CN110726202A - External fan control method of air conditioner and air conditioner - Google Patents

External fan control method of air conditioner and air conditioner Download PDF

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Publication number
CN110726202A
CN110726202A CN201911027451.3A CN201911027451A CN110726202A CN 110726202 A CN110726202 A CN 110726202A CN 201911027451 A CN201911027451 A CN 201911027451A CN 110726202 A CN110726202 A CN 110726202A
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China
Prior art keywords
temperature
fan
external
air conditioner
external fan
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CN201911027451.3A
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Chinese (zh)
Inventor
应必业
陈伟
古汤汤
冷泠
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Priority to CN201911027451.3A priority Critical patent/CN110726202A/en
Publication of CN110726202A publication Critical patent/CN110726202A/en
Pending legal-status Critical Current

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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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F24F11/77—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 by controlling the speed of ventilators
    • 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
    • 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
    • F24F2110/10—Temperature
    • 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
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Fluid Mechanics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides an external fan control method of an air conditioner, which comprises the following steps: s100, entering a low-temperature refrigeration mode; s101, judging the current state of the outer fan, and if the outer fan is in the running state, turning to the step S102; otherwise, go to step S103; s102, acquiring the temperature of an outer coil of the air conditioner, comparing the temperature of the outer coil with a first preset temperature, and controlling the rotating speed of an outer fan according to a comparison result; s103, acquiring the temperature of the outer coil of the air conditioner and the duration of the shutdown of the outer fan, comparing the temperature of the outer coil with a second preset temperature and/or the duration of the shutdown of the outer fan with the preset maximum shutdown duration of the outer fan, and controlling the starting, stopping and rotating speed of the outer fan according to the comparison result. The state of the outer fan and the temperature of the outer coil pipe are monitored through the existing sensor of the air conditioner, so that the refrigeration operation under the outdoor low-temperature environment is controlled, the obtained refrigeration effect is good, the reliability is high, and meanwhile, the manufacturing cost is saved.

Description

External fan control method of air conditioner and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an external fan control method of an air conditioner and the air conditioner.
Background
The conventional heat pump air conditioner can realize the functions of cooling in summer and heating in winter, but in some low-temperature scenes, the air conditioner can be required to realize the cooling function. For example, in hot pot restaurants, base stations and the like, because the indoor heat source has larger heat productivity and higher indoor temperature, the air conditioner is required to refrigerate and cool.
However, the outdoor temperature in a low-temperature scene is low, so that the condensing pressure is too low during the refrigeration operation, the pressure difference at two ends of the capillary tube is too small, the flow of the refrigerant is seriously insufficient, and the refrigeration effect of the air conditioner is poor. And because the condensation pressure is low, the evaporation pressure is reduced, even lower than 0 ℃, the indoor evaporator is frozen, the thickness of the ice layer is thick to a certain degree, and the fan blades can be broken to influence the normal use of the air conditioner.
The existing partial low-temperature refrigeration air conditioner can normally refrigerate when ensuring outdoor low temperature, a pressure sensor or a temperature sensor in the middle of an outdoor condenser is generally added, so that cold energy pressure is obtained, the condensing pressure is in a proper level by controlling the rotating speed of an outer fan, the reliability of low-temperature refrigeration is ensured, and the cost of the air conditioner is increased due to the mode.
Disclosure of Invention
The invention aims to provide an external fan control method which can control the rotating speed of an external fan to achieve the effect of low-temperature refrigeration through the existing sensor of an air conditioner.
In order to solve the above problems, the present invention provides an external blower control method for an air conditioner, comprising:
s100, entering a low-temperature refrigeration mode;
s101, judging the current state of the outer fan, and if the outer fan is in the running state, turning to the step S102; if the external fan is in a stop state, the step S103 is carried out;
s102, obtaining the temperature T of the external coil of the air conditionerTemperature of outer plateComparing the temperature T of the external coilTemperature of outer plateAnd a first predetermined temperature TTarget outer disc temperatureAnd controlling the rotating speed of the outer fan according to the comparison result;
s103, acquiring the temperature T of the external coil of the air conditionerTemperature of outer plateAnd the duration t of the shutdown duration of the external fanDuration of stopComparing the temperature T of the external coilTemperature of outer plateAnd a second predetermined temperature TExit temperature of outer discAnd/or duration t of external fan outageDuration of stopThe maximum time t of the shutdown of the external fan is presetMaximum timeAnd controlling the starting, stopping and rotating speed of the outer fan according to the comparison result.
The state of the outer fan and the temperature of the outer coil pipe are monitored through the existing outer fan rotating speed sensor and the outer coil pipe temperature sensor of the air conditioner, so that the refrigeration operation under the outdoor low-temperature environment is controlled, the obtained refrigeration effect is good, the reliability is high, and meanwhile, the manufacturing cost of the air conditioner cannot be increased.
Further, the step S102 includes:
s1021, monitoring the temperature T of the outer coil pipe of the air conditioner when the outer fan runsTemperature of outer plate；
S1022, comparing the temperature T of the external coil pipe at regular intervalsTemperature of outer plateAnd a first predetermined temperature TTarget outer disc temperatureThe size of (2):
if TTemperature of outer plateHigher than TTarget outer disc temperatureIf the difference is greater than the first temperature difference threshold value T1, the rotating speed of the outer fan is increased to a gear and is increased to the maximum wind speed gear within the gear range of the outer fan at most;
if TTemperature of outer plateBelow TTarget outer disc temperatureAnd if the difference is greater than a second temperature difference threshold value T2, the rotating speed of the outer fan is reduced by b, and the rotating speed is increased to the lowest wind speed within the range of the gear of the outer fan;
if TTemperature of outer plateHigher than TTarget outer disc temperatureIs less than or equal to a first temperature difference threshold T1, or TTemperature of outer plateBelow TTarget outer disc temperatureIs less than or equal to the second temperature difference threshold T2, the outer fan speed remains unchanged.
Under the running state of the external fan, the temperature T of the external plate can be monitored through the temperature sensor of the coil pipe of the outdoor unit of the air conditionerTemperature of outer plateAnd the rotating speed of the outer fan of the air conditioner is controlled by monitoring the comparison result of the temperature of the outer disc and the preset value, so that the control of the outer fan under the low-temperature refrigeration scene is conveniently and economically realized.
Further, the value range of the first temperature difference threshold T1 is 1-2 ℃; the value range of the second temperature difference threshold T2 is 1-2 ℃.
Further, a is 1, and b is 1.
The rotating speed of the outer fan can be gradually and accurately adjusted by lifting 1 gear of the rotating speed of the outer fan every time.
Further, the first preset temperature TTarget outer disc temperatureAnd the gear range of the external fan is preset in a segmented mode according to the outdoor environment temperature and the change trend of the outdoor environment temperature.
According to different outdoor environment temperatures, the first preset temperature T is setTarget outer disc temperatureAnd the gear range of the external fan is set, so that the refrigeration effect in a low-temperature refrigeration mode can be ensured, and accurate control is realized.
Further, the first preset temperature TTarget outer disc temperatureAnd determining the corresponding relation between the gear range of the external fan and the outdoor environment temperature according to a test.
Determining the first preset temperature T through experimentsTarget outer disc temperatureThe corresponding relation between the gear range of the external fan and the outdoor environment temperature can ensure that the selection of the set value is fit with the actual situation and the accuracy of control is improvedAnd (5) determining.
Further, the step S103 includes:
s1031, when the external fan stops, monitoring the temperature T of the external coil pipe of the air conditionerTemperature of outer plateAnd the time length t of the shutdown of the external fanDuration of stop；
S1032, comparing the temperature T of the external coil in real timeTemperature of outer plateAnd a second predetermined temperature TExit temperature of outer discAnd/or the duration t of the external fan shutdownDuration of stopThe maximum time t of the shutdown of the external fan is presetMaximum timeSize of (c), if TTemperature of outer plate＞TExit temperature of outer discOr t isDuration of stop＞tMaximum timeAnd the outer fan exits the shutdown state and resumes running.
In the shutdown state of the external fan, the temperature T of the external coil is monitored by the temperature sensor of the coil of the existing outdoor unit of the air conditionerTemperature of outer plateBesides, the duration of the shutdown of the external fan is monitored, so that the pressure of the system is prevented from exceeding the standard, and the air conditioner is guaranteed to be operated reliably in a low-temperature scene.
Furthermore, after the outer fan exits the shutdown state, the outer fan operates according to the lowest wind speed.
Further, the second preset temperature TExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeAnd presetting according to indoor and outdoor ambient temperatures in a segmented manner.
Setting the second preset temperature T according to different outdoor environment temperaturesExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeThe low-temperature refrigeration effect can be ensured by setting, and accurate control is realized.
Further, the second preset temperature TExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeThe corresponding relation with the indoor and outdoor ambient temperature is determined according to the experiment.
Determining the second preset temperature T through experimentsExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeIndoor and outdoorThe corresponding relation of the environmental temperature can make the selection of the set value fit the actual situation, and the accuracy of the control is improved.
According to another aspect of the present invention, there is provided an air conditioner including:
a readable storage medium to store executable instructions;
one or more processors executing the external fan control method of the air conditioner according to the executable instructions.
The air conditioner and the external fan control method of the air conditioner have the same beneficial effects, and are not repeated herein.
Drawings
Fig. 1 is a flowchart illustrating an external blower control method of an air conditioner according to a first embodiment of the present invention;
FIG. 2 is a flowchart illustrating an external blower control method for an air conditioner according to a second embodiment of the present invention;
fig. 3 is a schematic sectional view of the outdoor environment temperature when the first preset temperature is determined by the experiment according to the embodiment of the present invention.
Detailed Description
The invention provides an air conditioner and an external fan control method thereof, which monitor the state of an external fan and the temperature of an external coil through the conventional external fan rotating speed sensor and the conventional external coil temperature sensor of the air conditioner, realize the refrigeration operation in an outdoor low-temperature environment, have good refrigeration effect and high reliability, and simultaneously can not increase the manufacturing cost of the air conditioner.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In a first exemplary embodiment of the present invention, an external blower control method of an air conditioner is provided. Fig. 1 is a flowchart illustrating an external blower control method of an air conditioner according to a first embodiment of the present invention. As shown in fig. 1, the method includes:
s100, entering a low-temperature refrigeration mode;
s101, judging the current state of the outer fan, and if the outer fan is in the running state, turning to the step S102; if the external fan is in a stop state, the step S103 is carried out;
s102, obtaining the temperature T of the external coil of the air conditionerTemperature of outer plateAnd comparing the temperature T of the external coilTemperature of outer plateAnd a first predetermined temperature TTarget outer disc temperatureAnd controlling the rotating speed of the outer fan according to the comparison result;
s103, acquiring the temperature T of the external coil of the air conditionerTemperature of outer plateAnd the duration t of the shutdown duration of the external fanDuration of stopComparing the temperature T of the external coilTemperature of outer plateAnd a second predetermined temperature TExit temperature of outer discAnd the duration t of the shutdown of the outer fanDuration of stopThe maximum time t of the shutdown of the external fan is presetMaximum timeAnd controlling the running state and the rotating speed of the outer fan according to the comparison result.
Specifically, in the external blower control method of the air conditioner according to this embodiment, the step S102 further includes:
s1021, monitoring the temperature T of the outer coil pipe of the air conditioner when the outer fan runsTemperature of outer plate；
S1022, comparing the temperature T of the external coil pipe at regular intervalsTemperature of outer plateAnd a first predetermined temperature TTarget outer disc temperatureThe size of (2):
if TTemperature of outer plateWell above TTarget outer disc temperatureI.e. TTemperature of outer plateHigher than TTarget outer disc temperatureIf the difference is greater than a first temperature difference threshold value T1, the rotating speed of the outer fan is increased to a gear and is increased to the maximum wind speed gear in the gear range;
if TTemperature of outer plateWell above TTarget outer disc temperatureI.e. TTemperature of outer plateBelow TTarget outer disc temperatureIf the difference value is greater than a second temperature difference threshold value T2, the rotating speed of the outer fan is reduced by b gear, and the rotating speed is raised to the lowest wind speed gear in the gear range;
if TTemperature of outer plateApproach to TTarget outer disc temperatureI.e. TTemperature of outer plateHigher than TTarget outer disc temperatureIs less than or equal to a first temperature difference threshold T1, or TTemperature of outer plateBelow TTarget outer disc temperatureIs less than or equal to a second temperature difference thresholdT2, the outer fan speed remains unchanged.
Wherein, T isTarget outer disc temperatureIs a program preset value. Illustratively, the speed of the outer fan can be adjusted gradually and accurately by lifting the speed gear of the outer fan by 1 gear each time when the speed gear of the outer fan is lifted.
Under the running state of the external fan, the temperature T of the external plate can be monitored through the temperature sensor of the coil pipe of the outdoor unit of the air conditionerTemperature of outer plateAnd the rotating speed of the outer fan of the air conditioner is controlled by monitoring the comparison result of the temperature of the outer disc and the preset value, so that the control of the outer fan under the low-temperature refrigeration scene is conveniently and economically realized.
The step S103 further includes:
s1031, when the external fan stops, monitoring the temperature T of the external coil pipe of the air conditionerTemperature of outer plateAnd the time length of the shutdown of the external fan;
s1032, comparing the temperature T of the external coil in real timeTemperature of outer plateAnd a second predetermined temperature TExit temperature of outer discAnd/or the duration t of the external fan shutdownDuration of stopThe maximum time t of the shutdown of the external fan is presetMaximum timeSize of (2), once TTemperature of outer plate＞TExit temperature of outer discOr t isDuration of stop＞tMaximum timeAnd the outer fan exits the shutdown state, the rotating speed of the outer fan is increased by 1 gear, and the outer fan runs at the lowest gear wind speed.
Wherein, T isExit temperature of outer discAnd tMaximum timeIs a program preset value.
In the shutdown state of the external fan, the temperature T of the external coil is monitored by the temperature sensor of the coil of the existing outdoor unit of the air conditionerTemperature of outer plateBesides, the duration of the shutdown of the external fan is monitored, so that the pressure of the system is prevented from exceeding the standard, and the air conditioner is guaranteed to be operated reliably in a low-temperature scene.
The control method of the embodiment realizes the refrigeration operation in the outdoor low-temperature environment by monitoring the temperature of the outer disc of the air conditioner and the rotating speed of the outer fan, has good refrigeration effect and high reliability, and does not increase the manufacturing cost of the air conditioner.
In a second exemplary embodiment of the present invention, a method of controlling an external blower of an air conditioner is provided. Fig. 2 is a flowchart illustrating an external blower control method of an air conditioner according to a second embodiment of the present invention. As shown in fig. 2, the method includes:
s201, in a low-temperature refrigeration running mode, starting a compressor;
s202, detecting the rotating speed of the outer fan and the temperature T of the outer coil pipe in real timeTemperature of outer plateJudging the current state of the outer fan according to the detected rotating speed of the outer fan, and if the rotating speed of the outer fan is zero, turning to the step S207; otherwise, go to step S203;
s203, comparing the current operation duration t of the external fanDuration of operationAnd a predetermined period value tPeriod of rotation speed adjustmentIf t isDuration of operation＞tPeriod of rotation speed adjustmentIf not, go to step S206;
s204, comparing the temperature T of the outer coilTemperature of outer plateAnd a first predetermined temperature TTarget outer disc temperatureThe size of (2):
if TTemperature of outer plate-TTarget outer disc temperatureIf the temperature difference is greater than the first temperature difference threshold value T1, the rotating speed of the outer fan is increased by 1 gear, and the step S205 is carried out;
if TTarget outer disc temperature-TTemperature of outer plateIf the temperature difference is greater than the second temperature difference threshold value T2, the rotating speed of the outer fan is reduced by 1 gear, and the step S205 is carried out;
if-T2 is not more than TTemperature of outer plate-TTarget outer disc temperatureT1 is not more than, the rotating speed of the outer fan is kept unchanged, and the step S205 is carried out;
illustratively, the first temperature difference threshold T1 has a value ranging from 1 ℃ to 2 ℃; the value range of the second temperature difference threshold T2 is 1-2 ℃;
the control method of the embodiment controls the rotating speed of the outer fan through the temperature of the outer coil pipe to realize low-temperature refrigeration, so that a sensor does not need to be additionally arranged.
S205, the duration t of the operation of the outer fanDuration of operationClearing, and turning to the step S202;
s206, keeping the rotating speed of the outer fan unchanged, and returning to the step S203;
s207, comparing the shutdown time t of the external fanDuration of stopThe maximum time t of the shutdown of the external fan is presetMaximum timeIf t isDuration of stop＞tMaximum timeIf yes, the outer fan exits the shutdown state, the rotating speed of the outer fan is increased by 1 gear, the outer fan runs at the wind speed of 1 gear, and the step S202 is carried out; otherwise, go to step S208;
s208, comparing the temperature T of the outer coilTemperature of outer plateAnd a second predetermined temperature TExit temperature of outer discSize of (c), if TTemperature of outer plate＞TExit temperature of outer discIf yes, the outer fan exits the shutdown state, the rotating speed of the outer fan is increased by 1 gear, the outer fan runs at the wind speed of 1 gear, and the step S202 is carried out; otherwise, go to step S207.
Illustratively, the preset temperature TExit temperature of outer discThe value range of (a) is 20-30 ℃, and the preset maximum shutdown time t of the external fan isMaximum timeThe value range of (A) is 2min-5 min.
Because the temperature acquisition of the temperature sensor has hysteresis, the falling of a temperature sensing bulb can be avoided, the sampling distortion can be caused, and the system pressure can exceed the standard if the fan is determined to be started or stopped according to the temperature value, so the requirement of the maximum time for stopping the fan is increased, and the use reliability of the air conditioner is ensured.
Further, before the step S201, the method further includes:
s200, determining a first preset temperature T through an experimentTarget outer disc temperatureA second predetermined temperature TExit temperature of outer discAnd a preset time period tMaximum time。
Wherein the first preset temperature TTarget outer disc temperatureAnd the gear range of the outer fan is accurately controlled in a segmented mode according to the outdoor environment temperature. In particular, the first preset temperature T may be determined experimentallyTarget outer disc temperatureAnd the corresponding relation between the gear range of the external fan and the outdoor environment temperature can make the selection of the set value fit the actual situation and improve the accuracy of control. Different outdoor ambient temperatures TOuter ringThe rotation speed of the outer fan and the first preset temperature T under the conditionTarget outer disc temperatureSee table 1.
TABLE 1 rotating speed and first preset temperature of the outer fan at different outdoor ambient temperatures
TOuter ring(℃) Initial gear of outer fan Range of outer fan gears TTarget outer disc temperature(℃)
A 2 4-1 25
B 1 4-0 22
C 1 3-0 20
D 1 3-0 20
E 1 2-0 20
F 1 2-0 20
As shown in Table 1, the outdoor environment temperature is divided into A to F gears, and each gear corresponds to different external fan rotating speeds and a first preset temperature TTarget outer disc temperature. Illustratively, if the air conditioner is set to employ a low temperature cooling mode below 15 ℃, then (∞, 15 deg.C)]Is divided into a to F gears.
The first preset temperature T target outer disc temperature and the outer fan gear range are set according to different outdoor environment temperatures, so that the refrigeration effect in a low-temperature refrigeration mode can be guaranteed, and accurate control is realized.
Specifically, fig. 3 is a schematic sectional view of the outdoor environment temperature when the first preset temperature is determined through the experiment according to the embodiment of the present invention. As shown in fig. 3, when the trend of change of the outdoor ambient temperature is different, the gear determination of the outdoor ambient temperature is also different. When the outdoor environment temperature is in the rising trend, the A gear corresponds to (T) corresponding to the rising edge area at the right side in the figure0-5，T0]Temperature range, B-range corresponds (T)0-10，T0-5]A temperature interval; c gear corresponding (T)0-15，T0-10]A temperature interval; d gear corresponding (T)0-20，T0-15]A temperature interval; e gear corresponding (T)0-25，T0-20]A temperature interval; f gear corresponds to (- ∞, T)0-25]A temperature interval; when the outdoor environment temperature is in a descending trend, the left falling edge area in the corresponding graph corresponds to the A gear (T)0-7，T0-2]A temperature interval; b gear corresponding (T)0-12，T0-7]A temperature interval; c gear corresponding (T)0-17，T0-12]A temperature interval; d gear corresponding (T)0-22，T0-17]A temperature interval; e gear corresponding (T)0-27，T0-22]A temperature interval; f gear corresponds to (- ∞, T)0-27]Temperature interval. When testedIn the process, the value is taken according to the rising edge on the right side by starting for the first time. Illustratively, the T is0Taking the mixture at 10-17 ℃.
The second preset temperature TExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeAnd the system pressure is not more than 4.0MPa in the running process of the air conditioner, the indoor unit does not accumulate frost, and the temperature rise of components of the controller is not more than the standard according to the indoor and outdoor environment temperature by means of segmented accurate control. In this embodiment, the second predetermined temperature TExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeThe values of (A) are shown in Table 2.
TABLE 2 values of the second preset temperature and the preset maximum shutdown time of the external fan at different temperatures
According to the test result, the first preset temperature T in the control method can be combined with the actual use environment conditionTarget outer disc temperatureRange of external fan gear and second preset temperature TExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeAnd presetting is carried out, so that the accurate control of low-temperature refrigeration is realized, and the exceeding of the system pressure is avoided.
In another embodiment of the present invention, there is provided an air conditioner including: a readable storage medium and one or more processors, wherein the readable storage medium is configured to store executable instructions; one or more processors executing the external fan control method of the air conditioner according to the executable instructions.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (11)

1. An external fan control method of an air conditioner is characterized by comprising the following steps:
s100, entering a low-temperature refrigeration mode;
s101, judging the current state of the outer fan, and if the outer fan is in the running state, turning to the step
S102; if the external fan is in a stop state, the step S103 is carried out;
s102, obtaining the temperature T of the external coil of the air conditionerTemperature of outer plateComparing the temperature T of the external coilTemperature of outer plateAnd a first predetermined temperature TTarget outer disc temperatureAnd controlling the rotating speed of the outer fan according to the comparison result;
s103, acquiring the temperature T of the external coil of the air conditionerTemperature of outer plateAnd the duration t of the shutdown duration of the external fanDuration of stopComparing the temperature T of the external coilTemperature of outer plateAnd a second predetermined temperature TExit temperature of outer discAnd/or duration t of external fan outageDuration of stopThe maximum time t of the shutdown of the external fan is presetMaximum timeAnd controlling the starting, stopping and rotating speed of the outer fan according to the comparison result.
2. The external fan control method according to claim 1, wherein the step S102 includes:
s1021, monitoring the temperature T of the outer coil pipe of the air conditioner when the outer fan runsTemperature of outer plate；
S1022, comparing the temperature T of the external coil pipe at regular intervalsTemperature of outer plateAnd a first predetermined temperature TTarget outer disc temperatureThe size of (2):
if TTemperature of outer plateHigher than TTarget outer disc temperatureIf the difference is greater than the first temperature difference threshold value T1, the rotating speed of the outer fan is increased to a gear and is increased to the maximum wind speed gear within the gear range of the outer fan at most;
if TTemperature of outer plateBelow TTarget outer disc temperatureAnd if the difference is greater than a second temperature difference threshold value T2, the rotating speed of the outer fan is reduced by b, and the rotating speed is increased to the lowest wind speed within the range of the gear of the outer fan;
if TTemperature of outer plateHigher than TTarget outer disc temperatureIs less than or equal to the firstTemperature difference threshold T1, or TTemperature of outer plateBelow TTarget outer disc temperatureIs less than or equal to the second temperature difference threshold T2, the outer fan speed remains unchanged.
3. The external fan control method according to claim 2, wherein the first temperature difference threshold T1 is in a range of 1 ℃ to 2 ℃; the value range of the second temperature difference threshold T2 is 1-2 ℃.
4. The external fan control method according to claim 2, wherein a-1 and b-1.
5. The external fan control method according to claim 2, wherein the first preset temperature TTarget outer disc temperatureAnd the gear range of the external fan is preset in a segmented mode according to the outdoor environment temperature and the change trend of the outdoor environment temperature.
6. The external fan control method according to claim 5, wherein the first preset temperature TTarget outer disc temperatureAnd determining the corresponding relation between the gear range of the external fan and the outdoor environment temperature according to a test.
7. The external fan control method according to claim 1, wherein the step S103 includes:
s1031, when the external fan stops, monitoring the temperature T of the external coil pipe of the air conditionerTemperature of outer plateAnd the time length t of the shutdown of the external fanDuration of stop；
S1032, comparing the temperature T of the external coil in real timeTemperature of outer plateAnd a second predetermined temperature TExit temperature of outer discAnd/or the duration t of the external fan shutdownDuration of stopThe maximum time t of the shutdown of the external fan is presetMaximum timeSize of (c), if TTemperature of outer plate＞TExit temperature of outer discOr t isDuration of stop＞tMaximum timeAnd the outer fan exits the shutdown state and resumes running.
8. The external fan control method according to claim 7, wherein the external fan is operated at the lowest wind speed after exiting the shutdown state.
9. The external fan control method according to claim 7, wherein the second preset temperature TExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeAnd presetting according to indoor and outdoor ambient temperatures in a segmented manner.
10. The external fan control method according to claim 7, wherein the second preset temperature TExit temperature of outer discAnd the preset maximum shutdown time t of the external fanMaximum timeThe corresponding relation with the indoor and outdoor ambient temperature is determined according to the experiment.
11. An air conditioner, comprising:
a readable storage medium to store executable instructions;
one or more processors to perform the external fan control method of the air conditioner as claimed in claims 1-10 according to the executable instructions.
CN201911027451.3A 2019-10-25 2019-10-25 External fan control method of air conditioner and air conditioner Pending CN110726202A (en)

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CN113883652A (en) * 2021-10-27 2022-01-04 南京天加环境科技有限公司 Control method for outdoor fan of variable frequency air conditioner

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