Contact type sealing structure and cooling fan

Abstract

The utility model provides a contact type sealing structure and a cooling fan, the cooling fan comprises a fan outer frame, a motor support used for fixedly arranging a motor assembly is fixedly arranged in an air channel of the fan outer frame, a bearing sleeve is fixedly arranged on the motor support, and the inner wall of the bearing sleeve is rotatably connected with a rotating shaft through a bearing; the connecting end of the rotating shaft is fixedly connected with the impeller. A stator assembly is fixedly arranged on the outer wall of the bearing sleeve and corresponds to a rotor assembly on the impeller. A sealing structure is arranged on the inner wall of the air channel of the fan outer frame, the impeller can make rotating contact with the sealing structure, and dynamic sealing of the fan is achieved. According to the cooling fan, the dynamic sealing structure is arranged on the inner wall of the air channel of the fan outer frame, the sealing effect between the impeller and the fan shell is achieved, the air pressure in the shell is improved, and the air supply efficiency is further improved. And the sealing ring or the sealing piece of the brush structure can be in contact with the blade tip when the impeller rotates, so that the dynamic sealing effect is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling fans, in particular to a contact sealing structure and a cooling fan. Background Technique

[0002] Cooling fans are widely used in production and life. They can quickly provide the required wind power to exhaust heat from other facilities such as electrical appliances. To achieve rapid air supply and heat dissipation, it is necessary to increase the fan speed or improve the dynamic sealing effect. However, most of the current cooling fans on the market do not have a dynamic sealing structure or the dynamic sealing structure is unreasonable, which will lead to pressure relief, reducing the air supply efficiency. When the ideal air supply effect is achieved, a higher speed needs to be realized. However, when the air is supplied at a high speed, the vibration and noise of the fan will increase, and the operating noise will also affect the environmental quality of people's production and life. Moreover, the blades will have large deformations, reducing the service life of the blades. The vibration of the fan operation is harmful to the equipment. Long-term exposure to a vibrating environment will cause parts to loosen and even accelerate the wear of parts. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a contact sealing structure and a cooling fan to solve the problems of poor dynamic sealing effect, low air pressure, low air supply efficiency and large vibration of the cooling fan in the prior art.

[0004] The utility model provides a contact sealing structure. The sealing structure is a sealing ring, which is fixedly arranged on the inner wall of the air duct of the fan outer frame, corresponding to the tip position of the impeller of the fan, and the maximum diameter of the impeller is slightly larger than the inner diameter of the sealing ring.

[0005] Further, an annular fixing groove is provided on the inner wall of the air duct of the fan outer frame, and the sealing ring is fixed in the annular fixing groove.

[0006] The utility model provides a contact sealing structure. The sealing structure is a plurality of sealing pieces evenly arranged on the inner wall of the air duct of the fan outer frame. The sealing pieces correspond to the tip position of the impeller of the fan, and the maximum diameter of the impeller is slightly larger than the inner diameter of the circle formed by the plurality of sealing pieces.

[0007] Further, a plurality of installation grooves are provided on the inner wall of the air duct of the fan outer frame corresponding to the plurality of sealing pieces, and the sealing pieces are fixed in the installation grooves.

[0008] Further, the surface of the sealing piece has a fixing groove, and a blind hole matching the fixing groove is provided in the installation groove. The sealing piece is fixedly connected to the blind hole through a fixing member by fixing the fixing groove and the blind hole together.

[0009] Further, one side of the sealing ring close to the impeller is a brush surface, and the blade tip of the impeller can contact the brush.

[0010] Further, the diameter of the brush surface of the sealing ring is slightly smaller than the diameter of the inner wall of the air duct of the fan outer frame.

[0011] The utility model provides a heat dissipation fan with a contact sealing structure. The heat dissipation fan includes: a fan outer frame, a motor bracket for fixedly arranging a motor assembly is fixedly arranged in the air duct of the fan outer frame, a bearing sleeve is fixedly arranged on the motor bracket, the inner wall of the bearing sleeve is rotationally connected with a rotating shaft through a bearing, and the connecting end of the rotating shaft is fixedly connected with an impeller; a stator assembly is fixedly arranged on the outer wall of the bearing sleeve, and the stator assembly is correspondingly arranged with a rotor assembly on the impeller; a sealing structure is arranged on the inner wall of the air duct of the fan outer frame, and the impeller can rotate and contact with the sealing structure to realize the dynamic sealing of the fan.

[0012] Further, the impeller includes a hub and blades. Among them, the hub is fixedly connected with the connecting end of the rotating shaft through a fixing nut; a plurality of the blades are evenly distributed on the circumference of the hub and fixedly connected; the blades and the hub are of an integral structure.

[0013] Further, a plurality of counterweight grooves are evenly distributed along the circumference at the top of the hub.

[0014] According to the above embodiments, the contact sealing structure and the heat dissipation fan provided by the utility model have at least the following advantages: the heat dissipation fan realizes the sealing effect between the impeller and the fan housing by arranging a dynamic sealing structure on the inner wall of the air duct of the fan outer frame, improves the air pressure inside the housing, and further improves the air supply efficiency. Moreover, the sealing ring or sealing piece with a brush structure can contact the blade tip when the impeller rotates, further improving the dynamic sealing effect.

[0015] It should be understood that the above general description and the following specific embodiments are only exemplary and explanatory, and cannot limit the scope claimed by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following drawings are part of the specification of the present invention, which illustrate the exemplary embodiments of the present invention. The accompanying drawings and the description of the specification are used together to explain the principle of the present invention.

[0017] Figure 1 It is a cross-sectional view of Embodiment 1 of the heat dissipation fan with a contact sealing structure provided by the present invention.

[0018] Figure 2 It is a top cross-sectional view of Embodiment 1 of the heat dissipation fan with a contact sealing structure provided by the present invention.

[0019] Figure 3 Stereoscopic structure diagram of Embodiment 1 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0020] Figure 4 Embodiment 2 of the heat dissipation fan with a contact sealing structure provided by the present utility model

[0021] Figure 5 Top view sectional view of Embodiment 3 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0022] Figure 6 Sectional view of Embodiment 3 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0023] Figure 7 Top view sectional view of Embodiment 4 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0024] Figure 8 Sectional view of Embodiment 4 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0025] Figure 9 Top view sectional view of Embodiment 5 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0026] Figure 10 Sectional view of Embodiment 6 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0027] Figure 11 Sectional view of Embodiment 7 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0028] Figure 12 Sectional view of Embodiment 8 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0029] Figure 13 Sectional view of Embodiment 9 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0030] Figure 14 Sectional view of Embodiment 10 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0031] Figure 15 Top view sectional view of Embodiment 10 of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0032] Figure 16Cross-sectional view of the eleventh embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0033] Figure 17 Top cross-sectional view of the twelfth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0034] Figure 18 Top cross-sectional view of the thirteenth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0035] Figure 19 Top cross-sectional view of the fourteenth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model.

[0036] Description of reference numerals:

[0037] 1 - Fan outer frame, 2 - Motor bracket, 3 - Bearing sleeve, 4 - Bearing, 5 - Rotating shaft, 6 - Impeller, 7 - Stator assembly, 8 - Rotor assembly, 9 - Sealing ring, 10 - Sealing piece;

[0038] 61 - Hub, 62 - Blade, 63 - Fixing nut. Detailed implementation manners

[0039] The various exemplary implementation manners of the present utility model will now be described in detail. This detailed description should not be considered as a limitation of the present utility model, but rather as a more detailed description of certain aspects, characteristics, and implementation schemes of the present utility model.

[0040] Without departing from the scope or spirit of the present utility model, various improvements and changes can be made to the specific implementation manners of the specification of the present utility model, which are obvious to those skilled in the art. Other implementation manners obtained from the specification of the present utility model are obvious to those skilled in the art. The specification and embodiments of this application are merely exemplary.

[0041] The present utility model provides a contact sealing structure. In one implementation manner, as Figure 1-3 shown, the sealing structure is a sealing ring 9. The sealing ring 9 is fixedly arranged on the inner wall of the air duct of the fan outer frame 1, corresponding to the tip position of the impeller 6 of the fan, and the maximum diameter of the impeller 6 is slightly larger than the inner diameter of the sealing ring 9. Specifically, the sealing ring 9 and the inner wall of the air duct of the fan outer frame 1 are in interference fit to improve the stability of their connection and prevent detachment during use.

[0042] Furthermore, the surface of the sealing ring 9 close to the impeller 6 is a brush surface, and the tip of the impeller 6 can contact the brush.

[0043] Further, the diameter of the brush surface of the sealing ring 9 is slightly smaller than the diameter of the inner wall of the air duct of the fan outer frame 1. That is, the brushes on the brush surface of the sealing ring 9 extend radially and can contact the impeller. When the tip of the impeller 6 contacts the brush surface, it is prevented from contacting the inner wall of the air duct of the fan outer frame 1.

[0044] In addition, when the impeller 6 rotates, the bristles will tilt along the rotation direction due to the drive of the impeller 6, thereby reducing the frictional force to almost negligible, which will not have an obvious impact on the rotation of the impeller 6, but will significantly improve the sealing effect, resulting in a great increase in the air pressure of the cooling fan.

[0045] In one embodiment of the present invention, the tip of the impeller 6 does not contact the sealing ring 9. When the impeller 6 rotates, due to the deformation of the blades and their extension in the radial direction, the tip position of the impeller 6 will contact the sealing ring 9 at this time, achieving a contact-type dynamic sealing effect, which can make the dynamic sealing effect more tight, greatly reducing the possibility of pressure relief, increasing the air pressure inside the air duct, and thus greatly improving the air supply efficiency.

[0046] As Figure 4 shown, in one embodiment of the present invention, the difference between this embodiment and the Figure 1 embodiment shown is that the inner wall of the air duct of the fan outer frame 1 has an annular fixing groove, and the sealing ring 9 is fixed in the annular fixing groove.

[0047] As Figure 5 and Figure 6 shown, in one embodiment of the present invention, the difference between this embodiment and the Figure 1 embodiment shown is that the sealing structure is a plurality of sealing pieces 10 uniformly arranged on the inner wall of the air duct of the fan outer frame 1. The sealing pieces 10 correspond to the tip positions of the impeller 6 of the fan, and the maximum diameter of the impeller 6 is slightly larger than the inner diameter of the circle formed by the plurality of sealing pieces 10.

[0048] Further, a plurality of installation grooves are provided on the inner wall of the air duct of the fan outer frame 1 corresponding to the plurality of sealing pieces 10, and the sealing pieces 10 are fixed in the installation grooves.

[0049] As Figure 7 and Figure 8 shown, in one embodiment of the present invention, the difference between this embodiment and the Figure 6 embodiment shown is that the surface of the sealing piece 10 has a fixing groove, and the installation groove has a blind hole matching the fixing groove. The sealing piece 10 is fixedly connected to the blind hole through a fixing member by fixing the fixing groove and the blind hole. In this embodiment, each sealing piece 10 is fixed by one fixing member, and the fixing member can be a bolt or a screw.

[0050] As Figure 9As shown, in one embodiment of the present utility model, the difference between this embodiment and Figure 7 the embodiment shown is that in this embodiment, each sealing piece 10 is fixed by two fixing members, and the fixing members can be bolts or screws.

[0051] As Figure 10 shown, in one embodiment of the present utility model, the difference between this embodiment and Figure 1 the embodiment shown is that generally, when the impeller 6 rotates, the deformation amount of the tip of the front part of the blade tip is greater than that of the tail of the rear part of the blade tip. Therefore, the tip contacts the sealing ring 9 more, which will further cause greater friction between the tip and the sealing ring. Therefore, shortening the height of the sealing ring 9 can avoid the contact between the tip and the sealing ring, while the tail can still maintain a slight contact with the sealing ring 9, ensuring the dynamic sealing effect.

[0052] In this embodiment, due to the position setting, the tip height of the impeller 6 is higher than the tail height. Therefore, the height of the sealing ring 9 is reduced to Figure 1 half of the embodiment shown, which can avoid contact with the tip and maintain contact with the tail.

[0053] As Figure 11 shown, in one embodiment of the present utility model, the difference between this embodiment and Figure 1 the embodiment shown is that in this embodiment, due to the position setting, the tip height of the impeller 6 is higher than the tail height. Therefore, the height of the sealing ring 9 is reduced to Figure 1 one-third of the embodiment shown, which can avoid contact with the tip and maintain contact with the tail.

[0054] As Figure 12 shown, in one embodiment of the present utility model, the difference between this embodiment and Figure 6 the embodiment shown is that in this embodiment, due to the position setting, the tip height of the impeller 6 is higher than the tail height. Therefore, the height of the sealing piece 10 is reduced to Figure 6 half of the embodiment shown, which can avoid contact with the tip and maintain contact with the tail.

[0055] As Figure 13 shown, in one embodiment of the present utility model, the difference between this embodiment and Figure 6 the embodiment shown is that in this embodiment, due to the position setting, the tip height of the impeller 6 is higher than the tail height. Therefore, the height of the sealing piece 10 is reduced to Figure 6 one-third of the embodiment shown, which can avoid contact with the tip and maintain contact with the tail.

[0056] The present utility model also provides a heat dissipation fan with a contact sealing structure, such as Figure 1-3The following is a schematic structural diagram of the cooling fan. In a specific embodiment, the cooling fan includes: a fan outer frame 1, a motor bracket 2 for fixedly arranging a motor assembly is fixedly arranged in the air duct of the fan outer frame 1, a bearing sleeve 3 is fixedly arranged on the motor bracket 2, and the bearing sleeve 3 is located at the axis of the air duct of the fan outer frame 1. The inner wall of the bearing sleeve 3 is rotatably connected to a rotating shaft 5 through a bearing 4, and the connecting end of the rotating shaft 5 is fixedly connected to an impeller 6.

[0057] A stator assembly 7 is fixedly arranged on the outer wall of the bearing sleeve 3, and the stator assembly 7 is correspondingly arranged with a rotor assembly 8 on the impeller 6, thereby driving the impeller to rotate.

[0058] In addition, a sealing structure is arranged on the inner wall of the air duct of the fan outer frame 1, and the impeller 6 can be in rotational contact with the sealing structure to realize dynamic sealing of the fan.

[0059] Furthermore, the impeller 6 includes a hub 61 and blades 62. Among them, the hub 61 is fixedly connected to the connecting end of the rotating shaft 5 through a fixing nut 63. A plurality of blades 62 are evenly distributed on the circumference of the hub 61 and are fixedly connected. The blades 62 and the hub 61 are of an integral structure.

[0060] Furthermore, a plurality of counterweight grooves are evenly distributed along the circumference at the top of the hub 61. By arranging counterweights in the counterweight grooves, the dynamic balance of the impeller 6 is adjusted to ensure the smoothness of its rotation.

[0061] Furthermore, the sealing structure is a sealing ring 9. The sealing ring 9 is fixedly arranged on the inner wall of the air duct of the fan outer frame 1, corresponding to the tip position of the impeller 6 of the fan, and the maximum diameter of the impeller 6 is slightly larger than the inner diameter of the sealing ring 9. Specifically, the sealing ring 9 and the inner wall of the air duct of the fan outer frame 1 are in an interference fit to improve the stability of their connection and prevent falling off during use.

[0062] Furthermore, the surface of the sealing ring 9 close to the impeller 6 is a brush surface, and the tip of the impeller 6 can contact the brush.

[0063] As Figure 4 shown is the structural diagram of the second embodiment of the cooling fan with a contact sealing structure provided by the present invention. The difference between this embodiment and Figure 1 the embodiment shown is that the inner wall of the air duct of the fan outer frame 1 has an annular fixing groove, and the sealing ring 9 is fixed in the annular fixing groove.

[0064] As Figure 5 and Figure 6 shown is the structural diagram of the third embodiment of the cooling fan with a contact sealing structure provided by the present invention. The difference between this embodiment and Figure 4The difference of the illustrated embodiment is that the sealing structure is a plurality of sealing pieces 10 uniformly arranged on the inner wall of the air duct of the fan housing 1. The sealing pieces 10 correspond to the tip positions of the impeller 6 of the fan, and the maximum diameter of the impeller 6 is slightly larger than the inner diameter of the circle formed by the plurality of sealing rings 9.

[0065] Further, a plurality of installation grooves are provided on the inner wall of the air duct of the fan housing 1 corresponding to the plurality of sealing pieces 10, and the sealing rings 9 are fixed in the installation grooves.

[0066] As Figure 7 and Figure 8 shown is a structural diagram of the fourth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and the Figure 6 illustrated embodiment is that the surface of the sealing piece 10 has a fixing groove, and the installation groove has a blind hole matching the fixing groove. The sealing piece 10 is fixedly connected to the blind hole through a fixing member by fixing the fixing groove. In this embodiment, each sealing piece 10 is fixed by one fixing member, and the fixing member can be a bolt or a screw.

[0067] As Figure 9 shown is a structural diagram of the fifth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and the Figure 7 illustrated embodiment is that in this embodiment, each sealing piece 10 is fixed by two fixing members, and the fixing members can be bolts or screws.

[0068] As Figure 10 shown is a structural diagram of the sixth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and the Figure 1 illustrated embodiment is that generally, when the impeller 6 rotates, the deformation amount of the blade tip in front of the tip is greater than the deformation amount of the blade tail behind the tip. Therefore, the blade tip contacts the sealing ring 9 more, which will further cause greater friction between the blade tip and the sealing ring. Therefore, shortening the height of the sealing ring 9 can avoid the contact between the blade tip and the sealing ring, while the blade tail can still maintain a small contact with the sealing ring 9, ensuring the dynamic sealing effect.

[0069] In this embodiment, due to the position setting, the height of the blade tip of the impeller 6 is higher than the height of the blade tail. Therefore, the height of the sealing ring 9 is reduced to Figure 1 half of that of the illustrated embodiment, which can avoid contact with the blade tip and maintain contact with the blade tail.

[0070] As Figure 11 shown is a structural diagram of the seventh embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and the Figure 1 illustrated embodiment is that in this embodiment, due to the position setting, the height of the blade tip of the impeller 6 is higher than the height of the blade tail. Therefore, the height of the sealing ring 9 is reduced toFigure 1 One-third of the illustrated embodiment can avoid contact at the blade tip while maintaining contact with the blade root.

[0071] As Figure 12 Shown is a structural diagram of the eighth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and Figure 6 the illustrated embodiment is that, in this embodiment, due to the position setting, the blade tip height of the impeller 6 is higher than the blade root height. Therefore, the height of the sealing piece 10 is reduced to Figure 6 half of the illustrated embodiment, which can avoid contact at the blade tip while maintaining contact with the blade root.

[0072] As Figure 13 Shown is a structural diagram of the ninth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and Figure 6 the illustrated embodiment is that, in this embodiment, due to the position setting, the blade tip height of the impeller 6 is higher than the blade root height. Therefore, the height of the sealing piece 10 is reduced to Figure 6 one-third of the illustrated embodiment, which can avoid contact at the blade tip while maintaining contact with the blade root.

[0073] As Figure 14 Figure 15 Shown is a structural diagram of the tenth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and Figure 1 the illustrated embodiment is that, in this embodiment, the fan outer frame 1 and its air duct size are smaller than Figure 1 the fan outer frame 1 and its air duct size of the illustrated embodiment.

[0074] In addition, in this embodiment, the connecting rod of the motor bracket 2 extending radially is an arc-shaped rod, which can adapt to the direction of air flow and reduce the resistance of air intake.

[0075] As Figure 16 Shown is a structural diagram of the eleventh embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and Figure 14 the illustrated embodiment is that there is an annular fixing groove on the inner wall of the air duct of the fan outer frame 1, and the sealing ring 9 is fixed in the annular fixing groove.

[0076] As Figure 17 Shown is a structural diagram of the twelfth embodiment of the heat dissipation fan with a contact sealing structure provided by the present utility model. The difference between this embodiment and Figure 16 the illustrated embodiment is that the sealing structure is a plurality of sealing pieces 10 uniformly arranged on the inner wall of the air duct of the fan outer frame 1. The sealing pieces 10 correspond to the blade tip positions of the impeller 6 of the fan, and the maximum diameter of the impeller 6 is slightly larger than the inner diameter of the circle formed by the plurality of sealing rings 9.

[0077] Furthermore, a plurality of mounting grooves are provided on the inner wall of the air duct of the fan outer frame 1 corresponding to the plurality of sealing pieces 10, and the sealing ring 9 is fixed in the mounting grooves.

[0078] As Figure 18 shown is a structural diagram of the thirteenth embodiment of the heat dissipation fan with a contact sealing structure provided by the present invention. The difference between this embodiment and the Figure 17 embodiment shown is that the surface of the sealing piece 10 has a fixing groove, and the mounting groove has a blind hole matching the fixing groove. The sealing piece 10 is fixedly connected to the blind hole through a fixing member by fixing the fixing groove. In this embodiment, each sealing piece 10 is fixed by one fixing member, and the fixing member can be a bolt or a screw.

[0079] As Figure 19 shown is a structural diagram of the fourteenth embodiment of the heat dissipation fan with a contact sealing structure provided by the present invention. The difference between this embodiment and the Figure 18 embodiment shown is that in this embodiment, each sealing piece 10 is fixed by two fixing members, and the fixing members can be bolts or screws.

[0080] The above are only schematic specific embodiments of the present invention. Without departing from the concept and principle of the present invention, any equivalent changes and modifications made by any person skilled in the art shall fall within the scope of protection of the present invention.

Claims

1. A contact sealing structure, characterized in that, The sealing structure is a sealing ring (9), which is fixedly arranged on the inner wall of the air duct of the fan outer frame (1), corresponding to the tip position of the impeller (6) of the fan, and the maximum diameter of the impeller (6) is greater than the inner diameter of the sealing ring (9).

2. The contact sealing structure according to claim 1, characterized in that There is an annular fixing groove on the inner wall of the air duct of the fan outer frame (1), and the sealing ring (9) is fixed in the annular fixing groove.

3. The contact sealing structure according to claim 1 or 2, characterized in that, One side of the sealing ring (9) close to the impeller (6) is a brush surface, and the tip of the impeller (6) can contact the brush.

4. The contact sealing structure according to claim 3, wherein The diameter of the brush surface of the sealing ring (9) is smaller than the diameter of the inner wall of the air duct of the fan outer frame (1).

5. A contact sealing structure, characterized in that, The sealing structure is a plurality of sealing pieces (10) evenly arranged on the inner wall of the air duct of the fan outer frame (1), the sealing pieces (10) correspond to the tip position of the impeller (6) of the fan, and the maximum diameter of the impeller (6) is greater than the inner diameter of the circle formed by the plurality of sealing pieces (10).

6. The contact sealing structure according to claim 5, characterized in that, There are a plurality of installation grooves corresponding to the plurality of sealing pieces (10) on the inner wall of the air duct of the fan outer frame (1), and the sealing pieces (10) are fixed in the installation grooves.

7. The contact seal structure according to claim 6, wherein, The surface of the sealing piece (10) has a fixing groove, and there is a blind hole in the installation groove that matches the fixing groove. The sealing piece (10) is fixedly connected to the blind hole through a fixing member with the fixing groove.

8. A cooling fan with a contact sealing structure, characterized in that, The cooling fan includes: a fan outer frame (1), a motor bracket (2) for fixedly arranging a motor assembly is fixedly arranged in the air duct of the fan outer frame (1), a bearing sleeve (3) is fixedly arranged on the motor bracket (2), the inner wall of the bearing sleeve (3) is rotationally connected to a rotating shaft (5) through a bearing (4), and the connecting end of the rotating shaft (5) is fixedly connected to an impeller (6); A stator assembly (7) is fixedly arranged on the outer wall of the bearing sleeve (3), and the stator assembly (7) is correspondingly arranged with a rotor assembly (8) on the impeller (6); The inner wall of the air duct of the fan outer frame (1) is provided with the sealing structure as described in any one of claims 1-7, and the impeller (6) can rotate and contact with the sealing structure to realize dynamic sealing of the fan.

9. The cooling fan with a contact seal structure according to claim 8, wherein, The impeller (6) includes a hub (61) and blades (62), wherein, The hub (61) is fixedly connected to the connecting end of the rotating shaft (5) through a fixing nut (63); The plurality of blades (62) are evenly distributed on the circumference of the hub (61) and are fixedly connected; The blade (62) and the hub (61) are of an integral structure.

10. The heat dissipation fan with a contact sealing structure according to claim 9, wherein, A plurality of counterweight grooves are evenly distributed along the circumference at the top of the hub (61).

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