CN114427739A - Air conditioner control method and device under low-temperature refrigeration and fixed-frequency air conditioner - Google Patents

Air conditioner control method and device under low-temperature refrigeration and fixed-frequency air conditioner Download PDF

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Publication number
CN114427739A
CN114427739A CN202210017609.4A CN202210017609A CN114427739A CN 114427739 A CN114427739 A CN 114427739A CN 202210017609 A CN202210017609 A CN 202210017609A CN 114427739 A CN114427739 A CN 114427739A
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temperature
air conditioner
controlling
windshield
fan
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Inventor
胡林锋
徐啟华
张中强
丁延召
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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Priority to CN202210017609.4A priority Critical patent/CN114427739A/en
Publication of CN114427739A publication Critical patent/CN114427739A/en
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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
    • F24F11/41—Defrosting; Preventing freezing
    • F24F11/43—Defrosting; Preventing freezing of indoor units
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
    • F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
    • 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
    • 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)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Human Computer Interaction (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner control method and device under low-temperature refrigeration and a fixed-frequency air conditioner, and relates to the technical field of air conditioners, wherein the air conditioner control method under the low-temperature refrigeration comprises the following steps: when the fixed-frequency air conditioner is in a refrigeration mode or a dehumidification mode, monitoring the temperature of the inner coil; when the temperature of the inner coil is less than or equal to a first preset temperature, determining that the fixed-frequency air conditioner is in a low-temperature refrigeration or dehumidification state; and controlling the operating voltage of the outer fan and the windshield of the inner fan based on the temperature of the inner coil. The invention can adjust the temperature of the inner coil, can prevent the indoor evaporator from frosting, can ensure that the fixed-frequency air conditioner can normally operate under the working condition of low-temperature refrigeration or dehumidification, meets the low-temperature refrigeration requirement of a user, and improves the user experience.

Description

Air conditioner control method and device under low-temperature refrigeration and fixed-frequency air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner control method and device under low-temperature refrigeration and a fixed-frequency air conditioner.
Background
At present, the user is also more and more to the refrigeration demand of air conditioner under low temperature environment, when the air conditioner refrigerates under low temperature environment, lead to indoor set evaporimeter frosting easily, the operating frequency and the outer fan rotational speed of current fixed frequency air conditioner all can't be adjusted, for preventing indoor set evaporimeter frosting, when the fixed frequency air conditioner refrigerates at low temperature, usually control compressor stall when the coil pipe temperature is lower in order to avoid indoor evaporimeter frosting, lead to the fixed frequency air conditioner incapability output at low temperature easily, can't satisfy the low temperature refrigeration demand, user experience has been reduced.
Disclosure of Invention
In order to solve the problems, the invention provides an air conditioner control method and device under low-temperature refrigeration and a fixed-frequency air conditioner, which can adjust the temperature of an inner coil, prevent an indoor evaporator from frosting, enable the fixed-frequency air conditioner to normally operate under the working condition of low-temperature refrigeration or dehumidification, meet the low-temperature refrigeration requirement of a user and improve the user experience.
According to an embodiment of the present invention, on the one hand, there is provided an air conditioner control method under low temperature refrigeration, which is applied to a fixed frequency air conditioner, and the air conditioner control method under low temperature refrigeration includes: when the fixed-frequency air conditioner is in a refrigeration mode or a dehumidification mode, monitoring the temperature of an inner coil; when the temperature of the inner coil is less than or equal to a first preset temperature, determining that the fixed-frequency air conditioner is in a low-temperature refrigeration or dehumidification state; and controlling the operating voltage of the outer fan and the windshield of the inner fan based on the temperature of the inner coil.
Through adopting above-mentioned technical scheme, when the fixed frequency air conditioner is in low temperature refrigeration or dehumidification operating mode, according to the outer fan operating voltage of interior coil pipe temperature adjustment, in order to realize the control of external fan rotational speed, through controlling external fan rotational speed and interior fan rotational speed, in order to adjust air conditioning unit's system pressure, and then adjust interior coil pipe temperature, can prevent that the indoor evaporimeter from frosting, can also make the fixed frequency air conditioner can normal operating under low temperature refrigeration or dehumidification operating mode, user's low temperature refrigeration demand has been satisfied, user experience has been promoted.
Preferably, a thyristor is arranged in the controller of the fixed-frequency air conditioner, the output end of the thyristor is connected with the motor of the outer fan, and the step of controlling the operating voltage of the outer fan based on the temperature of the inner coil pipe comprises the following steps: and adjusting the conduction proportion of the controllable silicon based on the temperature of the inner disc so as to control the operating voltage of the outer fan.
By adopting the technical scheme, the conduction proportion of the controllable silicon is adjusted, so that the output voltage of the controllable silicon is changed, the operating voltage of the external fan is changed, and the purpose of adjusting the rotating speed of the external fan is achieved.
Preferably, the step of controlling the operating voltage of the outer fan and the damper of the inner fan based on the temperature of the inner coil includes: and when the temperature of the inner coil pipe is higher than a second preset temperature and is lower than or equal to the first preset temperature, controlling the conduction ratio of the controllable silicon to be decreased by a first preset ratio at preset intervals.
Through adopting above-mentioned technical scheme, when interior coil pipe temperature is lower, the proportion of switching on of control silicon controlled rectifier slowly descends to slowly reduce outer fan rotational speed, avoid outer fan rotational speed to descend too fast and influence the refrigeration effect, promoted air conditioning system's high pressure, slowed down the falling speed of interior coil pipe temperature, guarantee the normal refrigeration or the operation that dehumidifies of fixed frequency air conditioner low temperature, promoted user experience.
Preferably, the method further comprises the following steps: when the temperature of the inner coil pipe is higher than a third preset temperature and lower than or equal to the second preset temperature, controlling the conduction ratio of the controllable silicon to be reduced by a second preset ratio at preset intervals, and if the controllable conduction ratio is reduced to a preset minimum ratio, controlling the conduction ratio of the controllable silicon to keep the preset minimum ratio unchanged; wherein the second preset proportion is greater than the first preset proportion; and judging whether the current inner fan windshield is smaller than the maximum windshield, if so, controlling the inner fan windshield to increase a preset windshield, and if not, controlling the inner fan windshield to keep the maximum windshield running.
Through adopting above-mentioned technical scheme, the falling speed increase of control silicon controlled rectifier to accelerate the falling speed of outer fan rotational speed, fan windscreen in improving when the fan windscreen is not the biggest windscreen simultaneously, in order promoting low pressure, avoid interior coil pipe temperature to hang down excessively and make the evaporimeter frosting, guarantee that the air conditioner can normal operating under the low temperature refrigeration, satisfy user's demand.
Preferably, the method further comprises the following steps: and when the temperature of the inner coil pipe is higher than a fourth preset temperature and lower than or equal to a third preset temperature, controlling the running voltage of the outer fan to be 0 so as to stop the outer fan from running, judging whether the current inner fan windshield is smaller than the maximum windshield or not, if so, controlling the inner fan windshield to increase the preset windshield, and if not, controlling the inner fan windshield to keep the maximum windshield running.
Through adopting above-mentioned technical scheme, when interior coil pipe temperature continues to reduce to lower value, the outer fan stall of control improves interior fan rotational speed simultaneously, avoids interior coil pipe temperature to hang down excessively to make the evaporimeter frost for air conditioner can normal operating under the low temperature refrigeration, has promoted the reliability of the refrigeration operation under the air conditioner low temperature.
Preferably, the method further comprises the following steps: and when the temperature of the inner coil pipe is less than or equal to the fourth preset temperature, controlling the compressor to stop running, and controlling the windshield of the inner fan to recover to the set windshield running.
Through adopting above-mentioned technical scheme to make the air conditioner stop refrigeration, the compressor protection is shut down, prevents that the indoor evaporator from frosting.
Preferably, the method further comprises the following steps: and when the temperature of the inner coil pipe is higher than the first preset temperature, controlling the windshield of the inner fan to recover to the set windshield operation, controlling the compressor to recover to operate, and controlling the conduction ratio of the controllable silicon to recover to 100% so as to enable the outer fan to operate according to the set rotating speed.
Through adopting above-mentioned technical scheme, when detecting that interior coil pipe temperature resumes to higher temperature, the outer fan rotational speed of control air conditioner, interior fan windscreen and compressor all resume original running state to guarantee the normal heating or the dehumidification operation of air conditioner, satisfied user's low temperature refrigeration demand.
According to an embodiment of the present invention, in another aspect, there is provided an air conditioning control device under low temperature refrigeration, which is applied to a fixed frequency air conditioner, the air conditioning control device under low temperature refrigeration including: the monitoring module is used for monitoring the temperature of the inner coil when the fixed-frequency air conditioner operates in a refrigeration mode or a dehumidification mode; the determining module is used for determining that the fixed-frequency air conditioner is in a low-temperature refrigeration or dehumidification state when the temperature of the inner coil is less than or equal to a first preset temperature; and the control module is used for controlling the operating voltage of the outer fan and the windshield of the inner fan based on the temperature of the inner coil.
According to an embodiment of the present invention, in another aspect, there is provided a constant-frequency air conditioner, including a thyristor and a controller, where the thyristor is disposed on the controller, and the controller includes a computer-readable storage medium storing a computer program and a processor, and when the computer program is read by the processor and executed, the method according to any one of the first aspect is implemented.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: through when the fixed frequency air conditioner is in low temperature refrigeration or dehumidification operating mode, according to the outer fan operating voltage of interior coil pipe temperature adjustment, in order to realize the control of external fan rotational speed, through controlling external fan rotational speed and interior fan rotational speed, in order to adjust air conditioning unit's system pressure, and then adjust interior coil pipe temperature, can prevent that the indoor evaporator from frosting, can also make the fixed frequency air conditioner can normal operating under low temperature refrigeration or dehumidification operating mode, user's low temperature refrigeration demand has been satisfied, user experience has been promoted.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of a method for controlling an air conditioner under low-temperature refrigeration according to the present invention;
fig. 2 is a schematic structural diagram of an air conditioner control device under low-temperature refrigeration provided by the invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The present embodiment provides a method for controlling an air conditioner under low-temperature refrigeration, which may be applied to a fixed-frequency air conditioner, and refer to a flowchart of the method for controlling the air conditioner under low-temperature refrigeration shown in fig. 1, where the method mainly includes the following steps S102 to S106:
step S102: when the fixed-frequency air conditioner is in a cooling mode or a dehumidifying mode, the temperature of the inner coil is monitored.
The running frequency of the compressor of the fixed-frequency air conditioner and the windshield of the outer fan cannot be adjusted, namely, the compressor runs at a fixed set frequency, and the outer fan runs at a fixed set rotating speed. When the constant-frequency air conditioner is detected to operate in a cooling mode or a dehumidification mode, an outer fan of the constant-frequency air conditioner operates at a set rotating speed, an inner fan operates at a set windshield (the set windshield can be a windshield set by a user or a default windshield), and the temperature of a coil of an indoor unit is detected in real time based on a temperature sensor and is recorded as the temperature of an inner coil.
Step S104: and when the temperature of the inner coil is less than or equal to a first preset temperature, determining that the fixed-frequency air conditioner is in a low-temperature refrigeration or dehumidification state.
The value range of the first preset temperature can be 3-8 ℃, the preferred value is 5 ℃, and when the temperature of the inner coil of the fixed-frequency air conditioner is lower than the first preset temperature, the current temperature of the inner coil is lower, and the fixed-frequency air conditioner is in a refrigeration or dehumidification state at low temperature.
Step S106: and controlling the operating voltage of the outer fan and the windshield of the inner fan based on the temperature of the inner coil.
When the fixed-frequency air conditioner is used for refrigerating or dehumidifying at low temperature, the inner fan windshield is controlled according to the detected temperature interval of the inner coil pipe, the operating voltage of the outer fan is controlled, and the rotating speed of the outer fan is adjusted by controlling the voltage of the outer fan.
In a specific implementation mode, because the power chip can output various voltages, the output end of the power chip can be connected with a motor of the external fan, and different pulse instructions are input into the power chip to control the output voltage of the power chip, so that the purpose of controlling the operating voltage of the external fan is achieved.
The air conditioner control method under the low-temperature refrigeration provided by the embodiment adjusts the operation voltage of the outer fan according to the temperature of the inner coil when the fixed-frequency air conditioner is in the low-temperature refrigeration or dehumidification working condition, so as to realize the control of the rotating speed of the outer fan, the rotating speed of the outer fan and the rotating speed of the inner fan are controlled, so as to adjust the system pressure of the air conditioning unit, further adjust the temperature of the inner coil, not only can prevent the indoor evaporator from frosting, but also can enable the fixed-frequency air conditioner to normally operate under the low-temperature refrigeration or dehumidification working condition, so that the low-temperature refrigeration requirement of a user is met, and the user experience is improved.
In a feasible implementation manner, in order to quickly and accurately control the operating voltage of the external fan, a thyristor is arranged in the controller of the fixed-frequency air conditioner, and the output end of the thyristor is connected with the external fan motor, and this embodiment provides a specific implementation manner for controlling the operating voltage of the external fan based on the temperature of the internal coil: and adjusting the conduction ratio of the controllable silicon based on the temperature of the inner disc so as to control the operating voltage of the outer fan.
The output end of the controllable silicon can be the control output end of an outer fan of the controller, the control output end of the outer fan is connected with the outer fan motor and used for providing voltage for the outer fan motor, a control chip in the controller is connected with the controllable silicon, and the output percentage, namely the conduction proportion, of the controllable silicon is changed by changing the conduction angle (angle phase) of sine alternating current flowing to the controllable silicon. The output voltage of the controllable silicon is changed by adjusting the conduction proportion of the controllable silicon, so that the operating voltage of the external fan is changed, and the purpose of adjusting the rotating speed of the external fan is achieved.
In a possible implementation manner, this embodiment provides an implementation manner of controlling the operating voltage of the outer fan and the damper of the inner fan based on the temperature of the inner coil, and may be specifically executed with reference to the following steps (1) to (4):
step (1): when the temperature of the inner coil pipe is higher than the second preset temperature and lower than or equal to the first preset temperature, the conduction ratio of the controllable silicon is controlled to be reduced by a first preset ratio at preset intervals.
The value range of the second preset temperature can be 1-4 ℃, and the preferred value is 2 ℃. The value range of the preset duration can be 5-15 s, and the optimal value is 10 s. The first predetermined ratio may be 1% to 2%, and a preferable value is 1%. The control range of the conduction ratio of the controllable silicon can be 100-30%.
If the temperature of the inner coil pipe is detected to be higher than the second preset temperature and lower than the first preset temperature, the fixed-frequency air conditioner is in a low-temperature refrigeration working condition, the inner fan windshield is controlled to keep the set windshield running, the conduction proportion of the silicon controlled rectifier is controlled to decrease by the first preset proportion every preset time, and when the temperature of the inner coil pipe is lower, the conduction proportion of the silicon controlled rectifier is controlled to decrease slowly, so that the rotating speed of the outer fan is reduced slowly, the refrigeration effect is prevented from being influenced by the fact that the rotating speed of the outer fan decreases too fast, the high-pressure of the air conditioning system is improved, the decreasing speed of the temperature of the inner coil pipe is slowed down, the normal refrigeration or dehumidification running of the fixed-frequency air conditioner at the low temperature is guaranteed, and the user experience is improved.
Step (2): when the temperature of the inner coil is higher than a third preset temperature and lower than or equal to a second preset temperature, controlling the conduction ratio of the controllable silicon to be reduced by a second preset ratio at preset time intervals, and if the controllable conduction ratio is reduced to a preset minimum ratio, controlling the conduction ratio of the controllable silicon to keep the preset minimum ratio unchanged; and judging whether the current inner fan windshield is smaller than the maximum windshield or not, if so, controlling the inner fan windshield to increase to a preset windshield, and if not, controlling the inner fan windshield to keep the maximum windshield running.
The value range of the third preset temperature can be-1-2 ℃, and the preferred value is 0 ℃. The second preset proportion is greater than the first preset proportion, and the value range of the second preset proportion can be 2% -4%, and the preferred value is 2%.
When the temperature of the inner coil pipe is higher than a third preset temperature and lower than or equal to the second preset temperature, the conduction proportion of the controllable silicon is controlled to periodically decrease by a second preset proportion until the conduction proportion is reduced to a preset minimum proportion of 30% and then is kept unchanged, meanwhile, when the current inner fan windshield is not the maximum windshield, the inner fan windshield is controlled to be raised by one windshield, and if the current inner fan windshield is the maximum windshield, the inner fan windshield is controlled to keep the maximum windshield to operate.
If the temperature of the inner coil pipe is reduced to be lower than the second preset temperature, the temperature of the inner coil pipe is shown to be reduced continuously, the reduction speed of the rotating speed of the outer fan is increased by controlling the silicon controlled rectifier, meanwhile, the windshield of the inner fan is improved when the windshield of the inner fan is not the maximum windshield, the low-pressure is improved, the temperature of the inner coil pipe is prevented from further and rapidly reducing, the normal operation of the air conditioner under low-temperature refrigeration is guaranteed, and the user requirements are met.
And (3): and when the temperature of the inner coil pipe is higher than the fourth preset temperature and lower than or equal to the third preset temperature, controlling the running voltage of the outer fan to be 0 so as to stop the outer fan from running, judging whether the current inner fan windshield is smaller than the maximum windshield or not, if so, controlling the inner fan windshield to increase the preset windshield, and if not, controlling the inner fan windshield to keep the maximum windshield running.
The value range of the fourth preset temperature is-3 ℃ to 0 ℃, and the preferred value is-1 ℃. If the temperature of the inner coil pipe is continuously reduced to be lower than a third preset temperature, in order to avoid frosting of an indoor evaporator, the outer fan is controlled to stop rotating, meanwhile, when the current inner fan windshield is not the maximum windshield, the inner fan windshield is controlled to be lifted by one windshield, and if the current inner fan windshield is the maximum windshield, the inner fan windshield is controlled to keep the maximum windshield to operate.
When the temperature of the inner coil pipe is continuously reduced to a lower value, the stop rotation of the outer fan is controlled, the rotating speed of the inner fan is increased, the phenomenon that the temperature of the inner coil pipe is too low to cause the evaporator to frost is avoided, the air conditioner can normally operate under low-temperature refrigeration, and the reliability of the low-temperature refrigeration operation of the air conditioner is improved.
And (4): and when the temperature of the inner coil pipe is less than or equal to the fourth preset temperature, controlling the compressor to stop running and controlling the windshield of the inner fan to recover to the set windshield running.
If the temperature of the inner coil pipe is further reduced and the temperature of the inner coil pipe is possibly too low, the compressor is controlled to stop running, the inner fan is controlled to recover the original set windshield running, so that the air conditioner stops refrigerating, the compressor is protected to stop running, and the indoor evaporator is prevented from frosting.
In a possible implementation manner, the air conditioning control method under low-temperature refrigeration provided in this embodiment further includes: when the temperature of the inner coil pipe is higher than a first preset temperature, the inner fan windshield is controlled to recover to the set windshield operation, the compressor is controlled to recover to the operation, and the conduction proportion of the controllable silicon is controlled to recover to 100% so that the outer fan operates according to the set rotating speed.
In the air conditioner control process under low-temperature refrigeration, namely in the process of reducing or stopping the rotating speed of the outer fan, if the temperature of the inner coil pipe is detected to be recovered to be higher than a first preset temperature, the conduction proportion of the controllable silicon is controlled to be recovered to 100%, the outer fan operates according to a fixed set rotating speed, the rotating speed of the inner fan is controlled to recover to a set windshield, and if the compressor is in a running stop state, the compressor is controlled to synchronously recover to operate.
When the temperature of the inner coil pipe is detected to be recovered to a higher temperature, the rotating speed of the outer fan, the windshield of the inner fan and the compressor of the air conditioner are controlled to recover the original running state, so that the normal heating or dehumidifying operation of the air conditioner is ensured, and the low-temperature refrigeration requirement of a user is met.
According to the air conditioner control method under low-temperature refrigeration, aiming at a fixed-frequency air conditioner, the silicon controlled rectifier is additionally arranged on the controller, so that the operating voltage of the external fan is adjusted by adjusting the conduction proportion of the silicon controlled rectifier, and the purpose of adjusting the rotating speed of the external fan is further achieved; the rotating speed of the outer fan and the windshield of the inner fan are adjusted according to the temperature of the inner coil by detecting the temperature of the coil of the evaporator of the indoor unit so as to control the temperature of the inner coil, and the air conditioner can normally run under low-temperature refrigeration.
Corresponding to the air conditioner control method under low-temperature refrigeration provided by the embodiment, the embodiment of the invention provides an example of controlling the internal and external fans of the fixed-frequency air conditioner under low-temperature refrigeration by applying the air conditioner control method under low-temperature refrigeration, and the method can be specifically executed by referring to the following steps 1 to 5:
when the air conditioner operates in a refrigerating or dehumidifying mode, the rotating speed of the outer fan is controlled to maintain the set rotating speed to operate, namely the output conduction proportion of the controllable silicon is controlled to be 100%, and the inner fan operates according to the set wind gear; detecting the temperature T of the inner coil pipe after 1minInner discAnd controlling the rotating speed of the inner fan and the rotating speed of the outer fan according to the temperature of the inner coil.
In the step 1, the method comprises the following steps of,when T isInner discWhen the temperature is higher than T1 (the range of T1 is 3-8 ℃, 5 ℃ is recommended), the rotating speed of the outer fan is controlled to maintain the set rotating speed to operate, and the windshield of the inner fan is controlled to maintain the set wind shield unchanged;
step 2, when T is reachedInner discWhen the voltage is less than or equal to T1, controlling the output conduction proportion alpha% of the controlled silicon to decrease by 1% every 10S;
step 3, when T is reachedInner discWhen the wind speed is less than or equal to T2 (the range of T2 is 1-4 ℃, 2 ℃ is recommended), controlling the output conduction proportion alpha% of the controllable silicon to be reduced by 2% every 10S (the wind speed is kept unchanged after the output conduction proportion alpha% is reduced to 30% at the lowest), and controlling the windshield of the inner fan to be lifted by 1 gear (if the wind speed is the highest, the highest windshield is kept unchanged);
step 4, when T is reachedInner discWhen the wind speed is less than or equal to T3 (the range of T3 is minus 1-2 ℃, 0 ℃ is recommended), controlling the outer fan to stop running, and controlling the windshield of the inner fan to rise by 1 gear again (if the highest wind gear is adopted, the highest wind gear is maintained unchanged);
step 5, when T is reachedInner discAnd when the temperature is less than or equal to T4 (the range of T4 is-3-0 ℃, and the temperature is recommended to be-1 ℃), controlling the compressor to stop running, and controlling the windshield of the inner fan to recover to the set wind gear running.
During the reduction or stop of the speed of the external fan, e.g. TInner discIf the output conduction proportion is larger than T1, the output conduction proportion alpha% of the controllable silicon is controlled to recover 100% operation, namely the rotating speed of the outer fan is controlled to recover to the set rotating speed to operate, and the windshield of the inner fan is controlled to recover to the set wind gear (if the compressor stops, the compressor is synchronously recovered to operate).
In the air conditioner control method under low-temperature refrigeration provided by the embodiment, the controllable silicon is added on the controller when T is reachedInner discWhen the rotating speed is higher, the rotating speeds of the inner fan and the outer fan normally operate according to a set value; when T isInner discWhen the pressure is reduced, the rotating speed of the outer fan is slowly reduced firstly to improve the high-pressure of the system (if the rotating speed is reduced too fast, the refrigeration effect is influenced), and the T is reducedInner discThe lowering speed of (1); if the inner disc temperature continues to be reduced to a certain value, the speed of the outer fan rotating speed is increased (until the outer fan rotating speed stops), the rotating speed of the inner fan is increased (the low-pressure can be increased), the inner disc is prevented from being too low, the evaporator frosts, the normal operation of the air conditioner under low-temperature refrigeration is guaranteed, and the user requirements are met.
Corresponding to the air conditioner control method under low-temperature refrigeration provided by the above embodiment, an embodiment of the present invention provides an air conditioner control device under low-temperature refrigeration, which can be applied to a fixed-frequency air conditioner, see the schematic structural diagram of the air conditioner control device under low-temperature refrigeration shown in fig. 2, and the device includes the following modules:
and the monitoring module 21 is used for monitoring the temperature of the inner coil when the fixed-frequency air conditioner is in a cooling mode or a dehumidifying mode.
The determining module 22 is configured to determine that the fixed-frequency air conditioner is in a low-temperature refrigeration or dehumidification state when the temperature of the inner coil is less than or equal to a first preset temperature.
And the control module 23 is used for controlling the operating voltage of the outer fan and the windshield of the inner fan based on the temperature of the inner coil.
The above-mentioned air conditioner control device under refrigeration of low temperature that this embodiment provided, through when the fixed frequency air conditioner is in refrigeration of low temperature or dehumidification operating mode, according to the outer fan running voltage of interior coil pipe temperature adjustment, in order to realize the control of external fan rotational speed, through controlling external fan rotational speed and interior fan rotational speed, in order to adjust air conditioning unit's system pressure, and then adjust interior coil pipe temperature, can prevent that the indoor evaporimeter from frosting, can also make the fixed frequency air conditioner can normal operating under refrigeration of low temperature or dehumidification operating mode, user's low temperature refrigeration demand has been satisfied, user experience has been promoted.
In an embodiment, the control module 23 is further configured to adjust a conduction ratio of the thyristor based on the temperature of the inner disk, so as to control the operating voltage of the external fan.
In an embodiment, the control module 23 is further configured to control the conduction ratio of the thyristor to decrease by a first preset ratio every preset time interval when the temperature of the inner coil is greater than the second preset temperature and less than or equal to the first preset temperature.
In an embodiment, the control module 23 is further configured to control the conduction ratio of the thyristor to decrease by a second preset ratio every preset time interval when the temperature of the inner coil is greater than a third preset temperature and less than or equal to the second preset temperature, and control the conduction ratio of the thyristor to keep the preset minimum ratio unchanged if the controllable conduction ratio decreases to the preset minimum ratio; wherein the second preset proportion is greater than the first preset proportion; and judging whether the current inner fan windshield is smaller than the maximum windshield or not, if so, controlling the inner fan windshield to increase to a preset windshield, and if not, controlling the inner fan windshield to keep the maximum windshield running.
In an embodiment, the control module 23 is further configured to control the operating voltage of the outer fan to be 0 when the temperature of the inner coil is greater than a fourth preset temperature and less than or equal to a third preset temperature, so that the outer fan stops operating, determine whether the current windshield of the inner fan is less than the maximum windshield, if so, control the windshield of the inner fan to increase the preset windshield, and if not, control the windshield of the inner fan to keep the maximum windshield operating.
In an embodiment, the control module 23 is further configured to control the compressor to stop operating and control the damper of the inner fan to return to the set damper operation when the temperature of the inner coil is less than or equal to a fourth preset temperature.
In an embodiment, the control module 23 is further configured to control the damper of the inner fan to return to the set damper operation when the temperature of the inner coil is greater than a first preset temperature, control the compressor to return to operation, and control the conduction ratio of the thyristor to return to 100%, so that the outer fan operates at the set rotation speed.
According to the air conditioner control device under low-temperature refrigeration, the silicon controlled rectifier is additionally arranged on the controller of the fixed-frequency air conditioner, so that the operating voltage of the external fan can be adjusted by adjusting the conduction proportion of the silicon controlled rectifier, and the purpose of adjusting the rotating speed of the external fan is further achieved; the rotating speed of the outer fan and the windshield of the inner fan are adjusted according to the temperature of the inner coil by detecting the temperature of the coil of the evaporator of the indoor unit so as to control the temperature of the inner coil, and the air conditioner can normally run under low-temperature refrigeration.
Corresponding to the air conditioner control method under low-temperature refrigeration provided by the above embodiment, the embodiment provides a fixed-frequency air conditioner, the air conditioner includes a thyristor and a controller, the thyristor is disposed on the controller, the controller includes a computer readable storage medium storing a computer program and a processor, and when the computer program is read and executed by the processor, the air conditioner control method under low-temperature refrigeration provided by the above embodiment is implemented.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the above embodiments of the air conditioner control method under low-temperature refrigeration, and can achieve the same technical effects, and in order to avoid repetition, the details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
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.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The air conditioner control device and the air conditioner under low-temperature refrigeration disclosed in the embodiments correspond to the air conditioner control method under low-temperature refrigeration disclosed in the embodiments, so that the description is relatively simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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 (10)

1. The air conditioner control method under low-temperature refrigeration is characterized by being applied to a fixed-frequency air conditioner and comprising the following steps:
when the fixed-frequency air conditioner is in a refrigeration mode or a dehumidification mode, monitoring the temperature of an inner coil;
when the temperature of the inner coil is less than or equal to a first preset temperature, determining that the fixed-frequency air conditioner is in a low-temperature refrigeration or dehumidification state;
and controlling the operating voltage of the outer fan and the windshield of the inner fan based on the temperature of the inner coil.
2. The method for controlling the air conditioner under the low temperature refrigeration as claimed in claim 1, wherein a thyristor is provided in the controller of the fixed frequency air conditioner, an output end of the thyristor is connected with an external fan motor, and the step of controlling the operating voltage of the external fan based on the temperature of the internal coil pipe comprises:
and adjusting the conduction proportion of the controllable silicon based on the temperature of the inner disc so as to control the operating voltage of the outer fan.
3. The method as claimed in claim 2, wherein the step of controlling the operating voltage of the external fan and the damper of the internal fan based on the temperature of the internal coil includes:
and when the temperature of the inner coil pipe is higher than a second preset temperature and is lower than or equal to the first preset temperature, controlling the conduction ratio of the controllable silicon to be decreased by a first preset ratio at preset intervals.
4. The method for controlling an air conditioner under low temperature refrigeration according to claim 3, further comprising:
when the temperature of the inner coil pipe is higher than a third preset temperature and lower than or equal to the second preset temperature, controlling the conduction ratio of the controllable silicon to be reduced by a second preset ratio at preset intervals, and if the controllable conduction ratio is reduced to a preset minimum ratio, controlling the conduction ratio of the controllable silicon to keep the preset minimum ratio unchanged; wherein the second preset proportion is greater than the first preset proportion;
and judging whether the current inner fan windshield is smaller than the maximum windshield, if so, controlling the inner fan windshield to increase a preset windshield, and if not, controlling the inner fan windshield to keep the maximum windshield running.
5. The method for controlling an air conditioner under low temperature refrigeration according to claim 4, further comprising:
and when the temperature of the inner coil pipe is higher than a fourth preset temperature and lower than or equal to a third preset temperature, controlling the running voltage of the outer fan to be 0 so as to stop the outer fan from running, judging whether the current inner fan windshield is smaller than the maximum windshield or not, if so, controlling the inner fan windshield to increase the preset windshield, and if not, controlling the inner fan windshield to keep the maximum windshield running.
6. The method for controlling an air conditioner under low temperature refrigeration according to claim 5, further comprising:
and when the temperature of the inner coil pipe is less than or equal to the fourth preset temperature, controlling the compressor to stop running, and controlling the windshield of the inner fan to recover to the set windshield running.
7. The method for controlling an air conditioner under low temperature refrigeration according to any one of claims 2 to 6, further comprising:
and when the temperature of the inner coil pipe is higher than the first preset temperature, controlling the windshield of the inner fan to recover to the set windshield operation, controlling the compressor to recover to operate, and controlling the conduction ratio of the controllable silicon to recover to 100% so as to enable the outer fan to operate according to the set rotating speed.
8. The utility model provides an air conditioner controlling means under low temperature refrigeration which characterized in that is applied to the fixed frequency air conditioner, air conditioner controlling means under low temperature refrigeration includes:
the monitoring module is used for monitoring the temperature of the inner coil when the fixed-frequency air conditioner operates in a refrigeration mode or a dehumidification mode;
the determining module is used for determining that the fixed-frequency air conditioner is in a low-temperature refrigeration or dehumidification state when the temperature of the inner coil is less than or equal to a first preset temperature;
and the control module is used for controlling the operating voltage of the outer fan and the windshield of the inner fan based on the temperature of the inner coil.
9. A fixed frequency air conditioner comprising a thyristor and a controller, the thyristor being disposed on the controller, the controller comprising a computer readable storage medium having a computer program stored thereon and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1-7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-7.
CN202210017609.4A 2022-01-07 2022-01-07 Air conditioner control method and device under low-temperature refrigeration and fixed-frequency air conditioner Pending CN114427739A (en)

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CN114811897A (en) * 2022-05-27 2022-07-29 宁波奥克斯电气股份有限公司 Dehumidification control method and device of fixed-frequency air conditioner and air conditioner

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CN111457556A (en) * 2020-04-21 2020-07-28 宁波奥克斯电气股份有限公司 Anti-freezing protection method and device, air conditioner and computer readable storage medium
CN111878960A (en) * 2020-05-27 2020-11-03 宁波奥克斯电气股份有限公司 Control method and device for low-temperature refrigeration operation of air conditioner and air conditioner

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Publication number Priority date Publication date Assignee Title
CN107560063A (en) * 2017-08-09 2018-01-09 宁波奥克斯电气股份有限公司 The control method of low-temperature refrigeration air conditioner
CN111457556A (en) * 2020-04-21 2020-07-28 宁波奥克斯电气股份有限公司 Anti-freezing protection method and device, air conditioner and computer readable storage medium
CN111878960A (en) * 2020-05-27 2020-11-03 宁波奥克斯电气股份有限公司 Control method and device for low-temperature refrigeration operation of air conditioner and air conditioner

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Application publication date: 20220503