Electrochemical gas sensor shell and electrochemical gas sensor

Abstract

The utility model relates to an electrochemical gas sensor shell and an electrochemical gas sensor. The shell comprises an upper cover and a shell body, an air inlet is formed in the upper cover, the liquid storage tank is arranged between the upper cover and the shell body, an opening of the liquid storage tank faces upwards, a sealing ring is arranged between the liquid storage tank and the upper cover, and a liquid injection opening is formed in the liquid storage tank and used for injecting an electrolyte solution. The upper cover and the shell are connected through a buckle structure so that the liquid storage tank and the upper cover can extrude the sealing ring at the same time to achieve sealing between the liquid storage tank and the upper cover. An independent liquid storage tank is arranged for storing an electrolyte solution, a sealing ring is arranged between the liquid storage tank and the upper cover for sealing, the upper cover and the shell are connected through a buckle structure, and the sealing ring between the upper cover and the liquid storage tank is extruded in the connecting process of the upper cover and the shell so as to seal the electrolyte solution and prevent liquid leakage. The shell with the structure is convenient to install and can well prevent the electrolyte solution from leaking.

Description

Technical Field

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

[0002] An electrochemical gas sensor is a detector that oxidizes or reduces the gas being measured at electrodes and measures the current to determine the gas concentration. The gas first passes through micropores in the upper cover and reaches the surface of the sensing electrode, where it undergoes oxidation or reduction. A resistor connected between the electrodes causes a current proportional to the concentration of the gas being measured to flow between the positive and negative electrodes. This current is then measured to determine the gas concentration.

[0003] A typical electrochemical gas sensor consists of a breathable membrane, electrodes (including a working electrode, a reference electrode, and a counter electrode), an electrolyte, and a filter. Electrolyte is required to connect and conduct the electrodes, necessitating a sealed connection between the sensor cover and the housing. Currently, the main sealing methods include threads, sealants, and ultrasonic welding. Sealant and threaded sealing methods are aesthetically pleasing, and due to the large sealing area, they can easily fail to seal completely, leading to leakage during use and compromising sensor performance. Ultrasonic welding offers advantages such as high connection strength, aesthetics, and time savings, making it the most commonly used packaging method for electrochemical gas sensors.

[0004] However, during ultrasonic welding, sensor performance can be affected when the ultrasonic energy is too high or too low. When the ultrasonic energy is too high, the micropores in the upper cover are easily affected, resulting in inconsistent air intake and, consequently, sensor signal consistency. When the ultrasonic energy is too low, the solution leaks between the upper cover and the housing. Therefore, a new electrochemical gas sensor housing structure is needed to address the leakage issues currently faced by existing electrochemical gas sensor housings. Utility Model Content

[0005] The purpose of the present utility model is to provide an electrochemical gas sensor housing to solve the problem of easy leakage of the housing in the prior art; at the same time, the purpose of the present utility model is also to provide an electrochemical gas sensor using the above housing.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solution for an electrochemical gas sensor housing: an electrochemical gas sensor housing, comprising an upper cover and a shell, the upper cover being provided with an air inlet hole, and also comprising a liquid storage tank arranged between the upper cover and the shell, the liquid storage tank opening upward and a sealing ring being provided between the liquid storage tank and the upper cover, the liquid storage tank being provided with a liquid injection port for injecting electrolyte solution, the upper cover and the shell being connected by a snap-fit structure so that the liquid storage tank and the upper cover can squeeze the sealing ring at the same time to achieve a seal between the two.

[0007] A step is provided on the inner wall of the liquid storage tank, a sealing ring is provided on the step surface, and an extrusion protrusion for extruding the sealing ring is provided on the inner wall of the upper cover.

[0008] A step structure is provided on the extrusion surface of the extrusion protrusion, so that the extrusion surface has a horizontal extrusion portion and an inclined extrusion portion that gradually extends inward from top to bottom.

[0009] A boss is provided on the outer peripheral wall of the liquid storage tank, and the liquid injection port is provided on the boss. The boss divides the liquid storage tank into an upper part and a lower part of the liquid storage tank. The lower part of the liquid storage tank is located inside the shell, and the upper part of the liquid storage tank is located inside the upper cover. A first arc groove is provided on the side wall of the upper cover to match the positioning of the upper part of the boss, and a second arc groove is provided on the side wall of the shell to match the positioning of the lower part of the boss.

[0010] The shell is provided with a mounting hole for installing the pin, and the outer wall of the liquid storage tank is provided with a mounting groove for installing the platinum wire connected to the pin.

[0011] A first step is provided on the outer circumferential surface of the shell, and a second step is provided on the outer circumferential surface of the liquid storage tank. The step surface of the second step contacts and supports the upper end of the shell to limit the position. The snap-fit structure includes a card slot provided on the inner side wall of the upper cover and a card protrusion provided on the vertical side surface of the first step.

[0012] The sealing ring is an O-shaped sealing ring.

[0013] An electrochemical gas sensor of the present utility model adopts the following technical solution: an electrochemical gas sensor, comprising a shell and an electrode and a breathable membrane arranged in the shell, the shell comprising an upper cover and a shell body, the upper cover being provided with an air inlet, and further comprising a liquid storage tank arranged between the upper cover and the shell body, the liquid storage tank opening upward and a sealing ring being provided between the liquid storage tank and the upper cover, the liquid storage tank being provided with a liquid injection port for injecting an electrolyte solution, the upper cover and the shell body being connected by a snap-fit structure so that the liquid storage tank and the upper cover can squeeze the sealing ring at the same time to achieve a seal between the two.

[0014] A step is provided on the inner wall of the liquid storage tank, a sealing ring is provided on the step surface, and an extrusion protrusion for extruding the sealing ring is provided on the inner wall of the upper cover.

[0015] A step structure is provided on the extrusion surface of the extrusion protrusion, so that the extrusion surface has a horizontal extrusion portion and an inclined extrusion portion that gradually extends inward from top to bottom.

[0016] A boss is provided on the outer peripheral wall of the liquid storage tank, and the liquid injection port is provided on the boss. The boss divides the liquid storage tank into an upper part and a lower part of the liquid storage tank. The lower part of the liquid storage tank is located inside the shell, and the upper part of the liquid storage tank is located inside the upper cover. A first arc groove is provided on the side wall of the upper cover to match the positioning of the upper part of the boss, and a second arc groove is provided on the side wall of the shell to match the positioning of the lower part of the boss.

[0017] The shell is provided with a mounting hole for installing the pin, and the outer wall of the liquid storage tank is provided with a mounting groove for installing the platinum wire connected to the pin.

[0018] A first step is provided on the outer circumferential surface of the shell, and a second step is provided on the outer circumferential surface of the liquid storage tank. The step surface of the second step contacts and supports the upper end of the shell to limit the position. The snap-fit structure includes a card slot provided on the inner side wall of the upper cover and a card protrusion provided on the vertical side surface of the first step.

[0019] The sealing ring is an O-shaped sealing ring.

[0020] The beneficial effects of the present invention include providing a separate liquid reservoir for storing electrolyte solution, and providing a sealing ring between the liquid reservoir and the upper cover to seal the electrolyte solution inside the liquid reservoir. The upper cover and the housing are connected via a snap-fit structure. During the connection process, the sealing ring between the upper cover and the liquid reservoir is squeezed to seal the electrolyte solution and prevent leakage. The housing with the above-mentioned structure of the present application is not only easy to install, but also can effectively prevent leakage of the electrolyte solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an embodiment of an electrochemical gas sensor of the present utility model;

[0022] Figure 2 yes Figure 1 Schematic diagram of the explosion structure of the electrochemical gas sensor;

[0023] Figure 3 yes Figure 2 Schematic diagram of the internal structure;

[0024] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present invention, the present invention is described in more detail below with reference to the accompanying drawings and specific embodiments. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0026] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art in the field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] An embodiment of an electrochemical gas sensor of the present utility model is as follows Figures 1-4 As shown, the device comprises a housing and electrodes and a breathable membrane disposed therein. The electrodes include a working electrode, a counter electrode, and a reference electrode. The housing comprises an upper cover 1, a liquid reservoir 5, and a housing 2. The liquid reservoir 5 is located between the upper cover 1 and the housing 2. The liquid reservoir 5 is provided with a liquid inlet 9, the upper cover is provided with an air inlet 3, and the housing is provided with a pin (not shown). The pin is connected to the electrode via a platinum wire. The electrode and breathable membrane are both disposed in the liquid reservoir. The electrodes, breathable membrane, and platinum wire are all prior art, and their structures and connections will not be described in detail in this embodiment.

[0028] The liquid reservoir 5 opens upward and a sealing ring 6 is provided between the liquid reservoir and the upper cover. In this embodiment, the sealing ring adopts an O-shaped sealing ring. Specifically, a step 7 is provided on the inner wall of the liquid reservoir 5, and the sealing ring is provided on the step surface. The inner wall of the upper cover is provided with an extrusion protrusion 17 for extruding the sealing ring. Figure 3 In this embodiment, a step structure 20 is provided on the extrusion surface of the extrusion protrusion 17, as shown in FIG. Figure 4 As shown, the extrusion surface has a horizontal extrusion portion 21 and an inclined extrusion portion 22 that extends gradually inward from top to bottom. This design makes the sealing effect better. A boss 8 is provided on the outer peripheral wall of the liquid storage tank, and the liquid injection port 9 is provided on the boss. The boss divides the liquid storage tank into an upper part 11 and a lower part 12 of the liquid storage tank. The lower part of the liquid storage tank is located inside the shell, and the upper part of the liquid storage tank is located inside the upper cover. A first arc-shaped groove 13 is provided on the side wall of the upper cover, which is aligned with the upper part of the boss, and a second arc-shaped groove 14 is provided on the side wall of the shell, which is aligned with the lower part of the boss. A mounting hole 4 for the installation of the pin is provided on the shell, and a mounting groove 10 for the installation of the platinum wire connected to the pin is provided on the outer wall of the liquid storage tank.

[0029] The upper cover and housing are connected via a snap-fit structure, allowing the liquid reservoir and upper cover to simultaneously squeeze the sealing ring to achieve a seal between them. Specifically, a first step 18 is provided on the outer circumference of the housing 2, and a second step 19 is provided on the outer circumference of the liquid reservoir. The horizontal step surface of the second step contacts the upper end of the housing for support and positioning, and the outer circumference of the large-diameter section of the upper portion of the liquid reservoir is radially aligned with the vertical side surface of the first step. The snap-fit structure includes a slot 16 provided on the inner side wall of the upper cover and a latching protrusion 15 provided on the vertical side surface of the first step. Through the snap-fit structure, the upper cover and housing are connected together, enclosing the liquid reservoir, making assembly and disassembly relatively convenient. During use, after installing and connecting the electrodes, breathable membrane, pins and platinum wire, the lower part 12 of the liquid reservoir 5 is placed in the shell. At this time, the protrusion is positioned and matched with the second arc-shaped groove 14. After placing the sealing ring, the upper cover is buckled on the top of the liquid reservoir. The first arc-shaped groove is positioned and matched to the protrusion and surrounds the protrusion together with the second arc-shaped groove. The connection between the upper cover and the shell and the sealing between the upper cover and the sealing groove are achieved through the snap-fit structure between the upper cover and the shell.

[0030] In the above description of this specification, unless otherwise expressly specified or limited, terms such as "fixed," "mounted," "connected," or "connected" should be understood broadly. For example, the term "connected" can refer to a fixed connection, a removable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal connection between two components or the interaction between two components. Therefore, unless otherwise expressly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "up", "down", "front", "back", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise", etc., which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0032] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinal numbers are used for descriptive purposes only and should not be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "plurality" means at least two, such as two, three or more, etc., unless otherwise clearly specified.

[0033] In other embodiments of the present invention, the snap-fit structure may also include a groove arranged on the vertical side surface of the first step and a latch protrusion arranged on the inner side surface of the upper cover; the sealing ring may also be selected as a sealing ring with other structures as needed, such as a "Y"-shaped sealing ring, a "V"-shaped sealing ring and other common structures.

[0034] The embodiment of the electrochemical gas sensor housing of the present invention has the same structure as the housings in the above-mentioned embodiments of the electrochemical gas sensor, and will not be described in detail here.

Claims

1. An electrochemical gas sensor housing, comprising an upper cover and a shell, wherein the upper cover is provided with an air inlet hole, characterized in that: The upper cover and the shell are connected by a snap-fit structure so that the liquid reservoir and the upper cover can squeeze the sealing ring at the same time to achieve the two ends. The seal between them.

2. The electrochemical gas sensor housing according to claim 1, wherein: A step is provided on the inner wall of the liquid storage tank, a sealing ring is provided on the step surface, and an extrusion protrusion for extruding the sealing ring is provided on the inner wall of the upper cover.

3. The electrochemical gas sensor housing according to claim 2, wherein: A step structure is provided on the extrusion surface of the extrusion protrusion, so that the extrusion surface has a horizontal extrusion portion and an inclined extrusion portion that gradually extends inward from top to bottom.

4. The electrochemical gas sensor housing according to claim 1, wherein: A boss is provided on the outer peripheral wall of the liquid storage tank, and the liquid injection port is provided on the boss. The boss divides the liquid storage tank into an upper part and a lower part of the liquid storage tank. The lower part of the liquid storage tank is located inside the shell, and the upper part of the liquid storage tank is located inside the upper cover. A first arc groove is provided on the side wall of the upper cover to match the positioning of the upper part of the boss, and a second arc groove is provided on the side wall of the shell to match the positioning of the lower part of the boss.

5. The electrochemical gas sensor housing according to claim 1, wherein: The shell is provided with a mounting hole for installing the pin, and the outer wall of the liquid storage tank is provided with a mounting groove for installing the platinum wire connected to the pin.

6. The electrochemical gas sensor housing according to any one of claims 1 to 5, characterized in that: A first step is provided on the outer circumferential surface of the shell, and a second step is provided on the outer circumferential surface of the liquid storage tank. The step surface of the second step contacts and supports the upper end of the shell to limit the position. The snap-fit structure includes a card slot provided on the inner side wall of the upper cover and a card protrusion provided on the vertical side surface of the first step.

7. The electrochemical gas sensor housing according to claim 1, wherein: The sealing ring adopts an "O"-shaped sealing ring.

8. An electrochemical gas sensor comprising a housing, electrodes disposed in the housing, and a gas permeable membrane, characterized in that: The shell adopts the electrochemical gas sensor shell according to any one of claims 1 to 6.

Images