CN107940827B - Multi-split air conditioning system and refrigerant distribution control method and device thereof - Google Patents

Multi-split air conditioning system and refrigerant distribution control method and device thereof Download PDF

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Publication number
CN107940827B
CN107940827B CN201711107034.0A CN201711107034A CN107940827B CN 107940827 B CN107940827 B CN 107940827B CN 201711107034 A CN201711107034 A CN 201711107034A CN 107940827 B CN107940827 B CN 107940827B
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indoor unit
superheat degree
preset
outdoor
expansion valve
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CN107940827A (en
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王命仁
杨坤
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment 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
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion 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
    • 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
    • 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
    • F25B2600/05—Refrigerant levels
    • 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
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses a multi-split system and a refrigerant distribution control method and device thereof, wherein the method comprises the following steps: when the multi-split system operates in the main heating mode, the actual superheat degree of the refrigerating indoor unit is obtained, the exhaust superheat degree of the compressor is obtained, the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit is controlled according to the actual superheat degree of the refrigerating indoor unit so as to adjust the flow of the refrigerant flowing through the refrigerating indoor unit, and the opening degree of the outdoor electronic expansion valve is controlled according to the relation between the exhaust superheat degree of the compressor and the preset exhaust superheat degree, in the process of adjusting the flow of the refrigerant flowing through the refrigerating indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the refrigerating indoor unit reaches the preset maximum opening degree, and the outdoor unit receives the superheat correction opening signal and continues for a first preset time, by increasing the preset exhaust superheat, so as to reduce the current opening degree of the outdoor electronic expansion valve, thereby ensuring the sufficient capacity of the refrigeration indoor unit.

Description

Multi-split air conditioning system and refrigerant distribution control method and device thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant distribution control method of a multi-split system, a refrigerant distribution control device of the multi-split system and the multi-split system with the control device.
Background
In the traditional heat pump multi-split air conditioning system, when the indoor side generates a refrigeration demand, the system transfers the heat load of the indoor side to the outdoor machine through a refrigerant and releases the heat through condensation of an outdoor heat exchanger; when the indoor side generates the heating demand, the system absorbs heat to the environment by switching the evaporator of the outdoor heat exchanger, and transfers the heat absorbed by the outdoor unit to the indoor side through the refrigerant so as to meet the heating demand of the indoor side. However, in a building air conditioning system using a multi-split air conditioning system, there are often both cooling and heating loads, and for example, in a conference room in the center of a building, since the surrounding is a heating room, the room temperature is high, and when a person suddenly increases, the temperature is easily increased to generate a cooling load. The heat pump multi-split air conditioner system cannot control the outdoor heat exchanger to absorb and release heat simultaneously, and the three-pipe multi-split air conditioner system can effectively transfer the heat load of the refrigerating inner machine to the heating inner machine, so that the output power of the compressor is effectively reduced while the requirements for refrigerating and heating simultaneously are met, and the system is more energy-saving in operation.
However, when the system is operated for cooling and heating, the difference of cooling and heating requirements needs to be accurately judged, and the evaporation and condensation processing capacity of the external heat exchanger needs to be controlled, so that the cold and heat balance of the system can be ensured.
Disclosure of Invention
The present invention is directed to solving at least one of the problems in the art to some extent. Therefore, a first object of the present invention is to provide a refrigerant distribution control method for a multi-split air conditioning system, which can reasonably control the refrigerant distribution at the low-pressure side, and ensure the cold-heat balance of the system, thereby ensuring the sufficient capacity of the refrigeration indoor unit.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
The third objective of the present invention is to provide a refrigerant distribution control device for a multi-split air conditioning system.
A fourth object of the present invention is to provide a multi-split system.
In order to achieve the above object, a refrigerant distribution control method for a multi-split air conditioning system according to an embodiment of the present invention includes an outdoor unit, a plurality of indoor units, and a refrigerant distribution device, where the outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor electronic expansion valve, and a four-way valve, the refrigerant distribution device includes a heating solenoid valve and a cooling solenoid valve, each indoor unit includes an indoor heat exchanger and an indoor electronic expansion valve, and the refrigerant distribution control method includes the following steps: when the multi-split air conditioner system runs in a main heating mode, acquiring the actual superheat degree of a refrigerating indoor unit and acquiring the exhaust superheat degree of a compressor; controlling the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit according to the actual superheat degree of the refrigerating indoor unit so as to adjust the flow of a refrigerant flowing through the refrigerating indoor unit, and controlling the opening degree of an outdoor electronic expansion valve according to the relation between the exhaust superheat degree of the compressor and a preset exhaust superheat degree; in the process of adjusting the flow of the refrigerant flowing through the refrigeration indoor unit, if the opening degree of an indoor electronic expansion valve corresponding to the refrigeration indoor unit reaches a preset maximum opening degree, judging whether the refrigeration indoor unit needs to send a superheat correction opening signal to the outdoor unit; and when the outdoor unit receives the superheat correction opening signal and lasts for a first preset time, the current opening degree of the outdoor electronic expansion valve is reduced by increasing the preset exhaust superheat degree.
According to the refrigerant distribution control method of the multi-split system, when the multi-split system operates in a main heating mode, the actual superheat degree of a refrigerating indoor unit is obtained, the exhaust superheat degree of a compressor is obtained, the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit is controlled according to the actual superheat degree of the refrigerating indoor unit so as to adjust the flow rate of a refrigerant flowing through the refrigerating indoor unit, the opening degree of an outdoor electronic expansion valve is controlled according to the relation between the exhaust superheat degree of the compressor and the preset exhaust superheat degree, and in the process of adjusting the flow rate of the refrigerant flowing through the refrigerating indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the refrigerating indoor unit reaches the preset maximum opening degree, whether the refrigerating indoor unit needs to send a superheat correction opening signal to the outdoor unit is judged; and when the outdoor unit receives the superheat correction opening signal and lasts for a first preset time, the current opening degree of the outdoor electronic expansion valve is reduced by increasing the preset exhaust superheat degree. Therefore, the method can reasonably control the distribution of the refrigerant at the low-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the refrigeration indoor unit.
In addition, the refrigerant distribution control method of the multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, determining whether the refrigeration indoor unit needs to send a superheat correction on signal to the outdoor unit includes: acquiring the return air temperature of the refrigerating indoor unit and the set temperature of the refrigerating indoor unit; if the temperature difference value between the return air temperature of the refrigerating indoor unit and the set temperature is larger than the preset temperature difference and the actual superheat degree of the refrigerating indoor unit is larger than the preset superheat degree, judging that the refrigerating indoor unit needs to send a superheat degree correction opening signal to the outdoor unit; and if the temperature difference between the return air temperature of the refrigeration indoor unit and the set temperature is less than or equal to a preset temperature difference, or the actual superheat degree of the refrigeration indoor unit is less than or equal to a preset superheat degree, judging that the refrigeration indoor unit needs to send a superheat degree correction closing signal to the outdoor unit.
According to an embodiment of the present invention, when the outdoor unit receives the superheat correction closing signal, if the current opening degree of the outdoor electronic expansion valve is a preset minimum opening degree and lasts for a second preset time, the multi-split air-conditioning system is controlled to switch to a main cooling mode.
According to one embodiment of the invention, when the discharge superheat degree of the compressor is greater than or equal to a preset threshold value, the current opening degree of the outdoor electronic expansion valve is adjusted to be larger by reducing the preset discharge superheat degree.
In order to achieve the above object, a non-transitory computer readable storage medium is provided according to a second aspect of the present invention, and a computer program is stored thereon, and when being executed by a processor, the computer program implements the refrigerant distribution control method of the multi-split system.
By executing the refrigerant distribution control method of the multi-split air conditioning system, the non-transitory computer readable storage medium of the embodiment of the invention can reasonably control the low-pressure side refrigerant distribution, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the refrigeration indoor unit.
In order to achieve the above object, a third embodiment of the present invention provides a refrigerant distribution control device for a multi-split air-conditioning system, where the multi-split air-conditioning system includes an outdoor unit, a plurality of indoor units, and a refrigerant distribution device, the outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor electronic expansion valve, and a four-way valve, the refrigerant distribution device includes a heating solenoid valve and a cooling solenoid valve, each indoor unit includes an indoor heat exchanger and an indoor electronic expansion valve, and the refrigerant distribution control device includes: the first superheat degree acquisition module is used for acquiring the actual superheat degree of the refrigerating indoor unit when the multi-split air conditioning system operates in a main heating mode; the second superheat degree acquisition module is used for acquiring the exhaust superheat degree of the compressor when the multi-split system operates in a main heating mode; the first control module is used for controlling the opening degree of an indoor electronic expansion valve corresponding to the refrigeration indoor unit according to the actual superheat degree of the refrigeration indoor unit so as to adjust the flow of a refrigerant flowing through the refrigeration indoor unit; the second control module is used for controlling the opening degree of the outdoor electronic expansion valve according to the relation between the exhaust superheat degree of the compressor and a preset exhaust superheat degree; the judging module is used for judging whether the refrigerating indoor unit needs to send a superheat correction opening signal to the outdoor unit or not if the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit reaches a preset maximum opening degree in the process of regulating the flow of a refrigerant flowing through the refrigerating indoor unit; the second control module is further used for increasing the preset exhaust superheat degree to reduce the current opening degree of the outdoor electronic expansion valve when the outdoor unit receives the superheat degree correction opening signal and lasts for a first preset time.
According to the refrigerant distribution control device of the multi-split system of the embodiment of the invention, when the multi-split system operates in a main heating mode, the actual superheat degree of a refrigerating indoor unit is obtained through a first superheat degree obtaining module, the exhaust superheat degree of a compressor is obtained through a second superheat degree obtaining module, the first control module controls the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit according to the actual superheat degree of the refrigerating indoor unit so as to adjust the flow rate of a refrigerant flowing through the refrigerating indoor unit, the second control module controls the opening degree of an outdoor electronic expansion valve according to the relation between the exhaust superheat degree of the compressor and the preset exhaust superheat degree, and in the process of adjusting the flow rate of the refrigerant flowing through the refrigerating indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the refrigerating indoor unit reaches the preset maximum opening degree, a judging module judges whether the refrigerating indoor unit needs to send a superheat degree correction opening signal to, when the outdoor unit receives the superheat correction opening signal and lasts for a first preset time, the second control module increases the preset exhaust superheat to reduce the current opening degree of the outdoor electronic expansion valve. Therefore, the device can reasonably control the distribution of the refrigerant at the low-pressure side, and ensure the cold and hot balance of the system, thereby ensuring the sufficient capacity of the refrigeration indoor unit.
In addition, the refrigerant distribution control device of the multi-split system according to the above embodiment of the present invention may further have the following additional technical features:
according to an embodiment of the present invention, the refrigerant distribution control device of a multi-split air-conditioning system further includes a temperature obtaining module, wherein when the judging module judges whether the refrigerating indoor unit needs to send a superheat correction start signal to the outdoor unit, the judging module obtains the return air temperature of the refrigerating indoor unit and the set temperature of the refrigerating indoor unit through the temperature obtaining module, and respectively judges a temperature difference between the return air temperature of the refrigerating indoor unit and the set temperature and a superheat of the refrigerating indoor unit, and if the temperature difference between the return air temperature of the refrigerating indoor unit and the set temperature is greater than a preset temperature difference and the actual superheat of the refrigerating indoor unit is greater than a preset superheat, the judging module judges that the refrigerating indoor unit needs to send a superheat correction start signal to the outdoor unit; and if the temperature difference between the return air temperature of the refrigeration indoor unit and the set temperature is less than or equal to a preset temperature difference, or the actual superheat degree of the refrigeration indoor unit is less than or equal to a preset superheat degree, judging that the refrigeration indoor unit needs to send a superheat degree correction closing signal to the outdoor unit.
According to an embodiment of the present invention, the second control module is further configured to, when the outdoor unit receives the superheat correction closing signal, control the multi-split air conditioning system to switch to the main cooling mode if the current opening degree of the outdoor electronic expansion valve is a preset minimum opening degree and lasts for a second preset time.
According to an embodiment of the invention, the second control module is further used for adjusting the current opening degree of the outdoor electronic expansion valve to be larger by reducing the preset discharge superheat degree when the discharge superheat degree of the compressor is greater than or equal to a preset threshold value.
In order to achieve the above object, a fourth aspect of the present invention provides a multi-split air-conditioning system, which includes the refrigerant distribution control device of the multi-split air-conditioning system.
According to the multi-split system provided by the embodiment of the invention, the refrigerant distribution control device of the multi-split system can reasonably control the refrigerant distribution at the low-pressure side, and the cold and heat balance of the system is ensured, so that the sufficient capacity of the refrigeration indoor unit is ensured.
Drawings
Fig. 1 is a schematic configuration diagram of a multi-split system according to an embodiment of the present invention;
fig. 2 is a flowchart of a refrigerant distribution control method of a multi-split system according to an embodiment of the present invention;
fig. 3 is a block diagram illustrating a refrigerant distribution control apparatus of a multi-split system according to an embodiment of the present invention;
fig. 4 is a block diagram illustrating a refrigerant distribution control apparatus of a multi-split system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A refrigerant distribution control method of a multi-split system, a refrigerant distribution control apparatus of a multi-split system, and a multi-split system having the same according to embodiments of the present invention are described below with reference to the accompanying drawings.
In an embodiment of the present invention, the multi-split system may include an outdoor unit, which may include a compressor, an outdoor heat exchanger, an outdoor electronic expansion valve, and a four-way valve, a plurality of indoor units, each of which may include an indoor heat exchanger and an indoor electronic expansion valve, and a refrigerant distribution device, which may include a heating solenoid valve and a cooling solenoid valve.
Specifically, as shown in fig. 1, a three-pipe multi-split system is taken as an example. The outdoor unit 100 may include a compressor 110, a first outdoor heat exchanger 120, a second outdoor heat exchanger 130, an outdoor electronic expansion valve EVX1 correspondingly connected to the first outdoor heat exchanger 120, an outdoor electronic expansion valve EVX2 correspondingly connected to the second outdoor heat exchanger 130, four-way valves ST1, ST2, and ST 3. The refrigerant distribution device 300 may include heating electronic valves SV2a, SV2b and cooling electronic valves SV1a, SV1 b. The plurality of indoor units 200 may include a cooling indoor unit 210 and a heating indoor unit 220, wherein the cooling indoor unit 210 may include a first indoor heat exchanger 211 and an indoor electronic expansion valve EXV4 correspondingly connected to the first indoor heat exchanger 211, and the heating indoor unit 220 may include a second indoor heat exchanger 221 and an indoor electronic expansion valve EXV5 correspondingly connected to the second indoor heat exchanger 221. A pressure sensor 140 for detecting the discharge pressure of the compressor 110 is also provided at the discharge port of the compressor 110.
When the indoor heating demand is greater than the refrigeration demand (the heating demand is dominant), the system operates in a main heating mode, a high-temperature and high-pressure refrigerant coming out of the compressor 110 flows to the refrigerant distribution device 300 through the four-way valve ST1, enters the heating indoor unit 220 through the heating electromagnetic valve SV2b, emits heat to the indoor, is cooled to be in a low-temperature and high-pressure liquid state, and partially flows to the refrigeration indoor unit 210 to be evaporated and partially flows to the outdoor heat exchanger to be evaporated. The refrigerant gas evaporated in the cooling indoor unit 210 and the refrigerant gas discharged from the outdoor heat exchanger are merged in the outdoor unit 100 and then returned to the compressor 110. The electronic expansion valve EXV5 of the heating indoor unit 220 controls and adjusts the heating quantity according to the supercooling degree, and the electronic expansion valve EXV4 of the refrigerating indoor unit 210 controls and adjusts the refrigerating quantity according to the superheat degree.
Typically, to ensure that the system satisfies the heat balance equation: the heat release of the outdoor heat exchanger, the heat absorption of the refrigerating indoor unit and the power of the compressor are equal to the heat absorption of the heating indoor unit, and the system needs to absorb heat from the refrigerating indoor unit and the outdoor heat exchanger respectively. If the control is not reasonable, the system absorbs excessive heat from the outdoor heat exchanger, and the heat absorbed from the refrigerating indoor unit is reduced according to a heat balance equation, so that the capacity of the refrigerating indoor unit is insufficient.
In order to solve the problem of insufficient capacity of the refrigerating indoor units when the multi-split system simultaneously performs refrigeration and heating, the invention provides a refrigerant distribution control method of the multi-split system, which can reasonably control the distribution of a refrigerant at a low-pressure side so as to ensure the cold and heat balance of the system and further ensure the sufficient capacity of the refrigerating indoor units.
Fig. 2 is a flowchart illustrating a refrigerant distribution control method of a multi-split system according to an embodiment of the present invention.
As shown in fig. 2, a refrigerant distribution control method of a multi-split system according to an embodiment of the present invention may include the following steps:
and S1, when the multi-split air conditioner system operates in the main heating mode, acquiring the actual superheat degree of the refrigerating indoor unit and acquiring the exhaust superheat degree of the compressor. The superheat degree of the discharged gas of the compressor is equal to the discharge temperature of the compressor and the saturation temperature corresponding to the discharge pressure of the compressor, the discharge temperature of the compressor can be obtained in real time through a temperature sensor arranged at the discharge port of the compressor, the discharge pressure of the compressor can be obtained in real time through a pressure sensor arranged at the discharge port of the compressor, and the saturation temperature corresponding to the discharge pressure can be obtained from a preset table.
And S2, controlling the opening degree of the indoor electronic expansion valve corresponding to the refrigerating indoor unit according to the actual superheat degree of the refrigerating indoor unit to adjust the flow of the refrigerant flowing through the refrigerating indoor unit, and controlling the opening degree of the outdoor electronic expansion valve according to the relation between the exhaust superheat degree of the compressor and the preset exhaust superheat degree.
Specifically, the outdoor heat exchanger and the refrigeration indoor unit are in parallel connection, the distribution proportion of the low-pressure refrigerant between the outdoor heat exchanger and the refrigeration indoor unit is determined by the opening proportion relation of the outdoor electronic expansion valve and the indoor electronic expansion valve, and the control of the distribution proportion of the low-pressure refrigerant is the control of the indoor electronic expansion valve and the outdoor electronic expansion valve. When the indoor electronic expansion valve is controlled, when the actual superheat degree of the refrigeration indoor unit is less than the set superheat degree, the opening degree of the indoor electronic expansion valve corresponding to the refrigeration indoor unit is adjusted to be small, and when the actual superheat degree of the refrigeration indoor unit is greater than the set superheat degree, the opening degree of the indoor electronic expansion valve corresponding to the refrigeration indoor unit is adjusted to be large.
When the outdoor electronic valve is controlled, the heat absorption capacity of the outdoor heat exchanger is adjusted according to the exhaust superheat degree of the compressor, when the exhaust superheat degree of the compressor is smaller than the preset exhaust superheat degree, the opening degree of the outdoor electronic expansion valve is adjusted to be small, and when the exhaust superheat degree of the compressor is larger than the preset exhaust superheat degree, the opening degree of the outdoor electronic expansion valve is adjusted to be large.
And S3, in the process of adjusting the flow of the refrigerant flowing through the refrigeration indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the refrigeration indoor unit reaches the preset maximum opening degree, judging whether the refrigeration indoor unit needs to send a superheat correction opening signal to the outdoor unit.
That is, the control of the indoor electronic expansion valve is independent control, the distribution ratio of the low-pressure refrigerant on the side of the refrigerating indoor machine is adjusted according to the actual superheat degree of the indoor machine, and the refrigerant quantity of the refrigerating indoor machine can be effectively adjusted when the opening degree of the electronic expansion valve corresponding to the refrigerating indoor machine does not reach the preset maximum opening degree. However, when the opening degree of the electronic expansion valve corresponding to the indoor unit of the refrigeration system reaches the preset maximum opening degree, the ability of actively adjusting the distribution ratio of the low-pressure refrigerant is lost. At this time, it is necessary to determine whether or not the indoor cooling unit needs to send a superheat correction open signal to the outdoor unit.
According to one embodiment of the present invention, determining whether a refrigeration indoor unit needs to send a superheat correction turn-on signal to an outdoor unit includes: the method comprises the steps of obtaining the return air temperature of a refrigerating indoor unit and the set temperature of the refrigerating indoor unit, judging that the refrigerating indoor unit needs to send a superheat degree correction opening signal to an outdoor unit if the temperature difference value between the return air temperature of the refrigerating indoor unit and the set temperature is larger than the preset temperature difference and the actual superheat degree of the refrigerating indoor unit is larger than the preset superheat degree, and judging that the refrigerating indoor unit needs to send a superheat degree correction closing signal to the outdoor unit if the temperature difference value between the return air temperature of the refrigerating indoor unit and the set temperature is smaller than or equal to the preset temperature difference or the actual superheat degree of the refrigerating indoor unit is smaller than or equal to the preset.
The return air temperature of the refrigeration indoor unit can be acquired in real time through a temperature sensor arranged at the return air inlet of the refrigeration indoor unit. The set temperature, the preset temperature difference and the preset superheat degree of the refrigeration indoor unit can be calibrated according to actual conditions.
Specifically, the judgment is carried out according to the difference value between the return air temperature T1 of the refrigerating indoor unit detected in real time and the set temperature Ts and the actual superheat degree SH of the refrigerating indoor unit. When T1-Ts is larger than a preset temperature difference A and SH is larger than a preset superheat degree B, the refrigerating indoor unit sends a superheat degree correction signal to the outdoor unit, wherein the superheat degree correction signal is turned ON (correction opening signal). When T1-Ts is equal to or less than a or SH is equal to or less than B, the cooling indoor unit transmits a superheat correction signal OFF (correction OFF signal) to the outdoor unit.
And S4, when the outdoor unit receives the superheat correction opening signal and lasts for a first preset time, the current opening degree of the outdoor electronic expansion valve is reduced by increasing the preset exhaust superheat degree. The first preset time can be calibrated according to actual conditions.
According to one embodiment of the invention, when the outdoor unit receives the superheat correction closing signal, if the current opening degree of the outdoor electronic expansion valve is a preset minimum opening degree and lasts for a second preset time, the multi-split air-conditioning system is controlled to be switched to the main cooling mode to operate.
Further, according to an embodiment of the present invention, when the discharge superheat of the compressor is equal to or greater than a preset threshold value, the current opening degree of the outdoor electronic expansion valve is adjusted to be larger by decreasing the preset discharge superheat. The preset threshold value can be calibrated according to actual conditions.
Specifically, the preset exhaust superheat degree of the compressor needs to be corrected according to a correction signal sent by the refrigeration indoor unit, and the correction method comprises the following steps: assuming that the initial value of the preset exhaust superheat degree of the compressor is DSHS1, detecting a correction signal sent by the refrigerating indoor unit at intervals, and increasing the preset exhaust superheat degree of the compressor to close the opening degree of the outdoor electronic expansion valve when the correction signal sent by the refrigerating indoor unit is detected to be ON and lasts for a first preset time t1, so that more low-pressure refrigerants are distributed to the refrigerating indoor unit, and the refrigerating capacity of the refrigerating indoor unit is ensured. And when the correction signal sent by the refrigeration indoor unit is detected to be OFF, stopping correcting the preset exhaust superheat degree of the compressor, and maintaining the current preset exhaust superheat degree to continue running.
In the process of increasing the preset exhaust superheat degree of the compressor, if the preset exhaust superheat degree of the compressor is detected to be higher than a preset threshold value, the current preset superheat degree of the compressor is appropriately reduced to increase the opening degree of the outdoor electronic expansion valve, the exhaust temperature of the compressor is restored to a normal temperature range, and the correction period is t3, wherein t3 can be calibrated according to actual conditions.
Therefore, when the multi-split system performs mixed refrigeration and heating, the preset exhaust superheat degree of the compressor can be corrected through reasonable distribution of low-pressure refrigerants and correction signals sent by the refrigeration indoor units, so that the heat balance of the system is maintained, and the refrigeration capacity of the refrigeration indoor units is ensured.
Further, according to an embodiment of the present invention, when the outdoor unit receives the superheat correction closing signal, if the current opening degree of the outdoor electronic expansion valve is the preset minimum opening degree and lasts for the second preset time, the multi-split air-conditioning system is controlled to switch to the main cooling mode. The preset minimum opening and the second preset time can be calibrated according to actual conditions.
That is, when it is detected that the correction signal sent by the cooling indoor unit is ON and the opening of the outdoor electronic expansion valve is equal to the preset minimum opening for the second preset time t4, it is determined that the cooling demand is greater than the heating demand, and at this time, the operation mode of the multi-split air-conditioning system is switched to the main cooling mode to meet the cooling demand.
In summary, according to the refrigerant distribution control method of the multi-split system in the embodiment of the present invention, when the multi-split system operates in the main heating mode, the actual superheat degree of the refrigeration indoor unit is obtained, the exhaust superheat degree of the compressor is obtained, the opening degree of the indoor electronic expansion valve corresponding to the refrigeration indoor unit is controlled according to the actual superheat degree of the refrigeration indoor unit to adjust the refrigerant flow passing through the refrigeration indoor unit, the opening degree of the outdoor electronic expansion valve is controlled according to the relationship between the exhaust superheat degree of the compressor and the preset exhaust superheat degree, and in the process of adjusting the refrigerant flow passing through the refrigeration indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the refrigeration indoor unit reaches the preset maximum opening degree, it is determined whether the refrigeration indoor unit needs to send a superheat correction opening signal to the outdoor unit; and when the outdoor unit receives the superheat correction opening signal and lasts for a first preset time, the current opening degree of the outdoor electronic expansion valve is reduced by increasing the preset exhaust superheat degree. Therefore, the method can reasonably control the distribution of the refrigerant at the low-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the refrigeration indoor unit.
Fig. 3 is a block diagram illustrating a refrigerant distribution control apparatus of a multi-split system according to an embodiment of the present invention.
In an embodiment of the present invention, the multi-split system may include an outdoor unit, which may include a compressor, an outdoor heat exchanger, an outdoor electronic expansion valve, and a four-way valve, a plurality of indoor units, each of which may include an indoor heat exchanger and an indoor electronic expansion valve, and a refrigerant distribution device, which may include a heating solenoid valve and a cooling solenoid valve.
As shown in fig. 3, the refrigerant distribution control device of the multi-split system according to the embodiment of the present invention may include: the system comprises a first superheat degree acquisition module 10, a second superheat degree acquisition module 20, a first control module 30, a second control module 40 and a determination module 50.
The first superheat degree obtaining module 10 is configured to obtain an actual superheat degree of the indoor refrigeration unit when the multi-split air conditioning system operates in the main heating mode. The second superheat degree obtaining module 20 is used for obtaining the exhaust superheat degree of the compressor when the multi-split air conditioning system operates in the main heating mode. The first control module 30 is configured to control an opening degree of an indoor electronic expansion valve corresponding to the refrigeration indoor unit according to an actual superheat degree of the refrigeration indoor unit to adjust a flow rate of a refrigerant flowing through the refrigeration indoor unit. The second control module 40 is used for controlling the opening degree of the outdoor electronic expansion valve according to the relation between the discharge superheat degree of the compressor and the preset discharge superheat degree. The judging module 50 is configured to, in a process of adjusting a flow rate of a refrigerant flowing through the refrigeration indoor unit, judge whether the refrigeration indoor unit needs to send a superheat correction opening signal to the outdoor unit if an opening degree of an indoor electronic expansion valve corresponding to the refrigeration indoor unit reaches a preset maximum opening degree. The second control module 40 is further configured to decrease the current opening degree of the outdoor electronic expansion valve by increasing the preset exhaust superheat degree when the outdoor unit receives the superheat degree correction opening signal and continues for a first preset time.
According to an embodiment of the present invention, as shown in fig. 4, the refrigerant distribution control device of the multi-split air-conditioning system further includes a temperature obtaining module 60, wherein when the determining module 50 determines whether the indoor refrigeration unit needs to send a superheat correction start signal to the outdoor unit, the temperature obtaining module 60 obtains the return air temperature of the indoor refrigeration unit and the set temperature of the indoor refrigeration unit, and respectively determines a temperature difference between the return air temperature of the indoor refrigeration unit and the set temperature and a superheat of the indoor refrigeration unit, and if the temperature difference between the return air temperature of the indoor refrigeration unit and the set temperature is greater than a preset temperature difference and the actual superheat of the indoor refrigeration unit is greater than a preset superheat, the indoor refrigeration unit needs to send a superheat correction start signal to the outdoor unit. And if the temperature difference between the return air temperature of the refrigerating indoor unit and the set temperature is less than or equal to the preset temperature difference or the actual superheat degree of the refrigerating indoor unit is less than or equal to the preset superheat degree, judging that the refrigerating indoor unit needs to send a superheat degree correction closing signal to the outdoor unit.
According to an embodiment of the present invention, the second control module 40 is further configured to, when the outdoor unit receives the superheat correction closing signal, control the multiple split air conditioning system to switch to the main cooling mode if the current opening degree of the outdoor electronic expansion valve is the preset minimum opening degree and lasts for a second preset time.
According to an embodiment of the present invention, the second control module 40 is further configured to adjust the current opening degree of the outdoor electronic expansion valve to be larger by decreasing the preset discharge superheat degree when the discharge superheat degree of the compressor is greater than or equal to the preset threshold value.
It should be noted that details that are not disclosed in the refrigerant distribution control device of the multi-split air-conditioning system according to the embodiment of the present invention refer to details disclosed in the refrigerant distribution control method of the multi-split air-conditioning system according to the embodiment of the present invention, and are not described herein again in detail.
According to the refrigerant distribution control device of the multi-split system of the embodiment of the invention, when the multi-split system operates in a main heating mode, the actual superheat degree of a refrigerating indoor unit is obtained through a first superheat degree obtaining module, the exhaust superheat degree of a compressor is obtained through a second superheat degree obtaining module, the first control module controls the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit according to the actual superheat degree of the refrigerating indoor unit so as to adjust the flow rate of a refrigerant flowing through the refrigerating indoor unit, the second control module controls the opening degree of an outdoor electronic expansion valve according to the relation between the exhaust superheat degree of the compressor and the preset exhaust superheat degree, and in the process of adjusting the flow rate of the refrigerant flowing through the refrigerating indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the refrigerating indoor unit reaches the preset maximum opening degree, a judging module judges whether the refrigerating indoor unit needs to send a superheat degree correction opening signal to, when the outdoor unit receives the superheat correction opening signal and lasts for a first preset time, the second control module increases the preset exhaust superheat to reduce the current opening degree of the outdoor electronic expansion valve. Therefore, the device can reasonably control the distribution of the refrigerant at the low-pressure side, and ensure the cold and hot balance of the system, thereby ensuring the sufficient capacity of the refrigeration indoor unit.
In addition, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the refrigerant distribution control method of the multi-split system described above.
By executing the refrigerant distribution control method of the multi-split air conditioning system, the non-transitory computer readable storage medium of the embodiment of the invention can reasonably control the low-pressure side refrigerant distribution, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the refrigeration indoor unit.
In addition, an embodiment of the present invention further provides a multi-split air conditioning system, which includes the refrigerant distribution control device of the multi-split air conditioning system.
According to the multi-split system provided by the embodiment of the invention, the refrigerant distribution control device of the multi-split system can reasonably control the refrigerant distribution at the low-pressure side, and the cold and heat balance of the system is ensured, so that the sufficient capacity of the refrigeration indoor unit is ensured.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. The refrigerant distribution control method of the multi-split air conditioning system is characterized in that the multi-split air conditioning system comprises an outdoor unit, a plurality of indoor units and a refrigerant distribution device, the outdoor unit comprises a compressor, an outdoor heat exchanger, an outdoor electronic expansion valve and a four-way valve, the refrigerant distribution device comprises a heating electromagnetic valve and a cooling electromagnetic valve, each indoor unit comprises an indoor heat exchanger and an indoor electronic expansion valve, and the refrigerant distribution control method comprises the following steps:
when the multi-split air conditioner system runs in a main heating mode, acquiring the actual superheat degree of a refrigerating indoor unit and acquiring the exhaust superheat degree of a compressor;
controlling the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit according to the actual superheat degree of the refrigerating indoor unit so as to adjust the flow of a refrigerant flowing through the refrigerating indoor unit, and controlling the opening degree of an outdoor electronic expansion valve according to the relation between the exhaust superheat degree of the compressor and a preset exhaust superheat degree;
in the process of adjusting the flow of the refrigerant flowing through the refrigeration indoor unit, if the opening degree of an indoor electronic expansion valve corresponding to the refrigeration indoor unit reaches a preset maximum opening degree, judging whether the refrigeration indoor unit needs to send a superheat correction opening signal to the outdoor unit;
and when the outdoor unit receives the superheat correction opening signal and lasts for a first preset time, the current opening degree of the outdoor electronic expansion valve is reduced by increasing the preset exhaust superheat degree.
2. The refrigerant distribution control method of a multi-split system as claimed in claim 1, wherein the determining whether the refrigerating indoor unit needs to transmit a superheat correction on signal to the outdoor unit includes:
acquiring the return air temperature of the refrigerating indoor unit and the set temperature of the refrigerating indoor unit;
if the temperature difference value between the return air temperature of the refrigerating indoor unit and the set temperature is larger than the preset temperature difference and the actual superheat degree of the refrigerating indoor unit is larger than the preset superheat degree, judging that the refrigerating indoor unit needs to send a superheat degree correction opening signal to the outdoor unit;
and if the temperature difference between the return air temperature of the refrigeration indoor unit and the set temperature is less than or equal to a preset temperature difference, or the actual superheat degree of the refrigeration indoor unit is less than or equal to a preset superheat degree, judging that the refrigeration indoor unit needs to send a superheat degree correction closing signal to the outdoor unit.
3. The refrigerant distribution control method of a multi-split air conditioning system as claimed in claim 2, wherein when the outdoor unit receives the superheat correction closing signal, if the current opening degree of the outdoor electronic expansion valve is a preset minimum opening degree for a second preset time, the multi-split air conditioning system is controlled to switch to a main cooling mode.
4. The refrigerant distribution control method of a multi-split system as claimed in any one of claims 1 to 3, wherein when a preset discharge superheat of the compressor is equal to or greater than a preset threshold, the preset discharge superheat is decreased to increase the current opening degree of the outdoor electronic expansion valve.
5. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements a refrigerant distribution control method of a multi-split system as set forth in any one of claims 1 to 4.
6. The utility model provides a refrigerant distribution control device of multi-split system, its characterized in that, multi-split system includes off-premises station, a plurality of indoor set and refrigerant distribution device, the off-premises station includes compressor, outdoor heat exchanger, outdoor electronic expansion valve and cross valve, refrigerant distribution device includes heating solenoid valve and refrigeration solenoid valve, every the indoor set includes indoor heat exchanger and indoor electronic expansion valve, refrigerant distribution control device includes:
the first superheat degree acquisition module is used for acquiring the actual superheat degree of the refrigerating indoor unit when the multi-split air conditioning system operates in a main heating mode;
the second superheat degree acquisition module is used for acquiring the exhaust superheat degree of the compressor when the multi-split system operates in a main heating mode;
the first control module is used for controlling the opening degree of an indoor electronic expansion valve corresponding to the refrigeration indoor unit according to the actual superheat degree of the refrigeration indoor unit so as to adjust the flow of a refrigerant flowing through the refrigeration indoor unit;
the second control module is used for controlling the opening degree of the outdoor electronic expansion valve according to the relation between the exhaust superheat degree of the compressor and a preset exhaust superheat degree;
the judging module is used for judging whether the refrigerating indoor unit needs to send a superheat correction opening signal to the outdoor unit or not if the opening degree of an indoor electronic expansion valve corresponding to the refrigerating indoor unit reaches a preset maximum opening degree in the process of regulating the flow of a refrigerant flowing through the refrigerating indoor unit;
the second control module is further used for increasing the preset exhaust superheat degree to reduce the current opening degree of the outdoor electronic expansion valve when the outdoor unit receives the superheat degree correction opening signal and lasts for a first preset time.
7. The refrigerant distribution control device of a multi-split system as claimed in claim 6, further comprising a temperature obtaining module, wherein the judging module obtains the return air temperature of the refrigerating indoor unit and the set temperature of the refrigerating indoor unit through the temperature obtaining module when judging whether the refrigerating indoor unit needs to send a superheat degree correction turn-on signal to the outdoor unit, and respectively judges a temperature difference between the return air temperature of the refrigerating indoor unit and the set temperature and a superheat degree of the refrigerating indoor unit,
if the temperature difference value between the return air temperature of the refrigerating indoor unit and the set temperature is larger than the preset temperature difference and the actual superheat degree of the refrigerating indoor unit is larger than the preset superheat degree, judging that the refrigerating indoor unit needs to send a superheat degree correction opening signal to the outdoor unit;
and if the temperature difference between the return air temperature of the refrigeration indoor unit and the set temperature is less than or equal to a preset temperature difference, or the actual superheat degree of the refrigeration indoor unit is less than or equal to a preset superheat degree, judging that the refrigeration indoor unit needs to send a superheat degree correction closing signal to the outdoor unit.
8. The refrigerant distribution control device of a multi-split air-conditioning system as claimed in claim 7, wherein the second control module is further configured to control the multi-split air-conditioning system to switch to a main cooling mode if the current opening degree of the outdoor electronic expansion valve is a preset minimum opening degree for a second preset time period when the outdoor unit receives the superheat degree correction closing signal.
9. The refrigerant distribution control device of a multi-split system as claimed in any one of claims 6 to 8, wherein the second control module is further configured to increase the current opening degree of the outdoor electronic expansion valve by decreasing a preset discharge superheat degree of the compressor when the preset discharge superheat degree is equal to or greater than a preset threshold value.
10. A multi-split system, comprising the refrigerant distribution control device of the multi-split system as set forth in any one of claims 6 to 9.
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CN114719470A (en) * 2022-03-24 2022-07-08 浙江中广电器集团股份有限公司 Accurate control method of electronic expansion valve based on exhaust temperature control
CN114791151B (en) * 2022-05-16 2023-11-24 美的集团武汉暖通设备有限公司 Control method and device for electronic expansion valve of air conditioner, air conditioner and storage medium
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CN114857664B (en) * 2022-05-30 2023-11-28 青岛海信日立空调系统有限公司 Multi-split air conditioner system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04353369A (en) * 1991-05-30 1992-12-08 Mitsubishi Electric Corp Air conditioner
CN104748426A (en) * 2015-03-31 2015-07-01 广东美的暖通设备有限公司 Multi-split system
CN105066539A (en) * 2015-07-16 2015-11-18 广东美的暖通设备有限公司 Multiple-on-line system and electronic expansion valve control method thereof
CN105115199A (en) * 2015-07-06 2015-12-02 广东美的暖通设备有限公司 VFRVV VRF air conditioning system refrigerant diversion control method and device
CN105928266A (en) * 2016-05-23 2016-09-07 广东美的暖通设备有限公司 Multi-online system and control method for heating and throttling element of multi-online system
CN105972860A (en) * 2016-04-29 2016-09-28 广东美的暖通设备有限公司 Multi-split system and valve control method of supercooling return circuit of multi-split system
CN106871476A (en) * 2017-02-17 2017-06-20 珠海格力电器股份有限公司 The control method and device of a kind of net for air-source heat pump units and its electric expansion valve
CN106907876A (en) * 2017-02-21 2017-06-30 广东美的暖通设备有限公司 Air-conditioning system and its evaporating temperature control method

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04353369A (en) * 1991-05-30 1992-12-08 Mitsubishi Electric Corp Air conditioner
CN104748426A (en) * 2015-03-31 2015-07-01 广东美的暖通设备有限公司 Multi-split system
CN105115199A (en) * 2015-07-06 2015-12-02 广东美的暖通设备有限公司 VFRVV VRF air conditioning system refrigerant diversion control method and device
CN105066539A (en) * 2015-07-16 2015-11-18 广东美的暖通设备有限公司 Multiple-on-line system and electronic expansion valve control method thereof
CN105972860A (en) * 2016-04-29 2016-09-28 广东美的暖通设备有限公司 Multi-split system and valve control method of supercooling return circuit of multi-split system
CN105928266A (en) * 2016-05-23 2016-09-07 广东美的暖通设备有限公司 Multi-online system and control method for heating and throttling element of multi-online system
CN106871476A (en) * 2017-02-17 2017-06-20 珠海格力电器股份有限公司 The control method and device of a kind of net for air-source heat pump units and its electric expansion valve
CN106907876A (en) * 2017-02-21 2017-06-30 广东美的暖通设备有限公司 Air-conditioning system and its evaporating temperature control method

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