A vehicle-mounted fan with an anti-drop installation structure

Abstract

The present invention discloses a vehicle-mounted fan with an anti-drop installation structure, comprising a structural tube; an outer tube, the outer tube is slidably connected in the structural tube; an inner tube, the inner tube is rotatably connected in the outer tube; an elastic plate, the elastic plate is arranged on the outer tube; an outer convex oblique block, the outer convex oblique block is arranged on the outer wall of the inner tube; a support arm, one end of the support arm is rotatably connected to the outside of the structural tube, and the other end is rotatably connected to a fan; the outer wall of the structural tube is rotatably connected to a lower swivel, the lower swivel can be selectively connected to the inner tube in a transmission manner; the support arm can selectively limit the rotation of the lower swivel. It occupies a small space, can prevent the vehicle from falling off due to bumps and vibrations; and is easy to store. The upper swivel and the lower swivel are easy to hold and operate; and at the same time, it also prevents the upper swivel from loosening due to the bumps and vibrations of the vehicle. The metal plate can prevent the lower swivel from rotating, so that the driven column and the driving groove remain facing each other, which is convenient for the next deployment and use.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle accessories, and in particular relates to a vehicle-mounted fan with an anti-drop installation structure. Background Art

[0002] Although most vehicles are equipped with air conditioning, car fans are still widely used in cars. On the one hand, they can solve the problem of local air blockage and improve uneven airflow distribution; on the other hand, they can also reduce vehicle energy consumption and meet the temperature requirements of different body sensations. At present, car fans are generally installed on the center console, but due to factors such as vehicle bumps and vibrations, there is a risk of falling; there are also installations on the center console, but this will block the field of vision and increase the blind spot during driving.

[0003] The Chinese patent document with publication number CN221757403U discloses a flexible and rotatable vehicle-mounted multifunctional cup holder, which includes a base, a cup barrel connected to the top of the base, a connecting platform extending outward on one side of the upper end of the cup barrel, a rotating platform in a long strip shape is rotatably connected to the top of the connecting platform, a cup ring is installed between the connecting platform and the rotating platform, and a support rod extending up and down is provided at one end of the top of the rotating platform, a ball head rod which is rotatably matched with the support rod is inserted from top to bottom at the upper end of the support rod, and a universal ball head is provided at the upper end of the ball head rod, and a mobile phone holder is connected to the universal ball head. The ball head rod can rotate 360 ​​degrees in the horizontal direction, and can flexibly adjust the position of the mobile phone holder in conjunction with the universal ball head, and the setting of the O-ring makes the ball head rod have a damping effect when rotating.

[0004] The above patent solution provides a fixing solution for a mobile phone holder, which can be used to install a car fan. Although it can avoid the risk of falling and the creation of blind spots, there are two problems with the above patent solution: 1. The installation base is filled with the cup holder in the car for fixing. Although a new cup holder is re-set on the installation base, it makes the overall volume and height larger. In the limited space inside the car, it is not only inconvenient for the movement of the driver and passengers, but also causes a large obstruction to the operating keys on the console. In particular, many vehicles have two cup holders set adjacent to each other, which also causes the problem that the other cup holder cannot be used because the upper space is occupied. 2. Car fans are different from mobile phone holders. Car fans are seasonal products. When not in use, they should be stored. The above patent solution is obviously not convenient for storage due to its large volume and height. Therefore, even after certain design modifications, the above patent solution still cannot meet the use needs of car fans. Summary of the invention

[0005] In order to overcome the technical problems that the vehicle fan installed on the center console in the prior art may fall off or increase the blind spot during driving, and that the fan installed in the cup holder may occupy a large space and be inconvenient to store. One object of the present invention is to provide a vehicle fan with an anti-falling installation structure, in which a retractable inner tube and an outer tube are arranged in the structural tube, and the rotation of the inner tube causes the elastic plate on the outer tube to protrude outward and press against the cup holder to achieve fixation, thus only occupying a small part of the volume of the cup holder, and still being able to place bottled water or cups of corresponding size. At the same time, after being folded and contracted, the fan occupies a small space and is convenient to be stored in the vehicle.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a vehicle-mounted fan with an anti-drop mounting structure, comprising a structural tube; an outer tube, the outer tube is axially slidably connected to the structural tube; an inner tube, the inner tube is rotatably connected to the outer tube; an elastic plate, the elastic plate is arranged on the outer wall of the outer tube; an outer convex bevel block, the outer convex bevel block is arranged on the outer wall of the inner tube, and the outer convex bevel block is used to drive the elastic plate to protrude toward the periphery; a support arm, one end of the support arm is rotatably connected to the outside of the structural tube, and the other end is rotatably connected to the fan; wherein, the outer wall of the structural tube is rotatably connected to a lower swivel, and the lower swivel can be selectively connected to the inner tube in a transmission manner; the support arm can selectively limit the rotation of the lower swivel.

[0007] Due to the differences in brands and models, the shape, diameter and depth of car cup holders are also different. The country has not set a unified standard for this. The generally used round structure is 7-8cm in diameter. The commonly used mineral water bottles, such as large bottles of mineral water with a capacity of 500ml or 550ml, generally have an outer diameter of 6.4cm. Therefore, when the mineral water is placed in the cup holder, the gap is between 0.6-1.6cm. The main space occupied by the solution extending into the cup holder comes from the wall thickness of the inner tube and the outer tube. For the minimum gap of 0.6mm, the support strength provided by the sum of the wall thickness of the inner tube and the outer tube is sufficient to provide a stable installation foundation for the fan.

[0008] In addition, the inner tube and the outer tube can be completely stored in the structural tube, and the support arm and the fan can be folded, thereby reducing the occupied volume after the overall storage.

[0009] Furthermore, it includes a driven column, which is arranged on the upper part of the outer wall of the inner tube and passes through the outer tube; a driving groove, which is arranged on the inner wall of the lower rotating ring, and the driven column can be selectively located in the driving groove; wherein a magnet is arranged in the driving groove; a metal plate is arranged on the outer tube, and the lower end of the metal plate is rotatably connected to the outer tube; the metal plate can be selectively magnetically attracted by the magnet and rotated into the driving groove.

[0010] When the inner tube and the outer tube are retracted into the structural tube, the magnet and the metal plate are facing each other, and the metal plate is magnetically attracted by the magnet to enter the driving groove, thereby limiting the rotation of the lower rotating ring. This facilitates the next use, so that the driven column can accurately enter the driving groove, and at the same time, it also prevents the inner tube and the outer tube from escaping from the structural tube. When used next time, the inner tube and the outer tube apply thrust, and the metal plate can overcome the magnetic force and rotate to its original position.

[0011] Furthermore, it includes a lower ratchet ring, which is coaxially arranged on the upper end of the outer wall of the lower swivel; an upper ratchet ring, which is axially slidably connected to the outside of the structural tube, and the upper ratchet ring is selectively connected to the lower ratchet ring in a one-way transmission manner; a first spring, which is arranged between the upper ratchet ring and the structural tube, and the elastic force of the first spring is used to make the upper ratchet ring slide toward the lower ratchet ring; wherein the outer wall of the structural tube is axially slidably connected with an upper swivel, and the upper swivel is used to drive the upper ratchet ring to slide in a direction away from the lower ratchet ring; one end of the support arm is rotatably connected to the outer wall of the upper swivel.

[0012] When the lower swivel ring rotates to drive the elastic plate to bulge outward, the lower ratchet ring rotates unidirectionally relative to the upper ratchet ring until the elastic plate is pressed against the inner wall of the cup holder. When facing vehicle vibration and bumps, the lower swivel ring can be prevented from rotating in the opposite direction and loosening, thereby ensuring the installation strength of the vehicle fan.

[0013] Specifically, it includes an annular groove, which is coaxially arranged on the outer wall of the structural tube; a limit plate, which is horizontally slidably connected to the upper rotating ring, and the limit plate can be selectively located in the annular groove; a slot, which is arranged on the outer wall of the structural tube and has a plurality of slots evenly distributed along the circumferential direction; a limit rod, which is horizontally slidably connected to the upper rotating ring, and the limit rod can be selectively located in the slot and slide longitudinally; wherein the support arm is transmission-connected to the limit plate and the limit rod.

[0014] Specifically, it includes a first notch, which is arranged on the limit plate; a second notch, which is arranged on the limit rod; a lever, the middle part of which is rotatably connected to the upper rotating ring, and the two ends of the lever are respectively located in the first notch and the second notch; a second spring, which is arranged between the limit plate and the upper rotating ring, and the elastic force of the second spring is used to make the limit plate slide into the annular groove; wherein an axial convex strip is arranged at one end of the support arm close to the upper rotating ring; the axial convex strip can selectively drive the limit plate to slide in the direction away from the annular groove.

[0015] When the limit plate is located in the annular groove, the upper rotating ring drives the fan to rotate relatively to adjust the wind direction of the fan. The upper rotating ring cannot slide longitudinally, and the upper ratchet ring keeps the limit on the lower ratchet ring, thereby ensuring the stability of the installation.

[0016] When the limiting plug rod is located in the slot, the upper swivel ring and the structural tube cannot rotate relative to each other. During installation, the upper swivel ring and the lower swivel ring are held and rotated. Even if the thickness of the structural tube is relatively low, they can be easily rotated for installation. At the same time, the upper swivel ring can also slide longitudinally to drive the upper ratchet ring and the lower ratchet ring to separate and realize disassembly.

[0017] Specifically, a linkage groove penetrating the outer tube is arranged at the upper portion of the outer tube; the linkage groove is arranged along the circumference of the outer tube; and the driven column passes through the linkage groove.

[0018] Specifically, a through groove is axially arranged on the tube wall of the structural tube, and the driven column is located in the through groove; a circumferential groove is circumferentially arranged on the tube wall of the structural tube, and the circumferential groove is located at the lower end of the through groove; two spaced-apart protrusions are arranged on the inner wall of the lower rotating ring, and the driving groove is formed between the two protrusions; the protrusion is located in the through groove.

[0019] Furthermore, a penetrating rectangular groove is provided on the tube wall of the outer tube; one end of the elastic plate is provided at one end of the rectangular groove; the outwardly convex inclined block is located in the rectangular groove; and an inclined surface is provided at one end of the outwardly convex inclined block facing the elastic plate.

[0020] Specifically, the inner wall of the upper ratchet ring is provided with a plurality of sliding blocks evenly distributed along the circumferential direction; the outer wall of the structural tube is provided with a plurality of guide grooves arranged along the axial direction; and the sliding blocks are located in the guide grooves.

[0021] Specifically, an outer convex edge is coaxially arranged on the outer wall of the upper ratchet ring; an inner groove is arranged on the inner wall of the upper rotating ring; and the outer convex edge is rotatably connected in the inner groove.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention occupies little space, and the corresponding cup holder and the adjacent cup holder can be used normally, and will not block the operation keys of the central control panel and the activity space of the driver and passengers; the elastic plate is propped up and pressed tightly in the cup holder so that the whole is stably fixed in the cup holder, which can prevent the cup holder from falling off due to the bumps and vibrations of the vehicle; in addition, the inner tube and the outer tube can be put into the structural tube, and the overall volume is further reduced, which is convenient for storage.

[0024] 2. When the arm is in the folded state, the upper swivel and the lower swivel are installed by relative rotation, and the upper swivel is disassembled by longitudinal sliding. Even if the thickness of the structural tube is small, the upper swivel and the lower swivel are easy to hold and operate; when the arm is in the unfolded state, the upper swivel can only rotate in a circle to adjust the wind direction and position of the fan. At the same time, it also prevents the upper swivel from longitudinally jumping due to the bumps and vibrations of the vehicle, and avoids the upper ratchet ring from accidentally disengaging and causing the outer tube to become loose.

[0025] 3. When the inner tube and the outer tube are put into the structural tube, the metal plate is magnetically sucked into the driving groove, which can prevent the lower swivel from rotating and keep the driven column and the driving groove aligned, which is convenient for the next deployment and use; it can also prevent the inner tube and the outer tube from sliding out of the structural tube, making it easy to store and organize. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention in the use and installation state;

[0027] Figure 2 It is a schematic diagram of the exploded parts of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the structural tube of the present invention;

[0029] Figure 4 It is a schematic structural diagram of the limiting plate and the limiting rod of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the inner tube, outer tube and lower swivel of the present invention;

[0031] Figure 6 It is a schematic diagram of the cross-sectional structure of the present invention in the use and installation state;

[0032] Figure 7 It is a schematic diagram of the present invention in a folded storage state;

[0033] Figure 8 It is a schematic diagram of the cross-sectional structure of the present invention in a folded and stored state.

[0034] In the figure: 1. structural tube; 11. annular groove; 12. slot; 13. guide groove; 14. through groove; 15. circumferential groove; 2. outer tube; 21. elastic plate; 22. linkage groove; 23. guide column; 24. metal plate; 3. inner tube; 31. external convex inclined block; 32. driven column; 4. upper rotating ring; 41. inner groove; 5. lower rotating ring; 51. lower ratchet ring; 52. driving groove; 53. magnet; 61. upper ratchet ring; 611. slider; 612. external convex eaves; 62. first spring; 71. limit plate; 711. first notch; 712. abutment strip; 72. limit rod; 721. second notch; 73. lever; 74. second spring; 81. support arm; 811. axial convex strip; 82. fan; 91. cup holder. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0036] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise specified and limited, the terms "setting", "installation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] See also Figure 1-Figure 8A vehicle-mounted fan with an anti-drop installation structure comprises an upper rotating ring 4, a lower rotating ring 5, a structural tube 1, an outer tube 2, and an inner tube 3 which are coaxially arranged from outside to inside, wherein the upper rotating ring 4 is located at the upper end of the lower rotating ring 5; an arm 81 is arranged on the outer wall of the upper rotating ring 4, one end of which is rotatably connected to the upper rotating ring 4, and the other end of which is rotatably connected to a fan 82. The rotation process of both ends of the arm 81 has damping, so that the arm 81 and the fan 82 can remain stationary at any position.

[0040] The outer tube 2 is provided with three rectangular grooves evenly distributed along the circumferential direction and penetrating the outer tube 2 on its wall; an elastic plate 21 is provided at one end of the rectangular groove; three convex inclined blocks 31 evenly distributed along the circumferential direction are provided on the outer wall of the inner tube 3; the convex inclined blocks 31 are located in the rectangular groove; an inclined surface is provided at one end of the convex inclined block 31 toward the elastic plate 21; the inclined surface can selectively drive the end of the elastic plate 21 to make it tilt toward the periphery.

[0041] The upper end of the outer wall of the outer tube 2 is provided with three guide columns 23 evenly distributed in the circumferential direction; the guide columns 23 are axially slidably connected in the structural tube 1; the upper end of the outer wall of the inner tube 3 is provided with three driven columns 32 evenly distributed in the circumferential direction; the upper end of the outer wall of the outer tube 2 is provided with three linkage grooves 22 evenly distributed in the circumferential direction and penetrating the outer tube 2; the driven columns 32 are located in the linkage grooves 22 and pass through them to the periphery.

[0042] The lower rotating ring 5 is rotatably connected to the outer circumference of the structural tube 1; the inner wall of the lower rotating ring 5 is provided with three pairs of protrusions evenly distributed in the circumferential direction, and a driving groove 52 is formed between two adjacent protrusions; the tube wall of the structural tube 1 is provided with three through grooves 14 evenly distributed in the circumferential direction and arranged along the axial direction of the structural tube 1, and the driven column 32 is slidably connected in the through groove 14 along the axial direction; the tube wall of the structural tube is provided with three circumferential grooves 15 evenly distributed in the circumferential direction and arranged in the circumferential direction, and the circumferential groove 15 is located at the lower end of the through groove 14; the protrusion is slidably connected in the through groove 14;

[0043] A magnet 53 is provided in the driving groove 52; a metal plate 24 is provided on the outer tube 2, and the lower end is rotatably connected to the outer tube 2; when the inner tube 3 and the outer tube 2 are located in the structural tube 1, the metal plate 24 is magnetically attracted by the magnet 53 and rotates into the driving groove 52; when the inner tube 3 and the outer tube 2 extend out of the structural tube 1, the driven column 32 enters into the driving groove 52.

[0044] A lower ratchet ring 51 is coaxially arranged at the upper end of the lower rotating ring 5; an upper ratchet ring 61 is axially slidably connected to the outer wall of the structural tube 1; a first spring 62 is arranged between the upper ratchet ring 61 and the structural tube 1; the elastic force of the first spring 62 is used to make the upper ratchet ring 61 slide toward the lower ratchet ring 51; three sliders 611 uniformly distributed along the circumferential direction are arranged on the inner wall of the upper ratchet ring 61; three guide grooves 13 uniformly distributed along the circumferential direction and arranged along the axial direction of the structural tube 1 are arranged on the outer wall of the structural tube 1; the slider 611 is located in the guide groove 13.

[0045] The upper rotating ring 4 is rotatably connected to the outer periphery of the structural tube 1; the outer wall of the upper ratchet ring 61 is coaxially provided with an outer convex 612; the inner wall of the upper rotating ring 4 is provided with an inner groove 41; the outer convex 612 is rotatably connected in the inner groove 41; the thickness of the outer convex 612 is equal to the width of the inner groove 41.

[0046] An annular groove 11 is coaxially arranged on the upper part of the outer wall of the structural tube 1; a plurality of slots 12 uniformly distributed in the circumferential direction and arranged in the axial direction are arranged on the upper part of the outer wall of the structural tube 1; a boss is arranged on the outer wall of the upper rotating ring; the upper end of the boss is connected to a limit plate 71 along the radial sliding connection of the upper rotating ring 4; the upper end of the boss is connected to two limit rods 72 along the radial sliding connection of the upper rotating ring 4; the limit plate 71 is located between the two limit rods 72; the upper end of the boss is located between the limit plate 71 and the limit rod 72, and a lever 73 rotatably connected to the boss in the middle is provided.

[0047] The limiting plate 71 is provided with a first notch 711 on one side facing the two limiting rods 72 ; the limiting rod 72 is provided with a second notch 721 ; and both ends of the lever 73 are located in the first notch 711 and the second notch 721 , respectively.

[0048] A second spring 74 is provided between the limit plate 71 and the boss for making the limit plate 71 slide in the direction of the annular groove 11; an abutment strip 712 is provided at the upper end of the limit plate 71; the support arm 81 is rotatably connected to the boss; an axial convex strip 811 is provided on the support arm 81 for driving the abutment strip 712 to slide.

[0049] Use process: Pull the outer tube 2 and the inner tube 3 out of the structural tube 1, the metal plate 24 overcomes the magnetic attraction of the magnet 53 and rotates inward until it is separated from the driving groove 52, and then the driven column 32 enters the driving groove 52. At this time, the limit rod 72 is located in the slot 12 and can slide axially. Insert the outer tube 2 and the inner tube 3 into the cup holder 91, rotate the upper rotating ring 4 and the lower rotating ring 5 in the opposite direction, and the lower rotating ring 5 rotates forward relative to the structural tube 1, so that the driving groove 52 drives the driven column 32 to rotate and then the inner tube 3 rotates relative to the outer tube 2. The convex inclined block 31 on the inner tube 3 drives the elastic plate 21 to protrude outward, and then it is tightly pressed against the inner wall of the cup holder 91 to achieve fixation. The upper ratchet ring 61 is pressed against the lower ratchet ring 51 on the lower rotating ring 5 under the elastic force of the first spring 62, limiting the reverse rotation of the lower rotating ring 5.

[0050] Next, the arm 81 is rotated upward to separate the axial protrusion 811 from the abutment strip 712. The limit plate 71 slides and is inserted into the annular groove 11 under the elastic force of the second spring 74. At the same time, the limit plate 71 slides and drives the lever 73 to rotate. The lever 73 rotates and drives the limit rod 71 to slide out of the slot 12. At this time, the upper rotating ring 4 can only rotate in the circumferential direction. The upper rotating ring 4 and the fan 82 are rotated to adjust the wind direction. The upper rotating ring 4 cannot slide upward to prevent the vehicle from vibrating and jumping upward to cause the upper ratchet ring 61 to separate from the lower ratchet ring 51, thereby preventing the elastic plate 21 from loosening with the cup holder 91 (such as Figure 6 as shown).

[0051] When disassembling, rotate the folding support arm 81 and the fan 82 so that they are placed horizontally above the structural tube 1. The rotation of the support arm 81 drives the axial protrusion 811 to rotate, and then the axial protrusion 811 drives the abutment bar 712 to slide, the limit plate 71 slides away from the annular groove 11, and the limit rod 72 enters the slot 12. Lift the upper rotating ring 4, so that the inner groove 41 drives the outer convex rim 612 to slide upward, and then the upper ratchet ring 61 is separated from the lower ratchet ring 51. Then rotate the lower rotating ring 5 in the opposite direction to the extreme position, the outer convex inclined block 31 is no longer in contact with the elastic plate 21, and the elastic plate 21 is no longer tightly against the cup holder 91, and then the inner tube 3 and the outer tube 2 are pulled out of the cup holder 91.

[0052] Finally, the inner tube 3 and the outer tube 2 are put into the structural tube 1, the metal plate 24 is opposite to the magnet 53, and the metal plate 24 is magnetically attracted and rotated into the driving groove 52, which restricts the rotation of the lower rotating ring 5 and restricts the inner tube 3 and the outer tube 2 from sliding out of the structural tube 1, so that the driven column 32 and the driving groove 52 remain opposite to each other, which is convenient for the next deployment (such as Figure 8 as shown).

[0053] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are included in the patent scope of the present invention.

Claims

1. A vehicle-mounted fan with an anti-drop installation structure, characterized in that: It comprises a structural tube; an outer tube, wherein the outer tube is axially slidably connected inside the structural tube; an inner tube, the inner tube being rotatably connected inside the outer tube; An elastic plate, the elastic plate being arranged on the outer wall of the outer tube; An externally convex oblique block, which is arranged on the outer wall of the inner tube and is used to drive the elastic plate to bulge outward; A support arm, one end of which is rotatably connected to the outside of the structural tube, and the other end of which is rotatably connected to a fan; wherein the outer wall of the structural tube is rotatably connected to a lower swivel, and the lower swivel can be selectively connected to the inner tube in a transmission manner; Also includes A driven column, the driven column is arranged on the upper part of the outer wall of the inner tube, and the driven column passes through the outer tube; A driving groove, the driving groove is arranged on the inner wall of the lower rotating ring, and the driven column can be selectively located in the driving groove; Wherein, a magnet is arranged in the driving groove; a metal plate is arranged on the outer tube, and the lower end of the metal plate is rotatably connected to the outer tube; the metal plate can be selectively attracted by the magnet and rotated into the driving groove.

2. The vehicle-mounted fan according to claim 1, characterized in that: Included A lower ratchet ring, the lower ratchet ring being coaxially arranged on an upper end of an outer wall of the lower rotating ring; An upper ratchet ring, the upper ratchet ring is axially slidably connected to the outside of the structural tube, and the upper ratchet ring can be selectively connected to the lower ratchet ring in a one-way transmission manner; a first spring, wherein the first spring is disposed between the upper ratchet ring and the structural tube, and wherein the elastic force of the first spring is used to make the upper ratchet ring slide toward the lower ratchet ring; The outer wall of the structural tube is axially slidably connected with an upper rotating ring, and the upper rotating ring is used to drive the upper ratchet ring to slide in a direction away from the lower ratchet ring; one end of the support arm is rotatably connected to the outer wall of the upper rotating ring.

3. The vehicle-mounted fan according to claim 2, characterized in that: Included an annular groove, the annular groove being coaxially arranged on the outer wall of the structural tube; A limit plate, the limit plate is horizontally slidably connected to the upper rotating ring, and the limit plate can be selectively located in the annular groove; A slot, wherein the slot is arranged on the outer wall of the structural tube and has a plurality of slots evenly distributed along the circumferential direction; A limit rod, the limit rod being horizontally slidably connected to the upper rotating ring, and the limit rod being selectively located in the slot and sliding longitudinally; Wherein, the support arm is transmission connected with the limiting plate and the limiting plug rod.

4. The vehicle-mounted fan according to claim 3, characterized in that: Included a first notch, wherein the first notch is arranged on the limiting plate; a second notch, the second notch being arranged on the limiting rod; A lever, wherein the middle portion of the lever is rotatably connected to the upper rotating ring, and both ends of the lever are respectively located in the first notch and the second notch; a second spring, wherein the second spring is arranged between the limit plate and the upper rotating ring, and the elastic force of the second spring is used to make the limit plate slide into the annular groove; Wherein, an axial convex strip is arranged at one end of the support arm close to the upper rotating ring; the axial convex strip can selectively drive the limit plate to slide in a direction away from the annular groove.

5. The vehicle-mounted fan according to claim 1, characterized in that: The upper part of the outer tube is provided with a linkage groove penetrating the outer tube; the linkage groove is arranged along the circumference of the outer tube; the driven column passes through the linkage groove.

6. The vehicle-mounted fan according to claim 1, characterized in that: A through groove is axially arranged on the tube wall of the structural tube, and the driven column is located in the through groove; a circumferential groove is circumferentially arranged on the tube wall of the structural tube, and the circumferential groove is located at the lower end of the through groove; two spaced-apart protrusions are arranged on the inner wall of the lower rotating ring, and the driving groove is formed between the two protrusions; the protrusion is located in the through groove.

7. The vehicle-mounted fan according to claim 1, characterized in that: A through rectangular groove is arranged on the wall of the outer tube; one end of the elastic plate is arranged at one end of the rectangular groove; the outwardly convex inclined block is located in the rectangular groove; and an inclined surface is arranged at one end of the outwardly convex inclined block facing the elastic plate.

8. The vehicle-mounted fan according to claim 2, characterized in that: The inner wall of the upper ratchet ring is provided with a plurality of sliding blocks evenly distributed along the circumferential direction; the outer wall of the structural tube is provided with a plurality of guide grooves arranged along the axial direction; and the sliding blocks are located in the guide grooves.

9. The vehicle-mounted fan according to claim 2, characterized in that: The outer wall of the upper ratchet ring is coaxially provided with an outer convex edge; the inner wall of the upper rotating ring is provided with an inner groove; the outer convex edge is rotatably connected in the inner groove.

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