Hair dryer with blowback ash removal function

Abstract

The present application discloses a dryer with a blowback ash removal function, including a housing, a fan module, an air inlet, and an air outlet. The housing defines an airflow passage between the air inlet and the air outlet. The fan module is disposed in the airflow passage. A circuit control panel is disposed within the housing. The circuit control panel is provided with a microcontroller and a power supply module. The power supply module is connected to the fan module. The microcontroller is connected to the power supply module. The housing is provided with a reverse rotation button and a forward rotation button connected to the microcontroller. The microcontroller controls the fan module to rotate forward via the power supply module in response to a forward rotation signal output from the forward rotation button. The microcontroller controls the fan module to rotate reversely via the power supply module in response to a reverse rotation signal output from the reverse rotation button. The microcontroller responds to the reverse rotation signal output from the reverse rotation button only when the forward rotation button is not triggered. The present application is characterized by high ash removal efficiency.

Description

Technical Field

[0001] This application relates to the technical field of hair care devices, and particularly to a dryer having a blowback ash removal function.

Background Art

[0002] When performing hair drying and hair styling in hair care, the use of a hair care appliance such as a hair dryer is common. Currently, commercially available dryers are composed of a housing, a brush motor provided in the housing, blades, a heating resistance wire, and a switch. The housing has an air inlet and an air outlet. An intake baffle plate is provided at the air inlet, and several intake holes are provided on the intake baffle plate. When the dryer is connected to a commercial power supply, the switch is turned on, the blades are rotated by the brush motor to propel air, the air is heated by the energized heating resistance wire, and finally, the air is blown out from the air outlet to achieve purposes such as hair drying and hair styling.

[0003] However, for a dryer under long-term use, foreign matters such as hair and dust often block the intake holes of the intake baffle plate, and the intake air volume of the housing often decreases. Therefore, in order to maintain the smoothness of the air inlet, the user has to clean foreign matters such as hair and dust on the intake holes. However, since the number of intake holes is large and the user has to dredge each intake hole one by one, the ash removal efficiency is relatively low, and there are some points for improvement.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of the deficiencies of the prior art, the object of this application is to provide a dryer having a blowback ash removal function with the feature of high ash removal efficiency.

Means for Solving the Problems

[0005] The above technical object of this application is achieved by the following technical solutions. A blowback ash removal dryer comprising a housing, a fan module, an air intake port, and an air outlet, wherein the air intake port and air outlet are provided in the housing, the housing forms an airflow passage penetrating between the air intake port and the air outlet, the fan module is provided in the airflow passage of the housing, a circuit control panel connected to the fan module is provided inside the housing, and the housing is provided with a trigger unit connected to the circuit control panel for controlling the forward or reverse rotation of the fan module.

[0006] According to the above proposed technology, the forward rotation of the fan module can be controlled by a trigger, and the fan module will draw in air from the intake port and blow it out from the outlet, achieving the purpose of drying hair. If foreign matter such as hair and dust clogs the intake port and the airflow from the outlet decreases, the trigger can be used to control the fan module to rotate in reverse, and the fan module will draw in air from the outlet and blow it out from the intake port, making it easier to blow out foreign matter such as hair and dust that is obstructing the intake port in the reverse direction. This improves the efficiency of ash removal from the intake port by eliminating the conventional method of the user manually cleaning the intake port.

[0007] Preferably, the circuit control panel includes a microcontroller. A is provided, and inside the housing, A power supply drive module is provided, the power supply drive module is connected to the fan module, the microcontroller is connected to the power supply drive module, and the trigger unit is connected to the microcontroller.

[0008] According to the above proposed technology, the arrangement of the microcontroller and the power supply module allows the microcontroller to rotate the fan module via the power supply module when the user triggers the trigger unit.

[0009] Preferably, the trigger unit includes a reverse rotation button and a forward rotation button connected to a microcontroller provided in the housing, wherein the microcontroller controls the fan module via a power drive module to rotate it in the forward direction in response to a forward rotation signal output from the forward rotation button, and controls the fan module via a power drive module to rotate it in the reverse direction in response to a reverse rotation signal output from the reverse rotation button, wherein the microcontroller responds to the reverse rotation signal output from the reverse rotation button only when the forward rotation button is not triggered.

[0010] According to the above proposed technology, the forward rotation button is triggered to rotate the fan module forward, causing the fan module to draw in air from the intake and blow it out from the outlet. If foreign matter such as hair or dust clogs the intake and reduces the airflow from the outlet, the reverse rotation button can be triggered to control the fan module and rotate it in reverse. This allows the fan module to draw in air from the outlet and blow it out from the intake, making it easier to blow away any foreign matter such as hair or dust that is obstructing the intake in the reverse direction. The separate placement of the forward rotation button and the reverse rotation button improves user convenience.

[0011] Preferably, the fan module is Drive motor and Drive motor The output shaft of the said Drive motor It is electrically connected to the power supply drive module.

[0012] According to the above technical proposal, the power drive module is: Drive motor By rotating the blades in either forward or reverse direction at high speed, an airflow can be formed through the blades, achieving both forward airflow (intake from the intake port and blown out from the outlet) and reverse airflow (intake from the outlet and blown out from the intake port). This enables the use of a dryer blowing function in the forward airflow and a blowback ash removal function at the dryer's intake port in the reverse airflow.

[0013] Preferably, the airflow passage is provided with a mounting sleeve, Drive motor It is placed in the mounting sleeve. There are .

[0014] According to the above technical proposal, The mounting sleeve can serve the purpose of protecting the drive motor.

[0015] Preferably, the intake port is provided with an intake baffle plate, the intake baffle plate is provided with several intake holes, and a sponge filter mesh is provided on the inside of the intake baffle plate.

[0016] According to the above proposed technology, when the fan module rotates forward, air flows in from the intake port, large-diameter foreign particles are blocked out by the intake port, and fine, soft foreign matter such as dust and hair is blocked out by the sponge filter mesh. As a result, when the fan module rotates backward, air is blown out from the intake port, which makes it easier for the blocked foreign matter to be blown out through the sponge filter mesh and intake port.

[0017] Preferably, the reverse rotation button is a push button, and the microcontroller outputs a modulated control signal to the power supply drive module in response to the reverse rotation signal output from the reverse rotation button, and controls the fan module via the power supply drive module to rotate in reverse at a preset rotation speed.

[0018] According to the above technical proposal, when the reverse rotation button is triggered, the fan module can rotate in reverse at a preset rotation speed, thereby achieving blowback ash removal at a constant rotation speed, with a simple structure and convenient operation.

[0019] Preferably, the reverse rotation button is a stepless adjustment switch, and the microcontroller outputs a modulated control signal to the power supply drive module in response to the reverse rotation signal output from the reverse rotation button, and controls the fan module via the power supply drive module to rotate in reverse at the adjusted rotation speed.

[0020] According to the above technical solution, when the reverse rotation button is a stepless adjustment switch, when the fan module rotates in reverse, by realizing the adjustment control of the reverse rotation speed along with the adjustment of the stepless adjustment switch, it is easy for the user to reasonably adjust the reverse rotation wind speed according to the situation of foreign object blockage, realize the adjustment of the blowback ash removal intensity, and have high adaptability.

[0021] Preferably, the forward rotation button is a stepless adjustment switch, and the microcontroller outputs a modulation control signal to the power drive module in response to a forward rotation signal output from the forward rotation button, and controls the fan module through the power drive module to rotate forward at an adjusted rotation speed.

[0022] According to the above technical solution, the forward rotation button is arranged as a stepless adjustment switch. With the arrangement of the forward rotation button, the adjustment control of the forward rotation speed and the adjustment of the air speed at the air outlet can be realized, and the adaptability is high.

[0023] Preferably, a current detection circuit and a rotation speed detection circuit are connected to the microcontroller. The current detection circuit is connected to the power drive module and is used to obtain the current input current of the fan module. The rotation speed detection circuit is connected to the fan module and is used to obtain the current rotation speed of the fan module. The microcontroller is used to control the dryer to enter the ash removal detection mode. In the ash removal detection mode, the microcontroller compares the current input current at the current rotation speed with the rated input current at the rated rotation speed based on the current rotation speed and the current input current of the fan module when the forward rotation button is triggered, and controls the fan module to enter the pending ash removal state. In the pending ash removal state, after a preset time when the forward rotation button is not triggered, the microcontroller controls the fan module to rotate in reverse for a preset time.

[0024] According to the above technical solution, the current detection circuit is used to detect the current input of the fan module in real time, and the rotation speed detection circuit is used to detect the current rotation speed of the fan module. When the microcontroller controls the driver to enter the dust removal detection mode, the microcontroller can compare the current rotation speed and the current input current with the rated rotation speed and the rated input current. Since the fan module rotates at a certain rotation speed, when the wind resistance in the air flow path increases, the current rotation speed of the fan module decreases, and the microcontroller maintains the current rotation speed below the rated rotation speed, thereby increasing the current input of the fan module. In this case, when comparing the current input current with the rated input current, if the current input current exceeds the error range of the rated input current, it indicates that the air inlet is clogged with foreign matters such as dust and hair, and the wind resistance in the air flow path increases.

[0025] In the case of a pending dust removal state, after the driver does not blow air for a preset time, the microcontroller rotates the fan module in the reverse direction for a preset time to blow off foreign matters such as hair and dust on the air inlet in the reverse direction, so as to achieve the purpose of back blowing dust removal.

[0026] Preferably, the housing is further provided with a changeover switch connected to the microcontroller, and the changeover switch is configured to have an automatic dust removal mode and a manual dust removal mode. In the manual dust removal mode, the reverse rotation button can be manually activated. In the automatic dust removal mode, the microcontroller controls the driver to enter the dust removal detection mode.

[0027] According to the above technical solution, the user can autonomously select the dust removal mode, thereby improving the convenience of using the back blowing dust removal function of the driver.

[0028] Preferably, the power drive module includes a rectifier unit, a filter unit, and an inverter unit, the inverter unit being connected to the filter unit and the fan module, respectively, and the inverter unit receiving a modulated control signal output by a microcontroller to control the operation of the fan module.

[0029] According to the above proposed technology, the microcontroller outputs a modulation control signal to the inverter unit, which in turn controls the forward rotation, reverse rotation, and rotational speed adjustment of the fan module. [Effects of the Invention]

[0030] As explained above, this invention has the following beneficial effects compared to the prior art. When foreign matter such as hair and dust clogs the air intake and reduces the airflow from the outlet, this invention allows the fan module to be controlled to rotate in reverse by triggering the reverse rotation button. Furthermore, the fan module can draw in air from the outlet and blow it out from the air intake, making it easier to blow away foreign matter such as hair and dust that is obstructing the air intake in the reverse direction. This improves the efficiency of ash removal from the air intake by eliminating the conventional method of the user manually cleaning the air intake. [Brief explanation of the drawing]

[0031] [Figure 1] This is a schematic diagram of the first integrated structure of a hair dryer according to one embodiment of the present invention. [Figure 2] This is a schematic diagram of a second integrated structure of a hair dryer according to one embodiment of the present invention. [Figure 3] This is a cross-sectional view of a hair dryer according to one embodiment of the present invention. [Figure 4] This is a schematic diagram of the structure of a hair dryer equipped with a changeover switch according to one embodiment of the present invention. [Figure 5] This is a circuit diagram of a circuit control panel according to one embodiment of the present invention. [Figure 6]This is a circuit diagram of a power supply drive module according to one embodiment of the present invention. [Explanation of Symbols]

[0032] 1...Housing, 2...Fan module, 21... Drive motor 22...Blades, 3...Heating module, 4...Air intake, 5...Air outlet, 6...Airflow passage, 7...Anti-vibration rubber bushing, 8...Mounting sleeve, 9...Duct, 10...Intake baffle plate, 11...Intake hole, 12...Circuit control panel, 121...Microcontroller, 122...Power drive module, 13...Reverse rotation button, 14...Forward rotation button, 15...Changeover switch. [Modes for carrying out the invention]

[0033] The following clearly and completely describes the technical proposal in the embodiments of this application, linking it with the accompanying drawings. Clearly, the embodiments described are only some, not all, embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are all within the scope of protection of this application.

[0034] As shown in relation to Figures 1 and 3, this is a blowback ash removal dryer that includes a housing 1, a fan module 2, a heating module 3, an air intake 4, and an air outlet 5. The housing 1 is cylindrical in shape, the air intake 4 is located at the lower end of the housing 1, and the air outlet 5 is located at the upper end of the housing 1. The housing 1 forms an airflow passage 6 that penetrates between the air intake 4 and the air outlet 5. The heating module 3 and the fan module 2 are sequentially located in the airflow passage 6 of the housing 1, with the fan module 2 being closer to the air intake 4 and the heating module 3 being closer to the air outlet 5.

[0035] Fan module 2 is, Drive motor 21 and Drive motor It includes a vane 22 provided on the output shaft 21. In one embodiment, Drive motor21 is a brushless motor 21 The brushless motor 21 This is a high-energy-density neodymium-iron-boron external rotor brushless motor 21, and the blades 22 are made of composite material. The brushless motor 21 has a stator made of a single-layer ultra-thin silicon steel sheet member of 0.2 mm and a motor rotor made of multiple neodymium-iron-boron magnets, and can reduce the volume by more than 10 times compared to a carbon brush motor with ferrite magnets for the same output. In another embodiment, the drive motor 21 is a brushed motor, and is not particularly limited in this embodiment. .

[0036] The airflow passage 6 is provided with vibration-damping rubber bushings 7, and the vibration-damping rubber bushings 7 are provided with mounting sleeves 8. Drive motor 21 is coaxially positioned in the mounting sleeve 8, and the mounting sleeve 8 is Drive motor Several ducts 9 are distributed at intervals around the circumferential direction of 21, and each duct 9 faces the vane 22 and the intake port 4. In one embodiment, an intake baffle plate 10 is attached to the intake port 4 by screws, and several intake holes 11 are provided on the intake baffle plate 10, and a sponge filter mesh is provided on the inside of the intake baffle plate 10, so that the intake baffle plate 10 can block large-diameter foreign particles from coming out, and the sponge filter mesh can block fine, soft, small-diameter foreign particles such as dust and hair from coming out.

[0037] Therefore, after prolonged use of the hair dryer, a relatively large amount of small-diameter foreign matter such as dust and hair adheres to the outside of the sponge filter mesh, reducing the air intake volume at the air intake port 4 and affecting the air outlet volume at the air outlet port 5. Because small-diameter foreign matter such as dust and hair adheres to the outer surface of the sponge filter mesh, it is time-consuming to insert the hair into the air intake holes 11 one by one to pick it up and remove it. For this reason, this invention proposes a hair dryer having the following blowback ash removal function to solve this problem.

[0038] Specifically, as shown in relation to Figures 3 and 5, a circuit control panel 12 is fixedly installed inside the housing 1. The circuit control panel 12 is located between the air intake 4 and the fan module 2. Air flows in from the air intake 4 and passes through the circuit control panel 12, cooling the circuit control panel 12. The circuit control panel 12 is connected to the fan module 2, and the housing 1 is provided with a trigger unit connected to the circuit control panel 12 to control the forward or reverse rotation of the fan module 2.

[0039] The trigger unit can control the forward or reverse rotation of the fan module 2. When the fan module 2 rotates forward, air is introduced from the intake port and blown out from the outlet port. Conversely, when the fan module 2 rotates backward, air is introduced from the outlet port and blown out from the intake port. The form in which the trigger unit controls the forward or reverse rotation of the fan module 2 is not limited. In one embodiment, the trigger unit uses a physical button, and pressing the trigger unit once controls the fan module to rotate forward, while pressing the trigger unit twice quickly controls the fan module 2 to rotate backward. In another embodiment, the trigger unit may use a touch button, and the logic for controlling the forward or reverse rotation of the fan module 2 may be customized according to the user's requirements.

[0040] in particular, In one embodiment, The circuit control panel 12 includes a microcontroller 121. A is provided, and inside housing 1, A power drive module 122 is provided, and the power drive module 122 is connected to the fan module 2, and the power drive module 122 is connected to the fan module 2 Drive motor It is electrically connected to 21. In another embodiment, the power supply drive module 122 and the microcontroller 121 are located in the circuit control panel 12. The location of the power supply drive module 122 can be adjusted as needed and is not particularly limited in this embodiment.

[0041] The microcontroller 121 is connected to the power supply drive module 122. Referring to Figures 1 and 2, if the trigger unit is a physical button, the trigger unit may include a reverse rotation button 13 and a forward rotation button 14 provided on the housing 1 and connected to the microcontroller 121. In this case, when the forward rotation button 14 is triggered, the microcontroller 121 outputs a modulated control signal to the power supply drive module 122 in response to the forward rotation signal output from the forward rotation button 14, in order to control the fan module 2 via the power supply drive module 122 to rotate in the forward direction. When the reverse rotation button 13 is triggered, the microcontroller 121 outputs a modulated control signal to the power supply drive module 122 in response to the reverse rotation signal output from the reverse rotation button 13, in order to control the fan module 2 via the power supply drive module 122 to rotate in the reverse direction. In particular, the microcontroller 121 responds to the reverse rotation signal output from the reverse rotation button 13 only when the forward rotation button 14 is not triggered. That is, if the user presses the forward rotation button 14 to control the fan module 2 to rotate in the forward direction, even if the user triggers the reverse rotation button 13, the microcontroller 121 will not control the fan module 2 to operate in response to the reverse rotation signal output from the reverse rotation button 13. In other words, the priority level of the microcontroller 121 for the forward rotation signal is higher than that for the reverse rotation signal.

[0042] When the fan module 2 rotates forward, air flows in from the intake port 4 and out from the outlet port 5, forming a forward-flowing airflow in the airflow passage 6, thereby enabling the use of the dryer's blowing function. Conversely, when the fan module 2 rotates backward, air flows in from the outlet port 5 and out from the intake port 4, forming a reverse-flowing airflow in the airflow passage 6. This airflow can impact the sponge filter mesh and the intake baffle plate 10, and further blows away foreign matter such as dust and hair on the outside of the sponge filter mesh and the intake baffle plate 10, thereby achieving a reverse ash removal function.

[0043] The following provides a detailed explanation of the forward and reverse rotation of Fan Module 2.

[0044] As shown in relation to Figures 5 and 6, the power drive module 122 is used to supply power to the fan module 2 and drive the fan to rotate in response to a modulation control signal (PWM signal) output from the microcontroller 121. The power drive module 122 includes a rectifier unit, a filter unit, and an inverter unit. The rectifier unit has an input terminal and an output terminal. The input terminal of the rectifier unit is connected to a 220V AC commercial power supply via a plug, and the output terminal of the rectifier unit is coupled to the filter unit.

[0045] In one embodiment, the inverter unit consists of six power transistors (Q1 to Q6), and the inverter unit has an input terminal, an output terminal, and a control terminal, the input terminal of the inverter unit is coupled to the filter unit, and the output terminal of the inverter unit is coupled to the fan module 2. Drive motor The control terminal of the inverter unit is connected to the microcontroller 121, which receives a modulation control signal and controls the operation of the fan module 2. Drive motor Part 21 is equipped with a Hall sensor for detecting the position of the rotor. Drive motor To rotate 21, the microcontroller 121 detects the rotor's position using a Hall sensor, determines the on (or off) sequence of the power transistors in the inverter unit based on the stator windings, sequentially flows current through the motor windings to generate a forward (or reverse) rotating magnetic field, and interacts with the rotor's magnets, Drive motor 21 clockwise / counterclockwise (forward / reverse) rotations are achieved. Furthermore, the microcontroller 121 can change the frequency of the stator rotating magnetic field by modulating its output modulated control signal, thereby changing the rotor's rotation speed and enabling control of the fan module 2's rotation speed.

[0046] Therefore, the inverter unit, Drive motorFor use with the rectifier unit and filter unit, the DC power converted can be converted back to AC power, and based on the modulated control signal output from the microcontroller 121, the forward rotation, reverse rotation and rotational speed of the fan module 2 are controlled.

[0047] In one embodiment, the forward rotation button 14 is a stepless adjustment switch, and the microcontroller 121 outputs a modulation control signal to the power supply drive module 122 in response to the forward rotation signal output from the forward rotation button 14, and controls the fan module 2 via the power supply drive module 122 to rotate forward at the adjusted rotation speed. In another embodiment, the forward rotation button 14 is a multi-speed switch, and the microcontroller 121 outputs a modulation control signal to the power supply drive module 122 in response to the forward rotation signal output from the forward rotation button 14, and controls the fan module 2 via the power supply drive module 122 to rotate forward at the rotation speed of each speed setting.

[0048] In one embodiment, the reverse rotation button 13 is a push button, and the microcontroller 121 outputs a modulation control signal to the power supply drive module 122 in response to the reverse rotation signal output from the reverse rotation button 13, and controls the fan module 2 via the power supply drive module 122 to rotate in reverse at a preset rotation speed. In another embodiment, the reverse rotation button 13 is a stepless adjustment switch, and the microcontroller 121 outputs a modulation control signal to the power supply drive module 122 in response to the reverse rotation signal output from the reverse rotation button 13, and controls the fan module 2 via the power supply drive module 122 to rotate in reverse at an adjusted rotation speed.

[0049] As a result, if foreign matter such as hair and dust clogs the air intake port 4 and reduces the airflow from the outlet port 5, the reverse rotation button 13 can be triggered to control the fan module 2 and make it rotate in reverse at high speed. Furthermore, the fan module 2 can take in air from the outlet port 5 and blow it out from the air intake port 4, thereby blowing away foreign matter such as hair and dust that is obstructed in the air intake port 4 in the reverse direction. This eliminates the conventional method of the user manually cleaning the air intake port 4, thereby improving the efficiency of ash removal from the air intake port 4.

[0050] As shown in relation to Figures 4 and 5, in one embodiment, the housing 1 is further provided with a changeover switch 15 connected to a microcontroller 121, and the changeover switch 15 is configured to have an automatic ash removal mode and a manual ash removal mode. In manual ash removal mode, the reverse rotation button 13 can be manually activated, and the user can control the fan module 2 to rotate in reverse by manually triggering the reverse rotation button 13.

[0051] In automatic ash removal mode, the microcontroller 121 controls the dryer to enter ash removal detection mode, and the ash removal detection mode in automatic ash removal mode will be described in detail below.

[0052] The microcontroller 121 is connected to a current detection circuit and a rotational speed detection circuit. The current detection circuit is connected to the power drive module 122 and used to obtain the current input current of the fan module 2. The rotational speed detection circuit is connected to the fan module 2 and used to obtain the current rotational speed of the fan module 2. The Hall sensor is located in the fan module 2. Drive motor The rotational position of the 21 rotors can be detected, and the rotational speed detection circuit can acquire the current rotational speed of the fan module 2 based on the Hall sensor.

[0053] In automatic ash removal mode, the microcontroller 121 controls the dryer to enter ash removal detection mode. In ash removal detection mode, the microcontroller 121 performs calculations and makes decisions based on the current rotation speed and current input current. Based on the current rotation speed and current input current of the fan module 2 when the forward rotation button 14 is triggered, the microcontroller 121 compares the current input current at the current rotation speed with the rated input current at the rated rotation speed and controls the fan module 2 to enter a pending ash removal state.

[0054] in particular, Drive motor The relationship between the output and rotational speed of 21 is P = T * n / 9550, where P is the rated output, n is the rated rotational speed (minutes / revolution), and T is the rated torque. Rated output = rated voltage * rated current. Therefore, Drive motor When controlling the rotation speed of 21 to a constant level, Drive motor When the rotational speed of 21 decreases, Drive motor To maintain a rotational speed of 21 Drive motor The output of 21 will improve.

[0055] After the user triggers the forward rotation button 14, the rotation of the fan module 2 is controlled, and the rotation speed of the fan module 2 is set to the rotation speed adjusted by the forward rotation button 14. The following explanation will describe the case where the forward rotation button 14 is located in one of the adjustable speed settings, where the forward rotation button 14 has the rated rotation speed and rated input current in that adjustable speed setting.

[0056] If the air intake port 4 becomes clogged with dust, hair, or other foreign matter, increasing the airflow resistance in the air passage 6, the fan module 2 will have difficulty rotating, and its current rotational speed will decrease. To maintain the current rotational speed at the rated speed, the microcontroller 121 increases the current input current to the fan module 2, thereby improving the output of the fan module 2 and maintaining its current rotational speed at the rated speed. By comparing the current input current with the rated input current, if the current input current exceeds the error range of the rated input current, it indicates that the air intake port 4 is clogged with dust, hair, or other foreign matter, and the microcontroller 121 controls the dryer to enter a pending ash removal state.

[0057] In the pending ash removal state, the microcontroller 121 controls the fan module 2 to rotate in reverse for a preset time after a preset period of time during which the forward rotation button 14 has not been triggered. In one embodiment, the preset period during which the forward rotation button 14 has not been triggered is 5 minutes, and the preset period for the fan module 2 to rotate in reverse is 5 seconds.

[0058] The placement of the toggle switch 15 allows the user to make their own selection, and in automatic ash removal mode, the microcontroller 121 controls the dryer to automatically perform the blowback ash removal function without the user having to trigger the reverse rotation button 13 on their own, thereby improving the convenience of using the blowback ash removal function.

[0059] The foregoing describes only exemplary embodiments of the present application and does not limit the scope of protection of the present application, which is determined by the appended claims.

Claims

1. A blowback ash removal dryer comprising a housing (1), a fan module (2), an air intake (4), and an air outlet (5), wherein the air intake (4) and the air outlet (5) are provided in the housing (1), the housing (1) forms an airflow passage (6) that penetrates between the air intake (4) and the air outlet (5), and the fan module (2) is provided in the airflow passage (6), A circuit control panel (12) connected to the fan module (2) is provided within the airflow passage (6) of the housing (1), and the circuit control panel (12) is located between the intake port (4) and the fan module (2). The circuit control panel (12) is equipped with a microcontroller (121), and a power drive module (122) is provided inside the housing (1). The power drive module (122) is connected to the fan module (2), and the microcontroller (121) is connected to the power drive module (122). The microcontroller (121) is connected to a current detection circuit and a rotational speed detection circuit. The current detection circuit is used to obtain the current input current of the fan module (2), and the rotational speed detection circuit is connected to the fan module (2) and used to obtain the current rotational speed of the fan module (2). The housing (1) is provided with a reverse rotation button (13) and a forward rotation button (14) connected to the microcontroller (121), and a changeover switch (15) connected to the microcontroller (121), the changeover switch (15) having an automatic ash removal mode and a manual ash removal mode. (a) In manual ash removal mode, when the forward rotation button (14) is not triggered, the microcontroller (121) responds to the reverse rotation signal output from the reverse rotation button (13) by outputting a modulated control signal to the power drive module (122), and controls the fan module (2) via the power drive module (122) to rotate in reverse at a preset rotation speed. (b) In automatic ash removal mode, the microcontroller (121) enters ash removal detection mode and, while the forward rotation button (14) is triggered, controls the power drive module (122) to maintain the rotation speed of the fan module (2) at the rated rotation speed corresponding to the adjustment state of the forward rotation button (14), based on the current rotation speed of the fan module (2) acquired by the rotation speed detection circuit, and compares the current input current acquired by the current detection circuit with the rated input current corresponding to the adjustment state of the forward rotation button (14), and controls the fan module (2) to enter a pending ash removal state if the current input current exceeds the error range of the rated input current. In the pending ash removal state, the microcontroller (121) controls the fan module (2) to rotate in the reverse direction for a preset time after a preset period of time when the forward rotation button (14) has not been triggered. A hair dryer featuring a blowback ash removal function.

2. The dryer having a blowback ash removal function according to claim 1, characterized in that the fan module (2) includes a drive motor (21) and a blade (22) provided on the output shaft of the drive motor (21), and the drive motor (21) is electrically connected to the power drive module (122).

3. The blowback ash removal function dryer according to claim 2, characterized in that a mounting sleeve (8) is provided in the airflow passage (6), and the drive motor (21) is located in the mounting sleeve (8).

4. A blowback ash removal dryer according to claim 1, characterized in that an intake baffle plate (10) is provided in the intake port (4), several intake holes (11) are provided in the intake baffle plate (10), and a sponge filter mesh is provided on the inside of the intake baffle plate (10).

5. The hair dryer having a blowback ash removal function according to claim 1, characterized in that the forward rotation button (14) is a stepless adjustment switch, the microcontroller (121) outputs a modulated control signal to the power drive module (122) in response to the forward rotation signal output from the forward rotation button (14), and controls the fan module (2) via the power drive module (122) to rotate it in the forward direction at the adjusted rotation speed.

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