CN116818988A - Sensor testing system - Google Patents

Abstract

The application discloses a sensor testing system which comprises a testing device, an air supply device and a vacuumizing device, wherein the testing device is used for testing a sensor; the testing device comprises a gas chamber, a containing part and a driving part, wherein the containing part is positioned in the gas chamber and is provided with a containing cavity for placing a sensor to be tested, the driving part is connected with the containing part, and the driving part is used for controlling the communication or isolation between the containing cavity and the gas chamber; the gas supply device comprises a first pipeline, the first pipeline is connected with the testing device, the first pipeline is provided with a first channel, and at least part of the first channel is communicated with the gas chamber; the vacuum pumping device comprises a second pipeline, the second pipeline is connected with the testing device, the second pipeline is provided with a second channel, and at least part of the second channel is communicated with the gas chamber. Thus, the measurement accuracy is improved.

Description

Sensor testing system

Technical Field

The application relates to the technical field of gas sensor testing, in particular to a sensor testing system.

Background

The response time of the gas detector is the response sensitivity of the built-in sensor to the gas, the shorter the time is, the higher the sensitivity of the sensor is, the faster the alarm speed is, the longer the time is, the lower the sensitivity of the sensor is, the slower the alarm speed is, and when the gas leakage exists, the alarm delay can cause serious consequences.

The current testing technology for the gas sensor has great error in measuring the response time of the gas sensor, and the test result cannot objectively and truly reflect the actual response time of the gas sensor.

Accordingly, there is a need to provide a sensor testing system that solves the above-mentioned problems.

Disclosure of Invention

The application aims to provide a sensor testing system with high measurement accuracy.

The aim of the application is achieved by the following technical scheme:

a sensor testing system comprises a testing device, an air supply device and a vacuumizing device;

the testing device comprises a gas chamber, a containing part and a driving part, wherein the containing part is positioned in the gas chamber and is provided with a containing cavity for placing a sensor to be tested, the driving part is connected with the containing part, and the driving part is used for controlling the communication or isolation between the containing cavity and the gas chamber;

the gas supply device comprises a first pipeline, the first pipeline is connected with the testing device, the first pipeline is provided with a first channel, and at least part of the first channel is communicated with the gas chamber;

the vacuum pumping device comprises a second pipeline, the second pipeline is connected with the testing device, the second pipeline is provided with a second channel, and at least part of the second channel is communicated with the gas chamber.

The sensor testing system comprises a testing device, an air supply device and a vacuumizing device, wherein the testing device comprises a gas chamber, the air supply device is connected with the gas chamber through a first pipeline so as to supply air to the gas chamber, and the vacuumizing device is connected with the gas chamber through a second pipeline so as to vacuumize the gas chamber. The accommodating part for accommodating the sensor to be measured is positioned in the gas chamber, and the driving part controls the accommodating cavity to be communicated with or isolated from the gas chamber. The sensor testing system can simultaneously realize the vacuum state in the accommodating cavity and the inflation state in the gas chamber before testing, so that the gas in the gas chamber can quickly enter the accommodating cavity in the vacuum state in the testing process and is contacted with the sensor to be tested, the measuring error is reduced, and the measuring accuracy is improved.

Drawings

FIG. 1 is a schematic diagram of a sensor testing system according to the present application;

FIG. 2 is a perspective view of the testing device of FIG. 1;

FIG. 3 is a perspective view of a portion of the components within the enclosure of FIG. 2;

FIG. 4 is a top view of a portion of the components within the enclosure shown in FIG. 3;

FIG. 5 is a top view of the enclosure, housing member, and drive member of FIG. 3;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 5;

FIG. 7 is a perspective view of the closure, housing member, and drive member of FIG. 5;

FIG. 8 is an exploded view of the closure, housing member, and drive member of FIG. 7;

FIG. 9 is an exploded view of a portion of the assembly of FIG. 8;

FIG. 10 is an exploded view of the first housing, the second housing, and the sensor under test of FIG. 8;

FIG. 11 is an exploded view of the seal cap, bottom shell of FIG. 8;

FIG. 12 is a perspective view of the housing member, drive member, and seal cover of FIG. 6;

FIG. 13 is an exploded view of the housing member, drive member, and seal cap of FIG. 12;

FIG. 14 is a front view of the housing member, drive member, and seal cap of FIG. 12;

FIG. 15 is a schematic view of the second housing of FIG. 13, illustrating the installation of a sensor to be tested;

FIG. 16 is another perspective view of the first housing of FIG. 13;

FIG. 17 is a top view of the first housing of FIG. 16;

FIG. 18 is a schematic view of the second housing of FIG. 13 at another angle;

FIG. 19 is a top view of the second housing shown in FIG. 18;

FIG. 20 is a perspective view of the compression assembly of FIG. 8;

FIG. 21 is an exploded view of the compression assembly of FIG. 20;

FIG. 22 is a perspective view of the mount of FIG. 21;

fig. 23 is a front view of fig. 22;

FIG. 24 is a perspective view of the bracket of FIG. 22;

FIG. 25 is an exploded view of the lever, connector of FIG. 20;

FIG. 26 is an exploded view of the hold-down bar and hold-down member of FIG. 20;

FIG. 27 is a top view of the first and second housings of FIG. 10;

fig. 28 is a cross-sectional view of fig. 27 taken along the direction B-B.

Detailed Description

Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. If there are several specific embodiments, the features in these embodiments can be combined with each other without conflict. When the description refers to the accompanying drawings, the same numbers in different drawings denote the same or similar elements, unless otherwise specified. What is described in the following exemplary embodiments does not represent all embodiments consistent with the application; rather, they are merely examples of apparatus, articles, and/or methods that are consistent with aspects of the application as set forth in the claims.

The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. As used in the specification and claims of the present application, the singular forms "a," "an," or "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that words such as "first," "second," and the like, used in the description and in the claims of the present application, do not denote any order, quantity, or importance, but rather are names used to distinguish one feature from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the terms "front," "rear," "upper," "lower," and the like are used herein for convenience of description and are not limited to a particular location or to a spatial orientation. The word "comprising" or "comprises", and the like, is an open-ended expression, meaning that elements appearing before "comprising" or "including", encompass the elements appearing after "comprising" or "including", and equivalents thereof, and not exclude that elements appearing before "comprising" or "including", may also include other elements. In the present application, if a plurality of the above-mentioned components are present, the meaning of the above-mentioned components is two or more.

Current testing techniques for gas sensors vary the gas concentration of the test chamber for longer than the actual response time of the gas sensitive material. Therefore, when the response time of the gas sensor is measured, a large error exists, and the test result cannot objectively and truly reflect the actual response time of the gas sensor.

To this end, the present application provides a sensor testing system for testing response time of a gas sensor, referring to fig. 1 to 28, comprising a testing device 10, a gas supply device 20, a vacuum pumping device 30 and a testing circuit 40, wherein the testing device 10 comprises a gas chamber 200, the vacuum pumping device 30 is used for pumping vacuum to the gas chamber 200, and the gas supply device 20 is used for introducing gas to be tested into the gas chamber 200.

Referring to fig. 2 and 6, the testing device 10 includes a casing 1, a sealing device 2 disposed in the casing 1, a housing part 3, and a driving part 4, wherein a sealed space enclosed by the sealing device 2 is a gas chamber 200, and the housing part 3 includes a housing cavity 301 for placing the sensor 50 to be tested.

In the illustrated embodiment of the present application, the housing member 3 is provided in the gas chamber 200. The housing part 3 is connected to the driving part 4, and the driving part 4 is used for controlling the communication or isolation between the housing cavity 301 and the gas chamber 200. When the vacuum pumping is performed, the driving part 4 controls the accommodating cavity 301 to be opened, the accommodating cavity 301 is guaranteed to be in a vacuum state after being sealed, air interference is reduced, the vacuum pumping is finished, the driving part 4 controls the accommodating cavity 301 to be sealed, at the moment, the accommodating cavity 301 and the gas chamber 200 cannot be in gas communication, gas to be measured is introduced into the gas chamber 200, after the gas parameters are stable, the driving part 4 controls the accommodating cavity 301 to be opened, and the sensor 50 to be measured is in quick contact with the gas to be measured, so that the response time of the gas sensor is tested, the testing efficiency is high, and the measuring precision is high.

As shown in fig. 3, a support stand 11 is provided in the casing 1, and the sealing device 2 is provided on the support stand 11. As shown in fig. 7, the sealing device 2 may be opened or closed, and when the sensor 50 to be measured needs to be placed or taken out, the sealing device 2 is opened, and when the response time of the sensor 50 to be measured needs to be tested, the sealing device 2 is adjusted to be in a closed state.

Referring to fig. 7, the closure 2 includes a bottom case 21, a sealing cover 22 mated with the bottom case 21, and a pressing assembly 23. The bottom shell 21 and the sealing cover 22 are both positioned at the periphery of the gas chamber 200, the pressing assembly 23 has a pressing state, when the pressing assembly 23 is in the pressing state, the pressing assembly 23 abuts against at least one of the sealing cover 22 and the bottom shell 21, and the sealing cover 22 is in sealing connection with the bottom shell 21.

As shown in fig. 1, the gas supply device 20 includes a first pipe 400, the first pipe 400 being connected to the testing device 10, the first pipe 400 having a first passage, at least part of which communicates with the gas chamber 200. The evacuation device 30 includes a second conduit 500, the second conduit 500 being connected to the testing device 10, the second conduit 500 having a second passageway, at least a portion of which is in communication with the gas chamber 200.

The evacuation device 30 further includes a vacuum pump (not shown) coupled to the second conduit 500. Before testing, the vacuum pump vacuumizes the gas chamber 200, after the vacuumization is finished, the accommodating cavity is closed, then the gas to be tested is introduced into the gas chamber 200 through the gas supply device 20, and the sensor 50 to be tested is tested after the gas pressure is constant. As shown in fig. 1 and 4, the air supply device 20 further includes a pressure reducing valve 71, a flow meter 72, and a flow valve 73, and the pressure reducing valve 71, the flow meter 72, and the flow valve 73 are provided in the first pipe 400, and/or the test device 10 further includes a pressure gauge 201, the pressure gauge 201 being provided in the bottom case 21, connected to the bottom case 21. The pressure gauge 201 is used to test the pressure of the gas chamber 200. In other embodiments, the pressure gauge 201 is disposed on the seal cover 22 and is connected to the seal cover.

Specifically, as shown in fig. 11, the bottom case 21 is provided with a first port 202 and a second port 203, the air supply device 20 is connected to the first port 202 through a pipe, and the vacuum pumping device 30 is connected to the second port 203 through a pipe. The first port 202 and the second port 203 are provided on the outer peripheral wall surface of the bottom case 21.

In the illustrated embodiment of the present application, the bottom shell 21 has a cylindrical structure with an open upper end, which is convenient for manufacturing and molding. Of course, in other embodiments, the bottom case 21 may have a square tubular structure, a six-sided tubular structure, or the like.

The bottom shell 21 is detachably connected with the sealing cover 22 through a fastener, specifically, referring to fig. 11, a first through hole 221 is formed in the sealing cover 22, a first flange 211 is formed at the upper end edge of the bottom shell 21, a screw hole 2111 is formed in the first flange 211, the first flange 211 is fixed with the sealing cover 22 through a bolt or a screw, and the bolt or the screw passes through the first through hole 221 of the sealing cover 22 to be fastened with the screw hole 2111. In addition, a second flange 212 is provided at the lower end of the outer circumference of the bottom case 21, and the second flange 212 is detachably mounted to the support table 11 of the cabinet 1 by screws or bolts.

With continued reference to fig. 11, the first flange 211 is provided with a positioning portion 2112, the sealing cover 22 is provided with a positioning hole 222, and when assembled, the sealing cover 22 is covered on the bottom shell 21, and the positioning portion 2112 passes through the positioning hole 222 to perform a positioning function. The positioning portion 2112 has a cylindrical structure, and a chamfer is provided at an upper end of the cylindrical structure, so that the sealing cover 22 and the first flange 211 of the bottom shell 21 can be positioned and assembled conveniently.

A sealing ring (not shown) is provided between the first flange 211 and the sealing cover 22, and the sealing ring is an O-ring with a trapezoidal cross section, so that the sealing performance of the gas chamber 200 is improved, and gas leakage is prevented. Specifically, referring to fig. 11, a second sealing groove 2113 is provided on the end surface of the first flange 211, the second sealing groove 2113 is an annular groove, the positioning portion 2112 and the screw hole 2111 are both located at the periphery of the second sealing groove 2113, the sealing cover 22 compresses the sealing ring in the second sealing groove 2113, and the sealing cover 22 is locked with the bottom shell 21 by a bolt or a screw. The handles 223 are arranged on the sealing cover 22, and the handles 223 are symmetrically arranged in two, so that the taking and placing are convenient.

The pressing assemblies 23 are provided in at least two sets, referring to fig. 7 and 20, and each set of pressing assemblies 23 includes a support 231, a pressing rod 232 rotatably coupled to the support 231, a pressing member 233 provided on the pressing rod 232, a connecting member 234 rotatably coupled to the pressing rod 232, and a lever 235. The upper end of the connecting piece 234 is rotatably connected with the upper end of the operating rod 235, the lower end of the connecting piece 234 is rotatably connected with the other connecting point of the pressing rod 232, and the lower end of the operating rod 235 is rotatably connected with the other connecting point of the supporting seat 231. When the operating rod 235 rotates around the support 231 in a direction away from the sealing cover 22, the support 231 drives the pressing rod 232 to be away from the sealing cover 22 through the connecting piece 234, the pressing piece 233 loosens the sealing cover 22, and the sealing cover 22 can be moved away from the bottom shell 21, so that the sensor 50 to be measured can be conveniently taken out or placed; when the lever 235 rotates around the support 231 in a direction approaching the sealing cover 22, the pressing piece 233 gradually presses the sealing cover 22 against the bottom case 21, and the gas chamber 200 is in a closed state.

Referring to fig. 22, the support 231 is provided with a first hinge shaft 2311 and a first connection hole 2312, and the first hinge shaft 2311 is located at an outer upper end of the first connection hole 2312. Specifically, the distance between the first hinge shaft 2311 and the closing device 2 is greater than the distance between the first connection hole 2312 and the closing device 2 in the horizontal direction, and the first hinge shaft 2311 is located at the upper end of the first connection hole 2312 in the vertical direction. Fig. 20 is a schematic view of the pressing assembly 23 in a pressed state, and then the positional relationship between the components is defined when the pressing assembly 23 is in a pressed state, referring to fig. 20 to 26, the pressing rod 232 is provided with a second connection hole 2321 and a third connection hole 2322, the second connection hole 2321 is located outside the third connection hole 2322, and the pressing rod 232 is hinged to the first hinge shaft 2311 of the support 231 through the second connection hole 2321. The connecting member 234 is provided with a fourth connection hole 2341 and a second hinge shaft 2342, the fourth connection hole 2341 is positioned at the upper end of the second hinge shaft 2342, the operating lever 235 is provided with a third hinge shaft 2351 and a fourth hinge shaft 2352, the third hinge shaft 2351 is positioned at the upper end of the fourth hinge shaft 2352, the operating lever 235 is hinged with the fourth connection hole 2341 of the connecting member 234 through the third hinge shaft 2351, and the operating lever 235 is hinged with the first connection hole 2312 of the support 231 through the fourth hinge shaft 2352. The link 234 is hinged to the pressing bar 232 by a second hinge shaft 2342.

Referring to fig. 22, a blocking portion 2301 is provided on one side surface of the holder 231, and the blocking portion 2301 is used to support the lever 235 in the non-compressed state. The blocking portion 2301 is located below the first hinge shaft 2311 and also outside the first connection hole 2312. The stopper 2301 has a rectangular parallelepiped structure inclined with respect to a horizontal plane.

With continued reference to fig. 22, the stand 231 includes a bracket 2302 and a base 2303, the bracket 2302 is fixed to the base 2303, the base 2303 is fixed to the support stand 11 of the cabinet 1, and the first hinge shaft 2311 and the first connection hole 2312 are provided on the bracket 2302. Referring to fig. 22 and 23, the top end of the bracket 2302 is provided with a recess 100, and the recess 100 provides a rotational space for the connector 234. The concave portion 100 includes an inclined surface 101 and an arc-shaped surface 102 concavely formed toward the bracket 2302, the inclined surface 101 is inclined from the first hinge shaft 2311 toward the first connection hole 2312, the lower end surface of the connection member 234 is adapted to the arc-shaped surface 102 of the concave portion 100, and when the connection member 234 is rotated to the position of the inclined surface 101, the side surface of the connection member 234 is adapted to the inclined surface 101.

Referring to fig. 24, the bracket 2302 includes two L-shaped first plate portions 23021 and first connection portions 23022 connecting the two first plate portions 23021, the two first plate portions 23021 being arranged symmetrically at intervals, the first connection portions 23022 connecting inner sides of the two first plate portions 23021. The blocking portion 2301 is provided on one of the first plate portions 23021, and the first hinge shaft 2311 of the holder 231 sequentially passes through one of the first plate portions 23021, the second connection hole 2321, and the other first plate portion 23021.

Referring to fig. 26, the pressing rod 232 includes a ring member 2323 and a second plate portion 2324 extending outward from one end of the ring member 2323, and the second connection hole 2321 and the third connection hole 2322 are opened on the second plate portion 2324. The presser 233 is fixed to the annular member 2323. The axes of the first, second, third and fourth connection holes 2312, 2321, 2322 and 2341 are parallel to each other. The pressing piece 233 comprises a pressing part 2331 and a shaft-shaped component 2332 connected with the top end of the pressing part 2331, the pressing part 2331 and the shaft-shaped component 2332 can be integrally formed, at least one part of the outer surface of the shaft-shaped component 2332 is provided with external threads, the shaft-shaped component 2332 penetrates through the annular component 2323, the external threads of the shaft-shaped component 2332 are connected with the nut 2333 in a meshed mode, and then the shaft-shaped component 2332 and the annular component 2323 are locked.

In the illustrated embodiment of the present application, the entire surface of the shaft-shaped member 2332 is provided with external threads, and both the upper and lower ends of the shaft-shaped member 2332 are locked to the ring-shaped member 2323 by nuts 2333, and the fixing position of the shaft-shaped member 2332 to the ring-shaped member 2323 can be adjusted by screwing up and down the screws, thereby achieving the distance between the pressing portion 2331 and the sealing cap 22.

Referring to fig. 26, a washer 2334 is further disposed between each nut 2333 and the annular member 2323, and the washer 2334 is sleeved on the shaft-shaped member 2332. In the illustrated embodiment of the present application, the gasket 2334 has a circular structure, a square structure, a hexagonal structure, and the like, and the gasket 2334 is symmetrically provided with a pair of bending portions 2335, the bending portions 2335 are flat plates vertically bent from the edges of the gasket 2334, the gasket 2334 is tightly attached to the surface of the annular member 2323, and the flat plates are tightly attached to the side surfaces of the annular member 2323. By providing the bending portion 2335, the contact area between the gasket 2334 and the annular member 2323 is increased, the connection stability between the shaft-shaped member 2332 and the annular member 2323 is improved, and the shaft-shaped member 2332 is prevented from swinging in the horizontal direction.

The pressing portion 2331 includes an upper portion having a truncated cone structure with a diameter gradually increasing from the shaft-like member 2332 to a lower portion having a truncated cone structure with a diameter gradually decreasing from the upper portion to the outside, and a lower portion having a thickness greater than that of the upper portion.

In the illustrated embodiment of the application, the annular member 2323 is an elongated annular structure, and the pressing portion 2331 is adjustable in position of the elongated annular structure, that is, the distance between the pressing portion 2331 and the center position of the seal cover 22 is adjustable.

Referring to fig. 21, the operating lever 235 includes an inverted U-shaped member 2353 and an operating member 2354 fixed to an upper end of the U-shaped member 2353, and a third hinge shaft 2351 of the operating lever 235 sequentially passes through one plate of the U-shaped member 2353, a fourth connection hole 2341 of the connection member 234, and the other plate of the U-shaped member 2353. The fourth hinge shaft 2352 of the operating lever 235 sequentially passes through one of the plates of the U-shaped member 2353, the first connection hole 2312 of the holder 231, and the other plate of the U-shaped member 2353.

Referring to fig. 25, the u-shaped member 2353 includes an inner connection end 2355, an outer connection end 2356, and an intermediate region 2357 connecting the inner connection end 2355 and the outer connection end 2356. The intermediate region 2357 is flared with respect to the inner and outer link ends 2355, 2356, and the space within the intermediate region 2357 is increased to avoid interference between the intermediate region 2357 and the stent 2302. The third hinge shaft 2351 is located at the inner connection end 2355, and the fourth hinge shaft 2352 is located at the outer connection end 2356.

With continued reference to fig. 25, the connecting member 234 includes two third plate portions 2343 disposed at intervals and a second connecting portion 2344 connecting the two third plate portions 2343, the second connecting portion 2344 connecting the inner sides of the two third plate portions 2343. The second hinge shaft 2342 of the connection member 234 sequentially passes through one of the third plate portions 2343, the third connection hole 2322 of the pressing bar 232, and the other third plate portion 2343. The second connecting portion 2344 has a bent plate portion 2345 at an upper end thereof.

In the illustrated embodiment of the application, the compressing assemblies 23 are arranged in three groups, and the three groups of compressing assemblies 23 are uniformly distributed on the periphery of the sealing device 2 so as to ensure that the sealing cover 22 is stressed uniformly. In other embodiments, the compression assemblies may be provided in two sets, without limitation.

Referring to fig. 8, the housing part 3 includes a first housing 31 and a second housing 32, and the driving part 4 is connected to the first housing 31. The driving part 4 controls the separation of the first housing 31 from the second housing 32. When the first housing 31 is separated from the second housing 32, there is a space between the first housing 31 and the second housing 32, the accommodating chamber 301 communicates with the gas chamber 200, and/or the driving part 4 is used to control the first housing 31 to close with the second housing 32, and when the first housing 31 is closed with the second housing 32, the accommodating chamber 301 forms a closed accommodating chamber, and the closed accommodating chamber is isolated from the gas chamber 200.

In the illustrated embodiment of the present application, the first housing 31 is located at the upper end of the second housing 32, that is, the first housing 31 and the second housing 32 may be separated from or closed to each other along the height direction Z of the test device 10. I.e. the distance the drive member 4 controls the movement of the first housing 31 relative to the second housing 32 in the height direction Z of the testing device 10.

When the driving part 4 controls the first housing 31 and the second housing 32 to be separated, the sensor 50 to be measured is exposed to the gas chamber 200; when the driving part 4 controls the first shell 31 and the second shell 32 to be closed, the first shell 31 and the second shell 32 enclose a closed accommodating cavity 301.

In the illustrated embodiment of the present application, the first housing 31 and the second housing 32 each have a flat plate structure. Referring to fig. 10 and 13, the first housing 31 is provided with a first groove 311 in a flat plate structure, and the second housing 32 is provided with a second groove 323. The first groove 311 has a first opening 600, the second groove 323 has a second opening 700, the second opening 700 faces the first housing 31, and the first opening 600 faces the second housing 32. The receiving cavity 301 includes a first recess 311 and a second recess 323. After the first housing 31 is separated from the second housing 32, a portion of the sensor 50 to be measured is exposed outside the second recess 323 of the second housing 32, so that the sensor can be timely contacted with the gas in the gas chamber 200.

As shown in fig. 16 and 17, the first groove 311 includes a first groove 312 and a second groove 313. Referring to fig. 28, the first housing 31 has a first end surface 310, and the first end surface 310 coincides with a surface where the first opening 600 is located. The distance between the bottom surface of the first groove 312 and the plane of the first end surface 310 is H1, the distance between the bottom surface of the second groove 313 and the plane of the first end surface 310 is H2, and H2 > H1. The first groove 312 and the second groove 313 have coplanar first side walls 314, and the distance between the two first side walls 314 is the width of the first groove 312, and the width directions W-W of the first groove 312 and the second groove 313 are identical and have the same width value.

Referring to fig. 18 and 19, the second groove 323 includes a third groove 324 and a fourth groove 325, the third groove 324 includes two second sidewalls 326, the two second sidewalls 326 extend along a length direction L-L of the second groove 323, and the two second sidewalls 326 are located at both sides of the third groove 324. The second side wall 326 is recessed to two sides to form a positioning groove 327, the two positioning groove 327 are symmetrically arranged, referring to fig. 15, the sensor 50 to be measured is installed in the third groove 324, two ends of the sensor 50 to be measured are symmetrically provided with lugs 501, and the two lugs 501 are located in the two positioning groove 327. The sensor 50 to be tested also includes a socket portion 502, the socket portion 502 extending toward the fourth slot 325. A portion of the sensor 50 to be measured is positioned outside the third tank 324 to facilitate rapid contact with the gas to be measured. Referring to fig. 28, the second housing 32 has a second end surface 320, and the second end surface 320 coincides with the surface on which the second opening 700 is located. The distance between the bottom surface of the third groove 324 and the plane of the second end surface 320 is H3, the distance between the bottom surface of the fourth groove 325 and the plane of the second end surface 320 is H4, and H4 > H3. When the first housing 31 and the second housing 32 are closed, the first end surface 310 of the first housing 31 abuts against the second end surface 320 of the second housing 32. The fourth groove 325 includes two third sidewalls 328, the two third sidewalls 328 extend along the length direction L-L of the second groove 323, and the two third sidewalls 328 are located at two sides of the fourth groove 325. One of the third side walls 328 of the fourth slot 325 is coplanar with one of the second side walls 326 of the third slot 324. The other third side wall 328 of the fourth groove body 325 is not coplanar with the other second side wall 326 of the third groove body 324, a step portion 329 is formed at the joint of the second side wall 326 and the third side wall 328, and the sensor 50 to be measured abuts against the step portion 329 to prevent the sensor 50 to be measured from shaking. The distance between the two second side walls 326 is the width of the third slot body 324, the distance between the two third side walls 328 is the width of the fourth slot body 325, the width of the third slot body 324 is greater than the width of the fourth slot body 325, and the width of the first slot body 312 is equal to the width of the third slot body 324. The sensor 50 to be tested is installed in the space formed by the first slot 312 and the third slot 324, and the fourth slot 325 is used for accommodating the plug of the test circuit 40.

A seal ring (not shown) is provided between the first housing 31 and the second housing 32, and the seal ring is an O-ring with a trapezoidal cross section, and is tightly pressed between the two to form a sealing connection. Specifically, referring to fig. 19, the upper surface of the second housing 32 is provided with a first sealing groove 321, the first sealing groove 321 is an annular groove and is located at the periphery of the second groove 323, and a sealing ring is installed in the first sealing groove 321.

The first and second housings 31, 32 are located at a central region of the gas chamber 200, and the driving part 4 is connected to the first housing 31 to control the height direction movement of the first housing 31 testing device 10. Referring to fig. 8, the driving part 4 includes a cylinder 41, the cylinder 41 is fixed to the sealing cover 22, and the cylinder 41 is hermetically disposed with the sealing cover 22. As shown in fig. 8, a connecting ring 401 is fixed at the lower end of the cylinder 41, an annular sleeve 220 is arranged on the sealing cover 22, and the connecting ring 401 is fixedly arranged in the annular sleeve 220. The cylinder 41 includes an output shaft 411, the output shaft 411 is provided through the seal cover 22, and the output shaft 411 is connected with the first housing 31. The cylinder 41 controls the up-and-down movement of the first housing 31 with respect to the second housing 32, and enables the separation or closure between the first housing 31 and the second housing 32.

Further, with continued reference to fig. 8, the output shaft 411 is connected at its end to a fixing member 412, and the fixing member 412 is connected to the first housing 31. The connection part between the fixing piece 412 and the first shell 31 is provided with a stabilizing piece 413, see fig. 9, the stabilizing piece 413 is provided with a U-shaped groove 4131, the stabilizing piece 413 is coated on the periphery of the fixing piece 412 through the U-shaped groove 4131, the connection stability of the fixing piece 412 and the first shell 31 is improved, and shaking is prevented in the movement process of the first shell 31.

With continued reference to fig. 9, the mount 412 includes integrally formed first and second members 4121, 4122, each of the first and second members 4121, 4122 being cylindrical and the first and second members 4121, 4122 being coaxial structures. The diameter of the first member 4121 is smaller than the diameter of the second member 4122, and the second member 4122 is fixedly connected to the first housing 31. The U-shaped groove 4131 of the stabilizing member 413 is wrapped around the outer periphery of the second member 4122. The thickness of the stabilizing member 413 is greater than the thickness of the second member 4122, and the stabilizing member 413 also encloses a portion of the first member 4121.

In the illustrated embodiment of the present application, referring to fig. 8, 9 and 12, the second housing 32 is fixed to the inner bottom surface of the bottom case 21. Referring to fig. 18, the second housing 32 is provided with a mounting hole 300, and the inner bottom surface of the bottom case 21 is provided with a screw hole, through which a bolt or screw is fixed to the screw hole through the mounting hole 300. The sensor testing system further includes a guide frame 415 secured to the bottom of the seal cover 22. The guide frame 415 includes a top plate 4151, at least two guide rods 4152 fixed to the top plate 4151, the top plate 4151 is fixed to the bottom of the sealing cover 22 by screws or bolts, and the output shaft 411 passes downward through the top plate 4151. Two guide bars 4152 are provided through the first housing 31, the second housing 32 is fixed to the bottom chassis 21, and the guide bars 4152 function as positioning. Specifically, the first housing 31 is provided with a connecting lug 302, the connecting lug 302 is provided with a second through hole 303, and the guide rod 4152 correspondingly passes through the second through hole 303. Specifically, two guide rods 4152 are symmetrically disposed on the top plate 4151, two connecting lugs 302 are correspondingly disposed on the first housing 31, and a second through hole 303 is disposed on each connecting lug 302.

The sealing cover 22 may be manually removed from the upper end of the bottom case 21, or may be automatically controlled, for example, a handle 223 of the sealing cover 22 is connected to a rope, the other end of the rope is connected to a recovery device, and the rope is recovered by the recovery device, so that the sealing cover 22 moves upward relative to the bottom case 21.

Referring to fig. 4 and 5, the testing device further includes a supporting frame 5 located beside the sealing device 2, when the sensor 50 to be tested is taken and placed, the sealing device 2 is opened, the sealing cover 22 is placed on the supporting frame 5 to support the sealing cover 22, the supporting frame 5 includes two frame bodies 51 arranged at intervals, and the sealing cover 22 is placed at the top ends of the two frame bodies 51.

Referring to fig. 14, the end of the second housing 32 is further provided with a third through hole 322, and the third through hole 322 is used for the passage of an electric wire. The test circuit 40 comprises an electric wire and an inductance tester, the inductance tester is connected with the sensor 50 to be tested through the electric wire, when detection is needed, the output shaft 411 of the air cylinder 41 is recovered, the output shaft 411 drives the first shell 31 to move upwards along the two guide rods 4152, the first shell 31 is separated from the second shell 32, the sensor 50 to be tested is in contact with the gas in the gas chamber 200, the inductance tester records the parameter change condition of the sensor 50 to be tested during the test, and then the response time of the sensor 50 to be tested can be obtained through analysis.

The application relates to a response time testing method of a gas sensor, which comprises the following steps: placing the sensor 50 to be measured into the second housing 32; the sensor 50 to be tested is communicated with the test circuit 40, the first shell 31 and the second shell 32 are confirmed to be in a separated state, the vacuumizing device 30 vacuumizes the gas chamber 200, after vacuumizing is finished, the cylinder 41 controls the first shell 31 to move downwards and be closed with the second shell 32, the gas supply device 20 fills the gas chamber 200 with the gas to be tested, after filling is finished, the first shell 31 is lifted upwards, the sensor 50 to be tested is contacted with the gas to be tested, the inductance tester records the parameter change condition of the sensor 50 to be tested during testing, and then the response time performance parameter of the sensor to be tested can be obtained through analysis.

In summary, the sensor testing system of the present application has the following advantages:

1. before introducing the gas to be tested, vacuumizing the gas chamber 200 and the accommodating cavity 301 to avoid the interference of other gases, and introducing the gas to be tested in a vacuum state to realize controllable gas concentration;

2. at the moment when the accommodating cavity 301 is opened, the to-be-measured sensor 50 is exposed to the atmosphere of the to-be-measured gas, the to-be-measured gas is rapidly diffused to the surface of the to-be-measured sensor 50, the delay time is reduced, and the measurement accuracy is high;

3. the opening and closing of the accommodating cavity 301 are automatically controlled, so that the influence of manual operation is avoided;

4. the test time is short and the working efficiency is high.

The above embodiments are only for illustrating the present application and not for limiting the technical solutions described in the present application, and it should be understood that the present application should be based on those skilled in the art, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the present application without departing from the spirit and scope of the present application and modifications thereof should be covered by the scope of the claims of the present application.

Claims (10)

1. The sensor testing system is characterized by comprising a testing device, an air supply device and a vacuumizing device;

the testing device is provided with a gas chamber, the testing device comprises a containing part and a driving part, the containing part is positioned in the gas chamber, the containing part is provided with a containing cavity for placing a sensor to be tested, the driving part is connected with the containing part, and the driving part is used for controlling the containing cavity to be communicated with or isolated from the gas chamber;

the gas supply device comprises a first pipeline, the first pipeline is connected with the testing device, the first pipeline is provided with a first channel, and at least part of the first channel is communicated with the gas chamber;

the vacuum pumping device comprises a second pipeline, the second pipeline is connected with the testing device, the second pipeline is provided with a second channel, and at least part of the second channel is communicated with the gas chamber.

2. The sensor testing system of claim 1, wherein the housing member comprises a first housing and a second housing, the drive member being coupled to the first housing, the drive member being configured to drive the first housing to move such that the first housing is separated from or closed to the second housing;

when the first shell is separated from the second shell, a space exists between the first shell and the second shell, and the accommodating cavity is communicated with the gas chamber;

when the first shell and the second shell are closed, the accommodating cavity forms a closed accommodating cavity, and the closed accommodating cavity is isolated from the gas chamber.

3. The sensor testing system of claim 2, wherein the drive component is configured to control a distance that the first housing moves relative to the second housing.

4. The sensor testing system of claim 3, wherein the first housing has a first recess, the second housing has a second recess, the first recess has a first opening, the second recess has a second opening, the first opening is oriented toward the second housing, the second opening is oriented toward the first housing, and the receiving cavity comprises the first recess and the second recess.

5. The sensor testing system of claim 4, wherein the first recess comprises a first slot and a second slot, the first housing has a first end face that coincides with a face in which the first opening is located, a bottom face of the first slot is spaced from a plane in which the first end face is located by a distance H1, and a bottom face of the second slot is spaced from a plane in which the first end face is located by a distance H2, and H2 > H1;

the second groove comprises a third groove body and a fourth groove body, the second shell is provided with a second end face, the second end face coincides with the face where the second opening is located, the distance between the bottom face of the third groove body and the plane where the second end face is located is H3, and the distance between the bottom face of the fourth groove body and the plane where the second end face is located is H4, and H4 is more than H3.

6. The sensor testing system of claim 2, wherein the testing device comprises a bottom shell, a sealing cover matched with the bottom shell, and a compacting assembly, wherein the bottom shell and the sealing cover are positioned at the periphery of the gas chamber; the compression assembly has a compression state, and when the compression assembly is in the compression state, the compression assembly abuts against at least one of the sealing cover and the bottom shell, and the sealing cover is in sealing connection with the bottom shell.

7. The sensor testing system of claim 1, wherein said air supply further comprises a flow meter, said flow meter being disposed in said first conduit,

the testing device comprises a bottom shell, a sealing cover and a pressure gauge, wherein the sealing cover and the pressure gauge are matched with the bottom shell, the pressure gauge is used for testing the pressure of the gas chamber, and the pressure gauge is connected with the bottom shell or the sealing cover.

8. The sensor testing system of claim 6, wherein the drive member comprises a cylinder secured to the seal cover, the cylinder being in sealing connection with the seal cover, the cylinder comprising an output shaft disposed through the seal cover, and the output shaft being connected to the first housing.

9. The sensor testing system of claim 8, further comprising a guide frame comprising a top plate and at least two guide bars, the at least two guide bars being secured to the top plate, the top plate being secured to the seal cover, the two guide bars being disposed through the first housing, the second housing being secured to the bottom housing.

10. The sensor testing system of claim 6, wherein the hold-down assembly comprises a support, a hold-down bar, a hold-down member, a connector, and a lever, the hold-down bar is rotatably coupled to the support, the hold-down member is coupled to the hold-down bar, the connector is rotatably coupled to the hold-down bar, an upper end of the connector is rotatably coupled to an upper end of the lever, a lower end of the connector is rotatably coupled to another connection point of the hold-down bar, and a lower end of the lever is rotatably coupled to another connection point of the support.