Fan with middle pipe in convex structure

Abstract

The utility model discloses a fan with a middle tube in a convex structure, which comprises a fan frame, fan blades, a PCB (printed circuit board) and a motor, and the PCB and a stator of the motor are mounted in the fan frame; a base is arranged on the back face of the fan frame, a middle pipe is arranged on the base, the fan blades are connected with a shaft core, and the shaft core is installed in the middle pipe through a front bearing and a rear bearing. The tail end of the middle pipe extends backwards out of the base by a section to form a circle of convex ring, the rear bearing is installed in the convex ring, and the tail end of the shaft core extends into the convex ring to be connected with the rear bearing. The middle pipe is lengthened to enable the tail end of the middle pipe to extend out of the base to form the convex ring of a convex structure, so that the air inlet space behind the fan can be fully utilized, the number of rear bearings can be increased, bearings with larger diameters can be installed, the abrasion resistance of the rear bearings is improved, the rear bearing can be applied to fans of larger types, and the service life of the rear bearings is prolonged. And the service life of the fan can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a fan that can be used in products such as communication industry, computer cases, and electrical cabinets. Background Technology

[0002] A fan typically includes a fan frame, fan blades, and a motor. The fan blades are connected to a shaft, on which two bearings, one front and one rear, are fixed. The fan blades are assembled to the motor via the front and rear bearings, allowing the motor to drive the blades to rotate. When the fan is working, air enters from the intake side (front) and exits from the exhaust side (rear), creating wind. As the air is blown out, it reacts against the fan blades, generating a counterforce. This results in the rear bearing bearing significant friction. Currently, most fans on the market use the same size for both the front and rear bearings, meaning they have the same diameter. Under prolonged exposure to high friction, the rear bearing typically wears more than the front bearing, causing the fan's lifespan to fall short of its intended lifespan. To address this, Chinese utility model patent CN202223554436.4 discloses an improved fan that increases the outer diameter and thickness of the rear bearing compared to the front bearing, enabling the rear bearing to withstand greater friction and thus improving its wear resistance. However, for some small and thin fans, the limitations of thickness and inner diameter make it difficult to make the diameter and thickness of the rear bearing significantly larger. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing a central tube convex structure fan with a simple structure, more reasonable design, and the ability to increase the number and diameter of the rear bearings, thereby extending the service life of the rear bearings.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a fan with a central tube convex structure, including a fan frame, fan blades, a PCB board and a motor, wherein the PCB board and the stator of the motor are installed in the fan frame; the back of the fan frame has a base, and a central tube is provided on the base; the fan blades are connected to a shaft core, and the shaft core is installed in the central tube through front and rear bearings; the characteristic is that the tail end of the central tube extends backward beyond the base to form a convex ring, the rear bearing is installed in the convex ring, and the tail end of the shaft core extends into the convex ring and connects with the rear bearing.

[0005] Furthermore, the inner diameter of the convex ring is larger than the inner diameter of the main body of the middle tube, so that the diameter of the rear bearing is larger than the diameter of the front bearing; the convex ring and the main body of the middle tube are an integral structure.

[0006] Furthermore, a retaining groove is provided on the outer wall of the convex ring, and a retaining ring protruding towards the convex ring is provided in the base at the position opposite to the retaining ring. The convex ring and the base are connected and fixed by the retaining ring being inserted into the retaining groove.

[0007] Furthermore, a stop ring protruding from the inner and outer surfaces of the base is provided at the tail of the retaining ring, and the stop ring abuts against the outer wall of the convex ring.

[0008] Preferably, a rear bearing is provided inside the convex ring through the cooperation of a gasket.

[0009] Alternatively, two rear bearings can be installed inside the convex ring through the fit of gaskets, and the two rear bearings can be arranged in a stacked structure.

[0010] Furthermore, an inwardly protruding inner step is provided on the inner wall of the front section of the central tube, through which the front bearing is installed and fixed.

[0011] Furthermore, the part where the convex ring connects to the tail end of the main body of the central tube forms an outwardly protruding step, and the PCB board is fitted onto the central tube and abuts against this outward step.

[0012] This invention elongates the central tube so that its tail end extends beyond the base to form a convex ring with a convex structure. This allows for more efficient use of the air intake space behind the fan, increasing the number of rear bearings and allowing for the installation of larger diameter bearings by enlarging the diameter of the convex ring. This improves the wear resistance of the rear bearings, making it suitable for use in larger fan models and extending the fan's lifespan, preventing premature damage due to greater wear on the rear bearings. Attached Figure Description

[0013] Figure 1 This is a cross-sectional schematic diagram of the single rear axle bearing used in this utility model;

[0014] Figure 2 This is a schematic cross-sectional view of the central tube;

[0015] Figure 3 This is a cross-sectional schematic diagram of the double rear bearings used in this utility model.

[0016] In the diagram, 1 is the fan frame, 2 is the fan blade, 3 is the base, 31 is the retaining ring, 32 is the stop ring, 4 is the middle tube, 41 is the convex ring, 42 is the retaining groove, 43 is the inner step, 44 is the outer step, 51 is the front bearing, 52 is the first rear bearing, 53 is the second rear bearing, 6 is the stator, 7 is the shaft core, 8 is the gasket, and 9 is the PCB board. Detailed Implementation

[0017] In this embodiment, refer to Figure 1 , Figure 2 and Figure 3The fan with a convex structure includes a fan frame 1, fan blades 2, a PCB board 9, and a motor. The PCB board 9 and the stator 6 of the motor are installed in the fan frame 1. The back of the fan frame 1 has a base 3, and a central tube 4 is provided on the base 3. The fan blades 2 are connected to a shaft core 7, and the shaft core 7 is installed in the central tube 3 through front and rear bearings. The tail end of the central tube 4 extends backward beyond the base 3 to form a convex ring 41. The rear bearing is installed in the convex ring 41, and the tail end of the shaft core 7 extends into the convex ring 41 and connects with the rear bearing.

[0018] The inner diameter of the convex ring 41 is larger than the inner diameter of the main body of the middle tube 4, so that the diameter of the rear bearing is larger than the diameter of the front bearing 51; the convex ring 41 and the main body of the middle tube 4 are an integral structure and can be made of copper tube.

[0019] A groove 42 is provided on the outer wall of the convex ring 41. A retaining ring 31 protruding towards the convex ring 41 is provided in the base 3 at the position opposite to the retaining ring 42. The convex ring 41 and the base 3 are connected and fixed by the retaining ring 31 being inserted into the groove 42. The combination of the two can be achieved by in-mold injection molding.

[0020] A stop ring 32 protruding from the inner and outer surfaces of the base 3 is provided at the tail of the retaining ring 31. The stop ring 32 abuts against the outer side wall of the convex ring 41, which can improve the bonding strength between the middle tube 4 and the base 3.

[0021] like Figure 1 As shown, a rear bearing, namely the first rear bearing 52, is provided inside the convex ring 41 through the cooperation of the gasket 8.

[0022] Or, such as Figure 3 As shown, two rear bearings, namely the first rear bearing 52 and the second rear bearing 53, are provided inside the convex ring 41 through the cooperation of the gasket 8. The two rear bearings are arranged in a stacked structure, and the second rear bearing 53 is on the back of the first rear bearing 52.

[0023] An inwardly protruding inner step 43 is provided on the inner wall of the front section of the middle tube 4, and the front bearing 51 is installed and fixed through the inner step 43.

[0024] The part where the convex ring 43 connects to the tail end of the main body of the middle tube 4 forms an outwardly protruding outer step 44. The PCB board 9 is fitted onto the middle tube 4 and abuts against the outer step 44.

[0025] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.

Claims

1. A fan with a central tube convex structure, comprising a fan frame, fan blades, a PCB board, and a motor, wherein the PCB board and the motor stator are mounted in the fan frame; the back of the fan frame has a base, a central tube is disposed on the base, the fan blades are connected to a shaft, and the shaft is mounted inside the central tube via front and rear bearings, characterized in that: The tail end of the central tube extends backward beyond the base to form a convex ring. The rear bearing is installed in the convex ring, and the tail end of the shaft extends into the convex ring to connect with the rear bearing.

2. The fan with a convex central tube structure according to claim 1, characterized in that: The inner diameter of the convex ring is larger than the inner diameter of the main body of the middle tube, so that the diameter of the rear bearing is larger than the diameter of the front bearing; the convex ring and the main body of the middle tube are an integral structure.

3. The fan with a convex central tube structure according to claim 1, characterized in that: A groove is provided on the outer wall of the convex ring, and a retaining ring protruding towards the convex ring is provided in the base at the position opposite to the groove. The convex ring is connected and fixed to the base by the retaining ring being inserted into the groove.

4. The fan with a convex central tube structure according to claim 3, characterized in that: A stop ring is provided at the tail of the retaining ring, protruding from the inner and outer surfaces of the base, and the stop ring abuts against the outer wall of the convex ring.

5. The fan with a convex central tube structure according to claim 1, characterized in that: A rear bearing is installed inside the convex ring through the fit of a gasket.

6. The fan with a convex central tube structure according to claim 1, characterized in that: Two rear bearings are installed inside the convex ring through the fit of gaskets, and the two rear bearings are arranged in a stacked structure.

7. The fan with a convex central tube structure according to claim 1, characterized in that: An inwardly protruding inner step is provided on the inner wall of the front section of the tube, and the front bearing is installed and fixed through this inner step.

8. The fan with a convex central tube structure according to claim 2, characterized in that: The part where the convex ring connects to the tail end of the main body of the tube forms an outward protruding step, and the PCB board is fitted onto the tube and abuts against this outward step.

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