CN107817330B - Detection value correction method and detection method of difluoromethane leakage detection device - Google Patents
Detection value correction method and detection method of difluoromethane leakage detection device Download PDFInfo
- Publication number
- CN107817330B CN107817330B CN201711058686.XA CN201711058686A CN107817330B CN 107817330 B CN107817330 B CN 107817330B CN 201711058686 A CN201711058686 A CN 201711058686A CN 107817330 B CN107817330 B CN 107817330B
- Authority
- CN
- China
- Prior art keywords
- difluoromethane
- concentration
- value
- temperature
- alarm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 title claims abstract description 332
- 238000001514 detection method Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012937 correction Methods 0.000 title claims abstract description 17
- 229910001868 water Inorganic materials 0.000 claims abstract description 101
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000005057 refrigeration Methods 0.000 claims description 41
- 238000004891 communication Methods 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims description 11
- 238000009423 ventilation Methods 0.000 claims description 9
- 230000002277 temperature effect Effects 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004868 gas analysis Methods 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 31
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 14
- 239000001294 propane Substances 0.000 description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 3
- 239000001273 butane Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 2
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000002512 chemotherapy Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005264 electron capture Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000700 radioactive tracer Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N33/22—Fuels; Explosives
- G01N33/225—Gaseous fuels, e.g. natural gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention provides a detection value correction method and a detection method of a difluoromethane leakage detection device, which belong to the field of gas analysis, are based on an ultrasonic detection principle, are provided with an air chamber, an ultrasonic sensor and a temperature and humidity sensor, determine a temperature influence value and a water content influence value in air by respectively fitting the relationship between a temperature value, an actual water content value in air and a difluoromethane (R32) concentration value, and can realize the detection of the concentration of the difluoromethane (R32) after leakage; and the detection result is compared with the set alarm concentration value, and finally the comparison result is transmitted to the alarm device, so that the user can conveniently take corresponding maintenance measures and timely eliminate hidden dangers.
Description
Technical Field
The invention belongs to the field of gas analysis, and particularly relates to a detection value correction method and a detection method of a difluoromethane (R32) leakage detection device.
Background
The main component of freon (R22) is fluorine, and the freon is widely used in the refrigeration field of air conditioners and the like as a traditional refrigerant, and has great damage to the ozone layer, according to the research, a plurality of ozone layer cavities appear on the earth, the area of some cavities exceeds the area of Africa, and in addition, the freon can also cause greenhouse effect, and along with the increasing environmental awareness of people, the attention and the development of the refrigerant which has no influence or little influence on the ozone layer compared with freon (R22) are necessary. According to the implementation of international convention such as Montreal protocol, Kyoto protocol and the like, Freon (R22) no longer becomes the current main refrigerant, a novel refrigerant capable of replacing the traditional refrigerant is researched all over the world, especially in Europe, America, Japan and the like, the prospect is better due to the fact that the domestic research and development basis is difluoromethane (R32), mixed refrigerant (R410), propane (R290) and the like, and two indexes are selected according to the novel refrigerant: 1. the ODP value (ozone layer destruction potential value) is zero, which is a requirement that must be met by replacing the traditional refrigerant; 2. the GWP values (potential for greenhouse effect) are relatively low. Difluoromethane (R32) has zero ODP value and lower GWP value relative to the mixed refrigerant (R410), and has the advantages of environmental protection; compared with propane (R290), although the GWP value of the refrigerant is higher than that of propane (R290), propane (R290) is extremely easy to burn, difluoromethane (R32) is more important in safety and cost, the popularization value is higher, and U.S. and Japanese air conditioner manufacturers also tend to use difluoromethane (R32) as a substitute direction of future refrigerants.
Difluoromethane (R32) is a gas at normal temperature, and is nontoxic and combustible, and researches show that difluoromethane (R32) can be combusted to cause explosion when reaching 0.306kg/m3 (the volume ratio is 14.4%) in the air, and in view of safety, a difluoromethane (R32) leakage detection device needs to be configured in practical application, so that the safety of design, installation and maintenance personnel of refrigeration equipment such as users, air conditioners and the like is ensured. From this, it is found that, considering difluoromethane (R32) as a novel refrigerant, attention must be paid to a difluoromethane (R32) leak detection technique, and the market prospect is not insignificant. Document WO2016/103786a1 proposes "a refrigerant leakage detection device that is not susceptible to aging changes", in which leakage of refrigerants such as difluoromethane (R32), propane (R290), propylene (R1270), and butane (R600) is detected, and in particular, a refrigerant leakage detection device is provided on the outer periphery of a refrigerant tube, a refrigeration ventilation device is provided in a casing, the refrigerant leakage detection device is used to detect the refrigerant leakage, and the leaked refrigerant is diffused by the refrigeration ventilation device, thereby reducing the concentration of the leaked refrigerant, but it does not disclose how the detection device is provided and implemented to detect refrigerants such as difluoromethane (R32), propane (R290), propylene (R1270), and butane (R600); document US2010/0251803a1 proposes "a detectable refrigerant composition and a detection method", which discloses at least one hydrofluorocarbon refrigerant comprising difluoromethane (R32), fluoromethane (HFC-41), etc., and an effective amount of a tracer comprising at least one C1-4 hydrochlorocarbon, which is added to facilitate detection after refrigerant leakage; also included is a detector for detecting the refrigerant composition, the detector being selected from the group consisting of chemo/electro-active array detectors, corona discharge detectors, heated diode detectors, heated electrochemical detectors, photo-ionization detectors, infrared detectors, ultrasonic detectors, and electron capture detectors, but the document does not disclose how the above detector is used to perform the detection, and how the detector is positioned. Document CN205038017U proposes "a refrigerant leakage detection device and a refrigeration and ventilation device" capable of measuring difluoromethane (R32), propane (R290), and the like, and the refrigerant leakage detection device includes an impeller and two rotation detection sensors, detects leakage of refrigerant from rotation of the impeller, and still has a great potential safety hazard.
In summary, with the development of new refrigerant technology, a technology capable of detecting the leakage of flammable refrigerant difluoromethane (R32) is urgently needed.
Disclosure of Invention
The invention provides a detection value correction method and a detection method of a difluoromethane (R32) leakage detection device, which are based on an ultrasonic detection principle, are provided with a gas chamber, an ultrasonic sensor and a temperature and humidity sensor, determine a temperature influence value f (T) and a water content influence value f (H20) in air by respectively fitting a relation between a temperature value, an actual water content value in the air and a difluoromethane (R32) concentration value, and can realize the detection of the concentration of the difluoromethane (R32) after leakage; and the detection result is compared with the set alarm concentration value P, and finally the comparison result is transmitted to the alarm device, so that a user can conveniently take corresponding maintenance measures and timely eliminate hidden dangers.
The utility model provides a difluoromethane (R32) leaks detection device, includes air chamber, ultrasonic sensor, temperature and humidity sensor, ultrasonic sensor sets up in the air chamber, temperature and humidity sensor measures temperature and humidity in the air chamber, ultrasonic sensor measures the concentration of difluoromethane in the air chamber to carry out the correction according to temperature and humidity to the concentration value of the difluoromethane who surveys.
Preferably, the air chamber and the temperature and humidity sensor are arranged on the circuit board.
Preferably, the air conditioner further comprises a control unit arranged on the circuit board, wherein the control unit controls the opening or closing of an air interchanger for a refrigeration equipment end; the circuit board is also provided with a communication unit for communicating with the refrigeration equipment and transmitting data.
Preferably, an alarm is further arranged on the circuit board and used for giving a difluoromethane (R32) leakage alarm.
A difluoromethane (R32) leak detection value correction method implemented by a difluoromethane (R32) leak detection device, the method comprising the steps of:
s1: filling the tested gas difluoromethane (R32);
s2: test temperature effect on difluoromethane (R32) concentration: the temperature value measured by the temperature and humidity sensor is T, and the concentration value of difluoromethane (R32) measured by the ultrasonic sensor is CMeasuringThrough T, CMeasuringFitting two groups of test data to obtain a relation between the two test data, and obtaining an influence value f (T) of temperature on the concentration of difluoromethane (R32);
s3: eliminating the influence of temperature and outputting the concentration value C ═ CMeasuring-f(T)；
S4: the actual water content in air was tested for its effect on difluoromethane (R32) concentration: according to the reading of the temperature and humidity sensor, the actual water content in the air is calculated to be CH2OThe value of the concentration after eliminating the influence of the temperature is C, through C, CH2OFitting a relation between the two groups of test data to obtain an influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32);
s5: eliminating the influence of actual water content in air and outputting the concentration value C ═ C-f (H20) ═ CMeasuring-f(T)-f(H20)。
A difluoromethane (R32) leak detection value correction method, said method comprising the steps of:
s1: filling the tested gas difluoromethane (R32);
s2: the actual water content in air was tested for its effect on difluoromethane (R32) concentration: the concentration value of difluoromethane (R32) measured by the ultrasonic sensor is CMeasuringAccording to the reading of the temperature and humidity sensor, the actual water content in the air is calculated to be CH2OThrough CMeasuring、CH2OFitting a relation between the two groups of test data to obtain an influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32);
s3: eliminating the influence of actual water content in air and outputting the concentration value C ═ CMeasuring-f(H20)；
S4: test temperature effect on difluoromethane (R32) concentration: the temperature value measured by the temperature and humidity sensor is T, the concentration value after the influence of the actual water content in the air is eliminated is C, a relational expression between the temperature value and the concentration value is fitted through T, C two groups of test data, and the influence value of the temperature on the concentration of difluoromethane (R32) is f (T);
s5: eliminating the influence of temperature, and outputting concentration value C ═ C-f (T) C ═ CMeasuring-f(H20)-f(T)。
A difluoromethane (R32) leakage detection value correction method is characterized in that: the method comprises the following steps:
s1: filling the tested gas difluoromethane (R32);
s2: the influence value f (T) of the temperature on the concentration of the difluoromethane (R32) and the influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32) are tested, and the concentration value of the difluoromethane (R32) measured by an ultrasonic sensor is CMeasuringTo eliminate the influence of temperature and the actual water content in the air, the output concentration value C' was measured as-f (H20) -f (t).
A difluoromethane (R32) leak detection method, said method comprising the steps of:
s1: p is an alarm concentration value of difluoromethane (R32), and is arranged in a difluoromethane (R32) leakage detection device before leaving a factory, wherein P is set to be in three levels of I, II and III, I is 10% of LFL (lowest combustible concentration) of combustible gas, II is 20% of LFL (lowest combustible concentration) of combustible gas, and III is 25% of LFL (lowest combustible concentration) of combustible gas;
s2: difluoromethane (R32) leaks the checkout gear and outputs the concentration value C 'after revising, when C' is less than or equal to 0 ≤ I, the alarm does not work;
s3: when I is less than or equal to C' and less than II, the alarm works, the mode is set as first-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is first-level alarm, so as to take care of precaution;
s4: when the II is less than or equal to C' and less than III, the alarm works, the mode is set to be a secondary alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is the secondary alarm, and the user needs to intervene and eliminate hidden danger within a specified time;
s5: when the value C' is III, the alarm works, the mode is set to be three-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through the communication unit arranged on the circuit board, the user is prompted to leak to reach the set alarm concentration value, meanwhile, the control unit on the circuit board starts the air interchanger at the refrigeration equipment end, and the hidden danger needs to be immediately intervened and eliminated.
A difluoromethane (R32) leak detection method, characterized by: the method comprises the following steps:
s1: filling the tested gas difluoromethane (R32);
s2: testing an influence value f (T) of temperature on the concentration of difluoromethane (R32) and an influence value f (H20) of actual water content in air on the concentration of difluoromethane (R32), wherein the concentration value of difluoromethane (R32) measured by an ultrasonic sensor is C, and in order to eliminate the influence of temperature and actual water content in air, the output concentration value C ═ CMeasuring-f(H20)-f(T)；
S3: p is an alarm concentration value of difluoromethane (R32), and is arranged in a difluoromethane (R32) leakage detection device before leaving a factory, wherein P is set to be in three levels of I, II and III, I is 10% of LFL (lowest combustible concentration) of combustible gas, II is 20% of LFL (lowest combustible concentration) of combustible gas, and III is 25% of LFL (lowest combustible concentration) of combustible gas;
s4: difluoromethane (R32) leaks the checkout gear and outputs the concentration value C 'after revising, when C' is less than or equal to 0 ≤ I, the alarm does not work;
s5: when I is less than or equal to C' and less than II, the alarm works, the mode is set as first-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is first-level alarm, so as to take care of precaution;
s6: when the II is less than or equal to C' and less than III, the alarm works, the mode is set to be a secondary alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is the secondary alarm, and the user needs to intervene and eliminate hidden danger within a specified time;
s7: when the value C' is III, the alarm works, the mode is set to be three-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through the communication unit arranged on the circuit board, the user is prompted to leak to reach the set alarm concentration value, meanwhile, the control unit on the circuit board starts the air interchanger at the refrigeration equipment end, and the hidden danger needs to be immediately intervened and eliminated.
The difluoromethane (R32) leakage detection device and the method are based on an ultrasonic detection principle, the air chamber, the ultrasonic sensor and the temperature and humidity sensor are arranged, the temperature influence value f (T) and the water content influence value f (H20) in the air are determined respectively by fitting the relationship among the temperature value, the actual water content value in the air and the concentration value of difluoromethane (R32), and accurate detection of the concentration of the leaked difluoromethane (R32) can be realized; and the detection result is compared with the set alarm concentration value P, and finally the comparison result is transmitted to the alarm device, so that a user can conveniently take corresponding maintenance measures and timely eliminate hidden dangers.
It should be understood that the above description is intended to be illustrative, and not to limit the scope of the invention.
Drawings
FIG. 1 is a block diagram of the construction of an embodiment of the difluoromethane (R32) leak detection apparatus of the present invention;
FIG. 2 is a flow chart of one embodiment of a difluoromethane (R32) leak detection value correction method in accordance with the present invention;
FIG. 3 is a flow chart of another embodiment of a difluoromethane (R32) leak detection value correction method in accordance with the present invention;
FIG. 4 is a flow chart of one embodiment of a difluoromethane (R32) leak detection method of the present invention;
FIG. 5 is a temperature-concentration fit of an embodiment of the difluoromethane (R32) leak detection method of the present invention;
fig. 6 is a plot of actual water content-concentration in air fitted to an embodiment of the difluoromethane (R32) leak detection method of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
The first embodiment is as follows:
fig. 1 shows a difluoromethane (R32) leakage detection device, which comprises a gas chamber 20, an ultrasonic sensor 30, a temperature and humidity sensor 40, a control unit 50, an alarm 60, a communication unit 70 and a circuit board 80, wherein the ultrasonic sensor 30 is arranged in the gas chamber 20, and in one embodiment, two ultrasonic sensors 30 are arranged in the gas chamber 20.
The air chamber 20, the temperature and humidity sensor 40, the control unit 50, the communication unit 70 and the alarm 60 are all arranged on the circuit board 80, the control unit 50 is used for controlling the opening or closing of the ventilation device at the refrigeration equipment end, and the communication unit 70 is used for communicating with the refrigeration equipment.
The alarm 60 is used for giving an alarm of difluoromethane (R32) leakage, and can be an audible and visual alarm, wherein the audible and visual alarm can set alarm lamps with different colors according to whether difluoromethane (R32) leakage reaches an alarm concentration value P or not, and for example, when reaching the I level, a blue lamp is used for alarming; when reaching level II, a yellow light is used for warning; reaching level III, and warning with a red light.
In application, a difluoromethane (R22) leakage detection device is installed on the refrigeration equipment 90, and the ventilation device 91 can be preferably installed on the refrigeration equipment 90.
Example two:
please refer to fig. 2, which is a flowchart illustrating a method for correcting a difluoromethane (R32) leakage detection value by the difluoromethane (R32) leakage detection apparatus of fig. 1, comprising the following steps:
s201: charging difluoromethane (R32);
s202: the effect of temperature on difluoromethane (R32) concentration was first tested: temperature value T measured by temperature and humidity sensor 40, and corresponding difluoromethane (R32) concentration value C measured by ultrasonic sensor 30MeasuringThrough a plurality of groups of corresponding temperature values T and concentration values CMeasuringFitting the data to obtain a relation between the temperature value T and the difluoromethane(R32) concentration value CMeasuringInfluence relation f (T);
specifically, T, C in Table I belowMeasuringCorresponding data, using the least squares method, fit the relationship shown in fig. 5:
y＝-0.003x+0.067；
x is the temperature influence value, y is the measured influence value f (T) of difluoromethane (R32) under the influence of temperature,
then: (t) y-0.002 x +0.063, giving the values of f (t) in table one;
s203: to eliminate the influence of temperature, the output concentration value C is equal to CMeasuring-f (t) the value of C in table one is given, C being the difluoromethane (R32) value after elimination of the temperature effect;
s204: the actual water content (humidity) in the air was tested for its effect on the concentration of difluoromethane (R32): according to the reading of the temperature and humidity sensor 40, the actual water content in the air is calculated to be CH2OThe value of the concentration after eliminating the influence of the temperature is C, through C, CH2OFitting a relation between the two groups of test data to obtain an influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32);
specifically, the saturated water content in the air is calculated according to the relationship between the temperature and the saturated water pressure:
t is the temperature value read by the temperature and humidity sensor 40;
d-relative humidity value read by the temperature and humidity sensor 40;
Csaturated H2O-saturated water content in air;
CH2O-the actual water content in the air;
Csaturated H2O＝0.0000008734×t3-0.0000013617×t2+0.000478474×t+0.0068091716
According to the relative humidity d and the saturated water content C in the airSaturated H2OCalculating the actual water content C in the airH2O：
CH2O＝d×CSaturated H2O/100。
Through C in table IH2OC, fitting the data by using a least square methodThe relationship of FIG. 6:
yˊ＝-0.221x′-0.0000；
x 'is the actual water content influence value in air, y' is the measured influence value f (H2O) of difluoromethane (R32) under the influence of the actual water content value in air;
then: y ═ 0.221 x' -0.0000 (H2O);
then: f (H2O) ═ y ═ -0.221 x', values for f (H2O) in table i;
s205: in actual measurement, in order to eliminate the influence of the actual water content in the air, the output concentration value C ═ C-f (H20) ═ CMeasuringF (T) f (H20), and obtaining the value of C 'in the table I, wherein C' is the difluoromethane (R32) value after eliminating the influence of temperature and humidity.
Table one:
the method of this example eliminates the effect of temperature on difluoromethane (R32) concentration before eliminating the effect of actual water content in the air.
Example three:
please refer to fig. 3, which is a flowchart illustrating a method for correcting a difluoromethane (R32) leakage detection value by the difluoromethane (R32) leakage detection apparatus of fig. 1, comprising the following steps:
s301: filling the tested gas difluoromethane (R32);
s302: the actual water content in air was tested for its effect on difluoromethane (R32) concentration: the concentration value of difluoromethane (R32) measured by the ultrasonic sensor is C, and the actual water content in the air is calculated to be C according to the reading of the temperature and humidity sensorH2OThrough CMeasuring、CH2OFitting a relation between the two groups of test data to obtain an influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32);
s303: eliminating the influence of actual water content in air and outputting the concentration value C ═ CMeasuring-f(H20)；
S304: test temperature effect on difluoromethane (R32) concentration: the temperature value measured by the temperature and humidity sensor is T, the concentration value after the influence of the actual water content in the air is eliminated is C, a relational expression between the temperature value and the concentration value is fitted through T, C two groups of test data, and the influence value of the temperature on the concentration of difluoromethane (R32) is f (T);
s305: eliminating the influence of temperature, and outputting concentration value C ═ C-f (T) C ═ CMeasuring-f(H20)-f(T)。
Compared with the method of the second embodiment in the figure 2, the method eliminates the influence value of the actual water content in the air on the concentration of the difluoromethane (R32) and then eliminates the influence value of the temperature.
Of course, the influence value f (T) of the temperature on the concentration of the difluoromethane (R32) and the influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32) can be respectively measured, and the concentration value of the difluoromethane (R32) measured by the ultrasonic sensor is CMeasuringTo eliminate the influence of temperature and actual water content in the air, the output concentration value C ═ CMeasuring-f(H20)-f(T)；
Example four:
please refer to fig. 4, which is a flowchart of a difluoromethane (R32) leakage detection method implemented by the difluoromethane (R32) leakage detection apparatus of fig. 1, comprising the following steps:
s401: according to the LFL (lowest flammable concentration) of the flammable gas, alarm concentration values P of a plurality of levels are set in a difluoromethane (R32) leakage detection device before shipment, for example, alarm concentration values of three levels I, II and III are set, for example, the LFL (lowest flammable concentration) of difluoromethane (R32) is 14.4%, and the I-level alarm concentration value set by the detection device is 10% of the LFL (lowest flammable concentration) of the flammable gas, namely, I is 1.44%; the level II alarm concentration value set by the detection device is 20% of LFL (lowest combustible concentration) of the combustible gas, namely II is 2.88%; the level iii alarm concentration value iii set by the detection device is 25% of LFL (minimum flammable concentration) of the combustible gas, that is, iii is 3.6%.
S402: difluoromethane (R32) leaks the checkout gear and outputs the concentration value (after revising) C ', when the concentration value C ' outputted satisfies 0 ≤ C ' < 1.44%, alarm 60 does not work;
s403: when I is less than or equal to C '< II, namely when 1.44% is less than or equal to C' < 2.88%, the alarm 60 works, the mode is set as first-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment 90 through the communication unit 70 arranged on the circuit board 80, and prompts a user that leakage exists and the mode is first-level alarm, and the user pays attention to precaution;
s404: when II is less than or equal to C '< III, namely when 2.88% is less than or equal to C' < 3.6%, the alarm 60 works, the mode is set as a secondary alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment 90 through the communication unit 70 arranged on the circuit board 80, a user is prompted that leakage exists and the mode is the secondary alarm, intervention and hidden danger elimination need to be carried out within a specified time, the specific communication unit 70 transmits the data to the refrigeration equipment 90, and the refrigeration equipment 90 starts the ventilation device 91 to reduce or eliminate the content of the leaked difluoromethane (R32);
s405: when the value of C '═ iii, that is, when the value of C' ═ 3.6%, the alarm operates, the mode is set to three-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment 90 through the communication unit 70 arranged on the circuit board 80, the user is prompted to leak to reach the set alarm concentration value, at this time, the minimum concentration limit value is reached, meanwhile, the control unit 50 on the circuit board 80 starts the ventilation device 91 at the end of the refrigeration equipment 90, the hidden danger needs to be removed immediately, the specific communication unit 70 transmits the data to the refrigeration equipment 90, and the refrigeration equipment 90 starts the ventilation device 91 to reduce or remove the content of the leaked difluoromethane (R32).
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (9)
1. A method for correcting a detection value of a difluoromethane (R32) leak detection device, wherein the difluoromethane (R32) leak detection device comprises an air chamber, an ultrasonic sensor and a temperature and humidity sensor, the ultrasonic sensor is arranged in the air chamber, the temperature and humidity sensor measures the temperature and humidity in the air chamber, the ultrasonic sensor measures the concentration of difluoromethane in the air chamber and corrects the measured concentration value of difluoromethane according to the temperature and humidity, and the method is characterized in that: the detection value correction method includes the steps of:
s1: filling the tested gas difluoromethane (R32);
s2: test temperature effect on difluoromethane (R32) concentration: the temperature value measured by the temperature and humidity sensor is T, and the concentration value of difluoromethane (R32) measured by the ultrasonic sensor is CMeasuringThrough T, CMeasuringFitting two groups of test data to obtain a relation between the two test data, and obtaining an influence value f (T) of temperature on the concentration of difluoromethane (R32);
s3: eliminating the influence of temperature and outputting the concentration value C ═ CMeasuring-f(T)；
S4: the actual water content in air was tested for its effect on difluoromethane (R32) concentration: according to the reading of the temperature and humidity sensor, the actual water content in the air is calculated to be CH2OThe value of the concentration after eliminating the influence of the temperature is C, through C, CH2OFitting a relation between the two groups of test data to obtain an influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32);
s5: eliminating the influence of actual water content in air and outputting the concentration value C ═ C-f (H20) ═ CMeasuring-f(T)-f(H20)。
2. A detection value correction method of a difluoromethane (R32) leak detection device according to claim 1, wherein: difluoromethane (R32) leaks detection device still includes a circuit board, air chamber, temperature and humidity sensor set up on the circuit board.
3. A detection value correction method of a difluoromethane (R32) leak detection device according to claim 2, wherein: the difluoromethane (R32) leakage detection device also comprises a control unit arranged on the circuit board, wherein the control unit controls the opening or closing of a ventilation device used at a refrigeration equipment end; the circuit board is also provided with a communication unit for communicating with the refrigeration equipment and transmitting data.
4. A detection value correction method of a difluoromethane (R32) leak detection device according to claim 3, wherein: the circuit board is also provided with an alarm for giving a difluoromethane (R32) leakage alarm.
5. A difluoromethane (R32) leak detection value correction method implemented by the difluoromethane (R32) leak detection device according to claim 1, characterized in that: the method comprises the following steps:
s1: filling the tested gas difluoromethane (R32);
s2: the actual water content in air was tested for its effect on difluoromethane (R32) concentration: the concentration value of difluoromethane (R32) measured by the ultrasonic sensor is CMeasuringAccording to the reading of the temperature and humidity sensor, the actual water content in the air is calculated to be CH2OThrough CMeasuring、CH2OFitting a relation between the two groups of test data to obtain an influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32);
s3: eliminating the influence of actual water content in air and outputting the concentration value C ═ CMeasuring-f(H20)；
S4: test temperature effect on difluoromethane (R32) concentration: the temperature value measured by the temperature and humidity sensor is T, the concentration value after the influence of the actual water content in the air is eliminated is C, a relational expression between the temperature value and the concentration value is fitted through T, C two groups of test data, and the influence value of the temperature on the concentration of difluoromethane (R32) is f (T);
s5: eliminating the influence of temperature, and outputting concentration value C ═ C-f (T) C ═ CMeasuring-f(H20)-f(T)。
6. A difluoromethane (R32) leak detection value correction method implemented by the difluoromethane (R32) leak detection device according to claim 1, characterized in that: the method comprises the following steps:
s1: filling the tested gas difluoromethane (R32);
s2: the influence value f (T) of the temperature on the concentration of the difluoromethane (R32) and the influence value f (H20) of the actual water content in the air on the concentration of the difluoromethane (R32) are tested, and the concentration value of the difluoromethane (R32) measured by an ultrasonic sensor is CMeasuringTo eliminate the influence of temperature and the actual water content in the air, the output concentration value C' was measured as-f (H20) -f (t).
7. A difluoromethane (R32) leak detection method implemented by the difluoromethane (R32) leak detection device of claim 4, characterized in that: the method comprises the following steps:
s1: p is an alarm concentration value of difluoromethane (R32), and is arranged in a difluoromethane (R32) leakage detection device before leaving a factory, wherein P is set to be in three levels of I, II and III, I is 10% of the lowest combustible concentration of combustible gas, II is 20% of the lowest combustible concentration of combustible gas, and III is 25% of the lowest combustible concentration of combustible gas;
s2: difluoromethane (R32) leaks the checkout gear and outputs the concentration value C 'after revising, when C' is less than or equal to 0 ≤ I, the alarm does not work;
s3: when I is less than or equal to C' and less than II, the alarm works, the mode is set as first-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is first-level alarm, so as to take care of precaution;
s4: when the II is less than or equal to C' and less than III, the alarm works, the mode is set to be a secondary alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is the secondary alarm, and the user needs to intervene and eliminate hidden danger within a specified time;
s5: when the value C' is III, the alarm works, the mode is set to be three-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through the communication unit arranged on the circuit board, the user is prompted to leak to reach the set alarm concentration value, meanwhile, the control unit on the circuit board starts the air interchanger at the refrigeration equipment end, and the hidden danger needs to be immediately intervened and eliminated.
8. A difluoromethane (R32) leak detection method implemented by the difluoromethane (R32) leak detection device of claim 4, characterized in that: the method comprises the following steps:
s1: filling the tested gas difluoromethane (R32);
s2: testing an influence value f (T) of temperature on the concentration of difluoromethane (R32) and an influence value f (H20) of actual water content in air on the concentration of difluoromethane (R32), wherein the concentration value of difluoromethane (R32) measured by an ultrasonic sensor is C, and in order to eliminate the influence of temperature and actual water content in air, the output concentration value C ═ CMeasuring-f(H20)-f(T)；
S3: p is an alarm concentration value of difluoromethane (R32), and is arranged in a difluoromethane (R32) leakage detection device before leaving a factory, wherein P is set to be in three levels of I, II and III, I is 10% of the lowest combustible concentration of combustible gas, II is 20% of the lowest combustible concentration of combustible gas, and III is 25% of the lowest combustible concentration of combustible gas;
s4: difluoromethane (R32) leaks the checkout gear and outputs the concentration value C 'after revising, when C' is less than or equal to 0 ≤ I, the alarm does not work;
s5: when I is less than or equal to C' and less than II, the alarm works, the mode is set as first-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is first-level alarm, so as to take care of precaution;
s6: when the II is less than or equal to C' and less than III, the alarm works, the mode is set to be a secondary alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through a communication unit arranged on the circuit board, and prompts a user that leakage exists and the mode is the secondary alarm, and the user needs to intervene and eliminate hidden danger within a specified time;
s7: when the value C' is III, the alarm works, the mode is set to be three-level alarm, the difluoromethane (R32) leakage detection device transmits data to the refrigeration equipment through the communication unit arranged on the circuit board, the user is prompted to leak to reach the set alarm concentration value, meanwhile, the control unit on the circuit board starts the air interchanger at the refrigeration equipment end, and the hidden danger needs to be immediately intervened and eliminated.
9. A refrigeration apparatus, characterized by: the refrigeration appliance comprising the difluoromethane leak detection device of claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058686.XA CN107817330B (en) | 2017-11-01 | 2017-11-01 | Detection value correction method and detection method of difluoromethane leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711058686.XA CN107817330B (en) | 2017-11-01 | 2017-11-01 | Detection value correction method and detection method of difluoromethane leakage detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107817330A CN107817330A (en) | 2018-03-20 |
| CN107817330B true CN107817330B (en) | 2020-03-31 |
Family
ID=61603542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711058686.XA Active CN107817330B (en) | 2017-11-01 | 2017-11-01 | Detection value correction method and detection method of difluoromethane leakage detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107817330B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019119347A1 (en) * | 2019-07-17 | 2021-01-21 | Vaillant Gmbh | Method and device for measuring changes in the composition of a liquid in a circuit, in particular a heat pump system |
| CN113640238A (en) * | 2021-08-12 | 2021-11-12 | 鑫益能科技(厦门)有限公司 | System, method, apparatus and medium for detecting energy leakage |
| CN115200181A (en) * | 2022-07-12 | 2022-10-18 | 广东美的暖通设备有限公司 | Refrigerant sensor correction method and air conditioning system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000320937A (en) * | 1999-05-11 | 2000-11-24 | Fuji Electric Co Ltd | Refrigerant leak detection device |
| ES2431956T3 (en) * | 2001-01-22 | 2013-11-28 | Teijin Limited | Equipment and method for ultrasonically measuring the concentration and flow of a gas |
| US20110112814A1 (en) * | 2009-11-11 | 2011-05-12 | Emerson Retail Services, Inc. | Refrigerant leak detection system and method |
| CN103808820B (en) * | 2014-01-09 | 2016-05-11 | 中国人民解放军海军医学研究所 | A kind of Freon gas detection alarm device and detection method thereof |
| CN103837304A (en) * | 2014-02-20 | 2014-06-04 | 上海出入境检验检疫局机电产品检测技术中心 | Combustible refrigerant simulation leakage device and leakage concentration measurement device |
| CN103969327B (en) * | 2014-06-04 | 2016-07-06 | 江南大学 | A kind of ultrasound wave oil smoke concentration sensor |
| CN104089381B (en) * | 2014-06-24 | 2016-12-21 | 珠海格力电器股份有限公司 | Device and method for detecting combustible refrigerant leakage and air conditioner |
-
2017
- 2017-11-01 CN CN201711058686.XA patent/CN107817330B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107817330A (en) | 2018-03-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11118822B2 (en) | Refrigerant leak detection by use of fluid additive | |
| CN107817330B (en) | Detection value correction method and detection method of difluoromethane leakage detection device | |
| Mahalingam et al. | Design and implementation of an economic gas leakage detector | |
| CN203606084U (en) | On-site fast checking system of sulfur hexafluoride gas leakage monitoring device | |
| CN103884480B (en) | Coolant leakage detection method, refrigerant leakage detecting system and air-conditioner | |
| US8418530B1 (en) | Compositions and methods for detecting leaks in HVAC/R systems | |
| US11927354B2 (en) | Method and system for flammable gas detection | |
| CN103335791B (en) | A kind of based on the thin leak hunting method of helium mass spectrum quantitatively determining the longest time inspection time | |
| JP6637702B2 (en) | Air conditioning system | |
| CN104155135A (en) | Device for measuring clean air quantity attenuation rate of air cleaner | |
| CN110715395B (en) | Air conditioner refrigerant leakage detection method and device and air conditioner | |
| CN101893521A (en) | Automotive air conditioner fault detector and fault detecting method | |
| CN104819547A (en) | Fluorine-lacking detection and protection method and system during startup of variable frequency air conditioning system | |
| CN110513825B (en) | Refrigerant leakage detection and control method and system | |
| CN110701726B (en) | Detection method for air conditioner refrigerant leakage | |
| CN103940062B (en) | Electric appliance box and safety control method thereof, and air conditioner adopting combustible refrigerant | |
| CN205090563U (en) | Air conditioning system with refrigerant leaks security alarm device | |
| CN106196419A (en) | A kind of air-conditioning state detection method, device and air-conditioning | |
| CN108519755A (en) | A kind of active safety gas meter, flow meter and its working method | |
| CN110940045A (en) | Air conditioner refrigerant leakage detection method and air conditioner | |
| CN110822653B (en) | Air conditioner refrigerant leakage detection method and air conditioner | |
| CN207196814U (en) | Air conditioner | |
| CN104978827A (en) | Combustible gas detection apparatus enabling alarm threshold to be adjustable | |
| CN203178248U (en) | Measurement device of release and lower explosive limit of household appliance hydrocarbon refrigerant | |
| CN111059695A (en) | Omnibearing detection device and method for detecting refrigerant leakage of air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 430205, No. three, No. 3, Fenghuang garden, Phoenix Industrial Park, East Lake New Technology Development Zone, Hubei, Wuhan Applicant after: Sifang Optoelectronic Co., Ltd. Address before: 430000, No. three, No. 3, Fenghuang garden, Phoenix Industrial Park, East Lake New Technology Development Zone, Hubei, Wuhan Applicant before: Wuhan Cubic Optoelectronics Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |