Cleaning and liquid contact with solids – Processes – Including application of electrical radiant or wave energy...
Patent
1994-10-06
1997-01-28
El-Arini, Zeinab
Cleaning and liquid contact with solids
Processes
Including application of electrical radiant or wave energy...
134 6, 134 18, 134 42, 165 84, 165 95, B08B 702, F28G 700
Patent
active
055974171
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method and an apparatus for the percussive or beating cleaning of objects disposed in a process chamber that is under process pressure.
A method and apparatus of this type are known from DE-PS 31 27 734. The push member thereof, which is designated as a transmission element, is provided with an equalizing channel that connects the chamber that is under process pressure and the pressure chamber that accommodates the compression spring. Furthermore, the push member is provided with an annular collar. Instead of the pressure equalization channel, the balancing chamber that accommodates the spring can be connected to an externally operated gas pressure balancing apparatus. With both embodiments of the known percussive apparatus, the pressure balancing is thus effected in the region of the push member, so that the latter must have a relatively complicated construction.
With the embodiment having the equalization channel to the chamber that is under process pressure, the danger exists that if dust-containing gases are present in the process chamber, dirt or other contamination can enter the space that accommodates a spring. With both embodiments, the free space that is defined by the one end of the percussive element and by the percussive mechanism is connected to the atmosphere. One end of the striker projects out of the mechanically, pneumatically or hydraulically operating percussive mechanism.
It is therefore an object of the present invention to provide a method and apparatus of the aforementioned general type where the pressure balancing or equalization is effected in a simple manner.
SUMMARY OF THE INVENTION
This object is realized in that at least during acceleration of the striker, the two ends of the striker are maintained at the same pressure, which corresponds essentially to the pressure in the process chamber.
In this manner, the required pressure equalization is no longer carried out in the region of the percussive element, but rather in the region of the mechanically, pneumatically or hydraulically operating percussive mechanism, so that no dirt or contamination can enter the spring chamber via a free or exposed equalization channel, which could very rapidly lead to disruptions in operation; furthermore, a more straightforward configuration of the percussive or beating element is possible. The percussive element can be held in abutment under a resilient bias via at least one spring or via a pneumatic load.
Further features are directed to advantageous specific embodiments of the method.
The invention is also directed to a percussive or beating apparatus for the percussive cleaning of objects disposed in a process chamber that is under pressure. The apparatus includes a housing, an elongated percussive or beating element that is guided in the housing in a sealed manner, extends through the wall of the process chamber, and rests against the object under the effect of a biasing means, and furthermore includes a percussive mechanism including an elongated striker that is designed for the percussive element. One end of the percussive element and the associated end of the striker extend into a free space or chamber of the housing in such a way that in a state of rest of the percussive mechanism, the two ends are spaced from one another by a distance that is a function of the available percussive energy.
This apparatus is inventively characterized in that the percussive element has an essentially rectilinear cylindrical configuration, and in that that end of the striker that projects out of the percussive mechanism and is remote from the percussive element is surrounded by a balancing or equalization chamber that communicates with the free space in the housing and is subjected to a pressure that corresponds essentially to the process pressure.
The connection or communication of the free space with the balancing chamber can be achieved by a connecting line that is disposed outside of the housing, or can be achieved by at least one balancing channe
REFERENCES:
patent: 4457361 (1984-07-01), Premel et al.
patent: 4595048 (1986-06-01), Pollak et al.
Rottlander Ulrich
Thones Gustav
El-Arini Zeinab
L. & C. Steinmuller GmbH
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