Test components and detection probes
By designing a multi-layered test component in the electrode-based ammonia nitrogen probe, including a sheet-like conductive substrate and a threaded connector, the problems of insufficient support and inconvenient replacement of traditional probes are solved, thereby improving the sensitivity of the test and the ease of replacement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CORE VISION (BEIJING) TECH CO LTD
- Filing Date
- 2025-08-01
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional electrode-based ammonia nitrogen probes suffer from problems such as filling fluid leakage, bubble interference, easy damage to the test membrane, and inconvenient replacement, especially insufficient support of the test membrane and poor operability of replacement.
A multi-layer structure including a shell is designed, comprising a test membrane, a solid contact layer and a conductive substrate. The conductive substrate is sheet-like or block-like, and uses copper nanoparticles or silver nanoparticles as conductive layers. The connector is connected by threads, and the spring component enables electrical connection. The seal prevents liquid from entering, and the test membrane is removable and replaceable.
Effective support for the test membrane improves test sensitivity and accuracy, simplifies the replacement process, and reduces the risk of test abnormalities and damage.
Smart Images
Figure CN224500508U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a testing component and a detection probe. Background Technology
[0002] Most commercially available electrode-based ammonia nitrogen probes currently consist of a test membrane, a conductive filling solution, and a conductive component. This type of ammonia nitrogen probe suffers from the following four problems:
[0003] 1. Leakage of the filling fluid causes the test membrane and conductive parts to lose the conductive medium, resulting in test abnormalities;
[0004] 2. Air bubbles in the filling liquid adhere to the membrane or conductive metal wire, causing inaccurate testing. To avoid air bubble interference, the probe must be placed vertically during testing and cannot be placed horizontally or upside down. It must also be shaken before testing to drive the air bubbles to the top.
[0005] 3. The test membrane lacks effective support and is easily damaged under the impact of water flow;
[0006] 4. When replacing the membrane head after the test membrane is damaged, leakage and contamination of the filling fluid can easily occur.
[0007] To address a series of problems caused by the filling liquid used for contact conduction in traditional electrode-based ammonia nitrogen probes, Patent Document 1 proposes the following structure: an electrode coated with conductive polyaniline is rapidly dipped into a saturated solution of soluble polyaniline in N,N-dimethylformamide, inverted in a crucible containing sand, and dried in an oven at 80–150°C for 4–6 hours, thereby obtaining an electrode with a surface coated with soluble polyaniline.
[0008] Patent Document 1: Chinese Patent Publication No. CN103063725B Utility Model Content
[0009] In the aforementioned patent document 1, metal wire was used as the conductive part. As a result, the support for the test membrane was insufficient, leaving room for improvement. Furthermore, the ease of replacement of the membrane head after the test membrane is damaged was not investigated.
[0010] The purpose of this application is to provide a test assembly that can effectively support the test membrane and is easy to replace, as well as a detection probe containing the test assembly.
[0011] One technical solution of this application provides a test assembly, which includes a housing with openings at both ends. A multi-layer structure is disposed within the housing, extending from one end of the housing to the other end. The multi-layer structure sequentially includes: a test membrane constituting an ion-selective electrode; a solid contact layer that directly or indirectly contacts the test membrane to convert ions into electrons; and a conductive substrate electrically connected to the solid contact layer, and in the form of a sheet or block. The test membrane is exposed through an opening at one end of the housing, and a connector is detachably mounted at the other end of the housing, the connector being electrically connected to the conductive substrate.
[0012] Preferably, the test assembly further includes a copper nano-conductive layer or a silver nano-conductive layer located between the conductive substrate and the solid contact layer.
[0013] Preferably, the solid contact layer is configured as a structure in which graphene quantum dots are coated with polyaniline.
[0014] Preferably, the ion-selective electrode is any one of an ammonium ion-selective electrode, a potassium ion-selective electrode, a copper ion-selective electrode, and a nitrate ion-selective electrode, and / or the conductive substrate is a platinum electrode sheet or a titanium electrode sheet or a titanium electrode sheet with platinum plating on its surface.
[0015] Preferably, a seal is provided on the opposite side of the solid contact layer of the conductive substrate, which seals the housing and the multilayer structure.
[0016] Preferably, the connector is provided with a conductive spring, and the electrical connection is achieved by the spring contacting the conductive substrate.
[0017] Preferably, the spring element is a spring pin or a spring sheet.
[0018] Preferably, the connector is connected to the housing by a thread.
[0019] Preferably, one end of the housing has a flange that projects inward, which abuts against the test membrane to prevent the multilayer structure from dislodging from an opening at one end of the housing.
[0020] Another technical solution of this application provides a detection probe for measuring the ion concentration in a liquid, comprising: a wiring substrate; and a test component as described in any of the above claims, wherein the conductive substrate of the test component is electrically connected to the wiring substrate.
[0021] Effects of the utility model
[0022] Based on this invention, a test assembly that can effectively support the test membrane and is easy to replace, as well as a detection probe containing the test assembly, can be provided. Attached Figure Description
[0023] Figure 1 This is an overall schematic diagram of the test component of one embodiment of the present invention.
[0024] Figure 2 This is an exploded view of the test component of one embodiment of the present invention.
[0025] Figure 3 This is a graph showing the relationship between the open-circuit voltage of embodiments of the present invention and ammonium chloride standard solutions of different concentrations.
[0026] Explanation of reference numerals in the attached figures
[0027] 100. Test assembly; 10. Connector; 11. Spring; 1. Housing; 2. Test membrane; 3. Solid contact layer; 4. Conductive layer; 5. Conductive substrate; 6. Seal; h. External thread; H. Internal thread; F. Flange. Detailed Implementation
[0028] The following description is based on the accompanying drawings and describes embodiments of the present invention, but the present invention is not limited to the structure of the embodiments.
[0029] <Structure of the test component>
[0030] Figure 1 This is a schematic diagram showing the overall structure of test component 100. Figure 2 This is an exploded view showing the structure of test component 100, as shown below. Figure 2 As shown, the test component 100 is assembled by attaching the housing 1 to the connector 10.
[0031] like Figure 2 As shown, the test assembly 100 has a housing 1, which is a shell with openings at both ends. Figure 2 The diagram shows openings at both the top and bottom, but it is not limited to this. The interior of the outer casing 1 has a multi-layered structure.
[0032] like Figure 2 As shown, in the direction from one end (e.g., the lower end) of the outer casing 1 toward the other end (e.g., the upper end) of the outer casing 1, the multilayer structure sequentially includes: a test membrane 2, which constitutes an ion-selective electrode; a solid contact layer 3, which contacts the test membrane 2 and is used to convert ions into electrons; and a conductive substrate 5, which contacts the solid contact layer 3 and is in the form of a sheet or block.
[0033] The conductive substrate 5 being sheet-like or block-like means that it is not linear or a thin rod, but rather a sheet with a certain area, or a block with a certain area and thickness. As long as it effectively supports the test film 2, the specific shape of the conductive substrate 5 is not limited; it can be rectangular, circular, or other irregular shapes. For those skilled in the art, compared to linear or thin rod shapes, as long as the technical concept of effectively supporting a multilayer structure is understood, there are no particular restrictions on the specific sheet-like or block-like shape chosen.
[0034] Furthermore, it should be noted that the multilayer structure, comprising the test film 2, the solid contact layer 3, and the conductive substrate 5, refers to the arrangement of these three components in the direction from one end of the outer casing 1 to the other. It is not strictly required that the solid contact layer 3 be stacked on the test film 2; for example, other layers can be provided between the test film 2 and the solid contact layer 3. That is, the solid contact layer 3 can be in direct contact with the test film 2 or indirect contact with it.
[0035] like Figure 2 As shown, the test membrane 2 is exposed from the lower opening of the outer casing 1, thereby allowing the test membrane 2 to come into contact with the liquid phase and thus test specific ions in the liquid.
[0036] Furthermore, a conductive layer 4 may be present between the conductive substrate 5 and the solid contact layer 3. The conductive layer 4 may be, for example, a copper nanoparticle conductive layer or a silver nanoparticle conductive layer. The conductive layer 4 may be formed directly on the conductive substrate 5, that is, copper nanoparticles or silver nanoparticles may be uniformly covered on the surface of the conductive substrate 5 facing the solid contact layer 3 to form the conductive layer 4. This can further improve conductivity and, together with the sheet-like or block-like conductive substrate 5, further effectively support the test film 2.
[0037] The ion-selective electrode is any one of an ammonium ion-selective electrode, a potassium ion-selective electrode, a copper ion-selective electrode, or a nitrate ion-selective electrode, and / or the conductive substrate 5 is a platinum electrode sheet, a titanium electrode sheet, or a titanium electrode sheet with platinum plated on its surface. Corresponding to the ion-selective electrode, the test membrane 2 is, for example, an ammonium ion-selective membrane, a potassium ion-selective membrane, a copper ion-selective membrane, or a nitrate ion-selective membrane.
[0038] Similarly, Figure 2 As shown, a sealant 6 is provided on the opposite side (upper side) of the solid contact layer 3 of the conductive substrate 5 (lower side). The sealant 6 seals the housing 1 and the multilayer structure, so that even if the test assembly 100 is immersed in liquid, the liquid will not seep into the space between the multilayer structure and the connector 10. The sealant 6 is made of, for example, potting compound.
[0039] In one example, the seal 6 may form a ring around the circumference of the housing 1, specifically covering the seam between the housing 1 and the conductive substrate 5 located near the inner wall of the housing 1.
[0040] A connecting seat 10 is connected to the other end (upper end) of the outer casing 1. A conductive spring member 11 is supported on the connecting seat 10. The spring member 11 contacts the conductive base 5 to achieve electrical connection. The spring member 11 can be a spring pin or a spring sheet. The connecting seat 10 and the outer casing 1 are connected in a detachable manner, for example, by a threaded connection. In this embodiment, as... Figure 2 As shown, the connecting seat 10 is provided with an external thread h, and the inner wall surface of the outer shell 1 is provided with an internal thread H. Alternatively, the outer wall surface of the outer shell 1 can be provided with an external thread, and the connecting seat 10 can be provided with a hole for the outer shell 2 to enter, with an internal thread in the hole.
[0041] Furthermore, the connection method is not limited to threads; a protrusion can be provided on one of the connecting seat 10 and the housing 1, and a recess on the other, thereby achieving the connection between the connecting seat 10 and the housing 1 by embedding the protrusion into the recess. Additionally, as... Figure 2 As shown, a flange F protruding inwards is present at one end (lower end) of the housing 1. This flange F abuts against the test membrane 2 to prevent the multilayer structure from dislodging from the opening at one end of the housing 1. In this embodiment, the multilayer structure is positioned by being held between the seal 6 and the flange F.
[0042] A wiring is also connected to the spring member 11, through which the spring member 11 is electrically connected to the wiring substrate of the detection probe. Thus, the test assembly 100 can transmit electrical signals to the wiring substrate.
[0043] The test assembly 100 of this application has a structure in which a multi-layer structure is provided in a housing 1 that is open at both ends. As described above, the multi-layer structure includes, from one end of the housing 1 to the other end, a test film 2, a solid contact layer 3, and a conductive substrate 5. When manufacturing the multi-layer structure, it is constructed in the order of conductive substrate 5, solid contact layer 3, and test film 2.
[0044] <Effect>
[0045] In this embodiment, by making the conductive substrate 5 into a sheet or block shape, compared to a linear or rod-shaped structure, it is possible to effectively support the test membrane 2. Furthermore, by using a sheet or block-shaped conductive substrate 5, the contact area with the solid contact layer can be increased, thereby improving sensitivity. Effective support of the test membrane 2 also makes it less prone to deformation or damage.
[0046] Furthermore, a multi-layer structure is provided within the outer casing 1, which has openings at both ends, and the outer casing 1 has an opening at one end ( Figure 2The upper opening of the housing is provided with a connector 10, so that when the test component needs to be replaced, it can be easily replaced by removing the housing 1 from the connector 10.
[0047] Based on this, the housing 1 and the connector 10 are designed to be easily detachable, allowing for further easy replacement. Furthermore, by using a spring 11 as the component for electrically connecting the connector 10 and the conductive substrate 5, the ease of replacement is further improved compared to the traditional electrical connection method of soldering wiring.
[0048] In this embodiment, by forming the conductive layer 4, the microscopic contact area between the conductive substrate 5 and the solid contact layer 3 can be enhanced. This not only improves conductivity but also facilitates effective support for the test film 2.
[0049] Furthermore, the testing performance can be improved by introducing graphene quantum dots into the solid contact layer.
[0050] The test component provided in this application was tested. Before testing, the test component was activated by immersing it in a 0.01M ammonium chloride solution for 6–12 hours. After activation, the relationship between the open-circuit voltage between the test component prepared in the test example and the reference electrode (Ag / AgCl electrode) and different concentrations of ammonium chloride standard solutions was analyzed, as follows: Figure 3 As shown, the test results conform to the Nernst equation, with a linear range of 0.18–180 mg / L, a detection limit of 0.18 mg / L, and a sensitivity of 52.28 mV / decade (decade: order of magnitude). R 2 The value is 0.9992 (R squared represents linearity; the closer it is to 1, the higher the linearity within the detection range, and the higher the accuracy will be).
[0051] <Other>
[0052] The testing component of this invention can be applied to a detection probe that measures the ion concentration in a liquid, such as ammonia nitrogen concentration or nitrate nitrogen concentration. The probe can be configured with appropriate electrodes according to the requirements of the testing parameters. The detection probe includes: a wiring substrate; and a testing component. The connector 10 (conductive substrate 5) of the testing component is electrically connected to the wiring substrate to transmit signals. Optionally, the detection probe also includes a temperature sensor, which is electrically connected to the wiring substrate.
Claims
1. A test component, characterized in that, The test assembly includes a housing with openings at both ends, and a multi-layer structure is disposed within the housing. From one end of the housing to the other end, the multi-layer structure sequentially includes: The test membrane constitutes an ion-selective electrode. A solid contact layer, which is in direct or indirect contact with the test membrane, is used to convert ions into electrons; and A conductive substrate, electrically connected to the solid contact layer, and in the form of a sheet or block. The test membrane is exposed through an opening at one end of the housing, and a connector is detachably mounted at the other end of the housing, which is electrically connected to the conductive substrate.
2. The test component according to claim 1, characterized in that, The test assembly also includes a copper nano-conductive layer or a silver nano-conductive layer located between the conductive substrate and the solid contact layer.
3. The test component according to claim 1, characterized in that, The solid contact layer is composed of graphene quantum dots coated with polyaniline.
4. The test component according to claim 1, characterized in that, The ion-selective electrode is any one of an ammonium ion-selective electrode, a potassium ion-selective electrode, a copper ion-selective electrode, and a nitrate ion-selective electrode, and / or, The conductive substrate is a platinum electrode sheet, a titanium electrode sheet, or a titanium electrode sheet with platinum plating on its surface.
5. The test component according to claim 1, characterized in that, A seal is provided on the opposite side of the solid contact layer of the conductive substrate, which seals the housing and the multilayer structure.
6. The test component according to claim 1, characterized in that, The connector is equipped with a conductive spring, and electrical connection is achieved by the spring contacting the conductive substrate.
7. The test component according to claim 6, characterized in that, The spring component is a spring pin or a spring sheet.
8. The test component according to claim 1, characterized in that, The connector is connected to the housing by a thread.
9. The test component according to any one of claims 1 to 8, characterized in that, One end of the housing has a flange that protrudes inward and abuts against the test membrane to prevent the multilayer structure from detaching from the opening at one end of the housing.
10. A detection probe for measuring the concentration of ions in a liquid, characterized in that, include: Wiring substrate; The test component according to any one of claims 1 to 9, wherein the conductive substrate of the test component is electrically connected to the wiring substrate.