CN112984707B - Refrigeration control method of multi-connected indoor unit air conditioner, air conditioner and application - Google Patents

Refrigeration control method of multi-connected indoor unit air conditioner, air conditioner and application Download PDF

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Publication number
CN112984707B
CN112984707B CN202110334369.6A CN202110334369A CN112984707B CN 112984707 B CN112984707 B CN 112984707B CN 202110334369 A CN202110334369 A CN 202110334369A CN 112984707 B CN112984707 B CN 112984707B
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controlling
compressor
suction pressure
machine
average value
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CN112984707A (en
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夏维倩
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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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
    • F24F11/32—Responding to malfunctions or emergencies
    • 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
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • 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
    • 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
    • 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
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • 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
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention provides a refrigeration control method of a multi-connected indoor unit air conditioner, the air conditioner and application, wherein the refrigeration control method of the multi-connected indoor unit air conditioner comprises the following steps: obtaining a temperature value T reached by a heat exchanger of each internal machine within preset time hex (ii) a According to the T of each internal machine hex And a preset temperature value T s Judging that each internal machine is a long branch pipe internal machine or a short branch pipe internal machine; and when the plurality of inner machines comprise a long branch pipe inner machine and a short branch pipe inner machine, controlling the compressor to operate under a target suction pressure value.

Description

Refrigeration control method of multi-connected indoor unit air conditioner, air conditioner and application
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigeration control method of a multi-connected indoor unit air conditioner, a refrigeration control device of the multi-connected indoor unit air conditioner, the air conditioner and a readable storage medium.
Background
In a multi-room type air conditioner, if the difference in the length of the branch pipes between the respective internal machines is too large, the pressure loss of the air pipe branch pipe of the internal machine having the long branch pipe increases, so that the pressure loss of the internal and external air pipes increases, resulting in an increase in the evaporation pressure; resulting in an increase in the evaporation temperature and a lack of cooling capacity.
Disclosure of Invention
The invention aims to prevent the insufficient refrigerating capacity of an inner machine with a long branch pipe.
To realizeIn order to achieve the above object, an embodiment of the present invention provides a refrigeration control method for a multi-split indoor unit air conditioner, including: obtaining a temperature value T reached by a heat exchanger of each internal machine within preset time hex (ii) a According to the T of each internal machine hex And a preset temperature value T s Judging whether each internal machine is a long branch pipe internal machine or a short branch pipe internal machine; and when the plurality of inner machines comprise a long branch pipe inner machine and a short branch pipe inner machine, controlling the compressor to operate at a target suction pressure value.
Compared with the prior art, the technical effect that this embodiment can reach is: whether a long branch distribution pipe internal machine exists or not can be judged through the temperature of the evaporator of each internal machine, and when the long branch distribution pipe internal machine and the short branch distribution pipe internal machine exist, the short branch distribution pipe internal machine simultaneously enters a warm shutdown state in advance by controlling the compressor to operate under a target air suction pressure value, so that the long branch distribution pipe internal machine is ensured to have sufficient refrigerating capacity, and the defect of insufficient refrigerating capacity of the long branch distribution pipe internal machine is avoided.
In an alternative embodiment, said T according to each said internal machine hex And a preset temperature value T s The method for judging whether each internal machine is a long branch pipe internal machine or a short branch pipe internal machine comprises the following steps: determining the T of each internal machine hex Whether or not to make T hex >T s If true; when the indoor units are established, judging that the corresponding indoor units are long branch pipe indoor units; and when the internal machine is not in the set state, judging that the corresponding internal machine is a short branch pipe internal machine.
It can be understood that the temperature value T of the heat exchanger of the internal machine is hex Greater than a preset temperature value T s When the short branch pipe is connected with the internal machine, the internal machine of the corresponding table is a long branch pipe internal machine, otherwise, the internal machine of the corresponding table is a short branch pipe internal machine.
In an alternative embodiment, when the plurality of internal machines include a long branch pipe internal machine and a short branch pipe internal machine, the controlling the compressor to operate at the target suction pressure value includes: calculating the T of a long bifurcation indoor unit hex Average value C of (1); the average value C is in different temperature ranges, and the suction pressure of the compressor is controlled to be different(ii) a Wherein the larger the average value C, the lower the suction pressure accordingly.
It will be appreciated that by calculating the T of a long branch manifold internal unit hex The average value C is used for determining the corresponding suction pressure of the compressor, so that the revolution of the compressor is controlled, and the refrigerating capacity of each internal machine is improved.
In an alternative embodiment, the method further comprises: obtaining the average value C; when the average value C is higher than 12 ℃ and higher than or equal to 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.03-0.07MPa; when the average value C is higher than 14 ℃ and higher than or equal to 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.08-0.12MPa; when the average value C is higher than 16 ℃ and higher than or equal to 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.13-0.17MPa; and when the average value C is greater than or equal to 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.18-0.22MPa.
It can be understood that the average value C is set to be in different temperature ranges, so that the suction pressure of the compressors in different ranges is corresponded, the rotating speed of the compressors under different conditions can be adjusted conveniently and accurately, and the refrigerating capacity of each internal unit is improved effectively.
In an alternative embodiment, the method further comprises: and when part of the short branch pipe internal machines in all the short branch pipe internal machines reach the preset refrigeration temperature, controlling the part of the short branch pipe internal machines to enter a weak refrigeration mode.
As can be understood, when a part of short branch distribution pipe internal machines reach a preset refrigeration temperature, the part of short branch distribution pipe internal machines are controlled to enter a weak refrigeration mode, on one hand, the phenomenon that the number of the internal machines in refrigeration operation is reduced due to the fact that the part of short branch distribution pipe internal machines enter a warm shutdown mode, the rotating speed of an external machine fan is reduced, and further the evaporation temperature of the long branch distribution pipe internal machines is increased is avoided; on the other hand, to maintain room temperature.
In an alternative embodiment, the weak cooling mode includes: reducing the opening degree of an internal machine expansion valve; and/or increasing the degree of superheat of the air pipe of the indoor unit heat exchanger.
As can be understood, the opening degree of the indoor unit expansion valve is reduced and/or the degree of superheat of the air pipe of the indoor unit heat exchanger is increased so as to control the corresponding indoor unit to enter the weak cooling mode.
In an alternative embodiment, the method further comprises: and when all the short branch pipe internal machines reach the preset refrigeration temperature, controlling all the short branch pipe internal machines to enter a warm shutdown mode.
As can be understood, when all the short branch pipe internal machines reach the preset refrigeration temperature, all the short branch pipe internal machines are controlled to enter a warm shutdown mode; to ensure that only long branch pipe internal machines remain operational.
In an optional embodiment, when all the short branch pipe internal units reach a preset cooling temperature, a temperature value T of a heat exchanger of each long branch pipe internal unit is obtained hex ', calculating said T hex ' average value C ', controlling the compressor to operate at a target suction pressure value according to the average value C ';
when the average value C 'is higher than 12 ℃ and higher than C' and higher than or equal to 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.13-0.17MPa;
when the average value C 'is higher than 14 ℃ and higher than C' and higher than 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.18-0.22MPa;
when the average value C 'is higher than 16 ℃ and higher than C' and higher than 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.23-0.27MPa;
and when the average value C' is equal to or more than 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.28-0.32MPa.
It can be understood that by controlling the suction pressure of the compressor according to the average value C', the rise of the evaporation temperature is suppressed in correspondence with the increase of the rotation speed of the compressor, thereby ensuring a sufficient cooling capacity of the indoor unit of the long branch pipe.
In an alternative embodiment, the method further comprises: and when all the short branch pipe internal machines reach the preset refrigeration temperature, reducing the target exhaust pressure.
It can be understood that when all the short branch distribution pipe internal machines reach the preset refrigeration temperature, all the short branch distribution pipe internal machines are controlled to simultaneously enter a warm shutdown mode; at the moment, the target exhaust pressure of the fan is reduced by increasing the rotating speed of the fan, so that the pressure loss of a main pipe caused by the fact that the short branch pipe internal machine stops at a warm state is reduced, the evaporation temperature rise caused by the increase of the pressure loss of an internal and external machine connecting pipe is avoided, and the long branch pipe internal machine has sufficient refrigerating capacity.
The invention also provides a refrigeration control device of the multi-connected indoor unit air conditioner, which comprises: a receiving module for obtaining the temperature value T reached by the heat exchanger of each internal machine within the preset time hex (ii) a A judging module for judging the T of each internal machine hex And a preset temperature value T s Judging whether each internal machine is a long branch pipe internal machine or a short branch pipe internal machine; and the control module is used for controlling the compressor to operate under a target suction pressure value when the plurality of inner machines comprise a long branch pipe inner machine and a short branch pipe inner machine.
The present invention also provides an air conditioner including: the system comprises an outer machine and a plurality of inner machines connected with the outer machine; the outdoor unit is provided with a readable storage medium storing a computer program and a package IC electrically connected to the readable storage medium, and when the computer program is read and executed by the package IC, the air conditioner implements the refrigeration control method according to any one of the embodiments.
The invention also provides a readable storage medium, wherein the readable storage medium stores computer-executable instructions, and when the computer-executable instructions are read and executed by a processor, the readable storage medium controls an air conditioner where the readable storage medium is located to realize the refrigeration control method in any one of the above embodiments.
The invention has the following beneficial effects:
1) The short branch pipe internal unit and the long branch pipe internal unit can be determined according to the evaporation temperature of each internal unit;
2) If the long branch distribution pipe indoor unit exists, the long branch distribution pipe indoor unit can be ensured to have sufficient refrigerating capacity, and the refrigerating capacity of the long branch distribution pipe indoor unit is prevented from being insufficient;
3) The short branch distribution pipe inner machine which meets the warm shutdown condition firstly can be controlled to enter a weak refrigeration mode, on one hand, the phenomenon that the evaporation temperature of the long branch distribution pipe inner machine is increased due to the fact that the number of the inner machines in refrigeration operation is reduced because part of the short branch distribution pipe inner machines enter the warm shutdown mode and the rotating speed of an outer machine fan is reduced is avoided; on the other hand, to maintain room temperature;
4) When all the short branch distribution pipe inner machines simultaneously enter a warm shutdown mode, the target exhaust pressure is reduced by improving the rotating speed of the fan, so that the pressure loss of the main distribution pipe caused by the warm shutdown of the short branch distribution pipe inner machines is reduced, the evaporation temperature rise caused by the increase of the pressure loss of the inner and outer machine connecting pipes is avoided, and the long branch distribution pipe inner machines have sufficient refrigerating capacity.
Drawings
Fig. 1 is a flowchart of a refrigeration control method according to a first embodiment of the present invention;
FIG. 2 is a detailed flowchart of step 120 of FIG. 1;
fig. 3 is a flowchart of a specific implementation of the refrigeration control method according to a first embodiment of the present invention;
fig. 4 is a block diagram schematically illustrating a structure of a refrigeration control device 300 according to a second embodiment of the present invention;
fig. 5 is a block diagram of an air conditioner 400 according to a third embodiment of the present invention;
fig. 6 is a schematic diagram illustrating the operation of each internal unit when the air conditioner 400 according to the third embodiment of the present invention executes the refrigeration control method according to the first embodiment;
fig. 7 is a schematic structural diagram of a storage medium 500 according to a fourth embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
[ first embodiment ] A method for manufacturing a semiconductor device
Referring to fig. 1, an embodiment of the present invention provides a refrigeration control method for a multiple indoor unit air conditioner, including the following steps:
s110: obtaining the preset condition of the heat exchanger of each internal machineTemperature value T reached in time hex 。
Note that, the temperature value T hex Detecting the temperature of the heat exchanger after the internal machine runs for a preset time from starting up and refrigerating; the temperature value T of the heat exchanger can be obtained by arranging the temperature sensor at the heat exchanger of the internal machine hex 。
S120: according to the T of each internal machine hex And a preset temperature value T s And (4) judging that each internal machine is a long branch pipe internal machine or a short branch pipe internal machine.
If the difference in the length of the branch pipe between the respective internal machines is too large, the pressure loss of the air pipe branch pipe of the internal machine having a long branch pipe increases, the pressure loss of the inner and outer air pipes increases, the evaporation pressure increases, and the temperature value T of the heat exchanger of the internal machine having a long branch pipe, that is, the long branch pipe internal machine, increases hex Temperature value T of heat exchanger relative to short branch pipe indoor unit hex The difference is large, therefore, after the operation for the preset time, the temperature values T of the heat exchangers of the internal machines are compared hex And a preset temperature value T s The relationship (c) can determine whether each of the indoor units is a long-tap indoor unit or a short-tap indoor unit.
It should be further noted that the long branch pipe indoor unit or the short branch pipe indoor unit is relatively, that is, when there is a difference in length between the branch pipes connecting the indoor units, there is a difference between the long branch pipe indoor unit and the short branch pipe indoor unit.
S130: and when the plurality of inner machines comprise a long branch pipe inner machine and a short branch pipe inner machine, controlling the compressor to operate at a target suction pressure value.
It should be noted that, if the length difference of the branch pipes connecting the respective internal machines is not large, there is no branch between the internal machine of the long branch pipe and the internal machine of the short branch pipe, and the compressor does not need to be controlled to operate at the target suction pressure value; only when the plurality of internal machines comprise a long branch distribution pipe internal machine and a short branch distribution pipe internal machine, the compressor needs to be controlled to operate under the target suction pressure value, and the refrigerating capacity of each internal machine is improved.
Further, referring to fig. 2, the S120 includes, for example:
s121, judging T of each internal unit hex Whether or not to make T hex >T s If true;
s122, when the indoor unit is established, judging that the corresponding indoor unit is a long branch pipe indoor unit;
and S123, when the indoor unit is not established, judging that the corresponding indoor unit is a short branch pipe indoor unit.
For example, assume a preset temperature value T s At 10 ℃, comparing T of the heat exchanger of each internal machine after the internal machine is started and operates for a preset time hex And if the temperature is higher than 10 ℃, the corresponding inner machine is a long branch pipe inner machine if the temperature is higher than 10 ℃, and otherwise, the corresponding inner machine is a short branch pipe inner machine.
Further, the S130 includes, for example:
s131, judging whether a long branch pipe indoor unit and a short branch pipe indoor unit exist.
It should be noted that only T when a heat exchanger is present hex Greater than a preset temperature value T s E.g. T with internal machine corresponding to 10 deg.C and heat exchanger hex The temperature of the indoor unit is lower than 10 ℃, and the temperature of the indoor unit higher than 10 ℃ is the indoor unit of the long branch pipe; the corresponding inner machine with the temperature less than or equal to 10 ℃ is a short branch pipe inner machine.
E.g. if T of the heat exchangers of all internal machines hex Both of which are greater than or equal to 10 ℃, there is no branching between the short branch pipe internal unit and the long branch pipe internal unit.
Further, the S130, for example, further includes:
s132, calculating the T of the long branch distribution pipe indoor unit hex Average value C of (1); controlling the suction pressure of the compressor to be different when the average value C is in different temperature ranges; wherein the larger the average value C, the lower the suction pressure accordingly.
The controller sets the internal unit based on the T of all the long branches hex Calculating to obtain an average value C, and controlling the suction pressure of the compressor not to be higher according to the difference of the range of the average value CMeanwhile, the rotating speed of the compressor is reasonably controlled, energy consumption is saved, and meanwhile the refrigerating capacity of each internal machine is improved.
Further, referring to fig. 3, the S130 further includes, for example:
s133, acquiring the average value C; when the average value C is higher than 12 ℃ and higher than or equal to 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.03-0.07MPa; when the average value C is higher than 14 ℃ and higher than or equal to 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.08-0.12MPa; when the average value C is higher than 16 ℃ and higher than or equal to 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.13-0.17MPa; and when the average value C is greater than or equal to 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.18-0.22MPa.
In the actual operation process, the average value C can be obtained by calculation of a controller, and when the average value C is higher than 12 ℃ and higher than or equal to 10 ℃, the suction pressure value of the compressor is controlled to be reduced by 0.05MPa; when the average value C is higher than 14 ℃ and higher than or equal to 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.10MPa; when the average value C is higher than 16 ℃ and higher than or equal to 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.15MPa; and when the average value C is greater than or equal to 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.20MPa.
Further, referring to fig. 3, the refrigeration control method further includes S140: whether all the short branch pipe internal machines meet the warm shutdown condition or not.
Further, the method further comprises the step S150: and when part of the short branch distribution pipe indoor units in all the short branch distribution pipe indoor units reach the preset refrigeration temperature, controlling the part of the short branch distribution pipe indoor units to enter a weak refrigeration mode.
It can be understood that when the air suction pressure of the compressor is controlled to increase the rotating speed of the compressor due to the existence of the long branch pipe internal unit, the refrigerating capacity of each internal unit is correspondingly improved; at this time, part of the short branch distribution pipe internal machines in the short branch distribution pipe internal machines can reach the preset refrigeration temperature in advance, and in order to avoid the problem that the evaporation temperature of the long branch distribution pipe internal machine rises due to the fact that the rotating speed of an external machine fan is reduced due to the fact that the number of the internal machines in refrigeration operation is reduced, the short branch distribution pipe internal machines reaching the preset refrigeration temperature in advance are controlled to enter a weak refrigeration mode to maintain the rotating speed of the external machine fan, and therefore the problem that the evaporation temperature of the long branch distribution pipe internal machine rises and the refrigeration capacity is insufficient is avoided.
In one particular embodiment, the weak cooling mode includes: reducing the opening degree of an internal machine expansion valve; and/or increasing the degree of superheat of an air pipe of the inner machine heat exchanger.
As can be understood, the flow rate of the refrigerant flowing through the expansion valve is reduced by reducing the opening degree of the expansion valve of the internal machine, so that the corresponding internal machine enters a weak cooling mode to maintain the room temperature; in a similar way, the degree of superheat of the air pipe of the heat exchanger of the indoor unit is increased to reduce the refrigeration efficiency, so that the indoor unit enters a weak refrigeration mode to maintain the room temperature.
Further, the method further includes step S160: and when all the short branch pipe internal machines reach the preset refrigeration temperature, controlling all the short branch pipe internal machines to enter a warm shutdown mode.
It should be noted that, when all the short branch pipe internal machines enter the warm shutdown mode, only the long branch pipe internal machines still keep the cooling operation. In order to ensure the refrigerating comfort, if the short branch distribution pipe inner machine with the overhigh room temperature appears, the corresponding short branch distribution pipe inner machine is released to a warm shutdown mode, and the refrigerating mode is carried out again.
Further, the method further comprises the step S170: when all the short branch pipe internal machines reach the preset refrigeration temperature, obtaining the temperature value T of the heat exchanger of each long branch pipe internal machine hex ', calculating said T hex 'controlling the compressor to operate at a target suction pressure value according to the average value C'; when the average value C 'is higher than 12 ℃ and higher than C' and higher than or equal to 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.13-0.17MPa; when the average value C 'is higher than 14 ℃ and higher than C' and higher than 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.18-0.22MPa; when the average value C 'is higher than 16 ℃ and higher than C' and higher than 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.23-0.27MPa; and when the average value C' is equal to or more than 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.28-0.32MPa.
In the actual operation process, the temperature value T of the heat exchanger is obtained through the temperature sensor in each long branch pipe internal unit hex ' and transmitted to the controller, and the controller calculates the moment T hex 'average value C'; and then correspondingly controlling the suction pressure of the compressor according to the average value C', so as to reasonably control the rotating speed of the compressor and further improve the refrigerating capacity of each internal machine. For example, when the average value C 'is more than 12 ℃ and more than C' and more than 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.15MPa; when the average value C 'is higher than 14 ℃ and higher than C' and is higher than or equal to 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.20MPa; when the average value C' is more than 16 ℃ and more than or equal to 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.25MPa; and when the average value C 'is positioned at C' or more than 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.30MPa.
Further, the method further comprises step S180: and when all the short branch pipe indoor units reach the preset refrigeration temperature, reducing the target exhaust pressure.
It should be noted that the target exhaust pressure of the fan is reduced by increasing the fan rotation speed, and then the increase of the evaporation temperature is suppressed, and the cooling capacity of the long branch pipe internal unit is improved.
Further, the method also comprises the following steps:
s190: judging whether a short branch distribution pipe internal machine reenters a refrigeration mode;
s191: if not, the operation is not carried out;
if yes, go to step S132.
[ second embodiment ]
Referring to fig. 4, an embodiment of the present invention further provides a refrigeration control apparatus 300 of a multiple indoor unit air conditioner, for example, including: a receiving module 310, configured to obtain a temperature value T reached by the heat exchanger of each internal unit within a preset time hex (ii) a A judging module 320, configured to determine the T of each internal machine hex And a preset temperature value T s Judging whether each internal machine is a long branch pipe internal machine or a short branch pipe internal machine; a control module 330 for including in a plurality of said internal machinesAnd when the long branch distribution pipe indoor unit and the short branch distribution pipe indoor unit are used, the compressor is controlled to operate under the target suction pressure value.
In a specific embodiment, the receiving module 310, the determining module 320 and the control module 330 of the refrigeration control apparatus 300 cooperate to implement the refrigeration control method described in the first embodiment, and are not described herein again.
[ third embodiment ] A
Referring to fig. 5, an embodiment of the present invention further provides an air conditioner 400, including: an outer unit 410 and a plurality of inner units connected to the outer unit 410; the plurality of internal units include, for example, a first internal unit 421, a second internal unit 422, a third internal unit 423, a fourth internal unit 424, and the like, the external unit 410 is provided with a readable storage medium storing a computer program, and a package IC electrically connected to the readable storage medium, and when the computer program is read by the package IC and executed, the air conditioner implements the refrigeration control method according to the first embodiment.
In one embodiment, the main pipe is connected to the external unit 410, and a branch pipe is connected between the main pipe and each internal unit; referring to fig. 5, the branch pipe lengths connected between the first and fourth inner machines 421 and 424 and the main pipe are significantly longer than the branch pipe lengths connected to the second and third inner machines 422 and 423; this causes an excessive difference in the length of the branch pipe between the respective internal units. At this time, each internal machine starts a cooling mode, and runs for a preset time, for example, after 5 minutes:
1) Detecting and acquiring temperature value T reached by heat exchanger of each internal machine hex ；
2) At this time, T of each internal unit is judged hex And a preset temperature value T s E.g. predetermined temperature value T s The temperature value T of the first internal machine 421, the second internal machine 422, the third internal machine 423 and the fourth internal machine 424 is respectively determined when the temperature value T is 10 ℃ hex Whether the temperature is higher than 10 ℃, the evaporation pressure is increased due to the increase of the pressure loss of the branch pipes of the first and fourth inner machines 421 and 424 having long branch pipes, which increases the pressure loss of the inner and outer air pipes, and thus the temperature values T of the first and fourth inner machines 421 and 424 hex Compared with the second inner machine 422 and the third inner machineTemperature value T of the internal machine 423 hex To be large, in other words, when T of the first and fourth inner banks 421, 424 is detected hex The temperature values T of the second inner machine 422 and the third inner machine 423 are higher than 10 DEG C hex Less than or equal to 10 ℃; therefore, the first and fourth internal machines 421 and 424 are determined to be long branch pipe internal machines; the second and third indoor units 422 and 423 are short branch pipe indoor units;
3) And controlling the first inner machine 421, the second inner machine 422, the third inner machine 423 and the fourth inner machine 424 to normally cool. At this time, T of the first and fourth inner units 421 and 424 is also calculated by the controller provided in the outer unit 410 hex And controlling the compressor to generate different suction pressures according to the average value C in different temperature ranges. For example, the average value C is 10.5 ℃, and the condition that the temperature is 12 ℃ is more than C which is more than or equal to 10 ℃ is met; the controller correspondingly controls the suction pressure value of the compressor to be reduced by 0.05MPa, and the rotating speed of the compressor is increased.
4) Referring to fig. 6, when the second inner unit 422 reaches the preset cooling temperature of 18 ℃ and the third inner unit 423 is not reached, the second inner unit 422 is controlled to enter the weak cooling mode. When the third inner machine 423 also reaches the preset refrigeration temperature of 18 ℃, all the short inner machines reach the preset refrigeration temperature at the moment, and the second inner machine 422 and the third inner machine 423 are controlled to simultaneously enter a warm shutdown mode;
5) At this time, the first and fourth inner machines 421 and 424 cool normally. The controller acquires and calculates T of the first and fourth inner units 421 and 424 again hex Average value of (C). For example, the average value C 'is 10 ℃ and 12 ℃ C. > C'. Gtoreq.10 ℃ is satisfied; the controller correspondingly controls the suction pressure value of the compressor to be reduced by 0.15MPa, and the rotating speed of the compressor C is further improved. At this time, the refrigeration capacities of the first and fourth internal machines 421 and 424 are sufficient, and the ambient temperature of the internal machines is rapidly reduced;
6) The target exhaust pressure of the fan is reduced by increasing the rotating speed of the fan, so that the refrigerating capacities of the first inner machine 421 and the fourth inner machine 424 are further increased until the temperature is reached, and the machine is stopped;
7) Judging whether the second indoor unit 422 or the third indoor unit 423 reenters the refrigeration mode; if yes, the T of the long branch pipe in the cooling operation mode is acquired again hex And meterCalculating the average value, that is, if the second inner machine 422 is operated again at this time, the first inner machine 421 has come to a warm stop, and only the fourth inner machine 424 is operated, obtaining the T for calculating the fourth inner machine 424 hex The average value is obtained, the step 3) is carried out downwards, and the circulation is carried out to improve the refrigeration comfort level for users; if the first inner machine 421 and the fourth inner machine 424 are not restarted at this time, as shown in fig. 6, the third inner machine 423 and the second inner machine 422 enter the refrigeration mode again, when the third inner machine 423 reaches the preset refrigeration temperature of 18 ℃ again, the weak refrigeration mode is entered, until the second inner machine 422 reaches the preset refrigeration temperature of 18 ℃, the warm shutdown mode is entered at the same time, all the inner machines are executed in a reciprocating manner, and the refrigeration comfort level is improved for users.
[ fourth example ] A
Referring to fig. 7, the present embodiment further provides a readable storage medium 500, where the readable storage medium 500 stores computer-executable instructions 510, and when the computer-executable instructions 510 are read and executed by a processor, the readable storage medium 500 controls an air conditioner to implement the refrigeration control method as described in the first embodiment.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. A refrigeration control method of a multi-connected indoor unit air conditioner is characterized by comprising the following steps:
acquiring a temperature value Thex reached by a heat exchanger of each internal machine within preset time;
according to the magnitude relation between Thex and preset temperature value Ts of each internal machine, each internal machine is judged to be a long-branch pipe internal machine or a short-branch pipe internal machine, and the method comprises the following steps:
judging whether Thex of each internal machine enables Thex to be more than Ts;
when the indoor units are established, judging that the corresponding indoor units are long branch pipe indoor units;
when the internal machine is not in the set state, judging that the corresponding internal machine is a short branch pipe internal machine;
when the plurality of inner machines comprise a long branch pipe inner machine and a short branch pipe inner machine, controlling the compressor to operate under a target suction pressure value;
when part of the short branch distribution pipe internal machines in all the short branch distribution pipe internal machines reach the preset refrigeration temperature, controlling the part of the short branch distribution pipe internal machines to enter a weak refrigeration mode;
the weak cooling mode includes:
reducing the opening degree of an internal machine expansion valve; and/or the presence of a gas in the atmosphere,
the degree of superheat of an air pipe of the inner machine heat exchanger is increased;
when all the short branch pipe indoor units reach the preset refrigeration temperature, obtaining the temperature value Thex 'of the heat exchanger of each long branch pipe indoor unit, calculating the average value C' of the Thex ', and controlling the compressor to operate under the target suction pressure value according to the average value C';
when the average value C 'is higher than 12 ℃ and higher than C' and higher than or equal to 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.13-0.17MPa;
when the average value C 'is higher than 14 ℃ and higher than C' and higher than 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.18-0.22MPa;
when the average value C 'is higher than 16 ℃ and higher than C' and higher than 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.23-0.27MPa;
and when the average value C 'is positioned at C' being more than or equal to 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.28-0.32MPa.
2. The refrigeration control method according to claim 1, wherein the controlling of the compressor to operate at a target suction pressure value when the plurality of the indoor units include a long-branch indoor unit and a short-branch indoor unit includes:
calculating an average value C of the Thex of the indoor unit of the long branch pipe;
controlling the suction pressure of the compressor to be different when the average value C is in different temperature ranges;
wherein the larger the average value C, the lower the suction pressure accordingly.
3. The refrigeration control method according to claim 2, further comprising:
obtaining the average value C;
when the average value is more than 12 ℃ and C is more than or equal to 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.03-0.07MPa;
when the average value C is higher than 14 ℃ and higher than or equal to 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.08-0.12MPa;
when the average value C is higher than 16 ℃ and higher than or equal to 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.13-0.17MPa;
and when the average value C is greater than or equal to 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.18-0.22MPa.
4. The refrigeration control method according to claim 1, further comprising:
and when all the short branch distribution pipe internal machines reach the preset refrigeration temperature, controlling all the short branch distribution pipe internal machines to enter a warm shutdown mode.
5. The refrigeration control method according to claim 1, further comprising:
and when all the short branch pipe indoor units reach the preset refrigeration temperature, reducing the target exhaust pressure.
6. The utility model provides a refrigeration controlling means of many online indoor set air conditioners which characterized in that includes:
the receiving module is used for acquiring a temperature value Thex reached by the heat exchanger of each internal machine within preset time;
the judging module is used for judging that each internal machine is a long bifurcation internal machine or a short bifurcation internal machine according to the size relation between Thex of each internal machine and a preset temperature value Ts, and comprises:
judging whether Thex of each internal machine enables Thex to be more than Ts;
when the indoor units are established, judging that the corresponding indoor units are long branch pipe indoor units;
when the internal machine is not in the set state, judging that the corresponding internal machine is a short branch pipe internal machine;
the control module is used for controlling the compressor to operate under a target air suction pressure value when the plurality of internal machines comprise a long branch distribution pipe internal machine and a short branch distribution pipe internal machine;
when part of the short branch distribution pipe indoor units in all the short branch distribution pipe indoor units reach a preset refrigeration temperature, controlling the part of the short branch distribution pipe indoor units to enter a weak refrigeration mode;
the weak cooling mode includes:
reducing the opening degree of an internal machine expansion valve; and/or the presence of a gas in the gas,
the degree of superheat of an air pipe of the inner machine heat exchanger is increased;
when all the short branch pipe indoor units reach the preset refrigeration temperature, obtaining the temperature value Thex 'of the heat exchanger of each long branch pipe indoor unit, calculating the average value C' of the Thex ', and controlling the compressor to operate under the target suction pressure value according to the average value C';
when the average value C' is more than 12 ℃ and more than or equal to 10 ℃, controlling the suction pressure value of the compressor to be reduced by 0.13-0.17MPa;
when the average value C 'is higher than 14 ℃ and higher than C' and higher than 12 ℃, controlling the suction pressure value of the compressor to be reduced by 0.18-0.22MPa;
when the average value C' is more than 16 ℃ and more than or equal to 14 ℃, controlling the suction pressure value of the compressor to be reduced by 0.23-0.27MPa;
and when the average value C 'is positioned at C' being more than or equal to 16 ℃, controlling the suction pressure value of the compressor to be reduced by 0.28-0.32MPa.
7. An air conditioner, comprising:
the system comprises an outer machine and a plurality of inner machines connected with the outer machine; the outdoor unit is provided with a readable storage medium storing a computer program and a package IC electrically connected to the readable storage medium, and when the computer program is read and executed by the package IC, the air conditioner implements the refrigeration control method according to any one of claims 1 to 5.
8. A readable storage medium, wherein the readable storage medium stores computer-executable instructions, which when read and executed by a processor, control an air conditioner in which the readable storage medium is located to implement the refrigeration control method according to any one of claims 1 to 5.
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