CN213510826U - Multi-section exhaust manifold - Google Patents

Abstract

The utility model belongs to the technical field of engine exhaust manifolds, in particular to a multi-section exhaust manifold, which comprises a first exhaust manifold, a second exhaust manifold and a corrugated pipe; the first exhaust manifold is provided with a first flange of which two ends are connected with the first exhaust pipe and the first connecting pipe, the second exhaust manifold is provided with a second flange of which two ends are connected with the second exhaust pipe and the second connecting pipe, and the first connecting pipe extends into the second connecting pipe. The corrugated pipe is positioned between the first flange and the second flange and comprises a middle corrugated section, a first connecting ring and a second connecting ring, wherein the first connecting ring and the second connecting ring are arranged at two ends of the middle corrugated section; the first connecting ring is sleeved on the side face of the first flange, the second connecting ring is sleeved on the side face of the second flange to form two connecting positions, and the two connecting positions are welded to form two welding seams. The utility model discloses a multistage formula exhaust manifold can form effective reliable sealed between the exhaust manifold, and processing is convenient, low cost.

Description

Multi-section exhaust manifold

Technical Field

The utility model relates to an engine exhaust manifold technical field especially relates to a multistage formula exhaust manifold.

Background

On multi-cylinder natural gas engines, integral exhaust manifolds have gradually exited the market. From the aspect of casting assembly, the integral exhaust manifold inner core outer die is long, and the casting is difficult to ensure the precision; from the analysis in the service behavior, along with the rising of row's temperature, integral exhaust manifold can't release thermal stress, and thermal deformation can increase, has the risk that extrudees damage gasket and body crack failure itself.

At present, a multi-cylinder natural gas engine on the market mostly adopts a sectional type exhaust manifold sealing scheme. The segmented exhaust pipe structure is relatively simplified in the casting process, but the exhaust manifold joint structure has a gas leakage risk. The sealing method of the sectional exhaust manifold mainly comprises the following steps:

patent document 1(CN203856559U) discloses a sealing structure at a joint of a sectional exhaust pipe, which adopts an intermediate exhaust pipe to connect a front-end exhaust pipe and a rear-section exhaust pipe, wherein the end parts of the front-end exhaust pipe and the rear-section exhaust pipe are provided with sealing ring grooves provided with two sealing rings, and an elastic support ring is arranged between the two sealing rings to realize axial sealing; the outer diameter of each sealing ring is larger than the inner diameter of the middle exhaust pipe in a free state, so that radial sealing is realized; however, the seal ring of this structure is likely to be stuck and is likely to leak gas in the radial direction. Patent document 2(CN205990953U) discloses a sealing structure for a sectional exhaust manifold of an engine, in which a spigot is connected to a joint end of two exhaust manifolds, a ring groove formed by a step is provided at the joint of the spigots, and a seal ring is provided in the ring groove. This structure belongs to tang sealing ring scheme, has the gas leakage risk. Patent document 3(CN205383382U) relates to a sectional exhaust manifold connection structure, which adopts an expansion joint to connect two sections of exhaust pipes, and fixes the expansion joint on the exhaust pipe by using a hoop, and belongs to a bellows hoop sealing scheme, and the connection structure has high sealing cost and large required arrangement space.

In summary, exhaust manifold sealing presents the following problems: the sealing ring type sealing structure is easy to deform under the action of high-temperature waste gas, the clamping stagnation phenomenon of the sealing ring occurs, and the thermal deformation of the exhaust manifold cannot be compensated; the clamp type sealing of the corrugated pipe has high cost and large required arrangement space. How to realize effective and reliable sealing at low cost is a problem to be solved in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a multistage formula exhaust manifold, sealed between the exhaust manifold is effective and reliable, and no gas leakage risk, processing and convenient to use are with low costs.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a multistage formula exhaust manifold, include:

the first exhaust manifold comprises a first exhaust pipe, a first flange and a first connecting pipe, wherein two ends of the first flange are respectively connected with the first exhaust pipe and the first connecting pipe;

the second exhaust manifold comprises a second exhaust pipe, a second flange and a second connecting pipe, and two ends of the second flange are respectively connected with the second exhaust pipe and the second connecting pipe; the first connecting pipe extends into the second connecting pipe; and

the corrugated pipe is positioned between the first flange and the second flange and comprises a middle corrugated section, a first connecting ring and a second connecting ring, wherein the first connecting ring and the second connecting ring are connected to two ends of the middle corrugated section; the first connecting ring is sleeved on the first flange and welded with the first flange; the second connecting ring is sleeved on the second flange and welded with the second flange.

As an optimized structure of the present invention, the first connecting pipe and the second connecting pipe are in clearance fit.

As a preferred structure of the utility model, first go up the go-between with first flange passes through laser welding and forms first welding seam, the second go up the go-between with the second flange passes through laser welding and forms the second welding seam.

As an optimized structure of the utility model, the width of first welding seam with the second welding seam is 1.2mm ~ 1.8 mm.

As a preferred structure of the present invention, the first welding line and the second welding line are respectively formed in a closed ring shape by extending the circumferential direction of the first connecting ring and the second connecting ring.

As a preferred structure of the present invention, the first connection ring has a first connection surface with the intermediate corrugated section therebetween, the first flange has a first end surface opposite to the second flange, the first end surface abuts against the first connection surface.

As a preferred structure of the utility model, the second go-between with the second connection face has between the middle ripple section, the second flange have with the second terminal surface that first flange is relative, second terminal surface butt the second is connected the face.

As a preferable structure of the present invention, the inner diameter of the second exhaust pipe is equal to the inner diameter of the first connection pipe.

As a preferred structure of the utility model, the bellows is double-layer corrugated pipe, double-layer corrugated pipe forms through the pressure forming technology suppression.

As a preferred structure of the utility model, the exhaust manifold further comprises an exhaust manifold middle section, a third exhaust manifold and a fourth exhaust manifold; the first exhaust manifold, the second exhaust manifold, the exhaust manifold middle section, the third exhaust manifold and the fourth exhaust manifold are arranged in sequence; the second exhaust manifold and the middle section of the exhaust manifold are welded and sealed through the corrugated pipe; the middle section of the exhaust manifold and the third exhaust manifold are welded and sealed through the corrugated pipe; and the third exhaust manifold and the fourth exhaust manifold are welded and sealed through the corrugated pipe.

The utility model has the advantages that: the utility model provides a multistage formula exhaust manifold, first exhaust manifold have both ends and connect the first flange of first blast pipe and first connecting pipe, and second exhaust manifold has both ends and connects the second flange of second blast pipe and second connecting pipe. The corrugated pipe is positioned between the first flange and the second flange, the connecting rings at two ends of the corrugated pipe are respectively sleeved outside the first flange and the second flange to form two welding seams, the exhaust manifold can be effectively sealed, and the welding seams are arranged outside the flanges to reduce the damage of pressure to the welding seams; the corrugated pipe can play a role in compensating the deformation of the exhaust manifold and contain the thermal deformation of the exhaust manifold under the action of high-temperature waste gas; the first connecting pipe extends into the second connecting pipe, high-temperature waste gas can be well blocked by the insertion type matching between the connecting pipes at the two ends to directly act on the corrugated pipe, the reliability of the corrugated pipe is improved, the processing is convenient, and the cost is low.

Drawings

Fig. 1 is a partial cross-sectional view of a multi-segment exhaust manifold according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a corrugated pipe according to an embodiment of the present invention;

fig. 3 is a partial cross-sectional view of a bellows provided by an embodiment of the present invention;

fig. 4 is a schematic structural view of a multi-section exhaust manifold according to an embodiment of the present invention;

fig. 5 is a sectional view taken along line a-a of fig. 4.

In the figure:

1. a first exhaust manifold; 11. a first flange; 111. a first end face; 12. a first connecting pipe; 13. a first exhaust pipe;

2. a second exhaust manifold; 21. a second flange; 211. a second end face; 22. a second connecting pipe; 23. a second exhaust pipe;

3. a bellows; 31. a first connecting ring; 32. a second connection ring; 33. a first connection face; 34. a second connection face; 35. an intermediate corrugated section;

41. a first weld; 42. a second weld;

5. an exhaust manifold middle section; 6. a third exhaust manifold; 7. a fourth exhaust manifold.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1-5, an embodiment of the present invention provides a multi-sectional exhaust manifold, which includes a first exhaust manifold 1, a second exhaust manifold 2, and a bellows 3. The first exhaust manifold 1 comprises a first flange 11, a first connecting pipe 12 and a first exhaust pipe 13, wherein two ends of the first flange 11 are respectively connected with the first exhaust pipe 13 and the first connecting pipe 12; the second exhaust manifold 2 comprises a second flange 21, a second connecting pipe 22 and a second exhaust pipe 23, and two ends of the second flange 21 are respectively connected with the second exhaust pipe 23 and the second connecting pipe 22; the first connecting pipe 12 projects into the second connecting pipe 22. The corrugated pipe 3 is located between the first flange 11 and the second flange 21, and the corrugated pipe 3 comprises a middle corrugated section 35 and a first connecting ring 31 and a second connecting ring 32 at two ends. The first connecting ring 31 is sleeved on the outer side surface of the first flange 11 to form a first welding position, and the first welding position is welded to form a welding seam 41; the second connecting ring 32 is sleeved on the outer side surface of the second flange 21 to form a second welding position, and the second welding position is welded to form a second welding seam 42. The welding seam sets up the damage that can reduce pressure to the welding seam in the flange lateral wall. Preferably, the first weld 41 and the second weld 42 are formed by laser welding. The corrugated pipe 3, the first exhaust manifold 1 and the second exhaust manifold 2 are welded together in a sealing mode through special-shaped materials of thin-wall parts and thick-wall parts, wherein the corrugated pipe 3 is a thin-wall part, and the first flange 11 and the second flange 21 are thick-wall parts. Compared with traditional electric arc welding, resistance welding and the like, the laser welding has the characteristics of high welding speed, large depth, small deformation and the like, and is more suitable for welding special-shaped materials of thin-wall parts and thick-wall parts. Further preferably, the width of the first weld 41 and the second weld 42 is 1.2mm to 1.8 mm. In the present embodiment, the widths of the first welding seam 41 and the second welding seam 42 are both 1.5mm, which can achieve effective welding and sealing and avoid deformation caused by excessively wide welding seams.

Further, there is a clearance fit between the first connecting tube 12 and the second connecting tube 22. The first connecting pipe 12 is conveniently inserted into the second connecting pipe 22 by adopting clearance fit; on the other hand, high-temperature waste gas can be well prevented from directly acting on the corrugated pipe 3, and the reliability of the corrugated pipe 3 is improved.

Further, the first weld 41 and the second weld 42 extend in the circumferential direction of the first connection ring 31 and the second connection ring 32, respectively, to form a closed ring shape. The closed annular first weld 41 and second weld 42 form an effective seal, ensuring the radial tightness of the first weld and the second weld.

Further, the first connection ring 31 of the bellows 3 has a first connection face 33, the second connection ring 32 has a second connection face 34, and both ends of the intermediate bellows section 35 are connected to the first connection face 33 and the second connection face 34, respectively. As shown in fig. 1, the first connection face 33 is located between the first connection ring 31 and the intermediate corrugated section 35, and the second connection face 34 is located between the second connection ring 32 and the intermediate corrugated section 35. Preferably, the first connection face 33 is perpendicular to the first connection ring 31 and the second connection face 34 is perpendicular to the second connection ring 32.

Further, the first flange 11 has a first end surface 111, the second flange 21 has a second end surface 211, and the first end surface 111 and the second end surface 211 are oppositely disposed. The first end face 111 abuts the first connection face 33 of the corrugated tube 3, and the second end face 211 abuts the second connection face 34 of the corrugated tube 3. By the abutment of the first end surface 111 and the first connection surface 33 and the abutment of the second end surface 211 and the second connection surface 34, a further seal is formed between the bellows 3 and the first and second flanges 11, 21, avoiding damage of the first and second welds 41, 42 by pressure.

Further, the inner diameter of the second exhaust pipe 23 is equal to the inner diameter of the first connection pipe 12. High-temperature gas flows between the first exhaust manifold 1 and the second exhaust manifold 2, the high-temperature gas vibrates if passing through a pipe diameter with an abrupt change in inner diameter, and the pressure at the sealing structure increases abruptly, and this problem can be avoided by designing the second exhaust pipe 23 and the first connecting pipe 12 to have the same inner diameter.

Further, the corrugated tube 3 is a double-layer corrugated tube. The corrugated pipe 3 is divided into an upper layer and a lower layer, and the double-layer corrugated pipe is formed by press-fitting through a pressure forming process. The double-layer thin-wall type corrugated pipe 3 can well play a role in compensating the deformation of the exhaust manifold and contain the thermal deformation of the exhaust manifold generated under the action of high-temperature waste gas.

Further, as shown in fig. 4-5, the multi-section exhaust manifold according to the embodiment of the present invention further includes an exhaust manifold middle section 5, a third exhaust manifold 6 and a fourth exhaust manifold 7, and the first exhaust manifold 1, the second exhaust manifold 2, the exhaust manifold middle section 5, the third exhaust manifold 6 and the fourth exhaust manifold 7 are sequentially arranged. The second exhaust manifold 2 and the middle section 5 of the exhaust manifold are welded and sealed through a corrugated pipe 3; the middle section 5 of the exhaust manifold and the third exhaust manifold 6 are welded and sealed through the corrugated pipe 3; the third exhaust manifold 6 and the fourth exhaust manifold 7 are welded and sealed by the bellows 3, and the structure, the connection form and the welding condition of the sealing are discussed in the foregoing. The connection of the second exhaust manifold 2 to the exhaust manifold middle section 5 is explained as follows: the other end of the second exhaust manifold 2, which is far away from the first exhaust manifold 1, is provided with a first flange 11 and a first connecting pipe 12 which are the same as the first exhaust manifold 1, one end of the exhaust manifold middle section 5, which is near to the second exhaust manifold 2, is provided with a second flange 21 and a second connecting pipe 22 which are the same as the second exhaust manifold 2, the first connecting pipe 12 extends into the second connecting pipe 22, the corrugated pipe 3 is sleeved on the outer side surfaces of the first flange 11 and the second flange 21 to form two welding positions, the two welding positions are welded through laser, a closed annular first welding seam 41 and a closed annular second welding seam 42 are formed, and therefore the connection and the sealing of the second exhaust manifold 2 and the exhaust manifold middle section 5 are completed.

When a plurality of exhaust manifolds are assembled, auxiliary tools can be adopted to control the length of the first connecting pipe 12 extending into the second connecting pipe 22, and the axial distance between the first exhaust manifold 1 and the second exhaust manifold 2 is determined by the cylinder center distance. The specific structure and working principle of the auxiliary tool are well known in the art, and are not described herein. Similarly, when the exhaust manifold middle section 5, the third exhaust manifold 6 and the fourth exhaust manifold 7 are assembled and sealed, the axial distance between the adjacent two exhaust manifolds is also controlled in the same manner.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A multi-section exhaust manifold, comprising:

the first exhaust manifold (1) comprises a first exhaust pipe (13), a first flange (11) and a first connecting pipe (12), and two ends of the first flange (11) are respectively connected with the first exhaust pipe (13) and the first connecting pipe (12);

the second exhaust manifold (2) comprises a second exhaust pipe (23), a second flange (21) and a second connecting pipe (22), and two ends of the second flange (21) are respectively connected with the second exhaust pipe (23) and the second connecting pipe (22); the first connecting pipe (12) extends into the second connecting pipe (22); and

a bellows (3) located between the first flange (11) and the second flange (21), the bellows (3) including an intermediate bellows (35) and first and second connection rings (31, 32) connected to both ends of the intermediate bellows (35); the first connecting ring (31) is sleeved on the first flange (11) and welded with the first flange (11); the second connecting ring (32) is sleeved on the second flange (21) and welded with the second flange (21).

2. The multi-section exhaust manifold according to claim 1, wherein the first connecting tube (12) and the second connecting tube (22) are a clearance fit.

3. The multi-section exhaust manifold according to claim 1, wherein the first connecting ring (31) and the first flange (11) are laser welded to form a first weld (41), and the second connecting ring (32) and the second flange (21) are laser welded to form a second weld (42).

4. The multi-section exhaust manifold according to claim 3, wherein the first and second welds (41, 42) each have a width of 1.2mm to 1.8 mm.

5. The multi-segment exhaust manifold according to claim 3, wherein the first and second weld seams (41, 42) form a closed ring shape extending in a circumferential direction of the first and second connection rings (31, 32), respectively.

6. The multi-section exhaust manifold according to claim 1, wherein the first connection ring (31) and the intermediate bellows (35) have a first connection face (33) therebetween, the first flange (11) having a first end face (111) opposite the second flange (21), the first end face (111) abutting the first connection face (33).

7. The multi-segment exhaust manifold according to claim 1, wherein the second connection ring (32) and the intermediate corrugated segment (35) have a second connection face (34) therebetween, the second flange (21) having a second end face (211) opposite the first flange (11), the second end face (211) abutting the second connection face (34).

8. The multi-section exhaust manifold according to claim 1, wherein the second exhaust pipe (23) has an inner diameter equal to an inner diameter of the first connection pipe (12).

9. The multi-section exhaust manifold according to any one of claims 1 to 8, wherein the corrugated tube (3) is a double-layer corrugated tube, and the double-layer corrugated tube is formed by pressing through a pressure forming process.

10. The multi-section exhaust manifold according to any one of claims 1 to 8 further comprising an intermediate exhaust manifold section (5), a third exhaust manifold (6) and a fourth exhaust manifold (7); the first exhaust manifold (1), the second exhaust manifold (2), the exhaust manifold middle section (5), the third exhaust manifold (6) and the fourth exhaust manifold (7) are arranged in sequence; the second exhaust manifold (2) and the exhaust manifold middle section (5) are welded and sealed through the corrugated pipe (3); the middle exhaust manifold section (5) and the third exhaust manifold (6) are welded and sealed through the corrugated pipe (3); the third exhaust manifold (6) and the fourth exhaust manifold (7) are welded and sealed through the corrugated pipe (3).

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