CN113566384B - Control method for preventing indoor machine of air conditioner from condensation and storage medium - Google Patents
Control method for preventing indoor machine of air conditioner from condensation and storage medium Download PDFInfo
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- CN113566384B CN113566384B CN202110844241.4A CN202110844241A CN113566384B CN 113566384 B CN113566384 B CN 113566384B CN 202110844241 A CN202110844241 A CN 202110844241A CN 113566384 B CN113566384 B CN 113566384B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioners, and particularly provides a control method for preventing condensation of an indoor unit in an air conditioner. The invention aims to solve the problem that the air conditioner in the prior art is difficult to achieve the purposes of preventing condensation and ensuring the refrigeration or dehumidification effect in a short time. For the purpose, when the running first indoor unit has a condensation risk, the invention can firstly keep the current opening degree of the electronic expansion valve of the first indoor unit and only adjust the opening degree of the electronic expansion valve of the second indoor unit until the condensation risk of the first indoor unit is eliminated; then, when the condensation risk of the first indoor unit is eliminated, closing an electronic expansion valve of the second indoor unit; and meanwhile, the electronic expansion valve of the first indoor unit is increased with a compensation opening degree on the basis of the current opening degree. The method can realize the purposes of preventing the first indoor unit from generating condensation in time and ensuring the refrigeration or dehumidification effect of the first indoor unit.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a control method for preventing condensation of an indoor unit in an air conditioner and a storage medium.
Background
The split air conditioner has several indoor units for several rooms and one outdoor unit shared by several indoor units. When the indoor unit operates in a cooling mode or a dehumidifying mode, an indoor heat exchanger in the indoor unit has the function of an evaporator, an indoor fan drives indoor air to enter the indoor unit, and the indoor heat exchanger absorbs heat of the indoor air and then blows cold air to the indoor space. The cold air blown out by the indoor unit and the indoor hot air are intersected at the air outlet of the indoor unit, and if the air outlet temperature of the indoor unit is lower than the dew point temperature of the indoor environment at the moment, moisture in the indoor hot air can form condensation at the panel, the air outlet and the like of the indoor unit and drip on the ground, so that the use experience of a user is influenced.
In an existing control method for preventing condensation of an indoor unit in an air conditioner, when a risk of condensation of the indoor unit is detected, the outlet air temperature is generally increased by increasing the opening degree of an electronic expansion valve of the indoor unit.
However, it is difficult to determine an accurate opening degree of an electronic expansion valve of an indoor unit of an air conditioner, so that the air conditioner can achieve the purposes of preventing a condensation phenomenon and ensuring a cooling or dehumidifying effect in a short time.
Accordingly, there is a need in the art for a new control method for preventing condensation in an indoor unit of an air conditioner to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to solve the technical problems, namely, the air conditioner in the prior art is difficult to achieve the purposes of preventing condensation phenomenon and ensuring the refrigeration or dehumidification effect in a short time by adjusting the opening degree of an electronic expansion valve of an indoor unit in the air conditioner.
In a first aspect, the present invention provides a method for controlling condensation prevention of indoor units in an air conditioner, wherein a plurality of indoor units are connected to an outdoor unit of the air conditioner, the method comprising: when the running first indoor unit has a condensation risk, searching a second indoor unit in a shutdown state; keeping the current opening degree of the electronic expansion valve of the first indoor unit, and adjusting the opening degree of the electronic expansion valve of the second indoor unit until the condensation risk of the first indoor unit is eliminated; when the condensation risk of the first indoor unit is eliminated, closing an electronic expansion valve of the second indoor unit; and meanwhile, the electronic expansion valve of the first indoor unit is increased with a compensation opening degree on the basis of the current opening degree.
As a preferable technical solution of the control method provided by the present invention, before "searching for the second indoor unit in the shutdown state", the method further includes: when the first indoor unit is in a refrigeration mode or a dehumidification mode, the air outlet temperature T of the first indoor unit is obtainedidAnd the indoor ambient temperature T of the first indoor unitihAnd indoor ambient humidity Tiw(ii) a Determining the indoor ambient temperature TihAnd indoor ambient humidity TiwCorresponding dew point temperature T of indoor environmentd(ii) a Will the air-out temperature TidAnd the dew point temperature TdCarrying out comparison; when the outlet air temperature T is higheridLess than the dew point temperature TdAnd if so, determining that the first indoor unit has a condensation risk.
As a preferable aspect of the control method according to the present invention, the step of "searching for the second indoor unit in the stopped state" includes: searching an indoor unit which is nearest to the first indoor unit and is in a shutdown state, and determining the indoor unit as a second indoor unit; or searching all the indoor units in the shutdown state, and determining one of the indoor units as the second indoor unit.
As a preferable aspect of the control method according to the present invention, the step of "adjusting the opening degree of the electronic expansion valve of the second indoor unit until the risk of condensation in the first indoor unit is eliminated" includes: and adjusting the electronic expansion valve of the second indoor unit to a first set opening degree.
As a preferable aspect of the control method according to the present invention, "adjusting the electronic expansion valve of the second indoor unit to a first set opening degree" further includes: and controlling an indoor fan of the second indoor unit to operate at a first gear, and controlling the angle of an air deflector of the second indoor unit to enable the second indoor unit to blow air upwards.
As a preferable technical solution of the control method provided by the present invention, after the step of controlling the indoor fan of the second indoor unit to operate at the first gear and controlling the angle of the air deflector of the second indoor unit to blow air upward, the control method further includes: acquiring the temperature of a coil pipe of a second indoor unit; comparing the coil temperature with the freeze protection temperature of the indoor unit; and when the temperature of the coil pipe is higher than the freezing protection temperature, closing the indoor fan and the air deflector of the second indoor unit.
As a preferable aspect of the control method according to the present invention, the control method further includes, after the step of "adjusting the electronic expansion valve of the second indoor unit to a first set opening degree", the step of: acquiring the duration of the electronic expansion valve of the second indoor unit adjusting to a first set opening degree; comparing the duration to a first time threshold; when the duration is greater than or equal to the first time threshold, the outlet air temperature T of the first indoor unit is obtained againidAnd the indoor ambient temperature T of the first indoor unitihAnd indoor ambient humidity Tiw(ii) a Re-determining the indoor ambient temperature TihAnd indoor ambient humidity TiwCorresponding dew point temperature T of indoor environmentd(ii) a Will again the outlet air temperature TidAnd the dew point temperature TdCarrying out comparison; and controlling the electronic expansion valve of the second indoor unit according to the comparison result.
As a preferable aspect of the control method according to the present invention, the step of "controlling the electronic expansion valve of the second indoor unit based on the comparison result" includes: when the outlet air temperature T isidLess than the dew point temperature TdAnd then, increasing the opening degree of the electronic expansion valve of the second indoor unit to a second set opening degree.
As a preferable aspect of the control method provided by the present invention, "adjusting the electronic expansion valve of the second indoor unitThe step of opening until the risk of condensation of the first indoor unit is eliminated further includes: reacquiring the outlet air temperature T of the first indoor unitidAnd the indoor ambient temperature T of the first indoor unitihAnd indoor ambient humidity Tiw(ii) a Re-determining the indoor ambient temperature TihAnd indoor ambient humidity TiwCorresponding dew point temperature T of indoor environmentd(ii) a Will again the outlet air temperature TidAnd the dew point temperature TdComparing; when the outlet air temperature T is higheridGreater than the dew point temperature TdAnd if so, determining that the condensation risk of the first indoor unit is eliminated.
In a second aspect, the present invention further provides a storage medium, where a control program for preventing indoor unit condensation in an air conditioner is stored, and when the control program is executed by a processor, the control method for preventing indoor unit condensation in an air conditioner according to any one of the first aspect is implemented.
Under the condition of adopting the technical scheme, when the running first indoor unit has a condensation risk, the invention can realize the purpose of immediately eliminating the condensation risk of the first indoor unit by firstly keeping the current opening degree of the electronic expansion valve of the first indoor unit and only adjusting the opening degree of the electronic expansion valve of the second indoor unit until the condensation risk of the first indoor unit is eliminated, namely, shunting the refrigerant by the second indoor unit; then, when the condensation risk of the first indoor unit is eliminated, closing an electronic expansion valve of the second indoor unit; and meanwhile, the electronic expansion valve of the first indoor unit is increased with a compensation opening degree on the basis of the current opening degree. Therefore, on the premise of no condensation risk of the first indoor unit, the compensation opening degree of the first indoor unit is increased on the basis of the current opening degree of the first indoor unit to continue operation, condensation of the first indoor unit can be prevented timely, the refrigeration or dehumidification effect of the first indoor unit is guaranteed, and the problem of large indoor temperature fluctuation is avoided.
In addition, under the condition of adopting the technical scheme, the invention also obtains the temperature of the coil pipe of the second indoor unit, and closes the indoor fan and the air deflector of the second indoor unit when the temperature of the coil pipe is higher than the freezing protection temperature. Therefore, the second indoor unit can be prevented from frosting while the first indoor unit is prevented from being condensed, and the second indoor unit is prevented from entering an anti-freezing protection state when being started again.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are for illustrative purposes only and are not intended to constitute a limitation on the scope of the present invention. The control method for preventing condensation of an indoor unit in an air conditioner according to the present invention will be described with reference to the accompanying drawings in conjunction with a multi-split air conditioner. In the drawings:
fig. 1 is a schematic structural view of a multi-split air conditioner of the present embodiment;
fig. 2 is a flowchart illustrating a method for controlling condensation prevention of an indoor unit in an air conditioner according to the present embodiment.
List of reference numerals
1-a compressor; 2-outdoor heat exchanger; 3-an indoor unit; 4-electronic expansion valve.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that the terms "first", "second" and "third" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The air conditioner shown in fig. 1 is a multi-split air conditioner, which includes an outdoor unit and a plurality of indoor units 3, wherein, for example, the outdoor unit is provided with a compressor 1 and an outdoor heat exchanger 2, and the outdoor unit is generally provided with an outdoor fan (not shown) for radiating heat of the outdoor heat exchanger 2; the indoor unit 3 includes an indoor heat exchanger (also called a coil) and is provided with an indoor fan, and a wind deflector is disposed at an air outlet of the indoor unit 3 to adjust an opening size of the air outlet. When the air conditioner is in a refrigeration mode or a dehumidification mode, a refrigerant flows out of the exhaust end of the compressor 1, enters the outdoor heat exchanger 2, passes through the electronic expansion valve 4 corresponding to the opened indoor unit 3 and the indoor heat exchanger, and finally flows back to the suction end of the compressor 1.
When the air conditioner operates in a cooling mode or a dehumidification mode, an indoor heat exchanger in the indoor unit 3 is used as an evaporator, an indoor fan drives indoor air to enter from an air inlet of the indoor unit, the indoor heat exchanger absorbs heat of the indoor air, and formed cold air is blown to the indoor from an air outlet. At this time, the cold air blown out by the indoor unit 3 and the indoor hot air intersect at the air outlet of the indoor unit, and if the air outlet temperature of the indoor unit is lower than the dew point temperature of the indoor environment, moisture in the indoor hot air can form condensation at the panel, the air outlet and other positions of the indoor unit and drip to the ground, so that the use experience of a user is influenced.
The present embodiment aims to solve the above technical problem, that is, solve the problem that it is difficult to determine the accurate opening of the electronic expansion valve of the indoor unit in the air conditioner, so that the electronic expansion valve can prevent the condensation phenomenon and ensure the refrigeration or dehumidification effect in a short time.
In a first aspect, the present embodiment provides a method for controlling condensation prevention of indoor units in an air conditioner, where a plurality of indoor units 3 are connected to an outdoor unit of the air conditioner shown in fig. 1, and as shown in fig. 2, the method includes:
and S1, when the first indoor unit in operation has the condensation risk, searching for a second indoor unit in a shutdown state.
For example, in fig. 1, the indoor unit (i) is in a cooling mode or a dehumidification mode, and the indoor units (ii) to (iii) are all in a closed state, where the indoor unit (ii) is the second indoor unit nearest to the first indoor unit (i).
In step S1: the machine in idle condition that is the closest neighbor to the first machine can be found and determined as the second machine. Therefore, the second indoor unit nearest to the first indoor unit is directly controlled, the flow of the refrigerant in the first indoor unit can be directly and timely influenced, and the purpose of adjusting the outlet air temperature of the first indoor unit is achieved.
Or, all the indoor units in the shutdown state can be searched, and one of the indoor units is determined as the second indoor unit. In summary, the air temperature of the first indoor unit can be increased by reducing the cooling capacity of the first indoor unit by opening the electronic expansion valve of the second indoor unit in the shutdown state to reduce the amount of refrigerant entering the first indoor unit.
And S2, keeping the current opening degree of the electronic expansion valve of the first indoor unit, and adjusting the opening degree of the electronic expansion valve of the second indoor unit until the condensation risk of the first indoor unit is eliminated.
Note that, step S2 may include: and S21, adjusting the electronic expansion valve of the second indoor unit to a first set opening degree. The first set opening may be a minimum opening of the electronic expansion valve allowing the refrigerant to normally pass through. In order to guarantee to realize the in-process to the refrigerant reposition of redundant personnel, can also reduce the influence to the refrigeration of first indoor set or dehumidification effect.
Further, while step S21 is executed, the indoor fan of the second indoor unit may be controlled to operate at the first gear, and the second indoor unit may be blown upward by controlling the angle of the air guide plate of the second indoor unit. The first gear can be a gear corresponding to the lowest wind speed of the indoor unit, so that the air around the second indoor unit slightly exchanges heat with the coil pipe of the second indoor unit, and the phenomenon that the coil pipe of the second indoor unit is too low in temperature and frosted to affect the working performance of the second indoor unit in the later normal use process is avoided. Meanwhile, the second indoor unit blows air upwards by controlling the angle of the air deflector of the second indoor unit, and the influence of cold air blown out of the second indoor unit on other users can be avoided.
As a preferable implementation manner of the foregoing control method provided in this embodiment, after step S21, the method further includes:
s22, acquiring the coil temperature of the second indoor unit;
and S23, comparing the coil temperature with the freezing protection temperature of the indoor unit.
And S24, when the temperature of the coil pipe is higher than the freezing protection temperature, closing the indoor fan and the air deflector of the second indoor unit.
It should be noted that, if the indoor unit is in a low temperature state for cooling operation, the surface of the indoor heat exchanger will be frosted, and when the temperature of the indoor heat exchanger is reduced to below 0 ℃ and is maintained for a period of time, the microcomputer of the indoor unit will stop the operation of the compressor of the outer unit to protect the unit.
In order to avoid the above problem, in this embodiment, the coil temperature of the second indoor unit is obtained, and when the coil temperature is higher than the freeze protection temperature, the indoor fan and the air deflector of the second indoor unit may be turned off. Therefore, the second indoor unit can be prevented from frosting while the first indoor unit is prevented from being condensed, and the second indoor unit is prevented from entering an anti-freezing protection state when being restarted.
It can be understood that, in general, the purpose of preventing condensation of the first indoor unit can be achieved only by adjusting the electronic expansion valve of the second indoor unit to the first set opening degree. But for special cases, after step S21, it may further include:
s201, obtaining the duration of the electronic expansion valve of the second indoor unit adjusted to the first set opening degree.
S202, comparing the duration with a first time threshold value.
The first time threshold is the time required for the first indoor unit to operate again to reach the steady state after the electronic expansion valve of the second indoor unit is adjusted to the first set opening degree, and the time is generally tens of seconds, which can be selected according to actual requirements.
S203, when the duration is greater than or equal toWhen the first time threshold value is reached, the outlet air temperature T of the first indoor unit is obtained againidAnd the indoor ambient temperature T of the first indoor unitihAnd indoor ambient humidity Tiw；
S204, re-determining the indoor environment temperature TihAnd indoor ambient humidity TiwCorresponding dew point temperature T of indoor environmentd；
S205, resetting the outlet air temperature TidAnd dew point temperature TdComparing;
and S206, controlling the electronic expansion valve of the second indoor unit according to the comparison result.
Specifically, step S206 includes: when the outlet air temperature TidLess than dew point temperature TdAnd then, the opening degree of the electronic expansion valve of the second indoor unit is increased to a second set opening degree. That is, the outlet air temperature of the first indoor unit is continuously raised by further reducing the flow rate of the refrigerant flowing through the first indoor unit.
S3, when the condensation risk of the first indoor unit is eliminated, closing the electronic expansion valve of the second indoor unit; and meanwhile, the electronic expansion valve of the first indoor unit is increased with a compensation opening degree on the basis of the current opening degree.
The compensation opening degree may be a set value or may be set with reference to the opening degree of the electronic expansion valve before the second indoor unit is closed.
In the case of adopting the foregoing embodiment, when the running first indoor unit has a risk of condensation, the present embodiment can immediately eliminate the risk of condensation of the first indoor unit by first maintaining the current opening degree of the electronic expansion valve of the first indoor unit and only adjusting the opening degree of the electronic expansion valve of the second indoor unit until the risk of condensation of the first indoor unit is eliminated, that is, by shunting the refrigerant by the second indoor unit; then, when the condensation risk of the first indoor unit is eliminated, closing an electronic expansion valve of the second indoor unit; and meanwhile, the electronic expansion valve of the first indoor unit is increased with a compensation opening degree on the basis of the current opening degree. Therefore, on the premise of no condensation risk of the first indoor unit, the compensation opening degree of the first indoor unit is increased on the basis of the current opening degree of the first indoor unit to continue operation, condensation of the first indoor unit can be prevented timely, the refrigeration or dehumidification effect of the first indoor unit is guaranteed, and the problem of large indoor temperature fluctuation is avoided.
As a preferable implementation manner of the above control method provided in this embodiment, step S2 further includes:
s211, obtaining the air outlet temperature T of the first indoor unit againidAnd the indoor ambient temperature T of the first indoor unitihAnd indoor ambient humidity Tiw；
S212, re-determining the indoor environment temperature TihAnd indoor ambient humidity TiwCorresponding dew point temperature T of indoor environmentd；
S213, changing the outlet air temperature T againidAnd dew point temperature TdCarrying out comparison;
s214, current outlet air temperature TidGreater than dew point temperature TdAnd if so, determining that the condensation risk of the first indoor unit is eliminated.
As a preferred embodiment of the control method according to the present embodiment, before step S1, the method further includes the step of determining whether the first indoor unit is at risk of condensation:
s101, when the first indoor unit is in a refrigeration mode or a dehumidification mode, obtaining the air outlet temperature T of the first indoor unitidAnd the indoor ambient temperature T of the first indoor unitihAnd indoor ambient humidity Tiw；
S102, determining indoor environment temperature TihAnd indoor ambient humidity TiwCorresponding dew point temperature T of indoor environmentd；
S103, setting the air outlet temperature TidAnd dew point temperature TdComparing;
s104, when the outlet air temperature TidLess than dew point temperature TdAnd if so, determining that the first indoor unit is at the risk of condensation.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
In a second aspect, the present embodiment further provides a storage medium, where a control program for preventing condensation of an indoor unit in an air conditioner is stored, and when the control program for preventing condensation of an indoor unit in an air conditioner is executed by a processor, the control method for preventing condensation of an indoor unit in an air conditioner according to any one of the first aspect is implemented.
It should be noted that, in the air conditioner provided in this embodiment, the air conditioner includes: the control program of the air conditioner realizes the control method for preventing condensation of the indoor unit in the air conditioner of the embodiment when being executed by the processor. The processor may be a controller specially used for executing the method of the present invention, or may be a functional module or a functional unit of a general controller.
The storage medium includes, but is not limited to, a usb disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, a flash Memory, a volatile Memory, a non-volatile Memory, a serial Memory, a parallel Memory, or a register, and various media capable of storing program codes, and the processor includes, but is not limited to, a CPLD/FPGA, a DSP, an ARM processor, and an MIPS processor. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
The present invention may also be embodied as an apparatus or device program (e.g., PC program and PC program product) for carrying out a portion or all of the methods described herein. Such a program implementing the invention may be stored on a PC readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It is noted that the control method for preventing condensation in the indoor unit of the air conditioner provided in the above embodiment may be implemented as a corresponding control system, and the control system at least includes a search module for executing step S1 and an adjustment module for executing steps S2 and S3. It should be understood that the present embodiment is illustrated by only dividing the functional modules (such as the search module and the adjustment module) in the foregoing, and in practical applications, the functional modules may be completed by different functional modules according to needs, that is, the functional modules in the embodiment of the present invention are further decomposed or combined, for example, the functional modules in the embodiment may be combined into one functional module, or may be further decomposed into a plurality of sub-modules, so as to complete all or part of the functions described above. The names of the function modules related to the embodiments of the present invention are only for distinguishing and are not to be construed as an improper limitation of the present invention.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method for preventing condensation of indoor units in an air conditioner is characterized in that a plurality of indoor units are connected to one outdoor unit of the air conditioner, and the control method comprises the following steps:
when the running first indoor unit has a condensation risk, searching a second indoor unit in a shutdown state;
keeping the current opening degree of the electronic expansion valve of the first indoor unit, and adjusting the opening degree of the electronic expansion valve of the second indoor unit until the condensation risk of the first indoor unit is eliminated;
when the condensation risk of the first indoor unit is eliminated, closing an electronic expansion valve of the second indoor unit; meanwhile, the electronic expansion valve of the first indoor unit is increased with a compensation opening degree on the basis of the current opening degree;
the compensation opening degree is set with reference to an opening degree of the electronic expansion valve before the second indoor unit is closed.
2. The control method according to claim 1, further comprising, before "searching for the second indoor unit in the shutdown state":
when the first indoor unit is in a refrigeration mode or a dehumidification mode, the outlet air temperature of the first indoor unit is obtainedT idAnd the indoor ambient temperature of the first indoor unitT ihAnd the indoor environment humidityT iw；
Determining the indoor ambient temperatureT ihAnd the indoor environment humidityT iwDew point temperature of the corresponding indoor environmentT d；
Will the outlet air temperatureT idAnd the dew point temperatureT dComparing;
when the outlet air temperature is higher than the predetermined valueT idLess than the dew point temperatureT dAnd if so, determining that the first indoor unit has a condensation risk.
3. The control method according to claim 1, wherein the step of "searching for the second indoor unit in the stopped state" includes:
searching an indoor unit which is nearest to the first indoor unit and is in a shutdown state, and determining the indoor unit as a second indoor unit; alternatively, the first and second liquid crystal display panels may be,
and searching all the indoor units in the shutdown state, and determining one indoor unit as a second indoor unit.
4. The control method according to claim 1, wherein the step of "adjusting the opening degree of the electronic expansion valve of the second indoor unit until the risk of condensation of the first indoor unit is eliminated" includes:
and adjusting the electronic expansion valve of the second indoor unit to a first set opening degree.
5. The control method according to claim 4, wherein the step of adjusting the electronic expansion valve of the second indoor unit to a first set opening degree further comprises:
and controlling an indoor fan of the second indoor unit to operate at a first gear, and controlling the angle of an air deflector of the second indoor unit to enable the second indoor unit to blow air upwards.
6. The control method according to claim 5, further comprising, after the step of controlling the indoor fan of the second indoor unit to operate in the first position and blowing air upward from the second indoor unit by controlling an angle of a louver of the second indoor unit:
acquiring the temperature of a coil of a second indoor unit;
comparing the coil temperature with the freeze protection temperature of the indoor unit;
and when the temperature of the coil pipe is higher than the freezing protection temperature, closing an indoor fan and an air deflector of the second indoor unit.
7. The control method according to claim 4, further comprising, after the step of "adjusting the electronic expansion valve of the second indoor unit to a first set opening degree":
acquiring the duration of the electronic expansion valve of the second indoor unit adjusting to a first set opening degree;
comparing the duration to a first time threshold;
when the duration time is greater than or equal to the first time threshold value, the outlet air temperature of the first indoor unit is obtained againT idAnd the indoor ambient temperature of the first indoor unitT ihAnd indoor ambient humidityT iw；
Re-determining the indoor ambient temperatureT ihAnd the indoor environment humidityT iwCorresponding dew point temperature of indoor environmentT d；
Will the outlet air temperature againT idAnd the dew point temperatureT dComparing;
and controlling the electronic expansion valve of the second indoor unit according to the comparison result.
8. The control method according to claim 7, wherein the step of controlling the electronic expansion valve of the second indoor unit according to the comparison result comprises:
when the outlet air temperature is higherT idLess than the dew point temperatureT dAnd then, increasing the opening degree of the electronic expansion valve of the second indoor unit to a second set opening degree.
9. The control method according to claim 4, wherein the step of adjusting the opening degree of the electronic expansion valve of the second indoor unit until the risk of condensation in the first indoor unit is eliminated further comprises:
reacquiring the outlet air temperature of the first indoor unitT idAnd the indoor ambient temperature of the first indoor unitT ihAnd indoor ambient humidityT iw；
Re-determining the indoor ambient temperatureT ihAnd indoor ringAmbient humidityT iwDew point temperature of the corresponding indoor environmentT d；
Will the outlet air temperature againT idAnd the dew point temperatureT dCarrying out comparison;
when the outlet air temperature is higher than the predetermined valueT idAbove the dew point temperatureT dAnd if so, determining that the condensation risk of the first indoor unit is eliminated.
10. A storage medium having stored thereon a control program for preventing condensation in an indoor unit of an air conditioner, the control program for preventing condensation in an indoor unit of an air conditioner, when executed by a processor, implementing a control method for preventing condensation in an indoor unit of an air conditioner according to any one of claims 1 to 9.
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