CN115560927B - Gas leakage detection method and gas system - Google Patents
Gas leakage detection method and gas system Download PDFInfo
- Publication number
- CN115560927B CN115560927B CN202210968704.2A CN202210968704A CN115560927B CN 115560927 B CN115560927 B CN 115560927B CN 202210968704 A CN202210968704 A CN 202210968704A CN 115560927 B CN115560927 B CN 115560927B
- Authority
- CN
- China
- Prior art keywords
- gas
- value
- pressure
- difference
- gas meter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 17
- 238000009530 blood pressure measurement Methods 0.000 claims description 136
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 263
- 230000007423 decrease Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000010411 cooking Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Abstract
A method for detecting gas leakage and a gas system are provided. The gas meter includes: an inlet valve provided at a gas inlet of the gas meter to control inflow of gas into the gas meter; and an outlet valve provided at a gas outlet of the gas meter to control the flow of the gas out of the gas meter. The detection method comprises the steps of detecting whether the inlet valve of the gas meter has leakage or not, and comprising the following steps: controlling the inlet valve to open and controlling the outlet valve to open; opening gas consuming equipment at the downstream of the gas meter; controlling the inlet valve to be closed; closing the gas using equipment after flameout of the gas using equipment; controlling the outlet valve to be closed; and determining whether a leak exists in the gas meter's inlet valve by detecting a pressure in the gas meter downstream of the inlet valve to upstream of the outlet valve. The gas system includes a controller configured to perform a detection method.
Description
Technical Field
Embodiments of the present disclosure relate to a method of detecting gas leakage and a gas system.
Background
The popularization of the pipeline gas application brings convenience to the life of residents and improves the life quality of the residents, but each year, gas explosion accidents caused by gas leakage exist. An important cause of gas explosion is gas leakage. When the gas leakage reaches a certain concentration, explosion occurs when encountering a fire source.
At present, a method for preventing accidents caused by gas leakage is to install a gas alarm. When the fuel gas reaches a certain concentration, the fuel gas alarm can give an alarm. However, due to the traditional cooking habit in China, oil smoke is easy to adhere to the sensor of the alarm, so that the alarm is invalid.
Disclosure of Invention
At least one embodiment of the present disclosure provides a method of monitoring gas leakage using a gas meter comprising: an inlet valve provided at a gas inlet of the gas meter to control inflow of gas into the gas meter; and an outlet valve provided at a gas outlet of the gas meter to control the flow of the gas out of the gas meter. The detection method comprises the steps of detecting whether the inlet valve of the gas meter has leakage or not, and comprising the following steps: controlling the inlet valve to open and controlling the outlet valve to open; opening gas consuming equipment at the downstream of the gas meter; controlling the inlet valve to be closed; closing the gas using equipment after flameout of the gas using equipment; controlling the outlet valve to be closed; and determining whether a leak exists in the gas meter's inlet valve by detecting a pressure in the gas meter downstream of the inlet valve to upstream of the outlet valve.
For example, in some embodiments, the gas meter further comprises: a first pressure sensor disposed adjacent to the inlet valve downstream of the inlet valve; and a second pressure sensor disposed adjacent to the outlet valve upstream of the outlet valve. Determining whether a leak exists in an inlet valve of a gas meter by detecting a pressure in the gas meter downstream of the inlet valve to upstream of the outlet valve includes: detecting one or both of a first change value and a first difference change value, the first change value being a change value of a first pressure measurement value of the first pressure sensor over a first period of time, the first difference change value being a change value of a difference between the first pressure measurement value of the first pressure sensor and a second pressure measurement value of the second pressure sensor over the first period of time; and comparing the first variation value with the first threshold variation value or comparing the first difference variation value with the first difference threshold variation value, wherein when the first variation value exceeds the first threshold variation value or the first difference variation value exceeds the first difference threshold variation value, it is determined that there is a leak in the inlet valve.
For example, in some embodiments, the detection method further comprises: detecting whether a leak exists in an outlet valve of a gas meter, comprising: controlling the inlet valve to open, controlling the outlet valve to open and closing the gas consuming device downstream of the gas meter; controlling the inlet valve and the outlet valve to be closed simultaneously; detecting one or both of a second variation value and a second difference variation value, wherein the second variation value is a variation value of a second pressure measured value of the second pressure sensor in a second time period, and the second difference variation value is a variation value of a difference value between a first pressure measured value of the first pressure sensor and a second pressure measured value of the second pressure sensor in the second time period; and comparing the second variation value with the second threshold variation value or comparing the second difference variation value with the second difference threshold variation value, wherein the outlet valve is determined to have a leak when the second variation value exceeds the second threshold variation value or the second difference variation value exceeds the second difference threshold variation value.
For example, in some embodiments, detecting whether a leak exists in an outlet valve of a gas meter further comprises: after the inlet valve and the outlet valve are controlled to be closed simultaneously, before one or both of the second variation value and the second difference variation value are detected, the gas usage device at the downstream of the gas meter is opened, and the gas usage device is closed after the gas usage device is extinguished.
For example, in some embodiments, detecting whether at least one of the first pressure sensor and the second pressure sensor is malfunctioning comprises: controlling the inlet valve to open and the outlet valve to close; detecting a first pressure measurement of the first pressure sensor and detecting a second pressure measurement of the second pressure sensor; and comparing the pressure difference between the first pressure measurement and the second pressure measurement to a first threshold pressure difference, wherein the pressure difference between the first pressure measurement and the second pressure measurement is greater than the first threshold pressure difference, and determining that at least one of the first pressure sensor and the second pressure sensor is malfunctioning.
For example, in some embodiments, the gas meter further comprises: and a fourth pressure sensor disposed adjacent to the inlet valve upstream of the inlet valve. The detection method further includes detecting whether at least one of the first pressure sensor, the second pressure sensor, and the fourth pressure sensor has a fault, comprising: controlling the inlet valve to open and the outlet valve to close; detecting a first pressure measurement of the first pressure sensor, detecting a second pressure measurement of the second pressure sensor, and detecting a fourth pressure measurement of the fourth pressure sensor; and comparing the pressure difference between the two of the first pressure measurement, the second pressure measurement and the fourth pressure measurement with a corresponding threshold pressure difference, wherein when the pressure difference between the two of the first pressure measurement, the second pressure measurement and the fourth pressure measurement is greater than the corresponding threshold pressure difference, it is determined that at least one of the two has a fault.
For example, in some embodiments, the detection method further includes detecting whether a leak exists downstream of the gas meter, comprising: controlling the inlet valve to open, controlling the outlet valve to open, and closing all gas consuming devices downstream of the gas meter; controlling the inlet valve to be closed; detecting at least one of a third change value, a fourth change value and a third difference change value, wherein the third change value is a change value of a first pressure measured value of the first pressure sensor in a third time period, the fourth change value is a change value of a second pressure measured value of the second pressure sensor in the third time period, and the third difference change value is a change value of a difference value between the first pressure measured value and the second pressure measured value in the third time period; and comparing the third variation value with the third threshold variation value, or comparing the fourth variation value with the fourth threshold variation value, or comparing the third difference variation value with the third difference threshold variation value, wherein when the third variation value is greater than the third threshold variation value, or the fourth variation value is greater than the fourth threshold variation value, or the third difference variation value is greater than the third difference threshold variation value, it is determined that there is a leak downstream of the detected gas meter.
At least one embodiment of the present disclosure provides a method of monitoring gas leakage using a gas meter comprising: an inlet valve provided at a gas inlet of the gas meter to control inflow of gas into the gas meter; an outlet valve provided at a gas outlet of the gas meter to control the flow of the gas out of the gas meter; and a third pressure sensor disposed adjacent to the outlet valve downstream of the outlet valve. The detection method comprises the steps of detecting whether leakage exists at the inlet valve and the outlet valve of the gas meter at the same time, and comprising the following steps: controlling the inlet valve to open, controlling the outlet valve to open, and opening the gas consuming device downstream of the gas meter; controlling the inlet valve and the outlet valve to be closed simultaneously; closing the gas using equipment after flameout of the gas using equipment; detecting a fifth variation value of the third pressure measurement value of the third pressure sensor in a fourth time period; and comparing the fifth variation value with a fifth threshold variation value, wherein it is determined that there is a leak at both the inlet valve and the outlet valve when the fifth variation value exceeds the fifth threshold variation value.
For example, in some embodiments, the gas meter further comprises: and a fourth pressure sensor disposed adjacent to the inlet valve upstream of the inlet valve. The detection method further includes detecting whether at least one of the third pressure sensor and the fourth pressure sensor has a fault, comprising: controlling the inlet valve to open, controlling the outlet valve to open, and closing the gas consuming device downstream of the gas meter; detecting a third pressure measurement of the third pressure sensor and detecting a fourth pressure measurement of the fourth pressure sensor; and comparing the pressure difference between the third pressure measurement and the fourth pressure measurement to a second threshold pressure difference, wherein a fault is determined to exist in at least one of the third pressure sensor and the fourth pressure sensor when the pressure difference between the third pressure measurement and the fourth pressure measurement is greater than the second threshold pressure difference.
For example, in some embodiments, the gas meter further comprises: and a fourth pressure sensor disposed adjacent to the inlet valve upstream of the inlet valve. The detection method further includes detecting whether there is a leak downstream of the gas meter, comprising: controlling the inlet valve and the outlet valve to be opened, and controlling all gas utilization devices downstream of the gas meter to be closed; detecting the measurement flow of a gas meter, a third pressure measurement value of a third pressure sensor and a fourth pressure measurement value of a fourth pressure sensor; and comparing the measured flow with a threshold measured flow and comparing a measured pressure difference of the third pressure measurement and the fourth pressure measurement with a third threshold pressure difference, wherein a leak downstream of the detection gas meter is determined to be present when the measured flow exceeds the threshold measured flow or the measured pressure difference is greater than the third threshold pressure difference.
For example, in some embodiments, the detection method further includes detecting whether a leak exists downstream of the gas meter, comprising: controlling the inlet valve and the outlet valve to be opened, and controlling all gas utilization devices downstream of the gas meter to be closed; controlling the inlet valve and the outlet valve to be closed; detecting a sixth variation of the third pressure measurement of the third pressure sensor over a fifth time period; and comparing the sixth variation value with a sixth threshold variation, wherein when the sixth variation value exceeds the sixth threshold variation value, it is determined that there is a leak downstream of the detected gas meter.
At least one embodiment of the present disclosure also provides a gas system, comprising: a gas meter; a gas utilization device; and a controller configured to perform the detection method as described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure, and therefore should not be considered as limiting the scope of protection, and other related drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 shows a schematic diagram of a gas meter according to an embodiment of the present disclosure; and
FIG. 2 illustrates a flow chart of detecting whether a leak exists at an inlet valve of a gas meter in a method of detecting gas leakage according to an embodiment of the present disclosure;
FIG. 3 illustrates a flow chart of detecting whether a leak exists in an outlet valve of a gas meter in a method of detecting gas leakage according to an embodiment of the present disclosure;
FIG. 4 illustrates a flow chart of detecting whether a pressure sensor in a gas meter is malfunctioning in a method of detecting gas leakage according to an embodiment of the present disclosure;
FIG. 5 illustrates a flow chart of detecting whether there is a leak downstream of a gas meter in a method of detecting gas leaks according to an embodiment of the present disclosure;
FIG. 6 shows a flow chart of detecting whether there is a leak at the same time for an inlet valve and an outlet valve of a gas meter in a gas leak detection method according to an embodiment of the present disclosure;
FIG. 7 shows a flow chart of detecting whether a pressure sensor in a gas meter is malfunctioning in a method of detecting gas leakage according to an embodiment of the present disclosure; and
FIG. 8 illustrates a flow chart of detecting whether there is a leak downstream of a gas meter in a method of detecting gas leaks according to an embodiment of the present disclosure;
fig. 9 shows a flowchart of detecting whether there is a leak downstream of a gas meter in a gas leak detection method according to another embodiment of the present disclosure.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. It will be apparent that the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are meant to encompass the elements or items listed thereafter and equivalents thereof without materially departing from the other elements or items.
Fig. 1 shows a schematic diagram of a gas meter according to an embodiment of the present disclosure. As shown in fig. 1, the gas meter includes a housing 110 having a gas inlet 111 and a gas outlet 112, a movement 120 accommodated in the housing 110, an inlet valve 150 provided at the gas inlet 111 to control the entry of gas into the gas meter, and an outlet valve 160 provided at the gas outlet 112 to control the exit of gas from the gas meter. The gas inlet 111 is connected to an inlet pipe and the gas outlet 112 is connected to an outlet pipe to connect the gas meter into a gas pipe system. Further, the gas outlet pipe may be connected to a gas utilization apparatus to supply gas to the gas utilization apparatus via a gas meter. The gas flows to the gas utilization apparatus via the gas inlet pipe, the gas inlet 111, the movement 120, the gas outlet 112, and the gas outlet pipe. In the present disclosure, with such a gas flow path, "upstream" and "downstream" are defined. If one component is located before the other component on the gas flow path, the one component is located upstream of the other component. Conversely, if one component is located after another component on the gas flow path, the one component is located downstream of the other component. The inlet valve 150 and the outlet valve 160 may be controlled individually or in linkage. For example, the inlet valve 150 and the outlet valve 160 may be controlled separately, or the inlet valve 150 and the outlet valve 160 may be configured to open together or close together.
As shown in fig. 1, in the present embodiment, the gas meter further includes a first pressure sensor 130 disposed near the inlet valve 150 downstream of the inlet valve 150, a second pressure sensor 140 disposed near the outlet valve 160 upstream of the outlet valve 160, a third pressure sensor 170 disposed near the outlet valve 160 downstream of the outlet valve 160, and a fourth pressure sensor 180 disposed near the inlet valve 150 upstream of the inlet valve 150. The first pressure sensor 130 is for sensing the pressure of the gas that is about to enter the movement 120 through the inlet valve 150 upstream of the movement 120, the second pressure sensor 140 is for sensing the pressure of the gas that is about to exit the movement 120 from the outlet valve 160 downstream of the movement 120, the third pressure sensor 170 is for sensing the pressure of the gas within the housing 110 of the gas meter through the outlet valve 160, and the fourth pressure sensor 180 is for sensing the pressure of the gas that enters the housing 110 of the gas meter but not through the inlet valve 150.
It should be noted that the gas meter of the present disclosure is not limited to having each of the first pressure sensor 130, the second pressure sensor 140, the third pressure sensor 170, and the fourth pressure sensor 180. For example, in one example, the gas meter has only a first pressure sensor 130 and a second pressure sensor 140. For example, in another example, the gas meter has only the first pressure sensor 130, the second pressure sensor 140, and the fourth pressure sensor 180. For example, in yet another example, the gas meter has only the third pressure sensor 170 and the fourth pressure sensor 180.
In addition, the gas meter further includes a controller (not shown) communicatively connected to the inlet valve 150 and the outlet valve 160 to control opening and closing of the inlet valve 150 and the outlet valve 160, and communicatively connected to the first, second, third, and fourth pressure sensors 130, 140, 170, 180. In addition, the controller may be communicatively coupled to cartridge 120 to receive a measured flow of the gas meter.
The inventors found that it is possible to detect leakage of gas using the gas meter, for example, leakage of the gas meter itself, leakage of a gas pipe or a gas-consuming device at a downstream of the gas meter, and the like. For example, whether or not there is a gas leak may be detected based on the pressure measurement values of the first, second, third, and fourth pressure sensors 130, 140, 170, 180 and the measured flow rates of the gas meters.
Fig. 2 shows a flowchart of detecting whether there is a leak in the inlet valve 150 of the gas meter in the gas leak detection method according to an embodiment of the present disclosure. As shown in fig. 2, the process of detecting whether there is a leak in the inlet valve 150 of the gas meter includes:
Step S21, controlling the inlet valve 150 to be opened and controlling the outlet valve 160 to be opened;
step S22, opening gas utilization equipment at the downstream of the gas meter;
step S23, controlling the inlet valve 150 to be closed;
step S24, closing the gas utilization equipment after flameout of the gas utilization equipment;
Step S25, controlling the outlet valve 160 to be closed;
step S26, detecting at least one of a first variation value and a first difference variation value, the first variation value being a variation value of a first pressure measurement value of the first pressure sensor 130 in a first period of time, the first difference variation value being a variation value of a difference value between the first pressure measurement value of the first pressure sensor 130 and a second pressure measurement value of the second pressure sensor 140 in the first period of time; and
Step S27, comparing the first variation value with the first threshold variation value, or comparing the first difference variation value with the first difference threshold variation value, wherein when the first variation value exceeds the first threshold variation value or the first difference variation value exceeds the first difference threshold variation value, it is determined that there is a leak in the inlet valve 150, otherwise, it is determined that there is no leak in the inlet valve 150.
After step S25, both the inlet valve 150 and the outlet valve 160 of the gas meter are closed, and since most of the gas is consumed with the gas apparatus at step S24, there is little gas between the downstream of the inlet valve 150 and the upstream of the outlet valve 160 of the gas meter. Accordingly, if the first variation value obtained in step S26 exceeds the first threshold variation value or the first difference variation value exceeds the first difference threshold variation value, it is determined that there is a leak in the inlet valve 150. Specifically, the change in the first pressure measurement value in step S26 may refer to an increase in the first pressure measurement value, and the change in the difference value between the first pressure measurement value of the first pressure sensor 130 and the second pressure measurement value of the second pressure sensor 140 may refer to an increase in the difference value.
Accordingly, by operating the inlet valve 150, the outlet valve 160, and the gas consuming device downstream of the gas meter, and based on the change in the first pressure measurement value of the first pressure sensor 130 or the difference between the first pressure measurement value of the first pressure sensor 130 and the second pressure measurement value of the second pressure sensor 140 over the first period of time, the leakage of the inlet valve 150 of the gas meter is simply and conveniently detected.
For example, in step S26, the first pressure measurement value and/or the second pressure measurement value may be detected within the first period after the first pressure measurement value and/or the second pressure measurement value are stable for a period of time, so as to avoid interference to disturbance factors such as operation of the outlet valve 160, and ensure accuracy of detection.
It should be noted that the change value of a parameter in a period of time may refer to a difference between a value of a parameter at the beginning of a period of time and a value after the end of a period of time, or may refer to a difference between a maximum value and a minimum value of a parameter in a period of time.
Fig. 3 shows a flowchart of detecting whether there is a leak in the outlet valve 160 of the gas meter in the gas leak detection method according to an embodiment of the present disclosure. As shown in fig. 3, the process of detecting whether there is a leak in the outlet valve 160 of the gas meter includes:
Step S31, controlling the inlet valve 150 to open, controlling the outlet valve 160 to open, and closing the gas consuming apparatus downstream of the gas meter;
step S32, controlling the inlet valve 150 and the outlet valve 160 to be closed simultaneously;
step S33, opening gas utilization equipment at the downstream of the gas meter;
step S34, closing the gas utilization equipment after flameout of the gas utilization equipment;
Step S35 of detecting at least one of a second variation value, which is a variation value of the second pressure measurement value of the second pressure sensor 140 over a second period of time, and a second difference variation value, which is a variation value of a difference between the first pressure measurement value of the first pressure sensor 130 and the second pressure measurement value of the second pressure sensor 140 over the second period of time; and
Step S36, comparing the second variation value with the second threshold variation value or comparing the second difference variation value with the second difference threshold variation value, wherein when the second variation value exceeds the second threshold variation value or the second difference variation value exceeds the second difference threshold variation value, it is determined that the outlet valve 160 has leakage, otherwise, it is determined that the outlet valve 160 has no leakage.
After step S32, both the inlet valve 150 and the outlet valve 160 of the gas meter are closed, and there is gas at a certain pressure value between the inlet valve 150 and the outlet valve 160 of the gas meter. Accordingly, if the second variation value obtained in step S35 exceeds the second threshold variation value or the second difference variation value exceeds the second difference threshold variation value, it is determined that there is a leak in the outlet valve 160. Specifically, the change in the second pressure measurement value in step S35 means that the second pressure measurement value decreases, and the change in the difference between the first pressure measurement value of the first pressure sensor 130 and the second pressure measurement value of the second pressure sensor 140 may mean that the difference decreases.
Further, by turning on the gas consumption device downstream of the gas meter at step S33 and then turning off the gas consumption device after the gas consumption device is turned off at step S34, the gas downstream of the gas meter is consumed. Therefore, whether or not there is a leak in the outlet valve 160 can be more accurately determined, and the safety of the method can be improved.
Accordingly, by operating the inlet valve 150, the outlet valve 160, and the gas consuming device downstream of the gas meter, and based on the change in the second pressure measurement value of the second pressure sensor 140 over the second period of time, or based on the change in the difference between the second pressure measurement value of the first pressure sensor 130 and the second pressure measurement value of the second pressure sensor 140 over the second period of time, leakage of the outlet valve 160 of the gas meter is simply and conveniently detected.
For example, the above-described process of detecting whether there is a leak in the outlet valve 160 of the gas meter may be performed in the case where it is determined that there is no leak at the inlet valve 150 of the gas meter.
For example, in step S35, the first pressure measurement value and the second pressure measurement value may be detected within the second period after the first pressure measurement value and the second pressure measurement value are stable for a period of time, so as to avoid interference to disturbance factors such as operations of the outlet valve 160 and the inlet valve 150, and ensure accuracy of detection.
Fig. 4 shows a flowchart of detecting whether a pressure sensor has a fault in a method of detecting gas leakage according to an embodiment of the present disclosure. As shown in fig. 4, the process of detecting whether the pressure sensor of the gas meter has a fault includes:
step S41, controlling the inlet valve 150 to be opened and controlling the outlet valve 160 to be closed;
Step S42, detecting a first pressure measurement value of the first pressure sensor 130, and detecting a second pressure measurement value of the second pressure sensor 140; and
Step S43, comparing the pressure difference between the first pressure measurement value and the second pressure measurement value with a first threshold pressure difference, wherein the pressure difference between the first pressure measurement value and the second pressure measurement value is greater than the first threshold pressure difference, determining that at least one of the first pressure sensor 130 and the second pressure sensor 140 has a fault, and otherwise, determining that the first pressure sensor 130 and the second pressure sensor 140 have no fault.
In a variant example, step S42 may further include detecting a fourth pressure measurement of the fourth pressure sensor 180, and step S43 may further include comparing a pressure difference between two of the first pressure measurement, the second pressure measurement, and the fourth pressure measurement with a respective threshold pressure difference, wherein it is determined that at least one of the two pressure sensors is malfunctioning when the respective pressure difference is greater than the respective threshold pressure difference.
After step S41, the gas meter' S inlet valve 150 is opened and the outlet valve 160 is closed, and the first pressure sensor 130, the second pressure sensor 140, and the fourth pressure sensor 180 are all at the supply pressure. Thus, if the difference between the two exceeds the threshold pressure difference, it may be determined that at least one pressure sensor is malfunctioning. The threshold pressure difference corresponding to the pressure difference between the two of the first pressure measurement value, the second pressure measurement value, and the fourth pressure measurement value may be the same or different.
Thus, by operating the inlet valve 150 and the outlet valve 160, and based on the measured values of the respective pressure sensors, it is simply and conveniently detected whether the pressure sensors are malfunctioning.
For example, the above-described process of detecting whether a pressure sensor of a gas meter has failed may be performed in the case where it is determined that there is no leak at the outlet valve 160 of the gas meter.
Fig. 5 shows a flowchart of detecting whether there is a leak downstream of a gas meter in a gas leak detection method according to an embodiment of the present disclosure. As shown in fig. 5, the process of detecting whether there is a leak downstream of the gas meter includes:
Step S51, controlling the inlet valve 150 to open, controlling the outlet valve 160 to open, and closing all gas consuming devices downstream of the gas meter;
step S52, controlling the inlet valve 150 to be closed;
Step S53 of detecting at least one of a third variation value, which is a variation value of the first pressure measurement value of the first pressure sensor 130 over a third period of time, a fourth variation value, which is a variation value of the second pressure measurement value of the second pressure sensor 140 over a third period of time, and a third difference variation value, which is a variation value of a difference value between the first pressure measurement value of the first pressure sensor 130 and the second pressure measurement value of the second pressure sensor 140 over the third period of time;
And S54, comparing the third variation value with a third threshold variation value, comparing the fourth variation value with a fourth threshold variation value, or comparing the third difference variation value with a third difference threshold variation value, and determining that the downstream of the gas meter is detected to have leakage when the third variation value is larger than the third threshold variation value and the fourth variation value is larger than the fourth threshold variation value and the third difference variation value is larger than the third difference threshold variation value, otherwise determining that the downstream of the gas meter is not leaked.
After step S52, the inlet valve 150 and the outlet valve 160 of the gas meter are closed and the gas at a certain pressure value exists between the gas meter and the gas using equipment downstream thereof (including the piping connecting the gas meter and the gas using equipment). Accordingly, if at least one of the third variation value, the fourth variation value, and the third difference variation value obtained in step S53 exceeds the corresponding threshold variation value, it is determined that there is a leak downstream of the gas meter. Specifically, the change in the third pressure measurement value and the fourth pressure measurement value in step S53 means a corresponding decrease in the pressure measurement value.
Thus, by operating the inlet valve 150, the outlet valve 160, and the gas consuming device downstream of the gas meter, and based on a change in at least one of the first pressure measurement value and the second pressure measurement value or a difference thereof over the third period of time, leakage downstream of the gas meter is simply and conveniently detected.
For example, the above-described process of detecting whether there is a leak downstream of the gas meter may be performed in a case where it is determined that there is no leak at the inlet valve 150 and the outlet valve 160 of the gas meter, or in a case where it is determined that there is no leak at the inlet valve 150 and the outlet valve 160 of the gas meter and that the respective pressure sensors are not malfunctioning.
For example, in step S52 and step S53, after the first pressure measurement value and the second pressure measurement value are stabilized, the inlet valve 150 may be controlled to be closed again, so as to avoid interference to disturbance factors such as operation of the gas device, operation of the inlet valve 150, and the like, and ensure accuracy of detection.
Fig. 6 shows a flowchart of detecting whether there is a leak at the same time of the inlet valve 150 and the outlet valve 160 of the gas meter in the gas leak detection method according to an embodiment of the present disclosure. As shown in fig. 6, the process of detecting whether there is a leak at the same time in the inlet valve 150 and the outlet valve 160 of the gas meter includes:
step S61, controlling the inlet valve 150 to open, controlling the outlet valve 160 to open, and opening the gas consuming apparatus downstream of the gas meter;
step S62, controlling the inlet valve 150 and the outlet valve 160 to be closed simultaneously;
step S63, closing the gas utilization equipment after flameout of the gas utilization equipment;
step S64, detecting a fifth variation value of the third pressure measurement value of the third pressure sensor 170 in the fourth period; and
Step S65, comparing the fifth variation value with the fifth threshold variation value, wherein when the fifth variation value exceeds the fifth threshold variation value, it is determined that the inlet valve 150 and the outlet valve 160 simultaneously have leakage, and otherwise, it is determined that the inlet valve 150 and the outlet valve 160 do not simultaneously have leakage.
The process is particularly suited to gas meters where the inlet valve 150 and the outlet valve 160 are configured to open and close together.
After step S63, both the inlet valve 150 and the outlet valve 160 of the gas meter are closed, and since most of the gas is consumed with the gas appliance at step S63, there is almost no gas at the third pressure sensor 170 downstream of the outlet valve 160 of the gas meter. Therefore, if the fifth variation value obtained in step S63 exceeds the fifth threshold variation value, it is determined that there is a leak at the same time of the inlet valve 150 and the outlet valve 160. Specifically, for example, the change in the third pressure measurement value in step S65 means that the third pressure measurement value rises.
Thus, by operating the inlet valve 150, the outlet valve 160, and the gas consuming device downstream of the gas meter, and based on the change in the third pressure measurement value of the third pressure sensor 170 over the first period of time, leakage of the inlet valve 150 and the outlet valve 160 of the gas meter is detected simply and conveniently.
For example, in step S64, the third pressure measurement may be detected in a fourth period after the third pressure measurement is stabilized for a period of time, so as to avoid interference with disturbance factors such as operation of the outlet valve 160, and ensure accuracy of detection.
Fig. 7 shows a flowchart of detecting whether a pressure sensor has a fault in a method of detecting gas leakage according to an embodiment of the present disclosure. As shown in fig. 7, the process of detecting whether the pressure sensor of the gas meter has a fault includes:
step S71, controlling the inlet valve 150 to open, controlling the outlet valve 160 to open, and closing the gas consuming apparatus downstream of the gas meter;
step S72, detecting a third pressure measurement value of the third pressure sensor 170, and detecting a fourth pressure measurement value of the fourth pressure sensor 180; and
Step S73, comparing the pressure difference between the third pressure measurement value and the fourth pressure measurement value with the second threshold pressure difference, wherein when the pressure difference between the third pressure measurement value and the fourth pressure measurement value is greater than the second threshold pressure difference, it is determined that at least one of the third pressure sensor 170 and the fourth pressure sensor 180 has a failure.
After step S71, the gas meter' S inlet valve 150 and outlet valve 160 are both open, and the third and fourth pressure sensors 180 are both at the supply pressure. Thus, if the difference between the two exceeds the threshold pressure difference, it may be determined that at least one pressure sensor is malfunctioning.
Thus, by operating the inlet valve 150 and the outlet valve 160, and based on the measured values of the respective pressure sensors, it is simply and conveniently detected whether the pressure sensors are malfunctioning.
For example, the above-described process of detecting whether or not there is a failure in the pressure sensor of the gas meter may be performed in a case where it is determined that there is no leak at the inlet valve outlet valve 160 of the gas meter.
Fig. 8 shows a flowchart of detecting whether there is a leak downstream of a gas meter in a gas leak detection method according to an embodiment of the present disclosure. As shown in fig. 8, the process of detecting whether there is a leak downstream of the gas meter includes:
Step S81 of controlling the inlet valve 150 and the outlet valve 160 to be opened and controlling all gas consuming devices downstream of the gas meter to be closed;
step S82, detecting a measured flow of the gas meter, a third pressure measurement value of the third pressure sensor 170, and a fourth pressure measurement value of the fourth pressure sensor 180;
Step S83, comparing the measured flow with a threshold measured flow, and comparing the measured pressure difference between the third pressure measurement and the fourth pressure measurement with a threshold pressure difference, wherein when the measured flow exceeds the threshold measured flow or the measured pressure difference is greater than the threshold pressure difference, it is determined that there is a leak downstream of the detected gas meter.
After step S81, both the inlet valve 150 and the outlet valve 160 of the gas meter are opened, but the gas-consuming device downstream of the gas meter is closed. Thus, if the measured flow exceeds the threshold measured flow or the measured pressure differential is greater than the threshold pressure differential, a gas flow is indicated to be present, thereby determining that a leak is present downstream of the gas meter.
Accordingly, by operating the inlet valve 150, the outlet valve 160, and the gas consuming apparatus downstream of the gas meter, and based on the measured flow rate of the gas meter or the pressure difference of the third pressure sensor 170 and the fourth pressure sensor 180, leakage downstream of the gas meter is simply and conveniently detected.
For example, the threshold flow rate may be a start flow rate of the gas meter.
Fig. 9 shows a flowchart of detecting whether there is a leak downstream of a gas meter in a gas leak detection method according to another embodiment of the present disclosure. As shown in fig. 9, the process of detecting whether there is a leak downstream of the gas meter includes:
Step S91, controlling the inlet valve 150 and the outlet valve 160 to be opened, and controlling all gas consuming devices downstream of the gas meter to be closed;
Step S92, controlling the inlet valve 150 and the outlet valve 160 to be closed;
Step S93, detecting a sixth variation value of the third pressure measurement value of the third pressure sensor 170 in the fifth period;
And step S94, comparing the sixth change value with a sixth threshold change value, wherein when the sixth change value exceeds the sixth threshold change value, it is determined that leakage exists at the downstream of the detection gas meter.
After step S93, both the inlet valve 150 and the outlet valve 160 of the gas meter are closed, and the gas consuming device downstream of the gas meter is also closed. Accordingly, if the change in the third pressure measurement of the third pressure sensor 170 exceeds the threshold, it may be determined that a leak exists downstream of the gas meter.
At least one embodiment of the present disclosure also includes a gas system including a gas meter, a gas usage device downstream of the gas meter, and a controller of the system. The above method may be performed by a controller of the system. The controller may be connected to a controller of a gas meter and a gas consuming device for performing the above method. The controller may include, for example, a microprocessor, a digital signal processor ("DSP"), an application specific integrated circuit ("ASIC"), a field programmable gate array ("FPGA"), or the like. The controller may comprise a plurality of discrete sub-controllers. The controller may also be communicatively connected with a remote server, mobile terminal, or the like, for example, to issue an alarm message when the occurrence of a gas leak is detected. In some embodiments, the parameters described above, such as time period, threshold change value, threshold pressure difference, threshold flow rate, etc., may be set by the gas company or a user using the gas meter. Furthermore, the above method may also be performed manually.
The scope of the present disclosure is defined not by the above-described embodiments but by the appended claims and their equivalents.
Claims (10)
1. A method for monitoring gas leakage by using a gas meter,
The gas meter includes:
an inlet valve provided at a gas inlet of the gas meter to control inflow of gas into the gas meter;
An outlet valve provided at a gas outlet of the gas meter to control the flow of the gas out of the gas meter;
A first pressure sensor disposed adjacent to the inlet valve downstream of the inlet valve; and
A second pressure sensor disposed adjacent to the outlet valve upstream of the outlet valve,
The method includes detecting whether a leak exists in an inlet valve of a gas meter, comprising:
Controlling the inlet valve to open and controlling the outlet valve to open;
Opening gas consuming equipment at the downstream of the gas meter;
Controlling the inlet valve to be closed;
closing the gas using equipment after flameout of the gas using equipment;
Controlling the outlet valve to be closed;
detecting a first difference change value, the first difference change value being a change value of a difference between a first pressure measurement value of a first pressure sensor and a second pressure measurement value of a second pressure sensor over a first period of time; and
Comparing the first difference change value to a first difference threshold change value, wherein when the first difference change value exceeds the first difference threshold change value, it is determined that a leak exists in the inlet valve,
The method includes detecting whether a leak exists in an outlet valve of a gas meter, comprising:
Controlling the inlet valve to open, controlling the outlet valve to open and closing the gas consuming device downstream of the gas meter;
Controlling the inlet valve and the outlet valve to be closed simultaneously;
detecting a second differential change value, the second differential change value being a change value of a difference between a first pressure measurement value of the first pressure sensor and a second pressure measurement value of the second pressure sensor over a second period of time;
and comparing the second difference value change value with a second difference value threshold value change value, wherein when the second difference value change value exceeds the second difference value threshold value change value, the outlet valve is determined to have leakage.
2. The method of claim 1, wherein,
Detecting whether leakage exists in an outlet valve of the gas meter, and further comprising
After the inlet valve and the outlet valve are controlled to be closed simultaneously, before one or both of the second variation value and the second difference variation value are detected, the gas usage device at the downstream of the gas meter is opened, and the gas usage device is closed after the gas usage device is extinguished.
3. The method of claim 1, further comprising:
detecting whether at least one of the first pressure sensor and the second pressure sensor has a fault, comprising:
Controlling the inlet valve to open and the outlet valve to close;
detecting a first pressure measurement of the first pressure sensor and detecting a second pressure measurement of the second pressure sensor; and
Comparing the pressure difference between the first pressure measurement and the second pressure measurement to a first threshold pressure difference, wherein the pressure difference between the first pressure measurement and the second pressure measurement is greater than the first threshold pressure difference, and determining that at least one of the first pressure sensor and the second pressure sensor is faulty.
4. The method according to claim 1,
The gas meter further includes:
A fourth pressure sensor disposed adjacent to the inlet valve upstream of the inlet valve,
The method further includes detecting whether at least one of the first pressure sensor, the second pressure sensor, and the fourth pressure sensor is malfunctioning, comprising:
Controlling the inlet valve to open and the outlet valve to close;
Detecting a first pressure measurement of the first pressure sensor, detecting a second pressure measurement of the second pressure sensor, and detecting a fourth pressure measurement of the fourth pressure sensor; and
Comparing the pressure difference between the two of the first pressure measurement, the second pressure measurement and the fourth pressure measurement with a corresponding threshold pressure difference, wherein a fault is determined to exist in at least one of the first pressure measurement, the second pressure measurement and the fourth pressure measurement when the pressure difference between the two is greater than the corresponding threshold pressure difference.
5. The method of any of claims 1-4, further comprising detecting whether a leak is present downstream of the gas meter, comprising:
Controlling the inlet valve to open, controlling the outlet valve to open, and closing all gas consuming devices downstream of the gas meter;
Controlling the inlet valve to be closed;
Detecting at least one of a third change value, a fourth change value, and a third difference change value, the third change value being a change value of the first pressure measurement value of the first pressure sensor over a third period of time, the fourth change value being a change value of the second pressure measurement value of the second pressure sensor over the third period of time, the third difference change value being a change value of a difference between the first pressure measurement value and the second pressure measurement value over the third period of time; and
And comparing the third variation value with the third threshold variation value, or comparing the fourth variation value with the fourth threshold variation value, or comparing the third difference variation value with the third difference threshold variation value, wherein when the third variation value is larger than the third threshold variation value, or the fourth variation value is larger than the fourth threshold variation value, or the third difference variation value is larger than the third difference threshold variation value, it is determined that a leak exists at the downstream of the detected gas meter.
6. The method of claim 1, wherein,
The gas meter includes:
a third pressure sensor disposed adjacent to the outlet valve downstream of the outlet valve,
The method includes detecting whether there is a leak at both an inlet valve and an outlet valve of a gas meter, comprising:
controlling the inlet valve to open, controlling the outlet valve to open, and opening the gas consuming device downstream of the gas meter;
Controlling the inlet valve and the outlet valve to be closed simultaneously;
closing the gas using equipment after flameout of the gas using equipment;
Detecting a fifth variation value of the third pressure measurement value of the third pressure sensor in a fourth time period; and
And comparing the fifth variation value with a fifth threshold variation value, wherein when the fifth variation value exceeds the fifth threshold variation value, it is determined that there is a leak at the same time for the inlet valve and the outlet valve.
7. The method according to claim 6, wherein the method comprises,
The gas meter further includes:
A fourth pressure sensor disposed adjacent to the inlet valve upstream of the inlet valve,
The method further includes detecting whether at least one of the third pressure sensor and the fourth pressure sensor is malfunctioning, comprising:
Controlling the inlet valve to open, controlling the outlet valve to open, and closing the gas consuming device downstream of the gas meter;
detecting a third pressure measurement of the third pressure sensor and detecting a fourth pressure measurement of the fourth pressure sensor; and
And comparing the pressure difference between the third pressure measurement and the fourth pressure measurement with a second threshold pressure difference, wherein a fault is determined to exist in at least one of the third pressure sensor and the fourth pressure sensor when the pressure difference between the third pressure measurement and the fourth pressure measurement is greater than the second threshold pressure difference.
8. The method according to claim 6, wherein the method comprises,
The gas meter further includes:
A fourth pressure sensor disposed adjacent to the inlet valve upstream of the inlet valve,
The method further includes detecting whether a leak exists downstream of the gas meter, comprising:
Controlling the inlet valve and the outlet valve to be opened, and controlling all gas utilization devices downstream of the gas meter to be closed;
detecting the measurement flow of a gas meter, a third pressure measurement value of a third pressure sensor and a fourth pressure measurement value of a fourth pressure sensor;
comparing the measured flow rate to a threshold measured flow rate, and comparing a measured pressure difference of the third pressure measurement and the fourth pressure measurement to a third threshold pressure difference, wherein a leak downstream of the detection gas meter is determined to be present when the measured flow rate exceeds the threshold measured flow rate or the measured pressure difference is greater than the third threshold pressure difference.
9. The method according to claim 6, wherein the method comprises,
The method further includes detecting whether a leak exists downstream of the gas meter, comprising:
Controlling the inlet valve and the outlet valve to be opened, and controlling all gas utilization devices downstream of the gas meter to be closed;
Controlling the inlet valve and the outlet valve to be closed;
Detecting a sixth variation of the third pressure measurement of the third pressure sensor over a fifth time period;
And comparing the sixth variation value with a sixth threshold variation, wherein when the sixth variation value exceeds the sixth threshold variation value, it is determined that there is a leak downstream of the detected gas meter.
10. A gas system, comprising:
A gas meter;
A gas utilization device; and
A controller configured to perform the method according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968704.2A CN115560927B (en) | 2022-08-12 | Gas leakage detection method and gas system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968704.2A CN115560927B (en) | 2022-08-12 | Gas leakage detection method and gas system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115560927A CN115560927A (en) | 2023-01-03 |
| CN115560927B true CN115560927B (en) | 2024-05-31 |
Family
ID=
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5439355A (en) * | 1993-11-03 | 1995-08-08 | Abbott Laboratories | Method and apparatus to test for valve leakage in a pump assembly |
| JP2001330487A (en) * | 2000-05-22 | 2001-11-30 | Ricoh Elemex Corp | Membrane type gas meter |
| CN205048170U (en) * | 2015-08-24 | 2016-02-24 | 重庆瑞力比燃气设备有限责任公司 | Combustion gas leakage alarm system |
| CN105953857A (en) * | 2016-07-07 | 2016-09-21 | 浙江驰峰自动化科技有限公司 | Multifunctional intelligent gas meter |
| CN206248155U (en) * | 2016-12-08 | 2017-06-13 | 四川海力智能科技股份有限公司 | A kind of intelligent gas meter |
| CN108844692A (en) * | 2018-06-27 | 2018-11-20 | 董建礼 | A kind of pressure difference method detection diaphragm gas meter internal leakage device and operation method |
| CN110005960A (en) * | 2018-01-04 | 2019-07-12 | 黄羽婵 | The method of the automatic detection gas leakage of gas burning system |
| CN110530436A (en) * | 2018-05-23 | 2019-12-03 | 中国石油天然气股份有限公司 | Differential pressure type metering device, flow metering method, device and storage medium |
| CN210834037U (en) * | 2019-12-09 | 2020-06-23 | 重庆炅启热能科技有限公司 | Inspection bench for double-control electromagnetic valve |
| CN111720752A (en) * | 2019-03-20 | 2020-09-29 | 青岛海尔电冰箱有限公司 | Method and device for detecting abnormality of water path |
| CN112601940A (en) * | 2018-11-05 | 2021-04-02 | 松下知识产权经营株式会社 | Gas meter |
| CN214173618U (en) * | 2021-03-17 | 2021-09-10 | 杭州先锋电子技术股份有限公司 | Device for detecting pipeline pressure based on gas meter |
| CN214583903U (en) * | 2021-01-20 | 2021-11-02 | 石家庄新奥能源发展有限公司 | Indoor gas leakage alarm device |
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5439355A (en) * | 1993-11-03 | 1995-08-08 | Abbott Laboratories | Method and apparatus to test for valve leakage in a pump assembly |
| JP2001330487A (en) * | 2000-05-22 | 2001-11-30 | Ricoh Elemex Corp | Membrane type gas meter |
| CN205048170U (en) * | 2015-08-24 | 2016-02-24 | 重庆瑞力比燃气设备有限责任公司 | Combustion gas leakage alarm system |
| CN105953857A (en) * | 2016-07-07 | 2016-09-21 | 浙江驰峰自动化科技有限公司 | Multifunctional intelligent gas meter |
| CN206248155U (en) * | 2016-12-08 | 2017-06-13 | 四川海力智能科技股份有限公司 | A kind of intelligent gas meter |
| CN110005960A (en) * | 2018-01-04 | 2019-07-12 | 黄羽婵 | The method of the automatic detection gas leakage of gas burning system |
| CN110530436A (en) * | 2018-05-23 | 2019-12-03 | 中国石油天然气股份有限公司 | Differential pressure type metering device, flow metering method, device and storage medium |
| CN108844692A (en) * | 2018-06-27 | 2018-11-20 | 董建礼 | A kind of pressure difference method detection diaphragm gas meter internal leakage device and operation method |
| CN112601940A (en) * | 2018-11-05 | 2021-04-02 | 松下知识产权经营株式会社 | Gas meter |
| CN111720752A (en) * | 2019-03-20 | 2020-09-29 | 青岛海尔电冰箱有限公司 | Method and device for detecting abnormality of water path |
| CN210834037U (en) * | 2019-12-09 | 2020-06-23 | 重庆炅启热能科技有限公司 | Inspection bench for double-control electromagnetic valve |
| CN214583903U (en) * | 2021-01-20 | 2021-11-02 | 石家庄新奥能源发展有限公司 | Indoor gas leakage alarm device |
| CN214173618U (en) * | 2021-03-17 | 2021-09-10 | 杭州先锋电子技术股份有限公司 | Device for detecting pipeline pressure based on gas meter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20190063689A1 (en) | Leak detection device and method | |
| EA024948B1 (en) | Fluid leakage detection system | |
| KR940009575A (en) | Gas supply equipment abnormality detection device and detection method | |
| RU2010112926A (en) | PROTECTIVE GAS FLOW CONTROLLER FOR WELDING MACHINE | |
| JP3579976B2 (en) | Piping leak monitoring device | |
| SE538526C2 (en) | Systems and method for monitoring pipeline systems | |
| JP4558168B2 (en) | Gas metering monitoring system | |
| IT201900006012A1 (en) | Device for reading and checking the gas supply, equipped with safety functions. | |
| US8386084B2 (en) | Gas shutoff device | |
| WO2010087185A1 (en) | Gas shutoff device | |
| CN109612111B (en) | Method for controlling gas water heater with storage tank | |
| JP7149458B2 (en) | gas meter | |
| CN115560927B (en) | Gas leakage detection method and gas system | |
| JP5428518B2 (en) | Gas shut-off device | |
| EP2177884A1 (en) | Flow rate metering device, flow rate measuring system, and flow rate measuring method | |
| CN115560927A (en) | Gas leakage detection method and gas system | |
| CN2627485Y (en) | Fluid medium leakage detection device | |
| KR20240044423A (en) | Cost-effective pressure sensors for gas meters | |
| JP4439195B2 (en) | Utility consumer equipment operation recognition device | |
| JP2022015555A (en) | Gas leakage inspection system | |
| JP4935576B2 (en) | Gas shut-off device | |
| JP2010140189A (en) | Secondary pressure monitoring device and secondary pressure discrimination method | |
| JP5368121B2 (en) | Gas leak detection device | |
| JP2010139360A (en) | Gas supply security apparatus and gas meter | |
| CN115560817A (en) | Control method of gas meter, method for monitoring abnormal gas supply state and gas meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |