A retractable bladeless fan

Abstract

This utility model relates to a retractable bladeless fan. Users can adjust the fan height by stretching or retracting the inner straight tube, thereby changing the height of the air blowing assembly. This allows the fan to provide appropriate airflow in different scenarios, such as standing, sitting, or using it on desktops of varying heights, improving comfort and convenience. When stretching upwards, the spring force actively provides upward assistance, significantly reducing the external force required for the user to raise the fan. When retracting downwards, the weight of the inner straight tube and the connected air blowing assembly creates a downward driving force, further reducing the downward force required by the user. Retraction can be easily completed by overcoming the friction of the elastic friction positioning component. Both bidirectional operations require no effort from the user, making it especially suitable for the elderly, children, and other groups with less strength, or for scenarios requiring frequent height adjustments, significantly improving ease of operation and comfort.

Description

Technical Field

[0001] This utility model relates to the field of bladeless fan technology, and in particular to a retractable bladeless fan. Background Technology

[0002] Bladeless fans are gaining popularity among consumers due to their safety, aesthetics, and ease of cleaning. However, existing bladeless fans typically have rigid air outlet components and fixed air duct structures, lacking telescopic functionality. This results in significant space requirements during transportation, leading to higher costs; furthermore, their bulk makes them difficult to store when not in use. Furthermore, the fixed air duct height fails to meet the personalized fan height needs of different users in various scenarios. For example, users may prefer different air outlet heights when standing and sitting, and existing bladeless fans cannot adequately adapt to these variations. Therefore, a telescopic bladeless fan is needed to address the problems existing in the current technology. Utility Model Content

[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 retractable bladeless fan.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A retractable bladeless fan includes a fan base, a straight air duct at the upper end of the fan base, and a blower assembly connected to the upper end of the straight air duct. The straight air duct includes an outer straight tube and an inner straight tube that extends vertically above the upper end of the outer straight tube. The lower end of the outer straight tube is fixed to the fan base, and the upper end of the inner straight tube is fixed to the blower assembly. An inner tube end sleeve is provided at the lower end of the inner straight tube. The inner tube end sleeve slides vertically within the outer straight tube. An elastic friction positioning component and a coil spring are respectively provided on the inner tube end sleeve. The outer side of the elastic friction positioning component rubs against the inner wall of the outer straight tube, thereby positioning the inner tube end sleeve. An outer tube end sleeve for guiding the vertical sliding of the inner straight tube is provided at the upper end of the outer straight tube. One end of the coil spring is fixed to the inner tube end sleeve, and the other end is fixed to the outer tube end sleeve.

[0005] In some embodiments, the elastic friction positioning assembly includes mounting grooves disposed on the front and rear sides of the inner tube end sleeve, a friction seat is movably disposed in the mounting groove, a friction plate is disposed on the outer wall of the friction seat, and a spring is connected between the friction seat and the mounting groove.

[0006] In some embodiments, hooks are provided on both the left and right sides of the friction seat, and grooves for engaging with the hooks are provided on both the left and right sides of the mounting groove.

[0007] In some embodiments, there are circular grooves spaced apart on the inner wall of the mounting groove, and there are protrusions spaced apart on the inner side of the friction seat corresponding to the circular grooves. There are two springs, one end of which is sleeved on the protrusion and the other end is located in the circular groove.

[0008] In some embodiments, a roller is provided on the inner tube end sleeve, one end of the coil spring is fixedly sleeved on the roller, and the other end is fixed to the outer tube end sleeve by screws.

[0009] In some embodiments, a fan motor assembly is provided inside the fan base, an air inlet is provided on one side of the fan base, an air outlet is provided at the upper end of the fan base, and the lower end of the outer straight pipe is fixed to the air outlet.

[0010] In some embodiments, the blower assembly includes a duct bend located at the upper end of the inner straight pipe, one end of the duct bend is connected to a diverter pipe, and the two opposite ends of the diverter pipe are respectively connected to an air outlet pipe, and an air outlet is provided on the front side of the air outlet pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. The straight duct of the air duct adopts a telescopic structure. When the fan is not in use, the inner straight duct can be retracted downward into the outer straight duct, reducing the overall height of the fan, thereby reducing the space occupied, making it easier to store and tidy up, and also helping to reduce space costs during transportation and improve transportation efficiency.

[0012] 2. Users can adjust the height of the fan by stretching or retracting the inner straight tube according to their own needs, thereby changing the height of the air blowing component. This allows the fan to provide the appropriate airflow height in different scenarios, such as standing, sitting, or using it on a desktop of different heights, thus improving the comfort and convenience of use.

[0013] 3. The elastic friction positioning component on the inner tube end sleeve can rub against the inner wall of the outer straight tube to position the inner tube end sleeve, ensuring that the straight tube of the air duct will not expand or contract arbitrarily during use, thus guaranteeing the stability of the fan structure and the stability of the airflow.

[0014] 4. Furthermore, when stretching upwards, the spring force actively provides upward assistance, significantly reducing the external force required for the user to pull up; when retracting downwards, the weight of the inner straight tube and the connected blower assembly creates a downward driving force, also reducing the force applied downwards by the user. Retraction can be easily completed by overcoming the friction of the elastic friction positioning component. Both bidirectional operations require no effort from the user, making it especially suitable for the elderly, children, and other groups with less strength, or for scenarios requiring frequent height adjustments, significantly improving the convenience and comfort of operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the bladeless fan of this utility model.

[0016] Figure 2 This is one of the cross-sectional structural schematic diagrams of the straight pipe of the air duct of this utility model.

[0017] Figure 3 This is the second cross-sectional structural schematic diagram of the straight pipe of the air duct of this utility model.

[0018] Figure 4 This utility model Figure 2 A magnified structural diagram at point A.

[0019] Figure 5 This utility model Figure 3 A magnified structural diagram at point B.

[0020] Figure 6 This is a schematic diagram of the inner straight tube and the outer straight tube of this utility model.

[0021] Figure 7 This is a cross-sectional view of the inner tube end sleeve of this utility model. Detailed Implementation

[0022] The following detailed description provides various embodiments or examples for implementing this utility model. 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 this utility model and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0023] like Figures 1-7 A retractable bladeless fan is shown, comprising a fan base 1, a straight air duct 3 disposed on the upper end of the fan base 1, and a blower assembly connected to the upper end of the straight air duct 3. The straight air duct 3 includes an outer straight tube 4 and an inner straight tube 5 extending vertically above the upper end of the outer straight tube 4. The lower end of the outer straight tube 4 is fixed to the fan base 1, and the upper end of the inner straight tube 5 is fixed to the blower assembly. An inner tube end sleeve 6 is disposed at the lower end of the inner straight tube 5. The inner tube end sleeve 6 slides vertically inside the outer straight tube 4, and an elastic friction positioning component and a coil spring 7 are respectively disposed on the inner tube end sleeve 6. The outer side of the elastic friction positioning component rubs against the inner wall of the outer straight tube 4, thereby positioning the inner tube end sleeve 6. An outer tube end sleeve 8 is disposed at the upper end of the outer straight tube 4 for guiding the inner straight tube 5 to slide vertically. One end of the coil spring 7 is fixed to the inner tube end sleeve 6, and the other end is fixed to the outer tube end sleeve 8.

[0024] When the fan height needs to be adjusted, the inner straight tube 5 is stretched upwards, and the coil spring 7 releases its elastic force to provide upward assistance. At the same time, the elastic friction positioning component rubs against the inner wall of the outer straight tube 4, and is positioned by friction when stretched to the required height. When descending, the inner straight tube 5 is pressed down and slides downwards by its own weight. The elastic friction positioning component moves with it and is fixed again by friction after reaching the appropriate position. The outer tube end sleeve 8 and the inner tube end sleeve 6 guide the inner straight tube 5 throughout the entire extension and retraction process, ensuring the stability of the sliding direction.

[0025] This allows for adjustable airflow height of the bladeless fan, meeting the needs of different scenarios and users. The combination of the coil spring 7 and its own gravity makes the telescopic operation easier, while the elastic friction positioning component ensures stable positioning at any height. The outer tube end sleeve 8 and the inner tube end sleeve 6 ensure smooth telescopic process. The overall structure improves the practicality and convenience of the fan, while also saving storage and transportation space when retracted.

[0026] See Figure 4 , Figure 6 , Figure 7 As shown, the elastic friction positioning assembly includes mounting grooves 21 on the front and rear sides of the inner tube end sleeve 6, a friction seat 22 is movably disposed in the mounting groove 21, a friction plate is disposed on the outer wall of the friction seat 22, and a spring 24 is connected between the friction seat 22 and the mounting groove 21.

[0027] When the inner straight tube 5 extends or retracts, the friction seat 22 moves with the inner tube end sleeve 6, and the friction plate rubs against the inner wall of the outer straight tube 4; the spring 24 always applies an outward pushing force to the friction seat 22, so that the friction plate maintains pressure against the inner wall of the outer straight tube 4, thereby generating sufficient friction force to achieve positioning; during the extension and retraction process, the friction force can be adaptively adjusted with the slight deformation of the spring 24 to ensure stable friction effect.

[0028] The spring 24 provides the friction seat 22 with a certain degree of elastic cushioning, preventing the friction plate from hard contacting the inner wall of the outer straight tube 4 and thus avoiding increased wear and extending the service life of the component. At the same time, the stable friction ensures the reliable positioning of the inner straight tube 5 at any height, and the structure is simple, easy to manufacture and assemble.

[0029] Furthermore, hooks 31 are provided on both the left and right sides of the friction seat 22, and hook grooves 32 for engaging with the hooks 31 are provided on both the left and right sides of the mounting groove 21.

[0030] When the friction seat 22 moves under the thrust of the spring 24 and the reaction force of the inner wall of the outer straight tube 4, the hook 31 moves synchronously in the hook groove 32. The hook groove 32 limits the hook 31, preventing the friction seat 22 from disengaging from the mounting groove 21 in the lateral direction, and ensuring that the friction seat 22 always moves stably in the mounting groove 21.

[0031] The combination of the hook 31 and the groove 32 effectively enhances the stability of the friction seat 22 installation, prevents the friction seat 22 from falling out of the mounting groove 21 during long-term use or frequent expansion and contraction, ensures the continuity and reliability of the elastic friction positioning component function, and reduces the failure rate.

[0032] Furthermore, there are circular grooves 41 spaced on the left and right sides of the inner wall of the mounting groove 21, and there are protrusions 42 spaced on the left and right sides of the inner side of the friction seat 22 corresponding to the circular grooves 41. There are two springs 24, one end of which is respectively sleeved on the protrusion 42, and the other end is located in the circular groove 41.

[0033] The spring 24 is positioned and installed at both ends through the protrusion 42 and the circular groove 41, ensuring that the spring 24 will not shift or fall off when it is stretched or contracted. The two springs 24 are evenly distributed on the inner side of the friction seat 22, making the elastic force on the friction seat 22 more balanced, thereby making the contact pressure between the friction plate and the inner wall of the outer straight tube 4 evenly distributed and the friction force stable.

[0034] See Figures 5-7 As shown, a roller 51 is provided on the inner tube end sleeve 6, one end of the coil spring 7 is fixedly sleeved on the roller 51, and the other end is fixed to the outer tube end sleeve 8 by screw 52.

[0035] When the inner straight tube 5 extends upward, the inner tube end sleeve 6 drives the roller 51 to rise, and the coil spring 7 will deform and rebound. Since the outer tube end sleeve 8 is fixed, the coil spring 7 generates an upward force to assist the inner straight tube 5 in extending. When the inner straight tube 5 descends, the roller 51 moves down with the inner tube end sleeve 6, and the coil spring 7 is stretched.

[0036] See Figure 1 As shown, a fan motor assembly is provided inside the fan base 1, an air inlet 61 is provided on one side of the fan base 1, an air outlet is provided at the upper end of the fan base 1, and the lower end of the outer straight pipe 4 is fixed to the air outlet.

[0037] The blower assembly includes a duct bend 71 located at the upper end of the inner straight pipe 5. One end of the duct bend 71 is connected to a diversion pipe 72, and the two opposite ends of the diversion pipe 72 are respectively connected to an air outlet pipe 73. An air outlet 74 is provided on the front side of the air outlet pipe 73.

[0038] After the fan motor assembly starts, it draws in outside air through the air inlet 61. After being pressurized by the motor assembly, the air enters the outer straight pipe 4 from the air outlet at the top of the base, and then is transported to the air duct bend 71 through the outer straight pipe 4 and the inner straight pipe 5. After being turned by the air duct bend 71, it enters the diversion pipe 72. The diversion pipe 72 evenly distributes the airflow to the air outlet pipes 73 at both ends. Finally, the airflow is blown out from the air outlet 74 on the front side of the air outlet pipe 73, achieving large-scale air delivery.

[0039] Of course, the fan base 1, fan motor assembly, and air blowing assembly are existing standard settings, and will not be described in detail here.

[0040] Based on the accompanying drawings and the foregoing display and description of the basic principles, main features, and advantages of this utility model, those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A telescopic bladeless fan, comprising a fan base (1), a straight pipe (3) of air duct is arranged on the upper end of the fan base (1), and a blowing assembly is communicated with the upper end of the straight pipe (3), characterized in that: The straight duct (3) includes an outer straight duct (4) and an inner straight duct (5) that extends and retracts from the upper end of the outer straight duct (4). The lower end of the outer straight duct (4) is fixed to the fan base (1), and the upper end of the inner straight duct (5) is fixed to the blower assembly. An inner tube end sleeve (6) is provided at the lower end of the inner straight duct (5). The inner tube end sleeve (6) slides up and down inside the outer straight duct (4). An elastic friction positioning component and a coil spring (7) are respectively provided on the inner tube end sleeve (6). The outer side of the elastic friction positioning component rubs against the inner wall of the outer straight duct (4) to position the inner tube end sleeve (6). An outer tube end sleeve (8) is provided at the upper end of the outer straight duct (4) to guide the inner straight duct (5) to slide up and down. One end of the coil spring (7) is fixed to the inner tube end sleeve (6), and the other end is fixed to the outer tube end sleeve (8).

2. A bladeless fan according to claim 1, wherein: The elastic friction positioning assembly includes mounting grooves (21) on the front and rear sides of the inner tube end sleeve (6), a friction seat (22) is movably disposed in the mounting groove (21), a friction plate is disposed on the outer wall of the friction seat (22), and a spring (24) is connected between the friction seat (22) and the mounting groove (21).

3. A bladeless fan according to claim 2, wherein: Hooks (31) are provided on both the left and right sides of the friction seat (22), and hook grooves (32) for cooperating with the hooks (31) are provided on both the left and right sides of the mounting groove (21).

4. A bladeless fan according to claim 3, wherein: There are circular grooves (41) spaced on the left and right sides of the inner wall of the mounting groove (21), and there are protrusions (42) spaced on the left and right sides of the inner side of the friction seat (22) corresponding to the circular grooves (41). There are two springs (24), one end of which is sleeved on the protrusion (42) and the other end is located in the circular groove (41).

5. A bladeless fan according to claim 1, wherein: A roller (51) is provided on the inner tube end sleeve (6). One end of the coil spring (7) is fixedly sleeved on the roller (51), and the other end is fixed to the outer tube end sleeve (8) by screws (52).

6. A bladeless fan according to claim 1, wherein: A fan motor assembly is provided inside the fan base (1), an air inlet (61) is provided on one side of the fan base (1), an air outlet is provided at the upper end of the fan base (1), and the lower end of the outer straight pipe (4) is fixed to the air outlet.

7. A bladeless fan according to claim 1, wherein: The blowing assembly includes a duct bend (71) located at the upper end of the inner straight pipe (5). One end of the duct bend (71) is connected to a diversion pipe (72), and the two opposite ends of the diversion pipe (72) are respectively connected to an air outlet pipe (73). An air outlet (74) is provided on the front side of the air outlet pipe (73).

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