CN111350564A

CN111350564A - Exhaust silencer for a motor vehicle

Info

Publication number: CN111350564A
Application number: CN201811582238.4A
Authority: CN
Inventors: 刘金瓒
Original assignee: Qoros Automotive Co Ltd
Current assignee: Qoros Automotive Co Ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2020-06-30

Abstract

The invention discloses an exhaust silencer for an automobile, which comprises a silencer cylinder body with a plurality of chambers, an air outlet pipe and a capillary pipe, wherein the air outlet pipe extends from a primary chamber and extends to the outside of the silencer cylinder body through a secondary chamber and consists of a pressure-changing pipeline and a drainage pipeline. The inlet of the pressure-changing pipeline is positioned in the primary cavity, the outlet of the pressure-changing pipeline is connected to the inlet of the drainage pipeline, and the outlet of the drainage pipeline is positioned outside the silencer cylinder and communicated with the atmosphere. One end of the capillary tube is communicated with the adjacent inlet of the drainage pipeline, the other end of the capillary tube is positioned at the bottom of the chamber where the inlet of the drainage pipeline is positioned, and the pressure change pipeline can enable the air pressure difference between the outlet and the inlet to be larger than the air pressure difference between the outlet and the first-stage chamber. According to the exhaust silencer for the automobile, the condensed water in the silencer can be continuously discharged under the condition that the barrel structure of the silencer is not changed, and any adverse effect on the original performance of the exhaust silencer is avoided.

Description

Exhaust silencer for a motor vehicle

Technical Field

The invention relates to automobile parts, in particular to an exhaust silencer for an automobile.

Background

As is well known, in various countries around the world, there are strict regulations on the limit value of noise generated by various vehicles, and an exhaust muffler for an automobile is a device for reducing exhaust noise generated in order to meet the regulations on noise. Generally, exhaust mufflers eliminate or reduce noise by reducing, attenuating, pulsations in the exhaust gas pressure. Exhaust mufflers generally achieve noise reduction by absorbing and reflecting two basic muffling methods, wherein absorbing muffling consumes energy of exhaust gas by friction on sound-absorbing materials such as glass fiber, steel fiber, and asbestos, and reflecting muffling is a method in which a plurality of tuning cavities connected in series are arranged, and vibration is reduced and energy of exhaust gas is consumed by multiple reflections, collisions, expansions, and cooling that the exhaust gas undergoes. At present, most automobile manufacturers design the specific structure of the exhaust muffler by comprehensively utilizing different noise elimination modes in a combined manner.

In addition, the exhaust muffler is used as a part of an automobile exhaust pipeline and the smooth exhaust of the exhaust muffler is ensured. However, water vapor generated during combustion of the automobile engine condenses into water while passing through the exhaust muffler, and forms accumulated water in the exhaust muffler. In order to discharge condensed water, the conventional automobile exhaust muffler generally adopts the following two designs. The first method is to discharge the condensed water in the exhaust muffler by using a siphon, but this method is limited by the engine operating condition and cannot ensure that the condensed water is continuously discharged. The second is that the barrel bottom of exhaust silencer directly punches the drainage, and this kind of mode can guarantee that the comdenstion water can be continuously discharged, but the silencer barrel leads to the sealing performance of exhaust silencer not good after punching, and the hole department of drainage corrodes easily to the comdenstion water is discharged in the vehicle bottom through the drain hole, may lead to the car owner to mistake and think that the trouble that the fluid was revealed takes place for the vehicle.

Accordingly, there is a need for a new exhaust muffler design for an automobile that eliminates the above-mentioned drawbacks of the existing exhaust mufflers.

Disclosure of Invention

The invention aims to solve the technical problem that the existing automobile exhaust silencer cannot guarantee continuous discharge of internal condensed water or the sealing performance of the exhaust silencer is poor due to punching, and provides an exhaust silencer for an automobile.

The invention solves the technical problems by adopting the following technical scheme:

the present invention provides an exhaust muffler for an automobile, comprising:

a muffler cylinder having a plurality of chambers partitioned by perforated partitions, the chambers including a primary chamber communicating with an intake pipe of an automobile and a secondary chamber located outside the primary chamber, and the air pressure in the primary chamber being higher than the air pressure in the secondary chamber,

characterized in that the exhaust muffler further comprises:

the gas outlet pipe extends from the primary cavity and extends to the outside of the silencer cylinder body through the secondary cavity, and consists of a pressure swing pipeline and a drainage pipeline, wherein the inlet of the pressure swing pipeline is positioned in the primary cavity, the outlet of the pressure swing pipeline is connected to the inlet of the drainage pipeline, and the outlet of the drainage pipeline is positioned outside the silencer cylinder body and is communicated with the atmosphere;

one end of the capillary tube is communicated to the position, close to the inlet, of the drainage pipeline, the other end of the capillary tube is positioned at the bottom of the chamber where the inlet of the drainage pipeline is positioned or at the bottom of the chamber which is adjacent to the chamber where the inlet of the drainage pipeline is positioned and is positioned at the upstream of the chamber,

wherein the variable pressure conduit is arranged such that the difference in gas pressure between its outlet and inlet is greater than the difference in gas pressure between its outlet and the primary chamber.

Preferably, the outlet of the variable pressure conduit is located in the secondary chamber.

Preferably, the pressure swing conduit comprises a section of reducing pipe.

Preferably, the variable pressure pipeline comprises a section of expanding pipe or an elbow pipe for increasing the airflow stroke.

Preferably, the drainage pipeline is an equal-caliber straight pipe.

Preferably, the muffler cylinder is arranged such that the bottom of the chamber in which the capillary tube is provided is lower than the bottom of the other part of the muffler cylinder.

Preferably, the muffler cartridge further comprises a filler cavity located outside the secondary chamber.

Preferably, the inlet of the drain pipe is located in a first one of the secondary chambers, wherein the first secondary chamber is immediately adjacent to the primary chamber, and the other end of the capillary is located at the bottom of the primary chamber.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows:

the exhaust silencer for the automobile can ensure continuous discharge of the condensed water in the silencer without changing the barrel structure of the silencer, and avoids any adverse effect on the original performance of the exhaust silencer.

Drawings

Fig. 1 is a sectional view of an exhaust muffler for an automobile according to a preferred embodiment of the present invention.

Description of the reference numerals

100: exhaust muffler 1: silencer cylinder

11: primary chamber 12: secondary chamber

13: the filler chamber 14: partition plate with holes

2: pressure-changing pipeline 21: reducing pipe

3: water discharge pipes 31: connecting part

4: an air inlet pipe 5: capillary tube

6: condensed water

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, is intended to be illustrative, and not restrictive, and any other similar items may be considered within the scope of the present invention. In the following detailed description, directional terms, such as "left", "right", "upper", "lower", "front", "rear", and the like, are used with reference to the orientation as illustrated in the drawings.

As shown in fig. 1, an exhaust muffler 100 for an automobile according to a preferred embodiment of the present invention includes a muffler shell 1, the muffler shell 1 having a plurality of chambers partitioned by perforated partitions 14, the chambers including a primary chamber 11 and two secondary chambers 12 located adjacent to and outside the primary chamber 11, an intake pipe 4 of the automobile having one end connected to the inside of the primary chamber 11, and the pressure of air in the primary chamber 11 being higher than that in the secondary chambers 12. The arrangement of the above-described muffler cylinder 1 including the perforated partition 14 and the plurality of chambers makes the plurality of chambers in the muffler cylinder 1 as a whole form a pressure gradient distribution in which the pressure of the gas gradually decreases from the primary chamber 11 to the secondary chambers 12 on both sides, which helps to reduce and attenuate pulsation of the exhaust gas pressure, thereby reducing noise.

It should be understood that the number of secondary chambers 12 is not limited to two as in the embodiment shown in fig. 1, but may be varied as required for noise reduction, such as adding more secondary chambers 12 in series on either side of the primary chamber 11 and separated by perforated partition 14. It will also be appreciated that the gas flow in the outlet duct disposed within the muffler cartridge 1 is directed from the primary chamber 11 outwardly through the secondary chamber 12 to the atmosphere outside the muffler cartridge 1, so that the primary chamber 11 is upstream of the secondary chamber 12 with respect to this gas flow direction.

As shown in fig. 1, the exhaust muffler 100 according to the preferred embodiment of the present invention further includes an outlet pipe extending from the primary chamber 11 and extending to the outside of the muffler case 1 through the secondary chamber 12, and the outlet pipe may be divided into two parts, i.e., a variable pressure pipe 2 and a drain pipe 3. The inlet of the pressure changing pipeline 2 is positioned in the primary chamber 11, the outlet of the pressure changing pipeline is connected to the inlet of the drainage pipeline 3, and the outlet of the drainage pipeline 3 is positioned outside the silencer cylinder 1 and communicated with the atmosphere. It should be understood that the inlet of the water discharge pipeline 3 and the outlet of the pressure swing pipeline 2 are located at substantially the same position of the outlet pipe, and the position where they are connected to each other is referred to herein as a connection portion 31 of the water discharge pipeline 3. The connection 31 may be located in the secondary chamber 12 immediately adjacent the primary chamber 11. The pressure swing pipe 2 is arranged such that the difference between the gas pressure at the connection 31 and the inlet of the pressure swing pipe 2 is greater than the difference between the gas pressure at the connection 31 and the primary chamber 11, i.e., such that the pressure drop across the pressure swing pipe 2 is greater than the pressure drop across the chambers at the ends of the pressure swing pipe 2.

Furthermore, a capillary tube 5 is arranged in the chamber of the exhaust muffler 100. As shown in fig. 1, in some preferred embodiments, the upper end opening of the capillary 5 is communicated to the connection 31 adjacent to the drain pipe 3, i.e. the adjacent inlet of the drain pipe 3, the connection 31 is located in the secondary chamber 12, and the lower end opening of the capillary 5 is located at the bottom of the primary chamber 11.

It will be appreciated that the arrangement of the capillary tube 5 and the variable pressure conduit 2 as described above will be such that the gas pressure at the upper end opening of the capillary tube 5 is lower than the gas pressure at the lower end opening. Therefore, in most cases, the operation of the automobile engine causes the inside of the primary chamber 11 communicating with the inlet pipe 4 to have a significantly higher air pressure, and at this time, the condensed water 6 at the bottom of the muffler cylinder 1 can be sucked into the outlet pipe due to a significant air pressure difference between the upper and lower end openings of the capillary 5, and then discharged to the atmosphere through the outlet of the outlet pipe (i.e., the outlet of the drain pipe 3) due to the air pressure difference between the inlet and the outlet of the outlet pipe. Meanwhile, even if the air pressure in the primary chamber 11 is close to the air pressure in the secondary chamber 12 in some cases, the capillary tube 5 can still draw the condensed water 6 at the bottom of the muffler cylinder 1 into the outlet pipe at a relatively slow speed by using the capillary action, and as long as the air pressure in the primary chamber 11 is higher than the atmospheric pressure, the condensed water 6 drawn into the outlet pipe can still be discharged out of the atmosphere through the outlet of the outlet pipe.

In some preferred embodiments of the invention, the capillary tube 5 may be arranged slightly differently from the above-described embodiments, for example, the upper end opening of the capillary tube 5 communicates to the connection 31 adjacent to the drain pipe 3, i.e. to the adjacent inlet of the drain pipe 3, and the lower end opening of the capillary tube 5 is located at the bottom of the chamber where the connection 31 is located. In other words, the arrangement of the capillary 5 may be changed to the arrangement in which the upper and lower end openings are in the same chamber, as compared with the embodiment shown in fig. 1. This embodiment has the advantage of a simpler construction since the capillary tube 5 need not pass through the perforated partition 14, but the difference in gas pressure at the two end openings of the capillary tube 5 is relatively small compared to the above-described embodiment, and the rate of drawing the condensate 6 into the outlet duct is relatively slow.

According to some preferred embodiments of the invention, the variable pressure conduit 2 comprises a section of reducing pipe 21, the section of reducing pipe 21 acting to increase the gas pressure gradient locally in the conduit. According to some alternative embodiments, the variable pressure pipe 2 may also include a bent pipe such as a U-shaped pipe or an expanded diameter pipe for increasing the gas flow path, so that the pressure drop of the variable pressure pipe 2 at the head and tail ends is greater than the pressure drop of the chamber in which the head and tail ends of the variable pressure pipe 2 are located.

According to some preferred embodiments of the present invention, the drain pipe 3 is an equal-caliber straight pipe, and the muffler cylinder 1 is arranged such that the bottom of the chamber provided with the capillary tube 5 is lower than the bottom of the rest of the muffler cylinder 1. Therefore, the condensed water 6 accumulated in the muffler cylinder 1 can be concentrated in the chamber in which the capillary tube 5 is arranged, particularly in the chamber in which the lower end opening of the capillary tube 5 is provided, so that the condensed water 6 can be discharged out of the muffler cylinder 1 in time by using the capillary tube 5 as much as possible.

According to some preferred embodiments of the present invention, the muffler shell 1 further comprises a filler cavity 13 located outside the secondary chamber 12, in which a sound-absorbing material such as a glass fiber material may be filled, to further improve the noise reduction effect of the exhaust muffler 100.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. An exhaust muffler for an automobile, comprising:

characterized in that the exhaust muffler further comprises:

2. The exhaust muffler of claim 1, wherein the outlet of the variable pressure duct is located in the secondary chamber.

3. The exhaust muffler of claim 1, wherein the pressure swing pipe comprises a section of reducing pipe.

4. The exhaust muffler of claim 1, wherein the variable pressure conduit comprises an expanded diameter tube or an elbow for increased gas flow travel.

5. The exhaust muffler according to claim 3 or 4, wherein the drain pipe is an equal-caliber straight pipe.

6. The exhaust muffler according to claim 1, wherein the muffler cylinder is arranged such that a bottom of the chamber in which the capillary tube is provided is lower than a bottom of the other portion of the muffler cylinder.

7. The exhaust muffler of claim 1, wherein the muffler cartridge further comprises a filler cavity located outside the secondary chamber.

8. The exhaust muffler of claim 1, wherein the inlet of said drain pipe is located in a first of said secondary chambers, wherein said first secondary chamber is immediately adjacent to said primary chamber, and wherein said other end of said capillary tube is located at the bottom of said primary chamber.