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WO2022222940A1 - Unité de climatisation et procédé de commande de dégivrage associé - Google Patents

Unité de climatisation et procédé de commande de dégivrage associé Download PDF

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Publication number
WO2022222940A1
WO2022222940A1 PCT/CN2022/087808 CN2022087808W WO2022222940A1 WO 2022222940 A1 WO2022222940 A1 WO 2022222940A1 CN 2022087808 W CN2022087808 W CN 2022087808W WO 2022222940 A1 WO2022222940 A1 WO 2022222940A1
Authority
WO
WIPO (PCT)
Prior art keywords
outdoor
temperature
air
preset
conditioning unit
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2022/087808
Other languages
English (en)
Chinese (zh)
Inventor
宋年欢
李旭
冯维庆
夏鹏
刘晓凯
刘汇泉
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.)
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home 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.)
Filing date
Publication date
Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd, Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Publication of WO2022222940A1 publication Critical patent/WO2022222940A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F24F11/42—Defrosting; Preventing freezing of outdoor 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
    • F24F11/80—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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the invention belongs to the technical field of air conditioners, and in particular relates to an air conditioner unit and a defrosting control method thereof.
  • the air conditioning unit includes an indoor unit, an outdoor unit, and a refrigerant circulation loop connected between the indoor unit and the outdoor unit.
  • the refrigerant continuously exchanges heat between the outdoor unit and the indoor unit through the refrigerant circulation loop.
  • the heating condition of the air conditioning unit since the coil of the outdoor unit is always in a low temperature state, and the outdoor temperature is also low; at this time, if the outdoor environment still has high humidity, the coil of the outdoor unit will The tube is prone to frost, and as the frost continues, the heat exchange efficiency of the outdoor unit will drop sharply, and the wind resistance will increase, which will lead to the continuous attenuation of the heating capacity of the entire air conditioning unit. Therefore, when the air-conditioning unit is operating under the heating condition, it is necessary to constantly monitor whether the coil of the outdoor unit has formed frost, and it is also necessary to select an appropriate time to enter the defrost mode to avoid unnecessary energy loss.
  • the existing air conditioning unit determines the defrosting timing, it does not differentiate the determination methods according to the different conditions of the outdoor ambient temperature, which easily leads to the problem of inaccurate determination results. Specifically, when the air-conditioning unit is heated in an ultra-low temperature environment, the outdoor ambient temperature and humidity are often very low, and the evaporating temperature is also very low, which makes it difficult to accurately judge the frost formation through the coil temperature. In other words, when the outdoor ambient temperature is very low and the humidity is low, the air-conditioning unit is prone to misjudgment, which causes the air-conditioning unit to enter unnecessary false defrosting, which in turn causes the heating performance of the air-conditioning unit to be frequently affected. It affects the heat exchange efficiency of the air conditioning unit and the comfort of the user.
  • the present invention provides a defrosting control method for the air-conditioning unit , the air-conditioning unit includes an outdoor unit, the outdoor unit includes an outdoor coil unit and an outdoor fan, and the defrosting control method includes: in the case where the current outdoor temperature is less than or equal to a preset outdoor temperature, obtaining the outdoor coil unit.
  • the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature and the duration reaches the first preset time length, further obtain the current of the outdoor fan; according to the obtained current of the outdoor fan, select The outlet air temperature of the outdoor unit is selectively acquired; and the air conditioning unit is selectively operated in a defrosting mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit.
  • the step of “selectively obtaining the outlet air temperature of the outdoor fan according to the obtained current of the outdoor fan” specifically includes: calculating the difference between the current of the outdoor fan and the The ratio of the preset current is recorded as the first ratio; if the first ratio is greater than the first preset ratio, the outlet air temperature of the outdoor unit is acquired.
  • the preset current is determined by: acquiring the current of the outdoor fan multiple times within a second preset time period after the last defrosting ends; The average value of the currents of a plurality of the outdoor fans is the preset current.
  • control method further includes: in the case that the first ratio is less than or equal to the first preset ratio, further acquiring the current heating operation of the air-conditioning unit Duration; if the duration of the current heating operation of the air-conditioning unit reaches the third preset duration, the air-conditioning unit is operated in the defrosting mode.
  • the step of "selectively enabling the air-conditioning unit to operate the defrosting mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit” specifically includes: calculating a preset The ratio of the difference to the difference between the current outdoor temperature and the outlet air temperature of the outdoor unit is denoted as a second ratio; compare the second ratio with a second preset ratio; according to the second ratio As a result of the comparison with the second preset ratio, the air conditioner unit is selectively operated in a defrost mode.
  • the step of "selectively enabling the air-conditioning unit to operate the defrosting mode according to the comparison result between the second ratio and the second preset ratio" specifically includes: if If the second ratio is greater than the second preset ratio, the air conditioner unit is operated in a defrosting mode.
  • the step of "selectively enabling the air-conditioning unit to operate the defrosting mode according to the comparison result between the second ratio and the second preset ratio" specifically includes: if If the second ratio is less than or equal to the second preset ratio, the duration of the current heating operation of the air-conditioning unit is further obtained; if the duration of the current heating operation of the air-conditioning unit reaches the fourth preset duration , the air-conditioning unit is operated in the defrost mode.
  • the preset difference value is determined by: obtaining the outlet air temperature of the outdoor unit and the Obtaining the outdoor temperature at least once; calculating the difference between the outdoor temperature and the obtained average value of the outlet air temperatures of the plurality of outdoor units, which is the preset difference.
  • the defrosting control method further includes: when the temperature of the outdoor coil is greater than the preset outdoor coil temperature, or the temperature of the outdoor coil is less than or equal to all If the duration of the preset outdoor coil temperature does not reach the first preset duration, further obtain the duration of the current heating operation of the air-conditioning unit; if the duration of the current heating operation of the air-conditioning unit continues When the duration reaches the sixth preset duration, the air conditioner unit is operated in the defrosting mode.
  • the present invention also provides an air conditioning unit, the air conditioning unit includes a controller, and the controller can execute the defrosting control method described in any one of the above-mentioned preferred technical solutions.
  • the air conditioning unit of the present invention includes an outdoor unit, the outdoor unit includes an outdoor coil unit and an outdoor fan, and the defrosting control method of the present invention includes: in the current outdoor In the case that the temperature is less than or equal to the preset outdoor temperature, the temperature of the outdoor coil is obtained; if the duration of the temperature of the outdoor coil that is less than or equal to the preset outdoor coil temperature reaches the first preset time length, the temperature of the outdoor coil is further obtained. according to the obtained current of the outdoor fan, selectively obtain the outlet air temperature of the outdoor unit; according to the current outdoor temperature and the outlet air temperature of the outdoor unit, selectively enable The air conditioning unit operates in a defrost mode.
  • the defrosting control method of the present invention is specially proposed for the situation that the outdoor temperature is low.
  • Using the defrosting control method of the present invention can accurately judge the frosting situation of the outdoor unit in the case of ultra-low temperature heating, so that the air conditioning unit The defrosting mode can be entered at the most appropriate time, thereby effectively ensuring the heating effect of the air-conditioning unit, so as to effectively improve the operating efficiency of the air-conditioning unit and the user's heat exchange experience.
  • the air-conditioning unit can obtain parameters by relying on the original electronic components, that is, the defrosting control method of the present invention can be performed without adding other electronic components, so as to effectively ensure that the structure of the air-conditioning unit does not need to be added. Any modification, and its manufacturing cost will not increase, it is very convenient to apply.
  • Fig. 1 is the main step flow chart of the defrosting control method of the present invention
  • FIG. 2 is a detailed step flow chart of a preferred embodiment of the defrosting control method of the present invention.
  • the air-conditioning unit described in the present invention can be either a one-for-one air-conditioning unit or a one-for-many multi-connected air-conditioning unit.
  • the change of the application object does not deviate from the basic principle of the present invention, and should belong to the present invention. the scope of protection of the invention.
  • the term "connected” should be understood in a broad sense, for example, it may be directly connected, or indirectly connected through an intermediate medium, or it may be an internal connection between two elements Connected.
  • the specific meanings of the above terms in the present invention can be understood according to specific situations.
  • the present invention provides a new defrosting control method.
  • the defrosting control method The temperature of the outdoor coil can be acquired when the current outdoor temperature is less than or equal to the preset outdoor temperature; if the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature and the duration reaches the first preset time length, Then further obtain the current of the outdoor fan; according to the obtained current of the outdoor fan, selectively obtain the outlet air temperature of the outdoor unit; according to the current outdoor temperature and the outlet air temperature of the outdoor unit, The air-conditioning unit is selectively operated in the defrosting mode, so that the air-conditioning unit can enter the defrosting mode at the most appropriate time, thereby effectively improving the operation efficiency of the air-conditioning unit.
  • the air conditioning unit of the present invention includes an indoor unit and an outdoor unit, the indoor unit is provided with an indoor coil, the outdoor unit is provided with an outdoor coil and an outdoor fan, and the indoor coil is connected to the outdoor unit.
  • the coils are connected through the refrigerant circulation loop to realize heat exchange, thereby realizing the effect of changing the room temperature; the outdoor fan is arranged near the outdoor coil, so as to effectively improve the heat exchange efficiency of the outdoor coil.
  • those skilled in the art can set the specific structure of the air conditioning unit according to actual use requirements, for example, the specific installation quantity of the indoor units, the specific type and installation location of the outdoor fan, and the like. This specific structural change of the air-conditioning unit does not deviate from the basic principle of the present invention, and should belong to the protection scope of the present invention.
  • the air conditioning unit further includes an outdoor temperature sensor, an outdoor coil temperature sensor and an outlet air temperature sensor, wherein the outdoor temperature sensor can detect the outdoor temperature where the outdoor unit is located, and the outdoor coil temperature sensor The temperature of the outdoor coil can be detected, and the outlet air temperature sensor can detect the outlet air temperature of the outdoor unit.
  • the air conditioning unit further includes a controller, which can acquire detection data of each sensor; specifically, the outdoor temperature where the outdoor unit is located is detected by the outdoor temperature sensor, and the outdoor coil is The temperature sensor detects the temperature of the outdoor coil, and the outlet air temperature of the outdoor unit is detected by the outlet air temperature sensor.
  • the controller can also control an operating mode of the air conditioning unit, eg, control the air conditioning unit to operate a defrost mode.
  • the present invention does not impose any restrictions on the specific operations performed by the air-conditioning unit after it enters the defrosting mode, and the technicians can set them according to the actual use requirements;
  • the outdoor coil can also be defrosted with the help of an electric heater; for example, different levels of defrosting modes can also be realized by combining multiple defrosting methods, which are not restrictive.
  • the controller may be the original controller of the air-conditioning unit, or it may be a controller for executing In the defrosting control method of the present invention, the controller is set separately, and the technical personnel can set the structure and model of the controller according to the actual use requirements.
  • FIG. 1 is a flow chart of the main steps of the defrosting control method of the present invention.
  • the defrosting control method of the present invention mainly includes the following steps:
  • step S1 if the current outdoor temperature is less than or equal to the preset outdoor temperature, it means that the air conditioning unit is running the heating mode in an ultra-low temperature environment.
  • the controller can The outdoor coil temperature sensor detects the temperature of the outdoor coil.
  • the preset outdoor temperature can be set according to local humidity conditions. . Further preferably, the preset outdoor temperature is set to -15°C.
  • the present invention does not impose any restrictions on the specific method of obtaining the temperature of the outdoor coil, and technicians can set it according to actual use requirements; preferably, the outdoor coil is provided with a plurality of The outdoor coil temperature sensor can obtain the temperature of multiple points on the outdoor coil through a plurality of the outdoor coil temperature sensors. Based on the obtained multiple coil temperatures, the controller can select the one with the lowest temperature. One is used as the temperature of the outdoor coil, so that the temperature of the place where frost is most likely to occur on the heat exchange coil is used as the temperature of the outdoor coil.
  • step S2 if the controller determines that the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature and the duration reaches the first preset time The controller further obtains the current of the outdoor fan; it should be noted that the present invention does not impose any restrictions on the specific manner in which the controller obtains the current of the outdoor fan, and technicians can set it according to actual use requirements.
  • the present invention does not impose any restrictions on the specific values of the preset outdoor coil temperature and the first preset duration, and technicians can set them according to actual use requirements;
  • the preset outdoor coil temperature is set to -20°C, and the first preset duration is set to 5min.
  • step S3 the controller can selectively acquire the outlet air temperature of the outdoor unit according to the acquired current of the outdoor fan; it should be noted that the present invention does not apply to this step.
  • the specific judgment conditions used in the test are subject to any restrictions, and the technicians can set them according to the actual use requirements. As long as it is judged that the outdoor unit has a risk of frost formation based on the obtained current of the outdoor fan, it will be further obtained.
  • the outlet air temperature of the outdoor unit is sufficient.
  • step S4 the controller can selectively enable the air conditioner unit to operate a defrosting mode according to the current outdoor temperature and the outlet air temperature of the outdoor unit.
  • the present invention does not impose any restrictions on the specific judgment conditions used in this step, and technicians can set them according to actual use requirements. For example, when the current outdoor temperature and the outlet air temperature of the outdoor unit exceed The air conditioner unit is controlled to operate the defrost mode only when a certain range is reached, or the air conditioner unit is controlled to operate the defrost mode only when the current outdoor temperature and the outlet air temperature of the outdoor unit satisfy a certain relationship.
  • a preferred embodiment of the defrosting control method of the present invention specifically includes the following steps:
  • S114 Calculate the ratio of the preset difference to the difference between the current outdoor temperature and the outlet air temperature of the outdoor unit, and record it as the second ratio;
  • step S101 when the air-conditioning unit operates in the heating mode, the controller can acquire the current outdoor temperature through the outdoor temperature sensor; it should be noted that this acquisition method is not limited, and the technical Personnel can also set their own acquisition methods according to actual use requirements; for example, they can also acquire the current outdoor temperature through the Internet.
  • step S102 the controller can determine whether the current outdoor temperature obtained in step S101 is less than or equal to the preset outdoor temperature, so as to determine whether the outdoor unit is operating in an ultra-low temperature environment.
  • the preset outdoor temperature can be set according to local humidity conditions. .
  • the preset outdoor temperature is set to -15°C.
  • step S103 is executed, that is, the controller can judge whether the air conditioner unit needs to operate the defrost mode through a conventional defrost judgment method . It should be noted that the present invention does not impose any restrictions on the judgment method involved in this step, and the technician can set it according to the actual use requirements; for example, directly judge the temperature of the outdoor coil, or directly judge the temperature of the air make judgments, etc.
  • step S104 is executed, that is, the controller can detect the temperature of the outdoor coil through the outdoor coil temperature sensor. temperature.
  • the outdoor coil is provided with a plurality of outdoor coils A temperature sensor, the temperature at multiple points on the outdoor coil can be obtained through a plurality of the outdoor coil temperature sensors, and based on the plurality of obtained coil temperatures, the controller can select the one with the lowest temperature as the temperature sensor.
  • the temperature of the outdoor coil is determined, so that the temperature of the place where frost is most likely to occur on the heat exchange coil is taken as the temperature of the outdoor coil.
  • step S105 the controller can determine whether the duration for which the temperature of the outdoor coil is less than or equal to the preset outdoor coil temperature reaches the first preset time period.
  • the present invention does not impose any restrictions on the specific values of the preset outdoor coil temperature and the first preset duration, and technicians can set them according to actual use requirements; preferably, the preset The temperature of the outdoor coil is set to -20°C, and the first preset time period is set to 5 minutes.
  • step S106 is executed, that is, the controller further obtains the duration of the current heating operation of the air-conditioning unit, so as to effectively avoid the occurrence of false defrost phenomena Describe the problem that the air-conditioning unit is not defrosted in time.
  • step S108 if the duration of the current heating operation of the air-conditioning unit reaches the sixth preset duration, the air-conditioning unit is enabled to operate the defrosting mode; otherwise, the defrosting mode is not operated.
  • the present invention does not impose any restrictions on the specific value of the sixth preset duration, which can be set by technicians according to actual usage requirements; preferably, the sixth preset duration is set to 3 hours.
  • step S108 is executed, that is, the controller further obtains The current of the outdoor fan; it should be noted that the present invention does not impose any restrictions on the specific manner in which the controller obtains the current of the outdoor fan, and technicians can set it according to actual use requirements.
  • the controller can calculate the ratio of the current of the outdoor fan to the preset current, which is recorded as a first ratio.
  • the controller can obtain the current of the outdoor fan multiple times, and calculate the average of the multiple currents.
  • value is the preset current; of course, the preset current may also be a set fixed value.
  • the second preset duration is set to 3 minutes, that is, within 3 minutes after the last defrosting of the air-conditioning unit, the controller can obtain the current of the outdoor fan multiple times, and calculate the time The average value of the currents is the preset current.
  • technicians can set the specific value of the second preset duration and the number of times of obtaining the current of the outdoor fan by themselves according to actual usage requirements, which is not limiting.
  • the current of the outdoor fan used in this step is also the average value of multiple values taken within the second preset time period before the current time, and the second preset time period is set to 3min.
  • the current of the outdoor fan is the average value of the current of the outdoor fan within 3 minutes before the current time.
  • the technician can set the number of acquisitions when calculating the average value according to actual use requirements.
  • step S110 the controller can determine whether the first ratio is greater than the first preset ratio, so as to perform different operations accordingly. It should be noted that the present invention does not impose any restrictions on the value of the first preset ratio; as a preferred setting value, the first preset ratio is set to 1.04, so as to maximize the accuracy of judgment sex.
  • step S111 is executed, that is, the controller further obtains the duration of the current heating operation of the air-conditioning unit, based on Therefore, in step S112, if the duration of the current heating operation of the air-conditioning unit reaches the third preset duration, the air-conditioning unit is operated in the defrosting mode; otherwise, the defrosting mode is not operated.
  • the present invention does not impose any restrictions on the specific value of the third preset duration, which can be set by technicians according to actual usage requirements; preferably, the third preset duration is smaller than the sixth preset duration. Set the duration.
  • step S113 is executed, that is, the controller further acquires the outlet air temperature of the outdoor unit.
  • step S114 the controller calculates the ratio of the preset difference to the difference between the current outdoor temperature and the outlet air temperature of the outdoor unit, which is recorded as a second ratio.
  • the controller can obtain the outlet air temperature of the outdoor unit multiple times and obtain the outdoor temperature at least once, And calculate the difference between the outdoor temperature and the average value of the outlet air temperatures of the plurality of outdoor units, which is the preset difference.
  • the outdoor temperature is acquired only once within the fifth preset time period after the last defrosting of the air-conditioning unit, calculate the difference between the outdoor temperature and the average value of the outlet air temperatures of the plurality of outdoor units; if If the outdoor temperature is obtained multiple times within the fifth preset time period after the last defrosting of the air-conditioning unit, the average value of the plurality of outdoor temperatures and the average value of the outlet air temperature of the plurality of outdoor units are calculated. difference value.
  • the fifth preset duration is set to 10 minutes, that is, within 10 minutes after the last defrosting of the air-conditioning unit, the controller can obtain the outlet air temperature of the outdoor unit for many times and at least obtain The outdoor temperature is calculated once, and the difference between the outdoor temperature and the average value of the outlet air temperatures of the plurality of outdoor units is calculated, which is the preset difference.
  • technicians can set the specific value of the fifth preset duration and the number of times of obtaining the outlet air temperature of the outdoor unit by themselves according to actual use requirements, which is not limiting.
  • the outlet air temperature of the outdoor unit used in this step is also the average value of multiple values taken within a preset time period before the current moment, preferably the average value within 3 minutes is used, that is, the The outlet air temperature of the outdoor unit is the average value of the outlet air temperature of the outdoor unit within 3 minutes before the current time.
  • technicians can set the number of acquisitions when calculating the average value by themselves according to actual use requirements.
  • step S115 the controller can determine whether the second ratio is greater than the second preset ratio, so as to perform different operations accordingly. It should be noted that the present invention does not impose any restrictions on the value of the second preset ratio; as a preferred setting value, the second preset ratio is set to 2, so as to maximize the accuracy of judgment sex.
  • step S116 is executed, that is, the controller further obtains the duration of the current heating operation of the air-conditioning unit, based on Therefore, in step S117, if the duration of the current heating operation of the air-conditioning unit reaches the fourth preset duration, the air-conditioning unit is enabled to operate the defrosting mode; otherwise, the defrosting mode is not operated.
  • the present invention does not impose any restrictions on the specific value of the fourth preset duration, which can be set by technicians according to actual usage requirements; preferably, the fourth preset duration is smaller than the third preset duration. Set the duration.
  • step S118 is executed, that is, the controller can enable the air-conditioning unit to operate the defrosting mode, so as to avoid false defrosting On the basis of the occurrence of the phenomenon, it can also effectively avoid the problem that the air-conditioning unit is not defrosted in time

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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

Afin de résoudre le problème de la difficulté de déterminer avec précision, au moyen d'un procédé de commande de dégivrage existant pour une unité de climatisation, la synchronisation optimale pour une unité de climatisation pour son entrée dans un mode de dégivrage, l'invention concerne un procédé de commande de dégivrage. Le procédé consiste : lorsque la température extérieure actuelle est inférieure ou égale à une température extérieure prédéfinie, à acquérir la température d'une bobine extérieure ; si la durée pendant laquelle la température de la bobine extérieure est inférieure ou égale à une température de bobine extérieure prédéfinie atteint une première durée prédéfinie, à acquérir en outre un courant électrique d'un ventilateur extérieur ; en fonction du courant électrique acquis du ventilateur extérieur, à acquérir sélectivement une température de sortie d'air d'une unité extérieure ; et en fonction de la température extérieure actuelle et de la température de sortie d'air de l'unité extérieure, à amener sélectivement une unité de climatisation à fonctionner dans un mode de dégivrage, de sorte que l'unité de climatisation peut entrer dans le mode de dégivrage selon la synchronisation optimale. Par conséquent, l'effet de chauffage d'une unité de climatisation est efficacement assuré.
PCT/CN2022/087808 2021-04-20 2022-04-20 Unité de climatisation et procédé de commande de dégivrage associé Ceased WO2022222940A1 (fr)

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