An oil leakage prevention valve for power transformer oil tank

Abstract

The invention discloses an anti-oil-leakage valve used for a power transformer oil tank. The anti-oil-leakage valve mainly comprises an upper valve rod, a butterfly plate and a lower valve rod, wherein the upper valve rod, the butterfly plate and the lower valve rod are sequentially connected. Flexible adjustment rings are fixed to the inner side of the upper end surface of the butterfly plate and the inner side of the lower end surface of the butterfly plate respectively, the upper valve rod is sleeved with an upper adjustment bearing, the lower valve rod is sleeved with a lower adjustment bearing, the upper adjustment bearing is sleeved with an upper adjustment ring, the lower adjustment bearing is sleeved with a lower adjustment ring and an inner tightening ring from inside to outside in sequence, the lower portion of the inner tightening ring is connected with a valve body through a bolt, and the valve body is sleeved with the upper adjustment ring. According to the anti-oil-leakage valve used for the power transformer oil tank, because the upper adjustment bearing and the lower adjustment bearing are adopted, friction resistance applied to the valve rods can be reduced, sealing conditions of the upper and lower end surfaces of the butterfly plate can be easily changed, and the sealing performance of the valve is improved. An O-shaped ring is installed in the inner tightening ring in the form of a groove, and therefore the opening or closing torque of the valve can be reduced; because the flexible adjustment rings and rigid adjustment rings are arranged on the upper end surface of the butterfly plate as well as the lower end surface of the butterfly plate, the opening or closing torque can be reduced, deformation is avoided, and a good oil leakage preventing effect is achieved.

Description

technical field [0001] The invention relates to the field of power transformer equipment, in particular to an oil leakage prevention valve used in a power transformer oil tank. Background technique [0002] Transformer leakage can be roughly divided into sealing leakage and welding leakage. When the transformer leaks oil, the oil can come out and the water can go in, which will lower the oil level in the transformer. When the oil level is too low, the transformer coil will expose the oil level. The main problem is that the insulating oil will be damp. The damp of the transformer coil will affect the overall insulation of the transformer; at the same time, the output of the transformer will be affected due to poor heat dissipation, and the life of the transformer will be affected when it is overheated; it will also increase the noise of the transformer, and the transformer may be damaged due to excessive electromotive force when a large short-circuit current impacts. The coi...

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Problems solved by technology

When the transformer leaks oil, the oil can come out and the water can go in, which will lower the oil level in the transformer. When the oil level is too low, the transformer coil will expose the oil level. The main problem is that the insulating oil will be damp. The damp of the transformer coil will affect the overall insulation of the transformer; at the same time, the output of the transformer will be affected due to poor heat dissipation, and the life of the transformer will be affected when it is overheated; it will also increase the noise of the transformer, and the transformer may be damaged due to excessive electromotive force when a large short-circuit current impacts. coil deformation

The upper and lower contact surfaces of the butterfly plate of the traditional transformer butterfly valve are wide, resulting in relatively large friction force and switching torque when the valve is in use, so that the upper and lower sealing surfaces of the butterfly plate and the valve seat are always in a state of sealing and extrusion when the valve is in use. During long-term use, Due to being squeezed by force, the valve body is prone to permanent deformation. With the long-term aging of the sealing ring and valve seat, oil leakage is prone to occur on the upper and lower sealing surfaces of the butterfly valve disc.

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