CN112282976A - Turbulent flow type mixer for natural gas engine - Google Patents
Turbulent flow type mixer for natural gas engine Download PDFInfo
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- CN112282976A CN112282976A CN202011182619.0A CN202011182619A CN112282976A CN 112282976 A CN112282976 A CN 112282976A CN 202011182619 A CN202011182619 A CN 202011182619A CN 112282976 A CN112282976 A CN 112282976A
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- natural gas
- impeller
- mixer
- natural
- gas engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/04—Gas-air mixing apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a turbulent flow type mixer for a natural gas engine, which comprises a mixer shell, and a cross beam and an impeller which are fixed in the mixer shell, wherein an air inlet and a mixed gas outlet are respectively defined at two ends of the mixer shell along the longitudinal axis direction, a natural gas inlet is defined at one side of the mixer shell along the direction vertical to the longitudinal axis direction, the natural gas cross beam and the natural impeller are arranged corresponding to the natural gas inlet, and a central gas groove and a turbulent flow blade are arranged on the natural impeller. In the turbulent flow type mixer for the natural gas engine, the impeller is used for disturbing flow of gas, so that the mixing uniformity is improved; the impeller and the core are integrated into a whole, so that the structure is simplified.
Description
Technical Field
The invention relates to the technical field of natural gas engines, in particular to a turbulent flow type mixer for a natural gas engine.
Background
With increasingly stringent emission regulations, EGR exhaust gas recirculation technology has evolved significantly in the field of engines. EGR technology has also been used more and more widely in natural gas engines in recent years.
The combustible mixed gas of the natural gas engine is divided into three parts: air, EGR exhaust, and natural gas. The mixer of the EGR natural gas engine is divided into a gas mixer and an exhaust gas mixer, the gas mixer is used for mixing natural gas and fresh air, and the exhaust gas mixer is used for mixing mixed gas formed in the gas mixer with EGR waste gas taken from an exhaust pipe.
Through the retrieval, chinese utility model patent No. 201710093556.3 "blender and EGR blender for gas engine" discloses a natural gas engine's blender, should exhale the blender and be equipped with the impeller in the entrance, mixes EGR waste gas earlier, back blender natural gas, and EGR waste gas and natural gas pass through the square gas pocket on the core and get into the runner, and with air mixing, utilize the core to form the venturi structure simultaneously, utilize the relation of velocity of flow and pressure, promote the blender. However, the impeller is arranged at the upstream of the core in the mixer, which can cause the cyclone formed by the impeller to be damaged by the core, thereby causing uneven gas mixing and affecting the working effect of the engine.
Disclosure of Invention
The invention aims to provide a turbulent mixer for a natural gas engine, which can improve the gas mixing uniformity.
In order to achieve the purpose, the turbulent flow type mixer for the natural gas engine comprises a mixer shell, and a cross beam and an impeller which are fixed in the mixer shell, wherein an air inlet and a mixed gas outlet are respectively defined at two ends of the mixer shell along the longitudinal axis direction, a natural gas inlet is defined at one side of the mixer shell along the direction perpendicular to the longitudinal axis direction, the natural gas cross beam and the natural impeller are arranged corresponding to the natural gas inlet, and a central gas groove and a turbulent flow blade are arranged on the natural impeller.
Preferably, the turbulence blades on the impeller are streamline blades, and the central air groove of the impeller, which faces the natural gas inlet side, is of a structure with a narrow outer part and a wide inner part.
Preferably, the windward central air groove of the impeller is of a trapezoidal structure.
Preferably, a ratio of a flow area of the natural gas holes in the wall surface of the cross member to a flow area of the center gas groove of the impeller is 1: (3-4).
Preferably, a ratio of a flow area of the natural gas holes in the wall surface of the cross member to a flow area of the center gas groove of the impeller is 1: 3.5.
preferably, a groove with a section for forming a small air passage is formed on the rear end surface of the cross beam in the longitudinal axis direction and the front end surface of the impeller in the longitudinal axis direction.
Preferably, the cross beam is fixed with the mixer housing through friction welding after being fixed with the impeller through friction welding, and the welding position is arranged on a ring of annular end face where the natural impeller (5) is contacted with the mixer housing.
The invention has the beneficial effects that: in the turbulent flow type mixer for the natural gas engine, the impeller is used for disturbing flow of gas, so that the mixing uniformity is improved; the impeller and the core are integrated into a whole, so that the structure is simplified; a small air passage is formed between the cross beam and the impeller, and the natural gas guides a part of the natural gas to the center of the air passage of the mixer under the action of pressure, so that the natural gas can be fully contacted with air to promote mixing; controlling the proportion of the flow area of the natural gas holes on the wall surface of the cross beam and the flow area of the central gas groove of the impeller, and ensuring that the new mixed gas is uniformly distributed in the same section; the impeller adopts streamline blades, so that the gas resistance is reduced, and the freezing risk in a cold region is reduced; the air groove on the windward side of the impeller adopts a structure with a narrow outer part and a wide inner part, so that natural gas can be guided into the center of the air passage of the mixer or close to the center to the maximum extent, and uniform mixing is promoted.
Drawings
Fig. 1 is a schematic sectional view of a turbulent mixer for a natural gas engine according to a preferred embodiment of the present invention, taken along a gas flow direction.
The elements in the figures are numbered as follows: mixer housing 1, crossbeam 2, impeller 3.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Aiming at the problem of poor mixing uniformity of the existing mixer, the invention designs the turbulent flow type mixer for the natural gas engine, natural gas enters a gas channel of the mixer through a wall surface circular hole of a cross beam and a central gas groove of an impeller to be mixed with air, then the mixed gas is subjected to turbulent flow through the impeller to form cyclone, and the mixing uniformity is further improved in a subsequent pipeline.
Referring to fig. 1, the turbulent mixer for a natural gas engine according to a preferred embodiment of the present invention includes a mixer housing 1, a beam 2 and an impeller 3, all the components are installed and arranged by using the mixer housing 1 as a main body, the beam 2 is installed in the mixer housing 1, and the beam 2 and the impeller 3 are sequentially fixed in a longitudinal axis direction.
The mixer housing 1 defines an air inlet and a mixed gas outlet at both ends in the longitudinal axis direction, respectively, as indicated by arrows at the left and right sides in fig. 1, forming a gas passage in the longitudinal axis direction. The side of the mixer housing 1 perpendicular to the longitudinal axis defines a natural gas inlet, as indicated by the upper arrow in fig. 1. That is, air enters from the air inlet on one side in the longitudinal axis direction, is mixed with natural gas entering from the natural gas inlet on one side perpendicular to the longitudinal axis, and then flows out from the longitudinal axis to the mixed gas outlet on the other side. The mixer gas passage is defined along the longitudinal axis between the air inlet and the mixed gas outlet.
The wall surface of the beam 2 is provided with natural gas holes for natural gas entering the mixer housing 1 from a natural gas inlet to enter a mixer gas channel. The rear end surface of the longitudinal shaft of the beam 2 and the front end surface of the longitudinal shaft of the impeller 3 are correspondingly provided with grooves with square sections, and the grooves are jointed to form a small air passage. Under the action of pressure, one part of natural gas entering from the natural gas inlet is guided to the center of the gas channel of the mixer by the small gas channel, and the other part of natural gas directly enters the gas channel of the mixer through the natural gas hole, so that the natural gas can be fully contacted with the mixed gas of air and EGR waste gas, and the mixing is promoted. Meanwhile, in order to avoid uneven distribution of new mixed gas in the same section, the ratio of the flow area of the natural gas holes on the wall surface of the cross beam 2 to the flow area of the central gas groove of the impeller 3 can be controlled to adjust. In the preferred embodiment, the ratio of the flow area of the natural gas holes in the wall surface of the cross beam 2 to the flow area of the central gas groove of the impeller 3 is 1: (3-5), preferably 1: 3.5.
the impeller 3 is provided with turbulent streamline blades, and the windward side (towards the natural gas inlet side) air groove adopts a trapezoidal structure (narrow outside and wide inside), so that the natural gas can be guided into the center of the air passage of the mixer or close to the center to the maximum extent.
The crossbeam 2 and the impeller 3 are fixed by friction welding, and are fixed with the mixer shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface contacted with the impeller 6 and the mixer shell 1, so that the fixing effect and the sealing effect can be achieved.
The working principle of the turbulent flow type mixer for the natural gas engine is as follows: air enters the gas channel from an air inlet on one side of the cross beam 2 along the longitudinal axial direction, as indicated by the left arrow in fig. 1; natural gas enters the gas channel through natural gas holes in the wall surface of the cross beam 2 and a central gas groove of the impeller 3 to be mixed with mixed gas of air and EGR waste gas, then new mixed gas is disturbed by blades of the impeller 3 to form cyclone, and the mixing uniformity is further improved in a subsequent pipeline.
The turbulent flow type mixer for the natural gas engine is based on an impeller turbulent flow structure. Compared with the prior art, the turbulent flow type mixer for the natural gas engine has the following beneficial effects that:
(1) the impeller and the core are integrated into a whole, so that the structure is simplified;
(2) a small air passage is formed between the cross beam and the impeller, and the natural gas guides a part of the natural gas to the center of the air passage of the mixer under the action of pressure, so that the natural gas can be fully contacted with air to promote mixing;
(3) controlling the proportion of the flow area of the natural gas holes on the wall surface of the cross beam and the flow area of the central gas groove of the impeller, and ensuring that the new mixed gas is uniformly distributed in the same section;
(4) the impeller adopts streamline blades, so that the gas resistance is reduced, and the freezing risk in a cold region is reduced;
(5) the air groove on the windward side of the impeller adopts a structure with a narrow outer part and a wide inner part, so that natural gas can be guided into the center of the air passage of the mixer or close to the center to the maximum extent, and uniform mixing is promoted.
Beam-cross-beam the above-described embodiments of the present invention represent only a few embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. The utility model provides a turbulent flow mixer for natural gas engine which characterized in that: including mixer shell (1) and fixing crossbeam (2) and impeller (3) in mixer shell (1), mixer shell (1) is followed the axis of ordinates and is defined air inlet and mist outlet respectively to both ends, the perpendicular to is followed in mixer shell (1) indulge one side definition natural gas inlet of axial direction, natural gas crossbeam (2) and natural impeller (3) establish corresponding to the natural gas inlet sets up, be equipped with central gas groove and vortex blade on natural impeller (3).
2. The turbulent mixer for a natural gas engine according to claim 1, wherein: the turbulence blades on the impeller (3) are streamline blades, and the central air groove of the impeller (3) facing one side of the natural gas inlet is of a structure with a narrow outer part and a wide inner part.
3. The turbulent mixer for a natural gas engine according to claim 2, wherein: the windward side central air groove of the impeller (3) is of a trapezoidal structure.
4. The turbulent mixer for a natural gas engine according to claim 1, wherein: the ratio of the flow area of the natural gas holes in the wall surface of the cross beam (2) to the flow area of the central gas groove of the impeller (3) is 1: (3-4).
5. The turbulent mixer for a natural gas engine according to claim 4, wherein: the ratio of the flow area of the natural gas holes in the wall surface of the cross beam (2) to the flow area of the central gas groove of the impeller (3) is 1: 3.5.
6. the turbulent mixer for a natural gas engine according to claim 1, wherein: the rear end surface of the cross beam (2) in the longitudinal axial direction and the front end surface of the impeller (3) in the longitudinal axial direction are correspondingly provided with grooves with sections for forming small air passages.
7. The turbulent mixer for a natural gas engine according to claim 1, wherein: the cross beam (2) is fixed with the impeller (3) through friction welding after being fixed through friction welding, and the welding position is on a ring of annular end face where the natural impeller (5) is in contact with the mixer shell (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011182619.0A CN112282976B (en) | 2020-10-29 | 2020-10-29 | Turbulent flow type mixer for natural gas engine |
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| CN202011182619.0A CN112282976B (en) | 2020-10-29 | 2020-10-29 | Turbulent flow type mixer for natural gas engine |
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| CN112282976A true CN112282976A (en) | 2021-01-29 |
| CN112282976B CN112282976B (en) | 2022-03-29 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113357058A (en) * | 2021-05-31 | 2021-09-07 | 东风商用车有限公司 | Central flow guide type venturi integrated mixer |
| CN113417773A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Wall surface flow guide type venturi integrated mixer |
| CN113417768A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Central flow guiding type Venturi mixer |
| CN113417769A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Turbulent flow type venturi integrated mixer |
| CN113417770A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Wall surface flow guiding type Venturi mixer |
| CN113417775A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Turbulent flow type venturi mixer |
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| CN208651002U (en) * | 2018-04-04 | 2019-03-26 | 上海柴油机股份有限公司 | A kind of three medium mixing arrangement of natural gas engine |
| EP3604759A1 (en) * | 2018-07-30 | 2020-02-05 | Lg Electronics Inc. | Engine drive apparatus |
| CN210483912U (en) * | 2019-08-26 | 2020-05-08 | 东风商用车有限公司 | Premixing type gas mixer |
| US20200182487A1 (en) * | 2018-12-10 | 2020-06-11 | Lg Electronics Inc. | Cogeneration system |
| CN211116313U (en) * | 2019-11-28 | 2020-07-28 | 成都耐尔特科技有限公司 | Novel mixer |
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2020
- 2020-10-29 CN CN202011182619.0A patent/CN112282976B/en active Active
Patent Citations (5)
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| CN208651002U (en) * | 2018-04-04 | 2019-03-26 | 上海柴油机股份有限公司 | A kind of three medium mixing arrangement of natural gas engine |
| EP3604759A1 (en) * | 2018-07-30 | 2020-02-05 | Lg Electronics Inc. | Engine drive apparatus |
| US20200182487A1 (en) * | 2018-12-10 | 2020-06-11 | Lg Electronics Inc. | Cogeneration system |
| CN210483912U (en) * | 2019-08-26 | 2020-05-08 | 东风商用车有限公司 | Premixing type gas mixer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113357058A (en) * | 2021-05-31 | 2021-09-07 | 东风商用车有限公司 | Central flow guide type venturi integrated mixer |
| CN113417773A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Wall surface flow guide type venturi integrated mixer |
| CN113417768A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Central flow guiding type Venturi mixer |
| CN113417769A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Turbulent flow type venturi integrated mixer |
| CN113417770A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Wall surface flow guiding type Venturi mixer |
| CN113417775A (en) * | 2021-05-31 | 2021-09-21 | 东风商用车有限公司 | Turbulent flow type venturi mixer |
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| CN112282976B (en) | 2022-03-29 |
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