Air supply device capable of adjusting pitching angle

Abstract

The utility model discloses an air supply device capable of adjusting a pitching angle. The air supply device comprises a U-shaped bracket with two support arms and a main machine, the shell comprises a front end face serving as an airflow outlet, a rear end face serving as an airflow inlet and a peripheral side portion. The peripheral side part comprises two side surfaces; a concave cavity is formed in the side surface; a connecting seat is arranged in the middle of the concave cavity; the limiting piece comprises an inner protruding piece and a cover plate which are integrated, a groove is formed in the inner protruding piece, and the connecting base is inserted into the groove and connected with the groove through a screw. The inner convex piece falls into the concave cavity; an annular piece is arranged on the supporting arm, and an elastic plug pin is installed in the annular piece. The cover plate is provided with a plurality of gear grooves allowing the elastic plug pins to go in and out, and the cover plate is limited to the outer side of the annular piece. When the host rotates at a pitching angle relative to the U-shaped bracket, the elastic bolt on the support arm can be inserted into any gear groove, so that the host is locked at different pitching angles; and the U-shaped bracket is matched with the elastic bolt, so that the pitching angle of the host can be flexibly adjusted, the overall stability and reliability are enhanced, and the space utilization is optimized.

Description

Technical Field

[0001] This utility model relates to a household air conditioner, and more particularly to a heater with an adjustable tilt angle, which can change the tilt angle of the airflow generating device according to the user's needs, thereby changing the airflow direction. Background Technology

[0002] The folding heater described in CN102913979A includes a main support frame and two or more heating working units equipped with heating elements. One end of each heating working unit is connected to the same rotating shaft, which is mounted on the main support frame and can rotate. One end of one heating working unit is fixedly connected to the rotating shaft, while the other heating working units can rotate relative to the rotating shaft. Adjacent heating working units are connected by a limiting mechanism.

[0003] CN103822286A describes a rotary heater, which includes a heating device and a base. The heating device is rotatably mounted on top of the base via a rotating mechanism. The rotating mechanism includes a rotating disc, a fixed head, a drive motor, a mounting bracket, and a rotating shaft.

[0004] The heater described in CN108571765A includes a bracket and a heater body mounted on the bracket. The heater body includes a main frame and a main panel mounted within the main frame. A rotating shaft is provided between the upper and lower ends of the main panel and the main frame.

[0005] Current heater technologies generally suffer from complex and inflexible angle adjustment functions. For example, the aforementioned heaters employ complex lifting, folding, or rotating mechanisms to adjust angle or position. These structures not only increase production costs and assembly difficulty but also lead to higher maintenance requirements and a greater risk of malfunction. Over long-term use, the fit between multiple mechanical components can easily loosen, wear out, or break, affecting product stability and lifespan, and reducing the user experience. Furthermore, these complex adjustment mechanisms are not convenient to operate in practice, making it difficult for users to quickly and accurately adjust to the desired angle, further impacting product usability and user experience. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an air supply device with an adjustable tilt angle; by simplifying the structural settings, the device utilizes the cooperation of a U-shaped bracket and a flexible pin to achieve flexible adjustment of the main unit's tilt angle, while enhancing overall stability and reliability, optimizing space utilization, reducing wear, thereby improving user experience and reducing maintenance costs.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: an adjustable pitch air supply device, including a base, a U-shaped bracket with two support arms and a main unit; the lower end of the U-shaped bracket is provided with a connecting base, and the connecting base is fixedly connected to the center of the base;

[0008] The main unit includes a housing and an airflow generating assembly inside the housing; the housing includes a front face serving as an airflow outlet, a rear face serving as an airflow inlet, and a peripheral portion;

[0009] The peripheral portion includes two side surfaces; each side surface has a recessed cavity, and a connecting seat is provided in the middle of the recessed cavity;

[0010] A limiting component includes an integral inner protrusion and a cover plate. The inner protrusion has a groove, and the connecting seat is inserted into the groove and connected by screws. The inner protrusion falls into the cavity.

[0011] The arm is provided with a ring-shaped component, and an elastic pin is installed in the ring-shaped component;

[0012] The cover plate is provided with multiple slots for the elastic pin to enter and exit, and the cover plate is restricted to the outside of the annular part;

[0013] When the main unit rotates in a pitch angle relative to the U-shaped bracket, the elastic pin on the support arm can be inserted into the gear slot in any way, thereby locking the main unit in different pitch angle positions.

[0014] A further preferred embodiment of this utility model is as follows: the elastic pin includes a spring and a pin; the annular component is provided with a mounting hole, and the spring and the pin are disposed in the mounting hole.

[0015] A further preferred technical solution of this utility model is: the multiple gear slots are a first gear slot, a second gear slot and a third gear slot distributed in an arc shape, with corresponding pitch angles of 0 degrees, 30 degrees and 60 degrees.

[0016] The first gear slot, the second gear slot, and the third gear slot are arc-shaped concave holes.

[0017] Another subject: an adjustable pitch air supply device, comprising a base, a U-shaped bracket with two support arms, and a main unit; the lower end of the U-shaped bracket is provided with a connecting base, which is fixedly connected to the center of the base;

[0018] The main unit includes a housing and an airflow generating assembly inside the housing; the housing includes a front face serving as an airflow outlet, a rear face serving as an airflow inlet, and a peripheral portion;

[0019] The peripheral portion includes two side surfaces; the side surfaces are fitted with limiting members;

[0020] The support arm is provided with a mounting part, and the mounting part is provided with a resilient pin;

[0021] The limiting member is provided with multiple slots for the elastic pin to enter and exit, and the limiting member is located on the outside of the mounting part;

[0022] When the main unit rotates relative to the U-shaped bracket at different pitch angles, the elastic pin on the support arm can be inserted into the gear slot in any way, thereby locking the main unit at different pitch angle positions.

[0023] A further preferred embodiment of this utility model is: a recessed cavity is provided on the side, and a connecting seat is provided in the middle of the recessed cavity;

[0024] The limiting component includes an integral inner protrusion and a cover plate. The inner protrusion has a groove, and the connecting seat is inserted into the groove and connected by screws; and the inner protrusion falls into the cavity.

[0025] The cover plate is located on the outside of the mounting part.

[0026] A further preferred embodiment of this utility model is that the mounting part is an annular component, and the annular component partially enters the cavity.

[0027] Another technical topic: an adjustable tilt-down air supply device, including a base, a U-shaped bracket with two support arms, and a main unit; the lower end of the U-shaped bracket is provided with a connecting base, which is fixedly connected to the center of the base; the heating main unit includes a housing and an airflow generating component inside the housing; the housing includes a front end face as an airflow outlet, a rear end face as an airflow inlet, and a peripheral side;

[0028] The peripheral side portion includes a first peripheral side portion and a second peripheral side portion; the size of the first peripheral side portion is larger than the size of the second peripheral side portion, so that an annular step is formed between the first peripheral side portion and the second peripheral side portion;

[0029] The second peripheral side includes a second top surface, two second side surfaces, and a second bottom surface;

[0030] The two arms of the U-shaped bracket are rotatably connected to the two second sides of the housing, respectively; the U-shaped bracket rests within the annular step, and the outer periphery of the U-shaped bracket does not extend beyond the first side.

[0031] The support arm is equipped with a resilient pin; a limiting component is installed on the second side.

[0032] The limiting component is provided with multiple gear slots;

[0033] When the main unit rotates in a pitch angle relative to the U-shaped bracket, the elastic pin on the support arm can enter any of the slots of the limiting member, thereby locking the main unit in different pitch angles.

[0034] A further preferred technical solution of this utility model is: the multiple gear slots are a first gear slot, a second gear slot and a third gear slot distributed in an arc shape, with corresponding pitch angles of 0 degrees, 30 degrees and 60 degrees.

[0035] The first gear slot, the second gear slot, and the third gear slot are arc-shaped concave holes.

[0036] A further preferred embodiment of this utility model is: a recessed cavity is provided on the side, and a connecting seat is provided in the middle of the recessed cavity;

[0037] The limiting component includes an integral inner protrusion and a cover plate. The inner protrusion has a groove, and the connecting seat is inserted into the groove and connected by screws. The inner protrusion falls into the cavity.

[0038] The support arm is provided with a ring-shaped component, and the elastic pin is installed on the ring-shaped component.

[0039] The cover plate is confined to the outside of the annular component.

[0040] A further preferred embodiment of this utility model is as follows: the elastic pin includes a spring and a pin; the annular component is provided with a mounting hole, and the spring and the pin are disposed in the mounting hole.

[0041] Compared with existing technologies, the advantages of this utility model are: The adjustable tilt angle air supply device of this utility model achieves a tight connection between the main unit and the U-shaped bracket through a unique structural design. The concave cavity and connecting seat design on the periphery, combined with the inner protrusion of the limiting component and the cover plate, make the connection between the main unit and the bracket more stable. This design not only enhances the stability of the overall structure but also makes the device more compact through reasonable space utilization, reducing the overall volume and facilitating installation and use.

[0042] The device features a clever adjustment mechanism: a ring-shaped component on the support arm is fitted with a flexible pin, and the cover plate has multiple position slots. When the main unit rotates relative to the U-shaped bracket, the flexible pin can precisely insert into any of the position slots, thus locking the main unit at different tilt angles. This design not only provides flexible adjustment but also ensures precise adjustment, allowing users to quickly adjust the airflow direction according to their needs, thus enhancing ease of use and practicality.

[0043] The combination of the flexible pin and the gear slot not only improves the flexibility of adjustment but also enhances the safety and reliability of the device. In the locked state, the flexible pin firmly secures the main unit, preventing angular deviation caused by external forces and ensuring stable airflow direction. Simultaneously, this design reduces direct friction between mechanical parts, lowers wear, extends component lifespan, and reduces maintenance costs. Attached Figure Description

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0045] Figure 1 This is a schematic diagram of the state of the air supply device in this embodiment. Figure 1 ;

[0046] Figure 2 This is a schematic diagram of the state of the air supply device in this embodiment. Figure 2 ;

[0047] Figure 3 This is a schematic diagram of the state of the air supply device in this embodiment. Figure 3 ;

[0048] Figure 4 This is a disassembly diagram of the air supply device in this embodiment. Figure 1 ;

[0049] Figure 5 This is a disassembly diagram of the air supply device in this embodiment. Figure 2 ;

[0050] Figure 6 A schematic diagram of the overall structure of the limiting component and the flexible pin;

[0051] Figure 7 A schematic diagram of the overall structure of the connecting seat inside the cavity;

[0052] Figure 8 This is a schematic diagram of the air supply device in this embodiment. Figure 1 ;

[0053] Figure 9 This is a schematic diagram of the air supply device in this embodiment. Figure 2 ;

[0054] Figure 10 This is an assembly diagram of the limiting component, the ring body, and the connecting seat. Detailed Implementation

[0055] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0056] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0057] like Figures 1 to 3 As shown, this utility model provides an adjustable pitch and tilt air supply device 100, which is ingeniously designed and has a reasonable structure, and can effectively meet the user's needs in different scenarios.

[0058] The device mainly includes a base 101, a U-shaped bracket 102, and a main unit 103. The U-shaped bracket 102 has two support arms, and its lower end is provided with a connecting base 104. The connecting base 104 is fixedly connected to the center of the base 101 to achieve a stable installation, ensuring the stability of the entire device during use.

[0059] The main unit 103 is preferably a heating unit, which integrates a high-efficiency airflow generating component, capable of producing a strong and stable airflow to provide users with a warm and comfortable environment. Through this unique structural design, this invention not only achieves flexible adjustment of the airflow angle but also improves the overall performance of the product and the user experience.

[0060] As the supporting foundation for the entire device, the base 101 is made of high-strength materials, ensuring the stability of the device in various operating environments. Its bottom is designed with anti-slip textures, further enhancing the device's grip on different ground materials, preventing slippage due to external forces, and ensuring safety during use.

[0061] The U-shaped bracket 102 is one of the core components of this utility model. Its unique U-shaped structure not only provides sufficient support strength but also allows for flexible adjustment of the air supply unit. The two arms of the bracket are connected to the two sides of the main unit 103, respectively. Through ingenious mechanical design, the main unit 103 can be smoothly switched between different tilt angles. The lower end of the U-shaped bracket 102 is provided with a connecting base 104, which is fixedly connected to the center of the base 101 by high-strength bolts or welding, ensuring a firm connection between the bracket and the base and providing a solid guarantee for the stability of the entire device.

[0062] The main unit 103 is a key component of this invention, integrating an advanced airflow generating assembly capable of producing a strong and stable airflow. The main unit 103 is preferably a heating unit, with its outer casing made of high-quality materials, offering excellent heat dissipation and durability. The front end face 11 of the main unit 103 serves as the airflow outlet, the rear end face 12 as the airflow inlet, and the peripheral side 13 is divided into a first peripheral side 131 and a second peripheral side 132 according to functional requirements.

[0063] The first side portion 131 is larger than the second side portion 132, forming an annular step 133 between them. This unique technique not only enhances the structural stability of the main unit but also facilitates the installation of the U-shaped bracket 102. The two second side surfaces s2 of the second side portion 132 are rotatably connected to the two arms 20 of the U-shaped bracket 102, allowing the main unit 103 to achieve flexible tilt angle adjustment under the support of the U-shaped bracket 102.

[0064] The heating unit 103 includes a housing 10 and an airflow generating component inside the housing 10; the housing 10 includes a front end face 11 serving as an airflow outlet, a rear end face 12 serving as an airflow inlet, and a peripheral side portion 13;

[0065] It should be noted that the design of the annular step 133 allows the connection points of the U-shaped bracket 102 (such as the rotational connection point between the support arm 20 and the second side s2) to be concealed within the step. This technique not only makes the connection points less susceptible to direct external force, reducing the risk of damage due to collisions or accidental contact, but also enhances the overall aesthetics of the product. The larger size of the first annular side 131 effectively shields the connection points, further protecting them from external interference. This shielding effect not only improves product safety but also reduces the possibility of dust and debris entering the connection points.

[0066] This layered technology allows for more efficient use of the internal space of the main unit 103. The dimensional difference between the first side 131 and the second side 132 makes the structure of the main unit 103 more compact, reducing its overall volume and facilitating installation and use. The two arms 20 of the U-shaped bracket 102 are rotatably connected to the two second sides s2 of the housing 10, respectively. This design not only ensures the stable support of the main unit 103 on the U-shaped bracket 102, but also enables flexible tilt angle adjustment.

[0067] In addition, the U-shaped bracket 102 rests within the annular step 133, and its outer periphery does not extend beyond the first side s1. This not only enhances the structural stability of the entire device but also ensures a tight fit between the U-shaped bracket 102 and the main unit 103, reducing swaying or tilting caused by external forces, and further improving the reliability and service life of the product.

[0068] In the adjustable pitch air supply device 100 of this utility model, such as Figures 4 to 10As shown, the support arm 20 is equipped with a resilient pin 40, while the second side s1 is fitted with a limiting member 30. The limiting member 30 has multiple position slots p, which are arc-shaped and specifically include a first position slot, a second position slot, and a third position slot, preferably corresponding to pitch angles of 0 degrees, 30 degrees, and 60 degrees, respectively. When the main unit 103 rotates relative to the U-shaped bracket 102 in a pitch angle, the resilient pin 40 on the support arm 20 can precisely enter any position slot p of the limiting member 30, thereby firmly locking the main unit 103 at the selected pitch angle position.

[0069] This locking mechanism not only ensures stable fixation of the main unit 103 at different tilt angles but also guarantees the convenience and accuracy of the adjustment process. Users can easily adjust the airflow direction of the main unit 103 according to their actual needs, whether it's upward, horizontal, or downward airflow, all through simple operation. The cooperation between the elastic pin 40 and the limiting member 30 provides reliable locking force, preventing angular displacement of the main unit 103 due to external forces and ensuring the stability of the airflow direction.

[0070] Furthermore, this technology enhances the overall performance and user experience of the product. With its rationally distributed speed settings, users can quickly find the desired airflow angle without complex adjustments. Simultaneously, the flexible latch 40 design increases adjustment flexibility, allowing the main unit 103 to easily switch between different angles, meeting user needs in various scenarios.

[0071] More specifically, in the adjustable tilt-angle air supply device 100 of this utility model, a cavity r is provided on the second side s2, and a connecting seat r1 is provided in the middle of the cavity r. The support arm 20 is provided with a mounting part, which is an annular member 21, and the annular member 21 partially enters the cavity r. This design not only provides a stable support for the connection between the support arm 20 and the main unit 103, but also achieves a flexible rotational connection through the cooperation between the annular member 21 and the cavity r.

[0072] The limiting member 30 includes an integral inner protrusion 31 and a cover plate 32. The inner protrusion 31 has a groove 33, and the connecting seat r1 is inserted into the groove 33 and connected by a screw t. The inner protrusion 31 falls into the cavity r. This structural design makes the connection between the limiting member 30 and the main unit 103 tighter, while providing a stable installation position for the elastic pin 40. The elastic pin 40 is mounted on the annular member 21, and the cover plate 32 restricts it to the outside of the annular member 21. This design not only protects the elastic pin 40 from external interference, but also ensures its stability and reliability during the adjustment process.

[0073] Preferably, in the adjustable tilt angle air supply device 100 of this utility model, the design of the elastic pin 40 plays a key role. The elastic pin 40 consists of a spring 41 and a pin 42. The annular part 21 is provided with a mounting hole 22, in which the spring 41 and the pin 42 are precisely installed. This design not only ensures the stability and reliability of the elastic pin 40 during operation, but also realizes the quick locking and unlocking function of the pin 42 through the elastic deformation of the spring 41.

[0074] Multiple gear slots p are arranged in an arc shape, specifically including a first gear slot, a second gear slot, and a third gear slot, corresponding to pitch angles of 0 degrees, 30 degrees, and 60 degrees, respectively. These gear slots p are designed as arc-shaped concave holes, matching the shape of the elastic pin 40, ensuring precise locking at different angles. When the main unit 103 rotates relative to the U-shaped bracket 102 in a pitch angle, the elastic pin 40 on the support arm 20 can precisely enter any gear slot p of the limiting member 30, thereby firmly locking the main unit 103 at the selected pitch angle position.

[0075] With the cooperation of the flexible pin 40 and the arc-shaped gear slots p, users can easily adjust the airflow direction of the main unit 103, whether it is upward, horizontal, or downward airflow, all of which can be achieved through simple operation. At the same time, the spring 41 of the flexible pin 40 provides reliable elastic support during locking and unlocking, ensuring smooth and stable operation.

[0076] It should be noted that the arc-shaped concave hole can effectively optimize stress distribution and reduce stress concentration points. This design makes the stress distribution more uniform when the elastic pin 40 is inserted into and pulled out of the stop slot p, thereby improving the overall strength and reliability of the component.

[0077] The shape of the arc-shaped concave hole matches the pin 42 of the resilient pin 40, reducing direct friction between the pin 42 and the gear slot p. By optimizing the stress distribution on the contact surface, the arc-shaped concave hole design not only reduces wear but also extends the service life of the component. Moreover, the distribution and shape design of the arc-shaped concave hole allow the resilient pin 40 to accurately enter the gear slot p.

[0078] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They 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. Therefore, they should not be construed as limitations on this utility model. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and cannot be considered as limitations on this utility model.

[0079] This invention provides a soft patellar strap. Specific examples are used to illustrate the principle and implementation of this invention. The descriptions of the embodiments are merely for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. The adjustable air supply device of pitch angle, characterized in that: comprising a base, a U-shaped support with two arms and a main machine; the lower end of the U-shaped support is provided with a connecting base, and the connecting base is fixedly connected with the center of the base; the main machine comprises a shell and an airflow generating assembly in the shell; the shell comprises a front end face as an airflow outlet, a rear end face as an airflow inlet and a peripheral side; the peripheral side comprises two side faces; the side face is provided with a recess, and the middle of the recess is provided with a connecting seat; a limiting piece comprises an integral inner protrusion and a cover plate, the inner protrusion is provided with a groove, the connecting seat is inserted into the groove and connected by a screw; and the inner protrusion falls into the recess; the arm is provided with a ring-shaped piece, and the ring-shaped piece is provided with an elastic latch; the cover plate is provided with a plurality of gear slots for the elastic latch to enter and exit, and the cover plate is limited outside the ring-shaped piece; when the main machine rotates relative to the U-shaped support, the elastic latch on the arm can be inserted into any gear slot, thereby locking the main machine at different pitch angle positions.

2. The adjustable air supply device of pitch angle according to claim 1, characterized in that: the elastic latch comprises a spring and a latch; the ring-shaped piece is provided with a mounting hole, and the spring and the latch are arranged in the mounting hole.

3. The adjustable air supply device of pitch angle according to claim 1, characterized in that: a plurality of gear slots are arc-shaped first, second and third gear slots, and the corresponding pitch angles are 0 degrees, 30 degrees and 60 degrees; the first, second and third gear slots are arc-shaped recesses.

4. The adjustable air supply device of pitch angle, characterized in that: comprising a base, a U-shaped support with two arms and a main machine; the lower end of the U-shaped support is provided with a connecting base, and the connecting base is fixedly connected with the center of the base; the main machine comprises a shell and an airflow generating assembly in the shell; the shell comprises a front end face as an airflow outlet, a rear end face as an airflow inlet and a peripheral side; the peripheral side comprises two side faces; the side face is provided with a recess, and the middle of the recess is provided with a connecting seat; the arm is provided with a mounting portion, and the mounting portion is provided with an elastic latch; the limiting piece is provided with a plurality of gear slots for the elastic latch to enter and exit, and the limiting piece is located outside the mounting portion; when the main machine rotates relative to the U-shaped support, the elastic latch on the arm can be inserted into any gear slot, thereby locking the main machine at different pitch angle positions.

5. The adjustable air supply device of pitch angle according to claim 4, characterized in that: the side face is provided with a recess, and the middle of the recess is provided with a connecting seat; the limiting piece comprises an integral inner protrusion and a cover plate, the inner protrusion is provided with a groove, the connecting seat is inserted into the groove and connected by a screw; and the inner protrusion falls into the recess; the cover plate is located outside the mounting portion. the mounting portion is a ring-shaped piece, and the ring-shaped piece partially enters the recess.

6. The adjustable tilt angle air supply device according to claim 5, wherein:

7. The adjustable air supply device of pitch angle, characterized in that: ​ The adjustable air supply device comprises a base, a U-shaped support with two arms and a main machine; the lower end of the U-shaped support is provided with a connecting base which is fixedly connected with the center of the base; The main machine comprises a shell and an airflow generating assembly in the shell; the shell comprises a front end face as an airflow outlet, a rear end face as an airflow inlet and a peripheral side; The peripheral side comprises a first peripheral side and a second peripheral side; the size of the first peripheral side is larger than that of the second peripheral side, so that an annular step is formed between the first peripheral side and the second peripheral side; The second peripheral side comprises a second top face, two second side faces and a second bottom face; The two arms of the U-shaped support are rotatably connected with the two second side faces of the shell respectively; the U-shaped support falls in the annular step, and the outer periphery of the U-shaped support does not exceed the first side face; The arm is provided with an elastic latch; the second side face is provided with a limiting member; The limiting member is provided with a plurality of gear slots; When the main machine is rotated relative to the U-shaped support, the elastic latch on the arm can enter any gear slot of the limiting member, so as to lock the main machine at different tilt angles.

8. The adjustable tilt angle air supply device according to claim 7, wherein: The plurality of gear slots are arc-shaped first, second and third gear slots, and the corresponding tilt angles are 0°, 30° and 60°; The first, second and third gear slots are arc-shaped recesses.

9. The adjustable tilt angle air supply device according to claim 7, wherein: The side face is provided with a recess, and the middle of the recess is provided with a connecting seat; The limiting member comprises an integral inner protruding member and a cover plate, the inner protruding member is provided with a recess, the connecting seat is inserted into the recess and connected by a screw, and the inner protruding member falls into the recess; The arm is provided with a ring-shaped member, the elastic latch is mounted on the ring-shaped member, and the cover plate is limited on the outside of the ring-shaped member.

10. The adjustable tilt angle air supply device according to claim 9, wherein: The elastic latch comprises a spring and a latch; the ring-shaped member is provided with a mounting hole, and the spring and the latch are arranged in the mounting hole.

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