CN210221893U

CN210221893U - Electrochemical gas sensor

Info

Publication number: CN210221893U
Application number: CN201921135491.5U
Authority: CN
Inventors: Liqiang Chen; 陈立强; Ruoshui Liu; 刘若水; Shujin Zhang; 张树金
Original assignee: Zhengzhou Meike Shengshi Electronic Technology Co ltd
Current assignee: Zhengzhou Meike Shengshi Electronic Technology Co ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-03-31
Anticipated expiration: 2029-07-19

Abstract

The utility model provides an electrochemistry gas sensor, including casing, waterproof ventilated membrane, working electrode, diaphragm, counter electrode, liquid storage cotton and two at least lead wire contact pins, the casing top is provided with the opening, the opening part is provided with the upper cover, the inlet port has been seted up to the center department of upper cover, waterproof ventilated membrane sets up the upper cover top, the working electrode with the upper cover sets up just with the axle center the upper portion a week of working electrode sets up the upper cover bottom, the bottom of working electrode is provided with first diaphragm, and the counter electrode setting is in the bottom of first diaphragm adsorbs the liquid storage cotton setting that has the conducting liquid in the bottom of counter electrode, and the lead wire contact pin sets up the casing bottom, working electrode and counter electrode are respectively through electrode lead wire electric connection lead wire contact pin. The electrochemical gas sensor has the advantages of sufficient contact and edge diffusion avoidance.

Description

Electrochemical gas sensor

Technical Field

The utility model relates to an electrochemistry gas sensor.

Background

An Electrochemical gas sensor (Electrochemical gas sensor) is a detector that measures a current by oxidizing or reducing a gas to be measured at an electrode, and obtains a concentration of the gas to be measured. In the existing electrochemical gas sensor, an air inlet is usually arranged at the top of a shell, an electrode is arranged in the shell, and gas enters the shell from the air inlet and then reacts at a working electrode. But the gas entering the housing may affect other components.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the background technology, the utility model provides an electrochemical gas sensor.

The utility model provides an electrochemistry gas sensor, includes casing, waterproof ventilated membrane, working electrode, diaphragm, counter electrode, stock solution cotton and two at least lead wire contact pins, the casing top is provided with the opening, the opening part is provided with the upper cover, the inlet port has been seted up to the center department of upper cover, waterproof ventilated membrane sets up the upper cover top, working electrode with the upper cover sets up just with the axle center upper portion a week of working electrode sets up the upper cover bottom, working electrode's bottom is provided with first diaphragm, and the counter electrode setting is in the bottom of first diaphragm, the stock solution cotton setting that adsorbs to have conductive liquid is in the bottom of counter electrode, and the lead wire contact pin sets up casing bottom, working electrode and counter electrode are respectively through electrode lead wire electric connection lead wire contact pin.

Based on the above, the working electrode is a PTFE membrane coated with a catalyst and a binder.

Based on the above, be provided with the cavity in the upper cover, the inlet port intercommunication the top of cavity, the opening of intercommunication the cavity bottom is seted up to the bottom of upper cover, be provided with filtration membrane in the cavity.

Based on the above, the number of the lead pins is three, the second diaphragm is arranged between the first diaphragm and the counter electrode, the reference electrode is arranged between the first diaphragm and the second diaphragm, and the reference electrode is electrically connected with the third lead pin through the motor lead.

Based on the above, the liquid storage cotton is of a roll type structure.

The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model discloses set up working electrode in the upper cover bottom, when gaseous getting into the casing by the inlet port, can only get into the casing through working electrode, effectively avoid the gaseous casing of advancing by working electrode edge diffusion that awaits measuring, make the gaseous only and the working electrode fully contact that awaits measuring.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of two lead pins according to the present invention.

Fig. 2 is a schematic structural diagram of three lead pins of the present invention.

Fig. 3 is a schematic structural diagram of the present invention with a filtering membrane.

In the figure: 1. a housing; 2. a waterproof breathable film; 3. an air inlet; 4. a working electrode; 5. a first diaphragm; 6. a counter electrode; 7. liquid storage cotton; 8. an electrode lead; 9. a lead pin is inserted; 10. a reference electrode; 11. a second diaphragm; 12. a cavity; 13. and (4) filtering the membrane.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1, fig. 2 and fig. 3, an electrochemical gas sensor comprises a shell 1, a waterproof air-permeable membrane 2, a working electrode 4, a diaphragm, a counter electrode 6, a liquid storage cotton 7 and at least two lead pins 9, the top of the shell 1 is provided with an opening, the opening is provided with an upper cover, the center of the upper cover is provided with an air inlet 3, the waterproof breathable film 2 is arranged at the top of the upper cover, the working electrode 4 and the upper cover are coaxially arranged, the upper part of the working electrode 4 is arranged at the bottom of the upper cover in a circle, the bottom of the working electrode 4 is provided with a first diaphragm 5, counter electrode 6 sets up the bottom of first diaphragm 5, and the stock solution cotton 7 that adsorbs to have the conducting liquid sets up in the bottom of counter electrode 6, and lead wire contact pin 9 sets up 1 bottom of casing, working electrode 4 and counter electrode 6 are respectively through electrode lead 8 electric connection lead wire contact pin 9.

When the gas to be measured diffuses into the shell 1 from the gas inlet 3, the gas to be measured can only enter the shell 1 through the working electrode 4 because the working electrode 4 is arranged at the bottom of the upper cover, so that the gas to be measured is in full contact with the working electrode 4. The waterproof breathable film 2 is used for preventing external liquid from entering the shell 1, and the waterproof breathable film 2 is a PTFE film in the embodiment. The counter electrode 6 is in direct contact with the liquid storage cotton 7, so that the transmission of electrolyte is facilitated. First diaphragm 5 plays two effects, and first for isolated two electrodes, the second has the imbibition function, can be with the liquid uptake in the stock solution cotton 7, makes the diaphragm have isolation and electrically conductive effect. In this embodiment, the working electrode 4 is a PTFE membrane coated with a catalyst and a binder. In this embodiment, the liquid storage cotton 7 is of a roll structure, so that the electrolyte can be conveniently transmitted in the vertical direction.

For a sensor selective to gas, such as a carbon monoxide sensor, a sulfur dioxide sensor and the like, a cavity 12 is arranged in the upper cover, the air inlet 3 is communicated with the top of the cavity 12, an opening communicated with the bottom of the cavity 12 is formed in the bottom of the upper cover, and a filtering membrane 13 is arranged in the cavity 12. The filtering membrane 13 filters the gas to facilitate the target gas to enter the housing 1. In practice, different filtering materials are arranged in the filtering membrane aiming at different target gases, when the target gas is carbon monoxide, the filtering material is carbon fiber, and when the target gas is sulfur dioxide, the filtering material is silver sulfate.

For a sensor with three lead pins 9, a second diaphragm 11 is arranged between the first diaphragm 5 and the counter electrode 6, a reference electrode 10 is arranged between the first diaphragm 5 and the second diaphragm 11, and the reference electrode 10 is electrically connected with the third lead pin 9 through a motor lead. A three pin 9 sensor, typically one reference electrode 10 more than a two pin 9 sensor, is separated from each other by a membrane.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An electrochemical gas sensor, characterized by: including casing, waterproof ventilated membrane, working electrode, diaphragm, counter electrode, liquid storage cotton and two at least lead wire contact pins, the casing top is provided with the opening, the opening part is provided with the upper cover, the inlet port has been seted up to the center department of upper cover, waterproof ventilated membrane sets up the upper cover top, working electrode with the upper cover sets up just with the axle center upper portion a week of working electrode sets up the upper cover bottom, working electrode's bottom are provided with first diaphragm, and the counter electrode setting is in the stock solution cotton setting that has conductive liquid is in the bottom of counter electrode to the bottom of first diaphragm, lead wire contact pin setting is in the casing bottom, working electrode and counter electrode are respectively through electrode lead wire electric connection lead wire contact pin.

2. The electrochemical gas sensor according to claim 1, wherein: the working electrode is a PTFE membrane coated with a catalyst and a binder.

3. The electrochemical gas sensor according to claim 1, wherein: the air inlet is communicated with the top of the cavity, an opening communicated with the bottom of the cavity is formed in the bottom of the upper cover, and a filtering membrane is arranged in the cavity.

4. The electrochemical gas sensor according to claim 1, wherein: the number of the lead pins is three, a second diaphragm is arranged between the first diaphragm and the counter electrode, a reference electrode is arranged between the first diaphragm and the second diaphragm, and the reference electrode is electrically connected with the third lead pin through a motor lead.

5. The electrochemical gas sensor according to claim 1, wherein: the liquid storage cotton is of a roll-type structure.