CN110567095B - Method for detecting and controlling abnormity of electronic expansion valve of multi-connected indoor unit - Google Patents
Method for detecting and controlling abnormity of electronic expansion valve of multi-connected indoor unit Download PDFInfo
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- CN110567095B CN110567095B CN201910777060.7A CN201910777060A CN110567095B CN 110567095 B CN110567095 B CN 110567095B CN 201910777060 A CN201910777060 A CN 201910777060A CN 110567095 B CN110567095 B CN 110567095B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
Abstract
The invention discloses an abnormality detection control method for an electronic expansion valve of a multi-connected indoor unit, which preliminarily identifies the indoor unit with the abnormal electronic expansion valve by judging the coil temperature difference value of the indoor unit in a refrigeration running state and the opening degree of the electronic expansion valve of the indoor unit; after the identified abnormal internal machine is shut down, the electronic expansion valve of the abnormal internal machine performs reset repair, the problem of the electronic expansion valve being stuck is solved, and the internal machine with the electronic expansion valve leaking is further identified through the difference value between each coil pipe of the abnormal internal machine and the ambient temperature; the leakage of the electronic expansion valve is specially controlled, so that the effect influence of the abnormal internal machine on other internal machines is reduced, and the liquid return risk is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for detecting and controlling abnormality of an electronic expansion valve of a multi-connected indoor unit.
Background
The multi-split system is a type of central air conditioner for users, commonly called as 'one split multiple', and refers to a primary refrigerant air conditioning system in which one outdoor unit is connected with two or more indoor units through a pipe, the outdoor side adopts an air cooling heat exchange mode, and the indoor side adopts a direct evaporation heat exchange mode. The multi-split system is widely applied to small and medium-sized buildings and part of public buildings at present.
An electronic expansion valve or other auxiliary loops are required to be arranged in a refrigeration system of the multi-split system so as to adjust the flow of the refrigerant entering the indoor unit. The multi-split air conditioner system is connected with a plurality of indoor units, the electronic expansion valves of the indoor units leak during refrigeration, the refrigeration effect is directly influenced, liquid return is easily caused, at present, each manufacturer has no change method temporarily, and judgment is usually carried out only through the temperature change of a shutdown pipe, so that misjudgment is easily carried out.
Disclosure of Invention
The invention aims to provide an abnormality detection control method for an electronic expansion valve of a multi-connected indoor unit, which aims to solve the technical problem that faults such as leakage of the electronic expansion valve cannot be judged quickly and accurately.
In order to achieve the purpose, the invention adopts the following technical scheme,
a method for detecting and controlling the abnormality of an electronic expansion valve of a multi-connected indoor unit comprises the following steps:
s1, preliminarily identifying the internal machine with the abnormal working state of the electronic expansion valve by judging the coil temperature difference value of the internal machine in the refrigeration running state and the opening degree of the electronic expansion valve;
s2, when the identified abnormal internal machine is stopped, the electronic expansion valve executes reset operation; in the outer machine refrigeration running state and the abnormal inner machine shutdown state, checking the difference value between the coil pipe of the abnormal inner machine and the ambient temperature, and judging whether the electronic expansion valve leaks;
and S3, locking the leaked internal machine of the electronic expansion valve for control.
Preferably, in step S2, when the identified abnormal internal engine is stopped, the electronic expansion valve repeatedly performs a reset operation.
Preferably, in the external machine cooling operation state, the blower of the internal machine leaking from the electronic expansion valve operates in breeze, and the indicator lamp always flashes.
Preferably, step S1 specifically includes: under the refrigeration running state of the external machine, if the running internal machine meets any one of the following conditions, the working state of the electronic expansion valve is judged to be abnormal preliminarily;
condition 11: the temperature T3 of the outlet pipe of the evaporator is less than or equal to 0 when the temperature T1 of the inlet pipe of the evaporator is less than or equal to 0, and the opening of the electronic expansion valve is the minimum opening;
condition 12: the temperature of the outlet pipe of the evaporator T3-the temperature of the inlet pipe of the evaporator T1 is more than or equal to A, and the opening of the electronic expansion valve is the maximum opening.
Further preferably, the value range of the temperature difference A between the outlet pipe of the evaporator and the inlet pipe of the evaporator is 6-10 ℃.
Preferably, in the external machine cooling running state and the abnormal internal machine shutdown state, the abnormal internal machine accumulatively detects a certain time, and if the following conditions are simultaneously met, the leakage of the electronic expansion valve of the abnormal internal machine is judged;
condition 21: the evaporator outlet pipe temperature T3-the ambient temperature T is less than or equal to B;
condition 22: the temperature T2-the ambient temperature T is less than or equal to B in the evaporator.
Further preferably, the temperature difference between the evaporator outlet pipe and the environment and the temperature difference B between the evaporator outlet pipe and the environment range from 10 ℃ to 15 ℃.
Further preferably, in step S2, in the external machine cooling operation state and the abnormal internal machine shutdown state, the abnormal internal machine is detected cumulatively for 10 min.
Preferably, in step S2, if the coil of the abnormal internal machine is detected to be normal in the external machine cooling operation state and the abnormal internal machine shutdown state, the electronic expansion valve executes the reset operation, continues to detect the states of the coil of the abnormal internal machine and the electronic expansion valve after the internal machine is started stably, and gives a corresponding prompt.
Preferably, the electronic expansion valve executes a reset operation, and after the abnormal internal machine is started stably, if the condition 11 is met, the system is judged to be blocked, and the machine set gives an internal machine blocking prompt; if the condition 12 is met, the system is judged to be slightly blocked by impurities or the electronic expansion valve is blocked, and the unit gives an inner machine micro-blocking prompt.
The invention has the following beneficial effects:
the method comprises the steps of preliminarily identifying the abnormal inner machine of the electronic expansion valve by judging the coil temperature difference value of the inner machine in a refrigeration running state and the opening degree of the inner machine electronic expansion valve; after the identified abnormal internal machine is shut down, the electronic expansion valve of the abnormal internal machine performs reset repair, the problem of the electronic expansion valve being stuck is solved, and the internal machine with the electronic expansion valve leaking is further identified through the difference value between each coil pipe of the abnormal internal machine and the ambient temperature; the leakage of the electronic expansion valve is specially controlled, so that the effect influence of the abnormal internal machine on other internal machines is reduced, and the liquid return risk is reduced.
Drawings
Fig. 1 is a flow chart of the method for detecting and controlling the abnormality of the electronic expansion valve of the multi-connected indoor unit.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.
A multi-split air conditioning system generally includes an outdoor unit having a compressor and a condenser, and a plurality of indoor units having an electronic expansion valve, an evaporator, and various temperature sensors. Specifically, the room temperature sensor is located at a suitable position of the indoor unit and used for detecting the indoor environment temperature T; the inlet of the evaporator, the middle part of the evaporator and the outlet of the evaporator are respectively provided with a temperature sensor which is used for respectively detecting the temperature T1 of the inlet pipe of the evaporator, the temperature T2 of the middle pipe of the evaporator and the temperature T3 of the outlet pipe of the evaporator.
Fig. 1 is a flowchart illustrating a method for controlling abnormality detection of an electronic expansion valve of a multi-connected indoor unit according to the present invention.
As shown in fig. 1, in an embodiment of the method for detecting and controlling an abnormality of a multiple indoor unit electronic expansion valve according to the present invention, the method for detecting and controlling an abnormality of a multiple indoor unit electronic expansion valve includes the following steps:
s1, preliminarily identifying the internal machine with the abnormal working state of the electronic expansion valve by judging the coil temperature difference value of the internal machine in the refrigeration running state and the opening degree of the electronic expansion valve;
s2, when the identified abnormal internal machine is stopped, the electronic expansion valve executes reset operation; in the outer machine refrigeration running state and the abnormal inner machine shutdown state, checking the difference value between the coil pipe of the abnormal inner machine and the ambient temperature, and judging whether the electronic expansion valve leaks;
and S3, locking the leaked internal machine of the electronic expansion valve for control.
Specifically, the abnormal internal shutdown includes shutdown during operation and normal shutdown, and does not include shutdown up to temperature.
The method comprises the steps of preliminarily identifying the abnormal inner machine of the electronic expansion valve by judging the coil temperature difference value of the inner machine in a refrigeration running state and the opening degree of the inner machine electronic expansion valve; after the identified abnormal internal machine is shut down, the electronic expansion valve of the abnormal internal machine performs reset repair, the problem of the electronic expansion valve being stuck is solved, and the internal machine with the electronic expansion valve leaking is further identified through the difference value between each coil pipe of the abnormal internal machine and the ambient temperature; the leakage of the electronic expansion valve is specially controlled, so that the effect influence of the abnormal internal machine on other internal machines is reduced, and the liquid return risk is reduced.
In step S2, when the identified abnormal internal machine is stopped, the electronic expansion valve of the abnormal internal machine performs the reset operation 0 → 500 or 2000 → 0, and the reset operation is performed N times, preferably, the electronic expansion valve performs the reset operation 5 times. The electronic expansion valve repeatedly executes the reset operation, so that the problem that the electronic expansion valve of the abnormal internal machine is blocked can be solved.
In step S3, the controlling the internal unit that leaks from the electronic expansion valve specifically includes: in the outer machine refrigeration running state and the inner machine shutdown state of the electronic expansion valve leakage, the blower of the inner machine of the electronic expansion valve leakage runs in breeze, and the indicator lamp always flickers. Through the operation, the effect influence of the abnormal inner machine on other inner machines can be reduced, and the liquid return risk is reduced; the indicating lamp flickers frequently, and the effect of reminding an operator is achieved.
In this embodiment, step S1 specifically includes: under the refrigeration running state of the external machine, if the running internal machine meets any one of the following conditions, the working state of the electronic expansion valve is judged to be abnormal preliminarily;
condition 11: the temperature T3 of the outlet pipe of the evaporator is less than or equal to 0 when the temperature T1 of the inlet pipe of the evaporator is less than or equal to 0, and the opening of the electronic expansion valve is the minimum opening;
condition 12: the temperature of the outlet pipe of the evaporator T3-the temperature of the inlet pipe of the evaporator T1 is more than or equal to A, and the opening of the electronic expansion valve is the maximum opening.
Specifically, different manufacturers set the opening of the electronic expansion valve differently, and the minimum opening of the electronic expansion valve is usually 60 steps, and the maximum opening is 480 steps or 2000 steps.
More specifically, the value range of the temperature difference A between the outlet pipe of the evaporator and the inlet pipe of the evaporator is 6-10 ℃, and 6 ℃ is preferred.
Step S1 is to preliminarily determine the internal unit with the electronic expansion valve abnormal by determining the temperature difference between the evaporator outlet pipe and the evaporator inlet pipe of the internal unit in the cooling operation state and the opening degree of the electronic expansion valve.
In this embodiment, step S2 specifically includes detecting the abnormal indoor unit cumulatively for a certain time in the external refrigeration running state and in the abnormal indoor unit shutdown state, and determining that the electronic expansion valve of the abnormal indoor unit leaks if the following conditions are met;
condition 21: the evaporator outlet pipe temperature T3-the ambient temperature T is less than or equal to B;
condition 22: the temperature T2-the ambient temperature T is less than or equal to B in the evaporator.
Specifically, under the external machine cooling running state and the abnormal internal machine shutdown state, the abnormal internal machine continuously detects for 10min in an accumulative way.
More specifically, the temperature difference between the evaporator outlet pipe and the environment and the temperature difference B between the evaporator outlet pipe and the environment range from 10 ℃ to 15 ℃, and 10 ℃ is preferably selected.
In this embodiment, in step S2, if the coil of the abnormal internal machine is detected normally in the cooling operation state of the external machine and the shutdown state of the abnormal internal machine, the electronic expansion valve executes the reset operation, continues to detect the states of the coil of the abnormal internal machine and the electronic expansion valve after the abnormal internal machine is started stably, and gives a corresponding prompt.
Specifically, the electronic expansion valve executes a reset action, and after the abnormal internal machine is started stably, if a condition 11 is met, the system is judged to be blocked, and the machine set gives an internal machine blocking prompt; the internal machine blockage comprises the situations of electronic expansion valve blockage, filter blockage and the like; if the condition 12 is met, judging that the system is slightly blocked by impurities or the electronic expansion valve is blocked, and giving an inner machine micro-blocking prompt by the unit; because the faults of micro-blockage of the internal machine and blockage of the electronic expansion valve are represented by the evaporator outlet pipe temperature T3-the evaporator inlet pipe temperature T1 is more than or equal to A, the opening degree of the electronic expansion valve is the maximum opening degree, and the blockage of the electronic expansion valve can be solved by repeatedly executing the reset operation, if the condition 12 is met, the machine set gives a prompt of micro-blockage of the internal machine.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The method for detecting and controlling the abnormality of the electronic expansion valve of the multi-connected indoor unit is characterized by comprising the following steps of:
s1, preliminarily identifying the internal machine with the abnormal working state of the electronic expansion valve by judging the temperature difference of a coil of the internal machine in the refrigeration running state and the opening degree of the electronic expansion valve, wherein the temperature difference of the coil is the temperature difference between an outlet pipe of the evaporator and an inlet pipe of the evaporator; the method comprises the following steps: under the refrigeration running state of the external machine, if the running internal machine meets any one of the following conditions, the working state of the electronic expansion valve is judged to be abnormal preliminarily;
condition 11: the temperature T3 of the outlet pipe of the evaporator is less than or equal to 0 when the temperature T1 of the inlet pipe of the evaporator is less than or equal to 0, and the opening of the electronic expansion valve is the minimum opening;
condition 12: the temperature of an outlet pipe of the evaporator T3-the temperature of an inlet pipe of the evaporator T1 is more than or equal to A, and the opening of the electronic expansion valve is the maximum opening;
s2, when the identified abnormal internal machine is stopped, the electronic expansion valve executes reset operation; in the outer machine refrigeration running state and the abnormal inner machine shutdown state, checking the difference value between the coil pipe of the abnormal inner machine and the ambient temperature, and judging whether the electronic expansion valve leaks; the method comprises the following steps: in the outer machine refrigeration running state and the abnormal inner machine shutdown state, the abnormal inner machine accumulatively detects a certain time, and if the following conditions are met, the leakage of the electronic expansion valve of the abnormal inner machine is judged;
condition 21: the evaporator outlet pipe temperature T3-the ambient temperature T is less than or equal to B;
condition 22: the temperature T2-the ambient temperature T in the evaporator is less than or equal to B;
s3, locking an internal machine with electronic expansion valve leakage for control; the method comprises the following steps: and in the outer machine refrigeration running state, the blower of the inner machine leaking from the electronic expansion valve runs in breeze in the inner machine stopping state leaking from the electronic expansion valve.
2. The method for detecting and controlling the abnormality of the multiple indoor unit electronic expansion valve according to claim 1, wherein in step S2, when the identified abnormal indoor unit is stopped, the electronic expansion valve repeatedly performs a reset operation.
3. The method for detecting and controlling the abnormality of the multiple indoor unit electronic expansion valve according to claim 1, wherein step S3 specifically includes:
under the state of external machine refrigeration operation and the state of internal machine shutdown with electronic expansion valve leakage, the indicator lamp always flickers.
4. The abnormality detection control method for the multiple indoor unit electronic expansion valve according to claim 1,
the value range of the temperature difference A between the outlet pipe of the evaporator and the inlet pipe of the evaporator is 6-10 ℃.
5. The abnormality detection control method for the multiple indoor unit electronic expansion valve according to claim 1,
the temperature difference between the evaporator outlet pipe and the environment and the temperature difference B between the evaporator outlet pipe and the environment are within the range of 10-15 ℃.
6. The abnormality detection control method for the multiple indoor unit electronic expansion valve according to claim 1,
in step S2, the abnormal indoor unit is cumulatively detected for 10min in the external machine cooling operation state and the abnormal indoor unit shutdown state.
7. The method for detecting and controlling the abnormality of the electronic expansion valve of a multi-connected indoor unit according to any one of claims 1 to 6,
in step S2, if the coil detection of the abnormal internal machine is normal in the external machine cooling operation state and the abnormal internal machine shutdown state, the electronic expansion valve executes the reset operation, continues to detect the states of the coil and the electronic expansion valve of the abnormal internal machine after the abnormal internal machine is started stably, and gives a corresponding prompt.
8. The abnormality detection control method for the multiple indoor unit electronic expansion valve according to claim 7,
the electronic expansion valve executes reset operation, and after the abnormal internal machine is started stably, if the condition 11 is met, the system is judged to be blocked, and the machine set gives an internal machine blocking prompt; if the condition 12 is met, the system is judged to be slightly blocked by impurities or the electronic expansion valve is blocked, and the unit gives an inner machine micro-blocking prompt.
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| CN111207482B (en) * | 2020-01-07 | 2020-12-29 | 珠海格力电器股份有限公司 | Air conditioner electronic expansion valve clamping adjustment control method and air conditioner |
| CN111457550B (en) * | 2020-04-20 | 2022-01-21 | 宁波奥克斯电气股份有限公司 | Air conditioner refrigerant shortage detection method and device and air conditioner |
| CN112303851B (en) * | 2020-10-29 | 2022-12-27 | 青岛海尔空调电子有限公司 | Control method for air conditioner and air conditioner using same |
| CN113137716B (en) * | 2021-03-25 | 2023-01-31 | 青岛海尔空调电子有限公司 | Expansion valve type identification method for multi-split air conditioning system and multi-split air conditioning system |
| CN113357746B (en) * | 2021-05-18 | 2022-11-18 | 青岛海尔空调器有限总公司 | Electronic expansion valve abnormity detection control method and device, air conditioner and storage medium |
| CN113739340B (en) * | 2021-09-17 | 2022-03-18 | 宁波奥克斯电气股份有限公司 | Multi-split coil pipe temperature self-repairing control method and device, air conditioner and storage medium |
| 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 |
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