JPH084917A - Ball valve - Google Patents

Abstract

PURPOSE:To provide an inexpensive ball valve with small water flowing noise capable of suppressing the water flowing noise by a simple structure. CONSTITUTION:A ball 2 to be rotated around the rotational axis (w) is placed in a valve casing 1, a valve hole 20 which is through in the direction orthogonal to the rotational axis (w) is opened in the ball 2, and a small diameter through hole 5 passing through the inner wall of the valve hole 20 from the circumferential surface of the ball 2 is opened in a bypass manner to the valve hole 20 at an intermediate position in the rotational direction of the ball 2 around the rotational axis (w) on the circumferential surface of the ball 2 and between an opening part of the valve hole 20 on one end side and an opening part on the other end side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve body in which a valve body is formed by a ball having a valve hole penetrating through an axial center thereof, and the ball is incorporated into a valve box having an inlet and an outlet. By rotating with the turning axis line in the direction orthogonal to the axis of the hole,
The present invention relates to an improvement of a ball valve which can obtain opening and closing operations.

[0002]

2. Description of the Related Art A ball valve A is usually provided in a cylindrical valve box 1 having an inflow port 10 at one end and an outflow port 11 at the other end, as shown in FIG. A valve chamber 1a communicating with the inflow port 10 and the outflow port 11 is provided, and the ball 2 is provided therein with a rotation axis w in a direction orthogonal to the axial direction of the valve box 1.
And an annular valve seat that slidably contacts the peripheral surface of the ball 2 on the inner wall surface of the valve chamber 1a at the communicating portion to the inlet 10 side and the communicating portion to the outlet 11 side. Three
The ball 2 has a valve hole 20 extending along the direction connecting the centers of the center holes 30 of the pair of valve seats 3 and 3 and the center of the ball 2. The lower end side of the drive shaft 4 which is installed so as to penetrate therethrough and whose axis is aligned with the above-described rotation axis w is connected to the upper surface side of the ball 2, and the upper end side of the drive shaft 4 is connected to the valve. It is configured by projecting above an assembly seat 1b provided on the upper surface side of the box 1 and connecting to an output shaft m of a motor M with a reduction mechanism that is assembled to the assembly seat 1b. 2 is rotated by 90 degrees from the state shown in FIG. 2 by rotating the drive shaft 4 under the control of the operation of FIG. 2 and the center hole 30 and the valve seat 3 of the valve seat 3 where the valve hole 20 faces as shown in FIG. The valve is opened by bringing it into communication with the central hole 30 of the motor. Lumpur 2 is rotated relative to the central bore 30, 30 of the valve seat 3, 3 as in FIG. 2 the peripheral surface of the ball 2 are to be closed by the state of bonding.

In the ball valve A thus constructed, when the ball 2 is rotated to open and close the valve, the opening and closing timings of the ball 2 or the rotation angle of the ball 2 are controlled. When the opening ratio of the openings 21 and 22 of the valve hole 20 to the central holes 30 and 30 of the valve seat 3 and 3 is adjusted to be small to reduce the flow rate, there is a problem that a large running water noise is generated.

As a result, as shown in FIG. 3, the valve hole 20 provided in the ball 2 has one of the front and rear edges in the direction of rotation of the ball 2 that extends in a taper shape in the direction of rotation. The ball 2 is formed into a special shape so as to come out, and the ball 2 is rotated to rotate the ball hole 20 with respect to the center hole 30 of the valve seat 3.
When the opening ratio is narrowed, a change is made in the opening ratio so that the flow noise generated when the flow rate is narrowed is suppressed to a low level.

[0005]

In the ball valve A, the shape of the valve hole 20 opened so as to form a flowing water passage in the ball 2 is controlled in order to suppress the flowing water noise generated when the flow rate is reduced. The means for forming the special shape so that the trailing edge side in the turning direction of the ball 2 has a tapered shape is effective in reducing the flow noise, but the valve hole 20 is Since it is difficult to perform processing for opening a special shape, there is a problem that the manufacturing cost is high and the cost is high.

The present invention has been made in order to solve the problem that has occurred in the means for suppressing the running water noise in the conventional ball valve, and the running water noise can be suppressed by simple processing. An object of the present invention is to provide a new means for obtaining a ball valve with low running noise at low cost.

[0007]

As a means for achieving this object, the present invention provides a spherical valve chamber in a valve box having an inflow port and an outflow port. In the part communicating with the inlet and the part communicating with the outlet,
Annular valve seats each having a central hole are provided so as to face each other, and a ball that rotates with a rotation axis is inserted into the valve chamber, and the ball has a valve hole that penetrates in a direction orthogonal to the rotation axis. At the same time as the opening, on the peripheral surface of the ball, at an intermediate portion in the rotation direction of the ball along the rotation axis between the opening on the one end side and the opening on the other end side of the valve hole,
A ball valve is characterized in that a small-diameter through hole that penetrates from the peripheral surface of the ball to the inner wall of the valve hole is opened in a bypass shape with respect to the valve hole.

[0008]

The ball valve according to the present invention thus constructed has a valve hole 20 which is opened to form a flowing water passage in the ball 2.
To the ball 2 of the normal ball valve A
As in the case of 0, since the cross section may be formed into a perfect circle, the machining work for cutting the valve hole 20 is significantly simplified. Then, on the peripheral wall of the ball 2, at the intermediate portion between the opening 21 on one end side and the opening 22 on the other end side of the valve hole 20 opened so as to penetrate the ball 2, the circumference of the ball 2 is formed. A small diameter bypass hole 5 provided so as to communicate between the surface and the intermediate portion of the valve hole 20 in the flow path direction.
However, when the ball 2 is rotated and the opening ratio of the opening portion of the valve hole 20 is reduced to be small, the ball hole 20 communicates with the central hole 30 of the valve seat 3 on the outlet 11 side. In this state, the opening area of the valve hole 20 on the outflow port 11 side is increased by the amount of the small-diameter through hole 5 to make the flow velocity gentle.
The running water noise will be reduced. Also, at the time of opening when the valve is opened from the closed state, the small-diameter through hole 5 similarly increases the opening area of the valve hole 20 on the side of the outflow port 11 to reduce the flow velocity and reduce the flow noise. To suppress the occurrence of.

The bypass-shaped small-diameter through hole 5 is provided.
Since the cross-sectional shape may be a perfect circle, it can be opened by a simple cutting process like the valve hole 20 used as a flowing water channel.
The whole thing can be made cheaply.

[0010]

Embodiments Next, embodiments will be described in detail with reference to the drawings. The same reference numerals are used for the components having the same effects as those of the conventional ones.

FIG. 4 is a partially cutaway side view of the ball valve A in which the means of the present invention is implemented in a closed state. 1 is a valve box, 10 is an inlet, 11 is an outlet, 1a is a valve chamber, 2 is a ball charged in the valve chamber 1a, 20 is a valve hole formed in the ball 2 so as to form a flowing water channel, 3.3 is a valve seat, 30.3
0 is a central hole of the valve seats 3 and 4, 4 is a drive shaft for rotating the ball 2, M is a motor for driving and rotating the drive shaft 4,
Reference numeral 5 denotes a bypass-shaped through hole provided in the ball 2.

The valve box 1 is a conventional one having an inflow port 10 on one end side and an outflow port 11 on the other end side, and is formed in a cylindrical shape. A spherical valve chamber 1a is formed, and a ball 2 is formed on the upper surface side.
An assembling seat 1b for assembling the motor M for driving the drive shaft 4 for rotating is formed.

The ball 2 is a valve chamber 1 having a spherical outer diameter.
It is formed into a spherical shape corresponding to the inner diameter of a, and is inserted into the valve chamber 1a so as to freely rotate with a rotation axis w in the vertical direction orthogonal to the axial direction of the valve box 1, and the axial core wire is provided on the upper surface side. An assembly seat 1 in which a lower end portion of the drive shaft 4 coinciding with the rotation axis w is connected, and an upper end side of the drive shaft 4 is formed on an upper surface side of the valve box 1.
By projecting to the upper surface of b and connecting to the output shaft m of the motor M mounted on the mounting seat 1b, it is possible to rotate with the above-mentioned rotation axis w by the operation of the motor M, and The formation of the lateral valve hole 20 along the axial direction of the ball through the center of the ball 2 and penetrating the ball 2 is the same as the conventional electric proportional valve type ball. Further, the valve hole 20 is formed in a shape having a perfect circle in cross section, like the valve hole 20 in the ball 2 of the ordinary ball valve A.

The valve seats 3 and 3 are formed in an annular shape, and are arranged so as to face each other on the side facing the inflow port 10 and the side facing the outflow port 11 of the valve chamber 1a as shown in FIG. It is assembled to the valve box 1, and the inner peripheral surfaces thereof are formed into an arcuate surface that is in sliding contact with the peripheral surface of the ball 2.

As a result, the ball 2 is rotated so that the opening 21 on one end side of the valve hole 20 faces the central hole 30 of the valve seat 3 on the inlet 10 side, and the opening 22 on the other end side is opened. By making it face the central hole 30 of the valve seat 3 on the outlet 11 side, the water flow flowing into the valve box 1 from the inlet 10 is
A state in which the valve 2 is opened through the water passage formed in the valve hole 20 to the side of the outlet 11 and the ball 2 is rotated 90 degrees in the opposite direction from this state, is again shown in FIG. In this state, the valve is closed.

As shown in FIG. 5, the bypass-shaped small-diameter through hole 5 is formed on the peripheral surface of the ball 2 so that the opening 21 on one end side and the opening on the other end side of the valve hole 20 formed in the ball 2 are formed. Part 22
As shown in FIG. 6, at an intermediate portion between and, along the direction orthogonal to the axis of the valve hole 20, from the peripheral surface of the ball 2 to the valve hole 2
It is shaped so as to reach the inner wall surface of 0.

The bypass-shaped small-diameter through hole 5 is formed so that the inner diameter thereof is significantly smaller than the inner diameter of the valve hole 20. In the embodiment, the inner diameter of the valve hole 20 is 10φ and the through hole 5
The inner diameter of is set to 3φ.

Further, the bypass-shaped small-diameter through hole 5 is
The opening position thereof is, as shown in FIG. 7, just one half of the distance in the circumferential direction of the ball 2 between the opening 21 on the one end side and the opening 22 on the other end side of the valve hole 20. position,
It is opened from the center of the ball 2 so as to be perpendicular to the axis of the valve hole 20.

However, the opening position of the small-diameter through hole 5 of the bypass shape and the angle with respect to the axial center line of the valve hole 20 in plan view depend on the relationship between the diameter of the valve hole 20 and the diameter of the central hole of the valve seat 3. It may be set appropriately. That is, as shown in FIG. 8, when the ball 2 is rotated 90 degrees counterclockwise from the correctly closed state to the valve opened state as shown in FIG. 10, and from the state of FIG. As shown in FIG. 9, the opening portion of the through hole 5 is provided at the beginning of the valve opening stroke and the end of the valve closing stroke when the ball 2 is rotated 90 degrees clockwise to be in the valve closed state of FIG. 50 and valve hole 2
The opening 22 of 0 is the central hole 3 of the valve seat 3 on the outlet 11 side.
The central hole 30 of the valve seat 3 of the opening 21 of the valve hole 20 narrowed by the rotation of the ball 2 is exposed to zero.
The opening area (overlap area) with respect to is enlarged by the amount of the through hole 5 on the side of the outlet 11 and the position and angle at which the flow velocity of the flowing water is reduced are set appropriately. Further, although this bypass-shaped small-diameter through hole 5 is one in the embodiment, it may be provided in parallel, and it may be provided only on the side of the peripheral surface of the ball 2 facing the outlet 11. However, it may be provided on the side facing the inflow port 10.

Next, FIG. 11 shows that the diameter shown in FIG.
A ball valve A in which a 0φ valve hole 20 is formed in a ball 2, and a through hole 5 having a diameter of 3φ as shown in FIG.
A ball valve A according to the present invention in which a bypass is provided.
3 is a table showing changes in measured values of water flow noise when the ball 2 is rotated from the fully closed position to the fully open position.
In the figure, the scales on the left and right sides and the numbers attached to them indicate the rotation angle amount of the ball 2 and the number of pulses (× 10 pulses) that is the energization time of the current passed through the motor M that rotates the ball 2. The position of 0 at the left end is in the state of FIG. 8 and the position of right end 108 is in the state of FIG. 10, and during this period, it is rotated by 90 degrees. The point a is the opening 2 of the valve hole 20 due to the rotation of the ball 2.
1.22 is the central hole 30.30 of the valve seat 3.3.
Shows the position at which the valve starts to open after being overlapped with point B, the point b shows the position at which the valve opening is advanced by the rotation of the ball 2 and the flow rate becomes almost half, and the point c shows the fully opened position. Also,
The vertical scale and the numbers attached thereto in FIG. 11 indicate the magnitude of the measured water flow sound (decibel).

It is said that it is desirable to suppress the water flow sound to 40 decibels or less, because it is almost unnoticeable if it is 40 decibels or less.

By the way, as is apparent from FIG. 11 described above, in the conventional means, in the zone Z1 which is the turning range in which the flow rate is narrowed, the sound of water flow suddenly rises above 40 decibels. On the other hand, in the case of the means of the present invention, the result is that the water flow noise in the zone Z1 where the flow rate is narrowed can be suppressed to 40 decibels or less.

Further, in the zone Z2 in which the flow rate at which the water flow noise is maximized is reduced to half, the conventional means is 55.
In contrast to the value close to decibel, in the case of the means of the present invention, a value close to about 50 decibel which is lower by about 5 decibel is shown, showing that the means of the present invention is effective in reducing water flow noise. There is.

[0024]

As described above, in the ball valve A according to the present invention, the valve hole 20 formed in the ball 2 and the small-diameter through hole 5 formed in a bypass shape with respect to the valve hole 20 are combined. By so doing, the water flow noise that greatly occurs when the flow rate is reduced is suppressed to a low level, so that the valve hole 20 formed in the ball 2 does not need to be formed in a special shape, and the normal valve hole 20 The bypass small-diameter through hole 5 may be formed as a normal hole having a perfect circle in cross section, so that the processing is significantly facilitated and the water flow noise is low. The ball valve can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a conventional ball valve in a valve open state.

FIG. 2 is a partially cutaway side view of the above ball valve in a closed state.

FIG. 3 is a side view of a ball of a ball valve provided with means for reducing water flow noise.

FIG. 4 is a partially cutaway side view of the ball valve according to the present invention in a closed state.

FIG. 5 is a side view of a ball of the above ball valve.

FIG. 6 is a front view of a ball of the above ball valve.

FIG. 7 is a cross-sectional plan view of a ball of the above ball valve.

FIG. 8 is a cross-sectional plan view of a main part of the above ball valve in a closed state.

FIG. 9 is a cross-sectional plan view of the main part of the above ball valve during the valve opening stroke.

FIG. 10 is a horizontal cross-sectional plan view of a main part of the above ball valve when the valve is open.

FIG. 11 is an explanatory view of the operation of the above ball valve.

[Explanation of symbols]

A ... Ball valve, M ... Motor, m ... Output shaft, w ... Rotation axis, Z1, Z2 ... Zone, 1 ... Valve box, 1a ... Valve chamber,
1b ... Assembly seat, 10 ... Inflow port, 11 ... Outflow port, 2 ... Ball, 20 ... Valve hole, 21/22 ... Opening part, 3 ... Valve seat, 30
... central hole, 4 ... drive shaft, 5 ... through hole, 50 ... opening.

Claims (1)

[Claims] 1. A spherical valve chamber 1a is provided in a valve box 1 having an inlet 10 and an outlet 11, and a portion communicating with the inlet 10 and a portion communicating with the outlet 11. , Annular valve seats 3, 3 each having a central hole 30 are provided in opposition to each other, and a ball 2 which rotates with a rotation axis w is inserted into the valve chamber 1a, and the ball 2 is rotated by the above-mentioned rotation. A valve hole 20 penetrating in a direction orthogonal to the axis w is opened, and the rotation axis w of the opening 21 on the one end side and the opening 22 on the other end side of the valve hole 20 is formed on the peripheral surface of the ball 2.
A small-diameter through hole 5 that penetrates from the peripheral surface of the ball 2 to the inner wall of the valve hole 20 is formed in an intermediate portion in the rotation direction of the ball 2 by bypassing the valve hole 20. Ball valve.