JP2001228922A - Pressure control device - Google Patents

Abstract

(57) [Summary] An object of the present invention is to be able to automatically change a set pressure according to a change in gas consumption. A pressure control device includes a pressure control valve.
, A pilot valve 16 and a pressure setting unit 17.
In the memory of the control circuit 18, chart patterns A to F are stored as pressure control data for changing the set pressure value Ps according to a change in the gas usage amount during the season (month and day). In each of the chart patterns A to F, the supply pressure is controlled by a different control pattern, so that fine pressure control can be performed in accordance with the seasonal temperature change and time zone. Accordingly, the control circuit 18 selects a chart pattern corresponding to the current date, and drives and controls the pressure setting unit 17, as the secondary pressure P ₂ becomes the set pressure on the basis of the chart pattern selected The pilot pressure of the pilot valve 16 is adjusted to automatically correct the pressure controlled by the pressure control valve 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure control apparatus, and more particularly, to a pilot pressure adjusted by a pressure setting section, which is supplied to a driving section of a pressure control valve so that a secondary pressure supplied downstream is equal to a set pressure. The present invention relates to a pressure control device for controlling a valve opening of a pressure control valve so as to be controlled.

[0002]

2. Description of the Related Art For example, in a pressure control device installed in a line for supplying city gas, a diaphragm that operates using pressure is employed as a drive unit of the pressure control valve, and a pilot valve is operated by the pressure control device. The pressure (secondary pressure) on the downstream side of the pressure control valve in the gas supply line is set by adjusting the pilot pressure (control pressure) supplied from the pilot valve to the diaphragm chamber of the pressure control valve by operating the valve section of The pressure value (target pressure) is set.

A pressure control device of this type includes, for example, a pressure control valve for controlling a secondary pressure of a gas supplied to a downstream pipe, and a pilot valve for adjusting a control pressure supplied to an actuator of the pressure control valve. And a pressure setting device that operates the valve portion of the pilot valve so that the secondary pressure becomes a predetermined set pressure value.

[0004] In a city gas supply line, the gas consumption varies depending on the season (for example, the gas consumption in the high temperature summer is low, and the gas consumption in the low temperature winter increases), and the daily gas consumption increases. The gas consumption varies depending on the time zone (for example, in the daytime and late at night, the gas consumption increases in the daytime). Therefore, the above-described pressure control device is buried together with the gas pipe in the medium-pressure pipe that supplies gas to a certain area. Therefore, an operator who performs maintenance of the pressure control device periodically adjusts the set value of the gas supply pressure (secondary pressure) according to the increase or decrease of the gas consumption on the downstream side.

For example, the operation of adjusting the set value of the gas supply pressure (secondary pressure) is performed by a pressure setting change operation of a pressure setting device. That is, the pressure setting change operation by the pressure setting device is performed by manually adjusting the rotation of the adjusting screw, adjusting the compression allowance of the coil spring pressing the diaphragm that controls the pilot pressure, and changing the spring constant to change the pilot pressure. And the set pressure value was changed.

The pressure setting device is provided with a potentiometer for detecting the amount of rotation of an adjustment shaft for adjusting the compression allowance of the coil spring. This potentiometer changes the resistance value according to the amount of rotation of the adjustment shaft. Further, the resistance value of the potentiometer is set to be proportional to the secondary pressure controlled by the pressure control valve. Therefore, the operator who sets the pressure adjusts the rotation amount of the adjustment shaft while observing the change in the resistance value detected by the potentiometer, that is, the change in the set pressure value, periodically according to the change in the gas consumption. ing.

[0007]

In the above-mentioned conventional pressure control device, when the gas consumption amount fluctuates greatly, it is necessary to go to the installation site of the pressure setting device and adjust the rotation amount of the adjustment shaft. Therefore, there is a problem that not only the labor of the worker is great, but also the fine adjustment of the set pressure cannot be performed, and for example, it is not possible to cope with the fluctuation of the gas consumption according to the time of the day.

In the case where the pressure set value by the pressure setting device is automatically adjusted according to the gas consumption on the downstream side,
By detecting the secondary pressure on the downstream side and changing the pressure set value based on the detected pressure value, the pressure control value of the pressure control valve is changed. However, the secondary pressure fluctuates according to the gas consumption, and the pressure control valve fluctuates.
Since it operates to return the next pressure to the set value, if the pressure set value is changed based on the fluctuation value of the secondary pressure, the pressure set value will always fluctuate, and stable gas supply cannot be performed. There's a problem.

Therefore, an object of the present invention is to provide a pressure control device which solves the above-mentioned problem.

[0010]

In order to solve the above problems, the present invention has the following features.

The invention according to claim 1 is a pressure control valve provided in the middle of a pipe through which a fluid flows, for controlling a secondary pressure to a set pressure, and setting the pressure of the pressure control valve to a predetermined pressure. In a pressure control device including a pressure setting unit for controlling, the pressure setting unit includes a timer unit that counts a current day, a storage unit that stores a plurality of pressure control patterns including target value data of a set pressure, and the clock unit. Setting pressure changing means for reading a pressure control pattern corresponding to the date counted by the storage unit from the storage unit and changing a current set pressure based on the pressure control pattern. .

Therefore, according to the first aspect of the present invention, the pressure control pattern corresponding to the date counted by the timer is read from the storage unit, and the current set pressure is changed based on the pressure control pattern. In addition, the set pressure can be automatically changed according to the fluctuation of the gas consumption, and the supply pressure to the downstream side can always be stabilized. Further, the adjustment work of the set pressure by the manual operation of the operator becomes unnecessary, and even when the gas consumption varies depending on the time period, it is possible to cope with the fine pressure control.

According to a second aspect of the present invention, there is provided the pressure control device according to the first aspect, wherein the first display means for graphically displaying the pressure control pattern read from the storage section; Second display means for graphically displaying a change in the adjustment value adjusted by the pressure control valve.

Therefore, according to the second aspect of the present invention, since the pressure control pattern read from the storage unit and the change in the adjustment value adjusted by the pressure control valve are graphically displayed, the target pressure The change of the control pattern and the change of the controlled adjustment value can be compared, and the control results so far can be confirmed at a glance.

According to a third aspect of the present invention, there is provided the pressure control device according to the second aspect, wherein the set pressure changing means includes a target value of a pressure control pattern displayed on the first display means. And an adjustment value displayed on the second display means, and the set pressure is changed so that the adjustment value matches the target value.

Therefore, according to the third aspect of the present invention, the set pressure changing means includes the target value of the pressure control pattern displayed on the first display means and the adjustment value displayed on the second display means. And the set pressure is changed so that the adjustment value matches the target value. Therefore, the secondary pressure controlled by the pressure control valve is automatically set even if an error occurs in the pressure control pattern. The pressure can be finely adjusted to control the secondary pressure to match the pressure control pattern.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of one embodiment of a pressure control device according to the present invention.

As shown in FIG. 1, a pressure setting device 10
Is disposed between an upstream pipe 12 for supplying city gas and a downstream pipe 13.
The pressure control device 11 includes a pressure control valve 14 for controlling a secondary pressure of gas supplied to the downstream pipe 13, and a pilot valve 16 for adjusting a pilot pressure supplied to an actuator 15 of the pressure control valve 14. A pressure setting unit 17 that operates the valve unit of the pilot valve 16 so that the secondary pressure becomes a predetermined set pressure value, and a secondary pressure based on control data stored in the pressure setting unit 17 and registered in advance. And a control circuit 18 for controlling the pressure setting unit 17 so that the pressure value becomes a set pressure value for each time zone.

The pressure setting device 10 includes a pilot valve 1
6 and a pressure setting unit 17 incorporating a control circuit 18.

Actuator section 15 of pressure control valve 14
Has an upper diaphragm chamber 20 and a lower diaphragm chamber 21 defined by a diaphragm 19, and a pressure setting spring 22 for pressing the diaphragm 19 in a valve closing direction is disposed in the upper diaphragm chamber 20. I have.

The pilot valve 16 has a primary pressure introducing line 23 connected to the upstream line 12, a secondary pressure introducing line 24 connected to the downstream line 13, and a lower diaphragm chamber 21. And a secondary pressure introduction line 26 connected to the upper diaphragm chamber 20.
Is connected.

In the pilot valve 16, the amount of compression of the pressure setting spring 36 is increased or decreased by the operation of the pressure setting section 17, and the load of the pressure setting spring 36 is increased or decreased by the increase or decrease of the amount of compression. The set pressure Ps of the pilot valve 16 is determined by the load of the pressure setting spring 36 and the secondary pressure P ₂ applied to the diaphragm 32.
Becomes the secondary pressure P ₂ when the forces due to are balanced.

Therefore, the pilot valve 16 increases or decreases the set pressure Ps by increasing or decreasing the spring load of the pressure setting spring 36 by the operation of the pressure setting section 17. Here, for example, 2
When the next pressure P ₂ lower than the set pressure Ps, because the direction of the spring load of the pressure setting spring 36 is greater than the force by the secondary pressure P ₂ applied to the diaphragm 32, the diaphragm 32
Is displaced upward. As a result, the valve portion of the pilot valve 16 opens to increase the pilot pressure.

On the other hand, a pilot pressure is introduced into the lower diaphragm chamber 21 from the pilot valve 16 through a pilot pressure introduction pipe 25, and the upper diaphragm chamber 20
To the secondary pressure P ₂ via the secondary pressure introduction pipes 24 and 26.
Has been introduced. Therefore, as the pilot pressure increases, the lower diaphragm chamber 21 and the upper diaphragm chamber 20
The diaphragm 19 is displaced upward with respect to the load of the pressure setting spring 36 due to the pressure difference.

As a result, the valve portion of the pressure control valve 14 performs a valve opening operation to increase the secondary pressure P ₂ to the set pressure P ₂ . Further, when the secondary pressure P ₂ rises above the set pressure Ps, because the direction of the spring load of the pressure setting spring 36 is smaller than the force due to secondary pressure P ₂ applied to the diaphragm 32, the diaphragm 32 is displaced downward.

As a result, the valve portion of the pilot valve 16 performs a valve closing operation to lower the pilot pressure. Accordingly, the pilot pressure is reduced, and the pressure difference between the lower diaphragm chamber 21 and the upper diaphragm chamber 20 is reduced. This allows
The valve portion of the pressure control valve 14 to step down the secondary pressure P ₂ operates the valve closed to the set pressure Ps.

As described above, when the secondary pressure P ₂ fluctuates due to a change in the amount of gas used on the downstream side, the diaphragm 19 of the pressure control valve 14 is displaced as described above, and the secondary pressure P ₂ becomes the set pressure value. Pressure control is performed so as to maintain Ps.

Here, the pressure setting section 17 will be described.

FIG. 2 is an enlarged longitudinal sectional view showing the internal structure of the pressure setting device 10. As shown in FIG. FIG. 3 shows a pressure setting device 1.
0 is a side view.

As shown in FIGS. 2 and 3, the pressure setting device 10 includes a pressure setting portion 17 below the pilot valve 16.
Is detachably attached. The housing 31 of the pilot valve 16 includes an upper portion 31a, a middle portion 31b, and a lower portion 31.
and c are integrally fastened by bolts 30 in a state of being overlapped. The inside of the housing 31 is formed by an upper diaphragm 32 and a lower diaphragm 33 in the upper chamber 3.
4a, a middle chamber 34b, and a lower chamber 34c.

The lower chamber 34c is provided with a pressure setting spring 36 for pressing the lower diaphragm 33 upward. The pressure setting spring 36 has a lower end portion in contact with a disk-shaped spring receiver 37 screwed with the adjusting screw 55 and an upper end portion in contact with a spring receiver 38 fixed to the lower surface of the lower diaphragm 33. The pressure setting spring 36 sets the set pressure value Ps by adjusting the spring force by a motor driving force as described later.

The housing 31 of the pilot valve 16
An explosion-proof case 46 having a pressure-resistant explosion-proof structure of the pressure setting unit 17 is detachably attached to the lower part of the pressure setting unit 17 by fastening bolts 47. This explosion-proof case 46 is used for the upper case 4
8 and the lower case 49 are combined, and are fixed to each other by fastening bolts 50.

An electric motor 51 for adjusting the spring force of the pressure setting spring 36 is provided inside the explosion-proof case 46.
A speed reducer 52 for reducing the rotation of the electric motor 51; a rotating shaft 53 to which rotation from the speed reducer 52 is transmitted;
An adjustment screw 55 coaxially connected to the upper end of the rotary shaft 53 via a coupling 54, a potentiometer 56 composed of a variable resistor for measuring the rotational position of the rotary shaft 53, and the control circuit 18 are accommodated.

FIG. 4 is a block diagram of each electronic device housed in the explosion-proof case 46.

As shown in FIG. 4, the control circuit 18
Conventionally, the explosion-proof case 46, which is the same as the electric motor 51, is provided at a location remote from the installation site.
And has a compact configuration. The control circuit 18 and the electric motor 51 are connected by a cable 72, and the control circuit 18 and the potentiometer 56 are connected by a cable 73.

The control circuit 18 includes a CPU 77 for calculating a control amount of the pressure setting section 17 and a CPU
Memory 7 setting pressure control pattern follows the pressure P ₂ is stored
8 and a clock means 80 for clocking the current time.
Further, the CPU 77 controls the driving of the electric motor 51 based on the set pressure control pattern stored in the memory 78 so that the secondary pressure P ₂ becomes a pressure corresponding to the set pressure control pattern. Further, the timer 80 has a clock program for counting time and a calendar program for counting date.

The control circuit 18 is connected to a connector 75 which is connected to an external device or a power supply. In the present embodiment, the connector 75 is provided with terminals H and G for AC 100 V, a terminal E for grounding, a terminal for alarm output, and terminals for communication.

The memory 78 has a control program for calculating a control amount of the pressure setting unit 17 based on each signal, and pressure control data for changing a set pressure value Ps according to a change in gas usage during the season (month and day). Chart patterns A to F as (rotational position of the rotary shaft 53 for adjusting the spring force of the pressure setting spring 36) are stored.

FIG. 5 is a graph showing an example of the pressure control range of the chart patterns A to F according to the season (month and day).

As shown in FIG. 5, for example, chart pattern A is from January 1 to February 20, chart pattern B is from February 21 to April 14, and chart pattern C is from April 15 Until June 8, chart pattern D
Is from June 9 to September 2, chart pattern E is 9
From March 3 to November 4, chart pattern F is 11
It is pressure control data from the 5th of the month to the 31st of December.

FIG. 6 is a graph showing an example of the pressure control according to each time zone of the chart pattern A.

As shown in FIG. 6, the chart pattern A
Means that the supply pressure (secondary pressure P ₂ ) is maintained at 1.8 kPa from 22:30 to 3:30 the next day, the supply pressure is increased stepwise after 3:30, and the supply pressure is increased at midnight. Is controlled to be lowered step by step.

In the case of the chart pattern A, for example, the supply pressure is set to 1.8 kP between 3:30 and 4:30.
a to 2.2 kPa. The supply pressure is increased from 2.2 kPa to 2.5 kPa between 6:00 and 7:00. The supply pressure is increased from 2.5 kPa to 3.0 kPa between 9:00 and 10:00.

In the case of chart pattern A, 18
Between 30:30 and 20:00, the supply pressure is reduced from 3.0 kPa to 2.5 kPa. The supply pressure was increased from 2.5 kPa to 1.8 kPa between 21:30 and 22:30.
Down.

FIG. 7 is a graph showing an example of the pressure control according to each time zone of the chart pattern D.

As shown in FIG.
Is to keep the supply pressure at 1.2 kPa from 22:30 to 3:30 on the following day, to increase the supply pressure step by step after 3:30, and to decrease the supply pressure step by step at midnight. To control.

In the case of the chart pattern D, for example, the supply pressure is set to 1.2 k between 3.30 and 4.30.
Increase from Pa to 1.5 kPa. The supply pressure is increased from 1.5 kPa to 1.8 kPa between 6:00 and 7:00. Supply pressure 1.8 kPa between 9:00 and 10:00
To 2.0 kPa.

In the case of the chart pattern D, 19
Supply pressure 2.0 kP between 1:30 and 20:30
a to 1.5 kPa. Supply pressure is increased from 1.5 kPa to 1.2 kPa between 22:00 and 22:30.
Down.

As described above, each of the chart patterns A to F
Since the supply pressure is controlled by different control patterns, fine pressure control can be performed in accordance with the temperature change and the time zone in each season. Therefore, CPU 77 selects a chart pattern corresponding to the current date, by controlling the driving of the electric motor 51 as the secondary pressure P ₂ becomes the set pressure on the basis of the chart pattern selected, 2 the following pressure P ₂ can be controlled finely in accordance with a variation in downstream gas used.

Here, control processing executed by the CPU 77 of the control circuit 18 will be described.

FIG. 8 is a flowchart of the pressure setting process executed by the CPU 77 of the control circuit 18.

As shown in FIG. 8, the CPU 77 reads the current date from the timer 80 in step S11 (hereinafter, "step" is omitted).

In the next S12, the current date is from January 1st.
It is determined whether or not it is during February 20. S12
If the current date falls between January 1 and February 20, the process proceeds to S13 and selects the chart pattern A.

If it is determined in S12 that the current date does not fall between January 1 and February 20, the process proceeds to S14, and the current date falls between February 21 and April 14. It is determined whether or not it is in the middle. In S14, if the current date falls between February 21 and April 14,
Proceeding to 15, the chart pattern B is selected.

If it is determined in S14 that the current date is not between February 21 and April 14, the process proceeds to S16.
To determine whether the current date falls between April 15 and June 8. In S16, if the current date falls between April 15 and June 8, S1
Proceed to 7 to select the chart pattern C.

If it is determined in S16 that the current date is not between April 15 and June 8, the process proceeds to S18, and the current date is changed from June 9 to September 2. It is determined whether or not it is in the middle. In S18, the current date is 6
If the date falls between 9th and 9th September, the process proceeds to S19, and the chart pattern D is selected.

If it is determined in S18 that the current date does not fall between June 9 and September 2, the process proceeds to S20, and the current date falls between September 3 and November 4. It is determined whether or not it is in the middle. In S20, the current date is 9
If the month is between 3rd and 4th of November, the process proceeds to S21, and the chart pattern E is selected.

If it is determined in S20 that the current date is not between September 3 and November 4, the process proceeds to S22, and the current date is changed from November 5 to December 31. It is determined whether or not it is in the middle. In S22, if the current date falls between November 5 and December 31, the process proceeds to S23, where a chart pattern F is selected.

In S22, the current date is 11
If the month does not fall between the 5th and the 31st of December, the process returns to S11 and the processes of S11 to S22 are repeated.

In S24, the pressure setting data of the selected chart pattern is read. In the next step S25, the current time is read from the timer 80.

Then, the program proceeds to S26, in which pressure setting data at the current time is extracted from the selected chart pattern.
Then, in S27, the electric motor 51 is drive-controlled based on the extracted pressure setting data at the current time. Thus, the electric motor 51 drives the adjustment screw 55 to rotate, moves the spring receiver 37 in the axial direction according to the rotation amount of the adjustment screw 55, and changes the spring load of the pressure setting spring 36. As a result, the pilot valve 16 is
The set pressure Ps is increased / decreased by increasing / decreasing the spring load of the pressure setting spring 36 by the operation of (1).

In the next S28, it is checked whether or not the period of the selected chart pattern has ended. If the period of the chart pattern has not ended in S28, the process returns to S25, and the processing from S25 is repeated. However, if the period of the chart pattern has ended in S28, the current process ends and the process returns to S11.

Next, a modification of the present invention will be described.

FIG. 9 is a block diagram of a modification of the present invention.

As shown in FIG. 9, the pressure control device 11
Has a pressure setting device 10 and a pressure control valve 14 disposed between an upstream pipe 12 and a downstream pipe 13 for supplying city gas.

The pressure setting device 10 includes a pilot valve 1
6 and a pressure setting unit 17. The pressure setting unit 17 includes an electric motor 51 for adjusting the spring force of the pressure setting spring 36, a potentiometer 56 including a variable resistor for measuring the rotational position of the rotating shaft 53, and a preset pressure control pattern. Motor 51 based on
And a control circuit 18 for controlling the operation of the control circuit. Control circuit 18
Includes a CPU 77, a memory 78, a timer 80,
A communication driver 82 for communicating with the outside is provided.

At the time of periodic inspection, the worker connects, for example, a notebook personal computer 84 to a communication driver 82 via a cable 86. In the notebook personal computer 84, a display device 84b composed of a liquid crystal display or the like is provided at the rear part of a main body 84a on which a keyboard and a magnetic disk device are mounted so as to be opened and closed.

The memory 78 has a control program for calculating a control amount of the pressure setting section 17 based on each signal,
Set pressure value Ps corresponding to seasonal (Monday) gas usage change
Are stored as pressure control data (rotational position of the rotary shaft 53 for adjusting the spring force of the pressure setting spring 36).

Further, in the memory 78, a display program (first display means) for graphically displaying the current chart pattern (pressure control pattern) and a change in the adjustment value adjusted by the pressure control valve 14 are graphically displayed. A display program (second display means) is compared with a displayed pressure control pattern graph and an adjustment value graph, and the set pressure control program (changes the set pressure so that the adjustment value matches the pressure control pattern) (Set pressure changing means).

FIG. 10 is a graph showing an example of a chart pattern displayed on the display device 84b.

As shown in FIG. 10, the pressure setting device 1
The notebook personal computer 84 connected to the communication driver 82 of No. 0 can display the chart pattern selected at that time on the display device 84b as the graph I by outputting the communication request signal of the keyboard. Therefore, the worker performing the periodic inspection can check the current control pattern while viewing the graph I of the chart pattern displayed on the display device 84b of the notebook personal computer 84.

FIG. 11 is a graph showing an example of a state where the current chart pattern and the pressure value controlled by the pressure control valve 14 are displayed on the display device 84b.

As shown in FIG. 11, the display device 84b of the notebook personal computer 84 displays a graph I of the currently selected chart pattern and a graph II of the pressure value controlled by the pressure control valve 14. Displayed at the same time. Note that the graph II is created based on the detection signal output from the potentiometer 56.

The notebook personal computer 8
4 is displayed on the display device 84b.
And the graph II of the pressure value actually supplied to the downstream side of the pressure control valve 14 are displayed in an overlapping state, and the graph II
Is displayed as a line (or another color) thicker than the graph I. Therefore, the worker performing the periodic inspection can recognize the change of the actual pressure with respect to the set value, easily compare the graph I with the graph II, and easily check whether there is an error in the control pressure value with respect to the set value. Can be.

Here, a modified control process executed by the CPU 77 of the control circuit 18 will be described.

FIG. 12 is a flowchart of a control process according to a modification executed by the CPU 77 of the control circuit 18.

As shown in FIG. 12, the CPU 77
In S31, it is checked whether or not there is a request for control data from the notebook personal computer 84 connected to the communication driver 82.

In S31, when a request for control data is made from the notebook personal computer 84,
Proceeding to 32, the control data of the currently selected chart pattern is read from the memory 78. Subsequently, in S33, the control data of the chart pattern is transmitted to the communication driver 82.
To the notebook personal computer 84, and the display device 84b displays the graph I of the currently selected chart pattern.

In the next step S34, the control data of the supply pressure value controlled by the pressure control valve 14 is read. continue,
Proceeding to S35, a graph II of the supply pressure value controlled by the pressure control valve 14 is displayed.

In S36, the chart pattern of the graph I is compared with the graph II of the supply pressure value to check whether they match. If the chart pattern of the graph I matches the graph II of the supply pressure value in S36,
In S37, it is determined that there is no error, and the current process ends.

However, in S36, the graph I
If the chart pattern does not match the supply pressure value graph II, the flow shifts to S38 so that the supply pressure (secondary pressure) controlled by the pressure control valve 14 matches the chart pattern and the supply pressure value. The electric motor 51 is driven, and the pilot pressure supplied from the pilot valve 16 to the pressure control valve 14 is automatically adjusted. Thereby, the supply pressure controlled by the pressure control valve 14 can be corrected to the set pressure value.

Therefore, the worker simply connects the notebook personal computer 84 to the communication driver 82,
Since the supply pressure is automatically corrected, the inspection work can be simplified and the inspection time can be greatly reduced.

In the above embodiment, the case where the notebook personal computer 84 is connected to the communication driver 82 has been described. However, the present invention is not limited to this, and another type of terminal device or communication device is connected to the communication driver 82. You may do so.

Further, in the above-described embodiment, the case where the gas is provided on the line to which city gas is supplied has been described as an example. However, the present invention is not limited to this. Of course, it can be applied to

[0086]

As described above, according to the first aspect of the present invention, the pressure control pattern corresponding to the date counted by the timer is read from the storage unit, and the current set pressure is read based on the pressure control pattern. Therefore, the set pressure can be automatically changed according to the fluctuation of the gas consumption, and the supply pressure to the downstream side can always be stabilized. Further, the adjustment work of the set pressure by the manual operation of the operator becomes unnecessary, and even when the gas consumption varies depending on the time period, it is possible to cope with the fine pressure control.

According to the second aspect of the present invention, the pressure control pattern read from the storage unit and the change in the adjustment value adjusted by the pressure control valve are graphically displayed.
The change in the target pressure control pattern can be compared with the change in the controlled adjustment value, and the control results so far can be checked at a glance.

Further, according to the third aspect of the present invention, the set pressure changing means determines the target value of the pressure control pattern displayed on the first display means and the adjustment value displayed on the second display means. And the set pressure is changed so that the adjustment value matches the target value. Therefore, even if the secondary pressure controlled by the pressure control valve has an error with respect to the pressure control pattern, the set pressure is automatically set. Can be fine-tuned to control the secondary pressure to match the pressure control pattern.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a pressure control device according to the present invention.

FIG. 2 is an enlarged longitudinal sectional view showing an internal configuration of the pressure setting device 10.

3 is a side view of the pressure setting device 10. FIG.

4 is a block diagram of each electronic device housed in an explosion-proof case 46. FIG.

FIG. 5 is a chart pattern A to F according to a season (month and day).
5 is a graph showing an example of a pressure control range of FIG.

FIG. 6 is a graph showing an example of pressure control according to each time zone of chart pattern A.

FIG. 7 is a graph showing an example of pressure control according to each time zone of a chart pattern D.

FIG. 8 is a flowchart of a pressure setting process executed by a CPU 77 of the control circuit 18.

FIG. 9 is a configuration diagram of a modified example of the present invention.

FIG. 10 is a graph showing an example of a chart pattern displayed on the display device 84b.

FIG. 11 is a graph showing an example of a state in which a current chart pattern and a pressure value controlled by the pressure control valve 14 are displayed on a display device 84b.

FIG. 12 is a flowchart of a control process according to a modification performed by the CPU 77 of the control circuit 18.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pressure setting device 11 Pressure control device 12 Upstream line 13 Downstream line 14 Pressure control valve 15 Actuator part 16 Pilot valve 17 Pressure setting part 18 Control circuit 19 Diaphragm 20 Upper diaphragm chamber 21 Lower diaphragm chamber 22 Pressure setting spring 36 Pressure setting spring 51 Electric motor 55 Adjusting screw 56 Potentiometer 77 CPU 78 Memory 80 Clocking means 82 Communication driver 84 Notebook personal computer 84b Display device

Continuation of the front page (72) Inventor Yasuhiro Nakamura 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Inventor Kenji Iwao 1-6-1, Fujimi, Kawasaki-ku, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Tokiko Corporation (72) Inventor Tokuji Sugiyama 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term inside Tokiko Corporation (reference) 5H316 AA11 BB05 DD06 DD07 FF37 GG06 HH04 HH12 JJ04 JJ13 KK02

Claims (3)

[Claims] 1. A pressure control valve provided in a pipe through which a fluid flows to control a secondary pressure to a set pressure, and a pressure setting unit to control a set pressure of the pressure control valve to a predetermined pressure. In the pressure control device, the pressure setting unit includes a time counting unit that counts a current day, a storage unit that stores a plurality of pressure control patterns including target value data of a set pressure, and a date that is counted by the time counting unit. And a setting pressure changing unit that reads the pressure control pattern from the storage unit and changes the current set pressure based on the pressure control pattern. 2. The pressure control device according to claim 1, wherein first display means for graphically displaying the pressure control pattern read from the storage unit, and an adjustment value adjusted by the pressure control valve. And a second display means for graphically displaying the change of the pressure control device. 3. The pressure control device according to claim 2, wherein the set pressure change unit displays a target value of a pressure control pattern displayed on the first display unit and a target value of the pressure control pattern displayed on the second display unit. A pressure control device, wherein the set pressure is changed such that the set value is compared with the adjusted value to be adjusted and the adjusted value matches the target value.