CN110793170B - Judgment method for insufficient refrigerant of air conditioning system and air conditioner - Google Patents
Judgment method for insufficient refrigerant of air conditioning system and air conditioner Download PDFInfo
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- CN110793170B CN110793170B CN201911107479.8A CN201911107479A CN110793170B CN 110793170 B CN110793170 B CN 110793170B CN 201911107479 A CN201911107479 A CN 201911107479A CN 110793170 B CN110793170 B CN 110793170B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/37—Resuming operation, e.g. after power outages; Emergency starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
Abstract
The invention provides a method for judging insufficient refrigerant of an air conditioning system and an air conditioner, and belongs to the field of judgment of refrigerant leakage of a variable frequency air conditioner. In order to solve the problem that the method for judging the insufficient refrigerant of the existing variable frequency air conditioner is inaccurate, the invention comprises the following steps: after the air conditioner is started to operate, judging whether the exhaust temperature is larger than or equal to a preset value B or not when the operation time of the compressor reaches preset time A, quitting the judgment if the exhaust temperature is not larger than the preset value B, recovering the normal operation, stopping the air conditioner if the exhaust temperature is not larger than the preset value B, and increasing the initial opening degree of the electronic expansion valve by a preset value D after the air conditioner is started after the shutdown time reaches preset time C; judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation. By the scheme of controlling the exhaust temperature of the compressor after starting and running, controlling the opening degree of the expansion valve and repeatedly judging for many times, the characteristic of insufficient refrigerant can be effectively reflected and accurately judged in each use scene of the system.
Description
Technical Field
The invention relates to the field of judgment of refrigerant leakage of a variable frequency air conditioner, in particular to the field of judgment of refrigerant leakage of the variable frequency air conditioner.
Background
Present inverter air conditioner refrigerant is because the leakage leads to the system operation unusual be the most outstanding also the most general problem of feedback in market after sale, the system operation can be in abnormal state after the air conditioner refrigerant is not enough, not only system heat transfer performance can not full play, refrigeration heating effect is poor, still can bring exhaust temperature height and lead to the system exhaust height to shut down repeatedly, make the ageing aggravation of compressor lubricating oil, thereby lead to compressor life to shorten by a wide margin, still can make the frosting accelerate when low temperature heats simultaneously, the frosting cycle shortens, bring very poor use experience for the consumer. Meanwhile, the adoption of an R32 environment-friendly refrigerant is an industry development trend, and the R32 refrigerant has the characteristics that one refrigerant has a combustion and explosion risk, and the other refrigerant has higher exhaust temperature of a system and is particularly important for controlling the exhaust temperature. Therefore, for the R32 refrigerant system, it is necessary to determine and feedback the shortage of the system refrigerant.
The existing industry solution is mainly to judge according to the system running current, the temperature of the inner and outer coil pipes and the difference value of the inner and outer environment temperatures, and judge that the system refrigerant is insufficient when the running current is small and the temperature difference is too small, although the control logic is also an important characteristic of insufficient system refrigerant, because the variable frequency air conditioner triggers the refrigerant shortage judgment of the control logic under normal use conditions due to frequency change, system protection, set temperature difference and other reasons in different use scenes, the system misjudgment is caused, the shutdown or the misfeedback is caused to the after-sale, the poor use experience is brought to consumers, and unnecessary troubleshooting work is also added to the after-sale.
Disclosure of Invention
The invention aims to provide a method for judging insufficient refrigerant of an air conditioning system and an air conditioner, and solves the problem that the method for judging insufficient refrigerant of the existing variable frequency air conditioner is inaccurate.
The invention solves the technical problem, and adopts the technical scheme that: the method for judging the insufficient refrigerant of the air conditioning system comprises the following steps:
s1, after the air conditioner is started to operate, when the operation time of the compressor reaches the preset time A, executing the step S2;
s2, judging whether the exhaust temperature is larger than or equal to a preset value B; if yes, executing the step S3, otherwise, quitting the judgment and recovering the normal operation;
s3, stopping the air conditioner, and executing the step S4 when the stop time reaches the preset time C;
s4, increasing the initial opening of the electronic expansion valve by a preset value D after starting up;
s5, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
Specifically, in step S1, the preset time a is in a range of 1 to 15 minutes, and the preset time a is 8 minutes.
Further, in step S5, when it is determined whether the exhaust temperature is greater than or equal to the preset value B, if yes, the method further includes the following steps:
s6, stopping the air conditioner, and executing the step S7 when the stop time reaches the preset time C;
s7, increasing the initial opening of the electronic expansion valve by a preset value E after starting up;
s8, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
Specifically, in step S7, the range of the preset value E is 60-120 steps, and the preset value E is 100 steps.
Further, in step S2, the range of the preset value B is 105 to 120 ℃, and the preset value B is 113 ℃.
Specifically, in steps S3 and S6, the preset time C ranges from 3 minutes to 15 minutes, and the preset time C is 10 minutes.
Further, in step S4, the range of the preset value D is 30-80 steps, and the preset value D is 50 steps.
The air conditioner is applied to the judgment method for insufficient refrigerant of the air conditioning system, comprises an exhaust temperature acquisition module and further comprises the following steps: the control module is respectively connected with the clock module, the temperature acquisition module and the electronic expansion valve;
the temperature acquisition module is used for acquiring the exhaust temperature and transmitting the exhaust temperature to the control module;
the clock module is used for adjusting and timing time frequency;
the electronic expansion valve is used for controlling the opening degree and adjusting the flow of the refrigerant;
the control module is used for judging whether the exhaust temperature is greater than or equal to a preset value B according to the exhaust temperature, controlling the air conditioner to stop if the exhaust temperature is greater than or equal to the preset value B, increasing the initial opening of the electronic expansion valve by a preset value D after the air conditioner is started up after the stop time reaches preset time C, then judging whether the exhaust temperature is greater than or equal to the preset value B again, stopping the air conditioner and not automatically starting the air conditioner again if the exhaust temperature is greater than or equal to the preset value B, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
Specifically, the temperature acquisition module is a temperature sensor.
The method for judging the shortage of the refrigerant in the air conditioning system and the air conditioner have the advantages that through the scheme for judging the shortage of the refrigerant in the air conditioning system, the exhaust temperature condition of the compressor after starting operation, the opening degree of the expansion valve and repeated judgment, the characteristic of the shortage of the refrigerant can be effectively embodied and accurately judged in each use scene of the system, abnormal faults can be fed back in time, after-sale timely treatment is facilitated, and potential safety hazards can be eliminated in time for the leakage risk of flammable and explosive refrigerants such as R32 and the operation risk caused by the shortage of the refrigerant.
Drawings
Fig. 1 is a flowchart of a method for determining refrigerant shortage of an air conditioning system according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the embodiments and the accompanying drawings.
The invention relates to a method for judging insufficient refrigerant of an air conditioning system, which comprises the following steps:
s1, after the air conditioner is started to operate, when the operation time of the compressor reaches the preset time A, executing the step S2;
s2, judging whether the exhaust temperature is larger than or equal to a preset value B; if yes, executing the step S3, otherwise, quitting the judgment and recovering the normal operation;
s3, stopping the air conditioner, and executing the step S4 when the stop time reaches the preset time C;
s4, increasing the initial opening of the electronic expansion valve by a preset value D after starting up;
s5, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
In the method, in step S1, the preset time a is in a range of 1 to 15 minutes, and the preset time a is preferably 8 minutes.
In step S5, when it is determined whether the exhaust temperature is greater than or equal to the preset value B, if yes, the method further includes the following steps:
s6, stopping the air conditioner, and executing the step S7 when the stop time reaches the preset time C;
s7, increasing the initial opening of the electronic expansion valve by a preset value E after starting up;
s8, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
In step S7, the range of the preset value E is 60-120 steps, and the preset value E is preferably 100 steps.
In step S2, the range of the preset value B is 105 to 120 ℃, and the preset value B is preferably 113 ℃.
In steps S3 and S6, the preset time C is in a range of 3 to 15 minutes, and the preset time C is preferably 10 minutes.
In step S4, the range of the preset value D is 30-80 steps, and the preset value D is preferably 50 steps.
The air conditioner is applied to the judgment method for insufficient refrigerant of the air conditioning system, comprises an exhaust temperature acquisition module and further comprises the following steps: the control module is respectively connected with the clock module, the temperature acquisition module and the electronic expansion valve; the temperature acquisition module is used for acquiring the exhaust temperature and transmitting the exhaust temperature to the control module; the clock module is used for adjusting and timing time frequency; the electronic expansion valve is used for controlling the opening degree and adjusting the flow of the refrigerant; the control module is used for judging whether the exhaust temperature is greater than or equal to a preset value B according to the exhaust temperature, controlling the air conditioner to stop if the exhaust temperature is greater than or equal to the preset value B, increasing the initial opening of the electronic expansion valve by a preset value D after the air conditioner is started up after the stop time reaches preset time C, then judging whether the exhaust temperature is greater than or equal to the preset value B again, stopping the air conditioner and not automatically starting the air conditioner again if the exhaust temperature is greater than or equal to the preset value B, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
In the above device, the temperature acquisition module is preferably a temperature sensor.
Examples
The flow chart of the method for judging the insufficient refrigerant of the air conditioning system in the embodiment of the invention is shown in figure 1, wherein the method comprises the following steps:
s1, after the air conditioner is started to operate, when the operation time of the compressor reaches the preset time A, executing the step S2;
s2, judging whether the exhaust temperature is larger than or equal to a preset value B; if yes, executing the step S3, otherwise, quitting the judgment and recovering the normal operation;
s3, stopping the air conditioner, and executing the step S4 when the stop time reaches the preset time C;
s4, increasing the initial opening of the electronic expansion valve by a preset value D after starting up;
s5, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation;
s6, stopping the air conditioner, and executing the step S7 when the stop time reaches the preset time C;
s7, increasing the initial opening of the electronic expansion valve by a preset value E after starting up;
s8, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
In the above method, in step S1, the preset time a is 8 minutes. In step S7, the preset value E is 100 steps. In step S2, the preset value B is 113 ℃. In steps S3 and S6, the preset time C is 10 minutes. In step S4, the preset value D is 50 steps.
In the embodiment, the characteristic of insufficient refrigerant can be effectively reflected and accurately judged in each use scene of the system through the scheme of controlling the exhaust temperature of the compressor, the opening degree of the expansion valve and repeatedly judging for many times after starting and running.
When the method is applied specifically, after the air conditioner is started to operate, after the compressor operates for a certain time, whether the exhaust temperature meets a preset value or not is preliminarily judged, when the preset condition is met, the air conditioner is stopped, the air conditioner is started after the stop time reaches the preset time, the opening of the electronic expansion valve is increased by a preset value on the basis of the original initial opening during starting, the operation is started again, if the exhaust temperature still exceeds the preset value, the air conditioner is stopped again, the operation is started again after the stop time reaches the preset time, at the moment, the opening of the electronic expansion valve is increased by a larger preset value on the basis of the original initial opening, the operation is started again, and if the exhaust temperature is too high and exceeds the preset value, the air conditioner is stopped, and a fault code of insufficient refrigerant of the system is reported; otherwise, if the exhaust temperature does not meet the preset value in the process, the judgment is quitted, and the system recovers the normal operation; in order to further confirm the shortage of the system refrigerant, the initial opening degree of the electronic expansion valve can be adjusted to be increased for multiple times, and the judgment is not limited to be performed twice.
Therefore, the performance and reliability problems caused by insufficient refrigerant of the system are solved, according to the abnormal condition of the exhaust temperature of the system under the abnormal condition and the control of the opening degree of the electronic expansion valve after the system is shut down, after the exhaust reaches a preset value and the electronic expansion valve is shut down, the initial opening degree of the electronic expansion valve during starting up is increased, the exhaust temperature is reduced, the electronic expansion valve is repeatedly operated if the electronic expansion valve is still shut down, the electronic expansion valve is still shut down after being repeatedly opened, the shortage of the refrigerant of the system can be determined, the normal use requirement cannot be met, at the moment, the electronic expansion valve is shut down without automatic starting, meanwhile, fault code feedback is reported, after-sale maintenance is convenient, and potential safety hazards can be eliminated in time as well as the leakage risk of flammable and explosive refrigerants such as R32 and the operation risk caused by insufficient refrigerants.
Claims (8)
1. The method for judging the insufficient refrigerant of the air conditioning system is characterized by comprising the following steps of:
s1, after the air conditioner is started to operate, when the operation time of the compressor reaches the preset time A, executing the step S2;
s2, judging whether the exhaust temperature is larger than or equal to a preset value B; if yes, executing the step S3, otherwise, quitting the judgment and recovering the normal operation;
s3, stopping the air conditioner, and executing the step S4 when the stop time reaches the preset time C;
s4, increasing the initial opening of the electronic expansion valve by a preset value D after starting up;
s5, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system refrigerant shortage fault code is met, stopping the machine, not automatically starting the machine, entering the step S6, and simultaneously reporting the system refrigerant shortage fault code; if not, quitting the judgment and recovering the normal operation;
s6, stopping the air conditioner, and executing the step S7 when the stop time reaches the preset time C;
s7, increasing the initial opening of the electronic expansion valve by a preset value E after starting up;
s8, judging whether the exhaust temperature is larger than or equal to a preset value B again; if the system is satisfied, stopping the machine and not automatically starting the machine, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
2. The method for determining refrigerant shortage of an air conditioning system as claimed in claim 1, wherein the predetermined time A is in a range of 1 to 15 minutes, and the predetermined time A is 8 minutes in step S1.
3. The method as claimed in claim 1, wherein the preset value E ranges from 60 to 120 steps, and the preset value E is 100 steps in step S7.
4. The method as claimed in claim 1, wherein the predetermined value B is 105-120 ℃ and 113 ℃ in step S2.
5. The method as claimed in claim 1, wherein the predetermined time period C is 3-15 minutes and 10 minutes in steps S3 and S6.
6. The method for determining refrigerant shortage of an air conditioning system as claimed in claim 1, wherein in step S4, the range of the preset value D is 30-80 steps, and the preset value D is 50 steps.
7. The air conditioner is applied to the judgment method for insufficient refrigerant of the air conditioning system according to any one of claims 1 to 6, and comprises an exhaust temperature acquisition module, and is characterized by further comprising the following steps: the control module is respectively connected with the clock module, the temperature acquisition module and the electronic expansion valve;
the temperature acquisition module is used for acquiring the exhaust temperature and transmitting the exhaust temperature to the control module;
the clock module is used for adjusting and timing time frequency;
the electronic expansion valve is used for controlling the opening degree and adjusting the flow of the refrigerant;
the control module is used for judging whether the exhaust temperature is greater than or equal to a preset value B according to the exhaust temperature, controlling the air conditioner to stop if the exhaust temperature is greater than or equal to the preset value B, increasing the initial opening of the electronic expansion valve by a preset value D after the air conditioner is started up after the stop time reaches preset time C, then judging whether the exhaust temperature is greater than or equal to the preset value B again, stopping the air conditioner and not automatically starting the air conditioner again if the exhaust temperature is greater than or equal to the preset value B, and simultaneously reporting a fault code of insufficient refrigerant of the system; if not, quitting the judgment and recovering the normal operation.
8. The air conditioner of claim 7, wherein the temperature acquisition module is a temperature sensor.
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| CN201911107479.8A CN110793170B (en) | 2019-11-13 | 2019-11-13 | Judgment method for insufficient refrigerant of air conditioning system and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111520870B (en) * | 2020-03-26 | 2022-05-10 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN113432240B (en) * | 2021-06-30 | 2022-09-30 | 海信（广东）空调有限公司 | Method and device for detecting refrigerant leakage, air conditioner and storage medium |
| CN113847703B (en) * | 2021-10-29 | 2023-08-15 | 海信（广东）空调有限公司 | Refrigerant leakage detection method of dehumidifier |
| CN113969889A (en) * | 2021-11-18 | 2022-01-25 | 四川长虹空调有限公司 | Preheating control method and system for variable frequency compressor |
| CN115111710A (en) * | 2022-06-23 | 2022-09-27 | 北京小米移动软件有限公司 | Air conditioner control method, device, medium and chip |
| CN115289734B (en) * | 2022-08-16 | 2023-07-14 | 宁波奥克斯电气股份有限公司 | Compressor exhaust temperature control method and device, storage medium and air conditioner |
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| JP6088753B2 (en) * | 2012-06-13 | 2017-03-01 | サンデンホールディングス株式会社 | Air conditioner for vehicles |
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| CN101629753A (en) * | 2008-07-14 | 2010-01-20 | 三星电子株式会社 | Air-conditioner and control method thereof |
| CN106016579A (en) * | 2016-05-10 | 2016-10-12 | 广东美的制冷设备有限公司 | Air-conditioner system and subsection control method and device for preventing refrigerant leakage |
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