Exhaust manifold sealing connection structure

Abstract

The application discloses an exhaust manifold sealing connection structure for connecting a first main pipe of a first exhaust manifold with a second main pipe of a second exhaust manifold, comprising a wrapping end arranged at an end of the first main pipe and a fitting end arranged at an end of the second main pipe, the wrapping end being sleeved outside the fitting end. The fitting end is sequentially provided with a first ring part, a second ring part and a third ring part in a direction away from the first exhaust manifold at the end of the second main pipe, and the diameters of the three ring parts gradually increase. The wrapping end comprises a mounting pipe section and a curved pipe section, the diameter of the mounting pipe section is larger than the diameter of the first main pipe, and the curved pipe section is used for connecting the first main pipe with the mounting pipe section through a curved surface. The inner wall of the mounting pipe section is used for limiting the outer wall of the third ring part, and a sealing ring is arranged in a mounting gap between the second ring part and the mounting pipe section; and the first ring part is mounted in cooperation with the inner wall of the curved pipe section. The application realizes composite sealing through cooperation of multiple structures, and improves the sealing effect.

Description

Technical Field

[0001] This application relates to the field of exhaust pipe sealing technology, specifically to an exhaust manifold sealing connection structure. Background Technology

[0002] The exhaust manifold is a pipe connected to the engine cylinder block, which collects and discharges exhaust gases from each cylinder. Its main function is to minimize exhaust resistance, improve exhaust gas flow, and prevent interference between cylinders. During engine operation, exhaust gases from different cylinders can interfere with each other. When one cylinder is expelling exhaust gas, it may encounter incomplete exhaust gas from another cylinder being drawn into the combustion chamber, increasing exhaust resistance and reducing engine output power. The solution is to separate the exhaust gases of each cylinder as much as possible, with one branch per cylinder or one branch for two cylinders, and to make each branch as long and independently shaped as possible to reduce mutual interference between gases in different pipes. However, leakage at the connection points of the exhaust manifolds has always existed and has not been completely resolved, especially in natural gas engines where the maximum exhaust temperature is nearly 800°C, making sealing between exhaust manifolds extremely difficult. Current technology using sealing rings alone is costly and cannot achieve ideal sealing results; while using gaskets or other sealing materials increases the rate of damage to the sealing structure. Conventional exhaust manifolds are difficult to disassemble after assembly, significantly increasing subsequent maintenance costs.

[0003] Therefore, how to provide a sealing connection structure with strong and perfect sealing effect is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this application is to provide an exhaust manifold sealing connection structure that has a strong sealing effect, is easy to disassemble and maintain, and has a well-designed and reasonable structure.

[0005] To achieve the above objectives, this application provides an exhaust manifold sealing connection structure for connecting the first main body pipe of a first exhaust manifold to the second main body pipe of a second exhaust manifold, comprising: a wrapping end disposed at the end of the first main body pipe and an assembly end disposed at the end of the second main body pipe, wherein the wrapping end is fitted onto the outside of the assembly end.

[0006] The assembly end has a first ring, a second ring, and a third ring arranged sequentially around the end of the second main pipe in a direction away from the first exhaust manifold, with the diameters of the three rings increasing sequentially; the wrapping end includes an installation pipe section and a curved pipe section, with the diameter of the installation pipe section being larger than the diameter of the first main pipe; the curved pipe section connects the first main pipe and the installation pipe section through a curved surface;

[0007] The inner wall of the installation pipe section is used to limit the outer wall of the third ring, and a sealing ring is provided in the installation gap between the second ring and the installation pipe section; the first ring is installed in conjunction with the inner wall of the curved pipe section.

[0008] In some embodiments, the inner wall of the mounting pipe section is clearance-fitted with the outer wall of the third ring portion.

[0009] In some embodiments, a flow guide end is provided on the outer wall of the first ring portion, and the outer wall of the flow guide end is clearance-fitted with the inner wall of the curved pipe section.

[0010] In some embodiments, the outer wall of the guide end is provided with an inclined section, the surface of which is parallel to the inner wall of the curved pipe section.

[0011] In some embodiments, the axial length of the third ring is less than the axial length of the second ring.

[0012] In some embodiments, a sealing ring groove is provided on the second ring portion for installing a sealing ring.

[0013] This application also provides an engine exhaust system, including the exhaust manifold sealing connection structure of any of the above.

[0014] Compared to the aforementioned background technology, the exhaust manifold sealing connection structure of this application is used to connect the first main body pipe of a first exhaust manifold to the second main body pipe of a second exhaust manifold. It includes: a wrapping end disposed at the end of the first main body pipe and an assembly end disposed at the end of the second main body pipe, with the wrapping end fitted over the outside of the assembly end. The assembly end has a first ring, a second ring, and a third ring sequentially arranged around the end of the second main body pipe in a direction away from the first exhaust manifold, with the diameters of the three rings increasing progressively. The wrapping end includes an installation pipe section and a curved pipe section. The diameter of the installation pipe section is larger than the diameter of the first main body pipe, and the curved pipe section is used to connect the first main body pipe and the installation pipe section via a curved surface. The inner wall of the installation pipe section is used to limit the outer wall of the third ring, and a sealing ring is disposed within the installation gap between the second ring and the installation pipe section; the first ring is fitted into the inner wall of the curved pipe section. This application achieves a composite seal through multiple structural fits, improving the sealing effect.

[0015] The engine exhaust system with the above-mentioned exhaust manifold sealing connection structure provided in this application has the aforementioned beneficial effects, which will not be elaborated further in this article. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the exhaust manifold sealing connection structure provided in the embodiments of this application;

[0018] Figure 2 This is a partially enlarged view of the exhaust manifold sealing connection structure provided in the embodiments of this application.

[0019] in:

[0020] 1-First exhaust manifold, 2-Second exhaust manifold, 3-First ring, 31-Guide end, 4-Second ring, 41-Sealing ring groove, 5-Third ring, 6-Installation pipe section, 7-Bent pipe section, 8-Sealing ring. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Reference manual attached Figure 1 and attached Figure 2 , attached Figure 1 This is a schematic diagram of the exhaust manifold sealing connection structure provided in the embodiments of this application. Figure 2 This is a partial enlarged view of the exhaust manifold sealing connection structure provided in the embodiment of this application. It can be seen that an exhaust manifold sealing connection structure is used to connect the first main body pipe of the first exhaust manifold 1 to the second main body pipe of the second exhaust manifold 2. It includes: a wrapping end disposed at the end of the first main body pipe and an assembly end disposed at the end of the second main body pipe. The wrapping end is fitted onto the outside of the assembly end.

[0024] The assembly end is provided with a first ring 3, a second ring 4 and a third ring 5 arranged sequentially around the end of the second main tube in a direction away from the first exhaust manifold 1, and the diameter of the three rings increases progressively, forming the entire assembly end with three consecutive rings.

[0025] The aforementioned package end includes an installation pipe section 6 and a curved pipe section 7. The diameter of the installation pipe section 6 is larger than the diameter of the first main pipe. The curved pipe section 7 is used to connect the first main pipe and the installation pipe section 6 through a curved surface.

[0026] The inner wall of the aforementioned installation pipe section 6 is used to limit the outer wall of the aforementioned third ring 5, and a sealing ring 8 is provided in the installation gap between the aforementioned second ring 4 and the aforementioned installation pipe section 6; the aforementioned first ring 3 is fitted with the inner wall of the aforementioned curved pipe section 7 for installation.

[0027] The arrows in the diagram indicate the direction of airflow. The mating areas of the sealing ring 8 and the third ring 5 cooperate to achieve a sealing effect. This application achieves a seal in the radial direction through the sealing ring 8, and a composite seal through the mating of the first ring 3 with the inner wall of the aforementioned curved pipe section 7.

[0028] Furthermore, the inner wall of the aforementioned installation pipe section 6 is fitted with the outer wall of the aforementioned third ring section 5 with a clearance. The clearance between the two can be sealed by utilizing the thermal expansion generated when the exhaust manifold transmits hot gas, thereby achieving a multi-seal effect by utilizing the thermal expansion property of the exhaust gas.

[0029] Furthermore, a guide end 31 is provided on the outer wall of the first ring 3. The outer wall of the guide end 31 is in clearance fit with the inner wall of the curved pipe section 7. This clearance fit prevents airflow from directly entering the installation gap between the second ring 4 and the installation pipe section 6 and eroding the sealing ring 8. The fit between the outer wall of the guide end 31 and the curved pipe section 7 can be changed according to actual needs. It is sufficient to form a curved barrier layer that obstructs hot air within the gap between the airflow channel and the sealing ring 4. Generally, the bending extension direction of the curved pipe section 7 is opposite to the airflow direction, thus forming a flow channel that obstructs the inflow of airflow. The overall connection structure forms a multi-level sealing connection structure through two thermal expansion clearance fits and one radial sealing fit of the sealing ring 4.

[0030] Furthermore, the outer wall of the aforementioned guide end 31 is provided with an inclined section, the surface of which is parallel to the inner wall of the aforementioned curved pipe section 7. This ensures that when the pipeline expands due to heat, the clearance fit between the two can form a corresponding seal, and will not cause the structural assembly to become loose or jammed.

[0031] In one embodiment of this application, the inclined section is set as a chamfer at 45° relative to the second main tube. The inclined chamfer just maintains the relative position with the inner wall of the curved section 7, which facilitates the assembly of the first exhaust manifold 1 and the second exhaust manifold 2, facilitates the formation of a clearance fit area between the curved section 7 and the guide end 31, and does not form radial obstruction, which facilitates the disassembly of the manifold.

[0032] Furthermore, the axial length of the third ring 5 is less than the axial length of the second ring 4. This results in a relatively short sealing area between the third ring 5 and the mounting pipe section 6, making the manifold connection easy to disassemble and replace even after long-term use, deformation, or heat deformation. This optimizes the structural design and reduces subsequent maintenance costs.

[0033] Furthermore, a sealing ring groove 41 is provided on the second ring portion 4. The sealing ring groove 41 is used to install the sealing ring 8. The cooperation of the multi-layer sealing structure reduces the need for the sealing ring 8 to achieve radial sealing, thereby reducing the structural production cost.

[0034] During actual assembly, the sealing ring 4 is first inserted into the sealing ring groove 41. Then, using a tool, the assembly end is inserted into the wrapping end and moved until the first ring 3 and the bent pipe section 7 are properly engaged and the installation pipe 6 and the third ring 5 are properly engaged. At this point, the first main pipe and the second main pipe are connected, and the high-heat exhaust gas flow is transported from the second exhaust manifold 2 to the first exhaust manifold 1. During the transport process, the second exhaust manifold 2 expands due to heat, enhancing the sealing effect at the first ring 3 and the third ring 5, and working in conjunction with the radial sealing of the sealing ring 4. When it is necessary to disassemble the branch pipe, it can be disassembled simply by separating the connection section between the installation pipe 6 and the third ring 5, reducing the difficulty of disassembly.

[0035] This application also provides an engine exhaust system, including the exhaust manifold sealing connection structure described in the above specific embodiments; the setting and usage of the engine exhaust system can be referred to the prior art, and will not be repeated here.

[0036] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0037] The exhaust manifold sealing connection structure provided in this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that for those skilled in the art, without departing from the principles of this application, [the following is a more detailed explanation].

[0038] It should be noted that several improvements and modifications can be made to this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An exhaust manifold sealing connection structure for communicating a first main pipe of a first exhaust manifold (1) with a second main pipe of a second exhaust manifold (2), characterized by, The application relates to an exhaust manifold sealing connection structure. The wrapping end is sleeved outside the assembling end. The first ring part (3), the second ring part (4) and the third ring part (5) are sequentially arranged on the assembling end in a direction away from the first exhaust manifold (1), and the diameters of the three ring parts are sequentially increased; the wrapping end comprises a mounting pipe section (6) and a curved pipe section (7), the diameter of the mounting pipe section (6) is larger than the diameter of the first main pipe; the curved pipe section (7) connects the first main pipe and the mounting pipe section (6) through a curved surface; The inner wall of the mounting pipe section (6) is used for limiting the outer wall of the third ring part (5), a sealing ring (8) is arranged in an installation gap between the second ring part (4) and the mounting pipe section (6) to realize radial sealing; the first ring part (3) is mounted in cooperation with the inner wall of the curved pipe section (7), the curved extension direction of the curved pipe section (7) is opposite to the flow direction of the airflow, so that the airflow cannot directly enter the installation gap between the second ring part (4) and the mounting pipe section (6) to flush the sealing ring (8); The inner wall of the mounting pipe section (6) is in gap cooperation with the outer wall of the third ring part (5); a flow guide end (31) is arranged on the outer wall of the first ring part (3), the outer wall of the flow guide end (31) is in gap cooperation with the inner wall of the curved pipe section (7), and the cooperation gaps of the two gap cooperations realize sealing through thermal expansion.

2. The exhaust manifold sealed connection structure according to claim 1, characterized by The outer wall of the flow guide end (31) is provided with an inclined section, and the surface of the inclined section is parallel to the inner wall of the curved pipe section (7).

3. The exhaust manifold sealed connection structure according to claim 1, characterized by, The axial length of the third ring part (5) is smaller than the axial length of the second ring part (4).

4. The exhaust manifold sealed connection structure according to claim 1, characterized by A sealing ring groove (41) is arranged on the second ring part (4) and used for mounting the sealing ring (8).

5. An engine exhaust system characterized by, The exhaust manifold sealing connection structure comprises the exhaust manifold sealing connection structure according to any one of claims 1-4.

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