CN111829050A

CN111829050A - Warm-air drier

Info

Publication number: CN111829050A
Application number: CN202010715682.XA
Authority: CN
Inventors: 肖彪; 张岩; 李彬; 付山; 李小辉
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2020-10-27

Abstract

The invention relates to a warm air blower, the warm air blower includes: the air conditioner comprises a shell, a fan and a fan, wherein an accommodating cavity is formed inside the shell, and a plurality of air outlets communicated with the accommodating cavity are formed in the shell; the fan is arranged on the shell and comprises a motor and an impeller, and the impeller is connected with the output end of the motor and is positioned in the accommodating cavity; and the heating assembly is arranged in the accommodating cavity around the periphery of the impeller. The fan is used for driving the air current to flow to a plurality of air outlets, and heating element is located between impeller and a plurality of air outlets, like this when a plurality of air outlets of air current flow direction, can pass through heating element and form the hot-blast to blowing to the air outlet to the formation is used for the hot-blast that heats to the indoor environment. A plurality of air outlets are arranged along the ring shape around impeller periphery end to end, have all seted up the air outlet on each direction of shell lateral wall circumference promptly to 360 degrees all-round air-outs from the shell periphery, with the air-out area of increase electric fan heater, make the air supply scope of electric fan heater wider, with heat indoor temperature more evenly, improve thermal cycle efficiency.

Description

Warm-air drier

Technical Field

The invention relates to the technical field of household appliances, in particular to a fan heater.

Background

The warm air blower is a warm air supply device, can be used for heating and dehumidifying in various workshops, and can also be used as a household heater. The working principle is as follows: air enters the unit from the air suction port under the power action of the ventilator, is heated when flowing through the air heater, and flows out of the unit from the air outlet to form warm air which is sent to a heating space and forms indoor air circulation, thereby realizing heating of indoor environment. However, the conventional fan heater is inefficient in thermal cycling.

Disclosure of Invention

In view of the above, there is a need for an air heater that improves the thermal cycling efficiency of the air heater.

A fan heater, the fan heater comprising:

the air conditioner comprises a shell, a fan and a control device, wherein an accommodating cavity is formed inside the shell, and a plurality of air outlets communicated with the accommodating cavity are formed in the shell;

the fan is arranged on the shell and comprises a motor and an impeller, and the impeller is connected with the output end of the motor and is positioned in the accommodating cavity; and

the heating assembly is arranged in the accommodating cavity around the periphery of the impeller;

the fan is used for driving airflow to flow to the air outlets, the heating assembly is located between the impeller and the air outlets, and the air outlets are arranged in an annular shape in an end-to-end mode around the periphery of the impeller.

In the fan heater, the fan is used for driving airflow to flow to the plurality of air outlets, the heating assembly is located between the impeller and the plurality of air outlets, and therefore when the airflow flows to the plurality of air outlets, the airflow can pass through the heating assembly and form hot air blowing to the air outlets, and the hot air used for heating the indoor environment is formed. And, a plurality of air outlets are arranged along the ring shape around impeller periphery end to end, have all seted up the air outlet on the each direction of shell lateral wall circumference promptly to 360 degrees all-round air-outs from the shell periphery, with the air-out area of increase electric fan heater, make the air supply scope of electric fan heater wider, with heat indoor temperature more evenly, improve thermal cycle efficiency, improve the work efficiency of electric fan heater.

In one embodiment, the plurality of air outlets are arranged along a ring around the periphery of the impeller; or

The plurality of air outlets are arranged along a polygonal ring around the periphery of the impeller.

In one embodiment, the impeller is a centrifugal impeller, and the heating assembly comprises a plurality of sub-heating elements arranged along a polygonal ring around the periphery of the impeller; or

The impeller is a centrifugal impeller, and the heating assembly is annularly sleeved on the periphery of the impeller.

In one embodiment, the heating assembly includes two first heating members and two second heating members, the two first heating members are disposed at opposite sides of a radial direction of the impeller at an interval, the two second heating members are disposed between the two first heating members, and the two second heating members are disposed at opposite sides of another radial direction of the impeller at an interval.

In one embodiment, the casing includes base, top cap and annular grid, base and the relative interval setting of top cap, the annular grid connect in the base with between the top cap and enclose and close and form the holding chamber, heating element is located the impeller periphery with between the annular grid, the annular grid has seted up along self circumference a plurality of air outlets.

In one embodiment, the annular grating comprises a plurality of annular rods and a plurality of spiral rods, the annular rods are arranged at intervals along a direction parallel to the axial direction of the impeller, the spiral rods are arranged on the annular rods at intervals along the circumferential direction of the annular rods, and each spiral rod is obliquely arranged relative to the axial direction of the impeller;

wherein the impeller is a centrifugal impeller, and the screw rod is configured to be inclined in a direction in which the base is directed to the top cover, in the same direction as a rotation direction of the impeller.

In one embodiment, the screw rod is configured as an arc rod protruding in a clockwise direction or a counterclockwise direction in a direction in which the base points toward the top cover.

In one embodiment, the base comprises a bottom plate, the bottom plate is in butt joint with one end of the annular grating, which is opposite to the top cover, a containing groove is formed on the bottom plate and is concave towards the containing cavity, the motor is arranged in the containing groove, and the output end of the motor penetrates through the bottom plate to be connected with the impeller in the containing cavity.

In one embodiment, the bottom plate is provided with an air inlet, an air inlet channel located in the accommodating cavity is formed between the air inlet and the impeller, and the side wall of the accommodating cavity is provided with a plurality of heat dissipation holes which are communicated with the air inlet channel.

In one embodiment, the base further includes a first guide plate disposed around the periphery of the bottom plate and extending into the accommodating cavity, the bottom plate is provided with an air inlet, the first guide plate is located between the air inlet and the air outlet, and the first guide plate is disposed along a direction of the base pointing to the top cover and inclined toward the impeller.

In one embodiment, the top cover comprises a cover body and a second flow guide plate, the cover body is in butt joint with one end of the annular grid, which is opposite to the base, and the second flow guide plate is arranged on the periphery of the cover body and extends into the accommodating cavity;

the second guide plate is located the one end of a plurality of air outlets dorsad first guide plate, and follows the top cap is directional the direction of base, the second guide plate is to being close to the impeller slope sets up.

Drawings

FIG. 1 is a schematic view of a fan heater according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of the fan heater of FIG. 1;

FIG. 3 is a schematic view of the internal structure of the fan heater shown in FIG. 1;

fig. 4 is a schematic structural view of the fan heater shown in fig. 1 from another view angle.

100. A warm air blower; 10. a housing; 11. an accommodating cavity; 112. an air inlet; 113. an air inlet channel; 114. an air outlet; 115. an air outlet channel; 12. a base; 121. a base plate; 123. a first baffle; 13. a containing groove; 14. a top cover; 141. a cover body; 143. a second baffle; 15. heat dissipation holes; 16. an annular grid; 161. an annular rod; 163. a screw rod; 30. a fan; 32. a motor; 34. an impeller; 50. a heating assembly; 52. a first heating member; 54. a second heating member.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" 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 such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As described in the background art, the conventional fan heater has low thermal cycle efficiency, and the inventor researches and finds that the root cause of the problem is that most of the conventional fan heaters are single-side air outlet, the air supply range is narrow, the heating temperature of the fan heater is uneven, the indoor temperature cannot be uniformly improved, and further the thermal cycle efficiency is low.

In order to solve the technical problem, an embodiment of the present invention provides a fan heater, which can discharge air in 360 degrees in all directions along a circumferential direction of the fan heater, and has a larger air discharge area, and the fan heater can uniformly transfer heat to an indoor environment from various angles along the circumferential direction, so as to improve heat circulation efficiency and work efficiency of the fan heater.

Referring to fig. 1-2, a fan heater 100 according to an embodiment of the present invention includes a housing 10, a fan 30, and a heating element 50, wherein a receiving cavity 11 is formed inside the housing 10, and a plurality of air outlets 114 communicated with the receiving cavity 11 are formed on the housing 10; the fan 30 is arranged on the shell 10 and comprises a motor 32 and an impeller 34, the impeller 34 is connected with the output end of the motor 32 and is positioned in the accommodating cavity 11, and the heating assembly 50 is arranged in the accommodating cavity 11 around the periphery of the impeller 34; the fan 30 is configured to drive an airflow to flow to the plurality of air outlets 114, and the heating element 50 is located between the impeller 34 and the plurality of air outlets 114, so that when the airflow flows to the plurality of air outlets 114, the airflow passes through the heating element 50 and forms hot air blowing to the air outlets 114, so as to form hot air for heating an indoor environment. And, a plurality of air outlets 114 are arranged along the ring-shaped around impeller 34 periphery end to end, all seted up air outlet 114 on the each direction of shell lateral wall circumference promptly to 360 degrees all-round air-outs from the shell periphery, with the air-out area of increase electric fan heater 100, make electric fan heater 100's air supply scope wider, with heat indoor temperature more evenly, improve thermal cycle efficiency, improve electric fan heater 100's work efficiency.

In some embodiments, the air outlets 114 are arranged along a ring around the periphery of the impeller 34, that is, the air outlets 114 are arranged in a ring around the impeller 34, so as to output air 360 degrees in the entire circumferential direction of the side wall of the casing, thereby increasing the air output range. It is understood that in other embodiments, the plurality of air outlets 114 are arranged along a polygonal ring around the outer periphery of the impeller 34, that is, the plurality of air outlets 114 are arranged in a polygonal ring around the impeller 34, such as a quadrilateral ring, a pentagonal ring, etc., to discharge air 360 degrees from the entire circumferential direction of the sidewall of the casing, so as to increase the air discharge range.

Referring to fig. 3, in some embodiments, impeller 34 is a centrifugal impeller and heating assembly 50 includes a plurality of sub-heating elements arranged in a polygonal ring around the periphery of impeller 34. Thus, the impeller 34 is a centrifugal impeller, and drives the airflow to axially flow in from the impeller 34 and then change the flow direction of the airflow, so that the airflow flows out along the radial direction of the impeller 34, and the impeller 34 blows out the air in the circumferential direction in the rotation process; moreover, the plurality of sub-heating elements are arranged in a polygonal ring with the impeller 34 as the center, radial flowing air flows formed when the impeller 34 rotates can pass through the plurality of sub-heating elements sleeved on the periphery of the impeller 34, the air flows flowing along the radial direction of the impeller 34 can be heated by the heating assembly 50 and then flow out from the plurality of air outlets 114, the air flows flowing out from the periphery of the impeller 34 can be comprehensively and uniformly heated, and then hot air is uniformly discharged from the plurality of air outlets 114.

Further, the heating assembly 50 includes two first heating members 52 and two second heating members 54, the two first heating members 52 are disposed at opposite sides of a radial direction of the impeller 34 at intervals, the two second heating members 54 are disposed between the two first heating members 52, and the two second heating members 54 are disposed at opposite sides of another radial direction of the impeller 34 at intervals; thus, the two first heating members 52 and the two second heating members 54 are enclosed to form a quadrilateral ring sleeved outside the impeller 34, when the impeller 34 rotates to drive the airflow to radially flow out by itself, the airflow around the impeller 34 can uniformly be heated and then flow out through the heating component 50 which is quadrilateral, so that the temperature of the airflow around the impeller 34 is uniformly heated and then uniformly heated from the plurality of air outlets 114 around the shell, and the heat circulation efficiency is further improved.

Specifically, the heating unit 50 includes an upper case and a lower case, which are butted, a plurality of heating members are held between the upper case and the lower case, and a plurality of sub-heating members are held and fixed by cooperation of the upper case and the lower case.

It is understood that in other embodiments, the impeller 34 is a centrifugal impeller, and the heating assembly 50 is disposed around the periphery of the impeller 34 in a circular ring shape; thus, the impeller 34 is a centrifugal impeller, and drives the airflow to axially flow in from the impeller 34 and then change the flow direction of the airflow, so that the airflow flows out along the radial direction of the impeller 34, and the impeller 34 blows out the air in the circumferential direction in the rotation process; moreover, the impeller 34 assembly is arranged as a ring by taking the impeller 34 as a center, radial flowing air flow formed when the impeller 34 rotates can pass through the heating assembly 50 sleeved on the periphery of the impeller 34, the air flow flowing along the radial direction of the impeller 34 can be heated by the heating assembly 50 and then flows out from the plurality of air outlets 114, the air flow flowing out from the plurality of air outlets 34 in the radial direction can be comprehensively and uniformly heated, and then hot air is uniformly discharged from the plurality of air outlets 114.

With reference to fig. 1-2, in some embodiments, the housing 10 includes a base 12, a top cover 14 and an annular grille 16, the base 12 and the top cover 14 are disposed at an interval, the annular grille 16 is connected between the base 12 and the top cover 14 and encloses a receiving cavity 11, so as to enclose the impeller 34 and the heating element 50 in the receiving cavity 11 enclosed by the annular grille 16, the base 12 and the top cover 14, and the heating element 50 is located between the periphery of the impeller 34 and the annular grille 16, and the annular grille 16 is circumferentially provided with a plurality of air outlets 114, so that the plurality of air outlets 114 are circumferentially arranged along the annular grille 16, and hot air formed in the receiving cavity 11 is discharged from each circumferential direction of the annular grille 16 through the plurality of air outlets 114 on the annular grille 16, thereby increasing the air outlet range of the exhaust air, and enabling the air heater 100 to uniformly heat the indoor temperature by 360 degrees.

Further, the annular grille 16 includes a plurality of annular rods 161 and a plurality of spiral rods 163, the plurality of annular rods 161 are arranged at intervals along a direction parallel to the axial direction of the impeller 34, the plurality of spiral rods 163 are arranged on the plurality of annular rods 161 at intervals along the circumferential direction of the annular rods 161, which is equivalent to that the plurality of annular rods 161 and the plurality of spiral rods 163 are cross-connected to construct the annular grille 16 having the plurality of air outlets 114, so that air flow is allowed to be discharged from each direction of the circumferential direction of the annular grille 16, and the work efficiency of the fan heater 100 is improved.

Also, the impeller 34 is a centrifugal impeller that entrains the air flow to flow out from the tangential direction of the impeller 34, and the screw 163 is configured to have an inclined direction in the direction in which the base 12 is directed to the top cover 14, in the same direction as the rotation direction of the impeller 34. For example, the projection of the rotation direction of the impeller 34 toward the base 12 is clockwise, and the screw 163 is disposed to be inclined clockwise in the direction of the base 12 toward the top cover 14, so that the inclination direction of the screw 163 is consistent with the rotation direction of the impeller 34, the impact between the air flow flowing out from the impeller 34 and the screw 163 is reduced, the resistance and noise when the air flow passes through the annular grille 16 are reduced, and the rotation noise is effectively avoided. Or, the projection of the rotation direction of the impeller 34 towards the base 12 is in the counterclockwise direction, and the screw rod 163 is arranged in the counterclockwise inclined manner in the direction of the base 12 towards the top cover 14, so that the inclined direction of the screw rod 163 is consistent with the rotation direction of the impeller 34, the impact between the air flow flowing out of the impeller 34 and the screw rod 163 is reduced, the resistance and noise when the air flow passes through the annular grating 16 are reduced, and the rotation noise is effectively avoided.

Further, in the direction of the base 12 pointing to the top cover 14, the screw rod 163 is configured as an arc rod protruding towards the clockwise direction or the counterclockwise direction, so that the screw rod 163 is disposed in an arc shape, which reduces the direct impact of the air flow from the screw rod 163 and the air outlet 114, and further reduces the air exhaust noise.

Referring to fig. 2 and 4, in some embodiments, the base 12 includes a bottom plate 121, the bottom plate 121 is abutted to an end of the annular grid 16 opposite to the top cover 14, a containing groove 13 is formed on the bottom plate 121 and recessed toward the containing cavity 11, the electrode is disposed in the containing groove 13, and an output end of the electrode passes through the bottom plate 121 and is connected to the impeller 34 in the containing cavity 11. Equivalently, a containing groove 13 is formed outside the containing cavity 11, and the electrode is assembled in the containing groove 13 to be separated from the containing cavity 11, so that the normal work of the electrode is prevented from being influenced by hot air in the containing cavity 11. Moreover, the containing groove 13 is formed by the concave bottom plate 121, and after the motor 32 is assembled in the containing groove 13, the motor does not excessively protrude out of the bottom surface where the bottom plate 121 is located, so that the overall height of the fan heater 100 from the base 12 to the top cover 14 can be reduced.

Further, the bottom plate 121 is provided with an air inlet 112, an air inlet channel located in the accommodating cavity 11 is formed between the air inlet 112 and the impeller 34, and when the impeller 34 rotates and works, the air flow is driven to enter the air inlet channel from the air inlet 112 and finally flow to the air outlet 114 from the impeller 34. Moreover, the side wall of the containing groove 13 is provided with a plurality of heat dissipation holes 15, a plurality of heat dissipation holes 15 and an air inlet channel, so that heat generated during the working of the motor 32 in the containing groove 13 can be dissipated to the air inlet channel through the heat dissipation holes 15, the motor 32 can be cooled, and the phenomenon that the motor 32 generates too much heat during the working to influence the service life of the motor is prevented.

Furthermore, the base 12 further includes a first baffle 123 disposed around the periphery of the bottom plate 121 and extending into the accommodating cavity 11, the bottom plate 121 is provided with an air inlet 112, the first baffle 123 is located between the air inlet 112 and the air outlet 114, and the first baffle 123 is disposed along the direction of the base 12 toward the top cover 14 and inclined toward the impeller 34. Thus, the first baffle 123 separates the air inlet 112 and the air outlet 114 in the accommodating cavity 11, so that the air inlet and the air outlet are not affected by each other. Moreover, the first guide plate 123 is disposed in an inclined manner toward the impeller 34 in a direction in which the bottom cover points to the top cover 14, which is equivalent to that the first guide plate 123 is disposed in a radial direction from the center to the periphery of the impeller 34 and gradually inclined downward toward the base 12 to form an air outlet channel 115 which is gradually enlarged, so as to increase an air outlet area of hot air, improve air outlet efficiency, and facilitate indoor thermal circulation.

Furthermore, the top cover 14 includes a cover 141 and a second flow guiding plate 143, the cover 141 is abutted with an end of the annular grille 16 facing away from the base 12, and the second flow guiding plate 143 is disposed on the periphery of the cover 141 and extends into the accommodating cavity 11; the second guide plate 143 is located at a first end of the plurality of air outlets 114 opposite to the first guide plate 123, which is equivalent to that the first guide plate 123 and the second guide plate 143 are located at two opposite ends of the plurality of air outlets 114 along the axial direction of the parallel impeller 34, and the first guide plate 123 and the second guide plate 143 enclose to form an air outlet channel 115 communicated with the plurality of air outlets 114. In addition, along the direction in which the top cover 14 points to the base 12, the second guide plate 143 is inclined toward the impeller 34, which is equivalent to the second guide plate 143 being inclined upward from the center to the periphery of the impeller 34, so as to further form the gradually enlarged air outlet channel 115, which is equivalent to the air outlet channel 115 with the splayed cross section, thereby increasing the air outlet area of the hot air, improving the air outlet efficiency, and facilitating the indoor thermal cycle.

Specifically, in this embodiment, an air inlet channel 113 located between the first guide plate 123 and the bottom plate 121 is formed in the accommodating cavity 11, the air inlet channel 113 is communicated with an axial end portion of the impeller 34, an air outlet channel 115 located between the first guide plate 123 and the second guide plate 143 is further formed in the accommodating cavity 11, and the air outlet channel 115 is communicated with a radial periphery of the impeller 34. Thus, when the impeller 34 rotates to work, the air flow is driven to enter the air along the axial direction of the impeller 34 through the air inlet channel 113, then the air flow is driven to exit the air along the tangential direction of the impeller 34 through the air outlet channel 115, and finally the air flow at the periphery of the impeller 34 is allowed to exit from the plurality of air outlets 114 so as to heat the indoor air from all directions of the annular grating 16, so that the indoor temperature can be uniformly increased, the problem of uneven heating of the warm air level is solved, and the working efficiency of the fan heater 100 is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A fan heater, characterized in that, the fan heater includes:

the air conditioner comprises a shell (10), wherein an accommodating cavity (11) is formed inside the shell (10), and a plurality of air outlets (114) communicated with the accommodating cavity (11) are formed in the shell (10);

the fan (30) is arranged on the shell (10) and comprises a motor (32) and an impeller (34), and the impeller (34) is connected with the output end of the motor (32) and is positioned in the accommodating cavity (11); and

the heating assembly (50) is arranged in the accommodating cavity (11) around the periphery of the impeller (34);

the fan (30) is used for driving airflow to flow to the air outlets (114), the heating assembly (50) is located between the impeller (34) and the air outlets (114), and the air outlets (114) are annularly arranged end to end around the periphery of the impeller (34).

2. The fan heater according to claim 1, characterised in that said plurality of air outlets (114) are arranged along a ring around the periphery of said impeller (34); or

The air outlets (114) are arranged along a polygonal ring around the periphery of the impeller (34).

3. The fan heater according to claim 1 or 2, characterized in that said impeller (34) is a centrifugal impeller (34), said heating assembly (50) comprising a plurality of sub-heating elements arranged in a polygonal ring around the periphery of said impeller (34); or

The impeller (34) is a centrifugal impeller (34), and the heating component (50) is annularly sleeved on the periphery of the impeller (34).

4. The fan heater according to claim 3, wherein the heating assembly (50) comprises two first heating members (52) and two second heating members (54), the two first heating members (52) being relatively spaced apart on opposite sides of a radial direction of the impeller (34), the two second heating members (54) being located between the two first heating members (52), and the two second heating members (54) being relatively spaced apart on opposite sides of another radial direction of the impeller (34).

5. The fan heater according to claim 1 or 2, wherein the casing (10) comprises a base (12), a top cover (14) and an annular grille (16), the base (12) and the top cover (14) are oppositely arranged at intervals, the annular grille (16) is connected between the base (12) and the top cover (14) and encloses the accommodating cavity (11), the heating assembly (50) is located between the periphery of the impeller (34) and the annular grille (16), and the annular grille (16) is circumferentially provided with the plurality of air outlets (114).

6. The fan heater according to claim 5, wherein the annular grille (16) comprises a plurality of annular rods (161) and a plurality of spiral rods (163), the plurality of annular rods (161) are arranged at intervals along a direction parallel to the axial direction of the impeller (34), the plurality of spiral rods (163) are arranged on the plurality of annular rods (161) at intervals along the circumferential direction of the annular rods (161), and each spiral rod (163) is arranged obliquely with respect to the axial direction of the impeller (34);

wherein the impeller (34) is a centrifugal impeller (34), and the screw rod (163) is configured to be inclined in a direction in which the base (12) is directed toward the top cover (14), in the same direction as a rotation direction of the impeller (34).

7. The fan heater according to claim 6, characterised in that the screw lever (163) is configured as an arc-shaped lever which protrudes in a clockwise direction or in a counterclockwise direction in the direction of the base (12) directed towards the top cover (14).

8. The fan heater according to claim 6, wherein the base (12) comprises a bottom plate (121), the bottom plate (121) is abutted against one end of the annular grating (16) facing away from the top cover (14), a containing groove (13) is formed on the bottom plate (121) and faces inwards to the containing cavity (11), the motor (32) is arranged in the containing groove (13), and the output end of the motor (32) penetrates through the bottom plate (121) and is connected with the impeller (34) in the containing cavity (11).

9. The fan heater according to claim 8, wherein the bottom plate (121) is provided with an air inlet (112), an air inlet channel located in the accommodating cavity (11) is formed between the air inlet (112) and the impeller (34), the side wall of the accommodating cavity (13) is provided with a plurality of heat dissipation holes (15), and the heat dissipation holes (15) are communicated with the air inlet channel.

10. The fan heater according to claim 8, wherein the base (12) further includes a first baffle (123) disposed around the periphery of the bottom plate (121) and extending into the accommodating cavity (11), an air inlet (112) is disposed on the bottom plate (121), the first baffle (123) is located between the air inlet (112) and the air outlet (114), and the first baffle (123) is disposed along a direction of the base (12) toward the top cover (14) and inclined toward the impeller (34).

11. The fan heater according to claim 10, wherein the top cover (14) comprises a cover body (141) and a second flow guiding plate (143), the cover body (141) is abutted with one end of the annular grille (16) opposite to the base (12), and the second flow guiding plate (143) is arranged on the periphery of the cover body (141) and extends into the accommodating cavity (11);

the second guide plate (143) is located at one end, back to the first guide plate (123), of the plurality of air outlets (114), and the second guide plate (143) is obliquely arranged close to the impeller (34) along the direction in which the top cover (14) points to the base (12).