CN113639399A - Refrigerant missing fault determination method and device, air conditioner and computer storage medium - Google Patents

Refrigerant missing fault determination method and device, air conditioner and computer storage medium Download PDF

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CN113639399A
CN113639399A CN202110980309.1A CN202110980309A CN113639399A CN 113639399 A CN113639399 A CN 113639399A CN 202110980309 A CN202110980309 A CN 202110980309A CN 113639399 A CN113639399 A CN 113639399A
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press
compressor
temperature
refrigerant
air conditioner
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CN113639399B (en
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吕明宇
彭子影
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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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
    • 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
    • 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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention provides a refrigerant missing fault judgment method and device, an air conditioner and a computer storage medium, wherein the method is used for a fixed-frequency air conditioner and comprises the following steps: s1: real-time or timed detection of compressor body temperature TPress and pressCompressor discharge temperature TRow boardIndoor heat exchanger coil temperature TDish(ii) a S2: judgment of TRow boardWhether the temperature is greater than or equal to a first preset temperature T'Row board(ii) a S3: if yes, go to step S4; if not, returning to the step S1; s4: calculating and judging TPress and press、TRow boardA first temperature difference value delta T between1＝TPress and press‑TRow boardWhether the temperature difference value is greater than or equal to a first preset temperature difference value delta T'1(ii) a S5: if yes, go to step S6; if not, go to step S7; s6: the compressor is stopped, and the air conditioner displays a refrigerant missing fault code; s7: return is made to step S1. By the refrigerant missing fault judging method and device, the air conditioner and the computer storage medium, the false alarm of the fixed-frequency air conditioner on the refrigerant missing fault is reduced, and the judgment of the fixed-frequency air conditioner on the refrigerant missing fault is more scientific and accurate.

Description

Refrigerant missing fault determination method and device, air conditioner and computer storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a refrigerant missing fault judgment method and device, an air conditioner and a computer storage medium.
Background
At present, the refrigerant medium in the air conditioning system is mainly a fluorine-containing compound, and has the characteristics of easy evaporation and easy liquefaction, heat is absorbed during evaporation, and heat is released during liquefaction, so that the air conditioner realizes energy transfer by utilizing the characteristics, thereby achieving the purposes of refrigeration and heating, but refrigerant loss is also a common fault in the use of the air conditioner.
Taking fluorine-containing compounds as an example, if the air conditioner continues to operate for a long time after being lack of fluorine, the air conditioner has poor refrigerating and heating effects, wastes electric energy, can also cause overheating of the compressor, can reduce the insulation performance and reliability of the motor and shorten the service life of the motor due to the long-time overheating, can also reduce the lubricating capacity of lubricating oil, and can damage the compressor in severe cases. The detection and judgment of the fluorine deficiency logic of the existing household constant-frequency air conditioner generally adopts the temperature T of the coil pipe of the indoor heat exchanger after the air conditioner is started and operated for a certain timeDishWhether the unit is lack of fluorine is judged according to the improvement degree, for example, the temperature of an indoor heat exchanger coil collected when the unit is started is T0The temperature of the coil pipe of the indoor heat exchanger collected after five minutes of starting is T5If | T5-T0If the absolute value is less than the set value, the refrigerating or heating effect of the unit is poor, and the unit is judged to be fluorine-deficient.
However, the detection and judgment of the fluorine-lacking logic have the following defects: if the unit does not lack fluorine, but the refrigerant does not effectively circulate after the unit is started up due to other reasons, such as flow path blockage, compressor failure, circuit failure and the like, the temperature of the coil pipe of the indoor heat exchanger is basically unchanged compared with that during starting up after the air conditioner is started up for a certain time, and the false alarm and fluorine lack are caused, so that the trouble is caused for after-sale maintenance.
Disclosure of Invention
In view of the above, the technical problems to be solved by the present invention are: the first aspect is to provide a refrigerant missing fault determination method, which reduces the false alarm of the fixed-frequency air conditioner on the refrigerant missing fault, so that the determination of the fixed-frequency air conditioner on the refrigerant missing fault is more scientific and accurate.
In order to solve the technical problem of the first aspect, the invention provides a refrigerant loss fault determination method for a fixed-frequency air conditioner, which comprises the following steps:
s1: real-time or timed detection of compressor body temperature TPress and pressCompressor discharge temperature TRow boardIndoor heat exchanger coil temperature TDish；
S2: judgment of TRow boardWhether the temperature is greater than or equal to a first preset temperature T'Row board；
S3: if yes, go to step S4; if not, returning to the step S1;
s4: calculating and judging TPress and press、TRow boardA first temperature difference value delta T between1＝TPress and press-TRow boardWhether the temperature difference value is greater than or equal to a first preset temperature difference value delta T'1；
S5: if yes, go to step S6; if not, go to step S7;
s6: the compressor is stopped, and the air conditioner displays a refrigerant missing fault code;
s7: return is made to step S1.
By adopting the refrigerant missing fault judging method, the false alarm of the fixed-frequency air conditioner on the refrigerant missing fault is reduced, so that the judgment of the fixed-frequency air conditioner on the refrigerant missing fault is more scientific and accurate.
Preferably, step S7 includes the following specific operation steps:
s71: calculating and judging T'Dish、T”DishSecond absolute value of temperature difference Δ T therebetween2＝|T'Dish-T”DishWhether | is less than or equal to second preset temperature difference value delta T'2Of which is T'DishFor step S1 at TRow boardL to T'Row boardThe detected coil temperature, T "DishThe temperature of the coil of the indoor heat exchanger detected when the air conditioner is started in the step S1;
s72: if yes, go to step S6; if not, go to step S73;
s73: return is made to step S1.
The false alarm of the refrigerant missing fault is reduced, and meanwhile, the obvious missing report is not generated, so that the judgment of the refrigerant missing fault by the fixed-frequency air conditioner is more scientific and accurate.
Preferably, step S73 includes the following specific operation steps:
s731: judgment of TPress and pressWhether the temperature is greater than or equal to a second preset temperature T'Press and press；
S732: if yes, go to step S6; if not, go to step S733;
s733: return is made to step S1.
The false alarm of the refrigerant missing fault is reduced, and meanwhile, the probability of missing alarm is further reduced, so that the judgment of the refrigerant missing fault by the fixed-frequency air conditioner is more scientific and accurate.
Preferably, T'Row board+ΔT'1≤T'Press and press＜140℃。
On the basis of further reducing the probability of missing report of the refrigerant missing fault, the condition that the refrigerant is only slightly missing is also considered to be excluded, so that the reasonable control of after-sale maintenance intensity by a user is facilitated, and the after-sale maintenance expense is reduced.
Preferably, step S6 includes the following specific operation steps:
s61: the compressor is stopped, and the stop times X of the compressor are automatically added by 1 progressively;
s62: judging whether X is larger than or equal to N, wherein N is a natural number larger than or equal to 2;
s63: if yes, sequentially executing steps S64-S66; if not, go to step S67;
s64: the compressor keeps a shutdown state, and the air conditioner displays a refrigerant missing fault code;
s65: judging whether the compressor receives a power-off restart instruction or not;
s66: if yes, resetting the compressor by resetting the shutdown time X of the compressor and restarting the compressor, and then returning to the step S1; if not, returning to the step S64;
s67: the compressor is automatically restarted after being stopped for the first preset time period Y, and then the step S1 is returned.
The fixed-frequency air conditioner can further eliminate the influence of some accidental factors of the air conditioner in the actual operation process of the air conditioner for judging the refrigerant missing fault, and further improve the scientificity and accuracy of a judgment result.
Preferably, the compressor body temperature T in step S1Press and pressBy providing a pick-up point in close proximity to the compressor internal winding coil.
T collected by the collection point of the compressor regardless of the specific type of the compressorPress and pressThe value can reflect the highest temperature of the compressor body most, further reflect the influence of the refrigerant sufficiency on the energy distribution in the working process of the compressor most visually, and control the reliability risk of the compressor visually and accurately, so that the judgment result is more scientific and accurate.
Preferably, the compressor discharge temperature T in step S1Row boardBy providing a pick-up point on the discharge pipe at a location more than 150mm from the compressor discharge.
The problem that in a special state, for example, when the compressor is locked is solved, the refrigerant does not flow, the exhaust temperature is not high, and the exhaust temperature collection is influenced by the heat of the compressor body through the heat conduction of the copper pipe is solved. Thereby increasing TRow boardThe real reliability on the collection is further favorable for more scientificalness and accuracy of the judgment result.
The technical problems to be solved by the invention are as follows: a second aspect provides a refrigerant absence failure determination device, and/or a third aspect provides a fixed frequency air conditioner, and/or a fourth aspect provides a computer readable storage medium.
To solve the above technical problem in the second aspect, the present invention provides a refrigerant lack fault determination apparatus for performing the method according to any one of the embodiments of the first aspect, where the apparatus includes:
a detection module for detecting the temperature T of the compressor body in real time or at regular timePress and pressCompressor discharge temperature TRow boardIndoor heat exchanger coil temperature TDish；
A judging module: the judging module is used for judging the T detected by the detecting moduleRow boardValue, TRow boardValue, at the first judgment period, judging TRow boardWhether the temperature is greater than or equal to a first preset temperature T'Row boardCalculating and judging T in the second judging periodPress and press、TRow boardA first temperature difference value delta T between1＝TPress and press-TRow boardWhether the temperature difference value is greater than or equal to a first preset temperature difference value delta T'1；
An execution module: the execution module is used for executing a command of stopping the compressor and displaying a refrigerant missing fault code by the air conditioner;
a control module: the control module is used for controlling the judging module to enter the second judging period when the judging result of the first judging period is yes; the control module is further configured to initiate instruction call to the execution module when the determination result of the second determination period is yes.
To solve the technical problem of the third aspect, the present invention provides a fixed-frequency air conditioner, including a computer-readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed to implement the method according to any one of the embodiments of the first aspect.
To solve the technical problem of the fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the computer program implements the method according to any one of the embodiments of the first aspect.
Compared with the prior art, the refrigerant missing fault judgment method, the refrigerant missing fault judgment device, the air conditioner and the computer storage medium have the following beneficial effects:
1) the false alarm of the constant-frequency air conditioner on the refrigerant missing fault is reduced, so that the judgment of the constant-frequency air conditioner on the refrigerant missing fault is more scientific and accurate;
2) the false alarm of the refrigerant missing fault is reduced, and meanwhile, the missing report is not generated, so that the judgment of the refrigerant missing fault by the fixed-frequency air conditioner is more scientific and accurate.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and are not to limit the invention. In the drawings:
fig. 1 is a schematic frame diagram of a refrigerant deficiency fault determination method according to embodiment 1 of the present invention;
FIG. 2 shows the temperature T of the compressor body in example 1 of the present inventionPress and pressAnd compressor discharge temperature TRow boardSchematic view of the collection point set-up of (1).
Detailed Description
In order to make the aforementioned objects, technical solutions and advantages of the present invention more comprehensible, the present invention is described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only some of the embodiments constituting the present invention, and are not intended to limit the present invention, and the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
As shown in fig. 1-2, the present invention provides a refrigerant missing fault determining method for a fixed-frequency air conditioner, including the following steps:
s1: real-time or timed detection of compressor body temperature TPress and pressCompressor discharge temperature TRow boardIndoor heat exchanger coil temperature TDish；
S2: judgment of TRow boardWhether the temperature is greater than or equal to a first preset temperature T'Row board；
S3: if yes, go to step S4; if not, returning to the step S1;
s4: calculating and judging TPress and press、TRow boardA first temperature difference value delta T between1＝TPress and press-TRow boardWhether the temperature difference value is greater than or equal to a first preset temperature difference value delta T'1；
S5: if yes, go to step S6; if not, go to step S7;
s6: the compressor is stopped, and the air conditioner displays a refrigerant missing fault code;
s7: return is made to step S1.
Specifically, with the refrigerant lack fault determination method of the present invention, the fixed-frequency air conditioner is determined to be refrigerant lack only when the determination conditions in steps S2 and S4 are both sequentially satisfied. Compared with the prior art which only depends on the temperature T of the coil pipe of the indoor heat exchangerDishThe invention reduces the false alarm of the fixed-frequency air conditioner to the refrigerant missing fault, and leads the judgment of the fixed-frequency air conditioner to the refrigerant missing fault to be more scientific and accurate. Wherein, T'Row boardFor example, it may be set to 115 ℃ Δ T'1For example, 15 ℃ may be set, and when the timing detection is performed in step S1, the detection may be set, for example, once per second.
More specifically, refrigerant medium is compressed from a low-temperature low-pressure state to a high-temperature high-pressure state in the compressor and is conveyed to a condenser of the air conditioner along an exhaust pipeline of the compressor, and a large amount of heat generated by the compressor in the process of compressing and applying work to the refrigerant is absorbed by the refrigerant mostly when the refrigerant is sufficient. Because the power of the fixed-frequency air conditioner compressor is constant, T detected after the air conditioner operates stably for a period of timeRow boardThe gaseous refrigerant flowing through the exhaust pipeline of the compressor can be reflected to a certain extent. I.e. at step S2, at TRow boardWhen the temperature is less than 115 ℃, the next judgment is not needed, the sufficiency of the refrigerant is guaranteed, or the air conditioner can be started to operate, and the system operation reliability is basically not influenced in the two states; on the contrary, the refrigerant sufficiency may be insufficient, and the next determination needs to be made by combining other determination conditions.
According to research and test on fixed-frequency air conditionerAnd statistical analysis, under the condition that the compressor normally works, the refrigerant quantity is sufficient and the refrigerant normally circulates, the temperature T of the compressor bodyPress and pressAnd compressor discharge temperature TRow boardA first temperature difference value delta T between1Usually around 10 ℃ and not more than 15 ℃. That is, corresponding to the step S4 for making the next determination, T is satisfiedRow boardNot less than 115 ℃ and when the temperature is delta T1When the temperature is more than or equal to 15 ℃, the refrigerant sufficiency is inevitably insufficient, because the diameter of a discharge return pipe of the air conditioner is large, and the delta T is caused by other reasons such as flow path blockage1Abnormality at TRow boardNot less than 115 ℃ without causing delta T at all1Up to 15 ℃ unless the refrigerant is of a sufficient degree. At this time TPress and pressAt least 130 ℃ is also kept, a large amount of heat generated by the work of the corresponding compressor cannot be taken away due to insufficient refrigerant quantity, and part of heat stays on the compressor body continuously, so that the temperature T of the compressor body is causedPress and pressAbnormal, the high temperature resistance of the inner winding of the compressor is generally about 150 ℃, so when T isPress and pressIf the temperature exceeds 130 ℃ or even approaches 140 ℃, the reliability risk is generated, so that the compressor needs to be immediately stopped, and the air conditioner displays a refrigerant missing fault code.
Preferably, step S7 includes the following specific operation steps:
s71: calculating and judging T'Dish、T”DishSecond absolute value of temperature difference Δ T therebetween2＝|T'Dish-T”DishWhether | is less than or equal to second preset temperature difference value delta T'2Of which is T'DishFor step S1 at TRow boardL to T'Row boardThe detected coil temperature, T "DishThe temperature of the coil of the indoor heat exchanger detected when the air conditioner is started in the step S1;
s72: if yes, go to step S6; if not, go to step S73;
s73: return is made to step S1.
Specifically, in step S4, even when Δ T1The refrigerant sufficiency of all series air-conditioning systems can not be ensured even if the temperature is less than 15 DEG CThe temperature T of the coil pipe of the indoor heat exchanger can be further combined at the momentDishThe degree of improvement of the composition is used for further scientific judgment. It should be noted that the present invention is based on TDishTiming of improvement judgment under the degree of improvement, and TRow boardIs established at T'Row boardThe specific temperature rise timing of (1) is a synchronous correspondence relationship, where Δ T'2The temperature is set to, for example, 2 ℃. And if from start-up to TRow boardWhen the temperature is raised to 115 ℃ or even slightly higher (corresponding to the real-time detection and the timing detection in step S1), TDishThe refrigerant sufficiency can be directly judged to be seriously insufficient according to the reduction of the temperature not to exceed 2 ℃. Namely: after T has been satisfiedRow boardNot less than 115 ℃ and when the temperature is delta T2At 2 deg.C or below, no matter what type of air conditioning system, and no matter what delta T is1Whether the refrigerant is sufficient or not at 15 ℃ or more is inevitably insufficient. Therefore, the false alarm of the refrigerant missing fault is reduced, and meanwhile, the obvious missing report is not generated, so that the judgment of the refrigerant missing fault by the fixed-frequency air conditioner is more scientific and accurate.
Preferably, step S73 includes the following specific operation steps:
s731: judgment of TPress and pressWhether the temperature is greater than or equal to a second preset temperature T'Press and press；
S732: if yes, go to step S6; if not, go to step S733;
s733: return is made to step S1.
Specifically, in step S71, even when Δ T2>At 2 ℃, the refrigerant sufficiency of all series air-conditioning systems cannot be ensured to be sufficient, the refrigerant sufficiency of partial air-conditioning systems can still be insufficient, and the temperature T of the compressor body can be further combined at the momentPress and pressTo make further scientific decisions. For example, suppose from power-on to TRow boardT when the temperature is raised to 115 ℃ or even slightly higherDishThe drop already exceeds 2 ℃, but with TRow boardFurther heating to, e.g., 120 deg.C, e.g., TPress and pressSuddenly meets the condition that the temperature is greater than or equal to a second preset temperature T'Press and pressAlbeit over the entire course of Δ T1The temperature is always less than 15 ℃, but the refrigerant sufficiency can be directly judged to be insufficient according to the temperature. Wherein the second preset temperature T'Press and pressThe critical judgment value can be manually set in a conservative way or a radical way by an air conditioner manufacturer when the air conditioner leaves a factory and/or by a user when the air conditioner is used according to the risk aversion degrees of different users.
More specifically, T 'may be set'Row board+ΔT'1≤T'Press and press< 140 ℃ C, here taken as T'Press and press115 ℃ +15 ℃ ═ 130 ℃. And firstly, because of the first preset temperature difference value delta T'1The value of (b) represents, after all, an upper limit value in the general case, but in fact, Δ T1Not necessarily equal to or greater than Δ T'1It is possible to eliminate the abnormal operation of the air conditioner caused by other reasons such as the flow path being blocked. In other words, in some extreme cases, even Δ T1＜ΔT'1The degree of refrigerant sufficiency is still somewhat insufficient, e.g. Δ T1May be only slightly less than Δ T'1At this time, the first temperature difference value DeltaT1Although not exhibiting an anomaly, it has resulted in a compressor body temperature TPress and pressThe occurrence of the abnormality can be determined by integrating the elimination function of other judgment conditions, and the abnormality is inevitably caused by the fact that the refrigerant sufficiency degree is also insufficient. For example, when the determination condition is further superimposed with Δ T in step S712>At 2 ℃ i.e. at TDishOn the premise that the improvement degree is ensured to a certain extent, T cannot be caused simply by other reasons such as flow path blockagePress and pressAnomaly up to TPress and pressAt temperatures of 130 ℃ or higher, it is only possible that the degree of refrigerant sufficiency is inevitably insufficient.
Namely: the above-mentioned insufficiency of the sufficiency of the refrigerant, although for TRow boardWhen the temperature is raised to 115 ℃ or higher, the T isDishThere is some guarantee of improvement, but with TRow boardAfter the temperature is continuously raised to above 120 ℃ for example, the situation that the compressor has to be ready for noodle making cannot be guaranteedTemporary reliability risk even at TRow boardIs derived from Δ T during the whole temperature rise process1The judgment of (1) does not send out an abnormal early warning signal all the time, but only needs TPress and pressIf it is abnormal, T can be determinedPress and pressThe abnormality is caused by the fact that the refrigerant is not sufficient. Briefly: after having satisfied T in turnRow board≥115℃、ΔT1＜15℃、ΔT2>On the basis of 2 ℃, further satisfies TPress and press≥T'Press and pressIn this case, the refrigerant is not sufficient. Therefore, the false alarm of the refrigerant missing fault is reduced, and the probability of missing alarm is further reduced, so that the judgment of the refrigerant missing fault by the fixed-frequency air conditioner is more scientific and accurate.
Preferably, T'Row board+ΔT'1≤T'Press and press＜140℃。
Specifically, the refrigerant sufficiency degree is a relative value, when the refrigerant quantity is only slightly missing, the refrigerant sufficiency degree is not enough to generate the operation risk to the air conditioner, and at the moment, the refrigerant missing fault does not need to be judged for the air conditioner, and the compressor does not need to be stopped immediately due to the fact that the refrigerant is only slightly missing. That is, as long as the refrigerant loss degree is controllable, the controllable performance is as follows: as long as the operation of each aspect of the air conditioner does not have large abnormity due to refrigerant loss, the judgment of the refrigerant loss fault does not need to be given to a user. And the second preset temperature T'Press and pressThe following settings are set: t'Row board+ΔT'1≤T'Press and press< 140 ℃, the determination result will be made to reflect more sufficiently when the determination of step S731 is performed: it is inevitable that the compressor will have to be at risk of reliability due to insufficient refrigerant sufficiency. Therefore, on the basis of further reducing the probability of missing report of the refrigerant missing fault, the condition that the refrigerant is only slightly missing is also considered to be excluded, the reasonable control of after-sale maintenance intensity by a user is facilitated, and the after-sale maintenance expense is reduced.
Preferably, step S6 includes the following specific operation steps:
s61: the compressor is stopped, and the stop times X of the compressor are automatically added by 1 progressively;
s62: judging whether X is larger than or equal to N, wherein N is a natural number larger than or equal to 2;
s63: if yes, sequentially executing steps S64-S66; if not, go to step S67;
s64: the compressor keeps a shutdown state, and the air conditioner displays a refrigerant missing fault code;
s65: judging whether the compressor receives a power-off restart instruction or not;
s66: if yes, resetting the compressor by resetting the shutdown time X of the compressor and restarting the compressor, and then returning to the step S1; if not, returning to the step S64;
s67: the compressor is automatically restarted after being stopped for the first preset time period Y, and then the step S1 is returned.
Specifically, the method for judging refrigerant missing faults of the present invention is most important to reduce the false alarm of refrigerant missing faults, and further avoid the missing report on the basis of reducing the false alarm, so that the judgment of the refrigerant missing faults of the fixed frequency air conditioner is more scientific and accurate. No matter whether the false alarm is reduced firstly or the false alarm is reduced, the missing alarm is avoided on the basis of the theory that the refrigerant sufficiency is a relative value, and the theory of the relative value is expressed as follows: the air conditioner is not a very accurate and objective fixed value, and is only used for ensuring that the air conditioner cannot generate a large operation risk due to insufficient refrigerant sufficiency, and further needs to give consideration to the balance between false alarm and missed alarm through some artificial judgment condition settings in the process of controlling the operation risk. However, the operation of the air conditioner is a very complicated process in reality, and although the above-mentioned artificial setting has universality and is supported by a theoretical basis, the false alarm caused by some unknown factors outside the theory can not be completely eliminated in reality.
Therefore, through the setting of steps S61-S67, the air conditioner will display the refrigerant missing fault code only when the compressor is stopped for the nth time continuously due to the refrigerant missing, so that the judgment of the refrigerant missing fault by the fixed-frequency air conditioner will further eliminate the influence of some accidental factors of the air conditioner in the actual operation process, and further improve the scientificity and accuracy of the judgment result. Herein, N, Y can be set to 3 times and 4 minutes, respectively.
Preferably, the compressor body temperature T in step S1Press and pressBy providing a pick-up point in close proximity to the compressor internal winding coil.
Specifically, the position of the internal winding coil of the compressor is different according to different models, and usually the internal winding coil is disposed at one of A, B, C shown in fig. 2, which corresponds to the top, middle and bottom of the compressor respectively. The invention arranges the collecting point at the position close to the winding coil in the compressor, namely the T collected by the collecting point of the compressor regardless of the specific model of the compressorPress and pressThe value can reflect the highest temperature of the compressor body most, further reflect the influence of the refrigerant sufficiency on the energy distribution in the working process of the compressor most visually, and control the reliability risk of the compressor visually and accurately, so that the judgment result is more scientific and accurate.
Preferably, the compressor discharge temperature T in step S1Row boardBy providing a pick-up point on the discharge pipe at a location more than 150mm from the compressor discharge.
In particular, TRow boardThe collection point setting on the blast pipe, but on other spare parts near the blast pipe, apart from the compressor gas vent simultaneously and surpass 150mm, can avoid under special condition, the refrigerant does not flow when for example the compressor stalls, exhaust temperature itself is not high, nevertheless influences exhaust temperature collection because of the heat of compressor body passes through the copper pipe heat-conduction. Thereby increasing TRow boardThe real reliability on the collection is further favorable for more scientificalness and accuracy of the judgment result.
Example 2
The present invention also provides a refrigerant deficiency fault determination apparatus for performing the method as described in embodiment 1, the apparatus including:
a detection module for detecting the temperature T of the compressor body in real time or at regular timePress and pressCompressor discharge temperature TRow boardIndoor heat exchanger coilTemperature TDish；
A judging module: the judging module is used for judging the T detected by the detecting moduleRow boardValue, TRow boardValue, at the first judgment period, judging TRow boardWhether the temperature is greater than or equal to a first preset temperature T'Row boardCalculating and judging T in the second judging periodPress and press、TRow boardA first temperature difference value delta T between1＝TPress and press-TRow boardWhether the temperature difference value is greater than or equal to a first preset temperature difference value delta T'1；
An execution module: the execution module is used for executing a command of stopping the compressor and displaying a refrigerant missing fault code by the air conditioner;
a control module: the control module is used for controlling the judging module to enter the second judging period when the judging result of the first judging period is yes; the control module is further configured to initiate instruction call to the execution module when the determination result of the second determination period is yes.
The present invention also provides a fixed frequency air conditioner comprising a computer readable storage medium storing a computer program and a processor, wherein the computer program, when read and executed by the processor, implements the method as described in embodiment 1.
The invention also provides a computer-readable storage medium, which stores a computer program that, when read and executed by a processor, implements the method as described in embodiment 1.
Specifically, it can be understood by those skilled in the art that the refrigerant loss fault determination device, the fixed-frequency air conditioner, and the computer-readable storage medium provided in embodiment 2 may all implement the method described in embodiment 1 in a manner of combining software and hardware, and the information interaction, the execution process, and the like of any one of the refrigerant loss fault determination device, the fixed-frequency air conditioner, and the computer-readable storage medium may be referred to the description of the refrigerant loss fault determination method in embodiment 1, and are not described in detail herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A refrigerant missing fault judgment method is used for a fixed-frequency air conditioner and is characterized by comprising the following steps:
s1: real-time or timed detection of compressor body temperature TPress and pressCompressor discharge temperature TRow boardIndoor heat exchanger coil temperature TDish；
S2: judgment of TRow boardWhether the temperature is greater than or equal to a first preset temperature T'Row board；
S3: if yes, go to step S4; if not, returning to the step S1;
s4: calculating and judging TPress and press、TRow boardA first temperature difference value delta T between1＝TPress and press-TRow boardWhether the temperature difference value is greater than or equal to a first preset temperature difference value delta T'1；
S5: if yes, go to step S6; if not, go to step S7;
s6: the compressor is stopped, and the air conditioner displays a refrigerant missing fault code;
s7: return is made to step S1.
2. The refrigerant absence fault determination method according to claim 1, wherein the step S7 includes the following specific operation steps:
s71: calculating and judging T'Dish、T”DishSecond absolute value of temperature difference Δ T therebetween2＝|T'Dish-T”DishWhether | is less than or equal to second preset temperature difference value delta T'2Of which is T'DishFor step S1 at TRow boardL to T'Row boardThe detected coil temperature, T "DishThe temperature of the coil of the indoor heat exchanger detected when the air conditioner is started in the step S1;
s72: if yes, go to step S6; if not, go to step S73;
s73: return is made to step S1.
3. The refrigerant absence fault determination method according to claim 2, wherein the step S73 includes the following specific operation steps:
s731: judgment of TPress and pressWhether the temperature is greater than or equal to a second preset temperature T'Press and press；
S732: if yes, go to step S6; if not, go to step S733;
s733: return is made to step S1.
4. The refrigerant deficiency fault determination method according to claim 3, wherein T'Row board+ΔT'1≤T'Press and press＜140℃。
5. The refrigerant absence fault determination method according to any one of claims 1 to 4, wherein the step S6 includes the following specific operation steps:
s61: the compressor is stopped, and the stop times X of the compressor are automatically added by 1 progressively;
s62: judging whether X is larger than or equal to N, wherein N is a natural number larger than or equal to 2;
s63: if yes, sequentially executing steps S64-S66; if not, go to step S67;
s64: the compressor keeps a shutdown state, and the air conditioner displays a refrigerant missing fault code;
s65: judging whether the compressor receives a power-off restart instruction or not;
s66: if yes, resetting the compressor by resetting the shutdown time X of the compressor and restarting the compressor, and then returning to the step S1; if not, returning to the step S64;
s67: the compressor is automatically restarted after being stopped for the first preset time period Y, and then the step S1 is returned.
6. The refrigerant deficiency fault determination method according to claim 5, wherein the compressor body temperature T in step S1Press and pressBy providing a pick-up point in close proximity to the compressor internal winding coil.
7. The refrigerant deficiency fault determination method according to claim 5, wherein the compressor discharge temperature T in step S1Row boardBy providing a pick-up point on the discharge pipe at a location more than 150mm from the compressor discharge.
8. A refrigerant absence failure determination apparatus for performing the method according to any one of claims 1 to 7, the apparatus comprising:
a detection module for detecting the temperature T of the compressor body in real time or at regular timePress and pressCompressor discharge temperature TRow boardIndoor heat exchanger coil temperature TDish；
A judging module: the judging module is used for judging the T detected by the detecting moduleRow boardValue, TRow boardValue, at the first judgment period, judging TRow boardWhether the temperature is greater than or equal to a first preset temperature T'Row boardCalculating and judging T in the second judging periodPress and press、TRow boardA first temperature difference value delta T between1＝TPress and press-TRow boardWhether the temperature difference value is greater than or equal to a first preset temperature difference value delta T'1；
An execution module: the execution module is used for executing a command of stopping the compressor and displaying a refrigerant missing fault code by the air conditioner;
a control module: the control module is used for controlling the judging module to enter the second judging period when the judging result of the first judging period is yes; the control module is further configured to initiate instruction call to the execution module when the determination result of the second determination period is yes.
9. A fixed frequency air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-7.
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CN105890116A (en) * 2016-04-27 2016-08-24 芜湖美智空调设备有限公司 Detection method and system for leakage of refrigerant of air conditioner
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