JP2008203074A - Electrode protector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode protector capable of preventing surely drying of a sensitive part of an electrode by a necessary minimum quantity of preserving liquid. <P>SOLUTION: The electrode protector 1, which is an electrode protector 1 for protecting the electrode 2 having an electrode 2a and an electrode cap 2b for supporting it, includes a bottomed cylinder 10 into which the electrode 2a is to be inserted; and a sealing material (O ring 20) mounted on the inner circumferential surface of the bottomed cylinder 10, and stickable to the electrode 2a to be inserted into the bottomed cylinder 10, and is constituted so that, when the electrode 2a is inserted into the bottomed cylinder 10, the opening end side of the bottomed cylinder 10 abuts on the electrode cap 2b. In the bottomed cylinder 10, a sealing material mounting member 12 on which the sealing material is to be mounted is incorporated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrode protector for protecting an electrode of a rod-shaped electrode body such as an electrode body for pH measurement.

In general, an electrode body used for pH measurement or the like includes a rod-shaped electrode having a sensitive portion at the tip, and an electrode cap attached to the base end of the electrode and supporting the electrode.
The sensitive part of the electrode usually needs to be kept wet. Therefore, when not in use, it is common to cover a protective body made of an elastic resin filled with a preservative solution. Further, as an electrode protector when not in use, Patent Document 1 discloses an electrode protector that is screwed onto a body body that is an electrode cap to which an electrode is attached.
No. 05-36210

However, since the protective body made of an elastic resin has moisture permeability to some extent, it has been difficult to sufficiently prevent the sensitive part from being dried. Moreover, since the electrode protector described in Patent Document 1 has a structure that is screwed to the body body, the volume is large. Therefore, when the electrode protector containing the preservative solution is screwed to the body body, when the sides are laid down, the sensitive part may be above the liquid surface of the preservative solution and may not be immersed in the preservative solution. . In addition, even when placed sideways, in order to ensure that the sensitive part is immersed in the storage solution, it is necessary to increase the amount of the electrode protection body filled with the storage solution.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electrode protector that can reliably prevent the sensitive part of the electrode body from being dried with the minimum necessary storage solution.

The present invention includes the following aspects.
[1] An electrode protector for protecting an electrode body having an electrode and an electrode cap that supports the electrode,
A bottomed cylindrical body into which the electrode is inserted, and a sealing material that is attached to the inner peripheral surface of the bottomed cylindrical body and can be in close contact with the electrode inserted into the bottomed cylindrical body;
When the electrode is inserted into the bottomed cylindrical body, the open end side of the bottomed cylindrical body is configured to contact the electrode cap, and the bottomed cylindrical body is attached with the sealing material to which the sealing material is attached An electrode protector in which a member is incorporated.
[2] The bottomed cylindrical body is detachably inserted into the through hole that communicates the inside and the outside of the bottomed cylindrical body on the bottom side with respect to the portion where the sealing material is attached. The electrode protector according to [1], comprising a pressure relief valve.
[3] The bottomed cylindrical body includes, in order from the bottom of the bottomed cylindrical body, a bottom member having a bottom, a sealing material attachment member connected to the bottom member and to which the sealing material is attached, and the sealing material attachment The electrode protector according to [1] or [2], wherein the intermediate member connected to the member and the open end member connected to the intermediate member are integrated.
[4] The bottomed cylinder is, in order from the bottom of the bottomed cylinder, a bottom member having a bottom, an intermediate member connected to the bottom member, a seal connected to the intermediate member, and a sealing material attached The electrode protector according to [1] or [2], wherein the material attaching member and the opening end member connected to the seal material attaching member are integrated.

  According to the electrode protector of the present invention, it is possible to reliably prevent the sensitive part of the electrode body from being dried with the minimum necessary storage solution. Moreover, it can respond | correspond suitably by changing arrangement | positioning and shape of each member which comprises an electrode protector according to the shape of an electrode.

One embodiment of the electrode protector of the present invention will be described.
FIG. 1 shows an electrode protector according to this embodiment. The electrode protector 1 is for protecting an electrode body having an electrode and an electrode cap that supports the electrode, and is attached to the bottomed cylinder 10 and the inner peripheral surface of the bottomed cylinder 10. And an O-ring 20 which is a sealing material.

<Bottom cylinder>
The bottomed cylindrical body 10 in the present embodiment includes a bottom member 11, a sealing material attachment member 12, an intermediate member 13, and an open end member 14, and is integrated with, for example, an adhesive.
The length of the inner hole of the bottomed cylindrical body 10 is longer than the electrode to be inserted. Further, the open end of the bottomed cylindrical body 10 is in contact with the electrode cap.
Moreover, the hole diameter of the bottomed cylindrical body 10 is larger than the outer diameter of the electrode to be inserted.

[Bottom member]
As shown in FIG. 2, the bottom member 11 in the present embodiment has a bottom 11 a having a semi-ellipsoidal longitudinal section.
On the inner peripheral surface 11b of the bottom member 11, a step A is formed at the opening opposite to the bottom 11a, and the inner diameter of the step A is larger than the inner diameter of the inner peripheral surface 11b.

[Sealant mounting member]
As shown in FIG. 3, the sealing material attaching member 12 is a tubular member, and has an O-ring accommodating groove 12 b for accommodating and attaching the O-ring 20 on the inner peripheral surface 12 a. As shown in FIG. 1, the sealing material attachment member 12 in this embodiment is connected to the bottom member 11.

The depth of the O-ring housing groove 12b is shallower than the outer diameter of the O-ring 20 in order to obtain a sealing effect with the electrode 2a by projecting the inner part of the O-ring 20 from the inner peripheral surface 12a.
Further, the sealing material attaching member 12 is provided with a through hole 12c that allows the inside and the outside of the sealing material attaching member 12 to communicate with each other.

  A pressure relief valve 12e is detachably inserted into the through hole 12c. The pressure relief valve 12e is made of rubber, for example. When inserting the pressure relief valve 12e into the through hole 12c of the sealing material mounting member 12, as shown in FIG. 4, the outer peripheral surface 12d of the sealing material mounting member 12 is prevented from leaking the storage liquid S. It is preferable that the formed recess 12g communicated with the through hole 12c is inserted with the packing 12f interposed.

  In the outer peripheral surface 12d of the sealing material attaching member 12, the outer diameters are smaller at the both end sides than the other portions, and stepped portions B and C are formed. Further, the stepped portion B has a shape that fits with the stepped portion A of the bottom member 11.

[Intermediate member]
The intermediate member 13 in the present embodiment is a tubular member connected to the sealing material attachment member 12.
As shown in FIG. 5, in the inner peripheral surface 13 a of the intermediate member 13, one end side (sealing material attachment member side) has an inner diameter larger than the other portions, and a step portion D is formed. The step portion D has a shape that fits with the step portion C of the sealing material mounting member 12.
Further, on the outer peripheral surface 13 b of the intermediate member 13, the other end side (opening end member side) has an outer diameter smaller than other portions, and a stepped portion E is formed.

[Open end member]
The open end member 14 in the present embodiment is a tubular member connected to the intermediate member 13 and forms the open end of the bottomed cylindrical body 10.
As shown in FIG. 6, the inner peripheral surface 14 a of the open end member 14 has inner diameters larger than the other portions on both end sides, and step portions F and G are formed. The stepped portion F has a shape that fits with the stepped portion E of the intermediate member 13, and the stepped portion G has a shape in which an electrode cap to which an electrode to be inserted into the bottomed tubular body 10 is attached is fitted.

[Material]
Examples of the material of the bottomed cylindrical body 10 include polycarbonate, polyethylene, polypropylene, polystyrene, acrylic resin, fluororesin, and polyethylene terephthalate. Among these, polycarbonate is preferable from the viewpoint of strength.

<O-ring>
The O-ring 20 is an annular seal member made of an elastic body. The O-ring 20 is housed and mounted in an O-ring housing groove 12b provided on the inner circumferential surface of the seal material mounting member 12, and can be brought into close contact with an electrode inserted into the bottomed cylindrical body 10.
Examples of elastic bodies constituting the O-ring include nitrile rubber, hydrogenated nitrile rubber, fluorine rubber, silicone rubber, ethylene propylene rubber, chloroprene rubber, acrylic rubber, butyl rubber, urethane rubber, chlorosulfonated polyethylene, epichlorohydrin rubber, natural For example, rubber.

<Assembly method>
The electrode protector of the present embodiment is assembled as follows, for example. That is, first, the O-ring 20 is attached to the O-ring housing groove 12 b of the seal material attachment member 12. Next, after applying an adhesive to the step A of the bottom member 11, the step B of the sealing material mounting member 12 is fitted to the step A, and the sealing material mounting member 12 is connected to the bottom member 11. . Next, after applying an adhesive to the step C of the sealing material mounting member 12, the step D of the intermediate member 13 is fitted into the step C, and the intermediate member 13 is connected to the sealing material mounting member 12. . Next, after applying an adhesive to the stepped portion E of the intermediate member 13, the stepped portion F of the opening end member 14 is fitted into the stepped portion E, and the opening end member 14 is connected to the intermediate member 13.
Contrary to the above assembly method, the intermediate member 13 is connected to the open end member 14, the sealing material attaching member 12 to which the O-ring 20 is attached in advance is connected to the intermediate member 13, and the bottom member 11 is connected to the sealing material attaching member 12. May be connected.

<How to use>
The case where the method of using the electrode protector 1 described above is used for a pH glass electrode will be described as an example.
As shown in FIG. 7, the electrode protector 1 has a bottomed cylindrical body in which an electrode 2a of an electrode body 2 having an electrode 2a having a glass film 2c as a sensitive portion at the tip and an electrode cap 2b having a diameter larger than that of the electrode 2a. 10 is used by being inserted. At that time, the O-ring 20 is in close contact with the outer peripheral surface of the electrode 2a. Further, the electrode cap 2b is fitted into the stepped portion G of the opening end member 14 of the bottomed cylindrical body 10, and the illustrated horizontal surface of the stepped portion G is in contact with the surface of the electrode cap 2b on the electrode protector 1 side. Further, the electrode protector 1 is filled with a storage solution S.

The electrode 2a is inserted into the electrode protector 1 by the following method. That is, first, the preservation solution S is filled in the electrode protector 1. Thereafter, the pressure release valve 12e is once removed, and the electrode 2a is placed on the electrode protector 1 side of the stepped portion G and the horizontal surface of the electrode cap 2b while the O-ring 20 of the electrode protector 1 is in close contact with the outer peripheral surface of the electrode 2a. Insert into the electrode protector 1 until the surface abuts.
After inserting the electrode 2 a into the electrode protector 1, the pressure relief valve 12 e is inserted into the through hole 12 c of the sealing material attaching member 12 again to prevent the storage liquid S from leaking.

  In the electrode protector 1 described above, when the electrode 2a is inserted, the O-ring 20 is in close contact with the portion of the electrode 2a on the glass film 2c side. Can be prevented from leaking to the side. In addition, the space portion filled with the preserving liquid S can be limited to the portion in the bottom member 11 and the portion closer to the bottom member 11 than the O-ring 20 of the seal member mounting member 12. That is, the volume of the space portion filled with the storage liquid S can be reduced, and only the vicinity of the glass film 2c side can be covered with the storage liquid S. Therefore, the filling amount of the storage solution can be reduced, and the storage solution S can be prevented from reaching the electrode cap 2b side even when the electrode 2a inserted into the electrode protector 1 is placed sideways. Thereby, as shown in FIG. 8, the liquid surface of the preservation solution S can be made high enough to immerse the glass film 2c, and the glass film 2c of the electrode body 2 can be obtained even with the minimum necessary preservation solution S. Can be surely prevented.

  In the electrode protector 1 described above, the length of the inner hole of the bottomed cylindrical body 10 is longer than that of the electrode 2a, and the open end side of the bottomed cylindrical body 10 is in contact with the electrode cap 2b. Therefore, the glass film 2c at the tip of the electrode 2a can be prevented from colliding with the bottom surface 10a of the bottomed cylindrical body 10. Further, since the electrode cap 2b is fitted into the stepped portion G, the electrode protector 1 that accommodates the electrode 2a is less likely to be laterally displaced.

  Further, since the electrode protector 1 has a through hole 12c with a pressure relief valve 12e attached to the bottom side from the O-ring housing groove 12b, a pressure is applied when the electrode 2a is inserted into the electrode protector 1. By removing the release valve 12e, the electrode 2a can be accommodated in the electrode protector 1 containing the storage liquid S while the air in the electrode protector 1 is being evacuated through the through hole 12c. Therefore, it is possible to prevent the storage liquid S from leaking from the O-ring 20 to the intermediate member 13 side due to the pressure increase in the electrode protector 1.

Moreover, since the bottomed cylindrical body 10 is one in which the sealing material attaching member 12 is incorporated, the O-ring 20 can be easily attached to the bottomed cylindrical body 10.
Furthermore, in the bottomed cylindrical body 10 in which the bottom member 11, the sealing material mounting member 12, the intermediate member 13, and the open end member 14 are integrated as in the above-described embodiment, a plurality of types of intermediate members having different lengths are used. If a plurality of 13 are prepared and the type of the intermediate member 13 to be used is changed according to the length of the electrode 2a, the bottomed cylindrical body 10 for electrodes having different lengths can be easily manufactured. Even when the lengths of the electrodes 2a are different, the bottom member 11 other than the intermediate member 13, the sealing material attaching member 12, and the open end member 14 can be common parts.

In addition, the electrode protector of this invention is not limited to embodiment mentioned above. For example, in the above-described embodiment, the step portion G is formed at the end portion of the opening end member 14, but as shown in FIG. 9, the step portion is not formed at the end portion of the opening end member 14, and the electrode body is formed. 4, the end surface 14 b of the open end member 14 may come into contact with the surface 4 d of the electrode cap 4 b on the electrode protector 1 side.
Thus, even when the end surface 14b of the open end member 14 comes into contact, the insertion length of the electrode 4a when the electrode 4a is inserted into the bottomed cylindrical body 30 can be regulated, It is possible to prevent the glass film 4c at the tip of the electrode 4a from colliding with the bottom surface 30a. However, in order to prevent the lateral displacement of the electrode protector 1 when the electrode 2a is accommodated, a step portion G for fitting the electrode cap 2b is formed on the opening end member 14 as in the above-described embodiment. Can be.

In the embodiment described above, the intermediate member 13 is provided, but the intermediate member 13 may be omitted. When the intermediate member 13 is omitted, the opening end member 14 can be lengthened so that the role of the intermediate member 13 is also achieved.
Moreover, the bottomed cylindrical body 10 has two or more through-holes 12c, and the pressure relief valve 12e may be attached to each through-hole 12c, or may not have the through-hole 12c depending on the case. .

In the electrode protector of the present invention, as shown in FIG. 10, the bottomed cylindrical body 40 is connected to the bottom member 11 having the bottom, the intermediate member 13 connected to the bottom member 11, and the intermediate member 13. Alternatively, the electrode protector 3 in which the sealing material attachment member 12 in which the pressure release valve 12e is inserted into the through hole 12c and the open end member 14 connected to the sealing material attachment member 12 may be integrated.
The electrode protector 3 including the bottomed tubular body 40 is assembled as follows, for example. That is, first, the O-ring 20 is attached to the O-ring housing groove 12 b of the seal material attachment member 12. Next, after applying an adhesive to the step A (see FIG. 2) of the bottom member 11, the step E (see FIG. 5) of the intermediate member 13 is fitted into the step A and the bottom member 11 is attached. The intermediate member 13 is connected. Next, after applying an adhesive to the step portion D of the intermediate member, the step portion B (see FIG. 3) of the seal material mounting member 12 is fitted into the step portion D, and the seal member mounting member is attached to the intermediate member 13. 12 is connected. Next, after applying an adhesive to the step C of the sealing material mounting member 12, the step F (see FIG. 6) of the opening end member 14 is fitted into the step C, and the sealing material mounting member 12 is attached. The open end member 14 is connected.

As shown in FIG. 11, the electrode protector including the bottomed cylindrical body 40 is suitable when the thin tube 6d having the glass film 6c at the tip accommodates the electrode 6a supported by the end-side support tube 6e. . When the thin tube 6d of the electrode 6a accommodates the electrode 6a supported by the terminal side support tube 6e, the electrode 6a is accommodated while the O-ring 20 is in close contact with the outer peripheral surface of the support tube 6e of the electrode 6a.
Also in the embodiment shown in FIG. 11, the electrode cap 6 b of the electrode body 6 is in contact with the surface of the electrode cap 6 b on the electrode protector 3 side of the stepped portion G of the open end member 14 of the bottomed tubular body 40. Therefore, it is possible to prevent the glass film 6c from colliding with the bottom surface 40a.

When the intermediate member 13 is disposed between the bottom member 11 and the seal member mounting member 12 as in the electrode protector 3 shown in FIG. 10, the through hole is formed on the seal member mounting member 12 side of the intermediate member 13. You may have.
Further, the intermediate member 13 of the bottomed cylindrical body 40 may be omitted. When the intermediate member 13 is omitted, the seal member mounting member 12 can be lengthened to serve as the intermediate member 13.

  In the above-described embodiment, the bottom member, the seal member mounting member, the intermediate member, and the open end member are connected by adhesion. They may be connected by screwing, or may be fitted with recesses and projections provided at the end of each member. However, since the components in the preservation solution are deposited in the portion that comes into contact with the preservation solution, the watertightness of the screw portion, the concave portion, or the convex portion may be impaired.

Further, the electrode protector of the present invention may be configured such that the length of the inner hole of the bottomed cylinder is shorter than that of the electrode so that the open end of the bottomed cylinder does not contact the electrode cap.
Thus, the electrode protector of the present invention can be appropriately handled by changing the arrangement and shape of each member constituting the electrode protector in accordance with the shape of the electrode.
Further, the sealing material which is one of the members constituting the electrode protector of the present invention is not limited to the above O-ring, and may be any material as long as it can seal a preservative solution. It can also be used.

  The electrode protected by the electrode protector of the present invention is not limited to a pH glass electrode using a glass film as a sensitive part, but can also be used for a pH composite electrode in which a glass electrode and a reference electrode are integrated. Moreover, it is not restricted to pH measurement, For example, it can use also for the electrode for an oxidation reduction potential or oxidation reduction current measurement, an ion concentration measurement, a dissolved oxygen concentration measurement, etc.

It is sectional drawing which shows one Embodiment of the electrode protector of this invention. It is sectional drawing which shows the bottom part member which comprises the electrode protector of embodiment of FIG. It is sectional drawing which shows the sealing material attachment member which comprises the electrode protector of embodiment of FIG. It is the figure which expanded the sealing material attachment member. It is sectional drawing which shows the intermediate member which comprises the electrode protector of embodiment of FIG. It is sectional drawing which shows the opening end member which comprises the electrode protector of embodiment of FIG. It is a figure explaining the usage method of the electrode protector of embodiment of FIG. It is a principal part enlarged view when the electrode protection body with which the preservation | save liquid was filled was turned sideways. It is sectional drawing which shows other embodiment of the electrode protector of this invention. It is a figure explaining the usage method of the electrode protector of embodiment of FIG. It is sectional drawing which shows other embodiment of the electrode protector of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,3 Electrode protective body 2,4,6 Electrode body 2a, 4a, 6a Electrode 2b, 4b, 6b Electrode cap 2c, 4c, 6c Glass film 6d Narrow tube 6e Support tube 10, 30, 40 Bottomed cylinder body 10a, 30a , 40a Bottom surface 11 Bottom member 11a Bottom portion 11b Inner peripheral surface 12 Sealing member attaching member 12a Inner peripheral surface 12b O-ring receiving groove 12c Through hole 12d Outer peripheral surface 13 Intermediate member 13a Inner peripheral surface 13b Outer peripheral surface 14 Open end member 14a Inner peripheral surface 20 O-ring A, B, C, D, E, F, G Step

Claims (4)

An electrode protector for protecting an electrode body having an electrode and an electrode cap that supports the electrode,
A bottomed cylindrical body into which the electrode is inserted, and a sealing material that is attached to the inner peripheral surface of the bottomed cylindrical body and can be in close contact with the electrode inserted into the bottomed cylindrical body;
When the electrode is inserted into the bottomed cylindrical body, the open end side of the bottomed cylindrical body is configured to contact the electrode cap, and the bottomed cylindrical body is attached with the sealing material to which the sealing material is attached An electrode protector in which a member is incorporated.   The bottomed cylindrical body has a through hole communicating with the inside and the outside of the bottomed cylindrical body on the bottom side from the portion where the sealing material is attached, and a pressure release valve that is detachably inserted into the through hole. The electrode protector according to claim 1, comprising:   The bottomed cylindrical body, in order from the bottom of the bottomed cylindrical body, a bottom member having a bottom, a sealing material mounting member connected to the bottom member, and attached to the sealing material, and connected to the sealing material mounting member The electrode protector according to claim 1 or 2, wherein the intermediate member made and the open end member connected to the intermediate member are integrated.   The bottomed cylindrical body includes, in order from the bottom of the bottomed cylindrical body, a bottom member having a bottom, an intermediate member connected to the bottom member, and a sealing material attaching member to which the sealing material is attached and connected to the intermediate member The electrode protector according to claim 1, wherein an opening end member connected to the sealing material attaching member is integrated.

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