CN103982951A - Multi-split air conditioning outdoor unit and control method thereof - Google Patents
Multi-split air conditioning outdoor unit and control method thereof Download PDFInfo
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- CN103982951A CN103982951A CN201410188670.0A CN201410188670A CN103982951A CN 103982951 A CN103982951 A CN 103982951A CN 201410188670 A CN201410188670 A CN 201410188670A CN 103982951 A CN103982951 A CN 103982951A
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004378 air conditioning Methods 0.000 title abstract description 5
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- 239000007788 liquid Substances 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 239000003921 oil Substances 0.000 description 191
- 239000003507 refrigerant Substances 0.000 description 25
- 239000012530 fluid Substances 0.000 description 15
- 238000005057 refrigeration Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
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- 239000010687 lubricating oil Substances 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000004087 circulation Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
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- 230000001105 regulatory effect Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000004781 supercooling Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 1
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Abstract
The invention provides a multi-split air conditioning outdoor unit and a control method thereof. The multi-split air conditioning outdoor unit comprises a variable-capacity low-pressure cavity compressor, a first one-way valve and a fixed-capacity low-pressure cavity compressor, and the variable-capacity low-pressure cavity compressor and the fixed-capacity low-pressure cavity compressor are respectively provided with a first oil balancing hole and a second oil balancing hole; an inlet of the first one-way valve is communicated with the second oil balancing hole through a second oil circuit, and an outlet of the first one-way valve is communicated with the first oil balancing hole through a first oil circuit; the first one-way valve is connected with a first throttling valve in parallel, the first oil circuit is provided with a first temperature detection device for detecting the temperature; the second oil circuit is provided with a second temperature detection device for detecting the temperature; a controller is used for receiving detection values of the first temperature detection device and the second temperature detection device, calculating temperature difference and judging whether oil balancing operation can be carried out or not according to the temperature difference. According to the technical scheme provided by the invention, the problem that the compressors are damaged due to a too-low oil level can be effectively avoided.
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 thereof.
Background technology
Multi-online air-conditioning system is comprised of some air-conditioning equipments, can realize the independent assortment of many off-premises stations and many indoor sets.The capacity of a multi-connected machine system has ten even more than tens conventionally, multi-connected machine system pipeline is complicated, there is multiple compressors outdoor unit modules inside, when load is different, the working order of every compressor is also different, the presumable high loaded process of compressor in system, what have does not turn round, the distribution that very easily occurs in this case each compressor chamber oil is uneven, some compressor possibility lubricating oil is not enough, some compressor possibility lubricating oil is too much, so very easily cause the damage of compressor, especially be provided with the multi-gang air-conditioner off-premises station of a plurality of low-pressure cavity compressors, when low-pressure cavity compressor output in parallel is uneven, the pressure of each low-pressure cavity compressor inside is not identical yet, oil can be offset toward the low low-pressure cavity compressor of pressure from the high low-pressure cavity compressor of pressure, if the oil of low-pressure cavity compressor inside is lower than Safe Levels, the damage of low-pressure cavity compressor will very easily be caused.
Summary of the invention
The present invention is intended at least solve one of technical problem existing in prior art.
For this reason, one object of the present invention is, a kind of multi-gang air-conditioner off-premises station that can effectively guarantee oil content balancing between low-pressure cavity compressor is provided.
Another object of the present invention is, a kind of control method of multi-gang air-conditioner off-premises station is provided.
For achieving the above object, the invention provides a kind of multi-gang air-conditioner off-premises station, comprising: varying capacity low-pressure cavity compressor, is provided with the first equal oilhole on described varying capacity low-pressure cavity compressor; Constant volume low-pressure cavity compressor, is provided with the second equal oilhole on described constant volume low-pressure cavity compressor; The first check valve, the import of described the first check valve is connected with the described second equal oilhole by the second oil circuit, and 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 the first oil circuit, and the second port is connected with described the second oil circuit; The first temperature-detecting device, described the first temperature-detecting device is arranged on described the first oil circuit, for detection of the temperature of described the first oil circuit, and exports the first temperature value; The second temperature-detecting device, described the second temperature-detecting device is arranged on described the second oil circuit, for detection of the temperature of described the second oil circuit, and exports the second temperature value; And controller, described controller receives described the first temperature value and described the second temperature value calculating temperature difference, according to the described temperature difference, judges whether to carry out all oil operations.
Multi-gang air-conditioner off-premises station provided by the invention has constant volume low-pressure cavity compressor and varying capacity low-pressure cavity compressor, variable conpacitance compressor and constant volume compressor are provided with equal oilhole, between constant volume low-pressure cavity compressor and the equal oilhole of varying capacity low-pressure cavity compressor, the first check valve and first throttle valve are set, the direction of the first check valve is from constant volume compressor to variable conpacitance compressor, first throttle valve is in parallel with the first check valve, in the both sides of first throttle valve, one temperature-detecting device is respectively set simultaneously, when multi-gang air-conditioner off-premises station is opened operation, in running, two temperatures checkout gear detects temperature the calculating temperature difference of the first oil circuit and the second oil circuit always, because refrigeration oil differs less through temperature before and after first throttle valve, and refrigerant is through will producing the larger temperature difference before and after first throttle valve, therefore, by calculating temperature difference, can judge that what in the first oil circuit and the second oil circuit, circulate is refrigerant or fluid, thereby judge whether to need to carry out all oil operations, with the oil level that guarantees two low-pressure cavity compressors on safe operation oil level, thereby the damage problem that the oil of effectively having avoided two low-pressure cavity compressor inside causes lower than Safe Levels, and then guaranteed service life of two low-pressure cavity compressors.
In addition, the multi-gang air-conditioner off-premises station providing according to the above embodiment of the present invention also has following additional technical feature:
According to one embodiment of present invention, described the first temperature-detecting device and described the second temperature-detecting device are temperature sensor.
Temperature sensor can direct feeling the first oil circuit and the temperature of the second oil circuit, and the temperature value output that becomes controller to need the temperature transition of impression, the first temperature-detecting device and the second temperature-detecting device all adopt temperature sensor, whether temperature sensor can be carried out the equal oily judgement operating for controller data foundation is accurately provided, thereby has guaranteed the service life of the low-pressure cavity compressor of multi-gang air-conditioner off-premises station.
According to one embodiment of present invention, described temperature sensor is thermistor.
Thermistor has the advantages such as volume is little, highly sensitive, good stability, easy machine-shaping, use thermistor as temperature sensor, to detect the temperature of the first oil circuit and the second oil circuit, can effectively guarantee the accuracy of testing result, thereby effectively guarantee that multi-gang air-conditioner off-premises station is judging whether to carry out all accuracys of oil operation.
According to one embodiment of present invention, described first throttle valve is capillary or electric expansion valve or heating power expansion valve.
Capillary or electric expansion valve or heating power expansion valve all have good throttling action, and wherein, the degree of supercooling that the aperture of electric expansion valve and heating power expansion valve can be is as required controlled, and production cost capillaceous low, assemble simple and convenient.
According to one embodiment of present invention, the described first equal oilhole is higher than the Safe Levels of described varying capacity low-pressure cavity compressor; The 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 greater than the pressure of constant volume low-pressure cavity compressor, fluid in varying capacity low-pressure cavity compressor is by the first equal oilhole, through the first oil circuit, first throttle valve, the second oil circuit flows into constant volume low-pressure cavity compressor by the second equal oilhole, for fear of the fluid in varying capacity low-pressure cavity compressor, all flow into constant volume low-pressure cavity compressor, cause in varying capacity low-pressure cavity compressor without oil lubrication, the problem that causes varying capacity low-pressure cavity compressor to damage, design the first equal oilhole is higher than the Safe Levels of varying capacity low-pressure cavity compressor, equally, when the pressure of varying capacity low-pressure cavity compressor is less than the pressure of constant volume low-pressure cavity compressor, fluid in constant volume low-pressure cavity compressor is by the second equal oilhole, through the second oil circuit, the first check valve, the first oil circuit flows into varying capacity low-pressure cavity compressor by the first equal oilhole, for fear of the fluid in constant volume low-pressure cavity compressor, all flow into varying capacity low-pressure cavity compressor, cause in varying capacity low-pressure cavity compressor without oil lubrication, the problem that causes constant volume low-pressure cavity compressor to damage, design the second equal oilhole 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 comprises: gas-liquid separator, and the outlet of described gas-liquid separator is connected with the gas returning port of described varying capacity low-pressure cavity compressor and the gas returning port of described constant volume low-pressure cavity compressor; The first oil eliminator, the import of described the first oil eliminator is connected with the exhaust outlet of described varying capacity low-pressure cavity compressor; And second oil eliminator, the import of described the second oil eliminator is connected with the exhaust outlet of described constant volume low-pressure cavity compressor; After the oil return opening parallel connection of the oil return opening of described the first oil eliminator and described the second oil eliminator, by the second choke valve, be connected with described constant volume low-pressure cavity compressor.
For fear of liquid refrigerants, enter in varying capacity low-pressure cavity compressor and constant volume low-pressure cavity compressor and cause liquid hammer problem, the design outlet of gas-liquid separator is connected with the gas returning port of varying capacity low-pressure cavity compressor and constant volume low-pressure cavity compressor gas returning port, to guarantee the service life of varying capacity low-pressure cavity compressor and constant volume low-pressure cavity compressor, at multi-gang air-conditioner off-premises station in running, oil in varying capacity low-pressure cavity compressor and constant volume low-pressure cavity compressor can be discharged along with refrigerant, for fear of fluid, waste, the first oil-liquid separator is set to be connected with the exhaust outlet of varying capacity low-pressure cavity compressor, the second oil-liquid separator is connected with the exhaust outlet of constant volume low-pressure cavity compressor, and by the second choke valve, be connected with constant volume low-pressure cavity compressor after the oil return opening parallel connection of the oil return opening of the first oil eliminator and the second oil eliminator, be that oil in low-pressure cavity compressor is along with refrigerant is discharged after compressor, in oil eliminator, separate and be deposited on oil eliminator bottom, from joining, the oil return opening of oil eliminator bottom gets back to constant volume compressor by the second choke valve again, thereby effectively improved the utilization rate of lubricating oil.
According to one embodiment of present invention, described multi-gang air-conditioner off-premises station also comprises: the second check valve, the import of described the second check valve is connected with the exhaust outlet of described varying capacity low-pressure cavity compressor, and the outlet of described the second check valve is connected with the import of described the first oil eliminator; And the 3rd check valve, the import of described the 3rd check valve is connected with the exhaust outlet of described constant volume low-pressure cavity compressor, and the outlet of described the 3rd check valve is connected with the import of described the second oil eliminator.
Second aspect present invention embodiment provides a kind of control method of multi-gang air-conditioner off-premises station, for the equal oil between a plurality of low-pressure cavity compressors, control, the multi-gang air-conditioner off-premises station that described multi-gang air-conditioner off-premises station provides for the arbitrary embodiment of above-mentioned first aspect, the control method of described multi-gang air-conditioner off-premises station comprises the following steps:
Receive after enabling signal, controller is controlled the temperature value that the first temperature-detecting device detects the first oil circuit, and exports the first temperature value, controls the temperature value that the second temperature-detecting device detects the second oil circuit simultaneously, and exports the second temperature value;
Described controller receives described the first temperature value and described the second temperature value, and carries out data processing, according to data processed result, judges whether to carry out all oil operations;
Wherein, data processing is for calculating the temperature difference of described the first temperature value and described the second temperature value, when the described temperature difference is more than or equal to preset temperature value, and described difference is while continuing to be more than or equal to described preset temperature value to default duration, and described controller sends and carries out equal oily operational order.
The control method of multi-gang air-conditioner off-premises station provided by the invention, in running, controller is controlled temperature the calculating temperature difference that two temperatures checkout gear detects the first oil circuit and the second oil circuit always, because refrigeration oil differs less through temperature before and after first throttle valve, and refrigerant is through will producing the larger temperature difference before and after first throttle valve, by controller calculating temperature difference, and the temperature difference calculating and preset value are compared, if the temperature difference is greater than preset value and continues to default duration, controller judges whether to carry out equal oil operation according to comparative result, with the oil level that guarantees two low-pressure cavity compressors all on safe operation oil level, thereby the damage problem that the oil of effectively having avoided two low-pressure cavity compressor inside causes lower than Safe Levels, and then guaranteed service life of two low-pressure cavity compressors.
The control method of the multi-gang air-conditioner off-premises station providing according to the above embodiment of the present invention in addition, also has following additional technical feature:
According to one embodiment of present invention, described preset temperature value is more than or equal to 5 ℃.
Because refrigeration oil differs less through temperature before and after first throttle valve, and refrigerant is through will producing the larger temperature difference before and after first throttle valve, design preset temperature value is more than or equal to 5 ℃, has effectively avoided the inaccurate problem of equal oil operation causing through the little temperature difference before and after first throttle valve because of refrigeration oil.
According to one embodiment of present invention, described default duration is more than or equal to 30 minutes.
For fear of occurring because being mixed with the inaccurate situation of detection that gaseous coolant causes in fluid, default duration is more than or equal to 30 minutes, take that what guarantee to circulate in the first oil circuit and the second oil circuit is refrigerant, thereby has guaranteed the multi-gang air-conditioner off-premises station accuracy that all oil is controlled.
Additional aspect of the present invention and advantage will provide in description part below, and part will become obviously from the following description, or recognize by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:
Fig. 1 is according to the partial structurtes schematic diagram of the multi-gang air-conditioner off-premises station described in one embodiment of the invention;
Fig. 2 is according to the schematic flow diagram of the control method of the multi-gang air-conditioner off-premises station described in one embodiment of the invention;
Fig. 3 is the schematic flow diagram of data processing in the control method of the multi-gang air-conditioner off-premises station shown in Fig. 2.
Wherein, in Fig. 1, the corresponding relation between Reference numeral and component names is:
10 varying capacity low-pressure cavity compressors, 20 constant volume low-pressure cavity compressors, 31 first check valves, 32 second check valves, 33 the 3rd check valves, 41 first throttle valves, 42 second choke valves, 51 first temperature-detecting devices, 52 second temperature-detecting devices, 61 first oil eliminators, 62 second oil eliminators, 70 gas-liquid separators, 81 first oil circuits, 82 second oil circuits.
The specific embodiment
In order more clearly to understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, in the situation that not conflicting, the application's embodiment and the feature in embodiment can combine mutually.
A lot of details have been set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from mode described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
1 description provides multi-gang air-conditioner off-premises station according to some embodiments of the invention with reference to the accompanying drawings.
As shown in Figure 1, the multi-gang air-conditioner off-premises station that one embodiment of the invention provides, comprising: varying capacity low-pressure cavity compressor 10, constant volume low-pressure cavity compressor 20, the first check valve 31, first throttle valve 41, the first temperature-detecting device 51, the second temperature-detecting device 52 and controller.
Wherein, on varying capacity low-pressure cavity compressor 10, be provided with the first equal oilhole, on constant volume low-pressure cavity compressor 20, be provided with the second equal oilhole; The import of the first check valve 31 is connected with the second equal oilhole by the second oil circuit 82, and outlet is connected with the first equal oilhole by the first oil circuit 81; The first port of first throttle valve 41 is connected with the first oil circuit 81, and the second port is connected with the second oil circuit 82; The first temperature-detecting device 51 is arranged on the first oil circuit 81, for detection of the temperature of the first oil circuit 81, and exports the first temperature value; The second temperature-detecting device 52 is arranged on the second oil circuit 82, for detection of the temperature of the second oil circuit 82, and exports the second temperature value; Controller receives the first temperature value and the second temperature value calculating temperature difference, according to the temperature difference, judges whether to carry out all oil operations.
The multi-gang air-conditioner off-premises station that the present embodiment provides has constant volume low-pressure cavity compressor 20 and varying capacity low-pressure cavity compressor 10, variable conpacitance compressor and constant volume compressor are provided with equal oilhole, between constant volume low-pressure cavity compressor 20 and the equal oilhole of varying capacity low-pressure cavity compressor 10, the first check valve 31 and first throttle valve 41 are set, the direction of the first check valve 31 is from constant volume compressor to variable conpacitance compressor, first throttle valve 41 is in parallel with the first check valve 31, in the both sides of first throttle valve 41, a temperature-detecting device is respectively set simultaneously, when multi-gang air-conditioner off-premises station is opened operation, in running, two temperatures checkout gear detects temperature the calculating temperature difference of the first oil circuit 81 and the second oil circuit 82 all the time, because refrigeration oil differs less through first throttle valve 41 front and back temperature, and refrigerant will produce the larger temperature difference through first throttle valve 41 front and back, therefore, what by calculating temperature difference, can judge the first oil circuit 81 and the second oil circuit 82 interior circulations is refrigerant or fluid, thereby judge whether to need to carry out all oil operations, with the oil level that guarantees two low-pressure cavity compressors on safe operation oil level, thereby the damage problem that the oil of effectively having avoided two low-pressure cavity compressor inside causes lower than Safe Levels, and then guaranteed service life of two low-pressure cavity compressors.
Particularly, the first equal oilhole is higher than the Safe Levels of varying capacity low-pressure cavity compressor 10, and the second equal oilhole is higher than the Safe Levels of constant volume low-pressure cavity compressor 20; First throttle valve 41 is capillary or electric expansion valve or heating power expansion valve.
When the pressure of varying capacity low-pressure cavity compressor 10 is greater than the pressure of constant volume low-pressure cavity compressor 20, fluid in varying capacity low-pressure cavity compressor 10 is by the first equal oilhole, through the first oil circuit 81, first throttle valve 41, the second oil circuit 82 flows into constant volume low-pressure cavity compressor 20 by the second equal oilhole, for fear of the fluid in varying capacity low-pressure cavity compressor 10, all flow into constant volume low-pressure cavity compressor 20, cause varying capacity low-pressure cavity compressor 10 interior without oil lubrication, the problem that causes varying capacity low-pressure cavity compressor 10 to damage, design the first equal oilhole is higher than the Safe Levels of varying capacity low-pressure cavity compressor 10, equally, when the pressure of varying capacity low-pressure cavity compressor 10 is less than the pressure of constant volume low-pressure cavity compressor 20, fluid in constant volume low-pressure cavity compressor 20 is by the second equal oilhole, through the second oil circuit 82, the first check valve 31, the first oil circuit 81 flows into varying capacity low-pressure cavity compressor 10 by the first equal oilhole, for fear of the fluid in constant volume low-pressure cavity compressor 20, all flow into varying capacity low-pressure cavity compressor 10, cause varying capacity low-pressure cavity compressor 10 interior without oil lubrication, the problem that causes constant volume low-pressure cavity compressor 20 to damage, design the second equal oilhole is higher than the Safe Levels of varying capacity low-pressure cavity compressor 10, capillary or electric expansion valve or heating power expansion valve all have good throttling action, and wherein, the degree of supercooling that the aperture of electric expansion valve and heating power expansion valve can be is as required controlled, and production cost capillaceous low, assemble simple and convenient.
Preferably, multi-gang air-conditioner off-premises station also comprises: gas-liquid separator 70, the first oil eliminator 61, the second check valve 32, the second oil eliminator 62 and the 3rd check valve 33.
Wherein, the outlet of gas-liquid separator 70 is connected with the gas returning port of varying capacity low-pressure cavity compressor 10 and the gas returning port of constant volume low-pressure cavity compressor 20; The import of the second check valve 32 is connected with the exhaust outlet of varying capacity low-pressure cavity compressor 10, and the outlet of the second check valve 32 is connected with the import of the first oil eliminator 61; The import of the 3rd check valve 33 is connected with the exhaust outlet of constant volume low-pressure cavity compressor 20, and the outlet of the 3rd check valve 33 is connected with the import of the second oil eliminator 62; After the oil return opening parallel connection of the oil return opening of the first oil eliminator 61 and the second oil eliminator 62, by the second choke valve 42, be connected with constant volume low-pressure cavity compressor 20.
For fear of liquid refrigerants, enter in varying capacity low-pressure cavity compressor 10 and constant volume low-pressure cavity compressor 20 and cause liquid hammer problem, the design outlet of gas-liquid separator 70 is connected with the gas returning port of varying capacity low-pressure cavity compressor 10 and constant volume low-pressure cavity compressor 20 gas returning ports, to guarantee the service life of varying capacity low-pressure cavity compressor 10 and constant volume low-pressure cavity compressor 20, at multi-gang air-conditioner off-premises station in running, oil in varying capacity low-pressure cavity compressor 10 and constant volume low-pressure cavity compressor 20 can be discharged along with refrigerant, for fear of fluid, waste, the first oil-liquid separator is set to be connected with the exhaust outlet of varying capacity low-pressure cavity compressor 10, the second oil-liquid separator is connected with the exhaust outlet of constant volume low-pressure cavity compressor 20, and by the second choke valve 42, be connected with constant volume low-pressure cavity compressor 20 after the oil return opening parallel connection of the oil return opening of the first oil eliminator 61 and the second oil eliminator 62, be that oil in low-pressure cavity compressor is along with refrigerant is discharged after compressor, in oil eliminator, separate and be deposited on oil eliminator bottom, from joining, the oil return opening of oil eliminator bottom gets back to constant volume compressor by the second choke valve 42 again, thereby effectively improved the utilization rate of lubricating oil.
Particularly, first throttle valve 41 is capillary or electric expansion valve or heating power expansion valve.
In a specific embodiment of the present embodiment, preferably, the first temperature-detecting device 51 and the second temperature-detecting device 52 are temperature sensor.
Temperature sensor can direct feeling the first oil circuit 81 and the temperature of the second oil circuit 82, and the temperature value output that becomes controller to need the temperature transition of impression, the first temperature-detecting device 51 and the second temperature-detecting device 52 all adopt temperature sensor, the judgement whether temperature sensor carries out equal oil operation for controller provides data foundation accurately, thereby has guaranteed the service life of the low-pressure cavity compressor of multi-gang air-conditioner off-premises station.
Particularly, described temperature sensor is thermistor.
Thermistor has the advantages such as volume is little, highly sensitive, good stability, easy machine-shaping, use thermistor as temperature sensor, to detect the temperature of the first oil circuit 81 and the second oil circuit 82, can effectively guarantee the accuracy of testing result, thereby effectively guarantee that multi-gang air-conditioner off-premises station is judging whether to carry out all accuracys of oil operation.
As shown in Figure 1, the operation principle of multi-gang air-conditioner off-premises station provided by the invention is as follows:
The exhaust outlet of the exhaust outlet of varying capacity low-pressure cavity compressor 10 and constant volume low-pressure cavity compressor 20 respectively connects an oil eliminator, in running, oil in low-pressure cavity compressor can be discharged along with refrigerant, in oil eliminator, separate and be deposited on oil eliminator bottom, then by oil return capillary (the second choke valve 42), get back to constant volume compressor from the oil return opening of oil eliminator bottom is joined.Simultaneously, varying capacity low-pressure cavity compressor 10 and constant volume low-pressure cavity compressor 20 are respectively equipped with the first equal oilhole and the second equal oilhole, the position of two equal oilholes is determined by low-pressure cavity compressor safe operation oil level, generally high than low-pressure cavity compressor minimum safe operation oil level, between the equal oilhole of two low-pressure cavity compressors, a check valve is set, direction is from constant volume low-pressure cavity compressor 20 to varying capacity low-pressure cavity compressor 10, at the check valve equal oily capillary of two terminations one (first throttle valve 41), in adapter place of oil return capillary, one temperature sensor is respectively set simultaneously, in running, detect temperature the calculating temperature difference Δ T of two temperature sensors always.
When system is during with little load operation, multi-gang air-conditioner off-premises station is only opened a varying capacity low-pressure cavity compressor 10, constant volume low-pressure cavity compressor 20 is in closed condition, oil in varying capacity low-pressure cavity compressor 10 can be discharged along with refrigerant, in the first oil eliminator 61, separate and be deposited on the first oil eliminator 61 bottoms, then get back to constant volume low-pressure cavity compressor 20 from the oil return opening of the first oil eliminator 61 bottoms.The low-pressure cavity compressor that is due to this system use, the minimum pressure that the chamber pressure of the low-pressure cavity compressor of operation is whole system, therefore, under the effect of pressure reduction, oil in constant volume low-pressure cavity compressor 20 is got back to varying capacity low-pressure cavity compressor 10 from equal oilhole by check valve, guarantees the oil mass requirement of operation compressor.
When system can need larger, need to move two compressors simultaneously, when varying capacity low-pressure cavity compressor 10 output hour, and constant volume low-pressure cavity compressor 20 is the output at full capacity of fixing, now, the pressure of constant volume low-pressure cavity compressor 20 inside is lower than the pressure of varying capacity low-pressure cavity compressor 10 inside, therefore under the effect of pressure reduction, oil in varying capacity low-pressure cavity compressor 10 can constantly be taken away by constant volume low-pressure cavity compressor 20 by equal oily capillary (first throttle valve 41), oil level in varying capacity low-pressure cavity compressor 10 is during higher than equal oilholes, constant volume low-pressure cavity compressor 20 will be taken most of oil away from varying capacity low-pressure cavity compressor 10, temperature difference T after equal oily capillary (first throttle valve 41) is less for oil, oil level in varying capacity low-pressure cavity compressor 10 is during lower than equal oilholes, constant volume low-pressure cavity compressor 20 will be taken most of refrigerant away from varying capacity low-pressure cavity compressor 10, refrigerant is reducing pressure by regulating flow after equal oily capillary (first throttle valve 41), now detect temperature difference T larger, be judged to be varying capacity low-pressure cavity compressor 10 oil levels lower than equal oilhole, after operation a period of time T, stop constant volume low-pressure cavity compressor 20, now the pressure of varying capacity low-pressure cavity compressor 10 cavitys 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 is got back to varying capacity low-pressure cavity compressor 10 from the second equal oilhole by check valve, guarantee the oil mass requirement of variable conpacitance compressor.
As depicted in figs. 1 and 2, the control method of the multi-gang air-conditioner off-premises station that another embodiment of the present invention provides, for the equal oil between a plurality of low-pressure cavity compressors, control, the multi-gang air-conditioner off-premises station that multi-gang air-conditioner off-premises station provides for above-mentioned arbitrary embodiment, the control method of multi-gang air-conditioner off-premises station comprises the following steps:
Step 202, receive after enabling signal, controller is controlled the first temperature-detecting device 51 and is detected the temperature value of the first oil circuit 81, and exports 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 processing, according to data processed result, judges whether to carry out all oil operations;
Wherein, as shown in Figure 3, data processing is for calculating the temperature difference of described the first temperature value and described the second temperature value, when the described temperature difference is more than or equal to preset temperature value, and when difference continues to be more than or equal to preset temperature value to default duration, controller sends and carries out equal oily operational order.
The control method of the multi-gang air-conditioner off-premises station that the present embodiment provides, in running, controller is controlled temperature the calculating temperature difference that two temperatures checkout gear detects the first oil circuit 81 and the second oil circuit 82 always, because refrigeration oil differs less through first throttle valve 41 front and back temperature, and refrigerant will produce the larger temperature difference through first throttle valve 41 front and back, by controller calculating temperature difference, and the temperature difference calculating and preset value are compared, if the temperature difference is greater than preset value and continues to default duration, controller judges whether to carry out equal oil operation according to comparative result, with the oil level that guarantees two low-pressure cavity compressors all on safe operation oil level, thereby the damage problem that the oil of effectively having avoided two low-pressure cavity compressor inside causes lower than Safe Levels, and then guaranteed service life of two low-pressure cavity compressors.
Particularly, preset temperature value is more than or equal to 5 ℃, and default duration is more than or equal to 30 minutes.
Because refrigeration oil differs less through first throttle valve 41 front and back temperature, and refrigerant will produce the larger temperature difference through first throttle valve 41 front and back, design preset temperature value is more than or equal to 5 ℃, has effectively avoided the inaccurate problem of equal oil operation causing through the little temperature difference of first throttle valve 41 front and back because of refrigeration oil; For fear of the inaccurate situation generation of detection causing because being mixed with gaseous coolant in fluid, default duration is more than or equal to 30 minutes, take that what guarantee the first oil circuit 81 and the second oil circuit 82 interior circulations is refrigerant, thereby guaranteed the multi-gang air-conditioner off-premises station accuracy that all oil is controlled.
The control principle of the control method of multi-gang air-conditioner off-premises station provided by the invention is as follows:
In running, controller is controlled temperature detection first oil circuit 81 of two temperature sensors and temperature value the calculating temperature difference Δ T of the second oil circuit 82.
When system is during with little load operation, controller is controlled multi-gang air-conditioner off-premises station and is only opened a varying capacity low-pressure cavity compressor 10, constant volume low-pressure cavity compressor 20 is in closed condition, oil in varying capacity low-pressure cavity compressor 10 can be discharged along with refrigerant, in the first oil eliminator 61, separate and be deposited on the first oil eliminator 61 bottoms, then get back to constant volume low-pressure cavity compressor 20 from the oil return opening of the first oil eliminator 61 bottoms.The low-pressure cavity compressor that is due to this system use, the minimum pressure that the chamber pressure of the low-pressure cavity compressor of operation is whole system, therefore, under the effect of pressure reduction, oil in constant volume low-pressure cavity compressor 20 is got back to varying capacity low-pressure cavity compressor 10 from equal oilhole by check valve, guarantees the oil mass requirement of operation compressor.
As shown in Figure 3, when system can need larger, controller is controlled two compressors and is moved simultaneously, when varying capacity low-pressure cavity compressor 10 output hour, and constant volume low-pressure cavity compressor 20 is the output at full capacity of fixing, now, the pressure of constant volume low-pressure cavity compressor 20 inside is lower than the pressure of varying capacity low-pressure cavity compressor 10 inside, therefore under the effect of pressure reduction, oil in varying capacity low-pressure cavity compressor 10 can constantly be taken away by constant volume low-pressure cavity compressor 20 by equal oily capillary (first throttle valve 41), oil level in varying capacity low-pressure cavity compressor 10 is during higher than equal oilholes, constant volume low-pressure cavity compressor 20 will be taken most of oil away from varying capacity low-pressure cavity compressor 10, temperature difference T after equal oily capillary (first throttle valve 41) is less for oil, oil level in varying capacity low-pressure cavity compressor 10 is during lower than equal oilholes, constant volume low-pressure cavity compressor 20 will be taken most of refrigerant away from varying capacity low-pressure cavity compressor 10, refrigerant is reducing pressure by regulating flow after equal oily capillary (first throttle valve 41), now detect temperature difference T larger, when temperature difference T is more than or equal to 5 ℃, and continuous service was greater than after 30 minutes, be judged to be varying capacity low-pressure cavity compressor 10 oil levels lower than equal oilhole, controller stops constant volume low-pressure cavity compressor 20, now the pressure of varying capacity low-pressure cavity compressor 10 cavitys 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 is got back to varying capacity low-pressure cavity compressor 10 from the second equal oilhole by check valve, guarantee the oil mass requirement of variable conpacitance compressor.
In sum, multi-gang air-conditioner off-premises station provided by the invention has constant volume low-pressure cavity compressor and varying capacity low-pressure cavity compressor, between constant volume low-pressure cavity compressor and the equal oilhole of varying capacity low-pressure cavity compressor, first throttle valve is set, in the both sides of first throttle valve, one temperature-detecting device is respectively set simultaneously, when multi-gang air-conditioner off-premises station is opened operation, in running, two temperatures checkout gear detects temperature the calculating temperature difference of the first oil circuit and the second oil circuit always, because refrigeration oil differs less through temperature before and after first throttle valve, and refrigerant is through will producing the larger temperature difference before and after first throttle valve, therefore, by calculating temperature difference, can judge that what in the first oil circuit and the second oil circuit, circulate is refrigerant or fluid, thereby judge whether to need to carry out all oil operations, with the oil level that guarantees two low-pressure cavity compressors on safe operation oil level, thereby the damage problem that the oil of effectively having avoided two low-pressure cavity compressor inside causes lower than Safe Levels, and then guaranteed service life of two low-pressure cavity compressors.The control method of multi-gang air-conditioner off-premises station provided by the invention, can judge whether to need to carry out all oil operations exactly.
In the description of this description, term " first ", " second " be the object for describing only, and can not be interpreted as indication or hint relative importance; Unless otherwise clearly defined and limited, term " installation ", " being connected " etc. all should be interpreted broadly, and for example, " being connected " can be to be directly connected, and also can indirectly be connected by intermediary.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 description, the description of term " embodiment ", " some embodiment ", " specific embodiment " etc. means to be contained at least one embodiment of the present invention or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a multi-gang air-conditioner off-premises station, is characterized in that, comprising:
Varying capacity low-pressure cavity compressor, is provided with the first equal oilhole on described varying capacity low-pressure cavity compressor;
Constant volume low-pressure cavity compressor, is provided with the second equal oilhole on described constant volume low-pressure cavity compressor;
The first check valve, the import of described the first check valve is connected with the described second equal oilhole by the second oil circuit, and 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 the first oil circuit, and the second port is connected with described the second oil circuit;
The first temperature-detecting device, described the first temperature-detecting device is arranged on described the first oil circuit, for detection of the temperature of described the first oil circuit, and exports the first temperature value;
The second temperature-detecting device, described the second temperature-detecting device is arranged on described the second oil circuit, for detection of the temperature of described the second oil circuit, and exports the second temperature value; And
Controller, described controller receives described the first temperature value and described the second temperature value calculating temperature difference, according to the described temperature difference, judges whether to carry out all oil operations.
2. multi-gang air-conditioner off-premises station according to claim 1, is characterized in that,
Described the first temperature-detecting device and described the second temperature-detecting device are temperature sensor.
3. multi-gang air-conditioner off-premises station according to claim 2, is characterized in that,
Described temperature sensor is thermistor.
4. multi-gang air-conditioner off-premises station according to claim 1, is characterized in that,
Described first throttle valve is capillary or electric expansion valve or heating power expansion valve.
5. according to the multi-gang air-conditioner off-premises station described in any one in claim 1 to 4, it is characterized in that,
The described first equal oilhole is higher than the Safe Levels of described varying capacity low-pressure cavity compressor;
The described second equal oilhole is higher than the Safe Levels of described constant volume low-pressure cavity compressor.
6. multi-gang air-conditioner off-premises station according to claim 5, is characterized in that, also comprises:
Gas-liquid separator, the outlet of described gas-liquid separator is connected with the gas returning port of described varying capacity low-pressure cavity compressor and the gas returning port of described constant volume low-pressure cavity compressor;
The first oil eliminator, the import of described the first oil eliminator is connected with the exhaust outlet of described varying capacity low-pressure cavity compressor; And
The second oil eliminator, the import of described the second oil eliminator is connected with the exhaust outlet of described constant volume low-pressure cavity compressor;
After the oil return opening parallel connection of the oil return opening of described the first oil eliminator and described the second oil eliminator, by the second choke valve, be connected with described constant volume low-pressure cavity compressor.
7. multi-gang air-conditioner off-premises station according to claim 6, is characterized in that, also comprises:
The second check valve, the import of described the second check valve is connected with the exhaust outlet of described varying capacity low-pressure cavity compressor, and the outlet of described the second check valve is connected with the import of described the first oil eliminator; And
The 3rd check valve, the import of described the 3rd check valve is connected with the exhaust outlet of described constant volume low-pressure cavity compressor, and the outlet of described the 3rd check valve is connected with the import of described the second oil eliminator.
8. the control method of a multi-gang air-conditioner off-premises station, for the equal oil between a plurality of low-pressure cavity compressors, control, described multi-gang air-conditioner off-premises station is the multi-gang air-conditioner off-premises station as described in any one in claim 1 to 7, it is characterized in that, comprises the following steps:
Receive after enabling signal, controller is controlled the temperature value that the first temperature-detecting device detects the first oil circuit, and exports the first temperature value, controls the temperature value that the second temperature-detecting device detects the second oil circuit simultaneously, and exports the second temperature value;
Described controller receives described the first temperature value and described the second temperature value, and carries out data processing, according to data processed result, judges whether to carry out all oil operations;
Wherein, data processing is for calculating the temperature difference of described the first temperature value and described the second temperature value, when the described temperature difference is more than or equal to preset temperature value, and described difference is while continuing to be more than or equal to described preset temperature value to default duration, and described controller sends and carries out equal oily operational order.
9. the control method of multi-gang air-conditioner off-premises station according to claim 8, is characterized in that,
Described preset temperature value is more than or equal to 5 ℃.
10. the control method of multi-gang air-conditioner off-premises station according to claim 8, is characterized in that,
Described default duration is more than or equal to 30 minutes.
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| WO2023050820A1 (en) * | 2021-09-28 | 2023-04-06 | 青岛海尔中央空调有限公司 | Control method for multi-split air conditioning unit |
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