CN113494764A - Control method of multi-split air conditioner, multi-split air conditioner and storage medium - Google Patents

Control method of multi-split air conditioner, multi-split air conditioner and storage medium Download PDF

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Publication number
CN113494764A
CN113494764A CN202010276689.6A CN202010276689A CN113494764A CN 113494764 A CN113494764 A CN 113494764A CN 202010276689 A CN202010276689 A CN 202010276689A CN 113494764 A CN113494764 A CN 113494764A
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China
Prior art keywords
indoor unit
air conditioner
split air
temperature
preset
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Pending
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CN202010276689.6A
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Chinese (zh)
Inventor
朱天贵
张�浩
黎顺全
雷俊杰
刘群波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Priority to CN202010276689.6A priority Critical patent/CN113494764A/en
Publication of CN113494764A publication Critical patent/CN113494764A/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/70—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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • 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 discloses a control method of a multi-split air conditioner, the multi-split air conditioner comprises an outdoor unit and at least two indoor units, and the control method of the multi-split air conditioner comprises the following steps: if the indoor unit in the standby state is detected, taking the detected indoor unit as a target indoor unit; controlling a throttling device of the target indoor unit to open a preset opening degree, and maintaining a first preset time length; and after the first preset time, controlling the throttling device of the target indoor unit to be closed. The invention also discloses a multi-split air conditioner and a computer readable storage medium. The invention solves the problem of reducing the noise of the multi-split air conditioner under the condition of ensuring the stable operation of the multi-split air conditioner.

Description

Control method of multi-split air conditioner, multi-split air conditioner and storage medium
Technical Field
The invention relates to the technical field of multi-split air conditioners, in particular to a control method of a multi-split air conditioner, the multi-split air conditioner and a computer readable storage medium.
Background
With the development of technology, a multi-split air conditioner in which a plurality of indoor units share one outdoor unit has appeared. When such a multi-split air conditioner is operated, even if there is an indoor unit that has reached a temperature or has been turned off, the outdoor unit still needs to be operated as long as there is an indoor unit that has not reached a temperature. In this case, if the throttle device of the indoor unit which is warmed up or shut down is directly closed, the refrigerant and the compressor oil are accumulated in the indoor unit, thereby causing an unstable air conditioning system, and if the throttle device of the indoor units is kept open, the sound of the refrigerant flow is transmitted through the throttle device, thereby generating noise.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a control method of a multi-split air conditioner, the multi-split air conditioner and a computer readable storage medium, which solve the problem of reducing the noise of the multi-split air conditioner under the condition of ensuring the stable operation of the multi-split air conditioner.
In order to achieve the above object, the present invention provides a control method for a multi-split air conditioner, the multi-split air conditioner comprises an outdoor unit and at least two indoor units, the control method for the multi-split air conditioner comprises the following steps:
if the indoor unit in the standby state is detected, taking the detected indoor unit as a target indoor unit;
controlling a throttling device of the target indoor unit to open a preset opening degree, and maintaining a first preset time length;
and after the first preset time, controlling the throttling device of the target indoor unit to be closed. Optionally, after the step of controlling the throttling device of the target indoor unit to close after the first time period, the method further includes:
acquiring condition judgment factors, wherein the condition judgment factors comprise at least one of the closing time of the throttling device, the exhaust temperature of a compressor of the outdoor unit, the condensation saturation temperature in the multi-split air conditioner and the coil temperature of the indoor unit in the running state;
and controlling the throttling device of the target indoor unit to reopen the preset opening degree when the condition judgment factor is detected to meet the preset condition.
Optionally, the preset condition includes at least one of:
the closing time of the throttling device reaches a second preset time, wherein the second preset time is longer than the first preset time;
the compressor discharge temperature is greater than or equal to a first temperature;
the condensation saturation temperature is greater than or equal to a second temperature;
the coil temperature is greater than or equal to a third temperature.
Optionally, after the step of controlling the throttling device of the target indoor unit to reopen the preset opening degree when it is detected that the condition determining factor satisfies a preset condition, the method further includes:
and after a third preset time, controlling the throttling device of the target indoor unit to be closed, and returning to the step of executing the obtaining condition judgment factor, wherein the third preset time is shorter than the first preset time.
Optionally, before the step of controlling the throttling device of the target indoor unit to open a preset opening and maintain a first preset duration, the method further includes:
acquiring a reference temperature and an inlet temperature of an indoor unit in a running state, wherein the reference temperature is a condensation saturation temperature in the multi-split air conditioner, or the reference temperature is a coil temperature of the indoor unit in the running state;
and determining the preset opening according to the reference temperature and the inlet temperature.
Optionally, the step of determining the preset opening degree according to the reference temperature and the inlet temperature includes:
determining a difference between the reference temperature and the inlet temperature;
determining the opening degree of the throttling device required to be opened to enable the difference value to reach a preset value;
and taking the determined opening degree as the preset opening degree.
Optionally, the standby state includes a warm-up shutdown state and a shutdown state.
Optionally, after the step of detecting the indoor unit in the standby state and taking the detected indoor unit as the target indoor unit, the method further includes:
and reducing the fan rotating speed of the target indoor unit in the temperature-reaching shutdown state to a preset rotating speed.
In order to achieve the above object, the present invention further provides a multi-split air conditioner, including an outdoor unit and at least two indoor units, the multi-split air conditioner including:
the multi-split air conditioner comprises a memory, a processor and a control program of the multi-split air conditioner, wherein the control program of the multi-split air conditioner is stored in the memory and can be operated on the processor, and the control program of the multi-split air conditioner realizes the steps of the control method of the multi-split air conditioner when being executed by the processor.
In order to achieve the above object, the present invention further provides a computer readable storage medium, wherein a control program of the multi-split air conditioner is stored on the computer readable storage medium, and when the control program of the multi-split air conditioner is executed by a processor, the steps of the control method of the multi-split air conditioner are implemented.
According to the control method of the multi-split air conditioner, the multi-split air conditioner and the computer readable storage medium, if the indoor unit in a standby state is detected, the detected indoor unit is used as a target indoor unit; controlling a throttling device of the target indoor unit to open a preset opening degree, and maintaining a first preset time length; and after the first preset time, controlling the throttling device of the target indoor unit to be closed. Therefore, the problem of how to reduce the noise of the multi-split air conditioner under the condition of ensuring the stable operation of the multi-split air conditioner is solved.
Drawings
Fig. 1 is a schematic diagram of a hardware operating environment of a terminal according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a control method of a multi-split air conditioner according to a first embodiment of the present invention;
FIG. 3 is a flow chart illustrating a control method of a multi-split air conditioner according to a second embodiment of the present invention;
FIG. 4 is a flow chart illustrating a control method of a multi-split air conditioner according to a third embodiment of the present invention;
FIG. 5 is a flow chart illustrating a fourth embodiment of a control method for a multi-split air conditioner according to the present invention;
FIG. 6 is a flow chart illustrating a fifth embodiment of a control method for a multi-split air conditioner according to the present invention;
fig. 7 is a schematic structural diagram of a multi-split air conditioner according to an embodiment of a control method of the multi-split air conditioner of the present invention.
The reference numbers illustrate:
Figure BDA0002442475590000031
Figure BDA0002442475590000041
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a control method of a multi-split air conditioner, which solves the problem of reducing the noise of the multi-split air conditioner under the condition of ensuring the stable operation of the multi-split air conditioner.
As shown in fig. 1, fig. 1 is a schematic diagram of a hardware operating environment of a terminal according to an embodiment of the present invention;
the terminal of the embodiment of the invention can be a multi-split air conditioner, and also can be a control terminal or a server for controlling the multi-split air conditioner.
As shown in fig. 1, the terminal may include: a processor 1001, such as a Central Processing Unit (CPU), a memory 1002, and a communication bus 1003. The communication bus 1003 is used for implementing connection communication between the components in the terminal. The memory 1002 may be a random-access memory (RAM-random-access memory) or a non-volatile memory (non-volatile memory), such as a disk memory. The memory 1002 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration of the terminal shown in fig. 1 is not intended to be limiting of the terminal of embodiments of the present invention and may include more or less components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1002, which is a kind of computer storage medium, may include a control program of a multi-split air conditioner.
In the terminal shown in fig. 1, the processor 1001 may be configured to call a control program of the multi-split air conditioner stored in the memory 1002, and perform the following operations:
if the indoor unit in the standby state is detected, taking the detected indoor unit as a target indoor unit;
controlling a throttling device of the target indoor unit to open a preset opening degree, and maintaining a first preset time length;
and after the first preset time, controlling the throttling device of the target indoor unit to be closed.
Further, the processor 1001 may call the control program of the multi-split air conditioner stored in the memory 1002, and further perform the following operations:
acquiring condition judgment factors, wherein the condition judgment factors comprise at least one of the closing time of the throttling device, the exhaust temperature of a compressor of the outdoor unit, the condensation saturation temperature in the multi-split air conditioner and the coil temperature of the indoor unit in the running state;
and controlling the throttling device of the target indoor unit to reopen the preset opening degree when the condition judgment factor is detected to meet the preset condition.
Further, the processor 1001 may call the control program of the multi-split air conditioner stored in the memory 1002, and further perform the following operations:
the closing time of the throttling device reaches a second preset time, wherein the second preset time is longer than the first preset time;
the compressor discharge temperature is greater than or equal to a first temperature;
the condensation saturation temperature is greater than or equal to a second temperature;
the coil temperature is greater than or equal to a third temperature.
Further, the processor 1001 may call the control program of the multi-split air conditioner stored in the memory 1002, and further perform the following operations:
and after a third preset time, controlling the throttling device of the target indoor unit to be closed, and returning to the step of executing the obtaining condition judgment factor, wherein the third preset time is shorter than the first preset time.
Further, the processor 1001 may call the control program of the multi-split air conditioner stored in the memory 1002, and further perform the following operations:
acquiring a reference temperature and an inlet temperature of an indoor unit in a running state, wherein the reference temperature is a condensation saturation temperature in the multi-split air conditioner, or the reference temperature is a coil temperature of the indoor unit in the running state;
and determining the preset opening according to the reference temperature and the inlet temperature.
Further, the processor 1001 may call the control program of the multi-split air conditioner stored in the memory 1002, and further perform the following operations:
determining a difference between the reference temperature and the inlet temperature;
determining the opening degree of the throttling device required to be opened to enable the difference value to reach a preset value;
and taking the determined opening degree as the preset opening degree.
Further, the processor 1001 may call the control program of the multi-split air conditioner stored in the memory 1002, and further perform the following operations:
the standby state comprises a temperature-reaching shutdown state and a shutdown state.
Further, the processor 1001 may call the control program of the multi-split air conditioner stored in the memory 1002, and further perform the following operations:
and reducing the fan rotating speed of the target indoor unit in the temperature-reaching shutdown state to a preset rotating speed.
Referring to fig. 2, in an embodiment, a method for controlling a multi-split air conditioner includes:
in step S10, when an indoor unit in a standby state is detected, the detected indoor unit is set as a target indoor unit.
In this embodiment, the terminal in this embodiment may be a multi-split air conditioner, or may be a control terminal or a server for controlling a multi-split air conditioner. The following description will take the example of the embodiment terminal as a multi-split air conditioner.
Alternatively, each of the multi-split air conditioners includes at least two indoor units (indoor heat exchangers), that is, at least two indoor units are connected to an outdoor unit (outdoor heat exchanger) of the multi-split air conditioner. Wherein, each indoor set all has throttling arrangement corresponding with it to and each indoor set all has the indoor temperature sensor corresponding with it.
Optionally, the throttling device is an electronic expansion valve.
Alternatively, referring to fig. 7, the one-drive-multiple air conditioner includes a compressor 10, a compressor discharge port 11, a gas-liquid separator 12, a four-way valve 20, an outdoor unit 30, a throttling part assembly 40, a throttling device 41, indoor units 50, and indoor units 51.
Optionally, when the multi-split air conditioner is in heating operation, gaseous refrigerant discharged from the compressor flows through the four-way valve, then flows to the indoor unit heat exchanger for cooling, then flows back to the outdoor unit heat exchanger for evaporation into low-pressure gaseous refrigerant, and finally flows back to the compressor, and refrigerant oil of the compressor flows along with the refrigerant in the circulation process.
Optionally, the standby state is characterized as a mode that does not require heat exchange using the outdoor unit, such as a shutdown state, a warm-up shutdown state (a state in which cooling/heating output is stopped when the indoor temperature in the action space corresponding to the indoor unit reaches a set temperature), and the like; the non-standby state is a mode requiring heat exchange using the outdoor unit, such as a heating state, a cooling state, and the like.
When the multi-split air conditioner runs, the terminal can detect the indoor temperature in the action space of each indoor unit in real time or at regular time through the indoor temperature sensor corresponding to the indoor unit, and when the indoor temperature is detected to meet the temperature reaching condition, the indoor unit is judged to be in the temperature reaching shutdown state.
Optionally, the indoor unit operates in a heating mode, and the temperature reaching condition may be that the indoor temperature in the acting space of the indoor unit is greater than or equal to a set temperature; or, the temperature reaching condition may be that a difference value (obtained by subtracting the set temperature from the indoor temperature) between the indoor temperature in the acting space of the indoor unit and the set temperature is greater than or equal to a preset value, wherein the preset value belongs to a temperature compensation value, and is optionally 2 ℃; or, the temperature reaching condition may be that a difference between the indoor temperature in the action space of the indoor unit and the set temperature is within a preset difference range, wherein the preset difference range may be [ -1 ℃, 1 ℃ ]. It should be understood that, in the indoor unit operating in the cooling mode, the reaching condition may be that the indoor temperature in the active space of the indoor unit is less than or equal to the set temperature.
Optionally, when the outdoor unit of the multi-split air conditioner operates in a state corresponding to heating of the air conditioner, the terminal detects whether there is an indoor unit in a standby state at regular time or in real time. When the indoor units in the standby state are detected to exist, the indoor units are taken as target indoor units; when the terminal does not detect the indoor unit in the standby state, the normal heating output of all the indoor units of the multi-split air conditioner is performed, and the terminal does not process the normal heating output.
Alternatively, the non-standby state may be referred to as an operating state, that is, the indoor unit currently in the operating state does not belong to the target indoor unit.
And step S20, controlling the throttle device of the target indoor unit to open a preset opening degree, and maintaining a first preset time length.
Optionally, when the terminal detects at least one target indoor unit, the terminal controls the throttle device of the target indoor unit to open the preset opening.
Alternatively, the preset opening degree is characterized as a minimum opening degree that the throttle device needs to be opened on the premise of ensuring that the refrigerant and the compressor oil are not accumulated in the target indoor machine. The preset opening degree may be selected to be 60P.
Optionally, after the terminal controls the target indoor unit to open the preset opening, the target indoor unit is controlled to maintain the preset opening for a first preset duration.
Optionally, the first preset time period is represented by a time period required for the compressor to reach a stable state, and a value range of the first preset time period may be 1min to 3min, and may be 2 min.
And step S30, after the first preset time, controlling the throttling device of the target indoor unit to be closed.
Optionally, after the target indoor unit is maintained at the preset opening degree for the first preset time, if it is determined that the current compressor is in the stable state, the throttling device of the target indoor unit is controlled to be closed, so as to reduce noise in the acting space of the target indoor unit.
Alternatively, the throttle may be controlled to be fully closed when the throttle is controlled to be closed. For example, when the maximum opening degree of the throttle device is 400P (steps), the throttle device is controlled to perform reverse operation 500P, and thus the throttle device can be completely closed.
Therefore, the supercooling degree (namely the saturated condensation temperature corresponding to the condensation pressure detected by the heating mode system-the outlet temperature of the indoor heat exchanger of the starting-up indoor unit) of the indoor unit can be kept within a reasonable preset value range, the refrigerant circulation quantity of the starting-up indoor unit can meet the heating effect, the standby opening degree (namely the refrigerant circulation quantity of the starting-up indoor unit can be met when the electronic expansion valve of the starting-up indoor unit is in the standby opening degree) of the indoor unit in the standby state (namely the electronic expansion valve of the starting-up indoor unit can be met when the electronic expansion valve of the starting-up indoor unit is in the standby opening degree) is determined by taking the condition as a reference, the electronic expansion valve of the starting-up indoor unit of the temperature shutdown is controlled to be closed, and the refrigerant sound can be eliminated because no refrigerant flows in the indoor unit of the starting-up or temperature shutdown.
In one embodiment, when an indoor unit in a standby state is detected, the detected indoor unit is taken as a target indoor unit; controlling a throttling device of a target indoor unit to open a preset opening degree and maintaining a first preset time length; and after the first preset time, controlling the throttling device of the target indoor unit to be closed. Therefore, the problem of how to reduce the noise of the multi-split air conditioner under the condition of ensuring the stable operation of the multi-split air conditioner is solved.
In a second embodiment, as shown in fig. 3, in addition to the embodiment shown in fig. 2, after the step of controlling the throttle device of the target indoor unit to close after the first time period, the method further includes:
step S40, obtaining condition judgment factors, wherein the condition judgment factors comprise at least one of the closing time of the throttling device, the exhaust temperature of the compressor of the outdoor unit, the condensation saturation temperature in the multi-split air conditioner and the coil temperature of the indoor unit in the running state;
and step S50, controlling the throttling device of the target indoor unit to reopen the preset opening degree when the condition judgment factor is detected to meet the preset condition.
In this embodiment, after the throttling device of the target indoor unit is closed, to avoid the refrigerant accumulation phenomenon occurring in the target indoor unit, the terminal may obtain the condition determining factor, and determine whether the refrigerant accumulation phenomenon may occur in the target indoor unit by detecting the condition determining factor.
Optionally, the condition determining factor includes at least one of a time period during which the throttle device is closed, a compressor discharge temperature of the outdoor unit, a condensation saturation temperature in the one-drive-many air conditioner, and a coil temperature of the indoor unit in an operating state.
The condensation saturation temperature can be determined by the overall high pressure value of the multi-split air conditioner, because the saturation temperature (saturation temperature) is the temperature ts of the liquid and the vapor in a dynamic equilibrium state, i.e. a saturated state. In the saturated state, the temperatures of the liquid and vapor are equal. When the saturation temperature is constant, the saturation pressure is also constant; conversely, the saturation temperature is constant when the saturation pressure is constant. The pressure increases and a new dynamic equilibrium state is formed at the new temperature. A certain saturation temperature of the substance must correspond to a certain saturation pressure. Therefore, the condensation saturation temperature can be obtained by determining the pressure when the refrigerant is saturated.
The coil temperature of the indoor unit in the running state can be acquired by selecting any indoor unit except the target indoor unit. The coil temperature of the indoor unit can be selected as the coil temperature of the middle part of the heat exchanger of the indoor unit and can be acquired by a middle temperature sensor of the heat exchanger of the indoor unit.
Optionally, the preset condition comprises at least one of: the closing time of the throttling device reaches a second preset time, wherein the second preset time is longer than the first preset time; the compressor discharge temperature is greater than or equal to a first temperature; the condensation saturation temperature is greater than or equal to a second temperature; the coil temperature is greater than or equal to a third temperature.
Optionally, after the throttling device is closed, the terminal may start timing, and when it is detected that the closing time of the throttling device reaches a second preset time, it is determined that the condition judgment factor meets the preset condition. Wherein, the value range of the second preset time period can be selected to be 5min-15min, and can be selected to be 10 min.
Alternatively, the terminal may detect the discharge temperature of the compressor at the outdoor unit side in real time or at regular time, and determine that the condition determining factor satisfies the preset condition when the discharge temperature is detected to be greater than or equal to the first temperature. Wherein the first temperature is optionally 85 ℃.
Optionally, the terminal may determine the condensation saturation temperature in the multi-split air conditioner in real time or at regular time, and when it is detected that the condensation saturation temperature is greater than or equal to the second temperature, it is determined that the condition judgment factor satisfies the preset condition. Wherein the second temperature is optionally 52 ℃.
Optionally, the terminal may detect the coil temperature of the indoor unit in the running state in real time or at regular time, and when the coil temperature is detected to be greater than or equal to the third temperature, it is determined that the condition determining factor meets the preset condition. Wherein the third temperature is optionally 52 ℃.
Optionally, after the throttling device of the target indoor unit is closed, when the terminal detects that the condition judgment factor meets the preset condition, the throttling device of the target indoor unit is controlled to be opened again at the preset opening degree.
Optionally, when the condition determining factor includes at least two, the terminal may be configured to, when it is detected that at least one condition determining factor satisfies the preset condition corresponding to the condition determining factor, directly determine that the condition determining factor satisfies the preset condition, so as to control the throttling device of the target indoor unit to reopen the preset opening. Of course, the terminal may also control the throttle device of the target indoor unit to reopen the preset opening degree when detecting that all the condition determination factors satisfy the preset conditions.
In this way, during the closing period of the electronic expansion valve, the indoor unit which is not opened or is stopped at the temperature does not have refrigerant flowing, so that the refrigerant sound can be eliminated. After the electronic expansion valve of the indoor unit in the standby state is closed, when the condition judgment factor is detected to meet the preset condition, the pressure of the condenser of the system is increased, so that the exhaust temperature is increased, and the reliability of the system is damaged.
In an embodiment, when the condition judgment factor is detected to meet the preset condition, the throttle device of the target indoor unit is controlled to reopen the preset opening. Therefore, the refrigerant of the multi-split air conditioner is prevented from being accumulated in the target indoor unit, and the normal operation of the multi-split air conditioner can be ensured.
In a third embodiment, as shown in fig. 4, in addition to the above-mentioned embodiments of fig. 2 to 3, after the step of controlling the throttling device of the target indoor unit to reopen the preset opening degree when the condition determining factor is detected to satisfy the preset condition, the method further includes:
and step S60, after the time length for reopening the throttling gear reaches a third preset time length, controlling the throttling gear of the target indoor unit to close, and returning to the step for executing the obtaining condition judgment factor, wherein the third preset time length is less than the first preset time length.
In this embodiment, when the throttle state of the target indoor unit is reopened, the terminal starts to record the reopening duration of the throttle device.
Optionally, after the terminal detects that the time length for reopening the throttling device reaches a third preset time length, it may be determined that the target indoor unit does not have the phenomenon of refrigerant accumulation at present, and the terminal may control the throttling device of the target indoor unit to be reopened.
And setting the third preset time length to be less than the first preset time length, wherein the value range of the third preset time length can be selected to be 5 seconds-30 seconds, and can be selected to be 10 seconds. Therefore, the time length of the reopening of the throttling device is shortened, the time length of the noise generated when the throttling device is opened can be reduced as much as possible, and the purpose of reducing the noise is achieved.
Alternatively, after the throttle state of the control target indoor unit is closed again, the terminal may return to the step of acquiring the condition judgment factor (i.e., step S40), and when it is detected that the condition judgment factor satisfies the preset condition again, control the throttle device to be opened again, and thus, the operation is cycled.
Taking the condition judgment factor as the closing time of the throttling device as an example, the overall implementation effect of the scheme is that after the throttling device is controlled to be closed for the second preset time, the throttling device is controlled to be opened for the third preset time, and then the throttling device is controlled to be closed for the second preset time, and the operation is repeated in such a way, and because the second preset time is far longer than the third preset time, the throttling device is only opened in a gap manner but is in a closed state for a long time, so that the noise (the time for sending the noise is short) emitted by the target indoor unit can be integrally reduced, and the normal heating capacity of the one-drive-multiple air conditioner can be ensured not to be influenced.
For example, the supercooling degree (namely, the saturated condensation temperature corresponding to the condensation pressure detected by the heating mode system-the outlet temperature of the indoor heat exchanger of the on-machine indoor unit) of the on-machine indoor unit is controlled to be kept in a preset value range, so that the refrigerant circulation quantity of the on-machine indoor unit can meet the heating effect, the standby opening degree (namely, the refrigerant circulation quantity of the on-machine indoor unit can be met when the electronic expansion valve of the on-machine indoor unit which is not opened or is in the standby opening degree) of the indoor unit (the on-machine indoor unit which is not opened or is in the standby opening degree) in the standby state is determined based on the condition, after the electronic expansion valve of the on-machine indoor unit which is in the off state is controlled to be closed for a second preset time period T2, refrigerant sound can be eliminated because no refrigerant flows in the on-machine indoor unit which is not opened or is in the on-machine indoor unit which is in the on-machine outdoor unit which is in the off state, and the second preset time period T2 can be set according to the exhaust temperature TP of the outdoor unit or the condensation temperature TP detected by the system Determining saturated condensing temperature TC corresponding to the pressure, when TP is greater than or equal to 85 ℃ or TC is greater than or equal to 52 ℃, judging that T2 time for closing the electronic expansion valve is cut, and after the indoor unit electronic expansion valve which is not opened or is stopped at a temperature is closed, the pressure of a condenser of the system is increased, so that the exhaust temperature is increased, and the reliability of the system is damaged, therefore, the time for closing the electronic expansion valve needs to be controlled to ensure that the exhaust temperature or the condensing pressure of the system is in a safe range (for example, the time when the TP is 85 ℃ or TC is 52 ℃ is 10 minutes, the T2 time is 10 minutes, if the TP is 85 ℃ or TC is 52 ℃ after the valve is closed for 15 minutes, the T2 time is 15 minutes), when the system detects that the TP is greater than or equal to 85 ℃ or TC is greater than 52 ℃ after the electronic expansion valve is closed for T2 time, the indoor unit electronic expansion valve which is not opened or stopped at a temperature is opened again to a standby opening for a third preset time T3, when TP <85 ℃ or TC <52 ℃, the electronic expansion valve is closed to 0 from the standby opening degree for a second preset time period T2, and the circulation process is repeated.
Therefore, the problem of how to reduce the noise of the multi-split air conditioner under the condition of ensuring the stable operation of the multi-split air conditioner is solved.
In a fourth embodiment, as shown in fig. 5, in addition to the above embodiments of fig. 2 to 4, before the step of controlling the throttling device of the target indoor unit to be opened by a preset opening degree and to be maintained for a first preset time period, the method further includes:
step S70, acquiring a reference temperature and an inlet temperature of the indoor unit in the running state, wherein the reference temperature is a condensation saturation temperature in the multi-split air conditioner, or the reference temperature is a coil temperature of the indoor unit in the running state;
and step S71, determining the preset opening according to the reference temperature and the inlet temperature.
In this embodiment, the reference temperature may be a condensation saturation temperature in the multi-split air conditioner, or the reference temperature may be a coil temperature of the indoor unit in an operating state.
Optionally, before the throttling device of the control target indoor unit is opened at the preset opening, the terminal may obtain the reference temperature and the inlet temperature of the indoor unit in the running state at regular time or in real time, and then determine the preset opening according to the reference temperature and the inlet temperature of the indoor unit.
Further, the terminal determines a difference between the reference temperature and the inlet temperature, and then detects whether the difference reaches a preset value. If the difference value is detected to be smaller than the preset value, the opening degree of the throttling device of the indoor unit corresponding to the inlet temperature is adjusted, so that the numerical values of the reference temperature and the inlet temperature are changed, a new difference value is obtained, and the adjustment and control are carried out until the difference value of the reference temperature and the inlet temperature reaches the preset value. Wherein the preset value can be selected to be 12 ℃.
Further, when the terminal detects that the difference between the reference temperature and the inlet temperature reaches a preset value, the terminal records the opening degree of the throttling device of the indoor unit corresponding to the inlet temperature as a preset opening degree.
For example, when TC is used as a reference temperature, TA is used as an inlet temperature of the indoor unit in an operating state, and C is used as a preset value, an opening degree required for opening the throttle device when TC-T2A is made equal to C is determined, and the determined opening degree is used as the preset opening degree.
Alternatively, if the opening degree of the throttling device of the corresponding indoor unit is regulated and controlled in the process of determining the preset opening degree value, the opening degree of the throttling device of the corresponding indoor unit can be restored to the opening degree before regulation and control when the preset opening degree is determined.
Therefore, the optimal preset opening degree can be obtained by making the preset opening degree for the throttling device of the target indoor unit according to the supercooling degree of the indoor unit in the running state, so that the situation that the indoor unit in normal running lacks a refrigerant (the refrigerant is prevented from being accumulated in the target indoor unit) to influence the heating effect is avoided, and the noise generated by the target indoor unit can be reduced as much as possible.
In a fifth embodiment, as shown in fig. 6, based on the above embodiments of fig. 2 to 5, the standby state includes a warm-up shutdown state and a shutdown state, and after the step of taking the detected indoor unit as the target indoor unit when the indoor unit in the standby state is detected, the method further includes:
and step S80, reducing the fan rotating speed of the target indoor unit in the temperature-reaching shutdown state to a preset rotating speed.
In this embodiment, the terminal determines that the indoor unit in the warm shutdown state or the indoor unit in the shutdown state is the indoor unit in the standby state.
Optionally, when the terminal detects that a target indoor unit in the temperature-reached shutdown state exists in the target indoor units, the rotation speed of the fan of the target indoor unit is reduced to a preset rotation speed.
It should be noted that, when the throttling device of the target indoor unit is controlled to be repeatedly opened and closed, the heat radiation generated during the opening process of the throttling device of the target indoor unit may cause detection distortion of the indoor temperature sensor (the temperature detected by the indoor temperature sensor is higher than the actual indoor temperature), and therefore, when the target indoor unit is in the temperature-reached shutdown state, the fan of the indoor unit is not controlled to be directly turned off, but the rotation speed of the fan is reduced to the preset rotation speed.
It should be noted that the preset rotation speed is characterized by the minimum rotation speed required by the fan to operate on the premise of avoiding detection distortion of the indoor temperature sensor, and the value range of the preset rotation speed may be 30 rpm to 60 rpm. Like this, the fan through the target indoor set is with predetermineeing the rotational speed operation, can avoid the indoor temperature sensor detection distortion that corresponds through the heat dissipation of blowing, can reduce the consumption of air conditioner again.
In addition, the invention also provides a multi-split air conditioner, which comprises an outdoor unit and at least two indoor units, wherein the multi-split air conditioner comprises a memory, a processor and a control program of the multi-split air conditioner, the control program of the multi-split air conditioner is stored in the memory and can be operated on the processor, and the steps of the control method of the multi-split air conditioner are realized when the processor executes the control program of the multi-split air conditioner.
Furthermore, the present invention also provides a computer-readable storage medium, which includes a control program of a multi-split air conditioner, and when the control program of the multi-split air conditioner is executed by a processor, the steps of the control method of the multi-split air conditioner as described in the above embodiments are implemented.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is an alternative embodiment. 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 (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a television, a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A control method for a multi-split air conditioner is characterized in that the multi-split air conditioner comprises an outdoor unit and at least two indoor units, and the control method for the multi-split air conditioner comprises the following steps:
if the indoor unit in the standby state is detected, taking the detected indoor unit as a target indoor unit;
controlling a throttling device of the target indoor unit to open a preset opening degree, and maintaining a first preset time length;
and after the first preset time, controlling the throttling device of the target indoor unit to be closed.
2. The method for controlling a multi-split air conditioner according to claim 1, wherein after the step of controlling the throttle device of the target indoor unit to be closed after the first period, further comprising:
acquiring condition judgment factors, wherein the condition judgment factors comprise at least one of the closing time of the throttling device, the exhaust temperature of a compressor of the outdoor unit, the condensation saturation temperature in the multi-split air conditioner and the coil temperature of the indoor unit in the running state;
and controlling the throttling device of the target indoor unit to reopen the preset opening degree when the condition judgment factor is detected to meet the preset condition.
3. A control method of a multi-split air conditioner as set forth in claim 2, wherein said preset conditions include at least one of:
the closing time of the throttling device reaches a second preset time, wherein the second preset time is longer than the first preset time;
the compressor discharge temperature is greater than or equal to a first temperature;
the condensation saturation temperature is greater than or equal to a second temperature;
the coil temperature is greater than or equal to a third temperature.
4. The method for controlling a multi-split air conditioner as claimed in claim 2 or 3, wherein after the step of controlling the throttle device of the target indoor unit to reopen the preset opening degree when the condition determining factor is detected to satisfy the preset condition, the method further comprises:
and after the time length for reopening the throttling device reaches a third preset time length, controlling the throttling device of the target indoor unit to be closed, and returning to the step of executing the obtaining condition judgment factors, wherein the third preset time length is less than the first preset time length.
5. The method for controlling a multi-split air conditioner as claimed in claim 1 or 2, wherein before the step of controlling the throttle device of the target indoor unit to be opened by a preset opening degree and to be maintained for a first preset time period, the method further comprises:
acquiring a reference temperature and an inlet temperature of an indoor unit in a running state, wherein the reference temperature is a condensation saturation temperature in the multi-split air conditioner, or the reference temperature is a coil temperature of the indoor unit in the running state;
and determining the preset opening according to the reference temperature and the inlet temperature.
6. A control method of a multi-split air conditioner as set forth in claim 5, wherein the step of determining the preset opening degree based on the reference temperature and the inlet temperature comprises:
determining a difference between the reference temperature and the inlet temperature;
determining the opening degree of the throttling device required to be opened to enable the difference value to reach a preset value;
and taking the determined opening degree as the preset opening degree.
7. A control method of a multi-split air conditioner as set forth in claim 1, wherein said standby state includes a temperature-reaching shutdown state and a power-off state.
8. The method for controlling a multi-split air conditioner according to claim 7, wherein the step of detecting the indoor unit in a standby state and setting the detected indoor unit as a target indoor unit further comprises:
and reducing the fan rotating speed of the target indoor unit in the temperature-reaching shutdown state to a preset rotating speed.
9. A multi-split air conditioner comprising an outdoor unit and at least two indoor units, wherein the multi-split air conditioner comprises a memory, a processor and a control program of the multi-split air conditioner stored in the memory and operable on the processor, and the control program of the multi-split air conditioner realizes the steps of the control method of the multi-split air conditioner as claimed in any one of claims 1 to 8 when executed by the processor.
10. A computer-readable storage medium, wherein the computer-readable storage medium has stored thereon a control program for a multi-split air conditioner, which when executed by a processor, implements the steps of the method for controlling a multi-split air conditioner according to any one of claims 1 to 8.
CN202010276689.6A 2020-04-08 2020-04-08 Control method of multi-split air conditioner, multi-split air conditioner and storage medium Pending CN113494764A (en)

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