Warm air blower

Abstract

The utility model 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] This application relates to the field of air supply technology, and in particular to a warm air blower. Background Technology

[0002] In related technologies, some desktop heaters lack a design for storing the power cord, yet power cord storage is a core user requirement. Due to the compact size and structure of desktop heaters, it's difficult to incorporate space for power cord storage. Utility Model Content

[0003] Therefore, it is necessary to provide a heater that addresses the issue of lacking a retractable power cord design.

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

[0005] This application provides a space heater, including:

[0006] The housing has an air inlet, an air duct, and an air outlet, with the air inlet and air outlet located at opposite ends of the air duct, respectively.

[0007] A fan assembly is installed on the side of the air duct near the air inlet end;

[0008] A heating assembly, which is installed on the side of the air duct near the air outlet; and

[0009] A power cord that is electrically connected to the fan assembly and the heating assembly;

[0010] The housing has an air inlet end with an air inlet surface and an air inlet portion protruding from the air inlet surface. The air inlet portion is coaxially arranged with the air duct and forms a receiving groove with the side of the housing. The power cord can be wound around the periphery of the air inlet portion and stored in the receiving groove.

[0011] With the above design, in the non-operating state of the heater, the power cord can be wrapped around the peripheral wall of the air inlet and stored in the receiving slot, without being exposed on the outside of the heater, thus improving the aesthetics of the stored state.

[0012] In one embodiment, the air inlet includes a first air inlet area located on the end face, the inner diameter of the first air inlet area being not less than the inner diameter of the air duct.

[0013] The above design ensures sufficient air intake for the heater and improves the heating rate.

[0014] In one embodiment, the air inlet further includes a second air inlet area located on the periphery, and both the second air inlet area and the first air inlet area have a grid structure.

[0015] The above design further increases the air intake of the heater and improves the heating supply efficiency.

[0016] In one embodiment, the fan assembly includes a fan blade with a radius of 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 intake area is 2*D3, and satisfies: D3>D2>D1.

[0018] Through the above design, while ensuring the positive air intake area of ​​the first air intake area, the circumferential air intake area of ​​the second air intake area is increased, thereby 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 located on the side of the air duct near the air inlet end, and the thickness of the first extension section along the axial direction is c, satisfying: c > b.

[0020] The above design ensures that cold air is drawn together by the fan blades and flows to the heating components, thereby improving the heating rate.

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

[0022] The above design ensures that the upstream airflow is smoothly concentrated onto the heating component, guaranteeing 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 the side of the contraction section away from the first extension section. The distance between the heating component and the contraction section is δ, and satisfies: 0 < δ < 1 mm.

[0024] The above design avoids the problem of reduced power of the heating component due to increased airflow resistance when the heating component and the second extension section are completely closed; at the same time, it improves the problem of airflow leakage from the gap between the heating component and the contraction section when the gap is too large, causing some cold air to be discharged through the air outlet, which affects the user's heating experience.

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

[0026] The above design satisfies the requirements for winding the power cord, ensures the circumferential air intake area, and avoids the air intake part protruding too much from the air intake surface, which would affect the appearance.

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

[0028] The above design ensures maximum air intake for the grille while also meeting the safety regulations and experimental impact requirements of the air intake section.

[0029] In one embodiment, the heater further includes a cover plate and an air outlet grille, the cover plate being installed at the air outlet end of the housing, and the air outlet grille being disposed on the side of the cover plate facing away from the housing;

[0030] The cover plate has an air guide surface that expands in a direction away from the axial direction on the side facing away from the housing. The angle between the air guide surface and the axial direction is α, and satisfies: 45° < α < 90°.

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

[0032] In one embodiment, the heater further includes a filter assembly that is detachably installed on the air inlet end of the housing.

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

[0034] Compared to related technologies, the advantages of this application are as follows: This application provides a heater, which includes a housing, a fan assembly, a heating assembly, and a power cord. The housing has an air inlet end with a receiving groove, forming a relatively protruding air inlet section. In this way, when the heater is not in operation, the power cord can be wound around the protruding air inlet section and stored in the receiving groove, resulting in a simplified overall structure and ease of operation. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

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

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

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

[0041] Figure 6 This is a schematic diagram of the structure of a warm air blower in related technologies;

[0042] Figure 7 This is a schematic diagram of gas flow in the inclined cover plate in some embodiments of this application;

[0043] Figure 8 This is a schematic diagram of gas flow in a planar cover plate in some embodiments of this application.

[0044] Explanation of reference numerals in the attached figures:

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

[0046] 100. Warm air blower; 110. Housing; 111. Air duct; 112. Air inlet; 113. Air outlet; 114. Air inlet section; 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 Implementation

[0047] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0048] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0049] Furthermore, where the term "and / or" appears, "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. Where the terms "first" and "second" appear, these terms are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0053] See Figure 1 As shown, an embodiment of this application provides a heater 100, which includes a housing 110, a fan assembly 120, a heating assembly 130, and a power cord (not shown). The housing 110 has an air duct 111 for airflow, and both the fan assembly 120 and the heating assembly 130 are installed within the air duct 111 to deliver airflow and heat the air. The power cord is electrically connected to the fan assembly 120 and the heating assembly 130, so that the fan assembly 120 and the heating assembly 130 can operate under controlled conditions when connected to an external power source.

[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 air duct 111 has a circular cross-section to accommodate the installation of a circular fan and facilitate airflow. The air inlet 112 and the air outlet 113 are located at opposite axial ends of the air duct 111, thereby achieving axial airflow output and reducing airflow loss during the airflow process within the air duct 111.

[0055] The fan assembly 120 is installed on the side of the air duct 111 near the air inlet 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, thereby driving the fan blade 121 to rotate, drawing in cool air from the air inlet 112 and discharging it towards the air outlet 113. Preferably, the fan assembly 120 also includes a bracket 122, which can be bolted to the air duct 111 of the housing 110. The motor is fixed to the bracket 122, thereby fixing the fan assembly 120 within the air duct 111.

[0056] The heating element 130 is installed on the side of the air duct 111 near the air outlet 113, and includes a heat exchanger for heating the air. Optionally, the heat medium for the heat exchanger can be hot water or steam, which can be selected according to actual needs. During the operation of the warm air blower 100, air is drawn into the air duct 111 by the fan assembly 120 and flows through the heating element 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, heating assembly 130, and gas electronic components, so that during operation, the power cord can be connected to an external power source to power all components of the heater 100. However, when the heater 100 is not in operation, the power cord is exposed to the outside, which is prone to wear and tear, making it inconvenient for user safety and for storing and organizing the heater 100.

[0058] Therefore, in this embodiment, an air inlet surface 116 and an air inlet portion 114 protruding from 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 recessed 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] In this way, when the heater 100 is not in operation, the power cord can be wrapped around the perimeter wall of the air inlet 114 and stored in the receiving slot 115, without being exposed on the outside of the heater 100, thus improving the aesthetics of the stored state. Therefore, the above design satisfies the need for power cord storage without increasing the overall size of the heater 100, ensuring the structural 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, which is detachably mounted on the air inlet end 112 of the housing 110.

[0061] Specifically, the air inlet surface 116 can be provided with several slots, and several locking blocks are provided on the side where the filter assembly 160 is assembled with the housing 110. The filter assembly 160 is then installed on the air inlet end 112 of the housing 110 through the cooperation of the locking blocks and slots. The area of ​​the filter assembly 160 is approximately the same as 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, it can completely cover the receiving groove 115, further protecting and covering the power cord stored in the receiving groove 115, thus improving the overall aesthetics. Furthermore, the filter assembly 160 can be formed from a thin mesh through a film-coated injection molding process to create a support structure 122. During the operation of the heater 100, this structure serves to prevent dust and filter hair, reducing the amount of external material entering the air duct 111 under the suction of the fan blades 121, thereby extending its service life.

[0062] Continue reading Figure 5 As shown, in some embodiments, the air inlet 114 includes a first air inlet area located on the end face, 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 intake area is configured with a grille structure, allowing cold air to enter the air duct 111 through the first air intake area under the action of the fan assembly 120. At the same time, by setting the inner diameter of the first air intake area to be no less than the inner diameter of the air duct 111, the air intake volume of the heater 100 is ensured, thereby improving the heating rate.

[0064] See Figure 6 As shown, in related technologies, the heater 3 includes a housing 1 and a fan 3 and a heating element 4 installed inside the housing 1. The housing 1 has an air cavity 2 on its inner side, with an air inlet 5 and an air outlet 6 at each end. The heater 3 takes in air through the air inlet 5, which is the same size as the fan 3. However, the small air inlet area results in insufficient airflow, reducing the overall air volume and causing noise interference from the fan 3's airflow, leading to poor sound quality and low overall heating power. Furthermore, the heater 3 has a compact structure and is relatively small. To ensure the heat exchange effect of the heating element, when the air volume is insufficient, the air cavity 2 is often internally contracted, reducing the inner diameter of the air cavity 2 on the side of the heating element to improve the heat exchange effect. This results in reduced airflow at the air outlet 6, concentrated airflow, and excessively high temperature at the air outlet 6. If the air outlet 6 is a metal mesh, the hot airflow will heat the metal mesh to a high temperature, posing a risk of burns. If the air outlet 6 is a plastic grille, the excessively high temperature can easily cause the grille to deform, discolor, and become too hot to touch.

[0065] To improve the above-mentioned problems, based on the above embodiments, some embodiments of this application further improve the air inlet 114.

[0066] Specifically, a second air intake area is provided around the air intake section 114. The second air intake area has a grille structure similar to the first air intake area, so that cold air can enter the air duct 111 from both the first air intake area on the front and the second air intake area on the periphery at the same time, increasing the air intake volume of the heater 100 and thus improving the heating supply efficiency.

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

[0068] Understandably, the housing 110 is an injection-molded or cast metal part, and thus has a certain thickness. Therefore, the grille bars of the air inlet 114 also have thickness, with D3 including D1 and the thickness of the grille bars of the air inlet 114. Setting the inner radius D2 of the air duct 111 to be larger than the radius D1 of the fan blade 121 satisfies the installation requirements of the fan blade 121, allowing the fan assembly 120 to be installed within the air duct 111. Simultaneously, the inner diameter of the first air inlet area is set to 2*D2, the same as the inner diameter of the air duct 111, preserving the positive air inlet surface area 116 of the first air inlet area and ensuring the airflow of the first air inlet area. Setting D3 to be larger than D2 ensures the positive air inlet surface area 116 of the first air inlet area while increasing the peripheral air inlet surface area 116 of the second air inlet area, further increasing the airflow of the heater 100.

[0069] Furthermore, the inventors of this application discovered that when the size of the air duct 111 is significantly larger than the size of the fan blade 121, airflow leakage around the fan blade 121 can easily occur, leading to airflow loss and reduced suction power. Therefore, in this embodiment, D1 < D2 < D1 + 3mm is limited, meaning the difference between D2 and D1 is within 3mm. This satisfies the airflow requirement while reducing airflow loss and improving operating efficiency.

[0070] For example, the difference between D2 and D1 can be 0.5mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 2.8mm, etc., and can be selected according to actual needs. No specific limitation is made 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 the side of the air duct 111 near the air inlet end 112, and the thickness of the first extension section along the axial direction is c, satisfying: 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 encloses the fan blade 121, ensuring that the cold air is drawn together by the fan blade 121 and flows to the heating component 130, thereby improving the heating rate.

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

[0074] Specifically, the contraction section has a certain curved surface shape. Because the inner diameter of the contraction section decreases on the side closer to the heating component 130, it can smoothly gather the airflow from upstream to the heating component 130, ensuring the heat exchange efficiency of the airflow. It can be understood that in this embodiment, upstream refers to the side of the contraction section closer to the air inlet.

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

[0076] Specifically, the heating element 130 is installed inside the second extension section, with the second extension section covering the heating element 130 and defining the distance between the wall of the second extension section and the heating element 130, ensuring the ventilation rate and heat exchange effect of the heating element 130. This specific embodiment avoids the problem of reduced power of the heating element 130 due to increased airflow resistance when the heating element 130 and the second extension section are completely closed; it also mitigates the problem of air leakage from the gap between the heating element 130 and the contraction section when the distance is too large, causing some cold air to be discharged through the air outlet 113, affecting the user's heating experience. Preferably, with the above design, the overall airflow of the heater 100 is smooth, and the outlet air velocity can reach 1.3 m / s.

[0077] For example, the distance δ between the heating component 130 and the shrinkage 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., and can be selected according to actual needs, without being specifically limited here.

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

[0079] For example, the protrusion height h of the air inlet 114 can be 11mm, 12mm, 13mm, 15mm, 16mm, 17mm, 18.3mm, 19.2mm, 19.9mm, etc., and can be selected according to actual needs, without being specifically limited here. By limiting the above range, the winding of the power cord is fully satisfied, and the circumferential air inlet surface 116 area is guaranteed, avoiding the problem of the air inlet 114 protruding too much from the air inlet surface 116, which would affect the appearance.

[0080] Furthermore, both the first and second air intake areas are provided with multiple grille holes, and the minimum distance between the two opposite sides of the grille holes is a, where a satisfies: 5mm < a < 6.5mm.

[0081] For example, the minimum spacing 'a' between the two opposite sides of the grille openings can be 5.1mm, 5.5mm, 5.9mm, 6mm, 6.1mm, 6.2mm, 6.3mm, 6.45mm, etc., and can be selected according to actual needs, without being specifically limited here. By limiting the above range, the maximum air intake of the grille can be guaranteed, while also meeting the safety regulations and experimental impact requirements of the air intake section 114.

[0082] In a set of comparative implementations, Scheme 1 is the scheme described above that only includes a first air intake area, while Scheme 2 is the scheme described above that includes both a first air intake area and a second air intake area. Under the condition that all other structures are the same, the operating parameters for Scheme 1 and Scheme 2 are shown in Table 1.

[0083]

[0084] Table 1

[0085] As shown in Table 1, Scheme 2 has a higher heating power and lower sound energy radiated outward by the sound source per unit time. Furthermore, Scheme 1 has poor sound quality, which is unacceptable to users, while Scheme 2 has superior sound quality, improving user comfort. Scheme 2 increases airflow and heating power through simultaneous axial and circumferential air intake. Simultaneously, because the airflow is compensated upon entering the fan assembly 120, the overall airflow is smoother, resulting in better sound quality and a more comfortable user experience.

[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. The cover plate 140 is installed at 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 cover plate 140 restricts the air outlet side of the heating component 130, fixing the heating component 130 within the air duct 111, and allowing the generated warm air to be discharged to the user through the air outlet grille 150, thus meeting the warm air supply needs of the heater 100.

[0087] Preferably, the air outlet grille 150 is made of plastic, which facilitates airflow and increases the distance the warm air is delivered. This improves upon the poor airflow capacity of metal grilles and avoids the problem of high center temperature in metal grilles, which could easily cause burns to users.

[0088] Furthermore, the cover plate 140 has an air guide surface 141 on the side facing away from the housing 110, which expands in a direction away from the axial direction. The angle between the air 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., and can be selected according to actual needs, without specific limitations here. By limiting the above range, the air outlet area of ​​the heater 100 is increased. At the same time, due to the setting of the tilt angle, the airflow accumulation can be appropriately reduced, and the hot airflow from the heating component 130 will be appropriately dispersed to both sides, reducing the center temperature of the air outlet grille 150 and ensuring safety.

[0090] In another set of comparative implementations, Scheme 3 uses a cover plate 140 without an inclined air guide surface 141, while Scheme 4 uses a cover plate 140 with an inclined air guide surface 141, based on Scheme 2. Both Schemes 3 and Scheme 4 use the same air outlet grille 150. Under the condition of the same heat generation power, the center temperature of the air outlet grille 150 was tested, and the experimental parameters are shown in Table 2.

[0091]

[0092] Table 2

[0093] As shown in Table 2, the air outlet grille 150 of Option 4 has a lower temperature, meets safety requirements, and can better prevent users from being burned by the air outlet grille 150.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A space heater, characterized in that, include: The housing has an air inlet, an air duct, and an air outlet, with the air inlet and air outlet located at opposite ends of the air duct, respectively. A fan assembly is installed on the side of the air duct near the air inlet end; A heating component is installed on the side of the air duct near the air outlet. as well as A power cord that is electrically connected to the fan assembly and the heating assembly; The air inlet end is provided with an air inlet surface and an air inlet portion protruding from the air inlet surface. The air inlet portion is coaxially arranged with the air duct and forms a receiving groove with the side of the housing. The power cord can be wound around the periphery of the air inlet portion and stored in the receiving groove.

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

3. The heater according to claim 2, characterized in that, The air intake section also includes a second air intake area located on the periphery, and both the second air intake area and the first air intake area have a grid structure.

4. The heater according to claim 3, characterized in that, The fan assembly includes a fan blade with a radius of 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 intake area is 2*D3, and satisfies: D3>D2>D1.

5. The warm air blower according to claim 4, characterized in that, The thickness of the fan along the axial direction is b, and the air duct includes a first extension section located on the side of the air duct near the air inlet end. The thickness of the first extension section along the axial direction is c, and the condition c > b is satisfied.

6. The warm air blower according to claim 5, characterized in that, The air duct also includes a contraction section, one side of which is connected to the first extension section, and the other side converges along the axial direction.

7. The warm air blower 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 the side of the contraction section away from the first extension section. The distance between the heating component and the contraction section is δ, and satisfies: 0 < δ < 1 mm.

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

9. The warm air blower according to claim 3, characterized in that, Both the first air intake area and the second air intake area are provided with multiple grille holes. The minimum distance between the two opposite sides of the grille holes is a, and satisfies the condition: 5mm < a < 6.5mm.

10. The heater according to any one of claims 1 to 9, characterized in that, The heater also includes a cover plate and an air outlet grille. The cover plate is installed at the air outlet end of the housing, and the air outlet grille is located on the side of the cover plate facing away from the housing. The cover plate has an air guide surface that expands in a direction away from the axial direction on the side facing away from the housing. The angle between the air guide surface and the axial direction is α, and satisfies: 45° < α < 90°.

11. The heater according to any one of claims 1 to 9, characterized in that, The heater also includes a filter assembly, which is detachably installed at the air inlet end of the housing.

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