Exhaust manifold assembly

Abstract

The invention relates to the technical field of engines, in particular to an exhaust manifold assembly which comprises an air inlet flange, an exhaust manifold, a three-way catalyst and an air outlet flange, a collecting plate is detachably arranged at the joint of the air inlet flange and the exhaust manifold, and therefore in the welding process of the air inlet flange and the exhaust manifold, the three-way catalyst and the air outlet flange are not prone to deformation. The collecting plate can collect redundant welding fluid generated by welding, meanwhile, after welding is completed, the collecting plate can be taken down, so that the collecting plate cannot affect the subsequent using process, and collecting grooves are annularly and evenly formed in the periphery of the side, close to the three-way catalyst, of the air outlet flange, so that the collecting effect is improved. Therefore, in the welding process of the three-way catalyst and the air outlet flange, redundant welding fluid can flow into the collecting groove and does not extend along the flange face of the air outlet flange, and the technical problem that after an existing exhaust manifold assembly is welded, a welding seam extends to the flange face, and consequently a bolt cannot make full contact with the flange is solved.

Description

Technical Field

[0001] The invention relates to the technical field of engines, and in particular to an exhaust manifold assembly. Background Art

[0002] At present, due to the increasingly stringent emission regulations, automobile exhaust emissions are receiving more and more attention. When automobile exhaust is discharged, the entire working process is: when the engine is working, the exhaust gas discharged by the engine is collected through the exhaust manifold, and then after purification by the three-way catalytic converter, it is discharged into the atmosphere after the exhaust noise is reduced through the muffler.

[0003] In order to avoid airflow interference caused by airflow entering the three-way catalytic converter, the existing exhaust manifold assembly leads out independent and symmetrical manifold air ducts at the corresponding cylinder head outlets and converges collectively at the connection of the three-way catalytic converter, thereby ensuring stable air pressure at the airflow confluence point, making the airflow in the three-way catalytic converter assembly uniform, and avoiding problems such as insensitive oxygen sensor signal reception and high exhaust back pressure.

[0004] However, since the intake flange and exhaust manifold, the exhaust manifold and three-way catalytic converter, as well as the three-way catalytic converter and the outlet flange are all connected by welding, a weld will be produced at the joint of the two components after welding. If the weld is wide, the weld will extend to the flange mounting surface of the intake flange or the outlet flange, making it impossible for the bolts to fully contact the intake flange or the outlet flange, which can easily lead to insufficient installation torque and air leakage from the flange mounting surface. Summary of the invention

[0005] The purpose of the present invention is to provide an exhaust manifold assembly, which solves the technical problem that the intake flange and the exhaust manifold, the exhaust manifold and the three-way catalytic converter, and the three-way catalytic converter and the outlet flange of the existing exhaust manifold assembly are all connected by welding. After welding, a weld will be generated at the junction of the two components. If the weld is wide, the weld will extend to the flange mounting surface of the intake flange or the outlet flange, so that the bolts cannot fully contact the intake flange or the outlet flange, which can easily lead to insufficient installation torque and leakage of the flange mounting surface.

[0006] To achieve the above-mentioned objectives, the present invention provides an exhaust manifold assembly, comprising an intake flange, an exhaust manifold, a three-way catalytic converter and an outlet flange, wherein the intake flange, the exhaust manifold, the three-way catalytic converter and the outlet flange are connected in sequence, and a collecting plate is detachably connected to a side of the intake flange close to the exhaust manifold, and the collecting plate is located below the exhaust manifold, and is used for collecting excess welding liquid generated during the welding process of the intake flange and the exhaust manifold, and collecting grooves are evenly distributed on a side of the outlet flange close to the three-way catalytic converter, and are used for collecting excess welding liquid generated during the welding process of the three-way catalytic converter and the outlet flange.

[0007] The air inlet flange and the exhaust manifold, the exhaust manifold and the three-way catalytic converter, and the three-way catalytic converter and the air outlet flange are all connected by welding.

[0008] The exhaust manifold includes a branch air duct and a main air duct, the branch air duct is communicated with the air inlet flange and the main air duct respectively, and the main air duct is communicated with the air outlet flange.

[0009] There are four branch airways, and the adjacent branch airways are in a "Y" shape and merge at the main airway.

[0010] Wherein, the collecting plate and the air inlet flange are connected by mutual snap-fitting.

[0011] Wherein, the air inlet flange and the air outlet flange are both provided with bolt mounting holes for connecting the air inlet flange or the air outlet flange with corresponding parts of the engine by means of bolts.

[0012] Wherein, the collecting tank is arranged between the air outlet hole of the air outlet flange and the bolt mounting hole.

[0013] The present invention provides an exhaust manifold assembly. The present invention disassembles and sets the collecting plate at the connection between the intake flange and the exhaust manifold, so that during the welding process of the intake flange and the exhaust manifold, the collecting plate can collect excess welding liquid generated by welding. At the same time, after the welding is completed, the collecting plate can be removed, so that the collecting plate will not affect the subsequent use process. The collecting grooves are evenly arranged in a ring shape around the side of the outlet flange close to the three-way catalytic converter, so that during the welding process of the three-way catalytic converter and the outlet flange, excess welding liquid will flow into the collecting groove instead of extending along the flange surface of the outlet flange, thereby solving the technical problem of the existing exhaust manifold assembly that after welding, the weld extends to the flange surface, resulting in the bolts not being able to fully contact the flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 It is a schematic diagram of the overall structure of the exhaust manifold assembly according to the first embodiment of the present invention.

[0016] Figure 2 It is a schematic diagram of the connection between the branch airway and the main airway in the first embodiment of the present invention.

[0017] Figure 3 It is a schematic diagram of the connection between the three-way catalytic converter and the outlet flange of the first embodiment of the present invention.

[0018] In the figure: 101 - air inlet flange, 102 - three-way catalytic converter, 103 - air outlet flange, 104 - collecting plate, 105 - collecting tank, 106 - branch air duct, 107 - main air duct, 108 - buckle, 109 - slot, 110 - bolt mounting hole. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0020] First embodiment:

[0021] See also Figures 1 to 3 ,in Figure 1 is a schematic diagram of the overall structure of the exhaust manifold assembly of the first embodiment of the present invention, Figure 2 1 is a schematic diagram of the connection between the branch airway 106 and the main airway 107 according to the first embodiment of the present invention. Figure 3 It is a schematic diagram of the connection between the three-way catalytic converter 102 and the outlet flange 103 of the first embodiment of the present invention. The present invention provides an exhaust manifold assembly, including an intake flange 101, an exhaust manifold, a three-way catalytic converter 102 and an outlet flange 103.

[0022] In this embodiment, the present invention disassembles and sets the collecting plate 104 at the connection between the intake flange 101 and the exhaust manifold, so that during the welding process of the intake flange 101 and the exhaust manifold, the collecting plate 104 can collect the excess welding liquid generated by welding. At the same time, after the welding is completed, the collecting plate 104 can be removed, so that the collecting plate 104 will not affect the subsequent use process. The collecting grooves 105 are evenly arranged in a ring shape around the side of the outlet flange 103 close to the three-way catalytic converter 102, so that during the welding process of the three-way catalytic converter 102 and the outlet flange 103, the excess welding liquid will flow into the collecting groove 105 instead of extending along the flange surface of the outlet flange 103, thereby solving the technical problem that after welding of the existing exhaust manifold assembly, the weld extends to the flange surface, resulting in the inability of the bolts to fully contact the flange.

[0023] Among them, the intake flange 101, the exhaust manifold, the three-way catalytic converter 102 and the outlet flange 103 are connected in sequence, and the intake flange 101 is detachably connected to a side close to the exhaust manifold with a collecting plate 104, and the collecting plate 104 is located below the exhaust manifold, and is used for collecting excess welding liquid generated during the welding process of the intake flange 101 and the exhaust manifold, and the outlet flange 103 is evenly distributed with collecting grooves 105 on a side close to the three-way catalytic converter 102, and is used for collecting excess welding liquid generated during the welding process of the three-way catalytic converter 102 and the outlet flange 103.

[0024] Secondly, the air inlet flange 101 and the exhaust manifold, the exhaust manifold and the three-way catalytic converter 102, and the three-way catalytic converter 102 and the air outlet flange 103 are all connected by welding.

[0025] Again, the exhaust manifold includes a branch air duct 106 and a main air duct 107. The branch air duct 106 is connected to the intake flange 101 and the main air duct 107 respectively. The main air duct 107 is connected to the outlet flange 103. There are four branch air ducts 106. Adjacent branch air ducts 106 are in a "Y" shape and merge at the main air duct 107. All the branch air ducts 106 are centered on the axis of the main air duct 107 and are in an axially symmetrical structure.

[0026] At the same time, the collecting plate 104 and the air intake flange 101 are connected by mutual snap-fitting. The collecting plate 104 has a snap 108, and the air intake flange 101 has a slot 109. By snapping the snap 108 into the slot 109, the collecting plate 104 and the air intake flange 101 are snap-fitted and connected to each other.

[0027] In addition, the air inlet flange 101 and the air outlet flange 103 are both provided with bolt mounting holes 110 for connecting the air inlet flange 101 or the air outlet flange 103 to corresponding parts of the engine by means of bolts.

[0028] Finally, the collecting tank 105 is disposed between the air outlet hole of the air outlet flange 103 and the bolt mounting hole 110 .

[0029] When using an exhaust manifold assembly of this embodiment, before welding the intake flange 101 and the exhaust manifold, first align the buckle 108 with the slot 109, and then snap the buckle 108 into the slot 109, so that the collecting plate 104 and the intake flange 101 are mutually snap-connected, thereby installing the collecting plate 104. After installation, weld the connection between the intake flange 101 and the exhaust manifold. During the welding process, the excess welding liquid generated will fall on the The collecting plate 104 is cooled and solidified on the collecting plate 104, thereby collecting the excess welding liquid during the welding process of the intake flange 101 and the exhaust manifold. When welding the connection between the three-way catalytic converter 102 and the outlet flange 103, the excess welding liquid generated during the welding process will flow into the collecting tank 105 instead of extending along the flange surface of the outlet flange 103, thereby collecting the excess welding liquid during the welding process of the three-way catalytic converter 102 and the outlet flange 103.

[0030] After the intake flange 101, the exhaust manifold, the three-way catalytic converter 102 and the outlet flange 103 are connected in sequence, the intake flange 101 and the outlet flange 103 are connected to the corresponding parts of the engine by bolts, and then the exhaust gas generated by the engine enters the four branch air passages 106 in sequence through the intake holes of the intake flange 101. The exhaust gas in each adjacent branch air passage 106 is first merged, and then re-merged when flowing into the main air passage 107. The exhaust manifold 106 and the exhaust gas 107 are combined, so that the exhaust manifold can be designed to be short and compact, thereby saving the length of the manifold stroke and ensuring that the exhaust gas flowing into the three-way catalytic converter 102 can have a higher conversion efficiency. When the exhaust gas enters the main air duct 107, the exhaust gas will be transmitted from the main air duct 107 to the three-way catalytic converter 102, and will be discharged from the outlet of the outlet flange 103 after being purified in the three-way catalytic converter 102, so as to discharge the purified exhaust gas into the atmosphere.

[0031] In summary, the present invention disassembles and sets the collecting plate 104 at the connection between the intake flange 101 and the exhaust manifold, so that during the welding process of the intake flange 101 and the exhaust manifold, the collecting plate 104 can collect the excess welding liquid generated by welding. At the same time, after the welding is completed, the collecting plate 104 can be removed, so that the collecting plate 104 will not affect the subsequent use process. The collecting groove 105 is evenly arranged in a ring shape around the side of the outlet flange 103 close to the three-way catalytic converter 102, so that during the welding process of the three-way catalytic converter 102 and the outlet flange 103, the excess welding liquid will flow into the collecting groove 105 instead of extending along the flange surface of the outlet flange 103, thereby solving the technical problem that after welding of the existing exhaust manifold assembly, the weld extends to the flange surface, resulting in the inability of the bolts to fully contact the flange.

[0032] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An exhaust manifold assembly, characterized in that: It includes an intake flange, an exhaust manifold, a three-way catalytic converter and an outlet flange, wherein the intake flange, the exhaust manifold, the three-way catalytic converter and the outlet flange are connected in sequence, a collecting plate is detachably connected to a side of the intake flange close to the exhaust manifold, the collecting plate is located below the exhaust manifold, and is used for collecting excess welding liquid generated during the welding process of the intake flange and the exhaust manifold, and collecting grooves are evenly distributed on a side of the outlet flange close to the three-way catalytic converter, and are used for collecting excess welding liquid generated during the welding process of the three-way catalytic converter and the outlet flange.

2. The exhaust manifold assembly according to claim 1, characterized in that: The air inlet flange and the exhaust manifold, the exhaust manifold and the three-way catalytic converter, and the three-way catalytic converter and the air outlet flange are all connected by welding.

3. The exhaust manifold assembly according to claim 1, characterized in that: The exhaust manifold includes a branch air passage and a main air passage, the branch air passage is communicated with the intake flange and the main air passage respectively, and the main air passage is communicated with the outlet flange.

4. The exhaust manifold assembly according to claim 3, characterized in that: The number of the branch airways is four, and the adjacent branch airways are in a "Y" shape and merge at the main airway.

5. The exhaust manifold assembly according to claim 1, characterized in that: The collecting plate and the air inlet flange are connected by mutual snap-fitting.

6. The exhaust manifold assembly according to claim 1, characterized in that: The air inlet flange and the air outlet flange are both provided with bolt mounting holes for connecting the air inlet flange or the air outlet flange to corresponding parts of the engine by means of bolts.

7. The exhaust manifold assembly according to claim 6, characterized in that: The collecting tank is arranged between the air outlet hole of the air outlet flange and the bolt mounting hole.

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