A method for automatically checking gas safety

Abstract

The present invention discloses a method for automatic gas safety inspection, including: automatic safety inspection; after the automatic safety inspection is passed, it is judged whether the user is using gas normally before the safety inspection, if the gas is used normally, the valve in the gas meter is opened, if the gas is not used normally, the valve in the gas meter is kept closed. The present invention judges whether the user-side pipeline leaks by the pressure difference when the valve inside the gas meter is opened and closed, thereby improving the safety of gas use. And it is determined whether to automatically open the valve after the safety inspection according to the gas use of the user before the safety inspection, thereby reducing the impact of the safety inspection on the user's gas use.

Description

Technical Field

[0001] The invention relates to a method for automatic safety inspection of a gas pipeline. Background Art

[0002] Gas, such as natural gas, is an indispensable energy source for the daily life of urban residents. The existing natural gas supply is generally transported by pipeline. In order to avoid the safety hazards caused by gas leakage, it is necessary to conduct safety inspections on the pipelines. The existing safety inspection function can be integrated into the smart gas meter, and automatic safety inspections can be achieved through automatic control. After the automatic safety inspection is completed, the valve in the meter is closed and needs to be opened manually by the user. However, since the safety inspection is carried out automatically, closing the valve will make users mistakenly think that the gas is cut off, causing trouble to users in use. Summary of the invention

[0003] In view of this, the present invention provides a gas automatic safety inspection method, which can check for leaks in the gas pipelines in the user's home, and after the safety inspection, it can decide whether to open the valve automatically according to the user's gas usage.

[0004] In order to solve the above technical problems, the technical solution of the present invention is to adopt a gas automatic safety inspection method, comprising:

[0005] Automatic security check;

[0006] After the automatic security check is passed, it is determined whether the user is using gas normally before this security check. If it is normal, the valve in the gas meter is opened. If it is not normal, the valve in the gas meter is kept closed.

[0007] As an improvement, the method for determining whether the user uses gas normally includes:

[0008] Monitor the gas pulse after the valve in the gas meter is opened for the last time;

[0009] If no gas pulse is detected at every time period T1, the counter is modified; if a gas pulse is detected, the counter is initialized;

[0010] The counter is compared with the gas usage threshold to determine whether the gas usage is normal.

[0011] As a further improvement, the initial pressure of the counter is 255; the time period T is 1 hour and if no gas pulse is detected every hour, the counter is modified by -1; the gas usage threshold is 225, and if the counter is greater than or equal to 225, it is judged to be normal gas usage.

[0012] As another further improvement, the method of automatic security inspection includes:

[0013] Determine whether the security check interval has been reached. If so, check whether the valve in the gas meter is open.

[0014] If the valve in the gas meter is in the closed state, wait for a period of time T2 before checking again. If the valve in the gas meter is in the open state, test the absolute pressure in the gas meter as the initial pressure;

[0015] Close the valve in the gas meter and wait for a period of time T3. During the waiting period, monitor the flow pulse in the meter. If the flow pulse exceeds the safety threshold, it is judged as unqualified for security inspection;

[0016] After waiting for a period of time T3, if there is no flow pulse or the flow pulse does not exceed the safety threshold, the absolute pressure in the gas meter is tested as the termination pressure;

[0017] The difference between the initial pressure and the final pressure is compared with the leakage threshold to determine whether the security check is qualified.

[0018] As an improvement, the method of comparing the difference between the initial pressure and the end pressure with the leakage threshold to determine whether the security check is qualified is: the leakage threshold is 1kPa, if the difference between the initial pressure and the end pressure is greater than 1kPa, it is judged that the security check is unqualified; if the difference between the initial pressure and the end pressure is less than or equal to 1kPa, it is judged that the security check is qualified.

[0019] As an improvement, the safety threshold is 0.1L.

[0020] As an improvement, the time period T3 is 3 minutes.

[0021] As an improvement, the difference between the initial pressure and the final pressure is displayed on the gas meter display screen after the automatic safety check, and the difference is reported. After reporting, the difference displayed on the gas meter display screen is cleared; if the safety check fails, the reported difference is verified and a clear instruction is sent to the gas meter, so that the gas meter clears the difference displayed on the display screen after receiving the clear instruction.

[0022] The invention is beneficial in that it can judge whether there is leakage in the user-side pipeline by the pressure difference when the valve inside the gas meter is switched, thereby improving the safety of gas use. It can also determine whether to automatically open the valve after the security check based on the gas use of the user before the security check, thereby reducing the impact of the security check on the user's gas use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0025] Existing smart gas meters are generally installed at home, and the smart gas meters are integrated with valves, pressure sensors, wireless transmission modules, and controllers. The safety detection in the present invention is mainly aimed at the air tightness of the pipeline between the smart gas meter and the gas-using equipment in the user's home.

[0026] like Figure 1 As shown, the present invention provides a method for automatic gas safety inspection, comprising:

[0027] S1 Automatic security check; the specific steps of the automatic security check include:

[0028] S11 determines whether the security check interval has been reached. If the security check interval has been reached, it checks whether the valve in the gas meter is open. The interval of automatic security check can be set according to relevant regulations, such as 1 month, 3 months, etc. Therefore, before conducting a security check, it is necessary to first determine whether the prescribed interval has been reached based on the security check record. If the interval has been reached, the next step will be executed, otherwise it will not be executed.

[0029] S12 If the valve in the gas meter is closed, wait for a period of time T2 before checking again. If the valve in the gas meter is open, test the absolute pressure in the gas meter as the initial pressure. The purpose of this step is to determine whether the user's gas facilities are in a normal state by whether the valve is open. Generally speaking, if the user's gas equipment is in an abnormal state, the user will close the valve in the gas meter by himself (the valve in the gas meter is generally the main valve in the user's home). If the valve is closed, it is impossible to judge the state of the gas equipment. If the gas meter opens the valve by itself, a serious safety accident will occur once there is a gas failure. Therefore, in this step, the next step is only executed if the user opens the valve by himself. Otherwise, wait for a period of time T2, such as 1 hour, and then judge the state of the valve.

[0030] If it is detected that the valve is open, the pressure sensor in the pressure gauge is used to test the pressure value in the gas meter as the initial pressure.

[0031] S13 closes the valve in the gas meter and waits for a period of time T3. During the waiting period, the flow pulse in the meter is monitored. If the flow pulse exceeds the safety threshold, it is judged as unqualified for security inspection. In this embodiment, the time period T3 is preferably 3 minutes. If the flow pulse in the meter is monitored to be greater than the safety threshold, such as 0.1L, within 3 minutes, it means that there is a large leakage problem in the pipeline between the gas meter and the gas-using equipment. The gas meter can convert the gas flow into current pulses for recording, and if the leakage in the pipeline can cause the gas meter to record the gas pulse exceeding 0.1L, it is directly considered to be unqualified for safety.

[0032] After S14 waits for a period of time T3, if there is no flow pulse or the flow pulse does not exceed the safety threshold, the absolute pressure in the gas meter is tested as the termination pressure; after waiting for more than the period of time T3, that is, 3 minutes, if the flow pulse does not exceed the safety threshold of 0.1L, the pressure sensor in the gas meter is used to detect the pressure value in the gas meter as the termination pressure.

[0033] S15 compares the difference between the initial pressure and the end pressure with the leakage threshold to determine whether the security check is qualified. Specifically, initial pressure - end pressure = leakage pressure difference. The leakage pressure difference is compared with the leakage threshold such as 1kPa. If the leakage pressure is greater than 1kPa, it is considered that the security check is unqualified. If the leakage pressure is less than or equal to 1kPa, it is considered that the security check is qualified.

[0034] After passing the S2 automatic security check, it is determined whether the user is using gas normally before this security check. If so, the valve in the gas meter is opened; if not, the valve in the gas meter is kept closed.

[0035] In this step, the method for determining whether the user is using it normally includes:

[0036] S21 monitors the gas pulse after the last valve opening in the gas meter; each normal gas usage by the user will generate a gas pulse in the gas meter. Of course, the gas meter cannot know which valve opening is the last, so it will record each time the valve is opened. If the valve is closed, the record will be cleared, and the record will start again when the valve is reopened.

[0037] S22 If no gas pulse is detected in each time period T1, the counter is modified, and if a gas pulse is detected, the counter is initialized; in this embodiment, the time period T1 is preferably 1 hour, and the initial value of the counter is 255. If no gas pulse is detected in 1 hour, the counter is -1 operated, and if a gas pulse is detected, the counter is re-initialized to 255. The purpose of this step is to monitor the time when the user stops using gas before the security check.

[0038] S23 compares the counter with the gas usage threshold to determine whether it is normal gas usage. In this embodiment, the counter value is specifically compared with the gas usage threshold, such as 225. If the counter value is less than 225, it means that the user has not used gas for more than 30 hours, and it is judged as abnormal gas usage and the valve is kept closed. If the counter value is greater than 225, it means that the user has used gas within 30 hours, and it is judged as normal gas usage. After security inspection, the valve is automatically opened to avoid trouble to the user.

[0039] After S3 automatic security check, the difference between the initial pressure and the end pressure is displayed on the gas meter display screen, and the difference is reported. After reporting, the difference displayed on the gas meter display screen is cleared; if the security check fails, the reported difference is verified and a clear instruction is sent to the gas meter, so that the gas meter clears the difference displayed on the display screen after receiving the clear instruction.

[0040] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A method for automatic gas safety inspection, characterized in that include: Automatic security check; The automatic security inspection method comprises: determining whether the security inspection interval has been reached, and if the security inspection interval has been reached, checking whether the valve in the gas meter is open; If the valve in the gas meter is in the closed state, wait for a period of time T2 before checking again. If the valve in the gas meter is in the open state, test the absolute pressure in the gas meter as the initial pressure; Close the valve in the gas meter and wait for a period of time T3. During the waiting period, monitor the flow pulse in the meter. If the flow pulse exceeds the safety threshold, it is judged as unqualified for security inspection; After waiting for a period of time T3, if there is no flow pulse or the flow pulse does not exceed the safety threshold, the absolute pressure in the gas meter is tested as the termination pressure; The difference between the initial pressure and the final pressure is compared with the leakage threshold to determine whether the security inspection is qualified; After the automatic security check is passed, it is determined whether the user is using gas normally before this security check. If it is normal, the valve in the gas meter is opened. If it is not normal, the valve in the gas meter is kept closed.

2. A method for automatic gas safety inspection according to claim 1, characterized in that The method for determining whether the user is using gas normally includes: monitoring the gas pulse after the valve in the gas meter is opened for the last time; If no gas pulse is detected at every time period T1, the counter is modified; if a gas pulse is detected, the counter is initialized; The counter is compared with the gas usage threshold to determine whether the gas usage is normal.

3. A method for automatic gas safety inspection according to claim 2, characterized in that: The initial pressure of the counter is 255; the time period T is 1 hour and if no gas pulse is detected every hour, the counter is modified by -1; the gas usage threshold is 225, and if the counter is greater than or equal to 225, it is judged to be normal gas usage.

4. A method for automatic gas safety inspection according to claim 1, characterized in that The method of comparing the difference between the initial pressure and the end pressure with the leakage threshold to determine whether the security check is qualified is: the leakage threshold is 1kPa, if the difference between the initial pressure and the end pressure is greater than 1kPa, it is judged that the security check is unqualified, if the difference between the initial pressure and the end pressure is less than or equal to 1kPa, it is judged that the security check is qualified.

5. The automatic gas safety inspection method according to claim 1, characterized in that: The safety threshold is 0.1L.

6. A method for automatic gas safety inspection according to claim 1, characterized in that: The time period T2 is 1 hour, and the time period T3 is 3 minutes.

7. A method for automatic gas safety inspection according to claim 1, characterized in that: After the automatic safety check, the difference between the initial pressure and the final pressure is displayed on the gas meter display screen, and the difference is reported. After the report, the difference displayed on the gas meter display screen is cleared; If the security check fails, a clear command is sent to the gas meter after verifying the reported difference, so that the gas meter clears the difference displayed on the display screen after receiving the clear command.

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