Flexible pipe assembly and engine exhaust system

Abstract

A flexible tube assembly includes an outer tube and an inner tube. The outer pipe is provided with a corrugated section, and the corrugated section extends in the axial direction of the outer pipe. The inner pipe is provided with a plurality of lock catch connecting units, and the lock catch connecting units are arranged in the axial direction of the inner pipe and connected with one another. At least two adjacent lock catch connecting units can relatively slide along the axial direction of the inner pipe; and / or at least two adjacent lock catch connecting units can rotate in the circumferential direction of the inner pipe. The flexible tube assembly also includes an annular space between the outer tube and the inner tube. The inner pipe is provided with an air flow cavity, and the lock catch connecting unit is provided with at least one communicating hole communicating the air flow cavity with the annular space. By means of the arrangement, the flexible pipe assembly forms a high-frequency pipe assembly, medium-high frequency noise can be reduced, the noise reduction function is achieved, and the vibration decoupling effect is achieved. The invention further discloses an engine exhaust system with the flexible pipe assembly.

Description

Technical Field

[0001] The present invention relates to a flexible pipe assembly and an engine exhaust system, belonging to the technical field of engine exhaust systems. Background Art

[0002] The engine exhaust system in the related art generally includes a hot end and a cold end, where the hot end is connected to the manifold. The cold end usually includes a front muffler package and a rear muffler package. The muffler package is usually provided with an outer casing, a core pipe located in the outer casing, and an outlet tail pipe. The core pipe and the outer casing form a muffler cavity to improve the NVH performance. The cold end is connected to the hot end through a flexible joint. The flexible joint in the related art only has the function of vibration decoupling.

[0003] However, with the increasing requirements for battery packs in hybrid vehicles, there is a need in the related art to cancel the front muffler package to increase the usable space of the battery pack. However, canceling the front muffler package will inevitably affect the final acoustic performance. Therefore, there is still room for improvement in the exhaust system in the related art. Summary of the Invention

[0004] The purpose of the present invention is to provide a flexible pipe assembly and an engine exhaust system with an improved structure.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A flexible pipe assembly includes an outer pipe and an inner pipe disposed inside the outer pipe; the outer pipe is provided with a corrugated section that extends along the axial direction of the outer pipe; the inner pipe is provided with a plurality of latch connection units that are arranged along the axial direction of the inner pipe and are connected to each other;

[0006] wherein, at least two adjacent latch connection units can relatively slide along the axial direction of the inner pipe; and / or at least two adjacent latch connection units can rotate along the circumferential direction of the inner pipe;

[0007] The flexible pipe assembly further includes an annular space located between the outer pipe and the inner pipe;

[0008] The inner pipe has an air flow cavity, and the latch connection unit is provided with at least one communication hole that communicates the air flow cavity with the annular space.

[0009] As a further improved technical solution of the present invention, each latch connection unit includes a first U-shaped connection part, a second U-shaped connection part, and an intermediate part connecting the first U-shaped connection part and the second U-shaped connection part;

[0010] Two adjacent buckle connection units include a first buckle connection unit and a second buckle connection unit, wherein the second U-shaped connection part of the first buckle connection unit is slidably connected with the first U-shaped connection part of the second buckle connection unit.

[0011] As a further improved technical solution of the present invention, the first U-shaped connection part includes a first plate body part, a second plate body part, a first end part connecting the first plate body part and the second plate body part, and a first installation opening located between the first plate body part and the second plate body part, and the first plate body part and the second plate body part are on the same side of the first end part;

[0012] The second U-shaped connection part includes a third plate body part, a fourth plate body part, a second end part connecting the third plate body part and the fourth plate body part, and a second installation opening located between the third plate body part and the fourth plate body part, and the third plate body part and the fourth plate body part are on the same side of the second end part;

[0013] The second plate body part extends towards the fourth plate body part, the fourth plate body part extends towards the second plate body part, and the middle part connects the first plate body part and the third plate body part;

[0014] At least a part of the fourth plate body part of the first buckle connection unit is inserted into the first installation opening of the second buckle connection unit; at least a part of the second plate body part of the second buckle connection unit is inserted into the second installation opening of the first buckle connection unit.

[0015] As a further improved technical solution of the present invention, the first plate body part of the first buckle connection unit, the third plate body part of the first buckle connection unit, and the middle part are integrally in a Z shape, wherein the second plate body part of the first buckle connection unit is located outside the first plate body part of the first buckle connection unit, the fourth plate body part of the first buckle connection unit is located inside the third plate body part of the first buckle connection unit, and the third plate body part of the first buckle connection unit is located outside the first plate body part of the first buckle connection unit.

[0016] As a further improved technical solution of the present invention, the outer tube includes a first outer fixing tube connected to one end of the corrugated section and a second outer fixing tube connected to the other end of the corrugated section;

[0017] The inner tube includes a first inner fixing tube connected to one end of the several buckle connection units and a second inner fixing tube connected to the other end of the several buckle connection units;

[0018] The first inner fixing tube is fixed in the first outer fixing tube, and the second inner fixing tube is fixed in the second outer fixing tube.

[0019] As a further improved technical solution of the present invention, any two adjacent buckle connection units can relatively slide along the axial direction of the inner tube, and any two adjacent buckle connection units can rotate along the circumferential direction of the inner tube.

[0020] As a further improved technical solution of the present invention, the flexible tube assembly further includes sound-absorbing cotton filled in the annular space.

[0021] As a further improved technical solution of the present invention, each buckle connection unit is provided with a plurality of communication holes that communicate the air flow cavity with the annular space.

[0022] As a further improved technical solution of the present invention, the plurality of communication holes are distributed along the circumferential direction of each buckle connection unit.

[0023] The present invention also discloses an engine exhaust system, which includes the aforementioned flexible tube assembly.

[0024] Compared with the prior art, the flexible tube assembly and the engine exhaust system of the present invention include an outer tube and an inner tube disposed inside the outer tube; the outer tube is provided with a corrugated section that extends along the axial direction of the outer tube; the inner tube is provided with a plurality of buckle connection units, and the plurality of buckle connection units are arranged along the axial direction of the inner tube and are connected to each other. At least two adjacent buckle connection units can relatively slide along the axial direction of the inner tube and / or at least two adjacent buckle connection units can rotate along the circumferential direction of the inner tube; the flexible tube assembly further includes an annular space located between the outer tube and the inner tube; the inner tube has an air flow cavity, and the buckle connection unit is provided with at least one communication hole that communicates the air flow cavity with the annular space. With such a setting, the flexible tube assembly forms a high-frequency tube assembly, which can reduce medium and high-frequency noise, play a sound-absorbing function, and also has a vibration decoupling effect. Description of the Drawings

[0025] Figure 1 is a three-dimensional schematic diagram of the flexible tube assembly of the present invention in one embodiment;

[0026] Figure 2 is along Figure 1 the cross-sectional schematic diagram taken along line A-A in

[0027] Figure 3 is a partial schematic diagram of the inner tube of the flexible tube assembly of the present invention;

[0028] Figure 4 is Figure 2 the partial enlarged view of the circled part B in Detailed Embodiments

[0029] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Among them, if there are several specific embodiments, the features in these embodiments can be combined with each other without conflict. When the description involves the accompanying drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary specific embodiments does not represent all embodiments of the present invention. On the contrary, they are only examples of products that are consistent with those recorded in the claims of the present invention.

[0030] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention. It should be understood that the terms such as "first", "second" and similar words used in the description and claims of the present invention do not represent any order, quantity or importance, but are only used to distinguish the named features.

[0031] Please refer to Figures 1 to 4 As shown, the present invention discloses an engine exhaust system, which includes a flexible pipe assembly 100. The flexible pipe assembly 100 includes an outer pipe 1 and an inner pipe 2 disposed within the outer pipe 1. The outer pipe 1 is provided with a corrugated section 10, and the corrugated section 10 extends along the axial direction of the outer pipe 1. The inner pipe 2 is provided with a plurality of buckle connection units 20, and the plurality of buckle connection units 20 are arranged along the axial direction of the inner pipe 2 and are connected to each other. Among them, at least two adjacent buckle connection units 20 can slide relative to each other along the axial direction of the inner pipe 2; and / or at least two adjacent buckle connection units 20 can rotate circumferentially along the inner pipe 2. In the illustrated embodiment of the present invention, any two adjacent buckle connection units 20 can slide relative to each other along the axial direction of the inner pipe 2, and any two adjacent buckle connection units 20 can rotate circumferentially along the inner pipe 2.

[0032] In the illustrated embodiment of the present invention, the outer pipe 1 includes a first outer fixed pipe 11 connected to one end of the corrugated section 10 and a second outer fixed pipe 12 connected to the other end of the corrugated section 10.

[0033] The inner pipe 2 includes a first inner fixed pipe 21 connected to one end of the plurality of buckle connection units 20 and a second inner fixed pipe 22 connected to the other end of the plurality of buckle connection units 20.

[0034] The first inner fixed pipe 21 is fixed in the first outer fixed pipe 11, and the second inner fixed pipe 22 is fixed in the second outer fixed pipe 12.

[0035] In the illustrated embodiment of the present invention, each latch connection unit 20 includes a first U-shaped connection portion 3, a second U-shaped connection portion 4, and an intermediate portion 5 connecting the first U-shaped connection portion 3 and the second U-shaped connection portion 4.

[0036] Two adjacent latch connection units 20 include a first latch connection unit 20a and a second latch connection unit 20b, wherein the second U-shaped connection portion 4 of the first latch connection unit 20a is slidably connected to the first U-shaped connection portion 3 of the second latch connection unit 20b.

[0037] Specifically, the first U-shaped connection portion 3 includes a first plate portion 31, a second plate portion 32, a first end portion 33 connecting the first plate portion 31 and the second plate portion 32, and a first mounting opening 34 located between the first plate portion 31 and the second plate portion 32. The first plate portion 31 and the second plate portion 32 are located on the same side (e.g., the right side) of the first end portion 33.

[0038] The second U-shaped connection portion 4 includes a third plate portion 41, a fourth plate portion 42, a second end portion 43 connecting the third plate portion 41 and the fourth plate portion 42, and a second mounting opening 44 located between the third plate portion 41 and the fourth plate portion 42. The third plate portion 41 and the fourth plate portion 42 are located on the same side (e.g., the left side) of the second end portion 43.

[0039] The second plate portion 32 extends towards the fourth plate portion 42, the fourth plate portion 42 extends towards the second plate portion 32, and the intermediate portion 5 connects the first plate portion 31 and the third plate portion 41.

[0040] At least a part of the fourth plate portion 42 of the first latch connection unit 20a is inserted into the first mounting opening 34 of the second latch connection unit 20b; at least a part of the second plate portion 32 of the second latch connection unit 20b is inserted into the second mounting opening 44 of the first latch connection unit 20a.

[0041] The first plate portion 31 of the first latch connection unit 20a, the third plate portion 41 of the first latch connection unit 20a, and the intermediate portion 5 are integrally Z-shaped. The second plate portion 32 of the first latch connection unit 20a is located outside the first plate portion 31 of the first latch connection unit 20a, the fourth plate portion 42 of the first latch connection unit 20a is located inside the third plate portion 41 of the first latch connection unit 20a, and the third plate portion 41 of the first latch connection unit 20a is located outside the first plate portion 31 of the first latch connection unit 20a.

[0042] The flexible pipe assembly 100 further includes an annular space 101 located between the outer pipe 1 and the inner pipe 2. The flexible pipe assembly 100 further includes sound-absorbing cotton (not shown) filled in the annular space 101 to improve acoustic performance.

[0043] The inner pipe 2 has an air flow cavity 23, and the latch connection unit 20 is provided with a communication hole 201 that communicates the air flow cavity 23 with the annular space 101. In the illustrated embodiment of the present invention, the communication holes 201 of each latch connection unit 20 are multiple and are circumferentially distributed along the latch connection unit 20.

[0044] Compared with the prior art, the flexible pipe assembly 100 and the engine exhaust system of the present invention include an outer pipe 1 and an inner pipe 2 disposed inside the outer pipe 1; the outer pipe 1 is provided with a corrugated section 10 that extends along the axial direction of the outer pipe 1; the inner pipe 2 is provided with a plurality of latch connection units 20 that are arranged along the axial direction of the inner pipe 2 and are connected to each other. At least two adjacent latch connection units 20 can slide relative to each other along the axial direction of the inner pipe 2 and / or at least two adjacent latch connection units 20 can rotate circumferentially along the inner pipe 2. The flexible pipe assembly 100 further includes an annular space 101 located between the outer pipe 1 and the inner pipe 2; the inner pipe 2 has an air flow cavity 23, and the latch connection unit 20 is provided with at least one communication hole 201 that communicates the air flow cavity 23 with the annular space 101. With such a setting, the flexible pipe assembly 100 forms a high-frequency pipe assembly, which can reduce medium and high-frequency noise, play a sound absorption function, and also has a vibration decoupling effect, improving the NVH performance.

[0045] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art of the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the relevant technical field can still modify the present invention or make equivalent substitutions. All technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims

1. A flexible pipe assembly, characterized in that: The invention comprises an outer tube and an inner tube arranged in the outer tube; the outer tube is provided with a corrugated section, and the corrugated section extends along the axial direction of the outer tube; the inner tube is provided with a plurality of locking connection units, and the plurality of locking connection units are arranged along the axial direction of the inner tube and connected to each other; Wherein, at least two adjacent locking connection units can slide relatively along the axial direction of the inner tube; and / or at least two adjacent locking connection units can rotate along the circumferential direction of the inner tube; The flexible pipe assembly also includes an annular space between the outer pipe and the inner pipe; The inner tube has an airflow cavity, and the lock connection unit is provided with at least one connecting hole connecting the airflow cavity and the annular space.

2. The flexible pipe assembly according to claim 1, characterized in that: Each locking connection unit includes a first U-shaped connection portion, a second U-shaped connection portion, and a middle portion connecting the first U-shaped connection portion and the second U-shaped connection portion; Two adjacent locking connection units include a first locking connection unit and a second locking connection unit, wherein the second U-shaped connection portion of the first locking connection unit is slidably connected with the first U-shaped connection portion of the second locking connection unit.

3. The flexible pipe assembly according to claim 2, characterized in that: The first U-shaped connecting portion includes a first plate body, a second plate body, a first end portion connecting the first plate body and the second plate body, and a first mounting opening located between the first plate body and the second plate body, wherein the first plate body and the second plate body are located on the same side of the first end portion; The second U-shaped connecting portion includes a third plate portion, a fourth plate portion, a second end portion connecting the third plate portion and the fourth plate portion, and a second mounting opening located between the third plate portion and the fourth plate portion, wherein the third plate portion and the fourth plate portion are located on the same side of the second end portion; The second plate portion extends toward the fourth plate portion, the fourth plate portion extends toward the second plate portion, and the middle portion connects the first plate portion and the third plate portion; The fourth plate body of the first locking connection unit is at least partially inserted into the first installation opening of the second locking connection unit; the second plate body of the second locking connection unit is at least partially inserted into the second installation opening of the first locking connection unit.

4. The flexible pipe assembly according to claim 3, characterized in that: The first plate portion of the first locking connection unit, the third plate portion of the first locking connection unit, and the middle portion are overall Z-shaped, wherein the second plate portion of the first locking connection unit is located on the outer side of the first plate portion of the first locking connection unit, the fourth plate portion of the first locking connection unit is located on the inner side of the third plate portion of the first locking connection unit, and the third plate portion of the first locking connection unit is located on the outer side of the first plate portion of the first locking connection unit.

5. The flexible pipe assembly according to claim 1, characterized in that: The outer tube includes a first outer fixed tube connected to one end of the corrugated section and a second outer fixed tube connected to the other end of the corrugated section; The inner tube comprises a first inner fixing tube connected to one end of the plurality of locking connection units and a second inner fixing tube connected to the other end of the plurality of locking connection units; The first internal fixing tube is fixed in the first external fixing tube, and the second internal fixing tube is fixed in the second external fixing tube.

6. The flexible pipe assembly according to claim 1, characterized in that: Any two adjacent locking connection units can slide relatively along the axial direction of the inner tube, and any two adjacent locking connection units can rotate along the circumferential direction of the inner tube.

7. The flexible pipe assembly according to claim 1, characterized in that: The flexible pipe assembly further includes sound absorbing cotton filled in the annular space.

8. The flexible pipe assembly according to claim 1, wherein: Each locking connection unit is provided with a plurality of communication holes connecting the airflow cavity and the annular space.

9. The flexible pipe assembly according to claim 8, characterized in that: The plurality of communication holes are distributed along the circumference of each locking connection unit.

10. An engine exhaust system, characterized in that: A flexible pipe assembly comprising the flexible pipe assembly as claimed in any one of claims 1 to 9.

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