JPH06307632A - Monitoring device for abnormality of gas supplying equipment - Google Patents

Abstract

PURPOSE:To effect the decision of abnormality, detected by the change of the blockading pressure of a gas supplying passage, a gas supplying pressure regulating instrument and the like, only upon detecting the temperature change in the instruments. CONSTITUTION:The title device is provided with a this time storage means 21, storing gas blockading pressure and temperature in a gas pipeline 5 during stopping the use of gas as a this time blockading value and this time temperature when the timer signal of every predetermined times is inputted from a timer means 10, and a previous time value storage means 22, storing this time stored value as the previous time value. The temperature of this time is compared with the same of previous time upon inputting the timer signal from the timer means 10 with a predetermined time interval and when there is a temperature difference higher than a predetermined value, this time blockading pressure is compared with the previous time blockading pressure to decide the abnormality of a gas supplying facility through a comparing and deciding means 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas supply facility abnormality monitoring device for detecting an abnormality in a gas supply passage, a gas supply pressure adjusting device or the like.

[0002]

2. Description of the Related Art In current gas meters, for gas supply equipment on the downstream side of the gas meter, the gas meter is used to monitor the usage time of the gas appliance, and it is judged that the gas appliance has been forgotten to be turned off if the gas appliance is used for a long time above a specified value. A gas shutoff device for stopping the supply of gas is incorporated. As for the gas supply equipment on the upstream side of the gas meter, it has been proposed that the gas pressure fluctuation in the gas pipe when the gas is not used is monitored to detect an abnormality.

A gas supply facility abnormality monitoring device on the upstream side of this type of conventional gas meter will be described with reference to FIG.

In FIG. 3, 1 is a gas cylinder, 2 is a main valve of the cylinder 1, 3 is a pressure regulator, 4 is a gas meter, 5 is a gas pipe, and 6 is a pressure detecting means for measuring the gas pressure connected to the gas pipe 5. , 7 are flow rate detecting means for measuring the gas flow rate in the gas pipe 5, and 8 is a gas appliance. Further, 9 is a closing pressure storing means for storing the pressure measurement signal from the pressure detecting means 6 as a closing pressure reference value immediately after the use of gas is stopped, and 10 is a timing means for outputting a counting signal for every predetermined time,
Reference numeral 11 inputs the pressure measurement signal from the pressure detection means 6, the gas flow rate signal from the flow rate detection means 7 and the timing signal from the timing means 10, and determines the gas blocking pressure after the gas is stopped for a predetermined time from the timing means 10. The gas closing pressure storage means 9 is updated as a gas closing pressure reference value at each timed time signal input, and the updated gas closing pressure reference value is compared with the measured pressure signal from the pressure detecting means 6 after the update, It was composed of gas pressure monitoring means for judging abnormality of the supply equipment.

[0005]

However, in the above-mentioned conventional configuration, the supply pressure of the gas supply equipment is uniformly detected when the gas is not used, and the comparison abnormality determination is performed. Therefore, in the case where the battery is used as the power supply of the supply pressure abnormality monitoring device, the pressure must be constantly detected to make a comparison abnormality determination when the gas is not used, and the number of microcomputer processing steps increases, resulting in an increase in power consumption and a battery The life is shortened. Moreover, when gas is not used, the standard value is uniformly specified (30 mmH ₂ O)
There is a problem that erroneous detection and detection error occur in the determination as to whether or not it is out of the range.

The present invention solves the above-mentioned problems. By inspecting the gas supply pressure when the gas is not used in relation to the temperature inside the gas pipe, there is a pressure rise that is satisfactory with respect to the original standard value. It is an object of the present invention to provide a highly reliable gas supply facility abnormality monitoring device that can realize low power consumption of a power supply for determining whether or not it is accurate at a proper timing and that has few erroneous determinations.

[0007]

To achieve the above object, the present invention provides a pressure detecting means for measuring the pressure of a gas fluid, a flow rate detecting means for measuring the gas flow rate, and a gas pipe for supplying the gas fluid. , A temperature detecting means for measuring the temperature in the gas pipe, a time measuring means for measuring time, and a gas closing pressure and a temperature when the gas is stopped when the time measuring signal is inputted from the time measuring means at a predetermined time A current value storage means for storing the current temperature, a previous value storage means for storing the current storage value from the current value storage means as a previous value, and a predetermined time interval at the time of inputting a time measurement signal for each predetermined time from the time measurement means. If there is a temperature difference of more than a predetermined value by comparing the previous temperature of this time with the current temperature, the comparison judgment means for comparing the previous closing pressure with the current closing pressure to judge the abnormality of the gas supply equipment, and the comparison judgment means Signal to alert It is obtained by a warning means for.

[0008]

According to the present invention, with the above configuration, the temperature in the gas pipe is compared every predetermined time when the gas is not used, and only when there is a temperature change of a predetermined value or more, the pressure of the closing pressure at a predetermined time interval is compared. Determine whether there is a rise. Therefore, the abnormality (leakage etc.) of the gas supply equipment can be detected by temperature correction, and since the comparison determination of the closing pressure is performed only when the predetermined temperature changes, the number of processing steps of the microcomputer can be reduced and the power consumption can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a gas supply facility abnormality detection device 12 of the present invention comprises a gas pressure detection means 6 for detecting the gas pressure of a gas supply facility provided downstream of a gas pressure regulator 3, and the gas supply system. Gas flow rate detecting means 7 for detecting the flow rate of gas flowing through the equipment, gas pipe 5 for supplying the gas fluid, and temperature measuring means 20 for measuring the temperature in the gas pipe.
And a current value storage means 21 for storing the gas blockage pressure and the temperature when the gas is not used as the current blockage pressure value and the current temperature when the clock signal is input from the clocking means 10 at predetermined time intervals. And the previous value storage means 22 that stores the current storage value from the current value storage means 21 as the previous value.
When the timekeeping signal is input from the timekeeping means 10 every predetermined time, the previous temperature and the current temperature are compared at a predetermined time interval, and if there is a temperature difference of a predetermined value or more, the previous closing pressure and the current closing are performed. It is composed of a comparison judgment means 23 for comparing the pressures to judge the abnormality of the gas supply equipment, and a warning means 24 for issuing a warning by a signal from the comparison judgment means 23. Other components having the same numbers as those in FIG. 3 have the same names and functions.

The comparison and determination means 23 compares the closing pressures only when the temperature rises, and makes the following gas leakage determination.

FIG. 2 shows the change of the outside air temperature (Ta) at each time T and the change of the closing pressure when the gas is not used, which is accompanied by the outside air temperature and the one-dot chain line shows the closing pressure. The gas temperature in the gas pipe 5 is almost outside air temperature (Ta)
Indicates a value close to.

As shown in FIG. 2, when the gas of T = T1 to T2, which is a timing signal from the timing means 10 at predetermined time intervals (ΔT), is not used, the gas piping 5 is exposed to sunlight, the temperature of the outside air changes, etc. Gas pressure rises due to temperature rise (pressure rise of blockage gas: according to Boyle-Charles' law, 37.8
[MmH ₂ O / ° C.]). Occurs. At this time, as shown by the solid line, the temperature in the gas pipe 5 rises from around 6:00 at about the same time as the outside air temperature, and tends to rise until around 14:00. During this period, the comparison and determination means 23 has T = T1 to T.
The temperature rise of the gas pipe 5 (Ta
2-Ta1) is greater than or equal to a predetermined value (for example, 1 ° C. or more), the blocking pressure rises at T = T1 to T2 (P2-P).
If 1) is a predetermined value or more (for example, 30 mmH ₂ O),
It is determined that there is no gas leakage from the pressure regulator 3, which is the gas supply facility, the gas pipe 5, the gas meter 4, the gas appliance 8, which is the gas consumption facility, and the like.

However, when there is a temperature change of a predetermined value (for example, 1 ° C.) or more, a predetermined value (for example, 30 mmH ₂ O)
If the above pressure increase does not occur, the comparison and determination means 23 can determine that there is a leak from the gas supply equipment (pressure regulator 3, gas meter 4, gas pipe 5). When such a situation occurs at a predetermined frequency, it is determined that there is a leak from the gas supply equipment, and an alarm signal is output to the alarm means 24. The alarm means 24 that has received the alarm signal lights up or blinks the LED or LCD to warn of an abnormal gas leak, or reports to a gas supplier or the like via a telephone line.

The temperature change of the gas pipe 5 when T = T4 to T5 is not used is 14:
It shows a downward trend from 00. Along with this, the blocking pressure is reduced to a predetermined pressure level (adjustment pressure of the pressure adjuster 3) by the governor characteristic of the pressure adjuster 3 due to gas contraction in the gas supply equipment. If there is no temperature rise (equal to or more than a predetermined value), no expansion phenomenon is observed, and it is not necessary to make a comparison determination with the leakage determination standard of the closing pressure. Therefore, the process of comparing and determining the closing pressure is necessary only when the temperature rises.

In this embodiment, it goes without saying that the same effect can be obtained even if the gas supply facility abnormality monitoring device 12 is built in the gas meter 4.

Needless to say, the same effect can be obtained even if the gas supply facility abnormality monitoring device 12 is built in the pressure regulator 3.

[0018]

As described above, the gas supply facility abnormality detecting device of the present invention has the following advantages.

Although the probability of erroneous detection due to noise or the like increases in the structure for constant comparison and judgment even when unnecessary, the structure of the present invention makes erroneous detection due to the structure for judging and comparing the value of the closing pressure at a predetermined temperature change. It is possible to provide highly reliable gas supply equipment abnormality monitoring with few detection errors.

Further, since the comparison determination process of the closing pressure is performed only when the predetermined temperature changes, the number of processing steps of the microcomputer can be reduced and the power consumption can be reduced.

[Brief description of drawings]

FIG. 1 is a control block diagram of a gas supply facility abnormality monitoring device according to an embodiment of the present invention.

FIG. 2 is a relationship diagram between the outside air temperature and the closing pressure.

FIG. 3 is a control block diagram of a conventional gas supply facility abnormality monitoring device.

[Explanation of symbols]

 3 pressure regulator 6 pressure detecting means 7 flow rate detecting means 8 gas appliance 10 time measuring means 12 gas supply facility abnormality monitoring device 20 temperature detecting means 21 current value storing means 22 previous value storing means 23 comparison judging means 24 alarm means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Miyauchi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A pressure regulator for adjusting the pressure of a gas fluid, a pressure measuring means for measuring the pressure of the gas fluid, a flow rate detecting means for measuring the flow rate of the gas fluid, and a gas for supplying the gas fluid. Piping, temperature measuring means for measuring the temperature inside the gas piping, time measuring means for measuring time, and the inside of the gas piping in a gas stopped state at the time of inputting a time measuring signal for each predetermined time from the time measuring means. The current value storage means for storing the gas occlusion pressure and the temperature as the present occlusion pressure value and the current temperature, the previous value storage means for storing the present storage value from the present value storage means as the previous value, and the predetermined value from the timekeeping means. When inputting a time signal for each hour, compare the previous temperature with the current temperature at a predetermined time interval, and if there is a temperature difference of more than a predetermined value, compare the previous closing pressure with the current closing pressure to check the gas supply facility Make an abnormality judgment A gas supply facility abnormality monitoring device comprising a comparison determination means and an alarm means for issuing an alarm by a signal from the comparison determination means.