JPS5816124B2 - Uzuri yuriyoukei - Google Patents

Description

Detailed Description of the Invention The present invention provides a novel vortex flow rate system in which a vortex generator disposed upright in a fluid flow path is equipped with a movable mechanism that sensitively detects vortex generation and moves the vortex generator alternately left and right with respect to the flow. Regarding the meter.

Various means for detecting vortices generated by the fluid flow of a vortex generating body are known. Among the conventionally known detection means, the present invention is based on mechanical displacement, which can sensitively detect the generation of vortices through movable displacement. year.

The purpose is to provide a vortex flow meter that has a simple configuration, accurate operation, and high productivity.

In addition, one aspect of the present invention is to attach a movable plate member having a planar configuration having an axis parallel to the longitudinal axis of the vortex generator as a fulcrum on the upstream or downstream side of the flow of the vortex generator, and to move the movable plate member along the axis thereof. The movable plate can be moved left and right by sandwiching it, and the movable plate can be moved left and right by changes in the pressure or speed of the fluid caused by the generation of Karman vortices, and this movable movement can be detected to measure the flow velocity or flow rate. We are here to provide you with a vortex flow meter.

Furthermore, another object of the present invention is that the movable plate body:
It has a vertical planar structure facing the flow direction of the vortex generator, and is movably attached to the corresponding surface of the vortex generator with a gap maintained by a shaft.

Further, a vortex flowmeter is provided in which an opening for detecting a vortex is formed between both ends of a movable plate body and a vortex generating body, and a Karman vortex effectively generated by the opening can be reliably detected. It is in.

Another object of the present invention is that the movable plate can be formed not only as a polygonal plate such as a square or rectangle, but also as a plate in a desired shape such as a circular or butterfly shape. Another object of the present invention is to provide a vortex flowmeter in which the vertical height and left and right widths can be freely set within the required sensitivity while taking into account the type of fluid to be measured.

In addition, another object of the present invention is to attach a movable plate having a planar structure to the surface of the vortex generator and protrude it in a plane perpendicular to the flow direction of the vortex generator, or to make the vortex generator project. To provide a vortex flowmeter in which a concave portion is formed on the surface of a generator and the generator is movably supported with a desired gap within the concave portion to make the vortex detection effect effective.

Furthermore, another object of the present invention is that the movable plate body, which is movable alternately left and right due to the generation of vortices, can be used as a rotary motion around an axis, as well as when it is movable around a fixed axis. The object of the present invention is to provide a vortex flowmeter having bearing means for fixing a plate made of a flexible material so that the plate can be operated by a flexible displacement.

Furthermore, another object of the present invention is that the shaft supporting the movable plate is rotatably mounted or fixed;
An object of the present invention is to provide a vortex flowmeter having a bearing means that allows the movable displacement of a movable plate to act as a twisting motion.

Furthermore, another object of the present invention is to dispose a set of detection mechanisms at desired locations on a movable plate body that is movably displaced alternately left and right due to the generation of vortices, and at desired locations on a partition wall or separated. ,
An object of the present invention is to provide a vortex flow meter capable of remotely detecting the movable displacement of a movable plate and counting the flow velocity or flow rate.

Furthermore, another object of the present invention is to provide a shielding plate on the front surface of the movable plate along the mounting position to prevent the movable plate from jumping out from the vortex generator. To provide a vortex flow meter configured.

Having regard to the purposes of the diagonal as well as the other purposes set out below,
The present invention will now be described in detail.

In each figure, a is a vortex generator with a desired cross-sectional shape,
A vortex flow meter A is configured by being fixed upright within a pipe 1.

b is a movable plate member d1 and d2 is an opening formed between the movable plate member and the vortex generator a; A shielding plate is placed along the central part of the bearing to prevent the plate from flying out. G indicates a gap formed around the movable plate.

Furthermore, FIGS. 1 to 5 all show cases in which the movable plate has a rectangular shape.

First, Fig. 1 shows that on one plane 1a on the upstream or downstream side of the flow of the vortex generator a, there is a side length q that is equal to or smaller than the width p, and that is much larger than the pipe diameter d. A rectangular movable plate having a small length h on the other side is mounted with a desired bearing C and an opening d1. formed by a gap G that is smaller than one plane 1a and both ends of the movable plate. d2, and there is a shield e in the center of the movable plate corresponding to the bearing C to prevent the movable plate from jumping out.
is attached with the gap G maintained in the same way, but the shield plate e may be present or not.

FIG. 2 shows that in the embodiment shown in FIG. 1, a concave portion 2 is bored in one plane 1a of the vortex generating body a, and a gap G is maintained in the concave portion 2 so that the movable plate body can be movably supported on the bearing. One side of C
A can be said to be constructed so that they are each coplanar.

In this embodiment, both ends of the concave portion 2 are connected to the vortex generator a.
The opening d is opened on both sides of the movable plate body.
1. It is significantly different from the one in FIG. 1 in that it constitutes d2.

Further, FIG. 3 shows that raised walls 3, 3 are provided protrudingly at desired locations above and below one plane 1a of the vortex generating body a to form the concave portion 2 in the above embodiment.
A rectangular movable plate is formed in the concave portion 2 by its bearing C to form a gap G and an opening d1. This is to maintain d2 while establishing cardinal control.

Next, FIG. 4 will be explained.

In this embodiment, the height h of the movable plate shown in FIG. 1 is increased to the same extent as the pipe diameter d; the bearing means C1, the gap G, the opening d1. d2 and other configurations are the same as those in FIG. 1 and there is no difference.

In addition, FIG. 5 shows the embodiment shown in FIG. 2, with the recess 2 facing near the pipe wall above the vortex generator a, and a movable plate member is installed in the deformed recess 2. , and is arranged under exactly the same configuration as in FIG. 1b.

In the embodiment shown in FIG. 4 of the same text, the size of the movable plate is much larger than that of the embodiment shown in FIGS. 1 to 3, and the movable plate covers the entire area of one plane 1a. Because of its large size, the vortex detection sensitivity is high, and high accuracy can be obtained.In addition, since the embodiment shown in FIG.
Compared to the embodiments shown in Figures 3 to 3, this embodiment is more effective in that it is easier to detect the vortices of the movable plate which is displaced as the vortices are generated, and therefore a vortex flow meter with higher accuracy can be provided.

The operation will be explained based on the diagonal configuration.

It is now assumed that the fluid is flowing perpendicularly to one plane of the vortex generator a.

At that time, when the fluid passes through the vortex generator a, the vortex generator a
As a result, vortices are generated alternately on both sides of the vortex generator a on the downstream side of the flow.

When a vortex is generated, the pressure in the vortex area is lower than in other areas, so the fluid pressure is lower at the opening d1 on the side where the vortex is generated than at the opening d2 on the side where the vortex is not generated. , the flow velocity of the fluid on both sides of the movable plate body sandwiching the bearing C is different, and the movable plate body a moves and is displaced around the bearing C toward the opening d1 of the vortex generating body a.

Next, when a vortex is generated on the opposite side of the vortex generator, the movable plate moves to the opening d2 side under exactly the same action, and in this way, it repeatedly responds every time a vortex is generated. The movable plate continues the movable displacement action, and the movable plate rotates left and right by performing a type of flip-flop phenomenon.

The embodiments shown in FIGS. 6 to 8 show several examples in which the rectangular movable plate of the previous embodiment is changed to a circular or other desired shape. Extending recesses 2a, 2a are bored in both sides of the circular recess 2 in which the circular recesses are disposed, and openings d1. d2.

In the embodiment shown in FIG. 7, the movable plate body shown in FIG. A portion is cut out to form a so-called oval shape, and a concave portion 2 that roughly matches this shape is bored and an opening d1. is formed as in the previous embodiment. d2
．． A movable plate body is pivotally supported under the gap G and the shielding plate e so as to be movably displaced.

6 and 7, the movable plate body has a circular structure, so compared to the rectangular structure described above, the one in FIG. Are better.

Next, in FIG. 8, the movable plate maintains a so-called butterfly shape expanded in the left-right direction.

This movable plate has both openings d1. Since d2 has a larger effective area than the gap G in the central portion, it has a great feature in that it has high responsiveness to vortex generation and can maintain good sensitivity.

Although movable plate bodies having various shapes other than rectangular have been described above, the movable plate itself may have any shape as long as it is planar.

Also, depending on the means of the bearing C, the movable plate may be made of a non-flexible material, or may be made of a thin flexible material. This is satisfied by being able to perform all kinds of physical displacement movements such as left and right rotation, bending, and flexible deformation around C.

Of course, in this case, rotation, twisting, and flexible deformation of the shaft of the bearing C itself are included.

Furthermore, in the explanation of the operation of this embodiment, only one direction of fluid flow was described, but it goes without saying that the same operation can be achieved even when the fluid flows in the opposite direction.

Next, the detection mechanism f according to the present invention will be explained.

The detection mechanism f shown in each figure is a part of the movable plate (including its bearing C, but if possible, it may be preferable to use the outer end where the movable amplitude is largest).

), the movable detection elements t and I are attached to the movable detection element f1.
The fixed detection element f2 is arranged at a position separated from the movable detection element f1, for example, inside the vortex generating body a, facing the movable detection element f1, and the pair of elements f1. The detection mechanism f consisting of f2 is not limited to any special configuration.

For example, when the movable detection element f1 is attached to the vortex generator a as a permanent magnet, the fixed detection element f1 can be incorporated as an electromagnetic pickup to provide electromagnetic detection means.

In addition, since the movable plate body reciprocates in the left and right directions around the bearing means C, by providing the rain detection elements fl and f2 with an electrostatic structure, the capacitance based on the change in contact and separation of the rain detection elements f1 and f2 can be reduced. Not only can it be detected as a change,
Furthermore, a reflecting plate is incorporated into the movable plate body as a movable detection element f1, and the light-receiving material is fixed to the detection element at a desired location on the outer periphery of the vortex generator a or inside the tube to which the vortex generator a is attached. By installing the fixed detection element f1 as f1, it is possible to detect the generation of a vortex by optical means, and the point is that the fixed detection element f1 can be freely placed anywhere inside or on the outer periphery of the vortex generator a, depending on the detection means. It can be installed in

According to the present invention, as described above, a movable plate having a desired shape is disposed in a plane on the front or rear surface of a desired vortex generating body, facing the fluid flow, by a desired bearing means, and A gap is provided between the movable plate and one surface of the vortex generator, and openings for vortex detection are provided on both sides of the movable plate, so that when fluid passes through the vortex generator, it detects the vortex from the side of the vortex generator. , vortices are generated alternately, and these vortices affect the opening of the movable plate, sandwiching the bearing part of the movable plate and making the flow velocity of the fluid on the left and right sides different, making the movable plate a kind of flip-flop. phenomenon, and is movably displaced so as to reduce the opening on the vortex generation side.

Furthermore, if a vortex is generated on the opposite side of the vortex generator, the movable plate member is movably displaced in the opposite direction about the bearing by a similar effect.

Therefore, the Karman vortex generated in proportion to the flow of fluid can be detected by the movable displacement of the movable plate around the bearing, so the detection means is extremely simple and reliable, and the bearing means can be freely selected. Therefore, the movable displacement of the movable plate can be implemented as a desired configuration such as rotation or flexible deformation.

Furthermore, the size, shape, and even material of the movable plate attached to one side of the vortex generator with a gap may be selected depending on the type of fluid to be tested, measurement accuracy, etc. When machining bearings to install the movable plate.

Since it is only necessary to form an opening for detecting a vortex between the vortex generator and the movable plate, manufacturing is easy and mass productivity can be achieved.

Furthermore, according to the present invention, the movable displacement of the movable plate is detected by a detection mechanism that is a combination of a movable detection element attached to the movable plate and a fixed detection element provided in an isolated or separated position. It has many features such as the ability to use any detection means of your choice.

[Brief explanation of the drawing]

1 to 8 are perspective views and sectional views of essential parts showing numerous embodiments of the vortex flowmeter according to the present invention. FIG. 9 is an explanatory diagram of the entire vortex flowmeter described above, and FIG. 10 is an explanatory diagram showing an operating state. a... Vortex generator of vortex flowmeter A, b...
Movable plate body, C...Bearing mechanism, dly d2
. . . Openings for detecting vortices formed on both sides of the movable plate body and communicating with the air gap G. )f...Movable detection element f1 and fixed detection element f2
A detection mechanism consisting of

Claims (1)

[Claims] 1. A movable plate having a plane perpendicular to the direction of fluid flow is placed on a desired surface of the vortex generator by a desired bearing means parallel to the axis of the vortex generator to create a gap between the movable plate and the vortex generator. A set of detection mechanisms are installed at desired locations separated from or apart from the movable plate including bearing means that moves by the vortex, and the movable plate is pivotably supported so as to be movable in accordance with the detection of the vortex. A vortex flowmeter that can detect left and right movement by detecting vortices in a plate.