CN115451522A - Blockage diagnosis method for bypass valve of air conditioner and air conditioner - Google Patents

Blockage diagnosis method for bypass valve of air conditioner and air conditioner Download PDF

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Publication number
CN115451522A
CN115451522A CN202211190473.3A CN202211190473A CN115451522A CN 115451522 A CN115451522 A CN 115451522A CN 202211190473 A CN202211190473 A CN 202211190473A CN 115451522 A CN115451522 A CN 115451522A
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China
Prior art keywords
bypass valve
air conditioner
pressure
temperature
time
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CN202211190473.3A
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Chinese (zh)
Inventor
邓赛峰
李理科
陈华
刘合心
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Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
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Priority to CN202211190473.3A priority Critical patent/CN115451522A/en
Publication of CN115451522A publication Critical patent/CN115451522A/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature

Abstract

The invention provides a method for diagnosing blockage of a bypass valve of an air conditioner and the air conditioner. The diagnosis method comprises the following steps that a bypass pipeline is connected between the high-pressure side and the low-pressure side of a compressor of the air conditioner, the bypass valve is arranged in the bypass pipeline and used for controlling the opening and closing of the bypass pipeline, and the diagnosis method comprises the following steps: controlling the air conditioner to enter a bypass valve blockage detection mode; acquiring the real-time temperature of the bypass pipeline in the state that the bypass valve is kept closed, and recording the real-time temperature as a first temperature Tp1; opening the bypass valve and keeping the first target time t1 to obtain the real-time temperature of the bypass pipeline, and recording the real-time temperature as a second temperature Tp2; whether the bypass valve is clogged is diagnosed based on the difference Δ t between the first temperature Tp1 and the second temperature Tp2. The invention solves the technical problem that the blockage of the bypass valve of the air conditioner cannot be found in time and causes potential safety hazards, and achieves the technical effect that the air conditioner can diagnose whether the bypass valve is blocked in time by the blockage diagnosis method of the bypass valve of the air conditioner.

Description

Blockage diagnosis method for bypass valve of air conditioner and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method for diagnosing blockage of a bypass valve of an air conditioner and the air conditioner.
Background
Bypass solenoid valves play a crucial role in air conditioning systems. When the air conditioner is operated, the high-pressure and low-pressure functions of the system can be balanced by controlling the opening of the bypass electromagnetic valve, so that the overhigh pressure of the high-pressure side or the overlow pressure of the low-pressure side is prevented, and the operation reliability is improved. Meanwhile, after the air conditioner is shut down, the pressure relief effect is achieved, the system pressure difference can be quickly balanced, and the compressor can be started again.
However, in the actual construction process, there is a problem that: because the two ends of the bypass electromagnetic valve are connected with the high-pressure side pipeline and the low-pressure side pipeline, impurities such as the refrigerant oil can pass through the electromagnetic valve under the action of pressure difference, and the impurities contained in the refrigerant oil can easily cause blockage of the electromagnetic valve, thereby seriously affecting the reliability and stability of the operation of the system.
Whether the bypass electromagnetic valve is blocked is difficult to judge from the appearance, time and labor are wasted through manual troubleshooting, the bypass electromagnetic valve is inconvenient to overhaul and can be blocked in time, and hidden dangers are easily caused.
Disclosure of Invention
The method solves the technical problem that the blockage of the bypass valve of the air conditioner cannot be found in time and causes potential safety hazards, and achieves the technical effect that the air conditioner can diagnose whether the bypass valve is blocked in time through the blockage diagnosis method of the bypass valve of the air conditioner.
In order to solve the above problems, the present invention provides a method for diagnosing blockage of a bypass valve of an air conditioner, in which a bypass line is connected between a high pressure side and a low pressure side of a compressor of the air conditioner, the bypass line is provided with a bypass valve and a throttling element, the bypass valve is used for controlling opening and closing of the bypass line, and the method comprises: controlling the air conditioner to enter a bypass valve blockage detection mode; acquiring the real-time temperature of the bypass pipeline in the state that the bypass valve is kept closed, and recording the real-time temperature as a first temperature Tp1; opening the bypass valve and keeping the first target time t1 to obtain the real-time temperature of the bypass pipeline, and recording the real-time temperature as a second temperature Tp2; from the difference Δ t between the first temperature Tp1 and the second temperature Tp2, it is diagnosed whether the bypass valve is clogged.
Compared with the prior art, the technical scheme has the following technical effects: in the diagnosis process, the air conditioner is controlled to enter a bypass valve blockage detection mode firstly, so that the state of a refrigerant in the air conditioner can meet the detection requirement during detection, the stable implementation of the diagnosis method is ensured, and the accuracy of the diagnosis result is improved. The diagnosis is carried out by the difference value between the real-time temperatures of the bypass pipeline in the two states of opening and closing of the bypass valve, the diagnosis method is easy to implement, the diagnosis method is simple, the parameters are few, and the realizability of the diagnosis process is high. Under the two states of opening and closing of the bypass valve, if the bypass valve is not blocked, the difference of the environmental states in the inner bypass pipeline under the two states is small, for example, the temperature difference is large, and the pressure difference is large; if the bypass valve is blocked, the influence of the opening and closing of the bypass valve on the environment state in the bypass pipeline is large, and whether the bypass valve is blocked or not can be accurately diagnosed by acquiring the temperatures of the two states of the opening and closing of the bypass valve. The temperature parameter is collected as a main comparative parameter in the scheme, and is a universal parameter which is convenient to detect. In the present case, although the comparative temperature is selected, in practice, the temperature parameter can be replaced by the comparative pressure parameter, and the diagnostic method in the present case can be realized as well. The diagnosis method can finally realize the diagnosis of whether the bypass valve is blocked, and the air conditioner can timely diagnose whether the bypass valve is blocked.
In one example of the present invention, diagnosing whether the bypass valve is clogged, based on the difference Δ t between the first temperature Tp1 and the second temperature Tp2, includes: in the case where the difference Δ t is greater than the first temperature threshold, it is diagnosed that the bypass valve is not blocked.
Compared with the prior art, the technical scheme has the following technical effects: by comparing the difference Δ t between the first temperature Tp1 and the second temperature Tp2 with the set first temperature threshold, the comparison result is more accurate than comparing the two temperatures directly.
In one example of the present invention, diagnosing whether the bypass valve is clogged, based on the difference Δ t between the first temperature Tp1 and the second temperature Tp2, includes: and diagnosing whether the bypass valve is blocked according to the high-pressure change value delta Ph of the high-pressure side of the compressor and/or the low-pressure change value delta Pl of the low-pressure side of the compressor under the condition that the difference value delta t is smaller than the first temperature threshold value.
Compared with the prior art, the technical scheme has the following technical effects: and when a more accurate diagnosis result cannot be obtained by comparing the temperature difference delta t with the first temperature threshold, adding a pressure parameter for further diagnosis. In the diagnosis method, the result is obtained by diagnosing through the temperature difference, and further more accurate diagnosis is carried out layer by step through pressure diagnosis, so that the whole diagnosis method is more efficient and accurate.
In one example of the invention, the high-pressure variation Δ Ph is a difference between the high-pressure Ph1 in a state where the bypass valve is kept closed and the high-pressure Ph2 after opening the bypass valve and keeping the first target time t 1; the low pressure change value Δ Pl is a difference between the low pressure Pl1 in the state where the bypass valve is kept closed and the low pressure Pl2 after the bypass valve is opened and kept for the first target time t 1.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the diagnosis is carried out by the pressure change value of the bypass pipeline in the two states of opening and closing of the bypass valve, the diagnosis method is easy to implement, the diagnosis method is simple, the parameters are few, and the realizability of the diagnosis process is high. In the two states of opening and closing the bypass valve, if the bypass valve is not blocked, the difference between the environmental states in the inner bypass pipeline in the two states is smaller; if the bypass valve is blocked, the influence of the opening and closing of the bypass valve on the environment state in the bypass pipeline is large, and whether the bypass valve is blocked or not can be accurately diagnosed by acquiring the pressure change values of the bypass valve in the two states of opening and closing.
In one example of the present invention, diagnosing whether the bypass valve is clogged, based on the pressure variation Δ Ph on the high pressure side of the compressor and/or the pressure variation Δ Pl on the low pressure side of the compressor, includes: diagnosing the bypass valve as not being blocked if the high pressure variation value Δ Ph is greater than the first pressure threshold value, and/or if the pressure variation value Δ Pl is greater than the second pressure threshold value; in the event that the high-pressure change value Δ Ph is less than the first pressure threshold value, and in the event that the pressure change value Δ Pl is less than the second pressure threshold value, a bypass valve blockage is diagnosed.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: the diagnosis is carried out by the pressure difference of the high pressure side or the low pressure side, the comparison with the temperature is more accurate, and the high pressure side and the low pressure side are compared simultaneously during the comparison, so that the condition that the diagnosis is inaccurate caused by the comparison of the values on the high pressure side and the low pressure side is avoided. If only one side is compared, the change of the operation mode of the air conditioner causes the pressure change of one side, and the blockage of the bypass valve cannot be directly explained.
In one example of the present invention, controlling an air conditioner to enter a bypass valve blockage detection mode includes: under the condition that the air conditioner is in a shutdown state, controlling the air conditioner to execute one of a heating mode or a refrigerating mode according to the outer ring temperature, and controlling the air conditioner to enter a bypass valve blockage detection mode; and/or directly controlling the air conditioner to enter a bypass valve blockage detection mode under the condition that the air conditioner is in the starting state.
Compared with the prior art, the technical scheme has the following technical effects: the step can react to the starting or shutdown state of the air conditioner, and the diagnosis method can be realized in a plurality of states of the air conditioner.
In one example of the present invention, controlling an air conditioner to enter a bypass valve blockage detection mode includes: under the condition that the air conditioner is in a starting state, and the real-time high pressure Ph of the high-pressure side of the compressor Real time 1 Greater than the set value Ph of high pressure Let 1 Under the condition of (1), directly controlling the air conditioner to enter a bypass valve blockage detection mode; and/or the real-time low pressure Pl at the low pressure side of the compressor under the condition that the air conditioner is in the starting state Real time 2 Less than the low pressure set point Pl Let 2 Under the condition of (1), directly controlling the air conditioner to enter a bypass valve blockage detection mode; and/or at the air conditionerUnder the condition of starting state and real-time high-pressure temperature Th of high-pressure side of compressor Real time 1 Greater than the set high pressure temperature value Th 1 is provided Under the condition of (3), directly controlling the air conditioner to enter a bypass valve blockage detection mode; and/or real-time low-pressure temperature Th of the low-pressure side of the compressor under the condition that the air conditioner is in the starting state Real time 2 Less than the low-pressure set value Th Let 2 Directly controlling the air conditioner to enter a bypass valve blockage detection mode.
Compared with the prior art, the technical effect achieved by adopting the technical scheme is as follows: when the air conditioner is controlled to enter the bypass valve blockage detection mode, rough judgment can be carried out by detecting the temperature and the pressure of the air conditioner, when the detection values exceed the set values, the possibility of blockage is shown, diagnosis is needed at the moment, and then the air conditioner enters the diagnosis mode.
In one example of the present invention, controlling an air conditioner to enter a bypass valve blockage detection mode includes: controlling the air conditioner to operate for a second target time t2; and controlling the air conditioner to enter a bypass valve blockage detection mode according to the real-time pressure difference value delta Ph-l between the high pressure side of the compressor and the low pressure side of the compressor.
Compared with the prior art, the technical scheme has the following technical effects: the whole negative pressure condition in the air conditioner at the moment can be known according to the magnitude of the real-time pressure difference value delta Ph-l, and when the negative pressure in the air conditioner is low and cannot meet the diagnosis method, the compressor needs to be controlled to increase the frequency.
In one example of the present invention, controlling an air conditioner to enter a bypass valve blockage detection mode based on a real-time pressure difference Δ Ph-l between a high pressure side of a compressor and a low pressure side of the compressor, includes: when the real-time pressure difference value delta Ph-l is smaller than the pressure difference threshold value delta P Threshold(s) Under the condition of (3), controlling the air conditioner to increase the frequency of the compressor; when the real-time pressure difference value delta Ph-l is larger than the pressure difference threshold value delta P Threshold(s) The air conditioner is controlled to keep the compressor frequency unchanged, and the air conditioner is controlled to enter a bypass valve blockage detection mode.
Compared with the prior art, the technical scheme has the following technical effects: the frequency of the compressor is improved, so that the negative pressure in the whole air conditioner is enough, and the diagnosis result obtained by detecting the pressure by a subsequent diagnosis method is more accurate.
In an example of the present invention, there is also provided an air conditioner provided with a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the diagnostic method as in any one of the above embodiments.
Compared with the prior art, the technical scheme has the following technical effects: the air conditioner is provided with the processor and the memory, so that the blockage diagnosis of the bypass valve of the air conditioner can be realized, and the corresponding control method steps are completed.
After the technical scheme of the invention is adopted, the following technical effects can be achieved:
(1) The diagnosis is carried out by the difference value between the real-time temperatures of the bypass pipeline in the two states of opening and closing of the bypass valve, the diagnosis method is easy to implement, the diagnosis method is simple, the parameters are few, and the realizability of the diagnosis process is high. Under the two states of opening and closing of the bypass valve, if the bypass valve is not blocked, the difference of the environmental states in the inner bypass pipeline under the two states is small, for example, the temperature difference is large, and the pressure difference is large; if the bypass valve is blocked, the influence of the opening and closing of the bypass valve on the environment state in the bypass pipeline is large, and whether the bypass valve is blocked or not can be accurately diagnosed by acquiring the temperatures of the bypass valve in the two states of opening and closing;
(2) And when a more accurate diagnosis result cannot be obtained by comparing the temperature difference delta t with the first temperature threshold, adding a pressure parameter for further diagnosis. In the diagnosis method, the result is obtained by diagnosing through the temperature difference, and further more accurate diagnosis is carried out layer by step through pressure diagnosis, so that the whole diagnosis method is more efficient and accurate.
Drawings
Fig. 1 is a flowchart illustrating a method for diagnosing a blockage of a bypass valve of an air conditioner according to the present invention.
Fig. 2 is a flowchart illustrating steps of a diagnostic method according to a fourth embodiment.
Fig. 3 is a schematic structural view of an air conditioner.
Fig. 4 is a block diagram of an air conditioner.
Description of the reference numerals:
100-an air conditioner; 110-a compressor; 120-a gas-liquid separator; 121-a first temperature sensor; 122 — a first pressure sensor; 130-an oil separator; 131-a second temperature sensor; 132-a second pressure sensor; 140-a bypass line; 141-a bypass valve; 142-a capillary tube; 143-a third temperature sensor; 210-a memory; 220-processor.
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.
The first embodiment is as follows:
in a specific embodiment, a method for diagnosing blockage of a bypass valve of an air conditioner is provided, wherein a bypass pipeline is connected between a high pressure side and a low pressure side of a compressor of the air conditioner, a bypass valve and a throttling element are arranged on the bypass pipeline, the bypass valve is used for controlling opening and closing of the bypass pipeline, and the method for diagnosing blockage of the bypass valve of the air conditioner comprises the following steps:
step S100: controlling the air conditioner to enter a bypass valve blockage detection mode;
step S210: acquiring the real-time temperature of the bypass pipeline in the state that the bypass valve is kept closed, and recording the real-time temperature as a first temperature Tp1;
step S220: opening the bypass valve and keeping the first target time t1 to obtain the real-time temperature of the bypass pipeline, and recording the real-time temperature as a second temperature Tp2;
step S300: from the difference Δ t between the first temperature Tp1 and the second temperature Tp2, it is diagnosed whether the bypass valve is clogged.
In the present embodiment, the compressor of the air conditioner has an inlet side of the compressor as a low pressure side and an outlet side of the compressor as a high pressure side according to the circulation of the refrigerant. A bypass line is provided between the high pressure side and the low pressure side of the compressor, and communicates between the high pressure side and the low pressure side. The bypass pipeline is provided with a bypass valve for controlling the pipeline, and the bypass valve controls the opening and closing of the bypass pipeline to realize the control of medium circulation in the bypass pipeline. The specific bypass valve is set as a solenoid valve.
Further, the diagnostic method is used to determine whether the bypass valve is clogged, and when the diagnosis is performed, step S100 is performed first to control the air conditioner to enter a bypass valve clogging detection mode in which a more accurate diagnosis result can be achieved.
Further, after entering the detection mode, the real-time temperature of the bypass valve in two states is obtained. Firstly, acquiring the real-time temperature of a bypass pipeline in a state that a bypass valve is kept closed, wherein the real-time temperature is a first temperature Tp1; and after the acquisition, opening the bypass valve, operating for a first target time, wherein the first target time is about 1-5min, and after the operation is finished, acquiring the real-time temperature of the bypass pipeline, and recording the real-time temperature as a second temperature Tp2. After the real-time temperatures in the two states are obtained, the difference value delta t between the first temperature Tp1 and the second temperature Tp2 is calculated, and whether the bypass valve is blocked or not is further diagnosed according to the size range of the difference value delta t.
In the embodiment, the bypass pipeline has an important function, and when the air conditioner runs, the bypass pipeline can play a role of balancing high pressure and low pressure of the system by controlling the opening of the bypass valve, so that the phenomenon that the pressure of the high-pressure side is too high or the pressure of the low-pressure side is too low is prevented, and the running reliability is improved; meanwhile, after the air conditioner is shut down, the pressure relief effect is achieved, the system pressure difference can be quickly balanced, and the compressor can be started again. In the diagnosis process, the air conditioner is controlled to enter a bypass valve blockage detection mode firstly, so that the state of a refrigerant in the air conditioner can meet the detection requirement in the detection process, the stable implementation of the diagnosis method is ensured, and the accuracy of the diagnosis result is improved. The diagnosis is carried out by the difference value between the real-time temperatures of the bypass pipeline in the two states of opening and closing of the bypass valve, the diagnosis method is easy to implement, the diagnosis method is simple, the parameters are few, and the realizability of the diagnosis process is high. Under the two states of opening and closing of the bypass valve, if the bypass valve is not blocked, the difference of the environmental states in the inner bypass pipeline under the two states is small, for example, the temperature difference is large, and the pressure difference is large; if the bypass valve is blocked, the influence of the opening and closing of the bypass valve on the environment state in the bypass pipeline is large, and whether the bypass valve is blocked or not can be accurately diagnosed by acquiring the temperatures of the two states of the opening and closing of the bypass valve. The temperature parameter is collected as a main comparative parameter in the scheme, and is a universal parameter which is convenient to detect. In the present case, although the comparative temperature is selected, in practice, the temperature parameter can be replaced by the comparative pressure parameter, and the diagnostic method in the present case can be realized as well.
In a specific embodiment, step S300: diagnosing whether the bypass valve is clogged, based on a difference Δ t between the first temperature Tp1 and the second temperature Tp2, includes:
step S310: in the case where the difference Δ t is greater than the first temperature threshold, it is diagnosed that the bypass valve is not blocked.
In this embodiment, when the difference Δ t between the first temperature Tp1 and the second temperature Tp2 is greater than or equal to the first temperature threshold, where the first temperature threshold is preferably 3-10 ℃, it indicates that the bypass line has the refrigerant passing therethrough, the bypass valve is not blocked, and the diagnosis is exited.
In the present embodiment, by comparing the difference Δ t between the first temperature Tp1 and the second temperature Tp2 with the set first temperature threshold, the comparison result is more accurate than directly comparing the two temperatures.
In a specific embodiment, step S300: diagnosing whether the bypass valve is clogged, based on the difference Δ t between the first temperature Tp1 and the second temperature Tp2, includes:
step S320: and diagnosing whether the bypass valve is blocked according to the high-pressure change value delta Ph of the high-pressure side of the compressor and/or the low-pressure change value delta Pl of the low-pressure side of the compressor under the condition that the difference value delta t is smaller than the first temperature threshold value.
In this embodiment, if the difference Δ t is smaller than the first temperature threshold, it may be that the content of the refrigeration oil flowing through the bypass capillary is large, which affects the temperature variation, and in order to improve the determination accuracy, the determination is further performed through step S320.
Further, a pressure parameter is added, and the diagnosis is performed again according to the high pressure change value Δ Ph of the high pressure side of the compressor and/or the low pressure change value Δ Pl of the low pressure side of the compressor. In the case of diagnosing whether plugging is occurring, comparing the pressure parameter is more accurate than comparing the temperature parameter. The pressure change added to the high pressure side or the pressure change of the low pressure side can be diagnosed by the pressure parameter, and therefore, any one of the high pressure side and the low pressure side can be selected.
In this embodiment, when a more accurate diagnosis result cannot be obtained by comparing the temperature difference Δ t with the first temperature threshold, the pressure parameter is added for further diagnosis. In the diagnosis method, the result is obtained by diagnosing through the temperature difference, and further more accurate diagnosis is carried out layer by step through pressure diagnosis, so that the whole diagnosis method is more efficient and accurate.
In a specific embodiment, the high-pressure variation value Δ Ph is a difference between the high-pressure Ph1 in a state where the bypass valve is kept closed and the high-pressure Ph2 after opening the bypass valve and keeping the first target time t 1; the low-pressure change value Δ Pl is a difference between the low-pressure Pl1 in the state where the bypass valve is kept closed and the low-pressure Pl2 after the bypass valve is opened and kept for the first target time t 1.
In the embodiment, in the diagnostic step of comparing pressures in step S320, the high-pressure change value Δ Ph is a difference between the two states of opening and closing the bypass valve, and a difference between the high-pressure Ph1 at which the bypass valve is kept closed and the high-pressure Ph2 at which the bypass valve is opened and kept for the first target time t 1; the low pressure change value Δ Pl is a difference between the two states of opening and closing of the bypass valve, and a difference between the low pressure Pl1 in the state where the bypass valve is kept closed and the low pressure Pl2 after the bypass valve is opened and kept for the first target time t 1. The first target time at this time is about 1-5min, and is the same as the first target time in step S220, and is the same parameter.
In the embodiment, the diagnosis is performed by the pressure change value of the bypass pipeline in two states of opening and closing of the bypass valve, the diagnosis method is easy to implement, the diagnosis method is simple, the parameters are few, and the realizability of the diagnosis process is high. Under the two states of opening and closing of the bypass valve, if the bypass valve is not blocked, the difference of the environmental states in the inner bypass pipeline under the two states is smaller; if the bypass valve is blocked, the influence of the opening and closing of the bypass valve on the environment state in the bypass pipeline is large, and whether the bypass valve is blocked or not can be accurately diagnosed by acquiring the pressure change values of the bypass valve in the two states of opening and closing.
In a specific embodiment, step S320: diagnosing whether the bypass valve is clogged, based on a pressure variation Δ Ph of a high pressure side of the compressor and/or a pressure variation Δ Pl of a low pressure side of the compressor, includes:
step S321: diagnosing the bypass valve as not being blocked if the high pressure variation value Δ Ph is greater than the first pressure threshold value, and/or if the pressure variation value Δ Pl is greater than the second pressure threshold value;
step S322: in the case of a high-pressure change value Δ Ph which is smaller than a first pressure threshold value, and in the case of a pressure change value Δ Pl which is smaller than a second pressure threshold value, a bypass valve blockage is diagnosed.
In this embodiment, in step S321, the first pressure threshold is preferably 5 to 10bar, and the second pressure threshold is preferably 5 to 10bar; when the high-pressure change value delta Ph is larger than the first pressure threshold value or the low-pressure change value delta Pl is larger than the second pressure threshold value, the pressure when the bypass valve is closed is higher than the pressure after the bypass valve is opened, obvious pressure difference exists before and after the bypass valve is opened, the bypass valve can be communicated in a bypass pipeline after the bypass valve is opened, namely the bypass solenoid valve is not blocked, and the diagnosis can be quit. In this step, it can also be diagnosed that the bypass valve is not blocked when the high pressure variation value Δ Ph is equal to the first pressure threshold value or the low pressure variation value Δ Pl is equal to the second pressure threshold value.
Step S322, the first pressure threshold value is preferably 5-10bar, and the second pressure threshold value is preferably 5-10bar; when the high-pressure change value delta Ph is smaller than the first pressure threshold value and the low-pressure change value delta Pl is smaller than the second pressure threshold value, the difference between the pressure when the bypass valve is closed and the pressure after the bypass valve is opened is not large, no obvious pressure difference exists before and after the bypass valve is opened, the bypass pipeline cannot be communicated after the bypass valve is opened, and therefore the bypass electromagnetic valve is blocked. If the comparison result between the high pressure side and the low pressure side is satisfied at the same time, the diagnosis result of the bypass valve clogging can be obtained, and if only one side is taken for comparison, the pressure change may be caused by the change of the operation mode of the air conditioner on one side, and the bypass valve clogging cannot be directly explained.
In the embodiment, the diagnosis is performed by the pressure difference between the high pressure side and the low pressure side, which is more accurate than the comparison temperature, and the high pressure side and the low pressure side are compared at the same time during the comparison, thereby avoiding the condition of inaccurate diagnosis caused by the comparison of the values. If only one side is compared, the change of the operation mode of the air conditioner causes the pressure change of one side, and the blockage of the bypass valve cannot be directly explained.
In a specific embodiment, step S100: controlling an air conditioner to enter a bypass valve blockage detection mode, comprising:
step S110: under the condition that the air conditioner is in a shutdown state, controlling the air conditioner to execute one of a heating mode or a refrigerating mode according to the outer ring temperature, and controlling the air conditioner to enter a bypass valve blockage detection mode; and/or
Step S120: and under the condition that the air conditioner is in a starting state, directly controlling the air conditioner to enter a bypass valve blockage detection mode.
In the present embodiment, in the diagnostic comparison method, as can be seen from the first embodiment, the step S100 is first continued to control the air conditioner to enter the bypass valve blockage detection mode, so as to prevent the diagnostic result from being inaccurate. When the air conditioner is controlled, it is responded whether the air conditioner is turned on or not through steps S110 and S120. When the air conditioner is not started, step S110 is performed, the air conditioner is controlled to operate in a cooling mode or a heating mode according to the outdoor ambient temperature, and the bypass valve blockage detection mode is entered in the operating state of the air conditioner. When the air conditioner is started, the bypass valve blockage detection mode can be directly entered.
In this embodiment, this step can react to the power-on or power-off state of the air conditioner, and it is ensured that the diagnosis method can be implemented in a plurality of states of the air conditioner.
In a specific embodiment, step S100: controlling an air conditioner to enter a bypass valve blockage detection mode, comprising:
step S121: under the condition that the air conditioner is in the starting stateAnd real-time high pressure Ph at the high pressure side of the compressor Real time 1 Greater than the set value Ph of high pressure 1 is provided Under the condition of (1), directly controlling the air conditioner to enter a bypass valve blockage detection mode; and/or
Step S122: under the condition that the air conditioner is in a starting state, and the real-time low-pressure Pl of the low-pressure side of the compressor Real time 2 Less than the low pressure set point Pl Let 2 Under the condition of (3), directly controlling the air conditioner to enter a bypass valve blockage detection mode; and/or
Step S123: under the condition that the air conditioner is in a starting state, and the real-time high-pressure temperature Th of the high-pressure side of the compressor Real time 1 Greater than the set high-pressure temperature value Th Let 1 Under the condition of (3), directly controlling the air conditioner to enter a bypass valve blockage detection mode; and/or
Step S124: under the condition that the air conditioner is in a starting state, and the real-time low-pressure temperature Th of the low-pressure side of the compressor Real time 2 Less than the low-pressure set value Th Let 2 Directly controlling the air conditioner to enter a bypass valve blockage detection mode.
In this embodiment, when the air conditioner is already turned on and running, the real-time pressures and real-time temperatures of the high-pressure side and the low-pressure side of the compressor may be obtained, the obtained parameter information may be compared with the set values, and when the comparison condition is satisfied, the bypass valve blockage detection mode may be triggered to enter.
Real-time high pressure Ph on the high pressure side of the compressor Real time 1 Greater than high pressure set point Ph 1 is provided When the high-pressure of the high-pressure side exceeds the threshold value, the bypass pipeline of the air conditioner is possibly blocked, and the air conditioner is directly controlled to enter a bypass valve blockage detection mode.
Real-time low pressure Pl on the low pressure side of the compressor Real time 2 Less than the low pressure set point Pl Let 2 The condition (2) indicates that the low-pressure at the low-pressure side is lower than the threshold value at the moment, indicates that the bypass pipeline of the air conditioner is possibly blocked, and directly controls the air conditioner to enter a bypass valve blockage detection mode.
Real-time high-pressure temperature Th of high-pressure side of compressor Real time 1 Greater than the set high pressure temperature value Th Let 1 When the high-pressure temperature of the high-pressure side exceeds the threshold value, the bypass pipeline of the air conditioner is possibly blocked, and the air conditioner is directly controlled to enter a bypass valve blockage detection mode.
Real-time low-pressure temperature Th of low-pressure side of compressor Real time 2 Less than the low-pressure set value Th Let 2 When the temperature of the low pressure side exceeds the threshold value, the bypass pipeline of the air conditioner is possibly blocked, and the air conditioner is directly controlled to enter a bypass valve blockage detection mode.
In this embodiment, when the air conditioner is controlled to enter the bypass valve blockage detection mode, a rough determination may be made by detecting the temperature and pressure of the air conditioner, and when both detected values exceed a set value, it is determined that there is a possibility of blockage, and at this time, diagnosis is required, and the air conditioner enters the diagnosis mode.
In a specific embodiment, step S100: controlling the air conditioner to enter a bypass valve blockage detection mode, comprising:
step S131: controlling the air conditioner to operate for a second target time t2;
step S132: and controlling the air conditioner to enter a bypass valve blockage detection mode according to the real-time pressure difference value delta Ph-l between the high pressure side and the low pressure side of the compressor.
In the embodiment, before the diagnosis step is executed, the air conditioner is controlled to operate for two target time t2, after the air conditioner operates for two target time t2, the real-time pressure difference value delta Ph-l between the high-pressure side and the low-pressure side of the compressor is obtained and calculated, and the air conditioner is controlled to enter the bypass valve blockage detection mode according to the real-time pressure difference value delta Ph-l.
In the embodiment, the whole negative pressure condition in the air conditioner at the moment can be known according to the magnitude of the real-time pressure difference value delta Ph-l, and when the negative pressure in the air conditioner is lower and cannot meet the diagnosis method, the compressor needs to be controlled to increase the frequency.
In a specific embodiment, step S132: controlling the air conditioner to enter a bypass valve blockage detection mode according to a real-time pressure difference value delta Ph-l between a high pressure side of the compressor and a low pressure side of the compressor, wherein the method comprises the following steps:
step S1321: when the real-time pressure difference value delta Ph-l is smaller than the pressure difference threshold value delta P Threshold value Under the condition of (3), controlling the air conditioner to increase the frequency of the compressor;
step S1322: when the real-time pressure difference value delta Ph-l is larger than the pressure difference threshold value delta P Threshold(s) The air conditioner is controlled to maintain the compressor frequency constant and to enter a bypass valve blockage detection mode.
In this embodiment, when the real-time pressure difference Δ Ph-l is less than the pressure difference threshold Δ P Threshold(s) When the air conditioner is in a working state, the pressure difference between the high pressure side and the low pressure side of the compressor is not large enough, and the negative pressure of the air conditioner is not enough, the compressor needs to be controlled, and the frequency of the compressor needs to be increased. When the real-time pressure difference value delta Ph-l is larger than the pressure difference threshold value delta P Threshold value It is stated that the compressor frequency is not increased.
In the embodiment, the frequency of the compressor is increased, so that the negative pressure in the whole air conditioner is enough, and the diagnosis result obtained by detecting the pressure by the subsequent diagnosis method is more accurate.
Example two:
in a specific embodiment, referring to fig. 4, there is also provided an air conditioner provided with a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the diagnostic method as in any one of the above embodiments.
In this embodiment, the air conditioner has the processor and the memory, so that the blockage diagnosis of the bypass valve of the air conditioner can be realized, and the corresponding steps of the control method are completed.
Example three:
in a specific embodiment, referring to fig. 3, a gas-liquid separator 120 is connected to the right side of the compressor 110, i.e., the inlet side of the compressor 110, and the side where the gas-liquid separator 120 is located is a low-pressure side, and the refrigerant at the side is a low-temperature and low-pressure refrigerant. A first temperature sensor 121 and a first pressure sensor 122 are provided on the gas-liquid separator 120 side for measuring the temperature and pressure on the low-pressure side.
An oil separator 130 is connected to the left side of the compressor 110, i.e., the outlet side of the compressor 110, the side where the oil-gas separator 130 is located is a high-pressure side, and the refrigerant on this side is a high-temperature and high-pressure refrigerant. A second temperature sensor 131 and a second pressure sensor 132 are provided on the oil separator 130 side for measuring the temperature and pressure on the high-pressure side.
A bypass line 140 is provided between the outlet and the inlet of the compressor 110, and a bypass valve 141 is provided in the bypass line 140 to control the closing of the bypass line 140. The bypass line 140 is further provided with a capillary tube 142 and a third temperature sensor 143, and the third temperature sensor 143 is used for measuring the temperature on the bypass line 140. The capillary tube 142 acts as a throttling element on the bypass line, and can perform a throttling function to change the temperature in the bypass line 140.
Example four:
in one specific embodiment, referring to fig. 2, the whole control procedure flow is as follows:
first, the diagnosis is started in step S11, and after the diagnosis is started, the state of the prototype, that is, whether the air conditioner 100 is turned on or not, is detected in step S12. If it is determined in step S14 that the air conditioner is turned on, step S15 is performed, and if the air conditioner is not operated, step S13 is performed to turn on the operation of the air conditioner 100 according to the outer ring temperature. After the air conditioner 100 is turned on, step S15 is performed to detect the pressure in the air conditioner 100, step S17 is performed to determine whether a sufficient pressure difference is established after the air conditioner 100 is turned on, if so, the next step is performed, and if not, step S16 is performed to control the frequency of the compressor 110 to be increased until the sufficient pressure difference is established.
When the air conditioner 100 has been turned on and a sufficient pressure difference is established, step S18 is performed to detect the temperature of the bypass line 140, the pressures of the high pressure side and the low pressure side in a state where the bypass valve 141 is closed, and obtain a first temperature Tp1, a high pressure Ph1, and a low pressure Pl1; after the detection is finished, the bypass valve 141 is opened, the temperature of the bypass pipeline 140 and the pressure of the high-pressure side and the low-pressure side are continuously detected, and a second temperature Tp2, a high-pressure Ph2 and a low-pressure Pl2 are obtained.
After obtaining the above parameters, step S21 is performed to determine whether the temperature condition is satisfied, that is, whether the bypass valve is clogged is diagnosed according to the difference Δ t between the first temperature Tp1 and the second temperature Tp2. Step S22 is further performed to determine whether the pressure satisfies the change, i.e. to diagnose that the bypass valve is not blocked if the high pressure change value Δ Ph is greater than the first pressure threshold value and/or if the pressure change value Δ Pl is greater than the second pressure threshold value; in the case of a high-pressure change value Δ Ph which is smaller than a first pressure threshold value, and in the case of a pressure change value Δ Pl which is smaller than a second pressure threshold value, a bypass valve blockage is diagnosed.
After the diagnosis result is obtained, the process proceeds to step S25 to end the diagnosis.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A method for diagnosing blockage of a bypass valve of an air conditioner, which is characterized in that a bypass pipeline is connected between a high pressure side and a low pressure side of a compressor of the air conditioner, a bypass valve and a throttling element are arranged on the bypass pipeline, and the bypass valve is used for controlling the opening and closing of the bypass pipeline, and the method comprises the following steps:
controlling the air conditioner to enter a bypass valve blockage detection mode;
acquiring the real-time temperature of the bypass pipeline in the state that the bypass valve is kept closed, and recording the real-time temperature as a first temperature Tp1;
opening the bypass valve and keeping a first target time t1, and acquiring the real-time temperature of the bypass pipeline, and recording as a second temperature Tp2;
diagnosing whether the bypass valve is clogged, based on a difference Δ t between the first temperature Tp1 and the second temperature Tp2.
2. The clogging diagnosis method according to claim 1, wherein said diagnosing whether the bypass valve is clogged, based on a difference Δ t between the first temperature Tp1 and the second temperature Tp2, includes:
diagnosing the bypass valve as not being blocked if the difference Δ t is greater than a first temperature threshold.
3. A clogging diagnosis method according to claim 1, wherein said diagnosing whether or not the bypass valve is clogged, based on a difference Δ t between the first temperature Tp1 and the second temperature Tp2, comprises:
and diagnosing whether the bypass valve is blocked according to the high-pressure change value delta Ph of the high-pressure side of the compressor and/or the low-pressure change value delta Pl of the low-pressure side of the compressor when the difference value delta t is smaller than a first temperature threshold value.
4. The clogging diagnostic method according to claim 3,
the high-pressure change value Δ Ph is a difference between a high-pressure Ph1 in a state where the bypass valve is kept closed and a high-pressure Ph2 after the bypass valve is opened and the first target time t1 is kept;
the low pressure variation value Δ Pl is a difference between a low pressure Pl1 in a state where the bypass valve is kept closed and a low pressure Pl2 after the bypass valve is opened and kept for the first target time t 1.
5. The clogging diagnostic method according to claim 3, wherein said diagnosing whether or not the bypass valve is clogged, based on the pressure variation value Δ Ph on the high pressure side of the compressor and/or the pressure variation value Δ Pl on the low pressure side of the compressor, includes:
diagnosing that the bypass valve is not blocked if the high pressure change value Δ Ph is greater than a first pressure threshold value, and/or if the pressure change value Δ Pl is greater than a second pressure threshold value;
diagnosing the bypass valve as blocked if the high pressure change value Δ Ph is less than the first pressure threshold value and if the pressure change value Δ Pl is less than the second pressure threshold value.
6. The blockage diagnostic method according to any one of claims 1 to 5, wherein controlling the air conditioner to enter a bypass valve blockage detection mode comprises:
under the condition that the air conditioner is in a shutdown state, controlling the air conditioner to execute one of a heating mode or a refrigerating mode according to the outer ring temperature, and controlling the air conditioner to enter a bypass valve blockage detection mode; and/or
And under the condition that the air conditioner is in a starting state, directly controlling the air conditioner to enter a bypass valve blockage detection mode.
7. The blockage diagnostic method according to any one of claims 1 to 5, wherein controlling the air conditioner to enter a bypass valve blockage detection mode comprises:
under the condition that the air conditioner is in a starting state, and the real-time high-pressure Ph of the high-pressure side of the compressor Real time 1 Greater than high pressure set point Ph Let 1 Under the condition of (1), directly controlling the air conditioner to enter the bypass valve blockage detection mode; and/or
When the air conditioner is in the starting state, the real-time low-pressure Pl of the low-pressure side of the compressor Real time 2 Less than the low pressure set point Pl Let 2 Under the condition of (1), directly controlling the air conditioner to enter the bypass valve blockage detection mode; and/or
Under the condition that the air conditioner is in a starting state, and the real-time high-pressure temperature Th of the high-pressure side of the compressor Real time 1 Greater than the set high pressure temperature value Th Let 1 Under the condition of (1), directly controlling the air conditioner to enter the bypass valve blockage detection mode; and/or
Under the condition that the air conditioner is in a starting state, and the real-time low-pressure temperature Th of the low-pressure side of the compressor Real time 2 Less than the low-pressure set value Th Let 2 Directly controlling the air conditioner to enter the bypass valve blockage detection mode.
8. The jam diagnostic method according to any one of claims 1 to 5, wherein the controlling the air conditioner to enter a bypass valve jam detection mode includes:
controlling the air conditioner to operate for a second target time t2;
and controlling the air conditioner to enter a bypass valve blockage detection mode according to the real-time pressure difference value delta Ph-l between the high pressure side of the compressor and the low pressure side of the compressor.
9. The blockage diagnostic method of claim 8, wherein said controlling said air conditioner to enter a bypass valve blockage detection mode based on a real-time pressure difference Δ Ph-l between said compressor high pressure side and said compressor low pressure side comprises:
under the condition that the real-time pressure difference value delta Ph-l is smaller than a pressure difference threshold value delta P threshold, controlling the air conditioner to improve the frequency of a compressor;
and under the condition that the real-time pressure difference value delta Ph-l is larger than the pressure difference threshold value delta P threshold, controlling the air conditioner to keep the frequency of the compressor unchanged, and controlling the air conditioner to enter a bypass valve blockage detection mode.
10. An air conditioner, characterized in that it is provided with a processor, a memory and a program or instructions stored on the memory and executable on the processor, which when executed by the processor implements the diagnostic method according to any one of claims 1 to 9.
CN202211190473.3A 2022-09-28 2022-09-28 Blockage diagnosis method for bypass valve of air conditioner and air conditioner Pending CN115451522A (en)

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JP2010156507A (en) * 2008-12-26 2010-07-15 Daikin Ind Ltd Air conditioner
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CN110567097A (en) * 2019-09-10 2019-12-13 国网河南省电力公司信息通信公司 Blockage detection device of air conditioning system filter
CN113154633A (en) * 2021-03-15 2021-07-23 宁波奥克斯电气股份有限公司 Method and device for judging blockage of air conditioner pipeline component and air conditioner
CN114459119A (en) * 2020-11-10 2022-05-10 广东美的制冷设备有限公司 Air conditioner blockage detection method, device, equipment and storage medium

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100058106A (en) * 2008-11-24 2010-06-03 삼성전자주식회사 Multi-type air conditioner and control method thereof
JP2010156507A (en) * 2008-12-26 2010-07-15 Daikin Ind Ltd Air conditioner
CN109813020A (en) * 2019-02-20 2019-05-28 珠海格力电器股份有限公司 Electric expansion valve choke detecting method, heat pump system control method, electric control method, electric appliance and computer readable storage medium
CN110567097A (en) * 2019-09-10 2019-12-13 国网河南省电力公司信息通信公司 Blockage detection device of air conditioning system filter
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