CN103982951B - Multi-gang air-conditioner off-premises station and control method thereof - Google Patents
Multi-gang air-conditioner off-premises station and control method thereof Download PDFInfo
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- CN103982951B CN103982951B CN201410188670.0A CN201410188670A CN103982951B CN 103982951 B CN103982951 B CN 103982951B CN 201410188670 A CN201410188670 A CN 201410188670A CN 103982951 B CN103982951 B CN 103982951B
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- 238000010438 heat treatment Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 abstract description 16
- 239000003921 oil Substances 0.000 description 199
- 239000002826 coolant Substances 0.000 description 25
- 239000012530 fluid Substances 0.000 description 17
- 238000005057 refrigeration Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000007689 inspection Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 239000010725 compressor oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
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Abstract
The invention provides a kind of multi-gang air-conditioner off-premises station and control method thereof.Wherein, multi-gang air-conditioner off-premises station includes: be respectively arranged with the first equal oilhole and the second equal oilhole on varying capacity low-pressure cavity compressor, the first check valve and constant volume low-pressure cavity compressor, varying capacity low-pressure cavity compressor and constant volume low-pressure cavity compressor；The import of the first check valve is connected by the equal oilhole of the second oil circuit and second, and outlet is connected by the equal oilhole of the first oil circuit and first；First check valve is parallel with first throttle valve, and the first oil circuit is provided with the first temperature-detecting device for detecting temperature；The second temperature-detecting device for detecting temperature it is provided with on second oil circuit；Controller receives the detected value of the first temperature-detecting device and the detection of the second temperature-detecting device calculating temperature difference, judges whether to all oil operations according to the temperature difference.The technical scheme that the present invention provides, it is possible to be effectively prevented from compressor and the too low damage problem caused of oil level occurs.
Description
Technical field
The present invention relates to household appliance technical field, more specifically, relate to a kind of multi-gang air-conditioner off-premises station and
Control method.
Background technology
Multi-online air-conditioning system is made up of some air-conditioning equipments, it is possible to realize multiple stage off-premises station and multiple stage indoor set
Independent assortment.The capacity of one multiple on-line system generally has ten even more than tens, multiple on-line system
Pipeline is complicated, has multiple compressors inside outdoor unit modules, during load difference, and the operating feelings of every compressor
Condition is the most different, and the presumable high loaded process of compressor in system, have is inoperative, in this feelings
Easily occurring under condition that the distribution of each compressor chamber oil is uneven, the possible lubricating oil of some compressors is not enough, has
Compressor may lubricating oil too much, the most easily cause the damage of compressor, be especially provided with multiple low
The multi-gang air-conditioner off-premises station of pressure cavity compressor, when low-pressure cavity compressor output imbalance in parallel, each
Pressure within low-pressure cavity compressor also differs, and oil can be low toward pressure from the low-pressure cavity compressor that pressure is high
Low-pressure cavity compressor offsets, if the oil within low-pressure cavity compressor is less than Safe Levels, will easily cause low
The damage of pressure cavity compressor.
Summary of the invention
It is contemplated that at least solve one of technical problem present in prior art.
To this end, it is an advantage of the invention to provide one can effectively ensure that low-pressure cavity compressor it
Between oil partition equilibrium multi-gang air-conditioner off-premises station.
It is a further object of the invention to provide the control method of a kind of multi-gang air-conditioner off-premises station.
For achieving the above object, the invention provides a kind of multi-gang air-conditioner off-premises station, including: transfiguration
Amount low-pressure cavity compressor, described varying capacity low-pressure cavity compressor is provided with the first equal oilhole；Constant volume
Low-pressure cavity compressor, described constant volume low-pressure cavity compressor is provided with the second equal oilhole；First is unidirectional
Valve, the import of described first check valve is connected with the described second equal oilhole by the second oil circuit, and outlet is passed through
First oil circuit is connected with the described first equal oilhole；First throttle valve, the first end of described first throttle valve
Mouth is connected with described first oil circuit, and the second port is connected with described second oil circuit；First temperature inspection
Surveying device, described first temperature-detecting device is arranged on described first oil circuit, is used for detecting described the
The temperature of one oil circuit, and export the first temperature value；Second temperature-detecting device, described second temperature inspection
Survey device to be arranged on described second oil circuit, for detecting the temperature of described second oil circuit, and export the
Two temperature values；And controller, described controller receives described first temperature value and described second temperature value
And calculating temperature difference, judge whether to all oil operations according to the described temperature difference.
The multi-gang air-conditioner off-premises station that the present invention provides has constant volume low-pressure cavity compressor and varying capacity is low
Pressure cavity compressor, variable conpacitance compressor and constant volume compressor are provided with equal oilhole, in constant volume low pressure chamber
First check valve and first throttle are set between compressor and the equal oilhole of varying capacity low-pressure cavity compressor
Valve, the direction of the first check valve is from constant volume compressor to variable conpacitance compressor, first throttle valve with
First check valve is in parallel, respectively arranges a temperature-detecting device in the both sides of first throttle valve simultaneously, multi-joint
Air conditioner off-premises station is opened when running, and in running, two temperatures detection device detects the first oil always
Road and the temperature of the second oil circuit calculating temperature difference, due to refrigeration oil temperature phase before and after first throttle valve
Difference is less, and coolant will produce the bigger temperature difference before and after first throttle valve, therefore, by calculating
What the temperature difference circulated in may determine that the first oil circuit and the second oil circuit is coolant or fluid, thus judgement is
No needs performs all oil operations, with ensure the oil level of two low-pressure cavity compressors safe operation oil level it
On, thus efficiently avoid the damage that the oil within two low-pressure cavity compressors causes less than Safe Levels
Bad problem, and then ensure that the service life of two low-pressure cavity compressors.
It addition, also have the most attached according to the multi-gang air-conditioner off-premises station of the above embodiment of the present invention offer
Add technical characteristic:
According to one embodiment of present invention, described first temperature-detecting device and described second temperature inspection
Survey device and be temperature sensor.
Temperature sensor can direct feeling the first oil circuit and the temperature of the second oil circuit, and will impression temperature
Degree is converted into the temperature value output that controller needs, the first temperature-detecting device and the second temperature detection dress
Putting and all use temperature sensor, temperature sensor can be made whether to perform all oil operations for controller
Judge to provide data foundation accurately, thus ensure that the low-pressure cavity compressor of multi-gang air-conditioner off-premises station
Service life.
According to one embodiment of present invention, described temperature sensor is critesistor.
Critesistor has the advantages such as volume is little, highly sensitive, good stability, easy machine-shaping, uses heat
Quick resistance detects the first oil circuit and the temperature of the second oil circuit as temperature sensor, it is possible to effectively ensure detection
The accuracy of result, thus be effectively guaranteed multi-gang air-conditioner off-premises station and judging whether to all oil operations
Accuracy.
According to one embodiment of present invention, described first throttle valve be capillary tube or electric expansion valve or
Person's heating power expansion valve.
Capillary tube or electric expansion valve or heating power expansion valve all have good throttling action, wherein, electronics
The aperture of expansion valve and heating power expansion valve can degree of supercooling as required control, and the production cost of capillary tube
Low, assemble simple and convenient.
According to one embodiment of present invention, the described first equal oilhole compresses higher than described varying capacity low pressure chamber
The Safe Levels of machine；Described second equal oilhole is higher than the Safe Levels of described constant volume low-pressure cavity compressor.
When the pressure of varying capacity low-pressure cavity compressor is more than the pressure of constant volume low-pressure cavity compressor, varying capacity
Fluid in low-pressure cavity compressor passes through the first equal oilhole, through the first oil circuit, first throttle valve, the second oil circuit
Constant volume low-pressure cavity compressor is flowed into, in order to avoid when in varying capacity low-pressure cavity compressor by the second equal oilhole
Fluid all flow into constant volume low-pressure cavity compressor, cause in varying capacity low-pressure cavity compressor without fluid profit
Sliding, cause the problem that varying capacity low-pressure cavity compressor damages, design the first equal oilhole is higher than varying capacity low pressure chamber
The Safe Levels of compressor, equally, when the pressure of varying capacity low-pressure cavity compressor is less than constant volume low pressure chamber pressure
During the pressure of contracting machine, the fluid in constant volume low-pressure cavity compressor passes through the second equal oilhole, through the second oil circuit,
First check valve, the first oil circuit flow into varying capacity low-pressure cavity compressor by the first equal oilhole, in order to avoid working as
Fluid in constant volume low-pressure cavity compressor all flows into varying capacity low-pressure cavity compressor, causes varying capacity low pressure
Without oil lubrication in cavity compressor, cause the problem that constant volume low-pressure cavity compressor damages, design second all oil
Hole is higher than the Safe Levels of varying capacity low-pressure cavity compressor.
According to one embodiment of present invention, described multi-gang air-conditioner off-premises station also includes: gas-liquid separator,
The outlet of described gas-liquid separator is low with the gas returning port of described varying capacity low-pressure cavity compressor and described constant volume
The gas returning port of pressure cavity compressor is connected；First oil eliminator, the import of described first oil eliminator is with described
The air vent of varying capacity low-pressure cavity compressor is connected；And second oil eliminator, described second oil eliminator
Import is connected with the air vent of described constant volume low-pressure cavity compressor；The oil return opening of described first oil eliminator
By second throttle and described constant volume low pressure chamber pressure after oil return opening parallel connection with described second oil eliminator
Contracting machine is connected.
In order to avoid liquid refrigerants enters in varying capacity low-pressure cavity compressor and constant volume low-pressure cavity compressor
Cause liquid hammer problem, design the outlet of gas-liquid separator and the gas returning port of varying capacity low-pressure cavity compressor and determine
Capacity low pressure cavity compressor gas returning port is connected, low to ensure varying capacity low-pressure cavity compressor and constant volume
The service life of pressure cavity compressor；At multi-gang air-conditioner off-premises station in running, varying capacity low pressure
Oil in cavity compressor and constant volume low-pressure cavity compressor can be discharged along with coolant, in order to avoid fluid wave
Take, arrange the first oil-liquid separator be connected with the air vent of varying capacity low-pressure cavity compressor, the second fluid
Separator is connected with the air vent of constant volume low-pressure cavity compressor, and the oil return opening of the first oil eliminator and
It is connected with constant volume low-pressure cavity compressor by second throttle, i.e. after the oil return opening parallel connection of two oil eliminators
After oil in low-pressure cavity compressor discharges compressor along with coolant, separate in oil eliminator and be deposited on oil
Constant volume piezometric is returned to by second throttle behind separator bottom, then the oil return opening junction bottom oil eliminator
Contracting machine, thus it is effectively improved the utilization rate of lubricating oil.
According to one embodiment of present invention, described multi-gang air-conditioner off-premises station also includes: the second check valve,
The import of described second check valve is connected with the air vent of described varying capacity low-pressure cavity compressor, and described second
The outlet of check valve is connected with the import of described first oil eliminator；And the 3rd check valve, the described 3rd is single
Air vent to the import of valve with described constant volume low-pressure cavity compressor is connected, going out of described 3rd check valve
Mouth is connected with the import of described second oil eliminator.
Second aspect present invention embodiment provides the control method of a kind of multi-gang air-conditioner off-premises station, uses
All oil between multiple low-pressure cavity compressors controls, and described multi-gang air-conditioner off-premises station is above-mentioned first aspect
The multi-gang air-conditioner off-premises station that any embodiment provides, the control method bag of described multi-gang air-conditioner off-premises station
Include following steps:
After receiving enabling signal, controller controls the first temperature-detecting device and detects the temperature of the first oil circuit
Value, and export the first temperature value, control the second temperature-detecting device simultaneously and detect the temperature value of the second oil circuit,
And export the second temperature value；
Described controller receives described first temperature value and described second temperature value, and carries out data process, root
All oil operations are judged whether to according to data processed result；
Wherein, data are processed as the temperature difference calculating described first temperature value with described second temperature value, when described
The temperature difference is more than or equal to preset temperature value, and when described difference is persistently extremely preset more than or equal to described preset temperature value
Time long, described controller sends and carries out all oil operational orders.
The control method of the multi-gang air-conditioner off-premises station that the present invention provides, in running, controller
Control two temperatures detection device and detect the first oil circuit and the temperature of the second oil circuit calculating temperature difference always, by
Less in refrigeration oil temperature difference before and after first throttle valve, and coolant is before and after first throttle valve
By producing the bigger temperature difference, by controller calculating temperature difference, and the temperature difference calculated is entered with preset value
Row compares, if the temperature difference more than preset value and continues to preset duration, controller judges according to comparative result
Whether perform all oil operations, with ensure the oil level of two low-pressure cavity compressors all safe operation oil level it
On, thus efficiently avoid the damage that the oil within two low-pressure cavity compressors causes less than Safe Levels
Bad problem, and then ensure that the service life of two low-pressure cavity compressors.
It addition, according to the above embodiment of the present invention provide multi-gang air-conditioner off-premises station control method also
There is following additional technical feature:
According to one embodiment of present invention, described preset temperature value is more than or equal to 5 DEG C.
Because refrigeration oil temperature difference before and after first throttle valve is less, and coolant is through first throttle valve
Front and back will produce the bigger temperature difference, design preset temperature value, more than or equal to 5 DEG C, efficiently avoid because of cold
Freeze all oil inaccurate problem of operation that the oil little temperature difference before and after first throttle valve causes.
According to one embodiment of present invention, described preset duration is more than or equal to 30 minutes.
Detection in order to avoid causing because being mixed with gaseous coolant in fluid is forbidden situation to occur, preset duration
More than or equal to 30 minutes, with guarantee circulation in the first oil circuit and the second oil circuit as coolant, thus ensure
The multi-gang air-conditioner off-premises station accuracy that all oil controls.
Additional aspect and the advantage of the present invention will be given in following description part, and part will be from following
Description in become obvious, or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage are from combining the accompanying drawings below description to embodiment
Will be apparent from easy to understand, wherein:
Fig. 1 is the partial structurtes schematic diagram according to the multi-gang air-conditioner off-premises station described in one embodiment of the invention；
Fig. 2 is the signal of the control method according to the multi-gang air-conditioner off-premises station described in one embodiment of the invention
Flow chart；
Fig. 3 be the multi-gang air-conditioner off-premises station shown in Fig. 2 control method in data process exemplary flow
Figure.
Wherein, in Fig. 1, corresponding relation between reference and component names is:
10 varying capacity low-pressure cavity compressors, 20 constant volume low-pressure cavity compressors, 31 first check valves, 32
Two check valves, 33 the 3rd check valves, 41 first throttle valves, 42 second throttle, 51 first temperature inspections
Survey device, 52 second temperature-detecting devices, 61 first oil eliminators, 62 second oil eliminators, 70 gas
Liquid/gas separator, 81 first oil circuits, 82 second oil circuits.
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, below in conjunction with attached
The present invention is further described in detail by figure and detailed description of the invention.It should be noted that not
In the case of conflict, the feature in embodiments herein and embodiment can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention, but,
The present invention can implement to use other to be different from mode described here, therefore, and the guarantor of the present invention
Scope of protecting is not limited by following public specific embodiment.
1 offer multi-gang air-conditioner off-premises station according to some embodiments of the invention is described with reference to the accompanying drawings.
As it is shown in figure 1, the multi-gang air-conditioner off-premises station that one embodiment of the invention provides, including: transfiguration
Amount low-pressure cavity compressor 10, constant volume low-pressure cavity compressor the 20, first check valve 31, first throttle
Valve the 41, first temperature-detecting device the 51, second temperature-detecting device 52 and controller.
Wherein, varying capacity low-pressure cavity compressor 10 is provided with the first equal oilhole, constant volume low pressure chamber pressure
The second equal oilhole it is provided with on contracting machine 20；The second oil circuit 82 and second is passed through in the import of the first check valve 31
All oilholes are connected, and outlet is connected with the first equal oilhole by the first oil circuit 81；First throttle valve 41
The first port and the first oil circuit 81 be connected, the second port and the second oil circuit 82 are connected；First
Temperature-detecting device 51 is arranged on the first oil circuit 81, for the temperature of detection the first oil circuit 81, and
Export the first temperature value；Second temperature-detecting device 52 is arranged on the second oil circuit 82, is used for detecting
The temperature of the second oil circuit 82, and export the second temperature value；Controller receives the first temperature value and the second temperature
Angle value calculating temperature difference, judge whether to all oil operations according to the temperature difference.
The multi-gang air-conditioner off-premises station that the present embodiment provides has constant volume low-pressure cavity compressor 20 and becomes
Capacity low pressure cavity compressor 10, variable conpacitance compressor and constant volume compressor are provided with equal oilhole, at constant volume
First is arranged unidirectional between amount low-pressure cavity compressor 20 and the equal oilhole of varying capacity low-pressure cavity compressor 10
Valve 31 and first throttle valve 41, the direction of the first check valve 31 is from constant volume compressor to varying capacity
Compressor, first throttle valve 41 is in parallel with the first check valve 31, simultaneously at the two of first throttle valve 41
Side respectively arranges a temperature-detecting device, and multi-gang air-conditioner off-premises station is opened when running, in running
Two temperatures detection device detects the first oil circuit 81 and the temperature of the second oil circuit 82 calculating temperature difference all the time,
Owing to refrigeration oil temperature difference before and after first throttle valve 41 is less, and coolant is through first throttle valve
By producing the bigger temperature difference before and after 41, therefore, may determine that the first oil circuit 81 He by calculating temperature difference
In second oil circuit 82, circulation is coolant or fluid, thus judges whether to need to perform all oil operations,
To ensure that the oil level of two low-pressure cavity compressors, on safe operation oil level, thus efficiently avoid
The damage problem that oil within two low-pressure cavity compressors causes less than Safe Levels, and then ensure that two
The service life of individual low-pressure cavity compressor.
Specifically, the first equal oilhole is higher than the Safe Levels of varying capacity low-pressure cavity compressor 10, and second is the most oily
Hole is higher than the Safe Levels of constant volume low-pressure cavity compressor 20；First throttle valve 41 is capillary tube or electronics
Expansion valve or heating power expansion valve.
When the pressure of varying capacity low-pressure cavity compressor 10 is more than the pressure of constant volume low-pressure cavity compressor 20,
Fluid in varying capacity low-pressure cavity compressor 10 passes through the first equal oilhole, through the first oil circuit 81, first throttle
Valve the 41, second oil circuit 82 flows into constant volume low-pressure cavity compressor 20 by the second equal oilhole, in order to avoid working as
Fluid in varying capacity low-pressure cavity compressor 10 all flows into constant volume low-pressure cavity compressor 20, causes transfiguration
Without oil lubrication in amount low-pressure cavity compressor 10, cause the problem that varying capacity low-pressure cavity compressor 10 damages,
Design the first equal oilhole is higher than the Safe Levels of varying capacity low-pressure cavity compressor 10, equally, when varying capacity is low
When the pressure of pressure cavity compressor 10 is less than the pressure of constant volume low-pressure cavity compressor 20, constant volume low pressure chamber pressure
Fluid in contracting machine 20 passes through the second equal oilhole, through second oil circuit the 82, first check valve the 31, first oil circuit
81 flow into varying capacity low-pressure cavity compressor 10 by the first equal oilhole, in order to avoid when constant volume low pressure chamber pressure
Fluid in contracting machine 20 all flows into varying capacity low-pressure cavity compressor 10, causes varying capacity low-pressure cavity compressor
Without oil lubrication in 10, cause the problem that constant volume low-pressure cavity compressor 20 damages, design the second equal oilhole
Safe Levels higher than varying capacity low-pressure cavity compressor 10；Capillary tube or electric expansion valve or heating power are swollen
Swollen valve all has good throttling action, and wherein, the aperture of electric expansion valve and heating power expansion valve can be as required
Degree of supercooling control, and the production cost of capillary tube is low, it is simple and convenient to assemble.
Preferably, multi-gang air-conditioner off-premises station also includes: gas-liquid separator the 70, first oil eliminator 61,
Second check valve the 32, second oil eliminator 62 and the 3rd check valve 33.
Wherein, the gas returning port and calmly of the outlet of gas-liquid separator 70 and varying capacity low-pressure cavity compressor 10
The gas returning port of capacity low pressure cavity compressor 20 is connected；The import of the second check valve 32 and varying capacity low pressure
The air vent of cavity compressor 10 is connected, the outlet of the second check valve 32 and entering of the first oil eliminator 61
Mouth is connected；The import of the 3rd check valve 33 is connected with the air vent of constant volume low-pressure cavity compressor 20,
The outlet of the 3rd check valve 33 is connected with the import of the second oil eliminator 62；First oil eliminator 61
Second throttle 42 is passed through low with constant volume after the oil return opening parallel connection of oil return opening and the second oil eliminator 62
Pressure cavity compressor 20 is connected.
In order to avoid liquid refrigerants enters varying capacity low-pressure cavity compressor 10 and the compression of constant volume low pressure chamber
Machine 20 causes liquid hammer problem, the outlet of design gas-liquid separator 70 and varying capacity low-pressure cavity compressor
The gas returning port of 10 is connected with constant volume low-pressure cavity compressor 20 gas returning port, to ensure varying capacity low pressure
Cavity compressor 10 and the service life of constant volume low-pressure cavity compressor 20；At multi-gang air-conditioner off-premises station
Oil in running, in varying capacity low-pressure cavity compressor 10 and constant volume low-pressure cavity compressor 20
Can discharge along with coolant, in order to avoid fluid is wasted, the first oil-liquid separator and varying capacity low pressure are set
The air vent of cavity compressor 10 is connected, the second oil-liquid separator and constant volume low-pressure cavity compressor 20
Air vent be connected, and the oil return opening of the first oil eliminator 61 and the oil return of the second oil eliminator 62
Be connected with constant volume low-pressure cavity compressor 20 by second throttle 42 after mouth parallel connection, i.e. low pressure chamber
After oil in compressor discharges compressor along with coolant, separate in oil eliminator and be deposited on oil point
From device bottom, then return to constant volume by second throttle 42 after the oil return opening junction bottom oil eliminator
Capacity compressor, thus it is effectively improved the utilization rate of lubricating oil.
Specifically, first throttle valve 41 is capillary tube or electric expansion valve or heating power expansion valve.
In a specific embodiment of the present embodiment, it is preferable that the first temperature-detecting device 51 and
Two temperature-detecting devices 52 are temperature sensor.
Temperature sensor can direct feeling the first oil circuit 81 and the temperature of the second oil circuit 82, and will sense
The temperature value that the temperature transition being subject to becomes controller to need exports, the first temperature-detecting device 51 and the second temperature
Degree detection device 52 all uses temperature sensor, and temperature sensor is that controller is made whether to perform equal oil
The judgement of operation provides data foundation accurately, thus ensure that the low pressure of multi-gang air-conditioner off-premises station
The service life of cavity compressor.
Specifically, described temperature sensor is critesistor.
Critesistor has the advantages such as volume is little, highly sensitive, good stability, easy machine-shaping, uses heat
Quick resistance detects the first oil circuit 81 and temperature of the second oil circuit 82 as temperature sensor, it is possible to effectively protect
The accuracy of card testing result, thus be effectively guaranteed multi-gang air-conditioner off-premises station and judging whether to all
The accuracy of oil operation.
As it is shown in figure 1, the operation principle of the multi-gang air-conditioner off-premises station of present invention offer is as follows:
The air vent of varying capacity low-pressure cavity compressor 10 and the air vent of constant volume low-pressure cavity compressor 20 respectively connect
One oil eliminator, in running, the oil in low-pressure cavity compressor can be discharged along with coolant, separating of oil
Device is separated and is deposited on oil eliminator bottom, then pass through back after the oil return opening junction bottom oil eliminator
Oil capillary tube (second throttle 42) returns to constant volume compressor.Meanwhile, varying capacity low-pressure cavity compressor
10 and constant volume low-pressure cavity compressor 20 be respectively equipped with the first equal oilhole and the second equal oilhole, two equal oilholes
Position is determined by low-pressure cavity compressor safe operation oil level, typically runs oil than low-pressure cavity compressor minimum safe
Position is high, arranges a check valve between the two equal oilholes of low-pressure cavity compressor, and direction is from constant volume low pressure chamber pressure
Contracting machine 20, to varying capacity low-pressure cavity compressor 10, terminates the most oily capillary tube (first throttle at check valve two
Valve 41), simultaneously the most each at oil return capillary tube adapter a temperature sensor is set, running detects always
The temperature of two temperature sensors calculating temperature difference Δ T.
When system is run with Smaller load, multi-gang air-conditioner off-premises station only opens a varying capacity low-pressure cavity compressor
10, constant volume low-pressure cavity compressor 20 is closed, the oil meeting in varying capacity low-pressure cavity compressor 10
Along with coolant is discharged, separate in the first oil eliminator 61 and be deposited on the first oil eliminator 61 bottom,
Oil return opening bottom the first oil eliminator 61 returns to constant volume low-pressure cavity compressor 20 again.Due to this system
Use is low-pressure cavity compressor, and the chamber pressure of the low-pressure cavity compressor of operation is the minimum of whole system
Pressure, therefore, under the effect of pressure reduction, the oil in constant volume low-pressure cavity compressor 20 by check valve from
All oilholes return in varying capacity low-pressure cavity compressor 10, it is ensured that run the oil mass requirement of compressor.
When system can need relatively big, need to run two compressors, when varying capacity low-pressure cavity compressor 10 simultaneously
When exporting less, depending on capacity low pressure cavity compressor 20 be with fixing output at full capacity, now, constant volume
Amount pressure within low-pressure cavity compressor 20 is lower than the pressure within varying capacity low-pressure cavity compressor 10, because of
This is under the effect of pressure reduction, and the oil in varying capacity low-pressure cavity compressor 10 can be by all oil capillary tubies (first
Choke valve 41) constantly taken away by constant volume low-pressure cavity compressor 20, when varying capacity low-pressure cavity compressor 10
When interior oil level is higher than equal oilhole, constant volume low-pressure cavity compressor 20 will be from varying capacity low-pressure cavity compressor 10
In take most of oil away, oil temperature difference T after the most oily capillary tube (first throttle valve 41) is less；When
When oil level in varying capacity low-pressure cavity compressor 10 is less than equal oilhole, constant volume low-pressure cavity compressor 20 will be from
Taking major part coolant in varying capacity low-pressure cavity compressor 10 away, coolant is through all oil capillary tube (first throttles
Valve 41) reducing pressure by regulating flow afterwards, now detection temperature difference T is bigger, it is determined that for varying capacity low-pressure cavity compressor 10
Oil level is less than equal oilhole, after running a period of time T, stops constant volume low-pressure cavity compressor 20, now
The pressure of varying capacity low-pressure cavity compressor 10 cavity is less than the chamber pressure of constant volume low-pressure cavity compressor 20,
Under the effect of pressure reduction, the oil in constant volume low-pressure cavity compressor 20 is returned from the second equal oilhole by check valve
In varying capacity low-pressure cavity compressor 10, it is ensured that the oil mass requirement of variable conpacitance compressor.
As depicted in figs. 1 and 2, the control of the multi-gang air-conditioner off-premises station that another embodiment of the present invention provides
Method processed, all oil between multiple low-pressure cavity compressors controls, and multi-gang air-conditioner off-premises station is above-mentioned
Any embodiment provide multi-gang air-conditioner off-premises station, the control method of multi-gang air-conditioner off-premises station include with
Lower step:
Step 202, after receiving enabling signal, controller controls the first temperature-detecting device 51 and detects
The temperature value of one oil circuit 81, and export the first temperature value, control the second temperature-detecting device 52 simultaneously and detect
The temperature value of the second oil circuit 82, and export the second temperature value；
Step 204, controller receives the first temperature value and the second temperature value, and carries out data process, according to
Data processed result judges whether to all oil operations；
Wherein, as it is shown on figure 3, data are processed as calculating described first temperature value and described second temperature value
The temperature difference, when the described temperature difference is more than or equal to preset temperature value, and difference is persistently more than or equal to preset temperature value in advance
If during duration, controller sends and carries out all oil operational orders.
The control method of the multi-gang air-conditioner off-premises station that the present embodiment provides, in running, controls
Device controls two temperatures detection device and detects the first oil circuit 81 and the temperature of the second oil circuit 82 always and calculate
The temperature difference, owing to refrigeration oil temperature difference before and after first throttle valve 41 is less, and coolant is through first
By producing the bigger temperature difference before and after choke valve 41, by controller calculating temperature difference, and the temperature that will calculate
Difference compares with preset value, if the temperature difference is more than preset value and persistently to preset duration, controller according to
Comparative result judges whether to perform all oil operations, to ensure that the oil level of two low-pressure cavity compressors is all in peace
On row oil level for the national games, thus efficiently avoid the oil within two low-pressure cavity compressors less than safety
The damage problem that oil level causes, and then ensure that the service life of two low-pressure cavity compressors.
Specifically, preset temperature value is more than or equal to 5 DEG C, and preset duration is more than or equal to 30 minutes.
Because refrigeration oil temperature difference before and after first throttle valve 41 is less, and coolant is through first throttle
To produce the bigger temperature difference before and after valve 41, design preset temperature value, more than or equal to 5 DEG C, efficiently avoid
The all oil caused because of the refrigeration oil little temperature difference before and after first throttle valve 41 operates inaccurate problem；
Detection in order to avoid causing because being mixed with gaseous coolant in fluid is forbidden situation to occur, and preset duration is more than
Equal to 30 minutes, with guarantee circulation in the first oil circuit 81 and the second oil circuit 82 as coolant, thus protect
Demonstrate,prove the multi-gang air-conditioner off-premises station accuracy that all oil controls.
The control principle of the control method of the multi-gang air-conditioner off-premises station that the present invention provides is as follows:
In running, controller controls temperature detection first oil circuit 81 and the of two temperature sensors
The temperature value of two oil circuits 82 calculating temperature difference Δ T.
When system is run with Smaller load, it is low that controller control multi-gang air-conditioner off-premises station only leaves a varying capacity
Pressure cavity compressor 10, constant volume low-pressure cavity compressor 20 is closed, varying capacity low-pressure cavity compressor
Oil in 10 can be discharged along with coolant, separates that to be deposited on first separating of oil in the first oil eliminator 61
Device 61 bottom, then the oil return opening bottom the first oil eliminator 61 returns to constant volume low-pressure cavity compressor 20.
Being low-pressure cavity compressor due to what this system used, the chamber pressure of the low-pressure cavity compressor of operation is whole
The minimum pressure of system, therefore, under the effect of pressure reduction, the oil in constant volume low-pressure cavity compressor 20 leads to
Cross check valve and return to varying capacity low-pressure cavity compressor 10 from equal oilhole, it is ensured that the oil mass running compressor is wanted
Ask.
As it is shown on figure 3, when system can need relatively big, and controller controls two compressors and runs, and works as transfiguration simultaneously
Amount low-pressure cavity compressor 10 is when exporting less, depending on capacity low pressure cavity compressor 20 be with fixing at full capacity
Output, now, the pressure within constant volume low-pressure cavity compressor 20 is than varying capacity low-pressure cavity compressor 10
Internal pressure is low, and therefore under the effect of pressure reduction, the oil in varying capacity low-pressure cavity compressor 10 can pass through
All oil capillary tube (first throttle valve 41) is constantly taken away by constant volume low-pressure cavity compressor 20, works as varying capacity
When oil level in low-pressure cavity compressor 10 is higher than equal oilhole, constant volume low-pressure cavity compressor 20 will be from varying capacity
Taking most of oil in low-pressure cavity compressor 10 away, oil is temperature after all oil capillary tube (first throttle valve 41)
Δ T is less for difference；When the oil level in varying capacity low-pressure cavity compressor 10 is less than equal oilhole, constant volume low pressure
Cavity compressor 20 will take major part coolant from varying capacity low-pressure cavity compressor 10 away, and coolant is through all oil hairs
Tubule (first throttle valve 41) reducing pressure by regulating flow afterwards, now detection temperature difference T is relatively big, when temperature difference T is more than
Equal to 5 DEG C, and continuous service is more than after 30 minutes, then be judged to varying capacity low-pressure cavity compressor 10 oil level
Less than equal oilhole, controller stops constant volume low-pressure cavity compressor 20, the now compression of varying capacity low pressure chamber
The pressure of machine 10 cavity is less than the chamber pressure of constant volume low-pressure cavity compressor 20, under the effect of pressure reduction,
Oil in constant volume low-pressure cavity compressor 20 returns to varying capacity low pressure chamber pressure by check valve from the second equal oilhole
In contracting machine 10, it is ensured that the oil mass requirement of variable conpacitance compressor.
In sum, the multi-gang air-conditioner off-premises station that the present invention provides has constant volume low-pressure cavity compressor
With varying capacity low-pressure cavity compressor, at constant volume low-pressure cavity compressor and varying capacity low-pressure cavity compressor
All between oilhole, first throttle valve is set, one temperature detection is respectively set in the both sides of first throttle valve simultaneously
Device, when multi-gang air-conditioner off-premises station opens operation, in running, two temperatures detection device is always
Detect the first oil circuit and the temperature of the second oil circuit calculating temperature difference, owing to refrigeration oil is through first throttle valve
Front and back temperature difference is less, and coolant will produce the bigger temperature difference before and after first throttle valve, therefore,
Circulate in may determine that the first oil circuit and the second oil circuit by calculating temperature difference is coolant or fluid, from
And judge whether to need to perform all oil operations, to ensure that the oil level of two low-pressure cavity compressors is transported in safety
On row oil level, thus efficiently avoid the oil within two low-pressure cavity compressors less than Safe Levels
The damage problem caused, and then ensure that the service life of two low-pressure cavity compressors.The present invention provides
The control method of multi-gang air-conditioner off-premises station, it is possible to judge whether exactly to need to perform all oil operations.
In the description of this specification, term " first ", " second " are only used for the purpose described, and
It is not intended that instruction or hint relative importance；Unless otherwise clearly defined and limited, term " install ",
" being connected " etc. and all should be interpreted broadly, such as, " being connected " can be to be joined directly together, it is also possible to passes through
Intermediary is indirectly connected to.For the ordinary skill in the art, can understand as the case may be
Above-mentioned term concrete meaning in the present invention.
In the description of this specification, term " embodiment ", " some embodiments ", " be embodied as
Example " etc. description means to combine this embodiment or example describes specific features, structure, material or feature
It is contained at least one embodiment or the example of the present invention.In this manual, to above-mentioned term
Schematic representation is not necessarily referring to identical embodiment or example.And, the specific features of description,
Structure, material or feature can in any one or more embodiments or example in an appropriate manner
In conjunction with.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for
For those skilled in the art, the present invention can have various modifications and variations.All essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included in the present invention
Protection domain within.
Claims (10)
1. a multi-gang air-conditioner off-premises station, it is characterised in that including:
Varying capacity low-pressure cavity compressor, described varying capacity low-pressure cavity compressor is provided with the first equal oilhole；
Constant volume low-pressure cavity compressor, described constant volume low-pressure cavity compressor is provided with the second equal oilhole；
First check valve, the import of described first check valve is connected with the described second equal oilhole by the second oil circuit
Logical, outlet is connected with the described first equal oilhole by the first oil circuit；
First throttle valve, the first port of described first throttle valve is connected with described first oil circuit, the second end
Mouth is connected with described second oil circuit；
First temperature-detecting device, described first temperature-detecting device is arranged on described first oil circuit, is used for
Detect the temperature of described first oil circuit, and export the first temperature value；
Second temperature-detecting device, described second temperature-detecting device is arranged on described second oil circuit, is used for
Detect the temperature of described second oil circuit, and export the second temperature value；And
Controller, described controller receives described first temperature value and described second temperature value calculating temperature difference,
All oil operations are judged whether to according to the described temperature difference.
Multi-gang air-conditioner off-premises station the most according to claim 1, it is characterised in that
Described first temperature-detecting device and described second temperature-detecting device are temperature sensor.
Multi-gang air-conditioner off-premises station the most according to claim 2, it is characterised in that
Described temperature sensor is critesistor.
Multi-gang air-conditioner off-premises station the most according to claim 1, it is characterised in that
Described first throttle valve is capillary tube or electric expansion valve or heating power expansion valve.
Multi-gang air-conditioner off-premises station the most according to any one of claim 1 to 4, it is characterised in that
Described first equal oilhole is higher than the Safe Levels of described varying capacity low-pressure cavity compressor；
Described second equal oilhole is higher than the Safe Levels of described constant volume low-pressure cavity compressor.
Multi-gang air-conditioner off-premises station the most according to claim 5, it is characterised in that also include:
Gas-liquid separator, the outlet of described gas-liquid separator and the gas returning port of described varying capacity low-pressure cavity compressor
It is connected with the gas returning port of described constant volume low-pressure cavity compressor；
The row of the first oil eliminator, the import of described first oil eliminator and described varying capacity low-pressure cavity compressor
QI KOU is connected；And
The row of the second oil eliminator, the import of described second oil eliminator and described constant volume low-pressure cavity compressor
QI KOU is connected；
By the after the oil return opening of described first oil eliminator and the oil return opening parallel connection of described second oil eliminator
Two choke valves are connected with described constant volume low-pressure cavity compressor.
Multi-gang air-conditioner off-premises station the most according to claim 6, it is characterised in that also include:
The air vent of the second check valve, the import of described second check valve and described varying capacity low-pressure cavity compressor
Being connected, the outlet of described second check valve is connected with the import of described first oil eliminator；And
3rd check valve, the import of described 3rd check valve and the air vent of described constant volume low-pressure cavity compressor
Being connected, the outlet of described 3rd check valve is connected with the import of described second oil eliminator.
8. a control method for multi-gang air-conditioner off-premises station, equal between multiple low-pressure cavity compressors
Oil controls, and described multi-gang air-conditioner off-premises station is that the multi-connected machine as according to any one of claim 1 to 7 is empty
Adjust off-premises station, it is characterised in that comprise the following steps:
After receiving enabling signal, controller controls the first temperature-detecting device and detects the temperature of the first oil circuit
Value, and export the first temperature value, control the second temperature-detecting device simultaneously and detect the temperature value of the second oil circuit,
And export the second temperature value；
Described controller receives described first temperature value and described second temperature value, and carries out data process, root
All oil operations are judged whether to according to data processed result；
Wherein, data are processed as the temperature difference calculating described first temperature value with described second temperature value, when described
The temperature difference is more than or equal to preset temperature value, and when the described temperature difference is persistently extremely preset more than or equal to described preset temperature value
Time long, described controller sends and carries out all oil operational orders.
The control method of multi-gang air-conditioner off-premises station the most according to claim 8, it is characterised in that
Described preset temperature value is more than or equal to 5 DEG C.
The control method of multi-gang air-conditioner off-premises station the most according to claim 8, it is characterised in that
Described preset duration is more than or equal to 30 minutes.
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| CN105371530B (en) * | 2014-08-19 | 2018-06-29 | 广东美的暖通设备有限公司 | Outdoor unit, outdoor machine system, multi-variable air conditioning unit and its oily control method |
| CN105352064B (en) * | 2014-08-19 | 2019-01-18 | 广东美的暖通设备有限公司 | Outdoor unit, multi-joint outdoor machine system, multi-variable air conditioning unit and its oily control method |
| CN105444477B (en) * | 2014-08-19 | 2018-09-07 | 广东美的暖通设备有限公司 | Outdoor unit, outdoor machine system, multi-variable air conditioning unit and its oily control method |
| CN104748782B (en) * | 2015-04-09 | 2017-07-11 | 宁波奥克斯电气股份有限公司 | Multi-joint unit whether the decision method of oil starvation |
| CN107747789B (en) * | 2017-08-30 | 2019-11-05 | 青岛海尔空调器有限总公司 | The fault detection and processing method of air-conditioning and its supercooling tube group |
| CN108548282B (en) * | 2018-06-29 | 2019-12-31 | 珠海格力电器股份有限公司 | Control method and device of air conditioner, computer equipment and air conditioner |
| CN113883683B (en) * | 2021-09-28 | 2024-01-19 | 青岛海尔中央空调有限公司 | Control method for multi-split air conditioning unit |
| CN115962553A (en) * | 2022-12-02 | 2023-04-14 | 珠海格力电器股份有限公司 | Control method and device for outdoor unit module and multi-split system |
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| CN102628628A (en) * | 2012-03-19 | 2012-08-08 | 广东美的暖通设备有限公司 | Oil balancing device for multi-connected machine and control method thereof |
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| CN203454472U (en) * | 2012-07-31 | 2014-02-26 | 广东美的暖通设备有限公司 | Multi-split air conditioning system and oil balance devices thereof |
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| JP3718870B2 (en) * | 1995-01-31 | 2005-11-24 | ダイキン工業株式会社 | Operation control device for refrigeration equipment |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628628A (en) * | 2012-03-19 | 2012-08-08 | 广东美的暖通设备有限公司 | Oil balancing device for multi-connected machine and control method thereof |
| CN202648255U (en) * | 2012-04-26 | 2013-01-02 | 青岛海尔空调电子有限公司 | Oil way system of frequency-conversion multi-connected unit |
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