JPS6236511Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for detecting liquid leakage caused by incomplete closure of a valve for discharging liquid when the valve is closed.

For intermittent liquid supply from the liquid storage tank and drainage from the ion-exchange resin tower, the valve installed in the discharge pipe is opened and closed as necessary, and the flow rate per unit time is reduced once the liquid passes through the discharge pipe via the liquid storage tank. The liquid is supplied and discharged so that it is appropriate. After the liquid is supplied and drained, the valve is completely closed to stop the liquid from flowing out. However, if the valve is incompletely closed or the valve seat is damaged, liquid leaks through the valve. However, even if the amount of leakage is small, if it continues, it often causes problems with product quality, hygiene, and pollution.

FIG. 1 shows a conventional liquid leakage detection device for a discharge valve, and FIG. 1A is a partially cutaway front view thereof, and FIG. 1 is a cross-sectional view taken from FIG. In the figure, 1 is a liquid storage tank such as a piano box, 2 is a weir plate, 3 is a liquid passage hole, 4 is a discharge pipe, 5 is a valve, and 6 is a drain pipe. Open the valve 5 and pass the liquid through the discharge pipe 4 to the liquid storage tank. When the liquid is discharged from the piano box 1, the liquid level on the drain pipe 4 side of the weir plate 2 rises, and the liquid level on the drain pipe 4 side of the weir plate 2 rises, causing the plurality of liquid passage holes 3 of different levels provided in the weir plate 2 to rise. The liquid flows to the drain pipe 6 side of the piano box 1, and the liquid level on the drain pipe 4 side of the piano box 1 is balanced depending on the amount of liquid flowing through the piano box 1. When the valve 5 is completely closed, the liquid level on the discharge pipe 4 side of the piano box 1 drops to the level of the lowest end of the liquid passage hole 3, and the movement of the liquid stops. Therefore, when the valve 5 is not completely closed and there is a large amount of leakage,
Since the liquid is vigorously discharged from the liquid passage hole 3 of the weir plate 2, liquid leakage can be easily detected, but when the amount of liquid leaked is extremely small, a small amount of liquid flows from the lowest liquid passage hole 3 to the liquid drain pipe. There was a drawback that it was not easy to detect leakage because the liquid was only discharged to the side.

The present invention eliminates these conventional drawbacks and makes it possible to easily detect even a small amount of liquid leakage. An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a longitudinal sectional front view showing an embodiment of the liquid leakage detection device for the discharge valve of the present invention, in which 7 is an ion exchange resin tower;
8 is a liquid storage tank, the inside of which is divided into two by a weir plate 9. This weir plate 9 does not have a liquid passage hole like the conventional one, and its upper edge is lower than the upper edge of the liquid storage tank 8. The discharge pipe 4 from the ion exchange resin column 7 is connected to the valve 5.
is inserted from above into one side of the liquid storage tank 8 partitioned by the weir plate 9, and a drain pipe 6 is inserted into the opposite side.
is provided below the bottom of the tank 8. 10 is a siphon pipe, the diameter of which is smaller than the diameter of the discharge pipe, and is installed across the weir plate 9;
One end 11 of the siphon pipe 10 is located on the discharge pipe 4 side of the weir plate 9 at a position higher than the lower end 12 of the discharge pipe 4, and the other end 13 of the siphon pipe 10 is located within the drain pipe 6.
Reference numeral 14 denotes a liquid level detection switch, which is disposed on the discharge pipe 4 side of the liquid storage tank 8 divided by the weir plate 9 so as to be higher than one end 11 of the siphon pipe 10 and lower than the upper end of the weir plate 9. Ru.

Next, the function of this liquid reservoir will be explained.

When the valve 5 is opened to discharge the liquid from the ion exchange resin column 7, the liquid in the column passes through the discharge pipe 4 and accumulates on the discharge pipe 4 side of the weir plate 9 of the liquid storage tank 8, overflowing the weir plate 9. The liquid is discharged from the drain pipe 6. At this time, since the amount of liquid discharged from the column 7 is generally large, one end 13 of the siphon tube 10 is surrounded by liquid and the downward dynamic pressure of the discharged liquid is applied. At that time, the discharge pipe 4 side of the siphon tube 10 is filled with liquid, but the other side is filled with air, but due to the dynamic pressure, the siphon works and the inside of the siphon tube 10 is filled with liquid. Thereafter, in addition to overflowing the weir plate 9, the liquid continues to move by the siphon in the siphon tube 10. Note that when the amount of liquid discharged from the ion exchange resin tower 7 is small, the liquid level on the discharge pipe 4 side of the liquid storage tank 8 may drop to near one end 11 of the siphon pipe 10, depending on the inner diameter of the siphon pipe 10.

Next, when the valve 5 is completely closed, the flow of liquid from the discharge pipe 4 into the liquid storage tank 8 is stopped, so first, the weir plate 9
The overflow stops, and then, due to the action of the siphon tube 10, the liquid level on the discharge tube 4 side falls to the level of one end 11 of the siphon tube, and air enters from the same end, leaving only air in the siphon tube 10 and being discharged. The liquid stops flowing into the liquid pipe 6. If the valve 5 is completely closed, the liquid level is maintained as it is.

If valve 5 is incompletely closed,
Although a small amount of liquid flows into the discharge pipe 4 side of the liquid storage tank 8,
Since the siphon is turned off, the liquid level gradually rises, and when it reaches the liquid level detection switch 14, the switch 14 is activated, and an alarm (not shown), for example, warns that the valve 5 is incompletely closed. Therefore, necessary measures can be taken. Therefore, even if the valve 5 is incompletely closed for a while, it is possible to prevent liquid from continuously flowing into the drain pipe 6. Further, when the amount of liquid leaking is extremely small, the liquid can be stored in the liquid storage tank 8, thereby preventing troubles caused by the mixing of a small amount of liquid. Note that the liquid level detection switch 14 must be operated only when the valve 5 is closed.

As explained in detail above, according to the present invention, liquid leakage due to incomplete closure of a valve can be easily detected with an extremely simple device, and defective products caused by unexpected contamination of liquid can be detected. The effects are great, such as being able to prevent the occurrence of gas, loss of raw materials, etc.

[Brief explanation of the drawing]

Fig. 1 shows a conventional liquid leakage detection device for a discharge valve, A is a partially cutaway front view thereof, and B is a - of Fig. A.
FIG. 2 is a longitudinal sectional front view showing an embodiment of the liquid leakage detection device for the discharge valve of the present invention. 4...Drain pipe, 5...Valve, 6...Drain pipe, 7...
... Ion exchange resin tower, 8 ... Liquid storage tank, 9 ... Weir plate, 10 ... Siphon tube, 11, 13 ... One end, 12 ... Lower end.

Claims (1)

[Scope of utility model registration request] The liquid storage tank is divided into two parts by a weir plate, and a drain pipe is installed downward at the bottom of one side, and a drain pipe connected to the liquid storage tank etc. via a valve is inserted from above into the other side. In addition, one end of the siphon tube installed across the weir plate and having a smaller diameter than the discharge pipe is placed inside the drain pipe, and the other end is positioned higher than the lower end of the discharge pipe, and the siphon pipe is placed on the discharge pipe side. A liquid leakage detection device for a discharge valve, characterized in that a liquid level detection switch is provided at a position higher than the end and lower than the upper end of the weir plate.