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 utility model further discloses an engine exhaust system with the flexible pipe assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of flexible pipe assemblies and engine exhaust system, belong to engine exhaust system technical field. BACKGROUND

[0002] The engine exhaust system in the related art usually includes hot end and cold end, wherein the hot end is connected with manifold. The cold end usually includes front muffler pack and rear muffler pack. The muffler pack is usually provided with outer shell, core pipe in the outer shell and gas outlet tail pipe. The core pipe and the outer shell form a muffling cavity to improve NVH performance. The cold end is connected with the hot end through flexible knot. The flexible knot in the related art only has the function of vibration decoupling.

[0003] However, as the requirement of hybrid electric vehicle on battery pack is higher and higher, there is a demand to cancel the front muffler pack in the related art to increase the use space of battery pack. However, canceling the front muffler pack will inevitably affect the final acoustic performance, so the exhaust system in the related art still has room for improvement. SUMMARY

[0004] The utility model aims at providing a flexible pipe assembly and engine exhaust system with improved structure.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a flexible pipe assembly includes an outer pipe and an inner pipe arranged in the outer pipe. The outer pipe is provided with a corrugated section, which extends along the axial direction of the outer pipe. The inner pipe is provided with a plurality of lock buckle connection units, which are arranged along the axial direction of the inner pipe and connected with each other.

[0006] Among them, at least two adjacent lock buckle connection units can slide along the axial direction of the inner pipe; and / or at least two adjacent lock buckle connection units can rotate along the circumferential direction of the inner pipe.

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

[0008] The inner pipe has a gas flow cavity, and the lock buckle connection unit is provided with at least one communication hole communicating the gas flow cavity and the annular space.

[0009] As a further improved technical scheme of the utility model, each lock buckle 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] The two adjacent lock buckle connecting units comprise a first lock buckle connecting unit and a second lock buckle connecting unit, wherein the second U-shaped connecting part of the first lock buckle connecting unit is slidably connected with the first U-shaped connecting part of the second lock buckle connecting unit.

[0011] As a further improved technical scheme of the utility model, the first U-shaped connecting part comprises 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 mounting opening 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 located on the same side of the first end part.

[0012] The second U-shaped connecting part comprises 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 mounting opening 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 located on the same side of the second end part.

[0013] The second plate body part extends to the fourth plate body part, the fourth plate body part extends to the second plate body part, and the intermediate part connects the first plate body part and the third plate body part.

[0014] The fourth plate body part of the first lock buckle connecting unit is at least partially inserted into the first mounting opening of the second lock buckle connecting unit, and the second plate body part of the second lock buckle connecting unit is at least partially inserted into the second mounting opening of the first lock buckle connecting unit.

[0015] As a further improved technical scheme of the utility model, the first plate body part of the first lock buckle connecting unit, the third plate body part of the first lock buckle connecting unit, and the intermediate part are in Z-shaped as a whole, wherein the second plate body part of the first lock buckle connecting unit is located on the outside of the first plate body part of the first lock buckle connecting unit, the fourth plate body part of the first lock buckle connecting unit is located on the inside of the third plate body part of the first lock buckle connecting unit, and the third plate body part of the first lock buckle connecting unit is located on the outside of the first plate body part of the first lock buckle connecting unit.

[0016] As a further improved technical scheme of the utility model, the outer pipe comprises a first outer fixed pipe connected with one end of the corrugated segment and a second outer fixed pipe connected with the other end of the corrugated segment.

[0017] The inner pipe comprises a first inner fixed pipe connected with one end of the plurality of lock buckle connecting units and a second inner fixed pipe connected with the other end of the plurality of lock buckle connecting units.

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

[0019] As a further improvement of this utility model, any two adjacent locking connection units can slide relative to each other along the axial direction of the inner tube, and any two adjacent locking connection units can rotate along the circumference of the inner tube.

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

[0021] As a further improvement of this utility model, each locking connection unit is provided with several connecting holes that connect the airflow cavity and the annular space.

[0022] As a further improvement of this utility model, the plurality of connecting holes are distributed circumferentially along each locking connection unit.

[0023] This utility model also discloses an engine exhaust system, which includes the aforementioned flexible pipe assembly.

[0024] Compared to existing technologies, the flexible pipe assembly and engine exhaust system of this utility model include an outer pipe and an inner pipe disposed within the outer pipe; the outer pipe has a corrugated section extending axially along the outer pipe; the inner pipe has a plurality of locking connection units arranged axially along the inner pipe and connected to each other. At least two adjacent locking connection units can slide relative to each other along the axial direction of the inner pipe and / or at least two adjacent locking connection units can rotate circumferentially along the inner pipe; the flexible pipe assembly also includes an annular space located between the outer pipe and the inner pipe; the inner pipe has an airflow cavity, and the locking connection units have at least one communicating hole connecting the airflow cavity and the annular space. With this configuration, the flexible pipe assembly forms a high-frequency pipe assembly, which can reduce mid-to-high frequency noise, providing a noise reduction function, and also has a vibration decoupling effect. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the flexible tube assembly of this utility model in one embodiment;

[0026] Figure 2 It is along Figure 1 Schematic diagram of the cross section of line AA;

[0027] Figure 3 This is a partial schematic diagram of the inner tube of the flexible tube assembly of this utility model;

[0028] Figure 4 yes Figure 2 A magnified view of part B circled in the middle. Detailed Implementation

[0029] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Where several specific embodiments exist, features in these embodiments can be combined with each other without conflict. When the description relates to the drawings, unless otherwise stated, the same numbers or symbols in different drawings represent the same or similar elements. The content described in the following exemplary embodiments does not represent all embodiments of this utility model; rather, they are merely examples of products consistent with this utility model and as described in the claims.

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

[0031] Please refer to Figures 1 to 4 As shown, this utility model 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 has a corrugated section 10 extending axially along the outer pipe 1. The inner pipe 2 has a plurality of locking connection units 20, which are arranged axially along the inner pipe 2 and connected to each other. At least two adjacent locking connection units 20 are capable of sliding relative to each other along the axial direction of the inner pipe 2; and / or at least two adjacent locking connection units 20 are capable of rotating circumferentially along the inner pipe 2. In the embodiment illustrated in this utility model, any two adjacent locking connection units 20 are capable of sliding relative to each other along the axial direction of the inner pipe 2, and any two adjacent locking connection units 20 are capable of rotating circumferentially along the inner pipe 2.

[0032] In the embodiment illustrated in this utility model, the outer tube 1 includes a first outer fixing tube 11 connected to one end of the corrugated section 10 and a second outer fixing tube 12 connected to the other end of the corrugated section 10.

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

[0034] The first internal fixation tube 21 is fixed in the first external fixation tube 11, and the second internal fixation tube 22 is fixed in the second external fixation tube 12.

[0035] In the embodiment illustrated in this utility model, each locking connection unit 20 includes a first U-shaped connection part 3, a second U-shaped connection part 4, and an intermediate part 5 connecting the first U-shaped connection part 3 and the second U-shaped connection part 4.

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

[0037] Specifically, the first U-shaped connecting 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 connecting 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 toward the fourth plate portion 42, the fourth plate portion 42 extends toward the second plate portion 32, and the middle portion 5 connects the first plate portion 31 and the third plate portion 41.

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

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

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

[0043] The inner tube 2 has an airflow cavity 23, and the locking connection unit 20 is provided with a connecting hole 201 that connects the airflow cavity 23 and the annular space 101. In the embodiment illustrated in this utility model, each locking connection unit 20 has multiple connecting holes 201, which are distributed circumferentially along the locking connection unit 20.

[0044] Compared to existing technologies, the flexible pipe assembly 100 and engine exhaust system of this utility model include 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, which extends axially along the outer pipe 1; the inner pipe 2 is provided with a plurality of locking connection units 20, which are arranged axially along the inner pipe 2 and connected to each other. At least two adjacent locking connection units 20 are capable of sliding relative to each other along the axial direction of the inner pipe 2 and / or at least two adjacent locking connection units 20 are capable of rotating circumferentially along the inner pipe 2. The flexible pipe assembly 100 also includes an annular space 101 located between the outer pipe 1 and the inner pipe 2; the inner pipe 2 has an airflow cavity 23, and the locking connection unit 20 is provided with at least one communicating hole 201 connecting the airflow cavity 23 and the annular space 101. With this configuration, the flexible tube assembly 100 forms a high-frequency tube assembly, which can reduce mid-to-high frequency noise, play a noise reduction role, and also has a vibration decoupling effect, thereby improving NVH performance.

[0045] The above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A flexible tube assembly, characterized in that, It includes an outer tube and an inner tube disposed within 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 locking connection units that are arranged along the axial direction of the inner tube and connected to each other. Wherein, at least two adjacent locking connection units are capable of sliding relative to each other along the axial direction of the inner tube; and / or at least two adjacent locking connection units are capable of rotating along the circumferential direction of the inner tube; The flexible tube assembly also includes an annular space located between the outer tube and the inner tube; The inner tube has an airflow cavity, and the locking connection unit has at least one communicating hole that connects the airflow cavity and the annular space.

2. The flexible tube assembly as described in claim 1, characterized in that: Each locking connection unit includes a first U-shaped connecting part, a second U-shaped connecting part, and an intermediate part connecting the first U-shaped connecting part and the second U-shaped connecting part; 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 to the first U-shaped connection portion of the second locking connection unit.

3. The flexible tube assembly as described in claim 2, characterized in that: The first U-shaped connecting portion includes a first plate portion, a second plate portion, a first end portion connecting the first plate portion and the second plate portion, and a first mounting opening located between the first plate portion and the second plate portion, wherein the first plate portion and the second plate portion 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 portion of the first locking connection unit is at least partially inserted into the first mounting opening of the second locking connection unit; the second plate portion of the second locking connection unit is at least partially inserted into the second mounting opening of the first locking connection unit.

4. The flexible tube assembly as described in claim 3, characterized in that: The first plate portion, the third plate portion, and the middle portion of the first locking connection unit are generally Z-shaped. The second plate portion of the first locking connection unit is located outside the first plate portion of the first locking connection unit, the fourth plate portion of the first locking connection unit is located inside the third plate portion of the first locking connection unit, and the third plate portion of the first locking connection unit is located outside the first plate portion of the first locking connection unit.

5. The flexible tube assembly as described in claim 1, characterized in that: 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; The inner tube includes 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 fixation tube is fixed in the first external fixation tube, and the second internal fixation tube is fixed in the second external fixation tube.

6. The flexible tube assembly as described in claim 1, characterized in that: Any two adjacent locking connection units can slide relative to each other along the axial direction of the inner tube, and any two adjacent locking connection units can rotate circumferentially along the inner tube.

7. The flexible tube assembly as described in claim 1, characterized in that: The flexible tube assembly also includes sound-absorbing cotton filled in the annular space.

8. The flexible tube assembly as described in claim 1, characterized in that: Each locking connection unit is provided with several connecting holes that connect the airflow cavity and the annular space.

9. The flexible tube assembly as described in claim 8, characterized in that: The plurality of connecting holes are distributed circumferentially along each latching connection unit.

10. An engine exhaust system, characterized in that, Includes the flexible tube assembly as described in any one of claims 1 to 9.

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