WO2020135589A1 - Système de climatisation, et procédé et dispositif de dégivrage par inversion de cycle pour celui-ci - Google Patents

Système de climatisation, et procédé et dispositif de dégivrage par inversion de cycle pour celui-ci Download PDF

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Publication number
WO2020135589A1
WO2020135589A1 PCT/CN2019/128711 CN2019128711W WO2020135589A1 WO 2020135589 A1 WO2020135589 A1 WO 2020135589A1 CN 2019128711 W CN2019128711 W CN 2019128711W WO 2020135589 A1 WO2020135589 A1 WO 2020135589A1
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WIPO (PCT)
Prior art keywords
conditioning system
air conditioning
throttle element
air
preset
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PCT/CN2019/128711
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English (en)
Chinese (zh)
Inventor
吴建华
杜彦君
王澈
李金波
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广东美的制冷设备有限公司
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Publication of WO2020135589A1 publication Critical patent/WO2020135589A1/fr

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    • 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
    • F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
    • F25B47/02—Defrosting cycles
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/38—Expansion means; Dispositions thereof specially adapted for reversible cycles, e.g. bidirectional expansion restrictors
    • 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 present application relates to the technical field of air conditioning systems, in particular to an air conditioning system and a reverse cycle defrosting method and device of the air conditioning system.
  • frost problem has a greater impact on the normal heating of the air conditioning system in winter, especially in cold and high humidity areas.
  • the thick frost layer will not only weaken the heat transfer coefficient of the outdoor unit, but also greatly reduce the heating capacity of the air conditioning system. , And continuous operation will cause damage to the compressor.
  • the more common reverse cycle defrosting of defrosting of air conditioning systems which reverses the general heating cycle through the four-way valve reversal, after the four-way valve reversal, the outdoor unit changes from the evaporator in the heating process to The high-temperature and high-pressure refrigerant at the condenser and compressor outlet gradually melts the frost layer of the outdoor unit.
  • the indoor and outdoor fans are turned off, and there is almost no heat transfer on the indoor side.
  • the energy used for defrosting comes from the power consumption of the compressor and the heat stored in the indoor unit piping at the end of heating. Due to the low power of the compressor after adjustment and the sudden increase in superheat after throttling, it will cause the clogging of the throttle element and the abnormality of the throttle element, and the abnormal clogging of the throttle element will not only cause the capacity of the air conditioning system to decrease and decrease The stability and reliability of the air conditioning system.
  • the embodiment of the present application solves the problem of abnormality of the throttle element due to the clogging of the throttle element lubricating oil in the prior art by providing an air conditioning system and a reverse cycle defrosting method and device of the air conditioning system, which greatly reduces the throttle
  • the probability of abnormal blockage of components greatly enhances the stability and reliability of the air conditioning system.
  • the present application provides a reverse cycle defrosting method for an air conditioning system, including the following steps: controlling the air conditioning system to perform reverse cycle defrosting; controlling the opening of the throttle element in the air conditioning system during the reverse cycle defrosting process The degree gradually decreases.
  • reverse cycle defrosting method of the air conditioning system according to the above embodiment of the present application may also have the following additional technical features:
  • the controlling the opening degree of the throttle element in the air conditioning system during the reverse cycle defrosting process to gradually decrease includes:
  • the acquiring the opening adjustment amount of the throttle element according to the operation duration includes: acquiring a product between the operation duration and a preset adjustment step as the opening adjustment amount.
  • the method further includes: identifying that the opening degree of the throttle element at the current time is less than a second preset opening degree, and controlling the throttle The opening of the element is updated to the second preset opening.
  • the controlling the air conditioning system to perform reverse cycle defrosting includes: recognizing that the air conditioning system needs to end heating, controlling the air conditioning system to end heating and staying for a first preset duration; controlling the The four-way valve in the air conditioning system is switched from the current direction to the set direction and stays for the second preset duration; the air conditioning system is controlled to enter a reverse cycle defrosting mode.
  • the above-mentioned reverse cycle defrosting method of the air conditioning system further includes: controlling the opening degree of the throttle element to be a third preset opening degree before the end of heating; controlling the throttle element After the heating is completed, the element is adjusted from the third preset opening degree to the first preset opening degree until the air conditioning system enters the defrosting mode; wherein, the first preset opening degree is greater than or equal to the first Three preset openings.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than a first preset value; controlling the The air conditioning system immediately triggers the four-way valve reversal.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than a second preset value; controlling the The air conditioning system immediately triggers entry into the reverse cycle defrost mode.
  • the controlling the opening degree of the throttle element in the air conditioning system to gradually decrease during the reverse cycle defrosting process further includes: acquiring the outlet temperature of the condenser in the air conditioning system; identifying the outlet If the temperature is greater than the first set temperature, control the air conditioning system to start adjusting the opening of the throttle element; continuously detect the outlet temperature, identify that the outlet temperature is greater than the second set temperature, and control the air conditioning system to end immediately Reverse cycle defrost.
  • the above-mentioned reverse cycle defrosting method of the air conditioning system further includes: controlling the air conditioning system to end the reverse cycle defrosting and staying for a third preset duration; controlling the four-way valve in the air conditioning system Switching from the set direction to the current direction, and staying for a fourth preset duration; controlling the air conditioning system to restart heating.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: controlling the opening of the throttle element to be the second preset opening before defrosting ends; controlling the The flow element is adjusted from the second preset opening degree to the first preset opening degree after the defrosting ends, until the air conditioning system enters the heating mode; wherein, the first preset opening degree is greater than The second preset opening is described.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than a third preset value; controlling the The air conditioning system immediately triggers the four-way valve reversal.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than a fourth preset value; controlling the The air conditioning system enters the heating mode.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: acquiring the outlet temperature of the condenser in the air-conditioning system; identifying that the outlet temperature is less than a third set temperature, and controlling the air conditioner The system starts to adjust the opening of the throttle element; continuously detects the outlet temperature, recognizes that the outlet temperature is less than the fourth set temperature, and controls the air conditioning system to immediately end heating.
  • the above-described reverse cycle defrosting method of the air conditioning system further includes: controlling the opening of the throttle element to gradually decrease from the fourth preset opening to the temperature after reheating The third preset opening.
  • the present application provides a reverse cycle defrosting device for an air conditioning system, including: a first control module for controlling the air conditioning system for reverse cycle defrosting; and a second control module for defrosting in the reverse cycle
  • the process control gradually reduces the opening of the throttle element in the air conditioning system.
  • reverse cycle defrosting device of the air conditioning system may also have the following additional technical features:
  • the second control module is specifically configured to: obtain the operating duration of the reverse cycle defrosting; according to the operating duration, obtain the opening adjustment amount of the throttling element, according to the opening The degree adjustment amount and the first preset opening degree of the throttle element at the defrosting start time, to obtain the opening degree of the throttle element at the current time.
  • the second control module is further configured to: obtain a product between a running time and a preset adjustment step as the opening adjustment amount.
  • control module obtains the opening degree of the throttle element at the current moment, it is also used to: identify that the opening degree of the throttle element at the current moment is less than the second preset opening degree, and control The opening of the throttle element is updated to the second preset opening.
  • the first control module is specifically configured to: identify that the air conditioning system needs to end heating, control the air conditioning system to end heating and stay for the first preset duration; control the air conditioning system The four-way valve in is switched from the current direction to the set direction and stays for the second preset duration; the air conditioning system is controlled to enter a reverse cycle defrosting mode.
  • the above-described reverse cycle defrosting device of the air-conditioning system further includes: a third control module for controlling the opening of the throttle element to a third preset opening before the end of heating A fourth control module for controlling the throttle element to adjust from the third preset opening degree to the first preset opening degree after the heating is completed, until the air conditioning system enters the defrosting mode; wherein, The first preset opening degree is greater than or equal to the third preset opening degree.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a first identification module for identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system is less than the first A preset value; a fifth control module, configured to control the air conditioning system to continue to stay at the first preset duration and immediately trigger the four-way valve to switch direction.
  • the above-mentioned reverse cycle defrosting device of the air-conditioning system further includes: a second identification module for identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than the second A preset value; a sixth control module, configured to control the air conditioning system to continue to stay in the second preset duration and immediately trigger the entry into the reverse cycle defrosting mode.
  • the second control module is specifically configured to: obtain the outlet temperature of the condenser in the air conditioning system; identify that the outlet temperature is greater than the first set temperature, and control the air conditioning system to start adjustment The opening of the throttle element; continuously detecting the outlet temperature, identifying that the outlet temperature is greater than the second set temperature, and controlling the air conditioning system to immediately end the reverse cycle defrosting.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a seventh control module for controlling the air conditioning system to end the reverse cycle defrosting and stay for a third preset duration; the eighth control A module for controlling the four-way valve in the air conditioning system to switch from the set direction to the current direction, and staying for a fourth preset duration; controlling the air conditioning system to restart heating.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a ninth control module for controlling the opening of the throttle element to be the second preset before the defrosting ends Opening degree; a tenth control module for controlling the throttle element to adjust from the second preset opening degree to the first preset opening degree after defrosting is completed, until the air conditioning system enters heating Mode; wherein, the first preset opening degree is greater than the second preset opening degree.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a third identification module for identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system is less than the third The preset value; the eleventh control module is used to control the air-conditioning system to immediately trigger the four-way valve commutation.
  • the above-described reverse cycle defrosting device of the air-conditioning system further includes: a fourth identification module for identifying that the difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than the fourth Preset value; a twelfth control module, used to control the air conditioning system to enter the heating mode.
  • the above-described reverse cycle defrosting device of the air conditioning system further includes: an acquisition module for acquiring the outlet temperature of the condenser in the air conditioning system; a thirteenth control module for identifying the The outlet temperature is less than the third set temperature, and the air conditioning system is controlled to start adjusting the opening of the throttle element; the fourteenth control module is used to continuously detect the outlet temperature and recognize that the outlet temperature is less than the fourth set Temperature, control the air-conditioning system to end heating immediately.
  • the above-mentioned reverse cycle defrosting device of the air-conditioning system further includes: a fifteenth control module for controlling the opening of the throttle element from the fourth pre-heating after reheating The opening degree is gradually reduced to the third preset opening degree.
  • the present application proposes an air conditioning system, including the above-mentioned reverse cycle defrosting device of the air conditioning system.
  • the present application proposes an electronic device, including a memory, a processor, and a program stored on the memory and executable on the processor, characterized in that when the processor executes the program, the foregoing The reverse cycle defrosting method of the air conditioning system.
  • the present application proposes a computer-readable storage medium on which a computer program is stored.
  • the program is executed by a processor, the above-mentioned reverse cycle defrosting method of an air-conditioning system is realized.
  • the air conditioning system can be controlled to perform reverse cycle defrosting, and the opening of the throttle element in the air conditioning system is gradually reduced during the reverse cycle defrosting process, so that the compressor discharges the lubrication to the air conditioning system during the defrosting process
  • the amount of oil is reduced, which effectively avoids the abnormality of the throttle element due to the clogging of the throttle element lubricating oil, which greatly reduces the probability of the throttle element being abnormally blocked, and greatly enhances the stability and reliability of the air conditioning system.
  • FIG. 1 is a flowchart of a reverse cycle defrosting method of an air-conditioning system according to an embodiment of the present application
  • FIG. 2 is a flowchart of a reverse cycle defrosting method of an air conditioning system according to an embodiment of the present application
  • FIG. 3 is a flowchart of an initialization method of an electronic expansion valve in an air conditioning system according to a specific embodiment of the present application
  • FIG. 4 is a schematic diagram of adjusting the opening of the throttle element at different times according to an embodiment of the present application
  • FIG. 5 is a block schematic diagram of a reverse cycle defrosting device of an air conditioning system according to an embodiment of the present application
  • FIG. 6 is a block diagram of an air-conditioning system according to an embodiment of the present application.
  • FIG. 7 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • This application can control the air conditioning system to perform reverse cycle defrosting, and control the opening of the throttle element in the air conditioning system to gradually decrease during the reverse cycle defrosting process, thereby reducing the amount of lubricating oil discharged by the compressor into the air conditioning system during the defrosting process.
  • the reverse cycle defrosting method of the air conditioning system includes the following steps:
  • frost problem will have a greater impact on the normal heating of the air conditioning system in winter, especially in cold and high humidity areas, the thick frost layer will not only weaken the heat transfer coefficient of the outdoor unit, making the air conditioning system heating The capacity is greatly reduced, and continued work will also cause compressor damage. Therefore, the reverse cycle defrosting of the air conditioning system can be controlled to solve this problem.
  • controlling the air conditioning system to perform reverse cycle defrosting includes: recognizing that the air conditioning system needs to end heating, controlling the air conditioning system to end heating and staying for the first preset duration; controlling the four-way valve in the air conditioning system from Switch the current direction to the set direction and stay for the second preset duration; control the air conditioning system to enter the reverse cycle defrost mode.
  • controlling the air conditioning system to perform reverse cycle defrosting may include the following two stages: heating shutdown to four-way valve reversal stage and four-way valve reversal to defrost stage.
  • the air conditioning system may be controlled to end heating and stay for a period of time.
  • the four-way valve in the air conditioning system may be controlled to switch from the current direction to Set the direction and stay the air conditioning system for a period of time.
  • the stay time reaches the second preset duration, control the air conditioning system to enter the reverse cycle defrosting mode.
  • the setting direction, the first preset duration and the second preset duration can be set according to the actual situation.
  • the first preset duration and the second preset duration can be the same or inconsistent. Make specific restrictions.
  • control the air conditioning system when identifying that the air conditioning system needs to end heating, control the air conditioning system to end heating and stay for 40s, then control the four-way valve in the air conditioning system to switch from the current direction to the set direction and stay again for 40s, then control the air conditioning The system enters the reverse cycle defrost mode. It should be noted that how to recognize that the air conditioning system needs to end heating will be elaborated below, and in order to avoid redundancy, it will not be described in detail here.
  • the reverse cycle of the general heating cycle is mainly realized by the four-way valve commutation.
  • the outdoor unit changes from the evaporator of the heating process to the condenser.
  • the high-temperature and high-pressure refrigerant at the compressor outlet gradually melts the frost layer of the outdoor unit.
  • the indoor and outdoor fans are turned off, and there is almost no heat transfer on the indoor side.
  • the energy used for defrosting comes from the power consumption of the compressor and the heat stored in the indoor unit piping at the end of heating.
  • the larger opening of the throttle element can ensure a larger flow rate in the early stage of defrosting and avoid the abnormal phenomenon of the throttle element in the defrost, it is more likely to cause no overcooling and suction before the throttle in the middle and late stages of defrosting.
  • the inlet refrigerant is in a saturated state, which causes more refrigerant to accumulate in the accumulator and the suction-carrying liquid causes wet compression of the cylinder.
  • the accumulation of a large amount of refrigerant in the accumulator means that there is a serious lack of refrigerant in the two devices.
  • the storage of more refrigerant in the accumulator is not conducive to the capacity of the air conditioning system at the initial stage of heating.
  • the outdoor unit In the initial stage of heating after the defrosting is completed, the outdoor unit lacks refrigerant and the suction temperature is too low and low pressure is very easy to cause the safety problem of the R290 refrigeration cycle.
  • the larger opening of the throttling element in the defrosting process will also reduce the cooling flow rate after throttling, resulting in an increase in the refrigerant pressure resistance of the indoor unit pipeline, so that a large amount of lubricating oil must reside in the pipeline in the low pressure area.
  • the refrigerant with lower speed and larger dryness is taken away.
  • the lack of refrigerant (especially the outdoor unit) of the two devices will cause the compressor power to be low and the superheat suddenly increase after throttling, resulting in the clogging of the throttling element lubricating oil, resulting in The throttle element is abnormal.
  • the reverse cycle defrosting method of the air conditioning system controls the opening of the throttle element in the air conditioning system to gradually decrease during the reverse cycle defrosting process, thereby increasing the overall temperature of the compressor after the defrost.
  • the amount of lubricating oil discharged from the compressor to the air conditioning system during the defrosting process is reduced, which can avoid excessive refrigerant from being stored in the compressor and the accumulator at the end of defrosting; at the same time, it can avoid the defrosting shutdown and after heating the initial valve
  • the low temperature and low pressure can effectively solve the problem of abnormal oil clogging of the throttle element in the defrosting process and the initial reheating.
  • Fig. 2 is a flowchart of a reverse cycle defrosting method of an air conditioning system according to a specific exemplary embodiment. As shown in FIG. 2, in a specific embodiment of the present application, the above-mentioned reverse cycle defrosting method of the air conditioning system includes the following steps:
  • S201 Control the air conditioning system to perform reverse cycle defrosting.
  • the timer may be started to count time to obtain the operating duration of the reverse cycle defrosting of the air conditioning system.
  • the above method for obtaining the running time of the reverse cycle defrosting is only exemplary and is not intended to be a limitation of the present application.
  • S203 Obtain the opening adjustment amount of the throttle element according to the running time, and obtain the opening degree of the throttle element according to the opening adjustment amount and the first preset opening degree of the throttle element at the defrosting start time.
  • acquiring the opening adjustment amount of the throttle element according to the operation duration includes: acquiring a product between the operation duration and the preset adjustment step length as the opening adjustment amount.
  • the mapping relationship between the running time and the opening adjustment amount of the throttle element can be preset, for example, the product between the running time and the preset adjustment step can be used as the opening adjustment amount, the preset adjustment step It can be set according to the actual situation. After the operation time of the reverse cycle defrosting is obtained, the opening adjustment amount can be obtained through calculation.
  • the reverse cycle defrosting can be divided into two stages, the reverse cycle defrosting process 3-1 stage and the reverse cycle defrosting process 3-2 stage, the first preset at the beginning of the defrost
  • the opening degree may be B2, and at the beginning of the defrosting, the opening degree of the throttle element gradually decreases from B2 to B3, and the opening degree B3 of the throttle element is maintained in the reverse cycle defrosting process 3-1 stage.
  • the preset adjustment step size can be ⁇ B
  • the size of the first preset opening B2 is related to the relationship between the maximum flow diameter of the throttle element and the diameter of the air conditioning system.
  • the first preset opening B2 is the maximum opening allowed by the throttle element, otherwise the first preset opening B2 is 0.5 times the diameter of the air-conditioning system to ensure the rapid balance of pressure in the high and low pressure areas and shorten the time for the high and low pressure drop;
  • the size of the opening B3 of the throttling element is such that the time for the condensation temperature to rise to tep1 is the shortest, and the minimum value of the fifth preset opening B3 B3 min ⁇ 2B1; the preset adjustment step can be ⁇ B 0-0.1 Constant between B2; running time t is a constant between 0-30 and the unit is second.
  • the opening degree of the throttle element at the current time after acquiring the opening degree of the throttle element at the current time, it further includes: identifying that the opening degree of the throttle element at the current time is less than the second preset opening degree, and controlling the opening degree of the throttle element to be updated to the second Preset opening.
  • the above-mentioned reverse cycle defrosting method of the air conditioning system further includes the following steps:
  • the size of the third preset opening B1 is the opening of the corresponding throttle element when the exhaust temperature td1 in the heating process is stable, where the exhaust gas temperature td1 has a value range of: ambient temperature +15°C ⁇ td1 ⁇ ambient temperature+8°C, and, when the exhaust temperature td1 is determined, corresponding to a determined third preset opening B1, and the exhaust temperature td1 fluctuates within the range of values, the third preset opening B1 will also fluctuate accordingly, but the variation range of the flow area of the throttle element caused by the fluctuation of the third preset opening B1 is less than 4% of the flow area; the minimum value of the second preset opening B5 B5 min ⁇ 0.8B1.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than the first preset value; controlling the air-conditioning system to trigger immediately Four-way valve reversal.
  • whether the heating is shut down can be determined according to the air pressure difference between the intake air pressure and the exhaust air pressure, when the air pressure difference between the intake air pressure and the exhaust air pressure is less than a certain value, such as the first preset value, Control the air conditioning system to end the heating, and immediately trigger the four-way valve commutation, where immediate control to trigger the four-way valve commutation is an idealized operation. During actual control, a 3s error is allowed.
  • the first preset value can be set by those skilled in the art according to actual conditions, and is not specifically limited herein.
  • the first preset value may be ⁇ p1, for example, ⁇ p1 is 0.03MPa, when the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system is less than ⁇ p1, the air conditioning system is controlled to end heating, and immediately control the four The valve begins to change direction.
  • ⁇ p1 is 0.03MPa
  • the above-mentioned reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than the second preset value; controlling the air-conditioning system to trigger immediately Enter reverse cycle defrost mode.
  • the embodiments of the present application may also determine whether the four-way valve has completed the commutation according to the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system, and the air pressure difference between the intake air pressure and the exhaust air pressure is less than A certain value, such as the second preset value, indicates that the four-way valve of the air-conditioning system has been switched to the set direction, that is, the switching is over, and the air-conditioning system is immediately controlled to enter the reverse cycle defrosting mode.
  • the second preset value can be set by those skilled in the art according to actual conditions, and is not specifically limited herein.
  • the second preset value may be ⁇ p2, for example, ⁇ p2 is 0.03MPa, when the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system is less than ⁇ p2, the air conditioning system is immediately controlled to enter the reverse cycle defrosting mode .
  • ⁇ p2 is 0.03MPa
  • the values of ⁇ p1 and ⁇ p2 can be in the range of 0.001 to 0.05 MPa and satisfy ⁇ p2 ⁇ 0.8 ⁇ p1. When the size relationship exceeds the value range, the closest value in the range is selected. And when the air conditioning system does not have the conditions for collecting pressure difference, you can control the air conditioning system to stop the 10-way valve immediately after the heating of the air-conditioning system is completed for 10-60s, and the four-way valve in the air conditioning system is switched from the current direction to After setting the direction, stay for 10-60s to control the air-conditioning system to enter the reverse cycle defrosting mode.
  • the above-mentioned staying time is only exemplary and no specific limitation is made.
  • controlling the opening of the throttle element in the air conditioning system to gradually decrease during the reverse cycle defrosting process further includes: obtaining the outlet temperature of the condenser in the air conditioning system; identifying that the outlet temperature is greater than the first setting At a fixed temperature, the air conditioning system is controlled to start adjusting the opening of the throttle element; the outlet temperature is continuously detected to recognize that the outlet temperature is greater than the second set temperature, and the air conditioning system is controlled to immediately end the reverse cycle defrosting.
  • the embodiments of the present application can also adjust the opening of the throttle element according to the outlet temperature of the condenser, for example, the outlet temperature of the condenser in the air conditioning system can be obtained through a temperature sensor, When the outlet temperature of the condenser is greater than a certain value, such as the first set temperature, the opening of the throttle element is adjusted. When the outlet temperature of the condenser is greater than the second set temperature, the air conditioning system is controlled to immediately end the reverse cycle defrosting .
  • the opening of the throttle element is B2. If the outlet temperature of the condenser is greater than tep1 at this time, the opening degree of the throttle element gradually decreases from B2 to B3; and in this stage, the outlet temperature of the condenser is continuously detected. When the outlet temperature of the condenser is greater than tep2, the air conditioning system is controlled to immediately end the reverse cycle defrosting.
  • the opening of the throttle element is adjusted by the outlet temperature of the condenser, so that the opening of the throttle element is adjusted more accurately, and the efficiency of defrosting adjustment is improved.
  • the inlet and outlet of the condenser can be positioned according to the refrigerant flow direction in the refrigeration cycle of the air conditioning system.
  • the value range of tep1 is -1 to 8°C
  • the value range of tep2 is 8 to 14°C, and satisfies tep2>tep1 .
  • the compressor oil pool dissolves a large amount of refrigerant, which leads to a low viscosity, which ensures the normal lubrication and sealing of the mechanical parts.
  • it can avoid the abnormal oil clogging of the throttling element that can occur after the system is turned on and greatly enhanced. The stability and reliability of the operation of the air conditioner system.
  • the above-mentioned reverse cycle defrosting method of the air conditioning system further includes: controlling the air conditioning system to end the reverse cycle defrosting and staying for a third preset duration; controlling the four-way valve in the air conditioning system from the set direction Switch to the current direction and stay for the fourth preset duration; control the air conditioning system to restart heating.
  • the air conditioning system can be controlled to stay for a period of time.
  • the residence time reaches the third preset duration
  • the four-way valve in the air conditioning system is controlled to switch from the set direction to The current direction and control the air conditioning system to stay for a period of time.
  • the stay time reaches the fourth preset duration
  • the air conditioning system is controlled to restart heating.
  • control the air conditioning system to end the reverse cycle defrosting, and stay for 40s, then control the air conditioning system to switch from the set direction to the current direction, and stay again for 40s, then control the air conditioning The system restarts heating.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: controlling the opening of the throttle element to be the second preset opening before defrosting ends; controlling the The flow element is adjusted from the second preset opening degree to the first preset opening degree after the defrosting ends, until the air conditioning system enters the heating mode; wherein, the first preset opening degree is greater than The second preset opening is described.
  • the second preset opening degree B5 is increased to the first preset opening degree B2 to control the air conditioning system to start heating.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than a third preset value; controlling the The air conditioning system immediately triggers the four-way valve reversal.
  • the third preset value may be ⁇ p3.
  • ⁇ p3 is 0.03 MPa.
  • the four-way valve is immediately controlled to start switching.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than a fourth preset value; controlling the The air conditioning system enters the heating mode.
  • the fourth preset value may be ⁇ p4.
  • ⁇ p4 is 0.03 MPa.
  • the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system is less than ⁇ p4, the air conditioning system is immediately controlled to start heating.
  • the values of ⁇ p3 and ⁇ p4 can be in the range of 0.001 to 0.05 MPa and satisfy ⁇ p3> ⁇ p1, ⁇ p4 ⁇ 0.8 ⁇ p3.
  • the closest value in the range is selected.
  • the size of the fourth preset opening B4 is such that the time for the intake pressure to rise to the pressure of the general heating process is the shortest, and the maximum value of the fourth preset opening B4 B4 max ⁇ 3B1.
  • the above-described reverse cycle defrosting method of an air-conditioning system further includes: acquiring the outlet temperature of the condenser in the air-conditioning system; identifying that the outlet temperature is less than the third set temperature, and controlling the air-conditioning system to start adjusting the throttle element The opening of the system; continuously detect the outlet temperature, identify that the outlet temperature is less than the fourth set temperature, and control the air conditioning system to end heating immediately.
  • the heating of the air conditioning system may include two stages: heating from starting to the stage where the heating opening starts to change and heating from the beginning to change to the heating shutdown stage 6-2.
  • the stage 6-1 from the start of heating to the beginning of the change of the heating opening can be judged according to the temperature of the condenser outlet.
  • the third set temperature can be tep3, and control the opening of the throttling element to decrease from the fourth preset opening B4 to the third preset opening B1; it is also possible to determine whether the heating opening has started to change to the heating shutdown stage 6 according to the condenser outlet temperature -2, for example, when the outlet temperature of the condenser is less than the fourth set temperature value, where the fourth set temperature value may be tep4, the air conditioning system is controlled to immediately end heating.
  • the inlet and outlet of the condenser can be positioned according to the refrigerant flow direction in the refrigeration cycle of the air conditioning system.
  • the value range of tep3 is -8 to 2°C, and the value range of tep4 can be -6 to -18°C. tep4 ⁇ tep3.
  • the above-mentioned reverse cycle defrosting method of the air conditioning system further includes: controlling the opening degree of the throttle element to gradually decrease from the fourth preset opening degree to the third preset opening degree after reheating .
  • the opening of the throttle element will be reduced from the fourth preset opening B4 to the third preset opening B1 to ensure the heating effect, thereby greatly Enhanced the stability and reliability of the air conditioner system operation.
  • the opening size of the above-mentioned throttle element is the value in an ideal state, and its actual opening may fluctuate, but the fluctuation range should not exceed 10%;
  • the shutdown of the air conditioning system in this application is controlled by the air conditioning system to stop the compressor , Excluding artificial power-off shutdown behavior; and during heating shutdown to four-way valve reversal phase 1, four-way valve reversal to defrost start-up phase 2, defrost shutdown to four-way valve reversal phase 4 and four-way valve
  • the basis for judging the end of commutation to heating startup stage 5 is not only the pressure difference between the suction air pressure and the exhaust air pressure, but also the duration of each stage is less than or equal to 60s, and when there is no pressure difference acquisition conditions, you can directly take 10- The constant between 60s is used as the basis for ending judgment.
  • the air conditioning system can be controlled to perform reverse cycle defrosting, and the opening of the throttle element in the air conditioning system is gradually reduced during the reverse cycle defrosting process.
  • the opening of the throttle element is continuously reduced through the defrosting process to increase the temperature of the compressor at the end of defrosting, which can effectively prevent the compressor oil sump from dissolving a large amount of refrigerant during the defrosting process, resulting in a low viscosity and ensuring the normal lubrication of mechanical components
  • the exhaust temperature is increased, the oil and gas in the upper casing of the motor are separated more fully, and less lubricating oil is brought to the air conditioning system from the exhaust port, and the defrosting ends
  • the total amount of refrigerant resident in the compressor is reduced, the total amount of refrigerant in the air conditioning system is more and the lubricant is less, which can
  • the reverse cycle defrosting device 10 of the air conditioning system includes a first control module 100 and a second control module 200.
  • the first control module 100 is used to control the air conditioning system to perform reverse cycle defrosting.
  • the second control module 200 is used to control the opening of the throttle element in the air conditioning system to gradually decrease during the reverse cycle defrosting process.
  • the second control module is specifically configured to: obtain the operating duration of the reverse cycle defrosting; according to the operating duration, obtain the opening adjustment amount of the throttling element, according to the opening The degree adjustment amount and the first preset opening degree of the throttle element at the defrosting start time, to obtain the opening degree of the throttle element at the current time.
  • the second control module is further configured to: obtain a product between a running time and a preset adjustment step as the opening adjustment amount.
  • control module obtains the opening degree of the throttle element at the current moment, it is also used to: identify that the opening degree of the throttle element at the current moment is less than the second preset opening degree, and control The opening of the throttle element is updated to the second preset opening.
  • the first control module is specifically configured to: identify that the air conditioning system needs to end heating, control the air conditioning system to end heating and stay for a first preset duration; control the air conditioning system The four-way valve in is switched from the current direction to the set direction and stays for the second preset duration; the air conditioning system is controlled to enter a reverse cycle defrosting mode.
  • the above-described reverse cycle defrosting device of the air-conditioning system further includes: a third control module for controlling the opening of the throttle element to a third preset opening before the end of heating A fourth control module for controlling the throttle element to adjust from the third preset opening degree to the first preset opening degree after the heating is completed, until the air conditioning system enters the defrosting mode; wherein, The first preset opening degree is greater than or equal to the third preset opening degree.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a first identification module for identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system is less than the first A preset value; a fifth control module, configured to control the air conditioning system to continue to stay at the first preset duration and immediately trigger the four-way valve to switch direction.
  • the above-mentioned reverse cycle defrosting device of the air-conditioning system further includes: a second identification module for identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than the second A preset value; a sixth control module, configured to control the air conditioning system to continue to stay in the second preset duration and immediately trigger the entry into the reverse cycle defrosting mode.
  • the second control module is specifically configured to: obtain the outlet temperature of the condenser in the air conditioning system; identify that the outlet temperature is greater than the first set temperature, and control the air conditioning system to start adjustment The opening of the throttle element; continuously detecting the outlet temperature, identifying that the outlet temperature is greater than the second set temperature, and controlling the air conditioning system to immediately end the reverse cycle defrosting.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a seventh control module for controlling the air conditioning system to end the reverse cycle defrosting and stay for a third preset duration; the eighth control A module for controlling the four-way valve in the air conditioning system to switch from the set direction to the current direction, and staying for a fourth preset duration; controlling the air conditioning system to restart heating.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a ninth control module for controlling the opening of the throttle element to be the second preset before the defrosting ends Opening degree; a tenth control module for controlling the throttle element to adjust from the second preset opening degree to the first preset opening degree after defrosting is completed, until the air conditioning system enters heating Mode; wherein, the first preset opening degree is greater than the second preset opening degree.
  • the above-mentioned reverse cycle defrosting device of the air conditioning system further includes: a third identification module for identifying that the air pressure difference between the intake air pressure and the exhaust air pressure of the air conditioning system is less than the third The preset value; the eleventh control module is used to control the air-conditioning system to immediately trigger the four-way valve commutation.
  • the above-described reverse cycle defrosting device of the air-conditioning system further includes: a fourth identification module for identifying that the difference between the intake air pressure and the exhaust air pressure of the air-conditioning system is less than the fourth A preset value; a twelfth control module, used to control the air conditioning system to enter the heating mode.
  • the above-mentioned reverse cycle defrosting device of the air-conditioning system further includes: an acquisition module for acquiring the outlet temperature of the condenser in the air-conditioning system; a thirteenth control module for identifying the When the outlet temperature is less than the third set temperature, the air conditioning system is controlled to start adjusting the opening of the throttle element; the fourteenth control module is used to continuously detect the outlet temperature and identify that the outlet temperature is less than the fourth set temperature Temperature, control the air-conditioning system to end heating immediately.
  • the above-mentioned reverse cycle defrosting device of the air-conditioning system further includes: a fifteenth control module for controlling the opening of the throttle element from the fourth pre-heating after reheating The opening degree is gradually reduced to the third preset opening degree.
  • the first control module may be used to control the air conditioning system to perform reverse cycle defrosting
  • the second control module may be used to control the opening of the throttle element in the air conditioning system to gradually decrease during the reverse cycle defrosting process.
  • the opening of the throttle element is continuously reduced through the defrosting process to increase the temperature of the compressor at the end of defrosting, which can effectively prevent the compressor oil sump from dissolving a large amount of refrigerant during the defrosting process, resulting in a low viscosity and ensuring the normal lubrication of mechanical components
  • the exhaust temperature is increased, the oil and gas in the upper casing of the motor are separated more fully, and less lubricating oil is brought to the air conditioning system from the exhaust port, and the defrosting ends
  • the total amount of refrigerant resident in the compressor is reduced, the total amount of refrigerant in the air conditioning system is more and the lubricant is less, which
  • an embodiment of the present application proposes an air conditioning system 30 that includes the above-described reverse cycle defrosting device 20 of the air conditioning system.
  • the opening of the throttle element is continuously reduced during the defrosting process to increase the temperature of the compressor at the end of defrosting, which can effectively prevent the defrosting process
  • the compressor oil sump dissolves a large amount of refrigerant, which leads to a low viscosity, which guarantees the normal lubrication and sealing of the mechanical parts.
  • the temperature of the exhaust gas is increased due to the reduced opening of the throttle element, and the oil and gas in the upper casing of the motor are separated more fully , Less lubricant is brought to the air conditioning system from the exhaust port, the total amount of refrigerant that resides in the compressor at the end of defrosting is reduced, the total amount of refrigerant in the air conditioning system is more and the lubricant is less.
  • the abnormal oil clogging of the throttle element after the heating is turned on greatly reduces the probability of abnormal clogging of the throttle element, and greatly enhances the stability and reliability of the operation of the air conditioning system.
  • an embodiment of the present application further provides an electronic device 1000, which includes: a memory 1100, a processor 1200, and a computer program stored on the memory 1200 and executable on the processor, and the processor executes the program, In order to realize the above-mentioned reverse cycle defrosting method of the air conditioning system.
  • An embodiment of the present application also proposes a computer-readable storage medium on which a computer program is stored.
  • the program is executed by a processor, the above-described reverse cycle defrosting method of an air-conditioning system is implemented.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be stored in a computer readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, the instructions
  • the device implements the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to produce computer-implemented processing, which is executed on the computer or other programmable device
  • the instructions provide steps for implementing the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

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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 système de climatisation ainsi qu'un procédé et un dispositif de dégivrage par inversion de cycle pour celui-ci. Le procédé comprend les étapes consistant à : commander un système de climatisation pour effectuer un dégivrage par inversion de cycle; et pendant un processus de dégivrage par inversion de cycle, commander un degré d'ouverture d'un élément d'étranglement dans le système de climatisation pour le réduire progressivement. Le procédé de dégivrage par inversion de cycle pour un système de climatisation est utilisé pour commander le degré d'ouverture d'un élément d'étranglement pendant un processus de dégivrage par inversion de cycle, ce qui permet de résoudre le problème selon lequel l'élément d'étranglement fonctionne anormalement lorsqu'il est obstrué par de l'huile lubrifiante. L'invention réduit ainsi la probabilité d'obstruction anormale de l'élément d'étranglement, et améliore la stabilité et la fiabilité du système de climatisation.
PCT/CN2019/128711 2018-12-29 2019-12-26 Système de climatisation, et procédé et dispositif de dégivrage par inversion de cycle pour celui-ci WO2020135589A1 (fr)

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