JP2927773B2 - Gas leak detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas leak detecting device for detecting a minute leak of a supply pipe including a buried pipe in a liquefied petroleum gas supply facility, and more particularly, to a gas supply facility having a plurality of consumers, which is normal or abnormal. The present invention relates to a gas leak detection device for diagnosing the above.

[0002]

2. Description of the Related Art Conventionally, as this type of apparatus, for example, an apparatus as shown in FIG. 8 disclosed in Japanese Patent Application Laid-Open No. 3-41300 has been proposed. Fig. 8 shows a multi-family house, such as a condominium, incorporating a switchable gas leak detection device (demand destination).
Shows a gas supply facility for supplying gas to
Gas supply source 1 such as propane gas cylinder and apartment 2
The gas inlet 3 is connected to a gas supply pipe 4, and the gas supply pipe 4 is provided with an original pressure regulator 5, a parent pressure regulator 6, and a parent gas meter (parent flow measuring means) 7. The gas inlet 3 is provided with, for example, valves 8 and 9 for each floor, and each house in the apartment 2 is provided with a pipe 1 via a valve 10 and a gas meter 11, respectively.
2 supplies gas to the gas consuming equipment 13.

The original pressure regulator 5 on the gas supply source 1 side and the parent gas meter 7 for integrating the amount of gas supplied to the entire apartment 2
The above-described parent pressure regulator 6 is provided in the gas supply pipe 4 between the gas supply pipe 4 and the bypass gas flow path 14 connecting the inlet side and the exit side of the parent pressure regulator 6 to the gas supply pipe 4. Is provided. The bypass gas flow path 14 is provided with a child pressure regulator 15 and a microcomputer gas meter (hereinafter referred to as an M meter) (by-pass flow rate measuring means) 16 as a minute leak detecting means in this order from the inlet side.

The adjustment pressure of the child pressure regulator 15 is set higher than the adjustment pressure of the parent pressure regulator 6. For example, when the adjustment pressure of the parent pressure regulator 6 is set to 280 mmH2 O, the adjustment pressure of the child pressure regulator 15 is about 300
Set to mmH2O. The M meter 16 can accurately accumulate a very small flow rate, for example, a flow rate of about 3 liters / hour, and monitors the flow rate by a minute leak detection function. Is determined to have occurred, and the fact is displayed by lighting the lamp.

[0005] In the above configuration, when gas consumption at night or late at night is almost eliminated, the pressure of the gas supply pipe 4 becomes high, so that the master pressure regulator 6 having a low regulation pressure is first closed. For this reason, the gas with a small flow rate is supplied to the sub-pressure regulator 15.
Since the gas flows only to the M meter 16, it is possible to monitor the minute gas flow rate flowing to the apartment 2 through the gas supply path 4 by the M meter 16. At this time, if there is no gas consumption and no minute leakage of gas occurs, both the parent gas meter 7 and the M meter 16 do not detect the gas flow rate.

[0006] It is assumed that the entire condominium 2 has no gas consumption at least once during a relatively long predetermined period of, for example, 30 days. If the gas meter 7 and the M meter 16 do not stop detecting the gas flow rate, it can be determined that a minute gas leak has occurred.

As described above, the bypass gas flow path 14 is provided in a part of the gas supply pipe 4, and the pressure regulators 6 having different adjustment pressures are provided.
15 allows the gas to flow through the bypass gas flow path 14 when the flow rate is low, and the flow rate is monitored by the M meter 16 provided in the bypass gas flow path 14 which can detect the fine flow rate, so that the leak of the minute gas is detected. Gas leak detection of the gas supply pipe 4 can be easily and reliably performed without stopping gas supply.

[0008]

In the above-described conventional gas leak detecting device, the master pressure regulator 6 and the slave pressure regulator 15 are used.
Can detect a minute leak of gas on the premise that the function is functioning normally. Even if any of these functions is impaired, accurate detection cannot be performed.

The parent pressure regulator 6 and the child pressure regulator 1
Regarding 5, the function can be confirmed once a year, but the inspection frequency of the above equipment, which is assumed to be constantly monitored, is too long, and the equipment cannot function in the event of equipment deterioration or sudden accident. May be left unnoticed.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and has been made so as to constantly monitor whether or not the constituent pressure regulators and the child pressure regulators are functioning normally. It is an object of the present invention to provide a gas leak detection device capable of improving reliability.

[0011]

In order to achieve the above object, a gas leak detecting device according to claim 1 is a gas supply pipe (4) for supplying gas from a gas supply source (1) to a demand destination.
A master pressure regulator (6) provided in the gas supply pipe (4) for adjusting the pressure of the gas supply source (1) to a predetermined pressure; and bypassing the master pressure regulator (6). A bypass gas passage (14) connected to the gas supply pipe (4), and a child pressure adjustment provided in the bypass gas passage (14) and having a higher adjustment pressure than the master pressure regulator (6). (15) and a bypass flow rate measurement device provided in a bypass gas flow path (14) downstream of the slave pressure regulator (15) and capable of measuring a minute flow rate of gas flowing through the bypass gas flow path (14). Means (16), wherein the bypass flow rate measuring means (16) detects a continuous flow for a predetermined period of time to detect minute gas leakage. Downstream from the regulator (15) The bypass gas flow passage (14), the pressure and the bypass gas flow path from the downstream bypass gas flow path (14) in this child pressure regulator (15) (1
Pressure sensing means (17) for sensing the pressure in the gas supply pipe (4) downstream of the parent pressure regulator (6) via the pressure sensing means (4), and a bypass gas upstream of the pressure sensing means (17). The flow path (14) is provided with a shut-off valve (22) for opening and closing the bypass gas flow path (14), and the pressure detected by the pressure detection means (17) causes the master pressure regulator (6) to open. And adjusting pressures of the child pressure regulator (15) and determining whether the parent pressure regulator (6) and the child pressure regulator (15) are normal or abnormal based on the adjusted pressures. .

According to a second aspect of the present invention, in the gas leak detecting apparatus according to the first aspect, the adjustment pressure of the child pressure regulator (15) is set to a predetermined value from the adjustment pressure of the parent pressure regulator (6). By checking that the pressure is higher than the normal pressure, the normal pressure of the parent pressure regulator (6) and the child pressure regulator (15)
It is characterized in that it is configured to diagnose an abnormality.

[0013] The first aspect of the present invention is configured as described above.
In the gas leak detection device described in (1), for example, it is assumed that a large amount of gas is consumed at a demand destination. In this state, the parent pressure regulator supplies a large amount of gas from the gas supply source to the gas supply pipe in order to set the pressure in the gas supply pipe to the pressure set by the parent pressure regulator. On the other hand, when the shut-off valve is open, the gas in the gas supply source is also passed through the bypass gas flow path so that the pressure in the gas supply pipe becomes the pressure set by the gas pressure regulator when the shut-off valve is in the open state. A large amount will be supplied to the gas supply pipe. However, the gas supply capacity of the child pressure regulator cannot cover all of the large amount of gas consumed at the demand destination because of its small size. Therefore, when a large amount of gas is consumed, the pressure of the gas in the gas supply pipe becomes the adjusted pressure of the master pressure regulator.
Therefore, when a large amount of gas is consumed, the pressure detection means detects the pressure in the gas supply pipe regardless of the opening and closing of the shut-off valve, that is, regardless of the opening and closing of the bypass gas flow path. The adjustment pressure of the pressure regulator can be confirmed.

Next, in a state where the shut-off valve is opened, the gas consumption at the demand destination gradually decreases, and the gas supplied from the child pressure regulator to the gas supply pipe via the bypass gas flow path is reduced. When the consumption of the gas at the demand destination can be covered only by the flow rate, the inside of the gas supply pipe is filled with the relatively high-pressure gas supplied from the child pressure regulator. That is, the pressure in the gas supply pipe becomes higher than the pressure adjusted by the master pressure regulator. For this reason, the parent pressure regulator does not need to supply gas into the gas supply pipe to increase the pressure in the gas supply pipe, so that the master pressure regulator is completely closed. Therefore, when the gas consumption is small, the pressure of the gas in the gas supply pipe becomes the adjustment pressure of the child pressure regulator by keeping the shut-off valve open. For this reason, if the shut-off valve is opened when the gas consumption is low, it is possible to confirm the adjustment pressure of the small pressure regulator by detecting the pressure in the gas supply pipe by the pressure detection means. it can.

Further, as described above, if the shut-off valve is closed when the gas consumption is small, gas is not supplied from the child pressure regulator to the gas supply pipe via the bypass gas flow path. Then, the gas is supplied from the master pressure regulator to the gas supply pipe. Therefore, when the gas consumption is small, the pressure of the gas in the gas supply pipe becomes the adjustment pressure of the master pressure regulator by closing the shutoff valve. For this reason, if the shut-off valve is closed when the gas consumption is low, it is possible to confirm the adjustment pressure of the master pressure regulator by detecting the pressure in the gas supply pipe by the pressure detection means. it can.

Further, when the shut-off valve is opened,
When the gas is not consumed at all, there is no need to supply the gas to the demand side, so the child pressure regulator is also closed. Therefore, by detecting the pressure in the gas supply pipe by the pressure detecting means at this time, the closing pressure of the small pressure regulator and the master pressure regulator can be confirmed.

As described above, it is possible to diagnose the normality / abnormality of the master pressure regulator and the slave pressure regulator by always checking the adjustment pressure and the closing pressure in the master pressure regulator and the slave pressure regulator. Therefore, the reliability of the gas leak detection function can be improved.

In addition, there is an advantage that the adjusted pressures of the master pressure regulator and the slave pressure regulator can be confirmed by one pressure detecting means.

Furthermore, when the gas consumption is small, the adjustment pressure of the master pressure regulator is measured almost simultaneously with the measurement of the adjustment pressure of the child pressure regulator by merely closing the shutoff valve. There is an advantage that can be.

According to the gas leak detecting device of the second aspect, if the adjustment pressure of the child pressure regulator is higher than the adjustment pressure of the parent pressure regulator by a predetermined value or more, the parent pressure regulator and the child pressure regulator are normal. It can be diagnosed that there is.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a gas leak detecting device according to an embodiment of the present invention.

FIGS. 1 and 2 show the structure of a reference example of the present invention. In these figures, parts corresponding to those of the conventional example shown in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted as appropriate. The feature of this embodiment is that an M meter (bypass flow rate measuring means) 16 is provided with a pressure sensor (pressure detecting means) 17 and a flow rate checker (stepwise flow rate detecting means) is provided on the bypass gas flow path 14 downstream of the child pressure regulator 15. ) 18 is provided.

As shown in FIG. 2, the flow rate checker 18 has a structure in which a closed cylindrical float 18d is accommodated in a cylindrical body 18c provided with a fluid inlet 18a below and a fluid outlet 18b above. Proximity magnetic switches 18e and 18f are provided at the upper and lower ends of the cylinder 18c, respectively. When the float 18d is at the upper or lower end of the cylinder 18c, the proximity magnetic switches 18e and 18f are respectively provided.
e and 18f are turned on. In addition, cylinder 1
A bypass flow path 18g is provided between the inner periphery of the center in the height direction of 8c and the fluid outlet 18b, and the position of the float 18d is adjusted by changing the opening degree of this flow path in the bypass flow path 18g. Float adjusting valve 18h is provided.

Next, the operation of the flow rate checker 18 will be described with reference to FIG. When the gas flow rate flowing through the bypass gas flow path 14 is less than 3 liters / hour, the float 18d is located at the lower end of the cylindrical body 18c as shown in FIG.
8f turns ON. When the gas flow rate exceeds 100 liters / hour, the float 1 as shown in FIG.
8d is at the upper end of the cylinder 18c, and the switch 18e is ON
Becomes Further, when the gas flow rate is more than 3 liters / hour and less than 100 liters / hour, the float 18d is located in the middle of the height direction of the cylindrical body 18c as shown in (b), and both the switches 18e and 18f are turned off. .

Next, the abnormality diagnosis items will be described with reference to FIG. As shown in FIG. 4, a region where the flow rate Q of the bypass gas flow path 14 is less than 3 liters / hour is a region I, a region where the flow rate Q is 3 liters / hour to 100 liters / hour is a region II, and the flow rate Q is The area exceeding 100 liters / hour is defined as area III. Flow checker 18
Is detected when the area I is detected (the flow rate by the M meter 16 is less than 3 liters / hour) and the flow rate at which the leak detection unit diagnoses that there is no flow rate (the flow rate by the M meter 16 is less than 21 liters / hour) The pressure detected by the pressure sensor 17 provided on the M meter 16 is the closing pressure P of the gas supply pipe 4.
When the closing pressure P1 is less than 350 mmH2 O, the master pressure regulator 6 and the slave pressure regulator 15 are diagnosed as normal.

[0026]

[Table 1] When the flow rate checker 18 detects the region III, the pressure detected by the pressure sensor 17 becomes the outlet pressure P4 of the master pressure regulator 6 in the gas supply pipe 14, and if the outlet pressure P4 is 255 mmH2 O to 305 mmH2 O, The parent pressure regulator 6 is diagnosed as normal.

When the flow rate checker 18 detects the region II, if the outlet pressure P3 of the child pressure regulator 15 detected by the pressure sensor 17 is 310 mmH2O to 330 mmH2O, it is determined that the child pressure regulator 15 is normal. Diagnosed.

Further, if the outlet pressure P4 of the parent pressure regulator 6 and the outlet pressure P3 of the child pressure regulator 15 fall within the above ranges, respectively, the differential pressure P between the parent and child pressure regulators 6, 15 is obtained.
2 is diagnosed as being properly secured.

When the flow rate checker 18 detects the area I and the number of times the M meter 16 detects the flow rate exceeding 2.8 liters / hour is 10 times or more in 30 days, the M meter 16 Is diagnosed as abnormal.

The two curves shown by solid lines in FIG. 4 show the relationship between the flow rate Q and the output pressure when both the master pressure regulator 6 and the slave pressure regulator 15 are used. The value and the lower limit are shown. The broken line is a similar curve when only the parent pressure regulator 6 is used, and the range surrounded by the rectangular frames A and B is determined to be normal for the child pressure regulator 15 and the parent pressure regulator 6, respectively. Range.

The details of the operation outlined above will be described in detail with reference to the flowchart shown in FIG.

In FIG. 5, at step S101, the flow rate is measured by the M meter 16, and at the same time, at step S201, the flow rate area is determined by the flow rate checker 18. In step S102, the M meter 1
6 determines whether or not the measured flow rate is less than 21 liters / hour. At the same time, in step S202, it is determined whether or not the flow rate area determined by the flow rate checker 18 is the area I. If the flow rate measured by the M meter 16 is less than 21 liters / hour and the flow rate area determined by the flow rate checker 18 is the area I, a 4-minute timer is started in step S103.

If four minutes have elapsed in step S104, the closing pressure P1 at that time is measured by the pressure sensor 17 in step S105. If four minutes have not elapsed, it is determined in step S106 whether or not a flow signal has been input by the M meter 16, and if no flow signal has been input, the flow returns to step S104. If there is an input of the flow signal, the 4-minute timer is cleared and the process returns to the start in step S107.

In step S105, the closing pressure P1
Is measured, a 15-minute timer is started in step S108. Next, in step S109,
It is determined whether or not the flow rate measured by the M meter 16 is less than 2.8 liter / hour, and if it is not more than 2.8 liter / hour, it is determined in step S110 whether or not 15 minutes have elapsed. If it is 2.8 liters / hour or more, in step S111, it is determined whether or not the number of times of 2.8 liters / hour or more was 10 or more in 30 days. It diagnoses that the M meter 16 is abnormal, and notifies the abnormality by LCD display or notification. If less than 10 times, return to start. That is, the M meter 1 as a flow rate detection diagnostic means
6 is provided with a function for automatically confirming normality / abnormality.
In step S110, if 15 minutes have not elapsed, the process returns to step S109.
Move to 3. During this 15 minutes and the total of 4 minutes in step S104, 19 minutes, the pressure fluctuation error due to the influence of the change in the ambient temperature is absorbed.

In step 113, it is determined whether or not the flow rate measured by the M meter 16 is not more than 21 liters / hour for 19 minutes. If not, in step S114, the pressure P1 detected by the pressure sensor 17 is 350 mm.
It is determined whether it is H2O or more. If it is equal to or greater than 350 mmH2O, it is determined in step S115 that the blocking pressure P1 is abnormal, and in step S116, it is determined whether a blocking pressure abnormal condition is satisfied. If the closing pressure abnormality condition is satisfied, a closing pressure abnormality is displayed in step S117. If the closing pressure abnormality condition is not satisfied, in step S118, the pressure sensor 17 determines in step S1
After a lapse of 19 minutes from 03, the closing pressure P2 is measured, and in step S119, it is determined whether (P2 -P1) exceeds 30 mmH2O. If it is not less than 30 mmH2O, it is determined in step S120 whether or not a leak condition is satisfied. If it is, an error in leak confirmation is displayed in step S121. In step S119,
If (P2-P1) is 30 mmH2O or less, step S1.
At 22, display no leak and monitor this condition for 30 days. Although 19 minutes have not elapsed in step S113, if the closing pressure P1 is equal to or less than 350 mmH2O in step S114, the process proceeds to step S11.
Move to 8. If the leak condition is not satisfied in step S120, the process returns to step S108.

On the other hand, when the flow rate measured by the M meter 16 is equal to or more than 21 liters / hour in step S102, it is determined whether or not the area detected by the flow rate checker 18 in step S203 is area II. If it is the area II, the flow rate classification is determined in step S204, and in step S205, it is checked whether or not the individual maximum flow rate at that time is registered in the control unit of the system. If registered, in step S206, the output pressure P3 of the slave pressure regulator 15 is measured by the pressure sensor 17. If not registered, return to start. Next, in step S207, is the output pressure P3 larger than the registered maximum value?
Alternatively, it is determined whether the value is smaller than the minimum value. If the value is larger than the maximum value or smaller than the minimum value, the maximum and minimum values of the adjustment pressure of the child pressure regulator 15 are updated and registered in step S208.

Next, in step S209, it is determined whether or not the output pressure P3 is not less than 310 mmH2O and not more than 330 mmH2O. If so, it is determined to be normal and the process returns to the start. Otherwise, in step S210, 1 is added to the count value of the upper or lower adjustment pressure abnormality counter, and in step S211, it is determined whether an adjustment pressure abnormality condition is satisfied. In step S212, the slave pressure regulator is determined. It indicates that the upper limit or the lower limit of the 15 adjustment pressure is abnormal. If P3 is between the maximum value and the minimum value in step S207, step S208 is omitted and the process moves to step S209. If the abnormal condition of the adjustment pressure is not satisfied in step S211, it is determined that the child pressure regulator 15 is normal, the fact is displayed, and the process returns to the start.

In step S201, the flow rate checker 1
If the flow area determined by 8 is the area III, the area II
Steps S303 to S312 as in the case of
The operation is performed. However, in this case, the normal pressure range of the output pressure P4 of the master pressure regulator 6 in step S309 is 25.
5 mmH2O to 305 mmH2O.

According to the present embodiment, a simple configuration in which the M meter 16 is provided with the pressure sensor 17 and the bypass gas flow path 14 is provided with the flow rate checker 18 makes it possible to automatically confirm the suitability of the gas leak detection function. It is possible to improve the maintenance management ability of the abnormality diagnosis system. Also, the appropriateness of the adjustment pressure and the closing pressure of the gas supply equipment can be automatically checked, and the cycle of security inspection work can be shortened.

The range of the flow rate range and the normal pressure range described in the above reference example are merely examples, and the present invention is not limited thereto.

Next, in one embodiment of the present invention, it is confirmed whether or not the differential pressure between the adjustment pressure of the master pressure regulator 6 and the adjustment pressure of the child pressure regulator 15 in the above reference example is normally maintained. M meter 1 with pressure checking means
6 will be described with reference to FIG. Gas input port 16a of M meter 16 connected to bypass gas flow path 14
A shutoff valve 22, a flow rate measuring unit 23 and a pressure sensor 1
7 are provided. The M meter 16 has a counter 24 for displaying an integrated value of the flow rate measured by the flow rate measuring unit 23,
Control unit 25, display function 26, power supply 27, and push button 28
Is built-in.

The control unit 25 has an arithmetic function 29 and a clock function 3
0, a microcomputer 31 and a shutoff valve driving function (valve driving means) 32 as judgment functions are provided.
7 driven.

The operation of the M meter 16 provided with the means for confirming the pressure difference between the master pressure regulator 6 and the slave pressure regulator 15 configured as described above will be described with reference to the flowchart shown in FIG. . In step S401, when a new gas cylinder is delivered and attached, the push button 28 is pressed and the arithmetic function 29 is pressed.
Is turned on, and in step S402, the flow rate of the gas flowing through the bypass gas flow path 14 is confirmed by the flow rate measuring unit 23. In step S403, it is determined whether or not the gas flow rate is within a predetermined range. If the gas flow rate is within the predetermined range, the adjustment pressure P11 of the child pressure regulator 15 is confirmed by the pressure sensor 17 in step S404.

If it is determined in step S403 that the flow rate is not within the predetermined range, the flow returns to step S402 after waiting for a predetermined time by the clock function 30 in step S405, and the gas flow rate is repeatedly checked. If the adjustment pressure P11 of the slave pressure regulator 15 is confirmed in step S404, the adjustment pressure P11 is determined in step S406.
The numerical value of 11 is stored in the microcomputer 31.

Next, in step S407, the shutoff valve 22 is closed by the valve driving function 32, and the predetermined flow rate range is generally 50 liter / hour to 100 liter / hour. If it is within the predetermined flow rate range, the adjustment pressure P12 of the master pressure regulator 6 at this time is confirmed in step S408, and the value of the adjustment pressure P12 is stored in the microcomputer 31 provided in the M meter 16 in step S409. Next, in step S410, the shut-off valve 22 is opened by the valve driving function 32 to allow gas to pass.

Next, in step S411, the adjustment pressure P11 of the child pressure regulator 15 and the adjustment pressure P
12 and in step S412, the arithmetic function 2
9, the value of (P11-P12) is calculated, and the microcomputer 31 determines whether the value of (P11-P12) is equal to or greater than a predetermined value. If it is equal to or more than the predetermined value, it is determined that the parent pressure regulator 6 and the child pressure regulator 15 are normal. If it is not more than the predetermined value, in step S413, the lamp 26a provided in the display function 26 is turned on to display an abnormality.

According to this embodiment, it is automatically checked whether or not the adjustment pressure of the slave pressure regulator 15 is always higher than the adjustment pressure of the master pressure regulator 6 by a predetermined value or more. The result can be displayed on a lamp or transmitted to a predetermined position.

As described above, according to the gas leak detection device of the present embodiment, the suitability of the gas leak detection function and the suitability of the adjustment pressure and the closing pressure of the gas supply equipment are automated, so that the maintenance The capacity can be improved, and the cycle of maintenance and inspection work can be shortened.

The operations in steps S401 to S413 may be repeated. Alternatively, the above operation may be repeatedly performed at a fixed time, for example, every two hours by using the clock function 30. In this case, after the airtight check counter function provided in the M meter 16 is turned off, the operations of steps S402 to S412 are repeated.
When the above operation is repeated for several days (P11-P12)
If the value is continuously equal to or less than the predetermined value, the lamp 26a may be turned on to display an abnormality. Further, when it is determined in step S413 that the pressure regulators 6 and 15 are normal, the function of the airtight check counter provided in the M meter is returned to ON.

[0050]

According to the first aspect of the present invention, when a large amount of gas is consumed, the adjustment pressure of the master pressure regulator can be confirmed by the pressure detection means regardless of whether the shutoff valve is opened or closed. When the gas is consumed at a small flow rate, the shut-off valve is kept open so that the same pressure detecting means as described above can be used to check the adjustment pressure of the child pressure regulator. In addition, when a small amount of gas is consumed, by closing the shut-off valve, the adjusted pressure of the master pressure regulator can be confirmed by the same pressure detecting means as described above. Furthermore, when there is no gas consumption, the closing pressure of the master pressure regulator and the slave pressure regulator can be confirmed by the same pressure detecting means as described above.

Therefore, whether the master pressure regulator and the slave pressure regulator are functioning normally can be monitored at all times, and the reliability of the gas leak detection function can be improved.
In addition, there is an advantage that the adjustment pressure of the master pressure regulator and the slave pressure regulator can be confirmed by one pressure detection unit. Furthermore, at the time of gas consumption at a small flow rate, there is an advantage that the adjustment pressure of the master pressure regulator can be measured almost simultaneously with the measurement of the adjustment pressure of the child pressure regulator simply by closing the shutoff valve. .

According to the second aspect of the present invention, in addition to the effects of the first aspect, if the adjustment pressure of the child pressure regulator is higher than the adjustment pressure of the parent pressure regulator by a predetermined value or more,
It can be diagnosed that the parent pressure regulator and the child pressure regulator are normal.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a gas leak detection device shown as a reference example of the present invention.

FIG. 2 is a longitudinal sectional view showing a flow rate checker in the gas leakage detection device.

FIG. 3 is an explanatory diagram showing an operation of a flow rate checker in the gas leak detection device.

FIG. 4 is a diagram showing a relationship between a flow rate of a pressure regulator and an output pressure in the gas leakage detection device.

FIG. 5 is a flowchart showing the operation of the gas leakage detection device.

FIG. 6 is an explanatory diagram of a gas leak detection device shown as one embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the gas leakage detection device.

FIG. 8 is an explanatory diagram showing a configuration of an example of a conventional gas leak detection device.

[Explanation of symbols]

 Reference Signs List 4 gas supply pipe 6 parent pressure regulator 14 bypass gas flow path 15 child pressure regulator 16 bypass flow rate measuring means (M meter) 17 pressure detecting means (pressure sensor) 22 shutoff valve 32 valve driving means (valve driving function)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) G01M 3/00-3/28 F17C 13/02 301 F17D 5/02

Claims (2)

(57) [Claims] 1. A gas supply pipe (4) for supplying a gas from a gas supply source (1) to a demand destination, and a gas supply pipe (4) provided in the gas supply pipe (4), for controlling a pressure of the gas supply source (1) to a predetermined value. A parent pressure regulator (6) for adjusting pressure, and a bypass gas flow path (1) connected to the gas supply pipe (4) so as to bypass the parent pressure regulator (6).
4) and a child pressure regulator (15) provided in the bypass gas flow path (14) and having a higher regulation pressure than the master pressure regulator (6).
And a bypass gas passage (14) provided downstream of the slave pressure regulator (15).
And a bypass flow rate measuring means (16) capable of measuring a minute flow rate of gas flowing through the apparatus, wherein the bypass flow rate measuring means (16) detects that there is a flow rate continuously for a predetermined period to detect a minute gas leak. In the gas leak detection device, the bypass gas flow path (14) downstream of the child pressure regulator (15) is provided in the bypass gas flow path (14) downstream of the child pressure regulator (15). ) And pressure detection means (17) for detecting the pressure in the gas supply pipe (4) downstream of the master pressure regulator (6) via the bypass gas flow path (14). The bypass gas flow path (14) upstream of the detection means (17) is provided with a shutoff valve (22) for opening and closing the bypass gas flow path (14), and the pressure is detected by the pressure detection means (17). By pressure, The parent pressure regulator (6) and the child pressure regulator (15)
A gas leak detection device characterized by determining the adjusted pressures and diagnosing normal / abnormal of the parent pressure regulator (6) and the child pressure regulator (15) based on the adjusted pressures. 2. Confirming that the adjustment pressure of the child pressure regulator (15) is higher than the adjustment pressure of the parent pressure regulator (6) by a predetermined value or more, so that the parent pressure regulator (6) and the child pressure 2. The gas leak detection device according to claim 1, wherein the device is configured to diagnose whether the regulator is normal or abnormal.