CN112196638A

CN112196638A - Rebound reed type noise reduction valve of exhaust system

Info

Publication number: CN112196638A
Application number: CN202011053317.3A
Authority: CN
Inventors: 黄华华
Original assignee: Airy Hongtai Shanghai Automotive Technology Co ltd
Current assignee: HARBIN AIRUI EMISSIONS CONTROL TECHNOLOGY Co.,Ltd.
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-01-08

Abstract

The invention provides a rebound reed type noise reduction valve of an exhaust system, and belongs to the field of automobile exhaust noise reduction. The problem of current car silencer volume great, need use electronic equipment cost higher, be difficult for implementing in batches is solved. The valve plug is fixedly connected with the supporting frame, the number of the sliding shaft rods is multiple, one end of each sliding shaft rod is connected with the supporting frame, the other end of each sliding shaft rod is connected with the bottom plate, the valve plug penetrates through the sliding shaft rods to be arranged between the partition plate and the bottom plate, one end of the rebound spring is connected with the valve plug, the other end of the rebound spring is connected with the bottom plate, and the valve plug is tightly attached to the partition plate through the pre-tightening of the rebound spring. The method is mainly used for noise reduction of an automobile exhaust system.

Description

Rebound reed type noise reduction valve of exhaust system

Technical Field

The invention belongs to the field of automobile exhaust and noise reduction, and particularly relates to a rebound reed type noise reduction valve of an exhaust system.

Background

The exhaust low-frequency noise is one of the main sources of low-frequency noise in the vehicle, and if the exhaust low-frequency noise cannot be effectively reduced, the exhaust low-frequency noise can form roaring in the vehicle, so that the quality of the whole vehicle is reduced. Exhaust low frequency noise reduction is typically performed by an exhaust muffler. In order to effectively reduce low frequency noise, the volume of the muffler needs to be large enough, and the large volume of the muffler is limited by the installation space of the chassis, and it is generally difficult to perform spatial arrangement. Meanwhile, the silencer with large volume is heavier, and the manufacturing cost and the weight of the whole automobile are increased.

To reduce exhaust system low frequency noise, new techniques such as active valving and active noise reduction may also be used. The active valve is closed at low speed to block one of the tail pipes, so that the expansion ratio of the silencer is improved, and the low-frequency noise of exhaust can be effectively reduced. The active noise reduction technology principle is that the engine rotating speed is obtained through an automobile CAN bus, meanwhile, the noise characteristics are obtained through a monitoring microphone, a controller calculates sound wave signals in phase opposition to noise in real time according to the information, the sound wave signals are amplified through a power amplifier and then drive a loudspeaker to produce sound, and the phase opposition sound waves and original noise are mutually offset, so that the noise is reduced. The active valve and the active noise reduction both need to use electronic control equipment and mechanical equipment for cooperative action to reduce noise, and although the effect is obvious, the cost is higher, and batch implementation is not easy.

Disclosure of Invention

The invention provides a noise reduction valve of a rebound reed type exhaust system, aiming at solving the problems in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a valve of making an uproar falls in resilience reed formula exhaust system, it includes baffle, braced frame, slip axostylus axostyle, resilience reed, valve end cap and bottom plate, baffle and braced frame fixed connection, slip axostylus axostyle quantity is a plurality of, and the equal one end of a plurality of slip axostylus axostyles links to each other with braced frame, and the other end links to each other with the bottom plate, the valve end cap passes the setting of slip axostylus axostyle between baffle and bottom plate, resilience reed one end links to each other with the valve end cap, and the other.

Furthermore, the upper end of the valve plug is welded with first steel wool.

Furthermore, the lower end of the valve plug is welded with second steel wool.

Furthermore, the lower end of the valve plug is welded with a balancing weight.

Further, the support frame is made of steel bars.

Compared with the prior art, the invention has the beneficial effects that: the invention solves the problems that the existing automobile silencer has larger volume, needs higher cost of electronic equipment and is not easy to implement in batches. When the engine runs at a low rotating speed, the pressure of the exhaust airflow is not enough to offset the pretightening force of the rebound spring, the valve is closed, the expansion ratio of the silencer is improved, and the low-frequency noise reduction capability is improved. When the engine runs at a high rotating speed, the pretightening force of the rebound reed is smaller than the pressure of the exhaust airflow, the rebound reed is opened, the valve is opened, the pressure drop of the silencer is reduced, and the exhaust airflow smoothly circulates, so that the power output of the engine is ensured.

The invention can realize effective noise reduction of low-frequency noise of the exhaust system by installing the valve on the partition plate or the core pipe of the exhaust silencer without influencing the power output of the engine. Compared with the method for reducing the noise of the exhaust low frequency by increasing the volume of the silencer, the volume of the silencer is not required to be increased, the weight of an exhaust system is reduced, and meanwhile, the exhaust silencer is more favorable for being arranged at the position of the chassis; compared with the method for performing exhaust low-frequency noise reduction by using an active valve or an active noise reduction system, the method does not need to use electronic control equipment, and has the advantages of simple structure and low cost.

Drawings

FIG. 1 is a schematic view of a rebound reed type exhaust system noise reduction valve in a closed state according to the present invention;

FIG. 2 is a schematic view of an opening state of a noise reduction valve of a rebound reed type exhaust system according to the present invention.

1-partition board, 2-support frame, 3-sliding shaft lever, 4-rebound reed, 5-valve plug, 6-first steel wool, 7-second steel wool, 8-counterweight block, 9-exhaust airflow and 10-bottom board.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely explained below with reference to the drawings in the embodiments of the present invention.

Referring to fig. 1-2 to illustrate the embodiment, the valve for noise reduction of a rebound reed type exhaust system comprises a partition plate 1, a support frame 2, a sliding shaft rod 3, a rebound reed 4, a valve plug 5 and a bottom plate 10, wherein the partition plate 1 is fixedly connected with the support frame 2, the sliding shaft rods 3 are in a plurality, one end of each of the sliding shaft rods 3 is connected with the support frame 2, the other end of each of the sliding shaft rods 3 is connected with the bottom plate 10, the valve plug 5 penetrates through the sliding shaft rod 3 and is arranged between the partition plate 1 and the bottom plate 10, one end of the rebound reed 4 is connected with the valve plug 5, the other end of the rebound reed 4 is connected with the bottom plate 10, and the valve plug 5 is tightly attached to the.

In this embodiment, when the engine stalls or runs at a low rotation speed, as shown in fig. 1, at this time, there is no exhaust airflow 9 or the exhaust airflow 9 is small, the pretightening force of the rebound reed 4 is greater than the impact force or pressure generated by the exhaust airflow 9, at this time, the valve plug 5 is tightly attached to the partition plate 1 under the pretightening force of the rebound reed 4, at this time, the noise reduction valve is in a closed state, the airflow channel area on the partition plate 1 is small, the muffler is expanded greatly, and the effect of reducing low-frequency noise is achieved. When the engine runs at a high rotating speed, as shown in fig. 2, at this time, the exhaust airflow 9 is large, the pretightening force of the rebound reed 4 is smaller than the pressure of the exhaust airflow 9, the valve plug 5 is pushed by the impact force or pressure generated by the rebound reed 4 to move along the sliding shaft rod 3 to a position away from the partition plate 1, the rebound reed 4 is spread, and at this time, the noise reduction valve is in an open state, the airflow channel area on the partition plate 1 is large, so that the pressure drop of the whole silencer can be reduced, the exhaust airflow 9 is ensured to smoothly pass through, and the power output of.

The first steel wool 6 is welded at the upper end of the valve plug 5 in the embodiment and is used for reducing impact sound generated by collision between the valve plug 5 and the partition plate 1 when the valve is restored to the closed state from the open state. And a second steel wool 7 is welded at the lower end of the valve plug 5 and is used for reducing impact sound generated by collision between the valve plug 5 and the bottom plate 10 when the valve is opened to the maximum angle. The lower end of the valve plug 5 is welded with the balancing weight 8, so that the overall structural strength of the valve plug 5 is improved, and structural radiation noise generated when the valve plug 5 moves along the sliding shaft rod 3 is avoided. The support frame 2 is made of narrow steel bars, plays a role in supporting the whole noise reduction valve and does not influence the flow of the exhaust airflow 9.

The present invention provides a noise reduction valve of a rebound reed type exhaust system, which is described in detail above, and the principle and the implementation mode of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. The utility model provides a valve of making an uproar falls in resilience reed formula exhaust system which characterized in that: it includes baffle (1), braced frame (2), slip axostylus axostyle (3), resilience reed (4), valve end cap (5) and bottom plate (10), baffle (1) and braced frame (2) fixed connection, slip axostylus axostyle (3) quantity is a plurality of, and the equal one end of a plurality of slip axostylus axostyles (3) links to each other with braced frame (2), and the other end links to each other with bottom plate (10), valve end cap (5) pass slip axostylus axostyle (3) and set up between baffle (1) and bottom plate (10), resilience reed (4) one end links to each other with valve end cap (5), and the other end links to each other with bottom plate (10), makes valve end cap (5) hug closely in baffle (1) through.

2. A rebound reed exhaust system noise reduction valve as set forth in claim 1 wherein: the upper end of the valve plug (5) is welded with a first steel wire wool (6).

3. A rebound reed exhaust system noise reduction valve as set forth in claim 1 wherein: and a second steel wool (7) is welded at the lower end of the valve plug (5).

4. A rebound reed exhaust system noise reduction valve as set forth in claim 1 wherein: the lower end of the valve plug (5) is welded with a balancing weight (8).

5. A rebound reed exhaust system noise reduction valve as set forth in claim 1 wherein: the supporting frame (2) is made of steel bars.