Warm air device

Abstract

The utility model discloses an air heating device which comprises a device body, an air inlet pipe, an air outlet pipe, an air inlet pipe and an air outlet pipe. The fan assembly is arranged in the air duct and used for driving airflow in the air duct to flow; the heating piece is arranged in the air duct and is used for heating airflow in the air duct; and the air guide blades are arranged between the fan assembly and the heating piece, and the air guide blades are arranged around the axis of the fan assembly. According to the warm air device, the air flow blown out by the fan assembly is guided to the heating piece through the air guide blades, the air volume at the position of the heating piece can be increased, more air flow makes contact with the heating piece so as to take away more heat, the heat dissipation power of the heating piece can be improved, the warm air distance can be prolonged, and the heating range can be enlarged. And the heating effect of the heating device is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of warm air devices, and more specifically, to a warm air device. Background Art

[0002] In the related art, the unreasonable structural design of the heating device leads to a small air volume at the heating element, which easily causes problems such as low heat dissipation power, short warm air distance, slow heating speed, etc., and the user experience is poor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a heating device, wherein the air volume of the heating device at the heating element is large, which is conducive to improving the heat dissipation power, extending the warm air distance, accelerating the heating speed, and improving the user experience.

[0004] According to the embodiment of the utility model, the heating device comprises: a device body, the device body defines an air duct; a fan assembly, the fan assembly is arranged in the air duct and used to drive the airflow in the air duct; a heating element, the heating element is arranged in the air duct and used to heat the airflow in the air duct; a plurality of air guide blades, the air guide blades are arranged between the fan assembly and the heating element, and the plurality of air guide blades are arranged around the axis of the fan assembly. According to the heating device of the embodiment of the utility model, the airflow blown out by the fan assembly is guided to the heating element by the air guide blades, which can increase the air volume at the heating element, so that more airflow contacts the heating element to take away more heat, which is beneficial to improve the heat dissipation power of the heating element, and extend the warm air distance, expand the heating range, speed up the heating speed, enhance the warm air effect of the heating device, and improve the user experience.

[0005] In addition, the heating device according to the above embodiment of the utility model may also have the following additional technical features:

[0006] According to some embodiments of the present invention, the heating element has an air hole extending through the heating element in a set direction, and an angle between at least a portion of the air guide blade and the set direction decreases in a direction approaching the heating element.

[0007] According to some embodiments of the utility model, the angle between the leading edge of the air guide blade close to the fan assembly and the axis of the fan assembly is α, the angle between the normal of the fan blade of the fan assembly close to the trailing edge of the air guide blade and the axis is β, and α is equal to β.

[0008] According to some embodiments of the present invention, in the axial direction of the fan assembly, the distance between the air guide blade and the blades of the fan assembly is L, and 7mm≤L≤15mm.

[0009] According to some embodiments of the present invention, the number of the air guide blades is 11 to 19; and / or at least a portion of the air guide blades extends in an arc in a direction close to the heat generating element.

[0010] According to some embodiments of the utility model, the axis of the fan assembly coincides with the center line of the air duct, the distance between the radial outer end of the blade of the fan assembly and the inner wall surface of the air duct is e, and 4mm≤e≤8mm; and / or, the outer diameter of the fan assembly is d, the axial dimension of the blade of the fan assembly is H, and 2≤d / H≤4.

[0011] According to some embodiments of the utility model, a convex rib is provided on a surface of a blade of the fan assembly facing the heat-generating element, and the convex rib extends along a circumferential direction of the fan assembly.

[0012] According to some embodiments of the utility model, a plurality of the convex ribs are provided on the same blade, and the plurality of the convex ribs are spaced apart in the radial direction of the blade.

[0013] According to some embodiments of the present invention, the number of the ribs is n, the outer diameter of the fan assembly is d, and 40≤d / n≤60.

[0014] According to some embodiments of the present invention, the height of the rib is h, the outer diameter of the fan assembly is d, and 0.005≤h / d≤0.02.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a partial structural schematic diagram of a warm air device according to an embodiment of the utility model;

[0018] Figure 2 It is a schematic structural diagram of an air duct and air guide blades according to an embodiment of the utility model;

[0019] Figure 3 yes Figure 2 The middle circle shows a partial enlarged view of point A;

[0020] Figure 4 It is a structural schematic diagram of a heating element according to an embodiment of the utility model;

[0021] Figure 5It is a partial structural schematic diagram of a fan assembly and air guide blades according to an embodiment of the utility model;

[0022] Figure 6 is a partial structural cross-sectional view of a warm air device according to an embodiment of the utility model;

[0023] Figure 7 yes Figure 2 Rear view of

[0024] Figure 8 is a partial structural schematic diagram of a fan assembly according to an embodiment of the utility model, wherein the motor is not shown;

[0025] Fig. 9 yes Figure 8 Side view of

[0026] Fig.10 yes Figure 8 A top view of

[0027] Fig.11 is a schematic structural diagram of a fan assembly according to an embodiment of the utility model;

[0028] Fig.12 It is a schematic structural diagram of a fixing member according to an embodiment of the utility model.

[0029] Reference numerals:

[0030] Warm air device 100;

[0031] Device body 10; air duct 11; air duct housing 12; fixing member 13; baffle 131; terminal slot 132;

[0032] Fan assembly 20; blades 21; ribs 211; motor 22;

[0033] The heating element 30 ; the heat sink 31 ; the air hole 311 ; the terminal 32 ; and the air guide blade 40 . DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] 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 a limitation on the present invention.

[0036] In the description of the present invention, "first feature" and "second feature" may include one or more such features, "plurality" means two or more, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them, the first feature "above", "above" and "above" the second feature may include the first feature being directly above and diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature.

[0037] The following describes a heating device 100 according to an embodiment of the present invention with reference to the accompanying drawings.

[0038] Reference Figure 1-Figure 12 As shown, the heating device 100 according to the embodiment of the present invention may include: a device body 10 , a fan assembly 20 , a heating element 30 and a plurality of wind guide blades 40 .

[0039] Specifically, the device body 10 defines an air duct 11 , the fan assembly 20 is disposed in the air duct 11 and is used to drive the air flow in the air duct 11 , and the heating element 30 is disposed in the air duct 11 and is used to heat the air flow in the air duct 11 .

[0040] The device body 10 may include a housing, an air duct housing 12, etc., to define an air duct 11, and air flows in from one end of the air duct 11 and out from the other end. Figure 1 As shown, the device body 10 includes an air duct housing 12 and a fixing member 13 for mounting the heating element 30 , and the air duct 11 includes a space inside the air duct housing 12 and a space inside the fixing member 13 .

[0041] The fan assembly 20 can drive the airflow to rotate and flow, and the heating element 30 can emit heat so that the airflow passes through the heating element 30 and takes away the heat to heat the airflow, so that the airflow in the air duct 11 flows through the heating element 30 driven by the fan assembly 20 and becomes hot air, and then blows away from the heating device 100 to meet the user's heating needs.

[0042] The heating element 30 may be a PTC (positive temperature coefficient) heating element, etc., and the present invention does not limit this. For example, in some embodiments, the heating element 30 is a PTC heating element, which is composed of a PTC ceramic heating element and an aluminum sheet, and a through-air hole 311 is formed between adjacent aluminum sheets. When the PTC ceramic heating element is energized, the PTC ceramic heating element starts to heat up and transfers the heat to the aluminum sheet, thereby increasing the heat at the air hole 311, and the airflow passing through the air hole 311 can be heated.

[0043] In some embodiments, Figure 1-Figure 2 As shown, the front end of the air duct housing 12 has a rectangular opening and the rear end has a circular opening. The circular opening is conducive to adapting to the shape of the rotating airflow driven by the fan assembly 20, and the rectangular opening is conducive to matching the shape of the rectangular fixing member 13, so that the heating member 30 can be installed through the fixing member 13. Of course, the front end of the air duct housing 12 can also be a circular opening or an opening of other shapes, as long as the heating member 30 can be installed.

[0044] The air guide blades 40 are disposed between the fan assembly 20 and the heating element 30. The plurality of air guide blades 40 are arranged around the axis of the fan assembly 20. The air guide blades 40 are configured to reduce the angle between the flow direction of the airflow blown out by the fan assembly 20 and the through direction of the air hole 311. Figure 1 As shown, the through direction of the air hole 311 is parallel to the axial direction of the fan assembly 20 .

[0045] The angle between the rotating airflow and the through direction of the air hole 311 is usually large. If the direction of the rotating airflow is not adjusted, the airflow will easily blow more toward the edge of the heating element 30, causing the airflow direction to not match the through direction of the air hole 311, increasing the resistance of the heating element 30 to the airflow and reducing the contact area between the airflow and the heating element 30, so that the airflow can carry away less heat.

[0046] The air guide blades 40 guide the rotating airflow from the fan assembly 20, so that the angle between the airflow and the direction through the air hole 311 is reduced, so that the airflow has a smaller angle with the direction through the air hole 311 after passing through the air guide blades 40 (for example, Figure 3-Figure 4 As shown, γ2<γ1), the airflow passing through the air guide blade 40 flows more along the through-direction of the air hole 311 toward the heating element 30, and then the airflow in the air duct 11 blows more along the through-direction of the air hole 311 toward the heating element 30. It is beneficial to reduce the resistance of the heating element 30 to the airflow, increase the air volume at the end face of the heating element 30, make more airflow pass through the air hole 311 to take away more heat, and greatly improve the heat dissipation power of the heating element 30. At the same time, the wind resistance is reduced, which is beneficial to extend the warm air distance, expand the heating range, speed up the heating speed, enhance the warm air effect of the warm air device 100, and improve the user experience.

[0047] The plurality of air guide blades 40 are arranged around the axis of the fan assembly 20, which is beneficial to improving the guiding effect on the rotating airflow driven by the fan assembly 20 and improving the warm air effect.

[0048] For example, in some specific embodiments, Figure 1-Figure 4 As shown, the air duct 11 extends in the front-to-back direction, the fan assembly 20, the air guide blades 40 and the heating element 30 extend in the front-to-back direction, and a plurality of air guide blades 40 are arranged around the front-to-back direction, so that the wind in the air duct 11 is blown forward along the front-to-back direction away from the heating device 100, thereby reducing the degree of change in wind direction and improving the heating efficiency in the front-to-back direction.

[0049] Furthermore, the heating element 30 includes a plurality of heat sinks 31 extending in the front-to-back direction, and air holes 311 penetrating in the front-to-back direction are formed between adjacent heat sinks 31, and air flows through the air holes 311 to remove heat from the heat sinks 31. The air guide blades 40 can make the rotating air flow blown forward from the fan assembly 20 flow more in the front-to-back direction, and then pass through the air holes 311 in the front-to-back direction, thereby reducing the obstruction of the heat sink 31 to the air flow, increasing the air volume at the heating element 30, allowing the air flow to remove more heat, improving the heat dissipation power of the heating element 30, and extending the warm air distance.

[0050] In some embodiments, Figure 2 and Figure 5-Figure 7 As shown, the radial outer end of the air guide blade 40 is connected to the inner wall surface of the air duct shell 12, and the shape of the radial outer end of the air guide blade 40 changes with the shape of the inner wall surface of the air duct shell 12 to achieve the connection between the air guide blade 40 and the air duct shell 12. The shape change of the inner wall surface of the air duct shell 12 can adapt to the shape change of the front end opening and the rear end opening of the air duct shell 12.

[0051] According to the heating device 100 of the embodiment of the utility model, the air flow blown out by the fan assembly 20 is guided toward the heating element 30 by the air guide blades 40, which can increase the air volume at the heating element 30, so that more air flow contacts the heating element 30 to take away more heat, which is beneficial to improve the heat dissipation power of the heating element 30, extend the warm air distance, expand the heating range, speed up the heating speed, enhance the warm air effect of the heating device 100, and improve the user experience.

[0052] The air guide blades 40 are configured to reduce the angle between the flow direction of the airflow blown out by the fan assembly 20 and the through-flow direction of the air holes 311. The configuration of the air guide blades 40 can be achieved in a variety of ways. For example, in some embodiments, Figure 1-Figure 4 As shown, the heating element 30 has an air hole 311 penetrating along a set direction, and the angle between at least a portion of the air guide blade 40 and the set direction decreases along the direction approaching the heating element 30 .

[0053] The rotating airflow from the fan assembly 20 to the air guide blade 40 can be guided by the air guide blade 40 along a direction with a smaller angle (for example, Figure 3-Figure 4 As shown, γ2<γ1), that is, the angle between the flow direction of the airflow blown out by the fan assembly 20 and the through-direction of the air hole 311 can be reduced, so that the airflow is rectified to flow in a direction close to or even the same as the through-direction of the air hole 311, and the changes to the heating device 100 are relatively small, and it is easy to implement.

[0054] The set direction may be the axial direction of the fan assembly 20 or a direction that is at a certain angle to the axial direction. For example, in some embodiments, the set direction is the front-to-back direction. Figure 4 Front-to-back orientation shown.

[0055] In some embodiments of the present invention, Figure 1-Figure 5 As shown, the angle between the leading edge of the air guide blade 40 close to the fan assembly 20 and the axis of the fan assembly 20 is α, and the angle between the normal of the blade 21 of the fan assembly 20 close to the trailing edge of the air guide blade 40 and the axis is β, and α is equal to β.

[0056] The airflow flows from the leading edge to the trailing edge. For example, in some embodiments, such as Figure 1 As shown, the airflow blows from the leading edge to the trailing edge of the fan assembly 20 from back to front, and the airflow blows from the leading edge to the trailing edge of the air guide blade 40 .

[0057] α is equal to β, so that the airflow driven by the fan assembly 20 can be blown more toward the windward surface of the wind guide blade 40 (for example Figure 3 As shown by the arrow, it is beneficial to realize the smooth transition of the airflow from the fan assembly 20 to the air guide blades 40, which has a better rectifying effect on the airflow, can reduce the wind energy loss, reduce the air volume loss, make more airflow blow to the heating element 30 for heating, and improve the heating efficiency.

[0058] In some embodiments of the present invention, Figure 6 As shown, in the axial direction of the fan assembly 20, the distance between the air guide blade 40 and the blade 21 of the fan assembly 20 is L, and 7mm≤L≤15mm.

[0059] If the spacing L is too large, the design matching degree between the air guide blade 40 and the blade 21 is low, which will cause the airflow velocity of the fan assembly 20 blowing to the air guide blade 40 to be too low, resulting in excessive wind energy loss, making the air volume blowing to the heating element 30 through the air guide blade 40 small, which is easy to shorten the warm air distance, reduce the heat radiation range, and reduce the heat dissipation power of the heating element 30. If the spacing L is too small, the design matching degree between the air guide blade 40 and the blade 21 is low, the air guide blade 40 and the blade 21 are more compactly distributed, the airflow space is small and is greatly obstructed by the air guide blade 40, which is easy to increase wind energy loss, reduce the heat dissipation power of the heating element 30, and cause the airflow velocity of the fan assembly 20 blowing to the air guide blade 40 to be too high, which is easy to produce abnormal sound and high noise.

[0060] The spacing L is within the above-mentioned size range, which is conducive to taking into account the multiple requirements of warm air distance, heat dissipation power and low noise. For example, L is 7mm, 10mm, 15mm, etc.

[0061] In some embodiments of the present invention, Figure 7 As shown, the number of the air guide blades 40 is 11 to 19.

[0062] If there are too many air guide blades 40, the air guide blades 40 are densely distributed around the axis of the fan assembly 20, which can easily produce a strong shielding effect on the airflow driven by the fan assembly 20, thereby reducing the amount of air blowing to the heating element 30 through the air guide blades 40, and reducing the heating efficiency. If there are too few air guide blades 40, the air guide blades 40 are sparsely distributed around the axis of the fan assembly 20, which can easily reduce the guiding effect of the air guide blades 40 on the airflow, causing the airflow to be too obstructed by the heating element 30, and reducing the warm air distance. Within the above-mentioned number range, it is beneficial to take into account the dual requirements of heating efficiency and warm air distance. For example, the number of air guide blades 40 is 11, 15, 19, etc.

[0063] At least part of the air guide blade 40 may extend in a folded line, an arc line, etc. in a direction close to the heating element 30, so as to guide the airflow. Figure 1 and Figure 3 As shown, at least a portion of the air guide blade 40 extends in an arc in a direction close to the heating element 30, so that the air guide blade 40 guides the airflow more smoothly, which is beneficial to reduce the obstruction of the air guide blade 40 to the airflow, reduce wind energy loss, increase wind speed, and speed up heating.

[0064] In some embodiments of the present invention, Figure 2As shown, the width of the air guide blade 40 is equal everywhere from the radial inner end to the radial outer end of the air guide blade 40. The multiple air guide blades 40 guide the airflow at various locations more evenly in the radial direction, thereby making the air volume blowing toward the heating element 30 more evenly distributed, so that the heated airflow is blown out evenly in the radial direction, which is beneficial to improving the heating stability of the heating device 100.

[0065] In some embodiments of the present invention, Figure 6 As shown, the axis of the fan assembly 20 coincides with the center line of the air duct 11, and the distance between the radial outer end of the blade 21 of the fan assembly 20 and the inner wall surface of the air duct 11 is e, and 4mm≤e≤8mm. The axis of the fan assembly 20 coincides with the center line of the air duct 11, which is conducive to the airflow driven by the fan assembly 20 rotating around the center line of the air duct 11, thereby making the airflow distribution in the air duct 11 more uniform, reducing the wind resistance of the wall of the air duct 11 to the rotating airflow, and making the airflow flow more smoothly through the air guide blade 40 and then blow to the heating element 30 to take away more heat, thereby improving the heating efficiency.

[0066] For example, in some embodiments, Figure 6 As shown, the inner diameter of the air duct 11 is D, and the outer diameter of the fan assembly 20 is d. The specific values ​​of D and d can be determined according to the specific size requirements of the heating device 100, d = D-2e, so that the axis of the fan assembly 20 coincides with the center line of the air duct 11.

[0067] The spacing e is in the range of 4 mm to 8 mm. If the spacing e is too large, the design matching degree between the blade 21 and the inner wall of the air duct 11 is low, and the airflow from the fan assembly 20 to the air guide blade 40 is likely to flow through the gap between the blade 21 and the inner wall of the air duct 11 in a direction away from the heating element 30, so that the air volume guided by the air guide blade 40 and blown to the heating element 30 is small, the overall guiding effect of the airflow is poor, the overall wind resistance blowing to the heating element 30 is increased, and the warm air distance is likely to be shortened, the heat radiation range is reduced, and the heating efficiency of the heating element 30 is reduced. For example, in some embodiments, Figure 6 As shown, if the spacing e is too large, the air flow will easily flow backward from the spacing, so that the air volume blowing forward through the air guide blades 40 to the heating element 30 is small, and the heating efficiency is low.

[0068] If the spacing e is too small, the blade 21 and the inner wall of the air duct 11 will have a low design match, which will lead to a large wind pressure between the fan assembly 20 and the air guide blade 40, which will easily produce abnormal sounds and high noise. If the spacing e is within the above size range, it is beneficial to take into account the multiple requirements of warm air distance, heating efficiency and low noise. For example, e is 4mm, 6mm, 8mm, etc.

[0069] In some embodiments of the present invention, Figure 8-Figure 9As shown, the outer diameter of the fan assembly 20 is d, the axial dimension of the blade 21 of the fan assembly 20 is H, and 2≤d / H≤4. If the ratio d / H is too large, the shape of the blade 21 along the axial direction will be too flat, which will greatly weaken the driving ability of the fan assembly 20 on the airflow, making the air volume driven by the fan assembly 20 too small, and the warm air distance and heating efficiency will be low.

[0070] If the ratio d / H is too small, the blade 21 will be too large in the axial direction, so that the airflow driven by the rotation of the blade 21 will flow more radially rather than axially, thereby reducing the air volume and wind speed blowing to the heating element 30, and the warm air distance and heating efficiency are low. In addition, the driving force required for the rotation of the blade 21 is greater, and the energy consumption is higher. d / H is within the above size range, which is conducive to taking into account the multiple requirements of warm air distance, heating efficiency and low energy consumption. For example, d / H is 2, 3, 4, etc.

[0071] In some embodiments of the present invention, Figure 6 and Figure 8-Figure 11 As shown, a convex rib 211 is provided on one side of the blade 21 of the fan assembly 20 facing the heating element 30, and the convex rib 211 extends along the circumferential direction of the fan assembly 20. The flow direction of the rotating airflow generated by the rotation of the blade 21 has a flow component in the axial direction toward the heating element 30 and a flow component in the radial direction outward. The flow in the axial direction is conducive to blowing toward the heating element 30 to take away heat, and the flow in the radial direction outward will reduce the contact area between the airflow and the heating element 30, resulting in a large loss of wind energy.

[0072] The convex rib 211 can constrain and guide the flow tendency of the rotating airflow to flow radially outward, so that the rotating airflow is hindered by the convex rib 211 and changes direction, thereby increasing the tendency of the airflow to flow axially toward the heating element 30, which is beneficial to reducing wind resistance, increasing the air volume blown axially toward the end face of the heating element 30, extending the warm air distance and increasing the heat dissipation power of the heating element 30, thereby enhancing the warm air effect.

[0073] The ribs 211 are subjected to wind pressure when guiding the airflow, which increases the load on the blades 21, thereby reducing the rotation speed of the blades 21 to a certain extent, thereby playing a role in reducing noise. That is, for the two types of blades 21 with and without the ribs 211, under the condition of the same heating efficiency, the blades 21 with the ribs 211 have lower noise. Therefore, the provision of the ribs 211 is conducive to meeting the multiple requirements of warm air distance, heating efficiency and low noise.

[0074] The ribs 211 extend along the circumferential direction of the fan assembly 20 , and can guide the airflow at different positions along the circumferential direction, thereby further increasing the air volume flowing along the axial direction.

[0075] The arc length of the rib 211 along the circumferential direction is related to the arc length of the edges of the blade 21 along the axial direction. The end faces of the rib 211 at both ends in the length direction are coplanar with the leading edge and the trailing edge of the blade 21, respectively, to obtain a longer arc length, so that the rib 211 can guide more airflows at different positions along the circumferential direction; the end faces of the rib 211 at both ends in the length direction can also have a certain gap with the leading edge and the trailing edge of the blade 21, respectively, so that the rib 211 can guide the airflow.

[0076] The convex rib 211 may be arranged perpendicular to the surface of the blade 21, or the convex rib 211 may be arranged inclined at a certain angle to the surface of the blade 21, as long as the convex rib 211 can guide the airflow.

[0077] In some embodiments, Figure 8 As shown, a plurality of ribs 211 are provided on the same blade 21, and the plurality of ribs 211 are arranged at intervals in the radial direction of the blade 21. The plurality of ribs 211 arranged at intervals in the radial direction can guide the airflow at different radial positions, thereby improving the guiding effect, increasing the contact area between the airflow and the heating element 30, allowing the airflow to carry away more heat, and improving the heating efficiency.

[0078] In some embodiments, Figure 8 As shown, the number of ribs 211 is n, the outer diameter of the fan assembly 20 is d, and 40≤d / n≤60. If the ratio d / n is too large, the ribs 211 on the blades 21 will be sparsely distributed, which will greatly reduce the guiding effect of the blades 21 on the airflow, resulting in poor heating efficiency. In addition, the wind pressure on the ribs 211 is too small, the load on the blades 21 is too small, the rotation speed of the blades 21 is too high, and the noise is relatively large.

[0079] If the ratio d / n is too small, the ribs 211 on the blade 21 will be densely distributed, causing the ribs 211 to be subjected to excessive wind pressure, and the blade 21 to be overloaded, which will cause the blade 21 to rotate too slowly, and the driving ability of the airflow will be weak, which will easily reduce the air volume and reduce the heating efficiency. Within the above-mentioned size range, d / n is conducive to taking into account the dual requirements of heating efficiency and low noise. For example, d / n is 40, 50, 60, etc.

[0080] In some embodiments with ribs 211, such as Figure 8 and Fig.10 As shown, the height of the rib 211 is h, the outer diameter of the fan assembly 20 is d, and 0.005≤h / d≤0.02. If the ratio h / d is too large, the rib 211 on the blade 21 will be too high, which will easily cause the rib 211 to be subjected to excessive wind pressure, thereby causing the blade 21 to rotate too slowly, which will easily reduce the air volume and poor heating efficiency.

[0081] If the ratio h / d is too small, the height of the rib 211 on the blade 21 will be too small, which will greatly reduce the guiding effect of the rib 211 on the airflow, resulting in poor heating efficiency. In addition, the load on the blade 21 will be too small, resulting in too high a rotation speed of the blade 21 and high noise. When h / d is within the above-mentioned size range, it is conducive to taking into account the dual requirements of heating efficiency and low noise. For example, h / d is 0.005, 0.01, 0.02, etc.

[0082] A heating device 100 according to a specific embodiment of the utility model is described in detail below with reference to the accompanying drawings. It is worth noting that the following description is only an exemplary illustration and cannot be construed as a limitation to the utility model.

[0083] like Figure 1-Figure 12 As shown, a heating device 100 according to a specific embodiment of the utility model includes a device body 10, a fan assembly 20, a heating element 30 and 12 air guide blades 40, and the fan assembly 20, the air guide blades 40 and the heating element 30 are arranged in sequence from back to front.

[0084] The device body 10 includes a housing, an air duct housing 12, a fixing member 13, etc. The device body 10 defines an air duct 11 extending in the front-to-back direction. The fan assembly 20 is disposed in the air duct housing 12, the air guide blade 40 is disposed in the air duct housing 12 and located at the front side of the fan assembly 20, the fixing member 13 is disposed at the front side of the air duct housing 12, and the heating element 30 is fixed in the fixing member 13.

[0085] The fan assembly 20 includes a motor 22 and a plurality of blades 21 . The blades 21 are axial flow blades. The front side of each blade 21 is provided with four radially spaced ribs 211 . The ribs 211 extend along the circumferential direction of the fan assembly 20 .

[0086] The fixing member 13 is a rectangular member, such as Fig.12 As shown, the upper end of the fixing member 13 is provided with a plurality of terminal slots 132 and the lower end is provided with two rows of baffles 131 spaced apart from each other. The upper end of the heating element 30 is provided with a plurality of terminals 32 that can be respectively inserted into the plurality of terminal slots 132. The lower end of the heating element 30 is inserted between the two rows of baffles 131 to limit the heating element 30 in the front and rear directions, and the terminal 32 is inserted into the terminal slot 132 from front to back to install the heating element 30 on the fixing member 13. The installation of the heating element 30 is relatively simple. The heating element 30 is a PTC heating element, and the heating element 30 includes a plurality of heat sinks 31, and air holes 311 that penetrate from front to back are formed between adjacent heat sinks 31.

[0087] The rear end of the air duct housing 12 has a circular opening to adapt to the shape of the blades 21 and the rotating airflow, and the front end of the fan assembly 20 has a rectangular opening to adapt to the shape of the rectangular fixing member 13 .

[0088] The 12 air guide blades 40 are arranged around an axis extending in the front-to-back direction, and the radial outer ends of the air guide blades 40 are connected to the inner wall of the air duct shell 12. The angle between the air guide blades 40 and the front-to-back direction decreases forward to guide the airflow flowing through the air guide blades 40 from back to front, so that the airflow is guided to a smaller angle with the front-to-back direction, or even parallel to the front-to-back direction, thereby increasing the air volume flowing to the heating element 30 along the front-to-back direction and improving the heating efficiency.

[0089] The relationship d=D-2e is satisfied between the fan assembly 20 and the air duct shell 12, so that the axis of the fan assembly 20 coincides with the center line of the air duct 11, which is beneficial to improving the uniformity of airflow distribution in the air duct 11, thereby increasing the overall contact area between the airflow blowing toward the heating element 30 and the heating element 30, thereby improving the heating efficiency.

[0090] There are 12 air guide blades 40, which is conducive to taking into account the dual requirements of heating efficiency and warm air distance. 7mm≤L≤15mm, and 4mm≤e≤8mm, which can improve the design matching degree between the blade 21 and the air guide blade 40, the design matching degree between the blade 21 and the inner wall of the air duct 11, and then improve the design matching degree between the blade 21 and the air duct shell 12, which is conducive to taking into account the multiple requirements of warm air distance, heat dissipation power and low noise. 2≤d / H≤4, 40≤d / n≤60, 0.005≤h / d≤0.02, which is conducive to meeting the multiple requirements of heating efficiency, warm air distance, low noise and low energy consumption.

[0091] When the heating device 100 starts working, the motor 22 drives the blade 21 to rotate, and the blade 21 rotates to form a rotating airflow, and the ribs 211 on the blade 21 constrain and guide the flow trend of the rotating airflow flowing radially outward, so that the rotating airflow is hindered by the ribs 211 and changes direction, so as to increase the tendency of the airflow to flow toward the heating element 30 in the front-to-back direction. At the same time, the ribs 211 are acted upon by wind pressure to reduce the rotation speed of the blade 21 to a certain extent, which is conducive to reducing noise. When the rotating airflow flows forward through the air guide blades 40, the multiple air guide blades 40 guide the airflow, so that the airflow flows in a direction with a smaller angle with the front-to-back direction, and then the airflow flows more in the front-to-back direction toward the heating element 30, so that more airflow passes through the air holes 311 of the heating element 30 to take away more heat, increase the heat dissipation power of the heating element 30, extend the warm air distance, increase the heat radiation range, improve the warm air effect, and improve the user experience.

[0092] On the premise that the heat dissipation power meets the requirements, the noise of the heating device 100 can be reduced from 64dB to 46dB, and the warm air distance is also extended.

[0093] Other structures and operations of the heating device 100 according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0094] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0095] In the description of this specification, the description with reference to the terms "embodiment", "specific embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0096] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heating device, characterized in that: include: a device body, the device body defining an air outlet duct; A fan assembly, the fan assembly being disposed in the air duct and used to drive the air flow in the air duct; A heating element, the heating element is arranged in the air outlet duct and is used to heat the airflow in the air duct; A plurality of wind guide blades are provided between the fan assembly and the heat generating element, and the plurality of wind guide blades are arranged around the axis of the fan assembly.

2. The heating device according to claim 1, characterized in that: The heating element has an air hole penetrating along a set direction, and the angle between at least a portion of the air guide blade and the set direction decreases along a direction approaching the heating element.

3. The heating device according to claim 1, characterized in that: The angle between the leading edge of the wind guide blade close to the fan assembly and the axis of the fan assembly is α, the angle between the normal of the blade of the fan assembly close to the trailing edge of the wind guide blade and the axis is β, and α is equal to β.

4. The heating device according to claim 1, characterized in that: In the axial direction of the fan assembly, the distance between the air guide blade and the blade of the fan assembly is L, and 7mm≤L≤15mm.

5. The heating device according to claim 1, characterized in that: The number of the air guide blades is 11 to 19; and / or, At least a portion of the air guide blade extends in an arc shape in a direction close to the heating element.

6. The heating device according to claim 1, characterized in that: The axis of the fan assembly coincides with the center line of the air duct, the distance between the radial outer end of the blade of the fan assembly and the inner wall surface of the air duct is e, and 4mm≤e≤8mm; and / or, The outer diameter of the fan assembly is d, the axial dimension of the blades of the fan assembly is H, and 2≤d / H≤4.

7. The warm air device according to any one of claims 1 to 6, characterized in that: A convex rib is provided on a surface of one side of the blade of the fan assembly facing the heat generating element, and the convex rib extends along the circumferential direction of the fan assembly.

8. The heating device according to claim 7, characterized in that: A plurality of the convex ribs are arranged on the same blade, and the plurality of the convex ribs are spaced apart in the radial direction of the blade.

9. The heating device according to claim 8, characterized in that: The number of the ribs is n, the outer diameter of the fan assembly is d, and 40≤d / n≤60.

10. The heating device according to claim 7, characterized in that: The height of the rib is h, the outer diameter of the fan assembly is d, and 0.005≤h / d≤0.02.

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