EGR pipeline device, engine assembly and vehicle

Abstract

The invention relates to the technical field of vehicles, and provides an EGR pipeline device, an engine assembly and a vehicle. The heat insulation pipe comprises a first end and a second end, the second end is provided with a first flange in a protruding mode around the first axis of the heat insulation pipe, and the first flange extends in the direction away from the first axis. The first flange is installed at the first end of the heat insulation pipe. The second flange comprises a flange part and a connecting part, a first through hole is formed in the flange part, the connecting part and the flange part are fixed and coaxially arranged, an annular groove is formed in the inner circumferential wall of the connecting part around the second axis of the first through hole, the depth direction of the annular groove is perpendicular to the second axis, and the first flange is inserted into the annular groove; the heat insulation pipe and the second flange are arranged at intervals. And the corrugated pipe is sleeved outside the heat insulation pipe. The heat insulation pipe can reduce the use temperature of the corrugated pipe, a labyrinth structure formed by the first blocking edge and the annular groove can weaken waste gas entering the corrugated pipe, the corrosion progress of the corrugated pipe is slowed down, and then the service life of the corrugated pipe is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and particularly to an EGR pipeline device, an engine assembly and a vehicle. Background Art

[0002] With the increasing prominence of environmental and energy problems, countries have successively formulated more and more stringent emission and fuel consumption regulations. With the turmoil of the world pattern, the rising price of oil and the falling price of natural gas, in the field of heavy commercial vehicles in China, in order to reduce transportation costs, natural gas engines have gradually replaced diesel engines as the mainstream power. However, due to the high exhaust temperature of natural gas engines (about 120°C higher than that of diesel engines), an EGR system needs to be used to control the combustion temperature so that the engine operates within a controllable risk range. In the EGR system, a connecting pipeline needs to be designed between the exhaust manifold and the EGR cooler. Generally, the exhaust pipe and the EGR cooler are connected by a bellows. Due to the high temperature of the transported exhaust gas and the certain corrosiveness of the exhaust gas, the service life of the bellows is relatively low and needs to be replaced frequently.

[0003] Therefore, there is an urgent need for an EGR pipeline device, an engine assembly and a vehicle to solve the above technical problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an EGR pipeline device, an engine assembly and a vehicle, which can reduce the use temperature of the bellows and slow down its corrosion progress, thereby extending the service life of the bellows.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The EGR pipeline device includes:

[0007] A heat insulation pipe, the heat insulation pipe includes a first end and a second end, the second end is convexly provided with a first rib along a first axis of the heat insulation pipe, and the first rib extends in a direction away from the first axis;

[0008] A first flange, the first flange is installed at the first end of the heat insulation pipe;

[0009] A second flange, the second flange is installed at the second end of the heat insulation pipe, the second flange includes a flange portion and a connecting portion, the flange portion is provided with a first through hole, the connecting portion is in a cylindrical structure, the connecting portion and the flange portion are fixed and coaxially arranged, an annular groove is provided on an inner peripheral wall of the connecting portion along a second axis of the first through hole, a depth direction of the annular groove is perpendicular to the second axis, the first rib is inserted into the annular groove, and when the first axis and the second axis are collinear, the heat insulation pipe and the second flange are spaced apart;

[0010] The corrugated pipe is sleeved outside the heat insulation pipe.

[0011] As a preferred technical solution of the above EGR pipeline device, the heat insulation pipe includes a first limiting member, and along the axial direction of the heat insulation pipe, the corrugated pipe is clamped between the first limiting member and the second flange.

[0012] As a preferred technical solution of the above EGR pipeline device, the first end face of the first limiting member in contact with the corrugated pipe and the second end face of the second flange in contact with the corrugated pipe are both parallel to the first connection face of the first flange;

[0013] And / or, the first end face of the first limiting member in contact with the corrugated pipe and the second end face of the second flange in contact with the corrugated pipe are both parallel to the second connection face of the second flange.

[0014] As a preferred technical solution of the above EGR pipeline device, the first connection face of the first flange and the second connection face of the second flange are perpendicular or parallel.

[0015] As a preferred technical solution of the above EGR pipeline device, the first flange is provided with a first connection hole A, the second flange is provided with a second connection hole, both the first connection hole A and the second connection hole are waist-shaped holes, and the central plane of the first connection hole A and the central plane of the second connection hole are perpendicular.

[0016] As a preferred technical solution of the above EGR pipeline device, the first flange is further provided with a first connection hole B, the first connection hole B is a round hole, the first connection hole B is configured with a threaded fastener, and the diameter of the first connection hole B is greater than the outer diameter of the threaded fastener.

[0017] As a preferred technical solution of the above EGR pipeline device, in the axial projection perpendicular to the corrugated pipe, the two side edges in the axial direction of the corrugated pipe are located inside the two side edges in the axial direction of the heat insulation pipe.

[0018] As a preferred technical solution of the above EGR pipeline device, in the direction perpendicular to the axial direction of the heat insulation pipe, the outer peripheral wall of the heat insulation pipe and the inner peripheral wall of the corrugated pipe are arranged at intervals.

[0019] An engine assembly is further provided, which includes an engine and the above EGR pipeline device, and the EGR pipeline device is installed on the engine.

[0020] A vehicle is further provided, which includes the above engine assembly.

[0021] Advantages of the present invention:

[0022] The present invention provides an EGR pipeline device, which includes a heat-insulating pipe, a first flange, a second flange, and a corrugated pipe. Among them, the heat-insulating pipe includes a first end and a second end. The second end is convexly provided with a first stop edge around the first axis of the heat-insulating pipe, and the first stop edge extends in a direction away from the first axis; the first flange is installed at the first end of the heat-insulating pipe; the second flange is installed at the second end of the heat-insulating pipe. The second flange includes a flange portion and a connecting portion. The flange portion is provided with a first through hole. The connecting portion has a cylindrical structure. The connecting portion and the flange portion are fixed and coaxially arranged. An annular groove is provided on the inner peripheral wall of the connecting portion around the second axis of the first through hole. The depth direction of the annular groove is perpendicular to the second axis. The first stop edge is inserted into the annular groove. When the first axis and the second axis are collinear, the heat-insulating pipe and the second flange are arranged at intervals; the corrugated pipe is sleeved outside the heat-insulating pipe.

[0023] Exemplarily, the heat-insulating pipe includes a first end and a second end in its axial direction. The first end is used to connect with the first flange, and the first flange is used to connect with the first connected part; the second end is used to connect with the second flange, and the second flange is used to connect with the second connected part. The second end has a reduced-diameter structure, including a small-diameter section and a large-diameter section. The small-diameter section and the large-diameter section are fixed, and the large-diameter section is located at the side edge of the second end facing away from the first end. The large-diameter section is the first stop edge; the second flange includes a flange portion and a connecting portion. An annular groove is provided on the inner peripheral wall of the connecting portion. The annular groove includes a bottom wall and two side walls. The radius of the annular region formed by the bottom wall of the annular groove is greater than the outer diameter of the large-diameter section of the heat-insulating pipe. The large-diameter section is inserted into the annular groove. When the first axis and the second axis are collinear, the large-diameter section of the heat-insulating pipe and the bottom wall of the annular groove are arranged at intervals, and the width of the annular groove is greater than the thickness of the large-diameter section. Then, the large-diameter section can be arranged at intervals with both side walls of the annular groove or abutted against one of the side walls. The second end of the heat-insulating pipe and the connecting portion of the second flange form a labyrinth structure. The corrugated pipe is sleeved outside the heat-insulating pipe. The heat-insulating pipe can reduce the operating temperature of the corrugated pipe. The labyrinth structure can weaken the entry of exhaust gas into the corrugated pipe, slow down the corrosion progress of the corrugated pipe, and thus extend the service life of the corrugated pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the content of the embodiments of the present invention and these drawings.

[0025] Figure 1 is a schematic structural diagram of the EGR pipeline device provided by the embodiment of the present invention;

[0026] Figure 2 is a cross-sectional view of the EGR pipeline device provided by the embodiment of the present invention;

[0027] Figure 3 is Figure 2 The partial enlarged view of position A in the figure.

[0028] In the figure:

[0029] 100, heat insulation pipe; 101, the first axis; 110, the first end; 120, the second end; 121, the first edge; 130, the first limiting member;

[0030] 200, the first flange; 210, the first connection surface; 220, the first connection hole A; 230, the first connection hole B;

[0031] 300, the second flange; 301, the second axis; 310, the flange part; 311, the first through hole; 312, the second connection surface; 313, the second connection hole; 320, the connection part; 321, the annular groove;

[0032] 400, corrugated pipe. Detailed implementation manners

[0033] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention rather than all the structures are shown in the drawings.

[0034] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top", and "on the top" of the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom", and "under the bottom" of the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature is at a lower horizontal height than the second feature.

[0036] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0037] As Figures 1 to 3 shown, the present invention provides an EGR pipeline device, which includes a heat-insulating pipe 100, a first flange 200, a second flange 300 and a corrugated pipe 400. Among them, the heat-insulating pipe 100 includes a first end 110 and a second end 120. The second end 120 is convexly provided with a first flange 121 around the first axis 101 of the heat-insulating pipe 100, and the first flange 121 extends in a direction away from the first axis 101; the first flange 200 is installed at the first end 110 of the heat-insulating pipe 100; the second flange 300 is installed at the second end 120 of the heat-insulating pipe 100. The second flange 300 includes a flange portion 310 and a connecting portion 320. The flange portion 310 is provided with a first through hole 311. The connecting portion 320 has a cylindrical structure. The connecting portion 320 is fixed and coaxially arranged with the flange portion 310. An annular groove 321 is provided on the inner peripheral wall of the connecting portion 320 around the second axis 301 of the first through hole 311. The depth direction of the annular groove 321 is perpendicular to the second axis 301. The first flange 121 is inserted into the annular groove 321. When the first axis 101 and the second axis 301 are collinear, the heat-insulating pipe 100 and the second flange 300 are arranged at intervals; the corrugated pipe 400 is sleeved outside the heat-insulating pipe 100.

[0038] Exemplarily, the heat-insulating pipe 100 includes a first end 110 and a second end 120 along its axial direction. The first end 110 is used to connect with the first flange 200, and the first flange 200 is used to connect with the first connected part; the second end 120 is used to connect with the second flange 300, and the second flange 300 is used to connect with the second connected part. The second end 120 is a stepped structure, including a small-diameter section and a large-diameter section. The small-diameter section is fixed to the large-diameter section, and the large-diameter section is located at the side edge of the second end 120 facing away from the first end 110. The large-diameter section is the first edge 121; the second flange 300 includes a flange portion 310 and a connecting portion 320. An annular groove 321 is formed on the inner peripheral wall of the connecting portion 320. The annular groove 321 includes a bottom wall and two side walls. The radius of the annular region formed with the bottom wall of the annular groove 321 as the edge contour is greater than the outer diameter of the large-diameter section of the heat-insulating pipe 100. The large-diameter section is inserted into the annular groove 321. When the first axis 101 is collinear with the second axis 301, the large-diameter section of the heat-insulating pipe 100 is spaced from the bottom wall of the annular groove 321, and the width of the annular groove 321 is greater than the thickness of the large-diameter section. Then, the large-diameter section can be spaced from both side walls of the annular groove 321 or abutted against one of the side walls. The connection between the second end 120 of the heat-insulating pipe 100 and the connecting portion 320 of the second flange 300 forms a labyrinth structure. The corrugated pipe 400 is sleeved outside the heat-insulating pipe 100. The heat-insulating pipe 100 can reduce the operating temperature of the corrugated pipe 400. The labyrinth structure can weaken the entry of waste gas into the corrugated pipe 400 and slow down the corrosion progress of the corrugated pipe 400, thereby extending the service life of the corrugated pipe 400.

[0039] Further, the first end 110 of the heat-insulating pipe 100 is fixedly welded to the first flange 200.

[0040] Further, the first end 110 of the heat-insulating pipe 100 and the first flange 200 are integrally formed.

[0041] Optionally, the heat-insulating pipe 100 includes a first limiting member 130. Along the axial direction of the heat-insulating pipe 100, the corrugated pipe 400 is clamped between the first limiting member 130 and the second flange 300.

[0042] Exemplarily, a first limiting member 130 protrudes from the outer peripheral wall of the heat-insulating pipe 100. The first limiting member 130 is located between the first end 110 and the second end 120 of the heat-insulating pipe 100. After the heat-insulating pipe 100 is assembled with the second flange 300, a limiting groove is formed between the first end surface of the first limiting member 130 and the second end surface on the side of the connecting portion 320 of the second flange 300 facing away from the flange portion 310. The corrugated pipe 400 is sleeved outside the heat-insulating pipe 100 and the corrugated pipe 400 is placed in the limiting groove. One end surface of the corrugated pipe 400 in the axial direction abuts against the first end surface, and the other end surface abuts against the second end surface. In this way, the corrugated pipe 400 is limited by the first end surface and the second end surface, so that the corrugated pipe 400 is relatively fixed to the heat-insulating pipe 100.

[0043] Further, the first limiting member 130 has an annular structure and is convexly formed around the first axis 101 of the heat insulation pipe 100.

[0044] Optionally, the first end surface of the first limiting member 130 in contact with the corrugated pipe 400 and the second end surface of the second flange 300 in contact with the corrugated pipe 400 are both parallel to the first connection surface 210 of the first flange 200; and / or, the first end surface of the first limiting member 130 in contact with the corrugated pipe 400 and the second end surface of the second flange 300 in contact with the corrugated pipe 400 are both parallel to the second connection surface 312 of the second flange 300.

[0045] Exemplarily, when the first connection surface 210 of the first flange 200 is perpendicular to the second connection surface 312 of the second flange 300, the first end surface of the first limiting member 130 in contact with the corrugated pipe 400 and the second end surface of the second flange 300 in contact with the corrugated pipe 400 are both parallel to the first connection surface 210 of the first flange 200; or, the first end surface of the first limiting member 130 in contact with the corrugated pipe 400 and the second end surface of the second flange 300 in contact with the corrugated pipe 400 are both parallel to the second connection surface 312 of the second flange 300. When the first connection surface 210 of the first flange 200 is parallel to the second connection surface 312 of the second flange 300, the first end surface of the first limiting member 130, the second end surface of the second flange 300, the first connection surface 210 of the first flange 200, and the second connection surface 312 of the second flange 300 are all parallel. In this way, it is convenient to improve the design accuracy and installation convenience.

[0046] Optionally, the first connection surface 210 of the first flange 200 and the second connection surface 312 of the second flange 300 are perpendicular or parallel. Exemplarily, the first connection surface 210 of the first flange 200 is used for contact connection with the first connected member, and the second connection surface 312 of the second flange 300 is used for connection with the second connected member. The perpendicular or parallel arrangement of the first connection surface 210 and the second connection surface 312 is convenient to improve the design accuracy and installation convenience.

[0047] Optionally, the first flange 200 is provided with a first connection hole A220, and the second flange 300 is provided with a second connection hole 313. Both the first connection hole A220 and the second connection hole 313 are waist-shaped holes, and the central planes of the first connection hole A220 and the second connection hole 313 are perpendicular.

[0048] Exemplarily, the first flange 200 is provided with a first connection hole A220 on the first connection surface 210. The first connection hole A220 is an oval hole that penetrates the first connection surface 210. The depth direction of the first connection hole A220 is perpendicular to the first connection surface 210. The first connection hole A220 is used for inserting a threaded fastener, and the threaded fastener can move relative to the first flange 200 along the length direction of the first connection hole A220. The second flange 300 is provided with a second connection hole 313 on the second connection surface 312. The second connection hole 313 is an oval hole that penetrates the second connection surface 312. The depth direction of the second connection hole 313 is perpendicular to the second connection surface 312. The second connection hole 313 is used for inserting a threaded fastener, and the threaded fastener can move relative to the second flange 300 along the length direction of the second connection hole 313. Further, since the central plane of the first connection hole A220 is perpendicular to the central plane of the second connection hole 313, the length direction of the first connection hole A220 is perpendicular to the length direction of the second connection hole 313. In this way, the compensation during the assembly of the EGR pipeline device and the connected part can be achieved.

[0049] Optionally, the first flange 200 is further provided with a first connection hole B230. The first connection hole B230 is a round hole, and a threaded fastener is arranged in the first connection hole B230, and the aperture of the first connection hole B230 is larger than the outer diameter of the threaded fastener.

[0050] Exemplarily, the first flange 200 is provided with a first connection hole B230 on the first connection surface 210. The first connection hole B230 is a circular hole that penetrates the first connection surface 210. The depth direction of the first connection hole B230 is perpendicular to the first connection surface 210. The first connection hole B230 is used for inserting a threaded fastener, and the aperture of the first connection hole B230 is larger than the outer diameter of the threaded fastener. The threaded fastener can move relative to the first flange 200 in the axial direction perpendicular to the first connection hole B230 within the first connection hole B230. In this way, the compensation during the assembly of the EGR pipeline device and the connected part can be achieved.

[0051] Optionally, in the axial projection perpendicular to the bellows 400, the two axial edges of the bellows 400 are located within the two axial edges of the heat insulation pipe 100.

[0052] Exemplarily, in the projection perpendicular to the axial direction of the corrugated pipe 400, the two axial side edges of the heat insulation pipe 100 are respectively denoted as the first edge line A and the first edge line B, and the two axial side edges of the corrugated pipe 400 are respectively denoted as the second edge line A and the second edge line B, and it is satisfied that along the axis of the heat insulation pipe 100, the first edge line A, the second edge line A, the second edge line B, and the first edge line B are arranged in sequence. That is, the length of the heat dissipation pipe is greater than the length of the corrugated pipe 400. After the corrugated pipe 400 is sleeved on the heat dissipation pipe, both the axial head and tail ends of the heat dissipation pipe can extend out of the corrugated pipe 400, and the heat dissipation pipe can act on all of the corrugated pipe 400.

[0053] Optionally, in the direction perpendicular to the axial direction of the heat insulation pipe 100, the outer peripheral wall of the heat insulation pipe 100 and the inner peripheral wall of the corrugated pipe 400 are arranged at intervals.

[0054] Exemplarily, the inner diameter of the corrugated pipe 400 is greater than the outer diameter at the bottom wall of the limiting groove of the heat insulation pipe 100. Thus, when the corrugated pipe 400 is sleeved on the heat insulation pipe 100, the inner peripheral wall of the corrugated pipe 400 and the outer peripheral wall of the heat insulation pipe 100 are arranged at intervals, reducing the heat transfer efficiency and improving the heat insulation performance.

[0055] An engine assembly is further provided, including an engine and the above-mentioned EGR pipeline device, and the EGR pipeline device is installed on the engine.

[0056] A vehicle is further provided, including the above-mentioned engine assembly.

[0057] In addition, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An EGR pipeline device, characterized in that, Comprising: A heat-insulating pipe (100), the heat-insulating pipe (100) includes a first end (110) and a second end (120), a first stop edge (121) protrudes from the second end (120) around the first axis (101) of the heat-insulating pipe (100), and the first stop edge (121) extends in a direction away from the first axis (101); A first flange (200), the first flange (200) is installed at the first end (110) of the heat-insulating pipe (100); A second flange (300), the second flange (300) is installed at the second end (120) of the heat-insulating pipe (100), the second flange (300) includes a flange portion (310) and a connecting portion (320), a first through hole (311) is formed in the flange portion (310), the connecting portion (320) has a cylindrical structure, the connecting portion (320) is fixedly and coaxially arranged with the flange portion (310), a ring groove (321) is formed in the inner peripheral wall of the connecting portion (320) around the second axis (301) of the first through hole (311), the depth direction of the ring groove (321) is perpendicular to the second axis (301), the first stop edge (121) is inserted into the ring groove (321), and when the first axis (101) and the second axis (301) are collinear, the heat-insulating pipe (100) and the second flange (300) are spaced apart; A corrugated pipe (400), the corrugated pipe (400) is sleeved outside the heat-insulating pipe (100).

2. The EGR pipeline device according to claim 1, wherein The heat-insulating pipe (100) includes a first limiting member (130), along the axial direction of the heat-insulating pipe (100), the corrugated pipe (400) is clamped between the first limiting member (130) and the second flange (300).

3. The EGR pipeline device according to claim 2, characterized in that The first end face of the first limiting member (130) in contact with the corrugated pipe (400) and the second end face of the second flange (300) in contact with the corrugated pipe (400) are both parallel to the first connection surface (210) of the first flange (200); And / or, the first end face of the first limiting member (130) in contact with the corrugated pipe (400) and the second end face of the second flange (300) in contact with the corrugated pipe (400) are both parallel to the second connection surface (312) of the second flange (300).

4. The EGR pipeline device according to claim 1, characterized in that The first connection surface (210) of the first flange (200) and the second connection surface (312) of the second flange (300) are perpendicular or parallel.

5. The EGR pipeline device according to claim 1, characterized in that, The first flange (200) is provided with a first connection hole A (220), the second flange (300) is provided with a second connection hole (313), both the first connection hole A (220) and the second connection hole (313) are waist-shaped holes and the central planes of the first connection hole A (220) and the second connection hole (313) are perpendicular.

6. The EGR pipeline device according to claim 5, wherein, The first flange (200) is further provided with a first connection hole B (230), the first connection hole B (230) is a circular hole, the first connection hole B (230) is configured with a threaded fastener, and the aperture of the first connection hole B (230) is larger than the outer diameter of the threaded fastener.

7. The EGR pipeline device according to claim 1, wherein, In the axial projection perpendicular to the bellows (400), the two axial edges of the bellows (400) are located within the two axial edges of the heat insulation pipe (100).

8. The EGR pipeline device according to claim 1, characterized in that, In the axial direction perpendicular to the heat insulation pipe (100), the outer peripheral wall of the heat insulation pipe (100) is spaced from the inner peripheral wall of the bellows (400).

9. Engine assembly, characterized in that, It includes an engine and the EGR pipeline device according to any one of claims 1-8, and the EGR pipeline device is installed on the engine.

10. A vehicle, characterized in that, It includes the engine assembly according to claim 9.

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