CN113062817A - Multi-channel gas mixer - Google Patents
Multi-channel gas mixer Download PDFInfo
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- CN113062817A CN113062817A CN202110422471.1A CN202110422471A CN113062817A CN 113062817 A CN113062817 A CN 113062817A CN 202110422471 A CN202110422471 A CN 202110422471A CN 113062817 A CN113062817 A CN 113062817A
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/04—Gas-air mixing apparatus
- F02M21/042—Mixer comprising a plurality of bores or flow passages
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
Abstract
The invention discloses a multi-channel gas mixer which is used for improving the gas mixing uniformity and reducing the pressure loss of an inlet and an outlet of the mixer. The method comprises the following steps: the gas inlet is communicated with the channel; the spray pipe is provided with at least three first sub-channels; the first sub-channel and the second sub-channel which correspond to each other in each pair are matched to form a premixing cavity, the first sub-channel of each premixing cavity is provided with an air inlet and a natural gas inlet, and a waste gas inlet is formed at the matching position of the first sub-channel and the second sub-channel.
Description
Technical Field
The invention relates to the technical field of waste gas recirculation systems, in particular to a multi-channel gas mixer.
Background
Exhaust Gas Recirculation (EGR) systems are an industry-recognized effective means of reducing the original emissions from an engine. As emission regulations escalate, demand for EGR rates is increasing, the key to which is how to achieve higher EGR. Meanwhile, for a natural gas engine, the mixing uniformity of natural gas with air and Exhaust Gas (EGR) is also important, and the mixing uniformity has a significant influence on the dynamic property, the economy, the emission property, the cycle variation and the like of the engine.
In a natural gas engine, the component that performs the gas mixing function is a gas mixer located behind the throttle valve and in front of the intake manifold. The gas mixer is required not only to satisfy the requirement of mixing uniformity of three gases (i.e., natural gas, air and exhaust gas), but also to reduce the pumping work of the engine by minimizing the flow resistance loss.
The existing mixer technology has the advantages of complex structure, high cost and large windward area in order to improve the mixing effect, so that the pressure loss of an inlet and an outlet of the mixer is increased. Some mixers cause the pressure loss at the inlet and the outlet of the mixer to increase along with the increase of the frontal area in order to increase the EGR rate. Therefore, the existing mixer technology is difficult to improve the gas mixing uniformity and reduce the pressure loss of the inlet and the outlet.
Disclosure of Invention
The invention provides a multi-channel gas mixer which is used for improving the gas mixing uniformity and reducing the pressure loss of an inlet and an outlet of the mixer.
The embodiment of the invention provides a multi-channel gas mixer, which comprises:
the gas inlet is communicated with the channel;
the spray pipe is provided with at least three first sub-channels;
the first sub-channel and the second sub-channel which correspond to each other in each pair are matched to form a premixing cavity, the first sub-channel of each premixing cavity is provided with an air inlet and a natural gas inlet, and a waste gas inlet is formed at the matching position of the first sub-channel and the second sub-channel.
The multichannel gas mixer that this embodiment provided mixes air, natural gas and waste gas through the premixing chamber that at least three first subchannel and the cooperation of the second subchannel that corresponds formed, owing to set up original single channel into a plurality of premixing chamber, to every premixing chamber, the gas flow cross-sectional area diminishes, and the area of facing wind diminishes when realizing the mixability, and the pressure loss can reduce by a wide margin in the blender exit.
As an alternative embodiment, the first and second sub-passages of the premix chamber are coaxial.
The first sub-channel and the second sub-channel in the premixing cavity in the embodiment are coaxial, so that the mixed gas in the first sub-channel can enter the second sub-channel to be mixed again, and the mixing uniformity can be improved better.
In an alternative embodiment, the end of the second sub-channel of the premix chamber close to the air inlet is flared and gradually becomes smaller from the end close to the air inlet to the end far away from the air inlet.
In the embodiment, one end of the second sub-channel, which is close to the air inlet, is in a horn shape, so that the matching position of the second sub-channel and the first sub-channel can form an exhaust gas inlet.
As an alternative embodiment, the joint of the first sub-passage and the second sub-passage is formed with an exhaust gas inlet, including:
one end of the first sub-channel, far away from the air inlet, of the premixing cavity is matched with one end of the second sub-channel, in a horn shape, to form an exhaust gas inlet, and the exhaust gas inlet gradually becomes smaller from the direction far away from the air inlet to the direction close to the air inlet.
The exhaust gas inlet in this embodiment is formed at the junction of the first sub-passage and the second sub-passage, and the air and the natural gas are mixed in the first sub-passage and then mixed with the exhaust gas in the second sub-passage.
In an alternative embodiment, the first sub-channel has a gradually decreasing cross-sectional area along the axial direction of the air inlet flow.
The channel sectional area of the first sub-channel in the embodiment is gradually reduced along the axial direction of the air entering flow, so that negative pressure is formed at the matching position of the spray pipe and the diffuser pipe by utilizing the Bernoulli principle, and the waste gas (EGR) entering from the waste gas inlet of the matching position in a circumferential mode is injected, so that the EGR rate can be increased.
As an alternative embodiment, the second sub-channel has a gradually increasing channel cross-sectional area along the axial direction of the air inlet flow.
The channel cross-sectional area of the second sub-channel in this embodiment is gradually increasing along the axial direction of the flow of the air entering, so that the speed energy obtained through the nozzle is gradually converted into pressure energy by using the bernoulli principle, and simultaneously, the air, the natural gas and the Exhaust Gas (EGR) are further uniformly mixed in the second sub-channel.
As an alternative embodiment, the circumferential wall of the nozzle is provided with a plurality of natural gas inlet small holes to form the natural gas inlet.
In this embodiment, because the total amount of natural gas is less than the air, in order to improve the homogeneity of mixing, can be equipped with evenly distributed's natural gas inlet aperture at the perisporium of spray tube to make the natural gas mix with the air in first subchannel through the mode that the circumference got into, improve the homogeneity of mixing.
As an optional embodiment, the housing is further provided with a natural gas inlet, the natural gas inlet is connected with a peripheral wall of the spray pipe, and the peripheral wall is formed with an annular cavity, so that natural gas enters the annular cavity and enters the first sub-channel through a natural gas inlet small hole in the peripheral wall.
The natural gas in this embodiment enters the annular cavity of the peripheral wall of the spray pipe through the natural gas inlet on the shell, and enters the first sub-channel through the natural gas inlet small hole on the peripheral wall, so that the natural gas is mixed with air in the first sub-channel in a circumferential entering manner, and the mixing uniformity is improved.
As an optional implementation, the method further includes:
the premixing cavities are merged into a mixing cavity at one end far away from the air inlet.
One end of the premixing cavity far away from the air inlet is fused with all the premixing cavities into a mixing cavity, so that the local resistance loss of the multi-channel converged single-channel outlet is reduced, and the improvement of the mixing uniformity of mixed gas is facilitated.
As an alternative embodiment, the respective premix chambers are interconnected internally by communication holes.
In order to ensure that the pressure at the waste gas inlet of each premixing cavity is the same, each premixing cavity is internally connected with each other through a communication hole, and the mixing uniformity is further improved.
The multi-channel gas mixer provided by the embodiment of the invention can meet the requirement of mixing uniformity of air, natural gas and waste gas, and changes a plurality of single flow channels of the mixer, so that the flow cross-sectional area of each flow channel is reduced, and a good mixing effect can be realized only by adopting a simple circumferential introduction mode without using a complicated natural gas and EGR introduction tube shape; meanwhile, due to the fact that the complex natural gas and EGR introducing pipes are removed, the windward area is reduced, and the pressure loss of the inlet and the outlet of the mixer can be greatly reduced.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is an exploded view of a multi-channel gas mixer according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of one third of a multi-channel gas mixer according to an embodiment of the present invention;
fig. 3 is a sectional view of a communication hole provided in an embodiment of the present invention;
FIG. 4 is a schematic axial view of a diffuser of a multi-channel gas mixer according to an embodiment of the present invention;
FIG. 5 is an exploded view of the components of a multi-channel gas mixer according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a nozzle according to an embodiment of the present invention;
FIG. 7 is a schematic view of a mating portion of a first sub-channel and a second sub-channel provided by an embodiment of the present invention;
fig. 8 is a schematic cross-sectional structural diagram of a second sub-channel provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. 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.
The term "and/or" in the embodiments of the present invention describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The application scenario described in the embodiment of the present invention is for more clearly illustrating the technical solution of the embodiment of the present invention, and does not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by a person skilled in the art that with the occurrence of a new application scenario, the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems. In the description of the present invention, the term "plurality" means two or more unless otherwise specified.
In the existing mixer technology, generally, natural gas and EGR injection pipes are inserted along the air circulation direction, and the natural gas and the EGR are respectively introduced into a channel in a mixer core body to be mixed with air. In order to improve the mixing effect, the natural gas and EGR nozzle shapes are made extremely complicated, and even a turbulent flow structure is added, so that the structure is complicated, the cost is high, the windward area is increased, and the pressure loss of an inlet and an outlet of the mixer is increased. In addition, some mixer cores have a throat feature at the EGR introduction location to increase the flow rate and decrease the static pressure of the air at the EGR introduction location using bernoulli's principle, thereby increasing the EGR rate. But after the velocity of flow increases, it is more sensitive to the frontal area, and the ratio that blender exit pressure loss increases along with the frontal area promotes by a wide margin than the meeting of non-throat structure. Therefore, the existing mixer technology is difficult to improve the mixing uniformity and reduce the pressure loss of the inlet and the outlet.
The existing mixer technology is to mix air, natural gas and EGR in a flow channel, and because of the large flow cross-sectional area, only complicated shapes of natural gas and EGR introducing pipes can be used for realizing better mixing uniformity. The core idea of the embodiment of the invention is that a plurality of single flow channels of the mixer are changed, so that the flow cross-sectional area of each flow channel is reduced, and a good mixing effect can be realized only by adopting a simple circumferential introduction mode without using a complicated natural gas and EGR introduction tube shape; meanwhile, the complex natural gas and EGR introducing pipes are removed, the windward area is reduced, and the pressure loss of the inlet and the outlet of the mixer can be greatly reduced.
As shown in fig. 1 and 2, the core structure of a multi-channel gas mixer provided by the present example is described as follows, and the multi-channel gas mixer includes a housing 100, a nozzle 101, and a diffuser pipe 102, wherein:
a housing 100, a channel 103 formed in the housing 100, the housing 100 being provided with a gas inlet 104 communicating with the channel 103;
a nozzle 101, said nozzle 101 being provided with at least three first sub-channels 105;
the diffuser pipe 102 is provided with second sub-passages 106 corresponding to the first sub-passages 105 one by one, each pair of the corresponding first sub-passages 105 and second sub-passages 106 are matched to form a premixing cavity 107, the first sub-passage 105 of each premixing cavity 107 is provided with an air inlet 108 and a natural gas inlet 109, and a waste gas inlet 110 is formed at the matching position of the first sub-passage 105 and the second sub-passage 106.
The multichannel gas mixer that this embodiment provided mixes air, natural gas and waste gas through the premixing chamber 107 that at least three first subchannel 105 and the cooperation of the second subchannel 106 that corresponds formed, because set up original single channel into a plurality of premixing chamber 107, to every premixing chamber 107, the gas flow cross-sectional area diminishes, and the windward area diminishes when realizing the mixability, and the pressure loss can reduce by a wide margin in the blender import and export.
Optionally, the first sub-passage 105 and the second sub-passage 106 of the premix chamber 107 are coaxial.
The first sub-channel 105 and the second sub-channel 106 in the premix chamber 107 in this embodiment are coaxial, so that the mixed gas in the first sub-channel 105 can enter the second sub-channel 106 to be mixed again, and the mixing uniformity can be improved better.
In the embodiment, as shown in fig. 2, a schematic diagram of inlets of air, natural gas and exhaust gas is provided, wherein a plurality of natural gas inlet holes are formed on a peripheral wall of the nozzle 101 to form the natural gas inlet 109. The shell 100 is further provided with a natural gas inlet 201, the natural gas inlet 201 is connected with a peripheral wall of the spray pipe 101, and an annular cavity 202 is formed in the peripheral wall, so that natural gas enters the annular cavity 202 and enters the first sub-channel 105 through natural gas inlet small holes in the peripheral wall. In operation, natural gas enters each first sub-passage 105 in a circumferentially porous manner through the annulus 202 at the conical surface of the first sub-passage 105.
In this embodiment, since the total amount of the natural gas is smaller than that of the air, in order to improve the mixing uniformity, the natural gas inlet holes uniformly distributed may be formed in the peripheral wall of the nozzle 101, so that the natural gas is mixed with the air in the first sub-passage 105 in a circumferential entering manner, and the mixing uniformity is improved. The natural gas in this embodiment enters the annular cavity of the peripheral wall of the nozzle 101 through the natural gas inlet 201 on the housing 100, and enters the first sub-channel 105 through the natural gas inlet small hole on the peripheral wall, so that the natural gas is mixed with the air in the first sub-channel 105 in a circumferential entering manner, and the mixing uniformity is improved.
An exhaust gas inlet 110 is formed at the junction of the first sub-passage 105 and the second sub-passage 106. Optionally, an end of the second sub-passage 106 of the premix chamber 107 near the air inlet 108 is flared, and gradually becomes smaller from the end near the air inlet 108 to the end far from the air inlet 108. The end of the first sub-channel 105 far from the air inlet 108 of the premix chamber 107 and the flared end of the second sub-channel 106 cooperate to form an exhaust gas inlet 110, which is gradually reduced from the direction far from the air inlet 108 to the direction close to the air inlet 108. The second sub-passage 106 in this embodiment is flared at its end near the air inlet 108, ensuring that the mating of the second sub-passage 106 and the first sub-passage 105 forms the exhaust inlet 110. The exhaust gas inlet 110 in this embodiment is formed at the junction of the first sub-passage and the second sub-passage, and the air and the natural gas are mixed in the first sub-passage 105 and then mixed with the exhaust gas in the second sub-passage 106. Mixing uniformity and EGR rate are improved.
In the present embodiment, in order to improve the EGR rate by using the bernoulli principle, the first sub-passage 105 is provided with a gradually decreasing channel cross-sectional area along the axial direction of the air entering flow, so that according to the bernoulli principle, that is, the smaller the cross-sectional area, the smaller the pressure, the matching position of the second sub-passage 106 and the first sub-passage 105, that is, the end of the second sub-passage 106 close to the air inlet 108 is trumpet-shaped, and the cross-sectional area of the trumpet-shaped position of the second sub-passage 106 is larger than the smallest cross-sectional area of the first sub-passage 105, that is, a negative pressure is formed at the matching position of the first sub-passage 105 and the second sub-passage 106, that is, a negative pressure is formed at the exhaust gas inlet 110, so that the exhaust gas enters the premixing cavity 107.
In the present embodiment, the cross-sectional area of the first sub-passage 105 is gradually reduced along the axial direction of the air entering flow, so that a negative pressure is formed at the matching position of the nozzle 101 and the diffuser pipe 102 by using the bernoulli principle, and the Exhaust Gas (EGR) entering from the exhaust gas inlet 110 at the matching position in a circumferential manner is injected, so that the EGR rate can be increased.
In order to improve the mixing uniformity, the second sub-channel 106 is provided with a gradually increasing channel cross-sectional area along the axial direction of the air entering flow. Therefore, the bernoulli principle is utilized, that is, the larger the cross-sectional area is, the larger the pressure is, that is, the larger the pressure potential energy is, the smaller the kinetic energy is, that is, the lower the gas flowing speed is, so that the exhaust gas, the air and the natural gas are further uniformly mixed in the second sub-channel 106, and the mixing uniformity is improved.
The channel sectional area of the second sub-channel 106 in this embodiment is gradually increased in the axial direction of the flow of the air entering, so that the velocity energy obtained by the nozzle 101 is gradually converted into pressure energy by using the bernoulli principle, and the air, the natural gas, and the Exhaust Gas (EGR) are further uniformly mixed in the second sub-channel 106.
In order to ensure that the pressure of each premix chamber 107 at the exhaust gas inlet 110 is the same among the plurality of premix chambers 107, the present embodiment internally interconnects the premix chambers 107 by a communication hole having a cross-sectional view as shown in fig. 3.
Alternatively, as shown in fig. 4, one end of each premix chamber 107 away from the air inlet 108 (i.e. the end of the mixed gas output) is merged into one mixing chamber 111, so as to reduce the local resistance loss of the single-channel outlet formed by merging multiple channels, in practice, at the end of each premix chamber 107 away from the air inlet 108, every two premix chambers intersect, and gradually merge together through a cambered surface, so as to reduce the local resistance loss of the single-channel outlet formed by merging multiple channels.
In the multi-channel gas mixer provided in the present embodiment, three first sub-channels 105 and three second sub-channels 106 are taken as an example for explanation, and as shown in fig. 5, a structural schematic diagram of each component of the multi-channel gas mixer is shown, three first sub-channels 105 in the nozzle 101 are uniformly distributed along a circumference, and are respectively coaxial with the corresponding second sub-channels 106 in the diffuser pipe 102, so as to form a pair of nozzle-diffuser pipe premixing cavities 107 on each axis. The shell 100 is provided with a natural gas inlet, a channel is formed in the shell 100, and a gas inlet 104 communicated with the channel is arranged. The nozzle 101 and diffuser pipe 102 are secured by the housing 100. In practice, the housing 100 is provided with a natural gas inlet 201 at the left side and is fixed with the nozzle 101, and is provided with a gas inlet 104 at the right side and is used for fixing the diffuser pipe 102. Wherein the gas inlet 104 is for waste gas entry.
As shown in fig. 6, the inside of the nozzle tube is schematically illustrated, a plurality of natural gas inlet holes are formed on the peripheral wall of the nozzle tube 101 to form the natural gas inlet 109, and an annular cavity 202 is formed on the peripheral wall of the nozzle tube 101, so that natural gas enters the annular cavity 202 and enters the first sub-channel 105 through the natural gas inlet holes on the peripheral wall. Air enters the first sub-channel 105 through an air inlet 108 arranged at the left side of the first sub-channel 105, natural gas enters an annular cavity 202 of the peripheral wall of the spray pipe 101 through a natural gas inlet 201 of the shell 100, and enters the first sub-channel 105 through natural gas inlet small holes uniformly distributed on the peripheral wall. The first sub-channel 105 has a gradually decreasing cross-sectional area along the axial direction of the air entering flow.
As shown in fig. 7, the second sub-passage 106 of the premix chamber 107 is flared at the end close to the air inlet 108, and gradually becomes smaller from the end close to the air inlet to the direction away from the air inlet, as shown in the schematic diagram of the matching position of the first sub-passage 105 and the second sub-passage 106. The end of the first sub-passage 105 far from the air inlet 108 and the flared end of the second sub-passage 106 of the premix chamber cooperate to form an exhaust gas inlet 110, which is gradually reduced from the direction far from the air inlet 108 to the direction close to the air inlet 108.
As shown in fig. 8, the internal structure of the second sub-passage 106 is schematically illustrated, and the cross-sectional area of the second sub-passage gradually increases along the axial direction of the flow of the air. And the adjacent second sub-channels are fused into a single channel through arc surfaces at one end far away from the air inlet, so that each second sub-channel 106 is fused into a single channel.
This embodiment can avoid complicated mixed structure in the current blender technique, introduces the mode through simple natural gas and EGR circumference, just can realize better mixed effect, and the frontal area is little, and the blender is imported and exported resistance loss and is little. Meanwhile, the EGR is injected by utilizing the Bernoulli principle, so that the EGR rate is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A multi-channel gas mixer, comprising:
the gas inlet is communicated with the channel;
the spray pipe is provided with at least three first sub-channels;
the first sub-channel and the second sub-channel which correspond to each other in each pair are matched to form a premixing cavity, the first sub-channel of each premixing cavity is provided with an air inlet and a natural gas inlet, and a waste gas inlet is formed at the matching position of the first sub-channel and the second sub-channel.
2. The mixer of claim 1, wherein the first and second sub-passages of the premix chamber are coaxial.
3. The mixer of claim 1 wherein the second sub-passageway of the premix chamber is flared at an end thereof proximate the air inlet and tapers from proximate the air inlet in a direction away from the air inlet.
4. The mixer of claim 3, wherein the mating of the first and second sub-passages is formed with an exhaust gas inlet comprising:
one end of the first sub-channel, far away from the air inlet, of the premixing cavity is matched with one end of the second sub-channel, in a horn shape, to form an exhaust gas inlet, and the exhaust gas inlet gradually becomes smaller from the direction far away from the air inlet to the direction close to the air inlet.
5. The mixer of claim 1 wherein the first sub-passageway has a decreasing tendency to have a decreasing cross-sectional area in the axial direction of the flow of the incoming air.
6. The mixer of claim 1 wherein the second sub-passageway has a gradually increasing trend of passageway cross-sectional area in the axial direction of flow of the incoming air.
7. The mixer of claim 1, wherein the nozzle has a plurality of natural gas inlet apertures in a peripheral wall thereof to form the natural gas inlet.
8. The mixer of claim 7 wherein the housing further includes a natural gas inlet port, the natural gas inlet port being connected to a peripheral wall of the nozzle, the peripheral wall defining an annular cavity such that natural gas enters the annular cavity and enters the first sub-passage through natural gas inlet apertures in the peripheral wall.
9. The mixer according to any one of claims 1 to 8, further comprising:
the premixing cavities are merged into a mixing cavity at one end far away from the air inlet.
10. A mixer according to any of claims 1 to 8, wherein the respective premix chambers are interconnected internally by communication holes.
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| CN202110422471.1A CN113062817A (en) | 2021-04-20 | 2021-04-20 | Multi-channel gas mixer |
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| CN202110422471.1A CN113062817A (en) | 2021-04-20 | 2021-04-20 | Multi-channel gas mixer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113944575A (en) * | 2021-12-20 | 2022-01-18 | 潍柴动力股份有限公司 | Mixer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944575A (en) * | 2021-12-20 | 2022-01-18 | 潍柴动力股份有限公司 | Mixer |
| CN113944575B (en) * | 2021-12-20 | 2022-07-19 | 潍柴动力股份有限公司 | Mixer |
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Application publication date: 20210702 |