CN111649461A - Control method for opening degree of expansion valve of air conditioner - Google Patents
Control method for opening degree of expansion valve of air conditioner Download PDFInfo
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- CN111649461A CN111649461A CN202010562584.7A CN202010562584A CN111649461A CN 111649461 A CN111649461 A CN 111649461A CN 202010562584 A CN202010562584 A CN 202010562584A CN 111649461 A CN111649461 A CN 111649461A
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- superheat degree
- expansion valve
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- opening degree
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- 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
- 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)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
In the method for controlling the opening degree of the expansion valve of the air conditioner, firstly, the current temperature difference of each indoor unit in a starting state and the preset initial superheat degree of the outdoor unit are obtained, so that the target superheat degree of the corresponding indoor unit is calculated according to the current temperature difference and the initial superheat degree, when the number of the indoor units is large, the difference of installation environments where the indoor units are located is obvious, and the problem that the refrigerating capacity of the indoor units is difficult to exert due to the fact that the temperature difference of the installation environments of the indoor units is not considered can be solved by obtaining the temperature difference of different indoor units; then, determining the current superheat degree according to the obtained difference value between the outlet temperature of the heat exchanger and the inlet temperature of the heat exchanger; and finally, adjusting the opening degree of the electronic expansion valve according to the difference value between the current superheat degree and the target superheat degree, and flexibly controlling the opening degree of the electronic expansion valve of the indoor unit.
Description
Technical Field
The invention relates to the technical field of air conditioner valve control, in particular to a control method for the opening degree of an expansion valve of an air conditioner.
Background
When there are many indoor units, the installation conditions, environments and use characteristics of each indoor unit are different. During the refrigeration operation, the same target superheat degree is usually adopted to control the opening degrees of the electronic expansion valves of all the indoor units, and if the indoor units are started up and the opening degrees of the electronic expansion valves of a plurality of indoor units are controlled according to the same target value, the refrigeration performance of individual indoor units cannot be effectively exerted, and the uneven distribution of system refrigerants is caused in serious cases, so that the efficiency of the whole machine is reduced.
Disclosure of Invention
The embodiment of the invention aims to provide a control method for the opening of an expansion valve of an air conditioner, which can effectively improve the refrigerating efficiency of a unit, balance the distribution of a system refrigerant and improve the reliability of the whole machine.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling an opening degree of an expansion valve for an air conditioner, including: acquiring a current temperature difference of an indoor unit in a starting state and an initial superheat degree preset by an outdoor unit, and calculating a corresponding target superheat degree of the indoor unit according to the current temperature difference and the initial superheat degree; the current temperature difference is the difference value between the return air temperature of the current indoor unit and a preset reference temperature; determining the current superheat degree according to the obtained difference value between the outlet temperature of the heat exchanger and the inlet temperature of the heat exchanger in the indoor unit in the starting state at present; the indoor units correspond to the heat exchangers one by one; when the difference value between the current superheat degree and the target superheat degree is larger than a preset first reference value, increasing the opening degree of the electronic expansion valve; when the difference value between the current superheat degree and the target superheat degree is smaller than a preset second reference value, reducing the opening degree of the electronic expansion valve; and when the difference value between the current superheat degree and the target superheat degree is smaller than or equal to the first reference value and larger than or equal to the second reference value, keeping the opening degree of the electronic expansion valve unchanged.
Compared with the prior art, in the control method for the opening degree of the expansion valve of the air conditioner, firstly, the current temperature difference of each indoor unit in the starting state and the preset initial superheat degree of the outdoor unit are obtained, so that the target superheat degree of the corresponding indoor unit is calculated according to the current temperature difference and the initial superheat degree, when the number of the indoor units is large, the difference of installation environments where the indoor units are located is obvious, and the problem that the refrigerating capacity of the indoor units is difficult to exert due to the fact that the temperature difference of the installation environments of the indoor units is not considered can be solved by obtaining the temperature difference of the different indoor units; then, determining the current superheat degree according to the obtained difference value between the outlet temperature of the heat exchanger and the inlet temperature of the heat exchanger; and finally, adjusting the opening degree of the electronic expansion valve according to the difference value between the current superheat degree and the target superheat degree, and flexibly controlling the opening degree of the electronic expansion valve of the indoor unit.
Drawings
Fig. 1 is a flowchart of a method for controlling an opening of an expansion valve of an air conditioner according to an 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.
Referring to fig. 1, fig. 1 is a flowchart of a method for controlling an opening of an expansion valve for an air conditioner according to an embodiment of the present invention; the method comprises the following steps:
s11, acquiring the current temperature difference of each indoor unit in the starting state and the preset initial superheat degree of the outdoor unit, and calculating the corresponding target superheat degree of the indoor unit according to the current temperature difference and the initial superheat degree; the current temperature difference is the difference value between the return air temperature of the current indoor unit and a preset reference temperature;
s12, determining the current superheat degree according to the obtained difference value between the outlet temperature of the heat exchanger and the inlet temperature of the heat exchanger; the indoor units correspond to the heat exchangers one by one;
and S13, adjusting the opening degree of the electronic expansion valve of the corresponding indoor unit according to the difference between the current superheat degree and the target superheat degree.
Specifically, in step S11, during the cooling operation of the multi-split system, the electronic expansion valve of the indoor unit is controlled, typically, to adjust the target superheat degree. The description is as follows: after the unit operates stably, the outdoor unit provides a target initial value SHO according to the states of all the indoor units, the value is sent according to the principle that the system is ensured not to suck air and return liquid, and then the system is ensured not to suck air and return liquid according to the exhaust superheat DSH (the exhaust temperature T of the compressor) of the unitd-condensing temperature Tc) and suction superheat SSH (compressor suction temperature Ts-evaporating temperature Te) to correct and calculate the target initial value SHO to obtain initial superheat SHO1. Exemplary, SHO1The adjustment period is updated every 3min, within the range of ∈ (-3min, +3 min).
It should be noted that each indoor unit needs to detect the current temperature difference, because the ambient temperature (return air temperature) of each indoor unit is generally different, and the indoor units are located in different rooms, the reference temperature is generally different, so the reference temperature can be set according to the current indoor unit remote controller or line controller, or the reference temperature can be preset to be a fixed temperature value according to the installation condition of the indoor unit, and the invention is within the protection scope.
Optionally, the calculating a target superheat degree of the corresponding indoor unit according to the current temperature difference and the initial superheat degree specifically includes:
s111, when the current temperature difference delta T is in a first temperature level (0, 2 ℃), the initial superheat degree SHO is subjected to1Performing a positive correction to obtain the target degree of superheat SHOj；
S112, when the current temperature difference delta T is at a second temperature level (2 ℃, 4 ℃), performing sine function on the initial superheat degree SHO1Correcting to obtain the target superheat degree SHOj；
S113, when the current temperature difference delta T is in a third temperature level (4 ℃, 9 ℃), the initial superheat degree SHO is subjected to1Performing a negative correction to obtain the target superheat degree SHOj。
Target overheat value SHO of jth indoor unitjThe delta t used for calculation is differentiated according to the current capacity and type of the indoor unit, delta t ∈ (0, 5 ℃), when the system detects that the degree of superheat SSH of suction is less than or equal to 6 ℃, the SHO is prohibited1And (5) making negative correction. When the quantity of the indoor units is large, the difference of installation environments of the indoor units is obvious, and the problem that the refrigerating capacity of the indoor units is difficult to exert due to the fact that the temperature difference of the installation environments of the indoor units is not considered can be solved by obtaining the temperature difference of the indoor units.
Specifically, in step S12, according to the obtained outlet temperature Tg and inlet temperature T of the heat exchanger in each indoor unit in the on state1Determines the current superheat SHj(SHj＝Tg-T1)。
Specifically, in step S13, the jth starting indoor unit electronic expansion valve EEVjOpening degree according to its target degree of superheat SHOjThe current superheat SH of the machinejAnd (6) adjusting. The method comprises the following steps:
s131, when the difference value between the current superheat degree and the target superheat degree is larger than a preset first reference value (namely SH)j-SHOjBeing positive and larger than the first reference value a), increasing the opening degree of the electronic expansion valve, in particular, increasing the opening degree of the electronic expansion valve by 50-100 °.
S132, when the difference value between the current superheat degree and the target superheat degree is smaller than a preset second reference value (namely SH)j-SHOjNegative and less than a second reference value b), reducing the opening degree of the electronic expansion valve, in particular, reducing the opening degree of the electronic expansion valve by 50-100 °.
S133, when the difference value between the current superheat degree and the target superheat degree is less than or equal to the first reference value and greater than or equal to the second reference value (namely b is less than or equal to SH)j-SHOjA) or less, keeping the opening degree of the electronic expansion valve unchanged and maintaining the opening degree for 2 minutes.
For example, the specific increasing/decreasing opening degree of the electronic expansion valve regulating valve may be defined according to actual conditions, and thus, the opening degree per increasing/decreasing may be preset to a fixed value, which is not specifically limited by the present invention. The control of the electronic expansion valve is performed to achieve the superheat degree of the indoor unit within a reasonable range of the target superheat degree, taking into account the frequency of capturing data, for example, feeding back data every 1 minute or less.
Compared with the prior art, in the control method for the opening degree of the expansion valve of the air conditioner, firstly, the current temperature difference of each indoor unit in the starting state and the initial superheat degree preset by the outdoor unit are obtained, so that the target superheat degree of each indoor unit is calculated according to the current temperature difference and the initial superheat degree, when the number of the indoor units is large, the difference of installation environments where the indoor units are located is obvious, and the problem that the refrigerating capacity of the indoor units is difficult to exert due to the fact that the temperature difference of the installation environments is not considered can be solved by obtaining the temperature difference of the indoor units; then, determining the current superheat degree according to the obtained difference value between the outlet temperature of the heat exchanger and the inlet temperature of the heat exchanger; and finally, adjusting the opening degree of the electronic expansion valve according to the difference value between the current superheat degree and the target superheat degree, and flexibly controlling the opening degree of the electronic expansion valve of the indoor unit.
The embodiment of the invention discloses a control method for the opening degree of an expansion valve of an air conditioner, which recalculates the target superheat value of the valve adjusting of each multi-connected indoor unit, reasonably provides the target superheat value of the valve adjusting according to the characteristics of each indoor unit, ensures that a refrigerating indoor unit fully exerts the refrigerating capacity of the refrigerating indoor unit, ensures the optimal distribution of refrigerant of a unit system, and improves the refrigerating efficiency of the whole machine.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (2)
1. A control method of an opening degree of an expansion valve for an air conditioner, comprising:
acquiring a current temperature difference of an indoor unit in a starting state and an initial superheat degree preset by an outdoor unit, and calculating a corresponding target superheat degree of the indoor unit according to the current temperature difference and the initial superheat degree; the current temperature difference is the difference value between the return air temperature of the current indoor unit and a preset reference temperature;
determining the current superheat degree according to the obtained difference value between the outlet temperature of the heat exchanger and the inlet temperature of the heat exchanger in the indoor unit in the starting state at present; wherein, the indoor unit corresponds to the heat exchanger;
when the difference value between the current superheat degree and the target superheat degree is larger than a preset first reference value, increasing the opening degree of the electronic expansion valve;
when the difference value between the current superheat degree and the target superheat degree is smaller than a preset second reference value, reducing the opening degree of the electronic expansion valve;
and when the difference value between the current superheat degree and the target superheat degree is smaller than or equal to the first reference value and larger than or equal to the second reference value, keeping the opening degree of the electronic expansion valve unchanged.
2. The control method of an opening degree of an expansion valve for an air conditioner according to claim 1, wherein when the difference between the current superheat degree and the target superheat degree is greater than a preset first reference value, the opening degree of the electronic expansion valve is increased by 50-100 °;
when the difference value between the current superheat degree and the target superheat degree is smaller than a preset second reference value, reducing the opening degree of the electronic expansion valve by 50-100 degrees;
and when the difference value between the current superheat degree and the target superheat degree is smaller than or equal to the first reference value and larger than or equal to the second reference value, keeping the opening degree of the electronic expansion valve unchanged and maintaining the opening degree for 2 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010562584.7A CN111649461A (en) | 2020-06-18 | 2020-06-18 | Control method for opening degree of expansion valve of air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010562584.7A CN111649461A (en) | 2020-06-18 | 2020-06-18 | Control method for opening degree of expansion valve of air conditioner |
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| CN202010562584.7A Pending CN111649461A (en) | 2020-06-18 | 2020-06-18 | Control method for opening degree of expansion valve of air conditioner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113834202A (en) * | 2021-09-06 | 2021-12-24 | 美的集团武汉暖通设备有限公司 | Air conditioner control method, air conditioner and storage medium |
| WO2022227267A1 (en) * | 2021-04-30 | 2022-11-03 | 芜湖美智空调设备有限公司 | Control method and apparatus for multi-unit tube air conditioner, and air conditioner and storage medium |
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| JP2005016782A (en) * | 2003-06-24 | 2005-01-20 | Matsushita Electric Ind Co Ltd | Method for controlling expansion valve for multi-room type air conditioner |
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| CN109798627A (en) * | 2019-01-15 | 2019-05-24 | 广东美的暖通设备有限公司 | The control method and device of multi-line system |
| CN110579046A (en) * | 2019-09-27 | 2019-12-17 | 海信（山东）空调有限公司 | Control method and device for electronic expansion valve in multi-split refrigeration operation |
| CN111023433A (en) * | 2019-12-31 | 2020-04-17 | 宁波奥克斯电气股份有限公司 | Multi-split refrigerant-lack control method and device, storage medium and air conditioning system |
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2020
- 2020-06-18 CN CN202010562584.7A patent/CN111649461A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005016782A (en) * | 2003-06-24 | 2005-01-20 | Matsushita Electric Ind Co Ltd | Method for controlling expansion valve for multi-room type air conditioner |
| CN109373501A (en) * | 2018-10-24 | 2019-02-22 | 宁波奥克斯电气股份有限公司 | A kind of control method of electric expansion valve, device and multi-line system |
| CN109798627A (en) * | 2019-01-15 | 2019-05-24 | 广东美的暖通设备有限公司 | The control method and device of multi-line system |
| CN110579046A (en) * | 2019-09-27 | 2019-12-17 | 海信（山东）空调有限公司 | Control method and device for electronic expansion valve in multi-split refrigeration operation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022227267A1 (en) * | 2021-04-30 | 2022-11-03 | 芜湖美智空调设备有限公司 | Control method and apparatus for multi-unit tube air conditioner, and air conditioner and storage medium |
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Application publication date: 20200911 |