CN115451611A - Super air conditioner network oil return control method - Google Patents
Super air conditioner network oil return control method Download PDFInfo
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- CN115451611A CN115451611A CN202210987991.1A CN202210987991A CN115451611A CN 115451611 A CN115451611 A CN 115451611A CN 202210987991 A CN202210987991 A CN 202210987991A CN 115451611 A CN115451611 A CN 115451611A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000003507 refrigerant Substances 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 42
- 238000007599 discharging Methods 0.000 claims description 18
- 238000005057 refrigeration Methods 0.000 claims description 14
- 238000004378 air conditioning Methods 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 3
- 108010001267 Protein Subunits Proteins 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 101
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
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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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/16—Lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2105—Oil temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
Abstract
The invention relates to the technical field of air conditioner oil return control, in particular to a super air conditioner network oil return control method, which comprises the following steps: no. 5, no. 4, no. 3, no. 2 and No. 1 machines are connected with a main pipeline in parallel through pipelines L1 and L8, and 5 machines are connected in parallel; no. 5, no. 4, no. 3 and No. 2 machines are connected in parallel to a pipeline L8 through pipelines L2 and L7; no. 5, no. 4 and No. 3 machines are connected in parallel to a pipeline L7 through pipelines L4 and L6; no. 5 and No. 4 machines are connected in parallel to a pipeline L6 through pipelines L4 and L5; the beneficial effects are that: the invention provides 5 outdoor units which are connected in parallel, only one of the outdoor units can be set as a main unit, the other four outdoor units are sub-units, the main unit and the sub-units are distinguished by setting different dial codes, the 128 indoor units are also connected in parallel, each indoor unit has a unique address code, as long as the main unit enters into oil return, the other sub-units also synchronously enter into oil return, and when the 5 outdoor units are started, the oil return control is carried out by judging the load rate of a compressor of the main unit.
Description
Technical Field
The invention relates to the technical field of air conditioner oil return control, in particular to a super air conditioner network oil return control method.
Background
In order to ensure the normal operation of the compressor, sufficient refrigeration oil must be provided in the air conditioning system to lubricate the compressor, otherwise the compressor can be seriously abraded and overheated to be damaged;
because the connecting pipeline of the indoor unit and the outdoor unit is short, most of the refrigeration oil can smoothly return to the compressor along with the circulation of the system, and the problem of oil return is generally not considered;
in the multi-split system, because the pipeline is long, the fall is large, the number of elbows is large, and the pipeline system is complex, the oil storage places in the system are more, and the oil return is difficult. As the system operation time increases, the amount of refrigerant oil accumulated in the system becomes excessive, and the compressor may malfunction due to oil shortage.
Disclosure of Invention
The invention aims to provide an oil return control method for a super air conditioner network, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a super air conditioner network oil return control method is characterized in that: the method comprises the following steps:
no. 5, no. 4, no. 3, no. 2 and No. 1 machines are connected with a main pipeline in parallel through pipelines L1 and L8, and 5 machines are connected in parallel;
no. 5, no. 4, no. 3 and No. 2 machines are connected in parallel to a pipeline L8 through pipelines L2 and L7;
no. 5, no. 4 and No. 3 machines are connected in parallel to a pipeline L7 through pipelines L4 and L6;
the machines No. 5 and No. 4 are connected in parallel to the line L6 through the lines L4 and L5.
Preferably, the unit 1 is a master unit, the unit 2 is a slave unit, the unit 1,3 is a slave unit, the unit 2,4 is a slave unit, the unit 3,5 is a slave unit 4, and the pipelines L6, L7 and L8 are all connected with the outdoor unit.
Preferably, the oil return instruction is sent by the host machine No. 1, and the sub machines No. 2, no. 3, no. 4 and No. 5 synchronously enter oil return control after receiving the instruction.
Preferably, the load rate of the host is the ratio of the capacity of the indoor unit running in the air-conditioning network system to the capacity of all the indoor units connected in the system, under the refrigeration condition, when the load rate of the host 1 is less than 20%, oil return is performed after 2 hours, and when the load rate of the host 1 is more than or equal to 20%, oil return is performed after 4 hours.
Preferably, when the load factor of the host machine No. 1 machine under the refrigeration condition is less than or equal to 30%, the oil returns after the host machine No. 1 machine is started, and when the load factor of the host machine is more than 30%, the oil returns after 3 minutes after the host machine is started and controlled.
Preferably, the control mode for controlling the sub-machine to return oil under the refrigeration condition of the machine No. 1 of the main machine is two, one is that when the load rate of the machine No. 1 of the main machine is larger than 30%, the sub-machine starts according to the sending of an oil return preparation instruction, and the other is that when the load rate of the machine No. 1 of the main machine is smaller than or equal to 30%, the sub-machine starts according to the starting of an oil return action.
Preferably, the oil return operation under the refrigeration condition of the machine 1 of the host machine is carried out for a minutes, the oil return of the machine 1 of the host machine is finished, the oil return control is carried out for b minutes, the exhaust temperature of the compressor 1 and the exhaust temperature of the compressor 2 both meet the requirement of higher saturation temperature + x ℃ for s seconds, the oil return of the machine 1 of the host machine is finished or the oil return control is carried out for b minutes, the suction temperature-lower saturation temperature is less than x ℃ for s +20 seconds, the oil return of the machine 1 of the host machine is finished, and a, b, x and s are all adjustable data.
Preferably, the gas-liquid separator prevents the liquid refrigerant from flowing into the press machine due to the excessive refrigerant accumulated in the oil return process, so that the refrigerant in the gas-liquid separator is continuously discharged in the oil return process, and the control of forcibly discharging the refrigerant in the gas-liquid separator is also finished after the oil return process is finished. There are three conditions, one of which is satisfied, and the control of the forced discharge of the refrigerant is ended: (1) the exhaust temperature of the compressor is less than the high-pressure saturation temperature + x ℃, the compressor is operated for a + b minutes under the condition, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished. (2) And (3) 1 minute after the oil return control is finished, and the exhaust temperature of the No. 1 compressor and the exhaust temperature of the No. 2 compressor are more than the high-pressure saturation temperature plus 2x ℃, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished. (3) And (5) after the oil return control is finished for 1 minute, and the low-pressure is less than 0.1MPa, the control of forcibly discharging the refrigerant in the gas-liquid separator is finished.
Preferably, the host load factor is a ratio of the capacity of an indoor unit operating in the air conditioning network system to the capacity of all indoor units connected in the system. When the machine No. 1 of the main machine meets any one of the following conditions under the heating condition, the sub machine enters oil return: (1) the load rate of the host machine No. 1 machine is less than 20%, and the submachine enters oil return after 2 hours. (2) When the load factor of the host machine No. 1 machine is more than or equal to 20 percent, the submachine enters oil return after 4 hours. (3) When the load rate of the host machine No. 1 is less than or equal to 30%, the submachine enters oil return after the host machine No. 1 is started. (4) When the load rate of the host machine No. 1 is more than 30%, the sub machine enters oil return control after 3 minutes after the host machine is started and controlled.
Preferably, when the load factor of the host machine No. 1 machine is greater than 30%, the starting of the sub machine is started according to the sending of the oil return preparation instruction, and when the load factor of the host machine No. 1 machine is less than or equal to 30%, the starting of the sub machine is started according to the starting of the oil return action
Preferably, the oil return operation of the machine No. 1 of the main machine is carried out for a minutes, and the oil return is finished; the oil return is controlled for b minutes, the exhaust temperature of the compressor 1 and the exhaust temperature of the compressor 2 both meet the requirement of higher pressure saturation temperature plus x ℃, the operation lasts for s seconds, and the oil return is finished; controlling oil return for 2 minutes, controlling the air suction temperature to be lower than (x + 5) DEG C and continuing for (s + 20) seconds, and ending the oil return;
preferably, the gas-liquid separator prevents the liquid refrigerant from flowing into the press machine due to the excessive refrigerant accumulated in the heating oil return process, so that the refrigerant in the gas-liquid separator is discharged in a continuous control manner in the oil return process, and after the oil return process is finished, the control of forcibly discharging the refrigerant in the gas-liquid separator is also finished, and the following three conditions are met, wherein the control of forcibly discharging the refrigerant is finished when one of the following conditions is met: (1) THO-D is less than CT (high pressure saturation temperature) + x ℃, the operation is carried out for (a + b) minutes under the condition, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished. (2) And (3) 1 minute after the oil return control is finished, and the exhaust temperature of the No. 1 compressor and the exhaust temperature of the No. 2 compressor are more than the high-pressure saturation temperature plus 2x ℃, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished. (3) And (5) after the oil return control is finished for 1 minute, and the low-pressure is less than 0.1MPa, the control of forcibly discharging the refrigerant in the gas-liquid separator is finished.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides 5 outdoor units which are connected in parallel, only one of the outdoor units can be set as a main unit, the other four outdoor units are sub-units, the main unit and the sub-units are distinguished by setting different dial codes, 128 indoor units are also connected in parallel, each indoor unit has a unique address code, as long as the main unit enters into oil return, other sub-units also synchronously enter into oil return, when the 5 outdoor units are started, the oil return control is started by judging the load rate of a compressor of the main unit, and when the 5 outdoor units are controlled to return oil, the oil return control is judged to be finished by judging the integration of oil return action time, the exhaust temperature, the high-pressure saturation temperature, the suction temperature and the low-pressure saturation temperature of the press.
Drawings
FIG. 1 is a schematic view of a connection structure according to the present invention;
fig. 2 is a schematic diagram of a control oil return circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.
Referring to fig. 1 to 2, the present invention provides a technical solution: a super air conditioner network oil return control method is characterized in that: the method comprises the following steps: no. 5, no. 4, no. 3, no. 2 and No. 1 machines are connected with a main pipeline in parallel through pipelines L1 and L8,5 machines are connected in parallel, the No. 1 machine set is a main machine, the No. 2 machine set is a submachine, the No. 1 and No. 3 machine set is a submachine, the No. 2 and No. 4 machine set is a submachine, the No. 3 and No. 5 machine set is a submachine 4, pipelines L6, L7 and L8 are connected with an outdoor machine, an oil return instruction is sent by the No. 1 machine of the main machine, and the No. 2, no. 3, no. 4 and No. 5 machines synchronously enter oil return control after receiving the instruction;
no. 5, no. 4, no. 3 and No. 2 machines are connected in parallel to a pipeline L8 through pipelines L2 and L7, no. 5, no. 4 and No. 3 machines are connected in parallel to the pipeline L7 through pipelines L4 and L6, and No. 5 and No. 4 machines are connected in parallel to the pipeline L6 through pipelines L4 and L5;
the load rate of the host machine is the ratio of the capacity of the indoor machine running in the air-conditioning network system to the capacity of all the indoor machines connected in the system, under the refrigeration condition, when the load rate of the host machine No. 1 machine is less than 20%, oil return is carried out after 2h, and when the load rate of the host machine No. 1 machine is more than or equal to 20%, oil return is carried out after 4 h;
when the load factor of the machine 1 of the main machine is less than or equal to 30 percent under the refrigeration condition, the machine 1 of the main machine enters oil return after being started, when the load factor of the main machine is more than 30 percent, the machine starts oil return control after 3 minutes, and the control mode of controlling the sub machine to return oil under the refrigeration condition of the machine 1 of the main machine has two modes, one mode is that when the load factor of the machine 1 of the main machine is more than 30 percent, the sub machine starts to start according to the sending of an oil return preparation instruction, and the other mode is that when the load factor of the machine 1 of the main machine is less than or equal to 30 percent, the sub machine starts to start according to the starting of the oil return action. And the oil return operation of the machine No. 1 of the main machine is carried out for a minutes under the refrigeration condition, the oil return of the machine No. 1 of the main machine is finished, the oil return control is carried out for b minutes, the exhaust temperature of the compressor 1 and the exhaust temperature of the compressor 2 both meet the temperature of < high-pressure saturation temperature + x ℃, the operation lasts for s seconds, and the oil return of the machine No. 1 of the main machine is finished. Controlling oil return for b minutes, controlling the suction temperature to be lower than the low-pressure saturation temperature and keeping the suction temperature to be lower than x ℃ for s +20 seconds, finishing oil return of the machine No. 1 of the main machine, wherein a, b, x and s are all adjustable data;
the gas-liquid separator prevents the liquid refrigerant from flowing into the compressor due to the accumulation of excessive refrigerant in the oil return process, so that the refrigerant in the gas-liquid separator is discharged in a continuous control manner in the oil return process, after the oil return is finished, the control of the forced discharge of the refrigerant in the gas-liquid separator is also finished, the exhaust temperature of the compressor is less than the high-pressure saturation temperature + x ℃, the compressor operates for a + b minutes under the condition, and the control of the forced discharge of the refrigerant in the gas-liquid separator is finished; 1 minute after the oil return control is finished, and the exhaust temperature of the No. 1 compressor and the exhaust temperature of the No. 2 compressor are more than the high-pressure saturation temperature plus 2x ℃, the control of forcibly discharging the refrigerant in the gas-liquid separator is finished; after 1 minute after the oil return control is finished and the low-pressure is less than 0.1MPa, the control of the forced discharge of the refrigerant in the gas-liquid separator is finished; the load rate of the host is the ratio of the capacity of the indoor unit operated in the air-conditioning network system to the capacity of all the indoor units connected in the system; under the heating condition, when the load rate of the host machine No. 1 is less than 20%, returning oil after 2 hours; when the load rate of the host machine No. 1 machine is more than or equal to 20 percent, returning oil after 4 hours; when the load rate of the machine 1 of the host machine is less than or equal to 30 percent, the machine 1 of the host machine enters oil return after the start is finished; when the load rate of the host machine No. 1 is more than 30%, the oil return control is performed after 3 minutes after the host machine starting control is finished. When the load rate of the host machine No. 1 machine is more than 30%, oil return is carried out in a mode that the submachine starts to start when an oil return preparation instruction is sent; when the load factor of the machine 1 of the main machine is less than or equal to 30 percent, the oil return is carried out in a way that the sub machine starts to start when the oil return action starts. The oil return operation of the machine No. 1 of the main machine is carried out for a minutes, and the oil return is finished; the oil return is controlled for b minutes, the exhaust temperature of the compressor 1 and the exhaust temperature of the compressor 2 both meet the requirement of higher pressure saturation temperature plus x ℃, the operation lasts for s seconds, and the oil return is finished; and oil return control is finished after 2 minutes, the air suction temperature-low pressure saturation temperature is less than (x + 5) DEG C for (s + 20) seconds. The gas-liquid separator prevents the liquid refrigerant from flowing into the press due to excessive refrigerant accumulation in the heating oil return process, so that the refrigerant in the gas-liquid separator is discharged under continuous control in the oil return process, and after the oil return process is finished, the control of the forced discharge of the refrigerant in the gas-liquid separator is also finished, and the following three conditions are met, wherein the control of the forced discharge of the refrigerant is finished: (1) THO-D is less than CT (high pressure saturation temperature) + x ℃, the operation is carried out for (a + b) minutes under the condition, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished. (2) And (3) 1 minute after the oil return control is finished, and the exhaust temperature of the No. 1 compressor and the exhaust temperature of the No. 2 compressor are more than the high-pressure saturation temperature plus 2x ℃, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished. (3) And (5) after the oil return control is finished for 1 minute, and the low-pressure is less than 0.1MPa, the control of forcibly discharging the refrigerant in the gas-liquid separator is finished.
The method is characterized in that 5 outdoor units are connected in parallel, only one outdoor unit can be set as a main unit, the other four outdoor units are sub-units, the main unit and the sub-units are distinguished by setting different dial codes, 128 indoor units are also connected in parallel, each indoor unit has a unique address code, as long as the main unit enters into oil return, other sub-units also synchronously enter into oil return, when the 5 outdoor units are started, oil return control is carried out by judging the load rate of a compressor of the main unit, and when the 5 outdoor units are controlled to return oil, the oil return control is comprehensively judged to be finished by judging the oil return action time, the exhaust temperature, the high-pressure saturation temperature, the suction temperature and the low-pressure saturation temperature of the press.
Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications within the spirit and scope of the present application defined and determined by the appended claims will be apparent to those skilled in the art from this disclosure.
Claims (12)
1. A super air conditioner network oil return control method is characterized in that: the method comprises the following steps:
no. 5, no. 4, no. 3, no. 2 and No. 1 machines are connected with a main pipeline in parallel through pipelines L1 and L8, and 5 machines are connected in parallel;
no. 5, no. 4, no. 3 and No. 2 machines are connected in parallel to a pipeline L8 through pipelines L2 and L7;
no. 5, no. 4 and No. 3 machines are connected in parallel to a pipeline L7 through pipelines L4 and L6;
no. 5 and No. 4 machines are connected in parallel to a pipeline L6 through pipelines L4 and L5;
a gas-liquid separator.
2. The super air conditioner network oil return control method according to claim 1, characterized in that: the machine set 1 is a main machine, the machine set 2 is a submachine, the machine set 1,3 is a submachine, the machine set 2, the machine set 4 is a submachine, the machine set 3,5 is a submachine 4, and pipelines L6, L7 and L8 are connected with an outdoor unit.
3. The super air conditioner network oil return control method according to claim 2, characterized in that: the oil return instruction is sent by the host machine No. 1, and the submachine No. 2 machine, the submachine No. 3 machine, the submachine No. 4 machine and the submachine No. 5 machine synchronously enter oil return control after receiving the instruction.
4. The super air conditioning network oil return control method according to claim 3, characterized in that: the load rate of the main machine is the ratio of the capacity of the indoor machine running in the air-conditioning network system to the capacity of all the indoor machines connected in the system, under the refrigeration condition, when the load rate of the machine No. 1 of the main machine is less than 20%, oil return is carried out after 2 hours, and when the load rate of the machine No. 1 of the main machine is more than or equal to 20%, oil return is carried out after 4 hours.
5. The super air conditioning network oil return control method according to claim 4, characterized in that: when the load factor of the host machine No. 1 machine is less than or equal to 30% under the refrigeration condition, the host machine No. 1 machine enters oil return after being started, and when the load factor of the host machine is more than 30%, the host machine enters oil return control after being started and controlled for 3 minutes.
6. The super air conditioner network oil return control method according to claim 5, characterized in that: the control method for controlling the sub-machine to return oil under the refrigeration condition of the machine No. 1 of the main machine comprises two control modes, wherein one control mode is that when the load rate of the machine No. 1 of the main machine is larger than 30%, the sub-machine starts according to the sending of an oil return preparation instruction, and the other control mode is that when the load rate of the machine No. 1 of the main machine is smaller than or equal to 30%, the sub-machine starts according to the oil return action.
7. The super air conditioner network oil return control method according to claim 6, characterized in that: the oil return operation of the machine No. 1 of the main machine is carried out for a minutes under the refrigeration condition, the oil return of the machine No. 1 of the main machine is finished, the oil return control is carried out for b minutes, the exhaust temperature of the compressor 1 and the exhaust temperature of the compressor 2 both meet the requirement of higher-pressure saturation temperature and x ℃, the duration is s seconds, the oil return of the machine No. 1 of the main machine is finished or the oil return control is carried out for b minutes, the air suction temperature and the lower-pressure saturation temperature are less than x ℃, the duration is s +20 seconds, the oil return of the machine No. 1 of the main machine is finished, and a, b, x and s are adjustable data.
8. The super air conditioning network oil return control method according to claim 7, characterized in that: the gas-liquid separator prevents the refrigerant in the gas-liquid separator from being discharged in a continuous control manner in the oil return process, and after the oil return process is finished, the control of the refrigerant forced discharge in the gas-liquid separator is also finished, and the following three conditions are met, wherein the control of the refrigerant forced discharge is finished: (1) the exhaust temperature of the compressor is less than the high-pressure saturation temperature + x ℃, the compressor operates for a + b minutes under the condition, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished; (2) 1 minute after the oil return control is finished, and the exhaust temperature of the No. 1 compressor and the exhaust temperature of the No. 2 compressor are more than the high-pressure saturation temperature plus 2x ℃, the control of the forced discharge of the refrigerant in the gas-liquid separator is finished; (3) and (5) after the oil return control is finished for 1 minute, and the low-pressure is less than 0.1MPa, the control of forcibly discharging the refrigerant in the gas-liquid separator is finished.
9. The super air conditioner network oil return control method according to claim 8, characterized in that: the load rate of the host is the ratio of the capacity of the indoor unit operated in the air-conditioning network system to the capacity of all the indoor units connected in the system; when the machine No. 1 of the main machine meets any one of the following conditions under the heating condition, the sub machine enters oil return: (1) the load rate of the host machine No. 1 machine is less than 20%, and the submachine enters oil return after 2 hours; (2) when the load rate of the host machine No. 1 is more than or equal to 20 percent, the submachine enters oil return after 4 hours; (3) when the load rate of the machine 1 of the main machine is less than or equal to 30 percent, the sub machine enters oil return after the machine 1 of the main machine is started; (4) when the load rate of the host machine No. 1 machine is more than 30%, the sub machine enters oil return control after the host machine is started and controlled for 3 minutes.
10. The super air conditioning network oil return control method according to claim 9, characterized in that: when the load rate of the machine No. 1 of the main machine is more than 30 percent, the starting of the sub machine is carried out in a mode of sending an oil return preparation instruction, and when the load rate of the machine No. 1 of the main machine is less than or equal to 30 percent, the starting of the sub machine is carried out in a mode of starting the oil return action.
11. The super air conditioning network oil return control method according to claim 10, characterized in that: the oil return operation of the machine No. 1 of the main machine is carried out for a minutes, and the oil return is finished; controlling oil return for b minutes, wherein the exhaust temperature of the compressor 1 and the exhaust temperature of the compressor 2 both meet the requirement of higher saturation temperature plus x ℃, and the control lasts for s seconds, and the oil return is finished; and oil return control is finished after 2 minutes, the air suction temperature-low pressure saturation temperature is less than (x + 5) DEG C for (s + 20) seconds.
12. The super air conditioning network oil return control method according to claim 11, characterized in that: the gas-liquid separator prevents the liquid refrigerant from flowing into the press due to excessive refrigerant accumulation in the heating oil return process, so that the refrigerant in the gas-liquid separator is discharged under continuous control in the oil return process, and after the oil return process is finished, the control of the forced discharge of the refrigerant in the gas-liquid separator is also finished, and the following three conditions are met, wherein the control of the forced discharge of the refrigerant is finished: (1) THO-D is less than CT (high pressure saturation temperature) + x ℃, the operation is carried out for (a + b) minutes under the condition, and the control of forcibly discharging the refrigerant in the gas-liquid separator is finished; (2) 1 minute after the oil return control is finished, and the exhaust temperature of the No. 1 compressor and the exhaust temperature of the No. 2 compressor are more than the high-pressure saturation temperature plus 2x ℃, the control of forcibly discharging the refrigerant in the gas-liquid separator is finished; (3) and (5) after the oil return control is finished for 1 minute, and the low-pressure is less than 0.1MPa, the control of forcibly discharging the refrigerant in the gas-liquid separator is finished.
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