CN114688689A - 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
CN114688689A
CN114688689A CN202210343106.6A CN202210343106A CN114688689A CN 114688689 A CN114688689 A CN 114688689A CN 202210343106 A CN202210343106 A CN 202210343106A CN 114688689 A CN114688689 A CN 114688689A
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Prior art keywords
expansion valve
indoor unit
electronic expansion
preset value
overheated
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CN202210343106.6A
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CN114688689B (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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    • 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

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 within the interval of the first preset value and the second preset value, calculating the initial adjustment step number of an electronic expansion valve of the superheat indoor unit according to the superheat degree; acquiring the number of the overheated indoor units; calculating the target adjusting step number of the overheating indoor unit according to the correction coefficient and the initial adjusting step number of the overheating indoor unit; and adjusting the opening degree of an electronic expansion valve of the overheating indoor unit according to the target adjusting step number corresponding to the overheating indoor unit. The initial adjusting step number is corrected through the number of the overheated indoor units to obtain the target adjusting step number, so that the fluctuation of the temperature and the pressure of the whole multi-connected air conditioner system can be reduced, the stability of a compressor is kept, and the stability of the air outlet temperature of the indoor units is improved to improve the comfort of users.

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 has 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.
Usually, the adjustment cycles of the electronic expansion valves of the indoor units collocated with one outdoor unit are consistent, when the indoor units operate simultaneously, the electronic expansion valves of a plurality of indoor units may be adjusted synchronously and in the same direction, the electronic expansion valves of a plurality of indoor units increase or decrease the opening simultaneously, which may cause the fluctuation of parameters of the system, such as temperature, pressure, etc., especially when the number of indoor units is large, even cause the unstable operation of the compressor, the air outlet temperature of the indoor unit may fluctuate along with the fluctuation, and the comfort is poor.
Disclosure of Invention
The invention solves the problem of how to keep the compressor running stably and the outlet air temperature of the indoor unit kept at temperature, thereby improving the stability of the whole machine.
In order to solve the above problems, the present invention provides a method and an apparatus for adjusting an opening degree of an electronic expansion valve, and a multi-connected air conditioner.
In a first aspect, an embodiment of the present invention provides an opening adjusting method for 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, each indoor unit includes a heat exchanger and an electronic expansion valve, the indoor unit is connected to the outdoor unit through the electronic expansion valve, and the opening adjusting method for 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 pipe inlet temperature value and the pipe outlet temperature value;
judging whether the superheat degree is within an interval 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 within 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; the overheated indoor unit represents an indoor unit with the degree of superheat out of the interval between 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 a target adjusting step number of the overheated indoor unit according to the correction coefficient and the initial adjusting step number of the overheated indoor unit;
and adjusting the opening degree of an electronic expansion valve of the overheated indoor unit according to the target adjusting step number corresponding to the overheated indoor unit.
When the superheat degree is not within 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 to obtain the target adjusting step number, so that the fluctuation of the temperature and the pressure 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 degree of a user is improved.
In an optional embodiment of the present invention, the step of determining whether the superheat degree is within an interval between 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 overheated indoor units is greater than or equal to a set number;
if the superheat degree is smaller than the first preset value and the number of the overheated indoor units is larger than or equal to the set number, the step of adjusting the opening degree of an electronic expansion valve of the overheated indoor unit according to the target adjusting step number corresponding to the overheated indoor unit comprises the following steps:
judging whether the target adjusting step number is smaller than a first set parameter or not; and if the target adjusting step number of part of the overheated indoor units is smaller than the first set parameter, controlling the opening degree of an electronic expansion valve of the overheated indoor unit with the target adjusting step number smaller than the first set parameter to be kept unchanged.
In an optional embodiment of the present invention, the step of adjusting the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment step number corresponding to the overheated indoor unit further includes:
and if the target adjusting steps of all the overheating indoor units with the superheat degree smaller than the first preset value are smaller than the first set parameter, adjusting the corresponding opening degree of the electronic expansion valve according to the superheat degree of the overheating indoor unit.
In an alternative embodiment of the present invention, the step of adjusting the opening degree of the corresponding electronic expansion valve according to the superheat degree of the superheated indoor unit includes:
controlling the electronic expansion valve of the overheated indoor unit with the minimum superheat degree to reduce the corresponding initial adjustment step number;
and controlling the opening degree of the electronic expansion valve of the overheated indoor unit of which the superheat degree is less than the first preset value and the target adjusting step number is less than the first set parameter to be kept unchanged.
In an alternative embodiment of the present invention, the step of adjusting the corresponding initial adjustment step number by the electronic expansion valve of the overheated indoor unit that controls the least degree of superheat includes:
if a plurality of overheated indoor units with the overheating degrees smaller than the first preset value and the smallest overheating degree exist at the same time, acquiring the indoor environment temperature value of the corresponding overheated indoor unit;
and controlling the overheated indoor unit with the lowest environmental 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 degree of the electronic expansion valve of the overheated indoor unit according to the target adjusting step number corresponding to the overheated indoor unit further includes:
and controlling the electronic expansion valve of the overheated indoor unit with the superheat degree smaller than the first preset value and the target adjusting step number larger than or equal to the first set parameter to reduce the target adjusting step number.
In an optional embodiment of the present invention, the step of determining whether the superheat degree is within an interval between a first preset value and a second preset value includes:
judging whether the superheat degree is larger than a second preset value or not;
judging whether the number of the overheated indoor units is greater than or equal to a set number;
if the superheat degree is larger than the second preset value and the number of the overheated indoor units is larger than or equal to the set number, the step of adjusting the opening degree of an electronic expansion valve of the overheated indoor unit according to the target adjusting step number corresponding to the overheated indoor unit comprises the following steps:
judging whether the target adjusting step number is smaller than a second set parameter;
and if the target adjusting step number of part of the overheated indoor units is smaller than the second set parameter, controlling the opening degree of the electronic expansion valve of the overheated indoor unit with the target adjusting step number smaller than the second set parameter to be kept unchanged.
In an optional embodiment of the present invention, the step of adjusting the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment step number corresponding to the overheated indoor unit further includes:
and if the target adjusting steps of all the overheating indoor units with the superheat degree larger than the second preset value are smaller than the second set parameter, adjusting the corresponding opening degree of the electronic expansion valve according to the superheat degree of the overheating indoor unit.
In an alternative embodiment of the present invention, the step of adjusting the opening degree of the corresponding electronic expansion valve according to the superheat degree of the superheated indoor unit includes:
controlling the electronic expansion valve of the overheated indoor unit with the largest degree of superheat to increase the corresponding initial adjustment step number;
and controlling the opening degree of the electronic expansion valve of the overheated indoor unit of which the superheat degree is greater than the second preset value and the target adjusting step number is less than the second set parameter to be kept unchanged.
In an optional embodiment of the present invention, the step of controlling the electronic expansion valve of the overheated indoor unit with the largest degree of superheat to adjust the corresponding initial adjustment step number comprises:
if a plurality of overheated indoor units with the superheat degrees larger than the second preset value and the minimum superheat degrees exist at the same time, acquiring the indoor environment temperature value of the corresponding overheated indoor unit;
and controlling the overheated indoor unit with the highest ambient temperature value to firstly adjust the opening degree of the electronic expansion valve.
In an optional embodiment of the present invention, the step of adjusting the opening degree of the electronic expansion valve of the overheated indoor unit according to the target adjustment step number corresponding to the overheated indoor unit further includes:
and controlling the electronic expansion valve of the overheated indoor unit with the superheat degree larger than the second preset value and the target adjusting step number larger than or equal to the second set parameter to adjust the target adjusting step number.
In an optional 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 increase;
and if the superheat degree is greater than or equal to a first preset value and less than or equal to a second preset value, controlling the opening degree of the corresponding electronic expansion valve to be kept unchanged.
In a second aspect, an embodiment of the present invention provides an opening adjusting device for 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, each indoor unit includes a heat exchanger and an electronic expansion valve, the indoor unit is connected to the outdoor unit through the electronic expansion valve, and the opening adjusting device for 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;
the judging module is used for judging whether the superheat degree is within an interval 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 overheated indoor unit according to the superheat degree if the superheat degree is not within the interval of the first preset value and the second preset value; the overheated indoor unit represents an indoor unit with the degree of superheat out of the interval between 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;
the fourth calculation module is used for calculating the target adjusting step number of the overheated indoor unit according to the correction coefficient and the initial adjusting step number of the overheated indoor unit;
and the control module is used for adjusting the opening of an electronic expansion valve of the overheated indoor unit according to the target adjusting step number corresponding to the overheated 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 degree 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 illustrating sub-steps of step S350 of a method for adjusting an opening degree of an electronic expansion valve according to a second embodiment of the present invention.
Fig. 5 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. 6 is a flowchart of the substep of step S450 of the method for adjusting the opening degree of an electronic expansion valve according to the second embodiment of the present invention.
Fig. 7 is a block diagram of an opening degree adjusting device of an electronic expansion valve according to an embodiment of the present invention.
Description of reference numerals:
10-multi-connected air conditioners; 11-indoor unit; 12-a heat exchanger; 13-an electronic expansion valve; 14-inlet tube temperature sensor; 15-an outlet tube temperature sensor; 16-ambient temperature sensor; 17-superheating indoor unit; 20-an opening degree adjusting device of the electronic expansion valve; 21-a first obtaining module; 22-a first calculation module; 23-a 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 to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
First embodiment
Referring to fig. 1, the present embodiment provides an opening degree adjusting method for an electronic expansion valve 13, the opening degree adjusting method for an electronic expansion valve 13 provided in the present embodiment is mainly applied to a multi-connected air conditioner 10, and the opening degree adjusting method for an electronic expansion valve 13 provided in the present embodiment can reduce temperature and pressure fluctuations of the whole multi-connected air conditioner 10 system, maintain stability of a compressor, and improve stability of an air outlet temperature of an indoor unit 11, so as to improve comfort of a user.
The multi-connected air conditioner 10 includes an outdoor unit and a plurality of indoor units 11, the indoor units 11 are connected in parallel, each indoor unit 11 includes a heat exchanger 12 and an electronic expansion valve 13, and the indoor unit 11 is connected to 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, wherein 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 pipeline of the refrigerant and used for detecting an inlet pipe temperature value. The outlet pipe temperature sensor 15 is arranged on the refrigerant outflow pipeline and used for detecting an outlet pipe temperature value. The ambient temperature sensor 16 is used to detect an ambient temperature value. And the controller executes the opening degree adjusting method of the electronic expansion valve 13 after receiving the pipe inlet temperature value, the pipe outlet temperature value and the environment temperature value.
Referring to fig. 2, the specific flow of the method for adjusting the opening degree of the electronic expansion valve 13 provided in this embodiment is as follows:
step S11, 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 the cooling mode.
The method for adjusting the opening degree of the electronic expansion valve 13 provided in this embodiment is mainly applied to the cooling mode, and obtains the temperature value of the inlet pipe and the temperature value of the outlet pipe of the heat exchanger 12 of each indoor unit 11 when the multi-split air conditioner 10 operates in the cooling mode.
In step S12, the superheat degree of the indoor unit 11 is calculated based on 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 inlet pipe temperature value is subtracted from the outlet pipe temperature value to obtain the superheat degree.
It is easy to understand that, in the same situation for each indoor unit 11, the superheat degree is obtained by subtracting the inlet pipe temperature value from the outlet pipe temperature value.
Step S13, judging whether the superheat degree is within the interval of a first preset value and a second preset value; wherein the first preset value is smaller than the second preset value.
In the embodiment, the interval formed by the first preset value and the second preset value is an interval in which the multi-split air conditioner 10 can stably operate, and if the superheat degree is smaller than the first preset value, it indicates that the superheat degree is too small, and the liquid return is easily caused when the refrigerant of the indoor unit 11 is insufficiently evaporated, thereby causing a 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 not good, so that it is necessary to determine whether the superheat degree is within an interval from the first preset value to the second preset value, so as to determine whether the multi-split air conditioner 10 is operating normally.
Wherein the first preset value is-1 ℃ to 1 ℃. The second preset value is 2-5 ℃.
In step S14, if the superheat degree is not within the interval between the first preset value and the second preset value, the initial adjustment step number of the electronic expansion valve 13 of the superheated indoor unit 17 is calculated according to the superheat degree. The superheat indoor unit 17 indicates an indoor unit 11 having a superheat degree that is not within the interval between the first preset value and the second preset value.
In this embodiment, after the superheat degree is not within the interval between 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-split air conditioner 10.
For convenience of description, the indoor unit 11 having the superheat degree within the interval between 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, calculating the initial adjustment step number of the electronic expansion valve 13 of the superheat indoor unit 17, specifically as follows:
Figure BDA0003575395170000081
wherein S (j) is the opening degree of the electronic expansion valve 13 of the jth indoor unit 11, St-1(j) Opening degree of the electronic expansion valve 13 for the previous regulation period, if the current regulation period is the first regulation period St-1(j) The value of (a) is the initial opening degree S0 (preferably 100-300 pls), and the value of S0 can be specifically determined according to the characteristics of the electronic expansion valve 13 and the maximum allowable opening degree; a1 and a2 are calculation coefficients (for example, 5-20), and can be different values, which are determined by experimental effects; t0 is a preset target superheat degree (preferably 0-5 ℃), and TA is less than or equal to T0 is less than or equal to TB.
In step S15, the number of superheat indoor units 17 is acquired.
In the present embodiment, the superheat degrees of the indoor units 11 are calculated one by one in the manner of steps S11 to S14, and the number of indoor units 11, i.e., the superheat indoor units 17, whose superheat degrees are not within the interval of the first preset value and the second preset value are counted.
In step S16, a correction factor is calculated based on the number of overheated indoor units 17.
In this embodiment, the number of the overheated indoor units 17 is different, the adjustment modes of the electronic expansion valves 13 are different, if the number of the overheated indoor units 17 is larger, and generally, the number of the overheated indoor units 17 exceeds 2, that is, it is considered that the number of the overheated indoor units 17 is larger, the simultaneous adjustment of the electronic expansion valves 13 of a plurality of overheated indoor units 17 may cause flow fluctuation of the whole machine, which may cause compressor frequency fluctuation, a correction coefficient is calculated according to the number of the overheated indoor units 17, and the initial adjustment step number is corrected according to the correction coefficient, which may ensure the stability of the whole machine movement.
The correction coefficient is calculated according to the following formula:
n is k 0N and N is equal to or greater than 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 value ranges of k0 are different under the two conditions that the superheat degree is less than the first preset value and the superheat degree is greater than the second preset value.
In step S17, the target adjustment step number of the superheat indoor unit 17 is calculated based on the correction coefficient and the initial adjustment step number of the superheat indoor unit 17.
In the present embodiment, the target adjustment step number of the superheat indoor unit 17 can be calculated according to the correction factor and the initial adjustment step number of the superheat indoor unit, so as to adjust the opening degree of the electronic expansion valve 13 of the superheat indoor unit 17.
Calculating the target adjustment step number according to the following formula:
S(j)0(j) where s (j) is the initial adjustment step number, s (j)0The number of steps is adjusted for the target.
In step S18, the opening degree of the electronic expansion valve 13 of the superheating indoor unit 17 is adjusted 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 superheating indoor unit 17 is adjusted according to the target adjustment step number corresponding to the superheating indoor unit 17.
It is easy to understand that if the degree of superheat is less than the first preset value, the opening degree of the corresponding electronic expansion valve 13 is controlled to decrease; if the superheat degree is larger than a second preset value, controlling the opening degree of the corresponding electronic expansion valve 13 to increase; and if the superheat degree is greater than or equal to the first preset value and less than or equal to the second preset value, controlling the opening degree of the corresponding electronic expansion valve 13 to be kept unchanged.
If the superheat degree is smaller than the first preset value, it indicates that the current refrigerant is insufficiently evaporated, and the refrigerant flow is large, and the opening degree 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 small and the refrigerant is small, 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 within the interval of the first preset value and the second preset value, the initial adjusting step number is corrected through the number of the superheat 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 maintained, and the stability of the air outlet temperature of the indoor unit 11 is improved, so that the comfort degree of a user is improved.
Second embodiment
The present embodiment provides a method for adjusting an opening degree of an electronic expansion valve 13, and the method for adjusting an opening degree of an electronic expansion valve 13 provided in this embodiment can reduce fluctuations in temperature and pressure of the whole multi-connected air conditioner 10 system, maintain stability of a compressor, and improve stability of an outlet air temperature of an indoor unit 11, so as to improve comfort of a user.
Referring to fig. 3, in step S100, an inlet pipe temperature value and an outlet pipe temperature value of the heat exchanger 12 of the indoor unit 11 are obtained under the condition of the cooling mode.
In this embodiment, the working process and working principle of step S100 are the same as those of step S11 in the first embodiment, and refer to step S11, which is not described herein again.
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 operation process and operation principle of step S200 are the same as those of step S12 in the first embodiment, and refer to step S12, which is not described herein again.
Step S310, judging whether the superheat degree is smaller than a first preset value or not and judging whether the number of the overheated indoor units is larger than or equal to a set number or not.
In this embodiment, it is determined whether the degree of superheat is less than a first preset value, where the first preset value is the same as the first preset value in the first embodiment, and whether the degree of superheat is less than the first preset value, it may be determined whether the refrigerant in the indoor unit 11 is insufficiently evaporated and returns to the liquid, which may cause a hidden danger to the operation of the compressor.
The number is set to 2, and generally, the number of the overheating indoor units 17 exceeds 2, that is, the number of the overheating indoor units 17 is considered to be large, and the simultaneous adjustment of the electronic expansion valves 13 of a plurality of overheating indoor units 17 may cause flow fluctuation of the whole unit, resulting in compressor frequency fluctuation.
In step S320, if the superheat degree is less than the first preset value and the number of the superheat indoor units 17 is determined to be greater than or equal to the set number, it is determined whether the target adjustment step number is less than the first set parameter.
In this embodiment, if the superheat degree is less than the first preset value, it indicates that the superheat degree is too small, the refrigerant of the indoor unit 11 is not sufficiently evaporated, and liquid return is likely to occur, which may cause a hidden trouble to the operation of the compressor. Under the condition that the superheat degree is smaller than the first preset value, whether the target adjusting parameter is smaller than the first set parameter needs to be further judged, so that the opening degree of the electronic expansion valve 13 of the superheat indoor unit 17 is adjusted.
Wherein the first setting parameter is 1.
In step S330, if there is a portion of the overheated indoor unit 17 with 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 with the target adjustment step number smaller than the first setting parameter is controlled to be kept unchanged.
In this embodiment, if the target number of steps of a part of the overheated indoor units 17 is smaller than the first setting parameter, it is described that the target number of adjustment steps of the overheated indoor units 17 is smaller, and whether to adjust the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 has little influence on the overall system, the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 may not be adjusted.
It should be noted that the step S330 is applied to the condition that the target adjustment step number is greater than or equal to the first setting parameter in the plurality of superheat indoor units 17 with the superheat degrees smaller than the first preset value, and if the target adjustment step numbers of all superheat indoor units 17 are smaller than the first setting parameter, the step S330 is performed.
In step S340, if the target adjustment steps of all the superheating indoor units 17 with the superheating degrees smaller than the first preset value are smaller than the first set parameter, the corresponding opening degree of the electronic expansion valve 13 is decreased according to the superheating degrees of the superheating indoor units 17.
In this embodiment, if the target adjustment steps of all the superheat indoor units 17 with the superheat degrees smaller than the first preset value are smaller than the first set parameter, which indicates that the target adjustment steps of all the superheat indoor units 17 with the superheat degrees smaller than the first preset value are smaller, the opening degree of each electronic expansion valve 13 needs to be further adjusted according to the superheat degrees of each superheat indoor unit 17.
In step S350, the electronic expansion valve 13 of the overheated indoor unit 17 with the minimum degree of superheat is controlled to decrease the corresponding initial adjustment step number.
In the present embodiment, if only one overheated indoor unit 17 having the smallest degree of superheat is present among the plurality of overheated indoor units 17 having a degree of superheat smaller than the first preset value and a target number of adjustment steps smaller than the first set parameter, which indicates that the refrigerant flow rate of the indoor unit 11 is excessive, the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 is adjusted in accordance with the initial number of adjustment steps of the overheated indoor unit 17.
Referring to fig. 4, step S350 may include step S352 and step S354.
In step S352, if a plurality of overheated indoor units 17 with the lowest degree of superheat smaller than the first preset value exist at the same time, the indoor environment temperature value of the corresponding overheated indoor unit 17 is obtained.
In this embodiment, if a plurality of overheated indoor units 17 with the smallest degree of superheat smaller than the first preset value coexist, the opening degrees of the electronic expansion valves 13 of the overheated indoor units 17 with the smallest degree of superheat smaller than the first preset value are adjusted according to the corresponding indoor environment temperature value.
In step S354, the overheated indoor unit 17 with the lowest ambient temperature value is controlled to first adjust the opening degree of the electronic expansion valve 13.
In the present embodiment, the overheating indoor unit 17 that controls the lowest ambient temperature value among the plurality of overheating indoor units 17 having the lowest superheat degree and the lowest superheat degree smaller than the first preset value is first installed with an initial adjustment step number that reduces the opening degree of the electronic expansion valve 13 of the overheating indoor unit 17.
When the ambient temperature value is the lowest, it means that the refrigeration load of the superheating indoor unit 17 is the lowest, and the refrigerant flow needs to be preferentially reduced, because a small refrigerant flow can meet the refrigeration requirement of the indoor unit 11, and the influence of reducing the expansion valve opening degree on the use comfort is small.
And step S360, controlling the opening degree of the electronic expansion valve 13 of the overheating indoor unit 17 with the other overheating degree smaller than the first preset value and the target adjusting step number smaller than the first set parameter to be kept unchanged.
In the present embodiment, when there are a plurality of overheated indoor units 17 having a minimum degree of superheat that is less than the first preset value, only the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 having the minimum ambient temperature value is adjusted, and the electronic expansion valves 13 of the remaining plurality of overheated indoor units 17 having a minimum degree of superheat that is less than the first preset value are not adjusted.
In step S370, the electronic expansion valve 13 of the superheat indoor unit 17, in which the superheat degree is less than the first preset value and the target adjustment step number is greater than or equal to the first set parameter, is controlled to decrease the target adjustment step number.
In the present embodiment, if the superheat degree is less 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 easily understood that, in the steps S310 to S370, how the opening degree of the electronic expansion valve 13 is adjusted for the superheat indoor unit 17 with the superheat degree smaller than the first preset value, and when the superheat degree is larger than the second preset value, the opening degrees of the electronic expansion valves 13 of the superheat indoor units 17 are adjusted according to the steps S410 to 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 overheated indoor units is greater than or equal to a set number.
In this embodiment, it is determined whether the superheat degree is greater than a second preset value, where the second preset value is the same as the second preset value in the first embodiment, and it is determined whether the superheat degree is greater than the second preset value, so as to determine whether the refrigerant in the indoor unit 11 is insufficiently evaporated and returns liquid, which may cause a hidden danger to the operation of the compressor.
In step S420, if the degree of superheat is greater than the second preset value, it is determined whether the target adjustment step number is less than the second set parameter.
In this embodiment, if the degree of superheat is greater than the second preset value, it indicates that the degree of superheat is too large, the refrigerant in the indoor unit 11 indicates that the refrigerant flow is insufficient, and the refrigeration effect is not good, and under the condition that the degree of superheat is greater than the second preset value, it needs to be further determined whether the target adjustment parameter is smaller than the second set parameter, so as to adjust the opening degree of the electronic expansion valve 13 of the superheat indoor unit 17.
In step S430, if the target adjustment step number is smaller than the second setting parameter, the opening degree of the electronic expansion valve 13 of the superheating indoor unit 17, of which the target adjustment step number is smaller than the second setting parameter, is controlled to be kept unchanged.
In this embodiment, if the target number of steps of a part of the superheating indoor unit 17 is smaller than the first setting parameter, it is indicated that the target adjustment number of steps of the superheating indoor unit 17 is smaller, and if the influence of adjusting the opening degree of the electronic expansion valve 13 of the superheating indoor unit 17 on the overall system is not large, the opening degree of the electronic expansion valve 13 of the superheating indoor unit 17 may not be adjusted.
It should be noted that the step S430 is applied to the condition that the target adjustment step number is greater than or equal to the first setting parameter in the plurality of superheat indoor units 17 with the superheat degrees smaller than the first preset value, and if the target adjustment step numbers of all superheat indoor units 17 are smaller than the first setting parameter, the step S430 is performed.
In step S440, if the target adjustment steps of all the superheat indoor units 17 with the superheat degrees larger than the second preset value are smaller than the second set parameter, the opening degree of the corresponding electronic expansion valve 13 is adjusted according to the superheat degrees of the superheat indoor units 17.
In this embodiment, if the target adjustment steps of all the superheat indoor units 17 with the superheat degrees larger than the second preset value are smaller than the first set parameter, which indicates that the target adjustment steps of all the superheat indoor units 17 with the superheat degrees smaller than the first preset value are smaller, the opening degree of each electronic expansion valve 13 needs to be further adjusted according to the superheat degrees of each superheat indoor unit 17.
In step S450, the electronic expansion valve 13 of the overheated indoor unit 17 with the largest degree of superheat is controlled to increase the corresponding initial adjustment step number.
In this embodiment, if only one overheated indoor unit 17 with the smallest degree of superheat is present in the plurality of overheated indoor units 17 with degrees of superheat smaller than the first preset value and the target number of adjustment steps smaller than the first set parameter, which indicates that the refrigerant demand of the indoor unit 11 is large, the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 is adjusted according to the initial number of adjustment steps of the overheated indoor unit 17.
Referring to fig. 6, step S350 may include step S352 and step S354.
In step S452, if a plurality of overheated indoor units 17 with the smallest degree of superheat larger than the second preset value exist at the same time, the indoor environment temperature value of the corresponding overheated indoor unit 17 is obtained.
In this embodiment, if a plurality of overheated indoor units 17 with the smallest degree of superheat smaller than the first preset value coexist, the opening degrees of the electronic expansion valves 13 of the overheated indoor units 17 with the smallest degree of superheat smaller than the first preset value are adjusted according to the corresponding indoor environment temperature value.
In step S454, the overheated indoor unit 17 with the highest ambient temperature value is controlled to adjust the opening degree of the electronic expansion valve 13 first.
In the present embodiment, the overheating indoor unit 17 controlling the highest ambient temperature value among the overheating indoor units 17 having the highest superheat degree and the highest superheat degree larger than the second preset value is first installed with an initial adjustment step number to increase the opening degree of the electronic expansion valve 13 of the overheating indoor unit 17.
If the ambient temperature value is the highest, it indicates that the refrigerant demand of the superheat 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, the comfort of the user is improved.
And step S460, controlling the opening degree of the electronic expansion valve 13 of the overheating indoor unit 17 with the superheat degree larger than the second preset value and the target adjusting step number smaller than the second set parameter to be kept 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 having the greatest degree of superheat, only the opening degree of the electronic expansion valve 13 of the overheated indoor unit 17 having the greatest ambient temperature value is adjusted, and the electronic expansion valves 13 of the remaining plurality of overheated indoor units 17 having a degree of superheat greater than the second preset value and having the greatest degree of superheat are not adjusted.
In step S470, the electronic expansion valve 13 of the superheat indoor unit 17, in which the superheat degree is greater than the second preset value and the target adjustment step number is greater than or equal to the second set parameter, is controlled to increase the target adjustment step number.
Referring to fig. 7, an embodiment of the present invention further provides an opening adjusting device 20 for an electronic expansion valve, which is applied to a multi-connected air conditioner 10, and the opening adjusting device 20 for an electronic expansion valve includes:
the first obtaining module 21 is configured to obtain a pipe inlet temperature value and a pipe outlet 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 according to the embodiment of the present invention may be executed by the first obtaining module 21.
The first calculating module 22 is configured to calculate a superheat degree of the indoor unit 11 according to the inlet pipe temperature and the outlet pipe temperature.
Steps S12 and S200 of the method for adjusting the opening degree of the electronic expansion valve 13 according to 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 an interval between a first preset value and a second preset value.
Step S13, step S310, and step S320 of the method for adjusting the opening degree of the electronic expansion valve 13 according to the embodiment of the present invention may be executed by the determining module 23.
The second calculation module 24 is configured to calculate an initial adjustment step number of the electronic expansion valve 13 of the overheated indoor unit 17 according to the superheat degree if the superheat degree is not within an interval between the first preset value and the second preset value; the superheat indoor unit 17 indicates an indoor unit 11 having a superheat degree that is not within the interval between the first preset value and the second preset value.
Step S14 of the method for adjusting the opening degree of the electronic expansion valve 13 according to the embodiment of the present invention may be executed by the second calculation module 24.
A second obtaining module 25 for obtaining the number of superheating indoor units 17.
Step S15 of the method for adjusting the opening degree of the electronic expansion valve 13 according to the embodiment of the present invention may be executed by the second obtaining module 25.
A third calculation module 26 for calculating a correction factor depending on the number of overheated indoor units 17.
Step S16 of the method for adjusting the opening degree of the electronic expansion valve 13 according to the embodiment of the present invention may be executed by the third computing module 26.
And a fourth calculating module 27, configured to calculate a target adjustment step number of the superheat indoor unit 17 according to the correction coefficient and the initial adjustment step number of the superheat indoor unit 17.
Step S17 of the method for adjusting the opening degree of the electronic expansion valve 13 according to the embodiment of the present invention may be executed by the fourth calculating module 27.
And the control module 28 is used for adjusting the opening degree of the electronic expansion valve 13 of the overheating indoor unit 17 according to the target adjusting step number corresponding to the overheating indoor unit 17.
Step S18, step S310 to step S370, and step S410 to step S470 of the method for adjusting the opening degree of the electronic expansion valve 13 according to the embodiment of the present invention may be executed by the second obtaining module 25.
In an embodiment of the present invention, the controller may be an integrated circuit chip having signal processing capability. The controller may be a general-purpose processor, and may include a Central Processing Unit (CPU), a single chip Microcomputer (MCU), a Micro Controller Unit (MCU), a Complex Programmable Logic Device (CPLD), a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an embedded ARM, and other chips, where the controller may implement or execute the methods, steps, and Logic blocks disclosed in the embodiments of the present invention.
In a possible embodiment, the multi-type air conditioner 10 may further include a memory for storing program instructions executable by the controller, for example, the opening degree adjusting device 20 of the electronic expansion valve provided in the embodiment of the present application includes at least one of software and firmware stored in the memory. The Memory may be a stand-alone external Memory including, but not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Read-Only Memory (EPROM), electrically Erasable Read-Only Memory (EEPROM). The memory may also be integrated with the controller, for example, the memory may be integrated with the controller on the same chip.
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 (14)

1. The opening degree adjusting method of the electronic expansion valve is applied to a multi-connected air conditioner (10), the multi-connected air conditioner (10) comprises an outdoor unit and a plurality of indoor units (11), the indoor units (11) are connected in parallel, each indoor unit (11) comprises a heat exchanger (12) and an electronic expansion valve (13), and each indoor unit (11) is connected with the outdoor unit through the electronic expansion valve (13), and the opening degree adjusting method of the electronic expansion valve comprises the following steps:
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;
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 within an interval 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 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; wherein the overheated indoor unit (17) represents an indoor unit (11) having an overheated degree not within the interval of the first preset value and the second preset value;
acquiring the number of the overheated indoor units (17);
calculating a correction factor according to the number of the overheated indoor units (17);
calculating a target adjusting step number of the overheated indoor unit (17) according to the correction coefficient and the initial adjusting step number of the overheated indoor unit (17);
and adjusting the opening degree of an electronic expansion valve (13) of the overheated indoor unit (17) according to the target adjusting step number corresponding to the overheated indoor unit (17).
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 an interval 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 overheated indoor units (17) is greater than or equal to a set number;
if the superheat degree is less than the first 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 degree of an electronic expansion valve (13) of the overheated indoor unit (17) according to the target adjusting step number corresponding to the overheated indoor unit (17) comprises the following steps:
judging whether the target adjusting step number is smaller than a first set parameter or not; and if the target adjusting step number of part of the overheated indoor units (17) is smaller than the first set parameter, controlling the opening degree of an electronic expansion valve (13) of the overheated indoor unit (17) with the target adjusting step number smaller than the first set parameter to be kept unchanged.
3. The method for adjusting the opening degree of an electronic expansion valve according to claim 2, wherein the step of adjusting the opening degree of the electronic expansion valve (13) of the overheated indoor unit (17) according to the target number of adjustment steps corresponding to the overheated indoor unit (17) further comprises:
and if the target adjusting steps of all the overheating indoor units (17) with the overheating degrees smaller than the first preset value are smaller than the first set parameter, adjusting the corresponding opening degree of the electronic expansion valve (13) to be smaller according to the overheating degrees 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 corresponding opening degree of the electronic expansion valve (13) in accordance with the degree of superheat of the superheat indoor unit (17) comprises:
controlling the electronic expansion valve (13) of the overheated indoor unit (17) with the minimum superheat degree to reduce the corresponding initial adjustment step number;
and controlling the opening degree of the electronic expansion valve (13) of the overheated indoor unit (17) with the superheat degree smaller than the first preset value and the target adjusting step number smaller than the first set parameter to be kept unchanged.
5. An opening degree adjustment method of an electronic expansion valve according to claim 4, characterized in that the step of adjusting the electronic expansion valve (13) of the superheating indoor unit (17) controlling the degree of superheat to be minimal comprises the step of:
if a plurality of overheated indoor units (17) with the overheating degrees smaller than the first preset value and the smallest overheating degree exist at the same time, acquiring the indoor environment temperature value of the corresponding overheated indoor unit (17);
and controlling the overheated indoor unit (17) with the lowest environmental temperature value to firstly adjust the opening degree of the electronic expansion valve (13).
6. The method for adjusting the opening degree of an electronic expansion valve according to claim 2, wherein the step of adjusting the opening degree of the electronic expansion valve (13) of the overheated indoor unit (17) according to the target number of adjustment steps corresponding to the overheated indoor unit (17) further comprises:
and controlling the electronic expansion valve (13) of the overheated indoor unit (17) of which the superheat degree is less than the first preset value and the target adjusting step number is greater than or equal to the first set parameter to reduce the target adjusting 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 an interval of a first preset value and a second preset value comprises:
judging whether the superheat degree is larger than a second preset value or not;
judging whether the number of the overheated indoor units (17) is greater than or equal to a set number;
if the superheat degree is larger than the second preset value and the number of the superheat indoor units (17) is larger than or equal to the set number, the step of adjusting the opening degree of an electronic expansion valve (13) of the superheat indoor unit (17) according to the target adjusting step number corresponding to the superheat indoor unit (17) comprises the following steps:
judging whether the target adjusting step number is smaller than a second set parameter;
and if the target adjusting step number of part of the overheated indoor units (17) is smaller than the second set parameter, controlling the opening degree of an electronic expansion valve (13) of the overheated indoor unit (17) with the target adjusting step number smaller than the second set parameter to be kept unchanged.
8. The method for adjusting the opening degree of an electronic expansion valve according to claim 7, wherein the step of adjusting the opening degree of the electronic expansion valve (13) of the superheating indoor unit (17) according to the target number of adjustment steps corresponding to the superheating indoor unit (17) further comprises:
and if the target adjusting steps of all the overheating indoor units (17) with the overheating degrees larger than the second preset value are smaller than the second set parameter, adjusting the corresponding opening degree of the electronic expansion valve (13) according to the overheating degrees of the overheating indoor units (17).
9. A method of adjusting an opening degree of an electronic expansion valve according to claim 8, wherein the step of adjusting the corresponding opening degree of the electronic expansion valve (13) in accordance with the degree of superheat of the superheat indoor unit (17) comprises:
controlling the electronic expansion valve (13) of the overheated indoor unit (17) with the largest superheat degree to increase the corresponding initial adjustment step number;
and controlling the opening degree of the electronic expansion valve (13) of the overheated indoor unit (17) with the superheat degree larger than the second preset value and the target adjusting step number smaller than the second set parameter to be kept unchanged.
10. A method of adjusting an opening degree of an electronic expansion valve according to claim 9, wherein the step of adjusting the electronic expansion valve (13) of the superheating indoor unit (17) having the highest degree of superheat comprises the steps of:
if a plurality of overheated indoor units (17) with the overheating degrees larger than the second preset value and the smallest overheating degree exist at the same time, acquiring the indoor environment temperature value of the corresponding overheated indoor unit (17);
and controlling the overheated indoor unit (17) with the highest ambient temperature value to firstly adjust the opening degree of the electronic expansion valve (13).
11. The method for adjusting the opening degree of an electronic expansion valve according to claim 10, wherein the step of adjusting the opening degree of the electronic expansion valve (13) of the overheated indoor unit (17) according to the target number of adjustment steps corresponding to the overheated indoor unit (17) further comprises:
and controlling the electronic expansion valve (13) of the overheated indoor unit (17) with the superheat degree larger than the second preset value and the target adjusting step number larger than or equal to the second set parameter to increase the target adjusting step number.
12. The method of adjusting an opening degree of an electronic expansion valve according to claim 1, comprising:
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 increase;
and if the superheat degree is greater than or equal to a first preset value and less than or equal to a second preset value, controlling the opening degree of the corresponding electronic expansion valve (13) to be kept unchanged.
13. An opening degree adjusting device of an electronic expansion valve is applied to a multi-connected air conditioner (10), the multi-connected air conditioner (10) comprises an outdoor unit and a plurality of indoor units (11), the indoor units (11) are connected in parallel, each indoor unit (11) comprises a heat exchanger (12) and an electronic expansion valve (13), and each indoor unit (11) is connected with the outdoor unit through the electronic expansion valve (13), and the opening degree adjusting device (20) of the electronic expansion valve comprises:
the first acquisition module (21) is used 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;
the judging module (23) is used for judging whether the superheat degree is within an interval 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) for calculating the initial adjustment step number of the electronic expansion valve (13) of the overheated indoor unit (17) according to the superheat degree if the superheat degree is not within the interval of the first preset value and the second preset value; wherein the overheated indoor unit (17) represents an indoor unit (11) with an overheating degree 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 depending on the number of overheated indoor units (17);
a fourth calculation module (27) for calculating a target adjustment step number of the overheated indoor unit (17) according to the correction coefficient and the initial adjustment step number of the overheated indoor unit (17);
and the control module (28) is used for adjusting the opening degree of an electronic expansion valve (13) of the overheated indoor unit (17) according to the target adjusting step number corresponding to the overheated indoor unit (17).
14. A multi-connected air conditioner comprising a controller for executing computer instructions to implement the method for adjusting the opening degree of an electronic expansion valve according to any one of claims 1 to 12.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115523591A (en) * 2022-08-17 2022-12-27 宁波奥克斯电气股份有限公司 Control method and device for electronic expansion valve of indoor unit and central air conditioner

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0221165A (en) * 1988-07-11 1990-01-24 Daikin Ind Ltd Operation controller for air conditioner
JP2005016782A (en) * 2003-06-24 2005-01-20 Matsushita Electric Ind Co Ltd Method for controlling expansion valve for multi-room type air conditioner
KR20060063001A (en) * 2004-12-06 2006-06-12 삼성전자주식회사 A multi air conditioner system and electronic expansion valve opening degree control method of the multi air conditioner system
EP2535669A2 (en) * 2011-06-17 2012-12-19 Mitsubishi Heavy Industries, Ltd. Multi-split type air conditioning system
KR20120139539A (en) * 2011-06-17 2012-12-27 가부시키가이샤 사기노미야세이사쿠쇼 Controller for electronic expansion valve
CN103982987A (en) * 2014-05-07 2014-08-13 广东美的暖通设备有限公司 Method and system for preventing bias flowing of refrigerant in multi-split air conditioner and multi-split air conditioner
WO2015006952A1 (en) * 2013-07-18 2015-01-22 杭州三花研究院有限公司 Method for controlling degree of superheat of vehicle air-conditioning system, and vehicle air-conditioning system
CN105864984A (en) * 2016-04-27 2016-08-17 广东美的暖通设备有限公司 Adjusting method and device for indoor unit electronic expansion valve
CN107664368A (en) * 2017-09-27 2018-02-06 合肥美的暖通设备有限公司 The control method and device of air-conditioning system and its electric expansion valve
WO2019052035A1 (en) * 2017-09-18 2019-03-21 广东美的暖通设备有限公司 Method for controlling multi-split air conditioner, multi-split air conditioner system, and computer-readable storage medium
KR20190059582A (en) * 2017-11-23 2019-05-31 엘지전자 주식회사 Air-conditioning system and controlling method thereof
CN110094858A (en) * 2019-04-11 2019-08-06 海信（山东）空调有限公司 Control method, device, computer product and the air-conditioning of air conditioner electronic expansion valve
CN110579046A (en) * 2019-09-27 2019-12-17 海信（山东）空调有限公司 Control method and device for electronic expansion valve in multi-split refrigeration operation
CN110595004A (en) * 2019-09-29 2019-12-20 宁波奥克斯电气股份有限公司 Air conditioner noise reduction control method and system and air conditioner
CN110671781A (en) * 2019-10-24 2020-01-10 宁波奥克斯电气股份有限公司 Multi-split refrigerant regulation control method and device, storage medium and air conditioner
CN111964233A (en) * 2020-08-28 2020-11-20 珠海拓芯科技有限公司 Opening degree control method and device and air conditioner
CN113551379A (en) * 2020-04-26 2021-10-26 青岛海尔空调电子有限公司 Expansion valve opening degree control method for air conditioning system

Patent Citations (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0221165A (en) * 1988-07-11 1990-01-24 Daikin Ind Ltd Operation controller for air conditioner
JP2005016782A (en) * 2003-06-24 2005-01-20 Matsushita Electric Ind Co Ltd Method for controlling expansion valve for multi-room type air conditioner
KR20060063001A (en) * 2004-12-06 2006-06-12 삼성전자주식회사 A multi air conditioner system and electronic expansion valve opening degree control method of the multi air conditioner system
EP2535669A2 (en) * 2011-06-17 2012-12-19 Mitsubishi Heavy Industries, Ltd. Multi-split type air conditioning system
KR20120139539A (en) * 2011-06-17 2012-12-27 가부시키가이샤 사기노미야세이사쿠쇼 Controller for electronic expansion valve
WO2015006952A1 (en) * 2013-07-18 2015-01-22 杭州三花研究院有限公司 Method for controlling degree of superheat of vehicle air-conditioning system, and vehicle air-conditioning system
CN103982987A (en) * 2014-05-07 2014-08-13 广东美的暖通设备有限公司 Method and system for preventing bias flowing of refrigerant in multi-split air conditioner and multi-split air conditioner
CN105864984A (en) * 2016-04-27 2016-08-17 广东美的暖通设备有限公司 Adjusting method and device for indoor unit electronic expansion valve
WO2019052035A1 (en) * 2017-09-18 2019-03-21 广东美的暖通设备有限公司 Method for controlling multi-split air conditioner, multi-split air conditioner system, and computer-readable storage medium
CN107664368A (en) * 2017-09-27 2018-02-06 合肥美的暖通设备有限公司 The control method and device of air-conditioning system and its electric expansion valve
KR20190059582A (en) * 2017-11-23 2019-05-31 엘지전자 주식회사 Air-conditioning system and controlling method thereof
CN110094858A (en) * 2019-04-11 2019-08-06 海信（山东）空调有限公司 Control method, device, computer product and the air-conditioning of air conditioner electronic expansion valve
CN110579046A (en) * 2019-09-27 2019-12-17 海信（山东）空调有限公司 Control method and device for electronic expansion valve in multi-split refrigeration operation
CN110595004A (en) * 2019-09-29 2019-12-20 宁波奥克斯电气股份有限公司 Air conditioner noise reduction control method and system and air conditioner
CN110671781A (en) * 2019-10-24 2020-01-10 宁波奥克斯电气股份有限公司 Multi-split refrigerant regulation control method and device, storage medium and air conditioner
CN113551379A (en) * 2020-04-26 2021-10-26 青岛海尔空调电子有限公司 Expansion valve opening degree control method for air conditioning system
WO2021218272A1 (en) * 2020-04-26 2021-11-04 青岛海尔空调电子有限公司 Method for controlling opening degree of expansion valve of air conditioning system
CN111964233A (en) * 2020-08-28 2020-11-20 珠海拓芯科技有限公司 Opening degree control method and device and air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115523591A (en) * 2022-08-17 2022-12-27 宁波奥克斯电气股份有限公司 Control method and device for electronic expansion valve of indoor unit and central air conditioner

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