CN109916043B - Mode switching control method and air conditioning system - Google Patents
Mode switching control method and air conditioning system Download PDFInfo
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- CN109916043B CN109916043B CN201910107075.2A CN201910107075A CN109916043B CN 109916043 B CN109916043 B CN 109916043B CN 201910107075 A CN201910107075 A CN 201910107075A CN 109916043 B CN109916043 B CN 109916043B
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Abstract
The invention discloses a mode switching control method and an air conditioning system. The mode switching control method comprises the following steps: judging whether a control instruction for switching the operation mode of the indoor unit is received or not, and executing a first switching action under the condition of receiving the control instruction for switching the operation mode of the indoor unit, wherein the first switching action comprises controlling an indoor fan to be closed or to be operated at a preset gear and controlling an electronic expansion valve to be adjusted to a preset opening degree. According to the mode switching control method, the indoor fan is controlled to be closed or the electronic expansion valve is controlled to operate at the preset gear and to be adjusted to the preset opening, the condensation effect of the refrigerant in the indoor unit is favorably weakened, the amount of the liquid refrigerant in the indoor unit is reduced, on one hand, the time for pressure equalization through the indoor heat exchanger and environment heat exchange can be shortened, the side pressure of the indoor unit can reach the pressure value under the limitation of the environment temperature more quickly, on the other hand, the time for pressure equalization after switching can be shortened, the impact force of the refrigerant can be reduced, and finally, the effect of reducing the noise value in the mode switching process can be.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a mode switching control method and an air conditioning system.
Background
In the related art, with the development of the multi-split air-conditioning technology, a multi-split air-conditioning product as an energy-saving and efficient air-conditioning system will be more and more popular. At present, a multi-split air conditioning system can be switched between different operation modes by adopting a check valve as a main control means, but in the mode switching process, for example, when a heating mode is switched to a cooling mode, defrosting and oil returning, at the moment of high-pressure and low-pressure conduction, the pressure difference between high pressure and low pressure is large, the pressure equalizing time is long, and under the condition of excessive liquid refrigerant amount in an indoor unit, large noise is often generated and the liquid refrigerant amount lasts for a long time, so that the user experience is influenced.
Disclosure of Invention
The embodiment of the invention provides a mode switching control method and an air conditioning system.
The mode switching control method is used for the air conditioning system. The air conditioning system comprises a refrigerant distributor, an indoor unit and an electronic expansion valve, wherein the indoor unit comprises an indoor fan, and the mode switching control method comprises the following steps:
judging whether a control instruction for switching the operation mode of the indoor unit is received;
and under the condition of receiving a control instruction of the indoor unit for switching the operation mode, executing a first switching action, wherein the first switching action comprises controlling the indoor fan to be closed or to operate at a preset gear and controlling the electronic expansion valve to be adjusted to a preset opening.
In the mode switching control method of the above embodiment, under the condition that a control instruction for switching the operation mode of the indoor unit is received, the indoor fan is controlled to be turned off or operated at a preset gear and the electronic expansion valve is controlled to be adjusted to a preset opening degree, which is beneficial to weakening the condensation effect of the indoor unit on the refrigerant, so that the amount of the liquid refrigerant in the indoor unit is reduced, on one hand, the time for pressure equalization through heat exchange between the indoor heat exchanger and the environment can be shortened, the pressure of the indoor unit side can reach the pressure value under the limit of the ambient temperature more quickly, on the other hand, the time for pressure equalization after switching and the impact force of the refrigerant can be shortened, and finally, the effects of reducing noise and.
In some embodiments, the operation modes include a heating mode and a cooling mode, the control instruction is that the indoor unit is switched from the heating mode to the cooling mode, and the mode switching control method includes:
judging whether the air conditioning system meets a first condition under the condition of executing the first switching action;
executing a second switching action when the air conditioning system meets the first condition when executing the first switching action;
the second switching action comprises controlling the indoor fan to be opened and controlling the electronic expansion valve to be closed;
the first condition comprises one of the following conditions:
controlling the indoor fan to be closed or to run at the preset gear and controlling the electronic expansion valve to adjust the time length of the preset opening degree to last for a first preset time length;
under the condition that the indoor unit is in the heating mode, the supercooling degree of the indoor unit is smaller than a preset supercooling degree;
and the effusion coefficient of the indoor unit is smaller than a preset value.
In some embodiments, the indoor unit includes an indoor heat exchanger, and the mode switching control method includes:
judging whether the air conditioning system meets a second condition under the condition of executing the second switching action;
when the air conditioning system meets the second condition under the condition that the second switching action is executed, controlling the indoor unit to be switched from the heating mode to the cooling mode;
the second condition includes one of the following conditions:
controlling the indoor fan to be opened and controlling the closing time of the electronic expansion valve to last for a second preset time;
the temperature of the indoor heat exchanger is less than or equal to a preset temperature;
the absolute value of the difference between the temperature of the indoor heat exchanger and the ambient temperature is within a preset range;
the pressure of the indoor heat exchanger is less than or equal to a preset pressure.
In some embodiments, the air conditioning system includes a control valve, and the mode switching control method includes:
and controlling the control valve to open or close to control the indoor unit to switch the running mode.
In some embodiments, the controlling valve includes an electronic valve, the indoor unit includes an indoor heat exchanger, the electronic valve is connected to the indoor heat exchanger, the operation modes include a heating mode and a cooling mode, and controlling the controlling valve to open or close to control the indoor unit to switch the operation modes includes:
and controlling the electronic valve to be switched from closed to open so as to switch the operation mode of the indoor unit from the heating mode to the cooling mode.
In some embodiments, the control valve includes a first electronic valve and a second electronic valve, the indoor unit includes an indoor heat exchanger, the first electronic valve and the second electronic valve are connected to the indoor heat exchanger, the operation mode includes a cooling mode and a heating mode, and the control valve is controlled to be opened or closed to control the indoor unit to switch the operation mode, including:
and controlling the first electronic valve to be switched from open to closed and controlling the second electronic valve to be opened so as to switch the operation mode of the indoor unit from the cooling mode to the heating mode.
The embodiment of the invention provides an air conditioning system, which comprises a control device, an indoor unit and an electronic expansion valve, wherein the indoor unit comprises an indoor fan, the control device is used for judging whether a control instruction for switching an operation mode of the indoor unit is received, and executing a first switching action under the condition of receiving the control instruction for switching the operation mode of the indoor unit, and the first switching action comprises the steps of controlling the indoor fan to be closed or to be operated at a preset gear and controlling the electronic expansion valve to be adjusted to a preset opening degree.
In the air conditioning system according to the above embodiment, under the condition that a control instruction for switching the operation mode of the indoor unit is received, the indoor fan is controlled to be closed or the indoor fan is operated at a preset gear and the electronic expansion valve is controlled to be adjusted to a preset opening degree, which is beneficial to weakening the condensation effect of the refrigerant in the indoor unit, so that the amount of the liquid refrigerant in the indoor unit is reduced, on one hand, the time for pressure equalization through the indoor heat exchanger and the environment heat exchange can be shortened, the pressure of the indoor unit side can reach the pressure value under the limitation of the environment temperature more quickly, on the other hand, the time for pressure equalization after switching can be shortened, and the impact force of the refrigerant can be reduced, and.
In some embodiments, the operation mode includes a heating mode and a cooling mode, the control instruction is that the indoor unit is switched from the heating mode to the cooling mode, and the control device is configured to determine whether the air conditioning system satisfies a first condition when performing the first switching operation, and perform a second switching operation when the air conditioning system satisfies the first condition when performing the first switching operation; the second switching action comprises controlling the indoor fan to be opened and controlling the electronic expansion valve to be closed, and the first condition comprises one of the following conditions: controlling the indoor fan to be closed or to run at the preset gear and controlling the electronic expansion valve to adjust the time length of the preset opening degree to last for a first preset time length; under the condition that the indoor unit is in the heating mode, the supercooling degree of the indoor unit is smaller than a preset supercooling degree; and the effusion coefficient of the indoor unit is smaller than a preset value.
In some embodiments, the indoor unit includes an indoor heat exchanger, the control device is configured to determine whether the air conditioning system satisfies a second condition when performing the second switching operation, and control the indoor unit to switch from the heating mode to the cooling mode when the air conditioning system satisfies the second condition when performing the second switching operation, where the second condition includes one of: controlling the indoor fan to be opened and controlling the closing time of the electronic expansion valve to last for a second preset time; the temperature of the indoor heat exchanger is less than or equal to a preset temperature; the absolute value of the difference between the temperature of the indoor heat exchanger and the ambient temperature is within a preset range; the pressure of the indoor heat exchanger is less than or equal to a preset pressure.
In some embodiments, the air conditioning system includes a control valve, and the control device is configured to control the control valve to open or close to control the indoor unit to switch the operation mode.
In some embodiments, the control valve includes an electronic valve, the indoor unit includes an indoor heat exchanger, the electronic valve is connected to the indoor heat exchanger, the operation mode includes a heating mode and a cooling mode, and the control device is configured to control the electronic valve to be switched from off to on so as to switch the operation mode of the indoor unit from the heating mode to the cooling mode.
In some embodiments, the control valve includes a first electronic valve and a second electronic valve, the indoor unit includes an indoor heat exchanger, the first electronic valve and the second electronic valve are connected to the indoor heat exchanger, the operation mode includes a cooling mode and a heating mode, and the control device is configured to control the first electronic valve to be switched from on to off and control the second electronic valve to be opened so as to switch the operation mode of the indoor unit from the cooling mode to the heating mode.
An embodiment of the present invention provides an air conditioning system, which includes an indoor unit, a processor, and a memory, where the memory stores a mode switching control program, and the mode switching control program is executed by the processor to implement the mode switching control method according to any one of the embodiments.
In the air conditioning system according to the above embodiment, when a control instruction for switching the operation mode of the indoor unit is received, the indoor fan is controlled to be turned off or the indoor unit is operated at a preset gear and the electronic expansion valve is controlled to adjust to a preset opening degree, which is beneficial to weakening the condensation effect of the indoor unit on the refrigerant, so that the amount of the liquid refrigerant in the indoor unit is reduced, on one hand, the time for pressure equalization through the indoor heat exchanger and the ambient heat exchange can be shortened, the pressure of the indoor unit can reach the pressure value under the ambient temperature limit more quickly, on the other hand, the time for pressure equalization after switching can be shortened, and the impact force of the refrigerant can be shortened, and finally, the effects of.
Additional aspects and advantages of embodiments of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a mode switching control method according to an embodiment of the present invention.
Fig. 2 is a block schematic diagram of an air conditioning system according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of an air conditioning system according to an embodiment of the present invention.
Fig. 4 is another flowchart of a mode switching control method according to an embodiment of the present invention.
Fig. 5 is a schematic view of the temperature distribution of the indoor unit according to the embodiment of the present invention.
Fig. 6 is still another flowchart of the mode switching control method according to the embodiment of the present invention.
Fig. 7 is another schematic configuration diagram of an air conditioning system according to an embodiment of the present invention.
Fig. 8 is another block schematic diagram of an air conditioning system according to an embodiment of the present invention.
Description of the main element symbols:
the air conditioning system 10, the compressor 11, the outdoor unit 12, the control device 13, the indoor unit 14, the indoor fan 142, the indoor heat exchanger 144, the oil return device 15, the control valve 16, the first electronic valve 162, the second electronic valve 164, the four-way valve 17, the processor 18, the memory 19, the electronic expansion valve 20, the low-pressure tank 21, and the outdoor heat exchanger 22.
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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Referring to fig. 1 to 3, an air conditioning system 10 according to an embodiment of the present invention includes a control device 13, an indoor unit 14, and an electronic expansion valve 20, where the indoor unit 14 includes an indoor fan 142 and an indoor heat exchanger 144. The mode switching control method according to the embodiment of the present invention may be applied to the air conditioning system 10 according to the embodiment of the present invention. The mode switching control method of the embodiment of the invention comprises the following steps:
step S10, determining whether a control command for switching the operation mode of the indoor unit 14 is received;
in step S20, when a control command for switching the operation mode of the indoor unit 14 is received, a first switching operation is executed.
The mode switching control method according to the embodiment of the present invention can be realized by the air conditioning system 10 according to the embodiment. When the mode switching control method is applied to the air conditioning system 10, the steps S10 and S20 may be implemented by the control device 13. That is, the control device 13 determines whether or not a control command for switching the operation mode of the indoor unit 14 is received, and executes the first switching operation when a control command for switching the operation mode of the indoor unit 14 is received. Wherein the first switching action includes controlling the indoor fan 142 to be turned off or to be operated at a preset gear, and controlling the electronic expansion valve 20 to be adjusted to a preset opening degree.
In the mode switching control method and the air conditioning system 10 of the above embodiment, under the condition of receiving the control instruction for switching the operation mode of the indoor unit 14, the indoor fan 142 is controlled to be turned off or operated at the preset gear and the electronic expansion valve 20 is controlled to be adjusted to the preset opening, which is beneficial to reducing the condensation effect of the refrigerant in the indoor unit 14, so that the amount of the liquid refrigerant in the indoor unit 14 is reduced, on one hand, the time for pressure equalization between the indoor heat exchanger 144 and the environment can be shortened, so that the pressure of the indoor unit 14 can reach the pressure value under the environmental temperature limit more quickly, on the other hand, the time for pressure equalization after switching and the impact force of the refrigerant can be shortened, and finally, the effect of reducing the noise value in.
Specifically, the air conditioning system 10 is a multi-split air conditioning system, the air conditioning system 10 includes one or more outdoor units 12, and the number of the outdoor units 12 is 2 in the example of fig. 3. The multi-split air conditioning system may be a heat recovery system, may realize cooling and heating requirements for a plurality of indoor units 14 through 2 outdoor units 12, and may be applied to different environments, such as large-scale venues, machine rooms, and office places. The air conditioning system 10 includes a refrigerant distributor. The refrigerant distributor is used for distributing the amount of refrigerant in the air conditioning system 10.
In certain embodiments, the operating modes of the air conditioning system 10 include a cooling mode, a heating mode, an oil return mode, and a defrost mode.
Referring to fig. 3, the air conditioning system 10 includes an oil return device 15, a compressor 11, and a low pressure tank 21, and the low pressure tank 21 is connected to the outdoor unit 12, the indoor unit 14, and the compressor 11. The oil return device 15 is connected to the compressor 11.
The low-pressure tank 21 is beneficial to ensuring stable return air pressure of the air conditioning system 10, and can store liquid refrigerant, so that the liquid refrigerant is prevented from impacting the compressor 11, and the reliability of the air conditioning system 10 is improved.
The oil return device 15 is used for separating the lubricating oil discharged from the compressor 11 along with the refrigerant gas and providing the separated lubricating oil to the compressor 11, so as to prevent the compressor 11 from being damaged due to oil shortage. However, the oil return device 15 cannot completely separate the lubricating oil in the refrigerant gas, and a small amount of lubricating oil still enters the condenser, the evaporator and the corresponding pipelines along with the refrigerant, and for the multi-split air conditioning system 10, because the system pipelines are long, the fall is large, and the number of elbows is large, the system has more oil storage places, and when the multi-split air conditioning system 10 runs for a long time, the compressor 11 is easy to lack oil.
The air conditioning system 10 needs to be switched to the oil return mode when the amount of lubricant oil of the compressor 11 is small or to the oil return mode every predetermined time period to recover the lubricant oil remaining in the condenser, the evaporator and the corresponding piping. Therefore, when the air conditioning system 10 is switched to the oil return mode, if the current operation mode of the indoor unit 14 is the heating mode, the operation mode of the indoor unit 14 generally needs to be switched from the heating mode to the cooling mode.
In addition, when the air conditioning system 10 operates in the heating mode in a low-temperature environment, the refrigerant absorbs heat in the outdoor unit 12, so that the temperature of the outdoor unit 12 is further lowered, which easily causes frost condensation in the outdoor unit 12 and affects the operation of the air conditioning system 10. Therefore, the air conditioning system 10 needs to switch to the defrosting mode when the temperature of the outdoor unit 12 is low, or switch to the defrosting mode at preset intervals, so as to defrost the outdoor unit 12 and ensure the normal operation of the air conditioning system 10. Similarly, when the air conditioning system 10 is switched to the defrosting mode, if the current operation mode of the indoor unit 14 is the heating mode, the operation mode of the indoor unit 14 generally needs to be switched from the heating mode to the cooling mode.
Specifically, controlling the indoor fan 142 to be turned off or to be operated at a preset gear and controlling the electronic expansion valve 20 to be adjusted to a preset opening degree includes controlling the indoor fan 142 to be turned off and controlling the electronic expansion valve 20 to be adjusted to a preset opening degree, or controlling the indoor fan 142 to be operated at a preset gear and controlling the electronic expansion valve 20 to be adjusted to a preset opening degree.
The indoor fan 142 is operated in a preset gear and in one embodiment, the indoor fan 142 is operated in a lowest damper. Controlling the electronic expansion valve 20 to adjust to the preset opening degree in one embodiment, the electronic expansion valve 20 is controlled to adjust to 70% or more of the maximum opening degree. It is to be understood that, in other embodiments, the preset gear may be another gear lower than the gear of the indoor fan 142 before receiving the control command to switch the operation mode.
When the indoor unit 14 is in the heating mode, a large amount of liquid refrigerant exists in the indoor unit 14, and the more the liquid refrigerant is under the same pressure, the larger the heat capacity is, the larger the amount of heat transfer required for pressure reduction is, so that the time required for pressure reduction of the indoor unit 14 is longer, and the noise is larger when the operation mode is switched.
Therefore, in the present embodiment, when a control command for switching the operation mode of the indoor unit 14 is received, the indoor fan 142 is controlled to be turned off or operated at the lowest gear and the electronic expansion valve 20 is controlled to be adjusted to a preset opening degree, since the indoor fan 142 is turned off or operated at the lowest gear, the condensing rate of the refrigerant in the indoor unit 14 can be reduced, in addition, by controlling the electronic expansion valve 20 to adjust to a large opening degree, the content ratio of the gaseous refrigerant in the indoor unit 14 can be increased, that is, in the present embodiment, before the mode of the air conditioning system 10 is switched, the liquid refrigerant in the indoor unit 14 (for example, in the indoor heat exchanger 144 and/or in the refrigerant pipeline of the indoor unit 14) is mostly drained as much as possible, and the corresponding gaseous refrigerant under the same pressure remains, and at this time, the heat capacity of the refrigerant in the indoor unit 14 is small, so that the heat can be transferred to the outside and the pressure of the indoor unit 14 can be reduced more quickly. Therefore, on one hand, the time for pressure equalization between the indoor heat exchanger 144 and the environment heat exchange can be shortened, so that the pressure of the indoor unit 14 can reach the pressure value under the limit of the environment temperature more quickly, on the other hand, the time for pressure equalization after switching and the impact force of the refrigerant can be shortened, and finally, the effects of reducing noise and duration time of the noise and the impact force of the refrigerant can be achieved.
Referring to fig. 4, in some embodiments, the control command is to switch the indoor unit 14 from the heating mode to the cooling mode, and the mode switching control method includes:
step S30, determining whether the air conditioning system 10 satisfies a first condition when performing the first switching action;
if the air conditioning system 10 satisfies the first condition while executing the first switching operation, the second switching operation is executed in step S40.
The mode switching control method of the above embodiment can be realized by the air conditioning system 10 of the present embodiment. Both of step S30 and step S40 may be implemented by the control device 13. That is, the control device 13 is configured to determine whether the air conditioning system 10 satisfies the first condition when the first switching operation is performed, and to perform the second switching operation when the air conditioning system 10 satisfies the first condition when the first switching operation is performed.
Wherein the second switching action comprises controlling the indoor fan 142 to be opened and controlling the electronic expansion valve 20 to be closed. The first condition includes one of the following conditions: controlling the indoor fan 142 to be closed or operated at a preset gear and controlling the electronic expansion valve 20 to be adjusted to a preset opening degree for a first preset duration; under the condition that the indoor unit 14 is in the heating mode, the supercooling degree of the indoor unit 14 is smaller than the preset supercooling degree; the effusion coefficient of the indoor unit 14 is less than a preset value.
In this way, the second switching operation is executed only when the first switching operation is executed by the air conditioning system 10 and the first condition is satisfied, so that the liquid refrigerant of the indoor unit 14 can be reduced as much as possible, the time for equalizing the pressure after the mode switching can be shortened, the impact force of the refrigerant can be reduced, and finally, the effects of reducing the noise and the duration time can be achieved.
When the indoor unit 14 is in the heating mode, the indoor heat exchanger 144 of the indoor unit 14 is a condenser. When the indoor unit 14 is in the cooling mode, the indoor heat exchanger 144 of the indoor unit 14 is an evaporator. Specifically, referring to fig. 5, when the indoor unit 14 is in the heating mode, T2B is the liquid pipe temperature of the indoor unit 14, T2A is the liquid pipe temperature of the indoor unit 14, T2 is the middle temperature of the indoor heat exchanger 144, T1 is the intake air temperature of the indoor unit 14, and T3 is the condensation temperature. The pressure of the indoor unit 12 may be detected by a pressure sensor of the indoor unit 12, and the saturation temperature calculated according to the detected pressure is the condensation temperature. In one embodiment, the degree of subcooling SC may be expressed as: and SC-T2A-T2, i.e., the difference between the liquid pipe temperature T2A of the indoor unit 14 and the middle temperature T2 of the indoor heat exchanger 144. In another embodiment, the degree of supercooling SC may represent: SC-T2A-T3.
In addition, in one embodiment, the effusion coefficient JY of the indoor unit 14 can be expressed as: JY ═ (T2-T2B)/(T2-T1). In another embodiment, the effusion coefficient JY of the indoor unit 14 can be expressed as: JY ═ (T3-T2B)/(T3-T1).
It should be noted that, in one embodiment, the second switching action is performed after the indoor fan 142 is turned off or operated at a preset gear and the electronic expansion valve 20 is controlled to be adjusted to a preset opening degree for a first preset time. In one example, the first predetermined period of time may be selected within a range of [3,5] minutes.
In another embodiment, after the indoor fan 142 is controlled to be turned off or operated at a preset gear and the electronic expansion valve 20 is controlled to adjust to a preset opening degree, the second switching operation is performed when the supercooling degree of the indoor unit 14 is detected to be less than the first preset value. In one example, the predetermined subcooling temperature may be selected from the range of [1.5,2.2], preferably 2 degrees.
In another embodiment, after the indoor fan 142 is controlled to be turned off or operated at a preset gear and the electronic expansion valve 20 is controlled to adjust to a preset opening degree, the second switching action is performed if the liquid loading factor of the indoor unit 14 is detected to be smaller than a preset value. In one example, the preset value may be selected within a range of 0.08,0.12, preferably 0.1.
Referring to fig. 6, in some embodiments, a method for controlling mode switching includes:
step S50, determining whether the air conditioning system 10 satisfies a second condition when executing the second switching operation;
when the second switching operation is performed and the second condition is satisfied in the air conditioning system 10, step S60 controls the indoor unit 14 to switch from the heating mode to the cooling mode.
The mode switching control method of the above embodiment can be realized by the air conditioning system 10 of the present embodiment. Both of step S50 and step S60 may be implemented by the control device 13. That is, the control device 13 is configured to determine whether the air conditioning system 10 satisfies the second condition when the second switching action is performed; when the second switching operation is performed and the second condition is satisfied in the air conditioning system 10, the indoor unit 14 is controlled to be switched from the heating mode to the cooling mode.
Wherein the second condition comprises one of the following conditions: controlling the time length for opening the indoor fan 142 and closing the electronic expansion valve 20 to last for a second preset time length; the temperature of the indoor heat exchanger 144 is less than or equal to a preset temperature; the absolute value of the difference between the temperature of the indoor heat exchanger 144 and the ambient temperature is within a preset range; the pressure of the indoor heat exchanger 144 is less than or equal to a preset pressure. In one embodiment, the selectable range for the second preset length of time is [3,5] minutes.
In this way, by performing the mode switching again when the second condition is satisfied when the air conditioning system 10 performs the second switching operation, the liquid refrigerant in the indoor unit 14 is substantially drained, and the time for equalizing the pressure after the mode switching and the noise reduction can be reduced.
In the case where the air conditioning system 10 satisfies the first condition while performing the first switching operation, the gear of the indoor fan 142 may be any damper by turning on the indoor fan 142 in the present embodiment, and at this time, the indoor unit 14 starts to condense. This isolates the pressure transmission of the indoor unit 14 from the outside, due to the closing of the electronic expansion valve 20. As the indoor unit 14 starts to condense, the temperature of the indoor heat exchanger 144 gradually decreases, and the pressure of the indoor heat exchanger 144 also gradually decreases. In one embodiment, when the temperature of the indoor heat exchanger 144 is less than or equal to the preset temperature, the indoor unit 14 is controlled to switch from the heating mode to the cooling mode. In another embodiment, the indoor unit 14 is controlled to switch from the heating mode to the cooling mode when the absolute value of the difference between the temperature of the indoor heat exchanger 144 and the ambient temperature is within a preset range. In another embodiment, when the pressure of the indoor heat exchanger 144 is less than or equal to the preset pressure, the indoor unit 14 is controlled to switch from the heating mode to the cooling mode.
In some embodiments, the air conditioning system 10 includes a control valve 16, and the method of controlling the mode switching includes:
the control valve 16 is controlled to open or close to control the indoor unit 14 to switch the operation mode.
The mode switching control method according to the above embodiment can be realized by the control device 13 according to the present embodiment. That is, the control device 13 is used to control the control valve 16 to open or close to control the indoor unit 14 to switch the operation mode.
In this way, the air conditioning system 10 can control the operation mode of the indoor unit 14 by controlling the flow direction of the refrigerant by the control valve 16, so that the air conditioning system 10 can perform various functions such as cooling, heating, oil return, defrosting, and the like.
Referring to fig. 2 and 3, in some embodiments, the air conditioning system 10 includes a four-way valve 17, and the four-way valve 17 connects the compressor 11, the indoor unit 14, and the outdoor unit 12. The control device 13 may control a flow direction of the refrigerant discharged from the compressor 11 by the four-way valve 17 to implement different functions of the air conditioning system 10.
Referring to fig. 3, in another example, the control device 13 may control the high-pressure refrigerant discharged from the compressor 11 to flow to the indoor unit 14 for heat dissipation and condensation through the four-way valve 17, so as to achieve heating of the indoor unit 14, then the refrigerant flows to the outdoor unit 12 for evaporation and heat absorption, and finally the low-pressure refrigerant returns to the compressor 11 to form a circulation loop.
Referring to fig. 7 again, in an example, the control device 13 may control the high-pressure refrigerant discharged from the compressor 11 to flow to the outdoor unit 12 for heat dissipation and condensation through the four-way valve 17, and then flow to the indoor unit 14 for evaporation and heat absorption, so as to cool the indoor unit 14, and finally the low-pressure refrigerant returns to the compressor 11 to form a circulation loop.
In some embodiments, the control valve 16 includes a first electrovalve 162 and a second electrovalve 164 connected to the indoor unit 14. When the indoor unit 14 is in the cooling mode, the first electronic valve 162 may be opened such that the low-pressure refrigerant flowing out of the indoor unit 14 may return to the low-pressure tank 21 through the first electronic valve 162 and then return to the compressor 11. When the indoor unit 14 is in the heating mode, the second electronic valve 164 may be opened such that the high-pressure refrigerant discharged from the compressor 11 may enter the indoor unit 14 through the second electronic valve 164.
Specifically, the first electronic valve 162 and the second electronic valve 164 may be conducted only in one direction, and may not be conducted in the reverse direction. And the control device 13 may control the first electronic valve 162 and the second electronic valve 164 to be opened so that the first electronic valve 162 and the second electronic valve 164 may be conducted in the forward direction, and control the first electronic valve 162 and the second electronic valve 164 to be closed so that the first electronic valve 162 and the second electronic valve 164 may not be conducted in the forward direction. The direction a of the refrigerant flowing out of the indoor unit 14 through the first electronic valve 162 is the forward direction of the first electronic valve 162, and the direction B of the refrigerant flowing into the indoor unit 14 through the second electronic valve 164 is the forward direction of the second electronic valve 164.
Further, the first electronic valve 162 and the second electronic valve 164 are connected to the same end of the indoor heat exchanger 144, so that when the indoor unit 14 is in the heating mode, the second electronic valve 164 is opened, and the first electronic valve 162 is closed, thereby preventing the refrigerant flowing through the second electronic valve 164 from directly returning to the compressor 11 from the first electronic valve 162.
In some embodiments, the number of the first electronic valves 162 and the second electronic valves 164 is multiple, and the multiple first electronic valves 162, the multiple second electronic valves 164 and the multiple indoor units 14 correspond to one another.
In some embodiments, the first electronic valve 162 and/or the second electronic valve 164 may be solenoid valves, and thus, the control device 13 may control the opening or closing of the first electronic valve 162 and/or the second electronic valve 164 through electric signals.
In some embodiments, the step of controlling the control valve 16 to open or close to control the indoor unit 14 to switch the operation mode includes: the first electronic valve 162 is controlled to be switched from off to on to switch the operation mode of the indoor unit 14 from the heating mode to the cooling mode.
For the indoor unit 14, the control device 13 may be configured to control the first electronic valve 162 to be switched from closed to open so as to switch the operation mode of the indoor unit 14 from the heating mode to the cooling mode.
It is understood that when the indoor unit 14 is in the heating mode, the first electronic valve 162 is closed, and the second electronic valve 164 is opened. When the indoor unit 14 is in the cooling mode, the first electronic valve 162 is opened, and the second electronic valve 164 may be opened or closed. Therefore, when the operation mode of the indoor unit 14 is switched from the heating mode to the cooling mode, the first electronic valve 162 may be switched from off to on. After switching, second electronic valve 164 may remain open or switch from open to closed because second electronic valve 164 cannot conduct in reverse.
In some embodiments, the step of controlling the control valve 16 to open or close to control the indoor unit 14 to switch the operation mode includes: the first electronic valve 162 is controlled to be switched from open to closed, and the second electronic valve 164 is controlled to be opened to switch the operation mode of the indoor unit 14 from the cooling mode to the heating mode.
For the air conditioning system 10, the control device 13 may be configured to control the first electronic valve 162 to be switched from open to closed, and control the second electronic valve 164 to be opened so as to switch the operation mode of the indoor unit 14 from the cooling mode to the heating mode. Accordingly, when the operation mode of the indoor unit 14 is switched from the cooling mode to the heating mode, the second electronic valve 164 may be controlled to be kept open or switched from closed to open by switching the first electronic valve 162 from open to closed.
Generally, when the external environment is low and the indoor unit 14 operates in the heating mode, the defrosting problem of the air conditioning system 10 needs to be considered, in order to remove the frost from the outdoor unit 12, the heat release of the refrigerant in the outdoor unit 12 can be controlled, and the defrosting mode can be similar to the cooling mode of the indoor unit 14, that is, when the air conditioning system 10 is switched to the defrosting mode, the switching manner of the indoor unit 14 can be similar to the switching manner of the indoor unit 14 from the heating mode to the cooling mode.
Referring to fig. 8, an air conditioning system 10 according to an embodiment of the present invention includes an indoor unit 14, a processor 18, and a memory 19, where the memory 19 stores a mode switching control program, and the mode switching control program is executed by the processor 18 to implement the mode switching control method according to any one of the embodiments.
In one embodiment, the mode switching control program is executed by the processor 18 to implement the steps of:
s10, determining whether a control command for switching the operation mode of the indoor unit 14 is received;
s20, when a control command for switching the operation mode of the indoor unit 14 is received, a first switching operation is performed, the first switching operation includes controlling the indoor fan 142 to be turned off or to be operated at a preset gear and controlling the electronic expansion valve 20 to be adjusted to a preset opening degree.
In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like 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, schematic representations of the above terms do not necessarily 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.
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 specific logical functions or steps of the 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, such as 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, processing module-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 having one or more wires (control method), 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 embodiments 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. For example, 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 not to be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A mode switching control method is used for an air conditioning system, the air conditioning system comprises a refrigerant distributor, an indoor unit and an electronic expansion valve, the indoor unit comprises an indoor fan, and the mode switching control method is characterized by comprising the following steps:
judging whether a control instruction for switching the operation mode of the indoor unit is received;
under the condition that a control instruction of switching an operation mode of the indoor unit is received, executing a first switching action, wherein the first switching action comprises controlling the indoor fan to be closed or to be operated at a preset gear and controlling the electronic expansion valve to be adjusted to a preset opening degree;
the operation mode comprises a heating mode and a cooling mode, the control instruction is that the indoor unit is switched from the heating mode to the cooling mode, and the mode switching control method comprises the following steps: judging whether the air conditioning system meets a first condition under the condition of executing the first switching action; executing a second switching action when the air conditioning system meets the first condition when executing the first switching action; the second switching action comprises controlling the indoor fan to be opened and controlling the electronic expansion valve to be closed.
2. The method of controlling mode switching according to claim 1,
the first condition comprises one of the following conditions:
controlling the indoor fan to be closed or to run at the preset gear and controlling the electronic expansion valve to adjust the time length of the preset opening degree to last for a first preset time length;
under the condition that the indoor unit is in the heating mode, the supercooling degree of the indoor unit is smaller than a preset supercooling degree;
and the effusion coefficient of the indoor unit is smaller than a preset value.
3. The mode switching control method of claim 2, wherein the indoor unit includes an indoor heat exchanger, and the mode switching control method includes:
judging whether the air conditioning system meets a second condition under the condition of executing the second switching action;
when the air conditioning system meets the second condition under the condition that the second switching action is executed, controlling the indoor unit to be switched from the heating mode to the cooling mode;
the second condition includes one of the following conditions:
controlling the indoor fan to be opened and controlling the closing time of the electronic expansion valve to last for a second preset time;
the temperature of the indoor heat exchanger is less than or equal to a preset temperature;
the absolute value of the difference between the temperature of the indoor heat exchanger and the ambient temperature is within a preset range;
the pressure of the indoor heat exchanger is less than or equal to a preset pressure.
4. The method of claim 1, wherein the air conditioning system includes a control valve, and the method of controlling mode switching comprises:
and controlling the control valve to open or close to control the indoor unit to switch the running mode.
5. The method of claim 4, wherein the control valve comprises an electronic valve, the indoor unit comprises an indoor heat exchanger, the electronic valve is connected with the indoor heat exchanger, the operation mode comprises a heating mode and a cooling mode, and the controlling of the control valve to open or close to control the indoor unit to switch the operation mode comprises:
and controlling the electronic valve to be switched from closed to open so as to switch the operation mode of the indoor unit from the heating mode to the cooling mode.
6. The mode switching control method according to claim 4, wherein the control valve includes a first electronic valve and a second electronic valve, the indoor unit includes an indoor heat exchanger, the first electronic valve and the second electronic valve are connected to the indoor heat exchanger, the operation mode includes a cooling mode and a heating mode, and the control valve is controlled to be opened or closed to control the indoor unit to switch the operation mode includes:
and controlling the first electronic valve to be switched from open to closed and controlling the second electronic valve to be opened so as to switch the operation mode of the indoor unit from the cooling mode to the heating mode.
7. An air conditioning system is characterized by comprising a control device, an indoor unit and an electronic expansion valve, wherein the indoor unit comprises an indoor fan, and the control device is used for judging whether a control instruction for switching an operation mode of the indoor unit is received or not, and executing a first switching action under the condition that the control instruction for switching the operation mode of the indoor unit is received, wherein the first switching action comprises the steps of controlling the indoor fan to be closed or to be operated at a preset gear and controlling the electronic expansion valve to be adjusted to a preset opening degree;
the control device is used for judging whether the air conditioning system meets a first condition under the condition of executing the first switching action, and executing a second switching action under the condition that the air conditioning system meets the first condition under the condition of executing the first switching action; the second switching action comprises controlling the indoor fan to be opened and controlling the electronic expansion valve to be closed.
8. The air conditioning system of claim 7, wherein the first condition comprises one of: controlling the indoor fan to be closed or to run at the preset gear and controlling the electronic expansion valve to adjust the time length of the preset opening degree to last for a first preset time length; under the condition that the indoor unit is in the heating mode, the supercooling degree of the indoor unit is smaller than a preset supercooling degree; and the effusion coefficient of the indoor unit is smaller than a preset value.
9. The air conditioning system of claim 8, wherein the indoor unit includes an indoor heat exchanger, the control device is configured to determine whether a second condition is satisfied by the air conditioning system when the second switching action is performed, and to control the indoor unit to switch from the heating mode to the cooling mode when the second condition is satisfied by the air conditioning system when the second switching action is performed, and the second condition includes one of: controlling the indoor fan to be opened and controlling the closing time of the electronic expansion valve to last for a second preset time; the temperature of the indoor heat exchanger is less than or equal to a preset temperature; the absolute value of the difference between the temperature of the indoor heat exchanger and the ambient temperature is within a preset range; the pressure of the indoor heat exchanger is less than or equal to a preset pressure.
10. The air conditioning system as claimed in claim 7, wherein the air conditioning system includes a control valve, and the control device is configured to control the control valve to open or close to control the indoor unit to switch the operation mode.
11. The air conditioning system as claimed in claim 10, wherein the control valve comprises an electronic valve, the indoor unit comprises an indoor heat exchanger, the electronic valve is connected to the indoor heat exchanger, the operation mode comprises a heating mode and a cooling mode, and the control device is configured to control the electronic valve to be switched from off to on to switch the operation mode of the indoor unit from the heating mode to the cooling mode.
12. The air conditioning system as claimed in claim 10, wherein the control valve includes a first electronic valve and a second electronic valve, the indoor unit includes an indoor heat exchanger, the first electronic valve and the second electronic valve are connected to the indoor heat exchanger, the operation mode includes a cooling mode and a heating mode, and the control device is configured to control the first electronic valve to be switched from on to off and control the second electronic valve to be opened so that the operation mode of the indoor unit is switched from the cooling mode to the heating mode.
13. An air conditioning system comprising an indoor unit, a processor, and a memory, wherein the memory stores a mode switching control program, and the mode switching control program is executed by the processor to implement the mode switching control method according to any one of claims 1 to 6.
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| CN111121243B (en) * | 2019-12-27 | 2021-04-27 | 海信（山东）空调有限公司 | Control method and device for air conditioner mute, storage medium and air conditioner |
| CN111237982B (en) * | 2020-01-14 | 2021-11-05 | 广东美的暖通设备有限公司 | Air conditioner, control method and device thereof, electronic equipment and storage medium |
| CN111412636B (en) * | 2020-04-07 | 2021-05-25 | 珠海格力电器股份有限公司 | Air conditioner without communication circuit between indoor unit and outdoor unit and control method thereof |
| CN112797520B (en) * | 2020-12-31 | 2023-12-08 | 青岛海信日立空调系统有限公司 | Air conditioner and AHU unit temperature control method |
| CN113108419B (en) * | 2021-03-15 | 2022-06-17 | 珠海格力电器股份有限公司 | Control method of multi-split air conditioning system |
| CN113606739B (en) * | 2021-08-20 | 2022-08-12 | 宁波奥克斯电气股份有限公司 | Control method and device for air conditioner shutdown differential pressure balance and multi-split air conditioner |
| CN114216230B (en) * | 2021-11-30 | 2023-05-16 | 青岛海尔空调器有限总公司 | Method and device for controlling air conditioner, air conditioner and storage medium |
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| CN103062846B (en) * | 2013-01-11 | 2015-06-17 | 四川长虹电器股份有限公司 | Outdoor air conditioning unit, integrated air conditioning control system and starting method thereof |
| CN104748432B (en) * | 2015-03-31 | 2017-05-03 | 广东美的暖通设备有限公司 | multiple on-line system |
| US10088178B2 (en) * | 2015-05-05 | 2018-10-02 | MJC, Inc. | Multi-zone variable refrigerant flow heating/cooling unit |
| CN105737335B (en) * | 2016-02-22 | 2018-09-07 | 广东美的暖通设备有限公司 | Multi-line system and its mode switch control method |
| CN105864984B (en) * | 2016-04-27 | 2018-10-19 | 广东美的暖通设备有限公司 | Electronic expansion valve of indoor unit adjusting method and device |
| CN106403346A (en) * | 2016-11-16 | 2017-02-15 | 珠海格力电器股份有限公司 | Refrigerant distributor and two-pipe heating recycling multi-split system |
| CN107504640A (en) * | 2017-08-21 | 2017-12-22 | 广东美的制冷设备有限公司 | Air-conditioning system, air conditioner and refrigerant recovering control method |
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