Testing device of chip type gas sensor

Abstract

The invention provides a testing device for a tablet core type gas sensor. The testing device comprises a T-shaped pipe, a gas inlet joint, a tablet core fixing disc, a gas outlet joint and a supporting base, the T-shaped pipe is provided with a front pipe orifice, a rear pipe orifice and a bypass pipe orifice, a first pipe orifice sealing seat is arranged at the front pipe orifice, a second pipe orifice sealing seat is arranged at the rear pipe orifice, and a bypass sealing seat is arranged at the bypass pipe orifice, so that a test cavity is formed in the T-shaped pipe; the air inlet connector is connected to the bypass sealing seat in a sealed mode. The chip core fixing disc is connected to the first pipe opening sealing seat in a sealed mode, a positioning insertion hole is formed in the chip core fixing disc, the gas sensor is inserted and fixed into the positioning insertion hole, the testing end of the gas sensor is arranged in the testing cavity, the wiring end of the gas sensor is arranged outside the testing cavity, and a sealing part is arranged on the chip core fixing disc; the air outlet joint is hermetically connected to the second pipe orifice sealing seat; the supporting base is arranged below the T-shaped pipe and used for supporting the T-shaped pipe. According to the device, the testing precision and efficiency of the chip type gas sensor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor testing equipment, and in particular to a testing device for a chip-type gas sensor. Background Art

[0002] With the rapid development of intelligent automobile technology, the demand for automotive gas sensors is growing, especially in the field of nitrogen oxide monitoring, where the chip-type three-cavity structure chip has become the mainstream design. However, in the process of laboratory development, the traditional test method uses a cork plus a T-tube, which has many problems that need to be solved. First, ordinary corks cannot accurately control the insertion position of the core, resulting in the core being in an unfixed position in the test cavity, which is prone to leaking and introducing human operation errors, affecting the test accuracy. Secondly, the poor adaptability of the traditional circular sealing hole and the square core aggravates the problem of insufficient sealing, which may cause gas leakage or external gas infiltration, interfering with the test results. In addition, although the existing test system can meet the test requirements of various specifications of cores such as four-wire, six-wire, and eight-wire, the operation is complicated and inconvenient, and the frequent replacement of the adapter increases the tediousness and time cost of the test. At the same time, although the current test device supports applying electrical signals to the core to verify its response characteristics, due to the lax sealing and the unfixed position of the core, electrical interference or poor contact may be introduced, resulting in deviations in the test results. These problems not only reduce the R&D efficiency and test accuracy, but also increase the uncertainty and cost in the R&D process. Therefore, it is urgent to develop a more accurate, flexible and universal testing solution through technological improvements to meet the increasingly complex R&D needs and promote the further development of automotive gas sensor technology. Summary of the invention

[0003] The technical problem to be solved by the present invention is that the sensor test positioning and sealing are poor, which affects the test accuracy. In order to overcome the above defects of the prior art, the present invention provides a test device for a chip-type gas sensor.

[0004] The present invention provides a testing device for a chip-type gas sensor, comprising a T-tube, an air inlet joint, a chip-type fixing plate, an air outlet joint and a supporting base; the T-tube is provided with a front pipe opening, a rear pipe opening and a bypass pipe opening which are interconnected, the front pipe opening is provided with a first pipe opening sealing seat, the rear pipe opening is provided with a second pipe opening sealing seat, and the bypass pipe opening is provided with a bypass sealing seat, so that a test cavity for testing the gas sensor is formed in the T-tube; the air inlet joint is sealingly connected to the bypass sealing seat, and the air inlet joint is connected to an external air supply pipe and is used for supplying air to the test cavity; The core fixing disk is sealingly connected to the first pipe mouth sealing seat, and a positioning hole is provided on the core fixing disk. The positioning hole is used for inserting and fixing the gas sensor, so that the test end of the gas sensor is placed in the test cavity and the connection end of the gas sensor is placed outside the test cavity. A sealing component is provided on the core fixing disk, and the sealing component is used to seal the gas sensor in the positioning hole; the gas outlet joint is sealingly connected to the second pipe mouth sealing seat, and the gas outlet joint is used to discharge the gas in the test cavity; the support base is arranged below the T-tube and is used to support the T-tube.

[0005] Compared with the prior art, the test device of a core-type gas sensor provided by the present application has the following significant advantages: First, the device sets sealing seats at the three nozzles of the T-tube respectively, wherein the sealing seat for fixing the core adopts a square design, which is perfectly adapted to the square core, has better sealing performance, can provide a more stable and leak-free test environment, and significantly improves the test accuracy. The sealing seats of the other two nozzles are circular in design to ensure the stability and versatility of the overall structure. Secondly, the device takes in air from the bypass nozzle on the side, can quickly switch the test atmosphere, and directly align the sensitive electrode of the core, so that the response speed of the gas sensor is faster, significantly improving the test efficiency. This design not only realizes real-time atmosphere testing, but also can flexibly simulate different gas environments, providing more comprehensive test conditions for the performance evaluation of the core. In addition, the device is equipped with a core fixing plate with a positioning jack, which can accurately fix the installation position of the square core, ensuring that the position of the core is almost the same during each test, and minimizing the error introduced by different installation positions. By adjusting the positioning position, the device can flexibly adapt to square cores of different lengths. Whether it is a shorter or longer core, it can achieve efficient and accurate testing, demonstrating its high practicality. The outstanding advantages of this device are its excellent sealing and rapid gas flow capabilities. It is also compatible with cores of various specifications such as four-wire, six-wire, and eight-wire to meet diverse testing needs. These innovative designs give this device significant technical advantages and application value in the testing of core-type gas sensors.

[0006] In a possible implementation manner, the sealing component includes a sealing ring, a pressure ring and a locking screw. The sealing ring is sleeved on the gas sensor, and the pressure ring squeezes the sealing ring into the positioning socket through the locking screw.

[0007] Compared with the prior art, the above technical solution can seal the gas sensor in the positioning socket, thereby improving the sealing performance of the test cavity.

[0008] In a possible implementation manner, the core fixing disk is provided with an annular groove for inserting a sealing ring, the annular groove is in an outward-octagonal inclined structure, and the annular groove is connected to the positioning socket.

[0009] Compared with the prior art, the above technical solution can stabilize the setting of the sealing ring and improve the sealing reliability of the sealing ring.

[0010] In a possible embodiment, a first sealing sleeve is sleeved on the front pipe opening, a first annular groove for inserting the first sealing sleeve is provided on the first pipe opening sealing seat, a second sealing sleeve is sleeved on the rear pipe opening, a second annular groove for inserting the second sealing sleeve is provided on the second pipe opening sealing seat, a pulling assembly is provided between the first pipe opening sealing seat and the second pipe opening sealing seat, and the pulling assembly is used to squeeze both the first pipe opening sealing seat and the second pipe opening sealing seat toward the T-shaped tube.

[0011] Compared with the prior art, the above technical solution can realize the sealing of the front pipe opening by the first pipe opening sealing seat and the sealing of the rear pipe opening by the second pipe opening sealing seat, thereby improving the sealing stability of the test cavity.

[0012] In a possible embodiment, a first annular sealing groove is provided on the core fixing disk, a first sealing ring is provided in the first annular sealing groove, a first clamp is provided between the core fixing disk and the first pipe mouth sealing seat, and the first clamp is used to squeeze the first sealing ring onto the first pipe mouth sealing seat; a second annular sealing groove is provided on the air outlet joint, a second sealing ring is provided in the second annular sealing groove, a second clamp is provided between the air outlet joint and the second pipe mouth sealing seat, and the second clamp is used to squeeze the second sealing ring onto the second pipe mouth sealing seat.

[0013] Compared with the prior art, the above technical solution can achieve the sealing between the core fixing plate and the first pipe opening sealing seat, and the sealing between the air outlet joint and the second pipe opening sealing seat, and the sealing is stable and reliable.

[0014] In a possible embodiment, the pulling assembly includes a plurality of pulling screws, both ends of which pass through the first pipe mouth sealing seat and the second pipe mouth sealing seat respectively and are screwed with nuts, and the nuts at both ends of the pulling screw squeeze and lock the first pipe mouth sealing seat and the second pipe mouth sealing seat relative to each other.

[0015] Compared with the prior art, the above technical solution can ensure that the first pipe opening sealing seat and the second pipe opening sealing seat can extrude the T-tube stably, thereby improving the sealing reliability.

[0016] In a possible embodiment, the support base includes two bracket plates and a plurality of connecting screws, the two bracket plates are connected to the two ends of the plurality of connecting screws, the upper ends of the two bracket plates are provided with a U-shaped groove, the U-shaped groove is for the pulling screw to be inserted, and the nut is pressed against the bracket plate.

[0017] Compared with the prior art, the above technical solution can facilitate the assembly of the support base and facilitate testing and use.

[0018] In a possible implementation manner, the T-tube is made of a transparent material.

[0019] Compared with the prior art, the above technical solution can facilitate observation of the position where the gas sensor enters the test chamber, so that the test end of the gas sensor can be quickly aligned with the bypass pipe opening, thereby improving test efficiency and accuracy.

[0020] In a possible implementation manner, a wiring harness interface is provided at one end of the chip fixing plate facing away from the T-tube, and the wiring harness interface is used for inserting the wiring terminals of the gas sensor.

[0021] Compared with the prior art, the above technical solution can facilitate the connection of the gas sensor with external equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 The structure of the present invention is schematically shown Figure 3 ; Figure 4 is a cross-sectional view of the present invention; Figure 5 for Figure 4 Partial enlargement Figure 1 ; Figure 6 for Figure 4 Partial enlargement Figure 2 ; Description of reference numerals: 1. T-tube; 11. front pipe opening; 12. rear pipe opening; 13. bypass pipe opening; 14. test chamber; 2. air inlet connector; 3. core fixing plate; 31. positioning jack; 32. ring groove; 33. first annular sealing groove; 34. wiring harness interface; 4. air outlet connector; 41. second annular sealing groove; 5. supporting base; 51. bracket plate; 52. connecting screw; 6. first pipe opening sealing seat; 61. first annular groove; 7. second pipe opening sealing seat; 71. second annular groove; 8. sealing component; 81. sealing ring; 82. pressure ring; 83. locking screw; 9. first sealing sleeve; 10. second sealing sleeve; 20. first sealing ring; 30. first clamp; 40. second sealing ring; 50. second clamp; 60. pulling screw; 601. nut; 100. gas sensor. DETAILED DESCRIPTION

[0023] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0024] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0025] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figures 1 to 6The embodiment of the present application discloses a testing device for a chip-type gas sensor, comprising a T-tube 1, an air inlet joint 2, a chip-type fixing plate 3, an air outlet joint 4 and a supporting base 5; the T-tube 1 is provided with a front pipe opening 11, a rear pipe opening 12 and a bypass pipe opening 13 which are interconnected, the front pipe opening 11 is provided with a first pipe opening sealing seat 6, the rear pipe opening 12 is provided with a second pipe opening sealing seat 7, and the bypass pipe opening 13 is provided with a bypass sealing seat, so that a test cavity 14 for testing a gas sensor 100 is formed in the T-tube 1; the air inlet joint 2 is sealedly connected to the bypass sealing seat, the air inlet joint 2 is connected to an external air supply pipe and is used for supplying air to the test cavity 14; the The core fixing disk 3 is sealingly connected to the first pipe mouth sealing seat 6, and a positioning hole 31 is provided on the core fixing disk 3. The positioning hole 31 is used for the gas sensor 100 to be inserted and fixed, so that the test end of the gas sensor 100 is placed in the test cavity 14 and the connection terminal of the gas sensor 100 is placed outside the test cavity 14. A sealing component 8 is provided on the core fixing disk 3, and the sealing component 8 is used to seal the gas sensor 100 in the positioning hole 31; the gas outlet joint 4 is sealingly connected to the second pipe mouth sealing seat 7, and the gas outlet joint 4 is used to discharge the gas in the test cavity 14; the support base 5 is arranged below the T-tube 1 and is used to support the T-tube 1.

[0028] Continue to see Figure 4 and Figure 5 In this embodiment, the sealing component 8 includes a sealing ring 81, a pressure ring 82 and a locking screw 83. The sealing ring 81 is sleeved on the gas sensor 100. The pressure ring 82 squeezes the sealing ring 81 into the positioning socket 31 through the locking screw 83, thereby sealing the gas sensor 100 in the positioning socket 31 and improving the sealing performance of the test chamber 14. In order to stably set the sealing ring 81, the core fixing plate 3 is provided with an annular groove 32 for the sealing ring 81 to be placed. The annular groove 32 is in an outward-octagonal inclined structure, and the annular groove 32 is connected to the positioning socket 31.

[0029] Continue to see Figure 5 and Figure 6In this embodiment, a first sealing sleeve 9 is sleeved on the front pipe opening 11, a first annular groove 61 for inserting the first sealing sleeve 9 is provided on the first pipe opening sealing seat 6, a second sealing sleeve 10 is sleeved on the rear pipe opening 12, a second annular groove 71 for inserting the second sealing sleeve 10 is provided on the second pipe opening sealing seat 7, a pulling component is provided between the first pipe opening sealing seat 6 and the second pipe opening sealing seat 7, and the pulling component is used to squeeze the first pipe opening sealing seat 6 and the second pipe opening sealing seat 7 toward the T-shaped tube 1, thereby realizing the sealing of the first pipe opening sealing seat 6 to the front pipe opening 11 and the sealing of the second pipe opening sealing seat 7 to the rear pipe opening 12, thereby improving the sealing stability of the test cavity 14. Specifically, the pulling assembly includes a plurality of pulling screws 60, the two ends of the pulling screw 60 respectively pass through the first pipe mouth sealing seat 6 and the second pipe mouth sealing seat 7 and are screwed with nuts 601. The nuts 601 at both ends of the pulling screw 60 squeeze and lock the first pipe mouth sealing seat 6 and the second pipe mouth sealing seat 7 relative to each other.

[0030] In this embodiment, a first annular sealing groove 33 is provided on the core fixing disk 3, a first sealing ring 20 is provided in the first annular sealing groove 33, a first clamp 30 is provided between the core fixing disk 3 and the first pipe mouth sealing seat 6, the first clamp 30 is used to squeeze the first sealing ring 20 onto the first pipe mouth sealing seat 6; a second annular sealing groove 41 is provided on the air outlet joint 4, a second sealing ring 40 is provided in the second annular sealing groove 41, a second clamp 50 is provided between the air outlet joint 4 and the second pipe mouth sealing seat 7, the second clamp 50 is used to squeeze the second sealing ring 40 onto the second pipe mouth sealing seat 7, thereby achieving sealing between the core fixing disk 3 and the first pipe mouth sealing seat 6, and sealing between the air outlet joint 4 and the second pipe mouth sealing seat 7, and the sealing is stable and reliable.

[0031] Continue to see Figure 1 In this embodiment, the support base 5 includes two bracket pieces 51 and a plurality of connecting screws 52. The two bracket pieces 51 are connected to the two ends of the plurality of connecting screws 52. The upper ends of the two bracket pieces 51 are provided with U-shaped grooves for the pulling screws 60 to be inserted. The nut 601 is pressed against the bracket piece 51, which can facilitate the assembly of the support base 5 and facilitate testing.

[0032] In this embodiment, the T-tube 1 is made of a transparent material, which facilitates observation of the position of the gas sensor 100 entering the test chamber 14, allowing the test end of the gas sensor 100 to quickly align with the bypass pipe opening 13, thereby improving test efficiency and accuracy.

[0033] In this embodiment, a wiring harness interface 34 is provided at one end of the core fixing plate 3 facing away from the T-tube 1 , and the wiring harness interface 34 is for inserting the wiring terminals of the gas sensor 100 , thereby facilitating the connection of the gas sensor 100 with external devices.

[0034] Compared with the prior art, the advantages of the present invention are: 1. Compared with the existing rubber plug sealing method, the present invention has outstanding advantages in air tightness. The present invention adopts a square sealing hole design, which is more compatible with the square core and has better sealing performance. It can provide a more stable and leak-free test environment and significantly improve the test accuracy.

[0035] 2. Compared with the existing rubber plug sealing method, the present invention is more accurate in core positioning. Through the cooperation of the core positioning plate and the pressure ring, the size of the core entering the test cavity 14 is limited by the core positioning, so that the installation position of the core can be almost the same each time, which minimizes the error introduced by the different chip installation positions and further improves the test accuracy.

[0036] 3. Compared with the existing T-tube 1 test chamber 14, the present invention is faster in air intake and ventilation speed. It takes in air from the bypass side, can quickly switch the test atmosphere, and the test atmosphere is directly aimed at the sensitive electrode, so that the response speed of the chip-type gas sensor is faster, which significantly improves the test efficiency. At the same time, the present invention supports real-time atmosphere testing and can flexibly simulate different gas environments.

[0037] 4. Compared with the traditional T-tube 1 which is suspended in the air, the test device of the present invention can be placed on a test bench, which can greatly reduce the error caused by vibration and make the test result more accurate.

[0038] 5. This test fixture can be disassembled separately, which is convenient for taking and placing sensor samples, greatly simplifying the installation process when the user is testing.

[0039] 6. The wiring harness interface designed by this invention is universal, not only supporting the commonly used eight-wire wiring harness connector, but also compatible with wiring harnesses of various specifications such as four-wire and six-wire, meeting diverse testing needs. At the same time, by adjusting the positioning position, the invention can flexibly adapt to cores of different lengths. Whether it is a short core or a long core, efficient and accurate testing can be achieved, showing its high practicality.

[0040] In the description of the embodiments of the present application, it should be noted that in the description of the present application, terms such as "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present application.

[0041] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A test device for a chip-type gas sensor, characterized in that: It comprises a T-shaped tube (1), an air inlet joint (2), a core fixing plate (3), an air outlet joint (4) and a supporting base (5); The T-shaped tube (1) is provided with a front tube opening (11), a rear tube opening (12) and a bypass tube opening (13) which are interconnected, the front tube opening (11) is provided with a first tube opening sealing seat (6), the rear tube opening (12) is provided with a second tube opening sealing seat (7), and the bypass tube opening (13) is provided with a bypass sealing seat, so that a test chamber (14) for testing a gas sensor (100) is formed in the T-shaped tube (1); The air inlet connector (2) is sealingly connected to the bypass sealing seat, and the air inlet connector (2) is connected to an external air supply pipe and is used to supply air to the test chamber (14); The core fixing disk (3) is sealingly connected to the first pipe opening sealing seat (6); a positioning hole (31) is provided on the core fixing disk (3); the positioning hole (31) is used for inserting and fixing the gas sensor (100), so that the test end of the gas sensor (100) is placed in the test cavity (14) and the connection end of the gas sensor (100) is placed outside the test cavity (14); a sealing component (8) is provided on the core fixing disk (3); the sealing component (8) is used to seal the gas sensor (100) in the positioning hole (31); The gas outlet joint (4) is sealingly connected to the second pipe opening sealing seat (7), and the gas outlet joint (4) is used to discharge the gas in the test cavity (14); The support base (5) is arranged below the T-shaped tube (1) and is used to support the T-shaped tube (1).

2. The chip-type gas sensor testing device according to claim 1, characterized in that: The sealing component (8) comprises a sealing ring (81), a pressure ring (82) and a locking screw (83); the sealing ring (81) is sleeved on the gas sensor (100); and the pressure ring (82) presses the sealing ring (81) into the positioning socket (31) through the locking screw (83).

3. The chip-type gas sensor testing device according to claim 2, characterized in that: The core fixing disk (3) is provided with an annular groove (32) for the sealing ring (81) to be placed therein, the annular groove (32) is in an outward octagonal inclined structure, and the annular groove (32) is connected to the positioning insertion hole (31).

4. The chip-type gas sensor testing device according to claim 1, characterized in that: The front pipe opening (11) is sleeved with a first sealing sleeve (9), the first pipe opening sealing seat (6) is provided with a first annular groove (61) for the first sealing sleeve (9) to be inserted into, the rear pipe opening (12) is sleeved with a second sealing sleeve (10), the second pipe opening sealing seat (7) is provided with a second annular groove (71) for the second sealing sleeve (10) to be inserted into, and a pulling assembly is provided between the first pipe opening sealing seat (6) and the second pipe opening sealing seat (7), and the pulling assembly is used to squeeze the first pipe opening sealing seat (6) and the second pipe opening sealing seat (7) toward the T-shaped pipe (1).

5. The chip-type gas sensor testing device according to claim 4, characterized in that: The core fixing disk (3) is provided with a first annular sealing groove (33), a first sealing ring (20) is provided in the first annular sealing groove (33), a first clamp (30) is provided between the core fixing disk (3) and the first pipe mouth sealing seat (6), the first clamp (30) is used to squeeze the first sealing ring (20) onto the first pipe mouth sealing seat (6); the air outlet joint (4) is provided with a second annular sealing groove (41), a second sealing ring (40) is provided in the second annular sealing groove (41), a second clamp (50) is provided between the air outlet joint (4) and the second pipe mouth sealing seat (7), the second clamp (50) is used to squeeze the second sealing ring (40) onto the second pipe mouth sealing seat (7).

6. The chip-type gas sensor testing device according to claim 4, characterized in that: The pulling assembly comprises a plurality of pulling screws (60), the two ends of the pulling screws (60) respectively passing through the first pipe mouth sealing seat (6) and the second pipe mouth sealing seat (7) and then being screwed with nuts (601). The nuts (601) at the two ends of the pulling screws (60) squeeze and lock the first pipe mouth sealing seat (6) and the second pipe mouth sealing seat (7) relative to each other.

7. The chip-type gas sensor testing device according to claim 6, characterized in that: The support base (5) comprises two bracket plates (51) and a plurality of connecting screw rods (52). The two bracket plates (51) are connected to the two ends of the plurality of connecting screw rods (52). The upper ends of the two bracket plates (51) are provided with U-shaped grooves for the pulling screw rods (60) to be inserted into the U-shaped grooves. The nuts (601) are tightly pressed against the bracket plates (51).

8. The chip-type gas sensor testing device according to claim 1, characterized in that: The T-shaped tube (1) is made of transparent material.

9. The chip-type gas sensor testing device according to claim 1, characterized in that: A wiring harness interface (34) is provided at one end of the core fixing plate (3) facing away from the T-tube (1), and the wiring harness interface (34) is used to insert the wiring terminal of the gas sensor (100).

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