CN113417771A - Wall surface flow guide opposite impact type venturi integrated mixer - Google Patents
Wall surface flow guide opposite impact type venturi integrated mixer Download PDFInfo
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- CN113417771A CN113417771A CN202110605180.6A CN202110605180A CN113417771A CN 113417771 A CN113417771 A CN 113417771A CN 202110605180 A CN202110605180 A CN 202110605180A CN 113417771 A CN113417771 A CN 113417771A
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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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- 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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- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention relates to a wall surface diversion hedging type Venturi integrated mixer which comprises a shell, an EGR (exhaust gas recirculation) core, a cross arm, a fixed pin, a natural gas beam and a natural gas impeller, wherein air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole on the EGR core and a cross arm central air hole in sequence, the flow rate of the gas is improved by virtue of a Venturi structure formed in the EGR core, and the mixing is promoted by virtue of the relation between the flow rate and the pressure; a wall guide plate is additionally arranged at the flaring position of the Venturi structure in the EGR core, so that gas is subjected to primary rotary mixing; the natural gas loops through and gets into the air flue behind natural gas crossbeam wall round hole and the central gas tank of natural gas impeller and mixes with the mist secondary rotation, the rotation direction that the rotatory mixture of once is opposite with the rotatory mixture of secondary, and the mist that the rotation mixes passes through the reverse vortex of natural gas impeller, utilizes the offset to promote to mix, has formed rotatory air current simultaneously, promotes the homogeneity of mixing.
Description
Technical Field
The invention relates to the technical field of natural gas engine air inlet systems, in particular to a wall surface diversion 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 wall water conservancy diversion hedging formula venturi integrated mixer which characterized in that: the EGR core, the natural gas beam and the natural gas impeller are sequentially and fixedly arranged in the shell along the direction of an air passage, and a Venturi structure is formed in the EGR core; the natural gas cross beam and the natural gas impeller are fixed together and then fixed with the shell as a whole; the cross arm is fixedly arranged in the middle of the EGR core along the air passage direction through a fixing pin; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole on the EGR core in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate is additionally arranged at the flaring position of the Venturi structure in the EGR core, so that gas is subjected to primary rotary mixing; the natural gas loops through get into the air flue behind natural gas crossbeam wall round hole and the central gas groove of natural gas impeller and mix with the rotatory mixture of mist secondary, the rotation direction that the rotatory mixture of one time is mixed with the rotatory mixture of secondary is opposite, and the mist that the rotatory mixture of one time passes through the reverse vortex of natural gas impeller, utilizes the offset to promote to mix, has formed rotatory air current simultaneously, further promotes the homogeneity of mixing at follow-up pipeline.
Preferably, the EGR core is welded and fixed to the housing.
Preferably, the EGR core is fixed to the housing by friction welding at a position on a ring-shaped surface where the EGR core and the housing are in contact.
Preferably, the natural gas cross beam and the natural gas impeller are fixed through friction welding and then fixed with the shell as a whole through friction welding, and the welding position is arranged on a ring of annular surface where the natural gas impeller and the shell are in contact.
Preferably, the four support arms of the cross arm are mutually positioned, the middle part of the cross arm is oriented by a fixing pin, and the outer side of the cross arm is fixed with the EGR core through spot welding.
Preferably, the thick end of the cross arm is in front, and the thin end is in back; the central air hole of the cross arm is arranged on an inclined plane which is transited from the thick end to the thin end, and natural gas and air are promoted to be mixed by means of a formed negative pressure area.
Preferably, the wick is gradually enlarged along the apertures at both ends of the air passage at the cross arm.
Preferably, the fixing pin end is tapered.
Preferably, grooves with square cross sections are machined in the rear end face of the natural gas cross beam and the front end face of the natural gas impeller, the grooves are attached to form a small gas passage, so that 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 hole; the flow area ratio of the circular hole in the wall surface of the natural gas beam to the central gas groove of the natural gas impeller is 1: 3.5.
preferably, the natural gas impeller adopts streamline blades, and the windward side air groove of the natural gas impeller adopts a trapezoidal structure with a narrow outer part and a wide inner part.
The beneficial effects obtained by the invention are as follows:
1. the EGR core is in a Venturi structure, the central air groove is placed at the position with the smallest flow area by the natural gas impeller part, and the central air groove and the Venturi impeller both improve the mixing uniformity by the aid of the relation between flow speed and pressure;
2. the thick end of the cross arm of the EGR core is arranged in front of the exhaust gas recirculation system, the thin end of the cross arm of the EGR core is arranged behind the exhaust gas recirculation system, and the central air hole is formed on an inclined plane where the thick end is transited to the thin end, so that the EGR exhaust gas and air are promoted to be mixed by means of a formed negative pressure area;
3. 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;
4. the fixed pin at the center of the EGR core adopts a pointed structure, so that the pressure loss is reduced;
5. a wall surface guide plate is added at the flaring part of the Venturi structure and is matched with the impeller to promote mixing by utilizing opposite impact; after the air and the EGR waste gas are mixed by the wall surface guide plate (the air and the EGR waste gas are in a rotating state), the air and the EGR waste gas are disturbed by the impeller in a reverse direction (the direction is opposite to that of the wall surface guide plate), the mixing is promoted by utilizing the hedging, meanwhile, the rotating air flow is formed, and the mixing uniformity is further improved in a subsequent pipeline;
6. a groove with a square cross section is machined 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 attached to form a small gas passage, so that 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 hole, so that mixed gas (air and EGR waste gas) can be fully contacted with the natural gas to promote mixing; setting the ratio of the wall surface air hole flow area to the central air groove flow area as 1: 3.5, the non-uniform distribution of the natural gas in the same section after the natural gas enters the air passage of the mixer can be avoided;
7. the natural gas impellers all adopt streamline blades, so that the gas resistance is reduced, and the freezing risk in a cold area is reduced;
8. the windward side air groove of the natural gas impeller adopts a trapezoidal structure (narrow outside and wide inside), and can guide the gas to be mixed to the axis of the air passage of the mixer to the maximum extent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the inlet of the airway;
FIG. 3 is a schematic view of the structure of the airway outlet;
reference numerals: 1. a housing; 2. an EGR core; 3. a cross arm; 31. a central air hole of the cross arm; 4. a fixing pin; 5. a natural gas beam; 6. a natural gas impeller; 7. a natural gas straight joint; 8. a wall surface guide plate.
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. 1-3, the wall surface diversion hedging type venturi integrated mixer of the present invention comprises a housing 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the housing 1 along an air passage direction, and a venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed together and then fixed with the shell 1 as a whole; the cross arm 3 is fixedly arranged in the middle of the EGR core 2 along the air passage direction through a fixing pin 4; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline.
In one embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along the direction of an air passage, the EGR core 2 is fixedly welded with the shell 1, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed together and then fixed with the shell 1 as a whole; the cross arm 3 is fixedly arranged in the middle of the EGR core 2 along the air passage direction through a fixing pin 4; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed together and then fixed with the shell 1 as a whole; the cross arm 3 is fixedly arranged in the middle of the EGR core 2 along the air passage direction through a fixing pin 4; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed by friction welding and then fixed with the shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted, so that the fixing effect and the sealing effect can be achieved; the cross arm 3 is fixedly arranged in the middle of the EGR core 2 along the air passage direction through a fixing pin 4; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed by friction welding and then fixed with the shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted, so that the fixing effect and the sealing effect can be achieved; the four support arms of the cross arm 3 are mutually positioned, the middle part of the cross arm 3 is oriented by a fixing pin, and the outer side of the cross arm 3 is fixed with the EGR core 22 by spot welding; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed by friction welding and then fixed with the shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted, so that the fixing effect and the sealing effect can be achieved; the four support arms of the cross arm 3 are mutually positioned, the middle part of the cross arm 3 is oriented by a fixing pin, the outer side of the cross arm 3 is fixed with the EGR core 22 by spot welding, the thick end of the cross arm 3 is arranged in front, and the thin end is arranged behind; the cross arm central air hole 31 is arranged on an inclined plane which is transited from a thick end to a thin end, and natural gas and air are promoted to be mixed by means of a formed negative pressure area; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed by friction welding and then fixed with the shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted, so that the fixing effect and the sealing effect can be achieved; the four support arms of the cross arm 3 are mutually positioned, the middle part of the cross arm 3 is oriented by a fixing pin, the outer side of the cross arm 3 is fixed with the EGR core 22 by spot welding, the thick end of the cross arm 3 is arranged in front, and the thin end is arranged behind; the cross arm central air hole 31 is arranged on an inclined plane which is transited from a thick end to a thin end, and natural gas and air are promoted to be mixed by means of a formed negative pressure area; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline. The aperture of the EGR core 2 at the cross arm 3 along the two ends of the air passage is gradually increased, the transition of the large diameter and the small diameter is completed by the EGR core 2 through the arc, the gas resistance is reduced, and the gas flow field is more stable.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed by friction welding and then fixed with the shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted, so that the fixing effect and the sealing effect can be achieved; the four support arms of the cross arm 3 are mutually positioned, the middle part of the cross arm 3 is oriented by a fixing pin, the outer side of the cross arm 3 is fixed with the EGR core 22 by spot welding, the thick end of the cross arm 3 is arranged in front, and the thin end is arranged behind; the cross arm central air hole 31 is arranged on an inclined plane which is transited from a thick end to a thin end, and natural gas and air are promoted to be mixed by means of a formed negative pressure area; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline. The aperture of the EGR core 2 at the cross arm 3 along the two ends of the air passage is gradually increased, the transition of the large diameter and the small diameter is completed by the EGR core 2 by means of the circular arc, the gas resistance is reduced, and the gas flow field is more stable; the end part of the fixing pin 4 is conical, so that the pressure loss is reduced.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed by friction welding and then fixed with the shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted, so that the fixing effect and the sealing effect can be achieved; the four support arms of the cross arm 3 are mutually positioned, the middle part of the cross arm 3 is oriented by a fixing pin, the outer side of the cross arm 3 is fixed with the EGR core 22 by spot welding, the thick end of the cross arm 3 is arranged in front, and the thin end is arranged behind; the cross arm central air hole 31 is arranged on an inclined plane which is transited from a thick end to a thin end, and natural gas and air are promoted to be mixed by means of a formed negative pressure area; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline. The aperture of the EGR core 2 at the cross arm 3 along the two ends of the air passage is gradually increased, the transition of the large diameter and the small diameter is completed by the EGR core 2 by means of the circular arc, the gas resistance is reduced, and the gas flow field is more stable; the end part of the fixing pin 4 is conical, so that the pressure loss is reduced. The rear end face of the natural gas beam 5 and the front end face of the natural gas impeller 6 are both provided with a groove with a square cross section, the natural gas beam and the groove are jointed to form a small gas passage, so that one part of the 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 the natural gas directly enters the gas passage of the mixer through a wall surface gas hole; the flow area ratio of the circular hole in the wall surface of the natural gas beam 5 to the central gas groove of the natural gas impeller 6 is 1: 3.5, the non-uniform distribution of the natural gas in the same section after the natural gas enters the air passage of the mixer can be avoided.
In an embodiment, a wall surface diversion hedging type Venturi integrated mixer comprises a shell 1, an EGR core 2, a cross arm 3, a fixing pin 4, a natural gas beam 5, a natural gas impeller 6 and a natural gas straight-through joint 7, wherein the EGR core 2, the natural gas beam 5 and the natural gas impeller 6 are sequentially and fixedly arranged in the shell 1 along an air passage direction, the EGR core 2 is fixed with the shell 1 through friction welding, and the welding position is on a circle of annular surface where the EGR core 2 is contacted with the shell 1, so that the fixing effect and the sealing effect can be achieved, and a Venturi structure is formed in the EGR core 2; the natural gas beam 5 and the natural gas impeller 6 are fixed by friction welding and then fixed with the shell 1 as a whole by friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted, so that the fixing effect and the sealing effect can be achieved; the four support arms of the cross arm 3 are mutually positioned, the middle part of the cross arm 3 is oriented by a fixing pin, the outer side of the cross arm 3 is fixed with the EGR core 22 by spot welding, the thick end of the cross arm 3 is arranged in front, and the thin end is arranged behind; the cross arm central air hole 31 is arranged on an inclined plane which is transited from a thick end to a thin end, and natural gas and air are promoted to be mixed by means of a formed negative pressure area; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole 31 on an EGR core 2 in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core 2, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate 8 is additionally arranged at the flaring position of the Venturi structure in the EGR core 2, so that gas is subjected to primary rotary mixing; the natural gas loops through 5 wall round holes in the natural gas crossbeam and 6 central gas grooves in the natural gas impeller and then enters the air flue to be mixed with the mixed gas of the primary rotation for the secondary rotation, the primary rotation is mixed with the secondary rotation in the opposite direction, the mixed gas of the primary rotation is mixed by the reverse turbulent flow of the natural gas impeller 6, the mixing is promoted by utilizing the opposite impact, the rotating airflow is formed at the same time, and the mixing uniformity is further improved in the subsequent pipeline. The aperture of the EGR core 2 at the cross arm 3 along the two ends of the air passage is gradually increased, the transition of the large diameter and the small diameter is completed by the EGR core 2 by means of the circular arc, the gas resistance is reduced, and the gas flow field is more stable; the end part of the fixing pin 4 is conical, so that the pressure loss is reduced. The rear end face of the natural gas beam 5 and the front end face of the natural gas impeller 6 are both provided with a groove with a square cross section, the natural gas beam and the groove are jointed to form a small gas passage, so that one part of the 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 the natural gas directly enters the gas passage of the mixer through a wall surface gas hole; the flow area ratio of the circular hole in the wall surface of the natural gas beam 5 to the central gas groove of the natural gas impeller 6 is 1: 3.5, the non-uniform distribution of the natural gas in the same section after the natural gas enters the air passage of the mixer can be avoided. The natural gas impeller 6 adopts streamline blades, and the windward side air groove of the natural gas impeller 6 adopts a trapezoidal structure with a narrow outer part and a wide inner part.
The test results show that:
mixing uniformity: 98.85% of EGR waste gas and 91.11% of natural gas;
pressure resistance: EGR exhaust 11.1kpa, natural gas 3.8 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 wall water conservancy diversion hedging formula venturi integrated mixer which characterized in that: the EGR core, the natural gas beam and the natural gas impeller are sequentially and fixedly arranged in the shell along the direction of an air passage, and a Venturi structure is formed in the EGR core; the natural gas cross beam and the natural gas impeller are fixed together and then fixed with the shell as a whole; the cross arm is fixedly arranged in the middle of the EGR core along the air passage direction through a fixing pin; air enters an air passage from an inlet, EGR waste gas enters the air passage to be mixed with the air after passing through a wall surface round hole and a cross arm central air hole on the EGR core in sequence, the flow rate of the gas is improved by means of a Venturi structure formed in the EGR core, and the mixing is promoted by the relationship between the flow rate and the pressure; a wall guide plate is additionally arranged at the flaring position of the Venturi structure in the EGR core, so that gas is subjected to primary rotary mixing; the natural gas loops through get into the air flue behind natural gas crossbeam wall round hole and the central gas groove of natural gas impeller and mix with the rotatory mixture of mist secondary, the rotation direction that the rotatory mixture of one time is mixed with the rotatory mixture of secondary is opposite, and the mist that the rotatory mixture of one time passes through the reverse vortex of natural gas impeller, utilizes the offset to promote to mix, has formed rotatory air current simultaneously, further promotes the homogeneity of mixing at follow-up pipeline.
2. The walled-guide opposed-impulse venturi integrated mixer of claim 1, wherein: and the EGR core is welded and fixed with the shell.
3. The walled-guide opposed-impulse venturi integrated mixer of claim 2, wherein: the EGR core is fixed with the shell through friction welding, and the welding position is on a circle of annular surface where the EGR core is contacted with the shell.
4. The walled-guide opposed-impulse venturi integrated mixer of claim 1, wherein: the natural gas crossbeam and the natural gas impeller are fixed through friction welding and fixed with the shell as a whole after being fixed through friction welding, and the welding position is on a circle of annular surface where the natural gas impeller and the shell are contacted.
5. The walled-guide opposed-impulse venturi integrated mixer of claim 1, wherein: the four support arms of the cross arm are mutually positioned, the cross arm) is oriented by a fixing pin in the middle, and the outer side of the cross arm is fixed with the EGR core through spot welding.
6. The walled-guide opposed-impulse venturi integrated mixer of claim 5, wherein: the thick end of the cross arm is in front, and the thin end is in back; the central air hole of the cross arm is arranged on an inclined plane which is transited from the thick end to the thin end, and natural gas and air are promoted to be mixed by means of a formed negative pressure area.
7. The walled-guide opposed-impulse venturi integrated mixer of claim 1, wherein: the EGR core is gradually increased along the aperture at the two ends of the air passage at the cross arm.
8. The walled-guide opposed-impulse venturi integrated mixer of claim 1, wherein: the end of the fixing pin is conical.
9. The walled-guide opposed-impulse venturi integrated mixer of claim 1, wherein: a groove with a square cross section is machined in each of the rear end face of the natural gas beam and the front end face of the natural gas impeller, and the natural gas beam and the natural gas impeller are jointed to form a small gas passage, so that 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 gas holes in the wall surface; the flow area ratio of the circular hole in the wall surface of the natural gas beam to the central gas groove of the natural gas impeller is 1: 3.5.
10. the walled-guide opposed-impulse venturi integrated mixer of claim 1, wherein: the natural gas impeller adopts streamline blades, and the windward side air groove of the natural gas impeller adopts a trapezoidal structure with a narrow outer part and a wide inner part.
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