Ion electrode, water quality measuring device, membrane component, and method for manufacturing ion electrode

Abstract

Provided is an ion electrode that detects specific ions in a target solution, the ion electrode including: a membrane part that has a permeable membrane through which ions permeate; and a body to which the membrane part is detachably attached. The membrane part further includes an inner cylinder that has an opening at the distal end thereof and an outer cylinder inside which the inner cylinder is disposed. The permeable membrane is disposed so as to cover the opening and is fixed to the inner cylinder and the outer cylinder by being sandwiched between the inner cylinder and the outer cylinder. The body includes a pushing part that is disposed inside the inner cylinder to push the permeable membrane.

Description

[Technical Field]

[0001] The present application relates to an ion electrode, a water quality measuring device, a membrane component, and a method for manufacturing an ion electrode. [Background technology]

[0002] Conventionally, for example, an ion electrode for detecting a specific ion in a target liquid includes a permeable membrane that allows ions to pass through, a main body to which the permeable membrane is attached, and a cylindrical membrane fixing device that fixes the permeable membrane by inserting the main body into the main body and sandwiching the permeable membrane between the main body and the membrane (for example, Patent Document 1). However, in the ion electrode disclosed in Patent Document 1, it is very difficult to attach the permeable membrane to the main body in such a way as to apply tension to the permeable membrane. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2016-53484 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide an ion electrode, a water quality measuring device, a membrane component, and a method for manufacturing an ion electrode, which enable the permeable membrane to be easily attached to the main body so as to apply tension to the permeable membrane. [Means for solving the problem]

[0005] The ion electrode is an ion electrode that detects specific ions in a target liquid, and comprises a membrane component having a permeable membrane that allows the ions to pass through, and a main body to which the membrane component is removably attached, the membrane component further comprising an inner cylinder having an opening at the tip, and an outer cylinder within which the inner cylinder is placed, the permeable membrane is positioned so as to cover the opening, and is fixed to the inner cylinder and the outer cylinder by being sandwiched between the inner cylinder and the outer cylinder, and the main body comprises a pushing part that is positioned inside the inner cylinder and pushes the permeable membrane.

[0006] The water quality measuring device also includes the ion electrode.

[0007] The membrane component is also used in the ion electrode.

[0008] Furthermore, a method for manufacturing an ion electrode is the above-described method for manufacturing an ion electrode, and includes attaching the membrane component to the main body so that the pushing portion pushes the permeable membrane. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an overall view of a water quality measuring device according to one embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a main part taken along line II-II in FIG. [Figure 3] FIG. 3 is an exploded view of FIG. [Figure 4] FIG. 4 is an enlarged view of the main part of FIG. [Figure 5] FIG. 5 is an exploded view of FIG. [Figure 6] FIG. 6 is an enlarged view of region VI in FIG. [Figure 7] FIG. 7 is an enlarged view of region VII in FIG. [Figure 8] FIG. 8 is a cross-sectional view of an ion electrode according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of a water quality measuring device, an ion electrode, a membrane component, and a method for manufacturing an ion electrode will be described with reference to Figures 1 to 7. Note that in each figure (as well as Figure 8), the dimensional ratios in the drawing do not necessarily match the actual dimensional ratios, and the dimensional ratios between the drawings do not necessarily match either.

[0011] 1, for example, the water quality measuring device 1 may include a detection unit 2 that detects the water quality of a target liquid that is the object of measurement, a device main body 3 that can communicate with the detection unit 2, and a communication means 4 that can communicate between the detection unit 2 and the device main body 3. For example, as in this embodiment, the device main body 3 may include an input unit 3a to which information is input, a processing unit 3b that processes the information, and an output unit 3c that outputs the information.

[0012] The communication means 4 may be, for example, a wired communication means (e.g., a cable) as in this embodiment, or may be, for example, a wireless communication means. The detection unit 2 and the device main body 3 may be integrally configured.

[0013] The input unit 3a is not particularly limited, but may be, for example, a button, a touch panel, etc. Then, for example, information instructing the start of measurement may be input to the input unit 3a.

[0014] The processing unit 3b may include, for example, a processor such as a CPU and an MPU, memories such as a ROM and a RAM, various interfaces, etc. Specifically, the processing unit 3b may include, for example, an acquisition unit that acquires information from the detection unit 2 and the input unit 3a, etc., a storage unit that stores the information, a calculation unit that calculates the information (for example, water quality values), and a control unit that controls each unit of the water quality measuring device 1 (for example, the output unit 3c).

[0015] The output unit 3c is not particularly limited, and can be, for example, a display device, etc. The output unit 3c may also be, for example, a transmitting means that outputs (transmits) a signal to the outside of the water quality measuring device 1. The output unit 3c may also output the measurement results (for example, water quality values), etc.

[0016] 1 to 3, the detection unit 2 includes ion electrodes 5, 6, and 7 that detect ions in the target liquid. Specifically, the detection unit 2 includes at least an ion electrode 5 that detects a first ion (e.g., ion concentration) in the target liquid. Note that the detection unit 2 may also include other ion electrodes 6 and 7 that detect ions different from the first ion, or may also include other water quality sensors that detect water quality items other than ions (e.g., dissolved oxygen, pH, conductivity, turbidity, temperature, etc.).

[0017] Although not particularly limited, for example, in this embodiment, the detection unit 2 includes first to third ion electrodes 5, 6, and 7 for measuring the potentials of the first to third ions in the subject liquid, respectively, and a reference electrode 8 for measuring a reference potential. The ions detected by the ion electrodes 5, 6, and 7 are not particularly limited, but may be, for example, ammonium ions, nitrate ions, potassium ions, chloride ions, calcium ions, sodium ions, etc.

[0018] For example, as in this embodiment, the detection unit 2 may include a detection unit main body 9 that houses the ion electrodes 5, 6, and 7 and the reference electrode 8, and a holder 10 that is detachable from the detection unit main body 9 and holds the ion electrodes 5, 6, and 7 and the reference electrode 8. For example, the ion electrodes 5, 6, and 7 and the reference electrode 8 may be partially exposed from the tip of the detection unit 2 (in this embodiment, from the opening of the holder 10).

[0019] This allows ions in the target liquid to be detected by immersing the tip of the detection unit 2, i.e., the exposed portions of the ion electrodes 5, 6, and 7 and the reference electrode 8, in the target liquid. The target liquid is not particularly limited, and the detection unit 2 may be attached to a frame or the like to detect ions in liquids such as treated sewage water (e.g., aerobic tank water, anaerobic tank water, influent tank water), treated human waste water, semiconductor factory wastewater, chemical product factory wastewater, food factory wastewater, water taken from rivers or reservoirs, well water or groundwater, fish farm pens and wastewater, liquid fertilizer and its wastewater from plant factories, etc. Alternatively, for example, the detection unit 2 may be held by a measurer and detect ions in a test liquid placed in a container.

[0020] 3 and 4, the ion electrodes 5 and 6 include a membrane component 12 having a permeable membrane 11 that allows ions to pass through, and a main body 13 to which the membrane component 12 is removably attached. The ion electrodes 5 and 6 may also include, for example, a responsive membrane 14 fixed to the tip of the main body 13, an internal electrode 15 disposed inside the main body 13, and an internal liquid 16 sealed inside the main body 13 and immersing the internal electrode 15.

[0021] 4 and 5, the membrane component 12 includes an inner cylinder 17 having an opening 17a at its tip, and an outer cylinder 18 in which the inner cylinder 17 is disposed. The permeable membrane 11 is disposed so as to cover the opening 17a of the inner cylinder 17. The permeable membrane 11 is fixed to the inner cylinder 17 and the outer cylinder 18 by being sandwiched between the inner cylinder 17 and the outer cylinder 18.

[0022] For example, as in this embodiment, the tip surface of inner cylinder 17 and the tip surface of outer cylinder 18 may be arranged to be flush with each other. Also, as in this embodiment, inner cylinder 17 may include a cylindrical main body portion 17b that is formed in a cylindrical shape and arranged inside outer cylinder 18, and protrusion 17c that protrudes outward from the outer periphery of cylindrical main body portion 17b.

[0023] It is preferable that the permeable membrane 11 has a configuration, for example, as in this embodiment, which includes a cover portion 11a that covers the opening 17a of the inner cylinder 17, a first clamped portion 11b that is arranged outside the cover portion 11a and is clamped between the outer periphery of the cylinder main body portion 17b of the inner cylinder 17 and the inner periphery of the outer cylinder 18, and a second clamped portion 11c that is arranged outside the first clamped portion 11b and is clamped between the protruding portion 17c of the inner cylinder 17 and the base end portion 18a of the outer cylinder 18.

[0024] As a result, the permeable membrane 11 is sandwiched not only between the outer periphery of the cylindrical main body 17b of the inner cylindrical body 17 and the inner periphery of the outer cylindrical body 18, but also between the protruding portion 17c of the inner cylindrical body 17 and the base end portion 18a of the outer cylindrical body 18. Therefore, for example, the permeable membrane 11 can be reliably fixed to the inner cylindrical body 17 and the outer cylindrical body 18.

[0025] Furthermore, there are no particular limitations on the materials that make up the inner cylinder 17 and the outer cylinder 18. The inner cylinder 17 may be made of, for example, a metal or a hard resin, and the outer cylinder 18 may be made of, for example, a metal, a hard resin, or an elastic resin. The materials that make up the inner cylinder 17 and the outer cylinder 18 may be the same or different. Although there are no particular limitations on this, the membrane component 12 may be provided with a seal (for example, an O-ring or a packing) to seal the gap between the inner cylinder 17 and the outer cylinder 18.

[0026] The permeable membrane 11 may have, for example, a function of protecting the responsive membrane 14. Specifically, the permeable membrane 11 may be configured to allow ions in the target liquid to pass through while not allowing suspended matter or microorganisms in the target liquid to pass through.

[0027] The permeable membrane 11 may be a membrane made of, for example, a fluororesin. The permeable membrane 11 may also be a membrane made of other materials than fluororesin. For example, the permeable membrane 11 may be a membrane made of a resin or silicone that is resistant to absorbing the plasticizer contained in the responsive membrane 14 and has a predetermined ductility, or the permeable membrane 11 may be a membrane made of polyethylene, polypropylene, or the like.

[0028] Depending on the application, the permeable membrane 11 may be formed of, for example, a metal mesh. If bubbles trapped between the metal mesh become a problem, the permeable membrane 11 is preferably formed of a fluorine-based resin, silicone, polyethylene, polypropylene, or the like. The pore size of the permeable membrane 11 is preferably as small as possible, and is not particularly limited, but is preferably 0.5 μm or less, for example.

[0029] The main body 13 may include, for example, a cylindrical base portion 13a that accommodates the internal electrode 15 and the internal liquid 16 therein, and a protrusion portion 13b that protrudes from the outer periphery of the base portion 13a, as in the present embodiment. The material that constitutes the main body 13 is not particularly limited, and the main body 13 may be formed of, for example, metal or hard resin. Furthermore, the main body 13 may include, at its tip, an opening 13c and an annular groove 13d that is disposed outside the opening 13c, as in the present embodiment.

[0030] The responsive membrane 14 may be fixed to the tip of the main body 13 so as to cover the opening 13c of the main body 13 in order to enclose the internal liquid 16 inside the main body 13. In this way, the responsive membrane 14 electrically insulates the target liquid from the internal electrode 15, and the internal liquid 16 is disposed between the responsive membrane 14 and the internal electrode 15.

[0031] For example, as in this embodiment, the central part of the response membrane 14 may close the opening 13c of the main body 13, and the outer periphery of the response membrane 14 may close the groove 13d of the main body 13. Furthermore, the outer surface of the response membrane 14 may be convex toward the tip side.

[0032] There are no particular limitations on the materials constituting the response membrane 14, the internal electrode 15, and the internal liquid 16. For example, in an ion electrode 5 that detects ammonium ions, the internal liquid 16 may contain, for example, ammonium chloride, the internal electrode 15 may be, for example, an Ag / AgCl electrode, and the response membrane 14 may be, for example, a membrane that selectively responds to ammonium ions and has properties as a semipermeable membrane.

[0033] Although not particularly limited, for example, the responsive membrane 14 may be formed by adhering the membrane member to the main body 13 via an adhesive. Specifically, for example, the responsive membrane 14 may be formed by applying adhesive to the groove 13d of the main body 13, and then dissolving and bonding the main body 13 and the membrane member to each other with the adhesive. Note that, for example, when a membrane member that had a uniform thickness is dissolved by the adhesive, the thickness of the peripheral part of the membrane member may become thinner than the thickness of the central part of the membrane member.

[0034] The membrane member may also include, for example, a substrate made of vinyl chloride or the like, an ionophore contained in the substrate that selectively reacts only with specific ions (e.g., ammonium ions, potassium ions), and a plasticizer contained in the substrate for softening the vinyl chloride, etc. That is, the responsive membrane 14 may include, for example, a substrate made of vinyl chloride or the like, and an ionophore contained in the substrate that selectively reacts only with specific ions.

[0035] The ion electrode 5 also includes an attachment mechanism 19 for removably attaching the membrane component 12 to the main body 13. This allows the membrane component 12 to be attached to the main body 13, for example, to change from the state shown in FIG. 5 to the state shown in FIG. 4, or the membrane component 12 to be detached from the main body 13, for example, to change from the state shown in FIG. 4 to the state shown in FIG. 5. Although not particularly limited, the ion electrode 5 may include a seal (for example, an O-ring or a packing) for sealing the gap between the membrane component 12 (specifically, the inner cylindrical body 17) and the main body 13.

[0036] Furthermore, there are no particular limitations on the configuration of the attachment mechanism 19. For example, as in this embodiment, the inner cylinder 17 of the membrane component 12 may have a female screw 19a on its inner periphery, and the base 13a of the main body 13 may have a male screw 19b on its outer periphery that screws into the female screw 19a, and the attachment mechanism 19 may be a screw mechanism made up of the female screw 19a and the male screw 19b.

[0037] For example, the attachment mechanism 19 may be configured to have a stopper that protrudes from one of the membrane part 12 (e.g., inner cylinder 17) and the main body 13 and stops the other so as to prevent the membrane part 12 from moving relative to the main body 13. In such a configuration, the other may have a recess (e.g., a groove) that is positioned inside and can be stopped by the stopper.

[0038] The main body 13 is provided with a pushing portion 13e that pushes the permeable membrane 11. For example, as in this embodiment, the pushing portion 13e may be arranged at the tip of the base portion 13a, and when the membrane component 12 is attached to the main body 13, the pushing portion 13e may be arranged inside the inner cylindrical body 17 and protrude from the inner cylindrical body 17 toward the tip side.

[0039] As a result, when the membrane component 12 is attached to the main body 13, the pushing portion 13e pushes the permeable membrane 11, thereby applying tension to the permeable membrane 11. Therefore, the permeable membrane 11 can be easily attached to the main body 13 so that tension is applied to the permeable membrane 11. As a result, the ion electrode 5 in which tension is applied to the permeable membrane 11 can be easily manufactured.

[0040] The direction in which the pushing portion 13e pushes the permeable membrane 11 is the direction in which the main body 13 moves relative to the membrane component 12 when the membrane component 12 is attached to the main body 13. The pushing portion 13e may push the permeable membrane 11, for example, via another member (in this embodiment, the responsive membrane 14), or may push the permeable membrane 11 directly, for example.

[0041] Incidentally, in this embodiment, while the pushing portion 13e pushes the permeable membrane 11, not only the first clamped portion 11b but also the second clamped portion 11c of the permeable membrane 11 are clamped between the inner cylinder 17 and the outer cylinder 18. This makes it possible to prevent the permeable membrane 11 from shifting position relative to the inner cylinder 17 and the outer cylinder 18, and therefore makes it possible to apply a desired tension to the permeable membrane 11, for example.

[0042] The first sandwiched portion 11b is sandwiched between the inner cylinder 17 and the outer cylinder 18 in a direction perpendicular to the direction in which the pushing portion 13e pushes the permeable membrane 11. That is, in a cross section along the direction in which the pushing portion 13e pushes the permeable membrane 11 (see FIG. 4), the first sandwiched portion 11b is arranged extending in a direction parallel to the direction in which the pushing portion 13e pushes the permeable membrane 11.

[0043] The second sandwiched portion 11c is sandwiched between the inner cylinder 17 and the outer cylinder 18 in a direction parallel to the direction in which the pushing portion 13e pushes the permeable membrane 11. That is, in a cross section along the direction in which the pushing portion 13e pushes the permeable membrane 11 (see FIG. 4), the second sandwiched portion 11c is arranged extending in a direction perpendicular to the direction in which the pushing portion 13e pushes the permeable membrane 11.

[0044] Although not particularly limited, in this embodiment, the membrane component 12 is attached to the main body 13 so that the membrane component 12 abuts against the protrusion 13b of the main body 13, thereby applying a desired tension to the permeable membrane 11. This makes it possible to easily position the membrane component 12, for example.

[0045] Furthermore, when the pushing portion 13e pushes the permeable membrane 11, the tip of the pushing portion 13e comes into contact with the permeable membrane 11. Therefore, it is preferable that the pushing portion 13e has a chamfered portion 13f on the outer periphery of the tip. This allows the permeable membrane 11 to come into contact with the chamfered portion 13f of the pushing portion 13e, thereby preventing the permeable membrane 11 from being damaged.

[0046] As shown in Fig. 6, the inner cylinder 17 is preferably configured to have a chamfered portion 17d on the outer peripheral edge of the tip, and as shown in Fig. 7, the outer cylinder 18 is preferably configured to have a chamfered portion 18b on the inner peripheral edge of the base end. With this, even if the permeable membrane 11 moves or is displaced relative to the inner cylinder 17 and the outer cylinder 18 when the membrane component 12 is attached to the main body 13, the permeable membrane 11 comes into contact with the chamfered portions 17d and 18b, and damage to the permeable membrane 11 can be suppressed.

[0047] Although not particularly limited, as in this embodiment, the outer peripheral surface of the cylindrical main body 17b of the inner cylindrical body 17 may be formed as a smooth surface without any irregularities, and the inner peripheral surface of the outer cylindrical body 18 may be formed as a smooth surface without any irregularities. Here, the "smooth surface" refers to a surface that allows the outer cylindrical body 18 to slide axially relative to the inner cylindrical body 17 with the permeable membrane 11 interposed between the inner cylindrical body 17 and the outer cylindrical body 18.

[0048] As a result, for example, the permeable membrane 11 can be interposed between the inner cylinder 17 and the outer cylinder 18, and the outer cylinder 18 can be slid onto the inner cylinder 17, thereby fixing the permeable membrane 11 to the inner cylinder 17 and the outer cylinder 18. Furthermore, when fixing the permeable membrane 11 between the inner cylinder 17 and the outer cylinder 18, the permeable membrane 11 comes into contact with the chamfered portions 17d and 18b, and therefore damage to the permeable membrane 11 can be prevented.

[0049] From the above, as in this embodiment, the ion electrode 5 is an ion electrode 5 that detects specific ions in a target liquid, and is preferably configured as follows: the ion electrode 5 includes a membrane component 12 having a permeable membrane 11 that is permeable to the ions; and a main body 13 to which the membrane component 12 is removably attached; the membrane component 12 further includes an inner cylinder 17 having an opening 17a at the tip thereof, and an outer cylinder 18 within which the inner cylinder 17 is disposed; the permeable membrane 11 is disposed so as to cover the opening 17a, and is fixed to the inner cylinder 17 and the outer cylinder 18 by being sandwiched between the inner cylinder 17 and the outer cylinder 18; and the main body 13 is preferably configured as follows: the inner cylinder 17 includes a pressing portion 13e that is disposed within the inner cylinder 17 and presses the permeable membrane 11.

[0050] According to this configuration, the permeable membrane 11 is fixed to the inner cylinder 17 and the outer cylinder 18 by being sandwiched between them. When the membrane component 12 is attached to the main body 13, the pushing portion 13e pushes the permeable membrane 11, thereby applying tension to the permeable membrane 11. This makes it easy to attach the permeable membrane 11 to the main body 13 so as to apply tension to the permeable membrane 11.

[0051] Furthermore, as in this embodiment, in the ion electrode 5, the inner cylinder 17 preferably includes a cylindrical main body portion 17b and a protruding portion 17c protruding outward from the outer periphery of the cylindrical main body portion 17b, and the permeable membrane 11 is sandwiched between the outer periphery of the cylindrical main body portion 17b and the inner periphery of the outer cylinder 18, and is also sandwiched between the protruding portion 17c and the base end portion 18a of the outer cylinder 18.

[0052] According to this configuration, the permeable membrane 11 is not only sandwiched between the outer periphery of the cylindrical main body 17b and the inner periphery of the outer cylindrical body 18, but also between the protruding portion 17c and the base end portion 18a of the outer cylindrical body 18. As a result, by attaching the membrane component 12 to the main body 13, it is possible to prevent the permeable membrane 11 from shifting position relative to the inner cylindrical body 17 and the outer cylindrical body 18 when the pushing portion 13e pushes the permeable membrane 11.

[0053] In the ion electrode 5, as in this embodiment, it is preferable that the outer cylindrical body 18 has a chamfered portion 18b on the inner peripheral edge of the base end.

[0054] According to this configuration, for example, when the permeable membrane 11 is fixed between the inner cylinder 17 and the outer cylinder 18, or when the permeable membrane 11 is fixed between the inner cylinder 17 and the outer cylinder 18, the permeable membrane 11 comes into contact with the chamfered portion 18b of the outer cylinder 18. This makes it possible to prevent the permeable membrane 11 from being damaged.

[0055] In the ion electrode 5, as in this embodiment, it is preferable that the inner cylindrical body 17 has a chamfered portion 17d on the outer periphery of the tip.

[0056] According to this configuration, for example, when the permeable membrane 11 is fixed between the inner cylinder 17 and the outer cylinder 18, or when the permeable membrane 11 is fixed between the inner cylinder 17 and the outer cylinder 18, the permeable membrane 11 comes into contact with the chamfered portion 17d of the inner cylinder 17. This makes it possible to prevent the permeable membrane 11 from being damaged.

[0057] In the ion electrode 5, as in this embodiment, it is preferable that the pushing portion 13e has a chamfered portion 13f on the outer periphery of the tip.

[0058] According to this configuration, for example, when the membrane component 12 is attached to the main body 13, the tensioned permeable membrane 11 comes into contact with the chamfered portion 13f of the pushing portion 13e, thereby preventing the permeable membrane 11 from being damaged.

[0059] The water quality measuring device 1, ion electrode 5, and membrane component 12 are not limited to the configurations of the above-described embodiment, nor are they limited to the above-described effects. Furthermore, the water quality measuring device 1, ion electrode 5, and membrane component 12 can, of course, be modified in various ways without departing from the spirit of the present invention. For example, it is of course possible to arbitrarily select one or more of the configurations, methods, etc. of the various modified examples described below and employ them in the configurations, methods, etc. of the above-described embodiment.

[0060] (1) In the ion electrode 5 according to the above embodiment, the attachment mechanism 19 is configured as a screw mechanism consisting of the female screw 19a of the membrane component 12 and the male screw 19b of the main body 13. However, the ion electrode 5 is not limited to this configuration. For example, the attachment mechanism 19 may be configured such that the membrane component 12 and the main body 13 are separate members.

[0061] (2) In the ion electrode 5 according to the above embodiment, the internal electrode 15 and the internal liquid 16 are arranged inside the main body 13. However, the ion electrode 5 is not limited to this configuration. For example, the internal electrode 15 and the internal liquid 16 may be arranged outside the main body 13.

[0062] (3) In the ion electrode 5 according to the above embodiment, the main body 13 (specifically, the base portion 13a), the inner cylinder 17 (specifically, the cylinder main body portion 17b), and the outer cylinder 18 are each configured to be cylindrical. However, the ion electrode 5 is not limited to this configuration. For example, the main body 13 (specifically, the base portion 13a), the inner cylinder 17 (specifically, the cylinder main body portion 17b), and the outer cylinder 18 may each be configured to be rectangular tubular.

[0063] (4) Furthermore, in the membrane component 12 according to the above embodiment, the permeable membrane 11 is configured to include not only the first clamped portion 11b but also the second clamped portion 11c. However, the membrane component 12 is not limited to this configuration. For example, the permeable membrane 11 may be configured to include the first clamped portion 11b but not the second clamped portion 11c.

[0064] (5) Furthermore, in the membrane component 12 according to the above embodiment, the outer peripheral surface of the tube main body 17b of the inner tube 17 is formed as a smooth surface without any irregularities, and the inner peripheral surface of the outer tube 18 is formed as a smooth surface without any irregularities. However, the membrane component 12 is not limited to this configuration. For example, the tube main body 17b of the inner tube 17 may have a male thread on its outer peripheral portion, and the outer tube 18 may have a female thread on its inner peripheral portion that screws into the male thread.

[0065] (6) Furthermore, in the membrane component 12 according to the above embodiment, the first sandwiched portion 11b is sandwiched between the inner cylinder 17 and the outer cylinder 18 in a direction perpendicular to the direction in which the pushing portion 13e pushes the permeable membrane 11. However, the membrane component 12 is not limited to this configuration.

[0066] 8, the first sandwiched portion 11b may be sandwiched between the inner cylinder 17 and the outer cylinder 18 in a direction oblique to the direction in which the pushing portion 13e pushes the permeable membrane 11. That is, in a cross section along the direction in which the pushing portion 13e pushes the permeable membrane 11 (see FIG. 8), the first sandwiched portion 11b may be arranged to extend in a direction oblique to the direction in which the pushing portion 13e pushes the permeable membrane 11.

[0067] (7) Furthermore, in the membrane component 12 according to the above embodiment, the second clamped portion 11c is configured to be clamped between the inner cylinder 17 and the outer cylinder 18 in a direction parallel to the direction in which the pushing portion 13e pushes the permeable membrane 11. However, the membrane component 12 is not limited to this configuration.

[0068] 8, the second sandwiched portion 11c may be sandwiched between the inner cylinder 17 and the outer cylinder 18 in a direction oblique to the direction in which the pushing portion 13e pushes the permeable membrane 11. That is, in a cross section along the direction in which the pushing portion 13e pushes the permeable membrane 11 (see FIG. 8), the second sandwiched portion 11c may be arranged to extend in a direction oblique to the direction in which the pushing portion 13e pushes the permeable membrane 11.

[0069] 1...water quality measuring device, 2...detection unit, 3...device main body, 3a...input unit, 3b...processing unit, 3c...output unit, 4...communication means, 5...ion electrode, 6...ion electrode, 7...ion electrode, 8...reference electrode, 9...detection unit main body, 10...holding unit, 11...permeable membrane, 11a...cover unit, 11b...first clamped portion, 11c...second clamped portion, 12...membrane component, 13...main body, 13a... Base portion, 13b...protrusion portion, 13c...opening, 13d...groove, 13e...pressing portion, 13f...chamfered portion, 14...responsive membrane, 15...internal electrode, 16...internal liquid, 17...inner cylinder, 17a...opening, 17b...cylinder main body portion, 17c...protrusion portion, 17d...chamfered portion, 18...outer cylinder, 18a...base end portion, 18b...chamfered portion, 19...mounting mechanism, 19a...female thread, 19b...male thread

Claims

1. An ion electrode for detecting a specific ion in a target liquid, a membrane component having a permeable membrane that allows the ions to pass through; a body to which the membrane component is removably attached; the membrane component further includes an inner cylinder having an opening at a tip thereof, and an outer cylinder having the inner cylinder disposed therein; the permeable membrane is disposed so as to cover the opening, and is fixed to the inner cylinder and the outer cylinder by being sandwiched between the inner cylinder and the outer cylinder; The main body is an ion electrode having a pushing portion disposed inside the inner cylindrical body and pushing the permeable membrane, The inner cylindrical body has a chamfered portion on the outer circumferential edge of the tip thereof.

2. An ion electrode for detecting a specific ion in a target liquid, a membrane component having a permeable membrane that allows the ions to pass through; a body to which the membrane component is removably attached; the membrane component further includes an inner cylinder having an opening at a tip thereof, and an outer cylinder having the inner cylinder disposed therein; the permeable membrane is disposed so as to cover the opening, and is fixed to the inner cylinder and the outer cylinder by being sandwiched between the inner cylinder and the outer cylinder; The main body is an ion electrode having a pushing portion disposed inside the inner cylindrical body and pushing the permeable membrane, The inner cylinder includes a cylindrical main body portion formed in a cylindrical shape and a protrusion portion protruding outward from an outer periphery of the cylindrical main body portion, The permeable membrane is sandwiched between the outer periphery of the cylindrical main body and the inner periphery of the outer cylindrical body, and is also sandwiched between the protrusion and the base end of the outer cylindrical body.

3. The ion electrode according to claim 2 , wherein the outer cylinder has a chamfered portion on an inner peripheral edge of a base end.

4. The ion electrode according to any one of claims 1 to 3, wherein the pushing portion has a chamfered portion on an outer circumferential edge of a tip end.

5. A water quality measuring device comprising the ion electrode according to any one of claims 1 to 4.

6. A membrane component used in the ion electrode according to any one of claims 1 to 4.

7. A method for producing the ion electrode according to any one of claims 1 to 4, and attaching the membrane component to the body so that the pushing portion pushes the permeable membrane.

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