CN211874581U - Exhaust bellows assembly and vehicle - Google Patents

Abstract

The utility model provides an exhaust corrugated pipe assembly, which comprises a corrugated pipe, a connecting pipe embedded in the corrugated pipe, and a damping washer sleeved on the corrugated section. The corrugated pipe includes a corrugated section and a connecting section arranged at both ends of the corrugated section; The air inlet end of the pipe is fastened with one end of the connecting section, and the air outlet end of the connecting pipe is suspended in the bellows; a vehicle is also provided, including the aforementioned exhaust bellows assembly, and both ends of the exhaust bellows assembly are sleeved on the bellows. on the outlet exhaust pipe of the supercharger, and welded tightly with the outlet exhaust pipe of the supercharger. The corrugated section of the bellows absorbs high-frequency excitation shock, and the damping gasket vibrates at high frequency and low amplitude in the surface gap of the corrugated section of the bellows, consuming the high-frequency excitation energy absorbed by the corrugated section, so as to achieve high-frequency vibration and noise excitation of the exhaust system. Attenuation, the vibration and noise attenuation frequency of the exhaust bellows assembly is increased from the traditional 200Hz to 1000‑20000Hz or even higher, which is suitable for the exhaust system of the model with the supercharger engine.

Description

Exhaust bellows assembly and vehicle

technical field

The utility model belongs to the field of vehicle exhaust systems, in particular to an exhaust bellows assembly and a vehicle.

Background technique

The exhaust system is an important part of an internal combustion engine vehicle and is responsible for emissions and noise reduction. The exhaust bellows assembly is a flexible element in the exhaust system, which is generally arranged in the exhaust pipe assembly and has the functions of damping vibration transmission, reducing noise and absorbing large-angle displacement.

The existing exhaust bellows assembly includes an end ring, an inner liner, a bellows and a wire mesh. The inner liner is embedded in the bellows, the wire mesh is sleeved outside the bellows, and the end ring is sleeved at the end of the bellows. For connecting to the exhaust line. When the car is running, the exhaust bellows assembly absorbs low-frequency large-angle deformation (below 50Hz) and high-frequency engine vibration (below 200Hz) caused by road excitation or engine torsion through its own flexible deformation. In general, the existing exhaust bellows structure has a relatively obvious damping effect on the vibration excitation below 200Hz.

However, for a model with an engine with a supercharger, the speed range of the supercharger is several thousand to hundreds of thousands of rpm, up to 200,000 rpm, and the corresponding first-order vibration frequency is also several thousand. Between Hz and hundreds of thousands of Hz, the existing exhaust bellows assembly cannot significantly attenuate the vibration excitation problem of this high frequency.

Utility model content

The technical problem to be solved by the present utility model is: in view of the problem that the existing solution cannot significantly attenuate the high-frequency vibration excitation of an engine vehicle with a supercharger, an exhaust bellows assembly and a vehicle are provided. .

In order to solve the above technical problems, an embodiment of the present utility model provides an exhaust bellows assembly, including a bellows, a connecting pipe embedded in the bellows, and a damping washer sleeved on the bellows;

The corrugated pipe includes a corrugated section and a connecting section arranged at both ends of the corrugated section;

The air inlet end of the connecting pipe is fastened with one end of the connecting section, and the air outlet end of the connecting pipe is suspended in the bellows;

Both ends of the exhaust bellows assembly are used to connect to the outlet exhaust pipeline of the supercharger.

Optionally, the damping washer is a stainless steel wire ring.

Optionally, the unilateral thickness of the damping washer is 5±1mm.

Optionally, the number of corrugations in the corrugated section is 3-5.

Optionally, the corrugated pipe is a composite molded part of a three-layer stainless steel pipe body, and the thickness of the single-layer stainless steel pipe body is 0.3-0.5 mm.

Optionally, the connecting pipe is a stainless steel round pipe with a thickness of 0.5-1 mm.

The embodiment of the present invention also provides a vehicle, comprising the aforementioned exhaust bellows assembly, both ends of the exhaust bellows assembly are sleeved on the outlet exhaust pipe of the supercharger, and are tightly coupled with the exhaust bellows. The supercharger outlet exhaust pipeline is welded.

In the exhaust bellows assembly and the vehicle provided by the embodiment of the present invention, the wire mesh sleeved outside the bellows is replaced with a damping washer, and the high-frequency mechanical impact and airflow impact at the outlet of the supercharger pass through the exhaust bellows assembly, The corrugated section of the bellows absorbs high-frequency excitation shock, and the damping gasket vibrates at high frequency and low amplitude in the surface gap of the corrugated section of the bellows, consuming the high-frequency excitation energy absorbed by the corrugated section, so as to achieve high-frequency vibration and noise excitation of the exhaust system. Attenuation, the vibration and noise attenuation frequency of the exhaust bellows assembly is increased from the traditional 200Hz to 1000-20000Hz or even higher, which can effectively realize the high-frequency vibration and noise of the exhaust system of the engine with a supercharger. Attenuation of excitation.

Description of drawings

1 is a schematic structural diagram of an exhaust bellows assembly provided by an embodiment of the present utility model;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the structural representation of the bellows in Fig. 2;

Fig. 4 is the structural schematic diagram of the damping washer in Fig. 2;

FIG. 5 is a reference diagram of the use state of the exhaust bellows assembly provided by the embodiment of the present invention.

The reference numbers in the description are as follows:

1. Corrugated pipe; 11. Corrugated section; 12. Connection section;

2. Connecting pipe; 3. Damping washer; 4. Exhaust pipe at the outlet of the supercharger.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

As shown in FIGS. 1 to 2 , an exhaust bellows assembly provided by an embodiment of the present invention includes a bellows 1 , a connecting pipe 2 embedded in the bellows 1 , and a damping washer sleeved on the bellows section 11 . 3;

The corrugated pipe 1 includes a corrugated section 11 and a connecting section 12 arranged at both ends of the corrugated section 11;

The air inlet end of the connecting pipe 2 is fastened with one end of the connecting section 12 , and the air outlet end of the connecting pipe 2 is suspended in the bellows 1 .

When in use, as shown in Figure 5, both ends of the exhaust bellows assembly are connected to the outlet exhaust pipe 4 of the supercharger. The two large arrows in Figure 5 indicate the outflow direction of the exhaust gas flow, and the small arrows indicate the supercharging. The vibration direction of the exhaust pipe 4 at the outlet of the device and the exhaust bellows assembly.

The specific assembly process can be as follows: firstly, put the damping washer 3 on the surface of the corrugated section 11 of the corrugated pipe 1 to form a combination A, insert the connecting pipe 2 into the combination A to form a combination B, and complete the pre-assembly; The ports are integrally flared from the inside to the outside, so that the inlet end of the connecting pipe 2 and one end of the connecting section 12 are integrally flared, deformed and fastened to complete the assembly of the exhaust bellows assembly.

Compared with the prior art, the exhaust bellows assembly provided by the embodiment of the present invention replaces the wire mesh sleeved outside the bellows with a damping washer 3, and the high-frequency mechanical shock and airflow shock at the outlet of the supercharger pass through the exhaust. In the gas bellows assembly, the corrugated section 11 of the bellows 1 absorbs the high-frequency excitation shock, and the damping washer 3 vibrates at high frequency and low amplitude in the surface gap of the corrugated section 11 of the bellows 1, consuming the high-frequency excitation energy absorbed by the corrugated section 11, In this way, the high-frequency vibration and noise excitation of the exhaust system can be attenuated, and the vibration and noise attenuation frequency of the exhaust bellows assembly can be increased from the traditional 200Hz or less to 1000-20000Hz or even higher, which can effectively achieve the target for engines with superchargers. Attenuation of high-frequency vibration and noise excitation of the exhaust system of the model. The connecting pipe 2 guides the high-temperature exhaust airflow to flow out smoothly, preventing the direct impact contact between the airflow and the bellows 1, resulting in the formation of local turbulence in the corrugated cavity, reducing the airflow noise, and at the same time, it can moderately reduce the working temperature of the bellows 1 and improve the overall exhaust bellows. into the working life.

Preferably, as shown in FIG. 2 , the air outlet end of the connecting pipe 2 is suspended in the connecting pipe 2 , which can completely block the inner side of the corrugated section 11 , prevent the airflow from directly impacting the corrugated section 11 , and better reduce airflow noise.

In one embodiment, as shown in FIG. 2 to FIG. 4 , the damping washer 3 is a stainless steel wire ring profiling molded part, and a compact stainless steel wire ring can be obtained by molding, which meets the heat resistance requirements. The wire mesh sleeved outside the bellows 1 has negligible thickness and quality and only serves as a connection. The damping washer 3 has a certain thickness and quality, which can absorb the excitation energy through damping. On the surface, the damping washer 3 fits well with the corrugated section 11 , which is more conducive to consuming the high-frequency excitation energy absorbed by the corrugated section 11 . A stainless steel wire loop with high lightness and good heat resistance is preferred.

In one embodiment, the single-side thickness of the damping washer 3 is 5±1 mm, which can improve the ability to absorb excitation energy by increasing the damping, and avoid the ability to absorb excitation energy due to excessive thickness.

Specifically, the diameter of the single-strand steel wire of the damping washer 3 may be 0.3±0.1 mm.

In one embodiment, as shown in FIG. 2 and FIG. 3 , the number of corrugations in the corrugated section 11 is 3-5, which is reduced from the conventional number of more than 20 corrugations to 3-5 corrugations, thereby reducing the number of corrugated pipes 1 . The axial length is not only suitable for the spatial arrangement of the exhaust pipe of the outlet section of the close-coupled supercharger, but also improves the stiffness of the bellows 1, increases the resonance frequency, and adapts to high-frequency shocks.

In one embodiment, the corrugated tube 1 is a composite molded part of a three-layer stainless steel tube body, and the thickness of the single-layer stainless steel tube body is 0.3-0.5 mm. To meet the requirements of heat resistance, compared with the existing two-layer bellows 1 with a thickness of 0.15-0.2mm stainless steel tube body, it has greater rigidity, less elasticity, higher resonance frequency, and is suitable for high-frequency impact.

In one embodiment, the connecting pipe 2 is a stainless steel round pipe with a thickness of 0.5-1 mm, which meets the requirements of heat resistance. The shape and thickness of the connecting pipe 2 are basically the same as those of the exhaust pipe at the outlet of the supercharger to guide the high-temperature exhaust gas flow. Flows out smoothly.

The embodiment of the present utility model also provides a vehicle, comprising the exhaust bellows assembly described in any of the foregoing embodiments, the two ends of the exhaust bellows assembly are sleeved on the supercharger outlet exhaust pipe 4, And tightly coupled with the supercharger outlet exhaust pipe 4 welded. When the engine is working, the exhaust bellows assembly absorbs low-frequency large-angle deformation and high-frequency engine vibration through its own flexible deformation.

Specifically, as shown in Figure 5, at the intake end of the exhaust bellows assembly: the inner peripheral wall of the bellows 1 and the intake end of the connecting pipe 2 are welded with the supercharger outlet exhaust pipe 4; The air outlet end of the air bellows assembly: the inner peripheral wall of the bellows 1 is welded with the supercharger outlet exhaust pipe 4, and the connecting pipe 2 is spaced from the supercharger outlet exhaust pipe 4. Ensure the reliable connection between the exhaust bellows assembly and the exhaust pipe 4 at the outlet of the supercharger. The intake end of the connecting pipe 2 is fixed with the connecting section 12 and the exhaust pipe 4 at the outlet of the supercharger. Keep it free to avoid affecting the deformability of the bellows 1.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in the present utility model. within the scope of protection.

Claims (7)

1. An exhaust bellows assembly, comprising a bellows, and the bellows includes a bellows section and a connecting section arranged at both ends of the bellows section; it is characterized in that: it also includes a connecting pipe embedded in the bellows and a damping washer sleeved on the corrugated section; The air inlet end of the connecting pipe is fastened with one end of the connecting section, and the air outlet end of the connecting pipe is suspended in the bellows; Both ends of the exhaust bellows assembly are used to connect to the outlet exhaust pipeline of the supercharger. 2. The exhaust bellows assembly according to claim 1, wherein the damping washer is a stainless steel wire ring. 3 . The exhaust bellows assembly according to claim 2 , wherein the single side thickness of the damping washer is 5±1 mm. 4 . 4 . The exhaust bellows assembly according to claim 1 , wherein the number of corrugations in the corrugated section is 3-5. 5 . 5 . The exhaust bellows assembly according to claim 1 , wherein the bellows is a three-layer stainless steel pipe body composite molded part, and the thickness of the single-layer stainless steel pipe body is 0.3-0.5 mm. 6 . 6 . The exhaust bellows assembly according to claim 1 , wherein the connecting pipe is a stainless steel round pipe with a thickness of 0.5-1 mm. 7 . 7. A vehicle, characterized in that it comprises the exhaust bellows assembly according to any one of claims 1-6, wherein both ends of the exhaust bellows assembly are sleeved on the exhaust gas at the outlet of the supercharger on the pipeline, and tightly coupled with the supercharger outlet exhaust pipeline welded.

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