CN117368409A - Method and equipment for detecting reliability of sensor of combustible refrigerant - Google Patents
Method and equipment for detecting reliability of sensor of combustible refrigerant Download PDFInfo
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- CN117368409A CN117368409A CN202311230607.4A CN202311230607A CN117368409A CN 117368409 A CN117368409 A CN 117368409A CN 202311230607 A CN202311230607 A CN 202311230607A CN 117368409 A CN117368409 A CN 117368409A
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 201
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 82
- 230000007613 environmental effect Effects 0.000 claims abstract description 48
- 238000012360 testing method Methods 0.000 claims description 46
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 18
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 14
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- ACXIAEKDVUJRSK-UHFFFAOYSA-N methyl(silyloxy)silane Chemical compound C[SiH2]O[SiH3] ACXIAEKDVUJRSK-UHFFFAOYSA-N 0.000 claims description 5
- 238000007865 diluting Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 238000012795 verification Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 64
- 238000010586 diagram Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000012430 stability testing Methods 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- YGSFNCRAZOCNDJ-UHFFFAOYSA-N propan-2-one Chemical compound CC(C)=O.CC(C)=O YGSFNCRAZOCNDJ-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0062—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display
- G01N33/0063—General constructional details of gas analysers, e.g. portable test equipment concerning the measuring method or the display, e.g. intermittent measurement or digital display using a threshold to release an alarm or displaying means
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/182—Level alarms, e.g. alarms responsive to variables exceeding a threshold
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention provides a method and a device for detecting the reliability of a sensor of a flammable refrigerant. The method comprises the following steps: alarming points are identified, reliability standards are obtained according to the alarming points, and the alarming points are obtained based on the ratio of the combustible gas specified by the international standards in the air content; configuring all environmental conditions, wherein the environmental conditions are obtained based on international standards; verifying that the flammable refrigerant sensor employs the environmental condition; the flammable refrigerant sensor terminates detection when it detects that any of the environmental conditions are not meeting the reliability criteria. The sensor of the combustible refrigerant is detected according to the proposed detection method, the reliability of each combustible refrigerant is analyzed, and if one of the detection is not passed, the sensor of the combustible refrigerant cannot be identified as being commercially available, and the performance is to be improved. The reliability of the sensor for detecting the flammable refrigerant is detected, and the safety problem caused by the unreliability of the sensor for detecting the flammable refrigerant is avoided.
Description
Technical Field
The invention belongs to the technical field of combustible refrigerant sensors, and particularly relates to a method and equipment for detecting the reliability of a combustible refrigerant sensor.
Background
Refrigerants are used in modern life, ranging from domestic refrigerators, domestic air conditioners, domestic automobiles and the like to industrial refrigerators, medical medicine refrigeration and the like. Many types of refrigerants have flammability and toxicity; these refrigerants that promote our quality of life have a potential hazard; for this reason, many detection systems for detecting refrigerant have been developed, which detect refrigerant leakage and alert people before safety problems are not raised. The reliability of the refrigerant (refrigerant) detection system is related to the safety of production and life, so many tests on the refrigerant sensor are necessary to verify the safety and reliability.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a method and equipment for detecting the reliability of a flammable refrigerant sensor, which are used for solving the problem of detecting the reliability of the flammable refrigerant sensor in the prior art.
In a first aspect, the present invention provides a method for detecting reliability of a sensor for a flammable refrigerant, comprising the steps of:
confirming an alarm point, and dividing the alarm point to obtain a reliability standard according to the alarm point, wherein the alarm point is obtained based on the ratio of the combustible gas specified by the international standard to the air content;
configuring all environmental conditions, wherein the environmental conditions are obtained based on international standards;
verifying that the flammable refrigerant sensor employs the environmental condition;
the flammable refrigerant sensor terminates detection when it detects that any of the environmental conditions are not meeting the reliability criteria.
In one possible embodiment, the flammable refrigerant sensor terminates detection upon detecting the occurrence of any environmental condition that does not meet the reliability criteria, comprising:
and outputting a qualified report when the combustible refrigerant to be tested completes all environmental condition checks and no alarm appears.
In one possible implementation, the reliability criteria include:
the flammable refrigerant sensor does not give an alarm when the flammable refrigerant gas with low density is used;
the flammable refrigerant sensor generates an alarm when the flammable refrigerant gas is of high density.
In one possible embodiment, the verifying the flammable refrigerant sensor using the environmental condition includes:
the ambient conditions are set to a first temperature range and a first air humidity range;
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a test result based on the reliability standard.
In one possible embodiment, the verifying the flammable refrigerant sensor using the environmental condition includes:
initializing an environmental condition of the flammable refrigerant sensor;
the environmental conditions are configured as a second temperature range and a second air humidity range:
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a detection result based on the reliability standard.
A possible embodiment, before said verifying the sensor for flammable refrigerant with said environmental condition, comprises:
exposing the flammable refrigerant sensor to a limiting temperature for a second verification time, wherein the limiting temperature is the highest or lowest temperature rated for the flammable refrigerant;
detecting the flammable refrigerant sensor based on the reliability standard to obtain an intermediate result;
judging the intermediate result according to the reliability standard
If the intermediate result is not passed, the detection is terminated;
when the intermediate result is a pass:
the ambient conditions are set to a first temperature range and a first air humidity range;
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a test result based on the reliability standard.
In one possible embodiment, the checking the flammable refrigerant sensor for the environmental condition further comprises:
placing the flammable refrigerant sensor in a sensitive gas for a set time, wherein the concentration of the sensitive gas is always ensured to be within an alarm point of the flammable refrigerant sensor, and the flammable refrigerant sensor does not alarm;
the sensitive gas comprises one or more of methane, n-butane, n-heptane, ethyl acetate, isopropanol, carbon dioxide, ammonia, ethanol, toluene, acetone, methyldisiloxane and the like.
In one possible embodiment, the checking the flammable refrigerant sensor for the environmental condition further comprises:
placing the flammable refrigerant sensor in air mixed with oily refrigerant for a set time;
diluting air mixed with oily refrigerant, and observing the flammable refrigerant sensor to obtain an intermediate result; judging the intermediate result according to the reliability standard
If the intermediate result is not passed, the detection is terminated;
when the intermediate result is a pass:
the ambient conditions are set to a first temperature range and a first air humidity range;
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a test result based on the reliability standard.
In a second aspect, the present invention provides a device for detecting the reliability of a sensor for a flammable refrigerant, comprising:
the electric control box is used for configuring all environmental conditions and debugging;
and a detection container for providing a sensor of the combustible refrigerant for detection;
the electric control box is electrically connected with the detection container;
and a temperature and humidity display screen is arranged on the detection container to display the current temperature and humidity of the detection container.
In one possible embodiment, the detection container further comprises:
the air inlet pipe is used for pumping clean high-pressure air into the detection container;
a gas inlet for adding a sensitive gas into the detection vessel;
and an exhaust pipe for exhausting the detected gas.
The method and the device for detecting the reliability of the sensor of the combustible refrigerant provided by the embodiment of the invention have the following beneficial effects:
the sensor for detecting the combustible refrigerant according to the proposed detection method, and the reliability of each combustible refrigerant is analyzed, and the method is generally classified into performance detection and safety detection. Performance testing includes calibration and short term stability testing, humidity testing, temperature testing, shock testing, and response time testing. Security tests include anti-contamination tests and long-term stability tests. The calibration and the short-term stability detection are particularly basic, and the safety detection needs to be repeated through the calibration and the short-term stability to confirm whether the combustible refrigerant sensor meets the standard or not, so that the sensor can work normally. If one of the tests fails, the flammable refrigerant sensor is not deemed commercially viable and performance is to be improved. The reliability of the flammable refrigerant sensor is detected, the safety problem caused by unreliable flammable refrigerant sensor is avoided, and the working performance specification of the commercial flammable refrigerant sensor is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a step diagram of a method for detecting reliability of a sensor of a flammable refrigerant according to an embodiment of the present invention;
FIG. 2 is a logic diagram of a method of detecting the reliability of a flammable refrigerant sensor;
FIG. 3 is a step diagram of calibration and short term stability detection;
FIG. 4 is a step diagram of humidity detection;
FIG. 5 is a step diagram of temperature detection
FIG. 6 is a step diagram of oil stain resistance detection;
fig. 7 is a schematic structural diagram of a device for detecting reliability of a sensor for flammable refrigerant according to an embodiment of the present invention.
Description of the drawings:
1. an electric control box; 2. a detection container; 3. a test chamber; 4. a gas inlet; 5. a temperature and humidity display screen; 6. a cylinder; 7. sealing cover; 8. an electric control ball valve; 9. an air inlet pipe; 10. and an exhaust pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present invention, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
Referring to fig. 1-2, the invention provides a method for detecting the reliability of a sensor of a flammable refrigerant, comprising the following steps:
s100: confirming an alarm point, and dividing the alarm point to obtain a reliability standard according to the alarm point, wherein the alarm point is obtained based on the ratio of the combustible gas specified by the international standard to the air content;
s200: configuring all environmental conditions, wherein the environmental conditions are obtained based on international standards;
s300: verifying that the flammable refrigerant sensor employs the environmental condition;
s400: the flammable refrigerant sensor terminates detection when it detects that any of the environmental conditions are not meeting the reliability criteria.
The sensor for detecting the combustible refrigerant according to the proposed detection method, and the reliability of each combustible refrigerant is analyzed, and the method is generally classified into performance detection and safety detection. Performance testing includes calibration and short term stability testing, humidity testing, temperature testing, shock testing, and response time testing. Security tests include anti-contamination tests and long-term stability tests. The calibration and the short-term stability detection are particularly basic, and the safety detection needs to be repeated through the calibration and the short-term stability to confirm whether the combustible refrigerant sensor meets the standard or not, so that the sensor can work normally. If one of the tests fails, the flammable refrigerant sensor is not deemed commercially viable and performance is to be improved.
The alarm point is a critical value, responds and distinguishes the ratio of the combustible refrigerant gas in the air content, and is formulated by combining the factory parameters of the combustible refrigerant sensor to be detected. When the air content of the combustible gas is larger than the alarm point, the combustible gas does not alarm when the air content of the combustible gas is smaller than the alarm point. Its international standard is obtained according to IEC 60335-2-40-2022.
In one possible embodiment, the flammable refrigerant sensor terminates detection upon detecting the occurrence of any environmental condition that does not meet the reliability criteria, comprising:
and outputting a qualified report when the combustible refrigerant to be tested completes all environmental condition checks and no alarm appears.
In one possible implementation, the reliability criteria include:
the flammable refrigerant sensor does not give an alarm when the flammable refrigerant gas with low density is used;
the flammable refrigerant sensor generates an alarm when the flammable refrigerant gas is of high density.
According to actual conditions, the flammable refrigerant sensor works normally, is in an allowable range when detecting that the flammable refrigerant is released at low density, and is easy to burn and even explode when high density occurs, so that an alarm needs to be sent out in time when the flammable refrigerant sensor detects, and the safety problem is avoided.
Referring to fig. 3, in one possible embodiment, the checking the flammable refrigerant sensor for the environmental condition includes:
s310: the ambient conditions are set to a first temperature range and a first air humidity range;
s311: checking the sensor of the combustible refrigerant according to a preset first checking time interval;
s312: and obtaining a test result based on the reliability standard.
The specific operation mode is as follows: calibration and short term stability detection, a suitable low density flammable refrigerant gas and a high density flammable refrigerant gas are selected based on the alarm point of the flammable refrigerant that has been identified. The flammable refrigerant sensor is placed in a first temperature range, i.e., a range of 15 to 25 degrees celsius, and a first air humidity, i.e., an air humidity of 30% rh to 70% rh, and is detected using the divided low-density flammable refrigerant gas and high-density flammable refrigerant gas, respectively. And placing the combustible refrigerant sensor in the low-density combustible refrigerant gas for standing for 5 minutes, taking out the combustible refrigerant from the low-density combustible refrigerant gas, sensing the combustible refrigerant into fresh air for 5 minutes, and observing whether an alarm appears. And repeating the steps, placing the flammable refrigerant sensor in the low-density flammable refrigerant gas, standing for 5 minutes, taking out and observing to finish the detection twice. Similarly, the high-density flammable refrigerant gas was allowed to stand for 5 minutes in the above operation, and then taken out and observed to stand in fresh air at 5 minutes intervals, and the detection was repeated twice as to whether an alarm was given. At this time, the detected flammable refrigerant sensor based on the reliability criteria should not alarm in the low-density flammable refrigerant gas; alarm should be given in a high density flammable refrigerant gas. If the sensor is not matched, the sensor cannot be considered to be commercially available, the performance is to be improved, and the detection is finished.
The first test time interval means that the test was stopped for 5 minutes and was observed for 5 minutes.
Referring to fig. 4, in one possible embodiment, the checking the flammable refrigerant sensor for the environmental condition includes:
s320: initializing an environmental condition of the flammable refrigerant sensor;
s321: the environmental conditions are configured as a second temperature range and a second air humidity range:
s322: checking the sensor of the combustible refrigerant according to a preset first checking time interval;
s323: and obtaining a detection result based on the reliability standard.
The specific operation mode is as follows: humidity detection, the combustible refrigerant sensor is subjected to initial environmental adjustment, and the combustible refrigerant sensor is exposed to clean air humidified to (30+/-5)% RH for 60 minutes at (15+/-2) DEG C. Then, the alarm point of the confirmed combustible refrigerant selects proper low-density combustible refrigerant gas and low-density combustible refrigerant gas, and the low-density combustible refrigerant gas are repeatedly detected for 2 times in sequence in a second temperature range, namely a range of (40+/-2) DEG C and a second air humidity range, namely an air humidity of 90%RH, and the time period of each standing is 5 minutes, and the obtained product is taken out and observed for 5 minutes. Operation such as calibration and short term stability detection, the detected flammable refrigerant sensor based on the reliability criteria should not alarm in low density flammable refrigerant gas; alarm should be given in a high density flammable refrigerant gas. If the sensor is not matched, the sensor cannot be considered to be commercially available, the performance is to be improved, and the detection is finished.
Referring to fig. 5, in one possible embodiment, before the testing of the flammable refrigerant sensor for the environmental condition, the method includes:
s330, exposing the flammable refrigerant sensor to a limiting temperature for a second inspection time, wherein the limiting temperature is the rated highest temperature or the rated lowest temperature of the flammable refrigerant;
s331, detecting the flammable refrigerant sensor based on the reliability standard to obtain an intermediate result;
s332, judging the intermediate result according to the reliability standard;
s333, if the intermediate result is not passed, stopping detection;
and S334, repeating the steps S310-S312 when the intermediate result is passing.
The specific operation mode is as follows: and (3) temperature testing, namely, exposing the combustible refrigerant sensor to the limiting temperature for a second checking time, namely, at least 60 minutes, wherein the rated highest temperature or the lowest temperature in the combustible refrigerant sensor is the limiting temperature. And simultaneously placing the flammable refrigerant sensor in a flammable refrigerant gas with low density, which is selected according to the confirmed alarm point of the flammable refrigerant, in a second checking time, observing whether an alarm appears, if so, considering that the flammable refrigerant sensor is damaged by the limiting temperature, and stopping detection, wherein the flammable refrigerant sensor cannot be considered to be commercially available, and the performance is to be improved. If the alarm does not appear, continuing to detect, selecting a proper high-density combustible refrigerant gas according to the confirmed alarm point of the combustible refrigerant, observing whether the alarm appears, and if so, continuing to perform the next detection. If the alarm appears, the detection is terminated.
And then respectively detecting at the high limit temperature and the low limit temperature, wherein the intermediate result, namely the preliminary detection result, meets the reliability standard, and then performing calibration and short-term stability detection.
Further, vibration detection: the combustible refrigerant sensor is fixed at a preset installation position and sequentially and firmly fixed on a variable speed vibration testing machine, the amplitude and the frequency of the vibration testing machine are 10Hz to 31.5Hz, the total offset is 1.0mm, the total offset is 31.5Hz to 150Hz, and the acceleration peak value is 2g; the flammable refrigerant sensor should vibrate in each of three mutually perpendicular planes for 1 hour at prescribed frequency ranges, displacements and accelerations. The change rate is not more than 10Hz/min; and after the vibration test, performing a test according to the test, the calibration test and the short-term stability test, and checking whether the sensor of the flammable refrigerant is normal or not after the vibration test.
Still further, response time detection: the flammable refrigerant sensor was exposed to a step change in gas volume ratio from clean air to test gas that should be 24% to 25% of LFL in 5 seconds. The flammable refrigerant sensor should give an output signal within 30 seconds after the step change is completed. The flammable refrigerant sensor is then exposed to clean air. If the flammable refrigerant sensor signals a gas leak after 5 hours of exposure to clean air, the flammable refrigerant sensor fails and is not commercially viable, and performance is to be improved, while the test is completed.
In one possible embodiment, the checking the flammable refrigerant sensor for the environmental condition further comprises:
placing the flammable refrigerant sensor in a sensitive gas for a set time, wherein the concentration of the sensitive gas is always ensured to be within an alarm point of the flammable refrigerant sensor, and the flammable refrigerant sensor does not alarm;
the sensitive gas comprises one or more of methane, n-butane, n-heptane, ethyl acetate, isopropanol, carbon dioxide, ammonia, ethanol, toluene, acetone, methyldisiloxane and the like.
The specific operation mode is as follows: and (3) detecting the gas pollution resistance, namely sequentially exposing the flammable refrigerant sensor to gases such as methane, n-butane, n-heptane, ethyl acetate, isopropanol, carbon dioxide, ammonia, ethanol, toluene, acetone, methyl disiloxane and the like, and entering the concentrations of the gases in table 1, wherein the concentrations of the gases are controlled at a peak value defined by an alarm point, so that the flammable refrigerant sensor is always not alarm. Each gas and the flammable refrigerant sensor remained in the sealed chamber for 2 hours. After each end of the coexistence of one gas, the flammable refrigerant was sensed for a 16 hour recovery time, which 16 hours would be in clean air, and then another gas was tested. And after all gases coexist, checking whether the flammable refrigerant sensor meets the reliability standard or not according to calibration and short-term stability detection, and judging whether the flammable refrigerant sensor is commercially available or not.
Table 1: gas concentration meter
| Gas and its preparation method | Concentration (ppm: parts per million) |
| Methane | 500 |
| N-butane | 300 |
| N-heptane | 500 |
| Acetic acid ethyl ester | 200 |
| Isopropyl alcohol | 200 |
| Carbon dioxide | 5000 |
| Ammonia | 100 |
| Ethanol | 200 |
| Toluene (toluene) | 200 |
| Acetone (acetone) | 200 |
| Methyldisiloxane | 110 |
Referring to fig. 6, in one possible embodiment, the checking the flammable refrigerant sensor for the environmental condition further includes:
s340, placing the flammable refrigerant sensor in air mixed with oily refrigerant, and allowing a set time to elapse;
s341, diluting air mixed with oily refrigerant, and observing the flammable refrigerant sensor to obtain an intermediate result;
s342, judging the intermediate result according to the reliability standard;
s343, if the intermediate result is not passed, stopping detection;
and S344, repeating the steps S310-S312 when the intermediate result is passing.
The specific operation mode is as follows: and (3) detecting the oil stain resistance, namely blowing air mixed with the oily refrigerant into the combustible refrigerant until the oily refrigerant reaches 24-25% of the upper ignition limit (Lower Flammable Limit, abbreviated as LFL) of the combustible gas, wherein the upper ignition limit of the combustible gas refers to the volume ratio of the combustible gas to the air in the air, and when the concentration of the combustible gas reaches a certain degree, oxygen in the air is completely consumed, the combustible gas cannot be combusted, and the minimum concentration of combustion no longer occurs.
The release of the oily refrigerant is maintained until a prescribed amount is released. This takes about 4 minutes from release. And observing the flammable refrigerant sensor, such as sending out an output signal indicating refrigerant leakage, informing a user that the refrigerant sensor needs to be replaced, stopping the test, and considering that the oil stain resistance is unqualified. If no output signal of refrigerant leakage is sent, the detection is continued. The anti-oil performance needs to be repeated 5 times, and if the anti-oil performance is normal, calibration and short-term stability detection are carried out.
Referring to fig. 7, the present invention provides a device for detecting reliability of a sensor of a flammable refrigerant, comprising:
the electric control box 1 is used for configuring all environmental conditions and debugging;
and a detection container 2 for providing a sensor of the combustible refrigerant for detection;
the electric control box 1 is electrically connected with the detection container 2;
the detecting container 1 is also provided with a temperature and humidity display screen 5 for displaying the current temperature and humidity of the detecting container 2.
The temperature and humidity in the detection container 2 are controlled by the electric control box 1, and the temperature and humidity in the detection container are observed through the temperature and humidity display screen 5 so as to confirm and detect the environmental condition of the sensor for detecting the combustible refrigerant.
In one possible embodiment, the detection container 2 further comprises:
an air intake pipe 9 for injecting clean high-pressure air into the inside of the detection container;
a gas inlet 4 for introducing a sensitive gas into the detection vessel;
and an exhaust pipe 10 for exhausting the detected gas.
The temperature and humidity of the test box 3 in the detection container 2 are kept the same through the air cylinder 6 and the sealing cover 7; the electric cabinet 1 is manually operated to start the air cylinder 6 to press the sealing cover 7 on the sealable test box 3, so that the sealable test box forms a sealed space. The test chamber is used for placing the sensor of the combustible refrigerant for detection.
The function of the test gas inlet 4 is to obtain the required gas concentration by injecting the required combustible refrigerant gas using an injector; the fluorine rubber material is filled in the gas inlet 4 for detection, and a sealing bolt is arranged at the outer side; after the gas is injected, the sealing bolt is screwed down, so that the tightness is ensured, and no air flows into the sealable test box through the pinhole gap.
The cleaning high-pressure air inlet pipe 9, the electric control ball valve 8 and the exhaust pipe 10 are used for opening the electric control ball valve 8 connected to the cleaning high-pressure air inlet pipe 9 and the exhaust pipe 10 before repeated detection or switching other detection, and the combustible refrigerating gas in the sealable test box is rapidly discharged after the cleaning high-pressure air is introduced.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The method for detecting the reliability of the sensor of the combustible refrigerant is characterized by comprising the following steps:
confirming an alarm point, and dividing the alarm point to obtain a reliability standard according to the alarm point, wherein the alarm point is obtained based on the ratio of the combustible gas specified by the international standard to the air content;
configuring all environmental conditions, wherein the environmental conditions are obtained based on international standards;
verifying that the flammable refrigerant sensor employs the environmental condition;
the flammable refrigerant sensor terminates detection when it detects that any of the environmental conditions are not meeting the reliability criteria.
2. The method for detecting the reliability of a flammable refrigerant sensor as recited in claim 1 wherein said flammable refrigerant sensor terminates detection upon detecting the occurrence of a failure to meet said reliability criteria for any one of the environmental conditions, comprising:
and outputting a qualified report when the combustible refrigerant to be tested completes all environmental condition checks and no alarm appears.
3. The method for detecting the reliability of a sensor of a flammable refrigerant as recited in claim 2 wherein said reliability criteria comprises:
the flammable refrigerant sensor does not give an alarm when the flammable refrigerant gas with low density is used;
the flammable refrigerant sensor generates an alarm when the flammable refrigerant gas is of high density.
4. The method for detecting the reliability of a flammable refrigerant sensor as recited in claim 3 wherein said verifying the flammable refrigerant sensor using said environmental condition comprises:
the ambient conditions are set to a first temperature range and a first air humidity range;
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a test result based on the reliability standard.
5. The method for detecting the reliability of a flammable refrigerant sensor as recited in claim 3 wherein said verifying the flammable refrigerant sensor using said environmental condition comprises:
initializing an environmental condition of the flammable refrigerant sensor;
the environmental conditions are configured as a second temperature range and a second air humidity range:
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a detection result based on the reliability standard.
6. The method for detecting the reliability of a sensor of a flammable refrigerant as recited in claim 4, comprising, prior to said detecting said sensor of a flammable refrigerant using said environmental condition:
exposing the flammable refrigerant sensor to a limiting temperature for a second verification time, wherein the limiting temperature is the highest or lowest temperature rated for the flammable refrigerant;
detecting the flammable refrigerant sensor based on the reliability standard to obtain an intermediate result;
judging the intermediate result according to the reliability standard
If the intermediate result is not passed, the detection is terminated;
when the intermediate result is a pass:
the ambient conditions are set to a first temperature range and a first air humidity range;
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a test result based on the reliability standard.
7. The method for detecting the reliability of a flammable refrigerant sensor as recited in claim 3 wherein said detecting the flammable refrigerant sensor using said environmental condition further comprises:
placing the flammable refrigerant sensor in a sensitive gas for a set time, wherein the concentration of the sensitive gas is always ensured to be within an alarm point of the flammable refrigerant sensor, and the flammable refrigerant sensor does not alarm;
the sensitive gas comprises one or more of methane, n-butane, n-heptane, ethyl acetate, isopropanol, carbon dioxide, ammonia, ethanol, toluene, acetone, methyldisiloxane and the like.
8. The method for detecting the reliability of a flammable refrigerant sensor as recited in claim 3 wherein said detecting the flammable refrigerant sensor using said environmental condition further comprises:
placing the flammable refrigerant sensor in air mixed with oily refrigerant for a set time;
diluting air mixed with oily refrigerant, and observing the flammable refrigerant sensor to obtain an intermediate result;
judging the intermediate result according to the reliability standard;
if the intermediate result is not passed, the detection is terminated;
when the intermediate result is a pass:
the ambient conditions are set to a first temperature range and a first air humidity range;
checking the sensor of the combustible refrigerant according to a preset first checking time interval;
and obtaining a test result based on the reliability standard.
9. A device for detecting the reliability of a sensor of a flammable refrigerant, comprising:
the electric control box is used for configuring all environmental conditions and debugging;
and a detection container for providing a sensor of the combustible refrigerant for detection;
the electric control box is electrically connected with the detection container;
and a temperature and humidity display screen is arranged on the detection container to display the current temperature and humidity of the detection container.
10. The flammable refrigerant sensor reliability detection apparatus of claim 9, wherein said detection vessel further comprises:
the air inlet pipe is used for pumping clean high-pressure air into the detection container;
a gas inlet for adding a sensitive gas into the detection vessel;
and an exhaust pipe for exhausting the detected gas.
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