JP2000032622A - Soundness diagnosing method of gas pressure detecting apparatus, gas pressure detecting apparatus, gas density detecting apparatus, and gas density monitoring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soundness diagnosing method capable of confirming soundness of a pressure sensor and obtain a gas pressure detecting apparatus provided with a soundness diagnosing means of the pressure sensor. SOLUTION: A measurement auxiliary apparatus 5 has a main body part 6, to which a pressure sensor 12 is fixed and a piston chamber part 8. The piston chamber part 8 and the main body part 6 constitute a gas chamber 11 for pressure measurement which can change volume. An electric signal Vout from the pressure sensor 12 is converted into gas pressure by a signal processing means 21. A pressure change detecting means 22 calculates a pressure change value from a normal pressure from the signal processing means 21, and a test pressure when a pressure is changed. An electromagnetic valve 13 is closed, connection with a vessel 1 is cut off, a piston 8a is moved in above direction of the figure, the pressure in the gas chamber 11 for pressure measurement is increased by a specified value, and comparison with a pressure change value detected by the pressure change detecting means 22 is made. Thereby soundness of the pressure sensor 12 can be diagnosed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for diagnosing the soundness of a gas pressure detecting device for detecting the pressure of a gas in a container containing a charged portion and containing a charged portion, a gas pressure detecting device, and detecting a gas density. The present invention relates to a gas density detecting device and a gas density monitoring device for monitoring a gas density.

[0002]

2. Description of the Related Art FIG.
FIG. 9 is a configuration diagram of a conventional gas density monitoring device disclosed in Japanese Patent Application Publication No. 9-No. 9; In FIG. 11, a gas pressure in a container 1 in which gas is sealed and a charging section (not shown) is accommodated is detected by a pressure detector 2, and a gas temperature in the container 1 is detected by a temperature detecting means 3. Then, based on the gas pressure and the gas temperature, the calculating means 4 calculates a gas density converted into a gas pressure at a gas temperature of 20 ° C.

[0003] Further, as described in, for example, JP-A-8-136606, an accident point detecting device of a gas insulated electric device which attempts to locate an accident point based on a minute pressure fluctuation in a container 1 or the like. Similarly, the pressure sensor used for detecting the gas pressure in the container.

[0004]

Since the conventional gas density monitoring device is configured as described above, there is a problem that the soundness of the pressure detector 2 as a pressure sensor cannot be confirmed. In the case of a gas pressure detection device used to detect an accident point of gas insulated electrical equipment or to detect gas pressure to monitor gas density, it is required for locating the accident point and early detection of gas leakage. However, there is a problem that the soundness of the function of reliably detecting a minute pressure change cannot be confirmed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a method of diagnosing a soundness of a gas pressure detecting device, in which a pressure sensor can detect a change in gas pressure and confirm that the gas pressure sensor is sound. The purpose is to provide. Another object of the present invention is to provide a gas pressure detecting device, a gas density detecting device, and a gas density monitoring device provided with a soundness diagnosing means capable of confirming that a pressure sensor is sound. further,
It is an object of the present invention to obtain a gas pressure detecting device capable of knowing the detection characteristics of a pressure sensor by calculating two or more test pressure values.

[0006]

In order to achieve the above object, in a method for diagnosing the soundness of a gas pressure detecting device according to the present invention, a gas sensor is used to measure the gas pressure in a container in which gas is charged and which contains a charging section. A first gas pressure measuring step of detecting as a first pressure signal, and a second gas pressure of changing the gas pressure in the container by a predetermined value and detecting this gas pressure as a second pressure signal by a pressure sensor A measuring step and a soundness diagnosing step of diagnosing the soundness of the pressure sensor from the first and second pressure signals are provided. The gas pressure in the container is changed by a predetermined value, and this value is compared with a value detected by the pressure sensor to diagnose the soundness of the pressure sensor.

In the first gas pressure measuring step, the gas pressure in the pressure measuring gas chamber connected to the container is detected as a first pressure signal by a pressure sensor, and in the second gas pressure measuring step, A communication disconnection step of interrupting the communication between the pressure measurement gas chamber and the container, and changing the volume of the pressure measurement gas chamber that has interrupted the communication with the container by a predetermined amount to reduce the pressure of the pressure measurement gas chamber by a predetermined value. The method has a pressure change step of changing the pressure, and detects the gas pressure in the pressure measurement gas chamber as a second pressure signal by a pressure sensor. Since the volume of the gas chamber for pressure measurement is smaller than the volume of the container, the pressure can be easily changed.

[0008] Further, the gas pressure detecting device of the present invention comprises a pressure sensor for detecting a gas pressure in a container in which a gas is sealed and containing a charging section as a pressure signal, and a gas for changing the gas pressure in the container by a predetermined value. Diagnose the soundness of the pressure sensor based on the first pressure signal at a predetermined time detected by the pressure change device and the pressure sensor and the second pressure signal when the gas pressure in the container is changed by a predetermined value. Soundness diagnosis means. The gas pressure in the container is changed by a predetermined value, and this value is compared with a value detected by the pressure sensor to diagnose the soundness of the pressure sensor.

In addition, an on-off valve connected to the container and a measurement auxiliary device having a gas chamber for pressure measurement communicated with the container via the on-off valve are provided, and a pressure sensor is used to measure the gas pressure in the gas chamber for pressure measurement. The first pressure signal at a predetermined time detected by the pressure sensor and the gas in the pressure measurement gas chamber in a state in which the communication with the container is shut off by closing the on-off valve and the soundness diagnosis means shall be detected as a pressure signal. The soundness of the pressure sensor is diagnosed based on the second pressure signal when the pressure is changed by a predetermined value. Since the volume of the gas chamber for pressure measurement is smaller than the volume of the container, the pressure can be easily changed.

[0010] The auxiliary measuring device can change the volume of the gas chamber for pressure measurement, and the soundness diagnosing means closes the on-off valve and the first pressure signal at a predetermined time detected by the pressure sensor. A second pressure signal when the gas pressure in the gas chamber for pressure measurement is changed by a predetermined value by interrupting communication with the container and changing the volume of the gas chamber for pressure measurement by a predetermined amount, and It is characterized by diagnosing soundness. If the volume of the gas chamber for pressure measurement is changed by a predetermined amount, the gas pressure in the gas chamber for pressure measurement changes by a predetermined value, and this value is compared with the value detected by the pressure sensor to check the soundness of the pressure sensor. Diagnose.

Further, the soundness diagnosing means is provided with characteristic calculating means for changing the pressure of the pressure measuring gas chamber by first and second predetermined values and calculating the detection characteristic of the pressure sensor based on each pressure signal at this time. It is characterized by having. The detection characteristic of the pressure sensor can be known from the pressure signal of the pressure sensor at that time by changing the volume of the pressure measurement gas chamber by the first and second predetermined amounts.

Further, the invention is characterized in that test pressure generation instructing means and volume control means for changing the volume of the pressure measuring gas chamber by a predetermined amount in accordance with an instruction signal from the test pressure generation instructing means are provided. The pressure is changed by changing the volume of the pressure measuring gas chamber by a predetermined amount by the test pressure generation instructing means, and this is detected as a second pressure signal.

A gas supply / discharge device for supplying / discharging gas to / from the pressure measurement gas chamber of the measurement auxiliary device is provided, and the soundness diagnostic means is used to close the first pressure signal at a predetermined time detected by the pressure sensor and the on-off valve. The gas pressure in the gas chamber for pressure measurement is changed by a predetermined value by shutting off communication with the container and supplying or discharging gas from the gas chamber for pressure measurement by the supply / discharge device. The soundness of the pressure sensor is diagnosed on the basis of the second pressure signal at the time of the occurrence. If gas is supplied or discharged to the pressure measurement gas chamber, the pressure changes, and the pressure is detected as a second detection signal. Further, since the volume of the pressure measurement gas chamber is smaller than the volume of the container, the pressure can be easily changed.

Further, a gas density detecting device according to the present invention includes any one of the gas pressure detecting devices described above, a temperature detecting means for detecting a gas temperature in the container as a temperature signal, and a gas pressure and gas temperature. Gas density calculating means for calculating gas density. When the gas density is detected from the gas pressure and temperature, the soundness of the gas density detecting device can be checked by checking the soundness of the gas pressure detecting device that detects the gas pressure.

Further, a gas density monitoring apparatus according to the present invention is provided with the above-described gas density detecting apparatus and a notifying means for notifying when the calculated gas density is below a predetermined value.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 and 2 show an embodiment of the present invention. FIG. 1 is a configuration diagram of a gas density detecting device, and FIG. 2 is an explanatory diagram for explaining an operation. In FIG. 1, reference numeral 1 denotes a container containing a 550 kV three-phase batch main bus 1a, which is a charging section, and is filled with a gas such as sulfur hexafluoride gas. 3 is a temperature detecting means for detecting the temperature of the gas in the container 1.

Reference numeral 5 denotes a measurement auxiliary device, which has a cylindrical main body 6 and a volume variable section 7 integrally provided on the side wall. The volume variable portion 7 as a gas pressure changing device has a piston chamber portion 8 whose volume is changed by a piston 8a, a spring 9, and a solenoid 10. The main body 6 and the piston chamber 8 constitute a gas chamber 11 for pressure measurement. When an electric current is applied to the solenoid 9, the piston 8
1 moves upward in FIG. 1 against the force of the spring 9, and the volume of the pressure measuring gas chamber 11 decreases accordingly, so that the pressure increases.

At the bottom of the main body 6, a pressure sensor 12 is mounted. The pressure sensor 12 has a semiconductor strain gauge connected to a bridge formed on a diaphragm as a pressure receiving portion.
1 and outputs an electric signal Vout of a voltage proportional to the gas pressure of the gas chamber 11 for pressure measurement. 1
3 is a switching signal S from the pressure change detecting means 22 (described later).
1 is an electromagnetic valve that controls opening and closing of communication between the container 1 and the gas chamber 11 for pressure measurement. In addition, the gas chamber 11 for pressure measurement
Is connected to the container 1 via the electromagnetic valve 13.

Reference numeral 21 denotes an electric signal V from the pressure sensor 12.
It is a signal processing unit that amplifies out, performs voltage / current conversion, and detects pressure. Reference numeral 22 denotes a pressure change detecting means for calculating a minute pressure change value from the difference between the normal pressure and the test pressure. 23 is a pressure change display means for displaying a minute pressure change value. 24
Is a gas density conversion means having a built-in program for calculating a gas pressure converted to a gas temperature of 20 ° C.
2 and the gas temperature detected by the gas temperature detecting means 3 are input. Reference numeral 25 denotes gas density display means for displaying the gas density converted by the gas density conversion means 24 in numerical values.

Next, the operation will be described. At a predetermined time, for example, once a day, the gas pressure in the container 1 is measured.
Electric signal Vo of the pressure sensor 12 at a predetermined gas pressure
The magnitude of ut is V0. This electric signal Vout = V
0 is amplified and converted into a voltage / current by the signal processing means 21 to calculate a normal pressure Pout = P0.
And store it.

After a predetermined time, as shown in FIG.
Then, the switching signal S1 is output from the pressure change detecting means 22 to close the electromagnetic valve 13 so that the gas in the pressure measuring gas chamber 11 does not leak into the container 1. After the solenoid valve 13 is closed, a switching signal S2 is issued from the pressure change detecting means 22 for a time T from time t2 to t3, and a solenoid current J1 flows to the solenoid 9 as shown in FIG. Then
The piston 8a is pushed upward in FIG. 1 and the volume Q0 of the gas chamber 11 for pressure measurement is reduced by a predetermined amount ΔQ1 to reduce the volume Q1.
Therefore, the pressure of the pressure measurement gas chamber 11 becomes a slight pressure Δ
It rises by P1.

At this time, the output of the pressure sensor 12 changes by a voltage ΔV1 corresponding to the minute pressure change value ΔP1, and an electric signal Vout of magnitude V1 = V0 + ΔV1 is output to the signal processing means 21. This electric signal Vout = V1 is
As shown in FIG. 2 (c), the test pressure P1 =
The test pressure P1 is converted to P0 + ΔP1, and is output to the pressure change detecting means 22.

The pressure change detecting means 22 includes the signal processing means 2
Test pressure P, which is the pressure signal Pout input via
From 1 and the previously stored normal pressure P0, a minute pressure change value, P1-P0 = (P0 + [Delta] P1)-(P0) = [Delta] P1, is calculated and displayed on the pressure change display means 23 by numbers.

When the measurement is completed, the switching signal S2 is eliminated at time t3, and the piston 8a is returned to the original position by the restoring force of the spring 9, and further at time t4, the solenoid valve 13 is turned on.
Open to return to normal pressure measurement.

As described above, the normal pressure P0 and the test pressure P1
From the pressure sensor 12 to calculate the minute pressure change value ΔP1.
By confirming that the pressure sensor 12 can detect a slight change in pressure, the soundness of the pressure sensor 12 can be confirmed.

Further, the gas density converting means 24 converts the gas temperature detected by the gas temperature detecting means 3 and the minute pressure change value ΔP1 outputted from the pressure change detecting means 22 into a minute gas density change converted into a gas temperature of 20 ° C. The amount ΔD1 is calculated, and the value is displayed by the gas density display means 25.
This makes it possible to confirm that the minute gas density change amount ΔD1 can be detected from the minute gas density change amount ΔD1, so that the soundness of the entire gas density detection device including the gas pressure detection device can be confirmed.

In the embodiment of FIG. 1,
Although the piston 8a is extruded upward in FIG. 1 and the volume of the pressure measuring gas chamber 11 is reduced, the piston 8a is pulled downward in FIG. 1 and the volume of the pressure measuring gas chamber 11 is increased. You may do so.

An error ΔE = (FG) / G is obtained, where F is the pressure change value detected by the pressure change detecting means 22, and G is the theoretical value of the change pressure of the measurement gas chamber 11. If ΔE deviates from a predetermined range, an error determination unit that warns that the error is large may be provided to automate the soundness check.

Embodiment 2 3 and 4 show another embodiment of the present invention. FIG. 3 is a configuration diagram of a gas density detecting device, and FIG. 4 is an explanatory diagram for explaining an operation.
Reference numeral 15 denotes a timer as test pressure generation instructing means for outputting the switching signals S3, S4 and S5.

Next, the operation will be described. Normal pressure Po
The detection method of ut is the same as that of the embodiment of FIG. 1. First, the switching signal S3 is output from the timer 15, and at time t1, the electromagnetic valve 13 is closed as shown in FIG. The gas in 11 is prevented from leaking into the container 1.

After the solenoid valve 13 is closed, at time t2, the switching signal S is sent from the timer 15 to the pressure change detecting means 22.
4 as well as another switching signal S5 to
As shown in (b), during the time T until time t3, the solenoid 9
The solenoid current J1 flows. Then, the piston 8a is pushed in the direction of the main body 6, and the pressure in the pressure measurement gas chamber 11 increases by a small value ΔP1.

At this time, the output of the pressure sensor 12 changes by the voltage ΔV1 corresponding to the minute pressure change value ΔP1, and the electric signal Vout of magnitude V1 = V0 + ΔV1 is output to the signal processing means 21. The electric signal V1 is converted into the pressure Pout by the signal processing unit 21 as shown in FIG. 4D, and is output to the pressure change detection unit 22 as the test pressure P1 = P0 + ΔP1 and stored. The pressure change detecting means 22 calculates P1-P0 = (P0 + [Delta] P1) -P0 = [Delta] P1 from the previously stored normal pressure P0 and the current test pressure P1 to calculate the minute pressure change value [Delta] P1.

As described above, the normal pressure P0 and the test pressure P1
From the pressure sensor 12 to calculate the minute pressure change value ΔP1.
By confirming that a small pressure change value can be detected, the soundness of the pressure sensor 12 can be confirmed.

Further, the gas density converting means 24 converts the gas temperature detected by the gas temperature detecting means 3 and the minute pressure change value ΔP1 output from the pressure change detecting means 22 into a minute gas density change converted to a gas temperature of 20 ° C. The amount ΔD1 is calculated and displayed on the gas density display means 25. Accordingly, it is possible to confirm that the gas density detecting device including the pressure sensor 12 can detect a small change amount of the gas density, so that the soundness of the gas density detecting device can be confirmed.

Embodiment 3 FIG. 5 and 6 show still another embodiment of the present invention. FIG. 5 is a configuration diagram of a gas density detecting device, and FIG. 6 is an explanatory diagram for explaining an operation. In FIG. 5, reference numeral 30 denotes a measurement auxiliary device, which has a cylindrical main body 6 and a volume variable section 31 provided integrally with the side wall. The variable volume section 31 includes a piston chamber 8 whose volume is changed by the piston 8a, the manual rod 3
2, composed of a spring 33, a sensor 34, and a push button switch 35. The pressure measurement gas chamber 11 has a main body 6 and a piston chamber 8, and is the same as that in FIG.

The manual rod 32 is fixed to the piston 8a, and when the flange 32a provided at the intermediate portion of the manual rod 32 comes into contact with the sensor 34, a switching signal S7 is output to the pressure change detecting means 22. The spring 33 is for returning to the home position when the manual rod 32 is not pushed. The push button switch 35 pressed by the manual rod 32 outputs a switching signal S8 for switching the solenoid valve 13 to the pressure change detecting means 22.

Next, the operation will be described. Normal pressure P0
Is the same as in the embodiment of FIG. When the piston 8a is pushed upward through the manual rod 32, the push button switch 35 is pushed, and the switching signal S8 is output to the pressure change detecting means 22. The switching signal S8 passes through the pressure change detecting means 22 and becomes the switching signal S1 as the switching signal S1.
As shown in FIG. 6A, the solenoid valve 13 is closed at time t1 to prevent the gas in the pressure measurement gas chamber 11 from leaking into the container 1. Further, after the solenoid valve 13 is closed, as shown in FIG. 6B, at time t2, the manual rod 32 is pushed to bring the flange 32a into contact with the sensor 34,
The button is kept pressed until time T elapses until time t3. During this time T, the switching signal S7 is output from the sensor 34 to the pressure change detecting means 22.

At this time, the piston 8a connected to the manual rod 32 is pushed upward in FIG.
1 and the pressure changes by a small value ΔP1. The electric signal Vout increases by a voltage ΔV1 corresponding to the minute pressure change value ΔP1, and becomes V1 = V0 + ΔV1, and is output to the signal processing means 21. The electric signal V1 is
As shown in FIG. 6 (c), the test pressure P1 = P
It is calculated as 0 + ΔP1 and output to the pressure change detecting means 22.

The pressure change detecting means 22 calculates P1−P0 = (P0 + ΔP1) −P0 = ΔP1 based on the previously stored normal pressure P0 and the pressure signal Pout input through the signal processing means 21. Thus, a small pressure change value ΔP1 is set.

As described above, the normal pressure P0 and the test pressure P1
From the pressure sensor 12 to calculate the minute pressure change value ΔP1.
Can confirm that a minute change in pressure can be detected, so that the soundness of the pressure sensor 12 can be confirmed.

Embodiment 4 FIG. 7 to 9 show still another embodiment of the present invention. FIG. 7 is a configuration diagram of a gas density monitoring device, and FIGS. 8 and 9 are explanatory diagrams for explaining the operation. In FIG. 7, reference numeral 42 denotes a detection characteristic detecting means, which is a normal pressure P0 and test pressures P1, P2 at two measurement points.
From P2, the detection characteristic of the pressure sensor 12 is calculated. 4
Reference numeral 3 denotes detection characteristic output means for displaying the detection characteristics of the pressure sensor 12. 44 is a gas density conversion means, and 45 is a gas density display means.

Reference numeral 46 denotes an alarm device as an alarming means. When the gas density calculated by the gas density converting means 44 is equal to or lower than a predetermined value, there is a high possibility that the gas in the container 1 is leaking. Blinks the lamp and sounds a buzzer to notify.

Next, the operation will be described. Normal pressure P0
Is the same as in the embodiment of FIG. Time t
1, the switching signal S11
Is output, the electromagnetic valve 13 is closed as shown in FIG. 8A, and the gas in the pressure measurement gas chamber 11 is prevented from leaking into the container 1.

After the solenoid valve 13 is closed, as shown in FIG. 8 (b), the switching signal S12 is output from the detection characteristic detecting means 42 to the solenoid 9 for the time T2 from time t2 to t3.
When the solenoid current J2 flows, the piston 8a is pushed upward in FIG. 7 by a stroke corresponding to the solenoid current J2, and the pressure of the measurement gas chamber 11 becomes a small value ΔP2.
Just rise.

At this time, the output of the pressure sensor 12 changes by a voltage ΔV2 corresponding to the minute pressure change value ΔP2, and V2 = V0 + ΔV2 is used as the electric signal Vout by the signal processing means 2.
1 is output. The signal processing means 21 outputs the pressure signal Vou
The test pressure P2 = P0 + ΔP2 is calculated from t. The detection characteristic detecting means 42 calculates a minute pressure change value ΔP2 from the previously stored normal pressure P0 and the current test pressure P2.

Next, as the switching signal S12 from the detection characteristic detecting means 42, when the solenoid current J3 flows to the solenoid 9 during the time T3 from time t21 to t31 in FIG. 7, the pressure of the gas chamber 11 for pressure measurement is increased by a slightly smaller pressure change value ΔP3 than in the normal state P0. At this time, the minute pressure change value ΔP3
The output of the pressure sensor 12 increases by the voltage ΔV3 corresponding to the following equation, and V3 = V0 + ΔV3 as the electric signal Vout.
Is output to the signal processing means 21.

The signal processing means 21 calculates the corresponding test pressure P3 = P0 + ΔP3 from the input electric signal V3 and outputs it to the detection characteristic detecting means 42. As shown in FIG. 9, the detection characteristic detecting means 42 calculates the input solenoid currents J2, J3 and the gas pressures P0, P2 from the previously stored normal pressure P0 and the previous and current test pressures P2, P3.
= P0 + ΔP2, P3 = P0 + ΔP3, a straight line A of the gas pressure P with respect to the solenoid current J is calculated.

Then, the result is displayed by the detection characteristic display means 43 as shown by a straight line A in FIG. At this time, a reference straight line representing the normal relationship of the gas pressure P with respect to the solenoid current J is displayed as shown by a dotted line B in FIG. Whether the characteristics are normal or not can be immediately determined. It should be noted that the straight line A and the reference straight line B are respectively expressed by mathematical formulas,
By comparing the two numerically, the detection characteristics can be determined.

Further, the gas density conversion unit 44 converts the gas temperature detected by the gas temperature detection unit 3 and the normal pressure P0 and the test pressures P2 and P3 from the detection characteristic detection unit 22 into a gas temperature converted to 20 ° C. The linearity of the density detection is calculated, and the gas density display means 45 superimposes the gas density detection characteristic calculated by the same method as the detection characteristic display means 43 on the characteristic of the original solenoid current and gas density. . When the gas density at the normal pressure P0 is equal to or less than a predetermined value, the alarm device 46 flashes a red lamp and sounds a buzzer to give an alarm.

As described above, the normal pressure P0 and the test pressure P
2 and P3, the linearity, which is the detection characteristic of the pressure sensor 12, can be confirmed, so that the detection characteristic of the pressure sensor 12 can be inspected. Further, the detection characteristics of the gas density detection device can be inspected from the linearity of the gas density detection device including the detection characteristics of the pressure sensor 12.

In the fourth embodiment, the case where the test pressure is detected at two points P2 and P3, which are higher than the normal pressure P0, has been described. However, three or more test pressures may be detected. Good. Further, two points may be selected as the test pressure, such as a pressure P2 = (P0−ΔP1) lower than the normal pressure P0 and a higher pressure P3 = (P0 + ΔP1).

In each of the above embodiments, the case where the volume of the pressure measurement gas chamber 11 is changed by the piston 8a has been described, but a cylindrical bellows is provided in the main body 6 instead of the piston chamber 8. The volume of the pressure measurement gas chamber 11 can be changed by expanding or contracting the envelope bag in the axial direction or by expanding or compressing the envelope bag while controlling the volume.

Embodiment 5 FIG. 10 is a configuration diagram of a gas density measuring device showing still another embodiment of the present invention. In FIG. 10, reference numeral 50 denotes a measurement auxiliary device, and a plurality of cylindrical body portions 6 and a plurality of gas cylinders 54 as a gas pressure changing device communicated with the cylindrical portion 6 through a main valve 52 and a manual valve 53, for example, Ten (only three shown) are provided. Each of the ten gas cylinders 54 has a volume that is 1/10 of the volume of the pressure measurement gas chamber 51.
A gas having a pressure of 6 kgf / cm × cm is filled. This pressure is about twice the pressure of the gas filled in the container 1. In this case, the pressure measurement gas chamber 51 formed by the main body 6 has a constant volume and does not change.

In such a gas density measuring apparatus, at a predetermined time, similarly to the embodiment of FIG.
Measure 0. Next, the switching signal S1 is output from the pressure change detecting means 22 to close the solenoid valve 13 so that the gas in the pressure measuring gas chamber 51 does not leak into the container 1. Further, one of the gas cylinders 54 opens the manual valve 53 to communicate with the gas chamber 51 for pressure measurement. Thereby, the pressure of the pressure measurement gas chamber 51 increases. The soundness of the pressure sensor 12 can be confirmed by comparing the measured value of the pressure increase by the pressure sensor 12 with the theoretical value calculated.

Subsequently, by supplying the gas from the second gas cylinder 54, the gas pressure in the pressure measuring gas chamber 51 further increases, so that the same method as that shown in the embodiment of FIG. 7 is used. Thus, the detection characteristics of the pressure sensor 12 can be seen.

When the gas cylinder 54 has been used up, it is replaced with a new gas cylinder. After the test,
Although the solenoid valve 13 is opened and a small amount of gas flows into the container 1 from the pressure measuring gas chamber 51, the amount is small and there is no problem. Also, a combination of a vacuum cylinder and a gas-filled cylinder may be used to balance gas supply and discharge.

As described above, if the pressure measuring gas chamber 11 or the pressure measuring gas chamber 51 having a smaller capacity than the container 1 is provided to change the volume or gas amount, a small device The pressure can be changed by supplying and discharging a small amount of gas, the operation is easy, and the apparatus is inexpensive.

For example, when the volume of the container 1 is relatively small, the pressure measurement gas chamber is not provided directly.
The pressure of the container 1 may be changed. In order to change the pressure of the container 1, a somewhat large piston chamber is directly connected to the container 1, or a gas cylinder is combined with a evacuated cylinder to directly supply and discharge gas to and from the container 1, and a metering pump. The gas may be supplied and exhausted by the above method.

[0059]

Since the present invention is configured as described above, it has the following effects. That is, in the method for diagnosing soundness of a gas pressure detecting device of the present invention, a first gas pressure measuring step of detecting a gas pressure in a container in which a gas is sealed and in which a charging section is stored as a first pressure signal by a pressure sensor A second gas pressure measuring step of changing the gas pressure in the container by a predetermined value and detecting the gas pressure as a second pressure signal by a pressure sensor; and a pressure sensor based on the first and second pressure signals. And a soundness diagnosing step of diagnosing the soundness of the pressure sensor by changing the gas pressure in the container by a predetermined value and comparing the value with the value detected by the pressure sensor to diagnose the soundness of the pressure sensor. Can be.

In the first gas pressure measuring step, the gas pressure of the pressure measuring gas chamber connected to the container is detected by a pressure sensor as a first pressure signal, and in the second gas pressure measuring step, A communication disconnection step of interrupting the communication between the pressure measurement gas chamber and the container, and changing the volume of the pressure measurement gas chamber that has interrupted the communication with the container by a predetermined amount to reduce the pressure of the pressure measurement gas chamber by a predetermined value. Since the pressure sensor has a pressure change step of changing the gas pressure of the pressure measurement gas chamber as a second pressure signal by a pressure sensor, the volume of the pressure measurement gas chamber is reduced to the volume of the container. Since the pressure is small, the pressure can be easily changed, and the diagnostic work is also easy.

Further, the gas pressure detecting device according to the present invention comprises: a pressure sensor for detecting a gas pressure in a container in which gas is sealed and containing a charging section as a pressure signal; and a gas sensor for changing the gas pressure in the container by a predetermined value. Diagnose the soundness of the pressure sensor based on the first pressure signal at a predetermined time detected by the pressure change device and the pressure sensor and the second pressure signal when the gas pressure in the container is changed by a predetermined value. And a gas pressure in the container is changed by a predetermined value, and this value is compared with a value detected by the pressure sensor to diagnose the soundness of the pressure sensor. .

Further, an on-off valve connected to the container and a measuring auxiliary device having a gas chamber for pressure measurement communicated with the container via the on-off valve are provided, and the pressure sensor is used to control the gas pressure in the gas chamber for pressure measurement. The first pressure signal at a predetermined time detected by the pressure sensor and the gas in the pressure measurement gas chamber in a state in which the communication with the container is shut off by closing the on-off valve and the soundness diagnosis means shall be detected as a pressure signal. Since the soundness of the pressure sensor is diagnosed based on the second pressure signal when the pressure is changed by a predetermined value, the volume of the pressure measurement gas chamber is smaller than the volume of the container. Thus, the pressure can be easily changed, and the diagnosis time can be shortened.

Then, the measuring auxiliary device is made to be capable of changing the volume of the pressure measuring gas chamber, and the soundness diagnosing means is operated by closing the first pressure signal detected by the pressure sensor at a predetermined time and the on-off valve. A second pressure signal when the gas pressure in the gas chamber for pressure measurement is changed by a predetermined value by interrupting communication with the container and changing the volume of the gas chamber for pressure measurement by a predetermined amount, and Since the soundness is diagnosed, the volume of the pressure measurement gas chamber is changed by a predetermined amount, and the gas pressure of the pressure measurement gas chamber is changed by a predetermined value. The soundness of the pressure sensor can be diagnosed by comparing the detected value with the detected value.

Further, the soundness diagnosing means is provided with characteristic calculating means for changing the pressure of the gas chamber for pressure measurement by first and second predetermined values and calculating the detection characteristic of the pressure sensor based on each pressure signal at this time. Thus, the detection characteristics of the pressure sensor can be known from the pressure signal of the pressure sensor at that time by changing the volume of the pressure measurement gas chamber by the first and second predetermined amounts.

Further, the test pressure generation instructing means and the volume control means for changing the volume of the pressure measuring gas chamber by a predetermined amount in accordance with the instruction signal of the test pressure generation instructing means are provided. The pressure is changed by changing the volume of the pressure measurement gas chamber by a predetermined amount by the generation instruction means, and this can be detected as a second pressure signal.

A supply / discharge device for supplying / discharging gas to / from the pressure measurement gas chamber of the measurement auxiliary device is provided, and the soundness diagnosis means is used to close the first pressure signal detected by the pressure sensor at a predetermined time and the on / off valve. The gas pressure in the gas chamber for pressure measurement is changed by a predetermined value by shutting off communication with the container and supplying or discharging gas from the gas chamber for pressure measurement by the supply / discharge device. It is characterized by diagnosing the soundness of the pressure sensor based on the second pressure signal at the time of It can be detected as a second detection signal. Further, since the volume of the pressure measurement gas chamber is smaller than the volume of the container, the pressure can be easily changed.

Further, the gas density detecting device of the present invention comprises any one of the gas pressure detecting devices described above, a temperature detecting means for detecting the gas temperature in the container as a temperature signal, and a gas pressure and gas temperature. Gas density calculation means for calculating gas density, so when detecting the gas density from the gas pressure and temperature, check the soundness of the gas pressure detection device to detect the gas pressure, gas The soundness of the density detector can be confirmed.

Further, the gas density monitoring device of the present invention is provided with the above-described gas density detection device and a notifying means for notifying when the calculated gas density is below a predetermined value. When the density is low, this can be reliably detected and an abnormality can be known.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a gas density detection device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining an operation of the gas tightness detection device of FIG. 1;

FIG. 3 is a configuration diagram of a gas density detection device showing another embodiment of the present invention.

FIG. 4 is an explanatory diagram for explaining an operation of the gas tightness detection device of FIG. 3;

FIG. 5 is a configuration diagram of a gas density detection device showing another embodiment of the present invention.

FIG. 6 is an explanatory diagram for explaining an operation of the gas tightness detection device of FIG. 5;

FIG. 7 is a configuration diagram of a gas density monitoring device according to another embodiment of the present invention.

FIG. 8 is an explanatory diagram for explaining an operation of the gas density monitoring device of FIG. 7;

FIG. 9 is an explanatory diagram for explaining an operation of the gas density monitoring device of FIG. 7;

FIG. 10 is a configuration diagram of a gas density detection device showing another embodiment of the present invention.

FIG. 11 is a configuration diagram showing a conventional gas density detection device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 container, 1a three-phase collective bus, 3 gas temperature detecting means, 5 measurement auxiliary device, 6 main body, 8 piston chamber, 8a piston, 11 pressure measurement gas chamber, 12
Pressure sensor, 13 solenoid valve, 15 timer, 21 signal processing means, 22 pressure change detection means, 24 gas density conversion means, 30 measurement auxiliary device, 32 manual rod, 42
Detection characteristic detecting means, 44 gas density converting means, 46
Alarm device, 50 Measurement auxiliary device, 51 Gas chamber for pressure measurement, 53 Manual valve, 54 Gas cylinder.

Claims (10)

[Claims] A first gas pressure measuring step of detecting, as a first pressure signal, a gas pressure in a container containing a charged part and containing a charged portion by a pressure sensor, and measuring the gas pressure in the container at a predetermined value. A second gas pressure measuring step of detecting the gas pressure as a second pressure signal by the pressure sensor by only changing the pressure, and a soundness of diagnosing the soundness of the pressure sensor from the first and second pressure signals. A diagnosis step, comprising: a method of diagnosing the soundness of the gas pressure detection device, comprising: 2. The first gas pressure measuring step is to detect a gas pressure of a pressure measuring gas chamber connected to the container as a first pressure signal by a pressure sensor, and the second gas pressure measuring step is A communication disconnection step of interrupting communication between the pressure measurement gas chamber and the container, and changing the volume of the pressure measurement gas chamber by interrupting the communication with the container by a predetermined amount, thereby setting the pressure of the pressure measurement gas chamber to a predetermined value. 2. The gas pressure detecting device according to claim 1, further comprising a pressure changing step of changing the pressure value by the pressure sensor and detecting a gas pressure of the pressure measuring gas chamber as a second pressure signal by a pressure sensor. Health diagnosis method. 3. A pressure sensor for detecting, as a pressure signal, a gas pressure in a container in which gas is sealed and in which a charging section is stored, a gas pressure changing device for changing the gas pressure in the container by a predetermined value, and the pressure sensor Soundness diagnosis means for diagnosing the soundness of the pressure sensor based on a first pressure signal at a predetermined time detected by the first pressure signal and a second pressure signal when the gas pressure in the container is changed by a predetermined value. , A gas pressure detection device. 4. An on-off valve connected to a container, and a measurement auxiliary device having a gas chamber for pressure measurement communicated with the container via the on-off valve, wherein a pressure sensor is connected to the gas pressure of the gas chamber for pressure measurement. As a pressure signal, and the soundness diagnosis means is configured to close the first pressure signal at a predetermined time detected by the pressure sensor and the pressure measurement gas in a state in which the on-off valve is closed and communication with the container is cut off. 4. The gas pressure detecting device according to claim 3, wherein the soundness of the pressure sensor is diagnosed based on the second pressure signal when the gas pressure in the chamber is changed by a predetermined value. 5. A measuring auxiliary device capable of changing the volume of a pressure measuring gas chamber, and a soundness diagnosing means for closing a first pressure signal detected by a pressure sensor at a predetermined time and an on-off valve. The pressure sensor based on a second pressure signal when the gas pressure in the gas chamber for pressure measurement is changed by a predetermined value by interrupting communication with the container and changing the volume of the gas chamber for pressure measurement by a predetermined amount. The gas pressure detecting device according to claim 4, wherein the soundness of said gas is diagnosed. 6. A soundness diagnosing means provided with a characteristic calculating means for changing the pressure of the pressure measuring gas chamber by first and second predetermined values and calculating a detection characteristic of the pressure sensor based on each pressure signal at this time. The gas pressure detecting device according to claim 5, wherein 7. The test pressure generating means according to claim 5, further comprising a test pressure generation instructing means, and a volume control means for changing a volume of the pressure measuring gas chamber by a predetermined amount according to an instruction signal of the test pressure generating instructing means. Gas pressure detector. 8. A gas supply / discharge device for supplying / discharging gas to / from a pressure measurement gas chamber of the measurement auxiliary device, wherein the soundness diagnostic means closes a first pressure signal at a predetermined time detected by a pressure sensor and an on-off valve. The gas pressure in the gas chamber for pressure measurement is changed by a predetermined value by shutting off the communication with the container and supplying gas to or discharging gas from the gas chamber for pressure measurement by the supply / discharge device. The gas pressure detecting device according to claim 4, wherein the soundness of the pressure sensor is diagnosed based on the second pressure signal when the gas pressure is detected. 9. A gas pressure detecting device according to claim 3, a temperature detecting means for detecting a gas temperature in the container as a temperature signal, and a gas from the gas pressure and the gas temperature. A gas density detection device comprising: gas density calculation means for calculating a density. 10. A gas density monitoring apparatus according to claim 9, further comprising: a notifying means for notifying when the calculated gas density is equal to or less than a predetermined value.