Air conditioner outdoor fan against wind starting control device and air conditioning equipment

Abstract

The application discloses an air conditioner outer fan adverse wind starting control device and air conditioner equipment. The device comprises: a main control chip, a wind direction detection component, a rotating speed detection component, a state judgment circuit and a brake component; the wind direction detection component is connected to the main control chip and is used for detecting the rotating direction of a fan blade; the rotating speed detection component is connected to the main control chip and is used for detecting the rotating speed of the fan blade; the state judgment circuit is connected to the main control chip and is used for judging whether the state of the fan blade reverse rotation and the rotating speed greater than a preset rotating speed is sustained for a preset time, and outputting a control signal when the judgment result is yes; the brake component is installed to the hub of the fan blade and is connected to the state judgment circuit, and is used for braking the fan blade under the drive of the control signal; the main control chip is used for cutting off the starting action of the outer fan under the drive of the control signal, and restarting the outer fan when the rotating speed of the fan blade is reduced to less than or equal to the preset rotating speed. The application reduces the risk of the outer fan adverse wind starting and guarantees the reliability of the adverse wind starting.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and in particular, relates to an air conditioner outer fan adverse wind starting control device and air conditioning equipment. BACKGROUND

[0002] At present, when the air conditioner starts to run, the outer fan will start first. Since the outer fan is placed outdoors, it is possible that when the air conditioner starts, the outdoor wind will be opposite to the current fan direction, especially in typhoon weather, the air conditioner faces a very serious adverse wind starting problem. When the reverse wind speed is large, the current during starting will be large, thereby causing the IPM (Intelligent Power Module) to heat, and in severe cases, it will cause circuit damage and motor damage.

[0003] In view of the problem in the prior art that the adverse wind starting of the air conditioner outer fan leads to overvoltage and overcurrent, causing circuit damage and affecting the reliability of starting and the service life of the motor, no effective solution has been proposed so far. SUMMARY

[0004] The embodiments of the present application provide an air conditioner outer fan adverse wind starting control device and air conditioning equipment to at least solve the problem in the prior art that the adverse wind starting of the air conditioner outer fan leads to overvoltage and overcurrent, causing circuit damage and affecting the reliability of starting and the service life of the motor.

[0005] To solve the above technical problems, the embodiments of the present application provide an air conditioner outer fan adverse wind starting control device, comprising: a main control chip, a wind direction detection component, a rotating speed detection component, a state judgment circuit and a braking component;

[0006] The wind direction detection component is connected to the main control chip and is used to detect the rotating direction of the outer fan blade;

[0007] The rotating speed detection component is connected to the main control chip and is used to detect the rotating speed of the outer fan blade;

[0008] The state judgment circuit is connected to the main control chip and is used to judge whether the state of the reverse rotation of the blade and the rotating speed greater than the preset rotating speed is sustained for a preset time, and output a control signal in the case of yes;

[0009] The braking component is installed to the hub of the blade and is connected to the state judgment circuit, and is used to brake the blade under the driving of the control signal;

[0010] The main control chip is used to cut off the starting action of the outer fan under the driving of the control signal, and restart the outer fan when the rotating speed of the blade is reduced to less than or equal to the preset rotating speed.

[0011] Optionally, the state judging circuit comprises a comparison circuit and a delay circuit.

[0012] An input end of the comparison circuit is connected to the master control chip.

[0013] An input end of the delay circuit is connected to an output end of the comparison circuit.

[0014] An output end of the delay circuit is connected to the master control chip and the brake component.

[0015] The comparison circuit is configured to receive a wind direction signal and a rotating speed signal from the master control chip, compare a current rotating speed of the fan blade with a preset rotating speed in the case that the fan blade reversely rotates, and output a signal corresponding to a comparison result.

[0016] The delay circuit is configured to judge whether the state that the fan blade reversely rotates and the rotating speed is greater than the preset rotating speed lasts for a preset time, and output a signal corresponding to a judgment result.

[0017] Optionally, the comparison circuit comprises a comparator.

[0018] A positive phase input end of the comparator is connected to a first output end of the master control chip through a first resistor, and the first output end of the master control chip is configured to output a rotating speed signal.

[0019] A negative phase input end of the comparator is connected to a second output end of the master control chip through a second resistor and a first switch tube in sequence, the second output end of the master control chip is configured to output a wind direction signal, and the first switch tube is turned on when the wind direction signal output by the second output end of the master control chip indicates that the fan blade reversely rotates.

[0020] The negative phase input end of the comparator is also grounded through a third resistor.

[0021] An output end of the comparator serves as an output end of the comparison circuit.

[0022] Optionally, a first pole of the first switch tube is connected to the second output end of the master control chip, a second pole of the first switch tube is connected to a power supply, a third pole of the first switch tube is connected to the negative phase input end of the comparator through the second resistor, and the third pole of the first switch tube is also grounded through a fourth resistor.

[0023] Optionally, the delay circuit comprises an operational amplifier.

[0024] A positive phase input end of the operational amplifier is connected to the output end of the comparison circuit through a fifth resistor and a second switch tube in sequence, and the second switch tube is turned on when the signal output by the comparison circuit indicates that the current rotating speed of the fan blade is greater than the preset rotating speed.

[0025] The inverting input end of the operational amplifier is grounded;

[0026] The output end of the operational amplifier is connected to the non-inverting input end of the operational amplifier through a capacitor;

[0027] The output end of the operational amplifier is also connected to the master chip and the brake component.

[0028] Optionally, the first pole of the second switch tube is connected to the output end of the comparison circuit, the second pole of the second switch tube is connected to a power supply, the third pole of the second switch tube is connected to the non-inverting input end of the operational amplifier through the fifth resistor, and the third pole of the second switch tube is also grounded through a sixth resistor.

[0029] Optionally, the output end of the state judgment circuit is connected to the brake component through a third switch tube and a relay in sequence, and the third switch tube is turned on when the state judgment circuit outputs the control signal; the first pole of the third switch tube is connected to the output end of the state judgment circuit, the second pole of the third switch tube is connected to a power supply, the third pole of the third switch tube is connected to the brake component through the relay, and the third pole of the third switch tube is also grounded through a seventh resistor.

[0030] Optionally, the brake component comprises a first brake pad and a second brake pad, the first end of the first brake pad is mounted to the first surface of the hub, the first end of the second brake pad is mounted to the second surface of the hub, the first surface is opposite to the second surface, and the second end of the first brake pad and the second end of the second brake pad are connected through a brake line.

[0031] Optionally, the alarm component is further connected to the output end of the state judgment circuit, and is used for prompting the situation that the wind blade continuously meets the reverse rotation and the rotating speed is greater than the preset rotating speed for a preset time under the driving of the control signal.

[0032] Optionally, the wind direction detection component is mounted to the side frame of the outer fan, and the wind direction detection component is a voltage type wind direction sensor, a photoelectric type wind direction sensor or an electronic compass type wind direction sensor; and the rotating speed detection component is a Hall rotating speed sensor, a photoelectric type wind speed sensor, a mechanical type wind speed sensor or an ultrasonic type wind speed sensor.

[0033] The embodiment of the application further provides an air conditioner device, which comprises the air conditioner outer fan adverse wind starting control device.

[0034] The technical scheme of the present application is applied to detect the rotating direction and rotating speed of the fan blade of the external fan by the wind direction detection component and the rotating speed detection component when starting the external fan, to judge whether the state of the fan blade rotating reversely and the rotating speed being greater than the preset rotating speed is sustained for a preset time by the state judgment circuit, to cut off the starting action of the external fan and trigger the brake component to brake the fan blade in time when the fan blade is detected to be continuously rotating reversely and the rotating speed is large, so as to cause the external fan to be unable to start reliably, to reduce the rotating speed of the fan blade until the rotating speed of the fan blade is reduced to below the preset rotating speed, and to restart the external fan when the reliable starting condition is met, thereby reducing the risk existing when the external fan is started in adverse wind, avoiding the circuit from being damaged due to overcurrent and overvoltage when the external fan is started in adverse wind, avoiding the air conditioner from being out of step due to starting in adverse wind, ensuring the reliable starting of the external fan, improving the reliability of the air conditioner external fan starting in adverse wind, and prolonging the service life of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of an air conditioner external fan adverse wind starting control device provided by an embodiment of the present application;

[0036] Figure 2 is a schematic diagram of an external fan provided by an embodiment of the present application;

[0037] Figure 3 is a schematic diagram of the installation of a brake component provided by an embodiment of the present application;

[0038] Figure 4 is a schematic diagram of a brake component provided by an embodiment of the present application;

[0039] Figure 5 is a specific schematic diagram of an external fan adverse wind starting control device provided by an embodiment of the present application;

[0040] Figure 6 is a control flowchart of external fan adverse wind starting provided by an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0042] It is to be understood that the terminology "first", "second", and the like used in the specification and the claims of the application is merely intended to distinguish between similar objects and not necessarily for describing a specific sequential or chronological order. It is to be understood that the use of such terms can be interchanged, in appropriate instances, so that the embodiments of the application described herein can be practiced in the sequence other than that which has been set forth herein. Furthermore, the terms "comprise" and "comprising" and any variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, system, product or apparatus that comprises a list of steps or elements does not necessarily comprise only those steps or elements but can include additional steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0043] Optional embodiments of the application will be described in detail below with reference to the attached drawings.

[0044] The application provides an air conditioner outer fan adverse wind starting control device, Figure 1 is a schematic diagram of the air conditioner outer fan adverse wind starting control device provided by the application, as Figure 1 shown, the device comprises a main control chip 10, a wind direction detection component 20, a rotating speed detection component 30, a state judgment circuit 40 and a braking component 50.

[0045] The wind direction detection component 20 is connected to the main control chip 10 and is used for detecting the rotating direction of the outer fan blade. The rotating speed detection component 30 is connected to the main control chip 10 and is used for detecting the rotating speed of the outer fan blade. Specifically, the main control chip 10 sends a starting instruction to the outer fan, at which time the wind direction detection component 20 and the rotating speed detection component 30 start detection.

[0046] The state judgment circuit 40 is connected to the main control chip 10 and is used for judging whether the state of the blade rotating reversely and the rotating speed being greater than a preset rotating speed lasts for a preset time, and outputting a control signal in the case of yes.

[0047] The braking component 50 is installed to the hub of the blade and is connected to the state judgment circuit 40 and is used for braking the blade under the driving of the control signal. The hub is a component used for supporting the blade and rotates together with the blade.

[0048] The main control chip 10 is used for cutting off the starting action of the outer fan under the driving of the control signal, and restarting the outer fan (i.e. the main control chip 10 sends a starting instruction to the outer fan again) when the rotating speed of the blade is reduced to less than or equal to the preset rotating speed.

[0049] The preset rotation speed is a reverse rotation speed value that does not affect the reliability of components and circuits. The preset time can be set in advance according to actual conditions, for example, 5 seconds. The reverse rotation of the fan blade means that the current rotation direction of the fan blade is opposite to the set rotation direction of the external fan during operation, indicating that the external fan is in an environment for reverse wind starting. The reverse rotation of the fan blade and the rotation speed greater than the preset rotation speed indicate that the current environment is for reverse wind starting and the wind speed is large, and at this time the external fan cannot be reliably started.

[0050] In the starting of the external fan, the rotation direction and rotation speed of the fan blade of the external fan are detected by the wind direction detection component 20 and the rotation speed detection component 30, whether the state of the reverse rotation of the fan blade and the rotation speed greater than the preset rotation speed is maintained for a preset time is judged by the state judgment circuit 40, and when it is detected that the fan blade is continuously reversed and the rotation speed is large, causing the external fan to be unable to be reliably started, the starting action of the external fan is cut off by the cooperation of the state judgment circuit 40 and the main control chip 10, and the brake component 50 is triggered to brake the fan blade in time, reducing the rotation speed of the fan blade, until the rotation speed of the fan blade is reduced to below the preset rotation speed, and the reliable starting condition is met, and then the external fan is restarted, reducing the risk of reverse wind starting of the external fan, avoiding damage to the circuit caused by overcurrent and overvoltage during reverse wind starting of the external fan, avoiding out-of-step failure of the air conditioner caused by reverse wind starting, ensuring reliable starting of the external fan, improving the reliability of reverse wind starting of the external fan of the air conditioner, and prolonging the service life of the motor.

[0051] The wind direction detection component 20 is installed to the side frame of the external fan. The wind direction detection component 20 can be a voltage type wind direction sensor, a photoelectric type wind direction sensor, or an electronic compass type wind direction sensor, etc. The wind direction detection component 20 of the embodiment can accurately and reliably detect the rotation direction of the fan blade, thereby obtaining the current wind direction. The wind direction detection component 20 is connected to the first input end of the main control chip 10, and the wind direction detection component 20 can output a high level or a low level to the main control chip 10, for example, outputting a high level when the wind direction detection component 20 detects the reverse rotation of the fan blade, and outputting a low level when the wind direction detection component 20 detects the forward rotation of the fan blade.

[0052] The rotation speed detection component 30 can be a Hall rotation speed sensor, a photoelectric type wind speed sensor, a mechanical type wind speed sensor, or an ultrasonic type wind speed sensor, etc. The rotation speed detection component 30 of the embodiment can accurately and reliably detect the rotation speed of the fan blade, thereby obtaining the current wind speed. The rotation speed detection component 30 is connected to the second input end of the main control chip 10, and the rotation speed detection component 30 can output a signal to the main control chip 10.

[0053] As Figure 2As shown, a wind direction detection component 20 is installed on the side frame of the external fan. Taking a Hall speed sensor as an example, the speed detection component 30 includes a Hall speed sensor 31 and a matching magnetic material 32. The Hall speed sensor 31 is placed on the rear side of the fan blade shaft diameter, and the magnetic material 32 (such as a small magnet) is placed on the fan blade 60. The S pole of the magnetic material 32 is aligned with the Hall speed sensor 31.

[0054] like Figure 3 and Figure 4 As shown, the braking component 50 is mounted to the hub 61 of the fan blade 60. The braking component 50 includes a first brake pad 51 and a second brake pad 52. The first end of the first brake pad 51 is mounted to the first surface of the hub 61, and the first end of the second brake pad 52 is mounted to the second surface of the hub 61, with the first and second surfaces facing each other. The second ends of the first brake pad 51 and the second ends of the second brake pad 52 are connected by a brake cable 53. Based on the above structure, effective and timely braking of the fan blade can be achieved by controlling the brake cable 53.

[0055] The state determination circuit 40 includes a comparison circuit and a delay circuit. The input of the comparison circuit is connected to the main control chip 10, serving as the input of the state determination circuit 40. The input of the delay circuit is connected to the output of the comparison circuit. The output of the delay circuit is connected to the main control chip 10 and the braking component 50, serving as the output of the state determination circuit 40. The comparison circuit receives wind direction and speed signals from the main control chip 10. When the fan blades are rotating in the opposite direction, it compares the current speed of the fan blades with a preset speed and outputs a signal corresponding to the comparison result. The delay circuit determines whether the state of reverse fan blade rotation and speed exceeding the preset speed continues for a preset time and outputs a signal corresponding to the determination result. Through the comparison circuit and the delay circuit, it is possible to quickly and reliably determine whether the external fan meets the conditions for reliable start-up.

[0056] like Figure 5 As shown, the comparison circuit includes a comparator U1. The non-inverting input of comparator U1 is connected to the first output of the main control chip 10 through a first resistor R1. The first output of the main control chip 10 is used to output a rotation speed signal. The inverting input of comparator U1 is connected to the second output of the main control chip 10 through a second resistor R2 and a first switch Q1. The second output of the main control chip 10 is used to output a wind direction signal. The first switch Q1 is turned on when the wind direction signal output by the second output of the main control chip 10 indicates that the fan blades are rotating in the opposite direction. The inverting input of comparator U1 is also grounded through a third resistor R3. The output of comparator U1 serves as the output of the comparison circuit.

[0057] The positive input end of the comparator U1 inputs a voltage signal corresponding to the current rotating speed of the fan blade, and the negative input end of the comparator U1 inputs a voltage signal corresponding to the preset rotating speed, so that the comparator U1 can compare the current rotating speed of the fan blade with the preset rotating speed.

[0058] The first pole of the first switch tube Q1 is connected to the second output end of the main control chip 10, the second pole of the first switch tube Q1 is connected to the power supply VCC, the third pole of the first switch tube Q1 is connected to the negative input end of the comparator U1 through the second resistor R2, and the third pole of the first switch tube Q1 is also grounded through the fourth resistor R4. The first switch tube is used to enable the state judgment circuit 40 to work only when the fan blade reversely rotates, so as to avoid unnecessary operation.

[0059] The delay circuit can be an integration circuit, an RC circuit or an IC 555 chip, etc. The delay circuit can be used to determine whether the state of the reversely rotating fan blade with a large rotating speed is a transient state or a continuous state. Specifically, when the preset time is reached but the set output is not reached, it is considered as a transient state, and when the preset time is reached and the set output is reached, it is considered as a continuous state. For example, as shown in FIG. 5, an integration circuit is taken as an example for description. Figure 5

[0060] The delay circuit includes an operational amplifier U2. The positive input end of the operational amplifier U2 is connected to the output end of the comparison circuit through the fifth resistor R5 and the second switch tube Q2 in sequence, and the second switch tube Q2 is turned on when the signal output by the comparison circuit indicates that the current rotating speed of the fan blade is greater than the preset rotating speed. The negative input end of the operational amplifier U2 is grounded. The output end of the operational amplifier U2 is connected to the positive input end of the operational amplifier U2 through the capacitor C1, and the output end of the operational amplifier U2 is also connected to the third input end of the main control chip 10 and the brake component 50, and the output end of the operational amplifier U2 serves as the output end of the delay circuit.

[0061] The preset time is determined by the fifth resistor R5 and the capacitor C1, and specifically, the preset time T=R5xC1.

[0062] The first pole of the second switch tube Q2 is connected to the output end of the comparison circuit, the second pole of the second switch tube Q2 is connected to the power supply VCC, the third pole of the second switch tube Q2 is connected to the positive input end of the operational amplifier U2 through the fifth resistor R5, and the third pole of the second switch tube Q2 is also grounded through the sixth resistor R6. The second switch tube is used to enable the delay circuit to determine the continuity of the state only when the fan blade reversely rotates and the rotating speed is greater than the preset rotating speed, so as to avoid unnecessary operation.

[0063] ​The output end of the state judging circuit 40 is connected to the braking component 50 through the third switch tube Q3 and the relay K1 in turn. The third switch tube Q3 is turned on when the state judging circuit 40 outputs the control signal, and the relay K1 is powered by VCC and closed. The first pole of the third switch tube Q3 is connected to the output end of the state judging circuit 40, the second pole of the third switch tube Q3 is connected to the power supply VCC, the third pole of the third switch tube Q3 is connected to the braking component 50 through the relay K1, and the third pole of the third switch tube Q3 is also grounded through the seventh resistor R7. The third switch tube allows the braking component 50 to act only when the fan blade reverses rotation and the rotating speed is greater than the preset rotating speed for a preset time, so as to avoid false action.

[0064] The switch tube mentioned in the embodiment can be a triode or a field effect tube, Figure 5 Taking the triode as an example, the first pole of the switch tube is the base, the second pole of the switch tube is the collector, and the third pole of the switch tube is the emitter. If the field effect tube is used, the first pole of the switch tube is the gate, the second pole of the switch tube is the drain, and the third pole of the switch tube is the source.

[0065] The device can further include an alarm component connected to the output end of the state judging circuit 40, used to prompt the condition that the fan blade reverses rotation and the rotating speed is greater than the preset rotating speed for a preset time under the driving of the control signal. The alarm component can be a light emitting diode, a buzzer or a display, etc. Figure 5 As shown in the figure, the alarm component is a light emitting diode D1.

[0066] Reference Figure 5 The wind direction detection component 20 detects the rotating direction of the fan blade of the external fan, and transmits the detection result to the main control chip 10. The main control chip 10 outputs the wind direction signal to the base of the triode Q1. If the wind direction signal indicates that the fan blade reverses rotation, Q1 is turned on.

[0067] The rotating speed detection component 30 detects the rotating speed of the fan blade, and transmits the detection result to the main control chip 10. The main control chip 10 outputs the rotating speed signal to the positive input end of the comparator U1. The comparison circuit is used to judge whether the current rotating speed of the fan blade is greater than the preset rotating speed. The integration circuit is used to judge whether the state that the fan blade reverses rotation and the rotating speed is large is a transient state or a continuous state. When the preset time is reached but the set output cannot be reached, it is a transient state, and the preset time T=R5xC1. When the state that the fan blade reverses rotation and the rotating speed is large lasts for more than the preset time, the alarm component and the braking component 50 are started, and the external fan is temporarily stopped. When the rotating speed of the fan blade is less than or equal to the preset rotating speed, the external fan is restarted. The state judging circuit, the braking component and the alarm component can be called a protection circuit, which includes three modes:

[0068] (1) Normal starting mode

[0069] When the wind direction detection component 20 detects that the fan blade is rotating forward or not rotating, the main control chip 10 outputs a low level, the protection circuit does not work, and at this time the external fan is normally started.

[0070] (2) Direct start mode against wind

[0071] When the wind direction detection component 20 detects that the fan blade is rotating in the opposite direction, the first switch tube Q1 base is high, Q1 is turned on, and point A is high. The rotation speed detection component 30 detects the rotation speed of the fan blade and transmits the detection result to the main control chip 10. The main control chip 10 outputs a rotation speed signal to the comparator U1 for rotation speed size judgment.

[0072] ① When the rotation speed is small:

[0073] When the rotation speed is small, that is, the rotation speed of the fan blade is less than or equal to the preset rotation speed. At this time, the voltage at the same phase input end of the comparator U1 is less than the voltage at the opposite phase input end. The comparator U1 outputs a low level "-". The second switch tube Q2 is not turned on. Point B is low. The input end of U2 is less than the opposite phase input end. The output of the integration circuit is also low. The level signal is input to the third input end of the main control chip 10. At this time, the main control chip 10 issues a command. The external fan is normally started. It is a direct start mode against wind.

[0074] ② When the rotation speed is large, but the fan blade is rotating in the opposite direction and the rotation speed is greater than the preset rotation speed for a time that cannot be sustained:

[0075] When the rotation speed is large, that is, the rotation speed of the fan blade is greater than the preset rotation speed. At this time, the voltage at the same phase input end of the comparator U1 is greater than the voltage at the opposite phase input end. The comparator U1 outputs a high level "+". The transistor Q2 is turned on. Point B is high. The input end of U2 is greater than the opposite phase input end. If the state of the fan blade rotating in the opposite direction and the rotation speed being large is a transient state at this time, the output of the integration circuit cannot reach the set value. The output of the integration circuit is low. At this time, the main control chip 10 issues a command. The external fan is normally started. It is a direct start mode against wind.

[0076] (3) Start mode against wind stop mode

[0077] When the wind direction detection component 20 detects the reverse rotation of the fan blade, the main control chip 10 outputs a high level to the base of the transistor Q1, the transistor Q1 is turned on, and the point A is high. When the rotation speed of the fan blade is large, i.e., the rotation speed is greater than the preset rotation speed, the comparator U1 outputs a high level "+", Q2 is turned on, and the point B is high. If the state of the reverse rotation of the fan blade and the large rotation speed is a continuous state, the output of the integration circuit reaches a set value, U2 outputs a high level "+", Q3 is turned on, and the point C becomes high. The high level is transmitted to the main control chip 10, the coil of the relay K1 is controlled to be powered, the contact of K1 is closed, and at this time, it is the reverse wind stop starting mode. The K1 contact is closed, the light-emitting diode D1 circuit is turned on, the light-emitting diode D1 emits light, and the user is reminded that the current reverse wind speed is too large. At the same time, the main control chip 10 sends a command to cut off the external fan starting action, the external fan is temporarily stopped, and the brake component 50 is started to stop the reverse rotation of the fan blade. At this time, the fan blade may still rotate under the action of the external natural wind, as long as the rotation speed does not exceed the preset rotation speed, the external fan can be restarted. After a period of time, if the external fan has not started, the rotation speed of the fan blade at this time is detected again. If the fan blade is still rotating in the reverse direction and the rotation speed is greater than the preset rotation speed, the brake component 50 is continuously started until the detected rotation speed of the fan blade is less than or equal to the preset rotation speed. The main control chip 10 sends a command to start the external fan normally.

[0078] The embodiment of the present application also provides an air conditioning equipment, which comprises the air conditioner external fan reverse wind starting control device.

[0079] As shown in the figure, Figure 6 The air conditioner external fan reverse wind starting process comprises the following steps:

[0080] S601, start, start the air conditioner, and the main control chip 10 sends a starting command to the external fan.

[0081] S602, the wind direction detection component 20 detects the rotation direction of the fan blade.

[0082] S603, judge whether the fan blade is reverse rotation, if yes, enter S604, if not, enter S608.

[0083] S604, the rotation speed detection component 30 detects the rotation speed of the fan blade.

[0084] S605, judge whether the current rotation speed of the fan blade is greater than the preset rotation speed, if yes, enter S606, if not, enter S608.

[0085] S606, judge whether the state of the reverse rotation of the fan blade and the rotation speed greater than the preset rotation speed is a continuous state, if yes, enter S607, if not, enter S608.

[0086] S607, suspend starting, trigger the brake component 50 and the alarm component, and return to S602 to rejudge the state of the fan blade.

[0087] S608, start the outer fan.

[0088] S609, end.

[0089] In the embodiment, when starting the outer fan, the rotation direction and the rotating speed of the fan blade of the outer fan are detected. In the case that the fan blade rotates reversely and the rotating speed is relatively high and the state lasts for a preset time, the brake is triggered in time, the current rotating state of the fan blade is changed, and the main control chip sends an instruction to cut off the starting action of the outer fan until the rotating speed of the fan blade is reduced to below the preset rotating speed for reliable starting, and then the outer fan is started again. The risk existing when the outer fan starts in the adverse wind can be reduced, and the effect of reliable starting of the outer fan is achieved.

[0090] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A reverse-wind start control device for an air conditioner outdoor fan, characterized in that, The application relates to a wind direction detection device for an external fan, which comprises a main control chip, a wind direction detection component, a rotating speed detection component, a state judgment circuit and a braking component. The wind direction detection component is connected to the main control chip and used for detecting the rotating direction of the external fan blade. The rotating speed detection component is connected to the main control chip and used for detecting the rotating speed of the external fan blade. The state judgment circuit is connected to the main control chip and used for judging whether the state of the reverse rotation of the fan blade and the rotating speed greater than the preset rotating speed is maintained for a preset time, and outputting a control signal when the judgment result is yes. The braking component is installed to the hub of the fan blade and connected to the state judgment circuit, and used for braking the fan blade under the drive of the control signal. The main control chip is used for cutting off the starting action of the external fan under the drive of the control signal, and restarting the external fan when the rotating speed of the fan blade is reduced to be less than or equal to the preset rotating speed. The state judgment circuit comprises a comparison circuit and a delay circuit; the input end of the comparison circuit is connected to the main control chip; the input end of the delay circuit is connected to the output end of the comparison circuit; and the output end of the delay circuit is connected to the main control chip and the braking component. The comparison circuit is used for receiving the wind direction signal and the rotating speed signal from the main control chip, comparing the current rotating speed of the fan blade with the preset rotating speed when the fan blade reversely rotates, and outputting a signal corresponding to the comparison result. The delay circuit is used for judging whether the state of the reverse rotation of the fan blade and the rotating speed greater than the preset rotating speed is maintained for a preset time, and outputting a signal corresponding to the judgment result. The comparison circuit comprises a comparator; the positive phase input end of the comparator is connected to the first output end of the main control chip through a first resistor, the first output end of the main control chip is used for outputting the rotating speed signal; the negative phase input end of the comparator is connected to the second output end of the main control chip through a second resistor and a first switch tube in sequence, the second output end of the main control chip is used for outputting the wind direction signal, the first switch tube is turned on when the wind direction signal outputted by the second output end of the main control chip indicates the reverse rotation of the fan blade; the negative phase input end of the comparator is also grounded through a third resistor; and the output end of the comparator is used as the output end of the comparison circuit. The delay circuit comprises an operational amplifier; the positive phase input end of the operational amplifier is connected to the output end of the comparison circuit through a fifth resistor and a second switch tube in sequence, the second switch tube is turned on when the signal outputted by the comparison circuit indicates that the current rotating speed of the fan blade is greater than the preset rotating speed; the negative phase input end of the operational amplifier is grounded; the output end of the operational amplifier is connected to the positive phase input end of the operational amplifier through a capacitor; and the output end of the operational amplifier is also connected to the main control chip and the braking component. The first pole of the first switch tube is connected to the second output end of the main control chip, the second pole of the first switch tube is connected to a power supply, the third pole of the first switch tube is connected to the negative phase input end of the comparator through the second resistor, and the third pole of the first switch tube is also grounded through a fourth resistor.

2. The reverse wind starting control device for an outdoor fan of an air conditioner according to claim 1, characterized in that, ​ 3. The reverse wind starting control device for an outdoor fan of an air conditioner according to claim 1, wherein The first pole of the second switch tube is connected to the output end of the comparison circuit, the second pole of the second switch tube is connected to a power supply, the third pole of the second switch tube is connected to the positive input end of the operational amplifier through the fifth resistance, and the third pole of the second switch tube is also grounded through a sixth resistance.

4. The reverse wind starting control device for an outdoor fan of an air conditioner according to claim 1, wherein The output end of the state judgment circuit is connected to the brake component through a third switch tube and a relay in sequence, and the third switch tube is turned on when the state judgment circuit outputs the control signal. The first pole of the third switch tube is connected to the output end of the state judgment circuit, the second pole of the third switch tube is connected to a power supply, the third pole of the third switch tube is connected to the brake component through the relay, and the third pole of the third switch tube is also grounded through a seventh resistance.

5. The reverse wind starting control device for an outdoor fan of an air conditioner according to claim 1, wherein The brake component comprises a first brake pad and a second brake pad, the first end of the first brake pad is mounted to the first surface of the hub, the first end of the second brake pad is mounted to the second surface of the hub, the first surface is opposite to the second surface, and the second end of the first brake pad and the second end of the second brake pad are connected through a brake line.

6. The reverse wind starting control device for an outdoor fan of an air conditioner according to any one of claims 1 to 5, characterized by Further comprising: An alarm component connected to the output end of the state judgment circuit, used for prompting the situation that the wind blade continuously meets the reverse rotation and the rotating speed is greater than the preset rotating speed for a preset time under the driving of the control signal.

7. The reverse wind starting control device for an outdoor fan of an air conditioner according to any one of claims 1 to 5, characterized by The wind direction detection component is mounted to the side frame of the outer fan, and the wind direction detection component is a voltage type wind direction sensor, a photoelectric type wind direction sensor or an electronic compass type wind direction sensor; and the rotating speed detection component is a Hall rotating speed sensor, a photoelectric type wind speed sensor, a mechanical type wind speed sensor or an ultrasonic type wind speed sensor.

8. An air conditioning apparatus characterized by comprising: The air conditioner outer fan adverse wind starting control device of any one of claims 1 to 7 is included. The air conditioner outer fan adverse wind starting control device of any one of claims 1 to 7 is included.

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