CN217561393U

CN217561393U - Electrochemical gas sensitive element performance test system

Info

Publication number: CN217561393U
Application number: CN202220423609.XU
Authority: CN
Inventors: 李晓龙; 张可可
Original assignee: Shangluo University
Current assignee: Shangluo University
Priority date: 2022-02-28
Filing date: 2022-02-28
Publication date: 2022-10-11
Anticipated expiration: 2032-02-28

Abstract

The utility model discloses an electrochemistry gas sensitive element performance test system, including air distribution cavity, multimeter and computer, the bottom of air distribution cavity is provided with the base, the top surface of base has seted up the return groove, the bottom of air distribution cavity is open, the bottom of air distribution cavity inserts to the inboard in return groove, the center department of air distribution cavity front surface has seted up the inlet port, the front surface rotation of air distribution cavity is provided with oval baffle; the gas-sensitive performance testing system is characterized in that a small fan is ingeniously designed in a gas distribution cavity, an air hole for gas to enter, a wire outlet hole led out by a connecting wire for outputting an electric signal and a bottom hole led out by a USB wire for driving the small fan are designed at proper positions, a high-precision multimeter and a computer which are common in the market are externally connected, and the gas-sensitive performance testing system is easily realized.

Description

Electrochemical gas sensitive element performance test system

Technical Field

The utility model belongs to the technical field of gas sensor, concretely relates to electrochemistry gas sensitive element capability test system.

Background

The electrochemical gas sensor has the advantages of capability of quantitatively detecting various gases in the environment, multiple types of detected gases, small volume, high sensitivity, low lower measurement limit, strong anti-interference capability, capability of being used for field detection and the like, occupies the half-wall Jiangshan of the gas sensor, is widely applied to the fields of environmental protection and industry, and most of the finished electrochemical gas sensors are divided into two types at present, wherein one type is a semi-finished product which does not display gas concentration and only sells a gas sensitive element and a circuit board; and the other is a finished electrochemical gas sensor which is packaged integrally and can display gas concentration. Through deep research, the foreign technical level is superior in the field of electrochemical gas sensors. For the reason of technical blockage, foreign famous gas sensor manufacturers only sell gas sensitive elements and corresponding circuit boards in China, and compared with domestic similar products, the gas sensor manufacturers have the advantages of good sensitivity and selectivity and low measurement limit; as for the integrally packaged product, the product is packaged by the domestic manufacturer or sold by the foreign manufacturer at the low end, and the gas sensor packaged by the foreign manufacturer at the aspect of domestic gas sensor has low enough packaging level, so that the gas sensor packaged integrally has poor gas-sensitive performance, generally cannot reach the externally declared index, and the product appearance is rough.

The gas-sensitive performance test of an electrochemical gas sensor is an important way for evaluating the sensor, and a gas-sensitive performance test system involves many problems, such as the design of a gas distribution cabinet (or a gas distribution cavity, a gas distribution box and the like), how to design a gas to be tested to quickly diffuse after coming in, how to transmit and accurately record an electric signal generated after the gas to be tested reacts with the gas sensor and the like, and all the problems cause that the existing gas-sensitive performance test system of the electrochemical gas sensor cannot be basically seen in the current market, and the state does not have the standard about the gas-sensitive performance test system, so that the gas-sensitive performance test system of the electrochemical gas sensor is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electrochemistry gas sensitive element capability test system to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides an electrochemistry gas sensitive element capability test system, includes distribution chamber, multimeter and computer, the bottom of distribution chamber is provided with the base, the top surface of base has seted up back the shape groove, the bottom of distribution chamber is open, the bottom of distribution chamber inserts to the inboard that returns the shape groove, the center department of distribution chamber front surface has seted up the inlet port, the front surface rotation of distribution chamber is provided with oval baffle, the front surface of distribution chamber is equipped with limit structure, one side surface of distribution chamber has seted up the wire hole, the top surface of base is provided with the riser, and the riser is in the inboard of distribution chamber, circular fan hole has been seted up on the top of riser, and install the fan in the circular fan hole.

Preferably, the limiting structure comprises an L-shaped bottom block fixed on the front surface of the air distribution cavity, a telescopic groove is formed in the L-shaped bottom block, an inner sliding block and a spring are arranged in the telescopic groove, the spring is connected between the inner sliding block and the inner wall of the bottom end of the telescopic groove, a telescopic clamping head is fixed on the surface of the top of the inner sliding block, the top end of the telescopic clamping head penetrates through the top of the L-shaped bottom block, and a clamping groove is formed in the surface of the top end of the oval baffle.

Preferably, a screw is fixed on the front surface of the air distribution cavity relative to the upper part of the air inlet hole, and the bottom end of the oval baffle plate is rotatably sleeved on the screw.

Preferably, the inside of L shape bottom block has seted up the rectangle spout for one side in flexible groove, and the inside activity of rectangle spout is provided with L shape shifting block, the front surface of L shape bottom block has seted up preceding slide, the top of L shape shifting block runs through to the front surface of L shape bottom block through preceding slide, seted up between rectangle spout and the flexible groove and connected the slide, and be provided with the connecting block in the connected slide, the both ends of connecting block are fixed mutually with interior slider and L shape shifting block respectively.

Preferably, four mounting holes are uniformly formed in the top end of the vertical plate relative to the periphery of the circular fan hole, and the circle center of the circular fan hole and the circle center of the air inlet hole are on the same horizontal line.

Preferably, the center of the base is provided with a bottom hole in a penetrating manner, and the four corners of the bottom surface of the base are provided with supporting blocks.

Preferably, a sponge sealing gasket is arranged on the inner side of the return groove, and the sponge sealing gasket is tightly attached to the bottom end of the air distribution cavity.

Compared with the prior art, the beneficial effects of the utility model are that:

1. common acrylic organic glass in the market is used as a basic material, a small fan is ingeniously designed in a gas distribution cavity, an air hole for gas to enter, a wire outlet hole led out by a connecting wire for outputting an electric signal and a bottom hole led out by a USB wire for driving the small fan are designed at proper positions, the common high-precision multimeter and the common computer in the market are externally connected, the gas-sensitive performance testing system is easily realized, the testing system has the characteristics of ingenious design and simple manufacture, and the purpose of testing the gas-sensitive performance of the electrochemical gas sensor can be realized by using the common high-precision multimeter and the common computer.

2. Through the limit structure who sets up for oval baffle is rotatory down to turn over the back and can be obtained stable spacing, thereby ensures the overall stability in the follow-up test process, and this limit structure convenient to use simultaneously is convenient for oval baffle rotate once more turn over, uses the flexibility high.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is an enlarged view of a portion of the area A in FIG. 1 according to the present invention;

fig. 3 is a perspective view of the vertical plate of the present invention;

fig. 4 is a top view of the base of the present invention;

fig. 5 is a bottom view of the base of the present invention;

FIG. 6 is a side sectional view of the junction of the elliptical baffle and the air distribution chamber of the present invention;

FIG. 7 is an enlarged view of a portion of the area B of FIG. 6 according to the present invention;

FIG. 8 is a data diagram of the data collected by the multimeter of the present invention made by a computer;

in the figure: 1. a gas distribution cavity; 2. a base; 3. a support block; 4. a universal meter; 5. a computer; 6. an air inlet; 7. an elliptical baffle; 8. an L-shaped bottom block; 9. an L-shaped shifting block; 10. a screw; 11. a card slot; 12. a vertical plate; 13. a loop-back groove; 14. connecting blocks; 15. a telescopic chuck; 16. a telescopic groove; 17. an inner slide block; 18. a spring; 19. a rectangular chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Examples

Referring to fig. 1 to 8, the present invention provides a technical solution: an electrochemical gas-sensitive element performance test system comprises a gas distribution cavity 1, a universal meter 4 and a computer 5, wherein the gas distribution cavity 1 is made of polymethyl methacrylate (PMMA) and is commonly called as acrylic, a base 2 is arranged at the bottom of the gas distribution cavity 1, a return groove 13 is formed in the top surface of the base 2, the bottom of the gas distribution cavity 1 is open, the bottom end of the gas distribution cavity 1 is inserted into the inner side of the return groove 13 and is combined with a sponge sealing gasket arranged in the return groove 13, so that the gas distribution cavity 1 and the base 2 can form a complete closed cavity, a gas inlet 6 is formed in the center of the front surface of the gas distribution cavity 1, the gas to be tested is injected from the position, an oval baffle 7 corresponding to the gas inlet 6 is rotatably arranged on the front surface of the gas distribution cavity 1, the oval baffle 7 is used for manually poking the oval baffle 7 to plug the gas inlet 6 after the gas to be tested is injected, the surface of one side of the air distribution cavity 1 is provided with a wire outlet hole, which aims to lead out a four-core wire connected with a circuit board from the wire outlet hole, the four-core wire is sealed by silica gel after being led out, the diameter of the wire outlet hole is the same as that of an electric wire, thereby ensuring the smooth leading-out of the electric wire and the whole tightness of the air distribution cavity, the surface of the top of the base 2 is provided with a vertical plate 12, the vertical plate 12 is fixed on the base 2 by using the common glue 502 on the market, the top end of the vertical plate 12 is provided with a circular fan hole, a fan driven by a USB mode is arranged in the circular fan hole, which aims to ensure that the gas to be measured entering the air distribution cavity 1 is rapidly and uniformly filled in the whole cavity under the action of the fan, the fan is provided with a USB wire for power supply, the wire is led out from a round hole on the base, the USB wire is firstly cut off when being led out, and one end without a plug, which is carried by the fan, penetrates through the bottom hole, after passing through the bottom hole, the USB cable is connected with the section with the plug end, the cutting operation is to realize the purpose that the USB cable is led out from the bottom hole, and silica gel is used for sealing from the lower part of the base.

In this embodiment, preferably, the front surface of the air distribution chamber 1 is provided with a limiting structure corresponding to the oval baffle 7, the limiting structure includes an L-shaped bottom block 8,L fixed on the front surface of the air distribution chamber 1, an expansion groove 16 is formed inside the L-shaped bottom block 8, an inner slider 17 and a spring 18 are arranged inside the expansion groove 16, the spring 18 is connected between the inner slider 17 and the inner wall of the bottom end of the expansion groove 16, an expansion chuck 15 is fixed on the top surface of the inner slider 17, the top end of the expansion chuck 15 penetrates through to the top of the L-shaped bottom block 8, the top end surface of the oval baffle 7 is provided with a clamping groove 11 corresponding to the expansion chuck 15, a screw 10 is fixed on the front surface of the air distribution chamber 1 above the air inlet 6, the bottom end of the oval baffle 7 is rotatably sleeved on the screw 10, a rectangular sliding groove 19 is formed in the L-shaped bottom block 8 relative to one side of the telescopic groove 16, a front slide corresponding to the L-shaped shifting block 9 is formed in the front surface of the L-shaped shifting block 9,L-shaped bottom block 8, which is movably arranged in the rectangular sliding groove 19, the top end of the L-shaped shifting block 9 penetrates through the front surface of the L-shaped bottom block 8 through the front slide, a connecting slide is formed between the rectangular sliding groove 19 and the telescopic groove 16, a connecting block 14 is arranged in the connecting slide, two ends of the connecting block 14 are respectively fixed with the inner slide 17 and the L-shaped shifting block 9, the telescopic chuck 15 can be shifted through the L-shaped shifting block 9, and therefore limiting and subsequent re-screwing-out of the oval baffle 7 after being screwed in are achieved.

In this embodiment, preferably, four mounting holes are uniformly formed in the top end of the vertical plate 12 around the circular fan hole for mounting a fan, the circle center of the circular fan hole and the circle center of the air inlet hole 6 are on the same horizontal line, a bottom hole is formed in the center of the base 2 in a penetrating manner, the bottom hole is used for leading out a USB wire on the fan, and the hole is sealed by silica gel below the base after the USB wire is led out. Four corners of base 2 bottom surface all are provided with bracer 3, and bracer 3 is the square, can lift whole air distribution chamber 1, has also guaranteed that the part that the USB line stretched out can not pressed.

In this embodiment, preferably, a sponge sealing pad is disposed on the inner side of the square-shaped groove 13, and the sponge sealing pad is tightly attached to the bottom end of the air distribution chamber 1 for sealing the air distribution chamber 1 after installation.

The detection object of the electrochemical gas sensor performance test system is a single electrochemical gas sensor, according to investigation, the gas sensor performance test system aiming at the semiconductor gas sensor in the current market is mature, for example, the WS-30A gas sensor test system of Zhengzhou Weisheng science and technology Limited company needs to work in the temperature range of about 300-500 ℃ because the working temperature of the semiconductor gas sensor is not room temperature, but the electrochemical gas sensor is aimed at in the design and works at room temperature, so the test system and the gas sensor performance test system of the semiconductor gas sensor are completely different. The testing system can simultaneously measure a plurality of gas sensors in the patent of Xu Yingqing of the university of Qinghua (with the publication number of CN 212228890U), and the testing system is different in applicable objects aiming at a single electrochemical gas sensor; moreover, the test system in the patent also includes at least two kinds of air flow control pipelines and the like, which are not in the test system of the present design; in addition, the gas sensor detection device in the patent utilizes an array sensor mechanism simulating animal olfaction to realize the test of gas-sensitive performance of a single or multiple gas sensors at different positions of a test inner cavity, in the design, the gas sensor detection device works on the principle that electric signals generated when gas and gas-sensitive materials in a gas-sensitive element react are in direct proportion to gas concentration, the electric signals are collected by a high-precision multimeter and displayed on a computer, and then a working curve is fitted according to the known gas concentration and the obtained electric signal data, so that the aim of detecting the gas with the concentration to be detected can be realized; finally, the detection system described in the Xu Yingqing patent is much more complex than the detection system described in the present disclosure.

The data collected by the high-precision multimeter is mapped by a computer, and the data shown in FIG. 8 can be obtained.

The utility model discloses the model of well fan is FXDS-DC8025.

The utility model discloses in mention the universal meter, for being the science and technology high accuracy digital multimeter, specific model is 34460A. This multimeter is equipped with two modules: the device comprises a power supply module and a data acquisition module. The power module provides electric potential required by work for the electrochemical gas sensor, and the data acquisition module can acquire electric signals generated by the reaction of gas to be detected and gas-sensitive materials in the electrochemical sensor.

The utility model discloses a theory of operation and use flow: during the use of the electrochemical gas sensitive element performance testing system, firstly, a small fan is installed in a circular fan hole at the top end of a vertical plate 12, a USB wire on the small fan penetrates to the outer side of a base 2 through a bottom hole, the USB wire is firstly cut off when the small fan penetrates through the bottom hole, one end without a plug, carried by the fan, penetrates through the bottom hole and is connected with the section with the plug end, the cutting operation is to achieve the purpose that the USB wire is led out from the bottom hole, the bottom hole is sealed by silica gel from the outside, the vertical plate 12 is fixed at the top of the base 2, then a gas distribution cavity 1 is installed at the top of the base 2, the bottom end of the gas distribution cavity 1 is inserted into the inner side of a square groove 13, and the circle center of the fan and the circle center of an air inlet hole 6 are positioned on the same horizontal line, when the gas sensitive performance of the gas sensitive element needs to be evaluated, firstly, connecting the gas sensitive element and the circuit board, then placing the gas sensitive element and the circuit board into the inner side of the gas distribution cavity 1, then leading out a connecting line led out from the circuit board through a wire outlet hole, sealing the hole after leading out by silica gel, connecting the led out electric wire to the universal meter 4, then connecting the universal meter 4 with the computer 5, electrifying, opening the universal meter 4 and the computer 5, supplying power to the fan through the led out USB wire, so that the fan starts to work, the computer 5 has reading and displaying, then injecting gas with known volume fraction and known volume into the gas distribution cavity 1 through the gas inlet hole 6, immediately rotating the elliptic baffle 7 to turn down after the gas injection is completed, so that the elliptic baffle 7 seals the gas inlet hole 6, rapidly realizing uniformity of the gas in the gas distribution cavity 1 under the action of the fan, reacting the gas with the gas sensitive material in the gas sensitive element, and collecting the generated electric signals through the connecting line by the universal meter 4, then, the gas sensor is displayed by the computer 5, and a working curve can be drawn by reading the computer 5 and calculating the gas concentration, so that gas-sensitive performance indexes such as sensitivity, lower measurement limit and the like of the gas sensor constructed based on the gas sensor are obtained, and the performance test of the gas sensor can be completed; when the oval baffle 7 is turned downwards in a rotating mode, the L-shaped shifting block 9 can be pressed downwards, the connecting block 14 drives the inner sliding block 17 and the telescopic clamping head 15 to move downwards, the spring 18 is gradually compressed until the top end of the telescopic clamping head 15 retracts into the inner side of the telescopic groove 16, the oval baffle 7 can be smoothly turned downwards, one end of the oval baffle 7 is screwed into the inner side of the L-shaped bottom block 8, the L-shaped shifting block 9 is loosened, the spring 18 pushes the inner sliding block 17 back, the telescopic clamping head 15 rebounds, the top end of the telescopic clamping head 15 is clamped into the inner side of the clamping groove 11, limitation after the oval baffle 7 is turned downwards can be achieved, stability in a subsequent testing process is improved, when the oval baffle 7 needs to be turned upwards in a subsequent rotating mode, the L-shaped shifting block 9 only needs to be pressed downwards again, the top end of the telescopic clamping head 15 retracts into the inner side of the telescopic groove 16 again, the oval baffle 7 can be turned upwards in a rotating mode, and the air inlet hole 6 is exposed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An electrochemical gas sensor performance test system is characterized in that: the air distribution box comprises an air distribution cavity (1), a universal meter (4) and a computer (5), wherein a base (2) is arranged at the bottom of the air distribution cavity (1), a return groove (13) is formed in the top surface of the base (2), the bottom of the air distribution cavity (1) is open, the bottom end of the air distribution cavity (1) is inserted into the inner side of the return groove (13), an air inlet hole (6) is formed in the center of the front surface of the air distribution cavity (1), an oval baffle (7) is rotatably arranged on the front surface of the air distribution cavity (1), a limiting structure is arranged on the front surface of the air distribution cavity (1), an outlet hole is formed in one side surface of the air distribution cavity (1), a vertical plate (12) is arranged on the top surface of the base (2), the vertical plate (12) is located on the inner side of the air distribution cavity (1), a circular fan hole is formed in the top end of the vertical plate (12), and a fan is installed in the circular fan hole.

2. The electrochemical gas sensor performance test system of claim 1, wherein: the limiting structure comprises an L-shaped bottom block (8) fixed to the front surface of the air distribution cavity (1), a telescopic groove (16) is formed in the L-shaped bottom block (8), an inner sliding block (17) and a spring (18) are arranged in the telescopic groove (16), the spring (18) is connected between the inner sliding block (17) and the inner wall of the bottom end of the telescopic groove (16), a telescopic clamping head (15) is fixed to the surface of the top of the inner sliding block (17), the top end of the telescopic clamping head (15) penetrates through the top of the L-shaped bottom block (8), and a clamping groove (11) is formed in the surface of the top end of the oval baffle (7).

3. The system for testing the performance of an electrochemical gas sensor as recited in claim 2, wherein: a screw (10) is fixed on the front surface of the air distribution cavity (1) relative to the upper part of the air inlet hole (6), and the bottom end of the oval baffle plate (7) is rotatably sleeved on the screw (10).

4. An electrochemical gas sensor performance testing system according to claim 2, wherein: rectangle spout (19) have been seted up for one side of flexible groove (16) to the inside of L shape bottom block (8), and the inside activity of rectangle spout (19) is provided with L shape shifting block (9), the preceding slide has been seted up to the front surface of L shape bottom block (8), the top of L shape shifting block (9) runs through to the front surface of L shape bottom block (8) through preceding slide, seted up between rectangle spout (19) and flexible groove (16) and connected the slide, and be provided with connecting block (14) in the connection slide, the both ends of connecting block (14) are fixed mutually with interior slider (17) and L shape shifting block (9) respectively.

5. The system for testing the performance of an electrochemical gas sensor according to claim 1, wherein: four mounting holes are uniformly formed in the top end of the vertical plate (12) relative to the periphery of the circular fan hole, and the circle center of the circular fan hole and the circle center of the air inlet hole (6) are on the same horizontal line.

6. The system for testing the performance of an electrochemical gas sensor according to claim 1, wherein: the center department of base (2) runs through and has seted up the bottom outlet, four corners on base (2) bottom surface all are provided with bracer (3).

7. The system for testing the performance of an electrochemical gas sensor according to claim 1, wherein: the inner side of the return groove (13) is provided with a sponge sealing pad, and the sponge sealing pad is tightly attached to the bottom end of the air distribution cavity (1).