JPH089639Y2 - Ion measuring electrode holder cap - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a holder cap for an electrode for immediate ion detection, which is used for pH measurement, and more specifically, a composite electrode is provided under a cylindrical holder. The present invention relates to a technique for improving a holder cap of an electrode for ion measurement, in which a cable for extracting a signal connected to a composite electrode is led out from the inside of the holder to an upper part.

[Conventional technology]

FIG. 5 shows a conventional holder cap provided on the upper portion of the holder for the ion measuring electrode.

This holder cap 21 has a conical portion 2 on the upper side of a cylindrical portion 21a which is tightly fitted and held on the outer periphery of the upper portion of the holder 22.
1b are provided in a row, a cable lead-out hole 24 for densely leading out a cable 23 is provided at the top of the conical portion 21b, and a holder 22 is provided as the tubular portion 21a is rotated.
A hole 26 that matches the hole 25 formed is formed in the peripheral portion of the tubular portion 21a, and is entirely made of a flexible material such as rubber.

Now, in the electrode for ion measurement described at the beginning (see FIG. 1 of the embodiment of the present invention for the specific structure), it is prevented that the liquid junction of the reference electrode of the composite electrode is clogged. Holder 22 to hold the composite electrode in order to
Accommodating the internal solution in the inner space P ₂ of, and the inner space P ₂
Is opened to the atmosphere, and the internal liquid leaks out from the liquid junction based on the head pressure to a very small extent. 25 and 26 are provided on the holder 22 and the tubular portion 21a.

[Problems to be solved by the device]

By the way, the above-mentioned ion measuring electrode is often used outdoors, and therefore, in order to prevent rainwater from entering through the cable lead-out hole 24, the cable 23 is closely led to the cable lead-out hole 24. However, it is extremely difficult to insert the cable 23 into the cable lead-out hole 24, and the ion measuring electrode and the measuring instrument are connected to both ends of the cable 23, and the holder cap 21 is so-called. Since it is in the state of being fitted and killed, it is very difficult and time-consuming to replace the holder cap 21.

In addition, if the holder cap 21 is removed from the holder 22, it is possible to easily replenish the internal space P ₂ of the holder 22 with the internal liquid, but this makes it impossible to pull out the connection part between the cable 23 and the composite electrode. Since force is applied and the cable lead-out hole 24 is damaged, as described above, the holder 22 and the tubular portion 21a are provided with holes 25 and 26 for replenishing the internal liquid, which also serve to open the atmosphere. , There was a great risk of rainwater entering for this.

An object of the present invention is to provide a holder cap that can solve all the above inconveniences.

[Means for solving the problem]

The holder cap for an electrode for ion measurement according to the present invention, which has achieved the above-mentioned object, is provided with a composite electrode at the bottom of a cylindrical holder having an internal space for containing an internal liquid when placed under the atmosphere. , A holder cap for an ion measuring electrode in which the internal liquid is replenished to the internal space of the holder from the upper end opening of the holder, and a signal extraction cable connected to the composite electrode is led out from the inside of the holder to the upper end opening. And a cross-section in which a lid portion is continuously provided on the upper side of a tubular portion that is tightly fitted and held on the outer periphery of the upper end of the holder, and at least a part of the inner peripheral surface portion of the tubular portion projects outward. A U-shaped or rectangular groove-shaped concave portion for leading out the cable is formed, and the whole is made of a flexible material such as rubber. Furthermore, a case led out to the upper end opening of the holder is formed. Bend the cable below the holder and cover the bent cable with the cable lead-out recess.The cable lead-out recess and the cable and the holder make the internal space of the holder communicate with the outside. The feature is that a small gap is formed to open the internal space to the atmosphere.

[Action]

According to the above-mentioned characteristic configuration, the cable is positioned at least in the cable guiding recess formed in the inner peripheral surface of the tubular portion, and the tubular portion is tightly fitted and held on the upper outer periphery of the holder. Thus, the holder cap is attached to the upper part of the holder.

Then, by grasping the cable together with the holder and pulling out the holder cap, the holder cap can be removed from the holder without exerting an excessive force on the cable.

Further, the cylindrical holder has an internal space for accommodating the internal liquid from the upper end opening in a state of being opened to the atmosphere, and projects outward to at least a part of the inner peripheral surface part of the cylindrical portion of the holder cap. Since the concave portion for leading out the cable having the U-shaped cross section or the rectangular groove shape is formed, the inner space of the holder is communicated with the outside between the concave portion for leading out the cable, the cable and the holder. A small gap can be formed, and the internal space can be opened to the atmosphere through this small gap. In other words, in addition to the holder holding the composite electrode, it also serves as replenishment of the internal liquid and opening to the atmosphere,
It is possible to prevent the liquid junction of the reference electrode of the composite electrode from being clogged. Moreover, as described above, since the opening of the small gap faces downward, even when the ion measuring electrode is used outdoors, there is no possibility that rainwater will enter the internal space of the holder.

〔Example〕

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

FIG. 1 shows an ion measuring electrode, and FIG. 2 and FIG.
The figure shows the details of the main part.

In the figure, reference numeral 1 denotes a composite electrode, which is formed by providing a measurement electrode 2 and a comparison electrode 3 on an electrode body 4, and is mounted in a liquid-tight state under a cylindrical holder 5 via a packing a. J
Is a liquid junction of the comparison electrode 3.

A flow path b is formed in the electrode body 4 to connect the internal space P of the holder 5 to the liquid junction J, and the internal space P is also used as a storage tank for the internal liquid. ing. That is, the cylindrical holder 5 is
It has an internal space P for accommodating the internal liquid from the upper end opening in a state of being placed under the atmosphere.

Reference numeral 6 denotes a signal extraction cable connected to the composite electrode 1 and is led out from the upper end opening of the holder 5 through the internal space P of the holder 5.

Reference numeral 7 denotes a holder cap mounted on the upper end of the holder 5, which is molded from a flexible elastomer such as rubber, and specifically, is tightly fitted and held on the outer periphery of the upper portion of the holder 5 by elastic deformation. And a lid portion 7b continuously provided on the upper side of the tubular portion 7a,
In addition, a concave portion c for leading out the cable is bulged and formed in a part of the lid portion 7b and an inner peripheral surface portion of the tubular portion 7a.

The concave portion c has a U-shaped cross section having a semicircular bottom portion having a radius slightly larger than the radius of the cable 6, and its depth is set to about the same as the diameter of the cable 6. However, the radius of the bottom of the semicircle is the same as or slightly smaller than the radius of the cable 6, the depth of the recess is made slightly larger than the diameter of the cable 6, or the shape of the recess c is a square groove. The shape and size of the concave portion c may be set arbitrarily.

According to the above configuration, as shown in FIG. 4, the cable 6 led out to the upper part of the holder 5 is bent downwardly of the holder 5, and the bent cable 6 is covered with the cable guiding recess c. By tightly fitting and holding the cylindrical portion 7a of the holder cap 7 on the outer periphery of the upper end of the holder 5, the holder cap 7 can be attached to the upper end of the holder 5 very easily.

In this state, two small gaps P _{1 for} communicating the internal space P of the holder 5 to the outside are formed between the recess c, the cable 6 and the holder 5, and the internal space P is opened to the atmosphere. It is like this. Since the opening of the gap P ₁ faces downward, there is no possibility that rainwater will enter the internal space P even when the ion measuring electrode is used outdoors.

On the other hand, the cable 6 bent downward is held in the holder 5
By pulling out the holder cap 7 while holding it together with the holder cap 7, the holder cap 7 can be removed from the holder 5 without applying an excessive pulling force to the connecting portion of the cable 6 to the composite electrode 1. Thus, maintenance such as replenishment of the internal liquid to the internal space P and replacement of the holder cap 7 can be performed very easily.

Further, it is sufficient for the two small gaps P ₁ to have a size that allows the cable 6 to be released into the atmosphere to a minimum extent such that the cable 6 can be exactly pressed by the recess for guiding the cable and the holder 5. even slant holder 5, together with the internal fluid from the two small gaps P ₁ is eliminated a possibility that leak has the advantage that the cable 6 can be securely fixed together during the formation of the two small gaps P _1.

In the embodiment, the concave portion c for leading out the cable is also formed on the inner peripheral surface portion of the lid portion 7b, but it may be formed only on the inner peripheral surface portion of the tubular portion 7a.

[Advantage of the Invention] As described above, according to the holder cap for the electrode for ion measurement according to the present invention, the cylindrical portion is closely covered with the outer periphery of the upper portion of the holder so that the cable is positioned in the recess for guiding the cable. By fitting and holding the holder cap, the holder cap is mounted on the upper part of the holder. Therefore, compared to the conventional structure in which the holder cap is penetrated and the cable is led out, the holder cap can be easily mounted on the upper part of the holder. Can be done easily.

Moreover, since the opening for opening to the atmosphere (a small gap described later) formed by the holder and the concave portion faces downward, there is no possibility that rainwater will enter the internal space of the holder that stores the internal liquid.

On the other hand, it is easy to remove the holder cap from the holder without applying excessive force to the cable.
Replenishment of the internal liquid to the internal space of the holder can be performed very easily from the upper part of the holder.

The fact that the internal liquid can be replenished to the internal space from the upper end opening of the holder means that it is not necessary to form a hole for replenishing the internal liquid in the holder. Since it is not necessary to provide holes for replenishing the internal liquid and holes for leading out the cable in the holder cap, the shape of the holder cap itself becomes simple, and the holder cap itself Cost reduction can be achieved.

Further, the cylindrical holder has an internal space for accommodating the internal liquid from the upper end opening in a state of being opened to the atmosphere, and projects outward to at least a part of the inner peripheral surface part of the cylindrical portion of the holder cap. Since the concave portion for leading out the cable having the U-shaped cross section or the rectangular groove shape is formed, the inner space of the holder is communicated with the outside between the concave portion for leading out the cable, the cable and the holder. A small gap can be formed, and the internal space can be opened to the atmosphere through this small gap. In other words, in addition to the holder holding the composite electrode, it also serves as replenishment of the internal liquid and opening to the atmosphere,
It is possible to prevent the liquid junction of the reference electrode of the composite electrode from being clogged. Moreover, as described above, since the opening of the small gap faces downward, even when the ion measuring electrode is used outdoors, there is no possibility that rainwater will enter the internal space of the holder.

Moreover, this small gap is sufficient to have the minimum necessary size that allows the cable to be released to the atmosphere to the extent that the cable can be exactly pressed by the recess for guiding the cable and the holder, so even if the holder is tilted,
There is an advantage that the internal liquid does not leak from the small gap and the cable can be surely fixed at the time of forming the small gap.

[Brief description of drawings]

FIG. 1 is a schematic vertical side view of an ion measuring electrode, FIG. 2 is a perspective view of an upper part of the ion measuring electrode, FIG. 3 is a sectional view of a holder cap mounting portion, and FIG. 4 is a holder cap mounting explanatory view. FIG. 5 is a perspective view of a conventional holder cap with a part broken away. 1 ... Composite electrode, 5 ... Holder, 6 ... Cable, 7a
…… Cylindrical part, 7b …… Lid part, c …… Cable lead-out recess, P ₁ …… Small gap.

Claims (1)

[Scope of utility model registration request] 1. A composite electrode is provided in the lower part of a cylindrical holder having an internal space for containing an internal liquid in a state of being opened to the atmosphere, and the internal liquid is replenished to the internal space of the holder by opening the upper end of the holder. And a holder cap for an ion measuring electrode in which a signal extraction cable connected to the composite electrode is led out from the inside of the holder to the upper end opening, and is tightly fitted and held on the outer periphery of the upper end of the holder. A lid portion is continuously provided on the upper side of the tubular portion, and at least a part of the inner peripheral surface portion of the tubular portion is provided with a concave portion for leading out a cable having a U-shaped cross section or a square groove shape that projects outward. In addition, the whole is made of a flexible material such as rubber, and the cable led out to the upper end opening of the holder is bent below the holder, and the bent cable is connected to the cable. The recess for guiding the cable is covered, and the recess for guiding the cable, the cable, and the holder form a small gap for communicating the internal space of the holder to the outside and opening the internal space to the atmosphere. A holder cap for an electrode for ion measurement characterized by.