Circuit breaker air intake auxiliary device

Abstract

The invention discloses an auxiliary device for air intake of a circuit breaker, which comprises a frame, on which a pressing block that can slide up and down along the frame is arranged; A rotatable cam is arranged on the top of the frame, and when the cam rotates, the outline of the cam contacts the pressing block and drives the pressing block to slide up and down along the frame. The invention has the advantages of simple structure, convenient and fast operation, good clamping effect and the like.

Description

technical field [0001] The invention mainly relates to the technical field of circuit breakers, in particular to a circuit breaker air intake auxiliary device. Background technique [0002] Sulfur hexafluoride (SF6) switch is an important equipment in the power system. The equipment is filled with SF6 gas with a pressure of about 0.4-0.8Mp. This gas is an excellent insulating material, but its insulating ability will be greatly reduced after being damp. The decline will bring great hidden dangers to the normal operation of the power system. In order to prevent the SF6 gas in the switchgear from getting damp, it is necessary to regularly extract the SF6 gas in the equipment for water content inspection. Since there is high-pressure gas inside the switch, effective sealing measures must be taken to prevent gas leakage. Taking gas samples from sulfur hexafluoride electrical equipment now requires solving the following two problems: [0003] 1. The problem of high internal pr...

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Problems solved by technology

[0002] Sulfur hexafluoride (SF6) switch is an important equipment in the power system. The equipment is filled with SF6 gas with a pressure of about 0.4-0.8Mp. This gas is an excellent insulating material, but its insulating ability will be greatly reduced after being damp. The decline will bring great hidden dangers to the normal operation of the power system

[0003] 1. The problem of high internal pressure of the equipment: the pressure of sulfur hexafluoride gas in the electrical equipment is 0.4-0.8MPa, and the sampling port on the equipment body adopts a pressure self-sealing thimble design to ensure the tightness of the equipment under operating conditions. The diameter of the pressure thimble of the sampling port is about 4mm, and the diameter of the gas chamber of the sampling port is about 20mm; since the sampling of the substation is carried out live, the design of the equipment box is relatively compact, and the sampling joints are small in size for the sake of portability. Generate a pressure of 0.4 ~ 0.8MPa (that is, push the sampling pressure thimble, so that the gas in the equipment flows out through the pushed thimble, and enters the detection instrument through the sampling pipeline, so as to achieve the purpose of detecting sulfur hexafluoride gas) , the pressure applied to the sampling joint is very large. According to mechanical calculations, a force of 10-20 kg is required at this time to achieve the purpose of pushing the sampling pressure thimble.

In addition to the high requirements on the physical fitness of the sampling personnel, due to the huge pressure generated in an instant, it is easy to cause periodic fatigue of the equipment components and greatly shorten the life of the components.

[0004] 2. To maintain the continuity of the sampling process: It takes about 5 minutes for one (phase) electrical equipment to perform a gas humidity detection (excluding the time of equipment connection, etc.), that is to say, the pressure of the sampling port must be maintained after the thimble is opened. It takes at least 5 minutes for the sampling gas to flow from the electrical equipment to the detection instrument

Its advantages are stable transmission, precise transmission ratio, reliable operation, high efficiency and long life; but its disadvantage is that it is bulky

Theoretically, the gear transmission pressurization device can meet the requirements in terms of pressure, pressure stability and pressurization speed, but due to the problem of the operating space of the equipment box, the multi-stage gears must be as compact as possible, which poses a great challenge to the volume of the gears. High requirements, which will inevitably lead to a substantial increase in manufacturing costs

[0007] 2. Screw transmission and pressurization: use the screw pair composed of screw and nut to realize the transmission and pressurization requirements, mainly to convert the rotary motion into a linear motion, and transmit motion and power at the same time, and generate a large axial force with a small torque Thrust to achieve the purpose of pressurization; but this kind of force transmission screw pair bears a large axial force, and the working time cannot be too long each time; the speed of the screw transmission is slow and the efficiency is low; and the screw mechanism needs precise positioning. The thread design is relatively dense, and it is easy to cause thread wear during long-term and multiple operations, resulting in a short service life of the sampling auxiliary tool, which cannot be locked or even effectively pressurized

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