JP2002071502A - Pressure supply system and automatic pressure controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply stable air pressure to an output part side regardless of unstable supply of air pressure. SOLUTION: In the case where a sudden high air pressure or a low air pressure extremely lacking in capacity is sent to a supply part 1 side during control with a pressure controller 11, the air pressure is taken by an accumulator 8 by way of a control valve 2 and so no direct effect of the fluctuation of the air pressure supplied to the supply part 1 is expected. Thus, anomaly of pressure supply as seen in conventional techniques is prevented and desired air pressure can be supplied to the output part 3 side regardless of the fluctuation of the supply air pressure with a hand pump 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure supply system for supplying a minute desired air pressure, and more particularly, to an automatic pressure control device for calibrating a measurement error of a pressure gauge when the pressure gauge is inspected. Pressure supply system suitable for use in

[0002]

2. Description of the Related Art Generally, a large number of pipes are provided in a plant facility, and pressure gauges are installed at desired locations in the pipes. These pressure gauges are regularly checked for normality. . Removing the pressure gauge during inspections is not only time-consuming, but also requires shutting down the equipment in some cases. To check the pressure gauge.

An automatic pressure control device for inspecting and adjusting the pressure gauge is provided with a pressure supply for supplying a desired pressure to the pressure gauge in order to determine whether or not the pressure gauge is accurately measuring. It has a system.

As shown in FIG. 3, the conventional pressure supply system is provided with an air pressure supply system including a supply section 1, a control valve 2, and an output section 3. The inspector connects the hand pump 7 to the supply unit 1 and supplies a minute air pressure (0 to 1 MPa) by manually operating the hand pump 7. An input pressure sensor 4 for detecting air pressure is provided between the supply unit 1 and the control valve 2, and an output pressure sensor 5 for detecting air pressure is provided on the output side of the control valve 2. The pressure control section 6 is connected to the output section of the output pressure sensor 5.

[0005] When air pressure is sent from the hand pump 7 to the supply unit 1, the air pressure is sent to the pressure gauge (not shown) via the control valve 2 and the output unit 3. At this time, while the input pressure sensor 4 detects the air pressure sent to the control valve 2 and the output pressure sensor 5 detects the air pressure output from the control valve 2, the detection result of each of the sensors 4 and 5 is used as a pressure control unit. 6 is input.

[0006] When the detection signals from the sensors 4 and 5 are input, the pressure control unit 6 adjusts the opening of the control valve 2 based on preset parameters to provide a desired pressure to the pressure gauge. The air pressure is sent. When the air pressure is supplied to the pressure gauge, the automatic pressure control device diagnoses the operation state of the pressure gauge based on the reaction result of the pressure gauge, and corrects the pressure gauge if an error occurs. It will be.

[0007]

However, the above-mentioned conventional automatic pressure control device does not consider the following. That is, since the air pressure is sent by the inspector by manually operating the hand pump 7, a suddenly high air pressure is sent depending on how the hand pump 7 is operated, or a low air pressure with insufficient capacity is sent. May be taken. Therefore, for example, the control operation of the pressure control unit 6 becomes unstable in accordance with the unstable air pressure from the hand pump 7, and in particular, when an extremely low air pressure is sent, the pressure is automatically controlled by the automatic pressure control device. In some cases, the supply was determined to be abnormal.

The present invention has been made in view of the above-mentioned problems of the prior art,
It is an object of the present invention to provide a pressure supply system capable of outputting a stable air pressure regardless of unstable air pressure supply, and to provide an automatic pressure control device having the pressure supply system. Aim.

[0009]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. In the present invention, the supply section for the hand pump is provided along the direction of air pressure flow,
In a pressure supply system including a control valve, an air pressure supply system having an output unit, and an air pressure control system that adjusts to a desired pressure based on the air pressure supplied from a hand pump and outputs from an output unit, a control valve of the air pressure supply system And an accumulator and a second control valve are installed along the supply direction of the air pressure between the output unit and the output unit. The pressure control unit controls the air pressure sent to the control valve, the air pressure discharged from the accumulator, The opening degree of the control valve and the second control valve is adjusted based on the air pressure discharged from the control valve.

When the air pressure is supplied by the hand pump, the pressure controller adjusts the opening of the control valve and the second control valve based on the magnitude of the air pressure. At the time of the above control by the pressure control unit, if suddenly high air pressure or low air pressure with extremely low capacity is sent to the supply unit side, the air pressure is taken into the accumulator via the control valve, so The fluctuation of the air pressure supplied to the section does not directly affect the downstream side. Therefore, it is possible to prevent the pressure supply from being abnormal as in the related art, and it is possible to supply a desired pressure to the output unit side regardless of the fluctuation of the supply pressure by the hand pump. In addition, a second control valve is provided downstream of the accumulator, and the second control valve is controlled based on the magnitude of the air pressure flowing through the upstream and downstream portions of the control valve. Even if a high air pressure may flow, it is adjusted by the second control valve, so that the desired air pressure can be reliably provided to the output unit side in a stable state, and the reliability of the device is accordingly increased. Can be enhanced. Accordingly, the automatic pressure control device can smoothly perform the inspection of the pressure gauge, and the inspection time can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a piping diagram showing an embodiment of a pressure supply system according to the present invention, and FIG. 2 is an external view showing an automatic pressure control device equipped with the pressure supply system.
As shown in FIG. 1, the pressure supply system includes a supply unit 1, a control valve 2,
An air pressure supply system having an output unit 3 and an air pressure control system having an input pressure sensor 4, an output pressure sensor 5, and a pressure control unit 11 are provided, and the air pressure control system is provided by a hand pump 7 connected to the supply unit 1. A desired air pressure is sent to the output unit 1 based on the air pressure of the air. This is the same as the prior art.

In the present embodiment, an accumulator 8 and a second control valve 9 as an accumulator are provided between the control valve 2 and the output section 3 of the air pressure supply system along the direction of air pressure flow. Further, a second air pressure between the accumulator 8 and the second control valve 9 is detected.
Is provided, and a detection signal thereof is output to the pressure control unit 11.

As shown in FIG. 1, the pressure control unit 11 controls the control valve 2 and the second control valve 2 based on detection signals from the input pressure sensor 4, the second input pressure sensor 10, and the output pressure sensor 5.
The degree of opening with the control valve 9 is adjusted. That is, the pressure control unit 11 adjusts the opening degree of the control valve 2 based on the output signals from the input pressure sensor 4 and the second input pressure sensor 10, while the second input pressure sensor 10 and the output pressure sensor 5 The degree of opening of the second control valve 9 is adjusted based on the detection signal from the controller.
The degree of opening of each of the control valves 2 and 9 is set in advance as a parameter based on the magnitude of the detection signal.

Such a pressure supply system is built in an automatic pressure control device 12 as shown in FIG. The automatic pressure control device 12 has a supply unit 1 and an output unit 3 of a pressure supply system installed on the surface side thereof, and further includes an interface for connecting to a pressure reducing valve connection unit 13, a power supply connection unit 14, a power switch 15, and a personal computer. An operation unit 17 having a unit 16, a plurality of keys 17, a changeover switch and an adjustment switch, a monitor 18 and the like are provided, and have a size that can be carried to a place where a pressure gauge (not shown) is installed.

When the pressure gauge is checked, the pressure gauge is connected to the output unit 3, the hand pump 7 is connected to the supply unit 1, and the power switch 15 is turned on so that the power can be turned on. When the hand pump 7 is operated, the air pressure from the hand pump 7 is sent to the pressure gauge via the supply section 1 to the output section 3 of the pressure supply system as shown in FIG. The state of each sensor and the degree of opening of the control valves 2 and 9 in the system are selectively displayed on the monitor 18 of the operation unit.

In the pressure supply system configured as described above, when air pressure is sent toward the supply unit 1 by manually operating the hand pump 1 at the time of checking the pressure gauge, the air pressure is transmitted through the control valve 2. The pressure is once stored in the accumulator 8 and rises to a desired pressure. Then, when the pressure is increased to a desired level, the pressure is sent to the output unit 3 via the second control valve 9.

At the time of supplying the air pressure, the input pressure sensor 4 detects the air pressure sent to the control valve 2 and the second input pressure sensor 10 detects the air pressure discharged from the accumulator 8, and based on those detections. Pressure control unit 1
1 adjusts the opening of the control valve 2. At the same time, the second
When the output pressure sensor 5 detects the air pressure discharged from the second control valve 9 together with the detection of the input pressure sensor 10 of the above, the pressure control unit 11 determines the opening degree of the second control valve 9 based on the detection signals. Adjust.

At the time of the above control by the pressure control unit 11,
When a suddenly high air pressure or a low air pressure at which the capacity becomes extremely short is sent to the supply unit 1 side, the air pressure is taken into the accumulator 8 via the control valve 2,
The fluctuation of the air pressure supplied to the supply unit 1 does not directly affect the downstream side. Therefore, it is possible to prevent the pressure supply from being abnormal as in the related art, and it is possible to supply a desired air pressure to the output unit 3 side irrespective of the fluctuation of the supply air pressure by the hand pump 7.

In addition, the second side is located downstream of the accumulator 8.
Control valve 9 is provided, and the second control valve 9 is controlled based on the magnitude of the air pressure flowing through the upstream part and the downstream part of the control valve 9. Therefore, for example, high air pressure may flow from the accumulator 8. Even if there is, it is adjusted by the second control valve 9, so that a desired air pressure (small pressure) can be reliably provided to the output section 3 side in a stable state, and the reliability as a device is accordingly increased. Can be enhanced. Thereby, the automatic pressure control device can perform the inspection of the pressure gauge extremely smoothly,
Inspection time can be reduced.

In the illustrated embodiment, the pressure control unit 11 performs calculations based on detection signals from the various sensors 4, 5, and 10, and controls the control valve 2 and the second control valve 9 in accordance with the calculation results. Although an example using a structure configured to adjust the opening is shown, the operation of each of the valves 2 and 9 can also be controlled by making those functions function as software.

[0021]

As described above, according to the first aspect of the present invention, even if an unstable air pressure is supplied, it is possible to prevent the pressure supply from becoming abnormal, and the supply pressure by the hand pump is reduced. Irrespective of the variation of the pressure, the desired pressure can be supplied to the output unit side, so that there is an effect that the reliability can be improved.

According to the second aspect of the present invention, the pressure gauge is provided with a pressure supply system capable of obtaining a stable air pressure irrespective of unstable air pressure supply, so that the pressure gauge can be inspected smoothly. This has the effect that the time can be reduced.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing an embodiment of a pressure supply system according to the present invention.

FIG. 2 is a front view showing an automatic pressure control device equipped with a pressure supply system.

FIG. 3 is a piping diagram showing a conventional pressure supply system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Supply part 2 ... Control valve 3 ... Output part 4 ... Input pressure sensor 5 ... Output pressure sensor 7 ... Hand pump 8 ... Accumulator as accumulator 9 ... Second control valve 10 ... Second input pressure sensor 11 ... Pressure control unit 12: Automatic pressure control device

Claims (2)

[Claims] 1. An air pressure supply system having a supply unit, a control valve, and an output unit for a hand pump in a flow direction of air pressure, a pressure adjusted to a desired pressure based on the air pressure supplied from the hand pump, and output from an output unit. In a pressure supply system provided with a control system, a pressure regulator and a second control valve are installed along a flow direction of air pressure between a control valve and an output portion of the air pressure supply system, and the pressure control system includes a control valve The opening degree of the control valve and the second control valve is controlled based on the air pressure fed to the control unit, the air pressure discharged from the accumulator, and the air pressure discharged from the second control valve. Pressure supply system. 2. A pressure supply system having a supply unit for a hand pump, a control valve, and an output unit in a flow direction of air pressure, and a pressure supply system for adjusting a pressure to a desired pressure based on the air pressure supplied from the hand pump. A pressure control system that outputs a pressure from a pressure control system, a pressure regulator and a second control valve between a control valve and an output unit of an air pressure supply system of a pressure supply system along a flow direction of air pressure. The pressure control system is installed, and the opening degree of the control valve and the second control valve is determined based on the air pressure sent to the control valve, the air pressure discharged from the accumulator, and the air pressure discharged from the second control valve. An automatic pressure adjusting device, characterized in that the pressure is adjusted.