Device for measurement of a material mass flow including a flow measuring device

1. Device for measuring the mass flow, particularly of a bulk material flow, in accordance with the Coriolis measuring principle, which device comprises an impeller wheel ( 2 ), which is driven by a motor ( 5 ) at constant speed and onto which the material flow ( 10 ) is dispensed and deflected radially and the drive torque is measured by means of a force-measuring device ( 7 ), wherein a drive shaft ( 3 ), which supports the impeller wheel ( 2 ), is mounted rotatably in a bearing sleeve ( 4 ) and is enclosed coaxially by the same and protrudes into the impeller wheel housing chamber ( 8 ), wherein the bearing sleeve ( 4 ) is mounted rotatably in a stationary drive housing part ( 9 ) and is driven at a speed, which corresponds to that of the drive shaft ( 3 ), said device being characterized in that the force-measuring device ( 7 ) is disposed between the drive shaft ( 3 ) and the bearing sleeve ( 4 ), wherein a force-receiving part ( 13 ) of the force-measuring device ( 7 ) is fixed to a part disposed in an interior zone ( 11 ) of the bearing sleeve ( 4 ) and that the drive shaft ( 3 ) is supported on a force-inducing part ( 12 ) by means of a drive means ( 14 ) spaced apart from the rotation point and the drive torque between the bearing sleeve ( 4 ) and the drive shaft ( 3 ) is detected.

2. Device for measuring a mass flow according to claim 1 , characterized in that the force-measuring device ( 7 ) is disposed inside the bearing sleeve ( 4 ) or inside a hollow body connected to the bearing sleeve ( 4 ).

3. Device for measuring a mass flow according to claim 1 , characterized in that the force-measuring device ( 7 ) is designed as a bending beam transducer, as a load cell of rotational symmetry or as a torque sensor.

4. Device for measuring a mass flow according to claim 1 , characterized in that the force-measuring device ( 7 ) is disposed in such a way between the drive shaft ( 3 ) and the bearing sleeve ( 4 ) that it ( 7 ) detects the drive torque applied by the bearing sleeve ( 4 ).

5. Device for measuring a mass flow according to claim 1 , characterized in that the force-measuring device ( 7 ) is connected to a telemetric device ( 15 ) which comprises a transmitting device ( 16 ) disposed on the bearing sleeve ( 4 ) and a receiving device ( 17 ) disposed on the stationary drive housing part ( 9 ), by means of which ( 16 , 17 ) at least the detected measurement signals can be transmitted.

6. Device for measuring a mass flow according to claim 5 , characterized in that the transmitting device ( 16 ) and the receiving device ( 17 ) contain inductors, which are disposed in such a way relative to one another that it is possible to transmit both the measurement signals as well as the supply voltage for the force-measuring device ( 7 ) by means of the inductive coupling of said inductors.

7. Device for measuring a mass flow according to claim 1 , characterized in that the bearing sleeve ( 4 ) is connected to a motor ( 5 ) by means of a driving device ( 19 , 20 , 28 ), wherein the motor ( 5 ) is disposed sideways next to or directly below the bearing sleeve ( 4 ).

8. Device for measuring a mass flow according to claim 7 , characterized in that the driving device ( 19 , 20 , 28 ) comprises a drive wheel ( 19 ), which is fixed on the bearing sleeve ( 4 ) and which is connected by means of a belt drive ( 20 ), chain drive or a gear wheel drive to the laterally disposed electric motor ( 5 ), which serves for driving the impeller wheel ( 2 ).

9. Device for measuring a mass flow according to claim 1 , characterized in that the bearing sleeve ( 4 ) is mounted rotatably in the stationary drive housing part ( 9 ) and protrudes into the impeller wheel housing ( 8 ) and rotates synchronously at the constant speed of the impeller wheel.

10. Device for measuring a mass flow according to claim 9 , characterized in that the bearing sleeve ( 4 ) is mounted radially and axially in the drive housing part ( 9 ) by means of bearings, particularly by means of ball bearings or taper roller bearing ( 21 ).

11. Device for measuring a mass flow according to claim 10 , characterized in that the drive shaft ( 3 ) is mounted by means of a radial bearing ( 22 ), particularly by means of a slide bearing, ball bearing, air bearing or a cruciform spring element in relation to the bearing sleeve ( 4 ).

12. Device for measuring a mass flow according to claim 11 , characterized in that the drive shaft ( 3 ) is mounted axially in relation to the bearing sleeve ( 4 ) by means of a central axial bearing ( 23 ), particularly by means of a ball bearing or a conical bearing.

13. Device for measuring a mass flow according to claim 1 , characterized in that the drive shaft ( 3 ) supporting the impeller wheel ( 2 ) is mounted rotatably in the bearing sleeve ( 4 ), wherein the drive shaft ( 3 ) is supported in drive terms on a force-measuring device ( 7 ) in such a way that the drive shaft ( 3 ) rotates at the same speed by means of the driven bearing sleeve ( 4 ).

14. Device for measuring a mass flow according to claim 1 , characterized in that the stationary drive housing part ( 9 ) is designed to be cylindrical in the axial direction and is surrounded by a downwardly conically tapering impeller housing ( 1 ) and comprises entrance openings ( 6 ) and discharge openings ( 24 ), which are located axially on top of each other in the straight direction of the flow, wherein the drive motor ( 5 ) is disposed sideways next to the drive housing part ( 9 ) outside of the impeller wheel housing ( 1 ) and thus has a flat construction.

15. Device for measuring a mass flow according to claim 1 , characterized in that the force-measuring device ( 7 ) is connected to an evaluating device, which calculates the feed advance rate and/or the feeding quantity of the mass flow from the detected measurement signals, the geometric dimensions and other physical parameters.

16. A device for measuring the mass flow rate of a bulk material flow, said device comprising an impeller wheel within an impeller wheel housing and upon which material flow is received and deflected radially,

a drive shaft supporting said impeller wheel and rotatably mounted within, and coaxially enclosed by, a bearing sleeve,

a motor for driving said drive shaft and impeller at a constant speed,

a stationary drive housing, said bearing sleeve rotatably mounted within said stationary drive housing, wherein said bearing sleeve is driven at a speed corresponding to the speed of said drive shaft, and

a force-measuring device disposed between said drive shaft and said bearing sleeve for detecting a drive torque, said force measuring device including a force-receiving portion fixed to said bearing sleeve and a force-inducing portion connected to said drive shaft through a drive means that is spaced radially from the drive shaft, wherein said force-measuring device detects the drive torque between said drive shaft and said bearing sleeve.