A method for reducing false alarms of gas micro-leakage, smart gas meter and system

Abstract

The present invention discloses a method for reducing false alarms of micro-leakage of gas, an intelligent gas meter and a system. The method comprises the following steps: real-time acquisition of rotation data of a counting wheel and conversion of the rotation data into at least one pulse signal; obtaining the time interval T between the ith pulse signal and the i-1th pulse signal; i , where i is greater than or equal to 1; obtain the time interval T within the preset micro-flow leakage range i The single pulse signal of the abnormal pulse signal is accumulated, and all the continuous pulse signals that belong to the preset micro-flow leakage range are accumulated to obtain the cumulative number N of abnormal pulse signals. i ; Determine the cumulative number of abnormal pulse signals N i Is the value greater than the cumulative threshold M for abnormal pulse signals of micro-leakage? The smart gas meter includes a counting wheel, a pulse signal module, a controller module, a valve control module, and a communication module. The smart gas system includes the smart gas meter described above and a remote backend. The present invention achieves a low false alarm rate and high safety performance.

Description

Technical Field

[0001] The present invention relates to the technical field of gas leakage monitoring, and in particular to a method for reducing false alarms of micro-gas leakage, an intelligent gas meter and a system. Background Art

[0002] At present, smart gas meters based on mobile Internet of Things have gradually been installed to actual users. Through remote data transmission and control technology, users can query and pay online. Gas company management personnel can perform remote valve closing protection, gas consumption monitoring, gas volume data analysis and abnormal situation alarm light functions in the background management system, which is conducive to promoting intelligent management of enterprises and improving their management efficiency.

[0003] In environments like kitchens, where high levels of smoke and humidity are common, there's a high risk of gas leaks due to aging hoses, loose gaskets, and rusted steel pipes. Furthermore, rats and unsafe gas usage by operators can also cause gas leaks, leading to serious accidents such as fires, explosions, and poisoning, resulting in casualties and property damage. Existing technologies typically employ catalytic combustion gas leak alarms and magnetic over-flow self-closing valves. However, catalytic combustion gas leak alarms require regular maintenance and have a high false alarm rate. Magnetic over-flow self-closing valves only close when over-flow leaks occur, making them incapable of detecting micro-leaks.

[0004] To solve the above technical problems, smart gas meters control the opening and closing of valves by counting the number of accumulated pulse signals. When the number of accumulated pulse signals exceeds the set threshold, the gas meter sends a valve shutoff instruction, and the backend management system controls the valve to automatically close, thereby protecting the smart gas meter. However, the above technical means still have the following shortcomings:

[0005] (1) When the cumulative pulse signal threshold reaches the design accuracy, due to the user's complex gas usage behavior, such as repeated short-term ignition gas usage, it is extremely easy to generate false alarms, resulting in abnormal gas shut-off of the smart gas meter, affecting the user's gas usage experience;

[0006] (2) In order to reduce false alarms, the cumulative pulse signal threshold is increased without ensuring that the volume of leaked gas is constant. When a micro-leakage accident occurs indoors, the concentration of leaked gas in the kitchen will increase greatly, which will pose a serious safety hazard. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: the present invention provides a method for reducing false alarms of micro-leakage of gas, an intelligent gas meter and a system, so as to achieve the purpose of low false alarm rate and high safety performance.

[0008] In order to achieve the above object, the present invention provides a method for reducing false alarms of gas micro-leakage, which comprises the following steps:

[0009] During the rotation of the counting wheel of the smart gas meter, the rotation data of the counting wheel is collected in real time, and the rotation data is converted into at least one pulse signal;

[0010] Obtain the time interval T between the ith pulse signal and the (i-1)th pulse signal i , where i is greater than or equal to 1;

[0011] Obtain the time interval T that falls within the preset micro-flow leakage range i The single pulse signal, and all the continuous pulse signals that belong to the preset micro-flow leakage range are accumulated to obtain the abnormal pulse signal cumulative number N i ;

[0012] Determine the cumulative number N of abnormal pulse signals i Whether it is greater than the cumulative threshold M of the abnormal pulse signal of micro-flow leakage, wherein the cumulative threshold M of the abnormal pulse signal of micro-flow leakage is adjusted by reducing the gas volume equivalent L0 of the pulse signal. The total volume V of the leaked gas when the valve is closed and the gas volume equivalent L0 of the pulse signal are calculated as follows: V = i·L0, and the total volume V remains unchanged;

[0013] If the abnormal pulse signal cumulative number N i When the value is greater than or equal to the cumulative threshold M of the abnormal pulse signal of the tiny flow leakage, the smart gas meter is controlled to close the built-in valve and send an alarm signal to the relevant department.

[0014] In some embodiments of the present application, the time interval T between the kth pulse signal and the k-1th pulse signal is obtained. k , when the time interval T k When it is within the preset micro-flow leakage range, and the time interval T between the j consecutive pulse signals after the kth pulse signal is j When both are within the preset normal gas flow range, the accumulated number of abnormal pulse signals is subtracted from the preset cumulative number value, wherein the cumulative number value is the difference between two consecutive pulse signals that are within the preset micro-flow leakage range.

[0015] In some embodiments of the present application, the cumulative number value is 1.

[0016] In some embodiments of the present application, the time interval T between two adjacent pulse signals is obtained. i , if the time interval T iLonger than the preset long gas outage time T 长 , then the cumulative number of abnormal pulse signals N i is 0.

[0017] In some embodiments of the present application, the preset long gas outage time T 长 2h.

[0018] To achieve the above objectives, another embodiment of the present invention provides a smart gas meter that reduces false alarms of micro-gas leaks, comprising:

[0019] Counting wheel, used to measure the volume of gas flowing into the gas meter from the pipeline network;

[0020] A pulse signal module, configured to convert the rotation data of the counting wheel into a pulse signal through a data acquisition sensor after the rotation data of the counting wheel reaches a preset value;

[0021] The controller module is used to obtain the time interval T within the preset micro-flow leakage range. i The single pulse signal, and all the continuous pulse signals that belong to the preset micro-flow leakage range are accumulated to obtain the abnormal pulse signal cumulative number N i , and determine the cumulative number N of abnormal pulse signals i Is it greater than the cumulative threshold M of the abnormal pulse signal of micro-flow leakage?

[0022] A valve control module, used to control the flow of gas and shut off the gas;

[0023] Communication module, used to remotely send gas leakage signals to the background management system.

[0024] To achieve the above objectives, another embodiment of the present invention provides an intelligent gas system for reducing false alarms of micro-gas leaks, comprising:

[0025] The smart gas meter for reducing false alarms of micro-leakage of gas as described above is used to determine the cumulative number N of abnormal pulse signals. i Is it greater than the cumulative threshold M of the abnormal pulse signal of micro-flow leakage?

[0026] The remote backend is used to receive the gas leakage signal from the smart gas meter and send the relevant signal to the relevant department.

[0027] The present invention provides a method, smart gas meter, and system for reducing false alarms of micro-gas leaks. Compared with the prior art, the advantages thereof are:

[0028] In the method for reducing false alarms of micro-leakage of gas according to an embodiment of the present invention, when the total volume V of the leaked gas when the corresponding valve is closed remains unchanged, by reducing the gas volume equivalent L0 of a single pulse signal, the number of pulse signals obtained will increase, and the cumulative threshold M of the abnormal pulse signal of micro-flow leakage will also increase. Therefore, the cumulative threshold M of the abnormal pulse signal of micro-flow leakage can well adapt to the micro-flow leakage of gas and the user's repeated short-term ignition and gas use behavior, that is, the cumulative threshold M of the abnormal pulse signal of micro-flow leakage under the gas volume equivalent L0 after the pulse signal is reduced. 实 In this case, the user needs to perform more short ignition gas use behaviors to reach the cumulative threshold M of the abnormal pulse signal of small flow leakage under the gas volume equivalent L0 after the pulse signal is reduced. This not only reduces the probability of false alarms under normal gas use behavior and improves the user's gas use experience, but also ensures that the total volume V of the leaked gas remains unchanged while the gas volume equivalent L0 after the pulse signal is reduced, thereby ensuring the safety of the user's gas use;

[0029] The smart gas meter and system for reducing false alarms of micro-gas leaks according to the embodiments of the present invention also have the advantages of low false alarm rate and high safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 4 is a schematic structural diagram of a smart gas meter according to an embodiment of the present invention.

[0031] Figure 2 Schematic diagram of the structure of the intelligent gas system according to an embodiment of the present invention.

[0032] In the figure, 1. Counting wheel; 2. Pulse signal module; 3. Controller module; 4. Valve control module; 5. Communication module; 6. Remote background. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "top", "bottom", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] First, it should be noted that a gas micro-leak refers to a situation where the gas flow rate is low, lower than the value used under normal conditions. In actual use, smart gas meters may give false alarms for gas micro-leakages. The following explains the principle of false alarms for gas micro-leakages. Assume that the gas volume equivalent corresponding to a single pulse signal is L0, and the cumulative threshold value of the abnormal pulse signal of micro-leakage is M:

[0036] If only the time interval belongs to the micro-flow leakage range, assuming that the micro-flow flow rate q range set by the system is

[0037] A≤q≤B (1)

[0038] Therefore, the micro-flow leakage range U of a single pulse signal time interval T is

[0039]

[0040] If and only if M consecutive time intervals fall within the above range, the gas meter valve is automatically closed and an alarm message is sent.

[0041] If the customer's complex gas usage behavior is taken into account, multiple short-time ignitions are performed within a pulse signal interval, then the calculation formula for the single pulse signal time interval is:

[0042]

[0043] According to formula (3), q i = represents the gas flow rate during each ignition, and t represents the interval between the end of the previous ignition and the start of the next. Since the gas flow rate during normal gas appliance operation is much greater than during a minor leak, the time required to consume the equivalent of one pulse signal during ignition is much shorter than the range of a minor leak. If multiple short bursts of gas usage occur, and t is appropriately sized, it is highly likely that the final T will fall within U. However, if multiple such complex gas usage events cause the cumulative threshold of abnormal minor leak pulse signals to reach M, false alarms will occur during normal gas usage.

[0044] like Figure 1 and 2 As shown, a preferred embodiment of the present invention provides a method for reducing false alarms of micro-leakage of gas, which includes the following steps:

[0045] During the rotation of the counting wheel 1 of the smart gas meter, the rotation data of the counting wheel 1 is collected in real time, and the rotation data is converted into at least one pulse signal;

[0046] Get the time interval T between the i-th pulse signal and the i-1-th pulse signal i , where i is greater than or equal to 1;

[0047] Obtain the time interval T that falls within the preset micro-flow leakage range i The single pulse signal, and all the continuous pulse signals that belong to the preset micro-flow leakage range are accumulated to obtain the abnormal pulse signal cumulative number N i ;

[0048] Determine the cumulative number of abnormal pulse signals N i Whether it is greater than the cumulative threshold M of the abnormal pulse signal of small flow leakage, where the cumulative threshold M of the abnormal pulse signal of small flow leakage is adjusted by reducing the gas volume equivalent L0 of the pulse signal. The formula for the total volume V of the leaked gas when the valve is closed and the gas volume equivalent L0 of the pulse signal is: V = i·L0, and the total volume V remains unchanged;

[0049] If the accumulated number of abnormal pulse signals N i When the abnormal pulse signal accumulation threshold M is greater than or equal to the micro-flow leakage, the smart gas meter is controlled to close the built-in valve and send an alarm signal to the relevant department; if the abnormal pulse signal accumulation number N i When it is less than the cumulative threshold M of the abnormal pulse signal of tiny flow leakage, the smart gas meter will be ventilated.

[0050] Based on the above settings, the method for reducing false alarms of micro-leakage of gas in an embodiment of the present invention, when the total volume V of the leaked gas when the corresponding valve is closed remains unchanged, by reducing the gas volume equivalent L0 of a single pulse signal, the number of pulse signals obtained will increase, and the cumulative threshold M of the abnormal pulse signal of micro-flow leakage will also increase. Therefore, the cumulative threshold M of the abnormal pulse signal of micro-flow leakage can well adapt to the micro-flow leakage of gas and the user's repeated short-term ignition and gas use behavior, thereby reducing the probability of false alarms under normal gas use behavior, improving the user's gas use experience, and improving the safety of gas use.

[0051] Get the time interval T between the kth pulse signal and the k-1th pulse signal k , when the time interval T k When it is within the preset micro-flow leakage range, and the time interval T between the j consecutive pulse signals after the kth pulse signal is j When both are within the preset normal gas flow range, the accumulated number of abnormal pulse signals is subtracted from the preset accumulated number value, wherein the accumulated number value is the difference between two consecutive pulse signals within the preset small flow leakage range. Specifically, when the total volume V of the leaked gas when the corresponding valve is closed remains unchanged, the accumulated threshold value M of the small flow leakage abnormal pulse signal under the gas volume equivalent L0 without reducing the pulse signal is set. 原 The threshold value of the abnormal pulse signal of micro leakage is 3, and the cumulative threshold value of the abnormal pulse signal of micro leakage under the gas volume equivalent L0 after the pulse signal is reduced is M. 实5. When the user has multiple short-term ignition gas behaviors, 实 The number of short-term ignition gas behaviors that occur under the conditions of M is much greater than that under M 原 The number of short-term ignition gas behaviors that occur under the conditions, thus, in M 实 The probability of false alarm under the condition of M is much smaller than that under the condition of 原 The probability of false alarms occurring under certain conditions is reduced, thereby ensuring that users can use gas normally and effectively reducing the probability of false alarms.

[0052] Get the time interval T between two adjacent pulse signals i , if the time interval T i Longer than the preset long gas outage time T 长 , then the cumulative number of abnormal pulse signals N i is 0, specifically, the gas is 长 The flow rate of the gas alarm does not reach the minimum standard of the gas alarm concentration. Considering the dilution of the gas itself and the time, it can be considered that this gas flow is relatively safe, with less safety risks and no safety accidents will occur. It can be regarded as the gas in the time interval T 长 In the state of gas stop; here T 长 Refer to the setting range of the national standard for gas alarm concentration and set T 长 2h.

[0053] In some embodiments, the accumulated number of times is optionally 1, so that the accumulated number of abnormal pulse signals N is i The acquisition.

[0054] To achieve the above purpose, if Figure 1 As shown, another embodiment of the present invention proposes an intelligent gas meter for reducing false alarms of gas micro-leakages, which includes a counting wheel 1, a pulse signal module 2, a controller module 3, a valve control module 4, and a communication module 5. The counting wheel 1 is used to measure the volume data of the gas flowing into the gas meter from the pipeline network; the pulse signal module 2 is used to convert the rotation data of the counting wheel 1 into a pulse signal through a data acquisition sensor after the rotation data of the counting wheel 1 reaches a preset value; the controller module 3 is used to obtain the time interval T within the preset micro-leakage range. i The single pulse signal, and all the continuous pulse signals that belong to the preset micro-flow leakage range are accumulated to obtain the abnormal pulse signal cumulative number N i , and determine the cumulative number N of abnormal pulse signals i Is it greater than the cumulative threshold M of the abnormal pulse signal of tiny flow leakage? The valve control module 4 is used to control the flow in and out of gas; the communication module 5 is used to remotely send the gas leakage signal to the background management system.

[0055] Based on this, in the embodiment of the present invention, the rotation of the counting wheel 1 corresponds to the pulse signal module 2. For example, the pulse signal module 2 outputs a pulse signal every time the counting wheel 1 rotates one circle or every time it rotates a certain angle.

[0056] The number of pulse signals outputted by the pulse signal module 2 each time should be fixed and the same. Preferably, it can be set to output one pulse signal each time, expressed as an integer multiple, and the integer multiple is preferably 1;

[0057] The controller module 3 may be one of an MCU, FPGA, CPLD, DSP, and ARM. The internal storage medium stores the relevant program for implementing the method for reducing false alarms of micro-gas leaks according to the embodiment of the present invention. The relevant program includes the setting of a cumulative threshold M for abnormal pulse signals of micro-flow leakage. The cumulative threshold M for abnormal pulse signals of micro-flow leakage is adjusted by reducing the gas volume equivalent L0 of the pulse signal. The formula corresponding to the total volume V of the leaked gas when the valve is closed and the gas volume equivalent L0 of the pulse signal is: V = i·L0. The total volume V remains unchanged, thereby increasing the cumulative threshold M for abnormal pulse signals. The controller module 3 acquires the pulse signal transmitted by the pulse signal module 2 in real time, and simultaneously records the time intervals between a preset number of pulse signals. Based on the time intervals, the gas flow information within this time period is obtained. The flow rate refers to the volume of fluid flowing through the effective cross-section of a closed pipe or open channel per unit time.

[0058] The valve control module 4 can control the flow and shutoff of gas. In the prior art, the valve control module 4 is generally controlled based on whether the user has paid the gas fee. In the embodiment of the present invention, the valve control module 4 is controlled by judging the cumulative number N of abnormal pulse signals. i Whether it is greater than the cumulative threshold M of the abnormal pulse signal of micro-flow leakage is used to control the flow and shutoff of gas, thereby ensuring the gas safety of users and improving their gas experience;

[0059] The communication module 5 is used to establish a communication connection with the gas company's remote background 6 so that the remote background 6 can quickly obtain the corresponding abnormal information and locate the specific address, thereby facilitating the control of gas supply and shutoff, and informing users of relevant dangers.

[0060] To achieve the above purpose, if Figure 2 As shown, another embodiment of the present invention provides an intelligent gas system for reducing false alarms of micro-gas leaks, which includes:

[0061] As mentioned above, the smart gas meter for reducing false alarms of micro-leakage of gas is used to judge the cumulative number N of abnormal pulse signals. i Is it greater than the cumulative threshold M of the abnormal pulse signal of micro-flow leakage?

[0062] The remote backend 6 is used to receive the gas leakage signal from the smart gas meter and send the relevant signal to the relevant department.

[0063] Based on this, in the embodiment of the present invention, the remote background 6 is used to receive the relevant gas leakage signal sent by the smart gas meter, and then send corresponding information to the user according to the specific situation of the signal; specifically, the accumulated number of abnormal pulse signals N i When the abnormal pulse signal accumulation threshold M is greater than or equal to the micro-flow leakage, the smart gas meter is controlled to close the built-in valve and send an alarm signal to the relevant department; if the abnormal pulse signal accumulation number N i When the value is less than the cumulative threshold M for abnormal pulse signals of tiny flow leakage, the smart gas meter is ventilated. In addition, the remote backend 6 also facilitates the integrated and unified processing of gas leaks, effectively reducing the overall operating costs of the smart gas system.

[0064] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for reducing false alarms of gas micro-leakage, characterized in that: The following steps are involved: During the rotation of the counting wheel of the smart gas meter, the rotation data of the counting wheel is collected in real time, and the rotation data is converted into at least one pulse signal; Obtain the time interval T between the ith pulse signal and the (i-1)th pulse signal i , where i is greater than or equal to 1; Obtain the time interval T that falls within the preset micro-flow leakage range i The single pulse signal, and all the continuous pulse signals that belong to the preset micro-flow leakage range are accumulated to obtain the abnormal pulse signal cumulative number N i ; Determine the cumulative number N of abnormal pulse signals i Whether it is greater than a cumulative threshold M of a tiny flow leakage abnormal pulse signal, wherein the cumulative threshold M of a tiny flow leakage abnormal pulse signal is adjusted by reducing the gas volume equivalent L0 of the pulse signal. The formula corresponding to the total volume V of the leaked gas that causes the valve to close and the gas volume equivalent L0 of the pulse signal is: V = i·L0, and the total volume V remains unchanged; If the abnormal pulse signal cumulative number N i When the value is greater than or equal to the cumulative threshold M of the abnormal pulse signal of the tiny flow leakage, the smart gas meter is controlled to close the built-in valve and send an alarm signal to the relevant department.

2. The method for reducing false alarms of micro-gas leaks according to claim 1, characterized in that: Obtain the time interval T between the kth pulse signal and the k-1th pulse signal k , when the time interval T k When it is within the preset micro-flow leakage range, and the time interval T between the j consecutive pulse signals after the kth pulse signal is j When both are within the preset normal gas flow range, the accumulated number of abnormal pulse signals is subtracted from the preset cumulative number value, wherein the cumulative number value is the difference between two consecutive pulse signals that are within the preset micro-flow leakage range.

3. The method for reducing false alarms of micro-gas leaks according to claim 2, characterized in that: The cumulative number value is 1.

4. The method for reducing false alarms of micro-gas leaks according to claim 1, characterized in that: Get the time interval T between two adjacent pulse signals i , if the time interval T i Longer than the preset long gas outage time T 长 , then the cumulative number of abnormal pulse signals N i is 0.

5. The method for reducing false alarms of micro-gas leaks according to claim 4, characterized in that: The preset long gas outage time T 长 2h.

6. A smart gas meter that reduces false alarms of micro-leakage of gas, characterized in that: include: Counting wheel, used to measure the volume of gas flowing into the gas meter from the pipeline network; A pulse signal module, configured to convert the rotation data of the counting wheel into a pulse signal through a data acquisition sensor after the rotation data of the counting wheel reaches a preset value; The controller module is used to obtain the time interval T within the preset micro-flow leakage range. i The single pulse signal, and all the continuous pulse signals that belong to the preset micro-flow leakage range are accumulated to obtain the abnormal pulse signal cumulative number N i , and determine the cumulative number N of abnormal pulse signals i Is it greater than the cumulative threshold M of the abnormal pulse signal of micro-flow leakage? A valve control module, used to control the flow of gas and shut off the gas; Communication module, used to remotely send gas leakage signals to the background management system.

7. An intelligent gas system for reducing false alarms of gas micro-leakages, characterized in that: include: The smart gas meter for reducing false alarms of micro-leakage of gas according to claim 6 is used to determine the cumulative number N of abnormal pulse signals i Is it greater than the cumulative threshold M of the abnormal pulse signal of micro-flow leakage? The remote backend is used to receive the gas leakage signal from the smart gas meter and send the relevant signal to the relevant department.

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