fan

Abstract

The application relates to the technical field of household appliances, and discloses a fan, which comprises a main air duct, a main flow channel is formed in the main air duct; a ring-shaped air duct is connected to one end of the main air duct, the ring-shaped air duct comprises a first ring-shaped inner wall and a first ring-shaped outer wall, a ring-shaped flow channel is formed between the first ring-shaped inner wall and the first ring-shaped outer wall, a center flow channel is formed on the inner side of the first ring-shaped inner wall, the first ring-shaped inner wall comprises a first ring-shaped side wall, a ring-shaped connecting wall and a second ring-shaped side wall, the first ring-shaped side wall is arranged on the outer circumferential side of the second ring-shaped side wall and is spaced apart from the second ring-shaped side wall; a heating assembly is arranged in the ring-shaped flow channel; a wind deflector assembly comprises a wind deflector support, a wind deflector cover plate and a plurality of wind deflectors. The application avoids that the heat of the heating assembly is directly transmitted to the wind deflector cover plate, the wind deflector and other components in the center flow channel, so that the wind deflector cover plate, the wind deflector and other components in the center flow channel are deformed or aged due to frequent temperature changes or excessively high temperature.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, specifically to fans. Background Technology

[0002] Related technologies disclose a head assembly, including an air duct assembly, a heating element, and a housing. The air duct assembly includes a main air duct, a central air duct, and an annular air duct. The central air duct and the annular air duct are located at the same end of the main air duct, with the annular air duct surrounding the outer periphery of the central air duct. The heating element is located in the annular air duct. The central air duct has a guide vane assembly, which includes a first mounting bracket and a guide vane. The guide vane is rotatably mounted in the central air duct and has a closed position for closing the central air duct and an open position for opening the central air duct. In the aforementioned related technologies, heat from the heating element is easily transferred to the guide vane assembly within the central air duct, causing deformation and aging of components such as the first mounting bracket and the guide vane due to frequent temperature changes or excessively high temperatures. Summary of the Invention

[0003] In view of this, the present invention provides a fan to solve the problem in the related art where the heat of the heating component is easily transferred to the air guide plate assembly in the central air duct, causing the first mounting bracket, air guide plate and other components of the air guide plate assembly to deform and age due to frequent temperature changes or excessively high temperatures.

[0004] This invention provides a nose assembly, comprising: Main air duct, within which a main airflow channel is formed; An annular air duct is connected to one end of the main air duct. The annular air duct includes a first annular inner wall and a first annular outer wall. An annular flow channel is formed between the first annular inner wall and the first annular outer wall. A central flow channel is formed on the inner side of the first annular inner wall. The annular flow channel and the central flow channel are both connected to the main air duct. The first annular inner wall includes a first annular side wall, an annular connecting wall, and a second annular side wall. The first annular side wall is disposed on the outer periphery of the second annular side wall and the first annular side wall and the second annular side wall are spaced apart. One end of the annular connecting wall is connected to the first annular side wall, and the other end of the annular connecting wall is connected to the second annular side wall. The heating element is disposed in the annular flow channel; An air guide plate assembly includes an air guide plate bracket, an air guide plate cover, and multiple air guide plates. The multiple air guide plates are located between the air guide plate bracket and the air guide plate cover. The air guide plate bracket and the air guide plate cover are fixedly connected. The multiple air guide plates are rotatably disposed in the central flow channel and have a closed position for closing the central flow channel and an open position for opening the central flow channel. The air guide plate cover includes a first annular connecting portion and a first annular protrusion. The first annular connecting portion is disposed on the side of the second annular sidewall facing the main air channel, and the first annular protrusion is disposed on the outer peripheral side and / or inner peripheral side of the first annular connecting portion. The first annular protrusion abuts against both the first annular sidewall and the second annular sidewall, and the first annular sidewall, the annular connecting wall, the second annular sidewall, and the first annular protrusion together form an isolation gap.

[0005] Beneficial effects: Multiple air guide vanes are rotatably mounted in the central flow channel, with both a closed and an open position for closing the central flow channel. In warm air mode, the vanes close the central flow channel, the heating element operates, and the airflow enters the main flow channel and flows to the annular flow channel. All airflow is confined within the annular flow channel and concentrated through the heating element, resulting in concentrated hot air flow and improved outlet temperature and heating efficiency. In cold air mode, the vanes open the central flow channel, the heating element does not operate, and the airflow enters the main flow channel and flows to both the central and annular flow channels, ensuring sufficiently strong and large-volume cold air. By setting up vane supports and cover plates, the vanes can be limited, effectively preventing them from shifting when impacted by airflow and ensuring that each vane can precisely switch between the open and closed positions. The air guide plate assembly includes an air guide plate, an air guide plate bracket, and an air guide plate cover. The air guide plate bracket and the air guide plate cover are fixedly connected, and the air guide plate assembly can be pre-assembled into a whole.

[0006] The first annular connecting part of the air guide plate cover is arranged at the end of the second annular sidewall facing the main air duct. Using the end face of the second annular sidewall as the assembly reference, the assembly position is more precise. The first annular protrusion abuts against both the first and second annular sidewalls. With the first annular protrusion as the reference, both the first and second annular sidewalls abut against the first annular protrusion, making the assembly position more precise. It can also limit the axial movement of the air guide plate cover, preventing it from axially shifting towards the side where the second annular sidewall is located. This firmly locks the axial dimension of the central flow channel, prevents deformation of the air duct cross-section, ensures stable rotation space for the air guide plate, and avoids interference between the air guide plate and the sidewall of the central flow channel.

[0007] In addition, an isolation gap is formed between the first annular sidewall, the annular connecting wall, the second annular sidewall, and the first annular protrusion. This isolation gap prevents the heat from the heating component from being directly transferred to the air guide plate cover, air guide plate and other components in the central flow channel, which would otherwise deform or age due to frequent temperature changes or excessively high temperatures. It also prevents the heat from the heating component from being directly transferred to the central flow channel, reducing heat loss in the annular flow channel.

[0008] In one alternative embodiment, the second annular sidewall is parallel to the first annular sidewall; And / or, along the radial direction of the annular air duct, the distance between the first annular outer wall and the first annular side wall is D1, 23cm≤D1≤50cm; And / or, the distance between the first annular sidewall and the second annular sidewall is D2, 8cm≤D2≤13cm; And / or, the distance between the second annular sidewall and the axis of the central flow channel is D3, 90cm≤D3≤115cm.

[0009] Beneficial effects: If D1 < 23cm, the distance between the outer wall and the side wall of the first annular ring is too small, resulting in a small ventilation area of ​​the annular flow channel. This leads to excessively high airflow velocity as the airflow passes through the annular flow channel. Since the heating element is located inside the annular flow channel, this causes a sharp increase in wind resistance, easily resulting in turbulent airflow and uneven air distribution. This hinders airflow around the heating element, preventing heat accumulation and timely removal, which can easily lead to localized high temperatures. Furthermore, the narrow annular flow channel makes maintenance of the heating element difficult. If D1 > 50cm, the overall size of the annular flow channel becomes too large, failing to meet the requirements for miniaturization and lightweighting of the fan. An excessively wide annular flow channel also leads to airflow dispersion, low velocity, and reduced hot air delivery distance. Therefore, by limiting D1 to 50cm (23cm ≤ D1 ≤ 50cm), the heat generated by the heating element can be evenly distributed with the airflow, improving the uniformity of hot air and heat exchange efficiency. Sufficient space is also provided for the installation and maintenance of the heating element, while ensuring a compact and neat fan head.

[0010] When D2 < 8cm, the air temperature in the isolation gap is high after the heat from the heating element radiates to it, causing the materials of the first annular sidewall, annular connecting wall, second annular sidewall, and first annular protrusion to easily deform and age. When D2 > 13cm, the isolation gap occupies a large proportion of the entire air duct assembly, resulting in a larger fan head volume, larger overall components, increased material costs, reduced structural strength, and also affecting the overall aesthetics. Therefore, by limiting 8cm ≤ D2 ≤ 13cm, the isolation gap has sufficient radial dimensions, thus preventing the heat from the heating element from being directly transferred to components such as the air guide plate cover and air guide plate in the central flow channel. This prevents the air guide plate cover and air guide plate in the central flow channel from deforming and aging due to frequent temperature changes or excessively high temperatures. It also prevents the heat from the heating element from being directly transferred to the central flow channel, reducing heat loss in the annular flow channel.

[0011] D3 is the radial dimension of the central flow channel. If D3 < 90 cm, the radial dimension of the central flow channel is too small, resulting in insufficient ventilation area and limited airflow of cold air, leading to low fan output air volume and difficulty in meeting large-area air supply needs. If D3 > 115 cm, the radial dimension of the central flow channel is too large, which not only increases the size of the fan head but also causes the airflow in the central flow channel to be too dispersed, resulting in poor airflow concentration, insufficient air delivery distance, and an excessively large size of the air guide plate assembly. This reduces the stability and accuracy of rotation adjustment, and can easily cause jamming and incomplete closure during rotation. Therefore, by limiting D3 to 115 cm (90 cm ≤ D3 ≤ 90 cm), the central flow channel can have a reasonable ventilation area, ensuring a large and stable flow of cold air in the center, which, together with the rotatable air guide plate, allows for precise airflow control; and it also strictly controls the size of the fan head, ensuring stable operation of the air guide plate assembly.

[0012] In one optional embodiment, along the radial direction of the annular air duct, the distance between the first annular outer wall and the first annular side wall is D1, the distance between the first annular side wall and the second annular side wall is D2, and the distance between the second annular side wall and the axis of the central flow channel is D3, where 0.18 < D1 / (D2+D3) < 0.67. And / or, 0.06 < D2 / D3 < 0.14; And / or, 1.77 < D1 / D2 < 6.25.

[0013] Beneficial effects: If D1 / (D2+D3)≤0.18, it means that the radial dimension D1 of the annular flow channel is too small relative to the overall dimensions D2 and D3. The ventilation area of ​​the annular flow channel is much smaller than that of the central flow channel, resulting in excessively fast airflow velocity when the airflow passes through the annular flow channel. Since the heating components are arranged inside the annular flow channel, this will lead to a sharp increase in wind resistance, which can easily cause airflow turbulence and uneven airflow. This will result in poor airflow around the heating components, and the heat will accumulate and cannot be carried away in time, which can easily lead to local high temperature. At the same time, the narrow annular flow channel is not conducive to the maintenance of the heating components. If D1 / (D2+D3)≥0.67, it means that the radial dimension of the annular flow channel is relatively too large, resulting in an excessively large overall size of the annular air duct, which does not meet the requirements of fan miniaturization and lightweighting. An excessively wide annular flow channel will also lead to airflow dispersion, excessively low flow velocity, and reduced hot air delivery distance. Therefore, by limiting 0.18 < D1 / (D2+D3) < 0.67, the heat generated by the heating element can be evenly discharged with the airflow, improving the uniformity of hot air and heat exchange efficiency, while reserving sufficient space for the installation and maintenance of the heating element, and ensuring that the fan head is compact and neat.

[0014] If D2 / D3 ≤ 0.06, the radial dimension D2 of the isolation gap is too small relative to the radius D3 of the central flow channel, resulting in insufficient insulation gap thickness and high air temperature within the isolation gap. This leads to easy deformation and aging of the materials of the first annular sidewall, annular connecting wall, second annular sidewall, and first annular protrusion. If D2 / D3 ≥ 0.14, the isolation gap is too large relative to the central flow channel, resulting in a large proportion of the isolation gap in the entire air duct assembly. This leads to an oversized fan head, causing the overall components to be larger, increasing material costs, reducing structural strength, and affecting overall aesthetics. Therefore, by limiting D2 / D3 to 0.06 < D2 / D3 < 0.14, the isolation gap has sufficient radial dimension. This prevents heat from the heating component from being directly transferred to components such as the air guide plate and air guide plate in the central flow channel, thus avoiding deformation and aging of these components due to frequent temperature changes or excessively high temperatures. It also prevents heat from the heating component from being directly transferred to the central flow channel, reducing heat loss within the annular flow channel.

[0015] If D1 / D2 ≤ 1.77, the difference between the radial dimension D1 of the annular flow channel and the radial dimension D2 of the insulation gap is too small. The insulation gap is too large and the hot air flow channel is too narrow, resulting in insufficient effective ventilation area of ​​the annular air channel. The heat generated by the heating element cannot be quickly and smoothly discharged, and the heat accumulates around the heating element, easily leading to localized high temperatures. If D1 / D2 ≥ 6.25, the radial ventilation dimension of the annular flow channel is much larger than the insulation gap dimension. The insulation gap is too narrow and cannot form an effective air insulation layer. The air temperature in the insulation gap is high, causing the materials of the first annular sidewall, the annular connecting wall, the second annular sidewall, and the first annular protrusion to easily deform and age. Therefore, by limiting 1.77 < D1 / D2 < 6.25, sufficient ventilation space can be ensured in the annular flow channel, allowing the heat from the heating element to be carried away by the airflow in a timely manner, thus improving heating efficiency. At the same time, it can prevent the heat from the heating element from being directly transferred to components such as the air guide plate cover and air guide plate in the central flow channel, which would otherwise cause deformation and aging of these components due to frequent temperature changes or excessively high temperatures.

[0016] In one optional embodiment, the second annular sidewall is provided with a plurality of first engaging portions spaced apart circumferentially, and the first annular protrusion or the first annular connecting portion is provided with a second engaging portion on the side facing the annular connecting wall, which is engaged one-to-one with the first engaging portions.

[0017] Beneficial effects: The air guide plate cover achieves multi-point circumferential locking and fixation by relying on the second locking part and the first locking part on the second annular side wall of the first annular inner wall of the annular air duct, simplifying the assembly process. During assembly, only alignment and pressing are required to lock it, greatly improving assembly efficiency. The first annular inner wall and the air guide plate cover are connected by the locking parts, which facilitates the subsequent disassembly and separation of the annular air duct and the air guide plate assembly, thereby facilitating the inspection or cleaning of the heating components. In addition, the multiple first locking parts are arranged circumferentially to ensure a stable connection between the air guide plate cover and the first annular inner wall, effectively resisting the vibration caused by repeated airflow impacts and ensuring that the air guide plate cover is firmly attached to the first annular inner wall for a long time, resulting in higher structural connection reliability.

[0018] Furthermore, the second engaging portion is located on the side of the first annular protrusion or the first annular connecting portion facing the annular connecting wall, which can ensure that the second engaging portion can stably engage with the first engaging portion.

[0019] In one optional embodiment, when the second engaging portion engages with the first engaging portion, the second annular sidewall abuts against the first annular protrusion, and the inner surface of the second annular sidewall smoothly connects with the inner surface of the first annular connecting portion.

[0020] Beneficial effects: When the second engaging part engages with the first engaging part, the second annular sidewall abuts against the first annular protrusion, and the inner surface of the second annular sidewall smoothly connects with the inner surface of the first annular connecting part, which makes the airflow less resistant when flowing in the central channel, avoids eddies and air volume loss, and ensures smooth cold air delivery in the central channel.

[0021] In one optional embodiment, the heating component includes a heating element support, the heating element support having a plurality of seventh engaging portions spaced apart along its circumference, the air guide plate support being located on the side of the air guide plate cover facing the main air duct, and the air guide plate support having an eighth engaging portion that engages one-to-one with the seventh engaging portions.

[0022] Beneficial effects: The heating element bracket achieves multi-point circumferential locking and fixation through the seventh locking part and the eighth locking part on the air guide plate bracket. Assembly only requires alignment and pressing to complete the locking process, simplifying the assembly flow, improving assembly efficiency, and reducing labor assembly costs. Furthermore, the air guide plate cover in the integrated air guide plate assembly locks with the first annular inner wall of the annular air duct, and the air guide plate bracket locks with the heating element located in the annular air duct, thus achieving a stable connection between the annular air duct, the heating element, and the air guide plate assembly. In addition, the heating element bracket has multiple seventh locking parts spaced apart circumferentially, and the air guide plate bracket has eighth locking parts that correspond one-to-one with the seventh locking parts. These multiple circumferential locking points support the heating element bracket, ensuring that it does not tilt and cause localized overheating.

[0023] In one optional embodiment, the air guide plate bracket includes a second central connecting portion and a second annular connecting portion, the air guide plate is rotatably disposed between the second central connecting portion and the second annular connecting portion, the second annular connecting portion includes an annular rib, the annular rib extends along the axial direction of the annular air duct and is located on the outer periphery of the first annular connecting portion. The eighth engaging portion is provided on the annular rib plate, and / or the annular rib plate abuts against the first annular protrusion, and / or the outer periphery of the annular rib plate is provided with a connecting rib plate extending radially outward, and the connecting rib plate abuts against the end of the heating element support.

[0024] Beneficial effects: The second annular connecting part is equipped with an axially extending annular stiffener, which enhances the structural strength of the air guide plate bracket while providing a large contact area between the second annular connecting part and the heating element bracket. The eighth engaging part is located on the annular stiffener, ensuring a secure engagement between the eighth engaging part and the seventh engaging part of the heating element bracket. The annular stiffener extends axially along the annular air duct, acting as a heat insulation baffle to prevent the radiant heat generated by the heating components on the outer annular air duct from being conducted inward, further reducing the ambient temperature in the central flow channel area. This effectively protects the inner air guide plate and other plastic parts, slows down high-temperature aging, and extends the service life of the air guide plate assembly. The annular stiffener abuts against the first annular protrusion, effectively positioning the air guide plate bracket in the axial direction.

[0025] The connecting stiffeners extending radially outward form an end-face abutment with the end of the heating element support, creating a rigid limit in the axial direction. This precisely restricts the axial movement of the heating element support towards the main air duct, preventing the heating component from axially shifting under continuous airflow impact. It ensures that a fixed safe distance is always maintained between the heating element and the annular grille, preventing the heating element from getting too close to the grille and causing local overheating, further avoiding high-temperature safety hazards.

[0026] In one alternative embodiment, a heat-insulating gap is formed between the first annular connecting portion and the second annular connecting portion.

[0027] Beneficial effects: The heat insulation gap formed between the first annular connecting part and the second annular connecting part can prevent the heat of the heating component from being directly transferred to the air guide plate cover, air guide plate and other components in the central flow channel, thus preventing deformation and aging of the air guide plate cover, air guide plate and other components in the central flow channel due to frequent temperature changes or excessive temperature. It can also prevent the heat of the heating component from being directly transferred to the central flow channel, reducing heat loss in the annular flow channel.

[0028] In one optional embodiment, the main air duct includes a cylindrical peripheral wall and an end wall disposed at the end of the cylindrical peripheral wall. The outer peripheral side of the end wall is provided with a plurality of ninth engaging portions spaced apart along the circumferential direction, and the first annular outer wall is provided with a tenth engaging portion that engages with each of the ninth engaging portions.

[0029] Beneficial effects: By setting multiple ninth engaging parts circumferentially on the outer periphery of the end wall, which correspond one-to-one with the tenth engaging parts on the outer wall of the first annular structure, screwless and rapid assembly between the main air duct and the annular air duct is achieved, effectively shortening assembly time and reducing assembly costs. The annular air duct is connected to the main air duct via snap-fit ​​connections. When the heating element needs to be replaced, the annular air duct can be quickly separated from the main air duct and engages with the heating element bracket and the air guide plate bracket. The inner wall of the first annular structure engages with the air guide plate cover. When disassembling the annular air duct and the internal heating element, it is not necessary to disassemble the air guide plate assembly.

[0030] In one optional embodiment, the cylindrical peripheral wall is provided with a guide vane at one end facing the annular air duct, and a connecting plate is provided at the center of the guide vane. The connecting plate is positioned with the guide plate bracket by a positioning structure and connected by fasteners.

[0031] Beneficial effects: By setting guide vanes, the airflow after passing through the fan blades can be guided to flow axially along the air duct assembly, thereby increasing the air delivery distance. By setting a connecting plate at the center of the guide vanes, the connecting plate and the air guide plate bracket are positioned by a positioning structure and connected by fasteners, the center of the air guide plate assembly can be fixed. Combined with the engagement of the heating element bracket and the air guide plate bracket, and the engagement of the first annular inner wall with the air guide plate cover, the entire air guide plate assembly can be stably fixed. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a cross-sectional view of a fan according to an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Figure 4 This is a cross-sectional view of a fan without a second grille according to an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of point C in the middle; Figure 6 This is a schematic diagram of a ring-shaped air duct; Figure 7 This is a schematic diagram of a ring-shaped grille; Figure 8 This is a schematic diagram showing the assembly of the annular grille and the annular air duct. Figure 9 Schematic diagram of the air guide plate bracket Figure 1 ; Figure 10 Schematic diagram of the air guide plate bracket Figure 2 ; Figure 11 Schematic diagram of the air guide plate cover Figure 1 ; Figure 12 Schematic diagram of the air guide cover. Figure 2 ; Figure 13 This is a schematic diagram of the heating element support; Figure 14 This is a schematic diagram of the heating element assembly and the air guide plate bracket after assembly. Figure 15 This is a schematic diagram of the air guide plate assembly and the annular air duct after assembly. Figure 16 A schematic diagram of the main air duct; Figure 17 This is a cross-sectional view of the air guide plate assembly.

[0034] Explanation of reference numerals in the attached figures: 1. Main air duct; 101. Cylindrical peripheral wall; 102. End wall; 103. Ninth locking part; 104. Guide vane; 105. Connecting plate; 1051. Second mounting hole; 1052. Positioning hole; 2. Annular air duct; 201. First annular inner wall; 2011. First annular side wall; 2012. Annular connecting wall; 2013. Second annular side wall; 202. First annular outer wall; 203. Third locking part; 204. Fourth locking part; 205. First locking part; 206. Tenth locking part; 3. Heating component; 301. Heating element bracket; 3011. Seventh locking part; 302. Heating element; 4. Annular grille; 401. Fifth locking part; 402. Sixth locking part; 5. Guide plate bracket; 501. Second central connecting part; 502. 5021. Annular connecting part; 5022. Connecting rib; 5023. Eighth engaging part; 503. Second connecting rib; 504. Second slot; 505. First mounting hole; 506. Second mounting post; 507. Positioning post; 6. Air guide plate cover; 601. First central connecting part; 602. First annular connecting part; 603. First connecting rib; 604. First slot; 605. First mounting post; 606. Second engaging part; 608. First annular protrusion; 7. Air guide plate; 701. Plate body; 702. Rotating shaft; 8. Rotating component; 9. Drive motor; 10. Drive gear; 11. Motor cover; 1101. Mounting shaft; 12. Main motor; 13. Fan blade; 14. Housing; 15. First grille; 16. Second grille. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] The following is combined Figures 1 to 17 The following describes embodiments of the present invention.

[0040] According to an embodiment of the present invention, a fan is provided, including a main air duct 1, an annular air duct 2, a heating element 3, and an air guide plate assembly.

[0041] The main air duct 1 forms the main airflow channel; the annular air duct 2 is connected to one end of the main air duct 1, such as... Figure 6As shown, the annular duct 2 includes a first annular inner wall 201 and a first annular outer wall 202. An annular flow channel is formed between the first annular inner wall 201 and the first annular outer wall 202. A central flow channel is formed on the inner side of the first annular inner wall 201. Both the annular flow channel and the central flow channel are connected to the main flow channel. The first annular inner wall 201 includes a first annular side wall 2011, an annular connecting wall 2012, and a second annular side wall 2013. The first annular side wall 2011 is disposed on the outer periphery of the second annular side wall 2013 and the first annular side wall 2011 and the second annular side wall 2013 are spaced apart. One end of the annular connecting wall 2012 is connected to the first annular side wall 2011, and the other end of the annular connecting wall 2012 is connected to the first annular side wall 2011. The second annular sidewall 2013; the heating element 3 is disposed in the annular flow channel; the air guide plate assembly includes an air guide plate bracket 5, an air guide plate cover 6 and multiple air guide plates 7, the multiple air guide plates 7 are limited between the air guide plate bracket 5 and the air guide plate cover 6, the air guide plate bracket 5 and the air guide plate cover 6 are fixedly connected, the multiple air guide plates 7 are rotatably disposed in the central flow channel, and have a closed position for closing the central flow channel and an open position for opening the central flow channel. The air guide plate cover 6 includes a first annular connecting part 602 and a first annular protrusion 608. The first annular connecting part 602 is disposed on the side of the second annular sidewall 2013 facing the main air channel 1, and the first annular protrusion 608 is disposed on the outer peripheral side and / or inner peripheral side of the first annular connecting part 602. The first annular protrusion 608 simultaneously abuts against the first annular sidewall 2011 and the second annular sidewall 2013, and the first annular sidewall 2011, the annular connecting wall 2012, the second annular sidewall 2013, and the first annular protrusion 608 form an isolation gap.

[0042] In this embodiment, multiple air guide plates 7 are rotatably disposed in the central flow channel, having a closed position for closing the central flow channel and an open position for opening the central flow channel. In warm air mode, the multiple air guide plates 7 close the central flow channel, the heating element 3 operates, and the airflow enters the main flow channel and flows from the main flow channel to the annular flow channel. All airflow is constrained within the annular flow channel and flows concentratedly through the heating element 3, resulting in concentrated hot air flow and improved outlet air temperature and heating efficiency. In cold air mode, the multiple air guide plates 7 open the central flow channel, the heating element 3 does not operate, and the airflow enters the main flow channel and flows from the main flow channel to the central flow channel and the annular flow channel respectively, and is blown out through the central flow channel and the annular flow channel, ensuring that the cold air is sufficiently strong and the cold air volume is large. By setting the air guide plate bracket 5 and the air guide plate cover 6, the air guide plates 7 are limited by the air guide plate bracket 5 and the air guide plate cover 6, which can effectively prevent the air guide plates 7 from shifting when impacted by airflow, ensuring that each air guide plate 7 can accurately switch between the open and closed positions. The air guide plate assembly includes an air guide plate 7, an air guide plate bracket 5, and an air guide plate cover 6. The air guide plate bracket 5 and the air guide plate cover 6 are fixedly connected, and the air guide plate assembly can be pre-assembled into a whole.

[0043] Furthermore, the first annular connecting part 602 of the air guide plate cover 6 is arranged at one end of the second annular sidewall 2013 facing the main air duct 1. Using the end face of the second annular sidewall 2013 as the assembly reference, the assembly position is more precise. The first annular protrusion 608 abuts against both the first annular sidewall 2011 and the second annular sidewall 2013. With the first annular protrusion 608 as the reference, both the first annular sidewall 2011 and the second annular sidewall 2013 abut against the first annular protrusion 608, making the assembly position more precise. It can also limit the axial movement of the air guide plate cover 6, preventing the air guide plate cover 6 from axially shifting towards the side where the second annular sidewall 2013 is located. This firmly locks the axial dimension of the central flow channel, prevents deformation of the air duct cross-section, ensures the stability of the rotation space of the air guide plate 7, and prevents interference between the air guide plate 7 and the sidewall of the central flow channel.

[0044] Furthermore, the first annular protrusion 608 abuts against the first annular sidewall 2011 and the first annular protrusion 608 abuts against the second annular sidewall 2013. The first annular sidewall 2011, the annular connecting wall 2012, the second annular sidewall 2013, and the first annular protrusion 608 form an isolation gap. This isolation gap can prevent the heat of the heating component 3 from being directly transferred to the air guide cover 6, air guide 7 and other components in the central flow channel, which would otherwise cause deformation and aging of the air guide cover 6, air guide 7 and other components in the central flow channel due to frequent temperature changes or excessively high temperatures. It can also prevent the heat of the heating component 3 from being directly transferred to the central flow channel, reducing heat loss in the annular flow channel.

[0045] It should be noted that "multiple" specifically refers to at least two.

[0046] In one embodiment, the second annular sidewall 2013 is parallel to the first annular sidewall 2011; along the radial direction of the annular air duct 2, the distance between the first annular outer wall 202 and the first annular sidewall 2011 is D1, 23cm≤D1≤50cm; the distance between the first annular sidewall 2011 and the second annular sidewall 2013 is D2, 8cm≤D2≤13cm; and the distance between the second annular sidewall 2013 and the axis of the central flow channel is D3, 90cm≤D3≤115cm.

[0047] In this embodiment, if D1 < 23 cm, the distance between the first annular outer wall 202 and the first annular side wall 2011 is too small, resulting in a small ventilation area of ​​the annular flow channel. This leads to excessively fast airflow velocity when the airflow passes through the annular flow channel. Since the heating element 3 is arranged inside the annular flow channel, this causes a sharp increase in wind resistance, easily resulting in turbulent airflow and uneven air distribution. This makes the airflow around the heating element 3 poor, and the accumulated heat cannot be carried away in time, easily leading to local high temperatures. At the same time, the narrow annular flow channel is not conducive to the maintenance of the heating element 3. If D1 > 50 cm, the overall size of the annular air channel is too large, which does not meet the requirements of fan miniaturization and lightweighting. An excessively wide annular flow channel will also cause airflow dispersion, low velocity, and reduced hot air delivery distance. Therefore, by limiting 23 cm ≤ D1 ≤ 50 cm, the heat generated by the heating element 3 can be evenly discharged with the airflow, improving the uniformity of hot air and heat exchange efficiency, while reserving sufficient space for the installation and maintenance of the heating element 3, and ensuring that the fan head is compact and neat.

[0048] When D2 < 8cm, the heat radiated from the heating component 3 to the isolation gap results in a high air temperature within the gap, causing the materials of the first annular sidewall 2011, annular connecting wall 2012, second annular sidewall 2013, and first annular protrusion 608 to easily deform and age. When D2 > 13cm, the isolation gap occupies a large proportion of the entire air duct assembly, leading to a larger fan head volume, resulting in larger overall components, increased material costs, decreased structural strength, and an impact on overall aesthetics. Therefore, by limiting 8cm ≤ D2 ≤ 13cm, the isolation gap has sufficient radial dimensions, thus preventing the heat from the heating component 3 from being directly transferred to components such as the air guide plate cover 6 and air guide plate 7 in the central flow channel. This prevents deformation and aging of components such as the air guide plate cover 6 and air guide plate 7 in the central flow channel due to frequent temperature changes or excessively high temperatures. It also prevents the heat from the heating component 3 from being directly transferred to the central flow channel, reducing heat loss within the annular flow channel.

[0049] D3 is the radial dimension of the central flow channel. If D3 < 90 cm, the radial dimension of the central flow channel is too small, resulting in insufficient ventilation area and limited airflow of cold air, leading to low fan output air volume and difficulty in meeting large-area air supply needs. If D3 > 115 cm, the radial dimension of the central flow channel is too large, which not only increases the size of the fan head but also causes the airflow in the central flow channel to be too dispersed, resulting in poor airflow concentration, insufficient air delivery distance, and an excessively large size of the air guide plate assembly. This reduces the stability and accuracy of rotation adjustment, and can easily cause jamming and incomplete closure during rotation. Therefore, by limiting 90 cm ≤ D3 ≤ 115 cm, the central flow channel can have a reasonable ventilation area, ensuring a large flow rate and stable circulation of central cold air. This, combined with the rotatable air guide plate 7, enables precise airflow control; and it also strictly controls the size of the fan head, ensuring stable operation of the air guide plate assembly.

[0050] In one embodiment, 0.18 < D1 / (D2+D3) < 0.67; and / or, 0.06 < D2 / D3 < 0.14; and / or, 1.77 < D1 / D2 < 6.25.

[0051] In this embodiment, if D1 / (D2+D3)≤0.18, it means that the radial dimension D1 of the annular flow channel is too small relative to the overall dimensions of D2 and D3. The ventilation area of ​​the annular flow channel is much smaller than that of the central flow channel, resulting in excessively fast airflow velocity when the airflow passes through the annular flow channel. Since the heating element 3 is arranged inside the annular flow channel, this will cause a sharp increase in wind resistance, easily leading to airflow turbulence and uneven airflow. This results in poor airflow around the heating element 3, and the heat cannot be carried away in time, easily leading to local high temperature. At the same time, the narrow annular flow channel is not conducive to the maintenance of the heating element 3. If D1 / (D2+D3)≥0.67, it means that the radial dimension of the annular flow channel is relatively too large, resulting in an excessively large overall size of the annular air duct, which does not meet the requirements of fan miniaturization and lightweighting. An excessively wide annular flow channel will also cause airflow dispersion, excessively low velocity, and reduced hot air delivery distance. Therefore, by limiting 0.18 < D1 / (D2+D3) < 0.67, the heat generated by the heating element 3 can be evenly discharged with the airflow, improving the uniformity of hot air and heat exchange efficiency, while also reserving sufficient space for the installation and maintenance of the heating element 3, and ensuring that the fan head is compact and neat.

[0052] If D2 / D3≤0.06, the radial dimension D2 of the isolation gap is too small relative to the radius dimension D3 of the central flow channel, resulting in insufficient insulation gap thickness and high air temperature in the isolation gap. This makes the materials of the first annular sidewall 2011, annular connecting wall 2012, second annular sidewall 2013, and first annular protrusion 608 prone to deformation and aging. If D2 / D3≥0.14, the isolation gap is too large relative to the central flow channel, resulting in a large proportion of the isolation gap in the entire air duct assembly. This leads to an oversized fan head, causing the overall components to be larger, increasing material costs, reducing structural strength, and also affecting the overall aesthetics. Therefore, by limiting 0.06 < D2 / D3 < 0.14, the isolation gap has sufficient size in the radial direction, thereby preventing the heat of the heating component 3 from being directly transferred to components such as the air guide plate 6 and air guide plate 7 in the central flow channel. This would prevent the air guide plate 6 and air guide plate 7 in the central flow channel from deforming or aging due to frequent temperature changes or excessively high temperatures. It would also prevent the heat of the heating component 3 from being directly transferred to the central flow channel, reducing heat loss in the annular flow channel.

[0053] If D1 / D2 ≤ 1.77, the difference between the radial dimension D1 of the annular flow channel and the radial dimension D2 of the isolation gap is too small. The insulation gap is too large and the hot air flow channel is too narrow, resulting in insufficient effective ventilation area of ​​the annular flow channel. The heat generated by the heating element cannot be quickly and smoothly discharged, and the heat accumulates around the heating element, easily leading to local high temperature. If D1 / D2 ≥ 6.25, the radial ventilation dimension of the annular flow channel is much larger than the insulation gap dimension. The isolation gap is too narrow and cannot form an effective air insulation layer. The air temperature in the isolation gap is high, causing the materials of the first annular sidewall 2011, the annular connecting wall 2012, the second annular sidewall 2013, and the first annular protrusion 608 to be prone to deformation and aging. Therefore, by limiting 1.77 < D1 / D2 < 6.25, sufficient ventilation space can be ensured in the annular flow channel, so that the heat of the heating component can be carried away by the airflow in time, improving the heating efficiency. At the same time, it can prevent the heat of the heating component 3 from being directly transferred to components such as the air guide plate 6 and air guide plate 7 in the central flow channel, which would cause deformation and aging of components such as the air guide plate 6 and air guide plate 7 in the central flow channel due to frequent temperature changes or excessively high temperatures.

[0054] In one embodiment, the second annular sidewall 2013 is provided with a plurality of first engaging portions 205 spaced apart along the circumference, and the first annular protrusion 608 or the first annular connecting portion 602 is provided with a second engaging portion 606 on the side facing the annular connecting wall 2012, which is engaged one-to-one with the first engaging portions 205.

[0055] In this embodiment, the air guide plate cover 6 is fixed by multiple circumferential engagements via the second engaging portion 606 and the first engaging portion 205 on the second annular sidewall 2013 of the first annular inner wall 201 of the annular air duct 2. This simplifies the assembly process, requiring only alignment and pressing to lock the plate, significantly improving assembly efficiency. The first annular inner wall 201 and the air guide plate cover 6 are connected by the engaging portions, facilitating the subsequent disassembly and separation of the annular air duct 2 and the air guide plate assembly, thereby facilitating the inspection or cleaning of the heating components. Furthermore, the multiple first engaging portions 205 are arranged circumferentially at intervals, ensuring a stable connection between the air guide plate cover 6 and the first annular inner wall 201. This effectively resists vibrations caused by repeated airflow impacts, ensuring the air guide plate cover 6 remains firmly attached to the first annular inner wall 201 for a long period, resulting in higher structural connection reliability.

[0056] Furthermore, the second engaging portion 606 is provided on the side of the first annular protrusion 608 or the first annular connecting portion 602 facing the annular connecting wall 2012, which can ensure that the second engaging portion 606 can be stably engaged with the first engaging portion 205.

[0057] Specifically, in one embodiment, combined with Figure 6 and Figure 12The first annular inner wall 201 is provided with four first engaging parts 205 evenly distributed along the circumference, and correspondingly, four second engaging parts 606 are provided.

[0058] Preferably, the first annular protrusion 608 is located on the outer periphery of the first annular connecting portion 602 and at the end of the first annular connecting portion 602 away from the main air duct 1. The second engaging portion 606 is located on the first annular protrusion 608. When the second engaging portion 606 engages with the first engaging portion 205, the first annular sidewall 2011 and the second annular sidewall 2013 both abut against the first annular protrusion 608. When the annular air duct 2 is assembled with the air guide plate cover 6, the first annular protrusion 608 is used as the assembly reference, and the assembly position is more accurate.

[0059] In a preferred embodiment, the second annular sidewall 2013 is connected to the annular connecting wall 2012, and the second annular sidewall 2013 is parallel to the first annular sidewall 2011. One end of the annular connecting wall 2012 is connected to the first annular sidewall 2011, and the other end of the annular connecting wall 2012 is connected to the end of the second annular sidewall 2013 away from the main air duct. The first annular protrusion 608 is provided on the outer periphery of the first annular connecting portion 602 and is located at the end of the first annular connecting portion 602 away from the main air duct 1. The second engaging portion 606 is provided on the first annular protrusion 608. When the second engaging portion 606 engages with the first engaging portion 205, both the first annular sidewall 2011 and the second annular sidewall 2013 abut against the first annular protrusion 608.

[0060] In a preferred embodiment, the annular connecting wall 2012 is perpendicular to the first annular sidewall 2011 and the second annular sidewall 2013, respectively, and the first annular protrusion 608 is perpendicular to the first annular connecting portion 602.

[0061] In one embodiment, when the second engaging portion 606 engages with the first engaging portion 205, the second annular sidewall 2013 abuts against the first annular protrusion 608, and the inner surface of the second annular sidewall 2013 smoothly connects with the inner surface of the first annular connecting portion 602.

[0062] In this embodiment, when the second engaging part 606 engages with the first engaging part 205, the second annular sidewall 2013 abuts against the first annular protrusion 608, and the inner surface of the second annular sidewall 2013 smoothly connects with the inner surface of the first annular connecting part 602, so that the airflow has less wind resistance when flowing in the central channel, avoids eddies and air volume loss, and ensures smooth cold air delivery in the central channel.

[0063] In one embodiment, the fan further includes an annular grille 4, which is a metal part. The annular grille 4 is located at one end of the annular air duct 2 away from the main air duct 1, and the annular grille 4 is arranged opposite to the annular air duct.

[0064] In this embodiment, the annular grille 4 is set as an independent metal component, which is different from the plastic grille that is integrally injection molded with the outer shell 14 in related technologies. The metal material has excellent high temperature resistance and can directly withstand the high temperature hot air sent out by the heating component 3. It can effectively avoid the grille from softening, melting and deforming due to long-term scouring by high temperature airflow, eliminate the safety hazards of plastic grille melting or even catching fire at high temperature, and greatly improve the operating safety of the equipment under the warm air condition.

[0065] It should be noted that the annular grille 4 can be integrally formed with the annular air duct 2, or it can be set separately.

[0066] In one embodiment, the first annular inner wall 201 is provided with a plurality of third engaging portions 203 spaced apart circumferentially, and the first annular outer wall 202 is provided with a plurality of fourth engaging portions 204 spaced apart circumferentially, such as... Figure 7 As shown, the inner ring of the annular grille 4 is provided with a fifth engaging part 401 that is engaged with the third engaging part 203, and the outer ring of the annular grille 4 is provided with a sixth engaging part 402 that is engaged with the fourth engaging part 204.

[0067] In this embodiment, the first annular inner wall 201 of the annular air duct 2 is provided with a third engaging portion 203, the first annular outer wall 202 of the annular air duct 2 is provided with a fourth engaging portion 204, the inner ring of the annular grille 4 is provided with a fifth engaging portion 401, and the outer ring of the annular grille 4 is provided with a sixth engaging portion 402, as shown below. Figure 8 As shown, the third engaging part 203 and the fifth engaging part 401 are engaged one-to-one, and the fourth engaging part 204 and the sixth engaging part 402 are engaged one-to-one. The assembly operation between the annular grille 4 and the annular air duct 2 is simple and efficient, and the alignment and assembly of the annular grille 4 and the annular air duct 2 can be completed quickly, improving the overall assembly efficiency and reducing assembly time and cost. The one-to-one engagement of the third engaging part 203 and the fifth engaging part 401, and the one-to-one engagement of the fourth engaging part 204 and the sixth engaging part 402, makes the annular grille 4 an independent and detachable part. When the annular grille 4 is clogged by dirt after long-term use or is damaged by bumps, it can be directly removed and replaced or maintained separately without having to involve other parts, making the later maintenance of the equipment more convenient and the repair and replacement costs lower.

[0068] In addition, multiple third engaging parts 203 are spaced apart along the circumference, and the third engaging parts 203 are engaged with the fifth engaging parts 401 in a one-to-one manner. Multiple fourth engaging parts 204 are spaced apart along the circumference, and the fourth engaging parts 204 are engaged with the sixth engaging parts 402 in a one-to-one manner. This ensures that the annular grille 4 is subjected to uniform force in the circumference and that the annular grille 4 is stably connected to the annular air duct 2.

[0069] Specifically, in one embodiment, combined with Figure 6The third engaging part 203 has 6 engagement parts, which are evenly distributed along the circumference, and the fourth engaging part 204 has 10 engagement parts, which are evenly distributed along the circumference.

[0070] In one specific embodiment, the annular grille 4 is an aluminum component.

[0071] In one embodiment, Figure 14 As shown, the air guide plate 7 includes a plate body 701 and a rotating shaft 702 located at at least one end of the plate body 701. The air guide plate bracket 5 and the air guide plate cover 6 cooperate to limit the rotating shaft 702. The rotating shaft 702 of the air guide plate 7 is clamped and limited by the air guide plate bracket 5 and the air guide plate cover 6, which can effectively prevent the rotating shaft 702 from moving when the air guide plate 7 is impacted by airflow, and ensure that each air guide plate 7 can accurately switch between the open position and the closed position.

[0072] Specifically in one embodiment, such as Figure 11 and Figure 12 As shown, the air guide plate cover 6 includes a first central connecting part 601 and a first annular connecting part 602. The first central connecting part 601 and the first annular connecting part 602 are connected by a plurality of radially arranged first connecting ribs 603. The first central connecting part 601 and / or the first annular connecting part 602 are provided with a plurality of first slots 604 spaced apart circumferentially. Figure 9 and Figure 10 As shown, the air guide plate bracket 5 includes a second central connecting part 501 and a second annular connecting part 502. The second central connecting part 501 and the second annular connecting part 502 are connected by a plurality of radially arranged second connecting ribs 503. The second central connecting part 501 and / or the second annular connecting part 502 are provided with a plurality of second slots 504 at circumferential intervals. The second slots 504 correspond one-to-one with the first slots 604. Each rotating shaft 702 is limited between the first slot 604 and the corresponding second slot 504. The outer frame of the air guide plate cover 6 specifically refers to the first annular connecting part 602, and the outer frame of the air guide plate bracket 5 specifically refers to the second annular connecting part 502.

[0073] In one specific embodiment, the air guide plate 7 further includes a rocker arm (not shown in the figure), and the air guide plate assembly further includes a driving assembly. The driving assembly includes a rotating member 8, which is provided with a plurality of actuating grooves at intervals along the circumference. The rocker arm is disposed in the actuating groove. When the rotating member 8 rotates, it drives the rocker arm to move, thereby driving the air guide plate 7 to rotate.

[0074] Specifically, the rotating component 8 is provided with an engaging part, such as... Figure 3 and Figure 17As shown, the drive structure also includes a drive motor 9 and a drive gear 10. The drive motor 9 is located at the first central connecting part 601, and the drive gear 10 is connected to the output shaft of the drive motor 9. The drive gear 10 meshes with the meshing part. When the drive motor 9 is working, it drives the drive gear 10 to rotate. The drive gear 10 meshes with the meshing part of the rotating member 8, thereby driving the rotating member 8 to rotate, which in turn drives the rocker arm to rotate to a certain extent, thereby simultaneously driving each air guide plate 7 to flip.

[0075] In one embodiment, the rocker arm is connected to one end of the plate 701 near the first central connecting part 601, and the end of the plate 701 away from the first central connecting part 601 is provided with a pivot; or both ends of the plate 701 are provided with pivots 702, and the rocker arm is connected to the pivot 702 at the end of the plate 701 near the first central connecting part 601.

[0076] In one specific embodiment, the air guide plate assembly further includes a motor cover 11, which is fixed to the second central connection part 501. The drive motor 9 is limited between the first central connection part 601 and the motor cover 11. The motor cover 11 is provided with a mounting shaft 1101, and the rotating member 8 is provided with a mounting through hole. The rotating member 8 rotates around the mounting shaft 1101. The mounting shaft 1101 passes through the mounting through hole and is fixed to the second central connection part 501 by fasteners.

[0077] It should be noted that the fasteners are screws or bolts.

[0078] Specifically, the air guide plate bracket 5 and the air guide plate cover 6 are connected by fasteners. (Reference) Figure 10 and Figure 11 The first annular connecting part 602 is provided with a plurality of first mounting posts 605 evenly distributed along the circumference, and the second annular connecting part 502 is provided with corresponding first mounting holes 505, so that the air guide plate bracket 5 and the air guide plate cover plate 6 are connected by fasteners.

[0079] The air guide plate assembly of this embodiment can be pre-assembled into a whole. The assembly process can be as follows: First, the drive motor 9, motor cover 11, drive gear 10, rotating part 8 and air guide plate bracket 5 are pre-assembled together. Then, the air guide plate cover 6 is fixedly connected to the air guide plate bracket 5. Alternatively, the assembly process is as follows: The drive motor 9 is placed on the first central connection part 601. The motor cover 11 is fixed to the first central connection part 601 to limit the drive motor 9, and the output shaft of the drive motor 9 passes through the motor cover 11. Then, the drive gear 10 is assembled on the output shaft of the drive motor 9. The rotating part 8 is sleeved on the mounting shaft 1101 and meshed with the drive gear 10. The rocker arm of each air guide plate 7 is inserted into the actuation groove of the rotating part 8, and the rotating shaft 702 is embedded in the first slot 604. The air guide plate bracket 5 and the air guide plate cover 6 are fixedly connected. Finally, the second central connection part 501 and the mounting shaft 1101 are fixedly connected. The fixed connection method is at least one of the following: snap-fit, screw connection, and bolt connection.

[0080] In one embodiment, combined Figure 5 , Figure 10 and Figure 13 The heating component 3 includes a heating element support 301, which has a plurality of seventh engagement parts 3011 spaced apart along its circumference. The air guide plate support 5 is located on the side of the air guide plate cover 6 facing the main air duct 1, and the air guide plate support 5 has an eighth engagement part 5023 that is engaged with the seventh engagement parts 3011 one by one.

[0081] In this embodiment, the heating element bracket 301 is fixed by a circumferential multi-point engagement with the eighth engagement portion 5023 on the air guide plate bracket 5 via a seventh engagement portion 3011. Assembly only requires alignment and pressing to complete the locking process, simplifying the assembly procedure, improving assembly efficiency, and reducing manual assembly costs. Furthermore, the air guide plate cover 6 in the integrated air guide plate assembly engages with the first annular inner wall 201 of the annular air duct 2, and the air guide plate bracket 5 engages with the heating element 3 disposed in the annular air duct 2, thus firmly connecting the annular air duct 2, the heating element 3, and the air guide plate assembly into a single unit. In addition, the heating element bracket 301 has multiple seventh engagement portions 3011 spaced apart along its circumference, and the air guide plate bracket 5 has eighth engagement portions 5023 that correspond one-to-one with the seventh engagement portions 3011. These multiple circumferential engagement points support the heating element bracket 301, ensuring that the heating element bracket 301 does not tilt and cause localized overheating.

[0082] Specifically, in one embodiment, combined with Figure 10 and Figure 13 The heating element support 301 has four seventh engagement parts 3011 evenly arranged along the circumference, and the air guide plate support 5 has four corresponding eighth engagement parts 5023.

[0083] In one specific embodiment, the heating component 3 further includes a heating element 302 disposed on the outer periphery of the heating element support 301.

[0084] In one embodiment, combined Figure 5 , Figure 10 The air guide plate bracket 5 includes a second central connecting portion 501 and a second annular connecting portion 502. The air guide plate 7 is rotatably disposed between the second central connecting portion 501 and the second annular connecting portion 502. The second annular connecting portion 502 includes an annular rib 5021, which extends axially along the annular air duct 2 and is located on the outer periphery of the first annular connecting portion 602. An eighth engaging portion 5023 is disposed on the annular rib 5021, and / or, the annular rib 5021 abuts against the first annular protrusion 608, and / or, the outer periphery of the annular rib 5021 is provided with a connecting rib 5022 extending radially outward, which abuts against the end of the heating element bracket 301.

[0085] In this embodiment, the second annular connecting portion 502 is provided with an axially extending annular rib plate 5021. While improving the structural strength of the air guide plate bracket 5 itself, the second annular connecting portion 502 has a large contact area with the heating element bracket 301. The eighth engaging portion 5023 is provided on the annular rib plate 5021, which can ensure that the eighth engaging portion 5023 is firmly engaged with the seventh engaging portion 3011 of the heating element bracket 301. The annular rib plate 5021 extends axially along the annular air duct 2 and can act as a heat insulation baffle, which can block the radiant heat generated by the heating component 3 of the outer annular air duct 2 from being conducted inward, further reducing the ambient temperature of the central flow channel area, effectively protecting the plastic parts such as the inner air guide plate 7, slowing down the high-temperature aging rate, and extending the service life of the air guide plate assembly. The annular rib plate 5021 abuts against the first annular protrusion 608, which can effectively position the air guide plate bracket 5 in the axial direction.

[0086] The connecting stiffener 5022 extending radially outward forms an end face abutment with the end of the heating element support 301, forming a rigid limit in the axial direction. This can precisely restrict the axial movement of the heating element support 301 towards the annular grille 4, preventing the heating component 3 from axially shifting under the continuous impact of airflow. This ensures that the heating element and the annular grille 4 always maintain a fixed safe distance, preventing the heating element from getting too close to the grille and causing local overheating, and further avoiding high temperature safety hazards.

[0087] In one embodiment, a heat-insulating gap is formed between the first annular connecting portion 602 and the second annular connecting portion 502.

[0088] In this embodiment, a heat insulation gap is formed between the first annular connecting part 602 and the second annular connecting part 502, which can prevent the heat of the heating component 3 from being directly transferred to the air guide plate cover 6, air guide plate 7 and other components in the central flow channel, thus preventing deformation and aging of the air guide plate cover 6, air guide plate 7 and other components in the central flow channel due to frequent temperature changes or excessively high temperatures. It can also prevent the heat of the heating component 3 from being directly transferred to the central flow channel, reducing heat loss in the annular flow channel.

[0089] In one embodiment, such as Figure 4 As shown, the main air duct 1 includes a cylindrical peripheral wall 101 and an end wall 102 located at the end of the cylindrical peripheral wall 101, as follows: Figure 16 As shown, the outer periphery of the end wall 102 is provided with a plurality of ninth engaging portions 103 spaced apart along the circumferential direction, such as... Figure 6 As shown, the first annular outer wall 202 is provided with a tenth engaging portion 206 that is engaged with the ninth engaging portion 103 in a one-to-one manner.

[0090] In this embodiment, by providing multiple ninth engaging portions 103 circumferentially around the outer periphery of the end wall 102, which correspond one-to-one with the tenth engaging portions 206 on the first annular outer wall 202, screwless and rapid assembly between the main air duct 1 and the annular air duct 2 is achieved, effectively shortening assembly time and reducing assembly costs. The annular air duct 2 is connected to the main air duct 1 by snap-fit. When the heating element 3 needs to be replaced, the annular air duct 2 can be quickly separated from the main air duct 1 and engages with the heating element bracket 301 and the air guide plate bracket 5. The first annular inner wall 201 engages with the air guide plate cover 6. When disassembling the annular air duct 2 and the internal heating element 3, it is not necessary to disassemble the air guide plate assembly.

[0091] In a preferred embodiment, the inner diameter of the end wall 102 gradually increases along the direction close to the annular air duct 2, forming a gradually expanding flow channel. When the airflow enters the annular air duct 2 from the main air duct 1, it can guide and disperse the airflow evenly to the entire interior of the annular air duct 2, ensuring that the airflow is uniform throughout the heating component 3, avoiding excessive or insufficient local airflow, so that the annular heating element is heated evenly and there will be no local dry burning or overheating.

[0092] In one specific embodiment, the main air duct 1 is provided with a main motor 12 and a fan blade 13. The main motor 12 drives the fan blade 13 to rotate, thereby driving the airflow.

[0093] In one embodiment, a guide vane 104 is provided at one end of the cylindrical peripheral wall 101 facing the annular air duct 2, and a connecting plate 105 is provided at the center of the guide vane 104. The connecting plate 105 is positioned with the guide plate bracket 5 through a positioning structure and connected by fasteners.

[0094] In this embodiment, by setting the guide vane 104, the guide vane 104 can guide the airflow after passing through the fan blade 13 into an axial flow along the air duct assembly, thereby increasing the air delivery distance. By setting the connecting plate 105 at the center of the guide vane 104, the connecting plate 105 and the guide plate bracket 5 are positioned by the positioning structure and connected by fasteners, the center of the guide plate assembly can be fixed. With the heating element bracket 301 engaging with the guide plate bracket 5, and the first annular inner wall 201 engaging with the guide plate cover plate 6, the entire guide plate assembly can be stably fixed.

[0095] Specifically, such as Figure 9 and Figure 16 As shown, the connecting plate 105 has two second mounting holes 1051, such as... Figure 9 As shown, the second central connecting part 501 of the air guide plate bracket 5 is provided with a second mounting post 506 on the side facing the connecting plate 105, so that the connecting plate 105 and the air guide plate bracket 5 are connected by fasteners.

[0096] Specifically, the positioning structure includes positioning posts 507 and positioning holes 1052. The connecting plate is provided with four positioning holes 1052. The second central connecting part 501 is provided with four positioning posts 507 on the side facing the connecting plate 105. The positioning posts 507 correspond one-to-one with the positioning holes 1052, and the positioning posts 507 are inserted into the positioning holes 1052.

[0097] In one specific embodiment, the fan further includes a housing 14, which surrounds and is fixed to the outside of the main air duct 1 and the annular air duct 2. It should be noted that the housing 14 can be integrally injection molded from conventional ordinary plastic or segmented molded, eliminating the need to use expensive fire-retardant modified plastic for the entire housing 14, thus reducing costs. Compared with related technologies, the structure of the housing 14 is simpler, facilitating mold manufacturing and reducing costs.

[0098] In one embodiment, the fan further includes a first grille 15 and a second grille 16. The first grille 15 is connected to the housing 14 or the main air duct 1 and is located at one end of the main air duct 1 away from the central flow channel. The second grille 16 is located on the inner circumferential side of the annular grille 4 to prevent the user from touching the air guide plate 7.

[0099] The fan provided in this embodiment can be assembled using the following process: Place the annular grille 4 flat on a table with the side having the fifth engaging part 401 and the sixth engaging part 402 facing upwards. Align the annular air duct 2 with the annular grille 4, so that the third engaging part 203 engages with the fifth engaging part 401, and the fourth engaging part 204 engages with the sixth engaging part 402. Assemble the air guide plate assembly. Engage the heating element 3 with the air guide plate assembly (engage the seventh engaging part 3011 on the heating element bracket 301 with the eighth engaging part 5023 on the air guide plate bracket 5). Then assemble the heating element 3 into the annular air duct 2. When the air guide plate cover 6 is snapped into the annular air duct 2 (the first snap-fit ​​part 205 of the first annular inner wall 201 is aligned and snapped into the second snap-fit ​​part 606 of the air guide plate cover 6), the annular air duct 2, the heating component 3, and the air guide plate assembly form an installation whole. This installation whole is initially fixed by the positioning structure and snap-fit, and then further fixed by screws, as follows: the second central connecting part 501 and the connecting plate 105 are positioned by the positioning structure positioning post 507 and positioning hole 1052, the ninth snap-fit ​​part 103 of the main air duct 1 is aligned and snapped into the tenth snap-fit ​​part 206 on the annular air duct 2, and then the connecting plate 105 and the air guide plate bracket 5 are fixed by fasteners.

[0100] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A fan, characterized in that, include: Main air duct (1), within which a main air duct (1) is formed; An annular air duct (2) is connected to one end of the main air duct (1). The annular air duct (2) includes a first annular inner wall (201) and a first annular outer wall (202). An annular flow channel is formed between the first annular inner wall (201) and the first annular outer wall (202). A central flow channel is formed on the inner side of the first annular inner wall (201). The annular flow channel and the central flow channel are both connected to the main air duct. The first annular inner wall (201) includes a first annular side wall (2011), an annular connecting wall (2012), and a second annular side wall (2013). The first annular side wall (2011) is located on the outer periphery of the second annular side wall (2013), and the first annular side wall (2011) and the second annular side wall (2013) are spaced apart. One end of the annular connecting wall (2012) is connected to the first annular side wall (2011), and the other end of the annular connecting wall (2012) is connected to the second annular side wall (2013). Heating component (3) is disposed in the annular flow channel; The air guide plate assembly includes an air guide plate bracket (5), an air guide plate cover (6), and a plurality of air guide plates (7). The plurality of air guide plates (7) are located between the air guide plate bracket (5) and the air guide plate cover (6). The air guide plate bracket (5) and the air guide plate cover (6) are fixedly connected. The plurality of air guide plates (7) are rotatably disposed in the central flow channel and have a closed position for closing the central flow channel and an open position for opening the central flow channel. The air guide plate cover (6) includes a first annular connecting part (602) and a first annular protrusion (608). The first annular connecting part (602) is disposed on the side of the second annular sidewall (2013) facing the main air channel (1). The first annular protrusion (608) is disposed on the outer peripheral side and / or inner peripheral side of the first annular connecting part (602). The first annular protrusion (608) abuts against the first annular sidewall (2011) and the second annular sidewall (2013), and the first annular sidewall (2011), the annular connecting wall (2012), the second annular sidewall (2013), and the first annular protrusion (608) form an isolation gap.

2. The fan according to claim 1, characterized in that, The second annular sidewall (2013) is parallel to the first annular sidewall (2011); And / or, along the radial direction of the annular air duct (2), the distance between the first annular outer wall (202) and the first annular side wall (2011) is D1, 23cm≤D1≤50cm; And / or, the distance between the first annular sidewall (2011) and the second annular sidewall (2013) is D2, 8cm≤D2≤13cm; And / or, the distance between the second annular sidewall (2013) and the axis of the central flow channel is D3, 90cm≤D3≤115cm.

3. The fan according to claim 1, characterized in that, Along the radial direction of the annular air duct (2), the distance between the first annular outer wall (202) and the first annular side wall (2011) is D1, the distance between the first annular side wall (2011) and the second annular side wall (2013) is D2, and the distance between the second annular side wall (2013) and the axis of the central flow channel is D3, 0.18 < D1 / (D2+D3) < 0.67; And / or, 0.06 < D2 / D3 < 0.14; And / or, 1.77 < D1 / D2 < 6.

25.

4. The fan according to claim 1, characterized in that, The second annular sidewall (2013) is provided with a plurality of first engaging portions (205) spaced apart in the circumferential direction. The first annular protrusion (608) or the first annular connecting portion (602) is provided with a second engaging portion (606) on the side facing the annular connecting wall (2012) that is engaged with the first engaging portions (205) one by one.

5. The fan according to claim 4, characterized in that, When the second engaging part (606) engages with the first engaging part (205), the second annular sidewall (2013) abuts against the first annular protrusion (608), and the inner surface of the second annular sidewall (2013) smoothly connects with the inner surface of the first annular connecting part (602).

6. The fan according to claim 1, characterized in that, The heating component (3) includes a heating element support (301), which has a plurality of seventh engagement parts (3011) spaced apart along its circumference. The air guide plate support (5) is located on the side of the air guide plate cover (6) facing the main air duct (1), and the air guide plate support (5) has an eighth engagement part (5023) that is engaged with the seventh engagement parts (3011) one by one.

7. The fan according to claim 6, characterized in that, The air guide plate bracket (5) includes a second central connecting part (501) and a second annular connecting part (502). The air guide plate (7) is rotatably disposed between the second central connecting part (501) and the second annular connecting part (502). The second annular connecting part (502) includes an annular rib (5021). The annular rib (5021) extends along the axial direction of the annular air duct (2) and is located on the outer periphery of the first annular connecting part (602). The eighth engaging portion (5023) is provided on the annular rib plate (5021), and / or, the annular rib plate (5021) abuts against the first annular protrusion (608), and / or, the outer periphery of the annular rib plate (5021) is provided with a connecting rib plate (5022) extending radially outward, and the connecting rib plate (5022) abuts against the end of the heating element support (301).

8. The fan according to claim 7, characterized in that, A heat-insulating gap is formed between the first annular connecting part (602) and the second annular connecting part (502).

9. The fan according to any one of claims 1 to 8, characterized in that, The main air duct (1) includes a cylindrical peripheral wall (101) and an end wall (102) located at the end of the cylindrical peripheral wall (101). The outer periphery of the end wall (102) is provided with a plurality of ninth engaging parts (103) spaced apart along the circumferential direction. The first annular outer wall (202) is provided with a tenth engaging part (206) that is engaged with the ninth engaging parts (103) one by one.

10. The fan according to claim 9, characterized in that, The cylindrical peripheral wall (101) is provided with a guide vane (104) at one end facing the annular air duct (2). A connecting plate (105) is provided at the center of the guide vane (104). The connecting plate (105) and the guide plate bracket (5) are positioned by a positioning structure and connected by fasteners.

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