Multi-stage sealing structure of exhaust gas recirculation intake pipe

Abstract

The utility model discloses a multistage sealing structure of waste gas recirculation air inlet pipe relates to pipeline sealing structure technical field, the utility model discloses an air inlet pipe body, air inlet pipe body one side is provided with the connecting pipe, air inlet pipe body one side is provided with the sealing assembly, the sealing assembly includes the sealing groove of setting up in the connecting pipe surface, sets up the first sealing ring of sealing groove inside, the utility model discloses the sealing groove and first sealing ring of setting up in the connecting pipe surface, and the second sealing ring in the air inlet pipe body inside, forms double -layer sealing barrier, and first sealing ring adopts high -temperature resistant silica gel material, can still keep elasticity under long -term high -temperature working condition, and second sealing ring as spare sealing layer, even if first sealing ring failure still can maintain basic sealing function, and the sealing cover of setting in the connecting pipe surface further enhanced the sealing effect, and the bellows structure can compensate installation error and absorb vibration energy, significantly reduce the sealing failure risk caused by vibration.

Description

Technical Field

[0001] This utility model belongs to the technical field of pipeline sealing structure, and in particular relates to a multi-stage sealing structure for an exhaust gas recirculation inlet pipe. Background Technology

[0002] The exhaust gas recirculation (EGR) intake manifold is a key component of the engine's EGR system, its main function being to introduce a portion of the exhaust gases from the engine into the intake system. It is typically made of high-temperature resistant, corrosion-resistant metals or composite materials, and connects the exhaust manifold to the intake manifold or throttle valve, allowing the exhaust gases to mix with fresh air before entering the cylinders for combustion. By lowering the combustion temperature, this intake manifold effectively reduces the formation of nitrogen oxides (NOx), improving the engine's environmental performance. It also helps cope with high-temperature, high-pressure, and vibration conditions.

[0003] Currently, most exhaust gas recirculation (EGR) intake pipes are fixed using a snap-fit ​​method during installation. While this method is simple to operate, it has certain drawbacks. The intake pipe usually has a sealing gasket inside, which is used to ensure the sealing of the connection. During the long-term operation of the engine, the sealing gasket will be continuously affected by high temperature, high pressure and corrosive substances in the exhaust gas. Over time, it is prone to aging and deformation. Once the snap-fit ​​part becomes loose, the sealing effect of the sealing gasket will be greatly reduced, leading to exhaust gas leakage. Moreover, some structural designs are complex and difficult to disassemble and maintain.

[0004] To address these issues, we provide a multi-stage sealing structure for the exhaust gas recirculation intake pipe. Utility Model Content

[0005] The purpose of this utility model is to provide a multi-stage sealing structure for an exhaust gas recirculation intake pipe. By cooperating with the sealing component and the fixing component, it solves the problem that most exhaust gas recirculation intake pipes are fixed by snap-fit ​​during installation. The internal sealing gasket is prone to aging and deformation after long-term use, and the sealing performance will be greatly reduced when the snap-fit ​​becomes loose.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0007] This utility model relates to a multi-stage sealing structure for an exhaust gas recirculation intake pipe, comprising an intake pipe body with a connecting pipe on one side; a sealing assembly on one side of the intake pipe body, the sealing assembly including a sealing groove formed on the surface of the connecting pipe, a first sealing ring disposed inside the sealing groove, a second sealing ring disposed inside the intake pipe body, and a sealing cover fitted onto the surface of the connecting pipe; and a fixing assembly on one side of the intake pipe body, the fixing assembly including a fixing plate installed on one side of the connecting pipe, a fixing groove formed on the surface of the fixing plate, a slot formed on the surface of the intake pipe body, a limiting groove formed inside the slot, and a hose clamp fitted onto the surface of the limiting groove.

[0008] The present invention is further configured such that a fixing ring is fixedly connected to the surface of the connecting pipe, and one side of the fixing ring is fixedly connected to the sealing cover.

[0009] The present invention is further configured such that one side of the sealing cover is embedded in the fixing groove and the limiting groove, and the sealing cover is tightened and fixed by the hose clamp.

[0010] The present invention is further configured such that one end of the fixing plate is inserted into the slot, and the fixing slot and the slot are aligned.

[0011] The present invention is further configured such that one side of the first sealing ring contacts the air intake pipe body, and one side of the second sealing ring contacts the connecting pipe.

[0012] The present invention is further configured such that the hose clamp drives the worm gear to rotate through the rotating bolt, and the worm gear drives the clamp belt to contract to generate radial clamping force, which fixes the sealing cover and connects the air intake pipe and the connecting pipe at the same time.

[0013] The present invention has the following beneficial effects.

[0014] 1. This utility model forms a double sealing barrier through a sealing groove and a first sealing ring on the surface of the connecting pipe, and a second sealing ring inside the intake pipe. The first sealing ring is made of high-temperature resistant silicone material, which can maintain elasticity under long-term high-temperature conditions. The second sealing ring serves as a backup sealing layer, which can maintain basic sealing function even if the first sealing ring fails. The sealing cover fitted on the surface of the connecting pipe further enhances the sealing effect. Its bellows structure can compensate for installation errors and absorb vibration energy, significantly reducing the risk of sealing failure caused by vibration. This multi-stage sealing design enables the system to maintain excellent sealing performance under high temperature, high pressure and vibration environments, and greatly extends the maintenance cycle.

[0015] 2. The fixing component of this utility model adopts a modular design. Through the synergistic effect of the fixing plate, the slot, and the hose clamp, the intake pipe body and the connecting pipe can be quickly disassembled and stably connected. The design of inserting one end of the fixing plate into the slot simplifies the installation process. With the help of the limiting groove and the worm gear drive mechanism of the hose clamp, a uniform radial clamping force can be generated to ensure that the connection part remains stable under the severe vibration of the engine. The self-locking characteristic of the hose clamp prevents loosening, while the precise alignment design of the fixing groove and the slot avoids installation deviation. This structure not only improves the installation efficiency, but also solves the problem of easy loosening in the traditional snap-fit ​​method.

[0016] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a three-dimensional diagram of a multi-stage sealing structure for an exhaust gas recirculation intake pipe.

[0019] Figure 2 This is an exploded schematic diagram of a multi-stage sealing structure for an exhaust gas recirculation intake pipe.

[0020] Figure 3 This is a cross-sectional view of the intake pipe body and connecting pipe in a multi-stage sealing structure of an exhaust gas recirculation intake pipe.

[0021] Figure 4 This is a schematic diagram showing the separation of the intake pipe body and the connecting pipe in a multi-stage sealing structure of an exhaust gas recirculation intake pipe.

[0022] In the attached diagram: 1. Intake pipe body; 2. Connecting pipe; 3. Sealing assembly; 301. Sealing groove; 302. First sealing ring; 303. Second sealing ring; 304. Sealing cover; 4. Fixing assembly; 401. Fixing plate; 402. Fixing groove; 403. Slot; 404. Limiting groove; 405. Hose clamp; 5. Fixing ring. Detailed Implementation

[0023] The technical solutions of the present invention will be described below with reference to the accompanying drawings of the embodiments of the present invention. The described embodiments are only some embodiments of the present invention, and not all embodiments. Example

[0024] Please see Figures 1-4This utility model relates to a multi-stage sealing structure for an exhaust gas recirculation intake pipe, comprising an intake pipe body 1, a connecting pipe 2 disposed on one side of the intake pipe body 1, a sealing assembly 3 disposed on one side of the intake pipe body 1, the sealing assembly 3 comprising a sealing groove 301 formed on the surface of the connecting pipe 2, a first sealing ring 302 disposed inside the sealing groove 301, a second sealing ring 303 disposed inside the intake pipe body 1, and a sealing cover 304 fitted onto the surface of the connecting pipe 2; and a fixing assembly 4 disposed on one side of the intake pipe body 1, the fixing assembly 4 comprising a fixing plate 401 installed on one side of the connecting pipe 2, a fixing groove 402 formed on the surface of the fixing plate 401, a slot 403 formed on the surface of the intake pipe body 1, a limiting groove 404 formed inside the slot 403, and a hose clamp 405 fitted onto the surface of the limiting groove 404. The intake pipe body 1 and the connecting pipe 2 are made of corrosion-resistant materials. Made of metal, it can effectively extend service life and ensure the stability of exhaust gas transmission. The sealing groove 301 on the surface of the connecting pipe 2 provides a precise positioning space for the first sealing ring 302, ensuring that the first sealing ring 302 will not shift in a high-temperature environment. The first sealing ring 302 is made of high-temperature resistant silicone material, which can maintain elasticity during long-term use and effectively prevent exhaust gas leakage. The second sealing ring 303 set inside the intake pipe body 1 forms a double sealing barrier with the first sealing ring 302. Even if a single sealing ring fails, it can still maintain basic sealing function. The sealing cover 304 fitted on the surface of the connecting pipe 2 adopts a corrugated pipe structure, which can compensate for installation errors and absorb vibration energy, further reducing the risk of leakage. The precise alignment design of the fixing groove 402 and the slot 403 enables rapid positioning and installation, greatly shortening maintenance time. Example

[0025] Please see Figures 1-4Based on Embodiment 1, a fixing ring 5 is fixedly connected to the surface of the connecting pipe 2. One side of the fixing ring 5 is fixedly connected to the sealing cover 304. One side of the sealing cover 304 is embedded in the fixing groove 402 and the limiting groove 404. The hose clamp 405 is used to tighten and fix one side of the sealing cover 304. One end of the fixing plate 401 is inserted into the slot 403, and the fixing groove 402 and the slot 403 are aligned. One side of the first sealing ring 302 is in contact with the intake pipe body 1, and one side of the second sealing ring 303 is in contact with the connecting pipe 2. The hose clamp 405 drives the worm gear to rotate through the rotating bolt. The worm gear drives the clamp band to contract and generate radial clamping force. While fixing the sealing cover 304, the intake pipe body 1 and the connecting pipe 2 are connected. The arc-shaped contour design of the limiting groove 404 allows the hose clamp 405 to apply force evenly, avoiding sealing failure caused by local stress concentration. The hose clamp 405 adopts a worm gear transmission mechanism, which can generate a stable radial clamping force by rotating the bolt. This is a mature technology application that ensures both convenient installation and reliable long-term fixation. One side of the sealing cover 304 is embedded in the fixing groove 402 and the limiting groove 404, forming a three-dimensional sealing system. The clamping force of the hose clamp 405 causes the sealing cover 304 to produce uniform radial deformation, which ensures airtightness without excessive compression that could lead to material fatigue. This design is particularly suitable for working conditions with thermal expansion and contraction and can automatically compensate for dimensional changes.

[0026] The working principle of this utility model is as follows: When it is necessary to connect the intake pipe body 1 and the connecting pipe 2, the operator first places the first sealing ring 302 into the intake pipe body 1, such as... Figure 3 As shown, the second sealing ring 303 is then moved into the sealing groove 301, and then the connecting pipe 2 is moved. The connecting pipe 2 drives the fixing plate 401 to rotate, so that the fixing plate 401 is aligned with the slot 403. At the same time, the connecting pipe 2 is pushed closer to the intake pipe body 1. After the fixing plate 401 moves along the slot 403, the limiting groove 404 can be aligned with the fixing groove 402. While the connecting pipe 2 is moving, it contacts the first sealing ring 302, and the intake pipe body 1 contacts the second sealing ring 303. The connection between the intake pipe body 1 and the connecting pipe 2 is sealed by the first sealing ring 302 and the second sealing ring 303, thereby improving the sealing effect.

[0027] Then, flip the sealing cover 304 so that it fits onto the connection position between the intake pipe body 1 and the connecting pipe 2, and then place it in the limiting groove 404 and the fixing groove 402. Then, use the hose clamp 405 to tighten and fix the sealing cover 304 in the limiting groove 404 and the fixing groove 402. While fixing the sealing cover 304, the intake pipe body 1 and the connecting pipe 2 can also be installed. The sealing cover 304 can provide a tight seal at the connection between the intake pipe body 1 and the connecting pipe 2, further improving the sealing effect.

[0028] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-stage sealing structure for an exhaust gas recirculation inlet pipe, comprising an inlet pipe body (1), characterized in that: A connecting pipe (2) is provided on one side of the air intake pipe (1); A sealing assembly (3) is provided on one side of the air intake pipe (1). The sealing assembly (3) includes a sealing groove (301) opened on the surface of the connecting pipe (2), a first sealing ring (302) disposed inside the sealing groove (301), a second sealing ring (303) disposed inside the air intake pipe (1), and a sealing cover (304) fitted on the surface of the connecting pipe (2). A fixing component (4) is provided on one side of the intake pipe body (1). The fixing component (4) includes a fixing plate (401) installed on one side of the connecting pipe (2), a fixing groove (402) opened on the surface of the fixing plate (401), a slot (403) opened on the surface of the intake pipe body (1), a limiting groove (404) opened inside the slot (403), and a hose clamp (405) sleeved on the surface of the limiting groove (404).

2. The multi-stage sealing structure of the exhaust gas recirculation inlet pipe according to claim 1, characterized in that: A fixing ring (5) is fixedly connected to the surface of the connecting pipe (2), and one side of the fixing ring (5) is fixedly connected to the sealing cover (304).

3. The multi-stage sealing structure of the exhaust gas recirculation inlet pipe according to claim 1, characterized in that: The sealing cover (304) is embedded in the fixing groove (402) and the limiting groove (404) on one side, and the sealing cover (304) is tightened and fixed on one side by the hose clamp (405).

4. The multi-stage sealing structure of the exhaust gas recirculation inlet pipe according to claim 1, characterized in that: One end of the fixing plate (401) is inserted into the slot (403), and the fixing slot (402) and the slot (403) are aligned.

5. The multi-stage sealing structure of the exhaust gas recirculation inlet pipe according to claim 1, characterized in that: The first sealing ring (302) is in contact with the intake pipe body (1) on one side, and the second sealing ring (303) is in contact with the connecting pipe (2) on one side.

6. The multi-stage sealing structure of the exhaust gas recirculation inlet pipe according to claim 1, characterized in that: The hose clamp (405) drives the worm gear to rotate through the rotating bolt. The worm gear drives the clamp belt to contract and generate radial clamping force. While fixing the sealing cover (304), it connects the air intake pipe body (1) and the connecting pipe (2).

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