JPH06174145A - Measuring device for valve opening - Google Patents

Abstract

PURPOSE:To achieve high accurate measurement in a wide range further with a simple structure regardless of a kind of measured devices such as a slide valve, butterfly valve, etc. CONSTITUTION:A first acoustic wave X is propagated from a pulse oscillator 2, arranged in a side of one end 1A of a metal bar 1 having an equal length to an opening/closing stroke L2 of a valve unit 5, toward the other end 1B. This first acoustic wave X is received by a receiver 3, stopped by specifying a stop position of the valve unit 5, to also receive a second acoustic wave Y repropagated by reflecting in the other end 1B of the metal bar 1, and by calculating a time difference between timings of receiving the first/second acoustic waves X, Y, output from the receiver 3, in an arithmetic means 11, an opening of the valve unit is calculated and measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve opening measuring device for measuring the opening of a valve element such as a slide valve or a butterfly valve.

[0002]

2. Description of the Related Art Conventionally, various measuring devices have been known as measuring devices for valve opening. In a conventional measuring device of this type, a valve device that linearly moves to open and close, for example, a measuring device used for a slide valve is a movable device in which a measuring device installed in an actuator (cylinder) that linearly moves the slide valve moves the actuator. The position of the member is measured, and the opening degree of the valve element is measured based on the measured position of the movable member.

On the other hand, in, for example, a butterfly valve in which a valve body rotates to open and close, the valve body is directly rotated by a rotating means (for example, a motor with a reducer) to rotate the valve body. The measuring device used for the model configured to open and close is configured to measure the rotation angle of the valve body or the valve rod with a rotation angle measuring device and measure the valve body opening based on the measured rotation angle. ing. In addition, the measuring device used for the model configured to open and close the valve body by rotating the valve rod via the link mechanism by driving a linear movement type actuator such as a cylinder is the same as the slide valve described above. In addition, the position of the movable member in the actuator is measured by a measuring instrument installed in the actuator, and the valve opening is measured based on the measured position of the movable member. However, in the method of measuring the opening degree of the valve body that rotates and opens and closes by measuring the linear movement of the movable member in the actuator, high precision measurement cannot be expected, and the structure of the measuring device is complicated. Have

In other words, in the conventional measuring device, the model to be measured is restricted to a specific one, so that the measuring range is narrow and
The structure has complex drawbacks. Therefore, there is a demand for the development of a measuring device having a simple structure that can measure a wide range regardless of the model to be measured and that can perform highly accurate measurement.

[0005]

The problem to be solved is that the model to be measured is limited to a specific one, so that the measuring range is narrow and the structure is complicated.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a metal rod having a length corresponding to the opening / closing stroke of a valve body, and an output sound pressure of a sound wave is disposed at one end of the metal rod and at one end of the metal rod. A pulse oscillator for applying a pulse wave and a first sound wave corresponding to the metal rod and arranged so as to be movable back and forth at the same time as the valve body along the axis thereof and output from the pulse oscillator and propagating in the metal rod toward the other end. A receiver that receives the second sound wave that is received on the way and that is reflected by the other end of the metal rod and re-propagates in the metal rod toward one end, and a receiver of the first sound wave that is output from this receiver. And a calculation means for calculating the opening degree of the valve body by calculating the time difference between the wave timing and the reception timing of the second sound wave, and can measure in a wide range regardless of the model to be measured, Moreover, the simple structure enables high-precision measurement. To achieve the purpose of providing a location.

[0007]

According to the present invention, the receiver approaches the metal rod and moves along the axis of the metal rod as the valve body opens and closes. Therefore, the stop position of the receiver when the valve body is stopped specifies the opening degree of the valve body. Here, if the output sound pressure of the sound wave is applied from the pulse oscillator to one end of the metal rod,
A sound wave propagates through the metal rod toward the other end. This first sound wave is received by the receiver on the way to the other end of the metal rod. Further, the first sound wave traveling through the stop position of the receiver is reflected by the boundary surface of different media. That is, it reflects at the other end of the metal rod. As a result, the second sound wave re-propagates in the metal rod toward one end. This second sound wave is received by the receiver on the way to reach one end of the metal rod. Since the reception timing of the first sound wave and the reception timing of the second sound wave are output from the receiver to the calculation means, the calculation means calculates the time difference between the reception timing of the first sound wave and the reception timing of the second sound wave. Then, it can be measured by calculating the opening degree of the valve body.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example in which the present invention is applied to a slide valve. In this figure, a valve opening measuring device includes a metal rod 1, a pulse oscillator 2, a receiver 3 and a computing means 4. is doing. The metal rod 1 is formed in a linear shape and is attached to the surface of the box 6 with its length L1 set to a value equal to the opening / closing stroke L2 of the valve body 5. A pulse oscillator 2 is arranged close to one end 1A of the metal rod 1. The pulse oscillator 2 has a function of converting electric vibration into mechanical vibration by utilizing a magnetostriction phenomenon or the like to generate a sound wave. On the other hand, the receiver 3 is arranged so as to approach the metal rod 1 and to move back and forth at the same time as the valve body 5 along the axis C thereof. That is, the receiver 3 is attached to the movable portion 7A of the actuator 7 formed of a cylinder that opens and closes the valve body 5 by linearly moving the valve body 5, that is, the piston rod 7A, and is configured to move forward and backward simultaneously with the valve rod 5A and the valve body 5. The sound wave signal received by the receiver 3 is output to the arithmetic means 4.

With such a structure, the receiver 3 approaches the metal rod 1 and moves along the axis C of the metal rod 1 as the valve body 5 is opened and closed by driving the actuator 7. Therefore, the opening degree of the valve body 1 can be specified by the stop position of the receiver 1 when the valve body 1 is stopped.
Now, when the output sound pressure of the sound wave is applied from the pulse oscillator 2 to the one end 1A of the metal rod 1 in the state where the receiver 3 is stopped at the position B in FIG. The signal propagates toward the other end 1B and, after x hours, is received by the receiver 3 at the B position and is output to the calculating means 4. The first sound wave X traveling through the stop position B of the receiver 3 is reflected by the other end 1B of the metal rod 1. The reflected second sound wave Y is re-propagated in the metal rod 1 toward one end and, after y time, is received by the receiver 3 at the B position and is output to the calculation means 4. That is, the first
Since the reception timing of the sound wave X and the reception timing of the second sound wave Y are output from the receiver 3 to the calculation means 4, the calculation means 4 receives the reception timing of the first sound wave X and the reception timing of the second sound wave Y. By calculating the time difference with the time difference, the opening degree of the valve body 5 (see FIG. 1) corresponding to this time difference can be calculated and measured.

FIG. 3 is a schematic configuration diagram showing another example in which the present invention is used in a butterfly valve. The same or corresponding parts as in FIG. 1 when used for the slide valve are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 3, the metal rod 1 is formed in an arc shape having a predetermined radius of curvature and is attached to the box 6 concentrically with the valve rod 5A. Further, the receiver 3 is attached to, for example, the valve rod 5A so that the receiver 3 can approach the metal rod 1 and rotate simultaneously with the valve body 5 along the arcuate axis C thereof. Even with such a configuration, the opening degree of the valve body 5 can be calculated and measured for the same reason as described above.

As described above, according to the present invention, it is possible to measure regardless of the type of slide valve in which the valve element 5 linearly moves, the butterfly valve in which the valve element 5 rotationally moves, that is, regardless of the model to be measured. The device under test is not specified unlike the device. Therefore, it is possible to expand the measurement range and perform highly accurate measurement with a simple structure.

[0012]

As described above, according to the present invention, it is possible to perform measurement regardless of the type of device to be measured, so that the measurement range is expanded as compared with the conventional measuring device, and the measurement is performed with high accuracy by a simple structure. be able to.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an example in which the present invention is used in a slide valve.

FIG. 2 is an operation explanatory diagram.

FIG. 3 is a schematic configuration diagram of an example in which the present invention is used in a butterfly valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal rod 1A One end of a metal rod 1B The other end of a metal rod 3 Receiver 4 Computing means C Axial line of a metal rod L1 Length of a metal rod L2 Opening / closing stroke of a valve body X 1st sound wave Y 2nd sound wave

Claims (1)

[Claims] 1. A metal rod having a length corresponding to an opening / closing stroke of a valve body, and a pulse oscillator arranged at one end of the metal rod to apply an output sound pressure of a sound wave to one end of the metal rod.
While receiving the first sound wave corresponding to the metal rod and arranged along the axis thereof so as to be able to move forward and backward simultaneously with the valve body and which is output from the pulse oscillator and propagates in the metal rod toward the other end, A receiver that receives the second sound wave that is reflected at the other end of the metal rod and re-propagates in the metal rod toward one end, and a reception timing of the first sound wave output from this receiver and a second sound wave. An apparatus for measuring a valve opening, comprising: a calculating unit that calculates a time difference from a wave reception timing to calculate an opening of a valve body.