Self-locking leading-out terminal with split structure

Abstract

The utility model discloses a self-locking leading-out terminal with a split structure, which is arranged on an end cover of a capacitor in a penetrating manner and comprises a terminal body, an insulating seat and a self-locking assembly, the self-locking assembly is divided into two fasteners with the same structure along a locking surface, the fasteners are symmetrical by rotating by 180 degrees by taking the central axis of the inner hole as a symmetrical central line, the locking surface of each fastener comprises a first locking part and a second locking part, the first locking parts of the fasteners are matched to realize the locking of the self-locking assembly and the terminal post in the horizontal direction, and the second locking parts of the fasteners are matched with the first locking parts of the fasteners to realize the locking of the self-locking assembly and the terminal post in the horizontal direction. And the second locking part of the fastener is matched with the first clamping groove to realize locking of the self-locking assembly and the terminal column in the vertical direction. According to the utility model, the self-locking assembly with the rotationally symmetrical fasteners is matched with the terminal columns, so that the leading-out terminal is tightly and effectively assembled and fixed, the assembling process is convenient and fast, the operations of vibration, movement and the like which are easy to damage the terminal in the installation process can be avoided for a large-size capacitor, and the terminal adopting the self-locking assembly is convenient to assemble and fix when being used. And the use requirements of high-temperature and high-humidity occasions can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of film capacitors, in particular to a self-locking lead-out terminal with a split structure. Background Art

[0002] Film capacitors refer to larger capacitors used in power electronics applications. The size of the finished capacitor in one direction is usually greater than 0.5 meters. This type of capacitor currently mainly uses polypropylene film as the dielectric, with an operating voltage of less than 5,000 volts and a current of several hundred amperes to one thousand amperes. The core group consists of multiple cores in multiple strings, multiple parallels, or multiple strings and parallels. Based on the potential demand for long-term safe use of film capacitors, the dry type is sealed by pouring two-component polyurethane or epoxy resin and then curing. The liquid type is isolated from the air with insulating oil, and the outermost shell is made of thin-walled metal plate. Therefore, the insulation, sealing, and convenient installation and disassembly of the lead terminals need to be considered. However, the terminals currently on the market have certain defects, and the product will basically be damaged after disassembly, resulting in failure to pass the high temperature and high humidity sealing test of 85℃+85%RH. Utility Model Content

[0003] The purpose of the utility model is to provide a self-locking lead-out terminal with a split structure, so as to solve a series of problems such as the inconvenience of installation and manufacturing caused by the complex structure of the lead-out terminal of the existing large-size film capacitor, the difficulty in disassembly which may cause the product to be damaged and scrapped, and the insufficient sealing performance under high temperature and high humidity, so as to overcome the shortcomings of the existing technology.

[0004] The utility model provides a self-locking lead-out terminal with a split structure through the following technical solutions, which is installed on the end cover of the capacitor. The lead-out terminal includes a terminal body, an insulating seat and a self-locking component;

[0005] The terminal body comprises an integral terminal seat and a terminal column, wherein the terminal column is located above the terminal seat and a first clamping groove is provided on the terminal column along the circumference;

[0006] An insulating seat is sleeved on the terminal body and located between the terminal body and the end cover;

[0007] The self-locking component has an inner hole that matches the outer edge of the terminal column. The self-locking component is divided into two fasteners with the same structure along the locking surface. The fasteners are rotated 180° symmetrically with the central axis of the inner hole as the symmetry center line. The locking surface of each fastener includes a first locking part and a second locking part. The first locking part of each fastener cooperates to realize horizontal locking of the self-locking component and the terminal column, and the second locking part of each fastener cooperates with the first card slot to realize vertical locking of the self-locking component and the terminal column.

[0008] Furthermore, the first locking portion of the locking surface comprises a tenon and a mortise and tenon that cooperate with each other.

[0009] Furthermore, the tenon includes a first vertical section, an outer arc section and a first inclined section, the mortise and tenon includes a second vertical section, an inner arc section and a second inclined section, and the central angle n of the outer arc section and the inner arc section is 10-30°.

[0010] Furthermore, the second locking portion is a block protruding inwardly from the side wall of the inner hole.

[0011] Furthermore, the radius of the outer arc segment is r1, the radial length from the outer edge of the block to the axis of the inner hole is r2, the straight-line distance between the intersection of the inner arc segment and the second inclined segment and the vertex of the opposite block is L, r1+r2-L=0.2-0.3mm.

[0012] Furthermore, an annular groove is provided on the circumference of the outer edge of the insulating seat, and a first sealing ring is provided in the annular groove.

[0013] Furthermore, a second slot is provided circumferentially at the lower portion of the terminal column, and a second sealing ring is provided in the second slot.

[0014] Furthermore, each of the fasteners is also provided with an unlocking assistance hole.

[0015] The utility model has the following beneficial effects: by cooperating with the terminal column through the self-locking component having the rotationally symmetrical fastener, the lead-out terminal is tightly and effectively assembled and fixed, the assembly process is convenient and quick, and for large-sized capacitors, operations such as vibration and movement that are easy to damage the terminal during the installation process can be avoided. The terminal using the self-locking component can meet the use requirements of high temperature and high humidity environments during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a three-dimensional schematic diagram of a self-locking lead-out terminal with a split structure described in the utility model.

[0017] Figure 2 This is an exploded schematic diagram of a self-locking lead-out terminal with a split structure described in the utility model.

[0018] Figure 3 This is a vertical front cross-sectional view of a self-locking lead-out terminal with a split structure described in the utility model.

[0019] Figure 4 This is a schematic diagram of a self-locking assembly of a self-locking lead-out terminal with a split structure described in the present invention.

[0020] Figure 5 This is a schematic diagram of the first locking portion of a self-locking lead-out terminal with a split structure described in the present invention.

[0021] in, Figures 1 to 5 The corresponding relationship between the reference numerals and component names is as follows:

[0022] 1 end cover, 2 terminal body, 3 insulating seat, 4 self-locking assembly, 5 terminal seat, 6 terminal column, 7 first card slot, 8 inner hole, 9 fastener, 10 first locking part, 11 second locking part, 12 tenon, 13 mortise and tenon, 14 first vertical section, 15 outer arc section, 16 first inclined section, 17 second vertical section, 18 inner arc section, 19 second inclined section, 20 block, 21 ring groove, 22 first sealing ring, 23 second card slot, 24 second sealing ring, 25 unlocking power-assisting hole. DETAILED DESCRIPTION

[0023] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0024] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0025] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] Refer to the following Figure 1-5 A self-locking lead-out terminal with a split structure according to some embodiments of the present application is described.

[0029] A self-locking lead-out terminal with a split structure is passed through the end cover 1 of the capacitor. The lead-out terminal includes a terminal body 2, an insulating seat 3 and a self-locking component 4; the terminal body 2 includes an integral terminal seat 5 and a terminal column 6. The terminal column 6 is located above the terminal seat 5. A first card groove 7 is provided along the circumference of the terminal column 6, and a second card groove 23 is provided along the circumference of the lower part of the terminal column 6. The terminal body 2 is made of metallic copper and has good conductivity.

[0030] The insulating seat 3 is sleeved on the terminal body 2 and is located between the terminal body 2 and the end cover 1. The insulating seat 3 is made of an electrically insulating material such as PBT or PPS, which can ensure the necessary insulation between the terminal body 2 and the end cover 1.

[0031] The self-locking component 4 has an inner hole 8 that cooperates with the outer edge of the terminal column 6. The self-locking component 8 is divided into two fasteners 9 with the same structure along the locking surface. Each fastener 9 is rotated 180° symmetrically with the central axis of the inner hole 8 as the center line of symmetry. The locking surface of each fastener 9 includes a first locking part 10 and a second locking part 11. The first locking part 10 has a tenon 12 and a mortise 13 that cooperate with each other. The tenon 12 includes a first vertical section 14, an outer arc section 15 and a first inclined section 16. The mortise 13 includes a second vertical section 17, an inner arc section 18 and a second inclined section 19; and the second locking part 11 is a block 20 protruding inward from the side wall of the inner hole 8.

[0032] During installation, place the first sealing ring 22 in the circumferential annular groove 21 on the outer edge of the insulating seat 3, and place the second sealing ring 24 in the second card groove 23 of the terminal column 6. Put the insulating seat 3 on the terminal column 6, and pass through the terminal mounting hole from the bottom of the end cover 1. Align the two fasteners 9 with the terminal column 6 and push them toward each other from both sides, where the card block 20 is inserted into the first card groove 7 to realize the vertical locking of the self-locking component 4 and the terminal column 6; the tenon 12 and the mortise 13 of the two fasteners 9 engage with each other to realize the horizontal locking of the self-locking component 4 and the terminal column 6, thereby realizing the installation locking of the terminal body 2 on the end cover 1 by the self-locking component 4.

[0033] At the same time, first sealing ring 22 strengthens the seal between the outer edge of insulating base 3 and end cap 1, while second sealing ring 24 strengthens the seal between the inner edge of insulating base 3 and end cap 1, thereby improving the overall sealing performance of insulating base 3 and enhancing its applicability in high-temperature and high-humidity environments. Both first sealing ring 22 and second sealing ring 24 are made of chloroprene rubber, which has excellent corrosion resistance and long service life.

[0034] The tenon 12 includes a first vertical section 14, an outer arc section 15 and a first inclined section 16, and the mortise and tenon 13 includes a second vertical section 17, an inner arc section 18 and a second inclined section 19. The first vertical section 14 and the second vertical section 17 are located on the same plane at the center of the locking surface; the central angle n between the outer arc section 15 and the inner arc section 18 is 10-30°, the radius of the outer arc section 15 is r1, the radial length from the outer edge of the block 20 to the axis of the inner hole 8 is r2, the straight-line distance between the intersection of the inner arc section 18 and the second inclined section 19 and the vertex of the opposite block 20 is L, r 1+r2-L=0.2-0.3mm, the outer arc segment 15 and the inner arc segment 18 have the same central angle, which can make the tenon 12 and the mortise and tenon 13 fit completely after biting, and the radius of the outer arc segment 15, the radial length from the outer edge of the clamping block 20 to the axis of the inner hole 8 is r2, and the straight-line distance between the intersection of the inner arc segment 18 and the second inclined segment 19 and the vertex of the opposite clamping block 20 is L. When the tenon 12 and the mortise and tenon 13 are engaged or disengaged, it is necessary to overcome the resistance caused by a certain deformation, thereby improving the stability of the bite of the tenon 12 and the mortise and tenon 13.

[0035] In order to facilitate unlocking, an unlocking assist hole 25 is provided on each fastener 9. By inserting the corresponding tool into the unlocking assist hole 25 and pulling it, the two fasteners 9 can be separated from each other, and the installation lock of the terminal body 2 on the end cover 1 by the self-locking component 4 is released. The unlocking process is simple and moderate, and will neither destroy the original structure of the self-locking terminal 4 nor cause damage to the terminal body 2 or the end cover 1 due to violent unlocking.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-locking lead-out terminal with a split structure, which is installed on the end cover of the capacitor, characterized in that: The lead-out terminal comprises a terminal body, an insulating seat and a self-locking component; The terminal body comprises an integral terminal seat and a terminal column, wherein the terminal column is located above the terminal seat and a first clamping groove is provided on the terminal column along the circumference; An insulating seat is sleeved on the terminal body and located between the terminal body and the end cover; The self-locking component has an inner hole that matches the outer edge of the terminal column. The self-locking component is divided into two fasteners with the same structure along the locking surface. The fasteners are rotated 180° symmetrically with the central axis of the inner hole as the symmetry center line. The locking surface of each fastener includes a first locking part and a second locking part. The first locking part of each fastener cooperates to realize horizontal locking of the self-locking component and the terminal column, and the second locking part of each fastener cooperates with the first card slot to realize vertical locking of the self-locking component and the terminal column.

2. The self-locking lead-out terminal with a split structure according to claim 1, characterized in that: The first locking portion of the locking surface comprises a tenon and a mortise and tenon that cooperate with each other.

3. The self-locking lead-out terminal with a split structure according to claim 2, characterized in that: The tenon includes a first vertical section, an outer arc section and a first inclined section, and the mortise and tenon includes a second vertical section, an inner arc section and a second inclined section. The central angle n of the outer arc section and the inner arc section is 10-30°.

4. The self-locking lead-out terminal with a split structure according to claim 3, characterized in that: The second locking portion is a block protruding inwardly from the side wall of the inner hole.

5. The self-locking lead-out terminal with a split structure according to claim 4, characterized in that: The radius of the outer arc segment is r1, the radial length from the outer edge of the block to the axis of the inner hole is r2, the straight-line distance between the intersection of the inner arc segment and the second inclined segment and the vertex of the opposite block is L, r1+r2-L=0.2-0.3mm.

6. The self-locking lead-out terminal with a split structure according to claim 1, characterized in that: An annular groove is provided on the outer circumference of the insulating seat, and a first sealing ring is provided in the annular groove.

7. The self-locking lead-out terminal with a split structure according to claim 1, characterized in that: A second clamping groove is circumferentially provided at the lower portion of the terminal column, and a second sealing ring is provided in the second clamping groove.

8. A self-locking lead-out terminal with a split structure according to any one of claims 1 to 7, characterized in that: Each of the fasteners is also provided with an unlocking power-assisting hole.

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