JPH07260026A - Flow adjusting device - Google Patents

Abstract

PURPOSE:To obtain a flow adjusting device wherein pressure-flow rate curved line shows steep rising. CONSTITUTION:In a flow adjusting device composed of a core member 3 wherein a plurality of blade-like protrusions 31 are axially provided oh the outer periphery, elastic rings 2 arranged on the periphery of the core member 3, and a casing into which the core member 3 and the elastic rings 2 are fitted, and provided with an opening through which fluid is made pass in the axial direction of the core member 3, a ridge line L1 on the blade-like protrusion tip is forwardly inclined in the passing direction of the fluid in relation to the axial direction L2 by the specific angle THETA. The angle of the line of ridge on the blade protrusion tip is changed, thereby the specific flow rate can be made in the small pressure range, and the application for a flow adjusting device requiring steep rising is made possible. Moreover, the advantage wherein the flow adjusting device having the desired pressure-flow rate curved line can be easily manufactured is generated by measuring the relationship between the angle of the line of image and the rising of the flow rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate control device, and more particularly to a flow rate control device capable of quickly responding to a predetermined flow rate in response to a fluid pressure load.

[0002]

2. Description of the Related Art As shown in the sectional view of FIG. 6, a flow rate adjusting device has a stepwise cross section, and an elastic ring 2 is arranged in a casing 1 having an upper opening 11 and a lower opening 12, and this casing is also used. 1 has a structure in which the core member 3 is fitted through the lower opening 12 (Japanese Examined Patent Publication No. 51-
23060).

The core member 3 has a plurality of wing-shaped projections 31 (see FIGS. 2 and 3) in the circumferential direction, and the elastic ring 2 surrounds the wing-shaped projections 31. ing.

When a predetermined fluid pressure is applied to the flow rate adjusting device from the direction of the lower opening 12, the elastic ring 2 and the wing-shaped projection 31 and the recess 33 formed by the elastic ring 2 and the wing-shaped projection 31 are pressed. The fluid flows, and the flow rate increases substantially in proportion to the fluid pressure (the range indicated by the arrows in the flow rate-pressure curves of the solid line and the broken line in FIG. 4).

When the fluid pressure further increases, the elastic ring 2
Deforms in the direction of the core member 3. At this time, since the wing-shaped projections 31 are provided on the outer periphery of the core member 3, the elastic ring 2 is deformed along the outer shape of the wing-shaped projections 31, and the elastic ring 2, the recess 33 and the wing-shaped projections 31 are separated. After the fluid flow path is formed in the gap 34, and after reaching the predetermined flow rate, the elastic ring is increased or decreased in the gap 34 in response to the resultant force of the hydraulic pressure fluctuation and the hydrodynamic force of the fluid toward the core member. As a result, the flow rate can be stabilized with a constant adjustment width.

On the other hand, when the fluid pressure decreases, the cross-sectional area of the gap 34 increases due to the restoring force of the elastic ring 2 and the fluid flow path widens, so that a constant flow rate can be secured.

In the flow rate adjusting device as described above, it has been conventionally known that the fluid pressure-flow rate relationship draws a gentle curve as shown by the broken line in FIG. That is, until reaching the predetermined flow rate, the flow rate gradually increases, if not proportionally, with the increase of the fluid pressure, and after the equivalent pressure increases, it reaches the predetermined flow rate, and then there is a pressure fluctuation. On the contrary, the flow rate is almost stabilized.

In the flow rate adjusting device having the smooth rising portion as described above, it is necessary to raise the corresponding pressure to obtain a predetermined flow rate. Depending on the application required for industrial or household use, for example, a sharp rise as shown by the solid line in FIG. 4 (the proportional portion of the flow rate-pressure is narrow), that is, a predetermined flow rate is achieved within a small pressure range. There has been a demand for a new flow control device.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a flow rate adjusting device in which a pressure-flow rate curve shows a steep rise.

[0010]

In order to achieve the above-mentioned object, a flow rate adjusting device according to the present invention is arranged around a core member having a plurality of wing-shaped projections on its outer periphery in the axial direction and around this core member. In a flow rate adjusting device comprising an elastic ring and a casing having such a core member and the elastic ring fitted therein, and having an opening for allowing passage of a fluid in the axial direction of the core member, a ridgeline of the tip end portion of the wing-shaped projection. Is inclined forward by a predetermined angle Θ in the fluid passage direction with respect to the axial direction.

The present inventor has found that the rise of the flow rate with respect to the fluid pressure can be made rapid by changing the angle of the ridgeline at the tip of the wing-shaped projection. The present invention can be applied to a flow rate control device that requires a sharp rise as described above. Further, by measuring the relationship between the angle of the ridge and the rise of the flow rate, there is an advantage that a flow rate adjusting device having a desired pressure-flow rate curve can be easily manufactured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view of a flow rate adjusting device of the present invention, and FIG.
FIG. 3 is a plan view and FIG. 3 is a bottom view. As is apparent from this embodiment, the flow rate adjusting device includes a casing 1 having an upper opening 11 and a lower opening 12, and an elastic ring 2
And the lower opening 1 of this casing 1
The core member 3 has a structure in which the core member 3 is fitted together.

The core member 3 has a plurality of wing-shaped projections 31 (see FIGS. 1, 2 and 3) in the circumferential direction thereof, and the elastic ring 2 surrounds the outer circumference of the wing-shaped projections 31. It is structured.

When a predetermined fluid pressure is applied to such a flow rate adjusting device from the direction of the lower opening 12, as is apparent from FIG. 1 which is a sectional view taken along the line AA of FIG. Fluid flows between the elastic ring 2 and the recess 33 formed by the wing-shaped projections 31, and the flow rate increases in proportion to the fluid pressure (indicated by the arrow in the solid-line flow rate-pressure curve in FIG. 4). range).

When the fluid pressure further increases, the elastic ring 2
Deforms in the direction of the core member 3. At this time, since the wing-shaped projections 31 are provided on the outer periphery of the core member 3, the elastic ring 2 starts to deform gradually along the outer shape of the wing-shaped projections 31. Further, when the pressure is increased, the fluid passage of the gap 34 formed inside the elastic ring is gradually narrowed, and when the flow rate reaches a predetermined value or more, it exerts an adjusting function for water pressure fluctuation, The flow rate becomes almost constant near a predetermined value (in FIG. 4, a range other than the solid arrow).

In the present invention, the ridgeline 32 (corresponding to the line L1) at the tip of the wing-shaped projection 31 is set at a predetermined angle in the fluid passage direction with respect to the axis L2 (angle of the line L2 = angle of the line L3) direction. Θ It is leaning forward. That is,
As for the angle Θ between the line L1 and the line L3, the line L1 is the axis L.
It is formed by inclining in two directions. This range depends on the size, shape, etc. of the flow control device, but is 2-3
It was found that there is an optimum angle Θ within 0 °. Θ is 2
If it is less than °, no remarkable change is observed in the fluid pressure-flow rate curve at the rising, while if Θ exceeds 30 °, the flow rate does not reach a constant value as shown by D (shown by the wavy line) in Fig. 5. Cannot be used.

As described above, the ridgeline 32 at the tip of the wing-shaped projection 31 is formed.
It is possible to realize a fluid pressure-flow rate curve having a shape (a steep rise) in which the flow rate sharply increases with respect to the initial pressure by inclining (the fluid pressure-flow rate curve of the solid line in FIG. 4). .

As a concrete example, d1 = 10.5 mm, Θ =
As a result of measuring a fluid pressure-flow rate curve using an 8 ° core member, the results shown in FIG. 5 were obtained. A solid line C is a fluid pressure-flow rate curve of the pressure adjusting device of the present invention, and a broken line A is a fluid pressure-flow rate curve of a conventional pressure adjusting device (Θ = 1.5 °). As is clear from this figure, in the pressure regulator according to the present invention, the rise of the fluid pressure-flow rate curve is steep,
It is possible to reach a given flow rate with less pressure.

According to the present invention, various fluid pressure-flow rate curves of the shape of the wing and the angle of the ridge are measured,
In designing the flow rate adjusting device as described above and providing a desired rising curve, there is an advantage that it can be executed very easily.

[0020]

As described above, the flow rate adjusting device according to the present invention can achieve a predetermined flow rate in a small pressure range by changing the angle of the ridgeline at the tip of the wing-shaped projection. The present invention can be applied to a flow rate control device that requires such a sharp rise. further,
According to the present invention, by measuring the relationship between the angle of the ridge and the rise of the flow rate, there is an advantage that a flow rate adjusting device having a desired pressure-flow rate curve can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view taken along the line AA in FIG. 2 showing an embodiment of a flow rate adjusting device according to the present invention.

FIG. 2 is a plan view of the embodiment.

FIG. 3 is a bottom view of the embodiment.

FIG. 4 is a diagram schematically showing the relationship between fluid pressure and flow rate.

FIG. 5 is a measurement diagram of a relationship between fluid pressure and flow rate.

FIG. 6 is a sectional view of a conventional pressure adjusting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 11 Upper opening 12 Lower opening 2 Elastic ring 3 Core member 31 Feather-shaped projection 32 Ridge line

Claims (1)

[Claims] 1. A core member having a plurality of wing-shaped projections on its outer circumference in the axial direction, an elastic ring arranged around the core member, and such a core member and an elastic ring are fitted into the core member, In a flow rate adjusting device including a casing having an opening for passing a fluid in an axial direction, a ridgeline of the tip end portion of the wing-shaped projection is inclined forward by a predetermined angle Θ in the passage direction of the fluid with respect to the axial direction. Flow rate adjusting device characterized by.