Harvester suction fan
The suction fan design with three evenly distributed air inlets and adjustable components addresses uneven air distribution in cross-axis flow threshing systems, improving cleaning efficiency in harvesters by ensuring uniform air flow.
Patent Information
- Application Number
- IR140050140003007727
- Authority / Receiving Office
- IR · IR
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2021-04-27
- Filing Date
- 2022-01-01
- Publication Date
- 2025-07-28
- Estimated Expiration
- 2042-01-01
AI Technical Summary
The existing cross-axis flow type threshing systems in harvesters suffer from uneven air distribution caused by conventional suction fans, leading to inconsistent wind effects and reduced efficiency in grain cleaning.
A suction fan design with three evenly distributed air inlets and a fan structure featuring adjustable air blocking components and fan blades, ensuring uniform air intake and distribution.
The new design achieves uniform air intake and distribution, enhancing the cleaning efficiency of harvesters by ensuring consistent air flow across the threshing and screening systems.
Smart Images
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Abstract
Description
Harvester suction fan Technical background This invention relates to the technical field of agricultural machinery, specifically the suction technology of a harvester. Background A threshing system of a Caterpillar combine may be divided into a longitudinal axis flow type threshing system and a transverse axis flow type threshing system, which are currently the main structural forms used in the market. The harvester is mainly divided internally from top to bottom into a threshing system, a screening system and a wind system. The wind system plays the role of continuously blowing air to the end of the harvester. The blown air passes through an area of falling crop grains and a mesh screen in the screening system to remove debris such as chopped grass and stubble that are lighter than the crop grains and come out of the opening at the end of the harvester to collect the crop grains with high cleanliness. In the existing cross-axis flow type cleaning system, since the inner area of a cross-axis flow type double-cylinder thresher is wide, for example, the working area of a threshing cylinder is wide. A conventional suction fan in the wind system will produce strong air at both ends and weak air in the middle, which will result in uneven air on the surface of the vibrating plate, thereby affecting the wind effect. Summary Therefore, the technical problem to be solved by this invention is to overcome the influence of the wind effect caused by the uneven air supply of a suction fan in the prior art. To this end, this invention provides a suction fan for the harvester that includes the following: Suction fan housing equipped with a cylindrical mounting hole. A fan structure that is coaxially located in the mounting cavity. A suction fan driver connected to the fan structure and adapted to move the fan structure to rotate in the mounting cavity. In which, The suction fan housing has primary air inlets, respectively formed axially at its two ends to communicate with the outside, and an air outlet formed axially on its side wall. The air outlet has a width equal to the width of the installation hole and The suction fan housing has a secondary air inlet formed circumferentially on its side wall and arranged opposite the air outlet, and in the axial direction of the suction fan housing, the second air inlet is located in the middle of the suction fan housing. Air blocking components are located on each of the first air inlets and are adapted to change the air inlet area of the first air inlet. The air blocking components are in plate-shaped structures and are slidably mounted on the exhaust fan housing. Two air blocking components are located on each of the first air inlets; one of them is located on one side away from the air outlet of the first air inlet and is adjusted to slide horizontally and block a portion of the upper half of the first air inlet. The other air blocking component is located on one side away from the air outlet of the first air inlet and is configured to slide vertically and block a portion of the lower half of the first air inlet. Strip-shaped holes are made in the air-blocking components, and the air-blocking components are bolted and fixed to the suction fan housing through the strip-shaped holes. The fan structure includes the following: A fan shaft that is coaxially located in the mounting hole and the two ends of the fan shaft are fixed on two bearing chassis respectively. A large number of holding units fixed at uniform intervals on the fan shaft. A large number of fan blades fixed on the holding units and Each of the storage units has the following: A large number of fan blade brackets that are screwed onto the fan shaft in the circumferential direction of the fan shaft, fixed and locked in order In which, the fan blades are respectively screwed and fixed on the fan blade brackets, and these brackets (2i) are enclosed to form a regular polygon, and this regular polygon is tangent from the outside to the circle of the fan shaft cross-section. The fan blade brackets are bent to form fixed sections and mounting sections. The end sections of the mounting sections are adapted to mount the fan blades, and an angle α is formed between each fixed section and each mounting section, which is the complement of the internal angle β of the regular polygon formed by encircling the fan blade brackets. A flat slot is formed in the fan shaft corresponding to each of the holding units, and one of the fan blade brackets is fixed in the flat slot. The harvester suction fan also includes a reinforcement plate welded and fixed in the flat slot, where the fan blade brackets are fixed on the upper surface of the reinforcement plate. The reinforcement plate has a thickness equal to the depth of the flat slot, and the reinforcement plate has a width in the radial direction of the fan shaft that is not greater than the diameter of the fan shaft. A large number of flat slots are formed in the fan shaft and correspond one by one to the fan blade brackets. The mounting parts of the fan blade brackets are respectively fixed in the flat slots. The technical solution of this invention has the following advantages: The harvester suction fan provided by this invention includes a suction fan housing, a fan structure and a suction fan driver. The fan structure is installed in a cylindrical installation cavity of the suction fan housing, and first air inlets communicating with the outside are respectively formed at two ends in the axial direction of the fan housing. The air outlet is formed in the side wall of the suction fan housing in the axial direction, and the width of the air outlet is equal to the width of the installation cavity. The second air inlet is formed on the side wall opposite to the air outlet of the suction fan housing in the circumferential direction and in the axial direction of the suction fan housing. The second air inlet is located in the middle of the suction fan housing. The second air inlet is formed in the middle of the suction fan housing, and together with the first air inlets at two ends of the suction fan housing, it forms three air inlets that are evenly distributed in the suction fan housing, making it more sufficient and uniform. Brief description of the shapes In order to more clearly illustrate specific embodiments of the invention or technical solutions in the prior art, the figures required to explain the specific embodiments or prior art will be briefly described below. It is clear that the figures described below are merely some of the embodiments of the invention and that other figures can be made by persons of ordinary skill in the art without any creative work. Figure 1 is a schematic structural diagram of a suction fan housing in an embodiment of the present invention. Figure 2 is a schematic structural diagram of the installation structure of an air blocking component in an embodiment of the present invention. Figure 3 is a cross-sectional view of a fan structure in an embodiment of the present invention. Figure 4 is a schematic structural diagram of a fan shaft in an embodiment of the present invention; and Figure 5 is a three-dimensional view of the fan structure in an embodiment of the present invention. Explanation of reference numbers 1. Chassis; 3f. Suction fan housing; 31f. First air inlet; 32f. Second air inlet; 33f. Air outlet; 1i. Fan shaft; 11i. Flat slot; 2i. Fan blade; 3i. Fan blade bracket; 31i. Mounting section; 32i. Fixed section 4i. Reinforcement plate; 51i. First air protection plate; 52i. Second air protection plate Description with details The technical solutions of this invention, in combination with the accompanying figures, are clearly and completely explained below, and it is clear that the described embodiments are part of the embodiments of this invention. Based on the embodiments of this invention, all other embodiments obtained by persons of ordinary skill in the art without any creative work are within the scope of protection of this invention. In describing this invention, it should be noted that the orientation or positional relationship indicated by terms such as “center,” “top,” “bottom,” “left,” “right,” “vertical,” “horizontal,” “inside,” “outside” is the orientation or positional relationship based on the accompanying figures. Such terms are merely for convenience in explaining this invention and simplifying the description and are not intended to indicate or imply that the device or part in question must be located in a particular orientation or must be constructed or operated in a particular orientation. Therefore, these terms should not be construed as a limitation on this invention. Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In explaining this invention, it should be noted that unless otherwise specified and defined, terms such as "mounted", "connected" and "connection" should be understood in their broad sense, for example, the connection can be a fixed connection, a detachable connection or an integral connection, a mechanical connection or an electrical connection, a direct or indirect connection through an intermediary and a connection between two parts. For those of ordinary skill in this art, the specific meanings of the above terms in this invention can be understood with regard to the specific circumstances. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as no conflict arises between them. Visualization 1 This embodiment provides a suction fan for a harvester. As shown in Figures 1 and 2, this embodiment includes a suction fan housing 3f, a fan structure, and a fan driver. The fan structure is installed in a cylindrical mounting hole of the fan housing 3f, and the suction fan housing 3f has first air inlets 31f formed axially at both ends thereof to communicate with the outside. The first air inlets 31f are circular air inlets formed concentrically with a cross section of the cylindrical mounting hole. The suction fan housing 3f has an air outlet 33f formed axially in a side wall thereof, and the air outlet 33f and the mounting hole are the same in width. An air guide structure may be installed on the air outlet 33f to easily guide the air to blow in a set direction. As shown in FIG. 1 , the suction fan housing 3f has a secondary air inlet 32f formed peripherally in its side wall and positioned so as to be opposite to the air outlet 33f. The protrusion of the second air inlet 32f is square in a horizontal plane. In the axial direction of the suction fan housing 3f, the second air inlet 32f is located in the middle of the suction fan housing 3f. In this embodiment, the second air inlet 32f in the suction fan housing 3f is located obliquely above the air outlet 33f. The second air inlet 32f is formed in the middle of the suction fan housing and is combined with the first air inlet 31f at both ends of the suction fan housing 3f to form three air inlets that are evenly distributed in the suction fan housing 3f, making it sufficient and more uniform in air intake. As shown in Fig. 2, the air blocking members are provided on both sides of the first air inlets 31f. In this embodiment, the air blocking members are in plate-shaped structures, and two air blocking members are respectively provided on each of the first air inlets 31f. As shown in Fig. 2, these two members are respectively a first air protection plate 51i near one side of the air outlet 33f and located in the upper half of the first air inlet 31f, and a second air protection plate 52i is located away from one side of the air outlet 33f and located in the lower half of the first air inlet 31f. In this embodiment, a communication hole communicating with the outside is formed in the chassis cover 1 corresponding to the first air inlets 3f.The communication hole is the same size as the first air inlets 31f, the two ends of the suction fan housing 3f are placed against the chassis cover 1, and the first air inlets 31f are directly opposite the communication hole, strip-shaped holes are formed in the first air protection plate 51i and the second air protection plate 52i, respectively, and paired holes are formed in the suction fan housing 3f and the corresponding chassis 1. The strip-shaped hole in the first air protection plate 51i is formed horizontally to facilitate the horizontal sliding of the first air protection plate 51i and partially block the upper half of the first air inlet 31f. The strip-shaped hole in the second air blocking plate 52i is formed vertically to facilitate the vertical sliding of the second air protection plate 52i and partially block the lower half of the first air inlet 31f. With the air protection plates blocked, the air intake area of the first air inlet 31f is adjusted, and the air intake volume changes under different working conditions, and the operating range becomes wider. As shown in Figure 5, the fan structure includes a fan shaft 1i, a plurality of holding units and a plurality of fan blades 2i. As shown in Figure 2, first air inlets 31f extend from both ends of the fan shaft 1i and are rotatably fixed to a bearing base located in the chassis 1. A drive belt pulley is installed at one end of the fan shaft 1i and is used to connect to a transmission shaft and provide driving force for rotating the fan structure. In this embodiment, the fan is driven by the transmission belt. As shown in Figure 5, the holding units are fixed on the fan shaft 1i at regular intervals, and the fan blades 2i are fixed on the holding units. As shown in Figure 3, each holding unit includes a plurality of fan blade brackets 3i that are screwed, fixed, and locked in the circumferential direction of the fan shaft 1i, respectively, and the fan blades 2i are screwed, fixed, and locked on the fan blade brackets 3i, respectively. In this embodiment, the fan blade brackets 3i are in plate-shaped structures and are bent to form fixed portions 32i and mounting portions 31i. In the same holding unit, the fixed portion 32i of one fan blade bracket 3i is bolted and fixed to the mounting portion 31i of the other fan blade bracket 3i. A plurality of fan blade brackets 3i are respectively connected end-to-end and enclosed to form a polygon in the circumferential direction of the fan shaft 1i, and the polygon is tangential from the outside to a circle of the cross-sectional area of the fan shaft 1i. A plurality of fan blade brackets 3i are fixed around the fan shaft 1i using bolts. As a result, this structure is simple and stable, and the parts are easily and conveniently detached and easily replaceable. All the fan blade brackets 3i in each of the holding units are enclosed to form a regular polygon, an angle α is formed between each fixed portion 32i, and each mounting portion 31i is the complement of the internal angle β of the regular polygon. As shown in Fig. 3 or 5, in this embodiment, four fan blade brackets 3i are provided in each of the holding units, the fixed portion 32i and the mounting portion 31i in each fan blade bracket 3i are at a right angle, and are jointly enclosed to form a square that is connected to the circle of the cross-sectional area of the fan shaft 1i from the outside. In this embodiment, as shown in FIG. 4 , a flat slot 11i is formed in the fan shaft 1i corresponding to each of the holding units. A reinforcing plate 4i is welded in the flat slot 11i. The reinforcing plate 4i has a thickness equal to the depth of the flat slot 11i, that is, an upper surface of the reinforcing plate 4i and the cross-sectional circle of the fan shaft 1i are in a tangential state, and at the same time, the reinforcing plate 4i has a radial width in the direction of the fan shaft 1i and is not greater than the diameter of the fan shaft 1i. As a result, it prevents the inability to assemble due to the width of the reinforcing plate 4i being larger than the length of the side of the square formed by enclosing the fan blade brackets 3i. In this embodiment, the reinforcing plate 4i has a width equal to the width of the flat slot 11i. By limiting the flat gap 11i, relative slippage between the fan blade brackets 3i and the fan shaft 1i is prevented due to a slight clamping force to fix the fan blade brackets 3i on the fan shaft 1i. As shown in Figure 5, in this embodiment, four holding units are spaced apart on the fan shaft 1i in order, and the two holding units on the left are provided with four fan blades 2i in sheet-like structures. Each fan blade 2i covers two holding units and is screwed and fixed on the mounting portions 31i by two fan blade brackets 3i. The fan blades 2i in the two holding units on the right have the same configuration as the fan blades 2i on the left, and the specific structure is not described in detail here. The fan blades 2i on the left and right form two groups of parallel fan structures, and more air inlet channels can be provided between the two groups of fan structures, so that the fan air supply area is large and the supplied air is uniform. As a first alternative embodiment of embodiment 1, the fan shaft 1i can have a plurality of flat slots 11i, and these slots correspond one to one with the fan blade brackets 3i, and the fan blade brackets 3i are directly and correspondingly inserted into the flat slots 11i and are respectively screwed and locked onto the fan shaft 1i from end to end. It is understood that the above embodiments are only for the purpose of clearly explaining the described examples, and not to limit the embodiments. Those of ordinary skill in the art can make other changes or modifications in various ways based on the above description. It is not necessary or impossible to list all of them here. Changes or modifications that are obvious from these embodiments are still within the scope of the invention.
Claims
Claims What is claimed is:
1. A harvester suction fan comprising: a suction fan housing (3f) provided with a cylindrical mounting hole; a fan structure coaxially disposed in the mounting hole; a suction fan driver connected to the fan structure and adapted to rotate the fan structure in the mounting hole, wherein the suction fan housing (3f) has primary air inlets (31f) axially formed at both ends thereof to communicate with the outside, and an air outlet (33f) axially formed in a side wall thereof. The air outlet (33f) has a width equal to the width of the installation hole, and the suction fan housing (3f) has a secondary air inlet (32f) formed circumferentially in its side wall and arranged to be opposite to the air outlet (33f), and the second air inlet (32f) is located in the middle of the suction fan housing (3f), in the axial direction of the suction fan housing (3f). 2.The suction fan according to claim 1 is characterized in that the air blocking components are located on each of the first air inlets (31f) and are arranged to change the air inlet area at the first air inlet (31f).
3. The suction fan according to claim 2 is characterized in that the air blocking components are in plate-shaped structures and are slidably placed on the suction fan housing (3f).
4. The suction fan according to claim 3 is characterized in that two air blocking members are located on each of the first air inlets (31f). One of the air blocking members is located on one side, at the air outlet (33f) of the first air inlet (31f) and is adapted to slide horizontally and block a portion of the upper half of the first air inlet (31f), and the other air blocking members are located on one side, away from the air outlet (33f) of the first air inlet (31f) and are adapted to slide vertically and block a portion of the lower half of the first air inlet (31f).
5. The characteristic of the harvester suction fan according to claim 4 is that strip-shaped holes are formed in the air-blocking components, and the air-blocking components are screwed and fixed to the suction fan housing (3f) through the strip-shaped holes.
6. The characteristic of the harvester suction fan according to any one of claims 1-5 is that the fan structure includes: a fan shaft (1i) coaxially disposed in the mounting hole, and two ends of the fan shaft (1i) are respectively fixed on two bearing chassis (1). A plurality of holding units fixed at uniform intervals on the fan shaft (1i). A plurality of fan blades (2i) fixed on the holding units, and each of the holding units includes: a plurality of fan blade brackets (2i) screwed and fixed and locked in the circumferential direction of the fan shaft (1i) on the shaft, in which the fan blades (2i) are respectively screwed and fixed on the fan blade brackets (2i). The fan blade brackets (2i) are enclosed to form a regular polygon, and the regular polygon is tangent from the outside to a circle of the cross-section of the fan shaft (1i).
7. The characteristic of the harvester suction fan according to claim 6 is that the fan blade brackets (2i) are bent to form fixed sections (32i) and mounting sections (31i). The end sections of the mounting sections (32i) are adapted to mount the fan blades (2i), and an angle α is formed between each fixed section (32i) and each mounting section (31i) is complementary to an interior angle β of a regular polygon formed by enclosing the fan blade brackets (2i).
8. The suction fan according to claim 7 is characterized in that a flat slot (11i) is formed in the fan shaft (1i) corresponding to each of the holding units and one of the fan blade brackets (2i) is fixed in the flat slot (11i).
9. The harvester suction fan according to claim 8 is characterized in that it further comprises: a reinforcing plate (4i) welded and fixed in the flat slot (11i) in which the fan blade brackets (2i) are fixed on the upper surface of the reinforcing plate (4i). The reinforcing plate has a thickness equal to the depth of the flat slot (11i), and the reinforcing plate (4i) has a width in the radial direction of the fan shaft (1i) that is not greater than the diameter of the fan shaft (1i).
10. The characteristic of the harvester suction fan according to claim 7 is that a plurality of flat slots (11i) formed in the fan shaft (1i) correspond one to one with the fan blade brackets (2i), and the mounting portions of the fan blade brackets (2i) are respectively fixed in the flat slots (11i).