Sensor test system

Abstract

The application discloses a sensor testing system, which comprises a testing device, a gas supply device and a vacuum pumping device; the testing device comprises a gas chamber, and further comprises a receiving component and a driving component; the receiving component is located in the gas chamber and has a receiving cavity for placing a sensor to be tested; the driving component is connected with the receiving component and is used for controlling the receiving cavity to be in communication or isolation with the gas chamber; the gas supply device comprises a first pipeline connected with the testing device, and the first pipeline has a first channel, at least a part of which is in communication with the gas chamber; and the vacuum pumping device comprises a second pipeline connected with the testing device, and the second pipeline has a second channel, at least a part of which is in communication with the gas chamber. Thus, the measurement accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas sensor testing, in particular to a sensor testing system. BACKGROUND

[0002] The response time of a gas detector is the reaction sensitivity of the built-in sensor to the gas, the shorter the time, the higher the sensitivity of the sensor, the faster the alarm speed, the longer the time, the lower the sensitivity of the sensor, the slower the alarm speed, and when there is gas leakage, the alarm delay will cause serious consequences.

[0003] At present, the testing technology of the gas sensor has a large error when 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.

[0004] Therefore, it is necessary to provide a sensor testing system to solve the above problems. SUMMARY

[0005] The present application aims to provide a sensor testing system with high measurement accuracy.

[0006] The present application is achieved by the following technical solutions:

[0007] A sensor testing system, comprising a testing device, a gas supply device and a vacuum pumping device;

[0008] The testing device comprises a gas chamber, and further comprises a receiving component and a driving component, the receiving component is located in the gas chamber, the receiving component has a receiving cavity for placing a sensor to be tested, and the driving component is connected with the receiving component, and the driving component is used to control the receiving cavity to be in communication or isolation with the gas chamber;

[0009] The gas supply device comprises a first pipeline, the first pipeline is connected with the testing device, and the first pipeline has a first channel, at least part of the first channel is in communication with the gas chamber;

[0010] The vacuum pumping device comprises a second pipeline, the second pipeline is connected with the testing device, and the second pipeline has a second channel, at least part of the second channel is in communication with the gas chamber.

[0011] The sensor testing system of the present application comprises a testing device, a gas supply device and a vacuum pumping device, the testing device comprises a gas chamber, the gas supply device is connected with the gas chamber through a first pipeline to supply gas to the gas chamber, and the vacuum pumping device is connected with the gas chamber through a second pipeline to pump vacuum to the gas chamber. A receiving component for placing a sensor to be tested is located in the gas chamber, and a driving component controls the communication or isolation of the receiving cavity with the gas chamber. The sensor testing system of the present application can realize the vacuum state in the receiving cavity and the inflation state in the gas chamber at the same time before testing, so that the gas in the gas chamber can quickly enter the receiving cavity in a vacuum state and contact the sensor to be tested during the testing process, thereby reducing the measurement error and improving the measurement accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the sensor testing system of the present application.

[0013] Figure 2 It is a perspective view of the testing device. Figure 1

[0014] Figure 3 It is a perspective view of part of the components in the casing. Figure 2

[0015] Figure 4 It is a top view of part of the components in the casing. Figure 3

[0016] Figure 5 It is a top view of the sealing device, the receiving component and the driving component. Figure 3

[0017] Figure 6 It is a sectional view along the direction of A-A. Figure 5

[0018] Figure 7 It is a perspective view of the sealing device, the receiving component and the driving component. Figure 5

[0019] Figure 8 It is an exploded view of the sealing device, the receiving component and the driving component. Figure 7

[0020] Figure 9 It is an exploded view of part of the components. Figure 8

[0021] Figure 10 It is an exploded view of the first casing, the second casing and the sensor to be tested. Figure 8

[0022] Figure 11 It is an exploded view of the sealing cover and the bottom shell. Figure 8 ​​​​​​​​​​

[0023] Figure 12 for Figure 6 The perspective view of the housing component, driving component and sealing cover;

[0024] Figure 13 for Figure 12 The exploded view of the housing component, driving component and sealing cover shown in;

[0025] Figure 14 for Figure 12 The front view of the housing component, driving component and sealing cover shown in;

[0026] Figure 15 for Figure 13 The installation schematic view of the second housing and the sensor to be measured;

[0027] Figure 16 for Figure 13 The perspective view of the first housing from another angle;

[0028] Figure 17 for Figure 16 The top view of the first housing shown in;

[0029] Figure 18 for Figure 13 The structural schematic view of the second housing from another angle;

[0030] Figure 19 for Figure 18 The top view of the second housing shown in;

[0031] Figure 20 for Figure 8 The perspective view of the pressing assembly;

[0032] Figure 21 for Figure 20 The exploded view of the pressing assembly shown in;

[0033] Figure 22 for Figure 21 The perspective view of the support;

[0034] Figure 23 for Figure 22 The front view;

[0035] Figure 24 for Figure 22 The perspective view of the support frame;

[0036] Figure 25 for Figure 20 The exploded view of the operating rod and connecting piece;

[0037] Figure 26 for Figure 20 The exploded view of the pressing rod and pressing piece;

[0038] Figure 27 for Figure 10 Fig. 1 is a top view of a first housing and a second housing in the middle of the application;

[0039] Figure 28 for Figure 27 Fig. 2 is a sectional view along the direction of B-B. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. If there are several embodiments, the features in these embodiments can be combined with each other when there is no conflict. When the description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise specified. The description in the following exemplary embodiments does not represent all the embodiments consistent with the present application; rather, they are only examples of devices, products and / or methods consistent with some aspects of the present application as recited in the claims of the present application.

[0041] The terms used in the present application are only for the purpose of describing the exemplary embodiments and are not intended to limit the scope of protection of the present application. The singular forms "a", "an" and "the" as used in the specification and claims of the present application are also intended to include the plural forms unless the context clearly indicates otherwise.

[0042] It should be understood that the use of terms such as "first", "second" and similar terms in the specification and claims of the present application do not denote any order, number or importance, but are only used to distinguish the features. Similarly, "one" or "a" and similar terms do not denote a quantity limitation, but denote the presence of at least one. Unless otherwise indicated, the terms "front", "back", "up", "down", and similar terms in the present application are only for the purpose of illustration and are not limited to a particular position or a spatial orientation. The terms "include" or "contain" and similar terms are an open-ended expression, meaning that the elements appearing before "include" or "contain" cover the elements appearing after "include" or "contain" and their equivalents, which does not exclude that the elements appearing before "include" or "contain" can also contain other elements. If "several" appears in the present application, it means two and more than two.

[0043] At present, the test technology for gas sensors is that the change in the gas concentration of the test chamber is longer than the actual response time of the gas sensitive material. Therefore, there is a large 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.

[0044] To this end, the present application provides a sensor test system for testing the response time of a gas sensor, as shown inFigures 1 to 28 The testing device 10, the gas supply device 20, the vacuum device 30 and the testing circuit 40, the testing device 10 comprises a gas chamber 200, the vacuum device 30 is used for vacuumizing the gas chamber 200, and the gas supply device 20 is used for supplying the gas chamber 200 with the gas to be tested.

[0045] Referring to Figure 2 and Figure 6 , the testing device 10 comprises a casing 1, a sealing device 2 arranged in the casing 1, a receiving component 3 and a driving component 4, a sealing space surrounded by the sealing device 2 is the gas chamber 200, and the receiving component 3 comprises a receiving cavity 301 for placing the sensor 50 to be tested.

[0046] In the embodiment shown in the application, the receiving component 3 is arranged in the gas chamber 200. The receiving component 3 is connected with the driving component 4, and the driving component 4 is used for controlling the receiving cavity 301 to be in communication or isolation with the gas chamber 200. When vacuumizing, the driving component 4 controls the receiving cavity 301 to be opened, so as to ensure that the receiving cavity 301 is in a vacuum state after being sealed, thereby reducing air interference. When the vacuumizing is completed, the driving component 4 controls the receiving cavity 301 to be sealed. At this time, the receiving cavity 301 cannot be in gas communication with the gas chamber 200. The gas chamber 200 is supplied with the gas to be tested. After the gas parameter is stable, the driving component 4 controls the receiving cavity 301 to be opened, so as to enable the sensor 50 to be tested to be in rapid contact with the gas to be tested. Thus, the response time of the gas sensor can be tested, and the testing efficiency and the measurement accuracy are high.

[0047] As shown in Figure 3 , the casing 1 is provided with a support table 11, and the sealing device 2 is arranged on the support table 11. As shown in Figure 7 , the sealing device 2 can be opened or sealed. When the sensor 50 to be tested needs to be placed or taken out, the sealing device 2 is opened. When the response time of the sensor 50 to be tested needs to be tested, the sealing device 2 is adjusted to be in a sealed state.

[0048] Referring to Figure 7 , the sealing device 2 comprises a bottom shell 21, a sealing cover 22 matched with the bottom shell 21 and a pressing assembly 23. The bottom shell 21 and the sealing cover 22 are located 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 sealed connection with the bottom shell 21.

[0049] As shown in Figure 1As shown, the gas supply device 20 comprises a first pipe 400 connected with the testing device 10, the first pipe 400 having a first channel, at least part of the first channel being in communication with the gas chamber 200. The vacuum device 30 comprises a second pipe 500 connected with the testing device 10, the second pipe 500 having a second channel, at least part of the second channel being in communication with the gas chamber 200.

[0050] The vacuum device 30 further comprises a vacuum pump (not shown) connected with the second pipe 500. Before testing, the vacuum pump performs vacuumization on the gas chamber 200, after the vacuumization is completed, the receiving cavity is sealed, and then the to-be-tested gas is introduced into the gas chamber 200 through the gas supply device 20, and after the pressure is constant, the to-be-tested sensor 50 is tested. As shown in Figure 1 and Figure 4 As shown, the gas supply device 20 further comprises 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 arranged on the first pipe 400, and / or the testing device 10 further comprises a pressure gauge 201 arranged on and connected with the bottom shell 21. The pressure gauge 201 is used to test the pressure of the gas chamber 200. In other embodiments, the pressure gauge 201 is arranged on and connected with the sealing cover 22.

[0051] Specifically, as shown in Figure 11 The bottom shell 21 is provided with a first through port 202 and a second through port 203, the gas supply device 20 is connected with the first through port 202 through a pipe, and the vacuum device 30 is connected with the second through port 203 through a pipe. The first through port 202 and the second through port 203 are arranged on the peripheral wall surface of the bottom shell 21.

[0052] In the embodiment shown in the present application, the bottom shell 21 is a cylindrical structure with an open upper end, which is convenient for forming. Of course, in other embodiments, the bottom shell 21 can also be a square cylindrical structure, a hexagonal cylindrical structure, etc.

[0053] The bottom shell 21 and the sealing cover 22 are detachably connected through fasteners. Specifically, as shown in Figure 11 The sealing cover 22 is provided with a first through hole 221, and the upper end edge of the bottom shell 21 forms a first flange 211, the first flange 211 is provided with a threaded hole 2111, and the first flange 211 is fixed with the sealing cover 22 through bolts or screws, the bolts or screws being fastened through the first through hole 221 of the sealing cover 22 and the threaded hole 2111. In addition, the lower end of the peripheral wall of the bottom shell 21 is provided with a second flange 212, and the second flange 212 is detachably mounted with the support table 11 of the casing 1 through screws or bolts.

[0054] Continuing to refer to Figure 11The first flange 211 is provided with a positioning portion 2112, and the sealing cover 22 is provided with a positioning hole 222. During assembly, the sealing cover 22 is arranged on the bottom shell 21, and the positioning portion 2112 passes through the positioning hole 222 to achieve the positioning effect. The positioning portion 2112 has a cylindrical structure, and the upper end of the cylindrical structure is provided with a chamfer. In this way, the sealing cover 22 and the first flange 211 of the bottom shell 21 can be positioned and assembled.

[0055] A sealing ring (not shown) is arranged between the first flange 211 and the sealing cover 22. The sealing ring is an O-shaped ring with a trapezoidal cross section, which improves the sealing performance of the gas chamber 200 and prevents gas leakage. Specifically, refer to Figure 11 The first flange 211 is provided with a second sealing groove 2113 on the end face. The second sealing groove 2113 is an annular groove. The positioning portion 2112 and the screw hole 2111 are located on the periphery of the second sealing groove 2113. The sealing cover 22 presses the sealing ring in the second sealing groove 2113, and the sealing cover 22 is locked with the bottom shell 21 by bolts or screws. The sealing cover 22 is provided with a handle 223. The handle 223 is symmetrically arranged in two parts, which is convenient for taking and placing.

[0056] The pressing assembly 23 is arranged in at least two groups. Refer to Figure 7 and Figure 20 Each group of pressing assemblies 23 includes a support 231, a pressing rod 232 rotatably connected to the support 231, a pressing piece 233 arranged on the pressing rod 232, a connecting piece 234 rotatably connected to the pressing rod 232, and a control rod 235. The upper end of the connecting piece 234 is rotatably connected to the upper end of the control rod 235. The lower end of the connecting piece 234 is rotatably connected to another connection point of the pressing rod 232. The lower end of the control rod 235 is rotatably connected to another connection point of the support 231. When the control rod 235 rotates around the support 231 away from the sealing cover 22, the support 231 drives the pressing rod 232 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 removed from the bottom shell 21, which is convenient for taking out or placing the sensor 50 to be tested. When the control rod 235 rotates around the support 231 towards the sealing cover 22, the pressing piece 233 gradually presses the sealing cover 22 on the bottom shell 21, and the gas chamber 200 is in a closed state.

[0057] Refer to Figure 22 The support 231 is provided with a first hinge shaft 2311 and a first connecting hole 2312. The first hinge shaft 2311 is located on the outer side of the upper end of the first connecting hole 2312. Specifically, in the horizontal direction, the distance between the first hinge shaft 2311 and the sealing device 2 is greater than the distance between the first connecting hole 2312 and the sealing device 2. In the vertical direction, the first hinge shaft 2311 is located at the upper end of the first connecting hole 2312. Figure 20 The following defines the positional relationship between the components when the pressing assembly 23 is in the pressing state. Refer toFigures 20 to 26 The pressing rod 232 is provided with a second connecting hole 2321 and a third connecting hole 2322, the second connecting hole 2321 is located outside the third connecting hole 2322, and the pressing rod 232 is hinged with the first hinge shaft 2311 of the support 231 through the second connecting hole 2321. The connecting piece 234 is provided with a fourth connecting hole 2341 and a second hinge shaft 2342, the fourth connecting hole 2341 is located at the upper end of the second hinge shaft 2342, the operating rod 235 is provided with a third hinge shaft 2351 and a fourth hinge shaft 2352, the third hinge shaft 2351 is located at the upper end of the fourth hinge shaft 2352, the operating rod 235 is hinged with the fourth connecting hole 2341 of the connecting piece 234 through the third hinge shaft 2351, and the operating rod 235 is hinged with the first connecting hole 2312 of the support 231 through the fourth hinge shaft 2352. The connecting piece 234 is hinged with the pressing rod 232 through the second hinge shaft 2342.

[0058] Referring to Figure 22 One side surface of the support 231 is provided with a retaining part 2301, the retaining part 2301 is used for supporting the operating rod 235 in a non-pressing state. The retaining part 2301 is located below the first hinge shaft 2311 and outside the first connecting hole 2312. The retaining part 2301 is a long rectangular body structure inclined to the horizontal plane.

[0059] Continuously referring to Figure 22 The support 231 comprises a bracket 2302 and a base 2303, the bracket 2302 is fixed on the base 2303, the base 2303 is fixed on the support table 11 of the shell 1, and the first hinge shaft 2311 and the first connecting hole 2312 are arranged on the bracket 2302. Referring to Figure 22 、 Figure 23 The top end of the bracket 2302 is provided with a recess 100, the recess 100 provides a rotating space for the connecting piece 234. The recess 100 comprises an inclined surface 101 and an arc surface 102 recessed into the bracket 2302, the inclined surface 101 is inclined from the first hinge shaft 2311 to the first connecting hole 2312, the lower end surface of the connecting piece 234 is matched with the arc surface 102 of the recess 100, and the side surface of the connecting piece 234 is matched with the inclined surface 101 when the connecting piece 234 is rotated to the position of the inclined surface 101.

[0060] Referring to Figure 24 The bracket 2302 comprises two first plate parts 23021 in L shape and a first connecting part 23022 connecting the two first plate parts 23021, the two first plate parts 23021 are arranged symmetrically with a spacing, and the first connecting part 23022 connects the inner sides of the two first plate parts 23021. The retaining part 2301 is arranged on one of the first plate parts 23021, and the first hinge shaft 2311 of the support 231 passes through one of the first plate parts 23021, the second connecting hole 2321 and the other first plate part 23021 in sequence.

[0061] Referring to Figure 26 , the pressing rod 232 comprises a ring-shaped part 2323 and a second plate part 2324 extending outward from one end of the ring-shaped part 2323, and the second connecting hole 2321 and the third connecting hole 2322 are arranged on the second plate part 2324. The pressing part 233 is fixed on the ring-shaped part 2323. The axes of the first connecting hole 2312, the second connecting hole 2321, the third connecting hole 2322 and the fourth connecting hole 2341 are parallel to each other. The pressing part 233 comprises a pressing part 2331 and a shaft-shaped part 2332 connected to the top end of the pressing part 2331, and the pressing part 2331 and the shaft-shaped part 2332 can be integrally formed. At least a part of the outer surface of the shaft-shaped part 2332 is provided with external threads, the shaft-shaped part 2332 penetrates through the ring-shaped part 2323, and the external threads of the shaft-shaped part 2332 are engaged with the nut 2333, thereby locking the shaft-shaped part 2332 and the ring-shaped part 2323.

[0062] In the embodiment shown in the present application, the entire surface of the shaft-shaped part 2332 is provided with external threads, referring to Figure 21 and Figure 26 , the upper and lower ends of the shaft-shaped part 2332 are locked with the ring-shaped part 2323 through the nut 2333, and the fixed position of the shaft-shaped part 2332 in the ring-shaped part 2323 can be adjusted by tightening the upper and lower screws, thereby adjusting the distance between the pressing part 2331 and the sealing cover 22.

[0063] Referring to Figure 26 , a gasket 2334 is further arranged between each nut 2333 and the ring-shaped part 2323, and the gasket 2334 is sleeved on the shaft-shaped part 2332. The gasket 2334 can be circular, square, hexagonal or the like. In the embodiment shown in the present application, the gasket 2334 is circular, and a pair of bent parts 2335 are symmetrically arranged on the gasket 2334. The bent part 2335 is a flat plate bent perpendicularly from the edge of the gasket 2334. The gasket 2334 is tightly attached to the surface of the ring-shaped part 2323, and the flat plate is tightly attached to the side surface of the ring-shaped part 2323. By arranging the bent part 2335, the contact area between the gasket 2334 and the ring-shaped part 2323 is increased, the connection stability of the shaft-shaped part 2332 and the ring-shaped part 2323 is improved, and the shaft-shaped part 2332 is prevented from shaking in the horizontal direction.

[0064] The pressing part 2331 comprises an upper part and a lower part. The upper part is a circular truncated cone structure with a diameter gradually increasing from the shaft-shaped part 2332 to the lower part. The lower part is a circular truncated cone structure with a diameter gradually decreasing from the upper part to the outside. The thickness of the lower part is greater than that of the upper part.

[0065] In the embodiment shown in the drawings, the annular member 2323 is a long strip-shaped annular structure, and the pressing portion 2331 is adjustable in position on the long strip-shaped annular structure, that is, the distance of the pressing portion 2331 from the center position of the sealing cover 22 can be adjusted.

[0066] Referring to Figure 21 , the operating rod 235 comprises an inverted U-shaped member 2353 and an operating member 2354 fixed to the upper end of the U-shaped member 2353, and the third hinge shaft 2351 of the operating rod 235 passes through one of the plate bodies of the U-shaped member 2353, the fourth connecting hole 2341 of the connecting member 234 and the other plate body of the U-shaped member 2353 in sequence. The fourth hinge shaft 2352 of the operating rod 235 passes through one of the plate bodies of the U-shaped member 2353, the first connecting hole 2312 of the support 231 and the other plate body of the U-shaped member 2353 in sequence.

[0067] Referring to Figure 25 , the U-shaped member 2353 comprises an inner connecting end 2355, an outer connecting end 2356 and a middle region 2357 connecting the inner connecting end 2355 and the outer connecting end 2356. The middle region 2357 is outwardly expanded relative to the inner connecting end 2355 and the outer connecting end 2356, and the space in the middle region 2357 is increased to avoid interference between the middle region 2357 and the bracket 2302. The third hinge shaft 2351 is located at the inner connecting end 2355, and the fourth hinge shaft 2352 is located at the outer connecting end 2356.

[0068] Continuing to refer to Figure 25 , the connecting member 234 comprises two third plate portions 2343 arranged at intervals and a second connecting portion 2344 connecting the inner sides of the two third plate portions 2343. The second hinge shaft 2342 of the connecting member 234 passes through one of the third plate portions 2343, the third connecting hole 2322 of the pressing rod 232 and the other third plate portion 2343 in sequence. The upper end of the second connecting portion 2344 is provided with a bent plate portion 2345.

[0069] In the embodiment shown in the drawings, the pressing assembly 23 is provided in three groups, and the three groups of pressing assemblies 23 are uniformly distributed on the outer periphery of the sealing device 2 to ensure that the sealing cover 22 is balanced in force. In other embodiments, the pressing assembly can be provided in two groups, which is not limited here.

[0070] Referring to Figure 8The housing component 3 comprises a first housing 31 and a second housing 32, and the driving component 4 is connected with the first housing 31. The driving component 4 controls the first housing 31 to separate from the second housing 32. When the first housing 31 separates from the second housing 32, there is a gap between the first housing 31 and the second housing 32, the accommodation cavity 301 is communicated with the gas chamber 200, and / or the driving component 4 is used to control the first housing 31 to close the second housing 32, and when the first housing 31 closes the second housing 32, the accommodation cavity 301 forms a sealed cavity, and the sealed cavity is isolated from the gas chamber 200.

[0071] In the embodiment shown in 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 can separate or close each other along the height direction Z of the test device 10. That is, the driving component 4 controls the first housing 31 to move relative to the second housing 32 along the height direction Z of the test device 10.

[0072] When the driving component 4 controls the first housing 31 and the second housing 32 to separate, the sensor to be tested 50 is exposed to the gas chamber 200; when the driving component 4 controls the first housing 31 and the second housing 32 to close, the first housing 31 and the second housing 32 enclose a sealed accommodation cavity 301.

[0073] In the embodiment shown in the present application, the first housing 31 and the second housing 32 are both in the form of a flat plate. Referring to Figure 10 and Figure 13 , the flat plate structure of the first housing 31 is provided with a first recess 311, and the second housing 32 is provided with a second recess 323. The first recess 311 has a first opening 600, and the second recess 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 accommodation cavity 301 comprises the first recess 311 and the second recess 323. After the first housing 31 separates from the second housing 32, a part of the sensor to be tested 50 is exposed outside the second recess 323 of the second housing 32, and can be in contact with the gas in the gas chamber 200 in time.

[0074] As shown in Figure 16 and Figure 17 , the first recess 311 comprises a first groove body 312 and a second groove body 313. Referring to Figure 28, the first shell 31 has a first end face 310, the first end face 310 coincides with the surface where the first opening 600 is located. The distance between the bottom surface of the first groove body 312 and the plane where the first end face 310 is located is H1, the distance between the bottom surface of the second groove body 313 and the plane where the first end face 310 is located is H2, and H2>H1. The first groove body 312 and the second groove body 313 have coplanar first side walls 314, the distance between the two first side walls 314 is the width of the first groove body 312, and the width direction W-W of the first groove body 312 and the second groove body 313 is consistent and the width value is equal.

[0075] Referring to Figure 18 and Figure 19 , the second groove 323 includes a third groove body 324 and a fourth groove body 325, the third groove body 324 includes two second side walls 326, the two second side walls 326 extend along the length direction L-L of the second groove 323, and the two second side walls 326 are located on both sides of the third groove body 324. The positioning groove body 327 is recessed from the second side wall 326 to both sides, and the two positioning groove bodies 327 are symmetrically arranged, referring to Figure 15 , the to-be-measured sensor 50 is installed in the third groove body 324, and the to-be-measured sensor 50 is symmetrically provided with ear parts 501 at both ends, and the two ear parts 501 are located in the two positioning groove bodies 327. The to-be-measured sensor 50 further includes a socket part 502, and the socket part 502 extends to the fourth groove body 325. A part of the to-be-measured sensor 50 is located outside the third groove body 324, which is convenient for rapid contact with the to-be-measured gas. Referring to Figure 28The second shell 32 has a second end face 320 coinciding with the surface where the second opening 700 is located. The distance between the bottom surface of the third groove 324 and the plane where the second end face 320 is located is H3, and the distance between the bottom surface of the fourth groove 325 and the plane where the second end face 320 is located is H4, and H4>H3. When the first shell 31 and the second shell 32 are closed, the first end face 310 of the first shell 31 abuts against the second end face 320 of the second shell 32. The fourth groove 325 includes two third side walls 328 extending along the length direction L-L of the second groove 323, and the two third side walls 328 are located at two sides of the fourth groove 325. One of the third side walls 328 of the fourth groove 325 is coplanar with one of the second side walls 326 of the third groove 324. The other third side wall 328 of the fourth groove 325 is not coplanar with the other second side wall 326 of the third groove 324. The connection between the not-coplanar second side wall 326 and the third side wall 328 forms a step portion 329, and the to-be-tested sensor 50 abuts against the step portion 329 to prevent the to-be-tested sensor 50 from shaking. The distance between the two second side walls 326 is the width of the third groove 324, the distance between the two third side walls 328 is the width of the fourth groove 325, the width of the third groove 324 is greater than the width of the fourth groove 325, and the width of the first groove 312 is equal to the width of the third groove 324. The to-be-tested sensor 50 is arranged in the space formed by the first groove 312 and the third groove 324, and the fourth groove 325 is used for accommodating the plug of the test circuit 40.

[0076] A sealing ring (not shown) is arranged between the first shell 31 and the second shell 32. The sealing ring is an O-shaped ring with a trapezoidal cross section, and the sealing connection is formed by pressing the sealing ring between the two shells. Specifically, referring to Figure 19 The upper surface of the second shell 32 is provided with a first sealing groove 321, which is an annular groove and is located at the periphery of the second groove 323. The sealing ring is arranged in the first sealing groove 321.

[0077] The first shell 31 and the second shell 32 are located in the central region of the gas chamber 200. The driving component 4 is connected with the first shell 31 to control the height direction movement of the test device 10. Referring to Figure 8 The driving component 4 includes a gas cylinder 41 fixed with the sealing cover 22, and the gas cylinder 41 and the sealing cover 22 are sealingly arranged. As shown in Figure 8As shown, the lower end of the air cylinder 41 is fixed with a connecting ring 401, and the sealing cover 22 is provided with an annular sleeve 220, and the connecting ring 401 is fixedly installed in the annular sleeve 220. The air cylinder 41 comprises an output shaft 411, the output shaft 411 penetrates the sealing cover 22 and is connected with the first shell 31. The air cylinder 41 controls the first shell 31 to move up and down relative to the second shell 32, so as to realize the separation or closure between the first shell 31 and the second shell 32.

[0078] Further, continuing to refer to Figure 8 , the end of the output shaft 411 is connected with a fixing member 412, and the fixing member 412 is connected with the first shell 31. The connection between the fixing member 412 and the first shell 31 is provided with a stabilizing member 413, which is shown in Figure 9 , the stabilizing member 413 is provided with a U-shaped groove 4131, and the stabilizing member 413 is wrapped around the outer periphery of the fixing member 412 through the U-shaped groove 4131, so as to improve the connection stability of the fixing member 412 and the first shell 31, and prevent the first shell 31 from shaking during movement.

[0079] Continuing to refer to Figure 9 , the fixing member 412 comprises an integrally formed first part 4121 and a second part 4122, and the first part 4121 and the second part 4122 are both cylindrical and coaxial. The diameter of the first part 4121 is smaller than that of the second part 4122, and the second part 4122 is fixedly connected with the first shell 31. The U-shaped groove 4131 of the stabilizing member 413 is wrapped around the outer periphery of the second part 4122. The thickness of the stabilizing member 413 is greater than that of the second part 4122, and the stabilizing member 413 also wraps a part of the first part 4121.

[0080] In the embodiment shown in the present application, referring to Figure 8 , Figure 9 and Figure 12 , the second shell 32 is fixed to the inner bottom surface of the bottom shell 21. Referring to Figure 18The second shell 32 is provided with a mounting hole 300, and the inner bottom surface of the bottom shell 21 is provided with a threaded hole, and a bolt or screw is fixed through the mounting hole 300 and the threaded hole. The sensor testing system further comprises a guide frame 415 fixed at the bottom of the sealing cover 22. The guide frame 415 comprises a top plate 4151 and at least two guide rods 4152 fixed on 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. The two guide rods 4152 pass through the first shell 31, and the second shell 32 is fixed to the bottom shell 21, and the guide rods 4152 serve as positioning. Specifically, the first shell 31 is provided with a connecting lug 302, and the connecting lug 302 is provided with a second through hole 303, and the guide rod 4152 passes through the second through hole 303 correspondingly. Specifically, the top plate 4151 is symmetrically provided with two guide rods 4152, and the first shell 31 is correspondingly provided with two connecting lugs 302, and each connecting lug 302 is provided with a second through hole 303.

[0081] The sealing cover 22 can be manually removed from the upper end of the bottom shell 21, or can be set in an automatic control mode. For example, the handle 223 of the sealing cover 22 is connected to a rope, and the other end of the rope is connected to a recycling device. By recycling the rope through the recycling device, the sealing cover 22 is moved upward relative to the bottom shell 21.

[0082] Referring to Figure 4 , Figure 5 The testing device further comprises a support frame 5 beside the sealing device 2. When the sensor 50 to be tested is taken out or placed, the sealing device 2 is opened, and the sealing cover 22 is placed on the support frame 5 to support the sealing cover 22. The support frame 5 comprises two frame bodies 51 arranged at intervals, and the sealing cover 22 is placed on the top ends of the two frame bodies 51.

[0083] Referring to Figure 14 The end of the second shell 32 is further provided with a third through hole 322 for the wire to pass through. The test circuit 40 comprises a wire and an inductance tester. The inductance tester is connected to the sensor 50 to be tested through the wire. When detection is needed, the output shaft 411 of the air cylinder 41 is retracted, the output shaft 411 drives the first shell 31 to move upward 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, and the inductance tester records the parameter change of the sensor 50 to be tested during testing. After analysis, the response time of the sensor 50 to be tested can be obtained.

[0084] The gas sensor response time testing method of the application: the sensor 50 to be tested is placed in the second shell 32; the sensor 50 to be tested is connected with the testing circuit 40, it is confirmed that the first shell 31 and the second shell 32 are in the separated state, the vacuumizing device 30 carries out vacuumizing to the gas chamber 200, after the vacuumizing is finished, the cylinder 41 controls the first shell 31 to move downward and is closed with the second shell 32, the gas supply device 20 fills the gas to be tested into the gas chamber 200, after filling is finished, the first shell 31 is lifted upward, 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, then after analysis, the response time performance parameter of the sensor to be tested can be obtained.

[0085] In summary, the sensor testing system of the application has the following advantages:

[0086] 1. Before the gas to be tested is introduced, the gas chamber 200 and the containing cavity 301 are vacuumized first to avoid other gas interference, and the gas to be tested is introduced under vacuum to realize controllable gas concentration.

[0087] 2. The sensor 50 to be tested is exposed to the gas atmosphere to be tested at the moment when the containing cavity 301 is opened, the gas to be tested is rapidly diffused to the surface of the sensor 50 to be tested, the delay time is reduced, and the measurement accuracy is high.

[0088] 3. The opening and closing of the containing cavity 301 are automatically controlled to avoid the influence of human operation.

[0089] 4. The testing time is short, and the work efficiency is high.

[0090] The above embodiments are only used for describing the application and not limiting the technical solutions described in the application, and the understanding of the specification should be based on the technical personnel in the art, although the application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical personnel in the art can still modify or equivalently replace the application, and all technical solutions and improvements that do not deviate from the spirit and scope of the application should be covered in the scope of the claims of the application.

Claims

1. A sensor testing system, characterized in that, Includes testing equipment, gas supply equipment, and vacuum pumping equipment; The testing device has a gas chamber, and includes a housing component and a driving component. The housing component is located inside the gas chamber and has a housing cavity for placing the sensor under test. The driving component is connected to the housing component and is used to control the housing cavity to communicate with or isolate from the gas chamber. The gas supply device includes a first pipe connected to the testing device, the first pipe having a first channel, at least a portion of the first channel communicating with the gas chamber; The vacuum pumping device is used to evacuate the gas chamber. The vacuum pumping device includes a second pipe connected to the testing device. The second pipe has a second channel, at least a portion of which is in communication with the gas chamber. During vacuuming, the driving component controls the receiving cavity to open. After vacuuming ends, the driving component controls the receiving cavity to close, preventing gas communication between the receiving cavity and the gas chamber. The gas to be tested is introduced into the gas chamber. Once the gas parameters stabilize, the driving component controls the receiving cavity to open, allowing the sensor to be tested to quickly come into contact with the gas.

2. The sensor testing system according to claim 1, characterized in that, The housing component includes a first housing and a second housing. The driving component is connected to the first housing and is used to drive the first housing to move, thereby separating or closing the first housing from the second housing. When the first housing is separated from the second housing, there is a gap between the first housing and the second housing, and the receiving cavity is in communication with the gas chamber; When the first housing and the second housing are closed, the receiving cavity forms a sealed cavity, which is isolated from the gas chamber.

3. The sensor testing system according to claim 2, characterized in that, The drive component is used to control the distance the first housing moves relative to the second housing.

4. The sensor testing system according to claim 3, characterized in that, The first housing has a first groove, the second housing has a second groove, the first groove has a first opening, the second groove has a second opening, the first opening faces the second housing, the second opening faces the first housing, and the receiving cavity includes the first groove and the second groove.

5. The sensor testing system according to claim 4, characterized in that, The first groove includes a first groove and a second groove. The first housing has a first end face, which coincides with the surface where the first opening is located. The distance between the bottom surface of the first groove and the plane where the first end face is located is H1, and the distance between the bottom surface of the second groove and the plane where the first end face is located is H2, and H2 > H1. The second groove includes a third groove and a fourth groove. The second housing has a second end face, which coincides with the surface where the second opening is located. The distance between the bottom surface of the third groove and the plane where the second end face is located is H3, and the distance between the bottom surface of the fourth groove and the plane where the second end face is located is H4, and H4 > H3.

6. The sensor testing system according to claim 2, characterized in that, The testing device includes a bottom shell, a sealing cover matching the bottom shell, and a clamping assembly. The bottom shell and the sealing cover are both located around the gas chamber. The clamping assembly has a clamping state. When the clamping assembly is in the clamping state, the clamping assembly abuts against at least one of the sealing cover and the bottom shell, and the sealing cover is sealed to the bottom shell.

7. The sensor testing system according to claim 1, characterized in that, The gas supply device also includes a flow meter, which is installed in the first pipeline. The testing device includes a bottom shell, a sealing cover matching the bottom shell, and a pressure gauge. The pressure gauge is used to test the pressure of the gas chamber and is connected to the bottom shell or the sealing cover.

8. The sensor testing system according to claim 6, characterized in that, The driving component includes a cylinder, which is fixed to the sealing cover and sealed to the sealing cover. The cylinder includes an output shaft that passes through the sealing cover and is connected to the first housing.

9. The sensor testing system according to claim 8, characterized in that, The sensor testing system also includes a guide frame, which includes a top plate and at least two guide rods. The at least two guide rods are fixed to the top plate, and the top plate is fixed to the sealing cover. The two guide rods pass through the first housing, and the second housing is fixed to the bottom housing.

10. The sensor testing system according to claim 6, characterized in that, The clamping assembly includes a support, a clamping rod, a clamping component, a connector, and a control lever. The clamping rod is rotatably connected to the support, the clamping component is connected to the clamping rod, the connector is rotatably connected to the clamping rod, the upper end of the connector is rotatably connected to the upper end of the control lever, the lower end of the connector is rotatably connected to another connection point of the clamping rod, and the lower end of the control lever is rotatably connected to another connection point of the support.

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