Heater

Abstract

The present invention relates to a heater, comprising: a shell, an airflow cavity formed in the shell, the airflow cavity comprising a plurality of sub-airflow cavities formed by separation; the shell having an air inlet area and an air outlet area, a plurality of groups of air inlets are provided in the air inlet area, the air outlet area comprises a plurality of sub-air outlet areas arranged in a ring shape along the circumference of the shell, at least one group of air outlets is provided in each sub-air outlet area, a fan assembly comprises a plurality of fans, at least one fan is provided in each sub-airflow cavity; a heating element is extended in a direction passing through each sub-airflow cavity; each sub-airflow cavity is connected to at least one group of air inlets, each sub-airflow cavity is connected to at least one group of air outlets, and the heating element is located between each group of mutually connected air inlets and air outlets. By delivering hot air to the plurality of sub-air outlet areas on the circumference of the entire shell through a plurality of forced convection airflows, the air outlet volume can be matched with the air outlet range, sufficient airflow volume is provided for the entire circumference of the shell, and the overall heating effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of household appliances, in particular to a fan heater. Background Art

[0002] A fan heater is a warm air supply device that can be used for heating and dehumidification in various types of workshops, and can also be used as a home heater. Its working principle is: under the power of the fan, air enters the unit from the air inlet, is heated when it flows through the air heating element, and flows out of the unit from the air outlet to form warm air, which is sent to the heating space and forms indoor air circulation, thereby achieving heating of the indoor environment. However, traditional fan heaters have limited air output and poor heating performance. Summary of the invention

[0003] Aiming at the problem that traditional air heaters have poor heating performance, the present invention proposes an air heater which can achieve a technical effect of better heating performance.

[0004] A fan heater, comprising:

[0005] A shell, wherein an airflow cavity is formed in the shell, wherein the airflow cavity includes a plurality of sub-airflow cavities formed by being separated; and the shell has an air inlet area and an air outlet area, wherein a plurality of groups of air inlets are provided in the air inlet area, and the air outlet area includes a plurality of sub-air outlet areas arranged in a ring along the circumference of the shell, wherein each sub-air outlet area is provided with at least one group of air outlets,

[0006] A fan assembly, comprising a plurality of fans, at least one of which is disposed in each of the sub-airflow chambers; and

[0007] A heating element, the heating element is extended and arranged along a direction passing through each of the sub-airflow chambers;

[0008] Wherein, each sub-airflow cavity is connected to at least one group of air inlets, and each sub-airflow cavity is connected to at least one group of air outlets, and the heating element is located between each group of the interconnected air inlets and the air outlets.

[0009] In the above-mentioned heater, each sub-airflow cavity is provided with a fan and at least part of the heating element. When multiple fans are working, multiple airflows can be formed to flow through multiple sub-airflow cavities, and then hot air can be discharged from multiple sub-airflow cavities. As a whole, hot air with a large air volume can be formed, and the heating effect is better. In addition, each sub-airflow cavity is connected to one or more groups of air inlets, and each sub-airflow cavity is connected to one or more groups of air outlets. In this way, when the fan in each sub-airflow cavity is working, multiple airflow paths passing through each sub-airflow cavity can be formed. At the same time, each airflow path passes through the heating element to heat the airflow flowing from the air inlet to the air outlet, and finally form hot air discharged from multiple sub-airflow cavities. At the same time, multiple sub-air outlet areas are arranged in a ring along the circumference of the shell, and at least one group of air outlets is opened in each sub-air outlet area. In this way, air is discharged from multiple sub-air outlet areas on the entire circumference of the shell. The heating range of the heater is the entire circumference of the shell, which is equivalent to discharging air from a 360-degree range of the circumference of the shell. The heating range is wider, and the heating performance is further improved.

[0010] In addition, a plurality of sub-airflow cavities corresponding to and connected to the plurality of sub-air outlet areas are formed inside the shell, and the plurality of sub-air outlet areas are arranged along the circumference of the shell, so as to utilize fans in the corresponding sub-airflow cavities to form a plurality of forced convection heating paths, and use a plurality of forced convection airflows to transport hot air to the plurality of sub-air outlet areas on the circumference of the entire shell, so that the air outlet volume and the air outlet range can be matched, thereby providing sufficient airflow for the entire circumference of the shell, and the overall heating effect is better.

[0011] In one embodiment, each of the sub-airflow chambers includes an air duct and a main cavity, each of the air ducts is provided with the fan, the main cavity is communicated with the air duct, and the heating element is located in the main cavity;

[0012] Wherein, the air inlet is connected to the air duct, and the air outlet is connected to the main cavity.

[0013] In one embodiment, the shell includes a base, an air outlet grille, a top cover and a partition. The air outlet grille is arranged in a ring shape and connected between the base and the top cover. The base, the air outlet grille and the top cover enclose the airflow cavity. The partition is arranged in the airflow cavity to separate the multiple sub-airflow cavities. The air outlet grille is provided with the multiple groups of air outlets arranged along its own circumference and respectively connected to the multiple sub-airflow cavities.

[0014] In one embodiment, a plurality of mutually independent air ducts are formed inside the base, and a plurality of main cavities are enclosed between the air outlet grille, the top cover and the partition plate;

[0015] The heating element is arranged around the inner circumference of the air outlet grille and passes through each of the main cavities; an air outlet connecting the air duct and the main cavity is opened on the base, and the air outlet is located between the partition and the heating element.

[0016] In one of the embodiments, the base has a bottom wall opposite to the top cover and a side wall intersecting with the bottom wall, and the side wall is provided with a plurality of groups of air inlets respectively connected with a plurality of the air ducts.

[0017] In one embodiment, the air duct extends in an arc shape between the air inlet and the air outlet, and a plurality of the air ducts are symmetrically arranged relative to the center of the base.

[0018] In one of the embodiments, a mounting groove is formed on a side of the base facing the main cavity, one end of the heating element is clamped in the mounting groove, and the other end of the heating element extends into the main cavity.

[0019] In one of the embodiments, the air outlet grille is constructed as a polygonal ring, and the heating element includes a plurality of sub-heating elements, and the plurality of sub-heating elements are respectively arranged corresponding to each side surface of the polygonal ring.

[0020] In one embodiment, the air outlet grille includes a first air outlet grille, a second air outlet grille, a third air outlet grille and a fourth air outlet grille, and the first air outlet grille, the second air outlet grille, the third air outlet grille and the fourth air outlet grille are sequentially connected end to end to form a quadrilateral ring;

[0021] The heating element includes four sub-heating elements, and the four sub-heating elements are respectively arranged in the air flow cavity corresponding to the first air outlet grille, the second air outlet grille, the third air outlet grille and the fourth air outlet grille.

[0022] In one embodiment, the air outlet grille is in the form of a circular ring, and the heating element is constructed as a circular ring sleeved inside the air outlet grille.

[0023] In one embodiment, any one of the plurality of fans can be selectively turned on or off. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a heater in one embodiment of the present invention;

[0025] Figure 2 for Figure 1 A cross-sectional view of the heater in one direction is shown;

[0026] Figure 3 for Figure 1 A cross-sectional view of the heater in another direction;

[0027] Figure 4 for Figure 1 A schematic diagram of a part of the structure of the base of the heater shown;

[0028] Figure 5 for Figure 1 Another part of the structural diagram of the base of the heater is shown.

[0029] 100. heater; 10. housing; 11. airflow cavity; 112. sub-airflow cavity; 113. air inlet; 114. air duct; 115. air outlet; 116. main cavity; 12. base; 121. mounting slot; 123. card slot; 13. air outlet; 14. air outlet grille; 141. first air outlet grille; 143. second air outlet grille; 145. third air outlet grille; 147. fourth air outlet grille; 16. top cover; 161. matching slot; 18. partition; 30. fan assembly; 32. fan; 50. heating element; 52. sub-heating element. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0036] Figure 1 A schematic structural diagram of a heater 100 in one embodiment of the present invention is shown; Figure 2 Shows Figure 1 A cross-sectional view of the heater 100 is shown.

[0037] See also Figure 1 A heater 100 provided in one embodiment of the present invention includes a shell 10, a fan assembly 30 and a heating element 50. The fan assembly 30 and the heating element 50 are both arranged in the shell 10. The fan assembly 30 drives the air flow to flow through the inside of the shell 10. The heating element 50 is located on the flow path of the air flow and can heat the air flow to finally form hot air blown out of the shell 10 for heating the indoor space.

[0038] An airflow cavity 11 is formed in the housing 10. The airflow cavity 11 includes a plurality of sub-airflow cavities 112 that are separated. The fan assembly 30 includes a plurality of fans 32. At least one fan 32 is disposed in each sub-airflow cavity 112. The heating element 50 is extended along the direction passing through each sub-airflow cavity 112. In other words, a fan 32 and at least part of the heating element 50 are disposed in each sub-airflow cavity 112. When the plurality of fans 32 are in operation, a plurality of airflows passing through the plurality of sub-airflow cavities 112 can be formed, and hot air can be discharged from the plurality of sub-airflow cavities 112. As a whole, hot air with a large air volume can be formed, and the heating effect is better.

[0039] In addition, the shell 10 has an air inlet area and an air outlet area. The air inlet area is provided with multiple groups of air inlets 113, and each sub-air flow cavity 112 is connected to at least one group of air inlets 113; the air outlet area includes multiple sub-air outlet areas arranged in a ring shape along the circumference of the shell 10, and each sub-air outlet area is provided with at least one group of air outlets 115, and each sub-air flow cavity 112 is connected to at least one group of air outlets 115, and the heating element 50 is located between each group of interconnected air inlets 113 and air outlets 115. It is equivalent to that each sub-airflow cavity 11 is connected with one or more groups of air inlets 113, and each sub-airflow cavity 113 is connected with one or more groups of air outlets 115. In this way, when the fan 32 in each sub-airflow cavity 113 is working, multiple airflow paths passing through each sub-airflow cavity 113 can be formed. At the same time, each airflow path passes through the heating element 50, and the heating element 50 heats the airflow flowing from the air inlet 113 to the air outlet 115, and finally forms hot air discharged from multiple sub-airflow cavities 112. At the same time, multiple sub-air outlet areas are arranged in a ring along the circumference of the shell 10, and at least one group of air outlets 115 is opened in each sub-air outlet area. In this way, air is discharged from multiple sub-air outlet areas on the entire circumference of the shell 10. The heating range of the heater 100 is the entire circumference of the shell 10, which is equivalent to exhausting air from a 360-degree range of the circumference of the shell 10. The heating range is wider, and the heating performance is further improved.

[0040] In addition, a plurality of sub-airflow cavities 112 corresponding to and connected to the plurality of sub-air outlet areas are formed inside the shell 10, and the plurality of sub-air outlet areas are arranged along the circumference of the shell, so as to utilize the fans 32 in the corresponding sub-airflow cavities 112 to form a plurality of forced convection heating paths, and by using a plurality of forced convection airflows to transport hot air to the plurality of sub-air outlet areas on the circumference of the entire shell, the air outlet volume can be matched with the air outlet range, thereby providing a sufficient airflow volume for the entire circumference of the shell 10, and the overall heating effect is better.

[0041] It can be understood that a group of air inlets 113 is a plurality of air inlets 113 gathered together, and each group of air inlets 113 includes a plurality of air inlets 113 ; a group of air outlets 115 is a plurality of air outlets 115 gathered together, and each group of air outlets 115 includes a plurality of air outlets 115 .

[0042] Furthermore, each sub-airflow cavity 112 includes an air duct 114 and a main cavity 116, a fan 32 is arranged in each air duct 114, the main cavity 116 is connected to the air duct 114, and the heating element 50 is located in the main cavity 116; wherein the air inlet 113 is connected to the air duct 114, and the air outlet 115 is connected to the main cavity 116. In this way, the fan 32 and the heating element 50 are arranged in two spaces, and when the fan 32 works in the air duct 114, the external air is sucked into the air duct 114 from the air inlet 113, and then the air flow is transported to the main cavity 116 to contact with the heating element 50 to absorb heat, and then form hot air discharged from the air outlet 115. In this way, the fan 32 and the heating element 50 are arranged separately, and the two will not affect each other during the installation and design process, and the air flow can be completely introduced into the main cavity 116 for heating through the guidance of the air duct 114, thereby improving the overall heating performance of the heater 100.

[0043] In some embodiments, the housing 10 includes a base 12, an air outlet grille 14, a top cover 16, and a partition 18. The air outlet grille 14 is arranged in an annular shape and connected between the base 12 and the top cover 16. The base 12, the air outlet grille 14, and the top cover 16 enclose an airflow cavity 11. The partition 18 is arranged in the airflow cavity 11 to separate and form a plurality of sub-airflow cavities 112. The air outlet grille 14 is provided with a plurality of groups of air outlets 115 arranged along its own circumference and respectively connected to the plurality of sub-airflow cavities 112. In this way, the base 12, the air outlet grille 14, and the partition 18 enclose a plurality of sub-airflow cavities 112, and the plurality of sub-airflow cavities 112 are separated by the partition 18, so as to prevent the fans 32 in the plurality of sub-airflow cavities 112 from causing airflow turbulence when working at the same time, and ensure that the heat can be blown out stably. Moreover, the air outlet grille 14 is annular, and has multiple groups of air outlets 115 connected to multiple sub-airflow chambers 112 along its circumference. The air outlet grille 14 is configured to discharge air from various reverse directions of its circumference, which can increase the air outlet range. It can be understood that the air outlet grille 14 can be set to a circular ring or a polygonal ring structure, and the specific shape of the ring structure is not limited here.

[0044] Specifically, a plurality of independent air ducts 114 are formed inside the base 12, and the air outlet grille 14, the top cover 16 and the partition 18 enclose a plurality of main cavities 116; the heating element 50 is arranged around the inner circumference of the air outlet grille 14 and passes through each main cavity 116, and an air outlet 13 connecting the air duct 114 and the main cavity 116 is opened on the base 12. It is equivalent to forming an air duct 114 inside the base 12, forming a main cavity 116 inside the air outlet grille 14, and the air duct 114 and the main cavity 116 are connected through the air outlet 13, so as to form a complete sub-airflow cavity 112 for guiding the airflow. In addition, the plurality of air ducts 114 and the plurality of main cavities 116 are connected to each other through the air outlet 13 to form a plurality of sub-airflow cavities 112. At the same time, the air outlet 13 is located between the partition 18 and the heating element 50 , so that the airflow in the air duct 114 that passes through the air outlet 13 and enters the main cavity 116 first passes through the heating element 50 and then is discharged from the air outlet 13 .

[0045] Optionally, the air outlet 13 is arranged close to the partition 18 and away from the heating element 50. After the airflow flows out of the air duct 114, it has a longer flow path to stay at the air outlet 115, so that the air flow in the main cavity 116 is relatively sufficient.

[0046] Specifically, a mounting groove 121 is provided on one surface of the base 12 facing the main cavity 116, one end of the heating element 50 is clamped in the mounting groove 121, and the other end of the heating element 50 extends into the main cavity 116. In this way, the heating element 50 is clamped and fixed by the mounting groove 121 on the base 12, which facilitates the assembly and replacement of the heating element 50.

[0047] Furthermore, the base 12 is also provided with a card slot 123, and the top cover 16 is provided with a matching slot 161, and the opposite ends of the partition 18 are respectively assembled in the card slot 123 and the matching slot 161, so that the partition 18 is fixedly assembled between the base 12 and the top cover 16, and the airflow chamber 11 is divided into a plurality of sub-airflow chambers 112. Optionally, the top cover 16 includes an upper cover and an upper crossbeam provided on the inner surface of the upper cover, and the upper crossbeam is provided with a matching slot 161 communicating with the airflow chamber 11, so that the partition 18 is limited and fixed by the matching slot 161.

[0048] In some embodiments, the base 12 has a bottom wall relative to the top cover 16 and a side wall intersecting with the bottom wall, and a plurality of groups of air inlets 113 are provided on the side wall, which are respectively connected to a plurality of air ducts 114, so that air is introduced from the side of the base 12, and the air is introduced more smoothly. Optionally, the air duct 114 extends in an arc shape between the air inlet 113 and the air outlet 13, and the plurality of air ducts 114 are arranged relative to the center of the base 12, so that the plurality of air ducts 114 are evenly distributed on the base 12 to evenly convey the airflow, and the air duct 114 is curved, so that the airflow smoothly turns from the air inlet 113 on the side of the base 12 to the air outlet 13 on the top surface of the base 12 in the air duct 114 and flows out.

[0049] Specifically in this embodiment, the air outlet grille 14 is constructed as a polygonal ring, and the heating element 50 includes a plurality of sub-heating elements 52, which are respectively arranged corresponding to each side of the multi-deformable ring. Each side of the air outlet grille 14 has a corresponding sub-heating element 52 to heat the airflow at the corresponding position, and the airflow at each position of the air outlet grille 14 can be heated. In addition, the air outlet grille 14 itself is a polygonal ring, and can exhaust air from all directions in the circumferential direction.

[0050] Furthermore, the air outlet grille 14 includes a first air outlet grille 141, a second air outlet grille 143, a third air outlet grille 145 and a fourth air outlet grille 147, and the first air outlet grille 141, the second air outlet grille 143, the third air outlet grille 145 and the fourth air outlet grille 147 are connected to form a quadrilateral ring; the heating element 50 includes four sub-heating elements 52, and the four sub-heating elements 52 are respectively arranged in the air flow cavity 11 corresponding to the first air outlet grille 141, the second air outlet grille 143, the third air outlet grille 145 and the fourth air outlet grille 147, and the airflow flowing to each side of the air outlet grille 14 is heated by the four sub-heating elements 52.

[0051] Furthermore, the sub-airflow chamber 112 and the fan 32 each include two, and the partition plate 18 is arranged between the first air outlet grille 141 and the third air outlet grille 145, or the partition plate 18 is arranged between the second air outlet grille 143 and the fourth air outlet grille 147. Forced convection in two directions is formed by the two fans 32, and the air outlet volume and air outlet area are improved in combination with the radiation of the four side sub-heating elements 52, thereby improving the overall heating effect of the heater 100.

[0052] It is understandable that in some embodiments, the air outlet grille 14 is in the shape of a circular ring, and the heating element 50 is constructed as a circular ring sleeved in the air outlet grille 14. Equivalently, the air outlet grille 14 and the heating element 50 are both in the shape of a circular ring, and the heating element 50 is sleeved in the air outlet grille 14, so as to discharge warm air from all directions of the circumference of the air outlet grille 14, thereby increasing the air outlet range. It is also understandable that in some embodiments, the air outlet grille 14 is in the shape of a circular ring, and the heating element 50 is constructed as a polygonal ring sleeved in the air outlet grille 14, and the airflow flowing to all directions of the air outlet grille 14 can also be heated by the polygonal ring. The specific shapes of the air outlet grille 14 and the heating element 50 are not limited here.

[0053] In any of the above embodiments, any one of the multiple fans 32 can be selectively turned on or off, and the user can select to turn on at least some or all of the multiple fans 32 according to needs, and can adjust the air outlet direction according to needs. In addition, each fan 32 can be provided with multiple windshields, and the windshield of the fan 32 can be adjusted to change the size of the air outlet and control the air supply distance. There are many options, which can provide users with a better heating experience.

[0054] The heater 100 provided by the present invention comprises a housing 10, a plurality of fans 32 and a plurality of sub-heating elements 52. A plurality of sub-airflow chambers 112 are formed inside the housing 10. A plurality of fans 32 are respectively arranged in the plurality of sub-airflow chambers 112, and a plurality of sub-heating elements 52 are also arranged in the plurality of sub-airflow chambers 112. The housing 10 is provided with air inlets 113 and air outlets 115 which are both connected to the sub-airflow chambers 112, and a plurality of groups of air outlets 115 which are respectively connected to the plurality of sub-airflow chambers 112 are arranged in a ring shape. In this way, when the fans 32 in each sub-airflow chamber 112 are working, airflows in multiple directions can be formed, and sufficient airflow can be provided for the air outlets 115 in multiple directions, thereby improving the effect of warm air discharge. In addition, a plurality of sub-airflow chambers 112 corresponding to and connected to the plurality of groups of air outlets 115 are formed inside the shell, and the plurality of sub-airflow chambers 112 are arranged along the circumference of the shell, so as to utilize the fans 32 in the corresponding sub-airflow chambers 112 to form a plurality of forced convection heating paths, and by using a plurality of forced convection airflows to transport hot air to the plurality of groups of air outlets 115 in the entire circumference, the air outlet volume can be matched with the air outlet range, thereby providing a sufficient airflow volume for the entire circumference of the shell, and the overall heating effect is better.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fan heater, characterized in that: The heater comprises: A shell (10), wherein an airflow cavity (11) is formed in the shell (10), and the airflow cavity (11) comprises a plurality of sub-airflow cavities (112) separated from each other; the shell (10) comprises an air inlet area and an air outlet area, wherein a plurality of groups of air inlets (113) are provided in the air inlet area, and the air outlet area comprises a plurality of sub-air outlet areas arranged in a ring shape along the circumference of the shell (10), and each of the sub-air outlet areas is provided with at least one group of air outlets (115); A fan assembly (30) comprising a plurality of fans (32), wherein at least one fan (32) is disposed in each of the sub-airflow chambers (112); and a heating element (50), the heating element (50) being arranged to extend in a direction passing through each of the sub-airflow chambers (112); Each of the sub-airflow chambers (112) is in communication with at least one group of the air inlets (113), and each of the sub-airflow chambers (112) is in communication with at least one group of the air outlets (115), and the heating element (50) is located between each group of the air inlets (113) and the air outlets (115) that are in communication with each other; The shell (10) comprises a base (12), an air outlet grille (14), a top cover (16) and a partition (18); the air outlet grille (14) is arranged in an annular shape and connected between the base (12) and the top cover (16); the base (12), the air outlet grille (14) and the top cover (16) enclose the airflow cavity (11); the partition (18) is arranged in the airflow cavity (11) to separate the plurality of sub-airflow cavities (112); the air outlet grille (14) is provided with a plurality of groups of air outlets (115) arranged along its own circumference and respectively connected to the plurality of sub-airflow cavities (112); and the heating element (50) is arranged around the inner circumference of the air outlet grille (14).

2. The air heater according to claim 1, characterized in that: Each of the sub-airflow chambers (112) comprises an air duct (114) and a main cavity (116), the fan (32) being disposed in each of the air ducts (114), the main cavity (116) being communicated with the air duct (114), and the heating element (50) being located in the main cavity (116); The air inlet (113) is in communication with the air duct (114), and the air outlet (115) is in communication with the main cavity (116).

3. The air heater according to claim 2, characterized in that: A plurality of mutually independent air ducts (114) are formed inside the base (12); a plurality of main cavities (116) are enclosed between the air outlet grille (14), the top cover (16) and the partition plate (18); The heating element (50) is arranged around the inner circumference of the air outlet grille (14) and passes through each of the main cavities (116); an air outlet (13) connecting the air duct (114) and the main cavity (116) is provided on the base (12); the air outlet (13) is located between the partition plate (18) and the heating element (50).

4. The air heater according to claim 3, characterized in that: The base (12) comprises a bottom wall opposite to the top cover (16) and a side wall intersecting and connected to the bottom wall, and the side wall is provided with a plurality of groups of air inlets (113) respectively connected to a plurality of air ducts (114).

5. The air heater according to claim 4, characterized in that: The air duct (114) extends in an arc shape between the air inlet (113) and the air outlet (13), and a plurality of the air ducts (114) are symmetrically arranged relative to the center of the base (12).

6. The air heater according to claim 3, characterized in that: A mounting groove (121) is provided on a surface of the base (12) facing the main cavity (116); one end of the heating element (50) is clamped in the mounting groove (121), and the other end of the heating element (50) extends into the main cavity (116).

7. The air heater according to claim 1, characterized in that: The air outlet grille (14) is constructed as a polygonal ring, and the heating element (50) comprises a plurality of sub-heating elements (52), wherein the plurality of sub-heating elements (52) are respectively arranged corresponding to each side surface of the polygonal ring.

8. The air heater according to claim 7, characterized in that: The air outlet grille (14) comprises a first air outlet grille (141), a second air outlet grille (143), a third air outlet grille (145) and a fourth air outlet grille (147), wherein the first air outlet grille (141), the second air outlet grille (143), the third air outlet grille (145) and the fourth air outlet grille (147) are connected end to end in sequence to form a quadrilateral ring; The heating element (50) comprises four sub-heating elements (52), and the four sub-heating elements (52) are respectively arranged in the airflow cavity (11) corresponding to the first air outlet grille (141), the second air outlet grille (143), the third air outlet grille (145) and the fourth air outlet grille (147).

9. The air heater according to claim 1, characterized in that: The air outlet grille (14) is in the form of a circular ring, and the heating element (50) is constructed as a circular ring sleeved inside the air outlet grille (14).

10. The air heater according to any one of claims 1 to 9, characterized in that: Any one of the plurality of fans (32) can be selectively turned on or off.

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