CN114688689B - Opening degree adjusting method and device of electronic expansion valve and multi-connected air conditioner - Google Patents

Opening degree adjusting method and device of electronic expansion valve and multi-connected air conditioner Download PDF

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Publication number
CN114688689B
CN114688689B CN202210343106.6A CN202210343106A CN114688689B CN 114688689 B CN114688689 B CN 114688689B CN 202210343106 A CN202210343106 A CN 202210343106A CN 114688689 B CN114688689 B CN 114688689B
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China
Prior art keywords
expansion valve
electronic expansion
indoor unit
degree
preset value
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CN114688689A (en
Inventor
邓赛峰
刘合心
陈华
李理科
张国帅
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Anhui Aux Intelligent Electric Co ltd
Ningbo Aux Electric Co Ltd
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Anhui Aux Intelligent Electric Co ltd
Ningbo Aux Electric Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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

Abstract

The invention provides an opening degree adjusting method and device of an electronic expansion valve and a multi-connected air conditioner, and relates to the technical field of air conditioners. The opening degree adjusting method of the electronic expansion valve comprises the following steps: calculating the superheat degree of the indoor unit according to the inlet pipe temperature value and the outlet pipe temperature value; if the superheat degree is not in the interval of the first preset value and the second preset value, calculating the initial adjustment step number of the electronic expansion valve of the overheat indoor unit according to the superheat degree; acquiring the number of the overheated indoor units; calculating the target regulation step number of the overheat indoor unit according to the correction coefficient and the initial regulation step number of the overheat indoor unit; and adjusting the opening of the electronic expansion valve of the overheating indoor unit according to the target adjusting step number corresponding to the overheating indoor unit. The initial regulation step number is corrected through the quantity of the overheated indoor units to obtain the target regulation step number, so that the temperature and pressure fluctuation of the whole multi-connected air conditioner system can be reduced, the stability of the compressor is kept, the stability of the air outlet temperature of the indoor units is improved, and the comfort level of users is improved.

Description

Opening degree adjusting method and device of electronic expansion valve and multi-connected air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to an opening degree adjusting method and device of an electronic expansion valve and a multi-connected air conditioner.
Background
The multi-connected air conditioner is provided with a plurality of indoor units, each indoor unit is provided with an independent electronic expansion valve, and each electronic expansion valve is adjusted according to the temperature change of the heat exchanger of the respective indoor unit.
In general, the adjusting period of the electronic expansion valves of the indoor units matched with one outdoor unit is consistent, when the indoor units are operated simultaneously, the electronic expansion valves of the indoor units can be adjusted synchronously in the same direction, the electronic expansion valves of the indoor units are increased or decreased in opening simultaneously, the temperature, the pressure and other parameters of the system can be fluctuated, particularly when the number of the indoor units is large, the operation of the compressor is even unstable, the air outlet temperature of the indoor units can be fluctuated along with the operation of the indoor units, and the comfort is poor.
Disclosure of Invention
The invention solves the problem of how to keep the compressor running stably, and the temperature of the air outlet of the indoor unit is kept, so that the stability of the whole machine is improved.
In order to solve the problems, the invention provides an opening degree adjusting method and device of an electronic expansion valve and a multi-connected air conditioner.
In a first aspect, an embodiment of the present invention provides a method for adjusting an opening degree of an electronic expansion valve, which is applied to a multi-connected air conditioner, where the multi-connected air conditioner includes an outdoor unit and a plurality of indoor units, the indoor units are connected in parallel, the indoor units include a heat exchanger and an electronic expansion valve, the indoor units are connected with the outdoor unit through the electronic expansion valve, and the method for adjusting the opening degree of the electronic expansion valve includes:
acquiring an inlet pipe temperature value and an outlet pipe temperature value of the heat exchanger of the indoor unit under the condition of a refrigeration mode;
calculating the superheat degree of the indoor unit according to the inlet pipe temperature value and the outlet pipe temperature value;
judging whether the superheat degree is in a section of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value;
if the superheat degree is not in the interval of the first preset value and the second preset value, calculating the initial adjustment step number of the electronic expansion valve of the superheat indoor unit according to the superheat degree; wherein the overheat indoor unit represents an indoor unit in which the overheat degree is not in the interval of the first preset value and the second preset value;
acquiring the number of the overheated indoor units;
Calculating a correction coefficient according to the number of the overheated indoor units;
calculating the target regulation step number of the overheating indoor unit according to the correction coefficient and the initial regulation step number of the overheating indoor unit;
and adjusting the opening of the electronic expansion valve of the overheating indoor unit according to the target adjusting step number corresponding to the overheating indoor unit.
When the superheat degree is not in the interval of the first preset value and the second preset value, the initial adjustment step number is corrected through the quantity of the overheat indoor units to obtain the target adjustment step number, so that the temperature and pressure fluctuation of the whole multi-connected air conditioner system can be reduced, the stability of the compressor is maintained, the stability of the air outlet temperature of the indoor units is improved, and the comfort level of users is improved.
In an optional embodiment of the present invention, the step of determining whether the superheat is within a range of a first preset value and a second preset value includes:
judging whether the superheat degree is smaller than the first preset value or not;
judging whether the number of the overheating indoor units is larger than or equal to a set number;
if the superheat degree is smaller than the first preset value and the number of the superheat indoor units is greater than or equal to the set number, the step of adjusting the opening of the electronic expansion valve of the superheat indoor unit according to the target adjustment step number corresponding to the superheat indoor unit comprises the following steps:
Judging whether the target regulation step number is smaller than a first set parameter or not; and if the target regulation step number of the part of the overheating indoor units is smaller than the first setting parameter, controlling the opening degree of the electronic expansion valve of the overheating indoor unit with the target regulation step number smaller than the first setting parameter to be unchanged.
In an optional embodiment of the present invention, the step of adjusting the opening of the electronic expansion valve of the superheating indoor unit according to the target adjustment step number corresponding to the superheating indoor unit further includes:
and if the target adjustment step numbers of all the overheating indoor units with the overheating degree smaller than the first preset value are smaller than the first set parameter, reducing the opening of the corresponding electronic expansion valve according to the overheating degree of the overheating indoor units.
In an optional embodiment of the present invention, the step of adjusting the opening of the electronic expansion valve according to the superheat degree of the superheat indoor unit includes:
controlling the electronic expansion valve of the overheat indoor unit with the minimum overheat degree to reduce the corresponding initial adjustment step number;
and controlling the opening degree of the electronic expansion valve of the overheat indoor unit, of which the superheat degree is smaller than the first preset value and the target adjustment step number is smaller than the first set parameter, to be unchanged.
In an optional embodiment of the present invention, the step of controlling the electronic expansion valve of the superheating indoor unit with the minimum superheat degree to adjust the corresponding initial adjustment step number includes:
if a plurality of overheating indoor units with the superheat degree smaller than the first preset value and the superheat degree minimum exist at the same time, acquiring the indoor environment temperature value of the corresponding overheating indoor unit;
and controlling the overheat indoor unit with the lowest ambient temperature value to firstly adjust the opening of the electronic expansion valve.
In an optional embodiment of the present invention, the step of adjusting the opening of the electronic expansion valve of the superheating indoor unit according to the target adjustment step number corresponding to the superheating indoor unit further includes:
and controlling the electronic expansion valve of the overheat indoor unit, of which the superheat degree is smaller than the first preset value and the target adjustment step number is larger than or equal to the first set parameter, to reduce the target adjustment step number.
In an optional embodiment of the present invention, the step of determining whether the superheat is within a range of a first preset value and a second preset value includes:
judging whether the superheat degree is larger than the second preset value or not;
judging whether the number of the overheating indoor units is larger than or equal to a set number;
If the superheat degree is greater than the second preset value and the number of the overheated indoor units is greater than or equal to the set number, the step of adjusting the opening of the electronic expansion valve of the overheated indoor unit according to the target adjustment step number corresponding to the overheated indoor unit includes:
judging whether the target regulation step number is smaller than a second set parameter;
and if the target adjustment step number of part of the overheating indoor units is smaller than the second setting parameter, controlling the opening degree of the electronic expansion valve of the overheating indoor units with the target adjustment step number smaller than the second setting parameter to be unchanged.
In an optional embodiment of the present invention, the step of adjusting the opening of the electronic expansion valve of the superheating indoor unit according to the target adjustment step number corresponding to the superheating indoor unit further includes:
and if the target adjustment step numbers of all the overheating indoor units with the overheating degree larger than the second preset value are smaller than the second set parameter, adjusting the opening of the corresponding electronic expansion valve according to the overheating degree of the overheating indoor units.
In an optional embodiment of the present invention, the step of adjusting the opening of the electronic expansion valve according to the superheat degree of the superheat indoor unit includes:
Controlling the electronic expansion valve of the overheat indoor unit with the maximum overheat degree to increase the corresponding initial adjustment step number;
and controlling the opening degree of the electronic expansion valve of the overheat indoor unit, of which the superheat degree is larger than the second preset value and the target adjustment step number is smaller than the second set parameter, to be unchanged.
In an optional embodiment of the present invention, the step of controlling the electronic expansion valve of the indoor unit with the maximum superheat degree to adjust the corresponding initial adjustment step number includes:
if a plurality of overheating indoor units with the superheat degree larger than the second preset value and the superheat degree minimum exist at the same time, acquiring the indoor environment temperature value of the corresponding overheating indoor unit;
and controlling the overheat indoor unit with the highest ambient temperature value to firstly adjust the opening of the electronic expansion valve.
In an optional embodiment of the present invention, the step of adjusting the opening of the electronic expansion valve of the superheating indoor unit according to the target adjustment step number corresponding to the superheating indoor unit further includes:
and controlling the electronic expansion valve of the overheat indoor unit, wherein the overheat degree is larger than the second preset value, and the target adjustment step number is larger than or equal to the second set parameter, so as to increase the target adjustment step number.
In an alternative embodiment of the present invention, the method for adjusting the opening degree of the electronic expansion valve includes:
if the superheat degree is smaller than the first preset value, controlling the opening degree of the corresponding electronic expansion valve to be reduced;
if the superheat degree is larger than the second preset value, controlling the opening degree of the corresponding electronic expansion valve to be increased;
and if the superheat degree is larger than or equal to a first preset value and smaller than or equal to a second preset value, controlling the opening degree of the corresponding electronic expansion valve to be unchanged.
In a second aspect, an embodiment of the present invention provides an opening adjustment device of an electronic expansion valve, which is applied to a multi-connected air conditioner, where the multi-connected air conditioner includes an outdoor unit and a plurality of indoor units, the indoor units are connected in parallel, the indoor units include a heat exchanger and an electronic expansion valve, the indoor units are connected with the outdoor unit through the electronic expansion valve, and the opening adjustment device of the electronic expansion valve includes:
the first acquisition module is used for acquiring an inlet pipe temperature value and an outlet pipe temperature value of the heat exchanger of the indoor unit under the condition of a refrigeration mode;
the first calculation module is used for calculating the superheat degree of the indoor unit according to the inlet pipe temperature and the outlet pipe temperature value;
The judging module is used for judging whether the superheat degree is in a section of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value;
the second calculation module is used for calculating the initial adjustment step number of the electronic expansion valve of the overheat indoor unit according to the overheat degree if the overheat degree is not in the interval of the first preset value and the second preset value; wherein the overheat indoor unit represents an indoor unit in which the overheat degree is not in the interval of the first preset value and the second preset value;
the second acquisition module is used for acquiring the number of the overheated indoor units;
the third calculation module is used for calculating a correction coefficient according to the number of the overheated indoor units;
a fourth calculation module, configured to calculate a target adjustment step number of the overheating indoor unit according to the correction coefficient and the initial adjustment step number of the overheating indoor unit;
and the control module is used for adjusting the opening of the electronic expansion valve of the overheating indoor unit according to the target adjusting step number corresponding to the overheating indoor unit.
In a third aspect, an embodiment of the present invention provides a multi-connected air conditioner, including a controller, where the controller is configured to execute a computer instruction to implement the method for adjusting the opening of the electronic expansion valve provided in the first aspect.
Drawings
Fig. 1 is a schematic structural diagram of a multi-connected air conditioner according to an embodiment of the present invention.
Fig. 2 is a flowchart of a method for adjusting an opening degree of an electronic expansion valve according to a first embodiment of the present invention.
Fig. 3 is a partial flowchart of a method for adjusting an opening degree of an electronic expansion valve according to a second embodiment of the present invention.
Fig. 4 is a flowchart of the sub-step of step S350 of the opening adjustment method of the electronic expansion valve according to the second embodiment of the present invention.
Fig. 5 is a partial flowchart of a method for adjusting the opening of an electronic expansion valve according to a second embodiment of the present invention.
Fig. 6 is a flowchart of the sub-steps of step S450 of the opening adjustment method of the electronic expansion valve according to the second embodiment of the present invention.
Fig. 7 is a block diagram of an opening adjusting device of an electronic expansion valve according to an embodiment of the present invention.
Reference numerals illustrate:
10-multi-connected air conditioner; 11-an indoor unit; 12-a heat exchanger; 13-an electronic expansion valve; 14-a tube inlet temperature sensor; 15-an outlet tube temperature sensor; 16-an ambient temperature sensor; 17-an overheated indoor unit; 20-an opening degree adjusting device of the electronic expansion valve; 21-a first acquisition module; 22-a first calculation module; 23-judging module; 24-a second calculation module; 25-a second acquisition module; 26-a third calculation module; 27-a fourth calculation module; 28-control module.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
First embodiment
Referring to fig. 1, the present embodiment provides a method for adjusting the opening of an electronic expansion valve 13, where the method for adjusting the opening of the electronic expansion valve 13 provided in the present embodiment is mainly applied to a multi-connected air conditioner 10, and the method for adjusting the opening of the electronic expansion valve 13 provided in the present embodiment can reduce the temperature and pressure fluctuation of the whole multi-connected air conditioner 10 system, maintain the stability of a compressor, and improve the stability of the air outlet temperature of an indoor unit 11, so as to improve the comfort of a user.
The multi-connected air conditioner 10 includes an outdoor unit and a plurality of indoor units 11, the plurality of indoor units 11 are connected in parallel, the indoor units 11 include a heat exchanger 12 and an electronic expansion valve 13, and the indoor units 11 are connected with the outdoor unit through the electronic expansion valve 13. The indoor unit 11 further includes an inlet pipe temperature sensor 14, an outlet pipe temperature sensor 15, an ambient temperature sensor 16, and a controller, and the inlet pipe temperature sensor 14, the outlet pipe temperature sensor 15, and the ambient temperature sensor 16 are all electrically connected to the controller. The inlet pipe temperature value sensor is arranged on an inlet pipe of the refrigerant and used for detecting the inlet pipe temperature value. The outlet pipe temperature sensor 15 is disposed on the refrigerant outflow pipe, and is used for detecting an outlet pipe temperature value. The ambient temperature sensor 16 is used to detect an ambient temperature value. The controller receives the inlet pipe temperature value, the outlet pipe temperature value and the ambient temperature value and then executes the opening adjustment method of the electronic expansion valve 13.
Referring to fig. 2, the specific flow of the method for adjusting the opening of the electronic expansion valve 13 provided in this embodiment is as follows:
step S11, acquiring the inlet pipe temperature value and the outlet pipe temperature value of the heat exchanger 12 of the indoor unit 11 under the condition of the cooling mode.
The opening adjustment method of the electronic expansion valve 13 provided in this embodiment is mainly applied to a refrigeration mode, and obtains the inlet pipe temperature value and the outlet pipe temperature value of the heat exchanger 12 of each indoor unit 11 when the multi-connected air conditioner 10 operates in the refrigeration mode.
Step S12, calculating the superheat degree of the indoor unit 11 according to the inlet pipe temperature value and the outlet pipe temperature value.
In this embodiment, the superheat degree of each indoor unit 11 is calculated according to the inlet pipe temperature value and the outlet pipe temperature value, and the outlet pipe temperature value is subtracted by the inlet pipe temperature value.
It will be readily appreciated that the conditions of each indoor unit 11 are the same, and the superheat degree of each indoor unit is subtracted from the pipe inlet temperature value.
Step S13, judging whether the superheat degree is in a section of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value.
In this embodiment, the interval formed by the first preset value and the second preset value is an interval in which the multi-connected air conditioner 10 can stably operate, and if the superheat degree is smaller than the first preset value, the superheat degree is too small, and the refrigerant of the indoor unit 11 is not evaporated sufficiently, so that liquid return is easy to occur, which causes hidden danger to the operation of the compressor. If the superheat degree is greater than the second preset value, it indicates that the refrigerant flow is insufficient and the refrigeration effect is poor, so that it is necessary to determine whether the superheat degree is within a range from the first preset value to the second preset value, thereby determining whether the multi-unit air conditioner 10 is operating normally.
Wherein the first preset value is-1 ℃. The second preset value is 2-5 ℃.
Step S14, if the superheat degree is not within the interval of the first preset value and the second preset value, calculating the initial adjustment step number of the electronic expansion valve 13 of the superheat indoor unit 17 according to the superheat degree. The overheated indoor unit 17 is an indoor unit 11 whose degree of superheat is not within a range of the first preset value and the second preset value.
In this embodiment, after the superheat degree is not within the interval of the first preset value and the second preset value, the initial adjustment step number of the electronic expansion valve 13 of the superheat indoor unit 17 needs to be calculated, and the initial adjustment step number of the electronic expansion valve 13 of the superheat indoor unit 17 is adjusted, so as to adjust the flow rate of the refrigerant of the indoor unit 11, and ensure the normal use of the multi-connected air conditioner 10.
For convenience of description, the indoor unit 11 having a superheat degree not within the interval of the first preset value and the second preset value is defined as the superheat indoor unit 17.
If the superheat degree is not within the interval of the first preset value and the second preset value, the initial adjustment step number of the electronic expansion valve 13 of the superheat indoor unit 17 is calculated, specifically as follows:
wherein the method comprises the steps ofOpening degree of electronic expansion valve 13 for j-th indoor unit 11, >The opening of the electronic expansion valve 13 for the previous adjustment cycle is +_ if the current adjustment cycle is the first adjustment cycle>The value of S0 is determined according to the characteristics of the electronic expansion valve 13 and the maximum allowable opening, wherein the value of S0 is the initial opening S0 (preferably 100-300 pls); a1 and a2 are calculation coefficients (for example, 5-20) and can be different values, and are determined by test effects; t0 is a preset target superheat degree (preferably 0-5 ℃), and TA is more than or equal to T0 and less than or equal to TB.
In step S15, the number of overheated indoor units 17 is acquired.
In the present embodiment, the degree of superheat of the plurality of indoor units 11 is calculated one by one in the manner of step S11 to step S14, and the number of indoor units 11, i.e., the overheated indoor units 17, whose degree of superheat is not within the first preset value and the second preset value interval is calculated.
In step S16, a correction coefficient is calculated based on the number of overheated indoor units 17.
In this embodiment, the number of the overheating indoor units 17 is different, the adjustment manners of the electronic expansion valves 13 are different, if the number of the overheating indoor units 17 is larger, and in general, more than 2 overheating indoor units 17 are used, that is, the number of the overheating indoor units 17 is considered to be larger, then the electronic expansion valves 13 of the plurality of overheating indoor units 17 are simultaneously adjusted to cause flow fluctuation of the whole machine, so that the frequency of the compressor fluctuates, a correction coefficient is calculated according to the number of the overheating indoor units 17, and the initial adjustment step number is corrected according to the correction coefficient, so that the stability of the movement of the whole machine can be ensured.
The correction factor is calculated according to the following formula:
n=k0×n and n≡1. Wherein N is the number of the overheating indoor units 17, k0 is a proportionality coefficient, and the value is generally 0-1. n is a correction coefficient. It should be noted that the range of k0 values is different under the two conditions that the superheat degree is smaller than the first preset value and the superheat degree is larger than the second preset value.
Step S17, calculating the target regulation step number of the overheat indoor unit 17 according to the correction coefficient and the initial regulation step number of the overheat indoor unit 17.
In this embodiment, the target adjustment step number of the superheating indoor unit 17 can be calculated according to the correction coefficient and the initial adjustment step number of the superheating machine, so as to adjust the opening of the electronic expansion valve 13 of the superheating indoor unit 17.
Calculating a target adjustment step number according to the following formula:
S(j) 0 =s (j)/n, where S (j) is the initial number of adjustment steps, S (j) 0 The number of steps is adjusted for the target.
Step S18, adjusting the opening of the electronic expansion valve 13 of the superheating indoor unit 17 according to the target adjustment step number corresponding to the superheating indoor unit 17.
In the present embodiment, the opening degree of the electronic expansion valve 13 of each overheated indoor unit 17 is adjusted according to the target adjustment step number corresponding to the overheated indoor unit 17.
It is easy to understand that if the degree of superheat is smaller than the first preset value, the opening of the corresponding electronic expansion valve 13 is controlled to be reduced; if the superheat degree is larger than the second preset value, controlling the opening degree of the corresponding electronic expansion valve 13 to be increased; if the superheat degree is greater than or equal to the first preset value and less than or equal to the second preset value, the opening degree of the corresponding electronic expansion valve 13 is controlled to be unchanged.
If the superheat degree is smaller than the first preset value, it indicates that the evaporation of the refrigerant is insufficient, and the flow rate of the refrigerant is large, and the opening of the electronic expansion valve 13 needs to be reduced. If the superheat degree is greater than the second preset value, it indicates that the current refrigerant flow is smaller and the refrigerant is smaller, and the opening degree of the electronic expansion valve 13 needs to be increased.
According to the opening degree adjusting method of the electronic expansion valve 13 provided by the embodiment, when the superheat degree is not in the interval of the first preset value and the second preset value, the initial adjusting step number is corrected through the number of the overheated indoor units 17 to obtain the target adjusting step number, so that the fluctuation of the temperature and the pressure of the whole multi-connected air conditioner 10 system can be reduced, the stability of the compressor is kept, the stability of the air outlet temperature of the indoor units 11 is improved, and the comfort degree of a user is improved.
Second embodiment
The embodiment provides a method for adjusting the opening of an electronic expansion valve 13, which can reduce the temperature and pressure fluctuation of the whole multi-connected air conditioner 10 system, maintain the stability of a compressor, and improve the stability of the air outlet temperature of an indoor unit 11 so as to improve the comfort of users.
Referring to fig. 3, in step S100, the inlet pipe temperature value and the outlet pipe temperature value of the heat exchanger 12 of the indoor unit 11 are obtained under the condition of the cooling mode.
In the present embodiment, the working process and working principle of step S100 are the same as those of step S11 in the first embodiment, and reference may be made to step S11, which is not repeated here.
Step S200, calculating the superheat degree of the indoor unit 11 according to the inlet pipe temperature value and the outlet pipe temperature value.
Similarly, the working procedure and the working principle of step S200 are the same as those of step S12 in the first embodiment, and reference is made to step S12, which is not repeated here.
Step S310, determining whether the superheat degree is smaller than a first preset value, and determining whether the number of the overheated indoor units is greater than or equal to a set number.
In this embodiment, whether the degree of superheat is smaller than a first preset value is determined, and the first preset value is the same as the first preset value in the first embodiment, and whether the degree of superheat is smaller than the first preset value is determined, so that whether the refrigerant of the indoor unit 11 is insufficiently evaporated and liquid return occurs can be determined, which causes hidden danger to the operation of the compressor.
If the number of the overheat indoor units 17 is set to 2, that is, if the number of the overheat indoor units 17 is considered to be greater than 2, the electronic expansion valves 13 of the overheat indoor units 17 are simultaneously adjusted to cause flow fluctuation of the whole machine, so that frequency fluctuation of the compressor is caused.
In step S320, if the superheat degree is smaller than the first preset value, and if the number of the superheat indoor units 17 is greater than or equal to the set number, it is determined whether the target adjustment step number is smaller than the first set parameter.
In this embodiment, if the superheat degree is smaller than the first preset value, it is indicated that the superheat degree is too small, and the refrigerant of the indoor unit 11 is not evaporated sufficiently, so that liquid return is easy to occur, which causes a hidden trouble to the operation of the compressor. If the degree of superheat is smaller than the first preset value, it is necessary to further determine whether the target adjustment parameter is smaller than the first setting parameter, so as to adjust the opening of the electronic expansion valve 13 of the superheating indoor unit 17.
Wherein the first setting parameter is 1.
In step S330, if there is a portion of the overheated indoor units 17 having the target adjustment step number smaller than the first setting parameter, the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 having the target adjustment step number smaller than the first setting parameter is kept unchanged.
In this embodiment, if the target number of steps of the overheating indoor unit 17 is smaller than the first setting parameter, it is explained whether the target number of steps of the overheating indoor unit 17 is smaller, and whether the opening of the electronic expansion valve 13 of the overheating indoor unit 17 is adjusted has little influence on the overall system, or the opening of the electronic expansion valve 13 of the overheating indoor unit 17 may not be adjusted.
It should be noted that, in step S330, the condition that the target adjustment steps are greater than or equal to the first setting parameter exists in the plurality of overheated indoor units 17 with the superheat degree smaller than the first preset value, and if the target adjustment steps of all the overheated indoor units 17 are smaller than the first setting parameter, the method is performed according to step S340.
In step S340, if the target adjustment steps of all the overheated indoor units 17 with the superheat degree smaller than the first preset value are smaller than the first preset parameter, the opening of the corresponding electronic expansion valve 13 is reduced according to the superheat degree of the overheated indoor unit 17.
In this embodiment, if the target adjustment steps of all the overheated indoor units 17 with the degree of superheat being smaller than the first preset value are smaller than the first setting parameter, which means that the target adjustment steps of all the overheated indoor units 17 with the degree of superheat being smaller than the first preset value are smaller, it is necessary to further adjust the opening of each electronic expansion valve 13 according to the degree of superheat of each overheated indoor unit 17.
In step S350, the electronic expansion valve 13 of the overheat indoor unit 17 with the minimum overheat is controlled to reduce the corresponding initial adjustment step number.
In the present embodiment, if only one superheat indoor unit 17 having the smallest superheat degree exists among the plurality of superheat indoor units 17 having the superheat degree smaller than the first preset value and the target adjustment step number smaller than the first set parameter, it is explained that the refrigerant flow rate of the indoor unit 11 is excessive, and the opening degree of the electronic expansion valve 13 of the superheat indoor unit 17 is adjusted in accordance with the initial adjustment step number of the superheat indoor unit 17.
Referring to fig. 4, step S350 may include step S352 and step S354.
In step S352, if there are a plurality of overheated indoor units 17 with the degree of superheat being smaller than the first preset value and the degree of superheat being the smallest, the indoor environment temperature value of the corresponding overheated indoor unit 17 is obtained.
In the present embodiment, if there are a plurality of overheated indoor units 17 having a degree of superheat smaller than the first preset value and the degree of superheat is minimum, the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 having a degree of superheat smaller than the first preset value and the degree of superheat is adjusted according to the corresponding indoor environment temperature value.
In step S354, the overheated indoor unit 17 having the lowest environmental temperature value is controlled to first adjust the opening of the electronic expansion valve 13.
In the present embodiment, the initial adjustment step number is first installed in the overheat indoor unit 17 having the lowest control environment temperature value among the plurality of overheat indoor units 17 having the overheat degree smaller than the first preset value, and the overheat indoor unit 17 having the smallest overheat degree, to reduce the opening of the electronic expansion valve 13 of the overheat indoor unit 17.
If the ambient temperature value is the lowest, it means that the refrigerating load of the overheated indoor unit 17 is the smallest, and the refrigerant flow needs to be preferentially reduced, because the smaller refrigerant flow can meet the refrigerating requirement of the indoor unit 11, and the effect of reducing the opening of the expansion valve on the use comfort is smaller.
In step S360, the opening of the electronic expansion valve 13 of the superheating indoor unit 17 with other superheat degree smaller than the first preset value and the target adjustment step number smaller than the first set parameter is controlled to be unchanged.
In the present embodiment, when there are a plurality of overheated indoor units 17 having a degree of superheat smaller than the first preset value and having the smallest degree of superheat, only the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 having the smallest ambient temperature value is adjusted, and the electronic expansion valves 13 of the overheated indoor units 17 having the remaining plurality of degrees of superheat smaller than the first preset value and having the smallest degree of superheat are not adjusted.
In step S370, the electronic expansion valve 13 of the overheat indoor unit 17, which controls the overheat degree to be smaller than the first preset value and the target adjustment step number to be greater than or equal to the first setting parameter, decreases the target adjustment step number.
In this embodiment, if the superheat degree is smaller than the first preset value and the target adjustment step number is greater than or equal to the first set parameter, the electronic expansion valve 13 of the superheat indoor unit 17 is adjusted to be smaller according to the target adjustment step number.
It is easy to understand how the superheated indoor units 17 having the superheat degree smaller than the first preset value adjust the opening of the electronic expansion valve 13 in step S310 to step S370, and when the superheat degree is larger than the second preset value, the opening of the electronic expansion valve 13 of the superheated indoor units 17 is adjusted according to step S410 to step S470.
Referring to fig. 5, in step S410, it is determined whether the superheat degree is greater than a second preset value and whether the number of the superheat indoor units is greater than or equal to a set number.
In this embodiment, whether the superheat degree is greater than a second preset value is determined, and the second preset value is the same as the second preset value in the first embodiment, and whether the superheat degree is greater than the second preset value is determined, so that whether the refrigerant of the indoor unit 11 is insufficiently evaporated and liquid return occurs can be determined, which causes hidden danger to the operation of the compressor.
Step S420, if the superheat degree is greater than the second preset value, determining whether the target adjustment step number is smaller than the second setting parameter.
In this embodiment, if the superheat degree is greater than the second preset value, it is indicated that the superheat degree is too great, and the refrigerant in the indoor unit 11 indicates that the refrigerant flow is insufficient, and the refrigerating effect is poor, and if the superheat degree is greater than the second preset value, it is necessary to further determine whether the target adjustment parameter is smaller than the second preset parameter, so as to adjust the opening of the electronic expansion valve 13 of the superheating indoor unit 17.
In step S430, if the target adjustment step number is smaller than the second setting parameter, the opening of the electronic expansion valve 13 of the superheating indoor unit 17 with the target adjustment step number smaller than the second setting parameter is controlled to be unchanged.
In this embodiment, if the target number of steps of the overheating indoor unit 17 is smaller than the first setting parameter, it is explained whether the target number of steps of the overheating indoor unit 17 is smaller, and whether the opening of the electronic expansion valve 13 of the overheating indoor unit 17 is adjusted has little influence on the overall system, or the opening of the electronic expansion valve 13 of the overheating indoor unit 17 may not be adjusted.
It should be noted that, in step S430, the condition that the target adjustment steps are greater than or equal to the first setting parameter exists in the plurality of overheated indoor units 17 with the degree of superheat being less than the first preset value, and if the target adjustment steps of all the overheated indoor units 17 are less than the first setting parameter, the process is performed according to step S440.
In step S440, if the target adjustment steps of all the overheated indoor units 17 with the superheat degree greater than the second preset value are smaller than the second preset parameter, the opening of the corresponding electronic expansion valve 13 is adjusted according to the superheat degree of the overheated indoor unit 17.
In this embodiment, if the target adjustment steps of all the overheated indoor units 17 with the superheat degree greater than the second preset value are smaller than the first preset parameter, which means that the target adjustment steps of all the overheated indoor units 17 with the superheat degree smaller than the first preset value are smaller, it is necessary to further adjust the opening of each electronic expansion valve 13 according to the superheat degree of each overheated indoor unit 17.
In step S450, the electronic expansion valve 13 of the overheat indoor unit 17 with the largest overheat is controlled to increase the corresponding initial adjustment step number.
In the present embodiment, if only one superheat indoor unit 17 with the smallest superheat degree exists in the plurality of superheat indoor units 17 with the superheat degree smaller than the first preset value and the target adjustment step number smaller than the first set parameter, it is indicated that the refrigerant demand of the indoor unit 11 is large, and the opening degree of the electronic expansion valve 13 of the superheat indoor unit 17 is adjusted according to the initial adjustment step number of the superheat indoor unit 17.
Referring to fig. 6, step S350 may include step S352 and step S354.
In step S452, if there are a plurality of overheated indoor units 17 with the degree of superheat greater than the second preset value and the degree of superheat being the smallest, the indoor environment temperature value of the corresponding overheated indoor unit 17 is obtained.
In the present embodiment, if there are a plurality of overheated indoor units 17 having a degree of superheat smaller than the first preset value and the degree of superheat is minimum, the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 having a degree of superheat smaller than the first preset value and the degree of superheat is adjusted according to the corresponding indoor environment temperature value.
In step S454, the superheating indoor unit 17 with the highest ambient temperature value is controlled to first adjust the opening of the electronic expansion valve 13.
In the present embodiment, the initial adjustment step number is first installed in the overheat indoor unit 17 having the highest control environment temperature value among the plurality of overheat indoor units 17 having the overheat degree greater than the second preset value and the overheat degree being the largest, to increase the opening degree of the electronic expansion valve 13 of the overheat indoor unit 17.
The highest ambient temperature value indicates that the refrigerant demand of the overheated indoor unit 17 is large, and the refrigerant flow needs to be preferentially increased, because the large refrigerant flow can meet the refrigeration demand of the indoor unit 11, and the comfort of the user is improved.
In step S460, the opening of the electronic expansion valve 13 of the superheating indoor unit 17 with other superheating degrees greater than the second preset value and the target adjustment step number less than the second set parameter is controlled to be unchanged.
In the present embodiment, when there are a plurality of overheated indoor units 17 having a degree of superheat greater than the second preset value and the degree of superheat is the greatest, only the opening of the electronic expansion valve 13 of the overheated indoor unit 17 having the greatest environmental temperature value is adjusted, and the electronic expansion valves 13 of the overheated indoor units 17 having the remaining plurality of degrees of superheat greater than the second preset value and the degree of superheat is the greatest are not adjusted.
In step S470, the electronic expansion valve 13 of the superheating indoor unit 17, which controls the superheat degree to be greater than the second preset value and the target adjustment step number to be greater than or equal to the second set parameter, increases the target adjustment step number.
Referring to fig. 7, the embodiment of the present invention further provides an opening adjusting device 20 of an electronic expansion valve, which is applied to a multi-connected air conditioner 10, wherein the opening adjusting device 20 of the electronic expansion valve includes:
the first obtaining module 21 is configured to obtain the inlet pipe temperature value and the outlet pipe temperature value of the heat exchanger 12 of the indoor unit 11 under the condition of the cooling mode.
Step S11 and step S100 of the method for adjusting the opening degree of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the first obtaining module 21.
The first calculating module 22 is configured to calculate the superheat of the indoor unit 11 according to the inlet pipe temperature and the outlet pipe temperature.
Step S12 and step S200 of the method for adjusting the opening degree of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the first calculation module 22.
The judging module 23 is configured to judge whether the superheat degree is within a range of the first preset value and the second preset value.
The steps S13, S310, and S320 of the method for adjusting the opening of the electronic expansion valve 13 according to the embodiment of the present invention may be executed by the determination module 23.
The second calculation module 24 is configured to calculate an initial adjustment step number of the electronic expansion valve 13 of the superheat indoor unit 17 according to the superheat degree if the superheat degree is not within a range between the first preset value and the second preset value; the overheated indoor unit 17 is an indoor unit 11 whose degree of superheat is not within a range of the first preset value and the second preset value.
Step S14 of the opening adjustment method of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the second calculation module 24.
A second acquisition module 25 for acquiring the number of the overheated indoor units 17.
Step S15 of the opening adjustment method of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the second obtaining module 25.
The third calculation module 26 is configured to calculate a correction coefficient according to the number of the overheated indoor units 17.
Step S16 of the opening adjustment method of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the third calculation module 26.
A fourth calculation module 27 for calculating a target adjustment step number of the overheating indoor unit 17 according to the correction coefficient and the initial adjustment step number of the overheating indoor unit 17.
Step S17 of the opening degree adjustment method of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the fourth calculation module 27.
The control module 28 is configured to adjust the opening of the electronic expansion valve 13 of the superheating indoor unit 17 according to the target adjustment step number corresponding to the superheating indoor unit 17.
The steps S18, S310-S370, S410-S470 of the opening adjustment method of the electronic expansion valve 13 provided in the embodiment of the present invention may be executed by the second obtaining module 25.
In the embodiment of the invention, the controller can be an integrated circuit chip with signal processing capability. The controller may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a single-chip microcomputer, a micro-control unit (Microcontroller Unit, MCU), a complex programmable logic device (Complex Programmable Logic Device, CPLD), a Field-programmable gate array (Field-Programmable Gate Array, FPGA), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an embedded ARM, or other chips, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present invention.
In a possible embodiment, the multi-connected air conditioner 10 may further include a memory, where the program instructions are stored for being executed by the controller, for example, the opening adjusting device 20 of the electronic expansion valve provided in the embodiment of the present application includes at least one opening adjusting device that may be stored in the memory in a form of software or firmware. The Memory may be a stand-alone external Memory including, but not limited to, random access Memory (Random Access Memory, RAM), read Only Memory (ROM), programmable Read Only Memory (Programmable Read-Only Memory, PROM), erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM). The memory may also be provided integrally with the controller, e.g. the memory may be provided integrally with the controller in the same chip.
Although the present application is disclosed above, the present application is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the application, and the scope of the application should be assessed accordingly to that of the appended claims.

Claims (14)

1. The utility model provides an aperture adjusting method of electronic expansion valve, is applied to multi-connected air conditioner (10), multi-connected air conditioner (10) include off-premises station and a plurality of indoor set (11), a plurality of indoor set (11) are parallelly connected, indoor set (11) include heat exchanger (12) and electronic expansion valve (13), indoor set (11) are through electronic expansion valve (13) with off-premises station is connected, characterized in that, the aperture adjusting method of electronic expansion valve includes:
acquiring an inlet pipe temperature value and an outlet pipe temperature value of the heat exchanger (12) of the indoor unit (11) under the condition of a refrigerating mode;
calculating the superheat degree of the indoor unit (11) according to the inlet pipe temperature value and the outlet pipe temperature value;
judging whether the superheat degree is in a section of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value;
if the superheat degree is not in the interval of the first preset value and the second preset value, calculating the initial adjustment step number of the electronic expansion valve (13) of the superheat indoor unit (17) according to the superheat degree; wherein the overheat indoor unit (17) represents an indoor unit (11) in which the degree of overheat is not within the interval of the first preset value and the second preset value;
Acquiring the number of the overheating indoor units (17);
calculating a correction factor according to the number of the overheated indoor units (17);
calculating a target regulation step number of the overheating indoor machine (17) according to the correction coefficient and the initial regulation step number of the overheating indoor machine (17);
according to the target adjusting step number corresponding to the overheating indoor unit (17), the opening degree of an electronic expansion valve (13) of the overheating indoor unit (17) is adjusted;
the step of calculating a correction factor in accordance with the number of the overheated indoor units (17) includes:
n＝k0*N
wherein n is more than or equal to 1, N is the number of the overheating indoor units 17, k0 is a proportionality coefficient, and the value is generally 0-1 and is a correction coefficient;
the step of calculating the target adjustment step number of the overheating indoor machine (17) according to the correction coefficient and the initial adjustment step number of the overheating indoor machine (17) comprises the following steps:
S(j) 0 =S(j)/n
wherein S (j) is the initial adjustment step number, S (j) 0 The number of steps is adjusted for the target.
2. The method of adjusting an opening degree of an electronic expansion valve according to claim 1, wherein the step of determining whether the degree of superheat is within a range of a first preset value and a second preset value comprises:
judging whether the superheat degree is smaller than the first preset value or not;
Judging whether the number of the overheating indoor units (17) is larger than or equal to a set number;
if the degree of superheat is smaller than the first preset value and the number of the overheating indoor units (17) is greater than or equal to the set number, the step of adjusting the opening of the electronic expansion valve (13) of the overheating indoor unit (17) according to the target adjustment step number corresponding to the overheating indoor unit (17) includes:
judging whether the target regulation step number is smaller than a first set parameter or not; and if the target adjustment step number of the part of the overheating indoor units (17) is smaller than the first setting parameter, controlling the opening degree of the electronic expansion valve (13) of the overheating indoor units (17) with the target adjustment step number smaller than the first setting parameter to be unchanged.
3. The opening degree adjustment method of an electronic expansion valve according to claim 2, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:
and if the target adjustment step numbers of all the overheating indoor units (17) with the overheating degree smaller than the first preset value are smaller than the first set parameter, reducing the opening of the corresponding electronic expansion valve (13) according to the overheating degree of the overheating indoor units (17).
4. A method of adjusting an opening degree of an electronic expansion valve according to claim 3, wherein the step of adjusting the opening degree of the corresponding electronic expansion valve (13) in accordance with the degree of superheat of the superheating indoor unit (17) includes:
controlling the electronic expansion valve (13) of the overheat indoor unit (17) with the minimum overheat degree to reduce the corresponding initial adjustment step number;
and controlling the opening degree of an electronic expansion valve (13) of the overheat indoor unit (17) of which the superheat degree is smaller than the first preset value and the target adjustment step number is smaller than the first set parameter to be unchanged.
5. The opening degree adjustment method of an electronic expansion valve according to claim 4, wherein the step of controlling the electronic expansion valve (13) of the superheating indoor unit (17) with the smallest superheat degree to adjust the corresponding initial adjustment step number includes:
if a plurality of overheating indoor units (17) with the superheat degree smaller than the first preset value and the superheat degree minimum exist at the same time, acquiring the indoor environment temperature value of the corresponding overheating indoor unit (17);
and controlling the overheat indoor unit (17) with the lowest environment temperature value to firstly adjust the opening of the electronic expansion valve (13).
6. The opening degree adjustment method of an electronic expansion valve according to claim 2, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:
and controlling an electronic expansion valve (13) of the overheating indoor machine (17) with the superheat degree smaller than the first preset value and the target regulation step number larger than or equal to the first set parameter to regulate the target regulation step number.
7. The method of adjusting an opening degree of an electronic expansion valve according to claim 1, wherein the step of determining whether the degree of superheat is within a range of a first preset value and a second preset value comprises:
judging whether the superheat degree is larger than the second preset value or not;
judging whether the number of the overheating indoor units (17) is larger than or equal to a set number;
if the degree of superheat is greater than the second preset value and the number of the overheated indoor units (17) is greater than or equal to the set number, the step of adjusting the opening of the electronic expansion valve (13) of the overheated indoor unit (17) according to the target adjustment step number corresponding to the overheated indoor unit (17) includes:
Judging whether the target regulation step number is smaller than a second set parameter;
and if the target adjustment step number of part of the overheating indoor units (17) is smaller than the second setting parameter, controlling the opening degree of an electronic expansion valve (13) of the overheating indoor units (17) with the target adjustment step number smaller than the second setting parameter to be unchanged.
8. The opening degree adjustment method of an electronic expansion valve according to claim 7, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:
and if the target adjustment step numbers of all the overheating indoor units (17) with the overheating degree larger than the second preset value are smaller than the second set parameter, adjusting the opening of the corresponding electronic expansion valve (13) according to the overheating degree of the overheating indoor units (17).
9. The opening degree adjustment method of an electronic expansion valve according to claim 8, wherein the step of adjusting the opening degree of the corresponding electronic expansion valve (13) in accordance with the degree of superheat of the superheat indoor unit (17) includes:
Controlling the electronic expansion valve (13) of the overheat indoor unit (17) with the largest overheat degree to increase the corresponding initial adjustment step number;
and controlling the opening degree of an electronic expansion valve (13) of the overheat indoor unit (17) of which the superheat degree is larger than the second preset value and the target adjustment step number is smaller than the second set parameter to be unchanged.
10. The opening degree adjustment method of an electronic expansion valve according to claim 9, wherein the step of controlling the electronic expansion valve (13) of the superheat indoor unit (17) having the largest degree of superheat to adjust the corresponding initial adjustment step number includes:
if a plurality of overheating indoor units (17) with the superheat degree being larger than the second preset value and the superheat degree being minimum exist at the same time, acquiring the indoor environment temperature value of the corresponding overheating indoor unit (17);
and controlling the overheat indoor unit (17) with the highest ambient temperature value to firstly adjust the opening of the electronic expansion valve (13).
11. The opening degree adjustment method of an electronic expansion valve according to claim 10, characterized in that the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target adjustment step number corresponding to the superheating indoor unit (17) further includes:
And controlling an electronic expansion valve (13) of the overheating indoor machine (17) with the superheat degree being larger than the second preset value and the target adjustment step number being larger than or equal to the second set parameter to adjust the target adjustment step number.
12. The opening degree adjustment method of an electronic expansion valve according to claim 1, characterized in that the opening degree adjustment method of an electronic expansion valve includes:
if the superheat degree is smaller than the first preset value, controlling the opening degree of the corresponding electronic expansion valve (13) to be reduced;
if the superheat degree is larger than the second preset value, controlling the opening degree of the corresponding electronic expansion valve (13) to be increased;
and if the superheat degree is larger than or equal to a first preset value and smaller than or equal to a second preset value, controlling the opening degree of the corresponding electronic expansion valve (13) to be unchanged.
13. The utility model provides an aperture adjusting device of electronic expansion valve, is applied to multi-connected air conditioner (10), multi-connected air conditioner (10) include off-premises station and a plurality of indoor set (11), a plurality of indoor set (11) are parallelly connected, indoor set (11) include heat exchanger (12) and electronic expansion valve (13), indoor set (11) are through electronic expansion valve (13) with off-premises station is connected, characterized in that, aperture adjusting device (20) method of electronic expansion valve includes:
A first acquisition module (21) for acquiring an inlet pipe temperature value and an outlet pipe temperature value of the heat exchanger (12) of the indoor unit (11) under the condition of a refrigeration mode;
the first calculation module (22) is used for calculating the superheat degree of the indoor unit (11) according to the inlet pipe temperature and the outlet pipe temperature value;
the judging module (23) is used for judging whether the superheat degree is in a section of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value;
a second calculation module (24) configured to calculate, according to the degree of superheat, an initial number of steps of adjustment of the electronic expansion valve (13) of the superheat indoor unit (17) if the degree of superheat is not within a range of the first preset value and the second preset value; wherein the overheat indoor unit (17) represents an indoor unit (11) in which the degree of overheat is not within the interval of the first preset value and the second preset value;
a second acquisition module (25) for acquiring the number of overheated indoor units (17);
a third calculation module (26) for calculating a correction factor according to the number of the overheated indoor units (17);
a fourth calculation module (27) for calculating a target adjustment step number of the overheating indoor unit (17) according to the correction coefficient and the initial adjustment step number of the overheating indoor unit (17);
And the control module (28) is used for adjusting the opening of the electronic expansion valve (13) of the overheating indoor unit (17) according to the target adjustment step number corresponding to the overheating indoor unit (17).
14. A multi-connected air conditioner comprising a controller for executing computer instructions to implement the opening degree adjustment method of the electronic expansion valve according to any one of claims 1 to 12.
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