CN111023272A - Control method and device of multi-split air conditioning system and multi-split air conditioning system - Google Patents

Control method and device of multi-split air conditioning system and multi-split air conditioning system Download PDF

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Publication number
CN111023272A
CN111023272A CN201911422958.9A CN201911422958A CN111023272A CN 111023272 A CN111023272 A CN 111023272A CN 201911422958 A CN201911422958 A CN 201911422958A CN 111023272 A CN111023272 A CN 111023272A
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CN
China
Prior art keywords
indoor unit
electronic expansion
split air
expansion valve
target
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201911422958.9A
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Chinese (zh)
Inventor
章秋平
刘永超
鲍洋
黄春
刘合心
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Filing date
Publication date
Application filed by Ningbo Aux Electric Co Ltd filed Critical Ningbo Aux Electric Co Ltd
Priority to CN201911422958.9A priority Critical patent/CN111023272A/en
Publication of CN111023272A publication Critical patent/CN111023272A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32Responding to malfunctions or emergencies
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/64Electronic processing using pre-stored data
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/62Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63Electronic processing
    • F24F11/65Electronic processing for selecting an operating mode
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/70Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83Control 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
    • F24F11/84Control 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/88Electrical aspects, e.g. circuits
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00Compressor arrangements
    • F25B31/002Lubrication
    • F25B31/004Lubrication oil recirculating arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/16Lubrication

Abstract

The invention provides a control method of a multi-split air conditioning system, wherein the multi-split air conditioning system comprises a plurality of indoor units, each indoor unit is provided with a first electronic expansion valve, and the control method comprises the following steps: in response to a first indoor unit of the plurality of indoor units meeting a warm shutdown condition, closing a first electronic expansion valve of the first indoor unit; and if the multi-split air-conditioning system meets a first target condition, adjusting parameters of a second indoor unit in the indoor units, wherein the second indoor unit comprises the indoor units in the running state, and the first target condition is used for indicating that the quantity of circulating refrigerants of the multi-split air-conditioning system is lower than a target quantity. The invention can close the electronic expansion valve of the indoor unit after the indoor unit is shut down to avoid noise; meanwhile, the condition that the quantity of circulating refrigerants is insufficient due to the closing of the electronic expansion valve can be avoided by adjusting the parameters of the indoor unit in the running state, so that the normal running of the multi-split air-conditioning system is ensured.

Description

Control method and device of multi-split air conditioning system and multi-split air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method and device of a multi-split air conditioning system and the multi-split air conditioning system.
Background
With the continuous development of air conditioning technology, the use of air conditioners is becoming more popular. With the popularization of air conditioners, in order to reduce the number of machines in a scene requiring a plurality of air conditioners, a multi-split air conditioning system in which a plurality of indoor units can be driven by one outdoor unit has come into force. When the multi-split air conditioning system is in the multi-split operation mode, the indoor unit enters a shutdown mode when the indoor unit reaches the temperature. In order to ensure that the indoor unit can quickly recover to work when exiting the shutdown mode, the electronic expansion valve of the indoor unit which is shut down to the warm temperature is not closed generally, but is kept at a certain opening degree. However, if the electronic expansion valve of the indoor unit which is in the warm stop state has a certain opening, the indoor unit in the stop mode may generate noise due to the influence of the system pressure difference, the circulating refrigerant and the opening of the electronic expansion valve, which undoubtedly affects the user experience.
Disclosure of Invention
The invention solves the technical problem that the indoor unit of the multi-split air-conditioning system in the prior art can generate noise when reaching the temperature halt, thereby providing a control method of the multi-split air-conditioning, which can ensure that the quantity of circulating refrigerants is sufficient while closing an electronic expansion valve of the indoor unit reaching the temperature halt, and overcoming the defects in the prior art.
In order to solve the problems, the invention provides a control method of a multi-split air conditioning system, wherein the multi-split air conditioning system comprises a plurality of indoor units, and each indoor unit is provided with a first electronic expansion valve; the control method comprises the following steps: in response to a first indoor unit of the plurality of indoor units meeting a warm shutdown condition, closing a first electronic expansion valve of the first indoor unit; and if the multi-split air conditioning system meets the first target condition, adjusting parameters of a second indoor unit in the indoor units. Wherein the second indoor unit includes an indoor unit in an operating state, and the first target condition is used to indicate that an amount of refrigerant circulating of the multi-split air conditioning system is lower than a target amount.
Further, the adjusting parameters of a second indoor unit of the plurality of indoor units includes: if the multi-split air-conditioning system meets the first target condition, reducing the target supercooling degree of the second indoor unit by a first preset value at intervals of a first preset time period until the multi-split air-conditioning system does not meet the first target condition, or until the target supercooling degree of the second indoor unit reaches a supercooling degree lower limit value: and/or if the target supercooling degree of the second indoor unit reaches the supercooling degree lower limit value and the multi-split air-conditioning system meets the first target condition, increasing the opening degree of the first electronic expansion valve of the second indoor unit by a second preset value every second preset time interval until the multi-split air-conditioning system does not meet the first target condition or until the opening degree of the first electronic expansion valve of the second indoor unit reaches the first opening degree upper limit value.
Further, the method for controlling the multi-split air conditioning system further includes, after adjusting parameters of a second indoor unit of the plurality of indoor units: and if the multi-split air conditioning system meets the second target condition, adjusting the opening degree of a first electronic expansion valve of the first indoor unit. Wherein the second target condition comprises a partial condition of the first target condition.
Further, the adjusting the opening degree of the first electronic expansion valve of the first indoor unit includes: and increasing the opening degree of the first electronic expansion valve of the first indoor unit by a third preset value every a third preset time interval until the multi-split air-conditioning system does not meet a second target condition or until the opening degree of the first electronic expansion valve of the first indoor unit reaches a second opening degree upper limit value. And the upper limit value of the second opening degree is smaller than the opening degree of the first electronic expansion valve of the first indoor unit when the temperature-reaching shutdown condition is met.
Further, the multi-split air conditioning system further comprises an outdoor unit, wherein the outdoor unit is provided with a compressor and a second electronic expansion valve; the first target condition includes at least two of: the temperature of the compressor discharge air is greater than the target temperature value; the opening degree of the second electronic expansion valve is greater than a second target opening degree; and/or the opening degree of the first electronic expansion valve included in the second indoor unit reaches the opening degree lower limit value.
Further, the multi-split air conditioning system further comprises a pressure sensor, wherein the pressure sensor is arranged at the compressor and used for detecting the air pressure value exhausted by the compressor; the target temperature value is the sum of the saturation temperature value corresponding to the air pressure value and the preset temperature value.
Further, the control method of the multi-split air conditioning system further includes: determining the closing time of a first electronic expansion valve of a first indoor unit; if the closing time is longer than the target time, controlling the multi-split air-conditioning system to execute oil return operation; and adjusting the off-time period to zero.
Further, the first indoor unit includes a plurality of indoor units, and determining a closing time period of a first electronic expansion valve of the first indoor unit includes: determining the closing time of the first electronic expansion valves of the first indoor units to obtain a plurality of sub-closing time; and determining the sum of the plurality of sub-off durations as the off duration.
The present invention also provides a control device for a multi-split air conditioning system, the multi-split air conditioning system including a plurality of indoor units, each of the indoor units being provided with a first electronic expansion valve, the control device including: the control module is used for responding to that a first indoor unit in the plurality of indoor units meets a temperature stop condition, and closing a first electronic expansion valve of the first indoor unit; and the parameter adjusting module is used for adjusting the parameter of a second indoor unit in the indoor units if the multi-split air conditioning system meets the first target condition. Wherein the second indoor unit includes an indoor unit in an operating state, and the first target condition is used to indicate that an amount of refrigerant circulating of the multi-split air conditioning system is lower than a target amount.
The present invention also provides a multi-split air conditioning system, including: a plurality of indoor units, each provided with a first electronic expansion valve; and a controller for performing the control method of the multi-split air conditioning system.
According to the invention, when the indoor unit is stopped at the temperature, the first electronic expansion valve of the indoor unit which is stopped at the temperature is closed, so that the noise condition when the indoor unit is in a shutdown state can be avoided. Meanwhile, when the amount of the circulating refrigerant of the multi-split air-conditioning system is lower than the target amount, the circulating refrigerant is improved by adjusting the parameters of the running indoor unit, and the condition that the air-conditioning system cannot run normally due to the fact that the stopped indoor unit retains the refrigerant is avoided.
Drawings
Fig. 1 is a diagram schematically illustrating a control method and a control apparatus of a multi-split air conditioning system and an application scenario of the multi-split air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart schematically illustrating a control method of a multi-split air conditioning system according to a first exemplary embodiment of the present invention;
fig. 3 is a flowchart schematically illustrating a control method of a multi-split air conditioning system according to a second exemplary embodiment of the present invention;
fig. 4 is a flowchart schematically illustrating a control method of a multi-split air conditioning system according to a third exemplary embodiment of the present invention;
fig. 5 is a flowchart schematically illustrating a control method of a multi-split air conditioning system according to a fourth exemplary embodiment of the present invention;
fig. 6 is a block diagram schematically illustrating a configuration of a control apparatus of a multi-split air conditioning system according to an embodiment of the present invention; and
fig. 7 schematically illustrates a block diagram of a multi-split air conditioning system according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The invention provides a control method of a multi-split air conditioning system, which comprises a plurality of indoor units, wherein each indoor unit is provided with a first electronic expansion valve. The control method comprises the following steps: in response to a first indoor unit of the plurality of indoor units meeting a warm shutdown condition, closing a first electronic expansion valve of the first indoor unit; and if the multi-split air conditioning system meets the first target condition, adjusting parameters of a second indoor unit in the indoor units. Wherein the second indoor unit includes an indoor unit in an operating state, and the first target condition is used to indicate that an amount of refrigerant circulating of the multi-split air conditioning system is lower than a target amount.
Fig. 1 is a diagram schematically illustrating a control method and a control apparatus of a multi-split air conditioning system and an application scenario of the multi-split air conditioning system according to an embodiment of the present invention.
As shown in fig. 1, the application scenario 100 includes a multi-split air conditioning system, which includes an outdoor unit 110 and a plurality of indoor units 121, 122, and 123. The outdoor unit and each of the plurality of indoor units are connected by a liquid pipe, a gas pipe, and the like.
Wherein, when heating or cooling operation is carried out, each indoor unit is independently controlled. Each indoor unit and each outdoor unit are provided with independent pipeline connections so that the refrigerant can circularly flow in the pipelines; an electronic expansion valve is arranged on the pipeline to restrict the flow speed of the refrigerant. If an indoor unit is shut down or stops working due to temperature, an electronic expansion valve between the indoor unit and the outdoor unit needs to be closed, and the circulation flow of the refrigerant in the indoor unit is cut off.
Specifically, each indoor unit includes a first electronic expansion valve, and the flow rate of refrigerant passing through each indoor unit is controlled by the opening degree of the first electronic expansion valve. The outdoor unit includes a compressor and a second electronic expansion valve controlling a flow rate of refrigerant in the outdoor unit. The controller may be configured to control operating states of the indoor unit and the outdoor unit, and to control opening degrees of the first electronic expansion valve and the second electronic expansion valve.
It should be noted that the control method of the multi-split air conditioning system according to the embodiment of the present invention may be executed by the multi-split air conditioning system, and accordingly, the control device of the multi-split air conditioning system may be disposed in the multi-split air conditioning system. It should be understood that the structures of the outdoor unit 110 and the indoor units 121, 122, and 123 in fig. 1 are only examples to facilitate understanding of the present invention, and the present invention is not limited thereto.
A control method of a multi-split air conditioning system according to an embodiment of the present invention will be described in detail with reference to fig. 2 to 5.
Fig. 2 schematically illustrates a flowchart of a control method of a multi-split air conditioning system according to a first exemplary embodiment of the present invention.
As shown in fig. 2, the control method of this embodiment may include operations S210 to S220, in which the multi-split air conditioning system includes a plurality of indoor units each provided with a first electronic expansion valve, similar to the multi-split air conditioning system described in fig. 1.
In operation S210, in response to a first indoor unit of the plurality of indoor units satisfying a warm stop condition, a first electronic expansion valve of the first indoor unit is closed.
According to an embodiment of the present invention, the operation S210 may include: the method comprises the steps of collecting environmental temperature information of a space range where each indoor unit is located, and determining whether the temperature in the space range is smaller than the sum of a preset temperature (which can be set by a user) and a temperature compensation value. If the temperature is not less than the sum of the preset temperature and the temperature compensation value, the indoor unit located in the space range is the first indoor unit, namely the first indoor unit meets the temperature-reaching shutdown condition, and the first electronic expansion valve of the first indoor unit is closed, so that the opening degree of the first electronic expansion valve of the first indoor unit is zero.
In operation S220, if the multi-split air conditioning system satisfies the first target condition, a parameter of a second indoor unit of the plurality of indoor units is adjusted.
According to an embodiment of the present invention, it is considered that the first electronic expansion valve of the first indoor unit is closed, which may cause a decrease in the circulating coolant of the multi-split air conditioning system. Therefore, in order to prevent the indoor unit of the multi-split air conditioning system that is not warm-stopped due to insufficient amount of the circulating coolant from being normally operated, operation S220 may determine whether the amount of the circulating coolant of the multi-split air conditioning system reaches a target amount (which may be, for example, a minimum amount of the circulating coolant that ensures normal operation of the multi-split air conditioning system) and, if not, adjust the amount of the circulating coolant by adjusting parameters of the indoor unit in an operating state. Accordingly, the first target condition in operation S220 is to indicate that the amount of refrigerant circulated by the multi-split air conditioning system is lower than the target amount. The second indoor unit means an indoor unit in an operating state.
According to an embodiment of the present disclosure, the multi-split air conditioning system further includes an outdoor unit provided with a compressor and a second electronic expansion valve. It is considered that if the amount of the coolant flowing through decreases, the temperature of the discharge gas of the compressor increases. Therefore, the higher the temperature of the compressor discharge air, the smaller the amount of the coolant flowing therethrough can be described. It is considered that the second electronic expansion valve of the outdoor unit may increase the opening degree to increase the amount of the refrigerant to be circulated if the amount of the refrigerant to be circulated is insufficient. Therefore, the larger the opening degree of the second electronic expansion valve of the outdoor unit is, the smaller the amount of the refrigerant flowing therethrough is. Considering that the pressure of the system is increased if the amount of the circulating coolant is insufficient, the normally operating indoor unit generally decreases the opening degree of the first electronic expansion valve in order to allow the normally operating second indoor unit to reach the target supercooling degree, and thus, the smaller the opening degree of the second electronic expansion valve of the normally operating second indoor unit, the smaller the amount of the circulating coolant is. Among these, considering the three results that the aforementioned small amount of circulating coolant causes, each result is likely to be generated due to other factors. Therefore, in order to more accurately reflect the shortage of the amount of the circulating coolant, the first target condition may include, for example, at least two of: the temperature of the compressor discharge air is greater than the target temperature value; the opening degree of the second electronic expansion valve is greater than a second target opening degree; and/or the opening degree of the first electronic expansion valve included in the second indoor unit reaches the opening degree lower limit value. Further, the first target condition may include, for example, the above-described three conditions to improve the accuracy of determining that the amount of circulating coolant is insufficient.
According to an embodiment of the present invention, the target temperature value may be, for example, the sum of the saturation temperature Tpa corresponding to the pressure value at which the refrigerant is in a state and a temperature value at which it is determined that the compressor discharge air is excessively high. The temperature value for determining that the compressor discharge air is too high may be, for example, a predetermined temperature value, and the predetermined temperature value may be set according to a demand. In order to determine Tpa, the multi-split air conditioning system further includes a pressure sensor for detecting a pressure value of the refrigerant in a state, where Tpa is a saturation temperature corresponding to the detected pressure value. Wherein, determining the saturation temperature according to the pressure value may be, for example: and searching a comparison table of the pressure and the temperature of the refrigerant (refrigerant) according to the pressure value, and determining that the temperature corresponding to the pressure value is the saturation temperature.
According to the embodiment of the present invention, it can be seen from the comparison table of the refrigerant (refrigerant) pressure and the temperature that the saturation temperature is higher as the refrigerant pressure is higher. Considering that the target supercooling degree is large, the opening degree of the electronic expansion valve is made small, and the amount of the refrigerant flowing therethrough is made small. Therefore, when the multi-split air conditioning system satisfies the first target condition, the target supercooling degree may be appropriately decreased in order to increase the amount of refrigerant circulating. Accordingly, the parameter of the second indoor unit adjusted in operation S220 may be, for example, a target supercooling degree. The adjustment process may include, for example: and reducing the target supercooling degree of the second indoor unit by a first preset value every interval of a first preset time period until the multi-split air-conditioning system does not meet the first target condition or until the target supercooling degree of the second indoor unit reaches a supercooling degree lower limit value. In order to ensure that the second indoor unit has higher working efficiency, the target supercooling degree is ensured to be not lower than the lower limit value during adjustment. The lower limit may be, for example, a value not less than 5 ℃, the first predetermined time may be, for example, 5s, and the first predetermined value may be, for example, 1 ℃. It is to be understood that the values of the lower limit value, the first predetermined time period and the first predetermined value are only taken as examples to facilitate understanding of the present invention, and the present invention is not limited thereto.
According to the embodiment of the present invention, it is considered that the smaller the opening degree of the first electronic expansion valve, the smaller the amount of the coolant flowing therethrough, and therefore, if the opening degree of the first electronic expansion valve of the second indoor unit in the operation state is forcibly increased, the amount of the coolant flowing therethrough may be increased. Accordingly, the parameter of the second indoor unit adjusted in the aforementioned operation S220 may be, for example, an opening degree of a first electronic expansion valve included in the second indoor unit. Therefore, the adjusting of the parameter of the second indoor unit in operation S220 may be implemented by: and increasing the opening degree of the first electronic expansion valve of the second indoor unit by a second preset value every second preset time interval until the multi-split air-conditioning system does not meet the first target condition or until the opening degree of the first electronic expansion valve of the second indoor unit reaches the upper limit value of the first opening degree. Considering that the air outlet area of the indoor unit is fixed, when the opening degree of the first electronic expansion valve is increased, if the opening degree is too large, part of the coolant is not completely evaporated, and unnecessary coolant flows. Therefore, the first opening degree upper limit value may be set for the opening degree of the first electronic expansion valve of the second indoor unit. The second predetermined period of time may be, for example, the same as the first predetermined period of time, the second predetermined value may be, for example, 10pls, and the first opening degree upper limit value may be, for example, 480 pls. It is to be understood that the values of the second predetermined period of time, the second predetermined value, and the first opening degree upper limit value are only examples to facilitate understanding of the present invention, and the present invention is not limited to this, and the second predetermined period of time, the second predetermined value, and the first opening degree upper limit value may be set according to actual requirements.
According to an embodiment of the present invention, the multi-split air conditioning system may automatically adjust the opening degree of the first electronic expansion valve according to a target supercooling degree while considering the adjustment of the target supercooling degree to improve the amount of the circulated refrigerant. Therefore, the operation S220 may, for example, first reduce the target supercooling degree of the second indoor unit by the first predetermined value at intervals of the first predetermined period. If the target supercooling degree of the second indoor unit reaches the lower supercooling degree limit value and the multi-split air conditioning system still meets the first target condition, the opening degree of the first electronic expansion valve of the second indoor unit is forcibly increased, namely the opening degree of the first electronic expansion valve of the second indoor unit is increased by a second preset value every second preset time interval.
According to the embodiment of the present invention, if the multi-split air conditioning system does not satisfy the first target condition any more but still satisfies some of the first target conditions through operation S220, it is described that the amount of refrigerant circulating is insufficient although the amount of refrigerant is improved. This may be due to more refrigerant remaining in the first indoor unit to the warm stop. Therefore, in order to further increase the amount of refrigerant flowing, the opening degree of the first electronic expansion valve of the first indoor unit may be adjusted after operation S220.
Fig. 3 schematically illustrates a flowchart of a control method of a multi-split air conditioning system according to a second exemplary embodiment of the present invention.
As shown in fig. 3, the control method of the multi-split air conditioning system of the embodiment may further include operation S330, in addition to operation S210 to operation S220, the operation S330 being performed after operation S220.
In operation S330, if the multi-split air conditioning system satisfies a second target condition, an opening degree of a first electronic expansion valve of the first indoor unit is adjusted. Wherein the second target condition comprises a partial condition of the first target condition.
According to an embodiment of the present invention, the first target condition may include, for example, the following three conditions: condition 1, the temperature of the compressor exhaust is greater than a target temperature value; the condition 2 that the opening degree of the second electronic expansion valve is larger than a second target opening degree; and in condition 3, the opening degree of the first electronic expansion valve included in the second indoor unit reaches the opening degree lower limit value. Wherein it is considered that the opening degree of the first electronic expansion valve of the second indoor unit has reached the second opening degree upper limit value through operation S220. Therefore, the aforementioned condition 3 must not be satisfied after operation S220. Thus, the second target condition may for example comprise: the temperature of the exhaust gas of the compressor is greater than the target temperature value, and the opening degree of the second electronic expansion valve is greater than the second target opening degree.
According to an embodiment of the present invention, in order to avoid a large noise as much as possible, the opening degree of the first electronic expansion valve of the first indoor unit may be increased stepwise. Thus, operation S330 may include, for example: and increasing the opening degree of the first electronic expansion valve of the first indoor unit by a third preset value every a third preset time interval until the multi-split air-conditioning system does not meet a second target condition or until the opening degree of the first electronic expansion valve of the first indoor unit reaches a second opening degree upper limit value. In order to simultaneously achieve the effect of noise avoidance, the opening degree of the first electronic expansion valve of the first indoor unit should be smaller than the opening degree at the time of shutdown at the warm temperature, and therefore, a second opening degree upper limit value is set for the opening degree of the first electronic expansion valve of the first indoor unit. The second opening degree upper limit value is smaller than the opening degree of a first electronic expansion valve of the first indoor unit when the temperature stop condition is met.
According to the embodiment of the invention, if the first electronic expansion valve is closed after the first indoor unit stops working at a warm state, oil may accumulate inside the first indoor unit. It may cause oil shortage of the compressor in the outdoor unit after a long time and thus reduce the life span of the compressor. In order to solve this problem, this embodiment may perform an oil return process on the multi-split air conditioning system, for example, periodically.
Fig. 4 schematically illustrates a flowchart of a control method of a multi-split air conditioning system according to a third exemplary embodiment of the present invention.
As shown in fig. 4, the control method of the multi-split air conditioning system of the embodiment may further include, for example, operations S440 to S460 in addition to operations S210 to S220. The operations S440 to S460 may be performed after the operation S220.
In operation S440, a closing period of a first electronic expansion valve of a first indoor unit is determined.
According to an embodiment of the present invention, in order to facilitate determination of the closing time period of the first electronic expansion valve, the embodiment may record, for example, the closing timing of the first electronic expansion valve when the first electronic expansion valve is closed through operation S210. And then calculating the closing time of the first electronic expansion valve according to the recorded closing time and the current time.
According to an embodiment of the present invention, when there are a plurality of first indoor units to warm stop, the closing period in operation S440 may be, for example, a total closing period of a plurality of first electronic expansion valves of the plurality of first indoor units. Thus operation S440 may, for example, comprise: the closing time length of the first electronic expansion valve of each of the first indoor units is determined firstly, and a plurality of sub-closing time lengths are obtained. The sum of the plurality of sub-closing periods is then determined as the closing period of the first electronic expansion valve.
In operation S450, if the off-duration is greater than the target duration, the multi-split air conditioning system is controlled to perform an oil return operation.
It is considered that a part of the lubricant oil is carried when the outdoor unit discharges. Therefore, when the closing time is long, the compressor may have oil shortage, and the oil return operation is performed. The target time period may be, for example, four hours, six hours, eight hours, or the like. The target duration may be set according to actual requirements, which is not limited in the present invention. The multi-split air conditioning system may further include a gas-liquid separator, for example, and part of the lubricating oil may flow along with the refrigerant during the flow of the refrigerant. In the process of flowing the refrigerant from the indoor unit to the gas-liquid separator, the refrigerant flows at a low speed in the pipe, and the lubricating oil flow resistance is large, so that a large amount of lubricating oil is accumulated in the pipe at this stage. Accordingly, the oil return operation may include, for example: in the gas-liquid separator, the lubricating oil and the refrigerant are controlled to enter the suction pipe from an oil return hole on the suction pipe of the gas-liquid separator so as to flow back to the compressor.
After the oil return operation is performed, in order to facilitate determining the timing of the next oil return operation, operation S460 is performed to adjust the closing duration to zero, so as to accumulate the closing duration again, until the accumulated closing duration is greater than the target duration, and the oil return operation is performed again.
In summary, in the embodiment of the present invention, by performing the oil return operation when the closing time of the first electronic expansion valve is long, the oil shortage of the compressor can be avoided, and therefore, the service life of the compressor can be prolonged.
Fig. 5 schematically illustrates a flowchart of a control method of a multi-split air conditioning system according to a fourth exemplary embodiment of the present invention.
As shown in fig. 5, the control method of the multi-split air conditioning system of the embodiment may include operations S501 to S513.
In operation S501, when some indoor units (first indoor units) among the plurality of indoor units are switched from the heating mode to the shutdown mode due to the warm-up shutdown, the warm-up indoor units are respectively labeled as B1, B2, and B3 …, and the electronic expansion valves of the warm-up indoor units are closed.
In operation S502, it is determined whether the multi-split air conditioning system satisfies conditions 1, 2, and 3, where the conditions 1, 2, and 3 are the aforementioned conditions 1, 2, and 3, and are not described herein again. When the conditions 1 to 3 are satisfied, operation S503 is performed. When any one of the conditions 1 to 3 is not satisfied, operation S504 is performed.
In operation S503, for an indoor unit (a second outdoor unit) in the normal heating mode among the plurality of indoor units, the target supercooling degree of the indoor unit in the normal heating mode is decreased by 1 ℃ at intervals of time ta until the target supercooling degree reaches the supercooling degree lower limit value. In performing the operation S503, the operation S505 may be performed once after a fourth predetermined period (e.g., 10S) of time after each adjustment of the target supercooling degree.
In operation S504, the current target supercooling degree of the indoor unit in the normal heating mode is maintained, so that the multi-split air conditioning system automatically adjusts the opening degree of the electronic expansion valve of the indoor unit in the normal heating mode.
In operation S505, it is determined whether the multi-split air conditioning system satisfies conditions 1, 2, and 3. When the conditions 1, 2, and 3 are still satisfied and the target supercooling degree of the indoor unit in the normal heating mode reaches the supercooling degree lower limit value, operation S506 is performed. If any of the conditions 1 to 3 is not satisfied, operation S507 is performed.
In operation S506, the opening degree of the electronic expansion valve of the indoor unit in the normal heating mode is forcibly controlled such that the opening degree of the electronic expansion valve of the indoor unit in the normal heating mode gradually reaches a set maximum opening degree (a first opening degree upper limit value). After a fifth predetermined period of time (e.g., 10S) after each adjustment of the opening degree of the electronic expansion valve, operation S508 is performed.
In operation S507, the current opening degree of the electronic expansion valve of the indoor unit in the normal heating mode is maintained.
In operation S508, it is determined whether the multi-split air conditioning system satisfies the conditions 1 and 2, and if the conditions 1 and 2 are still satisfied but the opening degree of the electronic expansion valve of the indoor unit in the normal heating mode does not reach the set maximum opening degree, operation S506 is continuously performed. If the conditions 1 and 2 are still satisfied and the opening degree of the electronic expansion valve of the indoor unit in the normal heating mode reaches the set maximum opening degree, operation S509 is performed. If the conditions 1 and 2 are not satisfied, operation S507 is performed.
In operation S509, the opening degree of the electronic expansion valve of the indoor unit that has been brought to the warm-stop is gradually increased until the opening degree of the electronic expansion valve of the indoor unit that has been brought to the warm-stop gradually reaches a set upper limit value (second opening degree upper limit value), or either one of the conditions 1 and 2 is not satisfied.
In order to ensure that the lubricating oil of the compressor is enough, the oil return operation is also performed periodically. Therefore, as shown in fig. 5, after operation S501, the control method of this embodiment further includes operations S510 to S513.
In operation S510, closing time periods t1, t2, and t3 … of the electronic expansion valve of the indoor unit in the warm stop are recorded, and a total closing time period t is calculated as t1+ t2+ t3+. Operation S510 is similar to operation S440 in fig. 4, and is not described herein again.
In operation S511, it is determined whether the total off-period t is less than t0 (target period). If t is less than t0, the process returns to continue operation S510, and if t is not less than t0, operation S512 is performed.
In operation S512, the multi-split air conditioning system is controlled to enter an oil return procedure, and operation S512 is similar to operation S450 in fig. 4 and will not be described again. After entering the oil return procedure, operation S513 is performed.
In operation S513, the time durations t1, t2, t3 … are cleared, and the execution returns to operation S510 to accumulate t1, t2, t3 … again.
In summary, in the control method of the multi-split air conditioning system according to the embodiment, the electronic expansion valve is closed when the multi-split air conditioning system is stopped at the temperature, so that noise generated by the indoor unit which is stopped at the temperature can be avoided. Meanwhile, the condition that the amount of circulating refrigerant is insufficient can be avoided by adjusting the target supercooling degree of the indoor unit in the normal heating mode and the opening degree of the electronic expansion valve, so that the normal operation of the multi-split air-conditioning system is ensured. Moreover, by recording the closing time of the electronic expansion valve, oil return can be performed on the multi-split air conditioning system periodically, so that the condition of oil shortage of the compressor caused by closing the electronic expansion valve of the indoor unit during warm shutdown can be avoided, and the service life of the compressor is prolonged.
Fig. 6 schematically illustrates a block diagram of a control apparatus of a multi-split air conditioning system according to an embodiment of the present invention.
As shown in fig. 6, the embodiment provides a control apparatus 600 of a multi-split air conditioning system based on the aforementioned control method of the multi-split air conditioning system. The control apparatus 600 may include, for example, a control module 610 and a parameter adjustment module 620.
The control module 610 is configured to close a first electronic expansion valve of a first indoor unit of the plurality of indoor units in response to the first indoor unit satisfying a warm stop condition (operation S210).
The parameter adjusting module 620 is configured to adjust a parameter of a second indoor unit of the plurality of indoor units if the multi-split air conditioning system meets the first target condition (operation S220). Wherein the second indoor unit includes an indoor unit in an operating state, and the first target condition is used to indicate that an amount of refrigerant circulating of the online air conditioning system is lower than a target amount.
According to an embodiment of the present invention, the control device 600 is further configured to execute the control method in the foregoing embodiments, which is not described herein again.
Fig. 7 schematically illustrates a block diagram of a multi-split air conditioning system according to an exemplary embodiment of the present invention.
As shown in fig. 7, the embodiment provides a multi-split air conditioning system 700 based on the aforementioned control method of the multi-split air conditioning system. The multi-split control system 700 includes a plurality of indoor units 710 and a controller 720. A first electronic expansion valve is disposed in each of the plurality of indoor units. The controller 720 is configured to perform a control method of the multi-split air conditioning system described in the foregoing embodiments.
Although the present invention has been disclosed above, the scope of the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A control method of a multi-split air conditioning system comprises a plurality of indoor units, wherein each indoor unit is provided with a first electronic expansion valve; the method comprises the following steps:
in response to a first indoor unit of the plurality of indoor units meeting a warm shutdown condition, closing a first electronic expansion valve of the first indoor unit; and
if the multi-split air conditioning system meets the first target condition, adjusting the parameters of a second indoor unit in the indoor units,
the second indoor unit comprises an indoor unit in an operating state, and the first target condition is used for indicating that the circulating refrigerant quantity of the multi-split air-conditioning system is lower than a target quantity.
2. The method of claim 1, wherein said adjusting a parameter of a second indoor unit of the plurality of indoor units comprises:
if the multi-split air-conditioning system meets the first target condition, reducing the target supercooling degree of the second indoor unit by a first preset value at intervals of a first preset time period until the multi-split air-conditioning system does not meet the first target condition, or until the target supercooling degree of the second indoor unit reaches a supercooling degree lower limit value: and/or
And if the target supercooling degree of the second indoor unit reaches the supercooling degree lower limit value and the multi-split air-conditioning system meets the first target condition, increasing the opening degree of the first electronic expansion valve of the second indoor unit by a second preset value every second preset time interval until the multi-split air-conditioning system does not meet the first target condition or until the opening degree of the first electronic expansion valve of the second indoor unit reaches the first opening degree upper limit value.
3. The method of claim 2, further comprising, after adjusting the parameter of the second indoor unit of the plurality of indoor units:
if the multi-split air conditioning system meets a second target condition, the opening degree of a first electronic expansion valve of the first indoor unit is adjusted,
wherein the second target condition comprises a partial condition of the first target condition.
4. The method of claim 2, wherein said adjusting an opening degree of a first electronic expansion valve of the first indoor unit comprises:
increasing the opening degree of the first electronic expansion valve of the first indoor unit by a third preset value every a third preset time interval until the multi-split air-conditioning system does not meet the second target condition or until the opening degree of the first electronic expansion valve of the first indoor unit reaches a second opening degree upper limit value,
and the upper limit value of the second opening degree is smaller than the opening degree of a first electronic expansion valve of the first indoor unit when the temperature-reaching shutdown condition is met.
5. The method as claimed in claim 2 or 3, wherein the multi-split air conditioning system further comprises an outdoor unit provided with a compressor and a second electronic expansion valve; the first target condition includes at least two of:
the temperature of the compressor discharge air is greater than a target temperature value;
the opening degree of the second electronic expansion valve is greater than a second target opening degree; and/or
The opening degree of a first electronic expansion valve included in the second indoor unit reaches a lower opening degree limit value.
6. The method as claimed in claim 5, wherein the multi-split air conditioning system further comprises a pressure sensor for detecting a pressure value at which the refrigerant is in a state; the target temperature value is the sum of the saturation temperature value corresponding to the pressure value and a preset temperature value.
7. The method of claim 1, further comprising:
determining the closing time of a first electronic expansion valve of the first indoor unit;
if the closing time is longer than the target time, controlling the multi-split air-conditioning system to execute oil return operation; and
adjusting the turn-off duration to zero.
8. The method of claim 7, wherein the first indoor unit comprises a plurality of, and wherein determining a closing duration of a first electronic expansion valve of the first indoor unit comprises:
determining the closing time of the first electronic expansion valves of the first indoor units to obtain a plurality of sub-closing time; and
determining the sum of the plurality of sub-off durations as the off duration.
9. A control device of a multi-split air conditioning system, the multi-split air conditioning system comprises a plurality of indoor units, each indoor unit is provided with a first electronic expansion valve, and the device comprises:
the control module is used for responding to that a first indoor unit in the indoor units meets a temperature shutdown condition, and closing a first electronic expansion valve of the first indoor unit; and
a parameter adjusting module for adjusting a parameter of a second indoor unit among the plurality of indoor units if the multi-split air conditioning system satisfies a first target condition,
the second indoor unit comprises an indoor unit in an operating state, and the first target condition is used for indicating that the circulating refrigerant quantity of the multi-split air-conditioning system is lower than a target quantity.
10. A multi-split air conditioning system comprising:
a plurality of indoor units, each provided with a first electronic expansion valve; and
a controller for performing the method of controlling the multi-split air conditioning system as set forth in any one of claims 1 to 8.
CN201911422958.9A 2019-12-30 2019-12-30 Control method and device of multi-split air conditioning system and multi-split air conditioning system Pending CN111023272A (en)

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