This invention relates in general to bulk material handling devices and in particular to a new and useful blowing device for eliminating compactions in storage silos for bulk materials.
The invention concerns a blowing device which uses air blasts for the elimination of compactions in bulk material storage silos with a compressed air storage container, with a compressed air supply duct connected to the compressed air storage container, a compressed air outflow duct, a rapid exit valve interposed between the compressed air supply duct and the compressed air outflow duct and with a compressed air inlet pipe socket with a multiway valve connected to the rapid exit valve whereby in the rapid exit valve between open position and closed position a directly air pressure actuated valve closure is guided and in a closed position, is pressed against the compressed air outflow duct and is fashioned as a valve seat.
A blowing device is known of a kind in which the compressed air supply duct, the compressed air outflow duct and the rapid exit valve and its housing presents a construction unit. In this construction unit the compressed air supply duct and the compressed air outflow duct are arranged orthogonally to each in such a way that during afflux of the rapid exit valve considerable flow and throttle losses occur. The same is true of the form and guidance of the valve closure which is practically fashioned as a valve disk with an inside and an outside collar. In a closed position the valve disk contacts, with the inside collar, the valve seat of the compressed air outflow duct at the end side while the outside collar is intended to guide the valve disk in the valve housing. This guiding, however, is already somewhat problematic if for no other reason than between the outside collar and the inner wall of the valve housing, sufficient margin clearance must be given to allow motion so that the compressed air storage container can be supplied with compressed air through the compressed air inlet pipe socket connected to the valve housing with the rapid exit valve in closed position. An annular channel between the outside collar of the valve disk and the guiding surface on the inside wall of the valve housing practically serves this purpose. The resulting motion can lead to flutter effects or tilting in the case of valve disks and consequently to reduce flow velocities in the compressed air outflow duct and to greatly slowed or completely missing opening processes such that an impulse-like discharge of the compressed air storage container is frequently hardly achieved. However, air blasts then remain to a large extent ineffective. In this respect the invention proposes a solution.