Variable air duct fan

Abstract

The utility model discloses a fan of variable air duct relates to fan accessories field, including the air duct, the air duct's air outlet end is provided with telescopic subassembly, the telescopic subassembly includes the inner cover and the outer cover of mutual insertion, the inner cover is formed with first air duct in, the inner cover air outlet end is formed with the first department of outward inclination, the outer cover air outlet end is formed with the second department of outward inclination, the relative position adjustment of inner cover and outer cover, make first department and second department abut or separate, first department and second part separate, make second air duct between them, and second air duct is outward inclination shape. The utility model discloses through the relative position of axial push -and -pull inner cover and outer cover, makes second air duct close or open, realized the one-step switching of the wind gathering state and the air spreading state, avoided the tediousness and time consumption of multistep operation, and the whole switching process only needs the linear displacement along the air duct axis direction, does not need the surrounding operation space, widens the applicable occasion.

Description

Technical Field

[0001] This utility model relates to the field of fan accessories, and more particularly to a fan with a variable airflow duct. Background Technology

[0002] Fans, as a basic airflow regulation device, have been widely used, but their core drawback lies in the rigidity of their function caused by the fixed structure of the air duct. The shape and size of the air outlet of a traditional fan cannot be changed once set, which makes the airflow pattern it produces fixed, whether it is a concentrated bundle of wind or a widely diffused wind. This inherent uniformity seriously limits the breadth of its application scenarios.

[0003] Chinese patent application No. 201921838869.8 discloses a mesh cover for an ion fan, comprising a mesh cover body and an ion fan housing. The ion fan housing has a slide rail on each of its left and right sides, and the mesh cover body is located in the middle of the slide rail. A slide rod runs through the top of the mesh cover body, and slide balls are integrally formed on both sides of the slide rod. The slide balls cooperate with the slide rail. The mesh cover body includes warp lines for guidance and annular lines for air concentration. This solves the problem that ordinary ion fans cannot quickly switch between the functions of air dispersion and air expansion when dealing with different production scenarios. In the aforementioned comparative document, by switching the front and back of the mesh body, and with the help of the circular and warp lines, it is possible to switch between two different states: wind dispersion and wind concentration. However, there are still some shortcomings in its use. For example, when switching between wind dispersion and wind concentration, the document requires steps such as unlocking the mesh, flipping the mesh, and relocking the mesh, making the switching process too cumbersome and time-consuming, and unable to be done quickly. At the same time, due to the size of the mesh itself, a certain amount of space is required when flipping the mesh to achieve the switching between wind dispersion and wind concentration, which also limits the scenarios in which wind dispersion and wind concentration can be switched.

[0004] Therefore, a variable air duct fan is proposed to solve the problems of cumbersome steps in switching between air dispersion and air concentration, and limited application scenarios. Utility Model Content

[0005] The purpose of this invention is to provide a fan with a variable air duct to solve the problems of cumbersome steps and limited application scenarios when switching between air dispersion and air concentration.

[0006] To achieve this objective, the present invention adopts the following technical solution: A variable air duct fan includes a fan casing. A telescopic component is provided at the air outlet end of the fan casing. The telescopic component includes an inner sleeve and an outer sleeve that are inserted into each other. A first air duct is formed inside the inner sleeve. A first part that is inclined outward is formed at the air outlet end of the inner sleeve. A second part that is inclined outward is formed at the air outlet end of the outer sleeve. The relative positions of the inner sleeve and the outer sleeve are adjusted so that the first part and the second part abut or separate. When the first part and the second part are separated, a second air duct is formed between them, and the second air duct is inclined outward.

[0007] Preferably, the telescopic component is connected to the air duct via a snap-fit ​​unit, and the inner sleeve is connected to the outer sleeve via a limiting unit.

[0008] Preferably, the snap-fit ​​unit is disposed on the outer casing. The snap-fit ​​unit includes a first elastic part and a first snap-fit ​​part. A first groove is provided at the end of the outer casing near the air duct. The first elastic part is disposed on the side wall of the first groove near the air duct. The first snap-fit ​​part is disposed on the outer periphery of the first elastic part, and the side of the first snap-fit ​​part near the air duct is set as an inclined surface. A first snap-fit ​​groove is provided on the inner wall of the air duct at the position corresponding to the first snap-fit ​​part. The first snap-fit ​​part snaps into the first snap-fit ​​groove, thereby connecting the outer casing and the air duct.

[0009] Preferably, a guide strip is provided on the outer casing along its axial direction, and an outlet groove is provided on the inner wall of the air duct at the position corresponding to the guide strip, and the guide strip is connected to the guide groove.

[0010] Preferably, the limiting unit includes a limiting seat and a limiting block. The limiting seat is disposed on the inner wall of the outer sleeve along the axis of the outer sleeve, and the limiting block is disposed on the outer periphery of the inner sleeve corresponding to the position of the limiting seat. The limiting seat is a groove structure missing on the side facing the inner sleeve. A first limiting block, a second limiting block and a blocking block are formed sequentially in the limiting seat towards the inner sleeve. Both sides of the first limiting block and the second limiting block are set as inclined surfaces along the distribution direction. The blocking block is set as an inclined surface on the side facing the inner sleeve. The limiting block has a protrusion on the side away from the inner sleeve, and both sides of the protrusion along the distribution direction of the limiting block are set as inclined surfaces. The limiting block is slidably connected in the limiting seat. When the first part and the second part abut, the protrusion is located between the first limiting block and the inner wall of the limiting seat; when the first part and the second part separate, the protrusion is between the blocking block and the second limiting block.

[0011] Preferably, the snap-fit ​​unit is disposed on the inner sleeve, and the snap-fit ​​unit includes a second elastic part and a second snap-fit ​​part. The end of the inner sleeve near the air duct is provided with a second groove. The second elastic part is disposed on the side wall of the second groove near the air duct. The second snap-fit ​​part is disposed on the outer periphery of the second elastic part, and the side of the second snap-fit ​​part near the air duct is set as an inclined surface. A snap-fit ​​block is disposed on the inner wall of the air duct along its axial direction, and the side of the snap-fit ​​block facing the inner sleeve is set as an inclined surface. The second snap-fit ​​part abuts against the side of the snap-fit ​​block away from the inner sleeve, so that the inner sleeve is connected to the air duct.

[0012] Preferably, a gap is formed between the second elastic part and the inner wall of the second groove, and an assembly block is provided on the inner wall of the air duct along its axial direction, with the side of the assembly block away from the air duct extending into the gap, and the assembly block is inserted between the second elastic part and the inner wall of the second groove.

[0013] Preferably, the inner wall of the outer jacket is provided with a insertion groove, and the outer jacket is connected to the air duct through the insertion groove. The limiting unit includes a positioning block and a first connecting block and a second connecting block arranged sequentially towards the outer jacket. The positioning block is disposed on the inner peripheral wall of the insertion groove. A receiving groove is provided on the outer periphery of the air duct corresponding to the position of the positioning block and facing the positioning block. The first connecting block and the second connecting block are disposed in the receiving groove. When the first part and the second part abut together, the positioning block is located between the first connecting block and the second connecting block; when the first part and the second part separate, the end of the air duct corresponding to the air outlet abuts against the inner wall of the insertion groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention relates to a variable duct fan. By axially pushing and pulling the relative positions of the inner and outer sleeves, the physical structure of the duct is changed, allowing the first and second parts to quickly contact or separate, thus closing or opening the second duct. This achieves a one-step switching between air-gathering and air-expanding states, avoiding the cumbersome and time-consuming nature of multi-step operations, improving switching efficiency and ease of operation. Furthermore, the entire switching process requires only linear displacement along the duct axis, eliminating the need for surrounding operating space. This allows the movement of the inner and outer sleeves to be freely applied even in confined environments, broadening its applicability. Therefore, this invention effectively solves the problems of cumbersome steps and limited application scenarios when switching between air-gathering and air-dispersing modes. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0017] Figure 1 This is a schematic diagram of the first overall structure of the present invention; Figure 2 This is a schematic diagram of another structure of the first integral part of this utility model; Figure 3 This is a schematic diagram showing the disassembled structure of the limiting seat and the limiting block in this utility model; Figure 4 This is a schematic diagram of the second overall structure in this utility model; Figure 5 This is a schematic diagram of another structure of the second integral part in this utility model; Figure 6 This is a schematic diagram showing the disassembled structure of the second snap-fit ​​part and the snap-fit ​​part in this utility model; Figure 7 This is a schematic diagram of the internal structure of the limiting seat in this utility model; Figure 8 This is a schematic diagram showing the disassembled structure of the limiting seat and the limiting block in this utility model; Figure 9 This is a schematic diagram of the connection structure between the limiting seat and the blocking block in this utility model; Figure 10 This is a schematic diagram of the connection structure between the limiting block and the protrusion in this utility model; Figure 11 This is a schematic diagram of the connection structure between the second elastic part and the second snap-fit ​​part in this utility model; Figure 12 This is a schematic diagram of the connection structure between the first connecting block and the receiving groove in this utility model; Figure 13 This is a schematic diagram of the connection structure between the second snap-fit ​​part and the second groove in this utility model; Figure 14 This is a schematic diagram of the connection structure between the positioning block and the insertion slot in this utility model; Figure 15 This is a schematic diagram showing the connection between the air duct and the assembly block in this utility model.

[0018] Illustrations: 1. Air duct; 2. Telescopic assembly; 3. Inner sleeve; 31. First part; 32. First air duct; 4. Snap-fit ​​unit; 411. First elastic part; 412. First snap-fit ​​part; 413. First groove; 414. First snap-fit ​​groove; 415. Guide strip; 416. Guide groove; 421. Second elastic part; 422. Second snap-fit ​​part; 423. Second groove; 424. Snap-fit ​​block; 425. Gap; 426. Assembly block; 5. Limiting unit; 511. Limiting seat; 512. First limiting block; 513. Second limiting block; 514. Blocking block; 515. Limiting block; 516. Protrusion; 521. Positioning block; 522. First connecting block; 523. Second connecting block; 524. Insertion groove; 525. Receiving groove; 6. Outer sleeve; 61. Second part; 62. Second air duct. Detailed Implementation

[0019] To make the utility model's objectives, features, and advantages more apparent and understandable, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0021] Example 1: Please see Figures 1-15 A variable air duct fan in this embodiment includes a fan duct 1. The fan duct 1 is characterized by having a telescopic component 2 at its air outlet end. The telescopic component 2 includes an inner sleeve 3 and an outer sleeve 6 that are inserted into each other. A first air duct 32 is formed inside the inner sleeve 3. A first part 31 that is inclined outward is formed at the air outlet end of the inner sleeve 3. A second part 61 that is inclined outward is formed at the air outlet end of the outer sleeve 6. The relative positions of the inner sleeve 3 and the outer sleeve 6 are adjusted so that the first part 31 and the second part 61 abut or separate. When the first part 31 and the second part 61 separate, a second air duct 62 is formed between them, and the second air duct 62 is inclined outward.

[0022] It should be noted that, under normal conditions, the first part 31 and the second part 61 are connected. The air outlet of the ventilation duct 1 is discharged through the first air duct 32. When the airflow passes through the first air duct 32, it is blown out in a concentrated state to achieve air concentration. Figure 7 and Figure 12 As shown; in the working state, the first part 31 and the second part 61 separate to form a second air duct 62. The air outlet of the air duct 1 will be discharged simultaneously through the first air duct 32 and the second air duct 62. When the airflow passes through the outwardly inclined second air duct 62, it is diffused and blown out, realizing air expansion, as shown. Figure 8 and Figure 11 As shown.

[0023] In application, when it is necessary to switch between the air gathering state and the air expansion state, the user moves the telescopic component 2 and pushes and pulls the inner sleeve 3 and the outer sleeve 6 to make relative axial movement. After the inner sleeve 3 and the outer sleeve 6 move and the first part 31 and the second part 61 switch from contact to separation, the second air duct 62 is formed. When the airflow passes through the outwardly inclined second air duct 62, it is diffused and blown out, thus realizing air expansion.

[0024] It is known that by pushing and pulling, the relative positions of the inner sleeve 3 and the outer sleeve 6 are linearly adjusted, allowing the first part 31 and the second part 61 to abut or separate, thus achieving the switching between the air-gathering state and the air-expanding state. This method replaces the cumbersome multi-step process with a push-pull mechanism, simplifying the operation process and shortening the time required to switch between the air-gathering state and the air-expanding state. This allows users to quickly and conveniently switch seamlessly between the air-gathering and air-expanding modes. At the same time, since the entire switching process is carried out entirely along the axis of the air duct 1, it only requires a small axial space to complete. This allows the fan with the telescopic component 2 to be used freely in compact scenarios with limited space, thus broadening its applicable occasions.

[0025] Specifically, the telescopic component 2 is connected to the air duct 1 via the snap-fit ​​unit 4, and the inner sleeve 3 is connected to the outer sleeve 6 via the limiting unit 5.

[0026] It should be noted that the telescopic component 2 is connected to the air duct 1 via the snap-fit ​​unit 4, enabling rapid assembly and reliable fixation between the telescopic component 2 and the air duct 1. This ensures that the telescopic component 2 can be stably maintained in the designated working position at the air outlet end of the air duct 1, preventing accidental detachment or displacement during use. It also provides the necessary support for push-pull operations in both air-gathering and air-expanding states, allowing for smooth adjustment of the relative positions of the inner sleeve 3 and the outer sleeve 6. Furthermore, the connection between the inner sleeve 3 and the outer sleeve 6 via the limiting unit 5 provides a reliable limit to their relative movement. The positioning unit 4 ensures that the sliding trajectory of the inner sleeve 3 and the outer sleeve 6 is controllable, preventing the inner sleeve 3 and the outer sleeve 6 from deviating or getting stuck during the pushing and pulling process. At the same time, it limits the relative movement range of the inner sleeve 3 and the outer sleeve 6, ensuring that the first part 31 and the second part 61 can smoothly achieve complete contact, while avoiding the inner sleeve 3 and the outer sleeve 6 from separating. In summary, the synergistic effect of the locking unit 4 and the limiting unit 5 not only enables the telescopic component 2 to be pushed and pulled conveniently, but also ensures the stability, reliability and durability of the entire telescopic component 2, making the switching operation between the wind gathering state and the wind expanding state easy, smooth and precise.

[0027] Example 2: The basic content is the same as in Example 1, except that: Please see Figures 7-10 In this embodiment, the snap-fit ​​unit 4 is disposed on the outer casing 6. The snap-fit ​​unit 4 includes a first elastic part 411 and a first snap-fit ​​part 412. A first groove 413 is provided at the end of the outer casing 6 near the air duct 1. The first elastic part 411 is disposed on the side wall of the first groove 413 near the air duct 1. The first snap-fit ​​part 412 is disposed on the outer periphery of the first elastic part 411, and the side of the first snap-fit ​​part 412 near the air duct 1 is set as an inclined surface. A first snap-fit ​​groove 414 is provided on the inner wall of the air duct 1 at the position corresponding to the first snap-fit ​​part 412. The first snap-fit ​​part 412 snaps into the first snap-fit ​​groove 414, so that the outer casing 6 is connected to the air duct 1.

[0028] It should be noted that the outer sleeve 6 in the telescopic component 2 is connected to the air duct 1 through the snap-fit ​​unit 4. At the same time, the relative position of the inner sleeve 3 and the outer sleeve 6 can be adjusted by moving the inner sleeve 3 to achieve the adjustment of air gathering and air expansion.

[0029] When the telescopic component 2 needs to be installed on the air duct 1, the end of the outer jacket 6 is aligned with the air outlet end of the air duct 1 and inserted. At this time, the inclined surface of the first snap-fit ​​part 412 on the outer jacket 6 will contact the end of the air duct 1. As the pushing force continues to be applied, the inclined surface of the first snap-fit ​​part 412 will be forced to elastically deform the first elastic part 411 into the first groove 413, thereby causing the first snap-fit ​​part 412 to radially contract and smoothly slide into the air duct 1. When the first snap-fit ​​part 412 slides to the position aligned with the first snap-fit ​​groove 414 on the inner wall of the air duct 1, the elastic restoring force of the first elastic part 411 will drive the first snap-fit ​​part 412 to pop out and snap into the first snap-fit ​​groove 414. At this time, the outer jacket 6 and the air duct 1 are firmly connected together.

[0030] It is known that, through the first snap-fit ​​part 412 and the first elastic part 411 in the snap-fit ​​unit 4, based on the principle of elastic deformation and inclined plane guidance, the air duct 1 and the outer jacket 6 are firmly connected, ensuring the connection effect.

[0031] Furthermore, a guide strip 415 is provided on the outer casing 6 along its axial direction, and an outlet groove is provided on the inner wall of the air duct 1 at the position corresponding to the guide strip 415, and the guide strip 415 is connected to the guide groove 416.

[0032] It is known that when installing the telescopic assembly 2, the guide strip 415 on the outer sleeve 6 must be aligned with the guide groove 416 on the inner wall of the air duct 1 before it can be inserted. When connecting the air duct 1 to the telescopic assembly 2, the guide strip 415 is aligned with the guide groove 416. As the outer sleeve 6 is inserted, the guide strip 415 is constrained within the guide groove 416. Through the cooperation between the guide strip 415 and the guide groove 416, the telescopic assembly 2 can be prevented from rotating circumferentially within the air duct 1, ensuring that the entire telescopic assembly 2 can only move along the axis. This eliminates any rotational freedom that may affect the locking and limiting functions, resulting in better operation and a longer service life.

[0033] Furthermore, the limiting unit 5 includes a limiting seat 511 and a limiting block 515. The limiting seat 511 is disposed on the inner wall of the outer sleeve 6 along the axial direction of the outer sleeve 6, and the limiting block 515 is disposed on the outer periphery of the inner sleeve 3 corresponding to the position of the limiting seat 511. The limiting seat 511 is a groove structure missing on the side facing the inner sleeve 3. The limiting seat 511 has a first limiting block 512, a second limiting block 513 and a blocking block 514 formed sequentially in the direction of the inner sleeve 3. The first limiting block 512 and the second limiting block 513 are both set as inclined surfaces on both sides along the distribution direction, and the blocking block 514 is set as an inclined surface on the side facing the inner sleeve 3. The limiting block 515 has a protrusion 516 on the side away from the inner sleeve 3, and both sides of the protrusion 516 along the distribution direction of the limiting block 515 are set as inclined surfaces. The limiting block 515 is slidably connected in the limiting seat 511. When the first part 31 and the second part 61 come into contact, the protrusion 516 is located between the inner wall of the first limiting block 512 and the limiting seat 511; when the first part 31 and the second part 61 separate, the protrusion 516 is between the blocking block 514 and the second limiting block 513.

[0034] It should be noted that during the air-gathering state, the first part 31 and the second part 61 abut against each other, the limiting block 515 is located inside the limiting seat 511, and the protrusion 516 is also located between the first limiting block 512 and the inner wall of the limiting seat 511. This position is achieved by the cooperation of the inclined surfaces to lock the inner sleeve 3, making the first air duct 32 the main air outlet channel, and the airflow is concentrated and blown out. When it is necessary to switch to the air-expanding state, the inner sleeve 3 begins to slide outward relative to the outer sleeve 6, and the limiting block 515 and the protrusion 516 move accordingly within the limiting seat 511. Since the sides of the protrusion 516, the first limiting block 512, and the second limiting block 513 are all inclined, the protrusion 516 can pass through the first limiting block 512 and the second limiting block 513. After the protrusion 516 passes the second limiting block 513, it is restricted between the blocking block 514 and the second limiting block 513. At this time, the inner sleeve 3 has been pulled out, the first part 31 and the second part 61 are separated, and an outwardly inclined second air duct 62 is formed between them. When the airflow passes through the first air duct 32, it will also pass through the second air duct 62, thereby being diffused to achieve air expansion.

[0035] It should also be noted that when it is necessary to switch the air expansion state to the air concentration state, the inner sleeve 3 is pushed into the air duct 1, the protrusion 516 returns along the original path, passes over the second limiting block 513 and the first limiting block 512 again, and is locked between the first limiting block 512 and the inner wall of the limiting seat 511. The first part 31 and the second part 61 re-abut each other, and the second air duct 62 is closed.

[0036] It is known that by pushing and pulling the inner sleeve 3, one can quickly and intuitively switch between the air gathering and air dispersing modes, simplifying the steps. At the same time, with the cooperation of the protrusion 516, the first limiting block 512, the second limiting block 513 and the blocking block 514, the stability and accuracy of the inner sleeve 3 in the two working positions are ensured, preventing it from sliding on its own.

[0037] It is worth noting that the first elastic part 411, the protrusion 516, the first limiting block 512, the second limiting block 513 and the blocking block 514 are all made of elastic plastic material. During the switching process between the wind gathering state and the wind expanding state, the above components ensure the switching process through their own elasticity. At the same time, the specific plastic materials of the above components are well known to those skilled in the art, and will not be described in this embodiment.

[0038] Example 3: The basic content is the same as in Example 1, except that: Please see Figures 11-15 In this embodiment, the snap-fit ​​unit 4 is disposed on the inner sleeve 3. The snap-fit ​​unit 4 includes a second elastic part 421 and a second snap-fit ​​part 422. A second groove 423 is provided at the end of the inner sleeve 3 near the air duct 1. The second elastic part 421 is disposed on the side wall of the second groove 423 near the air duct 1. The second snap-fit ​​part 422 is disposed on the outer periphery of the second elastic part 421, and the side of the second snap-fit ​​part 422 near the air duct 1 is set as an inclined surface. A snap-fit ​​block 424 is disposed on the inner wall of the air duct 1 along its axial direction, and the side of the snap-fit ​​block 424 facing the inner sleeve 3 is set as an inclined surface. The second snap-fit ​​part 422 and the side of the snap-fit ​​block 424 away from the inner sleeve 3 abut against each other, so that the inner sleeve 3 is connected to the air duct 1.

[0039] It should be noted that the inner sleeve 3 in the telescopic component 2 is connected to the air duct 1 through the snap-fit ​​unit 4. By moving the outer sleeve 6, the relative position between the outer sleeve 6 and the inner sleeve 3 changes, thereby achieving the switching between the air gathering state and the air expanding state.

[0040] It should also be noted that when the inner sleeve 3 on the telescopic component 2 is installed on the air duct 1, the inclined surface on the second snap-fit ​​part 422 will contact the inclined surface on the snap-fit ​​block 424. As the inner sleeve 3 continues to advance, the interaction of the inclined surfaces will compress the second elastic part 421 into the second groove 423 to produce elastic deformation, causing the second snap-fit ​​part 422 to contract radially and thus pass over the snap-fit ​​block 424. After the second snap-fit ​​part 422 passes over the snap-fit ​​block 424, the restoring force of the second elastic part 421 will cause it to pop outward. At this time, the second snap-fit ​​part 422 abuts against the side of the snap-fit ​​block 424 away from the inner sleeve 3. This reverse abutting action effectively prevents the inner sleeve 3 from accidentally coming out of the air duct 1, achieving a firm connection.

[0041] Furthermore, a gap 425 is formed between the second elastic part 421 and the inner wall of the second groove 423. An assembly block 426 is provided on the inner wall of the air duct 1 along its axial direction, and the side of the assembly block 426 away from the air duct 1 extends into the gap 425. The assembly block 426 is inserted between the second elastic part 421 and the inner wall of the second groove 423.

[0042] It should be noted that when the inner sleeve 3 is installed onto the air duct 1 via the snap-fit ​​unit 4, the end of the assembly block 426 will be inserted into the gap 425 formed between the second elastic part 421 and the inner sidewall of the second groove 423. With the cooperation of the assembly block 426 and the gap 425, the radial sway of the inner sleeve 3 in the air duct 1 can be further restricted, making the fixation of the inner sleeve 3 more stable, thereby ensuring the concentricity of the first air duct 32 and the air duct 1, which is conducive to the stable output of airflow.

[0043] It is known that the snap-fit ​​unit 4 ensures that the connection is tighter when the inner sleeve 3 is subjected to outward pulling force, effectively preventing accidental detachment during operation, and improving safety and reliability. At the same time, the cooperation between the assembly block 426 and the gap 425 improves the mechanical life of the snap-fit ​​unit 4 and the working stability of the inner sleeve 3.

[0044] Furthermore, an insertion groove 524 is provided on the inner wall of the outer jacket 6, and the outer jacket 6 is connected to the air duct 1 through the insertion groove 524. The limiting unit 5 includes a positioning block 521 and a first connecting block 522 and a second connecting block 523 arranged sequentially in the direction of the outer jacket 6. The positioning block 521 is disposed on the inner peripheral wall of the insertion groove 524. A receiving groove 525 is provided on the outer periphery of the air duct 1 corresponding to the position of the positioning block 521 and facing the positioning block 521. The first connecting block 522 and the second connecting block 523 are disposed in the receiving groove 525. When the first part 31 abuts against the second part 61, the positioning block 521 is located between the first connecting block 522 and the second connecting block 523; when the first part 31 separates from the second part 61, the end of the air duct 1 corresponding to the air outlet abuts against the inner wall of the insertion groove 524.

[0045] It should be noted that in the wind-gathering state, the outer jacket 6 is connected to the air duct 1 through the insertion slot 524. The positioning block 521 on the inner wall of the insertion slot 524 is located between the first connecting block 522 and the second connecting block 523 in the receiving slot 525. At this time, the first part 31 and the second part 61 abut against each other, the second air duct 62 is not opened, and the airflow is discharged from the first air duct 32 in the wind-gathering state. When it is necessary to switch to the wind-expanding state, the outer jacket 6 is moved. The outer jacket 6 slides relative to the air duct 1 and the inner sleeve 3. The positioning block 521 moves out from between the first connecting block 522 and the second connecting block 523. The outer jacket 6 continues to move until the inner side wall of the insertion slot 524 on the outer jacket 6 abuts against the end of the corresponding air outlet of the air duct 1. At this time, the first part 31 and the second part 61 are completely separated and the second air duct 62 is formed. The airflow will also pass through the second air duct 62 when passing through the first air duct 32, thereby being diffused to achieve wind expansion.

[0046] It should also be noted that when the outer jacket 6 is reset and slids along the air duct 1, the positioning block 521 will slide back into the receiving groove 525 and move to the position between the first connecting block 522 and the second connecting block 523 to complete the limiting. At this time, the first part 31 and the second part 61 will re-abut each other and restore the air gathering state.

[0047] It is understood that the inner sleeve 3 achieves a firm connection with the air duct 1 through the cooperation of the second snap-fit ​​part 422 and the snap-fit ​​block 424, and the insertion of the assembly block 426 into the gap 425 between the second elastic part 421 and the inner side wall of the second groove 423. It remains stationary during adjustment and has high stability. In addition, the switching between the air-gathering state and the air-expanding state can be achieved by pushing and pulling the outer sleeve 6. The operation steps are convenient and simple. Through the cooperation of the positioning block 521, the first connecting block 522 and the second connecting block 523, the accuracy of the air-gathering state and the air-expanding state can be ensured.

[0048] It is worth noting that the second elastic part 421, the positioning block 521, the first connecting block 522 and the second connecting block 523 are all made of elastic plastic materials. During the switching process between the air gathering state and the air expanding state, the above components ensure the switching process through their own elasticity. At the same time, the specific plastic materials of the above components are well known to those skilled in the art, and will not be described in this embodiment.

[0049] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A fan with a variable air duct, comprising an air duct (1), characterized in that, The air outlet of the air duct (1) is provided with a telescopic component (2). The telescopic component (2) includes an inner sleeve (3) and an outer sleeve (6) that are inserted into each other. A first air duct (32) is formed inside the inner sleeve (3). A first part (31) that is inclined outward is formed at the air outlet of the inner sleeve (3). A second part (61) that is inclined outward is formed at the air outlet of the outer sleeve (6). The relative positions of the inner sleeve (3) and the outer sleeve (6) are adjusted so that the first part (31) and the second part (61) abut or separate. The first part (31) and the second part (61) are separated so that a second air duct (62) is formed between them, and the second air duct (62) is inclined outward.

2. The fan with a variable air duct according to claim 1, characterized in that, The telescopic component (2) is connected to the air duct (1) via the snap-fit ​​unit (4), and the inner sleeve (3) is connected to the outer sleeve (6) via the limiting unit (5).

3. The fan with a variable air duct according to claim 2, characterized in that, The snap-fit ​​unit (4) is disposed on the outer casing (6). The snap-fit ​​unit (4) includes a first elastic part (411) and a first snap-fit ​​part (412). The outer casing (6) has a first groove (413) at the end near the air duct (1). The first elastic part (411) is disposed on the side wall of the first groove (413) near the air duct (1). The first snap-fit ​​part (412) is disposed on the outer periphery of the first elastic part (411), and the side of the first snap-fit ​​part (412) near the air duct (1) is set as an inclined surface. A first snap-fit ​​groove (414) is disposed on the inner wall of the air duct (1) at the position corresponding to the first snap-fit ​​part (412). The first snap-fit ​​part (412) snaps into the first snap-fit ​​groove (414), so that the outer casing (6) is connected to the air duct (1).

4. The fan with a variable air duct according to claim 3, characterized in that, The outer casing (6) is provided with a guide strip (415) along its axial direction, and the inner wall of the air duct (1) is provided with an outlet groove corresponding to the position of the guide strip (415), and the guide strip (415) is connected to the guide groove (416).

5. The fan with a variable air duct according to claim 3, characterized in that, The limiting unit (5) includes a limiting seat (511) and a limiting block (515). The limiting seat (511) is disposed on the inner wall of the outer sleeve (6) along the axis of the outer sleeve (6), and the limiting block (515) is disposed on the outer periphery of the inner sleeve (3) corresponding to the position of the limiting seat (511). The limiting seat (511) is a groove structure missing on the side facing the inner sleeve (3). The limiting seat (511) has a first limiting block (512), a second limiting block (513) and a blocking block (514) formed sequentially in the direction of the inner sleeve (3). The first limiting block (512) and the second limiting block (513) are both set as inclined surfaces on both sides along the distribution direction. The blocking block (514) is set as an inclined surface on the side facing the inner sleeve (3). The limiting block (515) has a protrusion (516) on the side away from the inner sleeve (3), and both sides of the protrusion (516) along the distribution direction of the limiting block (515) are set as inclined surfaces. The limiting block (515) is slidably connected in the limiting seat (511). When the first part (31) abuts against the second part (61), the protrusion (516) is located between the inner wall of the first limiting block (512) and the limiting seat (511); when the first part (31) and the second part (61) separate, the protrusion (516) is located between the blocking block (514) and the second limiting block (513).

6. The fan with a variable air duct according to claim 2, characterized in that, The snap-fit ​​unit (4) is disposed on the inner sleeve (3). The snap-fit ​​unit (4) includes a second elastic part (421) and a second snap-fit ​​part (422). The inner sleeve (3) is provided with a second groove (423) at the end near the air duct (1). The second elastic part (421) is disposed on the side wall of the second groove (423) near the air duct (1). The second snap-fit ​​part (422) is disposed on the outer periphery of the second elastic part (421). The side of the second snap-fit ​​part (422) near the air duct (1) is set as an inclined surface. A snap-fit ​​block (424) is disposed on the inner wall of the air duct (1) along its axial direction. The side of the snap-fit ​​block (424) facing the inner sleeve (3) is set as an inclined surface. The second snap-fit ​​part (422) and the side of the snap-fit ​​block (424) away from the inner sleeve (3) abut against each other, so that the inner sleeve (3) is connected to the air duct (1).

7. The fan with a variable air duct according to claim 6, characterized in that, A gap (425) is formed between the second elastic part (421) and the inner wall of the second groove (423). An assembly block (426) is provided on the inner wall of the air duct (1) along its axial direction, and the side of the assembly block (426) away from the air duct (1) extends into the gap (425). The assembly block (426) is inserted between the second elastic part (421) and the inner wall of the second groove (423).

8. The fan with a variable air duct according to claim 6, characterized in that, The inner wall of the outer jacket (6) is provided with a insertion groove (524), and the outer jacket (6) is connected to the air duct (1) through the insertion groove (524). The limiting unit (5) includes a positioning block (521) and a first connecting block (522) and a second connecting block (523) arranged sequentially in the direction of the outer jacket (6). The positioning block (521) is disposed on the inner peripheral wall of the insertion groove (524). The outer periphery of the air duct (1) is provided with a receiving groove (525) corresponding to the position of the positioning block (521) facing the positioning block (521). The first connecting block (522) and the second connecting block (523) are disposed in the receiving groove (525). When the first part (31) abuts against the second part (61), the positioning block (521) is located between the first connecting block (522) and the second connecting block (523); when the first part (31) and the second part (61) separate, the end of the air duct (1) corresponding to the air outlet abuts against the inner wall of the insertion groove (524).

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