CN109357443B - Electronic expansion valve opening control method and device and multi-split system - Google Patents

Electronic expansion valve opening control method and device and multi-split system Download PDF

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Publication number
CN109357443B
CN109357443B CN201811216114.4A CN201811216114A CN109357443B CN 109357443 B CN109357443 B CN 109357443B CN 201811216114 A CN201811216114 A CN 201811216114A CN 109357443 B CN109357443 B CN 109357443B
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Prior art keywords
temperature
opening degree
expansion valve
electronic expansion
preset
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CN201811216114.4A
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CN109357443A (en
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张坤坤
任小辉
黄春
刘合心
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a method and a device for controlling the opening of an electronic expansion valve and a multi-split system, and relates to the technical field of air conditioners. The method and the device are used for calculating the fitting opening degree according to the acquired indoor environment temperature when a liquid pipe temperature sensing bulb of an indoor unit is loosened, adjusting the opening degree of the electronic expansion valve to the fitting opening degree, then acquiring the air suction temperature and the evaporation temperature, and then continuously adjusting the opening degree of the electronic expansion valve according to the air suction temperature and the evaporation temperature. When the liquid pipe temperature sensing bulb is loosened, the opening degree of the electronic expansion valve is adjusted to be the fitting opening degree of the electronic expansion valve at the current indoor environment temperature without controlling the opening degree of the electronic expansion valve by using the superheat degree of the refrigerating indoor machine, and then the opening degree of the electronic expansion valve is further adjusted according to the air suction temperature and the evaporation temperature, so that the flow of the electronic expansion valve can still be accurately controlled when the liquid pipe temperature sensing bulb is loosened, and the problem of poor refrigerating effect caused by small opening degree of the electronic expansion valve is solved.

Description

Electronic expansion valve opening control method and device and multi-split system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for controlling the opening of an electronic expansion valve and a multi-split system.
Background
The multi-split air-conditioning system is a type of central air-conditioning system for users, and refers to a primary refrigerant air-conditioning system in which one outdoor unit is connected with two or more indoor units through a pipe, the outdoor side adopts an air cooling heat exchange mode, and the indoor side adopts a direct evaporation heat exchange mode.
However, the condition that the liquid pipe temperature sensing bulb of the inner machine is loosened or falls off frequently occurs in the inner machine of the multi-split system due to reasons such as production, installation, transportation and the like, and the display value of the liquid pipe temperature sensing bulb is larger, so that the superheat degree of the refrigerating inner machine is calculated to be smaller, the opening degree of the electronic expansion valve is smaller, and the inner machine is not provided with sufficient refrigerant circulation, and the refrigerating effect is seriously affected.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for controlling an opening of an electronic expansion valve, and a multi-split system, so as to solve the above problems.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, the present invention provides an electronic expansion valve opening control method for adjusting an opening of an electronic expansion valve of any indoor unit of a multi-split system, where the electronic expansion valve opening control method includes:
when a liquid pipe temperature sensing bulb of an indoor unit is loosened, calculating fitting opening according to the acquired indoor environment temperature;
adjusting the opening degree of the electronic expansion valve to the fitting opening degree;
acquiring the air suction temperature and the evaporation temperature;
and continuously adjusting the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
Further, the step of continuously adjusting the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature includes:
calculating an intake air superheat degree based on the intake air temperature and the evaporation temperature;
when SC is less than or equal to m1,t≥time1Then, the opening degree of the electronic expansion valve is adjusted downwards according to a preset adjustment amount at intervals of a preset time interval until the opening degree of the electronic expansion valve reaches a preset minimum opening degree value; where SC is the degree of superheat of the suction gas, m1A preset first threshold value, t is the time for maintaining the state that the degree of superheat of the inspiration is less than or equal to the preset first threshold value, and time1Is the first preset time.
Further, the step of continuously adjusting the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature further includes:
when SC>m1And keeping the opening degree of the electronic expansion valve unchanged.
Further, the step of calculating the degree of superheat of the intake air based on the intake air temperature and the evaporation temperature includes:
by the formula SC ═ Ts-TpsCalculating the degree of superheat of the suction gas; where SC is the degree of superheat of the suction gas, TsIs the suction temperature, TpsIs the evaporation temperature.
Further, before the step of calculating a fitting opening degree according to the acquired indoor environment temperature, the method for controlling the opening degree of the electronic expansion valve further includes:
acquiring the liquid pipe temperature, the indoor environment temperature, the current opening value of the electronic expansion valve, the first air pipe temperature and other second air pipe temperatures of the indoor unit;
calculating an air pipe temperature average value based on a plurality of the second air pipe temperatures;
and judging whether the liquid pipe temperature sensing bulb is loosened or not based on the liquid pipe temperature, the indoor environment temperature, the current electronic expansion valve opening value, the first air pipe temperature and the air pipe temperature average value.
Further, the step of determining whether the liquid tube bulb is loose based on the liquid tube temperature, the indoor environment temperature, the current electronic expansion valve opening value, the first air tube temperature, and the air tube temperature average value includes:
when T isy≥Tai-C1，Dd＝Dmin，Tq1>Tq2_aveJudging that the liquid tube temperature sensing bulb is loosened; wherein, TyIs the temperature of the liquid tube, TaiIs the indoor ambient temperature, C1Is a preset first temperature threshold, DdFor the current electronic expansion valve opening value, DminFor a predetermined minimum opening value, Tq1Is the first gas tube temperature, Tq2_aveMean tracheal temperature values.
Further, the step of calculating the fitting opening degree according to the acquired indoor environment temperature includes:
by calculating formula B ═ D1-k*(D2-Tai) Calculating the fitting opening degree; wherein B is fitting opening degree, TaiK is a preset proportionality coefficient for the indoor ambient temperature, D1Is a preset first constant coefficient, D2Is a preset second constant coefficient.
In a second aspect, the present invention provides an electronic expansion valve opening degree control device for adjusting an opening degree of an electronic expansion valve of any indoor unit of a multi-split air conditioning system, the electronic expansion valve opening degree control device comprising:
the calculation unit is used for calculating the fitting opening according to the acquired indoor environment temperature when a liquid pipe temperature sensing bulb of an indoor unit is loosened;
an opening degree adjusting unit for adjusting the opening degree of the electronic expansion valve to the fitting opening degree;
the parameter acquisition unit is used for acquiring air suction temperature and evaporation temperature;
the opening degree adjusting unit is further used for continuously adjusting the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
Further, the opening degree adjusting unit is used for calculating the suction superheat degree based on the suction temperature and the evaporation temperature;
the opening degree adjusting unit is also used for adjusting the opening degree when SC is less than or equal to m1,t≥time1Then, the opening degree of the electronic expansion valve is adjusted downwards according to a preset adjustment amount at intervals of a preset time interval until the opening degree of the electronic expansion valve reaches a preset minimum opening degree value; where SC is the degree of superheat of the suction gas, m1A preset first threshold value, t is the time for maintaining the state that the degree of superheat of the inspiration is less than or equal to the preset first threshold value, and time1Is the first preset time.
In a third aspect, the present invention further provides a multi-split system, including:
a memory;
a controller; and
an electronic expansion valve opening control device mounted to the memory and including one or more software function modules executed by the controller, the electronic expansion valve opening control device comprising:
the calculation unit is used for calculating the fitting opening according to the acquired indoor environment temperature when a liquid pipe temperature sensing bulb of an indoor unit is loosened;
an opening degree adjusting unit for adjusting the opening degree of the electronic expansion valve to the fitting opening degree;
the parameter acquisition unit is used for acquiring air suction temperature and evaporation temperature;
the opening degree adjusting unit is further used for continuously adjusting the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
Compared with the prior art, the method and the device for controlling the opening of the electronic expansion valve have the following advantages that:
when a liquid pipe temperature sensing bulb of an indoor unit is loosened, calculating a fitting opening degree according to the acquired indoor environment temperature, adjusting the opening degree of the electronic expansion valve to the fitting opening degree, then acquiring an air suction temperature and an evaporation temperature, and then continuously adjusting the opening degree of the electronic expansion valve according to the air suction temperature and the evaporation temperature. When the liquid pipe temperature sensing bulb is loosened, the opening degree of the electronic expansion valve is adjusted to be the fitting opening degree of the electronic expansion valve at the current indoor environment temperature without controlling the opening degree of the electronic expansion valve by using the superheat degree of the refrigerating indoor machine, and then the opening degree of the electronic expansion valve is further adjusted according to the air suction temperature and the evaporation temperature, so that the flow of the electronic expansion valve can still be accurately controlled when the liquid pipe temperature sensing bulb is loosened, and the problem of poor refrigerating effect caused by small opening degree of the electronic expansion valve is solved.
Compared with the prior art, the multi-split system and the method and the device for controlling the opening degree of the electronic expansion valve have the same advantages, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a system block diagram of a multi-split system according to an embodiment of the present invention.
Fig. 2 is a block diagram of a circuit structure of a multi-split system according to an embodiment of the present invention.
Fig. 3 is a flowchart of an opening control method of an electronic expansion valve according to an embodiment of the present invention.
Fig. 4 is a detailed flowchart of step S307 in fig. 3.
Fig. 5 is a functional block diagram of an electronic expansion valve opening degree control device according to an embodiment of the present invention.
Icon: 1-a multi-split system; 2, an outdoor unit; 3-an indoor unit; 4-a controller; 5-a memory; 6-a parameter acquisition module; 7-electronic expansion valve opening degree control device; 8-a parameter acquisition unit; 9-a calculation unit; 10-a judgment unit; 11-opening degree adjusting unit.
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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The invention provides a multi-split system 1 for adjusting indoor environment temperature. Fig. 1 is a system block diagram of a multi-split system 1 according to an embodiment of the present invention. The multiple on-line system 1 includes an outdoor unit 2 and a plurality of indoor units 3, and the outdoor unit 2 is communicated with each indoor unit 3.
Fig. 2 is a block diagram of a circuit structure of a multi-split system 1 according to an embodiment of the present invention. The multi-split system 1 comprises a memory 5, a controller 4, a parameter acquisition module 6 and an electronic expansion valve opening control device 7. The controller 4 is electrically connected with the memory 5 and the parameter acquisition module 6. The electronic expansion valve opening degree control means 7 comprises at least one of software or firmware (firmware) stored in the memory 5.
The memory 5 may be configured to store software programs and units, such as program instructions/units corresponding to the electronic expansion valve opening degree control device 7 and the method in the embodiment of the present invention, and the controller 4 executes various functional applications and data processing by running the software programs and units of the electronic expansion valve opening degree control device and the method stored in the memory 5, such as the electronic expansion valve opening degree control method provided in the embodiment of the present invention.
The Memory 5 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like.
The parameter collecting module 6 is used for collecting the operating parameters of the multi-split system 1.
Specifically, the parameter acquisition module 6 includes a liquid tube bulb and at least four temperature sensors. The liquid tube temperature sensing bulb and a plurality of temperature sensors are all electrically connected with the controller 4.
The liquid tube bulb is used for collecting the liquid tube temperature and transmitting the liquid tube temperature to the controller 4.
The at least four temperature sensors are respectively used for collecting indoor environment temperature, air suction temperature, evaporation temperature and air pipe temperature, and respectively transmit the collected indoor environment temperature, air suction temperature, evaporation temperature and air pipe temperature to the controller 4.
It is to be understood that the configuration shown in fig. 2 is merely illustrative, and that the multi-split system 1 may include more or fewer components than those shown in fig. 2, or have a different configuration than that shown in fig. 2. The components shown in fig. 2 may be implemented in hardware, software, or a combination thereof.
First embodiment
The embodiment of the invention provides an opening control method of an electronic expansion valve, which is used for accurately controlling the flow through the electronic expansion valve under the condition that a liquid pipe temperature sensing bulb is loosened. Referring to fig. 3, a flowchart of an opening control method of an electronic expansion valve according to an embodiment of the present invention is shown. The opening control method of the electronic expansion valve comprises the following steps:
step S301: the liquid pipe temperature, the indoor environment temperature, the current electronic expansion valve opening value, the first air pipe temperature and the second air pipe temperature of the other indoor units 3 of the indoor unit 3 are obtained.
The liquid pipe temperature, the indoor environment temperature, the current opening value of the electronic expansion valve and the first air pipe temperature are all operation parameters of a target indoor unit, and the target indoor unit is the indoor unit 3 which is likely to have the liquid pipe temperature sensing bulb loosening phenomenon. And the second air pipe temperatures are the air pipe temperatures of the other indoor units 3 except the target indoor unit in all the indoor units 3 included in the multi-split system 1.
Step S302: and calculating an average value of the gas pipe temperature based on the plurality of second gas pipe temperatures.
The average value of the air pipe temperatures of the indoor units 3 other than the target indoor unit is calculated.
Step S303: judging whether the liquid pipe temperature sensing bulb is loosened or not based on the liquid pipe temperature, the indoor environment temperature, the current opening value of the electronic expansion valve, the first air pipe temperature and the average value of the air pipe temperatures, and if so, executing a step S304; if not, step S301 is re-executed.
Specifically, when T isy≥Tai-C1，Dd＝Dmin，Tq1>Tq2_aveJudging whether the liquid tube temperature sensing bulb is loosened; wherein, TyIs the temperature of the liquid tube, TaiIs the indoor ambient temperature, C1Is a preset first temperature threshold, DdFor the current electronic expansion valve opening value, DminFor a predetermined minimum opening value, Tq1Is the first gas tube temperature, Tq2_aveMean tracheal temperature values.
When the liquid pipe temperature sensing bulb is in a normal state, the temperature of the liquid pipe is the temperature collected by the liquid pipe temperature sensing bulb after a refrigerant passes through the electronic expansion valve, and under the normal refrigeration condition, the temperature of the liquid pipe is far lower than the indoor environment temperature; on the contrary, when the liquid tube temperature sensing bulb loosens or falls off, the temperature of the liquid tube obviously rises, so that when T is measuredy≥Tai-C1I.e. Tai-Ty<C1That is, when the difference between the indoor ambient temperature and the liquid pipe temperature is smaller than the preset first temperature threshold, it indicates that the liquid pipe temperature sensing bulb may be loosened.
The preset first temperature threshold C is1The range of (1) is 2 to 6. In a preferred embodiment, the first temperature threshold C is preset1Is 3.
Meanwhile, if the liquid pipe temperature sensing bulb loosens or falls off, the liquid pipe temperature is larger, but the air pipe temperature is normal at the moment, so that the indoor unit superheat degree (the indoor unit superheat degree is equal to the air pipe temperature-the liquid pipe temperature) is smaller, and the opening degree of the electronic expansion valve is gradually reduced to the minimum opening degree value. Therefore, it can be known through reverse reasoning that when D is usedd＝DminThat is, when the opening value of the electronic expansion valve is the preset minimum opening value, it indicates that the liquid tube bulb may be loosened.
The opening value of the electronic expansion valve is the preset minimum opening value, the refrigerant quantity of the evaporator is insufficient, the heat exchange quantity of the inner machine is not changed, and the temperature of the air pipe is higher than that of the normal inner machineThe tracheal temperature of (a). Thus, when T isq1>Tq2_aveThat is, when the temperature of the first air pipe is higher than the average value of the air pipe temperature, the liquid pipe temperature sensing bulb is possible to loosen.
By combining the above, whether the difference between the indoor environment temperature and the liquid tube temperature is smaller than the preset first temperature threshold, whether the opening value of the current electronic expansion valve is the preset minimum opening value, and whether the first air tube temperature is larger than the average air tube temperature value can be judged more accurately.
Step S304: and calculating the fitting opening according to the acquired indoor environment temperature.
The fitting opening degree is an approximate opening degree of the electronic expansion valve corresponding to the indoor environment temperature when the indoor unit 3 is matched with the outdoor unit of the model and the indoor unit 3 is in normal operation.
Specifically, by the formula B ═ D1-k*(D2-Tai) Calculating the fitting opening degree; wherein B is fitting opening degree, TaiK is a preset proportionality coefficient for the indoor ambient temperature, D1Is a preset first constant coefficient, D2Is a preset second constant coefficient.
Wherein a preset first constant coefficient D1In a preferred embodiment, the predetermined first constant coefficient D is in a range of 100 to 3001Is 150; the range of the preset proportionality coefficient k is 2-10, and in a preferred embodiment, the preset proportionality coefficient k is 5; a preset second constant coefficient D2Is in the range of 18 to 52, and in a preferred embodiment, a predetermined second constant coefficient D2Is 27.
It should be noted that the preset scaling factors k and D1Is a preset first constant coefficient and D2The range of the preset second constant coefficient can be determined by the historical indoor ambient temperature and the fitting opening degree corresponding to the indoor ambient temperature.
Step S305: and adjusting the opening degree of the electronic expansion valve to be a fitting opening degree.
Step S306: the suction temperature and the evaporation temperature are acquired.
It is understood that the suction temperature and the evaporation temperature of the target indoor unit are obtained in this step.
Step S307: and continuously adjusting the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
Please refer to fig. 4, which is a flowchart illustrating the step S307. The step S307 includes:
substep S3071: the suction superheat is calculated based on the suction temperature and the evaporation temperature.
Specifically, the formula SC ═ Ts-TpsCalculating the degree of superheat of the suction gas; where SC is the degree of superheat of the suction gas, TsIs the suction temperature, TpsIs the evaporation temperature.
Substep S3072: judging whether the degree of superheat of the inspiration is less than or equal to a preset first threshold value, if so, executing a substep S3074; if not, then substep S3073 is performed.
Whether the current opening degree of the electronic expansion valve is proper or not can be determined by judging whether the suction superheat degree is less than or equal to a preset first threshold value, and if the suction superheat degree is less than or equal to the preset first threshold value, the current opening degree is not proper and needs to be adjusted; otherwise, the current opening degree is appropriate and is kept.
Substep S3073: the opening degree of the electronic expansion valve is kept unchanged.
That is, when SC>m1Keeping the opening degree of the electronic expansion valve unchanged; where SC is the degree of superheat of the suction gas, m1Is a preset first threshold value.
Substep S3074: judging whether the time for maintaining the state that the degree of superheat of the inspiration is less than or equal to a preset first threshold value is greater than or equal to a first preset time, if so, executing a substep S3075; if not, then substep S3074 is re-executed.
When the degree of superheat of the intake air is less than or equal to the preset first threshold, further acquiring a time for maintaining a state where the degree of superheat of the intake air is less than or equal to the preset first threshold, and then judging whether the time for maintaining the state where the degree of superheat of the intake air is less than or equal to the preset first threshold is greater than or equal to the first preset time, so as to further determine the accuracy of the judgment result.
Substep S3075: and adjusting the opening degree of the electronic expansion valve downwards according to a preset adjustment amount at preset time intervals until the opening degree of the electronic expansion valve reaches a preset minimum opening value.
That is, when SC is less than or equal to m1,t≥time1Then, the opening degree of the electronic expansion valve is adjusted downwards according to a preset adjustment quantity at intervals of a preset time interval until the opening degree of the electronic expansion valve reaches a preset minimum opening degree value; where SC is the degree of superheat of the suction gas, m1A preset first threshold value, t is the time for maintaining the state that the degree of superheat of the inspiration is less than or equal to the preset first threshold value, and time1Is the first preset time.
The range of the suction superheat SC is-3 to 6, and in a preferred embodiment, the suction superheat SC is 3; the preset adjustment amount is in the range of 2-12, and in a preferred embodiment, a is 4.
Second embodiment
Referring to fig. 5, fig. 5 is a functional block diagram of an electronic expansion valve opening degree control device 7 according to a preferred embodiment of the invention. It should be noted that the basic principle and the technical effects of the electronic expansion valve opening degree control device 7 provided in the present embodiment are the same as those of the above embodiment, and for the sake of brief description, no part of the present embodiment is mentioned, and the corresponding contents in the above embodiment can be referred to. The electronic expansion valve opening degree control device 7 includes a parameter acquisition unit 8, a calculation unit 9, a determination unit 10, and an opening degree adjustment unit 11.
The parameter obtaining unit 8 is configured to obtain a liquid pipe temperature of an indoor unit 3, an indoor environment temperature, a current opening value of the electronic expansion valve, a first air pipe temperature, and a second air pipe temperature of the other indoor units 3.
It is to be understood that, in a preferred embodiment, the parameter obtaining unit 8 is operable to perform step S301.
The calculation unit 9 is configured to calculate an average value of the gas pipe temperature based on the plurality of second gas pipe temperatures.
It is to be understood that in a preferred embodiment, the calculation unit 9 is operable to perform step S302.
The determination unit 10 is configured to determine whether the liquid tube bulb is loose based on the liquid tube temperature, the indoor ambient temperature, the current electronic expansion valve opening value, the first air tube temperature, and the air tube temperature average value.
It is to be understood that, in a preferred embodiment, the judging unit 10 is operable to execute step S303.
The calculating unit 9 is further configured to calculate a fitting opening degree according to the acquired indoor environment temperature when the liquid tube bulb is loosened.
It is to be understood that in a preferred embodiment, the calculation unit 9 is operable to perform step S304.
The opening degree adjusting unit 11 is configured to adjust the opening degree of the electronic expansion valve to a fitting opening degree.
It is understood that, in a preferred embodiment, the opening degree adjusting unit 11 can be used for executing the step S305.
The parameter acquiring unit 8 is also used for acquiring the suction temperature and the evaporation temperature.
It is to be understood that, in a preferred embodiment, the parameter obtaining unit 8 is operable to execute step S306.
The opening degree adjusting unit 11 is further configured to continuously adjust the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
Specifically, the opening degree adjustment unit 11 is configured to calculate the degree of superheat of intake air based on the intake air temperature and the evaporation temperature, and determine whether the degree of superheat of intake air is less than or equal to a preset first threshold value. The opening degree adjusting unit 11 is also used for adjusting the opening degree when SC>m1Keeping the opening degree of the electronic expansion valve unchanged; when SC is less than or equal to m1,t≥time1And then, the opening degree of the electronic expansion valve is adjusted downwards according to the preset adjustment amount at preset time intervals until the opening degree of the electronic expansion valve reaches a preset minimum opening degree value.
It is to be understood that, in a preferred embodiment, the opening degree adjusting unit 11 can be used to perform step S307, sub-step S3071, sub-step S3072, sub-step S3073, sub-step S3074 and sub-step S3075.
In summary, the method and apparatus for controlling the opening of the electronic expansion valve according to the present invention are used to calculate the fitting opening according to the acquired indoor environment temperature when the liquid-tube thermal bulb of an indoor unit is loosened, adjust the opening of the electronic expansion valve to the fitting opening, then acquire the air suction temperature and the evaporation temperature, and then continue to adjust the opening of the electronic expansion valve according to the air suction temperature and the evaporation temperature. When the liquid pipe temperature sensing bulb is loosened, the opening degree of the electronic expansion valve is adjusted to be the fitting opening degree of the electronic expansion valve at the current indoor environment temperature without controlling the opening degree of the electronic expansion valve by using the superheat degree of the refrigerating indoor machine, and then the opening degree of the electronic expansion valve is further adjusted according to the air suction temperature and the evaporation temperature, so that the flow of the electronic expansion valve can still be accurately controlled when the liquid pipe temperature sensing bulb is loosened, and the problem of poor refrigerating effect caused by small opening degree of the electronic expansion valve is solved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (9)

1. An opening control method of an electronic expansion valve is used for adjusting the opening of the electronic expansion valve of any indoor unit (3) of a multi-split system (1), and is characterized by comprising the following steps:
when the liquid pipe temperature sensing bulb of an indoor unit (3) looses, the formula B is equal to D1-k*(D2-Tai) Calculating the fitting opening degree; wherein B is fitting opening degree, TaiK is a preset proportionality coefficient for the obtained indoor environment temperature, D1Is a preset first constant coefficient, D2The second constant coefficient is preset;
adjusting the opening degree of the electronic expansion valve to the fitting opening degree;
acquiring the air suction temperature and the evaporation temperature;
and continuously adjusting the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
2. The method of claim 1, wherein the step of continuing to adjust the opening of the electronic expansion valve in accordance with the intake air temperature and the evaporation temperature comprises:
calculating an intake air superheat degree based on the intake air temperature and the evaporation temperature;
when SC is less than or equal to m1,t≥time1Then, the opening degree of the electronic expansion valve is adjusted downwards according to a preset adjustment amount at intervals of a preset time interval until the opening degree of the electronic expansion valve reaches a preset minimum opening degree value; where SC is the degree of superheat of the suction gas, m1A preset first threshold value, t is the time for maintaining the state that the degree of superheat of the inspiration is less than or equal to the preset first threshold value, and time1Is the first preset time.
3. The method of claim 2, wherein the step of continuing to adjust the opening of the electronic expansion valve based on the intake air temperature and the evaporation temperature further comprises:
when SC>m1And keeping the opening degree of the electronic expansion valve unchanged.
4. The electronic expansion valve opening degree control method according to claim 2 or 3, wherein the step of calculating the intake air superheat degree based on the intake air temperature and the evaporation temperature includes:
by the formula SC ═ Ts-TpsCalculating the degree of superheat of the suction gas; where SC is the degree of superheat of the suction gas, TsIs the suction temperature, TpsIs the evaporation temperature.
5. The method of claim 1, wherein the passage equation B-D is set as1-k*(D2-Tai) Before the step of calculating the fitting opening degree, the method for controlling the opening degree of the electronic expansion valve further comprises the following steps of:
acquiring the liquid pipe temperature of the indoor unit (3), the indoor environment temperature, the opening value of the current electronic expansion valve, the first air pipe temperature and other second air pipe temperatures of the indoor unit (3);
calculating an air pipe temperature average value based on a plurality of the second air pipe temperatures;
and judging whether the liquid pipe temperature sensing bulb is loosened or not based on the liquid pipe temperature, the indoor environment temperature, the current electronic expansion valve opening value, the first air pipe temperature and the air pipe temperature average value.
6. The method of claim 5, wherein the step of determining whether the liquid tube bulb is loose based on the liquid tube temperature, the indoor ambient temperature, the current electronic expansion valve opening value, the first gas tube temperature, and the gas tube temperature average value comprises:
when T isy≥Tai-C1，Dd＝Dmin，Tq1>Tq2_aveJudging that the liquid tube temperature sensing bulb is loosened; wherein, TyIs the temperature of the liquid tube, TaiIs the indoor ambient temperature, C1Is a preset first temperature threshold, DdFor the current electronic expansion valve opening value, DminFor a predetermined minimum opening value, Tq1Is the first gas tube temperature, Tq2_aveMean tracheal temperature values.
7. An opening control device of an electronic expansion valve is used for adjusting the opening of the electronic expansion valve of any indoor unit (3) of a multi-split system (1), and is characterized in that the opening control device (7) of the electronic expansion valve comprises:
a computing unit (9) for acting as a liquid-tube bulb of an indoor unit (3)When loose, the formula B is equal to D1-k*(D2-Tai) Calculating the fitting opening degree; wherein B is fitting opening degree, TaiK is a preset proportionality coefficient for the obtained indoor environment temperature, D1Is a preset first constant coefficient, D2The second constant coefficient is preset;
an opening degree adjustment unit (11) for adjusting the opening degree of the electronic expansion valve to the fitting opening degree;
a parameter acquisition unit (8) for acquiring an intake air temperature and an evaporation temperature;
the opening degree adjusting unit (11) is further configured to continuously adjust the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
8. An electronic expansion valve opening degree control device according to claim 7, wherein the opening degree adjusting unit (11) is configured to calculate a suction superheat degree based on the suction temperature and the evaporation temperature;
the opening degree adjusting unit (11) is also used for adjusting the opening degree when SC is less than or equal to m1,t≥time1Then, the opening degree of the electronic expansion valve is adjusted downwards according to a preset adjustment amount at intervals of a preset time interval until the opening degree of the electronic expansion valve reaches a preset minimum opening degree value; where SC is the degree of superheat of the suction gas, m1A preset first threshold value, t is the time for maintaining the state that the degree of superheat of the inspiration is less than or equal to the preset first threshold value, and time1Is the first preset time.
9. A multiple on-line system, characterized in that the multiple on-line system (1) comprises:
a memory (5);
a controller (4); and
an electronic expansion valve opening degree control device (7), the electronic expansion valve opening degree control device (7) being mounted to the memory (5) and including one or more software function modules executed by the controller (4), the electronic expansion valve opening degree control device (7) comprising:
a computing unit (9) forWhen the liquid pipe temperature sensing bulb of an indoor unit (3) looses, the formula B is equal to D1-k*(D2-Tai) Calculating the fitting opening degree; wherein B is fitting opening degree, TaiK is a preset proportionality coefficient for the obtained indoor environment temperature, D1Is a preset first constant coefficient, D2The second constant coefficient is preset;
an opening degree adjustment unit (11) for adjusting the opening degree of the electronic expansion valve to the fitting opening degree;
a parameter acquisition unit (8) for acquiring an intake air temperature and an evaporation temperature;
the opening degree adjusting unit (11) is further configured to continuously adjust the opening degree of the electronic expansion valve according to the suction temperature and the evaporation temperature.
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