Baffle-type one-way overspeed cut-off valve

Abstract

A baffle-type one-way overspeed cut-off valve comprises a valve body, a valve cover, a valve plate, a glass window and a reset handle. The baffle-type one-way overspeed cut-off valve is characterized in that a corner bracket formed by a floorstand and a baseplate is arranged inside the valve body, a testing shifting fork is hinged on the floorstand, and two, three or four dry reed connection points are arranged on the floorstand. An adjustable plate hinged on the baseplate is supported on the testing shifting fork, positions corresponding to two dry reed connection points below the adjustable plate are respectively provided with a magnet, a tension spring screw rod mechanism is arranged between the adjustable plate and the baseplate, and the valve plate is fixed on the upper side of the adjustable plate. A reset rotating shaft is arranged on the end position of the oil outlet of the valve body, the reset handle is fixed at the shaft end of the reset rotating shaft outside the valve body, and a reset pusher dog is arranged on the reset rotating shaft inside the valve body. Two turning-over covers are arranged on the valve cover, and the valve cover and the two turning-over covers respectively form a wire connecting cabin and a detecting exhausting cabin independently. The baffle-type one-way overspeed cut-off valve has the advantages of being small in the setting error of flow velocity, strong in anti-seismic property, small in malfunction probability, good in sealing, long in service life and the like.

Description

technical field [0001] The invention belongs to the technical field of auxiliary safety protection devices for oil-invading power transformers, and in particular relates to a baffle-type one-way overspeed shut-off valve installed in a joint pipe between a transformer and an oil conservator. Background technique [0002] At present, when the transformer causes a large amount of oil spillage or leakage due to internal faults or other reasons, the valve has the function of "closing as soon as the oil is drained", which can immediately cut off the oil circuit between the oil conservator and the transformer, so that the oil conservator It is an ideal auxiliary safety protection device for oil-invasion power transformers, and it is also a must-install component for oil-invasion transformers with nitrogen-filled fire extinguishing devices. However, due to defects in the existing structure, various problems often occur during use, as follows: [0003] 1. The top of the active plate...

AI Technical Summary

Problems solved by technology

[0003] 1. The top of the active plate is set on the reset shaft, the contact area is large, the frictional damping is large, which affects the closing sensitivity of the leakage, and there will be errors in the setting of the flow rate, that is, when the oil overflows or leaks, the valve plate on the active plate cannot immediately Cut off the oil circuit between the oil conservator and the transformer;

[0004] 2. The reset rotating shaft set on the top of the active plate runs through the valve body close to the valve cover, and the bracket for fixing the dry reed contact is suspended on the upper side of the active plate. The valve plate can maintain a stable half-open state. The mutual attraction between the magnet and the dry reed contact, the second is the tension spring support in the reset mechanism, but once the magnet demagnetizes, the tension spring becomes invalid or violently shakes, the valve plate will close under the action of gravity, causing malfunction;

[0006] 4. The gasket between the valve body and the bonnet is a surface seal, the sealing effect is not good, and the gasket is exposed and easy to age;

[0007] 5. Once the tension spring mechanism on the active plate is fixed, the elastic tension generated by it cannot be adjusted, that is, the oil flow rate cannot be adjusted under the premise that the position of the magnet and the tension spring remains unchanged and is not replaced;

[0008] 6. There are only two terminals on the valve cover, which cannot meet the actual needs

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