CN115235099A - Multi-online defrosting control method and multi-online system - Google Patents

Multi-online defrosting control method and multi-online system Download PDF

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Publication number
CN115235099A
CN115235099A CN202210949672.1A CN202210949672A CN115235099A CN 115235099 A CN115235099 A CN 115235099A CN 202210949672 A CN202210949672 A CN 202210949672A CN 115235099 A CN115235099 A CN 115235099A
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China
Prior art keywords
indoor unit
indoor
shutdown
defrosting
temperature
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CN202210949672.1A
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Chinese (zh)
Inventor
邓赛峰
李理科
刘合心
陈华
张国帅
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Priority to CN202210949672.1A priority Critical patent/CN115235099A/en
Publication of CN115235099A publication Critical patent/CN115235099A/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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41—Defrosting; Preventing freezing
    • 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
    • F24F11/62—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
    • F24F11/67—Switching between heating and cooling modes
    • 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 provides a multi-online defrosting control method and a multi-online system, wherein the multi-online system comprises at least two indoor units, an independent indoor reversing device is additionally arranged on a pipeline of each indoor unit, and the control method comprises the following steps: when part of the indoor units are started, controlling the indoor reversing device of the shutdown indoor unit to switch so as to disconnect the shutdown indoor unit from the main pipeline, and simultaneously controlling the startup indoor unit to be normally communicated with the main pipeline; when the outdoor unit has a defrosting requirement, controlling the switching of an indoor reversing device of the shutdown indoor unit to enable the shutdown indoor unit to be communicated with the main pipeline, simultaneously opening a throttle valve of the shutdown indoor unit, and controlling the time for entering a defrosting mode according to the pipe temperature of the shutdown indoor unit; meanwhile, the indoor reversing device of the starting indoor unit is switched, and the throttle valve of the starting indoor unit is closed, so that the starting indoor unit is disconnected from the main pipeline. The flow direction of the refrigerant of the indoor unit in different modes can be controlled, the distribution of the refrigerant in different indoor units is adjusted, uninterrupted heating during defrosting is realized, and the use comfort is improved.

Description

Multi-online defrosting control method and multi-online system
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioner defrosting control method and a multi-split system.
Background
In a low-temperature and high-humidity environment, the outdoor heat exchanger is easy to frost after heating operation is carried out for a period of time, the heating capacity of the indoor unit is gradually reduced at the moment, the defrosting mode needs to be switched, and heating operation is continued after a frost layer on the surface of the outdoor heat exchanger melts.
The defrosting mode is usually switched to a cooling operation, the temperature of the indoor unit pipe is reduced (can be reduced to below-20 ℃), and in order to prevent the indoor unit from blowing cold air, the fan of the indoor unit stops operating. After defrosting is finished, heating operation is started again, and after the temperature of the indoor unit pipe rises to a certain threshold value (generally above 20 ℃), the indoor unit fan is started again to operate, so that the heating capacity of the indoor unit is interrupted during defrosting, and the use comfort is seriously affected. In addition, during defrosting, along with the temperature reduction of the heat exchanger of the indoor unit, even fin freezing sound can be generated, and meanwhile, the temperature of the heat exchanger is increased after being reduced, so that the heating waiting time is long, and unnecessary energy consumption can be caused.
Disclosure of Invention
In view of the above, the present invention is directed to a multi-split on-line defrosting control method and a multi-split on-line system, so as to solve the problems of the prior art, such as interruption of heating capability of an indoor unit during defrosting, easy generation of freezing sound of fins, and high energy consumption.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a multi-split defrosting control method comprises at least two indoor units, wherein an independent indoor reversing device is additionally arranged on a pipeline of each indoor unit, and the control method comprises the following steps:
when part of the indoor units are started, controlling the indoor reversing device of the shutdown indoor unit to switch so as to disconnect the shutdown indoor unit from the main pipeline, and simultaneously controlling the startup indoor unit to be normally communicated with the main pipeline;
when the outdoor unit has a defrosting requirement, controlling the switching of an indoor reversing device of the shutdown indoor unit to enable the shutdown indoor unit to be communicated with the main pipeline, simultaneously opening a throttle valve of the shutdown indoor unit, and controlling the time for entering a defrosting mode according to the pipe temperature of the shutdown indoor unit; meanwhile, the indoor reversing device of the starting indoor unit is switched, and the throttle valve of the starting indoor unit is closed, so that the starting indoor unit is disconnected from the main pipeline. Through the setting of indoor switching-over device, can control the flow direction of indoor set refrigerant under the different mode, adjust the distribution of refrigerant in different indoor sets, can not only promote the effect of heating, avoid the fin to freeze the noise, can prevent frequent reduction of indoor set pipe temperature when changing frost, rise moreover, reduce unnecessary air conditioner energy consumption.
Furthermore, when the starting indoor unit is disconnected from the main pipeline and the fan of the starting indoor unit continues to operate, the fan of the starting indoor unit is operated according to the return air temperature T 26 And adjusting the rotating speed. During defrosting, a fan of the indoor unit is automatically adjusted according to the room temperature, the heating comfort is ensured, and the condition that the indoor unit has lower return air temperature but higher rotating speed to influence the comfort of indoor users is avoided.
Furthermore, after the startup indoor unit is disconnected from the main pipeline, the return air temperature T of the startup indoor unit 26 Exceeds a first temperature threshold T 1 When the air conditioner is started, the fan of the indoor unit is started to maintain the windshield set by a user to operate; return air temperature T of indoor unit during starting up 26 Not exceeding a first temperature threshold T 1 And when the air conditioner is started, the fan of the indoor unit is controlled to be lowered to the low windshield for operation. Thereby achieving the purpose of uninterrupted heating.
Further, the first temperature threshold T 1 The temperature is set to be 20-30 ℃.
Further, the timing of controlling the defrosting mode according to the pipe temperature of the shutdown indoor unit comprises: pipe temperature T of indoor unit in shutdown 23 Reaching a second temperature threshold T 2 Or the duration t after the switching action of the indoor reversing device of the shutdown indoor unit exceeds the second preset time t 2 And when the refrigerant flows into the defrosting mode, the four-way reversing valve of the outdoor unit is operated in a reversing mode, so that the refrigerant flows in a switching mode.
Further, the second temperature threshold T 2 Set to 20-30 ℃ for a second preset time t 2 Setting for 1-5 min.
And further, after defrosting is finished, the defrosting mode is exited, and the running state of the indoor unit is controlled according to the temperature of the pipe of the indoor unit and/or the duration time after exiting the defrosting mode.
Further, the pipe temperature T of the indoor unit is shut down 23 Not exceeding a third temperature threshold T 3 When the indoor unit is started, the current state operation of the shutdown indoor unit is maintained, meanwhile, the reversing device of the startup indoor unit acts, the main pipeline is connected with the pipeline of the startup indoor unit again, the throttle valve of the startup indoor unit is opened, and the startup indoor unit continues to perform heating operation; and a part of high-temperature refrigerant enters the shutdown indoor unit to prevent freezing caused by too low temperature of a heat exchanger of the shutdown indoor unit, and meanwhile, high-temperature gaseous refrigerant enters the startup indoor unit to continue heating operation.
Pipe temperature T of indoor unit in shutdown 23 Exceeds a third temperature threshold T 3 When the time or after defrosting is quitted reaches a third time threshold t 3 And when the air conditioner is in the off state, the throttle valve of the off indoor unit is closed, the reversing device of the off indoor unit acts, and the off indoor unit pipeline is disconnected with the main pipeline.
Further, the pipe temperature T of the indoor unit is started 23 Exceeds a fourth temperature threshold T 4 When the time or after defrosting is quitted reaches a fourth time threshold t 4 When the indoor unit is started, the fan of the indoor unit is recovered to enterAnd (4) entering a state before defrosting, otherwise, starting the indoor unit and maintaining the operation at a low wind level. Pipe temperature T of starting indoor unit 23 Exceeds a fourth temperature threshold T 4 The temperature of the heat exchanger of the starting indoor unit is higher, and the comfort level of an indoor user cannot be influenced by increasing the windshield. When the duration reaches a fourth time threshold t after defrosting is exited 4 And the defrosting time is long, and the comfort of indoor users cannot be influenced by increasing the windshield.
Compared with the prior art, the multi-online defrosting control method has the following advantages:
through the arrangement of the independent indoor reversing device, the flow directions of refrigerants of different indoor units in different modes can be controlled, the distribution of the refrigerants in different indoor units is adjusted, the heating effect can be improved, the fin freezing noise is avoided, frequent reduction and rise of the indoor unit pipe temperature during defrosting can be prevented, and unnecessary air conditioner energy consumption is reduced.
The invention also provides a multi-online system which can execute the multi-online defrosting control method.
Compared with the prior art, the multi-online system and the multi-online defrosting control method have the same advantages, and are not described again.
Drawings
Fig. 1 is a schematic diagram illustrating heating operation of a multi-split air conditioning system according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating operation of a shutdown indoor unit of a multi-split system according to an embodiment of the invention;
fig. 3 is a defrosting operation schematic diagram of a multi-split system according to an embodiment of the invention;
fig. 4 is a schematic operation diagram of the multi-split system after defrosting exits;
fig. 5 is a schematic flow chart of a multi-online defrosting control method according to an embodiment of the invention.
Description of the reference numerals:
11-compressor, 12-main pipeline, 13-outdoor unit four-way reversing valve, 14-outdoor heat exchanger; 21-throttle valve, 22-indoor reversing device, 23-first pipeline temperature sensor, 24-indoor unit, 25-fan system, 26-return air temperature sensor and 27-second pipeline temperature sensor
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.
As shown in fig. 1 to 5, the present embodiment provides a multi-split defrosting control method, where the multi-split air conditioner includes at least two indoor units, and an independent indoor reversing device is additionally disposed on a pipeline of each indoor unit to control a flow direction of a refrigerant in different modes, where the control method includes the following steps:
and S100, acquiring the running states of all indoor units, and running according to a common heating mode and a defrosting mode when all the indoor units are started. When the defrosting mode needs to be executed at the moment, all the indoor units are switched to the refrigerating operation, and in order to prevent the indoor units from blowing out cold air, the fans of the indoor units stop operating.
S201, when a part of indoor units are started, controlling an indoor reversing device of a shutdown indoor unit to switch to disconnect the shutdown indoor unit from a main pipeline, so that high-temperature gaseous refrigerants cannot enter the shutdown indoor unit; and meanwhile, the startup indoor unit is controlled to be normally communicated with the main pipeline.
Specifically, as shown in fig. 1, when some indoor units are turned on and the remaining indoor units are turned off, the throttle valve 21 of the turned-off indoor unit is closed, and the indoor reversing device of the turned-off indoor unit switches the flow direction of the refrigerant, so that the high-temperature gaseous refrigerant does not enter the turned-off indoor unit; the throttle valve of the starting indoor unit is normally opened, the indoor reversing device of the starting indoor unit does not need to be switched, and it is ensured that the high-temperature gaseous refrigerant normally enters the starting indoor unit.
And S202, when part of the indoor units are started and the outdoor unit has a defrosting requirement, controlling the indoor reversing device of the shutdown indoor unit in the S2 to switch, so that the shutdown indoor unit is communicated with the main pipeline, and simultaneously, opening a throttle valve of the shutdown indoor unit.
Specifically, as shown in fig. 2, in a state where a part of the indoor units are turned on, after frosting of the heat exchanger of the indoor unit is detected, it is determined that the air conditioner needs to perform a defrosting operation at this time, after a defrosting instruction is received, before entering a defrosting mode, an indoor reversing device of the shutdown indoor unit is controlled to switch over so as to communicate a main pipeline of the shutdown indoor unit, and meanwhile, an opening degree of a throttle valve of the shutdown indoor unit is A1, so that a high-temperature gas enters the shutdown indoor unit, and the temperature of the heat exchanger of the shutdown indoor unit is raised.
Further, the opening degree A1 of the throttle valve is small, preferably, the opening degree A1 is set to 20 to 50 steps, so that a small amount of high-temperature gaseous refrigerant enters the shutdown indoor unit slowly, and the temperature of the heat exchanger of the shutdown indoor unit is appropriately raised.
And S203, when part of the indoor units are started and the outdoor unit defrosting requirement exists, switching the indoor reversing devices of the rest started indoor units, and closing the throttle valves of the started indoor units to disconnect the started indoor units from the main pipeline.
Furthermore, after the indoor reversing devices of the rest of the startup indoor units are switched, the startup indoor units are disconnected from the main pipeline, the fans of the startup indoor units continue to operate, and the waste heat of the heat exchangers of the startup indoor units is utilized for heat dissipation, so that the phenomenon that the comfort level of indoor users is affected when low-temperature liquid refrigerants enter the startup indoor units during subsequent defrosting is avoided, meanwhile, the startup indoor units are not stopped, and uninterrupted heating is realized.
S204, when the starting indoor unit is disconnected from the main pipeline and the fan of the starting indoor unit continues to operate, the fan of the starting indoor unit operates according to the return air temperature T 26 And adjusting the rotating speed.
Specifically, when the return air temperature T of the indoor unit is started 26 Exceeds a first temperature threshold T 1 And when the temperature of the indoor unit is higher, the fan of the indoor unit is kept in the windshield operation set by the user, and the comfort level of the indoor user is not influenced. When the return air temperature T of the indoor unit is started 26 Not exceeding a first temperature threshold T 1 Then, the indoor temperature of the starting indoor unit is judged to be lower, and the starting indoor unit is controlledThe fan of the machine is lowered to the low wind shield to operate, and if the wind shield is the low wind shield, the gear is maintained to operate, so that the purpose of heating without interruption is achieved.
Further, the return air temperature T 26 The temperature is obtained by a temperature sensor arranged at the air return side of the heat exchanger of the corresponding indoor unit. First temperature threshold T 1 The temperature is set to be 20-30 ℃.
And S205, after the defrosting instruction is received and before the indoor reversing device of the shutdown indoor unit enters the defrosting mode, controlling the time for entering the defrosting mode according to the pipe temperature of the shutdown indoor unit after the indoor reversing device of the shutdown indoor unit is switched. Unnecessary energy consumption caused by the temperature reduction and rise of the indoor unit pipe during defrosting is reduced.
Specifically, as shown in fig. 3, when the pipe temperature T of the indoor unit is turned off 23 Reaching a second temperature threshold T 2 Or the duration t after the switching action of the indoor reversing device of the shutdown indoor unit exceeds the second preset time t 2 And when the defrosting mode is started, the four-way reversing valve of the outdoor unit is controlled to perform reversing operation, so that the refrigerant is switched to flow direction, namely, the defrosting mode is started. After entering the defrosting mode, the high-temperature gaseous refrigerant enters the outdoor heat exchanger to be defrosted, the cooled refrigerant enters the shutdown indoor unit along the main pipeline, the shutdown indoor unit maintains a shutdown state, the refrigerant is gasified by using the waste heat obtained by the shutdown indoor unit heat exchanger in the step S202, and then flows back to the compressor through the main pipeline.
Further, the pipe temperature T of the indoor unit is shut down 23 The temperature of the first pipeline is obtained by a first pipeline temperature sensor arranged on a refrigerant discharge pipeline of the corresponding indoor unit heat exchanger. Second temperature threshold T 2 Setting the temperature to be between 20 and 30 ℃, and setting the second preset time t 2 The setting is 1-5 min.
And S206, after defrosting is finished, exiting the defrosting mode, and controlling the running state of the indoor unit according to the pipe temperature of the indoor unit and/or the duration time after exiting the defrosting mode. The indoor units comprise a startup indoor unit and a shutdown indoor unit. Specifically, when it is detected that a frost layer of the outdoor heat exchanger is melted, the four-way reversing valve of the outdoor unit acts, that is, the outdoor unit exits from the defrosting mode.
As shown in fig. 4, when the indoor unit is turned off, the pipe temperature T 23 Does not exceed a third temperature threshold T 3 When the temperature of the heat exchanger of the shutdown indoor unit is too low, the current state of the shutdown indoor unit is maintained to operate, and a part of high-temperature refrigerant enters the shutdown indoor unit to avoid freezing caused by too low temperature of the heat exchanger of the shutdown indoor unit; and simultaneously, the reversing device of the starting indoor unit acts, the main pipeline is restored to be connected with the pipeline of the starting indoor unit, and the throttle valve of the starting indoor unit is opened, so that the high-temperature gaseous refrigerant enters the starting indoor unit and continues to perform heating operation.
When the pipe temperature T of the indoor unit of the shutdown 23 Exceeds a third temperature threshold T 3 When the time or after defrosting is quitted reaches a third time threshold t 3 When the indoor unit is in the heating state, the throttle valve of the shutdown indoor unit is closed, and the reversing device of the shutdown indoor unit acts to disconnect the pipeline of the shutdown indoor unit from the main pipeline and restore the heating state to S201 (shown in fig. 1).
Furthermore, when the temperature of the pipe of the shutdown indoor unit is higher, the temperature of the heat exchanger of the shutdown indoor unit is moderate or higher, and the freezing of the refrigerant in the shutdown indoor unit cannot be caused; when the temperature of the shutdown indoor unit is low, the refrigerant in the shutdown indoor unit is easy to freeze, and part of high-temperature refrigerant needs to be guided into the shutdown indoor unit to improve the temperature of a heat exchanger of the shutdown indoor unit, so that the freezing abnormal sound of the shutdown indoor unit during defrosting is avoided.
When the pipe temperature T of the indoor unit is started 23 Exceeds a fourth temperature threshold T 4 When the time or after defrosting is quitted reaches a fourth time threshold t 4 And when the defrosting air conditioner is started, the fan of the indoor unit is started to recover to the state before defrosting, otherwise, the low-wind-level operation is maintained. Pipe temperature T of starting indoor unit 23 Exceeds a fourth temperature threshold T 4 The temperature of the heat exchanger of the starting indoor unit is higher, and the comfort level of an indoor user cannot be influenced by increasing the windshield. When the duration reaches a fourth time threshold t after defrosting is exited 4 And the defrosting time is long, and the comfort of indoor users cannot be influenced by increasing the windshield.
Preferably, the fourth temperature threshold T 4 Greater than a third temperature threshold T 3 Third temperature threshold T 3 Set to 0-10 deg.C, and a third time threshold t 3 Set to 30-100 s, fourth time threshold t 4 Is arranged as20-30 ℃ and a fourth time threshold t 4 Setting for 2-10 min.
According to the multi-split defrosting control method provided by the embodiment, when the multi-split defrosting control method enters a defrosting mode, whether the corresponding indoor reversing device acts or not is selected according to the running state of the indoor unit, and a low-temperature liquid refrigerant is prevented from entering the indoor unit heat exchanger to reduce the pipe temperature. During defrosting, a fan of the starting indoor unit operates normally, and waste heat of a heat exchanger of the starting indoor unit is utilized to heat, so that heating is uninterrupted during defrosting; after defrosting is finished, when the heating operation is restarted, the indoor reversing device is controlled to act again, so that high-temperature refrigerants enter the starting indoor unit, the purposes of shortening heating waiting time and quickly heating are achieved, and the using effect is improved.
As a part of the embodiment of the present invention, there is also provided a method for controlling multiple indoor units when some indoor units are turned on, taking the case that an indoor unit 01 is turned off and the remaining indoor units are turned on, specifically including the following steps:
s1, the indoor unit 01 is disconnected from the main pipeline, a refrigerant flowing to the indoor unit 01 directly returns to the main pipeline through a throttle valve after passing through an indoor reversing device of the indoor unit 01, and the refrigerant does not enter the indoor unit 01.
The indoor unit N is communicated with the main pipeline, and refrigerants flowing to the starting indoor units respectively pass through the indoor reversing devices of the starting indoor units, then enter the heat exchangers in the starting indoor units for heat exchange, and then return to the main pipeline through the throttle valves of the starting indoor units.
S2, detecting whether defrosting of the heat exchanger of the outdoor unit needs to be executed, if yes, executing the step S3, and if not, continuously operating in the state of S1.
And S3, controlling the indoor reversing device of the indoor unit 01 to switch, communicating the main pipeline with the indoor unit 01 pipeline, and controlling the throttle valve of the indoor unit 01 to open a small opening degree.
The method comprises the steps of controlling an indoor unit 02 and an indoor unit 03 \8230, closing a throttle valve of an indoor unit N, switching an indoor reversing device to enable the indoor unit 02 and the indoor unit 03 \8230, disconnecting the indoor unit N from a main pipeline, enabling the indoor unit 02 and the indoor unit 03 \8230, continuing to operate a fan of the indoor unit N, and utilizing waste heat of a heat exchanger to dissipate heat.
S4, detecting the indoor unit 02 and the indoor unit 03 \8230andjudging whether the return air temperature of the indoor unit N exceeds a first temperature threshold value T or not 1 If yes, the indoor temperature of the corresponding indoor unit is considered to be high, and the fan maintains the wind gear set by the user to operate; if not, the indoor temperature is judged to be lower, the indoor fan is controlled to be lowered to the low wind gear for operation, and if the wind gear is already the low wind gear, the gear is maintained for operation, so that the purpose of uninterrupted heating is achieved.
The indoor unit N comprises an indoor unit 02 and an indoor unit 03 \ 8230, wherein in the indoor unit N, only the return air temperature of the indoor unit 02 exceeds a first temperature threshold T 1 The indoor unit 03 \8230hasN return air temperature not higher than the first temperature threshold T 1 When the air conditioner is in use, the indoor temperature of the indoor unit 02 is high, the indoor temperatures of the other indoor units 03 \8230, the indoor temperature of the indoor unit N is low, the fan of the indoor unit 02 maintains the wind gear set by a user to operate, the other indoor units 03 \8230, the fan of the indoor unit N is reduced to the low wind gear to operate, and if the wind gear is already the low wind gear, the wind gear is maintained to operate.
S5, detecting whether the pipe temperature of the indoor unit 01 reaches a second temperature threshold value T 2 Or whether the duration of the reversing of the indoor reversing device of the indoor unit 01 reaches t 2 And if any condition is met, executing the step S6, otherwise, returning to the step S3, and executing the defrosting operation when the indoor unit meets any condition.
And S6, entering a defrosting mode, switching the flow direction of the refrigerant by using an outdoor unit four-way reversing valve, enabling a high-temperature gas state to firstly enter an outdoor heat exchanger for defrosting after the refrigerant passes through the outdoor unit four-way reversing valve, enabling the cooled refrigerant to enter an indoor unit 01 along a pipeline, maintaining the indoor unit 01 in a shutdown state, gasifying the refrigerant by using the waste heat obtained by the indoor unit 01 heat exchanger in the step S3, and then returning the refrigerant to the compressor through the pipeline.
S7, detecting whether a frost layer of the outdoor heat exchanger is melted or not, if not, continuing to execute the step S6, if so, exiting the defrosting mode, and detecting the pipe temperature T of the indoor unit 01 23 And a duration after exiting the defrosting mode, and performing steps S8a and S8b.
S8a, the tube temperature T of the indoor unit 01 23 ≤T 3 While maintainingWhen the air conditioner runs in the current state, a part of high-temperature refrigerant enters the indoor unit 01, freezing caused by the fact that the temperature of a heat exchanger is too low is avoided, meanwhile, the indoor unit 02 and the indoor unit 03 method 8230, an indoor reversing device of the indoor unit N acts, a main pipeline acts on the indoor unit 02 and the indoor unit 03 method 8230, the indoor unit N is connected again, the indoor unit 02 and the indoor unit 03 method 8230are connected, a throttle valve of the indoor unit N is opened, the high-temperature gaseous refrigerant enters the indoor unit 02 and the indoor unit 03 method 8230, and the indoor unit N continues heating running;
s8b, the pipe temperature T of the indoor unit 01 23 ＞T 3 Or the duration after the defrosting mode is exited reaches t 3 When the throttle valve of the indoor unit 01 is closed, the indoor reversing device of the indoor unit 01 operates to disconnect the pipe of the indoor unit 01 from the main pipe, and the heating state shown in S1 is restored.
S9, detecting whether the indoor unit 02 and the indoor unit 03 \ 8230and whether the pipe temperature of the indoor unit N is more than T 4 Or whether the duration time after the defrosting mode is exited reaches t 4 If yes, the indoor machine 02 and the indoor machine 03 \ 8230, and the fan of the indoor machine N is restored to the state before defrosting; if not, the indoor unit 02 and the indoor unit 03 \8230arecarried out, and the indoor unit N keeps running at a low windshield.
As part of the embodiment of the present invention, a multi-split system is further provided, including a compressor 11, a refrigerant main pipeline 12, an outdoor unit four-way reversing valve 13, an outdoor heat exchanger 14, and a plurality of indoor units 24, where the outdoor unit four-way reversing valve 13 is communicated with the compressor 11 and is used to switch the flow direction of the refrigerant according to the operation mode of the air conditioning system, the outdoor heat exchanger 14 may be a single-module or multi-module outdoor heat exchanger 14, in addition, an independent indoor reversing device 22 and a throttle valve 21 are provided on the pipeline of each indoor unit 24, and whether the refrigerant flows through each indoor heat exchanger and the flow rate of the refrigerant flowing through each indoor heat exchanger can be individually controlled according to needs. An independent fan system 25 is also arranged in each indoor unit 24, and the windshield of each indoor unit can be independently controlled according to needs.
Further, the indoor reversing device 22 is also provided with a four-way valve structure which is the same as or similar to the outdoor four-way reversing valve, so that the switching of the flow directions of different refrigerants is convenient to realize.
Furthermore, a second pipeline temperature sensor 27 is arranged on the refrigerant inlet pipeline of each indoor heat exchanger, and a first pipeline temperature sensor 23 is arranged on the refrigerant outlet pipeline of each indoor heat exchanger. A return air temperature sensor 26 is provided on the inlet side of the fan system 25 of each indoor unit 24 to detect the return air temperature of each indoor unit.
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 (10)

1. A multi-connected defrosting control method comprises at least two indoor units, and is characterized in that an independent indoor reversing device is additionally arranged on a pipeline of each indoor unit, and the control method comprises the following steps:
when part of the indoor units are started, controlling the indoor reversing device of the shutdown indoor unit to switch so as to disconnect the shutdown indoor unit from the main pipeline, and simultaneously controlling the startup indoor unit to be normally communicated with the main pipeline;
when the outdoor unit has a defrosting requirement, controlling the switching of an indoor reversing device of the shutdown indoor unit to enable the shutdown indoor unit to be communicated with the main pipeline, simultaneously opening a throttle valve of the shutdown indoor unit, and controlling the time for entering a defrosting mode according to the pipe temperature of the shutdown indoor unit; meanwhile, the indoor reversing device of the starting indoor unit is switched, and the throttle valve of the starting indoor unit is closed, so that the starting indoor unit is disconnected from the main pipeline.
2. The multiple on-line frost control method according to claim 1, wherein when the on-line indoor unit is disconnected from the main pipeline and the fan of the on-line indoor unit continues to operate, the fan of the on-line indoor unit is operated according to the return air temperature T 26 And adjusting the rotating speed.
3. The multi-connected defrosting control method according to claim 1 or 2, characterized in that after the startup indoor unit is disconnected from the main pipeline, the return air temperature T of the startup indoor unit is measured 26 Exceeds a first temperature threshold T 1 When the air conditioner is started, the fan of the indoor unit is started to maintain the windshield set by a user to operate; return air temperature T of indoor unit during starting 26 Not exceeding a first temperature threshold T 1 And when the fan of the starting indoor unit is controlled to be lowered to the low windshield for operation.
4. The multi-connected frost control method according to claim 3, wherein the first temperature threshold T is 1 The temperature is set to be 20-30 ℃.
5. The multi-online defrosting control method according to claim 1, wherein controlling the timing of entering the defrosting mode according to the pipe temperature of the shutdown indoor unit comprises: pipe temperature T of indoor unit in shutdown 23 Reaching a second temperature threshold T 2 Or the duration t after the switching action of the indoor reversing device of the shutdown indoor unit exceeds the second preset time t 2 And when the refrigerant flows into the defrosting mode, the four-way reversing valve of the outdoor unit is operated in a reversing mode, so that the refrigerant flows in a switching mode.
6. The multi-connected frost control method according to claim 5, wherein the second temperature threshold T is 2 Set to 20-30 ℃ for a second preset time t 2 Setting for 1-5 min.
7. The multi-online defrosting control method according to claim 1 or 5, wherein after defrosting is finished, the defrosting mode is exited, and the operation state of the indoor unit is controlled according to the temperature of the indoor unit and/or the duration of time after exiting the defrosting mode.
8. The multi-connected frost control method according to claim 7,
pipe temperature T of indoor unit in shutdown 23 Not exceeding a third temperature threshold T 3 When the indoor unit is started, the current state operation of the shutdown indoor unit is maintained, meanwhile, the reversing device of the startup indoor unit acts, the main pipeline is connected with the pipeline of the startup indoor unit again, the throttle valve of the startup indoor unit is opened, and the startup indoor unit continues to operateHeating operation;
pipe temperature T of indoor unit in shutdown 23 Exceeds a third temperature threshold T 3 When the time or after defrosting is quitted reaches a third time threshold t 3 And when the air conditioner is in the off state, the throttle valve of the off indoor unit is closed, the reversing device of the off indoor unit acts, and the off indoor unit pipeline is disconnected with the main pipeline.
9. The multi-connected defrosting control method according to claim 7, wherein the pipe temperature T of the indoor unit at startup is T 23 Exceeds a fourth temperature threshold T 4 When the time or after defrosting is quitted reaches a fourth time threshold t 4 And when the air conditioner is started, the fan of the indoor unit is recovered to the state before defrosting, otherwise, the indoor unit is kept running at a low wind level.
10. A multi-on-line system characterized by being capable of performing the multi-on-line frost control method of any one of claims 1 to 9.
CN202210949672.1A 2022-08-09 2022-08-09 Multi-online defrosting control method and multi-online system Pending CN115235099A (en)

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JPH05203296A (en) * 1992-01-28 1993-08-10 Mitsubishi Heavy Ind Ltd Method of operation of air conditioner
JP2002147879A (en) * 2000-11-14 2002-05-22 Hitachi Ltd Multi-zone air conditioner and defrosting control method for the same
CN101245957A (en) * 2007-02-13 2008-08-20 珠海格力电器股份有限公司 Air-conditioning unit for meanwhile refrigerating and heating
CN101769580A (en) * 2009-01-06 2010-07-07 珠海格力电器股份有限公司 Air conditioner heat pump hot water unit and working method thereof
CN104061651A (en) * 2013-03-20 2014-09-24 珠海格力电器股份有限公司 Multi-unit air conditioner, multi-unit defrosting control system and multi-unit defrosting control method
CN104748464A (en) * 2013-12-25 2015-07-01 珠海格力电器股份有限公司 Multiple on-line defrosting method and device of air conditioning system and air conditioner
CN109458699A (en) * 2018-11-08 2019-03-12 珠海格力电器股份有限公司 Multi-connected machine defrosting method, device, storage medium, computer equipment and air-conditioning
CN114484744A (en) * 2022-02-18 2022-05-13 宁波奥克斯电气股份有限公司 Air conditioner defrosting method and multi-connected air conditioning system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05203296A (en) * 1992-01-28 1993-08-10 Mitsubishi Heavy Ind Ltd Method of operation of air conditioner
JP2002147879A (en) * 2000-11-14 2002-05-22 Hitachi Ltd Multi-zone air conditioner and defrosting control method for the same
CN101245957A (en) * 2007-02-13 2008-08-20 珠海格力电器股份有限公司 Air-conditioning unit for meanwhile refrigerating and heating
CN101769580A (en) * 2009-01-06 2010-07-07 珠海格力电器股份有限公司 Air conditioner heat pump hot water unit and working method thereof
CN104061651A (en) * 2013-03-20 2014-09-24 珠海格力电器股份有限公司 Multi-unit air conditioner, multi-unit defrosting control system and multi-unit defrosting control method
CN104748464A (en) * 2013-12-25 2015-07-01 珠海格力电器股份有限公司 Multiple on-line defrosting method and device of air conditioning system and air conditioner
CN109458699A (en) * 2018-11-08 2019-03-12 珠海格力电器股份有限公司 Multi-connected machine defrosting method, device, storage medium, computer equipment and air-conditioning
CN114484744A (en) * 2022-02-18 2022-05-13 宁波奥克斯电气股份有限公司 Air conditioner defrosting method and multi-connected air conditioning system

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