JPH08121763A - Gas circuit breaker - Google Patents

Abstract

PURPOSE: To acquire the health of a gas passage in an early stage by learning a pattern of a user in using gas, making use of a time zone, during which gas is not used, to once shut off the gas passage and automatically inspect at regular intervals whether gas pressure decreases or not. CONSTITUTION: When a gas pressure in a gas passage decreases below a predetermined value and a pressure decreasing signal B is outputted from a pressure detecting unit 2, a pressure judging unit 3 is caused to output a pressure judgment going signal D, and to output a shut-off alarming signal C upon receipt of a flow rate signal A from a flow rate measuring unit 1. A shut-off informing unit 4 is permitted to inform an alarm on the basis of the shut-off alarming signal C, and the gas passage is shut off. Further, detection of gas leakage is effected by detecting a time zone, during which gas is not used and any flow rate signal is not existent, in a predetermined period of time, holding the result, permitting a flow rate nonexistence learning unit 5 to output a pressure inspection demanding signal E after learning to shut off the gas passage, and causing a pressure inspecting unit 6 to inspect whether gas pressure decreases or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas shutoff device for ensuring safety in using a gas after a gas meter.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, this type of gas shutoff device monitors a flow rate measuring unit 11 which outputs a flow rate signal X corresponding to the amount of passing gas and a flow rate signal X, and a specific period (3
If the flow rate signal X constantly appears for 0 days), the flow rate signal monitoring section 12 outputs the inner tube leak signal Y, and a warning is issued based on the inner tube leak signal Y of the flow rate signal monitoring section 12 to shut off the gas passage. It includes a shutoff notification unit 13.

[0003]

However, such a gas shutoff device requires a long monitoring period to confirm that the flow signal is continuously generated for 30 days.
Even if a gas leak had occurred, it was not possible to immediately obtain an abnormal condition.

That is, in the conventional gas shutoff device, there is a long dead period of 30 days at the worst even though the gas is leaking, so that the gas leak causes an unsafe state for an extremely long time. was there.

Therefore, in the gas shut-off device of the present invention, the period during which the gas is not used is learned, and the gas passage is opened / closed during the unused period of the learned gas to determine whether the pressure in the enclosed gas passage decreases. Automatically and for a short period (several hours)
The purpose is to detect gas leakage by detecting with.

[0006]

In order to achieve the above object, the means of the present invention comprises a flow rate measuring section for outputting a flow rate signal corresponding to the amount of passing gas and a gas passage downstream from the apparatus. Monitors the flow rate signal with the shutoff unit, detects and holds the no flow rate time zone during which no flow rate signal exists during the specific survey period, and then outputs the pressure inspection request signal when the flow rate no time zone is reached. The learning unit and the gas passage which is instructed to shut off the gas passage to the shutoff unit when the flowrate signal is not received and when the flowrate signal is not received, and the shutoff gas passage is detected within a predetermined time by the pressure detection unit that detects pressure fluctuation. And a pressure inspecting section for instructing to detect whether or not the pressure drops by a predetermined value or more.

[0007]

With the above means, the means of the present invention learns the gas usage pattern of the gas user and uses the time period when the gas is not used, so that the gas user cannot use the gas. Without any inconvenience to say, the gas passage is once shut off and the presence or absence of a decrease in gas pressure is automatically inspected for a certain period (several hours), and automatically before the gas user starts using the gas again. It is possible to open the gas passage.

In this way, the gas leak inspection can be carried out automatically and in a short time, so that the soundness of the gas passage can be acquired at an early stage, and the abnormality is notified to improve the safety. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the gas shutoff device of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention,
A flow rate measurement unit 1 that outputs a flow rate signal A corresponding to the amount of passing gas, a pressure detection unit 2 that outputs a pressure drop signal B when the pressure sensor detects that the gas pressure in the gas passage has dropped below a certain value, the pressure The pressure determination unit 3 that outputs the pressure determination in-progress signal D while the pressure drop signal B of the detection unit 2 is output, and outputs the cutoff warning signal C when the flow rate signal A of the flow rate measurement unit 1 is received. Cutoff warning signal C of part 3
Based on the above, the flow rate signal A of the flow rate measuring unit 1 and the shutoff reporting unit 4 for alerting the publicly available communication line such as a telephone line to the externally provided monitoring center to shut off the gas passage are monitored, and During the period (for example, one month), the unused time period of the gas for which there is no flow rate signal is detected in 1-minute units, and the result is retained. Once the longest flow period does not exist after learning, once a week There is no flow rate signal A from the flow rate no-learning section 5 and the flow rate measuring section 1 that outputs the pressure test request signal E at a ratio of 1, and there is a pressure test request signal E from the no flow rate learning section 5. When there is no signal D during pressure determination, a gas passage opening / closing signal F for temporarily shutting off the gas passage of the shutoff notification unit 4 and opening the gas passage after a certain period (immediately before the end of the time period when there is no flow rate) is output. It is composed of a pressure inspection unit 6.

The program flow of the above means is shown in FIG.
To T19. Now, it is assumed that the flow from the start of processing to the end of processing is periodically processed by an interval calendar or the like. In the pressure detection unit 2, the process T1 (the number in the upper left of each block) determines whether or not there is pressure. If there is pressure, the process moves to process T2, and if there is no pressure, the pressure determination flag is cleared and the process moves to process T3. In the pressure determination unit 3, the process T2 sets a pressure determination flag and shifts to the process T3. In the flow rate measuring unit 1, the process T3 determines whether or not there is a flow rate, and if there is a flow rate, the process proceeds to the process T4, and if there is no flow rate, the process proceeds to the process T9.

In the pressure determination unit 3, the process T4 determines whether or not the pressure is being determined. If the pressure determination flag is set, the process proceeds to process T8, and if the pressure determination flag is not set, the process proceeds to process T5. Processing T5 in the learning unit 5 without flow rate
Determines whether the learning period (for example, one month) has ended. If the learning period has ended, the process shifts to T7, and if not, the process shifts to T6. In process T6, the time zone in which the flow rate appears is recorded and the process ends. Pressure inspection unit 6
In process T7, the pressure inspection timer is counted up and the process is terminated. In the shutoff notification unit 4, a process T8 issues a warning, shuts off the gas passage, and ends the process.

In the flow rate-less learning unit 5, the process T9 determines whether the learning period has ended. If the learning period has ended, the process proceeds to process T10, and if not, the process ends. In the pressure inspection unit 6, the process T10 counts up the pressure inspection timer and shifts to the process T11. Process T11
Determines whether the pressure check timer has passed a predetermined time (for example, one month has passed and the flow rate is in a non-existent time zone). If the time has passed, the process proceeds to process T12, and if not, the process proceeds. To finish.

In the process T12, it is determined whether or not the flag during the pressure inspection period is set. If the flag during the inspection period is set, the process proceeds to process T15. If the flag during the inspection period is not set, the process proceeds to process T13. In the process T13, it is determined whether or not the pressure determination flag is set. If the pressure determination flag is set, the process ends. If the pressure determination flag is not set, a flag is set during the inspection period and the process proceeds to process T14. .
In the shutoff notification unit 4, the process T14 shuts off the gas passage and shifts to the process 15. Process T15 in the pressure inspection unit 6
Advances the inspection period timer and shifts to the processing T16.

In the pressure determination unit 3, the process T16 determines whether or not the pressure has dropped. If the pressure has dropped, the process proceeds to process T17, and if the pressure has not dropped, the process proceeds to process T18. In the cutoff notification unit 4, the process T17 notifies that there is an abnormality in the pressure and ends the process. In the pressure inspecting unit 6, the process T18 determines whether the inspection period timer has passed a predetermined period (immediately before the end of the time zone in which there is no flow rate), and if the predetermined period has passed, clears the in-inspection period flag. Then, the process proceeds to process T19, and if not elapsed, the process ends. In the shutoff notification unit 4, the process T19 opens the gas passage and ends the process.

In this way, the gas pressure drop test within a certain period, that is, the gas leak test, is conventionally performed by the gas distributor individually visiting the homes of the gas users to check for gas leaks over several hours. According to the present invention, the gas user is required to do what is necessary to do so, or what is made clear only by detecting the gas flow rate for a long period of 30 days by monitoring the gas flow rate. Automatically detects the time period when the gas is not used and makes effective use of the time period when the gas is not used, and automatically shuts off, inspects, and unplugs regularly (every week) without human intervention. In addition, by performing in a short period of time (several hours), it becomes possible to detect gas leaks earlier than before, without restricting the gas usage of gas users, and the gas passage after the gas shutoff device can be detected. No gas leak Period can further improve safety by the shortening.

[0016]

As is apparent from the above description, in the conventional gas leak inspection, the gas distributor individually visits the gas user's house to inspect the gas leak, or the gas leak is checked for a long period of 30 days. What was clarified for the first time by detecting continuous use, in the present invention, the gas user automatically detects the time period when the gas is not used, and regularly shuts off, inspects and unplugs without human intervention. It can be detected in a short time by automatically performing. Moreover, by this, without limiting the gas use of the gas user, and by detecting the gas leak early, it is possible to shorten the dead period of the gas leak in the gas passage after the gas cutoff device. Safety is improved.

[Brief description of drawings]

FIG. 1 is a functional block diagram of a gas shutoff device according to an embodiment of the present invention.

FIG. 2 is a program flowchart of the device.

FIG. 3 is a functional block diagram of a conventional gas shutoff device.

[Explanation of symbols]

 1 Flow rate measurement unit 2 Pressure detection unit 3 Pressure determination unit 4 Interruption notification unit 5 No flow rate learning unit 6 Pressure inspection unit

Claims (1)

[Claims] 1. A flow rate measuring unit that outputs a flow rate signal corresponding to the amount of passing gas, a shutoff unit that shuts off and opens a gas passage downstream from the apparatus, and the flow rate signal is monitored to monitor the flow rate signal during a specific investigation period. Detects and holds the no-flow time zone where there is no
After that, when the flow rate is in the no-time zone, there is no flow rate learning section that outputs a pressure inspection request signal, and when the no flow rate signal is received in the no-flow rate zone, the shutoff section is instructed to shut off the gas passage, The gas shutoff device is provided with a pressure inspecting unit that gives an instruction to detect whether or not the gas passage that has been shut off by the pressure sensing unit that detects fluctuations in the pressure drop has a pressure drop of a predetermined value or more within a predetermined time.