fan

Abstract

The application provides a fan, which comprises a body, an air inlet, an air outlet, a fan for generating an air flow, a heating unit for heating the air flow by a rectangular heating medium, and an air duct connector, wherein a circular air inlet of the air duct connector is connected to an air outlet of the fan, a rectangular air outlet of the air duct connector is connected to an air inlet of the heating unit, and a gradually changing pipeline is formed from the circular air inlet to the rectangular air outlet inside the air duct connector; and at least one air emitting component is detachably connected to the air outlet of the body, and is used for receiving the air flow heated by the body and emitting the air flow. The application can detach the air emitting component and the body, replace different types of air emitting components, and adapt to different use scenarios by connecting air emitting components with different functions.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment, and more specifically, to fans. Background Technology

[0002] With the continuous improvement of living standards and technological levels, people's demands for quality of life are increasing, and indoor air quality has become an important concern. In particular, the emergence of smog and PM2.5 problems in recent years has led to a greater demand for air purifiers.

[0003] Air purifiers are small household appliances used to purify indoor air, primarily addressing indoor air pollution caused by renovations or other factors. Because the release of pollutants into indoor air is persistent and unpredictable, using air purifiers is an internationally recognized method for improving indoor air quality. Air purifiers utilize various technologies and media to provide users with clean and safe air. Commonly used air purification technologies include: low-temperature asymmetric plasma air purification technology, adsorption technology, negative ion technology, negative oxygen ion technology, molecular complexation technology, nano-TiO2 technology, HEPA high-efficiency filtration technology, electrostatic dust collection technology, and active oxygen technology. Material technologies mainly include: photocatalysts, activated carbon, synthetic fibers, and HEPA high-efficiency materials. High-quality filters can account for 20% to 30% of the total cost of an air purifier.

[0004] Currently, there are many bladeless fans with air filters that can be used for both cooling and heating. Figure 1 This is a cross-sectional view of a bladeless fan in the prior art. (Example:) Figure 1 As shown, most of them have annular nozzles 901, outer shell 903, base 904, filter screen 905, fan motor 906, and mesh inner liner 907. The outer shell 903, with its air inlet mesh, is mounted on the base 904. The filter screen 905 is located inside the outer shell 903, and the mesh inner liner 907 is located inside the filter screen 905. The first air inlet of the fan motor 906 is located in the mesh inner liner 907. The annular nozzles 901 are all positioned above the fan motor 906 in the direction of gravity. The air outlet of the fan motor 906 connects to the nozzles 901. A strip-shaped heating unit is located inside the nozzles 901. Indoor air passes sequentially through the mesh of the outer shell 903 and the filter screen 905 before entering the mesh inner liner 907. The air inlet of the fan motor 906 draws in air in the anti-gravity direction and continues to deliver it in the anti-gravity direction (vertically upward) to one end of the annular nozzle 901. The air is then dispersed throughout the annular nozzle 901 and ejected.

[0005] The existing technology has at least the following technical problems that need to be improved:

[0006] (1) Because bladeless fans have a large heating unit installed near the air outlet of the nozzle in order to achieve both cooling and heating, the heating unit, as a high-power electrical component, needs to be connected to the power supply module of the base via a power supply circuit. In this structure, the presence of the power supply circuit connecting the nozzle and the lower body makes the nozzle and the lower body inseparable, and the nozzle cannot be replaced, thus limiting the application scenarios of the bladeless fan.

[0007] (2) Because it cannot be disassembled, the machine is huge and the transportation and storage costs are high.

[0008] (3) Because the heating unit (containing many metal components) with a large mass is located in the nozzle, the center of gravity of the whole machine is shifted upward, making it easy to tip over.

[0009] (4) Moreover, since the heating unit is close to the air outlet, users may get burned if they accidentally put their hands into the air outlet, which poses a safety hazard.

[0010] (5) Since the nozzle changes the direction of airflow, the air volume in the middle of the nozzle is larger and the air volume at the bottom and top is smaller. This will result in the large air volume in the middle of the strip-shaped heating unit carrying away a large amount of heat and blowing out high-heat hot air (H); conversely, the air volume at the top and bottom ends is small and only low-heat hot air (L) is blown out. Due to the uneven air temperature, the local heat accumulation at both ends of the strip-shaped heating unit also reduces the service life of the heating unit.

[0011] Therefore, the present invention provides a fan. Summary of the Invention

[0012] To address the problems in the prior art, the present invention aims to provide a fan that overcomes the limitations of the prior art by allowing the separation of the air emitter and the body, enabling the replacement of different types of air emitters, and making it suitable for different usage scenarios by connecting air emitters with different functions.

[0013] An embodiment of the present invention provides a fan, comprising:

[0014] The body includes an air inlet, an air outlet, a fan for generating airflow, a heating unit for heating the airflow with a rectangular heating medium, and an air duct connector. The circular air inlet of the air duct connector connects to the air outlet of the fan, and the rectangular air outlet of the air duct connector connects to the air inlet of the heating unit. A gradient conduit is formed inside the air duct connector, from the circular air inlet to the rectangular air outlet.

[0015] At least one air emitter is detachably connected to the air outlet of the body for receiving and emitting the air stream heated by the body.

[0016] Preferably, the first cross-sectional area of ​​the air outlet of the fan is smaller than the area of ​​the second cross-section of the heating unit.

[0017] Preferably, the heating unit is provided with a PTC heating element with a horizontal cross-section of a square, and the side length of the square is greater than or equal to the diameter of the circular air outlet of the fan.

[0018] Preferably, the first projection pattern of the first cross-section of the air outlet of the fan in the horizontal plane is included in the second projection pattern of the second cross-section of the heating unit in the horizontal plane.

[0019] Preferably, the air inlet end of the air passage connector is provided with an arc-shaped flow slope that forms a gradually changing circular tube, and the air outlet end of the air passage connector is provided with a vertical flow slope that forms a square tube, and the cross-section of the air passage gradually changes from a circle to a square before converging into the square tube during the process of the airflow passing through the gradually changing circular tube.

[0020] Preferably, the air outlet of the fan is annular, and the air outlet is provided with a converging air ring and several guide vanes. The guide vanes are radially distributed at the air outlet along the rotation axis of the motor in the fan, and the guide vanes divide the annular air outlet into multiple segments of annularly arranged air outlets.

[0021] Preferably, the airflow passes through a first-stage air passage defined by at least the converging fan ring and the guide vane, and then through a second-stage air passage defined by at least the guide vane and the gradient circular tube before reaching the square tube.

[0022] Preferably, the heating unit is located downstream of the fan, and the heating unit is connected to the power module through a heating power supply circuit located only within the body. The airflow passes through the heating unit along the anti-gravity direction and is then emitted to the air emitter.

[0023] Preferably, the lower end of the air emitter is provided with a plurality of L-shaped claws, and the air outlet located on the upper surface of the body is provided with an L-shaped groove, wherein the air emitter is rotatably engaged with the air outlet of the body.

[0024] Preferably, the body further includes a filter located downstream of the air inlet and upstream of the fan;

[0025] The air inlet is located on the bottom surface of the body. Air is drawn in along the anti-gravity direction to a first air collection chamber. The air entering from the air inlet passes through the filter along the anti-gravity direction and reaches a second air collection chamber, and is then drawn into the fan.

[0026] Preferably, the air emitter may also be at least one of the following: a porous pipe for warming blankets, a plug for drying shoes, a spray gun for drying hair, and a drying box for drying pet hair.

[0027] The fan of the present invention can be separated into an air emitter and a body, allowing for the replacement of different types of air emitters. It can be adapted to different usage scenarios by connecting air emitters with different functions. Attached Figure Description

[0028] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0029] Figure 1 This is a cross-sectional view of a bladeless fan in the prior art.

[0030] Figure 2 This is a cross-sectional view of the fan of the present invention.

[0031] Figure 3 This is a perspective view of the fan of the present invention.

[0032] Figure 4 yes Figure 3 Sectional view along the AA direction.

[0033] Figure 5 This is an exploded view of the fan of the present invention.

[0034] Figure 6 yes Figure 5 Sectional view along the BB direction.

[0035] Figure 7 This is a schematic diagram of the connection structure between the fan and the heating unit of the present invention.

[0036] Figure 8 yes Figure 7 A cross-sectional view along the CC direction.

[0037] Figure 9 This is an exploded view of the connection structure between the fan and the heating unit of the present invention.

[0038] Figure 10 This is a perspective view of the airway connector of the present invention.

[0039] Figure 11 This is a cross-sectional view of the airway connector of the present invention.

[0040] Figure 12 This is a cross-sectional view of the fan of the present invention.

[0041] Figure 13 This is a top view of the fan of the present invention.

[0042] Figure 14 This is a schematic diagram of the heating unit of the present invention.

[0043] Figure 15 yes Figure 14 A sectional view along the DD direction.

[0044] Figure 16 yes Figure 14 A cross-sectional view along the EE direction.

[0045] Figure 17 This is an exploded view of the heating unit of the present invention.

[0046] Figure Labels

[0047] 1. Air-launching component

[0048] 17 L-shaped chucks

[0049] 18 clasps

[0050] 2. Body

[0051] 20 Sealed housing

[0052] 21 checkpoints

[0053] 22 L-shaped slots

[0054] 23 First air chamber

[0055] 24 Second episode air chamber

[0056] 27. Circular air intake grille

[0057] 28 Air Inlet

[0058] 29 Air outlet

[0059] 3 heating units

[0060] 31 Lower shell

[0061] 32 Upper shell

[0062] 33 Insulating seals

[0063] 34 PTC heating element

[0064] 35 Lead wire

[0065] 36 Protective shield

[0066] 37 Drainage Grille

[0067] 38 Slits

[0068] 4. Airway connecting parts

[0069] 41. Circular arc drainage slope

[0070] 42 Second diversion slope

[0071] 5. Fans

[0072] 51 motor

[0073] 52. Condensing the airflow.

[0074] 53 Drainage Pieces

[0075] 54 Air Inlet

[0076] 55 air outlet

[0077] 56 ventilation holes

[0078] 57 Circuit Board

[0079] 58 Fan casing

[0080] 6 Filters

[0081] 7. Base Detailed Implementation

[0082] The following specific examples illustrate the implementation methods of this application. Those skilled in the art can easily understand the other advantages and effects of this application from the content disclosed herein. This application can also be implemented or applied through other different specific embodiments, and various details in this application can be modified or changed according to different viewpoints and application systems without departing from the spirit of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0083] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the application. This application may be embodied in many different forms and is not limited to the embodiments described herein.

[0084] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0085] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0086] For the purpose of clearly describing this application, devices that are not relevant to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0087] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0088] When we say that a device is "above" another device, this can mean that it is directly above the other device, or it can mean that other devices are present in between. Conversely, when we say that a device is "directly" "above" another device, there are no other devices present in between.

[0089] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0090] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this application. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in the specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0091] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the content of this present application, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0092] Figure 2 This is a cross-sectional view of the fan of the present invention. Figure 3 This is a perspective view of the fan of the present invention. Figure 4 yes Figure 3 Sectional view along the AA direction. Figure 5 This is an exploded view of the fan of the present invention. Figure 6 yes Figure 5 A sectional view along the BB direction. (e.g.) Figures 2 to 6 As shown, the fan of the present invention includes: a body 2 and at least one air emitter 1. The body 2 includes an air inlet 28, an air outlet 29, a fan 5 for generating airflow, and a heating unit 3 for heating the airflow. The air emitter 1 is detachably connected to the air outlet 29 of the body 2, and is used to receive the airflow heated by the body 2 and emit the airflow. The fan nozzle and lower body of the present invention are detachable, allowing for nozzle replacement and expanding the application scenarios of bladeless fans. Furthermore, since the heating unit is located in the lower part of the body 2, the internal space of the body 2 can be fully utilized to install a plate heating element with a larger effective heating area (the heating effect of the plate heating element is significantly higher than that of the strip heating element in the prior art), enhancing the energy conversion rate, and lowering the center of gravity of the entire unit, making it less prone to tipping over. The heating unit is further away from the air outlet, reducing safety hazards. Furthermore, the heating unit 3 in this invention can be a plate-shaped PTC heating element, and the airflow evenly carries away all the heat through the positive PTC heating element, ensuring the heat transfer effect and extending the service life of the heating unit.

[0093] The heating unit 3 in this invention is equipped with a PTC (Positive Temperature Coefficient) heating element, which is composed of a PTC ceramic heating element and an aluminum tube. This type of PTC heating element has the advantages of low thermal resistance and high heat exchange efficiency, making it an automatic temperature-controlled and energy-saving electric heater. The PTC heating element product uses U-shaped corrugated heat sinks, which improves its heat dissipation rate and combines the advantages of adhesive and mechanical bonding. It also fully considers various thermal and electrical phenomena of the PTC heating element during operation, resulting in strong bonding, excellent thermal conductivity and heat dissipation performance, high efficiency, and safety and reliability. This type of PTC heater has the advantages of low thermal resistance and high heat exchange efficiency, making it an automatic temperature-controlled and energy-saving electric heater. A key feature is its safety performance: when the fan fails and stops, the PTC heater will automatically and rapidly reduce its power due to insufficient heat dissipation. At this time, the surface temperature of the heater will be maintained at around the Curie temperature (generally around 250℃), thus preventing the surface "reddening" phenomenon seen in electric heating tube heaters. The PTC heating element consists of a galvanized outer pressure plate, a stainless steel corrugated spring sheet, a galvanized inner pressure plate, a single-layer aluminum heat sink, a PTC heating element, a double-layer aluminum heat sink, nickel-plated copper electrode terminals, and a PPS high-temperature plastic electrode sheath.

[0094] In a preferred embodiment, the heating unit 3 is located downstream of the fan 5, and the heating unit 3 is connected to the power module via a heating power supply circuit located only within the body 2. Under the structure of this invention, it is no longer necessary to provide power supply lines for the air emitter 1 and the body 2. The air emitter 1 may not have any wiring, and the entire circuitry of the fan is located only within the body 2. The body 2 also no longer needs to supply power to the air emitter 1, greatly simplifying the overall circuitry, but this is not a limitation.

[0095] In a preferred embodiment, the airflow passes through the heating unit 3 along the anti-gravity direction (X direction) and is then emitted to the air emitter 1. At least one air emitter 1 is a nozzle, which receives the airflow heated by the body 2 and guides the airflow to be emitted horizontally, but is not limited thereto.

[0096] In one variation, the nozzle includes a foldable pipe (not shown) that can extend and retract along the direction of gravity. Since there is no heating power source or power supply circuit inside the nozzle, the nozzle can have a foldable mechanical structure, such as a sliding structure between the inner and outer tubes, so that the fan can fold and compress the nozzle when not in use to further reduce its volume, but this is not a limitation.

[0097] In a preferred embodiment, the lower end of the air emitter 1 is provided with a retaining ring 18 and a plurality of L-shaped claws 17. The air outlet 29 located on the upper surface of the body 2 is provided with a locking opening 21 and an L-shaped groove 22. After the retaining ring 18 and the locking opening 21 are aligned vertically, the L-shaped claws 17 rotate horizontally along the L-shaped groove 22 to engage, so that the air emitter 1 and the air outlet 29 of the body 2 are engaged as one unit, thereby realizing the mechanical connection between the air emitter 1 and the body 2.

[0098] In a preferred embodiment, the nozzle is configured as a double-layered sleeve structure with the outer cavity surrounding the inner cavity. This confines the heat inside the nozzle to the inner cavity, ensuring the user only comes into contact with the outer cavity, which serves as the outer shell of the air emitter 1. Furthermore, the heat insulation structure between the outer and inner cavities prevents heat transfer outwards, optimizing the direction of heat transfer and enhancing safety during use. Additionally, the L-shaped claw 17 is integrally formed at the bottom of the inner cavity, and the retaining ring 18 is integrally formed at the bottom of the outer cavity.

[0099] In a preferred embodiment, the body 2 further includes a filter 6 located downstream of the air inlet 28 and upstream of the fan 5. Air entering from the air inlet 28 passes through the filter 6 along the anti-gravity direction (X direction) and then enters the fan 5. An annular air intake grille 27 for dust prevention is provided at the air inlet 28, but this is not a limitation.

[0100] In a preferred embodiment, the air inlet 28 is located on the bottom surface of the body 2, and air is drawn in along the anti-gravity direction (X direction) to a first air collection chamber 23. The air in the first air collection chamber 23 passes through the filter 6 and is drawn into the fan 5 after reaching a second air collection chamber 24. The second air collection chamber 24 is stacked on top of the first air collection chamber 23, so that the air inlet 28 is as far away from the nozzle as possible, avoiding the air inlet 28 from drawing in heated airflow and ensuring the air supply effect, but it is not limited to this.

[0101] In a preferred embodiment, the body 2 further includes a sealed outer shell 20 that circumferentially seals around the fan 5 and the heating unit 3, but is not limited thereto.

[0102] In a preferred embodiment, a base 7 is also included, and the body 2 is rotatably connected to the base 7, but this is not a limitation.

[0103] In a preferred embodiment, the air emitter may also be at least one of the following: a porous conduit for warming blankets, a plug for drying shoes, a spray gun for drying hair, and a drying box for drying pet fur, but is not limited thereto.

[0104] refer to Figure 5 and 6As shown, the method of using the fan of the present invention, employing the above-described fan, includes the following process: detaching the air emitter 1 currently connected to the air outlet 29 of the body 2 (see...). Figure 5 , 6 Then, another air emitter (not shown in the figure) is connected to the air outlet 29 of the body 2. The other air emitter can be one of the following: a porous pipe for warming blankets, a stick for drying shoes, a spray gun for drying hair, or a drying box for drying pet hair. When the new air emitter is connected to the body 2, the air flow heated by the body 2 enters the new air emitter and emits air flow according to the functional structure of the new air emitter, realizing the switching of the fan in different usage scenarios (changing to warming blankets or drying hair, etc.).

[0105] Figure 7 This is a schematic diagram of the connection structure between the fan and the heating unit of the present invention. Figure 8 yes Figure 7 A cross-sectional view along the CC direction. Figure 9 This is an exploded view of the connection structure between the fan and the heating unit of the present invention. Figure 10 This is a perspective view of the airway connector of the present invention. Figure 11 This is a cross-sectional view of the airway connector of the present invention. Figures 7 to 11 As shown, the air outlet of the fan 5 in this invention is circular, while the heating unit 3 has a rectangular heating medium to heat the airflow. To match the different cross-sectional shapes of the two, an air duct needs to be connected to the fan 5 and the heating unit 3 via an air duct connector 4. The circular air inlet of the air duct connector 4 connects to the air outlet of the fan 5, and the rectangular air outlet of the air duct connector 4 connects to the air inlet of the heating unit 3. The air duct connector 4 internally forms a gradually changing pipe from the circular air inlet to the rectangular air outlet. The air inlet end of the air duct connector 4 has four sections forming a circular arc drainage slope 41 that together constitutes the gradually changing circular pipe, and the air outlet end of the air duct connector 4 has four sections forming a vertical drainage slope 42 that together constitutes a square pipe. As the airflow passes through the gradually changing circular pipe, the cross-section of the air duct gradually changes from circular to square before converging into the square pipe. This ensures both the use of a square PTC heating element 34 with lower cost and better heating effect, and also utilizes the air duct connector 4 to shape the air duct. In this invention, the airflow direction passing through the fan 5 is the same as the airflow direction passing through the heating unit 3 (both rise along the same anti-gravity direction), which helps to further reduce wind noise.

[0106] In a preferred embodiment, the first cross-sectional area of ​​the air outlet of the fan 5 is smaller than the area of ​​the second cross-section of the heating unit 3, such that the first projection pattern of the first cross-section of the air outlet of the fan 5 on the horizontal plane is included in the second projection pattern of the second cross-section of the heating unit 3 on the horizontal plane, so as to obtain a larger effective heating area, but not limited thereto.

[0107] Figure 12 This is a cross-sectional view of the fan of the present invention. Figure 13 This is a top view of the fan of the present invention. (As shown) Figure 8 , 12 As shown in Figure 13, the air outlet of the fan 5 is annular, and the air outlet is provided with a converging air ring 52, several guide vanes 53, and several heat dissipation holes 56. The guide vanes 53 are radially distributed at the air outlet along the rotation axis of the fan 5. One end of the guide vane 53 divides the annular air outlet into multiple segments arranged in a ring, and the other end extends beyond the converging air ring 52 to the heat dissipation hole 56 located in the middle of the air outlet. The airflow passes through the first stage air passage defined by at least the converging air ring 52 and the guide vanes 53, and then through the second stage air passage defined by at least the partial guide vanes 53 extending beyond the converging air ring 52. The airflow is guided by the guide vanes 53, first carrying away the heat from the fan 5 through the heat dissipation holes 56, and then entering the heating unit 3.

[0108] In a preferred embodiment, the fan 5 further includes a cylindrical fan housing 58 and a circuit board 57. The fan 5 is disposed inside the fan housing 58, and the air duct connector 4 is connected to the fan housing 58, enclosing the fan 5 in the space formed by the air duct connector 4 and the fan housing 58. The circuit board 57 is disposed on the outer wall of the fan housing 58 and is electrically connected to the motor 51 in the fan 5.

[0109] In a preferred embodiment, the airflow sequentially passes through a first-stage airflow duct defined at least by the converging fan 52 and the guide vane 53, and then through a second-stage airflow duct defined at least by the guide vane 53 and the tapered circular tube before reaching the square tube. The second-stage airflow duct further reduces the airflow cross-section compared to the first-stage airflow duct, thereby further pressurizing the airflow while deforming the airflow duct. The combination of the converging fan 52, the guide vane 53, the tapered circular tube of the airflow duct connector 4, and the square tube of the airflow duct connector 4 effectively confines the airflow leaving the fan 5, continuously pressurizing the airflow along this airflow duct.

[0110] Figure 14 This is a schematic diagram of the heating unit of the present invention. Figure 15 yes Figure 14 A sectional view along the DD direction. Figure 16 yes Figure 14 A cross-sectional view along the EE direction. Figure 17 This is an exploded view of the heating unit of the present invention. Figures 14 to 17As shown, the heating unit 3 in the fan of the present invention is located downstream of the fan 5. The heating unit 3 includes a lower housing 31 with a square through hole, an upper housing 32 with a circular through hole, a plurality of lead wires 35, a protective cover 36, a drainage grille 37, an insulating seal 33, and a square PTC heating element 34 disposed between the lower housing 31 and the upper housing 32. The upper housing 32 has a gradually changing air passage with a square lower end and a circular upper end. The plurality of lead wires 35 are integrally formed on one side of the PTC heating element 34. The insulating seal 33 is encapsulated at the junction of the lower housing 31 and the upper housing 32. The insulating seal 33 has a through hole, and the lead wires 35 extend from the through hole to the outside of the lower housing 31 and the upper housing 32. The extension direction of the lead wires 35 is parallel to the horizontal plane. A flow-guiding grille 37 is formed at the circular upper opening of the upper housing 32. The slit 38 formed between adjacent flow-guiding grilles 37 has a trapezoidal cross-section that is wider at the bottom and narrower at the top, and the slit 38 guides the airflow in the direction of anti-gravity. A protective cover 36 covers the upper surface of the flow-guiding grille 37. The heating unit 3 is equipped with a PTC heating element 34 with a horizontal cross-section of a square, the side length of which is greater than or equal to the diameter of the circular air outlet of the fan 5.

[0111] In the fan body 2 of this invention, the airflow duct undergoes multiple deformations, especially from the circular air outlet of the fan 5 to the airflow connector 4. After passing through a gradually changing pipe inside the airflow connector 4, the airflow is transformed into a square shape before entering the heating unit 3. This, combined with the square PTC heating element 34 used in the heating unit 3, significantly improves the heating effect and helps reduce costs. The heated airflow then passes through the upper housing 32 of the heating unit 3, transforming into a circular air outlet, and is discharged from the air outlet 29 to the air emitter 1 for emission.

[0112] In summary, the purpose of this invention is to provide a fan that can separate the air emitter and the body, enabling the replacement of different types of air emitters, and can be adapted to different usage scenarios by connecting air emitters with different functions.

[0113] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A fan, characterized in that, include: The body (2) includes an air inlet (28), an air outlet (29), a fan (5) for generating airflow, a heating unit (3) for heating the airflow with a rectangular heating medium, and an air passage connector (4). The circular air inlet of the air passage connector (4) is connected to the air outlet of the fan (5), and the rectangular air outlet of the air passage connector (4) is connected to the air inlet of the heating unit (3). The air passage connector (4) forms a gradual pipe from the circular air inlet to the rectangular air outlet. The air inlet end of the air passage connector (4) is provided with a circular flow slope (41) that forms a gradual circular pipe. The air outlet end of the air passage connector (4) is provided with a vertical flow slope (42) that forms a square pipe. During the process of the airflow passing through the gradual circular pipe, the cross-section of the air passage gradually changes from a circle to a square and then converges into the square pipe. The heating unit (3) is located downstream of the air passage connector (4). as well as At least one air emitter (1) is detachably connected to the air outlet (29) of the body (2) for receiving the air flow heated by the body (2) and emitting the air flow. The heating unit (3) is connected to the power supply module through a heating power supply circuit provided only in the body (2). The heating unit (3) includes a lower housing (31) with a square through hole, an upper housing (32) with a circular through hole, and a PTC heating element (34) with a square horizontal cross section disposed between the lower housing (31) and the upper housing (32). The upper housing (32) forms a gradient air passage with a square bottom and a circular top inside. The air flow passes through the heating unit (3) along the anti-gravity direction and is emitted to the air emitter (1).

2. The fan as described in claim 1, characterized in that, The first cross-sectional area of ​​the air outlet of the fan (5) is smaller than the area of ​​the second cross-section of the heating unit (3).

3. The fan as described in claim 2, characterized in that, The side length of the square is greater than or equal to the diameter of the circular air outlet of the fan (5).

4. The fan as described in claim 1, characterized in that, The first projection pattern of the first cross-section of the air outlet of the fan (5) on the horizontal plane is included in the second projection pattern of the second cross-section of the heating unit (3) on the horizontal plane.

5. The fan as described in claim 1, characterized in that, The air outlet of the fan (5) is annular. The air outlet is provided with a wind-gathering ring (52) and several guide vanes (53). The guide vanes (53) are radially distributed at the air outlet along the rotation axis of the motor (51) in the fan (5). The guide vanes (53) divide the annular air outlet into multiple segments of annularly arranged air outlets.

6. The fan as described in claim 5, characterized in that, The airflow passes through a first-stage air passage defined by at least the converging air ring (52) and the guide plate (53), and then through a second-stage air passage defined by at least the guide plate (53) and the gradient circular tube before reaching the square tube.

7. The fan as claimed in claim 1, characterized in that, The lower end of the air emitter (1) is provided with several L-shaped claws (17), and the air outlet (29) located on the upper surface of the body (2) is provided with an L-shaped slot (22). The air emitter (1) and the air outlet (29) of the body (2) are rotated and engaged.

8. The fan as claimed in claim 1, characterized in that, The body (2) also includes a filter (6) located downstream of the air inlet (28) and upstream of the fan (5); The air inlet (28) is located on the bottom surface of the body (2). Air is drawn in along the anti-gravity direction to a first air collection chamber (23). The air entering from the air inlet (28) passes through the filter (6) along the anti-gravity direction and reaches a second air collection chamber (24), and is then drawn into the fan (5).

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