CN110567097A - Blockage detection device of air conditioning system filter - Google Patents
Blockage detection device of air conditioning system filter Download PDFInfo
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- CN110567097A CN110567097A CN201910894962.9A CN201910894962A CN110567097A CN 110567097 A CN110567097 A CN 110567097A CN 201910894962 A CN201910894962 A CN 201910894962A CN 110567097 A CN110567097 A CN 110567097A
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- filter
- temperature
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- air conditioning
- conditioning system
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Classifications
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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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/18—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a linear resistance, e.g. platinum resistance thermometer
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a blockage detection device of an air conditioning system filter, and belongs to the technical field of air conditioning system detection. According to the invention, the temperature sensors are arranged on the two sides of the air conditioner filter, whether the filter is blocked is judged according to the temperature difference of the two sides of the air conditioner filter, and the alarm reminding is carried out when the filter is blocked, so that the problems that the filter is blocked and cannot be detected timely or accurately at present are solved. Meanwhile, the temperature change at two ends of the valve is observed by adjusting the opening of the valve on the liquid pipe of the air conditioner filter for experiment to obtain a set temperature threshold value, so that a reliable temperature difference value is provided for judging the filter blockage fault, and the detection accuracy is further improved.
Description
Technical Field
The invention relates to a blockage detection device of an air conditioning system filter, and belongs to the technical field of air conditioning system detection.
Background
A general air conditioning system includes a compressor for compressing a refrigerant, a condenser for condensing the refrigerant compressed by the compressor, a filter for filtering the refrigerant condensed by the condenser, a throttling part for throttling the filtered refrigerant, and an evaporator for evaporating the throttled refrigerant to perform refrigeration. However, when the air conditioner is used, the filter is easily blocked due to improper use, and the normal operation of the air conditioning system is further influenced. At present, the filter is generally detected by touching the temperatures at two sides of the filter by a maintainer after an evaporator is frosted, and judging whether the filter is blocked according to the temperature difference. The method mainly comprises manual touch, is lack of unified standards, has low accuracy, and is totally judged after faults, cannot achieve instant judgment or be found in advance, influences the normal operation of an air conditioning system, and is lack of a temperature difference value which is used for judging whether a filter is in fault or not and can be used for reference in the industry, so that the problem of inaccurate blockage detection is caused.
disclosure of Invention
The invention aims to provide a blockage detection device of an air conditioning system filter, which is used for solving the problems that the blockage detection of the air conditioning system filter is not timely and inaccurate at present.
The invention provides a blockage detection device of an air conditioning system filter, which aims to solve the technical problems and comprises a temperature detection module, a control module and an alarm reminding module, wherein the temperature detection module comprises at least two temperature sensors arranged on two sides of the air conditioning filter, each temperature sensor is connected with the control module, the control module is used for controlling the alarm reminding module according to the temperature difference of the two sides of the air conditioning filter, when the temperature difference of the two sides of the air conditioning filter is greater than a set temperature threshold value, the alarm reminding module is controlled to work, and the set temperature threshold value is obtained by adjusting the opening degree of a valve on a liquid pipe where the air conditioning filter is located for experiment and observing the temperature change of the two ends of the valve.
According to the invention, the temperature sensors are arranged on the two sides of the air conditioner filter, whether the filter is blocked is judged according to the temperature difference of the two sides of the air conditioner filter, and the alarm reminding is carried out when the filter is blocked, so that the problems that the filter is blocked and cannot be detected timely or accurately at present are solved. Meanwhile, the temperature change at two ends of the valve is observed by adjusting the opening of the valve on the liquid pipe of the air conditioner filter for experiment to obtain a set temperature threshold value, so that a reliable temperature difference value is provided for judging the filter blockage fault, and the detection accuracy is further improved.
Further, in order to ensure the accuracy of the set temperature threshold value, and improve the correctness of the filter blockage detection, the determination process of the set temperature threshold value is as follows:
1) a stop valve is arranged on a liquid pipe where the experimental air-conditioning filter is arranged;
2) Adjusting the opening of the stop valve, and judging the temperature difference value of two sides of the stop valve after the set time;
3) And taking the temperature of the branch pipe at the end of the air conditioner evaporator when frosting appears as the set temperature threshold.
Furthermore, in order to realize the detection of the blocking degree of the air conditioner filter, the set temperature threshold comprises at least two levels which respectively correspond to different frosting degrees, and the alarm reminding module carries out graded alarm.
Further, the temperature sensor adopts a thermosensitive probe.
Furthermore, in order to facilitate networking of the detection devices, the control module is connected with a communication module.
Furthermore, in order to visually display the temperature change, the alarm reminding module comprises an LCD segment code display screen.
Furthermore, the temperature detection module is connected with the control module through an AD converter.
Drawings
FIG. 1 is a block diagram of a filter clogging detecting device for an air conditioning system according to the present invention;
Fig. 2 is a flowchart of the operation of the clogging detecting device of the filter of the air conditioning system according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
the blockage detection device of the air conditioning system filter comprises a temperature detection module, a control module and an alarm reminding module, wherein the temperature detection module comprises temperature sensors arranged on two sides of the air conditioning filter, each temperature sensor is connected with the control module, the control module is used for controlling the alarm reminding module according to the temperature difference of the two sides of the air conditioning filter, the alarm reminding module is controlled to work when the temperature difference of the two sides of the air conditioning filter is larger than a set temperature threshold value, and the set temperature threshold value is obtained by adjusting the opening degree of a valve on a liquid pipe where the air conditioning filter is located for experiments to observe the temperature change of the two ends of the valve.
As shown in fig. 1, in terms of hardware, the temperature detection module includes at least two temperature sensors respectively disposed on two sides of the air conditioning system filter, and if more than two temperature sensors, for example, three temperature sensors, two temperature sensors may be disposed on one side of the air conditioning system filter, and one temperature sensor may be disposed on the other side of the air conditioning system filter. In the embodiment, the temperature sensor adopts a PT100 or PT1000 heat-sensitive probe, and the heat-sensitive probe of the type has high temperature measurement precision but needs to be connected with a control module through an AD conversion module; a high-precision digital temperature sensor can also be adopted, namely, the thermosensitive probe and the AD conversion module are integrated, and the temperature sensor does not need to be calibrated at the moment, so that the consistency is higher. The control module adopts MCU, specifically, this embodiment selects MSP430 series singlechip of TI company, the series is 16 bit singlechip, have not little built-in RAM and FLASH, the handling capacity is stronger, the power consumption is especially low at the same time, have 3 low power consumption states, the lowest standby power consumption is 1-2 microamperes.
The alarm reminding module can adopt a mature audible and visual alarm at present, and simultaneously, in order to visually display the detected temperature difference, the alarm reminding module also comprises a display module, the display module adopts an LCD (liquid crystal display) segment code display screen, the power consumption of the display screen is very low, and the standby power consumption is only a few microamperes.
meanwhile, considering that the machine room is large and a large number of air conditioning systems are arranged inside, the control module is connected with a communication module for sending the detected temperature difference to a background so as to realize unified management in order to facilitate the detection of the blockage of each air conditioning system filter in the machine room. The communication module adopts an SI4432 wireless chip, the wireless transmission distance of the chip is longer and called as wall-through king, the power consumption is very low, the standby power consumption reaches about 2 microamperes, the start and stop are very quick, the chip is a wireless transceiver chip with good comprehensive performance, the chip is produced by SiliconLabs company, the chip is an EZRadiopro series wireless transceiver chip with high integration, low power consumption and multiple frequency bands, the receiving sensitivity can reach-117 dB, the excellent link quality can be provided, the maximum output power can reach +20dBm under the condition of not adding a power amplifier, and the wireless chip intermittently works according to a certain time sequence and a response mechanism so as to achieve low power consumption.
Because the power supply voltage of the singlechip, the display module, the AD conversion module and the like is 3.3V, and the power supply voltage of a common high-capacity lithium battery is 3.6V, the LDO chip with low pressure difference and low loss is connected with the lithium battery, so that the voltage is stabilized to be about 3.3V. In view of the low power consumption characteristics of battery powered devices, DCDC power chips are generally not used.
The working process of the blockage detection device of the air conditioning system filter is shown in fig. 2, the control module receives temperature difference data according to a command, when the received temperature difference exceeds a set temperature threshold value, an alarm is given out, the detected temperature difference data is uploaded, and otherwise, the timing dormancy is carried out.
In order to provide a temperature difference value which can be used for reference for judging the blockage of the filter, the temperature difference value is obtained by adjusting the opening degree of a valve on a liquid pipe where the air conditioner filter for experiment is located. The specific process is as follows: the air conditioner with the same model as that of an air conditioning system to be tested is selected as an experimental air conditioner, any air conditioner in a machine room can be selected as the experimental air conditioner, a liquid pipe stop valve is installed on a liquid pipe where an experimental air conditioner filter is located, blockage of the filter in different degrees is simulated by controlling the opening degree of the liquid pipe stop valve, and in order to conveniently and visually observe the opening degree of the liquid pipe stop valve, a 90-degree scale dial plate (0 degree is in a fully-opened state of the valve and 90 degrees is in a fully-closed state of the valve) is installed on the liquid pipe stop valve, and then the temperature difference change of the front end and the rear end (two sides of the filter) of the liquid pipe stop valve is measured.
When the control valve is closed by 20 degrees, the temperature difference between the front end and the rear end does not change obviously after two minutes, five minutes and ten minutes; when the valve is closed by 30 degrees, after two minutes, five minutes and ten minutes, the temperature difference between the front end and the rear end has no obvious change; when the valve is closed by 50 degrees, after two minutes, five minutes and ten minutes, the temperature difference between the front end and the rear end has no obvious change; when the valve is closed by 60 degrees, after two minutes, five minutes and ten minutes, the temperature difference between the front end and the rear end has no obvious change; when the valve is closed at 65 ℃, the front end and the rear end of the temperature difference (the error of the temperature sensor is 0.3 ℃) change by 0.7 ℃ after two minutes, the change is between 0.5 and 0.7 ℃ after five minutes and ten minutes, and slight frosting appears at the branch position of the evaporator end; when the valve is closed by 70 degrees, the front end and the rear end of the temperature difference (the error of the temperature sensor is 0.3 degree) change by 3.1 degrees after two minutes; when the valve is closed by 70 degrees, the front end and the rear end of the temperature difference (the error of the temperature sensor is 0.3 degree) change by 7.7 degrees after five minutes, and the temperature difference is between 6 and 8 degrees after ten minutes, at the moment, the expansion valve frosts, and the branch pipe at the end of the evaporator seriously frosts. From the above adjustment process, it can be seen that when the valve is closed to 65 degrees to 70 degrees, the temperature difference is between 1 degree and 8 degrees, and the clogging of the filter causes the frosting of the rear end evaporator, which affects the cooling effect, so the temperature threshold is set to be between 1 degree and 8 degrees in this embodiment.
According to the setting process of the set temperature threshold, the filter blockage degrees represented by different set temperature thresholds are different, so that the set temperature threshold comprises at least two levels which respectively correspond to different frosting degrees, and the alarm reminding module carries out graded alarm according to the detected temperature difference reaching the set temperature thresholds of different levels. For example, the present embodiment divides the set temperature threshold into three levels, the first level is 1 degree to 2 degrees, the second level is 2 degrees to 6 degrees, and the third level is 6 degrees to 8 degrees, which respectively represent that the degree of clogging of the filter is weak, medium, and strong. When the temperature difference between two sides of the filter is detected to be 1-2 degrees, the filter is indicated to be slightly blocked (weak), when the temperature difference between two sides of the filter is detected to be 2-6 degrees, the filter is indicated to be moderately blocked (medium), and when the temperature difference between two sides of the filter is detected to be 6-8 degrees, the filter is indicated to be severely blocked (strong); the control module carries out different alarm reminding according to the interval where the temperature difference of the two sides of the filter is located.
Claims (7)
1. the utility model provides a jam detection device of air conditioning system filter, its characterized in that, this detection device includes temperature detection module, control module and warning and reminds the module, temperature detection module is including being used for setting up two at least temperature sensor in air conditioner filter both sides, and each temperature sensor links to each other with control module, control module is used for according to the temperature difference control warning of air conditioner filter both sides and reminds the module work, and the control warning reminds the module work when the temperature difference of air conditioner filter both sides is greater than the settlement temperature threshold value, set for the temperature threshold value and observe valve both ends temperature variation through the valve aperture on the adjustment experiment air conditioner filter place liquid pipe.
2. The clogging detecting apparatus of a filter of an air conditioning system according to claim 1, wherein the set temperature threshold value is determined as follows:
1) A stop valve is arranged on a liquid pipe where the experimental air-conditioning filter is arranged;
2) Adjusting the opening of the stop valve, and judging the temperature difference value of two sides of the stop valve after the set time;
3) And taking the temperature of the branch pipe at the end of the air conditioner evaporator when frosting appears as the set temperature threshold.
3. The apparatus as claimed in claim 2, wherein the set temperature threshold comprises at least two levels corresponding to different frosting degrees, and the alarm reminding module performs a graded alarm.
4. The air conditioning system filter clogging detection apparatus as claimed in any one of claims 1 to 3, wherein said temperature sensor employs a heat sensitive probe.
5. The air conditioning system filter clogging detection apparatus of any one of claims 1-3, wherein a communication module is connected to said control module.
6. The air conditioning system filter clogging detection device of any one of claims 1-3, wherein said alarm alert module comprises an LCD segment code display screen.
7. The apparatus as claimed in any one of claims 1 to 3, wherein the temperature detecting module is connected to the control module through an AD converter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910854488 | 2019-09-10 | ||
| CN2019108544887 | 2019-09-10 |
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| CN110567097A true CN110567097A (en) | 2019-12-13 |
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| CN201910894962.9A Pending CN110567097A (en) | 2019-09-10 | 2019-09-20 | Blockage detection device of air conditioning system filter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442929A (en) * | 2020-04-01 | 2020-07-24 | 广西玉柴机器股份有限公司 | Device capable of adjusting and simulating blockage and leakage of EGR cooler |
| CN114236425A (en) * | 2021-11-12 | 2022-03-25 | 潍柴动力股份有限公司 | Method for determining oil filter blockage of filter and related equipment |
| CN115451522A (en) * | 2022-09-28 | 2022-12-09 | 宁波奥克斯电气股份有限公司 | Blockage diagnosis method for bypass valve of air conditioner and air conditioner |
| CN115488112A (en) * | 2022-08-03 | 2022-12-20 | 华能山东发电有限公司白杨河发电厂 | Online flushing method for water-hydrogen generator cooler |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111442929A (en) * | 2020-04-01 | 2020-07-24 | 广西玉柴机器股份有限公司 | Device capable of adjusting and simulating blockage and leakage of EGR cooler |
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| CN115488112A (en) * | 2022-08-03 | 2022-12-20 | 华能山东发电有限公司白杨河发电厂 | Online flushing method for water-hydrogen generator cooler |
| CN115451522A (en) * | 2022-09-28 | 2022-12-09 | 宁波奥克斯电气股份有限公司 | Blockage diagnosis method for bypass valve of air conditioner and air conditioner |
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Application publication date: 20191213 |