CN111271818B - Method for detecting misconnection of pipelines of multi-connected indoor unit, air conditioner and computer-readable storage medium - Google Patents

Method for detecting misconnection of pipelines of multi-connected indoor unit, air conditioner and computer-readable storage medium Download PDF

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CN111271818B
CN111271818B CN201911267712.9A CN201911267712A CN111271818B CN 111271818 B CN111271818 B CN 111271818B CN 201911267712 A CN201911267712 A CN 201911267712A CN 111271818 B CN111271818 B CN 111271818B
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temperature
liquid
air conditioner
misconnection
detecting
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CN111271818A (en
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刘永超
章秋平
刘合心
黄春
程相欣
方长顺
武浩
郭玉洁
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/38—Failure diagnosis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

Abstract

The invention provides a method for detecting misconnection of pipelines of a multi-connected indoor unit, an air conditioner and a computer readable storage medium, wherein the method for detecting misconnection of the pipelines of the multi-connected indoor unit comprises the following steps: s1Starting the air conditioner and controlling the initial valve step A of the electronic expansion valve1Running the furnace; s2A preset time t1Then, the liquid pipe temperature T of the heat exchanger of each internal machine is detectedLiquid jMiddle tube temperature TMiddle jTracheal temperature TGas j；S3If the absolute value of T is satisfied for each internal unitLiquid j‑TMiddle j|≤△T1，|TMiddle j‑TGas j|≤△T2And the valve step of the electronic expansion valve is the minimum preset valve step AminAnd judging and prompting the user that the indoor air and liquid pipes are connected in error. The invention can automatically and accurately identify the problem of wrong connection of the air pipe and the liquid pipe in the air conditioner indoor unit based on the operation parameters of the air conditioner, thereby conveniently and quickly informing personnel to overhaul, reducing the difficulty of troubleshooting problems and reducing the maintenance cost.

Description

Method for detecting misconnection of pipelines of multi-connected indoor unit, air conditioner and computer-readable storage medium
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for detecting misconnection of pipelines of a multi-connected indoor unit, an air conditioner and a computer-readable storage medium.
Background
At present, the multi-split air conditioner is connected with an outer machine through a branch pipe and a copper pipe, and each inner machine is respectively connected with an air pipe and a liquid pipe. The inner machine has different capacities, and the connected air pipe and liquid pipe have different specifications (the air pipe is larger than the liquid pipe by one specification). For the multi-connected internal machine, different cold quantity specifications are provided, and the specifications (diameter phi, unit mm) of the gas and liquid pipes connected with the internal machine are different. If the system is simultaneously connected with the indoor units with different refrigeration quantity specifications, the condition that the specifications of the air pipe and the liquid pipe are the same can exist, and at the moment, the misconnection risk exists.
As shown in fig. 1, when installed in a laboratory or by a user, an external machine is often in one space, and a different internal machine is in another space. The installation and debugging are not the same group of personnel and the process is rough, sometimes a system is formed by connecting two air pipes or two liquid pipes simultaneously by an inner machine, but the inner machine cannot form a closed loop system with an outer machine, and the refrigerant cannot circulate normally. If the whole machine is operated, the use effect of the indoor unit with the wrong connection of the connecting pipe is poor (even no refrigeration and heating effects are generated), the after-sale complaint rate and the maintenance rate are easily increased, and even part of components are damaged.
The distance between the inner machine and the outer machine is far, and the inner machine and the outer machine are installed (the connecting pipe and the connecting wire are wrapped), so that the difficulty of troubleshooting is increased for maintenance personnel. Whether the pipeline of an internal machine is normal or not needs to be detected, which is important for the subsequent operation of an air conditioning system, and the current multi-split air conditioning system is often difficult to detect the faults of air outlet and wrong liquid pipe connection by self.
Disclosure of Invention
The invention solves the problem that whether the gas-liquid pipe of the inner machine is wrong or not is judged by identifying the parameters of the inner machine through a system. The system automatically identifies the abnormal connection of the inner machine through the change condition of the parameters of the inner machine (the temperature of the liquid pipe, the temperature of the middle pipe, the temperature of the air pipe and the valve step of the electronic expansion valve) and the abnormal quantity of the inner machine, thereby timely alarming and informing personnel to maintain.
In order to solve the problems, the invention provides a method for detecting misconnection of pipelines of multiple indoor units, which is applied to an air conditioner, wherein the air conditioner comprises at least two indoor units, and the method for detecting misconnection of the pipelines of the multiple indoor units comprises the following steps: s1Starting the air conditioner and controlling the initial valve step A of the electronic expansion valve1Running the furnace; s2A preset time t1Then, the liquid pipe temperature T of the heat exchanger of each internal machine is detectedLiquid jMiddle tube temperature TMiddle jTracheal temperature TGas j；S3According to the liquid pipe temperature T of the inner machineLiquid jMiddle tube temperature TMiddle jTracheal temperature TGas jThe relationship between the two and the valve step change of the electronic expansion valve, and step S3In each internal unit, if | T is satisfiedLiquid j-TMiddle j|≤△T1，|TMiddle j-TGas j|≤△T2And the valve step of the electronic expansion valve is the minimum preset valve step AminAnd judging and prompting the user that the indoor air and liquid pipes are connected in error. Whether the pipelines of the corresponding inner machines are connected in a wrong way or not can be automatically detected by detecting and judging the relation between the temperatures of different positions of the heat exchanger and the valve step change of the electronic expansion valve, so that the realization is easy and the detection efficiency is high.
Further, A is1Is 80 to 110pls, the t is1Is 1-10min, said Δ T1Comprises the following steps: 0 ℃ to 1 ℃ of said Δ T2Comprises the following steps: 0 ℃ to 1 ℃, said AminThe range of values for the preset minimum valve step may be 55-65 pls.
Further, said Δ T1＝△T2＝0.5℃，A1＝100pls，Amin60 pls. According to the actual result, the setting can ensure the detection accuracy and the false detection and missing detection probability is lower.
Further, the detection method further comprises: s0Before starting up, detecting the temperature T of the middle pipe of the heat exchanger on each internal machineInLiquid tube temperature TLiquid iTracheal temperature TQi iAnd indoor ambient temperature TInner ring iAnd satisfy | TLiquid i-TIn|≤△T3，|TIn-TQi i|≤△T3，|TQi i-TInner ring i|≤△T3。Through self-checking before starting up, the interference of environmental factors can be effectively avoided, and the accuracy of the detection result is further improved.
Further, said Δ T3Is 0 to 1 ℃; preferably, said Δ T3Is 0.5 ℃.
Further, the valve step of the electronic expansion valve before starting up is 0 pls.
Further, the detection method further comprises a step S4And judging the temperature of the middle pipe before and after starting up aiming at the same internal unit, and if the temperature meets the absolute value TIn-TMiddle j|≤△T4And delta T is not less than 0 DEG C4And (4) judging that the air and liquid pipes of the inner machine are connected in error at the temperature of less than or equal to 1 ℃. If the indoor unit has a wrong connection of gas and liquid pipes, T can occur in a refrigeration modeIn≥TMiddle jThe case (1); if two trachea are misconnected, TIn≈TMiddle j(ii) a If the inner machine is connected with two liquid pipes in a wrong way, the liquid refrigerant is gathered in the liquid pipe, so that TIn＞TMiddle jBut the difference between the two is small, such as 0.5 ℃; if the indoor unit is normally connected, the difference between the indoor unit and the indoor unit is larger in the cooling mode, such as TIn-TMiddle jMore than 10 ℃; likewise, in the heating mode, T may occur in the heating modeIn≤TMiddle jThe case (1).
Further, the step S4Further comprising: when the air conditioner operates in the cooling mode, the ambient temperature T is detectedRing (C)If T isMiddle j＞TRing (C)Both the two connected inner pipes can be judged to be liquid pipes; when the air conditioner is operated in the heating mode, if TMiddle j＞TRing (C)It can be judged that the two connected air pipes are air pipes. The method can judge whether the pipeline is connected in a wrong way or not in different modes, and can also accurately judge whether the air pipe or the liquid pipe is connected in a wrong way or not.
Compared with the prior art, the detection method for the misconnection of the pipelines of the multi-connected indoor unit has the beneficial effects that:
(1) the detection method can quickly and accurately focus the problem source, and avoids causing higher maintenance cost;
(2) the detection method disclosed by the invention can be used for identifying the abnormal connection of the internal machine and timely alarming to inform personnel of maintenance, so that the condition that the press is burnt out when the press runs under the condition of lacking the refrigeration oil at high temperature is avoided.
(3) The invention does not need special hardware support and is easy to realize.
The present invention also provides an air conditioner, comprising: the computer readable storage medium stores a computer program, and the computer program is read by a controller and operated to realize the detection method for the misconnection of the pipelines of the multi-connected indoor unit; a controller for executing the software function module in the memory; the system comprises at least two internal machines, a heat exchanger and an electronic expansion valve connected with the heat exchanger, wherein the heat exchanger is provided with at least 4 temperature sensing bags which are respectively used for measuring the liquid pipe temperature, the middle pipe temperature, the air pipe temperature and the environment temperature of the heat exchanger, and the temperature sensing bags used for measuring the middle pipe temperature can be arranged at the lower part or the upper part of the internal machine heat exchanger as required; the multi-split air conditioner pipeline connection error prompting device generates corresponding prompting information when the air conditioner has a pipeline connection error. The indoor unit of the air conditioner can be a ducted air conditioner, a wall hanging machine or a ceiling machine, and the air conditioner is wide in application range.
The invention also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and operated by a processor, the method for detecting the misconnection of the multiple internal machine pipelines is realized.
Drawings
Fig. 1 is a schematic diagram of a multi-split system in the prior art;
fig. 2 is a schematic flow chart of a detection method for detecting misconnection of pipelines of a multi-connected indoor unit according to the invention;
FIG. 3 is a schematic flow chart illustrating the detection of a misconnection of pipes according to embodiment 2 of the present invention;
FIG. 4 is a schematic diagram of a multi-split system with misconnection of pipelines in embodiment 2 of the present invention;
FIG. 5 is a schematic diagram showing the positions of the temperature-sensing bulbs of the wall-mounted unit in embodiment 3 of the present invention;
fig. 6 is a schematic diagram of the positions of the thermal bulbs on the wind pipe machine in embodiment 3 of the present invention.
Detailed Description
In the prior art, the specifications (diameter phi, unit mm) of the gas and liquid pipes connected with the multi-split internal machines with different refrigeration specifications are different, as shown in table 1.
TABLE 1 specification of single joint of multiple internal machines with different capacities
Figure BDA0002313337830000041
If the inner machine with the code number 28 and the inner machine with the code number 71 are connected in the multi-split system at the same time, the specification of a liquid pipe connected with the 71 split system is the same as that of a gas pipe connected with the 28 split system, and the misconnection risk exists.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
As shown in fig. 2, a method for detecting misconnection of multiple indoor units is applied to an air conditioner, the air conditioner includes at least two indoor units, and the method for detecting misconnection of multiple indoor units includes: s1Starting the air conditioner and controlling the initial valve step A of the electronic expansion valve1Running the furnace; s2A preset time t1Then, the liquid pipe temperature T of the heat exchanger of each internal machine is detectedLiquid jMiddle tube temperature TMiddle jTracheal temperature TGas j；S3According to the liquid pipe temperature T of the inner machineLiquid jMiddle tube temperature TMiddle jTracheal temperature TGas jThe relationship between the two and the opening degree of the electronic expansion valve, and step S3In each internal unit, if | T is satisfiedLiquid j-TMiddle j|≤△T1，|TMiddle j-TGas j|≤△T2And the valve step of the electronic expansion valve is the minimum preset valve step AminAnd judging and prompting the user that the indoor air and liquid pipes are connected in error. The information for prompting the wrong connection of the gas pipe and the liquid pipe comprises but is not limited to the lighting of an indicator lamp or the generation of a buzzer sound by a machine set or the display of a specific fault code in a display panel and the like. Whether the pipelines of the corresponding inner machines are connected in a wrong way or not can be automatically detected by detecting and judging the relation between the temperatures of different positions of the heat exchanger and the valve step change of the electronic expansion valve, so that the realization is easy and the detection efficiency is high. Wherein the initial valve step A1Is 80 to 110pls, the t is1Is 1-10min, said Δ T1Comprises the following steps: 0 ℃ to 1 ℃ of said Δ T2Comprises the following steps: 0 ℃ to 1 ℃, said AminThe range of values for the preset minimum valve step may be 55-65 pls. Preferably, said Δ T1＝△T2＝0.5℃，A1＝100pls， Amin60 pls. According to the actual result, the setting can ensure the detection accuracy and the false detection and missing detection probability is lower. The above parameters may also be set to other values as desired.
In order to further improve the accuracy of the detection result and avoid the interference of environmental factors, the detection method further includes: s0Before starting up, detecting the temperature T of the middle pipe of the heat exchanger on each internal machineInLiquid tube temperature TLiquid iTracheal temperature TQi iAnd indoor ambient temperature TInner ring iAnd satisfy | TLiquid i-TIn|≤△T3，|T In-TQi i|≤△T3，|TQi i-TInner ring i|≤△T3. Through self-checking before starting up, the interference of environmental factors can be effectively avoided, and the detection result is further improved. Wherein said Δ T3Has a value range of 0-1 ℃ and a delta T3Can be 0.1, 0.2, 0.4, 0.6, 0.8 ℃; preferably, said Δ T3Is 0.5 ℃. At this time, the valve step of the electronic expansion valve before starting up is 0 pls.
In order to further determine whether a specific air tube or a liquid tube of the internal machine is misconnected, the detection method further comprises the step S4And for the same indoor unit, judgingThe temperature of the middle tube before and after starting up is equal to | TIn-TMiddle j|≤△T4And delta T is not less than 0 DEG C4And (4) judging that the air and liquid pipes of the inner machine are connected in error at the temperature of less than or equal to 1 ℃. If the indoor unit has a wrong connection of gas and liquid pipes, T can occur in a refrigeration modeIn≥TMiddle jThe case (1); if two trachea are misconnected, TIn≈TMiddle j(ii) a If the inner machine is connected with two liquid pipes in a wrong way, the liquid refrigerant is gathered in the liquid pipe, so that TIn＞TMiddle jBut the difference between the two is small, such as 0.5 ℃; if the indoor unit is normally connected, the difference between the indoor unit and the indoor unit is larger in the cooling mode, such as TIn-TMiddle jMore than 10 ℃; likewise, in the heating mode, T may occur in the heating modeIn≤TMiddle jIn the case where if two trachea are misconnected, TIn≈TMiddle j(ii) a If the inner machine is connected with two liquid pipes in a wrong way, TIn＜TMiddle j。
Specifically, when the air conditioner is operated in the cooling mode, the ambient temperature T is detectedRing (C)If T isMiddle j＞T Ring (C)Both the two connected inner pipes can be judged to be liquid pipes; when the air conditioner is operated in the heating mode, if TMiddle j＞TRing (C)It can be judged that the two connected air pipes are air pipes. The method can judge whether the pipeline is connected in a wrong way or not in different modes, and can also accurately judge whether the air pipe or the liquid pipe is connected in a wrong way or not.
Example 2
As shown in fig. 3, a method for detecting misconnection of multiple indoor units in pipelines is used for a multiple indoor unit system, where the multiple indoor unit system includes a multiple outdoor unit and 4 indoor units, and as shown in fig. 4, the method specifically includes:
S1before the system is started, the initial temperatures (T) of 3 pipe temperature positions (namely a liquid pipe, a middle pipe and an air pipe) on 4 internal machine evaporators are respectively detectedLiquid 1、TGas 1、TIn 1) And indoor ambient temperature TInner ring 1Wherein T isLiquid 1≈TIn 1≈TGas 1≈TInner ring 1That is, the TLiquid 1、TIn 1、TGas 1、TInner ring 1Difference Δ T between any two3Is 0 to 1 ℃; preferably,. DELTA.T3At 0.5 ℃ the valve step was 0 pls.
S2In the air conditioner operation refrigeration mode, the initial step number of an electronic expansion valve connected with an evaporator is 100pls, after the air conditioner operates for 5-10min, the air conditioner operates stably according to the temperature value of a temperature sensing bulb of each internal machine every 0.5-3 min; the temperature values measured by the temperature sensing bags on the evaporators of the 1# indoor unit and the 2# indoor unit satisfy TLiquid 2≈TIn 2≈TGas 2That is, | TLiquid 2-TIn 2|≤△T1，|TIn 2-TGas 2|≤△T2Wherein the temperature is not more than 0 ℃ and not more than delta T1≤1℃，0℃≤△T2The temperature is less than or equal to 1 ℃, and the valve steps of the electronic expansion valves of the two internal machines are both 60pls, the step S is carried out3。
Preferably, said Δ T1＝△T2＝0.5℃。
S3Judging the temperature change of the tubes in the evaporator of the 1# and 2# internal machines before and after starting up, if | TIn 1-T In 2|≤△T4Then proceed to step S4(ii) a Preferably, said Δ T4The value range of (A) is 0-1 ℃.
As one case, it may be that T is present in the 1# machineIn 1≈TIn 2At the moment, the 1# inner machine is communicated with the outer machine through two air pipes (an air pipe 1 and an air pipe 2) (namely, a liquid pipe of the 1# inner machine is connected with an air pipe of the 2# inner machine in an opposite way), so that the two inner machines do not form an effective circulating system with the outer machine, and the temperature of the front pipe and the rear pipe of the 1# inner machine is not changed when the inner machine is started; and the 2# internal machine has TIn 1＞TIn 2And the difference between the two is less than 0.6 ℃, the 2# inner machine is communicated with the outer machine through two liquid pipes (a liquid pipe 1 and a liquid pipe 2), and after the 2# inner machine is started, the temperature of the middle pipe is reduced due to the accumulation of liquid refrigerant (the 2# inner machine is equivalent to a liquid storage tank), namely TIn 1＞T In 2(ii) a As another case, it may be that T exists in the 1# machineIn 1＞TIn 2And the difference value of the two is less than 0.9 ℃, and T exists in the 2# machineIn 1≈TIn 2。
S4And judging the relation between the temperature of the middle pipe and the ambient temperature. For the 1# indoor unit, the temperature is not changed after starting up, and TIn 2≈TInner ringThat is, | TIn 2-TInner ringThe temperature is less than or equal to 0.5 ℃, for the 2# inner machine, liquid refrigerant is focused after the machine is started (the 2# inner machine is equivalent to a liquid storage tank, the temperature of the medium-pressure liquid refrigerant from the condenser is more than 35 ℃, the rated refrigeration ring temperature is 27 ℃), and at the moment, T is measuredIn 2＞TInner ringFurther, the 1# inner unit is connected with two air pipes, namely a low-pressure side, the 2# inner unit is connected with two liquid pipes, and the 1# and 2# inner units in the multi-split system have the problem of wrong pipeline connection.
S5The many connected systems send the gas-liquid pipe and connect wrong trouble suggestion, remind maintenance personal to detect this 2 interior machine takeover circumstances, when avoiding singly opening 1# interior machine refrigeration, many online systems are equivalent to low pressure side evacuation, do not have refrigerant and refrigeration oil return compressor, the risk of easy burnout after the press operation a period.
Example 3
The present invention also provides an air conditioner, comprising: the computer readable storage medium stores a computer program, and the computer program is read by a controller and operated to realize the detection method for the misconnection of the pipelines of the multi-connected indoor unit; a controller for executing the software function module in the memory; at least two internal machines, the internal machines have heat exchangers and electronic expansion valves connected, as shown in fig. 5 and fig. 6, the heat exchangers are provided with at least 4 temperature sensing bags respectively used for measuring the liquid pipe temperature, the middle pipe temperature, the air pipe temperature and the environment temperature of the heat exchangers, wherein the temperature sensing bags used for measuring the middle pipe temperature can be arranged at the lower parts of the internal machine heat exchangers according to the requirements or at the upper parts; the multi-split air conditioner pipeline connection error prompting device generates corresponding prompting information when the air conditioner has a pipeline connection error. The indoor unit of the air conditioner can be a ducted air conditioner, a wall hanging machine or a ceiling machine, and the air conditioner is wide in application range.
The invention also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read and operated by a processor, the method for detecting the misconnection of the multiple internal machine pipelines is realized. The computer-readable storage medium may be, but is not limited to, a random access memory, a read only memory, a programmable read only memory, an erasable read only memory, an electrically erasable read only memory, and the like.
It should be understood that the units described as separate parts are or are not physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
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 misconnection of the pipelines of the multiple indoor units is applied to an air conditioner, the air conditioner comprises at least two indoor units, and the method for detecting the misconnection of the pipelines of the multiple indoor units is characterized by comprising the following steps:
S1starting the air conditioner and controlling the initial valve step A of the electronic expansion valve1Running the furnace;
S2a preset time t1Then, the liquid pipe temperature T of the heat exchanger of each internal machine is detectedLiquid jMiddle tube temperature TMiddle jTracheal temperature TGas j；
S3According to the liquid pipe temperature T of the inner machineLiquid jMiddle tube temperature TMiddle jTracheal temperature TGas jThe relation between and the electronsThe opening degree of the expansion valve is changed to judge whether the pipeline of the internal machine is connected in error,
step S3In each internal unit, if | T is satisfiedLiquid j-TMiddle j|≤ΔT1，|TMiddle j-TGas j|≤ΔT2And the valve step of the electronic expansion valve is the minimum preset valve step AminThen go to step S4; the Δ T1Comprises the following steps: 0 ℃ to 1 ℃ of said Δ T2Comprises the following steps: 0 ℃ to 1 ℃, said AminIs 55-65 pls;
S4and judging the temperature of the middle pipe before and after starting up aiming at the same internal unit, and if the temperature meets the absolute value TIn-TMiddle j|≤ΔT4And delta T is not less than 0 DEG C4Judging whether the air and liquid pipes of the inner machine are connected in error at the temperature of less than or equal to 1 ℃;
when the air conditioner operates in the cooling mode, the ambient temperature T is detectedRing (C)If T isMiddle j＞TRing (C)Both the two connected inner pipes can be judged to be liquid pipes; when the air conditioner is operated in the heating mode, if TMiddle j＞TRing (C)It can be judged that the two connected air pipes are air pipes.
2. The method for detecting misconnection of multiple indoor units according to claim 1, wherein a is1Is 80 to 110pls, the t is1Is 1-10 min.
3. The method for detecting misconnection of multiple indoor units according to claim 2, wherein the Δ T is1＝ΔT2＝0.5℃，A1＝100pls，Amin＝60pls。
4. The method for detecting misconnection of multiple indoor units according to claim 1, wherein the method further comprises: s0Before starting up, detecting the temperature T of the middle pipe of the heat exchanger on each internal machineInLiquid tube temperature TLiquid iTracheal temperature TQi iAnd indoor ambient temperature TInner ring iAnd satisfy | TLiquid i-TIn|≤ΔT3，|T In-TQi i|≤ΔT3，|TQi i-TInner ring i|≤ΔT3。
5. The method for detecting misconnection of multiple indoor units according to claim 4, wherein the Δ T is3Is 0 to 1 ℃.
6. The method for detecting the misconnection of the pipelines in the multi-connected indoor unit according to claim 4, wherein the valve step of the electronic expansion valve before starting up is 0 pls.
7. An air conditioner, characterized in that the air conditioner comprises:
a computer-readable storage medium storing a computer program, which when read and executed by a controller, implements the method for detecting misconnection of multiple indoor units according to any one of claims 1 to 6;
a controller for executing the software function module in the memory;
the system comprises at least two internal machines, a control unit and a control unit, wherein the internal machines are provided with heat exchangers and electronic expansion valves connected with the heat exchangers, and the heat exchangers are provided with at least 4 temperature sensing bags;
the multi-split air conditioner pipeline connection error prompting device generates corresponding prompting information when the air conditioner has a pipeline connection error.
8. A computer-readable storage medium, storing a computer program, which when read and executed by a processor, implements the method for detecting a misconnection of multiple indoor units according to any one of claims 1 to 6.
CN201911267712.9A 2019-12-11 2019-12-11 Method for detecting misconnection of pipelines of multi-connected indoor unit, air conditioner and computer-readable storage medium Active CN111271818B (en)

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