-enclosed cavity 321, and the inner side of the cavity 321 has two parallel sliding grooves 322, with a T-shaped cross-section. The magnetic arc-initiating block 33 consists of a connecting seat 331 and a permanent magnet block 333. The connecting seat 331 has protrusions 332 on both sides that match the sliding grooves 322. The permanent magnet block 333 is a neodymium iron boron magnet, which is bonded to the front end of the connecting seat 331 with epoxy resin. The two magnetic arc-initiating blocks 33 are symmetrically installed on both sides of the cavity 321. By sliding adjustment, the adjacent magnetic poles are made to face each other with opposite poles (NS), forming an arc-initiating channel 334. When the moving contact 21 separates from the stationary contact 22, the generated arc is forcibly stretched to the arc-initiating channel 334 under the action of the magnetic field, and then segmented and cooled along the arc-shaped path of the arc-extinguishing grid plate 31.

[0051] This utility model also discloses a disconnecting switch. In this embodiment, the disconnecting switch includes an operating unit and four contact units, corresponding to the three electrodes of the three-phase circuit and the ground phase, respectively. The operating unit 40 is linked to the contact units through a rotating connector 43. The rotating connector 43 is a hexagonal steel shaft, one end of which meshes with the worm gear transmission assembly 42 of the operating unit 40, and the other end passes through the side wall 13 of the housing 10 and is keyed to the rotating shaft of the moving contact 21. The operating handle 41 is wrapped with anti-slip rubber. When rotated 90° clockwise, the transmission assembly 42 drives the moving contact 21 to rotate from the open position to the closed position. At this time, the arc extinguishing assembly 30 completely covers the movement trajectory of the moving contact 21. During the disconnection process, the moving contact 21 quickly disengages from the contact portion 221 of the stationary contact 22. The arc is pulled into the arc extinguishing chamber under the action of the magnetic arc ignition block 33, and is then divided into short arcs in series by multi-stage grid plates. The arc voltage increases significantly until it can no longer be maintained and is extinguished.

[0052] The three-layer grid design of the arc extinguishing component 30 further increases the tortuosity of the arc path. Combined with the stepped offset structure, the arc energy is rapidly dissipated under multiple divisions and cooling effects, ultimately achieving arc extinguishing without residue.

[0053] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A contact unit, characterized in that, The contact unit includes: case; A contact assembly is disposed within the housing and includes a moving contact and a stationary contact. The moving contact is rotatable within the housing, and the stationary contacts are respectively disposed on both sides of the moving contact, with one end of the stationary contact extending to the outside of the housing. An arc-extinguishing assembly is disposed within the housing. The arc-extinguishing assembly is located on the rotation path of the moving contact, and when the moving contact makes contact with the stationary contact, the moving contact is located at the arc-extinguishing assembly. The arc extinguishing assembly includes multiple arc extinguishing grids with progressively increasing tilt angles, and the arc extinguishing grids are arranged in an arc shape. At least two magnetic arc-inducing blocks are also provided at one end of the arc extinguishing assembly. The two magnetic arc-inducing blocks are arranged opposite each other and adjacent magnetic poles are opposite to form an arc-inducing channel, which is used to introduce the electric arc generated when the moving contact and the stationary contact come into contact into the arc extinguishing assembly.

2. The contact unit according to claim 1, characterized in that, The arc-extinguishing grid includes a first grid group, a second grid group, and a third grid group. The second grid group is disposed between the first grid group and the third grid group. The arc-extinguishing grids in the first grid group and the third grid group are located at the same vertical position. The horizontal offset between the arc-extinguishing grids in the second grid group increases progressively to enhance the arc-extinguishing effect of the arc-extinguishing grid.

3. The contact unit according to claim 2, characterized in that, The housing includes a top wall and a side wall. The closer the arc-extinguishing grid plates of the second grid plate group are to the top wall, the greater the horizontal offset between two adjacent arc-extinguishing grid plates. The magnetic arc-inducing block is positioned close to the top wall.

4. The contact unit according to claim 3, characterized in that, The side of the housing is provided with a connection hole for fitting two adjacent contact units with the connector; The stationary contact is provided on one end of the housing and has a contact portion that cooperates with the moving contact. The moving contact is composed of at least two contact blades, and a contact gap is formed between the two contact blades. The moving contact forms a conductive connection with the stationary contact through the contact gap and by clamping the contact portion.

5. The contact unit according to claim 3 or 4, characterized in that, The arc extinguishing assembly also includes a housing disposed on the left and right sides of the arc extinguishing grid plate, and one end of the housing is provided with a cavity for accommodating the magnetic arc-inducing block; The inner wall of the outer casing is provided with a groove for accommodating the arc-extinguishing grid plate.

6. The contact unit according to claim 5, characterized in that, The cavity is provided with a sliding groove, and the magnetic arc-inducing block includes a connecting seat that can slide in the sliding groove and a permanent magnet block. The permanent magnet block is disposed at one end of the connecting seat, and the two sides of the connecting seat are provided with protrusions that cooperate with the sliding groove.

7. The contact unit according to claim 6, characterized in that, The cavity has an opening at one end and is a semi-enclosed structure, with the opening located on the side away from the arc-extinguishing grid.

8. The contact unit according to claim 7, characterized in that, The number of arc-extinguishing components is the same as the number of contact components.

9. A disconnecting switch, characterized in that, The disconnect switch includes: The operating unit has a handle on top and a transmission component and a rotating connector inside. The rotating connector can be rotated by operating the handle. At least one contact unit according to any one of claims 4-8, the contact unit being disposed on one side of the operating unit through the rotating connector.

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