JPS6318891Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a vortex flowmeter in which the vortex generating body is composed of two members, an outer cylindrical member made of a flexible material and an inner member, and the inner member is a cartridge type.

Various configurations of vortex generators in vortex flowmeters are known, among which one is known that uses a method to detect distortion and deformation of the vortex generator due to vortex generation. In this type of vortex generator, an electric component such as a strain gauge is generally fixed to the vortex generator as a strain detection element, and the strain displacement of this strain gauge is electrically converted into a converted amount using a lead wire. It has an integrated structure that can be led to the outside. Therefore, in the event of a defective internal structure such as damage to the strain sensing element or breakage of the lead wire, the vortex generator must be warped and replaced, and measures such as disassembly, repair, and replacement must be taken. The problem was that it was difficult to

This invention was made with attention to the above-mentioned points, and aims to provide a vortex flowmeter in which the vortex generator is divided into two parts, an outer tube part and an inner insertion part, and in particular, the strain detection element and lead wires are integrally incorporated into the inner insertion part, making it possible to eliminate the above-mentioned inconveniences by simply attaching, detaching, and replacing both parts.

An embodiment of this invention will be described below with reference to the drawings.

1 is a pipe of a desired size; 2 is a vortex generator inserted into the pipe; the upper end is fixed to the opening 3 bored in the upper part of the pipe 1; the lower end is slightly connected to the lower part of the pipe 1; It is disposed on the center line of the conduit 1 with a gap such that it forms a vortex flowmeter a together with the conduit 1.

Here, the vortex generator 2 is an outer cylinder member 21 made of a flexible material and having a desired cross-sectional shape.
and an inner member 2 inserted into this outer cylinder member 21.
2, and the opening flange 211 of the outer cylindrical member 21 can be fixed to the conduit 1 together with the peripheral edge of the opening 3 of the conduit 1 with a fastener 4 such as a screw. In addition, the insertion member 22 has a base end flange 2
21 is brought into contact with the opening flange 211 of the outer cylindrical member 21, and can be similarly fixed with a fastener 5 such as a screw.

In addition, the inner member 22 has a size that can match the inner wall of the outer cylinder member 21, and has a notch 222 cut in the outer periphery of the lower part and can linearly contact the inner wall of the outer cylinder member 21 near the lower end. Annular projection 22
3 is formed in a protruding manner, and further a narrow portion is provided adjacent to the annular projection 223, and a notch 222 of the narrow portion is formed.
Strain detecting elements 23, 23 such as strain gauges are buried in opposing positions on the left and right corresponding to the left and right sides, and the lead wires 231, 231 are led out to the outside by passing vertically through the insertion member 22.

Then, this inner member 22 is also connected to the outer cylinder member 2.
Of course, it is possible to process and mold the material using a flexible material that can follow the flexible deformation of the material.

The operation of this device will be explained based on the above structure.

When the fluid flowing through the pipe 1 passes through the vortex generator 2, Karman vortices are alternately generated on both downstream sides of the vortex generator 2.

Since a pressure change occurs in the fluid due to the generation of this Karman vortex, the vortex generator 2 receives the pressure change, and this vortex generator 2
1 and an inserting member 22, and since it has a flexible structure, it is flexibly deformed as a Karman vortex is generated, and the flexural deformation phenomenon is detected by the strain detection elements 23, 23.
It can sensitively detect Karman vortices and measure the flow velocity and flow rate of fluid.

The flexible deformation phenomenon of the outer cylindrical member 21 is caused by the distortion of the strain detection elements 23, 23 embedded in the notch 222 due to the narrow part having the notch 222 formed in the inner member 22 and the annular protrusion 223. Since the displacement is promoted, detection sensitivity can be improved. Furthermore, if a defective accident occurs such as breakage of the lead wires 231, 231 or damage to the strain detection elements 23, 23, loosen and remove the stopper 5, pull out the inner member 22 from the outer cylinder member 21, and replace it with another new inner member. It can be easily repaired and replaced by inserting the insertion member 22 and fixing it with the stopper 5.

Furthermore, even if a defect or failure occurs in the outer cylinder member 21, it can be easily repaired by similarly removing the stopper 4 and replacing it with a new member.

In the above embodiment, the vortex generator 2 has a so-called cantilever structure in which its upper end is fixedly supported at the upper part of the pipe line 1. It goes without saying that a so-called double-supported structure in which the device is supported by a portion can also be implemented in the same manner. According to the present invention, the vortex generating body is constituted by an outer cylinder member and an inner member inserted into the cylindrical shape of the outer cylinder member, and an annular projection is provided near the tip of the inner member, and the outer cylinder By forming the narrow portion inscribed in the member and adjacent to the annular projection, the vortex fluctuation stress acting on the vortex generating body can be detected using the annular projection as the point of force.
This has the effect of improving detection sensitivity.

Furthermore, according to this invention, the vortex generating body is composed of two members, an outer cylinder member and an inner member, and has a kind of cartridge structure, so that damage to the strain detection element, breakage of the lead wire, etc. If a failure occurs, all you need to do is replace or repair the strain sensing element.
Easy and quick repair. In addition, by providing a notch on the outer periphery of the lower part of the inner member, embedding a strain detection element in the notch, and providing an annular protrusion near the lower end, strain in the outer cylinder member is reliably transmitted to the inner member. Furthermore, since the bending rigidity is small and the lever ratio is large, detection sensitivity can be improved and a highly accurate vortex flow meter can be provided. Furthermore, since the strain detection element is protected inside the vortex generator, it is not affected by the fluid to be measured and can be used for many types of fluids. Furthermore, when replacing the insert member in which the strain detection element is embedded, it is possible to replace the vortex generator with the vortex generator attached to the pipe, which is convenient.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the vortex flowmeter according to the invention, and FIG. 2 is a sectional view taken along the line -1 of the same. DESCRIPTION OF SYMBOLS 1... Pipeline, 2... Vortex generator, 4, 5... Stop, a... Vortex flowmeter, 23... Strain detection element, 23
1... Lead wire.

Claims (1)

[Scope of utility model registration request] In a vortex flowmeter with a vortex generator inserted into the pipe,
An outer cylindrical member formed in a cylindrical shape made of a flexible material that opens at the flange portion that fixes the vortex generator to the pipe line and seals the other end; An annular projection is provided near the tip of the insertion member to be inscribed in the outer cylindrical member, and a narrow portion is formed adjacent to the annular projection, and a notch is provided on the side surface of the narrow portion. A vortex flow meter characterized in that a strain detection element is embedded in the side surface of the notch, and the vortex fluctuation stress acting on the vortex generating body is detected by the strain detection element.