Dome valve used for super-dense-phase ultra-low-speed pneumatic transmission system

Abstract

The invention provides a dome valve used for a super-dense-phase ultra-low-speed pneumatic transmission system. The dome valve comprises a valve body, a sealing gasket, a top plate and a rotating air cylinder, and further comprises a globe roof, a main sealing ring, a pneumatic thin film lifting device and a supporting frame; the globe roof at the closing position is driven by inlet air of the pneumatic thin film lifting device to upwards move and is driven by spring reset to downwards move; the principle that an existing inflatable sealing ring is inflated to swell to achieve sealing is changed, a gap between the main sealing ring and the globe roof can be far larger than the upper limit of the grain size of material granules conveyed by the pneumatic transmission system, the material granules left in the dome valve cannot be clamped into the gap between the main sealing ring and the globe roof, in the aspect of an external cause of abrasion of the existing inflatable sealing ring, the problem that the sealing ring in the dome valve is prone to being abraded is solved, and the service life of the sealing ring in the dome valve is prolonged.

Description

technical field [0001] The invention relates to the technical field of pneumatic conveying, in particular to a dome valve used in an ultra-dense-phase ultra-low-speed pneumatic conveying system. Background technique [0002] The dome valve is a valve widely used in pneumatic conveying systems. It can cut off the flowing material flow or static material column entering the pressure tank, and then close to achieve a seal, so as to ensure that the filling rate of the pressure tank is 100% without relying on The level gauge of the sending tank, so the control principle is simple and reliable. When handling abrasive materials, the expandable sealing ring embedded in the dome valve seat ensures the working pressure difference between the front and back of the valve. [0003] At present, the structure of the dome valve in the prior art includes a valve body, an expandable sealing ring, a top plate, a ball top, and a power unit. The expandable sealing ring is fixed on the top plate...

AI Technical Summary

Problems solved by technology

[0006] However, even if the flapper valve is set, after the flapper valve cuts off the material flow, there will inevitably always be a small amount of material particles scattered on the dome valve, and then most of these material particles will be lost under their own weight and / Or the displacement of the ball top under dynamic forces such as rotation, and finally stuck in the gap between the expandable sealing ring and the ball top, over time, more and more material particles stuck here, and as time goes by, the The expandable sealing ring wears out gradually, causing the expandable sealing ring to be worn out frequently, which seriously shortens the service life of the expandable sealing ring. After the expandable sealing ring is worn out, it must be stopped and replaced in time, which also causes the entire pneumatic conveying system to frequently Downtime, affecting production

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