CN111780382A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
CN111780382A
CN111780382A CN202010682237.8A CN202010682237A CN111780382A CN 111780382 A CN111780382 A CN 111780382A CN 202010682237 A CN202010682237 A CN 202010682237A CN 111780382 A CN111780382 A CN 111780382A
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CN
China
Prior art keywords
temperature
outdoor
air conditioner
gear
temperature difference
Prior art date
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Pending
Application number
CN202010682237.8A
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Chinese (zh)
Inventor
闫付强
赵站稳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hisense Shandong Air Conditioning Co Ltd
Original Assignee
Hisense Shandong Air Conditioning Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Hisense Shandong Air Conditioning Co Ltd filed Critical Hisense Shandong Air Conditioning Co Ltd
Priority to CN202010682237.8A priority Critical patent/CN111780382A/en
Publication of CN111780382A publication Critical patent/CN111780382A/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
    • F24F11/70—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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/873—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling refrigerant heaters
    • 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

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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)
  • Human Computer Interaction (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner, comprising: an outdoor unit including: the electric heating belt is used for heating the lubricating oil of the compressor so as to evaporate liquid refrigerant in the lubricating oil; an outdoor fan for supplying outdoor air to the outdoor heat exchanger; and the control section is configured to include: acquiring the exhaust temperature of a compressor, the temperature of an outdoor coil and the outdoor environment temperature; when the air conditioner is detected to enter a low-temperature refrigeration control mode, determining the exhaust superheat degree according to the exhaust temperature and the outdoor coil temperature; controlling the working state of the electric heating belt according to the exhaust superheat degree; and calculating the temperature difference between the temperature of the outdoor coil and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference. The invention discloses an air conditioner, which can improve the high-low pressure of an air conditioner system in the air conditioner for realizing low-temperature refrigeration control by controlling the running states of an outdoor fan and an electric heating belt.

Description

Air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner which controls low-temperature refrigeration by controlling the running states of an outdoor fan and an electric heating belt.
Background
At present, with the continuous pursuit of people for healthy life, places such as gymnasiums, bath centers and the like are continuously increased, the temperature and the humidity of indoor environments of the places are still high in winter, and users still have the requirements of refrigeration and dehumidification in the environments. There are also the following problems in the actual use of the air conditioner: when the air conditioner performs refrigeration and dehumidification operation in an outdoor low-temperature environment, the air conditioner operates in a low-temperature refrigeration mode, and the problems of hydraulic compression, difficult oil return and the like of a compressor are caused due to the fact that the high pressure and the low pressure of a system are low in the low-temperature refrigeration mode, and the operation reliability of the air conditioner is influenced.
Disclosure of Invention
The embodiment of the invention provides an air conditioner, which can improve the high-low pressure of an air conditioner system in the air conditioner for controlling low-temperature refrigeration by controlling the running states of an outdoor fan and an electric heating belt.
An air conditioner provided in a first embodiment of the present invention includes:
an outdoor unit including:
the electric heating belt is used for heating the lubricating oil of the compressor so as to evaporate liquid refrigerant in the lubricating oil;
an outdoor fan for supplying outdoor air to the outdoor heat exchanger;
and the control section is configured to include:
acquiring the exhaust temperature of a compressor, the temperature of an outdoor coil and the outdoor environment temperature;
when the air conditioner is detected to enter a low-temperature refrigeration control mode, determining the exhaust superheat degree according to the exhaust temperature and the outdoor coil temperature;
controlling the working state of the electric heating belt according to the exhaust superheat degree;
and calculating the temperature difference between the temperature of the outdoor coil and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference.
In the air conditioner provided in the first embodiment of the present invention, the high-low pressure of the air conditioner system can be effectively increased by controlling the operating state of the electric heating belt of the compressor and the rotation speed of the outdoor fan in the low-temperature refrigeration control mode. Therefore, the problems of liquid impact, difficult oil return and the like of the compressor caused by the low-temperature refrigeration mode can be effectively solved, the running reliability of the compressor is ensured, the running stability of the air conditioner is improved, meanwhile, no additional control component is required to be added, the air conditioner can be realized only by optimizing the configuration of the control part, and the air conditioner has the characteristics of low cost and easiness in operation.
The air conditioner provided in the second embodiment of the present invention further includes:
an indoor unit, the indoor unit comprising:
a throttling element for performing decompression of the liquid refrigerant;
the control section is configured to further include:
acquiring the temperature of an indoor coil and the temperature of indoor environment;
taking the minimum value of the indoor coil temperature as the minimum indoor coil temperature;
judging whether the temperature of the indoor coil pipe meets all preset triggering conditions or not; the trigger condition is determined by the following formula, and the specific formula is as follows:
Tinner disc>Tmin inner plate+a (1)
TInner disc>TInner ring+b (2)
t≥t1(3)
Wherein, TInner discIs the temperature of the indoor coil，Tmin inner plateIs the minimum indoor coil temperature, TInner ringFor the indoor environment temperature, a is a first judgment coefficient, b is a second judgment coefficient, t is the time length from the moment satisfying the formula (1) and the formula (2) to the current moment, and t is the time length from the moment satisfying the formula (1) and the formula (2) at the same time1A preset duration threshold;
when the temperature of the indoor coil pipe is judged to meet the trigger condition, the opening degree of the throttling element is increased according to the suction superheat degree until the temperature of the indoor coil pipe meets the preset valve opening stopping condition; wherein the suction superheat is determined by the difference between the indoor coil temperature and the minimum indoor coil temperature; the valve opening stopping condition is determined by the following formula, and the specific formula is as follows:
Tinner disc≤Tmin inner plate-c (4)
Wherein c is a third judgment coefficient.
In the air conditioner provided in the second embodiment of the present invention, the throttling element is controlled in the low-temperature refrigeration control mode to solve the problems of fluctuation of the refrigeration capacity and high outlet air temperature of the air conditioner. Therefore, the refrigerating capacity of the air conditioner is greatly stabilized, the refrigerating effect is improved, and the use comfort of a user is improved.
In the air conditioner provided in the third embodiment of the present invention, the control section is configured to further include:
judging whether all preset low-temperature refrigeration control mode entry conditions are met or not according to the outdoor coil temperature and the outdoor environment temperature; the low-temperature refrigeration control mode entering condition comprises that the air conditioner is in a refrigeration or dehumidification mode currently, and the outdoor environment temperature is smaller than a preset first temperature threshold value and the outdoor coil temperature is smaller than a preset second temperature threshold value within a first preset time length;
and when all the low-temperature refrigeration control mode entry conditions are met, judging that the air conditioner enters a low-temperature refrigeration control mode.
In the air conditioner provided in the third embodiment of the present invention, when the outdoor coil temperature and the outdoor environment temperature simultaneously satisfy the condition that the air conditioner is currently in the cooling or dehumidifying mode, and the outdoor environment temperature is less than the preset first temperature threshold and the outdoor coil temperature is less than the preset second temperature threshold within the first preset time period, the air conditioner is considered to enter the low-temperature cooling control mode. Therefore, the running states of the electric heating belt and the outdoor fan are controlled under the condition of being in the low-temperature refrigeration control mode, the fault caused by misoperation can be effectively avoided, and the running reliability of the air conditioner is ensured.
In an air conditioner provided in a fourth embodiment of the present invention, the control section is configured to further include:
when the air conditioner is detected to enter the low-temperature refrigeration control mode, determining the exhaust superheat degree according to the exhaust temperature and the outdoor coil temperature, and specifically comprising the following steps of:
when the air conditioner is detected to enter a low-temperature refrigeration control mode, calculating the difference value between the exhaust temperature and the temperature of the outdoor coil, and determining the exhaust superheat degree according to the difference value;
the controlling the working state of the electric heating belt according to the exhaust superheat degree specifically comprises:
when the exhaust superheat degree is not larger than a preset first exhaust superheat degree threshold value, controlling the electric heating belt to be started until the exhaust superheat degree is larger than a preset second exhaust superheat degree threshold value; wherein the second exhaust superheat threshold is greater than the first exhaust superheat threshold;
and when the exhaust superheat degree is larger than the first exhaust superheat degree threshold value, controlling the electric heating belt to keep a closed working state.
In the air conditioner provided in the fourth embodiment of the present invention, the opening and closing of the electric heating belt is controlled by determining the exhaust superheat degree and the exhaust superheat degree threshold value. When the electric heating belt is opened, the lubricating oil of the compressor is heated, and the liquid refrigerant in the lubricating oil is evaporated into the gaseous refrigerant, so that the possibility of liquid impact of the compressor can be effectively reduced, the running reliability of the compressor is ensured, and the running stability of the air conditioner is improved.
In an air conditioner provided in a fifth embodiment of the present invention, the control section is configured to further include:
when the electric heating belt is in an open working state and the exhaust superheat degree is greater than the second exhaust superheat degree threshold value, judging whether the current first operation time length exceeds a preset first time threshold value; if yes, controlling the electric heating belt to be closed; if not, waiting for the first operation duration to exceed the first time threshold; the first operation duration is the duration from the starting time of the electric heating belt to the current time;
when the electric heating belt is in a closed working state and the exhaust superheat degree is not larger than the first exhaust superheat degree threshold value, judging whether the current second operation time length exceeds the second time threshold value or not; if yes, controlling the electric heating belt to be started; if not, waiting for the second operation duration to exceed the second time threshold; and the second operation time length is the time length from the closing time of the electric heating belt to the current time.
In the air conditioner provided in the fifth embodiment of the present invention, once the electric heating belt is turned on or off, a certain time delay is required to perform the turning-off or turning-on operation, which can effectively prevent the electric heating belt from being frequently turned on or off, and prolong the service life of the air conditioner.
In an air conditioner provided in a sixth embodiment of the present invention, the control section is configured to further include:
the calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature and controlling the rotating speed of the outdoor fan according to the temperature difference comprises the following steps:
judging whether the temperature difference reaches a preset target temperature difference interval or not;
and when the temperature difference reaches the target temperature difference interval, controlling the outdoor fan to keep the current rotating speed to operate.
In the air conditioner provided in the sixth embodiment of the present invention, if the current temperature difference reaches the target temperature difference interval, the outdoor fan keeps the current gear operating, so as to effectively improve the high-low pressure of the air conditioner system and ensure the reliability of the operation of the air conditioner.
In an air conditioner provided in a seventh embodiment of the present invention, the control section is configured to further include:
calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference, and the method further comprises the following steps:
when the temperature difference is larger than the upper limit value of the target temperature difference interval, controlling the outdoor fan to operate at an (i + 1) th gear; the ith gear is the current gear of the outdoor fan, and the rotating speed corresponding to the ith gear of the outdoor fan is less than the rotating speed corresponding to the (i + 1) th gear of the outdoor fan;
judging whether the current temperature difference reaches the target temperature difference interval or not every preset time, and judging whether the current gear of the outdoor fan reaches a preset highest gear or not;
when the current temperature difference is judged to reach the target temperature difference interval or the current gear of the outdoor fan reaches the highest gear, controlling the outdoor fan to keep the current gear to operate;
and when the current temperature difference is judged not to reach the target temperature difference interval and the current gear of the outdoor fan does not reach the highest gear, controlling the outdoor fan to operate at the (i + 1) th gear.
In the air conditioner provided in the seventh embodiment of the present invention, if the current temperature difference is greater than the upper limit value of the target temperature difference interval, the gear of the outdoor fan is increased, and the gear of the outdoor fan is adjusted for a preset time period until the current temperature difference reaches the target temperature difference interval or the outdoor fan reaches the highest gear. Therefore, the high-low pressure of the air conditioner system is effectively improved, and the operation reliability of the air conditioner is ensured.
In an air conditioner provided in an eighth embodiment of the present invention, the control section is configured to further include:
calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference, and the method further comprises the following steps:
when the temperature difference is smaller than the lower limit value of the target temperature difference interval, controlling the outdoor fan to operate at an i-1 th gear; the ith gear is the current gear of the outdoor fan, and the rotating speed corresponding to the ith gear of the outdoor fan is greater than the rotating speed corresponding to the (i-1) th gear of the outdoor fan;
judging whether the current temperature difference reaches the target temperature difference interval or not every preset time, and judging whether the current gear of the outdoor fan reaches a preset lowest gear or not;
when the current temperature difference is judged to reach the target temperature difference interval or the current gear of the outdoor fan reaches the lowest gear, controlling the outdoor fan to keep the current gear to operate;
and when the current temperature difference is judged not to reach the target temperature difference interval and the current gear of the outdoor fan does not reach the lowest gear, controlling the outdoor fan to operate at the (i-1) th gear.
In the air conditioner provided in the eighth embodiment of the present invention, if the current temperature difference is smaller than the lower limit value of the target temperature difference interval, the gear of the outdoor fan is reduced, and the gear of the outdoor fan is adjusted for a preset time period until the current temperature difference reaches the target temperature difference interval or the outdoor fan reaches the lowest gear. Therefore, the high-low pressure of the air conditioner system is effectively improved, and the operation reliability of the air conditioner is ensured.
In an air conditioner according to a ninth embodiment of the present invention, the minimum opening degree of the throttling element is 80 steps.
In the air conditioner provided in the ninth embodiment of the present invention, the minimum opening of the throttling element of the indoor unit is limited to 80 steps, so that the fluctuation of the refrigeration capacity of the system can be effectively avoided, and the comfort level of the user can be improved.
In an air conditioner provided in a tenth embodiment of the present invention, the control section is configured to further include:
after the air conditioner enters the low-temperature refrigeration control mode, the method further comprises the following steps:
judging whether at least one preset exit condition of the low-temperature refrigeration control mode is met or not according to the outdoor coil temperature and the outdoor environment temperature; the low-temperature refrigeration control mode exit condition comprises that the current air conditioner is shut down or is in an uncooled dehumidification mode, and the outdoor environment temperature is greater than a preset third temperature threshold value or the outdoor coil temperature is greater than a preset fourth temperature threshold value within a second preset time length;
when at least one exit condition of the low-temperature refrigeration control mode is met, judging that the air conditioner exits the low-temperature refrigeration control mode;
and when the condition for quitting the low-temperature refrigeration control mode is not met, judging that the air conditioner is kept in the low-temperature refrigeration control mode.
In the air conditioner provided in the tenth embodiment of the present invention, when it is detected that the outdoor coil temperature and the outdoor environment temperature meet the condition that the air conditioner is currently in the shutdown mode or in the non-refrigeration dehumidification mode, or the outdoor environment temperature is greater than the preset third temperature threshold value or the outdoor coil temperature is greater than the preset fourth temperature threshold value within the second preset time period, the air conditioner is considered to exit the low-temperature refrigeration control mode. Therefore, the operation is quitted after the high-low pressure of the system is increased to the preset stable state under the condition of ensuring the low-temperature refrigeration control mode, and the running reliability of the air conditioner can be ensured.
The air conditioner provided by the embodiment of the invention has the following beneficial effects:
in the air conditioner provided by the first embodiment of the invention, the high-low pressure of the air conditioner system can be effectively improved, so that the problems of difficult liquid impact and oil return of the compressor and the like caused by a low-temperature refrigeration mode can be effectively solved, the running reliability of the compressor is ensured, the running stability of the air conditioner is improved, meanwhile, no additional control component is required to be added, the air conditioner can be realized only by optimizing the configuration of the control part, and the air conditioner has the characteristics of low cost and easiness in operation.
In the air conditioner provided by the second embodiment of the invention, the problems of fluctuation of the refrigeration capacity of the air conditioner and higher outlet air temperature can be solved, so that the refrigeration capacity of the air conditioner is greatly stabilized, the refrigeration effect is improved, and the use comfort of a user is improved.
In the air conditioner provided by the third embodiment of the invention, the running states of the electric heating belt and the outdoor fan are ensured to be controlled under the condition of being in the low-temperature refrigeration control mode, the fault condition caused by misoperation can be effectively avoided, and the running reliability of the air conditioner is ensured.
In the air conditioner provided by the fourth embodiment of the invention, the possibility of liquid impact of the compressor can be effectively reduced by controlling the working state of the electric heating belt, and the reliability of the operation of the compressor is ensured.
In the air conditioner provided by the fifth embodiment of the invention, frequent start and stop of the electric heating belt can be effectively prevented, and the service life of the air conditioner is prolonged.
In the air conditioner provided by the sixth to eighth embodiments of the present invention, the high-low pressure of the air conditioner system is effectively increased, and the reliability of the operation of the air conditioner unit is ensured.
In the air conditioner provided by the ninth embodiment of the present invention, fluctuation of the refrigeration capacity of the system can be effectively avoided, and the comfort level of the user can be improved.
In the air conditioner provided by the tenth embodiment of the present invention, when the low-temperature refrigeration control mode is ensured, the operation is stopped after the system high-low pressure is increased to the preset stable state, so that the reliability of the operation of the air conditioner can be ensured.
Drawings
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic control flow diagram of a control unit of an air conditioner according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating the operation of the air conditioner entering the low-temperature cooling control mode according to the embodiment of the present invention;
FIG. 4 is a schematic control flow diagram of an electrical heating belt according to an embodiment of the present invention;
fig. 5 is a schematic control flow chart of an outdoor fan according to an embodiment of the present invention;
fig. 6 is a schematic control flow diagram of an electronic expansion valve according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.
The compressor compresses a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.
The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in a cooling mode.
Referring to fig. 1, a schematic structural diagram of an air conditioner according to an embodiment of the present invention is shown, and the air conditioner according to the embodiment of the present invention includes an outdoor unit including an electric heating belt 1 and an outdoor fan 2. The electric heating belt 1 is used for heating lubricating oil of the compressor so as to evaporate liquid refrigerant in the lubricating oil; and an outdoor fan 2 for supplying outdoor air to the outdoor heat exchanger. In the present invention, the control unit 3 includes an outdoor control device built in the outdoor unit and an indoor control device built in the indoor unit. The outdoor control device and the indoor control device are connected to each other by a signal line, and can transmit and receive signals to and from each other. In this embodiment, an outdoor control device in the outdoor unit controls the compressor, the electric heating belt, the outdoor fan, and the like.
In an embodiment, referring to fig. 2, which is a schematic control flow diagram of a control unit of an air conditioner according to an embodiment of the present invention, the control unit 3 is configured to include:
s11, acquiring the exhaust temperature of the compressor, the temperature of the outdoor coil and the outdoor environment temperature;
s12, when the air conditioner is detected to enter a low-temperature refrigeration control mode, determining the exhaust superheat degree according to the exhaust temperature and the outdoor coil temperature;
s13, controlling the working state of the electric heating belt according to the exhaust superheat degree;
and S14, calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference.
In this embodiment, the outdoor unit may detect the outdoor ambient temperature by providing an outdoor temperature sensor; the exhaust temperature of the compressor is detected by arranging an exhaust temperature sensor; the outdoor coil temperature is detected by arranging the outdoor coil temperature sensor. An outdoor control device in the outdoor unit is connected with the outdoor temperature sensor, the exhaust temperature sensor and the outdoor coil temperature sensor so as to receive signals related to the temperatures measured by the outdoor temperature sensor, the exhaust temperature sensor and the outdoor coil temperature sensor.
Because the high pressure and the low pressure of the system are too low in the low-temperature refrigeration control mode, liquid impact is easily caused to affect the reliability of the compressor, the exhaust superheat degree is determined based on the exhaust temperature and the outdoor coil temperature, the working state of the electric heating belt is controlled according to the exhaust superheat degree, and meanwhile, the rotating speed of the outdoor fan 2 is controlled according to the temperature difference between the outdoor coil temperature and the outdoor environment temperature. The working states of the electric heating belt 1 are specifically an open state and a closed state. At the moment, the high-low pressure of the air conditioner system can be effectively improved, the problems of liquid impact, difficult oil return and the like of the compressor caused by the low-temperature refrigeration mode are solved, the running reliability of the compressor is ensured, the running stability of the air conditioner is improved, meanwhile, no additional control component is needed to be added, the air conditioner can be realized only by optimizing the configuration of the control part, and the air conditioner system has the characteristics of low cost and easiness in operation.
In some embodiments, the control section 3 is configured to further include:
judging whether all preset low-temperature refrigeration control mode entry conditions are met or not according to the outdoor coil temperature and the outdoor environment temperature; the low-temperature refrigeration control mode entering condition comprises that the air conditioner is in a refrigeration or dehumidification mode currently, and the outdoor environment temperature is smaller than a preset first temperature threshold value and the outdoor coil temperature is smaller than a preset second temperature threshold value within a first preset time length;
and when all the low-temperature refrigeration control mode entry conditions are met, judging that the air conditioner enters a low-temperature refrigeration control mode.
In this embodiment, only when the outdoor coil temperature and the outdoor environment temperature simultaneously satisfy the condition that the current air conditioner is in the cooling or dehumidifying mode, and the outdoor environment temperature is less than the preset first temperature threshold value and the outdoor coil temperature is less than the preset second temperature threshold value within the first preset time period, the air conditioner is considered to enter the low-temperature cooling control mode. Therefore, the running states of the electric heating belt and the outdoor fan are controlled under the condition of being in the low-temperature refrigeration control mode, the fault caused by misoperation can be effectively avoided, and the running reliability of the air conditioner is ensured.
For example, referring to fig. 3, which is a schematic flow chart of the air conditioner entering the low-temperature cooling control mode according to the embodiment of the present invention, the first preset time period may be preset to 30s, the first temperature threshold may be preset to 15 degrees, and the second temperature threshold may be preset to 30 degrees, so that in the system normal control mode (i.e., the air conditioner is in the cooling or dehumidifying mode), it is determined whether T is satisfiedOuter ring<15 ℃ and TOuter plate<At 30 ℃ for 30 s; if yes, entering a low-temperature refrigeration control mode; if not, the original system normal control mode is kept.
In some embodiments, referring to fig. 4, the schematic control flow diagram of the electric heating belt according to an embodiment of the present invention is shown, where the control portion is configured to further include:
when the air conditioner is detected to enter the low-temperature refrigeration control mode, determining the exhaust superheat degree according to the exhaust temperature and the outdoor coil temperature, and specifically comprising the following steps of:
when the air conditioner is detected to enter a low-temperature refrigeration control mode, calculating the difference value between the exhaust temperature and the temperature of the outdoor coil, and determining the exhaust superheat degree according to the difference value;
the controlling the working state of the electric heating belt according to the exhaust superheat degree specifically comprises:
when the exhaust superheat degree is not larger than a preset first exhaust superheat degree threshold value, controlling the electric heating belt to be started until the exhaust superheat degree is larger than a preset second exhaust superheat degree threshold value; wherein the second exhaust superheat threshold is greater than the first exhaust superheat threshold;
and when the exhaust superheat degree is larger than the first exhaust superheat degree threshold value, controlling the electric heating belt to keep a closed working state.
In this embodiment, the opening and closing of the electric heating belt is controlled by judging the exhaust superheat degree and the exhaust superheat degree threshold value. Specifically, after the air conditioner enters a low-temperature refrigeration control mode, the exhaust temperature and the temperature of an outdoor coil are monitored in real time, and the exhaust superheat degree DSH (total superheat degree) is calculated as TExhaust of gases-TOuter plate. Referring to fig. 4, when the exhaust superheat DSH is less than or equal to 10, the electric heating band is controlled to be opened, and at this time, the lubricating oil of the compressor is heated, so that the liquid refrigerant in the lubricating oil is evaporated into the gaseous refrigerant, thereby effectively preventing the compressor from liquid slugging. And after the electric heating belt is started, detecting whether the exhaust superheat degree is larger than 15 in real time, and if so, controlling the electric heating belt to be closed.
In a specific embodiment, the control portion is configured to further include:
when the electric heating belt is in an open working state and the exhaust superheat degree is greater than the second exhaust superheat degree threshold value, judging whether the current first operation time length exceeds a preset first time threshold value; if yes, controlling the electric heating belt to be closed; if not, waiting for the first operation duration to exceed the first time threshold; the first operation duration is the duration from the starting time of the electric heating belt to the current time;
when the electric heating belt is in a closed working state and the exhaust superheat degree is not larger than the first exhaust superheat degree threshold value, judging whether the current second operation time length exceeds the second time threshold value or not; if yes, controlling the electric heating belt to be started; if not, waiting for the second operation duration to exceed the second time threshold; and the second operation time length is the time length from the closing time of the electric heating belt to the current time.
In this embodiment, once the electric heating belt is turned on or off, a certain time delay is required to perform the turning-off or turning-on operation. For example, referring to fig. 4, the first time threshold is preferably 120s, after the electric heating belt is turned on, when DSH >15 is detected, the electric heating belt is controlled to be turned off if the first operation duration has reached 120s, and the electric heating belt is controlled to be turned off when the first operation duration has not reached 120 s. And the second time threshold is preferably 120s, and after the electric heating belt is closed, if the DSH is detected to be less than or equal to 10, the electric heating belt can be controlled to be opened when the second operation time reaches 120 s. Therefore, the frequent start and stop of the electric heating belt can be effectively prevented, and the service life of the air conditioner is prolonged.
In a specific embodiment, the control portion is configured to further include:
the calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature and controlling the rotating speed of the outdoor fan according to the temperature difference comprises the following steps:
judging whether the temperature difference reaches a preset target temperature difference interval or not;
and when the temperature difference reaches the target temperature difference interval, controlling the outdoor fan to keep the current rotating speed to operate.
In this embodiment, the outdoor coil temperature and the outdoor environment temperature are monitored in real time, and the temperature difference Δ T between the outdoor coil temperature and the outdoor environment temperature is calculated. For example, referring to fig. 5, it is a schematic control flow diagram of the outdoor fan according to the embodiment of the present invention, where the target temperature difference interval is controlled between 15 and 20, and when Δ T is greater than or equal to 15 and less than or equal to 20, the gear of the outdoor fan is maintained, so as to effectively improve the high-low pressure of the air conditioner system and ensure the reliability of the air conditioner operation.
In another specific embodiment, the control section is configured to further include:
calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference, and the method further comprises the following steps:
when the temperature difference is larger than the upper limit value of the target temperature difference interval, controlling the outdoor fan to operate at an (i + 1) th gear; the ith gear is the current gear of the outdoor fan, and the rotating speed corresponding to the ith gear of the outdoor fan is less than the rotating speed corresponding to the (i + 1) th gear of the outdoor fan;
judging whether the current temperature difference reaches the target temperature difference interval or not every preset time, and judging whether the current gear of the outdoor fan reaches a preset highest gear or not;
when the current temperature difference is judged to reach the target temperature difference interval or the current gear of the outdoor fan reaches the highest gear, controlling the outdoor fan to keep the current gear to operate;
and when the current temperature difference is judged not to reach the target temperature difference interval and the current gear of the outdoor fan does not reach the highest gear, controlling the outdoor fan to operate at the (i + 1) th gear.
In this embodiment, if the current temperature difference is greater than the upper limit value of the target temperature difference interval, the gear of the outdoor fan is increased, and the gear of the outdoor fan is adjusted for a preset time period until the current temperature difference reaches the target temperature difference interval or the outdoor fan reaches the highest gear. Illustratively, the gears of the outdoor fan are divided into 16 gears, which are sequentially as follows according to the rotating speed: w1-200, W2-260, W3-300, W4-340, W5-400, W6-480, W7-540, W8-580, W9-620, W10-650, W11-680, W12-710, W13-750, W15-800 and W16-850. Wherein, the gear under the low temperature refrigeration control mode is limited to the gear W1-W6. Referring to fig. 5, when the temperature difference is not within the target temperature difference interval, if Δ T >20, the outdoor fan is operated in one gear higher. And the preset time length can be preset to 60s, the gear of the outdoor fan is adjusted once every 60s, until the gear of the outdoor fan reaches W6 gear, or the current temperature difference reaches the target temperature difference interval, the outdoor fan keeps the current gear running.
In another specific embodiment, the control section is configured to further include:
calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference, and the method further comprises the following steps:
when the temperature difference is smaller than the lower limit value of the target temperature difference interval, controlling the outdoor fan to operate at an i-1 th gear; the ith gear is the current gear of the outdoor fan, and the rotating speed corresponding to the ith gear of the outdoor fan is greater than the rotating speed corresponding to the (i-1) th gear of the outdoor fan;
judging whether the current temperature difference reaches the target temperature difference interval or not every preset time, and judging whether the current gear of the outdoor fan reaches a preset lowest gear or not;
when the current temperature difference is judged to reach the target temperature difference interval or the current gear of the outdoor fan reaches the lowest gear, controlling the outdoor fan to keep the current gear to operate;
and when the current temperature difference is judged not to reach the target temperature difference interval and the current gear of the outdoor fan does not reach the lowest gear, controlling the outdoor fan to operate at the (i-1) th gear.
In this embodiment, if the current temperature difference is smaller than the lower limit value of the target temperature difference interval, the gear of the outdoor fan is reduced, and the gear of the outdoor fan is adjusted for a preset time period until the current temperature difference reaches the target temperature difference interval or the outdoor fan reaches the lowest gear. For example, referring to fig. 5, when the temperature difference is not within the target temperature difference interval, if Δ T <15, the outdoor fan is operated by one gear step down. And the preset time length can be preset to 60s, the gear of the outdoor fan is adjusted once every 60s, until the gear of the outdoor fan reaches W1 gear, or the current temperature difference reaches the target temperature difference interval, the outdoor fan keeps the current gear running.
In some embodiments, referring to fig. 1, an air conditioner provided in an embodiment of the present invention includes an indoor unit, where the indoor unit includes a throttling element 4. The throttling element 4 is used to reduce the pressure of the liquid refrigerant, and in the present embodiment, the throttling element 4 is preferably an electronic expansion valve. The control section 3 is configured to further include:
acquiring the temperature of an indoor coil and the temperature of indoor environment;
taking the minimum value of the indoor coil temperature as the minimum indoor coil temperature;
judging whether the temperature of the indoor coil pipe meets all preset triggering conditions or not; the trigger condition is determined by the following formula, and the specific formula is as follows:
Tinner disc>Tmin inner plate+a (1)
TInner disc>TInner ring+b (2)
t≥t1(3)
Wherein, TInner discIs the indoor coil temperature, Tmin inner plateIs the minimum indoor coil temperature, TInner ringFor the indoor environment temperature, a is a first judgment coefficient, b is a second judgment coefficient, t is the time length from the moment satisfying the formula (1) and the formula (2) to the current moment, and t is the time length from the moment satisfying the formula (1) and the formula (2) at the same time1A preset duration threshold;
when the temperature of the indoor coil pipe is judged to meet the trigger condition, the opening degree of the expansion valve is increased according to the suction superheat degree until the temperature of the indoor coil pipe meets the preset valve opening stopping condition; wherein the suction superheat is determined by the difference between the indoor coil temperature and the minimum indoor coil temperature; the valve opening stopping condition is determined by the following formula, and the specific formula is as follows:
Tinner disc≤Tmin inner plate-c (4)
Wherein c is a third judgment coefficient.
In this embodiment, the indoor unit may detect the indoor ambient temperature by providing an indoor temperature sensor; and detecting the temperature of the indoor coil by arranging an indoor coil temperature sensor. An indoor control device of the indoor unit controls the throttling element and the like, and is connected with the indoor temperature sensor and the indoor coil temperature sensor to receive signals related to the temperatures measured by the indoor temperature sensor and the indoor coil temperature sensor.
Specifically, referring to fig. 7, a control flow diagram of the electronic expansion valve according to the embodiment of the present invention is shown, and under a condition that the electronic expansion valve is normally controlled, the indoor ambient temperature and the indoor coil temperature are monitored in real time. Preferably, the first determination parameter and the second determination parameter are both preset to be 5, the second determination parameter is preset to be 2, and the duration threshold is preset to be 120 s. When the indoor coil temperature T of the indoor unitInner disc>Tmin inner plate+5，TInner disc>TInner ring+5, and continuing 120s, determining the indoor machine refrigerant has deflected, at this moment, it is necessary to increase the opening of the indoor machine electronic expansion valve, and controlling the electronic expansion valve to open the valve with the increased opening. Wherein, the degree of superheat SSH ═ T according to the intake airInner disc-Tmin inner plateThe specific number of incremental steps of the electronic expansion valve is determined. When T is detectedInner disc≤Tmin inner plateAnd when-2, the valve is stopped. Therefore, the throttling element is controlled in the low-temperature refrigeration control mode, so that the problems of fluctuation of the refrigeration capacity and high outlet air temperature of the air conditioner are solved, the refrigeration capacity of the air conditioner is greatly stabilized, the refrigeration effect is improved, and the use comfort of a user is improved.
In some embodiments, the minimum opening of the throttling element is 80 steps.
In the embodiment, the minimum opening of the throttling element of the indoor unit is limited to 80 steps, so that the fluctuation of the refrigerating capacity of the system can be effectively avoided, and the use comfort of a user is improved.
In some embodiments, the control portion is configured to further include:
after the air conditioner enters the low-temperature refrigeration control mode, the method further comprises the following steps:
judging whether at least one preset exit condition of the low-temperature refrigeration control mode is met or not according to the outdoor coil temperature and the outdoor environment temperature; the low-temperature refrigeration control mode exit condition comprises that the current air conditioner is shut down or is in an uncooled dehumidification mode, and the outdoor environment temperature is greater than a preset third temperature threshold value or the outdoor coil temperature is greater than a preset fourth temperature threshold value within a second preset time length;
when at least one exit condition of the low-temperature refrigeration control mode is met, judging that the air conditioner exits the low-temperature refrigeration control mode;
and when the condition for quitting the low-temperature refrigeration control mode is not met, judging that the air conditioner is kept in the low-temperature refrigeration control mode.
Specifically, after the air conditioner enters the low-temperature refrigeration control mode, when it is detected that the outdoor coil temperature and the outdoor environment temperature meet the condition that the air conditioner is in a shutdown state or in an uncooled dehumidification mode currently, or the outdoor environment temperature is greater than a preset third temperature threshold value or the outdoor coil temperature is greater than a preset fourth temperature threshold value within a second preset time period, the air conditioner is considered to exit the low-temperature refrigeration control mode. Therefore, the operation is quitted after the high-low pressure of the system is increased to the preset stable state under the condition of ensuring the low-temperature refrigeration control mode, and the running reliability of the air conditioner can be ensured. For example, referring to fig. 3, in the low temperature refrigeration control mode, it is determined whether T is satisfiedOuter ring>20 ℃ or TOuter ring>If the temperature is 35 ℃, the low-temperature refrigeration control mode is exited; if not, the low-temperature refrigeration control mode is kept. Judging whether the current air conditioner is in a shutdown or non-refrigeration dehumidification mode, if so, exiting from the low-temperature refrigeration control mode; if not, the low-temperature refrigeration control mode is kept.
The air conditioner provided by the embodiment of the invention has the following beneficial effects:
the high-low pressure of the air conditioner system can be effectively improved by controlling the working state of the electric heating belt of the compressor and the rotating speed of the outdoor fan in the low-temperature refrigeration control mode, so that the problems of difficult liquid impact and oil return of the compressor and the like caused by the operation of the low-temperature refrigeration mode can be effectively solved, the operation reliability of the compressor is ensured, the operation stability of the air conditioner is improved, meanwhile, no additional control component is required to be added, the operation can be realized only by optimizing the configuration of the control part, and the air conditioner has the characteristics of low cost and easiness in operation.
The problems of fluctuation of the refrigeration capacity and high outlet air temperature of the air conditioner are solved by controlling the throttling element in the low-temperature refrigeration control mode. Therefore, the refrigerating capacity of the air conditioner is greatly stabilized, the refrigerating effect is improved, and the use comfort of a user is improved.
By ensuring that the running states of the electric heating belt and the outdoor fan are controlled under the condition of being in the low-temperature refrigeration control mode, the condition of faults caused by misoperation can be effectively avoided, and the running reliability of the air conditioner is ensured.
By controlling the working state of the electric heating belt, the possibility of liquid impact of the compressor can be effectively reduced, and the running reliability of the compressor is ensured.
The electric heating belt can be closed or opened only after a certain time delay once being opened or closed, so that the frequent starting and stopping of the electric heating belt can be effectively prevented, and the service life of the air conditioner is prolonged.
By judging whether the current temperature difference reaches the target temperature difference range or not, the high-low pressure of the air conditioner system is effectively improved, and the operation reliability of the air conditioner unit is ensured.
The minimum opening of the throttling element of the indoor unit is limited to 80 steps, so that the fluctuation of the refrigerating capacity of the system can be effectively avoided, and the use comfort of a user is improved.
The operation is quitted after the high-low pressure of the system is increased to the preset stable state under the condition of ensuring the low-temperature refrigeration control mode, so that the running reliability of the air conditioner can be ensured.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. An air conditioner, comprising:
an outdoor unit including:
the electric heating belt is used for heating the lubricating oil of the compressor so as to evaporate liquid refrigerant in the lubricating oil;
an outdoor fan for supplying outdoor air to the outdoor heat exchanger; and the number of the first and second groups,
the control section is configured to include:
acquiring the exhaust temperature of a compressor, the temperature of an outdoor coil and the outdoor environment temperature;
when the air conditioner is detected to enter a low-temperature refrigeration control mode, determining the exhaust superheat degree according to the exhaust temperature and the outdoor coil temperature;
controlling the working state of the electric heating belt according to the exhaust superheat degree;
and calculating the temperature difference between the temperature of the outdoor coil and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference.
2. The air conditioner according to claim 1, further comprising:
an indoor unit, the indoor unit comprising:
a throttling element for performing decompression of the liquid refrigerant; and the number of the first and second groups,
the control section is configured to further include:
acquiring the temperature of an indoor coil and the temperature of indoor environment;
taking the minimum value of the indoor coil temperature as the minimum indoor coil temperature;
judging whether the temperature of the indoor coil pipe meets all preset triggering conditions or not; the trigger condition is determined by the following formula, and the specific formula is as follows:
Tinner disc＞Tmin inner plate+a (1)
TInner disc＞TInner ring+b (2)
t≥t1(3)
Wherein, TInner discIs the indoor coil temperature, Tmin inner plateIs the minimum indoor coil temperature, TInner ringFor the indoor environment temperature, a is a first judgment coefficient, b is a second judgment coefficient, t is the time length from the moment satisfying the formula (1) and the formula (2) to the current moment, and t is the time length from the moment satisfying the formula (1) and the formula (2) at the same time1A preset duration threshold;
when the temperature of the indoor coil pipe is judged to meet the trigger condition, the opening degree of the throttling element is increased according to the suction superheat degree until the temperature of the indoor coil pipe meets the preset valve opening stopping condition; wherein the suction superheat is determined by the difference between the indoor coil temperature and the minimum indoor coil temperature; the valve opening stopping condition is determined by the following formula, and the specific formula is as follows:
Tinner disc≤Tmin inner plate-c (4)
Wherein c is a third judgment coefficient.
3. The air conditioner according to claim 1, wherein the control section is configured to further include:
judging whether all preset low-temperature refrigeration control mode entry conditions are met or not according to the outdoor coil temperature and the outdoor environment temperature; the low-temperature refrigeration control mode entering condition comprises that the air conditioner is in a refrigeration or dehumidification mode currently, and the outdoor environment temperature is smaller than a preset first temperature threshold value and the outdoor coil temperature is smaller than a preset second temperature threshold value within a first preset time length;
and when all the low-temperature refrigeration control mode entry conditions are met, judging that the air conditioner enters a low-temperature refrigeration control mode.
4. The air conditioner according to claim 1, wherein the control section is configured to further include:
when the air conditioner is detected to enter the low-temperature refrigeration control mode, determining the exhaust superheat degree according to the exhaust temperature and the outdoor coil temperature, and specifically comprising the following steps of:
when the air conditioner is detected to enter a low-temperature refrigeration control mode, calculating the difference value between the exhaust temperature and the temperature of the outdoor coil, and determining the exhaust superheat degree according to the difference value;
the controlling the working state of the electric heating belt according to the exhaust superheat degree specifically comprises:
when the exhaust superheat degree is not larger than a preset first exhaust superheat degree threshold value, controlling the electric heating belt to be started until the exhaust superheat degree is larger than a preset second exhaust superheat degree threshold value; wherein the second exhaust superheat threshold is greater than the first exhaust superheat threshold;
and when the exhaust superheat degree is larger than the first exhaust superheat degree threshold value, controlling the electric heating belt to keep a closed working state.
5. The air conditioner according to claim 4, wherein the control section is configured to further include:
when the electric heating belt is in an open working state and the exhaust superheat degree is greater than the second exhaust superheat degree threshold value, judging whether the current first operation time length exceeds a preset first time threshold value; if yes, controlling the electric heating belt to be closed; if not, waiting for the first operation duration to exceed the first time threshold; the first operation duration is the duration from the starting time of the electric heating belt to the current time;
when the electric heating belt is in a closed working state and the exhaust superheat degree is not larger than the first exhaust superheat degree threshold value, judging whether the current second operation time length exceeds the second time threshold value or not; if yes, controlling the electric heating belt to be started; if not, waiting for the second operation duration to exceed the second time threshold; and the second operation time length is the time length from the closing time of the electric heating belt to the current time.
6. The air conditioner according to claim 1, wherein the control section is configured to further include:
the calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature and controlling the rotating speed of the outdoor fan according to the temperature difference comprises the following steps:
judging whether the temperature difference reaches a preset target temperature difference interval or not;
and when the temperature difference reaches the target temperature difference interval, controlling the outdoor fan to keep the current rotating speed to operate.
7. The air conditioner according to claim 6, wherein the control section is configured to further include:
calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference, and the method further comprises the following steps:
when the temperature difference is larger than the upper limit value of the target temperature difference interval, controlling the outdoor fan to operate at an (i + 1) th gear; the ith gear is the current gear of the outdoor fan, and the rotating speed corresponding to the ith gear of the outdoor fan is less than the rotating speed corresponding to the (i + 1) th gear of the outdoor fan;
judging whether the current temperature difference reaches the target temperature difference interval or not every preset time, and judging whether the current gear of the outdoor fan reaches a preset highest gear or not;
when the current temperature difference is judged to reach the target temperature difference interval or the current gear of the outdoor fan reaches the highest gear, controlling the outdoor fan to keep the current gear to operate;
and when the current temperature difference is judged not to reach the target temperature difference interval and the current gear of the outdoor fan does not reach the highest gear, controlling the outdoor fan to operate at the (i + 1) th gear.
8. The air conditioner according to claim 6, wherein the control section is configured to further include:
calculating the temperature difference between the outdoor coil temperature and the outdoor environment temperature, and controlling the rotating speed of the outdoor fan according to the temperature difference, and the method further comprises the following steps:
when the temperature difference is smaller than the lower limit value of the target temperature difference interval, controlling the outdoor fan to operate at an i-1 th gear; the ith gear is the current gear of the outdoor fan, and the rotating speed corresponding to the ith gear of the outdoor fan is greater than the rotating speed corresponding to the (i-1) th gear of the outdoor fan;
judging whether the current temperature difference reaches the target temperature difference interval or not every preset time, and judging whether the current gear of the outdoor fan reaches a preset lowest gear or not;
when the current temperature difference is judged to reach the target temperature difference interval or the current gear of the outdoor fan reaches the lowest gear, controlling the outdoor fan to keep the current gear to operate;
and when the current temperature difference is judged not to reach the target temperature difference interval and the current gear of the outdoor fan does not reach the lowest gear, controlling the outdoor fan to operate at the (i-1) th gear.
9. The air conditioner according to claim 2, wherein the minimum opening degree of the throttling element is 80 steps.
10. The air conditioner according to claim 1, wherein the control section is configured to further include:
after the air conditioner enters the low-temperature refrigeration control mode, the method further comprises the following steps:
judging whether at least one preset exit condition of the low-temperature refrigeration control mode is met or not according to the outdoor coil temperature and the outdoor environment temperature; the low-temperature refrigeration control mode exit condition comprises that the current air conditioner is shut down or is in an uncooled dehumidification mode, and the outdoor environment temperature is greater than a preset third temperature threshold value or the outdoor coil temperature is greater than a preset fourth temperature threshold value within a second preset time length;
when at least one exit condition of the low-temperature refrigeration control mode is met, judging that the air conditioner exits the low-temperature refrigeration control mode;
and when the condition for quitting the low-temperature refrigeration control mode is not met, judging that the air conditioner is kept in the low-temperature refrigeration control mode.
CN202010682237.8A 2020-07-15 2020-07-15 Air conditioner Pending CN111780382A (en)

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