A gas sensor response time testing fixture

Abstract

This utility model relates to a gas sensor response time testing fixture, including a fixture body. The top two sides of the fixture body have longitudinally threaded holes corresponding to the screw holes on both sides of the sensor. The top of the fixture body has a cavity corresponding to the size of the sensor's probe opening. The bottom of the fixture body has a longitudinally threaded air inlet connected to the cavity. The front end of the fixture body has a horizontally threaded air outlet, the rear end of which is connected to the cavity, and the bottom inner wall of the air outlet is slightly lower than the bottom of the cavity. Compared to existing technologies, the sensor can be fixed to the testing fixture with two bolts, making installation and positioning simple and convenient. This method is suitable for specific types of sensor devices. The cavity volume only needs to be large enough to accommodate the sensor probe opening. Using a small-volume cavity facilitates accurate measurement of the response time.

Description

Technical Field

[0001] This utility model relates to the field of sensor testing fixture technology, and in particular to a gas sensor response time testing fixture. Background Technology

[0002] The response sensitivity, response-recovery speed, and selectivity of a gas sensor to the gas being measured are key indicators for judging its quality. With the development of related fields, higher demands are being placed on the measurement accuracy, precision, and temperature and humidity stability of sensors. Therefore, to ensure product quality, it is necessary to test the performance of gas sensors after production. Chinese patent document CN202321936655.0 discloses a small-capacity, high-precision gas sensor test chamber. This application uses a tooling bracket to insert various gas sensors and sets two gas pipe connection ports on the side wall of the chamber for connecting the inlet and outlet gas pipes, thereby performing response testing within the chamber. This small-capacity test chamber can only be applied to small-sized gas sensors and is not suitable for the installation and positioning of large-sized sensor devices. Furthermore, its complex size and structure make it inconvenient for machining. Utility Model Content

[0003] To address the aforementioned problems, this utility model discloses a gas sensor response time testing fixture, which is suitable for the installation and positioning of large-size sensors and is easy to process and form.

[0004] The specific technical solution is as follows:

[0005] A gas sensor response time testing fixture includes a fixture body. The top two sides of the fixture body are longitudinally perforated with threaded holes corresponding to the screw holes on both sides of the sensor. The top of the fixture body has a cavity corresponding to the size of the sensor detection tube opening. The bottom of the fixture body has a longitudinally perforated air inlet connected to the cavity. The front end of the fixture body has a horizontally perforated air outlet. The rear end of the air outlet is connected to the cavity, and the inner wall of the bottom end of the air outlet is slightly lower than the bottom end of the cavity. The rear end of the air outlet extends to the top end of the air inlet.

[0006] Preferably, the tooling body has a cuboid structure.

[0007] Preferably, the cavity has a cylindrical cavity structure and is located at the top center of the tooling body.

[0008] Preferably, the air inlet is circular and located at the center of the cavity.

[0009] Preferably, the diameter of the air inlet is smaller than the diameter of the cavity.

[0010] Preferably, the top edge of the cavity is flared.

[0011] The beneficial effects of this utility model are reflected in:

[0012] (1) Compared with the prior art, the test fixture of this utility model has a cuboid structure, which is convenient for machining; the sensor can be fixed on the test fixture by two bolts, and the threaded hole extends to the bottom of the test fixture, which facilitates the connection between the fixture and the air intake device. The installation and positioning method is simple and convenient, and it is suitable for specific types of sensor devices.

[0013] (2) The cylindrical cavity inside the tool body is connected to the air inlet and air outlet. The cavity volume should be large enough to accommodate the sensor probe. A small cavity volume is used to facilitate accurate measurement of response time and avoid the cavity being too large, which would lead to an overestimation of the test results. Attached Figure Description

[0014] Figure 1 This is a perspective view of the tooling body in this utility model when the sensor is installed.

[0015] Figure 2 This is a front view of the tooling body with the sensor installed in this utility model.

[0016] Figure 3 This is a perspective view of the tooling body in this utility model.

[0017] Figure 4 This is the front view of the tooling body in this utility model.

[0018] Figure 5 This is a top view of the tooling body in this utility model.

[0019] Figure 6 for Figure 5 AA-direction sectional view

[0020] Figure 7 for Figure 5 Sectional view along the BB direction.

[0021] Explanation of reference numerals in the attached drawings: Tooling body 1, threaded hole 101, cavity 102, air inlet 103, air outlet 104, sensor 2, ear 21, detection tube 22, fixing bolt 3. Detailed Implementation

[0022] To make the technical solution of this utility model clearer and more explicit, the utility model will be further described below with reference to the accompanying drawings. Any solution derived by equivalent substitution and conventional reasoning of the technical features of this utility model falls within the protection scope of this utility model. The fixed connections and fixed settings mentioned in this utility model are all common connection methods in the mechanical field, including welding, bolt and nut connections, and screw connections.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Please see the appendix Figure 1-7 This embodiment provides a gas sensor response time testing fixture. This fixture is used to fix the sensor 2 and connect the inlet pipe and provide an outlet 104 during gas sensor response time testing. The testing fixture includes a fixture body 1, which is a cuboid structure. Threaded holes 101, corresponding to the screw holes on both sides of the top of the fixture body, are longitudinally penetrating the top, allowing the sensor to be screwed into the threaded holes 101 by two fixing bolts 3, thereby achieving the positioning of the sensor 2. A cavity 102, corresponding to the size of the sensor detection port 22, is provided at the top of the fixture body 1. This cavity 102 is cylindrical and located at the center of the top of the fixture body 1. The volume of this cavity 102 is as small as possible, just enough to accommodate the sensor 2 detection port, and a gap is left between the sensor detection port 22 and the inner wall of the bottom of the cavity after docking.

[0025] The tooling body 1 has a longitudinally opened air inlet 103 at the bottom, which is connected to the cavity 102. The air inlet 103 is used to connect to the air inlet pipe of the air inlet device. The tooling body 1 has a horizontally opened air outlet 104 at the front end. The rear end of the air outlet 104 is connected to the cavity 102, and the bottom end of the inner wall of the air outlet 104 is slightly lower than the bottom end of the cavity 102. The rear end of the air outlet 104 extends to the top end of the air inlet 103.

[0026] In this embodiment, the air inlet 103 is circular and located at the center of the cavity 102, and the diameter of the air inlet 103 is smaller than the diameter of the cavity 102.

[0027] In this embodiment, the top edge of the cavity 102 is flared to facilitate docking with the sensor detection port 22.

[0028] In use, first use the threaded holes 101 on both sides of the working body to engage with the connecting bolts from bottom to top to screw them in, so that the test fixture can be fixed on the air intake device; then, when installing the positioning gas sensor 2, align the sensor probe port 22 with the cavity 102, and align the threaded holes on the ears 21 on both sides of the sensor 2 with the threaded holes 101, and then use two fixing bolts 3 to pass through from top to bottom and screw them into the threaded holes 101 to fix the sensor.

[0029] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A gas sensor response time test fixture characterized by, The fixture includes a tooling body (1), on the top two sides of the tooling body, there are threaded holes (101) that are longitudinally connected to the positions of the screw holes on both sides of the sensor. The top of the tooling body (1) has a cavity (102) that is corresponding to the size of the sensor detection port (22). The bottom of the tooling body (1) has an air inlet (103) that is connected to the cavity (102) and the front end of the tooling body (1) has a horizontal air outlet (104). The rear end of the air outlet (104) is connected to the cavity (102), and the bottom inner wall of the air outlet (104) is slightly lower than the bottom end of the cavity (102). The rear end of the air outlet (104) extends to the top of the air inlet (103).

2. The gas sensor response time test fixture of claim 1, wherein, The tooling body (1) has a rectangular parallelepiped structure.

3. The gas sensor response time test fixture of claim 1, wherein, The cavity (102) has a cylindrical cavity (102) structure and is located at the top center of the tooling body (1).

4. The gas sensor response time test fixture of claim 3, wherein, The air inlet (103) is circular and located at the center of the cavity (102).

5. A gas sensor response time test fixture as claimed in claim 4, wherein, The diameter of the air inlet (103) is smaller than the diameter of the cavity (102).

6. The response time test fixture for a gas sensor of claim 3, wherein, The top edge of the cavity (102) is flared.

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