Gas safety system with flow monitoring function

Abstract

The invention discloses a fuel gas safety system with a flow monitoring function, which belongs to the technical field of fuel gas safety, and comprises a pipeline fuel gas flow monitoring cut-off module which comprises a cut-off valve, a flow sensor, a pressure sensor and a chip, the pipeline gas flow monitoring and cutting-off module is mounted on a gas pipeline, is positioned between a gas meter and a cooking bench, and is used for identifying a gas use state; the combustible gas detection module is installed above the cooking bench and used for monitoring the gas leakage state in real time; the personnel detection module is mounted at a position close to the cooking bench and is used for detecting a human body; and the internet-of-things communication module is in communication connection with the pipeline gas flow monitoring and cutting module, the combustible gas detection module and the personnel detection module. The gas consumption state can be effectively detected, the conditions of gas leakage, abnormal gas consumption and the like can be found in time, and the safety of gas use is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas safety technology, in particular to a gas safety system with flow monitoring function. BACKGROUND

[0002] During the use of gas stoves, gas explosions, poisoning and other accidents caused by gas leakage often occur, therefore, gas safety systems are equipped when gas stoves are used.

[0003] A Chinese patent with publication number CN108958096A discloses a kitchen gas safety system and safety control method, which comprises a gas sensor, an electric control valve, a first wireless communication component and a control component; the gas sensor is used to detect the gas concentration; the electric control valve is used to open and close the gas pipeline according to the instruction; the control component is used to send the instruction to the electric control valve according to the gas concentration detected by the gas sensor; and the first wireless communication component is used for data transmission between the gas sensor, the electric control valve and the control component. However, this scheme can only detect whether the flammable gas leaks, and only has a simple on-off function, and cannot monitor the gas flow in real time, so it is difficult to effectively detect the gas use state and cannot timely find abnormal gas use conditions such as gas leakage and large-flow gas leakage caused by pipeline damage.

[0004] In addition, some gas safety equipment using infrared detection devices is used to detect whether a person leaves the stove, and further judges the safety of gas use according to the presence or absence of the human body, and when the stove is on but no one is in charge, an alarm is sent in time or corresponding measures are taken. However, such devices are easily disturbed by flames, and may produce false judgments when the stove is ignited or the flame is unstable, resulting in device malfunction and affecting normal use of users. SUMMARY

[0005] The present application aims to provide a gas safety system with flow monitoring function to solve the problem that the existing gas safety system cannot timely find abnormal gas use conditions.

[0006] The technical solution of the present application to solve the above technical problems is as follows:

[0007] A gas safety system with flow monitoring function, comprising:

[0008] A pipeline gas flow monitoring and cutting module, which comprises a cutting valve, a flow sensor, a pressure sensor and a chip, is installed on the gas pipeline and located between the gas meter and the stove, and is used to identify the gas use state;

[0009] A combustible gas detection module is installed above the cooking table and is in communication connection with the pipeline gas flow monitoring and cutting-off module, for real-time monitoring of gas leakage state;

[0010] A personnel detection module is installed near the cooking table and is in communication connection with the pipeline gas flow monitoring and cutting-off module, for detection of human body;

[0011] An IOT communication module is in communication connection with the pipeline gas flow monitoring and cutting-off module and the user terminal.

[0012] Further, the above gas use states include leakage state, ignition state, normal gas use state, fire use end state, and over-flow gas use state;

[0013] The pipeline gas flow monitoring and cutting-off module identifies the leakage state through the pre-valve pressure and the post-valve pressure;

[0014] The pipeline gas flow monitoring and cutting-off module identifies the ignition state according to the post-valve pressure;

[0015] The pipeline gas flow monitoring and cutting-off module identifies the fire use end state, the over-flow gas use state, and the normal gas use state through the pre-valve pressure, the post-valve pressure, and the ambient pressure.

[0016] Further, the process of identifying the leakage state by the pipeline gas flow monitoring and cutting-off module is as follows:

[0017] A1: Collect and record the pre-valve pressure value and the post-valve pressure value in the minimum fire use state; ;

[0018] A2: Obtain the pre-valve post-valve pressure difference value in the minimum fire use state: ;

[0019] A3: Collect the pre-valve pressure value and the post-valve pressure value in the real-time state at regular intervals; ;

[0020] A4: Obtain the pre-valve post-valve pressure difference value in the real-time state: ;

[0021] A5: Make a leakage judgment according to the pre-valve post-valve pressure difference value in the minimum fire use state and the pre-valve post-valve pressure difference value in the real-time state :

[0022] If and , it is determined that there is a leakage, an alarm is triggered, and the cutting-off valve is closed, otherwise, it is determined that there is no leakage.

[0023] ​​Further, the process of the above-mentioned pipeline gas flow monitoring and cutting-off module identifying the ignition state is as follows:

[0024] B1: In the pipeline gas flow monitoring and cutting-off module cutting-off state, when the pipeline gas flow monitoring and cutting-off module monitors that the pressure difference between the valve front pressure and the valve rear pressure is less than or equal to 200 Pa within 1 second, the cutting-off valve is immediately opened to supply gas to the valve rear end.

[0025] B2: Collect the valve front pressure value in the real-time state and the valve rear pressure value .

[0026] B3: Obtain the valve front pressure difference from the valve rear pressure in the real-time state: .

[0027] B4: According to the valve front pressure difference from the valve rear pressure in the real-time state , match the ignition state with the rated pressure loss:

[0028] If is greater than the rated pressure loss, the cutting-off valve is closed to stop gas supply, and if is less than or equal to the rated pressure loss, it is identified as an ignition state, and the gas supply to the valve rear end is continued.

[0029] Further, the matching time is not more than 30 seconds.

[0030] Further, the process of the above-mentioned pipeline gas flow monitoring and cutting-off module identifying the normal gas use state is as follows:

[0031] The pipeline gas flow monitoring and cutting-off module obtains the minimum gas consumption and the maximum gas consumption in the minimum fire use state and the maximum fire use state respectively, and when the real-time gas consumption monitored by the pipeline gas flow monitoring and cutting-off module is between the minimum gas consumption and the maximum gas consumption, it is identified as a normal gas use state.

[0032] Further, the process of the above-mentioned pipeline gas flow monitoring and cutting-off module identifying the end of fire use state is as follows:

[0033] C1: When the pressure difference between the valve rear pressure and the valve front pressure is less than or equal to 200 Pa, it is preliminarily judged as an end of fire use state.

[0034] C2: Reduce the opening size of the cutting-off valve, and when the valve rear pressure is equal to the valve front pressure, it is finally judged as an end of fire use state, and when the valve rear pressure is not consistent with the valve front pressure, it is finally judged as a normal gas use state, and the opening of the cutting-off valve is restored to the position before being reduced.

[0035] Further, the process of the above-mentioned pipeline gas flow monitoring and cutting-off module identifying the super-flow gas use state is as follows:

[0036] D1: The pipeline gas flow monitoring cut-off module obtains the maximum gas consumption when the maximum fire state occurs;

[0037] D2: Gas is supplied to the rear end of the valve, and the pressure values before and after the valve in the real-time state are collected and the pressure values after the valve are collected;

[0038] D3: The pressure difference before and after the valve in the real-time state is obtained: ;

[0039] D4: If is greater than the maximum gas consumption, it is identified as an over-flow gas consumption state, and the cut-off valve is closed.

[0040] Further, the personnel detection module detects whether a human body exists, the position and the activity state of the human body through the millimeter wave radar signal.

[0041] The present application has the following beneficial effects:

[0042] (1) Flow detection function: The present application can effectively detect the gas consumption state by real-time monitoring of the gas flow, and timely discover gas leakage, abnormal gas consumption and the like, thereby improving the safety of gas use.

[0043] (2) Avoiding flame interference: The personnel detection module of the present application detects the human body state in front of the stove through the millimeter wave radar signal, effectively avoids the problem that the infrared detection device is interfered by the flame, can accurately detect the human body under various stove use conditions, and improves the accuracy and reliability of detection.

[0044] (3) Comprehensive safety guarantee: The combustible gas detection module, the personnel detection module and the pipeline gas flow monitoring cut-off module of the present application cooperate with each other to form a comprehensive gas safety monitoring system. When any component detects an abnormal condition, it can timely issue an alarm and take corresponding measures to comprehensively guarantee the safety of gas use. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a schematic diagram of the gas safety system with a flow monitoring function according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] The principles and characteristics of the present application are described below in conjunction with the drawings, and the examples are only used to explain the present application and are not used to limit the scope of the present application.

[0047] An embodiment of the present application provides a gas safety system with a flow monitoring function, comprising:

[0048] The pipeline gas flow monitoring and cutting module comprises a cutting valve for cutting off the gas passage, a flow sensor for acquiring the pipeline gas flow, a pressure sensor for acquiring the pressure before and after the valve, and a chip for analyzing and processing data, wherein the chip adopts an MCU chip, the pipeline gas flow monitoring and cutting module is installed on the gas pipeline and located between the gas meter and the cooking bench, and is used for identifying the gas use state.

[0049] The combustible gas detection module is installed above the cooking bench and is in communication connection with the pipeline gas flow monitoring and cutting module, and is used for monitoring the gas leakage state in real time; when the concentration of the combustible gas is detected to be higher than the safety threshold, the combustible gas detection module will immediately issue an audible and visual alarm signal, and the signal will be transmitted to the pipeline gas flow monitoring and cutting module through Bluetooth; after receiving the signal, the pipeline gas flow monitoring and cutting module will quickly close the valve to cut off the gas supply, so as to avoid safety accidents caused by gas leakage.

[0050] The personnel detection module is installed near the cooking bench and is in communication connection with the pipeline gas flow monitoring and cutting module, and is used for detecting the human body through the millimeter wave radar signal, so as to effectively avoid the problem that the infrared detection device is disturbed by the flame; the personnel detection module can emit and receive the millimeter wave radar signal, and judges whether the human body exists, the position of the human body and the activity state of the human body by analyzing the reflected signal; when the personnel detection module detects that no one is in front of the cooking appliance for a long time (the specific time is determined according to the setting), a signal will be sent to the pipeline gas flow monitoring and cutting module, and the pipeline gas flow monitoring and cutting module can issue an alarm to remind the user according to the preset program; during the alarm process, the user manually presses the key or closes the alarm through the applet / APP or the like, or the user returns to the vicinity of the cooking appliance and is detected to have an activity signal by the personnel detection module, so that the alarm is automatically released; when the alarm exceeds 10 minutes, the valve is automatically closed to prevent gas safety accidents caused by no one watching.

[0051] The Internet of Things communication module is in communication connection with the pipeline gas flow monitoring and cutting module and the user terminal respectively.

[0052] The combustible gas detection module, the personnel detection module and the pipeline gas flow monitoring and cutting module of the present application cooperate with each other to form a comprehensive gas safety monitoring system; when any one component detects an abnormal condition, an alarm can be issued in time and corresponding measures can be taken to comprehensively ensure the safety of gas use.

[0053] In the present embodiment, the gas use state includes the leakage state, the ignition state, the end of fire use state, the over-flow gas use state and the normal gas use state.

[0054] (1) The pipeline gas flow monitoring and cutting module identifies the leakage state through the pressure before and after the valve, and the specific process is as follows:

[0055] A1: Collect and record the pre-valve pressure value in the minimum fire state and the post-valve pressure value ;

[0056] A2: Obtain the pre-valve post-valve pressure difference value in the minimum fire state: ;

[0057] A3: Collect the pre-valve pressure value in real-time state and the post-valve pressure value ;

[0058] A4: Obtain the pre-valve post-valve pressure difference value in real-time state: ;

[0059] A5: Make a leakage judgment based on the pre-valve post-valve pressure difference value in the minimum fire state and the pre-valve post-valve pressure difference value in real-time state :

[0060] If and , it is judged as leakage, triggering an alarm and closing the cut-off valve, otherwise it is judged as no leakage.

[0061] (2) The pipeline gas flow monitoring cut-off module identifies the ignition state according to the post-valve pressure and the ambient pressure, and the specific process is as follows:

[0062] B1: In the pipeline gas flow monitoring cut-off module cut-off state, the soft tube between the pipeline gas flow monitoring cut-off module and the gas stove is in a fully sealed state, at this time the pre-valve pressure and the post-valve pressure are the same, when the pipeline gas flow monitoring cut-off module monitors that the post-valve pressure drops to a difference of less than or equal to 200Pa with the ambient pressure within 1 second, it may be that there is a leakage at the post-valve end or the user turns the knob to prepare for fire, at this time the cut-off valve is immediately opened to supply gas to the post-valve end;

[0063] B2: Collect the pre-valve pressure value in real-time state and the post-valve pressure value ;

[0064] B3: Obtain the pre-valve post-valve pressure difference value in real-time state: ;

[0065] B4: Match the pre-valve post-valve pressure difference value in real-time state with the rated pressure loss to determine the ignition state, and the matching time does not exceed 30s:

[0066] If is greater than the rated pressure loss, the cut-off valve is closed to stop gas supply, if Less than or equal to the rated pressure loss, it is identified as the state of striking fire, and the gas is continuously supplied to the valve rear end.

[0067] (3) The pipeline gas flow monitoring cut-off module identifies the normal gas use state according to the gas use amount, and the specific process is as follows:

[0068] The pipeline gas flow monitoring cut-off module acquires the minimum gas use amount and the maximum gas use amount in the minimum fire use state and the maximum fire use state respectively, and when the real-time gas use amount monitored by the pipeline gas flow monitoring cut-off module is between the minimum gas use amount and the maximum gas use amount, it is identified as the normal gas use state.

[0069] (4) The pipeline gas flow monitoring cut-off module identifies the fire end state according to the valve front pressure and the valve rear pressure, and the specific process is as follows:

[0070] C1: When the difference between the valve rear pressure and the valve front pressure is less than or equal to 200 Pa, it is preliminarily judged as the fire end state;

[0071] C2: In the case of sealing the rear end, the valve opening is reduced, and the pressure loss between the valve front and the valve rear should not change, and when the rear end is in use, the valve opening is reduced, and the pressure loss between the valve front and the valve rear should change; therefore, after preliminarily judging the fire end state, the size of the cut-off valve opening is reduced, and when the valve rear pressure is equal to the valve front pressure, it is finally judged as the fire end state, and when the valve rear pressure is inconsistent with the valve front pressure, it is finally judged as the normal gas use state, and the cut-off valve opening is restored to the position before being reduced.

[0072] (5) The pipeline gas flow monitoring cut-off module identifies the super-flow gas use state through the gas use amount, and the specific process is as follows:

[0073] D1: The pipeline gas flow monitoring cut-off module acquires the maximum gas use amount in the maximum fire use state;

[0074] D2: The gas is supplied to the valve rear end, and the valve front pressure value and the valve rear pressure value in the real-time state are collected

[0075] D3: The valve front and valve rear pressure difference in the real-time state is acquired:

[0076] D4: If is greater than the maximum gas use amount, it is identified as the super-flow gas use state, and the cut-off valve is closed.

[0077] The pipeline gas flow monitoring cut-off module of the present application can effectively detect the gas use state, timely discover gas leakage, abnormal gas use and the like, and improve the safety of gas use.

[0078] ​​​The above merely describes preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas safety system with flow monitoring function, characterized in that, The application relates to a pipeline gas flow monitoring and cutting-off module. The pipeline gas flow monitoring and cutting-off module comprises a cutting-off valve, a flow sensor, a pressure sensor and a chip, is installed on a gas pipeline and located between a gas meter and a cooking range, and is used for identifying a gas use state. A combustible gas detection module is installed above the cooking range and is in communication connection with the pipeline gas flow monitoring and cutting-off module, and is used for monitoring a gas leakage state in real time. A personnel detection module is installed near the cooking range and is in communication connection with the pipeline gas flow monitoring and cutting-off module, and is used for detecting a human body. An Internet of Things communication module is in communication connection with the pipeline gas flow monitoring and cutting-off module and a user terminal. The gas use state comprises a leakage state, a fire state, a normal gas use state, an end-of-fire state and an over-flow gas use state.

2. The gas safety system with flow monitoring function according to claim 1, characterized in that, The pipeline gas flow monitoring and cutting-off module identifies the leakage state through pre-valve pressure and post-valve pressure. The pipeline gas flow monitoring and cutting-off module identifies the fire state according to post-valve pressure and ambient pressure. The pipeline gas flow monitoring and cutting-off module identifies the normal gas use state according to a gas use amount. The pipeline gas flow monitoring and cutting-off module identifies the end-of-fire state according to pre-valve pressure and post-valve pressure. The pipeline gas flow monitoring and cutting-off module identifies the over-flow gas use state through the gas use amount. The process that the pipeline gas flow monitoring and cutting-off module identifies the leakage state is as follows:

3. The gas safety system having a flow monitoring function according to claim 1, characterized by, The process that the pipeline gas flow monitoring and cutting-off module identifies the fire state is as follows: A1 : Collect and record the pre-valve pressure value under the minimum fire condition and post-valve pressure value ; A2: Obtain the valve before and after pressure difference value under the minimum fire state: ; A3: Collecting the valve before pressure value in real time state at regular intervals and the valve after pressure value ; A4: Obtain the valve before and after the pressure difference value in real-time state: ; A5: Valve before and after pressure difference under minimum fire condition and valve before and after pressure difference under real time condition Leakage judgment: If and then it is determined that there is a leak, an alarm is triggered and the shut-off valve is closed, otherwise it is determined that there is no leak.

4. The gas safety system having a flow monitoring function according to claim 2, characterized by, B1: When the pipeline gas flow monitoring and cutting-off module detects that the post-valve pressure drops to a difference from the ambient pressure of less than or equal to 200Pa within 1s in the cutting-off gas supply state, the cutting-off valve is immediately opened to supply gas to the post-valve end. The matching time is not more than 30s. B2: Collecting the pre-valve pressure value in real time and the post-valve pressure value ; B3: Obtain the valve before and after pressure difference value in real time state: ; B4: Valve before and after pressure difference value under real-time state Firing state matching with rated pressure loss: If greater than the rated pressure loss, the cut-off valve is closed to stop the gas supply, if less than or equal to the rated pressure loss, it is identified as a lighting state, and the gas supply to the rear end of the valve is continued.

5. The gas safety system with flow monitoring function according to claim 4, characterized in that, The process that the pipeline gas flow monitoring and cutting-off module identifies the normal gas use state is as follows:

6. The gas safety system having a flow monitoring function according to claim 2, characterized by, The pipeline gas flow monitoring and cutting-off module respectively acquires minimum gas use amount and maximum gas use amount in minimum fire state and maximum fire state, and identifies the normal gas use state when real-time gas use amount monitored by the pipeline gas flow monitoring and cutting-off module is between the minimum gas use amount and the maximum gas use amount. The process that the pipeline gas flow monitoring and cutting-off module identifies the end-of-fire state is as follows:

7. The gas safety system with flow monitoring function according to claim 2, characterized in that, C1: When the difference between the post-valve pressure and the pre-valve pressure is less than or equal to 200Pa, the end-of-fire state is preliminarily judged. C2: The opening size of the cutting-off valve is reduced, the end-of-fire state is finally judged when the post-valve pressure is equal to the pre-valve pressure, the normal gas use state is finally judged when the post-valve pressure is inconsistent with the pre-valve pressure, and the opening of the cutting-off valve is restored to the position before the reduction. The process that the pipeline gas flow monitoring and cutting-off module identifies the over-flow gas use state is as follows:

8. The gas safety system having a flow monitoring function according to claim 2, characterized by, D1: The pipeline gas flow monitoring and cutting-off module acquires maximum gas use amount in maximum fire state. The personnel detection module detects whether a human body exists, a position and an activity state through a millimeter wave radar signal. D2: supply air to the valve rear end, and collect the valve front pressure value in real time and the valve rear pressure value ; D3: Obtain the valve before and after the pressure difference value in real-time state: ; D4: if If the gas consumption is greater than the maximum gas consumption, the excess flow state is identified, and the cut-off valve is closed.

9. A gas safety system with flow monitoring function according to any one of claims 1 to 8, characterized in that, ​

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