CN108050648B - Air conditioner oil blockage fault detection method and air conditioner - Google Patents
Air conditioner oil blockage fault detection method and air conditioner Download PDFInfo
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- CN108050648B CN108050648B CN201711235713.6A CN201711235713A CN108050648B CN 108050648 B CN108050648 B CN 108050648B CN 201711235713 A CN201711235713 A CN 201711235713A CN 108050648 B CN108050648 B CN 108050648B
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Abstract
The invention discloses an air conditioner and a detection method of oil blockage faults of the air conditioner.A refrigerant used by the air conditioner is a flammable refrigerant, and the air conditioner comprises a pressure stop valve which is connected in series with a throttling device and is arranged at one side of the throttling device, which is close to an outdoor heat exchanger; sequentially judging whether the current pressure value of the refrigerant at the pressure stop valve is smaller than a preset first threshold value according to preset time intervals in a non-defrosting working mode of a heating working mode; and confirming that the oil blockage is fault when the duration of the pressure cut-off valve in the closed state is larger than a preset first duration threshold value. In the technical scheme of the invention, whether the pressure stop valve is opened or not is selected by judging the pressure value of the refrigerant at the pressure stop valve after defrosting, the extraction speed of the refrigerant by the compressor is controlled, and the problem of oil blockage of a throttling component caused by overlarge pressure difference before and after throttling of the refrigerant and too low temperature after throttling is avoided.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an oil blockage fault detection method of an air conditioner and the air conditioner.
Background
At present, in the technical field of air conditioning and refrigeration, most of R410a refrigerant is used for replacing R22 refrigerant, and the advantages of the R410a refrigerant are obviously reflected in the variable-frequency air conditioner, but the R410a refrigerant has higher GWP (Global Warming Potential ) and is gradually eliminated under the background that the global greenhouse effect is increasingly serious and global climate change is increasingly important in all countries of the world. Accordingly, research is being conducted on low GWP refrigerants represented by R32 refrigerant and R290 refrigerant, particularly on refrigerant such as R290 refrigerant, which hardly causes any pollution, and development of a corresponding compressor, particularly development of a novel compressor lubricating oil, is being conducted, and attention is being paid.
The lubrication oil in the air conditioner compressor is extremely important for the normal operation of the system, and the lubrication oil plays roles in lubricating, sealing and cooling the cylinder and the rotor. When the compressor normally operates, lubricating oil is sucked into the cylinder from the bottom of the compressor through the crankshaft, compressed refrigerant with high temperature and high pressure enters the system, and then returns to the bottom of the compressor again along with the circulation of the refrigerant, and heat generated by the compressor motor and the cylinder is taken away by the refrigerant and the lubricating oil. If the oil return and air return are not smooth due to some reasons, the problems of insufficient lubricating oil of the compressor, idling and heating of the motor and the like are caused, further the abrasion between the cylinder and the rotor of the compressor is increased, the internal temperature is too high, and finally the motor is burnt out and the system is crashed. Therefore, in the system design, it is necessary to ensure that the lubricating oil can normally return to the compressor to timely discharge the heat of the motor.
However, for the flammable refrigerant (R290 refrigerant), the viscosity thereof increases sharply at low temperature, particularly in the cold-warm inverter, when the four-way valve is reversed after defrosting is completed, the ultralow temperature refrigerant and the lubricating oil in the evaporator (indoor heat exchanger) need to enter the condenser (outdoor heat exchanger) through the throttling device (such as the expansion valve), and meanwhile the flammable refrigerant is less charged due to safety, so the pressure of the air conditioning system is much smaller than the pressure of the air conditioning system of R410a refrigerant and R32 refrigerant, thereby causing the oil with relatively large viscosity to clog the throttling device, causing the flammable refrigerant to not participate in the cycle, and further causing the compressor to idle, capacity and running power to be reduced. The system lacks oil and fluorine, and the motor of the compressor excessively heats after long-time operation, thereby greatly reducing the service life of the compressor and the system, affecting the use feeling of users, and simultaneously greatly affecting the design of an air conditioning system using flammable refrigerant.
Therefore, it is necessary to provide a new method for detecting the oil blockage fault of the air conditioner to solve the above technical problems.
Disclosure of Invention
The invention mainly aims to provide an air conditioner, an oil blockage fault detection method thereof and the air conditioner, and aims to provide an effective oil blockage fault diagnosis mode.
In order to achieve the above purpose, the invention provides a method for detecting oil blockage faults of an air conditioner, wherein a refrigerant used by the air conditioner is a flammable refrigerant, and the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a pressure stop valve which is connected with the throttling device in series and is arranged on one side of the throttling device, which is close to the outdoor heat exchanger; the method comprises the following steps:
judging whether the working state of the air conditioner is a heating working mode or not;
when the working state of the air conditioner is a heating working mode, judging whether the air conditioner is in a non-defrosting working mode or not;
when the air conditioner is in a non-defrosting working mode, sequentially acquiring the current pressure value of the refrigerant at the pressure stop valve according to a preset time interval, and sequentially judging whether the current pressure value is smaller than a preset first threshold value;
and when the current pressure value is smaller than the first threshold value, closing the pressure stop valve, recording the duration of the closed state of the pressure stop valve, and when the duration of the closed state of the pressure stop valve is larger than a preset first duration threshold value, confirming that the oil blockage is caused.
Optionally, when the current pressure value is smaller than the preset first threshold value, closing the pressure stop valve, and recording the duration of the pressure stop valve in the closed state, and when the duration of the pressure stop valve in the closed state is greater than the preset first duration threshold value, determining that the oil blockage is a fault includes:
when the current pressure value is smaller than the preset first threshold value, closing the pressure stop valve and recording a first current time;
sequentially obtaining the current pressure value of the refrigerant at the pressure stop valve according to the time interval, and sequentially judging whether the current pressure value is smaller than a preset second value or not;
when the current pressure value is smaller than the second threshold value, continuing to close the pressure stop valve, and recording a second current time;
determining the duration time of the pressure cut-off valve in a closed state according to the first current time and the second current time, and judging whether the duration time of the pressure cut-off valve in the closed state is larger than the first duration threshold value;
and confirming that the oil blockage is fault when the duration of the pressure cut-off valve in the closed state is larger than a preset first duration threshold value.
Optionally, after the step of sequentially obtaining the current pressure value of the refrigerant at the pressure stop valve according to the time interval and sequentially judging whether the current pressure value is smaller than a preset second value, the method further includes:
and opening the pressure stop valve when the current pressure value is greater than or equal to the second threshold value.
Optionally, the time interval is 0.1-1 seconds; the second threshold value is larger than the first threshold value, and the second threshold value is 0-0.2Mpa; the first duration threshold is 1-5 minutes.
Optionally, when the duration of time that the pressure cut-off valve is in the closed state is greater than a preset first duration threshold, the step of confirming that the oil blockage is faulty further includes:
and closing the compressor of the air conditioner and sending out corresponding prompt information.
Optionally, when the working state of the air conditioner is a heating working mode, the step of judging whether the air conditioner is in a non-defrosting working mode includes:
when the working state of the air conditioner is a heating state, judging whether the reversing times of the four-way valve received by the air conditioner in a second preset time after the first preset time of starting operation is larger than the preset times or not so as to judge whether the air conditioner is in a non-defrosting working mode or not.
Optionally, the first preset time is 10-40 minutes, and the second preset time is 1-20 minutes.
Optionally, when the air conditioner is in the non-defrosting operation mode, the step of sequentially acquiring the current pressure value of the refrigerant at the pressure stop valve according to a preset time interval and sequentially judging whether the current pressure value is smaller than a preset first threshold value further includes:
and when the current pressure value is larger than the preset first threshold value, the pressure stop valve is kept in an open state.
Optionally, the step of maintaining the pressure stop valve in an open state when the current pressure value is greater than the preset first threshold value further includes:
when the current pressure value is larger than the preset first threshold value, recording the duration time of the pressure cut-off valve in the open state calculated from the current time, and judging whether the duration time of the pressure cut-off valve in the open state is larger than a preset second duration threshold value or not;
and returning to the step of judging whether the air conditioner is in a non-defrosting working mode when the duration of the pressure cut-off valve in the opening state is larger than a preset second duration threshold.
In addition, in order to achieve the above object, the present invention also provides an air conditioner, wherein the refrigerant used in the air conditioner is a flammable refrigerant, and the air conditioner includes a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger, and a pressure stop valve connected in series with the throttling device and arranged at one side of the throttling device close to the outdoor heat exchanger; the air conditioner further comprises a memory, a processor and an air conditioner fault diagnosis program which is stored in the memory and can run on the processor, wherein the air conditioner fault diagnosis program realizes the steps of the air conditioner oil blockage fault detection method according to any one of the above steps when being executed by the processor.
According to the technical scheme, the relative magnitude of the current pressure value of the refrigerant, which is arranged on the side, close to the outdoor heat exchanger, of the throttling device and is connected in series with the throttling device after defrosting, and the preset threshold value is judged, so that the phenomenon of oil blockage of the expansion valve caused by the increase of the viscosity of the flammable refrigerant after low-temperature defrosting of the air conditioner can be timely detected, the reduction of the capacity and the power of the air conditioner caused by idling of the compressor is avoided, the service life of the compressor is ensured, the use comfort of a new refrigerant air conditioner is improved, and a reference basis is provided for better matching the engine oil of the novel compressor with the new refrigerant in future.
Drawings
Fig. 1 is a schematic view illustrating a refrigerant cycle system of an air conditioner according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for detecting an oil blockage failure of an air conditioner according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart of a method for detecting an oil blockage failure of an air conditioner according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for detecting an oil blockage failure of an air conditioner according to a second embodiment of the present invention;
fig. 5 is a flowchart of a method for detecting an oil blockage failure of an air conditioner according to a third embodiment of the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Air conditioner | 110 | Compressor |
| 120 | Four-way jointValve | 130 | Outdoor heat exchanger |
| 140 | Throttling device | 150 | Indoor heat exchanger |
| 160 | Pressure stop valve |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a detection method for oil blockage faults of an air conditioner, and aims to solve the problem that the oil blockage faults of the existing air conditioner 100 are difficult to detect.
Fig. 1 is a schematic diagram illustrating a circulation principle of an air conditioner 100 according to an embodiment of the invention. The refrigerant used in the air conditioner 100 is a flammable refrigerant, and the air conditioner 100 includes a compressor 110, a four-way valve 120, an outdoor heat exchanger 130, a throttling device 140, and an indoor heat exchanger 150, which are sequentially and circularly connected. The air conditioner 100 further includes a pressure cutoff valve 160 disposed at a side of the throttling device 140 adjacent to the outdoor heat exchanger 130 in series with the throttling device 140.
The flammable refrigerant may be an R290 refrigerant or an R32 refrigerant, and is preferably an R290 refrigerant.
Referring to fig. 2, in a first embodiment of the present invention, a method for detecting an oil blockage fault of an air conditioner is provided, which includes the following steps:
step S210, determining whether the working state of the air conditioner is a heating working mode.
Step S220, when the working state of the air conditioner is a heating working mode, determining whether the air conditioner is in a non-defrosting working mode.
The embodiment of the invention is suitable for the field of air conditioner control. At present, the flammable refrigerant (R290 refrigerant) in the air conditioner 100 may have a rapid increase in viscosity at low temperature, particularly in a cold-warm inverter, when the four-way valve is reversed after defrosting is completed, the ultralow temperature refrigerant and lubricating oil in the evaporator (indoor heat exchanger 150) need to enter the condenser (outdoor heat exchanger 130) through the throttling device 140 (e.g., expansion valve), and meanwhile, the flammable refrigerant may have a small charge amount due to safety, so that the throttling device may be blocked by the oil with a relatively high viscosity, which may cause the flammable refrigerant to fail to participate in circulation, thereby idling the compressor 110, and reducing the capacity and operating power of the compressor 110. Therefore, the detection method in this embodiment is for the heating mode under the low temperature condition, and the oil blockage of the air conditioner 100 may be detected. In the non-defrosting operation mode of the heating mode, the outdoor heat exchanger 130 absorbs heat and the indoor heat exchanger 150 releases heat, and the outdoor temperature is low, so that the viscosity of the flammable refrigerant in the circulation pipe of the air conditioner 100 is easily increased sharply, thereby increasing the risk of oil blockage, and therefore, the oil blockage condition under the working condition needs to be detected for timely troubleshooting.
Step S230, when the air conditioner is in the non-defrosting operation mode, sequentially obtaining the current pressure value P of the refrigerant at the pressure stop valve according to a preset time interval S0, and sequentially judging whether the current pressure value P is smaller than a preset first threshold value P1.
In this embodiment, when the defrosting of the air conditioner 100 is finished in the non-defrosting operation mode, the current pressure value P of the refrigerant at the pressure stop valve may be sequentially collected at preset intervals, and whether the pressure of the refrigerant in the circulation system of the air conditioner 100 is normal or not may be determined by comparing the relationship between the current pressure value P and the preset first threshold value P1.
And step S240, closing the pressure stop valve when the current pressure value P is smaller than the first threshold value P1, recording the duration time T of the pressure stop valve in a closed state, and confirming that the oil blockage is fault when the duration time T of the pressure stop valve in the closed state is larger than a preset first duration threshold value T1.
Specifically, when the current pressure value is greater than or equal to the first threshold value, it indicates that the pressure of the refrigerant in the circulation system of the air conditioner 100 is normal, and the refrigerant (i.e., the refrigerant) may flow normally; when the current pressure value P is smaller than the first threshold value P1, it indicates that the pressure of the refrigerant in the circulation system of the air conditioner 100 is small, and is insufficient to promote the normal flow of the refrigerant, at this time, the pressure stop valve is closed, the duration T of the pressure stop valve in the closed state is recorded, and when the duration T of the pressure stop valve in the closed state is greater than a preset first duration threshold value T1, the oil blockage fault is confirmed.
In the method for detecting the oil blockage fault of the air conditioner provided by the embodiment, whether the stop valve is opened or not is selected by judging the relative magnitude of the current pressure value of the refrigerant which is connected with the throttling device in series and is arranged at the pressure stop valve at one side of the throttling device, which is close to the outdoor heat exchanger, and the preset threshold value, so that the speed of extracting the refrigerant by the compressor is controlled, and the problem of oil blockage of a throttling component caused by overlarge pressure difference before and after throttling of the refrigerant and too low temperature after throttling is avoided. The expansion valve oil blocking phenomenon caused by the increase of the viscosity of the flammable refrigerant after low-temperature defrosting of the air conditioner can be timely detected, the reliability of an air conditioning system is improved, the service lives of the compressor and the air conditioning system are ensured, the use comfort of the air conditioning system is optimized, and the user experience is improved.
In an optional embodiment, when the operation state of the air conditioner 100 is the heating operation mode in step S220, the step of determining whether the air conditioner 100 is in the non-defrosting operation mode may include:
when the operating state of the air conditioner 100 is the heating state, it is determined whether the number of commutations of the four-way valve 120 received in the second preset time M after the first preset time C0 of the start-up operation of the air conditioner 100 is greater than the preset number of times N, so as to determine whether the air conditioner 100 is in the non-defrosting operating mode.
Referring to fig. 3, step S220 can be specifically split into the following steps:
step S221, operating a first preset time C0 in a heating mode;
in step S222, it is determined whether the air conditioner 100 collects the reversing signal of the four-way valve 120N times within the second preset time M.
When the air conditioner 100 collects the reversing signal of the four-way valve 120 for N times within the second preset time M, it is indicated that the defrosting of the air conditioner 100 is finished and the air conditioner enters a normal heating mode, and it is required to detect whether the oil blockage exists. And when the air conditioner 100 collects the reversing signal of the four-way valve 120 for less than N times in the second preset time M, the collection of the reversing signal of the four-way valve 120 is continued until the reversing signal of the four-way valve 120 is collected for N times in the next second preset time M.
The first preset time C0 can be 10-40 min, specifically can be 10min, 15min, 20min, 30min, 40min and the like, and the second preset time M can be 10-30 min, specifically can be 10min, 15min, 20min, 30min and the like; the N times of the commutation signal may be two times, three times, four times, etc., which is not limited in the present invention.
Specifically, the value of the first predetermined time C0 cannot be too small, so as to prevent the user from being unable to determine the defrosting operation due to the misoperation when the air conditioner 100 is started.
Referring to fig. 3, in an alternative embodiment, step S230 may be specifically split into the following steps:
step S231, the air conditioner 100 sequentially obtains the current pressure value P of the refrigerant at the pressure stop valve according to a preset time interval S0;
step S232, sequentially determining whether the current pressure value P is smaller than a preset first threshold P1.
The time interval S0 may be set according to the actual operation condition of the air conditioner 100, but in the above embodiment, the time interval S0 may be 0.1-1 second, specifically, may be 0.1 second, 0.3 second, 0.5 second, 0.8 second, 1 second, or the like, which is not limited in this invention. Specifically, the value of the time interval S0 of the pressure acquisition cannot be too large, when the circulation system of the air conditioner 100 is blocked, the pressure of the downstream of the throttling component 140 can be rapidly reduced to be below 0, and the smaller the value of S0 is, the more accurate the blocking problem of the circulation system can be detected, so that the system reliability is improved.
The preset first threshold P1 may be set according to the actual operation condition of the air conditioner 100, and in the above embodiment, the preset first threshold P1 is 0.1-0.2Mpa.
Further, in an embodiment, the preset first duration threshold T1 in the step S240 may be set according to the actual operation condition of the air conditioner 100, and in the above embodiment, the preset first duration threshold T1 may be 1-5 minutes. In general, the value of the preset first duration threshold T1 cannot be too large, because the closing of the pressure cut-off valve for a long time may cause the circulation of the system refrigerant to be poor, which affects the comfort of the user.
Further, in an embodiment, after confirming that the oil blockage fault occurs, the shortage of the flammable refrigerant will cause the compressor 110 to idle, thereby affecting the service life of the compressor 110, and therefore, it is necessary to prompt the user to immediately adjust the usage status of the air conditioner 100 or turn off the air conditioner 100. In other embodiments, after confirming that the oil blockage fault occurs, the processor may also directly turn off the compressor 110 of the air conditioner 100 and send out a corresponding prompt message. Specifically, the prompt information may be alarm sound or flashing of an indicator light, or may be text information or graphic information displayed on a panel of the indoor unit, a line controller or a remote controller.
Referring to fig. 3 in combination, the following describes a specific example of the steps of the method for detecting the oil blockage fault of the air conditioner according to the present invention. Specifically, the air conditioner 100 is operated in a heating mode, where the time interval S0 is 0.5 seconds, the preset first threshold P1 is 0.5Mpa, the preset first duration threshold T1 may be 3 minutes, the first preset time C0 is 20 minutes, the second preset time M is 10 minutes, and the N times of reversing signals are two times.
The method for detecting the oil blockage fault of the air conditioner comprises the following steps:
step S221, operating for 20min in a heating mode;
in step S222, it is determined whether the air conditioner 100 collects the reversing signal of the four-way valve 120 twice within 10 min. When the air conditioner 100 collects the reversing signal of the four-way valve 120 twice within 10min, it is indicated that the defrosting of the air conditioner 100 is finished and the air conditioner enters a normal heating mode, and it is required to detect whether the oil blockage exists or not, and the process proceeds to step S231. Otherwise, when the air conditioner 100 collects the reversing signal of the four-way valve 120 for less than two times within 10min, the collection of the reversing signal of the four-way valve 120 is continued until the reversing signal of the four-way valve 120 is collected for two times within the next 10 min.
Step S231, sequentially acquiring the current pressure value P of the refrigerant at the pressure stop valve according to the time interval of 0.5 seconds;
step S232, judging whether the current pressure value P is smaller than 0.5Mpa or not.
And step S240, closing the pressure stop valve when the current pressure value P is smaller than 0.5Mpa, recording the duration time T of the pressure stop valve in a closed state, and confirming the oil blockage fault when the duration time T of the pressure stop valve in the closed state is larger than 3 minutes.
Specifically, in the above embodiment, after sequentially determining whether the current pressure value P is less than 0.5Mpa in step S232, the method further includes: when the current pressure value P is larger than the preset first threshold value 0.5Mpa, the pressure stop valve is kept in an open state; and returning to the step of judging whether the air conditioner 100 is in the non-defrosting operation mode. That is, when the current pressure value P is greater than the preset first threshold value 0.5Mpa, it is indicated that the compressor 110 is operating normally, there is no shortage of combustible refrigerant supply, and the air conditioner 100 can continue to operate normally, and wait for the next defrosting to end, and then detect whether there is an oil blockage.
Referring to fig. 4, further, in a first embodiment of the method for detecting an oil blockage fault of an air conditioner according to the present invention, in a second embodiment of the method for detecting an oil blockage fault of an air conditioner according to the present invention, the step S240 of closing the pressure stop valve when the current pressure value is smaller than the preset first threshold value, and recording the duration of the pressure stop valve in the closed state, and when the duration of the pressure stop valve in the closed state is greater than the preset first duration threshold value, determining that the air conditioner is an oil blockage fault specifically includes:
step S241, closing the pressure stop valve when the current pressure value P is smaller than the preset first threshold value P1, and recording a first current time t1.
When the current pressure value P is smaller than the preset first threshold value P1, it indicates that the pressure of the refrigerant in the circulation system of the air conditioner 100 is small enough to promote the normal flow of the refrigerant, and at this time, the pressure stop valve is closed, and a first current time t1 is recorded for further determination.
Step S242, sequentially obtaining the current pressure value P of the refrigerant at the pressure stop valve according to the time interval S0, and sequentially determining whether the current pressure value P is smaller than a preset second value P2.
And when the current pressure value P is smaller than the preset first threshold value P1, closing the pressure stop valve, continuously acquiring the current pressure value P of the refrigerant at the pressure stop valve in sequence according to the time interval S0, and sequentially judging whether the current pressure value P is smaller than a preset second value P2.
Step S243, when the current pressure value P is smaller than the second threshold value P2, continuing to close the pressure stop valve, and recording a second current time t2.
When the current pressure value P is smaller than the second threshold value P2, it indicates that the pressure of the refrigerant in the circulation system of the air conditioner 100 is still smaller and still insufficient to promote the normal flow of the refrigerant, and at this time, the pressure stop valve is continuously closed, and the first current time t2 is recorded for further determination.
Step S244, determining a duration T of the pressure cut-off valve in the closed state according to the first current time T1 and the second current time T2, and determining whether the duration T of the pressure cut-off valve in the closed state is greater than the first duration threshold T1;
step S245, when the duration T of the closed state of the pressure cut-off valve is greater than the preset first duration threshold T1, confirming that the oil blockage is a fault.
Calculating the duration T of the closed state of the pressure cut-off valve, if the duration T of the closed state of the pressure cut-off valve is greater than a preset first duration threshold T1, it is indicated that the pressure of the refrigerant in the circulation system of the air conditioner 100 has remained relatively low for a period of time, and the refrigerant cannot normally flow for a period of time, and at this time, it can be determined that the circulation system of the air conditioner 100 has an oil blockage fault.
Further, in this second embodiment, after the step S244, the steps further include:
step S246, opening the pressure cut-off valve when the current pressure value is greater than or equal to the second threshold value.
That is, after the current pressure value P is smaller than the preset first threshold value P1, when the current pressure value P is detected to be greater than or equal to the second threshold value P2 again in a short time, it is indicated that the pressure of the refrigerant in the circulation system of the air conditioner 100 is recovered to be normal again, and the pressure stop valve is opened at this time, so that the air conditioner 100 continues to work normally. Such a case may be generally the same misjudgment, accidental abnormality of test data caused by external impact on the air conditioner or other cases, or the case where refrigerant oil blockage in the circulation system of the air conditioner 100 is dispersed and thus automatically returns to normal, or the like.
Specifically, in this second embodiment, the time interval may be 0.1 to 1 second; the second threshold is greater than the first threshold, and the second threshold may be 0-0.2Mpa; the first persistence threshold may be 1-5 minutes.
Referring to fig. 5, further, in the first embodiment of the method for detecting an oil blockage failure of an air conditioner according to the present invention, in the third embodiment of the method for detecting an oil blockage failure of an air conditioner according to the present invention, step S230 includes, after sequentially obtaining, at preset time intervals, a current pressure value of a refrigerant at the pressure stop valve when the air conditioner is in a non-defrosting operation mode, and sequentially determining whether the current pressure value is smaller than a preset first threshold, the steps of:
step S251, when the current pressure value is greater than the preset first threshold value, keeping the pressure stop valve in an open state.
Specifically, when the current pressure value is greater than or equal to the first threshold value, it indicates that the pressure of the refrigerant in the circulation system of the air conditioner 100 is normal, and the refrigerant (i.e., the refrigerant) may flow normally; the pressure cutoff valve is maintained in an opened state so that the air conditioner 100 continues to operate normally.
Further, in this third embodiment, after the step S251, the method further includes the steps of:
step S252, when the current pressure value P is greater than the preset first threshold value P1, recording a duration T of time when the pressure stop valve is in an open state calculated from the current time, and determining whether the duration T of time when the pressure stop valve is in an open state is greater than a preset second duration threshold value T2;
step S253, returning to the step S220 of determining whether the air conditioner is in the non-defrosting operation mode when the duration T of the open state of the pressure cut-off valve is greater than the preset second duration threshold T2.
In this embodiment, in the heating mode for the low temperature condition, the outdoor heat exchanger 130 of the air conditioner 100 absorbs heat and the indoor heat exchanger 150 releases heat, and the air conditioner 100 needs to defrost the outdoor heat exchanger at regular time due to the low outdoor temperature; in the non-defrosting operation mode of the heating mode, the flammable refrigerant (R290 refrigerant) in the air conditioner 100 generally only needs to enter the condenser (outdoor heat exchanger 130) through the throttling device 140 (for example, expansion valve) by the ultralow temperature refrigerant and the lubricating oil in the evaporator (indoor heat exchanger 150) when the four-way valve is reversed after defrosting is finished, which can cause the throttling device to be blocked by the oil with relatively high viscosity, so that the flammable refrigerant cannot participate in the circulation. In the second continuous threshold T2 after the current pressure value P is greater than the preset first threshold P1, the current pressure values P are all greater than the preset first threshold P1, which indicates that the air conditioner 100 is operating normally at this time, and it is not necessary to determine whether an oil blockage fault occurs.
The invention also provides an air conditioner, wherein the refrigerant used by the air conditioner is a flammable refrigerant, and the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a pressure stop valve which is connected with the throttling device in series and is arranged on one side of the throttling device close to the outdoor heat exchanger; the air conditioner further comprises a memory, a processor and an air conditioner fault diagnosis program stored in the memory and capable of running on the processor, wherein the air conditioner fault diagnosis program, when executed by the processor, realizes the steps of the air conditioner oil blockage fault detection method according to any embodiment, and specifically comprises the following steps:
step S210, judging whether the working state of the air conditioner is a heating working mode;
step S220, judging whether the air conditioner is in a non-defrosting working mode or not when the working state of the air conditioner is a heating working mode;
step S230, when the air conditioner is in the non-defrosting operation mode, sequentially obtaining a current pressure value P of the refrigerant at the pressure stop valve according to a preset time interval S0, and sequentially judging whether the current pressure value P is smaller than a preset first threshold value P1;
and step S240, closing the pressure stop valve when the current pressure value P is smaller than the first threshold value P1, recording the duration time T of the pressure stop valve in a closed state, and confirming that the oil blockage is fault when the duration time T of the pressure stop valve in the closed state is larger than a preset first duration threshold value T1.
According to the air conditioner provided by the embodiment, whether the stop valve is opened or not is selected by judging the relative magnitude of the current pressure value of the refrigerant, which is connected with the throttling device in series and is arranged at the pressure stop valve at one side of the throttling device, which is close to the outdoor heat exchanger, and a preset threshold value, after defrosting, so that the speed of extracting the refrigerant by the compressor is controlled, the pressure difference before and after throttling of the refrigerant is avoided to be too large, and the problem of oil blockage of a throttling part caused by too low temperature after throttling is avoided. The expansion valve oil blocking phenomenon caused by the increase of the viscosity of the flammable refrigerant after low-temperature defrosting of the air conditioner can be timely detected, the reliability of an air conditioning system is improved, the service lives of the compressor and the air conditioning system are ensured, the use comfort of the air conditioning system is optimized, and the user experience is improved.
In an optional embodiment, when the operation state of the air conditioner 100 is the heating operation mode in step S220, the step of determining whether the air conditioner 100 is in the non-defrosting operation mode may include:
when the operating state of the air conditioner 100 is the heating state, it is determined whether the number of commutations of the four-way valve 120 received in the second preset time M after the first preset time C0 of the start-up operation of the air conditioner 100 is greater than the preset number of times N, so as to determine whether the air conditioner 100 is in the non-defrosting operating mode.
The first preset time C0 can be 10-40 min, specifically can be 10min, 15min, 20min, 30min, 40min and the like, and the second preset time M can be 10-30 min, specifically can be 10min, 15min, 20min, 30min and the like; the N times of the commutation signal may be two times, three times, four times, etc., which is not limited in the present invention.
Specifically, the value of the first predetermined time C0 cannot be too small, so as to prevent the user from being unable to determine the defrosting operation due to the misoperation when the air conditioner 100 is started.
The time interval S0 may be set according to the actual operation condition of the air conditioner 100, but in the above embodiment, the time interval S0 may be 0.1-1 second, specifically, may be 0.1 second, 0.3 second, 0.5 second, 0.8 second, 1 second, or the like, which is not limited in this invention. Specifically, the value of the time interval S0 of the pressure acquisition cannot be too large, when the circulation system of the air conditioner 100 is blocked, the pressure of the downstream of the throttling component 140 can be rapidly reduced to be below 0, and the smaller the value of S0 is, the more accurate the blocking problem of the circulation system can be detected, so that the system reliability is improved.
The preset first threshold P1 may be set according to the actual operation condition of the air conditioner 100, and in the above embodiment, the preset first threshold P1 is 0.1-0.2Mpa.
Further, in an embodiment, the preset first duration threshold T1 in the step S240 may be set according to the actual operation condition of the air conditioner 100, and in the above embodiment, the preset first duration threshold T1 may be 1-5 minutes. In general, the value of the preset first duration threshold T1 cannot be too large, because the closing of the pressure cut-off valve for a long time may cause the circulation of the system refrigerant to be poor, which affects the comfort of the user.
Further, in an embodiment, after confirming that the oil blockage fault occurs, the shortage of the flammable refrigerant will cause the compressor 110 to idle, thereby affecting the service life of the compressor 110, and therefore, it is necessary to prompt the user to immediately adjust the usage status of the air conditioner 100 or turn off the air conditioner 100. In other embodiments, after confirming that the oil blockage fault occurs, the processor may also directly turn off the compressor 110 of the air conditioner 100 and send out a corresponding prompt message. Specifically, the prompt information may be alarm sound or flashing of an indicator light, or may be text information or graphic information displayed on a panel of the indoor unit, a line controller or a remote controller.
Further, when the air conditioner fault diagnosis program is executed by the processor, it further realizes:
step S241, closing the pressure stop valve and recording a first current time t1 when the current pressure value P is smaller than the preset first threshold value P1;
step S242, sequentially obtaining the current pressure value P of the refrigerant at the pressure stop valve according to the time interval S0, and sequentially judging whether the current pressure value P is smaller than a preset second value P2;
step S243, when the current pressure value P is smaller than the second threshold value P2, continuing to close the pressure stop valve, and recording a second current time t2;
step S244, determining a duration T of the pressure cut-off valve in the closed state according to the first current time T1 and the second current time T2, and determining whether the duration T of the pressure cut-off valve in the closed state is greater than the first duration threshold T1;
step S245, when the duration T of the closed state of the pressure cut-off valve is greater than the preset first duration threshold T1, confirming that the oil blockage is a fault.
Further, when the air conditioner fault diagnosis program is executed by the processor, after the step S244, it is further implemented that:
step S246, opening the pressure cut-off valve when the current pressure value is greater than or equal to the second threshold value.
Specifically, the time interval may be 0.1 to 1 second; the second threshold is greater than the first threshold, and the second threshold may be 0-0.2Mpa; the first persistence threshold may be 1-5 minutes.
Further, when the air conditioner fault diagnosis program is executed by the processor, after the step S230, it is further implemented that:
step S251, when the current pressure value is greater than the preset first threshold value, keeping the pressure stop valve in an open state.
Further, when the air conditioner fault diagnosis program is executed by the processor, after the step S251:
step S252, when the current pressure value P is greater than the preset first threshold value P1, recording a duration T of time when the pressure stop valve is in an open state calculated from the current time, and determining whether the duration T of time when the pressure stop valve is in an open state is greater than a preset second duration threshold value T2;
step S253, returning to the step S220 of determining whether the air conditioner is in the non-defrosting operation mode when the duration T of the open state of the pressure cut-off valve is greater than the preset second duration threshold T2.
The invention also provides a computer storage medium, on which an air conditioner fault diagnosis program is stored, which when executed by a processor, realizes all the steps of the fault diagnosis method of the three-pipe air conditioner.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, including several instructions for causing a multi-connected air conditioning device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. The method is characterized in that the refrigerant used by the air conditioner is combustible refrigerant, and the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a pressure stop valve which is connected with the throttling device in series and is arranged on one side of the throttling device close to the outdoor heat exchanger; the method for detecting the oil blockage fault of the air conditioner comprises the following steps:
judging whether the working state of the air conditioner is a heating working mode or not;
when the working state of the air conditioner is a heating working mode, judging whether the air conditioner is in a non-defrosting working mode or not;
when the air conditioner is in a non-defrosting working mode, sequentially acquiring the current pressure value of the refrigerant at the pressure stop valve according to a preset time interval, and sequentially judging whether the current pressure value is smaller than a preset first threshold value;
and when the current pressure value is smaller than the first threshold value, closing the pressure stop valve, recording the duration of the closed state of the pressure stop valve, and when the duration of the closed state of the pressure stop valve is larger than a preset first duration threshold value, confirming that the oil blockage is caused.
2. The method for detecting an oil blockage fault of an air conditioner according to claim 1, wherein the step of closing the pressure cutoff valve and recording a duration of time that the pressure cutoff valve is in a closed state when the current pressure value is smaller than the preset first threshold value, and determining that the oil blockage fault is caused when the duration of time that the pressure cutoff valve is in the closed state is greater than the preset first duration threshold value comprises:
when the current pressure value is smaller than the first threshold value, closing the pressure stop valve, and recording a first current time;
sequentially obtaining the current pressure value of the refrigerant at the pressure stop valve according to the time interval, and sequentially judging whether the current pressure value is smaller than a preset second threshold value;
when the current pressure value is smaller than the second threshold value, continuing to close the pressure stop valve, and recording a second current time;
determining the duration time of the pressure cut-off valve in a closed state according to the first current time and the second current time, and judging whether the duration time of the pressure cut-off valve in the closed state is larger than the first duration threshold value;
and confirming that the oil blockage is fault when the duration of the pressure cut-off valve in the closed state is larger than a preset first duration threshold value.
3. The method for detecting an oil blockage failure of an air conditioner according to claim 2, wherein the step of sequentially obtaining the current pressure value of the refrigerant at the pressure cut-off valve at the time interval and sequentially judging whether the current pressure value is smaller than a preset second value further comprises:
and opening the pressure stop valve when the current pressure value is greater than or equal to the second threshold value.
4. The method for detecting an oil blockage failure of an air conditioner according to any one of claims 2 to 3, wherein the time interval is 0.1 to 1 second; the second threshold value is larger than the first threshold value, and the second threshold value is 0-0.2Mpa; the first duration threshold is 1-5 minutes.
5. The method for detecting an oil blockage failure of an air conditioner according to any one of claims 2 to 3, wherein the step of confirming that the oil blockage failure occurs when the duration of the pressure cut-off valve in the closed state is greater than a preset first duration threshold value further comprises:
and closing the compressor of the air conditioner and sending out corresponding prompt information.
6. The method for detecting an oil blockage failure of an air conditioner according to claim 1, wherein the step of determining whether the air conditioner is in a non-defrosting operation mode when the operation state of the air conditioner is a heating operation mode comprises:
when the working state of the air conditioner is a heating state, judging whether the reversing times of the four-way valve received by the air conditioner in a second preset time after the first preset time of starting operation is larger than the preset times or not so as to judge whether the air conditioner is in a non-defrosting working mode or not.
7. The method for detecting a blockage of an air conditioner according to claim 6, wherein the first preset time is 10-40 minutes and the second preset time is 10-30 minutes.
8. The method for detecting an oil blockage failure of an air conditioner according to claim 1, wherein when the air conditioner is in a non-defrosting operation mode, the steps of sequentially acquiring a current pressure value of the refrigerant at the pressure cut-off valve according to a preset time interval, and sequentially judging whether the current pressure value is smaller than a preset first threshold value further comprise:
and when the current pressure value is larger than the preset first threshold value, the pressure stop valve is kept in an open state.
9. The method for detecting an oil blockage failure of an air conditioner according to claim 8, wherein the step of maintaining the pressure cutoff valve in an open state when the current pressure value is greater than the preset first threshold value further comprises:
when the current pressure value is larger than the preset first threshold value, recording the duration time of the pressure cut-off valve in the open state calculated from the current time, and judging whether the duration time of the pressure cut-off valve in the open state is larger than a preset second duration threshold value or not;
and returning to the step of judging whether the air conditioner is in a non-defrosting working mode when the duration of the pressure cut-off valve in the opening state is larger than a preset second duration threshold.
10. The air conditioner is characterized in that the refrigerant used by the air conditioner is a flammable refrigerant, and the air conditioner comprises a compressor, a four-way valve, an outdoor heat exchanger, a throttling device, an indoor heat exchanger and a pressure stop valve which is connected with the throttling device in series and is arranged on one side of the throttling device close to the outdoor heat exchanger;
the air conditioner further comprises a memory, a processor and an air conditioner fault diagnosis program stored on the memory and capable of running on the processor, wherein the air conditioner fault diagnosis program realizes the steps of the air conditioner oil blockage fault detection method according to any one of claims 1 to 9 when being executed by the processor.
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| CN108036462B (en) * | 2017-11-29 | 2020-06-23 | 广东美的制冷设备有限公司 | Air conditioner oil blockage fault detection method and air conditioner |
| CN109410612B (en) * | 2018-11-06 | 2021-03-12 | 广东京安交通科技有限公司 | Signal lamp for pedestrian crossing |
| CN115076869A (en) * | 2022-05-25 | 2022-09-20 | 青岛海尔空调器有限总公司 | Oil blockage preventing method and device for air conditioner, air conditioner and storage medium |
| CN115164458B (en) * | 2022-07-26 | 2023-10-13 | 海信空调有限公司 | Air conditioner and oil blocking prevention control method thereof |
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