JPS59108950A - Glass electrode - Google Patents

Abstract

PURPOSE:To obtain an electrode easy to made and free from deterioration in the insulation even due to use at a high temperature or the like by sealing an internal liquid with a silicon rubber outside a sealing piece while internal and external lens are connected electrically in a contactless manner mechanically with an internal conductive silicon rubber. CONSTITUTION:A glass film 2 is mounted at the tip of a support tube 1. On the other hand, a dichroic-molded seal piece 5 comprising a conductive silicon bubber 51 and a non-conductive silicon rubber 52 is molded while a lead 61 is connected to silver chloride 4. Additionally, a lead 62 is stuck into the rubber 51 from the opposite side thereof while a lead 61 is stuck into the seal piece 5 from the side of the rubber 52 to the rubber 51. Therefore, an internal liquid 3 is injected into a support tube 1, the seal piece 5 with the leads 61 and 62 forced into the support tube 1 to the specified position and then, the internal liquid 3 sealed up. Then, a silicon 7 is injected into an upper clearance of the seal piece 5 in the support tube 1 for adhesion. Finally, the support tube is adhesively inserted into an outer tube 8 made of an anticorrosive PBS resin to complete a glass electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvement of glass electrodes, and an object of the present invention is to provide an electrode that is easy and inexpensive to manufacture and does not cause insulation deterioration even when used at high temperatures.

FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a support tube for a glass electrode, and a glass membrane 2 is provided at the bottom thereof. 3 is an internal solution, and 4 is a silver chloride electrode immersed in the internal solution 3.

5 is a sealing piece. This sealing piece 5 is composed of a two-color mold consisting of a conductive silicone rubber 51 having a T-shaped cross section and a non-conductive silicone rubber 52 surrounding the enlarged portion. The outer periphery of the rubber 52 is corrugated so that the outer diameter is slightly larger than the inner diameter to ensure tight contact with the support tube 1. 61 is an inner lead wire whose tip is coated with silver chloride 4, and 62 is an outer lead wire. The lead wires 61 and 62 are mechanically non-contact and are electrically connected via the conductive rubber 51. 7 is a silicone adhesive injected into the upper support @1 of the sealing piece 5;

A glass electrode having such a configuration is manufactured as follows. A glass membrane 2 is attached to the tip of the support tube 1. on the other hand,
A two-color molded sealing piece 5 made of a conductive silicone rubber 51 and a non-conductive silicone rubber 52 is molded, and silver chloride 4 is coated on the surface of a silver lead wire 61. Then, the lead wire 61 is inserted from the rubber 52 side of the sealing piece 5 until it reaches the rubber 51. Further, a lead wire 62 is inserted into the rubber 51 from the opposite side. Thereafter, the internal liquid 3 is injected into the support tube 1, and the sealing piece 5 to which the lead wires 61 and 62 are attached as described above is press-fitted to a predetermined position within the support tube 1 to seal the internal liquid 3. Then, silicone adhesive 7 is applied to the gap above the sealing piece 5 in the support tube 1.
are injected and bonded so that the lead wires 62 are exposed. Finally, the glass electrode is completed by inserting and adhering it into an outer tube 8 made of corrosion-resistant bonyphenylene sulfide resin as shown in FIG. In addition, 9 in Figure 2 □ is an O-ring, 10
is a terminal, and 12 is an adhesive.

Conventional electrodes of this type are shown in FIGS. 3(a) and 3(b). (
b) The device shown in the figure has a structure in which a silicone gasket 11 for sealing internal liquid with a through hole provided in the support 1 is press-fitted, and the silicone gasket 11 is bonded thereon with a silicone adhesive 7. In addition, the electrode shown in FIG. 2B has a lead platinum wire 63 sealed in glass to the upper part of the support tube 1 to seal the internal liquid 3. Then connect the inside of the platinum wire 63 to the lead wire 6.
4 is connected to the silver chloride 4, and a lead wire 65 for derivation is connected to the outside.

However, according to the electrode shown in (a), the lead wire 6 connected to the silver chloride 4 passes through the sealing gasket 11 and the adhesive 7 in the middle and is extended to the terminal 10. Therefore, the internal liquid 3 oozes out through the penetrating portion. In particular, the adhesive interface between the lead wire 6 and the adhesive 7 peels off at high temperatures due to the difference in coefficient of expansion between the two, making the above phenomenon even more significant. As a result, insulation deterioration occurs in glass electrodes that require high insulation, and contact failures and disconnection failures occur due to corrosion of lead wires and terminals.

In addition, in the device shown in (B), the internal liquid 3 is sealed by sealing the platinum wire 63 with glass, but the platinum wire
Unavoidable processing distortion occurs when sealing.

For this reason, the yield of good products is low, glass processing requires skill, and the cost of the product is high. Furthermore, there is also the problem that the glass portion is damaged due to the above-mentioned distortion due to the temperature cycle, and the internal liquid 3 leaks as shown in Figure (A).

In contrast, in the present invention, a sealing piece is constructed in which conductive silicone rubber is surrounded by non-conductive silicone rubber. The outer silicone rubber seals the internal liquid, and the inner conductive silicone rubber connects the internal and external lead wires mechanically and electrically without contact. As a result, it is possible to provide an electrode that can withstand continuous use at high temperatures without deterioration of insulation or corrosion of the lead system due to leakage of internal liquid. In addition, not only is the skilled processing technology required for glass sealing unnecessary, but also an inexpensive electrode that can be assembled and manufactured by anyone can be realized.

In addition, in the embodiment, the rubber 51 of the sealing piece 5 is T-shaped, but it may be cylindrical or the like, and the rubber 52 of the sealing piece 5 may have a cylindrical shape.
It may be possible to surround the entire area with

Therefore, according to the present invention, an extremely practical glass electrode can be provided.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are configuration explanatory diagrams of the device according to the present invention;
FIGS. 3A and 3B are explanatory diagrams of the configuration of conventional electrodes. DESCRIPTION OF SYMBOLS 1... Support tube, 3... Internal liquid, 5... Sealing piece, 5
1... Conductive rubber, 52... Non-conductive rubber, 61.
62...Lead line, 31st U) Procedural amendment writing method) % formula % 1. Indication of case Patent application 1987-21874 April 2
, Title of the invention Glass electrode 3, Relationship to the amended person's case Applicant address 2-9-32 Nakamachi, Musashino-shi, Tokyo Name (670) Yokogawa Electric Manufacturing Co., Ltd. 4, Agent name (input) ) (0422) (54) 1111 Name (6692) Patent Attorney Shinsuke Ozawa 6, Full text of the memorandum subject to amendment 7, contents of the amendment as shown in the attached sheet. Description 1, Title of the invention Glass electrode Patent Claims An apparatus having a structure in which a lead wire of a silver chloride electrode immersed in an internal liquid of a glass electrode support tube is led out from the upper part, wherein conductive and non-conductive wires are connected in the support tube. A sealing piece made of silicone rubber is arranged, and the non-conductive silicone rubber of this sealing piece seals the internal liquid, and the lead wire connected to the silver chloride electrode and the lead wire outside the support tube are Glass electrodes that are electrically connected via conductive silicone rubber without mechanical contact. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in glass electrodes, and it is an object of the present invention to provide an electrode that is easy and inexpensive to manufacture and does not cause insulation deterioration even when used at high temperatures. FIG. 1 is an explanatory diagram of the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a support tube for a glass electrode, and a glass membrane 2 is provided at the bottom thereof. 3 is an internal solution, and 4 is a silver chloride electrode immersed in the internal solution 3. 5 is a sealing piece. This sealing piece 5 is composed of a two-color mold consisting of a conductive silicone rubber 51 having a T-shaped cross section and a non-conductive silicone rubber 52 surrounding the enlarged portion. The outer periphery of the rubber 52 is corrugated so that the outer diameter is slightly larger than the inner diameter to ensure tight contact with the support tube 1. 61 is an internal lead wire connected to the silver chloride 4, and 62 is an external lead wire. Lead wire 61
and 62 are mechanically non-contact and are electrically connected via the conductive rubber 51. 7 is a silicone adhesive injected into the support tube 1 above the sealing piece 5.
- A glass electrode having such a configuration is made as follows. A glass membrane 2 is attached to the tip of the support tube 1. On the other hand, a two-color molded sealing piece 5 made of conductive silicone rubber 51 and non-conductive silicone rubber 52 is molded, and a lead wire 61 made of, for example, silver is connected to silver chloride 4 . Then, the lead wire 61 is inserted into the sealing piece 5 from the rubber 52 side until it reaches the rubber 51. Further, a lead wire 62 is inserted into the rubber 51 from the opposite side. After that, the internal liquid 3 is injected into the support tube 1, the lead wires 61 and 62 are attached as described above (the sealed sealing piece 5 is press-fitted to a predetermined position in the support tube 1, and the internal liquid 3 is injected into the support tube 1). Seal.And
Silicone 7 is injected and bonded into the gap above the sealing piece 5 in the support tube 1 so that the lead wire 62 is exposed. Finally, the outer tube 8 made of corrosion-resistant PBS resin as shown in FIG.
The glass electrode is completed by inserting and gluing it inside. In addition, 9 in FIG. 2 is a terminal, and 10 is an O-ring. Conventional electrodes of this type are shown in FIGS. 3(a) and 3(b). (
b) The device shown in the figure has a structure in which a silicone gasket 11 for internal liquid sealing with a through hole provided in the support tube 1 is press-fitted, and the gasket 11 is bonded thereon with a silicone adhesive 7. In addition, the electrode shown in FIG. 2B has a lead platinum wire 63 sealed in glass to the upper part of the support tube 1 to seal the internal liquid 3. Then connect the inside of the platinum wire 63 to the lead wire 6.
4 is connected to the silver chloride 4, and a lead wire 65 for derivation is connected to the outside. However, according to the electrode shown in (a), the lead wire 6 connected to the silver chloride 4 passes through the sealing gasket 11 and the adhesive 7 in the middle and is extended to the terminal 10. Therefore, the internal liquid 3 oozes out through the penetrating portion. In particular, the adhesive interface between the lead wire 6 and the adhesive 7 peels off at high temperatures due to the difference in coefficient of expansion between the two, making the above phenomenon even more significant. As a result, insulation deterioration occurs in glass electrodes that require high insulation, and contact failures and disconnection failures occur due to corrosion of lead wires and terminals. In addition, in the apparatus shown in FIG. 2 (b), the internal liquid 3 is sealed by making the platinum wire 63 into a glass envelope, but when the platinum wire 3 is sealed, unavoidable processing distortion occurs. Therefore, the yield of good products is low, glass processing requires skill, and the cost of the product is high. Furthermore, there is also the problem that the glass portion is damaged due to the above-mentioned distortion due to the temperature cycle, and the internal liquid 3 leaks as shown in Fig. (a). In contrast, in the present invention, a sealing piece is constructed in which conductive silicone rubber is surrounded by non-conductive silicone rubber. The outer silicone rubber seals the internal liquid, and the inner conductive silicone rubber connects the internal and external lead wires mechanically and electrically without contact. As a result, it is possible to provide an electrode that can withstand continuous use at high temperatures without deterioration of insulation or corrosion of the lead system due to leakage of internal liquid. Moreover, not only is the skilled processing technology required in glass processing unnecessary, but also an inexpensive electrode that can be assembled and produced by anyone can be realized. In addition, in the embodiment, the rubber 51 of the sealing piece 5 is exemplified as having a 1-shaped shape, but it may also be cylindrical or the like.
2 may be used to surround the entire area. Therefore, according to the present invention, an extremely practical glass electrode can be provided. Brief Description of the Drawings FIGS. 1 and 2 are diagrams illustrating the configuration of an apparatus according to an embodiment of the present invention;
FIGS. 2(A) and 2(B) are explanatory views of the structure of conventional electrodes.

Claims (1)

[Claims] In an apparatus configured such that a lead wire of a silver chloride electrode immersed in an internal liquid of a glass electrode support tube is led out from the upper part, a sealing piece made of conductive and nonconductive silicone rubber is placed in the support tube and the sealing piece is sealed. The internal liquid is sealed with the piece of non-conductive silicone rubber, and the lead wire connected to the silver chloride electrode and the lead wire outside the support tube are mechanically non-contacted through the conductive silicone rubber. glass electrodes that are electrically connected.