JPS5820927Y2 - Reference electrode internal liquid replenishment mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mechanism for replenishing an internal liquid to a reference electrode (including a reference electrode portion of a composite electrode) used for measuring pH and the like.

Normally, when measuring ion concentrations such as pH, the internal solution of the reference electrode is Internal liquid is replenished by forcibly leaking from the liquid replenishment tank using a constant head or air pressure.

A typical example of a conventional mechanism used for replenishing this internal liquid is shown in Fig. 1. According to this figure, an internal structure having an atmosphere opening port 1 at the top and a supply port 2 at the bottom is shown. The liquid replenishment tank 3 is placed above the reference electrode 4, and the internal liquid replenishment port 5 provided on the reference electrode 4 and the supply port 2 of the replenishment tank 3 are communicated with each other through a replenishment tube 6, and replenishment is performed using a constant head. tank 3
The internal liquid is replenished into the reference electrode 4.

However, in this replenishment mechanism, the connection between the replenishment tube 6 and the replenishment port 5 of the reference electrode 4 is very easy to come off if the end of the tube 6 is simply placed over the replenishment port 5. When the tube band 7 is used for this purpose, there is a disadvantage that the band 7 corrodes due to the internal liquid (usually a concentrated solution of potassium chloride), and when the reference electrode 4 is replaced, the tube 6 must be removed and installed. It's very troublesome.

Particularly when potassium chloride is used as the internal liquid, the connection between the tube 6 and the supply port 5 must be completely sealed because this potassium chloride has extremely strong permeability. If you try to make it perfect, on the contrary, it will be difficult to attach and detach the tube 6.

Furthermore, if air bubbles enter the tube 6, they will be fed into the reference electrode together with the internal liquid, and as a result, large air pockets will be formed within the reference electrode as they repeatedly overlap, resulting in an insufficient amount of internal liquid. There are some drawbacks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a reference electrode internal liquid replenishment mechanism that eliminates the above-mentioned drawbacks of conventional replenishment mechanisms.

An embodiment of the present invention will be described below with reference to FIG. 2 and subsequent figures.

In FIG. 2, 13 is an internal liquid replenishment tank having an atmosphere opening 11 at the top and a supply port 12 at the bottom, 14 is a reference electrode having an upward internal liquid replenishment port 15 at the side, and 16 is a replenishment tube. It shows.

The upper end of the supply tube 16 is connected to the supply port 12 of the tank 13, and the lower end is connected to the supply port 15 of the comparison electrode 14 via a bubble remover 18 and a hollow needle 19.

As shown enlarged in FIG. 3, a bubble remover 18 is attached to the lower end of the supply tube 16, and a hollow needle 19 is connected to the lower part of the bubble remover 18.

The hollow needle 19 pierces the rubber stopper 20 fitted into the replenishment port 15 of the comparison electrode 14 and reaches the inside of the replenishment port 15 .

Therefore, the internal liquid fed to the tube 16 falls from its lower end into the bubble remover 18 with a certain head, and only the internal liquid from which air bubbles have been removed passes through the hollow needle 19 and enters the supply port 18.
5 to the reference electrode 14.

Since the hollow needle 19 directly pierces the rubber stopper 20, and the length of the rubber stopper 20 is approximately as long as its diameter, the seal between the hollow needle 19 and the rubber stopper 20 is perfect. Become something.

When replacing the reference electrode 14, the hollow needle 19 should be replaced with a rubber stopper 20.
It can be easily removed by pulling it out.

As shown in FIG. 4, it is also possible to use a hollow needle 29 that has a stopper 29a formed thereon to prevent it from being pulled out after piercing the rubber stopper. In this case, when removing it, just pull out the rubber stopper from the supply port.

In the embodiments shown in FIGS. 2 and 3, the replenishment port 15 provided in the reference electrode opens upward, but the present invention also covers an embodiment in which the replenishment port 15 opens sideways. At the same time, a rubber stopper 20 is attached to the supply port 15 having a horizontal opening from the lateral direction, and a hollow needle 1 is attached to the rubber stopper 20.
9 or 29 is pierced.

It is preferable that the hollow needle 19 or 29 is made of an aluminum alloy or the like having sufficient corrosion resistance against a rich internal liquid (for example, potassium chloride).

Further, as the rubber stopper 20, silicone rubber, neoprene, or the like is used.

As explained above, the present invention provides a replenishment mechanism configured to replenish internal liquid from an internal liquid replenishment tank to a reference electrode via a replenishment tube, in which a bubble remover is provided in the replenishment tube, and a bubble remover is provided in the replenishment tube. A hollow needle is connected and the hollow needle is pierced through a rubber stopper that closes the internal liquid supply port formed integrally with the reference electrode, so there is no space between the hollow needle and the rubber stopper and between the opening and the rubber stopper. The seal between the holes can be completely ensured by the elasticity of the rubber, and the hollow needle can be easily removed when replacing the reference electrode. Because the reference electrode is small or blocked, the internal liquid does not flow out even if the reference electrode is turned upside down.On the other hand, since the hollow needle has a large flow path resistance, The amount of liquid is extremely small, making it extremely easy to handle when replacing the needle, and even when the needle is inserted into the rubber stopper again, the hole originally made by the needle becomes extremely small due to the elasticity of the rubber. Even if it is inserted into the hole again, the sealing performance will not be affected in any way.

Furthermore, since the internal liquid replenishment tube is equipped with an air bubble remover, it is possible to reliably replenish only the internal liquid to the reference electrode at all times. In addition to ensuring the safety of the seal between the sides and replenishing the internal fluid,
This allows for improved operability.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional replenishment mechanism, Fig. 2 is a sectional view showing an embodiment of the present invention, Fig. 3 is an enlarged sectional view of the main part of Fig. 2, and Fig. 4 is a modification of the hollow needle. It is a sectional view showing an example. 13... Supply tank, 14... Reference electrode, 15... Supply port, 16... Supply tube, 18... Air bubble remover , 19°29...
...Hollow needle, 20...Rubber stopper.

Claims (1)

[Scope of utility model registration request] In a replenishment mechanism configured to replenish internal liquid from an internal liquid replenishment tank to a reference electrode via a replenishment tube,
A bubble remover is provided in the replenishment tube, and a hollow needle is connected to the replenishment tube, and the hollow needle is pierced through a rubber stopper that closes the internal liquid replenishment port formed integrally with the reference electrode, thereby removing the internal liquid from the tube. A reference electrode internal liquid replenishment mechanism, characterized in that the reference electrode internal liquid is supplied through the hollow needle into the reference electrode.