Dustproof structure and fan comprising same

Abstract

The dustproof structure is formed by matching a bottom plate of a fan frame assembly and a base of a fan blade assembly, a middle pipe, an inner check ring and an outer check ring are integrally arranged on the end face, facing the base, of the bottom plate, and a fixing part, a sleeve, an inner sleeve and an outer sleeve are integrally arranged on the end face, facing the bottom plate, of the base. A rotating shaft of the fan penetrates through the fixing part, the inner check ring and the outer check ring of the bottom plate and the inner sleeve and the outer sleeve of the base are arranged in an up-down staggered and inserted mode, so that a two-layer protection structure is formed, and the middle pipe, the fixing part and the sleeve are arranged in an up-down staggered and inserted mode, so that a third-layer protection structure is formed. According to the fan, dust can be prevented from entering the middle pipe from outside to inside through the three layers of protection structures, flying dust can be effectively isolated under the condition that no part is added, the assembly difficulty is not increased for the whole machine, the dustproof effect of the whole machine is remarkably improved, and the service life of the fan is also prolonged.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a dustproof structure and a fan containing the same. Background Technology

[0002] In existing designs, when the fan is stationary, dust particles enter the fan frame assembly with the airflow. When the fan is running, the dust particles inside the fan frame assembly are then carried by the airflow from the rotating fan blade assembly into the central tube of the fan frame assembly and thus into the bearing. Currently, due to cost considerations, most fan bearings used are oil-impregnated bearings. Oil-impregnated bearings require lubricating grease, and dust particles adsorbing onto the lubricating grease affect the fan's lifespan and increase noise.

[0003] Currently, the design methods for dust prevention in the fan bearing section include adding sealing parts inside the central tube of the fan frame assembly (see patent CN218509773U) and adding a dust cover to the outside of the central tube of the fan frame assembly. These solutions all require additional parts, which increases the cost of the product. Furthermore, since the internal installation space of the fan is limited, adding parts will increase the assembly difficulty and may even require increasing the size of the fan.

[0004] Therefore, it is necessary to design a dustproof structure for the fan that does not require additional parts and is easy to install. Utility Model Content

[0005] To address the technical problem that dustproof design of existing fans requires additional parts, leading to increased fan costs and assembly difficulties, this utility model provides a dustproof structure and a fan containing the structure to solve the above problems.

[0006] This utility model proposes a dustproof structure, which is formed by the cooperation of the base plate of the fan frame assembly and the base of the fan blade assembly. The end face of the base plate facing the base is integrally provided with a middle tube, an inner retaining ring and an outer retaining ring. The end face of the base facing the base plate is integrally provided with a fixing part, a sleeve, an inner sleeve and an outer sleeve. The fixing part is for the fan shaft to pass through. The inner retaining ring and the outer retaining ring of the base plate are staggered with the inner sleeve and the outer sleeve of the base to form a two-layer protective structure. The middle tube is staggered with the fixing part and the sleeve to form a third layer of protective structure.

[0007] Furthermore, the end of the outer sleeve furthest from the base is inserted into the first groove formed by the inner and outer retaining rings, forming the first protective structure.

[0008] Furthermore, the end of the inner retaining ring furthest from the base plate is inserted into the second groove formed by the inner sleeve and the outer sleeve, forming a second protective structure.

[0009] Furthermore, the end of the central tube furthest from the base plate is inserted into the third groove formed by the fixing part and the sleeve.

[0010] Furthermore, the second groove is provided with a plurality of radially extending reinforcing ribs.

[0011] Furthermore, the depth to which the inner retaining ring extends into the second groove is less than the height of the reinforcing rib to the edge of the second groove facing the bottom plate.

[0012] Furthermore, the ends of the inner and outer retaining rings furthest from the base plate are bent toward the axis.

[0013] Furthermore, the inner and outer retaining rings are provided with cable outlet grooves, and the cable outlet grooves are provided with notches to hold the power cable in place.

[0014] Furthermore, the fan frame assembly also includes a square outer frame and several strip brackets connecting the square outer frame and the base plate, one of which is provided with a snap-fit ​​part located radially outside the wire outlet groove on the outer retaining ring.

[0015] This utility model also proposes a fan, including the dustproof structure described above.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model can prevent dust from entering the middle tube from the outside to the inside through a three-layer protective structure. Each layer of protective structure is integrally set on the base plate and the base. Without adding any parts, it can effectively isolate flying dust. For the whole machine, the assembly difficulty is not increased. On the contrary, the dust prevention effect of the whole machine is significantly improved, and the service life of the fan is also extended.

[0018] (2) The reinforcing ribs in the fan blade assembly of this utility model allow the airflow to blow the dust outside the outer ring of the fan frame assembly when the fan blade assembly rotates. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a perspective view of the fan frame assembly in the dustproof structure described in this utility model;

[0021] Figure 2 This is a perspective view of the fan blade assembly in the dustproof structure described in this utility model;

[0022] Figure 3 This is an axial sectional view of the fan described in this utility model;

[0023] Figure 4 This is an exploded view of the fan described in this utility model.

[0024] In the diagram, 1. Fan frame assembly, 101. Square outer frame, 102. Base plate, 103. Strip bracket, 2. Fan blade assembly, 201. Base, 202. Blade, 3. Cable outlet groove, 4. Reinforcing rib, 5. Middle tube, 6. Inner retaining ring, 7. Outer retaining ring, 8. Fixing part, 9. Sleeve, 10. Inner sleeve, 11. Outer sleeve, 12. Shaft, 13. First groove, 14. Second groove, 15. Third groove, 16. Snap-fit ​​part, 17. Magnetic ring assembly, 18. Stator assembly, 19. Bearing, 20. Card, 21. Magnet. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] Example 1

[0027] like Figures 1-3 As shown, a dustproof structure is formed by the cooperation of a base plate 102 of a fan frame assembly 1 and a base 201 of a fan blade assembly 2. The fan frame assembly 1 typically also includes a square outer frame 101, a base plate 102, and several strip-shaped supports 103 connecting the square outer frame 101 and the base plate 102. The fan blade assembly 2 typically includes a base 201 and several blades 202 located on the outer periphery of the base 201. A central tube 5, an inner retaining ring 6, and a... are integrally formed on the end face of the base plate 102 facing the base 201. The outer retaining ring 7, the middle tube 5, the inner retaining ring 6, and the outer retaining ring 7 all protrude towards the base 201, and the distance from the axis gradually increases. The outer retaining ring 7 is located at the outer edge of the base plate 102. The end face of the base 201 facing the base plate 102 is integrally provided with a fixing part 8, a sleeve 9, an inner sleeve 10, and an outer sleeve 11. The fixing part 8, the sleeve 9, the inner sleeve 10, and the outer sleeve 11 all protrude towards the base plate 102, and the distance from the axis gradually increases. The outer sleeve 11 is located at the outer edge of the base 201. The inner retaining ring 6 and the outer retaining ring 7 form a first groove 13, and the inner sleeve 10 and the outer sleeve 11 form a second groove 14.

[0028] The fixed part 8 allows the fan shaft 12 to pass through, such as... Figure 2 and Figure 3 As shown, a trapezoidal boss-shaped fixing part 8 is provided at the axis of the base plate 102 to fix the rotating shaft 12, and is interference-fitted with the rotating shaft 12. The fixing part 8 and the outer sleeve 9 form a third groove 15. The distance between the sleeve 9 and the inner sleeve 10 is relatively large.

[0029] The inner retaining ring 6 and outer retaining ring 7 of the base plate 102 are staggered with the inner sleeve 10 and outer sleeve 11 of the base 201, thus forming a two-layer protective structure. The middle tube 5 is staggered with the fixing part 8 and the sleeve 9, thus forming a third layer of protective structure. Assuming that the fan frame assembly 1 is located below and the fan blade assembly 2 is located above, the inner retaining ring 6 and outer retaining ring 7 extend from bottom to top, and the inner sleeve 10 and outer sleeve 11 extend from top to bottom. The four are staggered to achieve vertical insertion. The arrangement of the middle tube 5 with the fixing part 8 and the sleeve 9 is similar.

[0030] For the first and second protective structures counted from the outside in, either the outer baffle 7 or the outer sleeve 11 can be placed on the outermost layer. Since the size of the fan frame assembly 1 is relatively large and the size of the fan blade assembly 2 is slightly smaller, it is preferable to place the outer baffle 7 on the outermost layer. In this case, the outer diameter of the base plate 102 will be larger than the outer diameter of the base 201. Therefore, in this embodiment, the first and second protective structures are specifically formed as follows: the end of the outer sleeve 11 away from the base 201 is inserted into the first groove 13 formed by the inner baffle 6 and the outer baffle 7 to form the first protective structure; the end of the inner baffle 6 away from the base plate 102 is inserted into the second groove 14 formed by the inner sleeve 10 and the outer sleeve 11 to form the second protective structure.

[0031] Regarding the formation of the third protective structure, under normal circumstances, the central tube 5, the fixing part 8, and the sleeve 9 are all tubular structures. In this case, the central tube 5 is formed by inserting the end of the central tube 5 away from the base plate 102 into the third groove 15 formed by the fixing part 8 and the sleeve 9. In other unconventional cases, for example, the end of the central tube 5 away from the base plate 102 may have two annular grippers extending out, which can be interlocked with the fixing part 8 and the sleeve 9.

[0032] Both the inner baffle ring 6 and the outer baffle ring 7 serve to isolate flying dust. Even if flying dust enters the first groove 13, the rotating fan blade assembly 2 can expel some of the dust from the first groove 13 by the airflow generated by its rotation. The third protective layer effectively isolates flying dust, preventing it from entering the interior of the central tube 5. This provides multi-layered protection from the outside in. By designing multiple interlaced rings to form a labyrinth structure, flying dust is effectively prevented from entering the oil-impregnated bearing 19, improving the lifespan of the fan and reducing noise. Compared with traditional dust prevention methods, this invention effectively isolates flying dust without adding any parts. For the whole machine, the assembly difficulty is not increased; on the contrary, it significantly improves the overall dust prevention effect and extends the service life of the fan.

[0033] Example 2

[0034] Based on Example 1, such as Figure 2As shown, a plurality of radially extending reinforcing ribs 4 are provided in the second groove 14. The reinforcing ribs 4 can be provided only on the inner sleeve 10 or the outer sleeve 11, or their two ends can be connected to the inner sleeve 10 and the outer sleeve 11 respectively. The reinforcing ribs 4 are preferably arranged in an array along the circumference of the second groove 14.

[0035] Since the inner retaining ring 6 needs to be inserted into the second groove 14, in order to avoid interference between the reinforcing rib 4 and the inner sleeve 10, it is preferable that the depth of the inner retaining ring 6 extending into the second groove 14 is less than the height of the reinforcing rib 4 to the edge of the second groove 14 facing the bottom plate 102.

[0036] During the rotation of the fan blade assembly 2, airflow is generated at the reinforcing rib 4. When the fan blade assembly 2 rotates, the reinforcing rib 4 also rotates together, thus generating airflow. This blows the dust onto the outer wall of the outer baffle ring 7, preventing the dust from entering the fan and affecting its performance.

[0037] The first, second, and third protective structures, along with the reinforcing ribs 4 inside the fan blade assembly 2, provide a quadruple dust protection for the inside of the fan. Even if dust enters the first protective structure from the outer baffle ring 7 of the fan frame, the rotation of the reinforcing ribs 4 can blow the dust out of the outer baffle ring 7 before it enters the second protective structure. The third protective structure provides the final protection, preventing any remaining dust from re-entering the fan.

[0038] Example 3

[0039] Based on the above embodiments, such as Figure 3 As shown, the ends of the inner retaining ring 6 and the outer retaining ring 7 away from the base plate 102 are bent towards the axis. The bending angle is preferably 45°. This bending design can play a guiding role, so that the dust entering the first groove 13 can be discharged according to the guide during the rotation of the fan, and can also make the opening of the first groove 13 tilt inward, thereby effectively preventing external dust from directly entering the first groove 13.

[0040] Example 4

[0041] Based on the above embodiments, to avoid bending the power cord, such as Figure 1 As shown, in this embodiment, the inner retaining ring 6 and the outer retaining ring 7 are provided with cable outlet grooves 3. The cable outlet grooves 3 are provided with notches to hold the power cord. For a three-phase motor driven fan, there are three notches, each notch holding one power cord. The cable outlet grooves 3 on the inner retaining ring 6 and the outer retaining ring 7 are preferably arranged opposite each other, that is, the two cable outlet grooves 3 are arranged in the same radial direction. At this time, the two are closest to each other, and the power cord can pass through the cable outlet grooves 3 of the inner retaining ring 6 and the outer retaining ring 7 in the same direction.

[0042] In a further design, to prevent the power cord from moving up and down within the fan frame assembly 1, this embodiment provides a locking part 16 on one of the strip brackets 103. The locking part 16 is located radially outside the cable outlet groove 3 on the outer retaining ring 7. Figure 1 As shown, the snap-fit ​​part 16 extends along the circumferential direction and is approximately perpendicular to the strip bracket 103. The function of the snap-fit ​​part 16 is to block the power cord from below, preventing the power cord from moving upward and interfering with the blade 202.

[0043] Example 5

[0044] A fan, comprising the dustproof structure described above. For example... Figure 4 As shown, the fan also includes a magnetic ring assembly 17, a stator assembly 18, a bearing 19, a clip 20, and a magnet 21. The magnet 21, clip 20, and bearing 19 are sequentially mounted on the inner bottom surface of the central tube 5. The stator assembly 18 is located within the cavity formed by the outer bottom plate 102 of the central tube 5 and the base 201. The magnetic ring assembly 17 is located inside the central tube 5. The magnetic ring assembly 17 provides rotational power to the fan blades, and the stator assembly 18 provides a rotating magnetic field to the magnetic ring assembly 17. The bearing 19 is used to fix the rotor, reduce wear, and lower noise. The clip 20 is used to prevent the fan blade assembly 2 from falling off. The magnet 21 is used to reduce the axial movement of the fan blade assembly 2.

[0045] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a number" means two or more.

[0047] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0048] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dustproof structure, characterized in that: The dustproof structure is formed by the base plate (102) of the fan frame assembly (1) and the base (201) of the fan blade assembly (2). The end face of the base plate (102) facing the base (201) is integrally provided with a middle tube (5), an inner retaining ring (6) and an outer retaining ring (7). The end face of the base (201) facing the base plate (102) is integrally provided with a fixing part (8), a sleeve (9), an inner sleeve (10) and an outer sleeve (11). The fixing part (8) is for the fan shaft (12) to pass through. The inner retaining ring (6) and the outer retaining ring (7) of the base plate (102) are staggered with the inner sleeve (10) and the outer sleeve (11) of the base (201) to form a two-layer protective structure. The middle tube (5) is staggered with the fixing part (8) and the sleeve (9) to form a third layer protective structure.

2. The dustproof structure according to claim 1, characterized in that: The outer sleeve (11) is inserted into the first groove (13) formed by the inner retaining ring (6) and the outer retaining ring (7) at one end away from the base (201), forming the first protective structure.

3. The dustproof structure according to claim 2, characterized in that: The inner retaining ring (6) is inserted into the second groove (14) formed by the inner sleeve (10) and the outer sleeve (11) at one end away from the bottom plate (102), forming a second protective structure.

4. The dustproof structure according to claim 1, characterized in that: The end of the central tube (5) away from the bottom plate (102) is inserted into the third groove (15) formed by the fixing part (8) and the sleeve (9).

5. The dustproof structure according to claim 3, characterized in that: The second groove (14) is provided with a number of radially extending reinforcing ribs (4).

6. The dustproof structure according to claim 5, characterized in that: The inner retaining ring (6) extends into the second groove (14) to a depth less than the height of the reinforcing rib (4) to the edge of the second groove (14) facing the bottom plate (102).

7. The dustproof structure according to claim 1, characterized in that: The inner retaining ring (6) and the outer retaining ring (7) are bent toward the axis at the ends away from the base plate (102).

8. The dustproof structure according to claim 1, characterized in that: The inner retaining ring (6) and the outer retaining ring (7) are provided with a wire outlet groove (3), and the wire outlet groove (3) is provided with a notch to hold the power cord.

9. The dustproof structure according to claim 8, characterized in that: The fan frame assembly (1) also includes a square outer frame (101) and several strip brackets (103) connecting the square outer frame (101) and the base plate (102). One of the strip brackets (103) is provided with a snap-fit ​​part (16), which is located on the radial outside of the wire outlet groove (3) on the outer retaining ring (7).

10. A fan, characterized in that: Includes the dustproof structure as described in any one of claims 1-9.

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