Post-treatment silencing device
By designing a porous structured sound silencer, a silencer and a silencer tube in the post-processing device, the efficient silence effect under extremely low space occupation is achieved, and the problems of large space occupation and high cost of silencer in the prior art are solved, and the Tight integration with National VI postprocessor.
Patent Information
- Application Number
- CN202323636847.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-12-28
AI Technical Summary
When the existing VI/European VI diesel engine post-treatment devices often need to add additional auxiliary silencers when implementing the silence function, resulting in large space occupancy and high cost.
Design a post-processing silencer device, including a housing, silencer panel, silencer cotton and silencer tube. The silencer tube is arranged in the through holes of the silencer panel and silencer cotton, and a porous structure is arranged on the silencer panel and silencer cotton to realize the composite multiple silencer Function, good sound silencing effect, and directly inherited on the original post-processing package, taking up less space.
It achieves efficient sound silence effect under extremely low space occupation, is closely integrated with the National VI post-processor, reducing space occupation and cost, and improving sound silence effect.
Smart Images
Figure CN222208057U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of engine post-processing, in particular to a post-processing silencing device. Background Art
[0002] In the prior art, the post-treatment device of National VI / Euro VI diesel engine generally adopts CH injection
[0003] +DOC+DPF+SCR technical route. CH injection is the fuel injection for DPF regeneration after the turbine of the diesel engine. The DOC, DPF and SCR processing units can be connected separately or integrated together. At the same time, the sensors and other components of each functional unit are integrated and installed in the form of an assembly. The integrated type is convenient for installation and matching, and is also conducive to increasing the temperature of each catalytic unit, improving the conversion efficiency of each functional unit, and effectively reducing the emission of exhaust pollutants.
[0004] In addition to meeting emission targets, post-processing packaging products also need to meet the muffler function. The inventors found that the conventional National VI post-processor needs to add an additional auxiliary muffler at the back end, which takes up a lot of space and is costly. Utility Model Content
[0005] The purpose of the utility model is to provide a post-processing silencing device, which can achieve better silencing effect with extremely low space occupancy, is closely integrated with the National VI post-processing, and solves the problems in the prior art.
[0006] In order to solve the above technical problems, the utility model is realized by the following technical solutions:
[0007] The utility model discloses a post-processing silencer, comprising a shell and a silencer pipe, wherein a silencer plate, silencer cotton and a rear end cover are sequentially arranged in the shell, and the rear end cover is connected to the shell; through holes are arranged in the centers of the silencer plate, silencer cotton and the rear end cover, one end of the silencer pipe is arranged in the through hole, and the other end of the silencer pipe is exposed, and a porous structure is arranged at the position where the end of the silencer pipe overlaps with the silencer cotton.
[0008] Optionally, the porous structure of the muffler pipe includes a plurality of holes uniformly arranged along the circumference and axial direction of the muffler pipe.
[0009] Optionally, the silencer plate includes an upper end face, the through hole is arranged at the center of the upper end face, an inner edge is extended outwardly around the through hole of the upper end face, an outer edge is extended outwardly around the outer edge of the upper end face, the outer edge covers the outer side of the silencer cotton, and the inner edge extends into the through hole of the silencer cotton.
[0010] Optionally, a porous structure is provided on the upper end surface, and the porous structure of the upper end surface includes a plurality of holes evenly distributed along the upper end surface.
[0011] Optionally, an arc-shaped curved pipe portion is provided at the exposed end of the silencer pipe.
[0012] Optionally, the rear end cover includes an arc-shaped main body, the shape of the arc-shaped main body is gradually reduced in the direction away from the sound-absorbing cotton, one end of the arc-shaped main body is provided with a threaded portion, and the other end of the arc-shaped main body is provided with an extension portion.
[0013] Optionally, the rear end cover is threadedly connected to the shell via a threaded portion, and a protruding portion is provided at an edge of the threaded portion.
[0014] Optionally, the extension portion is adapted to the shape of the silencer pipe.
[0015] Optionally, the through hole is adapted to the shape of the silencer pipe.
[0016] Optionally, the cross-sectional shapes of the shell, the silencer plate and the silencer cotton are all circular.
[0017] The utility model has the following beneficial effects:
[0018] 1. The utility model provides a post-processing silencer, in which a silencer plate and silencer cotton are arranged inside a shell, a silencer pipe is arranged in the through holes of the silencer plate and the silencer cotton, a porous structure is arranged at the position where the end of the silencer pipe overlaps with the silencer cotton, and a porous structure is arranged on the silencer plate. A composite multiple silencer function is realized by the silencer cotton, the silencer plate and the silencer pipe, and the silencer effect is good.
[0019] 2. The noise reduction structure of the utility model is directly inherited from the original post-processing package, and occupies less space.
[0020] 3. The cross-sectional shapes of the shell, the silencer plate and the silencer cotton of the utility model are all circular, and the whole adopts a barrel shape, realizing an integrated silencer design.
[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0023] Figure 1 It is an exploded schematic diagram of the overall structure of the utility model;
[0024] Figure 2This is a schematic diagram of the overall structure assembly of the utility model;
[0025] Figure 3 This is a schematic diagram of the disassembled anatomical structure of the utility model;
[0026] Figure 4 This is a schematic diagram of the structure of the SCR system of the utility model;
[0027] Figure 5 This is a working principle diagram of the SCR system of the utility model.
[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0029] 1 shell, 2 silencer pipe, 3 silencer cotton, 4 silencer plate, 5 rear end cover, 6 through hole, 7 hole, 8 upper end surface, 9 inner edge, 10 outer edge, 11 arc-shaped curved pipe part, 12 arc-shaped main body, 13 threaded part, 14 extension part, 15 protruding part. DETAILED DESCRIPTION
[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] Terminology explanation:
[0032] SCR (Selective Catalytic Reduction) technology: Selective catalytic reduction, a technology that uses ammonia and NOx to undergo a catalytic reduction reaction to eliminate nitrogen oxides in diesel engine exhaust.
[0033] SCR system: The SCR system is a system that uses SCR technology to coat the catalyst on a carrier and encapsulate it.
[0034] Sensor: used to collect relevant signals for post-processing, mainly including temperature sensor, nitrogen and oxygen sensor, differential pressure sensor, etc.
[0035] SCR technology is one of the main post-treatment technologies for eliminating nitrogen oxides in diesel engine exhaust. According to the function, it is mainly divided into three parts: control unit, urea dosing unit and catalytic reaction unit; among them, urea dosing unit can be divided into air-assisted injection system and non-air-assisted injection system according to whether there is air-assisted injection.
[0036] like Figure 4As shown, the control unit of the SCR system is integrated with the control unit (ECU) of the engine, and is mainly used to execute the SCR control strategy, and control the urea dosage unit according to the ambient temperature, exhaust temperature, urea liquid level, urea temperature, and urea pressure sensor signal, and spray the urea solution into the exhaust gas flow in a timely and quantitative manner according to demand; the urea dosage unit mainly includes a urea tank, a urea supply unit, a urea injection unit, a heating component, and connecting pipes and lines to ensure sufficient atomization and decomposition of the urea solution; the catalytic reaction unit mainly includes an SCR catalyst, a carrier and its packaging, and is used to reduce the main harmful components of nitrogen oxides in diesel engine exhaust into nitrogen and water.
[0037] like Figure 5 As shown in the figure, the basic working principle of the SCR system is: the exhaust gas flows out of the turbocharger turbine and enters the exhaust pipe. At the same time, the urea injection unit installed on the exhaust pipe sprays a fixed amount of urea aqueous solution into the exhaust pipe in the form of mist. The urea droplets undergo hydrolysis and thermal decomposition under the action of high-temperature exhaust gas to generate the required reducing agent ammonia (NH3). Ammonia (NH3) selectively reduces nitrogen oxides (NOx) to nitrogen (N2) under the action of the catalyst. Sometimes, in order to prevent excessive ammonia (NH3) from escaping and causing secondary pollution, a catalyst that promotes the oxidation of ammonia (NH3) to nitrogen (N2) needs to be set behind the SCR catalyst.
[0038] The molecular formula of urea is NH2CONH2. After adding H2O, it decomposes into NH3 and CO2 at high temperature. This reaction can be completed without catalytic conditions:
[0039] NH2CONH2+H2O→2NH3+CO2
[0040] NH3 in the SCR catalyst reacts with NO and NO2 in the exhaust to produce N2 and H2O:
[0041] 2NO+2NO2+4NH3→4N2+6H2O
[0042] 4NO+O2+4NH3→4N2+6H2O
[0043] 2NO2+O2+4NH3→3N2+6H2O
[0044] In order to prevent ammonia leakage during the entire service life of the engine, it is sometimes necessary to install an ammonia elimination catalyst after the SCR catalyst, in which NH3 reacts with O2 to produce N2 and H2O:
[0045] 4NH3+3O2→2N2+6H2O
[0046] Embodiment 1:
[0047] See also Figure 1-3 As shown, the utility model is a post-processing silencer, comprising a shell 1 and a silencer pipe 2, wherein a silencer plate 2, silencer cotton 3 and a rear end cover 5 are sequentially arranged in the shell 1 from front to back, silencer cotton 3 is arranged in the shell 1, a silencer plate 4 is arranged at one end of the silencer cotton 3, a rear end cover 5 is arranged at the other end of the silencer cotton 3, and the rear end cover 5 is connected to the shell 1; a through hole 6 is arranged in the center of the silencer plate 4, the silencer cotton 3 and the rear end cover 5, one end of the silencer pipe 2 is arranged in the through hole 6, the other end of the silencer pipe 2 is exposed, and a porous structure is arranged at the position where the end of the silencer pipe 2 overlaps with the silencer cotton 3.
[0048] The porous structure of the silencer pipe 2 includes a plurality of holes 7 evenly arranged along the circumference and axial direction of the silencer pipe 2 , which can make the sound be absorbed by the silencer cotton 3 more evenly.
[0049] A porous structure is provided at the end position where the silencer pipe 2 and the silencer cotton 3 overlap, so that when the gas passes through the silencer pipe 2, the gas can be dissipated through the porous structure, and the silencer cotton 3 can fully absorb the noise. Compared with not providing a porous structure, this embodiment can achieve better and more efficient noise reduction.
[0050] like Figure 1 As shown, in this embodiment, the muffler plate 4 and the muffler cotton 3 are enclosed and arranged inside the housing 1, and the end of the housing 1 is encapsulated by the rear end cover 5. One end of the muffler pipe 2 passes through the muffler plate 4, the muffler cotton 3 and the through hole 6 in the center of the rear end cover 5 and is arranged inside the housing 1, and the other end is arranged outside the housing 1. The muffler pipe 2 is in the shape of a straight pipe as a whole, and an arc-shaped curved pipe part 11 is arranged at the end of the exposed end thereof, and the arc-shaped curved pipe part 11 is conducive to the discharge of exhaust gas.
[0051] In order to make full use of the silencing effect of the silencing cotton 3, the silencing plate 4 of this embodiment is arranged on the side of the housing 1 away from the rear end cover 5. Figure 1 , Figure 3 As shown, the muffler plate 4 includes an upper end surface 8, the through hole 6 is arranged at the central position of the upper end surface 8, the upper end surface 8 through hole 6 is provided with an inner edge 9 extending outwardly from the circumference thereof, the upper end surface 8 is provided with an outer edge 10 extending outwardly from the outer circumference thereof, the outer edge 10 covers the outer circumference of the muffler cotton 3, and the inner edge 9 extends into the through hole 6 of the muffler cotton 3. A porous structure is arranged on the upper end surface 8, and the porous structure of the upper end surface includes a plurality of holes 7 evenly distributed along the upper end surface.
[0052] By also providing the sound-absorbing plate 4 with a porous structure, the sound-absorbing effect of the sound-absorbing cotton 3 can be further utilized.
[0053] Therefore, in this embodiment, both the silencer plate 4 and the silencer tube 2 adopt a porous design, and a flexible silencer cotton 3 medium is wrapped between the silencer plate 4, the silencer tube 2, and the shell 1, which can achieve a composite and multiple silencer effect and realize efficient use of the silencer cotton 3.
[0054] Taking production costs into consideration, the post-processing silencer of this embodiment is configured as a barrel as a whole, and the cross-sectional shapes of the shell 1, silencer plate 4 and silencer cotton 3 are all circular.
[0055] like Figure 3 As shown, the rear end cover 5 includes an arc-shaped main body 12, the shape of the arc-shaped main body 12 is gradually reduced in the direction away from the silencer cotton 3, and the whole is trumpet-shaped. A threaded portion 13 is provided at one end of the arc-shaped main body 12, and an extension portion 14 is provided at the other end of the arc-shaped main body 12.
[0056] The rear end cover 5 is threadedly connected to the shell body 1 via a threaded portion 13, and a protruding portion 15 is provided at the edge of the threaded portion 13 to facilitate disassembly and installation of the rear end cover 5; the extending portion 14 is adapted to the shape of the muffler 2, and when in use, the extending portion 14 surrounds the outer peripheral side of the muffler 2.
[0057] Working principle:
[0058] When the utility model is installed, the shell 1 is connected to the post-processing package, specifically to the pipe behind the SCR catalyst of the SCR system, and the noise is silenced by utilizing the porous structure of the silencer plate 4, the porous structure of the silencer pipe 2 and the silencer cotton 3. The silenced gas is discharged through the arc-shaped curved pipe part 11.
[0059] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims
1. A post-processing silencing device, characterized in that: It includes a shell and a silencer pipe, wherein a silencer plate, silencer cotton and a rear end cover are sequentially arranged in the shell, and the rear end cover is connected to the shell; the silencer plate, silencer cotton and the rear end cover are all centrally provided with through holes, one end of the silencer pipe is arranged in the through hole, and the other end of the silencer pipe is exposed, and a porous structure is arranged at the position where the end of the silencer pipe overlaps with the silencer cotton.
2. The post-processing silencing device according to claim 1, characterized in that: The porous structure of the muffler pipe comprises a plurality of holes uniformly arranged along the circumference and axial direction of the muffler pipe.
3. The post-processing silencing device according to claim 1, characterized in that: The silencer plate includes an upper end surface, the through hole is arranged at the central position of the upper end surface, an inner edge is extended outwardly from the peripheral side of the through hole of the upper end surface, an outer edge is extended outwardly from the outer peripheral side of the upper end surface, the outer edge covers the outer peripheral side of the silencer cotton, and the inner edge extends into the through hole of the silencer cotton.
4. The post-processing silencing device according to claim 3, characterized in that: The upper end surface is provided with a porous structure, and the porous structure of the upper end surface includes a plurality of holes evenly distributed along the upper end surface.
5. The post-processing silencing device according to claim 1, characterized in that: The end of the muffler pipe exposed at one end is provided with an arc-shaped curved pipe part.
6. The post-processing silencing device according to claim 1, characterized in that: The rear end cover comprises an arc-shaped main body, the shape of the arc-shaped main body is gradually reduced in the direction away from the sound-absorbing cotton, one end of the arc-shaped main body is provided with a threaded part, and the other end of the arc-shaped main body is provided with an extension part.
7. The post-processing silencing device according to claim 6, characterized in that: The rear end cover is threadedly connected to the housing through a threaded portion, and a protruding portion is arranged at an edge of the threaded portion.
8. The post-processing silencing device according to claim 6, characterized in that: The extension portion is adapted to the shape of the silencer pipe.
9. The post-processing silencing device according to claim 1, characterized in that: The through hole is adapted to the shape of the muffler pipe.
10. The post-processing silencing device according to claim 1, characterized in that: The cross-sectional shapes of the shell, the sound-absorbing plate and the sound-absorbing cotton are all circular.