fan

Abstract

The application provides a fan. The fan comprises a shell, a plurality of fan blades and a driving disc. The shell is internally provided with a cavity. The plurality of fan blades are circumferentially and spacedly arranged on the outer periphery of the shell and the end portions of the fan blades extend into the cavity. The driving disc is accommodated in the cavity. The driving disc is provided with a plurality of racks. The end portion of each fan blade is provided with a gear wheel. The gear wheel is engaged with a corresponding rack. The driving disc can drive the racks to move along the axial direction of the fan, so as to drive the gear wheels and the fan blades to rotate around an axis. The application realizes the adjustability and synchronism of the angles of the plurality of fan blades by driving the racks to move and the gear wheels to rotate through the axial movement of the driving disc, and flexibly meets the heat dissipation requirement. Meanwhile, the gear wheel and rack mechanism has a simple engagement structure and does not need complex electronic components, thereby reducing the manufacturing and maintenance costs.

Description

Technical Field

[0001] This application relates to the field of fans, and more particularly to a fan. Background Technology

[0002] In industrial cooling and air conditioning units, fans are core heat dissipation components, and their performance directly affects the operating efficiency and stability of the equipment. As equipment becomes smaller and more integrated, strict limitations are placed on fan installation space. In many applications, the radial dimension that can accommodate a fan inside the equipment is fixed, making it impossible to increase airflow adjustment capabilities by increasing the fan diameter. Furthermore, traditional fans often have a fixed, integrated blade and hub structure, meaning the blade angle cannot be changed after manufacturing. Airflow can only be adjusted by changing the motor speed, a limited adjustment method that fails to simultaneously meet the demands of low noise and efficient heat dissipation.

[0003] Existing technologies also employ complex linkage mechanisms or independent electric actuators to control each fan blade. However, these drive structures are complex, space-consuming, and costly to manufacture, and it is difficult to guarantee the synchronization and precision of the adjustment of all fan blades. Poor synchronization among multiple blades can easily lead to angular deviations, resulting in airflow turbulence and reduced efficiency. Furthermore, the drive mechanism is located at the root of the fan blades or in the rotation area, occupying radial space and conflicting with compact design requirements.

[0004] Therefore, it is necessary to provide an improved fan to solve the above problems. Utility Model Content

[0005] This application provides a low-cost and highly adaptable fan.

[0006] This application provides a fan, including: a housing, a plurality of fan blades, and a drive disk. The housing has a cavity, the plurality of fan blades are circumferentially spaced around the outer periphery of the housing and their ends extend into the cavity, and the drive disk is housed in the cavity. The drive disk has a plurality of racks, and each fan blade has a gear at its end, the gear meshing with a corresponding rack. The drive disk can drive the racks to move along the axial direction of the fan, thereby driving the gears and the fan blades to rotate around an axis.

[0007] Furthermore, it also includes a drive mechanism, which is connected to the drive disk for driving the drive disk to move along its axial direction.

[0008] Furthermore, the drive mechanism includes a motor and a motor shaft connected to the output end of the motor. A threaded sleeve is provided in the middle of the drive disk. The motor shaft protrudes axially into the threaded sleeve. The outer peripheral wall of the motor shaft and the inner peripheral wall of the threaded sleeve are engaged by threads. The motor drives the motor shaft to rotate, thereby driving the drive disk to reciprocate axially.

[0009] Furthermore, the drive disk also includes a limiting part located in its middle, and the threaded sleeve is connected to the limiting part; the outer peripheral wall of the threaded sleeve is provided with an outwardly protruding protrusion, and the limiting part is provided with an anti-rotation groove corresponding to the protrusion, and the protrusion is engaged in the anti-rotation groove.

[0010] Furthermore, the fan blade includes a blade, a driving part disposed at one end of the blade, and a fixing part connecting the blade and the driving part; the blade is located outside the housing; the driving part is housed in the cavity, and the gear is located on the driving part; the fixing part is rotatably connected to the housing.

[0011] Furthermore, the side of the housing is provided with a plurality of fixing holes, which are spaced apart along the circumference of the housing. The driving part extends into the cavity through the fixing holes. The fixing holes are also provided with limiting grooves along their circumference. The fixing part is provided with an outwardly protruding limiting block, which is received in the limiting groove.

[0012] Furthermore, the fixing part has a first boss on the side near the blade, and the diameter of the first boss is larger than the diameter of the fixing hole; when the fixing part is connected to the housing, the first boss abuts against the outer side of the housing.

[0013] Furthermore, the fixing part is provided with an annular groove on the side near the driving part, and the annular groove is located in the cavity; the fan also includes a retaining spring, which is engaged in the annular groove, and the two sides of the retaining spring abut against the inner side of the housing and the fixing part, respectively.

[0014] Furthermore, the inner wall of the housing is provided with an inwardly extending support column in the middle, and the drive disk is provided with an outwardly protruding convex column in the middle. The support column and the convex column are coaxially arranged in the cavity. The fan also includes an elastic element, which is disposed between the housing and the drive disk and sleeved on the outside of the support column and the convex column.

[0015] Furthermore, the housing includes a front shell and a rear shell assembled together, the front shell and the rear shell forming the cavity, the front shell being provided with the support column, and the front shell being connected to the plurality of fan blades.

[0016] This application achieves adjustable and synchronized fan blade angles by driving the axial movement of the drive disc to move the rack and rotate the gears, thus flexibly meeting heat dissipation requirements. At the same time, the rack and pinion mechanism has a simple meshing structure, eliminating the need for complex electronic components and reducing manufacturing and maintenance costs. Attached Figure Description

[0017] Figure 1This is a perspective view of a fan according to an exemplary embodiment of this application.

[0018] Figure 2 yes Figure 1 The exploded view of the fan is shown.

[0019] Figure 3 yes Figure 1 The image shows a cross-sectional view of the fan.

[0020] Figure 4 yes Figure 1 A cross-sectional view of the fan from another perspective.

[0021] Figure 5 yes Figure 2 The image shows a perspective view of the front casing of the fan.

[0022] Figure 6 yes Figure 2 The image shows a 3D view of the fan blades.

[0023] Figure 7 This is a partial perspective view of the fan front casing and fan blades after assembly.

[0024] Figure 8 This is a partial sectional view of the front housing, fan blades, and drive plate of the fan in this application after assembly.

[0025] Figure 9 This is a perspective view of the assembled front housing, fan blades, and drive plate of the fan in this application.

[0026] Figure 10 yes Figure 9 The image shows a partial enlarged view of the fan blades assembled with the front housing.

[0027] Explanation of icon numbers: 10. Housing; 101. Front housing; 102. Rear housing; 11. Cavity; 12. Fixing hole; 121. Limiting groove; 122. Boss; 13. Support column; 20. Fan blade; 21. Gear; 22. Blade; 23. Drive unit; 24. Fixing unit; 241. Limiting block; 242. First boss; 243. Annular groove; 30. Drive disk; 301. Drive disk body; 302. Extension arm; 31. Rack; 32. Threaded sleeve; 321. Protrusion; 33. Limiting part; 331. Anti-rotation groove; 34. Protruding column; 40. Drive mechanism; 41. Motor; 42. Motor shaft; 50. Snap ring; 60. Elastic element. Detailed Implementation

[0028] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0030] See Figures 1 to 3 As shown, this application provides a fan, including a housing 10, a plurality of fan blades 20, a drive disk 30, and a drive mechanism 40. The plurality of fan blades 20 are circumferentially spaced around the outer periphery of the housing 10. The drive disk 30 and the drive mechanism 40 are both disposed within the housing 10. The drive disk 30 moves along the axial direction of the fan to drive the fan blades 20 to rotate around its axis. The drive mechanism 40 is drively connected to the drive disk 30 and is used to drive the drive disk 30 to move along its axial direction.

[0031] The housing 10 has a cavity 11 inside. The housing 10 includes a front shell 101 and a rear shell 102. The front shell 101 and the rear shell 102 are assembled together to form the cavity 11. The ends of several fan blades 20 extend into the cavity 11. The drive disk 30 and the drive mechanism 40 are both housed in the cavity 11. Several fixing holes 12 are provided on the side of the housing 10. The fixing holes 12 are spaced apart along the circumference of the housing 10, and the cavity 11 communicates with the external space through the fixing holes 12. The ends of the fan blades 20 extend into the cavity 11 through the fixing holes 12.

[0032] See Figure 5 As shown, according to the embodiment of this application, the fixing hole 12 is a circular opening formed on the front shell 101. The fixing hole 12 also has a limiting groove 121 along its circumference for engaging and fixing with the end of the fan blade 20. A boss 122 is also provided on the front shell 101 at the outer edge of the fixing hole 12. The boss 122 is rectangular, and the fixing hole 12 is located in the middle of the boss 122. A support column 13 extending inward is provided in the middle of the inner wall of the shell 10. Specifically, the support column 13 extends from the center of the inner wall of the front shell 101 towards the rear shell 102.

[0033] In the embodiments of this application, there are six fixing holes 12, with one fixing hole 12 corresponding to each fan blade 20.

[0034] See Figure 4 , Figure 6 and Figure 7As shown, the fan blade 20 includes a blade 22, a driving part 23, and a fixing part 24. The two ends of the fixing part 24 are connected to the blade 22 and the driving part 23, respectively. The blade 22 is located outside the housing 10. The driving part 23 extends into the cavity 11 through the fixing hole 12 and is housed within the cavity 11. A gear 21 is provided on the driving part 23. In the embodiments of this application, both the driving part 23 and the fixing part 24 are cylindrical. The gear 21 rotates along the axis of the fan blade 20. The fixing part 24 is provided with an outwardly protruding limiting block 241. The fixing part 24 is rotatably connected to the housing 10, and the limiting block 241 is housed within a limiting groove 121. When the fan blade 20 rotates to a certain angle, the limiting block 241 abuts against the end of the limiting groove 121 to limit the rotation angle of the fan blade 20.

[0035] The fixing part 24 has a first boss 242 on the side near the blade 22. The diameter of the first boss 242 is larger than the diameter of the fixing hole 12. When the fixing part 24 is connected to the housing 10, the first boss 242 abuts against the outer side of the housing 10. The first boss 242 acts as a mechanical stop to prevent the fan blade 20 from displacing along the fixing hole 12 towards the inner side of the housing 10 under the reaction force of airflow or vibration.

[0036] The fixing part 24 has an annular groove 243 on the side near the drive part 23, and the annular groove 243 is located inside the cavity 11. The fan also includes a retaining spring 50, which is engaged in the annular groove 243, and both sides of the retaining spring 50 simultaneously abut against the inner side of the housing 10 and the fixing part 24. The outer diameter of the retaining spring 50 is larger than the diameter of the fixing hole 12. The cooperation between the retaining spring 50 and the annular groove 243 forms a clamping effect, preventing the fan blade 20 from displacing from the fixing hole 12 to the outside of the housing 10. The retaining spring 50 and the first boss 242 together form a double limit, limiting the axial displacement of the fan blade 20, solving the risk of fan blade slippage under high-speed rotation, and enhancing safety.

[0037] According to other embodiments of this application, the first boss 242 can also be replaced by multiple small protrusions distributed circumferentially, instead of a single cylindrical boss. The retaining ring 50 can also be replaced by an elastic retaining ring or a spiral retaining ring, etc. In addition, the retaining ring 50 can be omitted and replaced with a magnetic adsorption or hydraulic locking mechanism, or the fixing part 24 can be directly connected to the housing 10 through a bearing, etc.

[0038] According to the embodiments of this application, the number of fan blades 20 and retaining rings 50 is six. This application does not limit the number of fan blades 20 and retaining rings 50.

[0039] See Figures 8 to 10As shown, the drive disk 30 includes a drive disk body 301 and a plurality of extension arms 302 extending radially from the drive disk body 301. Each extension arm 302 is provided with a rack 31. In the embodiments of this application, the number of extension arms 302 and racks 31 is six. Each blade 20 has a gear 21 at its end, and the gear 21 meshes with a corresponding rack 31. The drive disk 30 can drive the rack 31 to move along the axial direction of the fan, so as to drive the gear 21 and the blade 20 to rotate about an axis.

[0040] The radial layout of the extension arm 302 ensures that all racks 31 move synchronously as the drive disc 30 moves axially, making the angle changes of the six fan blades 20 consistent, thereby achieving synchronous adjustment of the rotation angle of each fan blade 20. The fan with adjustable blade angles 22 can further expand the airflow adjustment range based on motor speed adjustment, thus expanding the operating range of the air conditioning unit. Units of different tonnages in the same series require fans with the same diameter but different blade angles; however, using the fan of this application can achieve standardized fan specifications and reduce material usage.

[0041] According to other embodiments of this application, the number of racks 31 can be changed to four, eight or more, to match the increase or decrease in the number of fan blades 20.

[0042] The drive disc 30 has a threaded sleeve 32 and a limiting part 33 in its middle. The threaded sleeve 32 is connected to the limiting part 33. The outer peripheral wall of the threaded sleeve 32 has an outwardly protruding protrusion 321. The limiting part 33 has an anti-rotation groove 331 corresponding to the protrusion 321, and the protrusion 321 is engaged in the anti-rotation groove 331. The engagement between the protrusion 321 and the anti-rotation groove 331 forms a mechanical lock, restricting unnecessary radial rotation of the drive disc 30 during axial movement. This optimizes the coaxiality of the drive disc 30 during axial push-pull movements, ensures that the meshing of the gear 21 and the rack 31 is always tight, reduces the impact of backlash, and improves the angle adjustment accuracy of the fan blade 20.

[0043] In the embodiments of this application, the threaded sleeve 32 is connected to the drive disk body 301, and the limiting part 33 is fixed to the rear shell 102. There are three protrusions 321 and three anti-rotation grooves 331. A protruding post 34 is provided in the middle of the drive disk 30. The protruding post 34 and the threaded sleeve 32 are respectively disposed on the inner and outer sides of the drive disk body 301, with the protruding post 34 extending towards the front shell 101 and the threaded sleeve 32 extending towards the rear shell 102.

[0044] The support column 13 and the protrusion 34 are coaxially arranged within the cavity 11. The fan also includes an elastic element 60, which is located between the housing 10 and the drive disk 30 and sleeved outside the support column 13 and the protrusion 34. The coaxial arrangement of the support column 13 and the protrusion 34 ensures the straightness of the axial movement trajectory of the drive disk 30 and avoids skewness. At the same time, the elastic element 60 provides continuous preload to compensate for the meshing clearance between the gear 21 and the rack 31. Furthermore, the elastic element 60 acts as a buffer element, reducing operating noise and component wear, making it suitable for vibration environments.

[0045] The drive mechanism 40 includes a motor 41 and a motor shaft 42 connected to the output end of the motor 41. The motor shaft 42 protrudes axially into the threaded sleeve 32, and the outer peripheral wall of the motor shaft 42 engages with the inner peripheral wall of the threaded sleeve 32 via threads. The motor 41 drives the motor shaft 42 to rotate, thereby driving the drive disk 30 to reciprocate axially. The threaded engagement structure converts the rotational motion of the motor shaft 42 into the linear motion of the drive disk 30, resulting in a high transmission ratio and precise displacement control. The motor 41 drive enables rapid forward and reverse rotation, has a short response time, and supports real-time adjustment of the fan blade 20 angle.

[0046] According to the embodiments of this application, if the drive mechanism 40 is an electrical component, the electrical signal input can be in the form of slip rings, collector rings, or other commonly used in rotating parts. Alternatively, an electromagnetic proportional valve or hydraulic power can be used to provide the driving force.

[0047] This application achieves adjustable and synchronized angles of several fan blades 20 by driving the axial movement of the drive disk 30 to move the rack 31 and rotate the gear 21, thus flexibly meeting heat dissipation requirements. At the same time, the gear and rack mechanism has a simple meshing structure, requiring no complex electronic components, thereby reducing manufacturing and maintenance costs.

[0048] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A fan, characterized in that, include: The fan comprises a housing, several fan blades, and a drive disk. The housing has a cavity, and the fan blades are circumferentially spaced around the outer periphery of the housing with their ends extending into the cavity. The drive disk is housed within the cavity. The drive disk has several racks, and each fan blade has a gear at its end. The gear meshes with a corresponding rack. The drive disk can drive the racks to move along the axial direction of the fan, thereby driving the gears and fan blades to rotate around an axis.

2. The fan according to claim 1, characterized in that, It also includes a drive mechanism, which is connected to the drive disk and is used to drive the drive disk to move along its axial direction.

3. The fan according to claim 2, characterized in that, The drive mechanism includes a motor and a motor shaft connected to the output end of the motor. A threaded sleeve is provided in the middle of the drive disk. The motor shaft protrudes axially into the threaded sleeve. The outer peripheral wall of the motor shaft and the inner peripheral wall of the threaded sleeve are engaged by threads. The motor drives the motor shaft to rotate, thereby driving the drive disk to reciprocate axially.

4. The fan according to claim 3, characterized in that, The drive disk also includes a limiting part located in its middle, and the threaded sleeve is connected to the limiting part; the outer peripheral wall of the threaded sleeve is provided with an outwardly protruding protrusion, and the limiting part is provided with an anti-rotation groove corresponding to the protrusion, and the protrusion is engaged in the anti-rotation groove.

5. The fan according to claim 1, characterized in that, The fan blade includes a blade, a drive unit located at one end of the blade, and a fixing unit connecting the blade and the drive unit; the blade is located outside the housing; the drive unit is housed within the cavity, and the gear is located on the drive unit; the fixing unit is rotatably connected to the housing.

6. The fan according to claim 5, characterized in that, The side of the housing is provided with a plurality of fixing holes, which are spaced apart along the circumference of the housing. The driving part extends into the cavity through the fixing holes. The fixing holes are also provided with limiting grooves along their circumference. The fixing part is provided with an outwardly protruding limiting block, which is received in the limiting groove.

7. The fan according to claim 6, characterized in that, The fixing part has a first protrusion on the side near the blade, and the diameter of the first protrusion is larger than the diameter of the fixing hole; when the fixing part is connected to the housing, the first protrusion abuts against the outer side of the housing.

8. The fan according to claim 6, characterized in that, The fixing part is provided with an annular groove on the side near the driving part, and the annular groove is located in the cavity; the fan also includes a retaining spring, which is engaged in the annular groove, and the two sides of the retaining spring abut against the inner side of the housing and the fixing part, respectively.

9. The fan according to claim 1, characterized in that, The inner wall of the housing has an inwardly extending support column in the middle, and the drive disk has an outwardly protruding convex column in the middle. The support column and the convex column are coaxially arranged in the cavity. The fan also includes an elastic element, which is located between the housing and the drive disk and sleeved on the outside of the support column and the convex column.

10. The fan according to claim 9, characterized in that, The housing includes a front shell and a rear shell assembled together, the front shell and the rear shell together forming the cavity, the front shell is provided with the support column, and the front shell is connected to the plurality of fan blades.

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