Novel high-protection heat-dissipation fan

Abstract

The utility model relates to a novel high-protection heat dissipation fan, aiming at solving the technical problems that the existing similar products have less step structure through the outer diameter of the shaft core, and the oil seal is arranged in the mode of increasing the step at the corresponding upper bearing, and the rubber plug is arranged in the mode of increasing the rubber plug at the hole position of the middle pipe to ensure the internal anti-salt mist effect. The main points are that the inner diameter of the middle pipe of the frame body is sequentially provided with a first step, a second step and a third step from the upper bearing to the lower bearing, the first and second steps are connected and arranged at one end of the inner diameter of the middle pipe in the mode of reducing the inner diameter, a transition inner diameter is arranged between the second and third steps, and the third step is arranged at the other end of the inner diameter of the middle pipe; the upper bearing and the lower bearing of the outer diameter of the shaft core are respectively arranged at the second step and the third step of the inner diameter of the middle pipe, and the oil seal is arranged at the first step of the inner diameter of the middle pipe; the outer diameter of the oil seal is in interference fit with the first step of the inner diameter of the middle pipe, the lower surface of the oil seal is sealed against the upper surface of the upper bearing, and the third step of the middle pipe is provided with a rubber plug at the inner diameter of the side port.

Description

Technical Field

[0001] This utility model relates to a cooling fan, specifically a novel high-protection cooling fan. Background Technology

[0002] Cooling fans generally refer to fans used for cooling motherboard devices such as CPUs and graphics cards. Their main purpose is to conduct heat away and blow it into the surrounding air to achieve a cooling effect. Currently, high-protection cooling fans on the market mainly use two architectures: one is to mount the stator assembly and PCB board together in a sealed load-bearing protective housing, which provides sealing protection; the other uses an integrated potting or plastic encapsulation process to protect the motor and circuit board. However, other components, especially bearings, are not protected. While they may cope with less harsh environments, they are very likely to fail in extremely harsh environments. The motor housing of the fan blades is particularly prone to rust (exposed motor housing), and rust can enter the bearing surface, leading to bearing failure. In addition, because the fan blades are rotating parts, there will inevitably be gaps between the fan frame and the blades. Salt spray can enter the bearing surface through these gaps, making the bearings very prone to rust and causing the cooling fan to seize up and fail. Some cooling fans employ a salt spray-proof design using a concave-convex guide groove on the top of the inner hub of the fan blades above the motor assembly, such as patent number ZL200720060918.0 disclosed in Chinese patent literature, authorized on October 1, 2008, with the utility model title "A Waterproof and Salt Spray-Proof Cooling Fan". However, the aforementioned products and similar products rarely improve and guarantee their internal salt spray-proof effect by using a stepped structure on the outer diameter of the shaft core, adding a stepped oil seal at the corresponding upper bearing, or adding a rubber plug at the hole position of the corresponding middle tube. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a novel high-protection cooling fan in the field, which solves the technical problems of poor salt spray protection caused by the inadequate structural design of existing similar products, particularly the lack of stepped structures through the outer diameter of the shaft core, the addition of stepped oil seals at the corresponding upper bearing, and the addition of rubber plugs at the holes of the corresponding middle tube to improve and ensure the internal salt spray protection effect. This objective is achieved through the following technical solution.

[0004] A novel high-protection cooling fan includes a frame, fan blades, and a motor assembly. The inner wall of the fan blade hub is equipped with a magnet. The PCB board of the motor assembly is integrated with the winding assembly and is housed in the central tube of the frame. The motor assembly is then fixed to the outer diameter of the central tube by adhesive dispensing. The frame and motor assembly are placed together in a fixture and glued together with potting material. The motor assembly has a wire extending out of the potting material. A shaft core at the central axis inside the hub is inserted into and fixed to the central tube of the frame. The outer diameters of both ends of the shaft core inside the central tube are respectively equipped with a lower bearing and an upper bearing. The shaft core is fixed inside the central tube by a spring, a plastic gasket, and a retaining ring at the end slot, arranged sequentially at the end. The magnet on the inner wall of the hub and the coil wound on the plastic bracket of the winding assembly are spaced apart. The key structural design features a frame whose inner diameter, from the upper bearing to the lower bearing, is sequentially provided with a first step, a second step, and a third step. The first step is connected to the second step and is located at one end of the inner diameter of the frame with a reduced inner diameter. A transition inner diameter is provided between the second and third steps, and the third step is located at the other end of the inner diameter of the frame. The second and third steps of the inner diameter of the frame are respectively provided with an upper bearing and a lower bearing of the outer diameter of the shaft core. An oil seal is provided at the first step of the inner diameter of the frame. The outer diameter and inner diameter of the oil seal are respectively sealed against the outer diameter of the shaft core and the inner diameter of the frame. The ring face at one end of the oil seal is sealed against the top ring face of the upper bearing. That is, the outer diameter of the oil seal is interference-fitted with the first step of the inner diameter of the frame, and the lower surface of the oil seal is sealed against the upper surface of the upper bearing.

[0005] The upper bearing has a reduced diameter step on the outer diameter of the shaft core at its upper surface. The top seal of the inner ring of the upper bearing abuts against the lower surface of the shaft core step. At the same time, the inner diameter of the oil seal and the inner diameter of the upper bearing are interference-fitted with the circumferential surface and the lower circumferential surface of the shaft core at the shaft core step, respectively.

[0006] The oil seal is a polytetrafluoroethylene oil seal. The top of the oil seal is provided with an annular groove. The outer and inner diameter edges of the annular groove are respectively raised outward and higher than the outer circumference. The outer edge of the oil seal is higher than the inner edge of the oil seal.

[0007] A rubber stopper is provided on the inner diameter of one end of the third step of the central tube. According to existing technology, a sealing label sticker can also be further provided.

[0008] The inner diameters at the first and third steps within the central tube of the frame are identical. This structure allows identical bearings to be installed as upper and lower bearings within the central tube, respectively.

[0009] The shaft core at the center of the hub of the fan blade is fixedly installed at the center of the motor housing assembly by a bushing. At the same time, the motor housing assembly and the connection between the motor assembly and the bushing are fixedly installed in the hub by integral injection molding.

[0010] This utility model has a simple and reasonable structural design, is easy to assemble and produce, has good reliability, stability and safety, and a long service life. In particular, it effectively improves the anti-salt spray capability and strength of the shaft core in extremely harsh environments. It is suitable for use in new high-protection cooling fans for salt spray, as well as for further improvements to similar products. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the exploded state of this utility model.

[0012] Figure 2 yes Figure 1 A cross-sectional view of the assembled part.

[0013] Figure 3 yes Figure 2 A cross-sectional structural diagram showing the connection state of the inner hub shaft, bushing, and motor housing.

[0014] Figure 4 yes Figure 2 A three-dimensional structural diagram of the motor assembly.

[0015] Attached Figure Numbers and Names: 1. Frame, 101. Middle Tube, 1011. First Step, 1012. Second Step, 1013. Third Step, 2. Fan Blade, 201. Hub, 202. Motor Housing Assembly, 2021. Shaft Core, 20211. Slot, 20212. Shaft Core Step, 2022. Bushing, 2023. Motor Housing, 3. Spring, 4. Lower Bearing, 5. Upper Bearing, 6. Motor Assembly, 601. PCB Board, 602. Winding Assembly, 603. Wire, 7. Plastic Gasket, 8. Buckle, 9. Oil Seal, 10. Potting Material, 11. Rubber Plug. Implementation

[0016] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-4As shown, the cooling fan includes a frame 1, fan blades 2, and a motor assembly 6. The inner wall of the hub 201 of the fan blades is provided with a magnet. The PCB board 601 of the motor assembly is integrated with the winding assembly 602 and is set in the central tube 101 of the frame. After the motor assembly is fixed to the outer diameter of the central tube by dispensing glue, the frame and the motor assembly are placed together in a fixture and glued together by potting material 10. The motor assembly is provided with a wire 603 extending out of the potting material. The shaft core 2021 at the central shaft inside the hub is inserted into and fixed to the central tube of the frame. The outer diameters of the two ends of the shaft core inside the central tube are respectively provided with a lower bearing 4 and an upper bearing 5. The shaft core is fixed in the central tube by a spring 3, a plastic gasket 7, and a retaining ring 8 at the end of the slot 20211. The magnet on the inner wall of the hub and the coil wound on the silicon steel sheet on the plastic bracket of the winding assembly are set with relative gaps. The inner diameter of the frame's central tube is provided with a first step 1011, a second step 1012, and a third step 1013 sequentially from the upper bearing to the lower bearing. The first step is connected to the second step and is located at one end of the inner diameter of the central tube with a reduced inner diameter. A transition inner diameter is provided between the second step and the third step, and the third step is located at the other end of the inner diameter of the central tube. The second and third steps of the inner diameter of the central tube are respectively provided with an upper bearing and a lower bearing of the outer diameter of the shaft core. An oil seal 9 is provided at the first step of the inner diameter of the central tube. The outer diameter and inner diameter of the oil seal are respectively sealed against the outer diameter of the shaft core and the inner diameter of the central tube. The ring face of one end of the oil seal is sealed against the top ring face of the upper bearing. That is, the outer diameter of the oil seal is interference-fitted with the first step of the central tube, and the lower surface of the oil seal is sealed against the upper surface of the upper bearing.

[0017] The upper bearing has a reduced-diameter step 20212 on its upper surface. The top seal of the inner ring of the upper bearing abuts against the lower surface of the step. Simultaneously, the inner diameter of the oil seal and the inner diameter of the upper bearing are interference-fitted with the circumferential and lower circumferential surfaces of the shaft at the step. The oil seal is a polytetrafluoroethylene (PTFE) oil seal, with an annular groove at its top. The outer and inner edges of the annular groove curve outwards above the outer circumferential surface, and the outer edge of the oil seal is higher than its inner edge. Furthermore, a rubber plug 11 is provided on the inner diameter of one port of the third step of the middle tube. The inner diameters of the first and third steps within the middle tube of the frame are identical.

[0018] The shaft core at the center of the fan blade hub is fixedly installed at the center of the motor housing assembly 202 via the bushing 2022. At the same time, the motor housing assembly and the connection between the motor assembly and the bushing are fixedly installed in the hub by integral injection molding.

[0019] In summary, the aforementioned motor housing assembly and hub form a wraparound structure, ensuring the motor housing is completely enclosed by the hub. The frame and motor assembly are placed together in a fixture and potted with potting material to ensure the protective effect of the motor assembly. The outer diameter of the oil seal is interference-fitted with the first step of the central tube, and the lower surface of the oil seal precisely seals against the upper surface of the upper bearing, ensuring that the upper bearing will not move axially. Furthermore, the fan blades are sequentially placed into the central tube, and the size of the shaft core step is interference-fitted with the inner diameter of the oil seal and the inner diameter of the upper bearing, ensuring that salt spray will not enter during fan blade operation, protecting the upper bearing. The top of the inner ring of the upper surface of the upper bearing seals against the lower surface of the shaft core step, and the size of the shaft core step is slightly larger than the inner ring size of the bearing, ensuring that the fan blades will not move axially. A rubber plug is placed at the third step of the central tube, and the rubber plug is interference-fitted with the third step of the central tube, ensuring that salt spray will not enter from this point, protecting the lower bearing. This cooling fan provides a new type of high-protection fan in the field, solving the problems of poor fan stability and insufficient protection performance of existing similar products in extreme and harsh environments.

Claims

1. A novel high-protection cooling fan, comprising a frame (1), fan blades (2) and a motor assembly (6), wherein the inner wall of the hub (201) of the fan blades is provided with a magnet, the PCB board (601) of the motor assembly is integrated with the winding assembly (602) and set in the middle tube (101) of the frame, and the motor assembly is fixed to the outer diameter of the middle tube by dispensing glue, the frame and the motor assembly are placed together in a fixture and glued together by potting material (10), the motor assembly is provided with a wire (603) extending out of the potting material; the shaft core (2021) at the central shaft inside the hub is inserted and fixed to the middle tube of the frame, the outer diameters of the two ends of the shaft core inside the middle tube are respectively provided with a lower bearing (4) and an upper bearing (5), the shaft core is fixed in the middle tube by a spring (3), a plastic gasket (7) arranged sequentially at the end, and a buckle (8) at the end of the slot (20211), the magnet on the inner wall of the hub and the coil wound on the plastic bracket of the winding assembly are set with a relative gap; characterized in that The inner diameter of the middle tube (101) of the frame (1) is provided with a first step (1011), a second step (1012), and a third step (1013) in sequence from the upper bearing (5) to the lower bearing (4). The first step is connected to the second step and is set at one end of the inner diameter of the middle tube with a reduced inner diameter. A transition inner diameter is provided between the second step and the third step. The third step is set at the other end of the inner diameter of the middle tube. The second and third steps of the inner diameter of the middle tube are respectively provided with an upper bearing and a lower bearing with the outer diameter of the shaft core (2021). An oil seal (9) is provided at the first step of the inner diameter of the middle tube. The outer diameter and inner diameter of the oil seal are respectively sealed against the outer diameter of the shaft core and the inner diameter of the middle tube. The ring surface of one end of the oil seal is sealed against the top ring surface of the upper bearing. That is, the outer diameter of the oil seal is interference-fitted with the first step of the middle tube. The lower surface of the oil seal is sealed against the upper surface of the upper bearing.

2. The novel high-protection cooling fan according to claim 1, characterized in that... The upper bearing (5) has a reduced diameter shaft core step (20212) on the outer diameter of the shaft core (2021) at the upper surface. The top seal of the inner ring of the upper bearing abuts against the lower surface of the shaft core step. At the same time, the inner diameter of the oil seal and the inner diameter of the upper bearing are respectively interference-fitted with the circumferential surface and the lower circumferential surface of the shaft core at the shaft core step.

3. The novel high-protection cooling fan according to claim 1, characterized in that... The oil seal (9) is a polytetrafluoroethylene oil seal. The top of the oil seal is provided with an annular groove. The outer and inner diameter edges of the annular groove are respectively raised outward and higher than the outer circumference. The outer edge of the oil seal is higher than the inner edge of the oil seal.

4. The novel high-protection cooling fan according to claim 1, characterized in that... A rubber plug (11) is provided on the inner diameter of one side port of the third step (1013) of the middle tube (101).

5. The novel high-protection cooling fan according to claim 1, characterized in that... The inner diameters of the first step (1011) and the third step (1013) inside the middle tube (101) of the frame (1) are set to be the same.

6. The novel high-protection cooling fan according to claim 1, characterized in that... The shaft core (2021) at the center of the hub (201) of the fan blade (2) is fixedly installed at the center of the motor housing assembly (202) through the bushing (2022). At the same time, the motor housing assembly and the connection between the motor assembly and the bushing are fixedly installed in the hub by integral injection molding.

Images