WO2018214609A1 - Climatiseur et procédé de commande de dégivrage associé - Google Patents

Climatiseur et procédé de commande de dégivrage associé Download PDF

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Publication number
WO2018214609A1
WO2018214609A1 PCT/CN2018/077792 CN2018077792W WO2018214609A1 WO 2018214609 A1 WO2018214609 A1 WO 2018214609A1 CN 2018077792 W CN2018077792 W CN 2018077792W WO 2018214609 A1 WO2018214609 A1 WO 2018214609A1
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Prior art keywords
air conditioner
defrosting
condition
mode
compressor
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PCT/CN2018/077792
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English (en)
Chinese (zh)
Inventor
许文明
王飞
付裕
张明杰
常利华
王伟锋
冯景学
陈健琪
杨万鹏
Original Assignee
青岛海尔空调器有限总公司
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Application filed by 青岛海尔空调器有限总公司 filed Critical 青岛海尔空调器有限总公司
Publication of WO2018214609A1 publication Critical patent/WO2018214609A1/fr

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle

Definitions

  • the invention relates to the field of air conditioners, and in particular to an air conditioner and a defrosting control method thereof.
  • An air conditioner (such as a household air conditioner) is a device capable of adjusting the temperature of an indoor environment.
  • the working principle is that the indoor ambient temperature is changed by a state of high pressure/low pressure/gaseous/liquid state between the circulating pipes through the refrigerant. Decrease or increase, that is, from the perspective of the air conditioner indoor unit, the air conditioner is placed in a cooling or heating cycle.
  • the air conditioner outdoor unit functions as an evaporator (the low-pressure liquid refrigerant is heated to evaporate in the evaporator and becomes a low-pressure gas state) and the air-conditioning indoor unit functions as a condenser.
  • the coil of the outdoor unit of the air conditioner starts to frost.
  • the frost on the outer wall of the outdoor unit coil reaches a certain thickness, the heating capacity of the air conditioner will be higher. The lower the level, the worse. Therefore, in order to ensure the heating effect of the air conditioner, the air conditioner outdoor unit must be defrosted.
  • reverse cycle defrosting is generally used in the prior art (the four-way valve is reversed, and the air conditioner indoor unit is used as an evaporator during the defrosting, and the air conditioner outdoor unit is used as a condenser, even if the air conditioner Running defrosting in the refrigeration cycle) or bypass defrosting (extracting a separate bypass branch from the high pressure side of the compressor to the air conditioner outdoor unit, even if the air conditioner is still operating in the heating cycle without stopping defrosting)
  • the method is to defrost the air conditioner outdoor unit.
  • the reverse cycle defrosting method has a high defrosting efficiency.
  • the defrosting method is used to defrosting the outdoor unit of the air conditioner, only a part of the refrigerant needs to be bypassed to the outdoor unit of the air conditioner, that is, the air conditioner is still maintained in the heating condition, so the indoor temperature in the room is not obvious. The ground is lowered, that is to say, the user experience can be better ensured during the defrosting process.
  • the defrosting efficiency of the bypass defrosting method is relatively low, that is, a longer defrosting time is required, and the longer-term bypass defrosting deteriorates the efficiency of the entire heating cycle, so it is only suitable for frosting. Defrost the outdoor unit of the air conditioner in severe cases.
  • the invention patent disclosed in the publication discloses an air conditioner defrosting control method and apparatus, which adopts a first defrosting mode (bypass defrosting) and a second defrosting mode (reverse cycle) Defrost) phase switching defrosting method.
  • the defrosting control method determines whether to perform defrosting and switching of the defrosting mode by combining two parameters of the running time and the temperature of the outdoor heat exchanger.
  • the bypass check valve is opened to control the air conditioner to enter the first defrost mode for defrosting;
  • the control air conditioner switches to the cooling mode operation to enter the second defrost mode for defrosting.
  • the preset temperature is set according to the outdoor ambient temperature, and the specific value is proportional to the outdoor ambient temperature.
  • the above conventional defrosting switching scheme has the following drawbacks: the use of bypass defrosting in the case where the frosting is severe due to external environment reasons or due to internal conditions such as excessive air conditioning running time and unclean defrosting last time. The way is difficult to get rid of frost in a short time. Moreover, since the bypass defrosting is actually a cycle lacking the evaporator, the long-term operation will inevitably result in a very low intake temperature and exhaust temperature, and thus the heat generated by the air conditioner cannot guarantee the defrosting and heating efficiency. Therefore, reverse cycle defrost is required when certain conditions are met.
  • the present invention provides an air conditioner in addition to The frost control method is designed to optimize the defrosting control mechanism of the air conditioner.
  • the defrosting control method of the air conditioner includes the following steps: obtaining a heating operation duration of the air conditioner in a heating condition after the last defrosting is completed; acquiring a defrosting operation duration of the last defrosting of the air conditioner; acquiring a frequency of the compressor of the air conditioner after completion of one defrosting; and in a case where the judgment condition 1, the judgment condition 2, and the judgment condition 3 are satisfied, the air conditioner is caused to enter a first defrosting mode; wherein the judgment Condition 1 is that the heating operation duration is greater than a first preset duration, the determination condition 2 is that the defrost operation duration is less than a second preset duration, and the determination condition 3 is that the compressor frequency meets a preset condition.
  • the air conditioner in a case where only one or two of the determination condition 1, the determination condition 2, and the determination condition 3 are satisfied, the air conditioner is caused to enter Second defrost mode.
  • the method includes the steps of: recording the number and conditions of entering the air conditioner into the second defrosting mode; determining whether to make based on the number and conditions of entering the second defrosting mode The air conditioner enters a first defrost mode.
  • the step of determining whether to cause the air conditioner to enter the first defrosting mode based on the number of times of entering the second defrosting mode and the condition includes: When the condition that the air conditioner enters the second defrosting mode is "the determination condition 1, the determination condition 2, and two of the determination conditions 3 are satisfied", the air conditioner is caused to enter The first defrost mode.
  • the “the frequency of the compressor satisfies the preset condition” is specifically: the working frequency of the compressor is not lower than the preset frequency for a longer period than the third preset time.
  • the “the frequency of the compressor satisfies the preset condition” is specifically: the average operating frequency of the compressor that is periodically collected is not lower than the preset frequency.
  • the first preset duration is a duration of not less than 50 min
  • the second preset duration is a duration of no more than 5 min.
  • the first defrosting mode is a reverse cycle defrosting mode
  • the second defrosting mode is a bypass defrosting mode
  • the present invention also provides an air conditioner including a compressor, an air conditioner outdoor unit, an air conditioner indoor unit, a throttle mechanism, and a four-way valve, wherein the compressor, the air conditioner outdoor unit, and the air conditioner indoor unit are in turn Connected to form a closed loop, the throttle mechanism is disposed between the air conditioner outdoor unit and the air conditioner indoor unit, and the four-way valve can be in a reversing manner to cause the air conditioner to be in a refrigeration cycle or a heating cycle.
  • the air conditioner further includes: a bypass branch disposed between the compressor and the air conditioner outdoor unit, and the bypass branch is provided with a bypass check valve; a control portion And used for: the heating operation duration of the air conditioner in the heating condition after the completion of the last defrosting obtained, the defrosting operation duration of the last defrosting of the air conditioner, and the air conditioning after the last defrosting is completed
  • the frequency of the compressor of the device determines the number of the determination condition 1, the determination condition 2, and the determination condition 3, wherein the determination condition 1 is that the heating operation duration is greater than the first preset duration; the determination condition 2 is Comment The operation duration is less than the second preset duration; the determination condition 3 is that the frequency of the compressor satisfies the preset condition; and in the case that the determination condition 1, the determination condition 2, and the determination condition 3 are satisfied,
  • the air conditioner enters a first defrost mode; in a case where only one or two of the judgment condition 1, the judgment condition 2, and the judgment condition 3 are satisfied, the air conditioner is brought into the second
  • the first defrost mode is a reverse cycle defrost mode
  • the second defrost mode is a bypass defrost mode
  • the defrosting timing and the defrosting mode of the air conditioner are determined according to the judgment conditions (1, 2, 3), and optimized.
  • the defrosting control mechanism of the air conditioner that is, the defrosting control method of the present invention, can determine a reasonable defrosting mode at an appropriate defrosting timing.
  • FIG. 1 is a schematic structural view of an air conditioner (a bypass branch is provided between a compressor and an outdoor unit of an air conditioner, and reverse cycle defrosting or bypass defrosting can be employed);
  • FIG. 2 is a schematic flow chart 1 of a method for controlling defrosting of an air conditioner according to the present invention
  • FIG. 3 is a second schematic diagram of the flow of the defrosting control method of the air conditioner of the present invention.
  • FIG. 1 is a schematic view of the structure of an air conditioner of the present invention.
  • the air conditioner mainly includes a compressor 1, an air conditioner indoor unit 2, an air conditioner outdoor unit 3, a four-way valve 4, a throttle mechanism (such as a throttle valve 5), and a bypass branch 6.
  • the compressor 1, the air conditioner indoor unit 2, and the air conditioner outdoor unit 3 are sequentially connected to form a closed loop.
  • the air conditioner can be placed in a cooling or heating cycle.
  • the reverse cycle defrosting of the air conditioner outdoor unit 3 can be realized in the case where the air conditioner is switched to the refrigeration cycle by switching the four-way valve 4.
  • the throttle valve 5 is provided between the air conditioning indoor unit 2 and the air conditioner outdoor unit 3, and is mainly used to adjust the flow rate of the refrigerant.
  • the bypass branch 6 is disposed between the exhaust port of the compressor 1 and the air inlet of the air conditioner outdoor unit 3, and the bypass branch 6 is provided with the bypass branch 6 in an on state and non-conducting.
  • the bypass check valve 61 that switches between the states can perform bypass defrosting of the air conditioner outdoor unit 3 when the bypass branch 6 is turned on.
  • the air conditioner is further provided with a control portion (not shown), and the present invention mainly describes the function of the control portion in defrosting, that is, the control portion is mainly used to enable the air conditioner to obtain reasonable timing at an appropriate defrosting timing.
  • Defrosting method the control unit can cause the air conditioner to enter the defrosting mode when the outdoor unit coil of the outdoor unit of the air conditioner needs defrosting according to a predetermined determination condition, and exit the defrosting mode after the defrosting ends.
  • the bypass check valve 61 of the bypass branch 6 is turned on to perform bypass defrosting according to a preset condition or combination of conditions, or the four-way valve 4 is reversed to perform reverse cycle defrosting.
  • the defrosting control method can determine an appropriate defrosting timing and a reasonable defrosting mode.
  • the proper defrosting timing can ensure that the outdoor unit coil of the air conditioner outdoor unit 3 can obtain a timely defrosting strategy in the case of frost formation, thereby avoiding the phenomenon that the heating efficiency is degraded or even deteriorated due to frosting of the outdoor unit coil. , that is to ensure the operational reliability of the air conditioner.
  • a reasonable defrosting method balances the defrosting reliability with the user experience, so that the performance of the air conditioner can be optimized to the greatest extent possible.
  • control unit is mainly configured to: according to the obtained heating operation time after the last defrosting is completed, the defrosting operation time of the air conditioner in the heating operation, and the defrosting operation time of the last defrosting of the air conditioner
  • the frequency of the compressor of the air conditioner after completion of the defrosting is determined, and the number of determination conditions 1, the determination condition 2, and the determination condition 3 are determined.
  • the air conditioner is caused.
  • the device enters the first defrost mode.
  • the judgment condition 1 is that the heating operation duration is greater than the first preset duration
  • the determination condition 2 is that the defrost operation duration is less than the second preset duration
  • determination condition 3 is that the compressor frequency satisfies the preset condition.
  • bypass defrosting and reverse cycle defrosting The physical meaning of the combination of bypass defrosting and reverse cycle defrosting is that during the heating cycle of the air conditioner, most of the exhaust (high pressure end) of the compressor is made in the case where the frosting is not serious or not very serious. It is directly sent to the inlet of the air conditioner indoor unit (condenser), and a small amount of exhaust gas enters the air conditioner outdoor unit 3 through the bypass branch 6, so that the frost of the outdoor unit coil can be timely eliminated in a short time. In the case of severe or severe frosting due to external factors such as environmental climate and weather, and the internal operation of the air conditioner heating cycle is too long and the last defrosting is not clean, the use of bypass defrosting is short. It is difficult or impossible to remove the existing frost in a timely and reliable manner.
  • bypass defrosting is essentially a heating cycle that lacks an evaporator, so long-term operation will result in a low suction and exhaust temperature of the compressor, and the heat generated will not be sufficient to continue defrosting or manufacturing.
  • Heat so when the set upper limit condition is reached, reverse cycle defrosting is performed, that is, the way of defrosting quickly in a short time in a manner that discards the user experience, in exchange for a benign heating cycle.
  • Fig. 2 is a flow chart 1 of the defrosting control method for an air conditioner of the present invention. As shown in FIG. 2, the method mainly includes the following steps:
  • step S300 According to the satisfaction condition of the judgment condition (1, 2, 3), the air conditioner is still in the current heating condition (non-bypass defrosting), or the defrosting is performed in a reasonable defrosting mode. Specifically, step S300 specifically includes:
  • the first defrost mode is a reverse cycle defrost mode
  • the second defrost mode is a bypass defrost mode
  • the present invention combines the three judgment conditions formed by the three parameters, and under the condition that all the three judgment conditions are satisfied, the conclusion that the frost formation is serious can be obtained, and thus the air conditioner is made by the reverse cycle defrosting method.
  • Quick defrost even if the air conditioner is switched to the refrigeration cycle to stop defrosting, in order to completely remove the accumulated frost.
  • the defrosting is performed by the bypass defrosting method, even if the air conditioner can perform the non-stop defrosting while still being able to perform the heating cycle.
  • the defrosting control strategy of the air conditioner is optimized by selecting a reasonable defrosting mode at the appropriate defrosting timing.
  • the air conditioner enters the bypass defrost mode.
  • the current working condition of the air conditioner satisfies the judgment condition (1, 2), (1, 3) or (2, 3)
  • the frost is still determined but not serious
  • the bypass check valve is opened to make the bypass branch guide Pass
  • the air conditioner enters the first defrost mode.
  • the air conditioner performs a reverse cycle defrosting.
  • the air conditioner is directly switched by switching the four-way valve. Entering the reverse cycle defrost mode, the accumulated frost is completely removed by means of shutdown defrosting to improve the heating performance of the air conditioner.
  • the first preset duration, the second preset duration, and the preset condition may be determined by any reasonable manner, such as historical usage data based on the air conditioner, simulation data, or repeated experiments and comparisons by the inventor. determine. As long as the determined defrosting timing and defrosting mode optimize the defrosting control strategy of the air conditioner.
  • the first preset duration is preferably a duration of not less than 50 minutes
  • the second preset duration is preferably a duration of no more than 5 minutes.
  • the first preset duration is 60 min
  • the second preset duration is 5 min.
  • Fig. 3 is a second schematic diagram of the defrosting control method of the air conditioner of the present invention.
  • the air conditioner defrosting control method of the present invention may further include a step S400, which is mainly a priority switching strategy determined by taking into account the user experience and heating efficiency of the air conditioner.
  • Step S400 further includes:
  • S402. Determine whether the defrosting mode entered by the air conditioners in the two consecutive cycles is the bypass defrosting mode; and S403, whether the condition that the air conditioner enters the bypass defrosting mode in the two consecutive cycles is satisfying the determining condition (1) Two of the 2, 3);
  • the defrosting mode entered by the air conditioner for two consecutive cycles is the bypass defrosting mode, and each time the air conditioner enters the bypass defrosting mode, the conditions satisfying the judgment condition (1, 2, 3) are satisfied. In both cases, it is determined that the defrosting is relatively serious.
  • the defrosting mode that causes the air conditioner to enter according to the foregoing steps S100-S300 is bypass defrosting or reverse cycle defrosting. The mode causes the air conditioner to perform a reverse cycle defrost.
  • step S403 determines whether to execute the priority switching policy in the order of performing step S403 after performing step S402.
  • step S402 and step S403 are reversed, or step S402 and step S403 are performed at the same time, it is also possible to determine whether to execute the priority switching policy, and therefore also belongs to the protection scope of the present invention.
  • the defrosting of the air conditioner can be ensured completely. Specifically, since the defrosting efficiency of the bypass defrosting is low, the operating condition of the air conditioner corresponding to the multiple bypass defrosting is in a state close to the severe frosting, and the heating efficiency is deteriorated. The heating cycle of the time can neither provide sufficient heat to the room nor enough heat to be distributed to the bypass circuit. Therefore, the frost should be thoroughly removed by reverse cycle defrosting to quickly improve the heating efficiency of the air conditioner. .
  • step S400 is specifically: if the condition that the air conditioner enters the second defrost mode twice in succession is that two of the conditions (1, 2, 3) are satisfied, Put the air conditioner into the first defrost mode.
  • the judgment condition 3 that is, the main mechanism of "the frequency of the compressor meets the preset condition" is: during the high frequency band (such as above 70hz), the evaporation temperature in the heating circuit of the air conditioner is low, and it is easy to frost. . Therefore, as long as the compressor can be avoided in the high frequency band for a long time.
  • the judgment condition 3 is that the working frequency of the compressor is not lower than the preset frequency for longer than the third preset time length.
  • the judgment condition 3 is that the average value of the operating frequencies of the compressors collected periodically (eg, every 15 s) is not lower than the preset frequency.
  • the third preset duration and the preset frequency may also be determined in any reasonable manner, such as based on historical usage data of the air conditioner, simulation data, or determined by inventors' repeated experiments and comparisons. As long as the determined defrosting timing and defrosting mode optimize the defrosting control strategy of the air conditioner.
  • the preset frequency is preferably a frequency of not less than 70 hz.
  • the first preset duration is 60 min and the second preset duration is 5 min, and the preset frequency is 70 Hz.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un climatiseur et un procédé de commande de dégivrage associé. Le procédé de commande de dégivrage consiste à : acquérir une durée d'une opération de dégivrage précédente et une durée d'une opération de chauffage d'un climatiseur et une fréquence d'un compresseur après la réalisation de l'opération de dégivrage (S100) ; et lorsqu'un critère de détermination 1, un critère de détermination 2 et un critère de détermination 3 sont tous satisfaits, amener le climatiseur à entrer dans un premier mode de dégivrage (S301). Le procédé de commande de dégivrage optimise un mécanisme de commande de dégivrage d'un climatiseur.
PCT/CN2018/077792 2017-05-23 2018-03-01 Climatiseur et procédé de commande de dégivrage associé WO2018214609A1 (fr)

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CN201710367681.9 2017-05-23
CN201710367681.9A CN107289578B (zh) 2017-05-23 2017-05-23 空调器及其除霜控制方法

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CN108692422B (zh) * 2018-05-21 2020-06-05 广东美的暖通设备有限公司 空调器除霜时长调整方法、装置、空调器及可读存储介质
CN108592297B (zh) * 2018-06-01 2021-04-20 青岛海尔空调器有限总公司 空调器除霜控制方法
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CN113614463B (zh) * 2019-03-25 2022-11-08 三菱电机株式会社 空调装置
CN110243061B (zh) * 2019-06-20 2021-09-24 广东美的暖通设备有限公司 控制方法、空调器以及计算机可读存储介质
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CN110553347B (zh) * 2019-09-17 2022-01-04 宁波奥克斯电气股份有限公司 一种延缓结霜的控制方法、系统、存储介质及空调器
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CN111503815A (zh) * 2020-04-29 2020-08-07 广东美的制冷设备有限公司 空调系统的化霜控制方法和空调系统
CN111503826B (zh) * 2020-04-29 2022-05-10 广东美的制冷设备有限公司 空调系统的化霜控制方法和空调系统
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