Electric-corrosion-resistant bearing fan and assembling method thereof

Abstract

The bearing electrocorrosion-resistant fan comprises a fan frame, a metal pipe, a stator, a PCB and an integrated rotating shaft fan blade structure, a mounting part is arranged in the fan frame, the inner side of the mounting part is connected with an insulating part, the metal pipe is arranged in the mounting part, a passing area is arranged on the metal pipe, and the rotating shaft fan blade structure is arranged in the passing area. The outer wall of the insulation part is arranged on the inner side of the metal pipe and attached to the inner wall of the metal pipe, the insulation part comprises a first part, the first part penetrates through the passing area and is connected with the installation part, the stator is arranged on the installation part in a sleeving mode, the PCB is arranged on the fan frame and connected with the stator, and the integrated rotating shaft fan blade structure is arranged in the fan frame and rotationally connected into the insulation part. The device has the advantages of being low in cost, convenient to assemble, capable of effectively reducing the electrocorrosion risk and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of fans, and in particular relates to a fan with electric corrosion resistance of bearings and an assembly method thereof. Background Art

[0002] The application of cooling fans in daily life has been very extensive. For example, the new energy industry requires a large number of cooling fans. The cooling fans in the new energy industry have the characteristics of high power and high speed, and bearing electrical corrosion often occurs. As the power of charging piles becomes higher and higher, in order to meet the heat dissipation requirements of charging piles, the speed of cooling fans is also getting higher and higher. The increase in the frequency of magnetic field switching inside the fan leads to an increase in shaft voltage; in addition, the increase in speed makes the grease between the ball and the raceway thinner, and the insulation withstand voltage of the grease deteriorates. The superposition of these two factors makes it easier to generate shaft current in the circuit, and the problem of bearing electrical corrosion is also more serious. According to research, bearing electrical corrosion is mainly caused by shaft current, which comes from shaft voltage. The generation mechanism of shaft voltage, shaft current and bearing electrical corrosion is as follows: 1. Shaft voltage: When the motor is running, the imbalance of the stator magnetic field will generate an alternating electromagnetic field, which will induce an AC voltage difference between the metal tube or metal shaft core and the bearing. On the other hand, during the operation of the motor, the friction between the rotor assembly and the air will cause static charge to be generated on the rotor assembly, and the gradual accumulation of static charge will cause a DC voltage difference between the shaft core and the bearing. These two voltage differences are called shaft voltages; 2. Shaft current: The metal shaft core, bearing inner ring, balls and grease, bearing outer ring, and metal middle tube constitute a potential current loop. When the shaft voltage exceeds the insulation withstand voltage of the grease, it will break down the grease to produce capacitive breakdown discharge, forming a current loop to generate shaft current. The shaft current will cause surface fatigue damage to the balls and raceways and gradual aging of the grease; 3. Bearing electrical corrosion: When the shaft current is large, spark discharge will occur, causing melting corrosion in the point contact area between the balls and raceways (inner ring or outer ring), which is the electrical corrosion phenomenon of the bearing. In addition, spark discharge will also cause the grease to deteriorate faster, leading to premature failure of the bearing; 4. Hazards of bearing electrical corrosion: Bearing electrical corrosion will cause abnormal vibration of the bearing, deterioration of the grease, and early failure of the bearing, which will in turn cause increased vibration and noise of the fan. In severe cases, the bearing will burn out, causing the fan to get stuck and lose its heat dissipation capacity.

[0003] For example, patent application No. 202323356347.3 discloses a fan that is resistant to falling and anti-bearing electrical corrosion, which includes an outer frame, a middle tube and an axis core, the middle tube and the axis core are both metal parts, the surfaces of the axis core and the middle tube have an aluminum layer, a ceramic layer is formed on the surface of the aluminum layer, an insulating spacer ring is provided in the middle tube so that two bearing chambers for installing bearings are formed in the middle tube corresponding to the two ends of the insulating spacer ring. The fan that is resistant to falling and anti-bearing electrical corrosion resists electrical corrosion by forming a ceramic layer on the surface of the aluminum layer. It is difficult to process and has high cost. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a bearing electrical corrosion resistant fan which is low in cost and easy to process and assemble, and an assembling method thereof.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] Bearing electric corrosion resistant fan, including:

[0007] The fan frame has a mounting portion in it, and an insulating portion is connected to the inner side of the mounting portion;

[0008] The metal tube is arranged in the installation part, a through area is arranged on the metal tube, the outer wall of the insulating part is arranged inside the metal tube and is in contact with the inner wall of the metal tube, and the insulating part includes a first part, and the first part passes through the through area and is connected with the installation part;

[0009] A stator is sleeved on the mounting portion;

[0010] A PCB board is arranged on the fan frame and connected to the stator;

[0011] And an integrated rotating shaft fan blade structure is arranged in the fan frame and rotatably connected in the insulating part.

[0012] Preferably, the integrated rotating shaft fan blade structure includes a fan blade portion, a shell portion and an axis core, the shell portion is arranged in the fan blade portion, a plurality of fan blades are arranged on the fan blade portion, one end of the axis core passes through the fan blade portion and is connected to the shell portion, the other end of the axis core extends into the insulating portion, and the fan blade portion is arranged in the fan frame and is sleeved on the stator.

[0013] Preferably, the shaft core is rotatably connected in the insulating part through the first bearing and the second bearing, the first bearing and the second bearing are arranged on the shaft core with an interval up and down, and the outer walls of the first bearing and the second bearing are both in contact with the insulating part.

[0014] Preferably, the metal tube is a copper tube, a spring is provided between the first bearing and the fan blade part, the spring sleeve is arranged on the shaft core, a groove is provided at one end of the shaft core away from the shell part, a retaining spring is provided in the groove, and the retaining spring is located on the lower side of the second bearing.

[0015] Preferably, it also includes a first gasket and a second gasket, both of which are arranged on the shaft core, the first gasket is located between the first bearing and the spring, and the second gasket is located between the retaining spring and the second bearing.

[0016] Preferably, it also includes a rubber magnet, which is arranged in the fan blade part and is in contact with the fan blade part, and the rubber magnet sleeve is arranged on the stator.

[0017] Preferably, the shaft core is a ceramic shaft core.

[0018] The present invention also discloses an assembly method of a bearing electric corrosion resistant fan, comprising the following steps:

[0019] S1. Take a fan frame, then take a metal tube and place the metal tube in the mounting portion of the fan frame, then place an insulating portion in the metal tube so that the insulating portion is connected to the mounting portion;

[0020] S2, take the rubber magnet, make the rubber magnet contact with the fan blade part of the integrated shaft fan blade structure, then take the stator and the PCB board, put them on the installation part, and then connect the stator and the PCB board;

[0021] S3, take the spring, the first bearing, the second bearing and the retaining spring, and then sleeve the spring, the first bearing, the second bearing and the retaining spring on the shaft core, and then extend the shaft core, the spring, the first bearing, the second bearing and the retaining spring into the mounting part, so that the outer walls of the first bearing and the second bearing are in contact with the insulating part.

[0022] By adopting the above technical solution, the present invention has the following beneficial effects:

[0023] (1) In the present invention, an insulating portion is provided on the mounting portion, and the insulating portion is provided on the inner side of the metal tube. The first bearing and the second bearing are both in contact with the insulating portion. When in use, the first bearing and the second bearing do not contact the metal tube, and no current loop is formed. Therefore, the risk of electrical corrosion can be greatly reduced. Compared with the prior art, there is no need to use aluminum layers, ceramic layers, etc. to prevent electrical corrosion, which is low in cost and easy to process and assemble.

[0024] (2) The shaft core of the present invention may be a ceramic shaft core, which is convenient for further reducing the risk of electrical corrosion;

[0025] (3) The integrated shaft and blade structure of the present invention is an integrated structure, which is easy to assemble;

[0026] In summary, the present invention has the advantages of low cost, easy assembly, and effective reduction of electrical corrosion risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0030] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1

[0034] In this embodiment, a fan with electric corrosion resistance of bearings and an assembly method thereof are proposed, which can cut off the current loop formed inside the bearings to prevent electric corrosion of the bearings.

[0035] like Figure 1As shown, in one embodiment of the present invention, the bearing electric corrosion resistant fan of the present invention includes a fan frame 1, a metal tube 2, a stator 3, a PCB board 4 and an integrated rotating shaft fan blade structure, wherein a mounting portion 11 is provided in the fan frame 1, an insulating portion 12 is connected to the inner side of the mounting portion 11, the metal tube 2 is arranged in the mounting portion 11, a passing area is provided on the metal tube 2, the outer wall of the insulating portion 12 is arranged on the inner side of the metal tube 2 and fits with the inner wall of the metal tube 2, the insulating portion 12 includes a first part 121, the first part 121 passes through the passing area and is connected to the mounting portion 11, the stator 3 is sleeved on the mounting portion 11, the PCB board 4 is arranged on the fan frame 1 and is connected to the stator 3, and the integrated rotating shaft fan blade structure is arranged at The fan frame 1 is rotatably connected to the insulating portion 12, wherein the mounting portion 11 is cylindrical as a whole and is open up and down along the cylindrical direction of the mounting portion 11, that is, the mounting portion 11 is hollow, and a static blade is provided on the lower side of the fan frame 1. The insulating portion 12 can be made of insulating material as a whole. The metal tube 2 can be a copper tube or other structure. The copper tube is arranged in the hollow area of ​​the mounting portion 11. The copper tube is specifically provided with a through area. The outer wall of the insulating portion 12 is arranged on the inner side of the copper tube and fits with the inner wall of the copper tube. The insulating portion 12 includes a first part 121, and the first part 121 passes through the through area and is connected to the mounting portion 11. The connection line of the PCB board 4 of the present invention passes through the fan frame 1 or even the outside of the fan frame 1.

[0036] Please continue to refer to Figure 1The integrated rotating shaft fan blade structure of the present invention comprises a fan blade portion 5, a shell portion 6 and an axis core 7. The shell portion 6 is arranged in the fan blade portion 5. A plurality of fan blades 51 are arranged on the fan blade portion 5. The plurality of fan blades 51 can be evenly arranged. One end of the axis core 7 passes through the fan blade 51 portion 5 and is connected to the shell portion 6. The other end of the axis core 7 extends into the insulating portion 12. The fan blade 51 portion 5 is arranged in the fan frame 1 and is sleeved on the stator 3. The shell portion 6 and the axis core 7 can both be metal structures, or the axis core 7 can be a ceramic axis core 7. The ceramic axis core 7 is conducive to reducing electrical corrosion. The integrated rotating shaft fan structure of the present invention The blade 51 structure can be integrally formed, that is, the shaft core 7, the blade 51 part 5 and the shell part 6 are injection molded together by an injection molding process, the shaft core 7 is rotatably connected to the insulating part 12 through the first bearing 8 and the second bearing 9, the first bearing 8 and the second bearing 9 are arranged on the shaft core 7 at intervals, and the outer walls of the first bearing 8 and the second bearing 9 are both in contact with the insulating part 12. The first bearing 8, the second bearing 9, the insulating part 12 and the metal tube 2 of the present invention are adapted to each other, the first bearing 8 and the second bearing 9 are located at appropriate positions in the insulating part 12, and the first bearing 8 and the blade A spring 1000 is provided between the blade 51 part 5, and the spring 1000 is sleeved on the shaft core 7. A slot is provided at one end of the shaft core 7 away from the housing part 6, and a retaining spring 1001 is provided in the slot. The retaining spring 1001 is located at the lower side of the second bearing 9. The present invention also includes a rubber magnet, which is arranged in the fan blade 51 part 5 and is in contact with the fan blade 51 part 5. The rubber magnet is sleeved on the stator 3. The present invention also includes a first gasket 2000 and a second gasket 3000. The first gasket 2000 and the second gasket 3000 are both arranged on the shaft core 7. The first gasket 2000 is located between the first bearing 8 and the spring 1 000, the second gasket 3000 is located between the retaining spring 1001 and the second bearing 9. In the present invention, the area of ​​the spring 1000 close to the blade portion 5 that contacts the blade portion 5 is a plastic area, that is, the shell portion 6 is injection molded in the blade portion 5, and the shaft core 7 passes through the blade portion 5 and is connected to the shell portion 6. The side of the spring 1000 close to the shell portion 3 directly contacts the blade portion 2. The first gasket 2000 and the second gasket 3000 can both be insulating gaskets. The spring 1000 is not in direct contact with the first bearing 8, and the retaining spring 1001 is not in direct contact with the second bearing 9.

[0037] In the present invention, the first bearing 8, the second bearing 9 and the metal tube 2 are insulated by the setting of the insulating part 12, the first gasket 2000 and the second gasket 3000, thereby destroying the electrical circuit between the shaft core 7, the bearing and the metal tube 2 in the prior art, reducing the occurrence of electrical corrosion. On this basis, selecting a ceramic shaft core 7, especially a non-conductive ceramic shaft core 7 is more conducive to reducing electrical corrosion.

[0038] The present invention also discloses an assembly method of a bearing electric corrosion resistant fan, comprising the following steps:

[0039] S1. Take the fan frame 1, then take the metal tube 2 and set the metal tube 2 in the mounting portion 11 of the fan frame 1, and then set the insulating portion 12 in the metal tube 2 so that the insulating portion 12 is connected to the mounting portion 11. When assembling the present invention, the insulating portion 12 may not be set first, but the metal tube 2, that is, the copper tube, is installed in the mounting portion 11 and then the insulating portion 12 is processed on the inner side of the copper tube so that the insulating portion 12 is connected to the mounting portion 11. The insulating portion 12 may be processed by injection molding, spraying, or other processes;

[0040] S2, take the rubber magnet, make the rubber magnet contact with the fan blade 51 part 5 of the integrated rotating shaft fan blade 51 structure, then take the stator 3 and the PCB board 4 and sleeve them on the mounting part 11, and then connect the stator 3 and the PCB board 4. In the present invention, the integrated rotating shaft fan blade 51 structure is integrally formed;

[0041] S3, take the spring 1000, the first bearing 8, the second bearing 9 and the retaining spring 1001, and then sleeve the spring 1000, the first bearing 8, the second bearing 9 and the retaining spring 1001 on the shaft core 7, and then extend the shaft core 7, the spring 1000, the first bearing 8, the second bearing 9 and the retaining spring 1001 into the mounting portion 11, so that the outer walls of the first bearing 8 and the second bearing 9 are in contact with the insulating portion 12.

[0042] This embodiment does not impose any formal limitation on the shape, material, structure, etc. of the present invention. Any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. Bearing electric corrosion resistant fan, characterized in that: include: The fan frame has a mounting portion in it, and an insulating portion is connected to the inner side of the mounting portion; The metal tube is arranged in the installation part, a through area is arranged on the metal tube, the outer wall of the insulating part is arranged inside the metal tube and is in contact with the inner wall of the metal tube, and the insulating part includes a first part, and the first part passes through the through area and is connected with the installation part; A stator is sleeved on the mounting portion; A PCB board is arranged on the fan frame and connected to the stator; And an integrated rotating shaft fan blade structure is arranged in the fan frame and rotatably connected in the insulating part.

2. The fan with electric corrosion resistant bearing according to claim 1, characterized in that: The integrated rotating shaft fan blade structure includes a fan blade portion, a shell portion and an axis core. The shell portion is arranged in the fan blade portion, and a plurality of fan blades are arranged on the fan blade portion. One end of the axis core passes through the fan blade portion and is connected to the shell portion, and the other end of the axis core extends into the insulating portion. The fan blade portion is arranged in the fan frame and is sleeved on the stator.

3. The fan with electric corrosion resistant bearing according to claim 2, characterized in that: The shaft core is rotatably connected in the insulating part through the first bearing and the second bearing. The first bearing and the second bearing are arranged on the shaft core at intervals, and the outer walls of the first bearing and the second bearing are both in contact with the insulating part.

4. The fan with electric corrosion resistant bearing according to claim 3, characterized in that: The metal tube is a copper tube, a spring is arranged between the first bearing and the fan blade part, the spring sleeve is arranged on the shaft core, a groove is arranged at one end of the shaft core away from the shell part, a retaining spring is arranged in the groove, and the retaining spring is located at the lower side of the second bearing.

5. The electric corrosion resistant fan with bearing according to claim 4, characterized in that: It also includes a first gasket and a second gasket, both of which are arranged on the shaft core, the first gasket is located between the first bearing and the spring, and the second gasket is located between the retaining spring and the second bearing.

6. The electric corrosion resistant fan with bearing according to claim 5, characterized in that: It also includes a rubber magnet, which is arranged in the fan blade part and is in contact with the fan blade part, and the rubber magnet sleeve is arranged on the stator.

7. The electric corrosion resistant fan with bearing according to claim 6, characterized in that: The shaft core is a ceramic shaft core.

8. The method for assembling a fan with electric corrosion resistant bearing according to claim 7, characterized in that: The following steps are involved: S1. Take a fan frame, then take a metal tube and place the metal tube in the mounting portion of the fan frame, then place an insulating portion in the metal tube so that the insulating portion is connected to the mounting portion; S2, take the rubber magnet, make the rubber magnet contact with the fan blade part of the integrated shaft fan blade structure, then take the stator and the PCB board, put them on the installation part, and then connect the stator and the PCB board; S3, take the spring, the first bearing, the second bearing and the retaining spring, and then sleeve the spring, the first bearing, the second bearing and the retaining spring on the shaft core, and then extend the shaft core, the spring, the first bearing, the second bearing and the retaining spring into the mounting part, so that the outer walls of the first bearing and the second bearing are in contact with the insulating part.

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