CN101138761B - Conical Centrifugal Fan - Google Patents

Abstract

The invention relates to a conical centrifugal blower used for grain cleaning on a full-feed rice and wheat combine harvester. The present invention aims at the outlet wind pressure, wind speed and air volume of the existing centrifugal fan used in full-feeding rice and wheat combine harvesters. In order to overcome all the shortcomings, a conical centrifugal fan with simple structure, reliable operation and different impeller radii along the fan shaft direction is provided. The invention includes impeller, fan casing, rotating shaft, spokes, secondary impeller, secondary fan casing, vibrating screen, wherein, the conical centrifugal fan adopts double-side air intake, and the impeller is composed of blade spokes and fan blades. Fan blades with different lengths are respectively fixed on the rotating shaft through spokes and bolts, the fan casing and the secondary fan casing are connected together, the fan casing and the impeller are matched, and the fan casing and the secondary fan casing are fixed on the machine. on the shelf.

Description

Conical Centrifugal Fan

technical field

The invention belongs to the technical field of agricultural machinery, in particular to a conical centrifugal fan used for grain cleaning on a full-feed rice and wheat combine harvester.

Background technique

The horizontal axial flow threshing and separation device is currently used on the full-feeding rice and wheat combine harvester. The device is composed of a threshing drum and a grid-type concave screen. The axis of the pulling drum is perpendicular to the forward direction of the machine. When the machine is working, the crops are radially fed from the right end of the axial flow drum, and then move to the left end while threshing in the high-speed rotating threshing drum. Under the action of centrifugal force, the shells and short stems pass through the grating concave plate screen placed under the axial flow drum, and fall on the vibrating screen below along the axis of the drum, and then pass through the centrifugal screen placed under the front and bottom of the vibrating screen. Under the combined action of the fan airflow, the prolapsed matter is cleaned, the sundries are blown out of the machine, and the grains are collected and sent to the grain collection box. The experiment shows that the crops enter from the right end of the axial flow drum and are discharged from the left end, and the amount of prolapsed matter falling on the vibrating screen is not equal along the axial direction of the axial flow drum. The right end of the entry end is the most, and the left end of the discharge end is the least, basically linear Decrease, so the cleaning load on the vibrating screen is uneven. The centrifugal fan is the core working part of the cleaning device. The existing centrifugal fan used on the full-feed rice and wheat combine harvester has the fan shaft parallel to the axis of the axial flow drum. The width of the fan is equal to that of the vibrating screen, and the air outlet faces The entire screen surface, within the entire width range of the fan, the structural parameters such as the radius of the fan blades and the working parameters such as the rotating speed are the same. it's the same. But the opposite side of the cleaning object is different, so the air volume, wind pressure and wind speed in the location with a lot of cleaning objects are relatively small, and the cleaning is endless, while the location with few cleaning objects is too large, which not only increases the cleaning loss, but also increases the cleaning loss. Also wasted wind energy, increased energy consumption.

Contents of the invention

The present invention aims at the outlet air pressure, wind speed and air volume of the above-mentioned fan existing in the centrifugal fan used on the full-feeding rice and wheat combine harvester, which causes the air volume, wind pressure and wind speed to be too small in the position where there are many objects to be cleaned. In the position where there are few objects to be cleaned, the air volume, wind pressure and wind speed are too large, which not only increases the cleaning loss, but also wastes wind energy and increases the shortage of energy consumption. It provides a simple structure, reliable operation, Conical centrifugal fans with different impeller radii along the fan axis.

The technical scheme adopted by the conical centrifugal blower of the present invention is accomplished in the following manner: the conical centrifugal blower comprises an impeller, a blower casing, a rotating shaft, spokes, a secondary impeller, a secondary blower casing, a vibrating screen, an impeller and a secondary The stage impeller is composed of spokes and fan blades; among them, the conical centrifugal fan has a large head and a small head, and the diameter of the blades gradually decreases from the large head to the small head. Side; the fan casing and the secondary fan casing are connected together, the fan casing is matched with the impeller, the secondary fan casing is matched with the secondary impeller, and the fan casing and the secondary fan casing are fixed on the frame; The conical centrifugal fan adopts double-sided air intake, with air inlet 1, air inlet 2, and air inlet 3 on the left, middle, and right sides of the fan, and an air outlet on the fan; the shaft is fixed on the On the frame, a sprocket is installed at one end of the rotating shaft, and the fan is driven by external power through the sprocket.

Compared with the existing centrifugal fan used on the full-feed rice and wheat combine harvester, the present invention has the characteristics of simple structure, reliable operation, and different impeller radii along the fan shaft direction. In addition, the application of the present invention does not need to change the full-feed The installation position of the fan of the rice and wheat combine harvester and the size of the fan shaft will not increase the manufacturing cost much.

Description of drawings

Figure 1 is a schematic structural view of a conical centrifugal fan.

Fig. 2 is a sectional view along A-A of Fig. 1 .

Figure 3 is a structural schematic diagram of the vibrating screen cleaning mechanism

FIG. 4 is a top view of FIG. 3 .

Detailed ways

The present invention will be further described through the embodiments below with reference to the accompanying drawings.

With reference to accompanying drawing 1 and accompanying drawing 4, a kind of conical type centrifugal blower fan that is used for grain cleaning on the fully fed rice-wheat combine harvester, this blower fan adopts two-stage impeller parallel structure, and it comprises impeller 3, blower housing 5, Rotating shaft 6, spokes 8, secondary impeller 9, secondary fan housing 11, vibrating screen 16, wherein the conical centrifugal fan adopts double side air intake, impeller 3 is composed of spoke 8 and fan blade 1, and the secondary impeller 9 is made up of spoke 8 and fan blade 2 10, and fan blade 1 4 of several sheet lengths and fan blade 2 10 of several sheet lengths are fixed on the left and right sides of rotating shaft 6 by spoke 8 and bolt 14 respectively; The casing 5 is connected with the secondary fan casing 11, the fan casing 5 is matched with the impeller 3, the secondary fan casing 11 is matched with the secondary impeller 9, the fan casing 5 and the secondary fan casing 11 are fixed on On the frame; on the left, middle, and right sides of the fan, there are air inlet one 2, air inlet two 7, and air inlet three 12, and the fan is provided with an air outlet 15; the rotating shaft 6 is fixed on the frame through the bearing 1 Above, a sprocket 13 is installed at one end of the rotating shaft 6, and the blower fan is driven by the external power through the sprocket 13.

When the machine is working, the external power is driven by the sprocket 13, the first fan blade 4 and the second fan blade 10 rotate at a high speed, and the wind blows from the air outlet 15 to the vibrating screen 16, and under the joint action of the wind force and the vibrating screen 16, the prolapsed matter 17 were cleared. The large head of the fan has a large air pressure, air volume, and wind speed, which is suitable for the separation and cleaning of accumulated protruding objects 17. Because the blowing direction of the airflow V is perpendicular to the fan blade one 4 and the fan blade two 10, it can be decomposed into V ₁ and V ₂ , V ₁ can blow out the chaff and impurities in the extract 17 vertically outside the machine, and V ₂ helps The mixture is uniformly distributed across the surface to improve the cleaning quality; the air volume, pressure and wind speed of the conical fan gradually decrease with the reduction of the diameter of the blades from the large head to the small head, so that the uniform distribution of the airflow _V2 becomes possible. The other end of the cone is the small head, which corresponds to the end with less protruding objects 17, the smaller wind pressure, air volume and wind speed can meet the cleaning requirements, and also save energy consumption. Therefore, compared with the traditional cylindrical fan, the conical fan has the characteristics of evenly distributing the load on the vibrating screen surface, improving the cleaning quality and rationally using the wind to save energy.

Claims (3)

1. taper cone type centrifugal fan, it is characterized in that this blower fan adopts twin-stage impeller parallel-connection structure, it comprises impeller (3), Fan casing (5), rotating shaft (6), spoke (8), vibratory sieve (16), impeller (3) is made up of spoke (8) and fan blade one (4), wherein taper cone type centrifugal fan has major part and microcephaly, blade diameter dwindles gradually from major part to the microcephaly, the fan blade one (4) that some leaf length do not wait is fixed in the rotating shaft (6) by spoke (8) and bolt (14), Fan casing (5) matches with impeller (3), Fan casing (5) is fixed on the frame, taper cone type centrifugal fan adopts the two sided air intake, on blower fan, be respectively equipped with air inlet one (2) and air inlet two (7), be provided with air outlet (15) on blower fan, rotating shaft (6) is fixed on the frame by bearing (1).

2. taper cone type centrifugal fan according to claim 1 is characterized in that at an end of rotating shaft (6) sprocket wheel (13) being housed, and blower fan is driven by sprocket wheel (13) by outer power.

3. taper cone type centrifugal fan according to claim 1 and 2, it is characterized in that on this blower fan, also comprising secondary impeller (9) and secondary Fan casing (11), secondary impeller (9) is made up of spoke (8) and fan blade two (10), the fan blade two (10) that fan blade one (4) and the some leaf length that some leaf length do not wait or not is separately fixed at the left and right sides of rotating shaft (6) by spoke (8) and bolt (14), Fan casing (5) is linked together with secondary Fan casing (11), (9 match secondary Fan casing (11) with secondary impeller, secondary Fan casing (11) is fixed on the frame, in the left side of blower fan, middle, the right side is respectively equipped with air inlet one (2), air inlet two (7), air inlet three (12).

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