CN106322558B - Multi-split air conditioner system, outdoor unit of multi-split air conditioner system, and defrosting control method and device - Google Patents

Multi-split air conditioner system, outdoor unit of multi-split air conditioner system, and defrosting control method and device Download PDF

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Publication number
CN106322558B
CN106322558B CN201610814476.8A CN201610814476A CN106322558B CN 106322558 B CN106322558 B CN 106322558B CN 201610814476 A CN201610814476 A CN 201610814476A CN 106322558 B CN106322558 B CN 106322558B
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CN
China
Prior art keywords
outdoor unit
valve
unit module
defrosting
air conditioner
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Application number
CN201610814476.8A
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Chinese (zh)
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CN106322558A (en
Inventor
李宏伟
许永锋
梁伯启
卜其辉
董世龙
吴晓鸿
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
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Priority to CN201610814476.8A priority Critical patent/CN106322558B/en
Publication of CN106322558A publication Critical patent/CN106322558A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/41Defrosting; Preventing freezing

Abstract

the invention provides a multi-split air conditioner system, an outdoor unit thereof, and a defrosting control method and device, wherein the outdoor unit comprises: a plurality of outdoor unit modules arranged in parallel, each outdoor unit module comprising: the system comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, a gas-liquid separator, a first stop valve, a second stop valve, a first valve and a second valve; four ports of the four-way valve are respectively connected to an outlet of the compressor, a first port of the outdoor heat exchanger, an inlet of the gas-liquid separator and a first stop valve, a second port of the outdoor heat exchanger is connected to a second stop valve through a throttling component, and an outlet of the gas-liquid separator is connected to an inlet of the compressor; the first end of the first valve is connected to the second port of the four-way valve, the second end of the first valve is connected to the fourth port of the four-way valve, the first end of the second valve is connected to the inlet of the gas-liquid separator, and the second end of the second valve is connected to a pipeline between the second port of the outdoor heat exchanger and the second stop valve.

Description

Multi-split air conditioner system, outdoor unit of multi-split air conditioner system, and defrosting control method and device
Technical Field
the invention relates to the technical field of air conditioners, in particular to an outdoor unit of a multi-split air conditioner system, the multi-split air conditioner system, a defrosting control method of the multi-split air conditioner system and a defrosting control device of the multi-split air conditioner system.
Background
At present, the requirement of users on the comfort of the air conditioner is increasingly improved, and particularly the requirement on the heating effect of the air conditioner is increased. However, when the air conditioner system is operated for heating in a high humidity environment and a low temperature environment, the outdoor heat exchanger is prone to frost formation, and in order to ensure reliable and efficient heating of the air conditioner system, the system needs to be defrosted after a certain period of heating operation. However, when the existing air conditioner system is operated during defrosting, the indoor unit cannot continue to heat, so that the indoor temperature is reduced, and the use experience of a user is seriously influenced.
disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
Therefore, an object of the present invention is to provide a new outdoor unit of a multi-split air conditioner system, which can complete defrosting of outdoor unit modules requiring defrosting while ensuring continuous heating of the indoor unit, thereby greatly improving the comfort of the air conditioner system.
The invention also provides a multi-split air conditioner system, a defrosting control method and a defrosting control device thereof.
To achieve the above object, according to an embodiment of a first aspect of the present invention, there is provided an outdoor unit of a multi-split air conditioner system, including: a plurality of outdoor unit modules arranged in parallel, each of the outdoor unit modules comprising: the system comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, a gas-liquid separator, a first stop valve, a second stop valve, a first valve and a second valve;
wherein four ports of the four-way valve are respectively connected to an outlet of the compressor, a first port of the outdoor heat exchanger, an inlet of the gas-liquid separator and the first stop valve, a second port of the outdoor heat exchanger is connected to the second stop valve through the throttling component, and an outlet of the gas-liquid separator is connected to the inlet of the compressor;
The first end of the first valve is connected to a first position on a pipeline between the second port of the four-way valve and the first port of the outdoor heat exchanger, the second end of the first valve is connected to a pipeline between the fourth port of the four-way valve and the first stop valve, the first end of the second valve is connected to an inlet of the gas-liquid separator, and the second end of the second valve is connected to a pipeline between the second port of the outdoor heat exchanger and the second stop valve.
according to the outdoor unit of the multi-split air conditioner system, the outdoor unit of the multi-split air conditioner system comprises a plurality of outdoor unit modules which are arranged in parallel, and each outdoor unit module is provided with the first valve and the second valve, so that when any outdoor unit module needs defrosting, the first valve and the second valve can be controlled to be opened, other outdoor unit modules are controlled to continue heating operation, high-temperature and high-pressure refrigerants in other outdoor unit modules enter the outdoor unit module needing defrosting through the first stop valve, then enter the outdoor heat exchanger in the outdoor unit module needing defrosting through the first valve to defrost, the refrigerants flowing out of the outdoor heat exchanger enter the gas-liquid separator through the second valve, and finally return to the compressor to continue circulation. Therefore, the outdoor unit of the multi-split air conditioner system provided by the invention can complete defrosting of the outdoor unit module needing defrosting while ensuring continuous heating of the indoor unit, effectively ensures the heating effect of the indoor unit, greatly improves the use comfort of the air conditioner system, and is beneficial to improving the use experience of users.
the outdoor unit of the multi-split air conditioner system according to the above embodiment of the present invention may further have the following technical features:
According to an embodiment of the present invention, each of the outdoor unit modules further includes: and the third valve is arranged on a pipeline between the second port of the four-way valve and the first position.
in this embodiment, the third valve is disposed on the pipeline between the second port of the four-way valve and the first position, so that when any outdoor unit module is defrosted, the first valve and the second valve in the outdoor unit module are controlled to be opened, and the third valve is controlled to be closed, thereby preventing the refrigerant after passing through the first valve from returning to the compressor through the four-way valve to affect the defrosting effect of the outdoor heat exchanger.
according to an embodiment of the second aspect of the present invention, there is also provided a multi-split air conditioner system, including: in the outdoor unit of the multi-split air conditioner system according to any one of the above embodiments, the first stop valves of all the outdoor unit modules in the outdoor unit are connected, and the second stop valves of all the outdoor unit modules are connected; and a first port of a refrigerant channel in each indoor unit is connected to the first stop valve of each outdoor unit module, and a second port of the refrigerant channel in each indoor unit is connected to the second stop valve of each outdoor unit module.
According to an embodiment of a third aspect of the present invention, there is further provided a defrosting control method for a multi-split air conditioner system, for performing defrosting control on the multi-split air conditioner system in the above embodiment, where the defrosting control method includes: when the multi-split air conditioner system is in heating operation, controlling the first valve and the second valve in all the outdoor unit modules to be closed; and when determining that any outdoor unit module needs defrosting operation, controlling the first valve and the second valve in any outdoor unit module to be opened.
according to the defrosting control method of the multi-split air conditioner system, when the multi-split air conditioner system is in heating operation, the first valves and the second valves in all the outdoor unit modules are controlled to be closed, so that normal heating operation of the air conditioner system can be ensured. When any outdoor unit module needs defrosting operation, the first valve and the second valve in the outdoor unit module are controlled to be opened, so that high-temperature and high-pressure refrigerants in other outdoor unit modules in heating operation can enter the outdoor unit module needing defrosting through the first stop valve, then enter the outdoor heat exchanger in the outdoor unit module needing defrosting through the first valve to defrost, the defrosting of the outdoor unit module needing defrosting can be completed while the indoor unit is guaranteed to continuously heat, the heating effect of the indoor unit is effectively guaranteed, the use comfort of the air conditioner system is greatly improved, and the use experience of users is favorably improved.
For the outdoor unit module needing defrosting, the compressor of the outdoor unit module can be controlled to stop running, and the compressor of the outdoor unit module can also be controlled to continue running.
When it is determined that any outdoor unit module needs to perform defrosting operation, on the basis of controlling the opening of the first valve and the second valve in any outdoor unit module, other outdoor unit modules need to be controlled to continue heating operation to ensure that the indoor unit can continuously heat, specifically, the following three embodiments are provided:
the first embodiment is as follows:
When it is determined that any outdoor unit module needs to be defrosted, the method further comprises the following steps: and controlling all outdoor unit modules except any outdoor unit module in all the outdoor unit modules to perform heating operation.
in this embodiment, after the first valve and the second valve in the outdoor unit module requiring defrosting are controlled to be opened, all the remaining outdoor unit modules need to be controlled to perform heating operation, so as to ensure the heating effect of the multi-split air conditioner system.
Example two:
When it is determined that any outdoor unit module needs to be defrosted, the method further comprises the following steps: and controlling the outdoor unit modules, except any outdoor unit module, of all the outdoor unit modules to continue heating operation.
in this embodiment, after controlling the first and second valves in the outdoor unit module requiring defrosting to be opened, only the outdoor unit module currently in heating operation may be controlled to continue heating operation.
example three:
When it is determined that any outdoor unit module needs to be defrosted, the method further comprises the following steps: acquiring the capacity requirements of the indoor units; determining the number of outdoor unit modules needing heating operation according to the capacity requirements of the indoor units; and controlling the working states of the outdoor unit modules except any outdoor unit module in all the outdoor unit modules according to the determined number of the outdoor unit modules needing heating operation.
In this embodiment, the number of outdoor unit modules that need to be heated is determined according to the capacity requirement of the indoor unit, so that the number of the opened outdoor unit modules can be ensured to be adapted to the capacity requirement of the indoor unit.
According to an embodiment of the present invention, the defrosting control method of a multi-split air conditioner system further includes: after defrosting of any outdoor unit module is completed, the first valve and the second valve in any outdoor unit module are controlled to be closed.
In this embodiment, the outdoor unit module can continue the heating operation by controlling the first and second valves in the outdoor unit module to be closed after defrosting of any outdoor unit module is completed.
According to an embodiment of the present invention, in a case where a third valve is provided on a pipe between the second port of the four-way valve and the first position in each of the outdoor unit modules, the defrosting control method further includes: when the multi-split air conditioner system is in heating operation, controlling the third valves in all the outdoor unit modules to be opened; controlling the third valve in any outdoor unit module to be closed when the outdoor unit module is determined to need defrosting operation; and after defrosting of any outdoor unit module is finished, controlling the third valve in any outdoor unit module to be opened.
In this embodiment, when the multi-split air conditioner system is in heating operation, the third valves in all the outdoor unit modules are controlled to be opened, so that normal heating operation of each outdoor unit module can be ensured; when it is determined that any outdoor unit module needs defrosting operation, the third valve in the outdoor unit module is controlled to be closed, so that the phenomenon that the defrosting effect of the outdoor heat exchanger is influenced because the refrigerant passing through the first valve returns to the compressor through the four-way valve can be avoided; after defrosting of any outdoor unit module is completed, a third valve in the outdoor unit module is controlled to be opened, so that the outdoor unit module can continue heating operation.
According to an embodiment of a fourth aspect of the present invention, there is also provided a defrosting control device of a multi-split air conditioner system, configured to perform defrosting control on the multi-split air conditioner system described in the above embodiments, the defrosting control device including: and the control unit is used for controlling the first valve and the second valve in all the outdoor unit modules to be closed when the multi-split air conditioner system is in heating operation, and controlling the first valve and the second valve in any outdoor unit module to be opened when any outdoor unit module needs defrosting operation.
According to the defrosting control device of the multi-split air conditioner system, the first valves and the second valves in all the outdoor unit modules are controlled to be closed when the multi-split air conditioner system is in heating operation, so that the normal heating operation of the air conditioner system can be ensured. When any outdoor unit module needs defrosting operation, the first valve and the second valve in the outdoor unit module are controlled to be opened, so that high-temperature and high-pressure refrigerants in other outdoor unit modules in heating operation can enter the outdoor unit module needing defrosting through the first stop valve, then enter the outdoor heat exchanger in the outdoor unit module needing defrosting through the first valve to defrost, the defrosting of the outdoor unit module needing defrosting can be completed while the indoor unit is guaranteed to continuously heat, the heating effect of the indoor unit is effectively guaranteed, the use comfort of the air conditioner system is greatly improved, and the use experience of users is favorably improved.
For the outdoor unit module needing defrosting, the compressor of the outdoor unit module can be controlled to stop running, and the compressor of the outdoor unit module can also be controlled to continue running.
When it is determined that any outdoor unit module needs to perform a defrosting operation, the control unit further needs to control other outdoor unit modules to continue heating operation to ensure that the indoor unit can continuously heat on the basis of controlling the first valve and the second valve in any outdoor unit module to be opened, specifically, the following three embodiments:
the first embodiment is as follows:
The control unit is further configured to: and when any outdoor unit module needs defrosting operation, controlling all outdoor unit modules except any outdoor unit module in all the outdoor unit modules to perform heating operation.
in this embodiment, after the first valve and the second valve in the outdoor unit module requiring defrosting are controlled to be opened, all the remaining outdoor unit modules need to be controlled to perform heating operation, so as to ensure the heating effect of the multi-split air conditioner system.
Example two:
The control unit is further configured to: and when any outdoor unit module needs defrosting operation, controlling the outdoor unit modules, except any outdoor unit module, of all the outdoor unit modules and currently performing heating operation to continue heating operation.
In this embodiment, after controlling the first and second valves in the outdoor unit module requiring defrosting to be opened, only the outdoor unit module currently in heating operation may be controlled to continue heating operation.
Example three:
The control unit includes: the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the capacity requirements of the indoor units when any outdoor unit module needs to perform defrosting operation; the determining unit is used for determining the number of outdoor unit modules needing heating operation according to the capacity requirements of the indoor units; and the execution unit is used for controlling the working states of the outdoor unit modules except any outdoor unit module in all the outdoor unit modules according to the number of the outdoor unit modules needing heating operation determined by the determination unit.
in this embodiment, the number of outdoor unit modules that need to be heated is determined according to the capacity requirement of the indoor unit, so that the number of the opened outdoor unit modules can be ensured to be adapted to the capacity requirement of the indoor unit.
According to an embodiment of the invention, the control unit is further configured to: after defrosting of any outdoor unit module is completed, the first valve and the second valve in any outdoor unit module are controlled to be closed.
in this embodiment, the outdoor unit module can continue the heating operation by controlling the first and second valves in the outdoor unit module to be closed after defrosting of any outdoor unit module is completed.
According to an embodiment of the present invention, in a case where a third valve is provided on a pipe between the second port of the four-way valve and the first position in each of the outdoor unit modules, the control unit is further configured to: when the multi-split air conditioner system is in heating operation, controlling the third valves in all the outdoor unit modules to be opened; controlling the third valve in any outdoor unit module to be closed when the outdoor unit module is determined to need defrosting operation; and after defrosting of any outdoor unit module is finished, controlling the third valve in any outdoor unit module to be opened.
in this embodiment, when the multi-split air conditioner system is in heating operation, the third valves in all the outdoor unit modules are controlled to be opened, so that normal heating operation of each outdoor unit module can be ensured; when it is determined that any outdoor unit module needs defrosting operation, the third valve in the outdoor unit module is controlled to be closed, so that the phenomenon that the defrosting effect of the outdoor heat exchanger is influenced because the refrigerant passing through the first valve returns to the compressor through the four-way valve can be avoided; after defrosting of any outdoor unit module is completed, a third valve in the outdoor unit module is controlled to be opened, so that the outdoor unit module can continue heating operation.
additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
Fig. 1 illustrates a schematic configuration diagram of a multi-split air conditioner system according to an embodiment of the present invention;
fig. 2 is a schematic structural view illustrating an outdoor unit module according to a first embodiment of the present invention;
fig. 3 is a schematic view illustrating an outdoor unit module according to a second embodiment of the present invention;
Fig. 4 is a flowchart illustrating a defrost control method of a multi-split air conditioner system according to a first embodiment of the present invention;
Fig. 5 is a flowchart illustrating a defrost control method of a multi-split air conditioner system according to a second embodiment of the present invention;
Fig. 6 is a schematic block diagram illustrating a defrost control apparatus of a multi-split air conditioner system according to an embodiment of the present invention;
Fig. 7 shows an internal structural diagram of the control unit shown in fig. 6.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 illustrates a schematic configuration diagram of a multi-split air conditioner system according to an embodiment of the present invention.
As shown in fig. 1, a multi-split air conditioner system according to an embodiment of the present invention includes: an outdoor unit and a plurality of indoor units 2 arranged in parallel. The outdoor unit includes a plurality of outdoor unit modules 1 (only 4 outdoor unit modules are illustrated in fig. 1 as an example, in other embodiments of the present invention, the number of the outdoor unit modules 1 may be 2 or more than 2), the first stop valves 11 of all the outdoor unit modules 1 in the outdoor unit are connected, the second stop valves 12 of all the outdoor unit modules 1 are connected, the first port of the refrigerant channel in each indoor unit is connected to the first stop valve 11 of each outdoor unit module 1, and the second port of the refrigerant channel in each indoor unit is connected to the second stop valve 12 of each outdoor unit module 1.
Each outdoor unit module 1 of the outdoor units of the multi-split air conditioner system has the same structure, and specifically, as shown in fig. 2, each outdoor unit module 1 includes: a compressor 13, a four-way valve 14, an outdoor heat exchanger 15, a throttling part 16, a gas-liquid separator 17, a first stop valve 11, a second stop valve 12, a first valve 18 and a second valve 19. The compressor 13 may be a single compressor module, or may be formed by connecting a plurality of compressor modules in parallel, and fig. 2 shows that two compressor modules are connected in parallel to communicate with the compressor 13.
four ports of the four-way valve 14 are respectively connected to an outlet of the compressor 13, a first port of the outdoor heat exchanger 15, an inlet of the gas-liquid separator 17, and the first cut-off valve 11, a second port of the outdoor heat exchanger 15 is connected to the second cut-off valve 12 through a throttling member 16, and an outlet of the gas-liquid separator 17 is connected to an inlet of the compressor 13. A first end of the first valve 18 is connected to a first position (position a shown in the drawing) on a pipe between the second port of the four-way valve 14 and the first port of the outdoor heat exchanger 15, a second end of the first valve 18 is connected to a pipe between the fourth port of the four-way valve 14 and the first cut-off valve 11, a first end of the second valve 19 is connected to an inlet of the gas-liquid separator 17, and a second end of the second valve 19 is connected to a pipe between the second port of the outdoor heat exchanger 15 and the second cut-off valve 12.
Specifically, because the outdoor unit of the multi-split air conditioner system includes a plurality of outdoor unit modules 1 arranged in parallel, and each outdoor unit module 1 is provided with a first valve 18 and a second valve 19, when any outdoor unit module 1 needs defrosting, the first valve 18 and the second valve 19 can be controlled to open, and other outdoor unit modules 1 are controlled to continue heating operation, so that high-temperature and high-pressure refrigerant in other outdoor unit modules 1 can enter the outdoor unit module 1 needing defrosting through the first stop valve 11, then enter the outdoor heat exchanger 15 in the outdoor unit module 1 needing defrosting through the first valve 18 to defrost the outdoor heat exchanger, and the refrigerant flowing out of the outdoor heat exchanger 15 enters the gas-liquid separator 17 through the second valve 19, and finally returns to the compressor 13 to continue circulation. Therefore, the outdoor unit of the multi-split air conditioner system provided by the invention can complete defrosting of the outdoor unit module 1 needing defrosting while ensuring continuous heating of the indoor unit, effectively ensures the heating effect of the indoor unit, greatly improves the use comfort of the air conditioner system, and is beneficial to improving the use experience of users.
The throttle member 16 is in an open state during both heating operation and defrosting of the outdoor unit module 1.
In order to prevent the refrigerant after passing through the first valve 18 from returning to the compressor 13 through the four-way valve 14 and affecting the defrosting effect of the outdoor heat exchanger 15, as shown in fig. 3, a third valve 3 is further provided in a pipe between the second port of the four-way valve 14 and the first position (position a shown in the figure). In this way, when defrosting any outdoor unit module 1, the first valve 18 and the second valve 19 in the outdoor unit module 1 are controlled to be opened, and the third valve 3 is controlled to be closed, so that the refrigerant passing through the first valve 18 is prevented from returning to the compressor 13 through the four-way valve 14.
the first valve 18, the second valve 19 and the third valve 3 may be all types of valves that are electrically controlled, such as solenoid valves, electronic expansion valves, etc.
based on the structure of the outdoor unit module shown in fig. 2, the defrosting control method for the multi-split air conditioner system according to the present invention, as shown in fig. 4, includes:
and step S40, controlling the first valves and the second valves of all the outdoor unit modules to be closed when the multi-split air conditioner system is in heating operation.
step S42, when it is determined that any outdoor unit module needs to perform a defrosting operation, controlling a first valve and a second valve in the any outdoor unit module to open.
specifically, when the multi-split air conditioner system is in heating operation, the first valves and the second valves in all the outdoor unit modules are controlled to be closed, so that the normal heating operation of the air conditioner system can be ensured. When any outdoor unit module needs defrosting operation, the first valve and the second valve in the outdoor unit module are controlled to be opened, so that high-temperature and high-pressure refrigerants in other outdoor unit modules in heating operation can enter the outdoor unit module needing defrosting through the first stop valve, then enter the outdoor heat exchanger in the outdoor unit module needing defrosting through the first valve to defrost, the defrosting of the outdoor unit module needing defrosting can be completed while the indoor unit is guaranteed to continuously heat, the heating effect of the indoor unit is effectively guaranteed, the use comfort of the air conditioner system is greatly improved, and the use experience of users is favorably improved.
for the outdoor unit module needing defrosting, the compressor of the outdoor unit module can be controlled to stop running, and the compressor of the outdoor unit module can also be controlled to continue running.
When it is determined that any outdoor unit module needs to be defrosted, on the basis of controlling the opening of the first valve and the second valve in any outdoor unit module, other outdoor unit modules need to be controlled to continue heating operation to ensure that the indoor unit can continuously heat, specifically, the following three embodiments are provided:
The first embodiment is as follows:
When determining that any outdoor unit module needs to be defrosted, the method further comprises the following steps: and controlling all outdoor unit modules except any outdoor unit module in all the outdoor unit modules to perform heating operation.
In this embodiment, after the first valve and the second valve in the outdoor unit module requiring defrosting are controlled to be opened, all the remaining outdoor unit modules need to be controlled to perform heating operation, so as to ensure the heating effect of the multi-split air conditioner system.
example two:
When determining that any outdoor unit module needs to be defrosted, the method further comprises the following steps: and controlling the outdoor unit modules, except any outdoor unit module, in all the outdoor unit modules and in the current heating operation to continue heating operation.
in this embodiment, after controlling the first and second valves in the outdoor unit module requiring defrosting to be opened, only the outdoor unit module currently in heating operation may be controlled to continue heating operation.
example three:
When determining that any outdoor unit module needs to be defrosted, the method further comprises the following steps: acquiring the capacity requirements of the indoor units; determining the number of outdoor unit modules needing heating operation according to the capacity requirements of the indoor units; and controlling the working states of the outdoor unit modules except any outdoor unit module in all the outdoor unit modules according to the determined number of the outdoor unit modules needing heating operation.
In this embodiment, the number of outdoor unit modules that need to be heated is determined according to the capacity requirement of the indoor unit, so that the number of the opened outdoor unit modules can be ensured to be adapted to the capacity requirement of the indoor unit.
Further, the defrosting control method of the multi-split air conditioner system further includes: after defrosting of any outdoor unit module is completed, the first valve and the second valve in any outdoor unit module are controlled to be closed.
In this embodiment, the outdoor unit module can continue the heating operation by controlling the first and second valves in the outdoor unit module to be closed after defrosting of any outdoor unit module is completed.
Based on the structure of the outdoor unit module shown in fig. 3, the defrosting control method for the multi-split air conditioner system according to the present invention further includes, on the basis of the defrosting control method shown in fig. 4:
When the multi-split air conditioner system is in heating operation, controlling the opening of third valves in all the outdoor unit modules; when it is determined that any outdoor unit module needs defrosting operation, controlling a third valve in the any outdoor unit module to be closed; and after defrosting of any outdoor unit module is finished, controlling a third valve in any outdoor unit module to be opened.
In this embodiment, when the multi-split air conditioner system is in heating operation, the third valves in all the outdoor unit modules are controlled to be opened, so that normal heating operation of each outdoor unit module can be ensured; when it is determined that any outdoor unit module needs defrosting operation, the third valve in the outdoor unit module is controlled to be closed, so that the phenomenon that the defrosting effect of the outdoor heat exchanger is influenced because the refrigerant passing through the first valve returns to the compressor through the four-way valve can be avoided; after defrosting of any outdoor unit module is completed, a third valve in the outdoor unit module is controlled to be opened, so that the outdoor unit module can continue heating operation.
To further explain the defrosting control method of the present invention, the following will take the outdoor unit of the multi-split air conditioner system including 4 outdoor unit modules as an example based on the structure of the outdoor unit modules shown in fig. 3, and refer to fig. 5 to explain the defrosting control method of the present invention in detail.
As shown in fig. 5, the defrost control method includes:
In step 502, when the multi-split air conditioner system is in heating operation, the first valves and the second valves in all the outdoor unit modules are closed, and the third valves are opened. At this time, the throttling part in each outdoor unit module is also in an open state.
step 504, judging whether the outdoor unit module a needs defrosting, if so, executing step 506; otherwise, step 516 is performed.
Step 506, judging whether other outdoor unit modules are in heating operation, if so, executing step 510; otherwise, step 508 is performed.
Step 508, force other outdoor unit modules to perform weighted average according to the current load + M (constant), and then start heating operation for T minutes, and then execute step 510. Where M is to correct the current load. The T minutes may be a defrosting time period of the outdoor unit module a.
in step 510, the first valve and the second valve of the outdoor unit module a are opened, and the third valve is controlled to be closed.
Step 512, determining whether the outdoor unit module a is defrosted, if yes, executing step 514; otherwise, go back to execute step 510.
In step 514, the first valve and the second valve of the outdoor unit module a are closed, the third valve is opened, and the outdoor unit module a returns to the state before defrosting. At this time, other outdoor unit modules may also be restored to the pre-defrost state.
Step 516, judging whether the outdoor unit module b needs defrosting, if so, executing step 518; otherwise, step 528 is performed.
Step 518, determining whether other outdoor unit modules are in heating operation, if yes, executing step 522; otherwise, step 520 is performed.
Step 520, forcing other outdoor unit modules to perform weighted average according to the current load + M (constant), and then starting heating operation for T minutes, and then executing step 522. Where M is to correct the current load. The T minutes may be a defrosting time period of the outdoor unit module b.
In step 522, the first valve and the second valve of the outdoor unit module b are opened, and the third valve is controlled to be closed.
Step 524, determining whether the defrosting of the outdoor unit module b is completed, if yes, executing step 526; otherwise, return to perform step 522.
In step 526, the first valve and the second valve of the outdoor unit module b are closed, the third valve is opened, and the state returns to the state before defrosting. At this time, other outdoor unit modules may also be restored to the pre-defrost state.
Step 528, determining whether the outdoor unit module c needs defrosting, if yes, executing step 530; otherwise, step 540 is performed.
Step 530, judging whether other outdoor unit modules are in heating operation, if so, executing step 534; otherwise, step 532 is performed.
In step 532, the other outdoor unit modules are forced to perform weighted average according to the current load + M (constant), and then the heating operation is started for T minutes, and then step 534 is executed. Where M is to correct the current load. The T minutes may be a defrosting time period of the outdoor unit module c.
in step 534, the first valve and the second valve of the outdoor unit module c are opened, and the third valve is controlled to be closed.
Step 536, determining whether the outdoor unit module c has finished defrosting, if yes, executing step 538; otherwise, return to execute step 534.
in step 538, the first valve and the second valve of the outdoor unit module c are closed, the third valve is opened, and the outdoor unit module c returns to the state before defrosting. At this time, other outdoor unit modules may also be restored to the pre-defrost state.
step 540, judging whether the outdoor unit module d needs defrosting, if so, executing step 542; otherwise, the procedure returns to step 502.
Step 542, judging whether other outdoor unit modules are in heating operation, if so, executing step 546; otherwise, step 544 is performed.
in step 544, the other outdoor unit modules are forced to perform weighted average according to the current load + M (constant), and then the heating operation is started for T minutes, and then step 546 is executed. Where M is to correct the current load. The T minutes may be a defrosting time period of the outdoor unit module d.
in step 546, the first valve and the second valve of the outdoor unit module d are opened, and the third valve is controlled to be closed.
Step 548, judging whether the defrosting of the outdoor unit module d is finished, if so, executing step 550; otherwise, return to perform step 546.
In step 550, the first valve and the second valve of the outdoor unit module d are closed, the third valve is opened, and the state before defrosting is returned. At this time, other outdoor unit modules may also be restored to the pre-defrost state.
In the defrosting control method shown in fig. 5, whether each outdoor unit module needs to be defrosted is determined one by one, and in other embodiments of the present invention, which outdoor unit module needs to be defrosted may be determined comprehensively, that is, the outdoor unit module which needs to be defrosted is determined directly from a plurality of outdoor unit modules according to the detection result. In addition, in the defrosting control method shown in fig. 5, when it is determined that a certain outdoor unit module needs defrosting, all other outdoor unit modules are forced to perform heating operation, in other embodiments of the present invention, the current heating outdoor unit module may be controlled to continue heating operation, or the number of outdoor unit modules that need heating operation is determined according to the capacity requirement of the indoor unit, so as to control the operation of the outdoor unit module.
Based on the structure of the outdoor unit module shown in fig. 2, the present invention further provides a defrosting control device for a multi-split air conditioner system, specifically as shown in fig. 6, including: a control unit 602, configured to control the first and second valves of all the outdoor unit modules to be closed when the multi-split air conditioner system is in heating operation, and to control the first and second valves of any outdoor unit module to be opened when any outdoor unit module needs to perform a defrosting operation.
Specifically, when the multi-split air conditioner system is in heating operation, the first valves and the second valves in all the outdoor unit modules are controlled to be closed, so that the normal heating operation of the air conditioner system can be ensured. When any outdoor unit module needs defrosting operation, the first valve and the second valve in the outdoor unit module are controlled to be opened, so that high-temperature and high-pressure refrigerants in other outdoor unit modules in heating operation can enter the outdoor unit module needing defrosting through the first stop valve, then enter the outdoor heat exchanger in the outdoor unit module needing defrosting through the first valve to defrost, the defrosting of the outdoor unit module needing defrosting can be completed while the indoor unit is guaranteed to continuously heat, the heating effect of the indoor unit is effectively guaranteed, the use comfort of the air conditioner system is greatly improved, and the use experience of users is favorably improved.
For the outdoor unit module needing defrosting, the compressor of the outdoor unit module can be controlled to stop running, and the compressor of the outdoor unit module can also be controlled to continue running.
When it is determined that any outdoor unit module needs to perform a defrosting operation, the control unit 602 needs to control other outdoor unit modules to continue heating operation to ensure that the indoor unit can continuously heat on the basis of controlling the first valve and the second valve in the any outdoor unit module to be opened, specifically, the following three embodiments:
the first embodiment is as follows:
The control unit 602 is further configured to: and when any outdoor unit module needs defrosting operation, controlling all outdoor unit modules except any outdoor unit module in all the outdoor unit modules to perform heating operation.
in this embodiment, after the first valve and the second valve in the outdoor unit module requiring defrosting are controlled to be opened, all the remaining outdoor unit modules need to be controlled to perform heating operation, so as to ensure the heating effect of the multi-split air conditioner system.
Example two:
The control unit 602 is further configured to: and when any outdoor unit module needs defrosting operation, controlling the outdoor unit modules, except any outdoor unit module, of all the outdoor unit modules and currently performing heating operation to continue heating operation.
In this embodiment, after controlling the first and second valves in the outdoor unit module requiring defrosting to be opened, only the outdoor unit module currently in heating operation may be controlled to continue heating operation.
example three:
As shown in fig. 7, the control unit 602 includes: an acquisition unit 6022, a determination unit 6024, and an execution unit 6026.
the obtaining unit 6022 is configured to obtain the capacity requirement of the plurality of indoor units when any outdoor unit module needs to perform a defrosting operation; the determining unit 6024 is configured to determine the number of outdoor unit modules that need to be heated according to the capacity requirements of the plurality of indoor units; the execution unit 6026 is configured to control the operating states of the outdoor unit modules, except for any outdoor unit module, of all the outdoor unit modules according to the number of the outdoor unit modules that need to be subjected to the heating operation determined by the determination unit 6024.
in this embodiment, the number of outdoor unit modules that need to be heated is determined according to the capacity requirement of the indoor unit, so that the number of the opened outdoor unit modules can be ensured to be adapted to the capacity requirement of the indoor unit.
Further, the control unit 602 is further configured to: after defrosting of any outdoor unit module is completed, the first valve and the second valve in any outdoor unit module are controlled to be closed.
In this embodiment, the outdoor unit module can continue the heating operation by controlling the first and second valves in the outdoor unit module to be closed after defrosting of any outdoor unit module is completed.
Based on the structure of the outdoor unit module shown in fig. 3, the control unit 602 is further configured to: when the multi-split air conditioner system is in heating operation, controlling the third valves in all the outdoor unit modules to be opened; controlling the third valve in any outdoor unit module to be closed when the outdoor unit module is determined to need defrosting operation; and after defrosting of any outdoor unit module is finished, controlling the third valve in any outdoor unit module to be opened.
In this embodiment, when the multi-split air conditioner system is in heating operation, the third valves in all the outdoor unit modules are controlled to be opened, so that normal heating operation of each outdoor unit module can be ensured; when it is determined that any outdoor unit module needs defrosting operation, the third valve in the outdoor unit module is controlled to be closed, so that the phenomenon that the defrosting effect of the outdoor heat exchanger is influenced because the refrigerant passing through the first valve returns to the compressor through the four-way valve can be avoided; after defrosting of any outdoor unit module is completed, a third valve in the outdoor unit module is controlled to be opened, so that the outdoor unit module can continue heating operation.
The technical scheme of the invention is described in detail in the above with reference to the attached drawings, and the invention provides a new outdoor unit of a multi-split air conditioner system, a multi-split air conditioner system with the outdoor unit and a defrosting control scheme thereof, which can complete defrosting of outdoor unit modules needing defrosting while ensuring continuous heating of the indoor unit, thereby greatly improving the use comfort of the air conditioner system.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. a multi-split air conditioner system, comprising:
An outdoor unit of a multi-split air conditioner system, the outdoor unit of the multi-split air conditioner system comprising: a plurality of outdoor unit modules arranged in parallel, each of the outdoor unit modules comprising: the system comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling component, a gas-liquid separator, a first stop valve, a second stop valve, a first valve and a second valve;
wherein four ports of the four-way valve are respectively connected to an outlet of the compressor, a first port of the outdoor heat exchanger, an inlet of the gas-liquid separator and the first stop valve, a second port of the outdoor heat exchanger is connected to the second stop valve through the throttling component, and an outlet of the gas-liquid separator is connected to the inlet of the compressor;
A first end of the first valve is connected to a first position on a pipeline between a second port of the four-way valve and a first port of the outdoor heat exchanger, a second end of the first valve is connected to a pipeline between a fourth port of the four-way valve and the first stop valve, a first end of the second valve is connected to an inlet of the gas-liquid separator, a second end of the second valve is connected to a pipeline between a second port of the outdoor heat exchanger and the second stop valve, the first stop valves of all outdoor unit modules in the outdoor unit are connected, and the second stop valves of all the outdoor unit modules are connected; and
The first port of a refrigerant channel in each indoor unit is connected to the first stop valve of each outdoor unit module, and the second port of the refrigerant channel in each indoor unit is connected to the second stop valve of each outdoor unit module;
A defrost control, said defrost control comprising: the control unit is used for controlling the first valve and the second valve in all the outdoor unit modules to be closed when the multi-split air conditioner system is in heating operation, and is used for controlling the first valve and the second valve in any outdoor unit module to be opened when any outdoor unit module needs defrosting operation;
each of the outdoor unit modules further includes:
And the third valve is arranged on a pipeline between the second port of the four-way valve and the first position.
2. the multi-split air conditioner system as claimed in claim 1, wherein the control unit is further configured to:
And when any outdoor unit module needs defrosting operation, controlling all outdoor unit modules except any outdoor unit module in all the outdoor unit modules to perform heating operation.
3. The multi-split air conditioner system as claimed in claim 1, wherein the control unit is further configured to:
And when any outdoor unit module needs defrosting operation, controlling the outdoor unit modules, except any outdoor unit module, of all the outdoor unit modules and currently performing heating operation to continue heating operation.
4. The multi-split air conditioner system as claimed in claim 1, wherein the control unit comprises:
The system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the capacity requirements of the indoor units when any outdoor unit module needs to perform defrosting operation;
The determining unit is used for determining the number of outdoor unit modules needing heating operation according to the capacity requirements of the indoor units;
And the execution unit is used for controlling the working states of the outdoor unit modules except any outdoor unit module in all the outdoor unit modules according to the number of the outdoor unit modules needing heating operation determined by the determination unit.
5. The multi-split air conditioner system as claimed in any one of claims 1 to 4, wherein the control unit is further configured to:
After defrosting of any outdoor unit module is completed, the first valve and the second valve in any outdoor unit module are controlled to be closed.
6. A multi-split air conditioner system as claimed in any one of claims 1 to 4, wherein in case that a third valve is provided on a pipe between the second port of the four-way valve and the first position in each of the outdoor unit modules, the control unit is further adapted to:
When the multi-split air conditioner system is in heating operation, controlling the third valves in all the outdoor unit modules to be opened;
controlling the third valve in any outdoor unit module to be closed when the outdoor unit module is determined to need defrosting operation;
and after defrosting of any outdoor unit module is finished, controlling the third valve in any outdoor unit module to be opened.
7. A defrosting control method of a multi-split air conditioner system for performing defrosting control of the multi-split air conditioner system as set forth in claim 1, comprising:
When the multi-split air conditioner system is in heating operation, controlling the first valve and the second valve in all the outdoor unit modules to be closed;
When it is determined that any outdoor unit module needs defrosting operation, controlling the first valve and the second valve in any outdoor unit module to be opened;
In a case where a third valve is provided on a pipe between the second port of the four-way valve in each of the outdoor unit modules and the first position, the defrosting control method further includes:
When the multi-split air conditioner system is in heating operation, controlling the third valves in all the outdoor unit modules to be opened;
Controlling the third valve in any outdoor unit module to be closed when the outdoor unit module is determined to need defrosting operation;
and after defrosting of any outdoor unit module is finished, controlling the third valve in any outdoor unit module to be opened.
8. The defrosting control method of a multi-split air conditioner system as claimed in claim 7, further comprising, when it is determined that any one of the outdoor unit modules needs to perform a defrosting operation:
And controlling all outdoor unit modules except any outdoor unit module in all the outdoor unit modules to perform heating operation.
9. the defrosting control method of a multi-split air conditioner system as claimed in claim 7, further comprising, when it is determined that any one of the outdoor unit modules needs to perform a defrosting operation:
and controlling the outdoor unit modules, except any outdoor unit module, of all the outdoor unit modules to continue heating operation.
10. The defrosting control method of a multi-split air conditioner system as claimed in claim 7, further comprising, when it is determined that any one of the outdoor unit modules needs to perform a defrosting operation:
acquiring the capacity requirements of the indoor units;
determining the number of outdoor unit modules needing heating operation according to the capacity requirements of the indoor units;
And controlling the working states of the outdoor unit modules except any outdoor unit module in all the outdoor unit modules according to the determined number of the outdoor unit modules needing heating operation.
11. The defrosting control method of a multi-split air conditioner system as claimed in any one of claims 7 to 10, further comprising:
After defrosting of any outdoor unit module is completed, the first valve and the second valve in any outdoor unit module are controlled to be closed.
CN201610814476.8A 2016-09-09 2016-09-09 Multi-split air conditioner system, outdoor unit of multi-split air conditioner system, and defrosting control method and device Active CN106322558B (en)

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CN113007865A (en) * 2021-04-20 2021-06-22 广东积微科技有限公司 Multi-outdoor-unit parallel non-reversing defrosting system and defrosting control method thereof

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US3633378A (en) * 1970-07-15 1972-01-11 Streater Ind Inc Hot gas defrosting system
CN101631994A (en) * 2006-02-20 2010-01-20 Lg电子株式会社 Air conditioning system and control method thereof
CN101424452A (en) * 2008-11-21 2009-05-06 合肥通用机械研究院 Multifunctional heat pump water heating machine easy for defrosting
KR20100069188A (en) * 2008-12-16 2010-06-24 삼성전자주식회사 System air conditioner and method for operating the same
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