JP2008145147A - Electrode for detecting potential difference - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode for detecting potential difference capable of simply removing the air in a porous filter without the use of a pressure reducing device. <P>SOLUTION: The electrode for detecting potential difference is equipped with a cover 1 and a holder 2, both of which are connected integrally, the porous filter 7 provided to the opening part of the cover 1, the electrode element 5 provided to the holder 2 and positioned in the internal liquid 10 of the space between the cover 1 and the holder 2; a screw part 3 composed of the female screw 3a formed to the cover 1 and the male screw 3b formed to the holder 2 and the sealing material 4 provided in the vicinity of the screw part 3. Since the overlap part L of the cover 1, including the screw part 3 and the holder 2, is sealed by the sealing material 4 on the way of the threading of the cover 1 and the holder 2 by the screw part 3, the internal liquid 10 is extruded to the outside of the electrode on; and after through the porous filter 7 by a rise in liquid pressure accompanied by the advance of the threading, and at this time, the internal air of the porous filter 7 is also extruded together to the outside of the electrode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a potential difference detection electrode used in a measuring instrument for measuring electrical characteristics in seawater.

  Potential difference detection in seawater can be achieved by measuring the potential difference between two electrode elements installed in seawater. As a potential difference detection electrode having the electrode element, a shield plate is provided so as to surround the electrode body in the case body around the electrode body (electrode element) for the purpose of not being affected by external noise. There is an electrode in which this shield plate is connected to the ground in the circuit section through the outer conductor of the cable, and incoming external noise is dropped to the ground through the shield plate (see, for example, Patent Document 1).

  In such an electrode, when the tidal current hits the electrode element, the measured value greatly fluctuates. Therefore, the electrode element is housed in a case in which a porous filter for electrical connection between the electrode element and seawater is provided in the opening. Structured electrodes are commonly used.

The electrode has a structure as shown in FIG. The electrode shown in FIG. 5 is formed by connecting the cover 1 and the holder 2 with the screw part 3 and the cover 1 with a sealing material 4 interposed between the cover 1 and the holder 2 so as to be adjacent to the rear end part of the screw part 3. The internal liquid 10 filled in the space with the holder 2 is sealed so as not to leak out. The electrode element 5 is attached to the holder 2, the electrode element 5 is located in the internal liquid 10, and the lead wire 6 from the electrode element 5 is led out of the holder 2. The opening of the cover 1 is provided with a porous filter 7 for preventing tidal current and electrically connecting the electrode element 5 and seawater.
JP 2000-227411 A

  Since the filter 7 used for the electrode as shown in FIG. 5 is porous, air remains in the filter 7 even when the electrode is immersed in seawater. As a result, the air flows between the electrode element 5 and the seawater. It has been found that the electrical resistance is increased, causing the fluctuation of the measured value to increase.

  In the case of the electrode having the structure shown in FIG. 5, when the cover 1 and the holder 2 are completely screwed together, the B portion surrounded by a circle is finally sealed by the sealing material 4. Accordingly, the internal fluid pressure in the space in which the electrode element 5 is accommodated rises due to screwing, but the internal fluid 10 does not pass through the threaded portion 3 having a large gap instead of the porous filter 7 at the tip of the cover 1 due to the pressure. Since it is pushed out, the internal air of the porous filter 7 remains and is not removed.

  For this reason, conventionally, in order to remove the air inside the porous filter at the time of manufacturing, the porous filter is immersed in salt water, and the pressure around the porous filter is lowered using a decompression device to remove the air inside the porous filter. Has been adopted.

  However, this method requires a pressure reducing device to remove the air inside the porous filter, and it is necessary to control the pressure at the time of pressure reduction to such a level that the seawater does not boil.

  The present invention has been made paying attention to such problems, and an object thereof is to provide a potential difference detection electrode that can easily remove air inside a porous filter without using a decompression device. It is said.

  In order to solve the above problems, the potential difference detection electrode of the present invention includes a main body one part and a main body other part that are integrally coupled, a porous filter provided in an opening of the main body one part, and a main body other part. An electrode element located in the internal liquid in the space between the main body one part and the main body other part in a coupled state with the main body one part, and interposed between the main body one part and the other main body part. And a sealing material that seals the internal liquid in the space between the main body and the other portion of the main body, and when the main body one portion and the other main body portion are joined together with a sealing material interposed therebetween, Means for providing the sealing function is provided.

  According to this electrode, when the main body one part and the main body other part are joined, the sealing function of the sealing material is exerted in the middle of joining, and thereafter, the internal fluid pressure increases as the joining progresses. Will be pushed out of the electrode through the porous filter without leaking from the gap between the one part of the main body and the other part of the main body. At this time, the air remaining inside the porous filter is pushed out of the electrode together with the internal liquid, so that the air inside the porous filter can be removed.

  Specifically, in this electrode, the means comprises a screw part for screwing together the main body one part and the other main body part, and the sealing material provided in the vicinity of the screw part. When the other part is completely joined by screwing, it is preferable that the sealing material is positioned in the middle of the overlap part between the one part of the main body and the other part of the main body. In this case, in the middle of assembling the electrode, that is, in the middle of screwing the main body one part and the main body other part with the screw part, the overlap part of the main body one part and the main body other part including the screw part is sealed by the sealing material, Thereafter, the internal fluid pressure in the space between the one part of the main body and the other part of the main body naturally increases with the screwing, and the residual air inside the porous filter is removed as described above.

  According to the first aspect of the present invention, a decompression device for removing air inside the porous filter is not necessary. Moreover, since the air inside the porous filter can be removed simply by assembling in the same manner as a conventional electrode, the work time and labor for removing the air inside the porous filter are not required.

  According to the second aspect of the present invention, the air inside the porous filter can be removed with a simple structure.

  Hereinafter, the present invention will be described in more detail with reference to embodiments.

  FIG. 1 is a longitudinal sectional view of a cover 1 (one body part) of a potential difference detection electrode according to the embodiment, and FIG. 2 is a longitudinal sectional view of a holder 2 (other body part). However, the same elements as those of the conventional electrode shown in FIG. This electrode includes a cover 1 and a holder 2.

  The cover 1 has a cylindrical shape having an opening (not denoted by a reference numeral) for introducing external seawater inside, and the inside is a cavity 8. The cavity 8 includes a portion 8a filled with the internal liquid 10 (FIGS. 3 and 4) and a portion 8b into which the holder 2 is inserted, and the portion 8b has a larger diameter than the portion 8a. A porous filter 7 for preventing tidal current and electrically connecting the electrode element 5 and seawater is provided at the opening at the tip of the cover 1. A female screw 3 a constituting the screw portion 3 is formed on a part of the inner peripheral surface of the hollow portion 8 b located on the rear end side of the cover 1.

  The holder 2 has a columnar shape that is integrally coupled to the cover 1, and includes an electrode element 5 that protrudes from the center of the front end surface thereof. The electrode element 5 is made of, for example, Ag / AgCl, and the lead wire 6 is led out from the rear end surface of the holder 2 to the outside. On the outer peripheral surface on the tip end side of the holder 2, a male screw 3b constituting the screw portion 3 is formed. An annular groove 21 is formed in the vicinity of the male screw 3b, and the annular sealing material 4 is fitted in the groove 21. This sealing material 4 is an overlap portion L (FIG. 4) between the cover 1 and the holder 2 in which the internal liquid 10 in the space between the cover 1 and the holder 2 (a part of the hollow portion 8a and the hollow portion 8b) includes the screw portion 3. Seal to prevent leakage. Further, the rear end side of the groove 2 of the holder 2 has a step 22 corresponding to the thickness of the rear end portion 9 of the cover 1. A portion from the male screw 3 b to the step 22 of the holder 2 becomes an overlap portion L with the cover 1.

  In the electrode configured as described above, in order to remove the air remaining in the porous filter 7, it is only necessary to screw the cover 1 and the holder 2 together. That is, as shown in FIG. 3, when the cover 1 and the holder 2 are screwed together by the screw part 3 (the female screw 3a and the male screw 3b), the A part surrounded by the circle in FIG. 4 is sealed. That is, the sealing material 4 is interposed between the cover 1 and the holder 2 and presses against the inner peripheral surface of the cover 1. Thereby, the overlap portion L between the cover 1 and the holder 2 including the screw portion 3 that can be a gap between the cover 1 and the holder 2 is sealed while being screwed, so that the internal liquid 10 is overlapped. No leakage from part L.

  When the cover 1 and the holder 2 are further screwed together from the state of FIG. 3, the rear end portion 9 of the cover 1 comes into contact with the step 22 of the holder 2. In this state, the screwing (coupling) between the female screw 3a and the male screw 3b is completed. Since the holder 2 enters the hollow portion 8b of the cover 1 in the process of being in this completely coupled state, the hydraulic pressure of the internal liquid 10 in the space between the cover 1 and the holder 2 increases, but the screw portion 3 is already included. Since the overlap portion L is completely sealed with the sealing material 4 (A portion in FIG. 3), the internal liquid 10 is pushed out of the electrode through the porous filter 7 by the hydraulic pressure. At this time, the air remaining inside the porous filter 7 is also pushed out of the electrode together with the internal liquid 10, whereby the internal air of the porous filter 7 is removed.

  However, since the purpose is to push the air inside the porous filter 7 to the outside of the electrode, the screwing operation of the cover 1 and the holder 2 can be performed with the porous filter 7 at the tip of the cover 1 facing upward. It is essential.

  Of course, in a state where the cover 1 and the holder 2 are screwed together, the sealing material 4 is located in the middle of the overlap portion L between the cover 1 and the holder 2 as shown in FIG.

  According to this electrode, not only a decompression device for removing the air remaining inside the porous filter 7 becomes unnecessary, but also the internal air of the porous filter 7 is removed simply by assembling in the same manner as the conventional electrode. Therefore, the work time and labor for removing the internal air of the porous filter 7 become unnecessary. That is, the internal air of the porous filter 7 can be removed simultaneously with the assembly. Further, the groove 21 is formed in the vicinity of the male screw 3 b of the holder 2, and the internal air of the porous filter 7 can be removed with a simple structure in which the sealing material 4 is fitted into the groove 21.

  In the above embodiment, the sealing material 4 is provided close to the male screw 3b of the holder 2, but if possible, a groove is provided close to the female screw 3a of the cover 1, and the sealing material 4 is provided in this groove. May be fitted.

  Moreover, in the said embodiment, although the cover 1 and the holder 2 are couple | bonded by the screw part 3, the structure which couple | bonds the cover 1 and the holder 2 only with the sealing material 4 may be sufficient. In this case, the same effect can be obtained by adopting a structure in which the portion A (or the vicinity thereof) can be sealed before the cover 1 and the holder 2 are completely joined as shown in FIG.

It is a longitudinal cross-sectional view of the cover of the potential difference detection electrode according to the embodiment. It is a longitudinal cross-sectional view of the holder of the potential difference detection electrode according to the embodiment. In the potential difference detection electrode according to the embodiment, it is a longitudinal sectional view showing a state in the middle of screwing the cover and the holder. It is a longitudinal cross-sectional view which shows the state which the screwing of the cover and the holder was completed in the same potential difference detection electrode. It is a longitudinal cross-sectional view of a potential difference detection electrode according to a conventional example.

Explanation of symbols

1 Cover (Body one part)
2 Holder (the other part of the main body)
DESCRIPTION OF SYMBOLS 3 Screw part 3a Female screw 3b Male screw 4 Seal material 5 Electrode element 7 Porous filter 8 Cavity 10 Internal liquid L The overlap part of a cover and a holder

Claims (2)

One part of the main body and the other part of the main body coupled together,
A porous filter provided in the opening of one part of the main body;
An electrode element that is provided in the other part of the main body and is located in the internal liquid in the space between the main body one part and the main body other part in a combined state with the main body one part;
In an electrode that is interposed between the main body one part and the main body other part, and includes a sealing material that seals the internal liquid in the space between the main body one part and the main body other part,
An electrode for potential difference detection, comprising means for exerting a sealing function of a sealing material in the middle of coupling when the main body one portion and the other main body portion are coupled with a sealing material interposed therebetween.   The means comprises a screw portion for screwing the main body one portion and the main body other portion together, and the sealing material provided in the vicinity of the screw portion, and the main body one portion and the other main body portion are completely screwed together. 2. The potential difference detection electrode according to claim 1, wherein, when bonded, the sealing material is positioned in the middle of the overlap portion between the one part of the main body and the other part of the main body.