CN110940067B - Control method and device for automatically supplementing liquid adding amount in refrigeration mode and air conditioner - Google Patents

Control method and device for automatically supplementing liquid adding amount in refrigeration mode and air conditioner Download PDF

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CN110940067B
CN110940067B CN201911295973.1A CN201911295973A CN110940067B CN 110940067 B CN110940067 B CN 110940067B CN 201911295973 A CN201911295973 A CN 201911295973A CN 110940067 B CN110940067 B CN 110940067B
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pipeline
real
temperature
air conditioning
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CN110940067A (en
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易忠衍
王义祥
王成
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • 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
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a control method and a device for automatically supplementing liquid adding amount in a refrigeration mode and an air conditioner, wherein the method comprises the following steps: when the air conditioning system is started in a refrigeration mode, judging whether the air conditioning system is powered on for the first time, if so, entering a debugging stage, and if not, operating the air conditioning system according to the set refrigeration mode; after the air conditioning system operates for a first preset time, continuously detecting and recording the real-time exhaust temperature, the real-time outdoor environment temperature and the real-time indoor coil temperature; and controlling the air supplement pipeline or the liquid storage pipeline of the air conditioning system to be communicated with the refrigerant circulation main system pipeline according to the real-time exhaust temperature, the real-time outdoor environment temperature, the real-time indoor coil temperature, the preset exhaust temperature and the initial indoor coil temperature. According to the invention, the refrigerant quantity in the air conditioning system is automatically adjusted by controlling the air supplement pipeline or the liquid storage pipeline to be connected into the refrigerant circulation main system pipeline, so that liquid adding operation by a professional is not required, the leakage risk existing in refrigerant filling is avoided, and the refrigeration effect of the air conditioning system is improved.

Description

Control method and device for automatically supplementing liquid adding amount in refrigeration mode and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device for automatically supplementing liquid adding quantity in a refrigeration mode and an air conditioner.
Background
The amount of liquid leaving the air conditioning unit is generally filled with refrigerant according to the requirement of the national standard pipe length, the national standard pipe length is generally 5m or 7.5m, however, in the engineering installation site of the air conditioner, an ultra-long connecting pipe of 30-50m generally exists, and in order to ensure the operation effect and reliability of the unit, after-sales installation personnel need to supplement liquid after vacuumizing from an external refrigerant tank when installing the ultra-long connecting pipe on the spot.
However, the liquid adding method has the following defects: (1) aiming at flammable and explosive refrigerants such as R290 refrigerants and R32 refrigerants, safety risks exist in the refrigerant filling process, fire-proof equipment is required to be protected, and equipment consumption is increased; (2) the method needs professional technicians to use various special tools for operation, and the labor consumption is increased; (3) the method needs to be externally connected with a plurality of joint hoses, and the leakage risk causes the inaccurate refrigerant filling amount; (4) the unit cannot automatically adjust and correct the refrigerant charge amount in the set refrigeration operation process, has poor adjustability, and influences the adjustable refrigeration effect and the service life.
Disclosure of Invention
The invention solves the problems that: in a refrigeration mode, an existing air conditioning system needs after-sales personnel to supplement a refrigerant from the outside, and an adding mode has safety risk, consumes manpower and material resources, and cannot realize automatic compensation liquid adding.
In order to solve at least one aspect of the above problems, the present invention provides a method for controlling an automatic refill amount in a refrigeration mode, comprising the steps of:
step S1, when the air conditioning system is started in the refrigeration mode, judging whether the air conditioning system is powered on for the first time, if so, controlling the air conditioning system to enter a debugging stage, and if not, entering step S2;
step S2, controlling the air conditioning system to start a compressor, an indoor fan and an outdoor fan, wherein the air conditioning system operates according to a set refrigeration mode;
step S3, after the air conditioning system operates for a first preset time, continuously detecting and recording an exhaust real-time temperature Td and an outdoor environment real-time temperature Twf, and judging whether to continuously detect the indoor coil real-time temperature Te according to whether the air conditioning system is electrified for the first time;
step S4, controlling a gas supplementing pipeline or a liquid storage pipeline of the air conditioning system to be communicated with a refrigerant circulation main system pipeline according to the exhaust real-time temperature Td, the outdoor environment real-time temperature Twf, the indoor coil real-time temperature Te, a preset exhaust temperature Tds and the indoor coil initial temperature;
the air conditioning system comprises an interchangeable hot gas-liquid separator selectively communicated with a refrigerant circulation main system pipeline, the refrigerant circulation main system pipeline comprises a compressor return gas pipeline and a condenser outlet pipeline, two ends of a gas supplementing pipeline are respectively connected with a gas outlet of the compressor return gas pipeline and an air outlet of the interchangeable hot gas-liquid separator, and two ends of a liquid storage pipeline are respectively connected with a liquid inlet of the condenser outlet pipeline and an interchangeable hot gas-liquid separator.
According to the invention, the replaceable hot gas-liquid separator is arranged in the air-conditioning system, the air supplementing pipeline and the liquid storage pipeline are connected between the replaceable hot gas-liquid separator and the refrigerant circulation main system pipeline, and a proper amount of refrigerant is stored in the replaceable hot gas-liquid separator in advance, so that the air supplementing pipeline or the liquid storage pipeline is controlled to be connected into the refrigerant circulation main system pipeline, the refrigerant quantity in the air-conditioning system is automatically adjusted, the refrigerant is in the optimal refrigerant quantity, liquid adding operation by professional technicians is not needed, the leakage risk existing in refrigerant filling is avoided, and the refrigeration effect of the air-conditioning system is improved.
Further, the debugging stage specifically includes: and controlling the indoor fan to operate according to a set rotating speed, enabling the compressor and the outdoor fan not to be electrified to operate, and enabling the air supplementing pipeline and the liquid storage pipeline to be simultaneously connected into the refrigerant circulation main system pipeline, so that the air-conditioning system operates for a fixed time.
And in the debugging stage, the air supplementing pipeline and the liquid storage pipeline are simultaneously connected into a refrigerant circulation main system pipeline so as to balance the pipeline pressure and enable the refrigerant in the air conditioning system to circulate.
Further, the step S3 specifically includes:
when the air conditioning system is powered on for the first time, continuously detecting and recording the exhaust real-time temperature Td and the outdoor environment real-time temperature Twf;
and when the air conditioning system is not powered on for the first time, continuously detecting and recording the exhaust real-time temperature Td, the outdoor environment real-time temperature Twf and the indoor coil real-time temperature Te.
Therefore, after the air conditioning system operates in the set refrigeration mode, whether the refrigerant quantity in the air conditioning system is insufficient or excessive is judged through the comparison of the real-time exhaust temperature Td and the preset exhaust temperature Tds and the comparison of the real-time indoor coil temperature Te and the initial indoor coil temperature Te 0.
Further, when the air conditioning system is powered on for the first time, the conditions for controlling the air supply pipeline to be connected to the refrigerant circulation main system pipeline in step S4 are as follows: the real-time exhaust temperature is greater than the preset exhaust temperature, and the duration time is greater than or equal to a second preset time;
the conditions for controlling the liquid storage pipeline to be connected into the refrigerant circulation main system pipeline are as follows: the real-time exhaust temperature is less than the preset exhaust temperature, and the duration time is greater than or equal to a second preset time.
Therefore, when the exhaust real-time temperature Td is detected to be greater than or equal to the preset exhaust temperature Tds, the exhaust temperature of the air-conditioning system is high at the moment, the quantity of the refrigerant in the air-conditioning system is insufficient, the air supplementing pipeline is connected into the refrigerant circulation main system pipeline, the refrigerant stored in the replaceable hot gas-liquid separator can be supplemented into the refrigerant circulation main system pipeline, and automatic addition of the refrigerant is achieved.
When the exhaust real-time temperature Td is detected to be smaller than the preset exhaust temperature Tds, the exhaust temperature of the air conditioning system is over low at the moment, the quantity of the refrigerants in the air conditioning system is excessive, the liquid storage pipeline is connected into the refrigerant circulation main system pipeline, the redundant refrigerants in the refrigerant circulation main system pipeline can be stored into the replaceable hot gas-liquid separator for standby, and automatic storage of the redundant refrigerants is achieved.
Further, after the step S4, the method further includes:
step S5: and continuously detecting the real-time exhaust temperature and the real-time outdoor environment temperature, and controlling an air conditioning system to operate according to a set refrigeration mode when the conditions that the air supplementing pipeline is connected into the refrigerant circulation main system pipeline and the conditions that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline are not met.
Therefore, whether the refrigerant quantity in the air conditioning system is insufficient or redundant is judged by continuously detecting the exhaust real-time temperature and the outdoor environment temperature in real time, when the judgment condition that the refrigerant quantity is insufficient is met, namely the condition that the air supply pipeline is connected into the refrigerant circulation main system pipeline is met, the refrigerant is supplemented for the air conditioning system, when the judgment condition that the refrigerant quantity is redundant is met, namely the condition that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline is met, the redundant refrigerant in the air conditioning system is recovered, and the refrigerant quantity circulating in the air conditioning system can be automatically adjusted. Otherwise, when the refrigerant quantity in the air-conditioning system does not reach the shortage condition or the excess condition, controlling the air-conditioning system to operate according to a normal refrigeration mode.
Further, if the air conditioning system is not powered on for the first time, the conditions for controlling the air supply pipe to be connected to the refrigerant circulation main system pipe in step S4 are as follows: the real-time exhaust temperature is greater than the preset exhaust temperature, and the duration time is greater than or equal to a second preset time; or the real-time temperature of the indoor coil is less than or equal to the initial temperature of the indoor coil, and the duration time is greater than or equal to a second preset time;
the conditions for controlling the liquid storage pipeline to be connected into the refrigerant circulation main system pipeline are as follows: the real-time exhaust temperature is less than the preset exhaust temperature, the real-time temperature of the indoor coil is greater than the initial temperature of the indoor coil, and the duration time is greater than or equal to second preset time.
Therefore, when the exhaust real-time temperature Td is detected to be greater than or equal to the preset exhaust temperature Tds or the real-time temperature of the indoor coil is detected to be less than or equal to the initial temperature of the indoor coil, the exhaust temperature of the air conditioning system is high at the moment, the quantity of the refrigerant in the air conditioning system is insufficient, the air supplementing pipeline is connected into the refrigerant circulation main system pipeline, the refrigerant stored in the replaceable hot gas-liquid separator can be supplemented into the refrigerant circulation main system pipeline, and automatic addition of the refrigerant is achieved.
When the detected exhaust real-time temperature Td is smaller than the preset exhaust temperature Tds, or the detected exhaust real-time temperature Td is smaller than the preset exhaust temperature Tds and the real-time temperature of the indoor coil is larger than the initial temperature of the indoor coil, the fact that the exhaust temperature of the air conditioning system is too low at the moment and the quantity of refrigerants in the air conditioning system is too much is shown, the liquid storage pipeline is connected into the refrigerant circulation main system pipeline, redundant refrigerants in the refrigerant circulation main system pipeline can be stored into the replaceable hot gas-liquid separator for standby, and automatic storage of the redundant refrigerants is achieved.
Further, after the step S4, the method further includes:
step S5: and continuously detecting the real-time exhaust temperature, the real-time outdoor environment temperature and the real-time indoor coil temperature, and controlling the air conditioning system to operate according to a set refrigeration mode when the conditions that the air supplementing pipeline is connected into the refrigerant circulation main system pipeline and the conditions that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline are not met.
Therefore, whether the quantity of the refrigerants in the air conditioning system is insufficient or redundant is judged by continuously detecting the real-time exhaust temperature, the outdoor environment temperature and the real-time temperature of the indoor coil in real time, when the quantity of the refrigerants in the air conditioning system is insufficient, the refrigerants are supplemented for the air conditioning system, when the quantity of the refrigerants in the air conditioning system is excessive, the redundant refrigerants in the air conditioning system are recovered, and the quantity of the refrigerants circulating in the air conditioning system can be automatically adjusted. Otherwise, controlling the air conditioning system to operate according to a normal refrigeration mode.
Further, the preset exhaust temperature Tds is obtained according to the real-time outdoor environment temperature Twf and a corresponding database or objective function of the preset exhaust temperature and the outdoor environment temperature prestored in the air conditioning system.
Therefore, the preset exhaust temperature can be obtained from the database or the objective function according to the real-time temperature of the outdoor environment, and then the real-time exhaust temperature is compared with the preset exhaust temperature.
Furthermore, the refrigerant circulation main system pipeline also comprises a compressor exhaust pipeline, a pressurization pipeline is connected between the compressor exhaust pipeline and the replaceable hot gas-liquid separator, a first electromagnetic valve is arranged on the pressurization pipeline, a third electromagnetic valve is arranged on the air supplement pipeline, and the first electromagnetic valve and the second electromagnetic valve are used for controlling whether the air supplement pipeline is communicated with the refrigerant circulation main system pipeline or not.
Therefore, through the arrangement of the pressurization pipeline, the pressure in the replaceable hot gas-liquid separator can be increased, the gaseous refrigerant in the replaceable hot gas-liquid separator can conveniently enter the compressor through the gas supplementing pipeline, and the control mode of the electromagnetic valve is simple, reliable and convenient.
Furthermore, a flash evaporator is further arranged on the refrigerant circulation main system pipeline, a refrigerant outlet of the flash evaporator is connected with the replaceable hot gas-liquid separator through a pressure reducing pipeline, a second electromagnetic valve is arranged on the pressure reducing pipeline, a fourth electromagnetic valve is arranged on the liquid storage pipeline, and the second electromagnetic valve and the fourth electromagnetic valve are used for controlling whether the liquid storage pipeline is communicated with the refrigerant circulation main system pipeline or not.
Therefore, through the arrangement of the pressure reduction pipeline, the pressure in the replaceable hot gas-liquid separator can be reduced, and the redundant liquid refrigerant in the main refrigerant circulation system pipeline can be conveniently stored in the replaceable hot gas-liquid separator.
The present invention also provides a control device for automatically supplementing liquid feeding amount in a refrigeration mode, comprising:
the detection unit is used for detecting whether the air conditioning system is electrified for the first time;
an acquisition unit: the acquisition unit is used for acquiring real-time exhaust temperature, real-time outdoor environment temperature, real-time indoor coil temperature and initial indoor coil temperature;
a calculation unit: the calculation unit is used for calculating preset exhaust temperature according to the real-time temperature of the outdoor environment;
the control unit is used for controlling the air supplementing pipeline or the liquid storage pipeline of the air conditioning system to be communicated with the refrigerant circulation main system pipeline according to the real-time exhaust temperature, the real-time outdoor environment temperature, the real-time indoor coil temperature, the preset exhaust temperature and the initial indoor coil temperature;
the control unit is also used for controlling whether the air conditioning system enters a debugging stage or not according to whether the air conditioning system is electrified for the first time or not;
the control unit is also used for controlling the air conditioning system to operate according to a set refrigeration mode.
The invention also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and the computer program is read by the processor and runs to realize the control method for automatically supplementing the liquid charging amount in the refrigeration mode.
The invention also provides a computer readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the computer program realizes the control method for automatically supplementing the liquid charging amount in the refrigeration mode.
Compared with the prior art, the control device and the air conditioner for automatically supplementing the liquid adding quantity in the refrigeration mode have the same beneficial effects as the control method for automatically supplementing the liquid adding quantity in the refrigeration mode, and are not repeated herein.
Drawings
FIG. 1 is a flow chart of the control method for automatically supplementing the liquid feeding amount in the refrigeration mode according to the present invention;
FIG. 2 is a schematic diagram of refrigerant cycle control in the cooling mode according to an embodiment of the present invention;
FIG. 3 is a flowchart of a control method for automatically replenishing liquid in the cooling mode according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of an interchangeable hot gas-liquid separator according to an embodiment of the present invention.
Description of reference numerals:
1-a compressor; 2-a condenser; 3-an evaporator; 4-replaceable hot gas-liquid separator; 5-a flash tank; 6-a first overlength connecting pipe; 7-a second overlength connecting pipe; a 8-four-way valve; 9-a first solenoid valve; 10-a second solenoid valve; 11-a third solenoid valve; 12-a fourth solenoid valve;
41-inner cavity cylinder body; 42-upper thin-wall heat exchange coil; 43-lower thin-wall heat exchange coil; 44-air outlet; 45-liquid inlet; 46-a first outlet end; 47-a first inlet port; 48-a second inlet end; 49-second outlet end.
Detailed Description
The air conditioning unit sometimes can be used for installing in the application scene of overlength connecting pipe, and the liquid measure after the installation of overlength connecting pipe can't be satisfied to the liquid measure that the air conditioning unit leaves the factory this moment, need follow outside refrigerant jar replenishment liquid measure when after-sales installation. In addition, in the conventional operation process of the unit, the conventional refrigerant circulating system lacks a good automatic refrigerant quantity adjusting mechanism, so that the refrigerant quantity in the air conditioning unit is deviated from the optimal refrigerant quantity, the air conditioning unit cannot operate in the optimal state, and the refrigerating or heating effect of the air conditioner is influenced.
In order to solve the problems, the invention provides a method and a device for adjusting the amount of refrigerant in the operation process of an air conditioner. The automatic adjustment of the refrigerant quantity can be carried out in the refrigeration and/or heating modes of the air conditioner, and the pipeline setting and the control method of the refrigerant circulating system of the air conditioner are different in different modes. The invention provides a control method capable of automatically supplementing liquid feeding amount in an air-conditioning refrigeration mode, which aims to solve the problem that the refrigerant liquid amount cannot be automatically adjusted and corrected.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, the present invention provides a method for controlling an automatic liquid filling amount supplement in a refrigeration mode, comprising the steps of:
step S1, when the air conditioning system is started in the refrigeration mode, judging whether the air conditioning system is powered on for the first time, if so, controlling the air conditioning system to enter a debugging stage, otherwise, directly entering step S2;
step S2, controlling the air conditioning system to start the compressor 1, the indoor fan and the outdoor fan, and enabling the air conditioning system to operate according to a set refrigeration mode;
step S3, after the air conditioning system operates for a first preset time, continuously detecting and recording the real-time exhaust temperature Td and the real-time outdoor environment temperature Twf, and judging whether to continuously detect the real-time indoor coil temperature Te according to whether the air conditioning system is powered on for the first time;
step S4, controlling a gas supplementing pipeline or a liquid storage pipeline of the air conditioning system to be communicated with a refrigerant circulation main system pipeline according to the real-time exhaust temperature Td, the real-time outdoor environment temperature Twf, the real-time indoor coil temperature Te, the preset exhaust temperature Tds and the initial indoor coil temperature;
the air conditioning system comprises an interchangeable hot gas-liquid separator 4 selectively communicated with a refrigerant circulation main system pipeline, the refrigerant circulation main system pipeline comprises a compressor 1 gas return pipeline and a condenser 2 outlet pipeline, two ends of a gas supply pipeline are respectively connected with gas outlets of the compressor 1 gas return pipeline and the interchangeable hot gas-liquid separator 4, and two ends of a liquid storage pipeline are respectively connected with a liquid inlet of the condenser 2 outlet pipeline and an interchangeable hot gas-liquid separator 4.
In the cooling mode, as shown in fig. 2, the air conditioning system includes a compressor 1, a four-way valve 8, a condenser 2, a throttling part, a first ultra-long connecting pipe 6, an evaporator 3, a second ultra-long connecting pipe 7, and a main refrigerant circulation system pipeline for connecting the above components, which are connected in sequence, along a refrigerant flow direction.
In this embodiment, after the air conditioning system operates in the set cooling mode, whether the amount of refrigerant in the air conditioning system is insufficient or excessive is determined by comparing the real-time exhaust temperature Td with the preset exhaust temperature Tds and comparing the real-time indoor coil temperature Te with the initial indoor coil temperature. Through set up interchangeable vapour and liquid separator 4 in air conditioning system, and form gas supply pipeline and liquid storage pipeline between the main system pipeline of refrigerant circulation, save a proper amount refrigerant in interchangeable vapour and liquid separator 4 in advance, link into main system pipeline of refrigerant circulation through control gas supply pipeline or liquid storage pipeline, realize the refrigerant volume among the automatically regulated air conditioning system, make the refrigerant be in best refrigerant volume, need not professional and carry out the liquid feeding operation, avoid the refrigerant to fill the risk of revealing that exists, improve air conditioning system's refrigeration effect.
Preferably, a third electromagnetic valve 11 is arranged on the gas supplementing pipeline, and the third electromagnetic valve 11 is used for controlling whether the gaseous refrigerant in the interchangeable hot gas-liquid separator 4 is supplemented into the refrigerant circulation main system pipeline. The liquid storage pipeline is provided with a fourth electromagnetic valve 12, and the fourth electromagnetic valve 12 is used for controlling whether the liquid refrigerant in the refrigerant circulation main system pipeline is recycled and enters the replaceable hot gas-liquid separator 4. The third electromagnetic valve 11 and the fourth electromagnetic valve 12 are both in a normally closed state.
Preferably, when it is detected that the air conditioning system is powered on for the first time, the air conditioning system is debugged. The specific debugging process comprises the following steps: the indoor fan operates according to the set rotating speed, the compressor 1 and the outdoor fan do not operate in a power-on mode, the third electromagnetic valve 11 and the fourth electromagnetic valve 12 are completely opened, and the air-conditioning system operates for a fixed time. The fixed time is preferably 30 s.
Because the air conditioning system is provided with the ultra-long connecting pipe, the air supply pipeline and the liquid storage pipeline are simultaneously connected into the refrigerant circulation main system pipeline in the debugging stage so as to balance the pipeline pressure and enable the refrigerant in the air conditioning system to circulate.
It should be noted that, after the fixed time is debugged, the indoor fan still operates at the set rotation speed, and both the third electromagnetic valve 11 and the fourth electromagnetic valve 12 are closed. And then, step S2 is executed, the outdoor fan is started, the compressor 1 is powered on to operate, it should be noted that the indoor fan is started at this time, and the air conditioning system operates according to the set refrigeration mode. And when detecting that the air conditioning system is not powered on for the first time, directly starting the indoor fan and the outdoor fan in step S2, controlling the compressor 1 to be powered on, and enabling the air conditioning system to operate according to the set refrigeration mode.
As shown in fig. 3, in some embodiments, the air conditioning system is first powered on, and the real-time exhaust temperature Td and the real-time outdoor environment temperature Twf are continuously detected and recorded in step S3;
at this time, step S4 specifically includes:
when the real-time exhaust temperature Td is greater than the preset exhaust temperature Tds and lasts for a second preset time, the condition that the air supply pipeline is connected into the refrigerant circulation main system pipeline is met, and the air conditioning system is controlled to connect the air supply pipeline into the refrigerant circulation main system pipeline;
and when the real-time exhaust temperature Td is less than the preset exhaust temperature Tds and lasts for a second preset time, the condition that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline is met, and the air conditioning system is controlled to connect the liquid storage pipeline into the refrigerant circulation main system pipeline.
Wherein the second preset time is preferably 10 s. The preset exhaust temperature Tds is obtained according to the real-time outdoor environment temperature Twf and a corresponding database or objective function of the outdoor environment temperature and the preset exhaust temperature Tds prestored in the air conditioning system. The correspondence relationship between the outdoor temperature and the target exhaust real-time temperature Td in the present embodiment is shown in table 1:
TABLE 1
Figure BDA0002320545120000091
In other embodiments, as shown in fig. 3, the air conditioning system is not first powered on, and the real-time exhaust temperature Td, the real-time outdoor environment temperature Twf and the real-time indoor coil temperature Te are continuously detected and recorded in step S3.
At this time, step S4 specifically includes:
when the exhaust real-time temperature Td is greater than the preset exhaust temperature Tds, or the real-time temperature Te of the indoor coil is less than or equal to the initial temperature of the indoor coil, and the duration time is greater than or equal to a second preset time, the condition that the air supplementing pipeline is connected into the refrigerant circulation main system pipeline is met, and the air conditioning system is controlled to connect the air supplementing pipeline into the refrigerant circulation main system pipeline;
when the exhaust real-time temperature Td is smaller than the preset exhaust temperature Tds, the indoor coil real-time temperature Te is larger than the indoor coil initial temperature, and the duration time is longer than or equal to the second preset time, the condition that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline is met, and the air conditioning system is controlled to connect the liquid storage pipeline into the refrigerant circulation main system pipeline.
Optionally, after step S4, step S5 is further included. If the air conditioning system is powered on for the first time, step S5 is:
continuously detecting the real-time exhaust temperature Td and the real-time outdoor environment temperature Twf, and comparing the real-time exhaust temperature Td with a preset exhaust temperature Tds;
and controlling the air conditioning system to operate according to a set refrigeration mode until the conditions that the air supplementing pipeline is connected into the refrigerant circulation main system pipeline and the conditions that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline are not met.
The condition that the air supplementing pipeline is not connected into the refrigerant circulation main system pipeline nor the condition that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline is taken as an example for explanation, when the exhaust real-time temperature Td is detected to be less than the preset exhaust temperature Tds and the duration is less than the second preset time, or the exhaust real-time temperature Td is detected to be greater than the preset exhaust temperature Tds and the duration is less than the second preset time, the connection between the air supplementing pipeline and the refrigerant circulation main system pipeline is disconnected at the moment, and the air conditioning system is controlled to operate according to the set refrigeration mode.
If the exhaust real-time temperature Td is detected to be less than the preset exhaust temperature Tds and the duration time is greater than or equal to the second preset time, the air conditioning system is controlled to disconnect the air supplementing pipeline and the refrigerant circulation main system pipeline, and the liquid storage pipeline is connected into the refrigerant circulation main system pipeline.
If the air conditioning system is not powered on for the first time, step S5 is:
comparing the magnitude of the exhaust real-time temperature Td with the preset exhaust temperature Tds and the magnitude of the indoor coil real-time temperature Te with the initial temperature of the indoor coil according to the continuously detected exhaust real-time temperature Td, the outdoor environment real-time temperature Twf and the indoor coil real-time temperature Te;
and when the condition that the air supplementing pipeline is connected into the refrigerant circulation main system pipeline is not met, and the condition that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline is not met, controlling the air conditioning system to operate according to a set refrigeration mode. Such as: and when the real-time temperature of the indoor coil is detected to be higher than the initial temperature of the indoor coil but the duration time is shorter than a second preset time, controlling the air conditioning system to enter a set refrigeration mode. It should be understood that, after the solenoid valve is closed in fig. 3, the air conditioning system is controlled to operate in the set refrigeration mode after neither the condition that the air supplement pipeline is connected to the refrigerant circulation main system pipeline nor the condition that the liquid storage pipeline is connected to the refrigerant circulation main system pipeline is satisfied.
Preferably, as shown in fig. 4, the hot-gas-liquid exchangeable separator 4 includes a liquid reservoir, an inner cavity cylinder 41 is disposed in the liquid reservoir, the inner cavity rigid body is used for storing a refrigerant, an air outlet 44 and a liquid inlet 45 are disposed at the top of the liquid reservoir, and both the air outlet 44 and the liquid inlet 45 are communicated with the inner cavity cylinder 41. The outer wall of the inner cavity cylinder 41 is provided with two heat exchange coils which are separated up and down, namely an upper thin-wall heat exchange coil 42 and a lower thin-wall heat exchange coil 43, the upper thin-wall heat exchange coil 42 is provided with a first inlet end 47 and a first outlet end 46, the first inlet end 47 is communicated with the first outlet end 46, the lower thin-wall heat exchange coil 43 is provided with a second inlet end 48 and a second outlet end 49, and the second inlet end 48 is communicated with the second outlet end 49.
Preferably, the refrigerant circulation main system pipeline further comprises a compressor 1 exhaust pipeline, a pressure increasing pipeline is connected between the compressor 1 exhaust pipeline and the second inlet end 48 of the exchangeable hot gas-liquid separator 4, a first electromagnetic valve 9 is arranged on the pressure increasing pipeline, and the first electromagnetic valve 9 is used for controlling whether a part of a high-temperature high-pressure gaseous refrigerant compressed by the compressor 1 enters the exchangeable hot gas-liquid separator 4 or not so as to exchange heat with a liquid refrigerant in the exchangeable hot gas-liquid separator 4.
Preferably, the air conditioning system further comprises a flash tank 5, the flash tank 5 has three interfaces, which are respectively a first interface arranged at one end of the flash tank 5, a second interface and a third interface arranged at the other end of the flash tank 5, the first interface is a refrigerant outlet, the first interface of the flash tank 5 is connected with the first inlet end 47 of the replaceable hot gas-liquid separator 4 through a pressure reduction pipeline, and the second interface and the third interface of the flash tank 5 are arranged on a pipeline between the condenser 2 and the evaporator 3. Further, a second electromagnetic valve 10 is arranged on the pressure reducing pipeline, and the second electromagnetic valve 10 is used for controlling whether the flash steam in the flash tank 5 enters the replaceable hot gas-liquid separator 4 or not. The first electromagnetic valve 9 and the second electromagnetic valve 10 are both in a normally closed state.
In this embodiment, when the detected real-time exhaust temperature Td is greater than or equal to the preset exhaust temperature Tds, or the real-time indoor coil temperature is less than or equal to the initial indoor coil temperature, it indicates that the real-time exhaust temperature Td of the air conditioning system is high at this time, the amount of refrigerant in the air conditioning system is insufficient, the refrigerant stored in the replaceable hot gas-liquid separator 4 needs to be supplemented into the refrigerant circulation main system pipeline, at this time, the first electromagnetic valve 9 and the third electromagnetic valve 11 are opened, and the second electromagnetic valve 10 and the fourth electromagnetic valve 12 are kept closed, so that the air supplementing pipeline can be connected into the refrigerant circulation main system pipeline.
When the detected exhaust real-time temperature Td is smaller than the preset exhaust temperature Tds, or when the detected exhaust real-time temperature Td is smaller than the preset exhaust temperature Tds and the real-time temperature of the indoor coil is larger than the initial temperature of the indoor coil, it is indicated that the exhaust real-time temperature Td of the air conditioning system is too low at the moment, the amount of refrigerants in the air conditioning system is too much, redundant refrigerants in a refrigerant circulation main system pipeline need to be stored in the replaceable hot gas-liquid separator 4 for standby, at the moment, the second electromagnetic valve 10 and the fourth electromagnetic valve 12 are opened, the first electromagnetic valve 9 and the third electromagnetic valve 11 are kept closed, and the liquid storage pipeline can be connected into the refrigerant circulation main system pipeline, so.
It should be noted that, when the connection between the air supply pipeline and the refrigerant circulation main system pipeline is disconnected, the first electromagnetic valve 9 is closed first, and the third electromagnetic valve 11 is closed after 5 seconds. When the connection between the liquid storage pipeline and the refrigerant circulation main system pipeline is disconnected, the fourth electromagnetic valve 12 is closed firstly, and the second electromagnetic valve 10 is closed after 5 seconds.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (13)

1. A control method for automatically supplementing liquid feeding amount in a refrigeration mode is characterized by comprising the following steps:
step S1, when the air conditioning system is started in the refrigeration mode, judging whether the air conditioning system is powered on for the first time, if so, controlling the air conditioning system to enter a debugging stage, and if not, entering step S2;
step S2, controlling the air conditioning system to start a compressor (1), an indoor fan and an outdoor fan, wherein the air conditioning system operates according to a set refrigeration mode;
step S3, after the air conditioning system runs for a first preset time, according to the result of judging whether the air conditioning system is powered on for the first time in the step S1, continuously detecting and recording the real-time exhaust temperature and the real-time outdoor environment temperature, or continuously detecting and recording the real-time exhaust temperature, the real-time outdoor environment temperature and the real-time indoor coil temperature;
step S4, controlling a gas supplementing pipeline or a liquid storage pipeline of the air conditioning system to be communicated with a refrigerant circulation main system pipeline according to the real-time exhaust temperature, the real-time outdoor environment temperature, the real-time indoor coil temperature, the preset exhaust temperature and the initial indoor coil temperature;
the air conditioning system comprises a replaceable hot gas-liquid separator (4) selectively communicated with a refrigerant circulation main system pipeline, the refrigerant circulation main system pipeline comprises a compressor (1) air return pipeline and a condenser outlet pipeline, two ends of the air supply pipeline are respectively connected with the compressor (1) air return pipeline and an air outlet of the replaceable hot gas-liquid separator (4), and two ends of the liquid storage pipeline are respectively connected with the condenser outlet pipeline and a liquid inlet of the replaceable hot gas-liquid separator (4).
2. The method for controlling automatic replenishment of a liquid charge in a refrigeration mode of claim 1, wherein the commissioning phase specifically comprises: and controlling the indoor fan to operate at a set rotating speed, keeping the compressor (1) and the outdoor fan not powered on to operate, and operating the air conditioning system for a fixed time after the air supplementing pipeline and the liquid storage pipeline are simultaneously connected into the refrigerant circulation main system pipeline.
3. The method for controlling automatic replenishment in a refrigeration mode according to claim 1, wherein step S3 specifically comprises:
when the air conditioning system is powered on for the first time, continuously detecting and recording the real-time exhaust temperature and the real-time outdoor environment temperature;
when the air conditioning system is not powered on for the first time, the real-time exhaust temperature, the real-time outdoor environment temperature and the real-time indoor coil temperature are continuously detected and recorded.
4. The method as claimed in claim 1, wherein when the air conditioning system is powered on for the first time, the conditions for controlling the air supply pipeline to be connected to the refrigerant circulation main system pipeline in step S4 are as follows: the real-time exhaust temperature is greater than the preset exhaust temperature, and the duration time is greater than or equal to a second preset time;
the conditions for controlling the liquid storage pipeline to be connected into the refrigerant circulation main system pipeline are as follows: the real-time exhaust temperature is less than the preset exhaust temperature, and the duration time is greater than or equal to a second preset time.
5. The method for controlling automatic replenishment in a refrigeration mode according to claim 4, further comprising, after said step S4:
step S5: and continuously detecting the real-time exhaust temperature and the real-time outdoor environment temperature, and controlling the air conditioning system to operate according to a set refrigeration mode when the conditions that the air supplementing pipeline is connected into the refrigerant circulation main system pipeline and the conditions that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline are not met.
6. The method as claimed in claim 1, wherein when the air conditioning system is not powered on for the first time, the conditions for controlling the air supply line to be connected to the refrigerant circulation main system line in step S4 are as follows:
the real-time exhaust temperature is greater than the preset exhaust temperature, and the duration time is greater than or equal to a second preset time; or the real-time temperature of the indoor coil is less than or equal to the initial temperature of the indoor coil, and the duration time is greater than or equal to a second preset time;
the conditions for controlling the liquid storage pipeline to be connected into the refrigerant circulation main system pipeline are as follows:
the real-time exhaust temperature is less than the preset exhaust temperature, the real-time temperature of the indoor coil is greater than the initial temperature of the indoor coil, and the duration time is greater than or equal to second preset time.
7. The method for controlling automatic replenishment in a refrigeration mode according to claim 6, further comprising, after said step S4:
step S5: and continuously detecting the real-time exhaust temperature, the real-time outdoor environment temperature and the real-time indoor coil temperature, and controlling the air conditioning system to operate according to a set refrigeration mode when the conditions that the air supplementing pipeline is connected into the refrigerant circulation main system pipeline and the conditions that the liquid storage pipeline is connected into the refrigerant circulation main system pipeline are not met.
8. The method as claimed in claim 1, wherein the preset discharge temperature is obtained from the real-time outdoor environment temperature and a database or objective function of the preset discharge temperature and the outdoor environment temperature pre-stored in the air conditioning system.
9. The method for controlling automatic liquid feeding amount supplement in a refrigeration mode according to claim 1, wherein the refrigerant circulation main system pipeline further comprises a compressor exhaust pipeline, a pressurization pipeline is connected between the compressor exhaust pipeline and the replaceable hot gas-liquid separator (4), a first electromagnetic valve (9) is arranged on the pressurization pipeline, a third electromagnetic valve (11) is arranged on the gas supplementing pipeline, and the first electromagnetic valve (9) and the third electromagnetic valve (11) are used for controlling whether the gas supplementing pipeline is communicated with the refrigerant circulation main system pipeline or not.
10. The method for controlling automatic liquid feeding amount supplement in a refrigeration mode according to claim 1, wherein a flash evaporator (5) is further arranged on a refrigerant circulation main system pipeline, a refrigerant outlet of the flash evaporator (5) is connected with the hot gas-liquid exchangeable separator (4) through a pressure reducing pipeline, a second electromagnetic valve (10) is arranged on the pressure reducing pipeline, a fourth electromagnetic valve (12) is arranged on the liquid storage pipeline, and the second electromagnetic valve (10) and the fourth electromagnetic valve (12) are used for controlling whether the liquid storage pipeline is communicated with the refrigerant circulation main system pipeline or not.
11. A control device for automatically supplementing liquid feeding amount in a refrigeration mode is characterized by comprising:
the detection unit is used for detecting whether the air conditioning system is electrified for the first time;
the acquisition unit is used for acquiring exhaust real-time temperature and outdoor environment real-time temperature or acquiring exhaust real-time temperature, outdoor environment real-time temperature, indoor coil real-time temperature and indoor coil initial temperature according to the detection result of whether the air conditioning system is electrified for the first time;
the calculation unit is used for calculating preset exhaust temperature according to the real-time temperature of the outdoor environment;
the control unit is used for controlling the air supplementing pipeline or the liquid storage pipeline of the air conditioning system to be communicated with a refrigerant circulation main system pipeline according to the real-time exhaust temperature, the real-time outdoor environment temperature, the real-time indoor coil pipe temperature, the preset exhaust temperature and the initial indoor coil pipe temperature;
the control unit is also used for controlling whether the air conditioning system enters a debugging stage or not according to whether the air conditioning system is electrified for the first time or not;
the control unit is also used for controlling the air conditioning system to operate according to a set refrigeration mode.
12. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the method for controlling automatic refill in a cooling mode according to any one of claims 1 to 10.
13. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method for controlling automatic refill in refrigeration mode according to any one of claims 1 to 10.
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CN112361551B (en) * 2020-10-29 2021-10-29 珠海格力电器股份有限公司 Air conditioner control method and device, storage medium and air conditioner
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