CN113417774A - Turbulent flow hedging type venturi integrated mixer - Google Patents
Turbulent flow hedging type venturi integrated mixer Download PDFInfo
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- CN113417774A CN113417774A CN202110605253.1A CN202110605253A CN113417774A CN 113417774 A CN113417774 A CN 113417774A CN 202110605253 A CN202110605253 A CN 202110605253A CN 113417774 A CN113417774 A CN 113417774A
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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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
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Abstract
The invention relates to a turbulent flow hedging type Venturi integrated mixer which comprises a shell, an EGR (exhaust gas recirculation) beam, an EGR impeller, a natural gas beam and a natural gas impeller, wherein the EGR beam and the EGR impeller are fixed to form an EGR core with a Venturi structure; the natural gas beam and the natural gas impeller are fixed into a whole and then are fixed with the shell; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller; natural gas is mixed with mixed gas mixed in the primary rotation through a natural gas beam wall surface air hole and a natural gas impeller central air groove inlet channel, then new mixed gas is mixed in the secondary rotation under the flow guide effect of a natural gas impeller, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite, and the mixing is promoted by utilizing the sudden change of the gas flow direction.
Description
Technical Field
The invention relates to the technical field of natural gas engine air inlet systems, in particular to a turbulent flow hedging type Venturi integrated mixer.
Background
Exhaust Gas Recirculation (EGR) is a technology for separating a part of exhaust gas after combustion in an internal combustion engine and introducing the separated exhaust gas into an intake side for re-combustion, and is mainly intended to reduce nitrogen oxides (NOx) in the exhaust gas and improve fuel efficiency when sharing a part of a load. The internal combustion engine has very low or no oxygen content in the exhaust gas after combustion, and the exhaust gas mixed with the intake gas causes the oxygen concentration in the intake gas to decrease, so that the following phenomena occur: the oxygen content lower than the atmospheric air lowers the temperature at the time of combustion, and the generation of nitrogen oxides (NOx) is suppressed. When the combustion temperature is lowered, the heat energy dissipation of the cylinder, the wall surface of the combustion chamber and the surface of the piston is reduced, and the loss caused by thermal dissociation is slightly reduced.
With the strictness of emission regulations and the rising of fuel prices, the application of the EGR technology to engines is more and more extensive. In the past, the recirculated exhaust gas has a long pipeline to be mixed with fresh air before entering a cylinder, and the introduced amount of the recirculated exhaust gas (EGR rate) is low, so that an EGR mixer is not specially designed. With the improvement and maturity of EGR technology, the amount of circulating exhaust gas (EGR rate) is larger and larger, and the requirement of engine compactness makes the air inlet pipeline shorter, so the uniformity of mixing of the recirculated exhaust gas and the fresh air obtained by the traditional method can not meet the requirement of stable operation of the engine.
Chinese patent: a mixer for gas engine and EGR mixer (application No. 201710093556.3) disclose a mixer for natural gas engine, which is characterized in that an impeller is arranged at an inlet, EGR waste gas is mixed first, then natural gas is mixed, and the EGR waste gas and the natural gas enter a flow channel through a square air hole on a core and are mixed with air.
The patent specifically discloses a mixer for gas engine, including the mixer body that link up from top to bottom, mixer body upper end is the air inlet, and the lower extreme is the gas outlet, and the air inlet department of mixer body is equipped with the fluid disturbing, and the gas outlet department is equipped with the gas core, is equipped with EGR core between fluid disturbing and the gas core, is equipped with waste gas air inlet and gas air inlet on the mixer body, and EGR core and waste gas air inlet intercommunication, EGR core are used for spouting the waste gas that the waste gas air inlet was inserted into in the mixer body. The gas core is communicated with the gas inlet and is used for spraying the gas accessed by the gas inlet into the mixer body. The EGR core and the gas core have the same structure, the gas core comprises a guide ring, a guide column arranged in the guide ring and a ventilating column arranged between the guide ring and the inner wall of the mixer body, the cross sections of the guide column, the guide ring and the ventilating column are all in a water drop shape which is gradually reduced along the air flow direction, and the guide column, the guide ring and the ventilating column are all in a hollow structure. The guide column, the guide ring and the ventilation column are all provided with spray holes, the spray holes are uniformly arranged at the widest positions of the cross sections of the two sides of the guide column, the guide ring and the ventilation column, the tangent line of the position point of the spray holes is parallel to the flow direction of air from top to bottom, and all the spray holes are positioned on the same horizontal plane. The two guide columns are vertically intersected at the circle center position of the guide ring and divide the guide ring into four uniform parts, and the four ventilation columns divide the space between the guide ring and the mixer body into four uniform parts.
The EGR core and the gas core are different in that the EGR core and the gas core have an included angle of 45 degrees on the horizontal plane when being installed in the mixer body, wherein a ventilation column of the EGR core is communicated with the waste gas inlet, and a ventilation column of the gas core is communicated with the gas inlet. The sizes and the lengths of the guide columns, the guide rings and the ventilation columns of the EGR core and the gas core can be flexibly set according to the requirements of practical application, in the embodiment, the spray holes on the EGR core are closer to the lower part, and the spray holes on the gas core are closer to the upper part. Two circles of spray holes are annularly distributed on the inner wall of the mixer body, the first circle of spray holes and the spray holes of the EGR core are positioned on the same plane, and the second circle of spray holes and the spray holes of the gas core are positioned on the same plane. The spray holes of the EGR core and the first circle of spray holes are communicated with a waste gas inlet, and the spray holes of the gas core and the second circle of spray holes are communicated with a gas inlet.
The spoiler comprises a spoiler ring and a spoiler obliquely arranged between the spoiler ring and the inner wall of the mixer body; the spoiler separates the space between the spoiler ring and the mixer body into six uniform parts. In the mixer body, the flow guide ring, the flow guide column, the ventilating column and the inner wall of the mixer body mutually form a plurality of Venturi tube structures, air enters the mixer body from the air inlet and is disordered by a turbulent flow body and respectively enters the Venturi tube structures, due to the action of the Venturi effect, the air flow rate of the position of the spray hole is increased, low pressure is generated at the position at the same time, the adsorption effect is generated on the gas in the spray hole, the kinetic energy of the sprayed gas in the spray hole is increased, the gas and the air are mixed more uniformly, and therefore the gas, the air and the waste gas which pass through the mixer body have high mixing uniformity
This patent passes through the core structure with EGR waste gas and natural gas through the square gas pocket entering runner on the core, mixes with the air, utilizes the core to form the venturi structure simultaneously, utilizes the relation of velocity of flow and pressure, promotes the blender. However, the impeller of the patent scheme is arranged at the upstream of the core, so that the core can damage the cyclone formed by the impeller, the streamline form of the impeller is poor, the pressure loss is high, the air inflow of an engine is insufficient, the output power of the engine is low, and meanwhile, the square air holes can cause high addition cost and small effective flow area.
Disclosure of Invention
In order to solve the problems, the invention provides an internal combustion engine connecting rod with an eccentric rod body and a connecting rod assembly.
The technical scheme adopted by the invention is as follows: the utility model provides a vortex hedging formula venturi integrated mixer which characterized in that: the EGR device comprises a shell, an EGR beam, an EGR impeller, a natural gas beam and a natural gas impeller, wherein the EGR beam, the EGR impeller, the natural gas beam and the natural gas impeller are sequentially arranged along an air passage in the shell; the natural gas cross beam and the natural gas impeller are fixed into a whole and then are fixed with the shell;
the air enters the air passage from the inlet, the EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the air is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the air is subjected to one-time rotary mixing after passing through the EGR impeller; natural gas is mixed with mixed gas mixed in the primary rotation through a natural gas beam wall surface air hole and a natural gas impeller central air groove inlet channel, then new mixed gas is mixed in the secondary rotation under the flow guide effect of a natural gas impeller, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite, and the mixing is promoted by utilizing the sudden change of the gas flow direction.
Preferably, the EGR beam and the EGR impeller are fixed by friction welding.
Preferably, the EGR core and the housing are fixed by friction welding.
Preferably, the welding position of the EGR core and the shell is on a circle of annular surface where the EGR beam and the shell are contacted, so that the fixing effect and the sealing effect can be achieved.
Preferably, the rear end face of the EGR cross beam and the front end face of the EGR impeller are both provided with a groove with a square cross section, the two grooves are attached to form a small air passage, one part of EGR waste gas is guided to the center of the air passage of the mixer by the small air passage under the action of pressure, and the other part of EGR waste gas directly enters the air passage of the mixer through the wall surface air hole, so that the gas to be mixed is fully contacted with the air, and the mixing is promoted.
Preferably, a ratio of the EGR core wall surface air hole flow area to the center air hole flow area is set to 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer.
Preferably, the rear end face of the natural gas cross beam and the front end face of the natural gas impeller are both provided with a groove with a square cross section, the natural gas cross beam and the natural gas impeller are attached to form a small gas passage, one part of natural gas is guided to the center of the gas passage of the mixer by the small gas passage under the action of pressure, and the other part of natural gas directly enters the gas passage of the mixer through the wall surface gas holes, so that the gas to be mixed is fully contacted with the air, and the mixing is promoted.
Preferably, the ratio of the flow area of the gas holes in the wall surface of the natural gas beam to the flow area of the center gas groove of the natural gas impeller is set to 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer.
Preferably, the EGR impeller and the natural gas impeller both adopt streamline blades, so that gas resistance is reduced, and the freezing risk in a cold region is reduced.
Preferably, the air grooves on the windward sides of the EGR impeller and the natural gas impeller are in a trapezoidal structure with a narrow outer part and a wide inner part, so that the gas to be mixed can be guided to the axis of the air passage of the mixer to the maximum extent.
The beneficial effects obtained by the invention are as follows:
1. the EGR core is provided with a Venturi structure, and the central air hole and the wall surface air hole are arranged at the position with the smallest circulation area by the EGR impeller and the natural gas impeller part, so that the mixing uniformity is improved by the relationship between the flow velocity and the pressure;
2. the EGR core completes the transition of a large diameter and a small diameter by means of an arc, so that the gas resistance is reduced, and the gas flow field is more stable;
3. the EGR beam and the EGR impeller are fixed to form an EGR core, so that the axial length of the EGR beam is lengthened, the area of an inlet of the EGR beam can be increased, more gas enters the mixer air passage through the EGR beam, and the gas to be mixed is guided to the axis of the mixer air passage to the maximum extent;
4. a groove with a square cross section is processed on the rear end face of the EGR beam and the front end face of the EGR impeller, the two are jointed to form a small air passage, so that a part of the gas to be mixed is guided to the center of the air passage of the mixer by the small air passage under the action of pressure, and the other part of the gas directly enters the air passage of the mixer through the wall surface air hole, so that the gas to be mixed is fully contacted with the air, and the mixing is promoted; setting the ratio of the EGR core wall surface air hole flow area to the center air hole flow area as 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the air passage of the mixer; similarly, a groove with a square cross section is processed on the rear end face of the natural gas beam and the front end face of the natural gas impeller, the natural gas beam and the groove are jointed to form a small gas passage, so that a part of the gas to be mixed is guided to the center of the gas passage of the mixer by the small gas passage under the action of pressure, and the other part of the gas directly enters the gas passage of the mixer through the wall surface gas hole, so that the gas to be mixed is fully contacted with the air, and the mixing is promoted; the ratio of the flow area of the gas holes in the wall surface of the natural gas beam to the flow area of the gas holes in the center of the natural gas impeller is set to be 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the air passage of the mixer;
5. the EGR impeller and the natural gas impeller adopt streamline blades, so that the gas resistance is reduced, and the freezing risk in a cold region is reduced;
6. the air grooves on the windward sides of the EGR impeller and the natural gas impeller adopt a trapezoidal structure (the outer part is narrow and the inner part is wide), so that the gas to be mixed can be guided to the axis of the air passage of the mixer to the maximum extent;
7. the mixer as a whole uses two sets of counter-rotating impellers (the rotation directions of the EGR impeller and the natural gas impeller are opposite), and the mixing is promoted by utilizing the sudden change of the gas flow direction.
Drawings
FIG. 1 is a schematic structural view of the present invention;
reference numerals: 1. a housing; 2. an EGR beam; 3. an EGR impeller; 4. a natural gas beam; 5. a natural gas impeller; 6. natural gas straight joint.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the turbulent flow hedging type venturi integrated mixer of the present invention comprises a housing 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the housing 1, the EGR beam 2 and the EGR impeller 3 are fixed to form an EGR core having a venturi structure, and then fixed to the housing 1; the natural gas beam 4 and the natural gas impeller 5 are fixed to form a whole and then fixed with the shell 1;
air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction.
In one embodiment, the turbulent flow hedging type Venturi integrated mixer comprises a shell 1, an EGR cross beam 2, an EGR impeller 3, a natural gas cross beam 4 and a natural gas impeller 5, wherein the EGR cross beam 2, the EGR impeller 3, the natural gas cross beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, and the EGR cross beam 3 and the EGR impeller 4 are fixed through friction welding to form an EGR core with a Venturi structure and then are fixed with the shell 1; the natural gas beam 4 and the natural gas impeller 5 are fixed to form a whole and then fixed with the shell 1; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed to form a whole and then fixed with the shell 1; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed with the shell 1 after being shaped into a whole by friction welding; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed into a whole by friction welding, and then are fixed with the shell 1 by friction welding, and the welding position is on a circle of annular surface where the natural gas beam 4 and the shell 1 are contacted, so that the fixing effect and the sealing effect can be achieved; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed into a whole by friction welding, and then are fixed with the shell 1 by friction welding, and the welding position is on a circle of annular surface where the natural gas beam 4 and the shell 1 are contacted, so that the fixing effect and the sealing effect can be achieved; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction. A cross-sectional shape all opens for square groove before 2 rear end faces of EGR crossbeam and 3 front end face processing of EGR impeller, and the two laminating forms little air flue, and EGR waste gas is under the effort of pressure, and partly is by little air flue direction blender air flue center, and another part passes through wall gas pocket direct access blender air flue, can make like this treat that gas mixture fully contacts with the air, promotes to mix.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed into a whole by friction welding, and then are fixed with the shell 1 by friction welding, and the welding position is on a circle of annular surface where the natural gas beam 4 and the shell 1 are contacted, so that the fixing effect and the sealing effect can be achieved; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction. The rear end face of the EGR beam 2 and the front end face of the EGR impeller 3 are both provided with a groove with a square cross section, the two grooves are jointed to form a small air passage, one part of EGR waste gas is guided to the center of the air passage of the mixer by the small air passage under the action of pressure, and the other part of EGR waste gas directly enters the air passage of the mixer through the wall surface air holes, so that the gas to be mixed can be fully contacted with the air, and the mixing is promoted; the ratio of the EGR core wall surface air hole flow area to the center air hole flow area is set as 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed into a whole by friction welding, and then are fixed with the shell 1 by friction welding, and the welding position is on a circle of annular surface where the natural gas beam 4 and the shell 1 are contacted, so that the fixing effect and the sealing effect can be achieved; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction. The rear end face of the EGR beam 2 and the front end face of the EGR impeller 3 are both provided with a groove with a square cross section, the two grooves are jointed to form a small air passage, one part of EGR waste gas is guided to the center of the air passage of the mixer by the small air passage under the action of pressure, and the other part of EGR waste gas directly enters the air passage of the mixer through the wall surface air holes, so that the gas to be mixed can be fully contacted with the air, and the mixing is promoted; the ratio of the EGR core wall surface air hole flow area to the center air hole flow area is set as 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer. A groove with a square cross section is formed in the rear end face of the natural gas beam 4 and the front end face of the natural gas impeller 5, the natural gas beam and the natural gas impeller are attached to form a small air passage, one part of the natural gas is guided to the center of the air passage of the mixer by the small air passage, and the other part of the natural gas directly enters the air passage of the mixer through the wall surface air hole, so that the mixed gas to be treated can be fully contacted with air, and mixing is promoted.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed into a whole by friction welding, and then are fixed with the shell 1 by friction welding, and the welding position is on a circle of annular surface where the natural gas beam 4 and the shell 1 are contacted, so that the fixing effect and the sealing effect can be achieved; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction. The rear end face of the EGR beam 2 and the front end face of the EGR impeller 3 are both provided with a groove with a square cross section, the two grooves are jointed to form a small air passage, one part of EGR waste gas is guided to the center of the air passage of the mixer by the small air passage under the action of pressure, and the other part of EGR waste gas directly enters the air passage of the mixer through the wall surface air holes, so that the gas to be mixed can be fully contacted with the air, and the mixing is promoted; the ratio of the EGR core wall surface air hole flow area to the center air hole flow area is set as 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer. A groove with a square cross section is formed in the rear end face of the natural gas beam 4 and the front end face of the natural gas impeller 5, the natural gas beam and the natural gas impeller are attached to form a small air passage, one part of the natural gas is guided to the center of the air passage of the mixer by the small air passage, and the other part of the natural gas directly enters the air passage of the mixer through the wall surface air hole, so that the mixed gas to be treated can be fully contacted with air, and mixing is promoted. The ratio of the flow area of the gas holes on the wall surface of the natural gas beam 4 to the flow area of the central gas groove of the natural gas impeller 5 is set to be 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer.
In one embodiment, a turbulent flow hedging type venturi integrated mixer comprises a shell 1, an EGR beam 2, an EGR impeller 3, a natural gas beam 4 and a natural gas impeller 5, wherein the EGR beam 2, the EGR impeller 3, the natural gas beam 4 and the natural gas impeller 5 are sequentially arranged along an air passage in the shell 1, the EGR beam and the EGR impeller are fixed through friction welding to form an EGR core with a venturi structure, and then the EGR core is fixed with the shell 1 through friction welding, and the welding position of the EGR core and the shell 1 is on a circle of annular surface where the EGR beam 2 is contacted with the shell 1, so that a fixing effect and a sealing effect can be achieved; the natural gas beam 4 and the natural gas impeller 5 are fixed into a whole by friction welding, and then are fixed with the shell 1 by friction welding, and the welding position is on a circle of annular surface where the natural gas beam 4 and the shell 1 are contacted, so that the fixing effect and the sealing effect can be achieved; air enters the air passage from the inlet, EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the gas is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the gas is subjected to primary rotary mixing after passing through the EGR impeller 3; natural gas is mixed with mixed gas mixed in a primary rotation mode through a gas hole in the wall surface of the natural gas cross beam 4 and a gas groove inlet channel in the center of the natural gas impeller 5, new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller 5, the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite (namely the rotation directions of the EGR impeller 3 and the natural gas impeller 5 are opposite), and mixing is promoted by utilizing sudden change of the gas flow direction. The rear end face of the EGR beam 2 and the front end face of the EGR impeller 3 are both provided with a groove with a square cross section, the two grooves are jointed to form a small air passage, one part of EGR waste gas is guided to the center of the air passage of the mixer by the small air passage under the action of pressure, and the other part of EGR waste gas directly enters the air passage of the mixer through the wall surface air holes, so that the gas to be mixed can be fully contacted with the air, and the mixing is promoted; the ratio of the EGR core wall surface air hole flow area to the center air hole flow area is set as 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer. A groove with a square cross section is formed in the rear end face of the natural gas beam 4 and the front end face of the natural gas impeller 5, the natural gas beam and the natural gas impeller are attached to form a small air passage, one part of the natural gas is guided to the center of the air passage of the mixer by the small air passage, and the other part of the natural gas directly enters the air passage of the mixer through the wall surface air hole, so that the mixed gas to be treated can be fully contacted with air, and mixing is promoted. The ratio of the flow area of the gas holes on the wall surface of the natural gas beam 4 to the flow area of the central gas groove of the natural gas impeller 5 is set to be 1: 3.5, the gas to be mixed can be prevented from being unevenly distributed in the same section after entering the gas passage of the mixer. The EGR impeller 3 and the natural gas impeller 5 both adopt streamline blades, so that the gas resistance is reduced, and the freezing risk in a cold region is reduced; the air grooves on the windward sides of the EGR impeller 3 and the natural gas impeller 5 are of a trapezoidal structure with a narrow outer part and a wide inner part, and gas to be mixed can be guided to the axis of the air passage of the mixer to the maximum extent.
The test results show that:
mixing uniformity: 99.45% of EGR waste gas and 94.83% of natural gas;
pressure resistance: EGR exhaust 11.5kpa, natural gas 5.3 kpa.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Here, it should be noted that the description of the above technical solutions is exemplary, the present specification may be embodied in different forms, and should not be construed as being limited to the technical solutions set forth herein. Rather, these descriptions are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solution of the present invention is limited only by the scope of the claims.
The shapes, sizes, ratios, angles, and numbers disclosed to describe aspects of the specification and claims are examples only, and thus, the specification and claims are not limited to the details shown. In the following description, when a detailed description of related known functions or configurations is determined to unnecessarily obscure the focus of the present specification and claims, the detailed description will be omitted.
Where the terms "comprising", "having" and "including" are used in this specification, there may be another part or parts unless otherwise stated, and the terms used may generally be in the singular but may also be in the plural.
It should be noted that although the terms "first," "second," "top," "bottom," "side," "other," "end," "other end," and the like may be used and used in this specification to describe various components, these components and parts should not be limited by these terms. These terms are only used to distinguish one element or section from another element or section. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, with the top and bottom elements being interchangeable or switchable with one another, where appropriate, without departing from the scope of the present description; the components at one end and the other end may be of the same or different properties to each other.
In describing positional relationships, for example, when positional sequences are described as being "on.. above", "over.. below", "below", and "next", unless such words or terms are used as "exactly" or "directly", they may include cases where there is no contact or contact therebetween. If a first element is referred to as being "on" a second element, that does not mean that the first element must be above the second element in the figures. The upper and lower portions of the member will change depending on the angle of view and the change in orientation. Thus, in the drawings or in actual construction, if a first element is referred to as being "on" a second element, it can be said that the first element is "under" the second element and the first element is "over" the second element. In describing temporal relationships, unless "exactly" or "directly" is used, the description of "after", "subsequently", and "before" may include instances where there is no discontinuity between steps. The features of the various embodiments of the present invention may be partially or fully combined or spliced with each other and performed in a variety of different configurations as would be well understood by those skilled in the art. Embodiments of the invention may be performed independently of each other or may be performed together in an interdependent relationship.
Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.
Claims (10)
1. The utility model provides a vortex hedging formula venturi integrated mixer which characterized in that: the EGR cooler comprises a shell (1), an EGR cross beam (2), an EGR impeller (3), a natural gas cross beam (4) and a natural gas impeller (5), wherein the EGR cross beam (2), the EGR impeller (3), the natural gas cross beam (4) and the natural gas impeller (5) are sequentially arranged along an air passage in the shell (1), the EGR cross beam (2) and the EGR impeller (3) are fixed to form an EGR core with a Venturi structure, and then the EGR core is fixed to the shell (1); the natural gas cross beam (4) and the natural gas impeller (5) are fixed to form a whole and then are fixed with the shell (1);
the air enters the air passage from the inlet, the EGR waste gas enters the air passage through the air holes in the wall surface of the EGR core and the central air hole and then is mixed with the air in the air passage, the flow rate of the air is improved by virtue of a Venturi structure, the mixing is promoted by depending on the relation between the flow rate and the pressure, and the air is subjected to primary rotary mixing after passing through the EGR impeller (3); natural gas is mixed with mixed gas mixed in a primary rotation mode through a natural gas cross beam (4) wall surface air hole and a natural gas impeller (5) central air groove inlet channel, then new mixed gas is mixed in a secondary rotation mode under the flow guiding effect of the natural gas impeller (5), the rotation directions of the primary rotation mixing and the secondary rotation mixing are opposite, and mixing is promoted by the aid of sudden change of gas flow directions.
2. The turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: the EGR cross beam (2) and the EGR impeller (3) are fixed through friction welding.
3. The turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: the EGR core and the shell (1) are fixed through friction welding.
4. The turbulent opposed-impulse venturi integrated mixer of claim 3, wherein: the welding position of the EGR core and the shell (1) is on a ring of annular surface where the EGR beam (2) is contacted with the shell (1).
5. The turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: a groove with a square cross section is formed in the machining of the rear end face of the EGR beam (2) and the front end face of the EGR impeller (3), the EGR beam and the EGR impeller are attached to form a small air passage, one part of EGR waste gas is guided to the center of the air passage of the mixer by the small air passage under the action of pressure, and the other part of EGR waste gas directly enters the air passage of the mixer through the wall surface air hole.
6. The turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: the ratio of the EGR core wall surface air hole flow area to the center air hole flow area is set to be 1: 3.5.
7. the turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: the natural gas cross beam (4) rear end face and the natural gas impeller (5) front end face are processed to be provided with grooves with square cross sections, the grooves are attached to form small air passages, one part of the natural gas is guided to the center of the mixer air passage by the small air passages under the action of pressure, and the other part of the natural gas directly enters the mixer air passage through the wall air holes.
8. The turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: the ratio of the flow area of the gas holes in the wall surface of the natural gas beam (4) to the flow area of the central gas groove of the natural gas impeller (5) is set to be 1: 3.5.
9. the turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: the EGR impeller (3) and the natural gas impeller (5) both adopt streamline blades.
10. The turbulent opposed-impulse venturi integrated mixer of claim 1, wherein: the air grooves on the windward sides of the EGR impeller (3) and the natural gas impeller (5) are of a trapezoidal structure with a narrow outer part and a wide inner part.
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