JPS5823127A - Disconnecting switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disconnector that is housed in a closed switchboard or the like and opens and closes an electric circuit, and particularly to the structure of its contact portion.

FIG. 1 is a diagram showing an example of a conventional three-phase disconnector. Its structure consists of support insulators 2 m * 2 b placed on the disconnector pace 1 so as to maintain a predetermined opening dimension for each phase, and support insulators 2 m * 2 b fixed to the heads of the insulators facing each other to serve as busbar connection terminals. Fixed contacts 3m and 3b, a hinge support on the fixed contact 3&, and a play P4 mounted so as to simply come into contact with and separate from the other fixed contact 3b, and an operating mechanism for opening and closing this grade 4. It consists of an insulating rod 5, an operating shaft 6, and an operating base 7.

At the contact portion between the fixed connector 3as3b and the blade 4, it is necessary to maintain a specified contact pressure so that not only the normal rated current can be passed, but also the short circuit current can be passed for a short time. For this reason, a contact spring 8 has conventionally been provided near the contact portion of the blade 4, as shown in FIG. That is, first, a collar 9 is sandwiched between two blades 4, and a contact spring 8 made of a washer 1011 and a compression coil spring is placed on the outside of one grade from the grade side, and a washer 10b that presses the end of this contact spring 8.
overlap in order. Next, from the washer 10b side, the girth 11 is contacted with these two grade 4 sheets, the spring 8, the collar 9,
It was inserted through the washers 10 a e 10 b, and two nuts 12 were screwed together on the outside of the opposite blade, and the double nut effect was used to fix the blade.

However, the above-mentioned conventional ship docking structure, including the similar grounding switch used in the grounding circuit, has the following drawbacks.

(1) Due to the length of the contact spring 8, the air insulation distance between adjacent phase blades is restricted to a small dimension between multiple phases.

(2) Due to item (1) above, it has been difficult to reduce the width of the switchboard that houses the disconnector.

(3) Even if the above-mentioned item (1) is taken into consideration and safe relative dimensions are determined, if the blades 4 are installed in the wrong direction and the contact springs 8 of adjacent blades face each other, air insulation will occur. There was a risk that the distance would be significantly short and a short circuit would occur.

(4) Contact spring 8 to resist the electromagnetic force of short-time current
The spring constant of the contact spring 8 is large, and it takes time and effort to adjust the compressed length of the contact spring 8 to obtain a specified contact pressure, which also poses problems in assembly workability.

As a means to solve the above drawbacks, it is possible to use a garter spring around the two blades in the same way as the main circuit contactor of the interrupter. There are many problems, such as the need for special measures to prevent the screws from coming off due to impact or being misaligned.

The purpose of the present invention is to ensure the above-mentioned air insulation distance without fail, reduce the relative dimensions, and adjust the contact pressure by equipping the inside of a set of parallel blades with a tension coil spring in parallel with the play r. An object of the present invention is to provide a disconnector having a simplified contact structure.

The present invention will be explained below with reference to an embodiment shown in FIGS. 3 and 4.

FIG. 3 is a structural diagram of a single-phase blade according to the present invention. Inside the two blades 4, a tension coil spring 13 and a tension link '
14 and a spring adjustment mechanism 15 are respectively arranged.

FIG. 4 shows the above-mentioned tension coil spring 13, tension link 14,
A detailed diagram of the related structure of the spring adjustment mechanism 15 is shown.

The tension coil spring 13 has a hook shape with open ends at both ends, and one end is applied to the spring receiver 16 of the tension link 14 and the other end is applied to the spring adjustment mechanism 15. The tension link 14 is a fixed part 14a fixed to the blade 4.

It has a hinge shape consisting of a moving part 14c (14b1) and a spring receiver 16 (14d1), and its height is within the height of the blade. For attachment to the blade 4, use the fixed part 14 m e 14
b is also used as a stone/yarn, but it is fixed at the root 17. The spring adjustment mechanism 15 includes a spring receiving portion 1511 (double screw gel) 15
It consists of two elements of b. The double-thread gel) 15b has one end with a left-hand thread and the other end with a right-hand thread, with the middle flange as a boundary. Furthermore, one end of the double-threaded gel) 15b is connected to the spring receiving part 1.
5m, and the other end is the mounting bracket 1 for the insulating rod 5 for operation.
8. The mounting bracket 18 is rotatable relative to the blade 4 via a pin 19.

Incidentally, the small hole 20 shown in FIGS. 3 and 4 is for a retaining pin for removing the bottle 19.

Figures 5 and 6 show disconnector 1 closed and disconnector 1 open, respectively.
In FIG. 5, the fixed contact 3b and the blade 4 are in contact, so the tension spring 13 is extended and the tension link 14 is open, and in FIG. 6, the fixed contact 3b and the blade 4 are in contact. Since the tension spring 13 is in the "open" state where the disconnector 1 is separated, the tension spring 13 is compressed and the angle formed by the tension link 14 becomes small.
The distance between the contact parts of the two blades is maintained at a predetermined dimension, and the operability during the "close 2" operation is made into an inner groove.

Note that the present invention is not limited to the above-mentioned embodiments; for example, as shown in FIG. It goes without saying that the design can be changed within the scope of the main idea, such as using a coil spring to obtain contact pressure.

As described above, according to the present invention, a tension coil spring is installed parallel to the blades (to obtain a specified contact pressure) inside a pair of parallel blades without changing the shape of the blades or the operation method for the distance between the blades. By installing it together with the movable mechanism and adjustment mechanism, it is possible to obtain a conductive disconnector that ensures air insulation distance, reduces related dimensions, and simplifies spring pressure adjustment.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional disconnector, FIG. 2 is an assembly diagram showing the configuration of the contact part of the conventional disconnector, FIG. 3 is a configuration diagram of the blade of the present invention, and FIG. 4 is a contact spring of the present invention. FIG. 5 is an explanatory diagram showing the disconnector 1 of the present invention closed, FIG. 6 is an explanatory diagram illustrating the disconnector 1 of the present invention open, and FIG. 7 is a modification of the present invention. FIG. 3 a e 3 b... fixed contact, 4... plate, 13... tension coil spring, 14... tension link, 15... spring adjustment mechanism, 17... delt. (7317) Agent Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] A spring adjustment mechanism with spring retaining parts is attached to both ends of the operating rod mounting rod, which is rotatably supported in the center of the inside of two parallel plate-shaped blade conductors, and the blade is further connected to a fixed contact part. A five-bar link with both ends fixed to the inside of the blade and a pin supported so as to be openable and closable in the middle is provided in the vicinity of the separation and in the vicinity of the hinge support, and a coil spring is inserted between the spring adjustment mechanism and this three-barrel link. Depending on the skill you equip,
A disconnector characterized by maintaining a predetermined energizing contact pressure.