CN216696147U - Electrochemical gas sensor with inlet and outlet interface - Google Patents

Abstract

The utility model discloses an electrochemical gas sensor with an inlet and outlet interface, wherein an upper housing is arranged on a shell, a liquid storage tank is arranged in the shell, a working electrode, a reference electrode and a counter electrode are arranged on the upper part of the liquid storage tank, and glass fiber paper absorbing electrolyte is arranged between the electrodes for separation to form ion conduction. A sealing ring is arranged between an opening at the upper part of the shell and the working electrode, a filter can be selectively installed above the working electrode, two side edges of the upper cover shell are respectively communicated with a gas inlet pipe and a gas outlet pipe, and the bottom of the shell is respectively provided with a first pin, a second pin and a third pin which are respectively connected with the working electrode, the reference electrode and the counter electrode. The utility model has the beneficial effects that: the upper part of the working electrode of the sensor is completely opened, gas flows in a turbulent flow state when entering the sensor, and the gas can directly and quickly contact with the working electrode, so that the gas detection response speed is improved; compact structure, small volume, fast response, low cost and more reliability.

Description

Electrochemical gas sensor with inlet and outlet interface

Technical Field

The utility model relates to the technical field of gas detectors, in particular to an electrochemical gas sensor with an inlet and outlet interface.

Background

In the field of gas detection, some gas detectors need to be used, pump-suction detectors are often designed into portable instruments for detecting the concentration of toxic gases in narrow spaces such as pipelines, deep wells, chimneys and the like, and in addition, the pump-suction detectors are also used for detecting exhaled breath; the gas detector needs to adopt a gas sensor, and the gas sensor in the current pump-suction type gas detector can be added with a structure of a gas-moving cap to realize gas sampling and detection.

As shown in fig. 1, which is a structure diagram of a gas sensor in the prior art, the structure diagram includes a gas-supplying cap 18, a housing 1, an upper cover 2, a dustproof film 20, a diffusion hole 19, a filter 3, a sealing ring 9, a hydrophobic film 4, a working electrode 5, a reference electrode 6 and an electric plate 7, wherein the upper cover 2 is installed on the housing 1, the reservoir 8 is installed in the housing 1, the working electrode 5 is installed on the upper portion of the reservoir 8, the hydrophobic film 4 is installed on the upper portion of the working electrode 5, the sealing ring 9 is arranged between an opening on the upper portion of the housing 1 and the hydrophobic film 4, the filter 3 is installed on an opening on the upper portion of the housing 1, the reference electrode 5 is installed at the bottom of the gas-supplying cap 18, the electric plate 7 is installed at the bottom of the housing 1, and the bottom of the housing 1 is respectively provided with a first pin 12, a second pin 13 and a third pin 14; the air passing cap 18 covers the upper housing 2, and an O-shaped ring 21 is arranged between the air passing cap 18 and the upper housing 2; the two sides of the gas-feeding cap 18 are respectively communicated with a gas inlet pipe 10 and a gas outlet pipe 11, the upper part of the upper cover shell 2 is provided with a diffusion hole 19, and a dustproof film 20 is arranged on the diffusion hole 19.

Adopt above-mentioned prior art shortcoming: the gas leakage detection device consists of a sensor and a gas leakage cap, sometimes organic gas exists in gas components, and the gas can corrode a sealed rubber ring after a long time to cause poor sealing property, but the gas of a target source is not completely absorbed into the sensor and leaks into cleaner air near an instrument from a gap to cause that the display value of the instrument is lower than an actual value; the free diffusion of gas from the middle diffusion hole to the working electrode takes a long time, the diffusion aspect is divided into transverse diffusion and longitudinal diffusion, and the longitudinal diffusion takes a long time, which results in long gas response time, complex structure, large volume, high failure rate, poor performance and high cost.

Therefore, there is a need for an electrochemical gas sensor with a compact structure with access ports for the above problems.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings in the prior art, it is an object of the present invention to provide an electrochemical gas sensor with an inlet/outlet interface to solve the above-mentioned problems.

An electrochemical gas sensor with an inlet and outlet interface comprises a shell, an upper cover shell, a filter, a working electrode, a reference electrode, a counter electrode and a liquid storage tank, wherein the upper cover shell is arranged on the shell, the liquid storage tank is arranged in the shell, the working electrode, the reference electrode and a counter electrode are arranged on the upper portion of the liquid storage tank, the working electrode, the reference electrode and the counter electrode are separated through glass fiber wafers, a hydrophobic membrane is arranged on the upper portion of the working electrode, a sealing ring is arranged between an opening on the upper portion of the shell and the hydrophobic membrane, the filter is arranged on an opening on the upper portion of the shell, two side edges of the upper cover shell are respectively communicated with a gas inlet pipe and a gas outlet pipe, a first pin, a second pin and a third pin are respectively arranged at the bottom of the shell, the working electrode is connected to the first pin through a lead wire, the reference electrode is connected to the second pin through a lead, and the counter electrode is connected to the third pin through a lead.

Preferably, the liquid storage tank is filled with a liquid absorption material, and a liquid storage cover is arranged at the upper part of the liquid storage tank.

Preferably, the counter electrode is arranged on the upper part of the liquid storage cover

Preferably, the reference electrode is located on an upper portion of the counter plate.

Preferably, the sealing ring is an O-shaped sealing ring.

Compared with the prior art, the utility model has the beneficial effects that: the upper part of the working electrode of the sensor is completely opened, the gas flows in a turbulent flow state at a high flow speed when entering the sensor, and the gas can be directly contacted with the working electrode, so that the gas detection response speed is improved; compact structure, small volume, fast response, low cost and more reliability.

Drawings

FIG. 1 is a prior art gas sensor block diagram;

FIG. 2 is a block diagram of an electrochemical gas sensor with an access port according to the present invention;

FIG. 3 is a schematic view of the present invention in an expanded state;

FIG. 4 is a view of the internal cross-section of the present invention;

fig. 5 is a view showing the internal cross-section of the upper casing of the present invention.

Reference numbers in the figures: 1. a housing; 2. an upper housing; 3. a filter; 4. a hydrophobic membrane; 5. a working electrode; 6. a reference electrode; 7. a counter plate; 8. a liquid storage tank; 9. a seal ring; 10. a gas inlet pipe; 11. a gas outlet pipe; 12. a third pin; 13. a second pin; 14. a first pin; 15. a wire; 17. an insulating plate; 18. a ventilation cap; 19. a diffusion hole; 20. a dust-proof film; 21. an O-shaped ring; 22. a glass fiber wafer; 23. a liquid storage cover; 24. a liquid absorbent material.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 2 and fig. 3 to 5, an electrochemical gas sensor with an inlet and outlet port includes a housing 1, an upper housing 2, a filter 3, a working electrode 5, a reference electrode 6, a counter electrode 7 and a liquid storage tank 8, wherein the upper housing 2 is mounted on the housing 1, the liquid storage tank 8 is mounted in the housing 1, the working electrode 5, the reference electrode 6 and the counter electrode 7 are mounted on the upper portion of the liquid storage tank 8, the working electrode 5 and the reference electrode 6 and the counter electrode 7 are separated by a glass fiber disc 22, a hydrophobic membrane 4 is disposed on the upper portion of the working electrode 5, a sealing ring 9 is disposed between an upper opening of the housing 1 and the hydrophobic membrane 4, the filter 3 is mounted on the upper opening of the housing 1, and a gas inlet pipe 10 and a gas outlet pipe 11 are respectively connected to two sides of the upper housing 2, the bottom of the shell 1 is respectively provided with a first pin 12, a second pin 13 and a third pin 14, the working electrode 5 is connected to the first pin 14 through a wire 15, the reference electrode 6 is connected to the second pin 13 through a wire, and the counter electrode 7 is connected to the third pin 12 through a wire 15.

Further, the liquid storage tank 8 is filled with a liquid absorbing material 24 (optionally liquid absorbing paper), and a liquid storage cover 23 is arranged on the upper portion of the liquid storage tank 8.

Further, the counter electrode 7 is mounted on the upper portion of the reservoir cover 23.

Further, the reference electrode 6 is located on the upper portion of the counter electrode 7.

Further, the sealing ring 9 is an O-shaped sealing ring.

The beneficial effects of the further technical scheme are as follows: the O-shaped sealing ring plays a role in sealing.

Compared with the prior art, the utility model has the beneficial effects that: the working electrode 5 of the sensor is positioned above the liquid storage tank 2, the upper part of the working electrode 5 is completely opened, gas can flow in a turbulent flow state when entering the sensor, and the gas can be directly contacted with the working electrode 5, so that the gas detection response speed is improved; the structure is compact, the volume is small, the response is fast, the cost is low, and the reliability is higher; the thickness and porosity of the hydrophobic membrane 4 can be used to control the amount of gas entering the working electrode and thus the sensitivity of the gas sensor.

The working principle is as follows:

the chemical gas generates electrochemical oxidation or reduction reaction on the working electrode, and the generated current and the gas concentration are in a linear relation, so that the gas concentration can be measured by measuring the generated current.

The filter 3 and the hydrophobic membrane 4 are used for filtering some interference gases in the test gas and avoiding the interference gases from generating wrong interference signals, and the thickness and the porosity of the hydrophobic membrane 4 can be used for controlling the amount of the gas entering the working electrode so as to control the sensitivity of the gas sensor.

A sealing ring 9 is arranged between the opening at the upper part of the shell 1 and the hydrophobic membrane 4, the sealing ring 9 plays a role in sealing, and gas is prevented from directly entering electrolyte to influence the normal work of an electrode, so that the detection of the gas concentration is influenced.

The upper part of the working electrode 5 is contacted with the hydrophobic membrane 4, the filter 3 is positioned on the upper part of the hydrophobic membrane 4, the upper part of the filter 3 is completely opened, gas can flow in a turbulent flow state when entering the sensor and is diffused towards the working electrode 5, and the gas can be directly contacted with the working electrode 5, so that the gas detection response speed is improved.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (5)

1. An electrochemical gas sensor with an inlet and outlet interface, comprising: comprises a shell (1), an upper cover shell (2), a filter (3), a working electrode (5), a reference electrode (6), a counter electrode (7) and a liquid storage tank (8), wherein the upper cover shell (2) is arranged on the shell (1), the liquid storage tank (8) is arranged in the shell (1), the working electrode (5), the reference electrode (6) and a counter electrode (7) are arranged on the upper part of the liquid storage tank (8), the working electrode (5) and the reference electrode (6) as well as the reference electrode (6) and the counter electrode (7) are separated by a glass fiber wafer (22), a hydrophobic membrane (4) is arranged on the upper part of the working electrode (5), a sealing ring (9) is arranged between the upper opening of the shell (1) and the hydrophobic membrane (4), the filter (3) is arranged at the upper opening of the shell (1), and the two side edges of the upper cover shell (2) are respectively communicated with a gas outlet pipe (10) and a gas outlet pipe (11), the bottom of casing (1) is provided with first pin (12), second pin (13) and third pin (14) respectively, working electrode (5) are connected in first pin (14) through wire (15) wire, reference electrode (6) are connected in second pin (13) through the wire, to electroplax (7) through wire (15) connection third pin (12).

2. The electrochemical gas sensor with an access port of claim 1, wherein: the liquid storage tank (8) is filled with a liquid absorption material (24), and a liquid storage cover (23) is arranged on the upper portion of the liquid storage tank (8).

3. The electrochemical gas sensor with an access port of claim 1 wherein: the counter electrode (7) is arranged on the upper part of the liquid storage cover (23).

4. The electrochemical gas sensor with an access port of claim 1, wherein: the reference electrode (6) is positioned on the upper part of the counter electrode (7).

5. The electrochemical gas sensor with an access port of claim 1 wherein: the sealing ring (9) is an O-shaped sealing ring.

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