Packaging device of electrochemical sensor

Abstract

The utility model provides a packaging device of an electrochemical sensor. According to the packaging device, the upper end of a shell is open, a liquid injection channel extending into the shell is formed in a bottom plate of the shell, a sealing plug is used for plugging the liquid injection channel, and a sensor pin is inserted into the bottom plate; the tray is coaxially arranged in the shell, and the space, below the tray, in the shell is an electrolyte storage area; the edge of the upper end of the ring-shaped sealing structure extends outwards and is turned over to form an annular groove with a downward groove opening, the lower edge of the outer groove wall of the ring-shaped sealing structure forms an annular knife edge part, and a plurality of concentric circle grooves are formed in the lower end face of the ring-shaped sealing structure. The ring-shaped sealing structure is coaxially arranged in the shell and located above the tray, and the annular knife edge part is embedded in the inner wall of the shell and welded to the inner wall of the shell. The working electrode is attached to the lower end of the ring-shaped sealing structure; and the end cover with an air inlet hole is arranged at the upper end of the ring-shaped sealing structure. According to the utility model, the problem of inaccurate gas concentration detection result easily caused by the fact that the existing electrochemical sensor adopts an O-ring sealing mode to prevent liquid leakage at the edge of the working electrode can be solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sensor packaging field, more specifically, relate to a kind of packaging device of electrochemical sensor. BACKGROUND

[0002] With the development of electronic technology and detection technology, various types of sensors are more and more widely used in various industries. Among them, electrochemical sensors are widely used in hazardous gas detection in chemical industry, coal mine, environmental protection, health and other fields because they can respond to a variety of harmful gases, have simple structure and low cost.

[0003] Electrochemical sensors detect the concentration of the measured gas by reacting with the measured gas and generating an electric signal proportional to the gas concentration. A typical electrochemical sensor consists of a working electrode, a counter electrode and a reference electrode, separated by a thin electrolyte layer, and belongs to a three-electrode sensor. The gas diffused through the barrier reacts with the working electrode, which can use oxidation mechanism or reduction mechanism. These reactions are catalyzed by electrode materials designed for the measured gas, and the current proportional to the measured gas concentration will flow between the anode and the cathode through the resistor connected between the electrodes. The signal is amplified by an amplifier circuit and converted into the concentration value of the measured gas. It can usually detect ppm or even ppb level. Because of the current generated in the above process, electrochemical sensors are also commonly known as current gas sensors or micro fuel cells.

[0004] For existing electrochemical sensors, in order to prevent liquid leakage at the edge of the working electrode, O-ring sealing is usually used. However, O-ring is generally made of rubber material, which has certain adsorption capacity for special gases (such as NH3, HF / HCl, etc.), which can easily lead to inaccurate detection results. UTILITY MODEL CONTENT

[0005] The utility model aims to solve the problem that the existing electrochemical sensor is prone to inaccurate gas concentration detection results due to the use of O-ring sealing to prevent liquid leakage at the edge of the working electrode.

[0006] In order to achieve the above purpose, the utility model provides a packaging device of electrochemical sensor, which comprises a shell, a tray, a ring-shaped sealing structure, an end cover, at least two sensor pins and a sealing plug.

[0007] The shell has opposite first and second ends, the first end is open, a bottom plate is provided on the second end, a liquid injection channel extending into the shell is formed on the bottom plate, the sealing plug is used to plug the liquid injection channel, and the at least two sensor pins are all arranged through the bottom plate.

[0008] The tray is coaxially arranged in the shell, and an inner space of the shell below the tray is an electrolyte storage area;

[0009] The annular sealing structure has an open upper end and a lower end, an edge of the upper end extends outward and is turned to form a downwardly-facing annular groove, a lower edge of an outer groove wall of the annular groove forms an annular knife edge part, and a plurality of concentric circular grooves are formed on an end face of the lower end;

[0010] The annular sealing structure is coaxially arranged in the shell above the tray, and the annular knife edge part is embedded on an inner wall of the shell and is fused to the inner wall by ultrasonic welding;

[0011] The electrochemical sensor has a working electrode, the working electrode is arranged on the lower end of the annular sealing structure, and a cross section of a part of the working electrode that is in contact with the end face of the lower end is wavy;

[0012] The end cover is arranged on the upper end of the annular sealing structure, and an air inlet hole is arranged on the end cover.

[0013] Optionally, the number of sensor pins is three, and the three sensor pins are distributed around the liquid injection channel;

[0014] A first end of the sensor pin penetrates the bottom plate from the inside of the shell and extends out, and a second end of the sensor pin is located in the shell and is closer to the bottom plate relative to an inner side port of the liquid injection channel.

[0015] Optionally, a first end of the sealing plug extends into the liquid injection channel from an outer side port of the liquid injection channel and beyond an inner side port of the liquid injection channel, and a second end of the sealing plug is left outside the bottom plate.

[0016] Optionally, an epoxy glue layer is formed in the inside of the shell by filling epoxy glue, the epoxy glue layer is distributed around the liquid injection channel, and a height of the epoxy glue layer is consistent with a height of the inner side port of the liquid injection channel;

[0017] An upper surface of the epoxy glue layer is used to contact the electrolyte.

[0018] Optionally, an inner space of the shell between the annular sealing structure and the tray is an electrode placement area;

[0019] The electrode placement area is used to accommodate a working electrode, a first glass fiber filter paper, a reference electrode, a second glass fiber filter paper, and a count electrode that are arranged from top to bottom and are pressed together;

[0020] A glass fiber filter strip is drawn out on the count electrode, and the free end of the glass fiber filter strip enters the electrolyte storage area from the open area on the tray.

[0021] Optionally, the tray comprises a tray body and a plurality of baffle strips arranged on the edge of the tray body.

[0022] The plurality of baffle strips are evenly distributed along the circumferential direction of the tray body and are perpendicular to the tray body.

[0023] The free ends of the plurality of baffle strips extend into the annular groove.

[0024] Optionally, the area enclosed by the end cover, the ring-shaped sealing structure and the working electrode constitutes a filter material filling area.

[0025] The filter material filled in the filter material filling area is used to filter out predetermined interfering gases.

[0026] Optionally, the packaging device further comprises a waterproof and breathable film arranged on the upper surface of the end cover.

[0027] Optionally, a hot melt medium layer is arranged between the working electrode and the lower end surface of the ring-shaped sealing structure.

[0028] Optionally, the three sensor pins are respectively used for electrical connection with the working electrode, the reference electrode and the count electrode.

[0029] The beneficial effects of the utility model lie in:

[0030] The packaging device of the electrochemical sensor disclosed by the utility model forms a plurality of concentric circular grooves on the lower end surface of the ring-shaped sealing structure. When the working electrode of the electrochemical sensor is attached and arranged on the lower end of the ring-shaped sealing structure, the cross section of the part of the working electrode attached to the lower end surface of the ring-shaped sealing structure is wavy. Such arrangement can effectively prevent the occurrence of the working electrode edge liquid leakage problem. Since the packaging device of the electrochemical sensor of the utility model does not use an O-ring seal, the electrochemical sensor using the same does not involve the problem that the existing electrochemical sensor is prone to inaccurate gas concentration detection results due to the use of the O-ring sealing method to prevent working electrode edge liquid leakage. Therefore, compared with the existing electrochemical sensor using the O-ring sealing method, the gas concentration detection result accuracy of the electrochemical sensor using the packaging device of the utility model is higher.

[0031] Other features and advantages of the utility model will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application can be better understood by reference to the following description taken in conjunction with the accompanying drawings in which like elements are marked with the same or similar reference numerals throughout the several views.

[0033] Fig. 1 An exploded view of a packaging device for an electrochemical sensor is shown from a first perspective according to an embodiment of the present application;

[0034] Fig. 2 An exploded view of a packaging device for an electrochemical sensor is shown from a second perspective according to an embodiment of the present application;

[0035] Fig. 3 A cross-sectional view of a packaging device for an electrochemical sensor is shown according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to more fully understand the technical solutions of the present application, in the following, exemplary embodiments of the present application will be described more fully and in detail with reference to the accompanying drawings. Obviously, one or more of the embodiments of the present application described below are only one or more of the specific manners of implementing the technical solutions of the present application, and are not exhaustive. It should be understood that the technical solutions of the present application can be implemented in other manners belonging to the general inventive concept without creative labor, and should not be limited by the exemplary described embodiments. Based on one or more embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0037] Embodiment: Fig. 1 An exploded view of a packaging device for an electrochemical sensor is shown from a first perspective according to an embodiment of the present application, Fig. 2 An exploded view of a packaging device for an electrochemical sensor is shown from a second perspective according to an embodiment of the present application, Fig. 3 A cross-sectional view of a packaging device for an electrochemical sensor is shown according to an embodiment of the present application. With reference to Figs. 1 to 3 The packaging device for an electrochemical sensor according to the embodiment of the present application comprises a shell 100, a tray 200, a ring-shaped sealing structure 300, an end cover 400, three sensor pins 500, and a sealing plug 600.

[0038] The shell 100 has opposite first and second ends, the first end of the shell 100 is open, a bottom plate 110 is arranged on the second end of the shell 100, a liquid injection channel 120 extending to the inside of the shell 100 is formed on the bottom plate 110, a sealing plug 600 is used for plugging the liquid injection channel 120, and three sensor pins 500 are all arranged through the bottom plate 110;

[0039] The tray 200 is coaxially arranged in the shell 100, and an internal space of the shell 100 below the tray 200 is an electrolyte storage area;

[0040] The ring-shaped sealing structure 300 has an open upper end and a lower end, the edge of the upper end of the ring-shaped sealing structure 300 extends outward and is turned to form a ring-shaped groove 310 with a notch downward, the lower edge of the outer groove wall of the ring-shaped groove 310 constitutes a ring-shaped knife edge part 311, and a plurality of concentric circular grooves are formed on the end face of the lower end of the ring-shaped sealing structure 300;

[0041] The ring-shaped sealing structure 300 is coaxially arranged in the shell 100 and above the tray 200, the ring-shaped knife edge part 311 is embedded on the inner wall of the shell 100 and is fused to the inner wall of the shell 100 by ultrasonic welding;

[0042] The electrochemical sensor has a working electrode, the working electrode is arranged in close contact with the lower end of the ring-shaped sealing structure 300, and the cross section of the part, where the working electrode is in close contact with the lower end of the ring-shaped sealing structure 300, is wavy;

[0043] The end cover 400 is arranged on the upper end of the ring-shaped sealing structure 300, and the air inlet hole 410 is arranged on the end cover 400.

[0044] Specifically, in the embodiment of the utility model, three vertical support strips 150 are arranged on the inner wall of the shell 100, and the three support strips 150 are uniformly distributed along the circumferential direction. The tray 200 is arranged on the three support strips 150.

[0045] Further, in the embodiment of the utility model, the three sensor pins 500 are distributed around the liquid injection channel 120;

[0046] The first end of the sensor pin 500 penetrates the bottom plate 110 from the inside of the shell 100 and extends out, and the second end of the sensor pin 500 is located in the shell 100 and is closer to the bottom plate 110 relative to the inner side port of the liquid injection channel 120.

[0047] Still further, in the embodiment of the utility model, the first end of the sealing plug 600 extends into the liquid injection channel 120 from the outer side port of the liquid injection channel 120 and exceeds the inner side port of the liquid injection channel 120, and the second end of the sealing plug 600 is left on the outer side of the bottom plate 110.

[0048] Further, the epoxy glue layer is formed in the inside of the shell 100 by filling epoxy glue, the epoxy glue layer is distributed in the periphery of the liquid injection channel 120, the height of the epoxy glue layer is consistent with the height of the inside port of the liquid injection channel 120;

[0049] The upper surface of the epoxy glue layer is used for contacting with the electrolyte.

[0050] Specifically, the epoxy glue layer formed in the bottom of the shell 100 can seal the peripheral part of the liquid injection channel 120, cover the corresponding part of the three sensor pins 500, and effectively prevent the electrolyte from leaking out from the bottom of the sensor.

[0051] Further, the inside space of the shell 100 between the ring-shaped sealing structure 300 and the tray 200 is the electrode placement area 130.

[0052] The electrode placement area 130 is used for accommodating the working electrode, the first glass fiber filter paper, the reference electrode, the second glass fiber filter paper and the count electrode which are distributed from top to bottom and are tightly arranged together.

[0053] The glass fiber filter paper strip is led out on the count electrode, and the free end of the glass fiber filter paper strip enters the electrolyte storage area from the open area on the tray 200.

[0054] Specifically, a plurality of open areas are arranged on the tray 200, the plurality of open areas are centrally arranged in the middle area of the tray 200, and the free end of the glass fiber filter paper strip enters the electrolyte storage area from one of the open areas to adsorb the electrolyte. At the same time, the plurality of open areas are arranged to keep the internal pressure of the electrochemical sensor balanced.

[0055] Specifically, the edge of the upper end of the ring-shaped sealing structure 300 extends outward and is turned over to form a ring-shaped groove 310 with a notch downward, and the lower edge of the outer groove wall of the ring-shaped groove 310 constitutes a ring-shaped knife edge part 311. The ring-shaped sealing structure 300 is coaxially arranged in the shell 100, and an inwardly recessed ring is arranged at the position of the inner wall of the shell 100 corresponding to the ring-shaped knife edge part 311. The ring-shaped knife edge part 311 and the inwardly recessed ring are fused together by ultrasonic welding, so as to prevent the electrolyte from leaking out. At the same time, by controlling the ultrasonic welding, the height of the electrode placement area 130 can be adjusted, the tightness between the electrodes is adjusted, and the resistance between the electrodes and the sensor pins is adjusted, so as to control the reaction rate of the sensor.

[0056] Further, the tray 200 includes a plurality of baffle strips 210 arranged on the edge of the tray body.

[0057] The plurality of baffle strips 210 are evenly distributed along the circumferential direction of the tray body and are perpendicular to the tray body.

[0058] The free ends of the plurality of baffle strips 210 extend into the annular groove 310.

[0059] Specifically, in the embodiment of the utility model, a plurality of baffle strips 210 are evenly arranged along the edge of the tray body, and the plurality of baffle strips 210 are used to limit the inner circle diameter of the tray 200 and play a limiting role.

[0060] Further, in the embodiment of the utility model, the area enclosed by the end cover 400, the ring-shaped sealing structure 300 and the working electrode in the shell 100 forms a filter material filling area 140.

[0061] The filter material filled in the filter material filling area 140 is used to filter out the predetermined interference gas.

[0062] Specifically, in the embodiment of the utility model, the filter material filled in the filter material filling area 140 is used to filter out the predetermined interference gas, thereby effectively controlling the cross-reaction of the interference gas on the electrochemical sensor.

[0063] Further, the packaging device of the electrochemical sensor of the embodiment of the utility model further includes a waterproof breathable film 700, and the waterproof breathable film 700 is arranged on the upper surface of the end cover 400.

[0064] Specifically, in the embodiment of the utility model, by adjusting the air inlet hole 410 on the end cover 400, the detection resolution of the corresponding electrochemical sensor can be controlled, and the minimum can reach ppb level.

[0065] Specifically, in the embodiment of the utility model, the arrangement of the waterproof breathable film 700 can effectively prevent the air inlet hole 410 from being blocked, thereby prolonging the service life of the electrochemical sensor.

[0066] Further, in the embodiment of the utility model, a hot melt medium layer is arranged between the working electrode and the lower end surface of the ring-shaped sealing structure 300.

[0067] Specifically, in the embodiment of the utility model, the working electrode is arranged on the lower end of the ring-shaped sealing structure 300 through the hot melt medium layer.

[0068] Further, the three sensor pins are respectively used for electrically connecting with the working electrode, the reference electrode and the count electrode.

[0069] The principle of the electrochemical sensor of the packaging device is oxidation or reduction reaction, the electrode acts as a catalyst, the toxic and harmful gas is oxidized or reduced to generate ions, and is converted into electrons, the current is detected through the sensor pin and the amplification circuit, and is converted into the ppm of the entering gas.

[0070] Although one or more embodiments of the present application have been described above, it should be understood by those skilled in the art that the present application can be implemented in any other form without departing from the spirit and scope of the present application. Therefore, the above-described embodiments are illustrative rather than limiting, and many modifications and substitutions are obvious to those skilled in the art without departing from the spirit and scope of the present application as defined in the appended claims.

Claims

1. A packaging device for an electrochemical sensor, characterized in that, Includes housing, tray, ring-shaped sealing structure, end cap, at least two sensor pins, and sealing plug; The housing has a first end and a second end opposite to each other. The first end is open, and a base plate is provided on the second end. An injection channel extending into the interior of the housing is formed on the base plate. The sealing plug is used to block the injection channel. The at least two sensor pins are both disposed through the base plate. The tray is coaxially built into the housing, and the internal space of the housing below the tray is the electrolyte storage area; The ring-shaped sealing structure has an open upper end and a lower end. The edge of the upper end extends outward and flips to form an annular groove with the opening facing downward. The lower edge of the outer groove wall of the annular groove forms an annular knife edge. Multiple concentric circular grooves are formed on the end face of the lower end. The ring-shaped sealing structure is coaxially built into the housing and located above the tray. The annular blade is embedded in the inner wall of the housing and is fused to the inner wall by ultrasonic welding. The electrochemical sensor has a working electrode, which is attached to the lower end of the ring-shaped sealing structure. The cross-section of the portion of the working electrode that is attached to the end face of the lower end is wavy. The end cap is disposed on the upper end of the ring-shaped sealing structure, and an air inlet is provided on the end cap.

2. The packaging device for the electrochemical sensor according to claim 1, characterized in that, The sensor has three pins, which are distributed around the injection channel. The first end of the sensor pin extends through the bottom plate from the inside of the housing, and the second end of the sensor pin is located inside the housing and is closer to the bottom plate than the inner port of the injection channel.

3. The packaging device for the electrochemical sensor according to claim 2, characterized in that, The first end of the sealing plug extends into the outer port of the injection channel and beyond the inner port of the injection channel, while the second end of the sealing plug remains on the outer side of the base plate.

4. The packaging device for the electrochemical sensor according to claim 3, characterized in that, An epoxy layer is formed inside the housing by filling it with epoxy resin. The epoxy layer is distributed around the periphery of the injection channel, and the height of the epoxy layer is consistent with the height of the inner port of the injection channel. The upper surface of the epoxy adhesive layer is used to contact the electrolyte phase.

5. The packaging device for the electrochemical sensor according to claim 4, characterized in that, The internal space of the housing between the ring-shaped sealing structure and the tray is the electrode placement area; The electrode placement area is used to accommodate the working electrode, the first glass fiber filter paper, the reference electrode, the second glass fiber filter paper, and the counting electrode, which are distributed from top to bottom and pressed together. A glass fiber filter paper strip is led out from the counting electrode, and the free end of the glass fiber filter paper strip enters the electrolyte storage area from the open area on the tray.

6. The packaging device for the electrochemical sensor according to claim 5, characterized in that, The pallet includes a pallet body and a plurality of baffle strips disposed on the edge of the pallet body; The plurality of baffle strips are evenly distributed along the circumference of the pallet body and are all perpendicular to the pallet body; The free ends of the plurality of baffle strips all extend into the annular groove.

7. The packaging device for the electrochemical sensor according to claim 6, characterized in that, The area enclosed by the end cap, the ring-shaped sealing structure, and the working electrode constitutes the filter material filling area; The filter material filling area is used to filter out predetermined interfering gases.

8. The packaging device for the electrochemical sensor according to claim 7, characterized in that, It also includes a waterproof and breathable membrane disposed on the upper surface of the end cap.

9. The packaging device for the electrochemical sensor according to claim 8, characterized in that, A hot melt medium layer is provided between the working electrode and the lower end face of the ring-shaped sealing structure.

10. The packaging device for the electrochemical sensor according to claim 9, characterized in that, The three sensor pins are respectively used to electrically connect to the working electrode, the reference electrode, and the counting electrode.

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