Hand fan

Abstract

A hand-held fan, characterized in that it comprises: a housing (1); wherein the housing (1) has a handle area (11); inside the housing (1) a wind tunnel part (12) is arranged, and in the wind tunnel part (12) a motor (2) is arranged.

Description

Technical field

[0001] The present application relates to the technical field of fans and in particular to a handheld fan. State of the art

[0002] Currently, a type of handheld fan is available on the market that operates at a high rotational speed and can therefore generate a high airflow. In the industry, it is commonly referred to as a "high-speed fan" or "high-rotation fan." This type of handheld fan is frequently used for situations such as quickly cleaning and blowing away dust, rapid cooling through airflow, or fast drying. However, in the current state of the art, this type of handheld fan consists of only a single circuit board electrically connected to the motor. Due to the high motor speed, significant heat is generated on the circuit board, causing problems such as a reduced lifespan for the handheld fan. Therefore, the question of how to achieve effective heat dissipation has always been a challenging one for such products. Content of the present application

[0003] To overcome the shortcomings of the prior art, the present application offers a handheld fan.

[0004] The technical solution by which the present application solves its technical problem is as follows.

[0005] The present application provides for a hand-held fan comprising a housing, wherein the housing has a handle area; a wind tunnel section is arranged inside the housing, and a motor is arranged in the wind tunnel section; wherein a motor circuit board is arranged on the motor, and the motor circuit board is electrically connected to the motor; furthermore, a control circuit board and a battery are arranged inside the housing, the control circuit board is electrically connected to the motor circuit board, and the control circuit board is further electrically connected to the battery.

[0006] In some embodiments, both the control circuit board and the battery are located in the handle area.

[0007] In some embodiments, the wind tunnel part is arranged horizontally, the handle area is arranged vertically, and the handle area is attached to the bottom of the wind tunnel part to form the housing with a T-shaped structure.

[0008] In some embodiments, a first end of the wind tunnel part is an outlet and a second end of the wind tunnel part is an inlet, so that the wind tunnel part forms a convection structure in which the outlet and the inlet are opposite each other.

[0009] In some embodiments, both the outlet and the inlet are provided with a protective grille.

[0010] In some embodiments, the hand fan further comprises a first connecting line, wherein a feedthrough opening is defined at the connection point between the wind tunnel part and the handle area; a first end of the first connecting line is electrically connected to the control circuit board and a second end of the first connecting line passes through the feedthrough opening and is electrically connected to the motor circuit board in order to realize the electrical connection between the control circuit board and the motor circuit board.

[0011] In some embodiments, a second connecting cable is arranged in the handle area; wherein a first end of the second connecting cable is electrically connected to the control circuit board and a second end of the second connecting cable is electrically connected to the battery.

[0012] In some embodiments, a charging port is attached to the control circuit board for charging the battery, and the charging port is exposed on the outside of the handle area.

[0013] In some embodiments, an operating button is attached to the control circuit board, and the operating button is exposed on the outside of the handle area.

[0014] In some embodiments, the motor circuit board is a control circuit board for the motor.

[0015] In some embodiments, the motor circuit board is arranged opposite the center of the motor.

[0016] In some embodiments, the motor has a rotor part arranged in the middle and a stator part surrounding the rotor part; wherein the motor circuit board is arranged opposite the rotor part of the motor and is mounted on the stator part of the motor.

[0017] In some embodiments, the motor circuit board is located at the front of the rotor part of the motor.

[0018] In some embodiments, the motor further comprises a fan wheel, and the fan wheel has a central connecting part and an outer blade part; the fan wheel is attached to the rear of the rotor part of the motor by the central connecting part.

[0019] In some embodiments, the stator part of the motor has a flow channel opposite the blade part of the fan wheel.

[0020] In some embodiments, the stator part of the motor has a mounting frame, the mounting frame is arranged opposite the rotor part of the motor and is located on the front of the rotor part of the motor, and the motor circuit board is attached to the mounting frame.

[0021] In some embodiments, at least three support rods extend forward from the mounting frame, and the motor circuit board is attached to the end parts of the respective support rods.

[0022] In some embodiments, the motor speed is not less than 20000 rpm or the motor power is not less than 35 W.

[0023] In some embodiments, the motor is a three-phase motor.

[0024] In some designs, the handheld fan is a high-speed handheld fan.

[0025] The advantageous effect of the present application is as follows: Due to the structural arrangement described above, the motor circuit board and the control circuit board are separated within the housing of the handheld fan, allowing the heat generated by the circuit boards to be distributed. Furthermore, the motor circuit board is mounted independently on the motor. Since the motor is located in the wind tunnel section, its operation can create a rapid airflow within this section, thus quickly dissipating heat from the motor circuit board. In summary, the handheld fan of the present application achieves effective heat dissipation through heat distribution and rapid airflow, thereby better addressing the problem of insufficient heat dissipation in existing handheld fans and extending the service life of the handheld fan. Brief description of the drawings

[0026] To clarify the technical solutions in the embodiments of the present application, the drawings required in the description of the embodiments are briefly presented below. The drawings in the following description represent only some embodiments of the present application. A person skilled in the art can derive other drawings from these drawings while preserving the inventive contribution.

[0027] The application is further explained below with reference to the drawings and embodiments. Fig. Figure 1 is a schematic diagram of the structure of a handheld fan according to the present application. Fig. Figure 2 is a schematic diagram of the structure of the hand fan according to the present application from a different perspective. Fig. Figure 3 is an exploded view diagram of the hand fan according to the present application. Fig. Figure 4 is an exploded view diagram of the handheld fan according to the present application from a different perspective. Fig. Figure 5 is a cross-sectional view of the handheld fan according to the present application. Fig. Figure 6 is a schematic diagram of the structure of the hand fan according to the present application with a blow-out nozzle. Fig. 7 is an exploded view diagram of Fig. 6. Fig. Figure 8 is a schematic diagram of the electrical connection structure of the various components of the hand fan according to the present application. Fig. Figure 9 is a schematic diagram of the electrical connection structure of the various components of the hand fan according to the present application from a different perspective. Fig. Figure 10 is a schematic diagram of the structure of a motor circuit board and a motor. Fig. Figure 11 is a schematic diagram of the structure of the motor boards and the motor from a different perspective. Fig. Figure 12 is a schematic representation of the projection of the motor circuit boards onto the motor. Detailed description of the embodiments

[0028] With reference to Fig. 1 to Fig. A handheld fan comprises a housing 1. The housing 1 has a handle area 11. Inside the housing 1, a wind tunnel section 12 is arranged. A motor 2 is arranged in the wind tunnel section 12. A motor board 3 is arranged on the motor 2, and the motor board 3 is electrically connected to the motor 2.

[0029] Inside the housing 1 are also arranged a control board 4 and a battery 5. The control board 4 is electrically connected to the motor board 3, and the control board 4 is also electrically connected to the battery 5.

[0030] Due to the structural arrangement described above, the motor board and the control board are separated within the handheld fan's housing, allowing the heat generated by the boards to be dissipated. Furthermore, the motor board is mounted independently on the motor. Since the motor is located within the wind tunnel section, its operation creates a rapid airflow within this section, effectively dissipating heat from the motor board. In summary, the handheld fan of the present application achieves effective heat dissipation through heat distribution and rapid airflow, thus better addressing the problem of insufficient heat dissipation in existing handheld fans and extending their service life.

[0031] Furthermore, motor board 3 can serve as a control board for the motor. If the motor needs to operate at a high speed, it inevitably requires high power, which means that the heat generated in the handheld fan is primarily concentrated in the motor board. Therefore, mounting the motor boards independently on the motor ensures rapid and effective heat dissipation, which is a sensible structural design.

[0032] Both the control board 4 and the battery 5 are located in the handle area 11.

[0033] Furthermore, the wind tunnel section 12 is arranged horizontally, the handle section 11 is arranged vertically, and the handle section 11 is attached to the lower end of the wind tunnel section 12 to form a housing with a T-shaped structure. The structural arrangement described above makes the handheld fan structurally more efficient, which facilitates its use as a handheld blower.

[0034] Furthermore, a first end of the wind tunnel part 12 is an outlet 13, and a second end of the wind tunnel part 12 is an inlet 14, so that the wind tunnel part 12 forms a convection structure in which outlet 13 and inlet 14 are opposite each other, which increases the wind force and ensures the blower effect of the hand fan.

[0035] Furthermore, protective grilles 8 are fitted to both the outlet 13 and the inlet 14 to prevent fingers from accidentally entering the wind tunnel section and coming into contact with the motor, thus preventing accidents. The protective grilles can be attached to the outlet or inlet by threads or be formed as a single unit with the outlet or inlet; this is not specified here. Additionally, a blow-off nozzle 9 can be fitted to the outlet to focus the airflow. The blow-off nozzle can be attached to the outlet magnetically, by threads, or in some other way; this is not specified here.

[0036] The handheld fan further comprises a first connecting cable 6. A feed-through opening 15 is provided at the connection point between the wind tunnel section 12 and the handle area 11. One end of the first connecting cable 6 is electrically connected to the control board 4, and a second end of the first connecting cable 6 runs through the feed-through opening 15 and is electrically connected to the motor board 3 to establish the electrical connection between the control board 4 and the motor board 3. The structure is simple and the design is practical.

[0037] Furthermore, a second connecting cable 7 is arranged in the handle area 11. One end of the second connecting cable 7 is electrically connected to the control board 4, and the other end of the second connecting cable 7 is electrically connected to the battery 5. In the structure described above, the battery can supply power to the motor via the control board and the motor board; the control board can also control the motor board and the motor. The structure is simple and the design is practical.

[0038] Furthermore, a charging port 41 is attached to the control board 4, which serves to charge the battery 5, and the charging port 41 is exposed on the outside of the handle area 11.

[0039] Furthermore, a control button 42 is attached to the control board 4, and the control button 42 is located on the outside of the handle area 11. Control operations on the motor can be carried out via the control button, e.g. as an on / off switch, for setting the fan speed levels, etc.

[0040] The motor board 3 is positioned opposite the center of the motor 2. During motor operation, the airflow usually occurs outside the motor's center. Therefore, positioning the motor board relative to the motor's center does not directly obstruct the airflow, allowing the air to flow quickly around the motor board and thus dissipate heat rapidly. This structural arrangement ensures the fan's airflow, resulting in a sensible and efficient design.

[0041] Furthermore, the motor 2 has a rotor part 21, which is arranged in the middle, and a stator part 22, which surrounds the rotor part 21. The motor circuit board 3 is arranged correspondingly to / opposite the rotor part 21 of the motor and mounted on the stator part 22 of the motor.

[0042] Furthermore, the motor board 3 is located at the front of the rotor part 21 of the motor. In this configuration, the motor board is not connected to the front of the rotor part, but is merely located relative to it at the front of the rotor part 21 of the motor, which has a beneficial effect on the layout of the structure.

[0043] Furthermore, the motor 2 also includes a fan wheel 23. The fan wheel 23 has a central connecting part 231 and an outer blade section 232. The fan wheel 23 is connected to the rear of the rotor part 21 of the motor via the central connecting part 231. When in use, the motor drives the connecting part of the fan wheel via the rotor part, causing the blade section of the fan wheel to rotate and generate an airflow. In this configuration, the airflow usually occurs at the position corresponding to the blade section, i.e., outside the center of the motor.

[0044] Furthermore, the stator part 22 of the motor has a flow channel 221, corresponding to / opposite the blade part 232 of the fan wheel. This channel serves to guide the airflow and ensures the wind power of the hand fan. Thus, during motor operation, the air flows successively through the inlet, the flow channel, and the outlet to produce the air discharge of the hand fan.

[0045] Furthermore, the stator part 22 of the motor has a mounting frame 222. The mounting frame 222 is arranged opposite the rotor part 21 of the motor and is located on the front of the rotor part 21. The motor circuit board 3 is attached to the mounting frame 222. The arrangement of the mounting frame does not directly obstruct the airflow and ensures the wind power of the handheld fan. The mounting frame can be formed as a single unit with the rotor part or attached to the rotor part by gluing, snapping, or similar means; this is not specified here.

[0046] At least three support rods 223 extend forward from the mounting frame 222. The motor board 3 is attached to the end sections of the respective support rods 223. The structure is simple and stable.

[0047] In this patent, for a "high-speed fan" or "high-rotation fan," the speed of motor 2 during actual use must be no less than 20,000 rpm to achieve the practically required blowing effect. That is to say, the handheld fan is a high-speed handheld fan.

[0048] The motor in question can be a three-phase motor. Of course, it can also be a different type of motor, as long as it can achieve the high-speed effect.

[0049] Similarly, as a "high-speed fan" or "high-rotation fan," the motor's power output must be at least 35 W due to the high rotational speed. During actual use, the battery output voltage is typically 7.4 V, and the corresponding current can be nearly 5 A. Under these conditions, the motor can reach the required speed and achieve the necessary blowing effect. At the same time, the heat generated by the motor board is considerable under these conditions. Therefore, mounting the motor boards independently on the motor in the wind tunnel section allows for rapid and effective heat dissipation. Furthermore, the heat emitted by the motor board does not affect other electronic components.

[0050] The above description presents one or more embodiments provided in conjunction with specific content and should not be interpreted as limiting the actual implementation of the present application to these descriptions. Anything similar to or identical with the methods, structures, etc., of the present application, or which makes several technical derivations or substitutions based on the application's concept, should be considered within the scope of protection of the present application.

Images