JPS5930948B2 - Isolation valve with cleaning solid collector for reverse osmosis equipment - Google Patents

Description

Detailed Description of the Invention In general, when ultrafiltration membranes and reverse osmosis membranes are used for a long period of time, the deposits of slime consisting of suspended solids, microorganisms, organic matter, etc. contained in the feed stock solution and salts precipitated during the concentration operation process occur. As a result, scale is generated on the membrane surface, which reduces the properties of the semipermeable membrane, that is, the permeate volume of the device (water generation capacity) and the rejection rate of solutes in the liquid to be treated (desalination rate). The quality of the permeate is also affected.

In order to prevent contamination of the membrane surface due to this scale component,
Select the amount of liquid fed so that the flow on the membrane surface is turbulent to prevent concentration polarization and slime deposition on the membrane surface, and install an appropriate filter in the liquid feeding system to remove suspended solids. By doing so, contamination of the membrane surface was reduced.

However, in actual processes, it is difficult to completely prevent membrane surface contamination using only the methods described above, and in order to ensure stable operation over a long period of time, it is necessary to regularly remove scale generated on the membrane surface. It is necessary to remove them.

In general, there are two methods for cleaning the membrane surface: physical cleaning methods and chemical cleaning methods. In the case of tubular modules, cleaning with a cleaning solid such as sponge balls is one of the physical cleaning methods. It is known to be the simplest and most effective.

In this case, the flow path of the liquid to be treated in the reverse osmosis device is switched by opening and closing the isolation valve, and the cleaning solids flow through the reverse osmosis device, so the cleaning solids must be collected in one place and replaced. was inconvenient.

The present invention relates to an improvement of an isolation valve for reverse osmosis equipment that overcomes these difficulties, and is removably attached to a valve body and a plurality of bolts at both ends of the valve body, and the an end cap capable of rotating a valve body; a valve body rotatably fitted in the valve body so as to connect and disconnect a valve passage; and a screen attached to either the end cap or the valve body. The object of the present invention is to provide an isolation valve which can easily collect washed solids and which can be replaced.

As described above, in the present invention, end caps are attached to both ends of the valve body by the plurality of bolts so that the valve body can be rotated about one of the plurality of bolts, and the valve body is mounted within the valve body. A valve body is fitted so as to be able to turn freely so that the passage can be interrupted, and a screen is attached to either the end cap or the valve body, so that the movement range of the washed solids is restricted by the screen in the pipe line of the reverse osmosis equipment. It can be restricted as appropriate.

Further, in the present invention, by removing all but one of the plurality of bolts and rotating the valve body around the one bolt, the inside of the end cap and the valve body are exposed to the outside. Cleaning solids collected on a screen disposed on either the end cap or the valve body can be easily and reliably removed and new cleaning solids can be charged. This makes it possible to exchange the washed solids very efficiently.

The present invention will be described below with reference to the embodiment shown in FIGS. 1 to 3. Reference numeral 1 denotes a circulation tank, and the suction port of a high-pressure pump 2 is connected to the bottom of the tank 1.

3 is a reverse osmosis module, and valves 4, 5, and 6°7 are the first
A piping system as shown in the figure is installed, isolation valves 8 and 9 with ball collectors are installed at the inlet and outlet of the liquid to be treated of the reverse osmosis module 3, and a cooler 10 is installed at the circulation inlet side of the circulation tank 1. is interposed.

As shown in FIGS. 2 and 3, the isolation valves 8 and 9 with ball collectors have a valve body 11 and a valve body 11, as shown in FIGS.
A pair of end caps 12 that can be watertightly joined to both ends of 1.
, four tightening bolts 13 that integrally connect the pair of end caps 12 to each other, a seat 14 fitted in the valve body 11, and a seat 1 pivotable about a vertical axis.
4, a handle 16 that is integrally fixed to the valve body 15, a screen 18 that is fitted to the valve passage 17 in the ball valve body 15, and a valve body 11 and an end. It consists of a cap 12 and a packing 19 inserted into the cap 12.

Since the embodiment shown in FIGS. 1 to 3 is constructed as described above, during treatment operation by the reverse osmosis device, the liquid to be treated supplied to the circulation tank 1 is pressurized by the high-pressure pump 2. be done.

In this case, when valves 4 and 7 are opened and valves 5 and 6 are closed, the liquid to be treated is circulated from circulation tank 1 → high pressure pump 2 → valve 4 → valve 8 →
It circulates from reverse osmosis module 3 → valve 9 → valve 7 → cooler 10 → circulation tank 1, and is separated into permeated water and concentrated liquid by the reverse osmosis membrane in reverse osmosis module 3, and the permeated water is taken out of the system. The concentrate is then returned to the circulation tank 1 through the cooler 10.

Also, if valves 4 and 7 are closed and valves 5 and 6 are opened, the liquid to be treated will flow through circulation tank 1 → high pressure pump 2 → valve 5 → valve 9 → reverse osmosis module 3 → valve 8 → valve 6 → cooler 10→circulation to the circulation tank 1, and the flow of the treated liquid in the reverse osmosis module 3 flows backward.

In the pipe line sandwiched by the isolation valves 8 and 9 with ball collectors, the cleaning sponge balls 20 are separated from the liquid to be treated by the screen 18, and are prevented from entering into other pipe lines, thereby preventing reverse osmosis. The surface of the reverse osmosis membrane is cleaned by friction when it passes back and forth within the module 3.

Since the same cleaning sponge ball 20 can be used repeatedly in this way, operation and maintenance are easy.

Furthermore, by periodically switching the flow direction of the reverse osmosis modules 3, the membrane performance of each module 3 can be averaged, and the reverse osmosis membrane cleaning operation can be performed automatically.

Furthermore, if the cleaning sponge ball 20 is damaged,
By removing three of the bolts 13, loosening the remaining one, and rotating the valve body 11 around the bolts 13 as shown in FIG. 2, the valve passage 17 of the valve body 11 can be opened. The sponge balls 20 can be exposed to the outside, and the sponge balls 20 collected by the screen 18 in the valve passage 17 can be taken out, new sponge balls 20 can be inserted, and the sponge balls 20 can be replaced easily.

Furthermore, since the valves 8 and 9 can serve both as a reverse osmosis module isolation valve and a cleaning ball collector, it is possible to reduce costs.

In the embodiment shown in FIGS. 1-3, the screen 18
was installed in the valve passage 17 of the valve body 11, but a screen 1 was installed in the end cap 12 on the side away from the reverse osmosis module 3.
8 may also be provided, and the same effects as in the above embodiment can be achieved.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Figure 1 shows a reverse osmosis device with a cleaning solid collector according to the present invention.
A flow sheet for a reverse osmosis device using an example of an isolation valve,
Fig. 2 is a perspective view illustrating the usage state of the above embodiment;
The figure is a longitudinal side view of the embodiment, and FIG. 4 is a longitudinal side view of another embodiment. 8, 9... Isolation valve with ball collector, 11...
... Valve body, 12 ... End cap, 13.
...Tightening bolt, 14... Seat, 15
... Valve body, 16 ... Bundle, 17.
... Valve passage, 18 ... Screen, 19
...-Patsukin, 20...Cleaning sponge ball.

Claims (1)

[Claims] 1 A valve body, an end cap that is removably attached to both ends of the valve body with a plurality of bolts and that allows the valve body to rotate around one of the bolts, and a valve passage within the valve body. An isolation valve with a cleaning solids collector for a reverse osmosis device, characterized by comprising a valve body fitted so as to be able to rotate freely intermittently, and a screen attached to either the end cap or the valve body. .