CN113108419A - Control method of multi-split air conditioning system - Google Patents
Control method of multi-split air conditioning system Download PDFInfo
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- CN113108419A CN113108419A CN202110275830.5A CN202110275830A CN113108419A CN 113108419 A CN113108419 A CN 113108419A CN 202110275830 A CN202110275830 A CN 202110275830A CN 113108419 A CN113108419 A CN 113108419A
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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
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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
- F24F11/70—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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
Abstract
The present disclosure provides a method for controlling a multi-split air conditioning system, including: a detection step, which is used for detecting the distance between at least two indoor units (6) connected with a main pipe and the outdoor unit (1); a judging step, which is used for judging the distance between at least two indoor units (6) connected with the main pipe and the outdoor unit (1); and a control step for controlling the indoor unit which is farthest away from the outdoor unit (1) in the plurality of indoor units (6) connected with the main pipe to return oil. According to the oil return mode of the farthest inner machine of the pipeline main line, the oil return of the inner machines of other pipelines is not executed, the compressor can be returned to oil of a pipeline system, enough lubricating oil work of the compressor is guaranteed, oil return noise is controlled in 1-2 indoor machines, noise influence caused by the oil return mode is reduced, and user experience is improved.
Description
Technical Field
The disclosure relates to the technical field of multi-split air conditioners, in particular to a control method of a multi-split air conditioner system.
Background
In the multi-split air conditioning system, lubricating oil is used for lubricating moving parts of the compressor due to the lubricating requirement of the compressor, so that friction is reduced, but in the working process of the compressor, part of the lubricating oil is inevitably brought out to enter a pipeline system, and the compressor runs for a long time and is lack of oil, so that the compressor is damaged. The multiple on-line system must take some way to return the lubricant to the compressor sump, otherwise the compressor is vulnerable.
The oil return technology of the existing multi-split air conditioning system is that an oil return mode is executed discontinuously (fixed oil return interval time), and the oil return mode is as follows: for the air pipe, generally increasing the running frequency of the compressor, the lubricating oil attached to the pipeline is flushed to the liquid return pipe by using a high-speed gaseous refrigerant; for the liquid pipe, all the throttle valves of the indoor units are opened (or fully opened), or the fans of the indoor units are lowered (or closed), so that the liquid refrigerant is brought back to the lubricating oil, and the oil on the system pipeline is cleaned once.
During oil return, the refrigerant flows at a high speed in the pipeline system, and the internal machine can generate certain refrigerant flowing noise to influence user experience.
The technical problems that a modularized full-function multi-split air conditioner in the prior art cannot solve the problem of system oil return, cannot reduce oil return noise of the multi-split air conditioner, cannot control noise within a minimum range and the like are solved, and therefore the control method of the multi-split air conditioner system is researched and designed.
BRIEF SUMMARY OF THE PRESENT DISCLOSURE
Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the multi-split air conditioning system in the prior art cannot ensure the oil return of the system and simultaneously reduce the oil return noise, thereby providing a control method of the multi-split air conditioning system.
In order to solve the above problems, the present disclosure provides a control method of a multi-split air conditioning system, in which:
the multi-split air conditioning system includes: the multi-split air conditioning system also comprises at least two main pipes; the multi-split air conditioning system also comprises at least two indoor units, and the at least two indoor units are communicated between the air pipe and the liquid pipe through the main pipe;
the control method comprises the following steps:
a detection step for detecting the distance between at least two indoor units connected with a main pipe and the outdoor unit;
a judging step, which is used for judging the distance between at least two indoor units connected with the main pipe and the outdoor unit;
and a control step for controlling the indoor unit which is farthest away from the outdoor unit among the plurality of indoor units connected with the main pipe to return oil.
In some embodiments, the detecting step is configured to detect a sum of accumulated operating times of at least two indoor units connected to each main duct;
the judging step is used for judging the sum of the accumulated running time of the indoor unit connected with each main pipe among the plurality of main pipes;
and the control step is used for controlling the largest sum of the accumulated running times of the indoor units connected with one of the trunk pipes as an oil return trunk pipe, and controlling the indoor unit which is the farthest indoor unit from the outdoor unit to return oil among the indoor units connected with the oil return trunk pipe.
In some embodiments, the trunk includes a first trunk and a second trunk,
the detecting step is used for detecting the sum Ta of the accumulated running time of at least two indoor units connected to the first main pipe and detecting the sum Tn of the accumulated running time of at least two indoor units connected to the second main pipe;
a judging step for judging the size between Ta and Tn;
controlling at least one indoor unit communicated with the first main pipe to return oil if Ta is larger than Tn; and if Ta is less than Tn, controlling at least one indoor unit communicated with the second main pipe to return oil.
In some embodiments, the indoor units in communication with the first trunk pipe include a first indoor unit, a second indoor unit, and a third indoor unit, the first trunk pipe includes a first branch pipe and a second branch pipe, one end of the first branch pipe is in communication with the air pipe, and one end of the second branch pipe is in communication with the liquid pipe;
one end of the first indoor unit, one end of the second indoor unit and one end of the third indoor unit are respectively communicated with the first branch pipe; the other end of the first indoor unit, the other end of the second indoor unit and the other end of the third indoor unit are respectively communicated with the second branch pipe;
the detection step is used for detecting the distances from the first indoor unit, the second indoor unit and the third indoor unit connected to the first main pipe to the outdoor unit respectively;
the judging step is used for judging the distance between the first indoor unit, the second indoor unit and the third indoor unit which are connected to the first main pipe and the distance between the first indoor unit, the second indoor unit and the third indoor unit and the outdoor unit respectively;
and in the control step, when Ta is larger than Tn and the distance from the third indoor unit to the outdoor unit is farthest, controlling the third indoor unit to return oil.
In some embodiments, the controlling step is that the means for controlling the third indoor unit to return oil is controlling the opening degree of a throttling device communicated with the third indoor unit to increase.
In some embodiments, the controlling step is further configured to control accumulated operating times of the indoor units communicated with the first main pipe to be all cleared after the third indoor unit is controlled to perform oil return.
In some embodiments, the indoor units in communication with the second trunk include a fourth indoor unit, a fifth indoor unit, and a sixth indoor unit, the second trunk includes a third branch and a fourth branch, one end of the third branch is in communication with the air pipe, and one end of the fourth branch is in communication with the liquid pipe;
one end of the fourth indoor unit, one end of the fifth indoor unit and one end of the sixth indoor unit are respectively communicated with the third branch pipe; the other end of the fourth indoor unit, the other end of the fifth indoor unit and the other end of the sixth indoor unit are respectively communicated with the fourth branch pipe;
the detection step is used for detecting the distances from the fourth indoor unit, the fifth indoor unit and the sixth indoor unit connected to the second main pipe to the outdoor unit respectively;
the judging step is used for judging the distance between the fourth indoor unit, the fifth indoor unit and the sixth indoor unit which are connected to the second main pipe and the outdoor unit respectively;
and in the control step, when Ta is less than Tn and the distance between the sixth indoor unit and the outdoor unit is farthest, controlling the sixth indoor unit to return oil.
In some embodiments, the controlling step controls the sixth indoor unit to return oil by controlling an opening degree of an expansion device communicating with the sixth indoor unit to be increased.
In some embodiments, the control step is configured to control accumulated operating times of the indoor units communicated with the second main pipe to be all cleared after the sixth indoor unit is controlled to return oil.
In some embodiments, the controlling step is further configured to control the indoor unit farthest from the outdoor unit to return oil, and at the same time, control other indoor units to close oil return.
In some embodiments, the controlling step is further configured to control the operating frequency of the outdoor unit to increase when the indoor unit is controlled to return oil.
The control method of the multi-split air conditioning system has the following beneficial effects:
1. according to the control method of the multi-split air conditioning system, the distance between the indoor unit and the outdoor unit in the pipeline system is detected, the indoor unit at the farthest position of the pipeline main pipe is controlled to execute oil return, and the pipeline branch indoor unit is free from oil return; according to the method, the far-near relation of the indoor unit on the pipeline relative to the outdoor unit is marked, or the far-near relation of the indoor unit on the pipeline relative to the outdoor unit is identified by using the communication system, the oil return mode is executed for the indoor unit which is farthest from the pipeline trunk line, oil return is not executed for other indoor units, so that oil in the pipeline system can return to the compressor, the compressor is guaranteed to have enough lubricating oil to work, oil return noise is controlled in 1-2 indoor units, noise influence caused by the oil return mode is reduced, and user experience is improved;
2. in addition, according to the air conditioner, the accumulated operation time of the indoor units connected to different trunk pipes is detected by comparing the trunk pipes, the indoor unit on the trunk pipe with the longest accumulated operation time is selected for oil return, the oil return amount and the oil return effect can be effectively improved, the longer the accumulated operation time of the indoor unit is, the longer the stay time of lubricating oil of the indoor unit is, the larger the oil return amount which can be recovered from a pipeline and the indoor unit is, and the oil return amount and the oil return effect can be effectively improved by the control mode.
Drawings
Fig. 1 is a system configuration diagram of a multi-split air conditioner of the present disclosure;
fig. 2 is a control flowchart of the multi-split air conditioner of the present disclosure.
The reference numerals are represented as:
1. an outdoor unit; 2. an air tube; 3. a liquid pipe; 4. a first main pipe; 41. a first branch pipe; 42. a second branch pipe; 5. a second main pipe; 51. a third branch pipe; 52. a fourth branch pipe; 6. an indoor unit; a1, a first indoor unit; a2, a second indoor unit; a3, a third indoor machine; n1, a fourth indoor unit; n2, a fifth indoor unit; n3, the sixth indoor unit.
Detailed Description
As shown in fig. 1 to 2, the present disclosure provides a control method of a multi-split air conditioning system, which includes:
the multi-split air conditioning system includes: the multi-split air conditioning system comprises an outdoor unit 1, an air pipe 2 and a liquid pipe 3, and further comprises at least two main pipes; the multi-split air conditioning system also comprises at least two indoor units 6, wherein the at least two indoor units 6 are communicated between the air pipe 2 and the liquid pipe 3 through the main pipe;
the control method comprises the following steps:
a detection step for detecting the distance between at least two indoor units 6 connected to a main pipe and the outdoor unit 1;
a judging step for judging the distance between at least two indoor units 6 connected with the main pipe and the outdoor unit 1;
and a control step of controlling the indoor unit which is the farthest indoor unit from the outdoor unit 1 among the plurality of indoor units 6 connected to the main pipe to return oil.
According to the control method of the multi-split air conditioning system, the distance between the indoor unit and the outdoor unit in the pipeline system is detected, the indoor unit at the farthest position of the pipeline main pipe is controlled to execute oil return, and the pipeline branch indoor unit is free from oil return; this is disclosed through the far and near relation of mark indoor set relative to outer machine on the pipeline, or uses communication system discernment indoor set relative to outer machine's far and near relation on the pipeline, carries out the oil return mode to the farthest indoor set of pipeline trunk line, and other way indoor sets do not carry out the oil return, and the oil that had both accomplished pipe-line system can get back to the compressor to guarantee that the compressor has sufficient lubricating oil work, also accomplish to control oil return noise in 1 ~ 2 indoor sets, reduces the noise influence that the oil return mode brought, improves user experience.
In some embodiments, the detecting step is used for detecting the sum of the accumulated running times of at least two indoor units 6 connected to each main pipe;
the judging step is used for judging the sum of the accumulated running time of the indoor unit 6 connected with each main pipe among a plurality of main pipes;
and the control step is used for controlling the largest sum of the accumulated running times of the indoor units 6 connected with one of the trunk pipes as an oil return trunk pipe, and controlling the indoor unit which is farthest away from the outdoor unit 1 in the indoor units 6 connected with the oil return trunk pipe to return oil.
According to the oil return control method and the oil return control device, the accumulated operation time of the indoor units connected to different trunk pipes is detected by comparing the trunk pipes, the indoor unit on the trunk pipe with the longest accumulated operation time is selected for oil return, the oil return amount and the oil return effect can be effectively improved, the longer the accumulated operation time of the indoor unit is, the longer the stay time of lubricating oil of the indoor unit is, the larger the oil return amount which can be recovered from a pipeline and the indoor unit is, and the oil return amount and the oil return effect can be effectively improved through the control mode.
In some embodiments, the main pipes include a first main pipe 4 and a second main pipe 5,
the detecting step is used for detecting the sum Ta of the accumulated running times of at least two indoor units 6 connected to the first main pipe 4 and detecting the sum Tn of the accumulated running times of at least two indoor units 6 connected to the second main pipe 5;
a judging step for judging the size between Ta and Tn;
controlling at least one indoor unit communicated with the first main pipe 4 to return oil if Ta is larger than Tn; and if Ta is less than Tn, controlling at least one indoor unit communicated with the second main pipe 5 to return oil.
The Ta & gt Tn indicates that the sum of the accumulated running time of the indoor units connected with the first main pipe is larger, so that the oil return amount of the indoor units on the first main pipe is larger by selecting the indoor units on the first main pipe, the oil return amount recovered from the pipelines and the indoor units is larger, and the oil return amount and the oil return effect are effectively improved; ta < Tn indicates that the sum of the accumulated running time of a plurality of indoor units connected with the second main pipe is larger, so that the oil return amount recovered from the pipeline and the indoor units by selecting the indoor units on the second main pipe is larger, and the oil return amount and the oil return effect are effectively improved.
In some embodiments, the indoor units communicating with the first trunk pipe 4 include a first indoor unit a1, a second indoor unit a2, and a third indoor unit a3, the first trunk pipe 4 includes a first branch pipe 41 and a second branch pipe 42, one end of the first branch pipe 41 communicates with the gas pipe 2, and one end of the second branch pipe 42 communicates with the liquid pipe 3;
one end of the first indoor unit a1, one end of the second indoor unit a2 and one end of the third indoor unit a3 are respectively communicated with the first branch pipe 41; the other end of the first indoor unit a1, the other end of the second indoor unit a2 and the other end of the third indoor unit a3 are respectively communicated with the second branch pipe 42;
the detecting step is configured to detect distances from the first indoor unit a1, the second indoor unit a2, and the third indoor unit a3 connected to the first main pipe 4 to the outdoor unit 1, respectively;
the determining step is configured to determine the distance between each of the first indoor unit a1, the second indoor unit a2, and the third indoor unit a3 connected to the first trunk pipe 4 and the outdoor unit 1;
and in the control step, when Ta is larger than Tn and the distance from the third indoor unit a3 to the outdoor unit 1 is farthest, controlling the third indoor unit a3 to return oil.
This is a further preferred form of the control method of the present disclosure, that is, the control mode when three indoor units are communicated with the first main pipe, and Ta > Tn, and the third indoor unit is farthest from the outdoor unit, that is, the oil return amount is effectively increased, the oil return effect is improved, and the oil return noise is reduced to the lowest by controlling the oil return of the third indoor unit a3, which is farthest from the outdoor unit, in the main pipe with the longest accumulated running time.
For example, the installation of the multi-split pipeline system is schematically shown in figure 1. Indoor set piping system installs like arborescent installation, and main pipeline is general 1, if the collocation indoor set is more, probably will have 2 or 3, and the main pipeline in the upper graph is 2: dry pipe a (i.e., first dry pipe 4), dry pipe n (second dry pipe 5). The above view is taken as an example and implemented as follows:
1. first, the inner machines on 2 dry pipes were labeled, respectively: a1, a2, a3, n1, n2, n3, wherein the inner lines a3 and n3 are farthest.
2. Marking the farthest indoor machine, when in engineering installation, directly setting by using a wire controller or detecting by communication, and recording all indoor machine branch trunk pipes and the farthest indoor machine by a communication system.
3. Secondly, the conventional oil return control mode of the external unit is to preset an oil return time interval T (for example, 12 hours) according to the operation frequency of the compressor and the operation time under the corresponding frequency.
4. And recording the oil return time of each internal machine from the previous time, and judging the sum Ta of the accumulated running time of each internal machine of the main pipe a and the sum Tn of the accumulated running time of each internal machine of the main pipe n.
5. If Ta > Tn, the oil return of the external unit is performed only for the third internal unit a3, and the other internal units are not performed. When the a3 is executed, the lubricating oil on the main pipe a and the third indoor unit a3 can be brought back to the outdoor unit, and the accumulated running time of the indoor units on the main pipe a is cleared after the execution.
In some embodiments, the controlling step is to control the oil return of the third indoor unit a3 to increase the opening degree of a throttling device communicated with the third indoor unit a 3.
6. Only the oil return is executed to the third indoor unit a3, that is, the operation frequency of the outdoor unit is increased, so that the refrigerant flow rate of the system is increased, and in addition, the electronic expansion valve of the third indoor unit a3 is controlled to be opened greatly, so that the refrigerant flow rate of the third indoor unit a3 is increased, evaporation cannot be performed, and the refrigerant flowing out of the indoor unit evaporator is in a liquid state. The liquid refrigerant can make the lubricating oil on the pipeline return to the compressor of the outer machine together. The same principle and manner is also the case where oil return is performed only for the sixth indoor unit n 3.
In some embodiments, the controlling step is further configured to control the accumulated operating times of the indoor units communicated with the first main pipe 4 to be all cleared after the third indoor unit a3 is controlled to perform oil return.
In some embodiments, the indoor units communicating with the second trunk pipe 5 comprise a fourth indoor unit n1, a fifth indoor unit n2 and a sixth indoor unit n3, the second trunk pipe 5 comprises a third branch pipe 51 and a fourth branch pipe 52, one end of the third branch pipe 51 communicates with the air pipe 2, and one end of the fourth branch pipe 52 communicates with the liquid pipe 3;
one end of the fourth indoor unit n1, one end of the fifth indoor unit n2 and one end of the sixth indoor unit n3 are respectively communicated with the third branch pipe 51; the other end of the fourth indoor unit n1, the other end of the fifth indoor unit n2 and the other end of the sixth indoor unit n3 are respectively communicated with the fourth branch pipe 52;
the detecting step is performed to detect distances from the fourth indoor unit n1, the fifth indoor unit n2, and the sixth indoor unit n3 connected to the second main duct 5 to the outdoor unit 1, respectively;
the determining step is configured to determine the distance between the fourth indoor unit n1, the fifth indoor unit n2, and the sixth indoor unit n3 connected to the second main pipe 5 and the outdoor unit 1, respectively;
and in the control step, when Ta is less than Tn and the distance between the sixth indoor unit n3 and the outdoor unit 1 is farthest, controlling the sixth indoor unit n3 to return oil.
This is a further preferable form of the control method of the present disclosure, that is, the control method when three indoor units are communicated with the second main pipe and Ta < Tn and the sixth indoor unit is farthest from the outdoor unit, that is, the oil return amount is effectively increased, the oil return effect is improved, and the oil return noise is reduced to the minimum by controlling the sixth indoor unit n3 farthest from the outdoor unit in the main pipe having the longest accumulated operation time at this time.
7. If Ta is less than or equal to Tn, the oil return of the outdoor unit is only carried out on the sixth indoor unit n3, other indoor units are not carried out, when the sixth indoor unit n3 is carried out, lubricating oil on the pipeline systems of the main pipe n and the sixth indoor unit n3 can be brought back to the outdoor unit, and the accumulated running time of each indoor unit on the main pipe n is reset after the execution.
The number of the main pipes can be 1 or n, and the number of the inner pipes on the main pipes is 1 or n, which is not specifically designated.
In some embodiments, the controlling step controls the sixth indoor unit n3 to return oil by controlling an opening degree of an expansion device communicating with the sixth indoor unit n3 to increase. This is a preferable control form for controlling the oil return in the sixth indoor unit that is farthest from the present disclosure, and the opening degree of the expansion device communicating with the sixth indoor unit is controlled to be increased, preferably to be the maximum, so that the refrigerant in the sixth indoor unit can be returned to the outdoor unit together with the oil to return the oil.
In some embodiments, the controlling step is configured to control the accumulated operating times of the indoor units communicating with the second main pipe 5 to be zero after controlling the sixth indoor unit n3 to return oil. And after oil return is carried out, the accumulated running time of the indoor units is controlled to be reset, namely, the next statistical period is entered, the running time of the indoor units is detected again, and oil return control of the next period is carried out.
In some embodiments, the controlling step is further configured to control the indoor unit farthest from the outdoor unit 1 among the plurality of indoor units to perform oil return, and also control other indoor units to close oil return. The optimal control mode for oil return of the sixth indoor unit with the farthest control distance is disclosed, the opening degree of the throttling device communicated with the sixth indoor unit is controlled to be increased, the throttling devices of other indoor units are closed or even closed, the refrigerant can be conveyed back to the outdoor unit together with oil from the sixth indoor unit, oil return is carried out, an oil return pipeline is effectively reduced, and oil return noise is reduced.
In some embodiments, the controlling step is further configured to control the operating frequency of the outdoor unit to increase when the indoor unit is controlled to return oil. According to the outdoor unit, the operation frequency of the outdoor unit is increased, the movement rate of a refrigerant can be effectively increased, the oil return speed is increased, the oil return is accelerated, and the oil return efficiency is improved.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, 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 disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.
Claims (11)
1. A control method of a multi-split air conditioning system is characterized in that:
the multi-split air conditioning system includes: the multi-split air conditioning system comprises an outdoor unit (1), an air pipe (2) and a liquid pipe (3), and further comprises at least two main pipes; the multi-split air conditioning system also comprises at least two indoor units (6), wherein the at least two indoor units (6) are communicated between the air pipe (2) and the liquid pipe (3) through the main pipe;
the control method comprises the following steps:
a detection step, which is used for detecting the distance between at least two indoor units (6) connected with a main pipe and the outdoor unit (1);
a judging step, which is used for judging the distance between at least two indoor units (6) connected with the main pipe and the outdoor unit (1);
and a control step for controlling the indoor unit which is farthest away from the outdoor unit (1) in the plurality of indoor units (6) connected with the main pipe to return oil.
2. The control method according to claim 1, characterized in that:
the detection step is used for detecting the sum of the accumulated running time of at least two indoor units (6) connected to each main pipe;
the judging step is used for judging the sum of the accumulated running time of the indoor unit (6) connected with each main pipe among the main pipes;
and the control step is used for controlling the largest sum of the accumulated running times of the indoor units (6) connected with one of the trunk pipes as an oil return trunk pipe among the trunk pipes, and controlling the indoor unit which is the farthest away from the outdoor unit (1) among the indoor units (6) connected with the oil return trunk pipe to return oil.
3. The control method according to claim 2, characterized in that:
the main pipes comprise a first main pipe (4) and a second main pipe (5),
the detection step is used for detecting the sum Ta of the accumulated running time of at least two indoor units (6) connected to the first main pipe (4) and detecting the sum Tn of the accumulated running time of at least two indoor units (6) connected to the second main pipe (5);
a judging step for judging the size between Ta and Tn;
controlling at least one indoor unit communicated with the first main pipe (4) to return oil if Ta is larger than Tn; and if Ta is less than Tn, controlling at least one indoor unit communicated with the second main pipe (5) to return oil.
4. The control method according to claim 3, characterized in that:
the indoor units communicated with the first trunk pipe (4) comprise a first indoor unit (a1), a second indoor unit (a2) and a third indoor unit (a3), the first trunk pipe (4) comprises a first branch pipe (41) and a second branch pipe (42), one end of the first branch pipe (41) is communicated with the air pipe (2), and one end of the second branch pipe (42) is communicated with the liquid pipe (3);
one end of the first indoor unit (a1), one end of the second indoor unit (a2) and one end of the third indoor unit (a3) are respectively communicated with the first branch pipe (41); the other end of the first indoor unit (a1), the other end of the second indoor unit (a2) and the other end of the third indoor unit (a3) are respectively communicated with the second branch pipe (42);
the detection step is used for detecting the distances from the first indoor unit (a1), the second indoor unit (a2) and the third indoor unit (a3) connected to the first main pipe (4) to the outdoor unit (1) respectively;
the judging step is used for judging the distance between the first indoor unit (a1), the second indoor unit (a2) and the third indoor unit (a3) connected to the first main pipe (4) and the distance between the first indoor unit (a1), the second indoor unit (a2) and the third indoor unit (a3) and the outdoor unit (1) respectively;
and in the control step, when Ta is larger than Tn and the distance between the third indoor unit (a3) and the outdoor unit (1) is farthest, controlling the third indoor unit (a3) to return oil.
5. The control method according to claim 4, characterized in that:
the step of controlling the oil return of the third indoor unit (a3) is to control the opening degree of a throttling device communicated with the third indoor unit (a3) to increase.
6. The control method according to claim 4, characterized in that:
and the control step is also used for controlling the accumulated running time of the indoor units communicated with the first main pipe (4) to be zero cleared after the third indoor unit (a3) is controlled to return oil.
7. The control method according to claim 3, characterized in that:
the indoor units communicated with the second trunk pipe (5) comprise a fourth indoor unit (n1), a fifth indoor unit (n2) and a sixth indoor unit (n3), the second trunk pipe (5) comprises a third branch pipe (51) and a fourth branch pipe (52), one end of the third branch pipe (51) is communicated with the air pipe (2), and one end of the fourth branch pipe (52) is communicated with the liquid pipe (3);
one end of the fourth indoor unit (n1), one end of the fifth indoor unit (n2) and one end of the sixth indoor unit (n3) are respectively communicated with the third branch pipe (51); the other end of the fourth indoor unit (n1), the other end of the fifth indoor unit (n2) and the other end of the sixth indoor unit (n3) are respectively communicated with the fourth branch pipe (52);
the detecting step is used for detecting the distances from the fourth indoor unit (n1), the fifth indoor unit (n2) and the sixth indoor unit (n3) connected to the second main pipe (5) to the outdoor unit (1);
the judging step is used for judging the distance between the fourth indoor unit (n1), the fifth indoor unit (n2) and the sixth indoor unit (n3) connected to the second main pipe (5) and the outdoor unit (1);
and the control step is that when Ta < Tn and the distance between the sixth indoor unit (n3) and the outdoor unit (1) is farthest, the sixth indoor unit (n3) is controlled to return oil.
8. The control method according to claim 7, characterized in that:
and a control step of controlling the sixth indoor unit (n3) to return oil by controlling an opening degree of an expansion device communicating with the sixth indoor unit (n3) to increase.
9. The control method according to claim 7, characterized in that:
and the control step is used for controlling the accumulated running time of the indoor units communicated with the second main pipe (5) to be zero after the sixth indoor unit (n3) is controlled to return oil.
10. The control method according to any one of claims 1 to 9, characterized in that:
and the control step is also used for controlling the indoor unit which is farthest away from the outdoor unit (1) in the plurality of indoor units to return oil, and simultaneously controlling other indoor units to close oil return.
11. The control method according to any one of claims 1 to 9, characterized in that:
and the control step is also used for controlling the running frequency of the outdoor unit to increase when the indoor unit is controlled to return oil.
Priority Applications (1)
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| CN202110275830.5A CN113108419B (en) | 2021-03-15 | 2021-03-15 | Control method of multi-split air conditioning system |
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