Bladeless fan capable of switching cold air and hot air

Abstract

The invention relates to a bladeless fan capable of switching cold air and hot air, the core of the bladeless fan is an air valve assembly in a shunt pipe, and an air inlet connecting port can be communicated with a first air outlet (in a first air outlet form) or a second air outlet (in a second air outlet form) by switching an air valve; in the first form, airflow enters the hot air outlet shell with the electric heater through the first air outlet, warm air is formed, and the heating requirements in winter, spring and autumn are met; in the second form, the airflow enters the cold air outlet pipe through the second air outlet, cold air is sent out, and cooling in summer is adapted; the first air outlet on the front side of the shunting pipe corresponds to warm air (front concentrated air supply), the left and right second air outlets correspond to cold air (two-side diffused air supply), and air supply modes can be flexibly switched. And the air duct elbow rotationally communicates with the flow dividing pipe, the cold air outlet pipe can rotate, a user can adjust the air supply angle, the problem that air outlet of a traditional bladeless fan is fixed is solved, the air supply requirement of a specific area is accurately met, and the equipment utilization rate and practicability are improved.

Description

Technical Field

[0001] This invention relates to the field of bladeless fan technology, and in particular to a bladeless fan capable of switching between hot and cold air. Background Technology

[0002] In modern home and office environments, bladeless fans, with their advantages of no exposed blades, gentle airflow, high safety, and easy cleaning, have gradually become an important replacement for traditional bladed fans and are widely used in summer cooling scenarios. However, current bladeless fan products on the market generally suffer from problems such as limited functionality and restricted usage scenarios, making it difficult to meet users' needs for use in all seasons and with diverse requirements. Specific shortcomings are reflected in the following aspects: 1. Most existing bladeless fans only have a cooling function, providing cooling only in summer. In spring and autumn when indoor temperatures are slightly cool, or in winter when it is cold, they cannot provide heating support, resulting in long-term idleness during non-summer periods, low equipment utilization, and increased purchase costs for users; 2. Traditional bladeless fans mostly have fixed air outlets, and the airflow direction can only be adjusted by changing the angle of the fan base, making it impossible to precisely target airflow to specific areas; at the same time, the airflow pattern is limited, making it difficult to meet the needs of different scenarios. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the problems existing in the prior art. To this end, the present invention proposes a bladeless fan that can switch between hot and cold air.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A bladeless fan capable of switching between hot and cold air includes a fan base, a fan motor assembly housed within the fan base, and an airflow outlet located at the upper end of the fan base. A straight duct is installed on the airflow outlet, and a duct bend is connected to the upper end of the straight duct. A splitter pipe is rotatably connected to the front end of the duct bend. The splitter pipe has an air inlet connection at its rear side, a first air outlet at its front side, and second air outlets at both its left and right ends. The air inlet connection is connected to the duct bend. The first air outlet is located in front of... A hot air outlet housing is provided at one end, and an electric heater is provided inside the hot air outlet housing. A cold air outlet pipe is rotatably installed on each of the two second air outlets, and a cold air outlet is provided at the front end of each of the two cold air outlet pipes. An air valve assembly is also provided in the diversion pipe. The air valve assembly is used to switch between a first air outlet mode and a second air outlet mode. In the first air outlet mode, the air inlet is connected to the first air outlet, and in the second air outlet mode, the air inlet is connected to both second air outlets.

[0005] In some embodiments, a plurality of grille plates are provided at intervals along the left and right direction at the air outlet of the hot air outlet housing. The grille plates are hinged to the hot air outlet housing so that the air outlet angle can be adjusted by swinging. A first adjustment component that can drive the grille plates to swing is also provided on the hot air outlet housing.

[0006] In some embodiments, the first adjustment component includes a first sliding plate and a second sliding plate that slide left and right on the hot air outlet housing. A column is provided at the upper end of each of the grille plates. A connecting strip is connected to the upper end of the column. Guide posts are spaced left and right at the upper end of the connecting strip. Guide adjustment grooves are spaced left and right on the first sliding plate. Two guide posts are correspondingly provided in the guide adjustment grooves. A first rack is also provided on the first sliding plate. A second rack is provided on the second sliding plate. A transmission gear meshes between the first rack and the second rack. An adjustment lever is also provided at the upper end of the second sliding plate.

[0007] In some embodiments, the air valve assembly includes two diversion cylinders that slide left and right within the diversion pipe. The diversion cylinders slide within the second air outlet. The outer end of each diversion cylinder is an open air outlet, and the inner end has an arc-shaped air guiding structure. An air inlet is provided on the rear side of the inner end. In the first air outlet mode, the two diversion cylinders move outward relative to each other, sealing the connection between the air inlet and the second air outlet through the inner ends of the diversion cylinders. In the second air outlet mode, the two diversion cylinders move inward relative to each other, sealing the connection between the air inlet and the first air outlet through the inner ends of the two diversion cylinders. The air inlet is connected to the air inlet.

[0008] In some embodiments, a second adjustment component is further provided on the diversion tube, the second adjustment component being used to drive the two diversion cylinders to move outward synchronously, or to move inward synchronously.

[0009] In some embodiments, the second adjusting component includes guide grooves spaced apart on the diverter tube, sliding columns that slide within the guide grooves are provided at the upper ends of both diverter cylinders, a transmission arm is hinged to the upper end of each sliding column, a knob is rotatably mounted at the upper end of the diverter tube and between the two guide grooves, the other end of the transmission arm is hinged to the knob, and a torsion spring is connected between the diverter tube and the sliding column.

[0010] In some embodiments, a sensor is also provided on the diversion tube, and a flange that cooperates with the sensor is provided on the knob. When the knob drives the two diversion cylinders to move outward synchronously, the flange triggers the sensor. A terminal block that is electrically connected to the sensor and the electric heater is provided on the diversion tube, and a main control board that is electrically connected to the terminal block is also provided in the fan base.

[0011] In some embodiments, the straight duct is detachably connected to the fan base. A connecting groove is provided at the upper end of the fan base, the airflow outlet is located on the connecting groove, a connecting end cap is provided at the lower end of the straight duct, and a mounting ring is provided at the lower end of the connecting end cap. The mounting ring is detachably installed in the connecting groove by a rotation snap-fit ​​structure. A first electrical connector electrically connected to the terminal block is provided on the connecting end cap, and a second electrical connector electrically connected to the main control board is also provided at the upper end of the fan base. When the mounting ring is installed in the connecting groove, the first electrical connector and the second electrical connector are electrically connected to each other.

[0012] In some embodiments, the rotating snap-fit ​​structure includes a snap-fit ​​flange provided on the outer side wall of the mounting ring, and a snap-fit ​​groove corresponding to the snap-fit ​​flange is provided on the inner side wall of the connecting groove. The snap-fit ​​groove includes a vertical groove and a horizontal groove communicating with one side of the lower end of the vertical groove. The snap-fit ​​flange rotates and snaps into the horizontal groove after passing through the vertical groove.

[0013] In some embodiments, an arc-shaped groove is provided at the upper end of the fan base, and a sliding seat slides in the arc-shaped groove. The second electrical connector includes a female plug disposed on the sliding seat, and the first electrical connector is a male plug that mates with the female plug.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. By installing a damper assembly inside the distribution pipe, the connection between the air inlet and the first air outlet (first air outlet mode) or the connection between the air inlet and the second air outlet (second air outlet mode) can be achieved simply by switching the damper assembly. In the first air outlet mode, the airflow enters the hot air outlet housing through the first air outlet and is heated by the electric heater to form warm air, which can meet the needs of winter heating and indoor temperature rise in spring and autumn. In the second air outlet mode, the airflow enters the cold air outlet pipe through the second air outlet and is directly delivered as cold air, which meets the cooling needs in summer. This design can achieve rapid switching between hot and cold air functions without complex structural adjustments, enabling the product to cover different usage scenarios throughout the year and greatly improving the utilization rate and practicality of the equipment.

[0015] 2. The splitter pipe has a first air outlet at the front (for warm air) and second air outlets at both ends (for cold air). Warm air can be concentrated and directed forward, while cold air can be diffused to the left and right sides, achieving flexible switching between concentrated and diffused air delivery to meet the air delivery needs of different scenarios. The front end of the duct bend is rotatably connected to the splitter pipe, and a cold air outlet pipe is rotatably installed on the second air outlet. Users can adjust the air delivery angle by rotating the splitter pipe and the cold air outlet pipe. Compared with the fixed air delivery direction of traditional bladeless fans, the air delivery flexibility is significantly improved, which can accurately meet the user's air delivery needs for specific areas.

[0016] 3. In addition, the air valve assembly is integrated inside the distribution pipe, eliminating the need for a separate hot and cold air duct switching module. This simplifies the overall structural design, and the switching between hot and cold air relies solely on the single action of the air valve assembly. The steps are simple and easy to understand, allowing both the elderly and children to operate it easily, greatly improving the user experience. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the bladeless fan of the present invention.

[0018] Figure 2 This is a cross-sectional structural diagram of the first air outlet configuration of the present invention.

[0019] Figure 3 This is a cross-sectional view of the second air outlet configuration of the present invention.

[0020] Figure 4 This is one of the three-dimensional schematic diagrams of the diversion tube of the present invention.

[0021] Figure 5 This is the second three-dimensional schematic diagram of the diversion tube of the present invention.

[0022] Figure 6 For the present invention Figure 4 Enlarged diagram of point A.

[0023] Figure 7 For the present invention Figure 5 Enlarged diagram of point B.

[0024] Figure 8 This is a schematic diagram of the structure of the grating plate after installation according to the present invention.

[0025] Figure 9 This is a schematic diagram of the structure of the fan base and the straight air duct of the present invention.

[0026] Figure 10 This is a schematic diagram of the fan base of the present invention.

[0027] Figure 11 This is a schematic diagram of the structure of the connecting end cap of the present invention.

[0028] Figure 12 This is a partial cross-sectional view of the fan base of the present invention. Detailed Implementation

[0029] The following detailed description provides various embodiments or examples for carrying out the present invention. Of course, these are merely embodiments or examples and are not intended to be limiting. Additionally, repeated reference numerals, such as repeated numbers and / or letters, may be used in different embodiments. These repetitions are for the purpose of simple and clear description of the invention and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0030] like Figures 1-12 The bladeless fan shown includes a fan base 5, a fan motor assembly disposed within the fan base 5, and an airflow outlet 6 located at the upper end of the fan base 5. A straight air duct 7 is installed on the airflow outlet 6, and an air duct bend 8 is connected to the upper end of the straight air duct 7. A splitter pipe 1 is rotatably connected to the front end of the air duct bend 8. The splitter pipe 1 has an air inlet 2 at its rear side, a first air outlet 3 at its front side, and second air outlets 4 at both its left and right ends. The air inlet 2 is connected to the air duct bend 8. A hot air outlet housing 21 is provided at the front end, and an electric heater 22 is provided inside the hot air outlet housing 21. A cold air outlet pipe 10 is rotatably installed on each of the two second air outlets 4. A cold air outlet 11 is provided at the front end of each of the two cold air outlet pipes 10. An air valve assembly is also provided in the diversion pipe 1. The air valve assembly is used to switch between a first air outlet mode and a second air outlet mode. In the first air outlet mode, the air inlet connection port 2 is connected to the first air outlet 3, and in the second air outlet mode, the air inlet connection port 2 is connected to both second air outlets 4.

[0031] After the fan motor assembly inside the fan base 5 is started, it will draw in air from the outside and form a high-pressure airflow. The high-pressure airflow is transported along the internal air duct of the fan base 5 to the airflow outlet 6 at the top, providing a basic airflow source for subsequent hot and cold air output.

[0032] When the air valve assembly switches to the second air outlet mode, it blocks the passage between the air inlet connection 2 and the first air outlet 3 in the diversion pipe 1, while simultaneously opening the passage between the air inlet connection 2 and the second air outlets 4 on both sides. The high-pressure airflow output from the air outlet 6 first enters the straight duct 7, is then transported upwards through the straight duct 7 to the duct bend 8, and then enters the diversion pipe 1 through the air inlet connection 2 connected to the duct bend 8. The airflow entering the diversion pipe 1 flows along the opened passage to the two second air outlets 4 on the left and right, and then enters the cold air outlet pipe 10, which is rotatably installed on the second air outlet 4, and finally is directly discharged from the cold air outlet 11 at the front end of the cold air outlet pipe 10, forming cold air. During this process, the user can flexibly adjust the airflow angle of the cold air by rotating the cold air outlet pipe 10 to meet the cooling needs in different directions.

[0033] When the air valve assembly switches to the first air outlet mode, it blocks the passage between the air inlet 2 and the second air outlet 4 in the split pipe 1, while opening the passage between the air inlet 2 and the first air outlet 3 on the front side. The high-pressure airflow output from the air outlet 6 also enters the split pipe 1 through the straight pipe 7, the bend pipe 8, and the air inlet 2, and then flows to the first air outlet 3 along the opened passage. The airflow enters the front hot air outlet housing 21 through the first air outlet 3. At this time, the electric heater 22 in the hot air outlet housing 21 is activated and generates heat. The airflow is heated when it passes through the electric heater 22, forming warm air, which is then discharged from the opening of the hot air outlet housing 21.

[0034] Thus, the hot and cold air modes can be quickly switched through the air valve assembly in the split pipe 1 without complicated operation or disassembly and adjustment: the cold air mode is suitable for summer cooling, and the warm air mode meets the needs of winter heating and indoor heating in spring and autumn. It breaks the limitation of traditional bladeless fans that can only be used in summer, and achieves functional coverage of multiple seasons and scenarios throughout the year, greatly improving the practicality and utilization of the product.

[0035] See Figure 5 , Figure 7 , Figure 8 As shown, a plurality of grille plates 31 are arranged at intervals along the left and right direction at the air outlet of the hot air outlet housing 21. The grille plates 31 are hinged to the hot air outlet housing 21, so that the air outlet angle can be adjusted by swinging. A first adjustment component that can drive the grille plates 31 to swing is also provided on the hot air outlet housing 21.

[0036] According to actual air supply needs, users can adjust the swing angle of the grille plate 31 by operating the first adjustment component, and adjust the air outlet direction and diffusion range of the warm air by changing the angle between the grille plate 31 and the air outlet of the hot air outlet housing 21.

[0037] The first adjustment component, as the power source for the grille 31, can drive all the grille 31 to swing synchronously through manual operation or electric drive.

[0038] Furthermore, the first adjustment component includes a first sliding plate 41 and a second sliding plate 42 that slide left and right on the hot air outlet housing 21. A column 43 is provided at the upper end of each of the grille plates 31. A connecting strip 44 is connected to the upper end of the column 43. Guide posts 45 are spaced left and right at the upper end of the connecting strip 44. Guide adjustment grooves 46 are spaced left and right on the first sliding plate 41. The two guide posts 45 are correspondingly arranged in the guide adjustment grooves 46. A first rack 47 is also provided on the first sliding plate 41. A second rack is provided on the second sliding plate 42. A transmission gear 49 meshes between the first rack 47 and the second rack. An adjustment lever 410 is also provided at the upper end of the second sliding plate 42.

[0039] During adjustment, the user moves the adjustment lever 410 on the hot air outlet housing 21, causing the second sliding plate 42, which is fixedly connected to the lever, to slide left and right. The adjustment lever 410 protrudes from the surface of the housing 100 for easy user operation. The second rack on the second sliding plate 42 meshes with the transmission gear 49. When the second sliding plate 42 slides, the second rack drives the transmission gear 49 to rotate. At the same time, the transmission gear 49 meshes with the first rack 47 on the first sliding plate 41, thereby driving the first sliding plate 41 to move in the opposite direction to the second sliding plate 42. The first slide plate 41 is provided with guide adjustment grooves 46 spaced left and right. The two guide posts 45 at the upper end of the connecting strip 44 are respectively embedded in the two guide adjustment grooves 46. When the first slide plate 41 slides left and right, the groove wall of the guide adjustment groove 46 will generate a lateral thrust on the guide post 45, forcing the guide post 45 to slide along the groove while driving the connecting strip 44 to move left and right at the same time. The lower end of the connecting strip 44 is connected to the column 43 at the upper end of all the grid plates 31. When the connecting strip 44 moves left and right, it will cause the grid plates 31 to swing synchronously around the hinge axis.

[0040] See Figures 2-6 As shown, the air valve assembly includes two diversion cylinders 51 that slide left and right within the diversion pipe 1. The diversion cylinders 51 slide within the second air outlet 4. The outer end of each diversion cylinder 51 is an open air outlet, and the inner end has an arc-shaped air guiding structure. An air inlet 52 is provided on the rear side of the inner end. In the first air outlet mode, the two diversion cylinders 51 move outward relative to each other, and the connection between the air inlet connection 2 and the second air outlet 4 is sealed through the inner end of each diversion cylinder 51. In the second air outlet mode, the two diversion cylinders 51 move inward relative to each other, and the connection between the air inlet connection 2 and the first air outlet 3 is sealed through the inner end of each diversion cylinder 51. The air inlet 52 is connected to the air inlet connection 2.

[0041] Regardless of the airflow mode, the basic principle of fan airflow drive remains the same: the fan motor assembly inside the fan base 5 starts, draws in air from the outside and compresses it to form a high-pressure airflow. The airflow is transported along the internal air duct of the base to the airflow outlet 6 at the top, then enters the straight air duct 7 and the bend in the air duct 8, and finally enters the split pipe 1 through the air inlet 2 connected by the bend in the air duct 8, and waits for the air valve assembly to complete the air duct switching before being output in a specific direction.

[0042] When switching to the first air outlet mode (outputting warm air), the two splitter cylinders 51 move outward relative to each other in the left-right direction within the splitter pipe 1 (i.e., the left splitter cylinder slides to the left and the right splitter cylinder slides to the right) until the air inlet 52 of the splitter cylinder 51 is in contact with the inner wall of the splitter pipe 1. At this time, the inner wall of the splitter pipe 1 seals the air inlet 52. Since the splitter cylinder 51 slides within the second air outlet 4, after it moves outward, its inner end will precisely cover and seal the air inlet connection 2 and the second air outlet 4. At the connection point of the two air outlets 4, the airflow path to the second air outlet 4 is blocked; at the same time, the sliding action will not affect the connection point between the air inlet connection 2 and the first air outlet 3, so that the path remains open; the high-pressure airflow entering the diversion pipe 1 flows along the open path between the air inlet connection 2 and the first air outlet 3, enters the hot air outlet housing 21 at the front end of the first air outlet 3, is heated by the electric heater 22 inside the housing to form warm air, and finally is discharged from the hot air outlet housing 21 to complete the warm air output.

[0043] When switching to the second air outlet mode (outputting cold air), the two splitter cylinders 51 move inwards towards each other in the left-right direction within the splitter pipe 1 until their inner ends are completely fitted together. After the two splitter cylinders 51 are fitted together, their common inner end covers and seals the connection between the air inlet connection 2 and the first air outlet 3, blocking the airflow path to the first air outlet 3. At the same time, the air inlet 52 on the rear side of the inner end of the splitter cylinder 51 is precisely aligned and connected with the air inlet connection 2, and the outer end of the splitter cylinder 51 is an open structure (connected to the second air outlet 4), forming an air inlet connection 2 - air inlet 52 - interior of the splitter cylinder 51 - The second air outlet 4 is the conduction path; the high-pressure airflow entering the diversion pipe 1 enters the interior of the two diversion cylinders 51 through the air inlet 52, and then flows into the cold air outlet pipe 10 through the second air outlet 4, and finally is directly discharged from the cold air outlet 11 at the front end of the cold air outlet pipe 10 to complete the cold air output.

[0044] See Figures 2-5As shown, a second adjustment component is also provided on the diversion pipe 1. The second adjustment component is used to drive the two diversion cylinders 51 to move outward synchronously or move inward synchronously. The second adjustment component is the power source and synchronous control core for the sliding of the diversion cylinders 51. Its core design goal is to ensure that the two diversion cylinders move completely synchronously during the switching process. Whether they move outward synchronously or move inward synchronously, the displacement of the two diversion cylinders must be consistent.

[0045] Furthermore, the second adjustment component includes guide grooves 71 spaced apart on the diversion pipe 1, and sliding columns 72 that slide within the guide grooves 71 are provided at the upper ends of both diversion cylinders 51. A transmission arm 74 is hinged to the upper end of each sliding column 72. A knob 73 is rotatably mounted at the upper end of the diversion pipe 1 and between the two guide grooves 71. The other end of the transmission arm 74 is hinged to the knob 73, and a torsion spring 75 is connected between the diversion pipe 1 and the sliding column 72.

[0046] One end of each of the two transmission arms 74 is hinged to a non-central position of the knob 73, and the other end is hinged to a sliding column 72 at the upper end of the two diversion cylinders 51. When the knob rotates, the hinge point between the transmission arm and the knob will move in a circular motion around the rotation axis, thereby generating a pushing and pulling force on the sliding column. For example, when the knob 73 rotates clockwise, the hinge points of the two transmission arms 74 move outward, and the transmission arms 74 push the sliding column 72 to slide to the left and right along the guide groove 71, causing the two diversion cylinders to move outward synchronously. Similarly, when the knob 73 rotates counterclockwise, the hinge points of the two transmission arms 74 move inward, and the transmission arms 74 pull the sliding column 72 to slide towards the center along the guide groove 71, causing the two diversion cylinders 51 to move inward synchronously.

[0047] It should be noted that, in order to improve the product's appearance and airtightness, the distributor 1 is encased in an outer shell (such as...). Figure 1 As shown, the outer casing completely encloses the diversion pipe 1, forming a sealed space. Through the tight fit between the outer casing and the diversion pipe 1 (e.g., using sealing strips or snap-fit ​​sealing structures), airflow exchange between the guide groove 71 and the external environment is effectively blocked, preventing airflow leakage from the groove gaps within the duct, further improving the overall airtightness of the duct and ensuring that air delivery efficiency is not affected. While enclosing the diversion pipe 1, the outer casing also features an adaptive design for the installation positions of the knob 73 and adjustment lever 410, allowing only a portion of the knob 73 and adjustment lever 410 to protrude from the outer casing, thus preserving the convenience of manual operation for the user. Furthermore, the outer casing structure is more harmonious with the overall style of the equipment, significantly enhancing the product's refined appearance and integrated visual effect.

[0048] The torsion spring 75 is made of a metal material (such as spring steel) with stable elastic properties. Its key design is bidirectional pre-tightening adaptation. According to the two target shapes of the diverter cylinder 51, the torsion spring 75 is preset with the corresponding elastic force during initial assembly. When the diverter cylinder 51 is in the outward expansion or inward closing state, the torsion spring 75 can generate a pre-tightening force that matches the shape, locking the sliding column in the corresponding position, thereby fixing the shape of the diverter cylinder 51.

[0049] Specifically, when the user rotates knob 73, the sliding column 72 is pushed outward along guide groove 71 via transmission arm 74, causing the two splitter cylinders to expand outward synchronously until the inner ends of the splitter cylinders are in contact with the inner wall of the splitter pipe, completing the shape change. At this time, torsion spring 75 undergoes elastic deformation due to the outward displacement of sliding column 72, forming a continuous outward tightening preload. This force acts directly on the sliding column, stabilizing it at the outer end of the guide groove, thus keeping the two splitter cylinders in an outward expanded state. Conversely, when the user rotates knob 73 in the opposite direction, the sliding column 72 is pulled inward along guide groove 71 via transmission arm 74, causing the two splitter cylinders to move inward synchronously until the inner ends of the two splitter cylinders are in contact with each other, completing the shape change. At this time, torsion spring 75 undergoes reverse elastic deformation with the inward displacement of sliding column, forming a continuous inward tightening preload. This force stabilizes the sliding column at the inner end of the guide groove, keeping the two splitter cylinders in an inward moving state.

[0050] By using a torsion spring to pre-tighten and lock the two modes in both directions, it is ensured that the diversion cylinder will not shift due to external interference under any target mode, thus guaranteeing the stable air delivery efficiency and effect of each air outlet mode.

[0051] Furthermore, a sensor 76 is also provided on the diversion pipe 1, and a flange that cooperates with the sensor 76 is provided on the knob 73. When the knob 73 drives the two diversion cylinders 51 to move outward synchronously, the flange triggers the sensor 76. A terminal block that is electrically connected to the sensor 76 and the electric heater 22 is provided on the diversion pipe 1, and a main control board that is electrically connected to the terminal block is also provided in the fan base 5.

[0052] The flange on knob 73 rotates synchronously with the knob and can directly contact the trigger button of the micro switch; the terminal block is fixed on the shunt tube 1, one end of which is electrically connected to the signal pin of the micro switch and the power pin of the electric heater 22 through a wire, and the other end is electrically connected to the main control board in the fan base 5 through a wire. It is responsible for the centralized relay of the micro switch signal and also for the transmission of power and control signals of the electric heater.

[0053] When the user rotates knob 73 to drive the two splitter cylinders 51 to move outward synchronously and switch to the warm air mode, as knob 73 rotates, the flange on the knob gradually approaches the micro switch. When the knob is rotated to its limit position, the flange directly presses the trigger button of the micro switch, causing the internal contacts of the micro switch to close and generating a trigger signal (unlike the non-contact signal of the infrared sensor, this is a mechanical contact type of clear on / off signal). The trigger signal of the micro switch is transmitted to the terminal block through a wire. The terminal block, as an intermediate integrated node, processes the signal. After the signal is processed, it is sent to the main control board in the fan base 5 via a wire. After receiving the conduction signal from the micro switch, the main control board determines through its built-in program that the warm air duct switching has been completed, and then outputs a control command to start the electric heater. The command is relayed to the electric heater 22 through the terminal block. At the same time, the main control board provides working power to the electric heater through the terminal block, and the electric heater starts heating. At this time, the airflow has entered the hot air outlet housing 21 through the conducted warm air duct, and after being heated, it forms warm air to be discharged, realizing the synchronization of duct switching and heating start-up.

[0054] In this invention, in order to facilitate the inspection and maintenance of the inside of the fan base 5 and to facilitate storage and transportation, the straight air duct 7 is detachably connected to the fan base 5.

[0055] See Figures 9-12 As shown, a connecting groove 81 is provided at the upper end of the fan base 5, and the airflow outlet 6 is provided on the connecting groove 81. A connecting end cap 82 is provided at the lower end of the straight air duct 7, and an installation ring 83 is provided at the lower end of the connecting end cap 82. The installation ring 83 is detachably installed in the connecting groove 81 by a rotation snap-fit ​​structure. A first electrical connector 84 is provided on the connecting end cap 82 for electrical connection with the terminal block. A second electrical connector 85 is also provided at the upper end of the fan base 5 for electrical connection with the main control board. When the installation ring 83 is installed in the connecting groove 81, the first electrical connector 84 and the second electrical connector 85 are electrically connected to each other.

[0056] When the straight duct 7 needs to be installed onto the fan base 5, first align the mounting ring 83 on the lower end of the connecting end cap 82 of the straight duct 7 with the connecting groove 81 at the upper end of the fan base 5. Since the connecting groove 81 is a recessed structure, the mounting ring 83 can be directly inserted into the groove to achieve initial positioning. Then, drive the mounting ring 83 to rotate synchronously in the connecting groove 81. The rotational locking structure between the mounting ring 83 and the connecting groove 81 engages with each other to achieve mechanical fixation between the straight duct 7 and the fan base 5. At the same time as the mounting ring 83 rotates and locks into place, the first electrical connector 84 on the connecting end cap 82 and the second electrical connector 85 at the upper end of the fan base 5 are precisely aligned and in contact.

[0057] After installation, the engagement state of the rotating snap-fit ​​structure can withstand the weight of the straight duct 7 itself and the vibration during airflow, preventing the straight duct from shifting. At the same time, the contact pressure between the first electrical connector 84 and the second electrical connector 85 is stable, ensuring reliable circuit conduction and preventing poor contact due to fan vibration, which would affect the hot and cold air switching function.

[0058] Furthermore, the rotating snap-fit ​​structure includes a snap-fit ​​flange 91 provided on the outer side wall of the mounting ring 83, and a snap-fit ​​groove 92 corresponding to the snap-fit ​​flange 91 is provided on the inner side wall of the connecting groove 81. The snap-fit ​​groove 92 includes a vertical groove 93 and a horizontal groove 94 communicating with one side of the lower end of the vertical groove 93. The snap-fit ​​flange 91 rotates and snaps into the horizontal groove 94 after passing through the vertical groove 93.

[0059] An arc-shaped groove 95 is provided at the upper end of the fan base 5, and a sliding seat 96 slides in the arc-shaped groove 95. The second electrical connector 85 includes a female plug provided on the sliding seat 96, and the first electrical connector 84 is a male plug that mates with the female plug.

[0060] When installing the straight duct pipe 7, it is necessary to simultaneously achieve "mechanical fixation of the snap-fit ​​flange and the snap-fit ​​groove" and "electrical connection of the male plug and the female plug". The specific process is as follows: Align the snap-fit ​​flange 91 of the mounting ring 83 at the lower end of the straight duct 7 with the vertical slot 93 of the connecting groove 81, and simultaneously align the first electrical connector (male plug) on ​​the connecting end cover 82 with the second electrical connector (female plug) on ​​the upper sliding seat 96 of the fan base 5; insert the mounting ring 83 downwards along the connecting groove 81, and the snap-fit ​​flange 91 slides down along the vertical slot 93 to the lower end, with the bottom of the mounting ring 83 fitting against the connecting groove 81. At this point, the front end of the male plug is in initial contact with the female plug, and the sliding seat 96 is in the initial position of the arc-shaped sliding groove 95; rotate the connecting end cover 82, causing the mounting ring 83 to rotate synchronously, at which point the snap-fit ​​flange 91 moves from the vertical slot 93 to the lower end of the connecting groove 81. 3. The lower end slides into the transverse slot 94 until the end of the transverse slot 94, achieving mechanical fixation. At the same time, during the rotation, the male plug rotates synchronously with the connecting end cover 82. Because the male plug and the female plug are in contact, the male plug will push the female plug to drive the sliding seat 96 to slide synchronously along the arc-shaped sliding groove 95, avoiding rigid friction caused by relative rotation of the plug. When the snap-fit ​​flange 91 reaches the end of the transverse slot 94, the sliding seat 96 also slides to the end of the arc-shaped sliding groove 95, and the male plug and the female plug are fully inserted and connected, forming a stable conductive path. After installation, the male plug and the female plug are completely hidden at the connection between the connecting end cover 82 and the fan base 5, with no live parts exposed.

[0061] Based on the accompanying drawings and the foregoing illustrations and descriptions, the basic principles and main features of the present invention, as well as its advantages, those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bladeless fan capable of switching between hot and cold air, comprising a fan base (5), a fan motor assembly disposed within the fan base (5), and an airflow outlet (6) disposed at the upper end of the fan base (5), characterized in that: A straight duct pipe (7) is installed on the air outlet (6). A duct bend pipe (8) is connected to the upper end of the straight duct pipe (7). A diverter pipe (1) is rotatably connected to the front end of the duct bend pipe (8). An air inlet connection port (2) is provided on the rear side of the diverter pipe (1), a first air outlet (3) is provided on the front side, and a second air outlet (4) is provided on both the left and right ends. The air inlet connection port (2) is connected to the duct bend pipe (8). A hot air outlet housing (21) is provided at the front end of the first air outlet (3). A hot air outlet housing (21) is provided inside the hot air outlet housing (21). An electric heater (22) is provided, and a cold air outlet pipe (10) is rotatably installed on each of the two second air outlets (4). A cold air outlet (11) is provided at the front end of each of the two cold air outlet pipes (10). A wind valve assembly is also provided in the diversion pipe (1). The wind valve assembly is used to switch between a first air outlet mode and a second air outlet mode. In the first air outlet mode, the air inlet connection port (2) is connected to the first air outlet (3), and in the second air outlet mode, the air inlet connection port (2) is connected to the two second air outlets (4).

2. The bladeless fan capable of switching between hot and cold air according to claim 1, characterized in that: A plurality of grille plates (31) are provided at intervals along the left and right direction at the air outlet of the hot air outlet housing (21). The grille plates (31) are hinged to the hot air outlet housing (21) so that the air outlet angle can be adjusted by swinging. A first adjustment component that can drive the grille plates (31) to swing is also provided on the hot air outlet housing (21).

3. A bladeless fan capable of switching between hot and cold air according to claim 2, characterized in that: The first adjustment component includes a first sliding plate (41) and a second sliding plate (42) that slide left and right on the hot air outlet housing (21). A column (43) is provided at the upper end of each of the grille plates (31). A connecting strip (44) is connected to the upper end of the column (43). A guide post (45) is spaced left and right at the upper end of the connecting strip (44). A guide adjustment groove (46) is spaced left and right on the first sliding plate (41). The two guide posts (45) are correspondingly arranged in the guide adjustment groove (46). A first rack (47) is also provided on the first sliding plate (41). A second rack is provided on the second sliding plate (42). A transmission gear (49) meshes between the first rack (47) and the second rack. An adjustment lever (410) is also provided at the upper end of the second sliding plate (42).

4. A bladeless fan capable of switching between hot and cold air according to claim 1, characterized in that: The air valve assembly includes two diversion cylinders (51) that slide left and right within the diversion pipe (1). The diversion cylinders (51) slide within the second air outlet (4). The outer end of the diversion cylinder (51) is an open air outlet, and the inner end is an arc-shaped air guide structure. An air inlet (52) is provided on the rear side of the inner end. In the first air outlet mode, the two diversion cylinders (51) move outward relative to each other and close the connection between the air inlet connection (2) and the second air outlet (4) through the inner end of the diversion cylinder (51). In the second air outlet mode, the two diversion cylinders (51) move inward relative to each other and close the connection between the air inlet connection (2) and the first air outlet (3) through the inner end of the two diversion cylinders (51). The air inlet (52) is connected to the air inlet connection (2).

5. A bladeless fan capable of switching between hot and cold air according to claim 4, characterized in that: A second adjustment component is also provided on the diversion pipe (1). The second adjustment component is used to drive the two diversion cylinders (51) to move outward synchronously or to move inward synchronously.

6. A bladeless fan capable of switching between hot and cold air according to claim 5, characterized in that: The second adjustment component includes guide grooves (71) spaced apart on the diversion pipe (1), and sliding columns (72) that slide in the guide grooves (71) are provided at the upper ends of the two diversion cylinders (51). A transmission arm (74) is hinged to the upper end of each sliding column (72). A knob (73) is rotatably installed at the upper end of the diversion pipe (1) and between the two guide grooves (71). The other end of the transmission arm (74) is hinged to the knob (73), and a torsion spring (75) is connected between the diversion pipe (1) and the sliding column (72).

7. A bladeless fan capable of switching between hot and cold air according to claim 6, characterized in that: A sensor (76) is also provided on the diversion pipe (1), and a flange that cooperates with the sensor (76) is provided on the knob (73). When the knob (73) drives the two diversion cylinders (51) to move outward synchronously, the flange triggers the sensor (76). A terminal block that is electrically connected to the sensor (76) and the electric heater (22) is provided on the diversion pipe (1), and a main control board that is electrically connected to the terminal block is also provided in the fan base (5).

8. A bladeless fan capable of switching between hot and cold air according to claim 7, characterized in that: The straight duct (7) is detachably connected to the fan base (5). A connecting groove (81) is provided at the upper end of the fan base (5). The air outlet (6) is located on the connecting groove (81). A connecting end cap (82) is provided at the lower end of the straight duct (7). An installation ring (83) is provided at the lower end of the connecting end cap (82). The installation ring (83) is detachably installed in the connecting groove (81) by a rotating snap-fit ​​structure. A first electrical connector (84) is provided on the connecting end cap (82) and is electrically connected to the terminal block. A second electrical connector (85) is also provided at the upper end of the fan base (5) and is electrically connected to the main control board. When the installation ring (83) is installed in the connecting groove (81), the first electrical connector (84) and the second electrical connector (85) are electrically connected to each other.

9. A bladeless fan capable of switching between hot and cold air according to claim 8, characterized in that: The rotating snap-fit ​​structure includes a snap-fit ​​flange (91) provided on the outer side wall of the mounting ring (83). The inner side wall of the connecting groove (81) is provided with a snap-fit ​​slot (92) that mates with the snap-fit ​​flange (91). The snap-fit ​​slot (92) includes a vertical slot (93) and a horizontal slot (94) connected to the lower end of the vertical slot (93). The snap-fit ​​flange (91) passes through the vertical slot (93) and then rotates into the horizontal slot (94).

10. A bladeless fan capable of switching between hot and cold air according to claim 8, characterized in that: An arc-shaped groove (95) is provided at the upper end of the fan base (5), and a sliding seat (96) slides in the arc-shaped groove (95). The second electrical connector (85) includes a female plug provided on the sliding seat (96), and the first electrical connector (84) is a male plug that mates with the female plug.

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