Axial flow fan capable of automatically adjusting direction and speed reducer

Abstract

The utility model provides an axial flow fan capable of automatically adjusting direction and a speed reducer, which belong to the technical field of axial flow fans, and comprise a connecting disc and fan blades, and further comprise fasteners, the fan blades are assembled on the connecting disc through the fasteners, and the fasteners are in a non-completely tightened state so that the fan blades can swing relative to the connecting disc; the tail part of the locking anti-falling component is inserted into the preformed holes of the fan blades and the fastener, and the tail part of the locking anti-falling component is bent towards the two sides. The bidirectional wind power generation device has the beneficial effects that the fan blades and the connecting disc are assembled by adopting the non-completely-tightened fasteners, so that the fan blades can flexibly swing relative to the connecting disc to adapt to the change of the forward rotation and reverse rotation directions of the shaft, and therefore bidirectional wind power generation is achieved, and the bidirectional wind power generation device is suitable for equipment needing forward and reverse rotation operation; meanwhile, the tail portion of the locking anti-disengaging component is inserted into preformed holes of the fan blades and the fastener and is bent towards the two sides, the fan blades and the fastener can be prevented from disengaging in the swinging process, and the reliability and safety of the device are improved while the flexibility of the fan blades is ensured.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, and in particular to an axial flow fan and a speed reducer that can automatically adjust direction. Background Technology

[0002] Based on the direction of airflow during operation, fans are mainly divided into two types: radial fans and axial fans. Axial fans, in particular, propel air in the same direction as the axis of rotation when operating, hence the name. As is well known, the blades of an axial fan form a certain angle with the plane of rotation to achieve the suction and blowing process. However, once the direction of blade oscillation is determined, the direction of airflow is also uniquely determined and cannot be changed.

[0003] As a common power transmission device, speed reducers generate a significant amount of heat during operation, thus requiring efficient cooling systems. Existing speed reducers typically use radial fans for heat dissipation. However, radial fans suffer from drawbacks such as low airflow, poor heat dissipation, and high noise levels, making it difficult to meet the heat dissipation performance requirements of high-power speed reducers. Furthermore, the airflow direction of a radial fan is perpendicular to the rotation axis, resulting in dispersed airflow and low cooling efficiency. Additionally, it tends to generate considerable noise during high-speed rotation, negatively impacting the operating environment of the equipment.

[0004] To address the shortcomings of radial fans, axial fans have been introduced into the gearbox's cooling system. Axial fans can significantly increase airflow velocity and provide greater airflow, thereby significantly improving heat dissipation while reducing operating noise, making them more suitable for noise-sensitive applications.

[0005] However, traditional axial fans can only generate airflow in one direction and are suitable for equipment with a single direction of rotation. For gearboxes that need to operate in both forward and reverse directions, traditional axial fans cannot adapt to changes in the direction of rotation, resulting in unstable cooling performance or even failure. Utility Model Content

[0006] To solve the above technical problems, this utility model provides an axial flow fan with automatic direction adjustment; on the other hand, it also provides a speed reducer.

[0007] The technical problem solved by this utility model can be achieved by the following technical solution:

[0008] The first aspect of this utility model is to provide an axial flow fan with automatic direction adjustment, including a connecting plate and fan blades, and further comprising:

[0009] Fasteners are used to assemble the fan blades onto the connecting disc, wherein the fasteners are in a partially tightened state to allow the fan blades to oscillate relative to the connecting disc.

[0010] A locking anti-detachment component is provided, wherein the tail end of the locking anti-detachment component is inserted into the reserved holes of the fan blade and the fastener, and the tail end is bent to both sides.

[0011] Preferably, the connecting disc is provided with a keyway for mounting an external shaft;

[0012] When the rotation direction of the external shaft changes, the fan blades generate a swing direction relative to the connecting plate under the action of centrifugal force and wind resistance, and the swing direction is related to the change in the rotation direction of the external shaft.

[0013] Preferably, the oscillation direction of the fan blades changes in the opposite direction to the rotation direction of the external shaft.

[0014] Preferably, the connecting plate is provided with a plurality of mounting holes for assembling the fasteners, and the plurality of mounting holes are evenly distributed along the circumference of the connecting plate.

[0015] Preferably, it further includes a limiting portion for limiting the swing range of the fan blade relative to the connecting disc.

[0016] Preferably, the limiting part is disposed on the fan blade and is mounted on the connecting plate.

[0017] Preferably, the fan blade includes a mounting surface facing the side of the connecting plate, and the mounting surface has a notched corner;

[0018] The limiting part is the portion of the assembly surface excluding the missing corner.

[0019] Preferably, the locking and anti-loosening component is a cotter pin.

[0020] Preferably, the fastener is a screw.

[0021] The second aspect of this utility model is to provide a speed reducer, the speed reducer including an output shaft on which an automatically adjustable axial fan as described above is mounted.

[0022] The advantages or beneficial effects of this utility model's technical solution are as follows:

[0023] This invention uses partially tightened fasteners to assemble the fan blades and connecting plate, allowing the fan blades to swing flexibly relative to the connecting plate, adapting to changes in the forward and reverse rotation of the shaft, thereby generating wind power in both directions. It is suitable for equipment that requires forward and reverse operation. At the same time, the tail of the locking and anti-detachment component is inserted into the reserved holes of the fan blades and fasteners and bent to both sides, which can prevent the fan blades and fasteners from falling off during swinging. While ensuring the flexibility of the fan blades, it also improves the reliability and safety of the device. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the structure of an axial flow fan that can automatically adjust direction, which is a preferred embodiment of the present invention.

[0025] Figure 2 This is a top view of an automatically oriented axial fan in a preferred embodiment of the present invention.

[0026] Figure 3 This is a top view of an automatically oriented axial fan rotating counterclockwise, in a preferred embodiment of the present invention.

[0027] Figure 4 In a preferred embodiment of this utility model, Figure 3 A cross-sectional schematic diagram of the blade oscillation during stroke;

[0028] Figure 5 This is a top view of an automatically oriented axial fan rotating clockwise, in a preferred embodiment of the present invention.

[0029] Figure 6 In a preferred embodiment of this utility model, Figure 5 A top view showing a cross-section of the blades swinging in the middle of the stroke.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Fan blade; 2. Connecting disc; 3. Locking and anti-detachment component; 4. Fastener; 5. Keyway; 6. Limiting part. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0035] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, an axial flow fan with automatic direction adjustment is provided, such as... Figure 1 and Figure 2 As shown, including the connecting plate 2 and the fan blade 1, the axial fan also includes:

[0036] Fastener 4, fan blade 1 is assembled onto connecting plate 2 by fastener 4, wherein fastener 4 is in a partially tightened state so that fan blade 1 swings relative to connecting plate 2.

[0037] Locking anti-detachment component 3, the tail of locking anti-detachment component 3 is inserted into the reserved hole of fan blade 1 and fastener 4, and the tail is bent to both sides.

[0038] Specifically, considering that existing speed reducers and other equipment typically use radial fans for heat dissipation, radial fans have disadvantages such as low airflow, poor heat dissipation, and high noise.

[0039] To address this issue, the reducer in this embodiment uses an axial fan instead of a radial fan. An axial fan can significantly increase the gas flow rate and provide greater airflow, thereby significantly improving heat dissipation. At the same time, the structural design of the axial fan results in lower operating noise, making it suitable for noise-sensitive applications.

[0040] However, traditional axial flow fans have a single and fixed oscillation direction, which can only generate airflow in one direction and cannot be adapted to equipment such as speed reducers that need to operate in both forward and reverse directions.

[0041] To address this issue, in this embodiment, the fan blade 1 is mounted on the connecting plate 2 using fasteners 4. The fasteners 4 are set to a partially tightened state, meaning they do not need to be fully tightened, to ensure that the fan blade 1 can swing freely left and right.

[0042] The fan blades in this embodiment are adapted to change the swing direction of the fan blade 1 according to the forward and reverse rotation of the output shaft of the external device (i.e., the external shaft in the following text). During both forward and reverse rotation, the fan blades can generate wind in the direction of the device, thereby realizing the generation of wind in both rotation directions for heat dissipation. This is suitable for the heat dissipation needs of devices that need to operate in both forward and reverse directions.

[0043] Meanwhile, the fan blade 1 and fastener 4 are locked by the locking anti-detachment component 3 to prevent the fan blade 1 and fastener 4 from falling off during the swinging process, thus ensuring the flexibility of the fan blade while improving the reliability and safety of the device.

[0044] In summary, the axial fan of this embodiment, through the cooperation of the partially tightened fastener 4 and the locking and anti-detachment component 3, not only ensures the flexible swing of the fan blade 1, but also prevents the fan blade 1 from falling off, thereby improving the applicability, heat dissipation effect and safety of the axial fan.

[0045] The axial flow fan of this embodiment can be applied to equipment such as speed reducers that require forward and reverse rotation. It should be understood that the axial flow fan of this embodiment can also be applied to equipment that operates in a single direction of rotation or other equipment besides speed reducers that require forward and reverse rotation.

[0046] In a preferred embodiment, the connecting disk 2 is provided with a keyway 5 for mounting an external shaft.

[0047] Specifically, in this embodiment, the connecting plate 2 is provided with a keyway 5, which is mainly used for assembling with the output shaft of the external device to realize the transmission of power. The rotational motion of the output shaft will be transmitted to the connecting plate 2, thereby driving the entire axial fan to rotate. During the rotation, the fan blades 1 generate wind power to carry away the heat generated by the heat source area of ​​the external device, thereby realizing the heat dissipation of the external device.

[0048] The shape of the keyway 5 matches the cross-sectional shape of the external shaft, ensuring that the external shaft can be smoothly inserted into the keyway 5 and that there will be no relative slippage or loosening after assembly. For example, the keyway 5 can be in the shape of a rounded U-shape, which includes a protruding portion that acts as a restraint during assembly, preventing axial or radial displacement of the external shaft within the keyway 5. However, it should be understood that in other embodiments, the shape of the keyway 5 can be adjusted according to specific application requirements. For example, the keyway 5 can be rectangular, trapezoidal, semi-circular, or other polygonal shapes to accommodate different cross-sectional shapes and assembly requirements of external shafts.

[0049] The external shaft is the output shaft of the external device. The external device can be any mechanical equipment that needs to be connected to the axial fan, such as a speed reducer, motor, or other transmission device. As the power output part of the external device, the external shaft is connected to the connecting plate 2 via the keyway 5, thereby achieving power transmission. Taking a speed reducer as an example, the output shaft of the speed reducer is assembled with the connecting plate 2 via the keyway 5, allowing the output torque of the speed reducer to be transmitted to the axial fan, driving its operation.

[0050] In a preferred embodiment, when the rotation direction of the outer shaft changes, the fan blade 1 generates a swing direction relative to the connecting plate 2 under the action of centrifugal force and wind resistance, and the swing direction is related to the change in the rotation direction of the outer shaft.

[0051] Specifically, in this embodiment, when the rotation direction of the external shaft changes, the fan blade 1 is subjected to the combined effects of centrifugal force and wind resistance, resulting in oscillation relative to the connecting disc 2. The centrifugal force is the inertial force generated by the fan blade 1 during rotation, and its direction is always radially outward; while the wind resistance is the reaction force of the airflow acting on the fan blade 1 as it rotates in the air, and its direction is opposite to the direction of motion of the fan blade 1. Under the action of centrifugal force and wind resistance, the oscillation direction of the fan blade 1 changes.

[0052] In a preferred embodiment, the oscillation direction of the fan blade 1 changes in the opposite direction to the rotation direction of the outer shaft.

[0053] Specifically, the oscillation of blade 1 is driven by centrifugal force and wind resistance caused by the change in the rotation direction of the external shaft.

[0054] The rotation direction of the outer shaft includes clockwise rotation and counterclockwise rotation. The oscillation direction of the fan blade 1 includes a first oscillation direction and a second oscillation direction.

[0055] When the external shaft rotates counterclockwise, the fan blade 1 is in the first oscillation direction.

[0056] When the external shaft rotates clockwise, the fan blade 1 will swing in the second direction.

[0057] The first swing direction is opposite to the counterclockwise rotation direction, and the second swing direction is opposite to the clockwise rotation direction.

[0058] When the rotation direction of the external shaft changes, the fan blade 1 will change its swing direction due to centrifugal force and wind resistance. When the external shaft rotates clockwise, the fan blade 1 will swing in a specific direction under the action of centrifugal force and wind resistance, and will always maintain this swing direction, thereby generating airflow towards the side where the external equipment is located, carrying away the heat generated by the external equipment and achieving heat dissipation.

[0059] When the external shaft rotates counterclockwise, the fan blade 1 will swing in the opposite direction to clockwise rotation due to centrifugal force and wind resistance, so that the axial fan can still generate airflow to the side where the external equipment is located for heat dissipation.

[0060] In summary, regardless of whether the external shaft rotates clockwise or counterclockwise, the fan blade 1 can adapt to changes in rotation direction by adjusting its swing direction under the action of centrifugal force and wind resistance, and always maintains the same side to generate airflow for heat dissipation. This can meet the heat dissipation needs of equipment operating in both forward and reverse directions, improve heat dissipation efficiency, and extend the service life of the equipment.

[0061] In a preferred embodiment, the connecting disk 2 is provided with a plurality of mounting holes for fasteners 4 to be assembled, and the plurality of mounting holes are evenly distributed along the circumference of the connecting disk 2.

[0062] Specifically, in this embodiment, the connecting plate 2 is provided with multiple mounting holes, which are arranged through and evenly distributed, so that the fastener 4 is subjected to uniform force during assembly, avoiding structural deformation or damage caused by local stress concentration.

[0063] Furthermore, the fan blade 1 has an internal mounting groove with an internal thread that matches the external thread on the fastener 4, thereby achieving a threaded connection between the fan blade 1 and the connecting disc 2.

[0064] During assembly, the tail of the fastener 4 passes through the mounting hole from the inside of the connecting plate 2 and is screwed into the mounting groove of the fan blade 1, thus connecting the fan blade 1 and the connecting plate 2 through threaded engagement. At the same time, the fastener 4 is not fully tightened, leaving a certain gap or looseness to ensure that the fan blade 1 can swing left and right under the action of centrifugal force and wind resistance generated in the direction of rotation of the external shaft.

[0065] In a preferred embodiment, the device further includes a limiting part 6 for limiting the swing range of the fan blade 1 relative to the connecting plate 2.

[0066] Specifically, in this embodiment, by setting a limiting part 6, the swing range of the fan blade 1 relative to the connecting plate 2 is limited, preventing the fan blade 1 from exceeding the preset range during the swing process, thereby avoiding loosening of the connection, structural damage or performance degradation caused by excessive swing.

[0067] In a preferred embodiment, the limiting part 6 is disposed on the fan blade 1 and mounted on the connecting plate 2.

[0068] Specifically, in this embodiment, the limiting part 6 is preferably disposed on the fan blade 1 and mounted on the connecting plate 2. The limiting part 6 restricts the swing range of the fan blade 1 through its contact and cooperation with the connecting plate 2.

[0069] The limiting part 6 and the connecting plate 2 can be in direct contact or indirectly limited by an intermediate component. The specific design can be adjusted according to the actual application requirements.

[0070] In this embodiment, the fan blade 1 and the limiting part 6 are integrally molded, which simplifies the assembly process, reduces production costs, improves the connection strength between the fan blade 1 and the limiting part 6, and avoids functional failure caused by loosening or falling off the connection.

[0071] In a preferred embodiment, the fan blade 1 includes a mounting surface facing the connecting plate 2, and the mounting surface has a notched corner;

[0072] The limiting part 6 is the part of the assembly surface excluding the missing corner.

[0073] Specifically, in this embodiment, the limiting part 6 is achieved by the notched corner structure at the end of the fan blade 1. The swing range of the fan blade 1 is limited by the cooperation between the notched corner structure of the fan blade 1 mounting surface and the connecting plate 2.

[0074] For ease of description and understanding, the oscillation direction of a single blade 1 is defined based on the position of the limiting part 6 relative to the axis of the blade from the inside out. For example... Figure 3 and Figure 4 As shown, in the first swing direction, the limiting part 6 is located on the right side of the shaft where the fan blade is located. At this time, the limiting part 6 restricts the fan blade 1 from swinging to the right by cooperating with the connecting plate 2; as Figure 5 and Figure 6 As shown, in the second swing direction, the limiting part 6 is located on the left side of the shaft where the fan blade is located. At this time, the limiting part 6 restricts the fan blade 1 from swinging to the left by cooperating with the connecting plate 2.

[0075] In this embodiment, the axial fan is connected to the output shaft of the reducer via a keyway. Based on the rotation direction of the reducer's output shaft, the yaw direction of the fan blade 1 is adjusted under the action of centrifugal force and wind resistance.

[0076] When the output shaft of the reducer rotates counterclockwise, the fan blade 1 will sway to the right due to centrifugal force and wind resistance.

[0077] Similarly, when the output shaft of the reducer rotates clockwise, the fan blade 2 will sway to the left due to centrifugal force and wind resistance.

[0078] The axial fan in this embodiment, with its automatically adjustable blades, can generate a large airflow regardless of whether it rotates clockwise or counterclockwise. It is suitable for situations with high ambient temperatures, high requirements for the thermal power of the reducer, or situations where radial fans cannot meet the heat dissipation needs.

[0079] It should be understood that the location of the limiting part 6 is not limited to being set on the fan blade 1. In other embodiments, it can also be preferably set on the connecting plate 2 according to specific design requirements. When the limiting part 6 is set on the connecting plate 2, it can be arranged on the outer wall of the connecting plate 2, with one limiting part 6 corresponding to each left and right side of each fan blade 1 to achieve left and right limiting; or a limiting part 6 can be set between adjacent fan blades 1 to achieve left and right limiting.

[0080] The schematic diagram of this utility model only shows a rectangular plate-shaped fan blade. In fact, in practical applications, the design of the fan blade 1 can be adjusted according to specific needs. For example, the fan blade 1 can be designed as a curved shape.

[0081] In a preferred embodiment, the locking and anti-loosening component 3 is a cotter pin.

[0082] Specifically, in this embodiment, the locking and anti-loosening component 3 is implemented using a cotter pin, which is used to prevent loosening of the threaded connection. After the fastener 4 is tightened to a certain tightness, the cotter pin is inserted into the reserved hole on the fan blade 1 and the reserved hole at the tail of the fastener 4 to prevent the fan blade 1 from loosening or falling off due to vibration or centrifugal force during the operation of the axial fan.

[0083] In a preferred embodiment, the fastener 4 is a screw.

[0084] Specifically, in this embodiment 2, the fan blade 1 is assembled onto the connecting plate 2 by screws, and the screws are not fully tightened, leaving a certain gap or looseness, so as to ensure that the fan blade 1 can swing freely left and right under the action of centrifugal force and wind resistance; at the same time, the fan blade 1 and the screw are locked by cotter pins, and the cotter pins pass through the hole at the tail of the screw and are fixed to form an anti-detachment structure to prevent the fan blade 1 from loosening or falling off during the swinging process.

[0085] It should be understood that other types of fasteners, such as bolts, may also be used in other embodiments.

[0086] This utility model also provides a speed reducer, which includes an output shaft on which an automatically adjustable axial fan, as described above, is mounted. The output shaft serves as the aforementioned external shaft.

[0087] Specifically, in this embodiment, the reducer uses an axial fan instead of a traditional radial fan. The axial fan can significantly increase the gas flow rate and provide greater airflow, thus resulting in better heat dissipation.

[0088] Existing axial fans can only generate airflow in one direction, making them unsuitable for gearboxes that require reversible rotation. This embodiment uses a gearbox with an automatically directional axial fan. Because the blades of this automatically directional axial fan can swing left and right, it can generate significant airflow for gearboxes requiring reversible rotation, achieving better heat dissipation. This makes it suitable for gearboxes with high thermal efficiency requirements, especially when the input shaft temperature of the gearbox is relatively high.

[0089] The advantages or beneficial effects of adopting the above technical solution are as follows: This utility model uses non-fully tightened fasteners to assemble the fan blade and the connecting plate, allowing the fan blade to swing flexibly relative to the connecting plate, adapting to changes in the forward and reverse rotation of the shaft, thereby generating wind power in both directions, which is suitable for equipment that needs to operate in both forward and reverse directions; at the same time, the tail of the locking and anti-detachment component is inserted into the reserved holes of the fan blade and the fastener and bent to both sides, which can prevent the fan blade and the fastener from falling off during the swinging process, improving the reliability and safety of the device while ensuring the flexibility of the fan blade.

[0090] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. An axial flow fan with automatic direction adjustment, comprising a connecting plate and fan blades, characterized in that, Also includes: Fasteners are used to attach the fan blades to the connecting plate, wherein the fasteners are in a partially tightened state to allow the fan blades to oscillate relative to the connecting plate. A locking and anti-detachment component is provided, wherein the tail end of the locking and anti-detachment component is inserted into the reserved holes of the fan blade and the fastener, and the tail end is bent to both sides.

2. The automatically directional axial fan according to claim 1, characterized in that, The connecting plate is provided with a keyway for external shaft assembly; When the rotation direction of the external shaft changes, the fan blades generate a swing direction relative to the connecting plate under the action of centrifugal force and wind resistance, and the swing direction is related to the change in the rotation direction of the external shaft.

3. The automatically directional axial fan according to claim 2, characterized in that, The oscillation direction of the fan blades changes in the opposite direction to the rotation direction of the external shaft.

4. The automatically directional axial fan according to claim 1, characterized in that, The connecting plate is provided with a plurality of mounting holes for assembling the fasteners, and the plurality of mounting holes are evenly distributed along the circumference of the connecting plate.

5. The automatically directional axial fan according to claim 1, characterized in that, Also includes: A limiting part for limiting the swing range of the fan blades relative to the connecting disc.

6. The automatically directional axial fan according to claim 5, characterized in that, The limiting part is disposed on the fan blade and is mounted on the connecting plate.

7. The automatically directional axial fan according to claim 6, characterized in that, The fan blade includes a mounting surface facing the side of the connecting plate, and the mounting surface has a notched corner; The limiting part is the portion of the assembly surface excluding the missing corner.

8. The automatically directional axial fan according to claim 1, characterized in that, The locking and anti-loosening component is a cotter pin.

9. The automatically directional axial fan according to claim 1, characterized in that, The fastener is a screw.

10. A speed reducer, characterized in that, The speed reducer includes an output shaft on which an automatically directional axial fan as described in any one of claims 1-9 is mounted.

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