CN111706959B - Electronic expansion valve fault detection method and device for multi-split air conditioner and air conditioner - Google Patents
Electronic expansion valve fault detection method and device for multi-split air conditioner and air conditioner Download PDFInfo
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- CN111706959B CN111706959B CN202010542031.5A CN202010542031A CN111706959B CN 111706959 B CN111706959 B CN 111706959B CN 202010542031 A CN202010542031 A CN 202010542031A CN 111706959 B CN111706959 B CN 111706959B
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- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 239000003507 refrigerant Substances 0.000 claims abstract description 58
- 230000002159 abnormal effect Effects 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims description 32
- 230000005856 abnormality Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 13
- 230000006870 function Effects 0.000 description 9
- 238000004891 communication Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000008439 repair process Effects 0.000 description 5
- 238000004590 computer program Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010977 unit operation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000007983 Tris buffer Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
- F24F11/70—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
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Combustion & Propulsion (AREA)
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- Biomedical Technology (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The application relates to the technical field of intelligent household appliances, and discloses a fault detection method for an electronic expansion valve of a multi-split air conditioner, which comprises the steps of acquiring a target electronic expansion valve with abnormal operation; adjusting the opening of the auxiliary electronic expansion valve, and performing throttling control on a refrigerant pipeline where the target electronic expansion valve is located; the auxiliary electronic expansion valve is communicated with a refrigerant pipeline where the target electronic expansion valve is located; and under the condition that the operation parameters of the indoor unit corresponding to the target electronic expansion valve are normal, determining the target electronic expansion valve as a fault electronic expansion valve, and reporting and repairing. The refrigerant pipeline where the target electronic expansion valve with abnormal operation is located is throttled and controlled by adjusting the opening of the auxiliary electronic expansion valve, and the fault of the target electronic expansion valve with abnormal operation is determined under the condition that the abnormal operation condition is relieved, so that the fault electronic expansion valve is accurately determined. The application also discloses an electronic expansion valve fault detection device for the multi-split air conditioner and the multi-split air conditioner.
Description
Technical Field
The application relates to the technical field of intelligent household appliances, in particular to a method and a device for detecting faults of an electronic expansion valve of a multi-split air conditioner and the air conditioner.
Background
An air conditioner is a widely used air conditioning apparatus, and an electronic expansion valve as a throttle part is one of core parts thereof. The failure of the electronic expansion valve can directly affect the refrigeration or heating performance of the air conditioner. In the related art, the opening degree of the electronic expansion valve is often adjusted, and whether the corresponding electronic expansion valve has a fault is determined according to the adjusted pipeline temperature change condition.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
for a multi-split air conditioner, the multi-split air conditioner has a plurality of electronic expansion valves and a plurality of indoor units corresponding to the electronic expansion valves. The indoor temperature adjusting states of different indoor units may be different, and it is difficult to determine whether the electronic expansion valve of the coil pipe fails according to the temperature of the pipeline. When the air conditioner has a refrigeration/heating fault, a method of replacing all the electronic expansion valves is often adopted for maintenance, which causes higher cost waste.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a method and a device for detecting faults of electronic expansion valves of a multi-split air conditioner and the air conditioner, and aims to solve the technical problem that in the multi-split air conditioner, when fault devices are difficult to judge in a plurality of electronic expansion valves, all replaced maintenance schemes are adopted to cause higher cost waste.
In some embodiments, the method comprises: acquiring a target electronic expansion valve with abnormal operation; adjusting the opening of the auxiliary electronic expansion valve, and performing throttling control on a refrigerant pipeline where the target electronic expansion valve is located; the auxiliary electronic expansion valve is communicated with a refrigerant pipeline where the target electronic expansion valve is located; and under the condition that the operation parameters of the indoor unit corresponding to the target electronic expansion valve are normal, determining the target electronic expansion valve as a fault electronic expansion valve, and reporting and repairing.
In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor configured to execute the above-described electronic expansion valve fault detection method for a multi-split air conditioner when executing the program instructions.
In some embodiments, the hvac system includes an electronic expansion valve failure detection apparatus as described above for the hvac system.
The electronic expansion valve fault detection method and device for the multi-split air conditioner and the air conditioner provided by the embodiment of the disclosure can realize the following technical effects:
the refrigerant pipeline where the target electronic expansion valve with abnormal operation is located is throttled and controlled by adjusting the opening of the auxiliary electronic expansion valve, and the fault of the target electronic expansion valve with abnormal operation is determined under the condition that the abnormal operation condition is relieved, so that the fault electronic expansion valve is accurately determined. The fault source is determined quickly and effectively, maintenance personnel can be accurately guided to complete the maintenance and replacement of the electronic expansion valve, time and labor are saved, and the cost of spare parts is reduced.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a schematic diagram illustrating a method for electronic expansion valve fault detection for a multi-split air conditioner according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another electronic expansion valve fault detection method for a multi-split air conditioner according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of an electronic expansion valve failure detection apparatus for a multi-split air conditioner according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another electronic expansion valve failure detection apparatus for a multi-split air conditioner according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a multi-split air conditioner according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating a connection relationship of a multi-split air conditioner according to an embodiment of the disclosure;
FIG. 7 is a schematic structural diagram of another multi-split air conditioner according to an embodiment of the present disclosure;
fig. 8 is a schematic connection diagram of another multi-split air conditioner according to an embodiment of the disclosure.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The term "plurality" means two or more unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
The multi-split air conditioner is a split air conditioner in which a plurality of indoor units share one outdoor unit, and each indoor unit can be controlled separately. Generally, a multi-split air conditioner has a plurality of electronic expansion valves corresponding to indoor units one to one.
Referring to fig. 1, an embodiment of the present disclosure provides a method for detecting a fault of an electronic expansion valve of a multi-split air conditioner, including:
in step S01, a target electronic expansion valve with abnormal operation is acquired.
Here, the method includes acquiring an electronic expansion valve with abnormal operation and/or acquiring an electronic expansion valve corresponding to an indoor unit with abnormal operation. The abnormal operation condition may include that the difference between the operation parameter of the electronic expansion valve and the parameter value in the standard state exceeds the normal range, or that the temperature adjusting function of the indoor unit cannot meet the adjusting requirement.
For the acquisition of the abnormal operation state, the operation parameters of the electronic expansion valve within a preset time length can be acquired at intervals so as to determine the operation state of the electronic expansion valve; or alternatively, the operation parameters of the temperature adjusting function of the indoor unit can be acquired at intervals so as to determine the operation state of the indoor unit.
Step S02, adjusting the opening of the auxiliary electronic expansion valve, and performing throttling control on a refrigerant pipeline where the target electronic expansion valve is located; the auxiliary electronic expansion valve is communicated with the refrigerant pipeline.
The auxiliary electronic expansion valve is another throttling component communicated with a refrigerant pipeline where the target electronic expansion valve is located. The normal control of the refrigerant pipeline is realized by adjusting the opening degree of the refrigerant pipeline instead of the throttling function of the target electronic expansion valve in the refrigerant pipeline.
And step S03, determining the target electronic expansion valve as a fault electronic expansion valve and reporting the fault electronic expansion valve when the operation parameters of the indoor unit corresponding to the target electronic expansion valve are normal.
After the auxiliary electronic expansion valve is adopted to carry out throttling control on the refrigerant pipeline, the operation parameters of the indoor unit corresponding to the refrigerant pipeline in the control mode are obtained, and under the condition that the operation parameters are normal, the indoor unit and the refrigerant pipeline corresponding to the indoor unit are not in fault, so that the reason causing the abnormal operation parameters is determined as the fault of the target electronic expansion valve, and the fault electronic expansion valve is reported for repair so as to guide maintenance personnel to carry out replacement and maintenance.
According to the method for detecting the fault of the electronic expansion valve for the multi-split air conditioner, the opening degree of the auxiliary electronic expansion valve is adjusted, throttling control is carried out on a refrigerant pipeline where a target electronic expansion valve with abnormal operation is located, the fault of the target electronic expansion valve with the abnormal operation is determined under the condition that the abnormal operation condition is removed, and the fault electronic expansion valve is accurately determined. The fault source is determined quickly and effectively, maintenance personnel can be accurately guided to complete the maintenance and replacement of the electronic expansion valve, time and labor are saved, and the cost of spare parts is reduced.
Alternatively, the target electronic expansion valve for the abnormality is determined based on the compressor discharge temperature of the multi-split air conditioner. The exhaust temperature of the compressor corresponds to the opening degree of the electronic expansion valve. For the multi-split air conditioner, the compressor is arranged in the outdoor unit, the exhaust temperature of the compressor is slightly interfered by other factors, and the electronic expansion valve corresponding to the compressor can be determined to be an abnormal target electronic expansion valve when the exhaust temperature is abnormal, or the electronic expansion valve in a running state is determined to be an abnormal target electronic expansion valve.
Optionally, the target electronic expansion valve for acquiring the abnormal operation includes: determining an indoor unit with abnormal operation parameters; and independently operating the indoor unit with abnormal operation parameters, and determining the electronic expansion valve corresponding to the indoor unit as the target electronic expansion valve under the condition that the exhaust temperature of the compressor does not meet the preset condition.
Here, the discharge temperature of the compressor at this time is obtained by operating the indoor unit having the abnormal operation parameter alone, and under this condition, the discharge temperature of the compressor is related only to the operation state of the indoor unit operated alone. When the discharge temperature of the compressor does not satisfy the preset condition, it is possible to determine that the influencing factor is related to the indoor unit that operates alone. At this time, according to step S02, the opening degree of the auxiliary electronic expansion valve is adjusted to replace the original target electronic expansion valve, and the throttle of the refrigerant pipe corresponding to the indoor unit is controlled, so that it is possible to further determine whether the cause of the failure is the target electronic expansion valve.
Optionally, the preset conditions include: the difference value between the exhaust temperature of the compressor and the set temperature is smaller than the set threshold value. Here, the set temperature is a set discharge temperature of the compressor corresponding to the operation parameter when the indoor unit is operated alone. Optionally, the set temperature is determined according to one or more of an outdoor temperature, an ambient temperature of the corresponding indoor unit, and a coil temperature of the corresponding indoor unit.
Alternatively, the set temperature is obtained according to the following manner:
Tk＝k1×Hz+k2×Ts+k3×Tr+k4 (1)
wherein HzFor the operating frequency of the compressor, TsIs the outdoor ambient temperature, TrIs the indoor ambient temperature; k is a radical of1、k2、k3、k4Is a weighted value related to the operation mode of the indoor unit. Wherein, in the heating state, k3Is a constant greater than 0, k in the cold state3Is a constant less than 0.
Optionally, the operation parameter of the indoor unit is determined according to the outdoor ambient temperature and the indoor ambient temperature corresponding to the indoor unit. The air conditioner is pre-stored with the corresponding relation between the outdoor environment temperature, the indoor environment temperature and the indoor machine operation parameters. Under different working conditions, the operation parameters of the indoor unit during independent operation are different.
Here, the operation parameters of the indoor unit include one or more of a supply air temperature, an indoor coil temperature, and an indoor unit operation current.
Further, the indoor unit for determining the abnormal operation parameters comprises: acquiring an outdoor environment temperature and an indoor environment temperature corresponding to the indoor unit; acquiring preset operation parameters corresponding to the indoor environment temperature and the outdoor environment temperature from a preset incidence relation; and when the difference value between the actual operation parameter and the preset operation parameter is larger than the set threshold value, determining that the indoor unit is the indoor unit with abnormal operation parameters. The air conditioner is preset with the correlation among the indoor environment temperature, the outdoor environment temperature and the indoor unit operation parameters. The correlation relationship includes a one-to-one correspondence relationship between the outdoor ambient temperature, and the operation parameters of the indoor unit. Therefore, the preset operation parameters of the indoor unit corresponding to the current outdoor environment temperature and the indoor environment temperature can be obtained by searching the incidence relation, and whether the indoor unit is an indoor unit with abnormal operation parameters or not is judged according to the difference between the preset operation parameters and the actual operation parameters.
According to the method for detecting the fault of the electronic expansion valve for the multi-split air conditioner, the opening degree of the auxiliary electronic expansion valve is adjusted, throttling control is carried out on a refrigerant pipeline where a target electronic expansion valve with abnormal operation is located, the fault of the target electronic expansion valve with the abnormal operation is determined under the condition that the abnormal operation condition is removed, and the fault electronic expansion valve is accurately determined. The fault source is determined quickly and effectively, maintenance personnel can be accurately guided to complete the maintenance and replacement of the electronic expansion valve, time and labor are saved, and the cost of spare parts is reduced.
As shown in fig. 2, an embodiment of the present disclosure further provides a method for detecting a fault of an electronic expansion valve of a multi-split air conditioner, including:
step S11, obtaining an operation parameter list of each indoor unit at different outdoor ambient temperatures and indoor ambient temperatures. The operation parameters in the list are the operation parameters of the indoor units recorded when each indoor unit is operated independently under different outdoor environment temperatures and indoor environment temperatures and the electronic expansion valves corresponding to the indoor units are controlled to operate at the first opening degree. Here, the first opening degree refers to an opening degree of an electronic expansion valve for detecting a failure.
Optionally, the operation parameters obtained in step S11 include the air supply temperature of the indoor unit, the indoor coil temperature, and the indoor unit operating current under the condition that the electronic expansion valve operates at the first opening degree under different outdoor environment temperatures and indoor environment temperatures; the method also comprises the temperature of the outdoor coil and the exhaust temperature of the compressor under the condition that the electronic expansion valve operates at the first opening degree.
Optionally, the first opening degree is a maximum opening degree of the electronic expansion valve.
And step S12, determining the one-to-one correspondence relationship between the electronic expansion valves and the indoor units according to the opening condition of each indoor unit. Optionally, after the first power-on, when each indoor unit is separately turned on, the electronic expansion valve is controlled to execute a corresponding reset action, so as to determine and record a one-to-one correspondence relationship between the electronic expansion valve and the indoor unit. Specifically, a pulse signal is sent to the electronic expansion valve through a main control board of the air conditioner, and the electronic expansion valve is controlled to execute a reset action.
Step S13, acquiring the actual operation parameters of the indoor unit at intervals in the operation state, and comparing the actual operation parameters with the preset operation parameters; and when the difference value between the actual operation parameter and the preset operation parameter exceeds a first threshold value, determining that the indoor unit is an indoor unit with abnormal operation parameters, and otherwise, continuously and intermittently acquiring the actual operation parameters of the indoor unit in the operation state.
After the indoor unit is started, the actual operation parameters of the indoor unit are obtained, the actual operation parameters are compared with the same outdoor environment temperature and the indoor environment temperature corresponding to the indoor unit, and when the actual operation parameters are different from the preset operation parameters, the indoor unit is determined to be the indoor unit with abnormal operation parameters.
Alternatively, the interval time for acquiring the operation parameters may be set according to actual conditions. And may be 30 seconds, 60 seconds, 90 seconds, or 120 seconds.
Specifically, the first threshold value is related to a value of a preset operating parameter. Optionally, the first threshold is set to 20% of the preset operation parameter, that is, when the difference between the actual operation parameter and the corresponding preset operation parameter exceeds 20% of the preset operation parameter, the indoor unit is determined to be an operation parameter abnormal indoor unit.
Step S14, other indoor units are closed, the indoor unit with the abnormal operation parameters is independently operated, the actual exhaust temperature of the compressor in the state is obtained, and the actual exhaust temperature is compared with the preset exhaust temperature; and when the difference value between the actual exhaust temperature and the preset exhaust temperature exceeds a second threshold value, determining the electronic expansion valve corresponding to the indoor unit as a target electronic expansion valve.
When the indoor unit with the abnormal operation parameters is operated independently, the opening degree of the corresponding electronic expansion valve is adjusted to the first opening degree, the actual exhaust temperature of the compressor in the state is obtained, the actual exhaust temperature of the compressor is compared with the preset exhaust temperature of the compressor under the conditions of the same outdoor environment temperature and the same indoor environment temperature, and when a large difference exists between the actual exhaust temperature and the preset exhaust temperature, the electronic expansion valve corresponding to the indoor unit with the abnormal operation parameters is determined to be the target electronic expansion valve. That is, the electronic expansion valve is suspected to be a malfunctioning electronic expansion valve.
Specifically, the second threshold value is related to a value of the preset exhaust temperature, and optionally, the second threshold value is set to 30% of the preset exhaust temperature, that is, when a difference between the actual exhaust temperature and the preset exhaust temperature exceeds 20% of the preset exhaust temperature, the electronic expansion valve corresponding to the indoor unit with the abnormal operation parameter is determined as the target electronic expansion valve.
Optionally, when the difference between the actual exhaust temperature and the preset exhaust temperature is less than or equal to the second threshold, the operation returns to step S13 to continue to acquire the actual operation parameters of the indoor unit in the operating state at intervals, or the failure of the electronic expansion valve corresponding to the indoor unit is exhausted, and other components are continuously adjusted to determine the cause of the parameter abnormality.
Step S15, adjusting the opening of the auxiliary electronic expansion valve, and performing throttling control on a refrigerant pipeline where the target electronic expansion valve is located; the auxiliary electronic expansion valve is communicated with the refrigerant pipeline.
When other indoor units are in a closed state, the auxiliary electronic expansion valve performs throttling control on a refrigerant pipeline where the target electronic expansion valve is located; the normal control of the refrigerant pipeline is realized by adjusting the opening degree of the refrigerant pipeline instead of the throttling function of the target electronic expansion valve in the refrigerant pipeline.
And step S16, determining the target electronic expansion valve as a fault electronic expansion valve and reporting the fault electronic expansion valve when the operation parameters of the indoor unit corresponding to the target electronic expansion valve are normal.
After the auxiliary electronic expansion valve is adopted to perform throttling control on the refrigerant pipeline, the operation parameters of the indoor unit corresponding to the refrigerant pipeline in the control mode are obtained, and under the condition that the operation parameters are normal, the indoor unit and the refrigerant pipeline corresponding to the indoor unit are not in fault, so that the reason causing the abnormal operation parameters is determined as the fault of the target electronic expansion valve, and the fault electronic expansion valve is reported for repair so as to guide a maintenance worker to replace and maintain.
Optionally, the computer board of the control outdoor unit displays a code of the faulty electronic expansion valve for a service person to identify, so as to replace the faulty electronic expansion valve.
According to the method for detecting the fault of the electronic expansion valve for the multi-split air conditioner, the opening degree of the auxiliary electronic expansion valve is adjusted, throttling control is carried out on a refrigerant pipeline where a target electronic expansion valve with abnormal operation is located, the fault of the target electronic expansion valve with the abnormal operation is determined under the condition that the abnormal operation condition is removed, and the fault electronic expansion valve is accurately determined. The fault source is determined quickly and effectively, maintenance personnel can be accurately guided to complete the maintenance and replacement of the electronic expansion valve, time and labor are saved, and the cost of spare parts is reduced.
Referring to fig. 3, an embodiment of the present disclosure provides an electronic expansion valve fault detection apparatus for a multi-split air conditioner, including a target electronic expansion valve obtaining module 21, an auxiliary electronic expansion valve adjusting module 22, and a fault determination and repair module 23. The target electronic expansion valve acquisition module 21 is configured to acquire a target electronic expansion valve that is abnormally operated; the auxiliary electronic expansion valve adjusting module 22 is configured to adjust an opening degree of the auxiliary electronic expansion valve and perform throttling control on a refrigerant pipeline where the target electronic expansion valve is located; the auxiliary electronic expansion valve is communicated with a refrigerant pipeline where the target electronic expansion valve is located; the failure determination and repair reporting module 23 is configured to determine that the target electronic expansion valve is a failed electronic expansion valve and report the failure if the indoor unit operation parameters corresponding to the target electronic expansion valve are normal.
By adopting the electronic expansion valve fault detection device for the multi-split air conditioner, which is provided by the embodiment of the disclosure, the throttling control of the refrigerant pipeline where the target electronic expansion valve with abnormal operation is located is realized by adjusting the opening degree of the auxiliary electronic expansion valve, and the fault of the target electronic expansion valve with abnormal operation is determined under the condition that the abnormal operation condition is removed, so that the fault electronic expansion valve is accurately determined. The fault source is determined quickly and effectively, maintenance personnel can be accurately guided to complete the maintenance and replacement of the electronic expansion valve, time and labor are saved, and the cost of spare parts is reduced.
Optionally, the electronic expansion valve fault detection apparatus for a multi-split air conditioner further includes an operating parameter pre-storing module. The operation parameter pre-storage module is configured to obtain an operation parameter list of each indoor unit under different outdoor environment temperatures and indoor environment temperatures; the operation parameters in the list are the operation parameters of the indoor units recorded when each indoor unit is operated independently under different outdoor environment temperatures and indoor environment temperatures and the electronic expansion valves corresponding to the indoor units are controlled to operate at the first opening degree.
Referring to fig. 4, an electronic expansion valve fault detection apparatus for a multi-split air conditioner according to an embodiment of the present disclosure includes a processor (processor)100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface)102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to execute the electronic expansion valve fault detection method for a multi-split air conditioner according to the above embodiment.
In addition, the logic instructions in the memory 101 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products.
The memory 101, which is a computer-readable storage medium, may be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes functional applications and data processing by executing program instructions/modules stored in the memory 101, that is, implements the electronic expansion valve fault detection method for a multi-split air conditioner in the above embodiments.
The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a nonvolatile memory.
The embodiment of the disclosure provides a multi-split air conditioner, as shown in fig. 5 and 6, which includes an outdoor unit 1 and a plurality of indoor units 2, wherein the outdoor unit 1 is connected with the plurality of indoor units 2 one by one through a plurality of refrigerant branch pipes 4, and the refrigerant branch pipes 4 are all provided with electronic expansion valves 3, and the multi-split air conditioner further includes the electronic expansion valve fault detection device for the multi-split air conditioner.
Optionally, the multi-split air conditioner further comprises an auxiliary line 5, a solenoid valve 6 and a controller 7. The auxiliary pipeline 5 is used for communicating the adjacent refrigerant branch pipelines 4; the joint of the auxiliary pipeline 5 and the refrigerant branch pipeline 4 is positioned between the electronic expansion valve 3 of the refrigerant branch pipeline 4 and the corresponding indoor unit 2; the electromagnetic valve 6 is arranged on the refrigerant branch pipeline 4 and is arranged between the electronic expansion valve 3 of the refrigerant branch pipeline 4 and the outdoor unit 1; the controller 7 is connected to the solenoid valve 6, and is configured to control opening or closing of the solenoid valve 6.
Optionally, in the multi-split air conditioner, at least one connection part of the auxiliary pipeline 5 is arranged on the refrigerant branch pipeline 4 where the indoor unit 2 is located.
In actual operation, the method for detecting a failure of an electronic expansion valve for a multi-split air conditioner will be described by taking a multi-split air conditioner having two indoor units 2 as an example, as shown in fig. 7 and 8.
The illustrated multi-split air conditioner includes an outdoor unit 1, a first indoor unit 11, and a second indoor unit 12; the outdoor unit 1 is connected to the first indoor unit 11 through a first refrigerant branch line 16, and is connected to the second indoor unit 12 through a second refrigerant branch line 17. The first electronic expansion valve 14 and the second electronic expansion valve 15 are respectively provided in a first refrigerant branch pipe 16 and a second refrigerant branch pipe 17. The multi-split air conditioner also comprises an auxiliary pipeline 5, wherein a first connecting part of the auxiliary pipeline 5 is positioned between the first electronic expansion valve 14 of the first refrigerant branch pipeline 16 and the first indoor unit 11; the second connection point of the auxiliary line 5 is located between the second electronic expansion valve 15 of the second refrigerant branch line 17 and the second indoor unit 12. A first electromagnetic valve 18 is arranged between the outdoor unit 1 and the first electronic expansion valve 14; a second solenoid valve 19 is provided between the outdoor unit 1 and the second electronic expansion valve 15. The controller 7 is connected to a first solenoid valve 18 and a second solenoid valve 19, respectively.
The multi-split air conditioner has pre-stored therein respective operating parameters of the first indoor unit 11 and the second indoor unit 12 at different outdoor ambient temperatures and indoor ambient temperatures. The air conditioner comprises one or more of the air supply temperature of the indoor unit, the temperature of the indoor coil, the working current of the indoor unit, the temperature of the outdoor coil and the exhaust temperature of the compressor.
And after starting the machine, determining the one-to-one corresponding relation between the electronic expansion valves and the indoor machines according to the opening condition of the indoor machines. The actual operation parameters of the first indoor unit 11 and the second indoor unit 12 in the operation state are acquired at intervals and compared with the prestored operation parameters. For example, when the supply air temperature of the first indoor unit 11 is detected to be lower than 80% of the preset operation parameter value, the first indoor unit 11 is determined as an operation parameter abnormal indoor unit. And closing the second indoor unit 12, operating the first indoor unit 11 alone, acquiring the actual exhaust temperature of the compressor in the state, comparing the actual exhaust temperature with the preset exhaust temperature, and determining that the first electronic expansion valve 18 corresponding to the first indoor unit 11 is the target electronic expansion valve when the actual exhaust temperature and the preset exhaust temperature have a large difference, namely, the fault is suspected.
At this time, in a state where the first indoor unit 11 is operated alone, the controller 7 controls the first solenoid valve 18 to be closed and the second solenoid valve 19 to be opened. In this way, the second electronic expansion valve 15 performs throttle control as an auxiliary electronic expansion valve on the refrigerant branch line in which the first indoor unit 11 is located. At this time, after the refrigerant is discharged from the outdoor unit 1, the refrigerant passes through the opened second solenoid valve 19, is subjected to throttle control by the auxiliary electronic expansion valve (second electronic expansion valve 15), and then enters the first indoor unit 11 through the auxiliary pipe 5, and when the operation parameters of the first indoor unit 11 are normal in this state, the first electronic expansion valve 14 is determined to be a malfunctioning electronic expansion valve, and a repair is reported.
The multi-split air conditioner provided by the embodiment of the disclosure realizes throttling control of a refrigerant pipeline where a target electronic expansion valve with abnormal operation is located by adjusting the opening degree of the auxiliary electronic expansion valve, determines the fault of the target electronic expansion valve with abnormal operation under the condition of removing the abnormal operation condition, and realizes accurate determination of the fault electronic expansion valve. The fault source is determined quickly and effectively, maintenance personnel can be accurately guided to complete the maintenance and replacement of the electronic expansion valve, time and labor are saved, and the cost of spare parts is reduced
Embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions configured to perform the above-mentioned electronic expansion valve fault detection method for a multi-split air conditioner.
Embodiments of the present disclosure provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the above-described electronic expansion valve fault detection method for a multi-split air conditioner.
The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.
The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes, and may also be a transient storage medium.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosures, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure 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 flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Claims (10)
1. A method for detecting faults of electronic expansion valves of a multi-split air conditioner, wherein the multi-split air conditioner comprises an outdoor unit and a plurality of indoor units, the outdoor unit is connected with the indoor units one by one through a plurality of refrigerant branch pipelines, and the refrigerant branch pipelines are provided with the electronic expansion valves, and the method is characterized by comprising the following steps:
acquiring a target electronic expansion valve with abnormal operation;
adjusting the opening of the auxiliary electronic expansion valve, and performing throttling control on a refrigerant branch pipeline where the target electronic expansion valve is located; the auxiliary electronic expansion valve is communicated with a refrigerant branch pipeline where the target electronic expansion valve is located through an auxiliary pipeline; the auxiliary pipeline is used for communicating the adjacent refrigerant branch pipelines; the joint of the auxiliary pipeline and the refrigerant branch pipeline is positioned between the electronic expansion valve of the refrigerant branch pipeline and the corresponding indoor unit;
and under the condition that the operation parameters of the indoor unit corresponding to the target electronic expansion valve are normal, determining the target electronic expansion valve as a fault electronic expansion valve, and reporting and repairing.
2. The method of claim 1, wherein the target electronic expansion valve for the abnormality is determined according to a discharge temperature of a compressor of the multi-split air conditioner.
3. The method for detecting according to claim 2, wherein said acquiring a target electronic expansion valve with an abnormal operation comprises:
determining an indoor unit with abnormal operation parameters;
and independently operating the indoor unit with abnormal operation parameters, and determining the electronic expansion valve corresponding to the indoor unit as a target electronic expansion valve under the condition that the exhaust temperature of the compressor does not meet the preset condition.
4. The detection method according to claim 3, wherein the preset condition comprises: the difference value between the exhaust temperature of the compressor and the set temperature is smaller than the set threshold value.
5. The detection method according to claim 3, wherein the operation parameters of the indoor unit are determined according to an outdoor ambient temperature and an indoor ambient temperature corresponding to the indoor unit.
6. The detection method according to claim 5, wherein the operating parameters of the indoor unit include one or more of supply air temperature, indoor coil temperature, and indoor unit operating current.
7. The method according to claim 6, wherein the indoor unit for determining the abnormal operation parameter comprises:
acquiring an outdoor environment temperature and an indoor environment temperature corresponding to the indoor unit;
acquiring preset operation parameters corresponding to the indoor environment temperature and the outdoor environment temperature from a preset incidence relation;
and when the difference value between the actual operation parameter and the preset operation parameter is larger than a set threshold value, determining that the indoor unit is the indoor unit with abnormal operation parameters.
8. An electronic expansion valve fault detection apparatus for a multi-split air conditioner, comprising a processor and a memory storing program instructions, wherein the processor is configured to execute the electronic expansion valve fault detection method for the multi-split air conditioner according to any one of claims 1 to 7 when executing the program instructions.
9. A hvac system including the electronic expansion valve failure detection apparatus of claim 8.
10. The multi-split air conditioner as claimed in claim 9, further comprising:
the electromagnetic valve is arranged on the refrigerant branch pipeline and is arranged between the electronic expansion valve of the refrigerant branch pipeline and the outdoor unit;
a controller connected with the solenoid valve and configured to control opening or closing of the solenoid valve.
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| CN202010542031.5A CN111706959B (en) | 2020-06-15 | 2020-06-15 | Electronic expansion valve fault detection method and device for multi-split air conditioner and air conditioner |
| PCT/CN2021/102700 WO2021223778A1 (en) | 2020-06-15 | 2021-06-28 | Electronic expansion valve failure detection method and device for multi-split air conditioner, and air conditioner |
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| CN202010542031.5A CN111706959B (en) | 2020-06-15 | 2020-06-15 | Electronic expansion valve fault detection method and device for multi-split air conditioner and air conditioner |
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| CN111706959B (en) * | 2020-06-15 | 2022-03-29 | 青岛海尔空调器有限总公司 | Electronic expansion valve fault detection method and device for multi-split air conditioner and air conditioner |
| CN113531773B (en) * | 2021-06-18 | 2022-11-15 | 宁波奥克斯电气股份有限公司 | Multi-connected air conditioner fault detection method and device and multi-connected air conditioner |
| CN113446193B (en) * | 2021-06-23 | 2022-10-28 | 珠海横琴能源发展有限公司 | Control method and device of centralized control refrigeration system and centralized control refrigeration system |
| CN113660831A (en) * | 2021-08-06 | 2021-11-16 | 珠海格力电器股份有限公司 | Heat dissipation system, air conditioning unit and air conditioning unit control method |
| CN114383259B (en) * | 2021-12-16 | 2023-05-05 | 珠海格力电器股份有限公司 | Two-way valve fault detection method and air conditioner using same |
| CN114576798B (en) * | 2022-03-29 | 2023-08-08 | 青岛海信日立空调系统有限公司 | Multi-split air conditioning system and control method thereof |
| CN114754413B (en) * | 2022-04-11 | 2023-10-27 | 青岛海信日立空调系统有限公司 | Multi-split air conditioning system and fault positioning method |
| CN114811833A (en) * | 2022-04-22 | 2022-07-29 | 青岛海尔空调器有限总公司 | Method and device for controlling air conditioner, air conditioner and storage medium |
| CN115164454B (en) * | 2022-07-11 | 2024-02-27 | 珠海格力电器股份有限公司 | Control method and control device for electronic expansion valve body |
| CN115585534B (en) * | 2022-11-03 | 2024-10-18 | 珠海格力电器股份有限公司 | Automatic air conditioner fault maintenance method, air conditioner and storage medium |
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| JP4258867B2 (en) * | 1998-11-06 | 2009-04-30 | 株式会社富士通ゼネラル | Air conditioner |
| JP2001174090A (en) * | 1999-12-20 | 2001-06-29 | Fujitsu General Ltd | Multiple-chamber air-conditioner |
| CN1172145C (en) * | 2001-05-14 | 2004-10-20 | 广东科龙电器股份有限公司 | Apparatus capable of replacing electronic expansion valve in outdoor unit of air-conditioning system |
| CN102401447B (en) * | 2011-05-24 | 2014-04-16 | 宁波奥克斯电气有限公司 | Method for processing disorderly closedown caused by partial blockage of inside pipeline of varied refrigerant volume (VRV) air-conditioning chamber |
| CN104006497B (en) * | 2014-05-26 | 2017-06-30 | 广东美的集团芜湖制冷设备有限公司 | The control method and device of the cold medium flux of multi-split air conditioner |
| CN104482638A (en) * | 2014-12-09 | 2015-04-01 | 广东美的制冷设备有限公司 | Air conditioner and fault detection method for electronic expansion valve of air conditioner |
| CN106287986A (en) * | 2016-09-29 | 2017-01-04 | 广东美的制冷设备有限公司 | A kind of air-conditioner and control method thereof |
| CN108679779B (en) * | 2018-05-03 | 2020-06-05 | 广东美的制冷设备有限公司 | Air conditioner outdoor unit, air conditioner, control method, controller and storage medium |
| CN111706959B (en) * | 2020-06-15 | 2022-03-29 | 青岛海尔空调器有限总公司 | Electronic expansion valve fault detection method and device for multi-split air conditioner and air conditioner |
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