CN104848599B - Air-conditioning system and its control method - Google Patents
Air-conditioning system and its control method Download PDFInfo
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- CN104848599B CN104848599B CN201510275839.0A CN201510275839A CN104848599B CN 104848599 B CN104848599 B CN 104848599B CN 201510275839 A CN201510275839 A CN 201510275839A CN 104848599 B CN104848599 B CN 104848599B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 67
- 239000007788 liquid Substances 0.000 claims description 78
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 238000000926 separation method Methods 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims 1
- 235000003642 hunger Nutrition 0.000 abstract description 15
- 230000037351 starvation Effects 0.000 abstract description 15
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 106
- 239000003507 refrigerant Substances 0.000 description 30
- 239000010687 lubricating oil Substances 0.000 description 24
- 238000010438 heat treatment Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 239000010725 compressor oil Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 235000015927 pasta Nutrition 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 206010008469 Chest discomfort Diseases 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000005247 gettering Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
-
- 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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
-
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way valves
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides a kind of air-conditioning system and its control method.The air-conditioning system includes the outdoor unit, throttling arrangement, indoor set, the first compressor and the second compressor that are successively set on the same circuit, and air-conditioning system also includes：Adjusting means, adjusting means is used to be adjusted the annexation between the first compressor and the second compressor, the first compressor and the second compressor is switched between series connection and parallel connection, or make the second compressor isolated operation, and the fluid in the first compressor and the second compressor is adjusted.On the one hand the system can realize the series connection and parallel connection of compressor, and freezes and heat switching, on the other hand, additionally it is possible to ensure that compressor will not influence service life or running efficiency because of oil starvation or rich oil, it is ensured that the long-term reliability of compressor.
Description
Technical field
The present invention relates to air-conditioning system technical field, more particularly to a kind of air-conditioning system and its control method.
Background technology
Environment temperature is lower, and the demand to air-conditioning heating amount is bigger, but the heat pump of single stage compress can only accomplish subzero at present
20 degree of normal startup optimizations, and heating capacity deep fades, heating effect it cannot be guaranteed that, unit reliability is also examined by sternness
Test.
Compared to single stage compress heat pump, with air injection enthalpy-increasing Two-stage Compression system, heating capacity is larger at low temperature, and efficiency is higher.
And Two-stage Compression system can reduce the pressure ratio of single-stage compressor, delivery temperature is reduced, while gettering efficiency and compression effect can be improved
Rate, so as to lift heating capacity and heating efficiency.
Compressor is air-conditioner " heart ", there is substantial amounts of friction when the compressor is operated, inside it, to ensure compressor
Reliability service simultaneously improves the performance of compressor, and lubrication is one of important link, therefore lubricating oil is essential to compressor
, lubricating oil has lubrication, cooling, sealing etc. to act on to compressor.And requirement of the compressor to the lubricating oil amount of having, if compressor
In lubricating oil cross at least can lack of lubrication, and then damage compressor, if lubricating oil in compressor is excessive, refrigeration can be reduced
Performance, in some instances it may even be possible to occur that oil hits the phenomenon for damaging compressor.When air-conditioning system is run, parts of lubricating oil can be with refrigerant
Compressor being discharged together, being entered into system pipe arrangement, condenser and evaporator, the lubricating oil only in system is discharged to can be suitable
Profit returns to compressor, maintains the dynamic equilibrium of oil, just can ensure that compressor not oil starvation.Therefore certain oil reserve is to ensure pressure
The fundamental prerequisite of contracting machine reliability service, only when oil reserve exceedes the minimum oil mass of its needs, just can guarantee that compressor safety
Reliability service, while the oil reserve in compressor can not be excessive, can otherwise reduce refrigeration performance.
For the Two-stage Compression system that two compressors are connected, lubricating oil regulation is difficult to ensure that the oil level of two compressors is equal
It is balanced, easily causes a situation for compressor rich oil another compressor oil starvation, but due to two suctions of compressor
Atmospheric pressure is different, when lubricating oil is all entered into a compressor, it is impossible to realize the equal oil between compressor, therefore once
When a compressor lubricant oil in Two-stage Compression system is lacked of proper care, it is difficult to meet demand for lubricating oil in the short time.
The content of the invention
The invention provides a kind of air-conditioning system and its control method, to solve the pressure in air-conditioning system of the prior art
The lubricating oil of contracting machine is difficult to the problem of balance.
According to an aspect of the invention, there is provided a kind of air-conditioning system, the air-conditioning system includes being successively set on same
Outdoor unit, throttling arrangement, indoor set, the first compressor and the second compressor on loop, air-conditioning system also include：Regulation dress
Put, adjusting means be used for the annexation between the first compressor and the second compressor is adjusted, make the first compressor and
Second compressor switches between series connection and parallel connection, or makes the second compressor isolated operation, and the first compressor and second are pressed
Fluid in contracting machine is adjusted.
Further, adjusting means includes：Connection in series-parallel adjustment portion, connection in series-parallel adjustment portion is used to make the first compressor and second
Compressor switches between series connection and parallel connection；Fluid adjustment portion, fluid adjustment portion is used for the first compressor and the second compressor
Interior fluid is adjusted.
Further, air-conditioning system also includes：Gas-liquid separator, the first compressor and the second compressor are and gas-liquid separation
Device is connected, and the air entry of the first compressor is connected with the gas outlet of gas-liquid separator, and connection in series-parallel adjustment portion includes：First four-way
Valve, the first valve port of the first four-way valve is connected with the gas outlet of the first compressor, and the second valve port of the first four-way valve and second is pressed
The air entry connection of contracting machine, the 3rd valve port of the first four-way valve is connected with the gas outlet of gas-liquid separator, and the of the first four-way valve
Pipeline connection between four valve ports and the second compressor and outdoor unit, wherein, first valve port and the first four-way of the first four-way valve
Valve the second valve port conducting, and the first four-way valve the 3rd valve port and the first four-way valve the 4th valve port turn on when, first compression
Machine and the second compressor are in series connection；The 4th valve port conducting of first valve port and the first four-way valve of the first four-way valve, and
When second valve port of the first four-way valve and the 3rd valve port of the first four-way valve are turned on, the first compressor and the second compressor are in simultaneously
Connection state.
Further, air-conditioning system also includes：Gas-liquid separator, the first compressor and the second compressor are and gas-liquid separation
Device is connected, and the first equal oilhole, the oil return that the first equal oilhole passes through the first pipeline and gas-liquid separator are provided with the first compressor
Mouth connection, is provided with the second equal oilhole, the oil return that the second equal oilhole passes through second pipe and gas-liquid separator on the second compressor
Mouth connection, fluid adjustment portion includes：First control valve, the first control valve is arranged on the first pipeline to control the logical of the first pipeline
It is disconnected；Second control valve, the second control valve is arranged on second pipe to control the break-make of second pipe.
Further, air-conditioning system also includes oil eliminator, the first filter, the first capillary and oil return valve, wherein,
Oil eliminator is arranged on the pipeline between the second compressor and outdoor unit, the 4th valve port of the first four-way valve and oil eliminator with
Pipeline connection between second compressor, the oil-out of oil eliminator is connected by the 3rd pipeline with the oil return opening of gas-liquid separator
Connect；First filter, the first capillary and oil return valve are arranged on the 3rd pipeline, and along oil eliminator to gas-liquid separator
Direction be sequentially arranged.
Further, it is provided with check valve on the pipeline between the 4th valve port and oil eliminator of the first four-way valve.
Further, the 3rd control valve is provided with the pipeline between check valve and oil eliminator.
Further, the first compressor to first control valve between pipeline on be disposed with the second filter and second
Capillary；Second compressor to first control valve between pipeline on be disposed with the 3rd filter and three capillary.
Further, air-conditioning system also includes the second four-way valve, the first valve port of the second four-way valve and going out for oil eliminator
Gas port is connected, and the second valve port of the second four-way valve is connected with outdoor unit, and the 3rd valve port of the second four-way valve is connected with indoor set, the
4th valve port of two four-way valves is connected with the entrance of gas-liquid separator.
Further, throttling arrangement includes the first throttle unit being connected in turn on the pipeline between outdoor unit and indoor set
Part and the second restricting element, are provided with fluid reservoir on the pipeline between first throttle element and the second restricting element, fluid reservoir leads to
The 4th pipeline is crossed to be connected with the air entry of the second compressor；Adjusting means also includes the 4th control valve, and the 4th control valve is arranged on
On 4th pipeline, wherein, the 4th valve port conducting of first valve port and the first four-way valve of the first four-way valve, and the first four-way valve
When 3rd valve port of the second valve port and the first four-way valve is turned on, the 3rd control valve and the 4th control valve are in when closing, the second pressure
Contracting machine isolated operation.
Further, the first equal oilhole is that the first equal oilhole compresses to first to the distance of the exhaust valve plate of the first compressor
1/2 of distance at the minimum oil level of machine；Second equal oilhole is arrived for the second equal oilhole to the distance of the exhaust valve plate of the second compressor
The 1/2 of the distance of the minimum oil level of the second compressor.
Further, the aperture of the first equal oilhole and the second equal oilhole is in the range of 4mm to 8mm.
According to another aspect of the present invention, improve a kind of control method of air-conditioning system, air conditioner system control method by
Above-mentioned air-conditioning system realization, including：Detecting step：Detect the first compressor and or the second compressor in fluid whether reach
To poised state；Judge to perform step：If the first compressor and or the second compressor in fluid be not up to poised state,
Adjusting means is then adjusted, is made the first compressor and the second compressor is in parallel connection until the first compressor and the second compressor
Inner fluid reaches balance.
Further, in judging to perform step, the first four-way valve is adjusted, makes first valve port and first of the first four-way valve
Four-way valve the second valve port connection, and the first four-way valve the 3rd valve port and the first four-way valve the 4th valve port connect when, first
Compressor and the second compressor are in series connection；The first four-way valve is adjusted, makes first valve port and the one or four of the first four-way valve
Port valve the 4th valve port conducting, and the first four-way valve the second valve port and the first four-way valve the 3rd valve port turn on when, first pressure
Contracting machine and the second compressor are in parallel connection.
Further, in judging to perform step, if the first compressor inner fluid liquid level is higher than the first equal oilhole, beat
The first control valve is driven until the fluid in the first compressor reaches poised state；If the second compressor inner fluid liquid level is higher than the
Two equal oilholes, then open second and control valve until the fluid in the second compressor reaches balance.
Apply the technical scheme of the present invention, adjusting means is provided with air-conditioning system, by the adjustment effect of adjusting means,
The first compressor and the second compressor can be made to switch between series connection and parallel connection, or make the second compressor isolated operation, when need
When being adjusted to the fluid of the first compressor and the second compressor, it is only necessary to switch the first compressor and the second compressor
To the mode being connected in parallel, then refrigerant and lubrication are provided to the first compressor and the second compressor by gas-liquid separator
Oil, while being adjusted to the fluid in the first compressor and the second compressor by the adjustment effect of adjusting means, is easy to full
The equal oily demand of the first compressor of foot and the second compressor.On the one hand the air-conditioning system of the application can realize two compressors
Series connection and parallel connection, and freeze and heat switching, on the other hand, additionally it is possible to ensure that compressor will not be because of oil starvation or rich oil
Influence service life or running efficiency, it is ensured that the long-term reliability of compressor.And, this system can also realize broader system
Cold operation and heating operation scope and operational efficiency, while improving heating capacity and heating efficiency and superhigh temperature when system under ultralow temperature
Refrigerating capacity and operational efficiency when cold.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, of the invention to show
Meaning property and its illustrates, for explaining the present invention, not constitute inappropriate limitation of the present invention embodiment.In the accompanying drawings：
Fig. 1 diagrammatically illustrates the annexation figure of air-conditioning system of the invention；
When the first compressor and the second compressor that Fig. 2 diagrammatically illustrates air-conditioning system of the invention are in series operation
Annexation figure；
When the first compressor and the second compressor that Fig. 3 diagrammatically illustrates air-conditioning system of the invention are in parallel running
Annexation figure；
Fig. 4 diagrammatically illustrates annexation figure during the second compressor isolated operation of air-conditioning system of the invention；With
And
Fig. 5 diagrammatically illustrates the front view of the first compressor of the invention or the second compressor.
Description of reference numerals：
10th, outdoor unit；20th, throttling arrangement；21st, first throttle element；22nd, the second restricting element；30th, indoor set；40th,
One compressor；41st, the first equal oilhole；50th, the second compressor；51st, the second equal oilhole；200th, gas-liquid separator；61st, connection in series-parallel is adjusted
Section portion；611st, the first four-way valve；6111st, the first valve port；6112nd, the second valve port；6113rd, the 3rd valve port；6114th, the 4th valve port；
62nd, fluid adjustment portion；621st, the first control valve；622nd, the second control valve；70th, the first pipeline；80th, second pipe；90th, oil is separated
Device；100th, the first filter；110th, the first capillary；120th, oil return valve；130th, the 3rd pipeline；140th, check valve；150th, the 3rd
Control valve；160th, the second four-way valve；161st, the first valve port；162nd, the second valve port；163rd, the 3rd valve port；164th, the 4th valve port；
170th, fluid reservoir；180th, the 4th pipeline；190th, the 4th control valve；210th, the second filter；220th, the second capillary；230th, the 3rd
Filter；240th, three capillary.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
Referring to shown in Fig. 1 to Fig. 5, a kind of embodiments in accordance with the present invention, there is provided air-conditioning system.
The air-conditioning system of the present embodiment includes the outdoor unit 10, throttling arrangement 20, the interior that are successively set on the same circuit
Machine 30, the first compressor 40 and the second compressor 50.
Air-conditioning system also includes gas-liquid separator 200 and adjusting means, during connection, the first compressor 40 and the second compressor
50 are connected with gas-liquid separator 200；Adjusting means is used to close the connection between the first compressor 40 and the second compressor 50
System is adjusted, and the first compressor 40 and the second compressor 50 is switched between series connection and parallel connection, or make the second compressor 50
Isolated operation, and the fluid in the first compressor 40 and the second compressor 50 is adjusted.
Structure according to the present embodiment it is recognised that be provided with adjusting means in the air-conditioning system of the application, by regulation
The adjustment effect of device, can be such that the first compressor 40 and the second compressor 50 switches between series connection and parallel connection, or make second
The isolated operation of compressor 50, when needing to be adjusted the fluid of the first compressor 40 and the second compressor 50, it is only necessary to will
First compressor 40 and the second compressor 50 are switched to the mode being connected in parallel, then by gas-liquid separator 200 to the first pressure
40 and second compressor of contracting machine 50 provides refrigerant and lubricating oil, while being compressed to first by the adjustment effect of adjusting means
Fluid in the compressor 50 of machine 40 and second is adjusted, and is easy to meet the equal oily need of the first compressor 40 and the second compressor 50
Ask, substantially increase the reliability of air-conditioning system, extend the service life of compressor, air-conditioning system is improve to a certain extent
The performance of system.
Refer again to shown in Fig. 1, the adjusting means in the present embodiment includes connection in series-parallel adjustment portion 61 and fluid adjustment portion 62.
Wherein, connection in series-parallel adjustment portion 61 is used to make the first compressor 40 and the second compressor 50 be cut between series connection and parallel connection
Change；Fluid adjustment portion 62 is used to be adjusted the fluid in the first compressor 40 and the second compressor 50.
Preferably, the air entry of first compressor 40 of the present embodiment is connected with the gas outlet of gas-liquid separator 200, and string is simultaneously
Connection adjustment portion 61 includes the first four-way valve 611, the first valve port 6111 of first four-way valve 611 and the outlet of the first compressor 40
Mouth connection, the second valve port 6112 of the first four-way valve 611 is connected with the air entry of the second compressor 50, the first four-way valve 611
3rd valve port 6113 is connected with the gas outlet of gas-liquid separator 200, and the 4th valve port 6114 and second of the first four-way valve 611 compresses
Pipeline connection between machine 50 and outdoor unit 10.In the process of work, closed by the connection of each valve port to the first four-way valve 611
System adjusts, and the first compressor 40 and the second compressor 50 can just switched between series connection and parallel connection, simple structure,
It is easy to implement.
Specifically, when the first valve port 6111 of the first four-way valve 611 and the second valve port 6112 of the first four-way valve 611 are led
It is logical, and the 3rd valve port 6113 of the first four-way valve 611 and the 4th valve port 6114 of the first four-way valve 611 are when turning on, the first compression
The compressor 50 of machine 40 and second is in series connection；First valve port 6111 of the first four-way valve 611 and the of the first four-way valve 611
Four valve ports 6114 are turned on, and the second valve port 6112 of the first four-way valve 611 and the 3rd valve port 6113 of the first four-way valve 611 are turned on
When, the first compressor 40 and the second compressor 50 are in parallel connection.
Preferably, be provided with the first equal oilhole 41 on the first compressor 40, the first equal oilhole 41 by the first pipeline 70 with
The oil return opening connection of gas-liquid separator 200, is provided with the second equal oilhole 51 on the second compressor 50, the second equal oilhole 51 is by the
Two pipelines are connected with the oil return opening of gas-liquid separator 200.Fluid adjustment portion 62 in the present embodiment includes the first control He of valve 621
Second control valve 622, the first control valve 621 is arranged on the first pipeline 70 to control the break-make of the first pipeline 70；Second control
Valve 622 is arranged on second pipe 80 to control the break-make of second pipe 80.
In actual design, the first equal oilhole 41 is arranged on the housing of high pressure chest (discharge chamber) side of the first compressor 40
On, similarly, the second equal oilhole 51 is also disposed on the on high-tension side housing of the second compressor 50, the first equal oilhole 41 and second
Equal oilhole 51 is respectively positioned on the top of minimum oil level required during corresponding compressor operating, and under correspondence Compressor Air Exhaust Valve Plate
Side, as shown in Figure 5.
In the production of compressor, compressor producer has individual minimum requirements amount to compressor oil level, what the compressor was allowed
Minimum oil level is positively located in exhaust valve plate lower section, takes the height at exhaust valve plate to the minimum oil level for h, while considering compression
Its pasta is concave in the process of running for machine, i.e., the center of pasta will be slightly less than along the oil level at compressor inwall, this implementation
The distance of the exhaust valve plate of the first equal compressor of oilhole 41 to the first 40 in example is the first equal compressor of oilhole 41 to the first 40
1/2 of distance at minimum oil level；The distance of the exhaust valve plate of the second equal compressor of oilhole 51 to the second 50 is the second equal oilhole
The 1/2 of the distance of the minimum oil level of the 51 to the second compressor 50, i.e., the position of the equal oilhole in the present embodiment is located at will higher than producer
At the minimum oil level 2h/3 for asking.
Preferably, the aperture of the first equal oilhole 41 and the second equal oilhole 51 in the present embodiment is in the scope of 4mm to 8mm
It is interior, such as 6mm.
By the effect of the first control valve 621, the fluid in the first compressor 40 can be adjusted, specifically,
If the inner fluid liquid level of the first compressor 40 is higher than the first equal oilhole 41, opens first and control valve 621 until the first compressor
Fluid liquid level in 40 reaches the first equal oilhole 41.
Similarly, by the effect of the second control valve 622, the fluid in the second compressor 50 can be adjusted, is had
For body, if the inner fluid liquid level of the second compressor 50 is higher than the second equal oilhole 51, opens second and control valve 622 until second
Fluid liquid level in compressor 50 reaches the second equal oilhole 51.
It should be noted that the first equal oilhole 41 and the second equal oilhole 51 in the present embodiment are arranged at correspondence compressor
In optimum Working when fluid position at.
Further in conjunction with shown in Fig. 1, air-conditioning system also includes oil eliminator 90, the first filter 100, the first capillary 110
And oil return valve 120, wherein, oil eliminator 90 is arranged on the pipeline between the second compressor 50 and outdoor unit 10, and the one or four
Pipeline connection between 4th valve port 6114 and the compressor 50 of oil eliminator 90 and second of port valve 611, oil eliminator 90 goes out
Hydraulic fluid port is connected by the 3rd pipeline 130 with the oil return opening of gas-liquid separator 200；First filter 100, the first capillary 110 with
And oil return valve 120 is arranged on the 3rd pipeline 130, and it is sequentially arranged to the direction of gas-liquid separator 200 along oil eliminator 90.
Preferably, it is provided with the pipeline between the 4th valve port 6114 and oil eliminator 90 of the first four-way valve 611 unidirectional
Valve 140, prevents the fluid in oil eliminator 90 from flowing back.
Preferably, the 3rd control valve 150 is provided with the pipeline between check valve 140 and oil eliminator 90, is further had
Effect prevents the fluid in oil eliminator 90 from flowing back, and is easy to carry out the break-make of the pipeline between check valve 140 and oil eliminator 90
Control.
Preferably, the first compressor 40 to the first controls to be disposed with the second filter 210 on the pipeline between valve 621
With the second capillary 220；The 3rd filter is disposed with pipeline between second compressor the 50 to the first control valve 621
230 and three capillary 240.
In embodiment, air-conditioning system also includes the second four-way valve 160, the first valve port 161 of second four-way valve 160 with
The gas outlet connection of oil eliminator 90, the second valve port 162 of the second four-way valve 160 is connected with outdoor unit 10, the second four-way valve 160
The 3rd valve port 163 be connected with indoor set 30, the 4th valve port 164 of the second four-way valve 160 connects with the entrance of gas-liquid separator 200
Connect.
Preferably, throttling arrangement 20 includes the first segment being connected in turn on the pipeline between outdoor unit 10 and indoor set 30
The restricting element 22 of fluid element 21 and second, liquid storage is provided with the pipeline between the restricting element 22 of first throttle element 21 and second
Tank 170, the fluid reservoir 170 is connected by the 4th pipeline 180 with the air entry of the second compressor 50.
Adjusting means in the present embodiment also includes the 4th control valve 190, and the 4th control valve 190 is arranged on the 4th pipeline
On 180, wherein, when the first valve port 6111 of the first four-way valve 611 and the 4th valve port 6114 of the first four-way valve 611 are turned on, and
When second valve port 6112 of the first four-way valve 611 and the 3rd valve port 6113 of the first four-way valve 611 are turned on, the 3rd control valve 150
When being in closing with the 4th control valve 190, the isolated operation of the second compressor 50.
The course of work that the air-conditioning system of the present embodiment is specifically introduced below according to above-mentioned structure is as follows：
(1) first compressor 40 and the series operation of the second compressor 50
Annexation when the first compressor 40 and the second 50 series operation of compressor is as shown in Figure 2：First four-way valve 611
The first valve port 6111 and the second valve port 6112 turn on, the 3rd valve port 6113 and the 4th valve port 6114 of the first four-way valve 611 are led
Logical, as shown in the direction of arrow, now, the 3rd control valve 150 is closed, and the control control valve 190 of valve the 4th can be opened and can closed；Due to oil
Open circuit is represented from the solid lines of device 90, i.e., is circulated without refrigerant.Dotted line represents gaseous coolant stream, and fine line represents liquid or gas-liquid
Two phase refrigerants and the stream of oil return.
During work, refrigerant through gas-liquid separator 200 into one stage of compression is completed after the first compressor 40, subsequently into second
Compressor 50, now the 4th controls the closing control of valve 190 according to environment temperature and compressor frequency, when the 4th control valve 190
During unlatching, the gaseous coolant with fluid reservoir 170 is mixed into the second compressor 50 by the exhaust of the first compressor 40, realizes jet
Increasing enthalpy two-stage compression；High pressure refrigerant after being compressed through the second compressor 502 carries out refrigerant with lubricating oil into oil eliminator 90
Separate, when oil return valve 120 is opened, lubricating oil then can be by the first filter 100, the first capillary 110 and oil return valve 120
Into gas-liquid separator 200, hence into the first compressor 40 and the second compressor 50, it is ensured that the first compressor 40 and the second pressure
Contracting machine 50 will not because oil starvation and caused by abrasion etc..And with lubricating oil separation after high pressure gaseous refrigerant then by the second four-way
Valve 160 gets in machine 30 or outdoor unit 10.
A (), when the first compressor 40 and the cascade refrigeration of the second compressor 50 are run, high pressure gaseous refrigerant enters first
Enter outdoor unit 10 and be condensed into high-pressure liquid, then press gas-liquid mixed in being formed after first throttle element 21 carries out one-level throttling
The refrigerant of state, then refrigerant enters fluid reservoir 170, and the separation of gas-liquid two-phase is carried out in fluid reservoir 170, the gaseous state after separation
The exhaust of refrigerant and the first compressor 40 enters the air entry of the second compressor 50, and the liquid refrigerants after separation is by the second throttling
Element 22 turns into low-pressure low-temperature refrigerant after carrying out two-step throttle, heat absorption evaporation is carried out subsequently into indoor set 30, after the completion of evaporation
Into gas-liquid separator 200 subsequently into the first compressor 40 air entry, so as to complete whole air injection enthalpy-increasing two-stage compression system
SAPMAC method.
B (), when the first compressor 40 and the series connection heating operation of the second compressor 50, high pressure gaseous refrigerant enters first
Enter indoor set 30 and be condensed into high-pressure liquid, gas-liquid mixed state is then formed after the second restricting element 22 carries out one-level throttling
Middle pressure refrigerant, then refrigerant enters fluid reservoir 170, and the separation of gas-liquid two-phase is carried out in fluid reservoir 170, the gaseous state after separation
The exhaust of refrigerant and the first compressor 40 enters the air entry of the second compressor 50, and the liquid refrigerants after separation is by first throttle
Element 21 turns into low-pressure low-temperature refrigerant after carrying out two-step throttle, heat absorption evaporation is carried out subsequently into outdoor unit 10, after the completion of evaporation
Into gas-liquid separator 200 subsequently into the first compressor 40 air entry, so as to complete whole air injection enthalpy-increasing two-stage compression system
SAPMAC method.During series operation, when the 4th control valve 190 is closed, then the exhaust of the first compressor 40 is directly entered the second compressor
50 air-breathing, centre will not mix with the refrigerant in fluid reservoir 170, so as to enthalpy-increasing effect can not be realized.
(2) first compressors 40 and the parallel running of the second compressor 50
System is as shown in Figure 3 when the first compressor 40 and the second compressor parallel：First valve port of the first four-way valve 611
6111 and the 4th valve port 6114 turn on, the second valve port 6112 of the first four-way valve 611 and the 3rd valve port 6113 are turned on, such as arrow side
To conducting, the 3rd control valve 150 is opened, and the control control valve 190 of valve the 4th is closed.Heavy line lines represent open circuit, i.e., without refrigerant
Circulation.The first control valve 621 and the second control valve 622 can be now opened, two equal oil of compressor are carried out.Dotted line represents gas
State refrigerant flow, solid line represents liquid or gas-liquid two-phase state refrigerant and the stream of oil return.
During work, refrigerant flows through the suction for entering the first compressor 40 and the second compressor 50 after gas-liquid separator 200 simultaneously
Gas port, after overcompression carry out refrigerant into oil eliminator 90 separates with lubricating oil, when oil return valve 120 is opened, lubricating oil
Then gas-liquid separator 200 can be entered by the first filter 100, the first capillary 110 and oil return valve 120, hence into the
One compressor 40 and the second compressor 50, it is ensured that the first compressor 40 and the second compressor 50 will not because oil starvation and caused by wear and tear
Deng.And then get in machine 30 or outdoor unit by the second four-way valve 160 with the high pressure gaseous refrigerant after lubricating oil separation
10 are heated or refrigerating operaton.Detailed process and the first compressor 40 and the series operation of the second compressor 50, herein no longer
Repeat.
The isolated operation of (3) second compressor 50
When extraneous ability need is low, system load hour, system is as shown in Figure 4 during the second 50 isolated operation of compressor：The
First valve port 6111 of one four-way valve 611 and the 4th valve port 6114 are turned on, the second valve port 6112 and the 3rd of the first four-way valve 611
Valve port 6113 is turned on, such as direction of arrow conducting, and the 3rd control valve 150 and the control control valve 190 of valve the 4th are all closed.Dotted line is represented
Gaseous coolant stream, fine line represents liquid or gas-liquid two-phase state refrigerant and the stream of oil return, and heavy line represents open circuit, i.e., without
Refrigerant circulates.Now the first compressor 40 stops, and refrigerant flows through the air-breathing for entering the second compressor 50 after gas-liquid separator 200
Mouthful, the four-way valve 160 of oil eliminator 90 and second is passed into after the completion of compression, carried out subsequently into indoor set 30 or outdoor unit 10
Heat or refrigerating operaton.Detailed process and the first compressor 40 and the series operation of the second compressor 50, here is omitted.
It is described above the first two feature of the system：Two-stage Compression and single stage compress switch and freeze and heat cuts
Change.
When there is a compressor rich oil, it is necessary to the first compressor 40 and second during the situation of another compressor oil starvation
The inner fluid of compressor 50 is adjusted, this application provides a kind of air conditioner system control method, the air conditioner system control method by
Above-mentioned air-conditioning system is realized, including step：Detecting step：Detect the first compressor 40 and or the second compressor 50 in oil
Whether liquid reaches poised state；Judge to perform step：If the first compressor 40 and or the second compressor 50 in fluid do not reach
To poised state, then adjusting means is adjusted, make the first compressor 40 and the second compressor 50 in parallel connection until the first pressure
The inner fluid of 40 and second compressor of contracting machine 50 reaches balance.
Specifically, in judging to perform step, the first compressor 40 and the second compressor 50 are switched to parallel running
Under pattern, open first and control the control valve 622 of valve 621 and second, it is oily between two compressors.It should be noted that when the
When one compressor 40 and the second 50 series operation of compressor, because two Suck and exhaust pressures of compressor are different, it is impossible to realize two
Equal oil between individual compressor, the equal oil control between two compressors under parallel running mode, it is necessary to carry out.
It is shown in Figure 3, copper pipe is drawn from the first equal oilhole 41 of the first compressor 40 through the second filter 210, second
The control valve 621 of capillary 220, first is connected to the inlet pipe of gas-liquid separator 200.Second filter 210 is used to prevent the second capillary
Pipe 220 is blocked, and the second capillary 220 is used to carry out reducing pressure by regulating flow to tube fluid；From the second compressor 50 second is oily
Draw copper pipe at hole 51 and be connected to entering for gas-liquid separator 200 through the 3rd filter 230, the control valve 622 of three capillary 240, second
Pipe.Second filter 210 and the 3rd filter 230 are respectively used to prevent the second capillary 220 and three capillary 240 to be blocked
Plug, the second capillary 220 and three capillary 240 are used to carry out reducing pressure by regulating flow to tube fluid.
Due to the first compressor 40 in the process of running and the discharge chamber of the second compressor 50 be high pressure, and gas-liquid separator
It is then low-pressure state in 200, therefore when the first control control valve 622 of valve 621 and second is opened, the discharge chamber of the first compressor 40
Lubricating oil can pass through the second filter 210, the second capillary 220 and the first control valve 621 and flow to gas-liquid separator
200, the lubricating oil of the discharge chamber of the second compressor 50 can pass through the 3rd filter 230, three capillary 240 and second and control
Valve processed 622 flows to gas-liquid separator 200.
In judging to perform step, the first four-way valve 611 is adjusted, make the first valve port 6111 of the first four-way valve 611 and the
Second valve port 6112 of one four-way valve 611 connects, and the first four-way valve 611 the 3rd valve port 6113 and the first four-way valve 611
When 4th valve port 6114 is connected, the first compressor 40 and the second compressor 50 are in series connection；Make the of the first four-way valve 611
One valve port 6111 is connected with the 4th valve port 6114 of the first four-way valve 611, and the second valve port 6112 of the first four-way valve 611 and
When 3rd valve port 6113 of one four-way valve 611 is connected, the first compressor 40 and the second compressor 50 are in parallel connection.
Preferably, in judging to perform step, if the inner fluid liquid level of the first compressor 40 is higher than the first equal oilhole 41,
Open first and control valve 621 until the fluid liquid level in the first compressor 40 reaches the first equal oilhole 41；If the second compressor
50 inner fluid liquid levels are higher than the second equal oilhole 51, then open second and control valve 622 up to the fluid liquid level in the second compressor 50
Reach the second equal oilhole 51.
Using Multi-compressor parallel multi-connected machine due to capacity it is larger, it is more long that the place of application generally requires connecting tube, and
There is certain drop high in indoor set 30 and outdoor unit 10, such case more likely makes compressor there is the possibility of oil starvation.Therefore it is first
First the first compressor 40 and the lubricating oil of the interior addition of the second compressor 50 will enough ensure that multiple compressors are running any frequency
Shi Douneng is in flat oil condition (oil level near equal oilhole, just within 10mm).
Rich oil：Oil level in first compressor 40 is higher than the oil level in the first equal oilhole 41 or the second compressor 50 higher than the
Two equal oilholes 51
Oil starvation：Oil level in first compressor 40 is less than the oil level in the first equal oilhole 41 or the second compressor 50 less than the
Two equal oilholes 51；
Flat oil：The oil level of oil level in first compressor 40 near the first equal oilhole 41 or in the second compressor 50 is
Two equal oilholes 51, just within 10mm；
Oil level is balanced：After multiple compressors run a period of time simultaneously, the oil of the first compressor 40 and the second compressor 50
Potential energy is enough always maintained at stable state, the level height of the first compressor 40 and the second compressor 50 all near equal oilhole, all
State in flat oil；
During work, the first compressor 40 and the second compressor 50 all need operation, then open two compressors and its corresponding
The 3rd control control valve 190 of valve 150 and the 4th.Due to the difference of the initial oil level, running frequency and oil drain quantity of two compressors,
May there is a compressor oil starvation, the phenomenon of another compressor rich oil.If the rich oil of the first compressor 40, its operation oil level
Higher than the position of the first equal oilhole 41, because the pressure of compressor discharge chamber in running is higher than the pressure in gas-liquid separator,
Therefore during lubricating oil can be passed through the row of the first equal oilhole 41 to gas-liquid separator 200 by first compressor 40 of rich oil so that rich oil
The oil level reduction of the first compressor 40；And the oil starvation of the second compressor 50, due to the oil starvation of the second compressor 50, its oil level is less than second
Lubricating oil will not be passed through the row of the second equal oilhole 51 to gas-liquid separator 200 by the equal position of oilhole 51, the second compressor 50；While two
Compressor all can obtain lubricating oil by air-breathing from gas-liquid separator 200 in the process of running, so the second pressure of oil starvation
The oil level of contracting machine 50 can rise.Therefore, the compressor oil level of rich oil can decline in this cyclic process, the compressor oil level meeting of oil starvation
Rise, until the oil level of two compressors reaches balance, two compressors are all in flat oil condition.
According to the above embodiments it is recognised that on the one hand air-conditioning system of the invention can realize two strings of compressor
Connection and parallel connection, and freeze and heat switching, on the other hand, devise a kind of compressor oil equalization method, it is ensured that compressor will not
Service life or running efficiency are influenceed because of oil starvation or rich oil, it is ensured that the long-term reliability of compressor.And, this system
Broader refrigerating operaton and heating operation scope and operational efficiency can also be realized, while improving heating capacity and system under ultralow temperature
Refrigerating capacity and operational efficiency when freezing when the thermal efficiency and superhigh temperature.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (13)
1. a kind of air-conditioning system, it is characterised in that including the outdoor unit (10), the throttling arrangement that are successively set on the same circuit
(20), indoor set (30), the first compressor (40) and the second compressor (50), the air-conditioning system also include：
Adjusting means, the adjusting means is used for the company between first compressor (40) and second compressor (50)
The relation of connecing is adjusted, and first compressor (40) and second compressor (50) is switched between series connection and parallel connection,
Or make second compressor (50) isolated operation, and in first compressor (40) and second compressor (50)
Fluid is adjusted；
The adjusting means includes：Connection in series-parallel adjustment portion (61), the connection in series-parallel adjustment portion (61) is for making first compression
Machine (40) and second compressor (50) switch between series connection and parallel connection；Fluid adjustment portion (62), the fluid adjustment portion
(62) for being adjusted to the fluid in first compressor (40) and second compressor (50)；
The air-conditioning system also includes：Gas-liquid separator (200), first compressor (40) and second compressor (50)
It is connected with the gas-liquid separator (200), the first equal oilhole (41), described first is provided with first compressor (40)
Equal oilhole (41) is connected by the first pipeline (70) with the oil return opening of the gas-liquid separator (200), second compressor
(50) the second equal oilhole (51) is provided with, the second equal oilhole (51) is by second pipe (80) and the gas-liquid separator
(200) oil return opening connection, the fluid adjustment portion (62) includes：First control valve (621), first control valve (621)
It is arranged on first pipeline (70) to control the break-make of first pipeline (70)；Second control valve (622), described second
Control valve (622) is arranged on the second pipe (80) to control the break-make of the second pipe (80).
2. air-conditioning system according to claim 1, it is characterised in that the air-conditioning system also includes：Gas-liquid separator
(200), first compressor (40) and second compressor (50) are connected with the gas-liquid separator (200), described
The air entry of the first compressor (40) is connected with the gas outlet of the gas-liquid separator (200), the connection in series-parallel adjustment portion (61)
Including：
First four-way valve (611), first valve port (6111) of first four-way valve (611) and first compressor (40)
Gas outlet connects, and second valve port (6112) of first four-way valve (611) connects with the air entry of second compressor (50)
Connect, the 3rd valve port (6113) of first four-way valve (611) is connected with the gas outlet of the gas-liquid separator (200), described
4th valve port (6114) of the first four-way valve (611) and the pipeline between second compressor (50) and the outdoor unit (10)
Connection, wherein,
First valve port (6111) of first four-way valve (611) and second valve port (6112) of first four-way valve (611)
Conducting, and first four-way valve (611) the 3rd valve port (6113) and the 4th valve port of first four-way valve (611)
(6114) when turning on, first compressor (40) and second compressor (50) are in series connection；
First valve port (6111) of first four-way valve (611) and the 4th valve port (6114) of first four-way valve (611)
Conducting, and first four-way valve (611) the second valve port (6112) and the 3rd valve port of first four-way valve (611)
(6113) when turning on, first compressor (40) and second compressor (50) are in parallel connection.
3. air-conditioning system according to claim 2, it is characterised in that the air-conditioning system also include oil eliminator (90),
First filter (100), the first capillary (110) and oil return valve (120), wherein,
The oil eliminator (90) is arranged on the pipeline between second compressor (50) and the outdoor unit (10), described
4th valve port (6114) of the first four-way valve (611) and the pipe between the oil eliminator (90) and second compressor (50)
Road connects, and the oil-out of the oil eliminator (90) passes through the oil return opening of the 3rd pipeline (130) and the gas-liquid separator (200)
Connection；
First filter (100), first capillary (110) and the oil return valve (120) are arranged at described
On three pipelines (130), and it is sequentially arranged to the direction of the gas-liquid separator (200) along the oil eliminator (90).
4. air-conditioning system according to claim 3, it is characterised in that the 4th valve port of first four-way valve (611)
(6114) it is provided with check valve (140) with the pipeline between the oil eliminator (90).
5. air-conditioning system according to claim 4, it is characterised in that the check valve (140) and the oil eliminator
(90) the 3rd control valve (150) is provided with the pipeline between.
6. air-conditioning system according to claim 1, it is characterised in that first compressor (40) to the described first control
The second filter (210) and the second capillary (220) are disposed with pipeline between valve (621)；Second compressor
(50) to being disposed with the 3rd filter (230) and three capillary on the pipeline between the described second control valve (622)
(240)。
7. air-conditioning system according to claim 3, it is characterised in that the air-conditioning system also includes the second four-way valve
(160), first valve port (161) of second four-way valve (160) is connected with the gas outlet of the oil eliminator (90), and described
Second valve port (162) of two four-way valves (160) is connected with the outdoor unit (10), the 3rd valve of second four-way valve (160)
Mouthful (163) are connected with the indoor set (30), the 4th valve port (164) of second four-way valve (160) and the gas-liquid separation
The entrance connection of device (200).
8. air-conditioning system according to claim 5, it is characterised in that the throttling arrangement (20) is including being connected in turn
The first throttle element (21) and the second restricting element (22) on the pipeline between outdoor unit (10) and the indoor set (30) are stated,
Fluid reservoir (170) is provided with pipeline between the first throttle element (21) and second restricting element (22), it is described
Fluid reservoir (170) is connected by the 4th pipeline (180) with the air entry of second compressor (50)；
The adjusting means also includes the 4th control valve (190), and the 4th control valve (190) is arranged on the 4th pipeline
(180) on, wherein,
First valve port (6111) of first four-way valve (611) and the 4th valve port (6114) of first four-way valve (611)
Conducting, and first four-way valve (611) the second valve port (6112) and the 3rd valve port of first four-way valve (611)
(6113) when turning on, in when closing, described second compresses for the 3rd control valve (150) and the 4th control valve (190)
Machine (50) isolated operation.
9. air-conditioning system according to claim 1, it is characterised in that the first equal oilhole (41) to the described first compression
The distance of the exhaust valve plate of machine (40) be the described first equal oilhole (41) to the minimum oil level of first compressor (50) at away from
From 1/2；
The distance of exhaust valve plate of the second equal oilhole (51) to second compressor (50) is the described second equal oilhole
(51) to the minimum oil level of second compressor (50) distance 1/2.
10. air-conditioning system according to claim 9, it is characterised in that the first equal oilhole (41) and described second equal
The aperture of oilhole (51) is in the range of 4mm to 8mm.
11. a kind of control methods of air-conditioning system, it is characterised in that the air conditioner system control method is by claim 1 to 10
Any one of air-conditioning system realize, including：
Detecting step：Detect first compressor (40) and or second compressor (50) in fluid whether reach it is flat
Weighing apparatus state；
Judge to perform step：If first compressor (40) and or second compressor (50) in fluid be not up to
Poised state, then adjust the adjusting means, makes first compressor (40) and second compressor (50) in parallel connection
State is until first compressor (40) and second compressor (50) inner fluid reach balance.
The control method of 12. air-conditioning systems according to claim 11, it is characterised in that judge to perform step described
In, the first four-way valve (611) is adjusted, make first valve port (6111) and first four-way valve of first four-way valve (611)
(611) the second valve port (6112) connection, and first four-way valve (611) the 3rd valve port (6113) and first four-way
When 4th valve port (6114) of valve (611) is connected, first compressor (40) and second compressor (50) are in series connection
State；
The first four-way valve (611) is adjusted, makes first valve port (6111) and first four-way valve of first four-way valve (611)
(611) the 4th valve port (6114) conducting, and first four-way valve (611) the second valve port (6112) and first four-way
When 3rd valve port (6113) of valve (611) is turned on, first compressor (40) and second compressor (50) are in parallel connection
State.
The control method of 13. air-conditioning systems according to claim 12, it is characterised in that judge to perform step described
In,
If the first compressor (40) inner fluid liquid level is higher than the first equal oilhole (41), opens first and control valve (621)
Until the fluid in first compressor (40) reaches poised state；
If the second compressor (50) inner fluid liquid level is higher than the second equal oilhole (51), opens second and control valve (622)
Until the fluid in second compressor (50) reaches balance.
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| CN201510275839.0A CN104848599B (en) | 2015-05-26 | 2015-05-26 | Air-conditioning system and its control method |
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| WO2018137125A1 (en) * | 2017-01-24 | 2018-08-02 | 徐生恒 | High-efficiency energy-saving air-energy dual-machine heat pump air conditioning system |
| KR102581680B1 (en) | 2017-02-01 | 2023-09-22 | 엘지전자 주식회사 | Outdoor unit of an air conditioner |
| CN108036554A (en) * | 2018-01-05 | 2018-05-15 | 珠海格力电器股份有限公司 | The idle call circulatory system, air-conditioning and air conditioning control method |
| CN108181124B (en) * | 2018-01-31 | 2023-05-05 | 深圳市艾特网能技术有限公司 | Air conditioning unit joint debugging tool system and control method thereof |
| CN111256379A (en) * | 2018-11-30 | 2020-06-09 | 广东美芝精密制造有限公司 | Refrigerating device |
| JP6970363B1 (en) * | 2020-09-30 | 2021-11-24 | ダイキン工業株式会社 | Compressor |
| CN114234487A (en) * | 2021-12-23 | 2022-03-25 | 中电建路桥集团有限公司 | Carbon dioxide variable circulating water source heat pump and hot water unit |
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| JPH0697123B2 (en) * | 1986-04-21 | 1994-11-30 | 三洋電機株式会社 | Refrigeration equipment |
| CN201297801Y (en) * | 2008-10-17 | 2009-08-26 | 广东美的电器股份有限公司 | Connecting structure of double compressors |
| CN102278837B (en) * | 2011-01-28 | 2013-08-14 | 大连三洋压缩机有限公司 | Oil equalization system of compressor units |
| CN202101340U (en) * | 2011-05-24 | 2012-01-04 | 宁波奥克斯电气有限公司 | Heat pump screw-type compression multi-connection central air conditioner device |
| CN104501437A (en) * | 2014-11-25 | 2015-04-08 | 珠海格力电器股份有限公司 | Heat pump system and operation method thereof |
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