CN114738998A

CN114738998A - Fan and using method thereof

Info

Publication number: CN114738998A
Application number: CN202210240467.8A
Authority: CN
Inventors: 应辉; 周小锋
Original assignee: Zhejiang Crossbow Brand Electric Appliance Co ltd
Current assignee: Zhejiang Crossbow Brand Electric Appliance Co ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-07-12

Abstract

The invention provides a fan and a use method thereof, wherein the fan comprises: a body including an air inlet, an air outlet, a fan for generating an air flow, a heating unit for heating the air flow, and a heat generation power switching module driving the heating unit; and at least one air emitting member separably connected to the air outlet of the body part and used for receiving the air flow heated by the body part and emitting the air flow, wherein the lower end of the air emitting member is provided with at least one trigger member, the intervals between the trigger members of the air emitting member and the lower ends of the trigger members are different, the air outlet of the body part is provided with at least one switch electrically connected with the heating power switching module, and when the air emitting member is communicated with the air outlet, the trigger members abut against the switch to trigger the heating power switching module to switch the heating power of the heating unit. The air emitting piece and the body part can be detached, so that different types of air emitting pieces can be replaced, and the air emitting piece with different functions can be connected to adapt to different use scenes.

Description

Fan and using method thereof

Technical Field

The invention relates to the field of air conditioning equipment, in particular to a fan and a using method thereof.

Background

With the continuous improvement of the living and scientific and technological levels, the requirements of people on living quality are increasingly improved, and the indoor air quality becomes an important concern of people. Particularly, the haze and PM2.5 problems in recent years have increased, and people are increasingly demanding air purifiers.

An air purifier is a small household appliance for purifying indoor air, and mainly solves the problem of indoor air pollution caused by decoration or other reasons. Because of the persistent and uncertain nature of the release of pollutants in indoor air, the use of air purifiers to purify indoor air is an internationally recognized method of improving indoor air quality. There are a number of different technologies and media in air purifiers that enable them to provide clean and safe air to users. Common air purification techniques are: low-temperature asymmetric plasma air purification technology, adsorption technology, negative ion technology, negative oxygen ion technology, molecular complexation technology, nano TiO2 technology, HEPA high-efficiency filtration technology, electrostatic dust collection technology, active oxygen technology and the like; the material technology mainly comprises the following steps: the cost of high-quality filter screen can account for 20% to 30% of the total cost of the air purifier, such as photocatalyst, active carbon, synthetic fiber, HEPA high-efficiency material, etc.

At present, a plurality of bladeless fans which are provided with air filter screens and can be used for both cooling and heating have appeared. FIG. 1 is a cross-sectional view of a bladeless fan of the prior art. As shown in fig. 1, most of which have an annular nozzle 901, a housing 903, a base 904, a screen 905, a fan motor 906, and a mesh inner container 907. Wherein, shell 903 with air inlet mesh opening sets up on base 904, is equipped with filter screen 905 in the shell 903, is equipped with mesh inner bag 907 in the filter screen 905, is equipped with fan motor 906's first air inlet in the mesh inner bag 907, and annular nozzle 901 all sets up in fan motor 906's direction of gravity's top, and fan motor 906's air outlet intercommunication nozzle 901, the inside heating unit that is equipped with the bar setting of nozzle 901. Indoor air enters the mesh inner container 907 after sequentially passing through meshes of the outer shell 903 and the filter screen 905, an air inlet of the fan motor 906 sucks in the air along the antigravity direction, then the air is conveyed to one end of the annular nozzle 901 along the antigravity direction (vertically upwards), and then the air is sprayed out after being dispersed to all positions of the annular nozzle 901.

There are at least the following technical problems to be improved in the structure of the prior art:

(1) as the bladeless fan is provided with the large-volume heating unit close to the air outlet in order to realize dual purposes of cooling and heating, the heating unit is used as a high-power electric element and needs a power supply circuit to be connected to a power supply point module of the base. Under the structure, due to the existence of a power supply circuit for communicating the nozzle with the lower machine body, the nozzle and the lower machine body cannot be detached, the nozzle cannot be replaced, and the use scene of the bladeless fan is limited.

(2) The whole machine is huge in volume and high in transportation and storage cost due to the fact that the whole machine cannot be disassembled.

(3) Because the heating unit (containing a plurality of metal elements) with larger mass is arranged on the nozzle, the gravity center of the whole machine is moved upwards and the whole machine is easy to topple.

(4) Moreover, because the heating unit is close to the air outlet, the user can be scalded when extending the hand into the air outlet carelessly, and potential safety hazards exist.

(5) Because the nozzle can change the direction of air flow, the air quantity in the middle of the nozzle is larger, and the air quantities at the bottom and the top are smaller, so that the larger air quantity in the middle of the heating unit arranged in a strip shape in the middle can bring away larger heat, and high-heat hot air (H) is blown out; on the contrary, the air output at the upper end and the lower end is small, only low-heat hot air (L) can be blown out, and the service life of the heating unit is also reduced due to the fact that the air outlet temperature is uneven and the local heat at the two ends of the heating unit arranged in a strip shape is gathered.

Accordingly, the present invention provides a fan and a method of using the same.

Disclosure of Invention

The invention aims to provide a fan and a using method thereof, which solve the problems in the prior art that an air emitting piece and a body part can be detached, the replacement of different types of air emitting pieces is realized, and the fan can be suitable for different use scenes by connecting air emitting pieces with different functions.

An embodiment of the present invention provides a fan including:

a body including an air inlet, an air outlet, a fan for generating an air flow, a heating unit for heating the air flow, and a heating power switching module driving the heating unit; and

at least one air transmitting piece separably connected to the air outlet of the body part and used for receiving the air flow heated by the body part and transmitting the air flow, at least one trigger piece is arranged at the lower end of the air transmitting piece, the intervals between the trigger pieces and the lower ends of the trigger pieces are different, at least one selector switch electrically connected with the heating power switching module is arranged at the air outlet of the body part, and when the air transmitting piece is connected with the air outlet, the trigger piece abuts against the selector switch to trigger the heating power switching module to switch the heating power of the heating unit.

Preferably, an L-shaped chute is provided in an inner periphery of the air outlet of the body, an inlet is provided at a vertical end of the L-shaped chute, the switch is provided at a horizontal end, and the trigger member triggers the switch by rotating horizontally after being inserted from the inlet of the L-shaped chute.

Preferably, the L-shaped sliding chute comprises a vertical sliding chute and a horizontal sliding chute which are communicated with each other, a vertical opening is arranged at the end part of the vertical sliding chute, and the end part of the horizontal sliding chute is communicated with the selector switch.

Preferably, an end of the horizontal sliding groove is spatially overlapped with an elastic convex area of the switch, and the trigger reaching the horizontal end depresses the switch.

Preferably, the switch comprises N buttons arranged along the vertical direction, N is more than or equal to 2, and each button triggers the heating power switching module to switch different heating powers of the heating unit;

the triggering pieces of the N air emitting pieces are different from the lower ends of the N air emitting pieces in distance, and after the triggering pieces of the N air emitting pieces are inserted into the L-shaped sliding grooves and rotate, the buttons with different vertical heights are triggered to switch the corresponding heating power of the heating unit.

Preferably, the lower end of the air emitting piece is provided with a plurality of L-shaped clamping jaws, an air outlet on the upper surface of the body is provided with an L-shaped clamping groove, and the air emitting piece is rotationally clamped with the air outlet of the body.

Preferably, the heating unit is arranged at the downstream of the fan, the heating unit is connected to the power supply module through a heating power supply circuit only arranged in the body, the air flow passes through the heating unit in the antigravity direction and then is emitted to the air emitting pieces, at least one air emitting piece is a nozzle, and the nozzle receives the air flow heated by the body and guides the air flow to horizontally emit.

Preferably, the body further comprises a filter downstream of the air inlet and upstream of the fan;

the air inlet is arranged on the bottom surface of the body part, air is sucked in along the antigravity direction to reach a first air collecting cavity, and the air entering from the air inlet passes through the filter along the antigravity direction to reach a second air collecting cavity and is sucked into the fan.

Preferably, the body further comprises a sealed enclosure and a base;

the seal housing sealingly surrounds the fan and heating unit, and the body is rotatably connected above the base.

The embodiment of the invention also provides a using method of the fan, and the fan comprises the following steps:

separating the air emitting piece which is currently connected with the air outlet of the body, and releasing the corresponding switch of the air emitting piece; and

and connecting another air emitting member to the air outlet of the body, and when the other air emitting member is communicated with the air outlet, triggering another switch by the trigger member to switch the heating power of the heating unit.

The fan and the use method thereof can separate the air emitting piece and the body part, realize the replacement of different types of air emitting pieces, and can be suitable for different use scenes by connecting the air emitting pieces with different functions.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a bladeless fan of the prior art.

Fig. 2 is a cross-sectional view of the fan of the present invention.

Fig. 3 is a perspective view of the fan of the present invention.

Fig. 4 is a sectional view taken along the line a-a in fig. 3.

Fig. 5 is an exploded view of the fan of the present invention.

Fig. 6 is a sectional view taken along line B-B in fig. 5.

Fig. 7 is a perspective view of a body of the fan of the present invention.

Fig. 8 is an enlarged view of the region C in fig. 7.

Reference numerals

1 air emitting member

17L-shaped claw

18 clasp

19 triggering part

2 body part

20 sealed housing

21 bayonet

22L-shaped clamping groove

23 first gas collecting cavity

24 second gas collecting cavity

25L-shaped sliding chute

251 vertical opening

252 vertical chute

253 horizontal chute

26 switching switch

27 annular air inlet grille

28 air inlet

29 air outlet

3 heating unit

5 blower fan

6 Filter

7 base

Detailed Description

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present application. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Embodiments of the present application will be described in detail below with reference to the accompanying drawings so that those skilled in the art to which the present application pertains can easily carry out the present application. The present application may be embodied in many different forms and is not limited to the embodiments described herein.

Reference throughout this specification to "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. Furthermore, the particular features, structures, materials, or characteristics shown may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of different embodiments or examples presented in this application can be combined and combined by those skilled in the art without contradiction.

Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the expressions of the present application, "plurality" means two or more unless specifically defined otherwise.

In order to clearly explain the present application, components that are not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

Throughout the specification, when a device is referred to as being "connected" to another device, this includes not only the case of being "directly connected" but also the case of being "indirectly connected" with another element interposed therebetween. In addition, when a device "includes" a certain constituent element, unless otherwise specified, it means that the other constituent element is not excluded, but may be included.

When a device is said to be "on" another device, this may be directly on the other device, but may also be accompanied by other devices in between. When a device is said to be "directly on" another device, there are no other devices in between.

Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface, a second interface, etc. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" include plural forms as long as the words do not expressly indicate a contrary meaning. The term "comprises/comprising" when used in this specification is taken to specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but does not exclude the presence or addition of other features, regions, integers, steps, operations, elements, and/or components.

Although not defined differently, including technical and scientific terms used herein, all terms have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Terms defined in commonly used dictionaries are to be additionally interpreted as having meanings consistent with those of related art documents and the contents of the present prompts, and must not be excessively interpreted as having ideal or very formulaic meanings unless defined.

Fig. 2 is a cross-sectional view of the fan of the present invention. Fig. 3 is a perspective view of the fan of the present invention. Fig. 4 is a sectional view taken along the line a-a in fig. 3. Fig. 5 is an exploded view of the fan of the present invention. Fig. 6 is a sectional view taken along line B-B in fig. 5. Fig. 7 is a perspective view of a body of the fan of the present invention. Fig. 8 is an enlarged view of the region C in fig. 7. As shown in fig. 2 to 8, the fan of the present invention includes: a body 2 and at least one air emitting member 1. The body 2 comprises an air inlet 28, an air outlet 29, a fan 5 for generating an air flow, and a heating unit 3 for heating the air flow. At least one air emitting member 1 detachably connected to the air outlet 29 of the body 2 for receiving the air flow heated by the body 2 and emitting the air flow, at least one trigger member 19 is disposed at the lower end of the air emitting member 1, the intervals between the trigger members 19 of the air emitting member 1 and the respective lower ends are different, at least one switch 26 electrically connected to the heating power switching module is disposed at the air outlet 29 of the body 2, when the air emitting member 1 is communicated with the air outlet 29, the trigger member 19 (a guide block for triggering the switch 26 through a mechanical transmission relationship) abuts against the switch 26, and the heating power switching module is triggered to switch the heating power of the heating unit 3. The fan nozzle and the lower machine body can be detached, the nozzle can be replaced, and the use scene of the bladeless fan is expanded. And because the heating unit is put into somatic part 2 down, can make full use of the inner space of somatic part 2, install the board-like heat-generating body that effective heating area is bigger (the heating effect of board-like heat-generating body will obviously be higher than the heating effect of bar heat-generating body among the prior art), strengthen the energy conversion rate to, make the focus of complete machine move down, be difficult for empting. The heating unit is further far away from the air outlet, so that potential safety hazards are reduced. Moreover, the heating unit 3 in the invention can be a plate-shaped PTC heating element, and the air flow uniformly takes away all heat uniformly through the positive PTC heating element, thereby ensuring the heat transfer effect and prolonging the service life of the heating unit. Also, when different air emitting members 1 are used, different switching switches 26 of the body 2 can be triggered by the triggering members 19 of different positions of each air emitting member 1, so that the heating power of the heating unit 3 can be synchronously switched only by the connection operation based on the mechanical structure. In a modified embodiment, the trigger 19 may be an NFC proximity switch, a magnetic switch, or a light sensor, etc. cooperating with the switch 26, but not limited thereto.

The heating unit 3 of the invention is provided with a PTC (positive Temperature coefficient) heating body, and consists of a PTC ceramic heating element and an aluminum tube. The PTC heating element has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater. The PTC heating body product adopts the U-shaped corrugated radiating fins, so that the heat dissipation rate is improved, the advantages of adhesion and mechanical type are integrated, various thermal and electrical phenomena of the PTC heating element during working are fully considered, the bonding force is strong, the heat conduction and the heat dissipation performance are excellent, the efficiency is high, and the PTC heating body product is safe and reliable. The PTC heater has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant-temperature and electricity-saving electric heater. The PTC heater has the prominent characteristic of safety performance, namely, when the fan stops due to failure, the PTC heater can automatically and rapidly reduce the power because the PTC heater cannot fully dissipate heat, and the surface temperature of the heater is maintained at about the Curie temperature (generally about 250 ℃), so that the surface of the heater such as an electric heating tube heater cannot be red. The PTC heating body consists of a galvanized outer pressing plate, a stainless steel corrugated spring piece, a galvanized inner pressing plate, a single-layer aluminum heat dissipation piece, a PTC heating piece, a double-layer aluminum heat dissipation piece, a nickel-plated copper electrode terminal and a PPS high-temperature plastic electrode sheath.

In a preferred embodiment, an L-shaped chute is formed on the inner periphery of the air outlet 29 of the body 2, an inlet is formed at the vertical end of the L-shaped chute, a switch 26 is formed at the horizontal end of the L-shaped chute, and the switch 26 is activated by the horizontal rotation in the horizontal direction f after the trigger 19 is inserted from the inlet of the L-shaped chute in the vertical direction d. The connection of air-emitting component 1 and somatic part 2 carries out the guiding orientation to and trigger two kinds of mechanical functions of different change over switch 26, simplified with exchanging the operation that still need reset heating unit 3's heating power with different air-emitting component 1, promoted humanized experience, but not use this as the limit.

In a preferred embodiment, the L-shaped sliding slot includes a vertical sliding slot 252 and a horizontal sliding slot 253 that are communicated with each other, the end of the vertical sliding slot 252 is provided with a vertical opening 252, and the end of the horizontal sliding slot 253 is communicated with the switch 26, but not limited thereto.

In a preferred embodiment, the end of the horizontal sliding groove 253 is spatially overlapped with the elastic protrusion area of the switch 26, and the trigger 19 reaching the horizontal end presses the switch 26, but not limited thereto.

In a preferred embodiment, the switch 26 comprises N buttons arranged in the vertical direction, N is larger than or equal to 2, and each button triggers the heating power switching module to switch different heating powers of the heating unit 3; the distances between the triggering members 19 of the N air emitting members 1 and the respective lower ends are different, and after the triggering member 19 of each air emitting member 1 is inserted into the L-shaped sliding groove and rotated, the buttons with different vertical heights are triggered to switch the corresponding heating powers of the heating unit 3, but not limited thereto.

In a preferred embodiment, the heating unit 3 is arranged downstream of the fan 5, the heating unit 3 being connected to the power supply module by a heating power supply circuit arranged only inside the body 2. Under the structure of the invention, the power supply circuit of the air emitting piece 1 and the body part 2 is not needed to be arranged, the air emitting piece 1 can be provided with no circuit, the circuit part of the whole fan is only arranged in the body part 2, and the body part 2 does not need to supply power to the air emitting piece 1, so that the whole circuit is greatly simplified, but not limited to the structure.

In a preferred embodiment, the air flow is emitted to the air emitters 1 through the heating unit 3 in the antigravity direction (X direction), and at least one of the air emitters 1 is a nozzle which receives the air flow heated by the body 2 and directs the air flow to be emitted horizontally, but not limited thereto.

In a variant in which the nozzle comprises a collapsible tube (not shown) that can be extended and retracted in the direction of gravity, the nozzle can be made collapsible in a mechanical way, for example: the sliding structure of the inner pipe and the outer pipe enables the fan to fold and compress the nozzle when not in use, further reducing the volume, but not limited to this.

In a preferred embodiment, the lower end of the air emitting piece 1 is provided with a clamping ring 18 and a plurality of L-shaped clamping jaws 17, an air outlet 29 on the upper surface of the body 2 is provided with a bayonet 21 and an L-shaped clamping groove 22, and after the clamping ring 18 is butted with the bayonet 21 along the vertical direction, the L-shaped clamping jaws 17 are in rotary clamping connection along the L-shaped clamping groove 22 in the horizontal direction, so that the air emitting piece 1 and the air outlet 29 of the body 2 are clamped into a whole, and the mechanical connection of the air emitting piece 1 and the body 2 is realized.

In a preferred embodiment, the body 2 further comprises a filter 6, the filter 6 is located downstream of the air inlet 28 and upstream of the fan 5, the air entering from the air inlet 28 passes through the filter 6 in the anti-gravity direction (X direction) and then enters the fan 5, and an annular air inlet grille 27 for preventing dust is arranged at the air inlet 28, but not limited to this.

In a preferred embodiment, the air inlet 28 is disposed on the bottom surface of the body 2, and sucks air in the direction of counter-gravity (X direction) to a first air collecting chamber 23, and the air in the first air collecting chamber 23 passes through the filter 6 and is sucked into the fan 5 after reaching a second air collecting chamber 24, so that the air inlet 28 is as far away from the nozzle as possible, thereby preventing the air inlet 28 from sucking in heated air flow and ensuring the air supply effect, but not limited thereto.

In a preferred embodiment, the body 2 further comprises a sealing enclosure 20, the sealing enclosure 20 surrounding the blower 5 and the heating unit 3 in a circumferential sealing manner, but not limited thereto.

In a preferred embodiment, a base 7 is further included, and the body 2 is rotatably connected above the base 7, but not limited thereto.

In a preferred embodiment, the air emitting member may be at least one of a porous pipe for warming quilt, a rod for drying shoes, a spray gun for drying hair, and a drying box for drying pet hair, but not limited thereto.

and S110, separating the air emitting piece which is currently connected to the air outlet of the body, and releasing the corresponding switch of the air emitting piece.

And S120, connecting another air emitting piece to the air outlet of the body, and when the other air emitting piece is communicated with the air outlet, triggering another switch by the trigger piece to switch the heating power of the heating unit.

Referring to fig. 5 to 8, a method for using the fan of the present invention, which uses the above fan, includes the following steps: the air-emitting member 1 currently connected to the air outlet 29 of the body 2 is detached (see fig. 5, 6), and the corresponding switch 26 of the air-emitting member 1 is released. Then, another air emitting member (not shown) is connected to the air outlet 29 of the body 2, the other air emitting member may be one of a porous pipe for warming quilt, a rod for drying shoes, a spray gun for drying hair, and a drying box for drying pet hair, and after the new air emitting member is connected to the body 2, another switch 26 is triggered by the trigger 19 of the new air emitting member to switch the heating power of the heating unit 3, so that the automatic switching of the heating power of the fan in different use scenes (changing to warming quilt, drying hair, etc.) is realized. For example: when the air emitting component 1 like a fan nozzle is connected, the trigger component 19 triggers the corresponding switch 26, so that the heating unit 3 works at the maximum power, and the heating effect is enhanced. When the air-emitting part 1 of a spray gun for drying hair is connected, the other switch 26 is triggered by the trigger part 19 with different spacing, so that the heating unit 3 operates at a lower power, preventing burns.

In summary, the present invention is directed to a fan and a method for using the same, which can disassemble an air emitting member and a body, so as to replace different types of air emitting members, and can be adapted to different usage scenarios by connecting air emitting members with different functions.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A fan, comprising:

a body (2) comprising an air inlet (28), an air outlet (29), a fan (5) for generating an air flow, a heating unit (3) for heating the air flow, and a heating power switching module driving the heating unit (3); and

the air emitting part (1) is detachably connected to the air outlet (29) of the body part (2) and used for receiving the air flow heated by the body part (2) and emitting the air flow, at least one trigger part (19) is arranged at the lower end of the air emitting part (1), the trigger part (19) of the air emitting part (1) is different from the lower end of the trigger part, at least one switch (26) electrically connected with the heating power switching module is arranged at the air outlet (29) of the body part (2), and when the air emitting part (1) is connected with the air outlet (29), the trigger part (19) props against the switch (26) to trigger the heating power switching module to switch the heating power of the heating unit (3).

2. The fan according to claim 1, wherein an L-shaped chute is provided at an inner circumference of the air outlet (29) of the body (2), an inlet is provided at a vertical end of the L-shaped chute, the switch (26) is provided at a horizontal end, and the switch (26) is actuated by a horizontal rotation of the actuating member (19) after being inserted from the inlet of the L-shaped chute.

3. The fan as claimed in claim 2, wherein the L-shaped chute comprises a vertical chute (252) and a horizontal chute (253) communicating with each other, the end of the vertical chute (252) is provided with a vertical opening (252), and the end of the horizontal chute (253) communicates with the switch (26).

4. The fan according to claim 3, characterized in that the end of the horizontal chute (253) spatially overlaps with the elastic raised area of the switch (26), the trigger (19) reaching the horizontal end depressing the switch (26).

5. The fan according to claim 2, wherein the switch (26) comprises N buttons arranged in a vertical direction, N ≧ 2, each of which triggers the heating power switching module to switch a different heating power of the heating unit (3);

the distances between the trigger pieces (19) of the N air emitting pieces (1) and the lower ends of the N air emitting pieces are different, and when the trigger piece (19) of each air emitting piece (1) is inserted into the L-shaped sliding groove and rotates, the buttons with different vertical heights are triggered to switch the corresponding heating power of the heating unit (3).

6. The fan as claimed in claim 1, wherein the air emitting member (1) is provided at its lower end with a plurality of L-shaped claws (17), and an air outlet (29) formed at the upper surface of the body (2) is provided with an L-shaped catching groove (22), and the air emitting member (1) is rotatably caught to the air outlet (29) of the body (2).

7. The fan according to claim 1, characterized in that said heating unit (3) is arranged downstream of said fan (5), said heating unit (3) being connected to a power supply module by means of a heating and power supply circuit arranged only inside said body (2), said air flow being emitted in a counter-gravity direction through said heating unit (3) to said air emitters (1), at least one of said air emitters (1) being a nozzle receiving the air flow heated by said body (2) and directing said air flow to emit horizontally.

8. The fan according to claim 1, wherein the body (2) further comprises a filter (6), the filter (6) being located downstream of the air inlet (28) and upstream of the fan (5);

the air inlet (28) is arranged on the bottom surface of the body (2), air is sucked to reach a first air collecting cavity (23) along the antigravity direction, and the air entering from the air inlet (28) passes through the filter (6) along the antigravity direction, then reaches a second air collecting cavity (24) and is sucked into the fan (5).

9. The fan according to claim 1, characterized in that said body (2) further comprises a hermetic casing (20) and a base (7);

the sealing shell (20) surrounds the fan (5) and the heating unit (3) in an annular sealing mode, and the body part (2) is rotatably connected above the base (7).

10. A method of using a fan, using the fan of claim 1, comprising the steps of:

-disengaging the air emitting member (1) currently connected to the air outlet (29) of the body (2), the switch (26) corresponding to the air emitting member (1) being released; and

another air emitting member (1) is connected to an air outlet (29) of the body (2), and another changeover switch (26) is triggered by the trigger member (19) to switch the heat generating power of the heating unit (3) when communicating with the air outlet (29).