Warm air blower

Abstract

The invention relates to a warm air blower, and relates to the technical field of air supply. The warm air blower comprises a shell, a fan assembly, a heating assembly and a power line, the shell is provided with an air inlet end, an air duct and an air outlet end, and the air inlet end and the air outlet end are located at the two opposite ends of the air duct correspondingly; the fan assembly is installed on the side, close to the air inlet end, of the air duct. The heating assembly is installed on the side, close to the air outlet end, of the air duct. The power line is electrically connected with the fan assembly and the heating assembly; the air inlet end of the shell is provided with an air inlet face and an air inlet part protruding relative to the air inlet face, the air inlet part and the air channel are coaxially arranged, a containing groove is defined by the air inlet part and the edge side of the shell, and the power line can be arranged on the peripheral side of the air inlet part in a winding mode and contained in the containing groove. The power line can be wound around the periphery of the protruding air inlet part and stored in the containing groove, the overall structure is simple, and operation is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of air supply, and in particular to a heater. Background Art

[0002] In the related art, some desktop fan heaters do not have a design for storing the power cord, and the storage of the power cord is a core demand of users. Since the desktop fan heater is small and compact, it is difficult to set up a storage space for the power cord. Summary of the invention

[0003] Based on this, it is necessary to provide a heater to address the problem of the heater having no design for storing the power cord.

[0004] To achieve the above objectives, the technical solutions adopted in this application are as follows:

[0005] The embodiment of the present application provides a heater, comprising:

[0006] A housing, which is provided with an air inlet, an air duct and an air outlet, wherein the air inlet and the air outlet are respectively located at two opposite ends of the air duct;

[0007] A fan assembly, which is installed on one side of the air duct close to the air inlet end;

[0008] A heating component installed on one side of the air duct close to the air outlet end; and

[0009] a power line electrically connected to the fan assembly and the heating assembly;

[0010] Among them, the air inlet end of the shell is provided with an air inlet surface and an air inlet portion protruding relative to the air inlet surface, the air inlet portion is coaxially arranged with the air duct, and is defined with the side of the shell to form a receiving groove, and the power cord can be wound around the periphery of the air inlet portion and be received in the receiving groove.

[0011] Through the above design, when the heater is not in operation, the power cord can be wound around the peripheral wall of the air inlet portion and stored in the receiving groove without being exposed outside the heater, thereby improving the aesthetics of the stored state.

[0012] In one of the embodiments, the air inlet portion includes a first air inlet area located on the end surface, and an inner diameter of the first air inlet area is not less than an inner diameter of the air duct.

[0013] Through the above design, the air intake volume of the heater is guaranteed and the heating rate is improved.

[0014] In one of the embodiments, the air inlet portion further includes a second air inlet area located on the peripheral side, and the second air inlet area and the first air inlet area both have a grille structure.

[0015] Through the above design, the air intake volume of the heater is further increased, and the warm air supply efficiency is improved.

[0016] In one embodiment, the fan assembly includes a fan blade, the radius of the fan blade is D1, the inner diameter of the first air inlet area and the inner diameter of the air duct are both 2*D2, and satisfy: D1<D2<D1+3mm;

[0017] The outer diameter of the first air inlet area is 2*D3, and satisfies: D3>D2>D1.

[0018] Through the above design, while ensuring the positive air inlet area of ​​the first air inlet area, the circumferential air inlet area of ​​the second air inlet area is increased, further improving the air intake volume of the heater.

[0019] In one embodiment, the thickness of the fan along the axial direction is b, the air duct includes a first extension section, the first extension section is located on a side of the air duct close to the air inlet end, and the thickness of the first extension section along the axial direction is c, and satisfies: c>b.

[0020] Through the above design, it is ensured that the cold air is gathered under the suction of the fan blades and flows to the heating component, thereby improving the heating rate.

[0021] In one embodiment, the air duct further includes a contraction section, one side of the contraction section is connected to the first extension section, and the other side of the contraction section is gathered along the axial direction.

[0022] Through the above design, the airflow gathered upstream is smoothly gathered to the heating component, thereby ensuring the heat exchange efficiency of the airflow.

[0023] In one embodiment, the air duct further includes a second extension section on which the heating component is installed, the second extension section is connected to a side of the contraction section away from the first extension section, the spacing between the heating component and the contraction section is δ, and satisfies: 0<δ<1mm.

[0024] Through the above design, the problem of increased air flow resistance causing reduced power of the heating component when the heating component and the second extension section are completely closed can be avoided; at the same time, the problem of air flow leaking from the gap between the heating component and the contraction section when the spacing is too large, causing part of the cold air to be discharged through the air outlet, affecting the user's heating experience, can be improved.

[0025] In one of the embodiments, a raised height of the air inlet portion relative to the air inlet surface is h, and satisfies: 10 mm < h < 20 mm.

[0026] Through the above design, the winding of the power cord is satisfied, the circumferential air inlet area is guaranteed, and the problem of the air inlet portion protruding too much from the air inlet surface to affect the appearance is avoided.

[0027] In one embodiment, the first air inlet area and the second air inlet area are both provided with a plurality of grille holes, the minimum spacing between two opposite sides of the grille holes is a, and satisfies: 5mm<a<6.5mm.

[0028] Through the above design, the maximum air intake of the grille is guaranteed, and the safety regulations and experimental impact requirements of the air intake part can be met.

[0029] In one embodiment, the heater further comprises a cover plate and an air outlet grille, wherein the cover plate is mounted on the air outlet end of the shell, and the air outlet grille is arranged on a side of the cover plate facing away from the shell;

[0030] A wind guide surface expanding away from the axial direction is provided on a side of the cover plate facing away from the shell, and an angle α between the wind guide surface and the axial direction is satisfied: 45°<α<90°.

[0031] Through the above design, the concentration of airflow is appropriately reduced, and the hot airflow flowing out of the heating component will be appropriately dispersed to both sides, reducing the central temperature of the air outlet grille and ensuring safety.

[0032] In one of the embodiments, the heater further includes a filter assembly, and the filter assembly is detachably mounted on the air inlet end of the housing.

[0033] Through the above design, the filter assembly can further protect and cover the power cord stored in the receiving slot, improve the overall aesthetics, and play a role in dust prevention and hair filtering.

[0034] Compared with the related art, the beneficial effect of the present application is as follows: the present application provides a heater, which includes a housing, a fan assembly, a heating assembly and a power cord. The air inlet end of the housing is provided with a receiving groove, and a relatively raised air inlet portion is formed. In this way, when the heater is not in operation, the power cord can be wound around the raised air inlet portion and stored in the receiving groove, and the overall structure is streamlined and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 This is a schematic diagram of the explosion structure of the heater in some embodiments of the present application;

[0037] Figure 2 This is a schematic cross-sectional structure diagram of a heater in some embodiments of the present application;

[0038] Figure 3 This is a schematic diagram of the structure of the air inlet end in some embodiments of the present application;

[0039] Figure 4 This is a schematic diagram of the assembly structure of the filter assembly in some embodiments of the present application;

[0040] Figure 5 This is a schematic diagram of the structure of the air duct in some embodiments of the present application;

[0041] Figure 6 It is a structural schematic diagram of a heater in the related art;

[0042] Figure 7 Schematic diagram of gas flow of the bevel cover plate in some embodiments of the present application;

[0043] Figure 8 Schematic diagram of gas flow of a planar cover plate in some embodiments of the present application.

[0044] Description of reference numerals:

[0045] 1. Shell; 2. Air cavity; 3. Fan; 4. Heating element; 5. Air inlet; 6. Air outlet;

[0046] 100, heater; 110, housing; 111, air duct; 112, air inlet; 113, air outlet; 114, air inlet; 115, receiving slot; 116, air inlet surface; 120, fan assembly; 121, fan blade; 122, bracket; 130, heating assembly; 140, cover plate; 141, air guide surface; 150, air outlet grille; 160, filter assembly. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application 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 application. However, the present application 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 application, so the present application is not limited by the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0049] In addition, if the term "and / or" appears, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. If the terms "first" and "second" appear, these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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 this application can be understood according to the specific circumstances.

[0051] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the 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. The first feature being "below", "below" and "below" the 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.

[0052] It should be noted that if 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. If 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. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0053] See also Figure 1 As shown, an embodiment of the present application provides a heater 100, which includes a housing 110, a fan assembly 120, a heating assembly 130 and a power cord (not shown in the figure). The housing 110 is provided with an air duct 111 for air circulation, and the fan assembly 120 and the heating assembly 130 are both installed in the air duct 111 to transport wind and heat airflow. The power cord is electrically connected to the fan assembly 120 and the heating assembly 130, so that when connected to an external power source, the fan assembly 120 and the heating assembly 130 can be controlled to operate.

[0054] Continue reading Figure 2 As shown, specifically, the housing 110 is provided with an air inlet 112, an air duct 111 and an air outlet 113. The cross section of the air duct 111 is circular to accommodate the installation of a circular fan and facilitate the circulation of air. The air inlet 112 and the air outlet 113 are respectively located at the axial ends of the air duct 111, thereby achieving axial output of the air flow and reducing wind loss during the circulation of the air duct 111.

[0055] The fan assembly 120 is installed on one side of the air duct 111 near the air inlet end 112, and includes a fan blade 121 and a motor. The output shaft of the motor is fixedly connected to the axis of the fan blade 121, so that the fan blade 121 is driven by the motor to rotate, absorb cold air from the air inlet end 112, and discharge it toward the air outlet end 113. Preferably, the fan assembly 120 also includes a bracket 122, which can be fastened in the air duct 111 of the housing 110 by bolts, and the motor is fixed on the bracket 122, so that the fan assembly 120 is fixed in the air duct 111.

[0056] The heating assembly 130 is installed on one side of the air duct 111 near the air outlet 113, and includes a heat exchanger for air heating. Optionally, the heat medium of the heat exchanger can be hot water or steam, which can be selected according to actual needs. During the operation of the heater 100, the gas is sucked into the air duct 111 by the fan assembly 120 and flows through the heating assembly 130. Under the action of the heat exchanger, the airflow is heated and discharged through the air outlet 113 to form warm air, meeting the user's heating needs.

[0057] The power cord is electrically connected to the fan assembly 120, the heating assembly 130 and the gas electronic components, so that during operation, the power cord is connected to an external power source to realize the power-on operation of each component of the heater 100. However, when the heater 100 is not in operation, the power cord is scattered outside, which is easy to cause wear and tear, which is not convenient for the user's safety and storage of the heater 100.

[0058] To this end, further, in the embodiment of the present application, an air inlet surface 116 and an air inlet portion 114 protruding relative to the air inlet surface 116 are provided at the air inlet end 112 of the housing 110. Since the air inlet portion 114 is coaxially arranged with the air duct 111, a relatively concave receiving groove 115 is formed between the air inlet portion 114 and the circumferential side of the housing 110. It can be understood that the air inlet surface 116 is the bottom groove surface of the receiving groove 115.

[0059] Thus, when the heater 100 is not in operation, the power cord can be wound around the peripheral wall surface of the air inlet 114 and stored in the receiving groove 115 without being exposed outside the heater 100, and the storage state is more aesthetically pleasing. Therefore, the above design does not increase the overall volume of the heater 100 while meeting the requirements of power cord storage, thereby ensuring the compactness of the heater 100 and improving the user experience.

[0060] Continue reading Figure 3 and Figure 4 As shown, in some embodiments, the heater 100 further includes a filter assembly 160 , and the filter assembly 160 is detachably mounted on the air inlet end 112 of the housing 110 .

[0061] Specifically, the air inlet surface 116 may be provided with a plurality of slots, and a plurality of blocks may be provided on one side where the filter assembly 160 is assembled with the housing 110, so that the filter assembly 160 is installed on the air inlet end 112 of the housing 110 through the cooperation of the blocks and the slots. The area of ​​the filter assembly 160 is close to the area of ​​the air inlet end 112 of the housing 110, so that after the filter assembly 160 is installed on the air inlet end 112, the filter assembly 160 can completely cover the receiving slot 115, further protecting and covering the power cord received in the receiving slot 115, thereby improving the overall aesthetics. In addition, the filter assembly 160 can be formed into a support 122 structure by integrally laminating and injection molding of a thin gauze mesh, which plays a role in dust prevention and hair filtering during the operation of the heater 100, reduces the external part from entering the air duct 111 under the suction of the fan blade 121, and improves the service life.

[0062] Continue reading Figure 5 As shown, in some embodiments, the air inlet portion 114 includes a first air inlet area located at an end surface, and the inner diameter of the first air inlet area is not less than the inner diameter of the air duct 111 .

[0063] Specifically, the first air inlet area is set as a grille structure, so that the cold air enters the air duct 111 through the first air inlet area under the action of the fan assembly 120. At the same time, by setting the inner diameter of the first air inlet area to be not less than the inner diameter of the air duct 111, the air intake volume of the heater 100 is guaranteed and the heating rate is improved.

[0064] See also Figure 6 As shown, in the related art, the heater 3 includes a housing 1 and a fan 3 and a heating element 4 installed in the housing 1. The inner side of the housing 1 is provided with a wind cavity 2, and the two ends are provided with an air inlet 5 and an air outlet 6. The heater 3 takes in air through the air inlet 5 of the same size as the fan 3. The air inlet area is small, the air inlet is insufficient, the air volume of the whole machine is reduced, and the noise of the air inlet of the fan 3 is generated. There are problems such as poor sound quality and low heating power of the whole machine. The heater 3 has a compact structure and a relatively small whole machine. In order to ensure the heat exchange effect of the heating element, in the case of insufficient air volume, the internal contraction of the air cavity 2 is often used to reduce the inner diameter of the air cavity 2 on one side of the heating element to improve the heat exchange effect of the air flow. As a result, the air volume of the air outlet 6 is reduced, the air flow is concentrated, and the temperature of the air outlet 6 is too high. If the air outlet 6 is a metal mesh, the temperature of the metal mesh is high after the hot air flow heats the metal mesh, and there is a risk of scalding; if the air outlet 6 is a plastic grille, the temperature is too high, and the grille is easy to deform, discolor, and burn.

[0065] To improve the above problems, based on the above embodiments, in some embodiments of the present application, the air inlet portion 114 is further improved.

[0066] Specifically, a second air inlet area is arranged on the peripheral side of the air inlet portion 114, and the second air inlet area has a grille structure similar to that of the first air inlet area, so that cold air can enter the air duct 111 from the first air inlet area on the front and the second air inlet area on the peripheral side at the same time, thereby increasing the air intake volume of the heater 100 and improving the warm air supply efficiency.

[0067] Further, the radius of the fan blade 121 is D1, the inner diameter of the first air inlet area and the inner diameter of the air duct 111 are both 2*D2, and satisfy: D1<D2<D1+3mm. The outer diameter of the first air inlet area is 2*D3, and satisfies: D3>D2>D1.

[0068] It is understandable that the housing 110 is an injection molded part or a metal casting, which itself has a certain thickness. Therefore, the grille bars of the air inlet 114 also have a thickness, and D3 includes D1 and the thickness of the grille bars of the air inlet 114. The inner radius D2 of the air duct 111 is set to be larger than the radius D1 of the fan blade 121 to meet the installation requirements of the fan blade 121, so that the fan assembly 120 can be installed in the air duct 111. At the same time, the inner diameter of the first air inlet area is set to 2*D2, which is the same as the inner diameter of the air duct 111, and the area of ​​the positive air inlet surface 116 of the first air inlet area is retained to ensure the air intake of the first air inlet area. The setting of D3 being larger than D2 can ensure the area of ​​the positive air inlet surface 116 of the first air inlet area while increasing the area of ​​the circumferential air inlet surface 116 of the second air inlet area, further increasing the air intake of the heater 100.

[0069] In addition, the inventor of the present application found that when the size of the air duct 111 is too much larger than the size of the fan blade 121, it is easy to cause air leakage around the fan blade 121, resulting in air volume loss and reduced suction power. For this reason, in this embodiment, D1<D2<D1+3mm is defined, that is, the difference between D2 and D1 is within 3mm, while meeting the demand for air volume, reducing air volume loss and improving operating power.

[0070] Exemplarily, the difference between D2 and D1 may be 0.5 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 2.8 mm, etc. The specific selection can be made according to actual needs and is not specifically limited here.

[0071] Furthermore, the thickness of the fan along the axial direction is b, the air duct 111 includes a first extension section, the first extension section is located on one side of the air duct 111 close to the air inlet end 112, and the thickness of the first extension section along the axial direction is c, and satisfies: c>b.

[0072] Specifically, the fan blade 121 is installed on the inner side of the first extension section, and D1 in the above embodiment is the inner radius of the first extension section. By setting the thickness of the first extension section in the axial direction to be greater than the thickness of the fan blade 121, the first extension section completely wraps the fan blade 121, ensuring that the cold air is gathered under the suction of the fan blade 121 and flows to the heating assembly 130, thereby improving the heating rate.

[0073] Furthermore, the air duct 111 further includes a contraction section, one side of which is connected to the first extension section, and the other side of which is gathered along the axial direction.

[0074] Specifically, the contraction section has a certain curved surface, and since the inner diameter of the contraction section close to the heating component 130 is reduced, the airflow gathered upstream can be smoothly gathered to the heating component 130 to ensure the heat exchange efficiency of the airflow. It can be understood that the upstream in this embodiment refers to the side of the contraction section close to the air inlet end.

[0075] Furthermore, the air duct 111 also includes a second extension section installed with a heating component 130, the second extension section is connected to a side of the contraction section away from the first extension section, the spacing between the heating component 130 and the contraction section is δ, and satisfies: 0<δ<1mm.

[0076] Specifically, the heating component 130 is installed on the inner side of the second extension section, and the heating component 130 is covered by the second extension section, and the distance between the wall of the second extension section and the heating component 130 is limited to ensure the ventilation rate and heat exchange effect of the heating component 130. This specific embodiment can avoid the problem that when the heating component 130 and the second extension section are completely closed, the air flow resistance increases, resulting in a decrease in the power of the heating component 130; at the same time, it improves the problem that when the distance is too large, the air flow leaks from the gap between the heating component 130 and the contraction section, causing part of the cold air to be discharged through the air outlet 113, affecting the user's heating experience. Preferably, through the above design, the overall air outlet of the heater 100 is smooth, and the outlet wind speed can reach 1.3m / s.

[0077] Exemplarily, the distance δ between the heating component 130 and the contraction section can be 0.1mm, 0.15mm, 0.2mm, 0.35mm, 0.5mm, 0.55mm, 0.6mm, 0.7mm, 0.85mm, 0.9mm, 0.97mm, etc. The specific selection can be made according to actual needs and is not specifically limited here.

[0078] Furthermore, a raised height of the air inlet portion 114 relative to the air inlet surface 116 is h, and h satisfies: 10 mm<h<20 mm.

[0079] For example, the raised height h of the air inlet portion 114 can be 11 mm, 12 mm, 13 mm, 15 mm, 16 mm, 17 mm, 18.3 mm, 19.2 mm, 19.9 mm, etc., which can be selected according to actual needs and is not specifically limited here. Through the above interval limitation, the winding of the power cord can be fully satisfied, and the circumferential air inlet surface 116 area can be ensured, avoiding the problem of the air inlet portion 114 protruding too much from the air inlet surface 116 to affect the appearance.

[0080] Furthermore, the first air inlet area and the second air inlet area are both provided with a plurality of grille holes, and the minimum spacing between two opposite sides of the grille holes is a, and a satisfies: 5mm<a<6.5mm.

[0081] For example, the minimum spacing a between two opposite sides of the grille hole can be 5.1mm, 5.5mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.45mm, etc., which can be selected according to actual needs and is not specifically limited here. By limiting the above interval, the maximum air intake of the grille can be guaranteed, and the safety regulations and experimental impact requirements of the air inlet part 114 can be met.

[0082] In a set of control implementations, Scheme 1 is a scheme in which only the first air inlet area is provided in the above implementation, and Scheme 2 is a scheme in which both the first air inlet area and the second air inlet area are provided in the above embodiment. Under the same other structural conditions, the operating parameters of Scheme 1 and Scheme 2 are shown in Table 1.

[0083]

[0084] Table 1

[0085] As can be seen from Table 1, the heating power of Scheme 2 is higher, and the sound energy radiated outward by the sound source per unit time is lower. In addition, the sound quality of Scheme 1 is poor, which is difficult for users to accept, while the sound quality of Scheme 2 is better, which improves the user's comfort. Scheme 2 increases the air intake volume and heating power by simultaneously taking in air in the axial and circumferential directions. At the same time, since the air intake is compensated when entering the fan assembly 120, the overall air intake is smoother, the sound quality is better, and the user experience is more comfortable.

[0086] Continue reading Figure 7 and Figure 8 As shown, in some embodiments, the heater 100 further includes a cover plate 140 and an air outlet grille 150, wherein the cover plate 140 is mounted on the air outlet end 113 of the housing 110, and the air outlet grille 150 is disposed on the side of the cover plate 140 facing away from the housing 110. In this way, the air outlet side of the heating component 130 is restricted by the cover plate 140, so that the heating component 130 is fixed in the air duct 111, and the generated warm air is discharged to the user through the air outlet grille 150, thereby meeting the warm air supply demand of the heater 100.

[0087] Preferably, the air outlet grille 150 is made of plastic, which is conducive to guiding the air and increasing the warm air delivery distance, thereby improving the poor air delivery capacity of the metal grille and avoiding the problem that the center temperature of the metal grille is high and easily causes burns to the user.

[0088] Furthermore, a wind guide surface 141 expanding away from the axial direction is provided on a side of the cover plate 140 facing away from the housing 110 . The included angle between the wind guide surface 141 and the axial direction is α, and satisfies: 45°<α<90°.

[0089] For example, the angle α between the air guide surface 141 and the axial direction can be 47°, 50°, 60°, 70°, 80°, 85°, etc., which can be selected according to actual needs and is not specifically limited here. Through the above interval limitation, the air outlet area of ​​the heater 100 is increased. At the same time, due to the setting of the inclination angle, the concentration of the air flow can be appropriately reduced, and the hot air flow flowing out of the heating component 130 will be appropriately dispersed to both sides, reducing the central temperature of the air outlet grille 150 to ensure safety.

[0090] In another set of control implementations, Scheme 3 uses a cover plate 140 without an inclined air guide surface 141 on the basis of Scheme 2, and Scheme 4 uses a cover plate 140 with an inclined air guide surface 141 on the basis of Scheme 2. Schemes 3 and 4 both use the same air outlet grille 150, and under the condition of the same heating power, the center temperature of the air outlet grille 150 is tested, and the experimental parameters are shown in Table 2.

[0091]

[0092] Table 2

[0093] As can be seen from Table 2, the temperature of the air outlet grille 150 of Solution 4 is lower, which meets the safety requirements and can prevent users from being scalded by the air outlet grille 150 .

[0094] 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.

[0095] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A fan heater, characterized in that: include: A housing, which is provided with an air inlet, an air duct and an air outlet, wherein the air inlet and the air outlet are respectively located at two opposite ends of the air duct; A fan assembly, which is installed on one side of the air duct close to the air inlet end; A heating component installed on one side of the air duct close to the air outlet end; as well as a power line electrically connected to the fan assembly and the heating assembly; Among them, the air inlet end is provided with an air inlet surface and an air inlet portion protruding relative to the air inlet surface, the air inlet portion is coaxially arranged with the air duct, and is defined with the side of the shell to form a receiving groove, and the power cord can be wound around the periphery of the air inlet portion and be received in the receiving groove.

2. The air heater according to claim 1, characterized in that: The air inlet portion includes a first air inlet area located on an end surface, and an inner diameter of the first air inlet area is not less than an inner diameter of the air duct.

3. The air heater according to claim 2, characterized in that: The air inlet portion further includes a second air inlet area located on the peripheral side, and the second air inlet area and the first air inlet area both have a grille structure.

4. The air heater according to claim 3, characterized in that: The fan assembly includes a fan blade, the radius of the fan blade is D1, the inner diameter of the first air inlet area and the inner diameter of the air duct are both 2*D2, and satisfy: D1<D2<D1+3mm; The outer diameter of the first air inlet area is 2*D3, and satisfies: D3>D2>D1.

5. The air heater according to claim 4, characterized in that: The thickness of the fan along the axial direction is b, the air duct includes a first extension section, the first extension section is located on a side of the air duct close to the air inlet end, and the thickness of the first extension section along the axial direction is c, and satisfies: c>b.

6. The air heater according to claim 5, characterized in that: The air duct further includes a contraction section, one side of which is connected to the first extension section, and the other side of which is gathered along the axial direction.

7. The air heater according to claim 6, characterized in that: The air duct also includes a second extension section on which the heating component is installed. The second extension section is connected to a side of the contraction section away from the first extension section. The spacing between the heating component and the contraction section is δ, and satisfies: 0<δ<1mm.

8. The air heater according to claim 3, characterized in that: The protruding height of the air inlet portion relative to the air inlet surface is h, and satisfies: 10 mm<h<20 mm.

9. The air heater according to claim 3, characterized in that: The first air inlet area and the second air inlet area are both provided with a plurality of grille holes, the minimum spacing between two opposite sides of the grille holes is a, and satisfies: 5mm<a<6.5mm.

10. The air heater according to any one of claims 1 to 9, characterized in that: The heater further comprises a cover plate and an air outlet grille, wherein the cover plate is mounted on the air outlet end of the housing, and the air outlet grille is arranged on a side of the cover plate facing away from the housing; A wind guide surface expanding away from the axial direction is provided on a side of the cover plate facing away from the shell, and an angle α between the wind guide surface and the axial direction is satisfied: 45°<α<90°.

11. The air heater according to any one of claims 1 to 9, characterized in that: The heater further comprises a filter assembly, and the filter assembly is detachably mounted on the air inlet end of the housing.

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