Pneumatic conveyor device for granular material and agricultural distributing machine
A pneumatic conveying device for conveying granular material, in particular seeds and/or fertilizer, includes at least one blower with at least one outlet, to which the at least one main air supply line is connected, into which flows an air flow generated by the blower. The at least one main air supply line leads into an air inlet of an air distribution device for controlling the volumetric air flow. The air distribution device has an even number of air outlets, to which the respective one connecting line is connected, to which a metering device for supplying the granular material is connected. The air distribution device is embodied as a cylindrical housing with a rotary slide valve arranged therein, which is equipped for changing an outlet cross-section of the air outlets in order to manipulate the supplied volumetric air flow for transporting the granular material coming from the respective metering device.
1 . A pneumatic conveying device ( 4 ) for conveying a granular material, comprising:
a blower ( 5 ) having an outlet ( 10 );
a main air supply line ( 11 ) connected to the outlet ( 10 ) and configured to receive a volumetric air flow ( 12 ) generated by the blower ( 5 );
an air distribution device ( 14 ) having a cylindrical housing ( 17 ); and
a rotary slide valve ( 18 ) arranged in the cylindrical housing ( 17 ),
wherein the main air supply line ( 11 ) leads into an air inlet ( 13 ) of the cylindrical housing ( 17 ),
wherein the cylindrical housing ( 17 ) has a number of air outlets ( 15 ),
wherein the number of the air outlets ( 15 ) is even or divisible by three,
wherein a connecting line (L 1 , L 2 , L 3 , . . . L 8 ) is connected to each of the air outlets ( 15 ),
wherein a metering device ( 16 ) for supplying the granular material is connected to each connecting line (L 1 , L 2 , L 3 , . . . L 8 ),
wherein the rotary slide valve ( 18 ) includes a plurality of openings ( 25 ) for changing an outlet cross-section of the air outlets ( 15 ) in order to manipulate the volumetric air flow ( 12 ) for transporting the granular material coming from the respective metering device ( 16 ).
2 . The pneumatic conveying device ( 4 ) as in claim 1 ,
wherein the pneumatic conveying device ( 4 ) is configured to convey seeds and/or fertilizer.
3 . The pneumatic conveying device ( 4 ) according to claim 1 ,
wherein an actuator ( 19 ) is arranged on the rotary slide valve ( 18 ), and
wherein the rotary slide valve ( 18 ) is manually or automatically actuatable via the actuator ( 19 ).
4 . The pneumatic conveying device ( 4 ) according to claim 1 ,
wherein the rotary slide valve ( 18 ) has an arcuate section ( 24 ) pivotable about a longitudinal axis ( 20 ) of the housing ( 17 ),
wherein the openings ( 25 ) extend in a circumferential direction of the arcuate section ( 24 ) in sections, and
wherein the openings ( 25 ) interact with the air outlets ( 15 ) of the housing ( 17 ) depending on a set pivot position of the arcuate section ( 24 ).
5 . The pneumatic conveying device ( 4 ) according to claim 1 ,
wherein the rotary slide valve ( 18 ) is adjustable in discrete steps or continuously.
6 . The pneumatic conveying device ( 4 ) according to claim 1 ,
wherein the housing ( 17 ) has a circular-cylindrical shape.
7 . The pneumatic conveying device ( 4 ) according to claim 4 ,
wherein the openings ( 25 ) in the circumferential direction of the arcuate section ( 24 ) have an extent (L) which corresponds to at least twice a diameter (D) of the outlet cross-section of the air outlets ( 15 ).
8 . The pneumatic conveying device ( 4 ) according to claim 4 ,
wherein the openings ( 25 ) have a width (B) in an axial direction, and
wherein the width (B) corresponds to or exceeds a diameter (D) of the outlet cross-section of the air outlets ( 15 ) or is less than the diameter (D) of the outlet cross-section.
9 . The pneumatic conveying device ( 4 ) according to claim 4 ,
wherein the openings ( 25 ) in a vicinity of the main air supply line ( 11 ) have a smaller opening cross-section or a smaller width (B) than the openings ( 25 ) further distant from the main air supply line ( 11 ).
10 . The pneumatic conveying device ( 4 ) according to claim 4 ,
wherein the openings ( 25 ) have a substantially elliptical opening cross-section.
11 . The pneumatic conveying device ( 4 ) according to claim 4 ,
wherein the openings ( 25 ), seen in the circumferential direction of the rotary slide valve ( 18 ), are arranged with an alternating offset in the circumferential direction relative to one another.
12 . The pneumatic conveying device ( 4 ) according to claim 1 ,
wherein the air outlets ( 15 ) are arranged axially parallel to a longitudinal axis ( 20 ) of the housing ( 17 ) next to one another on the housing ( 17 ).
13 . The pneumatic conveying device ( 4 ) according to claim 11 ,
wherein the main air supply line ( 11 ) is arranged located opposite the air outlets ( 15 ) on the housing ( 17 ) or coaxially to the housing ( 17 ).
14 . The pneumatic conveying device ( 4 ) according to claim 11 ,
wherein the air outlets ( 15 ) are arranged in pairs next to one another or in a group of three,
wherein a distance of the air outlets ( 15 ) among at least one pair or one group is smaller than a distance to an adjacent pair or group of air outlets ( 15 ).
15 . The pneumatic conveying device ( 4 ) according to claim 14 ,
wherein two metering devices ( 16 ) each are arranged downstream in a conveying direction (FR) of each pair of air outlets ( 15 ), and
wherein the two metering devices ( 16 ) are connectible to both connecting lines (L 1 , L 2 , L 3 , . . . L 8 ) assigned to respective air outlets ( 15 ) to optionally supply the granular material of one of the two metering devices ( 16 ) or both of the two metering devices ( 16 ) to one connecting line (L 1 , L 2 , L 3 , . . . L 8 ) or both connecting lines (L 1 , L 2 , L 3 , . . . L 8 ).
16 . The pneumatic conveying device ( 4 ) according to claim 15 ,
wherein each metering device ( 16 ) comprises a change-over element actuatable manually or by an actuator, and
wherein the change-over element connects or disconnects the respective metering device ( 16 ) to/from one or both connecting lines (L 1 , L 2 , L 3 , . . . L 8 ).
17 . An agricultural distribution machine ( 2 ) for conveying granular material taken from at least one storage container ( 6 ), comprising
a pneumatic conveying device ( 4 ),
wherein the pneumatic conveying device ( 4 ) comprises
a blower ( 5 ) having an outlet ( 10 );
a main air supply line ( 11 ) connected to the outlet ( 10 ) and configured to receive a volumetric air flow ( 12 ) generated by the blower ( 5 );
an air distribution device ( 14 ) having a cylindrical housing ( 17 ); and
a rotary slide valve ( 18 ) arranged in the cylindrical housing ( 17 ),
wherein the main air supply line ( 11 ) leads into an air inlet ( 13 ) of the cylindrical housing ( 17 ),
wherein the cylindrical housing ( 17 ) has a number of air outlets ( 15 ),
wherein the number of the air outlets ( 15 ) is even or divisible by three,
wherein a connecting line (L 1 , L 2 , L 3 , . . . L 8 ) is connected to each of the air outlets ( 15 ),
wherein a metering device ( 16 ) for supplying the granular material is connected to each connecting line (L 1 , L 2 , L 3 , . . . L 8 ),
wherein the rotary slide valve ( 18 ) includes a plurality of openings ( 25 ) for changing an outlet cross-section of the air outlets ( 15 ) in order to manipulate the volumetric air flow ( 12 ) for transporting the granular material coming from the respective metering device ( 16 ).