Bulk loading powder tank truck self-sealing manhole cover seal ring

Abstract

The invention discloses an improved prill powder matter tank car self-sealing manhead obturating ring. The obturating ring consists of a rubber band the section of which is in a groove shape. The section of an upper wing surface and a side elevation of the rubber band take a shape of rectangle. The section of a lower wing surface of the rubber band is in isopachous shape. The upper wing surface and the side elevation are connected through a right angle. The side elevation and the lower wing surface are connected with each other by an enhanced round angle or an enhanced chamfer angle. The lowersurface of the end part of the lower wring surface is provided with a sealing flange. The obturating ring can be exchanged with the traditional manhead obturating ring on the existing railway prill powder matter tank car and can simultaneously guarantee better sealing effect as well as effectively improve the compression resistance capacity of the whole obturating ring. The invention is especially suitable for a prill powder matter tank car which requires a higher pressure on a tank body.

Description

technical field [0001] The invention relates to a sealing ring, in particular to a self-sealing manhole cover sealing ring for a bulk powder tanker. Background technique [0002] At present, most of the manholes on the bulk powder tank cars of my country's railway vehicles still adopt the traditional self-sealing form, which has a history of more than 30 years. Its structure is mainly composed of a manhole seat and a manhole cover. The manhole seat is welded by a manhole seat ring and a cover ring, and welded on the tank body. The manhole cover is composed of a manhole cover ring, a top cover, a fixed pressure plate, a sealing ring and a pressure ring, etc., and the sealing ring is fixed on the fixed pressure plate with bolts and nuts by the pressure ring. One end of the manhole cover is connected to the lug of the manhole seat through a revolving pin, and can rotate around the revolving pin. When the manhole cover is closed, the other end is pressed tightly by the turn lo...

AI Technical Summary

Problems solved by technology

[0004] But above-mentioned manhole cover still has some deficiencies: when the pressure in the tank is lower than a certain value, just can't make the manhole well seal

The actual situation is: because the end of the lower airfoil is very thin, it is easy to wrinkle when the rubber ring is formed, so that there is almost no bonding force

When the cover ring and the lower part of the side elevation of the rubber ring are in contact, the end of the lower airfoil is often upturned and does not fit at all, so it is often easy to leak air when the pressure in the tank is low

When the pressure in the tank increases to a certain value, and because the lower wing surface is too thin, it is easy to squeeze out from the gap between the manhole cover and the cover ring, causing a large amount of gas to be discharged from the tank.

Images