SU1064906A1 - Grain combine harvester cleaning unit - Google Patents

Description

2- Cleaning according to claim 1, characterized in that the shape of the fan wheel of the fan wheel is made according to dependencies:

D, / I 0,62 - 0,68 and

IJ BX + C, + s}

 internal blade diameter

wheels, m;

D is the outer diameter of the wheel blade, m;

X is the axis of coordinates coinciding in direction with the blade chord;

y is the height of the blade profile at a distance from the origin of coordinates coinciding with the exit edge of the blade, m;

, 72 - 0.76;

C (-0.015) - (-0,, 025);

Qr (-0,0008) .- (-0.001.),

The invention relates to the field of agricultural engineering and can be used in a combine harvester.

It is known to clean a combine harvester containing a sieve, auger and a diametrical fan. with housing and impeller left rotation ij.

In the known device there is an accumulation of impurities in the lower part of the housing, which worsens the characteristics of the fan.

Also known is the cleaning of a combine harvester containing a sieve, a grain auger, a diametric blower for blows with the impeller of the right rotation, a housing with an inlet window and an outlet nozzle, and also a visor of variable length 2j installed in the lower part of the outlet nozzle;

A disadvantage of the known cleaning is that the rectilinear form of the visor does not allow for the uniform blowing of the sieves, as a result of which the normal cleaning operation is not ensured, i.e. the quality of the separating process deteriorates.

The purpose of the invention is to increase the efficiency of the operation. This goal is achieved by the fact that the visor is made rotatable by means of a horizontal hinge, located in the middle part of the visor, bent towards the entrance window and with a section increasing towards the hinge of the turn.

In addition, the shape of the fan wheel blade is made according to dependencies:

DI / D 0.62 - 0.68 and

II + a ,,

where iJi is the internal diameter of the wheel blade, m;

1) - outer diameter of the blade

wheels, m;

X is an axis of coordinates coinciding in the direction from the chordoid of the scapula;

y is the height of the blade profile at a distance X from the origin of coordinates that coincides with the exit edge of the blade, m;

B o, 7 2 - O, T6; C - (-0.01.5) - - (- 0.025); Q (-0,0008) - (- 0.001), FIG. 1 schematically depicts the proposed cleaning of a combine harvester; in FIG. 2 - a blade: an impeller and a schematic diagram of its construction. Cleaning a combine harvester contains a sieve 1, a grain auger

2 with a housing 3, and a diameter fan 4 with an impeller 5 of right rotation. The latter provides the location of the opening of the spiral casing 6 upward and thereby

prevents impurities from getting stuck between the casing 6 and the impeller 5, the housing 6 of the fan 4 is made of shell 7, - The swivel 9 around the horizontal hinge 8, the visor 9 is bent towards the inlet 10 and thickens towards the output edge 11 This design of the visor 9 allows ensure the optimal shape of it since

5, the curvature of the outer side of the visor 9 approximately corresponds to the curvature of the streamline, the envelope of the cyclone vortex, and allows the flow to naturally expand.

0 and uniformly fill the entire space of the output window; a,. The hinge 8 is located in the middle part of the shield 9. Resolving the radius R of the bend of the inner surface of the housing to

5 to the outer diameter of the blade 12 of the impeller 5 is in the range of 20 to 0.32, which minimizes leakage losses

Claims (2)

1. CLEANING OF THE GRAIN 'COMBINE, containing sieves, grain auger, diametral fan for blowing sieves with a right-hand impeller, having a housing with an inlet window and an outlet pat-off, as well as a visor of variable cross-sectional length, installed at the bottom of the outlet nozzle, about Particularly, in order to increase work efficiency, the visor is made rotatable by means of a horizontal hinge located in the middle part of the visor, curved towards the entrance window and increasing in direction th to the hinge turning section | m- 2- Cleaning in accordance with π, 1, with the fact that the shape of the fan wheel blade is made according to the dependencies: ΰ </ Ώ = 0,62 - 0,68 and C - Βχ + C _X + C where χ t D / - inner diameter of the blade wheel, m.; D is the outer diameter of the wheel blades, m; • X is the coordinate axis coinciding in direction with the chord of the blade; y is the height of the blade profile at a distance X from the origin, coinciding with the outlet edge of the blade, m; B = 0.72 - 0.76; C "(- 0.015) - (-0, .025); ¢: (- 0,0008) - (-0,001.),