Ion selective electrode structure

Abstract

The utility model provides an ion selective electrode structure, which comprises a shell, a plurality of holes are arranged at one end of the shell, the outer surface of one end of the shell is communicated with the inner surface of one end of the shell through the plurality of holes, and the diameter of each hole is 0.1 mm-0. 8mm; and the ion-selective membrane is cured and formed at one end, provided with the multiple holes, of the shell, and the ion-selective membrane covers and is embedded into the multiple holes so as to be exposed to the outer side of the ion-selective electrode structure through the holes. According to the utility model, liquid leakage can be reliably prevented, and the sealing effect is better.

Description

Technical Field

[0001] This utility model relates to a test electrode, specifically, to an ion-selective electrode structure. Background Technology

[0002] In existing technologies, ion-selective electrode structures typically employ a split structure to fix a pre-formed ion-selective membrane. Gaskets or O-rings are used to seal the structural components and the ion-selective membrane. A liquid transport layer (electrolyte) is provided on the ion-selective membrane. To prevent electrolyte leakage, the ion-selective electrode structure process of this technology is relatively complex, and the risk of electrolyte leakage is high.

[0003] The existing approach to fabricating split-type ion-selective electrode structures involves first preparing an ion-selective membrane using a solution containing the corresponding ion carrier via spin coating or blade coating, then cutting the ion-selective membrane into appropriately sized circular pieces, and finally fixing and sealing them with two structural components to form the ion-selective electrode structure.

[0004] In existing technologies, such as Figure 5 , Figure 6 As shown, the following structure exists: a housing 100 with through holes is prepared, an ammonium-sensitive membrane 200 is placed inside the housing 100 with the through holes exposed, and then a fastener 300 is used to clamp and fix the ammonium-sensitive membrane 200 between the housing 100 and the fastener 300. The overall process flow of this scheme is relatively complex, and there is a risk of leakage between the ion-selective membrane and the structural components.

[0005] In addition, there is a patent document 1 that describes fixing the ion-selective membrane to the outer tube and then using an immobilized enzyme membrane to press the ion-selective membrane between the immobilized oxygen membrane and the outer tube, utilizing the elasticity of the ion-selective membrane to achieve long-term sealing. However, in this structure, the outer tube and the ion-selective membrane are still formed separately, and the risk of leakage still exists.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: US Patent Publication No. US4579642A Utility Model Content

[0009] Problems to be solved by utility models

[0010] The purpose of this invention is to provide an ion-selective electrode structure that can reliably prevent leakage and has a better sealing effect.

[0011] Solution for solving the problem

[0012] One technical solution of this utility model provides an ion-selective electrode structure, comprising: a shell having an internal receiving space, a plurality of holes being provided at one end of the shell, through which the outer surface of one end of the shell communicates with the inner surface of one end of the shell, each hole having a diameter of 0.1 mm to 0.8 mm; and an ion-selective membrane formed on the end of the shell having the plurality of holes, the ion-selective membrane covering and embedded in the plurality of holes, so as to be exposed to the outside of the ion-selective electrode structure through the holes.

[0013] Preferably, the ion-selective membrane includes a continuous layer structure located on the accommodating space side of the pores and a plurality of discrete protrusion structures filling the plurality of pores, wherein the protrusion structures and the continuous layer structure are integrally formed.

[0014] Preferably, an inwardly protruding portion is formed on the inner peripheral wall of the outer casing, the protruding portion having an inner peripheral surface, which divides the inner surface.

[0015] Preferably, the outer periphery of the ion-selective membrane is connected to the inner peripheral surface.

[0016] Preferably, the outer surface of the protruding structure is flush with the outer surface of the end of the outer shell where the hole is located.

[0017] Preferably, the diameter of the plurality of pores is 0.3 mm to 0.5 mm, and / or the ion-selective membrane is an ammonium ion-selective membrane or a nitrate ion-selective membrane.

[0018] Preferably, the shortest distance between the outer surface and the inner surface is 0.1 mm to 1 mm.

[0019] Preferably, the shortest distance between the outer surface and the inner surface is 0.2 mm to 0.5 mm.

[0020] Preferably, the furthest distance between the two furthest holes among the plurality of holes is 4mm to 9mm.

[0021] Preferably, the furthest distance between the two furthest holes among the plurality of holes is 6mm to 8mm.

[0022] Effects of the utility model

[0023] Based on the above-described structure of this utility model, an ion-selective electrode structure can be provided that can reliably prevent leakage and has a better sealing effect. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of the outer shell before the ion-selective membrane is formed.

[0025] Figure 2 This is a top view of the outer shell before the ion-selective membrane is formed.

[0026] Figure 3 This is a cross-sectional schematic diagram of an ion-selective membrane integrally formed inside the outer shell.

[0027] Figure 4 This is a top view schematic diagram of an ion-selective membrane integrally formed inside the outer shell.

[0028] Figure 5 This is a cross-sectional schematic diagram of the existing ion-selective electrode structure.

[0029] Figure 6 This is a top view schematic diagram of the existing ion-selective electrode structure.

[0030] Explanation of reference numerals in the attached figures

[0031] 10. Outer shell; 11. Protrusion; 12. Outer surface; 13. Hole; 14. Ion-selective membrane housing; 15. Inner circumferential surface; 16. Inner surface; 20. Ion-selective membrane; 21. Continuous layer structure; 22. Protrusion structure; 30. Reception space. Detailed Implementation

[0032] The following is a detailed description of the structure of this utility model based on the accompanying drawings. However, the following description is not intended to limit this utility model. Changes, substitutions, combinations, deletions, etc., can be made to the constituent elements of the technical solution without departing from the spirit of this application.

[0033] Figure 1 This is a schematic diagram of the outer shell before the formation of the ion-selective membrane in the ion-selective electrode structure of this application. Figure 1 As shown, the ion-selective electrode structure includes a housing 10, which is, for example, cylindrical, and has a receiving space 30 inside the housing 10. Figure 1 In this design, the upper end of the outer casing 10 can be considered as the detection end, i.e., the end in contact with the liquid. The lower end of the outer casing 10 can be mounted on a detection device (not shown). A wiring substrate and a temperature sensor are installed in the detection device. The wiring substrate can be electrically connected to the ion-selective electrode structure of this application to transmit signals. The accommodating space 30 of the outer casing 10 contains a filling liquid (not shown) and a conductive portion, thereby achieving the electrical connection between the ion-selective electrode structure of this application and the wiring substrate.

[0034] The outer surface 12 of one end of the outer casing 10 (the upper end in the figure) is the outer surface that comes into contact with the liquid to be tested, such as... Figure 1 , Figure 2As shown, a plurality of holes 13 are provided at one end of the outer casing 10, through which the outer surface 12 of one end of the outer casing 10 communicates with the inner surface 16 of one end of the outer casing 10. The diameter of each hole 13 is 0.1 mm to 0.8 mm, for example: 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, etc. More preferably, it is 0.3 mm to 0.5 mm.

[0035] The receiving space 30, which serves as a container for the filling liquid and the conductive parts, can be formed cylindrically inside the outer casing 10. That is, the cross-section of the receiving space 30 is circular, and the size of the cross-sectional area is consistent in the vertical direction. Alternatively, it can be, as... Figure 1 As shown, the inner peripheral wall of the side of the outer casing 10 has a protrusion 11 protruding inward at a position near one end (the upper end). The protrusion 11 can be formed over the entire circumference, or it can be formed at regular angles along the circumference. Figure 1 In the middle, the space enclosed by the inner peripheral surface 15 of the protrusion 11 serves as the ion-selective membrane receiving portion 14, which is part of the receiving space 30. The inner peripheral surface 15 of the protrusion 11 divides into an inner surface 16. In other words, the surface located on the side of the inner peripheral surface 15 that is closer to the outer surface 12 and inside the outer shell 10 is the inner surface 16.

[0036] like Figure 1 As shown, through a hole 13 formed at one end of the outer casing 10, the outside of the outer casing 10 can be connected to the ion-selective membrane housing 14 via the hole 13. Figure 2 As shown, even without the formation of the ion-selective membrane 20, it can be connected to the interior of the housing 10 via the hole 13.

[0037] The ion-selective electrode structure of this application also includes an ion-selective membrane 20, which is an ammonium ion-selective membrane or a nitrate ion-selective membrane. The ion-selective membrane 20 is formed on one end of the housing 10, which is provided with a plurality of holes 13, so that it is exposed to the outside of the ion-selective electrode structure through the holes 13. The ion-selective membrane 20 is formed on the housing 10, that is, the ion-selective membrane 20 is formed in situ on the housing 10, for example, it can be cured onto the housing 10 without the need for additional fixing structures. Preferably, the outer periphery of the ion-selective membrane 20 is connected to the inner peripheral wall of the housing 10. When a protrusion 11 is formed, it is preferable that the outer periphery of the ion-selective membrane 20 is connected to the inner peripheral surface 15 of the protrusion 11 throughout the entire circumference. When the protrusion 11 is formed over the entire circumference, the outer periphery of the ion-selective membrane 20 is also preferably connected to the inner peripheral surface 15 of the protrusion 11 over the entire circumference. When the protrusions 11 are formed at certain angles in the circumferential direction, the outer periphery of the ion selective membrane 20 is preferably alternately connected to the inner peripheral wall of the outer shell 10 and the inner peripheral surface 15 of the protrusions 11 in the circumferential direction.

[0038] Therefore, the ion-selective membrane 20 is not only solidified on the inner surface 16, but its outer periphery is also connected to the inner peripheral wall of the outer shell 10 and / or the inner peripheral surface 15 of the protrusion 11, which can further improve the sealing performance of the ion-selective membrane 20 and more reliably prevent leakage.

[0039] As described above, the ion-selective membrane 20 is cured and formed on the inner surface 16 of one end of the housing 10, and the outer periphery of the ion-selective membrane 20 is connected to the inner peripheral wall of the housing 10 and / or the inner peripheral surface 15 of the protrusion 11. Further, as... Figure 3 As shown, the ion-selective membrane 20 covers and embeds a plurality of pores 13. That is, the ion-selective membrane 20 includes a continuous layer structure 21 located on the receiving space 30 side of the pores 13 and a plurality of discrete protrusion structures 22 extending into (or filling) the plurality of pores 13. The protrusion structures 22 and the continuous layer structure 21 are integrally formed. Figure 4 As shown, the protrusion structure 22 can contact the ion-selective membrane 20 through the hole 13.

[0040] When the ion-selective membrane 20 is embedded in the hole 13, it is more conducive to the contact between the ion-selective membrane 20 and the liquid to be detected, and the ion-selective membrane 20 embedded in the hole 13 can further suppress the liquid from entering the interior of the housing 10 through the hole 13. Furthermore, the ion-selective membrane 20 can be embedded in all of the hole 13, or only partially. The degree to which the ion-selective membrane 20 is embedded in the hole 13 can be either that the ion-selective membrane 20 occupies a portion of the hole 13, i.e., the protrusion structure 22 does not occupy the entire space of the hole 13 and is not flush with the outer surface 12, or that the ion-selective membrane 20 occupies the entire portion of the hole 13, i.e., the protrusion structure 22 occupies the entire space of the hole 13, and the outer surface of the protrusion structure 22 is flush with the outer surface 12 of the end of the housing 10 where the hole 13 is located. In this case, it can also be said that the ion-selective membrane 20 fills the hole 13.

[0041] The thickness (depth) of the hole 13 is 0.1mm to 1mm, for example: 0.2mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, etc. Preferably, it is 0.2mm to 0.5mm. Here, the thickness of the hole 13 can be understood as the shortest distance between the outer surface 12 and the inner surface 16.

[0042] The diameter of the hole region formed by the plurality of holes 13 is 4mm to 9mm, for example, 4mm, 5mm, 6mm, 6.5mm, 7mm, 8mm, etc. Preferably, it is 6mm to 8mm. Here, the diameter of the hole region can be understood as the farthest distance between the two farthest holes among the plurality of holes 13, that is, not the distance between the centers of the two farthest holes, but the distance between the edges of the two farthest holes.

[0043] The method for forming the ion-selective membrane 20 is not particularly limited as long as it can be solidified into the housing 10. For example, a prepared solution containing the ion-selective carrier can be dripped from the inside of the housing 10 onto the pore area, with a solution volume of 30-100 μL, more preferably 50-80 μL. The solution is then placed in an oven at 60°C for 12 hours to dry. This allows for the formation of an integrated ion-selective electrode structure, i.e., a structure in which the ion-selective membrane 20 is solidified into the housing 10 without relying on a fixing component to hold it.

[0044] The integrated structure of this application not only simplifies the process and the structure itself, but also achieves better sealing performance.

Claims

1. An ion-selective electrode structure, characterized by comprises: a housing having an accommodation space inside, a plurality of holes being provided at one end of the housing, via which holes an outer surface of the one end of the housing communicates with an inner surface of the one end of the housing, each of the holes having a diameter of 0.1 mm to 0.8 mm; and an ion-selective membrane formed at the one end of the housing where the plurality of holes are provided, and covering and embedding the plurality of holes to be exposed to an outside of an ion-selective electrode structure via the holes.

2. The ion-selective electrode structure according to claim 1, wherein the ion-selective membrane includes a continuous layer structure on a side of the accommodation space of the holes and a plurality of discrete protruding structures filling the plurality of holes, the protruding structures and the continuous layer structure being integrally formed.

3. The ion-selective electrode structure according to claim 1, wherein a protruding portion protruding inward is formed on an inner peripheral wall of the housing, the protruding portion has an inner peripheral surface with which the inner surface is divided.

4. The ion-selective electrode structure according to claim 3, wherein an outer periphery of the ion-selective membrane is connected to the inner peripheral surface.

5. The ion-selective electrode structure according to claim 2, wherein an outer surface of the protruding structures is flush with an outer surface of the one end of the housing where the holes are provided.

6. The ion-selective electrode structure according to claim 1, wherein the plurality of holes have a diameter of 0.3 mm to 0.5 mm, and / or the ion-selective membrane is an ammonium ion-selective membrane or a nitrate ion-selective membrane.

7. The ion-selective electrode structure according to claim 1, wherein a shortest distance between the outer surface and the inner surface is 0.1 mm to 1 mm.

8. The ion-selective electrode structure according to claim 7, wherein the shortest distance between the outer surface and the inner surface is 0.2 mm to 0.5 mm.

9. The ion-selective electrode structure according to any one of claims 1 to 8, wherein a longest distance between two holes farthest apart among the plurality of holes is 4 mm to 9 mm.

10. The ion-selective electrode structure according to claim 9, wherein the longest distance between the two holes farthest apart among the plurality of holes is 6 mm to 8 mm. ​

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