CN113531773A - Multi-connected air conditioner fault detection method and device and multi-connected air conditioner - Google Patents
Multi-connected air conditioner fault detection method and device and multi-connected air conditioner Download PDFInfo
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- CN113531773A CN113531773A CN202110680255.7A CN202110680255A CN113531773A CN 113531773 A CN113531773 A CN 113531773A CN 202110680255 A CN202110680255 A CN 202110680255A CN 113531773 A CN113531773 A CN 113531773A
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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
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—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
- 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
- F24F2110/00—Control inputs relating to air properties
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Abstract
The invention discloses a multi-connected air conditioner fault detection method and device and a multi-connected air conditioner, and relates to the technical field of air conditioners, wherein the multi-connected air conditioner fault detection method comprises the following steps: when the multi-connected air conditioner is started, monitoring the indoor environment temperature and monitoring the coil temperature of the first indoor unit; the first indoor unit is an indoor unit in a starting state; when the first indoor unit runs for a first preset time length, whether a target indoor unit with heat exchange failure exists in the first indoor unit is judged based on the indoor environment temperature and the coil temperature; if so, carrying out fault verification on the target indoor unit, and confirming that the target indoor unit has a fault when the fault verification passes. The method can accurately detect the indoor unit with the fault, and improves the accuracy of the fault detection of the multi-connected air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a multi-connected air conditioner fault detection method and device and a multi-connected air conditioner.
Background
The multi-connected air conditioner comprises a plurality of indoor units, wherein a plurality of indoor units are usually started to be used at the same time in the operation process of the multi-connected air conditioner, if any indoor unit pipeline has a fault, such as a pipeline blockage fault, because other indoor units are in a normal operation state, the influence of pipeline blockage on an outdoor compressor is not obvious, the protection cannot be caused, and the indoor unit with the fault cannot be identified in time.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for detecting faults of a multi-connected air conditioner and the multi-connected air conditioner, which can accurately detect an indoor unit with faults and improve the accuracy of fault detection of the multi-connected air conditioner.
According to an embodiment of the present invention, in one aspect, a method for detecting a fault of a multi-connected air conditioner is provided, including: when the multi-connected air conditioner is started, monitoring the indoor environment temperature and monitoring the coil temperature of the first indoor unit; the first indoor unit is an indoor unit in a starting state; when the first indoor unit runs for a first preset time length, judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the indoor environment temperature and the coil pipe temperature; if so, carrying out fault verification on the target indoor unit, and confirming that the target indoor unit has a fault when the fault verification passes.
By adopting the technical scheme, whether the target indoor unit with poor heat exchange efficiency effect exists is judged according to the indoor environment temperature and the coil pipe temperature of the indoor unit in each running state, further fault verification is carried out on the target indoor unit with poor heat exchange effect, the indoor unit with faults can be accurately detected, and the accuracy of fault detection of the multi-connected air conditioner is improved.
Preferably, the step of determining whether a target indoor unit with heat exchange failure exists in the first indoor unit based on the indoor environment temperature and the coil temperature includes: acquiring a first indoor environment temperature and a first coil pipe temperature corresponding to the first indoor unit before each expansion valve is opened; when the first indoor unit operates for a first preset time length, acquiring a current second indoor environment temperature and a second coil temperature of the first indoor unit every second preset time length, calculating a first temperature difference value between the first indoor environment temperature and the second indoor environment temperature, and calculating a second temperature difference value between the first coil temperature and the second coil temperature; and judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the first temperature difference value and the second temperature difference value.
By adopting the technical scheme, the first temperature difference value and the second temperature difference value corresponding to the indoor units in the starting states are obtained, and the heat exchange capacity of the indoor units in the starting states can be accurately judged, so that target indoor units with heat exchange faults can be rapidly screened out from the running indoor units, and the fault detection efficiency is improved.
Preferably, the step of determining whether a target indoor unit with failed heat exchange exists in the first indoor unit based on the first temperature difference and the second temperature difference includes: and taking the indoor unit meeting the condition that the first temperature difference is smaller than a first preset threshold value and the second temperature difference is smaller than a second preset threshold value in the first indoor unit as a target indoor unit, and determining that the target indoor unit fails in heat exchange.
By adopting the technical scheme, the indoor unit with the variable quantity of the indoor environment temperature being smaller than the first preset threshold value before and after starting up and the variable quantity of the coil temperature being smaller than the second preset threshold value is taken as the target indoor unit with heat exchange failure, so that the accuracy of fault detection is improved.
Preferably, the step of performing fault verification on the target indoor unit includes: when the heat exchange failure of the target indoor unit is determined, adding 1 to the counting result of a target counter corresponding to the target indoor unit; wherein the initial value of the target counter is 0; and when the counting result of the target counter is greater than or equal to the preset times and the target indoor unit is not recorded as fault error report, controlling the multi-connected air conditioner to carry out fault verification on the target indoor unit.
By adopting the technical scheme, the frequency of heat exchange failure of the target indoor unit is counted, and when the frequency of heat exchange failure of the target indoor unit is large, the target indoor unit is subjected to fault verification, so that the fault of the indoor unit is prevented from being detected by mistake, and the reliability of the fault detection of the multi-connected air conditioner is improved.
Preferably, the step of controlling the multi-connected air conditioner to perform fault verification on the target indoor unit includes: when a second indoor unit is stopped when reaching a temperature, or the difference value between the indoor environment temperature corresponding to the second indoor unit and the set temperature is smaller than a third preset threshold value, controlling a second expansion valve corresponding to the second indoor unit to be closed, and controlling a target expansion valve corresponding to the target indoor unit to be opened to the maximum opening degree; the second indoor units comprise all the indoor units except the target indoor unit in the first indoor unit; and when the target expansion valve runs for a third preset time length at the maximum opening, judging whether the target indoor unit has a heat exchange fault or not based on the indoor environment temperature and the coil temperature, and if so, verifying that the target indoor unit has the heat exchange fault.
By adopting the technical scheme, when the second indoor unit is stopped at a warm state or the indoor environment temperature is close to the set temperature, the electronic expansion valve corresponding to the second indoor unit is controlled to be closed, the influence on the normal work of the multi-connected air conditioner is avoided, the target indoor unit is controlled to operate independently, whether the target indoor unit has a heat exchange fault or not can be accurately detected, and the fault false detection rate is reduced.
Preferably, the step of determining whether the target indoor unit has a heat exchange fault based on the indoor environment temperature and the coil temperature includes: acquiring the current third indoor environment temperature and the current third coil temperature corresponding to the target indoor unit; calculating a third temperature difference value between the third indoor environment temperature and the first indoor environment temperature, and calculating a fourth temperature difference value between the third coil temperature and the first coil temperature; and when the third temperature difference value is smaller than a first preset threshold value and the fourth temperature difference value is smaller than a second preset threshold value, determining that the target indoor unit has a heat exchange fault.
By adopting the technical scheme, when the target indoor unit operates independently, whether the target indoor unit has the heat exchange fault or not is judged again based on the indoor environment temperature change value and the coil pipe temperature change value, whether the target indoor unit has the heat exchange fault or not can be accurately identified, and the fault detection accuracy is improved.
Preferably, the method for detecting the fault of the multi-connected air conditioner further comprises: when the target indoor unit has no heat exchange fault, recording the target indoor unit as a fault false alarm; or when the target indoor unit has a heat exchange fault, controlling the compressor to report a low-voltage protection fault, and when receiving an instruction of completing the overhaul of the target indoor unit, controlling the target counter to be reset.
By adopting the technical scheme, when the target indoor unit is determined to have no heat exchange fault, the fault misinformation is recorded, so that redundant fault verification is avoided for the target indoor unit, and the fault detection efficiency is improved; the compressor reports the low-voltage protection fault, so that the maintainer can timely maintain the target indoor unit, and the running stability of the multi-connected air conditioner is improved.
According to an embodiment of the present invention, in another aspect, there is provided a multi-connected air conditioner fault detection apparatus, including: the monitoring module is used for monitoring the indoor environment temperature and monitoring the coil temperature of the first indoor unit when the multi-connected air conditioner is started; the first indoor unit is an indoor unit in a starting state; the judging module is used for judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the indoor environment temperature and the coil pipe temperature when the first indoor unit runs for a first preset time length; and the verification module is used for performing fault verification on the target indoor unit when the target indoor unit with failed heat exchange exists in the first indoor unit, and confirming that the target indoor unit has a fault when the fault verification is passed.
According to an embodiment of the present invention, in another aspect, a multi-connected air conditioner is provided, which includes a processor and a computer readable storage medium storing a computer program, and when the computer program is read by the processor and executed by the processor, the method of any one of the first aspect is implemented.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: in the operation process of the multi-connected air conditioner, whether a target indoor unit with poor heat exchange efficiency exists is judged according to the indoor environment temperature and the coil pipe temperature of the indoor unit in each operation state, further fault verification is carried out on the target indoor unit with poor heat exchange effect, the indoor unit with faults can be accurately detected, and the accuracy of fault detection of the multi-connected air conditioner is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flow chart of a method for detecting faults of a multi-connected air conditioner according to the present invention;
fig. 2 is a flow chart for judging the pipeline blockage of the multi-online indoor unit provided by the invention;
fig. 3 is a schematic structural diagram of a multi-connected air conditioner fault detection device provided by the invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment provides a multi-connected air conditioner fault detection method, which may be applied to a multi-connected air conditioner, referring to a flow chart of the multi-connected air conditioner fault detection method shown in fig. 1, and the method mainly includes the following steps S102 to S106:
step S102: when the multi-connected air conditioner is started, the indoor environment temperature is monitored, and the coil pipe temperature of the first indoor unit is monitored.
The first indoor unit is an indoor unit in a starting state. When the multi-connected air conditioner is started to operate, the indoor environment temperature corresponding to each indoor unit in the starting state is detected in real time based on the first temperature sensor, and the coil temperature corresponding to each indoor unit in the starting state is detected in real time based on the second temperature sensor.
Step S104: when the first indoor unit runs for a first preset time length, whether a target indoor unit with heat exchange failure exists in the first indoor unit is judged based on the indoor environment temperature and the coil pipe temperature.
The first preset time period may be a time period during which the multi-connected air conditioner can enter a stable cooling or heating operation state, and the value range of the first preset time period may be 15-30 min.
When the operation duration of the first indoor unit in the starting state reaches a first preset duration, periodically judging whether each indoor unit in the operation state has a heat exchange failure condition or not according to the monitored indoor environment temperature and the monitored coil temperature, namely the heat exchange effect is poor, and taking the indoor unit with the heat exchange failure fault in the first indoor unit in the operation state as a target indoor unit.
Step S106: if so, carrying out fault verification on the target indoor unit, and confirming that the target indoor unit has a fault when the fault verification passes.
When a target indoor unit with heat exchange failure exists in the first indoor unit in the starting state, in order to avoid a judgment error, fault verification is performed on the target indoor unit again based on the monitored indoor environment temperature and the monitored coil pipe temperature, and when the fault verification of the target indoor unit passes, a fault with poor heat exchange effect exists in the target indoor unit, and a pipeline blockage fault possibly exists in the target indoor unit.
According to the method for detecting the multi-connected air conditioner fault, in the operation process of the multi-connected air conditioner, whether the target indoor unit with poor heat exchange efficiency exists or not is judged according to the indoor environment temperature and the coil pipe temperature of the indoor unit in each operation state, the target indoor unit with poor heat exchange effect is subjected to further fault verification, the indoor unit with the fault can be accurately detected, and the accuracy of the multi-connected air conditioner fault detection is improved.
In order to accurately screen out a target indoor unit with heat exchange failure, the embodiment provides an implementation manner for determining whether a target indoor unit with heat exchange failure exists in a first indoor unit based on an indoor environment temperature and a coil temperature, and the implementation manner can be specifically executed by referring to the following steps (1) to (3):
step (1): and acquiring a first indoor environment temperature and a first coil pipe temperature corresponding to the first indoor unit before each expansion valve is opened.
Before the expansion valve of the first indoor unit in each starting state is opened, the detected indoor environment temperature corresponding to the indoor unit in each starting state is obtained and recorded as a first indoor environment temperature, and the detected coil temperature corresponding to the indoor unit in each starting state is obtained and recorded as a first coil temperature.
Step (2): when the first indoor unit operates for a first preset time length, the current second indoor environment temperature and the second coil temperature of the first indoor unit are obtained every second preset time length, a first temperature difference value between the first indoor environment temperature and the second indoor environment temperature is calculated, and a second temperature difference value between the first coil temperature and the second coil temperature is calculated.
The second preset time period may be a time period in which the indoor environment temperature or the coil temperature changes, and the value range of the second preset time period may be 15-30 min. The first temperature difference is an absolute value of a difference between a first indoor ambient temperature and a second indoor ambient temperature, and the second temperature difference is an absolute value of a difference between a first coil temperature and a second coil temperature.
When the indoor units are started to operate for a first preset time length, the current indoor environment temperature or the air outlet temperature corresponding to the indoor units in the starting states is periodically obtained and recorded as a second indoor environment temperature, and the current coil pipe temperature corresponding to the indoor units in the starting states is periodically obtained and recorded as a second coil pipe temperature.
And calculating the difference value between the second indoor environment temperature of each indoor unit in the starting state and the corresponding first indoor environment temperature according to the second indoor environment temperature acquired in each period to obtain the corresponding first temperature difference value of each indoor unit in the starting state, namely detecting the change values of the indoor environment temperatures of the indoor units in the starting states before starting and after starting for a period of time.
And calculating the difference value between the second coil temperature of each indoor unit in the startup state and the corresponding first coil temperature according to the obtained second coil temperature in each period to obtain a second temperature difference value corresponding to each indoor unit in the startup state, namely detecting the change values of the coil temperatures of each indoor unit in the startup state before startup and after a period of startup operation.
And (3): and judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the first temperature difference value and the second temperature difference value.
Because the change value of the indoor environment temperature and the change value of the coil temperature corresponding to each indoor unit can reflect the heat exchange capacity, whether the indoor unit in each starting state has the condition of heat exchange failure or poor heat exchange capacity can be accurately judged according to the first temperature difference and the second temperature difference, and the indoor unit with the heat exchange failure or poor heat exchange capacity is taken as the target indoor unit.
By acquiring the first temperature difference value and the second temperature difference value corresponding to the indoor units in the starting states, the heat exchange capacity of the indoor units in the starting states can be accurately judged, so that target indoor units with heat exchange faults can be quickly screened out from the running indoor units, and the fault detection efficiency is improved.
In a possible implementation manner, the indoor unit, which satisfies that the first temperature difference is smaller than the first preset threshold and the second temperature difference is smaller than the second preset threshold, in the first indoor unit is taken as a target indoor unit, and it is determined that the target indoor unit fails in heat exchange.
And judging whether an indoor unit exists in the first indoor unit or not, and if so, recording the indoor unit as a target indoor unit, and determining that the target indoor unit is the indoor unit with heat exchange failure fault, wherein the first temperature difference is smaller than a first preset threshold value, and the second temperature difference is smaller than a second preset threshold value. The value range of the first preset threshold value can be 1-4 ℃, the value range of the second preset threshold value can be 2-5 ℃, and when the variation of the indoor environment temperature before and after the indoor unit is started is small and the variation of the coil temperature is small, the indoor environment temperature is not effectively reduced or improved after the indoor unit runs for a period of time, and the weak heat exchange capability of the indoor unit is determined.
The indoor unit with the variable quantity of the indoor environment temperature before and after starting up being smaller than the first preset threshold value and the variable quantity of the coil temperature being smaller than the second preset threshold value is taken as the target indoor unit with heat exchange failure, so that the accuracy of fault detection is improved.
In order to verify whether the target indoor unit has a fault, the present embodiment provides an implementation manner of performing fault verification on the target indoor unit, and the following steps 1) to 2) may be specifically referred to:
step 1): and when the heat exchange failure of the target indoor unit is determined, adding 1 to the counting result of the target counter corresponding to the target indoor unit.
The initial value of the target counter is 0. And when the heat exchange failure of the target indoor unit is preliminarily judged based on the judgment mode, counting the heat exchange failure times of the same target indoor unit based on the target counter.
Step 2): and when the counting result of the target counter is more than or equal to the preset times and the target indoor unit is not recorded as fault error report, controlling the multi-connected air conditioner to carry out fault verification on the target indoor unit.
In order to avoid false detection of the fault of the indoor unit, the preset times can be 2-5 times, and a preferred value is 3 times, that is, when the number of times of heat exchange failure of the target indoor unit is judged to be more than or equal to 3 times based on the first temperature difference value and the second temperature difference value, and the target indoor unit is not recorded as an indoor unit with a fault and a false alarm at present, the multi-connected air conditioner is controlled to perform fault verification on the target indoor unit.
By counting the times of heat exchange failure of the target indoor unit and carrying out fault verification on the target indoor unit when the times of heat exchange failure of the target indoor unit are more, the fault of the indoor unit is prevented from being detected by mistake, and the reliability of fault detection of the multi-connected air conditioner is improved.
In order to further improve the accuracy of detecting the fault of the multi-connected air conditioner, the embodiment provides an implementation method for controlling the multi-connected air conditioner to perform fault verification on a target indoor unit, and the implementation method can be specifically executed with reference to the following steps 1 to 2:
step 1: and when the second indoor unit is stopped when reaching the temperature, or the difference value between the indoor environment temperature corresponding to the second indoor unit and the set temperature is smaller than a third preset threshold value, controlling a second expansion valve corresponding to the second indoor unit to be closed, and controlling a target expansion valve corresponding to the target indoor unit to be opened to the maximum opening degree.
The second indoor units comprise all the indoor units except the target indoor unit in the first indoor unit, namely all the other indoor units except the target indoor unit with heat exchange failure in the first indoor unit in the starting state are marked as the second indoor units.
When the second indoor unit without heat exchange failure is in a temperature-reaching shutdown state, or when the difference between the indoor ambient temperature of the second indoor unit and the set temperature is smaller than a third preset threshold (the value range can be 0-3 ℃), namely when the indoor ambient temperature corresponding to the second indoor unit is close to the set temperature, the electronic expansion valves of the second indoor units without heat exchange failure are marked as second expansion valves, the second expansion valves are controlled to be closed, and the target expansion valves corresponding to the target indoor units are independently opened to the maximum opening degree, so that the target indoor units can independently operate.
Step 2: and when the target expansion valve runs for a third preset time length at the maximum opening, judging whether the target indoor unit has a heat exchange fault or not based on the indoor environment temperature and the coil temperature, and if so, verifying that the target indoor unit has the heat exchange fault.
And controlling a target expansion valve corresponding to the target indoor unit to operate at the maximum opening degree for a third preset time period so as to change the indoor environment temperature and the coil pipe temperature corresponding to the target indoor unit, wherein the value range of the third preset time period can be 25-50 min.
When the second indoor unit is stopped at a warm state or the indoor environment temperature is close to the set temperature, the electronic expansion valve corresponding to the second indoor unit is controlled to be closed, so that the influence on the normal work of the multi-connected air conditioner is avoided, the target indoor unit is controlled to operate independently, whether the target indoor unit has a heat exchange fault or not can be accurately detected, and the fault false detection rate is reduced.
In a feasible implementation manner, the current third indoor environment temperature and the current third coil temperature corresponding to the target indoor unit are obtained; calculating a third temperature difference value between the third indoor environment temperature and the first indoor environment temperature, and calculating a fourth temperature difference value between the third coil temperature and the first coil temperature; and when the third temperature difference value is smaller than the first preset threshold value and the fourth temperature difference value is smaller than the second preset threshold value, determining that the target indoor unit has a heat exchange fault.
When the target indoor unit operates alone for a third preset time length, the current indoor environment temperature (namely the indoor environment temperature of the environment where the target indoor unit is located) and the coil temperature corresponding to the target indoor unit are obtained and recorded as the third indoor environment temperature and the third coil temperature, the absolute value of the difference value between the third indoor environment temperature and the first indoor environment temperature is calculated, a third temperature difference value is obtained, the absolute value of the difference value between the third coil temperature and the first coil temperature is calculated, and a fourth temperature difference value is obtained.
When the third temperature difference value is smaller than the first preset threshold value and the fourth temperature difference value is smaller than the second preset threshold value, the target indoor unit is still in a heat exchange failure state, a heat exchange fault of the target indoor unit is determined, and the problem that the target indoor unit is possibly blocked by a pipeline due to the fact that the target indoor unit has the heat exchange fault is verified. Whether the target indoor unit has the heat exchange fault or not is judged again based on the indoor environment temperature change value and the coil pipe temperature change value when the target indoor unit operates independently, whether the target indoor unit has the heat exchange fault or not can be accurately identified, and the fault detection accuracy is improved.
In a possible implementation manner, the method for detecting the fault of the multi-connected air conditioner further includes: and when the target indoor unit has no heat exchange fault, recording the fault error report of the target indoor unit. In the process of fault verification of the target indoor unit, when the third temperature difference is not satisfied and is smaller than the first preset threshold and the fourth temperature difference is smaller than the second preset threshold, it is determined that the target indoor unit has no heat exchange fault, the compressor is not required to be controlled to report the fault, the operating temperature condition is judged to be close to the limit, the false alarm is caused, and the target indoor unit is recorded as fault false alarm.
In a possible implementation manner, the method for detecting the fault of the multi-connected air conditioner further includes: and when the target indoor unit has a heat exchange fault, controlling the compressor to report a low-voltage protection fault, and when receiving an instruction of completing the overhaul of the target indoor unit, controlling the target counter to be reset.
When the heat exchange fault of the target indoor unit is determined, the compressor is controlled to send out a fault alarm to prompt a maintainer to timely overhaul the target indoor unit, when the maintainer finishes overhauling the target indoor unit, an instruction of finishing overhauling the target indoor unit is input into the multi-connected air conditioner, when the instruction of finishing overhauling the target indoor unit input by a user is received, a target counter corresponding to the target indoor unit is controlled to be reset, and the number of times of heat exchange failure of the target indoor unit to be counted is reset.
According to the method for detecting the faults of the multi-connected air conditioner, after the multi-connected air conditioner is started to operate for a period of time, the heat exchange capacity of the indoor unit is judged according to the indoor environment temperature before and after the multi-connected air conditioner is started and the temperature change condition of the coil pipe, the indoor unit with weak heat exchange capacity can be screened out, the faults of the indoor unit of the multi-connected air conditioner can be accurately identified through single fault verification of the indoor unit with weak heat exchange capacity, and the faults of the multi-connected air conditioner can be identified in advance under the condition that the air conditioning unit is not obviously abnormal.
Corresponding to the method for detecting the multi-connected air conditioner fault provided in the above embodiment, an embodiment of the present invention provides an example of performing blockage judgment on a multi-connected indoor unit pipeline by using the above method for detecting the multi-connected air conditioner fault, referring to a flow chart of judging blockage of the multi-connected indoor unit pipeline shown in fig. 2, and specifically referring to the following steps S201 to S206:
step S201: when the multi-connected air conditioner is started, the indoor ambient temperature Ta0 and the coil temperature Tg0 before the expansion valve of each starting indoor unit is opened are recorded.
Step S202: when the multi-connected air conditioner runs for a first preset time length, recording the current indoor ambient temperature Ta1 and the coil temperature Tg 1.
Step S203: and judging whether the target indoor unit meets | Ta0-Ta1| < A and | Tg0-Tg1| < B. If so, step S204 is performed.
The A is a first preset threshold value with the value range of 1-4 ℃, and the B is a second preset threshold value with the value range of 2-5 ℃.
If all the starting indoor units do not meet | Ta0-Ta1| < A, | Tg0-Tg1| < B, recording the current indoor environment temperature Ta1 and the coil pipe temperature Tg1 every a first preset time interval, and judging whether a target indoor unit which meets | Ta0-Ta1| < A and has heat exchange failure of | Tg0-Tg1| < B exists at present.
Step S204: and determining the heat exchange failure of the target indoor unit, recording the address of the target indoor unit, and counting the heat exchange failure times of the target indoor unit.
Step S205: and when the heat exchange failure frequency of the target indoor unit is more than or equal to 3, independently opening an expansion valve of the target indoor unit for a third preset time period, and judging whether the target indoor unit has a heat exchange fault.
After the rest indoor units are shut down to the temperature or when the temperature of the rest indoor units is close to the set temperature, the electronic expansion valves corresponding to the other indoor units are closed, the target expansion valve corresponding to the target indoor unit is independently opened, the target expansion valve corresponding to the target indoor unit is fully opened, the operation is carried out for a third preset time period t (the value is 25-50min), whether the heat exchange failure still exists in the target indoor unit is judged again, and if the heat exchange failure still exists in the target indoor unit, the heat exchange failure exists in the target indoor unit is determined.
And when the heat exchange failure frequency of the target indoor unit is less than 3, continuously returning to execute the step S202 to periodically judge whether the target indoor unit with heat exchange failure exists in the starting indoor units.
Step S206: and when the target indoor unit has a heat exchange fault, sending a fault prompt of the target indoor unit.
And if the target indoor unit has a heat exchange fault, the outer unit compressor reports a low-voltage protection fault, the inner unit is judged to be blocked, the background informs the after-sale maintenance, and the heat exchange failure times of the target indoor unit are eliminated after the maintenance is finished.
If the target indoor unit has no heat exchange fault, judging that the operating temperature condition is close to the limit to cause false alarm, recording that the target indoor unit is fault false alarm, and not judging the heat exchange failure of the target indoor unit.
Corresponding to the method for detecting the fault of the multi-connected air conditioner provided by the above embodiment, an embodiment of the present invention provides a device for detecting the fault of the multi-connected air conditioner, which can be applied to the multi-connected air conditioner, and referring to a schematic structural diagram of the device for detecting the fault of the multi-connected air conditioner shown in fig. 3, the device includes the following modules:
the monitoring module 31 is used for monitoring the indoor environment temperature and monitoring the coil temperature of the first indoor unit when the multi-connected air conditioner is started; the first indoor unit is an indoor unit in a starting state.
And the judging module 32 is configured to judge whether a target indoor unit with heat exchange failure exists in the first indoor unit based on the indoor environment temperature and the coil temperature when the first indoor unit operates for a first preset time duration.
And the verification module 33 is configured to perform fault verification on the target indoor unit when the target indoor unit with failed heat exchange exists in the first indoor unit, and determine that the target indoor unit has a fault when the fault verification passes.
According to the multi-connected air conditioner fault detection device provided by the embodiment, in the operation process of a multi-connected air conditioner, whether the target indoor unit with poor heat exchange efficiency effect exists is judged according to the indoor environment temperature and the coil pipe temperature of the indoor unit in each operation state, further fault verification is carried out on the target indoor unit with poor heat exchange effect, the indoor unit with the fault can be accurately detected, and the accuracy of multi-connected air conditioner fault detection is improved.
In an embodiment, the determining module 32 is further configured to obtain a first indoor ambient temperature and a first coil temperature corresponding to the first indoor unit before each expansion valve is opened; when the first indoor unit operates for a first preset time length, acquiring a current second indoor environment temperature and a second coil temperature of the first indoor unit every second preset time length, calculating a first temperature difference value between the first indoor environment temperature and the second indoor environment temperature, and calculating a second temperature difference value between the first coil temperature and the second coil temperature; and judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the first temperature difference value and the second temperature difference value.
In an embodiment, the determining module 32 is further configured to determine that the heat exchange of the target indoor unit is failed, by taking, as the target indoor unit, the indoor unit in the first indoor unit, which satisfies that the first temperature difference is smaller than the first preset threshold and the second temperature difference is smaller than the second preset threshold.
In an embodiment, the verification module 33 is further configured to, when it is determined that the heat exchange of the target indoor unit fails, add 1 to a count result of a target counter corresponding to the target indoor unit; wherein the initial value of the target counter is 0; and when the counting result of the target counter is more than or equal to the preset times and the target indoor unit is not recorded as fault error report, controlling the multi-connected air conditioner to carry out fault verification on the target indoor unit.
In an embodiment, the verification module 33 is further configured to control a second expansion valve corresponding to the second indoor unit to close and a target expansion valve corresponding to the target indoor unit to open to a maximum opening degree when the second indoor unit is stopped when the temperature is reached, or a difference between the indoor ambient temperature corresponding to the second indoor unit and the set temperature is smaller than a third preset threshold; the second indoor units comprise all the indoor units except the target indoor unit in the first indoor unit; and when the target expansion valve runs for a third preset time length at the maximum opening, judging whether the target indoor unit has a heat exchange fault or not based on the indoor environment temperature and the coil temperature, and if so, verifying that the target indoor unit has the heat exchange fault.
In an embodiment, the verification module 33 is further configured to obtain a current third indoor environment temperature and a current third coil temperature corresponding to the target indoor unit; calculating a third temperature difference value between the third indoor environment temperature and the first indoor environment temperature, and calculating a fourth temperature difference value between the third coil temperature and the first coil temperature; and when the third temperature difference value is smaller than the first preset threshold value and the fourth temperature difference value is smaller than the second preset threshold value, determining that the target indoor unit has a heat exchange fault.
In one embodiment, the above apparatus further comprises:
and the recording module is used for recording the fault false alarm of the target indoor unit when the target indoor unit has no heat exchange fault.
And the alarm module is used for controlling the compressor to report a low-voltage protection fault when the target indoor unit has a heat exchange fault, and controlling the target counter to be reset when receiving an instruction of completing the overhaul of the target indoor unit.
According to the fault detection device for the multi-connected air conditioner, after the multi-connected air conditioner is started to operate for a period of time, the heat exchange capacity of the indoor unit is judged according to the indoor environment temperature before and after the multi-connected air conditioner is started and the coil pipe temperature change conditions, the indoor unit with weak heat exchange capacity can be screened out, the fault of the indoor unit of the multi-connected air conditioner can be accurately identified through single fault verification of the indoor unit with weak heat exchange capacity, and the fault of the multi-connected air conditioner can be identified in advance under the condition that the air conditioning unit is not obviously abnormal.
Corresponding to the multi-connected air conditioner fault detection method provided by the above embodiment, the embodiment provides a multi-connected air conditioner, which includes a computer readable storage medium storing a computer program and a processor, and when the computer program is read and executed by the processor, the multi-connected air conditioner fault detection method provided by the above embodiment is implemented.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the embodiment of the multi-connected air conditioner fault detection method, and can achieve the same technical effects, and in order to avoid repetition, the details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
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.
Finally, it should also be noted that, herein, 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 embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The multi-connected air conditioner fault detection device and the multi-connected air conditioner disclosed by the embodiment correspond to the multi-connected air conditioner fault detection method disclosed by the embodiment, so that the description is relatively simple, and relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed 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 multi-connected air conditioner fault detection method is characterized by comprising the following steps:
when the multi-connected air conditioner is started, monitoring the indoor environment temperature and monitoring the coil temperature of the first indoor unit;
the first indoor unit is an indoor unit in a starting state;
when the first indoor unit runs for a first preset time length, judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the indoor environment temperature and the coil pipe temperature;
if so, carrying out fault verification on the target indoor unit, and confirming that the target indoor unit has a fault when the fault verification passes.
2. The multi-connected air conditioner fault detection method as claimed in claim 1, wherein the step of determining whether a target indoor unit with heat exchange failure exists in the first indoor unit based on the indoor ambient temperature and the coil temperature includes:
acquiring a first indoor environment temperature and a first coil pipe temperature corresponding to the first indoor unit before each expansion valve is opened;
when the first indoor unit operates for a first preset time length, acquiring a current second indoor environment temperature and a second coil temperature of the first indoor unit every second preset time length, calculating a first temperature difference value between the first indoor environment temperature and the second indoor environment temperature, and calculating a second temperature difference value between the first coil temperature and the second coil temperature;
and judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the first temperature difference value and the second temperature difference value.
3. The multi-connected air conditioner fault detection method as claimed in claim 2, wherein the step of determining whether a target indoor unit with heat exchange failure exists in the first indoor unit based on the first temperature difference value and the second temperature difference value comprises:
and taking the indoor unit meeting the condition that the first temperature difference is smaller than a first preset threshold value and the second temperature difference is smaller than a second preset threshold value in the first indoor unit as a target indoor unit, and determining that the target indoor unit fails in heat exchange.
4. The multi-connected air conditioner fault detection method as claimed in claim 2, wherein the step of performing fault verification on the target indoor unit comprises:
when the heat exchange failure of the target indoor unit is determined, adding 1 to the counting result of a target counter corresponding to the target indoor unit; wherein the initial value of the target counter is 0;
and when the counting result of the target counter is greater than or equal to the preset times and the target indoor unit is not recorded as fault error report, controlling the multi-connected air conditioner to carry out fault verification on the target indoor unit.
5. The multi-connected air conditioner fault detection method as claimed in claim 4, wherein the step of controlling the multi-connected air conditioner to perform fault verification on the target indoor unit comprises:
when a second indoor unit is stopped when reaching a temperature, or the difference value between the indoor environment temperature corresponding to the second indoor unit and the set temperature is smaller than a third preset threshold value, controlling a second expansion valve corresponding to the second indoor unit to be closed, and controlling a target expansion valve corresponding to the target indoor unit to be opened to the maximum opening degree; the second indoor units comprise all the indoor units except the target indoor unit in the first indoor unit;
and when the target expansion valve runs for a third preset time length at the maximum opening, judging whether the target indoor unit has a heat exchange fault or not based on the indoor environment temperature and the coil temperature, and if so, verifying that the target indoor unit has the heat exchange fault.
6. The multi-connected air conditioner fault detection method as claimed in claim 5, wherein the step of determining whether the target indoor unit has a heat exchange fault based on the indoor ambient temperature and the coil temperature includes:
acquiring the current third indoor environment temperature and the current third coil temperature corresponding to the target indoor unit; calculating a third temperature difference value between the third indoor environment temperature and the first indoor environment temperature, and calculating a fourth temperature difference value between the third coil temperature and the first coil temperature;
and when the third temperature difference value is smaller than a first preset threshold value and the fourth temperature difference value is smaller than a second preset threshold value, determining that the target indoor unit has a heat exchange fault.
7. The multi-connected air conditioner fault detection method as claimed in claim 5, further comprising:
when the target indoor unit has no heat exchange fault, recording the target indoor unit as a fault false alarm;
alternatively, the first and second electrodes may be,
and when the target indoor unit has a heat exchange fault, controlling a compressor to report a low-voltage protection fault, and when receiving an instruction of completing the overhaul of the target indoor unit, controlling the target counter to be reset.
8. The utility model provides a many online air conditioner fault detection device which characterized in that includes:
the monitoring module is used for monitoring the indoor environment temperature and monitoring the coil temperature of the first indoor unit when the multi-connected air conditioner is started; the first indoor unit is an indoor unit in a starting state;
the judging module is used for judging whether a target indoor unit with heat exchange failure exists in the first indoor unit or not based on the indoor environment temperature and the coil pipe temperature when the first indoor unit runs for a first preset time length;
and the verification module is used for performing fault verification on the target indoor unit when the target indoor unit with failed heat exchange exists in the first indoor unit, and confirming that the target indoor unit has a fault when the fault verification is passed.
9. A multi-connected air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and executing the method according to 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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Effective date of registration: 20221020 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Applicant after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. Applicant before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |
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