CN112082707A - Gas tiny-less leakage detection device and gas tiny-less leakage detection system - Google Patents
Gas tiny-less leakage detection device and gas tiny-less leakage detection system Download PDFInfo
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Abstract
The invention provides a method and a device for detecting minute gas leakage, which can improve the accuracy of leakage judgment by further considering the surrounding environment (especially the temperature environment) of a gas supply path. The gas minute leakage detection device is provided with: a gas flow rate acquisition unit (10) that acquires the flow rate of the gas in the gas flow path (3); a pressure detection unit (20); a temperature detection unit (30); an alarm unit (40); and a control unit (50) that counts the number of the flow rate counter (52C), the no-pressure-rise counter (52B), and the temperature-rise counter (52A) at each first period, and determines whether or not to cause the alarm unit (40) to alarm, based on the value of the no-pressure-rise counter and the value of the temperature-rise counter, when the value of the no-pressure-rise counter reaches a first predetermined value.
Description
Technical Field
The invention relates to a gas tiny leakage detection device and a gas tiny leakage detection system.
Background
Conventionally, high-pressure gas such as LP gas (liquefied propane gas or the like) contained in a gas tank is supplied to a gas appliance such as a cooking stove through a pipe. In addition, for example, patent document 1 discloses a technique for detecting a slight gas leak in such a gas supply system. Thus, the pressure detection means is provided in the gas supply path, and when the detection result is equal to or less than a predetermined value within a predetermined period, it is determined that gas leakage has occurred.
That is, according to boyle's law and charles' law, it is known that, particularly in a situation where the gas in the gas supply path is sealed without being used, the gas pressure in the gas supply path changes according to the temperature change of the ambient environment. Therefore, when the fluctuation of the gas pressure is extremely small for a predetermined period (for example, 1-week period), it can be estimated that there is a possibility that a leak may occur somewhere in the gas supply path. In brief, if the gas in the gas supply path is continuously observed for a long period of time, a pressure change should occur with a temperature change, and if a large pressure change does not occur during this period, it can be estimated that a gas leak of the relief pressure has occurred. The technical idea related to patent document 1 is based on this principle.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 4-93739
Disclosure of Invention
Problems to be solved by the invention
However, there are cases where the place where the gas supply path is installed is originally an environment that lacks a temperature change, such as a case where the gas supply path is buried deep in the ground. In this case, since the temperature change of the gas is small, the pressure change of the gas is small even if observed for a long time. Therefore, according to the technique of patent document 1, even if gas leakage does not occur, it is erroneously determined that there is gas leakage on condition that the variation in gas pressure over a long period of time is small. As a result, the maintenance worker goes to the site to perform unnecessary inspection and repair of the gas supply path, which is undesirable.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a minute gas leakage detection device and a minute gas leakage detection system capable of improving the accuracy of leakage determination in consideration of the surrounding environment (particularly, the temperature environment) of a gas supply path.
For resolving questionsScheme of questions
The invention relates to a gas slight leakage detection device, which comprises: a gas flow rate obtaining unit that obtains a flow rate of the gas in the gas flow path; a pressure detection unit that detects a gas pressure in the gas flow path; a temperature detection unit that detects a gas temperature in the gas flow path; an alarm unit; and a control section, wherein the control section has: a flow rate counter that counts when the flow rate acquired by the gas flow rate acquisition unit is not zero in a predetermined first period, and resets when the flow rate is zero; a non-pressure-rise counter that counts when a rise value of the gas pressure detected by the pressure detection unit does not become equal to or greater than a predetermined first pressure threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the rise value becomes equal to or greater than the first pressure threshold value; and a temperature increase counter that counts when it is determined that an increase value of the gas temperature detected by the temperature detection unit is equal to or greater than a first temperature threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the increase value is equal to or greater than the first pressure threshold value, the control unit is configured to: the flow rate counter, the non-pressure-rise counter, and the temperature-rise counter are counted for each of the first periods, and when the value of the non-pressure-rise counter reaches a first predetermined value, it is determined whether or not to cause the alarm unit to alarm based on the value of the flow rate counter and the value of the temperature-rise counter.
With this configuration, the accuracy of gas leak detection can be improved. That is, even if the rise value of the gas pressure is smaller than the first pressure threshold value during the first period (for example, twenty-four hours), if the gas temperature hardly changes during the first period, it is estimated that the cause of the small change in the gas pressure is the small change in the gas temperature.
Therefore, in the gas minute leakage detection device according to the present invention, the accuracy of gas leakage detection can be improved as compared with the invention disclosed in patent document 1 by considering that the counted temperature rise counter value is present.
Further, a gas minute leakage detection system according to the present invention includes: a monitoring center; and a gas minute leakage detection device having a gas flow rate acquisition unit that acquires a flow rate of gas in a gas flow path, a pressure detection unit that detects a pressure of gas in the gas flow path, a temperature detection unit that detects a temperature of gas in the gas flow path, an alarm unit, a wireless module that transmits and receives with the monitoring center, and a control unit, wherein the control unit has: a flow rate counter that counts when the flow rate acquired by the gas flow rate acquisition unit is not zero in a predetermined first period, and resets when the flow rate is zero; a non-pressure-rise counter that counts when a rise value of the gas pressure detected by the pressure detection unit does not become equal to or greater than a predetermined first pressure threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the rise value becomes equal to or greater than the first pressure threshold value; and a temperature increase counter that counts when it is determined that an increase value of the gas temperature detected by the temperature detection unit is equal to or greater than a first temperature threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the increase value is equal to or greater than the first pressure threshold value, the control unit is configured to: performing counting of the flow rate counter, the no-pressure-rise counter, and the temperature-rise counter for each of the first periods, and outputting a first signal requesting permission of the alarm unit to issue a warning from the wireless module to the monitoring center when a value of the no-pressure-rise counter reaches a first predetermined value, the monitoring center being configured to: when the first signal is input from the control unit, it is determined whether or not to cause the alarm unit to alarm, based on the value of the current-rate counter and the value of the temperature-rise counter.
With this configuration, the accuracy of gas leak detection can be improved. That is, even if the rise value of the gas pressure is smaller than the first pressure threshold value during the first period (for example, twenty-four hours), if the gas temperature hardly changes during the first period, it is estimated that the cause of the small change in the gas pressure is the small change in the gas temperature.
Therefore, in the gas minute leakage detection system according to the present invention, by considering the temperature rise counter value obtained by counting, it is possible to suppress erroneous detection of gas leakage and improve the accuracy of gas leakage detection compared to the invention disclosed in patent document 1.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a minute gas leakage detection device and a minute gas leakage detection system capable of improving the accuracy of leakage determination in consideration of the surrounding environment (particularly, the temperature environment) of the gas supply path.
Drawings
Fig. 1 is a schematic diagram showing an example of a gas supply system to which the gas minute leakage detection device according to embodiment 1 can be applied.
Fig. 2 is a schematic diagram showing a schematic configuration of the gas minute leak detection apparatus shown in fig. 1.
Fig. 3A is a flowchart illustrating an example of the operation of the gas minute leak detection device according to embodiment 1.
Fig. 3B is a flowchart illustrating an example of the operation of the gas minute leak detection device according to embodiment 1.
Fig. 3C is a flowchart illustrating an example of the operation of the gas minute leak detection device according to embodiment 1.
Fig. 4 is a schematic diagram showing a schematic configuration of the gas minute leak detection system according to embodiment 2.
Fig. 5A is a flowchart illustrating an example of the operation of the gas slight-leakage detecting device in the gas slight-leakage detecting system according to embodiment 2.
Fig. 5B is a flowchart showing an example of the operation of the gas slight-leakage detecting device in the gas slight-leakage detecting system according to embodiment 2.
Fig. 5C is a flowchart showing an example of the operation of the gas slight-leakage detecting device in the gas slight-leakage detecting system according to embodiment 2.
Fig. 6 is a flowchart showing an example of the operation of the monitoring center in the gas small leak detection system according to embodiment 2.
Description of the reference numerals
1: a gas storage tank: 2: a pressure adjustment part; 3: a gas flow path; 5: a gas valve; 6: a gas appliance; 10: a gas flow rate acquisition unit; 20: a pressure detection unit; 30: a temperature detection unit; 40: an alarm unit; 50: a control unit; 51: a calculation unit; 52A: a temperature rise counter; 52B: a no pressure rise counter; 52C: a flow counter is arranged; 52: a storage unit; 53: a wireless module; 60: a control unit; 61: a calculation unit; 62: a storage unit; 63: a wireless module; 100: a gas slight leakage detection device; 110: a monitoring center; 200: a gas supply system; 300: gas slight leakage detection system.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals throughout the drawings, and redundant description thereof will be omitted. In addition, in all the drawings, components necessary for explaining the present invention are selected and illustrated, and other components may not be illustrated. The present invention is not limited to the following embodiments.
(embodiment mode 1)
The gas minute leakage detection device according to embodiment 1 includes: a gas flow rate obtaining unit that obtains a flow rate of the gas in the gas flow path; a pressure detection unit that detects a gas pressure in the gas flow path; a temperature detection unit that detects a gas temperature in the gas flow path; an alarm unit; and a control section, wherein the control section has: a flow rate counter that counts when the flow rate acquired by the gas flow rate acquisition unit is not zero in a predetermined first period, and resets when the flow rate is zero; a non-pressure-rise counter that counts when a rise value of the gas pressure detected by the pressure detection unit does not become equal to or greater than a predetermined first pressure threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the rise value becomes equal to or greater than the first pressure threshold value; and a temperature increase counter that counts when it is determined that the increase value of the gas temperature detected by the temperature detection unit is equal to or greater than a first temperature threshold value after the flow rate acquired by the gas flow rate acquisition unit is zero in the first period, and resets when the increase value is equal to or greater than a first pressure threshold value, the control unit is configured to: the method includes counting a flow counter, a non-pressure-rise counter, and a temperature-rise counter at each first period, and determining whether to cause an alarm unit to alarm based on a value of the flow counter and a value of the temperature-rise counter when a value of the non-pressure-rise counter reaches a first predetermined value.
In the gas slight leakage detection device according to embodiment 1, the control unit may be configured to: when the value of the no-pressure-rise counter reaches a first predetermined value and the temperature-rise counter is equal to or greater than a second predetermined value, the alarm unit is caused to alarm.
In the gas slight leakage detection device according to embodiment 1, the control unit may be configured to: the alarm unit alarms when the value of the no-pressure-rise counter reaches a first predetermined value, the temperature-rise counter is smaller than a second predetermined value, and the value of the flow rate counter is equal to or greater than a third predetermined value.
In the gas slight leakage detection device according to embodiment 1, the control unit may be configured to: when the value of the flow rate counter reaches a fourth predetermined value, the alarm unit is caused to alarm.
An example of the gas minute leak detection device according to embodiment 1 will be described in detail below with reference to the drawings.
[ Structure of gas minute leakage detection device ]
First, the configuration of a gas supply system including the gas minute leakage detection device according to the present embodiment will be described with reference to fig. 1.
Fig. 1 is a schematic diagram showing an example of a gas supply system to which the gas minute leakage detection device according to embodiment 1 can be applied.
As shown in fig. 1, in the gas supply system 200, a gas discharge port of a gas tank 1 that accommodates LP gas or the like is connected to an upstream end of a gas pipe that forms a gas flow path 3 via a pressure adjustment portion 2. A gas minute leakage detection device 100 is attached to a middle portion of the gas flow path 3, and a downstream end of the gas flow path 3 is connected to a gas appliance 6 such as a gas burner through a gas plug 5, for example.
Next, a gas minute leakage detection device according to embodiment 1 will be described with reference to fig. 2.
Fig. 2 is a schematic diagram showing a schematic configuration of the gas minute leak detection apparatus shown in fig. 1.
As shown in fig. 2, the gas minute leakage detection device 100 according to embodiment 1 includes a gas flow rate acquisition unit 10, a pressure detection unit 20, a temperature detection unit 30, an alarm unit 40, and a control unit 50.
The gas flow rate acquisition unit 10 may be constituted by a known flow rate measurement unit, for example. The gas flow rate acquisition unit 10 may be configured by a flow rate measurement unit and a memory that stores flow rate information detected by the flow rate measurement unit and calculated by the control unit 50, or may be configured to perform load measurement by transmitting and receiving information to and from a monitoring center. As the flow rate measurement unit, for example, a flow rate measurement unit having a transmitter/receiver including an ultrasonic transducer and an oscillation circuit including a crystal transducer or the like can be used.
The pressure detection unit 20 can be a known pressure detection unit that measures the pressure of the gas flowing through the gas flow path 3. The temperature detector 30 may be a known temperature detector that measures the temperature of the gas flowing through the gas channel 3.
The temperature detection unit may be provided separately for detecting gas leakage, such as the temperature detection unit 30 illustrated in the present embodiment, but is not limited thereto. For example, a form in which the temperature of the gas is measured based on an output from a separately provided device may also be employed. For example, since the oscillation frequency of the crystal resonator or the like included in the gas flow rate obtaining unit 10 has a predetermined temperature characteristic, the temperature of the gas can be obtained from the oscillation frequency by obtaining the relationship between the oscillation frequency and the temperature in advance. In this way, the temperature of the gas can be acquired from the output (oscillation frequency) of the crystal oscillator of the gas flow rate acquisition unit 10 without providing a dedicated temperature detection unit.
The alarm unit 40 may have any configuration as long as it can notify an alarm to the outside. The notification to the outside may be performed by, for example, displaying character data, image data, or the like on a display unit (screen) of the gas minute leak detection device 100, by a sound such as a speaker or an alarm, or by light or color. Note that the notification may be performed by mail or an application via a communication network to a smartphone, a mobile phone, a tablet pc, or the like.
The control unit 50 may be constituted by a microcomputer, an MPU, a PLC (Programmable Logic Controller), a Logic circuit, or the like. The control unit 50 includes an arithmetic unit 51 and a storage unit 52. The arithmetic unit 51 may be a CPU or the like, and the storage unit 52 may be a known memory such as a ROM and/or a RAM. The operation unit 51 executes a predetermined program or the like stored in the storage unit 52, thereby realizing the temperature increase counter 52A, the no-pressure increase counter 52B, and the flow counter 52C.
[ operation (operation method) and Effect of gas minute-leakage detecting device ]
Next, the operation and the operational effects of the gas minute leak detection device according to embodiment 1 will be described with reference to fig. 1 to 3C.
Fig. 3A to 3C are flowcharts showing an example of the operation of the gas minute leak detection device according to embodiment 1. Note that, the arithmetic unit 51 of the control unit 50 reads the program stored in the storage unit 52 every first period to execute the following operation. Here, the first period is a predetermined period that is set in advance, and may be, for example, two hours, twelve hours, twenty-four hours, or may be a unit of day.
As shown in fig. 3A to 3C, the control unit 50 acquires the flow rate of the gas from the gas flow rate acquisition unit 10 (step S101). Next, the control unit 50 determines whether or not the flow rate of the gas is zero in the first period based on the flow rate of the gas acquired in step S101 (step S102). Here, the term "gas flow rate" refers to not only a state in which no gas flows through the gas flow channel 3, but also a flow rate at which the flow rate value detected by the gas flow rate acquisition unit 10 is substantially zero.
When the control unit 50 determines that the flow rate of the gas is not zero in the first period (no in step S102), the flow counter value (value of the flow counter) of the flow counter 52C is counted (the counter value is incremented by 1).
Next, the control unit 50 acquires a current flow counter value obtained by counting the current flow counter 52C (step S104), and determines whether or not the acquired current flow counter value reaches a preset fourth predetermined value (step S105). Here, the fourth predetermined value can be set as appropriate, and for example, when the first period is twenty-four hours (i.e., 1 day) and is determined for 30 days, the fourth predetermined value is set to 30.
When the control unit 50 determines that the available flow rate counter value acquired in step S104 has reached the fourth predetermined value (step S105: yes), the alarm unit 40 gives an alarm (step S106). In this case, the alarm unit 40 may be configured to alarm the occurrence of gas leakage based on the flow rate measurement. Thereby, the maintenance operator and/or the monitoring center can find an alarm of the gas leakage.
Next, the control unit 50 resets (initializes; sets 0 to the counter value of the flow counter 52C) (step S107), and ends the routine. In addition, the resetting of the flow counter value may also be performed by an instruction from a maintenance worker and/or a monitoring center.
On the other hand, when the control unit 50 determines that the flow rate counter value obtained in step S104 has not reached the fourth predetermined value (no in step S105), the non-pressure-rise counter value (the value of the non-pressure-rise counter) of the non-pressure-rise counter 52B is counted (the counter value is incremented by 1; step S113). When the gas flows through the gas flow path 3, the pressure value cannot be measured, but the non-pressure-rise counter value of the non-pressure-rise counter 52B is counted from the viewpoint of redundancy. The processing after step S113 will be described later.
When the control unit 50 determines that the flow rate of the gas is zero in the first period based on the flow rate of the gas acquired in step S101 (yes in step S102), the current counter value of the current counter 52C is reset (step S108).
Next, the control unit 50 acquires the gas pressure detected by the pressure detection unit 20 (step S109). Next, the control unit 50 determines whether or not the increase value Δ P of the gas pressure during the first period is equal to or greater than a predetermined first pressure threshold value Δ P1 (for example, 20 pascals) based on the gas pressure acquired in step S109 (step S110).
When the control unit 50 determines that the gas pressure increase value Δ P is equal to or greater than the first pressure threshold value Δ P1 in the first period (yes in step S110), the control unit resets the no-pressure-increase counter value of the no-pressure-increase counter 52B (step S111), resets the temperature-increase counter value of the temperature-increase counter 52A (temperature counter value) (step S112), and ends the routine.
On the other hand, when the control unit 50 determines that the rise value Δ P of the gas pressure is not equal to or greater than the first pressure threshold value Δ P1 in the first period (step S110: no), the non-pressure-rise counter value of the non-pressure-rise counter 52B is counted (the counter value is incremented by 1; step S113).
Next, the control unit 50 acquires the gas temperature detected by the temperature detection unit 30 (step S114). Next, the control unit 50 determines whether or not the increase value Δ T of the gas temperature in the first period is equal to or greater than a predetermined first temperature threshold value Δ T1 (e.g., 5 ℃) based on the gas temperature acquired in step S114 (step S115).
When the control unit 50 determines that the increase value Δ T of the gas temperature in the first period is equal to or greater than the predetermined first temperature threshold value Δ T1 (yes in step S115), the temperature increase counter value of the temperature increase counter 52A is counted (the counter value is incremented by 1; step S116), and the process of step S117 is executed. On the other hand, if the control unit 50 determines that the increase value Δ T of the gas temperature in the first period is not equal to or greater than the predetermined first temperature threshold value Δ T1 (step S115: no), the process of step S117 is executed.
In step S117, the control unit 50 acquires the no-pressure-rise counter value counted by the no-pressure-rise counter 52B. Next, the control unit 50 determines whether or not the non-pressure-rise counter value acquired in step S117 reaches a preset first predetermined value (step S118). Here, the first predetermined value can be set as appropriate, and for example, when the first period is twenty-four hours (i.e., 1 day) and is determined for 30 days, the first predetermined value is set to 30.
When the control unit 50 determines that the no-pressure-rise counter value has not reached the preset first predetermined value (step S118: no), the routine is terminated. On the other hand, when the control unit 50 determines that the no-pressure-rise counter value has reached the first predetermined value set in advance (step S118: "YES"), the control unit 50 acquires the temperature-rise counter value counted by the temperature-rise counter 52A (step S119).
Next, the control unit 50 determines whether or not the temperature increase counter value acquired in step S119 is equal to or greater than a preset second predetermined value (step S120). Here, the second predetermined value can be set as appropriate, and for example, when the first period is twenty-four hours (i.e., 1 day) and is judged for 5 days, the second predetermined value is set to 5.
When the control unit 50 determines that the temperature increase counter value acquired in step S119 is equal to or greater than the second predetermined value (yes in step S120), it causes the alarm unit 40 to alarm (step S121), and the routine is terminated.
In this case, the alarm unit 40 may be configured to perform an alarm indicating that gas leakage has occurred based on the pressure measurement. When the temperature of the gas rises, the gas pressure should rise, and thus, it can be judged that the gas may leak if the rise in the gas pressure is not detected. Thereby, the maintenance operator and/or the monitoring center can find an alarm of the gas leakage.
Further, as the case where the temperature of the gas does not rise, there are a case where the gas supply path is buried deep in the ground, a case where the gas minute leakage detection device 100 is installed in a place where sunlight is not irradiated, a case where the gas minute leakage detection device is installed in a cold district, and the like as described above.
On the other hand, when the control unit 50 determines that the temperature-rise counter value is smaller than the second predetermined value (step S120: NO), the control unit acquires the current-flow counter value counted by the current-flow counter 52C (step S122).
Next, the control unit 50 determines whether or not the current flow counter value acquired in step S122 is equal to or greater than a preset third predetermined value (step S123). Here, the third predetermined value can be set as appropriate, and when the first period is twenty-four hours (i.e., 1 day) and is determined for 10 days, the third predetermined value is set to 10.
When the control unit 50 determines that the flow counter value is equal to or greater than the third predetermined value (yes in step S123), the alarm unit 40 gives an alarm (step S124), and the routine is terminated. Thereby, the maintenance operator and/or the monitoring center can find an alarm of the gas leakage.
On the other hand, when the control unit 50 determines that the flow rate counter value is not equal to or greater than the third predetermined value (step S123: no), the control unit resets the no-pressure-rise counter value of the no-pressure-rise counter 52B (step S125), and resets the temperature-rise counter value of the temperature-rise counter 52A (step S126), and ends the routine.
In the gas slight leakage detection device 100 according to embodiment 1 configured as described above, when the control unit 50 determines that the non-pressure-rise counter value has reached the first predetermined value (step S118: "yes"), it is configured to determine whether or not to perform an alarm by the alarm unit 40 based on the value of the flow rate counter and the value of the temperature-rise counter.
Specifically, when the control unit 50 determines that the temperature increase counter value is equal to or greater than the second predetermined value (step S120: YES), the alarm unit 40 gives an alarm (step S121). When the temperature of the gas rises, the gas pressure should rise. Therefore, although the temperature of the gas rises, the absence of detection of the rise in the pressure of the gas represents a possibility of judgment that the gas has leaked.
Even if it is determined that the temperature increase counter value is smaller than the second predetermined value (no in step S120), the control unit 50 causes the alarm unit 40 to alarm (step S124) if it is determined that the flow counter value is equal to or larger than the third predetermined value (yes in step S123). Since the period during which the gas flows through the gas flow path 3 is long, it can be determined that there is a possibility of gas leakage.
Thus, the accuracy of gas leak detection can be improved compared to the invention disclosed in patent document 1.
Conversely, the control unit 50 is configured to: even when the non-pressure-rise counter value reaches the first predetermined value (step S118: YES), the alarm unit 40 is not caused to alarm when it is determined that the temperature-rise counter value is smaller than the second predetermined value (step S120: NO) and it is determined that the flow rate counter value is not equal to or larger than the third predetermined value (step S123: NO).
If the temperature of the gas does not rise, the rise in the gas pressure is not detected, and the period during which the gas flows through the gas flow path 3 is not long, it can be determined that gas leakage is unlikely to occur.
Thus, unnecessary inspections can be suppressed. Therefore, compared to the invention disclosed in patent document 1, erroneous detection of gas leakage can be suppressed, and the accuracy of gas leakage detection can be improved.
Further, the control unit 50 may be configured to: the processing of step S114 and step S115 is executed before the processing of step S109 and step S110, and when it is determined that the gas pressure has increased although it is determined that the temperature of the gas has not increased, it is determined that there is a possibility of a failure occurring in the pressure detection unit 20 and/or the temperature detection unit 30, and the alarm unit 40 is caused to issue a warning. This can ensure redundancy compared to the invention disclosed in patent document 1.
(embodiment mode 2)
A minute gas leakage detection system according to embodiment 2 includes a monitoring center and a minute gas leakage detection device, and the minute gas leakage detection device includes: a gas flow rate obtaining unit that obtains a flow rate of the gas in the gas flow path; a pressure detection unit that detects a gas pressure in the gas flow path; a temperature detection unit that detects a gas temperature in the gas flow path; an alarm unit; a wireless module which transmits and receives with the monitoring center; and a control section, wherein the control section has: a flow rate counter that counts when the flow rate acquired by the gas flow rate acquisition unit is not zero in a predetermined first period, and resets when the flow rate is zero; a non-pressure-rise counter that counts when a rise value of the gas pressure detected by the pressure detection unit does not become equal to or greater than a predetermined first pressure threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the rise value becomes equal to or greater than the first pressure threshold value; and a temperature increase counter that counts when it is determined that the increase value of the gas temperature detected by the temperature detection unit is equal to or greater than the first temperature threshold value after the flow rate acquired by the gas flow rate acquisition unit is zero in the first period, and resets when the increase value is equal to or greater than the first pressure threshold value, the control unit is configured to: the monitoring center is configured to perform counting of a flow counter, a no-pressure-rise counter, and a temperature-rise counter at each first period, and output a first signal from the wireless module to the monitoring center when a value of the no-pressure-rise counter reaches a first predetermined value, the first signal requesting permission of the alarm unit to issue a warning, the monitoring center being configured to: when the first signal is input from the control unit, it is determined whether or not to cause the alarm unit to alarm, based on the value of the flow rate counter and the value of the temperature rise counter.
In the gas minute leakage detection system according to embodiment 2, the monitoring center is configured to: when a first signal is input from the control unit, the value of the temperature-rise counter is acquired, and when the acquired value of the temperature-rise counter is equal to or greater than a second predetermined value, a permission signal that permits display of an alarm by the alarm unit is output to the control unit, and the control unit is configured to: when the permission signal is inputted from the monitoring center, the alarm unit gives an alarm.
In the gas minute leakage detection system according to embodiment 2, the monitoring center may be configured to: when a first signal is input from the control unit, a value of a temperature increase counter and a value of a flow rate counter are acquired, and when the acquired value of the temperature increase counter is smaller than a second predetermined value and the value of the flow rate counter is equal to or larger than a third predetermined value, a permission signal that permits the alarm unit to display an alarm is output to the control unit, wherein the control unit is configured to: when the permission signal is inputted from the monitoring center, the alarm unit gives an alarm.
In the gas slight leakage detection system according to embodiment 2, the control unit may be configured to: when the value of the flow rate counter reaches a fourth predetermined value, the alarm unit is caused to alarm.
An example of the gas minute leak detection system according to embodiment 2 will be described in detail below with reference to the drawings.
[ Structure of gas minute leakage detection System ]
Fig. 4 is a schematic diagram showing a schematic configuration of the gas minute leak detection system according to embodiment 2.
As shown in fig. 4, the minute gas leakage detection system 300 according to embodiment 2 includes a minute gas leakage detection device 100 and a monitoring center 110.
The gas slight leakage detection device 100 includes, in the same manner as the gas slight leakage detection device 100 according to embodiment 1: the gas flow rate acquisition unit 10, the pressure detection unit 20, the temperature detection unit 30, the alarm unit 40, and the control unit 50, wherein the control unit 50 further includes a wireless module 53 for transmitting and receiving with the monitoring center 110. The gas slight-leakage detection device 100 according to embodiment 2 is configured in the same manner as the gas slight-leakage detection device 100 according to embodiment 1, and therefore, a detailed description thereof is omitted.
The monitoring center 110 has a control unit 60. The control unit 60 includes an arithmetic unit 61, a storage unit 62, and a wireless module 63 (not shown) for transmitting and receiving with the gas minute leak detection device 100. The control unit 60 is configured similarly to the control unit 50 in the gas slight leakage detection device 100, and therefore, a detailed description thereof is omitted.
[ operation and Effect of gas minute leakage detection System ]
Next, the operation and operational effects of the gas minute leak detection system according to embodiment 2 will be described with reference to fig. 4 to 6.
Fig. 5A to 5C are flowcharts showing an example of the operation of the gas slight leakage detection device in the gas slight leakage detection system according to embodiment 2. Note that, the arithmetic unit 51 of the control unit 50 reads the program stored in the storage unit 52 every first period to execute the following operation.
As shown in fig. 5A to 5C, the control unit 50 acquires the flow rate of the gas from the gas flow rate acquisition unit 10 (step S201). Next, the control unit 50 determines whether or not the flow rate of the gas is zero in the first period based on the flow rate of the gas acquired in step S201 (step S202). Here, the term "gas flow rate" refers to not only a state in which no gas flows through the flow channel 3, but also a flow rate at which the flow rate value detected by the gas flow rate acquisition unit 10 is substantially zero.
When the control unit 50 determines that the flow rate of the gas is not zero in the first period (no in step S202), the flow counter value (the value of the flow counter) of the flow counter 52C is counted (the counter value is incremented by 1).
Next, the control unit 50 acquires a current flow counter value obtained by counting the current flow counter 52C (step S204), and determines whether or not the acquired current flow counter value reaches a preset fourth predetermined value (step S205). Here, the fourth predetermined value can be set as appropriate, and for example, when the first period is twenty-four hours (i.e., 1 day) and is determined for 30 days, the fourth predetermined value is set to 30.
When the control unit 50 determines that the available flow rate counter value acquired in step S204 has reached the fourth predetermined value (step S205: yes), the alarm unit 40 gives an alarm (step S206). In this case, the alarm unit 40 may be configured to alarm the occurrence of gas leakage based on the flow rate measurement. Thereby, the maintenance operator and/or the monitoring center can find an alarm of the gas leakage.
Next, the control unit 50 resets (initializes; sets 0 to the counter value of the flow counter 52C) (step S207), and ends the routine. In addition, the resetting of the flow counter value may also be performed by an instruction from a maintenance worker and/or a monitoring center.
On the other hand, when the control unit 50 determines that the flow counter value obtained in step S204 has not reached the fourth predetermined value (no in step S205), the non-pressure-rise counter value (the value of the non-pressure-rise counter) of the non-pressure-rise counter 52B is counted (the counter value is incremented by 1; step S213). When gas flows through the gas flow path 3, the pressure value cannot be detected, but the non-pressure-rise counter value of the non-pressure-rise counter 52B is counted from the viewpoint of redundancy. The processing after step S213 will be described later.
When the control unit 50 determines that the flow rate of the gas is zero in the first period based on the flow rate of the gas acquired in step S201 (yes in step S202), the current counter value of the current counter 52C is reset (step S208).
Next, the control unit 50 acquires the gas pressure detected by the pressure detection unit 20 (step S209). Next, the control unit 50 determines whether or not the increase value Δ P of the gas pressure during the first period is equal to or greater than a predetermined first pressure threshold value Δ P1 (for example, 20 pascals) based on the gas pressure acquired in step S209 (step S210).
When the control unit 50 determines that the gas pressure increase value Δ P is equal to or greater than the first pressure threshold value Δ P1 in the first period (yes in step S210), the control unit resets the no-pressure-increase counter value of the no-pressure-increase counter 52B (step S211), resets the temperature-increase counter value of the temperature-increase counter 52A (temperature counter value) (step S212), and ends the routine.
On the other hand, when the control unit 50 determines that the rise value Δ P of the gas pressure is not equal to or greater than the first pressure threshold value Δ P1 in the first period (no in step S210), the non-pressure-rise counter value of the non-pressure-rise counter 52B is counted (the counter value is incremented by 1; step S213).
Next, the control unit 50 acquires the gas temperature detected by the temperature detection unit 30 (step S214). Next, the control unit 50 determines whether or not the increase value Δ T of the gas temperature in the first period is equal to or greater than a predetermined first temperature threshold value Δ T1 (for example, 5 ℃) based on the gas temperature acquired in step S214 (step S215).
When the control unit 50 determines that the increase value Δ T of the gas temperature in the first period is equal to or greater than the predetermined first temperature threshold value Δ T1 (yes in step S215), the temperature increase counter value of the temperature increase counter 52A is counted (the counter value is incremented by 1; step S216), and the process of step S217 is executed. On the other hand, if the control unit 50 determines that the increase value Δ T of the gas temperature in the first period is not equal to or greater than the predetermined first temperature threshold value Δ T1 (step S215: no), the process of step S217 is executed.
In step S217, the control unit 50 acquires the no-pressure-rise counter value counted by the no-pressure-rise counter 52B. Next, the control unit 50 determines whether or not the non-pressure-rise counter value acquired in step S217 reaches a first predetermined value (step S218).
When the control unit 50 determines that the no-pressure-rise counter value has not reached the preset first predetermined value (step S218: no), the routine is terminated. On the other hand, when the control unit 50 determines that the no-pressure-rise counter value has reached the first predetermined value set in advance (step S218: YES), the process of step S219 is executed.
In step S219, the control section 50 outputs a first signal requesting permission of the alarm section 40 to issue an alarm to the monitoring center 110 via the wireless module 53.
Here, the operation of the monitoring center 110 after the first signal is input will be described with reference to fig. 6.
Fig. 6 is a flowchart showing an example of the operation of the monitoring center in the gas small leak detection system according to embodiment 2. The following operations are executed by the arithmetic unit 61 of the control unit 60 reading the program stored in the storage unit 62.
As shown in fig. 6, the control unit 60 of the monitoring center 110 determines whether or not the first signal is input from the control unit 50 of the gas minute leakage detection device 100 (step S301). When the control unit 60 determines that the first signal is not input from the control unit 50 (step S301: no), the process of step S301 is executed again after 50msec, for example.
On the other hand, when the control unit 60 determines that the first signal is input from the control unit 50 (step S301: YES), the temperature increase counter value obtained by counting the temperature increase counter 52A of the gas slight leakage detection device 100 is acquired via the wireless module 63 and the wireless module 53 (step S302).
Next, the control unit 60 determines whether or not the temperature increase counter value acquired in step S302 is equal to or greater than a second predetermined value (step S303). When the control unit 60 determines that the temperature increase counter value is equal to or greater than the second predetermined value (yes in step S303), it outputs a permission signal that is a signal for permitting the alarm unit 40 to generate an alarm (step S304), and the routine is terminated.
On the other hand, when the control unit 60 determines that the temperature-rise counter value is smaller than the second predetermined value (step S303: no), the flow counter value counted by the flow counter 52C is acquired (step S305). Next, the control unit 50 determines whether or not the current flow counter value acquired in step S305 is equal to or greater than a preset third predetermined value (step S306).
When the control unit 50 determines that the flow counter value is equal to or greater than the third predetermined value (yes in step S306), it outputs a permission signal (step S307) and ends the routine. On the other hand, when the control unit 50 determines that the flow rate counter value is not equal to or greater than the third predetermined value (no in step S306), it outputs a non-permission signal (step S308), and the routine is terminated.
Upon receiving the operation of the monitoring center 110, the control unit 50 of the gas slight leakage detection apparatus 100 executes the operation (processing) after step S220 as follows.
As shown in fig. 5C, after outputting the first signal to the monitoring center 110 (step S219), the control unit 50 determines whether or not a signal is input from the monitoring center 110 (step S220).
When the control unit 50 determines that no signal is input from the monitoring center 110 (step S220: no), the time is measured by a timer (step S221). Next, the control unit 50 determines whether or not the time elapsed since the first signal was output to the monitoring center 110 has elapsed the second period, based on the time information acquired in step S221 (step S222). Here, the second period is a predetermined period set in advance, and may be, for example, 5 minutes or 1 hour.
When the control unit 50 determines that the time elapsed since the first signal was output to the monitoring center 110 has not elapsed (step S222: no), the process returns to step S220, and the processes of steps S220 to S222 are executed in a state where no signal is input from the monitoring center 110 until the time elapsed since the first signal was output to the monitoring center 110 has elapsed for the second period.
On the other hand, when the control unit 50 determines that the time elapsed since the first signal was output to the monitoring center 110 has elapsed during the second period (yes in step S222), it causes the alarm unit 40 to perform an alarm (step S223), and the routine is terminated.
When the control unit 50 determines that a signal is input from the monitoring center 110 (step S220: yes), it determines whether the input signal is a permission signal or a non-permission signal (step S224). When the control unit 50 determines that the signal input from the monitoring center 110 is the permission signal, it causes the alarm unit 40 to output an alarm (step S225), and the routine is terminated.
On the other hand, when the control unit 50 determines that the signal input from the monitoring center 110 is the non-permission signal, it does not cause the alarm unit 40 to output an alarm (step S226). Next, the control unit 50 resets the no-pressure-rise counter value of the no-pressure-rise counter 52B (step S227), resets the temperature-rise counter value of the temperature-rise counter 52A (step S228), and ends the routine.
The gas slight-leakage detection system 300 according to embodiment 2 configured as described above can achieve the same operational advantages as the gas slight-leakage detection device 100 according to embodiment 1.
Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions. Accordingly, the foregoing description is to be construed as illustrative only and is for the purpose of providing those skilled in the art with a teaching that the best mode of carrying out the invention is provided. The details of the structure and/or function can be substantially changed without departing from the present invention. In addition, various inventions can be formed by appropriate combinations of a plurality of constituent elements disclosed in the above embodiments.
Industrial applicability
The gas minute leakage detection device and the gas minute leakage detection system according to the present invention can further consider the surrounding environment (particularly, temperature environment) of the gas supply path and can improve the accuracy of the leakage determination, and therefore the gas minute leakage detection device and the gas minute leakage detection system according to the present invention are useful.
Claims (8)
1. A gas minute leakage detection device is provided with:
a gas flow rate obtaining unit that obtains a flow rate of the gas in the gas flow path;
a pressure detection unit that detects a gas pressure in the gas flow path;
a temperature detection unit that detects a gas temperature in the gas flow path;
an alarm unit; and
a control part for controlling the operation of the display device,
wherein the control unit includes:
a flow rate counter that counts when the flow rate acquired by the gas flow rate acquisition unit is not zero in a predetermined first period, and resets when the flow rate is zero;
a non-pressure-rise counter that counts when a rise value of the gas pressure detected by the pressure detection unit does not become equal to or greater than a predetermined first pressure threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the rise value becomes equal to or greater than the first pressure threshold value; and
a temperature increase counter that counts when it is determined that an increase value of the gas temperature detected by the temperature detection unit is equal to or greater than a first temperature threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the increase value is equal to or greater than the first pressure threshold value,
the control unit is configured to: performing counting of the flow rate counter, the no-pressure-rise counter, and the temperature-rise counter during each of the first periods,
when the value of the no-pressure-rise counter reaches a first predetermined value, it is determined whether or not to cause the alarm unit to alarm, based on the value of the current-flow counter and the value of the temperature-rise counter.
2. The gas minute leak detection apparatus according to claim 1,
the control unit is configured to: and a temperature rise counter that is configured to be set to a second predetermined value or more, when the value of the no-pressure rise counter reaches the first predetermined value.
3. The gas minute leak detection apparatus according to claim 1 or 2,
the control unit is configured to: and a controller configured to control the alarm unit to alarm when the value of the no-pressure-rise counter reaches the first predetermined value, the temperature-rise counter is smaller than a second predetermined value, and the value of the flow rate counter is equal to or larger than a third predetermined value.
4. The gas minute leak detection apparatus according to any one of claims 1 to 3,
the control unit is configured to: and causing the alarm unit to alarm when the value of the current flow counter reaches a fourth predetermined value.
5. A gas minute leakage detection system is provided with:
a monitoring center; and
a gas minute leakage detection device having a gas flow rate acquisition unit for acquiring a flow rate of a gas in a gas flow path, a pressure detection unit for detecting a gas pressure in the gas flow path, a temperature detection unit for detecting a gas temperature in the gas flow path, an alarm unit, a wireless module for transmitting and receiving with the monitoring center, and a control unit,
wherein the control unit includes:
a flow rate counter that counts when the flow rate acquired by the gas flow rate acquisition unit is not zero in a predetermined first period, and resets when the flow rate is zero;
a non-pressure-rise counter that counts when a rise value of the gas pressure detected by the pressure detection unit does not become equal to or greater than a predetermined first pressure threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the rise value becomes equal to or greater than the first pressure threshold value; and
a temperature increase counter that counts when it is determined that an increase value of the gas temperature detected by the temperature detection unit is equal to or greater than a first temperature threshold value after the flow rate acquired by the gas flow rate acquisition unit becomes zero in the first period, and resets when the increase value is equal to or greater than the first pressure threshold value,
the control unit is configured to: performing counting of the flow rate counter, the no-pressure-rise counter, and the temperature-rise counter during each of the first periods,
and outputting a first signal from the wireless module to the monitoring center when the value of the no-pressure-rise counter reaches a first predetermined value, the first signal requesting permission of the alarm unit to issue a warning,
the monitoring center is configured to: when the first signal is input from the control unit, it is determined whether or not to cause the alarm unit to alarm, based on the value of the current-rate counter and the value of the temperature-rise counter.
6. The gas microleakage detection system of claim 5,
the monitoring center is configured to: acquiring a value of the temperature increase counter when the first signal is input from the control unit, and outputting an enable signal to the control unit when the acquired value of the temperature increase counter is equal to or greater than a second predetermined value, the enable signal being a signal for enabling the alarm unit to display an alarm,
the control unit is configured to: when the permission signal is input from the monitoring center, the alarm unit is caused to alarm.
7. The gas microleakage detection system of claim 5 or 6,
the monitoring center is configured to: a control unit configured to acquire a value of the temperature increase counter and a value of the flow rate counter when the first signal is input from the control unit, and output an enable signal to the control unit when the acquired value of the temperature increase counter is smaller than a second predetermined value and the value of the flow rate counter is equal to or larger than a third predetermined value, the enable signal being a signal for enabling the alarm unit to display an alarm,
the control unit is configured to: when the permission signal is input from the monitoring center, the alarm unit is caused to alarm.
8. The gas microleakage detection system of any one of claims 5 to 7,
the control unit is configured to: and causing the alarm unit to alarm when the value of the current flow counter reaches a fourth predetermined value.
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| JP2019109726A JP7266242B2 (en) | 2019-06-12 | 2019-06-12 | Gas minute leak detector and gas minute leak detection system |
| JP2019-109726 | 2019-06-12 |
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| JP7266242B2 (en) | 2023-04-28 |
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