CN108870644B - Air conditioning system filter blockage detection method and detection device - Google Patents
Air conditioning system filter blockage detection method and detection device Download PDFInfo
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- CN108870644B CN108870644B CN201810490881.8A CN201810490881A CN108870644B CN 108870644 B CN108870644 B CN 108870644B CN 201810490881 A CN201810490881 A CN 201810490881A CN 108870644 B CN108870644 B CN 108870644B
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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
- F24F11/39—Monitoring filter performance
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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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Abstract
The air conditioning system filter clogging detection method of the present invention includes: a temperature detection step of detecting an inlet temperature and an outlet temperature of a filter provided between a throttle member and a condenser in a refrigeration mode; a filter clogging detection step of judging that the filter is clogged according to a difference between the filter inlet temperature and the filter outlet temperature and a trend of the difference in time; and a filter blockage alarming step, wherein the filter blockage alarming step carries out alarm protection according to the filter blockage detected in the filter blockage detecting step. According to the embodiment of the invention, the filter blockage in the air conditioning system can be found as early as possible, the air conditioning system is protected in advance, the compressor damage caused by slow blockage of the filter is avoided, the judgment of the existing node and the judgment of the trend are carried out on the filter blockage detection, the misoperation caused by the judgment of the node is avoided, and the judgment precision is improved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a device for detecting blockage of a filter of an air conditioning system.
Background
During production of the air conditioning system, for example, during welding of the pipeline, scale is generated, and the scale can continuously accumulate at the filter in front of the throttling part along with the operation of the air conditioning system, and if the scale is excessive, the filter can be finally blocked.
In addition, in the use process of the air conditioning system, the liquid return operation of the compressor can occur when the air conditioning system is not used properly, and the liquid refrigerant which flows back to the compressor can dilute the lubricating oil of the compressor, so that the moving parts of the compressor can not be well lubricated and are abraded. Metal impurities generated by the abrasion of internal parts of the compressor are continuously accumulated at the filter between the throttling parts along with the flowing of the refrigerant, and finally, the filter is blocked.
The filter blockage in the application scene is a slow process, and particularly under the working condition of low-temperature operation, a series of related designs such as anti-freezing protection of a unit, exhaust temperature protection of a compressor, overcurrent protection of the compressor and the like lose protection effects. Therefore, if the filter cannot be effectively monitored in the initial stage of the blockage process, the compressor can be stopped repeatedly due to low-pressure protection until the filter is almost completely blocked, so that the compressor cannot be used normally. However, cleaning the system, replacing the compressor, and recharging the refrigerant can incur significant maintenance costs.
Disclosure of Invention
Embodiments of the present invention aim to address, at least to some extent, one of the technical problems in the related art. Therefore, an object of the embodiments of the present invention is to provide a method and a device for detecting filter clogging in an air conditioning system, which can detect filter clogging in the air conditioning system as soon as possible, protect the air conditioning system in advance, avoid damage to a compressor due to slow filter clogging, and detect filter clogging by using both node judgment and trend judgment, avoid malfunction caused by node judgment, and improve judgment accuracy.
In order to achieve the above object, an embodiment of the present invention provides a method for detecting clogging of a filter of an air conditioning system, where the air conditioning system includes: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttling part, the air conditioning system filter clogging detection method comprising: a temperature detection step: the temperature detection step detects the inlet temperature and the outlet temperature of the filter in a refrigeration mode; a filter clogging detection step of judging that the filter is clogged according to a difference between the filter inlet temperature and the filter outlet temperature and a trend of the difference in time; and a filter blockage alarming step, wherein the filter blockage alarming step carries out alarm protection according to the filter blockage detected in the filter blockage detecting step.
According to one embodiment of the present invention, the filter clogging is judged according to the difference between the filter inlet temperature and the filter outlet temperature and the trend of the difference over time as follows: when the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a first threshold value and lasts for a first time, further judging whether the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a second threshold value; if the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a second threshold value and lasts for a second time, further judging whether the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a third threshold value; and judging that the filter is blocked when the difference value between the inlet temperature of the filter and the outlet temperature of the filter is greater than or equal to a third threshold value, wherein the first threshold value is less than or equal to a second threshold value, and the second threshold value is less than or equal to the third threshold value.
According to one embodiment of the invention, the alarm protection is an air conditioning system shutdown operation
In order to achieve the above object, an embodiment of another aspect of the present invention provides a method for detecting clogging of a filter of an air conditioning system, where the air conditioning system includes: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttling part, the air conditioning system filter clogging detection method comprising: a temperature detection step: the temperature detection step detects the ambient temperature and the filter outlet temperature in a refrigeration mode; a filter clogging detection step of judging that the filter is clogged based on a difference between the ambient temperature and the filter outlet temperature and a trend of the difference in time; a filter clogging alarm step of performing alarm protection according to the filter clogging detected in the filter clogging detection step.
According to an embodiment of the present invention, the filter clogging is judged according to the difference between the ambient temperature and the filter outlet temperature and the trend of the difference over time as follows: when the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a fourth threshold value and lasts for a third time, further judging whether the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a fifth threshold value; if the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a fifth threshold value and lasts for a fourth time, further judging whether the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a sixth threshold value; and judging that the filter is blocked when the difference value between the ambient temperature and the outlet temperature of the filter is greater than or equal to a sixth threshold value, wherein the fourth threshold value is less than or equal to a fifth threshold value, and the fifth threshold value is less than or equal to the sixth threshold value.
According to one embodiment of the invention, the alarm protection is an air conditioning system shutdown operation
In order to achieve the above object, according to another embodiment of the present invention, an air conditioning system filter clogging detection apparatus is provided, the air conditioning system including: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttle member; a temperature detection unit: the temperature detection unit detects the inlet temperature and the outlet temperature of the filter in a refrigeration mode; the filter blockage detection unit is connected with the temperature detection unit and judges that the filter is blocked according to the difference value between the inlet temperature and the outlet temperature of the filter and the trend of the difference value along with the change of time; and the filter blockage alarm unit is connected with the filter blockage detection unit and carries out alarm protection according to the filter blockage detected by the filter blockage detection unit.
According to one embodiment of the present invention, the filter clogging is judged according to the difference between the filter inlet temperature and the filter outlet temperature and the trend of the difference over time as follows: when the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a first threshold value and lasts for a first time, further judging whether the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a second threshold value; if the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a second threshold value and lasts for a second time, further judging whether the difference value between the filter inlet temperature and the filter outlet temperature is greater than or equal to a third threshold value; and judging that the filter is blocked when the difference value between the inlet temperature of the filter and the outlet temperature of the filter is greater than or equal to a third threshold value, wherein the first threshold value is less than or equal to a second threshold value, and the second threshold value is less than or equal to the third threshold value.
In order to achieve the above object, according to another embodiment of the present invention, an air conditioning system filter clogging detection apparatus is provided, the air conditioning system including: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttle member; a temperature detection unit: the temperature detection unit detects the ambient temperature and the outlet temperature of the filter in a refrigeration mode; the filter blockage detection unit is connected with the temperature detection unit and judges that the filter is blocked according to the difference value between the ambient temperature and the temperature at the outlet of the filter and the trend of the difference value along with the change of time; and the filter blockage alarm unit is connected with the filter blockage detection unit and carries out alarm protection according to the filter blockage detected by the filter blockage detection unit.
According to an embodiment of the present invention, the filter clogging is judged according to the difference between the ambient temperature and the filter outlet temperature and the trend of the difference over time as follows: when the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a fourth threshold value and lasts for a third time, further judging whether the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a fifth threshold value; if the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a fifth threshold value and lasts for a fourth time, further judging whether the difference value between the ambient temperature and the filter outlet temperature is greater than or equal to a sixth threshold value; and judging that the filter is blocked when the difference value between the ambient temperature and the outlet temperature of the filter is greater than or equal to a sixth threshold value, wherein the fourth threshold value is less than or equal to a fifth threshold value, and the fifth threshold value is less than or equal to the sixth threshold value.
Therefore, according to the air conditioning system filter blockage detection method and the detection device provided by the embodiment of the invention, the filter blockage in the air conditioning system can be found as early as possible, the air conditioning system is protected in advance, the damage of the compressor caused by slow blockage of the filter is avoided, the filter blockage detection has the judgment of the existing node and the trend, the misoperation caused by the judgment of the node is avoided, and the judgment accuracy is improved.
Drawings
Fig. 1 is a schematic diagram showing a configuration of an air conditioning system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a first embodiment of a filter plugging detection device of the air conditioning system of FIG. 1;
FIG. 3 is a block diagram of a second embodiment of a filter plugging detection device of the air conditioning system of FIG. 1;
fig. 4 is a flowchart illustrating a first embodiment of a method for detecting clogging of a filter of an air conditioning system according to an embodiment of the present invention;
fig. 5 is a flowchart showing a second embodiment of a method for detecting clogging of a filter of an air conditioning system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a method and a device for detecting clogging of a filter of an air conditioning system according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a schematic diagram showing a configuration of an air conditioning system 100 according to the present invention. As shown in fig. 1, the air conditioning system 100 of the present invention includes a compressor 1, a condenser 2, a filter 3, a throttle part 4, an evaporator 5, and a controller 9. A compressor 1 that compresses a refrigerant; a condenser 2 that condenses the refrigerant compressed by the compressor 1; a filter 3 for filtering the refrigerant condensed by the condenser 2; a throttle member 4 that throttles the refrigerant filtered by the filter 3; and an evaporator 5 that evaporates the refrigerant throttled by the throttle 4. The above-described devices of the air conditioning system 100 are connected in sequence via refrigerant pipes, and constitute a refrigerant circuit of the air conditioning system 100. The compressor 1 and the throttle unit 4 are connected to an air conditioner controller 9, and receive a control signal from the air conditioner controller 8 to be controlled as indicated by bold arrows in the figure.
In the air conditioning system 100, in the cooling mode, the refrigerant is compressed by the compressor 1 to be changed into a high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is condensed in the condenser 2 to be changed into a liquid refrigerant, the liquid refrigerant condensed by the condenser 2 is filtered in the filter 3 to prevent impurities from entering the throttling component 4 with a small inner pore size to block the throttling component 4, the filtered liquid refrigerant is changed into a low-temperature low-pressure gas-liquid two-phase refrigerant through the throttling component 4, the gas-liquid two-phase refrigerant enters the evaporator 5 to be evaporated and absorb heat of indoor air, and therefore the indoor air is cooled to achieve cooling. The low-temperature low-pressure superheated gas refrigerant that has evaporated and absorbed heat in the evaporator 5 is sucked into the compressor 1, and the low-temperature low-pressure superheated gas refrigerant is compressed again in the compressor 1, and the above cycle is repeated to perform cooling.
In addition, the air conditioning system 100 according to the embodiment of the present invention further includes an air conditioning system filter clogging detection device 10, and the air conditioning system filter clogging detection device 10 is connected to the air conditioning controller 9, the filter inlet temperature sensor 7, and the filter outlet temperature sensor 8, receives temperature signals from the filter inlet temperature sensor 7 and the filter outlet temperature sensor 8, and outputs a filter clogging control signal to the air conditioning controller 9. The filter inlet temperature sensor 7 is provided in a connection pipe between the condenser 2 and the filter 3, and the filter outlet temperature sensor 8 is provided in a connection pipe between the filter 3 and the throttle member 4.
As another example of the air conditioning system filter clogging detection device 10, the air conditioning system filter clogging detection device 10 is connected to the air conditioning controller 9, the filter outlet temperature sensor 8, and the ambient temperature sensor 6, receives temperature signals from the filter outlet temperature sensor 8 and the ambient temperature sensor 6, and outputs a filter clogging control signal to the air conditioning controller 9. Wherein, the filter outlet temperature sensor 8 is arranged on the connecting pipe between the filter 3 and the throttling component 4, and the environment temperature sensor 6 is arranged at the air inlet of the condenser 2 or on the surface thereof.
Fig. 2 is a block diagram of the first embodiment of the filter clogging detection apparatus 10 of the air conditioning system in fig. 1. As shown in fig. 2, the air conditioning system filter clogging detection apparatus 10 includes a temperature detection unit 110, a filter clogging detection unit 120, and a filter clogging alarm unit 130. The temperature detection unit 110 receives temperature signals from the filter inlet temperature sensor 7 and the filter outlet temperature sensor 8 to detect the filter inlet temperature T1 and the filter outlet temperature T2. The filter clogging detecting unit 120 is connected to the temperature detecting unit 110, receives the filter inlet temperature T1 and the filter outlet temperature T2 from the temperature detecting unit 110, and judges the filter clogging according to a difference between the filter inlet temperature T1 and the filter outlet temperature T2 and a trend of the difference with time. The filter clogging alarm unit 130 is connected to the filter clogging detection unit 120, performs alarm protection based on the filter clogging detected by the filter clogging detection unit 120, and outputs the alarm protection to the controller 9.
The above-mentioned filter clogging judgment according to the difference between the filter inlet temperature T1 and the filter outlet temperature T2 and the trend of the difference over time specifically includes: when the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the first threshold value A and lasts for a first time T1, further judging whether the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to a second threshold value B; if the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the second threshold B for a second time T2, further determining whether the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to a third threshold C; and judging that the filter is blocked when the difference value between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to a third threshold value C, wherein the first threshold value A is less than or equal to a second threshold value B, and the second threshold value B is less than or equal to the third threshold value C.
In one embodiment of the present invention, the alarm protection may be an air conditioning system shutdown, but in other embodiments of the present invention, other alarm protection may also be adopted, for example, sending a notification to a user, or giving an early warning with light or voice.
Fig. 3 is a block diagram of a second embodiment of the filter clogging detection device 10 of the air conditioning system of fig. 1. As shown in fig. 3, the air conditioning system filter clogging detection apparatus 10 includes a temperature detection unit 210, a filter clogging detection unit 220, and a filter clogging alarm unit 230. The temperature detection unit 210 receives temperature signals from the ambient temperature sensor 6 and the filter outlet temperature sensor 8 to detect the ambient temperature T3 and the filter outlet temperature T2. The filter clogging detecting unit 220 is connected to the temperature detecting unit 210, receives the ambient temperature T3 and the filter outlet temperature T2 from the temperature detecting unit 210, and judges the filter clogging according to a difference between the ambient temperature T3 and the filter outlet temperature T2 and a trend of the difference with time. The filter clogging alarm unit 230 is connected to the filter clogging detection unit 220, performs alarm protection based on the filter clogging detected by the filter clogging detection unit 220, and outputs the alarm protection to the controller 9.
The filter clogging is judged according to the difference between the ambient temperature T3 and the filter outlet temperature T2 and the trend of the difference along with the change of time as follows: when the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the fourth threshold E for the third time T3, further determining whether the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to a fifth threshold F; if the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the fifth threshold value F for a fourth time T4, further judging whether the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to a sixth threshold value G; and judging that the filter is blocked when the difference value between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to a sixth threshold G, wherein the fourth threshold E is less than or equal to a fifth threshold F, and the fifth threshold F is less than or equal to the sixth threshold G.
The alarm protection is the shutdown of the air conditioning system.
Fig. 4 is a flowchart showing a first embodiment of a method for detecting clogging of a filter of an air conditioning system according to the present invention. As shown in fig. 4, after the air conditioning system filter clogging detection is started, first, in step S1, in the cooling mode, the filter inlet temperature T1 and the filter outlet temperature T2 are detected by the temperature detection unit 110 using the filter inlet temperature sensor 7 and the filter outlet temperature sensor 8.
In the next step S2, it is determined whether the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the first threshold a, if so, step S3 is performed, otherwise, step S1 is continued.
In step S3, after the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the first threshold a for a first time T1, it is further determined whether the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the second threshold B, if yes, step S4 is performed, otherwise, step S1 is continuously performed.
In step S4, if the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the second threshold B for a second time T2, it is further determined whether the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the third threshold C, if yes, step S5 is executed, otherwise, step S3 is executed again.
In step S5, when the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than or equal to the third threshold value C, it is determined that the filter is clogged, and the filter clogging alarm unit 130 performs alarm protection. In the above steps, the first threshold a is less than or equal to the second threshold B, and the second threshold B is less than or equal to the third threshold C.
Specifically, the alarm protection is an air conditioning system shutdown.
In the above flowchart, step S1 corresponds to the temperature detection step of the present invention, which detects the filter inlet temperature T1 and the filter outlet temperature T2 in the cooling mode. Steps S2 to S4 correspond to a filter clogging detection step of the present invention which judges filter clogging based on the difference between the filter inlet temperature T1 and the filter outlet temperature T2 and the tendency of the difference to change with time. Step S5 corresponds to the filter clogging alarm step of the present invention, which performs alarm protection based on the filter clogging detected in the filter clogging detection step.
According to the structure, when the difference value between the filter inlet temperature T1 and the filter outlet temperature T2 is at the value A and below, and the value A is an initial value when the product normally runs, the system is judged to normally run. And when the difference value between the filter inlet temperature T1 and the filter outlet temperature T2 does not exceed the value B, the value B is a fault-tolerant assignment, and the system is judged to be slightly blocked and belongs to the tolerable blocking degree. The setting of this judgment condition can be sufficiently compatible with the generation of false alarm due to slight clogging caused by fluctuation of the welding level. When the difference between the filter inlet temperature T1 and the filter outlet temperature T2 is greater than the C value, which is a decision value beyond the safe operation of the system, the system is immediately shut down and a filter clogging protection code is displayed. Therefore, the filter blockage in the air conditioning system can be found as early as possible, the air conditioning system is protected in advance, the compressor damage caused by slow blockage of the filter is avoided, judgment of existing nodes and judgment of trends of filter blockage detection can be effectively avoided, and misjudgment possibly caused by judgment of a single node can be effectively avoided.
Fig. 5 is a flowchart showing a second embodiment of the method for detecting clogging of a filter in an air conditioning system according to the present invention. As shown in fig. 5, after the air conditioning system filter clogging detection is started, first, in step S1', in the cooling mode, the ambient temperature T3 and the filter outlet temperature T2 are detected by the temperature detection unit 210 using the ambient temperature sensor 6 and the filter outlet temperature sensor 8.
In the next step S2 ', it is determined that the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the fourth threshold E, if so, step S3 ' is performed, otherwise, step S1 ' is continued.
In step S3 ', after the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the fourth threshold E for the third time T3, it is further determined whether the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the fifth threshold F, if so, step S4 ' is performed, otherwise, step S1 ' is continuously performed.
In step S4 ', if the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the fifth threshold F for a fourth time T4, it is further determined whether the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the sixth threshold G, if so, step S5 ' is performed, otherwise, step S3 ' is performed.
In step S5 ', when the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than or equal to the sixth threshold G, it is determined that the filter is clogged, and the filter clogging alarm unit 230' performs alarm protection. In the above step, the fourth threshold E is less than or equal to the fifth threshold F, and the fifth threshold F is less than or equal to the sixth threshold G.
Specifically, the alarm protection is an air conditioning system shutdown.
In the above flowchart, step S1' corresponds to the temperature detection step of the present invention, which detects the ambient temperature T3 and the filter outlet temperature T2 in the cooling mode. Steps S2 '-S4' correspond to a filter clogging detection step of the present invention, which judges filter clogging based on a difference between the ambient temperature T3 and the filter outlet temperature T2 and a trend of the difference with time. Step S5' corresponds to the filter clogging alarm step of the present invention, which performs alarm protection based on the filter clogging detected in the filter clogging detection step.
According to the structure, when the difference value between the ambient temperature T3 and the filter outlet temperature T2 is equal to or less than the value E, and the value E is an initial value when the product normally runs, the system is judged to normally run. And when the difference value between the ambient temperature T3 and the filter outlet temperature T2 does not exceed the value F, the value F is a fault-tolerant assignment, and the system is judged to be slightly blocked and belongs to the tolerable blocking degree. The setting of this judgment condition can be sufficiently compatible with the generation of false alarm due to slight clogging caused by fluctuation of the welding level. When the difference between the ambient temperature T3 and the filter outlet temperature T2 is greater than a value G, which is a decision value beyond which the system is safe to operate, the system is immediately shut down and a filter plugging protection code is displayed.
Therefore, according to the air conditioning system filter blockage detection method and the detection device provided by the embodiment of the invention, the filter blockage in the air conditioning system can be found as early as possible, the air conditioning system is protected in advance, the damage of the compressor caused by slow blockage of the filter is avoided, the filter blockage detection has the judgment of the existing node and the trend, the misoperation caused by the judgment of the node is avoided, and the judgment accuracy is improved.
Claims (6)
1. An air conditioning system filter clogging detection method, the air conditioning system comprising: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttle member, comprising:
a temperature detection step: the temperature detection step detects the inlet temperature and the outlet temperature of the filter in a refrigeration mode;
a filter clogging detection step of judging the filter clogging according to a difference between the filter inlet temperature and the filter outlet temperature and a trend of the difference in time, wherein when the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to a first threshold value and continues for a first time, it is further judged whether the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to a second threshold value, if the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to the second threshold value and continues for a second time, it is further judged whether the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to a third threshold value, and when the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to the third threshold value, it is judged that the filter is clogged, the first threshold is less than or equal to a second threshold, the second threshold is less than or equal to a third threshold, the first threshold is an initial assignment when the air-conditioning system operates normally, the second threshold is a fault-tolerant assignment when the air-conditioning system is slightly blocked, and the third threshold is a judgment assignment when the air-conditioning system exceeds safe operation;
and a filter blockage alarming step, wherein the filter blockage alarming step carries out alarm protection according to the filter blockage detected in the filter blockage detecting step.
2. The air conditioning system filter clogging detection method of claim 1,
the alarm protection is the shutdown operation of the air conditioning system.
3. An air conditioning system filter clogging detection method, the air conditioning system comprising: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttle member, comprising:
a temperature detection step: the temperature detection step detects the ambient temperature and the filter outlet temperature in a refrigeration mode;
a filter clogging detection step of judging that the filter is clogged on the basis of a difference between the ambient temperature and the filter outlet temperature and a tendency of the difference to change with time, wherein, when the difference between the ambient temperature and the filter outlet temperature is greater than or equal to a fourth threshold value and continues for a third time, it is further judged whether the difference between the ambient temperature and the filter outlet temperature is greater than or equal to a fifth threshold value, and if the difference between the ambient temperature and the filter outlet temperature is greater than or equal to a fifth threshold value and continues for the fourth time, it is further judged whether the difference between the ambient temperature and the filter outlet temperature is greater than or equal to a sixth threshold value, and when the difference between the ambient temperature and the filter outlet temperature is greater than or equal to the sixth threshold value, it is judged that the filter is clogged, wherein the fourth threshold value is less than or equal to the fifth threshold value, a fifth threshold is less than or equal to a sixth threshold, the fourth threshold is an initial assignment when the air-conditioning system operates normally, the fifth threshold is a fault-tolerant assignment when the air-conditioning system is slightly blocked, and the sixth threshold is a judgment assignment when the air-conditioning system exceeds safe operation;
a filter clogging alarm step of performing alarm protection according to the filter clogging detected in the filter clogging detection step.
4. The air conditioning system filter clogging detection method of claim 3,
the alarm protection is the shutdown operation of the air conditioning system.
5. An air conditioning system filter clogging detection apparatus, the air conditioning system comprising: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttle member, comprising:
a temperature detection unit: the temperature detection unit detects the inlet temperature and the outlet temperature of the filter in a refrigeration mode;
a filter clogging detection unit connected to the temperature detection unit, for determining the filter clogging according to a difference between the filter inlet temperature and the filter outlet temperature and a trend of the difference in time, wherein when the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to a first threshold value and lasts for a first time, it is further determined whether the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to a second threshold value, if the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to the second threshold value and lasts for a second time, it is further determined whether the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to a third threshold value, and when the difference between the filter inlet temperature and the filter outlet temperature is greater than or equal to the third threshold value, it is determined that the filter is clogged, the first threshold is less than or equal to a second threshold, the second threshold is less than or equal to a third threshold, the first threshold is an initial assignment when the air-conditioning system operates normally, the second threshold is a fault-tolerant assignment when the air-conditioning system is slightly blocked, and the third threshold is a judgment assignment when the air-conditioning system exceeds safe operation;
and the filter blockage alarm unit is connected with the filter blockage detection unit and carries out alarm protection according to the filter blockage detected by the filter blockage detection unit.
6. An air conditioning system filter clogging detection apparatus, the air conditioning system comprising: a compressor that compresses a refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a filter filtering the refrigerant condensed by the condenser; a throttle member that throttles the refrigerant filtered by the filter; an evaporator that evaporates the refrigerant throttled by the throttle member, comprising:
a temperature detection unit: the temperature detection unit detects the ambient temperature and the outlet temperature of the filter in a refrigeration mode;
a filter clogging detection unit connected to the temperature detection unit, and determining that the filter is clogged according to a difference between the ambient temperature and the filter outlet temperature and a trend of the difference in time, wherein when the difference between the ambient temperature and the filter outlet temperature is greater than or equal to a fourth threshold and lasts for a third time, it is further determined whether the difference between the ambient temperature and the filter outlet temperature is greater than or equal to a fifth threshold, and if the difference between the ambient temperature and the filter outlet temperature is greater than or equal to the fifth threshold and lasts for the fourth time, it is further determined whether the difference between the ambient temperature and the filter outlet temperature is greater than or equal to a sixth threshold, and when the difference between the ambient temperature and the filter outlet temperature is greater than or equal to the sixth threshold, it is determined that the filter is clogged, the fourth threshold is less than or equal to a fifth threshold, the fifth threshold is less than or equal to a sixth threshold, the fourth threshold is an initial assignment when the air-conditioning system operates normally, the fifth threshold is a fault-tolerant assignment when the air-conditioning system is slightly blocked, and the sixth threshold is a judgment assignment when the air-conditioning system exceeds safe operation;
and the filter blockage alarm unit is connected with the filter blockage detection unit and carries out alarm protection according to the filter blockage detected by the filter blockage detection unit.
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| CN109737654B (en) * | 2018-12-11 | 2024-01-23 | 珠海格力电器股份有限公司 | Blocking detection method and unit capable of detecting blocking |
| CN109869952A (en) * | 2018-12-24 | 2019-06-11 | 珠海格力电器股份有限公司 | A kind of air-conditioning system and its blowdown control method |
| 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 |
| CN112556090B (en) * | 2020-12-11 | 2022-07-08 | 四川长虹空调有限公司 | Method for detecting blockage of air conditioning system |
| CN113154633B (en) * | 2021-03-15 | 2022-04-19 | 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 |
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