CN103486785A - Oil return control method and device of variable-frequency air-conditioner compressor - Google Patents
Oil return control method and device of variable-frequency air-conditioner compressor Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 210
- 238000004378 air conditioning Methods 0.000 claims abstract description 64
- 238000013507 mapping Methods 0.000 claims abstract description 15
- 235000003642 hunger Nutrition 0.000 claims description 15
- 230000037351 starvation Effects 0.000 claims description 15
- 239000003921 oil Substances 0.000 abstract description 257
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000010726 refrigerant oil Substances 0.000 abstract 1
- 238000005057 refrigeration Methods 0.000 description 55
- 230000001276 controlling effect Effects 0.000 description 30
- 239000003507 refrigerant Substances 0.000 description 23
- 230000003134 recirculating effect Effects 0.000 description 13
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000010729 system oil Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses an oil return control method and device of a variable-frequency air-conditioner compressor. The oil return control method of the variable-frequency air-conditioner compressor includes: acquiring liquid level height value in an oil separator; determining target running frequency of the compressor corresponding to the liquid level height value according to mapping relation of the preset liquid level height value and the running frequency of the compressor; switching the current running frequency of the compressor to the determined target running frequency of the compressor. By the oil return control method of the variable-frequency air-conditioner compressor in the embodiment, frequency of the compressor is correspondingly adjusted according to the oil storage state of the oil separator, the purpose of regulating refrigerant oil circulation in an air-conditioning system is achieved, and therefore, affection on working condition of the compressor due to instable oil return of the air-conditioning system is avoided.
Description
Technical field
The present invention relates to the air conditioner controlling technology field, relate in particular to a kind of method for controlling oil return and device thereof of frequency converting air-conditioner compressor.
Background technology
Convertible frequency air-conditioner is to have increased a frequency converter on the structure of conventional air-conditioning.Compressor is the heart of air-conditioning, and its rotating speed directly has influence on the service efficiency of air-conditioning, and frequency converter is exactly for controlling and adjust the control system of compressor rotary speed, makes it all the time in best rotating speed state, thereby improves Energy Efficiency Ratio.Compressor is in the process by the gaseous coolant compression, and inner each moving component is lubricated needs the use refrigeration oil, otherwise compressor can be because of serious wearing and tearing and overheated the damage.The refrigerant of discharging from exhaust outlet of compressor can carry the part refrigeration oil, therefore, usually adopts oil eliminator in existing air-conditioning system, after refrigeration oil is separated from refrigerant, flows in compressor.
But there is following problem in the oil return of existing convertible frequency air-conditioner.Unpredictability due to the compressor operation operating mode of convertible frequency air-conditioner, the operating frequency of compressor is sometimes greatly sometimes little, when the operating frequency of compressor is large the air-conditioning system oil return large, little in the operating frequency hour oil return of compressor, therefore, cause the air-conditioning system recirculating oil quantity unstable.When the refrigeration oil of storing is too much, illustrate that in compressor, refrigeration oil is few in oil eliminator, thereby parts depreciation in compressor is strengthened, compressor operating easily produces fault.And in oil eliminator without when oil, illustrate that the refrigeration oil carried in the refrigerant of circulation is many, cold-producing medium carries a large amount of refrigeration oils and enters in compressor, produces back the liquid phenomenon, compressor easily causes compressor to rush the cylinder fault in the refrigeration oil compression process by liquid.
Summary of the invention
Main purpose of the present invention is to provide a kind of method for controlling oil return and device thereof of frequency converting air-conditioner compressor, is intended to avoid the air-conditioning system oil return unstable and affect compressor normal operation.
In order to achieve the above object, the present invention proposes a kind of method for controlling oil return of frequency converting air-conditioner compressor, comprises the following steps:
Obtain the liquid level value in oil eliminator;
According to the mapping relations of the running frequency of default liquid level value and compressor, determine the object run frequency of the compressor that the described liquid level value that gets is corresponding;
The current running frequency of compressor is switched to the object run frequency of definite compressor.
Preferably, the mapping relations of the liquid level value that described basis is default and the running frequency of compressor, the step of the object run frequency of the compressor that definite described liquid level value got is corresponding specifically comprises:
Whether the described liquid level value that judgement gets is less than the first preset height threshold value;
If the described liquid level value got is less than the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the first predeterminated frequency.
The step whether described liquid level value that preferably, described judgement gets is less than the first preset height threshold value also comprises afterwards:
If the described liquid level value got is more than or equal to the first preset height threshold value, judge whether described liquid level value is more than or equal to the second preset height threshold value;
If described liquid level value is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency, wherein, the second predeterminated frequency is greater than described the first predeterminated frequency;
If described liquid level value is less than the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
Preferably, the described current running frequency by compressor also comprises after switching to the step of object run frequency of definite compressor:
When the duration that described liquid level value is less than the first preset height threshold value is greater than the Preset Time threshold value, being connected between the outlet that disconnects described oil eliminator and the air inlet of described compressor;
Current in the oil starvation state to the external prompt air-conditioning system.
Preferably, the mapping relations of the liquid level value that described basis is default and the running frequency of compressor, the step of the object run frequency of the compressor that definite described liquid level value got is corresponding specifically comprises:
Whether the described liquid level value that judgement gets is more than or equal to the second preset height threshold value;
If the described liquid level value got is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency.
The step whether described liquid level value that preferably, described judgement gets is more than or equal to the second preset height threshold value also comprises afterwards:
When if the described liquid level value got is less than the second preset height threshold value, judge whether described liquid level value is less than the first preset height threshold value;
If the described liquid level value got is less than the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the first predeterminated frequency, wherein, the second predeterminated frequency is greater than described the first predeterminated frequency;
If the described liquid level value got is more than or equal to the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
The present invention further also proposes a kind of oil return control device of frequency converting air-conditioner compressor, comprising:
Acquisition module, for obtaining the liquid level value of oil eliminator;
Determination module, for the mapping relations of the running frequency of the liquid level value according to default and compressor, determine the object run frequency of the compressor that the described liquid level value that gets is corresponding;
Handover module, switch to the object run frequency of definite compressor for the current running frequency by compressor.
Preferably, whether the described liquid level value that described determination module gets specifically for judgement is less than the first preset height threshold value, when the described liquid level value when getting is less than the first preset height threshold value, the object run frequency of the compressor that definite described liquid level value got is corresponding is the first predeterminated frequency.
Preferably, when described determination module also is more than or equal to the first preset height threshold value for the described liquid level value when getting, judge whether described liquid level value is more than or equal to the second preset height threshold value; If described liquid level value is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency; If described liquid level value is less than the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
Preferably, the oil return control device of described frequency converting air-conditioner compressor also comprises:
Switch module, while for the duration that is less than the first preset height threshold value when described liquid level value, being greater than the Preset Time threshold value, being connected between the outlet that disconnects described oil eliminator and the air inlet of described compressor;
Reminding module, for current in the oil starvation state to the external prompt air-conditioning system.
Whether the described liquid level value that preferably, described determination module gets specifically for judgement is more than or equal to the second preset height threshold value; If the described liquid level value got is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency.
Preferably, when described determination module also is less than the second preset height threshold value for the described liquid level value when getting, judge whether described liquid level value is less than the first preset height threshold value; If the described liquid level value got is less than the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the first predeterminated frequency; If the described liquid level value got is more than or equal to the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
The method for controlling oil return of the frequency converting air-conditioner compressor that the present invention proposes, at first obtain the liquid level value in oil eliminator, mapping relations according to the running frequency of default liquid level value and compressor, the object run frequency of the compressor that definite liquid level value got is corresponding, the current running frequency of compressor is switched to the object run frequency of definite compressor, thereby the oil storage state according to oil eliminator realized is to adjust accordingly the frequency of compressor, reach the purpose of regulating refrigeration oil circulation in air-conditioning system, thereby avoid because of the unstable working condition that has influence on compressor of the recirculating oil quantity of air-conditioning system.
The accompanying drawing explanation
The schematic flow sheet of the first embodiment of the oil return control device that Fig. 1 is frequency converting air-conditioner compressor of the present invention;
Fig. 2 is the structural representation of the air-conditioning system of the method for controlling oil return of use frequency converting air-conditioner compressor of the present invention.
According to the mapping relations of the running frequency of default liquid level value and compressor, determine the schematic flow sheet of the object run frequency of the compressor that the described liquid level value that gets is corresponding described in the oil return control device that Fig. 3 is frequency converting air-conditioner compressor of the present invention;
The schematic flow sheet of the second embodiment of the method for controlling oil return that Fig. 4 is frequency converting air-conditioner compressor of the present invention;
The schematic flow sheet of the 3rd embodiment of the method for controlling oil return that Fig. 5 is frequency converting air-conditioner compressor of the present invention;
The schematic flow sheet of the 4th embodiment of the method for controlling oil return that Fig. 6 is frequency converting air-conditioner compressor of the present invention;
The schematic flow sheet of the 5th embodiment of the method for controlling oil return that Fig. 7 is frequency converting air-conditioner compressor of the present invention;
The structural representation of the first embodiment of the oil return control device that Fig. 8 is frequency converting air-conditioner compressor of the present invention;
The structural representation of the second embodiment of the oil return control device that Fig. 9 is frequency converting air-conditioner compressor of the present invention.
The realization of the object of the invention, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
The specific embodiment
Below in conjunction with drawings and the specific embodiments, with regard to technical scheme of the present invention, be described further.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
See figures.1.and.2, the schematic flow sheet of the first embodiment of the method for controlling oil return that Fig. 1 is frequency converting air-conditioner compressor of the present invention, Fig. 2 is the structural representation of the air-conditioning system of the method for controlling oil return of use frequency converting air-conditioner compressor of the present invention.
The present invention proposes the first embodiment of the method for controlling oil return of frequency converting air-conditioner compressor.In the present embodiment, the method for controlling oil return of frequency converting air-conditioner compressor comprises the following steps:
Step S10, obtain the liquid level value in oil eliminator;
In the present embodiment, for the method for controlling oil return of frequency converting air-conditioner compressor better is described, take and be applied to the air-conditioning system shown in Fig. 2 and describe as example, certainly, the method for controlling oil return of this frequency converting air-conditioner compressor is not limited to the air-conditioning system shown in Fig. 2, also can reasonably be applied to the air-conditioning system of other structure.Air-conditioning system shown in Fig. 2 comprises compressor 1, oil eliminator 2, cross valve 3, condenser 4, throttle capillary tube 5, the first stop valve 6, evaporimeter 7, the second stop valve 8, gas-liquid separator 9, oil return capillary 10, magnetic valve 11 and pipeline 12.Air-conditioning system is when refrigeration mode, and the circulation of cold-producing medium is as shown in the direction of arrow in figure.
Take the air-conditioning system shown in Fig. 2 in refrigeration mode the specific works principle as example explanation oil return.The gaseous refrigerant of the HTHP of discharging from the blast pipe of compressor 1 is carrying vaporific refrigeration oil, in the air inlet pipe 2a of oil eliminator 2 enters into oil eliminator 2, by the centrifugation in oil eliminator 2, the refrigeration oil of separating is stored in the bottom of oil eliminator 2, simultaneously, isolated gaseous refrigerant enters into condenser 4 through the blast pipe 2b of oil eliminator 2.When magnetic valve 11 is open mode, refrigeration oil enters into gas-liquid separator 9 from the oil return pipe 2c of oil eliminator 2 through oil return capillary 10.The cold-producing medium (this part cold-producing medium is that the isolated cold-producing medium of oil eliminator 2 enters in evaporimeter 7 through cross valve 3, condenser 4 successively) flowed out from evaporimeter 7 enters in gas-liquid separator 9, centrifugation by gas-liquid separator 9, the cold-producing medium of isolated gaseous state can carry a small amount of refrigeration oil and enter in compressor 1, to guarantee the normal operation of compressor 1.
Step S20, according to the mapping relations of the running frequency of default liquid level value and compressor, determine the object run frequency of the compressor that the described liquid level value that gets is corresponding;
Step S30, switch to the current running frequency of compressor the object run frequency of definite compressor.
Particularly, in the present embodiment, with reference to Fig. 3, step S20 comprises the following steps:
Step S21, whether the described liquid level value that judgement gets is less than the first preset height threshold value; If the described liquid level value got is less than the first preset height threshold value, perform step S22; If the described liquid level value got is less than the first preset height threshold value, perform step S23.
Step S22, the object run frequency of the compressor that definite described liquid level value got is corresponding is the first predeterminated frequency.
Step S23, the current running frequency that the object run frequency of the compressor that definite described liquid level value got is corresponding is compressor.
The first predeterminated frequency is in a lower frequency for the rated frequency of air-conditioning.Particularly, in the present embodiment, the air-conditioning of 5 power of take is the example explanation, and the first predeterminated frequency is a certain frequency that is less than 60Hz.The first preset height threshold value is the preset value a little more than the minimum warning liquid level of oil eliminator, simultaneously, the first preset height threshold value will be lower than air-conditioning system the liquid level value under normal operating conditions.The present embodiment is with the oil return of air-conditioning system when the normal operating conditions, and the liquid level value is made as S2, and it is the example explanation that the first preset height threshold value is made as S1.Under normal circumstances, the liquid level of oil eliminator is that fluctuation range is not too large in the fluctuation of S2 left and right to air-conditioning system.Particularly, S1 is according to the value of S2, the capacity of oil eliminator, and the synthetic settings such as size of compressor refrigerating capacity, before guaranteeing occurring limit oil starvation state in compressor, just by handover module, the frequency of compressor is switched to a lower frequency.
When the liquid level value got is less than the first preset height threshold value, the reason of the current running frequency of compressor being turned down to (adjusting to the first predeterminated frequency) is as follows: in air-conditioning system, the size of recirculating oil quantity is relevant with refrigerant system capacity size and oil return diameter capillaceous etc.And the refrigerant system capacity size is relevant with the running frequency of compressor.The running frequency that is compressor is higher, and refrigerant system capacity is larger, and the pressure differential at oil return capillary two ends is larger, and recirculating oil quantity is larger.Oil return diameter capillaceous is larger, and recirculating oil quantity is larger.In addition, the separative efficiency of oil eliminator is relevant with the running frequency of compressor.The running frequency of compressor is higher, and the refrigerant circulation that exhaust outlet of compressor is discharged is faster, and the separative efficiency of oil eliminator is lower.In addition, the running frequency of compressor is higher, the temperature of the cold-producing medium that the exhaust outlet of compressor is discharged is higher, and refrigerant temperature is higher, the solubility of refrigeration oil in cold-producing medium is larger, more be not easy to reach hypersaturated state, the cold-producing medium that carries refrigeration oil enters in oil eliminator, and the amount of isolated refrigeration oil is less.When the liquid level value got is less than S1, illustrate that the oil in oil eliminator now is less.Now, control compressor with a lower frequency operation (i.e. the first predeterminated frequency), make on the one hand oil return speed slow down (because the pressure differential at oil return capillary two ends reduces, the freezing oil mass that oil eliminator enters in compressor reduces), improved on the other hand the oil eliminator separative efficiency (because refrigerant circulation speed slows down and refrigeration oil solubility diminishes, isolated refrigeration oil increases), thereby make liquid level value in oil eliminator can reach a zone of reasonableness, to guarantee the normal operation of compressor.
The method for controlling oil return of the frequency converting air-conditioner compressor that the present embodiment proposes, at first obtain the liquid level value in oil eliminator, mapping relations according to the running frequency of default liquid level value and compressor, the object run frequency of the compressor that definite liquid level value got is corresponding, the current running frequency of compressor is switched to the object run frequency of definite compressor, thereby the oil storage state according to oil eliminator realized is to adjust accordingly the frequency of compressor, reach the purpose of regulating refrigeration oil circulation in air-conditioning system, thereby avoid because of the unstable working condition that has influence on compressor of air-conditioning system recirculating oil quantity.
With reference to Fig. 4, the schematic flow sheet of the second embodiment of the method for controlling oil return that Fig. 4 is frequency converting air-conditioner compressor of the present invention.
Based on above-described embodiment, the present invention proposes the second embodiment of the method for controlling oil return of frequency converting air-conditioner compressor.The present embodiment is different from above-described embodiment, in the present embodiment, after step, also comprises:
Step S24, when the duration that described liquid level value is less than the first preset height threshold value is greater than the Preset Time threshold value, being connected between the outlet that disconnects described oil eliminator and the air inlet of described compressor;
Step S25, current in the oil starvation state to the external prompt air-conditioning system.
Particularly, in the present embodiment, can set the Preset Time threshold value for the air-conditionings of 5 is 2 minutes.When the duration that the liquid level value is less than the first preset height threshold value is greater than 2 minutes, the compressor inner oil shortage is described, now, only rely on the running frequency of adjusting compressor not enough so that enough refrigeration oils enter in compressor, pointing out the current air-conditioning system of user is the oil starvation state.The user can inject refrigeration oil by the oil filler point arranged on air-conditioning system.Take Fig. 2 when example illustrates, but when the oil starvation state shut electromagnetic valve, the refrigeration oil in oil eliminator can not be entered in compressor.Particularly, when air-conditioning system is the oil starvation state, can pass through audio alert, light warning or display display alarm information etc.
The method for controlling oil return of the frequency converting air-conditioner compressor that the present embodiment proposes, the duration that is less than the first preset height threshold value in the liquid level value is while being greater than the Preset Time threshold value, being connected between the outlet that disconnects oil eliminator and the air inlet of compressor, then current in the oil starvation state to the external prompt air-conditioning system, thereby air-conditioning system is being lacked under freezing oil condition, the prompting user supplements refrigeration oil, avoids because of the not enough situation that causes parts depreciation in compressor of refrigeration oil.
With reference to Fig. 5, the schematic flow sheet of the 3rd embodiment of the method for controlling oil return that Fig. 5 is frequency converting air-conditioner compressor of the present invention.In order to simplify accompanying drawing, the present embodiment be take based on the first embodiment as the example explanation of drawing, if based on the second embodiment, correspondingly after the step S22 of the present embodiment adds that step S24, step S24 get final product.
Based on above-described embodiment, the present invention proposes the second embodiment of the method for controlling oil return of frequency converting air-conditioner compressor.The present embodiment is different from above-described embodiment, in the present embodiment, step S23 is being replaced with to following steps,
Step S26, judge whether described liquid level value is more than or equal to the second preset height threshold value; If described liquid level value is more than or equal to the second preset height threshold value, perform step S27; If the liquid level value is less than the second preset height threshold value, perform step S28.
Step S27, the object run frequency of the compressor that definite described liquid level value got is corresponding is the second predeterminated frequency;
The second predeterminated frequency is greater than described the first predeterminated frequency.
Step S28, the object run frequency of the compressor that definite described liquid level value got is corresponding is rated frequency.
The second preset height threshold value is higher than the fluid value of oil return under normal condition of air-conditioning system.In the present embodiment, setting the second preset height threshold value is S3, and S2 is between S3 and S1.Particularly, S3 will be according to the model of air-conditioning, the synthetic settings such as size of oil eliminator.
When the liquid level value that gets oil eliminator is more than or equal to the second preset height threshold value, illustrate that the refrigeration oil quantity stored in oil eliminator is more, the refrigeration oil in compressor is less.Now, need suitably heighten the running frequency of compressor, to improve the oil return efficiency of air-conditioning system, refrigeration oil be entered in compressor.But, when the liquid level at oil eliminator when S3 is above, if adjust too high by the running frequency of compressor, the oil return speed of air-conditioning system is too fast, cause a large amount of liquid refrigeration oils to enter in compressor, compressor inner product oil too much, may cause compressor the cylinder phenomenon to occur rushing (in the ideal operation situation, cold-producing medium can carry a small amount of liquid refrigeration oil, and the air inlet of compressed machine enters in compressor and makes part in compressor keep lubricated).Therefore, in the present embodiment, setting the second predeterminated frequency for the air-conditioning of 5 is 60Hz, to reach optimum oil return state.
In addition, the rated frequency of compressor is determined according to air-conditioning system indoor set and the residing ability integration of off-premises station.The air-conditioning of different model, its rated frequency is not identical yet.In theory, the running frequency of frequency converting air-conditioner compressor is between 25Hz～130Hz, but, the running frequency of compressor is not each frequency change between 25Hz～130Hz, but given a plurality of rated frequencies are switched between 25Hz～130Hz, according to outside temperature environment situation, operating mode etc., determine neatly the rated frequency of compressor.Take 5 air-conditionings as the example explanation, and rated frequency has 30Hz, 45Hz, 54Hz, 62Hz, 78Hz, 85Hz etc.
When the liquid level value of oil eliminator is between the second preset height threshold value and the first preset height threshold value, illustrate that the oil of storing in oil eliminator is in a more rational scope, now, need not consider the oil return problem, only use and the current running frequency of compressor is remained on to rated frequency get final product, in other words, now, the adjustment of compressor operating frequency need not be considered the concrete liquid level of oil eliminator, the liquid level that only is used in oil eliminator is more than or equal to S3, or the liquid level of oil eliminator is while being less than S1, the current running frequency of compressor need to be adjusted accordingly, to guarantee the oil return stable operation of air-conditioning system, thereby guarantee the normal operation of compressor.
With reference to Fig. 6, the schematic flow sheet of the 4th embodiment of the method for controlling oil return that Fig. 6 is frequency converting air-conditioner compressor of the present invention.
Based on above-mentioned the first embodiment, the present invention proposes the 4th embodiment of the method for controlling oil return of frequency converting air-conditioner compressor.In the present embodiment, step S20 specifically comprises:
Step S201, whether the described liquid level value that judgement gets is more than or equal to the second preset height threshold value; If the described liquid level value got is more than or equal to the second preset height threshold value, perform step S202; If the described liquid level value got is less than the second preset height threshold value, perform step S203.
Step S202, the object run frequency of the compressor that definite described liquid level value got is corresponding is the second predeterminated frequency;
Step S203, the current running frequency that the object run frequency of the compressor that definite described liquid level value got is corresponding is compressor.
The second preset height threshold value is higher than the fluid value of oil return under normal condition of air-conditioning system.When the liquid level value is more than or equal to the second preset height threshold value, illustrate that the oil mass of storing in oil eliminator is too much, now, need suitably heighten the running frequency of compressor, to improve the oil return efficiency of air-conditioning system, refrigeration oil is entered in compressor.But, when the liquid level at oil eliminator more than S3, if the running frequency of compressor is too high, oil return speed is too fast, cause a large amount of liquid refrigeration oils to enter in compressor, compressor inner product oil too much, may cause compressor the cylinder phenomenon to occur rushing (in the ideal operation situation, cold-producing medium carries a small amount of liquid refrigeration oil, and the air inlet of compressed machine enters in compressor and makes part in compressor keep lubricated).Therefore, in the present embodiment, setting the second predeterminated frequency for the air-conditioning of 5 is 60Hz, to reach optimum oil return state.
The method for controlling oil return of the frequency converting air-conditioner compressor that the present embodiment proposes, when the liquid level value is more than or equal to the second preset height threshold value, the object run frequency of the compressor that definite liquid level value got is corresponding is the second predeterminated frequency, thereby avoids the oil mass because storing in oil eliminator too much to cause the very few compressor inner body wearing and tearing that cause of refrigeration oil in compressor.
With reference to Fig. 7, the schematic flow sheet of the 5th embodiment of the method for controlling oil return that Fig. 7 is frequency converting air-conditioner compressor of the present invention.
Based on above-mentioned the 4th embodiment, the present invention proposes the 5th embodiment of the method for controlling oil return of frequency converting air-conditioner compressor.The present embodiment is different from above-mentioned the 4th embodiment, and step S203 is replaced with to following steps:
Step S204, judge whether described liquid level value is less than the first preset height threshold value; If the described liquid level value got is less than the first preset height threshold value, perform step S205; If the described liquid level value got is more than or equal to the first preset height threshold value, perform step S206;
Step S205, the object run frequency of the compressor that definite described liquid level value got is corresponding is the first predeterminated frequency;
Step S206, the object run frequency of the compressor that definite described liquid level value got is corresponding is rated frequency.
The first predeterminated frequency is greater than the second predeterminated frequency.
Particularly, the first preset height threshold value is the preset value a little more than the minimum warning liquid level of oil eliminator, simultaneously, the first preset height threshold value will be lower than air-conditioning system the liquid level value under normal operating conditions.The present embodiment is with when normal operation, and the liquid level value is made as S2, and it is the example explanation that the first preset height threshold value is made as S1.Under normal circumstances, in oil eliminator, be that fluctuation range is not too large in the fluctuation of S2 left and right.Particularly, S1 is according to the value of S2, and the synthetic settings such as size of compressor refrigerating capacity, before guaranteeing occurring limit oil starvation state in compressor, just by handover module, the frequency of compressor is adjusted to a lower frequency.Particularly, in the present embodiment, the air-conditioning of 5 power of take is the example explanation, and the first predeterminated frequency is a certain frequency that is less than 60Hz, and the first predeterminated frequency is 60Hz.
When whether the liquid level value got is less than the first preset height threshold value, the reason that the running frequency of compressor is turned down is as follows: in air-conditioning system, the size of recirculating oil quantity is relevant with refrigerant system capacity size and oil return diameter capillaceous etc.And the refrigerant system capacity size is relevant with the running frequency of compressor.The running frequency that is compressor is higher, and refrigerant system capacity is larger, and the pressure differential at oil return capillary two ends is larger, and recirculating oil quantity is larger.Oil return diameter capillaceous is larger, and recirculating oil quantity is larger.In addition, the separative efficiency of oil eliminator is relevant with the running frequency of compressor.The running frequency of compressor is higher, and the refrigerant circulation that exhaust outlet of compressor is discharged is faster, and the separative efficiency of oil eliminator is lower.In addition, the running frequency of compressor is higher, and the temperature of the cold-producing medium that exhaust outlet of compressor is discharged is higher, and refrigerant temperature is higher, and the solubility of refrigeration oil in cold-producing medium is larger, more is not easy to reach hypersaturated state, and isolated refrigeration oil is less.When the liquid level value got is less than S1, illustrate that the oil in oil eliminator now is less, now, control compressor with a lower frequency operation (i.e. the first predeterminated frequency), make on the one hand oil return speed slow down (because the pressure differential at oil return capillary two ends reduces, the freezing oil mass that oil eliminator enters in compressor reduces), (refrigerant circulation speed slows down and refrigeration oil solubility diminishes to have improved on the other hand the oil eliminator separative efficiency, isolated refrigeration oil increases), thus make liquid level value in oil eliminator can reach a zone of reasonableness.
In addition, when the duration that the liquid level value is less than the first preset height threshold value is greater than the Preset Time threshold value, being connected between the outlet that disconnects described oil eliminator and the air inlet of described compressor, and current in the oil starvation state to the external prompt air-conditioning system.
Particularly, in the present embodiment, can set the Preset Time threshold value for the air-conditionings of 5 is 2 minutes.When the duration that the liquid level value is less than the first preset height threshold value is greater than 2 minutes, the compressor inner oil shortage is described, now, only rely on the running frequency of adjusting compressor not enough so that enough refrigeration oils enter in compressor, pointing out the current air-conditioning system of user is the oil starvation state.The user can inject refrigeration oil by the oil filler point arranged on air-conditioning system, thereby has avoided because of the not enough situation that causes parts depreciation in compressor of refrigeration oil.
The method for controlling oil return of the frequency converting air-conditioner compressor that the present embodiment proposes, by the first preset height threshold value and the second preset height threshold value are set, when the liquid level value of oil eliminator is more than or equal to the second preset height threshold value, the current running frequency of compressor is switched to the second predeterminated frequency, the object run frequency of the compressor that definite described liquid level value got is corresponding is the second predeterminated frequency, thereby has avoided the oil mass because storing in oil eliminator too much to cause the very few compressor inner body wearing and tearing that cause of refrigeration oil in compressor.When the liquid level value of oil eliminator is less than the first preset height threshold value, the current running frequency of compressor is switched to the first predeterminated frequency, avoid causing compressor to rush the cylinder accident because a large amount of refrigeration oils enters in compressor.
The present invention further also proposes a kind of oil return control device of frequency converting air-conditioner compressor.
With reference to Fig. 8, the structural representation of the first embodiment of the oil return control device that Fig. 8 is frequency converting air-conditioner compressor of the present invention.
The present invention proposes the first embodiment of the oil return control device of frequency converting air-conditioner compressor.In the present embodiment, the oil return control device of frequency converting air-conditioner compressor comprises:
Particularly, the present embodiment specifically proposes the specific embodiments of two kinds of determination modules.
The first scheme is: whether the described liquid level value that determination module gets specifically for judgement is less than the first preset height threshold value, when the described liquid level value when getting is less than the first preset height threshold value, the object run frequency of the compressor that definite described liquid level value got is corresponding is the first predeterminated frequency.
When determination module also is more than or equal to the first preset height threshold value for the described liquid level value when getting, judge whether described liquid level value is more than or equal to the second preset height threshold value; If described liquid level value is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency; If described liquid level value is less than the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
First scheme is: whether the described liquid level value that determination module gets specifically for judgement is more than or equal to the second preset height threshold value; If the described liquid level value got is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency.
When determination module also is less than the second preset height threshold value for the described liquid level value when getting, judge whether described liquid level value is less than the first preset height threshold value; If the described liquid level value got is less than the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the first predeterminated frequency; If the described liquid level value got is more than or equal to the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
The difference of the first scheme and first scheme is, in the first scheme, determination module first judges whether the liquid level value is less than the first preset height threshold value, after judge whether to be more than or equal to the second preset height threshold value.And, in first scheme, determination module first judges whether the liquid level value is more than or equal to the second preset height threshold value, after judge whether to be less than the first preset height threshold value.
When whether the liquid level value got is less than the first preset height threshold value, the reason of the running frequency of compressor suitably being turned down to (the first predeterminated frequency with respect to for smaller) is as follows: in air-conditioning system, the size of recirculating oil quantity is relevant with refrigerant system capacity size and oil return diameter capillaceous etc.And the refrigerant system capacity size is relevant with the running frequency of compressor.The running frequency that is compressor is higher, and refrigerant system capacity is larger, and the pressure differential at oil return capillary two ends is larger, and recirculating oil quantity is larger.Oil return diameter capillaceous is larger, and recirculating oil quantity is larger.In addition, the separative efficiency of oil eliminator is relevant with the running frequency of compressor.The running frequency of compressor is higher, and the refrigerant circulation that exhaust outlet of compressor is discharged is faster, and the separative efficiency of oil eliminator is lower.In addition, the running frequency of compressor is higher, and the temperature of the cold-producing medium that exhaust outlet of compressor is discharged is higher, and refrigerant temperature is higher, and the solubility of refrigeration oil in cold-producing medium is larger, more is not easy to reach hypersaturated state, and isolated refrigeration oil is less.When the liquid level value got is less than S1, illustrate that the oil in oil eliminator now is less, now, control compressor with a lower frequency operation (i.e. the first predeterminated frequency), make on the one hand oil return speed slow down (because the pressure differential at oil return capillary two ends reduces, the freezing oil mass that oil eliminator enters in compressor reduces), improved on the other hand the oil eliminator separative efficiency (because refrigerant circulation speed slows down and refrigeration oil solubility diminishes, isolated refrigeration oil increases), thus make liquid level value in oil eliminator can reach a zone of reasonableness.
Be more than or equal to the second preset height threshold value (in the present embodiment if get the liquid level value of oil eliminator, setting the second preset height threshold value is S3) time, illustrate that the refrigeration oil quantity stored in oil eliminator is more, now, need suitably heighten the running frequency of compressor, to improve the oil return efficiency of air-conditioning system, refrigeration oil is entered in compressor.But, when the liquid level at oil eliminator more than S3, if the running frequency of compressor is too high, oil return speed is too fast, cause a large amount of liquid refrigeration oils to enter in compressor, compressor inner product oil too much, may cause compressor the cylinder phenomenon to occur rushing (in the ideal operation situation, cold-producing medium carries a small amount of liquid refrigeration oil, and the air inlet of compressed machine enters in compressor and makes part in compressor keep lubricated).
The oil return control device of the frequency converting air-conditioner compressor that the present embodiment proposes, acquisition module 10 obtains the liquid level value in oil eliminator, determination module 20 is according to the mapping relations of the running frequency of default liquid level value and compressor, the object run frequency of the compressor that definite described liquid level value got is corresponding, handover module 30 switches to the current running frequency of compressor the object run frequency of definite compressor, thereby the oil storage state according to oil eliminator realized is to adjust accordingly the frequency of compressor, reach the purpose of regulating refrigeration oil circulation in air-conditioning system, thereby avoid because of the unstable working condition that has influence on compressor of the recirculating oil quantity of air-conditioning system.
With reference to Fig. 9, the structural representation of the second embodiment of the oil return control device that Fig. 9 is frequency converting air-conditioner compressor of the present invention.
Further, the present invention proposes the second embodiment of the oil return control device of frequency converting air-conditioner compressor.In the present embodiment, the oil return control device of this frequency converting air-conditioner compressor also comprises:
Reminding module 50, for current in the oil starvation state to the external prompt air-conditioning system.
The oil return control device of the frequency converting air-conditioner compressor that the present embodiment proposes, the duration that is less than the first preset height threshold value in the liquid level value is while being greater than the Preset Time threshold value, being connected between the outlet that switch module 40 disconnects described oil eliminator and the air inlet of described compressor, reminding module 50 is current in the oil starvation state to the external prompt air-conditioning system, thereby make air-conditioning system in lacking under freezing oil condition, the prompting user supplements refrigeration oil, avoids because of the not enough situation that causes parts depreciation in compressor of refrigeration oil.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure transformation that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (12)
1. the method for controlling oil return of a frequency converting air-conditioner compressor, is characterized in that, comprises the following steps:
Obtain the liquid level value in oil eliminator;
According to the mapping relations of the running frequency of default liquid level value and compressor, determine the object run frequency of the compressor that the described liquid level value that gets is corresponding;
The current running frequency of compressor is switched to the object run frequency of definite compressor.
2. the method for controlling oil return of frequency converting air-conditioner compressor as claimed in claim 1, it is characterized in that, the mapping relations of the liquid level value that described basis is default and the running frequency of compressor, the step of the object run frequency of the compressor that definite described liquid level value got is corresponding specifically comprises:
Whether the described liquid level value that judgement gets is less than the first preset height threshold value;
If the described liquid level value got is less than the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the first predeterminated frequency.
3. the method for controlling oil return of frequency converting air-conditioner compressor as claimed in claim 2, is characterized in that, the step whether described liquid level value that described judgement gets is less than the first preset height threshold value also comprises afterwards:
If the described liquid level value got is more than or equal to the first preset height threshold value, judge whether described liquid level value is more than or equal to the second preset height threshold value;
If described liquid level value is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency, wherein, the second predeterminated frequency is greater than described the first predeterminated frequency;
If described liquid level value is less than the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
4. the method for controlling oil return of frequency converting air-conditioner compressor as claimed in claim 2 or claim 3, is characterized in that, the described current running frequency by compressor also comprises after switching to the step of object run frequency of definite compressor:
When the duration that described liquid level value is less than the first preset height threshold value is greater than the Preset Time threshold value, being connected between the outlet that disconnects described oil eliminator and the air inlet of described compressor;
Current in the oil starvation state to the external prompt air-conditioning system.
5. the method for controlling oil return of frequency converting air-conditioner compressor as claimed in claim 1, it is characterized in that, the mapping relations of the liquid level value that described basis is default and the running frequency of compressor, the step of the object run frequency of the compressor that definite described liquid level value got is corresponding specifically comprises:
Whether the described liquid level value that judgement gets is more than or equal to the second preset height threshold value;
If the described liquid level value got is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency.
6. the method for controlling oil return of frequency converting air-conditioner compressor as claimed in claim 5, is characterized in that, the step whether described liquid level value that described judgement gets is more than or equal to the second preset height threshold value also comprises afterwards:
When if the described liquid level value got is less than the second preset height threshold value, judge whether described liquid level value is less than the first preset height threshold value;
If the described liquid level value got is less than the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the first predeterminated frequency, wherein, the second predeterminated frequency is greater than described the first predeterminated frequency;
If the described liquid level value got is more than or equal to the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
7. the oil return control device of a frequency converting air-conditioner compressor, is characterized in that, comprising:
Acquisition module, for obtaining the liquid level value of oil eliminator;
Determination module, for the mapping relations of the running frequency of the liquid level value according to default and compressor, determine the object run frequency of the compressor that the described liquid level value that gets is corresponding;
Handover module, switch to the object run frequency of definite compressor for the current running frequency by compressor.
8. the oil return control device of frequency converting air-conditioner compressor as claimed in claim 7, it is characterized in that, whether the described liquid level value that described determination module gets specifically for judgement is less than the first preset height threshold value, when the described liquid level value when getting is less than the first preset height threshold value, the object run frequency of the compressor that definite described liquid level value got is corresponding is the first predeterminated frequency.
9. the oil return control device of frequency converting air-conditioner compressor as claimed in claim 8, it is characterized in that, when described determination module also is more than or equal to the first preset height threshold value for the described liquid level value when getting, judge whether described liquid level value is more than or equal to the second preset height threshold value; If described liquid level value is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency; If described liquid level value is less than the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
10. the oil return control device of frequency converting air-conditioner compressor as claimed in claim 8 or 9, is characterized in that, also comprises:
Switch module, while for the duration that is less than the first preset height threshold value when described liquid level value, being greater than the Preset Time threshold value, being connected between the outlet that disconnects described oil eliminator and the air inlet of described compressor;
Reminding module, for current in the oil starvation state to the external prompt air-conditioning system.
11. the oil return control device of frequency converting air-conditioner compressor as claimed in claim 7, is characterized in that, whether the described liquid level value that described determination module gets specifically for judgement is more than or equal to the second preset height threshold value; If the described liquid level value got is more than or equal to the second preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the second predeterminated frequency.
12. the oil return control device of frequency converting air-conditioner compressor as claimed in claim 11, it is characterized in that, when described determination module also is less than the second preset height threshold value for the described liquid level value when getting, judge whether described liquid level value is less than the first preset height threshold value; If the described liquid level value got is less than the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is the first predeterminated frequency; If the described liquid level value got is more than or equal to the first preset height threshold value, determine that the object run frequency of the compressor that the described liquid level value get is corresponding is rated frequency.
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| CN113899114A (en) * | 2021-11-15 | 2022-01-07 | 宁波奥克斯电气股份有限公司 | Air conditioner and oil return control method and device |
| CN115654645A (en) * | 2022-10-18 | 2023-01-31 | 珠海格力电器股份有限公司 | Multi-split oil return control method and device and multi-split system |
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