Engine exhaust manifold assembly

Abstract

The utility model discloses an engine exhaust manifold assembly, and relates to the technical field of engine exhaust, in particular to an engine exhaust manifold assembly, which comprises a main manifold, a second manifold, a third manifold and a fourth manifold, a second inserting end is arranged at the opening end of the main pipeline part of the auxiliary manifold; an inserting groove is formed in the end part of the first inserting end, the second inserting end is inserted into the inserting groove, and the inner wall and the outer wall of the second inserting end are in clearance fit with the two side walls of the inserting groove respectively; or the end part of the second inserting end is provided with an inserting groove for inserting the first inserting end, and the inner wall and the outer wall of the first inserting end are respectively in clearance fit with the two side walls of the inserting groove; according to the engine exhaust manifold assembly, the inserting groove is formed in the inserting end on one side, the inserting end on the other side is inserted into the inserting groove, the inner wall and the outer wall of the inserting end are in clearance fit with the two side walls of the inserting groove correspondingly, then the sealing performance is improved through two seals, and the problem that the sealing performance is reduced due to high-temperature deformation can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engine exhaust, and more particularly to an engine exhaust manifold assembly. Background Art

[0002] With the continuous improvement of environmental protection requirements, the content of particulate matter PM and NOx in engine exhaust emissions is required to be lower. At the same time, the implementation of the EGR (Exhaust Gas Recirculation) route has led to a significant increase in engine exhaust temperature. In particular, the maximum exhaust temperature of natural gas engines is close to 800°C, making the sealing between exhaust manifolds more difficult.

[0003] If the sealing between the exhaust manifolds is insufficient, it will cause air leakage between the exhaust manifolds, resulting in insufficient exhaust pressure and low EGR rate, which will ultimately affect the engine power and torque.

[0004] In the prior art, the connection between exhaust manifolds is sealed by sealing rings, which are expensive and greatly increase the cost of the engine, and cannot solve the problem of air leakage; or the exhaust manifolds are welded and sealed by bellows, which are made of heat-resistant alloy steel, resulting in an expensive connection method, and the bellows become brittle after being heated, and are easily broken during disassembly and assembly, resulting in high later maintenance costs for the exhaust manifold; furthermore, the connection between exhaust manifolds is connected by gap fit, and the thermal expansion of the exhaust manifold is used for sealing. However, due to the high thermal expansion coefficient of the material or uneven heating of the exhaust manifold, it is easy to cause different deformation amounts at the seal, which in turn leads to air leakage at the seal.

[0005] In summary, how to solve the sealing problem between exhaust manifolds under high-temperature exhaust conditions is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of the present invention is to provide an engine exhaust manifold assembly, by providing a plug-in groove on one side of the plug-in end, inserting the plug-in end on the other side into the plug-in groove, and making the inner and outer walls of the inserted end respectively fit with the gaps on both side walls of the plug-in groove, thereby improving the sealing performance through two seals, and being able to solve the problem of reduced sealing caused by high-temperature deformation.

[0007] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0008] An engine exhaust manifold assembly, comprising:

[0009] A main manifold, wherein the open end of the main pipe portion of the main manifold is provided with a first plug end;

[0010] The secondary manifold has a second plug-in end provided at the open end of its main pipe part; the end of the first plug-in end is provided with a plug-in groove for inserting the second plug-in end, and the inner and outer walls of the second plug-in end are respectively clearance-matched with the two side walls of the plug-in groove; or the end of the second plug-in end is provided with a plug-in groove for inserting the first plug-in end, and the inner and outer walls of the first plug-in end are respectively clearance-matched with the two side walls of the plug-in groove.

[0011] Preferably, a manifold gasket is further included, which is arranged at the open end of the manifold part of the main manifold and / or the auxiliary manifold and is used for sealing between the open end of the manifold part and the cylinder head.

[0012] Preferably, a folded protective ring is provided on the outer periphery of the manifold gasket for wrapping the air intake flange of the manifold part.

[0013] Preferably, the side of the retaining ring is provided with an avoidance opening to eliminate the interference problem between the manifold gasket and other components.

[0014] Preferably, the manifold gasket includes a filling layer and a sealing layer, two groups of the sealing layers are fixedly arranged on both sides of the filling layer, and the retaining ring is fixedly connected to the edge of the filling layer.

[0015] Preferably, the sealing layer is provided with an annular protrusion surrounding the air inlet of the manifold portion, and the protruding direction of the annular protrusion is away from the filling layer.

[0016] Preferably, the open end face of the manifold portion of the main manifold and / or the auxiliary manifold is provided with a positioning column, and the surface of the manifold gasket is provided with a positioning hole for the positioning column to be inserted and positioned; the positioning hole passes through the filling layer and the sealing layer.

[0017] Preferably, the positioning hole is a through hole, and when the positioning post is inserted into the positioning hole, the end face of the positioning post is located between the inner and outer walls of the sealing layer away from the manifold portion.

[0018] Compared with the prior art, the engine exhaust manifold assembly provided by the present invention has at least the following beneficial effects:

[0019] 1. By providing a plug-in slot on the plug-in end on one side of the connection position between the main manifold and the auxiliary manifold, the plug-in end on the other side is inserted into the plug-in slot, and the inner and outer walls of the insertion end are respectively matched with the two side walls of the plug-in slot, thereby improving the sealing performance through two seals;

[0020] 2. When the temperature of the manifold rises and the material deforms, when the temperature of the manifolds on both sides of the plug-in position is close and the deformation is close, the matching relationship between the insertion end and the plug-in slot does not change, which can ensure its air tightness; when the temperature of the insertion end is high and the deformation is greater than the other end, the gap between the outer wall of the insertion end and the inner wall of one side of the plug-in slot is reduced, that is, one of the sealing properties is increased, and you can also solve the problem of decreased air tightness; when the temperature of one end of the plug-in slot is high and the deformation is greater than the other end, the gap between the inner wall of the insertion end and the inner wall of one side of the plug-in slot is reduced, that is, the other sealing property is increased, which can also solve the problem of decreased sealing caused by high temperature deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0022] Figure 1 This is a schematic structural diagram of a specific engine exhaust manifold assembly provided by the present utility model;

[0023] Figure 2 A side view of a specific engine exhaust manifold assembly provided by the present utility model;

[0024] Figure 3 Provided by the utility model Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 This is a schematic structural diagram of the manifold portion provided by the present utility model;

[0026] Figure 5 Provided by the utility model Figure 4 Cross-sectional view at the middle BB;

[0027] Figure 6 This is a schematic structural diagram of a specific manifold gasket provided by the present utility model;

[0028] Figure 7 This is a cross-sectional view of the manifold gasket provided by the present utility model;

[0029] Figure 8 Provided by the utility model Figure 7 Enlarged view of point C in the middle.

[0030] Figures 1-8 middle:

[0031] 1. Main manifold; 11. First plug end; 12. Positioning column;

[0032] 2. Auxiliary manifold; 21. Second plug end;

[0033] 3. Manifold gasket; 31. Positioning hole; 32. Guard ring; 33. Avoidance; 34. Sealing layer; 35. High filling layer; 36. Annular protrusion. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] The core of this utility model is to provide an engine exhaust manifold assembly, by setting a plug-in groove on one side of the plug-in end, inserting the plug-in end on the other side into the plug-in groove, and making the inner and outer walls of the inserted end respectively fit with the gaps on both side walls of the plug-in groove, thereby improving the sealing performance through two seals, and being able to solve the problem of reduced sealing caused by high-temperature deformation.

[0036] Please refer to Figures 1-8 , an engine exhaust manifold assembly, comprising:

[0037] The main manifold 1 has a first plug-in end 11 at the open end of its main pipe portion;

[0038] The secondary manifold 2 has a second plug-in end 21 provided at the open end of its main pipe part; a plug-in groove is provided at the end of the first plug-in end 11 for inserting the second plug-in end 21, and the inner and outer walls of the second plug-in end 21 are respectively clearance-matched with the two side walls of the plug-in groove; or a plug-in groove is provided at the end of the second plug-in end 21 for inserting the first plug-in end 11, and the inner and outer walls of the first plug-in end 11 are respectively clearance-matched with the two side walls of the plug-in groove.

[0039] like Figure 1 As shown, a plug-in groove is provided at the first plug-in end 11 of the main manifold 1 for inserting the second plug-in end 21. At this time, the outer wall of the second plug-in end 21 is loosely matched with the inner wall of the plug-in groove on the outer side, and the inner wall of the second plug-in end 21 is loosely matched with the inner wall of the plug-in groove on the inner side, that is, the outer wall and inner wall of the second plug-in end 21 respectively form sealing surfaces with the two side walls of the plug-in groove, that is, there are two seals at the same time, further improving the sealing performance of the plug-in position;

[0040] When the first plug end 11 and the second plug end 21 are heated and deformed synchronously, the sealing conditions of the two seals will not change, and the airtightness of the plugging position can be guaranteed; if the temperature rise of the first plug end 11 is greater than the temperature rise of the second plug end 21, that is, the deformation of the first plug end 11 is greater than the deformation of the second plug end 21, at this time, the inner wall of the second plug end 21 is tightly fitted with the inner wall of the plug-in slot on the inner side, and the airtightness of the plug-in position can still be guaranteed; if the temperature rise of the second plug end 21 is greater than the temperature rise of the first plug end 11, that is, the deformation of the second plug end 21 is greater than the deformation of the first plug end 11, at this time, the outer wall of the second plug end 21 is tightly fitted with the inner wall of the plug-in slot near the outer side, which can also ensure the airtightness of the plug-in position; and this kind of sealing can prevent air leakage caused by airflow directly scouring the sealing surface;

[0041] At the same time, when the main manifold 1 and the auxiliary manifold 2 are relatively displaced along the centerline of the main pipe due to deformation, the depth of the second plug end 21 inserted into the plug groove changes, but two seals are still present, which has limited impact on the airtightness of the plug position. In other words, the sealing requirements between the manifolds can be met under high-temperature exhaust conditions.

[0042] In some embodiments, a plug-in groove is provided on the end surface of the second plug-in end 21 of the auxiliary manifold 2 for the first plug-in end 11 to be inserted into. The effect is the same as the above effect and will not be repeated.

[0043] In some embodiments, a manifold gasket 3 is further included, which is arranged at the open end of the manifold portion of the main manifold 1 and / or the auxiliary manifold 2 and is used for sealing between the open end of the manifold portion and the cylinder head;

[0044] like Figure 2 and Figure 3 As shown, the air tightness at the air inlet of the manifold part is increased by installing a manifold gasket 3 between the air inlet flange of the manifold part and the engine cylinder head.

[0045] In some embodiments, a folded retainer 32 is provided on the outer periphery of the manifold gasket 3 to wrap the intake flange of the manifold portion;

[0046] like Figure 2 and Figure 6 As shown, by adding a retaining ring 32 around the manifold gasket 3, when the manifold gasket 3 is assembled at the end of the manifold part, the retaining ring 32 can wrap the intake flange of the manifold part to protect the intake flange and prevent it from being affected by high temperature.

[0047] In some embodiments, a side edge of the retaining ring 32 is provided with an avoidance opening 33 to eliminate interference between the manifold gasket 3 and other components;

[0048] like Figure 6As shown, a relief opening 33 is provided at a local position of the retaining ring 32 so that the retaining ring 32 will not interfere with the raised position of the intake flange during installation, and will not interfere with the assembly of other components after the assembly is completed.

[0049] In some embodiments, the manifold gasket 3 includes a filling layer 35 and a sealing layer 34 , two sets of sealing layers 34 are fixedly arranged on both sides of the filling layer 35 , and the retaining ring 32 is fixedly connected to the edge of the filling layer 35 ;

[0050] like Figure 6 and Figure 7 As shown, the manifold gasket 3 has a filling layer 35 as the base layer, and sealing layers 34 are welded on both sides thereof. The sealing layer 34 is used to seal the contact surface, and the filling layer 35 is used to connect the guard ring 32 to ensure the stability of its overall structure.

[0051] In some embodiments, the sealing layer 34 is provided with an annular protrusion 36 surrounding the air inlet of the manifold portion, and the protrusion direction of the annular protrusion 36 is away from the filling layer 35;

[0052] like Figure 6 and Figure 8 As shown, an annular protrusion 36 is provided on the sealing layer 34. During use, the top of the annular protrusion 36 contacts the sealing surface to form a deformation seal, thereby improving the sealing performance of the sealing surface.

[0053] In some embodiments, a positioning post 12 is provided on the open end surface of the manifold portion of the main manifold 1 and / or the auxiliary manifold 2, and a positioning hole 31 is provided on the surface of the manifold gasket 3 for inserting and positioning the positioning post 12; the positioning hole 31 passes through the filling layer 35 and the sealing layer 34;

[0054] like Figure 3-Figure 6 As shown, by providing a positioning hole 31 that passes through the high-filling layer 35 and the sealing layer 34, and using the positioning column 12 on the end face of the open end of the manifold part for insertion and positioning, the relative movement ability of the high-filling layer 35 and the sealing layer 34 perpendicular to the axis direction of the positioning column 12 is limited. That is, during operation, the deformation and delamination of the sealing layer 34 and the high-filling layer 35 caused by high temperature is avoided, thereby ensuring the high-temperature airtightness between the intake flange of the manifold part and the cylinder head.

[0055] In some embodiments, the positioning hole 31 is a through hole. When the positioning post 12 is inserted into the positioning hole 31 , the end surface of the positioning post 12 is located between the inner and outer walls of the sealing layer 34 away from the manifold portion.

[0056] During the design, the thickness of the sealing layer 34 and the filling layer 35 is designed so that the wall thickness of the manifold gasket 3 near the positioning hole 31 is greater than the height of the positioning column 12, and the height of the positioning column 12 is greater than the thickness of one sealing layer 34 and one filling layer 35, and less than the thickness of one filling layer 35 and two sealing layers 34. After the positioning column 12 is inserted, it can limit the relative movement of the two sealing layers 34 and the filling layer 35, and will not cause the positioning column 12 to completely penetrate the manifold gasket 3, that is, the end of the positioning column 12 will not interfere with the cylinder head, thereby ensuring its air tightness.

[0057] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above describes in detail the engine exhaust manifold assembly provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An engine exhaust manifold assembly, characterized in that: include: A main manifold (1), wherein the open end of the main pipe portion thereof is provided with a first plug end (11); The auxiliary manifold (2) has a second plug-in end (21) provided at the open end of its main pipe portion; a plug-in slot is provided at the end of the first plug-in end (11) for inserting the second plug-in end (21), and the inner and outer walls of the second plug-in end (21) are respectively clearance-matched with the two side walls of the plug-in slot; or a plug-in slot is provided at the end of the second plug-in end (21) for inserting the first plug-in end (11), and the inner and outer walls of the first plug-in end (11) are respectively clearance-matched with the two side walls of the plug-in slot.

2. The engine exhaust manifold assembly according to claim 1, characterized in that: It also includes a manifold gasket (3), which is arranged at the open end of the manifold part of the main manifold (1) and / or the auxiliary manifold (2) and is used for sealing between the open end of the manifold part and the cylinder head.

3. The engine exhaust manifold assembly according to claim 2, characterized in that: The outer periphery of the manifold gasket (3) is provided with a folded retaining ring (32) for wrapping the air intake flange of the manifold portion.

4. The engine exhaust manifold assembly according to claim 3, characterized in that: The side of the retaining ring (32) is provided with an avoidance opening (33) for eliminating interference between the manifold gasket (3) and other components.

5. The engine exhaust manifold assembly according to claim 4, characterized in that: The manifold gasket (3) comprises a high filling layer (35) and a sealing layer (34), two groups of the sealing layers (34) are fixedly arranged on both sides of the high filling layer (35), and the retaining ring (32) is fixedly connected to the edge of the high filling layer (35).

6. The engine exhaust manifold assembly according to claim 5, characterized in that: The sealing layer (34) is provided with an annular protrusion (36) surrounding the air inlet of the manifold portion, and the protrusion direction of the annular protrusion (36) is away from the filling layer (35).

7. The engine exhaust manifold assembly according to claim 5, characterized in that: The open end surface of the manifold portion of the main manifold (1) and / or the auxiliary manifold (2) is provided with a positioning column (12), and the surface of the manifold gasket (3) is provided with a positioning hole (31) for inserting and positioning the positioning column (12); the positioning hole (31) passes through the filling layer (35) and the sealing layer (34).

8. The engine exhaust manifold assembly according to claim 7, characterized in that: The positioning hole (31) is a through hole, and when the positioning column (12) is inserted into the positioning hole (31), the end surface of the positioning column (12) is located between the inner and outer walls of the sealing layer (34) away from the manifold portion.

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