JPH06341915A - Pulsating pressure generating device - Google Patents

Abstract

PURPOSE:To make a pulsating pressure generating device have a function capable of varying the waveform and frequency of a pressure, in measuring the responsiveness characteristic to the input pressure of a pressure transmitter or differential transmitter. CONSTITUTION:A pulsating pressure generating device is provided with a driving device 2 having a driving shaft 13 reciprocating according to an inputted electric signal, a pressure generating device 1 connected to the driving shaft 13 of the driving device 2 to convert the reciprocation of the driving shaft 13 into a pressure change, a displacement measuring instrument 14 for detecting the displacement of the driving shaft 13, and a drive control device 3 for supplying a control signal to the driving device on the basis of the displacement signal 18 detected by the measuring instrument 14 and a command signal 17 to drive- control the reciprocation of the driving shaft 13 so that the waveform and frequency of the pressure can be changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulsating pressure generator suitable for application to response characteristic tests of various transmitters such as pressure transmitters and differential pressure transmitters, and particularly to pressure waveforms and The present invention relates to a pulsating pressure generator having a function capable of changing a frequency.

[0002]

2. Description of the Related Art Pressure transmitters and differential pressure transmitters are used to measure the pressure and flow rate of fluids and gases existing in processes and pipes, and when measuring changes in pressure and flow rate. Is related to the response characteristics of the transmitter.

A conventional test means for measuring the response characteristic at this time will be described with reference to FIG. The conventional response characteristic test is carried out by connecting the transmitter 5 and the solenoid valve 15, and the solenoid valve 15 and the pressure supply source 4 by pipes respectively, and connecting the solenoid valve 15 and the solenoid valve control device 16 by a cable. Was there.

The pressure supply source 4 generates pressure to be supplied to the transmitter 5, and turns on / off (open / closes) the solenoid valve 15.
Accordingly, the pressure supply from the pressure supply source 4 to the transmitter 5 is ON / OFF controlled.

The solenoid valve 15 is on / off controlled by an electric signal from a solenoid valve controller 16. When the output signal of the solenoid valve control device 16 is off, the solenoid valve 15 is in the off state, pressure is not supplied from the pressure supply source 4 to the transmitter 5, and the output signal of the solenoid valve control device 16 is on. Then, the solenoid valve 15 is turned on, and pressure is supplied from the pressure supply source 4 to the transmitter 5.

The response characteristic of the transmitter 5 is measured by the solenoid valve 15
With the pressure ON, the solenoid valve 15 is turned off after supplying the pressure PO from the pressure supply source 4, and then the solenoid valve 15 is turned on after the output pressure of the pressure supply source 4 is set to PX. Was. Transmitter 5 in response characteristic test at this time
The relationship between the input pressure and the output signal of is illustrated in FIG.

[0007]

As described above, in the conventional response characteristic testing means, since the pressure input to the transmitter is only turned on / off, the frequency response characteristic of the transmitter and various There is an inconvenience that the response characteristic to the pressure waveform cannot be measured.

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a pulsating pressure generating device having a function capable of varying a pressure waveform and frequency in a pulsating pressure generating device for measuring a response characteristic to an input pressure such as a pressure transmitter or a differential pressure transmitter. And

[0009]

A pulsating pressure generator according to the present invention includes a drive device having a drive shaft that reciprocates in response to an electric signal, a drive control device for controlling the movement of the drive shaft, and a drive device for the drive device. And a pressure generator connected to the drive shaft for converting the reciprocating motion into a pressure change.

[0010]

In the above structure, when the waveform and frequency of the electric signal input to the drive control device are changed, the drive shaft of the drive device reciprocates according to the electric signal, and the reciprocal motion of the drive shaft is generated by pressure. Since the pressure waveform and frequency can be changed by converting the pressure change into pressure change by the device, it is possible to measure the frequency response characteristic of the transmitter and the response characteristic for various pressure waveforms.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a pulsating pressure generator according to an embodiment of the present invention, and FIG. 2 is a diagram showing a device connection of a response characteristic test using the pulsating pressure generator of the embodiment.

A pulsating pressure generating device according to an embodiment of the present invention includes a pressure generating device 1, a driving device 2, and a drive control device 3.
It is configured with. The drive device 2 is provided with a displacement measuring device 14 for detecting the displacement of the drive shaft 13, and the displacement signal detected by the displacement measuring device 14 is supplied to the drive control device 3 together with a command signal.

The drive control device 3 generates a control signal 21 for driving the drive shaft 13 in proportion to the command signal 17, and a displacement measuring device 14 for detecting the displacement of the drive shaft 13.
The control signal 21 is generated by comparing and calculating the displacement signal 18 from the command signal 17 and the command signal 17.

The drive unit 2 inputs the control signal 21 from the drive control unit 3 and controls the valves A11 and B12 to change the pressures in the pressure chambers A9 and B10 to drive the drive shaft 13. Let

The pressure generator 1 converts the displacement of the drive shaft 13 into a pressure change through the piston 7, and opens the valve 8 to supply water, oil or the like to the pressure chamber 6 from the pressure supply device 4. When the piston 7 is driven with the valve 8 closed and full, the pressure in the pressure chamber 6 changes in proportion to the diameter of the piston and the amount of movement. The relationship between the diameter r and displacement d of the piston 7 and the output pressure P of the pressure generator 1 can be expressed by the following equation.

P ∝ r · d As described above, the output pressure of the pressure generator 1 changes according to the command signal 17 input to the drive control device 3, so that the drive control device 3 receives, for example, a sine wave, a triangular wave, and a rectangular wave. By inputting various command signals 17 such as waves, pressure with various waveforms can be generated, and by changing the frequency of the command signal 17, the frequency of pressure can be changed.

[0017]

As described in detail above, according to the pulsating pressure generating device of the present invention, the waveform and frequency of pressure can be varied only by changing the waveform or frequency of the electric signal input to the drive device. Therefore, it is possible to measure the response characteristics of the transmitter with respect to various pressure waveforms.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a pulsating pressure generator according to an embodiment of the present invention.

FIG. 2 is a block diagram showing device connection for a response characteristic test according to the embodiment.

FIG. 3 is a diagram showing a device configuration during a conventional response characteristic test.

FIG. 4 is a diagram showing a relationship between an input pressure and an output signal of the transmitter during the response characteristic test shown in FIG.

[Explanation of symbols]

1 ... Pressure generator, 2 ... Drive device, 3 ... Drive control device,
4 ... Pressure supply device, 5 ... Transmitter, 6 ... Pressure chamber, 7 ... Piston, 8 ... Valve, 9 ... Pressure chamber A, 10 ... Pressure chamber B, 11 ...
Valve A, 12 ... Valve B, 13 ... Drive shaft, 14 ... Displacement measuring device,
15 ... Electromagnetic valve, 16 ... Electromagnetic valve control device, 17 ... Command signal, 18 ... Displacement signal, 21 ... Control signal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuichi Kondo 1-1-1, Wadasaki-cho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (72) Inventor Shigeomi Yoshida Hyogo-ku, Kobe-shi, Hyogo 1-1-1 Wadazakicho Mitsubishi Heavy Industries Ltd. Kobe Shipyard

Claims (1)

[Claims] 1. A drive device including a drive shaft that reciprocates in response to an input electric signal, and a pressure generator that is connected to the drive shaft of the drive device and converts the reciprocal motion of the drive shaft into a pressure change. A displacement measuring device for detecting the displacement of the drive shaft, and an electric signal is supplied to the drive device based on the displacement signal detected by the measuring device and a command signal externally instructed to control the drive shaft to reciprocate. A pulsating pressure generator comprising a drive controller.