Fan for electric heating product

Abstract

The fan comprises a motor, fan blades connected with a rotating shaft of the motor and a fan shell, the motor is connected to the center of the fan shell, an air channel is formed between the motor and the fan shell, and the fan blades are located at an air inlet of the fan shell. Blades of the fan blades are obliquely arranged in the fan blade axis direction far away from the air inlet and the radial direction far away from the axis, each blade comprises a near end face close to the axis, a far end face far away from the axis, a top end face facing the air inlet and two air guide surfaces playing an air guide role, and the air guide surfaces are arc surfaces bent in the length direction. A gap is formed between the far end face and the inner side wall of the fan shell, so that the fan can obtain large air volume and high static pressure capacity, the fan can blow out hot air or assist in dissipating heat for an electric heating product more quickly and uniformly, and the heating or heat dissipation efficiency of the electric heating product is improved. And the structure is simple, so that the electric heating product has the characteristics of high performance and portability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric heating products, and particularly relates to a fan for electric heating products. BACKGROUND

[0002] In the design of electric heating products, fans play a crucial role. They are either used to blow hot air to meet specific heating or drying needs, or used to effectively dissipate the heat accumulated inside to ensure the safe and stable operation of the product. Currently, the main types of fans used in electric heating products are axial fans and centrifugal fans. However, both types of fans have some obvious shortcomings in practical application.

[0003] Axial fans, with their compact structure, easy installation, and ability to produce large air volume, have been widely used in electric heating products. They effectively bring internal heat to the outside environment by pushing air to flow in a direction parallel to the rotating shaft. However, while providing large air volume, axial fans often have low static pressure capacity, which means their performance will significantly decrease when facing greater resistance or needing to transport hot air over long distances. In addition, axial fans can generate significant noise when running at high speed, which not only affects user comfort but also may mask the working sound of the electric heating product itself, making fault diagnosis difficult.

[0004] Centrifugal fans, on the other hand, excel in electric heating products that require pressurized delivery of hot air or heating against greater resistance, due to their ability to produce higher static pressure. They achieve long-distance delivery and precise control of hot air by pushing air to flow in a direction perpendicular to the rotating shaft (i.e., radially). However, the flow rate of centrifugal fans is relatively small, which means they may not meet the high-efficiency heating needs in situations requiring rapid heating or large heating areas. At the same time, the structure of centrifugal fans is relatively complex, increasing manufacturing costs and potentially generating additional noise due to friction and vibration between components. In addition, the larger size of centrifugal fans can be a disadvantage in electric heating products with limited space. SUMMARY

[0005] The utility model aims to solve the problems of insufficient static pressure or small flow rate in existing fans.

[0006] The technical solution of the utility model is as follows:

[0007] The utility model discloses a fan for electric heating product, including motor and fan blade, the pivot of motor is connected with fan blade, it is characterized by: still including fan casing, the motor is connected in the center position of fan casing and forms the air passage between motor and fan casing inner wall, the fan blade is located at the air intake of fan casing, the blade of fan blade is inclinedly arranged along the axial direction of fan blade away from the air intake and the radial direction away from the axis, the blade includes the proximal end face close to the axis, the distal end face away from the axis, the top end face to the air intake and two air guide surface playing the role of air guide, the air guide surface is the arc curved surface along the length direction, and the distal end face and the inner side wall of fan casing form the gap.

[0008] In some embodiments, the fan blade further includes a body, the body is provided with a circular arc inclined surface in the shape of umbrella at the part close to the air intake end, and the blades are arranged on the circular arc inclined surface in intervals.

[0009] Further, the blades include long blades and short blades, and the long blades and the short blades are arranged on the circular arc inclined surface alternately.

[0010] Further, the height of the short blades is lower than that of the long blades.

[0011] In some embodiments, the distal end face of the blade is an inclined surface, and the diameter of the arc line where the distal end face intersects with the top end face is greater than the diameter of the arc line where the distal end face intersects with the circular arc inclined surface.

[0012] In some embodiments, the height of the blade gradually decreases smoothly along the axis of the circular arc inclined surface radially outward.

[0013] In some embodiments, the top end face of the blade is an inclined surface inclined from the air guide surface bent inward to the air guide surface bent outward, and the higher edge of the top end face is close to the inner wall surface of the air intake periphery of the fan casing.

[0014] In some embodiments, the circular arc inclined surface is an arc curved surface with a cross-sectional edge in the middle sinking and being in the shape of arc line, and the inner wall surface of the air intake end periphery corresponds to an arc curved surface parallel to the circular arc inclined surface.

[0015] In some embodiments, the fan housing comprises a fan cover and a motor base, the fan cover is sleeved outside the fan blade and a gap is left between the inner wall of the fan cover and the outer contour of the fan blade, the air inlet is formed on the fan cover, the motor base is fixedly connected with the opposite end of the fan cover away from the air inlet, the motor is installed at the center position of the motor base and a wind channel is formed between the motor and the inner wall of the motor base.

[0016] Further, the motor base is in the shape of a cylinder with both ends open, an installation plate is arranged at the middle position of the open end connected with the fan cover, a gap is formed between the outer contour of the installation plate and the inner wall of the motor base, the outer contour of the installation plate is connected and fixed with the inner wall of the motor base through a narrow-width rib, and the motor is fixedly installed on the installation plate.

[0017] The utility model discloses the beneficial effects are:

[0018] 1, the utility model discloses a fan blade is arranged along the fan axis direction away from the air inlet and the radial direction away from the axis inclination, and the air -guiding surface of blade is designed into the arc bending surface bending along the length direction, and then cooperate fan housing, thereby make this fan fused the advantage characteristic of axial fan and centrifugal fan, make air obtain the large air volume characteristic of axial fan in the flowing process, and can obtain the high static pressure capacity of centrifugal fan to some extent.

[0019] 2, because the fan of the utility model can provide moderate static pressure while keeping higher air volume, thereby effectively overcome the shortcoming that the performance of axial fan declines when facing larger resistance, also make up the deficiency that the flow of centrifugal fan is small, that is, the fan can blow out hot air or auxiliary radiate heat for electric heating product more quickly and more evenly, improve the heating or heat dissipation efficiency of electric heating product.

[0020] 3, the utility model discloses ingenious and simple structure design, effectively improve the performance of the fan of electric heating product, also improve the experience of user, make electric heating product keep high performance while still keep compact, light and portable characteristics, can satisfy more diversified user demand.

[0021] The utility model will be further described below in combination with the drawings. DRAWINGS

[0022] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0023] Figure 2 It is the exploded structure schematic diagram of the utility model;

[0024] Figure 3 It is the section structure schematic diagram of the utility model;

[0025] Figure 4 It is a sectional structure schematic view of the fan blade body and the fan shell of the utility model;

[0026] Figure 5 It is a three-dimensional structure schematic view of the fan blade of the utility model;

[0027] Figure 6 It is a front projection schematic view of the fan blade of the utility model.

[0028] Reference signs:

[0029] Fan blade 1;

[0030] Blade 11, proximal end face 111, distal end face 112, top end face 113, air guide surface 114;

[0031] Body 12, circular arc inclined surface 121, connecting rod 122, shaft hole 123;

[0032] Long blade 1101, short blade 1102;

[0033] Motor 2;

[0034] Shaft 21;

[0035] Fan shell 3;

[0036] Air inlet 30;

[0037] Fan blade sleeve 31, inner wall surface 311, inner side wall 312;

[0038] Motor base 32, mounting plate 321, rib 322, through hole 323, screw hole 324;

[0039] Buckle 4;

[0040] Screw 5. DETAILED DESCRIPTION

[0041] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0042] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features, which are used to distinguish the described features and have no order or importance.

[0043] In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.

[0044] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "fitting", "connection", "connection", "installation" should be understood broadly, for example, it can be fixedly connected, and can also be detachably connected or integrally connected, can be mechanically connected, or can be electrically connected, can be directly connected, or indirectly connected through an intermediate medium, and can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0045] The utility model is described below in combination with the drawings for the fan on the electric heating product.

[0046] As Figure 1 And Figure 6 The utility model relates to a fan for electric heating product, including motor 2 and fan blade 1, the rotating shaft 21 of motor 2 is connected with fan blade 1, to drive fan blade 1 rotation, its characteristics are still including fan casing 3, motor 2 is connected at the center position of fan casing 3 and forms the air duct between motor 2 and fan casing 3 inner wall, fan blade 1 is located at the air inlet 30 of fan casing 3, the blade 11 of fan blade 1 is inclined to set along the axis direction of fan blade 1 away from air inlet 30 and the radial direction away from the axis, as Figure 3As shown in the direction of view, the blade 11 of the fan blade 1 is arranged obliquely from the position of the upper end air inlet 30 to the periphery, the blade 11 comprises a proximal end surface 111 close to the axis, a distal end surface 112 away from the axis, a top end surface 113 towards the end direction of the air inlet 30, and two air guide surfaces 114 for guiding air, the two air guide surfaces 114 are curved arc surfaces along the length direction, that is, the blade 11 of the fan blade 1 is in an arc shape. The working principle of the fan is as follows: when the motor 2 drives the fan blade 1 to rotate, the fan blade 1 generates a negative pressure area in the rotating process, thereby forming a low pressure area in the central area of the air inlet 30, under the action of the low pressure area, the air outside the air inlet 30 is quickly sucked into the arc structure area formed by the adjacent two blades 11, and the high-speed rotation of the blade 11 generates a centrifugal force, and the blade 11 is obliquely designed, so that the sucked air is obliquely discharged to the periphery and downward, as shown in the figure Figure 3 In this process, the air moves along the curved path of the blade 11 to accelerate and increase its kinetic energy. Since there is a gap between the distal end surface 112 and the inner side wall 312 of the fan housing 3, the finally discharged air continues to flow downward under the blockage of the inner side wall 312 of the fan housing 3, thereby realizing that the air flowing downward from the air inlet 30 continues to flow downward after diffusing to the periphery, achieving the purpose of pushing the air to flow in the direction parallel to the rotating shaft 21, ensuring that a relatively large air flow can be provided, and the pressure of the air is improved in the process of centrifugal motion, forming a strong air flow, that is, having a high static pressure capacity. Thus, the shortcomings of the axial flow fan in performance decline when facing large resistance are effectively overcome, and the deficiency of the centrifugal fan in small flow is also compensated, that is, the fan can more quickly and uniformly blow out hot air or assist in dissipating heat for the electric heating product, improving the heating or heat dissipation efficiency of the electric heating product.

[0047] As shown in the figure Figure 5 The fan blade 1 of the utility model further comprises a body 12, the part close to the end of the air inlet 30 of the body 12 is provided with a circular arc inclined surface 121 in the shape of an umbrella surface, and the blades 11 are arranged on the circular arc inclined surface 121 in a uniform interval; the part away from the end of the air inlet 30 of the body 12 is provided with a connecting rod 122, and the connecting rod 122 is provided with a shaft hole 123 connected with the rotating shaft 21 of the motor 2 in the middle. The body 12 designed in this way can improve the rotating performance of the fan blade 1 and improve the stability of rotation.

[0048] The number of the blades 11 of the utility model can be three or more than three, which are arranged on the circular arc inclined surface 121 in a uniform interval. Since the blades 11 are curved, all the blades 11 arranged on the circular arc inclined surface 121 present a rotating radial shape. The blades 11 as air guides are of the same size and style, which can make the fan blade 1 rotate more stably and generate uniform centrifugal force.

[0049] In order to optimize the flow splitting effect of the fan and improve the air outlet performance, considering the complex air flow in the arc structure region formed by the adjacent two blades 11, especially near the suction side of the tail of the blade 11, there is a serious air flow separation phenomenon, which will lead to the formation of a wake region where low-energy flow accumulates, thereby affecting the air outlet performance of the fan. Therefore, in order to achieve better flow splitting effect, as shown in the utility model, the blade 11 can be designed to include long blades 1101 and short blades 1102, the long blades 1101 and the short blades 1102 are arranged alternately on the circular arc inclined surface 121, wherein the long blades 1101 are the wind guide blades 11, that is, responsible for forming a low pressure area and discharging the air sucked in to the surrounding, and the short blades 1102 are arranged at the arc structure region between the adjacent two blades 11 and close to the tail of the long blades 1101. Through the short blades 1102, the wake region of the tail of the long blades 1101 can be broken and reduced, the short blades 1102 play a role of adding power to the air near the outlet of the suction surface, thereby effectively preventing the occurrence of flow separation and improving the stability of the flow field. Moreover, the addition of the short blades 1102 can change the flow path of the air, making it flow more smoothly through the arc structure region, reducing the energy loss caused by air flow separation, thereby significantly improving the fan total pressure. Figure 5

[0050] Further in order to more effectively share the load and avoid excessive fluid blockage and energy loss, as shown in the utility model, the height of the short blades 1102 of this embodiment is lower than the height of the long blades 1101, which can improve the fluid dynamics characteristics and reduce the diffusion effect. The short blades 1102 are shorter than the long blades 1101, so they are closer to the circular arc inclined surface 121, thereby more effectively flushing the wake of these critical areas; and the shorter short blades 1102 can more easily mix with the main flow fluid, reducing the formation of separation zones. Figure 5

[0051] In order to make the air outlet effect better at the gap between the distal end surface 112 and the inner side wall 312 of the fan housing 3, as shown in the utility model, the distal end surface 112 of the blade 11 is designed as an inclined surface, wherein the diameter of the arc line where the distal end surface 112 intersects with the top end surface 113 is greater than the diameter of the arc line where the distal end surface 112 intersects with the circular arc inclined surface 121, that is, according to Figure 6 Figure 6 ​​​In terms of direction, the distal end face 112 is inclined downwards towards the central axis. This ensures that the upper flow rate of the air discharged from the tail of the blade 11 that impacts the inner wall 312 of the fan casing 3 is less than the lower flow rate, thereby reducing flow turbulence at this gap and making the air turn more smoothly, ensuring that energy is not significantly lost. Furthermore, the height of the blade 11 gradually decreases smoothly radially outwards along the axis of the arc-shaped inclined surface 121, that is, the closer to the tail of the blade 11, the lower its height. This design allows the air to be better concentrated at the tail of the blade 11, reducing energy loss caused by airflow separation, and also improving the static pressure capacity at the outlet of the blade 11.

[0052] like Figure 6 As shown, the tip surface 113 of the blade 11 in this embodiment is an inclined surface that curves from the inward-curved air guide surface 114 to the outward-curved air guide surface 114. Therefore, it can better guide the air at the tip of the blade 11 to the arc-shaped structural area formed by the two adjacent blades 11. Furthermore, the higher edge of the tip surface 113 is closely fitted with the inner wall surface 311 around the air inlet 30 of the fan housing 3. Here, "closely fitted" means that the tip surface 113 is infinitely close to the inner wall surface 311 but does not contact it. In this way, the two will not come into contact and generate friction, and the gap between them is very small so that there is no air leakage. Therefore, it can avoid the loss and confusion of airflow, and the noise level generated by the fan blade 1 during operation is significantly lower than that of a traditional fan, so that the electric heating product can operate relatively quietly and reduce noise interference.

[0053] The arc-shaped inclined surface 121 of this invention can be an inclined surface with its cross-sectional edge being an inclined straight line. However, in order to make the air flow more smoothly through the arc-shaped structural area formed by the two adjacent blades 11, a preferred solution is as follows: Figure 4 As shown, the arc-shaped inclined surface 121 of the body 12 in this embodiment is an arc-shaped curved surface with a centrally sunken cross-section edge that is an arc-shaped line; correspondingly, the inner wall surface 311 around the air inlet 30 is an arc-shaped curved surface parallel to the arc-shaped inclined surface 121.

[0054] like Figure 2 As shown, the fan housing 3 in this embodiment includes a fan blade sleeve 31 and a motor base 32. The fan blade sleeve 31 is fitted over the outside of the fan blade 1. A gap is left between the inner sidewall 312 of the fan blade sleeve 31 and the outer contour of the fan blade 1. An air inlet 30 is formed on the fan blade sleeve 31. When viewed in the direction perpendicular to the axis of the fan blade sleeve 31, the edge of the air inlet 30 substantially coincides with the edge of the near end face 111 of the blade 11 of the fan blade 1. Figure 1As shown, the design can achieve better air suction effect. The motor base 32 is fixedly connected with the fan blade sleeve 31 at the opposite end away from the air inlet 30, and the connection mode can be plug-in, threaded rotation, rotary clamping, etc. In this embodiment, the plug-in mode is used for connection, and the buckle 4 is additionally buckled during plug-in, thereby enhancing the connection firmness and effectively avoiding disconnection due to vibration caused by fan operation. The motor base 32 of this embodiment is in the form of a cylinder with both ends open, and the installation plate 321 is arranged at the middle position of the open end of the motor base 32 connected with the fan blade sleeve 31. The outer contour of the installation plate 321 forms a gap with the inner wall of the motor base 32, and the outer contour of the installation plate 321 extends four narrow-width rib bars 322 to be fixedly connected with the inner wall of the motor base 32. The narrow-width rib bars 322 can effectively reduce the air resistance in the air duct. Specifically, a through hole 323 is formed in the center of the installation plate 321, four screw holes 324 are formed in the plate surface of the installation plate 321, the motor 2 is arranged in the motor base 32 from the open end away from the fan blade sleeve 31, and the motor 2 is locked with the motor base 32 by the screw 5 passing through the screw holes 324. The through hole 323 in the installation plate 321 can be passed through by the connecting rod 122 of the fan blade 1.

[0055] The fan has simple structure, the fan blade 1 is designed ingeniously, and the overall volume is small, so the fan can be applied to various electric heating products, such as hot air pens and electric irons used in the electronic industry field, and hot air fans and heat dissipation fans used in the household electrical appliance field. The use of the fan can effectively improve the heating or heat dissipation performance of the electric heating product, and also improves the user experience, so that the electric heating product can maintain high performance while still maintaining the characteristics of compactness and lightness, and can meet more diversified user needs.

[0056] In the description of the present specification, the description referring to the terms "embodiment", "example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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.

[0057] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fan for use on an electric heating product comprising a motor and a fan blade, the motor having an axis of rotation connected to the fan blade, characterised in that: The fan further comprises a fan housing, the motor is connected at a center position of the fan housing, and a wind channel is formed between the motor and an inner wall of the fan housing; the fan blade is located at an air inlet of the fan housing, and a blade of the fan blade is arranged in an inclined manner along a direction away from an axis of the fan blade and a radial direction away from the axis; the blade comprises a proximal end surface close to the axis, a distal end surface away from the axis, a top end surface facing the air inlet, and two air guide surfaces for guiding air; the air guide surfaces are curved arc surfaces curved along a length direction; and a gap is formed between the distal end surface and the inner wall of the fan housing.

2. A fan for use on an electric heating product as claimed in claim 1, characterised in that, The fan blade further comprises a body, an arc-shaped inclined surface in the shape of an umbrella surface is arranged at a portion of the body close to the air inlet end, and the blade is arranged on the arc-shaped inclined surface in a spaced manner; a connecting rod is arranged at a portion of the body away from the air inlet end, and an axle hole connected with a rotating shaft of the motor is formed in the connecting rod.

3. A fan for use on an electric heating product as claimed in claim 2, characterised in that, The blade comprises long blades and short blades, and the long blades and the short blades are arranged on the arc-shaped inclined surface in an alternating manner.

4. A fan for use on an electric heating product as claimed in claim 3, characterised in that, The height of the short blades is lower than the height of the long blades.

5. A fan for use on an electric heating product as claimed in any one of claims 2 to 4, characterised in that, The distal end surface of the blade is an inclined surface, and a diameter of an arc line where the distal end surface intersects with the top end surface is greater than a diameter of an arc line where the distal end surface intersects with the arc-shaped inclined surface.

6. A fan for use on an electric heating product as claimed in any one of claims 2 to 4, characterised in that, The height of the blade gradually and smoothly decreases along a radial direction of the arc-shaped inclined surface.

7. A fan for use on an electric heating product as claimed in any one of claims 1 to 4, characterised in that, The top end surface of the blade is an inclined surface inclined from the air guide surface curved inward to the air guide surface curved outward, and a higher edge of the top end surface is close to an inner wall surface of a periphery of the air inlet of the fan housing.

8. A fan for use on an electric heating product as claimed in claim 2, characterised in that, The arc-shaped inclined surface is an arc-shaped curved surface with a middle portion sunken and a cross-sectional edge in the shape of an arc line; and an inner wall surface of a periphery of the air inlet end corresponds to an arc-shaped curved surface parallel to the arc-shaped inclined surface.

9. The fan for use on an electric heating product of claim 1, wherein, The fan housing comprises a fan blade sleeve and a motor seat, the fan blade sleeve is sleeved outside the fan blade, a gap is left between an inner wall of the fan blade sleeve and an outer contour of the fan blade, the air inlet is arranged on the fan blade sleeve, and the motor seat is fixedly connected with the fan blade sleeve at an opposite end away from the air inlet; the motor is installed at a center position of the motor seat, and a wind channel is formed between the motor and an inner wall of the motor seat.

10. A fan for use on an electric heating product as claimed in claim 9, characterised in that, The motor seat is in the shape of a cylinder with both ends open, an installation plate is arranged at a middle position of an opening of the motor seat at the end connected with the fan blade sleeve, a gap is formed between an outer contour of the installation plate and an inner wall of the motor seat, and a rib with a small width is extended from the outer contour of the installation plate and fixedly connected with the inner wall of the motor seat; and the motor is fixedly installed on the installation plate.

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