JP7811215B2 - Ion electrode, water quality measuring device, membrane component, and method for manufacturing ion electrode - Google Patents

Description

This application relates to an ion electrode, a water quality measuring device, a membrane component, and a method for manufacturing an ion electrode.

Conventionally, for example, in order to detect specific ions in a target liquid, an ion electrode 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 device and sandwiching the membrane between the main body and the device (see, for example, Patent Document 1). However, with the ion electrode described in Patent Document 1, it is extremely difficult to attach the permeable membrane to the main body in a way that applies tension to the membrane.

Japanese Patent Application Publication No. 2016-53484

The objective is to provide an ion electrode, a water quality measuring device, a membrane component, and a method for manufacturing an ion electrode that allows the permeable membrane to be easily attached to the main body so as to apply tension to the permeable membrane.

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 comprises 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 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 comprises a pushing portion that is positioned inside the inner cylinder and pushes the permeable membrane.

The water quality measuring device also includes the above-mentioned ion electrode.

Membrane components are also used in the ion electrodes mentioned above.

Furthermore, a method for manufacturing an ion electrode is a method for manufacturing an ion electrode as described above, which includes attaching the membrane component to the main body so that the pushing portion pushes the permeable membrane.

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

One embodiment of a water quality measuring device, ion electrode, membrane component, and method for manufacturing an ion electrode will be described below 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.

As shown in FIG. 1, for example, the water quality measuring device 1 may include a detection unit 2 that detects the water quality of the target liquid to be measured, 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. The device main body 3 may include, for example, as in this embodiment, 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.

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 configured as an integrated unit.

The input unit 3a is not particularly limited, but can be, for example, a button, a touch panel, etc. Furthermore, information such as an instruction to start measurement may be input into the input unit 3a.

The processing unit 3b may include, for example, a processor such as a CPU and an MPU, memory 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 memory unit that stores the information, a calculation unit that calculates the information (e.g., water quality values), and a control unit that controls each part of the water quality measuring device 1 (e.g., the output unit 3c).

The output unit 3c is not particularly limited, and can be, for example, a display device. The output unit 3c may also be, for example, a transmitting means for outputting (transmitting) 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.

As shown in Figures 1 to 3, the detection unit 2 is equipped with ion electrodes 5, 6, and 7 that detect ions in the target liquid. Specifically, the detection unit 2 is equipped with 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 be equipped with other ion electrodes 6 and 7 that detect ions different from the first ion, or may be equipped with other water quality sensors that detect water quality items other than ions (e.g., dissolved oxygen, pH, conductivity, turbidity, temperature, etc.).

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 target liquid, respectively, and a reference electrode 8 for measuring the 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.

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

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 structure 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 factory wastewater, food factory wastewater, water taken from rivers or reservoirs, well water or groundwater, fish farm ponds and wastewater, liquid fertilizer and its wastewater from plant factories, etc. Alternatively, the detection unit 2 may be held by the user and detect ions in a test liquid placed in a container.

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 response 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.

As shown in Figures 4 and 5, the membrane component 12 comprises an inner cylinder 17 having an opening 17a at its tip, 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 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 them.

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

In this embodiment, the permeable membrane 11 preferably has 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 sandwiched 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 sandwiched between the protruding portion 17c of the inner cylinder 17 and the base end portion 18a of the outer cylinder 18.

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 securely fixed to the inner cylindrical body 17 and the outer cylindrical body 18.

Furthermore, the materials constituting the inner cylinder 17 and the outer cylinder 18 are not particularly limited. The inner cylinder 17 may be formed of, for example, metal or hard resin, and the outer cylinder 18 may be formed of, for example, metal, hard resin, or elastic resin. The materials constituting the inner cylinder 17 and the outer cylinder 18 may be the same or different. Although not particularly limited, 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.

The permeable membrane 11 may, for example, have the 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 blocking suspended matter and microorganisms in the target liquid.

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 besides 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. The permeable membrane 11 may also be a membrane made of, for example, polyethylene or polypropylene.

Depending on the application, the permeable membrane 11 may be formed, for example, from a metal mesh. If air bubbles trapped between the metal mesh become a problem, the permeable membrane 11 is preferably formed from a fluororesin, 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.

For example, as in this embodiment, the main body 13 may include a cylindrical base portion 13a that houses the internal electrode 15 and internal liquid 16, and a protrusion portion 13b that protrudes from the outer periphery of the base portion 13a. 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, as in this embodiment, the main body 13 may include, at its tip, an opening 13c and an annular groove 13d that is located outside the opening 13c.

The response 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 seal the internal liquid 16 inside the main body 13. In this way, the response membrane 14 electrically insulates the target liquid from the internal electrode 15, and also positions the internal liquid 16 between the response membrane 14 and the internal electrode 15.

For example, as in this embodiment, the central portion 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. In addition, the outer surface of the response membrane 14 may be convex toward the tip.

The materials constituting the response membrane 14, internal electrode 15, and internal liquid 16 are not particularly limited. 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 the properties of a semipermeable membrane.

For example, the response membrane 14 may be formed by adhering the membrane member to the main body 13 via an adhesive, without any particular limitation. Specifically, the response 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 together with the adhesive. Note that, for example, when a membrane member that was of uniform thickness is dissolved by the adhesive, the thickness of the peripheral portion of the membrane member may become thinner than the thickness of the central portion of the membrane member.

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

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, from the state shown in Figure 5 to the state shown in Figure 4, or removed from the main body 13, for example, from the state shown in Figure 4 to the state shown in Figure 5. Although not particularly limited, the ion electrode 5 may also include a seal (e.g., an O-ring or a gasket) to seal the gap between the membrane component 12 (specifically, the inner cylinder 17) and the main body 13.

Furthermore, the configuration of the attachment mechanism 19 is not particularly limited. For example, as in this embodiment, the inner cylinder 17 of the membrane component 12 may have a female thread 19a on its inner periphery, and the base portion 13a of the main body 13 may have a male thread 19b on its outer periphery that threads into the female thread 19a, and the attachment mechanism 19 may be a screw mechanism consisting of the female thread 19a and the male thread 19b.

For example, the attachment mechanism 19 may be configured to have a stopper that protrudes from one of the membrane component 12 (e.g., inner cylinder 17) and the main body 13 and stops the other to prevent the membrane component 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.

The main body 13 is equipped 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, it may be arranged inside the inner cylinder 17 and protrude from the inner cylinder 17 toward the tip.

As a result, when the membrane component 12 is attached to the main body 13, the pushing portion 13e presses the permeable membrane 11, 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, an ion electrode 5 in which tension is applied to the permeable membrane 11 can be easily manufactured.

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 also push the permeable membrane 11, for example, via another member (in this embodiment, the response membrane 14), or it may also push the permeable membrane 11 directly, for example.

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 prevents the permeable membrane 11 from shifting position relative to the inner cylinder 17 and the outer cylinder 18, making it possible to apply a desired tension to the permeable membrane 11, for example.

The first clamped 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 Figure 4), the first clamped portion 11b is arranged extending in a direction parallel to the direction in which the pushing portion 13e pushes the permeable membrane 11.

The second clamped 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 Figure 4), the second clamped portion 11c is arranged extending in a direction perpendicular to the direction in which the pushing portion 13e pushes the permeable membrane 11.

In this embodiment, although not particularly limited, the desired tension can be applied to the permeable membrane 11 by attaching the membrane component 12 to the main body 13 so that the membrane component 12 abuts the protrusion 13b of the main body 13. This makes it possible, for example, to easily position the membrane component 12.

In addition, 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 be configured with a chamfered portion 13f on the outer periphery of the tip. This prevents the permeable membrane 11 from being damaged because the permeable membrane 11 comes into contact with the chamfered portion 13f of the pushing portion 13e.

As shown in Figure 6, the inner cylinder 17 is preferably configured with a chamfered portion 17d on the outer peripheral edge of the tip, and as shown in Figure 7, the outer cylinder 18 is preferably configured with a chamfered portion 18b on the inner peripheral edge of the base end. This ensures that even if the permeable membrane 11 moves or shifts position relative to the inner cylinder 17 and outer cylinder 18 when the membrane component 12 is attached to the main body 13, the permeable membrane 11 will come into contact with the chamfered portions 17d and 18b, preventing damage to the permeable membrane 11.

In addition, although not particularly limited, as in this embodiment, the outer peripheral surface of the cylindrical main body portion 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, "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.

This allows the permeable membrane 11 to be fixed to the inner and outer cylinders 17 and 18, for example, by interposing the permeable membrane 11 between the inner and outer cylinders 17 and sliding the outer cylinder 18 onto the inner cylinder 17. Furthermore, when the permeable membrane 11 is fixed between the inner and outer cylinders 17 and 18, the permeable membrane 11 comes into contact with the chamfered portions 17d and 18b, thereby preventing damage to the permeable membrane 11.

As described above, in this embodiment, the ion electrode 5 is an ion electrode 5 that detects specific ions in a target liquid, and comprises 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 comprising an inner cylinder 17 having an opening 17a at its tip, 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 has a pressing portion 13e that is disposed within the inner cylinder 17 and presses the permeable membrane 11.

With this configuration, the permeable membrane 11 is fixed to the inner and outer cylinders 17 and 18 by being sandwiched between them. When the membrane component 12 is attached to the main body 13, the pushing portion 13e presses the permeable membrane 11, 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.

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

With this configuration, the permeable membrane 11 is sandwiched not only 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.

Furthermore, as in this embodiment, in the ion electrode 5, it is preferable that the outer cylinder 18 has a chamfered portion 18b on the inner peripheral edge of the base end.

With 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 prevents the permeable membrane 11 from being damaged.

Furthermore, as in this embodiment, in the ion electrode 5, it is preferable that the inner cylinder 17 has a chamfered portion 17d on the outer peripheral edge of the tip.

With 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 prevents the permeable membrane 11 from being damaged.

Furthermore, as in this embodiment, in the ion electrode 5, it is preferable that the pushing portion 13e has a chamfered portion 13f on the outer peripheral edge of the tip.

With 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. This prevents the permeable membrane 11 from being damaged.

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

(1) In the ion electrode 5 according to the above embodiment, the attachment mechanism 19 is configured as a screw mechanism consisting of a female thread 19a on the membrane component 12 and a male thread 19b on 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 components.

(2) Furthermore, 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 such a configuration. For example, the internal electrode 15 and the internal liquid 16 may be arranged outside the main body 13.

(3) Furthermore, 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 cylindrical.

(4) Furthermore, in the membrane component 12 according to the above embodiment, the permeable membrane 11 is configured to have 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 have the first clamped portion 11b but not the second clamped portion 11c.

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

(6) Furthermore, in the membrane component 12 according to the above embodiment, the first clamped portion 11b is configured to be clamped 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.

For example, as shown in Figure 8, the first clamped portion 11b may be sandwiched between the inner cylinder 17 and the outer cylinder 18 at an angle relative to the direction in which the pushing portion 13e pushes the permeable membrane 11. In other words, in a cross section along the direction in which the pushing portion 13e pushes the permeable membrane 11 (see Figure 8), the first clamped portion 11b may be arranged to extend at an angle relative to the direction in which the pushing portion 13e pushes the permeable membrane 11.

(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.

For example, as shown in Figure 8, the second clamped portion 11c may be sandwiched between the inner cylinder 17 and the outer cylinder 18 at an angle relative to the direction in which the pushing portion 13e pushes the permeable membrane 11. In other words, in a cross section along the direction in which the pushing portion 13e pushes the permeable membrane 11 (see Figure 8), the second clamped portion 11c may be arranged to extend in an angle relative to the direction in which the pushing portion 13e pushes the permeable membrane 11.

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, 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, 17d...chamfered portion, 18...outer cylinder, 18a...base end portion, 18b...chamfered portion, 19...mounting mechanism, 19a...female thread, 19b...male thread

Claims (7)

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 . 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. The ion electrode described in claim 2, wherein the outer cylinder has a chamfered portion on the inner peripheral edge of the base end. The ion electrode according to claim 1 , wherein the pushing portion has a chamfered portion on the outer circumferential edge of the tip. A water quality measuring device comprising the ion electrode according to any one of claims 1 to 4 . A membrane component used in the ion electrode according to any one of claims 1 to 4 . A method for producing the ion electrode according to any one of claims 1 to 4 , comprising:
and attaching the membrane component to the body so that the pushing portion pushes the permeable membrane.