CN213206029U - Liftable tower fan - Google Patents

Abstract

The utility model provides a liftable tower fan, including base and flexible pipe, flexible pipe setting is equipped with the air intake on the base and flexible from top to bottom on the base relatively, be equipped with the air outlet on the base, flexible intraductal being formed with the wind channel of air intake and air outlet intercommunication, be equipped with the fan in the base, the fan is used for passing through the air intake with outside air current and introduces in the wind channel to discharge through the air outlet. The utility model discloses a liftable tower fan can freely adjust the height of tower fan through setting up the flexible pipe of relative base flexible removal from top to bottom to change the air supply high range of tower fan, and saved the occupation of land space, conveniently accomodate.

Description

Liftable tower fan

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a liftable tower fan.

Background

Along with the improvement of the living standard of people and the requirement on the living environment, the appearance of the tower fan with a unique column type shape on the market improves the grade of the electric fan, the comfortable air quantity can be delivered when the tower fan is used at home, and the good decorative effect can be brought to the home environment, so the tower fan is more and more popular, has the characteristics of small occupied area, space saving and soft air supply compared with the traditional floor fan, and is widely applied to places such as families, offices, hospitals and the like.

Although current tower fan need not occupy the space like traditional floor fan sways from side to side, can realize the air supply of wide angle, but because the height of tower fan complete machine can not be adjusted, its air-out structure can't stretch out and draw back and occupation space in the direction of height, to batch production, the packaging material of its needs is many, the transportation space that occupies when the transportation is many, lead to the unable reduction of cost of transportation, to the house use, the altitude problem influences accomodating of product, can not satisfy user's user demand, influence user's experience.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a liftable tower fan has saved the occupation of land space, convenient storage.

The utility model provides a liftable tower fan, including base and flexible pipe, flexible pipe setting is in just can be relative on the base flexible from top to bottom the base, be equipped with the air intake on the base, be equipped with the air outlet on the flexible pipe, flexible intraductal be formed with the air intake with the wind channel of air outlet intercommunication, be equipped with the fan in the base, the fan is used for passing through outside air current the air intake is introduced in the wind channel, and pass through the air outlet is discharged.

Furthermore, the telescopic pipe comprises a first telescopic pipe and a second telescopic pipe which are coaxially arranged, the first telescopic pipe is telescopically accommodated in the base, the second telescopic pipe is telescopically accommodated in the first telescopic pipe, and the second telescopic pipe can drive the first telescopic pipe to extend and retract up and down.

Furthermore, a first limiting bump is arranged on the inner wall of the top of the first telescopic pipe, a second limiting bump is arranged on the outer wall of the bottom of the second telescopic pipe, and the second telescopic pipe is prevented from being pulled out of the first telescopic pipe through the matching of the first limiting bump and the second limiting bump.

Furthermore, a limiting structure is arranged between the first telescopic pipe and the second telescopic pipe, and the first telescopic pipe and the second telescopic pipe are fixed at any position after being stretched by the limiting structure.

Further, liftable tower fan still includes drive arrangement, be equipped with in the base and be used for the installation the fan with drive arrangement's holding chamber, drive arrangement includes first motor, drive shaft and transfer line, the transfer line is connected in the drive shaft, the transfer line sets up in the expansion pipe, the transfer line top with flexible roof portion is connected, first motor orders about the drive shaft is rotatory and then drives in the expansion pipe the transfer line rotates, so that flexible pipe is relative the base stretches out or retracts.

Further, the transmission rod is a plurality of, and a plurality of transmission rods are threaded with each other.

Further, still be equipped with the separator in the telescopic pipe, the separator is used for with the inner space partition of telescopic pipe becomes wind channel with accept the chamber, the transfer line sets up accept the intracavity.

Furthermore, the base is provided with a fixed pipe corresponding to the air outlet end of the fan, and the telescopic pipe is telescopically accommodated in the fixed pipe.

Further, the fan is an oblique flow fan or a turbine fan,

when the fan is the diagonal flow fan, the diagonal flow fan includes second motor and diagonal flow impeller, the diagonal flow impeller is hopper-shaped and includes a plurality of helical blade, the second motor orders about the diagonal flow impeller is rotatory to introduce the air current that produces in the expansion pipe.

When the fan is a turbofan, the turbofan comprises a third motor, a fan blade part, a connecting frame and an air deflector, the fan blade part comprises a plurality of blades, the blades are arranged at intervals around the circumferential direction of the connecting frame, the connecting frame is connected with the third motor, the air deflector surrounds the fan blade part, an air guide opening is formed in the air inlet end corresponding to the telescopic pipe, the third motor drives the connecting frame to drive the fan blade part to rotate, so that the fan blade part generates centrifugal air flow, and the centrifugal air flow is introduced into the telescopic pipe through the air deflector.

Furthermore, a heating element and/or a refrigerating element are arranged in the base, and the heating element and/or the refrigerating element are arranged corresponding to the air outlet end of the fan;

or one or more of a light-emitting element, a wireless module, a humidifying module, an air purifying module, a negative ion generating module and a voice control module are/is further arranged in the base and/or the telescopic pipe.

The utility model provides a liftable tower fan sets up the flexible pipe that can stretch out and draw back from top to bottom relative base on the base, has seted up the air outlet on flexible pipe, can realize the height of freely adjusting the tower fan through flexible pipe to change the air supply high range of tower fan, do not influence the operation of fan in the lift, make the tower fan conveniently accomodate, do not account for the space, and can be through changing tower fan height, make the wind energy that the tower fan blown out enough cover wider scope, it is more extensive to be suitable for the scene.

Drawings

Fig. 1 is a schematic structural view of a liftable tower fan in an embodiment of the present invention;

fig. 2 is a schematic structural view of a liftable tower fan in a retracted state according to a second embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of FIG. 2;

fig. 4 is a schematic structural view of a liftable tower fan in an extended state according to a second embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of FIG. 4;

FIG. 6 is an enlarged view of the point A in FIG. 5;

fig. 7 is a schematic view of a splitting structure of a liftable tower fan in the second embodiment of the present invention;

fig. 8 is a schematic structural view of a liftable tower fan in the third embodiment of the present invention;

fig. 9 is a schematic view of a splitting structure of a liftable tower fan in the third embodiment of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Example one

As shown in fig. 1, the embodiment of the present invention provides a liftable tower fan, which comprises a base 1 and at least one telescopic tube 2, wherein the telescopic tube 2 is disposed on the base 1 and can be vertically extended and retracted relative to the base 1, and the height of the tower fan can be freely adjusted by extension and retraction of the telescopic tube 2.

An air inlet 11 is arranged on the base 1, an air outlet 201 is arranged on the telescopic pipe 2, an air channel communicated with the air inlet 11 and the air outlet 201 is formed in the telescopic pipe 2, and a fan is arranged in the base 1 and used for introducing external air flow into the air channel through the air inlet 11.

In this embodiment, the base 1 is a cone-shaped base 1, and the contact area between the chassis and the ground is large, so that the structural stability is increased, and the tower fan is prevented from toppling over.

In the embodiment, the number of the telescopic tubes 2 is one, and the telescopic tubes 2 are telescopically accommodated in the base 1. Further, a containing cavity (not shown) for installing a fan is arranged in the base 1, a hollow fixed pipe is further arranged in the containing cavity for enabling the telescopic pipe 2 to be convenient to install, the fixed pipe is fixed on the base 1, the telescopic pipe 2 is telescopically accommodated in the fixed pipe, the fan is arranged close to the bottom of the fixed pipe, the inner space of the fixed pipe is communicated with an air channel of the telescopic pipe 2, and an air outlet end of the fan is exhausted towards the fixed pipe to enable air flow to be concentrated into the air channel and be discharged.

Preferably, the air inlet 11 is disposed corresponding to the blower, i.e., disposed near the lower end of the base 1, but not limited thereto. Specifically, the air inlet 11 includes a plurality of through holes arranged along the circumferential direction of the base 1, and the shape of the through holes includes, but is not limited to, a strip-shaped hole or a circular hole; the air outlet 201 is the bar air outlet 201 that sets up at the lateral wall of every flexible pipe 2 and set up along vertical direction, and then makes the air current discharge from flexible pipe 2 through bar air outlet 201.

In one embodiment, the extension tube 2 can be pulled out or retracted manually, wherein a tight fit connection between the extension tube 2 and the stationary tube is achieved for positioning the extension tube 2 on the base 1. Preferably, the outer wall of the bottom of the telescopic tube 2 is provided with a first limiting projection (not shown), the inner wall of the top of the fixed tube is provided with a second limiting projection (not shown), and when the telescopic tube 2 extends to the maximum length, a blocking structure formed by the first limiting projection and the second limiting projection is mutually clamped and matched to prevent the telescopic tube 2 from being pulled out of the fixed tube.

In other embodiments, the telescopic tube 2 can also be automatically extended and retracted by driving of a motor, a first motor and a driving shaft are installed in the base 1, a transmission rod coaxially arranged with the driving shaft is installed in the telescopic tube 2, and the transmission rod is connected with the telescopic tube 2, and the driving shaft is driven to rotate by the first motor so as to drive the transmission rod to rotate out or back, so that the telescopic tube 2 extends or retracts.

Example two

The present embodiment is the same as the first embodiment, and the description of the same parts is omitted here, except that:

in this embodiment, as shown in fig. 2 to 7, the number of the extension tubes 2 is two, the two extension tubes 2 are respectively a first extension tube 21 and a second extension tube 22 coaxially disposed, the first extension tube 21 is sleeved on an outer wall of the second extension tube 22, the first extension tube 21 is telescopically accommodated in the fixed tube 3, that is, the fixed tube 3 is sleeved on an outer wall of the first extension tube 21, the second extension tube 22 is telescopically accommodated in the first extension tube 21, and the second extension tube 22 can drive the first extension tube 21 to extend and retract up and down.

The air duct 20 is also correspondingly arranged in the first telescopic tube 21 and the second telescopic tube 22, the side walls of the first telescopic tube 21 and the second telescopic tube 22 are both provided with a bar-shaped air outlet 201 along the vertical direction, the bar-shaped air outlet 201 of each tube is positioned on the same vertical straight line, the base 1 is provided with an air inlet 11 communicated with the air duct 20 and the air outlet 201, and the air flow in the air duct 20 is discharged from each tube through the bar-shaped air outlet 201.

Further, an air inlet plate 13 is further arranged in the base 1, the air inlet plate 13 is arranged parallel to the bottom plate 101 of the base 1, the fan is installed on the air inlet plate 13, an air inlet 11 is also formed in the air inlet plate 13, and an air inlet through hole is also formed in the area, between the air inlet plate 13 and the bottom plate 101, of the base 1.

Referring to fig. 6, a first limit bump 211 is disposed on an inner wall of a top portion of the first extension tube 21, the first limit bump 211 protrudes inward, a second limit bump 221 is disposed on an outer wall of a bottom portion of the second extension tube 22, the second limit bump 221 protrudes outward, when the second extension tube 22 extends to a maximum length, a blocking structure formed by the first limit bump 211 and the second limit bump 221 is clamped and matched with each other to prevent the second extension tube 22 from coming off from the first extension tube 21, and when the second extension tube 22 extends completely and continues to pull the second extension tube 22, the first limit bump 211 and the second limit bump 221 are matched to drive the first extension tube 21 to extend.

Preferably, in order to prevent the first telescopic tube 21 from being detached from the fixed tube 3, a blocking structure (not shown) is also provided on the outer wall of the bottom of the first telescopic tube 21 and the inner wall of the top of the fixed tube 3.

When the first extension tube 21 and the second extension tube 22 are extended, the second extension tube 22 is located above the first extension tube 21. A top cover 222 is arranged at the top end of second extension tube 22, and the outer diameter of top cover 222 is larger than the inner diameter of first extension tube 21, so that when second extension tube 22 is retracted, the top end of first extension tube 21 is pressed downwards by top cover 222 of second extension tube 22 to continue to drive first extension tube 21 to retract together until all of first extension tube 21 is located in base 1.

A limiting structure (not shown) is arranged between the first extension tube and the second extension tube, and the first extension tube and the second extension tube are fixed at any position after being extended and retracted through the limiting structure. Wherein, limit structure can carry on spacingly through the spacing mode of damping or buckle.

Specifically, limit structure includes damping piece, and damping piece for example is the rubber pad, and the rubber pad setting is between the pipe wall of first flexible pipe and the flexible pipe of second for the three closely cooperates, and the rubber pad has good anti-skidding effect, and at flexible in-process, has injectd the relative position between first flexible pipe and the flexible pipe of second well.

The limiting structure can also be a limiting hole arranged at the top of the first telescopic pipe and an elastic clamping block arranged at the bottom of the second telescopic pipe, and when the second telescopic pipe is pulled out for a certain length, the elastic clamping block is clamped in the limiting hole to realize the limiting between the first telescopic pipe and the second telescopic pipe.

In other embodiments, the first extension tube 21 and the second extension tube 22 can be limited by friction damping. Specifically, the first extension tube 21 and the second extension tube 22 are tightly matched, the inner wall of the first extension tube 21 and the outer wall of the second extension tube 22 are abutted against each other, that is, the inner diameter of the first extension tube 21 is equal to the outer diameter of the second extension tube 22, and the first extension tube 21 and the second extension tube 22 are clamped by friction damping, so that the second extension tube 22 is fixed at a specified height, the height of the tower fan can be freely adjusted, and the air supply height range of the tower fan can be changed.

Further, the liftable tower fan further comprises a driving device, the driving device is installed in the base 1, the driving device comprises a first motor 41, a driving shaft 42 and a transmission rod 43, and the transmission rod 43 is connected to the driving shaft 42.

In this embodiment, the number of the transmission rods 43 is two, the two transmission rods 43 are respectively a first transmission rod 431 and a second transmission rod 432 which are coaxially arranged, the second transmission rod 432 is sleeved on the outer wall of the first transmission rod 431, the first transmission rod 431 is arranged in the first extension tube 21, the second transmission rod 432 is arranged in the second extension tube 22, and the top of the second transmission rod 432 is connected with the top of the second extension tube 22.

Specifically, the driving shaft 42, the first transmission rod 431 and the second transmission rod 432 are sequentially in threaded connection, the driving shaft 42 is provided with a first external thread, the first transmission rod 431 is provided with a first internal thread, and the driving shaft 42 and the first transmission rod 431 are matched with the first internal thread through the first external thread to realize relative transmission; the first transmission rod 431 is provided with a second external thread, the second transmission rod 432 is provided with a second internal thread, and the second transmission rod 432 and the first transmission rod 431 are matched with each other through the second external thread and the second internal thread to realize relative transmission. When the first motor 41 drives the driving shaft 42 to rotate, the driving shaft 42 drives the first driving rod 431 and the second driving rod 432 to rotate synchronously, so that the first driving rod 431 and the second driving rod 432 move up and down to extend and retract the second telescopic tube 22 connected with the second driving rod 432, and when the second telescopic tube 22 is fully extended, the first limit bump 211 and the second limit bump 221 are matched to drive the first telescopic tube 21 to extend, that is, the first telescopic tube 21 moves along with the extension of the second telescopic tube 22, and the second telescopic tube 22 is far away from or close to the first motor 41.

In this embodiment, the liftable tower fan further includes two partitions 5, each partition 5 is correspondingly disposed in each telescopic pipe 2, the partitions 5 are used for partitioning the inner space of the telescopic pipe 2 into an air duct 20 and an accommodating cavity 23, the transmission rod 43 is disposed in the accommodating cavity 23, the partitions 5 enable the wind entering the air duct 20 to be concentrated, and the wind outlet force is also larger.

In other embodiments, the partitioning member 5 may not be provided, and the effect of concentrating wind power can be achieved by reducing the diameter of the extension tube 2.

Further, referring to fig. 7, a partition plate 31 is disposed in the fixed pipe 3, the partition plate 31 divides the fixed pipe 3 into two chambers, one of which is an installation chamber 301 for installing the driving device, the bottom of the installation chamber 301 is provided with an installation plate 32, the first motor 41 is installed on the installation plate 32, the other one is a ventilation chamber 302 for guiding the air of the fan 12 to the telescopic pipe 2, the ventilation chamber 302 is communicated with the air duct 20 and the fan 12, the air outlet end of the fan 12 is disposed corresponding to the ventilation chamber 302, and the air flow can be concentrated through the ventilation chamber 302.

In order to completely accommodate the first extension tube 21 into the fixed tube 3, the first extension tube 21 is provided with two first avoidance notches 212, the two first avoidance notches 212 are oppositely arranged and are used for avoiding the partition plate 31 of the fixed tube 3, and the first avoidance notches 212 axially extend towards the top end along the bottom end of the first extension tube 21 and do not penetrate through the top end. It can be understood that, in order to completely accommodate the second extension tube 22 into the fixed tube 3, a second avoidance gap 223 for avoiding the partition plate 31 of the fixed tube 3 is also provided on the second extension tube 22, and the specific structure of the second avoidance gap 223 may refer to the first avoidance gap 212, which is not described herein again.

In this embodiment, the fan 12 is an oblique flow fan, the oblique flow fan includes a second motor 121 and an oblique flow impeller 122, the oblique flow impeller 122 is connected to a driving shaft of the second motor 121, the oblique flow impeller 122 is disposed toward the extension tube 2, the oblique flow impeller 122 is funnel-shaped and includes a plurality of helical blades, and the second motor 121 drives the oblique flow impeller 122 to rotate so as to introduce the generated airflow into the extension tube 2.

Further, a heating element 120 is further arranged in the base 1, the heating element 120 is arranged corresponding to the air outlet end of the fan 12, and air blown out of the fan 12 is heated and then blown out through the air duct 20, so that the tower fan can be used as a fan heater 12 and is suitable for winter scenes. Preferably, a heating element is arranged inside the fixed pipe 3 close to the fan 12, i.e. below the ventilation chamber 302 of the fixed pipe 3, which may be a wire mesh heating wire. In other embodiments, a refrigeration element or a semiconductor refrigeration sheet may be disposed corresponding to the air outlet end of the fan 12 to be used as an air conditioning fan.

A light emitting element (not shown) is further disposed in the base 1, so that the emitted light can be emitted from the air inlet 11, and the tower fan can be used as a night light, thereby increasing the practicability and diversity of the tower fan. Specifically, the light emitting element may be an LED lamp, which is disposed on a circuit board (not shown) of the base 1.

Still be equipped with wireless module on the circuit board, WIFI or bluetooth for the tower fan can be established with mobile terminal such as cell-phone and be connected and accessible mobile terminal control tower fan work. In other embodiments, the circuit board is also provided with a microphone, so that a user can control the tower fan to work through voice, and the use of the tower fan is convenient; or still be equipped with humidification module, air purification module, anion generation module etc. be favorable to increasing the multifunctionality of product and improving user's quality of life.

EXAMPLE III

The present embodiment is the same as the embodiment, and the same parts are not described herein again, except that:

in the present embodiment, as shown in fig. 8 and 9, the base 1 is provided with a fixed pipe 3 corresponding to the air outlet end of the fan 12, the fixed pipe 3 is a hollow pipe, the telescopic pipe 2 is telescopically accommodated in the fixed pipe 3, and the telescopic pipe 2 is one.

The base 1 comprises a front shell 102 and a rear shell 103, the front shell 102 and the rear shell 103 enclose to form an accommodating cavity for installing the fan 12, and the rear shell 103 is provided with an air inlet 11.

In order to provide an installation space for the fan 12 located in the base 1, the fixed pipe 3 includes an inner pipe 33 and an outer pipe 34, the inner pipe 33 is disposed in the base 1 and located above the fan 12, the lower end of the outer pipe 34 is fixedly connected with the upper end of the inner pipe 33 and the upper end of the base 1, both the inner pipe 33 and the outer pipe 34 are communicated with the air duct 20 of the telescopic pipe 2, and the telescopic pipe 2 is telescopically accommodated in the outer pipe 34. Wherein, the outer tube 34 is provided with an air outlet, and the air outlet of the outer tube 34 and the air outlet 201 of the telescopic tube 2 are on the same straight line.

A mounting plate 32 is provided in the base 1, the mounting plate 32 is located above the fan 12 for mounting the driving device, and an inner pipe 33 is provided at one side of the driving device.

In order to prevent the extension tube 2 from separating from the fixed tube 6, a first limit bump (not shown) is disposed on the outer wall of the bottom of the extension tube 2, a second limit bump (not shown) is disposed on the inner wall of the top of the outer tube 34, and when the extension tube 2 extends to the maximum length, a blocking structure formed by the first limit bump and the second limit bump is engaged with each other to prevent the extension tube 2 from separating from the outer tube 34.

The top of the telescopic pipe 2 is connected with a transmission rod 43, and the first motor 41 drives the driving shaft 42 to rotate to drive the transmission rod 43 to extend or retract, so as to realize the up-and-down movement of the telescopic pipe 2.

In this embodiment, the fan 12 is a turbofan, the turbofan includes a third motor, a fan blade portion 124, a connecting frame 125 and an air guide plate 126, the fan blade portion 124 includes a plurality of blades, the plurality of blades are circumferentially spaced around the connecting frame 125, the connecting frame 125 is connected to the driving shaft 42 of the third motor, a vent hole is formed in the middle of the connecting frame 125, the air inlet 11 of the base 1 is communicated with the vent hole, the air guide plate 126 is disposed around the fan blade portion 124, and an air guide opening is disposed at an air inlet end corresponding to the extension tube 2, the third motor drives the connecting frame 125 to drive the fan blade portion 124 to rotate, so that the fan blade portion 124 generates centrifugal airflow, and the centrifugal airflow is introduced into the inner tube 33 through the outer tube 34 into the extension tube 2 through the air guide plate 126.

Specifically, the air deflector 126 is an arc-shaped plate, the air duct 20 of the telescopic tube 2 is arranged close to the right side, that is, the air guiding opening of the air deflector 126 is arranged close to the right side corresponding to the air duct 20, the gap between the air deflector 126 and the left side of the fan blade portion 124 is larger than the gap between the air deflector 126 and the right side of the fan blade portion 124, and the plurality of blades rotate clockwise to drive the external air flow to generate centrifugal air flow, and the centrifugal air flow is led out from the air guiding opening of the air deflector 126 to enter the fixed.

Each blade comprises a first surface and a second surface, wherein the first surface is an arc concave surface, and the second surface is an arc convex surface.

To sum up, the utility model provides a liftable tower fan sets up relative base 1 flexible pipe 2 from top to bottom on base 1, air outlet 201 has been seted up on flexible pipe 2, can realize the height of freely adjusting the tower fan through flexible pipe 2, thereby change the air supply high range of tower fan, and flexible mode can be manual or automatic, the variety of tower fan has been promoted, do not influence the operation of fan 12 in the lift, make the tower fan conveniently accomodate and transport, do not account for the space, the cost is saved, and can be through changing the tower fan height, make the wind energy that the tower fan blew out enough cover wider scope, it is more extensive to be suitable for the scene.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a liftable tower fan, its characterized in that, includes base and flexible pipe, flexible pipe setting is in just can be relative on the base flexible from top to bottom the base, be equipped with the air intake on the base, be equipped with the air outlet on the flexible pipe, flexible intraductal be formed with the air intake with the wind channel of air outlet intercommunication, be equipped with the fan in the base, the fan is used for passing through outside air current the air intake is introduced in the wind channel, and pass through the air outlet is discharged.

2. The liftable tower fan of claim 1, wherein the telescopic tube comprises a first telescopic tube and a second telescopic tube coaxially arranged, the first telescopic tube is telescopically received in the base, the second telescopic tube is telescopically received in the first telescopic tube, and the second telescopic tube can drive the first telescopic tube to vertically extend.

3. The liftable tower fan according to claim 2, wherein a first limiting bump is arranged on the inner wall of the top of the first telescopic pipe, a second limiting bump is arranged on the outer wall of the bottom of the second telescopic pipe, and the first limiting bump is matched with the second limiting bump to prevent the second telescopic pipe from being pulled out of the first telescopic pipe.

4. The liftable tower fan of claim 3, wherein a limiting structure is arranged between the first telescopic pipe and the second telescopic pipe, and the first telescopic pipe and the second telescopic pipe are fixed at any position after being stretched by the limiting structure.

5. A liftable tower fan according to claim 1, further comprising a driving device, wherein a containing cavity for installing the fan and the driving device is arranged in the base, the driving device comprises a first motor, a driving shaft and a transmission rod, the transmission rod is connected to the driving shaft, the transmission rod is arranged in the telescopic pipe, the top of the transmission rod is connected to the top of the telescopic pipe, and the first motor drives the driving shaft to rotate so as to drive the transmission rod in the telescopic pipe to rotate, so that the telescopic pipe extends or retracts relative to the base.

6. Liftable tower fan according to claim 5, wherein said transmission rods are multiple and are in threaded connection with each other.

7. Liftable tower fan according to claim 5 or 6, characterized in that a partition is further arranged in the telescopic pipe, the partition is used for partitioning the inner space of the telescopic pipe into the air duct and an accommodating cavity, and the transmission rod is arranged in the accommodating cavity.

8. The liftable tower fan of claim 7, wherein the base is provided with a fixed pipe corresponding to the air outlet end of the fan, and the telescopic pipe is telescopically accommodated in the fixed pipe.

9. Liftable tower fan according to claim 8, characterized in that the fan is a diagonal flow fan or a turbo fan,

when the fan is an oblique flow fan, the oblique flow fan comprises a second motor and an oblique flow impeller, the oblique flow impeller is funnel-shaped and comprises a plurality of helical blades, and the second motor drives the oblique flow impeller to rotate so as to introduce the generated airflow into the telescopic pipe;

when the fan is a turbofan, the turbofan comprises a third motor, a fan blade part, a connecting frame and an air deflector, the fan blade part comprises a plurality of blades, the blades are arranged at intervals around the circumferential direction of the connecting frame, the connecting frame is connected with the third motor, the air deflector surrounds the fan blade part, an air guide opening is formed in the air inlet end corresponding to the telescopic pipe, the third motor drives the connecting frame to drive the fan blade part to rotate, so that the fan blade part generates centrifugal air flow, and the centrifugal air flow is introduced into the telescopic pipe through the air deflector.

10. The liftable tower fan of claim 9, wherein a heating element and/or a refrigerating element is further arranged in the base, and the heating element and/or the refrigerating element is arranged corresponding to the air outlet end of the fan;

or one or more of a light-emitting element, a wireless module, a humidifying module, an air purifying module, a negative ion generating module and a voice control module are/is further arranged in the base and/or the telescopic pipe.

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