Cooling fan capable of being quickly started and stopped

Abstract

The cooling fan comprises a shell, a direct-current brushless motor and a control module, the direct-current brushless motor and the control module are sequentially arranged on the shell, the input end of the control module is externally connected with a power source, the output end of the control module is connected into the direct-current brushless motor, and the direct-current brushless motor is connected with the control module. The control module comprises an inclination angle switch and a response module, the inclination angle switch is used for detecting the inclination angle of the direct-current brushless motor, the response module is electrically connected with the inclination angle switch, and the response module is used for controlling the working state of the direct-current brushless motor. The control method has the effect of conveniently controlling the start and stop of the cooling fan.

Description

Technical Field

[0001] The present application relates to the field of cooling fans, and in particular to a cooling fan with fast start and stop. Background Art

[0002] Brushless DC motor cooling fans (hereinafter referred to as fans) have the advantages of high efficiency, low noise and controllable speed. They are widely used in home appliances, electronic equipment, computer hardware, automotive electronics and industrial equipment to improve heat dissipation and ensure long-term stable operation of equipment.

[0003] When the fan is tilted, the uneven distribution of liquid may cause steam or liquid to enter the motor components, which may damage the fan motor, reduce its life or even cause a short circuit. To avoid this, many fans are equipped with a tilt sensor or safety switch, which automatically stops the fan when it is tilted to protect the motor and extend its service life.

[0004] In order to solve the above problems, in actual applications, a mechanical switch (usually a gravity ball switch) is connected in series to the power supply circuit of the fan, and then the power supply circuit is connected to the power supply, and the fan is powered by the power supply. When the fan is tilted to a certain angle, the ball inside the mechanical switch is displaced under the action of gravity, causing the power supply circuit to be disconnected, thereby stopping the fan; however, in this process, the current passing through the mechanical switch is the same as the current passing through the fan, which is electrically a method of directly controlling high voltage and high current with large current, which poses certain safety hazards and needs further improvement. Utility Model Content

[0005] In order to facilitate the control of the start and stop of the cooling fan, the present application provides a cooling fan with fast start and stop.

[0006] The application provides a fast start-stop cooling fan adopts the following technical solution:

[0007] A fast start-stop cooling fan comprises a shell, a brushless DC motor and a control module, wherein the brushless DC motor and the control module are sequentially arranged on the shell, an input end of the control module is externally connected to a power supply, and an output end of the control module is connected to the brushless DC motor, the control module comprises a tilt angle switch and a response module, the tilt angle switch is used to detect the tilt angle of the brushless DC motor, the response module is electrically connected to the tilt angle switch, and the response module is used to control the working state of the brushless DC motor.

[0008] By adopting the above technical solution, since the control module and the DC brushless motor are respectively arranged on the shell, the tilt angle of the tilt angle switch is the same as the tilt angle of the DC brushless motor. When the tilt angle switch detects that the DC brushless motor is tilted, the tilt angle switch provides a signal to the response module. When the response module receives the signal, it quickly takes action to put the circuit located behind the response module into a cut-off state, thereby stopping the DC brushless motor from working. Compared with the use of a mechanical switch, the present application uses a response module to control the DC brushless motor to form an electronic switch with a faster response speed, thereby achieving the purpose of using a small current to control a high voltage and a large current, and facilitating the control of the start and stop of the cooling fan.

[0009] Preferably, the response module includes an adjustment circuit and a response circuit, the input end of the adjustment circuit is connected to a power supply, the output end of the adjustment circuit is connected to the response circuit, the output end of the response circuit is connected to the input end of the DC brushless motor, and the adjustment circuit is used to adjust the current input to the response circuit.

[0010] By adopting the above technical solution, the current input to the response circuit is adjusted through the adjustment circuit to reduce (or filter out) high-frequency noise and ripple in the power supply, thereby reducing the impact of high-frequency noise and / or ripple on the normal operation of the response circuit.

[0011] Preferably, the response circuit includes a P-MOS tube, a source of the P-MOS tube is connected to the output end of the adjustment circuit, a drain of the P-MOS tube is connected to the input end of the DC brushless motor, one end of the tilt angle switch is connected to the output end of the adjustment circuit, and the other end of the tilt angle switch is connected to the gate of the P-MOS tube.

[0012] By adopting the above technical solution, using the P-MOS tube as an electronic switch, the on-off control of the subsequent circuit can be achieved by controlling the on and off of the P-MOS tube, and the tilt angle switch only plays a role in signal detection; and the mechanical switch is prone to generate electric sparks during the on-off process, thereby causing irreversible mechanical loss to the mechanical switch. Through the cooperation of the P-MOS tube and the tilt angle switch, the above problem can be well solved, so that the cooling fan can maintain normal operation under low temperature, humid or flammable conditions.

[0013] Preferably, the response module further includes a transient voltage suppression circuit, one end of the transient voltage suppression circuit is grounded, and the other end of the transient voltage suppression circuit is connected to the output end of the adjustment circuit.

[0014] By adopting the above technical solution, the addition of the transient voltage suppression circuit provides additional protection for the circuit. When transient voltages appear in the circuit, the circuit can respond quickly and suppress these voltages, thereby reducing the damage caused by the front-stage circuit and / or the back-stage short circuit, which is beneficial to improving the stability and reliability of the system, thereby playing a positive guiding role in increasing the service life of the cooling fan.

[0015] Preferably, the response circuit further includes a filter circuit, one end of the filter circuit is grounded, and the other end of the filter circuit is connected to the drain of the P-MOS tube.

[0016] By adopting the above technical solution, the introduction of the filtering circuit helps to reduce noise and interference signals in the circuit, improve the purity and stability of the circuit signal, and is beneficial to improving the overall performance of the system.

[0017] Preferably, a mounting plate is mounted on the shell, and the mounting plate is used to fix the brushless DC motor. A accommodating groove is provided along the circumferential side wall of the mounting plate to the geometric center of the mounting plate, and the accommodating groove is used to accommodate the wire. The control module is arranged on the mounting plate, and the control module passes through the mounting plate and faces the accommodating groove.

[0018] By adopting the above technical solution, the design of the mounting plate not only provides a stable support for the brushless DC motor, but also can hide the wires through the receiving groove, reduce the amount of wire leakage, and make the entire internal structure more neat and beautiful. In addition, the design of the control module running through the mounting plate and facing the receiving groove facilitates the installation and maintenance of the control module.

[0019] Preferably, the mounting plate is provided with a plurality of hollow portions.

[0020] By adopting the above technical solution, a plurality of hollow parts are opened on the mounting plate, which can further reduce the overall mass of the mounting plate while maintaining the overall rigidity of the mounting plate, thereby playing a positive guiding role in reducing the overall mass of the cooling fan.

[0021] Preferably, the side wall of the mounting plate along the circumferential direction is provided with a plurality of clamping parts, and the clamping parts are clamped and matched with the shell.

[0022] By adopting the above technical solution, the connection between the mounting plate and the housing is made more firm and reliable. This snap-fitting method not only simplifies the installation process, but also improves the overall structural strength of the device. In addition, the design of the snap-fit ​​part also facilitates the disassembly and maintenance of the cooling fan.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. This application uses a response module to control a brushless DC motor to form an electronic switch with a fast response speed, so as to achieve the purpose of using a small current to control a high voltage and a large current, and to facilitate the control of the start and stop of the cooling fan;

[0025] 2. Use P-MOS tube as an electronic switch. By controlling the on and off of the P-MOS tube, the on and off of the subsequent circuit can be controlled, so that the cooling fan can maintain normal operation under low temperature, humid or flammable conditions;

[0026] 3. The wires are hidden by the receiving groove to reduce the amount of wire leakage. At the same time, the control module is set on the mounting plate, penetrates the mounting plate and extends into the receiving groove, so as to facilitate the installation of the control module on the mounting plate or the removal of the control module along the mounting plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a fast start and stop cooling fan in an embodiment of the present application.

[0028] Figure 2 It is a circuit schematic diagram of a response module in a fast start-stop cooling fan in an embodiment of the present application.

[0029] Explanation of the reference numerals in the accompanying drawings: 1. cooling fan; 2. housing; 3. brushless DC motor; 4. control module; 41. tilt angle switch; 42. response module; 421. adjustment circuit; 422. response circuit; 423. transient voltage suppression circuit; 5. filter circuit; 6. mounting plate; 7. receiving groove; 8. fan blade; 9. hollow portion; 10. snap-fit ​​portion; 11. concave cavity; 12. stand; 121. base; 122. support leg; 13. snap-fit ​​piece; 14. ventilation hole. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-2 This application is described in further detail.

[0031] The embodiment of the present application discloses a cooling fan 1 that can be started and stopped quickly. Figure 1 and Figure 2 A fast start-stop cooling fan 1 includes a housing 2, a brushless DC motor 3 and a control module 4. The brushless DC motor 3 and the control module 4 are sequentially arranged on the housing 2. The input end of the control module 4 is connected to an external power supply, and the output end of the control module 4 is connected to the brushless DC motor 3. The control module 4 includes a tilt angle switch 41 and a response module 42. The tilt angle switch 41 is used to detect the tilt angle of the brushless DC motor 3. The response module 42 is electrically connected to the tilt angle switch 41. The response module 42 is used to control the working state of the brushless DC motor 3.

[0032] First of all, it should be noted that the tilt angle switch 41 and the response module 42 are integrated on the same circuit substrate and then packaged to reduce the probability of the tilt angle switch 41 and the response module 42 being subjected to physical and / or chemical corrosion, thereby improving the stability of the control module 4 during operation.

[0033] Specifically, refer to Figure 1 A mounting plate 6 is mounted on the shell 2, and the mounting plate 6 is used to fix the DC brushless motor 3. A receiving groove 7 is provided along the circumferential side wall of the mounting plate 6 to the geometric center of the mounting plate 6, and the receiving groove 7 is used to receive the wire. The control module 4 is arranged on the mounting plate 6, and the control module 4 passes through the mounting plate 6 and faces the receiving groove 7.

[0034] Furthermore, the shell 2 is recessed from its geometric center to the edge to form a cavity 11, and a stand 12 is arranged in the cavity 11, and the stand 12 is integrally formed with the shell 2. The stand 12 includes a base 121 and three legs 122, the cross-sectional shape of the base 121 is circular, the base 121 is located at the bottom of the cavity 11, the three legs 122 are evenly distributed along the circumference of the base 121, and the fixed ends of the three legs 122 are integrally formed with the base 121, and the mounting plate 6 is fixedly connected to the shell 2 through the three legs 122. At the same time, a plurality of ventilation holes 14 are opened along the bottom of the cavity 11 and penetrate the shell 2 (the number is large and the functions are the same, and the number is not limited here), and the ventilation holes 14 are used to achieve air circulation.

[0035] At the same time, the DC brushless motor 3 is installed on the mounting plate 6 along the geometric center of the mounting plate 6, and the output shaft of the DC brushless motor 3 faces the concave cavity 11. The output shaft of the DC brushless motor 3 is coaxially fixed with a fan blade 8. When the output shaft of the DC brushless motor 3 rotates, the fan blade 8 rotates synchronously with the output shaft of the DC brushless motor 3.

[0036] Correspondingly, a plurality of hollow portions 9 are provided on the mounting plate 6, and the number and shape of the hollow portions 9 need to be set according to the shape of the mounting plate 6. Their function is to further reduce the overall mass of the mounting plate 6 while maintaining the overall rigidity of the mounting plate 6, thereby playing a positive guiding role in reducing the overall mass of the cooling fan 1.

[0037] On the other hand, refer to Figure 1 The mounting plate 6 is provided with a plurality of clamping parts 10 along the circumferential side wall, and the clamping parts 10 are clamped and matched with the housing 2 .

[0038] Specifically, the number of the clamping parts 10 is the same as the number of the supporting legs 122. A U-shaped opening is provided on the clamping part 10, and a clamping part 13 is installed on the supporting leg 122. The clamping part 13 has a clamping groove along the circumferential side wall. The clamping part 10 is clamped with the clamping groove through the U-shaped opening. The groove width of the clamping groove is the same as the thickness of the clamping part 10, so that the tolerance matching relationship between the clamping groove and the U-shaped opening is over-fitting, reducing the probability of the clamping part 10 falling off along the clamping groove. When the clamping part 10 is clamped with the clamping groove, the clamping part 13 can be installed on the supporting leg 122, thereby achieving the purpose of fixedly connecting the mounting plate 6 and the shell 2, and also facilitating the disassembly of the mounting plate 6 along the shell 2.

[0039] Reference Figure 1 And circuit principle Figure 2 As shown in the circuit schematic diagram, the response module 42 includes an adjustment circuit 421 and a response circuit 422. The input end of the adjustment circuit 421 is connected to the power supply, the output end of the adjustment circuit 421 is connected to the response circuit 422, and the output end of the response circuit 422 is connected to the input end of the DC brushless motor 3. The adjustment circuit 421 is used to adjust the current of the input response circuit 422.

[0040] Specifically, the adjustment circuit 421 includes an inductor T1 and a diode D1, one end of the inductor T1 is connected to the power supply, the other end of the inductor T1 is connected to the positive electrode of the diode D1, and the negative electrode of the diode D1 is connected to the response circuit 422. When current flows through the inductor T1, the inductor T1 has an obstruction effect on alternating current, but has a smaller obstruction effect on direct current. The high-frequency noise in the current signal is filtered out by the inductor T1 to retain the low-frequency signal, so as to input a more stable direct current or low-frequency signal to the subsequent circuit.

[0041] At the same time, when the current reaches the diode D1 after passing through the inductor T1, the diode D1 has unidirectional conductivity to prevent the current from flowing in the opposite direction. Under the forward voltage, the diode D1 is turned on, the inductor T1 is in a stable magnetic field state, and the output voltage will remain stable; under the negative voltage, the diode D1 is cut off, and the inductor T1 generates a reverse potential through self-inductance, which plays a role in offsetting the input voltage change, maintaining the stability of the output voltage, and playing a positive guiding role in maintaining the normal operation of the response circuit 422.

[0042] Correspondingly, refer to Figure 1 and Figure 2 The response module 42 further includes a transient voltage suppression circuit 423 , one end of the transient voltage suppression circuit 423 is grounded, and the other end of the transient voltage suppression circuit 423 is connected to the output end of the adjustment circuit 421 .

[0043] Specifically, the transient voltage suppression circuit 423 is configured as a diode D2, the positive electrode of the diode D2 is grounded, and the negative electrode of the diode D2 is connected to the negative electrode of the diode D1. When a transient voltage appears in the front-stage circuit and / or the back-stage circuit (such as a temporary overvoltage phenomenon caused by lightning strikes, electromagnetic interference, power switches, etc.), the diode D2 responds quickly. The diode D2 has a high reverse breakdown voltage. If the voltage in the circuit exceeds the threshold of the diode D2, the diode D2 will immediately change from a reverse cutoff state to a conducting state, thereby directing the excessive voltage to the ground line or the power line, reducing the probability of the voltage surge causing damage to the response circuit 422 and / or the DC brushless motor 3.

[0044] Reference Figure 1 And circuit principle Figure 2 The response circuit 422 includes a P-MOS tube, the source of the P-MOS tube is connected to the output end of the adjustment circuit 421, the drain of the P-MOS tube is connected to the input end of the DC brushless motor 3, one end of the tilt angle switch 41 is connected to the output end of the adjustment circuit 421, and the other end of the tilt angle switch 41 is connected to the gate of the P-MOS tube.

[0045] First of all, it should be noted that the working principle of the tilt angle switch 41 is based on the output signal of the tilt sensor, that is, when the DC brushless motor 3 is at a specific angle (for example, horizontal state), the tilt sensor will output a reference signal. If in the subsequent process, the tilt sensor detects that the angle has changed, the output signal will also change synchronously. It is an existing detection component, and its specific composition, model, and working principle are not described here. At the same time, the detection angle of the tilt angle switch 41 can be selected at 15° (angle), 30°, 45° or 60° to adapt to the detection requirements of different tilt angles. In this embodiment, preferably, the detection angle of the tilt switch is 15°.

[0046] Specifically, a resistor R1 is connected in series between the tilt angle switch 41 and the diode D1. When the tilt angle switch 41 is turned on, the current flowing into the tilt angle switch 41 increases instantaneously. The current flowing into the tilt angle switch 41 is limited by the resistor R1, thereby reducing the probability of the tilt angle switch 41 being damaged due to excessive current flowing into the tilt angle switch 41 instantaneously.

[0047] Furthermore, when the tilt angle switch 41 does not detect a tilt signal, the tilt angle switch 41 is in an on state, at which time the gate of the P-MOS tube is in a low level state, and the current flows to the source of the P-MOS tube through the cathode of the diode D1, and flows to the drain of the P-MOS tube through the source of the P-MOS tube, forming a loop. At this time, the DC brushless motor 3 is in a normal working state.

[0048] Correspondingly, when the tilt angle switch 41 detects that the tilt angle of the DC brushless motor 3 has changed, the tilt angle switch 41 will be quickly turned on, thereby achieving the purpose of providing an electrical signal to the P-MOS tube. The current passes through the tilt angle switch 41 along the negative electrode of the diode D1 and reaches the gate of the P-MOS tube. At this time, the gate of the P-MOS tube is in a high level state, that is, the P-MOS tube is in a cut-off state, and the current cannot flow through the P-MOS tube to the DC brushless motor 3, thereby stopping the DC brushless motor 3 from working.

[0049] Through the above process, compared with the method of using a mechanical switch, the role of the tilt angle switch 41 in the circuit is to provide an electrical signal to the P-MOS tube, thereby realizing the control of the conduction and cutoff of the P-MOS tube, and the P-MOS tube and the tilt angle switch 41 cooperate with each other, with a high response speed, which is conducive to improving the timeliness of the power on and off of the DC brushless motor 3; at the same time, compared with the mechanical switch, the present application uses the response module 42 to control the DC brushless motor 3 to form an electronic switch, which has a fast response speed and does not generate electric sparks, so that the cooling fan 1 can maintain normal operation in low temperature, humid or flammable working conditions. The purpose of using a small current to control high voltage and large current is achieved, which is convenient for controlling the start and stop of the cooling fan 1.

[0050] Reference Figure 1 And circuit principle Figure 2 The response circuit 422 further includes a filter circuit 5, one end of the filter circuit 5 is grounded, and the other end of the filter circuit 5 is connected to the drain of the P-MOS tube.

[0051] Specifically, the filter circuit 5 includes a filter capacitor C4 and a resistor R3. One end of the filter capacitor C4 is grounded, and the other end of the filter capacitor C4 is connected to one end of the resistor R3. Meanwhile, the other end of the resistor R3 is connected to the drain of the P-MOS tube.

[0052] Its function is that at the moment when the P-MOS tube is turned on and off, since the inductance in the brushless DC motor 3 cannot change suddenly, a back electromotive force will be generated, thereby forming a spike voltage at the drain of the P-MOS tube. When the spike voltage exceeds the withstand voltage limit of the P-MOS tube, the P-MOS tube will be damaged. Therefore, a release loop is formed by the capacitor C4 and the resistor R3, thereby suppressing the spike voltage, which is beneficial to prolonging the service life of the P-MOS tube.

[0053] Meanwhile, the capacitor C4 has a filtering effect to filter out high-frequency noise and signal interference in the circuit, and plays a positive guiding role in improving the stability of the brushless DC motor 3 during operation.

[0054] The implementation principle of a fast start-stop cooling fan 1 in the embodiment of the present application is as follows: the brushless DC motor 3 is installed on the housing 2 through the mounting plate 6, so that the brushless DC motor 3 can stably rotate along the housing 2. When the tilt angle switch 41 does not detect the tilt signal, the tilt angle switch 41 is in the on state. At this time, the gate of the P-MOS tube is in a low level state, and the current flows to the source of the P-MOS tube through the cathode of the diode D1, and flows to the drain of the P-MOS tube through the source of the P-MOS tube to form a loop. At this time, the brushless DC motor 3 is in normal operation. When the tilt angle switch 41 detects that the tilt angle of the DC brushless motor 3 has changed, the tilt angle switch 41 will be quickly turned on, thereby providing an electrical signal to the P-MOS tube. The current flows along the cathode of the diode D1 through the tilt angle switch 41 and reaches the gate of the P-MOS tube. At this time, the gate of the P-MOS tube is in a high level state, that is, the P-MOS tube is in a cut-off state, and the current cannot flow through the P-MOS tube to the DC brushless motor 3, thereby stopping the DC brushless motor 3, which is convenient for controlling the start and stop of the cooling fan 1.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fast start-stop cooling fan (1), characterized in that: The invention comprises a housing (2), a brushless DC motor (3) and a control module (4), wherein the brushless DC motor (3) and the control module (4) are arranged on the housing (2) in sequence, an input end of the control module (4) is connected to an external power supply, and an output end of the control module (4) is connected to the brushless DC motor (3), and the control module (4) comprises a tilt angle switch (41) and a response module (42), wherein the tilt angle switch (41) is used to detect the tilt angle of the brushless DC motor (3), and the response module (42) is electrically connected to the tilt angle switch (41), and the response module (42) is used to control the working state of the brushless DC motor (3).

2. A fast start-stop cooling fan (1) according to claim 1, characterized in that: The response module (42) comprises an adjustment circuit (421) and a response circuit (422); the input end of the adjustment circuit (421) is connected to a power supply; the output end of the adjustment circuit (421) is connected to the response circuit (422); the output end of the response circuit (422) is connected to the input end of the DC brushless motor (3); and the adjustment circuit (421) is used to adjust the current input to the response circuit (422).

3. A fast start-stop cooling fan (1) according to claim 2, characterized in that: The response circuit (422) comprises a P-MOS tube, the source of the P-MOS tube is connected to the output end of the adjustment circuit (421), the drain of the P-MOS tube is connected to the input end of the DC brushless motor (3), one end of the tilt angle switch (41) is connected to the output end of the adjustment circuit (421), and the other end of the tilt angle switch (41) is connected to the gate of the P-MOS tube.

4. A fast start-stop cooling fan (1) according to claim 3, characterized in that: The response module (42) further comprises a transient voltage suppression circuit (423), one end of the transient voltage suppression circuit (423) is grounded, and the other end of the transient voltage suppression circuit (423) is connected to the output end of the adjustment circuit (421).

5. A fast start-stop cooling fan (1) according to claim 4, characterized in that: The response circuit (422) further comprises a filter circuit (5), one end of the filter circuit (5) is grounded, and the other end of the filter circuit (5) is connected to the drain of the P-MOS tube.

6. A fast start-stop cooling fan (1) according to claim 1, characterized in that: A mounting plate (6) is mounted on the housing (2), and the mounting plate (6) is used to fix the brushless DC motor (3). A receiving groove (7) is provided along the circumferential side wall of the mounting plate (6) to the geometric center of the mounting plate (6), and the receiving groove (7) is used to receive the wire. The control module (4) is arranged on the mounting plate (6), and the control module (4) passes through the mounting plate (6) and faces the receiving groove (7).

7. A fast start-stop cooling fan (1) according to claim 6, characterized in that: The mounting plate (6) is provided with a plurality of hollow portions (9).

8. A fast start-stop cooling fan (1) according to claim 7, characterized in that: The mounting plate (6) is provided with a plurality of clamping parts (10) along the circumferential side wall, and the clamping parts (10) are clamped and matched with the housing (2).

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