Rotary expansible chamber devices – Interengaging rotating members – Non-parallel axis
Patent
1992-11-25
1995-03-07
Vrablik, John J.
Rotary expansible chamber devices
Interengaging rotating members
Non-parallel axis
418196, F04C 304
Patent
active
053952251
DESCRIPTION:
BRIEF SUMMARY
The present invention refers to a screw pump of the type which comprises a rotatable screw in a house, the threads of which are in engagement with a rotatable sealing device.
BACKGROUND OF THE INVENTION
Industrial waste products, such as waste chemicals, waste oil and so on are often of very high viscosity and heavily contaminated with wearing particles in varying size. When pumping these media it is important to use a low speed pump as possible, which can swallow large particles and to give the high viscous medium good time to flow up.
Today among others so called modified archimedes screw pumps are used, with a multiple toothed radially positioned sealing and pressure build-up disc, which is in engagement with the screw. An example on such screw pump is described in SE-B-8101863. Because of the geometry of the sealing disc the meshing part of the screw can not simply be machined, which implies bad sealing and high wear on included parts. The displacement is limited by screw flanks during one screw turn and the cylinder wall and two successive teeth on the sealing disc. In practice the whole screw diameter cannot be used, since the screw must have a supporting center shaft, which steals a part of the displacement of the pump. Moreover the relatively large sealing disc demands large space, which results in the pump being bulky.
OBJECT OF THE INVENTION AND MOST ESSENTIAL FEATURES
The object of the invention is to provide a screw pump of the type stated by way of introduction, the pump screw of which can be machined, which has a very large displacement, which can swallow large particles in respect to its diameter, which has small build in dimensions and which is characterized in low wear between the pump screw and the sealing discs, which results in long life and long periods between the services. Moreover a change of the wearing parts such as the gaskets of the sealing discs should be possible to be carried out rapidly and in some simple operations. These tasks have been solved by the screw area of the screw, that is the thread groove and the thread root is generated by a generatrix, which is a part of a circular arc, the circle of which can rotate around an eccentric rotation axis, when the generatrix rotates around the axis of the screw and is moved along this with a velocity which is proportional to the rotation velocity of the screw, and that the sealing device comprises at least one circular disc, the eccentric rotation axis of which, is arranged crosswise towards the axis of the screw, coincides with the rotation axis of the generatrix.
DESCRIPTION OF THE DRAWINGS
The invention will be described in closer detail with reference to the drawings, which describe an embodiment.
FIG. 1 shows the screw pump according to the invention in a lateral view.
FIG. 2 shows a section along the line II--II in FIG. 1 and with the sealing discs shown in an initial position.
FIG. 3 shows a view analogous with FIG. 2 of the screw pump with the sealing discs rotated 90.degree. relatively the sealing discs in FIG. 2.
FIG. 4 is a section along the line IV--IV in FIG. 3.
FIG. 5 shows an end view of the screw pump according to the invention with the output opening.
FIG. 6 is a fragmentary side elevation view of a rotatable screw and sealing device of the present invention illustrating the attitude of parts thereof during the operation thereof.
FIG. 7 is a cross-sectional view of the rotatable screw and sealing device as shown in FIG. 6 taken along the section line in FIG. 6.
FIG. 8 is a fragmentary side elevation view of the rotatable screw and sealing device of the present invention showing attitude of parts thereof at a different time.
FIG. 9 is a cross-sectional view of the rotatable screw and sealing device as shown in FIG. 8 taken along the section line in FIG. 8.
FIG. 10 is a fragmentary side elevation view of the rotatable screw and sealing device showing the attitude of parts thereof at still another time in the operation of the device.
FIG. 11 is a cross-sectional view of the rotatable screw and sealing devic
REFERENCES:
patent: 2413209 (1946-12-01), Bejeuhr
patent: 3726616 (1973-04-01), Powers
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