Fan blade connecting structure capable of being assembled and disassembled without tool and cooling fan thereof

Abstract

The invention discloses a fan blade connecting structure capable of being assembled and disassembled without tools and a cooling fan thereof, and relates to the technical field of cooling fans, the fan blade connecting structure is arranged on an impeller shell and fan blades in the cooling fan, the impeller shell comprises a main shell body and an end cover, the end cover is matched with one axial end of the main shell body, and the end cover is matched with the other axial end of the main shell body. A plurality of first clamping grooves are formed in the wall face of the axial end, close to the position matched with the end cover, of the main shell in the circumferential direction, first connecting parts clamped in the first clamping grooves are arranged at one ends of the fan blades, and a plurality of second clamping grooves are formed in the wall face of the axial end, away from the position matched with the end cover, of the main shell in the circumferential direction. The second clamping grooves extend from the outer edge of the main shell to the center of the main shell, second connecting parts are arranged at the other ends of the fan blades, and a plurality of inserting blocks inserted into the first clamping grooves are arranged on the wall face of the edge of the end cover in the circumferential direction. And the fan blades are convenient to clean and replace.

Description

Technical Field

[0001] The present invention relates to the technical field of heat dissipation fans, and in particular to a fan blade connection structure capable of being assembled and disassembled without tools and a heat dissipation fan thereof. Background Art

[0002] The cooling fan is a commonly used component of computer equipment. It removes the heat accumulated in the computer case through its own work, thereby achieving the purpose of cooling the computer, so that the computer can work for a long time without burning out its components.

[0003] In existing cooling fans, the fan blades on the impeller are usually integrally formed with the impeller housing. After long-term use, dust will remain on the blades, which will affect the rotation of the impeller. In order to change this phenomenon, people will clean the fan blades, but the structure in which the fan blades and the impeller housing are integrally formed will affect the cleaning work of the fan blades. Even when a fan blade on the impeller is damaged and needs to be replaced, the damaged fan blade cannot be removed and the entire impeller needs to be replaced, thereby increasing the maintenance cost of the cooling fan; moreover, the integrated impeller structure is the component that needs to be disassembled first when the internal components of the cooling fan are damaged, and the disassembly of the integrated impeller structure often requires tools, which is difficult to operate in the chassis of computer equipment, and the assembly and disassembly operations will have a certain impact on the tightness of the connection between the impeller and the rotor. Summary of the invention

[0004] In view of the technical defects existing in the background technology, the present invention proposes a fan blade connection structure and a heat dissipation fan thereof that can be assembled and disassembled without tools, which solves the above technical problems and meets the actual needs. The specific technical solution is as follows: The present invention discloses a tool-free fan blade connection structure, which is arranged at an impeller housing and a fan blade in a heat dissipation fan, wherein the impeller housing comprises a main housing and an end cover, the end cover is matched with one of the axial ends of the main housing, the axial end wall surface of the main housing close to the end cover is circumferentially provided with a plurality of first clamping grooves, one end of the fan blade is provided with a first connecting portion clamped in the first clamping groove, the axial end wall surface of the main housing away from the end cover is circumferentially provided with a plurality of second clamping grooves, the second clamping grooves extend from the outer edge of the main housing to the center of the main housing, the other end of the fan blade is provided with a second connecting portion, the wall surface at the edge of the end cover is circumferentially provided with a plurality of inserting blocks, the inserting blocks are inserted in the first clamping groove, and the first connecting portion is driven to slide in the first clamping groove by the rotation of the end cover, so that the second connecting portion is screwed into the second clamping groove, thereby realizing the detachable connection between the fan blade and the impeller housing.

[0005] As a further embodiment of the present invention, the end of the second clamping groove close to the center side of the main shell is a recessed portion for clamping the second connecting portion, the recessed portion is recessed toward the axial end of the main shell where the first clamping groove is located and the cross-sectional area is larger than the cross-sectional area of ​​the clamping portion, the projection shape of the part of the second clamping groove located on the outside of the recessed portion on the plane perpendicular to the center axis direction of the main shell is arc-shaped, and its opening faces the direction away from the center axis side of the main shell, and the height of the second clamping groove tends to gradually decrease from the side close to the recessed portion to the opening direction of the second clamping groove.

[0006] As a further embodiment of the present invention, the main shell wall outside the two sides of the second clamping groove and the main shell wall on the opening side of the second clamping groove are both provided with rounded corners, and the recessed portion and the second clamping groove part outside it are transitioned through an arc surface.

[0007] As a further embodiment of the present invention, the second connection portion is hook-shaped, and two adjacent wall surfaces of the second connection portion away from the fan blade side are transitioned through rounded corners.

[0008] As a further embodiment of the present invention, a clamp is formed between the first connecting portion and the end of the fan blade, and the clamp is engaged with the wall surface of the main shell at the outer edge of the first clamping groove. The wall surface of the main shell at one end of the outer edge of the first clamping groove is provided with a first inclined surface, and the distance from the first inclined surface to the engagement point between the main shell and the end cover gradually decreases from the middle of the first clamping groove to the end of the first clamping groove.

[0009] As a further embodiment of the present invention, the first snap-in groove is stepped, and the distance from its inner edge to the mating point of the main shell and the end cover is greater than the distance from its outer edge to the mating point of the main shell and the end cover, the portion of the first connecting portion extending to the inner edge of the first snap-in groove is an extension portion, one end of the extension portion is provided with a second inclined surface, and the wall surface of the main shell located at one end of the inner edge of the first snap-in groove is provided with a third inclined surface with the same inclination direction as the second inclined surface, and the distance from the third inclined surface to the mating point of the main shell and the end cover gradually decreases from the middle of the first snap-in groove to the end of the first snap-in groove.

[0010] As a further embodiment of the present invention, the insertion block is inserted into the inner edge of the first clamping groove, and the end of the insertion block away from the end cover side is provided with a fourth inclined surface, and the inclination direction of the fourth inclined surface is the same as the inclination direction of the third inclined surface.

[0011] As a further embodiment of the present invention, the axial end face of the end cover on the outside of the insertion block is provided with a circle of first flanges, and the axial end face of the main shell body close to the first clamping groove is provided with a second flange with an arc-shaped cross-section. When the end cover is matched with the axial end of the main shell body, the projection formed by the first flange on the plane perpendicular to the axis of the main shell body is located outside the projection formed by the second flange on the plane perpendicular to the axis of the main shell body, the wall surface at the inner edge of the first flange is provided with a spiral first flange, and the wall surface at the outer edge of the second flange is provided with a second flange. The main shell body is connected to the main shell body by clamping between the first flange and the second flange.

[0012] The present invention also discloses a heat dissipation fan, comprising a frame, a stator, a rotor and the above-mentioned fan blade connection structure, wherein the stator is arranged in the middle of the positioning frame, the rotor is connected to the outside of the stator, and a matching hole is provided in the middle of the main shell, the rotor is matched in the matching hole and fixedly connected to the main shell.

[0013] The beneficial effects of the present invention are as follows: the fan blade connection structure connects the fan blades to the impeller housing in a detachable manner, so that the fan blades can be removed from the impeller housing, which is convenient for cleaning and replacing the fan blades. The operation of installing the fan blades is simple and convenient, and the fan blades can be firmly connected to the impeller housing and will not become loose when the impeller rotates. The fan blades can be installed and removed without the aid of tools, which is convenient for maintenance of the heat dissipation fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the fan blade connection structure Figure 1 .

[0015] Figure 2 Schematic diagram of the fan blade connection structure Figure 2 .

[0016] Figure 3 The structure of the second clamping slot is shown in FIG. Figure 1 .

[0017] Figure 4 The structure of the second card slot is shown in FIG. Figure 2 .

[0018] Figure 5 It is a structural schematic diagram of the second connecting part.

[0019] Figure 6 It is a schematic structural diagram of the first connecting part.

[0020] Figure 7 It is a structural schematic diagram when the first connecting portion is matched with the first clamping groove.

[0021] Figure 8It is a structural schematic diagram of the first clamping slot.

[0022] Fig. 9 It is a schematic diagram of the structure of the end cover.

[0023] Fig.10 It is a schematic structural diagram of the second convex edge.

[0024] Fig.11 This is a schematic diagram of the fan blades after they are connected to the main housing and fixed in position.

[0025] Fig.12 It is a structural schematic diagram of a heat dissipation fan with the fan blade connection structure.

[0026] In the figure, 1, impeller casing; 11, main casing; 111, first snap-in groove; 112, second snap-in groove; 1121, recessed portion; 113, first inclined surface; 114, third inclined surface; 115, second flange; 1151, second convex strip; 116, matching hole; 12, end cover; 121, mounting block; 1211, fourth inclined surface; 122, first flange; 1221, first convex strip; 2, fan blade; 21, first connecting portion; 211, extension portion; 2112, second inclined surface; 22, second connecting portion; 3, clamp; 4, frame; 5, stator; 6, rotor. DETAILED DESCRIPTION

[0027] The present invention discloses a fan blade connection structure that can be assembled and disassembled without tools. Figure 1 and Figure 2 As shown in the figure, the fan blade connection structure is arranged at the impeller housing 1 and the fan blade 2 in the heat dissipation fan, the impeller housing 1 includes a main housing 11 and an end cover 12, the end cover 12 is matched with one of the axial ends of the main housing 11, the main housing 11 is close to the axial end wall where the end cover 12 is matched, and a plurality of first clamping grooves 111 are circumferentially provided, one end of the fan blade 2 is provided with a first connecting portion 21 clamped in the first clamping groove 111, and the main housing 11 is away from the axial end wall where the end cover 12 is matched, and a plurality of A second snap-in groove 112 extends from the outer edge of the main shell 11 to the center of the main shell 11, and a second connecting portion 22 is provided at the other end of the fan blade 2. A plurality of insert blocks 121 are circumferentially provided on the wall surface at the edge of the end cover 12. The insert blocks 121 are inserted into the first snap-in groove 111, and the first connecting portion 21 is driven to slide in the first snap-in groove 111 through the rotation of the end cover 12, so that the second connecting portion 22 is screwed into the second snap-in groove 112, thereby realizing a detachable connection between the fan blade 2 and the impeller housing 1.

[0028] It should be noted that when installing the fan blade 2, the fan blade 2 connection structure first clamps the first connection part 21 on the wall surface of the main shell 11 in the first clamping groove 111, and then fits the second connection part 22 into the second clamping groove 112, and then fits the end cover 12 to the axial end of the main shell 11 along the matching direction of the insertion block 121 and the first clamping groove 111 outside the first connection part 21, and utilizes the movement of the insertion block 121 in the first clamping groove 111 to realize the movement of the first connection part 21 in the first clamping groove 111, and when the first connection part 21 moves in the first clamping groove 111, the second connection part 22 will be driven and screwed into the second clamping groove 112, and after the end cover 12 is fixed in the position of the axial end of the main shell 11, the position of the first connection part 21 in the first clamping groove 111 will also be fixed, and at the same time, the second connection part 22 will be clamped at the end of the second clamping groove 112 close to the center of the main shell 11, thereby realizing the installation of the fan blade 2.

[0029] When disassembling the fan blade 2, the end cover 12 is removed from the axial end of the main shell 11, and the insertion block 121 no longer restricts the position of the first connection part 21. Under the elastic recovery force of the fan blade 2, the second connection part 22 is no longer clamped in the second clamping groove 112, so that people can manually rotate the second connection part 22 out of the second clamping groove 112. In the process of rotating the second connection part 22 out of the second clamping groove 112, the first connection part 21 will move from one end of the first clamping groove 111 to the other end. Finally, you only need to pull out the first connection part 21 on the wall of the main shell 11 clamped in the first clamping groove 111 to achieve the disassembly of the fan blade 2.

[0030] Through the above-mentioned operation, the fan blades 2 can be connected to the impeller housing 1 in a detachable manner, which is convenient for cleaning and replacing the fan blades 2. The installation of the fan blades 2 is simple and convenient, and the installation and removal of the fan blades 2 can be achieved without the aid of tools. Moreover, the fan blades 2 can be firmly connected to the impeller housing 1 and will not become loose when the impeller rotates.

[0031] It needs to be further explained that if Figure 3 and Figure 4As shown in the combination, the end of the second clamping groove 112 close to the center side of the main shell 11 is a recessed portion 1121 for clamping the second connecting portion 22, and the recessed portion 1121 is recessed toward the axial end of the main shell 11 where the first clamping groove 111 is located and has a cross-sectional area greater than the cross-sectional area of ​​the clamping portion. The projection shape of the portion of the second clamping groove 112 located on the outside of the recessed portion 1121 on a plane perpendicular to the center axis direction of the main shell 11 is arc-shaped, and its opening faces in a direction away from the center axis side of the main shell 11, and the height of the second clamping groove 112 tends to gradually decrease from the side close to the recessed portion 1121 to the opening direction of the second clamping groove 112.

[0032] In the process of the second connecting portion 22 being screwed into the second clamping groove 112, since the depth of the second clamping groove 112 gradually decreases from the opening side to the side of the recessed portion 1121, if it is necessary to screw the second connecting portion 22 into the position where the recessed portion 1121 is located without manually bending the second connecting portion 22, the inserting block 121 can be moved in the first clamping groove 111 by rotating the end cover 12, and then the elastic recovery effect of the fan blade 2 can be utilized. This generates kinetic energy for the second connecting portion 22 to move in the second snap-fit ​​groove 112, and combined with the guiding effect of the second snap-fit ​​groove 112 on the second connecting portion 22, the second connecting portion 22 can smoothly enter the recessed portion 1121 of the second snap-fit ​​groove 112, and the second connecting portion 22 that reaches the position of the recessed portion 1121 will, under the elastic recovery effect of the fan blade 2, press against the wall of the main shell 11 on the side of the recessed portion 1121, thereby snapping one end of the fan blade 2 onto the main shell 11.

[0033] Specifically, Figure 3 and Figure 4 As shown in the figure, the wall surfaces of the main shell 11 outside the two sides of the second clamping groove 112 and the wall surfaces of the main shell 11 on the opening side of the second clamping groove 112 are both provided with rounded corners, and the recessed portion 1121 and the second clamping groove 112 part outside thereof are transitioned through an arc surface.

[0034] Among them, rounded corners are arranged on the wall surface of the main shell 11 outside the two sides of the second clamping groove 112, which can guide the second connecting part 22 moving in the second clamping groove 112, so that the second connecting part 22 can move along the trajectory of the second clamping groove 112 without position displacement; at the same time, the rounded corners arranged on the opening side of the second clamping groove 112 can facilitate the end of the second connecting part 22 to enter the second clamping groove 112; and after the recessed part 1121 and the second clamping groove 112 part on its outer side are transitioned through the arc surface, the movement of the second connecting part 22 moving into or out of the recessed part 1121 is smoother.

[0035] More specifically, if Figure 5 As shown, the second connection portion 22 is hook-shaped, and the two adjacent wall surfaces of the second connection portion 22 away from the fan blade 2 are transitioned through rounded corners.

[0036] Among them, the second connecting part 22 is hook-shaped, which can make the connection between the end of the fan blade 2 and the axial end of the main shell 11 tighter, and the part of the second connecting part 22 away from the fan blade 2 has multiple rounded corners on its surface, which can facilitate the second connecting part 22 to enter the second snap-in groove 112, facilitate the movement of the second connecting part 22 in the second snap-in groove 112, and facilitate the second connecting part 22 to move in or out of the recessed part 1121.

[0037] It needs to be further explained that if Figure 7~Figure 10 As shown in the combination, a clamp 3 is formed between the first connecting portion 21 and the end of the fan blade 2, and the clamp 3 is engaged with the wall surface of the main shell 11 at the outer edge of the first clamping groove 111. The wall surface of the main shell 11 at one end of the outer edge of the first clamping groove 111 is provided with a first inclined surface 113, and the distance from the first inclined surface 113 to the engagement point between the main shell 11 and the end cover 12 gradually decreases from the middle of the first clamping groove 111 to the end of the first clamping groove 111.

[0038] Among them, when installing the fan blade 2, one end of the fan blade 2 can be connected to the main shell 11 with the help of this clamp 3, and when the insertion block 121 pushes the first connecting part 21 to move in the first snap-in groove 111, the setting of the clamp 3 can make one end of the fan blade 2 move smoothly in the first snap-in groove 111; when the clamp 3 moves to the position of the first inclined surface 113 and moves along the first inclined surface 113, the entire fan blade 2 will move toward the side of the end cover 12 along the first inclined surface 113, and the second connecting part 22 will also move in the second snap-in groove 112, thereby fixing the end of the fan blade 2 away from the side of the first connecting part 21, and the position of the first connecting part 21 will also be fixed after the position of the end cover 12 is fixed, finally realizing the fixed connection between the fan blade 2 and the main shell 11.

[0039] Specifically, Figure 7~Figure 8As shown in combination, the first snap-fitting groove 111 is stepped, and the distance from its inner edge to the fitting point of the main shell 11 and the end cover 12 is greater than the distance from its outer edge to the fitting point of the main shell 11 and the end cover 12. The portion of the first connecting portion 21 extending to the inner edge of the first snap-fitting groove 111 is an extension portion 211, and one end of the extension portion 211 is provided with a second inclined surface 2112. The wall surface of the main shell 11 located at one end of the inner edge of the first snap-fitting groove 111 is provided with a third inclined surface 114 having the same inclination direction as the second inclined surface 2112. The distance from the third inclined surface 114 to the fitting point of the main shell 11 and the end cover 12 gradually decreases from the middle of the first snap-fitting groove 111 to the end of the first snap-fitting groove 111.

[0040] Among them, the stepped first clamping groove 111 allows the extension portion 211 to be restricted by the wall of the main shell 11 at the outer edge of the first clamping groove 111, thereby avoiding the first connection portion 21 from being offset during the movement in the first clamping groove 111, so that the clamp 3 can maintain the cooperation with the wall of the main shell 11 at the outer edge of the first clamping groove 111, so that the fan blade 2 can move in the first clamping groove 111 along a specified moving trajectory; and the setting of the third inclined surface 114 also serves to guide the extension portion 211, so that the entire first connection portion 21 can move in the first clamping groove 111 along a specified moving trajectory, thereby realizing the movement of the entire fan blade 2 in a specified direction, and then the two ends of the fan blade 2 can be fixed on the main shell 11.

[0041] More specifically, if Fig. 9 As shown, the insertion block 121 is inserted into the inner edge of the first clamping groove 111 , and the end of the insertion block 121 away from the end cover 12 is provided with a fourth inclined surface 1211 , and the inclination direction of the fourth inclined surface 1211 is the same as the inclination direction of the third inclined surface 114 .

[0042] When the insert block 121 is inserted into the first engaging groove 111, the gap between the first connecting portion 21 and the wall of the main housing 11 outside the end of the first engaging groove 111 does not allow the entire insert block 121 to be directly inserted into the first engaging groove 111. If multiple identical structures are provided on the main housing 11, all identical structures need to be operated simultaneously to insert all the insert blocks 121 on the end cover 12 into the first engaging groove 111. The arrangement of 1 can make the insertion block 121 contact the end of the first connecting portion 21 through the fourth inclined surface 1211 when it is directly inserted into the first engaging groove 111, so that the end of the first connecting portion 21 and the insertion block 121 are relatively displaced, the first connecting portion 21 moves in the first engaging groove 111, and the spacing distance between the position of the first connecting portion 21 and the wall surface of the main shell 11 outside the end of the first engaging groove 111 is continuously increased, so that the insertion block 121 can enter the first engaging groove 111 in a direct insertion manner.

[0043] It needs to be further explained that if Figure 9~Figure 11 As shown in the combination, the axial end face of the end cover 12 on the outer side of the insertion block 121 is provided with a circle of first flange 122, and the axial end face of the main shell 11 close to the first clamping groove 111 is provided with a second flange 115 with an arc-shaped cross-section. When the end cover 12 is matched with the axial end of the main shell 11, the projection formed by the first flange 122 on the plane perpendicular to the axis of the main shell 11 is located outside the projection formed by the second flange 115 on the plane perpendicular to the axis of the main shell 11, the wall surface at the inner edge of the first flange 122 is provided with a spiral first convex strip 1221, and the wall surface at the outer edge of the second flange 115 is provided with a second convex strip 1151. The main shell 11 is connected to the main shell 11 by clamping between the first convex strip 1221 and the second convex strip 1151.

[0044] Among them, because the position of the fan blade 2 needs to be fixed, and the end of the fan blade 2 where the first connecting portion 21 is located needs to be fixed by rotating the insert block 121, so when the end cover 12 is matched to the axial end of the main shell 11, it is necessary to cooperate with the action of rotating the end cover 12 to complete the rotation operation of the insert block 121. In the process of rotating the end cover 12, the second convex strip 1151 on the second convex edge 115 is clamped in the first convex strip 1221 on the first convex edge 122, so as to achieve the effect of matching the end cover 12 to the main shell 11, which can not only close the axial end of the main shell 11, but also realize the position fixation of the fan blade 2 connected to the main shell 11.

[0045] The present invention also discloses a heat dissipation fan. Fig.12As shown, it includes a frame 4, a stator 5, a rotor 6 and the above-mentioned fan blade 2 connection structure, the stator 5 is arranged in the middle of the positioning frame, the rotor 6 is connected to the outside of the stator 5, and a matching hole 116 is provided in the middle of the main shell 11. The rotor 6 is matched in the matching hole 116 and is fixedly connected to the main shell 11.

[0046] It should be noted that: since the end cover 12 needs to be removed before the fan blades 2 can be removed, after the end cover 12 is removed, the stator 5 and the rotor 6 located in the matching hole 116 can also be observed by people, which can facilitate people to check the condition of the stator 5 or the rotor 6 inside the cooling fan, making the maintenance operation of the cooling fan easier.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fan blade connection structure that can be assembled and disassembled without tools, the fan blade connection structure is arranged at the impeller housing and the fan blade in the heat dissipation fan, characterized in that: The impeller housing includes a main housing and an end cover, the end cover is fitted into one of the axial ends of the main housing, the main housing is provided with a plurality of first clamping grooves in the circumferential direction on the axial end wall surface close to the end cover, one end of the fan blade is provided with a first connecting portion clamped into the first clamping groove, the main housing is provided with a plurality of second clamping grooves in the circumferential direction on the axial end wall surface away from the end cover, the second clamping grooves extend from the outer edge of the main housing to the center of the main housing, the other end of the fan blade is provided with a second connecting portion, the wall surface at the edge of the end cover is provided with a plurality of insert blocks in the circumferential direction, the insert blocks are inserted into the first clamping groove, and the first connecting portion is driven to slide in the first clamping groove by the rotation of the end cover, so that the second connecting portion is screwed into the second clamping groove, thereby realizing the detachable connection between the fan blade and the impeller housing.

2. The fan blade connection structure according to claim 1, characterized in that: The end of the second clamping groove close to the center side of the main shell is a recessed portion for clamping the second connecting portion. The recessed portion is recessed toward the axial end of the main shell where the first clamping groove is located and has a cross-sectional area larger than the cross-sectional area of ​​the clamping portion. The projection shape of the portion of the second clamping groove located outside the recessed portion on a plane perpendicular to the center axis direction of the main shell is arc-shaped, and its opening faces a direction away from the center axis side of the main shell. The height of the second clamping groove tends to gradually decrease from the side close to the recessed portion to the opening direction of the second clamping groove.

3. The fan blade connection structure according to claim 2, characterized in that: The main shell wall surfaces outside the two sides of the second clamping groove and the main shell wall surface on the opening side of the second clamping groove are both provided with rounded corners, and the recessed portion and the second clamping groove portion outside thereof are transitioned through an arc surface.

4. The fan blade connection structure according to claim 3, characterized in that: The second connection portion is hook-shaped, and two adjacent wall surfaces of the second connection portion away from the fan blade side are transitioned through rounded corners.

5. The fan blade connection structure according to claim 1, characterized in that: A clamp is formed between the first connecting portion and the end of the fan blade, and the clamp is engaged with the wall surface of the main shell at the outer edge of the first snap-in groove. The wall surface of the main shell at one end of the outer edge of the first snap-in groove is provided with a first inclined surface, and the distance from the first inclined surface to the engagement point between the main shell and the end cover gradually decreases from the middle of the first snap-in groove to the end of the first snap-in groove.

6. The fan blade connection structure according to claim 5, characterized in that: The first snap-fit ​​groove is stepped, and the distance from its inner edge to the mating point of the main shell and the end cover is greater than the distance from its outer edge to the mating point of the main shell and the end cover. The portion of the first connecting portion extending to the inner edge of the first snap-fit ​​groove is an extension portion, and one end of the extension portion is provided with a second inclined surface. The wall surface of the main shell at one end of the inner edge of the first snap-fit ​​groove is provided with a third inclined surface having the same inclination direction as the second inclined surface, and the distance from the third inclined surface to the mating point of the main shell and the end cover gradually decreases from the middle of the first snap-fit ​​groove to the end of the first snap-fit ​​groove.

7. The fan blade connection structure according to claim 6, characterized in that: The insert block is inserted in the inner edge of the first clamping groove, and the end of the insert block away from the end cover is provided with a fourth inclined surface, and the inclination direction of the fourth inclined surface is the same as the inclination direction of the third inclined surface.

8. The fan blade connection structure according to claim 1, characterized in that: The axial end face of the end cover on the outside of the insertion block is provided with a circle of first convex edges, and the axial end face of the main shell body close to the first clamping groove is provided with a second convex edge with an arc-shaped cross-section. When the end cover is matched with the axial end of the main shell body, the projection formed by the first convex edge on the plane perpendicular to the axis of the main shell body is located outside the projection formed by the second convex edge on the plane perpendicular to the axis of the main shell body. The wall surface at the inner edge of the first convex edge is provided with a spiral first convex strip, and the wall surface at the outer edge of the second convex edge is provided with a second convex strip. The main shell body is connected to the main shell body by clamping the first convex strip and the second convex strip.

9. A heat dissipation fan, comprising a frame, a stator, a rotor and a fan blade connection structure according to any one of claims 1 to 8, wherein the stator is arranged in the middle of the positioning frame, and the rotor is connected to the outside of the stator, characterized in that: A matching hole is provided in the middle of the main housing, and the rotor is matched in the matching hole and fixedly connected to the main housing.

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