Electrochemical gas sensor

Abstract

The utility model relates to an electrochemical gas sensor, which comprises an upper shell and a lower shell arranged below the upper shell, the upper shell is provided with a gas hole and an upper inner cavity, gas enters the upper inner cavity through the gas hole, a filter and a fixing frame are arranged in the upper inner cavity, and the fixing frame is provided with a gas inlet and a gas outlet. The fixing frame is located below the filter to support the filter, the lower shell is provided with a lower inner cavity, an electrode A, an electrode B, an electrode C and a support are sequentially arranged in the lower inner cavity from top to bottom, and non-woven fabric layers are arranged between the electrode A and the electrode B, between the electrode B and the electrode C and between the electrode C and the support. The support is a hollow groove with an opening in the bottom, the interior of the hollow groove is used for containing electrolyte, and a plurality of open holes are formed in the top of the hollow groove. The filter is suitable for electrochemical CO sensors and other electrochemical gas sensors, the liquid leakage problem is solved, the filter falling or moving problem is solved, the stability of the sensors is improved, and the long-term service life of the sensors is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to an electrochemical gas sensor. Background Art

[0002] Electrochemical CO sensors have many advantages such as small size, simple structure, portability, and affordable price. They are widely used in petroleum, chemical industry, coal mining, shipping, forging, coke, shopping malls, homes and other fields. They are receiving more and more attention and are also a popular research direction and topic for researchers.

[0003] However, current electrochemical sensors have the following main problems:

[0004] (1) The structure and internal components are complex. Chinese patents CN103926277 A, CN 2456165Y and CN 102192931B all disclose the use of complex structural parts to assemble sensors, and the internal components are also relatively complex, which not only increases the production cost but also increases the difficulty of production.

[0005] (2) Leakage problem: Most of the current electrochemical gas sensors use liquid electrolytes, which have a greater risk of leakage. Too little loading will affect the service life and stability of the sensor.

[0006] (3) The filter is easy to fall or move during use.

[0007] (4) The sensor leads are not in firm contact with the electrodes, resulting in unstable sensor performance or failure. Utility Model Content

[0008] In view of the shortcomings of the existing technologies, the utility model provides an electrochemical gas sensor suitable for CO, which reduces leakage problems, overcomes the problem of filter falling or moving, and improves sensor stability and long-term life.

[0009] To achieve the above-mentioned purpose, the present invention provides an electrochemical gas sensor having the following technical solution: the sensor includes an upper shell and a lower shell installed under the upper shell, the upper shell has an air hole and an upper inner cavity, the gas enters the upper inner cavity through the air hole, a filter and a fixing frame are arranged in the upper inner cavity, the fixing frame is located below the filter to support the filter, the lower shell has a lower inner cavity, the lower inner cavity is sequentially provided with an A electrode, a B electrode, a C electrode and a bracket from top to bottom, a non-woven fabric layer is arranged between the A electrode and the B electrode, between the B electrode and the C electrode, and between the C electrode and the bracket, the bracket is a hollow groove with an opening at the bottom, the interior of the hollow groove is used to accommodate an electrolyte, and several openings are arranged on the top of the hollow groove.

[0010] Preferably, the upper shell and the lower shell have the same outer diameter, the inner diameter of the upper shell is smaller than the inner diameter of the lower shell, and the upper inner cavity and the lower inner cavity are connected.

[0011] Preferably, the diameter of the upper inner cavity is 5-15 mm and the height is 1-3 mm.

[0012] Preferably, the air holes are covered with a breathable film.

[0013] Preferably, the diameter of the pores is 0.5-3 mm.

[0014] Preferably, the fixing frame is a cross or "M"-shaped fixing frame composed of 2 to 4 components, and a middle area of the fixing frame has a through hole.

[0015] Preferably, the fixing frame and the upper shell are integrally formed or are detachable.

[0016] Preferably, three through holes are provided on the bottom of the lower shell for passing and fixing corresponding pins, and the pins are connected to corresponding electrodes through leads.

[0017] Preferably, the lead wires are connected to corresponding electrodes through openings of the bracket.

[0018] Preferably, the side surface of the bracket fits with the inner wall of the lower shell, the outer diameter of the bracket matches the inner diameter of the lower shell, and the top surface of the bracket is a horizontal top surface.

[0019] The electrochemical gas sensor of the present invention is suitable for electrochemical CO sensors and is also suitable for other electrochemical gas sensors. It has a simple preparation process, low cost, and is easy to assemble and produce. A fixing frame is provided to support and fix the filter to prevent the filter from falling or moving. Each layer of electrodes is isolated by a non-woven fabric layer, has a washing function, and can reduce the risk of sensor leakage. The bracket can play a supporting role and also allow electrolyte to enter and exit, thereby maximizing the electrolyte loading and improving the life and stability of the sensor. The top surface of the bracket is a horizontal top surface, and the electrodes, leads, non-woven fabric layers, etc. are in close contact to prevent sensor instability and failure problems. A filter is provided to filter out impurities or interfering gases, thereby improving the anti-interference effect of the sensor. A breathable membrane is provided to prevent dust and the like from entering and clogging the air holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments.

[0021] Figure 1 Schematic diagram of the appearance structure of the electrochemical gas sensor of the present invention.

[0022] Figure 2 for Figure 1 Cross-sectional view at AA in the middle.

[0023] Figure 3 Schematic diagram of the structure of the fixing frame in the electrochemical gas sensor of the present invention.

[0024] Figure 4 This is a top view of the structure of the bracket in the electrochemical gas sensor of the present invention.

[0025] Figure 5 Schematic diagram of the connection between pins and leads in the electrochemical gas sensor of the present invention.

[0026] Reference numerals

[0027] 1. Upper shell; 101. Air hole; 102. Upper inner cavity; 103. Fixing frame; 103. Through hole; 2. Lower shell; 201. Through hole; 3. Bracket; 301. Opening; 4. Pin; 5. Lead; 6.A. Electrode; 7.B. Electrode; 8.C. Electrode; 9.A. Non-woven fabric layer; 10.B. Non-woven fabric layer; 11.C. Non-woven fabric layer; 12. Filter; 13. Breathable membrane; 14. Electrolyte. DETAILED DESCRIPTION

[0028] In order to more clearly describe the technical content of the present invention, it is further described below in conjunction with specific embodiments.

[0029] like Figures 1 to 5 Figure 1 shows an embodiment of an electrochemical gas sensor according to the present invention. The sensor comprises an upper shell 1 and a lower shell 2 mounted below the upper shell 1. The upper shell 1 has an air hole 101 and an upper inner cavity 102. Gas enters the upper inner cavity 102 through the air hole 101. A filter 12 and a mounting bracket 103 are provided within the upper inner cavity 102. The filter 12 can filter out impurities such as H2S and interfering gases, providing an anti-interference effect and improving the monitoring accuracy of the electrochemical gas sensor. The upper shell 1 and lower shell 2 can both be made of ABS plastic and can be the same or different colors.

[0030] The fixing frame 103 is located below the filter 12 to support the filter 12. The lower shell 2 has a lower inner cavity, and the gas enters the lower inner cavity through the filter 12 in the upper inner cavity. The lower inner cavity is sequentially provided with an A electrode 6, a B electrode 7, a C electrode 8 and a bracket 3 from top to bottom. Non-woven fabric layers are provided between the A electrode 6 and the B electrode 7, between the B electrode 7 and the C electrode 8, and between the C electrode 8 and the bracket 3. Specifically, an A non-woven fabric layer 9 is provided between the A electrode 6 and the B electrode 7, a B non-woven fabric layer 10 is provided between the B electrode 7 and the C electrode 8, and a C non-woven fabric layer 11 is provided between the C electrode 8 and the bracket 3. The bracket 3 is a hollow groove with an opening at the bottom. The interior of the hollow groove is used to accommodate an electrolyte 14, as shown in FIG. Figure 2 and Figure 4 As shown, several openings 301 are provided at the top of the hollow groove. The bracket can play a supporting role and also allow the electrolyte to flow in and out, thereby maximizing the electrolyte loading and improving the life and stability of the sensor. The openings 301 can be 3 or more, and the openings can also be in the shape of a fence or other polygon. The non-woven fabric layers can be made of the same material or different materials, have a liquid absorption function, and are corrosion-resistant. The electrodes can be the same or different and can be composed of a PTFE breathable membrane and a catalytic material. The PTFE has an air permeability of 500 to 2000 mL / min.

[0031] like Figure 2 As shown, the upper shell 1 and the lower shell 2 have the same outer diameter, the inner diameter of the upper shell 1 is smaller than the inner diameter of the lower shell 2, and the upper inner cavity 102 is connected to the lower inner cavity. The diameter of the upper inner cavity 102 is 5 to 15 mm and the height is 1 to 3 mm.

[0032] like Figure 1 and Figure 2 As shown, the air holes 101 are covered with a breathable membrane 13 to prevent dust and other particles from entering and clogging the holes. The diameter of the air holes 101 is 0.5 to 3 mm, allowing air to flow in and out. The breathable membrane 13 can be one or more composite membranes selected from PTFE, PP, PVDF, and PC, with an air permeability of 500 to 3000 mL / min.

[0033] like Figure 2 and Figure 3 As shown, the fixing frame 103 is a cross-shaped, "M"-shaped, or "*"-shaped fixing frame composed of two to four components. The central area of the fixing frame 103 has a through hole 1031. The fixing frame 103 is integrally formed with the upper housing 1 or can be detachable. The fixing frame 103 secures the filter to prevent it from moving or falling.

[0034] like Figure 1 and Figure 4As shown, the bottom of the lower housing 2 is provided with three through-holes 201 for receiving and securing corresponding pins 4. These pins 4 are connected to corresponding electrodes via leads 5. These leads 5 connect to corresponding electrodes through openings 301 in the bracket 3 to provide electrical conductivity. In other words, three through-holes 201 correspond to three pins 4 and three leads 5. Each electrode catalyst portion is in close contact with its corresponding lead 5. The bottom of the pins 4 can be connected to a circuit board to output sensor signals.

[0035] Thus, the opening 301 of the bracket 3 allows the electrolyte 14 to flow in and out, and can also allow the lead 5 to pass through, while also playing the role of supporting the electrode and the non-woven fabric layer.

[0036] like Figure 2 As shown, the sides of the bracket 3 fit closely against the inner wall of the lower shell 2. The outer diameter of the bracket 2 matches the inner diameter of the lower shell 2. The top surface of the bracket 3 is horizontal. Using a horizontal bracket, the electrodes, leads, and non-woven fabric are in close contact to prevent sensor instability and failure. The bracket 3 can be made of any material, such as ABS, PP, stainless steel, or PTFE. The sides of the bracket 3 are in close contact with the lower shell 2 to prevent shaking.

[0037] The electrochemical gas sensor of the present invention is suitable for electrochemical CO sensors and is also suitable for other electrochemical gas sensors. It has a simple preparation process, low cost, and is easy to assemble and produce. A fixing frame is provided to support and fix the filter to prevent the filter from falling or moving. Each layer of electrodes is isolated by a non-woven fabric layer, has a washing function, and can reduce the risk of sensor leakage. The bracket can play a supporting role and also allow electrolyte to enter and exit, thereby maximizing the electrolyte loading and improving the life and stability of the sensor. The top surface of the bracket is a horizontal top surface, and the electrodes, leads, non-woven fabric layers, etc. are in close contact to prevent sensor instability and failure problems. A filter is provided to filter out impurities or interfering gases, thereby improving the anti-interference effect of the sensor. A breathable membrane is provided to prevent dust and the like from entering and clogging the air holes.

[0038] In this specification, the present invention has been described with reference to specific embodiments thereof. However, it is apparent that various modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the specification and drawings are to be regarded as illustrative rather than restrictive.

Claims

1. An electrochemical gas sensor, characterized in that The sensor includes an upper shell and a lower shell installed under the upper shell. The upper shell has an air hole and an upper inner cavity. The gas enters the upper inner cavity through the air hole. A filter and a fixing frame are arranged in the upper inner cavity. The fixing frame is located below the filter to support the filter. The lower shell has a lower inner cavity. The lower inner cavity is sequentially provided with an A electrode, a B electrode, a C electrode and a bracket from top to bottom. A non-woven fabric layer is arranged between the A electrode and the B electrode, between the B electrode and the C electrode, and between the C electrode and the bracket. The bracket is a hollow groove with an opening at the bottom. The interior of the hollow groove is used to accommodate an electrolyte. Several openings are arranged on the top of the hollow groove.

2. The electrochemical gas sensor according to claim 1, characterized in that The upper shell and the lower shell have the same outer diameter, the inner diameter of the upper shell is smaller than the inner diameter of the lower shell, and the upper inner cavity and the lower inner cavity are connected.

3. The electrochemical gas sensor according to claim 1, wherein The diameter of the upper inner cavity is 5 to 15 mm, and the height is 1 to 3 mm.

4. The electrochemical gas sensor according to claim 1, wherein The air holes are covered with a breathable film.

5. The electrochemical gas sensor according to claim 1, wherein The diameter of the pores is 0.5 to 3 mm.

6. The electrochemical gas sensor according to claim 1, wherein The fixing frame is a cross or "M"-shaped fixing frame composed of 2 to 4 components, and the middle area of the fixing frame has a through hole.

7. The electrochemical gas sensor according to claim 1, wherein The fixing frame and the upper shell are integrally formed or detachable.

8. The electrochemical gas sensor according to claim 1, wherein The bottom of the lower shell is provided with three through holes for passing and fixing corresponding pins, and the pins are connected to corresponding electrodes through leads.

9. The electrochemical gas sensor according to claim 8, characterized in that The lead wires are connected to corresponding electrodes through the openings of the bracket.

10. The electrochemical gas sensor according to claim 1, wherein The side surface of the bracket is fitted with the inner wall of the lower shell, the outer diameter of the bracket matches the inner diameter of the lower shell, and the top surface of the bracket is a horizontal top surface.

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