JP2015038844A - Main circuit terminal cover for circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a main circuit terminal cover for a circuit breaker with high shape retention and reliability for preventing a terminal cover from being removed from a mounting seat of a circuit breaker main body frame by being easily deformed or disassembled, while securing easiness in work for mounting a main circuit terminal to a connection charging part or assembling the main circuit terminal.SOLUTION: In a cylindrical main circuit terminal cover 5 that becomes a resin molding, a connection charging part between a main circuit terminal for each phase pulled out of a main body frame of a circuit breaker and an external connection conductor connected to the main circuit terminal is erected in the main body frame while being surrounded for each phase. The terminal cover 5 is formed in a half-divided structure including half cylindrical bodies 5a and 5b resulting from bisecting the terminal cover 5 in a circumferential direction. Abutment end portions at one side are mutually coupled via a thin hinge part 5c and in an abutment end portion at another side, an engagement type fastener 5f is provided that is formed from an engaging claw 5d and a claw-catching seat 5e which are molded integrally with the half cylindrical bodies 5a and 5b. The half cylindrical bodies 5a and 5b are coupled via the fastener 5f, and the cylindrical main circuit terminal cover 5 is constructed.

Description

  The present invention relates to an assembly structure of a main circuit terminal cover provided in a switch for which a high-pressure vacuum circuit breaker or the like is to be implemented.

  First, taking the vacuum circuit breaker mentioned above as an example, the conventional structure of the main circuit terminal cover attached to the main body frame is shown in FIGS. In the figure, 1 is a main body frame equipped with a vacuum valve (not shown) of a vacuum circuit breaker, 2 is an operation panel arranged on the front surface of the main body frame 1, 2a is an opening / closing operation handle, and 3 is pulled out from the vacuum valve of each phase. Main circuit terminals (bar conductors) on the input and output sides arranged on the upper surface of the body frame 1, 4 is an external connection conductor connected to the main circuit terminal 3, and 5 is a connection between the main circuit terminal 3 and the external connection conductor 4 for each phase. A main circuit terminal cover made of an insulating material that surrounds the connecting charging portion and is fitted on the cover mounting seat 1a of the main body frame 1, and the main circuit terminal cover 5 is arranged on the main body frame. It plays a protective role to prevent foreign objects, small animals, etc. from entering between the main circuit terminals 3 to cause a short circuit accident. In the illustrated example, the external connection conductor 4 is an electric wire, and a crimp terminal 4a is attached to the connection end of the external connection conductor 4, and the crimp terminal 4a is fixedly connected to the main circuit terminal 3 with a fastening bolt 6.

  Here, the main circuit terminal cover 5 is generally a cylindrical body made of a resin molded product such as polypropylene, and the cylindrical terminal cover 5 is connected to a charging portion for connecting the main circuit terminal 3 and the external connection conductor 4. In order to surround and assemble it on the main body frame 1, the terminal cover 5 is first passed through the external connection conductor 4 as a work procedure, and the crimp terminal 4 a of the external connection conductor 4 is bolted to the main circuit terminal 5. After that, the terminal cover 5 is pulled down and is fitted and supported on the cover mounting seat 1 a of the main body frame 1.

  In this case, if the operator inadvertently installs the terminal cover 5 through the external connection conductor 4 and connects the external connection conductor 4 to the main circuit terminal 3 and fastens the bolt before mistakenly attaching the terminal cover 5 to the external connection conductor 4, The terminal cover 5 cannot be mounted in a predetermined position, and therefore, the bolt 6 that has been fastened is removed, the external connection conductor 4 is disconnected from the main circuit terminal 3, and the inconvenience of re-installation of the terminal cover 5 is required. is there.

  On the other hand, in order to simplify the mounting operation of the terminal cover 5 described above, the resin terminal cover 5 is previously formed into a spiral shape, and after the main circuit terminal 3 and the external connection conductor 4 are connected. Patent Document 1 discloses a main circuit terminal cover for a switch that allows the terminal cover to be attached and detached while the external connection conductor 4 is still connected.

Japanese Utility Model Publication No. 63-77225 (FIGS. 1 and 2)

By the way, the above-described spiral main circuit terminal cover 5 is required to prevent a short-circuit accident from being easily deformed or detached from the mounting seat 1a when receiving an external force.
In this respect, the spiral terminal cover disclosed in the above-mentioned Patent Document 1 is easily deformed and tilted when a foreign object or the like hits and receives an external force, and may be detached from the mounting seat 1a of the main body frame 1. Therefore, there is a problem that high reliability cannot be secured in terms of shape retention.

  The present invention has been made in view of the above points, and its purpose is to ensure that the main circuit terminal is attached to the connection charging portion and that the assembling work is simple, and that foreign matter or the like hits from the outside during actual use. Another object of the present invention is to provide a highly reliable main circuit terminal cover in which a cylindrical terminal cover is not deformed or disassembled and easily detached from a mounting seat of a switch body frame.

In order to achieve the above object, according to the present invention, the connection charging portion between the main circuit terminal of each phase drawn out from the body frame of the switch and the external connection conductor connected to the main circuit terminal is connected to each phase. In the cylindrical main circuit terminal cover that separately encloses and becomes a resin molded product erected on the main body frame,
The terminal cover has a half structure divided into two in the circumferential direction, encloses the connection charging part of the main circuit terminal, and butts the half cylinder of the half structure into a cylindrical shape, and then a butt end of the half cylinder It is assumed that the half cylinders are coupled to each other via an engagement type fastener provided in the section (Claim 1), and specifically, it can be configured in the following manner.
(1) One abutting end of the half cylinder having a half structure is interconnected via a thin hinge, and the other abutting end of each half cylinder is engaged with an engaging claw and a claw seat. (Claim 2).
(2) After separating the half cylinders having a half-split structure, engaging claws and claw seats for the fasteners are provided at the abutting ends of both ends of each half cylinder (claim 3).
(3) An engaging claw and a claw seat of the engaging joint are integrally formed in a half cylinder (claim 4).

  According to the main circuit terminal cover configured as described above, even after the external connection conductor is connected to the main circuit terminal of the switch, the terminal cover is mounted on and removed from the frame of the switch by surrounding the connection charging part. it can. In addition, this main circuit terminal cover is configured as a half structure, and the ends of the half cylinders are butted together and assembled into a cylindrical body, and the butted ends are connected via an engaging fastener. Therefore, even if foreign matter hits from the outside during actual use of the switch, the half-structured terminal cover is not easily deformed or disassembled and does not come off the mounting seat of the switch body frame, Thereby, high shape retention and reliability of the main circuit terminal cover can be ensured.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a structural diagram of a main circuit terminal cover according to a first embodiment of the present invention, in which (a) is an external perspective view in an assembled state, and (b) is an unfolded state in which a half-cylinder body having a half-split structure is opened. FIG. FIG. 2 is a plan view corresponding to FIG. It is sectional drawing of the engagement state of the engagement type fastener in Fig.1 (a). It is a disassembled perspective view of the main circuit terminal cover concerning Example 2 of this invention. It is the conventional structure figure of the main circuit terminal cover applied to the vacuum circuit breaker, Comprising: (a) is the external appearance perspective view of the whole circuit breaker, (b) is standing on the main body frame of (a), and is a main circuit terminal It is an expanded sectional view of the main circuit terminal cover which surrounded the connection charge part.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on Examples 1 and 2 shown in FIGS.

  In the first embodiment shown in FIGS. 1 to 3, the cylindrical main circuit terminal cover 5 made of a resin molded product has a half structure in which the circumferential ends of the half cylinders 5a and 5b are butted together. The butt ends on one side of the half cylinders 5a and 5b are interconnected via a thin hinge 5c formed integrally with the half cylinders 5a and 5b, and the other butt end has an engaging claw. The semi-cylindrical bodies 5a and 5b are detachably connected and coupled via two insertion-engagement type fasteners 5f including a pair of (male-shaped member) 5d and a claw-hanging member (female-shaped member) 5e. I am doing so.

  Here, the engaging claws 5d and claw seats of the fastener 5f are integrally molded on the outer peripheral surface side of the end edges of the half cylinders 5a and 5b, respectively, and as shown in FIG. Is inserted into the insertion hole of the claw seat 5e from the direction of the arrow in the figure, and the engaging claw 5d is snap-fit coupled to the claw seat 5e.

  According to the above assembly structure, even after the external connection conductor 4 is connected to the main circuit terminal 3 of the switch shown in FIG. 5, the connection charging portion is surrounded and the main circuit frame 1 of the switch is surrounded by the main circuit. The terminal cover 5 can be attached and detached. In addition, the main circuit terminal cover 5 is constituted by a half-split structure composed of half-cylinders 5a and 5b divided into two in the circumferential direction, and the ends of the half-cylinders 5a and 5b are butted and assembled into a cylindrical shape. The butt end portions are connected via the engagement type fastener 5f, so that even if a foreign object hits from the outside, the half-structured terminal cover 5 can be easily deformed or disassembled, and the switch This prevents the main frame terminal cover 5 from being detached from the mounting seat 1a (see FIG. 5), thereby ensuring high shape retention and reliability of the main circuit terminal cover 5.

  Next, the terminal cover structure of Example 2 corresponding to Claim 3 of this invention is shown in FIG. In the second embodiment, the half cylinders 5a and 5b of the half structure constituting the main circuit terminal cover 5 are separated from each other. The engaging claw 5d of the engaging fastener 5f having the same structure as described in the first embodiment and the claw seat 5e are integrally formed at a position facing each other at two upper and lower positions as shown in the figure.

  In order to enclose the connection charging portion between the main circuit terminal 3 and the external connection conductor 4 and to stand on the main body frame of the switch as shown in FIG. And 5b are faced to face each other from the outer peripheral side, and assembled by a simple operation of multiplying the fasteners 5f at both ends thereof, the same effect as in the first embodiment can be achieved.

  In addition, the structure of the engaging claw 5d and the claw hanging seat 5e of the fastener 5 in the illustrated embodiments 1 and 2 is an example, and the present invention is not limited to this structure, and another structure may be adopted. Good.

DESCRIPTION OF SYMBOLS 1 Switch body frame 1a Cover mounting seat 3 Main circuit terminal 4 External connection conductor 5 Main circuit terminal cover 5a, 5b Half cylinder 5c Thin-walled hinge part 5d Engagement claw 5e Claw hook seat 5f Fastener

Claims (4)

A resin molded product that stands upright on the main body frame by surrounding the connection charging portion of the main circuit terminal of each phase drawn out from the main body frame of the switch and the external connection conductor connected to the main circuit terminal for each phase. A cylindrical main circuit terminal cover,
The terminal cover has a half structure divided into two in the circumferential direction, encloses the connection charging part of the main circuit terminal, and butts the half cylinder of the half structure into a cylindrical shape, and then a butt end of the half cylinder A main circuit terminal cover for a switch, wherein the half cylinders are coupled to each other through an engagement type fastener provided in the section.   2. The main circuit terminal cover according to claim 1, wherein one butted end portions of the half cylinders having a halved structure are interconnected via a thin hinge portion and are fastened to the other butted end portions of the half cylinder bodies. A main circuit terminal cover for a switch, which is provided with an engaging claw and a claw seat.   2. The main circuit terminal cover according to claim 1, wherein the half cylinders having a half-split structure are separated from each other, and the engaging claws of the fasteners and the claw seats are respectively attached to the butt ends of both ends of each half cylinder body. The main circuit terminal cover of the switch characterized by providing.   The main circuit terminal cover according to any one of claims 1 to 3, wherein an engaging claw and a claw seat of an engaging joint are integrally formed in a half cylinder. .