WO2023279617A1 - Procédé de commande pour mettre en œuvre une fonction d'autonettoyage dans un tuyau spiralé d'échangeur de chaleur extérieur - Google Patents

Procédé de commande pour mettre en œuvre une fonction d'autonettoyage dans un tuyau spiralé d'échangeur de chaleur extérieur Download PDF

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Publication number
WO2023279617A1
WO2023279617A1 PCT/CN2021/129820 CN2021129820W WO2023279617A1 WO 2023279617 A1 WO2023279617 A1 WO 2023279617A1 CN 2021129820 W CN2021129820 W CN 2021129820W WO 2023279617 A1 WO2023279617 A1 WO 2023279617A1
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WIPO (PCT)
Prior art keywords
self
cleaning
heat exchanger
outdoor heat
control method
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PCT/CN2021/129820
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English (en)
Chinese (zh)
Inventor
罗荣邦
崔俊
Original Assignee
青岛海尔空调器有限总公司
青岛海尔空调电子有限公司
海尔智家股份有限公司
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Publication of WO2023279617A1 publication Critical patent/WO2023279617A1/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
    • F24F11/30—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
    • F24F11/83—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
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G15/00—Details
    • F28G15/003—Control arrangements
    • 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
    • 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 relates to the technical field of self-cleaning of air conditioners, in particular to a method for controlling self-cleaning in tubes of outdoor heat exchangers.
  • the dirty blockage mainly includes the dirty blockage outside the tube and the dirty blockage inside the tube.
  • the heat coefficient decreases, and the heat exchange effect between the heat exchanger and the air becomes poor.
  • the internal fouling of the tube is mainly due to the reduction of the heat transfer coefficient between the refrigerant and the heat exchanger coil, which affects the energy transfer of the refrigerant in the tube to the outside.
  • the main factor affecting the internal blockage of the tube is the refrigeration oil.
  • the refrigeration oil in the compressor flows to the hairpin tube of the heat exchanger along with the refrigerant.
  • the hairpin pipe is an internally threaded copper pipe
  • the flow of the refrigeration oil is affected.
  • the refrigerant flow Due to the centrifugal force, part of the refrigerating machine oil cannot return to the inside of the compressor in time, and stays on the inner wall of the threaded copper tube, which hinders the heat transfer between the refrigerant and the coil, reduces the heat transfer temperature difference, and makes the cooling and heating effect of the air conditioner worse.
  • the dirt outside the tube of the outdoor heat exchanger can also be cleaned regularly by humans, or the air conditioner frosting and defrosting operations, etc. to remove dust and impurities on the surface, but the dirt inside the tube is not only one of the main factors affecting the cooling and heating effect of the air conditioner, but also It cannot be cleaned manually. Therefore, how to clean the pipes of the outdoor heat exchanger has become an urgent problem for air-conditioning manufacturers.
  • the application provides a self-cleaning control method in the tube of the outdoor heat exchanger, which is applied to the air conditioner
  • the air conditioner includes a compressor, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger that are sequentially connected through a refrigerant pipeline.
  • the air conditioner also includes a recovery pipeline, one end of which is connected to the outdoor The outlet of the heat exchanger is connected, and the other end of the recovery pipeline is connected with the suction port of the compressor.
  • An on-off valve is arranged on the recovery pipeline, and the on-off valve is a normally closed valve.
  • the self-cleaning control method in the pipe includes:
  • the on-off valve is controlled to open.
  • valve opening conditions include at least one of the following conditions:
  • the exhaust temperature is greater than or equal to the exhaust temperature threshold and lasts for a first set time
  • the exhaust pressure is greater than or equal to the exhaust pressure threshold and lasts for a second set time.
  • the in-pipe self-cleaning control method further includes:
  • the outdoor fan is controlled to stop running.
  • the in-pipe self-cleaning control method further includes:
  • the outdoor fan is controlled to start running.
  • the in-pipe self-cleaning control method further includes:
  • the fan in the control room remains in the current operating state.
  • the in-pipe self-cleaning control method further includes:
  • the step of "exiting the in-pipe self-cleaning mode" further includes:
  • the in-pipe self-cleaning control method further includes:
  • the throttling device After the throttling device is controlled to open to the preset opening for a fourth set time, the throttling device is controlled to return to the opening before entering the pipe self-cleaning mode.
  • the preset opening degree is the maximum opening degree of the throttling device.
  • the self-cleaning frequency is the highest limit frequency corresponding to the outdoor ambient temperature.
  • the air conditioner includes a compressor, an outdoor heat exchanger, a throttling device, and an indoor heat exchanger connected in sequence through a refrigerant pipeline, and the air conditioner also includes a recovery pipeline, which recovers One end of the pipeline is connected to the outlet of the outdoor heat exchanger, and the other end of the recovery pipeline is connected to the suction port of the compressor.
  • An on-off valve is installed on the recovery pipeline, and the on-off valve is a normally closed valve.
  • the self-cleaning control method in the pipeline Including: in response to the received instruction of self-cleaning in the pipe of the outdoor heat exchanger, enter the self-cleaning mode in the pipe; control the throttling device to close to the minimum opening; control the compressor to adjust to the preset self-cleaning frequency; Obtain the discharge temperature and/or discharge pressure of the compressor at intervals; judge whether the valve opening condition is established based on the obtained discharge temperature and/or discharge pressure; when the valve opening condition is satisfied, control the on-off valve to open .
  • the control method of the present application can realize the self-cleaning of the outdoor heat exchanger, and solve the problem of internal fouling of the tube of the outdoor heat exchanger. Specifically, by controlling the throttling device to close to the minimum opening, the refrigerant discharged from the compressor is accumulated in the outdoor heat exchanger, so that the temperature and pressure of the refrigerant increase rapidly in a short period of time.
  • the exhaust pressure judges that when the valve opening condition is established, the on-off valve is opened, and the rapid flow of high-temperature and high-pressure refrigerant can be used to effectively flush the inside of the coil of the outdoor heat exchanger, and the oil on the inner wall of the coil is washed away and released with the refrigerant. Together, they are directly returned to the interior of the compressor by the recovery pipeline to realize self-cleaning of the outdoor heat exchanger.
  • the oil stain can be directly brought back to the compressor for recovery during the self-cleaning process, reducing the flow stroke of the high-temperature refrigerant, reducing the pressure drop of the refrigerant, improving the self-cleaning effect, saving self-cleaning time, and ensuring user experience.
  • Fig. 1 is the system diagram of the air conditioner of the present application
  • Fig. 2 is the flowchart of the self-cleaning control method in the tube of the outdoor heat exchanger of the present application
  • Fig. 3 is a logic diagram of a possible implementation process of the method for controlling self-cleaning in tubes of an outdoor heat exchanger of the present application.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components.
  • FIG. 1 is a system diagram of the air conditioner of the present application.
  • the air conditioner includes a compressor 1 , a four-way valve 2 , an outdoor heat exchanger 3 , a throttling device 4 , an indoor heat exchanger 5 and a liquid accumulator 9 .
  • the exhaust port of compressor 1 communicates with the P interface of four-way valve 2 through refrigerant pipeline 6, and the C interface of four-way valve 2 communicates with the inlet of outdoor heat exchanger 3 through refrigerant pipeline 6.
  • the outlet communicates with one port of the throttling device 4 through the refrigerant pipeline 6, and the other port of the throttling device 4 communicates with the inlet of the indoor heat exchanger 5 through the refrigerant pipeline 6, and the outlet of the indoor heat exchanger 5 passes through the refrigerant pipeline 6 is connected with the E port of the four-way valve 2, the S port of the four-way valve 2 is connected with the inlet of the accumulator 9 through the refrigerant pipeline 6, and the outlet of the accumulator 9 is connected with the suction port of the compressor 1 through the pipeline .
  • the throttling device 4 is preferably an electronic expansion valve, and a filter is provided in the liquid storage 9, and the liquid storage 9 can store refrigerant, separate gas and liquid of refrigerant, filter oil, eliminate noise, and buffer refrigerant.
  • the air conditioner also includes a recovery pipeline 7 and an on-off valve 8.
  • the recovery pipeline 7 adopts a copper tube with a smooth inner wall.
  • the on-off valve 8 is preferably a solenoid valve.
  • the solenoid valve is a normally closed valve and is arranged on the recovery pipeline 7.
  • the solenoid valve communicates with the controller of the air conditioner to receive the opening and closing signals issued by the controller.
  • the on-off valve 8 can also be an electronically controlled valve such as an electronic expansion valve.
  • control method for self-cleaning in the pipe of the outdoor heat exchanger in this embodiment will be described below in conjunction with the structure of the above-mentioned air conditioner, but those skilled in the art can understand that the specific structural composition of the air conditioner is not static, and those skilled in the art can understand It is adjusted, for example, one or all of the four-way valve 2 and the liquid reservoir 9 can be omitted, or other components can be added on the basis of the structure of the above-mentioned air conditioner.
  • FIG. 2 is a flow chart of the control method for in-pipe self-cleaning of the outdoor heat exchanger of the present application.
  • the self-cleaning control method in the tube of the outdoor heat exchanger of the present application includes:
  • the user can actively issue the instruction for self-cleaning of the outdoor heat exchanger, such as sending an instruction to the air conditioner through a button on the remote control, or sending an instruction through a terminal communicatively connected with the air conditioner,
  • the terminal can be an APP installed on the smart device, and the APP sends instructions to the air conditioner directly or through the cloud.
  • smart devices include but are not limited to mobile phones, tablet computers, smart speakers, smart watches, etc.
  • the ways of communication and connection between smart devices and air conditioners or the cloud include but not limited to wifi, bluetooth, infrared, 3G/4G/5G, etc.
  • the air conditioner After the air conditioner receives the instruction to perform in-pipe self-cleaning on the outdoor heat exchanger, it switches the operation mode to the in-pipe self-cleaning mode, and starts to perform in-pipe self-cleaning on the coil of the outdoor heat exchanger.
  • the in-pipe self-cleaning mode can be a computer program, which is pre-stored in the air conditioner. When operating this mode, the air conditioner controls the operation of each component of the air conditioner according to the steps set by the program.
  • the self-cleaning instruction can also be automatically issued when the air conditioner meets certain entry conditions, such as issuing an instruction to perform in-pipe self-cleaning on the outdoor heat exchanger when the cumulative working time of the air conditioner reaches a preset duration, where the preset duration is, for example, It can be 20h-40h.
  • the electronic expansion valve is controlled to close to a minimum opening degree, that is, a state where the opening degree is 0. At this time, the electronic expansion valve achieves full throttling, and the refrigerant cannot flow through.
  • a minimum opening degree that is, a state where the opening degree is 0.
  • the electronic expansion valve achieves full throttling, and the refrigerant cannot flow through.
  • the on-off valve is a normally closed valve and the electronic expansion valve is closed to the minimum opening, all the refrigerant discharged by the compressor is accumulated in the In the outdoor heat exchanger, part of the refrigerant pipeline and part of the recovery pipeline.
  • the self-cleaning frequency is a frequency determined in advance through experiments. This frequency can be close to or reach the maximum operating frequency of the compressor.
  • the pressure of the refrigerant discharged from the exhaust port will Both the temperature and temperature are high, so the refrigerant discharged from the compressor can be quickly heated and boosted.
  • the self-cleaning frequency is the highest limit frequency corresponding to the outdoor ambient temperature.
  • the operating frequency of the compressor is affected by the outdoor ambient temperature and cannot be increased indefinitely, otherwise the phenomenon of high temperature protection shutdown of the compressor will easily occur, which will have a negative impact on the life of the compressor. Therefore, the compressors are equipped with protective measures. Under different outdoor ambient temperatures, the corresponding maximum frequency limit is set.
  • the self-cleaning frequency in this application is the maximum frequency limit of the compressor at the current outdoor ambient temperature. Under the limit value, the compressor can discharge and accumulate the refrigerant in the shortest time. Wherein, the manner of obtaining the outdoor ambient temperature is a conventional means in the field, and will not be repeated here.
  • the self-cleaning frequency may exist. Different, therefore those skilled in the art can set the self-cleaning frequency based on specific application scenarios, as long as the setting of the frequency can make the refrigerant discharged by the compressor have a higher pressure and a higher temperature.
  • the discharge temperature of the compressor can be acquired by setting a temperature sensor at the discharge port of the compressor, and the discharge pressure can be obtained by setting a pressure sensor at the discharge port of the compressor.
  • the first interval time can be any value from 1s to 5s, and the selection of this value is related to the rising speed of the exhaust temperature and/or exhaust pressure and the control accuracy to be achieved in this application.
  • the first interval time can be selected as 1s, 2s or shorter time, if If the frequency of self-cleaning is relatively small, the rising rate of exhaust temperature and/or exhaust pressure is slow, or the control method of this application does not need to achieve high precision, the first interval time can be selected as 4s, 5s or longer.
  • the first interval time is selected as 1s, and both the exhaust temperature and the exhaust pressure need to be acquired. That is to say, after the compressor reaches the self-cleaning frequency, the discharge temperature and the discharge pressure of the compressor are acquired simultaneously every 1s.
  • the valve opening condition includes at least one of the following conditions: (1) the exhaust temperature is greater than or equal to the exhaust temperature threshold and lasts for a first set time; (2) the exhaust pressure is greater than or equal to the exhaust pressure threshold and last for a second set time.
  • the discharge temperature is greater than or equal to the discharge temperature threshold and lasts for the first set time, it proves that the refrigerant accumulated behind the discharge port of the compressor has reached a relatively high temperature at this time.
  • the discharge pressure is greater than or equal to the discharge pressure threshold and lasts for the second set time, it proves that the refrigerant accumulated behind the discharge port of the compressor has reached a relatively high pressure.
  • valve opening conditions are only a more preferred implementation mode.
  • those skilled in the art can adjust the above-mentioned valve opening conditions, as long as the adjusted conditions can correctly judge The state of the refrigerant accumulated after the compressor is sufficient.
  • the valve opening condition may only include one of the above two conditions; or the valve opening condition may only include the judgment of temperature/pressure, while omitting the judgment of duration.
  • the on-off valve is controlled to be opened.
  • the high-temperature and high-pressure refrigerant accumulated between the discharge port of the compressor and the electronic expansion valve flows back to the accumulator through the recovery pipeline, and then is compressed by the compressor to pass through the exhaust again.
  • the outlet is discharged to realize the circulation of the refrigerant.
  • the rapid flow impact of the high-temperature and high-pressure refrigerant is used to clean the oil stains attached to the inner wall of the coil of the outdoor heat exchanger, and the washed oil stains are directly recycled to the liquid receiver through the recovery pipeline to achieve oil filtration and treatment. Oil recovery.
  • the refrigerant discharged from the compressor accumulates in the outdoor heat exchanger and some pipelines, so that the temperature and pressure of the refrigerant increase rapidly in a short time.
  • the on-off valve is opened, and the rapid flow of high-temperature and high-pressure refrigerant can be used to effectively flush the inside of the coil of the outdoor heat exchanger and wash away the oil on the inner wall of the coil. And together with the refrigerant, it is directly returned to the inside of the liquid receiver by the recovery pipeline to realize the self-cleaning of the outdoor heat exchanger.
  • the application can use the recovery pipeline to recover the refrigeration oil during the self-cleaning process of the outdoor heat exchanger, and realize the high-temperature and high-pressure refrigerant in the outdoor heat exchanger.
  • the oil is directly brought back to the liquid reservoir for recovery and filtration without going through the indoor heat exchanger again, and then compressed and discharged by the compressor again, which reduces the flow stroke of high-temperature refrigerant, reduces the pressure drop along the way, and improves Self-cleaning effect in the tube.
  • the recovered refrigerating machine oil can be filtered to prevent impurities in the refrigerating machine oil from continuing to participate in the refrigerant cycle.
  • control method for in-pipe self-cleaning further includes: before acquiring the discharge temperature and/or discharge pressure of the compressor, controlling the outdoor fan to stop running. Specifically, after entering the self-cleaning mode in the pipe, the outdoor fan is firstly controlled to stop running, so as to reduce the heat exchange effect between the outdoor heat exchanger and the air, so as to speed up the temperature and pressure of the refrigerant, so that the control method can reach the opening as soon as possible. valve condition.
  • the method for controlling self-cleaning in the pipe further includes: controlling the outdoor fan to start running while or after controlling the opening of the on-off valve.
  • controlling the outdoor fan to start running while or after controlling the opening of the on-off valve since the refrigerant discharged from the compressor directly returns to the compressor without passing through the indoor heat exchanger, the temperature inside the compressor gradually rises, and there is a risk of compressor shutdown due to high temperature protection.
  • the inventor found through repeated calculations, tests, observations and comparisons that by turning on the outdoor fan at the same time as or after the on-off valve is opened, the compressor can be prevented from shutting down due to high temperature protection and the compression can be ensured.
  • the refrigerant discharged from the machine is in the temperature and pressure range that meets the self-cleaning conditions.
  • the speed of the outdoor fan can be controlled by referring to the cooling mode control method, or can be controlled by a fixed speed method, but in general, the premise of controlling the operation of the outdoor fan is to avoid high temperature protection shutdown, and to control the self-cleaning mode in the pipe. Run with as little impact as possible.
  • the liquefied refrigerant can be recovered through the liquid receiver, which is not enough to have a substantial impact on the self-cleaning process in the pipe.
  • the method for controlling the self-cleaning in the duct further includes: during the operation of the self-cleaning mode in the duct, controlling the indoor fan to maintain the current operating state. Specifically, since indoor users also need to adjust the indoor temperature while performing self-cleaning in the pipe, the application controls the indoor fan to maintain the current running state, which can make the indoor air circulate, ensure that the indoor air is in a flowing state, and improve user experience.
  • the method for controlling self-cleaning in the pipe further includes: exiting the self-cleaning mode in the pipe after the on-off valve is opened for a third set time.
  • the third set time can be any value in 3min-10min, preferably 5min in this application.
  • the step of exiting the self-cleaning mode in the pipe further includes: controlling the compressor to return to the frequency before entering the self-cleaning mode in the pipe, controlling the throttling device to open to a preset opening degree, and controlling the on-off valve to close.
  • the air conditioner needs to return to the operating mode before the in-pipe self-cleaning, so as to continue to adjust the indoor temperature. Still taking the air conditioner running in the cooling mode before entering the in-duct cleaning mode as an example, after executing the in-duct self-cleaning mode, it needs to switch back to the cooling mode.
  • control the frequency of the compressor to return from the self-cleaning frequency to the frequency before entering the tube for self-cleaning control the electronic expansion valve to open to the preset opening degree, and control the on-off valve to close, so that the refrigerant flows in the normal cooling mode.
  • the preset opening is the maximum opening of the throttling device. Since most of the refrigerant circulates between the compressor and the outdoor heat exchanger during the operation of the self-cleaning mode in the pipe, the refrigerant in the indoor heat exchanger is missing, so it will save energy.
  • the flow device is adjusted to the maximum opening, so that the refrigerant can quickly fill the indoor heat exchanger, so as to realize the normal circulation of the refrigerant as soon as possible.
  • the throttling device is controlled to open to a preset opening degree for a fourth set time
  • the throttling device is controlled to return to the opening degree before entering the self-cleaning mode in the pipe.
  • the fourth setting time can be any value within 1min-5min, and it is preferably 3min in this application.
  • the way to exit the self-cleaning mode in the pipe is not limited to the above-mentioned one.
  • the air conditioner can be restored to the operating state before entering the self-cleaning mode in the pipe
  • those skilled in the art can freely choose a specific control method. The selection did not depart from the principles of the application. For example, it is possible to directly control all components to return to the operating state before entering the self-cleaning mode in the tube, or to control one or several components to return to the operating state before entering the self-cleaning mode in the tube, and then gradually restore all components to the operating state before entering the self-cleaning mode in the tube.
  • the operating state before entering the in-line self-cleaning mode.
  • FIG. 3 is a logic diagram of a possible implementation process of the control method for self-cleaning in tubes of outdoor heat exchangers of the present application.
  • the air conditioner enters the self-cleaning mode in the pipe, that is, controls the electronic expansion valve to close to the minimum opening, controls the frequency of the compressor to increase to the maximum frequency corresponding to the outdoor ambient temperature, controls the outdoor fan to stop running, and controls the indoor fan to maintain current speed.
  • step S203 is executed to acquire the discharge temperature Td and discharge pressure Pd of the compressor.
  • step S205 is executed to determine whether at least one of Td ⁇ T and Pd ⁇ P holds true, where T is the exhaust temperature threshold, and P is the exhaust pressure threshold.
  • T is the exhaust temperature threshold
  • P is the exhaust pressure threshold.
  • step S209 is executed to judge whether the solenoid valve open duration t1 ⁇ 5min is established; if the judgment result is true, then step S211 is executed; otherwise, when the judgment result is not established, then return to continue execution of step S209.
  • S211 exit the in-pipe self-cleaning mode, specifically, control the electronic expansion valve to open to the maximum opening, control the compressor to return to the frequency before entering the in-pipe self-cleaning mode, and control the solenoid valve to close.
  • step S213 is executed to judge whether the duration t2 ⁇ 3min from the opening of the electronic expansion valve to the maximum opening is established; if the judgment result is true, execute step S215; otherwise, if the judgment result is not established, return to continue to execute step S213.
  • the above air conditioner also includes some other known structures, such as a processor, a controller, a memory, etc.
  • the memory includes but not limited to random access memory, flash memory, read-only memory, programmable read-only memory, Volatile memory, non-volatile memory, serial memory, parallel memory or registers, etc.
  • processors include but not limited to CPLD/FPGA, DSP, ARM processors, MIPS processors, etc.
  • step S205 is described in conjunction with simultaneously judging the two conditions of Td ⁇ T and Pd ⁇ P, those skilled in the art can understand that the above two conditions can also be judged sequentially.

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  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Air Conditioning Control Device (AREA)

Abstract

La présente invention concerne le domaine technique des fonctions d'autonettoyage de climatiseurs et concerne plus particulièrement un procédé de commande pour mettre en œuvre une fonction d'autonettoyage dans un tuyau spiralé d'un échangeur de chaleur extérieur. La présente invention vise à résoudre le problème de la réalisation d'une fonction d'autonettoyage dans un tuyau spiralé d'un échangeur de chaleur extérieur. Pour atteindre cet objectif, un climatiseur de la présente invention comprend une conduite de récupération, une extrémité de la conduite de récupération étant en communication avec une sortie d'un échangeur de chaleur extérieur, et l'autre extrémité de celle-ci étant en communication avec un orifice d'aspiration de gaz d'un compresseur ; et une vanne marche-arrêt est disposée sur la conduite de récupération. Le procédé de commande comprend les étapes suivantes : en réponse à une instruction de mise en œuvre d'une fonction d'autonettoyage de tuyau spiralé reçue, l'entrée dans un mode d'autonettoyage de tuyau spiralé ; la commande d'un appareil d'étranglement afin qu'il soit fermé à l'ouverture minimale ; la commande du compresseur afin qu'il soit ajusté à une fréquence d'autonettoyage prédéfinie ; à chaque premier temps d'intervalle, l'acquisition d'une température d'échappement et/ou d'une pression d'échappement du compresseur ; sur la base de la température d'échappement et/ou de la pression d'échappement acquises, la détermination de la satisfaction ou non d'une condition d'ouverture de vanne ; et lorsque la condition d'ouverture de vanne est satisfaite, la commander de l'ouverture d'une vanne marche-arrêt. Au moyen de la présente demande, une fonction d'autonettoyage d'un échangeur de chaleur extérieur peut être mise en œuvre, ce qui permet de résoudre le problème de blocage par la saleté dans un tuyau spiralé de l'échangeur de chaleur extérieur.
PCT/CN2021/129820 2021-07-09 2021-11-10 Procédé de commande pour mettre en œuvre une fonction d'autonettoyage dans un tuyau spiralé d'échangeur de chaleur extérieur WO2023279617A1 (fr)

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