Switch mechanism, hydraulic operating mechanism and its working cylinder

Abstract

The invention discloses a switching mechanism, a hydraulic operating mechanism and a working cylinder of the hydraulic operating mechanism. A cylinder body of the working cylinder is formed by an inner cylinder body and an outer cylinder body in a sleeved mode. A fit clearance between the inner cylinder body and the outer cylinder body can be communicated with a normal high-pressure oil way and a front chamber through a first oil port and inner oil ports. A second oil port in the rear end of the inner cylinder body can be communicated with a control oil way and a rear chamber. In the process of assembling the working cylinder, the fit clearance generated after the inner cylinder body and the outer cylinder body are assembled will replace long and thin oil holes in the prior art to be communicated with the normal high-pressure oil way. In this way, the required process that the long and thin oil holes are specially machined in the cylinder body of the working cylinder is omitted, so that the machining process of the whole working cylinder is simple; moreover, waste of materials in the process of machining the working cylinder is reduced, and the utilization rate of the materials is increased; accordingly, the working cylinder has the advantages of being simple in structure and low in cost.

Description

technical field [0001] The invention relates to a switch mechanism, a hydraulic operating mechanism and a working cylinder thereof. Background technique [0002] At present, the hydraulic operating mechanism is widely used in ultra-high voltage and ultra-high voltage circuit breakers to operate the opening and closing actions of the circuit breaker. As disclosed in Chinese patent document CN2119711U, a hydraulic operating mechanism for a high-voltage circuit breaker includes a pumping station, an accumulator 1, a working cylinder 2 and a control valve 4, and the oil outlet of the pumping station is connected through a high-pressure oil pipe. On the rod chamber of the working cylinder 2 and the accumulator 1, and the rod oil chamber of the working cylinder 2 is connected to the high-pressure oil port of the control valve 4, and the low-pressure oil port of the control valve 4 is connected to the non-conductive oil port of the working cylinder 2. On the rod cavity, the piston...

AI Technical Summary

Problems solved by technology

like figure 2 As shown, the working cylinder includes an integral cylinder body 21 extending forward and backward and a piston rod 23 guided and assembled front and rear in the cylinder body 21. A slender oil hole 22 extending forward and backward is opened in the side wall of the cylinder body 21. The slender oil hole 22 The hole 22 is provided with the first oil port connecting the rod cavity to the normal high pressure oil circuit. The front end of the specific elongated oil hole 22 is connected to the rod cavity and the oil outlet of the pump station, and the rear end is connected to the high pressure of the control valve 4. The oil inlet, and the rear end of the cylinder 21 is provided with a second oil port that communicates with the control oil circuit, that is, the second oil port connects the rodless cavity with the control oil port of the control valve 4. The shape of the cylinder 21 is not a rotary body and large in size, there are many elongated holes in the internal structure, and the structure is complicated. It is difficult to process the cylinder body 21 during production, and there are many processes. It needs to be processed by special equipment, and the efficiency is low.

In addition, the cylinder body 21 adopts a modular design, which has a large external dimension, low material utilization rate, large weight of components, and high cost

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