Waterproof heat dissipation fan

Abstract

The utility model provides a waterproof heat dissipation fan relates to fan technical field, it includes fan impeller and motor, and the motor includes the casing and coaxial rotation setting output shaft in the casing, is provided with the shaft hole on the casing, and the output shaft passes through the shaft hole and is fixedly connected with fan impeller, the inner wall of casing is provided with the mounting portion, and the mounting portion surrounds the outside of shaft hole, and the mounting portion includes first installation groove and second installation groove, and is fixedly provided with bearing in first installation groove, and the bearing is sleeved on the output shaft, and second installation groove is located between first installation groove and shaft hole, and is fixedly provided with skeleton water seal in second installation groove, and the skeleton water seal is sleeved on the output shaft. Through the setting of skeleton water seal, can improve the sealed contact area and the shaft surface pressure of output shaft and form more reliable dynamic sealing interface, avoid the direct influence of sealing element wear to bearing accuracy at the same time, improve the waterproof reliability of motor output shaft portion greatly.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan technical field especially relates to a waterproof heat dissipation fan. BACKGROUND

[0002] In the existing heat dissipation fan design, the waterproof seal of the motor output shaft and the shell connection place mainly depends on the sealing structure of bearing self, such as rubber sealing ring (RS type) or metal dust cover (ZZ type). However, this kind of design that completely entrusts the sealing function to the sealing ring of bearing self has obvious defects: on the one hand, the rubber material of bearing seal is easy to age and crack under long-term friction operation, leading to the gradual deterioration of sealing performance; on the other hand, since the output shaft needs to rotate at high speed, a certain dynamic gap must be reserved between the sealing lip and the shaft surface, which makes water vapor or even liquid water able to penetrate into the motor interior through the tiny gap. Especially in the high temperature and high humidity or the use environment that needs to be washed regularly, the waterproof performance of this kind of sealing structure is more difficult to guarantee, finally leading to the faults such as motor winding damp, bearing lubrication failure, which seriously affects the service life and reliability of the fan. SUMMARY

[0003] Therefore, the utility model provides a waterproof heat dissipation fan to solve the problem of water vapor intrusion into the motor interior caused by the insufficient waterproof performance of the sealing ring of bearing self in the prior art.

[0004] The technical scheme of the utility model is realized as follows:

[0005] The utility model provides a waterproof heat dissipation fan, it includes fan impeller and motor, the motor includes the shell and the output shaft coaxial rotation setting in the shell,

[0006] The shell is provided with the shaft hole, and the output shaft passes through the shaft hole and is fixedly connected with the fan impeller,

[0007] The inner wall of the shell is provided with a mounting portion, the mounting portion surrounds the outside of the shaft hole, the mounting portion includes a first mounting groove and a second mounting groove, a bearing is fixedly arranged in the first mounting groove, the bearing is sleeved on the output shaft, the second mounting groove is located between the first mounting groove and the shaft hole, a skeleton water seal is fixedly arranged in the second mounting groove, and the skeleton water seal is sleeved on the output shaft.

[0008] On the basis of the above technical scheme, preferably, the outer diameter of the second mounting groove is smaller than the outer diameter of the first mounting groove, forming a stepped mounting structure, the inner wall of the second mounting groove has a clamping groove, and the outer side of the skeleton water seal has a clamping protrusion matched with the clamping groove.

[0009] On the basis of the above technical scheme, preferably, the skeleton water seal comprises:

[0010] A metal shell is fixed in the second mounting groove by interference fit;

[0011] A rubber sealing lip is integrally connected with the inner edge of the metal shell by vulcanization forming, and the lip of the rubber sealing lip is inwardly inclined and forms dynamic sealing contact with the surface of the output shaft.

[0012] A coil spring is embedded in the annular groove on the inner side of the rubber sealing lip, and is used to provide radial compression force to the lip.

[0013] On the basis of the above technical scheme, preferably, the rubber sealing lip is provided with an axially extending recess cavity on the side facing the bearing, and the recess cavity and the bearing form a lubricating grease storage space.

[0014] On the basis of the above technical scheme, preferably, the fan impeller comprises a wheel cover, a wheel rim and blades, the wheel rim is coaxially sleeved on the outer side of the wheel cover, the blades are arranged in plurality and uniformly arranged on the outer circumferential side of the wheel cover and fixedly connected with the wheel rim, the wheel cover is coaxially sleeved on the outer side of the shell, and the sealing structure is arranged between the top surface of the shell and the inner top surface of the wheel cover.

[0015] On the basis of the above technical scheme, preferably, the sealing structure comprises an annular flange and an annular boss, the annular boss is fixedly arranged on the inner top surface of the wheel cover in a coaxial manner, the upper end side wall of the annular flange is wrapped around the outer side wall of the annular boss, and the lower end is fixedly connected with the top surface of the shell.

[0016] On the basis of the above technical scheme, preferably, the outer side of the annular boss is fixedly provided with a sealing ring in contact with the inner wall of the annular flange.

[0017] On the basis of the above technical scheme, preferably, a plurality of ventilation holes are formed in the wheel cover.

[0018] On the basis of the above technical scheme, preferably, the motor further comprises an end cover, a stator and a rotor, the shell is open at the end away from the fan impeller, the end cover is sealingly and fixedly connected with the open end of the shell, the output shaft is rotatably connected with the end cover at the end away from the fan impeller, the stator is fixedly arranged on the inner side wall of the shell, the rotor is fixedly arranged on the output shaft, the rotor is provided with a receiving groove facing the inner top surface of the shell, and the mounting part is accommodated in the receiving groove.

[0019] On the basis of the above technical scheme, preferably, the fan base is fixedly arranged on the end of the motor away from the fan impeller.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] (1) The structural design of setting an independent skeleton water seal above the bearing has significant technical advantages over the traditional bearing self-sealing scheme: the traditional bearing seal is limited by the internal space of the bearing, the size of the seal and the sealing pressure are small, and the rubber sealing lip is prone to aging and cracking due to long-term friction with the shaft surface; while the independent skeleton water seal of this embodiment can be designed with a larger sealing contact area and a stronger shaft surface clamping force, forming a more reliable dynamic sealing interface, while avoiding the direct impact of seal wear on bearing accuracy, greatly improving the waterproof reliability of the motor output shaft.

[0022] (2) By setting an axial cavity on the rubber sealing lip, a dynamic grease storage space is created, achieving dual optimization of sealing and lubrication. This structure not only improves the lubrication durability of the bearing, but also enhances the waterproof and dustproof effect through the barrier effect of the grease.

[0023] (3) The sealing structure and the skeleton water seal together constitute the dual sealing mechanism of the waterproof cooling fan. The function of the sealing structure is to block water vapor / liquid from penetrating into the gap of the output shaft, which serves as the first line of defense against water damage. The function of the skeleton water seal is to prevent residual water vapor / liquid that has broken through the first line of defense from entering the motor through the axial gap of the motor output shaft. If the sealing structure fails temporarily due to assembly errors or vibration, the skeleton water seal can still independently provide basic waterproofing; conversely, if the water seal ages, the sealing structure can slow down the rate of water vapor intrusion.

[0024] (4) By setting a receiving groove on the rotor to accommodate the mounting part, the bearing and the skeleton water seal can occupy the internal space of the rotor without occupying a large space in the axial direction inside the housing, thus improving the structural compactness of the motor. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is an exploded view of the waterproof cooling fan disclosed in this utility model;

[0027] Figure 2 This is a top view of the waterproof cooling fan disclosed in this utility model;

[0028] Figure 3 for Figure 2 Planar sectional view at point AA;

[0029] Figure 4 for Figure 3Enlarged view of a section at point B in the middle;

[0030] Figure label:

[0031] 1. Fan impeller; 11. Impeller cover; 12. Impeller rim; 13. Blade; 110. Ventilation hole; 2. Motor; 21. Housing; 22. Output shaft; 211. Shaft hole; 23. Mounting part; 231. First mounting groove; 232. Second mounting groove; 24. Bearing; 25. Frame water seal; 251. Metal outer shell; 252. Rubber sealing lip; 253. Helical spring; 2521. Cavity; 26. End cover; 27. Stator; 28. Rotor; 281. Receiving groove; 3. Sealing structure; 31. Annular flange; 32. Annular boss; 33. Sealing ring; 4. Fan base. Detailed Implementation

[0032] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0033] like Figure 1 As shown, combined with Figures 2-4 This utility model discloses a waterproof cooling fan, which includes a fan impeller 1 and a motor 2, the motor 2 being used to drive the fan impeller 1 to rotate.

[0034] In this embodiment, the motor 2 includes a housing 21 and an output shaft 22 coaxially rotatably disposed within the housing 21.

[0035] The housing 21 serves as the main support structure for the motor 2. The housing 21 is provided with a shaft hole 211. Specifically, the shaft hole 211 is located on the top surface of the housing 21 and is coaxially arranged with the housing 21. The output shaft 22 passes through the shaft hole 211 and is fixedly connected to the fan impeller 1.

[0036] Since the output shaft 22 and the shaft hole 211 are in a rotating connection relationship, there is a certain clearance between them. It is necessary to consider the sealing at the output shaft 22 and the shaft hole 211 to prevent external moisture from entering the motor 2.

[0037] In this embodiment, the inner wall of the housing 21 is provided with a mounting part 23. The mounting part 23 is coaxially surrounding the outside of the shaft hole 211. The mounting part 23 includes a first mounting groove 231 and a second mounting groove 232. A bearing 24 is fixedly installed in the first mounting groove 231 and is sleeved on the output shaft 22. The second mounting groove 232 is located between the first mounting groove 231 and the shaft hole 211. A skeleton water seal 25 is fixedly installed in the second mounting groove 232 and is sleeved on the output shaft 22.

[0038] In this embodiment, the bearing 24 is disposed within the first mounting groove 231 and sleeved on the output shaft 22, serving the dual functions of supporting rotational motion and reducing frictional loss. The skeleton water seal 25 is disposed within the second mounting groove 232 and located outside the bearing 24 (near the shaft hole 211 end). This arrangement forms a dual protection mechanism against moisture intrusion. When external moisture attempts to penetrate axially, it must first overcome the barrier of the water seal before contacting the bearing 24, greatly reducing the risk of moisture directly corroding the bearing 24.

[0039] This utility model has significant technical advantages over the traditional bearing 24 self-sealing solution by independently setting a skeleton water seal 25 above the bearing 24. The traditional bearing 24 seal is limited by the internal space of the bearing 24, the size of the seal and the sealing pressure are small, and the rubber sealing lip is prone to aging and cracking due to long-term friction with the shaft surface. However, the independent skeleton water seal 25 of this embodiment can be designed with a larger sealing contact area and a stronger shaft surface clamping force to form a more reliable dynamic sealing interface. At the same time, it avoids the direct impact of seal wear on the accuracy of the bearing 24, and greatly improves the waterproof reliability of the motor output shaft 22.

[0040] In some implementations, the outer diameter of the second mounting groove 232 is smaller than the outer diameter of the first mounting groove 231, forming a stepped mounting structure. This configuration allows the bearing 24 and the skeleton water seal 25 to be installed in layers. Because the inner diameter of the second mounting groove 232 is smaller, its side near the shaft hole 211 forms an axial limit, ensuring that the skeleton water seal 25 does not shift towards the bearing 24 after installation, thus maintaining a stable sealing position. This stepped design optimizes the installation space, making the axial positioning of the bearing 24 and the water seal more precise and avoiding assembly errors affecting the sealing effect.

[0041] The inner wall of the second mounting groove 232 has a slot (not shown in the figure), and the outer side of the skeleton water seal 25 has a snap-fit ​​protrusion (not shown in the figure) that mates with the slot. The snap-fit ​​protrusion of the skeleton water seal 25 and the slot of the second mounting groove 232 form an interlocking structure to ensure that the water seal remains stable in both the axial and radial directions. This design not only simplifies the assembly process (it can be fixed by simply pressing), but also prevents the water seal from shifting due to material fatigue or thermal expansion and contraction during long-term use, thus improving the durability of the seal.

[0042] As some implementations, the skeleton water seal 25 includes a metal housing 251, a rubber sealing lip 252, and a helical spring 253.

[0043] The metal housing 251 is interference-fitted and fixed within the second mounting groove 232, ensuring no relative displacement between the water seal and the housing 21. This design enhances the rigidity of the overall structure, preventing the water seal from loosening due to vibration or rotation. Simultaneously, the rigid support of the metal housing 251 prevents the rubber sealing lip 252 from deforming due to uneven stress, thus improving sealing stability.

[0044] The rubber sealing lip 252 is bonded to the inner edge of the metal housing 251 using a vulcanization molding process, forming a seamless connection and avoiding the risk of delamination that may occur with traditional adhesive methods. The lip of the rubber sealing lip 252 is inclined inward, forming a dynamic sealing contact with the surface of the output shaft 22, which can accommodate the slight radial runout of the shaft and effectively prevent water vapor or liquid penetration.

[0045] A helical spring 253 is embedded in an annular groove inside the rubber sealing lip 252, continuously applying radial pressure to the lip to compensate for the elasticity loss of the rubber material due to long-term use. This design ensures that the sealing lip always fits tightly against the surface of the output shaft 22, maintaining stable sealing pressure even during high-speed rotation or temperature changes, significantly improving waterproof reliability.

[0046] In some implementations, the rubber sealing lip 252 has an axially extending cavity 2521 on the side facing the bearing 24, forming a grease storage space between the cavity 2521 and the bearing 24. This structural design provides a stable storage space for grease without affecting the contact surface between the sealing lip and the output shaft 22. The stored grease can be slowly released to the contact surface of the bearing 24, extending the service life of the bearing 24. The grease layer forms an additional barrier between the sealing lip and the bearing 24, further preventing external moisture or contaminants from entering the bearing 24.

[0047] By creating an axial cavity 2521 on the rubber sealing lip 252, a dynamic grease storage space is created, achieving dual optimization of sealing and lubrication. This structure not only improves the lubrication durability of the bearing 24 but also enhances the waterproof and dustproof effect through the barrier effect of the grease.

[0048] In some implementations, the fan impeller 1 includes a shroud 11, a ring 12, and blades 13. The ring 12 is coaxially fitted onto the outside of the shroud 11. Multiple blades 13 are evenly distributed on the outer periphery of the shroud 11 and fixedly connected to the ring 12. The shroud 11 is coaxially fitted onto the outside of the housing 21, forming a protective enclosure for the motor 2 housing 21. The multiple blades 13, evenly distributed on the outer periphery of the shroud 11 and fixedly connected to the ring 12, ensure efficient airflow delivery while enhancing the overall structural strength of the impeller through the ring 12. This layout optimizes aerodynamic efficiency and reduces the risk of external moisture directly contacting the housing 21 by utilizing the covering effect of the shroud 11.

[0049] A sealing structure 3 is provided between the top surface of the housing 21 and the inner top surface of the wheel cover 11, which can block the vertical permeation path of external liquid along the gap between the wheel cover 11 and the housing 21.

[0050] This embodiment illustrates one structural form of the sealing structure 3. Specifically, the sealing structure 3 includes an annular flange 31 and an annular boss 32. The annular boss 32 is coaxially fixedly disposed on the inner top surface of the wheel cover 11. The upper sidewall of the annular flange 31 surrounds and covers the outer sidewall of the annular boss 32, and the lower end is fixedly connected to the top surface of the housing 21. This configuration creates a labyrinthine sealing interface between the annular flange 31 and the annular boss 32. The flange-covering-boob design forces water vapor or liquid to meander through the tortuous gaps, significantly increasing the permeation resistance.

[0051] In this embodiment, a sealing ring 33 is fixedly provided on the outer side of the annular boss 32, which contacts the inner wall of the annular flange 31, which can greatly reduce the possibility of water vapor / liquid penetrating into the gap of the output shaft 22.

[0052] In this embodiment, the sealing structure 3 and the skeleton water seal 25 together constitute a dual sealing mechanism for the waterproof cooling fan. The function of the sealing structure 3 is to block the penetration of water vapor / liquid into the gap of the output shaft 22, serving as the first line of defense against water damage. The function of the skeleton water seal 25 is to prevent residual water vapor / liquid that has breached the first line of defense from entering the motor 2 along the axial gap of the motor output shaft 22. If the sealing structure 3 temporarily fails due to assembly errors or vibration, the skeleton water seal 25 can still independently provide basic waterproofing; conversely, if the water seal ages, the sealing structure 3 can slow down the rate of water vapor intrusion.

[0053] As one implementation, the wheel cover 11 is provided with a number of ventilation holes 110, which facilitate the rapid discharge of heat generated by the motor 2 during operation through air convection.

[0054] In some embodiments, the motor 2 also includes an end cover 26, a stator 27, and a rotor 28. The housing 21 has an opening at one end away from the fan impeller 1, and the end cover 26 is sealed and fixedly connected to the opening end of the housing 21. The opening end of the housing 21 is closed by the end cover 26, forming a sealed cavity inside the motor 2, blocking the intrusion path of external moisture from the non-output shaft 22 end.

[0055] The end of the output shaft 22 away from the fan impeller 1 is rotatably connected to the end cover 26. The stator 27 is fixedly installed on the inner side wall of the housing 21, and the rotor 28 is fixedly installed on the output shaft 22. The rotor 28 has a receiving groove 281 facing the inner top surface of the housing 21. The mounting part 23 is accommodated in the receiving groove 281. In this embodiment, the depth of the receiving groove 281 is greater than the height of the mounting part 23, so that the bearing 24 and the skeleton water seal 25 can occupy the internal space of the rotor 28 without occupying a large space in the axial direction inside the housing 21, thereby improving the structural compactness of the motor 2.

[0056] As one implementation method, the cooling fan in this embodiment also includes a fan base 4, which is fixedly disposed at the end of the motor 2 away from the fan impeller 1. The fan base 4 facilitates the installation of the entire cooling fan onto the equipment that needs cooling.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waterproof cooling fan, comprising a fan impeller (1) and a motor (2), characterized in that, The motor (2) includes a housing (21) and an output shaft (22) coaxially rotatably disposed within the housing (21); The housing (21) is provided with a shaft hole (211), and the output shaft (22) passes through the shaft hole (211) and is fixedly connected to the fan impeller (1); The inner wall of the housing (21) is provided with a mounting part (23), which surrounds the outside of the shaft hole (211). The mounting part (23) includes a first mounting groove (231) and a second mounting groove (232). A bearing (24) is fixedly installed in the first mounting groove (231) and is sleeved on the output shaft (22). The second mounting groove (232) is located between the first mounting groove (231) and the shaft hole (211). A skeleton water seal (25) is fixedly installed in the second mounting groove (232) and is sleeved on the output shaft (22).

2. The waterproof cooling fan as described in claim 1, characterized in that: The outer diameter of the second mounting groove (232) is smaller than that of the first mounting groove (231), forming a stepped mounting structure. The inner wall of the second mounting groove (232) has a slot, and the outer side of the skeleton water seal (25) has a snap-fit ​​protrusion that cooperates with the slot.

3. The waterproof cooling fan as described in claim 2, characterized in that: The skeleton water seal (25) includes: The metal casing (251) is interference-fitted and fixed in the second mounting groove (232); The rubber sealing lip (252) is integrally connected to the inner edge of the metal shell (251) by vulcanization molding. The lip of the rubber sealing lip (252) is inclined inward and forms a dynamic sealing contact with the surface of the output shaft (22). A helical spring (253) is embedded in an annular groove inside the rubber sealing lip (252) to provide radial clamping force to the lip.

4. The waterproof cooling fan as described in claim 3, characterized in that: The rubber sealing lip (252) has an axially extending cavity (2521) on the side facing the bearing (24), and a grease storage space is formed between the cavity (2521) and the bearing (24).

5. The waterproof cooling fan as described in claim 1, characterized in that: The fan impeller (1) includes a wheel cover (11), a wheel ring (12), and blades (13). The wheel ring (12) is coaxially sleeved on the outside of the wheel cover (11). Multiple blades (13) are provided and evenly arranged on the outer periphery of the wheel cover (11) and fixedly connected to the wheel ring (12). The wheel cover (11) is coaxially sleeved on the outside of the housing (21). There is a sealing structure (3) between the top surface of the housing (21) and the inner top surface of the wheel cover (11).

6. The waterproof cooling fan as described in claim 5, characterized in that: The sealing structure (3) includes an annular flange (31) and an annular boss (32). The annular boss (32) is coaxially fixedly disposed on the inner top surface of the wheel cover (11). The upper side wall of the annular flange (31) surrounds and covers the outer side wall of the annular boss (32), and the lower end is fixedly connected to the top surface of the housing (21).

7. The waterproof cooling fan as described in claim 6, characterized in that: A sealing ring (33) is fixedly provided on the outer side of the annular boss (32) and contacts the inner wall of the annular flange (31).

8. The waterproof cooling fan as described in claim 5, characterized in that: The wheel cover (11) has several ventilation holes (110).

9. The waterproof cooling fan as described in claim 1, characterized in that: The motor (2) also includes an end cover (26), a stator (27) and a rotor (28). The housing (21) is open at one end away from the fan impeller (1), and the end cover (26) is sealed and fixedly connected to the open end of the housing (21). The output shaft (22) is rotatably connected to the end cover (26) at one end away from the fan impeller (1). The stator (27) is fixedly installed on the inner side wall of the housing (21). The rotor (28) is fixedly installed on the output shaft (22). The rotor (28) has a receiving groove (281) facing the inner top surface of the housing (21). The mounting part (23) is accommodated in the receiving groove (281).

10. The waterproof cooling fan as described in claim 1, characterized in that: It also includes a fan base (4), which is fixedly disposed at the end of the motor (2) away from the fan impeller (1).

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