CN115560927A - Gas leakage detection method and gas system - Google Patents
Gas leakage detection method and gas system Download PDFInfo
- Publication number
- CN115560927A CN115560927A CN202210968704.2A CN202210968704A CN115560927A CN 115560927 A CN115560927 A CN 115560927A CN 202210968704 A CN202210968704 A CN 202210968704A CN 115560927 A CN115560927 A CN 115560927A
- Authority
- CN
- China
- Prior art keywords
- gas
- pressure
- difference
- gas meter
- pressure sensor
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 19
- 238000009530 blood pressure measurement Methods 0.000 claims description 133
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 238000004880 explosion Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010411 cooking Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Measuring Volume Flow (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
A method for detecting gas leakage and a gas system are provided. This gas table includes: the inlet valve is arranged at a gas inlet of the gas meter to control gas to flow into the gas meter; and the outlet valve is arranged at the gas outlet of the gas meter so as to control the gas to flow 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 the detection method comprises the following steps: controlling the inlet valve to open and the outlet valve to open; opening gas using equipment at the downstream of the gas meter; controlling the inlet valve to close; closing the gas utilization equipment after the gas utilization equipment is flamed out; controlling the outlet valve to close; and determining whether the inlet valve of the gas meter has leakage by detecting the pressure in the gas meter from the downstream of the inlet valve to the upstream of the outlet valve. The gas system includes a controller configured to perform the detection method.
Description
Technical Field
The embodiment of the disclosure relates to a gas leakage detection method and a gas system.
Background
The popularization of pipeline gas application brings convenience to the life of residents, improves the life quality of the residents, and gas explosion accidents caused by gas leakage exist every year. An important cause of gas explosion is gas leakage. When the gas leakage reaches a certain concentration, explosion will occur when encountering fire source.
At present, the method for preventing accidents caused by gas leakage is to install a gas alarm. When the gas reaches a certain concentration, the gas alarm can give an alarm. However, due to the traditional cooking habits of China, oil smoke is easily attached to the sensor of the alarm, so that the alarm fails.
Disclosure of Invention
At least one embodiment of the present disclosure provides a method for monitoring gas leakage by using a gas meter, where the gas meter includes: the inlet valve is arranged at a gas inlet of the gas meter to control the gas to flow into the gas meter; and the outlet valve is arranged at the gas outlet of the gas meter so as to control the gas to flow 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 the detection method comprises the following steps: controlling the inlet valve to open and the outlet valve to open; opening gas using equipment at the downstream of the gas meter; controlling the inlet valve to close; closing the gas utilization equipment after the gas utilization equipment is flamed out; controlling the outlet valve to close; and determining whether the inlet valve of the gas meter has a leak by detecting the pressure in the gas meter from the downstream of the inlet valve to the 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 in the vicinity of the outlet valve, upstream of the outlet valve. Determining whether the inlet valve of the gas meter has a leak by detecting a pressure in the gas meter downstream of the inlet valve to upstream of the outlet valve comprises: detecting one or both of a first change value and a first difference change value, the first change value being a change in a first pressure measurement of the first pressure sensor over a first time period, the first difference change value being a change in a difference between the first pressure measurement of the first pressure sensor and a second pressure measurement of the second pressure sensor over the first time period; and comparing the first change value to a first threshold change value or comparing the first difference change value to a first difference threshold change value, wherein the inlet valve is determined to have a leak when the first change value exceeds the first threshold change value or the first difference change value exceeds the first difference threshold change value.
For example, in some embodiments, the detection method further comprises: whether the outlet valve of detecting gas table exists the leakage, it includes: controlling the inlet valve to be opened, controlling the outlet valve to be opened and closing the gas-using equipment at the downstream of the gas meter; controlling the inlet valve and the outlet valve to be closed simultaneously; detecting one or both of a second change value and a second difference change value, the second change value being a change in a second pressure measurement of the second pressure sensor over a second time period, the second difference change value being a change in a difference between a first pressure measurement of the first pressure sensor and a second pressure measurement of the second pressure sensor over the second time period; and comparing the second variation value with a second threshold variation value or comparing the second difference variation value with a 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 has a leak.
For example, in some embodiments, detecting whether there is a leak in an outlet valve of the gas meter further comprises: after the inlet valve and the outlet valve are controlled to be closed simultaneously, the gas-using equipment at the downstream of the gas meter is opened before one or both of the second change value and the second difference change value are detected, and the gas-using equipment is closed after the gas-using equipment is extinguished.
For example, in some embodiments, detecting whether a fault exists in at least one of the first pressure sensor and the second pressure sensor comprises: controlling the inlet valve to open and the outlet valve to close; detecting a first pressure measurement of a first pressure sensor and detecting a second pressure measurement of a second pressure sensor; and comparing a 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, determining that a fault exists in at least one of the first pressure sensor and the second pressure sensor.
For example, in some embodiments, the gas meter further comprises: a fourth pressure sensor disposed in proximity to the inlet valve, upstream of the inlet valve. The detection method further includes detecting whether there is a failure in at least one of the first pressure sensor, the second pressure sensor, and the fourth pressure sensor, including: 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 a pressure difference between the first pressure measurement, the second pressure measurement, and the fourth pressure measurement to 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.
For example, in some embodiments, the detection method further comprises detecting whether a leak exists downstream of the gas meter, which comprises: controlling the inlet valve to be opened, controlling the outlet valve to be opened, and closing all gas-using equipment at the downstream of the gas meter; controlling the inlet valve to close; detecting at least one of a third variation value, a fourth variation value and a third difference variation value, wherein the third variation value is a variation value of the first pressure measurement value of the first pressure sensor in a third time period, the fourth variation value is a variation value of the second pressure measurement value of the second pressure sensor in the third time period, and the third difference variation value is a variation value of the difference value between the first pressure measurement value and the second pressure measurement value in the third time period; and comparing the third change value with a third threshold change value, or comparing the fourth change value with a fourth threshold change value, or comparing the third difference change value with a third difference threshold change value, wherein when the third change value is greater than the third threshold change value, or the fourth change value is greater than the fourth threshold change value, or the third difference change value is greater than the third difference threshold change value, it is determined that the leakage exists at the downstream of the gas meter.
At least one embodiment of the present disclosure provides a method for monitoring gas leakage by using a gas meter, where the gas meter includes: the inlet valve is arranged at a gas inlet of the gas meter to control gas to flow into the gas meter; the outlet valve is arranged at a gas outlet of the gas meter to control gas to flow out of the gas meter; and a third pressure sensor disposed in the vicinity of the outlet valve, downstream of the outlet valve. The detection method comprises the steps of detecting whether leakage exists in an inlet valve and an outlet valve of the gas meter at the same time or not, and comprises the following steps: controlling the inlet valve to be opened, controlling the outlet valve to be opened, and opening the gas using equipment at the downstream of the gas meter; controlling the inlet valve and the outlet valve to be closed simultaneously; closing the gas utilization equipment after the gas utilization equipment is flamed out; detecting a fifth change in the third pressure measurement of the third pressure sensor over a fourth time period; and comparing the fifth variation value with a fifth threshold variation value, wherein it is determined that the inlet valve and the outlet valve have leaks at the same time when the fifth variation value exceeds the fifth threshold variation value.
For example, in some embodiments, the gas meter further comprises: a fourth pressure sensor disposed in proximity to the inlet valve, upstream of the inlet valve. The detection method further includes detecting whether there is a failure in at least one of the third pressure sensor and the fourth pressure sensor, including: controlling the inlet valve to be opened, controlling the outlet valve to be opened, and closing the gas-using equipment at the 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 a pressure difference between the third pressure measurement and the fourth pressure measurement to a second threshold pressure difference, wherein a fault is determined 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: a fourth pressure sensor disposed adjacent the inlet valve, upstream of the inlet valve. The detection method also comprises the step of detecting whether the downstream of the gas meter has leakage or not, and the detection method comprises the following steps: controlling the inlet valve and the outlet valve to be opened, and controlling all gas-using equipment at the downstream of the gas meter to be closed; detecting the measured flow of the gas meter, a third pressure measured value of a third pressure sensor and a fourth pressure measured value of a fourth pressure sensor; and comparing the measured flow rate with a threshold measured flow rate, and comparing a measured pressure difference of the third pressure measured value and the fourth pressure measured value with a third threshold pressure difference, wherein when the measured flow rate exceeds the threshold measured flow rate or the measured pressure difference is greater than the third threshold pressure difference, it is determined that there is a leak downstream of the gas meter.
For example, in some embodiments, the detection method further comprises detecting whether a leak exists downstream of the gas meter, which comprises: controlling the inlet valve and the outlet valve to be opened, and controlling all gas-using equipment at the downstream of the gas meter to be closed; controlling the inlet and outlet valves to close; detecting a sixth change in a third pressure measurement of the third pressure sensor over a fifth time period; and comparing the sixth change value with a sixth threshold change value, wherein when the sixth change value exceeds the sixth threshold change value, the leakage at the downstream of the gas meter is determined to be detected.
At least one embodiment of the present disclosure also provides a gas system, which includes: a gas meter; a gas using 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 needed to be used 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 for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort.
FIG. 1 shows a schematic diagram of a gas meter according to an embodiment of the present disclosure; and is provided with
Fig. 2 shows a flow chart of detecting whether there is leakage in an inlet valve of a gas meter in a gas leakage detection method according to an embodiment of the present disclosure;
fig. 3 shows a flow chart of detecting whether there is leakage at an outlet valve of a gas meter in a gas leakage detection method according to an embodiment of the present disclosure;
fig. 4 shows a flow chart for detecting whether a pressure sensor in a gas meter has a fault in a gas leakage detection method according to an embodiment of the present disclosure;
fig. 5 shows a flow chart of detecting whether there is a leak downstream of the gas meter in the gas leak detection method according to an embodiment of the present disclosure;
fig. 6 is a flowchart illustrating a method for detecting a gas leakage according to an embodiment of the present disclosure, in which whether leakage occurs in both an inlet valve and an outlet valve of a gas meter is detected;
fig. 7 shows a flowchart for detecting whether a pressure sensor in a gas meter has a fault in a gas leakage detection method according to an embodiment of the present disclosure; and is
Fig. 8 shows a flow chart for detecting whether there is a leak downstream of the gas meter in the gas leak detection method according to an embodiment of the present disclosure;
fig. 9 shows a flowchart for detecting whether there is a leak downstream of the gas meter in the gas leak detection method according to another embodiment of the present disclosure.
Detailed Description
In order to make 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 described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word covers the element or item listed after the word and its equivalents, without excluding 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 case 110 having a gas inlet 111 and a gas outlet 112, a movement 120 accommodated in the case 110, an inlet valve 150 provided at the gas inlet 111 to control gas to enter the gas meter, and an outlet valve 160 provided at the gas outlet 112 to control gas to flow out of the gas meter. The gas inlet 111 is connected to a gas inlet pipe, and the gas outlet 112 is connected to a gas outlet pipe to connect a gas meter into a gas piping system. Further, the gas outlet pipe may be connected to a gas using device to supply gas to the gas using device via a gas meter. The gas flows to the gas using equipment via the gas inlet duct, the gas inlet 111, the movement 120, the gas outlet 112, and the gas outlet duct. In the present disclosure, "upstream" and "downstream" are defined with such a gas flow path. If one component is located before another component in the gas flow path, the one component is located upstream of the other component. Conversely, if one component is located behind another component in 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 combination. 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 be opened together or closed 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 and downstream of the inlet valve 150, a second pressure sensor 140 disposed near the outlet valve 160 and upstream of the outlet valve 160, a third pressure sensor 170 disposed near the outlet valve 160 and downstream of the outlet valve 160, and a fourth pressure sensor 180 disposed near the inlet valve 150 and upstream of the inlet valve 150. The first pressure sensor 130 is used for sensing the pressure of gas entering the movement 120 through the inlet valve 150 at the upstream of the movement 120, the second pressure sensor 140 is used for sensing the pressure of gas exiting the movement 120 from the outlet valve 160 at the downstream of the movement 120, the third pressure sensor 170 is used for sensing the pressure of gas in the housing 110 of the gas meter through the outlet valve 160, and the fourth pressure sensor 180 is used for sensing the pressure of gas entering the housing 110 of the gas meter but not passing through the inlet valve 150.
It is to 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 a third pressure sensor 170 and a 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 the 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 also be communicatively coupled to the movement 120 to receive the measured flow rate of the gas meter.
The inventors have found that the gas meter can be used to detect a gas leak, for example, a gas leak in the gas meter itself, a gas pipe or a gas-using device downstream of the gas meter, and the like. For example, the presence or absence of gas leakage may be detected based on the pressure measurements of the first, second, third, and fourth pressure sensors 130, 140, 170, 180 and the measured flow rate of the gas meter.
Fig. 2 shows a flow chart of detecting whether there is a leakage in the inlet valve 150 of the gas meter in the gas leakage detection method according to an embodiment of the present disclosure. As shown in fig. 2, the process of detecting whether the inlet valve 150 of the gas meter has a leak includes:
step S21, controlling the inlet valve 150 to open and the outlet valve 160 to open;
step S22, opening gas-using equipment at the downstream of the gas meter;
step S23, controlling the inlet valve 150 to close;
step S24, shutting down the gas equipment after the gas equipment is flamed out;
step S25, controlling the outlet valve 160 to close;
step S26 of detecting at least one of a first variation value and a first difference variation value, the first variation value being a variation value of the first pressure measurement value of the first pressure sensor 130 in the first time period, the first difference variation value being a variation value of 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 in the first time period; and
step S27, comparing the first variation value with a first threshold variation value, or comparing the first difference variation value with a 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 the inlet valve 150 has a leak, otherwise, it is determined that the inlet valve 150 has no leak.
After step S25, both the inlet valve 150 and the outlet valve 160 of the gas meter are closed, and since the gas-using equipment consumes most of the gas at step S24, there is almost no gas between the downstream of the inlet valve 150 and the upstream of the outlet valve 160 of the gas meter. Therefore, 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, a change in the first pressure measurement value in step S26 may refer to an increase in the first pressure measurement value, and a 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 refer to an increase in the difference.
Therefore, by operating the inlet valve 150, the outlet valve 160, and the gas-using equipment downstream of the gas meter, and based on a 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 time period, 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 time period after the first pressure measurement value and/or the second pressure measurement value are stabilized for a certain period of time, so as to avoid interference with disturbance factors such as operation of the outlet valve 160 and ensure accuracy of detection.
It should be noted that the variation value of a parameter in a period of time may refer to the difference between the value of a parameter at the beginning of a period of time and the value after a period of time, or may refer to the difference between the maximum value and the 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 the outlet valve 160 of the gas meter has a leak includes:
step S31, controlling the inlet valve 150 to be opened, controlling the outlet valve 160 to be opened, and closing gas-using equipment at the 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 equipment at the downstream of the gas meter;
step S34, shutting down the gas equipment after the gas equipment to be used is flamed out;
step S35 of detecting at least one of a second variation value and a second difference variation value, the second variation value being a variation value of the second pressure measurement value of the second pressure sensor 140 over a second period of time, and the second difference variation value being 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 a second threshold variation value or comparing the second difference variation value with a 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 there is a leak in the outlet valve 160, otherwise, it is determined that there is no leak in the outlet valve 160.
After step S32, both the inlet valve 150 and the outlet valve 160 of the gas meter are closed, and gas at a certain pressure value exists between the inlet valve 150 and the outlet valve 160 of the gas meter. Therefore, 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 the outlet valve 160 has a leak. Specifically, a change in the second pressure measurement value in step S35 refers to a decrease in the second pressure measurement value, and a 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 refer to a decrease in the difference.
Further, by turning on the gas using equipment downstream of the gas meter at step S33 and then turning off the gas using equipment after the gas using equipment 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 determined more accurately, and the safety of the method can be improved.
Therefore, by operating the inlet valve 150, the outlet valve 160, and the gas-using equipment downstream of the gas meter, and based on a change in the second pressure measurement value of the second pressure sensor 140 over the second period of time, or based on a 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 process of detecting whether there is a leak at the outlet valve 160 of the gas meter may be performed upon determining that there is no leak at the inlet valve 150 of the gas meter.
For example, in step S35, the detection of the first pressure measurement value and the second pressure measurement value may be started within the second time period after the first pressure measurement value and the second pressure measurement value are stabilized for a certain period of time, so as to avoid interference with disturbance factors such as the operation of the outlet valve 160 and the inlet valve 150, and ensure the accuracy of the detection.
Fig. 4 shows a flowchart for detecting whether a pressure sensor has a fault in a gas leakage detection method 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 the outlet valve 160 to be closed;
step S42 of 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 a 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, otherwise, determining that the first pressure sensor 130 and the second pressure sensor 140 has no fault.
In a variant example, step S42 may further comprise detecting a fourth pressure measurement of the fourth pressure sensor 180, and step S43 may further comprise comparing a pressure difference between two of the first, second and fourth pressure measurements with a respective threshold pressure difference, wherein a fault is determined for at least one of the two pressure sensors when the respective pressure difference is greater than the respective threshold pressure difference.
After step S41, the inlet valve 150 and the outlet valve 160 of the gas meter are opened, and the first pressure sensor 130, the second pressure sensor 140, and the fourth pressure sensor 180 are all at the gas supply pressure. Thus, if the difference between the two exceeds a threshold pressure difference, it may be determined that at least one pressure sensor is malfunctioning. The threshold pressure differences corresponding to the pressure differences between the first, second, and fourth pressure measurements may be the same or different.
Therefore, 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 the pressure sensor of the gas meter has a failure may be performed in a case where it is determined that there is no leak at the outlet valve 160 of the gas meter.
Fig. 5 shows a flow chart of detecting whether there is a leak downstream of the gas meter in the 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 be opened, controlling the outlet valve 160 to be opened, and closing all gas-using equipment at the downstream of the gas meter;
step S52, controlling the inlet valve 150 to close;
step S53 of detecting at least one of a third variation value, a fourth variation value, and a third difference variation value, the third variation value being a variation value of the first pressure measurement value of the first pressure sensor 130 in the third period of time, the fourth variation value being a variation value of the second pressure measurement value of the second pressure sensor 140 in the third period of time, the third difference variation value being a variation value of 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 in the third period of time;
and S54, comparing the third change value with a third threshold change value, comparing the fourth change value with a fourth threshold change value, or comparing the third difference change value with a third difference threshold change value, when the third change value is larger than the third threshold change value, the fourth change value is larger than the fourth threshold change value, and the third difference change value is larger than the third difference threshold change value, determining that the leakage exists at the downstream of the detected gas meter, otherwise, determining that the leakage does not exist at the downstream of the gas meter.
After step S52, the inlet valve 150 and the outlet valve 160 of the gas meter are closed, and gas at a certain pressure value exists between the gas meter and the gas-consuming equipment (including the pipe connecting the gas meter and the gas-consuming equipment) at the downstream of the gas meter. Therefore, 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, a change in the third pressure measurement value and the fourth pressure measurement value in step S53 means that the respective pressure measurement values decrease.
Therefore, by operating the inlet valve 150, the outlet valve 160, and the gas-using equipment 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 time period, a leak downstream of the gas meter is simply and conveniently detected.
For example, the above-described process of detecting whether there is a leak at the 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 there is no malfunction in the respective pressure sensors.
For example, in step S52 and in step S53, after the first pressure measurement value and the second pressure measurement value are stabilized, the inlet valve 150 may be controlled to close again, so as to avoid interference with disturbance factors such as operation of the gas equipment and operation of the inlet valve 150, and ensure accuracy of detection.
Fig. 6 shows a flow chart of detecting whether there is leakage in the inlet valve 150 and the outlet valve 160 of the gas meter in the gas leakage detection method according to an embodiment of the present disclosure. As shown in fig. 6, the process of detecting whether there is a leakage in both the inlet valve 150 and the outlet valve 160 of the gas meter includes:
step S61, controlling the inlet valve 150 to be opened, controlling the outlet valve 160 to be opened, and opening the gas-using equipment at the downstream of the gas meter;
step S62, controlling the inlet valve 150 and the outlet valve 160 to be closed simultaneously;
s63, closing the gas equipment after the gas equipment is flamed out;
step S64, detecting a fifth variation value of the third pressure measurement value of the third pressure sensor 170 in a fourth time period; and
and step S65, 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 the inlet valve 150 and the outlet valve 160 have the leakage at the same time, otherwise, it is determined that the inlet valve 150 and the outlet valve 160 do not have the leakage at the same time.
This process is particularly suitable for gas meters in which 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 the gas-using appliance consumes most of the gas 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 in the inlet valve 150 and the outlet valve 160. Specifically, for example, a change in the third pressure measurement value in step S65 means that the third pressure measurement value is increased.
Therefore, by operating the inlet valve 150, the outlet valve 160, and the gas-using equipment 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, the leakage of the inlet valve 150 and the outlet valve 160 of the gas meter is simply and conveniently detected.
For example, in step S64, the third pressure measurement value may be detected for a fourth time period after the third pressure measurement value is stabilized for a certain period of time, so as to avoid interference with disturbance factors such as the operation of the outlet valve 160 and ensure the accuracy of detection.
Fig. 7 shows a flowchart for detecting whether a pressure sensor has a fault in a gas leakage detection method 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 be opened, controlling the outlet valve 160 to be opened, and closing the gas-using equipment at the downstream of the gas meter;
step S72 of 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 a pressure difference between the third pressure measurement value and the fourth pressure measurement value with a second threshold pressure difference, wherein it is determined that at least one of the third pressure sensor 170 and the fourth pressure sensor 180 is faulty when the pressure difference between the third pressure measurement value and the fourth pressure measurement value is greater than the second threshold pressure difference.
After step S71, the inlet valve 150 and the outlet valve 160 of the gas meter are both opened, and the third and fourth pressure sensors 180 are both at the gas supply pressure. Thus, if the difference between the two exceeds a threshold pressure difference, it may be determined that at least one pressure sensor is malfunctioning.
Therefore, 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 the pressure sensor of the gas meter has a failure may be performed in a case where it is determined that there is no leak at the inlet valve and the outlet valve 160 of the gas meter.
Fig. 8 shows a flow chart of detecting whether there is a leak downstream of the gas meter in the 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, controlling the inlet valve 150 and the outlet valve 160 to be opened, and controlling all gas-using equipment at the downstream of the gas meter to be closed;
step S82, detecting the measurement flow of the gas meter, a third pressure measurement value of a third pressure sensor 170 and a fourth pressure measurement value of a fourth pressure sensor 180;
and S83, comparing the measured flow with a threshold measured flow, and comparing the measured pressure difference of the third pressure measured value and the fourth pressure measured value 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, the leakage at the downstream of the gas meter is determined to be detected.
After step S81, both the inlet valve 150 and the outlet valve 160 of the gas meter are opened, but the gas-using 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, it is an indication that gas flow is present, thereby determining that a leak is present downstream of the gas meter.
Therefore, by operating the inlet valve 150, the outlet valve 160, and the gas-using equipment 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 pick-up flow rate of the gas meter.
Fig. 9 shows a flow chart for detecting whether there is a leak downstream of the 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-using equipment at the 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 a fifth time 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, the fact that the leakage exists at the downstream of the gas meter is determined.
After step S93, the inlet valve 150 and the outlet valve 160 of the gas meter are both closed, and the gas-using equipment downstream of the gas meter is also closed. Therefore, if the variation value of the third pressure measurement value of the third pressure sensor 170 exceeds the threshold value, it can be determined that there is a leak downstream of the gas meter.
At least one embodiment of the present disclosure also includes a gas system including a gas meter, a gas-using 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-using device to perform the above-described 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 to a remote server, mobile terminal, etc., for example, to issue an alarm message upon detection of the occurrence of a gas leak. In some embodiments, the parameters such as the time period, the threshold variation value, the threshold pressure difference, the threshold flow rate, etc. may be set by a 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 not defined by the above-described embodiments but is defined by the appended claims and equivalents thereof.
Claims (12)
1. A method for monitoring gas leakage by using a gas meter,
the gas meter comprises:
the inlet valve is arranged at a gas inlet of the gas meter to control gas to flow into the gas meter; and
the outlet valve is arranged at a gas outlet of the gas meter to control gas to flow 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 comprises the following steps:
controlling the inlet valve to open and the outlet valve to open;
opening gas using equipment at the downstream of the gas meter;
controlling the inlet valve to close;
closing the gas utilization equipment after the gas utilization equipment is flamed out;
controlling the outlet valve to close; and
and determining whether the inlet valve of the gas meter has leakage or not by detecting the pressure from the downstream of the inlet valve to the upstream of the outlet valve in the gas meter.
2. The detection method according to claim 1,
the gas table still includes:
a first pressure sensor disposed adjacent to the inlet valve, downstream of the inlet valve; and
a second pressure sensor disposed near the outlet valve and upstream of the outlet valve, the determining whether the inlet valve of the gas meter has a leak by detecting a pressure in the gas meter from downstream of the inlet valve to upstream of the outlet valve, comprising:
detecting one or both of a first change value and a first difference change value, the first change value being a change in a first pressure measurement of a first pressure sensor over a first time period, the first difference change value being a change in a difference between a first pressure measurement of the first pressure sensor and a second pressure measurement of a second pressure sensor over the first time period;
comparing the first change value to a first threshold change value or comparing the first difference change value to a first difference threshold change value, wherein the inlet valve is determined to have a leak when the first change value exceeds the first threshold change value or the first difference change value exceeds the first difference threshold change value.
3. The detection method of claim 2, further comprising
Whether the outlet valve of detecting gas table exists the leakage, it includes:
controlling the inlet valve to be opened, controlling the outlet valve to be opened and closing the gas-using equipment at the downstream of the gas meter;
controlling the inlet valve and the outlet valve to be closed simultaneously;
detecting one or both of a second change value and a second difference change value, the second change value being a change in a second pressure measurement of a second pressure sensor over a second time period, the second difference change value being a change in a difference between a first pressure measurement of the first pressure sensor and a second pressure measurement of the second pressure sensor over the second time period;
and comparing the second change value with a second threshold change value or comparing the second difference change value with a second difference threshold change value, wherein the outlet valve is determined to have a leak when the second change value exceeds the second threshold change value or the second difference change value exceeds the second difference threshold change value.
4. The detection method according to claim 3,
detecting whether the outlet valve of the gas meter leaks or not, and the method also comprises
After the inlet valve and the outlet valve are controlled to be closed simultaneously, the gas-using equipment at the downstream of the gas meter is opened before one or both of the second change value and the second difference change value are detected, and the gas-using equipment is closed after the gas-using equipment is extinguished.
5. The detection method of claim 2, further comprising:
detecting whether there is a failure in at least one of the first pressure sensor and the second pressure sensor, comprising:
controlling the inlet valve to open and the outlet valve to close;
detecting a first pressure measurement of a first pressure sensor and detecting a second pressure measurement of a second pressure sensor; and
comparing a 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, determining that a fault exists in at least one of the first pressure sensor and the second pressure sensor.
6. The detection method according to claim 2, wherein the detection signal is a signal,
the gas table still includes:
a fourth pressure sensor disposed in the vicinity of the inlet valve upstream of the inlet valve,
the detection method further includes detecting whether there is a failure in at least one of the first pressure sensor, the second pressure sensor, and the fourth pressure sensor, including:
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 a pressure difference between the first pressure measurement, the second pressure measurement, and the fourth pressure measurement to 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.
7. The detection method according to any one of claims 2 to 6, further comprising detecting whether there is a leak downstream of the gas meter, comprising:
controlling the inlet valve to be opened, controlling the outlet valve to be opened, and closing all gas-using equipment at the downstream of the gas meter;
controlling the inlet valve to close;
detecting at least one of a third variation value, a fourth variation value and a third difference variation value, wherein the third variation value is a variation value of the first pressure measurement value of the first pressure sensor in a third time period, the fourth variation value is a variation value of the second pressure measurement value of the second pressure sensor in the third time period, and the third difference variation value is a variation value of the difference value between the first pressure measurement value and the second pressure measurement value in the third time period; and
and comparing the third change value with a third threshold change value, or comparing the fourth change value with a fourth threshold change value, or comparing the third difference change value with a third difference threshold change value, wherein when the third change value is greater than the third threshold change value, or the fourth change value is greater than the fourth threshold change value, or the third difference change value is greater than the third difference threshold change value, it is determined that the leakage exists at the downstream of the gas meter.
8. A method for monitoring gas leakage by using a gas meter,
the gas meter comprises:
the inlet valve is arranged at a gas inlet of the gas meter to control gas to flow into the gas meter;
the outlet valve is arranged at the gas outlet of the gas meter to control the gas to flow out of the gas meter; and
a third pressure sensor disposed in the vicinity of the outlet valve and downstream of the outlet valve, the detection method including detecting whether or not there is a leak in both the inlet valve and the outlet valve of the gas meter, including:
controlling the inlet valve to be opened, controlling the outlet valve to be opened, and opening the gas using equipment at the downstream of the gas meter;
controlling the inlet valve and the outlet valve to be closed simultaneously;
closing the gas utilization equipment after the gas utilization equipment is flamed out;
detecting a fifth change in the third pressure measurement of the third pressure sensor over 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 the inlet valve and the outlet valve have leaks at the same time.
9. The detection method according to claim 8, wherein the detection signal is a signal,
the gas table still includes:
a fourth pressure sensor disposed in proximity to the inlet valve, upstream of the inlet valve, the detection method further comprising detecting whether a fault exists in at least one of the third pressure sensor and the fourth pressure sensor, comprising:
controlling the inlet valve to be opened, controlling the outlet valve to be opened, and closing the gas-using equipment at the 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 a pressure difference between the third pressure measurement and the fourth pressure measurement to a second threshold pressure difference, wherein a determination is made that at least one of the third pressure sensor and the fourth pressure sensor is malfunctioning when the pressure difference between the third pressure measurement and the fourth pressure measurement is greater than the second threshold pressure difference.
10. The detection method according to claim 8 or 9,
the gas table still includes:
a fourth pressure sensor disposed in the vicinity of the inlet valve and upstream of the inlet valve, the detection method further comprising detecting whether or not 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-using equipment at the downstream of the gas meter to be closed;
detecting the measurement flow of the 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 with a threshold measured flow rate, and comparing a measured pressure difference of the third pressure measured value and the fourth pressure measured value with a third threshold pressure difference, wherein it is determined that there is a leak downstream of the gas meter when the measured flow rate exceeds the threshold measured flow rate or the measured pressure difference is greater than the third threshold pressure difference.
11. The detection method according to claim 8 or 9,
the detection method also comprises the step of detecting whether the downstream of the gas meter has leakage or not, and the detection method comprises the following steps:
controlling the inlet valve and the outlet valve to be opened, and controlling all gas-using equipment at the downstream of the gas meter to be closed;
controlling the inlet valve and the outlet valve to close;
detecting a sixth change in a third pressure measurement from the third pressure sensor over a fifth time period;
and comparing the sixth change value with a sixth threshold change value, wherein when the sixth change value exceeds the sixth threshold change value, the leakage at the downstream of the gas meter is determined to be detected.
12. A gas-fired system, comprising:
a gas meter;
a gas using device; and
a controller configured to perform the detection method of any one of claims 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968704.2A CN115560927B (en) | 2022-08-12 | 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 | 2022-08-12 | Gas leakage detection method and gas system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115560927A true CN115560927A (en) | 2023-01-03 |
| CN115560927B CN115560927B (en) | 2024-05-31 |
Family
ID=84738367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210968704.2A Active CN115560927B (en) | 2022-08-12 | 2022-08-12 | Gas leakage detection method and gas system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115560927B (en) |
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 |
-
2022
- 2022-08-12 CN CN202210968704.2A patent/CN115560927B/en active Active
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115560927B (en) | 2024-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10851993B2 (en) | Gas valve with overpressure diagnostics | |
| US10697632B2 (en) | Gas valve with communication link | |
| JP6005062B2 (en) | Fluid leak detection system | |
| US20190063689A1 (en) | Leak detection device and method | |
| US9846440B2 (en) | Valve controller configured to estimate fuel comsumption | |
| US8905063B2 (en) | Gas valve with fuel rate monitor | |
| US8947242B2 (en) | Gas valve with valve leakage test | |
| US8839815B2 (en) | Gas valve with electronic cycle counter | |
| US9074770B2 (en) | Gas valve with electronic valve proving system | |
| US9995486B2 (en) | Gas valve with high/low gas pressure detection | |
| US8899264B2 (en) | Gas valve with electronic proof of closure system | |
| JPH0961284A (en) | Pipe leakage monitor | |
| WO2010087185A1 (en) | Gas shutoff device | |
| CN109612111B (en) | Method for controlling gas water heater with storage tank | |
| JP5428518B2 (en) | Gas shut-off device | |
| CN115560927B (en) | Gas leakage detection method and gas system | |
| JP4439195B2 (en) | Utility consumer equipment operation recognition device | |
| JP2022015555A (en) | Gas leakage inspection system | |
| JPH08201128A (en) | Gas leakge alarm inspection system | |
| 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 | |
| CN115560921A (en) | Method for monitoring gas leakage, method for detecting abnormal installation and gas meter | |
| JP2010169461A (en) | System for detecting gas leak | |
| JP5310035B2 (en) | Gas shut-off device | |
| Murvay et al. | Design and implementation of a reliable gas leak detection system for domestic environments |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |