Exhaust manifold

Abstract

The utility model relates to the technical field of exhaust emission, in particular to an exhaust manifold which comprises a main exhaust pipe, a rectangular pipe shell, a circular ring and a bottom plate. The main exhaust pipe is a seamless rectangular pipe; the rectangular pipe shell corresponds to the exhaust main pipe; the exhaust main pipe is sleeved with the rectangular pipe shell. A plurality of air inlets are formed in the side of the exhaust main pipe; the circular ring is arranged on the air inlet; the bottom plate and the circular ring are fully welded; and the periphery of the bottom plate is intermittently welded with the rectangular tube shell. According to a welding type exhaust manifold on an existing anti-explosion diesel engine, after a bottom plate and an exhaust passage are welded together, a steel pipe is welded and installed, then a shell is installed, and the shell, the bottom plate and the steel pipe are fully welded, so that the welding process is complex, and deformation is large. And when problems occur, the welding can cause the difficulty in maintenance. Compared with the prior art, the bottom plate is used as an independent piece, and most of the bottom plate is welded with the shell of the exhaust manifold through intermittent welding, so that the bottom plate is not easy to deform during welding, and the subsequent maintenance is easier.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas emission, in particular to an exhaust manifold. Background Art

[0002] The exhaust manifold is connected to the engine cylinder block and is a branched pipeline that collects the exhaust gas from each cylinder and guides it into the exhaust main pipe. Its main function is to gather the exhaust gas from each cylinder and guide this exhaust gas to the exhaust pipe and muffler, and finally discharge it into the atmosphere. It also plays an important role in explosion-proof diesel engines. Since explosion-proof diesel engines are mainly used in working environments such as coal mines and underground where combustible gases exist, the exhaust manifold needs to consider its safety performance more.

[0003] At present, the welded exhaust manifolds installed on explosion-proof diesel engines are all bent into a U shape by the outer shell. After the bottom plate is welded to the exhaust passage, the installation steel pipe is welded, and then the outer shell is installed. The outer shell is fully welded to the bottom plate and the steel pipe. In this way, the welding process is complex and the deformation is large. And when problems occur, such welding will also make it difficult to repair. Summary of the Utility Model

[0004] In view of the technical problems of the prior art, the utility model provides an exhaust manifold.

[0005] To solve the above technical problems, the utility model provides the following technical solutions:

[0006] An exhaust manifold includes: an exhaust main pipe, a rectangular pipe outer shell, a ring, and a bottom plate; the exhaust main pipe is a seamless rectangular pipe; the rectangular pipe outer shell corresponds to the exhaust main pipe; the rectangular pipe outer shell is sleeved on the exhaust main pipe; several air inlets are opened on the side of the exhaust main pipe; the ring is arranged on the air inlets; the bottom plate is fully welded to the ring; the outer periphery of the bottom plate is intermittently welded to the rectangular pipe outer shell.

[0007] Further, it also includes: an air outlet flange and a rear seal plate; one end of the rectangular pipe outer shell is connected to the air outlet flange, and the other end is connected to the rear seal plate; the angle between the end face of the air outlet flange and the central axis of the exhaust main pipe is an acute angle.

[0008] Further, an exhaust passage is opened inside the exhaust main pipe; the exhaust passage is communicated with the air inlets; an exhaust port is opened in the middle of the air outlet flange; the exhaust port is communicated with the exhaust passage.

[0009] Further, a water hole is opened on the side of the air outlet flange away from the rear seal plate; water channels are opened on both sides of the rectangular pipe outer shell; the water channels are communicated with the water hole; the water channels are not communicated with the exhaust passage.

[0010] Further, it also includes: an installation steel pipe; the installation steel pipe passes through the bottom plate, the rectangular pipe outer shell, and the exhaust main pipe; the side of the air outlet flange away from the exhaust main pipe is connected to a supercharger through a threaded blind hole.

[0011] Furthermore, the rectangular tube housing is a rectangular steel pipe, made of carbon steel or stainless steel; the bottom plate is a separate piece, made of carbon steel material. Brief Description of the Drawings

[0012] Figure 1 : Schematic structural diagram of the present utility model;

[0013] Figure 2 : Schematic structural diagram of the present utility model after removing the bottom plate;

[0014] Figure 3 : Schematic structural diagram of the main exhaust pipe.

[0015] In the figures: 1, outlet flange; 11, water hole; 12, exhaust port; 2, main exhaust pipe; 21, inlet; 22, exhaust passage; 3, rectangular tube housing; 31, water channel; 4, circular ring; 5, bottom plate; 6, installation steel pipe; 7, rear sealing plate. Detailed Description of the Preferred Embodiments

[0016] The following are specific embodiments of the present utility model in combination with the accompanying drawings, and the technical solutions of the present utility model will be further described, but the present utility model is not limited to these embodiments.

[0017] According to Figures 1-3 , the present utility model provides an exhaust manifold, comprising: an outlet flange 1, a main exhaust pipe 2, a rectangular tube housing 3, a circular ring 4, a bottom plate 5, an installation steel pipe 6, and a rear sealing plate 7.

[0018] The main exhaust pipe 2 is a seamless rectangular pipe. The rectangular tube housing 3 corresponds to the main exhaust pipe 2. The rectangular tube housing 3 is sleeved on the main exhaust pipe 2. A plurality of inlets 21 are opened on the side of the main exhaust pipe 2. The circular ring 4 is arranged on the inlets 21. The bottom plate 5 is fully welded to the circular ring 4. The outer periphery of the bottom plate 5 is intermittently welded to the rectangular tube housing 3. The rectangular tube housing 3 is a rectangular steel pipe, made of carbon steel or stainless steel material. The bottom plate 5 is a separate piece, made of carbon steel material.

[0019] When assembling this exhaust manifold, first fully weld the circular ring 4 to the intake port 21 and the exhaust main pipe 2. The circular ring 4 will bulge on one side of the exhaust main pipe 2. The rectangular pipe housing 3 corresponds to the exhaust main pipe 2. When it is sleeved on the exhaust main pipe 2, it also corresponds to the side of the exhaust main pipe 2 where the circular ring 4 is provided. The rectangular pipe housing 3 has an opening on this side to prevent other parts from fitting against the exhaust main pipe 2 when it is sleeved on the exhaust main pipe 2, while the bulging circular ring 4 abuts against the rectangular pipe housing 3. Then fully weld the bottom plate 5 to the side of the circular ring 4 away from the exhaust main pipe 2, and intermittently weld the outer periphery to the rectangular pipe housing 3. The exhaust main pipe 2 and the rectangular pipe housing 3 of the present utility model are rectangles corresponding to each other. Compared with the U shape, its shape is easier to operate and more convenient for welding and maintenance. And during welding, mainly the circular ring 4 is fully welded to the exhaust main pipe 2 and the bottom plate 5 respectively. The circular ring 4 is small and the welding surface area is small. When welding the bottom plate 5 and the rectangular pipe housing 3, intermittent welding is used. During welding, it is not easy to deform and the welding operation is more convenient. Moreover, the bottom plate 5 is a separate part and can be separated from the exhaust main pipe 2. Intermittent welding is more conducive to disassembly during maintenance and is convenient for overhaul.

[0020] One end of the rectangular pipe housing 3 is connected to the outlet flange 1, and the other end is connected to the rear seal plate 7. The included angle between the end face of the outlet flange 1 and the central axis of the exhaust main pipe 2 is an acute angle. An exhaust passage 22 is opened inside the exhaust main pipe 2. The exhaust passage 22 communicates with the intake port 21. An exhaust port 12 is opened in the middle of the outlet flange 1. The exhaust port 12 communicates with the exhaust passage 22. A water hole 11 is opened on the side of the outlet flange 1 away from the rear seal plate 7. Water channels 31 are opened on both sides of the rectangular pipe housing 3. The water channels 31 communicate with the water hole 11. The water channels 31 do not communicate with the exhaust passage 22. The installation steel pipe 6 passes through the bottom plate 5, the rectangular pipe housing 3, and the exhaust main pipe 2. The side of the outlet flange 1 away from the exhaust main pipe 2 is connected to the supercharger through a blind threaded hole.

[0021] When the exhaust manifold is working, the exhaust gas of the engine enters the exhaust passage 22 from the intake port 21. Since there are multiple intake ports 21, the exhaust gas of multiple cylinders of the engine can be discharged at one time, making the exhaust gas discharge more efficient. After the exhaust gas enters the exhaust passage 22, it is discharged from the exhaust port 12 of the outlet flange 1 and enters the supercharger. Other structures of the engine are often installed above and below the exhaust main pipe 2, and usually one end of the supercharger is long and the other end is short. If the end face of the outlet flange 1 is perpendicular to the central axis of the exhaust main pipe 2, the longer end of the supercharger may be too close to other structures and cause interference. There is a certain angle between the end face of the outlet flange 1 and the central axis of the exhaust main pipe 2 of the present utility model, that is, the outlet flange 1 is inclined relative to the exhaust main pipe 2, so that the supercharger can be installed obliquely along with the outlet flange 1 during installation. Compared with the installation perpendicular to the central axis of the exhaust main pipe 2, the oblique installation makes the space occupied by the supercharger on the upper and lower sides smaller, and correspondingly farther from the structures on the upper and lower sides to avoid interference or conflict with other structures.

[0022] When assembling the exhaust manifold, by installing the steel pipe 6 through the bottom plate 5, the rectangular pipe housing 3 and the exhaust main pipe 2, these three structures can be fixed and the exhaust manifold can be fixed to the engine through the installation of the steel pipe 6. Water channels 31 are also opened on both sides of the rectangular pipe housing 3. The water channels 31 on both sides communicate with each other and are connected to the water holes 11 of the air outlet flange 1, and do not communicate with the exhaust passage 22 to avoid interference. The exhaust gas of a diesel engine is usually generated after combustion and has a relatively high temperature. When passing through the exhaust manifold and the supercharger, it may cause the temperature of these devices to rise. At this time, cold water or coolant can be introduced through the water channels 31. The liquid contacts the exhaust manifold and takes away part of the heat, thereby cooling the device. Part of the liquid can also contact the supercharger through the water holes 11 to reduce its temperature. Part of the liquid flows out of the water channels 31 that have not received water after absorbing the heat in the exhaust manifold. Through the water channels 31 and the water holes 11, the temperature of the exhaust manifold can be effectively controlled to avoid damage to the device caused by high temperature.

[0023] The working principle and usage process of the present utility model:

[0024] When assembling the present utility model, first, the circular ring 4 is fully welded to the air inlet 21 of the exhaust main pipe 2. Then, the rectangular pipe housing 3 is fully welded to the circular ring 4, and then the separate bottom plate 5 is fully welded to the circular ring 4, and the bottom plate 5 and the rectangular pipe housing 3 are intermittently welded. Then, the installation steel pipe 6 is passed through the bottom plate 5, the rectangular pipe housing 3 and the exhaust main pipe 2 for further fixation. When the exhaust manifold is in use, the exhaust gas enters the exhaust passage 22 of the exhaust main pipe 2 from the air inlet 21, then enters the exhaust port 12 of the air outlet flange 1, and enters the supercharger from the exhaust port 12. At the same time, coolant or cold water can be introduced into the water channel 31 on one side of the rectangular pipe housing 3. These cooling liquids will be discharged from the water channel 31 or the water hole 11 on the other side. During the flow of the liquid, part of the heat on the device can be taken away to control the temperature of the device.

[0025] In summary, in the present utility model, by using the bottom plate as a separate part and mostly welding it to the housing of the exhaust manifold through intermittent welding, the bottom plate is not easily deformed during welding and is easier to repair later.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the technical field to which the present utility model belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

Claims

1. An exhaust manifold, characterized in that: Comprising: Exhaust main pipe (2), rectangular pipe housing (3), circular ring (4), bottom plate (5); The exhaust main pipe (2) is a seamless rectangular pipe; The rectangular pipe housing (3) corresponds to the exhaust main pipe (2); The rectangular pipe housing (3) is sleeved on the exhaust main pipe (2); A plurality of air inlets (21) are formed on the side of the exhaust main pipe (2); The circular ring (4) is arranged on the air inlet (21); The bottom plate (5) is fully welded to the circular ring (4); The outer periphery of the bottom plate (5) is intermittently welded to the rectangular pipe housing (3).

2. An exhaust manifold according to claim 1, wherein: It further comprises: an outlet flange (1), a rear sealing plate (7); One end of the rectangular pipe housing (3) is connected to the outlet flange (1), and the other end is connected to the rear sealing plate (7); The included angle between the end face of the outlet flange (1) and the central axis of the exhaust main pipe (2) is an acute angle.

3. An exhaust manifold according to claim 2, wherein: An exhaust passage (22) is formed inside the exhaust main pipe (2); The exhaust passage (22) is communicated with the air inlet (21); An exhaust port (12) is formed in the middle of the outlet flange (1); The exhaust port (12) is communicated with the exhaust passage (22).

4. An exhaust manifold according to claim 3, wherein: A water hole (11) is formed on the side of the outlet flange (1) away from the rear sealing plate (7); Water channels (31) are formed on both sides of the rectangular pipe housing (3); The water channels (31) are communicated with the water hole (11); The water channels (31) are not communicated with the exhaust passage (22).

5. An exhaust manifold according to claim 2, wherein: It further comprises: a mounting steel pipe (6); The mounting steel pipe (6) passes through the bottom plate (5), the rectangular pipe housing (3), and the exhaust main pipe (2); The side of the outlet flange (1) away from the exhaust main pipe (2) is connected to a supercharger through a threaded blind hole.

6. An exhaust manifold according to claim 1, wherein: The rectangular pipe housing (3) is a rectangular steel pipe made of carbon steel or stainless steel; The bottom plate (5) is a separate piece made of carbon steel material.

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