A pipe connecting structure for motor vehicle exhaust detection

Abstract

The utility model discloses a kind of pipeline connection structures for motor vehicle exhaust detection, it is related to exhaust detection technical field, including exhaust pipe, the one end of exhaust pipe is provided with connecting assembly, the one end of connecting assembly is fixedly connected with air pipe away from exhaust pipe, connecting assembly includes butt joint pipe, the one end of butt joint pipe is movably inserted with the inner wall of the one end of exhaust pipe, the outer wall of the one end of butt joint pipe away from exhaust pipe is fixedly sleeved with fastening inner tube, the outer wall of the one end of fastening inner tube is fixedly sleeved with fastening sleeve, the one end of butt joint pipe is fixedly connected with extension pipe, the inner wall of extension pipe is provided with detection probe.The utility model is through the triple cooperation structure of " butt joint pipe inner insertion, fastening inner tube outer embrace and conical fastening sleeve extrusion", fastening inner tube can be closely combined with the outer wall of exhaust pipe of different diameters under the assistance of folding groove, effectively block exhaust leakage path, solve the problem of traditional structure sealing, guarantee the accuracy of detection data.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas detection technology, specifically to a pipe connection structure for motor vehicle exhaust gas detection. Background Technology

[0002] In the field of vehicle exhaust emission testing technology, the reliability of the exhaust emission sampling system's connection directly affects the accuracy of the test data and the efficiency of the testing operation. Existing exhaust emission testing pipe connection structures have several technical defects: Insufficient sealing of connections: Traditional connections often use simple sockets or single-threaded fixings without a dedicated sealing and fastening structure. Exhaust gas is prone to leaking from the connection, leading to sample gas dilution and affecting the accuracy of test results. This problem is particularly prominent under testing conditions that require strict sealing, such as dual idling speed. Poor compatibility and stability: Different vehicle models have different exhaust pipe diameters, and existing connection devices are difficult to adapt to multiple exhaust pipe specifications. Moreover, the fastening mechanism is mostly a rigid clamp, which is prone to loosening and falling off when the vehicle is idling and vibrating, resulting in interruption of the test. Insufficient ease of disassembly and assembly: Some connection structures are fixed with flange bolts or multiple sets of clamps, requiring multiple operations with the help of tools. The disassembly and assembly process is cumbersome, which greatly reduces the testing efficiency and is especially unsuitable for batch testing scenarios. The detection element lacks stability: the detection probe is often directly inserted into the exhaust pipe without a dedicated support and positioning structure. The airflow impact can easily cause the probe to shift, and the connection pipe between the probe and the external equipment has no fixing device, which can easily cause poor contact of the circuit due to pulling. To address the aforementioned issues, existing technologies have employed insert-type connection structures with flexible seals. However, these structures occupy the internal cross-sectional area of ​​the exhaust pipe, easily causing exhaust blockage, and lack reliable fastening devices, still posing a risk of detachment. Other connection devices using docking covers, while increasing flexibility, are bulky, inconvenient to move and adjust, and poorly adaptable to low-profile vehicles. Therefore, there is an urgent need for a pipe connection structure that combines sealing, adaptability, convenience, and stability to meet the stringent requirements of exhaust gas testing. Utility Model Content

[0003] The purpose of this utility model is to provide a pipe connection structure for motor vehicle exhaust emission testing, so as to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A pipe connection structure for motor vehicle exhaust emission testing includes an exhaust pipe, a connecting component is provided at one end of the exhaust pipe, and a vent pipe is fixedly connected to the end of the connecting component away from the exhaust pipe. The connecting assembly includes a connecting pipe, one end of which is movably inserted into the inner wall of one end of the exhaust pipe. A fastening inner tube is fixedly sleeved on the outer wall of the end of the connecting pipe away from the exhaust pipe. A fastening sleeve is fixedly sleeved on the outer wall of one end of the fastening inner tube. An extension tube is fixedly connected to one end of the connecting pipe, and a detection probe is provided on the inner wall of the extension tube.

[0005] A further improvement of this utility model is that the inner wall of the fastening sleeve near one end is threadedly connected to the outer wall of the extension tube, and a rotating handle ring is fixedly connected to the outer wall of the fastening sleeve near one end.

[0006] A further improvement of this utility model is that: a gathering groove is provided on the outer wall of the inner tube near one end, and the inner wall of the sleeve near one end is movably connected to the outer wall of the inner tube.

[0007] A further improvement of this utility model is that: a detection tube is fixedly connected to one end of the detection probe, and a mounting bracket is fixedly connected to the end of the detection tube away from the detection probe.

[0008] A further improvement of this utility model is that a ventilation hole is provided on one side of the mounting bracket.

[0009] A further improvement of this utility model is that a fixing collar is fixedly connected to the outer wall of the end of the extension tube away from the connecting tube.

[0010] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows: This utility model provides a pipe connection structure for motor vehicle exhaust gas testing. Through a triple-coupling structure of "insertion of the connecting pipe, tightening of the inner pipe and compression of the conical tightening sleeve", the tightening inner pipe can be tightly fitted to the outer wall of exhaust pipes of different diameters with the assistance of the converging groove, effectively blocking the exhaust gas leakage path, solving the problem of poor sealing in traditional structures, and ensuring the accuracy of test data.

[0011] This utility model provides a pipe connection structure for motor vehicle exhaust emission testing. The retractable design of the inner tube can be adapted to various specifications of exhaust pipes without the need to replace special connectors. The combination of the rotating handle and the threaded transmission structure enables quick connection and disassembly without the need for auxiliary tools, greatly improving testing efficiency, and is especially suitable for batch testing scenarios.

[0012] This utility model provides a pipe connection structure for motor vehicle exhaust gas testing. The extension pipe provides a dedicated installation channel for the test probe, avoiding direct exposure of the probe to the complex airflow of the exhaust pipe. The combination design of the mounting bracket and the vent hole not only fixes the test pipe but also balances the air pressure inside the pipe, reducing the impact of airflow disturbance on the test probe and improving the stability of the test data. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram showing the detailed structure of the connecting component of this utility model; Figure 3 This is a schematic diagram of the left-side structure of the fastening inner tube of this utility model; Figure 4 This is a schematic diagram of the detection probe structure of this utility model.

[0014] In the diagram: 1. Exhaust pipe; 2. Connecting assembly; 3. Vent pipe; 4. Fastening sleeve; 5. Fastening inner tube; 6. Connecting tube; 7. Detection probe; 8. Rotating handle ring; 9. Extension tube; 10. Detection tube; 11. Mounting bracket; 12. Vent hole; 13. Gathering groove; 14. Fixing collar. Detailed Implementation

[0015] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] The present invention will be further described in detail below with reference to embodiments: Example 1 like Figure 1-4 As shown, this utility model provides a pipe connection structure for motor vehicle exhaust gas testing, including an exhaust pipe 1, a connecting component 2 at one end of the exhaust pipe 1, and a vent pipe 3 fixedly connected to the end of the connecting component 2 away from the exhaust pipe 1. The connecting assembly 2 includes a connecting pipe 6, one end of which is movably inserted into the inner wall of one end of the exhaust pipe 1. A fastening inner tube 5 is fixedly sleeved on the outer wall of the end of the connecting pipe 6 away from the exhaust pipe 1. A fastening sleeve 4 is fixedly sleeved on the outer wall of one end of the fastening inner tube 5. An extension tube 9 is fixedly connected to one end of the connecting pipe 6. A detection probe 7 is provided on the inner wall of the extension tube 9.

[0017] The inner wall of the fastening sleeve 4 near one end is threaded to the outer wall of the extension tube 9, and a rotating handle ring 8 is fixedly connected to the outer wall of the fastening sleeve 4 near one end.

[0018] A gathering groove 13 is provided on the outer wall of the inner tube 5 near one end, and the inner wall of the sleeve 4 near one end is movably connected to the outer wall of the inner tube 5.

[0019] In this embodiment, through the triple-fit structure of "insertion of the connecting pipe 6, outer clamping of the inner tube 5 and compression of the conical clamping sleeve 4", the inner tube 5 can be tightly fitted to the outer wall of the exhaust pipe 1 of different diameters with the assistance of the gathering groove 13, effectively blocking the exhaust gas leakage path, solving the problem of poor sealing in traditional structures, and ensuring the accuracy of the test data.

[0020] Example 2 like Figure 1-4 As shown, based on Embodiment 1, this utility model provides a technical solution: preferably, one end of the detection probe 7 is fixedly connected to a detection tube 10, and the end of the detection tube 10 away from the detection probe 7 is fixedly connected to a mounting bracket 11.

[0021] A vent 12 is provided on one side of the mounting bracket 11.

[0022] A fixing collar 14 is fixedly connected to the outer wall of the end of the extension pipe 9 away from the connecting pipe 6.

[0023] In this embodiment, the extension tube 9 provides a dedicated installation channel for the detection probe 7, avoiding direct exposure of the probe to the complex airflow of the exhaust pipe 1; the combined design of the mounting bracket 11 and the vent 12 not only fixes the detection tube 10, but also balances the air pressure inside the tube, reducing the impact of airflow disturbance on the detection probe 7 and improving the stability of the detection data.

[0024] The working principle of the pipeline connection structure for motor vehicle exhaust emission testing will be explained in detail below.

[0025] like Figure 1-4 As shown, when testing the exhaust emissions of a motor vehicle, the connecting assembly 2 needs to be connected to the exhaust pipe 1: the connecting pipe 6 is inserted into the port of the exhaust pipe 1, at which time the inner fastening pipe 5 will be sleeved on the outer wall of the exhaust pipe 1, and the connecting pipe 6 and the inner wall of the exhaust pipe 1 will form a preliminary fit; rotate the rotating handle ring 8, which will drive the fastening sleeve 4 to move outward along the threaded structure of the outer wall of the extension pipe 9. Since the end of the fastening sleeve 4 near the inner fastening pipe 5 is a tapered structure, it will generate radial compression on the inner fastening pipe 5 with the converging groove 13 during its outward movement, causing the inner fastening pipe 5 to shrink and fit tightly against the outer wall of the exhaust pipe 1, thus completing the fixation of the connecting pipe 6 and the exhaust pipe 1. The exhaust gas from exhaust pipe 1 flows sequentially through connecting pipe 6 and extension pipe 9. The detection probe 7 on the inner wall of extension pipe 9 detects the exhaust gas composition, and the detection signal is transmitted to external equipment via detection pipe 10. Mounting bracket 11 provides fixed support for detection pipe 10, and its vent 12 balances airflow pressure, preventing localized airflow turbulence from affecting detection accuracy. The fixing collar 14 at the end of extension pipe 9 enhances the stability of the connection between the overall structure and external equipment. After detection, rotating the handle 8 in the reverse direction moves the fastening sleeve 4 back, releasing the pressure of the conical structure on the fastening inner tube 5. Under the elastic reset action of the gathering groove 13, the fastening inner tube 5 separates from the outer wall of exhaust pipe 1, allowing the connecting assembly 2 to be disassembled from exhaust pipe 1.

[0026] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A pipe connection structure for motor vehicle exhaust emission testing, comprising an exhaust pipe (1), characterized in that: A connecting component (2) is provided at one end of the exhaust pipe (1), and a vent pipe (3) is fixedly connected to the end of the connecting component (2) away from the exhaust pipe (1). The connecting assembly (2) includes a connecting pipe (6), one end of which is movably inserted into the inner wall of one end of the exhaust pipe (1), and a fastening inner tube (5) is fixedly sleeved on the outer wall of the end of the connecting pipe (6) away from the exhaust pipe (1). A fastening sleeve (4) is fixedly sleeved on the outer wall of one end of the fastening inner tube (5). An extension tube (9) is fixedly connected to one end of the connecting pipe (6), and a detection probe (7) is provided on the inner wall of the extension tube (9).

2. The pipeline connection structure for motor vehicle exhaust emission testing according to claim 1, characterized in that: The inner wall of the fastening sleeve (4) near one end is threaded to the outer wall of the extension tube (9), and a rotating handle ring (8) is fixedly connected to the outer wall of the fastening sleeve (4) near one end.

3. The pipeline connection structure for motor vehicle exhaust emission testing according to claim 1, characterized in that: The outer wall of the inner tube (5) near one end is provided with a gathering groove (13), and the inner wall of the sleeve (4) near one end is movably connected to the outer wall of the inner tube (5).

4. The pipe connection structure for motor vehicle exhaust emission testing according to claim 1, characterized in that: One end of the detection probe (7) is fixedly connected to a detection tube (10), and the end of the detection tube (10) away from the detection probe (7) is fixedly connected to a mounting bracket (11).

5. The pipeline connection structure for motor vehicle exhaust emission testing according to claim 4, characterized in that: A vent (12) is provided on one side of the mounting bracket (11).

6. The pipeline connection structure for motor vehicle exhaust emission testing according to claim 1, characterized in that: A fixing collar (14) is fixedly connected to the outer wall of the end of the extension tube (9) away from the connecting tube (6).

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