JP2760242B2 - Gas pressure abnormality monitoring 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 pressure abnormality monitoring device for detecting an abnormality in a gas supply path, a gas supply pressure adjusting device, and the like.

[0002]

2. Description of the Related Art On the downstream side from a gas meter, the gas meter monitors the usage time of the gas appliance, judges that the gas appliance has been forgotten to turn off the gas appliance for a long time exceeding a specified value, and stops the gas supply. It is being incorporated. On the upstream side from the gas meter, there has been proposed an apparatus that monitors a gas pressure fluctuation based on a gas pressure in a gas pipe and a gas flow rate supplied from the gas meter to a gas appliance and detects an abnormality.

FIG. 9 is a sectional view of a conventional apparatus for detecting an abnormal gas pressure on the upstream side of a gas meter of this type.

In FIG. 9, 1 is a gas cylinder, 2 is a main stopper of the cylinder 1, 3 is a pressure regulator, 4 is a gas meter, 5 is a gas pipe, 6 is a pressure sensor connected to the gas pipe 5 for measuring gas pressure, Reference numeral 7 denotes a flow sensor as gas flow detecting means for measuring a gas flow in the gas pipe 5, and reference numeral 8 denotes a gas appliance. Further, 9 is a comparator that inputs a flow signal from the flow sensor 7, 10 is a comparator that inputs a pressure detection signal from the pressure sensor 6, 11 is a gate circuit that inputs an output signal from the comparators 9 and 10, and performs a logical product operation. Connected to output the calculated output to the timer circuit 12,
The timer circuit 12 is connected so as to output a signal to the output means 13 at the next stage if the output signal from the gate circuit 11 continues for a predetermined time or more. Then, when the flow rate sensor 7 detects a predetermined flow rate or more, that is, when the gas appliance 8 is used, the pressure detection signal from the pressure sensor 6 is equal to or more than a predetermined upper limit value (for example, 330 mmH ₂ O) or a predetermined value. If it is equal to or less than the lower limit value (for example, 230 mmH ₂ O), the gate circuit 11 outputs an output signal at the time of abnormality to the timer circuit 12, and in the timer circuit 12, this state is abnormal to the output means 13 when the predetermined time continues. Output the output signal. The output means 13 turns on or blinks an LED indicating a predetermined gas pressure abnormality, or stops gas supply.

[0005]

However, in the above-mentioned conventional configuration, the detection of the gas pressure abnormality when using the gas is performed when the flow rate sensor detects a predetermined flow rate or more, that is, at the same time when the gas appliance is started to be used. It is configured to detect the pressure detection signal and compare and determine with a predetermined upper and lower limit value. On the other hand, a gas cylinder as a gas supply facility is placed outdoors and is affected by fluctuations in outside air temperature, and a phenomenon in which gas in a high-pressure gas pipe between the gas cylinder and the pressure regulator liquefies, a so-called reliquefaction phenomenon occurs. . When this phenomenon occurs, the gas pressure at the start of use of the gas is liquefied, and the gas cannot be detected normally during this time. Therefore, when a pressure abnormality test of the gas use pressure range is performed at a fixed timing immediately after the start of use of the gas, even if there is no abnormality in the gas supply equipment, it is erroneously detected that there is an abnormality due to the reliquefaction phenomenon. There was a problem of making a judgment.

The present invention solves the above-mentioned problem, and is intended to avoid the influence of the gas pressure fluctuation at the start of gas use when a gas non-use state continues for a long time or when a reliquefaction phenomenon occurs due to an outside air temperature fluctuation or the like. It is an object of the present invention to provide a highly reliable gas pressure abnormality monitoring device that detects a pressure detection signal from a pressure sensor and correctly performs a pressure abnormality test when using gas without erroneous detection.

[0007]

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a pressure regulator for adjusting the pressure of a gas fluid, a pressure sensor for measuring the pressure of the gas fluid, a gas flow detecting means for measuring a gas flow, A gas pipe for supplying a fluid, a first timer for measuring an elapsed time of gas blockage from when the gas is stopped, and a second timer for measuring a measurement delay time proportional to the elapsed time of gas blockage from the start of the gas use. Means, a measurement pressure signal from the pressure sensor, and a gas flow rate signal from the gas flow rate detection means, and after a pressure measurement delay time elapse signal is input from the second timing means, the measurement pressure signal and a predetermined gas Gas pressure comparing means for comparing with a limit value of the adjustment pressure range.

A pressure regulator for adjusting the pressure of the gas fluid; a pressure sensor for measuring the pressure of the gas fluid; gas flow detecting means for measuring the gas flow; a gas pipe for supplying the gas fluid; Temperature detecting means for detecting a temperature having a correlation with temperature, and time measuring means for measuring a pressure measurement delay time corresponding to a temperature detection deviation value between a temperature detection value when gas usage is stopped and a temperature detection value when gas usage is restarted. And a measurement pressure signal from the pressure sensor and a gas flow rate signal from the gas flow rate detection means, and after a pressure measurement delay time elapse signal is input from the timing means, the measurement pressure signal and the predetermined gas adjustment pressure range Gas pressure comparing means for comparing with a limit value.

[0010]

According to the present invention, the following effects can be obtained by the above configuration.

[0011]

[0012] When the gas non-use state continues for a long time, the amount of reliquefaction in the gas pipe according to the gas non-use period is assumed, and the effect of gas pressure fluctuations at the start of gas use is sufficiently and shortly avoided. By detecting the pressure detection signal from the pressure sensor at the timing when the pressure is detected, it is possible to quickly and accurately perform the pressure abnormality test when using the gas without erroneous detection.

[0013] The amount of re-liquefaction is assumed in accordance with the temperature deviation between the temperature detection value when gas use is stopped and the temperature detection value when gas use is resumed due to fluctuations in outside air temperature and the like. By detecting the pressure detection signal from the pressure sensor at a timing that avoids the influence of the gas sufficiently and in the shortest time, it is possible to quickly and accurately perform a pressure abnormality test when using gas without erroneous detection.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals and described.

FIG. 1 is a control block diagram of a gas pressure abnormality monitoring device according to a first embodiment. In the figure, reference numeral 14 denotes a time-measuring means for inputting a flow signal from the flow sensor 7 and counting a predetermined time from the start of use of the gas. Reference numeral 15 denotes a pressure detection signal from the pressure sensor 6 and a flow signal from the flow sensor 7. And enter the timekeeping means 1
4, the measured pressure signal after the start of gas use is changed to a predetermined gas adjustment pressure limit value [upper limit (for example, 330 mmH ₂ O), lower limit (for example, 230 mmH ₂ O)]. ] Is a gas pressure comparing means. Further, the gas pressure comparing means 15 determines that the gas piping or the pressure regulator is abnormal when the gas pressure abnormality is detected, and
It is connected to notify a gas supplier (not shown). The operation of the above configuration will be described. 2 and 3 show pressure detection signals from the pressure sensor 6 at the start of gas use. The pressure detection signal is configured to output an analog output signal proportional to the gas pressure. FIG. 2 shows the pressure at the start of gas use at normal time (when gas is used intermittently, that is, when gas is liquefied and does not stay in the high-pressure gas pipe between the gas cylinder and the pressure regulator). FIG. 3 shows the detection signal when the gas in the gas pipe is reliquefied (when the gas is not used for a long time or when the temperature fluctuates, that is, when the gas is introduced into the high-pressure gas pipe between the gas cylinder and the pressure regulator). Is a pressure detection signal at the start of gas use at the time of liquefaction and stagnation (so-called re-liquefaction). 2 and 3, T = T0 to T1 are pressure detection signals when gas is not used, and T = T1 is pressure detection signals when gas is used. As shown in FIG. 2, in the normal, immediately (within 1-2 seconds) after the start of the gas operating pressure adjustment pressure range of the pressure regulator (generally, 230mmH ₂ O~330mmH ₂ O) is stable. As shown in FIG. 3, at the time of gas reliquefaction in the gas pipe, the pressure does not stabilize immediately after the start of use of the gas, but takes several seconds to several tens of seconds, for example, to stabilize in the adjustment pressure range of the pressure regulator.

<Pressure Fluctuation Inspection at Start of Gas Use> In FIGS. 2 and 3, at the start of gas use at T = T1, the flow sensor 7 detects the start of gas use, and sends the liquefied gas in the gas pipe to the timer 14. And outputs a timing start signal for measuring a measurement delay time (Td in FIG. 3) corresponding to the time when the pressure unstable state due to the pressure is eliminated.
To output a flow pulse signal to inform that the gas has started to be used. The gas pressure comparing means 15 receives the pressure measurement delay time elapse signal from the
Predetermined gas adjusting pressure limit value the pressure detection signal from the start the comparison test with the [upper limit value (330mmH ₂ O), lower limit (230mmH ₂ O)]. Here, the gas pressure comparing means 15
When a pressure value outside the gas regulation pressure limit value is detected, for example, when the same type of abnormality is confirmed a predetermined number of times, it is determined that the gas pipe is leaking or the pressure regulator is abnormal, and the telephone line interface 16 is disconnected. By phone line through
You notification to the gas supplier (not shown). In addition, monitoring the gas confinement pressure after the gas appliance is stopped, the outside air temperature rises, by detecting the pressure increase of the gas occlusion pressure by sunlight or the like, clogging the pressure fluctuations determines the gas pipe leak, the presence or absence of pressure regulator abnormal When applied to a monitoring device, it generally takes a certain time to recover the gas pressure value before starting gas use after stopping gas use. When used for a short time, the recovery time further increases. Therefore, when the gas pressure has sufficiently recovered to the value before using the gas, the gas pressure (blocking pressure) is detected, and based on the initial gas blocking pressure, the gas blocking pressure is measured at regular time intervals. Need to be compared. That is, a delay time assuming a liquefaction phenomenon for a fixed time further than the general signal detection delay time (Td in FIG. 3).
If the time obtained by adding is used as the total delay time, it is possible to accurately and accurately monitor pressure fluctuations due to an increase in outside air temperature after the gas appliance is stopped.

In this embodiment, the pressure sensor 6 and the flow sensor 7 are configured to be connected to the outside of the gas meter 4. However, the same effect can be obtained by a structure built in the gas meter 4.

Second Embodiment FIG. 4 is a control block diagram of a gas pressure abnormality monitoring and comparing device according to a second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals and described. In the figure, reference numeral 17 denotes a first timing means for measuring an elapsed time of gas blocking from the time of stopping gas use, and reference numeral 18 denotes a second time for measuring a pressure measurement delay time proportional to the elapsed time of gas blocking from the start of gas use. The timer means 19 receives the measured pressure signal from the pressure sensor, the gas flow rate signal from the gas flow rate detecting means, and the gas blocking elapsed time from the first timing means, and inputs the gas blocking elapsed time to the second timing means. Gas pressure comparing means for setting a pressure measurement delay time correlated with the above, and comparing the measured pressure signal with a limit value of a predetermined gas adjustment pressure range after inputting a signal indicating the elapse of the pressure measurement delay time from the second timing means. It is. Further, the gas pressure comparing means 19 determines that the gas pipe or the pressure regulator is abnormal when the gas pressure abnormality is detected, and notifies the gas supplier (not shown) via the telephone line via the telephone line interface 16 to notify the gas supplier. Have been. The operation of the above configuration will be described. FIG. 5 shows the gas blocking pressure continuation time (TST
3 shows a correlation between P) and the amount of gas liquefied in a high-pressure gas pipe between a gas cylinder and a pressure regulator. The amount of gas liquefied in the high-pressure gas pipe between the gas cylinder and the pressure regulator has a relationship that is substantially proportional to the gas closing pressure duration (TSTP). Therefore, when the gas in the gas pipe shown in FIG. 3 of the first embodiment is reliquefied, the required gas pressure stabilization time (Td) after the start of use of the gas.
Is proportionally determined according to the gas occlusion pressure duration (TSTP).

<Pressure Fluctuation Inspection at the Start of Gas Use> When the gas use is stopped, the flow sensor 7 detects the stoppage of the flow pulse signal, and the first timer 17 starts measuring the gas blocking pressure continuation time. Thereafter, at the start of gas use at T = T1 in FIG. 3 of the first embodiment, a flow rate pulse signal is input by the flow rate sensor 7 to detect the start of gas use. He gas closing pressure duration (TSTP)
Is output. The gas pressure comparing means 19 receives the gas blocking pressure continuation time (TSTP) and sets the time when the pressure unstable state proportional to the gas blocking pressure continuation time is eliminated as a measurement delay time (Td in FIG. 3) as a second time. It is set in the timer 18. Second
Of the gas closing pressure (TST)
Measure the pressure measurement delay time in proportion to P). When the gas pressure comparing means 19 receives the pressure measurement delay time elapse signal from the second timing means 18, the gas pressure comparing means 19 converts the pressure detection signal from the pressure sensor 6 into a predetermined gas adjustment pressure limit value [upper limit value (330 mm
H ₂ O), initiates a comparison test between the lower limit value (230mmH ₂ O)]. Here, when the gas pressure comparing means 19 detects a pressure value outside the gas regulation pressure limit value, for example, when it confirms the same kind of abnormality a predetermined number of times, the gas pressure comparison means 19 determines that the gas pipe leaks or the pressure regulator is abnormal. The determination is made, and a notification is sent to a gas supplier (not shown) by a telephone line via the telephone line interface 16. Therefore, when the pressure abnormality test after the start of gas use has continued for a long time without gas use,
Assuming the amount of reliquefaction in the gas pipe according to the gas non-use period, detecting the pressure detection signal from the pressure sensor at a timing that sufficiently and in a short time avoids the effect of gas pressure fluctuation at the start of gas use Accordingly, a pressure abnormality test when using gas can be performed quickly and accurately without erroneous detection. In addition, monitoring the gas blockage pressure after the gas appliance is stopped, and detecting the rise in the gas blockage pressure due to an increase in the outside air temperature, solar radiation, etc., to determine whether there is a leak in the gas pipe or an abnormality in the pressure regulator. When the present invention is applied to the apparatus, it operates in the same manner as in the first embodiment, and can accurately and accurately monitor pressure fluctuations due to an increase in the outside air temperature after the gas appliance is stopped.

In this embodiment, the pressure measurement delay time (T
d) is obtained by calculation as a time proportional to the gas occlusion pressure continuation time (TSTP). However, the correction time is adjusted in consideration of the region and the climate, and the pressure detection signal at the start of use is observed. The same effect can be obtained even if learning and changing are performed in accordance with.

In the present embodiment, the pressure sensor 6 and the flow sensor 7 are configured to be connected to the outside of the gas meter 4.

Third Embodiment FIG. 6 is a control block diagram of a gas pressure abnormality monitoring and comparing device according to a third embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals and described. In the figure, reference numeral 20 denotes a temperature detecting means (thermistor or the like) for detecting a temperature having a correlation with the gas fluid temperature, and reference numeral 21 denotes a temperature deviation between a temperature detection value when gas usage is stopped and a temperature detection value when gas usage is restarted. A timer 22 for measuring a pressure measurement delay time according to the value; a measurement pressure signal 22 from the pressure sensor, a gas flow rate signal from the gas flow rate detection means, and a temperature detection value from the temperature detection means 20; Means for setting a pressure measurement delay time according to the temperature deviation value to the means, and after inputting an elapsed signal of the pressure measurement delay time from the timer means, comparing the measured pressure signal with a limit value of a predetermined gas adjustment pressure range. It is a comparison means. Further, the gas pressure comparing means 22 is connected to determine that the gas pipe or the pressure regulator is abnormal when detecting the gas pressure abnormality, and notify the gas supplier (not shown) via the telephone line via the telephone line interface 16. Have been. The operation of the above configuration will be described. FIG. 7 shows the outside air temperature (T
The relationship between a) and time (T) is shown. The outside air temperature generally tends to indicate a minimum temperature (Ta (min)) in the early morning and a maximum temperature (Ta (max)) in the afternoon on a day in fine weather. Therefore, as shown in FIG. 8, the gas liquefaction amount (QG) in the high-pressure gas pipe between the gas cylinder and the pressure regulator is:
In particular, when the gas is in a non-use state from the recording time of the maximum temperature (Ta (max)) to the recording time of the minimum temperature (Ta (min)), the gas reaches the maximum (ΔTa (max)), and the temperature when the gas usage is stopped. It is substantially proportional to the temperature deviation (ΔTa) between the detected value and the temperature detected at the time of resuming gas use. Therefore,
At the time of gas reliquefaction in the gas pipe shown in FIG. 3 of the first embodiment, the gas pressure stabilization required time (Td) after the start of gas use is proportionally determined according to the temperature deviation (ΔTa).

<Pressure Fluctuation Inspection at the Start of Gas Use> When the gas use is stopped, the flow sensor 7 detects the stop of the flow pulse signal, and the gas pressure comparison means 22 stores the detected temperature value from the temperature detection means 20. Thereafter, T in FIG.
= Gas pressure comparison means 22 at the start of gas use at T1
Inputs a flow rate pulse signal with the flow rate sensor 7, detects the start of gas use, inputs a temperature detected value from the temperature detecting means 20, calculates a deviation from the temperature detected value stored when the gas use is stopped, The time during which the unstable pressure state that is proportional to the temperature deviation value is eliminated is set as the measurement delay time (Td in FIG. 3) in the timer unit 21. The time measuring means 21 measures a pressure measurement delay time proportional to the set temperature detecting means deviation value. The gas pressure comparing means 22 receives the pressure measurement delay time elapse signal from the time measuring means 21 and converts the pressure detection signal from the pressure sensor 6 to a predetermined gas adjustment pressure limit value [upper limit value (33
0 mmH ₂ O) and the lower limit (230 mmH ₂ O)]. Here, the gas pressure comparison means 22
When detecting a pressure value outside the above gas regulation pressure limit value,
For example, when the same kind of abnormality is confirmed a predetermined number of times,
It is determined that the gas pipe leaks or the pressure regulator is abnormal, and notifies the gas supplier (not shown) through the telephone line via the telephone line interface 16. Therefore, the amount of re-liquefaction is assumed in accordance with the temperature deviation between the temperature detection value when gas usage is stopped and the temperature detection value when gas usage is restarted due to outside air temperature fluctuation, etc. By detecting the pressure detection signal from the pressure sensor at a timing to avoid the influence sufficiently and in the shortest time, it is possible to quickly and accurately perform a pressure abnormality test when using gas without erroneous detection. In addition, monitoring the gas blockage pressure after the gas appliance is stopped, and detecting the pressure increase of the gas blockage pressure due to an increase in the outside air temperature, solar radiation, etc., to determine the presence or absence of gas pipe leaks and pressure regulator abnormalities. When the present invention is applied to the apparatus, it operates in the same manner as in the first embodiment, and can accurately and accurately monitor pressure fluctuations due to an increase in outside air temperature after the gas appliance is stopped.

In this embodiment, the pressure measurement delay time (T
d) is obtained by calculation as a time proportional to the temperature deviation (ΔTa). However, the correction time is adjusted in consideration of the area and the climate, or a pressure detection signal at the start of use is observed, and the measured value is adjusted according to the actual situation. The same effect can be obtained by learning and changing.

In the present embodiment, the pressure sensor 6 and the flow sensor 7 are configured to be connected to the outside of the gas meter 4.

[0026]

According to the gas pressure abnormality monitoring apparatus of the present invention described above, according to the present invention, Ru effect there below. (1) When the gas non-use state continues for a long time, the amount of re-liquefaction in the gas pipe is assumed according to the gas non-use period, and the effect of gas pressure fluctuations at the start of gas use is sufficiently and shortly avoided. By detecting the pressure detection signal from the pressure sensor at the appropriate timing, it is possible to quickly and accurately perform a pressure abnormality test when using gas without erroneous detection, and it is possible to inspect gas pipe leaks or pressure regulation equipment abnormalities. . (2) Due to fluctuations in the outside air, etc., the amount of re-liquefaction is assumed in accordance with the temperature deviation between the temperature detection value when gas use is stopped and the temperature detection value when gas use is resumed, and gas pressure fluctuations occur at the start of gas use. By detecting the pressure detection signal from the pressure sensor at a timing that avoids the influence of the gas sufficiently and in the shortest time, the pressure abnormality test when using gas can be performed quickly without erroneous detection.
It can be performed accurately and can check for leaks in gas piping or abnormalities in pressure regulating equipment.

[Brief description of the drawings]

FIG. 1 is a control block diagram of a gas pressure abnormality monitoring device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a pressure change characteristic of the same device in a normal state.

FIG. 3 is a pressure change characteristic diagram during gas reliquefaction in the same device.

FIG. 4 is a control block diagram of a gas pressure abnormality monitoring device according to a second embodiment of the present invention.

FIG. 5 Gas blocking pressure duration (TSTP) in the same device
Of the relationship between gas and gas liquefaction (QG)

FIG. 6 is a control block diagram of a gas pressure abnormality monitoring device according to a third embodiment of the present invention.

FIG. 7 is a diagram showing the relationship between each time of day and the outside air temperature.

FIG. 8 is a diagram showing a relationship between a temperature deviation (ΔTa) and a gas liquefaction amount (QG) in the apparatus.

FIG. 9 is a control block diagram of a conventional gas pressure abnormality monitoring device.

[Explanation of symbols]

 Reference Signs List 3 pressure regulator 5 gas pipe 6 pressure sensor 7 gas flow detecting means 14 time measuring means 15 gas pressure comparing means

Claims (2)

(57) [Claims] A pressure regulator for regulating the pressure of the gas fluid;
Subjected a pressure sensor, a gas flow rate detection means for measuring the gas flow rate, the gas fluid for measuring the pressure of the gaseous fluid
A gas pipe to be supplied, a first timer for measuring an elapsed time of gas blockage from a time when gas use is stopped, and a second timer for measuring a measurement delay time proportional to the gas blockage elapsed time from the start of gas use. And a measurement pressure signal from the pressure sensor and a gas flow rate signal from the gas flow rate detection means, and after a pressure measurement delay time elapse signal is input from the second time measurement means, the measurement pressure signal and A gas pressure abnormality monitoring device comprising: a gas pressure comparison means for comparing a gas regulation pressure range with a predetermined limit value. 2. A pressure regulator for regulating the pressure of a gas fluid,
Subjected a pressure sensor, a gas flow rate detection means for measuring the gas flow rate, the gas fluid for measuring the pressure of the gaseous fluid
A gas pipe to be supplied, a temperature detecting means for detecting a temperature having a correlation with the gas fluid temperature, and a pressure corresponding to a temperature deviation between a temperature detection value when the gas is stopped and a temperature detection value when the gas is restarted. Time measurement means for measuring the measurement delay time, a measured pressure signal from the pressure sensor, and a gas flow rate signal from the gas flow rate detection means are input, and after a pressure measurement delay time elapse signal is input from the time measurement means, A gas pressure abnormality monitoring device comprising: a gas pressure comparison unit that compares the measured pressure signal with a limit value of a predetermined gas adjustment pressure range.