Hair dryer

Abstract

A hair dryer comprises a main body shell, a handle shell, a motor arranged in the main body shell, a PCB board and electronic components arranged on the PCB board, one end of the PCB board is arranged in the handle shell and the other end extends into the main body shell, and the air outlet of the motor faces the PCB board located in the main body shell. In the present invention, the air outlet of the motor faces the PCB board, and the temperature of the electronic components on the PCB board can be reduced by convection heat dissipation, thereby increasing the stability of the hair dryer.

Description

Technical Field

[0001] The invention relates to the field of household appliances, and more particularly to a hair dryer. Background Art

[0002] Traditional hair dryers usually have a main PCB in the handle, and electronic components that generate less heat are placed on this PCB. In order to avoid overheating and affecting their performance, some electronic components that generate more heat during operation need to be cooled by blowing air. They are often fixed on a heating wire rack inside the hair dryer or on another small PCB. In order to form a complete circuit, there must be many connecting wires between the main PCB and the internal electronic components that generate more heat. The structure is complex, which increases the difficulty and cost of assembly and has a high defect rate.

[0003] Therefore, how to develop an integral integrated PCB assembly that is convenient for heat dissipation of electronic devices and simplifies the structure for easy assembly is an urgent problem to be solved in this field. Summary of the invention

[0004] In order to facilitate the heat dissipation of electronic devices and simplify the structure of an integrated PCB assembly for easy assembly, the present invention provides a hair dryer.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A hair dryer comprises a main body shell, a handle shell, a motor arranged in the main body shell, a PCB board and electronic components arranged on the PCB board, one end of the PCB board is arranged in the handle shell and the other end extends into the main body shell, and an air outlet of the motor faces the PCB board located in the main body shell.

[0007] Preferably, the motor includes a motor shaft, a stator assembly sleeved on the motor shaft, fan blades, and an annular shell spaced apart from the stator assembly, the space between the annular shell and the stator assembly is a first air duct, the two ends of the first air duct are respectively the air inlet and the air outlet of the motor, and the fan blades are arranged at the air inlet of the motor.

[0008] Preferably, the PCB board is provided with a through hole for the stator assembly to pass through, and the diameter of the through hole is larger than the outer diameter of the stator assembly.

[0009] Preferably, the inner diameter of the annular housing is greater than the diameter of the through hole.

[0010] Preferably, it also includes a bracket arranged in the main shell for installing the motor, and a back cover arranged at the air inlet of the main shell, a fine-pored air inlet net is provided between the back cover and the bracket, a plurality of first air inlets are provided on the back cover, a plurality of second openings connected to the first air inlets are provided on the side of the fine-pored air inlet net, and the bracket is provided with a third opening connected to the second opening.

[0011] Preferably, a mounting plate for placing the slow fine-pore air inlet net is provided on the bracket, and a positioning boss for positioning the fine-pore air inlet net is provided on the mounting plate.

[0012] Preferably, a circle of sound-absorbing cotton is provided between the mounting plate and the rear cover and is in contact with the main body shell.

[0013] Preferably, it also includes an insulation tube arranged in the main shell, wherein an air guide tube is provided in the insulation tube and connects the stator assembly and the front end of the insulation tube, a second air duct is formed between the air guide tube and the insulation tube, and a heating wire is provided in the second air duct.

[0014] Preferably, a plurality of fourth openings are provided at the front end of the heat-insulating cylinder facing the air duct.

[0015] Preferably, the fourth opening is a concentrically arranged annular opening, and the annular opening is provided with a plurality of reinforcing ribs evenly distributed around the center of the circle.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The hair dryer provided by the present invention has a PCB board extending from the handle shell into the main body shell, and the air outlet of the motor faces the PCB board located in the main body shell, so that the electronic devices on the PCB board can be dissipated by active convection, and the structure is simplified to facilitate assembly and increase the stability of the hair dryer; a fine-pore air inlet net is added to the air inlet of the main body shell, so that the external air is first attenuated and then blown out from the air outlet of the main body shell, which effectively reduces noise and improves user experience; the heat-insulating cylinder adopts an air outlet with double annular openings, so that the airflow in the hair dryer is evenly ejected through the double annular openings, the wind temperature is uniform, the wind speed is fast, and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of an embodiment;

[0019] Figure 2 for Figure 1 Section view of AA in the middle;

[0020] Figure 3 for Figure 1 A partial enlarged view of

[0021] Figure 4 An exploded view of an embodiment;

[0022] Figure 5 for Figure 1 Right view of;

[0023] Figure 6 A cross-sectional view of the currently used technology. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Reference Figure 1-2 A hair dryer is provided as an embodiment of the present invention, comprising a main body shell 1, a handle shell 2, a motor 3, a PCB board 4 and electronic devices, wherein the motor is arranged in the main body shell, the PCB board extends from the handle shell into the main body shell, the air outlet of the motor 3 faces the PCB board located in the main body shell, and the air outlet of the motor blows toward the PCB board part in the main body shell, thereby performing convection heat dissipation on the electronic devices on the PCB, thereby reducing the temperature of the electronic devices and increasing the stability of the hair dryer.

[0026] The motor 3 includes a motor shaft 31, a stator assembly 32, fan blades 33, and an annular shell 34. The stator assembly 32 is sleeved on the motor shaft 31 near the air outlet end of the motor. The fan blades 33 are also sleeved on the motor shaft. The fan blades are arranged at the air inlet end of the motor. The space between the annular shell and the stator assembly is a first air duct 35. The two ends of the first air duct are the air inlet and the air outlet of the motor respectively.

[0027] In some preferred embodiments, a through hole 41 is provided on the PCB board 4, and the end of the stator assembly 32 passes through the through hole 41. The diameter of the through hole 41 is larger than the outer diameter of the stator assembly 32, and the wind blown out from the air outlet of the motor can be blown from the gap between the stator assembly and the through hole to the air outlet of the main shell. Preferably, the inner diameter of the annular shell 34 is larger than the diameter of the through hole 41, that is, a part of the first air duct covers a part of the PCB board, so that a part of the wind from the first air duct will be blown directly to the PCB board, and will be blown to other positions along the PCB board to dissipate the heat of the electronic components on the PCB board. In order to better dissipate heat, the electronic components with higher power can be placed on the PCB board in the shell body, and the heat can be dissipated by convection, and the electronic components with lower power can be placed on the PCB board in the handle shell.

[0028] A bracket 5 is also provided in the main shell, and the bracket 5 is used to install the motor. A back cover 6 is also provided at the air inlet of the main shell, and a fine-pored air inlet net 7 is provided between the back cover 6 and the bracket 5. A third opening 51 connected to the air inlet of the motor is provided on the bracket 5, and the fine-pored air inlet net completely covers the third opening. A number of second openings are provided on the side of the fine-pored air inlet net, and a number of first air inlets are provided around the circumference of the back cover. The first air inlet, the second opening, and the third opening are connected to each other. External air enters from the first air inlet, is buffered by the fine-pored air inlet net, and then flows from the second opening to the third opening, and then passes through the motor, which can reduce the noise of the hair dryer and improve the user experience. Figure 6 As shown, a conventional hair dryer is driven by a motor 200 fixed on a motor bracket 100 to rotate the fan blades. When the fan blades rotate, air is sucked in from the air inlet 300 at the rear of the hair dryer, passes through the motor bracket, and then passes through the heating wire rack 400 placed at the front end of the motor rack, and finally blows directly from the air outlet 500. When the heating wire on the heating wire rack is working, the heat generated is carried away by the air flow, and hot air comes out of the air outlet; when the heating wire is not working, cold air comes out of the air outlet. The airflow of this type of hair dryer passes through its rear end and directly passes through the motor bracket. There is no silencer structure design. The noise of the motor working and the friction noise generated by the air flow through the internal parts such as the air inlet net are directly transmitted from the inside without attenuation, which is relatively loud and affects the user experience. Adding a fine-pore air inlet net and changing the air inlet method to a fine-pore air inlet net side air inlet method can solve this problem and reduce its noise.

[0029] The bracket 5 is provided with a mounting plate 52 for placing the fine-pore air inlet net 7, and a positioning boss 521 for positioning the fine-pore air inlet net is provided on the mounting plate 52. One end of the fine-pore air inlet net is placed on the mounting plate, and the other end is abutted against the inner surface of the rear cover. A circle of silencer cotton 8 is also provided between the mounting plate 52 and the rear cover 6, and the silencer cotton is in contact with the main body shell.

[0030] An insulation tube 9 is also provided in the main shell 1. The insulation tube is a cylindrical structure. An air guide tube 10 is provided between the front end of the insulation tube 9 and the stator assembly. The outer wall of the insulation tube fits the inner wall of the main shell. A second air duct 20 is formed between the air guide tube and the insulation tube 9. A heating wire 30 is provided in the second air duct 20. A gap is provided between the PCB board and the inner wall of the main shell. The wind blown out of the air outlet of the motor will be respectively collected into the second air duct from the through hole 41 and the gap between the PCB board and the main shell, and then blown out from the air outlet of the insulation tube. A plurality of fourth openings 91 are provided on the circumference of the second air duct 20 at the front end of the insulation tube 9. Preferably, the fourth openings 91 are concentrically arranged annular openings; preferably, double annular openings, such as Figure 5 As shown, the double annular opening is provided with a plurality of reinforcing ribs evenly distributed around the center of the circle, and the reinforcing ribs can increase the structural strength of the annular opening.

[0031] like Figure 4 As shown, the handle housing is also provided with a sleeve 40, a plug 60 connected to the PCB board, and a wire protection sleeve 50 for fixing the power cord. These commonly used components are not described in detail here. The bracket 5 can also adopt an assembled structure of two halves.

[0032] The present invention is described in detail above through specific embodiments, and these detailed descriptions are only limited to helping those skilled in the art understand the content of the present invention, and cannot be understood as limiting the scope of protection of the present invention. Various modifications, equivalent transformations, etc. made by those skilled in the art to the above scheme under the conception of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hair dryer, comprising a main body housing (1), a handle housing (2), a motor (3) arranged in the main body housing (1), a PCB board (4) and an electronic device arranged on the PCB board (4), characterized in that: One end of the PCB board (4) is arranged in the handle housing (2), and the other end extends into the main housing (2); the air outlet of the motor (3) faces the PCB board (4) located in the main housing (1); The motor (3) comprises a motor shaft (31), a stator assembly (32) sleeved on the motor shaft, a fan blade (33), and an annular housing (34) spaced apart from the stator assembly; the space between the annular housing (34) and the stator assembly (32) is a first air duct (35); the two ends of the first air duct are respectively an air inlet and an air outlet of the motor; the fan blade (33) is arranged at the air inlet of the motor; the PCB board (4) is provided with a through hole (41) for the stator assembly (32) to pass through; the diameter of the through hole (41) is larger than the outer diameter of the stator assembly (32); It also includes an insulation tube (9) arranged in the main body shell (1), wherein an air guide tube (10) is provided in the insulation tube (9) and is connected to the stator assembly (32) and the front end of the insulation tube (9), a second air duct (20) is formed between the air guide tube (10) and the insulation tube (9), a heating wire (30) is provided in the second air duct (20), and the wind coming out of the first air duct (35) will flow into the second air duct (20) from the through hole (41), and a plurality of fourth openings (91) are provided at the front end of the insulation tube (9) facing the second air duct (20), and the fourth openings (91) are concentrically arranged annular openings, and the annular openings are provided with a plurality of reinforcing ribs evenly distributed around the center of the circle.

2. The hair dryer according to claim 1, characterized in that: The inner diameter of the annular housing (34) is greater than the diameter of the through hole (41).

3. The hair dryer according to claim 1, characterized in that: It also comprises a bracket (5) arranged in the main body shell (1) for mounting the motor, and a rear cover (6) arranged at the air inlet of the main body shell (1); a fine-pored air inlet net (7) is arranged between the rear cover (6) and the bracket (5); a plurality of first air inlets (61) are arranged on the rear cover; a plurality of second openings communicating with the first air inlets are arranged on the side of the fine-pored air inlet net (7); and the bracket (5) is provided with a third opening (51) communicating with the second opening.

4. The hair dryer according to claim 3, characterized in that: The bracket (5) is provided with a mounting plate (52) for placing the fine-pored air inlet net (7), and the mounting plate (52) is provided with a positioning boss (521) for positioning the fine-pored air inlet net.

5. The hair dryer according to claim 4, characterized in that: A circle of sound-absorbing cotton (8) is also provided between the mounting plate (52) and the rear cover (6) and is in close contact with the main body shell.

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