Grinder housing for a pressure chamber grinder

Details Grinder housing for a pressure chamber grinder Grinder housing for a pressure chamber grinder

1987-04-30

1988-09-06

Rosenbaum, Mark

Solid material comminution or disintegration

Apparatus

Including means applying fluid to material

241 81, B02C 1906

Patent

active

047687215

DESCRIPTION:

BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION

The present invention is concerned with the grinder housing of a pressure chamber grinder, in which the grinder housing comprises a substantially cylindrical outer mantle, end walls, preferably two accelerating nozzles passing radially through the outer mantle, between which said nozzles there is an obtuse angle, as well as a discharge opening made into one of the end walls for the ground product.
In the pressure chamber grinder apparatuses known in prior art, the discharge ends of the accelerating nozzles extend into the interior of the grinding chamber, where the material-gas jets rushing out of the nozzles collide against each other at very high speeds so that the material particles in the jets are ground. In the main grinding chamber in the prior-art pressure chamber grinders, the material particles are, in principle, subjected to the grinding effect only once. In the case of materials that are difficult to grind, no satisfactory grinding result can be obtained with one passage through the grinder, but the discharge opening of the grinding chamber is directly connected to a classifier, whose discharge opening for the coarse fraction is directly connected to the grinding chamber, to the collision zone of the material-gas jets.
The solution mentioned above is not fully successful, for, in order that the best possible grinding result should be achieved, the solids content in the material-gas jets colliding against each other must be kept relatively high, whereas, in order that a satisfactory classification result should be obtained, a very large excess quantity of gas is required in the classifier. In order that the material particles should reach an ultrasonic speed in the accelerating nozzles, the solids content in the material-gas jets rushing through the nozzles must be kept relatively low. On the other hand, in principle, the working gas has accomplished its duty by the stage in which the material particles have been accelerated through the nozzles. It has, viz., been noticed that the working gas present in the grinding chamber has mainly a detrimental effect on the grinding process proper.
Moreover, in the grinder apparatuses known in prior art, it is not possible to control the solids contents in the material-gas jets between different stages, but a compromise must be made in the choice of the grinding conditions, which does not yield a fully satisfactory result.


SUMMARY AND OBJECT OF THE INVENTION

The object of the present invention has been to eliminate the drawbacks mentioned above, which has been achieved by means of a grinder housing which is provided with a substantially cylindrical partition wall, which is in itself known, centrally located, and which surrounds the grinding chamber proper and is provided with an inlet opening facing the orifice of each accelerating nozzle, preferably terminating at the plane of the inner face of the outer mantle, that the annular space surrounding the partition wall is a gas removing chamber to which an exhaust duct passing through the outer mantle is connected for the removal of the excess quantity of working gas discharged out of the solids-working-gas jets of the accelerating nozzles into the gas removing chamber.
By means of this solution, it is possible to control the solids contents in the material-gas flows before they rush into the grinding chamber, where the grinding takes place in a highly efficient manner, because in the grinding chamber there are no working-gas flows interfering with the grinding. Moreover, in this grinding chamber of new type, the grinding takes place in two stages, so that the grinding result is considerably more uniform than in the grinder apparatuses used in prior art. The first grinding stage takes place in the middle part of the grinding chamber, where the material particles rushing out of the different accelerating nozzles collide against each other at ultrasonic speed, and the second grinding stage takes place when the material particles that have passed through this first collisi

REFERENCES:
patent: 2588945 (1952-03-01), Trost
patent: 3559895 (1971-02-01), Fay
patent: 4502641 (1985-03-01), Coombe

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