Axial flow fan for granary ventilation

Abstract

The utility model relates to an axial flow fan for granary ventilation, which comprises an installation casing, the installation casing is hexagonal, the side wall of the installation casing is provided with a connecting rod penetrating through the installation casing, one end of the connecting rod inserted into the installation casing is provided with a linkage gear, and a hexagonal connecting rod is arranged in the installation casing. The utility model relates to the technical field of granary ventilation equipment. According to the axial flow fan for ventilation of the granary, when wind blows to the side walls of the fan blade fixing plates in the wind outlet direction of the fan, thrust generated by wind power pushes the fan blade fixing plates to deflect, so that the air included angle between the fan blade fixing plates and the back sides of the fan blades is decreased, and then the situation that a large included angle is generated between the back sides of the fan blades and incoming flow on the back sides of the fan blades can be prevented; the vortex is effectively prevented from being generated at the included angle between the incoming flow on the back side of the fan blade and the back side of the fan blade, the airflow can be tightly attached to the fan blade, and the situation that the fan stalls is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of granary ventilation equipment, in particular to an axial flow fan for granary ventilation. Background Art

[0002] Axial flow fans are usually placed above the walls of grain warehouses to exhaust hot dry air or humid air in the grain warehouse. The position of axial flow fans is relatively fixed and can move the air to form an airflow in the same direction as the axis of the fan blades. For example, electric fans and air conditioner outdoor fans are axial flow fans. They are called "axial flow" because the gas flows parallel to the fan axis. Axial flow fans are usually used in situations where the flow requirements are higher and the pressure requirements are lower. They are widely used.

[0003] In the prior art, most of the axial flow fans used in granaries have blades that are fixed on the outer surface of the rotating shaft. When the external wind blows vertically toward the fan outlet, the angle between the incoming flow received by the blades and the blades will increase. When this angle is too large, the airflow on the leeward surface of the blades will separate from the surface of the blades and generate vortices on the back of the blades, causing the fan to stall. At this time, the fan speed will decrease and the airflow cannot be effectively discharged, which will have a great impact on the ventilation of the granary. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the present utility model is to provide an axial flow fan for grain silo ventilation, so as to solve the technical problems mentioned in the above background technology.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] An axial flow fan for grain silo ventilation, comprising a mounting casing, the mounting casing is hexagonal, a side wall of the mounting casing is provided with a connecting rod penetrating the mounting casing, one end of the connecting rod inserted into the mounting casing is provided with a linkage gear, a hexagonal connecting rod is provided inside the mounting casing, and the side wall of the hexagonal connecting rod is rotatably connected to the connecting rod one by one;

[0007] A blade fixing plate is fixedly provided at one end of the connecting rod located on the outside of the mounting casing, soft wind guide plates are slidably provided on both sides of the blade fixing plate, and an electric telescopic table is provided on the side wall of the blade fixing plate, a conical table is provided at one end of the mounting casing, a transmission device is sleeved on the middle part of the hexagonal connecting rod, an elastic rotating shaft fixed to the connecting rod is provided on one side surface of the hexagonal connecting rod, a driving motor is fixedly provided at one end of the hexagonal connecting rod, and a fixed conical table is provided on the outer surface of the driving motor.

[0008] Furthermore, a mounting bracket is provided on one side of the fixed frustum and the frustum close to the mounting housing, and the support rods of the mounting bracket are both arc-shaped.

[0009] Furthermore, the transmission device includes a fixing ring, which is fixedly arranged on the outer surface of the hexagonal connecting rod, and a bevel gear ring is rotatably arranged on the outer surface of the fixing ring, and the bevel gear ring is meshed with the linkage gear.

[0010] Furthermore, the soft air guide plate includes two elastic soft plates, and the opposite ends of the two elastic soft plates are connected to each other. The two elastic soft plates are respectively slidably connected to both sides of the same end of the fan blade fixing plate, and are connected to the telescopic end of the electric telescopic table.

[0011] Furthermore, the outer side wall of the mounting housing is provided with two arc-shaped grooves, and the two arc-shaped grooves are symmetrically arranged with respect to the central axis of the mounting housing, and the center of the arc-shaped groove coincides with the axis center line of the connecting rod.

[0012] Furthermore, guide rods are provided on both sides of the bottom end of the fan blade fixing plate and are respectively inserted into the two arc-shaped grooves.

[0013] In summary, the present invention includes at least one of the following beneficial technical effects:

[0014] 1. In this axial flow fan for grain silo ventilation, when wind blows toward the side wall of the blade fixing plate in the air outlet direction of the fan, the thrust generated by the wind pushes the blade fixing plate to deflect, so that the air angle between the blade fixing plate and the back of the blade becomes smaller, thereby preventing the back of the blade from generating a large angle with the incoming flow on the back of the blade, effectively avoiding the generation of vortices at the angle between the incoming flow on the back of the blade and the back of the blade, and the airflow can fit the blade more closely, thereby avoiding the fan from stalling;

[0015] 2. This axial flow fan for grain silo ventilation can be extended and retracted to different lengths through the electric extension tables on both sides of the fan blade fixing plate, and the angle of the connection between the two elastic soft plates can be adjusted. When the fan blade fixing plate is deflected at an angle, the angle between the edge of the soft air guide plate and the wind direction of the fan remains unchanged, so as to achieve the effect of keeping the total incoming flow direction unchanged. When the total incoming flow direction remains unchanged, the angle of the fan blade fixing plate changes, so as to reduce the angle between the back side of the fan blade fixing plate and the incoming flow on the back side of the fan blade, thereby achieving the effect of avoiding the generation of eddy currents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 The utility model is a wind direction schematic diagram of an axial flow fan for grain silo ventilation.

[0018] Figure 2 The utility model is a structural schematic diagram of an axial flow fan for grain silo ventilation.

[0019] Figure 3 The utility model is a front structural schematic diagram of an installation casing of an axial flow fan for grain silo ventilation.

[0020] Figure 4 The utility model is a schematic diagram of the back structure of an installation casing of an axial flow fan for grain silo ventilation.

[0021] Figure 5 The utility model is a schematic structural diagram of a transmission device of an axial flow fan for grain silo ventilation.

[0022] Figure 6 The utility model is a structural schematic diagram of a soft air guide plate of an axial flow fan for grain silo ventilation.

[0023] In the figure, 1. mounting housing; 2. connecting rod; 3. linkage gear; 4. hexagonal connecting rod; 5. soft air guide plate; 6. electric telescopic table; 7. conical table; 8. transmission device; 81. fixing ring; 82. conical gear ring; 9. elastic rotating shaft; 10. driving motor; 11. fixing conical table; 12. mounting bracket; 13. elastic soft plate; 14. arc groove; 15. guide rod; 16. fan blade fixing plate. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0025] Example:

[0026] Reference Figure 1-Figure 6 The utility model discloses an axial flow fan for grain silo ventilation, comprising a mounting casing 1, the mounting casing 1 is hexagonal, the side wall of the mounting casing 1 is provided with a connecting rod 2 penetrating the mounting casing 1, one end of the connecting rod 2 inserted into the mounting casing 1 is provided with a linkage gear 3, the interior of the mounting casing 1 is provided with a hexagonal connecting rod 4, and the side wall of the hexagonal connecting rod 4 is rotatably connected with the connecting rod 2 one by one;

[0027] A blade fixing plate 16 is fixedly provided at one end of the connecting rod 2 located on the outside of the mounting casing 1, soft wind guide plates 5 are slidably provided on both sides of the blade fixing plate 16, and the side walls of the blade fixing plate 16 are provided with an electric telescopic table 6, a conical table 7 is provided at one end of the mounting casing 1, a transmission device 8 is sleeved on the middle part of the hexagonal connecting rod 4, an elastic rotating shaft 9 fixed to the connecting rod 2 is provided on one side of the hexagonal connecting rod 4, a driving motor 10 is fixedly provided at one end of the hexagonal connecting rod 4, and a fixed conical table 11 is provided on the outer surface of the driving motor 10.

[0028] In this embodiment, when in use, the hexagonal connecting rod 4 is driven to rotate by the driving motor 10. Since the connecting rod 2 is inserted into the mounting housing 1 and is rotatably connected to the hexagonal connecting rod 4, when the hexagonal connecting rod 4 is driven by the driving motor 10, the mounting housing 1 and the fan blade fixing plate 16 can be driven to rotate, so as to achieve the effect of promoting air movement.

[0029] Furthermore, since the connecting rod 2 is rotatably connected to the mounting housing 1 and the hexagonal connecting rod 4, the fan blade fixing plate 16 can be deflected at an angle during the rotation process. The angle of the fan blade fixing plate 16 is maintained at a fixed angle by the setting of the elastic rotating shaft 9. The connecting rods 2 at various locations are transmission-connected by the setting of the transmission device 8 and the linkage gear 3, so that the deflection angles of the fan blade fixing plates 16 at various locations are equal, which is used to improve the stability of the fan blades during rotation.

[0030] In the prior art, the air from the outside blowing in the wind direction of the fan blows toward the fan blades, and the pressure on the front side of the fan blades will increase, while the pressure on the back side of the fan blades will decrease. At this time, the angle A1 between the incoming flow on the back side of the fan blades and the fan blades will increase, and vortices will be generated at the position between the incoming flow on the back side of the fan blades and the back side of the fan blades. At this time, the vortices will reduce the lift on the fan blades and increase the resistance of the fan blades, which will seriously slow down the rotation speed of the fan blades, causing the fan to stall and fail to push the air to move.

[0031] When wind blows toward the side wall of the fan blade fixing plate 16 in the air outlet direction of the fan, Figure 1 , A, fan wind direction; B, total incoming flow; C, incoming flow through the front of the fan blade; D, incoming flow through the back of the fan blade; E, incoming flow from the outside to the fan; A1, D and the angle between the fan blade, the thrust generated by the wind pushes the fan blade fixing plate 16 to deflect, at this time the air angle A1 between the fan blade fixing plate 16 and the back of the fan blade will become smaller, thereby preventing the back of the fan blade from having a large angle with the incoming flow on the back of the fan blade, effectively avoiding the generation of vortices at the angle between the incoming flow on the back of the fan blade and the back of the fan blade, and the airflow can fit the fan blade more closely, so as to avoid the fan from stalling;

[0032] At the same time, through the setting of the electric telescopic platform 6, after the fan blade fixing plate 16 is deflected, the soft air guide plate 5 is pushed to move, so that the position of the edge of the soft air guide plate 5 remains in place, avoiding changes in the wind inlet angle of the air on the back side of the fan.

[0033] In a further preferred embodiment of the present invention, Figure 1-6 As shown, the fixed cone 11 and the cone-shaped cone 7 are both provided with mounting brackets 12 on one side close to the mounting housing 1, and the support rods of the mounting brackets 12 are both arc-shaped.

[0034] In this embodiment, the mounting bracket 12 is used to mount the mounting housing 1, the drive motor 10 and the fixed cone 11 of the fan, and the arc-shaped arrangement of the support rod is used to block the air flow, thereby achieving the effect of improving the smoothness of the air flow.

[0035] In a further preferred embodiment of the present invention, Figure 1-6 As shown, the transmission device 8 includes a fixing ring 81 , which is fixedly arranged on the outer surface of the hexagonal connecting rod 4 , and a bevel gear ring 82 is rotatably arranged on the outer surface of the fixing ring 81 , and the bevel gear ring 82 is meshed with the linkage gear 3 .

[0036] In this embodiment, the fixing ring 81 is provided to rotatably connect the bevel gear ring 82 with the hexagonal connecting rod 4. When the wind force drives the blade fixing plate 16 to rotate, the connecting rod 2 rotates, and then cooperates with the bevel gear ring 82 and the linkage gear 3 to make the connecting rods 2 at each position rotate synchronously.

[0037] In a further preferred embodiment of the present invention, Figure 1-6 As shown, the soft air guide plate 5 includes two elastic soft plates 13, and the opposite ends of the two elastic soft plates 13 are connected to each other. The two elastic soft plates 13 are respectively slidably connected to the two sides of the same end of the fan blade fixing plate 16, and are connected to the telescopic end of the electric telescopic platform 6.

[0038] In this embodiment, since the soft air guide plate 5 is composed of two elastic soft plates 13 connected to each other, when the electric telescopic table 6 on both sides of the blade fixing plate 16 is extended and retracted to different lengths, the angle of the connection between the two elastic soft plates 13 can be adjusted, so that when the blade fixing plate 16 produces an angular deflection, the angle between the edge of the soft air guide plate 5 and the wind direction of the fan remains unchanged, so as to achieve the effect of keeping the total incoming flow direction unchanged. When the total incoming flow direction remains unchanged, the angle of the blade fixing plate 16 changes, so as to reduce the angle between the back side of the blade fixing plate 16 and the incoming flow on the back side of the blade, thereby achieving the effect of avoiding the generation of eddy currents.

[0039] In a further preferred embodiment of the present invention, Figure 1-6As shown, the outer side wall of the mounting housing 1 is provided with two arc grooves 14 , and the two arc grooves 14 are symmetrically arranged with respect to the central axis of the mounting housing 1 , and the center of the arc groove 14 coincides with the axis of the connecting rod 2 .

[0040] In this embodiment, the arc groove 14 is provided to guide the rotation direction of the blade fixing plate 16 .

[0041] In a further preferred embodiment of the present invention, Figure 1-6 As shown, guide rods 15 are provided on both sides of the bottom end of the fan blade fixing plate 16 and are respectively inserted into the two arc-shaped grooves 14.

[0042] In this embodiment, the guide rod 15 is provided in conjunction with the arc groove 14 to limit the rotation direction of the fan blade fixing plate 16, thereby achieving the effect of improving the stability of the fan blade.

[0043] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An axial flow fan for grain silo ventilation, characterized in that: The mounting case (1) comprises a mounting case (1), the mounting case (1) being hexagonal in shape, a connecting rod (2) penetrating the mounting case (1) being provided on a side wall of the mounting case (1), a linkage gear (3) being provided on one end of the connecting rod (2) inserted into the mounting case (1), a hexagonal connecting rod (4) being provided inside the mounting case (1), and a side wall of the hexagonal connecting rod (4) being rotatably connected one by one with the connecting rod (2); A fan blade fixing plate (16) is fixedly provided at one end of the connecting rod (2) located outside the mounting housing (1), soft air guide plates (5) are slidably provided on both sides of the fan blade fixing plate (16), and a side wall of the fan blade fixing plate (16) is provided with an electric telescopic table (6), a conical table (7) is provided at one end of the mounting housing (1), a transmission device (8) is sleeved on the middle part of the hexagonal connecting rod (4), an elastic shaft (9) fixed to the connecting rod (2) is provided on one side surface of the hexagonal connecting rod (4), a driving motor (10) is fixedly provided at one end of the hexagonal connecting rod (4), and a fixed conical table (11) is provided on the outer surface of the driving motor (10).

2. The axial flow fan for grain silo ventilation according to claim 1, characterized in that: A mounting bracket (12) is provided on one side of the fixed cone (11) and the cone-shaped cone (7) close to the mounting housing (1), and the support rods of the mounting bracket (12) are both arranged in an arc shape.

3. The axial flow fan for grain silo ventilation according to claim 2, characterized in that: The transmission device (8) comprises a fixing ring (81), the fixing ring (81) being fixedly arranged on the outer surface of the hexagonal connecting rod (4), a bevel gear ring (82) being rotatably arranged on the outer surface of the fixing ring (81), and the bevel gear ring (82) being meshed with the linkage gear (3).

4. The axial flow fan for grain silo ventilation according to claim 3, characterized in that: The soft air guide plate (5) comprises two elastic soft plates (13), and opposite ends of the two elastic soft plates (13) are connected to each other. The two elastic soft plates (13) are respectively slidably connected to both sides of the same end of the fan blade fixing plate (16), and are connected to the telescopic end of the electric telescopic table (6).

5. The axial flow fan for grain silo ventilation according to claim 4, characterized in that: The outer side wall of the mounting housing (1) is provided with two arc-shaped grooves (14), and the two arc-shaped grooves (14) are symmetrically arranged with respect to the central axis of the mounting housing (1), and the center of the arc-shaped groove (14) coincides with the axis center line of the connecting rod (2).

6. The axial flow fan for grain silo ventilation according to claim 5, characterized in that: Guide rods (15) are provided on both sides of the bottom end of the fan blade fixing plate (16) and are respectively inserted into the two arc-shaped grooves (14).

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