CN115978738A - Oil return control method and air conditioning system - Google Patents
Oil return control method and air conditioning system Download PDFInfo
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- CN115978738A CN115978738A CN202211603351.2A CN202211603351A CN115978738A CN 115978738 A CN115978738 A CN 115978738A CN 202211603351 A CN202211603351 A CN 202211603351A CN 115978738 A CN115978738 A CN 115978738A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 98
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- 230000009467 reduction Effects 0.000 claims description 24
- 238000012937 correction Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 233
- 239000003507 refrigerant Substances 0.000 description 13
- 238000013461 design Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
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Abstract
The invention discloses an oil return control method and an air conditioning system, wherein the oil return control method comprises the following steps: detecting the operation parameters of the air conditioning system, and when the operation parameters reach the set oil return condition, according to the external environment temperature t Environment(s) Selecting a corresponding oil return mode according to the level of the oil; when it is outPartial ambient temperature t Environment(s) >When the temperature is set, the air conditioning system enters a first oil return mode to increase the running frequency of the compressor to a set oil return frequency H Frequency of oil return Detecting whether the compressor has a shutdown risk, and if so, increasing the rotating speed of the condensing fan to a set ultrahigh rotating speed n Ultra-high speed And shielding the shutdown protection action corresponding to the oil return protection condition and reducing the running frequency of the compressor when the oil return protection condition is triggered each time. According to the invention, the stable oil return of the compressor in a high-temperature environment is ensured by improving the rotating speed of the condensing fan, reducing the running frequency of the compressor and the like, and the reliability of the air conditioning system is improved.
Description
Technical Field
The invention relates to the technical field of air conditioning systems, in particular to an oil return control method applicable to oil return in a high-temperature environment and an air conditioning system.
Background
With the increasing global average temperature and the drastic rise of local areas, the environmental temperature of inland and desert areas such as the middle east often exceeds 60 ℃, and the important topic is to research how an air conditioner is adapted to reliably operate under the increased environmental temperature. As is well known, there are two types of relatively environmentally friendly refrigerants commonly used today: 1. the critical temperature of R410A is 72.5 ℃, the critical pressure is 4.95MPa, R410A is widely applied, the pressure bearing of heat exchangers, pipelines and the like can be met, but the critical temperature limits the high-temperature adaptability;
2. the critical temperature of R32 is 78.3 ℃, the critical pressure is 5.78MPa, the critical temperature of R32 is slightly higher, the high-temperature adaptability is better, but the pressure is higher, and the risk exists in the pressure bearing of heat exchangers, pipelines and the like.
Therefore, the high pressure limit values of different refrigerants are basically the same, namely, the temperature difference between the condensing temperature of the condensing side of the air conditioner and air is smaller along with the rise of the ambient temperature, which means that the condensing side of the air conditioner needs to be made larger or the rotating speed of a condensing fan is greatly increased to meet the requirement of high-temperature heat exchange. Meanwhile, when the ambient temperature is too high, in order to ensure that the bearing pressure of the compressor is not exceeded and the high pressure, high temperature, overcurrent and other series problems caused by the too high ambient temperature are avoided, the frequency of the compressor can only be reduced, but the discharge capacity is reduced after the frequency of the compressor is too low, the flow rate of refrigerant in the air conditioning system is reduced, so that lubricating oil which flows out from the compressor along with a refrigerant pump cannot be brought back to the compressor through the refrigerant, oil shortage can occur under the long-term operation, the rotor of the compressor running at a high speed is lubricated without oil or oil shortage, the rotor generates heat, and the rotor is worn until being damaged quickly.
Therefore, how to design an oil return control method for reliable oil return in a high-temperature environment is a technical problem to be solved urgently in the industry.
Disclosure of Invention
In order to overcome the defect that the existing air conditioning system is lack of oil when running for a long time in an ultra-high temperature environment, the invention provides an oil return control method and the air conditioning system.
The technical scheme adopted by the invention is that the designed oil return control method comprises the following steps:
detecting the operation parameters of the air conditioning system, and when the operation parameters reach the set oil return condition, according to the external environment temperature t Environment(s) Selecting a corresponding oil return mode according to the level of the oil;
after entering the oil return mode, the operation frequency of the compressor is increased to the set oil return frequency H Frequency of oil return Detecting whether the compressor has a shutdown risk or not, and if so, increasing the rotating speed of the condensing fan to a set ultrahigh rotating speed n Ultra-high speed 。
Further, the oil return mode includes: a first oil return mode and/or a second oil return mode;
when the external ambient temperature t Environment(s) of >When the temperature is set, the air conditioning system enters a first oil return mode, and when an oil return protection condition is triggered each time, a shutdown protection action corresponding to the oil return protection condition is shielded, and the running frequency of the compressor is reduced;
when the external ambient temperature t Environment(s) And when the temperature is lower than or equal to the set temperature, the air conditioning system enters a second oil return mode, if the oil return protection condition is triggered, the shutdown protection action corresponding to the oil return protection condition is shielded, and the air conditioning system exits from the second oil return mode.
Further, the oil return protection conditions include: at least one of a high-temperature exhaust protection condition, a compressor operation over-current protection condition, and a high-pressure exhaust protection condition. The high-temperature protection condition of exhaust is that the exhaust temperature of the compressor is more than or equal to a set high-temperature protection value T Exhaust high temperature protection . The compressor operation overcurrent protection condition is that the operation current of the compressor is more than or equal to a set overcurrent protection value I Overcurrent protection . High exhaust gasThe pressure protection condition is that the exhaust pressure of the compressor is more than or equal to a set high-pressure protection value P Exhaust high pressure protection 。
In some embodiments, the air conditioning system has a high voltage switch mounted on the discharge side of the compressor, the high voltage switch emitting a high voltage protection signal when a discharge high voltage protection condition is triggered; the oil return control method further comprises the following steps: detecting the exhaust temperature and/or the running current and/or the high-voltage protection signal of the compressor in the first oil return mode;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed ；
When the discharge temperature of the compressor<T Exhaust high temperature protection And the running current of the compressor<I Overcurrent protection When the high-voltage protection signal does not appear, the compressor maintains the current running frequency;
when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or when a high-voltage protection signal appears, the running frequency of the compressor is reduced;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection 。
Further, the oil return control method further comprises:
when the air conditioning system enters a first oil return mode, starting timing the first oil return operation time;
the number of times N of reduction of the operating frequency of the compressor in the first oil return mode Number of times of oil return frequency reduction of compressor Calculating the target oil return time, N Number of times of oil return frequency reduction of compressor The more, the longer the target oil return time;
judging whether the first oil return running time reaches the target oil return time or not;
if so, the air conditioning system exits the first oil return mode;
if not, the air conditioning system continues to operate the first oil return mode.
In some embodiments, the target oil return time is T Oil return run time ×(1+k×N Number of times of oil return frequency reduction of compressor )，T Oil return run time K is a correction coefficient for setting oil return time.
In some embodiments, the operating frequency of the compressor is reduced each time by an amount f Front part ×A％，f Front side A is a scaling factor for the current operating frequency.
In some embodiments, the air conditioning system has a high voltage switch mounted on the discharge side of the compressor, the high voltage switch emitting a high voltage protection signal when a high voltage protection condition is triggered; the oil return control method further comprises the following steps: detecting the exhaust temperature and/or the running current and/or the high-pressure protection signal of the compressor in the second oil return mode;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed ；
And/or when the discharge temperature of the compressor<T Exhaust high temperature protection And the running current of the compressor<I Overcurrent protection When the high-voltage protection signal does not appear, the compressor maintains the current running frequency;
and/or when the discharge temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or when a high-pressure protection signal appears, the air-conditioning system exits the second oil return mode;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection 。
Further, the oil return control method further comprises:
when the air conditioning system enters a second oil return mode, timing second oil return operation time;
judging whether the second oil return running time reaches the set oil return time or not;
if so, the air conditioning system exits the second oil return mode;
and if not, the air conditioning system continues to operate the second oil return mode.
Further, the oil return control method further comprises:
recording the operating frequency of the compressor as f when the air conditioning system enters the oil return mode General rule ；
Restoring the operating frequency of the compressor to f after the air conditioning system exits the oil return mode General of 。
Furthermore, the operation parameter is the operation time of the compressor in the non-oil return mode, and the oil return condition is set to be that the operation time of the compressor is not less than or equal to the set oil return interval time t Interval time of oil return 。
The invention also provides an air conditioning system, and a controller of the air conditioning system executes the oil return control method.
In some embodiments, the air conditioning system is a variable frequency air conditioning system.
Compared with the prior art, the invention has the following beneficial effects:
1. after entering an oil return mode, if the compressor has a shutdown risk, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed The problem that the exhaust temperature, the running current of the compressor and the like exceed the allowable range caused by the lifting frequency of the compressor when the air conditioning system runs in oil return is solved, the high-temperature adaptability of the condensation side of the air conditioning system is improved to the maximum extent, and the stable oil return of the compressor is guaranteed;
2. the method comprises the steps that a first oil return mode is selected in an ultra-high temperature environment, when an oil return protection condition is triggered each time, a shutdown protection action corresponding to the oil return protection condition is shielded, the operation frequency of a compressor is reduced, the compressor is guaranteed to continuously return oil until a target oil return time is reached, and the quantity of oil enough to meet the requirement of normal operation of the compressor for lubrication is ensured in the compressor;
3. and if the oil return protection condition is triggered, the shutdown protection action corresponding to the oil return protection condition is shielded, and the second oil return mode is exited, so that the air conditioning system can quickly recover to normal operation, and the use experience of a user is improved.
Drawings
The invention is described in detail below with reference to examples and figures, in which:
FIG. 1 is a schematic diagram of the connection of the air conditioning system of the present invention;
FIG. 2 is a schematic flow diagram of a method for controlling oil return according to the present invention;
reference numerals: 1. a compressor; 2. a variable frequency drive; 3. a controller; 4. a throttling device; 5. a filter; 6. an outdoor environment temperature sensing bulb; 7. an outdoor fan; 8. an outdoor heat exchanger; 9. an exhaust temperature sensing bulb; 10. a high voltage switch; 11. a low voltage switch; 12. an indoor heat exchanger; 13. an auxiliary electric heater; 14. an indoor fan; 15. an inner tube thermal bulb; 16. and (4) returning air to the thermal bulb.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the oil return control method provided by the present invention is applicable to an air conditioning system, including but not limited to an inverter air conditioning system, and the air conditioning system includes: the air conditioner comprises a compressor 1, an outdoor heat exchanger 8, a throttling device 4 and an indoor heat exchanger 12, wherein the outdoor heat exchanger 8 is provided with a speed-adjustable outdoor fan 7, and the indoor heat exchanger 12 is provided with an indoor fan 14. Taking the cooling mode as an example, the refrigerant flow direction of the air conditioning system is the air outlet of the compressor 1 → the outdoor heat exchanger 8 → the throttling device 4 → the indoor heat exchanger 12 → the air inlet of the compressor 1, and the main function of the outdoor fan 7 is to generate air flow by rotation, take away the heat generated by the outdoor heat exchanger 8 through the air, reduce the refrigerant temperature in the outdoor heat exchanger 8, and ensure that the high pressure, the exhaust temperature, the compressor operating current and the like of the air conditioning system are maintained within a certain range. The throttling device 4 mainly functions to reduce the pressure and the temperature of the high-temperature and high-pressure refrigerant flowing out of the outdoor heat exchanger 8, and the refrigerant flowing out of the throttling device 4 can absorb the heat in the air in the indoor heat exchanger 12 to achieve a refrigeration effect.
The invention relates to an oil return mode of an air conditioning system, which is designed aiming at the oil return mode of the air conditioning system to ensure that the compressor has enough oil quantity to meet the lubrication requirement of the normal operation of the compressor, wherein in the oil return mode, the flow direction of a refrigerant of the air conditioning system is the same as that in a refrigeration mode, an outdoor heat exchanger 8 is used as a condenser, an outdoor fan 7 is used as a condensing fan, an indoor heat exchanger 12 is used as an evaporator, and an indoor fan 14 is used as an evaporation fan.
Specifically, the design logic of the oil return control method is that the operation parameters of the air conditioning system are detected, and when the operation parameters reach the set oil return condition, the external environment temperature t is used for controlling the oil return according to the design logic Environment(s) The corresponding oil return mode is selected according to the height of the compressor, and after the compressor enters the oil return mode, the running frequency of the compressor is increased to the set oil return frequency H Frequency of oil return Detecting whether the compressor has a shutdown risk or not, if so, indicating that the exhaust temperature, the running current and the like exceed the allowable range due to the lifting frequency of the compressor in the oil return running process, and continuing running in the current state possibly to cause shutdown protection action, so that the rotating speed of the condensing fan is lifted to the set ultrahigh rotating speed n Ultra-high speed The high-temperature adaptability of the condensation side of the air conditioning system is improved to the maximum extent, the heat dissipation of the refrigerant of the outdoor heat exchanger is accelerated, the shutdown risk is attempted to be relieved, and the stable oil return of the compressor is guaranteed.
In an ultra-high temperature environment, the compressor basically runs at a low frequency, a situation of severe oil shortage can occur after the compressor runs for a long time, after the compressor enters the oil return mode, the rotating speed of the condensing fan is only increased and the shutdown risk is possibly not enough to be relieved, and the compressor needs to be ensured to continuously return oil to reach the target oil return time by means of other modes, so in some embodiments of the invention, the oil return mode comprises: a first oil return mode when the external environment temperature t Environment(s) of >When the temperature is set, the air conditioning system enters a first oil return mode, and when an oil return protection condition is triggered each time, the shutdown protection action corresponding to the oil return protection condition is shielded, and the running frequency of the compressor is reduced. The amplitude of each reduction can be designed according to specific requirements, for example the amplitude of each reduction of the operating frequency of the compressorDegree is designed as f Front part ×A％，f Front side A is a scaling factor for the current operating frequency. The first oil return mode reduces parameters such as exhaust temperature, operation current and the like by reducing the operation frequency of the compressor, so that the compressor is under a corresponding oil return protection condition, and stable and continuous oil return of the compressor is ensured.
Generally, the oil return protection conditions include: at least one of a high-temperature exhaust protection condition, a compressor operating over-current protection condition, and a high-pressure exhaust protection condition. The high-temperature protection condition of exhaust is that the exhaust temperature of the compressor is more than or equal to a set high-temperature protection value T Exhaust high temperature protection . The compressor operation overcurrent protection condition is that the operation current of the compressor is more than or equal to a set overcurrent protection value I Overcurrent protection . The exhaust high-pressure protection condition is that the exhaust pressure of the compressor is more than or equal to a set high-pressure protection value P Exhaust high pressure protection 。
In a preferred embodiment, the air conditioning system is provided with a high-voltage switch arranged on the exhaust side of the compressor, when the exhaust high-voltage protection condition is triggered, the high-voltage switch sends out a high-voltage protection signal, and the controller of the air conditioning system judges whether the exhaust high-voltage protection condition is triggered or not by detecting whether the high-voltage protection signal exists or not, namely whether the exhaust side pressure of the compressor exceeds P or not is indirectly reflected by the high-voltage switch Exhaust high pressure protection If the high-voltage protection signal appears, the exhaust high-voltage protection condition is triggered, and if the high-voltage protection signal does not appear, the exhaust high-voltage protection condition is not triggered.
The oil return control method comprises the following steps: after entering the first oil return mode, every t Detecting frequency Detecting the exhaust temperature and/or the running current and/or the high-voltage protection signal of the compressor;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed Until the first oil return mode is exited;
when the discharge temperature of the compressor<T Exhaust high temperature protection And the running current of the compressor<I Overcurrent protection And does not appear highWhen the protection signal is pressed, the running state of the compressor is still available, and the current running frequency is maintained;
when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or when a high-voltage protection signal appears, the running state of the compressor is poor, and the running frequency of the compressor is reduced;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection 。
It should be understood that the shutdown protection conditions may be selected according to actual conditions, and the detection parameters may be adaptively adjusted. For example, if the shutdown protection condition selects the exhaust high-temperature protection condition and the compressor operation overcurrent protection condition, the exhaust temperature and the operation current of the compressor are detected after the first oil return mode is entered, and when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed (ii) a When the discharge temperature of the compressor<T Exhaust high temperature protection And the running current of the compressor<I Overcurrent protection When the current running frequency is not reached, the compressor maintains the current running frequency; when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection In time, the operating frequency of the compressor is reduced. For another example, the shutdown protection condition only selects the exhaust high-temperature protection condition, and the exhaust temperature of the compressor is detected after the first oil return mode is entered, and when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed (ii) a When the discharge temperature of the compressor<T Exhaust high temperature protection When the current running frequency is maintained, the compressor maintains the current running frequency; when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection In time, the operating frequency of the compressor is reduced. In some embodiments, the high-voltage switch does not play a practical role in oil return operation, and can be installed or uninstalled according to specific use requirements, but the invention does not do soWith special restrictions.
In a possible embodiment of the present invention, an air conditioning system has a pressure sensor installed at a discharge side of a compressor, and the possible embodiment is different from the preferred embodiment in that a discharge pressure of the compressor is directly detected by the pressure sensor.
The oil return control method comprises the following steps: after entering the first oil return mode, every t Detecting frequency Detecting the discharge temperature and/or the operation current and/or the discharge pressure of the compressor;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit Or the exhaust pressure of the compressor is more than or equal to P High pressure limit of exhaust When the rotating speed of the condensing fan is increased to the set ultrahigh rotating speed n Ultra-high speed ；
When the discharge temperature of the compressor<T Exhaust high temperature protection Or the operating current of the compressor<I Overcurrent protection Or discharge pressure of the compressor<P Exhaust high pressure protection When the current running frequency is maintained, the compressor maintains the current running frequency;
when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or the discharge pressure of the compressor is more than or equal to P Exhaust high pressure protection When the frequency of operation of the compressor is reduced;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection ，T Exhaust high pressure limit <T Exhaust high pressure protection 。
It should be noted that, because the failure rate of the pressure sensor on the exhaust side of the compressor is high, which is a common fault in the air conditioning industry, the problems of poor accuracy and high maintenance rate exist although the pressure sensor is used to collect the exhaust pressure. It can be seen that designing the high-temperature oil return control logic based on the high-voltage switch is the preferred scheme.
In order to ensure that the oil return control under the ultra-high temperature environment is more accurate, the oil return control method further comprises the following steps:
when the air conditioning system enters a first oil return mode, starting to time the first oil return running time;
the number N of times of reduction of the operating frequency of the compressor in the first oil return mode Number of times of oil return frequency reduction of compressor Calculating a target oil return time, each time the compressor operating frequency is reduced, N Number of times of oil return frequency reduction of compressor All will add one automatically, because the oil return is to increase the refrigerant flow by increasing the operating frequency of the compressor, thereby increasing the refrigerant flow rate, and realizing bringing the lubricating oil back to the compressor, therefore N Number of times of oil return frequency reduction of compressor The more, the lower the running frequency of the compressor after frequency reduction, and the longer the time for bringing the lubricating oil back to the compressor from the air conditioning system is, that is, the longer the target oil return time is;
judging whether the first oil return running time reaches the target oil return time or not;
if so, indicating that oil return is finished, and exiting the first oil return mode by the air conditioning system;
if not, the oil return is not finished, and the air conditioning system continues to operate the first oil return mode.
It should be noted that, the inventor verifies through a large amount of experimental data to obtain a calculation model of a target oil return time, where the target oil return time is T Oil return run time ×(1+k×N Number of times of oil return frequency reduction of compressor )，T Oil return run time And k is a correction coefficient for setting the oil return time, and if the running frequency of the compressor is not reduced in the whole process of the first oil return mode, the target oil return time is the set oil return time. In fact, the 'reduction times' are related to the reduction amplitude A% of the oil return frequency, the larger A is, the reduction times are less, the smaller A is, the reduction times are more, the design has the advantages that the oil return capacity is reduced after the running frequency of the compressor is reduced by A%, and the expected oil return amount cannot be achieved due to the fact that the reduction of the frequency reduction oil return capacity is compensated by prolonging the oil return time. Of course, in practical applications, other calculation manners may be designed according to different factors such as the type of the air conditioning system and the use environment, and the present invention is not limited to this.
Because under the conventional environment, the compressor can be basically ensured to operate at a larger frequency, and the phenomenon of tightness does not occurIn the event of heavy oil starvation, therefore, in some embodiments of the present invention, the oil return mode further comprises: a second oil return mode when the external ambient temperature t is Environment(s) And when the temperature is less than or equal to the set temperature, the air conditioning system enters a second oil return mode, and if an oil return protection condition is triggered, the shutdown protection action corresponding to the oil return protection condition is shielded, and the air conditioning system exits from the second oil return mode. When the air conditioner works under the normal environment, the air conditioner immediately exits the oil return mode after the oil return protection condition is triggered, so that the air conditioner quickly recovers the normal operation, and the use experience of a user is improved.
In the above preferred embodiment, the oil return control method further includes: in the second oil return mode, every t Detecting frequency Detecting the exhaust temperature and/or the operation current and/or the high-voltage protection signal of the compressor;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed ；
When the discharge temperature of the compressor<T Exhaust high temperature protection And the running current of the compressor<I Overcurrent protection When the high-voltage protection signal does not appear, the compressor maintains the current running frequency;
when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or when a high-pressure protection signal appears, the air-conditioning system exits the second oil return mode;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection 。
It should be understood that, for the conventional environment, the shutdown protection condition may also be selected according to actual conditions, and the selection logic is similar to that of the ultra-high temperature environment, which is not described herein again.
Based on the above possible embodiment, the oil return control method includes: after entering the second oil return mode, every t Detecting frequency Detecting the exhaust temperature and/or the operation current and/or the exhaust pressure of the compressor;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit Or the exhaust pressure of the compressor is more than or equal to P Exhaust high pressure limit When the rotating speed of the condensing fan is increased to the set ultrahigh rotating speed n Ultra-high speed ；
When the discharge temperature of the compressor<T Exhaust high temperature protection Or the operating current of the compressor<I Overcurrent protection Or discharge pressure of the compressor<P Exhaust high pressure protection When the current running frequency is not reached, the compressor maintains the current running frequency;
when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or the exhaust pressure of the compressor is more than or equal to P Exhaust high pressure protection When the air conditioning system exits the second oil return mode;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection ，T High pressure limit of exhaust <T Exhaust high pressure protection 。
It should be noted that, because the failure rate of the pressure sensor on the exhaust side of the compressor is high, it is also preferable to design the normal temperature oil return control logic on the basis of the high-pressure switch.
In order to ensure that the oil return control under the conventional environment is more accurate, the oil return control method further comprises the following steps:
when the air conditioning system enters a second oil return mode, timing second oil return operation time;
judging whether the second oil return running time reaches the set oil return time or not;
if yes, the oil return is finished, and the air conditioning system exits the second oil return mode;
if not, the oil return is not finished, and the air-conditioning system continues to operate the second oil return mode.
It should be understood that the oil return mode may only include the first oil return mode or the second oil return mode, or may include both the first oil return mode and the second oil return mode, and the selection is made according to the actual usage scenario of the air conditioning system. For example, if the ambient temperature t outside the usage scenario of the air conditioning system Environment(s) The oil return mode can only comprise a second oil return mode and cancel the first oil return mode in the oil return control method if the set temperature is not exceeded all the time, and if the external environment temperature t of the use scene of the air-conditioning system is not exceeded, the external environment temperature t of the use scene of the air-conditioning system Environment(s) The oil return modes may include a first oil return mode and a second oil return mode, and the corresponding oil return mode is selected according to the height of the external environment temperature.
In addition, the set temperature is preferably 52 ℃,52 ℃ is the limit value of the national standard T3 working condition, and the compressor can be basically ensured to operate under a larger frequency below the set temperature, namely the external environment temperature T Environment(s) The condition that the temperature exceeds 52 ℃ is an ultrahigh temperature environment, after the air conditioning system runs for a long time, the compressor is seriously lack of oil, a first oil return mode needs to be operated for oil return, the oil quantity of the compressor and the external environment temperature t are guaranteed Environment(s) The temperature of the air conditioner system is not higher than 52 ℃, namely the air conditioner system is in a conventional environment, after the air conditioner system runs for a long time, the compressor is not seriously lack of oil, a second oil return mode needs to be run for oil return, and the user experience is guaranteed while the oil return is proper.
In some embodiments of the present invention, the operation parameter is the operation time of the compressor in the non-oil-return mode, and the oil-return condition is set such that the operation time of the compressor is greater than or equal to the set oil-return interval time t Interval time of oil return That is, after the compressor runs for a long time, the air conditioning system performs oil return, and when the air conditioning system enters the oil return mode, the running frequency of the compressor is recorded as f General of (ii) a Restoring the operating frequency of the compressor to f after the air conditioning system exits the oil return mode General of 。
It is noted that "n" in the above Ultra-high speed ”、“T Exhaust high temperature protection ”、“T High temperature limit of exhaust ”、“t Interval time of oil return ”、“A％”、“t Detecting frequency "," k ", etc. are all statistically derived from experimental data, e.g., t Detecting frequency The value is 1-30 seconds, and the value of k is 1-30.
As shown in fig. 2, taking the oil return modes including the first oil return mode and the second oil return mode as an example, the flow of the oil return control method is as follows:
detecting operating parameters of an air conditioning system;
judging whether the operation parameters reach the set oil return conditions or not;
if yes, according to the external environment temperature t Environment(s) Selecting a corresponding oil return mode according to the level of the oil;
when the external ambient temperature t Environment(s) >When the temperature is set, the air conditioning system enters a first oil return mode, the first oil return operation time is started to be timed, and the operation frequency of the compressor is increased to the set oil return frequency H Frequency of oil return Every t Detecting frequency Detecting the exhaust temperature and the running current of the compressor and a high-voltage protection signal, and if the compressor has a shutdown risk, increasing the rotating speed of the condensing fan to a set ultrahigh rotating speed n Ultra-high speed If the oil return protection condition is triggered, the shutdown protection action corresponding to the oil return protection condition is shielded, the running frequency of the compressor is reduced, and the number N of times of reduction of the running frequency of the compressor is determined Number of times of oil return frequency reduction of compressor Calculating target oil return time, and if the first oil return operation time reaches the target oil return time, the air-conditioning system exits the first oil return mode;
when the external ambient temperature t Environment(s) When the temperature is less than or equal to the set temperature, the air conditioning system enters a second oil return mode, the second oil return operation time is timed, and the operation frequency of the compressor is increased to the set oil return frequency H Frequency of oil return Every t, every Detecting frequency Detecting the exhaust temperature, the running current and the high-voltage protection signal of the compressor, and if the compressor has the shutdown risk, increasing the rotating speed of the condensing fan to a set ultrahigh rotating speed n Ultra-high speed And if the oil return protection condition is triggered, shielding the shutdown protection action corresponding to the oil return protection condition, and exiting the second oil return mode, and if the second oil return operation time reaches the set oil return time, exiting the second oil return mode by the air conditioning system.
As shown in fig. 1, the present invention also provides an air conditioning system, the controller 3 of which executes the oil return control method, and in a preferred embodiment, the air conditioning system is equipped with detection devices such as a high-voltage switch 10, an exhaust bulb 9 and an outdoor environment bulb 6The high-temperature switch 10 is used as a detection device for protecting the overpressure operation of the air conditioning system and provides a high-voltage protection signal for the controller 3 to output an execution command. The exhaust temperature sensing bulb 9 is used for feeding back the exhaust temperature of the compressor 1 in the air conditioning system to the controller 3 and providing temperature parameters for the controller 3 to output execution instructions. The function of the outdoor environment temperature sensing bulb 6 is to sense the external environment temperature t Environment(s) of Is fed back to the controller 3 to provide temperature parameters for the controller 3 to output instructions. The controller 3 is used for calculating the temperature parameters transmitted by the exhaust temperature sensing bulb 9, the return air temperature sensing bulb 16, the inner pipe temperature sensing bulb 15 and the outdoor environment temperature sensing bulb 6 and the compressor operation frequency and current parameters provided by the variable frequency driver 2 according to the high-voltage protection signal provided by the high-voltage switch 10, and then issuing an execution instruction to the compressor 1, the outdoor fan 7, the indoor fan 14 and the throttling device 4.
The controller 3 judges that the set oil return time t is met according to the running time of the compressor Interval time of oil return During the operation, an oil return operation instruction is given to the variable frequency drive 2, the variable frequency drive 2 increases the operation frequency of the compressor 1 to perform oil return operation, and the specific oil return control logic is detailed in the oil return control method, which is not described herein again.
It is noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. The terms "first", "second", etc. are used to define the oil return mode, only for the convenience of distinguishing the corresponding oil return mode, and if not stated otherwise, the above terms do not have special meanings, and therefore, the scope of protection of the present invention is not to be construed as being limited.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (13)
1. The oil return control method is characterized by comprising the following steps:
detecting the operating parameters of the air conditioning system, and when the operating parameters reach the set oil return condition, according to the external environment temperature t Environment(s) Selecting a corresponding oil return mode according to the level of the oil;
after entering the oil return mode, the operation frequency of the compressor is increased to a set oil return frequency H Frequency of oil return Detecting whether the compressor has a shutdown risk or not, and if so, increasing the rotating speed of the condensing fan to a set ultrahigh rotating speed n Ultra-high speed 。
2. The oil return control method according to claim 1, wherein the oil return mode includes: a first oil return mode and/or a second oil return mode;
when the external ambient temperature t Environment(s) of >When the temperature is set, the air conditioning system enters the first oil return mode, and when the oil return protection condition is triggered each time, the shutdown protection action corresponding to the oil return protection condition is shielded, and the pressure is appliedThe running frequency of the compressor is reduced;
when the external ambient temperature t Environment(s) And when the temperature is less than or equal to the set temperature, the air conditioning system enters the second oil return mode, and if an oil return protection condition is triggered, the shutdown protection action corresponding to the oil return protection condition is shielded, and the air conditioning system exits from the second oil return mode.
3. The oil return control method according to claim 2, wherein the oil return protection condition includes: at least one of a high-temperature exhaust protection condition, a compressor operation over-current protection condition, and a high-pressure exhaust protection condition;
the exhaust high-temperature protection condition is that the exhaust temperature of the compressor is more than or equal to a set high-temperature protection value T Exhaust high temperature protection ；
The compressor operation overcurrent protection condition is that the operation current of the compressor is more than or equal to a set overcurrent protection value I Overcurrent protection ；
The exhaust high-pressure protection condition is that the exhaust pressure of the compressor is more than or equal to a set high-pressure protection value P Exhaust high pressure protection 。
4. The oil return control method according to claim 3, wherein the air conditioning system has a high-voltage switch installed at a discharge side of the compressor, the high-voltage switch emitting a high-voltage protection signal when the discharge high-voltage protection condition is triggered;
the oil return control method further comprises the following steps:
detecting the discharge temperature and/or the running current of the compressor and/or the high-voltage protection signal in the first oil return mode;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed ；
When the discharge temperature of the compressor<T Exhaust high temperature protection And the running current of the compressor<I Overcurrent protection When the high-voltage protection signal does not appear, the compressor maintains the current running frequency;
when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or when the high-voltage protection signal appears, the running frequency of the compressor is reduced;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection 。
5. The oil return control method according to claim 4, further comprising:
when the air conditioning system enters the first oil return mode, starting to time the first oil return running time;
the number N of times of reduction of the running frequency of the compressor under the first oil return mode Number of times of oil return frequency reduction of compressor Calculating the target oil return time, N Number of times of oil return frequency reduction of compressor The more, the longer the target oil return time;
judging whether the first oil return running time reaches a target oil return time or not;
if so, the air conditioning system exits the first oil return mode;
if not, the air conditioning system continues to operate the first oil return mode.
6. The oil return control method of claim 5, wherein the target oil return time is T Oil return run time ×(1+k×N Number of times of oil return frequency reduction of compressor )，T Oil return run time K is a correction coefficient for setting the oil return time.
7. Oil return control method according to claim 4, characterized in that the operating frequency of the compressor is reduced each time by an amplitude f Front side ×A％，f Front part A is a scaling factor for the current operating frequency.
8. The oil return control method according to claim 3, wherein the air conditioning system has a high-pressure switch installed at a discharge side of the compressor, the high-pressure switch emitting a high-pressure protection signal when the high-pressure protection condition is triggered;
the oil return control method further comprises the following steps:
detecting a discharge temperature and/or an operating current and/or the high-pressure protection signal of the compressor in the second oil return mode;
when the exhaust temperature of the compressor is more than or equal to T High temperature limit of exhaust Or the running current of the compressor is more than or equal to I Over-current limit When the compressor is stopped, the rotating speed of the condensing fan is increased to a set ultrahigh rotating speed n Ultra-high speed ；
And/or when the discharge temperature of the compressor<T Exhaust high temperature protection And the running current of the compressor<I Overcurrent protection When the high-voltage protection signal does not appear, the compressor maintains the current running frequency;
and/or when the exhaust temperature of the compressor is more than or equal to T Exhaust high temperature protection Or the running current of the compressor is more than or equal to I Overcurrent protection Or when the high-pressure protection signal appears, the air conditioning system exits the second oil return mode;
wherein, T High temperature limit of exhaust <T Exhaust high temperature protection ，I Over-current limit <I Overcurrent protection 。
9. The oil return control method according to claim 8, further comprising:
when the air conditioning system enters a second oil return mode, timing second oil return operation time;
judging whether the second oil return running time reaches set oil return time or not;
if so, the air conditioning system exits the second oil return mode;
and if not, the air conditioning system continues to operate the second oil return mode.
10. The oil return control method according to claim 1, further comprising:
recording an operating frequency of the compressor as f when the air conditioning system enters the oil return mode General of ；
Restoring the operating frequency of the compressor to f after the air conditioning system exits the oil return mode General of 。
11. The oil return control method according to any one of claims 1 to 10, wherein the operation parameter is a compressor operation time in a non-oil return mode, and the set oil return condition is that the compressor operation time is greater than or equal to a set oil return interval time t Interval time of oil return 。
12. An air conditioning system, characterized in that a controller of the air conditioning system executes the oil return control method according to any one of claims 1 to 11.
13. The air conditioning system of claim 12, wherein the air conditioning system is a variable frequency air conditioning system.
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