A cleaning fan for a combine harvester and a combine harvester
By separating the inner cavity and air inlet in the cleaning fan of the combine harvester, using flat blades and support plate assemblies, and combining them with vortex baffles, the problem of short airflow path is solved, and the effect of efficiently blowing out debris over a long distance is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN ZOOMLION INTELLIGENT AGRICULTURAL MACHINERY CO LTD
- Filing Date
- 2025-07-07
- Publication Date
- 2026-06-02
AI Technical Summary
The existing cleaning blowers for combine harvesters have a short airflow path, resulting in poor debris removal and making it difficult to meet the needs of long-distance material blowing.
Design a cleaning fan by dividing the inner cavity of the fan casing into two inner cavities and using a fan baffle to divide the air inlet into three, thereby reducing airflow backflow and increasing air volume and air path. Flat blades and support plate assemblies are used to reduce flow resistance, and vortex baffles are combined to eliminate backflow areas and improve airflow blowing efficiency.
It effectively reduces airflow energy loss, increases airflow distance and output volume, and can meet the requirements of blowing grains and debris out over long distances and at high wind speeds, thereby improving the operating efficiency of combine harvesters.
Smart Images
Figure CN224315213U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of agricultural machinery technology, specifically relating to a cleaning blower for a combine harvester and a combine harvester. Background Technology
[0002] Most existing combine harvesters use a single centrifugal fan as the cleaning fan, which is placed in the cleaning chamber to generate an airflow with a certain speed, thereby blowing impurities in the grains to the tail screen outlet. However, because the airflow generated by traditional cleaning fans has a short path, the airflow is severely attenuated by the time it reaches the tail screen area, thus greatly reducing the effect of blowing away impurities. As vibrating screens continue to develop towards greater lengths, existing cleaning fans are unable to meet the needs of long-distance material blowing. Utility Model Content
[0003] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a cleaning fan and a combine harvester for a combine harvester, which can effectively reduce airflow energy loss, increase airflow distance, and meet the requirements of blowing out debris over long distances.
[0004] To achieve the above objectives, this application provides a cleaning fan for a combine harvester, the cleaning fan comprising:
[0005] The fan housing has an internal cavity that runs horizontally through it, and the side wall of the fan housing has a fan inlet that communicates with the internal cavity.
[0006] Two fan baffles are arranged parallel to each other in the middle region of the housing cavity to divide the housing cavity into a first inner cavity and a second inner cavity, and to divide the fan inlet into a corresponding first air inlet and a second air inlet, with a middle air inlet duct defined between the two fan baffles.
[0007] Two blade sets are respectively disposed in the first inner cavity and the second inner cavity; and
[0008] The fan shaft is used to drive the two blade sets to rotate.
[0009] In some embodiments, the fan baffle is an annular baffle with a central through-hole, the intermediate air inlet duct is connected to the first inner cavity and the second inner cavity, and the fan shaft passes through the two fan baffles and is drivenly connected to the two blade groups.
[0010] In some embodiments, the outer edge of the fan baffle is welded to the inner wall of the fan housing.
[0011] In some embodiments, the blade assembly includes a plurality of blades circumferentially spaced around the fan shaft, the blades being flat and extending axially along the fan shaft, the central axis of the fan shaft being located on the plane of the blades, and the end corners of the blades near the fan shaft being chamfered.
[0012] In some embodiments, the cleaning fan further includes two support plate assemblies arranged axially at intervals along the fan shaft. The two support plate assemblies are respectively fixedly connected to the two blade assemblies. The support plate assembly includes multiple support plates, and the surface of the support plates is arranged perpendicular to the axial direction of the fan shaft.
[0013] In some embodiments, the thickness of the support plate is no more than 5 mm.
[0014] In some embodiments, the support plate is welded to the peripheral wall of the fan shaft; and / or, the blades are welded to the support plate.
[0015] A second aspect of this application provides a combine harvester, the combine harvester comprising:
[0016] Cleaning room;
[0017] A threshing mechanism, disposed within the cleaning chamber, includes a threshing drum and a vortex baffle, the vortex baffle being positioned behind the threshing drum; and
[0018] The cleaning fan described above for a combine harvester is disposed in the cleaning chamber and located below the threshing drum.
[0019] In some embodiments, at least two vortex baffles are provided, which are arranged parallel to each other in the front-back direction of the cleaning chamber and staggered in the vertical direction of the cleaning chamber.
[0020] In some embodiments, the vortex baffle is welded to the inner wall of the cleaning chamber.
[0021] Through the above technical solution, in the cleaning fan for combine harvesters of this application, two fan baffles can divide the inner cavity of the fan housing into two inner cavities, thereby supporting the installation and operation of two blade groups. Crucially, the two fan baffles can also divide the fan inlet into three inlets. The first and second inlets, which are respectively connected to the first and second inner cavities, can supply air to the two blade groups. The intermediate air inlet defined between the two fan baffles serves as the intermediate air inlet. When air is introduced, the two fan baffles block the airflow, which can effectively eliminate the backflow phenomenon of the airflow between the two blade groups. This reduces the energy loss of the airflow generated by the fan, increases the air volume and the airflow path, and enables it to meet the operational requirements of blowing grains and debris from a long distance and at high wind speed when applied to a combine harvester.
[0022] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description
[0023] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:
[0024] Figure 1 This is a cross-sectional view of the cleaning chamber of a combine harvester according to a specific embodiment of this application;
[0025] Figure 2 This is a partial schematic diagram of a cleaning fan for a combine harvester according to a specific embodiment of this application.
[0026] Explanation of reference numerals in the attached figures
[0027] Detailed Implementation
[0028] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.
[0029] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.
[0030] like Figure 1 and Figure 2As shown, a first exemplary embodiment of this application provides a cleaning fan for a combine harvester. The cleaning fan mainly includes a fan housing 101, two fan baffles 102, two blade sets, and a fan shaft 103. The interior of the fan housing 101 forms a shape along the transverse direction (i.e.,...). Figure 1 The combine harvester has a through-cavity housing (running horizontally). The side wall of the fan housing 101 has a fan inlet communicating with the inner cavity. Two fan baffles 102 are arranged parallel to each other in the middle region of the inner cavity, dividing it into a first inner cavity and a second inner cavity. Simultaneously, the fan inlet is divided into a first inlet communicating with the first inner cavity and a second inlet communicating with the second inner cavity. A central air inlet duct 106 is defined between the two fan baffles 102. Two blade sets are respectively disposed in the first and second inner cavities. The fan shaft 103 is drively connected to the two blade sets to drive their rotation.
[0031] Therefore, in the cleaning fan for a combine harvester in this exemplary embodiment, the two fan baffles 102 can divide the inner cavity of the fan housing 101 into two inner cavities, thereby supporting the installation and operation of two blade groups. Crucially, the two fan baffles 102 can also divide the fan inlet into three inlets, wherein the first inlet and the second inlet, which are respectively connected to the first inner cavity and the second inner cavity, can supply air to the two blade groups. The intermediate air inlet duct 106 defined between the two fan baffles 102 serves as the intermediate air inlet. When air is introduced, the two fan baffles 102 are used to block the wind, which can effectively eliminate the backflow phenomenon of the intake airflow between the two blade groups, thereby reducing the energy loss of the airflow generated by the fan, increasing the air volume and increasing the airflow path. When applied to a combine harvester, it can meet the operational requirements of blowing grains and impurities away at long distances and high wind speeds.
[0032] In one embodiment, such as Figure 2 As shown, the fan baffle 102 is formed as an annular baffle through the middle. Because the fan baffle 102 is through the middle, the intermediate air inlet duct 106 can communicate with both the first and second inner cavities simultaneously, and the fan shaft 103 can pass through both fan baffles 102 to be simultaneously connected to the two blade groups. Of course, in some other embodiments, if the fan shaft 103 does not pass through the fan baffle 102, two fan shafts 103 can be provided to connect to the two blade groups respectively, and this application does not limit this.
[0033] Furthermore, the outer edge of the fan baffle 102 is welded to the inner wall of the fan housing 101, thereby ensuring the stability of the fan baffle 102, and achieving a higher degree of integration and better wind-blocking effect. In other embodiments, the fan baffle 102 may also be connected to the inner wall of the fan housing 101 by some fasteners, such as by bolt assemblies, and this application does not limit this.
[0034] like Figure 2 As shown, each blade group includes multiple blades 104 arranged circumferentially around the fan shaft 103. The blades 104 are flat and extend axially along the fan shaft 103. The central axis of the fan shaft 103 lies on the plane containing the blades 104. When the fan shaft 103 rotates, the multiple blades 104 rotate simultaneously, blowing air towards the outlet of the fan housing 101, thereby generating an airflow at a certain speed. Crucially, the end corners of the blades 104 near the fan shaft 103 are chamfered, i.e., cut corners, which reduces airflow resistance and effectively increases the airflow volume of the cleaning fan 1, improving its blowing performance.
[0035] Furthermore, the cleaning blower also includes two support plate assemblies arranged axially at intervals along the blower shaft 103. The two support plate assemblies are respectively fixedly connected to two blade assemblies, enabling the blower shaft 103 to drive the two blade assemblies to rotate. Each support plate assembly includes multiple support plates 105, the surface of which is perpendicular to the axial direction of the blower shaft 103. This effectively reduces the wind resistance of the support plates 105, thereby increasing the airflow of the cleaning blower 1 and further improving its blowing performance.
[0036] In one embodiment, the thickness of the support plate 105 is no more than 5 mm, thereby maximizing the requirement for low wind resistance, reducing weight, lowering energy consumption, and reducing material costs.
[0037] In one embodiment, the support plate 105 is welded and fixed to the peripheral wall of the wind turbine shaft 103 to enhance the structural strength of the support plate 105 and improve its integrity. Furthermore, the blades 104 can also be welded and fixed to the support plate 105 to enhance the structural strength of the blade assembly and improve its integrity. In other embodiments, the support plate 105 can be fixed to the peripheral wall of the wind turbine shaft 103 and the blades 104 can be fixed to the support plate 105 using other fasteners, such as bolt assemblies; this application does not limit this method.
[0038] like Figure 1 As shown, a second exemplary embodiment of this application provides a combine harvester, which includes a cleaning chamber 2, a threshing mechanism 3, and the aforementioned cleaning fan 1 for the combine harvester. The threshing mechanism 3 is disposed within the cleaning chamber 2 and includes a threshing drum 301 and a vortex baffle 302. The vortex baffle 302 is disposed behind the threshing drum 301 (i.e., in the attached diagram). Figure 1 (The right side of the image can also be understood as the rear of the direction of travel of the combine harvester), while the cleaning fan 1 is located inside the cleaning chamber 2 and below the threshing drum 301.
[0039] In addition, refer to the appendix Figure 1 The combine harvester also includes a shaking plate 5 and a vibrating screen 6 installed in the cleaning chamber 2 for separating grains and impurities. These two structures are well known to those skilled in the art and are not part of the core improvements of this application, so they will not be described in detail here. However, it should be noted that when the cleaning fan 1 is running, it blows air toward the shaking plate 5 and the vibrating screen 6. The airflow travels along the length of the shaking plate 5 and the vibrating screen 6. When the threshing drum 301 is rotating, airflow is also generated behind the threshing drum 301. Therefore, the airflow generated by the cleaning fan 1 and the airflow generated by the threshing drum 301 will converge behind the threshing drum 301 to form a low-speed backflow zone. This will significantly reduce the amount of airflow generated by the cleaning fan 1 that blows toward the tail of the vibrating screen 6, which is not conducive to blowing out impurities.
[0040] Therefore, by setting a vortex baffle 302 behind the threshing drum 301, the airflow generated behind the threshing drum 301 can be blocked, thereby eliminating the low-speed backflow zone behind the threshing drum 301 and increasing the airflow generated by the cleaning blower 1 towards the tail of the vibrating screen 6, thereby efficiently blowing the debris located at the tail of the vibrating screen 6 out of the cleaning chamber 2.
[0041] In one embodiment, such as Figure 1 As shown, two vortex baffles 302 can be provided. The two vortex baffles 302 are arranged parallel to each other in the front-back direction of the cleaning chamber 2, and are staggered in the vertical direction of the cleaning chamber 2, thereby further improving the wind-blocking effect of the vortex baffles 302. Of course, in some other embodiments, more vortex baffles 302 can be provided to block the airflow behind the threshing drum 301 according to the length and height of the cleaning chamber 2, thereby improving the blowing and impurity removal efficiency of the cleaning fan 1.
[0042] In one embodiment, the vortex baffle 302 is welded to the inner wall of the cleaning chamber 2, thereby enhancing the structural strength of the vortex baffle 302. Of course, in other embodiments, the vortex baffle 302 may also be connected to the inner wall of the cleaning chamber 2 by some fasteners, such as by bolt assemblies, and this application is not limited to this.
[0043] In one embodiment, multiple diversion plates 4 may also be provided inside the cleaning fan 1, such as... Figure 1The two diversion plates 4 shown are arranged vertically at intervals behind the cleaning fan 1, i.e. at the air outlet of the cleaning fan 1, thereby dividing the airflow generated by the cleaning fan 1 into three streams. The first stream blows towards the shaking plate 5, quickly separating the impurities and grains that come off the end of the shaking plate 5. The second stream blows towards the middle of the vibrating screen 6, quickly separating the impurities and grains that come off the middle of the vibrating screen 6. The third stream blows along the lower part of the vibrating screen 6 towards the tail of the vibrating screen 6, quickly blowing out the long stalks and other impurities after screening, and helping the impurities blown out by the first two streams to be further blown out of the cleaning chamber 2.
[0044] Thanks to the cleaning fan 1 with strong wind and sufficient air volume specially designed in this application, the airflow blowing towards the tail of the vibrating screen 6 will not be insufficient due to long wind path and high resistance, so as to efficiently discharge the screened debris, which is more suitable for use in combine harvesters with a longer vibrating screen 6.
[0045] The embodiments of this application have been described in detail above with reference to the accompanying drawings, but the scope of protection of this application is not limited to the above-described embodiments. Those skilled in the art can make various modifications without departing from the concept of this application, such as replacing the fan baffle with an irregularly shaped structure, or adjusting the number of blades 104 to 6-10, etc., and these improvements all fall within the scope of protection of the claims of this application.
[0046] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0048] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0049] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. A cleaning blower for a combine harvester, characterized in that, The cleaning fan includes: The fan housing (101) has a transversely penetrating inner cavity inside, and the side wall of the fan housing (101) is provided with a fan inlet that communicates with the inner cavity of the housing. Two fan baffles (102) are arranged parallel to each other in the middle region of the housing cavity to divide the housing cavity into a first inner cavity and a second inner cavity, and to divide the fan inlet into a corresponding first air inlet and a second air inlet. An intermediate air inlet channel (106) is defined between the two fan baffles (102). Two blade sets are respectively disposed in the first inner cavity and the second inner cavity; and The fan shaft (103) is used to drive the two blade sets to rotate.
2. The cleaning blower for a combine harvester according to claim 1, characterized in that, The fan baffle (102) is an annular baffle with a central through-hole. The intermediate air inlet (106) is connected to the first inner cavity and the second inner cavity. The fan shaft (103) passes through the two fan baffles (102) and is driven to the two blade groups.
3. The cleaning blower for a combine harvester according to claim 2, characterized in that, The outer edge of the fan baffle (102) is welded to the inner wall of the fan housing (101).
4. The cleaning blower for a combine harvester according to claim 1, characterized in that, The blade assembly includes a plurality of blades (104) arranged circumferentially around the fan shaft (103). The blades (104) are flat and extend axially along the fan shaft (103). The central axis of the fan shaft (103) is located on the plane where the blades (104) are located. The end corners of the two ends of the blades (104) near the fan shaft (103) are chamfered.
5. The cleaning blower for a combine harvester according to claim 4, characterized in that, The cleaning fan also includes two support plate groups arranged at axial intervals along the fan shaft (103). The two support plate groups are respectively fixedly connected to the two blade groups. The support plate group includes multiple support plates (105). The plate surface of the support plate (105) is arranged perpendicular to the axial direction of the fan shaft (103).
6. The cleaning blower for a combine harvester according to claim 5, characterized in that, The thickness of the support plate (105) is no more than 5 mm.
7. The cleaning blower for a combine harvester according to claim 5, characterized in that, The support plate (105) is welded to the peripheral wall of the fan shaft (103); and / or, the blade (104) is welded to the support plate (105).
8. A combine harvester, characterized in that, The combine harvester includes: Cleaning room (2); A threshing mechanism (3) is disposed within the cleaning chamber (2) and includes a threshing drum (301) and a vortex baffle (302), the vortex baffle (302) being disposed behind the threshing drum (301); and The cleaning blower (1) for a combine harvester according to any one of claims 1 to 7, wherein the cleaning blower (1) is disposed in the cleaning chamber (2) and located below the threshing drum (301).
9. The combine harvester according to claim 8, characterized in that, At least two vortex baffles (302) are provided. The two vortex baffles (302) are arranged parallel to each other in the front-back direction of the cleaning chamber (2), and the two vortex baffles (302) are arranged alternately in the up-down direction of the cleaning chamber (2).
10. The combine harvester according to claim 8, characterized in that, The vortex baffle (302) is welded to the inner wall of the cleaning chamber (2).