CN112880053B - Control method of axial flow fan, axial flow fan control device and air conditioner - Google Patents
Control method of axial flow fan, axial flow fan control device and air conditioner Download PDFInfo
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- CN112880053B CN112880053B CN202110096228.5A CN202110096228A CN112880053B CN 112880053 B CN112880053 B CN 112880053B CN 202110096228 A CN202110096228 A CN 202110096228A CN 112880053 B CN112880053 B CN 112880053B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
- F24F2110/32—Velocity of the outside air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The application provides a control method of an axial flow fan, a control device of the axial flow fan and an air conditioner. The control method of the axial flow fan comprises the following steps: acquiring the working state of the fan; when the fan is in an air volume grade ascending state, controlling the fan to be switched from a shutdown state to a strong wind interference resistant state, or controlling the fan to be switched from the strong wind interference resistant state to a large air volume tracking state; when the fan is in a state of descending air volume grade, the fan is controlled to be switched from a large air volume tracking state to a strong wind interference resistant state, or the fan is controlled to be switched from the strong wind interference resistant state to a shutdown state. According to the control method of the axial flow fan, the interference of strong wind to the fan can be reduced, and the operation stability of the fan is improved.
Description
Technical Field
The application relates to the technical field of compressors, in particular to a control method of an axial flow fan, a control device of the axial flow fan and an air conditioner.
Background
Due to the restriction of the application environment, the outdoor unit of the air conditioner is often installed in a windy position. And the direction, speed, duration, etc. of the wind are time-varying. The strong interference can affect the rotating speed stability of the fan blades and the fan blade efficiency of the outer fan, and even can cause the abnormal reversal of the fan blades of the outer fan of the air conditioner. In order to improve the anti-interference capability of the air conditioner outer fan and enhance the fan blade efficiency of the outer fan, corresponding solutions are provided by partial scholars and technicians.
The influence of centrifugal force and airflow on the stress of the fan blade is analyzed in Suyu space of the Kyoho electric appliance Limited company in air-conditioning axial flow fan blade strength analysis and optimization, the effect of the centrifugal force and the airflow on the stress of the fan blade is explained, and the method for improving the stress strength of the fan blade by adopting reinforcing ribs and thickening stress areas is provided. The method well improves the strength of the fan blades, enables the fan to operate in a high-rotation-speed state well, and finally improves the performance of the air conditioner, but does not relate to the anti-interference capability of strong wind to the fan blades and the heat dissipation capability of an outer fan.
In the ' research and application of parameterization design of axial flow fan blade of air conditioner ' by Ningbo Axok air conditioner Limited ' Linjuan, the method adopts airfoil data designed by FORTRAN program, and directly controls the sweep angle and the installation angle (namely the pitch angle) of the fan blade through CREO software to set the shape of the fan blade. The method well realizes the human interaction design level of the fan blade design, but the designed fan blade wing profile is fixed, and the dynamic adjustment in the whole machine operation process cannot be realized.
In research on an axial flow fan blade optimization design method for an air conditioner, which is filed by yellow pleasure and the like of refrigeration equipment Limited in Guangdong America, the installation angle (namely the pitch angle) of the axial flow fan blade is analyzed and optimized through fluent, and finally the fan blade efficiency is improved by 3.42 percent, namely the fan blade efficiency can be optimized by changing the pitch angle. However, the method also has the problem that the wing profiles of the fan blades are fixed, and the dynamic adjustment in the whole operation process cannot be realized.
In conclusion, the blade efficiency of the air conditioner can be effectively improved by adjusting the pitch angle, but the blade wing profile of the existing air conditioning equipment is relatively fixed, and the dynamic adjustment in the running process of the whole machine cannot be realized.
Disclosure of Invention
Therefore, an object of the present invention is to provide a method for controlling an axial flow fan, an axial flow fan control device, and an air conditioner, which can reduce interference of strong wind to the fan and improve operation stability of the fan.
In order to solve the above problem, the present application provides a control method of an axial flow fan, including:
acquiring the working state of the fan;
when the fan is in an air volume grade ascending state, controlling the fan to be switched from a shutdown state to a strong wind interference resistant state, or controlling the fan to be switched from the strong wind interference resistant state to a large air volume tracking state;
when the fan is in a state of descending air volume grade, the fan is controlled to be switched from a large air volume tracking state to a strong wind interference resistant state, or the fan is controlled to be switched from the strong wind interference resistant state to a shutdown state.
Preferably, the step of controlling the fan to switch from the shutdown state to the strong wind interference resistant state comprises:
obtaining the wind speed VWind power；
Wind speed VWind powerWith a set value V of wind speeddirComparing to obtain a comparison result;
determining the starting state of the fan according to the comparison result;
and controlling the fan to start.
Preferably, the step of determining the starting state of the fan according to the comparison result includes:
when V isWind power＜VdirWhen the air is exhausted, the fan is determined to rotate forwards;
when V isWind power≥VdirDetermining reverse air inlet of the fan;
and after the air outlet direction of the fan is determined, adjusting the pitch angle to enable the air flow attack angle to be minimum.
Preferably, VdirThe critical value of high and low wind speed.
Preferably, the step of controlling the fan to switch from the strong wind interference resistant state to the large wind tracking state comprises:
after the fan is started successfully, controlling the fan to enter a large air volume tracking state;
starting the temperature control of the outer pipe with the variable pitch, and dynamically adjusting the pitch angle according to the temperature value of the outer pipe temperature.
Preferably, the step of dynamically adjusting the pitch angle according to the temperature value of the outer tube temperature comprises:
obtaining the temperature T of the outer tubeOuter tubeAnd setting the temperature T of the outer tubePeripheral equipment；
Obtaining a temperature deviation ek＝TPeripheral equipment-TOuter tube；
Calculating pitch angle
Wherein k represents the kth sample; kpIs a proportional parameter; kiIs an integral parameter; kdIs a differential parameter; e.g. of the typekThe deviation value is the current deviation value; e.g. of the typek-1The last deviation value is obtained; a. the0The coefficient is adjusted for the static error.
Preferably, the step of controlling the fan to switch from the high wind tracking state to the strong wind interference resistant state comprises:
acquiring the rotating speed of a fan;
when the rotating speed of the fan is reduced to a set value, controlling the fan to exit from a large air volume tracking state and enter into a strong wind interference resistant state;
obtaining the wind speed VWind power，
When V isWind power＜VdirWhen the air is exhausted, the fan is determined to rotate forwards;
when V isWind power≥VdirAnd determining reverse air inlet of the fan.
Preferably, the step of controlling the fan to switch from the strong wind interference resistant state to the shutdown state comprises:
reducing the rotating speed of the fan; and simultaneously, adjusting the attack angle of the airflow to be 0, and closing the fan.
Preferably, the wind speed VWind powerIs obtained by the following steps:
turning off the fan, turning on the compressor and setting the frequency;
detecting an external ambient temperature TOuter coverTemperature T of the condenserCold；
Calculating the temperature difference DeltaT
△T＝TOuter cover-TCold
Calculating the wind speed V according to the temperature difference delta TWind power
VWind power＝k·ΔT+Vb
Wherein k is a proportionality coefficient of the measured actual wind speed and the temperature difference delta T under different wind speeds, VbThe wind speed correction coefficient is obtained.
According to another aspect of the present application, there is provided an axial flow fan control apparatus for implementing the above control method.
Preferably, the axial flow fan control device comprises a power supply system, a control system, a transmission system, a motor, axial flow fan blades, a variable pitch system and a temperature detection device, wherein the power supply system provides electric energy for the control system, the transmission system, the motor, the variable pitch system and the temperature detection device, the transmission system receives a driving signal provided by the control system to control the motor to move, the motor controls the spindle of the axial flow fan blades to move, the variable pitch system is installed on the axial flow fan blades and receives the driving signal of the control system to adjust the pitch angle of the axial flow fan blades, and the temperature detection device detects the external environment temperature and the condenser temperature.
Preferably, the variable pitch system comprises a support inner ring, a driving gear, an inner gear ring and a support outer ring, the support outer ring is fixedly connected with the axial flow fan blade, the inner side of the support outer ring is provided with the inner gear ring, the support inner ring is arranged on the inner side of the support outer ring relatively, a support is formed for the support outer ring, and the driving gear is mounted on the support inner ring and is in meshing transmission with the inner gear ring.
According to another aspect of the present application, there is provided an air conditioner including an axial flow fan control device as described above.
The control method of the axial flow fan comprises the following steps: acquiring the working state of the fan; when the fan is in an air volume grade ascending state, controlling the fan to be switched from a shutdown state to a strong wind interference resistant state, or controlling the fan to be switched from the strong wind interference resistant state to a large air volume tracking state; when the fan is in a state of descending air volume grade, the fan is controlled to be switched from a large air volume tracking state to a strong wind interference resistant state, or the fan is controlled to be switched from the strong wind interference resistant state to a shutdown state. According to the control method of the axial flow fan, the fan enters the strong wind interference resistant state when the fan is controlled no matter the fan is in the air volume grade ascending state or descending state, and then enters other states from the strong wind interference resistant state, so that the strong wind interference resistant state can be used as an intermediate transition state, the adjustment of the fan steering and the pitch angle can be realized in the strong wind resistant state, the fan can be matched with the current wind, the interference of the wind to the operation of the fan is reduced, and the operation stability of the fan is improved.
Drawings
Fig. 1 is a schematic structural diagram of an axial flow fan control device according to an embodiment of the present application;
FIG. 2 is a block diagram of a pitch system of an axial fan control device according to an embodiment of the present application;
FIG. 3 is a flow chart of an axial flow fan control method according to an embodiment of the present application;
FIG. 4 is a flow chart illustrating a calculation of a wind speed according to an embodiment of the present disclosure;
FIG. 5 is a diagram illustrating a transition process of an axial flow fan control method according to an embodiment of the present application;
FIG. 6 is a flow chart illustrating control of the outer tube temperature during pitch control of an axial flow fan according to an embodiment of the present application.
The reference numerals are represented as:
1. a power supply system; 2. a control system; 3. a transmission system; 4. a motor; 5. axial flow fan blades; 6. a variable pitch system; 7. a temperature detection device; 8. supporting the inner ring; 9. a driving gear; 10. an inner gear ring; 11. and supporting the outer ring.
Detailed Description
Referring to fig. 1 to 6 in combination, according to an embodiment of the present application, a method for controlling an axial flow fan includes: acquiring the working state of the fan; when the fan is in an air volume grade ascending state, firstly controlling the fan to be switched from a shutdown state to a strong wind interference resistant state, and then controlling the fan to be switched from the strong wind interference resistant state to a large air volume tracking state; when the fan is in a state of descending air volume grade, the fan is controlled to be switched from a large air volume tracking state to a strong wind interference resistant state, and then the fan is controlled to be switched from the strong wind interference resistant state to a shutdown state.
According to the control method of the axial flow fan, the fan enters the strong wind interference resistant state when the fan is controlled no matter the fan is in the air volume grade ascending state or descending state, and then enters other states from the strong wind interference resistant state, so that the strong wind interference resistant state can be used as an intermediate transition state, the adjustment of the fan steering and the pitch angle can be realized in the strong wind resistant state, the fan can be matched with the current wind, the interference of the wind to the operation of the fan is reduced, and the operation stability of the fan is improved.
The fan enters a strong wind interference resistant state, and after adaptability adjustment is carried out, the fan can be adjusted to a target state from the strong wind interference resistant state, so that the running state of the fan is matched with the state of environmental crosswind, the fan is prevented from reversing under the strong wind state, good running efficiency of the fan under the target state can be kept, the fan blade efficiency is improved, and the motor energy efficiency is improved.
The three working states of the fan are respectively a shutdown state, a strong wind interference resistant state and a large wind tracking state, and according to the refrigeration requirement of the system, the shutdown state grade is lowest, the strong wind interference resistant state grade is second, and the large wind tracking state grade is highest. The working state is improved from the stop state to the running state; the reduced operation state means a reduction in level from the operation state to the stop state. The adjusted object is determined according to each state, including the pitch angle and the rotation direction of the fan.
The step of controlling the fan to be switched from the shutdown state to the strong wind interference resistant state comprises the following steps: obtaining the wind speed VWind power(ii) a Wind speed VWind powerWith a set value V of wind speeddirComparing to obtain a comparison result; determining the starting state of the fan according to the comparison result; and controlling the fan to start.
Wherein the wind speed set value VdirIn relation to the fan efficiency, by applying the current wind speed VWind powerWith a set value V of wind speeddirCompared with the prior art, the method can accurately judge the steering of the fan, so that the fan can reach higher air outlet efficiency under the steering, and the problem of fan reversal cannot occur.
The step of determining the starting state of the fan according to the comparison result comprises the following steps: when V isWind power＜VdirWhen the air is exhausted, the fan is determined to rotate forwards; when V isWind power≥VdirDetermining reverse air inlet of the fan; and after the air outlet direction of the fan is determined, adjusting the pitch angle to enable the air flow attack angle to be minimum.
When the fan tries to start, the fan is started according to the wind speed VWind powerAnd determining the rotation direction of the fan. When wind speed VWind power＜VdirWhen the wind speed is low, the interference is low, so that the fan rotates forwards to discharge air under the condition of low interference, and the heat dissipation of the condenser is completed; when V isWind power≥VdirAnd when the wind speed is higher and the interference is larger, the wind is reversely rotated by the fan blades, and the natural wind is combined with the wind inlet of the fan blades to finish the heat dissipation of the condenser. The specific process can be expressed as follows:
wherein VdirThe critical value of high and low wind speed.
After the wind direction is determined, the pitch angle can be adjusted, the pitch angle airflow attack angle is minimum, the rotation direction of the fan is prevented from being opposite to the set direction, then the fan is started, the normal operation of the fan is guaranteed, the interference of strong wind to the fan is reduced, and the efficiency of the fan is improved. When wind forms an angle (namely an attack angle) with the fan blades, the fan blades can bear upward lifting force F lift, and when the lifting force F lift is larger than resistance, the fan blades can bear force to rotate. The method judges whether the airflow attack angle is minimum or not by measuring the rotating speed of the fan blade, and judges that the airflow attack angle reaches a smaller state when the rotating speed is lower than a smaller set value (for example, 30 rpm).
VdirThe critical value of high and low wind speed is related to the efficiency of the fan blade, and the critical value of high and low wind speed is determined by the actually tested wind outlet speed VoutDetermination of Vdir＝(Vout/2)。
In addition, the fan blade efficiency can be obtained through actual tests, and the calculation formula is as follows:
wherein Pst is the actual test value of the fan outlet static pressure, Q is the outlet flow of the fan, S is the outlet area (0.125 m ^2), ρ is the air density constant (1.225 kg/(m ^3) of the standard air density), W is the actual test value of the fan shaft power (100W for example), and V isoutThe outlet velocity is the actual test value (e.g., 10 m/s).
The wind outlet static pressure Pst of the fan blade is 0Pa, the shaft power W of the fan is 100W, the air density constant rho is 1.225kg/(m ^3), the area of the S air outlet is 0.125m ^2, and the air outlet speed is V after the testoutThe fan blade efficiency is calculated from the calculated value of 10m/s
It was 76.7%. At this time, the efficiency of the fan blade
A higher value, i.e. wind speed up to V at the outletoutThe fan blade efficiency can be higher when the fan blade is 10 m/s. Thus, the critical value V of high and low wind speed is determineddir＝Vout/2＝5m/s。
The step of controlling the fan to be switched from the strong wind interference resistant state to the large wind tracking state comprises the following steps: after the fan is started successfully, controlling the fan to enter a large air volume tracking state; starting the temperature control of the outer pipe with the variable pitch, and dynamically adjusting the pitch angle according to the temperature value of the outer pipe temperature. In the process, the fan can have high strong wind resistance, meanwhile, the pitch angle can be adjusted according to the temperature of the outer pipe, and the air volume pitch angle can be adjusted in real time, so that the pitch angle is in the optimal state all the time, the fan blade efficiency can be improved, and the fan energy efficiency is finally improved.
The step of dynamically adjusting the pitch angle according to the temperature value of the outer tube temperature comprises the following steps:
obtaining the temperature T of the outer tubeOuter tubeAnd setting the temperature T of the outer tubePeripheral equipment；
Obtaining a temperature deviation ek＝TPeripheral equipment-TOuter tube；
Calculating pitch angle
Wherein k represents the kth sample; kpIs a proportional parameter; kiIs an integral parameter; kdIs a differential parameter; e.g. of the typekThe deviation value is the current deviation value; e.g. of the typek-1The last deviation value is obtained; a. the0The coefficient is adjusted for the static error.
The step of controlling the fan to be switched from the large air volume tracking state to the strong wind interference resistant state comprises the following steps: acquiring the rotating speed of a fan; when the rotating speed of the fan is reduced to a set value, controlling the fan to exit from a large air volume tracking state and enter into a strong wind interference resistant state; obtaining the wind speed VWind powerWhen V isWind power＜VdirWhen the air is exhausted, the fan is determined to rotate forwards; when V isWind power≥VdirAnd determining reverse air inlet of the fan.
The change of the pitch angle directly influences the air flow attack angle, further influences the air outlet volume (namely, the fan blade efficiency) and the outer pipe temperature, thereby forming a closed loop to control the outer pipe temperature, and finally controlling the outer pipe temperature to be locally optimal so as to realize the local optimal fan blade efficiency.
The step of controlling the fan to be switched from the strong wind interference resistant state to the shutdown state comprises the following steps: reducing the rotating speed of the fan; and simultaneously, adjusting the attack angle of the airflow to be 0, wherein the pitch angle can be 0 or not, and then, turning off the fan.
During the operation control of the fan, the air quantity grade rising state and the air quantity grade falling state may be in a cross state, for example, the wind speed is large in a certain period, namely VWind power≥VdirAt another time interval the wind speed is small, i.e. VWind power＜VdirTherefore, in the process of adjusting the working state of the fan, no matter the air volume level needs to be increased or decreased, the working state of the fan needs to be adjusted to the strong wind interference resistant state at first, then the running state of the fan is adjusted according to the current wind speed, and after the running state of the fan is matched with the current wind speed, the fan is adjusted to the target state, namely the shutdown state or the large air volume tracking state, so that the fan is adjusted to the target state, namely the shutdown state or the large air volume tracking stateTherefore, no matter how the wind speed changes, the running state of the fan can be matched with the wind speed all the time, the problem of fan reversal in the adjusting process can be avoided, the problem of fan efficiency reduction in the adjusting process can be avoided, and the stable running of the fan is ensured.
In the process of reducing the air volume level of the fan, if a shutdown instruction is received, the large air volume tracking state can be directly adjusted to the shutdown state.
In one embodiment, the wind speed VWind powerIs obtained by the following steps:
turning off the fan, turning on the compressor and setting the frequency;
detecting an external ambient temperature TOuter coverTemperature T of the condenserCold；
Calculating the temperature difference DeltaT
△T＝TOuter cover-TCold
Calculating the wind speed V according to the temperature difference delta TWind power
VWind power＝k·ΔT+Vb
Wherein k is a proportionality coefficient of the measured actual wind speed and the temperature difference delta T under different wind speeds, VbThe wind speed correction coefficient is obtained.
k、VbThe parameters are related to the distribution of the temperature field on the condenser in the heat convection process, namely related to the installation position of the temperature sensing bulb of the condenser. k and VbThe specific numerical value is determined through an actual model according to experimental tests, and more specifically, k is a proportionality coefficient of the actual wind speed and the temperature difference delta T measured under different wind speeds, and V isbIs TCold＝TOuter coverThe actual wind speed at time.
According to the embodiment of the application, the axial flow fan control device is used for implementing the control method.
The axial flow fan control device comprises a power supply system 1, a control system 2, a transmission system 3, a motor 4, axial flow fan blades 5, a variable pitch system 6 and a temperature detection device 7, wherein the power supply system 1 provides electric energy for the control system 2, the transmission system 3, the motor 4, the variable pitch system 6 and the temperature detection device 7, the transmission system 3 receives a driving signal provided by the control system 2 to control the motor 4 to move, the motor 4 controls the spindle of the axial flow fan blades 5 to move, the variable pitch system 6 is installed on the axial flow fan blades 5 to receive a driving signal of the control system 2 to adjust the pitch angle of the axial flow fan blades 5, and the temperature detection device 7 detects the external environment temperature and the condenser temperature.
The variable pitch system 6 comprises a support inner ring 8, a driving gear 9, an inner gear ring 10 and a support outer ring 11, the support outer ring 11 is fixedly connected with the axial flow fan blade 5, the inner side of the support outer ring 11 is provided with the inner gear ring 10, the support inner ring 8 is arranged on the inner side of the support outer ring 11 relatively, and supports the support outer ring 11, and the driving gear 9 is installed on the support inner ring 8 and is in meshing transmission with the inner gear ring 10. Wherein the driving gear 9 is driven by a motor, preferably a stepper motor.
When the pitch angle of the axial flow fan blade is adjusted, the adjusting direction of the pitch angle can be determined, then the required adjusting angle is calculated, then the rotating direction and the rotating step number of the stepping motor are determined, the stepping motor is controlled to rotate, the stepping motor drives the driving gear 9 to rotate according to the preset direction, the driving gear 9 rotates to drive the support outer ring 11 to rotate through the inner gear ring 10, and then the axial flow fan blade installed on the support outer ring 11 is driven to rotate, so that the adjustment of the pitch angle of the axial flow fan blade is realized.
According to an embodiment of the present application, an air conditioner includes an axial flow fan control device, which is the above-described axial flow fan control device.
The wind speed detection function can be realized according to the outer ring temperature sensor and the condenser sensor; by adjusting the pitch angle, the interference of strong wind to the fan can be reduced; the fan blade efficiency can be improved by searching for the optimal air volume pitch angle, and the energy efficiency is finally improved; the variable-pitch function of the outer fan blades can be realized by modifying the fan blade structure and installing the variable-pitch driving gear.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (13)
1. The control method of the axial flow fan is characterized in that the axial flow fan is positioned at an air conditioner external unit and used for radiating heat of a condenser, and comprises the following steps:
acquiring the working state of a fan, wherein the working state of the fan comprises a shutdown state, a strong wind interference resistance state and a large wind volume tracking state, the shutdown state grade is lowest, the strong wind interference resistance state grade is second, and the large wind volume tracking state grade is highest according to the refrigeration requirement of a system; the strong wind resistant state realizes the adjustment of the steering and the pitch angle of the fan; the large air volume tracking state starts the temperature control of the variable-pitch outer pipe, and the pitch angle is dynamically adjusted according to the temperature value of the outer pipe temperature;
when the fan is in an air volume grade ascending state, controlling the fan to be switched from a shutdown state to a strong wind interference resistant state, or controlling the fan to be switched from the strong wind interference resistant state to a large air volume tracking state;
when the fan is in a state of descending air volume grade, the fan is controlled to be switched from a large air volume tracking state to a strong wind interference resistant state, or the fan is controlled to be switched from the strong wind interference resistant state to a shutdown state.
2. The control method according to claim 1, wherein the step of controlling the fan to switch from the shutdown state to the anti-strong wind interference state comprises:
obtaining the wind speed VWind power；
Wind speed VWind powerWith a set value V of wind speeddirComparing to obtain a comparison result;
determining the starting state of the fan according to the comparison result;
and controlling the fan to start.
3. The control method according to claim 2, wherein the step of determining the start-up state of the fan according to the comparison result includes:
when V isWind power＜VdirWhen the air is exhausted, the fan is determined to rotate forwards;
when V isWind power≥VdirDetermining reverse air inlet of the fan;
and after the air outlet direction of the fan is determined, adjusting the pitch angle to enable the air flow attack angle to be minimum.
4. Control method according to claim 2, characterized in that VdirThe critical value of high and low wind speed.
5. The control method according to claim 2, wherein the step of controlling the fan to switch from the strong wind interference resistant state to the large wind tracking state comprises:
after the fan is started successfully, controlling the fan to enter a large air volume tracking state;
starting the temperature control of the outer pipe with the variable pitch, and dynamically adjusting the pitch angle according to the temperature value of the outer pipe temperature.
6. The control method according to claim 5, wherein the step of dynamically adjusting the pitch angle in dependence on the temperature value of the outer tube temperature comprises:
obtaining the temperature T of the outer tubeOuter tubeAnd setting the temperature T of the outer tubePeripheral equipment；
Obtaining a temperature deviation ek＝TPeripheral equipment-TOuter tube；
Calculating pitch angle
Wherein k represents the kth sample; kpIs a proportional parameter; kiIs an integral parameter; kdIs a differential parameter; e.g. of the typekThe deviation value is the current deviation value; e.g. of the typek-1The last deviation value is obtained; a. the0The coefficient is adjusted for the static error.
7. The control method according to claim 1, wherein the step of controlling the fan to switch from the high wind tracking state to the strong wind interference resistant state comprises:
acquiring the rotating speed of a fan;
when the rotating speed of the fan is reduced to a set value, controlling the fan to exit from a large air volume tracking state and enter into a strong wind interference resistant state;
obtaining the wind speed VWind power，
When V isWind power＜VdirWhen the air is exhausted, the fan is determined to rotate forwards;
when V isWind power≥VdirAnd determining reverse air inlet of the fan.
8. The control method of claim 7, wherein the step of controlling the fan to switch from the anti-windage condition to the shutdown condition comprises:
reducing the rotating speed of the fan; and simultaneously, adjusting the attack angle of the airflow to be 0, and closing the fan.
9. Control method according to claim 2 or 7, characterized in that the wind speed VWind powerIs obtained by the following steps:
turning off the fan, turning on the compressor and setting the frequency;
detecting an external ambient temperature TOuter coverTemperature T of the condenserCold；
Calculating the temperature difference DeltaT
△T＝TOuter cover-TCold
Calculating the wind speed V according to the temperature difference delta TWind power
VWind power＝k·ΔT+Vb
Wherein k is a proportionality coefficient of the measured actual wind speed and the temperature difference delta T under different wind speeds, VbThe wind speed correction coefficient is obtained.
10. An axial flow fan control device for carrying out the control method according to any one of claims 1 to 9.
11. The axial flow fan control device according to claim 10, wherein the axial flow fan control device comprises a power supply system (1), a control system (2), a transmission system (3), a motor (4), axial flow fan blades (5), a pitch system (6) and a temperature detection device (7), the power supply system (1) provides electric energy for the control system (2), the transmission system (3), the motor (4), the pitch system (6) and the temperature detection device (7), the transmission system (3) receives a driving signal provided by the control system (2) to control the motor (4) to move, the motor (4) controls the spindle movement of the axial flow fan blades (5), the pitch system (6) is installed on the axial flow fan blades (5) to receive a driving signal of the control system (2) to adjust the pitch angle of the axial flow fan blades (5), the temperature detection device (7) detects an external environment temperature and a condenser temperature.
12. The axial flow fan control device according to claim 11, wherein the pitch control system (6) comprises a support inner ring (8), a driving gear (9), an inner gear ring (10) and a support outer ring (11), the support outer ring (11) is fixedly connected with the axial flow fan blade (5), the inner gear ring (10) is arranged on the inner side of the support outer ring (11), the support inner ring (8) is arranged on the inner side of the support outer ring (11) relative to the support outer ring (11) to support the support outer ring (11), and the driving gear (9) is mounted on the support inner ring (8) and is in meshing transmission with the inner gear ring (10).
13. An air conditioner comprising an axial flow fan control device, characterized in that the axial flow fan control device is the axial flow fan control device according to any one of claims 10 to 12.
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| CN202110096228.5A CN112880053B (en) | 2021-01-25 | 2021-01-25 | Control method of axial flow fan, axial flow fan control device and air conditioner |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6358052A (en) * | 1986-08-27 | 1988-03-12 | Matsushita Seiko Co Ltd | Outdoor unit of separate type air conditioner |
| JPH07174361A (en) * | 1993-12-17 | 1995-07-14 | Mitsubishi Heavy Ind Ltd | Outdoor unit for air-conditioning machine |
| CN102997373B (en) * | 2012-12-28 | 2014-11-05 | 海信（山东）空调有限公司 | Method for controlling outdoor fan of air conditioner according to environmental wind direction |
| CN104676777B (en) * | 2013-11-26 | 2018-03-27 | 广东美的制冷设备有限公司 | Air-conditioner outdoor unit |
| CN109114750A (en) * | 2018-07-10 | 2019-01-01 | 青岛海尔空调器有限总公司 | Control method, device and the computer readable storage medium of air-conditioner outdoor unit |
| CN109282432A (en) * | 2018-09-19 | 2019-01-29 | 珠海格力电器股份有限公司 | A kind of blower starts control method, device and air-conditioner set with the wind |
| CN209654303U (en) * | 2019-03-15 | 2019-11-19 | 奥克斯空调股份有限公司 | A kind of adjustable shutter axial wheel component |
| CN112229038B (en) * | 2019-07-15 | 2021-10-29 | 青岛海尔空调器有限总公司 | Control method for air conditioner and air conditioner |
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