JPH09303581A - Fluid control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen an adjustment range and smoothly and delicately adjust a flowrate change per ball valve angle by forming one or more peripheral grooves on the external surface of a ball valve laid inside a ball valve box, so as to communicate fluid inlet and outlet nozzles to each other along the rotating direction of the ball valve. SOLUTION: A fluid inlet nozzle 4 and a fluid outlet nozzle 5 are respectively provided on the side and the lower part of a ball valve box 1a. On the other hand, an external surface groove 7 is formed on the surface of a ball valve 2 within the range of 270 degrees, with breadth gradually reduced from a maximum expanded part at the end along the rotating direction of the valve 2. The valve 2 is wide open, when the maximum expanded part thereof is at the open part of the fluid inlet nozzle 4, but when the valve 2 rotates and the external surface groove 7 passes the open part, the open part comes to have a small degree of opening, and as a result, a flowrate passing the valve 2 is reduced correspondingly. In this case, the degree of the opening is adjustable within the 270-degree rotation range of the valve 2, thereby allowing the delicate adjustment of a flowrate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid control device in which the flow rate can be finely adjusted by providing a groove for connecting a fluid inlet / outlet nozzle along the rotation direction on the outer periphery of a spherical valve.

[0002]

2. Description of the Related Art Conventionally, as a fluid control device using a spherical valve, a spherical valve is installed inside a spherical valve box having a fluid inlet / outlet nozzle, and the spherical valve has an interior as shown in FIG. It is known that a communication path a for a fluid inlet / outlet nozzle is provided therethrough, and a triangular window b is provided at the entrance of the communication path a, the diameter of which is reduced along the rotation direction of the spherical valve.

[0003]

In this fluid control device, the diameter of the triangular window b provided at the entrance of the communication passage a is reduced in the rotational direction of the spherical valve. Accordingly, when the triangular window passes through the fluid inlet nozzle, the opening degree of the triangular window is temporarily reduced, and the fluid is adjusted according to the opening degree.

That is, the flow rate of the fluid is adjusted while the triangular window passes through the fluid inlet nozzle with the rotation of the spherical valve. In this fluid control device, the triangular window is provided at the entrance of a small communication path. In addition, the distance that the triangular window passes through the fluid inlet nozzle with the rotation of the spherical valve is short, and thus the adjustment range is narrow. Therefore, the flow rate per angle of the spherical valve changes greatly, and fine adjustment is difficult.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, according to the present invention, a spherical valve is installed inside a spherical valve box having a fluid inlet / outlet nozzle, and the outer periphery of the spherical valve extends along the rotation direction of the spherical valve. In addition, the present invention proposes a fluid control device provided with one or more outer peripheral grooves for connecting the fluid inlet / outlet nozzle.

[0006]

In the present invention, the flow rate of the fluid is adjusted by the opening degree of the outer peripheral groove when the outer peripheral groove of the spherical valve passes through the fluid inlet nozzle with the rotation of the spherical valve. It is formed over a wide range on the outer periphery of the spherical valve along the rotational direction, for example, over a range of 1/2 (180 °) or more of the entire circumference of the spherical valve. ,
Therefore, the flow rate change per angle of the ball valve is made gentle and fine adjustment is possible.

In order to finely adjust the flow rate of the fluid, it is preferable that the width of the outer peripheral groove is formed so as to be reduced or enlarged along the rotation direction of the spherical valve.

In addition to adjusting the width of the outer peripheral groove, the depth of the outer peripheral groove may be adjusted along the rotation direction of the spherical valve for adjusting the fluid flow rate.

Further, in order to adjust the flow of the fluid, a plurality of slits may be formed in the outer circumferential groove along the rotation direction of the spherical valve.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the illustrated embodiment. FIGS. 1 to 3 show an embodiment of the present invention. The spherical valve 3 installed therein is connected to a drive shaft (not shown) of the actuator, and is a valve shaft for rotating the spherical valve 2.

The spherical valve box 1 is provided with a fluid inlet nozzle 4 and a fluid outlet nozzle 5 at the side and the lower part, respectively.

On the other hand, in the outer periphery of the spherical valve 2, an outer peripheral groove 7 whose width is temporarily reduced along the rotation direction of the spherical valve 2 from the largest diameter portion 6 at its end within a range of 270 ° is formed.

In this embodiment, a liquid passage 8 is formed in the spherical valve 2 to connect the largest diameter portion 6 to a fluid outlet nozzle 5 formed below the spherical valve box 1.

Further, a packing 10 is provided between the opening 9 of the fluid inlet nozzle 4 and the outer periphery of the spherical valve 2 to provide a watertight structure.

With the above configuration, when the largest diameter portion 6 of the spherical valve 2 is located at the opening 9 of the fluid inlet nozzle 4, the opening 9 is in a fully open state, but the spherical valve 2 rotates to rotate the outer periphery. Groove 7
Passes through the opening 9, the opening degree of the opening 9 decreases,
Accordingly, the flow rate passing through the spherical valve 2 decreases.

In this embodiment, the outer periphery of the spherical valve 2
Since the outer peripheral groove 7 is formed in the range of 270 °, and therefore the opening degree of the opening 9 can be adjusted within the range in which the spherical valve 2 rotates by 270 °, the flow rate can be finely adjusted.

FIGS. 4 to 7 show another embodiment of the present invention. In this embodiment, a fluid inlet nozzle 4 and a fluid outlet nozzle 5 are provided at right angles to the side of a spherical valve box 1, respectively. Have been.

An outer circumferential groove 7 is formed in the outer periphery of the spherical valve 2 in the range of 270.degree. From the largest diameter portion 6 at its end along the rotation direction of the spherical valve 2 so as to temporarily reduce its width.

In the above embodiment, the degree of opening of the opening 9 can be adjusted within the range of 270 ° of the spherical valve 2 in the same manner as in the embodiment of FIG. 1. In the range of A, as shown in FIG. The opening 9 is fully open, but in the range of B to B ′, the opening degree of the opening 9 decreases as shown in FIG. 5 (B), and the opening 9 is completely closed at B ′. The flow rate through valve 2 is regulated.

FIGS. 8 to 11 show still another embodiment of the present invention. In this embodiment, two fluid inlet nozzles 4 and 4 and a lower portion of the spherical valve 1 are provided on both sides of the spherical valve box 1. Is provided with a fluid outlet nozzle 5.

Further, two sets of outer circumferential grooves 7 are formed on the outer circumference of the spherical valve 2 so as to face each other, and a plurality of slits 11 are formed in the outer circumferential grooves 7 along the rotation direction of the spherical valve 2. .

In the above embodiment, the fluid flows from the two fluid inlet nozzles 4 and 4 into the spherical valve 2 and flows out from the fluid outlet nozzle 5. 7 and 7, two sets of outer circumferential grooves 7 and 7 are formed with the two fluid inlet nozzles 4 and 4 as the spherical valve 2 rotates.
The opening degree of the opening when passing through the opening is changed, and the flow rate adjusted according to this opening is discharged from the fluid outlet nozzle 5.

The fluid flows into the outer peripheral grooves 7, 7 in the spherical valve 2.
In this embodiment, since the plurality of slits 10 are formed in the outer peripheral grooves 7, 7, the fluid passing through the outer peripheral grooves 7, 7 flows according to the slit 11, and therefore, in this embodiment, the spherical valve 2 The flow of the fluid flowing inside can be adjusted.

[0024]

In summary, according to the present invention, the outer peripheral groove of the spherical valve is provided along the rotation direction, and the opening degree of the fluid inlet nozzle is adjusted by the outer peripheral groove. It can be carried out.

Further, by adjusting the width, depth, length, etc. of the outer peripheral groove, the flow rate characteristics can be freely controlled.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention.

FIG. 2 is a longitudinal side view of the same.

FIG. 3 is a perspective view of a spherical valve used in the embodiment.

FIG. 4 is a partially cutaway perspective view showing another embodiment of the present invention.

FIG. 5 is a cross-sectional plan view of the above.

6A and 6B show the state of opening of the fluid inlet nozzle in the embodiment of the above, wherein FIG.
FIG. 7 is a view showing that the opening degree of the fluid inlet nozzle is in a range of B ′ in a state of being reduced

FIG. 7 is a perspective view of a spherical valve used in the embodiment.

FIG. 8 is a schematic view showing still another embodiment of the present invention.

FIG. 9 is a perspective view of a spherical valve used in the embodiment.

FIG. 10 is a sectional view taken along the line XX of the above.

FIG. 11 is a sectional view taken along the line YY of the above.

FIG. 12 is a perspective view of a conventional spherical valve.

[Explanation of symbols]

 1 is a spherical valve box 2 is a spherical valve 3 is a valve shaft 4 is a fluid inlet nozzle 5 is a fluid outlet nozzle 6 is a largest diameter portion 7 is an outer circumferential groove 8 is a liquid passage 9 is a fluid inlet nozzle opening 10 is a packing 11 slit

Claims (4)

[Claims] 1. A spherical valve is installed inside a spherical valve box having a fluid inlet / outlet nozzle, and one or more of the spherical valve is connected to the outer periphery of the spherical valve along the direction of rotation of the spherical valve. A fluid control device having an outer peripheral groove. 2. The fluid control device according to claim 1, wherein the width of the outer peripheral groove is reduced or enlarged along the rotation direction of the spherical valve. 3. The fluid control device according to claim 1, wherein the depth of the outer peripheral groove is adjusted along the rotation direction of the spherical valve. 4. The fluid control device according to claim 1, wherein a plurality of slits are formed in the outer peripheral groove along the rotation direction of the spherical valve.