A sensor production detection device

Abstract

The application discloses a kind of detection devices for sensor production, belong to sensor technical field, including detection cavity, with the air inlet pipe of detection cavity connection, detection cavity is discoid, the inside of detection cavity is coaxially installed with multiple groups annular retaining wall, the diameter of annular retaining wall gradually decreases along the radial direction of detection cavity, annular mixing cavity is formed between adjacent two annular retaining walls, the inside of annular retaining wall located in the innermost layer of detection cavity forms center mixing cavity, sensor is installed in center mixing cavity;Air inlet pipe extends inwards along the radial direction of detection cavity, air inlet pipe is supported by side retaining wall, retaining wall support simultaneously seals each annular mixing cavity apart, the outer end of air inlet pipe is connected with the medium to be detected medium conveying pipeline, the inner end of air inlet pipe is connected with center mixing cavity, a plurality of gas outlets are formed in the sidewall of air inlet pipe, switch valve is installed in gas outlet, gas outlet and annular mixing cavity one to one corresponding.The application can make medium be fully mixed before detection, to improve the accuracy of detection result.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, and specifically relates to a testing device for sensor production. Background Technology

[0002] In the field of humidity sensor production and testing, existing testing devices typically employ static testing methods. During testing, the humidity sensor under test is placed on a fixed frame, and a standard gas with a known humidity is introduced into the cavity through an air inlet pipe. After the sensor's response stabilizes, its output value is read and compared with the standard value to determine whether the product is qualified. Existing air inlet pipes are usually directly connected to the cavity interior. Humidifying or drying gas is injected into the cavity at a high flow rate from the inlet, forming a distinct directional airflow within the cavity. Because the gas is not sufficiently mixed and diffused before entering the cavity, there are significant differences in humidity distribution in different areas within the cavity. The humidity near the inlet quickly reaches the target value, while areas far from the inlet show a significant humidity lag. This spatial humidity non-uniformity means that sensors installed in different locations are in different testing environments. Even sensors from the same batch with identical performance can produce different test results depending on their fixed location. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a detection device for sensor production that allows the medium to be fully mixed before detection, thereby improving the accuracy of the detection results.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a testing device for sensor production, comprising a testing chamber and an air inlet pipe connected to the testing chamber. The testing chamber is disc-shaped, and multiple sets of annular baffles are coaxially installed on the inner side of the testing chamber. The diameter of the annular baffles gradually decreases along the radial direction of the testing chamber, and an annular mixing chamber is formed between two adjacent annular baffles. A central mixing chamber is formed on the inner side of the innermost annular baffle in the testing chamber, and a sensor is installed in the central mixing chamber. The air inlet pipe extends radially inward along the testing chamber and is supported by side baffles. The baffles support and seal each annular mixing chamber. The outer end of the air inlet pipe is connected to a pipeline for conveying the medium to be tested, and the inner end of the air inlet pipe is connected to the central mixing chamber. Multiple air outlets are provided on the side wall of the air inlet pipe, and a switch valve is installed in each air outlet. Each air outlet corresponds to an annular mixing chamber, and the orientation of two adjacent air outlets is opposite. Through holes corresponding to each air outlet are provided on the annular baffles, and one-way valves are installed in each through hole. The through holes and their corresponding air outlets are arranged on both sides of the side baffles.

[0005] Furthermore, the innermost annular retaining wall includes a vertically assembled upper retaining wall and a lower retaining wall. The upper end of the upper retaining wall is fixed to the detection chamber, and the lower retaining wall is rotatably installed inside the detection chamber. The upper end of the lower retaining wall and the lower end of the upper retaining wall are rotatably sealed together. A stop block is fixed to the outer side of the lower retaining wall. The side of the stop block is sealed together with the upper retaining wall and the outer annular retaining wall. A through hole is opened on the innermost annular retaining wall and is located on the lower retaining wall. The through hole is adjacent to the stop block and is located between the stop block and the side retaining wall.

[0006] Furthermore, an internal gear ring is installed on the lower inner side of the lower retaining wall. The internal gear ring is meshed with a gear, which is connected to a rotating shaft. The rotating shaft passes through the detection chamber and is connected to a first motor, which is fixed at the bottom of the detection chamber.

[0007] Furthermore, a support mesh is coaxially mounted on the inner side of the central mixing chamber. The support mesh is cylindrical, and the sensor is installed at the center of the support mesh.

[0008] Furthermore, the support net is rotatably installed inside the central mixing chamber, and spiral blades are installed on the outer side of the support net. The support net is connected to a second motor, which is fixed to the bottom of the detection chamber.

[0009] Furthermore, an annular channel is provided on the inner side of the upper retaining wall, and a vertical channel communicating with the annular channel is provided on the upper side of the upper retaining wall. A resistance wire is installed in the annular channel, and the resistance wire is arranged in a ring on the inner side of the upper retaining wall. The upper end of the resistance wire passes through the vertical channel and is connected to the controller.

[0010] Furthermore, a pressure balancing tube is installed inside the detection chamber. The pressure balancing tube extends inward along the axial direction of the detection chamber. The outer end of the pressure balancing tube is connected to an air pump, and the inner end of the pressure balancing tube is connected to the central mixing chamber.

[0011] Furthermore, the outer end of the air intake pipe is connected to the medium delivery pipeline to be tested via a T-connector, which is also connected to a cleaning pipeline.

[0012] The beneficial effects of this invention are as follows: The present invention discloses a testing device for sensor production. Before the medium to be tested is tested, it needs to flow through each layer of annular mixing chambers to reach the sensor in sequence. This allows the medium to be fully mixed before testing, thereby improving the accuracy of the test results. Attached Figure Description

[0013] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3This is a structural diagram of the upper and lower retaining walls; Figure 4 This is a schematic diagram of the block's structure; Figure 5 This is a schematic diagram of the structure of a ring channel.

[0014] The following are the markings in the attached diagram: Detection chamber 1, air inlet pipe 2, annular baffle wall 3, annular mixing chamber 4, central mixing chamber 5, sensor 6, side baffle wall 7, air outlet 8, through hole 9, upper baffle wall 10, lower baffle wall 11, stop block 12, internal gear ring 13, gear 14, rotating shaft 15, first motor 16, support net 17, annular channel 18, vertical channel 19, resistance wire 20, air pressure balance pipe 21, tee pipe 22. Detailed Implementation

[0015] like Figures 1-5 As shown, the present invention discloses a testing device for sensor 6 production, including a testing chamber 1 and an air inlet pipe 2 connected to the testing chamber 1. The testing chamber 1 is disc-shaped, and multiple sets of annular baffles 3 are coaxially installed on the inner side of the testing chamber 1. The outer layer of the testing chamber 1 is sealed by an annular baffle 3, and the upper and lower top plates seal both ends of the testing chamber 1. Before testing, the entire testing chamber 1 can be placed in the testing environment, and the medium to be tested can be introduced through the air inlet pipe 2 for testing.

[0016] In this embodiment of the invention, the diameter of the annular baffle 3 gradually decreases along the radial direction of the detection cavity 1. The outermost annular baffle 3 does not have a through hole 9. An annular mixing cavity 4 is formed between two adjacent annular baffles 3. A central mixing cavity 5 is formed inside the innermost annular baffle 3 of the detection cavity 1. A sensor 6 is installed in the central mixing cavity 5. The sensor 6 can be a conventional humidity sensor. The medium to be tested is fully mixed before it meets the sensor 6, thereby improving the accuracy of the detection results.

[0017] Specifically, the air inlet pipe 2 extends radially inward along the detection chamber 1. The air inlet pipe 2 is supported by the side baffle 7. The baffle supports and seals the annular mixing chambers 4, allowing the gas in the annular mixing chambers 4 to flow and mix in an orderly manner. The outer end of the air inlet pipe 2 is connected to the test medium conveying pipeline, and the test medium is conveyed to the inside of the detection chamber 1 through the test medium conveying pipeline.

[0018] The inner end of the air inlet pipe 2 is connected to the central mixing chamber 5. Multiple air outlets 8 are provided on the side wall of the air inlet pipe 2. During normal transport of the medium to be tested, the inner end of the air inlet pipe 2 is closed. When the air outlets 8 are closed, the medium to be tested can be directly transported through the inner end of the air inlet pipe 2. A switch valve is installed inside each air outlet 8. Each air outlet 8 corresponds one-to-one with an annular mixing chamber 4, and adjacent air outlets 8 face opposite directions. A through-hole 9, corresponding one-to-one with each air outlet 8, is provided on the annular baffle wall 3. A one-way valve is installed inside each through-hole 9. The through-holes 9 and their corresponding air outlets 8 are located on both sides of the side baffle wall 7.

[0019] The working principle and process of the device of the present invention are as follows: When there is sufficient test medium in the environment, the outermost vent 8 can be opened, while all other vents 8 and the air supply port at the inner end of the air inlet pipe 2 are closed. The gas supplied from the vent 8 passes through each annular mixing chamber 4 sequentially before reaching the central mixing chamber 5. The test medium then flows through each annular mixing chamber 4 before reaching the sensor 6, ensuring thorough mixing before detection and thus improving the accuracy of the detection results. If there is little test medium in the environment, it is not necessary to introduce too much test medium; in this case, opening the rearmost vent 8 is sufficient. If very little test medium is required, all vents 8 should be closed, and the air supply port at the inner end of the air inlet pipe 2 should be opened to directly introduce the test medium into the central mixing chamber 5. This not only improves efficiency but also enhances the accuracy of the sensor 6's detection results.

[0020] In this embodiment, the innermost annular retaining wall 3 includes a vertically assembled upper retaining wall 10 and a lower retaining wall 11. Both the upper retaining wall 10 and the lower retaining wall 11 are cylindrical structures. The upper end of the upper retaining wall 10 is fixed to the detection cavity 1, and the lower retaining wall 11 is rotatably installed in the detection cavity 1. The upper end of the lower retaining wall 11 is rotatably sealed with the lower end of the upper retaining wall 10. Specifically, the lower end of the upper retaining wall 10 is integrally provided with an annular protrusion, and the upper end of the lower retaining wall 11 is provided with an annular groove that matches it. The annular groove and the annular protrusion can be sealed by an annular sealing ring.

[0021] Furthermore, a stop block 12 is fixed to the outer side of the lower baffle wall 11. The side of the stop block 12 is sealed to the upper baffle wall 10 and the outer annular baffle wall 3. A through hole 9 is provided on the lower baffle wall 11, adjacent to the stop block 12 and located between the stop block 12 and the side baffle wall 7. By rotating the lower baffle wall 11, the position of the stop block 12 can be changed, thereby adjusting the size of the innermost annular mixing chamber 4 to adapt to the needs of different test media capacities, thus providing a finer adjustment effect.

[0022] In this embodiment, an internal gear ring 13 is installed on the lower inner side of the lower baffle wall 11. The internal gear ring 13 is meshed with a gear 14, which is connected to a rotating shaft 15. The rotating shaft 15 passes through the detection cavity 1 and is connected to a first motor 16, which is fixed to the bottom of the detection cavity 1. The rotation angle of the lower baffle wall 11 can be easily adjusted by the first motor 16.

[0023] In this embodiment, a support net 17 is coaxially installed on the inner side of the central mixing chamber 5. The support net 17 is cylindrical, and the sensor 6 is installed in the center of the support net 17. The support net 17 can support the sensor 6 without hindering the flow of gas, and can also protect the sensor 6.

[0024] In this embodiment, the support net 17 is rotatably installed in the central mixing chamber 5. A spiral blade is installed on the outer side of the support net 17. The support net 17 is connected to a second motor, which is fixed at the bottom of the detection chamber 1. By rotating the spiral blade, the flow effect of the gas in the central mixing chamber 5 can be improved.

[0025] In this embodiment, an annular channel 18 is provided on the inner side of the upper baffle wall 10, and a vertical channel 19 communicating with the annular channel 18 is provided on the upper side of the upper baffle wall 10. A resistance wire 20 is installed in the annular channel 18. The resistance wire 20 is arranged in a ring on the inner side of the upper baffle wall 10. The upper end of the resistance wire 20 passes through the vertical channel 19 and is connected to the controller. Through the resistance wire 20, the gas temperature in the central mixing chamber 5 can be adjusted to avoid the influence of sudden temperature changes on humidity.

[0026] In this embodiment, a pressure balancing tube 21 is installed inside the detection chamber 1. The pressure balancing tube 21 extends inward along the axial direction of the detection chamber 1. The outer end of the pressure balancing tube 21 is connected to an air pump, and the inner end of the pressure balancing tube 21 is connected to the central mixing chamber 5. This can achieve gas pressure balance and ensure the accuracy of the detection results.

[0027] In this embodiment, the outer end of the air inlet pipe 2 is connected to the medium to be tested conveying pipeline through a three-way pipe 22, and the three-way pipe 22 is also connected to a cleaning pipeline.

Claims

1. A testing device for sensor manufacturing, characterized in that: The device includes a detection chamber and an air inlet pipe connected to the detection chamber. The detection chamber is disc-shaped, and multiple sets of annular baffles are coaxially installed on the inner side of the detection chamber. The diameter of the annular baffles gradually decreases along the radial direction of the detection chamber. An annular mixing chamber is formed between two adjacent annular baffles. A central mixing chamber is formed on the inner side of the innermost annular baffle in the detection chamber, and a sensor is installed in the central mixing chamber. The air inlet pipe extends radially inward along the detection chamber and is supported by side baffles. The baffles support and seal each annular mixing chamber. The outer end of the air inlet pipe is connected to the pipeline for conveying the medium to be tested, and the inner end of the air inlet pipe is connected to the central mixing chamber. Multiple air outlets are opened on the side wall of the air inlet pipe, and a switch valve is installed in each air outlet. Each air outlet corresponds to an annular mixing chamber, and the orientation of two adjacent air outlets is opposite. Through holes corresponding to each air outlet are opened on the annular baffles, and one-way valves are installed in each through hole. The through holes and their corresponding air outlets are arranged on both sides of the side baffles.

2. The detection device for sensor production according to claim 1, characterized in that: The innermost annular retaining wall includes a vertically assembled upper retaining wall and a lower retaining wall. The upper end of the upper retaining wall is fixed to the detection chamber, and the lower retaining wall is rotatably installed inside the detection chamber. The upper end of the lower retaining wall and the lower end of the upper retaining wall are rotatably sealed together. A stop block is fixed to the outside of the lower retaining wall. The side of the stop block is sealed together with the upper retaining wall and the outer annular retaining wall. A through hole is opened in the innermost annular retaining wall and is located on the lower retaining wall. The through hole is adjacent to the stop block and is located between the stop block and the side retaining wall.

3. The detection device for sensor production according to claim 2, characterized in that: An internal gear ring is installed on the lower inner side of the lower retaining wall. The internal gear ring is meshed with a gear, which is connected to a rotating shaft. The rotating shaft passes through the detection chamber and is connected to a first motor. The first motor is fixed at the bottom of the detection chamber.

4. The detection device for sensor production according to claim 3, characterized in that: A support mesh is coaxially mounted on the inner side of the central mixing chamber. The support mesh is cylindrical, and the sensor is installed in the center of the support mesh.

5. The testing device for sensor production according to claim 4, characterized in that: The support net is rotatably installed inside the central mixing chamber. Spiral blades are installed on the outer side of the support net. The support net is connected to a second motor, which is fixed to the bottom of the detection chamber.

6. The detection device for sensor production according to claim 5, characterized in that: An annular channel is provided on the inner side of the upper retaining wall, and a vertical channel communicating with the annular channel is provided on the upper side of the upper retaining wall. A resistance wire is installed in the annular channel. The resistance wire is arranged in a ring on the inner side of the upper retaining wall, and the upper end of the resistance wire passes through the vertical channel and is connected to the controller.

7. A testing device for sensor production according to any one of claims 1-6, characterized in that: An air pressure balance tube is installed inside the detection chamber. The air pressure balance tube extends inward along the axial direction of the detection chamber. The outer end of the air pressure balance tube is connected to the air pump, and the inner end of the air pressure balance tube is connected to the central mixing chamber.

8. The detection device for sensor production according to claim 6, characterized in that: The outer end of the air inlet pipe is connected to the medium delivery pipeline to be tested via a T-connector, which is also connected to a cleaning pipeline.

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