Gas machine postprocessor
By designing the gas machine postprocessor for the main and secondary abscessed part, adopting a double-layer structure and a porous medium structure, combined with the TWC catalytic unit, the problem of high-speed airflow noise of natural gas engines is solved, noise reduction and reliability improvement are achieved, and regulatory requirements are met.
Patent Information
- Application Number
- CN202422942249.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-11-30
AI Technical Summary
The existing conventional after-processors suitable for National VI diesel engines are difficult to solve the high-speed airflow noise of natural gas engines, and the sound-silencing structural unit that can be used to optimize noise is limited in space and cannot meet user experience and regulatory requirements.
A gas machine post-processor is designed, including the main and secondary abscessed parts, adopting a double-layer structure, an expansion structure and a resonant cavity structure, combined with a porous medium structure, using a TWC1+TWC2 catalytic unit, and connected through a connecting tube, an outer layer of heat insulation cover and thermal insulation cotton are added to reduce medium and low frequency and medium and high frequency noise.
It effectively reduces the noise of the gas machine post-processor, improves reliability and functionality, extends product life, meets noise regulations and ensures safety in high-temperature working conditions.
Smart Images
Figure CN223293797U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of noise reduction and emission of post-processors of commercial vehicle gas engines, and in particular relates to a post-processing structure and system suitable for natural gas engines. Background Art
[0002] As the application of gas engines in commercial vehicles meeting China VI emission standards becomes a focus of industry attention, the market share of natural gas heavy-duty trucks is expected to continue to grow. In the past two years, gas engines have already captured half of the heavy-duty truck and tractor market, becoming the backbone of energy conservation, emission reduction, and green manufacturing within the industry. Currently, due to the inherently higher exhaust flow and temperature of natural gas engines in commercial vehicles compared to diesel engines, significant airflow noise is generated in the after-processors of natural gas engines. Conventional after-processor structures cannot address this airflow noise, resulting in a poor user experience and failure to meet national noise regulations.
[0003] Conventional after-processors for China VI diesel engines struggle to address the high-speed airflow noise of natural gas engines. Furthermore, the space available for commercial vehicle after-processors is largely occupied by the catalyst structure, leaving limited room for adjustment for noise reduction muffler components. This necessitates a new approach: designing an after-processor that meets these requirements without increasing or even reducing the cost of existing solutions. Summary of the Invention
[0004] In order to solve the problem that conventional after-processors suitable for National VI diesel engines in the prior art are difficult to solve the high-speed airflow noise of natural gas engines and the space of the silencer structure unit that can be used to optimize the noise is limited, the utility model proposes a gas engine after-processor suitable for natural gas engines that can reduce the engine airflow exhaust noise based on a commercial vehicle after-processor in a limited space.
[0005] The technical solution of the utility model is as follows:
[0006] The above-mentioned gas engine after-processor includes a main muffler part and an auxiliary muffler part, and the main muffler part and the auxiliary muffler part are connected together by a connecting pipe; the main muffler part includes a main muffler shell encapsulating a catalytic unit and a main muffler front end cover and a main muffler rear end cover respectively installed at both ends of the main muffler shell; the main muffler shell is respectively provided with an air inlet and an air outlet near the front port and the rear port; the air inlet is installed with an air intake pipe; the auxiliary muffler part includes an auxiliary muffler shell, an auxiliary muffler front end cover, an auxiliary muffler rear end cover, an auxiliary muffler muffler pipe , auxiliary silencer cotton; the two ends of the auxiliary silencer shell are respectively welded with the auxiliary silencer front end cover and the auxiliary silencer rear end cover to form a sealed chamber; the auxiliary silencer pipe is arranged in the auxiliary silencer shell, and the two ends respectively pass through the auxiliary silencer front end cover and the auxiliary silencer rear end cover and are welded with the auxiliary silencer front end cover and the auxiliary silencer rear end cover; the auxiliary silencer cotton fills the space area between the auxiliary silencer shell and the auxiliary silencer pipe; the inlet end of the connecting pipe is sealed and connected to the air outlet of the main silencer shell, and the outlet end is sealed and connected to the auxiliary silencer pipe.
[0007] The gas engine after-processor, wherein: the main exhaust shell is a double-layer structure, including a main exhaust outer shell and a main exhaust inner shell; a layer of heat insulation cotton is provided between the main exhaust outer shell and the main exhaust inner shell.
[0008] The gas engine after-processor, wherein: the main exhaust front end cover is composed of the main exhaust front outer end cover, the main exhaust front inner end cover and the main exhaust front end cover insulation cotton arranged between the main exhaust front outer end cover and the main exhaust front inner end cover; the main exhaust rear end cover is composed of the main exhaust rear outer end cover, the main exhaust rear inner end cover and the main exhaust rear end cover insulation cotton arranged between the main exhaust rear outer end cover and the main exhaust rear inner end cover.
[0009] The gas engine after-processor, wherein: the main muffler part includes a front baffle and a rear baffle vertically fixed to the front and rear ends of the main muffler shell; the front and rear ends of the catalytic unit are supported by the front baffle and the rear baffle respectively.
[0010] The gas engine after-processor, wherein: the catalytic unit includes a catalyst housing, a first TWC carrier and a second TWC carrier; the catalyst housing is installed on the inner side of the main burner inner housing, and the first TWC carrier and the second TWC carrier are installed in sequence from back to front inside the catalyst housing; a first TWC liner is sandwiched between the outer wall of the first TWC carrier and the inner wall of the catalyst housing; a second TWC liner is sandwiched between the outer wall of the second TWC carrier and the inner wall of the catalyst housing; a mesh plate welded to the catalyst housing is provided at the front of the TWC carrier, and a retaining ring is provided at the rear end.
[0011] The gas engine after-processor, wherein: the inlet end of the connecting pipe is inserted into the connection between the main muffler rear inner end cover and the main muffler inner shell through the gas outlet of the main muffler shell and welded together, and the outlet end is inserted into the inlet end of the auxiliary muffler muffler pipe and welded, so that the main muffler part and the auxiliary muffler part are connected into a whole.
[0012] The gas engine after-processor, wherein: the outer wall of the main exhaust rear outer end cover is provided with a pair of wiring harness brackets and an oxygen sensor seat for fixing the oxygen sensor; the wiring harness bracket is used to fix the oxygen sensor wiring harness and the temperature sensor wiring harness.
[0013] The gas engine after-processor, wherein: an oxygen sensor seat for installing an oxygen sensor is welded on the tail pipe of the auxiliary muffler pipe.
[0014] The gas engine after-processor, wherein: the processor is welded with a main and auxiliary exhaust connection bracket between the main exhaust shell and the auxiliary exhaust shell.
[0015] The gas engine after-processor, wherein: the processor is also provided with a heat insulation board mounting bracket and a vehicle mounting bracket; the heat insulation board mounting bracket is a pair, which are respectively welded on the front outer end cover and the rear outer end cover of the main burner; the vehicle mounting bracket is welded on the main burner outer shell and connected to the square tube bracket of the vehicle. Beneficial effects
[0016] The gas engine post-processor of the utility model has a simple and reasonable structural design and reliable performance. It can effectively improve the reliability and functionality of the post-processor, thereby improving the conversion efficiency of the post-processor. The service life of the product is significantly improved compared with traditional post-processors, and the unsafe factors in the gas engine post-processor are completely solved.
[0017] The main and auxiliary muffler sections of this new post-processor are connected by a connecting pipe. The main muffler utilizes an expansion-resonance cavity structure, while the auxiliary muffler features a porous medium structure, reducing mid-low-frequency and mid-high-frequency noise, respectively. The housing incorporates an outer heat shield and outer insulation cotton, while the catalytic unit utilizes a TWC1+TWC2 solution. The coating on the TWC carrier of the catalytic unit is heat-resistant up to 900°C, ensuring that the surface temperature of the post-processor does not exceed 200°C even when operating at high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is the front view of the gas engine post-processor of the utility model;
[0019] Figure 2 The utility model is a gas engine post-processor Figure 1 Center rotated sectional view;
[0020] Figure 3 This is the front view of the catalyst assembly of the gas engine after-processor of the present utility model. DETAILED DESCRIPTION
[0021] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.
[0022] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.
[0023] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "inside", "outside", "up", "down", "front", and "back" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the embodiments of the present application.
[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.
[0025] like Figures 1 to 3 As shown, the gas engine post-processor of the present invention includes a main silencer part 1 and an auxiliary silencer part 2, and the main silencer part 1 and the auxiliary silencer part 2 are connected together through a connecting pipe 3.
[0026] The main muffler part 1 of the after-processor includes a main muffler shell 11, a main muffler front cover 12, a main muffler rear cover 13, a partition 14, a catalytic unit 15, and an air intake pipe 16.
[0027] The main muffler housing 11 is used to encapsulate the catalytic unit 15. It has an internal accommodating space and its front and rear ends are open, with an air inlet and an air outlet respectively provided at the front and rear ends. The main muffler front cover 12 is matched and fixed vertically to the front end of the main muffler housing 11; the main muffler rear cover 13 is matched and fixed vertically to the rear end of the main muffler housing 11. The main muffler part of the box body is provided with heat insulation cotton and an outer heat insulation cover.
[0028] Preferably, the main combustion shell 11 adopts a double-layer structure, specifically as follows Figure 2 As shown, it includes a main exhaust outer shell 111 and a main exhaust inner shell 112, and a layer of heat insulation cotton 113 is provided between the main exhaust outer shell 111 and the main exhaust inner shell 112. Further, the main exhaust shell 11 is provided with an outer heat insulation cover and an outer heat insulation cotton (not shown).
[0029] The main exhaust front end cover 12 is composed of a main exhaust front outer end cover 121, a main exhaust front inner end cover 122, and a main exhaust front end cover insulation cotton 123; the main exhaust front outer end cover 121 is vertically fixed to the front port of the main exhaust shell 11, and the main exhaust front inner end cover 122 is vertically fixed to the inner side of the front port of the main exhaust shell 11 and is located on the inner side of the main exhaust front outer end cover 121; the main exhaust front end cover insulation cotton 123 is filled between the main exhaust front outer end cover 121 and the main exhaust front inner end cover 122.
[0030] The main exhaust rear end cover 13 is composed of a main exhaust rear outer end cover 131, a main exhaust rear inner end cover 132, and a main exhaust rear end cover insulation cotton 133; the main exhaust rear outer end cover 131 is vertically fixed to the rear port of the main exhaust shell 11, and the main exhaust rear inner end cover 132 is vertically fixed to the inner side of the rear port of the main exhaust shell 11 and is located on the inner side of the main exhaust rear outer end cover 131; the main exhaust rear end cover insulation cotton 133 is filled between the main exhaust rear outer end cover 131 and the main exhaust rear inner end cover 132; the outer wall of the main exhaust rear outer end cover 131 is also matched with a pair of wiring harness brackets 134 and an oxygen sensor fixing bracket 135 for fixing the oxygen sensor; the wiring harness bracket 134 is used to fix the oxygen sensor wiring harness and the temperature sensor wiring harness.
[0031] By means of the heat insulation cotton 113 arranged between the main exhaust outer shell 111 and the main exhaust inner shell 112, the main exhaust front end cover heat insulation cotton 123 between the main exhaust front outer end cover 121 and the main exhaust front inner end cover 122, and the main exhaust rear end cover heat insulation cotton 133 between the main exhaust rear outer end cover 131 and the main exhaust rear inner end cover 132, heat preservation and heat insulation are performed to ensure the internal temperature of the main exhaust shell 11, so that the catalytic unit 15 can fully react with HC and CO in the exhaust gas, ensure that the external radiation temperature is less than 200°C, reduce the surface temperature of the outer shell, and prevent the components around the after-processor from being burned.
[0032] The partition 14 is matched and vertically fixed to the inside of the main combustion shell 11, and includes a front partition 141 matched and vertically fixed to the inside of the front end of the main combustion shell 11 and a rear partition 142 matched and vertically fixed to the inside of the rear end of the main combustion shell 11; the front partition 141 and the rear partition 142 are welded to the main combustion inner shell 112 to support the catalytic unit 15, and at the same time a resonance cavity structure is formed between the front partition 141 and the rear partition 142 to eliminate medium and low frequency noise.
[0033] The catalytic unit 15 is mainly used to remove HC and CO in the exhaust gas, reacting with CO and HC in the exhaust gas to generate CO2 and H2O; the catalytic unit 15 is matched and installed in the main exhaust shell 11, and the front and rear ends are supported by the main exhaust front baffle 141 and the main exhaust rear baffle 142 respectively; wherein, the catalytic unit 15 includes a catalyst shell 152, a TWC carrier 154 and a TWC carrier 156; the catalyst shell 152 is matched and installed on the inner side of the main exhaust inner shell 112, and the TWC carrier 154 and the TWC carrier 156 are matched and installed in its interior from back to front; a first TWC gasket 153 is sandwiched between the outer wall of the TWC carrier 154 and the inner wall of the catalyst shell 152; a second TWC gasket 155 is sandwiched between the outer wall of the TWC carrier 156 and the inner wall of the catalyst shell 152. There is a mesh plate 151 in front of the TWC substrate 154, which is welded to the catalyst shell, mainly to improve the uniformity of the gas. There is a retaining ring 157 at the rear end of the TWC substrate 156, whose main function is to prevent the substrate from moving.
[0034] The air intake pipe 16 is installed at the contact position 12 between the main exhaust front inner end cover 122 and the main exhaust inner shell 1 through the air intake of the main exhaust shell 11. One end is welded to the main exhaust inner shell 112 and the main exhaust front inner end cover 122 respectively, and the other end extends to the outside of the main exhaust shell 11.
[0035] The auxiliary muffler part 2 includes an auxiliary muffler shell 21, an auxiliary muffler front cover 22, an auxiliary muffler rear cover 23, an auxiliary muffler muffler pipe 24, and an auxiliary muffler muffler cotton 25;
[0036] The two ends of the auxiliary exhaust shell 21 are welded together with the auxiliary exhaust front cover 22 and the auxiliary exhaust rear cover 23 to form a sealed chamber;
[0037] The auxiliary muffler pipe 24 is arranged in the auxiliary muffler shell 21, and its two ends pass through the auxiliary muffler front cover 22 and the auxiliary muffler rear cover 23 respectively and are welded together with the auxiliary muffler front cover 22 and the auxiliary muffler rear cover 23;
[0038] The auxiliary muffler cotton 25 fills the space between the auxiliary muffler shell 21 and the auxiliary muffler tube 24, completely filling it up to eliminate medium and high frequency noise;
[0039] An oxygen sensor seat 26 is welded to the tail pipe of the auxiliary muffler pipe 24 , and the oxygen sensor is mounted on the oxygen sensor seat 26 .
[0040] The connecting pipe 3 is used to connect the main muffler part 1 and the auxiliary muffler part 2. The inlet end is inserted into the connection between the main muffler rear inner end cover 132 and the main muffler inner shell 112 through the air outlet of the main muffler shell 11 and welded together. The outlet end is inserted into the inlet end of the auxiliary muffler pipe 24 and welded, so that the main muffler part 1 and the auxiliary muffler part 2 are connected into a whole.
[0041] Furthermore, the processor is welded with a main and auxiliary exhaust connection bracket 4 between the main exhaust housing 11 and the auxiliary exhaust housing 21. In this embodiment, four main and auxiliary exhaust connection brackets 4 are provided to ensure the overall strength of the processor.
[0042] The processor is also provided with a heat shield mounting bracket 5, a vehicle mounting bracket 6, a sensor harness bracket 7, and an oxygen sensor fixing bracket 8;
[0043] There is a pair of heat insulation board mounting brackets 5, which are respectively welded on the main exhaust front outer end cover 121 and the main exhaust rear outer end cover 131; the vehicle mounting bracket 6 is welded on the main exhaust outer shell 111 and connected to the square tube bracket of the vehicle; the oxygen sensor wiring harness bracket 7 and the oxygen sensor fixing bracket 8 are welded on the main exhaust front outer end cover 121, which are used to fix the oxygen sensor and wiring harness.
[0044] The gas engine afterprocessor of this utility model has a main and auxiliary muffler connected by a connecting pipe. The main muffler adopts an expansion structure + resonance cavity structure, and the auxiliary muffler has a porous medium structure, respectively reducing low- and medium-frequency noise. The shell has an outer heat shield and outer insulation cotton. The catalytic unit adopts a TWC1 + TWC2 solution. The coating on the TWC carrier of the catalytic unit is heat-resistant up to 900°C, ensuring that the surface temperature of the afterprocessor does not exceed 200°C when operating at high temperatures. This utility model completely eliminates the unsafe factors in gas engine afterprocessors, improves the reliability and functionality of the afterprocessor, and enhances the conversion efficiency of the afterprocessor. Compared with traditional afterprocessors, the product lifespan is significantly improved.
Claims
1. A gas engine post-processor, characterized in that: The processor includes a main muffler part and an auxiliary muffler part, and the main muffler part and the auxiliary muffler part are connected together through a connecting pipe; The main muffler part includes a main muffler shell encapsulating a catalytic unit and a main muffler front cover and a main muffler rear cover respectively installed at both ends of the main muffler shell; the main muffler shell is respectively provided with an air inlet and an air outlet near the front port and the rear port; the air inlet is installed with an air intake pipe; The auxiliary muffler part includes an auxiliary muffler shell, an auxiliary muffler front cover, an auxiliary muffler rear cover, an auxiliary muffler muffler pipe, and an auxiliary muffler muffler cotton; The two ends of the auxiliary muffler shell are respectively welded to the auxiliary muffler front cover and the auxiliary muffler rear cover to form a sealed chamber; the auxiliary muffler muffler pipe is arranged in the auxiliary muffler shell, and the two ends respectively pass through the auxiliary muffler front cover and the auxiliary muffler rear cover and are welded to the auxiliary muffler front cover and the auxiliary muffler rear cover; the auxiliary muffler muffler cotton is filled in the space between the auxiliary muffler shell and the auxiliary muffler muffler pipe; The inlet end of the connecting pipe is sealed and connected to the air outlet of the main muffler shell, and the outlet end is sealed and connected to the auxiliary muffler pipe.
2. The gas engine post-processor according to claim 1, characterized in that: The main consumption shell is a double-layer structure, including a main consumption outer shell and a main consumption inner shell; a layer of heat insulation cotton is arranged between the main consumption outer shell and the main consumption inner shell.
3. The gas engine post-processor according to claim 2, characterized in that: The main exhaust front end cover is composed of a main exhaust front outer end cover, a main exhaust front inner end cover and a main exhaust front end cover heat insulation cotton arranged between the main exhaust front outer end cover and the main exhaust front inner end cover; The main exhaust rear end cover is composed of a main exhaust rear outer end cover, a main exhaust rear inner end cover and a main exhaust rear end cover heat insulation cotton arranged between the main exhaust rear outer end cover and the main exhaust rear inner end cover.
4. The gas engine post-processor according to claim 1, wherein: The main muffler part includes a front baffle and a rear baffle respectively fixed vertically to the front and rear ends of the main muffler shell; The front and rear ends of the catalytic unit are supported by the front baffle and the rear baffle respectively.
5. The gas engine post-processor according to claim 2, characterized in that: The catalytic unit includes a catalyst housing, a first TWC carrier, and a second TWC carrier; the catalyst housing is installed on the inner side of the main combustion inner housing, and the first TWC carrier and the second TWC carrier are installed in sequence from back to front inside the catalyst housing; a first TWC liner is sandwiched between the outer wall of the first TWC carrier and the inner wall of the catalyst housing; a second TWC liner is sandwiched between the outer wall of the second TWC carrier and the inner wall of the catalyst housing; a mesh plate welded to the catalyst housing is provided at the front of the TWC carrier, and a retaining ring is provided at the rear end.
6. The gas engine post-processor according to claim 3, characterized in that: The inlet end of the connecting pipe is inserted into the connection between the main muffler rear inner end cover and the main muffler inner shell through the air outlet of the main muffler shell and welded together, and the outlet end is inserted into the inlet end of the auxiliary muffler muffler pipe and welded, so that the main muffler part and the auxiliary muffler part are connected into a whole.
7. The gas engine post-processor according to claim 3, characterized in that: The outer wall of the main exhaust rear outer end cover is provided with a pair of wiring harness brackets and an oxygen sensor seat for fixing the oxygen sensor; the wiring harness bracket is used to fix the oxygen sensor wiring harness and the temperature sensor wiring harness.
8. The gas engine post-processor according to claim 1, characterized in that: An oxygen sensor seat for mounting an oxygen sensor is welded on the tail pipe of the auxiliary muffler pipe.
9. The gas engine post-processor according to claim 1, characterized in that: The processor is welded with a main and auxiliary exhaust connection bracket between the main exhaust housing and the auxiliary exhaust housing.
10. The gas engine post-processor according to claim 3, characterized in that: The processor is also provided with a heat insulation board mounting bracket and a vehicle mounting bracket; the heat insulation board mounting bracket is a pair, which are respectively welded on the front outer end cover of the main burner and the rear outer end cover of the main burner; the vehicle mounting bracket is welded on the main burner outer shell and connected to the square tube bracket of the vehicle.