CN110296499B - Electronic expansion valve abnormality reason judgment method and device and air conditioner - Google Patents
Electronic expansion valve abnormality reason judgment method and device and air conditioner Download PDFInfo
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- CN110296499B CN110296499B CN201910613868.1A CN201910613868A CN110296499B CN 110296499 B CN110296499 B CN 110296499B CN 201910613868 A CN201910613868 A CN 201910613868A CN 110296499 B CN110296499 B CN 110296499B
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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
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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
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Abstract
The invention provides a method and a device for judging the abnormal reason of an electronic expansion valve and an air conditioner, wherein the method for judging the abnormal reason of the electronic expansion valve is applied to an outdoor unit comprising two same heat exchange systems, and comprises the following steps: detecting the operating parameters of the two heat exchange systems in a heating mode, and judging whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal or not according to the operating parameters; if so, detecting a first defrosting temperature and a second defrosting temperature of the two heat exchange systems; and judging the reason of abnormal opening of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature. The method for judging the reason of the abnormality of the electronic expansion valve can accurately judge the reason of the abnormality of the opening of the electronic expansion valve through the defrosting temperatures of the two heat exchange systems when the opening of the electronic expansion valve of the outdoor unit of the multi-split system is abnormal, is favorable for timely maintenance and reduces the maintenance cost; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for judging the reason of abnormality of an electronic expansion valve and an air conditioner.
Background
At present, some outdoor units of multi-split systems have two heat exchange systems, that is, two sets of the same heat exchange systems are provided, and each set of the heat exchange systems is provided with a heat exchanger and an electronic expansion valve. When the system heats normally, the heat exchange conditions of the two groups of heat exchange systems are consistent, and the opening degrees of the two electronic expansion valves are basically the same. Under abnormal conditions, the opening degrees of the two electronic expansion valves have a large difference, and at the moment, the reason for the abnormal opening degrees of the two electronic expansion valves needs to be found out so as to be maintained in time. However, the conventional multi-split system cannot judge the reason of the abnormality when the opening degrees of the two electronic expansion valves are abnormal, so that the multi-split system cannot be maintained in time, and the maintenance cost is increased.
Therefore, a method for solving the problem that the conventional multi-split air conditioning system cannot determine the reason of the abnormality when the opening degrees of the two electronic expansion valves are abnormal is urgently needed by a user.
Disclosure of Invention
The invention solves the problems that: the existing multi-split system cannot judge the reason of the abnormality when the opening degrees of two electronic expansion valves of an outdoor unit are abnormal.
In order to solve the above problems, the present invention provides a method for determining the cause of abnormality of an electronic expansion valve, which is applied to an outdoor unit including two heat exchange systems of the same type, and the method includes:
detecting the operating parameters of the two heat exchange systems in a heating mode, and judging whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal or not according to the operating parameters;
if so, detecting a first defrosting temperature and a second defrosting temperature of the two heat exchange systems;
and judging the reason of abnormal opening of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature.
Therefore, when the opening of the electronic expansion valve of the outdoor unit of the multi-split system is abnormal, the reason of the abnormal opening of the electronic expansion valve can be accurately judged according to the defrosting temperatures of the two heat exchange systems, so that the maintenance can be carried out in time, and the maintenance cost is reduced; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
Optionally, in the heating mode, detecting operation parameters of the two heat exchange systems, and determining whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal according to the operation parameters includes:
in the heating mode, detecting the opening degree of a first electronic expansion valve and the opening degree of a second electronic expansion valve of the two heat exchange systems;
and judging whether the opening of the electronic expansion valve is abnormal or not according to the opening of the first electronic expansion valve and the opening of the second electronic expansion valve.
Therefore, whether the two electronic expansion valves are abnormal or not can be judged through the opening degrees of the two electronic expansion valves of the two heat exchange systems, so that the abnormal reason can be judged in time when the two electronic expansion valves are abnormal.
Optionally, in the heating mode, detecting operation parameters of the two heat exchange systems, and determining whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal according to the operation parameters includes:
in the heating mode, detecting the opening degree of a first electronic expansion valve, the opening degree of a second electronic expansion valve, the temperature of a first gas collecting pipe and the temperature of a second gas collecting pipe of the two heat exchange systems;
and judging whether the opening of the electronic expansion valve is abnormal or not according to the opening of the first electronic expansion valve, the opening of the second electronic expansion valve, the temperature of the first gas collecting pipe and the temperature of the second gas collecting pipe.
Therefore, whether the two electronic expansion valves are abnormal or not can be judged through the opening degrees of the electronic expansion valves of the two heat exchange systems and the temperature of the gas collecting pipe, so that the abnormal reason can be judged in time when the two electronic expansion valves are abnormal; and whether the electronic expansion valve is abnormal or not is judged more accurately, so that misjudgment can be avoided, and further the normal work of the outdoor unit is prevented from being influenced.
Optionally, determining whether the opening of the electronic expansion valve is abnormal according to the opening of the first electronic expansion valve, the opening of the second electronic expansion valve, the temperature of the first gas collecting pipe, and the temperature of the second gas collecting pipe, includes:
judging whether the opening of the first electronic expansion valve reaches the minimum opening or not and whether the opening of the second electronic expansion valve reaches the maximum opening or not;
if yes, judging whether the value obtained by subtracting the first gas collecting tube temperature from the second gas collecting tube temperature is larger than or equal to a first difference threshold value;
and if so, judging that the opening degree of the electronic expansion valve is abnormal.
Therefore, the abnormal states of the two electronic expansion valves can be accurately judged through the opening degrees of the electronic expansion valves of the two heat exchange systems and the temperature of the gas collecting pipe, so that the abnormal reasons can be judged in time.
Optionally, after determining whether the opening of the first electronic expansion valve reaches the minimum opening and whether the opening of the second electronic expansion valve reaches the maximum opening, if yes, determining whether a value obtained by subtracting the temperature of the first gas collecting pipe from the temperature of the second gas collecting pipe is greater than or equal to a first difference threshold, where the method further includes:
if so, judging whether the duration time that the opening degree of the first electronic expansion valve reaches the minimum opening degree and the opening degree of the second electronic expansion valve reaches the maximum opening degree reaches a first time threshold value.
Therefore, the method confirms the abnormality of the two electronic expansion valves after the abnormal states of the two electronic expansion valves last for a period of time, avoids the contingency of detection results, and enables the judgment of the states of the two electronic expansion valves to be more accurate and reliable.
Optionally, the determining, according to the first defrosting temperature and the second defrosting temperature, a reason why the opening of the electronic expansion valve is abnormal includes:
determining a difference between the first defrost temperature and the second defrost temperature;
if the value obtained by subtracting the second defrosting temperature from the first defrosting temperature is larger than or equal to a second difference threshold value, judging that the reason of the abnormal opening degree of the electronic expansion valve is wrong and wrong of the electronic expansion valve;
and if the value obtained by subtracting the first defrosting temperature from the second defrosting temperature is greater than or equal to a third difference threshold value, judging that the reason of the abnormal opening degree of the electronic expansion valve is the gas collecting pipe temperature sensing bulb error.
Therefore, the reason for the abnormal opening of the two electronic expansion valves can be accurately judged through the two defrosting temperatures, the timely maintenance is facilitated, and the maintenance cost is reduced; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
Optionally, the method further includes:
and sending out a corresponding fault code according to the abnormal reason.
Therefore, maintenance personnel can conveniently determine the fault reason according to the fault code, and timely maintenance is facilitated.
Optionally, the minimum opening degree is in a range of 40-80 pls.
The abnormal states of the two electronic expansion valves can be accurately detected in time.
Optionally, the value range of the first difference threshold is 5 to 20 ℃.
The method can avoid misjudgment caused by normal fluctuation of the temperature of the gas collecting pipe, so that the detection result is more accurate and reliable, and the detection of the abnormal state of the two electronic expansion valves can be more comprehensive.
Optionally, the value ranges of the second difference threshold and the third difference threshold are both 1-10 ℃.
The misjudgment caused by the normal fluctuation of the defrosting temperature can be avoided, and the abnormal reasons of the two electronic expansion valves can be detected in time.
Another objective of the present invention is to provide a device for determining the cause of abnormality of electronic expansion valves, so as to solve the problem that the cause of abnormality cannot be determined when the opening degrees of two electronic expansion valves of an outdoor unit are abnormal in the conventional multi-split air conditioning system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an apparatus for determining the cause of an abnormality in an electronic expansion valve, comprising:
the first detection unit is used for detecting the operating parameters of the two heat exchange systems in a heating mode;
the first judgment unit is used for judging whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal or not according to the operation parameters;
the second detection unit is used for detecting the first defrosting temperature and the second defrosting temperature of the two heat exchange systems if the opening degree of the electronic expansion valve is abnormal;
and the second judging unit is used for judging the reason of the abnormal opening of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature.
The electronic expansion valve abnormality cause determining device and the electronic expansion valve abnormality cause determining method have the same advantages as the prior art, and are not described herein again.
Another objective of the present invention is to provide an air conditioner to solve the problem that the conventional multi-split air conditioner cannot determine the cause of an abnormal opening of two electronic expansion valves of an outdoor unit.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an air conditioner comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and when the computer program is read and executed by the processor, the method for judging the reason of the abnormality of the electronic expansion valve is realized.
Compared with the prior art, the air conditioner and the method for judging the reason of the abnormality of the electronic expansion valve have the same advantages, and are not repeated herein.
Another objective of the present invention is to provide a computer readable storage medium to solve the problem that the reason for the abnormality cannot be determined when the opening of the two electronic expansion valves of the outdoor unit is abnormal in the conventional multi-split air conditioning system.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a computer-readable storage medium, wherein a computer program is stored, and when the computer program is read and executed by a processor, the method for determining the cause of abnormality of an electronic expansion valve according to any one of the above aspects is implemented.
The computer readable storage medium and the method for determining the reason for the abnormality of the electronic expansion valve have the same advantages as those of the prior art, and are not described herein again.
Drawings
FIG. 1 is a flowchart illustrating a method for determining a cause of an abnormality of an electronic expansion valve according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a refrigerant flow direction of an outdoor unit of a multi-split air conditioner according to an embodiment of the present invention;
FIG. 3 is a flowchart of step S1 according to the embodiment of the present invention;
FIG. 4 is another flowchart of step S1 according to the embodiment of the present invention;
FIG. 5 is a flowchart of step S112 according to an embodiment of the present invention;
FIG. 6 is a flowchart of step S3 according to the embodiment of the present invention;
fig. 7 is a schematic diagram of an apparatus for determining an abnormality cause of an electronic expansion valve according to an embodiment of the present invention.
Description of reference numerals:
10-a first detection unit; 20-a first judgment unit; 30-a second detection unit; 40-a second judging unit; 50-electronic expansion valve; 60-a defrost temperature sensor; 70-a heat exchanger; 80-a fan; and 90-gas collecting pipe temperature sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart illustrating a method for determining the cause of an abnormality of an electronic expansion valve according to the present embodiment; the method is applied to an outdoor unit comprising two same heat exchange systems, and comprises the following steps:
step S1, detecting the operation parameters of the two heat exchange systems in the heating mode, and judging whether the opening of the electronic expansion valves of the two heat exchange systems is abnormal according to the operation parameters;
step S2, if yes, detecting a first defrosting temperature and a second defrosting temperature of the two heat exchange systems;
and step S3, determining the cause of the abnormal opening of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature.
The method for determining the cause of abnormality of the electronic expansion valve in the embodiment is applied to a multi-split air conditioning system, two identical heat exchange systems are heat exchange systems with identical heat exchange devices and heat exchange effects, and each heat exchange system is a refrigerant flow path composed of a heat exchanger, the electronic expansion valve, a gas collecting pipe, a connecting pipeline and the like. The refrigerant can be divided into two paths when flowing through the two heat exchange systems, and the two paths of refrigerants are converged after flowing out through the two heat exchange systems respectively. In order to ensure that the two same heat exchange systems are operated, the step S1 is carried out after the indoor unit of the multi-split system is fully opened for heating operation; in order to avoid the influence of normal fluctuation when the two heat exchange systems are just started on the detection result, the step S1 is performed after the indoor unit of the multi-split air conditioning system is fully turned on and is in a heating operation for a period of time and reaches a stable state. As shown in fig. 2, it is a schematic diagram of a refrigerant flow direction of an outdoor unit of the multi-split air conditioner in this embodiment, and includes two refrigerant flow paths; under normal conditions, the heat exchange conditions of the two heat exchange systems are consistent, and the opening degrees of the two electronic expansion valves and the temperatures of the two gas collecting pipes are the same.
The operation parameters are parameters capable of reflecting whether the opening degrees of the two electronic expansion valves are abnormal or not, and the first defrosting temperature and the second defrosting temperature are respectively detected by a temperature sensor arranged on one path of capillary tube at the lowest part of the heat exchangers of the two heat exchange systems.
Therefore, the embodiment can accurately judge the reason of the abnormal opening of the electronic expansion valve through the defrosting temperatures of the two heat exchange systems when the opening of the electronic expansion valve of the outdoor unit of the multi-split air conditioner is abnormal, is favorable for timely maintenance and reduces the maintenance cost; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
It should be noted that the method for determining the reason for abnormality of the electronic expansion valve is not only suitable for the outdoor units including two identical heat exchange systems, but also suitable for the outdoor units including more than two identical heat exchange systems, that is, for determining the reason for abnormality of the electronic expansion valve of any two of the identical heat exchange systems.
Optionally, in this embodiment, after the indoor unit of the multi-split air conditioning system is fully turned on to perform the heating operation for 30 minutes, the step S1 is preferably performed. Therefore, the two heat exchange systems of the outdoor unit can be ensured to reach a stable state, and the influence of normal fluctuation when the two heat exchange systems are just started on a detection result is avoided.
For convenience of understanding, as shown in fig. 2, in the following description, in this embodiment, each parameter in the first refrigerant flow path in the normal state is referred to as a first electronic expansion valve opening degree, a first header temperature, and a first defrost temperature, respectively, and each parameter in the second refrigerant flow path in the normal state is referred to as a second electronic expansion valve opening degree, a second header temperature, and a second defrost temperature, respectively.
Optionally, as shown in fig. 3, step S1 includes:
step S101, detecting the opening degree of a first electronic expansion valve and the opening degree of a second electronic expansion valve of two heat exchange systems in a heating mode;
and step S102, judging whether the opening of the electronic expansion valve is abnormal or not according to the opening of the first electronic expansion valve and the opening of the second electronic expansion valve.
In this embodiment, the abnormal electronic expansion valves of the two heat exchange systems refer to abnormal opening degrees, specifically, the difference between the opening degrees of the two electronic expansion valves is large.
Therefore, the embodiment can judge whether the two electronic expansion valves are abnormal or not through the opening degrees of the two electronic expansion valves of the two heat exchange systems, so as to judge the reason of the abnormality in time when the two electronic expansion valves are abnormal.
Alternatively, as shown in fig. 4, step S1 includes:
step S111, detecting the opening of a first electronic expansion valve, the opening of a second electronic expansion valve, the temperature of a first gas collecting pipe and the temperature of a second gas collecting pipe of the two heat exchange systems in a heating mode;
step S112, determining whether the opening of the electronic expansion valve is abnormal according to the opening of the first electronic expansion valve, the opening of the second electronic expansion valve, the temperature of the first gas collecting pipe, and the temperature of the second gas collecting pipe.
In this embodiment, if the opening degrees of the two electronic expansion valves are detected separately to determine whether the two electronic expansion valves are abnormal, there is a possibility of detection error, and if the two electronic expansion valves are judged to be abnormal by mistake when they are normal, the normal operation of the outdoor unit will be affected.
The electronic expansion valve of the heating outdoor unit is controlled by the temperature of the gas collecting pipe and the low-pressure saturation temperature together, if the value obtained by subtracting the low-pressure saturation temperature from the temperature of the gas collecting pipe is larger than the target superheat degree, the opening degree of the electronic expansion valve is increased, and more refrigerants participate in heat exchange. The temperature of the gas collecting pipe is positively correlated with the opening of the electronic expansion valve, and the larger the temperature of the gas collecting pipe is, the larger the opening of the electronic expansion valve is; on the contrary, the larger the opening degree of the electronic expansion valve is, the larger the temperature of the gas collecting pipe is inevitably. Therefore, when the electronic expansion valves of the two heat exchange systems are abnormal, the temperature of the gas collecting pipe is inevitably abnormal, and whether the electronic expansion valves of the two heat exchange systems are abnormal or not can be further confirmed through the temperature of the gas collecting pipe.
Therefore, whether the two electronic expansion valves are abnormal or not can be judged according to the opening degrees of the two electronic expansion valves of the heat exchange systems and the temperature of the gas collecting pipe, so that the reason of the abnormality can be judged in time when the two electronic expansion valves are abnormal; and whether the electronic expansion valve is abnormal or not is judged more accurately, so that misjudgment can be avoided, and further the normal work of the outdoor unit is prevented from being influenced.
Alternatively, as shown in fig. 5, step S112 includes:
step S1121, determining whether the opening degree of the first electronic expansion valve reaches a minimum opening degree and whether the opening degree of the second electronic expansion valve reaches a maximum opening degree;
step S1123, if yes, judging whether the value obtained by subtracting the first gas collecting tube temperature from the second gas collecting tube temperature is larger than or equal to a first difference threshold value;
in step S1124, if yes, it is determined that the opening degree of the electronic expansion valve is abnormal.
The first difference threshold is a preset fixed value. In an abnormal situation, in two refrigerant flow paths of the outdoor unit of the multi-split air conditioner in this embodiment, when the temperature of the first gas collecting pipe is reduced, the opening degree of the first electronic expansion valve is reduced, so that the refrigerant on the flow path where the first electronic expansion valve is located is less and less, the temperature of the second gas collecting pipe after heat exchange by the outdoor fan is greater and greater, and the opening degree of the second electronic expansion valve is greater and greater until the maximum opening degree; in a similar way, more and more refrigerants are in the other refrigerant flow path, the temperature of the first gas collecting pipe after heat exchange of the outdoor fan is smaller and smaller, and the opening degree of the second electronic expansion valve corresponding to the temperature of the first gas collecting pipe is smaller and smaller until the opening degree is the minimum. Finally, one of the two electronic expansion valves reaches the minimum opening, the other electronic expansion valve reaches the maximum opening, and the difference of the temperatures of the two gas collecting pipes is large. In this embodiment, it is further determined that the two electronic expansion valves are in an abnormal state according to the first difference threshold value obtained by subtracting the first gas collecting tube temperature from the second gas collecting tube temperature.
Thus, through steps S1121-S1124, the present embodiment can accurately determine the abnormal states of the two electronic expansion valves according to the opening degrees of the two electronic expansion valves of the heat exchange system and the temperature of the gas collecting pipe, so as to determine the cause of the abnormality in time.
It should be noted that steps S1121 and S1124 are applied to step S102, and are not described herein again.
Optionally, the value range of the first difference threshold is 5 to 20 ℃.
If the value of the first difference threshold is too small, the misjudgment caused by the normal fluctuation of the temperature of the gas collecting pipe cannot be avoided; if the value of the first difference threshold is too large, the abnormal states of the two electronic expansion valves cannot be detected comprehensively.
Therefore, the value range of the first difference threshold is preferably 5-20 ℃, so that misjudgment caused by normal fluctuation of the temperature of the gas collecting pipe can be avoided, the detection result is more accurate and reliable, and more comprehensive detection of the abnormal state of the two electronic expansion valves can be ensured.
Optionally, the first difference threshold is 10 ℃. Therefore, the detection of the abnormal states of the two electronic expansion valves can be ensured to be most comprehensive, accurate and reliable.
Optionally, as shown in fig. 5, after step S1121 and before step S1123, step S112 further includes:
in step S1122, if yes, it is determined whether the duration in which the first electronic expansion valve opening degree reaches the minimum opening degree and the second electronic expansion valve opening degree reaches the maximum opening degree reaches a first time threshold.
In the method, if the abnormality of the two electronic expansion valves is determined only by detecting that the opening degree of the first electronic expansion valve reaches the minimum opening degree and the opening degree of the second electronic expansion valve reaches the maximum opening degree, certain contingency exists and misdetermination may occur.
Therefore, the two electronic expansion valves are confirmed to be abnormal after the abnormal states of the two electronic expansion valves last for a period of time, so that the accidental detection result is avoided, and the states of the two electronic expansion valves are judged more accurately and reliably.
Optionally, in this embodiment, the first time threshold is preferably 10 min. Therefore, the accidental detection result can be avoided, the abnormal states of the two electronic expansion valves can be detected in time, and the redundant detection is avoided.
Alternatively, as shown in fig. 6, step S3 includes:
step S31, determining a difference between the first defrost temperature and the second defrost temperature;
step S32, if the value obtained by subtracting the second defrosting temperature from the first defrosting temperature is larger than or equal to a second difference threshold value, judging that the reason of the abnormal opening degree of the electronic expansion valve is wrong and wrong of the electronic expansion valve;
and step S33, if the value obtained by subtracting the first defrosting temperature from the second defrosting temperature is greater than or equal to a third difference threshold value, determining that the reason for the abnormal opening of the electronic expansion valve is the gas collecting pipe temperature sensing error.
As shown in fig. 2, electronic expansion valve mismatching means that positions of the first electronic expansion valve and the second electronic expansion valve are interchanged, and gas collector temperature sensing bulb mismatching means that positions of gas collector temperature sensing bulbs on the first flow path and the second flow path are interchanged. In this embodiment, the reasons for the abnormality of the two electronic expansion valves mainly include the electronic expansion valve error and the gas collecting pipe temperature sensing bulb error.
In two refrigerant flow paths of the two heat exchange systems of the multi-connected outdoor unit, if the two electronic expansion valves are in error, when the temperature of the first gas collecting pipe is reduced, the opening degree of the first electronic expansion valve is reduced, so that the refrigerant on the second refrigerant flow path is reduced, the temperature of the second gas collecting pipe after heat exchange of the outdoor fan is increased, and the opening degree of the second electronic expansion valve is increased to the maximum opening degree; in a similar way, more and more refrigerants are supplied to the first refrigerant flow path, the temperature of the first gas collecting pipe after heat exchange of the outdoor fan is increased, and the opening degree of the first electronic expansion valve corresponding to the temperature of the first gas collecting pipe is decreased to the minimum opening degree. Therefore, the opening degree of the first electronic expansion valve is small, the throttling of the second path of refrigerant flow path is serious, and the second defrosting temperature is low; the opening degree of the second electronic expansion valve is large, the throttling of the first path of refrigerant flow path is not serious, and the first defrosting temperature is high. Therefore, if the value obtained by subtracting the second defrosting temperature from the first defrosting temperature reaches a certain threshold value, the reason that the opening degree of the two electronic expansion valves is abnormal can be judged to be that the electronic expansion valves are false and wrong. In this embodiment, the reason for the abnormal opening degree of the two electronic expansion valves is determined to be that the electronic expansion valves are in error according to the fact that the value obtained by subtracting the second defrosting temperature from the first defrosting temperature reaches the second difference threshold value.
In two refrigerant flow paths of the two heat exchange systems of the multi-connected outdoor unit, if the temperature sensing packages of the two gas collecting pipes are wrong and inverse, when the temperature of the first gas collecting pipe is reduced, the opening degree of the first electronic expansion valve is reduced, so that the refrigerant on the first refrigerant flow path is reduced, the temperature of the second gas collecting pipe after heat exchange of the outdoor unit is increased, and the opening degree of the second electronic expansion valve is increased to the maximum opening degree; in a similar way, more and more refrigerants are in the second refrigerant flow path, the temperature of the first gas collecting pipe after heat exchange of the outdoor fan is smaller and smaller, and the opening degree of the first electronic expansion valve is smaller and smaller until the opening degree is the minimum. Therefore, the opening degree of the first electronic expansion valve is small, the first path of refrigerant flow path is seriously throttled, and the first defrosting temperature is low; the opening degree of the second electronic expansion valve is large, the throttling of the second path of refrigerant flow path is not serious, and the second defrosting temperature is high. Therefore, if the value obtained by subtracting the first defrosting temperature from the second defrosting temperature reaches a certain threshold value, the reason that the opening degree of the two electronic expansion valves is abnormal is judged to be the wrong and wrong temperature sensing bulb of the gas collecting pipe. In this embodiment, the reason that the abnormal opening degree of the two electronic expansion valves is caused by the temperature sensing package error of the gas collecting pipe is determined according to the third difference threshold value obtained by subtracting the first defrosting temperature from the second defrosting temperature.
Therefore, the embodiment can accurately judge the reason of the abnormal opening of the two electronic expansion valves through the two defrosting temperatures, is favorable for timely maintenance, and reduces the maintenance cost; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
Optionally, as shown in fig. 1, the method further includes:
and step S4, sending out corresponding fault codes according to the abnormal reasons.
Specifically, if the reason for the abnormal opening of the two electronic expansion valves is that the electronic expansion valves are wrong and wrong, a wrong and wrong fault code of the electronic expansion valves is sent out; and if the reason of the abnormal opening of the two electronic expansion valves is that the gas collecting tube temperature sensing package is wrong and wrong, sending out a fault code of the wrong gas collecting tube temperature sensing package.
Therefore, maintenance personnel can conveniently determine the fault reason according to the fault code, and timely maintenance is facilitated.
Optionally, the minimum opening degree is in a range of 40-80 pls.
If the value of the minimum opening degree is too small, the abnormal states of the two electronic expansion valves cannot be detected in time; if the minimum opening is too large, the accuracy of detecting the abnormal state of the two electronic expansion valves is difficult to ensure. Where pls represents the unit "step" of the electronic expansion valve opening.
Thus, in this embodiment, the minimum opening preferably has a value in the range of 40-80pls, so as to ensure timely and accurate detection of the abnormal states of the two electronic expansion valves. The minimum opening degree is preferably 60pls, and the abnormal state of the two electronic expansion valves can be detected most timely and accurately.
Optionally, the maximum opening is 480 pls. Therefore, the safety of the electronic expansion valve and the accuracy of an abnormal detection result can be ensured.
Optionally, the value ranges of the second difference threshold and the third difference threshold are both 1-10 ℃.
If the values of the second difference threshold and the third difference threshold are too small, the influence of normal fluctuation of the defrosting temperature on the detection result cannot be eliminated, and misjudgment cannot be avoided; if the values of the second difference threshold and the third difference threshold are too large, the abnormality reasons of the two electronic expansion valves cannot be detected in time.
Thus, in the embodiment, the value ranges of the second difference threshold and the third difference threshold are preferably 1-10 ℃, so that misjudgment caused by normal fluctuation of the defrosting temperature can be avoided, and the abnormal reasons of the two electronic expansion valves can be detected in time.
Alternatively, the second difference threshold is preferably 4 ℃ and the third difference threshold is preferably 4 ℃. Therefore, the comprehensive effect of avoiding misjudgment and detecting the abnormal reason timeliness is best.
This embodiment still provides an electronic expansion valve anomaly reason judgment device, includes:
the first detection unit 10 is used for detecting the operation parameters of the two heat exchange systems in the heating mode;
the first judging unit 20, the first judging unit 20 is configured to judge whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal according to the operation parameters;
a second detecting unit 30, where the second detecting unit 30 is configured to detect a first defrosting temperature and a second defrosting temperature of the two heat exchange systems if the opening degree of the electronic expansion valve is abnormal;
a second determining unit 40, where the second determining unit 40 is configured to determine a cause of the abnormal opening degree of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature.
The electronic expansion valve abnormity reason judgment device of the embodiment can accurately judge the reason of the abnormity of the opening of the electronic expansion valve by detecting the defrosting temperatures of the two heat exchange systems when the opening of the electronic expansion valve of the outdoor unit of the multi-split system is abnormal, is favorable for timely maintenance, and reduces the maintenance cost; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
The embodiment also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium stores a computer program, and when the computer program is read and executed by the processor, the method for judging the reason of the abnormality of the electronic expansion valve is realized.
The air conditioner of the embodiment can accurately judge the reason of the abnormal opening of the electronic expansion valve by detecting the defrosting temperatures of the two heat exchange systems when the opening of the electronic expansion valve of the outdoor unit of the multi-split air conditioner is abnormal, thereby being beneficial to timely maintenance and reducing the maintenance cost; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method for determining an abnormality cause of an electronic expansion valve is implemented.
The computer-readable storage medium of the embodiment can accurately judge the reason of the abnormal opening of the electronic expansion valve by detecting the defrosting temperatures of the two heat exchange systems when the opening of the electronic expansion valve of the outdoor unit of the multi-split air-conditioning system is abnormal, thereby being beneficial to timely maintenance and reducing the maintenance cost; and the normal heat exchange of the two heat exchange systems can be recovered in time, and the heating capacity is ensured.
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 (12)
1. A method for judging the reason of abnormality of an electronic expansion valve is applied to an outdoor unit comprising two same heat exchange systems, and is characterized by comprising the following steps:
detecting the operating parameters of the two heat exchange systems in a heating mode, and judging whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal or not according to the operating parameters;
if so, detecting a first defrosting temperature and a second defrosting temperature of the two heat exchange systems;
judging the reason of abnormal opening of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature;
the first defrosting temperature and the second defrosting temperature are detected by temperature sensors arranged on heat exchangers of the two heat exchange systems;
the determining the reason for the abnormal opening of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature includes:
determining a difference between the first defrost temperature and the second defrost temperature;
if the value obtained by subtracting the second defrosting temperature from the first defrosting temperature is larger than or equal to a second difference threshold value, judging that the reason of the abnormal opening degree of the electronic expansion valve is wrong and wrong of the electronic expansion valve;
and if the value obtained by subtracting the first defrosting temperature from the second defrosting temperature is greater than or equal to a third difference threshold value, judging that the reason of the abnormal opening degree of the electronic expansion valve is the gas collecting pipe temperature sensing bulb error.
2. The method for determining the cause of the abnormality of the electronic expansion valve according to claim 1, wherein the detecting the operation parameters of the two heat exchange systems in the heating mode, and determining whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal according to the operation parameters comprises:
in the heating mode, detecting the opening degree of a first electronic expansion valve and the opening degree of a second electronic expansion valve of the two heat exchange systems;
and judging whether the opening of the electronic expansion valve is abnormal or not according to the opening of the first electronic expansion valve and the opening of the second electronic expansion valve.
3. The method for determining the cause of the abnormality of the electronic expansion valve according to claim 1, wherein the detecting the operation parameters of the two heat exchange systems in the heating mode, and determining whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal according to the operation parameters comprises:
in the heating mode, detecting the opening degree of a first electronic expansion valve, the opening degree of a second electronic expansion valve, the temperature of a first gas collecting pipe and the temperature of a second gas collecting pipe of the two heat exchange systems;
and judging whether the opening of the electronic expansion valve is abnormal or not according to the opening of the first electronic expansion valve, the opening of the second electronic expansion valve, the temperature of the first gas collecting pipe and the temperature of the second gas collecting pipe.
4. The method for determining the cause of the abnormality of the electronic expansion valve according to claim 3, wherein determining whether the opening degree of the electronic expansion valve is abnormal or not according to the first electronic expansion valve opening degree, the second electronic expansion valve opening degree, the first header temperature, and the second header temperature includes:
judging whether the opening of the first electronic expansion valve reaches the minimum opening or not and whether the opening of the second electronic expansion valve reaches the maximum opening or not;
if yes, judging whether the value obtained by subtracting the first gas collecting tube temperature from the second gas collecting tube temperature is larger than or equal to a first difference threshold value;
and if so, judging that the opening degree of the electronic expansion valve is abnormal.
5. The method for determining the cause of the abnormality in the electronic expansion valve according to claim 4, wherein after determining whether the opening degree of the first electronic expansion valve reaches a minimum opening degree and whether the opening degree of the second electronic expansion valve reaches a maximum opening degree, and if so, before determining whether a value obtained by subtracting the temperature of the first gas collecting pipe from the temperature of the second gas collecting pipe is greater than or equal to a first difference threshold, the method further comprises:
if so, judging whether the duration time that the opening degree of the first electronic expansion valve reaches the minimum opening degree and the opening degree of the second electronic expansion valve reaches the maximum opening degree reaches a first time threshold value.
6. The method for determining the cause of an abnormality in an electronic expansion valve according to any one of claims 1 to 5, further comprising:
and sending out a corresponding fault code according to the abnormal reason.
7. The method for determining the cause of the abnormality in the electronic expansion valve according to claim 4 or 5, wherein the minimum opening degree is in a range of 40-80 pls.
8. The method for determining the cause of the abnormality of the electronic expansion valve according to claim 4 or 5, wherein the first difference threshold value ranges from 5 ℃ to 20 ℃.
9. The method for determining the cause of the abnormality of the electronic expansion valve according to any one of claims 1 to 5, wherein the second difference threshold and the third difference threshold both have a value ranging from 1 ℃ to 10 ℃.
10. An apparatus for determining a cause of an abnormality in an electronic expansion valve, comprising:
the first detection unit (10), the first detection unit (10) is used for detecting the operation parameters of the two heat exchange systems in the heating mode;
the first judging unit (20), the first judging unit (20) is used for judging whether the opening degrees of the electronic expansion valves of the two heat exchange systems are abnormal according to the operation parameters;
the second detection unit (30), the second detection unit (30) is used for detecting the first defrosting temperature and the second defrosting temperature of the two heat exchange systems if the opening degree of the electronic expansion valve is abnormal;
a second judging unit (40), wherein the second judging unit (40) is used for judging the reason of abnormal opening of the electronic expansion valve according to the first defrosting temperature and the second defrosting temperature;
the first defrosting temperature and the second defrosting temperature are detected by temperature sensors arranged on heat exchangers of the two heat exchange systems;
the second judging unit (40) is further configured to judge a difference between the first defrosting temperature and the second defrosting temperature; if the value obtained by subtracting the second defrosting temperature from the first defrosting temperature is larger than or equal to a second difference threshold value, judging that the reason of the abnormal opening degree of the electronic expansion valve is wrong and wrong of the electronic expansion valve; and if the value obtained by subtracting the first defrosting temperature from the second defrosting temperature is greater than or equal to a third difference threshold value, judging that the reason of the abnormal opening degree of the electronic expansion valve is the gas collecting pipe temperature sensing bulb error.
11. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1 to 9.
12. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-9.
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| CN110986269A (en) * | 2019-11-12 | 2020-04-10 | 青岛海尔空调器有限总公司 | Method for detecting and controlling dislocation of expansion valve of multi-split air conditioner under heating working condition |
| CN114251782B (en) * | 2021-12-09 | 2023-02-28 | 珠海格力电器股份有限公司 | Electronic expansion valve abnormality detection method and device and air conditioner |
| CN114738934B (en) * | 2022-03-29 | 2024-05-14 | 青岛海尔空调电子有限公司 | Air conditioner fault detection method and device and air conditioner |
| CN116123325B (en) * | 2023-04-07 | 2023-10-20 | 福建福清核电有限公司 | Method for processing abnormal opening degree of thermal state pilot type safety valve |
| CN117309371B (en) * | 2023-11-30 | 2024-02-23 | 珠海格力电器股份有限公司 | Electronic expansion valve and fan module detection method of water source heat pump unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108613335B (en) * | 2018-03-12 | 2019-12-27 | 珠海格力电器股份有限公司 | Fault detection method and device of air conditioner, storage medium and processor |
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