Hidden fan

Abstract

A fan with a hidden head includes a head assembly and a base assembly. The head assembly includes a mesh support, and a motor cavity is disposed inside the mesh support. A drive motor is installed in the motor cavity, and the output shaft of the drive motor can drive the fan blades to rotate. The head assembly is installed on the base assembly, and the vertical line through the center of gravity of the head assembly coincides with the vertical line through the center of gravity of the base assembly. The present invention places the drive motor inside the head assembly and "hides" the drive motor, thereby optimizing the center of gravity of the head assembly, making it on the same vertical line as the center of gravity of the base assembly, and enhancing the overall mechanical stability of the fan. The head assembly has a symmetrical structure and occupies a small space, which improves the overall aesthetic appearance of the fan and gives the fan a unique style.

Description

Technical Field

[0001] The present invention relates to an air conditioning device, and in particular to a fan which accelerates the circulation of surrounding air through driven rotating blades. Background Art

[0002] Prior art fans, such as Fig.11 As shown, the fan head assembly 4 and the support assembly 5 are included. The fan head assembly 4 includes a head 41 in which a driving motor and a swing head assembly are installed, and a fan blade assembly 42 composed of a fan blade connected to the torque output shaft of the driving motor and a mesh cover covering the fan blade. The support assembly 5 includes a base 51 and a support rod 52. Since the fan head assembly 42 is arranged at the front of the head 41, the center of gravity O1 of the fan head assembly 4 is forward. Fig.11 The vertical line Z5Z6 passing through the center of gravity O1 of the fan head assembly 4 is shown. The support assembly 5 has a stable structure, and its center of gravity Q1 is on the support rod 52. Fig.11 The vertical lines Z7 and Z8 are shown passing through the center of gravity Q1 of the support assembly 5. Since the center of gravity O1 of the fan head assembly 4 is closer to the front than the center of gravity Q1 of the support assembly 5, the center of gravity Q2 of the fan as a whole is closer to the front and does not fall on the support rod 52. Fig.11 The vertical line Z3Z4 passing through the center of gravity Q2 of the fan is shown. The support component 5 always bears the forward force, which causes the prior art fan to tend to tip forward and has mechanical stability problems. The prior art fan can only increase the base area to ensure the overall stability of the fan, which increases the space occupied by the fan. In addition, the fan head component 4 is wide in front and narrow in the back, which affects the appearance. Summary of the invention

[0003] The technical problem to be solved by the present invention is to avoid the shortcomings of the prior art and propose a fan that optimizes the center of gravity structure of each component of the fan so that the overall center of gravity of the fan falls on the support rod, improves mechanical stability, enhances space utilization, and has a novel appearance and strong practicality for a hidden head fan.

[0004] The present invention can solve the technical problem by adopting the following technical solutions:

[0005] A fan with a hidden head is designed and manufactured, including a head assembly and a base assembly. The head assembly includes fan blades, a drive motor and a mesh cover group. In particular, the head assembly also includes a mesh ring bracket, and a motor cavity is arranged inside the mesh ring bracket. The drive motor is installed in the motor cavity, and the output shaft of the drive motor can drive the fan blades to rotate. The mesh cover group is connected to the mesh ring bracket and covers the fan blades and the drive motor. The head assembly is installed on the base assembly, and the vertical line passing the center of gravity of the head assembly coincides with the vertical line passing the center of gravity of the base assembly.

[0006] Specifically, the mesh support is tubular, the motor cavity is tubular with an outer diameter smaller than an inner diameter of the mesh support, and the motor cavity is arranged inside the mesh support by means of two or more connecting ribs connecting the outer tube wall of the motor cavity and the inner tube wall of the mesh support.

[0007] The mesh cover group includes two mesh covers and two mesh bundle covers. The mesh cover includes an annular inner fixing ring, an annular outer fixing ring whose diameter is larger than the inner fixing ring, and two or more mesh bundle strips distributed in a divergent shape, whose two ends are respectively fixedly connected to the inner fixing ring and the outer fixing ring. The outer fixing rings of the two mesh covers are respectively buckled and installed on the two pipe openings of the mesh ring bracket, and the mesh bundle covers are respectively sealed and installed on the inner fixing rings of the two mesh covers.

[0008] In order to realize the rotation of the head assembly around the vertical axis, the fan also includes an oscillating head assembly connected between the base assembly and the head assembly; the oscillating head assembly includes an oscillating head base, and a transmission assembly connected between the oscillating head base and the base assembly. The transmission assembly can drive the oscillating head base to rotate relative to the base assembly with the vertical line through the center of gravity of the base assembly as the axis. A bracket joint seat is provided on the outer wall of the mesh ring bracket, and the bracket joint seat is connected to the oscillating head base, so that the head assembly is connected to the oscillating head assembly, and the vertical line through the center of gravity of the head assembly coincides with the vertical line through the center of gravity of the base assembly.

[0009] In order to adjust the pitch angle of the head assembly, the bottom surface of the bracket joint seat is processed into a circular arc surface, and at least one downwardly extending sliding rod is arranged on the bottom surface of the bracket joint seat. The top surface of the shaking head base is processed into a circular arc surface that can adapt to the bottom surface of the bracket joint seat, and the top surface of the shaking head base is processed with a sliding groove for adapting the sliding rod. The sliding rods are respectively inserted into and slidably connected to the sliding grooves adapted to the sliding rods, so that the bracket joint seat can be slidably connected to the shaking head base. When the bracket joint seat slides along the circular arc surface of the top surface of the shaking head base, the pitch angle of the head assembly can be adjusted, and the vertical line through the center of gravity of the head assembly is maintained to coincide with the vertical line through the center of gravity of the base assembly during the sliding process.

[0010] As a solution to achieve maintaining the center of gravity of the head assembly unchanged when adjusting the pitch angle, the cross-sectional arc line of the arc-shaped bottom surface of the bracket joint seat has the center of gravity of the head assembly as the center of the circle, and the cross-sectional arc line is on the longitudinal section of the mesh ring bracket passing through the center of gravity of the head assembly, or is parallel to the longitudinal section of the mesh ring bracket passing through the center of gravity of the head assembly.

[0011] Specifically, the bottom end of the slide bar is provided with a buckle head protruding outward from the rod wall of the slide bar. The slide groove includes two groove walls parallel to each other, and slot baffles arranged at the top of the two groove walls and extending toward each other, so that the width between the two groove walls is greater than the width between the slot baffles. A slide bar disassembly recess groove connected to the slide groove is provided at at least one end of the slide groove, and the width between the two groove walls is not less than the width between the two groove walls of the slide groove. The buckle head of the slide bar is inserted into the slide bar disassembly recess groove and moves into the slide groove. With the help of the slot baffle of the slide groove clamping the slide bar, the buckle head of the slide bar can be buckled and slide in the slide groove, so that the slide bar can be slidably connected to the slide groove.

[0012] In order to realize the reciprocating swing of the head assembly around the vertical axis, a concave chamber is provided at the bottom of the shaking head base, and the transmission assembly includes an eccentric shaft bracket, a shaking head drive motor, an eccentric shaft sleeve, an eccentric wheel and a connecting rod arranged in the concave chamber. The shaking head assembly also includes a baffle plate which covers the concave chamber and has an eccentric through hole processed thereon. The eccentric shaft bracket is fixedly connected to the shaking head base, and an eccentric shaft whose axis deviates from the central axis of the shaking head assembly is provided at the bottom of the eccentric shaft bracket. The shaking head drive motor is fixedly connected to the shaking head base, and the eccentric wheel is fixedly connected to the output shaft of the shaking head drive motor, and the eccentric shaft sleeve is sleeved on the eccentric shaft. The two ends of the connecting rod are respectively connected to the eccentric wheel and the eccentric shaft sleeve, and the bottom end of the eccentric shaft extends out from the eccentric through hole of the baffle plate, and is then fixedly connected to the base assembly.

[0013] For a fan with an oscillating assembly, the base assembly includes a base, a column rod mounted on the base, a column sleeve mounted on the top of the column rod, a front shell connected to the column sleeve, and a rear shell connected to the front shell and encapsulating the column sleeve together with the front shell. The column sleeve can be slidably mounted on the column rod. The bottom end of the eccentric shaft of the oscillating assembly extending from the eccentric through hole of the baffle is fixedly connected to the front shell.

[0014] Specifically, the bottom end of the eccentric shaft of the shaking head assembly is processed with an annular groove, and the eccentric shaft is fixedly connected to the front shell by means of screw fastening, buckle fastening or clamp ring fastening.

[0015] Compared with the prior art, the technical effect of the "fan hidden in the head" of the present invention is:

[0016] The present invention places the drive motor inside the head assembly, "hiding" the drive motor, thereby optimizing the center of gravity of the head assembly, making the center of gravity inside the head assembly, and making the center of gravity of the head assembly and the center of gravity of the base assembly on the same vertical line, thereby enhancing the overall mechanical stability of the fan. The head assembly has a symmetrical structure and occupies a small space, which improves the overall aesthetic appearance of the fan and gives the fan a unique style. Since the vertical line passing the center of gravity of the head assembly coincides with the vertical line passing the center of gravity of the base assembly, the base area can be appropriately reduced compared to the prior art, thereby reducing the space occupied by the fan and improving space utilization. The present invention not only realizes the pitch angle adjustment of the head assembly and the reciprocating swing of the head assembly around the vertical axis, but also ensures that the center of gravity of the head assembly always remains unchanged during the operation, thereby further improving the mechanical stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an axonometric projection of a preferred embodiment of the "fan with hidden head" of the present invention;

[0018] Figure 2 is a schematic diagram of an orthographic projection of all preferred embodiments;

[0019] Figure 3 yes Figure 2 AA cross-sectional view shown;

[0020] Figure 4 is a schematic diagram of an axonometric projection of the preferred embodiment in a decomposed state;

[0021] Figure 5 is a schematic diagram of an axonometric projection of a head assembly 1 in an exploded state of the preferred embodiment;

[0022] Figure 6 is a schematic diagram of an axonometric projection of an exploded state of the shaking head assembly 2 of the preferred embodiment;

[0023] Figure 7 is an axonometric projection diagram of the bracket joint seat 15 and the shaking base 21 of the preferred embodiment;

[0024] Figure 8 is a schematic right view of an orthographic projection of the head assembly 1 of the preferred embodiment when it is in a centered state;

[0025] Fig. 9 is a schematic right-side orthographic projection diagram of the head assembly 1 of the preferred embodiment when it is in a downward position;

[0026] Fig.10 is a schematic right-side orthographic projection diagram of the head assembly 1 of the preferred embodiment when it is in an upward position;

[0027] Fig.11 It is a schematic diagram of the right side view of the orthographic projection of the fan in the prior art. DETAILED DESCRIPTION

[0028] The preferred embodiments are further described below in conjunction with the accompanying drawings.

[0029] The present invention provides a fan with a hidden head, such as Figures 1 to 10 As shown, it includes a head assembly 1 and a base assembly 3. The head assembly includes a fan blade 13, a drive motor 12 and a mesh cover assembly 14. Figure 4 and Figure 5 As shown, the head assembly 1 also includes a mesh ring bracket 11, and a motor cavity 111 is arranged inside the mesh ring bracket 11. The driving motor 12 is installed in the motor cavity 111, and the output shaft of the driving motor 12 can drive the fan blades 13 to rotate. The mesh cover group 14 is connected to the mesh ring bracket 11 and covers the fan blades 13 and the driving motor 12. In most cases, the driving motor 12 is directly connected to the fan blades 13 to drive the fan blades 13 to rotate. The driving motor 12 can also be connected to the fan blades 13 through some transmission mechanisms to drive the fan blades 13 to rotate. Figure 8 As shown, the head assembly 1 is installed on the base assembly 3, and the vertical line passing through the center of gravity O of the head assembly 1 coincides with the vertical line passing through the center of gravity Q of the base assembly 3. The coincident vertical lines are as shown in FIG. Figure 8 The vertical line Z1Z2 is shown. Obviously, the vertical line passing through the center of gravity O of the head assembly 1 refers to the vertical line passing through the center of gravity O of the head assembly 1. Similarly, the vertical line passing through the center of gravity Q of the base assembly 3 refers to the vertical line passing through the center of gravity Q of the base assembly 3. The present invention places the drive motor 12 inside the head assembly 1 and "hides" the drive motor 12, thereby optimizing the center of gravity O of the head assembly 1, making the center of gravity O of the head assembly 1 inside the head assembly 1, and making the center of gravity O of the head assembly 1 and the center of gravity Q of the base assembly 3 on the same vertical line Z1Z2. The base assembly 3 bears all the gravity of the head assembly 1 without horizontal force components, thereby enhancing the overall mechanical stability of the fan. Since the drive motor 12 is built into the head assembly 1, the structure of the head assembly 1 is symmetrical and occupies little space, which improves the overall aesthetic appearance of the fan and gives the fan a unique style.

[0030] The preferred embodiment of the present invention is as follows Figure 4 and Figure 5 As shown, the mesh support 11 is tubular, the motor cavity 111 is tubular with an outer diameter smaller than the inner diameter of the mesh support 11, and the motor cavity 111 is arranged inside the mesh support 11 by means of two or more connecting ribs 112 connecting the outer tube wall of the motor cavity 111 and the inner tube wall of the mesh support 11. In a preferred embodiment of the present invention, the motor cavity 111 is arranged in the middle of the mesh support 11.

[0031] The preferred embodiment of the present invention is as follows Figure 5As shown, the mesh cover group 14 includes two mesh covers 145 and two mesh bundle covers 144. The mesh cover 14 includes an annular inner fixing ring 141, an annular outer fixing ring 142 whose diameter is larger than the inner fixing ring 141, and two or more mesh bundle strips 143 distributed in a divergent shape, which are respectively fixedly connected to the inner fixing ring 141 and the outer fixing ring 142 at both ends. The specific number of the mesh bundle strips 143 should be determined according to the required air volume and safety. The outer fixing rings 142 of the two mesh covers 145 are respectively buckled and installed on the two pipe openings of the mesh ring bracket 11, and the mesh bundle covers 144 are respectively covered and installed on the inner fixing rings 141 of the two mesh covers 145. The mesh cover group 14 covers the pipe openings at both ends of the mesh ring bracket 11 with a symmetrical structure, which is more beautiful and unique than the prior art, and saves the space occupied by the head assembly 1.

[0032] The preferred embodiment of the present invention is as follows Figures 4 to 10 As shown, in order to realize the rotation of the head assembly 1 around the vertical axis, the fan also includes an oscillating assembly 2 connected between the base assembly 3 and the head assembly 1. The oscillating assembly 2 includes an oscillating base 21 and a transmission assembly connected between the oscillating base 21 and the base assembly 3. The transmission assembly can drive the oscillating base 21 to rotate relative to the base assembly 3 with the vertical line passing through the center of gravity Q of the base assembly 3 as the axis. A bracket joint seat 15 is provided on the outer wall of the mesh ring bracket 11, as shown in FIG. Figure 8 As shown, the bracket connector 15 is connected to the oscillating base 21, so that the head assembly 1 is connected to the oscillating assembly 2, and the vertical line passing through the center of gravity O of the head assembly 1 coincides with the vertical line passing through the center of gravity Q of the base assembly 3. It can be seen that when the head assembly 1 rotates around the vertical axis, the center of gravity O of the head assembly 1 remains unchanged to ensure the mechanical stability of the action process. Figure 5 As shown, a connecting seat 16 is provided at the bottom of the mesh ring bracket 11, and the bracket joint seat 15 is connected thereto. The bracket joint seat 15 and the connecting seat 16 can be regarded as an integral structure, or the connecting seat 16 can be used as a receiving structure for the bracket joint seat 15 to be set on the outer wall of the mesh ring bracket 11.

[0033] The preferred embodiment of the present invention is as follows Figures 5 to 7 As shown, the bottom surface 151 of the bracket joint seat 15 is processed into a circular arc surface, and at least one downwardly extending sliding rod 152 is arranged on the bottom surface 151 of the bracket joint seat 15. The top surface 211 of the oscillating base 21 is processed into a circular arc surface that can adapt to the bottom surface of the bracket joint seat 15, and the top surface 211 of the oscillating base 21 is processed with a sliding groove 213 for adapting the sliding rod 152. The sliding rods 152 are respectively inserted into and slidably connected to the sliding grooves 213 adapted to the sliding rods 152, so that the bracket joint seat 15 can be slidably connected to the oscillating base 21, as shown in FIG. Figures 8 to 10As shown, when the bracket joint seat 15 slides along the arc-shaped top surface 211 of the shaking base 21, the pitch angle of the head assembly 1 can be adjusted, and during the sliding process, the vertical line passing through the center of gravity O of the head assembly 1 is kept coincident with the vertical line passing through the center of gravity Q of the base assembly 3. It can be seen that when the head assembly 1 adjusts the pitch angle, the center of gravity O of the head assembly 1 remains unchanged to ensure the mechanical stability of the action process.

[0034] The preferred embodiment of the present invention is as follows Figures 8 to 10 As shown, as a solution to achieve the head assembly 1 to keep its center of gravity O unchanged when adjusting the pitch angle, the cross-sectional arc line R1R2 of the arc-shaped bottom surface 151 of the bracket joint seat 15 takes the center of gravity O of the head assembly 1 as the center of the circle, and the cross-sectional arc line R1R2 is on the longitudinal section P of the mesh ring bracket 11 passing through the center of gravity O of the head assembly 1; or the cross-sectional arc line R1R2 is parallel to the longitudinal section P of the mesh ring bracket 11 passing through the center of gravity O of the head assembly 1. Since the top surface 211 of the shaking base 21 is adapted to the bottom surface 151 of the bracket joint seat 15, the top surface 211 of the shaking base 21 should also have the same cross-sectional arc line R1R2. Figure 8 The head assembly 1 is shown in a centered state. Fig. 9 As stated, when Figure 8 In the state shown, the head assembly 1 is adjusted along the direction of arrow J1, and with the help of the bottom surface 151 of the bracket joint seat 15 and the top surface 211 of the shaking base 21 that are adapted to each other and can slide relatively, the head assembly 1 is bent down at an angle, which is the angle between the longitudinal center line P3P4 perpendicular to the axis P1P2 of the fan blade 13 and the vertical line Z1Z2 passing through the center of gravity O of the head assembly 1. Since the center of the cross-section arc line R1R2 is the center of gravity O of the head assembly 1, the center of gravity O of the head assembly 1 remains unchanged during the process of bending down the head assembly 1 to ensure the mechanical stability of the action process. Fig.10 As stated, when Figure 8 In the state shown, the head assembly 1 is adjusted along the direction of arrow J2, and with the help of the bottom surface 151 of the bracket joint seat 15 and the top surface 211 of the shaking base 21 that are adapted to each other and can slide relatively, the head assembly 1 is tilted up to an angle, which is the angle between the longitudinal center line P3P4 perpendicular to the axis P1P2 of the fan blade 13 and the vertical line Z1Z2 passing through the center of gravity O of the head assembly 1. Since the center of the cross-section arc line R1R2 is the center of gravity O of the head assembly 1, the center of gravity O of the head assembly 1 remains unchanged during the tilting process of the head assembly 1 to ensure the mechanical stability of the action process.

[0035] In summary, the present invention not only realizes the pitch angle adjustment of the head assembly and the reciprocating swing of the head assembly around the vertical axis, but also ensures that the center of gravity of the head assembly always remains stationary during the operation, thereby further improving the mechanical stability.

[0036] Since the vertical line Z1Z2 through the center of gravity O of the head assembly 1 coincides with the vertical line Z1Z2 through the center of gravity Q of the base assembly 3, the base area can be appropriately reduced compared with the prior art, thereby reducing the space occupied by the fan and improving space utilization.

[0037] The preferred embodiment of the present invention is as follows Figure 7 As shown, in order to realize that the slide bar 152 can be slidably connected to the slide groove 213 adapted to the slide bar 152 and prevent the slide bar 152 from falling out of the slide groove 213, the bottom end of the slide bar 152 is provided with a buckle head 153 protruding outward from the rod wall of the slide bar 152, so that the slide bar 152 has a structure with a large head and a small neck. The slide groove 213 includes two groove vertical walls parallel to each other, and a groove baffle 215 provided on the top of the two groove vertical walls and extending toward each other. Due to being blocked by the groove baffle 215, the groove vertical walls are Figure 7 It cannot be seen in the figure, but it should be a structure that is easy to think of. The structure of the slot baffle 215 makes the width between the two slot walls larger than the width between the slot baffles 215. A slide bar disassembly recess 214 is provided at at least one end of the slide slot 213, which is connected to the slide slot and has a width between the two slot walls that is not less than the width between the two slot walls of the slide slot. The buckle head 153 of the slide bar 152 is inserted into the slide bar disassembly recess 214 and moves into the slide slot 213. With the help of the slot baffle 215 of the slide slot 213 that clamps the slide bar 152, the buckle head 153 of the slide bar 152 can be buckled and slide in the slide slot 213, so that the slide bar 152 can be slidably connected to the slide slot 213.

[0038] The preferred embodiment of the present invention is as follows Figure 6 As shown, in order to realize the reciprocating swing of the head assembly 1 around the vertical axis, the bottom of the oscillating base 21 is provided with an inner concave chamber, and the transmission assembly includes an eccentric shaft bracket 22, an oscillating drive motor 23, an eccentric shaft sleeve 24, an eccentric wheel 25 and a connecting rod 26 arranged in the inner concave chamber. The oscillating assembly 2 also includes a baffle 27 that covers the inner concave chamber and has an eccentric through hole 271 processed thereon. The eccentric shaft bracket 22 is fixedly connected to the oscillating base 21, and an eccentric shaft 221 whose axis deviates from the central axis of the oscillating assembly 2 is provided at the bottom of the eccentric shaft bracket 22. The oscillating drive motor 23 is fixedly connected to the oscillating base 21, and the eccentric wheel 25 is fixedly connected to the output shaft of the oscillating drive motor 23, and the eccentric shaft sleeve 24 is sleeved on the eccentric shaft 221. The two ends of the connecting rod 26 are respectively connected to the eccentric wheel 25 and the eccentric shaft sleeve 24, and the bottom end of the eccentric shaft 221 extends from the eccentric through hole 271 of the baffle 27, and is then fixedly connected to the base assembly 3. The eccentric shaft 221 is driven to move along an arc path by means of the oscillating drive motor 23, and the eccentric shaft 221 is reciprocated between the end points of the path by means of the eccentric wheel 25 and the connecting rod 26, thereby realizing the reciprocating rotation of the head assembly 1 connected to the oscillating base 21.

[0039] The preferred embodiment of the present invention is as follows Figure 4 As shown, the base assembly 3 includes a base 31, a column rod 32 mounted on the base 31, a column sleeve 33 sleeved on the top of the column rod 32, a front shell 34 connected to the column sleeve 33, and a rear shell 35 connected to the front shell 34 and encapsulating the column sleeve 33 together with the front shell 34. The column sleeve 33 can be slidably sleeved on the column rod 32, and the height of the fan can be adjusted by adjusting the position of the column sleeve 33 on the column rod 32. The bottom end of the eccentric shaft 221 of the oscillating assembly 2 extending from the eccentric through hole 271 of the baffle 27 is fixedly connected to the front shell 34.

[0040] The preferred embodiment of the present invention is as follows Figure 6 As shown, the bottom end of the eccentric shaft 221 of the shaking head assembly 2 is processed with an annular groove 222, by means of which the eccentric shaft 221 is fixedly connected to the front shell 34 by means of screw fastening, buckle fastening or snap ring fastening.

[0041] Referring to the preferred embodiment of the present invention, for a fan without an oscillating head assembly 2, the base assembly 3 should include a base 31, and a column rod 32 installed on the base 31 for connecting to the head assembly 1, thereby realizing the connection between the base assembly 3 and the head assembly 1.

Claims

1. A fan with a hidden head, comprising a head assembly and a base assembly; the head assembly comprises fan blades, a drive motor and a mesh cover assembly; the characteristics are: The head assembly also includes a mesh ring bracket, and a motor cavity is arranged inside the mesh ring bracket; The driving motor is installed in the motor cavity, the output shaft of the driving motor can drive the fan blades to rotate, and the mesh cover group is connected to the mesh ring bracket to cover the fan blades and the driving motor; The head assembly is installed on the base assembly, and the vertical line through the center of gravity of the head assembly coincides with the vertical line through the center of gravity of the base assembly; It also includes an oscillating head assembly connected between the base assembly and the head assembly; the oscillating head assembly includes an oscillating head base, and a transmission assembly connected between the oscillating head base and the base assembly; the transmission assembly can drive the oscillating head base to rotate relative to the base assembly with the vertical line passing through the center of gravity of the base assembly as the axis; A bracket joint seat is arranged on the outer wall of the mesh ring bracket, and the bracket joint seat is connected to the shaking head base, so that the head assembly is connected to the shaking head assembly, and the vertical line through the center of gravity of the head assembly coincides with the vertical line through the center of gravity of the base assembly; The bottom surface of the bracket joint seat is processed into an arc surface, and at least one sliding rod extending downward is arranged on the bottom surface of the bracket joint seat; The top surface of the shaking head base is processed into an arc surface that can adapt to the bottom surface of the bracket joint seat, and the top surface of the shaking head base is processed with a sliding groove for adapting the sliding rod; the sliding rods are respectively inserted into and slidably connected to the sliding grooves adapted to the sliding rods, so that the bracket joint seat can be slidably connected to the shaking head base. When the bracket joint seat slides along the arc-shaped top surface of the shaking head base, the pitch angle of the head assembly can be adjusted, and during the sliding process, the vertical line through the center of gravity of the head assembly is maintained to coincide with the vertical line through the center of gravity of the base assembly.

2. The fan with hidden head according to claim 1, characterized in that: The mesh support is tubular, the motor cavity is tubular with an outer diameter smaller than an inner diameter of the mesh support, and the motor cavity is arranged inside the mesh support by means of two or more connecting ribs connecting the outer tube wall of the motor cavity and the inner tube wall of the mesh support.

3. The fan with hidden head according to claim 2, characterized in that: The mesh cover group includes two mesh covers and two mesh bundle covers; The mesh cover comprises an annular inner fixing ring, an annular outer fixing ring whose diameter is larger than that of the inner fixing ring, and two or more mesh bundle strips which are respectively fixedly connected to the inner fixing ring and the outer fixing ring at both ends and are distributed in a divergent shape; The outer fixing rings of the two net covers are respectively buckled and installed on the two pipe openings of the net ring bracket, and the net bundle cover is respectively sealed and installed on the inner fixing rings of the two net covers.

4. The fan with hidden head according to claim 1, characterized in that: The cross-sectional arc line of the arc-shaped bottom surface of the bracket joint seat has the center of gravity of the head assembly as the center of the circle, and the cross-sectional arc line is on the longitudinal section of the mesh ring bracket passing through the center of gravity of the head assembly, or is parallel to the longitudinal section of the mesh ring bracket passing through the center of gravity of the head assembly.

5. The fan with hidden head according to claim 1, characterized in that: The bottom end of the slide bar is provided with a buckle head protruding outward of the rod wall of the slide bar; The slideway comprises two parallel groove walls and groove baffles arranged on the tops of the two groove walls and extending toward each other, so that the width between the two groove walls is greater than the width between the groove baffles; a slide rod disassembly recess groove is arranged at at least one end of the slideway, which is connected to the slideway and has a width between the two groove walls that is not less than the width between the two groove walls of the slideway; The buckle head of the slide bar is inserted into the slide bar disassembly and assembly concave groove and moves into the slide groove. With the help of the notch baffle of the slide groove clamping the slide bar, the buckle head of the slide bar can be buckled and slide in the slide groove, so that the slide bar can be slidably connected to the slide groove.

6. The fan with hidden head according to claim 1, characterized in that: The bottom of the oscillating base is provided with an inner concave chamber, and the transmission assembly includes an eccentric shaft support, an oscillating drive motor, an eccentric shaft sleeve, an eccentric wheel and a connecting rod arranged in the inner concave chamber; the oscillating assembly also includes a baffle plate covering the inner concave chamber and having an eccentric through hole processed thereon; The eccentric shaft bracket is fixedly connected to the oscillating head base, and an eccentric shaft whose axis deviates from the central axis of the oscillating head assembly is arranged at the bottom of the eccentric shaft bracket; The shaking head drive motor is fixedly connected to the shaking head base, and the output shaft of the shaking head drive motor is fixedly connected to the eccentric wheel. The eccentric shaft sleeve is sleeved on the eccentric shaft, and the two ends of the connecting rod are respectively connected to the eccentric wheel and the eccentric shaft sleeve. The bottom end of the eccentric shaft extends out from the eccentric through hole of the baffle, and is then fixedly connected to the base assembly.

7. The fan with hidden head according to claim 6, characterized in that: The base assembly includes a base, a column rod mounted on the base, a column sleeve mounted on the top of the column rod, a front shell connected to the column sleeve, and a rear shell connected to the front shell and encapsulating the column sleeve together with the front shell; the column sleeve can be slidably mounted on the column rod; The bottom end of the eccentric shaft of the oscillating assembly extending from the eccentric through hole of the baffle is fixedly connected to the front shell.

8. The fan with hidden head according to claim 6, characterized in that: The bottom end of the eccentric shaft of the shaking head assembly is processed with an annular groove, by means of which the eccentric shaft is fixedly connected to the front shell by means of screw fastening, buckle fastening or clamp ring fastening.

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