EP3396262B1 - Procédé et appareil de commande anti-coups de liquide pour système de climatisation et système de climatisation associé - Google Patents

Procédé et appareil de commande anti-coups de liquide pour système de climatisation et système de climatisation associé Download PDF

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Publication number
EP3396262B1
EP3396262B1 EP17870765.9A EP17870765A EP3396262B1 EP 3396262 B1 EP3396262 B1 EP 3396262B1 EP 17870765 A EP17870765 A EP 17870765A EP 3396262 B1 EP3396262 B1 EP 3396262B1
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EP
European Patent Office
Prior art keywords
conditioning system
time period
air conditioning
superheat degree
compressor
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EP17870765.9A
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German (de)
English (en)
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EP3396262A4 (fr
EP3396262A1 (fr
Inventor
Weimin Xie
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Priority claimed from CN201611034105.4A external-priority patent/CN106766444B/zh
Priority claimed from CN201611027983.3A external-priority patent/CN106403429B/zh
Application filed by Midea Group Co Ltd, GD Midea Heating and Ventilating Equipment Co Ltd filed Critical Midea Group Co Ltd
Publication of EP3396262A1 publication Critical patent/EP3396262A1/fr
Publication of EP3396262A4 publication Critical patent/EP3396262A4/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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/022—Compressor control 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
    • F25B2500/00—Problems to be solved
    • F25B2500/06—Damage
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/08—Exceeding a certain temperature value in a refrigeration component or cycle
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
    • 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
    • F25B2600/00—Control issues
    • F25B2600/01—Timing
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B2600/00—Control issues
    • F25B2600/23—Time delays
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2116—Temperatures of a condenser
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2117—Temperatures of an evaporator

Definitions

  • the present invention relates to the field of air conditioner technology, and more particularly to a control method of anti-liquid-slugging of air conditioning system and a control device of anti-liquid-slugging of air conditioning system, and an air conditioning system.
  • suction superheat degree of the air conditioning system is general monitored in real time, thereby preventing that the liquid refrigerant enters into the compressor and avoiding that the compressor is suffered from the liquid-slugging.
  • the value of the suction superheat degree of the air conditioning system is relatively small, which is not easy to be detected and controlled. Therefore, an accuracy of anti-liquid-slugging control of the compressor is relatively low and reliability is poor.
  • JP2009-109126A discloses a control method according to the preamble of claim 1 and a control device according to the preamble of claim 7.
  • a superheating degree operating means operates a superheating degree and a superheating degree of discharging operating means operates the superheating degree of discharging respectively.
  • a valve opening degree control mode table sets the control contents (a value of valve travel and the like) of a variable pressure reducing device.
  • a valve travel control mode deciding means decides the value of valve travel capable of obtaining the optimum superheating degree or the optimum superheating degree of discharging from the valve travel control mode table in accordance with the operating frequency detected by a compressor operating frequency detecting means. In this case, respective values of the valve travel control table are set by the values of experiments.
  • WO2016/107202A1 relates to a refrigerant control method for a multi-split machine connected in series, comprising: in a heating mode, comparing the superheat degree of each outdoor unit with the average superheat degree of multiple outdoor units; if the superheat degree of the present outdoor unit is too high relative to the average superheat degree, increasing the refrigerant amount into the present outdoor unit; and if the superheat degree of the present outdoor unit is too low relative to the average superheat degree, decreasing the refrigerant amount into the present outdoor unit.
  • CN105485992A relates to a refrigerant shortage detecting method of an air conditioning system comprising the steps of: detecting air return pressure of a compressor, and obtaining a corresponding evaporation saturation temperature according to the air return pressure of the compressor; obtaining an inlet superheat degree of a liquid storage tank, an air return superheat degree of the compressor and an exhaust superheat degree of the compressor; and judging that the air conditioning system generates the refrigerant shortage condition when the evaporation saturation temperature is lower than a preset value if the inlet superheat degree of the liquid storage tank is higher than and equal to a first preset superheat degree, the air return superheat degree of the compressor is higher than and equal to a second preset superheat degree and the exhaust superheat degree of the compressor is higher than and equal to a third preset superheat degree.
  • US2015/204592A1 relates to an air-conditioning apparatus including an outdoor unit with a compressor, an outdoor heat exchange, a four-way valve for switching a refrigerant flow passage, and an outdoor flow control valve which controls the flow rate of a liquid refrigerant; and an indoor unit that includes an indoor heat exchanger, and an indoor flow control valve which reduces refrigerant pressure.
  • a refrigerant circuit is formed by connecting the outdoor unit and at least one indoor unit by a pipe.
  • a controller controls a component of the refrigerant circuit, based on the relationship between a first target set temperature used for temperature control of air to be conditioned and a preset second target set temperature.
  • Embodiments of the present invention seek to solve at least one of the problems existing in the related art to at least some extent.
  • embodiments of a first aspect of the present invention provide a control method according to independent claim 1 of anti-liquid-slugging of air conditioning system.
  • the control method includes acquiring a discharge superheat degree of a compressor in real time, monitoring the discharge superheat degree during an operating process of the air conditioning system; when the discharge superheat degree is less than a first preset value for a first preset time period, controlling a timer to start timing; and when a counted time period of the timer reaches a second preset time period, controlling an outdoor unit of the air conditioning system to shut down for preventing the compressor from the liquid-slugging.
  • the discharge superheat degree is greater than or equal to the first preset value for a third preset time period, resetting the timer and continuing to determine whether the discharge superheat degree satisfies a condition that the timer starts timing.
  • the control method further includes determining whether a number of anti-liquid-slugging protection activated by the air conditioning system during a fourth preset time period exceeds a preset number, while the number of the anti-liquid-slugging protection activated by the air conditioning system during the fourth preset time period exceeds the preset number, controlling the outdoor unit to be unrecoverable without being powered off; and while the number of the anti-liquid-slugging protection activated by the air conditioning system during the fourth preset time period does not exceed the preset number, resetting the timer, and controlling the outdoor unit to restart after a fifth preset time period.
  • the air conditioning system includes the compressor, a condenser and an evaporator, and acquiring the discharge superheat degree of the compressor in real time includes: detecting temperature of a gas outlet of the compressor, and detecting temperature of a middle part of the condenser and temperature of a middle part of the evaporator; when the air conditioning system is in a refrigerating mode, calculating the discharge superheat degree of the compressor according to the temperature of the gas outlet and the temperature of the middle part of the condenser; and when the air conditioning system is in a heating mode, calculating the discharge superheat degree of the compressor according to the temperature of the gas outlet and the temperature of the middle part of the evaporator.
  • acquiring the discharge superheat degree of the compressor in real time includes: detecting a pressure of a gas outlet of the compressor and detecting temperature of the gas outlet of the compressor; and calculating the discharge superheat degree of the compressor according to the pressure of the gas outlet and the temperature of the outlet.
  • the first preset time period may be 20 minutes
  • the second preset time period may be 30 minutes
  • the third preset time period may be 5 minutes
  • the fourth preset time period may be 120 minutes
  • the fifth preset time period may be 6 minutes.
  • the timer is controlled to start timing when the discharge superheat degree is less than the first preset value for the first preset time period; and the outdoor unit of the air conditioning system is controlled to shut down for preventing the compressor from the liquid-slugging when the counted time period of the timer reaches the second preset time period.
  • the control method of anti-liquid-slugging of air conditioning system may realize anti-liquid-slugging protection by monitoring the discharge superheat degree of the compressor in real time, such that it may be ensured that refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • embodiments of a second aspect of the present invention provide a non-transitory computer readable storage medium according to independent claim 6, the storage medium having computer programs stored thereon.
  • the control method of anti-liquid-slugging of air conditioning system according to embodiments of the first aspect is realized.
  • control device includes: an acquiring module, configured to acquire a discharge superheat degree of a compressor in real time; a monitoring module, configured to monitor the discharge superheat degree during an operating process of the air conditioning system; and a control module, configured to, when the discharge superheat degree is less than a first preset value for a first preset time period, control a timer to start timing; and when a counted time period of the timer reaches a second preset time period, control an outdoor unit of the air conditioning system to shut down for preventing the compressor from the liquid-slugging.
  • the control module is configured to reset the timer and continue to determine whether the discharge superheat degree satisfies a condition that the timer starts timing.
  • the control module is further configured to determine, whether a number of anti-liquid-slugging protection activated by the air conditioning system during a fourth preset time period exceeds a preset number, while the number of the anti-liquid-slugging protection activated by the air conditioning system during the fourth preset time period exceeds the preset number, the control module is configured to control the outdoor unit to be unrecoverable without being powered off; and while the number of the anti-liquid-slugging protection activated by the air conditioning system during the fourth preset time period does not exceed the preset number, the control module is configured to reset the timer, and control the outdoor unit to restart after a fifth preset time period.
  • the air conditioning system includes the compressor, a condenser and an evaporator
  • the control device further includes: a first temperature sensor arranged at a gas outlet of the compressor and configured to detect temperature of the gas outlet of the compressor; a second temperature sensor arranged at a middle part of the condenser and configured to detect temperature of the middle part of the condenser; and a third temperature sensor arranged at a middle part of the evaporator and configured to detect temperature of the middle part of the evaporator;
  • the acquiring module is further configured to calculate the discharge superheat degree of the compressor according to the temperature of the gas outlet and the temperature of the middle part of the condenser when the air conditioning system is in a refrigerating mode; and to calculate the discharge superheat degree of the compressor according to the temperature of the gas outlet and the temperature of the middle part of the evaporator when the air conditioning system is in a heating mode.
  • control device further includes a temperature sensor and a pressure sensor arranged at an gas outlet of the compressor, the temperature sensor is configured to detect temperature of the gas outlet of the compressor and the pressure sensor is configured to detect pressure of the gas outlet of the compressor, and the acquiring module is configured to calculate the discharge superheat degree of the compressor according to the temperature of the gas outlet and the pressure of the gas outlet.
  • the first preset time period may be 20 minutes
  • the second preset time period may be 30 minutes
  • the third preset time period may be 5 minutes
  • the fourth preset time period may be 120 minutes
  • the fifth preset time period may be 6 minutes.
  • control module is configured to control the timer to start timing when the discharge superheat degree is less than the first preset value for the first preset time period; and the control module is configured to control the outdoor unit of the air conditioning system to shut down for preventing the compressor from the liquid-slugging when the counted time period of the timer reaches the second preset time period.
  • the control device of anti-liquid-slugging of air conditioning system may realize anti-liquid-slugging protection by monitoring the discharge superheat degree of the compressor in real time, such that it may be ensured that refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of the anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • embodiments of a fourth aspect of the present ⁇ invention provide an air conditioning system according to dependent claim 12.
  • the air conditioning system includes the control device of anti-liquid-slugging of air conditioning system according to above embodiments.
  • an anti-liquid-slugging protection is realized by monitoring the discharge superheat degree of the compressor in real time with the above control device of anti- liquid-slugging of air conditioning system, such that it may be ensured that refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • Fig. 1 is a flow chart illustrating a control method of anti-liquid-slugging of air conditioning system according to an embodiment of the present invention. As illustrated in Fig. 1 , the control method of anti-liquid-slugging of air conditioning system includes the followings.
  • discharge superheat degree DSH of a compressor is acquired in real time, and the discharge superheat degree DSH is monitored during an operating process of an air conditioning system.
  • acquiring the discharge superheat degree DSH of the compressor in real time includes the following. Pressure P of a gas outlet of the compressor is detected, and temperature Tc of the gas outlet of the compressor is detected. The discharge superheat degree DSH of the compressor is calculated according to the pressure P of the gas outlet and the temperature Tc of the gas outlet.
  • a pressure vs enthalpy diagram illustrated in Fig. 2 may be obtained.
  • a longitudinal coordinate represents a logarithm value LogP of an absolute pressure of the air conditioning system
  • a horizontal coordinate represents a specific enthalpy value b of the air conditioning system.
  • the air conditioning system is in a superheat and exothermic phase indicated by segments 1-2, where gaseous refrigerant with high temperature and high pressure is exhausted from the gas outlet of the compressor.
  • the air conditioning system is in a constant pressure and exothermic phase indicated by segments 2-4.
  • the air conditioning system is in a constant pressure and endothermic phase indicated by segments 5-6.
  • the air conditioning system is in a superheat and endothermic phase indicated by segments 6-7, where the refrigerant is sucked back through an gas inlet of the compressor.
  • the discharge superheat degree DSH of the air conditioning system corresponds to the suction superheat degree SSH, and the value of the discharge superheat degree DSH is greater than the value of the suction superheat degree SSH. Therefore, when the discharge superheat degree DSH is within a predetermined range, it may be ensured that the refrigerant sucked back through the gas inlet of the compressor is gaseous.
  • an acquiring module may be configured to acquire drain saturation temperature Tp according to the pressure P of the gas outlet of the compressor detected in real time, and to calculate a difference between the temperature Tc of the gas outlet and the drain saturation temperature Tp as real-time discharge superheat degree DSH. Therefore, the real-time discharge superheat degree DSH may be used for anti-liquid-slugging control.
  • the first preset time period t1 may be 20 minutes
  • the second preset time period t2 may be 30 minutes
  • the first preset value M1 may be A °C.
  • the discharge superheat degree DSH of the compressor is acquired in real time, and the discharge superheat degree DSH is monitored during the operating process of the air conditioning system to determine whether the discharge superheat degree DSH of the air conditioning system is greater than or equal to the first preset value M1.
  • the discharge superheat degree DSH is greater than or equal to the first preset value M1 (such as A°C)
  • M1 such as A°C
  • a suction superheat degree SSH of the air conditioning system is sufficiently large, such that the outdoor unit of the air conditioning system is controlled to operate normally.
  • the refrigerant sucked back through the gas inlet of the compressor is gaseous.
  • the discharge superheat degree DSH is less than the first preset value M1
  • the duration reaches the first preset time period t1, the timer is controlled to start timing.
  • the outdoor unit of the air conditioning system is controlled to shut down for preventing liquid refrigerant from being sucked back through the gas inlet of the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the timer is reset and the control method continues to determine whether the discharge superheat degree satisfies a condition that the timer starts timing.
  • the third preset time period t3 may be 5 minutes.
  • the discharge superheat degree DSH is monitored in real time.
  • the first preset value M1 such as A°C
  • the discharge superheat degree DSH is greater than or equal to the first preset value M1 (such as A°C) for the third preset time period t3
  • the timer is reset and it is determined again whether the discharge superheat degree DSH satisfies the condition that the timer starts timing.
  • a number N of anti-liquid-slugging protection activated by the air conditioning system during a fourth preset time period t4 exceeds a preset number (such as one). While the number N of the anti-liquid-slugging protection activated by the air conditioning system during the fourth preset time period t4 exceeds the preset number (such as one), the outdoor unit is controlled to be unrecoverable without being powered off. While the number N of the anti-liquid-slugging protection activated by the air conditioning system during the fourth preset time period t4 does not exceed the preset number (such as one), the timer is reset, and the outdoor unit is controlled to restart after a fifth preset time period.
  • a preset number such as one
  • the fourth preset time period t4 may be 120 minutes and the fifth preset time period may be 6 minutes.
  • the number N of the anti-liquid-slugging protection activated by the air conditioning system may be counted by a counter. While the number N of the anti-liquid-slugging protection activated by the air conditioning system during the fourth preset time period t4 (such as 120 minutes) exceeds the preset number (such as one), it is indicated that the suction superheat degree SSH of the air conditioning system keeps continuously relatively low, such that the outdoor unit is controlled to be unrecoverable without being powered off. That is, after the outdoor unit is powered off, the outdoor unit can be recoverably started.
  • the timer is reset and the outdoor unit is automatically controlled to restart after the fifth preset time period t5 (such as 6 minutes), and it is determined again whether the discharge superheat degree DSH satisfies the condition that the timer starts timing.
  • control method of anti- liquid-slugging of air conditioning system may specifically include the following.
  • the discharge superheat degree DSH of the compressor is acquired in real time and the discharge superheat degree DSH is monitored during the operating process of the air conditioning system.
  • a block S104 is executed. If no, a block S105 is executed.
  • the timer is controlled to start timing.
  • a block S108 is executed. If no, a block S110 is executed.
  • a block S113 is executed. If no, a block S114 is executed.
  • the outdoor unit is controlled to be unrecoverable without being powered off.
  • the timer is controlled to start timing when the discharge superheat degree is less than the first preset value for the first preset time period; and the outdoor unit of the air conditioning system is controlled to shut down for preventing the compressor from the liquid-slugging when the counted time period of the timer reaches the second preset time period.
  • the control method of anti-liquid-slugging of air conditioning system may realize anti-liquid-slugging protection by monitoring the discharge superheat degree of the compressor in real time, such that it may be ensured that refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • Fig. 3 is a flow chart illustrating a control method of anti-liquid-slugging of air conditioning system according to another embodiment of the present invention.
  • the air conditioning system includes the compressor, a condenser and an evaporator.
  • the control method of anti-liquid-slugging of air conditioning system includes the followings.
  • temperature Tc of a gas outlet of the compressor is detected and temperature T1 of a middle part of the condenser and temperature T2 of a middle part of the evaporator are detected.
  • the discharge superheat degree DSH of the compressor is calculated according to the temperature Tc of the gas outlet and the temperature T1 of the middle part of the condenser.
  • the discharge superheat degree DSH of the compressor is calculated according to the temperature Tc of the gas outlet and the temperature T2 of the middle part of the evaporator.
  • a pressure vs enthalpy diagram illustrated in Fig. 2 may be obtained.
  • a longitudinal coordinate represent a logarithm value LogP of an absolute pressure of the air conditioning system
  • a horizontal coordinate represents a specific enthalpy value b of the air conditioning system.
  • the air conditioning system is in a superheat and exothermic phase indicated by segments 1-2, where gaseous refrigerant with high temperature and high pressure is exhausted from the gas outlet of the compressor.
  • the air conditioning system is in a constant pressure and exothermic phase indicated by segments 2-4.
  • the air conditioning system is in a constant pressure and endothermic phase indicated by segments 5-6.
  • the air conditioning system is in a superheat and endothermic phase indicated by segments 6-7, where the refrigerant is sucked back through a gas inlet of the compressor.
  • the discharge superheat degree DSH of the air conditioning system corresponds to the suction superheat degree SSH, and the value of the discharge superheat degree DSH is greater than the value of the suction superheat degree SSH. Therefore, when the discharge superheat degree DSH is within a predetermined range, it may be ensured that the refrigerant sucked back through the gas inlet of the compressor is gaseous.
  • the temperature Tc of the gas outlet of the compressor is detected in real time, and the temperature T1 of the middle part of the condenser and the temperature T2 of the middle part of the evaporator are detected.
  • the temperature T1 of the middle part of the condenser is equivalent to saturation temperature at a high pressure side of the air conditioning system. That is, the temperature T1 of the middle part of the condenser may be determined as drain saturation temperature. Therefore, the discharge superheat degree DSH of the compressor may be nearly represented as a difference (Tc-T1) between the temperature Tc of the gas outlet of the compressor and the temperature T1 of the middle part of the condenser.
  • the temperature T2 of the middle part of the evaporator is equivalent to the saturation temperature at the high pressure side of the air conditioning system. That is, the temperature T2 of the middle part of the evaporator may be determined as the drain saturation temperature. Therefore, the discharge superheat degree DSH of the compressor may be nearly represented as a difference (Tc-T2) between the temperature Tc of the gas outlet of the compressor and the temperature T2 of the middle part of the evaporator. Further, the real-time discharge superheat degree DSH may be used for anti-liquid-slugging control.
  • the first preset time period t1 may be 20 minutes
  • the second preset time period t2 may be 30 minutes
  • the first preset value M1 may be A °C.
  • the discharge superheat degree DSH of the compressor is acquired in real time, and the discharge superheat degree DSH is monitored during the operating process of the air conditioning system to determine whether the discharge superheat degree DSH of the air conditioning system is greater than or equal to the first preset value M1.
  • the discharge superheat degree DSH is greater than or equal to the first preset value M1 (such as A°C)
  • M1 such as A°C
  • the discharge superheat degree DSH is less than the first preset value M1
  • the duration reaches the first preset time period t1, the timer is controlled to start timing.
  • the outdoor unit of the air conditioning system is controlled to shut down for preventing liquid refrigerant from being sucked back through the gas inlet of the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the timer is reset, and the control method continues to determine whether the discharge superheat degree DSH satisfies a condition that the timer starts timing.
  • the third preset time period t3 may be 5 minutes.
  • the discharge superheat degree DSH is monitored in real time.
  • the first preset value M1 such as A °C
  • the timer is reset and it is determined again whether the discharge superheat degree DSH satisfies the condition that the timer starts timing.
  • a number N of anti-liquid-slugging activated by the air conditioning system during a fourth preset time period t4 exceeds a preset number (such as one). While the number N of the anti-liquid-slugging activated by the air conditioning system during the fourth preset time period t4 exceeds the preset number (such as one), the outdoor unit is controlled to be unrecoverable without being powered off. While the number N of the anti-liquid-slugging activated by the air conditioning system during the fourth preset time period t4 does not exceed the preset number (such as one), the timer is reset and the outdoor unit is controlled to restart after a fifth preset time period t5.
  • the fourth preset time period t4 may be 120 minutes
  • the fifth preset time period t5 may be 6 minutes.
  • the number N of the anti-liquid-slugging activated by the air conditioning system may be counted via a counter. While the number N of the anti-liquid-slugging activated by the air conditioning system during the fourth preset time period t4 (such as 120 minutes) exceeds the preset number (such as one), it is indicated that the suction superheat degree SSH of the air conditioning system keeps continuously relatively low, such that the outdoor unit is unrecoverable without being powered off. That is, after the outdoor unit is powered off, the outdoor unit can be recoverably started.
  • the timer is reset and the outdoor unit is automatically controlled to restart after the fifth preset time period t5 (such as 6 minutes).
  • the discharge superheat degree DSH satisfies the condition that the timer starts timing.
  • control method of anti- liquid-slugging of air conditioning system may specifically include the following.
  • the discharge superheat degree DSH of the compressor is acquired in real time and the discharge superheat degree DSH is monitored during the operating process of the air conditioning system.
  • a block S104 is executed. If no, a block S105 is executed.
  • the timer is controlled to start timing.
  • a block S108 is executed. If no, a block S110 is executed.
  • a block S113 is executed. If no, a block S114 is executed.
  • the outdoor unit is controlled to be unrecoverable without being powered off.
  • the discharge superheat degree of the compressor is calculated according to the temperature of the gas outlet and the temperature of the middle part of the condenser, and when the air conditioning system is in the heating mode, the discharge superheat degree of the compressor is calculated according to the temperature of the gas outlet and the temperature of the middle part of the evaporator, by monitoring the discharge superheat degree during the operating process of the air conditioning system, the timer is controlled to start timing when the discharge superheat degree is less than the first preset value for the first preset time period; and the outdoor unit of the air conditioning system is controlled to shut down for preventing the compressor from the liquid-slugging when the counted time period of the timer reaches the second preset
  • the control method of anti-liquid-slugging of air conditioning system may realize anti-liquid-slugging protection by monitoring the discharge superheat degree of the compressor in real time, such that it may be ensured that the refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • Embodiments of the present invention further provide a non-transitory computer readable storage medium, having computer programs stored thereon.
  • the computer programs are executed by a processor, the control method of anti-liquid-slugging of air conditioning system according to embodiments of the present invention is realized.
  • Fig. 5 is a block diagram illustrating a control device of anti-liquid-slugging of air conditioning system according to an embodiment of the present invention.
  • the control device includes an acquiring module 10, a monitoring module 20 and a control module 30.
  • the acquiring module 10 is configured to acquire a discharge superheat degree DSH of a compressor in real time.
  • the monitoring module 20 is configured to monitor the discharge superheat degree during an operating process of the air conditioning system.
  • the control module 30 is configured to control a timer 60 to start timing when the discharge superheat degree is less than a first preset value M1 for a first preset time period t1, and to control an outdoor unit of the air conditioning system to shut down for preventing the compressor from the liquid-slugging when a counted time period of the timer 60 reaches a second preset time period t2.
  • the first preset time period t1 may be 20 minutes
  • the second preset time period t2 may be 30 minutes
  • the first preset value M1 may be A °C.
  • the acquiring module 10 is configured to acquire the discharge superheat degree DSH of the compressor in real time
  • the monitoring module 20 is configured to monitor the discharge superheat degree DSH during the operating process of the air conditioning system, and to determine whether the discharge superheat degree DSH of the air conditioning system is greater than or equal to the first preset value M1.
  • the discharge superheat degree DSH is greater than or equal to the first preset value M1 (such as A°C)
  • M1 such as A°C
  • the control module 30 controls the outdoor unit of the air conditioning system to keep operating normally. Refrigerant sucked back through a gas inlet of the compressor is gaseous.
  • the control module 30 is configured to further determine whether a duration reaches the first preset time period t1 (such as 20 minutes). When the duration reaches the first preset time period t1, the control module 30 is configured to control the timer 60 to start timing.
  • a duration reaches the first preset time period t1 (such as 20 minutes).
  • control module 30 is configured to determine whether a counted time period t of the timer 60 reaches the second preset time period t2 (such as 30 minutes). When the counted time period t of the timer 60 reaches the second preset time period t2, that is the duration when the discharge superheat degree DSH is less than the first preset value M1 reaches the second preset time period t2, the suction superheat degree SSH of the air conditioning system is accordingly relatively low, the control module 30 is configured to control the outdoor unit of the air conditioning system to shut down for preventing liquid refrigerant from being sucked back through the gas inlet of the compressor, and avoiding the compressor being suffered from the liquid-slugging.
  • the second preset time period t2 such as 30 minutes.
  • the control device of anti-liquid-slugging of air conditioning system further includes a fourth temperature sensor 40 and a pressure sensor 50 arranged at the gas outlet of the compressor.
  • the fourth temperature sensor 40 is configured to detect temperature Tc of the gas outlet of the compressor
  • the pressure sensor 50 is configured to detect pressure P of the outlet of the compressor.
  • the acquiring module 10 is configured to calculate the discharge superheat degree DSH of the compressor according to the pressure P of the gas outlet and the temperature Tc of the gas outlet.
  • the fourth temperature sensor 40 may be a drain temperature sensing bulb.
  • a pressure vs enthalpy diagram illustrated in Fig. 2 may be obtained.
  • a longitudinal coordinate represents a logarithm value LogP of an absolute pressure of the air conditioning system
  • a horizontal coordinate represents a specific enthalpy value b of the air conditioning system.
  • the air conditioning system is in a superheat and exothermic phase indicated by segments 1-2, where gaseous refrigerant with high temperature and high pressure is exhausted from the gas outlet of the compressor.
  • the air conditioning system is in a constant pressure and exothermic phase indicated by segments 2-4.
  • the air conditioning system is in a constant pressure and endothermic phase indicated by segments 5-6.
  • the air conditioning system is in a superheat and endothermic phase indicated by segments 6-7, where the refrigerant is sucked back through the gas inlet of the compressor.
  • the discharge superheat degree DSH of the air conditioning system corresponds to the suction superheat degree SSH, and the value of the discharge superheat degree DSH is greater than the value of the suction superheat degree SSH. Therefore, when the discharge superheat degree DSH is within a predetermined range, it may be ensured that the refrigerant sucked back through the gas inlet of the compressor is gaseous.
  • the acquiring module may be configured to acquire drain saturation temperature Tp according to the pressure P of the gas outlet of the compressor detected in real time, and to calculate a difference between the temperature Tc of the gas outlet and the drain saturation temperature Tp as real-time discharge superheat degree DSH. Therefore, the real-time discharge superheat degree DSH may be used for anti-liquid-slugging control.
  • the control module 30 is configured to reset the timer 60 and continue to determine whether the discharge superheat degree DSH satisfies a condition that the timer 60 starts timing.
  • the third preset time period t3 may be 5 minutes.
  • the monitoring module 20 is configured to monitor the discharge superheat degree DSH in real time.
  • the control module 30 is configured to further determine whether a duration reaches the third preset time period t3 (such as 5 minutes).
  • the control module 30 is configured to reset the timer 60 and determine again whether the discharge superheat degree DSH satisfies the condition that the timer 60 starts timing.
  • the control module 30 is configured to further determine whether a number N of anti-liquid-slugging activated by the air conditioning system during a fourth preset time period t4 exceeds a preset number (such as one). While the number N of the anti-liquid-slugging activated by the air conditioning system during the fourth preset time period t4 exceeds the preset number (such as one), the control module 30 is configured to control the outdoor unit to be unrecoverable without being powered off.
  • control module 30 is configured to reset the timer 60 and control the outdoor unit to restart after a fifth preset time period t5.
  • the fourth preset time period t4 may be 120 minutes and the fifth preset time period t5 may be 6 minutes.
  • the number N of the anti-liquid-slugging activated by the air conditioning system may be counted via a counter. While the number N of the anti-liquid-slugging activated by the air conditioning system during the fourth preset time period t4 exceeds the preset number (such as one), it is indicated that the suction superheat degree SSH of the air conditioning system keeps continuously relatively low.
  • the control module 30 is configured to control the outdoor unit to be unrecoverable without being powered off. That is, after the outdoor unit is powered off, the outdoor unit can be recoverably started.
  • the control module 30 is configured to reset the timer and automatically control the outdoor unit to restart after the fifth preset time period t5 (such as 6 minutes), and determine again whether the discharge superheat degree DSH satisfies the condition that the timer 60 starts timing.
  • the control module by acquiring the discharge superheat degree of the compressor in real time with the acquiring module, and by monitoring the discharge superheat degree with the monitoring module during the operating process of the air conditioning system, the control module is configured to control the timer to start timing when the discharge superheat degree is less than the first preset value for the first preset time period; and the control module is configured to control the outdoor unit of the air conditioning system to shut down for preventing the compressor from the liquid-slugging when the counted time period of the timer reaches the second preset time period.
  • the control device of anti-liquid-slugging of air conditioning system may realize anti-liquid-slugging protection by monitoring the discharge superheat degree of the compressor in real time, such that it may be ensured that refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • Fig. 7 is a block diagram illustrating a control device of anti-liquid-slugging of air conditioning system according to another embodiment of the present invention.
  • the control device includes a first temperature sensor 70, a second temperature sensor 80, a third temperature sensor 90 and the acquiring module 10 (i.e., the calculating module 11 in embodiments illustrated in Fig. 7 ), the monitoring module 20 and the control module 30.
  • the first temperature sensor 70 is arranged at the gas outlet of the compressor 100.
  • the first temperature sensor 70 is configured to detect temperature Tc of the gas outlet of the compressor 10.
  • the second temperature sensor 80 is arranged at a middle part of the evaporator 200, and the second temperature sensor 80 is configured to detect temperature T1 of the middle part of the evaporator 200.
  • the third temperature sensor 90 is arranged at a middle part of the condenser 300, and the third temperature sensor 90 is configured to detect temperature T2 of the middle part of the condenser 300.
  • the acquiring module 10 (i.e., the calculating module 11) is configured to, when the air conditioning system is in a refrigerating mode, calculate the discharge superheat degree DSH of the compressor 100 according to the temperature Tc of the gas outlet and the temperature T2 of the middle part of the condenser 300, and when the air conditioning system is in a heating mode, calculate the discharge superheat degree DSH of the compressor 100 according to the temperature Tc of the gas outlet and the temperature T1 of the middle part of the evaporator 200.
  • the monitoring module 20 is configured to monitor the discharge superheat degree DSH during the operating process of the air conditioning system.
  • the control module 30 is configured to control the timer 60 to start timing when the discharge superheat degree DSH is less than the first preset value M1 for the first preset time period t1, and control the outdoor unit of the air conditioning system to shut down for preventing the compressor from the liquid-slugging when the counted time period t of the timer 60 reaches the second preset time period t2.
  • the first preset time period t1 may be 20 minutes
  • the second preset time period t2 may be 30 minutes
  • the first preset value M1 may be A °C.
  • the first temperature sensor 70 is configured to detect the temperature Tc of the gas outlet of compressor 100 in real time
  • the second temperature sensor 80 is configured to detect the temperature T1 of the middle part of the condenser 300 in real time
  • the third temperature sensor 90 is configured to detect the temperature T2 of the evaporator 200 in real time.
  • the temperature T1 of the middle part of the condenser 300 is equivalent to saturation temperature at a high pressure side of the air conditioning system. That is, the temperature T1 of the middle part of the condenser 300 may be determined as drain saturation temperature.
  • the discharge superheat degree DSH of the compressor 100 may be nearly represented as a difference (Tc-T1) between the temperature Tc of the gas outlet of the compressor 100 and the temperature T1 of the middle part of the condenser 300.
  • Tc-T1 the temperature T2 of the middle part of the evaporator 200 is equivalent to the saturation temperature at the high pressure side of the air conditioning system. That is, the temperature T2 of the middle part of the evaporator 200 may be determined as the drain saturation temperature.
  • the discharge superheat degree DSH of the compressor 100 may be nearly represented as a difference (Tc-T2) between the temperature Tc of the gas outlet of the compressor 100 and the temperature T2 of the middle part of the evaporator 200.
  • the real-time discharge superheat degree DSH may be used for anti-liquid-slugging control.
  • the calculating module 11 when the air conditioning system is in the refrigerating mode, the calculating module 11 is configured to calculate the discharge superheat degree DSH of the compressor 100 according to the temperature Tc of the gas outlet of the compressor 100 and the temperature T1 of the middle part of the condenser 300.
  • the calculating module 11 is configured to calculate the discharge superheat degree DSH of the compressor 100 according to the temperature Tc of the outlet of the compressor 100 and the temperature T2 of the middle part of the evaporator 200.
  • the monitoring module 20 is configured to monitor the discharge superheat degree DSH during the operating process of the air conditioning system, and determine whether the discharge superheat degree DSH of the air conditioning system is greater than or equal to the first preset value M1.
  • the control module 30 is configured to control the outdoor unit of the air conditioning system to keep operating normally. The refrigerant sucked back through the gas inlet of the compressor 100 is gaseous.
  • the control module 30 is configured to further determine whether a duration reaches the first preset time period t1 (such as 20 minutes). When the duration reaches the first preset time period t1, the control module 30 is configured to control the timer 60 to start timing.
  • control module 30 is configured to determine whether the counted time period t of the timer 60 reaches the second preset time period t2 (such as 30 minutes).
  • the control module 30 is configured to control the outdoor unit of the air conditioning system to shut down for preventing liquid refrigerant from being sucked back through the gas inlet of the compressor 100 and avoiding the compressor 100 being suffered from the liquid-slugging.
  • the control module 30 is configured to reset the timer 60 and continue to determine whether the discharge superheat degree DSH satisfies the condition that the timer 60 starts timing.
  • the third preset time period t3 may be 5 minutes.
  • the monitoring module 20 is configured to monitor the discharge superheat degree DSH in real time.
  • the control module 30 may be configured to further determine whether a duration reaches the third preset time period t3 (such as 5 minutes).
  • the control module 30 is configured to reset the timer 60 and to determine again whether the discharge superheat degree DSH satisfies the condition that the timer 60 starts timing.
  • the control module 30 is further configured to determine whether a number N of anti-liquid-slugging activated by the air conditioning system during a fourth preset time period t4 exceeds a preset number (such as two). While the number N of the anti-liquid-slugging activated by the air conditioning system during the fourth preset time period t4 exceeds the preset number (such as two), the control module 30 is configured to control the outdoor unit to be unrecoverable without being powered off.
  • control module 30 is configured to reset the timer 60 and control the outdoor unit to restart after a fifth preset time period t5.
  • the fourth preset time period t4 may be 120 minutes
  • the fifth preset time period t5 may be 6 minutes.
  • the number N of the anti-liquid-slugging activated by the air conditioning system may be counted by a counter. While the number N of the anti-liquid-slugging activated by the air conditioning system during the fourth preset time period t4 (such as 120 minutes) exceeds the preset number (such as one), it is indicated that the suction superheat degree SSH of the air conditioning system keeps continuously relatively low.
  • the control module 30 is configured to control the outdoor unit to be unrecoverable without being powered off. That is, it is required to power the outdoor unit off, and the outdoor unit can be recoverably started.
  • the control module 30 is configured to reset the timer 60 and automatically control the outdoor unit to restart after the fifth preset time period t5 (such as 6 minutes), and determine again whether the discharge superheat degree DSH satisfies the condition that the timer 60 starts timing.
  • the discharge superheat degree of the compressor is calculated via the calculating module according to the temperature of the gas outlet and the temperature of the middle part of the condenser when the air conditioning system is in the refrigerating mode and the discharge superheat degree of the compressor is calculated via the calculating module according to the temperature of the gas outlet and the temperature of the middle part of the evaporator when the air conditioning system is in the heating mode.
  • the monitoring module 20 is configured to monitor the discharge superheat degree during the operating process of the air conditioning system.
  • the control module is configured to control the timer to start timing when the discharge superheat degree is less than the first preset value for the first preset time period, and to control the outdoor unit of the air conditioning system to shut down when the counted time period of the timer reaches the second preset time period.
  • control device of anti-liquid-slugging of air conditioning system may realize anti-liquid-slugging protection by monitoring the discharge superheat degree of the compressor in real time, such that it may be ensured that the refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • Fig. 9 is a block diagram illustrating an air conditioning system according to embodiments of the present invention. As illustrated in Fig. 9 , the air conditioning system 400 includes the anti-liquid-slugging device 500 of the air conditioning system.
  • an anti-liquid-slugging protection is realized by monitoring the discharge superheat degree of the compressor in real time with the above control device of anti-liquid-slugging of air conditioning system, such that it may be ensured that the refrigerant sucked back through a gas inlet of the compressor is gaseous, thereby preventing liquid refrigerant from entering into the compressor and avoiding the compressor being suffered from the liquid-slugging.
  • the value of the discharge superheat degree is relatively large, which is easy for data detection and anti-liquid-slugging control, an accuracy of anti-liquid-slugging control is improved and security and reliability during the operating process of the air conditioning system are improved.
  • the logic and/or steps described in other manners herein or shown in the flow chart, for example, may be considered as a particular sequence table of executable instructions for realizing the logical function, may be specifically achieved in any computer readable medium to be used by the instruction execution system, device or equipment (such as the system based on computers, the system comprising processors or other systems capable of obtaining the instruction from the instruction execution system, device and equipment and executing the instruction), or to be used in combination with the instruction execution system, device and equipment.
  • the computer readable medium may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, device or equipment.
  • the computer readable medium comprises but are not limited to: an electronic connection (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber device and a portable compact disk read-only memory (CDROM).
  • the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed with other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
  • each part of the present invention may be realized by the hardware, software, firmware or their combination.
  • a plurality of steps or methods may be realized by the software or firmware stored in the memory and executed by the appropriate instruction execution system.
  • the steps or methods may be realized by one or a combination of the following techniques known in the art: a discrete logic circuit having a logic gate circuit for realizing a logic function of a data signal, an application-specific integrated circuit having an appropriate combination logic gate circuit, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.
  • the terms “mounted,” “connected,” “coupled,” and “fixed” are used broadly and encompass such as fixed, detachable or integral connections; also can be mechanical or electrical connections, also can be direct and indirect connections via an intermediate medium, and further can be internal connections or the interactions between two elements, unless otherwise expressly defined which can be understood by those skilled in the art according to the detail embodiment of the present invention.

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Claims (12)

  1. Procédé de commande destiné à empêcher un système de conditionnement d'air de subir un coup de liquide, comprenant :
    le fait d'acquérir (S10, S102) un degré de surchauffe d'évacuation d'un compresseur en temps réel, et le fait de surveiller le degré de surchauffe d'évacuation pendant un processus de fonctionnement du système de conditionnement d'air ;
    le procédé de commande étant caractérisée par
    lorsque le degré de surchauffe d'évacuation est inférieur à une première valeur prédéfinie pendant une première période de temps prédéfinie,
    le fait de commander (S20, S106) une minuterie pour qu'elle démarre un chronométrage, et
    le fait de déterminer (S 107) si le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie ;
    lorsqu'il est déterminé que le degré de surchauffe d'évacuation n'est pas supérieur ou égal à la première valeur prédéfinie :
    le fait de déterminer (S110) qu'une période de temps comptée de la minuterie atteint une deuxième période de temps prédéfinie, et
    le fait de commander (S30, S111) une unité extérieure du système de conditionnement d'air pour qu'elle s'arrête pour empêcher le compresseur de subir un coup de liquide ; et
    lorsqu'il est déterminé que le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie :
    le fait de déterminer (S 108) si le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie pendant une troisième période de temps prédéfinie, et
    lorsque le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie pendant une troisième période de temps prédéfinie,
    le fait de réinitialiser (S109) la minuterie et de continuer à déterminer si le degré de surchauffe d'évacuation satisfait à une condition que la minuterie commence à chronométrer.
  2. Procédé de commande selon la revendication 1, après avoir commandé à l'unité extérieure de s'arrêter, comprenant en outre : le fait de déterminer (S112) si un certain nombre de protections anti-coup de liquide activées par le système de conditionnement d'air pendant une quatrième période de temps prédéfinie dépasse un certain nombre prédéfini, dans lequel,
    pendant que le nombre de protections anti-coup de liquide activées par le système de conditionnement d'air pendant la quatrième période de temps prédéfinie dépasse le nombre prédéfini, le fait de commander (S113) l'unité extérieure pour qu'elle soit irrécupérable sans être mise hors tension ; et
    pendant que le nombre de protections anti-coup de liquide activées par le système de conditionnement d'air pendant la quatrième période de temps prédéfinie ne dépasse pas le nombre prédéfini, le fait de réinitialiser (S114) la minuterie et de commander l'unité extérieure pour qu'elle redémarre après une cinquième période de temps prédéfinie.
  3. Procédé de commande selon l'une quelconque des revendications 1 à 2, dans lequel le système de conditionnement d'air comprend le compresseur, un condenseur et un évaporateur, et le fait d'acquérir le degré de surchauffe de vidange du compresseur en temps réel comprend :
    le fait de détecter une température d'une sortie de gaz du compresseur, et le fait de détecter une température d'une partie centrale du condenseur et une température d'une partie centrale de l'évaporateur ;
    lorsque le système de conditionnement d'air se trouve dans un mode de réfrigération, le fait de calculer le degré de surchauffe de vidange du compresseur selon la température de la sortie des gaz et la température de la partie centrale du condenseur ; et
    lorsque le système de conditionnement d'air se trouve dans un mode de chauffage, le fait de calculer le degré de surchauffe de vidange du compresseur selon la température de la sortie de gaz et la température de la partie centrale de l'évaporateur.
  4. Procédé de commande selon l'une quelconque des revendications 1 à 2, dans lequel le fait d'acquérir le degré de surchauffe d'évacuation du compresseur en temps réel comprend :
    le fait de détecter une pression d'une sortie de gaz du compresseur et le fait de détecter une température de la sortie de gaz du compresseur ; et
    le fait de calculer le degré de surchauffe d'évacuation du compresseur selon la pression de la sortie du gaz et la température de la sortie du gaz.
  5. Procédé de commande selon la revendication 2, dans lequel la première période de temps prédéfinie est de 20 minutes, la deuxième période de temps prédéfinie est de 30 minutes, la troisième période de temps prédéfinie est de 5 minutes, la quatrième période de temps prédéfinie est de 120 minutes, et la cinquième période de temps prédéfinie est de 6 minutes.
  6. Support de stockage lisible par ordinateur non transitoire, ayant un programme informatique stocké sur celui-ci, dans lequel le programme informatique, lorsqu'il est exécuté par un processeur, met en œuvre un procédé de commande destiné à empêcher un système de conditionnement d'air de subir un coup de liquide selon l'une quelconque des revendications 1 à 5.
  7. Dispositif de commande (500) destiné à empêcher un système de conditionnement d'air de subir un coup de liquide, dans lequel le système de conditionnement d'air comprend un compresseur (100) et une unité extérieure, le dispositif de commande (500) comprenant :
    une minuterie (60) ;
    un module d'acquisition (10), configuré pour acquérir un degré de surchauffe d'évacuation du compresseur (100) en temps réel ;
    un module de surveillance (20), configuré pour surveiller le degré de surchauffe de vidange pendant un processus de fonctionnement du système de conditionnement d'air ;
    le dispositif de commande étant caractérisé en ce qu'il comprend en outre
    un module de commande (30), configuré, lorsque le degré de surchauffe d'évacuation est inférieur à une première valeur prédéfinie pendant une première période de temps prédéfinie, pour commander la minuterie (60) pour qu'elle démarre un chronométrage ; et déterminer si le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie ; et
    en réponse au fait de déterminer que le degré de surchauffe d'évacuation n'est pas supérieur ou égal à la première valeur prédéfinie, déterminer qu'une période de temps comptée de la minuterie atteint une deuxième période de temps prédéfinie, commander l'unité extérieure du système de conditionnement d'air pour qu'elle s'arrête pour empêcher le compresseur de subir un coup de liquide, et
    en réponse au fait de déterminer que le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie pendant une troisième période de temps prédéfinie, le module de commande est configuré pour déterminer si le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie pendant une troisième période de temps prédéfinie, et
    en réponse au fait de déterminer que le degré de surchauffe d'évacuation est supérieur ou égal à la première valeur prédéfinie pendant une troisième période de temps prédéfinie, réinitialiser la minuterie et continuer à déterminer si le degré de surchauffe d'évacuation satisfait à une condition que la minuterie commence à chronométrer.
  8. Dispositif de commande (500) selon la revendication 7, dans lequel, après avoir commandé à l'unité extérieure de s'arrêter, le module de commande est en outre configuré pour déterminer si un certain nombre de protections anti-coup de liquide activées par le système de conditionnement d'air pendant une quatrième période de temps prédéfinie dépasse un certain nombre prédéfini, dans lequel,
    pendant que le nombre de protections anti-coup de liquide activées par le système de conditionnement d'air pendant la quatrième période de temps prédéfinie dépasse le nombre prédéfini, le module de commande est configuré pour commander l'unité extérieure pour qu'elle soit irrécupérable sans être mise hors tension ; et
    pendant que le nombre de protections anti-coup de liquide activées par le système de conditionnement d'air pendant la quatrième période de temps prédéfinie ne dépasse pas le nombre prédéfini, le module de commande est configuré pour réinitialiser la minuterie et commander l'unité extérieure pour qu'elle redémarre après une cinquième période de temps prédéfinie.
  9. Dispositif de commande (500) selon l'une quelconque des revendications 7 à 8, dans lequel le système de conditionnement d'air comprend en outre un condenseur (300) et un évaporateur (200), et le dispositif de commande comprend en outre :
    un premier capteur de température (70) disposé au niveau d'une sortie de gaz du compresseur et configuré pour détecter une température de la sortie de gaz du compresseur ;
    un deuxième capteur de température (80) disposé au niveau d'une partie centrale du condenseur et configuré pour détecter une température de la partie centrale du condenseur ; et
    un troisième capteur de température (90) disposé au niveau d'une partie centrale de l'évaporateur et configuré pour détecter une température de la partie centrale de l'évaporateur ;
    dans lequel le module d'acquisition est en outre configuré pour calculer le degré de surchauffe de vidange du compresseur selon la température de la sortie de gaz et la température de la partie centrale du condenseur lorsque le système de conditionnement d'air se trouve dans un mode de réfrigération ; et pour calculer le degré de surchauffe de vidange du compresseur selon la température de la sortie de gaz et la température de la partie centrale de l'évaporateur lorsque le système de conditionnement d'air se trouve dans un mode de chauffage.
  10. Dispositif de commande (500) selon l'une quelconque des revendications 7 à 9, comprenant en outre un quatrième capteur de température (40) et un capteur de pression (50) disposés au niveau d'une sortie de gaz du compresseur, dans lequel le quatrième capteur de température est configuré pour détecter une température de la sortie de gaz du compresseur et le capteur de pression est configuré pour détecter une pression de la sortie de gaz du compresseur, et le module d'acquisition est configuré pour calculer le degré de surchauffe d'évacuation du compresseur selon la température de la sortie de gaz et la pression de la sortie de gaz.
  11. Dispositif de commande (500) selon la revendication 8, dans lequel la première période de temps prédéfinie est de 20 minutes, la deuxième période de temps prédéfinie est de 30 minutes, la troisième période de temps prédéfinie est de 5 minutes, la quatrième période de temps prédéfinie est de 120 minutes, et la cinquième période de temps prédéfinie est de 6 minutes.
  12. Système de conditionnement d'air (400), comprenant :
    un compresseur (100) ;
    un évaporateur (200) ;
    un condensateur (300) ;
    une unité extérieure ; et
    le dispositif de commande (500) destiné à empêcher un système de conditionnement d'air de subir un coup de liquide selon l'une quelconque des revendications 7 à 11.
EP17870765.9A 2016-11-17 2017-06-22 Procédé et appareil de commande anti-coups de liquide pour système de climatisation et système de climatisation associé Active EP3396262B1 (fr)

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CN201611034105.4A CN106766444B (zh) 2016-11-17 2016-11-17 空调系统的防液击控制方法和控制装置及空调系统
CN201611027983.3A CN106403429B (zh) 2016-11-17 2016-11-17 空调系统的防液击控制方法和控制装置及空调系统
PCT/CN2017/089642 WO2018090626A1 (fr) 2016-11-17 2017-06-22 Procédé et appareil de commande anti-coups de liquide pour système de climatisation et système de climatisation associé

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JP2009109126A (ja) * 2007-10-31 2009-05-21 Daikin Ind Ltd 調湿装置
CN202056042U (zh) * 2011-05-17 2011-11-30 烟台同大制冷设备有限公司 制冷压缩机防液击控制系统
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CN104566823B (zh) * 2014-12-29 2018-03-16 广东美的暖通设备有限公司 并联多联机的冷媒控制方法
CN104964343B (zh) * 2015-06-12 2018-09-11 广东美的暖通设备有限公司 一种提高压缩机运行可靠性的装置和方法
CN105509255A (zh) * 2016-01-04 2016-04-20 广东美的暖通设备有限公司 空调系统的控制方法及空调系统
CN105485992B (zh) * 2016-01-06 2018-09-07 广东美的暖通设备有限公司 空调系统及其欠冷媒检测方法
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