Gas sensor testing device

Abstract

The utility model relates to the technical field of sensors, and discloses a gas sensor testing device which comprises a testing main body and a sensor, the testing device is provided with a gas channel and a measuring channel which are communicated with each other; the sensor is arranged in the measuring channel; and the size of the gas detection port of the sensor corresponds to the size of the measurement channel. The gas sensor testing device provided by the utility model can improve the accuracy of sensor inspection.

Description

Technical Field

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

[0002] Gas sensors are precision detection components with many types and categories. Different sensors are suitable for different environmental conditions. During the production process, gas sensors need to be tested and calibrated in detail to ensure that the sensors can accurately detect gases. For low-concentration gas testing, a small amount of test gas can be injected into a closed test box. The test gas is dispersed in the test box to form a certain concentration, thereby achieving accurate calibration of the sensor.

[0003] However, when it comes to sensors that detect high-concentration gases, such as oxygen sensors and carbon dioxide sensors, the above-mentioned testing methods and devices cannot achieve accurate testing and calibration. The problem is that if a high-concentration test gas atmosphere is to be formed in the test box, a larger volume of the test gas needs to be injected. The injection of additional gas in a closed test box will cause a drastic change in the air pressure inside the box, which may damage the sensor in severe cases. On the other hand, if the poor sealing of the test box causes gas leakage, the gas concentration inside the box will continue to change, resulting in inaccurate sensor testing.

[0004] Therefore, how to provide a gas sensor testing device that can improve the accuracy of sensor testing has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0005] In view of this, the utility model provides a gas sensor testing device to solve the problems in the prior art.

[0006] In a first aspect, the utility model provides a gas sensor testing device, comprising:

[0007] The test body; the test device is provided with a gas channel and a measurement channel which are interconnected;

[0008] and a sensor, wherein the sensor is arranged in the measuring channel; and the size of the gas detection port of the sensor corresponds to the size of the measuring channel.

[0009] Furthermore, the measuring channel includes a straight section and an expansion section which are connected in sequence.

[0010] Furthermore, a sealing assembly is provided on the inner wall of the measuring channel.

[0011] Furthermore, the sealing assembly includes a strip-shaped sealing gasket, which is arranged on the inner wall of the measuring channel and extends in a circumferential direction around the measuring channel.

[0012] Furthermore, the strip-shaped sealing gasket seals the gas detection port of the sensor.

[0013] Furthermore, the sealing assembly also includes a first sealing ring, a first annular groove is provided on the inner wall of the measuring channel, and the first sealing ring is arranged in the first annular groove.

[0014] Furthermore, the sealing assembly also includes a second sealing ring, the first sealing ring and the second sealing ring are arranged sequentially in the axial direction of the measuring channel, a second annular groove is provided on the inner wall of the measuring channel, and the second sealing ring is arranged in the second annular groove.

[0015] Furthermore, the measuring channel is connected to the side wall of the gas channel.

[0016] Furthermore, the number of the measuring channels is set to be multiple, and the multiple measuring channels are arranged in sequence in the extension direction of the gas channel; and a sensor is arranged in each measuring channel.

[0017] Furthermore, an inlet and an outlet are arranged on the surface of the test body, the inlet and the outlet are connected to the gas channel, and the inlet and the outlet are used to guide the gas into and out of the gas channel.

[0018] Beneficial effects: The gas testing device of the present application is small in size, has strict gas sealing, the size of the gas channel matches the size of the gas detection port of the sensor, has high gas utilization, can ensure the rapid response of the sensor, avoid the waste of standard concentration gas, and also improve the accuracy of sensor inspection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a gas sensor testing device according to an embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of a gas sensor testing device according to an embodiment of the utility model.

[0022] Description of reference numerals:

[0023] 1. Gas inlet and outlet; 2. Gas channel; 3. Measurement channel; 4. Test body; 5. Ring sealing gasket; 6. First sealing ring; 7. Second sealing ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Combine the following Figure 1 to Figure 2 , describing an embodiment of the utility model.

[0029] The present application discloses a gas sensor testing device, including a testing body 4 and a sensor; the testing device is provided with a gas channel 2 and a measuring channel 3 which are interconnected; the sensor is arranged in the measuring channel 3; and the size of the gas detection port of the sensor corresponds to the size of the measuring channel 3. The size of the gas channel 2 of the gas testing device of the present application matches the size of the gas detection port of the sensor, and the gas dispersion channel is small, which can ensure the rapid response of the sensor, avoid the waste of standard concentration gas, and improve the accuracy of sensor inspection.

[0030] The present application also discloses some embodiments, wherein the measuring channel 3 comprises a straight section and an expansion section which are connected in sequence. The gas in the gas channel 2 enters the straight section and the expansion section in sequence, the inner diameter of the straight section is equal everywhere, and the inner diameter of the expansion section gradually increases. The expansion section forms a bell mouth.

[0031] The present application also discloses some embodiments, in which a sealing component is provided on the inner wall of the measuring channel 3 to effectively prevent leakage of the standard concentration gas.

[0032] The present application also discloses some embodiments, in which the sealing assembly includes a strip sealing gasket, which is arranged on the inner wall of the measuring channel 3 and extends circumferentially around the measuring channel 3. The strip sealing gasket is enclosed on the inner wall of the measuring channel 3 to form a sealing ring, which can effectively play a sealing role and prevent gas leakage.

[0033] The present application also discloses some embodiments, wherein the strip-shaped sealing gasket seals the gas detection port of the sensor, which can effectively improve the accuracy of gas detection. The gas detection port is arranged at the gas detection port and extends circumferentially around the gas detection port to prevent inaccurate detection caused by gas leakage.

[0034] The present application also discloses some embodiments, the sealing assembly further comprises a first sealing ring 6, a first annular groove is provided on the inner wall of the measuring channel 3, and the first sealing ring 6 is arranged in the first annular groove to further improve the gas sealing effect. The cross section of the first sealing ring 6 is circular.

[0035] The present application also discloses some embodiments, the sealing assembly further includes a second sealing ring 7, the first sealing ring 6 and the second sealing ring 6 are arranged in sequence in the axial direction of the measuring channel 3, a second annular groove is provided on the inner wall of the measuring channel 3, and the second sealing ring 7 is provided in the second annular groove. The gas sealing effect is further improved. The cross section of the second sealing ring 7 is circular.

[0036] The present application also discloses some embodiments, in which the measuring channel 3 is connected to the side wall of the gas channel 2, and the gas in the gas channel 2 can enter the measuring channel 3 to ensure the measurement effect.

[0037] The present application also discloses some embodiments, in which the number of measurement channels 3 is set to be multiple, and the multiple measurement channels 3 are arranged sequentially in the extension direction of the gas channel 2; each measurement channel 3 is provided with a sensor, and multiple sensors can be measured simultaneously, further improving measurement efficiency.

[0038] The present application also discloses some embodiments, in which an inlet and an outlet are arranged on the surface of the test body 4 , the inlet and the outlet are connected to the gas channel 2 , and the inlet and the outlet are used to guide the gas into and out of the gas channel 2 .

[0039] The gas sensor test device of the present application includes a test body 4, a strip sealing gasket, a first sealing ring 6 and a second sealing ring 7; the test body 4 is provided with a gas inlet and outlet 1, a gas channel 2, and an array-arranged measuring channel 3, the gas inlet and outlet 1 is connected to the gas channel 2, the gas channel 2 is connected to the measuring channel 3, and the measuring channel 3 is connected to the sensor to be tested. The main body of the utility model device is made of engineering plastic 3D printing, or is made by mechanical processing and assembly, the sealing gasket is arranged in the measuring channel 3, and the strip sealing gasket is bonded to the test body 4 by glue. Two annular grooves are provided on the side of the measuring channel 3, and a sealing ring is installed in the annular groove.

[0040] The size of the gas channel 2 of the utility model matches the gas detection port of the sensor. The small gas channel 2 can ensure the rapid response of the sensor and avoid the waste of standard concentration gas. After the device is connected to the sensor, the sensor shape is used to compress the sealing ring and the sealing gasket to achieve triple sealing between the device and the sensor to prevent leakage of standard concentration gas. Example

[0041] like Figure 1~2 As shown, this embodiment provides a gas sensor testing device, the inner diameter of the measurement channel 3 is designed to be 20mm, and 5 sensor detection positions are arranged in an array. The sensor is connected to the measurement channel 3, the sensor detection port and the sealing gasket are pressed tightly to complete the sealing, and a 20% concentration of the gas to be tested is introduced to realize the detection and calibration of the sensor. Example

[0042] like Figure 1~2 As shown, this embodiment provides a gas sensor testing device, in which the inner diameter of the measuring channel 3 is designed to be 10 mm, 20 sensor detection positions are arranged in an array, the sensor is connected to the measuring channel 3, the sensor detection port and the sealing gasket are pressed tightly to complete the sealing, and a 5% concentration of the gas to be tested is introduced to realize the detection and calibration of the sensor.

[0043] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the attached claims. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the attached claims.

Claims

1. A gas sensor testing device, characterized in that: include: A test body (4); the test device is provided with a gas channel (2) and a measurement channel (3) which are interconnected; and a sensor, wherein the sensor is arranged in the measuring channel (3); and the size of the gas detection port of the sensor corresponds to the size of the measuring channel (3).

2. The gas sensor testing device according to claim 1, characterized in that: The measuring channel (3) comprises a straight section and an expansion section which are connected in sequence.

3. The gas sensor testing device according to claim 1 or 2, characterized in that: A sealing component is provided on the inner wall of the measuring channel (3).

4. The gas sensor testing device according to claim 3, characterized in that: The sealing assembly comprises a strip-shaped sealing gasket, which is arranged on the inner wall of the measuring channel (3) and extends in a circumferential direction around the measuring channel (3).

5. The gas sensor testing device according to claim 4, characterized in that: The strip-shaped sealing gasket seals the gas detection port of the sensor.

6. The gas sensor testing device according to claim 4 or 5, characterized in that: The sealing assembly further comprises a first sealing ring (6), a first annular groove is provided on the inner wall of the measuring channel (3), and the first sealing ring (6) is arranged in the first annular groove.

7. The gas sensor testing device according to claim 6, characterized in that: The sealing assembly further comprises a second sealing ring (7), the first sealing ring (6) and the second sealing ring (6) being arranged in sequence in the axial direction of the measuring channel (3), a second annular groove being arranged on the inner wall of the measuring channel (3), and the second sealing ring (7) being arranged in the second annular groove.

8. The gas sensor testing device according to any one of claims 1-2, 4-5, and 7, characterized in that: The measuring channel (3) is connected to the side wall of the gas channel (2).

9. The gas sensor testing device according to claim 8, characterized in that: The number of the measuring channels (3) is set to be multiple, and the multiple measuring channels (3) are arranged in sequence in the extension direction of the gas channel (2); and the sensor is arranged in each of the measuring channels (3).

10. The gas sensor testing device according to claim 7, characterized in that: An inlet and an outlet are provided on the surface of the test body (4), the inlet and the outlet are connected to the gas channel (2), and the inlet and the outlet are used to guide gas to enter and exit the gas channel (2).

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