A contact finger

Abstract

The utility model discloses a contact finger, including the cooperation of contact assembly and contact seat subassembly, and the cooperation of contact assembly and contact seat subassembly is equipped with the protection component, the protection component and contact assembly, contact seat subassembly between through detachable connecting structure realizes the fixed, and the cooperation channel of contact seat subassembly is equipped with the contact finger subassembly for the conduction contact, the contact finger still includes the particle filter subassembly, and the particle filter subassembly sets up in the inner chamber of contact assembly and the inner chamber of contact seat subassembly respectively, the utility model has the beneficial effects that: this technical scheme through the protection of shield, elastic contact finger, baffle ring and earless baffle ring, particle filter subassembly structure, realize the connection between different GIL unit conductors, have the advantages such as strong through-flow capacity, big axial stroke, big angle deflection, self-aligning, uniform electric field distribution etc, and can limit the particle of the friction between contact and contact finger in the protection component, improve the operation reliability of GIL.

Description

Technical Field

[0001] This utility model relates to the field of high voltage electrical technology, and in particular to a touch finger. Background Technology

[0002] Currently, traditional contact fingers typically consist of a contact assembly, a contact base assembly, and a spring contact finger, achieving current transmission through the elastic contact between the spring contact finger and the conductive end. To ensure the contact stability of the spring contact finger, a centering device is required to ensure that the elastic force around the spring contact finger remains consistent. Furthermore, the lack of protective devices on the outside of the contact and contact base makes it impossible to confine particles generated by friction between the contact base and the contact finger within protective components, posing a potential hazard to the safe operation of the GIL (Gas Insulation Circuit).

[0003] Traditional contact finger mating joints often employ open or simple protective components, which fail to effectively confine particles generated by contact finger friction within these components. This allows particles to diffuse into the gas-insulated contact lens (GIL), potentially leading to partial discharge or short circuit faults. While some products incorporate protective components, the open connection between these components and the contact base fails to effectively contain the generated particles. Centering devices, while ensuring contact stability, increase friction. Frequent insertion and removal can cause wear on the spring contact finger plating (e.g., silver plating peeling off), reducing conductivity and mechanical life. Furthermore, they limit the angular deflection between the contact and contact base, decreasing the GIL's ability to absorb ground settlement. In addition, traditional structures lack effective radial compensation mechanisms. When installation errors or equipment vibrations occur, significant eccentric forces are generated between the contact and contact base, further increasing friction and exacerbating wear and the risk of poor contact. During insertion and removal of the contacts, friction between the contact plates and the conductive ends generates metal debris (such as copper alloy or silver-plated particles). Existing particle traps are mostly located externally at the mating points, only able to intercept some external impurities and unable to filter metal debris generated within the conductor's internal cavity during manufacturing. If this debris accumulates in the gaps between the contact plates or on the contact surface, it can obstruct the conductive path and affect current flow. Currently, the filter and protective components of existing contacts are mostly non-removable structures, requiring complete disassembly of the contact assembly for replacement, resulting in low maintenance efficiency and high costs. In some products, the contact plates and mounting slots are integrated, necessitating replacement of the entire assembly if only partially damaged, further increasing operating costs.

[0004] Therefore, it is necessary to develop a finger structure that integrates large angle deflection capability, self-alignment, high-efficiency protection, low-friction guidance, dual particulate filtration, stable contact pressure, and convenient maintenance. By optimizing the fixing and guiding design of protective components, the elastic contact mechanism of the finger assembly, and the layout of the particulate filtration components, the problems of traditional fingers, such as small angle deflection capability, lack of self-alignment function, insufficient protection, severe wear, poor pollution control, and cumbersome maintenance, can be solved, thereby improving the mechanical life, electrical reliability, and environmental adaptability of the finger. Utility Model Content

[0005] The main technical problem solved by this utility model is to provide a touch finger that solves one or more of the problems in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a contact finger, comprising a contact assembly and a contact base assembly that cooperate with each other, wherein the innovation lies in: a protective component is provided at the mating point of the contact assembly and the contact base assembly; a contact finger assembly for conductive contact is provided in the mating channel of the contact base assembly; the protective component is fixed to the contact assembly and the contact base assembly through a detachable connection structure; the contact finger also includes a particle filtering assembly, which is respectively disposed in the inner cavity of the contact assembly and the inner cavity of the contact base assembly.

[0007] In some embodiments, the inner wall of the protective component is coated with a non-drying adhesive, which is used to absorb particles generated by the relative movement and friction between the contacts and fingers.

[0008] In some embodiments, an annular mounting groove is provided on the inner wall of the mating channel end of the contact assembly, the contact finger assembly is embedded in the mounting groove, and the contact end of the contact finger assembly protrudes out of the mounting groove and mates with the conductive end of the contact assembly.

[0009] In some embodiments, there is a first filter unit and a second filter unit. The first filter unit is disposed in the inner cavity of the contact assembly near the conductive end, and the second filter unit is disposed in the inner cavity of the contact base assembly near the finger assembly. The filter media of the first filter unit and the second filter unit are porous adsorption materials.

[0010] In some embodiments, the detachable connection structure includes a guide disposed on the outer wall of the contact assembly and a first slot disposed on the inner wall of the protective component, wherein the guide is fitted into the first slot to achieve circumferential positioning of the protective component and the contact assembly.

[0011] In some embodiments, the detachable connection structure further includes an elastic locking member disposed on the outer wall of the contact assembly, and a second slot disposed on the inner wall of the protective member, the end of the elastic locking member being fitted into the second slot to achieve axial locking between the protective member and the contact assembly.

[0012] In some embodiments, the contact finger assembly includes a plurality of circumferentially arranged contact finger pieces and an elastic metal ring for stringing all the contact finger pieces into an annular contact. The contact finger pieces are made of copper or copper alloy and are silver-plated. The contact finger assembly also includes a retainer that covers the outer side of the annular contact. A spring is provided between the retainer and the contact finger pieces. The spring force causes each contact finger piece to generate an inward positive pressure perpendicular to the contact assembly, ensuring that the contact resistance between each contact finger piece and the contact assembly is within the allowable range. A retaining ring and an earless retaining ring are provided in the annular mounting groove. The retaining ring and the earless retaining ring are used to fix the contact finger assembly in the annular mounting groove. There is a gap between the outer side of the contact finger assembly and the contact base assembly, so the contact finger assembly can move radially within the contact base assembly to achieve self-alignment among the contact assembly, contact finger assembly, and contact base assembly, and reduce internal stress.

[0013] The beneficial effects of this utility model are:

[0014] High reliability: Through protective shield, particulate filter components and flexible finger structure, it achieves angle deflection capability, self-aligning capability and confines the friction particles within the protective components, which can absorb foundation settlement and installation errors, and improve operational reliability.

[0015] Long life design: There is only friction between the contact finger sheet and the contact assembly, and the contact finger assembly has self-aligning capability, which ensures the stability of friction, reduces the phenomenon of increased friction due to installation errors, and improves the mechanical life of the contact finger.

[0016] Easy maintenance: The top pin locking structure supports quick disassembly and assembly, resulting in low replacement costs;

[0017] Excellent conductivity: It has a large number of contact fingers, and the contact resistance between the fingers and the contacts and contacts is small, uniform and stable, with strong current carrying capacity, which meets the conductivity requirements of high voltage electrical equipment (such as GIL, GIS). Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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, wherein:

[0019] Figure 1 This is a cross-sectional structural diagram of a finger according to the present invention. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. 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.

[0021] like Figure 1 As shown, this utility model embodiment includes: a contact finger comprising a contact assembly 100 and a contact base assembly 200, which are electrically connected through a plug-in / plug-out engagement. The specific design, working principle, and advantages of each structure are described in detail below with reference to the technical features of the claims:

[0022] The protective component 300 is a cylindrical cover, integrally molded from aluminum alloy, and possesses the characteristic of a uniform electric field. The inner wall of the cover is provided with adhesive 310 to absorb particles generated by the relative movement and friction between the contacts and contact fingers. The detachable connection structure between the cover and the contact assembly 100 and the contact base assembly 200 specifically includes:

[0023] Guided positioning structure: A guide 501 is embedded on the outer wall of the contact assembly 200, and an annular first slot 502 is opened at the corresponding position on the inner wall of the cover. The guide 501 can be embedded in the slot to achieve circumferential positioning.

[0024] Locking mechanism: The outer wall of the contact assembly 100 is provided with a mounting hole, in which a top pin (with a hemispherical end) and a compression spring are installed. The inner wall of the cover is provided with a second slot 602 (an annular groove that matches the end of the top pin) at the corresponding position.

[0025] When the contact assembly 100 is inserted into the contact base assembly 200, the guide 501 slides along the outer wall of the contact base assembly 200 and is embedded in the first slot 502 to achieve radial guidance; at the same time, the top pin pops out under the action of the compression spring and is locked into the second slot 602 to complete axial locking.

[0026] The guide 501 reduces frictional resistance during insertion and removal, preventing wear on metal parts; the shield covers the mating parts to prevent particles from spreading into the GIL and also provides a uniform electric field.

[0027] The inner wall of the mating channel end of the contact assembly 200 is provided with an annular mounting groove 210, and the contact finger assembly is embedded in the groove. The contact finger assembly includes a plurality of circumferentially arranged contact finger pieces 701 and an elastic metal ring 702 for stringing all the contact finger pieces 701 into an annular contact. The contact finger pieces 701 are made of copper or copper alloy and are silver-plated. The contact finger assembly also includes a retainer 703, which covers the outside of the annular contact. A spring 704 is provided between the retainer 703 and the contact finger pieces. The elastic force of the spring 704 causes each contact finger piece to generate an inward force. The positive pressure perpendicular to the contact assembly 100 ensures that the contact resistance between each contact finger and the contact assembly 100 is within the allowable range; the annular mounting groove 210 is provided with a retaining ring 705 and a retaining ring without ears 706, which are used to fix the contact finger assembly in the annular mounting groove 210. There is a gap between the outer side of the contact finger assembly and the contact base assembly 200, so the contact finger assembly can move radially within the contact base assembly 200 to achieve self-alignment between the contact assembly 100, the contact finger assembly, and the contact base assembly (200) and reduce internal stress.

[0028] When the contact assembly 100 is inserted, its conductive end presses against the contact finger 701, and the spring 704 further compresses and generates a reaction force, so that the contact finger 701 fits tightly against the conductive end; the retainer 703 ensures that the contact finger 701 deforms axially, avoiding lateral displacement of a single contact finger, but allowing all contact fingers to undergo overall radial displacement.

[0029] The copper (or copper alloy) silver-plated material has both high conductivity and wear resistance; the spring 704 provides constant contact pressure to ensure stable current carrying capacity; multiple contact fingers 701 are connected in parallel to distribute the current load and reduce local temperature rise.

[0030] The particulate filter assembly includes a first filter unit 401 (inner cavity of the contact assembly 100) and a second filter unit 402 (inner cavity of the contact base assembly 200), specifically designed as follows:

[0031] First filter unit 401: Located behind the conductive end of contact assembly 100, it is made of porous sponge into an annular filter element and fixed with glue;

[0032] The second filter unit 402 is located at the end of the mating channel of the contact assembly 200. It is a ring-shaped filter element made of porous sponge and fixed with adhesive.

[0033] Metal shavings, environmental dust, and other impurities generated on the inner wall of the conductor during the production process are intercepted by the first filter unit 401 under the action of airflow; tiny particles entering the contact assembly 200 are adsorbed by the second filter unit 402 to prevent impurities from accumulating on the contact surface of the contact finger piece 701.

[0034] The dual filtration design improves the efficiency of impurity filtration and reduces the risk of discharge failure due to poor contact; the sponge is low-cost and easy to replace; the filter element does not affect airflow and avoids component deformation caused by internal pressure buildup.

[0035] The working principle of this technical solution is as follows: when the contact assembly 100 and the contact base assembly 200 are engaged:

[0036] Guiding and locking: The protective cover is guided along the outer wall of the contact assembly 200 by the guide 501, and the top pin is engaged in the second slot 602 to achieve axial locking;

[0037] Conductive contact: The contact assembly 100 is inserted into the contact base assembly 200, and the contact finger 701 is squeezed to compress the spring 704. Under the action of elastic force, the contact finger 701 is tightly attached to the conductive end to form a low current path.

[0038] Particulate filtration: Metal debris generated on the inner wall of the conductor during the production process is intercepted by the first filter unit 401 and the second filter unit 402 in the inner cavity of the plug, ensuring that the contact surface of the finger assembly is clean.

[0039] Protective function: The interior of the protective component is coated with a non-drying adhesive to absorb particles generated by the relative movement and friction between the contacts and fingers. Additionally, the metal nature of the protective component also contributes to creating a uniform electric field.

[0040] The advantages of this technical solution are:

[0041] High reliability: Through protective shield, particulate filter components and flexible finger structure, it achieves angle deflection capability, self-aligning capability and confines the friction particles within the protective components, which can absorb foundation settlement and installation errors, and improve operational reliability.

[0042] Long life design: There is only friction between the contact finger and the contact head, and the contact finger has self-aligning ability, which ensures the stability of friction, reduces the phenomenon of increased friction due to installation errors, and improves the mechanical life of the contact finger.

[0043] Easy maintenance: The top pin locking structure supports quick disassembly and assembly, resulting in low replacement costs;

[0044] Excellent conductivity: It has a large number of contact fingers, and the contact resistance between the fingers and the contacts and contacts is small, uniform and stable, with strong current carrying capacity, which meets the conductivity requirements of high voltage electrical equipment (such as GIL, GIS).

[0045] Details not explicitly stated in this embodiment (such as the specific dimensions of the protective cover, the parameters of the 704 spring, etc.) may be adjusted according to the actual application scenario, but its core structure and working principle fall within the protection scope of this utility model.

[0046] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A contact finger, comprising a contact assembly (100) and a contact base assembly (200) that cooperate with each other, characterized in that: A protective component (300) is provided at the mating point between the contact assembly (100) and the contact base assembly (200); a contact finger assembly for conductive contact is provided in the mating channel of the contact base assembly (200); the protective component (300) is fixed to the contact assembly (100) and the contact base assembly (200) through a detachable connection structure; the contact finger also includes a particle filtering assembly, which is respectively disposed in the inner cavity of the contact assembly (100) and the inner cavity of the contact base assembly (200).

2. A finger according to claim 1, characterized in that: The inner wall of the protective component (300) is coated with an adhesive (310) that never dries, the adhesive (310) being used to adsorb particles generated by the relative movement and friction between the contact and the finger.

3. A finger according to claim 1, characterized in that: The inner wall of the mating channel end of the contact assembly (200) is provided with an annular mounting groove (210), the finger assembly is embedded in the mounting groove, and the contact end of the finger assembly protrudes out of the mounting groove and mates with the conductive end of the contact assembly (100).

4. A finger according to claim 1, characterized in that: The particulate filter assembly includes a first filter unit (401) and a second filter unit (402). The first filter unit (401) is disposed in the inner cavity of the contact assembly (100) near the conductive end, and the second filter unit (402) is disposed in the inner cavity of the contact base assembly (200) near the finger assembly. The filter media of the first filter unit (401) and the second filter unit (402) are porous adsorption materials.

5. A finger according to claim 1, characterized in that: The detachable connection structure includes a guide (501) disposed on the outer wall of the contact assembly (200) and a first slot (502) disposed on the inner wall of the protective component (300). The guide (501) is embedded in the first slot (502) to achieve circumferential positioning of the protective component (300) and the contact assembly (200).

6. A finger according to claim 1, characterized in that: The detachable connection structure also includes an elastic locking member (601) disposed on the outer wall of the contact assembly (100) and a second slot (602) disposed on the inner wall of the protective component (300). The end of the elastic locking member (601) is embedded in the second slot (602) to achieve axial locking between the protective component (300) and the contact assembly (100).

7. A finger according to claim 3, characterized in that: The contact finger assembly includes a plurality of circumferentially arranged contact finger pieces (701) and an elastic metal ring (702) for stringing all the contact finger pieces (701) into an annular contact. The contact finger pieces (701) are made of copper or copper alloy and are silver-plated. The contact finger assembly also includes a retainer (703) that covers the outside of the annular contact. A spring (704) is provided between the retainer (703) and the contact finger pieces. The elastic force of the spring (704) will cause each contact finger piece to generate an inward positive pressure perpendicular to the contact assembly (100), ensuring that each... The contact resistance between the contact finger and the contact assembly (100) is within the allowable range; the annular mounting groove (210) is provided with a retaining ring (705) and a retaining ring without ear (706), which are used to fix the contact finger assembly in the annular mounting groove (210). There is a gap between the outer side of the contact finger assembly and the contact base assembly (200), so the contact finger assembly can move radially in the contact base assembly (200) to achieve self-alignment between the contact assembly (100), the contact finger assembly, and the contact base assembly (200) and reduce internal stress.

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