CN111219803A - Multi-split air conditioner and defrosting method thereof - Google Patents
Multi-split air conditioner and defrosting method thereof Download PDFInfo
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- CN111219803A CN111219803A CN202010021957.XA CN202010021957A CN111219803A CN 111219803 A CN111219803 A CN 111219803A CN 202010021957 A CN202010021957 A CN 202010021957A CN 111219803 A CN111219803 A CN 111219803A
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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
- F24F3/00—Air-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
- F24F3/06—Air-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
- F24F3/065—Air-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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2120/00—Control inputs relating to users or occupants
- F24F2120/10—Occupancy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The application provides a multi-split air conditioner and a defrosting method thereof. The defrosting method of the multi-split air conditioner comprises the following steps: judging whether the defrosting condition is met; when the defrosting condition is met, controlling the air conditioner to enter a defrosting mode; acquiring idle internal machine information; controlling the idle internal machine to operate; the four-way valve (3) is controlled to change direction, and the control valve is adjusted, so that the working inner machine and the outer machine are jointly used as a condensation side, and the idle inner machine is used as an evaporation side. According to the defrosting method of the multi-split air conditioner, the compressor can be prevented from being stopped during defrosting, normal heating of the working inner unit is guaranteed, and user experience is improved.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to a multi-split air conditioner and a defrosting method thereof.
Background
The multi-split air conditioner is widely applied to engineering and various occasions. The common multi-connected unit mostly adopts a method of combining an outdoor unit with a plurality of indoor units. In the control of the general defrosting, the compressor needs to be stopped, the four-way valve is switched to the refrigerating mode, the indoor unit is actually refrigerated in the defrosting period in the mode, the air outlet temperature has large influence, and the user experience is influenced.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide a multi-split air conditioner and a defrosting method thereof, which can avoid the compressor from stopping during defrosting, ensure normal heating of a working indoor unit and improve user experience.
In order to solve the problems, the application provides a multi-split air conditioner, including outer machine and a plurality of parallelly connected indoor units that set up, outer machine includes the compressor, outdoor heat exchanger and cross valve, the indoor unit includes bypass pipeline and indoor heat exchange pipeline, indoor heat exchange pipeline is provided with indoor heat exchanger and choke valve on the road, be provided with first control valve on the bypass pipeline, parallelly connected formation parallel pipeline with the bypass pipeline after the outdoor heat exchange pipeline at indoor heat exchange pipeline and outdoor heat exchanger place is established ties, parallel pipeline's first end is connected to the first interface of cross valve, parallel pipeline's second end is connected to the second interface of cross valve through first pipeline, be provided with the second control valve on the first pipeline, first pipeline is connected with the indoor unit one-to-one.
According to another aspect of the present application, there is provided a defrosting method of a multi-split air conditioner, including:
judging whether the defrosting condition is met;
when the defrosting condition is met, controlling the air conditioner to enter a defrosting mode;
acquiring idle internal machine information;
controlling the idle internal machine to operate;
and the four-way valve is controlled to change the direction, and the control valve is adjusted, so that the working inner machine and the outer machine are jointly used as a condensation side, and the idle inner machine is used as an evaporation side.
Preferably, the idle indoor units comprise an idle indoor unit and a started indoor unit in the unattended room.
Preferably, the step of acquiring the idle indoor unit information includes:
detecting whether an internal machine is started;
if the internal machine is not started, judging the internal machine to be an idle internal machine; or the like, or, alternatively,
detecting whether an internal machine is started;
if the indoor unit is started, detecting whether a person is in the indoor unit;
when no person is detected in the room, the indoor unit is judged to be an idle indoor unit.
Preferably, the step of controlling the four-way valve to change direction and adjusting the control valve to make the working inner machine and the outer machine jointly serve as the condensation side and the idle inner machine serve as the evaporation side comprises:
closing a second control valve of the working internal machine;
closing a first control valve of the idle internal machine;
the refrigerant flows out of the compressor and then is divided into two paths, one path flows into the working inner machine, the other path flows into the outdoor heat exchanger, the refrigerant flowing out of the working inner machine and the refrigerant flowing out of the outdoor heat exchanger are converged and then enter the idle inner machine, and the refrigerant flows back to the compressor after passing through the idle inner machine.
Preferably, before controlling the reversing valve to reverse, the defrosting method further comprises the following steps:
acquiring operation parameters of an idle internal machine and a working internal machine;
and adjusting the opening of the throttle valve of each internal machine and the working state of each control valve according to the running parameters of the idle internal machine and the working internal machine, so that the running condition of the multi-split air conditioner meets the reversing requirement of the four-way valve.
Preferably, the step of determining whether the defrosting condition is satisfied includes:
acquiring the running time of an outdoor unit, the temperature of an outer ring and the pipe temperature of an outdoor heat exchanger;
and judging whether the defrosting condition is met according to the running time of the outdoor unit, the temperature of the outer ring and the pipe temperature of the outdoor heat exchanger.
Preferably, the defrosting method further comprises:
judging whether defrosting is clean;
when the defrosting is not clean, the defrosting step is continuously executed;
when the defrosting is clean, entering a defrosting ending stage.
Preferably, the defrosting end stage comprises:
judging whether the multi-split air conditioner meets a four-way valve reversing condition or not;
when the four-way valve reversing condition is met, controlling the four-way valve to reverse;
when the reversing condition of the four-way valve is not met, the opening degree of each internal machine throttle valve and the working state of each control valve are adjusted, so that the running condition of the multi-split air conditioner meets the reversing requirement of the four-way valve.
Preferably, after the four-way valve is reversed, the defrosting method further comprises the following steps:
controlling the information of the internal machine which is not started up in the normal heating state in the idle internal machine;
and controlling the internal machine which is not started up in the normal heating state to be shut down after preset time of heating operation.
The application provides a defrosting method of a multi-split air conditioner, which comprises the following steps: judging whether the defrosting condition is met; when the defrosting condition is met, controlling the air conditioner to enter a defrosting mode; acquiring idle internal machine information; controlling the idle internal machine to operate; and the four-way valve is controlled to change the direction, and the control valve is adjusted, so that the working inner machine and the outer machine are jointly used as a condensation side, and the idle inner machine is used as an evaporation side. This many online air conditioners is when changing frost, the indoor machine that will set aside in will setting aside for many online air conditioners can utilize the indoor machine that sets aside to absorb heat as the evaporimeter, outdoor heat exchanger and work can be exothermic jointly as the condenser, thereby when not influencing the work indoor machine and heat, can change frost to outdoor heat exchanger, the compressor does not shut down the operation during can guaranteeing to change the frost, extension compressor life, the problem that the effect attenuation is serious is heated to the work indoor machine when solving to change the frost, guarantee the work indoor machine and normally heat, improve user experience.
Drawings
Fig. 1 is a refrigerant flow diagram of a multi-split air conditioner according to an embodiment of the present application when defrosting is performed;
fig. 2 is a refrigerant flow diagram of a multi-split air conditioner in a defrosting completion stage according to an embodiment of the present application;
fig. 3 is a flowchart of a defrosting method of a multi-split air conditioner according to an embodiment of the present application.
The reference numerals are represented as:
1. a compressor; 2. an outdoor heat exchanger; 3. a four-way valve; 4. a bypass line; 5. an indoor heat exchange pipeline; 6. an indoor heat exchanger; 7. a throttle valve; 8. an outdoor heat exchange pipeline; 9. a first control valve; 10. a second control valve; 11. a first conduit.
Detailed Description
Referring to fig. 1 and 2 in combination, according to an embodiment of the present disclosure, the multi-split air conditioner includes an external unit and a plurality of internal units connected in parallel, the external unit includes a compressor 1, an outdoor heat exchanger 2 and a four-way valve 3, the internal unit includes a bypass pipeline 4 and an indoor heat exchange pipeline 5, the indoor heat exchange pipeline 5 is provided with an indoor heat exchanger 6 and a throttle valve 7, the bypass pipeline 4 is provided with a first control valve 9, the indoor heat exchange pipeline 5 and an outdoor heat exchange pipeline 8 where the outdoor heat exchanger 2 is located are connected in series and then connected in parallel with the bypass pipeline 4 to form a parallel pipeline, a first end of the parallel pipeline is connected to a first interface of the four-way valve 3, a second end of the parallel pipeline is connected to a second interface of the four-way valve 3 through a first pipeline 11, the first pipeline 11 is provided with a.
In the present application, the throttle valve 7 is, for example, a capillary tube or an electronic expansion valve, and is disposed on one side of the indoor heat exchanger 6 of each indoor unit close to the outdoor heat exchanger 2, so that when the air conditioner is in normal heating, after passing through the indoor heat exchanger 6, a refrigerant can pass through the throttle valve 7 to be throttled and then enter the outdoor heat exchanger 2 to absorb heat, thereby ensuring normal heating operation of the multi-split air conditioner. When needs change the frost to outdoor heat exchanger 2, can guarantee that the refrigerant that comes out from the compressor is through work indoor set and outdoor heat exchanger 2 back, can go into the indoor heat exchanger 6 of idle indoor set behind the choke valve 7 of idle indoor set and absorb heat, has guaranteed that the frost of outdoor heat exchanger 2 and the heating of work indoor set go on simultaneously, has improved user's use and has experienced.
The idle internal machine is an internal machine which is adjusted to be in a heat absorption state and does not influence the user experience, and the idle internal machine can comprise an internal machine which does not work originally or an internal machine which does work but is unmanned indoors, and can also comprise an internal machine which has smaller heating requirements and smaller influence of temperature change on the user or indoor objects.
In this embodiment, each internal unit all includes independent first control valve 9, choke valve 7, indoor heat exchanger 6 and second control valve 10, and each internal unit all is the independent control, can not influence the operation and the control of other internal units, consequently is convenient for carry out the switching of internal unit operating condition more, is convenient for realize the defrosting of outdoor heat exchanger 2 and the normal heating of work internal unit under the compressor does not shut down the state.
Referring to fig. 3 in combination, according to an embodiment of the present application, a defrosting method of a multi-split air conditioner includes: judging whether the defrosting condition is met; when the defrosting condition is met, controlling the air conditioner to enter a defrosting mode; acquiring idle internal machine information; controlling the idle internal machine to operate; the four-way valve 3 is controlled to change the direction, and the control valve is adjusted, so that the working inner machine and the outer machine are jointly used as a condensation side, and the idle inner machine is used as an evaporation side.
This many online air conditioners is when changing frost, the indoor set that will set aside for many online air conditioners can utilize indoor heat exchanger 6 of the indoor set that sets aside to absorb heat as the evaporimeter, indoor heat exchanger 6 of outdoor heat exchanger 2 and work indoor set can release heat jointly as the condenser, thereby when not influencing the work indoor set and heat, can change frost to outdoor heat exchanger 2, can guarantee to change the frost period compressor not shut down the operation, extension compressor life, the problem that the effect attenuation is serious is heated to the work indoor set when also can solving and change frost, guarantee the normal heating of work indoor set, and user experience is improved.
The idle internal machines comprise internal machines which are not operated and internal machines which are started in an unattended room.
The step of obtaining idle internal machine information comprises the following steps: detecting whether an internal machine is started; if the internal machine is not started, judging the internal machine to be an idle internal machine; or, detecting whether the internal machine is started; if the indoor unit is started, detecting whether a person is in the indoor unit; when no person is detected in the room, the indoor unit is judged to be an idle indoor unit.
Through judging which interior machine is idle interior machine, just can be when carrying out outdoor heat exchanger 2's defrosting, add the interior machine ranks of defrosting operation with these idle interior machines, and make the indoor heat exchanger 6 of these idle interior machines become the evaporimeter, the indoor heat exchanger 6 and the outdoor heat exchanger 2 of work interior machine become the condenser, when leading to its place indoor temperature to change owing to the state switch of these idle interior machines, this kind of change can not lead to user's travelling comfort to reduce, consequently can not influence user experience's idle interior machine through effective utilization these, the problem that the user experience reduction brought is switched in the state of just can avoiding the work interior machine, simultaneously can also utilize these idle interior machine absorptive heats to effectively defrost outdoor heat exchanger 2.
The reversing of the four-way valve 3 is controlled, and the control valve is adjusted, so that the working inner machine and the outer machine are jointly used as a condensation side, and the step of the idle inner machine as an evaporation side comprises the following steps: closing the second control valve 10 of the working internal machine; closing the first control valve 9 of the idle internal machine; the refrigerant is divided into two paths after flowing out of the compressor 1, one path flows into the working inner machine, the other path flows into the outdoor heat exchanger 2, the refrigerant flowing out of the working inner machine and the refrigerant flowing out of the outdoor heat exchanger 2 are converged and then enter the idle inner machine, and the refrigerant flows back to the compressor 1 after passing through the idle inner machine.
Referring to fig. 1 in combination, when the multi-split air conditioner of the embodiment of the present application operates in defrosting mode, it is assumed that there are two sets of indoor units, one of the sets of indoor units is a working indoor unit, the other set of indoor units is an idle indoor unit, at this time, the second control valve 10 of the working indoor unit needs to be closed, the first control valve 9 of the idle indoor unit needs to be closed, when the multi-split air conditioner operates, the refrigerant flows out from the compressor 1 through the four-way valve 3, then is divided into two paths, one path passes through the first control valve 9 of the working indoor unit, the indoor heat exchanger 6 of the working indoor unit and the throttle valve 7 of the working indoor unit, the other path passes through the outdoor heat exchanger 2, during this process, the refrigerant is condensed and released heat at the outdoor heat exchanger 2 and the indoor heat exchanger 6 at the same time, the refrigerant after the heat release flows together, then after the refrigerant after being throttled by the, enters the air suction port of the compressor through the four-way valve 3 to complete a cycle.
Before controlling the reversing valve to reverse, the defrosting method further comprises the following steps: acquiring operation parameters of an idle internal machine and a working internal machine; the opening of each internal machine throttle valve 7 and the working state of each control valve are adjusted according to the running parameters of the idle internal machine and the working internal machine, so that the running condition of the multi-split air conditioner meets the reversing requirement of the four-way valve 3, namely the high-low pressure difference between the refrigerants of the first interface and the second interface of the four-way valve 3 can meet the reversing pressure difference of the four-way valve 3. Generally speaking, when the four-way valve 3 is reversed, the operation of the multi-split air conditioner needs to meet a certain condition, otherwise, the system operation is unstable in the switching process, and even the system operation is abnormal. Therefore, before switching, it is required to determine whether the multi-split air conditioner achieves switching regulation of the four-way valve 3, when a switching condition is achieved, reversing operation of the four-way valve 3 can be performed, and if the switching condition is not achieved, the operation parameters of the multi-split air conditioner need to be adjusted, so that the operation parameters of the multi-split air conditioner meet the switching condition of the four-way valve 3.
In addition, before the multi-split air conditioner is defrosted, the step of judging whether the defrosting condition is met comprises the following steps: acquiring the running time of an outdoor unit, the temperature of an outer ring and the pipe temperature of the outdoor heat exchanger 2; and judging whether the defrosting condition is met according to the running time of the outdoor unit, the outer ring temperature and the pipe temperature of the outdoor heat exchanger 2. When the running time of the outdoor unit, the outer ring temperature and the pipe temperature of the outdoor heat exchanger 2 all reach preset conditions, it is indicated that the multi-split air conditioner meets the defrosting requirement, and defrosting needs to be carried out on the outdoor heat exchanger 2. And when the defrosting condition is not met, controlling the multi-split air conditioner to be still in a normal heating state.
The defrosting method also comprises the following steps: judging whether defrosting is clean; when the defrosting is not clean, the defrosting step is continuously executed; when the defrosting is clean, entering a defrosting ending stage.
The defrosting ending stage comprises the following steps: judging whether the multi-split air conditioner meets the reversing condition of the four-way valve 3; when the reversing condition of the four-way valve 3 is met, controlling the four-way valve 3 to reverse; and when the reversing condition of the four-way valve 3 is not met, the opening of each internal machine throttle valve 7 and the working state of each control valve are adjusted, so that the running condition of the multi-split air conditioner meets the reversing requirement of the four-way valve 3.
After the four-way valve 3 is reversed, the defrosting method further comprises the following steps: controlling the information of the internal machine which is not started up in the normal heating state in the idle internal machine; and controlling the internal machine which is not started up in the normal heating state to be shut down after preset time of heating operation.
When the idle internal machine is not started before defrosting, if the idle internal machine is directly turned off after defrosting is finished, because the idle internal machine is used as an evaporation side in the defrosting process, the icing of the internal machine can be caused in the process, the direct turning-off can cause the icing of the internal machine, or the cold air blowing phenomenon occurs when the idle internal machine is used as a working internal machine, and the adverse effect is caused on the use of the internal machine which is not started. After defrosting is finished and the multi-split air conditioner enters a normal heating state, one end of heating operation time of the internal machines which are not started up is controlled, a frost layer which is possibly generated by the internal machines which are not started up can be effectively removed, and the internal machines which are not started up are prevented from being frozen or blowing cold air during normal work.
When the multi-split air conditioner enters a normal heating state, if the idle internal machines are the internal machines which are started in the room without people, after defrosting, the idle internal machines still operate according to the state before defrosting, in the process, the frost layer generated on the evaporation side in the defrosting process can be effectively removed, and meanwhile, the indoor temperature of the multi-split air conditioner can be recovered to be normal.
Taking the multi-split air conditioner as an example, after defrosting is completed, the first control valves 9 of all the operating internal machines are closed, the second control valves 10 are opened, all the operating internal machines are used as condensation sides, and the outdoor heat exchanger 2 is used as an evaporation side, so that normal operation of the multi-split air conditioner is ensured.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (10)
1. A multi-split air conditioner is characterized by comprising an outer unit and a plurality of inner units which are arranged in parallel, wherein the outer unit comprises a compressor (1), an outdoor heat exchanger (2) and a four-way valve (3), each inner unit comprises a bypass pipeline (4) and an indoor heat exchange pipeline (5), an indoor heat exchanger (6) and a throttle valve (7) are arranged on each indoor heat exchange pipeline (5), a first control valve (9) is arranged on each bypass pipeline (4), the indoor heat exchange pipelines (5) and an outdoor heat exchange pipeline (8) where the outdoor heat exchangers (2) are located are connected in series and then connected in parallel with the bypass pipelines (4) to form parallel pipelines, a first end of each parallel pipeline is connected to a first interface of the four-way valve (3), and a second end of each parallel pipeline is connected to a second interface of the four-way valve (3) through a first pipeline (11), and a second control valve (10) is arranged on the first pipeline (11), and the first pipeline (11) is connected with the internal unit in a one-to-one correspondence manner.
2. A defrosting method of a multi-split air conditioner as set forth in claim 1, comprising:
judging whether the defrosting condition is met;
when the defrosting condition is met, controlling the air conditioner to enter a defrosting mode;
acquiring idle internal machine information;
controlling the idle internal machine to operate;
the four-way valve (3) is controlled to change direction, and the control valve is adjusted, so that the working inner machine and the outer machine are jointly used as a condensation side, and the idle inner machine is used as an evaporation side.
3. The defrosting method according to claim 2, wherein the idle indoor units include an inactive indoor unit and an inactive indoor unit which is turned on in an unattended room.
4. The defrosting method according to claim 3, wherein the step of acquiring idle indoor unit information includes:
detecting whether an internal machine is started;
if the internal machine is not started, judging the internal machine to be an idle internal machine; or the like, or, alternatively,
detecting whether an internal machine is started;
if the indoor unit is started, detecting whether a person is in the indoor unit;
when no person is detected in the room, the indoor unit is judged to be an idle indoor unit.
5. A defrosting method according to claim 2 wherein the step of controlling the four-way valve (3) to reverse and adjust the control valve so that the working inner unit and the outer unit together serve as the condensing side and the idle inner unit serves as the evaporating side comprises:
closing a second control valve (10) of the working internal machine;
closing a first control valve (9) of the idle internal machine;
the refrigerant flows out of the compressor (1) and then is divided into two paths, one path flows into the working inner machine, the other path flows into the outdoor heat exchanger (2), the refrigerant flowing out of the working inner machine and the refrigerant flowing out of the outdoor heat exchanger (2) are converged and then enter the idle inner machine, and the refrigerant flows back to the compressor (1) after passing through the idle inner machine.
6. The defrosting method according to claim 2, wherein before controlling the reversing valve to reverse, the defrosting method further comprises:
acquiring operation parameters of an idle internal machine and a working internal machine;
and the opening of each internal machine throttle valve (7) and the working state of each control valve are adjusted according to the running parameters of the idle internal machine and the working internal machine, so that the running condition of the multi-split air conditioner meets the reversing requirement of the four-way valve (3).
7. The defrosting method according to claim 2, wherein the step of judging whether the defrosting condition is satisfied comprises:
acquiring the running time of an outdoor unit, the temperature of an outer ring and the pipe temperature of the outdoor heat exchanger (2);
and judging whether the defrosting condition is met according to the running time of the outdoor unit, the outer ring temperature and the pipe temperature of the outdoor heat exchanger (2).
8. The defrosting method according to claim 2, further comprising:
judging whether defrosting is clean;
when the defrosting is not clean, the defrosting step is continuously executed;
when the defrosting is clean, entering a defrosting ending stage.
9. The defrosting method according to claim 8, wherein the defrosting end stage comprises:
judging whether the multi-split air conditioner meets the reversing condition of the four-way valve (3);
when the reversing condition of the four-way valve (3) is met, the four-way valve (3) is controlled to reverse;
when the reversing condition of the four-way valve (3) is not met, the opening of each internal machine throttle valve (7) and the working state of each control valve are adjusted, so that the running condition of the multi-split air conditioner meets the reversing requirement of the four-way valve (3).
10. The defrosting method according to claim 9, wherein after the four-way valve (3) is reversed, the defrosting method further comprises:
controlling the information of the internal machine which is not started up in the normal heating state in the idle internal machine;
and controlling the internal machine which is not started up in the normal heating state to be shut down after preset time of heating operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010021957.XA CN111219803A (en) | 2020-01-09 | 2020-01-09 | Multi-split air conditioner and defrosting method thereof |
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| CN202010021957.XA CN111219803A (en) | 2020-01-09 | 2020-01-09 | Multi-split air conditioner and defrosting method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294890A (en) * | 2021-05-07 | 2021-08-24 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device for air conditioning unit and air conditioning unit |
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| CN113294890B (en) * | 2021-05-07 | 2022-07-08 | 宁波奥克斯电气股份有限公司 | Defrosting control method and device for air conditioning unit and air conditioning unit |
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