JP2002236041A - Vortex flowmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive vortex flowmeter which can avoid troubles due to clogging and is reducible in cost through an integrated constitution. SOLUTION: The vortex flowmeter which measures the velocity and rate of a flowing fluid by detecting variation in alternating pressure caused by Karman vortex by using an electrostatic capacity electrode is equipped with a vortex-generating body or pressure-receiving body, which is provided orthogonally to a measurement duct and constituted integrally with the measurement duct from the beginning, a groove part which is provided at a joint part at one end of the vortex-generating body or pressure receiving body for the measurement duct and forms a flexible part supporting the one end on the measurement duct, and a movable electrode which is constituted integrally with the measurement duct from the beginning, has one end connected to one end of the vortex-generating body or pressure-receiving body, and constitutes one electrode of the electrostatic capacity electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inexpensive vortex flowmeter which can avoid troubles due to clogging and can reduce the cost by an integral structure.

[0002]

2. Description of the Related Art FIG. 8 is an explanatory view of the configuration of a conventional example generally used in the prior art.
(Japanese Patent Application No. 3-159276). In the drawing, a base 2 is fixed to a side wall of a pipe 1 with a screw, and a detector 3 is fixed to the base 2 with a screw.

The base 2 mainly includes a substrate 2a as a fixing portion to the outer periphery of the side wall of the pipeline 1, a support portion 2b inserted into the side wall by a protrusion at the center of the substrate 2a, and a pipe from the support portion 2b. It comprises a columnar body 2c for supporting Karman vortex generation, which protrudes into the inside of the channel 1, and a support portion 2d which is located at the tip of the columnar body 2c and is inserted into an opposing portion of the side wall of the conduit 1.

Each of the bearings 2b and 2d is inserted into the side wall of the pipe 1 by virtue of the respective O-rings 5 for vibration isolation of the column 2c.
6 is made.

The detector 3 mainly includes a flange 3a fixed to the surface of the substrate 2a by screws, a column 3b extending from the flange 3a to the inside of the pipeline 1, and a column 3c as a Karman vortex generator. A support 3d which is located at the tip of the columnar body 3c and is inserted through the O-ring 7 into the center of the support 2d of the base 2, and a support extending from the flange 3a to the outside of the pipeline 1. 3e, and a weight 3f fixed to the tip of the column 3e so as to be adjustable in position.

[0006] All the above-mentioned parts constituting the detection body 3 are coaxial. The O-ring 7 is for vibration isolation of the columnar body 3c. The movable electrode 22 is fixed to the upper surface of the flange 3a via the insulating plate 21.

[0007] Flange 3a, support 3e, weight 3
The cover 26 is fixed to the upper surface of the substrate 2a so as to cover f in common, and the internal space is evacuated. A pair of fixed electrodes 24 and 25 are fixed to the inner surface of the cover 26 so as to face and close to the movable electrode 22 via a common insulating plate 23.

[0008]

FIG. 8 shows a conventional eddy flow meter of the capacitance detection type, in which the pipe and the vortex generator or the pipe and the detecting section are formed as separate parts and are fixed by welding. The structure is fixed with bolts.

Therefore, since the pipe and the vortex generator or the detection unit are formed as separate components, if a foreign substance is clogged or adhered to the gap between them, a detection error may occur or the detection may not be possible. is there.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an inexpensive vortex flowmeter which can avoid troubles due to clogging, can reduce the cost by an integrated structure, and can reduce the cost. .

[0011]

In order to achieve the above object, according to the present invention, in the first aspect, a change in the alternating pressure due to Karman vortex is detected by using a capacitance electrode to detect a flow velocity. In a vortex flowmeter for measuring a flow rate, a vortex generator or a force receiving member which is provided orthogonal to a measurement pipe and is integrally formed with the measurement pipe from the beginning, and one end of the vortex generator or the force receiving body, A groove portion that is provided at a joint with a measurement pipeline and forms a flexible portion that supports the one end to the measurement pipeline;
A movable electrode which is integrally formed with the measurement pipe from the beginning and has one end connected to one end of the vortex generator or the force receiving member and constitutes one of the capacitance electrodes.

According to a second aspect of the present invention, in the vortex flowmeter according to the first aspect, a first separation groove provided in an axial direction of the vortex generator and a direction orthogonal to the axial direction of the vortex generator. And a second separation groove formed in the vortex generator in cooperation with the first separation groove.

According to a third aspect of the present invention, in the vortex flowmeter according to the first aspect, a notch provided at one end of the vortex generator to form the force receiving member; A vortex generator and a third separating groove provided at a boundary with the force body for separating the vortex generator from the force receiving body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention,
FIG. 2 is a side view of FIG.

In the figure, a vortex generator or force receiver 32 is shown.
Is provided orthogonal to the measurement pipeline 31 and is integrally formed with the measurement pipeline 31 from the beginning. In this case, the vortex generator and the force receiving element are also used.

The groove portion 33 is provided at one end of the vortex generator or force receiving member 32 at the junction with the measurement conduit 31, and forms a flexible portion 34 that supports one end of the vortex generator or force receiving member 32 in the measurement conduit 31. The movable electrode 35 is integrally formed with the measurement conduit 31 from the beginning, and one end of the movable electrode 35 is connected to one end of the vortex generator or the force receiving body 31 to form one of the capacitance electrodes.

The fixed electrode 36 is provided so as to face the movable electrode 35, and forms a capacitance electrode with the movable electrode 35.

In short, the root of the vortex generator 32 is cut out from both sides by grooves 33 so that only the central portion remains in the flow direction, and the diaphragm 34 having a thin wall to reduce the alternating lift of the vortex received by the entire vortex generator 32. And transmitted to the movable electrode 35 via the.

A fixed electrode 36 is disposed above the movable electrode 35 so that the capacitance can be detected.

As a result, (1) since there is no gap between the pipe line 31 and the detectors 35 and 36, a vortex flowmeter which can avoid troubles due to clogging can be obtained.

(2) Since the pipe 31, the vortex generator 32, and the pressure receiving portion 32 can be integrally formed, the cost can be reduced.
An inexpensive flow meter can be obtained.

FIG. 3 is an explanatory view of a main part of another embodiment of the present invention, FIG. 4 is a side view of FIG. 3, and FIG. 5 is a sectional view of each part of the vortex generator 41. In this embodiment, the first separation groove 42
Are provided in the axial direction of the vortex generator 41.

The second separation groove 43 is provided in a direction orthogonal to the axial direction of the vortex generator 41, and forms a force receiving member 44 in the vortex generator 41 in cooperation with the first separation groove 42. .

As a result, since the force receiving member 44 is integrally formed with the vortex generator 41, a more inexpensive flow meter can be obtained.

FIG. 6 is an explanatory view of a main part of another embodiment of the present invention, and FIG. 7 is a side view of FIG. In this embodiment,
The notch 52 is provided at one end of the vortex generator 51 and forms a force receiving body 53.

The third separation groove 54 is provided at the boundary between the vortex generator 51 and the force receiving member 53, and is formed between the vortex generator 51 and the force receiving member 53.
And separate.

As a result, since the force receiving member 53 is formed integrally with the vortex generator 51, a more inexpensive flow meter can be obtained.

It should be noted that the foregoing description has been directed to specific preferred embodiments for the purpose of illustration and illustration of the invention. Therefore, the present invention is not limited to the above-described embodiments, and includes many more modifications without departing from the spirit thereof.
This includes deformation.

[0029]

As described above, according to the first aspect of the present invention,
According to the above, the following effects are obtained. (1) Since there is no gap between the pipeline and the detection unit, a vortex flowmeter that can avoid troubles due to clogging can be obtained.

(2) Since the pipe, the vortex generator, and the pressure receiving portion can be integrally formed, the cost can be reduced, and an inexpensive flowmeter can be obtained.

According to the second and third aspects of the present invention, the following effects can be obtained. Since the force receiving member is integrally formed with the vortex generator, a more inexpensive flowmeter can be obtained.

Therefore, according to the present invention, troubles due to clogging can be avoided, the cost can be reduced by an integrated structure, and an inexpensive vortex flowmeter can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a main part configuration of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 4 is a side view of FIG. 3;

5 is a sectional view of each part of the vortex generator 41. FIG.

FIG. 6 is an explanatory diagram of a main part configuration of another embodiment of the present invention.

FIG. 7 is a side view of FIG. 6;

FIG. 8 is an explanatory diagram of a configuration of a main part of a conventional example generally used in the related art.

[Explanation of symbols]

 31 Measurement Pipeline 32 Vortex Generator or Force Receptor 33 Groove 34 Flexible Part 35 Movable Electrode 36 Fixed Electrode 41 Vortex Generator 42 First Separation Groove 43 Second Separation Groove 44 Power Receptor 51 Vortex Generator 52 Notch Part 53 force receiving element 54 third separation groove FL measuring fluid

Claims (3)

[Claims] 1. A vortex flowmeter for measuring a flow velocity by detecting a change in an alternating pressure due to a Karman vortex using a capacitance electrode. A vortex generator or a force receiving member integrally formed with the vortex generator or the force receiving member, and a flexible portion provided at a joint portion of one end of the vortex generator or the force receiving member and supporting the one end to the measurement channel; A groove portion to be formed; and a movable electrode which is integrally formed with the measurement pipe from the beginning and has one end connected to one end of the vortex generator or the force receiving member and constitutes one of the capacitance electrodes. A vortex flowmeter characterized by the following. 2. A first separation groove provided in an axial direction of the vortex generator, and a first separation groove provided in a direction orthogonal to an axial direction of the vortex generator.
A second separation groove which forms the force receiving member in the vortex generator in cooperation with the first separation groove.
Vortex flowmeter as described. 3. A notch provided at one end of the vortex generator to form the force receiving member; and a vortex generator and the force receiving member provided at a boundary between the vortex generator and the force receiving member. 3. The vortex flowmeter according to claim 1, further comprising a third separation groove for separating the vortex flow from the vortex flowmeter.