CN201042701Y - Agricultural conical centrifugal fan - Google Patents

Abstract

The utility model provides an agricultural conical centrifugal fan used with a full-feed rice-wheat combined harvester to clean grains. The utility model is designed to overcome the disadvantage of the prior art that the wind pressure, wind speed and wind rate at the fan outlet are equal, resulting in small wind pressure, speed and rate in the position where the cleaning capacity is large and poor cleaning effect. The agricultural conical centrifugal fan has simple structure, reliable operation, and difference in impeller semi-diameter in axial direction of the fan. The utility model comprises an impeller, a fan shell, a rotating shaft, spokes, a secondary impeller, a secondary fan shell, and a vibrating screen, wherein the conical centrifugal fan runs based on air intake at two lateral sides, the impeller comprises the blade spokes and fan blades, the plurality of fan blades different in length are individually fixed on the rotating shaft by the spokes and screws, the fan shell is coupled with the secondary fan shell, the fan shell is matched with the impeller, and the fan shell and the secondary fan shell are both fixed on a frame.

Description

Agricultural conical centrifugal fan

technical field

The utility model belongs to the technical field of agricultural machinery, in particular to an agricultural conical centrifugal blower used for grain cleaning on a full-fed rice-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 utility model aims at the outlet air pressure, wind speed and air volume of the above-mentioned centrifugal fan used in the existing centrifugal fan used for full-feeding rice and wheat combine harvesters. In the position where there are few objects to be cleaned, the air volume, wind pressure and wind speed are too high, which not only increases the cleaning loss, but also wastes wind energy and increases the shortage of energy consumption. It provides a simple structure and reliable operation. , agricultural conical centrifugal fans with different impeller radii along the fan axis.

The technical solution adopted by the utility model agricultural conical centrifugal fan is completed in the following manner: the agricultural conical centrifugal fan includes an impeller, a fan casing, a rotating shaft, spokes, a secondary impeller, a secondary fan casing, and a vibrating screen. Among them, the agricultural conical centrifugal fan adopts double-side air intake, and the impeller and secondary impeller are composed of blade spokes and fan blades; several fan blades with different lengths are respectively fixed on the left and right sides of the rotating shaft through spokes and bolts; The 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; There are left air inlet, middle air inlet and right air inlet on the left, middle and right respectively, and an air outlet is provided on the fan; The power is driven through the sprocket.

Compared with the existing centrifugal fan used for full-feeding rice and wheat combine harvesters, the utility model has the characteristics of simple structure, reliable operation, and different impeller radii along the fan shaft direction. In addition, the utility model does not need to change the whole Feeding the fan installation position and fan shaft size of the rice and wheat combine harvester, the manufacturing cost does not increase much.

Description of drawings

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

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

Figure 3 is a schematic diagram of the structure of the vibrating screen

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

Detailed ways

Below with reference to accompanying drawing, the utility model is further described by embodiment.

With reference to accompanying drawing 1 and accompanying drawing 4, a kind of agricultural conical centrifugal blower fan that is used for grain cleaning on the full-feed rice and 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 casing 11, vibrating screen 16, wherein the agricultural conical centrifugal fan adopts double-side air intake, and impeller 3 is composed of blade spoke 8 and fan blade 4, and the secondary The stage impeller 9 is composed of blade spokes 8 and fan blades 10, and several fan blades 4 with different lengths and several fan blades 10 with different lengths are respectively fixed on the left and right sides of the rotating shaft 6 by the spokes 8 and bolts 14; 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; the left air inlet 2, the middle air inlet 7, and the right air inlet 12 are respectively arranged on the left side, the middle, and the right side of the fan, and an air outlet 15 is arranged on the fan; 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 fan blade 4 and the 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 protruding objects 17 are removed. Clear. The large head of the fan has a large wind 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 4 and the fan blade 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, and V ₂ helps the mixture to carry out The horizontal surface is evenly distributed, so as to improve the cleaning quality; the air volume, wind pressure and wind speed of the conical fan gradually decrease with the reduction of the blade diameter from the large head to the small head, so that the uniform distribution of the airflow _V2 becomes possible, and the other function of the fan is One end is the conical small end, 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 (2)

1. An agricultural conical centrifugal fan is characterized in that the fan comprises impeller, blower casing, rotating shaft, spokes, secondary impeller, secondary blower casing, vibrating screen, wherein impeller and secondary impeller are made of blade spokes and Several fan blades of different lengths are respectively fixed on the left and right sides of the shaft through spokes and bolts. The fan casing and the secondary fan casing are connected together. The fan casing is matched with the impeller. The secondary fan The casing is matched with the secondary impeller, and the fan casing and the secondary fan casing are fixed on the frame. There are left air inlet, middle air inlet, and right air inlet on the left, middle, and right sides of the fan respectively. There is an air outlet on the top, and the rotating shaft is fixed on the frame through bearings. 2. The agricultural conical centrifugal fan according to claim 1, characterized in that a sprocket is installed at one end of the rotating shaft.

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