CN116007135B - Control method and system for refrigerating oil return of air conditioning system - Google Patents
Control method and system for refrigerating oil return of air conditioning system Download PDFInfo
- Publication number
- CN116007135B CN116007135B CN202211520103.1A CN202211520103A CN116007135B CN 116007135 B CN116007135 B CN 116007135B CN 202211520103 A CN202211520103 A CN 202211520103A CN 116007135 B CN116007135 B CN 116007135B
- Authority
- CN
- China
- Prior art keywords
- oil return
- compressor
- indoor unit
- frequency
- running
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004378 air conditioning Methods 0.000 title claims abstract description 36
- 230000004044 response Effects 0.000 claims abstract description 8
- 239000003921 oil Substances 0.000 claims description 248
- 239000010725 compressor oil Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a control method and a system for refrigerating and oil returning of an air conditioning system, which are based on the air conditioning system, wherein the method comprises the following steps: acquiring the running frequency of the compressor of the outdoor unit and the accumulated running time of the running frequency; oil return judgment is carried out according to the acquired operation frequency, and an oil return period corresponding to the frequency is obtained; responding to the accumulated running time to meet the oil return period corresponding to the frequency, and controlling the compressor of the outdoor unit, the started indoor unit and the part of the indoor units which are not started to enter oil return operation; the method comprises the steps that an unoperated part of indoor units entering oil return operation are determined through an unoperated state flag bit and operation frequency; and controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return in response to the end of the oil return running. The invention can ensure the oil return reliability of the system, reduce the oil return frequency, reduce the energy consumption loss, and simultaneously avoid the noise and the energy loss generated by starting the internal machine which is stopped during oil return.
Description
Technical Field
The invention relates to a control method and a control system for refrigerating and oil returning of an air conditioning system, and belongs to the technical field of wind power generation control.
Background
The multi-split air conditioner has the characteristics of long pipelines and more indoor units, and in use, compressor lubricating oil is inevitably attached to a system pipeline or an indoor unit heat exchanger along with the flowing of a refrigerant. After the air conditioning system runs for a long time, the discharged lubricating oil is more and more, and oil return is needed.
In general, the oil return is that the air conditioning system is operated for a certain fixed time, the rotation speed of the compressor is forcedly increased to a fixed frequency, and meanwhile, valves of all indoor units are forcedly opened, so that the flow speed of the refrigerant is increased, and the lubricating oil accumulated outside is brought back to the compressor.
In the prior art, whether oil is returned or not and the number of the internal machines needing oil return are determined according to the running time and the running capacity of the indoor machines, so that oil return energy conservation is realized. When the oil return operation is carried out, the air conditioner consumes additional power, and the forced opening of the valves of all the indoor units can cause noise to be generated by the indoor units in a shutdown state and simultaneously cause energy loss.
In the prior art, oil return is classified according to the running state of the indoor unit, the running indoor unit returns normally, and the stopped indoor unit divides the opening of the electronic expansion valve of the indoor unit according to whether a person exists in a room or not during oil return, so that noise during oil return is reduced as much as possible. The higher the frequency of the oil return operation, the worse the energy saving performance of the air conditioner.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a control method and a control system for refrigerating and oil returning of an air conditioning system. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
In a first aspect, the present invention provides a control method for refrigerating and returning oil of an air conditioning system, based on the air conditioning system, the method includes:
Acquiring the running frequency of the compressor of the outdoor unit and the accumulated running time of the running frequency;
Oil return judgment is carried out according to the acquired operation frequency, and an oil return period corresponding to the frequency is obtained;
Responding to the accumulated running time to meet the oil return period corresponding to the frequency, and controlling the compressor of the outdoor unit, the started indoor unit and the part of the indoor units which are not started to enter oil return operation; the method comprises the steps that an unoperated part of indoor units entering oil return operation are determined through an unoperated state flag bit and operation frequency;
And controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return in response to the end of the oil return running.
With reference to the first aspect, further, the determining the oil return according to the obtained operation frequency includes:
When the running frequency P of the compressor of the outdoor unit meets the condition that A is more than P and less than or equal to B, the oil return period is T1;
when the running frequency P of the compressor of the outdoor unit meets B < P is less than or equal to C, the oil return period is T2;
when the running frequency P of the compressor of the outdoor unit meets C < P is less than or equal to D, the oil return period is T3;
When the running frequency P of the compressor of the outdoor unit meets P & gtD, the oil return period is ≡, which means that the air conditioning system does not need to enter oil return operation;
Wherein P is the obtained operating frequency of the outdoor unit compressor; A. b, C and D are different frequency classes, and A < B < C < D; t1 is less than T2 and less than T3.
With reference to the first aspect, further, controlling the outdoor compressor to enter into the oil return operation includes:
the outdoor unit compressor frequency is raised to a preset frequency P1.
With reference to the first aspect, further, controlling the started indoor unit to enter into an oil return operation includes:
The rotating speed of the started indoor unit fan is kept unchanged, and the electronic expansion valve acts as follows:
When the proportion k of the number of the running indoor units to the number of all the indoor units is less than 30%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is 400 x (1-k) larger than the current opening;
when the ratio of the number of the running indoor units to the number of all the indoor units is 30 percent or more and less than 50 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is 300 x (1-k) larger than the current opening;
When the ratio of the number of the running indoor units to the number of all the indoor units is 50 percent or more and less than 80 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is increased by 200 x (1-k) on the basis of the current opening;
When the ratio k of the number of the running indoor units to the number of all the indoor units is more than or equal to 80%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is increased by 150 x (1-k) on the basis of the current opening.
With reference to the first aspect, further, the non-oil return status flag bit is: each time the air conditioning system enters oil return operation, a flag bit tn of an oil return state, which is given to an indoor unit which is not started, is the times when the air conditioning system enters oil return operation and the indoor unit is in the starting state; when the indoor unit marked with the non-oil return state flag bit enters oil return operation, the non-oil return state flag bit of the indoor unit is cleared.
With reference to the first aspect, further, the determining, by the un-oil-return status flag bit and the operating frequency, of the un-started indoor unit entering the oil-return operation includes:
When the running frequency of the compressor of the outdoor unit meets the requirement that A is more than P and less than or equal to B, if the flag bit of the non-oil return state of the indoor unit which is not started reaches t3, the indoor unit enters into oil return running;
When the running frequency of the compressor of the outdoor unit meets B < P less than or equal to C, if the non-oil return state flag bit of the indoor unit which is not started reaches t5, the indoor unit enters into oil return running;
When the running frequency of the compressor of the outdoor unit meets C < P less than or equal to D, if the flag bit of the non-oil return state of the indoor unit which is not started reaches t7, the indoor unit enters into oil return running.
With reference to the first aspect, further, controlling the inactive indoor unit to enter into the oil return operation includes:
And the fan of the indoor unit is kept closed, and the electronic expansion valve is opened to 50 steps.
With reference to the first aspect, further, controlling the outdoor compressor to recover the operating state before oil return includes:
The running frequency of the compressor of the outdoor unit before oil return is recovered, the oil return period of the compressor of the outdoor unit is cleared, and the accumulated running time is recalculated.
With reference to the first aspect, further, controlling the indoor unit to recover the operating state before oil return includes:
The fan of the indoor unit is started to recover the rotating speed before oil return, and the opening of the electronic expansion valve recovers the opening before oil return;
and the fans of the indoor units which are not started are kept closed, and the opening of the electronic expansion valve is recovered to the opening before oil return.
In a second aspect, the present invention provides a control system for refrigerating and returning oil of an air conditioning system, connected to the air conditioning system, including:
the acquisition module is used for: the method comprises the steps of acquiring the running frequency of an outdoor unit compressor and the accumulated running time of the running frequency;
The oil return judging module: the method is used for carrying out oil return judgment according to the acquired operation frequency to obtain an oil return period corresponding to the frequency;
The oil return operation module: the system comprises an outdoor unit compressor, an indoor unit and an indoor unit, wherein the outdoor unit compressor, the indoor unit and the indoor unit are started and the indoor unit is started; the method comprises the steps that an unoperated part of indoor units entering oil return operation are determined through an unoperated state flag bit and operation frequency;
and an oil return end module: and the control unit is used for controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return in response to the end of the oil return running.
Compared with the prior art, the control method and the control system for the refrigerating and oil returning of the air conditioning system provided by the embodiment of the invention have the beneficial effects that:
the method comprises the steps of obtaining the running frequency of the compressor of the outdoor unit and the accumulated running time of the running frequency; oil return judgment is carried out according to the acquired operation frequency, and an oil return period corresponding to the frequency is obtained; according to the invention, the oil return period is divided according to the running state of the compressor, and different oil return periods are formulated;
In the invention, the compressor of the outdoor unit, the started indoor unit and the part of the indoor units which are not started are controlled to enter the oil return operation in response to the accumulated operation time meeting the oil return period corresponding to the frequency; according to the invention, the partition control is carried out according to the starting state of the indoor unit, the started indoor unit enters the oil return operation, and the valve opening degree during oil return is adjusted according to the quantity proportion of the operation, so that the reliability of oil return is ensured;
The non-started part of indoor units entering oil return operation is determined through the non-oil return state zone bit and the operation frequency; according to the method, the non-oil return zone bit control is carried out on the non-started indoor unit, the non-oil return zone bit value is accumulated according to the oil return period, the non-started indoor unit is determined to enter oil return operation according to different oil return periods, the oil return reliability can be ensured, the oil return frequency of the stopped indoor unit can be effectively reduced, and noise and energy consumption are reduced.
In the invention, the compressor of the outdoor unit and the indoor unit are controlled to recover the running state before oil return in response to the end of oil return running;
The invention performs partition control on the started indoor units and the non-started indoor units, performs oil return control on the started indoor units, and performs non-oil return state flag bit control on the non-started indoor units, thereby not only ensuring the oil return reliability of the system, but also reducing the oil return frequency, reducing the energy consumption loss, and simultaneously avoiding the noise and the energy loss generated by starting the stopped indoor units during oil return.
Drawings
Fig. 1 is a flowchart of a control method for refrigerating and returning oil of an air conditioning system provided in embodiment 1 of the present invention;
fig. 2 is a flowchart of the operation of the indoor unit started during the oil return operation in the method for controlling the refrigeration oil return of the air conditioning system according to embodiment 1 of the present invention;
fig. 3 is a flowchart illustrating the operation of an indoor unit that is not started during the oil return operation in the method for controlling the refrigerating oil return of an air conditioning system according to embodiment 1 of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
Example 1:
A control method for refrigerating and oil returning of an air conditioning system is based on the air conditioning system and comprises the following steps: and (5) oil return judgment, oil return operation and oil return ending.
As shown in fig. 1, the method specifically includes:
The operating frequency of the outdoor unit compressor and the accumulated operating time of the operating frequency are acquired. And carrying out oil return judgment according to the acquired operating frequency to obtain an oil return period corresponding to the frequency.
When the running frequency P of the compressor of the outdoor unit meets the condition that A is more than P and less than or equal to B, the oil return period is T1;
when the running frequency P of the compressor of the outdoor unit meets B < P is less than or equal to C, the oil return period is T2;
when the running frequency P of the compressor of the outdoor unit meets C < P is less than or equal to D, the oil return period is T3;
When the running frequency P of the compressor of the outdoor unit meets P & gtD, the oil return period is ≡, which means that the air conditioning system does not need to enter oil return operation;
Wherein P is the obtained operating frequency of the outdoor unit compressor; A. b, C and D are different frequency classes, and A < B < C < D; t1 is less than T2 and less than T3.
In this example, A is 15rps, B is 40rps, C is 60rps, and D is 80rps.
In this example, T1 is 1-2h, T2 is 3-4h, T3 is 5-6h.
When the outdoor unit compressor is operated in a certain frequency range, the accumulated operation time is recorded, and when the accumulated operation time meets a certain period, the outdoor unit compressor, the started indoor units and the part of the indoor units which are not started enter oil return operation.
The method for controlling the compressor of the outdoor unit to enter the oil return operation comprises the following steps: the outdoor unit compressor frequency is raised to a preset frequency P1.
As shown in fig. 2, controlling the indoor unit started to enter into an oil return operation includes: the rotating speed of the started indoor unit fan is kept unchanged, and the electronic expansion valve acts as follows:
When the proportion k of the number of the running indoor units to the number of all the indoor units is less than 30%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is 400 x (1-k) larger than the current opening;
when the ratio of the number of the running indoor units to the number of all the indoor units is 30 percent or more and less than 50 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is 300 x (1-k) larger than the current opening;
When the ratio of the number of the running indoor units to the number of all the indoor units is 50 percent or more and less than 80 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is increased by 200 x (1-k) on the basis of the current opening;
When the ratio k of the number of the running indoor units to the number of all the indoor units is more than or equal to 80%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is increased by 150 x (1-k) on the basis of the current opening.
Responding to the accumulated running time to meet the oil return period corresponding to the frequency, and controlling the compressor of the outdoor unit, the started indoor unit and the part of the indoor units which are not started to enter oil return operation; the method comprises the steps that an unoperated part of indoor units entering oil return operation are determined through an unoperated state flag bit and operation frequency;
And controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return in response to the end of the oil return running.
The fan of the indoor unit which is not started is kept to stop, the electronic expansion valve is kept to be closed and does not enter oil return operation, and meanwhile, a flag bit t1 in an oil return state is given to the fan.
As shown in fig. 3, after the oil return control operation is completed, the system resumes normal operation again, the compressor oil return period of the outdoor unit is cleared, the compressor operation time is accumulated again, the oil return program control is repeatedly entered, meanwhile, when the oil return control is entered each time, the non-oil return state flag bits of the stopped indoor unit are accumulated as t2 and t3 … …, the air conditioning system enters the oil return operation each time, the non-oil return state flag bits tn given to the non-started indoor unit are the times when the air conditioning system enters the oil return operation and the indoor unit is in the non-starting state.
For example, the air conditioning system enters into two oil return program control, but the indoor unit is in a stop state twice, and then the flag bit t2 of the non-oil return state is given.
When the indoor unit marked with the non-oil return state flag bit enters oil return operation, the non-oil return state flag bit of the indoor unit is cleared.
The un-started part of indoor units entering the oil return operation are determined through the un-oil return state zone bit and the operation frequency, and the method comprises the following steps:
When the running frequency of the compressor of the outdoor unit meets the requirement that A is more than P and less than or equal to B, if the flag bit of the non-oil return state of the indoor unit which is not started reaches t3, the indoor unit enters into oil return running;
When the running frequency of the compressor of the outdoor unit meets B < P less than or equal to C, if the non-oil return state flag bit of the indoor unit which is not started reaches t5, the indoor unit enters into oil return running;
When the running frequency of the compressor of the outdoor unit meets C < P less than or equal to D, if the flag bit of the non-oil return state of the indoor unit which is not started reaches t7, the indoor unit enters into oil return running.
As shown in fig. 3, controlling the indoor unit that is not started to enter the oil return operation includes: and the fan of the indoor unit is kept closed, and the electronic expansion valve is opened to 50 steps.
And after the oil return operation is finished, controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return.
The method for controlling the compressor of the outdoor unit to recover the running state before oil return comprises the following steps: the running frequency of the compressor of the outdoor unit before oil return is recovered, the oil return period of the compressor of the outdoor unit is cleared, and the accumulated running time is recalculated.
The control of the indoor unit to recover the running state before oil return comprises: the fan of the indoor unit is started to recover the rotating speed before oil return, and the opening of the electronic expansion valve recovers the opening before oil return; and the fans of the indoor units which are not started are kept closed, and the opening of the electronic expansion valve is recovered to the opening before oil return.
According to the invention, the oil return period is divided according to the running state of the compressor, different oil return periods are formulated, meanwhile, the partition control is carried out on the started indoor unit and the non-started indoor unit, the oil return control is carried out on the started indoor unit, the non-oil return state zone bit control is carried out on the non-started indoor unit, the oil return reliability of the system is ensured, the oil return frequency is reduced, the energy consumption loss is reduced, and the noise and the energy loss generated by starting the stopped indoor unit during oil return are avoided.
Example 2:
The embodiment of the invention provides a control system for refrigerating and oil returning of an air conditioning system, which is connected with the air conditioning system and comprises:
the acquisition module is used for: the method comprises the steps of acquiring the running frequency of an outdoor unit compressor and the accumulated running time of the running frequency;
The oil return judging module: the method is used for carrying out oil return judgment according to the acquired operation frequency to obtain an oil return period corresponding to the frequency;
The oil return operation module: the system comprises an outdoor unit compressor, an indoor unit and an indoor unit, wherein the outdoor unit compressor, the indoor unit and the indoor unit are started and the indoor unit is started; the method comprises the steps that an unoperated part of indoor units entering oil return operation are determined through an unoperated state flag bit and operation frequency;
and an oil return end module: and the control unit is used for controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return in response to the end of the oil return running.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (2)
1. A control method for refrigerating and oil returning of an air conditioning system, which is characterized by comprising the following steps of:
Acquiring the running frequency of the compressor of the outdoor unit and the accumulated running time of the running frequency;
oil return judgment is carried out according to the acquired operation frequency, and an oil return period corresponding to the frequency is obtained; the oil return judgment according to the acquired operation frequency comprises the following steps:
When the running frequency P of the compressor of the outdoor unit meets the condition that A is more than P and less than or equal to B, the oil return period is T1;
when the running frequency P of the compressor of the outdoor unit meets B < P is less than or equal to C, the oil return period is T2;
when the running frequency P of the compressor of the outdoor unit meets C < P is less than or equal to D, the oil return period is T3;
When the running frequency P of the compressor of the outdoor unit meets P & gtD, the oil return period is ≡, which means that the air conditioning system does not need to enter oil return operation;
Wherein P is the obtained operating frequency of the outdoor unit compressor; A. b, C and D are different frequency classes, and A < B < C < D; t1 is more than T2 and less than T3;
responding to the accumulated running time to meet the oil return period corresponding to the frequency, and controlling the compressor of the outdoor unit, the started indoor unit and the part of the indoor units which are not started to enter oil return operation;
wherein, control the off-premises station compressor to get into the oil return operation, include: the frequency of the compressor of the outdoor unit is increased to a preset frequency P1;
The method for controlling the started indoor unit to enter the oil return operation comprises the following steps: the rotating speed of the started indoor unit fan is kept unchanged, and the electronic expansion valve acts as follows: when the proportion k of the number of the running indoor units to the number of all the indoor units is less than 30%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is 400 x (1-k) larger than the current opening; when the ratio of the number of the running indoor units to the number of all the indoor units is 30 percent or more and less than 50 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is 300 x (1-k) larger than the current opening; when the ratio of the number of the running indoor units to the number of all the indoor units is 50 percent or more and less than 80 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is increased by 200 x (1-k) on the basis of the current opening; when the ratio k of the number of the running indoor units to the number of all the indoor units is more than or equal to 80%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is 150 x (1-k) larger than the current opening;
Wherein, control the indoor set that does not start to get into the oil return operation, include: the fan of the indoor unit is kept closed, and the electronic expansion valve is opened to 50 steps;
the method comprises the steps that an unoperated part of indoor units entering oil return operation are determined through an unoperated state flag bit and operation frequency;
The method for determining the non-started part of indoor units entering the oil return operation through the non-oil return state zone bit and the operation frequency comprises the following steps:
When the running frequency of the compressor of the outdoor unit meets the requirement that A is more than P and less than or equal to B, if the flag bit of the non-oil return state of the indoor unit which is not started reaches t3, the indoor unit enters into oil return running;
When the running frequency of the compressor of the outdoor unit meets B < P less than or equal to C, if the non-oil return state flag bit of the indoor unit which is not started reaches t5, the indoor unit enters into oil return running;
when the running frequency of the compressor of the outdoor unit meets C < P less than or equal to D, if the non-oil return state flag bit of the indoor unit which is not started reaches t7, the indoor unit enters into oil return running;
wherein P is the obtained operating frequency of the outdoor unit compressor; A. b, C and D are different frequency classes, and A < B < C < D;
The non-oil return state flag bit is: each time the air conditioning system enters oil return operation, a flag bit tn of an oil return state, which is given to an indoor unit which is not started, is the times when the air conditioning system enters oil return operation and the indoor unit is in the starting state; the fan of the indoor unit which is not started is kept to stop, the electronic expansion valve is kept to be closed and does not enter oil return operation, and meanwhile, a flag bit t1 in an oil return state is given to the fan; after the oil return control operation is finished, the system resumes normal operation again, the compressor oil return period of the outdoor unit is cleared, the compressor operation time is accumulated again, the oil return program control is repeatedly carried out, and meanwhile, when the oil return control is carried out each time, the flag bits of the stopped indoor unit in the state of not returning oil are accumulated as t2 and t3 … … tn; when the indoor unit marked with the non-oil return state flag bit enters oil return operation, the non-oil return state flag bit of the indoor unit is cleared;
Responding to the end of the oil return operation, and controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return;
wherein, the operation state before the control off-premises station compressor resumes the oil return includes: the running frequency of the compressor of the outdoor unit before oil return is recovered, the oil return period of the compressor of the outdoor unit is cleared, and the accumulated running time is recalculated;
Wherein, the operation state before the control indoor set resumes the oil return includes: the fan of the indoor unit is started to recover the rotating speed before oil return, and the opening of the electronic expansion valve recovers the opening before oil return; and the fans of the indoor units which are not started are kept closed, and the opening of the electronic expansion valve is recovered to the opening before oil return.
2. A control system for refrigerating and returning oil of an air conditioning system, which is connected with the air conditioning system, comprising:
the acquisition module is used for: the method comprises the steps of acquiring the running frequency of an outdoor unit compressor and the accumulated running time of the running frequency;
The oil return judging module: the method is used for carrying out oil return judgment according to the acquired operation frequency to obtain an oil return period corresponding to the frequency; the oil return judgment according to the acquired operation frequency comprises the following steps:
When the running frequency P of the compressor of the outdoor unit meets the condition that A is more than P and less than or equal to B, the oil return period is T1;
when the running frequency P of the compressor of the outdoor unit meets B < P is less than or equal to C, the oil return period is T2;
when the running frequency P of the compressor of the outdoor unit meets C < P is less than or equal to D, the oil return period is T3;
When the running frequency P of the compressor of the outdoor unit meets P & gtD, the oil return period is ≡, which means that the air conditioning system does not need to enter oil return operation;
Wherein P is the obtained operating frequency of the outdoor unit compressor; A. b, C and D are different frequency classes, and A < B < C < D; t1 is more than T2 and less than T3;
The oil return operation module: the system comprises an outdoor unit compressor, an indoor unit and an indoor unit, wherein the outdoor unit compressor, the indoor unit and the indoor unit are started and the indoor unit is started; wherein, control the off-premises station compressor to get into the oil return operation, include: the frequency of the compressor of the outdoor unit is increased to a preset frequency P1;
The method for controlling the started indoor unit to enter the oil return operation comprises the following steps: the rotating speed of the started indoor unit fan is kept unchanged, and the electronic expansion valve acts as follows: when the proportion k of the number of the running indoor units to the number of all the indoor units is less than 30%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is 400 x (1-k) larger than the current opening; when the ratio of the number of the running indoor units to the number of all the indoor units is 30 percent or more and less than 50 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is 300 x (1-k) larger than the current opening; when the ratio of the number of the running indoor units to the number of all the indoor units is 50 percent or more and less than 80 percent, the opening of the electronic expansion valve of the indoor unit is adjusted, and the opening is increased by 200 x (1-k) on the basis of the current opening; when the ratio k of the number of the running indoor units to the number of all the indoor units is more than or equal to 80%, the opening of the electronic expansion valve of the started indoor unit is adjusted, and the opening is 150 x (1-k) larger than the current opening;
Wherein, control the indoor set that does not start to get into the oil return operation, include: the fan of the indoor unit is kept closed, and the electronic expansion valve is opened to 50 steps;
the method comprises the steps that an unoperated part of indoor units entering oil return operation are determined through an unoperated state flag bit and operation frequency;
The method for determining the non-started part of indoor units entering the oil return operation through the non-oil return state zone bit and the operation frequency comprises the following steps:
When the running frequency of the compressor of the outdoor unit meets the requirement that A is more than P and less than or equal to B, if the flag bit of the non-oil return state of the indoor unit which is not started reaches t3, the indoor unit enters into oil return running;
When the running frequency of the compressor of the outdoor unit meets B < P less than or equal to C, if the non-oil return state flag bit of the indoor unit which is not started reaches t5, the indoor unit enters into oil return running;
when the running frequency of the compressor of the outdoor unit meets C < P less than or equal to D, if the non-oil return state flag bit of the indoor unit which is not started reaches t7, the indoor unit enters into oil return running;
wherein P is the obtained operating frequency of the outdoor unit compressor; A. b, C and D are different frequency classes, and A < B < C < D;
The non-oil return state flag bit is: each time the air conditioning system enters oil return operation, a flag bit tn of an oil return state, which is given to an indoor unit which is not started, is the times when the air conditioning system enters oil return operation and the indoor unit is in the starting state; the fan of the indoor unit which is not started is kept to stop, the electronic expansion valve is kept to be closed and does not enter oil return operation, and meanwhile, a flag bit t1 in an oil return state is given to the fan; after the oil return control operation is finished, the system resumes normal operation again, the compressor oil return period of the outdoor unit is cleared, the compressor operation time is accumulated again, the oil return program control is repeatedly carried out, and meanwhile, when the oil return control is carried out each time, the flag bits of the stopped indoor unit in the state of not returning oil are accumulated as t2 and t3 … … tn; when the indoor unit marked with the non-oil return state flag bit enters oil return operation, the non-oil return state flag bit of the indoor unit is cleared;
And an oil return end module: the control unit is used for controlling the compressor of the outdoor unit and the indoor unit to recover the running state before oil return in response to the end of the oil return running;
wherein, the operation state before the control off-premises station compressor resumes the oil return includes: the running frequency of the compressor of the outdoor unit before oil return is recovered, the oil return period of the compressor of the outdoor unit is cleared, and the accumulated running time is recalculated;
Wherein, the operation state before the control indoor set resumes the oil return includes: the fan of the indoor unit is started to recover the rotating speed before oil return, and the opening of the electronic expansion valve recovers the opening before oil return; and the fans of the indoor units which are not started are kept closed, and the opening of the electronic expansion valve is recovered to the opening before oil return.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211520103.1A CN116007135B (en) | 2022-11-30 | 2022-11-30 | Control method and system for refrigerating oil return of air conditioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211520103.1A CN116007135B (en) | 2022-11-30 | 2022-11-30 | Control method and system for refrigerating oil return of air conditioning system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116007135A CN116007135A (en) | 2023-04-25 |
| CN116007135B true CN116007135B (en) | 2024-05-28 |
Family
ID=86023728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211520103.1A Active CN116007135B (en) | 2022-11-30 | 2022-11-30 | Control method and system for refrigerating oil return of air conditioning system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116007135B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012198020A (en) * | 2012-06-21 | 2012-10-18 | Mitsubishi Heavy Ind Ltd | Air conditioning system and oil return control method of the same |
| CN109631248A (en) * | 2018-11-16 | 2019-04-16 | 青岛海尔空调电子有限公司 | A kind of multi-joint mechanism cold oil return method for noise reduction control and system |
| CN110857809A (en) * | 2018-08-24 | 2020-03-03 | 青岛海尔空调器有限总公司 | Air conditioner and oil return control method thereof |
| CN111059655A (en) * | 2019-11-22 | 2020-04-24 | 广州万居隆电器有限公司 | Air conditioning device and control method thereof |
| CN111426011A (en) * | 2020-04-13 | 2020-07-17 | 广东美的暖通设备有限公司 | Control method of air conditioning system, air conditioning system and computer storage medium |
| CN114353250A (en) * | 2022-01-07 | 2022-04-15 | 青岛海尔空调电子有限公司 | Control method and device for oil return of multi-split air conditioner and air conditioner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109084499A (en) * | 2018-08-15 | 2018-12-25 | 广东美的暖通设备有限公司 | Air conditioner oil return control method, air-conditioning and computer readable storage medium |
-
2022
- 2022-11-30 CN CN202211520103.1A patent/CN116007135B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012198020A (en) * | 2012-06-21 | 2012-10-18 | Mitsubishi Heavy Ind Ltd | Air conditioning system and oil return control method of the same |
| CN110857809A (en) * | 2018-08-24 | 2020-03-03 | 青岛海尔空调器有限总公司 | Air conditioner and oil return control method thereof |
| CN109631248A (en) * | 2018-11-16 | 2019-04-16 | 青岛海尔空调电子有限公司 | A kind of multi-joint mechanism cold oil return method for noise reduction control and system |
| CN111059655A (en) * | 2019-11-22 | 2020-04-24 | 广州万居隆电器有限公司 | Air conditioning device and control method thereof |
| CN111426011A (en) * | 2020-04-13 | 2020-07-17 | 广东美的暖通设备有限公司 | Control method of air conditioning system, air conditioning system and computer storage medium |
| CN114353250A (en) * | 2022-01-07 | 2022-04-15 | 青岛海尔空调电子有限公司 | Control method and device for oil return of multi-split air conditioner and air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116007135A (en) | 2023-04-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20220011032A1 (en) | Control method and system for refrigeration, oil return and noise reduction of multi-split air-conditioner | |
| CN110779183B (en) | Operation control method and device, air conditioner and storage medium | |
| CN112361537B (en) | Multi-split air conditioning system and oil return control method and device thereof, storage medium and processor | |
| CN108870807B (en) | Oil return control method and device for multi-split air conditioning system and computer storage medium | |
| CN113790542B (en) | Multi-module water chilling unit and scheduling control method thereof | |
| CN106123417A (en) | The control method that a kind of compressor of air conditioner starts and control device | |
| CN111207502B (en) | Operation control method, operation control device, air conditioning system, and storage medium | |
| CN113007860A (en) | Low-voltage protection control method and device and air conditioner | |
| CN114353249B (en) | Control method and device for multi-split air conditioner and multi-split air conditioner | |
| CN116007135B (en) | Control method and system for refrigerating oil return of air conditioning system | |
| CN114811860A (en) | Multi-split air conditioning system control method and multi-split air conditioning system | |
| CN108105940A (en) | Oil of air conditioner blocks up the detection method and air conditioner of failure | |
| CN112984867A (en) | Air conditioner heating oil return control method and device and air conditioner | |
| CN113915918A (en) | Refrigerator and refrigerator noise reduction method | |
| CN117249562A (en) | Air conditioner control method and device, storage medium and air conditioner | |
| CN112963950B (en) | Air conditioner control method and device, storage medium and air conditioner | |
| CN110154682B (en) | Temperature control method and system for vehicle air conditioner | |
| CN111076371A (en) | Control method and system for dynamic demand response of central air conditioner | |
| CN113639429B (en) | Method and device for controlling air conditioner and intelligent air conditioner | |
| CN111474858B (en) | Building energy management control system and method | |
| CN104566811A (en) | Control method for preventing halt and oil slinging of variable-frequency rotor compressor of household multiple online machine | |
| CN112728812B (en) | Oil return control method for multi-split air conditioning system in standby state | |
| EP4105489A1 (en) | Control method for centrifugal compressor and air conditioning system | |
| CN117249558B (en) | Air conditioner control method and device, air conditioner and storage medium | |
| CN113739384B (en) | Control method and system of central air-conditioning system based on cold machine operation strategy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |