Improved agricultural product distribution system

Abstract

[Seed distribution device for an agricultural machine, comprising a housing, a seed inlet, a perforated and driven disc for conveying the seeds, and an outlet tube. The seeds are conveyed from a reservoir to the outlet tube by means of an air pressure differential. The air pressure differential is interrupted to allow the seeds to leave the disc and enter the outlet tube. The outlet tube includes a first portion into which the seeds enter via an inlet. This first portion of the outlet tube is located inside the housing and is oriented so that the inlet is adjacent to the disc. The distribution device includes a fairing element in which a first opening is formed, extending along a first fairing plane. The fairing element covers the first portion of the outlet tube. Figure to be published with the abbreviation: Fig. 1]

Description

Title of the invention: Improved agricultural product distribution device

[0001] The present invention relates to the field of agricultural machinery and in particular to agricultural seed drills.

[0002] The invention relates more specifically to a seed distribution device for an agricultural machine such as a precision seed drill, the distribution device comprising a housing, a seed inlet provided in the housing, a perforated and driven disc to transport the seeds along a circular path, an outlet tube transporting the seeds from the housing to a furrow of an agricultural plot, the seeds being transported from a reservoir located in the housing to the outlet tube, by means of an air pressure difference on either side of the disc, the air pressure difference being interrupted in an outlet zone near the outlet tube, so that the seeds leave the disc to reach the outlet tube, the outlet tube comprising a first portion into which the seeds enter via an inlet,This first portion of the output tube is located inside the casing and is oriented so that the inlet is adjacent to the disc.

[0003] A distribution device of the type described above is known from document EP 3329758 AL. In the distribution device of this document, a tube is mounted in a pressure chamber located inside the distribution housing. The tube's inlet is positioned near the distribution disc. The upper portion of the tube includes its inlet. This tube inlet is located in an area where pressure flows are critical. The mere presence of the tube in the chamber can significantly disrupt these pressure flows. The tube's prominence in the chamber generates turbulence, which prevents optimal flow management. During operation, some seeds do not reach or enter the tube at the disc outlet. They accumulate in the chamber and are therefore not deposited in the soil. These seeds remain trapped between the tube and the pressure chamber, disrupting the regularity of the distribution.A deterioration in pressure flow leads to a decrease in the regularity and therefore the quality of sowing.

[0004] The present invention aims to reduce or even eliminate at least one of the aforementioned disadvantages.

[0005] To this end, it relates to a seed distribution device for an agricultural machine such as a precision seed drill, the distribution device comprising a housing, a seed inlet provided in the housing, a perforated disc driven to transport the seeds along a circular path, a output tube transporting seeds from the housing to a furrow in an agricultural plot, the seeds being transported from a reservoir located in the housing to the output tube by means of an air pressure difference on either side of the disc, the air pressure difference being interrupted in an outlet zone near the output tube, so that the seeds leave the disc to join the output tube, the output tube comprising a first portion into which the seeds enter via an inlet, this first portion of the output tube being located inside the housing and being oriented so that the inlet is adjacent to the disc, characterized in that the distribution device comprises a fairing element in which a first opening is provided extending along a first fairing plane, and in that the fairing element covers at least partially the first portion of the output tube.Thanks to the fairing element at the tube, seeds no longer get stuck in unfavorable places in the housing. They fall back into the seed hopper when they don't enter the tube at the disc outlet.

[0006] The invention also relates to an agricultural machine comprising this distribution device.

[0007] The invention will be better understood from the following description, which relates to a preferred embodiment, given by way of non-limiting example, and explained with reference to the accompanying schematic drawings, in which:

[0008] [Fig. 1] is a perspective view of a distribution device according to the preferred embodiment of the invention,

[0009] [Fig.2] is a perspective view according to another orientation of the distribution device of the [Fig.1].

[0010] [Fig.3] is a front view of the distribution device of the [Fig.1] where some components are obscured.

[0011] [Fig.4] is a detailed view of the distribution device of [Fig.1] where some components are obscured.

[0012] [Fig.5A] is a detailed view according to another orientation of the distribution device of [Fig.1] where some components are obscured.

[0013] [Fig.5B] is a detail view according to another orientation of the distribution device of the [Fig.1] according to another embodiment.

[0014] [Fig.5C] is a detail view according to another orientation of the distribution device of the [Fig.l] according to another embodiment.

[0015] [Fig.6] is a detailed view of the distribution device of [Fig.1] where some components are obscured.

[0016] [Fig.7] is a detailed cross-sectional view of the distribution device of [Fig.1] where some components are obscured.

[0017] [Fig.8] is a detailed cross-sectional view according to another orientation of the distribution device of [Fig.1] where some components are obscured.

[0018] [Fig.9] is a view of a single outlet tube.

[0019] [Fig. 10] is a cross-sectional view of the outlet tube alone of [Fig.9].

[0020] [Fig. 11 A] and [Fig. 1 IB] are two detailed views of a component of the device distribution of the invention.

[0021] [Fig. 12] is an overall view of an agricultural machine, here a single-seed drill, which may include at least one distribution device according to the invention.

[0022] The invention relates to a seed distribution device (1) for an agricultural machine (2) such as a precision seed drill, the distribution device (1) comprising a housing (3), a seed inlet (4) provided in the housing (3), a perforated disc (5) driven to transport the seeds along a circular path, an outlet tube (7) transporting the seeds from the housing (3) to a furrow of an agricultural plot, the seeds being transported from a reservoir (8) located in the housing (3) to the outlet tube (7) by means of an air pressure difference on either side of the disc (5), the air pressure difference being interrupted in an outlet zone (18) near the outlet tube (7), so that the seeds leave the disc (5) to reach the outlet tube (7), the outlet tube (7) comprising a first portion (9) into which the seeds enter via an inlet (10),this first portion (9) of the outlet tube (7) being located inside the housing (3) and being oriented so that the inlet (10) is adjacent to the disc (5), characterized in that the distribution device (1) comprises a fairing element (11) in which a first opening (21) is provided, extending along a first fairing plane (23), and in that the fairing element (11) at least partially covers the first portion (9) of the outlet tube (7).

[0023] As shown in Figures 1 and 2, the distribution device (1) comprises the housing (3) to which the outlet tube (7) is connected. The outlet tube (7) allows the metered seeds from the distribution device (1) to be transported to a furrow in an agricultural plot in a controlled and regular manner.

[0024] The seeds to be dosed using the distribution device (1) are initially stored in a seed hopper (20A), visible in [Fig. 12].

[0025] It is also possible to dose other particulate agricultural products other than seeds with the distribution device (1), for example granular fertilizer.

[0026] The agricultural product to be metered for the distribution device (1) can be supplied via a seed hopper (20A) located near the distribution device (1), or via a fertilizer hopper (20B) located away from the distribution device (1). These two hoppers (20A; 20B) are visible in [Fig. 12]. In an alternative embodiment not shown, the seed hopper (20A) is located away from the distribution device (1). Similarly, in an unrepresented variant, the fertilizer hopper (20B) is located near the distribution device (1).

[0027] Figure 3 shows the housing (3) of the distribution device (1) without its cover, revealing the disc (5). The disc (5) is mounted and rotated inside the housing (3) around an axis of rotation (6) and transports the seeds along a circular path, using perforations forming a circle concentric with the disc (5). The perforations extend around the circumference of the disc (5). Thus, each seed is selected by the disc (5) at the level of the reservoir (8) and is transported to the outlet tube (7) by means of a pressure difference between the two faces of the disc (5).

[0028] The housing (3) consists of two detachable parts: a housing base and a cover. The cover is attached to the housing base by means of a rotation, for example, of one-eighth of a turn, in notches. The rotation for attaching the cover is around an axis (not shown) parallel to or coinciding with the axis of rotation (6) of the disk (5). Other lockable and removable fastening solutions are also possible, such as quarter-turn screws or toggle-type fasteners. Access to the components inside the housing, for example, the disk (5), is possible via the removable cover.

[0029] Figure 4 is a detailed view of the interior of the distribution device (1). The disc (5) has been removed to show the seed inlet (4) in the housing (3). This inlet transfers the seeds from the seed hopper (20A) to the reservoir (8) located at the bottom of the housing (3). During operation of the distribution device (1), the seeds are transported from the reservoir (8) along a circular path formed by the rotation of the disc (5). A pressure difference (positive or negative) across the disc (5) allows the seeds to settle onto the perforations provided on the disc (5) and be transported to the inlet (10) of the outlet tube (7). The pressure difference can be generated by an air source such as a hydraulically driven turbine mounted on the agricultural machine (2). This air source is then connected to each distribution device (1) via one or more dedicated lines.

[0030] Figure 8 is a cross-sectional view of the distribution device (1). It shows the step of transferring the seeds from the disc (5) to the outlet tube (7). This step takes place in an outlet zone (18) of the distribution device (1). The seeds leave the rotating disc (5) by means of a pressure differential interruption means (not shown). The interruption means can be in the form of a smooth wheel mounted in the housing (3) and pressed against the disc (5). The interruption means interrupts the pressure difference between the two sides of the disc (5) and thus causes the seeds to fall into the outlet tube (7). Thanks to this As a means of interruption, the seeds always leave the disc (5) at the same point, preferably above the inlet of the outlet tube (7). Other means of interrupting the pressure difference are conceivable, such as a pad or a spiked wheel pressed against the disc (5).

[0031] Once the seeds leave the disc (5) after the interruption of the pressure differential, they enter the outlet tube (7) via its inlet (10). A first portion (9) of the outlet tube (7) is located inside the housing (3) and is oriented so that the inlet (10) is adjacent to the disc (5). The advantage of the position of the inlet (10) relative to the disc (5) is that it ensures efficient transfer of the seeds into the inlet (10) after they have left the disc (5). The closer the inlet (10) of the outlet tube (7) is located to the disc (5), the lower the risk that the seeds will not enter the tube (7) after leaving the disc (5). The proximity of the inlet (10) to the disc (5), in particular to the point of seed ejection, ensures a direct transfer of the seed into the outlet tube (7) and into the furrow, to obtain precise and regular sowing.

[0032] The trajectory and velocity of the seeds exiting the disc (5) are crucial for ensuring consistent sowing. The placement of the inlet (10) of the outlet tube (7) allows for better control of this product flow exiting the disc (5). The seeds exiting the disc are channeled into the outlet tube (7) after passing through the inlet (10). The more precisely the product flow is controlled, the more consistent and accurate the sowing will be, guaranteeing a constant spacing of seeds in the furrow.

[0033] According to an important feature of the invention, the distribution device (1) comprises a fairing element (11) in which a first opening (21) is formed, extending along a first fairing plane (23), and the fairing element (11) at least partially covers the first portion (9) of the outlet tube (7). Thanks to the fairing element (11) covering the space around the inlet (10), the seeds are guided directly to the outlet tube (7), and consequently, the accuracy of the sowing operation is ensured. On the other hand, if the seed does not reach the inlet (10) of the outlet tube (7), the seed goes directly to the reservoir (8) and can be reused without being damaged. Indeed, the seeds which fall back into the reservoir (8) do not get stuck in a space located around the outlet tube (7), because this space is filled by the fairing element (11).The seeds slide easily and without obstruction towards the reservoir (8), which ensures that they can be used again later by the distribution device (1). The combination of the inlet (10) of the outlet tube (7) close to the disc (5) and the fairing element (11) located around the first portion (9) of the outlet tube (7) improves the regularity of the seed flow within the distribution device (1).

[0034] Figure 5A is a similar view to Figure 4, but from a different orientation. This figure illustrates more specifically the internal part of the distribution device (1), and in particular the fairing element (11). Thanks to this fairing element (11), the flow of pressure and seeds inside the housing (3) is better controlled. The fairing element (11) guides the seeds towards the inlet (10) of the outlet tube (7). In some cases, the fairing element (11) guides the seeds directly to the reservoir (8) if they do not reach the inlet (10). With the fairing element (11), the seeds do not become stuck or damaged, since they are transferred directly to the reservoir (8). The risk of seeds that fail to reach the inlet (10) getting stuck in the housing (3) or damaged is greatly reduced, or even completely eliminated.

[0035] Figure 6 illustrates in more detail the fairing element (11) that covers the first portion (9) of the outlet tube (7). The fairing element (11) is, for example, a contoured housing designed to cover the first portion (9). A first opening (21) is formed in the fairing element (11) and oriented along the first fairing plane (23). The first opening (21) is at least aligned with the inlet (10) of the tube (7) and allows the passage of seeds into the outlet tube (7), while allowing the fairing element (11) to cover the first portion (9) of the tube (7).

[0036] The curvature and general shape of the outlet tube (7) are shown in detail in Figures 9 and 10. The angular orientation of the outlet tube (7) is designed so that seeds entering through the inlet (10) encounter the inner wall of the outlet tube (7) as little as possible. Limiting the number of bounces of the seeds during their passage through the outlet tube (7) allows for better control of their spacing and regularity as they exit the outlet tube (7) into the soil. Similarly, controlling the trajectory of the seeds through the tube also allows for better control of their speed during transport. Therefore, the upper part of the outlet tube (7) is inclined, both so that the inlet (10) is as close as possible to the disc (5) and the outlet zone (18), and so that the seeds entering the tube experience as few shocks and / or bounces as possible during their subsequent journey.Advantageously, the inclination of the upper part of the tube (7) is achieved by means of a curve relative to the main axis of the tube (7). Preferably, the angle of this curve is between 5 and 15° relative to the main axis of the tube (7). The outlet tube (7) has a generally cylindrical shape, but other profiles (not shown) are possible, for example, a triangular shape, in order to guide the seeds with a chute effect. Similarly, different diameters of outlet tubes (7) are possible, particularly depending on the variations in seed size according to the plants and / or varieties to be sown.

[0037] The first portion (9) of the outlet tube (7) is located inside the housing (3). The first portion (9) is an integral part of the outlet tube (7) as shown in Figures 9 and 10. As can be seen in Figures 5A, 5B, 5C, 6, and 8, the fairing element (11) covers the first portion (9) of the outlet tube (7). This feature has the advantage of preventing the outlet tube (7) from protruding alone, and therefore without the fairing element (11), inside the housing (3). This allows the fairing element (11) to guide the flow of pressure and seeds inside the housing (3), without any protrusion of the outlet tube (7) forming an obstruction. The pressure flows guided by the fairing element (11) are thus devoid of turbulence due to the shapes of the fairing element (11), which limits the consumption of pressurized air of the distribution device (1).Seeds that do not fit into the inlet (10) of the outlet tube (7) are guided by the fairing element (11) directly to the reservoir (8) without being damaged, making them usable again later during the sowing operation.

[0038] According to another variant not shown, the outlet tube (7) can be an integral part of the housing (3) and include an insert of a shape similar to the first portion (9) of the outlet tube (7) described above, fitted onto the outlet tube (7).

[0039] According to another advantageous feature of the invention shown in [Fig. 6], the fairing element (11) comprises a second opening (22) extending into a second fairing plane (24), the first fairing plane (23) and the second fairing plane (24) being intersecting. Preferably, they are oriented at an angle between 45° and 170°. This angle partly defines the shape of the fairing element. Advantageously, the second fairing plane (24) is substantially parallel to the disc (5). The presence of the second opening (22) oriented along the second fairing plane (24) has the advantage of reducing wear on the fairing element (11) in the event that it is in contact with the rotating disc (5).Limiting the wear of the fairing element (11) also limits the maintenance required on the distribution device (1), which has the advantage of reducing the number, duration, complexity and cost of maintenance operations on the distribution device (1).

[0040] Another advantage of the fairing element (11) is that it greatly reduces, or even completely eliminates, some of the turbulence in the pressure flows within the distribution device (1). Thanks to the fairing element (11) of the invention, the seeds ejected from the disc are guided towards the tube and are not subjected to disturbances. The pressure flows within the distribution device (1), and more particularly around the fairing element (11), exhibit little or no turbulence, due to the presence of the fairing element (11) around the first portion (9) of the outlet tube (7). This feature makes it possible to reduce the air consumption of the distribution device (1) and thus requiring a less substantial and therefore less expensive air source (such as a hydraulic turbine).

[0041] According to an advantageous feature of the invention shown in Figures 4 and 5A, the fairing element (11) is an integral part of the housing (3) of the distribution device (1). In this case, the fairing element (11) is integrated directly into the shape of the housing (3). This feature offers, in particular, industrialization advantages, such as limiting the number of components within the distribution device (1) and thus reducing production costs and the number of spare parts to be managed by the manufacturer.

[0042] According to another embodiment illustrated in [Fig. 5B], the fairing element (11) is a separate part from the housing (3) of the distribution device (1), the fairing element (11) preferably being removable from the housing (3). Such an embodiment allows the fairing element (11) to be easily removed and reinstalled during maintenance or cleaning of the distribution device (1).

[0043] Furthermore, such a variant also allows the operator to use a fairing element (11) with different shapes and / or characteristics depending on the application of the distribution device (1). Indeed, the different types of agricultural products that can be used have different sizes, profiles, and characteristics, and depending on the configuration of the distribution device (1), it may be advantageous to have a fairing element (11) that is wider or narrower, straight or curved, in order to facilitate the flow of seeds around the fairing element (11). It is thus possible to adapt the fairing element (11) to the type of seeds to be distributed, as part of an operation to modify the configuration of the distribution device (1). Usually, this operation also involves changing the disc (5) in order to obtain optimal operation of the distribution device (1).

[0044] Figures 9 and 10 highlight another advantageous feature of the invention, namely that the inlet (10) is oriented along at least two intersecting planes (13; 14). These two planes (13; 14) are distinct from each other and allow for the formation of an inlet (10) in the outlet tube (7), which accommodates its inclination. These two planes (13; 14) also facilitate the entry of seeds into the outlet tube (7) compared to an inlet (10) inclined along a single plane. The plane (14), advantageously located higher than the plane (13), effectively channels seeds that may have an upward exit trajectory, while the plane (13) allows the inlet (10) to be close to the disc (5). Advantageously, the two planes (13; 14) are oriented at an angle between 120° and 170°, ideally between 150° and 160°. Plane (13) is advantageously substantially horizontal and perpendicular to disk (5).

[0045] According to another advantageous feature of the invention, visible among others in Figures 5A, 6 and 8, the fairing element (11) has at least one upper face (15) substantially parallel and / or coplanar with one of the planes (13; 14). This feature allows the fairing element (11) to conform more closely to the shape of the first portion (9) of the outlet tube (7), and in particular to the inlet (10). Thus, the management of pressure and seed flow within the distribution device (1) is improved, as described above.

[0046] The upper face (15) of the fairing element (11) guides the seeds towards the inlet (10) of the outlet tube (7). The other faces of the fairing element (11) are oriented to facilitate the flow of seeds that do not enter the outlet tube (7) towards the reservoir (8). Since the reservoir (8) is located lower than the inlet (10) of the outlet tube (7) within the housing (3), the fairing element (11) includes at least one face oriented substantially vertically to form a ramp for the flow of seeds towards the reservoir (8) in the event that they do not enter the inlet (10).

[0047] All or some of the angles between the different faces of the fairing element (11) and with the housing (3) are obtuse in order to facilitate the flow of seeds towards the inlet (10) or towards the reservoir (8), while avoiding the formation of cavities or recesses where the seeds could otherwise get stuck.

[0048] All or some of the edges between the different faces of the fairing element (11) may have fillets or chamfers. These fillets or chamfers allow the seeds to pass easily and without impact. The facilitated passage of seeds over the surfaces of the fairing element (11) helps to maintain their integrity and prevents damage.

[0049] The fairing element (11) may further comprise different faces which allow it to conform as closely as possible to the shape of the first portion (9) of the outlet tube (7). These faces may be flat, as can be seen, among others, in Figures 5A, 5B, 6 and 8.

[0050] According to another embodiment not shown, some or all of the faces of the fairing element (11) may be curved to form rounded, concave and / or convex surfaces.

[0051] According to another embodiment illustrated in [Fig. 5C], it is possible for the inlet (10) of the outlet tube (7) to be oriented along a single plane (13). Similarly, according to this embodiment, the fairing element (11) has an upper face (15) substantially parallel and / or coplanar to the plane (13).

[0052] According to another advantageous feature of the invention, visible in particular in Figures 5A, 6, and 8, the fairing element (11) has a rounded edge and / or a chamfer (16) adjacent to at least a portion of the circumference of the inlet (10). This feature facilitates the entry of seeds into the inlet (10). while avoiding damaging them. Advantageously, the rounded edge and / or chamfer (16) is adjacent to the first opening of the fairing element (21), and opposite the second opening of the fairing element (22). In this way, the rotation of the disc (5) will not wear the rounded edge and / or chamfer (16).

[0053] According to another advantageous feature of the invention, visible among other things in Figures 8 to 10, at least a portion of the circumference of the inlet (10) of the outlet tube (7) has a rounded edge and / or a chamfer (17). This feature, alone or in combination with that described in the preceding paragraph, also facilitates the entry of seeds into the inlet (10) without damaging them. Advantageously, the rounded edge and / or the chamfer (17) is opposite the side (12) of the first portion (9) of the outlet tube (7). In this way, the rotation of the disc (5) will not wear down the rounded edge and / or the chamfer (17).

[0054] Figure 7 shows a perspective view of the distribution device (1), with The housing (3) and the disc (5) are shown, but the opposite side of the disc (5) is visible, i.e., the side where the seeds come into contact with the perforations of the disc (5). The housing (3) includes a blade (19) mounted on or forming an integral part of the housing (3). The purpose of the blade (19) is to facilitate seed engagement with the disc (5), preventing clogging and / or agglomeration on the perforations of the disc (5). The blade (19) has an arched shape that gradually approaches the edge of the perforations as the seeds, and therefore the perforations of the rotating disc (5), progress in their circular path. Thanks to this particular shape, the blade (19) prevents several seeds from agglomerating on the same perforation and forming a duplicate during sowing. Duplicates are to be avoided, as they mean that two seeds are in the same position in the furrow at the time of sowing.The blade (19) is located very close to the disc (5) or may be in contact with the disc (5) for maximum efficiency. Furthermore, the blade (19) is positioned so that it begins at the level of the seed reservoir (8), that is, near the bottom of the housing (3). Advantageously, the blade (19) is positioned so that it begins in the lower half of the disc (5)'s footprint. Advantageously, the blade (19) is positioned so that it ends in the upper half of the disc (5)'s footprint. This position and the shape of the blade (19) prevent clogging or agglomeration of the seeds while they are awaiting rotation of the disc (5) in the reservoir (8) and when they come into contact with the perforations of the disc (5).

[0055] Figures 1 IA and 1 IB show views of the blade (19) alone, in two orientations. As illustrated in these figures, the blade (19) may have at least one removable fastening means allowing it to be easily removed and reinstalled in the housing (3). This removable fastening means may be one or more screws. and / or one or more fixing clips, as well as other variants known in the field of mechanical engineering. A removable blade fixing (19) allows for a range of several replaceable blades (19) depending on the use of the distribution device (1). Indeed, different types of agricultural products with different characteristics (dimensions, shapes, adhesion, etc.) may require adapted shapes of the blade (19) for optimal efficiency. These adapted shapes include, for example, a larger or smaller radius of curvature of the blade (19), a more or less gradual curvature between its two ends (for example, with a radius of curvature that varies between the two ends), the overall dimensions of the blade (height, width, thickness, etc.), the number of perforations in the disc (5) affected by the blade (19) along the circular path of the seeds, etc.

[0056] Figure 12 represents an agricultural machine (2) capable of accommodating at least A distribution device (1) with the advantageous characteristics described above. In this case, it is a precision seeder, also called a single-seed drill. In [Fig. 12], it is a seeder with six single-seed units. Each seed unit is equipped with at least one distribution device (1) located between the seed hopper and the tillage and / or seeding units that are in contact with the soil.

[0057] Of course, the invention is not limited to the embodiments described and shown in the accompanying drawings. Modifications remain possible, particularly with regard to the composition of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

Demands

1. Seed distribution device (1) for an agricultural machine (2) such as a precision seed drill, the distribution device (1) comprising a housing (3), a seed inlet (4) provided in the housing (3), a perforated disc (5) driven to transport the seeds along a circular path, an outlet tube (7) transporting the seeds from the housing (3) to a furrow in an agricultural plot, the seeds being transported from a reservoir (8) located in the housing (3) to the outlet tube (7) by means of an air pressure difference on either side of the disc (5), the air pressure difference being interrupted in an outlet zone (18) near the outlet tube (7), so that the seeds leave the disc (5) to reach the outlet tube (7), the outlet tube (7) comprising a first portion (9) into which the seeds enter via an inlet (10),this first portion (9) of the outlet tube (7) being located inside the housing (3) and being oriented so that the inlet (10) is adjacent to the disc (5), characterized in that the distribution device (1) comprises a fairing element (11) in which a first opening (21) is provided, extending along a first fairing plane (23), and in that the fairing element (11) at least partially covers the first portion (9) of the outlet tube (7).

2. Distribution device according to claim 1, characterized in that the fairing element (11) comprises a second opening (22) extending along a second fairing plane (24), the first fairing plane (23) and the second fairing plane (24) being intersecting.

3. Distribution device according to any one of the preceding claims, characterized in that the fairing element (11) is an integral part of the housing (3) of the distribution device (1).

4. Distribution device according to claim 1 or 2, characterized in that the fairing element (11) is a separate part from the housing (3) of the distribution device (1), the fairing element (11) preferably being removable from the housing (3).

5. Dispensing device according to any one of the preceding claims, characterized in that the inlet (10) is oriented along at least two intersecting planes (13; 14).

6. Distribution device according to claim 5, characterized in that the fairing element (11) has at least one upper face (15) substantially parallel and / or coplanar with one of the planes (13; 14).

7. Dispensing device according to any one of the preceding claims, characterized in that the fairing element (11) has a rounded edge and / or a chamfer (16) adjacent to at least a part of the circumference of the inlet (10).

8. Distribution device according to any one of the preceding claims, characterized in that at least a part of the circumference of the inlet (10) of the outlet tube (7) has a rounded edge and / or a chamfer (17).

9. Agricultural machine (2) comprising a distribution device (1) according to any one of the preceding claims.

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