Fan head connecting structure and electric fan

Abstract

The utility model discloses a fan head connecting structure and an electric fan, the fan head connecting structure comprises a support arm and a connector, one side of the upper end of the support arm is provided with a first groove, two sides of the first groove are respectively provided with a lug which is inclined upwards, and the lower part of the lug is fixedly connected with the support arm; the connector comprises a rotating part and a shaft sleeve used for being connected with the fan head, the shaft sleeve is fixedly connected with the rotating part, the rotating part is arranged in the first groove, and the rotating part and the convex lug are rotationally connected and locked through a pin shaft. The fan head connecting structure provided by the utility model can effectively weaken the problem of fan operation shaking, the fan operation is stable, and particularly, the fan head connecting structure has a remarkable effect on large-size and high-rotating-speed electric fan products, and is high in practicability, safe and reliable in structure and convenient to install.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ventilation equipment technical field more specifically, a fan head connecting structure and electric fan. BACKGROUND

[0002] Electric fan is a kind of household appliance using motor to drive fan blade rotation, to achieve air accelerated flow, mainly for cooling and air circulation, widely used in family, classroom, office, shop, hospital and hotel etc., among which floor fan is the most.Electric fan generally includes mesh cover, fan blade, fan head and support structure etc., fan head is installed on support structure through fan head connecting structure, and fan head connecting structure is used to realize the pitch adjustment of fan head, and fan head can also generally shake left and right.But, some large size specifications, high-speed electric fan is easy to cause jitter when running, not only affects user experience and makes product life shortens. SUMMARY

[0003] The utility model discloses to overcome the defect that the above-mentioned prior art large size, high-speed electric fan is easy to jitter, provide a fan head connecting structure, the fan head connecting structure provided can effectively weaken the problem of fan running jitter, fan running is stable, especially for large size specifications, high-speed electric fan product effect is remarkable, practicality is strong, and structure is safe and reliable, and easy to install.

[0004] To solve the above technical problem, the technical scheme adopted by the utility model is:

[0005] A fan head connecting structure, including support arm and connecting head, the first recess is equipped on the upper end of the support arm, the first recess is equipped with the lug that is inclined to set up upwards respectively on both sides, the lug lower part is fixedly connected with the support arm;

[0006] The connecting head includes rotating part and the shaft sleeve for connecting fan head, the shaft sleeve is fixedly connected with rotating part, and the rotating part is arranged in the first recess, and the rotating part is rotatably connected with the lug through pin shaft and is locked.

[0007] The support arm of the existing fan head connecting structure is generally provided with a pair of straight upward extending lugs on the upper end, and is an open support arm structure.The existing fan head connecting structure is used for large size specifications, high-speed electric fan, and is easy to cause jitter.Inventor uses unique semi-open support arm structure through a large number of researches, specifically, first recess is arranged on one side of the upper end of support arm, and then a pair of lugs are arranged to be inclined upwards, and the lower part of the lug is fixedly connected with the support arm, so that the locking between the support arm and the connecting head is more stable, effectively reduces the problem of fan running jitter, and the fan runs stably, especially for large size specifications, high-speed electric fan product effect is remarkable, practicality is strong, and structure is safe and reliable, and easy to install.

[0008] Preferably, the lower part of the arm is cylindrical, the outer diameter of the lower part of the arm is D; the center line of the shaft sleeve is perpendicular to the center line of the rotation shaft of the rotating part, the shortest distance between the center line of the shaft sleeve and the center line of the rotation shaft of the rotating part is L1; the center line of the rotation shaft of the rotating part is perpendicular to the center line of the cylinder of the lower part of the arm, the shortest distance between the center line of the rotation shaft of the rotating part and the center line of the cylinder of the lower part of the arm is L2, the ratio of L2 to D is in the range of 0.4-0.8, and the ratio of the sum of L1 and L2 to D is in the range of 0.7-1.3.

[0009] The inventor found through research that the smaller L1 and L2 are, the better the effect of reducing fan running vibration is; however, if L1 and L2 are too small, the pitch angle adjustment will be affected. When the diameter D of the arm is a certain value, by controlling the size range of L1 and L2, the problem of fan running vibration can be better reduced, and at the same time the pitch angle adjustment range of the fan head can meet the daily use requirements.

[0010] More preferably, the ratio of L2 to D is 0.47, and the ratio of the sum of L1 and L2 to D is 1.0.

[0011] Preferably, the end of the lug is semicircular.

[0012] Preferably, the side of the rotating part close to the arm is semicircular.

[0013] Preferably, the rotating part is connected with the lug by bolts and locked.

[0014] Preferably, the other side of the upper end of the arm is provided with a wire cover which is detachably connected with the arm, and the wire cover is provided with a wire opening. The wire of the electric fan can pass out through the wire opening.

[0015] Preferably, the wire cover comprises a cover body and a plug-in part provided at the lower end of the cover body, the plug-in part is provided with guide flanges on both sides, and the arm is provided with guide grooves matched with the guide flanges. This can ensure safety and reliability, and is easy to install.

[0016] Preferably, the wire opening is located at the lower end of the plug-in part.

[0017] Preferably, the cover body is provided with a plurality of buckles for fixing the cover body.

[0018] Preferably, the rotating part is located between the two lugs.

[0019] Preferably, the fan head connecting structure further comprises a rotation positioning assembly, the rotation positioning assembly comprises a positioning sheet, a positioning spring and a positioning ball, the positioning sheet is connected with the lug, the positioning sheet is provided with a plurality of positioning holes, the rotating part is provided with an accommodating groove for accommodating the positioning spring and the positioning ball, one end of the positioning spring abuts against the rotating part, the other end of the positioning spring abuts against the positioning ball, and the positioning ball abuts against the positioning hole. By arranging the rotation positioning assembly, the fan head can be better positioned when the pitch angle is adjusted, the connection between the support arm and the connecting head is more stable, and the problem of fan operation shaking is better reduced.

[0020] Preferably, the positioning sheet is located between the rotating part and the lug, the rotating part and the lug clamp the positioning sheet, and at least two protrusions are arranged on the side of the positioning sheet close to the lug, the lug is provided with fixing holes corresponding to the protrusions, and the protrusions are inserted into the fixing holes. Since the rotating part and the lug clamp the positioning sheet, and the protrusions and the corresponding fixing holes are arranged, the positioning sheet can be prevented from rotating, and the positioning sheet is fixed at this time. That is, the positioning sheet does not need to be fixed by screws, and the protrusions can be inserted into the fixing holes during installation, so that the installation is convenient and fast.

[0021] Preferably, the fan head connecting structure further comprises a torsion spring, the torsion spring is sleeved on the pin shaft, one torsion arm of the torsion spring is connected with the connecting head, and the other torsion arm of the torsion spring is connected with the support arm. The torsion spring can exert a certain torque on the support arm and the connecting head, so that the fan head is more stable after the pitch angle is positioned, and the problem of fan operation shaking of large size specifications and high speed is further reduced. Moreover, the torsion spring can also increase the center feeling of the pitch angle adjustment of the fan head. When the fan head is adjusted from horizontal blowing to upward blowing or downward blowing, the torsion spring exerts a certain reverse torque. When the fan head of upward blowing or downward blowing is adjusted to horizontal blowing, the torsion spring increases a certain positive torque.

[0022] Preferably, the rotating part is provided with a second groove, and the torsion spring is arranged in the second groove.

[0023] Preferably, the torsion spring is sleeved on the bolt.

[0024] Preferably, one side of the rotating part is close to the rotation positioning assembly, and the torsion spring is located at the other side of the rotating part.

[0025] The utility model also provides a electric fan, including base, support column, fan head, fan blade and mesh cover, the electric fan further includes above-mentioned fan head connecting structure, the fan head is connected with the shaft sleeve rotationally, and the lower end of support arm is connected with support column.

[0026] Preferably, the fan head comprises a main motor, a motor support shaft, a motor front baffle, a motor rear cover, the main motor comprises a main motor shell, the motor support shaft is fixedly connected with the main motor shell, the motor front baffle is fixedly connected with the main motor shell, and the motor rear cover is fixedly connected with the motor front baffle; the motor support shaft is rotatably connected with the shaft sleeve; the main motor is provided with a motor rotating shaft, and the motor rotating shaft is fixedly connected with the fan blade.

[0027] Preferably, the bottom of the motor support shaft is provided with a circlip for preventing the motor support shaft from loosening.

[0028] Preferably, the fan head further comprises a synchronous motor and a head swinging connecting rod, the synchronous motor comprises a synchronous motor shell, the synchronous motor shell is fixedly connected with the main motor shell, the synchronous motor is provided with a rotating shaft cam, one end of the head swinging connecting rod is rotatably connected with the rotating shaft cam, and the other end is rotatably connected with the connecting head.

[0029] Preferably, the fan head further comprises a synchronous motor support, one side of the synchronous motor support is fixedly connected with the main motor shell, and the synchronous motor is fixedly connected with the synchronous motor support.

[0030] Preferably, the electric fan further comprises a middle box, the middle box is provided with a second rotating speed gear switch, the upper end of the middle box is connected with the lower end of the supporting arm, and the lower end of the middle box is connected with the supporting column.

[0031] Preferably, the lower end of the supporting arm can be sleeved on the upper end of the supporting column and can also be sleeved in the upper end of the middle box. The fan head connecting structure can be directly combined with the supporting column and can also be matched with the middle box, a plurality of switch control modes can be combined, the structure is suitable for multiple scene applications, the supporting arm connecting part does not need to be changed, and the above scheme does not need to increase costs additionally.

[0032] Compared with the prior art, the fan head connecting structure has the following beneficial effects:

[0033] The fan head connecting structure adopts a unique semi-open supporting arm structure, specifically, a first groove is arranged on one side of the upper end of the supporting arm, and a pair of upwardly inclined lugs are arranged, the lower part of the lug is fixedly connected with the supporting arm, the locking between the supporting arm and the connecting head is more stable, the problem of fan operation shaking is effectively reduced, the fan operates stably, the effect is remarkable for large-size specification and high-speed electric fan products, the structure is safe and reliable, and installation is convenient. Moreover, the fan head connecting structure can combine a plurality of switch control modes, is suitable for multiple scene applications, and the connecting part does not need to be changed, and the above scheme does not need to increase costs additionally. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a schematic view of the fan head connecting structure of the utility model embodiment 1.

[0035] Figure 2 It is the exploded view of the fan head connecting structure of the utility model embodiment 1.

[0036] Figure 3 It is the side view of the fan head connecting structure of the utility model embodiment 1.

[0037] Figure 4 It is the side view of the electric fan of the utility model embodiment 3.

[0038] Figure 5 It is the schematic view of the electric fan of the utility model embodiment 3.

[0039] Figure 6 It is the exploded view of the fan head, fan blade and screen cover in the electric fan of the utility model embodiment 3.

[0040] Figure 7 It is the side view of the electric fan of the utility model embodiment 4.

[0041] Reference signs

[0042] 1-branch arm, 101-first recess, 102-lug, 103-wire cover, 1031-wire opening, 1032-cover body, 1033-plug part, 1034-guiding flange, 1035-guiding recess, 104-pin shaft;2-connection head, 201-rotating part, 2011-second recess, 202-shaft sleeve;3-rotating positioning assembly, 301-positioning sheet, 3011-protrusion, 3012-fixing hole, 3013-positioning hole, 302-positioning spring, 303-positioning ball;4-torsion spring;5-wire;60-base;61-supporting column;62-fan blade;63-screen cover, 631-front screen cover, 632-rear screen cover, 633-screen ring, 634-screen ring decoration cover;64-middle box, 641-second rotating speed gear switch;70-fan head, 701-main motor, 7011-motor rotating shaft, 702-motor supporting shaft, 7021-clamp spring, 703-motor front baffle, 704-motor rear cover, 705-synchronous motor, 706-oscillating head connecting rod, 707-synchronous motor support, 708-oscillating head switch, 709-first rotating speed gear switch, 7091-knob, 7092-switch body. DETAILED DESCRIPTION

[0043] The utility model will be further explained in connection with specific implementation.

[0044] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent.

[0045] Furthermore, if terms such as "first" or "second" are used for descriptive purposes only, they are mainly used to distinguish different devices, components or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, components or parts, and should not be construed as indicating or implying relative importance.

[0046] Example 1

[0047] This embodiment provides a fan head connection structure, such as Figures 1-3 As shown, the device includes a support arm 1 and a connector 2. The support arm 1 has a first groove 101 on one side of its upper end, and a wire cover 103 detachably connected to the support arm 1 on the other side of its upper end. The wire cover 103 has a wire opening 1031. The wire 5 passes through the wire opening 1031. The first groove 101 has upwardly inclined lugs 102 on both sides, with the lower part of the lugs 102 fixedly connected to the support arm 1. The connector 2 includes a rotating part 201 and a bushing 202 for connecting to the fan head. The bushing 202 is fixedly connected to the rotating part 201. The rotating part 201 is located in the first groove 101 between the two lugs 102. The rotating part 201 and the lugs 102 are rotatably connected and locked by a pin 104. The end of the lug 102 is semi-circular, and the side of the rotating part 201 closest to the support arm 1 is also semi-circular. The pin 104 can be made of bolts, that is, the rotating part 201 and the lug 102 are connected and locked by bolts.

[0048] The fan head connection structure in this embodiment adopts a unique semi-open support arm structure, which makes the locking between the support arm 1 and the connector 2 more secure, effectively reducing the problem of fan vibration during operation. The fan runs smoothly, and the effect is particularly significant for large-size, high-speed electric fans. It is highly practical, structurally safe and reliable, and easy to install.

[0049] In the embodiment, the lower part of the arm 1 is cylindrical, and the outer diameter of the lower part of the arm 1 is D; the center line of the shaft sleeve 202 is perpendicular to the center line of the rotating shaft of the rotating part 201, and the shortest distance between the center line of the shaft sleeve 202 and the center line of the rotating shaft of the rotating part 201 is L1; the center line of the rotating shaft of the rotating part 201 is perpendicular to the center line of the cylinder of the lower part of the arm 1, and the shortest distance between the center line of the rotating shaft of the rotating part 201 and the center line of the cylinder of the lower part of the arm 1 is L2. The inventor finds through research that the smaller L1 and L2 are, the better the effect of reducing the fan running jitter is; however, if L1 and L2 are too small, the pitch angle adjustment will be affected. When the diameter D of the arm is a certain value, by controlling the size range of L1 and L2, the problem of fan running jitter can be better reduced, and at the same time, the pitch angle adjustment range of the fan head can meet the daily use requirements. Specifically, the ratio of L2 to D is in the range of 0.4-0.8, and the ratio of the sum of L1 and L2 to D is in the range of 0.7-1.3. As an embodiment, when the fan head connecting structure of the embodiment is used for a 20-inch floor fan, D is 51 mm, L1 is 27 mm, and L2 is 24 mm.

[0050] The wire cover 103 comprises a cover body 1032 and a plug-in part 1033 arranged at the lower end of the cover body 1032, and guide flanges 1034 are arranged at both sides of the plug-in part 1033, and the arm 1 is provided with guide grooves 1035 matched with the guide flanges 1034. The wire opening 1031 is arranged at the lower end of the plug-in part 1033. The cover body 1032 is provided with a plurality of buckles for fixing the cover body 1032.

[0051] The fan head connecting structure of the embodiment further comprises a rotation positioning assembly 3, which comprises a positioning sheet 301, a positioning spring 302 and a positioning ball 303. The positioning sheet 301 is connected with the lug 102, and is located between the rotating part 201 and the lug 102, and is clamped by the rotating part 201 and the lug 102. The side of the positioning sheet 301 close to the lug is provided with at least two protrusions 3011, and the lug 102 is provided with fixed holes 3012 corresponding to the protrusions 3011, and the protrusions 3011 are inserted into the fixed holes 3012. The positioning sheet 301 is provided with a plurality of positioning holes 3013, and the rotating part 201 is provided with accommodating grooves for accommodating the positioning spring 302 and the positioning ball 303, one end of the positioning spring 302 abuts against the rotating part 201, the other end of the positioning spring 302 abuts against the positioning ball 303, and the positioning ball 303 abuts against the positioning hole 3013. The rotation positioning assembly 3 can better position the fan head when adjusting the pitch angle, and the connection between the support arm 1 and the connecting head 2 is more stable, and the problem of fan operation shaking is better reduced. Moreover, the rotating part 201 and the lug 102 clamp the positioning sheet, and then the protrusions 3011 and the corresponding fixed holes 3012 are arranged, so that the positioning sheet 301 is prevented from rotating, and at this time, the positioning sheet 301 is fixed. That is, the positioning sheet 301 does not need to be fixed by screws, and when installing, the protrusions 3011 can be simply put into the fixed holes 3012, so that the installation is convenient and fast.

[0052] The fan head connecting structure of the embodiment further comprises a torsion spring 4, which is sleeved on the pin shaft 104, one torsion arm of the torsion spring 4 is connected with the connecting head 2, and the other torsion arm of the torsion spring 4 is connected with the support arm 1. The rotating part 201 is provided with a second groove 2011, and the torsion spring 4 is arranged in the second groove 2011. One side of the rotating part 201 is close to the rotation positioning assembly 3, and the torsion spring 4 is located on the other side of the rotating part 201. The torsion spring 4 can exert a torque on the support arm 1 and the connecting head 2, so that the fan head is more stable after being positioned at the pitch angle, and the problem of fan operation shaking of large size specifications and high speed is further reduced. Moreover, the torsion spring 4 can also increase the center feeling of the fan head pitch angle adjustment. When the fan head is adjusted from horizontal blowing to upward blowing or downward blowing, the torsion spring 4 will exert a reverse torque; when the fan head of upward or downward blowing is adjusted to horizontal blowing, the torsion spring 4 will exert a positive torque.

[0053] Embodiment 2

[0054] The second embodiment of the fan head connecting structure is provided, and the difference from the embodiment 1 is that L1 is 29 mm and L2 is 35 mm. The other components and connection relationship are the same as those of the embodiment 1.

[0055] Embodiment 3

[0056] The embodiment provides an electric fan, as shown in the drawings, which comprises a base 60, a support column 61, a fan head 70, a fan blade 62, a mesh cover 63 and the fan head connecting structure of the embodiment 1. The lower end of the support column 61 is connected with the base 60. The lower end of the support arm 1 is connected with the upper end of the support column 601. The support column 61 is a telescopic structure. The fan head 70 is rotationally connected with the shaft sleeve 202. Figures 4-6

[0057] In the embodiment, the fan head 70 comprises a main motor 701, a motor support shaft 702, a motor front baffle 703 and a motor rear cover 704. The main motor 701 comprises a main motor shell, and the motor support shaft 702 is fixedly connected with the main motor shell. The motor front baffle 703 is fixedly connected with the main motor shell, and the motor rear cover 704 is fixedly connected with the motor front baffle 703. The motor support shaft 702 is rotationally connected with the shaft sleeve 202. The bottom of the motor support shaft 702 is provided with a circlip 7021 for preventing the motor support shaft 702 from loosening. The main motor 701 is provided with a motor rotating shaft 7011, and the motor rotating shaft 7011 is fixedly connected with the fan blade 62.

[0058] The fan head 70 further comprises a synchronous motor 705 and a swing head connecting rod 706. The synchronous motor 705 comprises a synchronous motor shell, and the synchronous motor shell is fixedly connected with the main motor shell. The synchronous motor 705 is provided with a rotating shaft cam, one end of the swing head connecting rod 706 is rotationally connected with the rotating shaft cam, and the other end is rotationally connected with the connecting head 2. The fan head 70 further comprises a synchronous motor support 707, one side of the synchronous motor support 707 is fixedly connected with the main motor shell, and the synchronous motor shell is fixedly connected with the synchronous motor support 707.

[0059] The motor rear cover 704 is provided with a swing head switch 708 and a first rotating speed gear switch 709. The swing head switch 708 is electrically connected with the synchronous motor 705. In the embodiment, the first rotating speed gear switch 709 is a rotary knob gear switch, which comprises a rotary knob 7091 and a switch main body 7092, and the switch main body 7092 is electrically connected with the main motor 701.

[0060] The fan mesh cover 63 comprises a front mesh cover 631, a rear mesh cover 632 and a mesh ring 633, and the front mesh cover 631 and the rear mesh cover 632 are fixedly connected through the mesh ring 633. The rear mesh cover 632 is fixedly connected with the motor front baffle 703. The fan blade 62 is located in the space formed by the front mesh cover 631 and the rear mesh cover 632. The mesh ring 633 is provided with a mesh ring decorative cover 634. The mesh ring decorative cover 634 is used for covering the locking structure of the mesh ring 633.

[0061] Embodiment 4

[0062] The embodiment provides a second embodiment of an electric fan, as shown in the drawings, which comprises a base 60, a support column 61, a fan head 70, a fan blade 62, a mesh cover 63 and the fan head connecting structure of the embodiment 1. The lower end of the support column 61 is connected with the base 60. The lower end of the support arm 1 is connected with the upper end of the support column 601. The support column 61 is a telescopic structure. The fan head 70 is rotationally connected with the shaft sleeve 202. Figure 7 ​The difference between the embodiment 3 and the embodiment 4 is that the electric fan further comprises a middle box 64, the middle box 64 is provided with a second rotating speed gear switch 641, the upper end of the middle box 64 is connected with the lower end of the supporting arm 1, the lower end of the middle box 64 is connected with the supporting column 61, the motor rear cover 704 is not provided with the first rotating speed gear switch 709, the lower end of the supporting arm 1 can be sleeved on the upper end of the supporting column 61 and can be sleeved in the upper end of the middle box 64.

[0063] The fan head connecting structure of the electric fan of the embodiment can be directly combined with the supporting column 61 and can be matched with the middle box 64, a plurality of switch control modes can be combined, the electric fan is suitable for a plurality of scene applications, the supporting arm connecting part does not need to be changed, the above scheme is realized without additional cost.

[0064] Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or changes can be made on the basis of the above description. Here, all the embodiments are not enumerated. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A fan head connection structure characterized by comprising: The fan head connecting structure comprises a supporting arm (1) and a connecting head (2), the upper end of the supporting arm (1) is provided with a first groove (101), the two sides of the first groove (101) are respectively provided with an upwardly inclined lug (102), and the lower part of the lug (102) is fixedly connected with the supporting arm (1); The connecting head (2) comprises a rotating part (201) and a shaft sleeve (202) for connecting the fan head, the shaft sleeve (202) is fixedly connected with the rotating part (201), the rotating part (201) is arranged in the first groove (101), and the rotating part (201) is rotationally connected with the lug (102) through a pin shaft (104) and is locked.

2. The fan head connecting structure according to claim 1, wherein the lower part of the supporting arm (1) is cylindrical, the outer diameter of the lower part of the supporting arm (1) is D, the center line of the shaft sleeve (202) is perpendicular to the center line of the rotating shaft of the rotating part (201), the shortest distance between the center line of the shaft sleeve (202) and the center line of the rotating shaft of the rotating part (201) is L1, the center line of the rotating shaft of the rotating part (201) is perpendicular to the center line of the cylinder of the lower part of the supporting arm (1), the shortest distance between the center line of the rotating shaft of the rotating part (201) and the center line of the cylinder of the lower part of the supporting arm (1) is L2, the ratio of L2 to D is within the range of 0.4-0.8, and the ratio of the sum of L1 and L2 to D is within the range of 0.7-1.

3.

3. The fan head connection structure of claim 2, wherein The ratio of L2 to D is 0.47, and the ratio of the sum of L1 and L2 to D is 1.

0.

4. The fan head connection structure of claim 1, wherein The other side of the upper end of the supporting arm (1) is provided with an electric wire cover (103) which is detachably connected with the supporting arm (1), and the electric wire cover (103) is provided with an electric wire opening (1031).

5. The fan head connection structure of claim 4, wherein The electric wire cover (103) comprises a cover body (1032) and a plug-in part (1033) arranged at the lower end of the cover body (1032), the two sides of the plug-in part (1033) are provided with guide flanges (1034), and the supporting arm (1) is provided with guide grooves (1035) matched with the guide flanges (1034).

6. The fan head connection structure of claim 1, wherein The fan head connecting structure further comprises a rotating positioning assembly (3), the rotating positioning assembly (3) comprises a positioning sheet (301), a positioning spring (302) and a positioning ball (303), the positioning sheet (301) is connected with the lug (102), the positioning sheet (301) is provided with a plurality of positioning holes (3013), the rotating part (201) is provided with a containing groove for containing the positioning spring (302) and the positioning ball (303), one end of the positioning spring (302) abuts against the rotating part (201), the other end of the positioning spring (302) abuts against the positioning ball (303), and the positioning ball (303) abuts against the positioning hole (3013).

7. The fan head connection structure of claim 6, wherein The positioning sheet (301) is located between the rotating part (201) and the lug (102), the rotating part (201) and the lug (102) clamp the positioning sheet (301), at least two protrusions (3011) are arranged on the side of the positioning sheet (301) close to the lug (102), the lug (102) is provided with fixed holes (3012) corresponding to the protrusions (3011), and the protrusions (3011) are inserted into the fixed holes (3012).

8. The fan head connection structure according to claim 1 or 6, characterized by The fan head connecting structure further comprises a torsion spring (4), the torsion spring (4) is sleeved on the pin shaft (104), one torsion arm of the torsion spring (4) is connected with the connecting head (2), and the other torsion arm of the torsion spring (4) is connected with the supporting arm (1).

9. An electric fan comprising a base (60), a support column (61), a fan head (70), a fan blade (62) and a net cover (63), characterized in that, The electric fan further comprises the fan head connecting structure in any one of claims 1-8, the fan head (70) is rotationally connected with the shaft sleeve (202), and the lower end of the supporting arm (1) is connected with the supporting column (61).

10. The electric fan according to claim 9, wherein The electric fan further comprises a middle box (64), the middle box (64) is provided with a second rotating speed gear switch (641), the upper end of the middle box (64) is connected with the lower end of the supporting arm (1), and the lower end of the middle box (64) is connected with the supporting column (61).

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