CN113531783A - Refrigeration anti-freezing control method and device of multi-connected air conditioning system - Google Patents
Refrigeration anti-freezing control method and device of multi-connected air conditioning system Download PDFInfo
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- CN113531783A CN113531783A CN202110822974.8A CN202110822974A CN113531783A CN 113531783 A CN113531783 A CN 113531783A CN 202110822974 A CN202110822974 A CN 202110822974A CN 113531783 A CN113531783 A CN 113531783A
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The embodiment of the specification provides a refrigeration anti-freezing control method and device for a multi-connected air conditioning system, and the method comprises the following steps: acquiring the running states of all indoor units connected with an outdoor unit of the multi-connected air conditioning system; acquiring the liquid pipe temperature and the air pipe temperature of the heat exchanger of each indoor unit in the starting state, and calculating the temperature difference of the heat exchanger corresponding to each indoor unit in the starting state; calculating the average temperature of the current liquid tubes of all indoor units in a starting state; judging whether the average temperature of the liquid pipe is greater than or equal to a preset lower limit value or not; if yes, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling the electronic expansion valve of the indoor unit meeting the first preset condition to be closed. The invention closes the electronic expansion valve aiming at the indoor unit with freezing risk, so that the temperature of the liquid pipe of the indoor unit is gradually increased, and the targeted anti-freezing control of each indoor unit is realized.
Description
Technical Field
One or more embodiments of the present disclosure relate to the field of air conditioning technologies, and in particular, to a method and an apparatus for controlling refrigeration and freezing prevention of a multi-split air conditioning system.
Background
At present, a multi-connected air conditioning system generally adopts a single module to drive a plurality of indoor units, or adopts a plurality of modules to drive more indoor units, the rated capacity of the outdoor unit is generally far greater than that of the indoor units, when the load of the indoor units is smaller and the number of the indoor units is smaller, the liquid pipe temperature of the indoor units is lower even if the outdoor unit operates at a lower frequency, and at this time, in order to prevent the indoor units from being frozen, a certain control method is usually required to realize the anti-freezing of the indoor units.
Disclosure of Invention
One or more embodiments of the present specification describe a method and an apparatus for controlling refrigeration and freezing prevention of a multi-connected air conditioning system.
The first aspect provides a refrigeration anti-freezing control method for a multi-connected air conditioning system, which comprises the following steps:
acquiring running states of all indoor units connected with an outdoor unit of the multi-connected air conditioning system, wherein the running states comprise a starting state and a shutdown state;
acquiring the liquid pipe temperature and the gas pipe temperature of the heat exchanger of each indoor unit in the starting state, and calculating the temperature difference of the heat exchanger corresponding to each indoor unit in the starting state; the temperature difference of the heat exchanger is the difference between the corresponding air pipe temperature and the corresponding liquid pipe temperature of the indoor unit;
Calculating the average temperature of the current liquid tubes of all indoor units in a starting state; the average liquid pipe temperature is the average liquid pipe temperature corresponding to all indoor units in the starting state;
judging whether the average temperature of the liquid pipe is greater than or equal to a preset lower limit value or not;
if yes, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling an electronic expansion valve of the indoor unit meeting the first preset condition to be closed; the method comprises the steps that after the electronic expansion valve is closed, the temperature of a liquid pipe of a heat exchanger of a corresponding indoor unit is obtained in real time, and the electronic expansion valve is opened when the temperature of the liquid pipe is larger than a first preset value;
the first preset condition comprises that the duration of the liquid pipe temperature corresponding to the indoor unit is less than a second preset value and the heat exchanger temperature difference is less than a third preset value reaches a preset duration, and the electronic expansion valve is arranged on a refrigerant pipeline of the indoor unit.
A second aspect provides a refrigeration anti-freezing control device of a multi-connected air conditioning system, which includes:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the running states of all indoor units connected with an outdoor unit of the multi-connected air conditioning system, and the running states comprise a starting state and a shutdown state;
The second acquisition module is used for acquiring the liquid pipe temperature and the air pipe temperature of the heat exchanger of each indoor unit in the starting state and calculating the temperature difference of the heat exchanger corresponding to each indoor unit in the starting state; the temperature difference of the heat exchanger is the difference between the corresponding air pipe temperature and the corresponding liquid pipe temperature of the indoor unit;
the first calculation module is used for calculating the average temperature of the current liquid tubes of all the indoor units in the starting state; the average liquid pipe temperature is the average liquid pipe temperature corresponding to all indoor units in the starting state;
the first judgment module is used for judging whether the average temperature of the liquid pipe is greater than or equal to a preset lower limit value or not; if yes, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling an electronic expansion valve of the indoor unit meeting the first preset condition to be closed; the method comprises the steps that after the electronic expansion valve is closed, the temperature of a liquid pipe of a heat exchanger of a corresponding indoor unit is obtained in real time, and the electronic expansion valve is opened when the temperature of the liquid pipe is larger than a first preset value; the first preset condition comprises that the duration of the liquid pipe temperature corresponding to the indoor unit is less than a second preset value and the heat exchanger temperature difference is less than a third preset value reaches a preset duration, and the electronic expansion valve is arranged on a refrigerant pipeline of the indoor unit.
In the method and the device for controlling refrigeration and freezing prevention of a multi-connected air conditioning system provided in the embodiment of the present specification, when the average temperature of a liquid pipe is greater than or equal to a preset lower limit value, it is determined whether each indoor unit in a startup state meets a first preset condition, and an electronic expansion valve of the indoor unit meeting the first preset condition is controlled to be closed; and acquiring the temperature of a liquid pipe of the heat exchanger corresponding to the indoor unit in real time after the electronic expansion valve is closed, and opening the electronic expansion valve when the temperature of the liquid pipe is greater than a first preset value. That is to say, under the condition that the overall risk of the air conditioning system is not high, the judgment and the processing are performed on each indoor unit, the electronic expansion valve is closed, the temperature of the liquid pipe of the indoor unit can be gradually increased, when the temperature is increased to the first preset value, the risk that the indoor unit is frozen is low, the electronic expansion valve can be opened for normal refrigeration, and the targeted anti-freezing control on each indoor unit in the multi-connected air conditioning system is realized.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present specification, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow chart of a refrigeration anti-freezing control method of a multi-connected air conditioning system in one embodiment of the present specification.
Detailed Description
The scheme provided by the specification is described below with reference to the accompanying drawings.
In a first aspect, the present invention provides a refrigeration anti-freezing control method for a multi-connected air conditioning system, which may be executed by a control unit of an outdoor unit. As shown in fig. 1, the method may include:
s110, acquiring running states of all indoor units connected with outdoor units of the multi-connected air conditioning system, wherein the running states comprise a starting state and a shutdown state;
in specific implementation, the outdoor unit and each indoor unit can communicate through the MM1192 chip. The MM1192 chip has the advantages of simple circuit design, low price, reliable communication, easy expansion and the like, and is an ideal communication mode.
For example, if there are N indoor units connected to the outdoor unit, the operating states of the N indoor units at that time can be obtained. And the control unit of the outdoor unit sends a state acquisition instruction to the N indoor units, and the N indoor units determine the operation state according to the relevant information after receiving the instruction and return the operation state to the control unit of the outdoor unit.
It can be understood that, through S110, it can be determined whether the indoor unit is turned on, because the anti-freezing control method is for the indoor unit that performs cooling in the on state.
S120, acquiring the liquid pipe temperature and the gas pipe temperature of the heat exchanger of each indoor unit in the starting state, and calculating the temperature difference of the heat exchanger corresponding to each indoor unit in the starting state; the temperature difference of the heat exchanger is the difference between the corresponding air pipe temperature and the corresponding liquid pipe temperature of the indoor unit;
for example, M indoor units of the N indoor units are in a startup state and in a cooling mode, and then, for each of the M indoor units, the liquid pipe temperature and the gas pipe temperature of the heat exchanger at that time are obtained, and then the difference between the gas pipe temperature and the liquid pipe temperature is calculated to obtain the temperature difference of the heat exchanger at that time.
In particular, the liquid pipe temperature and the gas pipe temperature of the heat exchanger can be measured by the NTC sensor. The control unit of the outdoor unit sends a temperature acquisition instruction to the indoor unit, when the NTC sensor on the heat exchanger of the indoor unit acquires the temperature of the liquid pipe and the temperature of the air pipe, the temperature is sent to the indoor unit, and the indoor unit transmits the temperature to the control unit of the outdoor unit.
S1310, calculating the average temperature of liquid pipes of all indoor units in a starting state; the average liquid pipe temperature is the average liquid pipe temperature corresponding to all indoor units in the starting state;
It can be understood that the average liquid pipe temperature is obtained by averaging the liquid pipe temperatures of all indoor units in the starting state. For example, if M indoor units are in an on state, the average liquid pipe temperature is the average liquid pipe temperature of the M indoor units.
S140, judging whether the average temperature of the liquid pipe is greater than or equal to a preset lower limit value or not;
if yes, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling an electronic expansion valve of the indoor unit meeting the first preset condition to be closed; the method comprises the steps that after the electronic expansion valve is closed, the temperature of a liquid pipe of a heat exchanger of a corresponding indoor unit is obtained in real time, and the electronic expansion valve is opened when the temperature of the liquid pipe is larger than a first preset value;
the first preset condition comprises that the duration of the liquid pipe temperature corresponding to the indoor unit is less than a second preset value and the heat exchanger temperature difference is less than a third preset value reaches a preset duration, and the electronic expansion valve is arranged on a refrigerant pipeline of the indoor unit.
It can be understood that if the average temperature of the liquid pipe is greater than or equal to the preset lower limit value, it indicates that the overall freezing risk of all the started indoor units connected to the outdoor unit is not very high, and it does not exclude that the freezing risk of individual indoor units is relatively high, so that a specific judgment needs to be performed for each indoor unit.
It can be understood that when the temperature of the liquid pipe of the heat exchanger of the indoor unit is less than the second preset value, the temperature difference of the heat exchanger is less than the third preset value, and the duration time reaches the preset time, it indicates that the indoor unit is in a low-temperature state continuously, and freezing is likely to occur.
It can be understood that when the first preset condition is met, the electronic expansion valve is closed, the electronic expansion valve is arranged on a refrigerant pipeline of the indoor unit, and after the electronic expansion valve is closed, a passage of a refrigerant entering the indoor unit is cut off, so that the temperature of the indoor unit is not reduced continuously. Under the influence of the indoor temperature, the temperature of a liquid pipe of a heat exchanger of the indoor unit gradually rises, and the freezing risk gradually falls. After the electronic expansion valve is closed, the temperature of a liquid pipe of the indoor unit needs to be acquired in real time, when the temperature of the liquid pipe is greater than a first preset value, the risk of freezing of the indoor unit is very low, the anti-freezing control of the indoor unit needs to be removed, and at the moment, the electronic expansion valve can be opened to continue refrigerating.
In specific real time, the control unit of the outdoor unit may generate an instruction to the indoor unit to cause the indoor unit to set TARGET _ EXV [ N ] to 0, thereby controlling the closing of the electronic expansion valve.
The invention provides a refrigeration anti-freezing control method of a multi-connected air conditioning system, which is characterized in that when the average temperature of a liquid pipe is more than or equal to a preset lower limit value, whether each indoor unit in a starting state meets a first preset condition is judged, and an electronic expansion valve of the indoor unit meeting the first preset condition is controlled to be closed; and acquiring the temperature of a liquid pipe of the heat exchanger corresponding to the indoor unit in real time after the electronic expansion valve is closed, and opening the electronic expansion valve when the temperature of the liquid pipe is greater than a first preset value. That is to say, under the condition that the overall risk of the air conditioning system is not high, the judgment and the processing are performed on each indoor unit, the electronic expansion valve is closed, the temperature of the liquid pipe of the indoor unit can be gradually increased, when the temperature is increased to the first preset value, the risk that the indoor unit is frozen is low, the electronic expansion valve can be opened for normal refrigeration, and the targeted anti-freezing control on each indoor unit in the multi-connected air conditioning system is realized.
In specific implementation, the method provided by the invention can further comprise the following steps:
s150, if the average temperature of the liquid pipes is lower than the preset lower limit value, controlling a compressor of an outdoor unit of the multi-connected air-conditioning system to enter a frequency raising stopping mode, and opening an air bypass valve arranged between an exhaust port and a return port of the compressor; after entering the stop audio frequency mode and opening the air bypass valve, acquiring the liquid pipe temperatures of the heat exchangers of all indoor units in a starting state in real time, calculating the average liquid pipe temperatures of all indoor units, and controlling the compressor to exit the stop frequency increasing mode and close the air bypass valve when the average liquid pipe temperature is greater than a preset upper limit value;
S160, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling the electronic expansion valve of the indoor unit meeting the first preset condition to be closed; and acquiring the temperature of a liquid pipe of the heat exchanger corresponding to the indoor unit in real time after the electronic expansion valve is closed, and opening the electronic expansion valve when the temperature of the liquid pipe is greater than a first preset value.
It can be understood that the first preset condition is not met, which indicates that the indoor unit has no freezing risk and does not need to perform subsequent processing.
It can be understood that if the average temperature of the liquid pipes is less than the preset lower limit value, it indicates that the overall liquid pipe temperatures of all the indoor units started up at this time are low, and there is a great risk of freezing, and the risk of freezing at this time is higher than the case where the average temperature of the liquid pipes is greater than or equal to the preset lower limit value. At which point an overall adjustment is required.
It will be appreciated that since the wastegate is disposed between the exhaust and return ports of the compressor. When the air bypass valve is closed, the air in the compressor is exhausted through the exhaust port, converted into liquid outside the room, returned to the indoor unit, converted into air again and finally returned to the air return port. When the air bypass valve is opened, a part of air discharged from the air outlet is directly returned to the air return port, so that the high-pressure of the air conditioning system can be reduced, and the low-pressure can be reduced. Meanwhile, the compressor of the outdoor unit is controlled to enter the frequency raising stopping mode, namely the compressor is controlled to stop raising the frequency, so that the refrigerating capacity of the whole air conditioning system is not increased any more. Through the two modes, the average temperature of the liquid pipes of all the started indoor units can be prevented from continuously decreasing, so that the freezing risk is greatly reduced.
It can be understood that, in order to avoid energy waste, the frequency rising cannot be stopped for a long time, so after the audio frequency stopping mode is entered and the air bypass valve is opened, the liquid pipe temperatures of the heat exchangers of all the indoor units in the starting state are acquired in real time, the average liquid pipe temperatures of all the indoor units are calculated, and when the average liquid pipe temperature is greater than a preset upper limit value, the compressor is controlled to exit the frequency rising stopping mode, and the air bypass valve is closed. That is to say, after a period of time adjustment, when the average temperature of the liquid tubes of all the started indoor units is greater than the preset upper limit value, the risk of freezing is greatly reduced, and at this time, the stop frequency increasing mode can be exited, the air bypass valve is closed, and the normal working state is recovered.
However, since the average temperature of the liquid pipe reflects the overall risk of freezing, but does not represent that all indoor units have no risk of freezing, it is necessary to perform a targeted judgment and processing for each indoor unit. Therefore, after the compressor is controlled to exit the frequency increasing stopping mode and the air bypass valve is closed, whether an indoor unit with a high freezing risk exists is judged according to a first preset condition, and the electronic expansion valve of the indoor unit with the high freezing risk is closed, so that the freezing risk of the indoor unit is reduced. After the freezing risk is reduced to a certain degree, the electronic expansion valve can be opened to recover the normal state.
It can be seen that two measures are taken here to prevent the indoor unit from freezing. The whole air conditioning system is judged and processed firstly, and then each indoor unit is judged and processed, so that the freezing risk is greatly reduced.
In specific implementation, the method provided by the invention can further comprise:
s170, acquiring the room temperature and the indoor coil temperature of each indoor unit in the starting state, and controlling the indoor units meeting the second preset condition to enter an anti-condensation protection mode;
the second preset condition comprises that the room temperature is greater than a fourth preset value and the temperature of the indoor coil is less than or equal to a fifth preset value, or the room temperature is less than or equal to the fourth preset value and is greater than a sixth preset value and the temperature of the indoor coil is less than or equal to a seventh preset value;
wherein the fourth preset value, the sixth preset value, the fifth preset value and the seventh preset value are decreased in sequence. The specific temperature values can be set as required, for example, the fourth preset value is set to 30 °, the sixth preset value is 25 °, the fifth preset value is 17 °, and the seventh preset value is 15 °. That is, the two second preset conditions are respectively: the room temperature is more than 30 ℃, the temperature of the indoor coil is less than or equal to 17 ℃, the temperature of the indoor coil is more than 25 ℃ and less than or equal to 30 ℃, and the temperature of the indoor coil is less than or equal to 15 ℃. When either of these two conditions is satisfied, the air conditioner needs to perform an anti-condensation protection phase. Otherwise, the air conditioner can enter a normal wind speed control stage.
It can be understood that the above S170 is performed under the normal cooling condition with a low freezing risk and with the fan turned on.
In specific implementation, if there is an indoor unit that does not satisfy the second preset condition, the method provided by the present invention further includes:
s180, controlling the indoor unit which does not meet the second preset condition to enter a normal wind speed control mode; aiming at an indoor unit entering a normal wind speed control mode, acquiring a user set temperature, and determining a corresponding first control wind speed according to the user set temperature and the room temperature;
the process of determining the first control wind speed may specifically include:
(1) if the room temperature is greater than the user set temperature and the difference between the room temperature and the user set temperature is greater than an eighth preset value, the first control wind speed is the user set wind speed;
that is, the room temperature is higher than the user-set temperature by a relatively large amount, which indicates that the room temperature is still relatively high, and the ambient temperature is still relatively high, and the user-set wind speed is set as the first control wind speed. The first preset value can be set as required, for example, set to 2 degrees celsius.
(2) If the room temperature is greater than the user set temperature, and the difference between the room temperature and the user set temperature is less than or equal to the eighth preset value and greater than a ninth preset value, the first control wind speed is not higher than the wind speed corresponding to the medium-speed wind gear and not higher than the user set wind speed;
The second preset value can be set according to user requirements, for example, set to 1 degree celsius.
That is, the room temperature is higher than the user-set temperature, but the difference between the room temperature and the user-set temperature is not particularly high, and at this time, the first control wind speed is set to be equal to or less than the user-set wind speed and equal to or less than the wind speed corresponding to the medium-speed gear.
(3) If the room temperature is greater than the user set temperature and the difference between the room temperature and the user set temperature is less than or equal to the ninth preset value, the first control wind speed is not higher than the wind speed corresponding to the low-speed wind gear and not higher than the user set wind speed;
that is, the room temperature is higher than the user set temperature, but the difference between the room temperature and the user set temperature is relatively small, and at this time, the first control wind speed may be set to be equal to or less than the user set wind speed and equal to or less than the wind speed corresponding to the low-speed wind gear.
(4) If the room temperature is less than or equal to the temperature set by the user, the first control wind speed is the wind speed corresponding to the breeze level;
that is, when the room temperature is equal to or lower than the user set temperature, the first control wind speed is set to the wind speed corresponding to the micro-wind level.
The wind speed gears of the fan comprise a strong wind gear, a high-speed wind gear, a medium-speed wind gear, a low-speed wind gear and a micro wind gear. The gentle wind gear is the lowest gear.
As can be seen from S180, when the room temperature is higher than the user set temperature, the difference between the two is smaller, and the first control air speed is smaller, because when the difference between the two is smaller, it may not be necessary to cool the indoor air too fast, so that the indoor temperature gradually approaches the user set temperature, so that the user gradually adapts to the user set temperature. When the room temperature is lower than the set temperature of a user, the situation rarely occurs in the refrigeration process, and the wind speed of the lowest gear is selected as the first control wind speed to meet the requirement.
After the first control wind speed is determined, the first control wind speed is not directly adopted to control the wind speed of the fan, but the first control wind speed is further adjusted according to the temperature of the coil pipe of the heat exchanger to obtain a second control wind speed, so that the final control wind speed not only considers the room temperature and the temperature set by a user, but also considers the temperature of the coil pipe of the heat exchanger, and the second control wind speed is obtained to control the wind speed of the fan from multiple angles, so that the control of the fan is more reasonable.
S190, acquiring the coil temperature of a heat exchanger in the indoor unit, determining the relationship between the coil temperature and a preset temperature interval, determining a second control air speed according to the relationship and the first control air speed, and sending the second control air speed to the corresponding indoor unit so that the indoor unit can control the air speed of an air conditioning fan according to the second control air speed.
The preset temperature interval can be set as required.
In particular implementations, the process of determining the second control wind speed in S190 may include:
(1) if the temperature of the coil pipe of the heat exchanger is smaller than the minimum value of the preset temperature interval, taking the first control wind speed as a second control wind speed;
it can be understood that if the temperature of the coil of the heat exchanger is smaller than the minimum value of the preset temperature interval, it is indicated that the temperature of the coil of the heat exchanger is very low, and the situation that dry hot gas directly blows out to a user rarely occurs at this time, so that the first control wind speed can be directly used as the second control wind speed, that is, the wind speed of the fan is controlled by the first control wind speed.
(2) If the temperature of the coil pipe of the heat exchanger is within the preset temperature range, the second control wind speed is less than or equal to the first control wind speed, and the second control wind speed cannot exceed the wind speed corresponding to the medium-speed gear;
it can be understood that when the temperature of the coil of the heat exchanger is within the preset temperature range, that is, the temperature of the coil of the heat exchanger is not particularly high or not particularly low, the second control air speed can be set to a moderate value, the value cannot exceed the air speed corresponding to the medium-speed air gear and cannot exceed the first control air speed, and at this time, the air-conditioning fan does not bring strong dryness heat to a user when running.
It will be appreciated that the liquid and gas tubes are located at both ends of the coil.
In a specific implementation, the first control wind speed may be a wind speed corresponding to a strong wind level, a high-speed wind level, a medium-speed wind level, a low-speed wind level, or a light wind level, and when the first control wind speed is a wind speed corresponding to a strong wind level or a high-speed wind level, because the second control wind speed cannot exceed the first control wind speed and cannot exceed a wind speed corresponding to a medium-speed wind level, the wind speed that the second control wind speed can select may be a wind speed corresponding to a medium-speed wind level, a low-speed wind level, or a light wind level, and in order to reach an optimal operation state as soon as possible, the wind speed corresponding to a medium-speed wind level may be selected as the second control wind speed. That is, if the first control wind speed is a wind speed corresponding to a strong wind stop or a high-speed wind stop, the second control wind speed is a wind speed corresponding to a medium-speed wind stop.
In specific implementation, if the first control wind speed is less than or equal to the wind speed corresponding to the medium-speed gear, the first control wind speed is used as a second control wind speed. For example, the first control wind speed is a wind speed corresponding to a medium speed gear, the second control wind speed may be selected as a wind speed corresponding to a medium speed gear, a low speed gear or a gentle wind gear, and the second control wind speed may be selected as a wind speed corresponding to a medium speed gear in order to achieve an optimal operation state as soon as possible. For another example, the first control wind speed may be a wind speed corresponding to a low-speed gear, and the second control wind speed may be selected to have a wind speed corresponding to a low-speed gear or a light gear. For another example, the first control wind speed is a wind speed corresponding to a micro-speed gear, and the second control wind speed can only be selected from the wind speeds corresponding to the micro-speed gears. It can be seen that, if the first control wind speed is less than or equal to the wind speed corresponding to the medium-speed gear, the first control wind speed may be used as a second control wind speed.
(3) And if the temperature of the coil pipe of the heat exchanger is greater than the maximum value of the preset temperature interval, the second control wind speed is less than or equal to the first control wind speed, and the second control wind speed cannot exceed the wind speed corresponding to the low-speed wind gear.
It can be understood that if the temperature of the coil of the heat exchanger is greater than the maximum value of the preset temperature interval, it is indicated that the temperature of the coil of the heat exchanger is very high at the moment, and the situation that dry hot gas directly flaps the user is likely to happen, so that the second control air speed is very low, that is, the air speed of the fan is very low, the air speed corresponding to the low-speed air gear cannot be exceeded, the first control air speed cannot be exceeded, and by reducing the second control air speed, the rapid direct flap of the dry hot gas to the user can be reduced, and the experience of the user is improved.
In specific implementation, if the first control wind speed is a wind speed corresponding to a strong wind gear, a high-speed wind gear or a medium-speed wind gear, and the second control wind speed cannot exceed a wind speed corresponding to a low-speed wind gear and cannot exceed the first control wind speed, the wind speed that can be selected by the second control wind speed is a wind speed corresponding to a low-speed wind gear or a light wind gear, and in order to enable the fan to reach an optimal operation state as soon as possible, the wind speed corresponding to the low-speed wind gear can be selected by the second control wind speed.
In specific implementation, if the first control wind speed is a wind speed corresponding to a low wind gear, the second control wind speed may select a wind speed corresponding to a low-speed wind gear or a light wind gear, and in order to enable the fan to reach an optimal operation state as soon as possible, the second control wind speed may select a wind speed corresponding to a low-speed wind gear.
In a specific implementation, if the first controlled wind speed is a wind speed corresponding to a gentle wind level, the second controlled wind speed is a wind speed corresponding to a gentle wind level.
That is, if the first controlled wind speed is equal to or less than the wind speed corresponding to the low-speed gear, the first controlled wind speed is set as the second controlled wind speed.
According to the S190, when the temperature of the coil of the heat exchanger is low, the second control air speed of the fan of the indoor unit is high, and when the temperature of the coil of the heat exchanger is high, the second control air speed of the fan is low, so that the influence of damp and hot air on a user can be reduced well, and the user experience is improved.
In a second aspect, the present invention further provides a refrigeration anti-freezing control device for a multi-connected air conditioning system, including:
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the running states of all indoor units connected with an outdoor unit of the multi-connected air conditioning system, and the running states comprise a starting state and a shutdown state;
The second acquisition module is used for acquiring the liquid pipe temperature and the air pipe temperature of the heat exchanger of each indoor unit in the starting state and calculating the temperature difference of the heat exchanger corresponding to each indoor unit in the starting state; the temperature difference of the heat exchanger is the difference between the corresponding air pipe temperature and the corresponding liquid pipe temperature of the indoor unit;
the first calculation module is used for calculating the average temperature of the current liquid tubes of all the indoor units in the starting state; the average liquid pipe temperature is the average liquid pipe temperature corresponding to all indoor units in the starting state;
the first judgment module is used for judging whether the average temperature of the liquid pipe is greater than or equal to a preset lower limit value or not; if yes, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling an electronic expansion valve of the indoor unit meeting the first preset condition to be closed; the method comprises the steps that after the electronic expansion valve is closed, the temperature of a liquid pipe of a heat exchanger of a corresponding indoor unit is obtained in real time, and the electronic expansion valve is opened when the temperature of the liquid pipe is larger than a first preset value; the first preset condition comprises that the duration of the liquid pipe temperature corresponding to the indoor unit is less than a second preset value and the heat exchanger temperature difference is less than a third preset value reaches a preset duration, and the electronic expansion valve is arranged on a refrigerant pipeline of the indoor unit.
It is understood that, for the device provided in the embodiment of the present invention, for the explanation, examples, and beneficial effects of the related contents, reference may be made to the corresponding parts in the foregoing method, and details are not described here.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the apparatus embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this disclosure may be implemented in hardware, software, hardware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.
Claims (10)
1. A refrigeration anti-freezing control method of a multi-connected air conditioning system is characterized by comprising the following steps:
acquiring running states of all indoor units connected with an outdoor unit of the multi-connected air conditioning system, wherein the running states comprise a starting state and a shutdown state;
acquiring the liquid pipe temperature and the gas pipe temperature of the heat exchanger of each indoor unit in the starting state, and calculating the temperature difference of the heat exchanger corresponding to each indoor unit in the starting state; the temperature difference of the heat exchanger is the difference between the corresponding air pipe temperature and the corresponding liquid pipe temperature of the indoor unit;
calculating the average temperature of the current liquid tubes of all indoor units in a starting state; the average liquid pipe temperature is the average liquid pipe temperature corresponding to all indoor units in the starting state;
judging whether the average temperature of the liquid pipe is greater than or equal to a preset lower limit value or not;
if yes, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling an electronic expansion valve of the indoor unit meeting the first preset condition to be closed; the method comprises the steps that after the electronic expansion valve is closed, the temperature of a liquid pipe of a heat exchanger of a corresponding indoor unit is obtained in real time, and the electronic expansion valve is opened when the temperature of the liquid pipe is larger than a first preset value;
The first preset condition comprises that the duration of the liquid pipe temperature corresponding to the indoor unit is less than a second preset value and the heat exchanger temperature difference is less than a third preset value reaches a preset duration, and the electronic expansion valve is arranged on a refrigerant pipeline of the indoor unit.
2. The method of claim 1, further comprising:
if the average temperature of the liquid pipes is lower than the preset lower limit value, controlling a compressor of an outdoor unit of the multi-connected air-conditioning system to enter a frequency raising stopping mode, and opening an air bypass valve arranged between an exhaust port and a return port of the compressor; after entering the stop audio frequency mode and opening the air bypass valve, acquiring the liquid pipe temperatures of the heat exchangers of all indoor units in a starting state in real time, calculating the average liquid pipe temperatures of all indoor units, and controlling the compressor to exit the stop frequency increasing mode and close the air bypass valve when the average liquid pipe temperature is greater than a preset upper limit value;
judging whether each indoor unit in a starting state meets a first preset condition or not, and controlling an electronic expansion valve of the indoor unit meeting the first preset condition to be closed; and acquiring the temperature of a liquid pipe of the heat exchanger corresponding to the indoor unit in real time after the electronic expansion valve is closed, and opening the electronic expansion valve when the temperature of the liquid pipe is greater than a first preset value.
3. The method of claim 1, wherein the obtaining of the liquid pipe temperature and the gas pipe temperature of the heat exchanger of each indoor unit in the on state comprises: and acquiring the liquid pipe temperature and the air pipe temperature of the heat exchanger of each indoor unit in the starting state through the NTC sensor.
4. The method of claim 1, wherein the outdoor unit communicates with each indoor unit through an MM1192 chip.
5. The method of claim 1, further comprising:
acquiring the room temperature and the indoor coil temperature of each indoor unit in a starting state, and controlling the indoor units meeting the second preset condition to enter an anti-condensation protection mode; the second preset condition comprises that the room temperature is greater than a fourth preset value and the temperature of the indoor coil is less than or equal to a fifth preset value, or the room temperature is less than or equal to the fourth preset value and is greater than a sixth preset value and the temperature of the indoor coil is less than or equal to a seventh preset value; wherein the fourth preset value, the sixth preset value, the fifth preset value and the seventh preset value are decreased in sequence.
6. The method of claim 5, further comprising:
Controlling the indoor unit which does not meet the second preset condition to enter a normal wind speed control mode;
the method comprises the following steps of acquiring a user set temperature for an indoor unit entering a normal wind speed control mode, and determining a corresponding first control wind speed according to the user set temperature and the room temperature, wherein the method specifically comprises the following steps: if the room temperature is greater than the user set temperature and the difference between the room temperature and the user set temperature is greater than an eighth preset value, the first control wind speed is the user set wind speed; if the room temperature is greater than the user set temperature, and the difference between the room temperature and the user set temperature is less than or equal to the eighth preset value and greater than a ninth preset value, the first control wind speed is not higher than the wind speed corresponding to the medium-speed wind gear and not higher than the user set wind speed; if the room temperature is greater than the user set temperature and the difference between the room temperature and the user set temperature is less than or equal to the ninth preset value, the first control wind speed is not higher than the wind speed corresponding to the low-speed wind gear and not higher than the user set wind speed; if the room temperature is less than or equal to the temperature set by the user, the first control wind speed is the wind speed corresponding to the breeze level;
The method comprises the steps of obtaining the coil temperature of a heat exchanger in the indoor unit, determining the relation between the coil temperature and a preset temperature interval, determining a second control air speed according to the relation and the first control air speed, and sending the second control air speed to the corresponding indoor unit so that the indoor unit can control the air speed of an air-conditioning fan according to the second control air speed.
7. The method of claim 6, wherein determining a second control wind speed based on the relationship and the first control wind speed comprises:
if the temperature of the coil pipe of the heat exchanger is smaller than the minimum value of the preset temperature interval, taking the first control wind speed as a second control wind speed;
if the temperature of the coil pipe of the heat exchanger is within the preset temperature range, the second control wind speed is less than or equal to the first control wind speed, and the second control wind speed cannot exceed the wind speed corresponding to the medium-speed gear;
and if the temperature of the coil pipe of the heat exchanger is greater than the maximum value of the preset temperature interval, the second control wind speed is less than or equal to the first control wind speed, and the second control wind speed cannot exceed the wind speed corresponding to the low-speed wind gear.
8. The method of claim 7, wherein if the coil temperature of the heat exchanger is within the preset temperature range, the second controlled wind speed is less than or equal to the first controlled wind speed, and the second controlled wind speed cannot exceed a wind speed corresponding to a medium-speed gear, and the method comprises:
if the first control wind speed is a wind speed corresponding to a strong wind shield or a high-speed wind shield, the second control wind speed is a wind speed corresponding to a medium-speed wind shield;
and if the first control wind speed is less than or equal to the wind speed corresponding to the medium-speed gear, taking the first control wind speed as a second control wind speed.
9. The method of claim 7, wherein if the coil temperature of the heat exchanger is greater than the maximum value of the preset temperature interval, the second control wind speed is less than or equal to the first control wind speed, and the second control wind speed cannot exceed a wind speed corresponding to a low-speed wind gear, and the method comprises:
if the first control wind speed is the wind speed corresponding to a strong wind gear, a high-speed wind gear or a medium-speed wind gear, the second control wind speed is the wind speed corresponding to a low-speed wind gear;
and if the first control wind speed is less than or equal to the wind speed corresponding to the low-speed gear, taking the first control wind speed as a second control wind speed.
10. A refrigeration anti-freezing control device of a multi-connected air conditioning system is characterized in that,
the system comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the running states of all indoor units connected with an outdoor unit of the multi-connected air conditioning system, and the running states comprise a starting state and a shutdown state;
the second acquisition module is used for acquiring the liquid pipe temperature and the air pipe temperature of the heat exchanger of each indoor unit in the starting state and calculating the temperature difference of the heat exchanger corresponding to each indoor unit in the starting state; the temperature difference of the heat exchanger is the difference between the corresponding air pipe temperature and the corresponding liquid pipe temperature of the indoor unit;
the first calculation module is used for calculating the average temperature of the current liquid tubes of all the indoor units in the starting state; the average liquid pipe temperature is the average liquid pipe temperature corresponding to all indoor units in the starting state;
the first judgment module is used for judging whether the average temperature of the liquid pipe is greater than or equal to a preset lower limit value or not; if yes, judging whether each indoor unit in the starting state meets a first preset condition or not, and controlling an electronic expansion valve of the indoor unit meeting the first preset condition to be closed; the method comprises the steps that after the electronic expansion valve is closed, the temperature of a liquid pipe of a heat exchanger of a corresponding indoor unit is obtained in real time, and the electronic expansion valve is opened when the temperature of the liquid pipe is larger than a first preset value; the first preset condition comprises that the duration of the liquid pipe temperature corresponding to the indoor unit is less than a second preset value and the heat exchanger temperature difference is less than a third preset value reaches a preset duration, and the electronic expansion valve is arranged on a refrigerant pipeline of the indoor unit.
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| CN114754467A (en) * | 2022-02-28 | 2022-07-15 | 青岛海尔空调电子有限公司 | Control method of multi-split system |
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