JPH02131624U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a diagram showing the outline of the vortex detector of the present invention, in which figure a is a perspective view of the main part, figure b is a sectional view along the A-B axis of figure a, figure c is a completed sectional view of figure b, and figure d is a cross-sectional view of the completed part. The figure is a plan view, Figure 2 is a diagram showing another embodiment, and Figure a is a plan view.
Figure b is a cross-sectional view taken along the line C-D, Figure 3 is a diagram showing a vortex flowmeter equipped with another vortex detector of the present invention, and Figures 4 and 5 are diagrams showing the connection to other vortex flowmeters. It is a figure which shows the example of attachment. 6, 6a, 6b...vortex detector, 601, 601
a, 601b...Low refractive index light guide resin cladding, 602, 602a, 602b...High refractive index light guide resin core, 603, 604... Light guide fiber, 605, 605a... Optical dielectric coating.

Claims (1)

[Claims for Utility Model Registration] 1. A vortex detector in a vortex flowmeter that utilizes the fact that the amount of light transmitted through a light guide that elastically deforms in response to the fluctuating pressure of a vortex decreases in accordance with the deformation of the light guide. In the above-mentioned light guide, a flexible resin light guide with a high refractive index is used as a core, the outside of the core is surrounded by a cladding with a low refractive index resin light guide, and the core is covered with an optical non-conductor. A vortex detector characterized in that a light guide path having an end portion is provided. 2. A core that is a resin optical guide with a high refractive index and a cladding that is a resin optical guide with a low refractive index are plate-shaped, and concave grooves are formed on both sides of the cladding surrounding the core and facing the inner periphery of the core. The vortex detector according to claim 1, characterized in that: 3 An elongated plate-shaped vortex detector that is flat in the flow direction and is arranged parallel to the vortex generator downstream of the vortex generator, and the cross-sectional shape of the vortex detector is a streamlined shape with an acute angle on the inflow and outflow sides. 2. The vortex detector according to claim 1, wherein the vortex detector penetrates through the flow tube wall and is fixed to the flow tube wall in a double-supported beam manner. 4 Transforms the vortex fluctuating pressure introduced through the pressure guide holes opened on both sides of the vortex generator, which are arranged parallel to the flow and communicated with the sensor chamber, in the sensor chamber bored inside the vortex generator. The eddy detector according to claim 1 or 2, wherein the eddy signal is detected as a change in light amount. 5 A vortex generating body is provided symmetrically facing the flow in the flow tube section, which is narrowed from the introduction section with a rectifying grid on the inlet side to a flow tube with a uniform rectangular cross section, to generate a vortex to generate a vortex fluctuating pressure. 3. The vortex detector according to claim 1, wherein the vortex detector detects as a change in the amount of light in a plate-shaped vortex detector disposed on a side wall of the flow tube near the body. 6. Vortex fluctuating pressure on the opposite side of each vortex generating body is introduced into the sealed outer casing with a vacant chamber outside each side wall of the plate-shaped vortex detectors disposed on both side walls of the flow tube. The vortex detector according to claim 5, characterized in that: