JP2000304578A - Flow rate measuring instrument and valve device with flow rate measuring function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively actualize automatic control over a flow rate associated with flow rate measurement and the opening and closure of a valve while saving the space, labor, and cost with a simple structure using a very small number of constitution elements. SOLUTION: This device is equipped with a gauge 15 which measures the lift generated by a butterfly type valve body 13 or the strain generated at the valve body 13 or the part connecting thereto by the lift forming the valve body 13 which opens and closes a flow passage by rotation on an axis crossing the flow passage axis at right angles in a blade shape for generating the lift by a flow of fluid and an arithmetic means 15 which finds the flow velocity from the measurement result of the gauge 15 and calculates the flow rate from the found flow velocity and the sectional area of the flow passage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention measures the flow rate of a fluid flowing through various fluid pipes and, based on the measurement results,
For example, the present invention relates to a flow rate measuring method and a valve device with a flow rate measuring function applied when a fluid flow is urgently stopped or opened or a flow rate is controlled by automatically opening / closing or adjusting an opening degree of a valve.

[0002]

2. Description of the Related Art In the above-mentioned automatic control of a flow rate, conventionally, generally, a flow meter and a valve are separately installed in a fluid pipe, and the valve is automatically operated according to a flow rate measurement result by the flow meter. A method of linking the two so as to open and close or adjust the opening degree has been adopted.

[0003]

However, in the above-mentioned conventional method, not only a large installation space is required for separately installing the flow meter and the valve, but also it is necessary to separately maintain and manage them. Therefore, there is a problem that it is troublesome and troublesome. In addition, even with a flow meter alone, the rotation of an impeller rotating in response to a fluid flow is taken out with a gear or the like, and the number of revolutions taken out is measured to determine the flow velocity. As shown in the figure, a structurally complex and costly flow meter composed of a combination of many components is used, and such a flow meter is excellent in flow measurement performance. It is not suitable for automatic control of the flow rate by coordination with opening and closing of the valve or adjustment of the opening degree.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a simple structure using a very small number of components, and a flow rate measuring method and a flow rate measuring method capable of measuring a flow rate as specified. An object of the present invention is to provide a valve device with a flow rate measurement function capable of realizing space saving, labor saving in maintenance and management, and cost reduction in automatic control of a flow rate in cooperation with opening / closing or opening degree adjustment.

[0005]

In order to solve the above-mentioned problems, a flow rate measuring method according to the present invention comprises a wing-shaped lift generating member which generates lift by a fluid flow in a flow path, The lift generated by the lift generating member or the strain generated in the lift generating member due to the lift is measured to determine the flow velocity, and the flow rate is calculated from the flow velocity and the flow path cross-sectional area.

Further, in the valve device with a flow rate measuring function according to the present invention, the butterfly type valve element capable of opening and closing the flow path by rotation about an axis perpendicular to the flow path axis increases lift by the fluid flow. A lift or strain measuring means which is formed in a wing shape to be generated, measures a strain generated in the valve body or a portion connected thereto by the lift or lift generated by the wing-shaped valve body, and obtains a flow velocity from the measurement result, and And a calculating means for calculating the flow rate from the flow rate and the flow path cross-sectional area.

According to the method of the present invention, the lift generated by the fluid flow or the strain generated in the member due to the lift is measured while having a very simple structure in which the wing-shaped lift generating member is arranged in the flow path. By doing so, it is possible to obtain a flow velocity having a certain relationship with the lift or the strain, and measure the flow rate as predetermined from this flow velocity and the known flow path cross-sectional area.

A butterfly type valve body is formed in a wing shape, and a lift generated by the wing-shaped valve body or a strain generated in the valve body or a portion connected to the valve body due to the lift is measured to obtain a flow velocity to obtain a flow rate. According to the valve device of the present invention configured to calculate the valve function, the valve function and the flow rate measurement function can be combined into one product (valve device) only by devising the shape of the butterfly valve element. It is possible to realize the automatic control of the flow rate by linking the opening and closing of the valve or the opening degree adjustment and the flow rate measurement. Can be significantly reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional plan view showing a schematic configuration of an entire flow rate measuring device for implementing a flow rate measuring method according to the present invention, and FIG. 2 is a longitudinal side view thereof. A single-wing-shaped lift generating member 3 that generates a lift L by a fluid flow is disposed at the center of an internal flow path 2 in a cylindrical casing 1 that can be concentrically interposed in the fluid pipe P and flange-joined. ing. This single-wing-shaped lift generating member 3 is fixedly held to the cylindrical casing 1 via the shaft member 4 so that the angle (angle of attack) α formed by the fluid flow velocity ω and the chord 3a is constant. I have.

A gauge 5 for measuring a lift L generated in the lift generating member 3 by a fluid flow or a strain generated in the member 3 by the lift L is attached to the chord 3a of the lift generating member 3. The lift or strain measurement gauge 5 receives the measurement result, obtains a flow rate having a fixed relationship with the lift or strain, and obtains a flow rate from the flow rate and a known flow path cross-sectional area set in advance. The calculating means 6 for calculating is connected. The operation means 6
Display means 7 such as an LCD for displaying the calculated flow rate.
Is connected.

According to the flow rate measuring device having the above structure, when the fluid in the fluid pipe P flows through the internal flow path 2 of the cylindrical casing 1, the lift L is applied to the lift generating member 3 by the fluid flow.
The lift or the strain generated in the lift generating member 3 due to the lift L is measured by the gauge 5, and the measured value is input to the calculating means 6. Then, in the calculating means 6, a flow rate having a certain relationship with the lift L or the strain is obtained, and a flow rate is calculated by a product of the obtained flow rate and a known flow path cross-sectional area set and input in advance. The calculated flow rate is displayed on the display means 7.

Although the above embodiment is a device dedicated to flow measurement, a valve device incorporating a flow measurement function based on the same principle will be described below. FIG. 3 is a cross-sectional plan view showing a schematic configuration of the entire valve device with a flow rate measurement function, and FIG.
Is a longitudinal side view thereof. At the center of the internal flow path 12 in the tubular valve casing 11 which can be concentrically interposed in the middle of the fluid pipe P and can be flange-bonded, an outer circular-shaped butterfly valve element 13 is orthogonal to the flow path axis a. The butterfly type valve body 13 is rotatably held around an axis b which is formed by the shaft b.
Is rotated by about 90 ° around the position, as shown by the solid line in FIG.
As shown by the imaginary line, it is configured to be switchable to a position where the flow path 12 is fully closed.

The butterfly valve body 13 is formed in a single blade shape such that a lift L is generated by a fluid flow in a cross-sectional shape thereof, and its chord 13a side is in a fully open position shown by a solid line in FIG. It is formed so as to have a constant angle of attack α with respect to the fluid flow velocity ω. A gauge 15 for measuring a lift L generated in the valve 13 by the fluid flow or a strain generated in the valve 13 by the lift L is attached to the chord 13 a of the butterfly valve 13. The gauge 15 receives a result of the measurement, obtains a flow rate having a fixed relationship with lift or strain, and calculates a flow rate from the flow rate and a known flow path cross-sectional area which is set and input in advance. Is connected. Further, the calculating means 16
Is electrically connected to a drive device 18 for rotation operation directly connected to the valve shaft 14, and when the calculated flow rate becomes equal to or more than a predetermined value set in advance, the valve body 13 is shown by a solid line in FIG. A program for outputting a control signal for automatically switching from the fully open position to the fully closed position shown by the phantom line in FIG. 3 is incorporated.

According to the valve device with a flow rate measuring function having the above-described configuration, the butterfly valve element 13 is in the fully open position shown by the solid line in FIG.
Of the valve body 13 due to the fluid flow, the lift or the strain generated in the valve body 13 due to the lift L is measured by the gauge 1.
5 and the measured value is calculated by the arithmetic means 1
6 is input. Lift L input to the calculating means 16
Alternatively, the strain and the flow velocity have a fixed relationship, whereby the flow velocity is obtained, and the flow rate is calculated by the product of the obtained flow velocity and a known flow path cross-sectional area set and input in advance.

When the calculated flow rate becomes equal to or greater than a predetermined value, the rotation operation drive mechanism 18 is automatically operated by the control signal output from the arithmetic means 16 and the valve body 14 13 is automatically switched from the fully open position shown by the solid line in FIG. 3 to the fully closed position shown by the virtual line in FIG. With this, for example, when the downstream piping is damaged due to the occurrence of an earthquake or the like and the flow rate increases abnormally, the valve device itself can automatically detect it and exert a safety function such as an emergency valve closing operation. it can.

In the above-described valve device, the lift acting on the wing-shaped valve body 13 itself or the strain generated by the lift is measured by the gauge 15, but the load on the valve shaft 14 has been described. Even if the load is measured, a similar function can be exhibited.

[0017]

As described above, according to the method of the present invention, the lift generated by the fluid flow or the lift generated by the fluid flow can be obtained only by adopting a very simple structure such as disposing the wing-shaped lift generating member in the flow path. By measuring the strain generated in the member due to the lift force, it is possible to obtain a flow rate having a certain relationship with them, and easily and accurately measure a predetermined flow rate.

Further, according to the valve device of the present invention, a simple product such as forming a butterfly type valve body into a wing shape can be applied to one product (valve device) in addition to the original valve function. The measurement function can be shared. Therefore, when realizing automatic control of the flow rate by linking the opening / closing of the valve or the opening degree adjustment and the flow rate measurement, the installation space can be saved,
Not only can you save labor by unifying maintenance,
This has the effect of reducing the size of the product and significantly reducing the cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view showing a schematic configuration of an entire flow rate measuring device for implementing a flow rate measuring method according to the present invention.

FIG. 2 is a vertical sectional side view showing a schematic configuration of the entire flow rate measuring device.

FIG. 3 is a cross-sectional plan view showing a schematic configuration of the entire valve device with a flow rate measuring function according to the present invention.

FIG. 4 is a vertical sectional side view showing a schematic configuration of the entire valve device with a flow rate measurement function.

[Description of Signs] 2,12 Internal flow path 3 Lift generating member 5,15 Lift or strain measurement gauge 6,16 Calculation means 13 Butterfly valve

Claims (2)

[Claims] A wing-shaped lift generating member that generates lift by a fluid flow is disposed in a flow path, and a lift generated by the lift generating member or a strain generated in the lift generating member due to the lift is measured. A flow rate measuring method comprising: obtaining a flow rate; and calculating the flow rate from the flow rate and the flow path cross-sectional area. 2. A butterfly valve element capable of opening and closing a flow path by rotation about an axis orthogonal to a flow path axis is formed into a wing shape that generates lift by a fluid flow. Lift or strain measuring means for measuring strain generated in the valve body or a portion connected to the valve body by the lift or lift generated by the valve body, and the flow velocity is obtained from the measurement result,
And a calculating means for calculating the flow rate from the flow rate and the flow path cross-sectional area.