CN107940826B - 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 PDFInfo
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- CN107940826B CN107940826B CN201711105648.5A CN201711105648A CN107940826B CN 107940826 B CN107940826 B CN 107940826B CN 201711105648 A CN201711105648 A CN 201711105648A CN 107940826 B CN107940826 B CN 107940826B
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/05—Refrigerant levels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- 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
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- 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 a main refrigeration mode, acquiring the actual supercooling degree of the heating indoor unit, and controlling the opening of an indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow of a refrigerant flowing through the heating indoor unit; in the process of adjusting the flow of the refrigerant flowing through the heating indoor unit, if the opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree, judging whether the refrigerant shortage occurs in the heating indoor unit; if the heating indoor unit has insufficient refrigerant and lasts for a first preset time, sending an insufficient refrigerant starting signal to the outdoor unit; when the outdoor unit receives the refrigerant shortage opening signal, the current opening degree of the outdoor electronic expansion valve is adjusted to be small so as to reduce the refrigerant distribution quantity of the outdoor heat exchanger, and therefore the capacity of the heating indoor unit is sufficient.
Description
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, for example, in the transition season of spring and autumn, there may be heating demand in the rooms at the periphery of the building, while the rooms inside the building are prone to getting hot and humid due to heat accumulation, resulting in cooling demand. The heat pump multi-split air conditioner system cannot control the outdoor heat exchanger to absorb and release heat simultaneously. The three-pipe multi-split system can effectively transfer the heat load of the refrigerating indoor unit to the heating indoor unit, meet the requirements of refrigerating and heating simultaneously, effectively reduce the output power of the compressor and enable the system to run more energy-saving.
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 on the high-pressure side, and ensure the cold-heat balance of the system, thereby ensuring the sufficient capacity of the heating 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 conditioning system operates in a main refrigeration mode, acquiring the actual supercooling degree of a heating indoor unit, and controlling the opening of an indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow of a refrigerant flowing through the heating indoor unit; in the process of adjusting the flow of the refrigerant flowing through the heating indoor unit, if the opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree, judging whether the heating indoor unit is insufficient in refrigerant; if the heating indoor unit has insufficient refrigerant and lasts for a first preset time, sending an insufficient refrigerant starting signal to the outdoor unit; and when the outdoor unit receives the refrigerant shortage opening signal, the current opening degree of the outdoor electronic expansion valve is reduced so as to reduce the refrigerant distribution amount of the outdoor heat exchanger.
According to the refrigerant distribution control method of the multi-split system in the embodiment of the invention, when the multi-split system operates in the main refrigeration mode, the actual supercooling degree of the heating indoor unit is obtained, and the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit is controlled according to the actual supercooling degree of the heating indoor unit so as to adjust the flow rate of the refrigerant flowing through the heating indoor unit, in the process of adjusting the flow of the refrigerant flowing through the heating indoor unit, if the opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree, whether the refrigerant shortage occurs in the heating indoor unit is judged, if the heating indoor unit has insufficient refrigerant and lasts for a first preset time, an insufficient refrigerant starting signal is sent to the outdoor unit, when the outdoor unit receives the refrigerant shortage opening signal, the current opening degree of the outdoor electronic expansion valve is adjusted to be small so as to reduce the refrigerant distribution quantity of the outdoor heat exchanger. Therefore, the method can reasonably control the distribution of the refrigerant at the high-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the heating 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 indoor heating unit has a refrigerant shortage includes: acquiring the return air temperature of the heating indoor unit and the set temperature of the heating indoor unit; if the temperature difference value between the set temperature of the heating indoor unit and the return air temperature is greater than the preset temperature difference and the actual supercooling degree of the heating indoor unit is greater than the preset supercooling degree, judging that the refrigerant shortage occurs in the heating indoor unit; and if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is less than or equal to the preset temperature difference, or the actual supercooling degree of the heating indoor unit is less than or equal to the preset supercooling degree, judging that the heating indoor unit is not lack of the refrigerant.
According to an embodiment of the present invention, when the heating indoor unit does not have a refrigerant shortage, an insufficient refrigerant closing signal is sent to the outdoor unit, wherein when the outdoor unit receives the insufficient refrigerant closing signal, if the discharge pressure of the compressor is greater than a preset pressure, the current opening of the outdoor electronic expansion valve is increased to increase the refrigerant distribution amount of the outdoor heat exchanger.
According to an embodiment of the present invention, after the current opening degree of the outdoor electronic expansion valve is decreased, if the outdoor unit still receives the insufficient refrigerant opening signal and the current opening degree of the outdoor electronic expansion valve is less than or equal to a preset minimum opening degree and continues for a second preset time, the multi-split air-conditioning system is controlled to switch to a main heating mode.
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 refrigerant distribution of the high-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the heating indoor unit.
In order to achieve the above object, a third embodiment of the present invention provides a refrigerant distribution control device of 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 supercooling degree acquisition module is used for acquiring the actual supercooling degree of the heating indoor unit when the multi-split system operates in a main refrigeration mode; the first control module is used for controlling the opening of an indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow of a refrigerant flowing through the heating indoor unit; the system comprises a judging module, a control module and a control module, wherein the judging module is used for judging whether the heating indoor unit has insufficient refrigerant or not if the opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree in the process of regulating the flow of the refrigerant flowing through the heating indoor unit, and the heating indoor unit sends an insufficient refrigerant opening signal to the outdoor unit when the refrigerant is insufficient and lasts for a first preset time; and the second control module is used for reducing the current opening degree of the outdoor electronic expansion valve when the outdoor unit receives the refrigerant shortage opening signal so as to reduce the refrigerant distribution quantity of the outdoor heat exchanger.
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 the main cooling mode, the first supercooling degree acquisition module acquires the actual supercooling degree of the heating indoor unit, the first control module controls the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow rate of the refrigerant flowing through the heating indoor unit, in the process of adjusting the flow rate of the refrigerant flowing through the heating indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit reaches the preset maximum opening degree, the judgment module judges whether the heating indoor unit has refrigerant shortage, wherein the heating indoor unit sends a refrigerant shortage opening signal to the outdoor unit when the refrigerant shortage occurs and lasts for the first preset time, and when the refrigerant shortage opening signal is received, the second control module adjusts the current opening degree of the outdoor electronic expansion valve to be small, to reduce the refrigerant distribution of the outdoor heat exchanger. Therefore, the device can reasonably control the distribution of the refrigerant at the high-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the heating 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 the multi-split air-conditioning system further includes a temperature obtaining module, wherein when the judging module judges whether the heating indoor unit is insufficient in refrigerant, the temperature obtaining module obtains a return air temperature of the heating indoor unit and a set temperature of the heating indoor unit, and respectively judges a temperature difference between the set temperature and the return air temperature of the heating indoor unit and an actual supercooling degree of the heating indoor unit, and if the temperature difference between the set temperature and the return air temperature of the heating indoor unit is greater than a preset temperature difference and the actual supercooling degree of the heating indoor unit is greater than the preset supercooling degree, the heating indoor unit is judged to be insufficient in refrigerant; and if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is less than or equal to the preset temperature difference, or the actual supercooling degree of the heating indoor unit is less than or equal to the preset supercooling degree, judging that the heating indoor unit is not lack of the refrigerant.
According to an embodiment of the present invention, when the heating indoor unit does not have a refrigerant shortage, the heating indoor unit sends a refrigerant shortage closing signal to the outdoor unit, wherein when the outdoor unit receives the refrigerant shortage closing signal, if the discharge pressure of the compressor is greater than a preset pressure, the second control module increases the current opening degree of the outdoor electronic expansion valve to increase the refrigerant distribution amount of the outdoor heat exchanger.
According to an embodiment of the present invention, the second control module is further configured to, after the current opening degree of the outdoor electronic expansion valve is decreased, control the multiple split air-conditioning system to switch to a main heating mode if the outdoor unit still receives the refrigerant shortage opening signal and the current opening degree of the outdoor electronic expansion valve is less than or equal to a preset minimum opening degree for a second preset time.
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 air conditioner system, the refrigerant distribution control device of the multi-split air conditioner system can reasonably control the refrigerant distribution of the high-pressure side, and the cold and heat balance of the system is ensured, so that the sufficient capacity of the heating 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 refrigeration demand is greater than the heating demand (the refrigeration demand is dominant), the system operates in a main refrigeration mode, a part of high-temperature and high-pressure refrigerant from 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 space, and is cooled to be in a low-temperature and high-pressure liquid state; the other part flows to the outdoor heat exchangers (the first outdoor heat exchanger 120 and the second outdoor heat exchanger 130), where heat is released and cooled to a low-temperature and high-pressure liquid state. The liquid refrigerant from the outdoor heat exchanger and the heating indoor unit 220 is mixed in the refrigerant distribution device 300, and then flows to the cooling indoor unit 210 to be evaporated, and the gaseous refrigerant evaporated by the first indoor heat exchanger 211 in the cooling indoor unit 210 returns to the suction end of 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.
In general, in order to reduce noise and improve cooling effect, the high pressure liquid pipe is required to maintain a certain supercooling degree, and the electronic expansion valves (EXV1 and EXV2) of the outdoor heat exchanger are set to a large opening degree, so that the outdoor heat exchanger bears a large amount of heat radiation and maintains the supercooling degree of the high pressure liquid pipe. Meanwhile, to ensure that the system satisfies the heat balance equation: the heat release of the outdoor heat exchanger and the heat release of the heating indoor unit are equal to the heat absorption of the refrigerating indoor unit and the power of the compressor, if the control is unreasonable, the system emits excessive heat in the outdoor heat exchanger, and the heat emitted from the heating indoor unit is reduced according to a heat balance equation, so that the problem of poor heating effect of the heating indoor unit is caused.
In order to solve the problem that the heating effect of a heating indoor unit is poor when a multi-split air conditioner system simultaneously performs cooling and heating, the invention provides a refrigerant distribution control method of the multi-split air conditioner system, which can reasonably control the distribution of a refrigerant at a high-pressure side so as to ensure the cold-heat balance of the system and further ensure the sufficient capacity of the heating indoor unit.
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 cooling mode, acquiring the actual supercooling degree of the heating indoor unit, and controlling the opening of the indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow of the refrigerant flowing through the heating indoor unit. The actual supercooling degree (refrigerant outlet supercooling degree of the heating indoor unit) of the heating indoor unit is the saturation temperature corresponding to the outlet refrigerant pressure of the heating indoor unit-the outlet refrigerant temperature of the heating indoor unit, the outlet refrigerant pressure is obtained in real time through a pressure sensor arranged at the outlet of the heating indoor unit, the saturation temperature corresponding to the outlet refrigerant pressure is obtained through table lookup, and the outlet refrigerant temperature is obtained in real time through a temperature sensor arranged at the outlet of the heating indoor unit.
Specifically, the outdoor heat exchanger and the heating indoor unit are connected in parallel, the distribution ratio of the high-pressure refrigerant between the outdoor heat exchanger and the heating indoor unit is determined by the opening ratio of the outdoor electronic expansion valve and the indoor electronic expansion valve, and the control of the distribution ratio of the high-pressure refrigerant is the control of the indoor electronic expansion valve and the outdoor electronic expansion valve. When the actual supercooling degree of the indoor unit is smaller than the set supercooling degree, the opening of the indoor electronic expansion valve corresponding to the heating indoor unit is reduced by a certain value K1 to reduce the amount of the refrigerant flowing through the heating indoor unit, and when the actual supercooling degree of the heating indoor unit is larger than the set supercooling degree, the opening of the indoor electronic expansion valve corresponding to the heating indoor unit is increased by a certain value K2 to increase the amount of the refrigerant flowing through the heating indoor unit.
And S2, in the process of adjusting the flow of the refrigerant flowing through the heating indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit reaches the preset maximum opening degree, judging whether the heating indoor unit is lack of the refrigerant.
That is to say, the control of the indoor electronic expansion valve is independent control, the distribution proportion of the high-pressure refrigerant in the heating indoor unit is adjusted according to the actual supercooling degree of the indoor unit, and the refrigerant quantity of the heating indoor unit can be effectively adjusted when the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit does not reach the maximum opening degree. However, when the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit reaches the preset maximum opening degree, the ability of actively adjusting the distribution ratio of the high-pressure refrigerant is lost, and at this time, a signal indicating whether the high-pressure refrigerant can meet the demand of the outdoor unit needs to be sent to the outdoor unit, that is, whether the refrigerant shortage occurs in the heating indoor unit needs to be judged.
According to one embodiment of the present invention, determining whether a refrigerant shortage occurs in a heating indoor unit includes: the method comprises the steps of obtaining the return air temperature of the heating indoor unit and the set temperature of the heating indoor unit, judging that the heating indoor unit is insufficient if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is larger than the preset temperature difference and the actual supercooling degree of the heating indoor unit is larger than the preset supercooling degree, and judging that the heating indoor unit is not insufficient if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is smaller than or equal to the preset temperature difference or the actual supercooling degree of the heating indoor unit is smaller than or equal to the preset supercooling degree. The return air temperature of the heating indoor unit can be acquired in real time through a temperature sensor arranged at the outlet of the return air inlet of the heating indoor unit. The set temperature, the preset temperature difference and the preset supercooling degree of the heating 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 heating indoor unit detected in real time and the set temperature Ts and the actual supercooling degree SC of the heating indoor unit. When Ts-T1 is larger than a preset temperature difference A and SC is larger than a preset supercooling degree B, the refrigerant shortage of the heating indoor unit is indicated. When Ts-T1 is less than or equal to A or SC is less than or equal to B, the heating indoor unit is not lack of refrigerant.
S3, if the heating indoor unit has insufficient refrigerant and lasts for a first preset time, the indoor unit sends an insufficient refrigerant opening signal to the outdoor unit. The first preset time can be calibrated according to actual conditions.
And S4, when the outdoor unit receives the refrigerant shortage opening signal, the current opening of the outdoor electronic expansion valve is reduced to reduce the refrigerant distribution amount of the outdoor heat exchanger.
According to one embodiment of the present invention, when the heating indoor unit does not have a refrigerant shortage, an insufficient refrigerant closing signal is sent to the outdoor unit, wherein when the outdoor unit receives the insufficient refrigerant closing signal, if the discharge pressure of the compressor is greater than a preset pressure, the current opening of the outdoor electronic expansion valve is increased to increase the refrigerant distribution amount of the outdoor heat exchanger.
Specifically, when the indoor electronic expansion valve corresponding to the heating indoor unit loses the capability of actively adjusting the high-pressure refrigerant distribution ratio, the refrigerant distribution amount of the outdoor heat exchanger is adjusted according to the discharge pressure of the compressor and a signal whether the refrigerant sent by the heating indoor unit is sufficient or not.
Specifically, when the heating indoor unit sends a refrigerant shortage signal (ON), and the first preset time t1 lasts, the current opening of the outdoor electronic expansion valve is reduced to reduce the refrigerant distribution amount of the outdoor heat exchanger, so that more high-temperature and high-pressure refrigerants flow into the heating indoor unit. When the refrigerant quantity shortage signal of the heating indoor unit is OFF (refrigerant shortage closing signal) and the exhaust pressure of the compressor exceeds the preset pressure, the current opening of the outdoor electronic expansion valve is adjusted to be larger so as to increase the distributed refrigerant quantity of the outdoor heat exchanger and reduce the high pressure of the system.
Therefore, when the multi-split system performs mixed cooling and heating, the heat balance of the system is maintained through reasonable distribution of the high-pressure refrigerant, and the heating capacity of the heating indoor unit is ensured.
Further, according to an embodiment of the present invention, after the current opening degree of the outdoor electronic expansion valve is decreased, if the outdoor unit still receives the refrigerant shortage opening signal and the current opening degree of the outdoor electronic expansion valve is less than or equal to the preset minimum opening degree for the second preset time, the multi-split system is controlled to switch to the main heating mode. The preset minimum opening and the second preset time can be calibrated according to actual conditions.
That is, when the outdoor unit receives a refrigerant shortage signal ON sent by the heating indoor unit, the current opening degree of the outdoor electronic expansion valve is reduced, and in the process of reducing the opening degree of the outdoor electronic expansion valve, if the outdoor unit still receives the refrigerant shortage signal ON and the current opening degree of the outdoor electronic expansion valve is less than or equal to the preset minimum opening degree and lasts for two preset times t4, it is determined that the heating requirement is greater than the cooling requirement, and at this time, the operation mode of the multi-split air-conditioning system is switched to the main heating mode to meet the heating requirement.
In summary, according to the refrigerant distribution control method of the multi-split system in the embodiment of the invention, when the multi-split system operates in the main cooling mode, the actual supercooling degree of the heating indoor unit is obtained, and the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit is controlled according to the actual supercooling degree of the heating indoor unit so as to adjust the flow rate of the refrigerant flowing through the heating indoor unit, in the process of adjusting the flow of the refrigerant flowing through the heating indoor unit, if the opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree, whether the refrigerant shortage occurs in the heating indoor unit is judged, if the heating indoor unit has insufficient refrigerant and lasts for a first preset time, an insufficient refrigerant starting signal is sent to the outdoor unit, when the outdoor unit receives the refrigerant shortage opening signal, the current opening degree of the outdoor electronic expansion valve is adjusted to be small so as to reduce the refrigerant distribution quantity of the outdoor heat exchanger. Therefore, the method can reasonably control the distribution of the refrigerant at the high-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the heating 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 supercooling degree calculating method comprises a first supercooling degree obtaining module 10, a first control module 20, a judging module 30 and a second control module 40.
The first supercooling degree obtaining module 10 is configured to obtain an actual supercooling degree of the heating indoor unit when the multi-split air conditioning system operates in the main cooling mode. The first control module 20 is configured to control an opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit according to an actual supercooling degree of the heating indoor unit, so as to adjust a flow rate of a refrigerant flowing through the heating indoor unit. The determining module 30 is configured to determine whether the heating indoor unit is insufficient in refrigerant if an opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree in a process of adjusting a flow rate of a refrigerant flowing through the heating indoor unit, where the heating indoor unit sends an insufficient refrigerant opening signal to the outdoor unit when insufficient refrigerant occurs and lasts for a first preset time. The second control module 40 is configured to decrease the current opening of the outdoor electronic expansion valve when the outdoor unit receives the insufficient refrigerant opening signal, so as to reduce the refrigerant distribution amount of the outdoor heat exchanger.
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 50, wherein the judging module 30 obtains the return air temperature of the heating indoor unit and the set temperature of the heating indoor unit through the temperature obtaining module 50 when judging whether the heating indoor unit is in a refrigerant shortage state, and respectively judges a temperature difference between the set temperature of the heating indoor unit and the return air temperature and an actual supercooling degree of the heating indoor unit, if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is greater than a preset temperature difference and the actual supercooling degree of the heating indoor unit is greater than the preset supercooling degree, it is judged that the heating indoor unit is in a refrigerant shortage state, if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is less than or equal to the preset temperature difference, or the actual supercooling degree of the heating indoor unit is less than or equal to the, it is judged that the refrigerant shortage does not occur in the heating indoor unit.
According to an embodiment of the present invention, the heating indoor unit sends an insufficient refrigerant closing signal to the outdoor unit when insufficient refrigerant does not occur, wherein when the outdoor unit receives the insufficient refrigerant closing signal, if the discharge pressure of the compressor is greater than a preset pressure, the second control module 40 increases the current opening degree of the outdoor electronic expansion valve to increase the refrigerant distribution amount of the outdoor heat exchanger.
According to an embodiment of the present invention, the second control module 40 is further configured to, after the current opening degree of the outdoor electronic expansion valve is decreased, control the multi-split air-conditioning system to switch to the main heating mode if the outdoor unit still receives the refrigerant shortage opening signal and the current opening degree of the outdoor electronic expansion valve is less than or equal to the preset minimum opening degree for a second preset time.
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 the main cooling mode, the first supercooling degree acquisition module acquires the actual supercooling degree of the heating indoor unit, the first control module controls the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow rate of the refrigerant flowing through the heating indoor unit, in the process of adjusting the flow rate of the refrigerant flowing through the heating indoor unit, if the opening degree of the indoor electronic expansion valve corresponding to the heating indoor unit reaches the preset maximum opening degree, the judgment module judges whether the heating indoor unit has refrigerant shortage, wherein the heating indoor unit sends a refrigerant shortage opening signal to the outdoor unit when the refrigerant shortage occurs and lasts for the first preset time, and when the refrigerant shortage opening signal is received, the second control module adjusts the current opening degree of the outdoor electronic expansion valve to be small, to reduce the refrigerant distribution of the outdoor heat exchanger. Therefore, the device can reasonably control the distribution of the refrigerant at the high-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the heating 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 refrigerant distribution of the high-pressure side, and ensure the cold and heat balance of the system, thereby ensuring the sufficient capacity of the heating 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 air conditioner system, the refrigerant distribution control device of the multi-split air conditioner system can reasonably control the refrigerant distribution of the high-pressure side, and the cold and heat balance of the system is ensured, so that the sufficient capacity of the heating 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 comprises an outdoor unit, a plurality of indoor units and a refrigerant distribution device, wherein 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 refrigerating electromagnetic valve, and each indoor unit comprises an indoor heat exchanger and an indoor electronic expansion valve, and the refrigerant distribution control method is characterized by comprising the following steps:
when the multi-split air conditioning system operates in a main refrigeration mode, acquiring the actual supercooling degree of a heating indoor unit, and controlling the opening of an indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow of a refrigerant flowing through the heating indoor unit;
in the process of adjusting the flow of the refrigerant flowing through the heating indoor unit, if the opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree, judging whether the heating indoor unit is insufficient in refrigerant;
if the heating indoor unit has insufficient refrigerant and lasts for a first preset time, sending an insufficient refrigerant starting signal to the outdoor unit;
and when the outdoor unit receives the refrigerant shortage opening signal, the current opening degree of the outdoor electronic expansion valve is reduced so as to reduce the refrigerant distribution amount of the outdoor heat exchanger.
2. The method for controlling refrigerant distribution in a multi-split system as claimed in claim 1, wherein determining whether the heating indoor unit has a refrigerant shortage comprises:
acquiring the return air temperature of the heating indoor unit and the set temperature of the heating indoor unit;
if the temperature difference value between the set temperature of the heating indoor unit and the return air temperature is greater than the preset temperature difference and the actual supercooling degree of the heating indoor unit is greater than the preset supercooling degree, judging that the refrigerant shortage occurs in the heating indoor unit;
and if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is less than or equal to the preset temperature difference, or the actual supercooling degree of the heating indoor unit is less than or equal to the preset supercooling degree, judging that the heating indoor unit is not lack of the refrigerant.
3. The refrigerant distribution control method of a multi-split system as claimed in claim 2, wherein when the heating indoor unit does not have a refrigerant shortage, an insufficient refrigerant closing signal is transmitted to the outdoor unit, and when the outdoor unit receives the insufficient refrigerant closing signal, if a discharge pressure of the compressor is greater than a preset pressure, a current opening degree of the outdoor electronic expansion valve is increased to increase a refrigerant distribution amount of the outdoor heat exchanger.
4. The method for controlling distribution of refrigerant in a multi-split air-conditioning system as claimed in any one of claims 1 to 3, wherein after the current opening degree of the outdoor electronic expansion valve is decreased, if the outdoor unit still receives the refrigerant shortage opening signal and the current opening degree of the outdoor electronic expansion valve is less than or equal to a preset minimum opening degree for a second preset time, the multi-split air-conditioning system is controlled to switch to a main heating mode.
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, the 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 is including heating solenoid valve and refrigeration solenoid valve, every the indoor set includes indoor heat exchanger and indoor electronic expansion valve, its characterized in that, refrigerant distribution control device includes:
the first supercooling degree acquisition module is used for acquiring the actual supercooling degree of the heating indoor unit when the multi-split system operates in a main refrigeration mode;
the first control module is used for controlling the opening of an indoor electronic expansion valve corresponding to the heating indoor unit according to the actual supercooling degree of the heating indoor unit so as to adjust the flow of a refrigerant flowing through the heating indoor unit;
the system comprises a judging module, a control module and a control module, wherein the judging module is used for judging whether the heating indoor unit has insufficient refrigerant or not if the opening degree of an indoor electronic expansion valve corresponding to the heating indoor unit reaches a preset maximum opening degree in the process of regulating the flow of the refrigerant flowing through the heating indoor unit, and the heating indoor unit sends an insufficient refrigerant opening signal to the outdoor unit when the refrigerant is insufficient and lasts for a first preset time;
and the second control module is used for reducing the current opening degree of the outdoor electronic expansion valve when the outdoor unit receives the refrigerant shortage opening signal so as to reduce the refrigerant distribution quantity of the outdoor heat exchanger.
7. The refrigerant distribution control device of a multi-split system as claimed in claim 6, further comprising a temperature acquisition module, wherein the determination module acquires the return air temperature of the heating indoor unit and the set temperature of the heating indoor unit through the temperature acquisition module when determining whether the cooling indoor unit is in a refrigerant shortage state, and respectively determines a temperature difference between the set temperature and the return air temperature of the heating indoor unit and an actual supercooling degree of the heating indoor unit,
if the temperature difference value between the set temperature of the heating indoor unit and the return air temperature is greater than the preset temperature difference and the actual supercooling degree of the heating indoor unit is greater than the preset supercooling degree, judging that the refrigerant shortage occurs in the heating indoor unit;
and if the temperature difference between the set temperature of the heating indoor unit and the return air temperature is less than or equal to the preset temperature difference, or the actual supercooling degree of the heating indoor unit is less than or equal to the preset supercooling degree, judging that the heating indoor unit is not lack of the refrigerant.
8. The refrigerant distribution control device of a multi-split system as claimed in claim 7, wherein the heating indoor unit transmits an insufficient refrigerant closing signal to the outdoor unit when no insufficient refrigerant occurs, wherein the second control module increases the current opening degree of the outdoor electronic expansion valve to increase the refrigerant distribution amount of the outdoor heat exchanger if the discharge pressure of the compressor is greater than a preset pressure when the outdoor unit receives the insufficient refrigerant closing signal.
9. The refrigerant distribution control device of a multi-split air conditioning system as claimed in any one of claims 6 to 8, wherein the second control module is further configured to, after the current opening degree of the outdoor electronic expansion valve is decreased, control the multi-split air conditioning system to switch to a main heating mode if the outdoor unit still receives the insufficient refrigerant opening signal and the current opening degree of the outdoor electronic expansion valve is less than or equal to a preset minimum opening degree for a second preset time.
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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