WO2020019849A1 - Climatiseur et son procédé de commande de dégivrage d'unité extérieure - Google Patents

Climatiseur et son procédé de commande de dégivrage d'unité extérieure Download PDF

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Publication number
WO2020019849A1
WO2020019849A1 PCT/CN2019/088231 CN2019088231W WO2020019849A1 WO 2020019849 A1 WO2020019849 A1 WO 2020019849A1 CN 2019088231 W CN2019088231 W CN 2019088231W WO 2020019849 A1 WO2020019849 A1 WO 2020019849A1
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WO
WIPO (PCT)
Prior art keywords
air conditioner
outdoor unit
suction pressure
control method
defrosting
Prior art date
Application number
PCT/CN2019/088231
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English (en)
Chinese (zh)
Inventor
周明杰
高强
张晓迪
张铭
王海胜
Original Assignee
青岛海尔空调电子有限公司
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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Application filed by 青岛海尔空调电子有限公司 filed Critical 青岛海尔空调电子有限公司
Publication of WO2020019849A1 publication Critical patent/WO2020019849A1/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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • 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

Definitions

  • the invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner and an outdoor unit defrost control method thereof.
  • an air conditioner includes an indoor unit, an outdoor unit, and a circulation circuit for connecting the indoor unit and the outdoor unit.
  • the heat exchange medium in the air conditioner continuously exchanges heat between the outdoor unit and the indoor unit through the circulation circuit, so as to change the room temperature. Effect. Take the heating operation of the air conditioner as an example, the coil of the outdoor unit is always in a low temperature state; at this time, if the outdoor environment has high humidity, the coil of the outdoor unit is prone to frost.
  • frost will seriously affect the heat exchange efficiency of the outdoor unit, which will continuously weaken the heat exchange effect of the air conditioner, and then affect the comfort of the indoor environment. Therefore, during heating operation of the air conditioner, the air conditioner needs to ensure that the coil of the outdoor unit does not generate frost.
  • the first method is to suspend heating operation of the air conditioner, and perform a reverse circulation operation on the heat exchange medium in the circulation circuit to achieve defrosting;
  • the second method is to add a defrosting hot gas bypass line to the air conditioner, so as to directly introduce the high-temperature heat exchange medium discharged from the compressor into the outdoor heat exchanger to realize defrosting.
  • the first defrost control method has a good defrost effect, it will affect the normal heating operation of the air conditioner; while the second defrost control method does not affect the normal heating operation of the air conditioner, But its defrosting effect is not very good.
  • Each of the existing air conditioners can only implement one of the defrosting control methods, so that the heating effect of the existing air conditioners is easily affected by the frosting phenomenon of the outdoor unit.
  • the present invention provides a defrost control method for an outdoor unit of an air conditioner.
  • the defrost control method includes: obtaining an air intake pressure of the air conditioner during a heating operation of the air conditioner. And the coil temperature of the outdoor unit; and according to the suction pressure of the air conditioner and the coil temperature of the outdoor unit, the air conditioner is selectively brought into a corresponding outdoor unit defrost mode.
  • the air conditioner is selectively caused to enter a corresponding air conditioner according to the suction pressure of the air conditioner and the coil temperature of the outdoor unit.
  • the step of "outdoor unit defrost mode" specifically includes: comparing the suction pressure with a preset suction pressure, and comparing the coil temperature with a first preset temperature and / or a second preset temperature; Selectively comparing the suction pressure with the preset suction pressure and the comparison result of the coil temperature with the first preset temperature and / or the second preset temperature
  • the air conditioner enters a corresponding outdoor unit defrost mode; wherein the first preset temperature is lower than the second preset temperature.
  • the defrost control method further includes: after the air conditioner enters the first defrost mode, The tube temperature is greater than or equal to a third preset temperature, so that the air conditioner exits the first defrost mode.
  • the step of "entering the air conditioner into a first defrost mode" specifically includes: during a heating operation of the air conditioner, The heat exchange medium output from the compressor of the air conditioner is directly introduced into the air inlet of the heat exchanger of the outdoor unit.
  • the defrost control method further includes: after the air conditioner enters the second defrost mode, if The tube temperature is greater than or equal to the fourth preset temperature, so that the air conditioner exits the second defrost mode.
  • the step of "making the air conditioner enter a second defrost mode" specifically includes: causing a circulation circuit of the air conditioner to perform a heat exchange medium inversion Cycle operation.
  • the present invention also provides an air conditioner.
  • the air conditioner includes a control device capable of performing the outdoor unit defrost control method described in any one of the foregoing preferred technical solutions.
  • the air conditioner further includes a defrost hot gas bypass line, and the defrost hot gas bypass line is used to introduce a heat exchange medium discharged from a compressor of the air conditioner into the air conditioner.
  • the heat exchanger of the outdoor unit is described.
  • the outdoor unit defrosting control method for an air conditioner of the present invention includes: when the air conditioner is in a heating operation, obtaining a suction of the air conditioner; Air pressure and the coil temperature of the outdoor unit in order to determine the degree of frosting of the outdoor unit; selectively enabling the air conditioner according to the air intake pressure of the air conditioner and the coil temperature of the outdoor unit Enter the corresponding defrost mode of the outdoor unit, so that the air conditioner can select the optimal defrost mode according to the degree of frosting of the outdoor unit, and the technical solution that the air conditioner can only perform a single defrost mode in the prior art
  • the present invention makes the defrost mode of the air conditioner more intelligent and flexible, thereby effectively avoiding the problem that the existing air conditioner is likely to seriously affect the heating effect because the selected defrost mode does not match the frost condition.
  • FIG. 1 is a schematic diagram of a system structure of an air conditioner according to the present invention.
  • FIG. 3 is a flowchart of specific steps of the defrosting control method of the present invention.
  • the present invention provides a defrost control method for an outdoor unit of an air conditioner.
  • the defrost control method includes: when the air conditioner is in a heating operation, obtaining an air intake pressure of the air conditioner. And the coil temperature of the outdoor unit; and according to the suction pressure of the air conditioner and the coil temperature of the outdoor unit, the air conditioner is selectively brought into a corresponding outdoor unit defrost mode.
  • FIG. 1 is a schematic structural diagram of an air conditioner according to the present invention.
  • the air conditioner includes a main circulation circuit and a Frost and hot gas bypass pipeline; wherein the main circulation circuit is provided with a compressor 1, a four-way valve 2, an indoor heat exchanger 3, an outdoor heat exchanger 4, and an electronic expansion valve 5, which are connected to each other, and the defrosting
  • the hot gas bypass line is used to introduce the heat exchange medium discharged from the compressor 1 into the outdoor heat exchanger 4, and a solenoid valve 6 is provided on the defrost hot gas bypass line to control the defrost hot gas bypass line
  • the solenoid valve 6 can also be replaced by other components having a switching function.
  • the air conditioner may be provided with a defrosting hot gas bypass line.
  • the air conditioner further includes a control device capable of performing the defrosting control method of the present invention; of course, the control device may be an original controller of the air conditioner or a technician for A controller and the like that are separately provided to run the control method.
  • a control device capable of performing the defrosting control method of the present invention
  • the control device may be an original controller of the air conditioner or a technician for A controller and the like that are separately provided to run the control method.
  • an intake pressure sensor is provided at the suction port of the compressor 1
  • a temperature sensor is provided at the coil of the outdoor unit.
  • the control device of the air conditioner can obtain the compressor 1 through the intake pressure sensor.
  • the coil temperature of the outdoor unit through the temperature sensor.
  • the present invention provides a defrost hot gas bypass. Piping, so that part of the high-temperature and high-pressure heat exchange medium discharged from the compressor 1 can be directly introduced into the outdoor heat exchanger 4 through the defrosting hot gas bypass pipeline, thereby increasing the temperature of the outdoor heat exchanger 4 and further effectively alleviating it Frost phenomenon.
  • this defrosting method is defined as the first defrosting mode; this method of defrosting by using a defrosting hot gas bypass pipeline has a problem of poor defrosting ability, but However, it can ensure that the air conditioner continues to run in the heating mode; in other words, this defrost method has a small effect on the heat generation of the air conditioner.
  • the outdoor heat exchanger 4 has a severe frost phenomenon, the defrost It is difficult to achieve a good defrosting effect with the frost method.
  • connection positions of the two ends of the defrost hot gas bypass pipeline are not fixed, and a technician can set the connection positions of the defrost hot gas bypass pipeline according to the actual use situation, as long as the defrost
  • the hot gas bypass pipeline can introduce the high-temperature and high-pressure heat exchange medium into the outdoor heat exchanger 4.
  • the air conditioner can also perform a reverse circulation of the heat exchange medium in the main circulation circuit, so that the outdoor heat exchanger 4 serves as a condenser. To work to achieve the defrost effect.
  • this defrosting method is defined as the second defrosting mode; this method of reversely circulating the heat exchange medium to achieve defrosting has a good defrosting effect, but
  • the air conditioner needs to stop heating operation, so the operation of the second defrosting mode will inevitably seriously affect the heating capacity of the air conditioner.
  • FIG. 2 is a flowchart of main steps of the defrosting control method of the present invention.
  • the steps of the defrosting control method mainly include:
  • step S1 the control device of the air conditioner can obtain the suction pressure of the air conditioner and the coil temperature of the outdoor unit through the suction pressure sensor and the temperature sensor, so that The control device can use the suction pressure and the coil temperature as basic parameters to determine the frost formation of the outdoor unit.
  • step S2 the control device can selectively cause the air conditioner to enter a corresponding outdoor unit defrost mode according to the suction pressure and the coil temperature. That is, in the control method, the control device can determine the frosting degree of the outdoor unit by combining the suction pressure and the coil temperature, so that the air conditioner can determine the frosting degree of the outdoor unit.
  • the control method of the present invention can make the defrost mode of the air conditioner more intelligent and flexible, thereby being effective Avoiding the problem that the existing air conditioner is likely to seriously affect the heating effect due to the insufficient matching of the defrosting method and the frosting situation, thereby ensuring the heating capacity of the air conditioner to the greatest extent.
  • FIG. 3 is a flowchart of specific steps of the defrosting control method of the present invention.
  • the steps of the defrosting control method specifically include:
  • step S11 the control device of the air conditioner can obtain the suction pressure Ps of the air conditioner and the coil temperature Te of the outdoor unit through the suction pressure sensor and the temperature sensor, So that the control device can use the suction pressure Ps and the coil temperature Te as the basic parameters to determine the frost formation of the outdoor unit.
  • step S12 is executed.
  • the control device can compare the suction pressure Ps with the preset suction pressure P1, and at the same time, compare the coil temperature Te with the first preset temperature T1 and / or the second preset temperature T2, respectively. The comparison is performed to determine the frosting degree of the outdoor unit according to a comparison result between the measured value and the standard value.
  • the preset suction pressure P1 is set to 0.5 MPa.
  • the suction pressure is 0.5 MPa
  • the corresponding saturated evaporation temperature is ⁇ 8.8 ° C.
  • the preset air intake pressure is set.
  • P1 is set to 0.5 MPa to effectively analyze the severity of frost formation of the outdoor unit.
  • the control device also needs to compare the coil temperature Te with the first preset temperature T1 and / or the second preset temperature T2.
  • the first preset temperature T1 is set to -9 ° C
  • the second preset temperature T2 is set to -3 ° C.
  • step S13 if the control device judges that Ps ⁇ P1 and T1 ⁇ Te ⁇ T2, it means that the outdoor unit is still in a light frosting state.
  • the air conditioner enters the first A defrost mode, that is, the air conditioner can directly introduce a part of the high-temperature and high-pressure heat exchange medium discharged from the compressor 1 into the outdoor heat exchanger 4 through the defrost hot gas bypass line, thereby improving outdoor heat exchange
  • the temperature of the device 4 is used to alleviate the frost phenomenon.
  • the air conditioner since the frosting degree of the outdoor unit is still relatively light at this time, the air conditioner only needs to perform auxiliary defrosting through the defrosting hot gas bypass pipeline to achieve the defrost purpose, and at the same time, it can also Effectively ensure that the air conditioner can continuously heat, so as to effectively ensure the heat generation of the air conditioner.
  • step S14 after the air conditioner enters the first defrost mode, if the control device determines that Te ⁇ T3, the air conditioner is caused to exit the first defrost mode. .
  • the control device determines that Te ⁇ T3
  • the air conditioner is caused to exit the first defrost mode.
  • the third preset temperature is 3 ° C; of course, a technician can also set a specific value of the third preset temperature according to actual use requirements.
  • step S15 if the control device determines that Ps ⁇ P1 and Te ⁇ T1, it means that the outdoor unit of the air conditioner is already in a state of severe frost.
  • the air conditioner is made
  • the heater enters the second defrost mode, that is, the heating operation is stopped, and the heat exchange medium in the main circulation circuit of the air conditioner is reversely circulated, so that the outdoor heat exchanger 4 works as a condenser, so as to achieve better defrost. Frost effect. It can be understood that, since the frosting degree of the outdoor unit is already severe at this time, the effect of complete defrost cannot be achieved by running the first defrost mode.
  • a defrost mode so that the outdoor unit can quickly implement defrost, so that the air conditioner can return to a normal heating state as soon as possible.
  • step S16 after the air conditioner enters the second defrost mode, if the control device determines that Te ⁇ T4, the air conditioner is caused to exit the second defrost mode. .
  • the control device determines that Te ⁇ T4
  • the air conditioner is caused to exit the second defrost mode.
  • the control device defaults that the outdoor unit has completed defrosting. At this time, the air conditioner needs to exit the second defrosting mode.
  • the fourth preset temperature is 15 ° C; of course, a technician may also set a specific value of the fourth preset temperature according to actual use requirements.
  • the control device compares the suction pressure Ps with the preset suction pressure P1, and compares the coil temperature Te with the first preset temperature T1 and / or the second preset temperature T2 are compared respectively. If other comparison results appear, it means that it is difficult for the control device to accurately determine the frost condition of the outdoor unit.
  • the air conditioner may also need to Only in combination with other parameters can the frosting condition of the outdoor unit be determined or the determination result can be directly set to the outdoor unit without performing a defrost operation. In other words, the technician can set operations corresponding to other comparison results by himself according to the actual condition of the air conditioner.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
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Abstract

La présente invention concerne le domaine technologique des climatiseurs et concerne en particulier un climatiseur et son procédé de commande de dégivrage d'unité extérieure. La présente invention vise à résoudre le problème selon lequel le climatiseur existant ne peut pas exécuter différents procédés de dégivrage selon différentes conditions, et l'effet de chauffage peut être fortement influencé par le phénomène de givrage de l'unité extérieure. Le procédé de commande de dégivrage d'unité extérieure selon la présente invention est réalisé comme suit : lorsque le climatiseur est dans une opération de chauffage, une pression d'aspiration d'air du climatiseur et une température de tuyau spiralé de l'unité extérieure peuvent être obtenues de telle sorte que le degré de givrage de l'unité extérieure est estimé. En fonction de la pression d'aspiration d'air du climatiseur et de la température de tuyau spiralé de l'unité extérieure, le climatiseur entre de manière sélective dans le mode de dégivrage d'unité extérieure correspondant de telle sorte que le climatiseur peut sélectionner le mode de dégivrage optimal en fonction du degré de dégivrage de l'unité extérieure. En outre, le problème suivant du climatiseur existant est résolu : l'effet de chauffage est fortement influencé, car le mode de dégivrage sélectionné n'est pas mis en correspondance avec l'état de givrage réel.
PCT/CN2019/088231 2018-07-23 2019-05-24 Climatiseur et son procédé de commande de dégivrage d'unité extérieure WO2020019849A1 (fr)

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CN201810814256.4A CN110749072A (zh) 2018-07-23 2018-07-23 空调器及其室外机除霜控制方法
CN201810814256.4 2018-07-23

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CN111425990B (zh) * 2020-03-04 2023-02-24 青岛海尔空调电子有限公司 多联机系统的除霜控制方法
CN111692706B (zh) * 2020-06-05 2022-07-19 宁波奥克斯电气股份有限公司 一种除霜控制方法、装置及空调器
CN112066463A (zh) * 2020-09-18 2020-12-11 广东积微科技有限公司 空调室外机底盘加热器的控制方法、热控制装置及空调
CN113465127A (zh) * 2021-06-22 2021-10-01 青岛海尔空调电子有限公司 空调器的防结霜控制方法及空调器
CN115597187B (zh) * 2022-10-18 2024-05-28 珠海格力电器股份有限公司 一种智能除霜空调、智能除霜方法、装置、设备及介质

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