Linkage type bearing structure fan

Abstract

The utility model discloses a linkage type bearing structure fan which comprises a fan frame, fan blades, a PCB and a motor, 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 number of the front bearings is at least two, and the number of the rear bearings is at least one, and the rear bearings are installed on the rear portion in the middle pipe. An outer spring and an inner spring are respectively arranged in the middle pipe, the outer spring is arranged between the front bearing and the rear bearing on the inner side, the inner spring abuts against the position between the front bearing and the rear bearing on the inner side, and the supporting force of the outer spring to the rear bearing is smaller than that of the inner spring to the rear bearing. When the fan blades rotate at a high speed, reverse thrust borne by the rear bearing reaches a certain value and then is transmitted to the front bearing through cooperation of the spring, so that stress balance of the front bearing and the rear bearing is kept, the rear bearing and the front bearing can reach the basically same abrasion degree, 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 an industrial fan that can be used in products such as communications, supercomputers, servers, UPS, industrial control, new energy, automobiles, charging piles, air purifiers, and smart electrical cabinets. Background Technology

[0002] Electrical equipment and other products typically use fans for heat dissipation. A fan generally includes a fan frame, fan blades, and a motor. A shaft connects to the fan blades, and two bearings, one front and one rear, are fixed on the shaft. These bearings are then assembled with the motor and fan frame, respectively, allowing the fan blades to rotate. When the fan is working, air enters from the inlet side (front) and exits from the outlet side (rear), creating airflow. As the air is blown out, it reacts against the fan blades, generating a counter-force. This counter-force is primarily borne by the rear bearing. This results in the rear bearing bearing greater friction. Under prolonged exposure to this greater friction, the rear bearing typically wears more than the front bearing, thus affecting the fan's 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 improving its wear resistance. However, this type of fan still only has the rear bearing to bear the counter-thrust generated when the fan blades are working. For high-power fans, simply increasing the size of the rear bearing is still insufficient to meet the requirements. Utility Model Content

[0003] This utility model aims to address the shortcomings of existing technologies by providing a linked bearing structure fan with a more reasonable structural design, in which the blade thrust can be transmitted to the front bearing through the rear bearing, thus maintaining a balance in the wear of the front and rear bearings and improving their service life.

[0004] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a linked bearing structure fan, 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 a front bearing and a rear bearing; the front bearing includes at least two, and each front bearing is installed in the central tube in a stacked manner to form a front bearing assembly; the rear bearing includes at least one, and the rear bearing is installed in the rear part of the central tube, with the tail end of the shaft core connected to the rear bearing; an outer spring and an inner spring are respectively provided in the central tube, the outer spring is located between the inner front bearing and the rear bearing, and the inner spring is pressed against the inner front bearing and the rear bearing, wherein the supporting force of the outer spring on the rear bearing is less than the supporting force of the inner spring on the rear bearing.

[0005] Furthermore, the front bearing includes two parts, namely a first front bearing and a second front bearing, and the rear bearing includes one part. The second front bearing is located behind the first front bearing and opposite to the rear bearing. The rear end of the rear bearing is fixed by a retaining ring and a retaining circumference.

[0006] Preferably, each front bearing has the same dimensions as the rear bearing.

[0007] Furthermore, a front step is provided on the inner wall of the front section of the middle tube, the first front bearing is superimposed on the second front bearing, and the second front bearing is supported by the front step; a rear step is provided on the inner wall of the rear section of the middle tube, the front end of the outer spring abuts against the rear step, and the rear end abuts against the outer ring of the rear bearing; the front and rear ends of the inner spring abut against the inner ring of the second front bearing and the inner ring of the rear bearing, respectively.

[0008] Furthermore, the outer spring is installed along the inner wall of the rear section of the central tube, and the inner spring is sleeved on the shaft core.

[0009] Preferably, the first front bearing and the second front bearing are the same size, and the outer diameter of the rear bearing is 1-2 times the outer diameter of the two front bearings.

[0010] Furthermore, the inner spring is longer than the outer spring, and the outer spring has less elastic force than the inner spring.

[0011] Preferably, the tail end of the central tube extends rearward beyond the base to form a convex ring, the rear bearing is installed in this convex ring, and the tail end of the shaft extends into the convex ring to connect with the rear bearing.

[0012] 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.

[0013] This invention features at least two front bearings at the front of the central tube and at least one rear bearing at the rear. Springs are installed between the rear bearing and the central tube, and between the rear bearing and the front bearing. When the fan blades rotate at high speed, the counter-thrust force on the rear bearing reaches a certain value and is transmitted to the front bearing through the springs, thereby maintaining the force balance between the front and rear bearings. This ensures that the rear and front bearings achieve essentially the same degree of wear, thus improving the service life of the fan. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the first embodiment of the present utility model;

[0015] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0016] Figure 3 This is a cross-sectional schematic diagram of the second embodiment of the present invention;

[0017] Figure 4 This is a cross-sectional schematic diagram of the third embodiment of the present utility model;

[0018] Figure 5 This is a cross-sectional schematic diagram of the fourth embodiment of the present invention.

[0019] In the diagram, 1 is the fan frame, 2 is the fan blade, 21 is the shaft core, 3 is the base, 31 is the retaining ring, 32 is the stop ring, 4 is the middle tube, 41 is the convex ring, 51 is the first front bearing, 52 is the second front bearing, 53 is the rear bearing, 61 is the outer spring, 62 is the inner spring, 7 is the stator, 8 is the PCB board, and 9 is the retaining ring. Detailed Implementation

[0020] In this embodiment, refer to Figure 1 and Figure 2 The linked bearing structure fan includes a fan frame 1, fan blades 2, a PCB board 8, and a motor. The PCB board 8 and the motor stator 7 are installed in the fan frame 1. The back of the fan frame 1 has a base 3, and a central tube 4 is installed on the base 3. The fan blades 2 are connected to a shaft core 21, and the shaft core 21 is installed in the central tube 4 through a front bearing and a rear bearing 53. There are two front bearings, namely a first front bearing 51 and a second front bearing 52, which are installed in the central tube 4 in a stacked manner to form a front bearing assembly. There is one rear bearing 53, with the second front bearing 52 located behind the first front bearing 51 and opposite to the rear bearing 53. The rear end of the rear bearing 53 is fixed by a retaining ring 9 and a retaining shackle. An outer spring 61 and an inner spring 62 are respectively installed in the central tube 4. The outer spring 61 is located between the second front bearing 52 and the rear bearing 53, and the inner spring 62 is pressed against the second front bearing 52 and the rear bearing 53.

[0021] The supporting force of the outer spring 61 on the rear bearing 53 is appropriately less than that of the inner spring 62 on the rear bearing 53. When the fan is running normally at low speed, the counter-thrust force on the fan blade 2 is small, and the preload of the inner spring 62 is greater than that of the outer spring 61. That is, at this time, the outer spring 61 mainly supports the rear bearing 53, and the first front bearing 51 and the rear bearing 53 mainly bear the force. The force of the rear bearing 53 is basically not transmitted to the second front bearing 52. When the fan speed increases, the counter-thrust force on the fan blade 2 increases, and the preload of the inner spring 62 is less than that of the outer spring 61. At this time, the inner spring 62 and the outer spring 61 are compressed together. The force on the rear bearing 53 is transmitted to the second front bearing 52 through the inner spring 62, so that the first front bearing 51, the second front bearing 52 and the rear bearing 53 bear the force simultaneously, thereby balancing the force on the front and rear bearings when the fan is running at high speed, and improving the life and reliability of the fan when running at high speed.

[0022] The first front bearing 51, the second front bearing 52, and the rear bearing 53 have the same dimensions.

[0023] A front step is provided on the inner wall of the front section of the middle tube 4 (so that the diameter of the front section of the middle tube 4 is larger to accommodate the front bearing). The first front bearing 51 is stacked on the second front bearing 52, and the second front bearing 52 is supported by the front step. A rear step is provided on the inner wall of the rear section of the middle tube 4 (so that the diameter of the rear section of the middle tube 4 is larger to accommodate the rear bearing 53 and the outer spring 61). The front end of the outer spring 61 abuts against the rear step, and the rear end abuts against the outer ring of the rear bearing 53. The front and rear ends of the inner spring 61 abut against the inner ring of the second front bearing 52 and the inner ring of the rear bearing 53, respectively.

[0024] The outer spring 61 is installed along the inner wall of the rear section of the middle tube 4, and the inner spring 62 is sleeved on the shaft core 21.

[0025] As a second implementation method, such as Figure 3 As shown, the first front bearing 51 and the second front bearing 52 have the same dimensions, and the outer diameter of the rear bearing 53 is 1-2 times the outer diameter of the two front bearings. For example, the outer diameter of the two front bearings is 8mm, and the outer diameter of the rear bearing 53 is 12mm.

[0026] The length of the inner spring 62 is greater than the length of the outer spring 61, and the elastic force of the outer spring 61 is appropriately less than the elastic force of the inner spring 62.

[0027] As a third implementation method, such as Figure 4 As shown, the tail end of the middle tube 4 extends rearward beyond the base 3 to form a convex ring 41. The rear bearing 53 is installed in the convex ring 41, and the tail end of the shaft core 21 extends into the convex ring 41 and connects with the rear bearing 53.

[0028] 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 53 is larger than the diameter of the front bearing; the convex ring 41 and the main body of the middle tube 4 are an integral structure.

[0029] As a fourth implementation method, such as Figure 5 As shown, the front end of the outer spring 61 directly abuts against the second front bearing 52, while the rear end abuts against the rear bearing 53, thus realizing the direct linkage between the rear bearing 53 and the second front bearing 52.

[0030] 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 linked bearing structure fan, 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 core, and the shaft core is mounted inside the central tube via a front bearing and a rear bearing, characterized in that: The front bearings include at least two, each of which is installed in the middle tube in a front-rear stacking manner to form a front bearing group; the rear bearing includes at least one, which is installed in the rear part of the middle tube and connected with the tail end of the shaft core; an outer spring and an inner spring are respectively arranged in the middle tube, the outer spring is arranged between the inner side of the front bearing and the rear bearing, and the inner spring is abutted between the inner side of the front bearing and the rear bearing, the supporting force of the outer spring on the rear bearing is smaller than that of the inner spring.

2. The linked bearing construction fan of claim 1, wherein: The front bearings include two, i.e. a first front bearing and a second front bearing, and the rear bearing includes one, the second front bearing is located behind the first front bearing and opposite to the rear bearing, and the rear end of the rear bearing is fixed by a snap ring through a ring cooperation.

3. The linked bearing construction fan of claim 1 or 2, wherein: The front bearings and the rear bearing have the same size.

4. The linked bearing construction fan of claim 2, wherein: A front step is arranged on the inner wall of the front section of the middle tube, the first front bearing is stacked on the second front bearing, and the second front bearing is supported by the front step; a rear step is arranged on the inner wall of the rear section of the middle tube, the front end of the outer spring is abutted against the rear step, and the rear end is abutted against the outer ring of the rear bearing; the front and rear ends of the inner spring are respectively abutted against the inner ring of the second front bearing and the inner ring of the rear bearing.

5. The linked bearing construction fan of claim 4, wherein: The outer spring is arranged along the inner wall of the rear section of the middle tube, and the inner spring is sleeved on the shaft core.

6. The linked bearing construction fan of claim 2, wherein: The first front bearing and the second front bearing have the same size, and the outer diameter of the rear bearing is 1-2 times of the outer diameter of the two front bearings.

7. The linked bearing construction fan of claim 1, wherein: The length of the inner spring is greater than that of the outer spring, and the elastic force of the outer spring is smaller than that of the inner spring.

8. The linked bearing construction fan of claim 1, wherein: The tail end of the middle tube extends out of 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 is connected with the rear bearing.

9. The linked bearing construction fan of claim 8, wherein: The inner hole diameter of the convex ring is greater than the inner hole diameter of the main body part of the middle tube, so that the diameter of the rear bearing is greater than that of the front bearing; the convex ring and the main body part of the middle tube are an integral structure.

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