Handheld bladeless fan

Abstract

The utility model discloses a handheld bladeless fan which comprises a barrel, a fan, a power module, a control module and an air guide barrel. The fan, the power module, the control module and the air guide barrel are sequentially arranged in the barrel from bottom to top. A first air inlet is formed in the lower end of the barrel, and an air inlet channel is formed among the outer side of the control module, the outer side of the power module and the side wall of the barrel; an air outlet is formed in the front side of the upper end of the barrel; the front side of the air guide barrel is connected with the air outlet; a flow guide body is arranged on the rear side of the upper end of the barrel body, the flow guide body is provided with a first annular flow guide cambered surface formed on the outer wall surface of the barrel body and a second annular flow guide cambered surface formed on the inner wall surface of the barrel body, and a second air inlet communicated with the air guide barrel is defined by the first annular flow guide cambered surface; the second annular flow guide cambered surface and the rear end of the air guide barrel are arranged in a spaced mode, and a confluence opening communicating with the air inlet channel and the air guide barrel is formed. By the adoption of the electric fan, wind power is strong, blown wind is more stable and natural, and meanwhile the safety problem caused by the fact that hair of a user is rolled into the fan blades can be avoided.

Description

Technical Field

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

[0002] A handheld fan is a portable, small fan commonly used in outdoor activities (such as picnics, hiking, camping, etc.) to provide a cool breeze to combat high temperatures and improve comfort. However, traditional handheld fans work by cutting through the air with blades, resulting in an unnatural, uneven, and weak breeze. Moreover, because the blades are exposed, the user's hair can easily get caught in them, posing a safety hazard. Utility Model Content

[0003] The purpose of this invention is to provide a handheld bladeless fan that has a stronger airflow and produces a more stable and natural breeze, while also avoiding safety issues such as the user's hair getting caught in the fan blades.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A handheld bladeless fan includes a cylinder and a fan, a power module, a control module, and an air guide tube arranged sequentially from bottom to top inside the cylinder. The control module is electrically connected to the power module and the fan.

[0006] The lower end of the cylinder is provided with a first air inlet, and an air inlet channel is formed between the outer side of the control module, the outer side of the power module and the side wall of the cylinder, and the air inlet channel is connected to the air outlet of the fan; the upper front end of the cylinder is provided with an air outlet, and the axis of the air outlet is perpendicular to the axis of the cylinder; the front side of the air guide tube is connected to the air outlet.

[0007] The upper rear side of the cylinder is provided with a guide body. The guide body has a first annular guide arc surface formed on the outer wall surface of the cylinder and a second annular guide arc surface formed on the inner wall surface of the cylinder. The first annular guide arc surface surrounds and forms a second air inlet, which is connected to the air guide tube. The diameter of the opening formed by the first annular guide arc surface gradually decreases from the rear side of the cylinder to the front side of the cylinder, and the outer diameter of the second annular guide arc surface gradually decreases from the rear side of the cylinder to the front side of the cylinder. The second annular guide arc surface is spaced apart from the rear end of the air guide tube and forms a confluence port with the air inlet channel and the air guide tube. The wind energy generated by the fan enters the air guide tube sequentially through the air inlet channel and the confluence port.

[0008] As a preferred embodiment of the present invention, the air guide duct includes a contraction section and an expansion section, with a smooth transition between the contraction section and the expansion section. The inner diameter of the contraction section gradually decreases from the rear side of the duct to the front side of the duct, and the inner diameter of the expansion section gradually increases from the rear side of the duct to the front side of the duct.

[0009] As a preferred embodiment of this utility model, the length of the contraction section is less than the length of the expansion section.

[0010] As a preferred embodiment of this utility model, the second annular guide surface is provided with a plurality of guide vanes evenly distributed along the circumferential direction, and the guide vanes are disposed inside the confluence port.

[0011] As a preferred embodiment of this utility model, the front side of the air guide duct is detachably connected to the front side of the cylinder body via a snap fastener.

[0012] As a preferred embodiment of this utility model, it further includes a protective shell, which is disposed inside the cylinder. The fan, the control module, and the power module are all disposed inside the protective shell. The air inlet channel is formed between the outside of the control module, the outside of the power module, and the side wall of the protective shell.

[0013] As a preferred embodiment of this utility model, the outer wall of the cylinder is provided with a display screen and a charging interface, and the control module is electrically connected to the display screen and the charging interface respectively.

[0014] As a preferred embodiment of this utility model, the fan is a turbine straight-cylinder high-speed fan.

[0015] As a preferred embodiment of this utility model, an air inlet screen is connected to the first air inlet to prevent debris from entering the cylinder, and the air inlet screen has multiple air inlet holes evenly distributed on it.

[0016] As a preferred embodiment of this utility model, a switch button is provided on the outer wall of the cylinder, and the switch button is electrically connected to the control module.

[0017] The handheld bladeless fan provided by this utility model has the following advantages compared with the prior art:

[0018] (1) The handheld bladeless fan of this utility model uses a fan as the source of wind power and hides the fan inside the cylinder. Compared with the traditional fan blade exposed structure, it can avoid safety problems such as the user's hair being caught in the fan blade.

[0019] (2) The handheld bladeless fan of this utility model has two air inlets (i.e., the first air inlet is set at the lower end of the cylinder and the second air inlet is formed by the first annular guide arc surface in the guide fluid set at the upper rear side of the cylinder). Since the confluence port is a narrow channel formed by the second annular guide arc surface and the rear end of the guide tube, when the air generated by the fan enters the guide tube through the confluence port, the airflow velocity increases, so that a lower low pressure is formed at the junction of the confluence port and the guide tube, thereby attracting more air from the second air inlet into the guide tube and finally blowing it out from the air outlet, ultimately forming a multiplied and uninterrupted airflow with stronger wind force. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0021] Figure 1 This is a schematic diagram of a handheld bladeless fan provided in an embodiment of the present invention from a downward view.

[0022] Figure 2 It is at Figure 1 An enlarged view of region A in the structure shown;

[0023] Figure 3 This is a schematic diagram of the structure of a handheld bladeless fan provided in another view according to an embodiment of the present invention;

[0024] Figure 4 This is an exploded view of a handheld bladeless fan provided in an embodiment of this utility model;

[0025] Figure 5 This is one of the cross-sectional views of a handheld bladeless fan provided in an embodiment of this utility model;

[0026] Figure 6 This is a second cross-sectional view of a handheld bladeless fan provided in an embodiment of this utility model;

[0027] Figure 7 This is a bottom view of a handheld bladeless fan provided in an embodiment of this utility model;

[0028] Figure 8 This is a schematic diagram of the air duct structure.

[0029] Marked in the image:

[0030] 1. Cylinder body; 2. Fan; 3. Power module; 4. Control module; 5. Air guide tube; 51. Contraction section; 52. Expansion section; 6. First air inlet; 7. Air inlet channel; 8. Air outlet; 9. Guide tube; 91. First annular guide arc surface; 92. Second annular guide arc surface; 10. Second air inlet; 11. Combination port; 12. Guide vane; 13. Buckle; 14. Protective shell; 15. Display screen; 16. Air inlet mesh cover; 161. Air inlet hole; 17. Switch button; 18. Charging interface. Detailed Implementation

[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0032] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. It should also be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0033] Please see Figures 1 to 8 A preferred embodiment of this utility model provides a handheld bladeless fan, which includes a cylinder 1 and a fan 2, a power module 3, a control module 4 and an air guide 5 arranged sequentially from bottom to top inside the cylinder 1. The control module 4 is electrically connected to the power module 3 and the fan 2 respectively.

[0034] like Figures 5 to 7 As shown, the lower end of the cylinder 1 is provided with a first air inlet 6, and an air inlet channel 7 is formed between the outer side of the control module 4, the outer side of the power module 3 and the side wall of the cylinder 1. The air inlet channel 7 is connected to the air outlet of the fan 2. An air outlet 8 is provided on the front side of the upper end of the cylinder 1, and the axis of the air outlet 8 is perpendicular to the axis of the cylinder 1. The front side of the air guide duct 5 is connected to the air outlet 8.

[0035] like Figures 1 to 6 , Figure 8As shown, a guide body 9 is provided on the rear side of the upper end of the cylinder 1. The guide body 9 has a first annular guide arc surface 91 formed on the outer wall surface of the cylinder 1 and a second annular guide arc surface 92 formed on the inner wall surface of the cylinder 1. The first annular guide arc surface 91 surrounds and forms a second air inlet 10, which is connected to the air guide tube 5. The diameter of the opening formed by the first annular guide arc surface 91 gradually decreases from the rear side of the cylinder 1 to the front side of the cylinder 1, and the outer diameter of the second annular guide arc surface 92 gradually decreases from the rear side of the cylinder 1 to the front side of the cylinder 1. The second annular guide arc surface 92 is spaced apart from the rear end of the air guide tube 5 and forms a confluence port 11 with the air inlet channel 7 and the air guide tube 5. The wind energy generated by the fan 2 enters the air guide tube 5 through the air inlet channel 7 and the confluence port 11 in sequence.

[0036] According to the present invention, the handheld bladeless fan uses a fan 2 as the source of airflow and hides the fan 2 inside the cylinder 1. Compared with the traditional fan blade structure with exposed blades, this avoids safety issues such as the user's hair being caught in the blades. In addition, the handheld bladeless fan of this embodiment has two air inlets (i.e., a first air inlet 6 located at the lower end of the cylinder 1 and a second air inlet 10 formed by the first annular guide arc surface 91 in the guide fluid 9 located on the upper rear side of the cylinder 1). Since the confluence port 11 is a narrow channel formed by the second annular guide arc surface 92 and the rear end of the air guide tube 5, the airflow velocity increases when the air generated by the fan 2 enters the air guide tube 5 through the confluence port 11. This results in a lower pressure at the junction of the confluence port 11 and the air guide tube 5, thereby attracting more air from the second air inlet 10 into the air guide tube 5 and finally blowing it out from the air outlet 8, ultimately forming a multiplied and uninterrupted airflow with stronger airflow.

[0037] For example, such as Figure 6 and Figure 8 As shown, the air guide duct 5 includes a contraction section 51 and an expansion section 52, with a smooth transition between the contraction section 51 and the expansion section 52. The inner diameter of the contraction section 51 gradually decreases from the rear side of the duct body 1 to the front side, while the inner diameter of the expansion section 52 gradually increases from the rear side of the duct body 1 to the front side. Therefore, based on the principles of fluid mechanics, the design of the contraction section 51 and the expansion section 52 helps to accelerate and decelerate the airflow, as well as reduce turbulence and noise. Simultaneously, it also reduces energy loss during airflow, making the airflow more concentrated, resulting in a smoother and more natural breeze, and higher comfort. In this embodiment, the length of the contraction section 51 is less than the length of the expansion section 52. In practical applications, the length of the contraction section 51 is determined by the length of the first annular guide arc surface 91.

[0038] For example, such as Figures 1 to 2 , Figure 4 and Figure 6 As shown, the second annular guide surface 92 is provided with a plurality of guide vanes 12 evenly distributed along the circumference, and the guide vanes 12 are disposed inside the confluence port 11. This design can guide the air energy generated by the fan 2 through the air inlet channel 7 and the confluence port 11 into the air guide tube 5, and finally blow it out from the air outlet 8, thereby improving the efficiency and effect of air flow.

[0039] For example, such as Figure 5 and Figure 8 As shown, the front side of the air guide duct 5 is detachably connected to the front side of the cylinder body 1 via a buckle 13, which makes assembly convenient and connection reliable.

[0040] For example, such as Figures 4 to 6 As shown, the handheld bladeless fan of this invention also includes a protective shell 14, which is disposed inside the cylindrical body 1. The fan 2, the control module 4, and the power module 3 are all disposed inside the protective shell 14. The air inlet channel 7 is formed between the outer side of the control module 4, the outer side of the power module 3, and the side wall of the protective shell 14. Therefore, the protective shell 14 prevents dust and moisture from entering the fan 2, the power module 3, and the control module 4, thereby extending the service life of the handheld bladeless fan.

[0041] For example, the fan 2 is preferably a turbine straight-tube high-speed fan 2, which has the advantages of compact structure and light weight, and is easy to install and maintain.

[0042] For example, such as Figure 7 As shown, an air inlet screen 16 is connected to the first air inlet 6 to prevent debris from entering the cylinder 1. The air inlet screen 16 has multiple air inlet holes 161 evenly distributed on it. This design can prevent external debris from entering the first air inlet 6 and entering the interior of the cylinder 1, thereby affecting the operation of the handheld bladeless fan.

[0043] For example, such as Figure 1 and Figure 4 As shown, a switch button 17 for controlling the start or stop of the handheld bladeless fan is provided on the outer wall of the cylinder 1; the switch button 17 is electrically connected to the control module 4; as shown Figure 1 , Figure 3 and Figure 4 As shown, the outer wall of the cylinder 1 is provided with a display screen 15 and a charging interface 18. The control module 4 is electrically connected to the display screen 15 and the charging interface 18 respectively. Thus, the display screen 15 can display the power level in the power module 3; when the power level in the power module 3 is depleted, it can be charged through the charging interface 18.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A handheld bladeless fan, characterized in that, It includes a cylinder body and, from bottom to top, a fan, a power module, a control module, and an air guide tube arranged inside the cylinder body. The control module is electrically connected to the power module and the fan respectively. The lower end of the cylinder is provided with a first air inlet, and an air inlet channel is formed between the outer side of the control module, the outer side of the power module and the side wall of the cylinder, and the air inlet channel is connected to the air outlet of the fan; the upper front end of the cylinder is provided with an air outlet, and the axis of the air outlet is perpendicular to the axis of the cylinder; the front side of the air guide tube is connected to the air outlet. The upper rear side of the cylinder is provided with a guide body. The guide body has a first annular guide arc surface formed on the outer wall surface of the cylinder and a second annular guide arc surface formed on the inner wall surface of the cylinder. The first annular guide arc surface surrounds and forms a second air inlet, which is connected to the air guide tube. The diameter of the opening formed by the first annular guide arc surface gradually decreases from the rear side of the cylinder to the front side of the cylinder, and the outer diameter of the second annular guide arc surface gradually decreases from the rear side of the cylinder to the front side of the cylinder. The second annular guide arc surface is spaced apart from the rear end of the air guide tube and forms a confluence port with the air inlet channel and the air guide tube. The wind energy generated by the fan enters the air guide tube sequentially through the air inlet channel and the confluence port.

2. The handheld bladeless fan according to claim 1, characterized in that, The air guide duct includes a contraction section and an expansion section, with a smooth transition between the contraction section and the expansion section. The inner diameter of the contraction section gradually decreases from the rear side of the duct to the front side of the duct, while the inner diameter of the expansion section gradually increases from the rear side of the duct to the front side of the duct.

3. The handheld bladeless fan according to claim 2, characterized in that, The length of the contraction segment is less than the length of the expansion segment.

4. The handheld bladeless fan according to claim 1, characterized in that, The second annular guide surface is provided with a plurality of guide vanes evenly distributed along the circumferential direction, and the guide vanes are disposed inside the confluence port.

5. The handheld bladeless fan according to claim 1, characterized in that, The front side of the air guide duct is detachably connected to the front side of the cylinder body via a snap fastener.

6. The handheld bladeless fan according to claim 1, characterized in that, It also includes a protective shell, which is disposed inside the cylinder. The fan, the control module and the power module are all disposed inside the protective shell. The air inlet channel is formed between the outside of the control module, the outside of the power module and the side wall of the protective shell.

7. The handheld bladeless fan according to claim 1, characterized in that, The outer wall of the cylinder is provided with a display screen and a charging interface, and the control module is electrically connected to the display screen and the charging interface respectively.

8. The handheld bladeless fan according to claim 1, characterized in that, The fan is a turbine-type straight-tube high-speed fan.

9. The handheld bladeless fan according to claim 1, characterized in that, The first air inlet is connected to an air inlet screen to prevent debris from entering the cylinder, and the air inlet screen has multiple air inlet holes evenly distributed on it.

10. The handheld bladeless fan according to claim 1, characterized in that, A switch button is provided on the outer wall of the cylinder, and the switch button is electrically connected to the control module.

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