Cleaning chamber and combine harvester

Abstract

The utility model relates to the field of agricultural machinery, and discloses a cleaning chamber and a combine harvester, and the cleaning chamber comprises a fan air outlet channel communicated with a cleaning cavity; the chamber bottom plate is provided with a guide plate part and an auger mounting part; the first flow guide structure is arranged in the fan air outlet channel; the second flow guide structure is arranged in the fan air outlet channel and located below the first flow guide structure, and a lower screen air channel capable of blowing air towards the tail of the upper screen along the bottom of the lower screen is defined between the first flow guide structure and the second flow guide structure. A bottom air duct capable of blowing air towards the auger mounting part is defined among the bottom wall of the fan air outlet channel, the guide plate part and the second flow guide structure, the second flow guide structure comprises a first bent plate and a second bent plate which are connected with each other, and the first bent plate and the bottom wall of the fan air outlet channel are arranged in parallel at an interval; and the second bending plate and the guide plate part are arranged in parallel at an interval. The cleaning chamber and the combine harvester are beneficial to improving the cleaning effect.

Description

Technical Field

[0001] This application belongs to the technical field of agricultural machinery, and particularly relates to a cleaning chamber and a combine harvester. Background Art

[0002] The cleaning device of a combine harvester is an important part of the harvester, and it conducts blowing and cleaning by taking advantage of the different suspension speeds of the mixtures in the cleaning chamber. Since the air flow speed in the cleaning chamber will inevitably decay, the air flow blowing towards the tail sieve will be greatly reduced, which is not conducive to discharging the impurities, and the working efficiency of the entire cleaning system is relatively low. Summary of the Invention

[0003] The purpose of this application is to provide a cleaning chamber and a combine harvester, which are beneficial to improving the cleaning effect.

[0004] To achieve the above purpose, on the one hand, this application provides a cleaning chamber with a cleaning cavity inside, and the cleaning chamber includes:

[0005] An air outlet channel of the fan, which is communicated with the cleaning cavity;

[0006] A chamber bottom plate, which has a guide plate part and a auger installation part. The bottom wall of the air outlet channel of the fan is connected to the guide plate part and is arranged in an inverted V shape, and the auger installation part is connected to the lower part of the guide plate part;

[0007] A first flow guiding structure, which is arranged in the air outlet channel of the fan; and

[0008] A second flow guiding structure, which is arranged in the air outlet channel of the fan and is located below the first flow guiding structure. A lower sieve air duct that can blow along the bottom of the lower sieve and towards the tail of the upper sieve is defined between the first flow guiding structure and the second flow guiding structure. A bottom air duct that can blow towards the auger installation part is defined between the bottom wall of the air outlet channel of the fan, the guide plate part and the second flow guiding structure. The second flow guiding structure includes a first bending plate and a second bending plate that are connected to each other. The first bending plate is arranged in parallel and at an interval with the bottom wall of the air outlet channel of the fan, and the second bending plate is arranged in parallel and at an interval with the guide plate part.

[0009] In some specific embodiments, the connecting edge between the first bending plate and the second bending plate can be located directly above the connecting edge between the bottom wall of the air outlet channel of the fan and the guide plate part.

[0010] In some specific embodiments, the second flow guiding structure is adjustably arranged on the side cavity wall of the cleaning cavity so as to be able to adjust the distance between the bottom wall of the air outlet channel of the fan, the guide plate part and the second flow guiding structure.

[0011] In some specific embodiments, the second diversion structure may further include a first rib plate, the first rib plate is respectively connected to the plate side edges of the first bent plate and the second bent plate, and a plurality of groups of adjustment holes are provided at intervals in the vertical direction on the side cavity wall of the cleaning chamber, and the first rib plate can be detachably connected to any one group of the adjustment holes through a fastener.

[0012] In some specific embodiments, the second diversion structure may further include a second rib plate, the second rib plate is respectively connected to the lower plate surfaces of the first bent plate and the second bent plate, and the plate surface of the second rib plate is located in a vertical plane.

[0013] In some specific embodiments, the length of the first bent plate may be less than the length of the second bent plate;

[0014] And / or, the length of the first bent plate is greater than 10 mm and less than or equal to 30 mm, and the length of the second bent plate is greater than 30 mm and less than or equal to 50 mm;

[0015] And / or, the included angle between the first bent plate and the second bent plate is greater than or equal to 100° and less than or equal to 150°.

[0016] In some specific embodiments, the first diversion structure may include a first air guiding member in the air outlet passage of the fan and a second air guiding member in front of the lower sieve, the first air guiding member and the second air guiding member are arranged at intervals and the first air guiding member is in front of the second air guiding member, and the length of the first air guiding member is greater than the length of the second air guiding member.

[0017] In some specific embodiments, the cleaning chamber may further include a third air guiding structure, the third air guiding structure is arranged in the air outlet passage of the fan and below the first air guiding structure, and a top air duct is defined between the third air guiding structure and the top wall of the air outlet passage of the fan, and the top air duct can blow air towards the passage between the end part of the vibrating plate and the front end part of the upper sieve, and an intermediate air duct is defined between the third air guiding structure and the first air guiding structure, and the intermediate air duct can blow air towards the passage between the upper sieve and the lower sieve.

[0018] In some specific embodiments, the third air guiding structure may include a third air guiding member in the air outlet passage of the fan and a fourth air guiding member in front of the upper sieve, the third air guiding member and the fourth air guiding member are arranged at intervals and the third air guiding member is in front of the second air guiding member, and the length of the third air guiding member is greater than the length of the fourth air guiding member.

[0019] The second aspect of the present application provides a combine harvester, and the combine harvester includes:

[0020] A threshing device; and

[0021] The above-mentioned cleaning chamber is located below the threshing device.

[0022] Through the above technical solution, by adding a second diversion structure to divide the space below the first diversion structure into a lower sieve air duct and a bottom air duct, the air flow blowing to the lower part of the lower sieve is separated into two air flows. The air flow in the bottom air duct can reduce the backflow effect of the air flow in the lower sieve air duct, ensure the air volume of the air flow in the lower sieve air duct, thereby improving the cleaning and conveying capacity of the tail sieve and reducing the load of the tail sieve. In addition, the first bending plate and the second bending plate of the second diversion structure are respectively arranged parallel to the bottom wall and the guiding plate part of the air outlet channel of the fan, which can further optimize the air flow in the lower sieve air duct and the bottom air duct, significantly reduce the air flow eddy in the cleaning chamber, and is beneficial to improving the cleaning effect.

[0023] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts. In the drawings:

[0025] Figure 1 A partial structural schematic diagram of a combine harvester showing a specific embodiment of the present application is shown;

[0026] Figure 2 Shown is Figure 1 The air flow direction schematic diagram of the combine harvester in

[0027] Figure 3 Shown is Figure 1 The installation structure schematic diagram of the second diversion structure and the side cavity wall of the cleaning cavity in

[0028] Figure 4 Shown is Figure 1 The structural schematic diagram of the second diversion structure in

[0029] DESCRIPTION OF THE REFERENCE NUMERALS

[0030] 11 Cleaning cavity 121 Guiding plate part

[0031] 122 Auger installation part 123 Grain chute

[0032] 13 Adjusting hole 21 Air outlet channel of the fan

[0033] 22 Fan 31 First diversion structure

[0034] 311 First air guide member 312 Second air guide member

[0035] 32 Second air diversion structure 321 First bending plate

[0036] 322 Second bending plate 323 First rib plate

[0037] 324 Second rib plate 325 Mounting hole

[0038] 33 Third air diversion structure 331 Third air guide member

[0039] 332 Fourth air guide member 41 Lower sieve

[0040] 42 Tail sieve 43 Shaking plate

[0041] 44 Upper sieve 5 Threshing device Specific embodiments

[0042] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present application, and are not intended to limit the present application.

[0043] Since the air flow velocity in the cleaning chamber decays, the air flow blowing towards the tail sieve is insufficient, and the cleaning effect of the existing cleaning chamber is usually not good. For this reason, the inventors of the present application have continuously thought and found that in addition to the attenuation of the air flow blowing towards the lower part of the lower sieve due to the long air path, more importantly, due to the specific shape between the air outlet channel of the fan and the chamber bottom plate, part of the air flow blowing towards the lower part of the lower sieve fails to reach the tail of the upper sieve due to insufficient power, but forms a backflow along the cleaning chamber bottom plate, resulting in waste of air volume, and also significantly reducing the air volume blowing towards the tail of the upper sieve and the tail sieve, which is not conducive to the discharge of impurities, thus resulting in poor cleaning effect of the cleaning chamber.

[0044] In view of this, as shown in Figure 1 、 Figure 2 and Figure 3 shown, the present application provides a new type of cleaning chamber, which is provided with a cleaning cavity 11 and includes an air outlet channel 21 of the fan, a chamber bottom plate, a first air diversion structure 31 and a second air diversion structure 32. Among them, an upper sieve 44, a lower sieve 41, a tail sieve 42 and a shaking plate 43 are arranged in the cleaning cavity 11. The shaking plate 43 is located above the air outlet channel 21 of the fan, the upper sieve 44 and the lower sieve 41 are located behind and below the shaking plate 43, the upper sieve 44 is located above the lower sieve 41, and the tail sieve 42 is located behind the upper sieve 44.

[0045] Among them, a fan 22 is provided in the air outlet passage 21 of the fan and is communicated with the cleaning chamber 11. The chamber bottom plate is located below the lower sieve 41 and has a guiding plate portion 121, a screw conveyor mounting portion 122, and a rear inclined portion connected in sequence. A grain slide plate 123 is provided at the rear of the rear inclined portion. The bottom wall of the air outlet passage 21 of the fan is connected to the guiding plate portion 121 and is arranged in an inverted V shape. The screw conveyor mounting portion 122 is connected to the lower part of the guiding plate portion 121. The first guiding structure 31 is provided in the air outlet passage 21 of the fan. The second guiding structure 32 is provided in the air outlet passage 21 of the fan and is located below the first guiding structure 31. A lower sieve air duct that can blow air along the bottom of the lower sieve 41 and towards the tail of the upper sieve 44 is defined between the first guiding structure 31 and the second guiding structure 32. A bottom air duct that can blow air towards the screw conveyor mounting portion 122 is defined between the bottom wall of the air outlet passage 21 of the fan and the guiding plate portion 121 and the second guiding structure 32. It can be seen that by adding the second guiding structure 32, the space below the first guiding structure 31 is divided to form a lower sieve air duct and a bottom air duct, so that the air flow blowing to the lower part of the lower sieve 41 is separated into two air flows. The air flow in the bottom air duct can reduce the backflow effect of the air flow in the lower sieve air duct, ensure the air volume of the air flow in the lower sieve air duct, thereby improving the cleaning and conveying capacity of the tail sieve and reducing the load of the tail sieve.

[0046] In addition, the second guiding structure 32 includes a first bent plate 321 and a second bent plate 322 connected to each other. The first bent plate 321 is arranged parallel and spaced from the bottom wall of the air outlet passage 21 of the fan. The second bent plate 322 is arranged parallel and spaced from the guiding plate portion 121. The first bent plate 321 has a guiding effect on the air flow D3 blown out from the lower sieve air duct. And due to the flow splitting effect of the second guiding structure 32, the resistance of the air flow D3 can be dispersed to a certain extent, effectively reducing the backflow effect of the air flow D3 blown out from the lower sieve air duct. At the same time, due to the influence of the resistance, a small part of the air flow D4 blown out from the bottom air duct will form a weak backflow at the chamber bottom plate during the flowing process, but most of the remaining air flow will still blow towards the tail of the upper sieve 44 and the tail sieve 42 along the rear inclined portion of the chamber bottom plate. It can be seen that after adding the second guiding structure 32, the internal air flow eddy of the cleaning chamber 11 can be significantly optimized and the air volume blown towards the tail of the upper sieve 44 and the tail sieve 42 can be increased, thereby greatly alleviating the situation of the blocked conveying of the tail sieve 42 and reducing the load of the tail sieve 42.

[0047] Optionally, the connecting edge between the first bent plate 321 and the second bent plate 322 can be located directly above the connecting edge between the bottom wall of the air outlet passage 21 of the fan and the guiding plate portion 121. In this way, the resistance of the air flow can be reduced and the internal air flow eddy of the cleaning chamber 11 can be further optimized.

[0048] In some specific embodiments, the second flow guiding structure 32 is disposed on the side cavity wall of the cleaning cavity 11 in a position-adjustable manner, so as to be able to adjust the distance between the bottom wall of the air outlet passage 21 of the fan and the guiding plate portion 121 and the second flow guiding structure 32. In this way, it is beneficial to adjust the air outlet angle and air volume of the air flow blown out from the lower sieve air duct according to actual usage requirements, and obtain an ideal vortex optimization and cleaning effect. For example, upward adjustment of the second flow guiding structure 32 will cause the air outlet angle of the air flow D3 blown out from the lower sieve air duct to incline upward in the cleaning cavity 11, but will correspondingly reduce the air volume of the air flow D3 blown out from the lower sieve air duct and increase the air volume of the air flow D4 blown out from the bottom air duct. During actual use, by adjusting the position of the second flow guiding structure 32 up and down, the air flows blown out from the lower sieve air duct and the bottom air duct can be controlled, and the vortex optimization effect and cleaning effect can meet specific different requirements to achieve the best cleaning effect.

[0049] Specifically, as Figure 3 and Figure 4 shown, the second flow guiding structure 32 further includes a first rib plate 323. The first rib plate 323 is respectively connected to the plate side edges of the first bent plate 321 and the second bent plate 322. A plurality of groups of adjustment holes 13 are provided on the side cavity wall of the cleaning cavity 11 at intervals in the up-down direction. Mounting holes 325 are provided on the first rib plate 323. The first rib plate 323 is fixed by a fastener passing through the mounting holes 325 and any one group of adjustment holes 13, so as to form a detachable connection with the side cavity wall of the cleaning cavity 11. In this way, the second flow guiding structure 32 can be adjusted up and down, and the adjustment range up and down can be designed according to the specific situation of each model. The unused adjustment holes 13 on the side cavity wall of the cleaning cavity 11 need to be tightly sealed with putty to prevent air leakage. The fastener may include bolts, nuts, flat gaskets, etc. At least two mounting holes may be provided. The first rib plate 323 may be welded to the first bent plate 321 and the second bent plate 322. The interval between each group of adjustment holes 13 may be 8-12 mm, preferably 10 mm. 2-5 groups of adjustment holes 13 may be provided, for example, 3 groups, so as to realize three-stage height adjustment of the second flow guiding structure 32. For example, the minimum distance between the second flow guiding structure 32 and the chamber bottom plate can be set in three stages, which are 10 mm, 20 mm, and 30 mm respectively.

[0050] Alternatively, in another embodiment, an installation long slot extending in the up-down direction may be provided on the side cavity wall of the cleaning cavity 11, and the second flow guiding structure 32 may be installed at any position on the installation long slot through a fastener to realize adjustable up-down position.

[0051] Optionally, as Figure 4As shown, the second flow guiding structure 32 may further include one or more second rib plates 324 arranged in parallel at intervals. The second rib plates 324 are respectively connected to the lower plate surfaces of the first bent plate 321 and the second bent plate 322, and the plate surfaces of the second rib plates 324 are located in a vertical plane. The second rib plates 324 may be welded to the first bent plate 321 and the second bent plate 322, mainly playing a role in strengthening the structure.

[0052] In addition, the length of the first bent plate 321 is less than that of the second bent plate 322. In this way, the structure can be made more reasonable, and the flow guiding effect and the eddy current optimization effect are better. The length of the first bent plate 321 is greater than 10 mm and less than or equal to 30 mm, preferably 20 mm; the length of the second bent plate 322 is greater than 30 mm and less than or equal to 50 mm, preferably 40 mm. The included angle between the first bent plate 321 and the second bent plate 322 is greater than or equal to 100° and less than or equal to 150°, preferably 125°.

[0053] Furthermore, as Figure 1 and Figure 2 shown, the first flow guiding structure 31 may include a first air guiding member 311 located in the air outlet passage 21 of the fan and a second air guiding member 312 located in front of the lower sieve 41. The first air guiding member 311 and the second air guiding member 312 are arranged at intervals and the first air guiding member 311 is located in front of the second air guiding member 312. The length of the first air guiding member 311 is greater than that of the second air guiding member 312. In this way, the flow guiding structure can be made more reasonable and the cleaning effect is better.

[0054] Even further, as Figure 1 and Figure 2 shown, the cleaning chamber may further include a third flow guiding structure 33. The third flow guiding structure 33 is arranged in the air outlet passage 21 of the fan and is located below the first flow guiding structure 31. A top air duct that can blow air toward the passage between the end part of the vibrating plate 43 and the front end part of the upper sieve 44 is defined between the third flow guiding structure 33 and the top wall of the air outlet passage 21 of the fan, and an intermediate air duct that can blow air toward the passage between the upper sieve 44 and the lower sieve 41 is defined between the third flow guiding structure 33 and the first flow guiding structure 31. Specifically, the fan 22 rotates at a rated speed under the drive of the prime mover, and the compressed air flows into the cleaning area along the designed path through the first flow guiding structure 31, the second flow guiding structure 32, and the third flow guiding structure 33. Among them, the air flow D1 blown out from the top air duct is used for quickly separating the impurities and residual grains ejected from the end of the vibrating plate 43, and directly blowing the light impurities to the outlet of the tail sieve 42; the air flow D2 blown out from the intermediate air duct is used for the gradual separation of the upper sieve 44. During the reciprocating movement of the upper sieve 44, with the cooperation of air flow cleaning, the grains leak through the pores of the upper sieve, and the long stalks are continuously conveyed backward; the air flow blown out from the lower sieve air duct is used for quickly blowing out the impurities such as the long stalks after screening, and helping to blow out the light impurities cleaned by the previous two parts of air flow.

[0055] Optionally, as Figure 1 shown, the third air guiding structure 33 includes a third air guiding member 331 located in the air outlet passage 21 of the fan and a fourth air guiding member 332 located in front of the upper sieve 44. The third air guiding member 331 and the fourth air guiding member 332 are arranged at intervals and are located in front of the fourth air guiding member 332. The length of the third air guiding member 331 is greater than the length of the fourth air guiding member 332. Similarly, the air guiding structure can be made more reasonable and the cleaning effect can be better.

[0056] As Figure 1 shown, in the second aspect of the present application, a combine harvester is further provided. The combine harvester includes a threshing device 5 and the above-mentioned cleaning chamber, and the cleaning chamber is located below the threshing device 5. Since the combine harvester includes the above-mentioned cleaning chamber, it also has all the technical effects brought by the cleaning chamber, so it will not be repeated here. Among them, the combine harvester can be a rice combine harvester, a wheat combine harvester or other cereal grain combine harvesters.

[0057] It should be noted that the structures and principles of components such as the upper sieve 44, the lower sieve 41, the tail sieve 42, the vibrating plate 43 and the threshing device 5 are well known to those skilled in the art and do not belong to the core improvement part of the present application, so they will not be elaborated here.

[0058] In summary, the present application provides a novel cleaning chamber and a combine harvester. The cleaning chamber has a good optimization effect on the internal eddy current, can enhance the blowing and conveying capabilities of the tail of the upper sieve and the tail sieve for impurities and residues, reduce the situation that the tail sieve is blocked by cereal impurities and residues, and at the same time can reduce the load of the impurity auger and the impurity content rate, and improve the cleaning effect.

[0059] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0061] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0062] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A cleaning chamber, provided with a cleaning cavity (11), characterized in that: include: A fan air outlet channel (21) is connected to the cleaning chamber (11); The chamber bottom plate comprises a guide plate portion (121) and an auger mounting portion (122), the bottom wall of the fan air outlet passage (21) and the guide plate portion (121) are connected and arranged in an inverted V shape, and the auger mounting portion (122) is connected to the lower portion of the guide plate portion (121); A first flow guiding structure (31) is arranged in the fan air outlet passage (21); and A second flow guiding structure (32) is arranged in the fan air outlet passage (21) and is located below the first flow guiding structure (31); a lower screen air duct capable of blowing air along the bottom of the lower screen (41) and toward the tail of the upper screen (44) is defined between the first flow guiding structure (31) and the second flow guiding structure (32); a bottom air duct capable of blowing air toward the auger mounting portion (122) is defined between the bottom wall of the fan air outlet passage (21) and the guide plate portion (121) and the second flow guiding structure (32); the second flow guiding structure (32) comprises a first bent plate (321) and a second bent plate (322) connected to each other; the first bent plate (321) is arranged in parallel and spaced relation to the bottom wall of the fan air outlet passage (21); and the second bent plate (322) is arranged in parallel and spaced relation to the guide plate portion (121).

2. The cleaning chamber according to claim 1, characterized in that: The connecting edge between the first bent plate (321) and the second bent plate (322) is located directly above the connecting edge between the bottom wall of the fan air outlet channel (21) and the guide plate portion (121).

3. The cleaning chamber according to claim 1, characterized in that: The second flow guide structure (32) is adjustably arranged on the side cavity wall of the cleaning cavity (11) so as to be able to adjust the bottom wall of the fan air outlet channel (21) and the spacing between the guide plate portion (121) and the second flow guide structure (32).

4. The cleaning chamber according to claim 3, characterized in that: The second guide structure (32) also includes a first rib plate (323), and the first rib plate (323) is respectively connected to the side edges of the first bent plate (321) and the second bent plate (322), and the side cavity wall of the cleaning cavity (11) is provided with a plurality of groups of adjustment holes (13) at intervals along the up and down directions, and the first rib plate (323) can be detachably connected to any group of the adjustment holes (13) by fasteners.

5. The cleaning chamber according to claim 1, characterized in that: The second flow-guiding structure (32) further comprises a second rib plate (324), wherein the second rib plate (324) is respectively connected to the lower plate surfaces of the first bent plate (321) and the second bent plate (322), and the plate surface of the second rib plate (324) is located on a vertical plane.

6. The cleaning chamber according to claim 1, characterized in that: The length of the first bent plate (321) is shorter than the length of the second bent plate (322); And / or, the length of the first bent plate (321) is greater than 10 mm and less than or equal to 30 mm, and the length of the second bent plate (322) is greater than 30 mm and less than or equal to 50 mm; And / or, the angle between the first bending plate (321) and the second bending plate (322) is greater than or equal to 100° and less than or equal to 150°.

7. The cleaning chamber according to claim 1, characterized in that: The first air guide structure (31) comprises a first air guide member (311) located in the fan air outlet channel (21) and a second air guide member (312) located in front of the lower screen (41); the first air guide member (311) and the second air guide member (312) are arranged at an interval and located in front of the second air guide member (312); the length of the first air guide member (311) is greater than the length of the second air guide member (312).

8. The cleaning chamber according to claim 1, characterized in that: The cleaning chamber further comprises a third air guide structure (33), wherein the third air guide structure (33) is arranged in the fan air outlet passage (21) and is located below the first air guide structure (31); a top air duct capable of blowing air toward the passage between the rear end of the shaking plate (43) and the front end of the upper screen (44) is defined between the third air guide structure (33) and the first air guide structure (31); and an intermediate air duct capable of blowing air toward the passage between the upper screen (44) and the lower screen (41) is defined between the third air guide structure (33) and the first air guide structure (31).

9. The cleaning chamber according to claim 8, characterized in that The third air guide structure (33) comprises a third air guide member (331) located in the fan air outlet channel (21) and a fourth air guide member (332) located in front of the upper screen (44); the third air guide member (331) is spaced apart from the fourth air guide member (332) and is located in front of the fourth air guide member (332); the length of the third air guide member (331) is greater than the length of the fourth air guide member (332).

10. A combine harvester, characterized in that: include: Threshing device (5); and The cleaning chamber according to any one of claims 1 to 9 is located below the threshing device (5).

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