33results about How to "Small switching torque" patented technology

The invention relates to an ultra-low temperature plate valve which comprises a valve body, a lengthened valve cap, a valve rod, a valve plate, a valve base, a bracket, a handwheel and a direction rod, wherein a cavity channel serving as a medium flow passage is formed coaxially and horizontally inside the valve body; the lengthened valve cap is fixedly mounted at the vertical upper end of the valve body coaxially; the valve rod is mounted in the middle of the valve body vertically; the valve plate is coaxially and fixedly mounted at the lower end of the valve rod inside the valve body; the handwheel is coaxially mounted on the valve rod of which the upper end extends out of the upper end of the lengthened valve cap; compression springs are mounted the on the contact surface of the outer circumference of the valve seat and the valve body; a low-temperature-resistant energy-storage seal ring is mounted on the convex shoulder contact surface between the valve seat and the valve body. The ultra-low temperature plate valve solves the technical problems of sealing and heavy on / off torque under the condition of ultra-low temperature and high-pressure medium; the plate valve is scientific in design, simple in structure, high in working pressure, reliable in sealing property, light in on / off torque, and long in service life, so as to be widely applied to various working conditions of ultra-high pressure and ultra-low temperature.

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.

The invention discloses a non-excitation tap changer with a wedge-shaped contact structure, which includes upper and lower support seats, and a main shaft is installed between the upper and lower support seats. One end of the main shaft is connected with the operating mechanism, and the main shaft is connected with a The gear mechanism, the output end of the gear mechanism is connected with the sheave mechanism, the sheave of the sheave mechanism is sleeved on the main shaft and connected with the movable contact bracket, and the movable contact bracket is provided with a movable contact slidingly connected with it. The contact assembly, the circumferential direction of the movable contact assembly is correspondingly equipped with a static contact column configured with it, and the feature is that: the main shaft is provided with a crank, and the crank is connected to the movable contact assembly of the movable contact assembly through the connecting rod of the crank mechanism. The contact supports are connected so that the moving contact assembly can not only rotate intermittently with the sheave mechanism, but also perform radial sliding and telescopic movement with the crank mechanism. When shifting gears, the moving contact does not rub against the static contact column, so that the shift torque of the switch is small, and the plating layer of the protection contact is not damaged, and the metal powder generated by the contact friction is prevented from polluting the transformer oil.

A six-way switching ball valve belongs to the switching valve, which solves the problem that the inlet and outlet of the existing six-way switching valve are all arranged on the same side, resulting in limited application occasions. The present invention consists of an upper three-way ball valve, a lower three-way ball valve and a drive conversion mechanism. The structure and components of the upper three-way ball valve and the lower three-way ball valve are exactly the same. Rotary shaft, thrust ring, flange gland, rotating block, steel wire retaining ring; the drive conversion mechanism includes handle, bevel gear, gearbox, input shaft, ball bearing, upper output shaft, lower output shaft, drive conversion The upper and lower output shafts of the mechanism are matched and connected with the rotating shafts of the upper and lower three-way ball valves respectively. The invention has the advantages of simple structure, small switching torque, different side arrangement of the inlet and outlet, and solves the problem of limited application occasions of the arrangement of the same side of the inlet and outlet. Strong performance, making the on-site pipeline layout more flexible.