Mounting plate for Busbar three-phase alternating current contactor

Abstract

A mounting plate for a Busbar three-phase alternating current contactor comprises a plate body, a large circular hole, an external insulated gate sheet, a rectangular plate, a rectangular cavity, an internal insulated gate sheet, a through hole A and a through hole B, a large circular hole is drilled in the plate body; two groups of external insulated gate sheets respectively extend from the middle parts of the two sides of the plate body, and each group of external insulated gate sheets are symmetrically arranged; two rectangular plates are arranged on the two sides of the back face of the plate body respectively, and a rectangular cavity is formed between the two rectangular plates. The two rectangular plates are provided with internal insulated gate sheets parallel to the external insulated gate sheets; four through holes A are drilled in four sides of the large circular hole of the plate body; and six groups of through holes B are drilled in the plate body, each group comprises three through holes B, and the through holes B are arranged in a triangular shape. The transformer has the requirements of installation connection, insulation, strength, movement clearance, fire prevention and the like, a plurality of position through holes are designed to be used for connecting the confluence piece and the shell, the end face supporting iron core is designed, the threaded bushing installation hole is designed to be used for connecting the cover, and the insulation baffle and the rectangular cavity are used for product insulation.

Description

Technical Field

[0001] This invention relates to a mounting plate for a Busbar three-phase AC contactor, belonging to the field of AC contactor technology. Background Technology

[0002] Busbar three-phase AC contactor, such as Figure 1 The main components include the electromagnetic part, the main / auxiliary contact part, and the outer casing. The electromagnetic part includes the housing, magnetic poles, coil, iron core, and bushing. The main contact part includes the main contacts, busbars, contact springs, and support frame. The working principle is that when the electromagnetic part of the contactor is energized, it generates electromagnetic force to drive the iron core and contacts to move. Therefore, a gap (called "magnetic gap") needs to be designed for the movement of the iron core and contacts and the spare stroke of the contacts. The magnetic gap is the distance between the iron core and the magnetic poles. To drive the movement of the contacts, a support frame and a push rod need to be designed to connect to the iron core. At the same time, since the support frame of the three-phase AC contactor needs to connect the three-phase contacts and its length is much greater than that of the iron core, it cannot move directly inside the housing. Therefore, the movement gap of the support frame needs to be designed on the "mounting plate" connecting the coil and the contacts. Summary of the Invention

[0003] The present invention aims to solve the problem of achieving a movement clearance for the support frame, and to support and connect the electromagnetic system and contact parts of the Busbar three-phase AC contactor mounting plate structure. At the same time, it solves multiple technical problems such as insulation, strength, clearance, installation connection, temperature resistance, and fire resistance according to product requirements.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A mounting plate for a Busbar three-phase AC contactor includes a plate body, a large circular hole, external insulating grids, rectangular plates, a rectangular cavity, internal insulating grids, through holes A and B. The plate body has a large circular hole. Two sets of external insulating grids extend from the middle of each side of the plate body, each set symmetrically arranged. Two rectangular plates are located on each side of the back of the plate body, forming a rectangular cavity between them. Internal insulating grids, parallel to the external insulating grids, are located on the two rectangular plates. Four through holes A are drilled on four sides of the large circular hole in the plate body. The plate body has six sets of through holes B, with three holes in each set, arranged in a triangular pattern.

[0005] The beneficial effects of adopting the above technical solution are: This invention relates to a novel "mounting plate" designed for Busbar three-phase AC contactors, used to connect the housing, busbar segments, core, support frame, etc. This part meets the requirements for installation connection, insulation, strength, movement clearance, fire resistance, etc. It is designed with multiple through holes for connecting the busbar segments and the housing, an end face to support the core, threaded bushing mounting holes for connecting the cover, and an insulating baffle and rectangular cavity for product insulation. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 The installation plate, flange plate and shell connection diagram of the conventional contactor.

[0007] In the figure: 11 - shell, 12 - flange plate, 13 - installation plate.

[0008] Figure 2 The installation plate front structure diagram of the present application.

[0009] Figure 3 The installation plate back structure diagram of the present application.

[0010] In the figure: 1 - plate body, 2 - large round hole, 3 - external insulation grid piece, 4 - rectangular plate, 5 - rectangular cavity, 6 - internal insulation grid piece, 7 - through hole A, 8 - through hole B.

[0011] Figure 4 The installation plate assembly diagram of the present application.

[0012] In the figure: 11 - shell, 13 - installation plate, 41 - screw, 42 - iron core, 43 - support frame assembly, 44 - brim gap, 45 - support frame movement gap.

[0013] Figure 5 The support frame movement gap diagram of the conventional contactor.

[0014] In the figure: 51 - coil, 45 - support frame movement gap. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings, and it should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0016] 1. New installation and connection design: Generally, the connection between the coil and the contact of the three-phase alternating current contactor is usually converted and connected through the flange plate 12, Figure 1 as shown; and according to the appearance requirements of the Busbar three-phase alternating current contactor product and the above requirements, the present application uses a new "installation plate" structure as shown in Figure 2 , Figure 3 The screw is directly connected to the coil shell through the installation plate, and a rectangular cavity 5 is designed at the bottom of the installation plate for manufacturing the support frame movement gap. The through hole B8 arranged in a triangular shape on the "installation plate" of the Busbar three-phase alternating current contactor is used for screwing the three-phase busbar (6 places in total) installation position and the fastening connection structure as shown in Figure 2 , Figure 3As shown, to connect the main contacts, the end face of the core brim is designed, and screws 41 are used to connect the core 42 and the support frame assembly 43, forming a brim gap ("the distance between the core and the housing after the core is engaged"), as shown. Figure 4 As shown.

[0017] 2. Insulation Design 1) The main contacts are insulated from the coil: The mounting plate is made of FX-501 phenolic plastic, which has a resistivity of 1×10¹³ megohms and excellent insulation properties, ensuring insulation between the coil and the busbar. The FX-501 also forms a support frame assembly, which connects to the core via the mounting plate's support end face, further insulating coil 51 from the busbar. Figure 4 As shown.

[0018] 2) Busbar phase-to-phase insulation The "mounting plate" design features baffle insulation for all three phases. Through its cooperation with the cover, each phase is isolated into an independent chamber. Simultaneously, additional grids are added between the external busbars to completely block insulation. Specifically, as follows... Figure 3 As shown.

[0019] 3) Insulation between phases Insulation between phases is mainly located near the contacts of the two busbars, primarily relying on the rectangular cavity 5 at the bottom of the mounting plate for insulation. This cavity is relatively deep, preventing carbon buildup and ensuring proper conduction, thus achieving in-phase insulation. Figure 3 As shown.

[0020] 3. Structural strength design: The mounting plate is made of FX-501 phenolic plastic with a structural strength of (170 - 294) MPa. According to structural simulation analysis, the maximum stress at this location is 38 MPa. The strength of the phenolic plastic is 1.5 times greater than the stress requirement, and the mounting plate meets the strength requirements.

[0021] 4. Novel motion gap design: Typically, the clearance of the support frame for a three-phase AC contactor is designed to be located at the top of the mounting plate (near the coil end), such as... Figure 5 As shown, the "mounting plate" of the Busbar three-phase AC contactor designed in this invention is located near the contact point, as... Figure 3 As shown; based on the contact movement requirements, the core cap clearance and support frame movement clearance were designed for this Busbar three-phase AC contactor, as follows: Figure 4 As shown, the core cap gap 44 is used for core movement. The gap is designed to be 0.3mm to prevent the core from not fully engaging. A support frame movement gap is designed so that the support frame assembly moves upward with the core to achieve contact connection. The support frame assembly movement gap 45 is designed to be 3.2mm in size, which also aims to prevent the core from fully engaging with the magnetic pole.

[0022] 5. Temperature-resistant, fireproof design The product design requirement is to work in a high-temperature 90℃ environment. According to the simulation, the temperature of the part at this position is about 150℃. In order to meet this requirement, the original material of the mounting plate should be FX-501 phenolic plastic with higher temperature resistance. This material can reach a temperature resistance of 270℃.

[0023] As shown in Figures 1 to 5 A new type of "mounting plate" is designed for the Busbar three-phase AC contactor to connect the shell 11, the bus bar, the iron core 42, the support frame assembly 43, etc. This part meets the requirements of installation connection, insulation, strength, movement gap, fireproofing, etc. Multiple position through holes are designed to connect the bus bar and the shell 11, the end face supports the iron core 42, the threaded bushing mounting hole is designed to connect the cover, and the insulating grid and the rectangular cavity 5 are designed for product insulation.

Claims

1. A mounting plate for use on a Busbar three-phase AC contactor, characterized in that: It includes a plate (1), a large circular hole (2), an external insulating grid (3), a rectangular plate (4), a rectangular cavity (5), an internal insulating grid (6), a through hole A (7), and a through hole B (8); the plate (1) has a large circular hole (2); two sets of external insulating grids (3) extend from the middle of both sides of the plate (1), and each set of external insulating grids (3) is symmetrically arranged; two rectangular plates (4) are respectively provided on both sides of the back of the plate (1), and a rectangular cavity (5) is formed between the two rectangular plates (4); internal insulating grids (6) parallel to the external insulating grids (3) are provided on the two rectangular plates (4); four through holes A (7) are drilled on four sides of the large circular hole (2) of the plate (1); the plate (1) has through holes B (8), and there are a total of six sets of holes B (8), each set consisting of three holes, arranged in a triangle.

2. The mounting plate for a Busbar three-phase AC contactor according to claim 1, characterized in that: The mounting plate is made of FX-501 phenolic plastic.

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