Bidirectional fan and speed regulation control circuit for bidirectional fan

Abstract

The bidirectional fan comprises a main control unit, a speed regulation unit, a forward and reverse rotation unit and a power supply unit, the forward and reverse rotation unit is provided with a forward and reverse rotation motor M1 and a forward and reverse rotation switch JK, and the forward and reverse rotation switch JK is electrically connected with the N end of the power supply unit and the first end of the forward and reverse rotation motor M1; the main control unit controls the speed regulation unit, the first end of a bidirectional silicon controlled rectifier of the speed regulation unit is electrically connected with the L end of the power supply unit, and the second end of the bidirectional silicon controlled rectifier is electrically connected with an LR circuit and is electrically connected with the second end of the forward and reverse rotation motor M1 through the LR circuit, so that the blowing air volume of the bidirectional fan is controlled; and the main control unit sends an instruction to the forward and reverse rotation switch JK and is used for controlling the forward and reverse rotation motor M1 to be switched into a forward rotation state and driving the bidirectional fan to perform forward air blowing or to be switched into a reverse rotation state and driving the bidirectional fan to perform reverse air blowing. And the purpose of conveniently adjusting the front and back blowing air volumes of the two-way fan is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fan speed control, in particular to a two-way fan and a speed control circuit for the two-way fan. Background Art

[0002] In the market, fans are usually used to pump and exchange indoor air to keep the indoor air fresh. For example, when it is necessary to exhaust the indoor air to the outside, an exhaust fan that pumps air outwards can be installed; when it is necessary to transport external air into the room, a fan that pumps air into the room can be installed. Therefore, in order to achieve the purpose of transporting air into the room and exhausting air to the outside, the existing method is to install fans that pump air in different directions into the room and to the outside respectively.

[0003] Although this traditional method of installing multiple fans can achieve pumping air in and out of the room, there are still the following defects:

[0004] 1. The circuit design of the existing fan can only control the fan to blow air in its front direction. When it is necessary to blow air from the back of the fan, only the air outlet surface of the whole fan can be turned to the back. Therefore, it brings a lot of inconvenience to the use of users; especially, when it is necessary to send air into the room or exhaust air to the outside, it is necessary to independently install multiple fans for sending air into the room and fans for exhausting air to the outside, and each fan needs to be manually operated and controlled, which is inconvenient to use and also increases the cost.

[0005] 2. The existing circuit design that uses a transformer or a voltage regulator to control the power supply voltage to control the fan speed is relatively complex. Usually, a relay is used to switch the speed control gears. Using a relay is prone to short circuit or open circuit of the contacts, which affects the speed control of the fan, and further affects the control of the air volume blown by the fan. Moreover, the relay also occupies a large installation space and the cost is relatively high. Summary of the Utility Model

[0006] In order to overcome the deficiencies of the prior art, one of the purposes of the present utility model is to provide a speed control circuit for a two-way fan.

[0007] One of the purposes of the present utility model is achieved by adopting the following technical solution: A speed control circuit for a two-way fan includes a main control unit and a speed control unit, a forward and reverse unit, and a power supply unit that are electrically connected to the main control unit. The forward and reverse unit has a forward and reverse motor M1 and a forward and reverse switch JK. The forward and reverse switch JK is electrically connected to the N terminal of the power supply unit and the first terminal of the forward and reverse motor M1;

[0008] The speed control unit has a triac connected in parallel. The first end of the triac is electrically connected to the L terminal of the power supply unit. The second end of the triac is electrically connected to an LR circuit, and the LR circuit is electrically connected to a voltage regulating capacitor and is electrically connected to the second end of the reversible motor M1 through this voltage regulating capacitor, for driving the reversible motor M1 and controlling and regulating the rotation speed and blowing air volume of the two-way fan; the third end of the triac is electrically connected to the main control unit;

[0009] The main control unit sends an instruction to the forward and reverse switch JK, for controlling the reversible motor M1 to switch to the forward rotation state and driving the two-way fan to blow air from the front, or switch to the reverse rotation state and driving the two-way fan to blow air from the back.

[0010] Further, the triac includes triacs T1 - T3, and the triacs T1 - T3 are connected in parallel with each other, and the first ends of the triacs T1 - T3 are all electrically connected to the L terminal of the power supply unit;

[0011] The LR circuit includes inductors LR1 - LR3; the second end of the triac T1 is electrically connected to the first end of the inductor LR1, and the second end of the inductor LR1 is electrically connected to the second end of the reversible motor M1, for controlling and regulating the reversible motor M1 to operate at the third gear speed;

[0012] The voltage regulating capacitor includes capacitors C1 and C1. The second end of the triac T2 is electrically connected to the first end of the inductor LR2, and the second end of the inductor LR2 is electrically connected to the capacitor C1 and is electrically connected to the second end of the reversible motor M1 through this capacitor C1, for controlling and regulating the reversible motor M1 to operate at the second gear speed;

[0013] The second end of the triac T3 is electrically connected to the first end of the inductor LR3, and the second end of the inductor LR3 is electrically connected to the capacitor C2 and is electrically connected to the second end of the reversible motor M1 through this capacitor C2, for controlling and regulating the reversible motor M1 to operate at the first gear speed.

[0014] Further, the third end of the triac T1 is connected to a resistor R1 and is electrically connected to the main control unit through this resistor R1. The third end of the triac T2 is connected to a resistor R2 and is electrically connected to the main control unit through this resistor R2. The third end of the triac T3 is connected to a resistor R3 and is electrically connected to the main control unit through this resistor R3.

[0015] Further, the forward and reverse switch JK has an S0 terminal, an S1 terminal and an S2 terminal;

[0016] The forward and reverse motor M1 has a main winding L1 and a secondary winding L2 that are electrically connected in parallel to each other, and a capacitor C3 connected in series between the main winding L1 and the secondary winding L2; the first ends of the main winding L1 and the capacitor C3 are electrically connected to the S2 terminal of the forward and reverse switch JK, and the first ends of the secondary winding L2 and the capacitor C3 are electrically connected to the S1 terminal of the forward and reverse switch JK; the second ends of the main winding L1 and the secondary winding L2 are both electrically connected to the LR circuit at the second end of the bidirectional thyristor.

[0017] The S0 terminal of the forward and reverse switch JK is electrically connected to the N terminal of the power supply unit. When the S0 terminal of the forward and reverse switch JK is connected to the S1 terminal, the capacitor C3 and the secondary winding L2 are energized to trigger the start of the forward and reverse motor M1 for forward rotation; when the S0 terminal of the forward and reverse switch JK is connected to the S2 terminal, the capacitor C3 and the secondary winding L1 are energized to trigger the start of the forward and reverse motor M1 for reverse rotation.

[0018] Furthermore, the speed control circuit for the two-way fan includes a shaking head unit electrically connected to the main control unit. The shaking head unit has a bidirectional thyristor T4 and a shaking head motor M2. The first end of the bidirectional thyristor T4 is electrically connected to the L terminal of the power supply unit, the second end of the bidirectional thyristor T4 is electrically connected to the second end of the shaking head motor M2, and the first end of the shaking head motor M2 is electrically connected to the N terminal of the power supply unit to control the two-way fan to blow air while shaking its head.

[0019] Furthermore, the third end of the bidirectional thyristor T4 is electrically connected to a resistor R4 and is electrically connected to the main control unit through this resistor R4.

[0020] Furthermore, the speed control circuit for the two-way fan includes a display unit electrically connected to the main control unit, which is used to display the gear position and air volume value of the two-way fan according to the instruction of the main control unit.

[0021] Furthermore, the speed control circuit for the two-way fan includes a receiving unit electrically connected to the main control unit, which is used to receive the signal of the remote controller and feedback this signal to the main control unit.

[0022] In order to overcome the deficiencies of the prior art, the second object of the present invention is to provide a two-way fan.

[0023] The second object of the present invention is achieved by adopting the following technical solution: A two-way fan includes the speed control circuit for the two-way fan described above.

[0024] Further, the two-way fan has a first blade and a second blade, and the first blade and the second blade are alternately arranged at intervals in the circumferential direction of the rotation output shaft; and the blade inclination directions of the first blade and the second blade are opposite to each other, and are used to control the first blade to rotate forward for blowing air from the front or control the second blade to rotate reversely for blowing air from the back through a speed control circuit.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0026] (1) The present application provides a speed control circuit for a two-way fan. The speed control circuit is provided with a speed control unit and a forward and reverse unit. The main control unit sends an instruction to the forward and reverse switch JK to control the forward and reverse motor M1 to switch to the forward rotation state, control the two-way fan to blow air from the front, or control the forward and reverse motor M1 to switch to the reverse rotation state, control the two-way fan to blow air from the back. Compared with the conventional fan that can only blow air in one direction, it can improve the user's convenience. Only one fan needs to be installed to realize the pumping and sending of air indoors and outdoors; and the main control unit sends an instruction to the speed control unit. The triac of the speed control unit is electrically connected to the LR circuit, and the LR circuit is electrically connected to the voltage regulating capacitor. Then, the forward and reverse motor is speed-controlled by the step-down capacitor method of the voltage regulating capacitor, so as to achieve the purpose of conveniently adjusting the air volume of the two-way fan when blowing air from the front or the back; replacing the relay used in the conventional step-down speed regulator can not only avoid the short circuit and open circuit of the circuit, safely and reliably adjust the air volume of the fan, but also save the installation space.

[0027] (2) The two-way fan provided by the present application is provided with a first blade and a second blade, and controls the first blade to rotate forward for blowing air from the front or controls the second blade to rotate reversely for blowing air from the back through a speed control circuit, so as to achieve the purpose of blowing air from the front and back of the two-way fan; therefore, when the first blade of the two-way fan starts to rotate forward, the indoor air can be discharged outdoors; when the second blade of the two-way fan starts to rotate reversely, the outdoor air can be pumped indoors; there is no need to install multiple fans for indoor and outdoor ventilation, thus improving the convenience of use and saving costs. Description of the Drawings

[0028] Figure 1 It is a block diagram of the working principle in a preferred embodiment of the present utility model;

[0029] Figure 2 It is a circuit control diagram in a preferred embodiment of the present utility model;

[0030] Figure 3 It is a circuit control diagram of the forward and reverse motor M1 part in a preferred embodiment of the present utility model;

[0031] Figure 4 It is a circuit control diagram of the main control unit in a preferred embodiment of the present utility model;

[0032] Figure 5 This is a simplified schematic diagram of the front and back blowing of a two-way fan in a preferred embodiment of the present utility model.

[0033] In the figure:

[0034] 10. Main control unit; 11. Speed regulation unit; 12. Forward and reverse unit; 13. Power supply unit; 14. Oscillating unit; 15. Display unit; 16. Receiving unit;

[0035] 20. Two-way fan. Specific embodiments

[0036] Next, in combination with the accompanying drawings and specific embodiments, the present utility model will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0037] As Figures 1-5 shown, a speed regulation control circuit for a two-way fan 20 includes a main control unit 10 and a speed regulation unit 11, a forward and reverse unit 12, and a power supply unit 13 electrically connected to the main control unit 10. Among them, the main control unit 10 is an AP8505M series single-chip microcomputer chip embedded with a control program, which is used to send instructions to control each functional module.

[0038] The forward and reverse unit 12 has a forward and reverse motor M1 and a forward and reverse switch JK. The forward and reverse switch JK has an S0 terminal, an S1 terminal, and an S2 terminal. The S0 terminal of the forward and reverse switch JK is electrically connected to the N terminal of the power supply unit 13, and both the S1 terminal and the S2 terminal of the forward and reverse switch JK are electrically connected to the first end of the forward and reverse motor M1.

[0039] More specifically, the forward and reverse motor M1 is an AC motor. The forward and reverse motor M1 has a main winding L1 and a secondary winding L2 connected in parallel with each other, and a capacitor C3 connected in series between the main winding L1 and the secondary winding L2. The first ends of the main winding L1 and the capacitor C3 are electrically connected to the S2 terminal of the forward and reverse switch JK, and the first end of the secondary winding L2 and the second end of the capacitor C3 are electrically connected to the S1 terminal of the forward and reverse switch JK; the second ends of the main winding L1 and the secondary winding L2 are both electrically connected to the speed regulation unit 11.

[0040] Therefore, the main control unit 10 sends instructions to the forward and reverse switch JK. According to the above electrical connection relationship between the forward and reverse switch JK and the forward and reverse motor M1, when the S0 terminal and the S1 terminal of the forward and reverse switch JK are connected, the capacitor C3 and the auxiliary winding L2 are energized. The capacitor C3 is a starting capacitor, which can trigger the start of the auxiliary winding L2 and control the forward and reverse motor M1 to run forward. When the S0 terminal and the S2 terminal of the forward and reverse switch JK are connected, the capacitor C3 and the auxiliary winding L1 are energized. The capacitor C3 is a starting capacitor, which can trigger the start of the main winding L1 and control the forward and reverse motor M1 to run in reverse. Thus, the forward and reverse running states of the forward and reverse motor M1 are controlled, and the bidirectional fan 20 can be driven to blow air from the front or the back. Moreover, the AC motor is more adaptable to use in high-temperature and flammable environments than the DC motor, and the use of the AC motor has a better protection effect on the speed regulation unit.

[0041] The speed regulation unit 11 has a number of bidirectional thyristors connected in parallel with each other. The first end of the bidirectional thyristor is electrically connected to the L terminal of the power supply unit 13, the second end is electrically connected to an LR circuit and a voltage regulating capacitor, and the third end is electrically connected to the main control unit 10.

[0042] More specifically, the bidirectional thyristors include bidirectional thyristor T1, bidirectional thyristor T2, and bidirectional thyristor T3, which are electrically connected in parallel with each other. The first ends of the bidirectional thyristor T1, bidirectional thyristor T2, and bidirectional thyristor T3 are electrically connected to the L terminal of the power supply unit 13 for obtaining electrical energy.

[0043] The LR circuit includes inductor LR1, inductor LR2, and inductor LR3. Among them, the second end of the bidirectional thyristor T1 is electrically connected to the first end of the inductor LR1, and the second end of the inductor LR1 is electrically connected to the second end of the forward and reverse motor M1 for controlling and regulating the forward and reverse motor M1 to run at the third gear speed.

[0044] The voltage regulating capacitor includes capacitor C1 and capacitor C2. The second end of the bidirectional thyristor T2 is electrically connected to the first end of the inductor LR2, and the second end of the inductor LR2 is electrically connected to the capacitor C1 and electrically connected to the second end of the forward and reverse motor M1 through the capacitor C1 for controlling and regulating the forward and reverse motor M1 to run at the second gear speed.

[0045] The second end of the bidirectional thyristor T3 is electrically connected to the first end of the inductor LR3, and the second end of the inductor LR3 is electrically connected to the capacitor C2 and electrically connected to the second end of the forward and reverse motor M1 through the capacitor C2 for controlling and regulating the forward and reverse motor M1 to run at the first gear speed.

[0046] The operating speeds of the third gear, second gear, and first gear of the forward and reverse motor M1 decrease in sequence. Thus, the operating speed of the forward and reverse motor M1 is controlled by the speed regulation unit 11. The forward and reverse motor M1 drives the rotation of the two-way fan 20, thereby controlling and regulating the air volume blown by the front or back of the two-way fan 20.

[0047] A resistor R1 is connected to the third terminal of the triac T1 and is electrically connected to the main control unit 10 through this resistor R1. A resistor R2 is connected to the third terminal of the triac T2 and is electrically connected to the main control unit 10 through this resistor R2. A resistor R3 is connected to the third terminal of the triac T3 and is electrically connected to the main control unit 10 through this resistor R3. Therefore, the main control unit 10 sends an instruction to the speed regulation unit 11 to drive the speed regulation unit 11 to control the operating speed of the forward and reverse motor M1.

[0048] In this way, the present application provides a speed regulation control circuit for the two-way fan 20. The speed regulation control circuit is provided with a speed regulation unit 11 and a forward and reverse unit 12. The main control unit 10 sends an instruction to the forward and reverse switch JK to control the forward and reverse motor M1 to switch to the forward rotation state, control the two-way fan 20 to blow air from the front, or control the forward and reverse motor M1 to switch to the reverse rotation state, control the two-way fan 20 to blow air from the back. Compared with the conventional fan that can only blow air in one direction, it can improve the user's convenience. Only one fan needs to be installed to realize the air extraction and delivery indoors and outdoors. Moreover, the main control unit 10 sends an instruction to the speed regulation unit 11. The triac of the speed regulation unit 11 is electrically connected to the LR circuit, and the LR circuit is electrically connected to the voltage regulating capacitor. Then, the forward and reverse motor M1 is speed-regulated by the step-down capacitor method of the voltage regulating capacitor, achieving the purpose of conveniently adjusting the air volume of the two-way fan 20 when blowing air from the front or back. Instead of using a relay in the conventional step-down speed regulator, it can not only avoid short circuits and open circuits in the circuit, safely and reliably regulate the fan air volume, but also save installation space.

[0049] The speed regulation control circuit for the two-way fan 20 provided by the present application further includes a swing unit 14, a display unit 15, and a receiving unit 16 that are electrically connected to the main control unit 10. Among them, the receiving unit 16 is used to receive the signal of the remote controller and feedback the signal to the main control unit 10 to realize the remote control of the two-way fan 20. The display unit 15 uses a display screen. The display unit 15 is installed on the two-way fan 20 and is used to display the operating speed gear and air volume value of the two-way fan 20 according to the instruction of the main control unit 10.

[0050] The shaking head unit 14 has a triac T4 and a shaking head motor M2. The first end of the shaking head motor M2 is electrically connected to the N terminal of the power supply unit 13, and the first end of the triac T4 is electrically connected to the L terminal of the power supply unit 13 for obtaining electric energy; the second end of the triac T4 is electrically connected to the second end of the shaking head motor M2; the third end of the triac T4 is electrically connected to a resistor R4 and is electrically connected to the main control unit 10 through this resistor R4. Therefore, by sending an instruction from the main control unit 10 to the triac T4, the shaking head motor is started to control the two-way fan 20 to shake its head and blow air.

[0051] As Figures 1-4 shown, a two-way fan 20 includes the speed control circuit for the two-way fan 20. The two-way fan 20 is provided with a first blade and a second blade, and the first blade and the second blade are alternately arranged at intervals in the circumferential direction of the rotation output shaft. The two-way fan 20 provided in the embodiment of the present application can adopt a two-way circulation fan or a floor fan.

[0052] Moreover, the blade inclination direction of the first blade is opposite to that of the second blade. When the first blade is controlled to rotate forward by the speed control circuit, the two-way fan 20 can be driven to blow air forward. When the second blade is controlled to rotate forward by the speed control circuit, the two-way fan 20 can be driven to blow air backward. It should be noted that after experimental detection, the setting of the blade inclination direction of the first blade and the setting of the blade inclination direction of the second blade do not affect each other when the two-way fan 20 blows air forward and backward.

[0053] In this way, for the two-way fan 20 provided in the present application, by controlling the first blade to rotate forward to blow air forward through the speed control circuit, or controlling the second blade to rotate backward to blow air backward, the purpose of blowing air on both the front and back sides of the two-way fan 20 is achieved; therefore, when the first blade of the two-way fan 20 is started to rotate forward, the indoor air can be discharged outdoors; when the second blade of the two-way fan 20 is started to rotate backward, the outdoor air can be pumped indoors; there is no need to install multiple fans for indoor and outdoor ventilation, thereby improving the use convenience and saving costs.

[0054] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the protection scope required by the present invention.

Claims

1. A speed control circuit for a two-way fan, characterized in that, It includes a main control unit, a speed regulation unit, a forward and reverse unit, and a power supply unit that are electrically connected to the main control unit. The forward and reverse unit has a forward and reverse motor M1 and a forward and reverse switch JK. The forward and reverse switch JK is electrically connected to the N terminal of the power supply unit and the first end of the forward and reverse motor M1. The speed regulation unit has triacs connected in parallel. The first end of the triac is electrically connected to the L terminal of the power supply unit. The second end of the triac is connected to an LR circuit, and the LR circuit is connected to a voltage regulating capacitor and is electrically connected to the second end of the forward and reverse motor M1 through this voltage regulating capacitor, for driving the forward and reverse motor M1 and controlling and adjusting the rotation speed and blowing air volume of the two-way fan. The third end of the triac is electrically connected to the main control unit. The main control unit sends an instruction to the forward and reverse switch JK, for controlling the forward and reverse motor M1 to switch to the forward rotation state and driving the two-way fan to blow air forward, or switching to the reverse rotation state and driving the two-way fan to blow air backward.

2. The speed control circuit for a two-way fan according to claim 1, wherein, The triac includes triacs T1 - T3. The triacs T1 - T3 are connected in parallel with each other, and the first ends of the triacs T1 - T3 are all electrically connected to the L terminal of the power supply unit. The LR circuit includes inductors LR1 - LR3. The second end of the triac T1 is electrically connected to the first end of the inductor LR1, and the second end of the inductor LR1 is electrically connected to the second end of the forward and reverse motor M1, for controlling and adjusting the forward and reverse motor M1 to operate at the third gear speed. The voltage regulating capacitor includes capacitors C1 and C2. The second end of the triac T2 is electrically connected to the first end of the inductor LR2, and the second end of the inductor LR2 is electrically connected to the capacitor C1 and is electrically connected to the second end of the forward and reverse motor M1 through this capacitor C1, for controlling and adjusting the forward and reverse motor M1 to operate at the second gear speed. The second end of the triac T3 is electrically connected to the first end of the inductor LR3, and the second end of the inductor LR3 is electrically connected to the capacitor C2 and is electrically connected to the second end of the forward and reverse motor M1 through this capacitor C2, for controlling and adjusting the forward and reverse motor M1 to operate at the first gear speed.

3. The speed control circuit for a two-way fan according to claim 2, wherein, The third end of the triac T1 is connected to a resistor R1 and is electrically connected to the main control unit through this resistor R1. The third end of the triac T2 is connected to a resistor R2 and is electrically connected to the main control unit through this resistor R2. The third end of the triac T3 is connected to a resistor R3 and is electrically connected to the main control unit through this resistor R3.

4. The speed control circuit for a two-way fan according to claim 1, characterized in that, The forward and reverse switch JK has an S0 terminal, an S1 terminal, and an S2 terminal. The forward and reverse motor M1 is an AC motor. The forward and reverse motor M1 has a main winding L1, a secondary winding L2 that are electrically connected in parallel to each other, and a capacitor C3 connected in series between the main winding L1 and the secondary winding L2. The first ends of the main winding L1 and the capacitor C3 are electrically connected to the S2 end of the forward and reverse switch JK. The first end of the secondary winding L2 and the second end of the capacitor C3 are electrically connected to the S1 end of the forward and reverse switch JK. The second ends of the main winding L1 and the secondary winding L2 are both electrically connected to the LR circuit at the second end of the bidirectional thyristor. The S0 end of the forward and reverse switch JK is electrically connected to the N end of the power supply unit. When the S0 end of the forward and reverse switch JK is connected to the S1 end, the capacitor C3 and the secondary winding L2 are energized, which is used to trigger and start the forward and reverse motor M1 to rotate forward. When the S0 end of the forward and reverse switch JK is connected to the S2 end, the capacitor C3 and the secondary winding L1 are energized, which is used to trigger and start the forward and reverse motor M1 to rotate in reverse.

5. The speed control circuit for a two-way fan according to any one of claims 1-4, characterized in that, It includes a shaking head unit electrically connected to the main control unit. The shaking head unit has a bidirectional thyristor T4 and a shaking head motor M2. The first end of the bidirectional thyristor T4 is electrically connected to the L end of the power supply unit. The second end of the bidirectional thyristor T4 is electrically connected to the second end of the shaking head motor M2. The first end of the shaking head motor M2 is electrically connected to the N end of the power supply unit, which is used to control the bidirectional fan to shake its head and blow air.

6. The speed control circuit for a two-way fan according to claim 5, characterized in that, The third end of the bidirectional thyristor T4 is electrically connected to a resistor R4 and is electrically connected to the main control unit through this resistor R4.

7. The speed control circuit for a two-way fan according to any one of claims 1-4, characterized in that It includes a display unit electrically connected to the main control unit, which is used to display the gear position and air volume value of the bidirectional fan according to the instructions of the main control unit.

8. The speed control circuit for a two-way fan according to any one of claims 1-4, characterized in that It includes a receiving unit electrically connected to the main control unit, which is used to receive the signal of the remote controller and feedback this signal to the main control unit.

9. A two-way fan, characterized in that, It includes a speed control circuit for a bidirectional fan according to any one of claims 1 to 8.

10. The two-way fan according to claim 9, characterized in that, The bidirectional fan has a first blade and a second blade. The first blade and the second blade are alternately arranged at intervals in the circumferential direction of the rotation output shaft. And the inclination direction of the blades of the first blade is opposite to the inclination direction of the blades of the second blade, which is used to control the first blade to rotate forward for blowing air from the front or control the second blade to rotate in reverse for blowing air from the back through the speed control circuit.

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