CN112378132B - Defrosting control device and method of air conditioner and air conditioner - Google Patents

Defrosting control device and method of air conditioner and air conditioner Download PDF

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Publication number
CN112378132B
CN112378132B CN202011210247.8A CN202011210247A CN112378132B CN 112378132 B CN112378132 B CN 112378132B CN 202011210247 A CN202011210247 A CN 202011210247A CN 112378132 B CN112378132 B CN 112378132B
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air conditioner
defrosting
air
temperature
time
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CN112378132A (en
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林海荣
孙涛
黄英武
李金奎
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F25B47/022—Defrosting cycles hot gas defrosting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60P—VEHICLES ADAPTED FOR LOAD TRANSPORTATION OR TO TRANSPORT, TO CARRY, OR TO COMPRISE SPECIAL LOADS OR OBJECTS
    • B60P3/00—Vehicles adapted to transport, to carry or to comprise special loads or objects
    • B60P3/20—Refrigerated goods vehicles
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • F25B2347/02—Details of defrosting cycles
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a defrosting control device and method of an air conditioner and the air conditioner, wherein the device comprises: an acquisition unit and a control unit; the acquisition unit is configured to acquire an inlet air temperature, an inlet air humidity, an outlet air temperature and an outlet air humidity of the air conditioner; the control unit is configured to determine the frosting amount of an evaporator of the air conditioner according to the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity; determining whether the air conditioner needs defrosting according to the air inlet temperature, the air outlet temperature and the frosting amount; and controlling the air conditioner to enter a defrosting mode and controlling defrosting time of the air conditioner in the defrosting mode under the condition that the air conditioner needs defrosting. According to the scheme, the judgment logics of the entering condition and the exiting condition of defrosting during hot gas bypass defrosting are intelligentized, so that the hot gas bypass defrosting is suitable for different working conditions.

Description

Defrosting control device and method of air conditioner and air conditioner
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a defrosting control device and method of an air conditioner and the air conditioner, in particular to a hot gas bypass defrosting control device and method applied to a refrigerator car and the air conditioner (such as the air conditioner for the refrigerator car).
Background
In the case of a refrigerator car, moisture in a carriage condenses to frost on the surface of an evaporator during the refrigerating process of a unit. The frost layer can be attached to the evaporator, so that the heat exchange coefficient of the evaporator is reduced, and an air channel is blocked; thereby affecting the refrigeration effect and increasing the power consumption. In a related scheme, a defrosting mode of the unit is hot gas bypass defrosting, but the judgment logics of the entering condition and the exiting condition of the defrosting during the hot gas bypass defrosting are not intelligent enough, and the unit cannot adapt to different working conditions well.
Disclosure of Invention
The invention aims to provide a defrosting control device and method of an air conditioner and the air conditioner, which aim to solve the problems that the judgment logics of the entering condition and the exit condition of defrosting are not intelligent enough and cannot adapt to different working conditions when hot gas is bypassed for defrosting, and achieve the effect of intelligentizing the judgment logics of the entering condition and the exit condition of defrosting when hot gas is bypassed for defrosting so as to adapt to different working conditions.
The invention provides a defrosting control device of an air conditioner, which comprises: an acquisition unit and a control unit; the acquisition unit is configured to acquire an inlet air temperature, an inlet air humidity, an outlet air temperature and an outlet air humidity of the air conditioner; the control unit is configured to determine the frosting amount of an evaporator of the air conditioner according to the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity; determining whether the air conditioner needs defrosting according to the air inlet temperature, the air outlet temperature and the frosting amount; and controlling the air conditioner to enter a defrosting mode and controlling defrosting time of the air conditioner in the defrosting mode under the condition that the air conditioner needs defrosting.
In some embodiments, the determining, by the control unit, whether defrosting of the air conditioner is required according to the intake air temperature, the outlet air temperature, and the frosting amount includes: if the accumulated frosting amount reaches the preset maximum frosting amount, determining that the air conditioner needs to be defrosted; or if the temperature difference between the inlet air temperature and the outlet air temperature is less than the set temperature and the accumulated frosting amount reaches the preset minimum frosting amount, determining that the air conditioner needs to be defrosted.
In some embodiments, the control unit determines whether the air conditioner needs defrosting according to the intake air temperature, the outlet air temperature and the frosting amount, and further includes: and if the temperature difference between the inlet air temperature and the outlet air temperature is less than a first set temperature and the accumulated frosting amount does not reach a preset minimum frosting amount, controlling the opening of the throttling device of the air conditioner to increase.
In some embodiments, the control unit controlling a defrosting time of the air conditioner in the defrosting mode includes: if the air conditioner firstly enters the defrosting mode after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the running time of the compressor of the air conditioner as the defrosting time when the air conditioner firstly enters the defrosting mode after being started; after the defrosting mode is finished, determining a defrosting correction coefficient according to the temperature of an evaporation tube of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient is used as the defrosting correction coefficient when the air conditioner enters the defrosting mode for the second time after the air conditioner is started; and if the air conditioner enters the defrosting mode for the second time after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the product of the running time of the compressor of the air conditioner and a defrosting correction coefficient of the air conditioner entering the defrosting mode for the second time after being started as the defrosting time of the air conditioner entering the defrosting mode for the second time after being started.
In some embodiments, the frost correction factor includes: the product of the first frost correction coefficient and the second frost correction coefficient; the control unit determines a defrosting correction coefficient according to the temperature of an evaporation pipe of the air conditioner and the indoor environment temperature of the air conditioner, and comprises: in the process that the air conditioner operates according to the target indoor environment temperature of the air conditioner, if the suction pressure of a compressor of the air conditioner is smaller than a set pressure, a first defrosting correction coefficient is larger than 1; in the total time of a defrosting cycle, the proportion of the time that the temperature of an evaporation tube of the air conditioner is higher than a second set temperature or the indoor environment temperature of the air conditioner is higher than a third set temperature in the total time of the defrosting cycle is taken as a second defrosting correction coefficient; the second frost correction coefficient is a positive number smaller than 1.
In some embodiments, further comprising: the control unit is further configured to control a compressor of the air conditioner to stop running and control an evaporation fan of the air conditioner to run after the defrosting time is reached so as to blow off defrosting water on an evaporator of the air conditioner; and under the condition that the air outlet humidity of the air conditioner reaches the set humidity, controlling the heating unit which is started when the air conditioner defrosts to be closed so as to enable the air conditioner to exit the defrosting mode.
In accordance with another aspect of the present invention, there is provided an air conditioner including: the defrosting control device of the air conditioner is described above.
In match with the air conditioner, the invention also provides a defrosting control method of the air conditioner, which comprises the following steps: acquiring the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity of the air conditioner; determining the frosting amount of an evaporator of the air conditioner according to the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity; determining whether the air conditioner needs defrosting according to the air inlet temperature, the air outlet temperature and the frosting amount; and controlling the air conditioner to enter a defrosting mode and controlling defrosting time of the air conditioner in the defrosting mode under the condition that the air conditioner needs defrosting.
In some embodiments, determining whether the air conditioner needs defrosting according to the inlet air temperature, the outlet air temperature and the frosting amount comprises: if the accumulated frosting amount reaches the preset maximum frosting amount, determining that the air conditioner needs to be defrosted; or if the temperature difference between the inlet air temperature and the outlet air temperature is less than the set temperature and the accumulated frosting amount reaches the preset minimum frosting amount, determining that the air conditioner needs to be defrosted.
In some embodiments, determining whether the air conditioner needs defrosting according to the inlet air temperature, the outlet air temperature and the frosting amount further comprises: and if the temperature difference between the inlet air temperature and the outlet air temperature is less than a first set temperature and the accumulated frosting amount does not reach a preset minimum frosting amount, controlling the opening of the throttling device of the air conditioner to increase.
In some embodiments, controlling a defrosting time of the air conditioner in the defrosting mode includes: if the air conditioner firstly enters the defrosting mode after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the running time of the compressor of the air conditioner as the defrosting time when the air conditioner firstly enters the defrosting mode after being started; after the defrosting mode is finished, determining a defrosting correction coefficient according to the temperature of an evaporation tube of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient is used as the defrosting correction coefficient when the air conditioner enters the defrosting mode for the second time after the air conditioner is started; and if the air conditioner enters the defrosting mode for the second time after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the product of the running time of the compressor of the air conditioner and a defrosting correction coefficient of the air conditioner entering the defrosting mode for the second time after being started as the defrosting time of the air conditioner entering the defrosting mode for the second time after being started.
In some embodiments, the frost correction factor includes: the product of the first frost correction coefficient and the second frost correction coefficient; determining a defrosting correction coefficient according to the temperature of the evaporating pipe of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient comprises the following steps: in the process that the air conditioner operates according to the target indoor environment temperature of the air conditioner, if the suction pressure of a compressor of the air conditioner is smaller than a set pressure, a first defrosting correction coefficient is larger than 1; in the total time of a defrosting cycle, the proportion of the time that the temperature of an evaporation tube of the air conditioner is higher than a second set temperature or the indoor environment temperature of the air conditioner is higher than a third set temperature in the total time of the defrosting cycle is taken as a second defrosting correction coefficient; the second frost correction coefficient is a positive number smaller than 1.
In some embodiments, further comprising: after the defrosting time is up, controlling a compressor of the air conditioner to stop running and controlling an evaporation fan of the air conditioner to run so as to blow down defrosting water on an evaporator of the air conditioner; and under the condition that the air outlet humidity of the air conditioner reaches the set humidity, controlling the heating unit which is started when the air conditioner defrosts to be closed so as to enable the air conditioner to exit the defrosting mode.
Therefore, according to the scheme of the invention, the difference value of the moisture contents of air entering and exiting the evaporator is calculated according to the temperature and humidity of the inlet air and the outlet air of the unit, and the frost formation amount of the evaporator is calculated by combining the air volume of the fan, so that the frost formation amount is taken as one of judgment conditions for entering defrosting, and whether the unit needs defrosting is accurately judged; the air outlet humidity is used as the judgment basis for the dripping and exiting, the drainage is ensured to be clean, and the judgment logics of the entering condition and the exiting condition of defrosting during hot air bypass defrosting are intelligentized so as to adapt to different working conditions.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a defrosting control device of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of a refrigerated vehicle according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating hot gas bypass defrost control according to one embodiment of the refrigerated vehicle of the present invention;
FIG. 4 is a flowchart illustrating a defrosting control method of an air conditioner according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating an embodiment of a control process for exiting the defrosting mode in the method of the present invention.
The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:
1-air supply temperature sensor; 2-air supply humidity sensor; 3-an evaporator; 4-an evaporation fan; 5-return air temperature sensor; 6-return air humidity sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, there is provided a defrosting control apparatus of an air conditioner. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The defrosting control device of the air conditioner may include: an acquisition unit and a control unit.
Wherein, the acquisition unit is configured to acquire the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity of the air conditioner.
Specifically, the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity of the air conditioner can be collected through the air supply temperature sensor 1 and the air supply humidity sensor 2 which are arranged at the air supply outlet of the evaporator 3, and the evaporation fan 4, the return air temperature sensor 5 and the return air humidity sensor 6 which are arranged at the return air inlet of the evaporator 3.
The control unit is configured to determine the frosting amount of the evaporator of the air conditioner according to the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity.
Specifically, the temperature and humidity of the inlet air and the outlet air can be obtained through a humidity sensor and a temperature sensor of the inlet air and the outlet air, the difference value of the moisture content of the air in and out of the evaporator is calculated, and the frosting amount of the evaporator can be calculated by combining the air volume of the fan.
The control unit is further configured to determine whether the air conditioner needs defrosting according to the inlet air temperature, the outlet air temperature and the frosting amount.
In some embodiments, the control unit determines whether the air conditioner needs defrosting according to the inlet air temperature, the outlet air temperature and the frosting amount, and includes a determination process of whether defrosting needs to be performed, where the determination process includes:
the first determination process of whether defrosting is required: the control unit is specifically configured to determine that the air conditioner needs defrosting if the accumulated frosting amount reaches a preset maximum frosting amount.
Specifically, under the condition that the unit is operated, whether the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unit or not is determinedfmax: if the accumulated frost formation amount of the unit meets the preset condition of the unitMaximum frosting amount MfmaxAnd the unit enters defrosting.
The second determination process of whether defrosting is required: the control unit is specifically configured to determine that the air conditioner needs defrosting if the temperature difference between the inlet air temperature and the outlet air temperature is less than a set temperature and the accumulated frosting amount reaches a preset minimum frosting amount.
Specifically, under the condition that the unit is operated, whether the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unit or not is determinedfmax: if the accumulated frost formation amount of the unit does not meet the maximum frost formation amount M preset by the unitfmaxWhen the suction pressure meets continuous 2s evacuation, the frosting amount also needs to meet the minimum frosting amount M preset by the unitfminIn time, the unit can enter defrosting.
Therefore, the humidity sensors are arranged at the air inlet and the air outlet, the humidity of the inlet air and the outlet air is monitored in real time, the air quantity of the evaporation fan is combined, and the accumulated frosting amount during the operation of the unit is calculated, so that frequent defrosting or untimely defrosting of the unit is avoided.
In some embodiments, the control unit determines whether the air conditioner needs defrosting according to the intake air temperature, the outlet air temperature and the frosting amount, and further includes: the control unit is specifically configured to control the opening of the throttling device of the air conditioner to be increased if the temperature difference between the air inlet temperature and the air outlet temperature is smaller than a first set temperature and the frosting amount accumulation does not reach a preset minimum frosting amount, so that the acquisition unit acquires the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity of the air conditioner again, and determines whether the air conditioner needs to defrost again according to the acquired air inlet temperature, the air outlet temperature and the frosting amount. A first set temperature, e.g. T1。
Specifically, under the condition that the unit is operated, whether the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unit or not is determinedfmax: if the accumulated frost formation amount of the unit does not meet the maximum frost formation amount M preset by the unitfmaxWhen the suction pressure satisfies the continuous 2s evacuationWhen the frosting amount is not met, the frosting amount reaches the minimum frosting amount M preset by the unitfminAnd increasing the step number of the electronic expansion valve, for example, increasing the step number of the electronic expansion valve of the control unit by N steps, wherein N is a positive number.
The control unit is further configured to control the air conditioner to enter a defrosting mode and control defrosting time of the air conditioner in the defrosting mode when the air conditioner needs defrosting. Controlling the air conditioner to enter a defrosting mode, comprising: and controlling a heating unit of the air conditioner, such as a heat tracing wire, to be started.
From this, through increase a temperature and humidity sensor at business turn over wind gap, increase the collection parameter of a unit to in participating in the control of unit, the condition of frosting on the evaporimeter can accurately be judged to the humiture in business turn over wind gap combines other parameter, and the condition of defrosting makes the unit defrosting more intelligent, and it is more effective to defrost.
In some embodiments, the control unit, in a case where the air conditioner needs defrosting, controls the air conditioner to enter a defrosting mode, and controls a defrosting time of the air conditioner in the defrosting mode, and the control unit includes any one of the following processes of controlling the defrosting time:
the first process for controlling defrosting time comprises the following steps: the control unit is specifically configured to determine a compressor running time of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner if the air conditioner firstly enters the defrosting mode after being started, and use the compressor running time of the air conditioner as the defrosting time when the air conditioner firstly enters the defrosting mode after being started; and after the defrosting mode is finished, determining a defrosting correction coefficient according to the temperature of an evaporation tube of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient is used as the defrosting correction coefficient when the air conditioner enters the defrosting mode again after the air conditioner enters the defrosting mode for the first time after the air conditioner is started, namely the defrosting correction coefficient when the air conditioner enters the defrosting mode for the second time after the air conditioner is started.
The second process for controlling defrosting time comprises the following steps: the control unit is specifically configured to, if the air conditioner enters the defrosting mode again after being started up, that is, the air conditioner enters the defrosting mode again after being started up, determine a compressor running time of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and take a product of the compressor running time of the air conditioner and a defrosting correction coefficient when the air conditioner enters the defrosting mode again after being started up, that is, a product of the compressor running time of the air conditioner and the defrosting correction coefficient when the air conditioner enters the defrosting mode again after being started up, as a defrosting time when the air conditioner enters the defrosting mode again after being started up, that is, as a defrosting time when the air conditioner enters the defrosting mode again after being started up, and the defrosting time when entering the defrosting mode each time is dynamically adjusted according to the defrosting time.
Specifically, after the unit is defrosted, the defrosting time is determined by the frosting amount of the unit, hot defrosting is realized by introducing high-temperature exhaust gas into an evaporator by a compressor for defrosting, and the running time T of the compressor isOperation of(t, Mf) from the frosting amount M of the defrosting cyclefAnd the temperature t in the compartment is determined, namely the heat provided by the compressor is enough to melt the frost, and the defrosting time can be obtained through theoretical calculation and experiments. During defrosting, the running time of the compressor is controlled according to the frosting amount and the compartment body temperature, and the defrosting is accurately performed in an experiment.
Wherein, the running time T of the compressor in the defrosting processOperation of(t,Mf) In, t represents the current compartment temperature, MfIndicating the amount of frosting. The compressor run time can be determined by calculating the heat required for frost melting and the compressor power, or can be confirmed by experiment. The running time of the compressor is controlled according to the frosting amount and the compressor power, and the large temperature fluctuation of the compartment body caused by defrosting is avoided.
In the above example, the defrosting time has a defrosting correction coefficient (i.e., a defrosting time correction parameter) k, and the defrosting correction coefficient k is corrected by the suction pressure after the defrosting of the unit is completed and the change in the temperature of the room when the unit is operating. Therefore, the unit can automatically correct defrosting time in a proper time, and the defrosting deviation is avoided.
In some embodiments, the frost correction factor includes: and the product of the first frost correction coefficient and the second frost correction coefficient.
The control unit determines a defrosting correction coefficient according to the temperature of an evaporation pipe of the air conditioner and the indoor environment temperature of the air conditioner, and comprises the following process of determining the defrosting correction coefficient:
the first process of determining the defrosting correction coefficient: the control unit is specifically further configured to, in a process that the air conditioner operates at the target indoor ambient temperature of the air conditioner, if a suction pressure of a compressor of the air conditioner is less than a set pressure, make a first defrosting correction coefficient greater than 1.
Specifically, after defrosting is finished, the unit operates to a preset compartment temperature, at the moment, if the air suction pressure is smaller than a theoretical value, it is proved that defrosting is not clean last time, the frosting amount at the moment is larger than that calculated by the theory, and the first defrosting correction coefficient K is calculated at the moment1And if the defrosting time is more than 1, the defrosting time is prolonged. Wherein the first frost correction coefficient K1Depending on the comparison of the evaporation temperature of the unit after the defrosting is stable in the period with a preset value, the first defrosting correction coefficient K is more than or equal to 11。
The second process of determining the defrosting correction coefficient: the control unit is specifically configured to determine, as a second frost removal correction coefficient, a ratio of a time during which an evaporator tube temperature of the air conditioner is higher than a second set temperature or an indoor environment temperature of the air conditioner is higher than a third set temperature in a total defrosting period time, to the total defrosting period time. The second frost correction coefficient is a positive number smaller than 1. The second set point temperature, such as 0 c, and the third set point temperature may be a set indoor ambient temperature.
Specifically, when the evaporation temperature (i.e., the tube temperature of the evaporation tube) exceeds 0 ℃ for a certain period of time after defrosting is completed, the second defrosting correction coefficient K is2If the defrosting time is less than 1, the defrosting time is shortened. Wherein the second frost correction coefficient K2Depending on the ratio of the time during which the evaporation temperature is greater than 0 ℃ to the total time of the defrosting cycleValue 0 ≤ second frost correction coefficient K2Less than or equal to 1. According to the evaporation temperature of the unit, the frost formation amount is automatically corrected, and the reliability of defrosting is improved. Of course, the second frost correction coefficient K2The judgment can also be carried out by adopting the temperature of the compartment higher than the temperature point.
In some embodiments, further comprising: the exiting defrosting control process specifically includes:
the control unit is further configured to control the compressor of the air conditioner to stop running and control the evaporation fan 4 of the air conditioner to run to blow down defrosting water on the evaporator 3 of the air conditioner after the defrosting time is reached. And the number of the first and second groups,
the control unit is further configured to control the heating unit which is turned on during defrosting of the air conditioner to be turned off under the condition that the outlet air humidity of the air conditioner reaches a set humidity, so that the air conditioner exits the defrosting mode.
Specifically, after the defrosting time set by the unit is reached, the compressor stops running, the unit enters a water dripping mode at the moment, the evaporation fan 4 is started and stopped according to logic to blow off water on the evaporator 3, and when the air supply humidity detected by the air supply humidity sensor reaches a preset value, the chassis heat tracing wire is closed, and defrosting is finished. The heat tracing wires and the evaporation fan of the water receiving tray are controlled according to the air outlet humidity, so that the defrosting water is prevented from being frozen on the chassis.
Through a large number of tests, the technical scheme of the invention is adopted, the difference value of the moisture contents of air entering and exiting the evaporator is calculated according to the inlet and outlet air temperature and humidity of the unit, the frost formation amount of the evaporator is calculated by combining the air volume of the fan, and the frost formation amount is taken as one of judgment conditions for entering defrosting so as to accurately judge whether the unit needs defrosting. The air outlet humidity is used as the judgment basis for the dripping and exiting, the drainage is ensured to be clean, and the judgment logics of the entering condition and the exiting condition of defrosting during hot air bypass defrosting are intelligentized so as to adapt to different working conditions.
According to an embodiment of the invention, an air conditioner corresponding to the defrosting control device of the air conditioner is also provided. The air conditioner may include: the defrosting control device of the air conditioner is described above.
In the relevant scheme, the defrosting mode of the unit comprises electric heating defrosting, hot gas bypass defrosting and the like, wherein the hot gas bypass defrosting has less energy consumption, the exhaust temperature is lower than that of electric heating, the large fluctuation of the temperature of a carriage cannot be caused, and the application is more and more extensive. However, the logic of the hot gas bypass defrosting of the unit is not intelligent enough, and the entering condition of the hot gas bypass defrosting of the unit in the related scheme is usually a time interval or according to the temperature difference of the returned air and the evaporation pressure. The exit condition of the hot gas bypass defrosting of the unit is based on defrosting time (such as the opening time of a hot gas bypass defrosting electromagnetic valve) or the temperature of a certain point on a defrosting pipeline, and the rigid setting cannot be well adapted to different working conditions. That is to say, the decision logic of the entering condition and the exiting condition of the defrosting during the hot gas bypass defrosting is not intelligent enough, and the hot gas bypass defrosting can not adapt to different working conditions well. For example: for a unit with a wide application range, parameters such as the opening time of an evacuation pressure electromagnetic valve, the water dripping time, the water dripping frequency and the like need to be set frequently; meanwhile, the problems of frequent defrosting, unclean water drainage, large temperature fluctuation and the like are caused.
In some schemes, the humidity inside and outside the refrigerated cabinet and the assumed air volume can only roughly calculate the moisture entering the interior after the door is opened, neglect the volatile moisture of the goods, and calculate the frosting amount inaccurately.
In some schemes, a humidity parameter is introduced into defrosting control, the frosting amount is calculated and is used as a defrosting judgment basis, the amount of defrosting water is calculated through a gravity sensor or a pressure sensor, and defrosting time is corrected; however, in the patent, frosting water is used as the only judgment basis, the frosting amount is calculated through air volume, humidity, temperature and atmospheric pressure, the deviation of any parameter can cause the deviation of the result, and during defrosting, the temperature is higher, and the frosting water can be evaporated; the frosting amount and the defrosting amount cannot be calculated very accurately, and the actual frosting and defrosting conditions of the unit cannot be accurately judged; and the defrosting amount is detected by the gravity sensing device, so that the complexity of the unit is increased.
In some embodiments, the scheme of the invention provides a hot gas bypass defrosting control system applied to a refrigerator car, and a temperature and humidity sensor is added at an air inlet and an air outlet, so that the acquisition parameters of a unit are added and participate in the control of the unit, and the temperature and humidity of the air inlet and the air outlet are combined with other parameters, so that the frosting condition on an evaporator and the defrosting condition can be accurately judged, the defrosting of the unit is more intelligent, and the defrosting is more effective; therefore, the problems of frequent defrosting, untimely defrosting, large temperature fluctuation of a carriage during defrosting, unclean drainage and inaccurate defrosting parameters can be solved.
Specifically, the temperature and humidity of inlet air and outlet air are obtained through a humidity sensor and a temperature sensor of the inlet air and the outlet air, the difference value of the moisture content of the air in the evaporator and the moisture content of the air in the evaporator is calculated, the frosting amount of the evaporator can be calculated by combining the air volume of a fan, and the frosting amount is taken as one of judgment conditions for defrosting, so that whether a unit needs defrosting or not can be accurately judged; the humidity of the air outlet is used as a judgment basis for the dropping and withdrawing, so that the clean water drainage is ensured.
The following describes an exemplary implementation process of the scheme of the present invention with reference to the examples shown in fig. 2 and fig. 3.
Fig. 2 is a schematic diagram of an assembly structure of an embodiment of the refrigerator car of the present invention. As shown in fig. 2, the refrigerator car assembly includes: an air supply temperature sensor 1 and an air supply humidity sensor 2 arranged at an air supply outlet of the evaporator 3, and an evaporation fan 4, a return air temperature sensor 5 and a return air humidity sensor 6 arranged at a return air inlet of the evaporator 3.
In some embodiments, the invention provides a set of intelligent defrosting control system, which can realize intelligent defrosting by calculating the frosting amount, presetting defrosting time, automatically correcting defrosting time and controlling dripping time.
Fig. 3 is a schematic flow chart of the hot air bypass defrosting control of the refrigerator car according to an embodiment of the present invention. As shown in fig. 3, the hot air bypass defrosting control process of the refrigerator car may include:
and step 1, operating the unit.
And 2, judging the defrosting condition of the unit under the condition that the unit operates.
In particular, in the case of a unit operating, the amount of frost formation of the unit is determinedAccumulating whether the maximum frosting amount M preset by the unit is metfmax: if the accumulated frost formation amount of the unit does not meet the maximum frost formation amount M preset by the unitfmaxIf yes, executing step 2; if the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unitfmaxThen step 3 is performed.
Step 2, when the suction pressure meets continuous 2s evacuation, the frosting amount also needs to meet the minimum frosting amount M preset by the unitfminAnd if not, increasing the steps of the electronic expansion valve.
Specifically, if the accumulated frost formation amount of the unit does not meet the maximum frost formation amount M preset by the unitfmaxThen obtain the return air temperature T of the unitReturn air(namely the temperature of the inlet air) and the temperature T of the supply air of the unitAir supply(namely the outlet air temperature) and continuously evacuating the suction pressure of the compressor of the unit for 2s and the return air temperature T of the unitReturn airAir supply temperature T of mixing unitAir supplyThe temperature difference between the two is less than the set temperature T1In case of (3), determining whether the accumulated frost formation amount of the unit meets the preset minimum frost formation amount M of the unitfmin: if the accumulated frost formation amount of the unit does not meet the preset minimum frost formation amount M of the unitfminThen go to step 21; if the accumulated frost formation amount of the unit meets the preset minimum frost formation amount M of the unitfminThen step 22 is performed.
Step 21, if the accumulated frosting amount of the unit meets the preset minimum frosting amount M of the unitfminAnd if so, the unit enters defrosting, and then the step 4 is executed.
Step 22, if the accumulated frosting amount of the unit does not meet the preset minimum frosting amount M of the unitfminAnd controlling the step number of the electronic expansion valve of the unit to increase by N steps, and then returning to the step 1. N is a positive number.
Step 3, when the accumulated frosting amount meets the maximum frosting amount M preset by the unitfmaxAnd (4) defrosting the unit, and then executing the step 4.
In step 2 and step 3, when the frosting amount of the unit is calculated, the mass M of the frost condensed on the evaporator can be calculated according to the temperature and humidity of the inlet air and the outlet air of the unitf：
Figure BDA0002758470040000111
In the above formula, MfIs the amount of frosting; t isPeriod of timeFor a sampling period, n is the number of samples, Δ diThe difference of the moisture contents collected at the ith time is obtained, and the moisture content is the ratio of water vapor in the air to the whole mass (unit is kg per kg); ρ is the air density (in kilograms per m)3) And v is the air volume (unit is m)3/s)。
The calculation process may be: calculating the difference of water vapor quality in inlet air and outlet air, density and volume, and air density of inlet air and outlet air with slight difference, neglecting, and adopting 1.29 kg/m of air3The humidity content temperature, the relative humidity and the atmospheric pressure are obtained by looking up a table, the air quantity is known by fan parameters, and the air inlet and outlet temperature and humidity are mainly used for inquiring the humidity content.
The humidity sensors are arranged at the air inlet and the air outlet, the humidity of the inlet air and the outlet air is monitored in real time, the air quantity of the evaporation fan is combined, and the accumulated frost formation amount during the operation of the unit is calculated, so that frequent defrosting or untimely defrosting of the unit is avoided.
Step 4, after the unit is defrosted, defrosting time is determined by the frosting amount of the unit, hot defrosting is carried out by introducing high-temperature exhaust gas into an evaporator by a compressor, and the running time T of the compressor isOperation of(t,Mf) From the frosting amount M of the defrosting cyclefAnd the temperature t in the compartment is determined, namely the heat provided by the compressor is enough to melt the frost, and the defrosting time can be obtained through theoretical calculation and experiments. During defrosting, the running time of the compressor is controlled according to the frosting amount and the compartment body temperature, and the defrosting is accurately performed in an experiment.
Specifically, the heat required by defrosting mainly comprises latent heat and sensible heat, the latent heat is frosting mass and the specific heat of ice melting, the sensible heat is (0-compartment temperature t) and the specific heat of ice, the defrosting capacity of the heat required by defrosting can be calculated through the two parameters and is mainly determined by the power of a compressor, when a unit is determined, the power of the compressor is a known parameter, the running time of the compressor can be calculated through the power and the heat required by defrosting, and the running time of the compressor is defrosting time.
Wherein, the running time T of the compressor in the defrosting processOperation of(t,Mf) In, t represents the current compartment temperature, MfIndicating the amount of frosting. The compressor run time can be determined by calculating the heat required for frost melting and the compressor power, or can be confirmed by experiment. The running time of the compressor is controlled according to the frosting amount and the compressor power, and the large temperature fluctuation of the compartment body caused by defrosting is avoided. That is, the heat required for defrosting is mainly composed of the frosting amount (latent heat) and the frost accommodating amount (sensible heat), the latent heat is only related to the frosting amount, and the sensible heat is related to the compartment temperature. For example, ice can be melted into water, ice at 0 ℃ can be melted directly, but ice at-20 ℃ needs to be heated to 0 ℃ to be melted.
Specifically, there are two acquisition modes for defrosting time, one is theoretical calculation, and the other is experimental acquisition. The theoretical calculation is as above. The experimental acquisition refers to that the actual defrosting time of the unit is obtained through experiments under the conditions of different frosting amounts and different compartment temperatures, and the defrosting time is obtained through a large number of experiments and is used as a parameter for the operation of the unit, so that the defrosting time is not obtained through theoretical calculation, for example, at the compartment temperature of-10 ℃. Under the condition that the frosting amount is 1 kg, the defrosting time can be obtained through theoretical calculation, and the working condition can be simulated in a laboratory to test the actual defrosting time of the unit.
In the above example, the defrosting time has a defrosting correction coefficient (i.e., a defrosting time correction parameter) k, and the defrosting correction coefficient k is corrected by the suction pressure after the defrosting of the unit is completed and the change in the temperature of the room when the unit is operating. Therefore, the unit can automatically correct defrosting time in a proper time, and the defrosting deviation is avoided. The program can automatically correct the frost formation amount according to the evaporation temperature of the unit and improve the reliability of defrosting.
Optionally, after defrosting of the unit is completed, the unit is operated to a preset compartment temperature, if the suction pressure is smaller than a theoretical value at the moment, it is proved that defrosting is not clean last time, the frosting amount at the moment is larger than that calculated by the theory, and the first defrosting correction coefficient K is calculated at the moment1Is greater than 1, this timeThe defrosting time is prolonged. Wherein the first frost correction coefficient K1Depending on the comparison of the evaporation temperature of the unit after the defrosting is stable in the period with a preset value, the first defrosting correction coefficient K is more than or equal to 11。
Optionally, the second frost correction factor K is greater than 0 deg.C when the evaporating temperature (i.e. evaporating tube temperature) exceeds 0 deg.C for a period of time after defrosting is complete2And if the temperature is less than 1, the refrigerating operation time is shortened. Wherein the second frost correction coefficient K2A second frost correction coefficient K is more than or equal to 02Less than or equal to 1. According to the evaporation temperature of the unit, the frost formation amount is automatically corrected, and the reliability of defrosting is improved.
Wherein, the unit operation mode is: defrosting-refrigerating-defrosting-refrigerating, and circulating.
In the above example, the second frost correction coefficient k2Determined by the evaporation temperature. Of course, the second frost correction coefficient k2Or may be determined by the cabin temperature (i.e., cabin temperature).
Wherein the second frost correction coefficient k2The method has the essence that the calculation of the frosting amount of the unit when the unit is not frosted is corrected, the evaporation temperature is higher than 0 ℃ as the judgment, the accuracy is highest, but the judgment is carried out by adopting the temperature of the compartment higher than the temperature point, and the similar effect can be achieved.
And 5, stopping the operation of the compressor after the defrosting time set by the unit is reached, enabling the unit to enter a water dripping mode, starting and stopping the evaporation fan 4 according to logic to blow off water on the evaporator 3, and closing the heat tracing wire of the chassis when the air supply humidity detected by the air supply humidity sensor reaches a preset value to finish defrosting. The heat tracing wires and the evaporation fan of the water receiving tray are controlled according to the air outlet humidity, so that the defrosting water is prevented from being frozen on the chassis.
Wherein, the water drip mode mainly blows the water that melts above the evaporimeter to the water receiving on, opens through the fan and stops the realization, for example the fan opens 5s and stops 5s, blows suddenly and can produce great blowing power, breaks up the balance of water droplet. When defrosting starts, the heat tracing wire is started.
Since the processing and functions of the air conditioner of this embodiment are basically corresponding to the embodiments, principles and examples of the apparatus shown in fig. 1, the description of this embodiment is not given in detail, and reference may be made to the related descriptions in the embodiments, which are not described herein again.
Through a large number of tests, the technical scheme of the invention can accurately judge the frosting condition and the defrosting condition on the evaporator by participating the temperature and humidity values of the inlet air and the outlet air of the unit in the defrosting control of the unit, so that the unit can be more intelligently defrosted and more effectively defrosted.
According to an embodiment of the present invention, there is also provided a defrosting control method of an air conditioner corresponding to the air conditioner, as shown in fig. 4, which is a schematic flow chart of an embodiment of the method of the present invention. The defrosting control method of the air conditioner may include: step S110 to step S140.
In step S110, the air inlet temperature, the air inlet humidity, the air outlet temperature, and the air outlet humidity of the air conditioner are acquired.
Specifically, the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity of the air conditioner can be collected through the air supply temperature sensor 1 and the air supply humidity sensor 2 which are arranged at the air supply outlet of the evaporator 3, and the evaporation fan 4, the return air temperature sensor 5 and the return air humidity sensor 6 which are arranged at the return air inlet of the evaporator 3.
In step S120, the frosting amount of the evaporator of the air conditioner is determined according to the intake air temperature, the intake air humidity, the output air temperature, and the output air humidity.
Specifically, the temperature and humidity of the inlet air and the outlet air can be obtained through a humidity sensor and a temperature sensor of the inlet air and the outlet air, the difference value of the moisture content of the air in and out of the evaporator is calculated, and the frosting amount of the evaporator can be calculated by combining the air volume of the fan.
In step S130, it is determined whether the air conditioner needs defrosting according to the intake air temperature, the outlet air temperature, and the frosting amount.
In some embodiments, in step S130, determining whether defrosting of the air conditioner is required according to the intake air temperature, the outlet air temperature, and the frosting amount includes determining whether defrosting is required according to any one of the following:
the first determination process of whether defrosting is required: and if the accumulated frosting amount reaches the preset maximum frosting amount, determining that the air conditioner needs to be defrosted.
Specifically, under the condition that the unit is operated, whether the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unit or not is determinedfmax: if the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unitfmaxAnd the unit enters defrosting.
The second determination process of whether defrosting is required: or if the temperature difference between the inlet air temperature and the outlet air temperature is less than the set temperature and the accumulated frosting amount reaches the preset minimum frosting amount, determining that the air conditioner needs to be defrosted.
Specifically, under the condition that the unit is operated, whether the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unit or not is determinedfmax: if the accumulated frost formation amount of the unit does not meet the maximum frost formation amount M preset by the unitfmaxWhen the suction pressure meets continuous 2s evacuation, the frosting amount also needs to meet the minimum frosting amount M preset by the unitfminIn time, the unit can enter defrosting.
Therefore, the humidity sensors are arranged at the air inlet and the air outlet, the humidity of the inlet air and the outlet air is monitored in real time, the air quantity of the evaporation fan is combined, and the accumulated frosting amount during the operation of the unit is calculated, so that frequent defrosting or untimely defrosting of the unit is avoided.
In some embodiments, the determining whether the air conditioner needs defrosting in step S130 according to the intake air temperature, the outlet air temperature, and the frosting amount further includes: if the air inlet temperature with the temperature difference between the air outlet temperatures is less than a first set temperature, and the frosting amount accumulation does not reach the preset minimum frosting amount, the opening of the throttling device of the air conditioner is increased, so that the acquisition unit acquires the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity of the air conditioner again, and acquires the air inlet temperature, the air outlet temperature and the frosting amount and weight againAnd newly determining whether the air conditioner needs defrosting. A first set temperature, e.g. T1。
Specifically, under the condition that the unit is operated, whether the accumulated frost formation amount of the unit meets the preset maximum frost formation amount M of the unit or not is determinedfmax: if the accumulated frost formation amount of the unit does not meet the maximum frost formation amount M preset by the unitfmaxWhen the suction pressure meets continuous 2s of evacuation, if the frosting amount is not met, the minimum frosting amount M preset by the unit is reachedfminAnd increasing the step number of the electronic expansion valve, for example, increasing the step number of the electronic expansion valve of the control unit by N steps, wherein N is a positive number.
In step S140, in a case where the air conditioner needs to be defrosted, the air conditioner is controlled to enter a defrosting mode, and a defrosting time of the air conditioner in the defrosting mode is controlled. Controlling the air conditioner to enter a defrosting mode, comprising: and controlling a heating unit of the air conditioner, such as a heat tracing wire, to be started.
From this, through increase a temperature and humidity sensor at business turn over wind gap, increase the collection parameter of a unit to in participating in the control of unit, the condition of frosting on the evaporimeter can accurately be judged to the humiture in business turn over wind gap combines other parameter, and the condition of defrosting makes the unit defrosting more intelligent, and it is more effective to defrost.
In some embodiments, in the step S140, when the air conditioner needs to be defrosted, the air conditioner is controlled to enter a defrosting mode, and a specific process of controlling a defrosting time of the air conditioner in the defrosting mode includes any one of the following processes of:
the first process for controlling defrosting time comprises the following steps: if the air conditioner firstly enters the defrosting mode after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the running time of the compressor of the air conditioner as the defrosting time when the air conditioner firstly enters the defrosting mode after being started; and after the defrosting mode is finished, determining a defrosting correction coefficient according to the temperature of an evaporation tube of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient is used as the defrosting correction coefficient when the air conditioner enters the defrosting mode again after the air conditioner enters the defrosting mode for the first time after the air conditioner is started, namely the defrosting correction coefficient when the air conditioner enters the defrosting mode for the second time after the air conditioner is started.
The second process for controlling defrosting time comprises the following steps: if the air conditioner enters the defrosting mode again after being started for the first time, namely the air conditioner enters the defrosting mode for the second time after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the product of the running time of the compressor of the air conditioner and a defrosting correction coefficient when the air conditioner enters the defrosting mode again after being started for the first time, namely the product of the running time of the compressor of the air conditioner and the defrosting correction coefficient when the air conditioner enters the defrosting mode for the second time after being started as the defrosting time when the air conditioner enters the defrosting mode again after being started for the first time, namely the defrosting time when the air conditioner enters the defrosting mode for the second time after being started, and the defrosting time when entering the defrosting mode each time is dynamically adjusted according to the defrosting time.
Specifically, after the unit is defrosted, the defrosting time is determined by the frosting amount of the unit, hot defrosting is realized by introducing high-temperature exhaust gas into an evaporator by a compressor for defrosting, and the running time T of the compressor isOperation of(t, Mf) from the frosting amount M of the defrosting cyclefAnd the temperature t in the compartment is determined, namely the heat provided by the compressor is enough to melt the frost, and the defrosting time can be obtained through theoretical calculation and experiments. During defrosting, the running time of the compressor is controlled according to the frosting amount and the compartment body temperature, and the defrosting is accurately performed in an experiment.
Wherein, the running time T of the compressor in the defrosting processOperation of(t,Mf) In, t represents the current compartment temperature, MfIndicating the amount of frosting. The compressor run time can be determined by calculating the heat required for frost melting and the compressor power, or can be confirmed by experiment. The running time of the compressor is controlled according to the frosting amount and the compressor power, and the large temperature fluctuation of the compartment body caused by defrosting is avoided.
In the above example, the defrosting time has a defrosting correction coefficient (i.e., a defrosting time correction parameter) k, and the defrosting correction coefficient k is corrected by the suction pressure after the defrosting of the unit is completed and the change in the temperature of the room when the unit is operating. Therefore, the unit can automatically correct defrosting time in a proper time, and the defrosting deviation is avoided.
In some embodiments, the frost correction factor includes: and the product of the first frost correction coefficient and the second frost correction coefficient.
In some embodiments, determining the defrosting correction coefficient according to the temperature of the evaporating pipe of the air conditioner and the indoor environment temperature of the air conditioner comprises determining the defrosting correction coefficient according to any one of the following processes:
the first process of determining the defrosting correction coefficient: and in the process that the air conditioner operates according to the target indoor environment temperature of the air conditioner, if the suction pressure of a compressor of the air conditioner is smaller than the set pressure, enabling a first defrosting correction coefficient to be larger than 1.
Specifically, after defrosting is finished, the unit operates to a preset compartment temperature, at the moment, if the air suction pressure is smaller than a theoretical value, it is proved that defrosting is not clean last time, the frosting amount at the moment is larger than that calculated by the theory, and the first defrosting correction coefficient K is calculated at the moment1And if the defrosting time is more than 1, the defrosting time is prolonged. Wherein the first frost correction coefficient K1Depending on the comparison of the evaporation temperature of the unit after the defrosting is stable in the period with a preset value, the first defrosting correction coefficient K is more than or equal to 11。
The second process of determining the defrosting correction coefficient: and in the total time of a defrosting period, the proportion of the time that the temperature of an evaporation pipe of the air conditioner is higher than a second set temperature or the indoor environment temperature of the air conditioner is higher than a third set temperature in the total time of the defrosting period to the total time of the defrosting period is used as a second defrosting correction coefficient. The second frost correction coefficient is a positive number smaller than 1. The second set point temperature, such as 0 c, and the third set point temperature may be a set indoor ambient temperature.
Specifically, when the evaporation temperature (i.e., the tube temperature of the evaporation tube) exceeds 0 ℃ for a certain period of time after defrosting is completed, the second step is toDefrosting correction coefficient K2If the defrosting time is less than 1, the defrosting time is shortened. Wherein the second frost correction coefficient K2A second frost correction coefficient K is more than or equal to 02Less than or equal to 1. According to the evaporation temperature of the unit, the frost formation amount is automatically corrected, and the reliability of defrosting is improved. Of course, the second frost correction coefficient K2The judgment can also be carried out by adopting the temperature of the compartment higher than the temperature point.
In some embodiments, further comprising: and the defrosting control process is exited.
The following further describes a specific process of the control process of defrosting exit in combination with a schematic flow chart of an embodiment of the control process of defrosting exit in the method of the present invention shown in fig. 5, and the specific process may include: step S210 and step S220.
And step S210, after the defrosting time is up, controlling a compressor of the air conditioner to stop running, and controlling an evaporation fan 4 of the air conditioner to run so as to blow down defrosting water on an evaporator 3 of the air conditioner.
And the number of the first and second groups,
and step S220, controlling a heating unit which is turned on when the air conditioner defrosts to be turned off under the condition that the outlet air humidity of the air conditioner reaches the set humidity, so that the air conditioner exits the defrosting mode.
Specifically, after the defrosting time set by the unit is reached, the compressor stops running, the unit enters a water dripping mode at the moment, the evaporation fan 4 is started and stopped according to logic to blow off water on the evaporator 3, and when the air supply humidity detected by the air supply humidity sensor reaches a preset value, the chassis heat tracing wire is closed, and defrosting is finished. The heat tracing wires and the evaporation fan of the water receiving tray are controlled according to the air outlet humidity, so that the defrosting water is prevented from being frozen on the chassis.
Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles and examples of the air conditioner, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment.
Through a large number of tests, the technical scheme of the embodiment is adopted, the temperature and humidity of inlet air and outlet air are obtained through the humidity sensor and the temperature sensor of the inlet air and the outlet air, the difference value of the moisture content of the air in and out of the evaporator is calculated, the frosting amount of the evaporator can be calculated by combining the air volume of the fan, the frosting amount is used as one of judgment conditions for entering defrosting, whether the unit needs defrosting can be accurately judged, and the intelligent degree of defrosting control is favorably improved.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims (11)

1. A defrosting control device of an air conditioner, comprising: an acquisition unit and a control unit; wherein the content of the first and second substances,
the acquisition unit is configured to acquire an inlet air temperature, an inlet air humidity, an outlet air temperature and an outlet air humidity of the air conditioner;
the control unit is configured to determine the frosting amount of an evaporator of the air conditioner according to the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity;
determining whether the air conditioner needs defrosting according to the air inlet temperature, the air outlet temperature and the frosting amount; and the number of the first and second groups,
under the condition that the air conditioner needs to be defrosted, controlling the air conditioner to enter a defrosting mode, and controlling defrosting time of the air conditioner in the defrosting mode, wherein the defrosting time comprises the following steps: if the air conditioner firstly enters the defrosting mode after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the running time of the compressor of the air conditioner as the defrosting time when the air conditioner firstly enters the defrosting mode after being started; after the defrosting mode is finished, determining a defrosting correction coefficient according to the temperature of an evaporation tube of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient is used as the defrosting correction coefficient when the air conditioner enters the defrosting mode for the second time after the air conditioner is started;
the defrosting correction coefficient comprises: the product of the first frost correction coefficient and the second frost correction coefficient; the control unit determines a defrosting correction coefficient according to the temperature of an evaporation pipe of the air conditioner and the indoor environment temperature of the air conditioner, and comprises:
in the process that the air conditioner operates according to the target indoor environment temperature of the air conditioner, if the suction pressure of a compressor of the air conditioner is smaller than a set pressure, a first defrosting correction coefficient is larger than 1;
in the total time of a defrosting cycle, the proportion of the time that the temperature of an evaporation tube of the air conditioner is higher than a second set temperature or the indoor environment temperature of the air conditioner is higher than a third set temperature in the total time of the defrosting cycle is taken as a second defrosting correction coefficient; the second frost correction coefficient is a positive number smaller than 1.
2. The defrosting control device of an air conditioner according to claim 1, wherein the control unit determines whether the air conditioner needs to be defrosted according to the intake air temperature, the outlet air temperature and the frosting amount, and comprises:
if the accumulated frosting amount reaches the preset maximum frosting amount, determining that the air conditioner needs to be defrosted;
or if the temperature difference between the inlet air temperature and the outlet air temperature is less than the set temperature and the accumulated frosting amount reaches the preset minimum frosting amount, determining that the air conditioner needs to be defrosted.
3. The defrosting control device of an air conditioner according to claim 2, wherein the control unit determines whether the air conditioner needs to be defrosted according to the intake air temperature, the outlet air temperature, and the amount of frosting, and further comprises:
and if the temperature difference between the inlet air temperature and the outlet air temperature is less than a first set temperature and the accumulated frosting amount does not reach a preset minimum frosting amount, controlling the opening of the throttling device of the air conditioner to increase.
4. The defrosting control device of an air conditioner according to any one of claims 1 to 3, wherein the control unit controls a defrosting time of the air conditioner in the defrosting mode, further comprising:
and if the air conditioner enters the defrosting mode for the second time after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the product of the running time of the compressor of the air conditioner and a defrosting correction coefficient of the air conditioner entering the defrosting mode for the second time after being started as the defrosting time of the air conditioner entering the defrosting mode for the second time after being started.
5. The defrosting control device of an air conditioner according to any one of claims 1 to 3, further comprising:
the control unit is further configured to control a compressor of the air conditioner to stop running and control an evaporation fan (4) of the air conditioner to run after the defrosting time is reached so as to blow down defrosting water on an evaporator (3) of the air conditioner; and the number of the first and second groups,
and under the condition that the air outlet humidity of the air conditioner reaches the set humidity, controlling the heating unit which is started when the air conditioner defrosts to be closed so as to enable the air conditioner to exit the defrosting mode.
6. An air conditioner, comprising: the defrosting control device of an air conditioner according to any one of claims 1 to 5.
7. A defrosting control method of an air conditioner is characterized by comprising the following steps:
acquiring the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity of the air conditioner;
determining the frosting amount of an evaporator of the air conditioner according to the air inlet temperature, the air inlet humidity, the air outlet temperature and the air outlet humidity;
determining whether the air conditioner needs defrosting according to the air inlet temperature, the air outlet temperature and the frosting amount; and the number of the first and second groups,
under the condition that the air conditioner needs to be defrosted, controlling the air conditioner to enter a defrosting mode, and controlling defrosting time of the air conditioner in the defrosting mode, wherein the defrosting time comprises the following steps: if the air conditioner firstly enters the defrosting mode after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the running time of the compressor of the air conditioner as the defrosting time when the air conditioner firstly enters the defrosting mode after being started; after the defrosting mode is finished, determining a defrosting correction coefficient according to the temperature of an evaporation tube of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient is used as the defrosting correction coefficient when the air conditioner enters the defrosting mode for the second time after the air conditioner is started;
the defrosting correction coefficient comprises: the product of the first frost correction coefficient and the second frost correction coefficient; determining a defrosting correction coefficient according to the temperature of the evaporating pipe of the air conditioner and the indoor environment temperature of the air conditioner, wherein the defrosting correction coefficient comprises the following steps:
in the process that the air conditioner operates according to the target indoor environment temperature of the air conditioner, if the suction pressure of a compressor of the air conditioner is smaller than a set pressure, a first defrosting correction coefficient is larger than 1;
in the total time of a defrosting cycle, the proportion of the time that the temperature of an evaporation tube of the air conditioner is higher than a second set temperature or the indoor environment temperature of the air conditioner is higher than a third set temperature in the total time of the defrosting cycle is taken as a second defrosting correction coefficient; the second frost correction coefficient is a positive number smaller than 1.
8. The defrosting control method of an air conditioner according to claim 7, wherein determining whether the air conditioner needs to be defrosted according to the inlet air temperature, the outlet air temperature and the frosting amount comprises:
if the accumulated frosting amount reaches the preset maximum frosting amount, determining that the air conditioner needs to be defrosted;
or if the temperature difference between the inlet air temperature and the outlet air temperature is less than the set temperature and the accumulated frosting amount reaches the preset minimum frosting amount, determining that the air conditioner needs to be defrosted.
9. The defrosting control method of an air conditioner according to claim 8, wherein determining whether the air conditioner needs to be defrosted according to the intake air temperature, the outlet air temperature and the frosting amount further comprises:
and if the temperature difference between the inlet air temperature and the outlet air temperature is less than a first set temperature and the accumulated frosting amount does not reach a preset minimum frosting amount, controlling the opening of the throttling device of the air conditioner to increase.
10. The defrosting control method of an air conditioner according to any one of claims 7 to 9, wherein controlling a defrosting time of the air conditioner in the defrosting mode further comprises:
and if the air conditioner enters the defrosting mode for the second time after being started, determining the running time of a compressor of the air conditioner according to the frosting amount and the indoor environment temperature of the air conditioner, and taking the product of the running time of the compressor of the air conditioner and a defrosting correction coefficient of the air conditioner entering the defrosting mode for the second time after being started as the defrosting time of the air conditioner entering the defrosting mode for the second time after being started.
11. The defrosting control method of an air conditioner according to any one of claims 7 to 9, further comprising:
after the defrosting time is up, controlling a compressor of the air conditioner to stop running, and controlling an evaporation fan (4) of the air conditioner to run so as to blow down defrosting water on an evaporator (3) of the air conditioner; and the number of the first and second groups,
and under the condition that the air outlet humidity of the air conditioner reaches the set humidity, controlling the heating unit which is started when the air conditioner defrosts to be closed so as to enable the air conditioner to exit the defrosting mode.
CN202011210247.8A 2020-11-03 2020-11-03 Defrosting control device and method of air conditioner and air conditioner Active CN112378132B (en)

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