CN219223794U

CN219223794U - Testing device of gas-humidity sensor for simulating environmental parameters

Info

Publication number: CN219223794U
Application number: CN202223379658.7U
Authority: CN
Inventors: 李盈; 高炬; 赵蒙
Original assignee: Suzhou University of Science and Technology
Current assignee: Suzhou University of Science and Technology
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-06-20
Anticipated expiration: 2032-12-16

Abstract

The utility model discloses a testing device of a gas-humidity sensor for simulating environmental parameters, which comprises a cavity, wherein the upper end of the cavity is provided with a flange plate, the middle part of the end surface of the flange plate, which is far away from the cavity, is provided with an aviation plug, a plurality of electromagnetic valves are symmetrically arranged around the aviation plug which is taken as an axis, the other two ends of the aviation plug, which are far away from the plurality of electromagnetic valves, are respectively symmetrically provided with a chuck, the flange plate is close to the middle part of the lower end of the cavity, one side of the bottom of the aviation plug is provided with a temperature-humidity air pressure sensor, and the lower end of one chuck is provided with a heating device. The utility model has the beneficial effects that: and adjusting the flow rate, the opening and closing time of the electromagnetic valve and the pump and the injection quantity of the microsyringe according to the acquired data of the BOSCH BME280 combined temperature and humidity air pressure sensor, realizing the adjustment of the environmental air pressure and the adjustment of the relative humidity in the test cavity, and adjusting the environmental temperature in the test cavity by adopting a temperature test box.

Description

Testing device of gas-humidity sensor for simulating environmental parameters

Technical Field

The utility model relates to the technical field of gas sensor testing devices, in particular to a testing device of a gas-humidity sensor simulating environmental parameters.

Background

In recent 40 years, the development of gas sensors is in an increasing period and an explosion period, and the gas sensors are widely applied to the fields of aerospace, human body exhaled breath detection, air quality monitoring and the like. The morphology and structure of the gas sensitive material are the main factors affecting the gas sensitive performance, but some environmental factors also affect the response signal of the gas sensor, including changes in temperature, relative humidity and air pressure. At present, the gas sensor testing system mainly measures performance indexes such as sensitivity, response speed, selectivity and the like of a gas sensor by preparing standard gas, the function is single, and the testing system with complete functions is huge in size and high in price. The preparation of the standard gas of the volatile organic compound VOCs (Volatile Organic Compounds) generally adopts a diffusion tube method, the dynamic gas distribution device has high price, and the preparation process of the standard gas of the VOCs is complex.

Disclosure of Invention

The utility model aims to provide a testing device for a gas-humidity sensor simulating environmental parameters, so as to solve the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a testing arrangement of atmospheric pressure sensor of simulation environmental parameter, includes the cavity, the cavity upper end is equipped with the ring flange, the ring flange is kept away from the terminal surface middle part of cavity is equipped with aviation plug, with aviation plug is the symmetry respectively is equipped with a plurality of solenoid valves all around as the axle center, aviation plug keeps away from a plurality of the other both ends of solenoid valve are symmetry respectively and are equipped with the chuck, the ring flange is close to the lower extreme middle part of cavity, and be located aviation plug bottom one side is equipped with temperature and humidity air pressure sensor, and one of them the lower extreme of chuck is equipped with heating device.

Further preferably, the upper end of the chuck is provided with a first O-shaped ring, a blind plate and a second clamp in sequence.

Further preferably, the lower ends of the electromagnetic valves are respectively provided with a mounting bracket which is connected with the electromagnetic valves and fixedly arranged at the lower end of the flange plate.

Further preferably, the heating device comprises a heating block arranged at the lower end of the flange plate, a fan is arranged on one side of the heating block, a heating rod of an integrated thermocouple is arranged at the top of the heating block, the heating block is of an inverted T-shaped structure, and one end of the heating block, which is far away from the heating rod of the integrated thermocouple, is fixedly connected with a mounting frame arranged at the lower end of the flange plate.

Further preferably, an air inlet pipe is arranged on one side of the temperature and humidity air pressure sensor.

Further preferably, the upper end of the cavity is provided with a groove, a second O-shaped ring is arranged in the groove, a first clamping hoop is arranged on the outer side of the upper end of the cavity and the outer side of the flange plate, the cavity is a quartz cavity, fixing rings used for fixing are arranged at the upper end and the lower end of the cavity, and a plurality of supporting rods are arranged between the fixing rings.

Advantageous effects

According to the testing device for the air-humidity sensor simulating the environmental parameters, provided by the utility model, labVIEW is used as a software development platform, automatic control software with different functions is developed, the flow rate, the solenoid valve, the pump opening and closing time and the injection quantity of the microsyringes are adjusted according to the acquired data of the BOSCH BME280 combined type temperature-humidity air pressure sensor, the air pressure adjustment and the relative humidity adjustment of the environment in the testing cavity are realized, and the temperature of the environment in the testing cavity is adjusted by adopting a temperature test box.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of the bottom view of the flange plate of the present utility model;

fig. 3 is a schematic structural view of a flange plate according to the present utility model.

Reference numerals

The device comprises a first clamping band, a second clamping band, a 2-blind plate, a 3-first O-shaped ring, a 4-chuck, a 5-aviation plug, a 6-electromagnetic valve, a 7-flange, an 8-mounting bracket, a 9-temperature and humidity air pressure sensor, a 10-heating block, a 11-fan, a 12-thermocouple-integrated heating rod, a 13-air inlet pipe, a 14-first clamping band, a 15-second O-shaped ring, a 16-cavity, a 17-fixing ring, a 18-supporting rod and a 19-mounting bracket.

Detailed Description

The following are specific embodiments of the present utility model and the technical solutions of the present utility model will be further described with reference to the accompanying drawings, but the present utility model is not limited to these embodiments.

Examples

As shown in fig. 1-3, a testing device for a gas-humidity sensor simulating environmental parameters comprises a cavity 16, wherein a flange 7 is arranged at the upper end of the cavity 16, an aviation plug 5 is arranged in the middle of the end surface of the flange 7 away from the cavity 16, a plurality of electromagnetic valves 6 are symmetrically arranged around the aviation plug 5 serving as an axis, chucks 4 are symmetrically arranged at the other two ends of the aviation plug 5 away from the electromagnetic valves 6 respectively, the flange 7 is close to the middle of the lower end of the cavity 16, a temperature-humidity air pressure sensor 9 is arranged at one side of the bottom of the aviation plug 5, and a heating device is arranged at the lower end of one of the chucks 4.

In this embodiment, the upper end of the chuck 4 is provided with a first O-ring 3, a blind plate 2 and a second clip 1 in order.

The lower ends of the electromagnetic valves 6 are respectively provided with a mounting bracket 8 which is connected with the electromagnetic valves and fixedly arranged at the lower end of the flange 7.

The heating device comprises a heating block 10 arranged at the lower end of the flange plate 7, a fan 11 is arranged on one side of the heating block 10, a heating rod 12 of an integrated thermocouple is arranged at the top of the heating block 10, the heating block 10 is of an inverted T-shaped structure, one end of the heating block 10, which is far away from the heating rod 12 of the integrated thermocouple, is fixedly connected with a mounting frame 19 arranged at the lower end of the flange plate 7, and the heating block and a chuck 4 of the fan are used for injecting water or VOC.

An air inlet pipe 13 is arranged on one side of the temperature and humidity air pressure sensor 9.

The upper end of the cavity 16 is provided with a groove, a second O-shaped ring 15 is arranged in the groove, a first clamping hoop 14 is arranged on the outer side of the upper end of the cavity 16 and the outer side of the flange 7, the cavity 16 is a quartz cavity, fixing rings 17 used for fixing are arranged at the upper end and the lower end of the cavity 16, and a plurality of supporting rods 18 are arranged between the two fixing rings 17.

The device is used for testing a gas sensor, preparing a VOCs standard gas and testing a humidity sensor, wherein the gas sensor test comprises sensor performance index test and influence of environmental parameters, temperature, relative humidity and air pressure on sensor response signals; the VOCs standard gas is prepared by adopting a pure solvent, and the preparation method is simple and convenient; humidity sensor testing investigated the response of humidity sensors at different relative humidities.

The testing cavity is divided into a vacuum cavity and a vacuum flange, and polishing treatment is carried out on the inner wall of the cavity and the vacuum side of the flange so as to reduce the adsorption of the gas surface, and the cavity and the flange are sealed in a mode of combining an O-shaped fluororubber sealing ring with a vacuum clamp.

As shown in fig. 3, the atmospheric side of the vacuum flange is provided with four stainless steel air pipe interfaces with the thickness of 6.35mm, two vacuum chuck interfaces and aviation plug interfaces, wherein three stainless steel air pipe interfaces are provided with vacuum two-way normally-closed electromagnetic valves respectively used for air intake, air exhaust and vacuum pump air exhaust, a stainless steel pipe used for air intake stretches out of the flange vacuum side by 25mm to better realize the gas circulation in the cavity of the test cavity, the other air pipe interfaces are provided with blind plugs for standby, and the electromagnetic valves, the blind plugs and the stainless steel pipe are sealed by cutting sleeves;

the vacuum chuck and the blind plate are sealed by adopting an O-shaped ring and a vacuum clamp;

as shown in fig. 2, a chuck with a fan and a heating block under the vacuum side is used for injecting water and liquid VOCs, and the other is used for standby; the aviation plug is used for testing power supply and signal transmission of components in the cavity, and shielding wires are adopted for the transmission lines in the cavity and cables from the aviation plug to the control cabinet. The flange vacuum side is provided with a temperature and humidity air pressure sensor, a heating block mounting bracket and a to-be-measured sensor signal acquisition and modulation circuit board mounting bracket, and batch test is carried out by means of a circuit board of a multi-sensor base. The sensor is used for monitoring the environmental temperature, relative humidity and air pressure in the test cavity, and the measuring range and the measuring precision are respectively: -40-80 ℃ +/-0.5 ℃, 0-100%RH+/-3%RH and 0.3 bar+/-1.1 bar+/-0.0006 bar.

Sensor test chamber temperature regulation: the cavity has the advantage of small volume, and can be placed in a high-low temperature box, and the temperature in the sensor testing cavity can be regulated through the high-low temperature box;

the specific steps of relative humidity adjustment in the sensor testing cavity are as follows:

(1) Firstly, connecting an air outlet interface of an air distribution module to an air inlet interface of a sensor testing module;

(2) Heating the heating block to 80 ℃, introducing dry clean air, and stopping introducing when the BME280 sensor detects that the relative humidity in the sensor test cavity is lower than 3%;

(3) Opening the clamp and the blind plate, injecting water with corresponding capacity by using a microsyringe according to the target relative humidity, and evaporating the water into water vapor when the water passes through the heating block;

(4) Setting the temperature of the heating block to be room temperature after the relative humidity rises and is stably slightly higher than the target value;

(5) And opening a vacuum pump to remove the excessive humidity.

Table 1 relative humidity versus water injection capacity correspondence:

table 2 relative humidity versus water injection capacity correspondence:

and (3) air pressure control: the dynamic test of the sensor under different pressures can be realized by adopting a method of combining a clamping sleeve needle valve and a vacuum pump; and the device introduces vacuum technology to realize static test of the sensor under different air pressures, and research the influence of different air pressures on the gas sensor.

The adopted clamping sleeve needle valve can rotate eleven circles, twenty-five scales are formed in each circle, under dynamic test, the clamping sleeve needle valve is connected to the upstream of the electromagnetic valve at the air inlet of the sensor test module, the micro vacuum pump is connected to the downstream of the electromagnetic valve at the air extraction opening, the needle valve is rotated to corresponding scales according to target pressure before test, the corresponding relation is shown in table 2, the needle valve scales are marked by the number of circles and the scales, then the electromagnetic valve at the air inlet and the air extraction opening is opened, and target gas is introduced and the vacuum pump is opened.

The sensor feeds back the air pressure in the test cavity so as to determine the opening and closing of the electromagnetic valve at the upstream of the vacuum pump, and if the pressure is higher than the target air pressure, the electromagnetic valve is opened, otherwise, the electromagnetic valve is closed, and the air pressure in the sensor test cavity fluctuates around the target air pressure;

under static test, the electromagnetic valve and the vacuum pump at the upstream of the vacuum pump are opened, and the electromagnetic valve and the vacuum pump are closed after the air pressure in the cavity reaches the target air pressure.

Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the summary of the present utility model within the scope of the present utility model.

Claims

1. The utility model provides a testing arrangement of atmospheric humidity sensor of simulation environmental parameter which characterized in that: including cavity (16), cavity (16) upper end is equipped with ring flange (7), ring flange (7) are kept away from the terminal surface middle part of cavity (16) is equipped with aviation plug (5), use aviation plug (5) are equipped with a plurality of solenoid valves (6) as the symmetry all around of axle center respectively, aviation plug (5) keep away from a plurality of solenoid valve (6) are equipped with chuck (4) in other both ends symmetry respectively, ring flange (7) are close to the lower extreme middle part of cavity (16), and are located aviation plug (5) bottom one side is equipped with temperature and humidity sensor (9), and one of them chuck (4) lower extreme is equipped with heating device.

2. The test device for a gas-humidity sensor simulating environmental parameters of claim 1, wherein: the upper end of the chuck (4) is sequentially provided with a first O-shaped ring (3), a blind plate (2) and a second clamp (1).

3. The test device for a gas-humidity sensor simulating environmental parameters of claim 1, wherein: the lower ends of the electromagnetic valves (6) are respectively provided with a mounting bracket (8) which is connected with the electromagnetic valves and fixedly arranged at the lower end of the flange plate (7).

4. The test device for a gas-humidity sensor simulating environmental parameters of claim 1, wherein: heating device including set up in heating piece (10) of ring flange (7) lower extreme, just heating piece (10) one side is equipped with fan (11), heating piece (10) top is equipped with heating rod (12) of integrated thermocouple, heating piece (10) are the T style of calligraphy structure of inversion, heating piece (10) keep away from one end of heating rod (12) of integrated thermocouple with mounting bracket (19) fixed connection that ring flange (7) lower extreme set up.

5. The test device for a gas-humidity sensor simulating environmental parameters of claim 1, wherein: an air inlet pipe (13) is arranged on one side of the temperature and humidity air pressure sensor (9).

6. The test device for a gas-humidity sensor simulating environmental parameters of claim 1, wherein: the novel stainless steel tube is characterized in that the upper end of the cavity (16) is provided with a groove, a second O-shaped ring (15) is arranged in the groove, a first clamping hoop (14) is arranged outside the upper end of the cavity (16) and outside the flange plate (7), the cavity (16) is a quartz cavity, fixing rings (17) used for fixing are arranged at the upper end and the lower end of the cavity, and a plurality of supporting rods (18) are arranged between the fixing rings (17).