CN105864981A - Adjusting method and system for multi-split air conditioner - Google Patents
Adjusting method and system for multi-split air conditioner Download PDFInfo
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- CN105864981A CN105864981A CN201610265703.6A CN201610265703A CN105864981A CN 105864981 A CN105864981 A CN 105864981A CN 201610265703 A CN201610265703 A CN 201610265703A CN 105864981 A CN105864981 A CN 105864981A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 239000007788 liquid Substances 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 abstract description 8
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000001704 evaporation Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 8
- 230000004044 response Effects 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000005494 condensation Effects 0.000 description 5
- 238000009833 condensation Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F24F11/70—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
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F24F11/70—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the invention provides an adjusting method and system for a multi-split air conditioner. The method includes the steps that the temperature value set by a user and the air inlet temperature value of an indoor unit are obtained; first control information is generated according to the relation between the temperature value set by the user and the air inlet temperature value; and the opening degree of a first electronic expansion valve of the indoor unit is adjusted according to the first control information. By means of the adjusting method and system for the multi-split air conditioner, the indoor unit of the multi-split air conditioner can be flexibly regulated according to the change of the indoor temperature, the change range of the indoor temperature is narrowed, the comfort level is improved, and the control stability and reliability of a multi-split air conditioner system are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner adjusting method and system.
Background
The multi-split air conditioner is an air conditioning system formed by matching one air conditioner outdoor unit with two or more air conditioner indoor units. The air conditioner has the advantages of low operation cost, wide range of refrigerating and heating temperature, high design freedom degree, convenience and attractiveness in installation (only one outdoor unit is used), and the like.
In the existing multi-split air conditioner, the opening degree of the electronic expansion valve cannot be adjusted by the indoor unit in the refrigeration mode according to the indoor temperature, and the indoor temperature capacity output adjustment (namely, 0% output or 100% output) can be realized only by opening or closing the electronic expansion valve, so that the temperature change range in a room is large, the outlet air temperature is suddenly cool and suddenly hot, and the comfort is poor. And because a plurality of indoor units share one outdoor unit, when a plurality of indoor units run simultaneously, the flow of the outdoor unit is simultaneously distributed to each indoor unit, therefore, when the indoor units are continuously closed or opened to run, the flow of the outdoor unit can affect other running indoor units, and the stability and the reliability of the whole multi-split system are not facilitated.
Disclosure of Invention
The embodiment of the invention provides a multi-split air conditioner adjusting method and system, which are used for solving the problems of large indoor temperature change range, poor comfort, and low system control stability and reliability caused by the fact that an indoor unit cannot be flexibly adjusted according to indoor temperature in the existing multi-split air conditioner system.
A first aspect of an embodiment of the present invention provides a method for adjusting multiple online units, where the method includes:
acquiring a temperature value set by a user and an inlet air temperature value of an indoor unit;
generating first control information according to the magnitude relation between the temperature value set by the user and the inlet air temperature value;
and adjusting the opening degree of a first electronic expansion valve of the indoor unit according to the first control information.
A second aspect of an embodiment of the present invention provides a multi-split system, including an indoor unit and an outdoor unit, where the indoor unit includes:
the first acquisition module is used for acquiring a temperature value set by a user and an inlet air temperature value of the indoor unit;
the first generation module is used for generating first control information according to the size relationship between the temperature value set by the user and the inlet air temperature value;
and the first execution module is used for adjusting the opening degree of a first electronic expansion valve of the indoor unit according to the first control information.
According to the embodiment of the invention, control information is generated according to the size relationship between the temperature value set by a user and the inlet air temperature value; and the opening of the electronic expansion valve of the indoor unit is adjusted according to the generated control information, so that the opening of the electronic expansion valve of the multi-split indoor unit can be finely adjusted according to the indoor temperature, the change range of the indoor temperature is narrowed, the comfort level is improved, and the control stability and reliability of the multi-split system are enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart illustrating a method for adjusting multiple online units according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating a method for adjusting multiple online units according to a second embodiment of the present invention;
fig. 3 is a schematic flowchart of a method for adjusting multiple online units according to a third embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for adjusting a multi-split air conditioner according to a fourth embodiment of the present invention;
fig. 5 is a schematic flowchart of a method for adjusting multiple online units according to a fifth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a multi-split system according to a sixth embodiment of the present invention;
fig. 7 is a schematic structural diagram of a multi-split system according to a seventh embodiment of the present invention;
fig. 8 is a schematic structural diagram of a multi-split system according to an eighth embodiment of the present invention;
fig. 9 is a schematic structural diagram of a multi-split system according to a ninth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a multi-split system according to a tenth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover non-exclusive inclusions, e.g., a process or an apparatus that comprises a list of steps is not necessarily limited to those structures or steps expressly listed but may include other steps or structures not expressly listed or inherent to such process or apparatus.
The technical scheme of the invention is described as follows by combining the specific embodiment from the viewpoint of refrigeration control of the multi-split indoor unit:
fig. 1 is a schematic flow chart of a method for adjusting multiple on-line units according to an embodiment of the present invention, where the method may be implemented by a multiple on-line system. As shown in fig. 1, the method provided by this embodiment includes the following steps:
and S101, acquiring a temperature value set by a user and an inlet air temperature value of the indoor unit.
In this embodiment, the inlet air temperature value of the indoor unit can be obtained by detecting an inlet air temperature sensor arranged in the indoor unit, or can be replaced by a temperature measured by a temperature sensor provided in the line controller or a temperature measured by a temperature sensor provided in the remote controller. It is preferred. The inlet air temperature value of the indoor unit in the implementation is obtained by detecting an inlet air temperature sensor arranged in the indoor unit.
The temperature value set by the user is an indoor temperature value set by the user through a human-computer interaction interface on a remote controller or an indoor unit.
Furthermore, considering that the adjustment of the indoor unit requires a certain response time and execution time, an adjustment period (i.e., a first period) can be set for the adjustment of the indoor unit according to the response time and execution time of the indoor unit, and according to the adjustment period, a temperature value set by a user and an inlet air temperature value of the indoor unit are periodically obtained, and the periodic adjustment of the indoor unit is completed according to the temperature value set by the user and the inlet air temperature value. The adjusting period can be specifically set according to specific needs, and the value of the adjusting period is generally greater than or equal to the sum of the response time and the execution time of the indoor unit adjustment. Specifically, in this embodiment, the value range of the adjustment period is preferably set to 30s to 180s, that is, the value of the adjustment period may be any value within this time range.
The value range of the adjusting period is set to be 30-180 s, so that the response time and the execution time of the indoor unit adjustment can be ensured, and the problems that the comfort is influenced due to the large indoor temperature change range caused by the overlong adjusting period can be solved.
Step S102, generating first control information according to the size relation between the temperature value set by the user and the inlet air temperature value.
Specifically, after a temperature value set by a user and an inlet air temperature value of the indoor unit are obtained, the temperature value set by the user is compared with the inlet air temperature value of the indoor unit, if the temperature value set by the user is greater than the inlet air temperature value, control information for expanding the electronic expansion valve of the indoor unit is generated by a multi-split system (hereinafter referred to as a system for short), if the temperature value set by the user is less than the inlet air temperature value, control information for reducing the electronic expansion valve of the indoor unit is generated by the system, and if the temperature value set by the user is equal to the inlet air temperature value, control information for maintaining the current opening degree of. In this embodiment, it is preferable that the opening degree adjustment range of the indoor unit electronic expansion valve is set to 50pls to 480 pls.
Further, in order to realize accurate control of the electronic expansion valve of the indoor unit, the control information generated by the system for controlling the electronic expansion valve of the indoor unit should include information on the number of steps used for controlling the opening of the electronic expansion valve, for example, when the temperature value set by the user is greater than the intake air temperature value, the control information generated by the system should include information on the number of steps used for increasing the opening of the electronic expansion valve, and when the temperature value set by the user is less than the intake air temperature value, the control information generated by the system should include information on the number of steps used for decreasing the opening of the electronic expansion valve.
Still further, in the prior art, there are various methods for obtaining the step number information, and in this embodiment, it is preferable to calculate and obtain the step number information by combining fuzzy control and PID control, and a specific calculation method thereof is similar to that in the prior art and is not described herein again.
And step S103, adjusting the opening of a first electronic expansion valve of the indoor unit according to the first control information.
Specifically, for example, when the temperature value set by the user is greater than the intake air temperature value, after the first control information is generated, the opening degree of the electronic expansion valve of the indoor unit is increased according to the step number information included in the control information and used for increasing the opening degree of the electronic expansion valve of the indoor unit, so that the purpose of individually regulating and controlling the electronic expansion valve of the indoor unit according to the indoor temperature is achieved. When the temperature value set by the user is less than or equal to the intake air temperature value, the execution mode of the step is similar to the execution mode, and is not described herein again.
In the embodiment, the control information is generated according to the magnitude relation between the temperature value set by the user and the inlet air temperature value; and the opening of the electronic expansion valve of the indoor unit is adjusted according to the generated control information, so that the opening of the electronic expansion valve of the multi-split indoor unit can be finely adjusted according to the indoor temperature, the variation range of the indoor temperature is narrowed, the comfort level is improved, and the control stability and reliability of the multi-split system are enhanced.
Fig. 2 is a flowchart illustrating a method for adjusting multiple online units according to a second embodiment of the present invention. As shown in fig. 2, the method provided by this embodiment further includes, on the basis of the embodiment shown in fig. 1, the following steps:
and step S11, obtaining a liquid pipe temperature value and an air pipe temperature value of the indoor unit.
In this embodiment, the liquid pipe temperature value of the indoor unit may be preferably obtained by detecting a liquid pipe temperature sensor disposed in the indoor unit, and the air pipe temperature value of the indoor unit may be preferably obtained by detecting an air pipe temperature sensor disposed in the indoor unit.
Step S12, calculating to obtain the heat exchanger superheat degree of the indoor unit according to the liquid pipe temperature value and the air pipe temperature value, and determining the executable operation of the first electronic expansion valve according to the heat exchanger superheat degree, or,
and determining the operation which can be executed by the first electronic expansion valve according to the air pipe temperature value.
Specifically, in this embodiment, the method for determining the operation that can be performed by the first electronic expansion valve according to the superheat degree of the heat exchanger may include at least one of the following manners:
in a first mode
After the liquid pipe temperature value and the gas pipe temperature value of the indoor unit are obtained, preferably, the difference operation can be carried out on the gas pipe temperature value and the liquid pipe temperature value to obtain the superheat degree of a heat exchanger of the indoor unit, after the superheat degree of the heat exchanger is obtained, the calculated superheat degree of the heat exchanger is compared with a preset first threshold value, and if the superheat degree of the heat exchanger is smaller than or equal to the first threshold value, it is determined that the executable operation of an electronic expansion valve of the indoor unit can only be valve closing operation. The first threshold may be specifically set according to specific needs, and in general, the value of the first threshold may be set to any value within a range of-5 ℃ to 0 ℃.
Mode two
After the superheat degree of the heat exchanger is obtained through calculation, the superheat degree of the heat exchanger can be compared with a preset second threshold value, and if the superheat degree of the heat exchanger is larger than or equal to the second threshold value, it is determined that the operation which can be executed by the first electronic expansion valve can only be valve opening operation. The second threshold, similar to the first threshold, may also be specifically set according to specific needs, and in general, the value of the second threshold may be set to any value within a range of 10 ℃ to 20 ℃.
Further, in the embodiment, the method for determining the operation executable by the electronic expansion valve of the indoor unit according to the air pipe temperature value may preferably perform a difference operation on the intake air temperature value of the indoor unit and a preset third threshold value, compare the operation result with the air pipe temperature value of the indoor unit, and determine that the operation executable by the electronic expansion valve of the indoor unit can only be a valve opening operation if the operation result is less than or equal to the air pipe temperature value of the indoor unit. The value of the third threshold may be specifically set according to specific needs, and in general, the value of the third threshold may be set to any value within a range of 2 ℃ to 10 ℃.
In the embodiment, the superheat degree/air pipe temperature value of the heat exchanger of the indoor unit is compared with the preset threshold value, and the operation executable by the electronic expansion valve of the current indoor unit is determined according to the comparison result, so that the indoor unit can be prevented from being damaged due to improper operation of the electronic expansion valve.
Fig. 3 is a flowchart illustrating a method for adjusting multiple online units according to a third embodiment of the present invention. As shown in fig. 3, the method provided by this embodiment further includes, on the basis of the embodiment shown in fig. 2, the following steps:
step S21, acquiring the current opening degree of the first electronic expansion valve;
in this embodiment, the opening degree of the electronic expansion valve can be obtained through a memory function of the system CPU, for example, when the electronic expansion valve of the indoor unit is adjusted, the CPU can automatically record the adjusted opening degree value of the electronic expansion valve, or can obtain the adjusted opening degree value of the electronic expansion valve according to the current opening degree of the electronic expansion valve and the information of the current step number of the adjusted electronic expansion valve.
And step S22, determining the operation which can be executed by the first electronic expansion valve according to the opening degree.
Specifically, after the current opening degree of the electronic expansion valve of the indoor unit is obtained, the current opening degree of the electronic expansion valve may be compared with a preset fourth threshold, and if the opening degree of the electronic expansion valve is less than or equal to the fourth threshold, it may be determined that the operation that the electronic expansion valve of the indoor unit can perform is only a valve opening operation. The value of the fourth threshold may be specifically set according to specific needs, and in general, the value of the fourth threshold may be determined according to a critical closing point of the electronic expansion valve. For example, the closing critical value of the electronic expansion valve in the indoor unit is 50pls, the value of the fourth threshold value may be set to any value greater than or equal to 50 pls.
In the embodiment, the current opening degree of the electronic expansion valve of the indoor unit is compared with the preset threshold value, and the operation executable by the current electronic expansion valve of the indoor unit is determined according to the comparison result, so that adverse effects on the control stability and reliability of the system due to the mistaken closing of the electronic expansion valve can be avoided. .
Fig. 4 is a flowchart illustrating a method for adjusting multiple online units according to a fourth embodiment of the present invention. As shown in fig. 4, the method provided by this embodiment further includes, on the basis of the embodiment shown in fig. 1, the following steps:
step S201, acquiring the current exhaust superheat degree and the target exhaust superheat degree of the outdoor unit.
Specifically, in this embodiment, the current discharge superheat degree of the outdoor unit is preferably obtained by performing a difference operation on the discharge temperature of the compressor in the outdoor unit and the condensation temperature, wherein the discharge temperature of the outdoor unit is preferably detected by a discharge temperature sensor disposed in the outdoor unit, and the condensation temperature is preferably obtained by converting a measurement value of a high pressure sensor in the outdoor unit, and the conversion method is similar to that in the prior art and is not described herein again.
Further, in the present embodiment, the target discharge superheat degree of the outdoor unit is preferably obtained by referring to a target discharge superheat table based on the condensing temperature, the evaporating temperature, and the rotation speed of the compressor in the outdoor unit. The rotation speed is preferably detected by a rotation speed sensor provided in the outdoor unit. The evaporating temperature is preferably obtained by converting the measured value of the low pressure sensor in the outdoor unit, and the converting method is similar to the method in the prior art and will not be described herein.
Considering that the adjustment of the outdoor unit requires a certain response time and execution time, an adjustment period (i.e., a preset second period) may be set for the adjustment of the outdoor unit according to the response time and execution time of the outdoor unit, and the discharge superheat degree and the target discharge superheat degree of the outdoor unit are periodically obtained according to the adjustment period, and the periodic adjustment of the outdoor unit is completed according to the discharge superheat degree and the target discharge superheat degree. The adjustment period can be specifically set according to specific needs, and in general, the value of the adjustment period should be greater than or equal to the sum of the response time and the execution time of the outdoor unit adjustment. Specifically, in this embodiment, the value range of the adjustment period is preferably set to 10s to 90s, that is, the value of the adjustment period may be any value within this range.
The value range of the outdoor unit adjusting period is set to be 10-90 s, so that the response time and the execution time of the outdoor unit adjusting can be ensured, and the problems of uncoordinated matching between the outdoor unit and the indoor unit, large temperature change range and poor comfort caused by overlong adjusting period can be solved.
And S202, generating second control information according to the magnitude relation between the current exhaust superheat degree and the target exhaust superheat degree.
Specifically, after the current exhaust superheat degree and the target exhaust superheat degree of the outdoor unit are obtained, the current actual exhaust superheat degree and the target exhaust superheat degree of the outdoor unit are compared, if the current actual exhaust superheat degree is larger than the target exhaust superheat degree, the system generates control information for expanding the electronic expansion valve of the outdoor unit, if the current actual exhaust superheat degree of the outdoor unit is smaller than the target exhaust superheat degree, the system generates control information for reducing the electronic expansion valve of the outdoor unit, and if the current actual exhaust superheat degree of the outdoor unit is equal to the target exhaust superheat degree, the system generates control information for maintaining the current opening degree of the electronic expansion valve of the outdoor unit.
Further, in order to achieve accurate control of the electronic expansion valve of the outdoor unit, the control information generated by the system for controlling the electronic expansion valve of the outdoor unit should include information on the number of steps used to control the opening of the electronic expansion valve, for example, when the current actual discharge superheat of the outdoor unit is greater than the target discharge superheat, the control information generated by the system should include information on the number of steps used to increase the opening of the electronic expansion valve, and when the current actual discharge superheat of the outdoor unit is less than the target discharge superheat, the control information generated by the system should include information on the number of steps used to decrease the opening of the electronic expansion valve.
Still further, in the prior art, there are various methods for acquiring the step number information, and in this embodiment, it is preferable to calculate and acquire the step number information by combining fuzzy control and PID control. The specific calculation method is similar to that in the prior art, and is not described herein again.
And step S203, adjusting the opening degree of a second electronic expansion valve of the outdoor unit according to the second control information.
This step is similar to the execution manner of step S103 in the embodiment shown in fig. 1 and is not described here again.
Further, in this embodiment, before step S201, an initialization step for an electronic expansion valve of the outdoor unit may be further included.
Specifically, when initializing the outdoor unit electronic expansion valve, first, the states of the components in the outdoor unit are detected (for example, whether the components are in a normal operating state or not). Meanwhile, in this embodiment, it is also necessary to determine whether the outdoor unit includes the subcooler from the prestored/written component information of the outdoor unit, and if so, initialize the opening degree of the outdoor unit electronic expansion valve to (e + f) pls and configure the opening degree range of the outdoor unit electronic expansion valve to (e + f) pls to 480 pls. If not, the opening degree of the outdoor electronic expansion valve is initialized to (e-f) pls, and the opening degree range of the outdoor electronic expansion valve is configured to be (e-f) pls to 480 pls. Wherein e is determined according to the critical closing point of the electronic expansion valve of the outdoor unit, f is determined according to the deviation value of the critical opening point, and the value of e is larger than the value of f.
According to the embodiment, the independent regulation and control of the outdoor unit in the multi-split air conditioner are realized by judging the size relationship between the current exhaust superheat degree and the target exhaust superheat degree of the outdoor unit, the possibility is provided for the independent regulation and control of the indoor unit of the multi-split air conditioner, the system can realize the purposes of reducing the indoor temperature change range, improving the comfort degree and enhancing the control stability and reliability of the multi-split air conditioner system through the independent regulation and control of the indoor unit.
Fig. 5 is a flowchart illustrating a method for adjusting multiple online units according to a fifth embodiment of the present invention. As shown in fig. 5, the method provided by this embodiment further includes, on the basis of the embodiment shown in fig. 4, the following steps:
and step S31, acquiring the suction temperature and the evaporation temperature of the compressor in the outdoor unit, and determining the suction superheat degree of the outdoor unit according to the suction temperature and the evaporation temperature.
In this embodiment, the suction temperature of the compressor in the outdoor unit is preferably detected by a suction temperature sensor provided in the outdoor unit.
The evaporating temperature can be obtained by converting the measured value of the low-pressure sensor in the outdoor unit, and the converting method is similar to the method in the prior art and is not described in detail herein.
In this embodiment, after obtaining the suction temperature and the evaporation temperature of the compressor in the outdoor unit, it is preferable that the suction superheat degree of the outdoor unit be obtained by performing a difference operation on the suction temperature and the evaporation temperature.
And step S32, comparing the suction superheat degree with a preset fifth threshold value, and if the suction superheat degree is greater than or equal to the fifth threshold value, forcibly opening the second electronic expansion valve.
Specifically, in this embodiment, the value of the fifth threshold may be specifically set according to specific needs, and in general, the value of the fifth threshold may be any value within a range of 15 ℃ to 40 ℃.
In this embodiment, on the basis of the embodiment shown in fig. 4, the suction superheat of the outdoor unit is compared with a preset threshold value to determine whether the electronic expansion valve (i.e., the second electronic expansion valve) of the outdoor unit needs to be forcibly opened, so that the purpose of automatically opening the electronic expansion valve of the outdoor unit according to the value of the suction superheat can be achieved.
Fig. 6 is a schematic structural diagram of a multi-split system according to a sixth embodiment of the present invention, and as shown in fig. 6, the multi-split system according to the present embodiment includes an indoor unit and an outdoor unit, where the indoor unit includes the following modules:
the first acquisition module 010 is used for acquiring a temperature value set by a user and an inlet air temperature value of the indoor unit;
the first generation module 020 is used for generating first control information according to the size relationship between the temperature value set by the user and the inlet air temperature value;
and the first execution module 030 is configured to adjust an opening degree of a first electronic expansion valve of the indoor unit according to the first control information.
The first generating module 020 is specifically configured to:
if the temperature value set by the user is greater than the wind temperature value, generating the first control information for expanding the opening;
if the temperature value set by the user is smaller than the temperature value of the wind, generating the first control information for reducing the opening;
and if the temperature value set by the user is equal to the wind temperature value, generating the first control information for maintaining the opening degree.
The first control information includes step number information for controlling the opening degree of the first electronic expansion valve.
The first obtaining module 010 is specifically configured to:
and acquiring the temperature value set by the user and the inlet air temperature value according to a preset first period.
Further, the first generating module 020 comprises;
and the first calculation submodule 021 is used for calculating and obtaining the step number information according to fuzzy control and PID control.
The multi-split system provided in this embodiment can be used to execute the method shown in fig. 1, and the execution manner and the beneficial effects thereof are similar to those of the embodiment shown in fig. 1, and are not described again here.
Fig. 7 is a schematic structural view of a multi-split system according to a seventh embodiment of the present invention, and as shown in fig. 7, based on the embodiment shown in fig. 6, the multi-split system provided in this embodiment further includes:
the second obtaining module 040 is used for obtaining a liquid pipe temperature value and an air pipe temperature value of the indoor unit;
the first determining module 050 is used for calculating and obtaining the superheat degree of a heat exchanger of the indoor unit according to the liquid pipe temperature value and the air pipe temperature value, and determining the executable operation of the first electronic expansion valve according to the superheat degree of the heat exchanger, or,
and determining the operation which can be executed by the first electronic expansion valve according to the air pipe temperature value.
Wherein the first determining module 050 comprises:
the first determining sub-module 051 is used for comparing the superheat degree of the heat exchanger with a preset first threshold value, and if the superheat degree of the heat exchanger is larger than or equal to the first threshold value, determining that the executable operation of the first electronic expansion valve is valve opening operation; or,
and comparing the superheat degree of the heat exchanger with a preset second threshold value, and if the superheat degree of the heat exchanger is less than or equal to the second threshold value, determining that the operation executable by the first electronic expansion valve is a valve closing operation.
The second determining submodule 052 is used for calculating a difference value between the inlet air temperature value and a preset third threshold value and comparing the difference value with the air pipe temperature value;
and if the difference value is less than or equal to the air pipe temperature value, determining that the operation which can be executed by the first electronic expansion valve is a valve opening operation.
The multi-split system provided by this embodiment can be used in the method shown in fig. 2, and the execution manner and the beneficial effects thereof are similar to those of the embodiment shown in fig. 2, and are not described again here.
Fig. 8 is a schematic structural view of a multi-split system according to an eighth embodiment of the present invention, and as shown in fig. 8, based on the embodiment shown in fig. 7, the indoor unit of the multi-split system according to the present embodiment further includes:
a third obtaining module 060 configured to obtain a current opening degree of the first electronic expansion valve;
a second determining module 070, configured to determine, according to the opening degree, an operation that the first electronic expansion valve can perform.
The second determining module 070 is specifically configured to:
and comparing the opening degree with a preset fourth threshold value, and if the opening degree is smaller than or equal to the fourth threshold value, determining that the operation which can be executed by the first electronic expansion valve is a valve opening operation.
The multi-split system provided by this embodiment can be used to execute the method shown in fig. 3, and the execution manner and the beneficial effects thereof are similar to those of the embodiment shown in fig. 3, and are not described again here.
Fig. 9 is a schematic structural diagram of a multi-split system according to a ninth embodiment of the present invention, and as shown in fig. 9, in the multi-split system according to the embodiment shown in fig. 8, an outdoor unit of the system includes:
a fourth obtaining module 080, configured to obtain a current exhaust superheat degree and a target exhaust superheat degree of the outdoor unit;
a second generating module 090, configured to generate second control information according to a magnitude relationship between the current exhaust superheat degree and the target exhaust superheat degree;
and a second executing module 100, configured to adjust an opening degree of a second electronic expansion valve of the outdoor unit according to the second control information.
An initialization module 101, configured to initialize the second electronic expansion valve.
The fourth obtaining module 080 is specifically configured to:
detecting and acquiring the exhaust temperature, the condensation temperature, the evaporation temperature and the rotating speed of a compressor in the outdoor unit;
calculating to obtain the exhaust superheat degree according to the exhaust temperature and the condensation temperature;
and inquiring a target exhaust superheat table according to the condensation temperature, the evaporation temperature and the rotating speed to obtain the target exhaust superheat.
The second generating module 090 is specifically configured to:
if the current exhaust superheat degree is larger than the target exhaust superheat degree, generating second control information for expanding the opening degree;
if the current exhaust superheat degree is less than the target exhaust superheat degree, generating second control information for reducing the opening degree;
and if the current exhaust superheat degree is equal to the target exhaust superheat degree, generating the second control information for maintaining the opening degree.
The second control information includes step number information for controlling the opening degree of the second electronic expansion valve.
The second generation module 090, comprising:
and the second calculation submodule 091 is used for calculating and obtaining the step number information according to the fuzzy control and the PID control.
The fourth obtaining module 080 is specifically configured to:
and acquiring the current exhaust superheat degree and the target exhaust superheat degree of the outdoor unit according to a preset second period.
The initialization module 101 is specifically configured to:
detecting whether a subcooler is included in the outdoor unit, if the outdoor unit includes the subcooler, initializing the opening degree of the second electronic expansion valve to (e + f) pls, and if the outdoor unit does not include the subcooler, initializing the opening degree of the second electronic expansion valve to (e-f) pls, wherein e is determined according to a critical opening and closing point of the closable expansion valve, and f is determined according to a critical opening and closing point deviation value.
The initialization module 101 is further specifically configured to:
when the outdoor unit does not include the subcooler, the opening degree range of the second electronic expansion valve is configured to be (e-f) pls to 480 pls;
when the outdoor unit includes the subcooler, the opening degree range of the second electronic expansion valve is set to (e + f) pls to 480 pls.
The multi-split system provided in this embodiment can be used to execute the method shown in fig. 4, and the execution manner and the beneficial effects thereof are similar to those of the embodiment shown in fig. 4, and are not described again here.
Fig. 10 is a schematic structural diagram of a multi-split system according to a tenth embodiment of the present invention, and as shown in fig. 10, in the multi-split system according to the embodiment shown in fig. 9, an outdoor unit of the system further includes:
a fifth obtaining module 102, configured to obtain a suction temperature and an evaporation temperature of a compressor in the outdoor unit;
a third determining module 103, configured to determine a suction superheat degree of the outdoor unit according to the suction temperature and the evaporation temperature;
the second executing module 100 is further configured to compare the suction superheat degree with a preset fifth threshold, and if the suction superheat degree is greater than or equal to the fifth threshold, forcibly open the second electronic expansion valve.
The multi-split system provided in this embodiment can be used to execute the method shown in fig. 5, and the execution manner and the beneficial effects thereof are similar to those of the embodiment shown in fig. 5, and are not described again here.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (18)
1. A method for adjusting a multi-split air conditioner, comprising:
acquiring a temperature value set by a user and an inlet air temperature value of an indoor unit;
generating first control information according to the magnitude relation between the temperature value set by the user and the inlet air temperature value;
and adjusting the opening degree of a first electronic expansion valve of the indoor unit according to the first control information.
2. The method of claim 1, wherein generating first control information according to the magnitude relationship between the user-set temperature value and the intake air temperature value comprises:
if the temperature value set by the user is greater than the wind temperature value, generating the first control information for expanding the opening;
if the temperature value set by the user is smaller than the wind temperature value, generating the first control information for reducing the opening;
and if the temperature value set by the user is equal to the wind temperature value, generating the first control information for maintaining the opening degree.
3. The method according to claim 2, wherein the first control information includes step number information for controlling the opening degree of the first electronic expansion valve, wherein the step number information is obtained from fuzzy control and PID control calculation.
4. The method of claim 1, further comprising:
acquiring a liquid pipe temperature value and an air pipe temperature value of the indoor unit;
determining the superheat degree of a heat exchanger of the indoor unit according to the liquid pipe temperature value and the air pipe temperature value, and determining the executable operation of the first electronic expansion valve according to the superheat degree of the heat exchanger, or,
and determining the operation which can be executed by the first electronic expansion valve according to the air pipe temperature value.
5. The method of claim 4, wherein said determining an operation performable by said first electronic expansion valve based on said heat exchanger superheat degree comprises:
comparing the superheat degree of the heat exchanger with a preset first threshold value, and if the superheat degree of the heat exchanger is greater than or equal to the first threshold value, determining that the operation which can be executed by the first electronic expansion valve is a valve opening operation; or,
and comparing the superheat degree of the heat exchanger with a preset second threshold value, and if the superheat degree of the heat exchanger is less than or equal to the second threshold value, determining that the operation executable by the first electronic expansion valve is a valve closing operation.
6. The method of claim 4, wherein said determining an operation performable by said first electronic expansion valve based on said air tube temperature value comprises:
calculating a difference value between the inlet air temperature value and a preset third threshold value, and comparing the difference value with the air pipe temperature value;
and if the difference value is less than or equal to the air pipe temperature value, determining that the operation which can be executed by the first electronic expansion valve is a valve opening operation.
7. The method of claim 1, further comprising:
acquiring the current opening degree of the first electronic expansion valve;
and determining the operation which can be executed by the first electronic expansion valve according to the opening degree.
8. The method of claim 7, wherein determining an operation performable by the first electronic expansion valve based on the opening degree comprises:
and comparing the opening degree with a preset fourth threshold value, and if the opening degree is smaller than or equal to the fourth threshold value, determining that the operation which can be executed by the first electronic expansion valve is a valve opening operation.
9. The method according to any one of claims 1 to 8, wherein the obtaining of the temperature value set by the user and the temperature value of the inlet air of the indoor unit comprises:
and acquiring the temperature value set by the user and the inlet air temperature value according to a preset first period.
10. The utility model provides a many online systems, the system includes indoor set and off-premises station, its characterized in that, indoor set includes:
the first acquisition module is used for acquiring a temperature value set by a user and an inlet air temperature value of the indoor unit;
the first generation module is used for generating first control information according to the size relationship between the temperature value set by the user and the inlet air temperature value;
and the first execution module is used for adjusting the opening degree of a first electronic expansion valve of the indoor unit according to the first control information.
11. The multi-split system according to claim 10, wherein the first generating module is specifically configured to:
if the temperature value set by the user is greater than the wind temperature value, generating the first control information for expanding the opening;
if the temperature value set by the user is smaller than the wind temperature value, generating the first control information for reducing the opening;
and if the temperature value set by the user is equal to the wind temperature value, generating the first control information for maintaining the opening degree.
12. The multi-split system as claimed in claim 11, wherein the first control information includes step number information for controlling the opening degree of the first electronic expansion valve;
the first generation module includes:
and the first calculation submodule is used for calculating and obtaining the step number information according to fuzzy control and PID control.
13. The multi-split system as claimed in claim 10, wherein the indoor unit further comprises:
the second acquisition module is used for acquiring a liquid pipe temperature value and an air pipe temperature value of the indoor unit;
a first determining module, configured to determine a degree of superheat of a heat exchanger of the indoor unit according to the liquid pipe temperature value and the air pipe temperature value, and determine an operation that can be performed by the first electronic expansion valve according to the degree of superheat of the heat exchanger, or,
and determining the operation which can be executed by the first electronic expansion valve according to the air pipe temperature value.
14. The multi-split system as claimed in claim 13, wherein the first determining module comprises:
the first determining submodule is used for comparing the superheat degree of the heat exchanger with a preset first threshold value, and if the superheat degree of the heat exchanger is larger than or equal to the first threshold value, the executable operation of the first electronic expansion valve is determined as a valve opening operation; or,
and comparing the superheat degree of the heat exchanger with a preset second threshold value, and if the superheat degree of the heat exchanger is less than or equal to the second threshold value, determining that the operation executable by the first electronic expansion valve is a valve closing operation.
15. The multi-split system as claimed in claim 13, wherein the first determining module comprises: a second determination submodule;
the second determination submodule is used for calculating a difference value between the inlet air temperature value and a preset third threshold value and comparing the difference value with the air pipe temperature value;
and if the difference value is less than or equal to the air pipe temperature value, determining that the operation which can be executed by the first electronic expansion valve is a valve opening operation.
16. The multi-split system as claimed in claim 10, wherein the indoor unit further comprises:
the third acquisition module is used for acquiring the current opening degree of the first electronic expansion valve;
and the second determination module is used for determining the executable operation of the first electronic expansion valve according to the opening degree.
17. The multi-split system as claimed in claim 16, wherein the second determining module is specifically configured to:
and comparing the opening degree with a preset fourth threshold value, and if the opening degree is smaller than or equal to the fourth threshold value, determining that the operation which can be executed by the first electronic expansion valve is a valve opening operation.
18. The multi-split system according to any one of claims 10 to 17, wherein the first obtaining module is specifically configured to:
and acquiring the temperature value set by the user and the inlet air temperature value according to a preset first period.
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