Pressure release valve with water-proof structure

Abstract

The invention discloses a pressure releasing valve with a waterproof structure, comprising a connecting thread at the lower part of an external circumferential wall, a hex nut at the middle part and a circumferential wall which is adjacent to the hex nut. The upper part of the circumferential wall of the pressure releasing valve is provided with a position limit ring which is radially convex. The pressure releasing valve also comprises a waterproof cover which covers the positions above the hex nut of the pressure releasing valve. The waterproof cover comprises an axial exsection part wall surface, an arch typed cover with the internal circumferential surface matched with the external circumferential surface of the position limit ring, a top cover which is arranged at the upper end of the cover and a ring-shaped clamping frame with an opening. The clamping frame is fixedly arranged on the internal wall of the lower part of the cover; furthermore, when the waterproof cover is arranged on the pressure releasing valve, the clamping frame is clamped on the circumferential wall between the hex nut and the position limit ring of the pressure releasing ring. The pressure releasing valve adopts a waterproof cover which leads the pressure releasing valve which is exposed on the external wall of a transformer oil tank to be covered, thus eliminating the problem that water is accumulated in the internal chamber of the pressure releasing valve, and further avoids insulation accident.

Description

technical field [0001] The invention relates to a protection device on a transformer, in particular to a pressure relief valve with a waterproof structure installed on a transformer box cover or box wall. technical background [0002] At present, most of the fully sealed distribution transformers are equipped with a protective device, that is, a common pressure relief valve that can be automatically opened or closed. Automatically open to release the pressure inside the oil tank, and when the internal pressure of the oil tank decreases to a certain value, it can also be automatically closed to ensure that the transformer is in a fully sealed state. However, when this common type pressure relief valve is installed on the transformer, when it is transported or stored in an outdoor place, if it encounters rainy weather, there will be water in the cavity of this common type pressure relief valve. When it is put into operation, the accumulated water in the cavity is not dry. Whe...

AI Technical Summary

Problems solved by technology

However, when this common type pressure relief valve is installed on the transformer, when it is transported or stored in an outdoor place, if it encounters rainy weather, there will be water in the cavity of this common type pressure relief valve. When it is put into operation, the accumulated water in the cavity is not dry. When the operator pulls the pull ring of the pressure relief valve to release the internal pressure of the oil tank (the operation must be completed before putting into operation), the accumulated water will enter the transformer along the inner wall of the cavity. In the oil tank, this will reduce the insulation performance of the transformer oil, and even cause accidents in severe cases

Images