Diesel engine silencer

Abstract

The utility model provides a diesel engine silencer, and belongs to the field of silencers. Comprising an outer shell and a two-end sealing structure, the inner shell is arranged on the inner side of the outer shell and is coaxial with the outer shell, the two ends of the inner shell are in sealed contact connection with the two ends of the outer shell respectively, an air inlet pipe and an air outlet pipe are installed on the two sides of the inner shell respectively, the air inlet pipe and the air outlet pipe extend out of the outer shell respectively, and a necking structure is further arranged on the air outlet pipe; the partition plate is vertically installed in the inner shell, and vent holes are formed in the inner walls, on the two sides of the partition plate, of the inner shell respectively; and the silencing cotton layer is arranged between the inner shell and the outer shell. According to the diesel engine silencer, through three-layer silencing treatment of the breathable sound insulation sleeve, the silencing cotton layer and the necking structure, tail gas can be effectively silenced, and the silencing efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of mufflers, in particular to a diesel engine muffler. Background Art

[0002] A diesel engine is a compression-ignition internal combustion engine that uses diesel as fuel. When a diesel engine is operating, the compressed, combusted, and ejected gas releases a large amount of energy. The primary source of noise is the high acoustic energy contained in the exhaust gas. This intense, piercing noise can have a physical and psychological impact on people working in this environment.

[0003] Prior art patent No. 202220148005.9 discloses a dry-type silencer for a diesel engine, comprising a shell component and an inner core component; the shell component comprises a cylinder and an outer sound-absorbing cylinder, an intake pipe and an exhaust pipe are respectively provided at both ends of the cylinder, the intake pipe and the exhaust pipe both extend to the inside of the outer sound-absorbing cylinder, a plurality of external through holes are provided on the outer sound-absorbing cylinder, and the interlayer between the cylinder and the outer sound-absorbing cylinder is filled with filler; the inner core component comprises a baffle, a plurality of inserts that are staggered and crossed with the intake pipe port are provided on one side of the baffle, a core tube and an inner sound-absorbing cylinder are provided on the other side of the baffle, a guide plate is provided at the end of the core tube away from the baffle, a plurality of internal through holes are provided on the inner sound-absorbing cylinder, and the interlayer between the core tube and the inner sound-absorbing cylinder is filled with filler.

[0004] In the above technology, after the airflow enters the sound-absorbing tube from the exhaust pipe, it is diverted by the guide plate and then hits the sound-absorbing space formed by the outer sound-absorbing tube and the inner sound-absorbing tube. However, although the airflow is diverted, due to the small diameter of the inner through hole, no inflow and outflow channels for the airflow are formed, thereby forming an airflow loop. Most of the airflow only hits the inner wall of the inner sound-absorbing tube, thus failing to achieve the expected sound absorption effect. Utility Model Content

[0005] In view of the above problems, the present invention provides a diesel engine muffler, which solves the problem in the prior art that the muffler cannot form a closed loop of airflow, thereby improving the sound absorption capacity of the muffler.

[0006] A diesel engine muffler comprises: an outer shell with sealing structures at both ends; an inner shell arranged inside the outer shell and coaxially designed with the outer shell, with both ends respectively connected to the two ends of the outer shell in sealed contact, an air inlet pipe and an air outlet pipe respectively installed on both sides of the inner shell, the air inlet pipe and the air outlet pipe respectively extending through the outer shell, and a necking structure also provided on the air outlet pipe; a partition plate vertically installed in the inner shell, with air vents respectively opened on the inner wall of the inner shell on both sides of the partition plate; a sound-absorbing cotton layer arranged between the inner shell and the outer shell.

[0007] In a preferred embodiment, the diameter of the inner shell is 2 / 5-3 / 5 of the diameter of the outer shell.

[0008] In a preferred embodiment, the diameter of the necking structure is 1 / 4-1 / 3 of the diameter of both sides of the necking structure.

[0009] In a preferred embodiment, the diesel engine muffler also includes: an inner tube, which is arranged on the inner side of the inner shell, one end of which is fixed on the partition plate, and the other end is open to the intake pipe, and there are evenly distributed holes around the inner tube; a breathable sound insulation sleeve is arranged on the outside of the inner tube.

[0010] In a preferred embodiment, the cross section of the equidividing hole is arranged in a rectangular structure.

[0011] In a preferred embodiment, the diesel engine muffler further includes: a separation pipe, which is arranged in the inner cylinder and fixed in the separation plate, has a conical structure toward one end of the intake pipe, and has four equal-dividing plates evenly arranged on the separation pipe.

[0012] In a preferred embodiment, the diesel engine muffler further comprises: flanges, which are arranged on the air inlet pipe and the air outlet pipe.

[0013] After the exhaust gas of the diesel engine muffler of this application enters the inner shell, it is evenly distributed and output by the equalizing holes. It then passes through the breathable sound insulation sleeve for the first silencer treatment, then enters the silencer cotton layer between the outer shell and the inner shell through the vent hole. After the silencer treatment, it flows out from the vent hole on the other side. Finally, it is further silenced by the necking structure of the exhaust pipe and discharged from the exhaust pipe. The diesel engine muffler of this device uses three layers of silencer treatment: breathable sound insulation sleeve, silencer cotton layer, and necking structure to effectively silence the exhaust gas and improve the silencer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Other characteristics, features and advantages of the present invention will become clear by reading the following description of exemplary embodiments with reference to the accompanying drawings. The accompanying drawings, which are incorporated into and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, similar reference numerals are used to represent similar elements. The drawings described below are some embodiments of the present invention, not all embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort.

[0015] Figure 1 A cross-sectional view of a diesel engine muffler according to the utility model;

[0016] Figure 2 Internal structure diagram of the diesel engine muffler of this utility model;

[0017] Figure 3 Enlarged view of position A of the diesel engine muffler of this utility model

[0018] In the figure: 10, outer shell; 20, inner shell; 21, air inlet pipe; 22, air outlet pipe; 23, necking structure; 30, partition plate; 31, vent hole; 32, sound-absorbing cotton layer; 40, inner tube; 41, equal-dividing hole; 42, breathable sound insulation sleeve; 43, partition pipe; 44, quartering plate; 50, flange. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be arbitrarily combined with each other.

[0020] The diesel engine muffler is described in detail below with reference to the accompanying drawings and embodiments. Example

[0021] A diesel engine muffler comprises: an outer shell 10 with a sealing structure at both ends; an inner shell 20, arranged on the inner side of the outer shell 10, coaxially designed with the outer shell 10, and with both ends sealed and connected to the two ends of the outer shell 10, an air inlet pipe 21 and an air outlet pipe 22 are respectively installed on both sides of the inner shell 20, the air inlet pipe 21 and the air outlet pipe 22 respectively extend out of the outer shell 10, and a necking structure 23 is also provided on the air outlet pipe 22; a partition plate 30, vertically installed in the inner shell 20, and air vents 31 are respectively opened on the inner wall of the inner shell 20 on both sides of the partition plate 30; a sound-absorbing cotton layer 32 is arranged between the inner shell 20 and the outer shell 10.

[0022] During operation, exhaust gas enters the inner housing 20 from the air inlet pipe 21, then enters the sound-absorbing cotton layer 32 between the outer housing 10 and the inner housing 20 through the vent 31. After being silenced, it flows out from the vent 31 on the other side. Finally, it is further silenced by the necking structure 23 of the outlet pipe 22 and discharged from the outlet pipe 22. This device can effectively silence the exhaust gas through the double-layer silencer treatment of the sound-absorbing cotton layer 32 and the necking structure 23, thereby improving the silencer efficiency.

[0023] Specifically, the necking structure 23 utilizes the sudden change of the pipe cross section to cause a change in impedance during sound propagation, thereby generating reflection and interference of sound energy, thereby reducing the sound energy radiated outward from the muffler to achieve the purpose of noise reduction.

[0024] The diameter of the inner shell 20 is 2 / 5-3 / 5 of the diameter of the outer shell 10 .

[0025] The diameter of the necking structure 23 is 1 / 4-1 / 3 of the diameter of both sides of the necking structure 23 .

[0026] The diesel engine muffler further includes: a flange 50 , which is arranged on the air inlet pipe 21 and the air outlet pipe 22 . Example

[0027] Example 2 is an improvement on Example 1, and the improvement includes: the diesel engine muffler also includes: an inner tube 40, which is arranged on the inner side of the inner shell 20, one end of which is fixed on the partition plate 30, and the other end is open toward the intake pipe 21, and there are evenly distributed holes 41 around the inner tube 40; a breathable sound insulation sleeve 42 is sleeved on the outer side of the inner tube 40.

[0028] During operation, the exhaust gas enters the inner shell 20 and is then distributed by the averaging holes 41 and evenly output. It then undergoes a first silencing treatment through the breathable sound-insulating sleeve 42, then enters the sound-absorbing cotton layer 32 between the outer shell 10 and the inner shell 20 through the vent holes 31. After being silencing treated, it flows out from the vent holes 31 on the other side. Finally, it is further silenced by the necking structure 23 of the outlet pipe 22 and discharged from the outlet pipe 22. The diesel engine muffler of this device uses a three-layer silencing treatment of the breathable sound-insulating sleeve 42, the sound-absorbing cotton layer 32, and the necking structure 23 to effectively silence the exhaust gas and improve the silencing efficiency.

[0029] The cross section of the equidividing hole 41 is arranged in a rectangular structure. Example

[0030] Example 3 is an improvement on Example 1, and the improvement includes: the diesel engine muffler also includes: a partition pipe 43, which is arranged in the inner tube 40 and fixed in the partition plate 30, has a conical structure toward one end of the intake pipe 21, and has four-dividing plates 44 evenly distributed on the partition pipe 43.

[0031] The airflow entering the inner tube 40 is first distributed by the quartering plate 44 and then evenly output through the equalizing holes 41 .

[0032] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include," "comprise," or any other variations thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such article or device. In the absence of further limitations, the elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the article or device comprising the elements.

[0033] The above embodiments are intended to illustrate the technical solutions of the present invention and are not intended to limit the present invention. The present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and replacements shall be covered by the claims of the present invention.

Claims

1. A diesel engine muffler, characterized in that: include: An outer shell (10) with sealing structures at both ends; An inner shell (20) is arranged inside the outer shell (10) and is coaxially designed with the outer shell (10). Two ends of the inner shell (20) are respectively connected to the two ends of the outer shell (10) in a sealed contact manner. An air inlet pipe (21) and an air outlet pipe (22) are respectively installed on both sides of the inner shell (20). The air inlet pipe (21) and the air outlet pipe (22) respectively extend through the outer shell (10). A necking structure (23) is also provided on the air outlet pipe (22); A partition plate (30) is vertically mounted in the inner shell (20), and vent holes (31) are respectively provided on the inner wall of the inner shell (20) on both sides of the partition plate (30); A sound-absorbing cotton layer (32) is provided between the inner shell (20) and the outer shell (10).

2. The diesel engine muffler according to claim 1, characterized in that: The diameter of the inner shell (20) is 2 / 5-3 / 5 of the diameter of the outer shell (10).

3. The diesel engine muffler according to claim 1, characterized in that: The diameter of the necking structure (23) is 1 / 4-1 / 3 of the diameters of both sides of the necking structure (23).

4. The diesel engine muffler according to claim 1, characterized in that: The diesel engine muffler also includes: The inner cylinder (40) is arranged inside the inner shell (20), one end of which is fixed on the partition plate (30) and the other end of which is open toward the air inlet pipe (21). The inner cylinder (40) is provided with evenly distributed holes (41) on its circumference, and a breathable and sound-insulating sleeve (42) is provided on the outside of the inner cylinder (40).

5. The diesel engine muffler according to claim 4, characterized in that: The cross section of the averaging hole (41) is arranged in a rectangular structure.

6. The diesel engine muffler according to claim 4, characterized in that: The diesel engine muffler also includes: The separation tube (43) is arranged in the inner cylinder (40) and fixed in the separation plate (30), and has a conical structure at one end facing the air inlet pipe (21), and a quartering plate (44) is evenly arranged on the separation tube (43).

7. The diesel engine muffler according to claim 1, characterized in that: The diesel engine muffler also includes: The flange (50) is provided on the air inlet pipe (21) and the air outlet pipe (22).

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