Gas concentration sensor and gas detector

Abstract

The utility model discloses a gas concentration sensor and a gas detector, and relates to the field of gas detection instruments. The gas concentration sensor comprises a base body, a first electrode and a second electrode, the first electrode and the second electrode are arranged on the base body, each of the first electrode and the second electrode comprises a main electrode and at least two branch electrodes connected with the main electrode, each branch electrode is of a planar spiral structure, and the branch electrodes of the first electrode and the branch electrodes of the second electrode are in one-to-one correspondence. And the two corresponding branch electrodes in the first electrode and the second electrode are mutually nested. The gas detector comprises a shell and a sensor. Compared with the prior art, the device disclosed by the utility model has the advantages of better response stability, better reaction efficiency and better use reliability.

Description

Technical Field

[0001] This utility model relates to the field of gas detection instrument technology, and in particular to a gas concentration sensor and a gas detector. Background Technology

[0002] A gas detector is an instrument used to detect gas concentrations, primarily for monitoring the concentration of combustible gases, and plays a vital role in industrial production. The core component of a gas detector is the gas concentration sensor, and the lifespan of the gas concentration sensor determines the lifespan of the gas detector.

[0003] In gas detectors, most gas concentration sensors are electrochemical sensors. These sensors have electrodes for electrochemical reactions, but over time, the surface of the electrodes accumulates and is covered with electrochemical reaction products, reducing the effective reaction area and decreasing the electrode's lifespan and sensitivity. To achieve a longer lifespan and better sensitivity, the electrode needs to maximize its surface area within a limited space; therefore, interdigitated electrodes are often used.

[0004] Interdigitated electrodes have a comb-like structure, with two electrodes intersecting each other, which can achieve a larger electrochemical reaction area. For example, Chinese invention patent application CN117783219A discloses a sensor sensing module that uses interdigitated electrodes.

[0005] However, the electric field generated by the interdigitated electrode system is discontinuous, and its diffusion field edges are non-uniform, which affects the response stability of the sample. To solve this technical problem, existing technology provides a microelectrode system and electrochemical sensor with a double helix structure. The electrodes in this sensor are nested double helixes, which can provide a continuous electric field distribution and improve the stability of the response in electrochemical measurements.

[0006] However, the double-helix electrode also has its drawbacks. This type of electrode has no branching structure, and each electrode has a single and relatively long charge movement path. On the one hand, this will increase the resistance of the electrode and affect the efficiency of the electrochemical reaction. On the other hand, the slender electrode is also prone to breakage under stress, and after the breakage, all electrode parts after the break point will fail, which will have a significant impact on the reliability of the electrode. Utility Model Content

[0007] One of the objectives of this invention is to provide a gas concentration sensor to solve the technical problems of weak response stability of interdigitated electrodes and low electrochemical reaction efficiency and poor reliability of double helix electrodes in the prior art.

[0008] Another objective of this invention is to provide a gas detector to solve the aforementioned technical problems.

[0009] To solve the above-mentioned technical problems, the technical solution of the gas concentration sensor provided by this utility model is as follows:

[0010] A gas concentration sensor includes a substrate and a first electrode and a second electrode disposed on the substrate. The first electrode and the second electrode each include a main electrode and at least two branch electrodes connected to the main electrode. The branch electrodes are all in a planar spiral structure. The branch electrodes of the first electrode and the branch electrodes of the second electrode correspond one-to-one. The corresponding two branch electrodes of the first electrode and the second electrode are nested together.

[0011] The present invention is further configured such that the width of the main electrode is greater than the width of the branch electrode.

[0012] The present invention is further configured such that the width of the main electrode is 1.5-3 times the width of the branch electrode.

[0013] The present invention is further configured such that: the branch electrode includes at least two straight electrode segments of equal width connected in sequence, and the two adjacent straight electrode segments are perpendicular to each other.

[0014] The present invention is further configured such that a single branch electrode has an odd number of straight electrode segments.

[0015] The present invention is further configured such that the number of straight electrode segments in a single branch electrode is 3, 5, or 7.

[0016] The present invention is further configured such that the straight electrode segment in the branch electrode connected to the main electrode is perpendicular to the main electrode.

[0017] The present invention is further configured such that a rounded corner structure is provided between two adjacent straight electrode segments.

[0018] The present invention is further configured such that the number of branch electrodes in the first electrode and the second electrode ranges from 4 to 12.

[0019] The beneficial effects are as follows: In the gas concentration sensor provided by this utility model, by setting at least two branch electrodes for the first electrode and the second electrode, and making the responding branch electrodes in the first electrode and the second electrode planar spiral and nested, the advantages of interdigital electrodes and double helix electrodes are obtained. On the one hand, the response stability in electrochemical measurement is better than that of traditional interdigital electrodes. On the other hand, due to having at least two branch structures, the electrochemical reaction efficiency of the electrode is higher than that of double helix electrodes. Moreover, if one branch electrode breaks under stress, it will not affect the normal operation of the remaining branch electrodes. Therefore, the reliability of this electrode is also stronger than that of double helix electrodes.

[0020] To solve the above-mentioned technical problems, the technical solution of the gas detector provided by this utility model is as follows:

[0021] A gas detector includes a housing, a display screen, an audible and visual alarm light, and a sensor. The sensor includes a substrate and a first electrode and a second electrode disposed on the substrate. Both the first electrode and the second electrode include a main electrode and at least two branch electrodes connected to the main electrode. The branch electrodes are all in a planar spiral structure. The branch electrodes of the first electrode and the branch electrodes of the second electrode correspond one-to-one. The corresponding two branch electrodes of the first electrode and the second electrode are nested together.

[0022] The present invention is further configured such that the width of the main electrode is greater than the width of the branch electrode.

[0023] The present invention is further configured such that the width of the main electrode is 1.5-3 times the width of the branch electrode.

[0024] The present invention is further configured such that: the branch electrode includes at least two straight electrode segments of equal width connected in sequence, and the two adjacent straight electrode segments are perpendicular to each other.

[0025] The present invention is further configured such that a single branch electrode has an odd number of straight electrode segments.

[0026] The present invention is further configured such that the number of straight electrode segments in a single branch electrode is 3, 5, or 7.

[0027] The present invention is further configured such that the straight electrode segment in the branch electrode connected to the main electrode is perpendicular to the main electrode.

[0028] The present invention is further configured such that a rounded corner structure is provided between two adjacent straight electrode segments.

[0029] The present invention is further configured such that the number of branch electrodes in the first electrode and the second electrode ranges from 4 to 12.

[0030] The beneficial effects are as follows: In the gas concentration sensor of the gas detector provided by this utility model, by setting at least two branch electrodes for the first electrode and the second electrode, and making the responding branch electrodes in the first electrode and the second electrode planar spiral and nested, the advantages of interdigital electrodes and double helix electrodes are obtained. On the one hand, the response stability in electrochemical measurement is better than that of traditional interdigital electrodes. On the other hand, due to having at least two branch structures, the electrochemical reaction efficiency of the electrode is higher than that of double helix electrodes. Moreover, if one branch electrode breaks under stress, it will not affect the normal operation of the remaining branch electrodes. Therefore, the reliability of this electrode is also stronger than that of double helix electrodes. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the gas detector in this utility model;

[0032] Figure 2 This is a schematic diagram of the sensor electrode structure in Embodiment 1 of the gas detector of this utility model.

[0033] Reference numerals: 1. Housing; 2. Display screen; 3. Audible and visual alarm light; 4. Sensor; 41. Substrate; 42. First electrode; 421. First main electrode; 422. First branch electrode; 43. Second electrode; 431. Second main electrode; 432. Second branch electrode; 44. Straight electrode segment. Detailed Implementation

[0034] The present invention will now be described clearly and completely with reference to the embodiments.

[0035] Example 1 of the gas detector provided by this utility model:

[0036] See appendix Figure 1 A gas detector includes a housing 1, a display screen 2, an audible and visual alarm light 3, and a sensor 4.

[0037] See appendix Figure 2 The sensor 4 includes a substrate 41 and a first electrode 42 and a second electrode 43 disposed on the substrate 41. The first electrode 42 and the second electrode 43 each include a main electrode and four branch electrodes. The main electrode of the first electrode 42 is the first main electrode 421, and the branch electrode of the first electrode 42 is the first branch electrode 422. The main electrode of the second electrode 43 is the second main electrode 431, and the branch electrode of the second electrode 43 is the second branch electrode 432.

[0038] The first branch electrodes 422 are all connected to the same side of the first main electrode 421 and are evenly spaced along the length of the first main electrode 421. The first branch electrodes 422 have a planar spiral structure. The second branch electrodes 432 are also all connected to the same side of the second main electrode 431 and are evenly spaced along the length of the second main electrode 431. The second branch electrodes 432 also have a planar spiral structure.

[0039] The first main electrode 421 and the second main electrode 431 are parallel to each other. The first branch electrode 422 and the second branch electrode 432 are located between the first main electrode 421 and the second main electrode 431 and correspond to each other. The corresponding first branch electrode 422 and the second branch electrode 432 are nested together.

[0040] The first branch electrode 422 and the second branch electrode 432 each include three straight electrode segments 44 of equal width and unequal length connected in sequence. Adjacent straight electrode segments 44 are perpendicular to each other, and the straight electrode segment 44 connected to the corresponding main electrode is perpendicular to the corresponding main electrode. Furthermore, a rounded corner structure is provided between adjacent straight electrode segments 44 to reduce stress concentration at the connection point. In other embodiments, the rounded corner may not be provided, which will not be elaborated here.

[0041] To reduce the risk of breakage of the main electrode due to stress during use and to lower its resistance, the width of the main electrode is greater than the width of the branch electrode. Specifically, in this embodiment, the width of the main electrode is twice the width of the branch electrode. In other embodiments, the width of the main electrode can be 1.5-3 times the width of the branch electrode.

[0042] Since both the first electrode 42 and the second electrode 43 in the sensor 4 are provided with branch electrodes, the overall resistance of the electrodes is smaller than that of the double-helix electrode in the prior art, thus the electrochemical reaction efficiency is higher. Moreover, if one branch electrode breaks, it will not affect the normal operation of the remaining branch electrodes. Therefore, the reliability of the sensor 4 is also stronger than that of the double-helix electrode sensor 4 in the prior art. Furthermore, since the corresponding branch electrodes of the first electrode 42 and the second electrode 43 have a planar spiral and nested structure, the response stability in electrochemical measurement is better than that of the traditional interdigitated electrode.

[0043] In this embodiment, considering the balance of performance, the number of branch electrodes in the first electrode 42 and the second electrode 43 is selected to be four. In other embodiments, the number of branch electrodes can be selected from 4 to 12.

[0044] In this embodiment, three straight electrode segments 44 are provided in a single branch electrode to ensure a relatively long coupling length between the first branch electrode 422 and the corresponding second branch electrode 432. Furthermore, the number of straight electrode segments 44 in a single branch electrode is preferably an odd number, particularly 3, 5, or 7. Of course, in other embodiments, two or four straight electrode segments 44 may also be provided.

[0045] Embodiment 2 of the gas detector provided by this utility model:

[0046] This embodiment is based on Embodiment 1, and the only difference from Embodiment 1 is that the width of the main electrode and the width of the branch electrode are equal in this embodiment.

[0047] Embodiments of the gas concentration sensor provided by this utility model:

[0048] The gas concentration sensor is the sensor in specific embodiments 1, 2, or 3 of the gas detector described above, and will not be described in detail here.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape and principle of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A gas concentration sensor, comprising a substrate (41) and a first electrode (42) and a second electrode (43) disposed on the substrate (41), characterized in that, The first electrode (42) and the second electrode (43) both include a main electrode and at least two branch electrodes connected to the main electrode. The branch electrodes are all in a planar spiral structure. The branch electrodes of the first electrode (42) correspond one-to-one with the branch electrodes of the second electrode (43). The corresponding two branch electrodes in the first electrode (42) and the second electrode (43) are nested together.

2. The gas concentration sensor according to claim 1, characterized in that: The width of the main electrode is greater than the width of the branch electrode.

3. The gas concentration sensor according to claim 2, characterized in that: The width of the main electrode is 1.5-3 times the width of the branch electrode.

4. The gas concentration sensor according to any one of claims 1-3, characterized in that: The branch electrode includes at least two straight electrode segments (44) of equal width connected in sequence, with adjacent straight electrode segments (44) perpendicular to each other.

5. The gas concentration sensor according to claim 4, characterized in that: A single branch electrode has an odd number of straight electrode segments (44).

6. The gas concentration sensor according to claim 5, characterized in that: The number of straight electrode segments (44) in a single branch electrode is 3, 5, or 7.

7. The gas concentration sensor according to claim 4, characterized in that: The straight electrode segment (44) in the branch electrode that is connected to the main electrode is perpendicular to the main electrode.

8. The gas concentration sensor according to claim 4, characterized in that: A rounded corner structure is provided between two adjacent straight electrode segments (44).

9. The gas concentration sensor according to any one of claims 1-3, characterized in that: The number of branch electrodes in the first electrode (42) and the second electrode (43) ranges from 4 to 12.

10. A gas detector, comprising a housing (1), a display screen (2), an audible and visual alarm light, and a sensor, characterized in that, The sensor is the gas concentration sensor according to any one of claims 1-9.

Images