Double-head bladeless fan

Abstract

A double-head bladeless fan, comprising a base, a motor and a fan blade, the side of the base is provided with an air inlet, the upper end of the air duct straight pipe is provided with an air inlet duct assembly, the air inlet duct assembly comprises an air inlet duct support and two air inlet duct pipe fittings, the air inlet duct support is rotatably installed on the front side of the upper end of the air duct straight pipe, the two air inlet duct pipe fittings are rotatably installed on the front end of the air inlet duct support through respective air inlet duct rotary pivots and can rotate 0-180 DEG up and down on the longitudinal plane, the air inlet duct rotary pivot is respectively provided with an upwardly bent inner air duct, the lower end of the inner air duct is communicated with the air duct straight pipe, the air inlet duct pipe fitting is vertically installed on the upper end of the air inlet duct rotary pivot and is communicated with the upper end of the inner air duct and can rotate 0-90 DEG left and right on the horizontal plane, and the front surface of the air inlet duct pipe fitting is provided with an air outlet. The structure is more reasonable, the two air inlet duct pipe fittings can realize multi-angle adjustment, the adjustment range is wider, the blowing effect and blowing range are effectively increased, and the operation is convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of household appliances, and relates to a fan, in particular to a double-head bladeless fan. BACKGROUND

[0002] The bladeless fan is also called air doubling machine, and it can produce natural and continuous cool wind. The working principle of the bladeless fan is that the 40-watt power motor in the base sucks 33 liters of air into the base interior of the fan every second, and the air flow speed is increased by about 16 times after being accelerated by the cyclone accelerator, and the air is blown out outward at high speed through the annular inner lip of the fan head. Compared with the traditional fan, the bladeless fan is more safe, environmental and comfortable because of no blade, which will not cover dust or hurt the fingers of children.

[0003] At present, most of the bladeless fans on the market are single-head and fixed, the blowing range is small, the blowing angle cannot be adjusted, and the user experience is affected.

[0004] After investigation, the existing Chinese patent No. CN202411986593.3 "Bladeless fan" includes a base, a fan motor assembly arranged in the base, an air inlet arranged on one side of the base, and an air outlet arranged on the upper end of the base. A straight pipe of the air duct is rotatably installed on the upper end of the base and communicates with the air outlet, the other end of the straight pipe of the air duct communicates with a bent pipe of the air duct, one end of the bent pipe of the air duct communicates with a shunt pipe, the shunt pipe includes a first pipe opening, a second pipe opening and a third pipe opening, the first pipe opening is rotatably connected to one end of the bent pipe of the air duct, the second pipe opening communicates with a left nozzle assembly, and the third pipe opening communicates with a right nozzle assembly. An anechoic cover is arranged on the air inlet of the fan motor assembly, the side wall of the anechoic cover is provided with an anechoic structure, the anechoic structure includes an outer air inlet arranged on the outer wall of the anechoic cover, an inner air inlet arranged on the inner wall of the anechoic cover, and an anechoic channel connecting the outer air inlet and the inner air inlet. The bladeless fan has left and right two nozzle assemblies, the straight pipe of the air duct can rotate relative to the base, the shunt pipe can rotate 360 degrees relative to the bent pipe of the air duct, so that the blowing range of the left nozzle assembly and the right nozzle assembly can be adjusted, but the left nozzle assembly and the right nozzle assembly cannot rotate, and the structure needs to be further improved. SUMMARY

[0005] The utility model solves the technical problem in the above technical status, and provides a double-head bladeless fan with more reasonable structure design and wider angle adjustment range.

[0006] The utility model discloses a technical scheme that solves the above technical problems, which is a double-head bladeless fan, comprising a base, a motor and a fan blade arranged in the base, and a side surface of the base is provided with an air inlet, characterized in that: an air outlet assembly is installed at an upper end of the air duct straight pipe, the air outlet assembly comprises an air outlet bracket and two air outlet pipes arranged left and right, the air outlet bracket is rotatably installed at the front side of the upper end of the air duct straight pipe on the longitudinal surface, the two air outlet pipes are rotatably installed at the front end of the air outlet bracket through respective air outlet rotary pivots and can rotate 0-180 degrees up and down on the longitudinal surface, an inner air duct is arranged in each air outlet rotary pivot and is upwardly bent, the lower end of the inner air duct is connected with the air duct straight pipe, the air outlet pipe is vertically installed at the upper end of the air outlet rotary pivot and is connected with the upper end of the inner air duct and can rotate 0-90 degrees left and right on the horizontal surface, and an air outlet is arranged on the front surface of the air outlet pipe.

[0007] Further, the upper end of the air duct straight pipe is connected with an air duct joint, the air duct joint comprises a joint shell and an air duct elbow arranged in the joint shell, the lower end of the air duct elbow is connected with the air duct straight pipe, the front end of the air duct elbow is connected with the air outlet bracket, and a rotary limiting mechanism is arranged between the air outlet bracket and the air duct elbow.

[0008] Still further, the rotary limiting mechanism comprises a limiting ring and a spring, the front end of the air duct elbow is formed with a limiting connection section for sleeving and rotating the air outlet bracket, the rear end of the air outlet bracket is fixed with a bracket rear shell, the bracket rear shell is assembled by an upper shell and a lower shell, the upper shell and the lower shell are matched to form a circular hollow part in the middle part, the air outlet bracket is rotatably sleeved on the air duct elbow through the bracket rear shell, the limiting ring is sleeved on the limiting connection section and abuts against the bracket rear shell, a plurality of positioning grooves are uniformly and separately arranged on the rear end of the bracket rear shell, a positioning tooth block matched with the positioning grooves is protruded on the front surface of the limiting ring, and the first spring is arranged between the rear end of the limiting ring and the outer wall of the limiting connection section, so that the limiting ring has a tendency to always move forward and be locked with the bracket rear shell.

[0009] Still further, the positioning tooth block is a triangular block, the four positioning tooth blocks are uniformly and separately arranged on the limiting ring in the circumferential direction, the four positioning grooves are correspondingly arranged on the bracket rear shell, the air outlet bracket can rotate 360 degrees and be positioned every 90 degrees, the four first springs are arranged, a spring column is protruded on the rear surface of the limiting ring, the front end of the first spring is sleeved on the spring column, and the rear end of the first spring is connected and supported with the outer wall of the air duct elbow through a spring connecting sleeve.

[0010] Still further, the front end of the air outlet bracket is provided with a connecting seat for connecting and rotating the two air outlet rotary pivots arranged left and right, the air outlet rotary pivot is an L-shaped sleeve structure with the upper end and the rear end being open, the inner air duct is a corresponding L-shaped sleeve, the inner air duct is fixedly arranged in the air outlet rotary pivot, the inner air duct and the connecting seat are rotatably connected through a rotating shaft, and a first damping mechanism is arranged on the rotating shaft and the front side of the inner air duct.

[0011] Further, the first damping mechanism comprises a damping limiting sleeve ring, a first damping member, a second spring and a spring support arranged in sequence from front to back, wherein the spring support is fixed to the front side of the inner air duct, the middle part of the connecting seat is provided with a shaft hole, the front side of the inner air duct is provided with a corresponding through hole, a connecting shaft passes through the shaft hole of the connecting seat, the through hole of the inner air duct and is connected and fixed with the damping limiting sleeve ring, and the air port rotary pivot and the inner air duct can rotate along the connecting shaft; the first damping member is a circular ring and is arranged at the rear side of the damping limiting sleeve ring, a plurality of limiting convexes are arranged on the first damping member in a ring direction, a clamping groove for the limiting convexes to clamp is arranged on the rear surface of the damping limiting sleeve ring in a ring direction, one end of the second spring is arranged on the spring support and the other end abuts against the first damping member, so that the first damping member has a tendency to always move forward and clamp with the clamping groove of the damping limiting sleeve ring.

[0012] Further, the limiting convexes on the first damping member are four uniformly spaced, and the clamping grooves on the rear surface of the damping limiting sleeve ring are uniformly distributed along the circumference.

[0013] Further, the lower end of the air port pipe is provided with a reduced diameter circular connecting sleeve, the upper end of the air port rotary pivot is concave with a corresponding circular connecting hole, the air port pipe is inserted into the circular connecting hole through the circular connecting sleeve and is connected with the air port rotary pivot to rotate 0-90°; a circular step for the second damping mechanism is arranged in the circular connecting hole, the second damping mechanism comprises a damping limiting ring, a plurality of second damping members and a third spring, the damping limiting ring is fixedly sleeved outside the circular connecting sleeve, the lower end of the damping limiting ring is provided with a groove for the second damping member to clamp, a spring seat is arranged on the circular step, the lower end of the third spring is arranged on the spring seat, and the upper end of the third spring abuts against the second damping member, so that the second damping member has a tendency to always move upward and be positioned by clamping in the groove of the damping limiting ring.

[0014] Preferably, the second damping member is four uniformly spaced, the spring is corresponding four, and the grooves on the lower surface of the damping limiting ring are a plurality of uniformly distributed in a ring direction.

[0015] Finally, the base is in a circular truncated cone structure, the air inlet is arranged on the rear side of the base, the base is provided with an air duct shell coaxially penetrating the straight pipe of the air duct, the motor and the fan blade are arranged in the air duct shell, and the front end of the base is provided with a switch button.

[0016] Compared with the prior art, the utility model discloses the advantages lies in: be equipped with two wind port way pipe fittings, and two wind port way pipe fittings can be 180 degrees rotation respectively on the longitudinal plane, can also be 90 degrees rotation respectively on the transverse plane, realize the blowing of different angle, whole wind port way subassembly can realize 360 degrees rotation on the longitudinal plane through the wind port way support, greatly increase the blowing range, the utility model discloses the structure is more reasonable, and two wind port way pipe fittings can realize multi -angle adjustment, and the adjustment range is wider, effectively increased the blowing effect and blowing range, convenient operation simultaneously, rotation has the damping feeling, better satisfy the user needs. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure schematic drawing of the utility model embodiment;

[0018] Figure 2 It is the structure schematic drawing of two wind port way pipe fittings respectively after rotating;

[0019] Figure 3 It is Figure 2 The internal structure exploded view of area A in middle;

[0020] Figure 4 It is the structure schematic drawing of two wind port way pipe fittings respectively after rotating 90 degrees;

[0021] Figure 5 It is Figure 4 The internal structure exploded view of area B in middle;

[0022] Figure 6 It is the structure schematic drawing of whole wind port way subassembly after rotating 90 degrees;

[0023] Figure 7 It is Figure 6 The internal structure exploded view of area C in middle;

[0024] Figure 8 It is Figure 6 The internal structure exploded view of area C in middle;

[0025] Figure 9 It is Figure 6 The internal structure exploded view of area C in middle;

[0026] Figure 10 It is the air flow direction drawing of the utility model embodiment;

[0027] Figure 11 It is the air flow direction drawing of another angle of the utility model embodiment. DETAILED DESCRIPTION

[0028] The utility model will be further described in detail below in combination with the drawings embodiment.

[0029] AsFigures 1-11 As shown in the drawings, a double-head bladeless fan comprises a base 1, a motor 10 and a fan blade 20 arranged in the base 1, the side of the base 1 is provided with an air inlet, the upper end of the base 1 is provided with an air outlet, the upper end of the base 1 is vertically provided with a straight air duct 2 connected with the air outlet, the upper end of the straight air duct 2 is provided with an air outlet duct assembly 100, the air outlet duct assembly 100 comprises an air outlet duct support 4 and two air outlet duct pipes 5, the air outlet duct support 4 is rotatably arranged on the front side of the upper end of the straight air duct 2 in the longitudinal plane by 360°, the two air outlet duct pipes 5 are rotatably arranged on the front end of the air outlet duct support 4 through respective air outlet duct rotating pivots 6 and can rotate up and down by 0-180° in the longitudinal plane, the air outlet duct rotating pivot 6 is respectively provided with an upwardly bent inner air duct 60, the lower end of the inner air duct 60 is connected with the straight air duct 2, the air outlet duct pipe 5 is vertically arranged on the upper end of the air outlet duct rotating pivot 6 and is connected with the upper end of the inner air duct 60 and can rotate left and right by 0-90° in the transverse plane, the front surface of the air outlet duct pipe 5 is provided with an air outlet.

[0030] The specific structure is that the upper end of the air duct straight pipe 2 is connected with an air duct joint 3, the air duct joint 3 comprises a joint shell and an air duct elbow 30 arranged in the joint shell, the joint shell is formed by the joint of an upper cover 31 and a lower cover 32, the lower end of the air duct elbow 30 is communicated with the air duct straight pipe 2, the front end of the air duct elbow 30 is connected with an air duct opening support 4, and a rotary limiting mechanism 9 is arranged between the air duct opening support 4 and the air duct elbow 30. The rotary limiting mechanism 9 comprises a limiting ring 91 and a first spring 92, the front end of the air duct elbow 30 is formed with a limiting connecting section 301 for sleeving and rotating the air duct opening support 4, the rear end of the air duct opening support 4 is fixed with a support rear shell 40, the support rear shell 40 is assembled by an upper shell 401 and a lower shell 402, and the upper shell 401 and the lower shell 402 are formed with a circular hollow part 403 matched with the limiting connecting section 301 after being jointed, the assembly of the support rear shell 40 and the air duct opening support 4 is as follows: the front end of the upper shell 401 is provided with a reverse buckle 404, the inner wall of the rear end of the air duct opening support 4 is provided with a corresponding buckle groove 41, the upper shell 401 is fixed with the air duct opening support 4 in a reverse buckling mode, and the lower shell 402 is also fixed with the air duct opening support 4 in a reverse buckling mode. The upper shell 401 and the lower shell 402 are fixed by bolts 406 after being jointed. The air duct opening support 4 is rotatably sleeved on the limiting connecting section 301 of the air duct elbow 30 through the support rear shell 40, the limiting ring 91 is sleeved on the limiting connecting section 301 and abuts against the support rear shell 40, a plurality of positioning grooves 405 are uniformly and interval arranged on the rear end of the support rear shell 40, the front surface of the limiting ring 91 is provided with positioning tooth blocks 911 matched with the positioning grooves, and the first spring 92 is supported between the rear end of the limiting ring 91 and the outer wall of the limiting connecting section 301, so that the limiting ring 91 has a tendency of being always moved forward and locked with the support rear shell 40. The positioning tooth blocks 911 are triangular blocks, the positioning tooth blocks 911 are four blocks uniformly and interval arranged along the circumference of the limiting ring 91, the positioning grooves 405 of the support rear shell 30 are corresponding four grooves, the air duct opening support 4 can rotate by 360 degrees and is positioned every 90 degrees, the first spring 92 is four springs, the rear surface of the limiting ring 91 is provided with a spring column, the front end of the first spring 92 is sleeved on the spring column, and the rear end of the first spring 92 is connected and supported with the outer wall of the air duct elbow 30 through a spring connecting sleeve 93.

[0031] The front end of the tuyere channel support 4 is provided with a connecting seat 42 for connecting and rotating the left and right two tuyere channel rotary pivots 6. The tuyere channel rotary pivot 6 is an L-shaped sleeve structure with open upper end and rear end. The inner tuyere channel 60 is a corresponding L-shaped sleeve. The inner tuyere channel 60 is fixedly arranged in the tuyere channel rotary pivot 6. The inner tuyere channel 60 is rotatably connected with the connecting seat through a rotating shaft. The first damping mechanism 7 is arranged on the rotating shaft and the front side of the inner tuyere channel 60. The first damping mechanism 7 comprises a damping limiting sleeve ring 71, a first damping member 72, a second spring 74 and a spring support 73 arranged in sequence from front to back. The spring support 73 is fixedly arranged on the front side of the inner tuyere channel 60. The middle part of the connecting seat 42 is provided with a shaft hole. The front side of the inner tuyere channel 60 is provided with a corresponding through hole. A connecting shaft is connected and fixed with the damping limiting sleeve ring 71 by penetrating the shaft hole of the connecting seat 42 and the through hole of the inner tuyere channel 60. The tuyere channel rotary pivot 6 and the inner tuyere channel 60 can rotate along the connecting shaft. The first damping member 72 is a circular ring arranged on the rear side of the damping limiting sleeve ring 71. A plurality of limiting convexes 721 are arranged on the first damping member 72 in a ring direction. A clamping groove 711 is arranged on the rear surface of the damping limiting sleeve ring 71 in a ring direction for clamping the limiting convexes 721. The rear end of the first damping member 72 is provided with a spring column. One end of the second spring 74 is arranged on the spring support 73 and the other end is connected with the spring column of the first damping member 72. The first damping member 72 has a tendency to always move forward and be clamped with the clamping groove 711 of the damping limiting sleeve ring 71. The limiting convexes 721 on the first damping member 72 are usually four uniformly spaced ones. The clamping grooves 711 on the rear surface of the damping limiting sleeve ring 71 are uniformly distributed in a ring direction. The second spring 74 is four uniformly spaced ones.

[0032] The lower end of the tuyere channel pipe 5 is provided with a circular connecting sleeve 51 with a reduced diameter. The upper end of the tuyere channel rotary pivot 6 is provided with a corresponding circular connecting hole 61. The tuyere channel pipe 5 is inserted into the circular connecting hole 61 through the circular connecting sleeve 51 to be rotatably connected with the tuyere channel rotary pivot 6 in a horizontal plane at an angle of 0-90°. The circular connecting hole 61 is provided with a circular step for accommodating the second damping mechanism 8. The second damping mechanism 8 comprises a damping limiting ring 81, a plurality of second damping members 82 and a third spring 83. The damping limiting ring 81 is fixedly arranged outside the circular connecting sleeve 51. The lower end of the damping limiting ring 81 is provided with a recess for clamping the second damping member 82. The circular step is provided with a spring seat 62. The lower end of the third spring 83 is arranged on the spring seat 62. The upper end of the third spring 83 is abutted with the second damping member 82. The second damping member 82 has a tendency to always move upward and be clamped with the recess of the damping limiting ring 81. The second damping member 82 of the embodiment is four uniformly spaced ones in a ring direction. The third spring 83 is four corresponding ones. The base 1 is a circular table structure. The air inlet is arranged on the rear side of the base 1. The base 1 is provided with a tuyere shell 50 coaxially penetrating the tuyere straight pipe 2. The motor 10 and the fan blade 20 are arranged in the tuyere shell 50. The front end of the base 1 is provided with a switch button.

[0033] The working principle is as follows:

[0034] Two air port ducts 5 can be rotated up and down by 0-180° on the longitudinal plane, as shown in Figure 2 、 3 The first damping member 72 is pushed into the clamping groove of the damping limiting ring 71 by the second spring 74, so that the air port rotating pivot 6 can be in a stable state, when the air port duct 5 is manually rotated, the first damping member 72 is forced to push backward, and the square limiting convex 721 falls into the next clamping groove, and the cycle is repeated.

[0035] Two air port ducts 5 can be rotated forward and backward by 0-90° on the horizontal plane, as shown in Figure 4 、 5 A second damping mechanism 8 similar to the above is used, the second damping member 81 is pushed into the groove of the damping limiting ring 81 by the third spring 83, so that the air port duct 5 can be in a stable state, when the air port duct 5 is manually rotated, the second damping member 82 is forced to push backward, and the second damping member 81 falls into the next groove in the direction of the force, and the cycle is repeated.

[0036] The entire air port assembly 100 can be rotated by 360° on the horizontal plane, as shown in Figure 6 、 7 The rotating limiting mechanism 9 plays a damping role when manually rotating every 90°, so that the entire air port assembly 100 can be positioned in four positions of up, down, left and right when manually rotated.

[0037] In operation, as shown in Figure 8 、 9 Air enters from the air inlet of the base 1, passes through the air duct straight pipe 2, and then passes through the two inner air ducts 60 to enter the air port duct 5, and finally blows out from the air outlet on the front surface of the air port duct 5. Since the air port duct 5 is two, and the direction can be adjusted by a plurality of angles, the blowing range and blowing effect are greatly increased.

[0038] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principle of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection range of the present application.

Claims

1. A double-headed bladeless fan, comprising a base, a motor and fan blades disposed within the base, an air inlet on the side of the base, an air outlet at the upper end of the base, and a vertical straight duct connected to the air outlet at the upper end of the base, characterized in that: An air duct assembly is installed at the upper end of the straight duct. The air duct assembly includes an air duct bracket and two air duct fittings on the left and right. The air duct bracket is rotatably mounted on the upper front side of the straight duct in the longitudinal plane. The two air duct fittings are mounted on the front end of the air duct bracket through their respective air duct rotation pivots and can rotate up and down 0 to 180 degrees in the longitudinal plane. Each air duct rotation pivot has an upwardly bent inner air duct. The lower end of the inner air duct is connected to the straight duct. The air duct fittings are vertically mounted at the upper end of the air duct rotation pivot and connected to the upper end of the inner air duct. They can rotate left and right 0 to 90 degrees in the transverse plane. The front surface of the air duct fittings has an air outlet.

2. The double-head bladeless fan according to claim 1, characterized in that: The upper end of the straight duct is connected to a duct connector. The duct connector includes a connector housing and a duct bend disposed inside the connector housing. The lower end of the duct bend is connected to the straight duct, and the front end of the duct bend is connected to the duct support. A rotation limiting mechanism is provided between the duct support and the duct bend.

3. The double-headed bladeless fan according to claim 2, characterized in that: The rotating limiting mechanism includes a limiting ring and a spring. The front end of the duct bend has a limiting connecting section for the duct support to be fitted and rotated. The rear end of the duct support is fixedly fitted with a support rear shell, which is assembled from an upper shell and a lower shell. After the upper shell and the lower shell are fitted together, a circular hollow part is formed in the middle that cooperates with the limiting connecting section. The duct support is rotatably fitted onto the duct bend through the support rear shell. The limiting ring is fitted onto the limiting connecting section and abuts against the support rear shell. The rear end of the support rear shell is provided with several positioning grooves evenly spaced around it. The front surface of the limiting ring is provided with positioning teeth that cooperate with the positioning grooves. A first spring supports the rear end of the limiting ring and the outer wall of the limiting connecting section, so that the limiting ring has a tendency to move forward and lock with the support rear shell.

4. The double-head bladeless fan according to claim 3, characterized in that: The positioning teeth are triangular blocks, and there are four positioning teeth evenly spaced along the circumference of the limiting ring. The positioning grooves on the rear shell of the bracket are four corresponding ones. The air duct bracket can rotate 360 ​​degrees and achieve positioning every 90 degrees of rotation. There are four first springs. The rear surface of the limiting ring is provided with spring columns. The front end of the first spring is sleeved on the spring column. The rear end of the first spring is connected to the outer wall of the air duct bend through the spring connecting sleeve for support.

5. The double-headed bladeless fan according to claim 4, characterized in that: The front end of the air duct support is provided with a connecting seat for connecting and rotating the left and right air duct rotating pivots. The air duct rotating pivot is an L-shaped sleeve structure with openings at the top and rear ends. The inner air duct is a corresponding L-shaped sleeve. The inner air duct is fixedly installed inside the air duct rotating pivot. The inner air duct and the connecting seat are rotatably connected by a rotating shaft. A first damping mechanism is provided on the rotating shaft and on the front side of the inner air duct.

6. The double-head bladeless fan according to claim 5, characterized in that: The first damping mechanism includes a damping limiting sleeve, a first damping element, a second spring, and a spring bracket arranged sequentially from front to back. The spring bracket is fixed to the front side of the inner air duct. The middle of the connecting seat has a shaft hole, and the front side of the inner air duct has a corresponding through hole. A connecting shaft passes through the shaft hole of the connecting seat and the through hole of the inner air duct and is connected and fixed to the damping limiting sleeve. The air outlet duct rotation pivot and the inner air duct can rotate along the connecting shaft. The first damping element is annular and is located on the rear side of the damping limiting sleeve. Several limiting protrusions are arranged circumferentially on the first damping element. The rear surface of the damping limiting sleeve has a circumferential groove for the limiting protrusions to engage. One end of the second spring is located on the spring bracket, and the other end abuts against the first damping element, so that the first damping element has a tendency to always move forward and engage with the groove of the damping limiting sleeve.

7. The double-head bladeless fan according to claim 6, characterized in that: The first damping member has four evenly spaced limiting protrusions, the damping limiting sleeve has grooves evenly distributed along the circumference, and the second spring has four evenly spaced springs.

8. The double-head bladeless fan according to claim 7, characterized in that: The lower end of the air duct fitting has a constricted circular connecting sleeve, and the upper end of the air duct rotation pivot has a corresponding circular connecting hole. The air duct fitting is inserted into the circular connecting hole through the circular connecting sleeve and can be rotated 0~90° to the air duct rotation pivot. The circular connecting hole has a circular step for the insertion of the second damping mechanism. The second damping mechanism includes a damping limiting ring, several second damping elements, and a third spring. The damping limiting ring is fixedly sleeved on the outside of the circular connecting sleeve. The lower end of the damping limiting ring has a groove for the second damping elements to be engaged. A spring seat is provided on the circular step. The lower end of the third spring is set on the spring seat, and the upper end of the third spring abuts against the second damping elements, so that the second damping elements have a tendency to always move upward and be engaged and positioned in the groove of the damping limiting ring.

9. The double-head bladeless fan according to claim 8, characterized in that: The second damping element consists of four evenly spaced components, and there are four corresponding springs. The grooves on the lower surface of the damping limiting ring are evenly distributed in a circumferential direction.

10. The dual-head bladeless fan according to any one of claims 1 to 9, characterized in that: The base has a frustum-shaped structure, with the air inlet located on the rear side of the base. Inside the base is an air duct shell that is coaxially connected to the straight air duct pipe. The motor and fan blades are located inside the air duct shell, and a switch button is located at the front end of the base.

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