CN115841737B - Gas safety monitoring method and device constructed on gas cutting-off device - Google Patents
Gas safety monitoring method and device constructed on gas cutting-off device Download PDFInfo
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Abstract
The invention provides a gas safety monitoring method and a device thereof constructed on a gas cutting device, which solve the technical problem that the prior gas safety monitoring product has false alarm or false operation event and affects user experience, wherein the device comprises a cutting unit, an alarm unit and a pressure monitoring unit, and the alarm unit is respectively connected with the cutting unit and the pressure monitoring unit; the cutting-off unit and the pressure monitoring unit are both arranged on the gas pipeline. The invention can be widely applied to the technical field of gas pipeline safety monitoring.
Description
Technical Field
The present invention relates to a gas safety monitoring device, and more particularly, to a gas safety monitoring method and device constructed on a gas shut-off device.
Background
The domestic gas safety is related to thousands of families and is always widely paid attention to the industry. At present, various safety monitoring products are used in domestic markets, such as an alarm cutting device, a self-closing valve in front of a kitchen range, an overflow valve, a timing valve closing device and the like, the equipment principles and functions are different, and the user experience is required to be improved.
Disclosure of Invention
Aiming at the technical problems that the prior gas safety monitoring product has false alarm or false operation event and affects the user experience, the invention provides a gas safety monitoring method and a device thereof which can effectively monitor gas leakage and accurately act and are constructed on a gas cutting device.
The technical scheme of the invention is that the gas safety monitoring device constructed on the gas cutting device is provided with a gas pipeline, a cutting unit, an alarm unit and a pressure monitoring unit; the alarm unit is provided with an MCU processor; the gas pipeline is provided with a gas meter, the cutting-off unit is arranged on the gas pipeline at the front end of the gas meter, and the pressure monitoring unit is arranged on the pipeline at the rear end of the gas meter; the alarm unit is respectively connected with the cutting-off unit and the pressure monitoring unit; the pressure monitoring unit is used for monitoring the pressure of a medium in the pipeline, transmitting a pressure signal to the alarm unit, analyzing and processing the pressure signal by the alarm unit, and judging and controlling the safety of the gas utilization system; the alarm unit controls the cutting unit to cut off the gas pipeline by monitoring that the concentration of the combustible gas reaches an alarm threshold value or by monitoring that one of a pressure change rate range, a flow range (forbidden zone) and a flow change amount range exceeds a threshold value.
Preferably, the alarm unit is provided with a leak detector for monitoring whether combustible gas components exist in the environment; the MCU processor is used for processing the electric signals obtained by the leakage detector and converting the electric signals into combustible gas concentration values.
The invention also provides a gas safety monitoring method of the safety monitoring device, which comprises the following steps: monitoring whether methane components exist in the space environment through a leakage detector of the alarm unit, and controlling a cutting unit to cut off a gas pipeline if the methane concentration in the space environment exceeds a threshold value; and (II) after the fuel gas pipeline is cut off, if the pressure monitoring unit monitors that the change rate of the absolute pressure of the medium in the pipeline is smaller than the judging threshold value EPa/second, judging that the pipeline at the front end of the cutting unit is leaked, and otherwise, judging that the pipeline at the rear end of the cutting unit is leaked.
The invention also provides a gas safety monitoring method of the safety monitoring device, which comprises the steps of monitoring the pressure and the temperature of a medium through the pressure monitoring unit after cutting off a gas pipeline, analyzing the change condition of the pressure and the temperature of the medium on a time axis through the MCU processor, checking the gas tightness of the system, and checking the closing performance of the cutting unit, wherein the method comprises the following steps of: the absolute pressure and temperature of the medium measured in the initial measurement state are P 1 、T 1 The absolute pressure and temperature of the medium measured in the subsequent measurement state are P 2 、T 2 Then: (A) If P 1 /T 1 = P 2 /T 2 The system has good air tightness, and the cutting unit has no internal leakage; (B) If P 1 /T 1 ＞P 2 /T 2 The system is indicated to have leakage and needs security inspection; (C) If P 1 /T 1 ＜ P 2 /T 2 Indicating that the shut-off valve is not tightly closed and that the shut-off valve needs to be replaced.
The invention also provides a gas safety monitoring method of the safety monitoring device, the gas meter adopts a membrane type gas meter, the MCU processor identifies the flow and the gas consumption of the gas by processing the pressure signal at the rear end of the membrane type gas meter obtained by the pressure monitoring unit, and the method comprises the specific steps of: setting the sampling frequency as M, and sampling to obtain a time sequence A; (II) processing A sequence data and setting long window T 1 There are 2N+1 absolute pressure elements, let element mean be a, let element n+1 minus a be the leading B of new sequence B 1 Sliding a fixed-length window, and moving one sampling data each time, wherein the sampling data are absolute pressure values, and b2 and b3 … … bi … … are sequentially obtained; (III) establishing Sigma b i When s b are found i Is a positive value, and is a positive value,
is also positive, and continues to monitor sigma b i When finding->
If the value is greater than the set threshold b, the Sigma b is continuously monitored i Until +.>
Less than or equal to alpha, and at the moment, recording as a cycle number of the meter; s, b and alpha are threshold values, s is determined according to the equipment measuring range and the revolution volume, b is related to the structure and the pressure loss of the meter, and alpha is related to the sensor noise; (IV) find +.>
And (3) the step (III) is repeated with q+1 as a new starting point and the monitoring and statistics of the cycle number are completed in turn; on the basis, obtaining flow and gas consumption; and fifthly, on the basis of acquiring the cycle number of the membrane type gas meter, identifying, controlling and judging whether to cut off the gas pipeline or not by identifying and controlling the abnormal flow, wherein the specific steps are as follows: (5.1) taking a fixed-length time window T 2 Statistics window T 2 Cycle number in windowWhen the cycle number of the gas consuming device is greater than the threshold C (according to the power setting of the gas consuming device), the minimum value C is reserved 1 And maximum C 2 The method comprises the steps of carrying out a first treatment on the surface of the Or when the number of cycles in the window is greater than zero and less than or equal to a threshold F, the MCU processor controls the cutting-off unit to cut off the gas pipeline; after the gas pipeline is cut off, if the pressure monitoring unit monitors that the change rate of the absolute pressure of the medium in the pipeline is larger than a judging threshold value, judging that leakage (seepage) occurs in the pipeline at the rear end of the diaphragm gas meter; (5.2) obtaining D C's over D days 1 、C 2 After that, take out C 1min And C 2max Form [ C, C ] 1min ) And (C) 2max The table has maximum range of 1.2]Two sections are taken as forbidden sections of the flow; (5.3) when C 1 、C 2 When the measurement is not available, taking (C, with the maximum measuring range of 1.2) as an forbidden region; and (5.4) when the monitored cycle number falls into the forbidden zone, the MCU processor controls the cutting-off unit to cut off the gas pipeline.
The invention has the beneficial effects that:
(1) According to the invention, the cutting unit and the pressure monitoring unit are respectively arranged on the pipelines at the front end and the rear end of the gas meter, so that the cutting unit is close to the public pipeline, and the protection range of the cutting unit is enlarged; the split type design solves the problems that the service lives of the cutting unit and the pressure monitoring unit are long and the service life of the alarm unit is short, and the cutting unit and the pressure monitoring unit do not need to be replaced at the same time when the alarm unit is replaced, so that the purposes of saving resources and saving cost are achieved. According to the invention, the pressure monitoring unit is arranged at the rear end of the diaphragm gas meter to achieve the purposes of monitoring pressure and monitoring the flow and gas consumption of the diaphragm gas meter, and in the actual use process of a user, a flow interval of the user in normal use is obtained through a machine learning method, abnormal flow overflowing the normal interval is managed and controlled, the purpose of flow safety management is achieved, and the purposes of pressure safety monitoring and safety management are achieved through setting an undervoltage protection threshold value;
(2) The invention judges the rate of change of pressure by cutting off the gas pipeline, achieves the purpose of judging the leakage part, and timely sends out a correct alarm signal for the leakage occurring at the upstream of the cutting-off unit;
(3) The invention can find the leakage quantity which can not be detected by the leakage detector in time through micro leakage monitoring and judgment, thereby achieving the purpose of carrying out on-line safety inspection on the system.
Drawings
Fig. 1 is a schematic layout view of a gas safety monitoring device in embodiment 1 of the present invention.
The symbols in the drawings illustrate:
1. a cutting unit; 2. a pressure monitoring unit; 3. a leak detector; 4. an MCU processor; 5. a power module; 6. an alarm unit; 7. a gas meter; 8. a gas cooker.
Detailed Description
The invention is further described below with reference to examples.
Example 1
As shown in fig. 1, a gas safety monitoring device constructed on a gas shut-off device is provided with a gas pipeline, a shut-off unit 1, an alarm unit 6 and a pressure monitoring unit 2; the alarm unit 6 is provided with an MCU processor 4; the gas pipeline is provided with a gas meter 7, the cutting-off unit 1 is arranged on the gas pipeline at the front end of the gas meter 7, and the pressure monitoring unit 2 is arranged on the pipeline at the rear end of the gas meter 7; the alarm unit 6 is respectively connected with the cutting unit 1 and the pressure monitoring unit 2; the pressure monitoring unit 2 is used for monitoring the pressure of a medium in a pipeline, transmitting a pressure signal to the alarm unit 6, analyzing and processing the pressure signal by the alarm unit 6, and judging and controlling the safety of the gas utilization system; the alarm unit 6 controls the shut-off unit 1 to shut off the gas line by monitoring that the concentration of the combustible gas reaches an alarm threshold, or by monitoring that one of a pressure change rate range, a flow rate range, and a flow rate change range exceeds a threshold.
Example 2
The embodiment provides a gas safety monitoring method constructed on a gas cutting device, wherein the gas safety monitoring device constructed on the gas cutting device is used, besides the structure in the embodiment 1, a leakage detector 3 is also arranged, and the leakage detector 3 is used for monitoring whether combustible gas components exist in the environment; the MCU processor 4 is configured to process the electrical signal obtained by the leak detector 3 and convert the electrical signal into a flammable gas concentration value.
The method specifically comprises the following steps: monitoring the spatial environment for the presence of methane components by means of a leak detector 3 of an alarm unit 6, the alarm unit 6 controlling the shut-off unit 1 to shut-off the gas line if the ambient methane concentration is found to exceed a threshold value (e.g. 10 LEL); and (II) after the fuel gas pipeline is cut off, if the pressure monitoring unit 2 monitors that the change rate of the absolute pressure of the medium in the pipeline is smaller than the judging threshold value EPa/second, judging that the pipeline at the front end of the cutting unit 1 is leaked, and otherwise, judging that the pipeline at the rear end of the cutting unit 1 is leaked. The method for correctly judging the leakage position has great guiding significance for accident disposal.
The method for determining the E value is as follows: the kitchen area is 4 square meters, the layer height is 2.5m, the explosion limit of methane is 4.8%, the total methane amount corresponding to 10LEL is 48L, the membrane type gas meter volume is 2L, the pipeline volume is ignored, the pipeline pressure is calculated according to 48L when the leakage amount of 10 hours reaches 100000pa, and E=48/10/3600/2×100000 approximately 66pa/s.
Example 3
The present embodiment relates to another gas safety monitoring method constructed on a gas shutoff device, which uses the gas safety monitoring device constructed on a gas shutoff device in embodiment 1, wherein after shutting off a gas line (unlike embodiment 2, the operation of shutting off the gas line in this embodiment is an artificial active operation, irrespective of the leak detector 3 in embodiment 2), the pressure and temperature of the medium are monitored by the pressure monitoring unit 2, the pressure and temperature change of the medium on the time axis is analyzed by the MCU processor 4, the gas tightness of the system is checked, and the shutting-off performance of the shutoff unit 1 is checked, the method is as follows:
the absolute pressure and temperature of the medium measured in the initial measurement state are P 1 、T 1 The absolute pressure and temperature of the medium measured in the subsequent measurement state are P 2 、T 2 Then:
1) If P 1 /T 1 = P 2 /T 2 The system has good air tightness, and the cutting unit has no internal leakage;
2) If P 1 /T 1 ＞P 2 /T 2 The system is indicated to have leakage and needs security inspection;
3) If P 1 /T 1 ＜ P 2 /T 2 It is explained that the shut-off unit 1 is not tightly closed and that the shut-off unit 1 needs to be replaced.
The time interval of measurement may be determined according to the system scale, and the resident user may select 10 to 30 minutes.
Example 4
The present embodiment relates to still another gas safety monitoring method built on a gas shutoff device using the gas safety monitoring device built on a gas shutoff device in embodiment 1. In this embodiment, the gas meter 7 needs to adopt a diaphragm gas meter, and the MCU processor 4 recognizes the flow and the gas consumption of the gas by processing the pressure signal at the rear end of the diaphragm gas meter obtained by the pressure monitoring unit 2, and the specific method and the steps are as follows:
sampling an absolute pressure value, setting the sampling frequency as M, and obtaining a time sequence A by sampling;
(II) processing A sequence data and setting long window T 1 There are 2N+1 elements, which are absolute pressure values, with element mean value being a, and the n+1 element minus a being the leading B of the new sequence B 1 Sliding a fixed-length window, and moving one sampling data at a time to sequentially obtain b2 and b3 … … bi … …;
(III) establishing Sigma b i When s b are found i Is a positive value, and is a positive value,
is also positive, and continues to monitor sigma b i When finding out
If the value is greater than the set threshold b, the Sigma b is continuously monitored i Until +.>
Less than or equal to alpha, and at the moment, recording as a cycle number of the meter; s, b and alpha are threshold values, s is determined according to the equipment measuring range and the revolution volume, b is related to the structure and the pressure loss of the meter, and alpha is related to the sensor noise;
(IV) each time find
And (3) the step (III) is repeated with q+1 as a new starting point and the monitoring and statistics of the cycle number are completed in turn; on the basis, obtaining flow and gas consumption;
flow = 1 x gear factor x q/M/3600;1 represents a period, the gear coefficient is a parameter of a diaphragm gas meter, q is the number of pressure sampling points in the period, M is the sampling frequency, 3600 is time 3600 seconds, and the obtained flow unit is M/h; air consumption = cycle number x gear coefficient; gear ratio = gear ratio x revolution volume/0.8/1000;
(V) on the basis of obtaining the cycle number of the membrane type gas meter, the abnormal flow is obtained by the following method
The method comprises the following steps of:
(5.1) taking a fixed-length time window T 2 Statistics window T 2 Cycle number in window, when the cycle number in window is greater than threshold value C (according to the power setting of the gas-consuming device), the minimum value C is reserved 1 And maximum C 2 The method comprises the steps of carrying out a first treatment on the surface of the Or when the number of cycles in the window is greater than zero and less than or equal to a threshold value F, the MCU processor 4 controls the cutting-off unit 1 to cut off the gas pipeline; after the gas pipeline is cut off, if the pressure monitoring unit 2 monitors that the change rate of the absolute pressure of the medium in the pipeline is larger than a judging threshold value, judging that leakage (seepage) occurs in the pipeline at the rear end of the diaphragm gas meter; for example, the threshold C determination method is as follows: the gas stove 8 uses a single-piece double-hole stove, the maximum flow is less than 1200L/h, for example, the revolution volume of a diaphragm gas meter is 1.2L, the fixed-length window is 6min, and at the moment, C can be taken: 1200 ≡1.2 ≡10=100; the threshold value F is determined as follows: no matter the water heater is a kitchen range or a wall-mounted boiler, when the flow is lower than 36L/h, the water heater cannot be supportedThe combustion is supported, the flow rate lower than 24L/h can be regarded as leakage, and F can be taken: 24 ≡1.2 ≡10=2;
(5.2) obtaining D C's over D days 1 、C 2 After that, take out C 1min And C 2max Form [ C, C ] 1min ) And (C) 2max The table has maximum range of 1.2]Two sections are taken as forbidden sections of the flow;
(5.3) when C 1 、C 2 When the measurement is not available, taking (C, with the maximum measuring range of 1.2) as an forbidden region;
(5.4) when the cycle number is monitored to fall into the forbidden zone, the MCU processor 4 controls the cutting-off unit 1 to cut off the gas pipeline.
Example 5
For the alarm unit 6, the method for controlling the shut-off unit 1 to shut off the gas pipeline by monitoring that the flow variation range exceeds the threshold value is as follows:
setting a long time window T 3 The cycle number sequence in the internal is c 1 、c 2 、c 3 …c i … … let β=c i -c i-1 The maximum value of beta is always reserved, and beta is obtained after D days of iteration max In beta form max As a threshold, when β=c is found i -c i-1 Greater than beta max And when the flow variation range exceeds the threshold value, alarming is sent out.
Through implementation of the technical scheme, the requirements of the specification regulations of the safety device capable of cutting off gas supply to the kitchen range when the pipeline pressure is lower than a limit value or the flow rate of the pipeline connected with the kitchen range is higher than the limit value can be met in the specification of gas engineering project (GB 55009-2021) 6.1.9. Pressure ranges exceeding a threshold value are exemplified by: 1. the medium gauge pressure is larger than 4000pa, the duration is 20s, and the valve closing alarm is carried out; 2. the medium gauge pressure is less than 1200pa, the duration is 20s, and the valve closing alarm is carried out.
The invention fully excavates the hardware resources of the cutting-off unit, adds the pressure monitoring unit 2 on the gas pipeline, combines the alarm unit 6, and applies the semiconductor and informatization technology to provide safety service and safety guarantee for users. The system of the invention covers all safety functions of the alarm cutting device, the self-closing valve and the overcurrent valve, and also realizes the functions of intelligent security check, intelligent centralized meter reading and intelligent flow safety management, has low cost, long service life, high accuracy, stable performance and high intelligent degree, and can realize zero false alarm and zero missing alarm of leakage monitoring.
However, the foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention are intended to fall within the scope of the claims.
Claims (1)
1. The gas safety monitoring method using the safety monitoring device is characterized in that the safety monitoring device is provided with a gas pipeline, a cutting-off unit, an alarm unit and a pressure monitoring unit; the gas pipeline is provided with a gas meter, the alarm unit is provided with an MCU processor, the pressure monitoring unit is arranged on a pipeline at the rear end of the gas meter, the gas meter adopts a membrane type gas meter, the MCU processor identifies the flow and the gas consumption of gas by processing a pressure signal at the rear end of the membrane type gas meter obtained by the pressure monitoring unit, and judges whether to cut off the gas pipeline by identifying and controlling abnormal flow, and the specific steps are as follows:
setting the sampling frequency as M, and sampling to obtain a time sequence A;
(II) processing A sequence data and setting long window T 1 There are 2N+1 elements in it, let element mean be a, let element n+1 minus a be the leading B of new sequence B 1 Sliding a fixed-length window, and moving one sampling data at a time to sequentially obtain b2 and b3 … … bi … …;
(III) establishing Sigma b i When s b are found i Is a positive value, and is a positive value,
is also positive, and continues to monitor sigma b i When finding->
If the value is greater than the set threshold b, the Sigma b is continuously monitored i Until +.>
Less than or equal to alpha, and at the moment, recording as one period of the meter; s, b and alpha are threshold values, s is determined according to the equipment measuring range and the revolution volume, b is related to the structure and the pressure loss of the meter, and alpha is related to the sensor noise;
(IV) each time find
And (3) the step (III) is repeated with q+1 as a new starting point and the monitoring and statistics of the cycle number are completed in turn; on the basis, obtaining flow and gas consumption;
and fifthly, on the basis of acquiring the cycle number of the membrane type gas meter, judging whether to cut off the gas pipeline or not by identifying and controlling the abnormal flow, wherein the specific steps are as follows:
(5.1) taking a fixed-length time window T 2 Statistics window T 2 Number of cycles in the window, when the number of cycles in the window is greater than the threshold C, the minimum value C is reserved 1 And maximum C 2 ；
Or when the number of cycles in the window is greater than zero and less than or equal to a threshold F, the MCU processor controls the cutting-off unit to cut off the gas pipeline; after the gas pipeline is cut off, if the pressure monitoring unit monitors that the change rate of the absolute pressure of the medium in the pipeline is larger than a judging threshold value, judging that the pipeline at the rear end of the diaphragm gas meter is leaked;
(5.2) obtaining D C's over D days 1 、C 2 After that, take out C 1min And C 2max Form [ C, C ] 1min ) And (C) 2max The table has maximum range of 1.2]Two sections are taken as forbidden sections of the flow;
(5.3) when C 1 、C 2 When the measurement is not available, taking (C, with the maximum measuring range of 1.2) as an forbidden region;
and (5.4) when the monitored cycle number falls into the forbidden zone, the MCU processor controls the cutting-off unit to cut off the gas pipeline.
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Effective date of registration: 20230925 Address after: 264209 room b221, innovation and entrepreneurship base, No. 213-3, Torch Road, torch high tech Industrial Development Zone, Weihai City, Shandong Province Patentee after: Shandong Zhuocheng Intelligent Technology Co.,Ltd. Patentee after: Sichuan Dezheng Zhuoyuan Technology Co.,Ltd. Address before: Room b221, innovation and entrepreneurship base, 213-3 Torch Road, torch hi tech Industrial Development Zone, Weihai City, Shandong Province, 264200 Patentee before: Shandong Zhuocheng Intelligent Technology Co.,Ltd. |
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