JPH0214657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ball valve incorporating a resistivity cell.

In systems that handle pure water, a control method is often used in which ball valves are opened and closed based on the measurement results of a resistivity cell that measures the purity of pure water. In this case, conventionally, the resistivity cell and the ball valve were installed separately, resulting in the following drawbacks.

(1) Requires a lot of space.

(2) There is a time difference between when the resistivity cell feels it and when the ball valve opens and closes.

The present invention is aimed at solving the above-mentioned drawbacks.
It is an object of the present invention to provide a ball valve with a built-in resistivity cell that can save space and solve the problem of time differences.

Embodiments of the invention will now be described with reference to the drawings.

FIG. 1 is a front sectional view showing an embodiment of a ball valve with a built-in resistivity cell according to the present invention. In the figure, 1 is a ball valve, and 2 is a resistivity cell built into the ball valve 1. As shown in FIG.

The ball valve 1 includes a valve case 3 and a spherical valve body 4 rotatably held within the valve case 3.
It becomes more. The valve case 3 includes a water supply hole 5, a drainage hole 6 concentric with the water supply hole 5, and a small-diameter blowhole 7. The valve body 4 includes a through hole 8 that can communicate with the water supply hole 5 and the drain hole 6, a small diameter communication hole 9A that always communicates with the blowhole 7, and a small diameter communication hole 9B that can communicate with the water supply hole 5. ing. The valve case 3 and the valve body 4 are made of an insulating material.

The specific resistance cell 2 consists of a cylindrical external electrode 10 and an internal electrode 12 inserted into the center of the external electrode 10 while being held by an insulating member 11.
0 and 12 are connected to the power supply 15. The external electrode 10 is rotatably supported by the valve case 3 around an axis perpendicular to the center lines of the water supply hole 5 and the drain hole 6, and its tip is fitted and fixed to the valve body 4.
The external electrode 10 is provided with large diameter water holes 13, 13 that communicate with the through hole 8, and a communication hole 14 that communicates with the communication hole 9B. This resistivity cell 2 is
It is driven by a drive source such as a motor (not shown) that is activated based on the measurement results of the resistivity cell 2, and rotates together with the valve body 4.

The configuration of the ball valve with a built-in resistivity cell is as described above, and its operation will be explained next.

FIG. 1 shows a valve open state in which the water holes 13, 13 of the external electrode 10 communicate with the water supply hole 5, and the drain hole 6. In this state, the communication holes 9B, 14 are the water supply holes 5,
The water that is outside the drain hole 6 and flows into the valve from the water supply hole 5 passes through the water holes 13 and 13 and is discharged to the drain hole 6, while a portion of the water in the external electrode 10 flows into the communication hole 9A. and is discharged from the blowhole 7.

In this state, if the purity of the flowing water decreases, the resistivity cell detects this. When the purity decrease exceeds a predetermined amount, the resistivity cell sends a signal to a driving source (not shown), which operates to rotate the external electrode 10 by 90 degrees as shown in FIG. 2, closing the valve. do. In this state, the through hole 8 is separated from the water supply hole 5 and the drainage hole 6, but the communication hole 14 communicates with the water supply hole 5 via the communication hole 9B. Therefore,
Even in this state, a small amount of water is supplied into the external electrode 10, and this water passes through the communication hole 9A to the blowhole 7.
is discharged from.

In this way, even when the valve is closed, a small amount of water is flowing through the external electrode 10, so the resistivity cell continues to detect the purity of water.

When the water purity increases again, the resistivity cell detects this and activates the drive source, the external electrode 10 returns to its original position and water flow is resumed.

Note that it is also possible to send a signal generated by the resistivity cell when detecting a decrease in the purity of water to an alarm device in addition to the drive source of the external electrode 10 to issue an alarm.

As described above, according to the present invention, a resistivity cell is built into the ball valve, and the valve body opens and closes the valve by detecting the purity of water at the valve body, which saves space and , it is possible to solve the problem of time difference caused by the distance between the conventional valve installation location and the resistivity cell installation location.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing the valve open state of an embodiment of the ball valve with a built-in resistivity cell according to the present invention;
Figure 2 is a front sectional view showing the valve in a closed state.
In the figure, 1 is a ball valve, 2 is a resistivity cell, 3 is a valve case, 4 is a valve body, 5 is a water supply hole, 6 is a drainage hole, 7 is a blowhole, 8 is a through hole, 9A, 9
B, 14 are communication holes, 10 is an external electrode, 12 is an internal electrode, and 13 is a water inlet.

Claims (1)

[Scope of Claims] 1. A valve case having a water supply hole and a drainage hole facing each other on both sides and a blowhole at the center of the bottom, which is rotatably held within the valve case and can communicate with the water supply hole and the drainage hole. A valve body is provided with a through-hole for water passage, and the valve body is rotatably supported by the valve case around an axis perpendicular to the center line of the water supply hole and the drainage hole while maintaining electrical insulation, and the tip thereof is connected to the valve body. It consists of a cylindrical external electrode that is fitted and fixed while maintaining electrical insulation, and an internal electrode that is fixed within the external electrode while maintaining electrical insulation from the external electrode, and each electrode is connected to a power source. a specific resistance cell, which operates in response to a change in the composition of water detected by the specific resistance cell to drive the external electrode, and connects the valve body with the water passage through hole communicating with the water supply hole and the drainage hole. The valve body has a drive means for positioning the valve in an open position and a valve closed position in which the water passage through hole does not communicate with the water supply hole and the drain hole, and the valve body has a first drive means that communicates with the water supply hole when the valve is closed. a communication hole, and a second communication hole that is provided on the rotation center of the external electrode and always communicates with the blowhole, and the external electrode has a communication hole that communicates with the first communication hole; A ball valve with a built-in resistivity cell, characterized in that a water passage hole is provided at a position communicating with the water passage through hole.