CN111457550B - Air conditioner refrigerant shortage detection method and device and air conditioner - Google Patents
Air conditioner refrigerant shortage detection method and device and air conditioner Download PDFInfo
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- CN111457550B CN111457550B CN202010312202.5A CN202010312202A CN111457550B CN 111457550 B CN111457550 B CN 111457550B CN 202010312202 A CN202010312202 A CN 202010312202A CN 111457550 B CN111457550 B CN 111457550B
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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
- F24F11/62—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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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
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Abstract
The invention relates to the technical field of air conditioners, and particularly provides a method and a device for detecting the lack of refrigerant of an air conditioner and the air conditioner, wherein the method for detecting the lack of refrigerant of the air conditioner comprises the steps of firstly determining whether the middle pipe temperatures of all indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the initial middle pipe temperature measured in advance; the refrigerant is judged for the first time by utilizing the middle pipe temperature of the indoor unit, when the middle pipe temperatures of all the indoor units meet the first preset condition, the refrigerant is further judged by combining the opening degrees of the indoor units, misjudgment caused by falling of temperature sensing bags and the like is avoided, when the opening degrees of all the indoor units meet the second preset condition, the fact that the air conditioner lacks the refrigerant is determined, the scheme is combined with the structural characteristics of the air conditioner, judgment is carried out according to the middle pipe temperature and the opening degrees of the indoor units, the judgment result is prevented from being influenced by one indoor unit, and the detection precision of the lacking the refrigerant is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for detecting lack of refrigerant of an air conditioner and the air conditioner.
Background
The multi-split air conditioner usually causes a refrigerant leakage phenomenon of a system due to long-term standing or long-distance transportation, the refrigerant leakage causes the system to be in a fluorine-deficient state, the air conditioner needs to be supplemented with a refrigerant in time, and if the refrigerant is not supplemented in time, the performance of the air conditioner system is reduced.
The current air conditioning unit still can move under lacking fluorine state (for example the refrigerant is minimum 5% of nominal refrigerant volume), but the unit refrigeration effect is poor this moment, if not in time the shut down, the travelling comfort is poor, influences user experience, and in addition, the air conditioner moves under lacking fluorine condition for a long time and can cause compressor wearing and tearing, can damage the compressor when serious.
The traditional fluorine-deficient starting detection protection method is mainly used for judging according to the refrigerant flow, the temperature difference, the compressor current and power or the comprehensive compressor current, power and temperature difference, flow, current or temperature detection parts are often required to be additionally arranged in the judging methods, the judgment is not combined with the actual structure of a multi-split air conditioner, and the misjudgment is easily caused.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the lack of refrigerant of an air conditioner and the air conditioner, so as to solve the problems that the existing air conditioner cannot accurately detect the state of the refrigerant and the like.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
in a first aspect, an embodiment of the present invention provides an air conditioner refrigerant shortage detection method, where the air conditioner refrigerant shortage detection method is applied to an air conditioner, the air conditioner includes a plurality of indoor units, and the method includes:
acquiring the middle pipe temperature and the opening of an indoor unit valve of each indoor unit in the current period; the middle pipe temperature of the indoor unit refers to the temperature of a pipeline in the middle of an evaporator of the indoor unit;
determining whether the middle pipe temperatures of all the indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the pre-measured initial middle pipe temperature of the indoor unit;
when the middle pipe temperatures of all the indoor units in the current period meet a first preset condition, determining whether the number of continuous periods in which the middle pipe temperatures of all the indoor units meet the first preset condition reaches a first preset value;
when the continuous cycle number of all the indoor unit middle pipe temperatures meeting a first preset condition reaches a first preset value, determining whether all the indoor unit valve openness degrees meet a second preset condition;
and when the opening degrees of all the indoor unit valves of the indoor units meet a second preset condition, determining that the multi-split refrigerant is insufficient.
The invention provides a method for detecting lack of refrigerant of an air conditioner, which comprises the steps of firstly determining whether the middle pipe temperatures of all indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the pre-measured initial middle pipe temperature; the refrigerant is judged for the first time by utilizing the middle pipe temperature of the indoor unit, when the middle pipe temperatures of all the indoor units meet the first preset condition, the refrigerant is further judged by combining the opening degrees of the indoor units, misjudgment caused by falling of temperature sensing bags and the like is avoided, when the opening degrees of all the indoor units meet the second preset condition, the refrigerant lack of the air conditioner is determined, the structural characteristics of the air conditioner are combined, judgment is carried out according to the middle pipe temperatures of all the indoor units and the opening degrees of the indoor units, the detection precision of the refrigerant lack is improved, other components such as a pressure sensor and the like are not needed, and the identification accuracy of the refrigerant lack can be improved.
In an optional embodiment, determining whether the intermediate pipe temperatures of all the indoor units in the current period all satisfy a first preset condition according to the intermediate pipe temperature of the indoor unit and a pre-measured initial intermediate pipe temperature of the indoor unit includes:
determining a temperature difference value of each indoor unit according to the intermediate pipe temperature and the initial intermediate pipe temperature, wherein the temperature difference value is the difference value between the initial intermediate pipe temperature and the intermediate pipe temperature;
and when the temperature difference value of each indoor unit is smaller than the temperature threshold value and continuously reaches a preset time length, determining that the temperatures of the middle pipes of all the indoor units in the current period meet a first preset condition.
In an alternative embodiment, the temperature threshold is 4 ℃ to 6 ℃ and the preset time period is greater than or equal to 5 seconds.
In an alternative embodiment, said first preset value is greater than or equal to 3.
In an optional embodiment, when the number of consecutive cycles in which the temperatures of the middle pipes of all the indoor units satisfy the first preset condition reaches the first preset value, the step of determining whether the opening degrees of the indoor units of all the indoor units satisfy the second preset condition includes:
determining whether the opening ratios of all the indoor unit valves of the indoor units reach preset ratios or not;
and when the indoor unit valve opening ratios of all the indoor units are determined to reach the preset ratio, determining that the indoor unit valve openings of all the indoor units meet a second preset condition.
In an alternative embodiment, said preset proportion is greater than or equal to 80%.
In alternative embodiments, the cycle length is greater than or equal to 10 minutes.
In a second aspect, an embodiment of the present invention provides an air conditioner refrigerant shortage detection apparatus, configured to execute the air conditioner refrigerant shortage detection method according to any one of the foregoing embodiments, where the air conditioner refrigerant shortage detection apparatus includes:
the acquisition module is used for acquiring the middle pipe temperature and the opening of the indoor unit valve of each indoor unit in the current period; the middle pipe temperature of the indoor unit refers to the temperature of a middle pipeline of the indoor evaporator;
the processing module is used for determining whether the middle pipe temperatures of all the indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the initial middle pipe temperature of the indoor unit;
the processing module is further configured to determine whether the number of consecutive cycles in which the middle pipe temperatures of all the indoor units meet a first preset condition reaches a first preset value when the middle pipe temperatures of all the indoor units in the current cycle meet the first preset condition;
the processing module is further used for determining whether the opening degrees of the indoor unit valves of all the indoor units meet a second preset condition or not when the continuous cycle number of all the intermediate pipe temperatures of all the indoor units meeting a first preset condition reaches a first preset value;
the processing module is further used for determining that the multi-split air conditioner refrigerant is insufficient when the opening degrees of all the indoor unit valves of the indoor units meet a second preset condition.
In an optional embodiment, the processing module is configured to determine a temperature difference value of each indoor unit according to the intermediate pipe temperature and the initial intermediate pipe temperature, where the temperature difference value is a difference value between the initial intermediate pipe temperature and the intermediate pipe temperature;
the processing module is used for determining that the temperatures of the middle pipes of all the indoor units in the current period all meet a first preset condition when the temperature difference value of each indoor unit is smaller than a temperature threshold value and continuously reaches a preset time length.
In a third aspect, an embodiment of the present invention provides an air conditioner, where the air conditioner includes a controller, and the controller is configured to execute a computer readable program instruction to implement the steps of the method for detecting refrigerant shortage of an air conditioner according to any one of the foregoing embodiments.
Drawings
Fig. 1 is a functional block diagram of an air conditioner provided in the present invention.
Fig. 2 is a flowchart of a method for detecting refrigerant shortage of an air conditioner according to the present invention.
Fig. 3 is a flowchart of another method for detecting refrigerant shortage of an air conditioner according to the present invention.
Fig. 4 is a flowchart of another method for detecting refrigerant shortage of an air conditioner according to the present invention.
Fig. 5 is a schematic diagram of functional modules of the refrigerant shortage detection device of the air conditioner provided by the invention.
Description of reference numerals:
200-an air conditioner; 210-a controller; 300-air conditioner refrigerant lack detection device; 310-an acquisition module; 320-processing module.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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 apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The multi-split air conditioner usually causes a refrigerant leakage phenomenon of a system due to long-term standing or long-distance transportation, the refrigerant leakage causes the system to be in a fluorine-deficient state, the air conditioner needs to be supplemented with a refrigerant in time, and if the refrigerant is not supplemented in time, the performance of the air conditioner system is reduced.
The current unit still can move under lacking fluorine state (the refrigerant is 5% of nominal refrigerant volume minimum), but the unit refrigeration effect is poor this moment, if not in time the shut down, the travelling comfort is poor, influences user experience, and the air conditioner can cause compressor wearing and tearing when lacking fluorine long-time operation under the condition, damages the compressor when serious.
The traditional fluorine-deficient starting detection protection method is mainly used for judging according to the refrigerant flow, the temperature difference, the compressor current and power or the comprehensive compressor current, power and temperature difference, flow, current or temperature detection parts are often required to be additionally arranged in the judging methods, the judgment is not combined with the actual structure of a multi-split air conditioner, and the misjudgment is easily caused.
Based on the above problems, the embodiment of the present invention provides an air conditioner 200, which is used for adjusting the indoor temperature and simultaneously detecting the self state, detecting the refrigerant lack state in time, and avoiding the fluorine lack operation. Referring to fig. 1, fig. 1 is a functional block diagram of an air conditioner 200 according to an embodiment of the present invention. The air conditioner 200 includes a controller 210, and the controller 210 can execute computer instructions to implement the method for detecting refrigerant shortage of the air conditioner. The device for detecting refrigerant shortage of an air conditioner provided by the invention comprises at least one software functional module which can be stored in the controller 210 in the form of software or firmware, for example, the software functional module can be directly burned in a storage space of the controller 210, and in another embodiment, the software functional module can also be stored in other independent storage media and executed by the controller 210.
The controller 210 may be an integrated circuit chip having signal processing capabilities. The controller 210 may be a general-purpose processor including a Central Processing Unit (CPU), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic devices, discrete Gate or transistor logic devices, and discrete hardware components, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present invention, where the general-purpose processor may be a microprocessor, and the controller 210 provided in this embodiment may also be any conventional processor.
In one possible implementation, the air conditioner 200 includes at least one outdoor unit and a plurality of indoor units, and the outdoor unit and the plurality of indoor units are all connected through pipes to convey refrigerant to different indoor units for heat exchange. In this embodiment, the middle pipe of the indoor evaporator of each indoor unit is provided with a temperature sensor for detecting the middle pipe temperature of the indoor unit, where the middle pipe temperature is the temperature of the middle pipe of the indoor evaporator, and the temperature sensor is electrically connected to the controller 210 for sending the detected middle pipe temperature to the controller 210; each indoor unit is provided with an inner unit valve, the inner unit valve is used for controlling the flow of the refrigerant, and understandably, the larger the opening of the inner unit valve is, the larger the flow of the refrigerant is, and the more obvious the refrigeration effect is; in the present embodiment, the internal valves are electrically connected to the controller 210 for adjusting the opening degree under the control of the controller 210.
It will be appreciated that the configuration shown in fig. 1 is merely illustrative and that the air conditioner may include more or fewer components than shown in fig. 1 or may have a different configuration than shown in fig. 1. The components shown in fig. 1 may be implemented in hardware, software, or a combination thereof.
On the basis of the air conditioner shown in fig. 1, the present invention provides a method for detecting a refrigerant shortage of an air conditioner, please refer to fig. 2, and fig. 2 shows a flow diagram of the method for detecting a refrigerant shortage of an air conditioner provided in this embodiment. The method for detecting the lack of refrigerant of the air conditioner comprises the steps 110 to 150.
Step 110: acquiring the middle pipe temperature and the opening of an indoor unit valve of each indoor unit in the current period; the middle pipe temperature of the indoor unit refers to the temperature of the middle pipeline of the evaporator of the indoor unit.
When the air conditioner stably runs, the middle pipe temperature and the inner valve opening degree of each indoor unit in the current period are obtained, the multi-split air conditioner comprises a plurality of indoor units, the middle pipe temperature of each indoor unit is possibly different from the middle pipe temperatures of other indoor units, and the inner valve opening degree of each indoor unit is possibly different from the inner valve opening degrees of other indoor units. The stable operation means that the air conditioner is operated for a certain time period, for example, 10 minutes, at the time of starting. In one possible implementation manner, the period length for performing the middle pipe temperature detection acquisition may be greater than or equal to 10 minutes, and in this embodiment, the period length may be set to 10 minutes.
Step 120: and determining whether the middle pipe temperatures of all the indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the pre-measured initial middle pipe temperature of the indoor unit.
Determining whether all indoor unit middle pipe temperatures meet a first preset condition in the current period according to the indoor unit middle pipe temperature and a pre-measured indoor unit initial middle pipe temperature, wherein the initial middle pipe temperature is the indoor unit middle pipe temperature at the initial startup, understandably, the initial middle pipe temperature can be regarded as the middle pipe temperature when the air conditioner is not in operation, the refrigerant does not circulate at the moment, determining whether the first preset condition is met according to the middle pipe temperature of the indoor unit and the initial middle pipe temperature, namely, judging whether the refrigerant is lacked in the indoor unit heat exchanger pipeline or not, comparing the indoor unit middle pipe temperature in operation with the indoor unit middle pipe temperature in non-operation, thereby judging the refrigerant condition in the pipeline, understandably, if the refrigerant is sufficient, the indoor unit middle pipe temperature is lower due to the heat exchange effect of the refrigerant, if the refrigerant is insufficient, the indoor unit's middle tube temperature is relatively high but still lower than the initial middle tube temperature, which should be approximately the same if there is no refrigerant at all.
Step 130: when the middle pipe temperatures of all the indoor units in the current period all meet a first preset condition, determining whether the number of the continuous periods in which the middle pipe temperatures of all the indoor units all meet the first preset condition reaches a first preset value.
If the middle pipe temperatures of all the indoor units in the previous period meet the first preset condition, whether the number of the continuous periods meeting the first preset condition reaches a first preset value or not is judged according to the middle pipe temperature data of the indoor units in the historical period. The method is characterized in that the number of continuous periods with insufficient refrigerant in a plurality of continuous periods is judged, understandably, if the temperature of the middle pipe of the indoor unit in only one period meets a first preset condition, the condition that the air conditioner lacks the refrigerant cannot be judged according to the condition, therefore, comprehensive judgment and analysis need to be carried out according to temperature data of the plurality of periods, and if the temperatures of the middle pipes of the indoor units in the plurality of continuous periods meet the first preset condition, the condition that the temperature of the pipeline of the heat exchanger of the indoor unit is always in a relatively high state and the refrigerant probably lacks is indicated.
Step 140: and when the continuous period number of the middle pipes of all the indoor units meeting the first preset condition reaches a first preset value, determining whether the opening degrees of the indoor unit valves of all the indoor units meet a second preset condition.
Since the temperature of the middle pipe of the indoor unit is detected by the temperature sensor, in order to avoid detection errors or faults of the temperature sensor, when it is determined that the air conditioner may lack a refrigerant, factors affecting the air conditioner, such as faults of the temperature sensor, need to be discharged. For example, according to whether the opening degree of the indoor unit valve of the indoor unit meets the second preset condition, the larger the opening degree of the indoor unit valve is, the more refrigerant in the pipeline is indicated, and the smaller the opening degree of the indoor unit valve is, the less refrigerant in the pipeline is indicated. It can be understood that if the temperature of the middle pipe of the indoor unit is high and the opening of the indoor unit valve is small, it cannot be determined that the air conditioner lacks a refrigerant, which may be caused by the fact that the temperature of the middle pipe of the indoor unit is high due to the fact that the opening of the valve is small and the refrigerant in the pipe is small. If the temperature of the pipe in the indoor unit is high and the opening degree of the indoor unit valve is large, the refrigerant shortage can be judged because: under the condition that the opening degree of the inner engine valve is large, if the refrigerant is sufficient, the pipeline of the heat exchanger of the indoor unit is full of the refrigerant, the temperature of the middle pipe of the indoor unit is in a low state, and under the condition that the opening degree of the inner engine valve is large, the temperature of the middle pipe is still high, and the fact that the refrigerant is short can be judged.
Step 150: and when the opening degrees of the indoor machine valves of all the indoor machines meet a second preset condition, determining that the refrigerant of the multi-split air conditioner is insufficient.
When the opening degrees of the valves of the indoor units meet the second preset condition, the shortage of the refrigerant of the air conditioner can be determined.
The invention provides a method for detecting lack of refrigerant of an air conditioner, which comprises the steps of firstly determining whether the middle pipe temperatures of all indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the pre-measured initial middle pipe temperature; the refrigerant is judged for the first time by utilizing the middle pipe temperature of the indoor unit, when the middle pipe temperatures of all the indoor units meet the first preset condition, the refrigerant is further judged by combining the opening degrees of the indoor units, misjudgment caused by falling of temperature sensing bags and the like is avoided, when the opening degrees of all the indoor units meet the second preset condition, the refrigerant lack of the air conditioner is determined, the structural characteristics of the air conditioner are combined, judgment is carried out according to the middle pipe temperatures of all the indoor units and the opening degrees of the indoor units, the detection precision of the refrigerant lack is improved, other components such as a pressure sensor and the like are not needed, and the identification accuracy of the refrigerant lack can be improved.
In a possible implementation manner, when it is determined that the multi-split air-conditioner is insufficient, the air-conditioner may be controlled to stop operating and to issue a warning, for example, display a warning message on a display device of the air-conditioner, or the air-conditioner may be controlled to send a warning message to a corresponding user terminal to warn a user of insufficient refrigerant, where the user terminal may be a remote controller corresponding to the air-conditioner, but is not limited thereto, and may also be a smartphone or a tablet computer login terminal of the user.
In one possible implementation, referring to fig. 3, step 120: the method comprises the following substeps of determining whether the middle pipe temperatures of all indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the pre-measured initial middle pipe temperature of the indoor unit.
Step 120-1: and determining the temperature difference of each indoor unit according to the intermediate pipe temperature and the initial intermediate pipe temperature, wherein the temperature difference is the difference between the initial intermediate pipe temperature and the intermediate pipe temperature.
The air conditioner comprises a plurality of indoor units, a temperature difference value corresponding to each indoor unit is determined according to the intermediate pipe temperature of each indoor unit and the initial intermediate pipe temperature, wherein the initial intermediate pipe temperature is the intermediate pipe temperature detected when the air conditioner is started, the temperature difference value is obtained by subtracting the initial intermediate pipe temperature and the intermediate pipe temperature, the difference value can represent the quantity of refrigerants in the heat exchanger pipeline of the indoor unit, for example, the more refrigerants are, the lower the intermediate pipe temperature is, the larger the temperature difference value is, and the less the refrigerant quantity is, the smaller the temperature difference value is.
Step 120-2: and when the temperature difference value of each indoor unit is smaller than the temperature threshold value and continuously reaches the preset time length, determining that the middle pipe temperatures of all the indoor units in the current period all meet a first preset condition.
If the temperature difference value of the indoor units is smaller than the temperature threshold value, the quantity of the refrigerant in the pipelines of the indoor units can be determined to be less, and if the temperature difference values of all the indoor units are smaller than the temperature threshold value and the duration time reaches the preset duration time, the quantity of the refrigerant in all the indoor units can be determined to be less.
It should be noted that, because the multi-split air conditioner exchanges heat between the refrigerant of the outdoor unit and the refrigerant of the indoor unit through the pipeline, and the refrigerant distribution may be uneven due to the pipeline and other reasons, so that the temperature difference values of some of the indoor units may be smaller than the temperature threshold value due to the uneven refrigerant distribution, in order to ensure accurate determination, in this embodiment, the determination condition is set such that all the temperature difference values of the indoor units are smaller than the temperature threshold value and the duration reaches the preset duration, so that the determination accuracy can be improved, and the erroneous determination can be avoided.
In a possible implementation, the temperature threshold is between 4 ℃ and 6 ℃, and preferably may be set to 5 ℃, the preset duration being greater than or equal to 5 seconds. The first preset value is greater than or equal to 3, and the judgment precision can be improved and the misjudgment can be avoided by reasonably setting the temperature threshold, the preset time and the first preset value.
In a possible implementation manner, in order to avoid misjudgment caused by factors such as temperature sensor failure, the actual structure of the multi-split air conditioner needs to be combined, and whether the refrigerant is lacking is further determined according to the opening degree of the indoor unit valve of the indoor unit. Referring to fig. 4, step 140: when the continuous period number of all the indoor unit middle pipe temperatures meeting the first preset condition reaches the first preset value, the step of determining whether the indoor unit valve openness of all the indoor units meets the second preset condition comprises the following steps:
step 140-1: and determining whether the opening ratios of the indoor unit valves of all the indoor units reach preset ratios.
Whether the refrigerant is lacked or not is judged in an auxiliary mode by utilizing the opening degree of the inner machine valve of the indoor machine, whether the refrigerant is lacked or not cannot be judged if the opening degree of the inner machine valve of the indoor machine is small under the condition that the temperature of a pipe in the indoor machine is high, and whether the refrigerant is insufficient can be determined if the opening degree of the inner machine valve is large, for example, a preset proportion is reached under the condition that the temperature of the pipe in the indoor machine is high. The preset proportion may be greater than or equal to 80%, and when the number of consecutive cycles in which the temperatures of the intermediate pipes of all the indoor units satisfy the first preset condition reaches the first preset value, taking a valve with an opening of 480 as an example, when the openings of the indoor valves of all the indoor units reach 400 or more than 400, it may be determined that the indoor valves of all the indoor units satisfy the second preset condition.
Step 140-2: and when the indoor unit valve opening ratios of all the indoor units reach the preset ratio, determining that the indoor unit valve openings of all the indoor units meet a second preset condition.
It should be noted that all the determination conditions provided in this embodiment are determined that the multi-split air conditioner satisfies the conditions when all the indoor units in the multi-split air conditioner satisfy the corresponding conditions, so that differences such as different temperatures of some indoor units due to the type of the pipeline or environmental factors can be avoided.
In order to execute the corresponding steps in the above embodiments and various possible embodiments, an implementation of the refrigerant shortage detection device for an air conditioner is provided below, please refer to fig. 5, and fig. 5 is a diagram of an air conditioner refrigerant shortage detection device 300 according to a preferred embodiment of the present invention. It should be noted that the basic principle and the technical effects of the air-conditioning refrigerant shortage detection device 300 provided in the present embodiment are substantially the same as those of the air-conditioning refrigerant shortage detection method provided in the above embodiment, and for the sake of brief description, corresponding contents in the above embodiment may be referred to for parts that are not mentioned in the present embodiment.
The air conditioner refrigerant shortage detection device 300 includes: an acquisition module 310 and a processing module 320.
The obtaining module 310 is configured to obtain a middle pipe temperature and an opening of an internal machine valve of each internal machine in a current period; the middle pipe temperature of the indoor unit refers to the temperature of the middle pipeline of the evaporator of the indoor unit.
It is understood that, in a preferred embodiment, the obtaining module 310 can be specifically configured to execute the step 110 in the above-mentioned figures to achieve the corresponding technical effect.
The processing module 320 is configured to determine whether the middle pipe temperatures of all indoor units in the current period all satisfy a first preset condition according to the middle pipe temperature of the indoor unit and a predetermined initial middle pipe temperature of the indoor unit.
It is understood that, in a preferred embodiment, the processing module 320 can be specifically configured to execute the step 120 in the above-mentioned figures to achieve the corresponding technical effect.
The processing module 320 is further configured to determine whether the number of consecutive cycles in which the middle pipe temperatures of all the indoor units in the current cycle meet the first preset condition reaches a first preset value when the middle pipe temperatures of all the indoor units in the current cycle meet the first preset condition.
It is understood that, in a preferred embodiment, the processing module 320 can be specifically configured to execute the step 130 in each of the above figures to achieve the corresponding technical effect.
The processing module 320 is further configured to determine whether the opening degrees of the indoor unit valves of all the indoor units satisfy a second preset condition when the number of consecutive cycles in which the temperatures of the middle pipes of all the indoor units satisfy the first preset condition reaches the first preset value.
It is understood that, in a preferred embodiment, the processing module 320 is further specifically configured to execute the step 140 in each of the above-mentioned figures to achieve the corresponding technical effect.
The processing module 320 is further configured to determine that the refrigerant of the multi-split air conditioner is insufficient when the opening degrees of the indoor units of all the indoor units satisfy a second preset condition.
It is understood that, in a preferred embodiment, the processing module 320 is further specifically configured to execute the step 150 in each of the above figures to achieve the corresponding technical effect.
In a possible implementation manner, the processing module 320 is further configured to determine a temperature difference value of each indoor unit according to the intermediate pipe temperature and the initial intermediate pipe temperature, where the temperature difference value is a difference value between the initial intermediate pipe temperature and the intermediate pipe temperature, and when the temperature difference value of each indoor unit is smaller than a temperature threshold and continuously reaches a preset time length, it is determined that the intermediate pipe temperatures of all indoor units in the current period all satisfy a first preset condition.
It is understood that, in a preferred embodiment, the processing module 320 may be further specifically configured to perform steps 120-1 to 120-2 in the above-mentioned figures to achieve the corresponding technical effects.
In a possible implementation manner, the processing module 320 is further configured to determine whether the opening ratios of the indoor units of all the indoor units reach the preset ratio when the number of consecutive cycles in which the temperatures of the middle pipes of all the indoor units meet the first preset condition reaches the first preset value. The processing module 320 is configured to determine that the opening degrees of the indoor units meet a second preset condition when it is determined that the opening degrees of the indoor units of all the indoor units reach a preset ratio.
It is understood that, in a preferred embodiment, the processing module 320 may be further specifically configured to perform steps 140-1 to 140-2 in the above-mentioned figures to achieve the corresponding technical effects.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
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 (8)
1. The method for detecting the refrigerant shortage of the air conditioner is characterized by being applied to the air conditioner (200) in a refrigeration mode, wherein the air conditioner (200) comprises a plurality of indoor units, and the method comprises the following steps:
acquiring the middle pipe temperature and the opening of an indoor unit valve of each indoor unit in the current period; the middle pipe temperature of the indoor unit refers to the temperature of a pipeline in the middle of an evaporator of the indoor unit;
determining whether the middle pipe temperatures of all the indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the pre-measured initial middle pipe temperature of the indoor unit;
when the middle pipe temperatures of all the indoor units in the current period meet a first preset condition, determining whether the number of continuous periods in which the middle pipe temperatures of all the indoor units meet the first preset condition reaches a first preset value;
when the continuous cycle number of all the indoor unit middle pipe temperatures meeting a first preset condition reaches a first preset value, determining whether all the indoor unit valve openness degrees meet a second preset condition;
when the opening degrees of the indoor unit valves of all the indoor units meet a second preset condition, determining that the refrigerant of the multi-split air conditioner is insufficient;
determining whether the intermediate pipe temperatures of all the indoor units in the current period meet a first preset condition according to the intermediate pipe temperature of the indoor unit and the pre-measured initial intermediate pipe temperature of the indoor unit comprises the following steps:
determining a temperature difference value of each indoor unit according to the intermediate pipe temperature and the initial intermediate pipe temperature, wherein the temperature difference value is the difference value between the initial intermediate pipe temperature and the intermediate pipe temperature; when the temperature difference value of each indoor unit is smaller than a temperature threshold value and continuously reaches a preset time length, determining that the temperatures of middle pipes of all the indoor units in the current period meet a first preset condition;
when the continuous cycle number of all the indoor unit middle pipe temperatures meeting the first preset condition reaches the first preset value, the step of determining whether all the indoor unit valve openness degrees meet the second preset condition comprises the following steps:
determining whether the opening ratios of all the indoor unit valves of the indoor units reach preset ratios or not; and when the indoor unit valve opening ratios of all the indoor units are determined to reach the preset ratio, determining that the indoor unit valve openings of all the indoor units meet a second preset condition.
2. The refrigerant shortage detection method of an air conditioner according to claim 1, wherein the temperature threshold is 4 ℃ to 6 ℃, and the preset time period is greater than or equal to 5 seconds.
3. The refrigerant shortage detection method of claim 1, wherein the first preset value is greater than or equal to 3.
4. The refrigerant shortage detection method of claim 1, wherein the predetermined ratio is greater than or equal to 80%.
5. The method as claimed in claim 1, wherein the period is longer than or equal to 10 minutes.
6. An air conditioner refrigerant shortage detection device, wherein the air conditioner refrigerant shortage detection device (300) is configured to perform the air conditioner refrigerant shortage detection method according to any one of claims 1 to 5, and the air conditioner refrigerant shortage detection device (300) includes:
the acquisition module (310) is used for acquiring the middle pipe temperature and the opening of each indoor unit valve in the current period; the middle pipe temperature of the indoor unit refers to the temperature of a pipeline in the middle of an evaporator of the indoor unit;
the processing module (320) is used for determining whether the middle pipe temperatures of all the indoor units in the current period meet a first preset condition according to the middle pipe temperature of the indoor unit and the initial middle pipe temperature of the indoor unit;
the processing module (320) is further configured to determine whether the number of consecutive cycles in which the middle pipe temperatures of all the indoor units in the current cycle meet a first preset condition reaches a first preset value when the middle pipe temperatures of all the indoor units in the current cycle meet the first preset condition;
the processing module (320) is further configured to determine whether the opening degrees of the indoor unit valves of all the indoor units meet a second preset condition when the number of consecutive cycles in which the temperatures of the middle pipes of all the indoor units meet the first preset condition reaches a first preset value;
the processing module (320) is further configured to determine that the multi-split refrigerant is insufficient when the opening degrees of the indoor unit valves of all the indoor units meet a second preset condition.
7. The refrigerant shortage detection device of claim 6, wherein the processing module (320) is configured to determine a temperature difference of each indoor unit according to the intermediate pipe temperature and the initial intermediate pipe temperature, where the temperature difference is a difference between the initial intermediate pipe temperature and the intermediate pipe temperature;
the processing module (320) is configured to determine that the temperatures of the middle pipes of all the indoor units in the current period all meet a first preset condition when the temperature difference value of each indoor unit is smaller than the temperature threshold and continuously reaches a preset duration.
8. An air conditioner, characterized in that the air conditioner (200) comprises a controller (210), and the controller (210) is configured to execute computer-readable program instructions to implement the steps of the air conditioner refrigerant shortage detection method according to any one of claims 1 to 5.
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| CN115077062B (en) * | 2022-06-10 | 2023-09-08 | 宁波奥克斯电气股份有限公司 | Fluorine-deficiency prompting control method and device for multi-connected air conditioner and air conditioner |
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| JP2017053566A (en) * | 2015-09-10 | 2017-03-16 | ジョンソンコントロールズ ヒタチ エア コンディショニング テクノロジー（ホンコン）リミテッド | Refrigeration cycle device |
| CN105928156B (en) * | 2016-05-12 | 2018-08-07 | 广东美的制冷设备有限公司 | Coolant leakage detection method, coolant leakage detection device and air conditioner |
| CN106595152B (en) * | 2016-10-25 | 2018-12-28 | 珠海格力电器股份有限公司 | A kind of the determination method, apparatus and air-conditioning of air conditioner coolant abnormal circulation |
| CN109869868B (en) * | 2018-12-29 | 2020-04-07 | 珠海格力电器股份有限公司 | Air conditioner multi-split air conditioner refrigerant shortage detection method and device and air conditioner |
| CN110567095B (en) * | 2019-08-22 | 2021-04-16 | 宁波奥克斯电气股份有限公司 | Method for detecting and controlling abnormity of electronic expansion valve of multi-connected indoor unit |
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Effective date of registration: 20221010 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315000 No.1166 Mingguang North Road, Jiangshan Town, Yinzhou District, Ningbo City, Zhejiang Province Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |