JPS6229486Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a hose connecting an inlet/outlet of an electrolytic cell for an aqueous alkali metal salt solution using an ion exchange membrane.

In general, an alkali metal salt aqueous solution electrolyzer using an ion exchange membrane has an anode chamber and a cathode chamber opposed to each other via an ion exchange membrane, and each anode chamber has a salt water supply nozzle and a discharge nozzle, and the cathode chamber has a concentration-adjusted water,
There are supply and discharge nozzles such as a supply nozzle for circulating caustic aqueous solution and a discharge nozzle for taking out product caustic alkali. Generally, as an electrolytic cell having a structure in which a large number of units having the above structure are installed in series, there is a filter press type electrolytic cell using a so-called bipolar cell.

Although the present invention is particularly suitable for the filter press type electrolytic cell, it can of course be used in other types of electrolytic cells as well. That is, electrolysis of an aqueous alkali metal salt solution using an ion exchange membrane method requires a considerably large current, and if this current leaks through the supply/discharge nozzle, it often causes electrolytic corrosion of the nozzle portion. In particular, in the case of a large filter press type electrolytic cell, this tendency becomes even more pronounced because the potential difference between both end electrodes becomes large.

As a means of preventing electrolytic corrosion of the metal supply/discharge nozzle, it may be possible to use a nozzle made of electrically insulating material instead of the supply/discharge nozzle, but due to the fact that the electrolytic cell body is made of metal, etc. It is difficult to firmly attach it to the surface and the workability is poor, making it difficult to use industrially. Therefore, even when using the metal nozzle, the inventors of the present invention have already applied for an electrolytic cell with effective galvanic corrosion prevention means.
No. 78997 is proposed. The gist of this invention is to insert a supply/discharge pipe made of an electrically insulating material into a liquid supply/discharge nozzle. That is, more specifically, in an alkali metal salt aqueous solution unit electrolytic cell in which a diaphragm is arranged between a cathode and an anode to form a cathode chamber and an anode chamber, inside the supply/discharge metal nozzle provided in the cathode chamber and the anode chamber This is an alkali metal salt aqueous solution unit electrolytic cell in which a supply/discharge pipe made of an electrically insulating material is inserted, and a supply/discharge metal nozzle and the supply/discharge pipe are connected via a liquid seal mechanism.

The above structure is effective in preventing corrosion of the liquid supply/drainage nozzle, but the supply/drainage hose (flexible supply/discharge It is relatively difficult to connect with a hose (also called a hose), which requires a lot of effort and can sometimes lead to liquid leakage.

The present invention provides a hose for connecting an electrolytic cell supply/drainage port that obtains the same corrosion-proofing effect as the invention of Utility Model Application No. 51-78997 and also enables easy and reliable connection.

FIG. 1 is a conceptual cross-sectional diagram of one unit of an ion-exchange membrane method alkali metal salt aqueous solution electrolytic cell.

FIG. 2 is an explanatory cross-sectional view of the electrolytic cell supply/discharge nozzle part, and particularly shows one embodiment of the invention of Utility Model Application No. 51-78997. FIG. 3 is a diagram showing an example of the liquid supply/drainage port connection hose of the present invention.

Figures 4 and 5 show a partial cross-section of another embodiment of the invention. FIG. 6 is an example showing a state in which the liquid supply/drainage port connection hose of the present invention is connected to the electrolytic cell liquid supply/drainage nozzle. The basic features of the present invention include a tip having an outer diameter that is approximately the same as the inner diameter of the battery supply/drainage nozzle and a length that is approximately the same as the nozzle, the tip and the hose body, and the contact points between these. This is a hose for connecting the supply and discharge ports of an ion-exchange membrane method alkali metal salt electrolytic cell, which is integrated with a brim-shaped seal body installed nearby.

The present invention will be explained below with reference to the drawings. As shown in Fig. 1, the electrolytic cell frame 1 is connected from a liquid supply header 2 (a salt water supply header in the case of the anode chamber, a header that supplies concentration adjustment water, etc. in the case of the cathode chamber) to a liquid supply hose 3 (usually a header). The solution is supplied through a liquid supply nozzle 4 in the electrolytic cell frame by a flexible hose made of a durable material such as base resin. Further, from the electrolytic cell, the liquid flows through a discharge nozzle 5 and a liquid discharge hose 6 to a liquid discharge header 7 . The present invention can be commonly applied to each liquid supply and/or drainage nozzle and the flexible hose connected thereto, so these can be collectively referred to as the liquid supply and drainage nozzle,
Also referred to as supply/discharge hose, etc.

Figure 2 shows the electrolytic cell frame 1 when the present invention is not used.
2 is a partially enlarged view of the vicinity of the nozzle portion, in which an electrically insulating internal pipe 8 is inserted into the nozzle 4. FIG. Further, connection to the supply/discharge hose 3 or 6 is made by tightening a cap nut 10 via a packing 9, for example. In this case, there are three liquid sealing surfaces: a, b, and c. Therefore,
Liquid leakage is likely to occur depending on the mounting condition of the gasket 10, the state of the flap of the internal pipe or flexible hose, etc. Furthermore, in the case of an industrial device, the total number of parts used is several thousand, and the installation of these parts is quite complicated. Therefore, it is desirable to reduce the number of parts per unit as much as possible. Therefore, in the present invention, a hose having a structure schematically shown in FIG. 3 is proposed. That is, the internal pipe 8 and the supply/discharge hose 3 or 6 are integrated, and there is a brim-shaped seal 11 near the contact point.
These three are integrated. Of course, the contact portion d between the brim-shaped seal body and the outer periphery of the tube body located at its center must be integrated in a liquid-tight manner. The method of connecting the brim-shaped seal body and the pipe body is not particularly limited, and in addition to fitting the brim-shaped seal body into the pipe and fusing it, for example, as shown in Fig. It is also possible to enlarge each tip and adhere the two appropriately. For example, in the case of Teflon pipes, “Teflon
PFA” (registered trademark Nippon Valqua Industries Co., Ltd.), etc. can also be used.

In another embodiment, as shown in FIG. 5, an internal pipe 8, a flexible hose 3 or 6, and a seal body 11 are integrally molded. Of course, other methods may also be used. Regarding the material of the hose used in this invention, fluororesin is recommended for the anode chamber due to its oxidation and chemical resistance, but for the cathode chamber, in addition to fluororesin, polypropylene, polyethylene, chloride resin, etc. Resins such as vinyl can also be used. Those skilled in the art can appropriately select these materials.

In the method of attaching the hose of the present invention, for example, as shown in FIG. 6, the distal end 8 is inserted into the nozzle as an internal pipe. In this case, the smaller the gap between the tip and the nozzle, the better. Then, insert it so that the seal body and the nozzle tip are in sufficient contact with each other, and tighten with a cap nut 8 or the like. In this case, the sealing surface is a
The possibility of liquid leakage is extremely reduced. Furthermore, since the number of mating parts is reduced, work efficiency is significantly improved. In this figure, the tip part 8 and the main body part 3
and 6 are shown with the same thickness, but these diameters may be the same or different.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an ion exchange membrane method alkali metal salt electrolytic cell. FIG. 2 is a diagram showing a conventional method of connecting supply and discharge hoses. FIG. 3 is a diagram showing the general shape of the hose of the present invention. 4 and 5 are specific examples of the present invention. FIG. 6 shows an example of connections when the present invention is applied to a battery case. In the figure, 1 is the electrolytic cell frame, 2 is the liquid supply header, 3 is the liquid supply hose (flexible hose), 4 is the liquid supply nozzle, 5 is the liquid drain nozzle, 6 is the liquid drain hose (flexible hose), and 7 is the drain Liquid header, 8 is an internal pipe (the end of the hose inserted into the nozzle), 9 is a gasket, 10 is a fukuro nut, 11
represent the seal body, respectively.

Claims (1)

[Scope of utility model registration request] An ion having an outer diameter that is approximately the same as the inner diameter of the battery supply/discharge liquid nozzle, and a tip portion that is approximately the same length as the nozzle, and a brim-shaped seal body that is integrated between the tip portion and the main body. Hose for connecting the inlet and outlet of an exchange membrane method alkali metal salt electrolyzer.