JPS605462Y2 - Operation mechanism of closed type switchgear - Google Patents

Description

[Detailed description of the invention] The present invention relates to the operating mechanism of a closed type switchgear, and in particular, when the three-phase switchgears installed in parallel are driven to open and close by a common operating shaft, a sheath current flows through the operating shaft. This invention relates to an operating mechanism with a structure that prevents overheating of the mechanism part due to

In a closed type switchgear with a general gas-insulated structure, when each phase switchgear for three phases is simultaneously opened and closed by the reciprocating motion of a common operating shaft, a sheath current flows to each phase switchgear through the operating shaft, overheating the mechanism part. This may cause problems such as burn-in or burn-in.

As a countermeasure, a method has been adopted in which a cylindrical insulating joint is provided between each phase of the operating shaft to electrically insulate the operating shaft.

However, this type of insulating joint is strong against compressive force but weak against tensile force, and when transmitting reciprocating motion like an operating shaft, an excessive tensile force acts on the joint.

For this reason, it is necessary to increase the strength of the joint, which has the disadvantage of making the entire joint large and expensive.

The present invention eliminates the above-mentioned drawbacks, and has a small, large, and mechanically strong sealed continuous open V that can completely prevent sheath current.
It provides the operating mechanism for the device.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, IIA, IIB, and IIC are three-phase switchgears arranged in parallel, and 12 is an operating shaft rotated by an operating device 13. This operating shaft 12 has three-phase levers on the shaft. 14A, 14B, 14c are installed and each lever 14A
, 14B, 14C are the movable parts 15 of the corresponding phase switching devices.
A, 15B, 15C, and the rotation of the operating shaft 12 moves the movable part 1 through each phase lever 14A, 14B, 14C.
5A, 15B, and 15C are driven to open and close at the same time.

Reference numeral 16 denotes an insulating joint provided between each phase lever on the operating shaft 13 and between the operating device 13 and the operating shaft 12, respectively.

As shown in FIG. 2, the insulating joint 16 has a pair of joints 17A and 17B, each having a plurality of teeth 18 on the end face, at opposite ends of the cut operating shaft 12.
The teeth 18 and valleys 19 of the joint 16 are alternately engaged with each other via the insulator 2 to form an integral body, and both ends of the joint 16 are connected to the separated ends of the opposing operating shaft 12 by bolts and nuts 21, respectively.

According to the present invention described above, each phase opening device 11A to 11C
Since each phase and the operating device 13 are electrically insulated by the insulator 20 of the insulating joint 16, there is no risk of sheath current flowing through the operating shaft 12, and heating and seizure of the mechanical parts can be reliably prevented.

In addition, each phase opening device 11A to 11C is driven to open and close by rotation of the operating shaft 12, so that the operating force transmitted to the insulating joint 16 of the operating shaft 12 is transmitted from the teeth 18 of one joint. Since the force is transmitted through the insulator 20 in the direction of rotation of the teeth 18 of the other joint, only compressive force acts on the insulator 20 for both left and right rotations.

That is, insulators are typically extremely resistant to compressive forces.

Moreover, this compressive force is several times stronger than the tensile force.

Furthermore, for example, the strength of the so-called bonded surface between the flat surface of a metal member and such an insulator is strong against compressive force, but weak against tensile force, shearing force, and bending force, and is particularly strong against shearing force caused by rotational drive. Compared to the compression force, the force and bending force are approximately one order of magnitude lower.

For these reasons, an insulated joint formed by interposing an insulating material between the teeth that are embedded into each other as in the embodiment of the present invention is not suitable for rotational driving. Mainly as an insulator, it can transmit rotational force through strong compressive force.

Therefore, it has high strength, can be constructed in a small size, and is safe even under severe operation.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the operating mechanism of a closed type opening/closing device according to the present invention, and FIG. 2 is a detailed view of section A in FIG. 1. 11A to IIC...Each phase opening device, 12...
...Operating axis, 13...Operating device, 14A~1
4C...Lever 16...Insulation joint,
17A, 17B...Joint, 18...Teeth, 20...Insulator.

Claims (1)

[Scope of utility model registration request] It is equipped with switching devices for three phases installed in parallel, a common operating shaft for opening and closing the switching devices via levers, and an operating device for rotationally driving this operating shaft. and an operation of a closed type switchgear, characterized in that the operating device and the operating shaft are connected by an insulating joint formed by engaging a pair of joints each having a plurality of teeth on the end face with an insulating material interposed therebetween. mechanism.