Bearing linkage type convex structure fan

Abstract

The bearing linkage type draught fan of the convex structure 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, the number of the rear bearings is at least one, the tail end of the middle pipe extends backwards out of the base by a section to form a circle of convex ring, and the rear bearings are installed in the convex ring; an outer spring and an inner spring are arranged in the middle pipe, the outer spring abuts against the position between the middle pipe 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 reverse thrust borne by the rear bearing can be transmitted to the front bearing when the fan blades rotate at a high speed, so that stress balance of the front bearing and the rear bearing is kept; and the basically same abrasion degree is achieved. The middle pipe is lengthened, so that the tail end of the middle pipe extends out of the base to form a convex structure, the space behind the fan can be fully utilized, and a bearing with a larger size can be conveniently installed.

Description

Technical Field

[0001] The present invention relates to the technical field of fans and blowers, and particularly to an industrial fan that can be used in products such as the communication industry, supercomputers, servers, UPSs, industrial control industries, new energy, automobiles, charging piles, air purifiers, and intelligent electrical cabinets. Background Art

[0002] In general, fans / blowers are used for heat dissipation inside products such as electrical equipment. A fan generally includes a fan frame, fan blades, a motor, etc. A rotating shaft is connected in the fan blades, and two bearings, one in front and one behind, are fixed on the rotating shaft. The fan blades can be driven by the motor to rotate through the front bearing and the rear bearing being assembled with the motor and the fan frame respectively. When the fan is working, air enters from the air inlet side (front side) and blows out from the air outlet side (rear side) to form wind. When the air blows out, it will act on the fan blades in the opposite direction, generating a reaction force on the fan blades. This reaction force is mainly borne by the rear bearing. This will cause the rear bearing to bear a large frictional force. Under the condition of bearing a large frictional force for a long time, the wear of the rear bearing is usually greater than that of the front bearing, which will affect the service life of the fan. For this reason, Chinese invention patent CN202223554436.4 discloses an improved fan, which makes the outer diameter and thickness of the rear bearing larger than those of the front bearing, so that the rear bearing can bear greater friction than the front bearing and improve the wear resistance of the rear bearing. However, in this kind of fan, only the rear bearing bears the reaction force generated when the fan blades are working. For high-power blowers, it is still difficult to meet the requirements only by increasing the size of the rear bearing. In addition, for some small and thin fans, due to the limitations of the thickness and inner diameter dimensions, it is difficult to make the diameter and thickness of the rear bearing significantly larger. Summary of the Invention

[0003] The present invention aims at the defects of the prior art and provides a bearing linkage convex structure blower with a more reasonable structural design, in which the reaction force of the fan blades can be transmitted to the front bearing through the rear bearing, so that the wear degrees of the front and rear bearings can be kept balanced and the service life can be improved, especially suitable for thin blowers.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: A bearing-linked convex-structured fan, comprising a fan frame, fan blades, a PCB board and a motor. The PCB board and the stator of the motor are installed in the fan frame; the back of the fan frame has a base, a middle tube is arranged on the base, the fan blades are connected with a shaft core, and the shaft core is installed in the middle tube through a front bearing and a rear bearing; there are at least two front bearings, and each front bearing is installed in the middle tube in a front-to-back stacked manner to form a front bearing group; there is at least one rear bearing, the tail end of the middle tube extends backward beyond the base to form a convex ring, and the rear bearing is installed in this convex ring, and the tail end of the shaft core extends into the convex ring to be connected with the rear bearing; an outer spring and an inner spring are respectively arranged in the middle tube, the outer spring abuts between the middle tube and the inner rear bearing, the inner spring abuts between the inner front bearing and the rear bearing, and the supporting force of the outer spring on the rear bearing is greater than the supporting force of the inner spring on the rear bearing.

[0005] Further, there are two front bearings, namely a first front bearing and a second front bearing, and there is one rear bearing. The second front bearing is located behind the first front bearing opposite to the rear bearing, and the rear end of the rear bearing is fixed by a gasket in cooperation with a snap ring.

[0006] Further, 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 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 respectively abut against the inner ring of the second front bearing and the inner ring of the rear bearing.

[0007] Further, 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.

[0008] Preferably, the first front bearing and the second front bearing have the same size, and the outer diameter of the rear bearing is 1.2 - 2 times the outer diameter of the two front bearings. For example, the outer diameter of the front bearing is 6.1 mm, and the thickness of the rear bearing is 8.2 mm.

[0009] Further, the length of the inner spring is greater than the length of the outer spring, and the elastic force of the outer spring is greater than the elastic force of the inner spring.

[0010] Further, the inner diameter of the convex ring is greater than the inner diameter of the main body part of the middle tube, so that the diameter of the rear bearing is greater than the diameter of the front bearing; the convex ring and the main body part of the middle tube are of an integral structure.

[0011] Further, a groove is arranged on the outer wall of the convex ring, and a snap ring protruding towards the convex ring is arranged at a position opposite to the groove in the base. The convex ring and the base are connected and fixed by snapping the snap ring into the groove.

[0012] Further, a retaining ring protruding from the inner and outer surfaces of the base is provided at the tail of the card ring, and the retaining ring abuts against the outer side wall of the convex ring.

[0013] Further, an outer step protruding outward is formed at the connection part of the convex ring and the tail end of the main body of the middle tube, and the PCB board is sleeved on the middle tube and abuts against this outer step.

[0014] In the present invention, at least two front bearings are provided in the front part of the middle tube, and at least one rear bearing is provided in the rear part. Springs are respectively provided between the rear bearing and the middle tube, and between the rear bearing and the front bearings. When the fan blades rotate at high speed, when the reverse thrust received by the rear bearing reaches a certain value, it will be transmitted to the front bearings through the cooperation of the springs, so as to maintain the force balance between the front and rear bearings, so that the wear degrees of the rear bearing and the front bearings can reach basically the same level, thus improving the service life of the fan. In addition, by making the middle tube longer so that its tail end extends out of the base to form a convex ring with a convex structure, the air inlet space behind the fan can be utilized more fully, not only can the number of rear bearings be increased, but also the diameter of the convex ring can be enlarged to install bearings with larger sizes, which is beneficial to be applied to fans of larger models and is beneficial to further improve the service life of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic cross-sectional view of the present invention;

[0016] Figure 2 is Figure 1 a partial enlarged view of

[0017] Figure 3 is a schematic cross-sectional view of the middle tube.

[0018] In the figure, 1 is the fan frame, 2 is the fan blade, 21 is the shaft core, 3 is the base, 31 is the card ring, 32 is the retaining ring, 4 is the middle tube, 41 is the convex ring, 42 is the card slot, 43 is the front step, 44 is the rear step, 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 gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In this embodiment, with reference to Figures 1 - 3, the bearing-linked convex structure fan includes a fan frame 1, fan blades 2, a PCB board 8 and a motor. The PCB board 8 and the stator 7 of the motor are installed in the fan frame 1; the back of the fan frame 1 has a base 3, and a middle tube 4 is provided on the base 3. The fan blade 2 is connected to a shaft core 21, and the shaft core 21 is installed in the middle tube 4 through a front bearing and a rear bearing 53; the front bearing includes two, namely a first front bearing 51 and a second front bearing 52, and the two front bearings are installed in the middle tube 4 in a front-to-back stacked manner to form a front bearing group; the rear bearing 53 includes one, the second front bearing 52 is located behind the first front bearing 51 and opposite to the rear bearing 53, and the rear end of the rear bearing 53 is fixed by a gasket 9 and a snap ring. The tail end of the middle tube 4 extends backward 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 is connected to the rear bearing 53; an outer spring 61 and an inner spring 62 are respectively arranged in the middle tube 4, and the outer spring 61 abuts between the middle tube 4 and the inner rear bearing 53, and the inner spring 62 abuts between the second front bearing 52 and the rear bearing 53.

[0020] The supporting force of the outer spring 61 on the rear bearing 53 is greater than the supporting force of the inner spring 62 on the rear bearing 53. When the fan runs at a normal low speed, the reaction force received by the fan blade 2 is relatively small, and the pre-pressure of the inner spring 62 > the outer spring 61, that is, at this time, mainly the outer spring 61 abuts against the rear bearing 53, and the first front bearing 51 and the rear bearing 53 are mainly stressed, and the force of the rear bearing 53 is basically not transmitted to the second front bearing 52. When the fan speed increases, the reaction force received by the fan blade 2 becomes larger, and the pre-pressure of the inner spring 62 < the outer spring 61. At this time, both the inner spring 62 and the outer spring 61 are compressed, and the force received by the rear bearing 53 is conducted 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 are stressed simultaneously, thereby balancing the forces on the front and rear bearings during the high-speed operation of the fan and improving the life and reliability of the fan during high-speed operation.

[0021] A front step 43 is provided on the inner wall of the front section of the middle tube 4, 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 43; a rear step 44 is provided on the inner wall of the rear section of the middle tube 4, the front end of the outer spring 61 abuts against the rear step 44, and the rear end abuts against the outer ring of the rear bearing 53; the front and rear ends of the inner spring 62 respectively abut against the inner ring of the second front bearing 52 and the inner ring of the rear bearing 53, so that the second front bearing 52 and the rear bearing 53 are linked.

[0022] The outer spring 61 is arranged 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.

[0023] 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 - 2 times the outer diameter of the two front bearings. For example, if the outer diameter of the two front bearings is 8 mm, the outer diameter of the rear bearing is 12 mm.

[0024] 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 greater than the elastic force of the inner spring 62.

[0025] The inner hole diameter of the convex ring 41 is larger than the inner hole diameter of the main body part 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 part of the middle tube 4 are of an integral structure.

[0026] A circle of card slots 42 is provided on the outer wall of the convex ring 41, and a circle of retaining rings 31 protruding towards the convex ring 41 is provided at a position opposite to the card slots 42 in the base 3. The convex ring 41 is connected and fixed to the base 3 by the retaining rings 31 being snapped into the card slots 42.

[0027] A circle of abutting rings 32 protruding from the inner and outer surfaces of the base 3 is provided at the tail of the retaining ring 31, and the abutting rings 32 abut against the outer side wall of the convex ring 41.

[0028] A circle of outer steps protruding outwards is formed at the connection part of the convex ring 41 and the tail end of the main body part of the middle tube 4. The PCB board 8 is sleeved on the middle tube 4 and abuts against the outer steps.

[0029] The present invention has been described in detail above. The above description is only the preferred embodiment of the present invention, and it cannot limit the scope of implementation of the present invention. That is, all equal changes and modifications made according to the scope of this application should still fall within the scope covered by the present invention.

Claims

1. A bearing-linked convex structure fan, comprising a fan frame, fan blades, a PCB board and a motor, wherein the PCB board and the stator of the motor are mounted on the fan frame; the back of the fan frame is provided with a base, a middle tube is arranged on the base, the fan blades are connected with an axis core, and the axis core is mounted in the middle tube through a front bearing and a rear bearing, wherein: The front bearings include at least two, each of which is installed in the middle tube in a front-to-rear stacking manner to form a front bearing group; the rear bearing includes at least one, the tail end of the middle tube extends rearwards 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 is connected to the rear bearing; an outer spring and an inner spring are respectively arranged in the middle tube, the outer spring is pressed between the middle tube and the inner rear bearing, and the inner spring is pressed between the inner front bearing and the rear bearing, and the supporting force of the outer spring on the rear bearing is greater than the supporting force of the inner spring on the rear bearing.

2. The bearing-linked convex structure fan according to claim 1 is characterized in that: The front bearings include two, namely 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 gasket and a snap ring.

3. The bearing-linked convex structure fan according to claim 2 is characterized in that: A circle of front steps is arranged 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 steps; a circle of rear steps is arranged on the inner wall of the rear section of the middle tube, the front end of the outer spring presses against the rear steps, and the rear end presses against the outer ring of the rear bearing; the front and rear ends of the inner spring press against the inner ring of the second front bearing and the inner ring of the rear bearing respectively.

4. The bearing-linked convex structure fan according to claim 3 is characterized in that: 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.

5. The bearing-linked convex structure fan according to claim 2, characterized in that: The first front bearing has the same size as the second front bearing, and the outer diameter of the rear bearing is 1.2-2 times the outer diameters of the two front bearings.

6. The bearing-linked convex structure fan according to claim 1, characterized in that: The length of the inner spring is greater than the length of the outer spring, and the elastic force of the outer spring is greater than the elastic force of the inner spring.

7. The fan with a central tube convex 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 integrated structure.

8. The fan with a central tube convex structure according to claim 1, characterized in that: A circle of clamping grooves is arranged on the outer wall of the convex ring, and a circle of clamping rings protruding toward the convex rings is arranged at a position opposite to the clamping grooves in the base, and the convex rings are connected and fixed to the base by clamping the clamping rings into the clamping grooves.

9. The fan with a central tube convex structure according to claim 8, characterized in that: A stop ring is arranged at the tail of the clamping ring and protrudes from the inner and outer surfaces of the base, and the stop ring abuts against the outer side wall of the convex ring.

10. The fan with a central tube convex structure according to claim 7, characterized in that: The portion where the convex ring is connected to the rear end of the middle tube main body forms a circle of outer steps protruding outwards, and the PCB board is sleeved on the middle tube and abuts against the outer steps.

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