CN113374603A - Integrated supercharger air inlet connecting pipe structure - Google Patents

Integrated supercharger air inlet connecting pipe structure Download PDF

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Publication number
CN113374603A
CN113374603A CN202110680251.9A CN202110680251A CN113374603A CN 113374603 A CN113374603 A CN 113374603A CN 202110680251 A CN202110680251 A CN 202110680251A CN 113374603 A CN113374603 A CN 113374603A
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CN
China
Prior art keywords
pipe
port
central axis
air inlet
surge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110680251.9A
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Chinese (zh)
Inventor
李湘华
卢祥林
谭言旺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangxi Yuchai Machinery Co Ltd
Original Assignee
Guangxi Yuchai Machinery Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangxi Yuchai Machinery Co Ltd filed Critical Guangxi Yuchai Machinery Co Ltd
Priority to CN202110680251.9A priority Critical patent/CN113374603A/en
Publication of CN113374603A publication Critical patent/CN113374603A/en
Pending legal-status Critical Current

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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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • 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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10295—Damping means, e.g. tranquillising chamber to dampen air oscillations

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Supercharger (AREA)

Abstract

The invention discloses an integrated supercharger air inlet connecting pipe structure, which comprises a pipeline main body, a curved opening and an anti-surge opening; the pipeline main body is of a 90-degree bent angle structure and comprises an air inlet and an air outlet; the curved through hole is arranged at the downstream of an inner angle of the curved structure of the pipeline main body, and the central axis of the curved through hole is vertical to the plane where the central axis of the pipeline main body is located; the anti-surge port is arranged at the outer corner of the bent angle structure of the pipeline main body, and the central axis of the anti-surge port is coaxial with the central axis of the air inlet; the air inlet is communicated with the air filter, the air outlet is communicated with the air inlet of the supercharger compressor, the crank opening is communicated with a ventilation pipeline of the crankcase, and the anti-surge opening is communicated with a pipeline of the anti-surge valve. According to the integrated supercharger air inlet connecting pipe structure, the curved opening does not need to be inserted into the inclined opening pipe to enter the pipeline main body, the flow cross section area of the main air inlet pipeline cannot be reduced, and the air inlet amount in the heavy load process can be guaranteed.

Description

Integrated supercharger air inlet connecting pipe structure
Technical Field
The invention relates to the field of manufacturing of internal combustion engines, in particular to an integrated supercharger air inlet connecting pipe structure integrating a crankcase ventilation interface and an anti-surge interface.
Background
The existing national six-gas engine intake and exhaust system model is generally shown in fig. 1. Fresh air (generally commonly known as 'fresh air') enters a supercharger compressor after being subjected to air filtration and an air inlet connecting pipe to be changed into high-temperature and high-pressure gas, the temperature of the gas is reduced after passing through an intercooler, the gas enters a combustion chamber through an air inlet pipe and is subjected to combustion reaction with fuel in the combustion chamber, most of the gas (generally commonly known as 'waste gas') generated after combustion reaches a supercharger turbine through an exhaust pipe, a turbine is driven to rotate to do work on the gas compressor, and finally the gas is exhausted into the atmosphere through a post-processor; and the other small part (about 0.7-1.0%) of waste gas leaks into an engine crankcase through gaps among the piston, the piston ring and the cylinder hole, and then enters an air inlet connecting pipe in front of the supercharger compressor after passing through an oil-gas separator of a closed crankcase ventilation system. In addition, because the six gas engines in China adopt equivalent combustion, the amount of gas required to enter the cylinder is small when the load is small, and the problem of supercharger surge can occur. In order to avoid the surge problem, an anti-surge pipeline is generally arranged between a supercharged air inlet pipe and an air inlet connecting pipe in front of a supercharger, and whether the pipeline is communicated or not is controlled by an anti-surge valve. When the anti-surge valve is opened, the pressurized air enters the air inlet connecting pipe of the supercharger through the anti-surge valve and the connecting pipeline thereof, and under the condition of unreasonable arrangement (such as the first three ways in FIG. 2), high-pressure air enters the pipeline of the crankcase ventilation system, so that the crankcase pressure violates the regulation requirement (the GB 17691 and 2018 national emission Standard of heavy vehicles requires that C.5.11 measures the crankcase emission of the ignition engine, the crankcase pressure is measured at a proper position in the whole test process, the pressure measurement precision is within +/-1 kPa, and the crankcase pressure is not more than the atmospheric pressure, namely the crankcase pressure of the gas engine needs to be kept at negative pressure). The prior art arrangement that meets regulatory requirements, such as the last approach in fig. 2 (commonly known as "prior art"), has two major problems: firstly, the distance between the mouth of the anti-surge valve and the mouth of the crankcase ventilation system is large (generally, L is more than 200mm), the requirement on arrangement space is large, and the matching with the whole vehicle is inconvenient; and secondly, the pipeline of the crankcase ventilation system is designed with a diagonal cut to be inserted into the main air inlet pipeline, so that the flow cross section of the air inlet pipeline is greatly reduced, the air inlet flow resistance is large, and the air inlet amount is insufficient under the condition of large load.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide an integrated supercharger air inlet connecting pipe structure, wherein a curved opening of the integrated supercharger air inlet connecting pipe structure does not need to be inserted into a pipeline main body in a chamfered opening pipe mode, the flow cross section area of a main air inlet pipeline cannot be reduced, and the air inlet amount in heavy load can be ensured.
In order to achieve the purpose, the invention provides an integrated supercharger air inlet connecting pipe structure, which comprises a pipeline main body, a curved opening and an anti-surge opening; the pipeline main body is of a 90-degree bent angle structure and comprises an air inlet and an air outlet; the curved through hole is arranged at the downstream of an inner angle of the curved structure of the pipeline main body, and the central axis of the curved through hole is vertical to the plane where the central axis of the pipeline main body is located; the anti-surge port is arranged at the outer corner of the bent angle structure of the pipeline main body, and the central axis of the anti-surge port is coaxial with the central axis of the air inlet; the air inlet is communicated with the air filter, the air outlet is communicated with the air inlet of the supercharger compressor, the crank opening is communicated with a ventilation pipeline of the crankcase, and the anti-surge opening is communicated with a pipeline of the anti-surge valve.
In a preferred embodiment, the distance between the central axis of the curved through hole and the central axis of the air outlet pipe is not greater than the outer radius of the pipeline main body, and the distance between the central axis of the curved through hole and the central axis of the air inlet pipe is not less than the sum of the outer radius of the pipeline main body and the radius of the curved through hole.
In a preferred embodiment, the pipe diameter of the curved port and the anti-surge port is between 40% and 60% of the pipe inner diameter of the pipe body.
In a preferred embodiment, the pipe diameters of the curved opening and the surge protection opening are the same.
In a preferred embodiment, the pipe diameters of the curved opening and the surge protection opening are different.
In a preferred embodiment, the pipeline of the air inlet of the pipeline main body is in arc connection transition with the pipeline of the air outlet.
In a preferred embodiment, the distance between the central axis of the curved opening and the central axis of the air outlet pipe is between 80% and 100% of the outer circle radius of the pipeline main body, and the distance between the central axis of the curved opening and the central axis of the air inlet pipe is between 140% and 170% of the outer circle radius of the pipeline main body.
In a preferred embodiment, the duct body is integrally formed with the air inlet, the air outlet, the labyrinth opening and the surge preventing opening.
Compared with the prior art, the integrated supercharger air inlet connecting pipe structure has the following beneficial effects: the pipeline body from the air inlet to the air outlet is designed into a bent pipe structure, the curved port is arranged at the lower stream of the turning position and close to the inner side, the air inlet direction of the curved port is vertical to the plane of the pipeline body, the anti-surge port is arranged at the outer side of the turning position and is coaxial with the axial lead of the air inlet but opposite to the axial lead of the air inlet, the curved port does not need to enter the pipeline body in a mode of being inserted into a diagonal port pipe, the flow cross section of a main air inlet pipeline cannot be reduced, and the air inlet amount in the case of large load can be ensured; and has the advantages of simple structure, convenient processing, low cost, high reliability, compact structure, small space required by arrangement, convenient matching and the like.
Drawings
FIG. 1 is a schematic view of a gas engine supercharger intake nozzle arrangement according to one embodiment of the prior art;
FIG. 2 is a schematic view of a gas inlet connection of a gas engine supercharger according to one embodiment of the prior art;
FIG. 3 is a schematic perspective view of an integrated supercharger intake adapter structure according to an embodiment of the present invention;
FIG. 4 is a schematic front view of an integrated supercharger intake adapter structure according to an embodiment of the present invention;
FIG. 5 is a schematic left side view of an integrated supercharger intake adapter structure according to an embodiment of the present invention;
FIG. 6 is a schematic top view of an integrated supercharger intake adapter structure according to an embodiment of the present invention;
FIGS. 7 a-7 b are schematic diagrams of pipeline center profile pressure and velocity profile slices with the anti-surge valve of the integrated supercharger intake nozzle structure closed, according to an embodiment of the present invention;
fig. 8a to 8b are sectional views illustrating pressure and velocity distribution at the center of a pipeline when an anti-surge valve of an integrated type supercharger intake adapter structure is opened according to an embodiment of the present invention.
Description of the main reference numerals:
1-air inlet, 2-air outlet, 3-curved opening and 4-surge-proof opening.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 3 to 6, an integrated type supercharger intake connection pipe structure according to a preferred embodiment of the present invention includes a pipe body, a curved port 3, and an anti-surge port 4. The pipeline main part is 90 bent angle structures, and the pipeline main part includes air inlet 1 and gas outlet 2. Bent opening 3 sets up at the interior angle low reaches of the bent angle structure of pipeline main part, and the axis of bent opening 3 is perpendicular with the axis place plane of pipeline main part. The anti-surge opening 4 is arranged at the outer corner of the bent angle structure of the pipeline main body, and the central axis of the anti-surge opening 4 is coaxial with the central axis of the air inlet 1. Wherein the air inlet 1 is used for communicating with an air filter, the air outlet 2 is used for communicating with an air inlet of a supercharger compressor, the crank opening 3 is used for communicating with a ventilation pipeline of a crankcase, and the anti-surge opening 4 is used for communicating with a pipeline of an anti-surge valve.
In some embodiments, the pipe body does not necessarily have to adopt a 90 ° angle structure, and may be selected between 90 ° and 120 ° according to actual arrangement requirements, but a 90 ° angle structure is preferred.
In some embodiments, a distance Y between a central axis of the curved opening 3 and a central axis of the air outlet pipe is not greater than or close to a pipeline outer circle radius of the pipeline main body, and a distance X between the central axis of the curved opening 3 and the central axis of the air inlet pipe can be slightly greater than a sum of the pipeline outer circle radius of the pipeline main body and the radius of the curved opening, so that the curved opening 3 is deviated to one side of the air outlet 2 of the pipeline main body, namely, the curved opening 3 is ensured to be only partially communicated with the air outlet 2 of the pipeline main body. The distance Y between the central axis of the curved opening 3 and the central axis of the air outlet pipe is approximately between 80% and 100% of the outer circle radius of the pipeline main body, and the distance Y between the central axis of the curved opening 3 and the central axis of the air inlet pipe is approximately between 140% and 170% of the outer circle radius of the pipeline main body.
In some embodiments, the pipe diameter of the bellmouth 3 and the antisurge port 4 is between 40% and 60% of the pipe inner diameter of the pipe body.
In some embodiments, the diameters of the pipes of the crank port 3 and the anti-surge port 4 can be the same or different, and can be adjusted within a certain range according to the requirements of different models.
In some embodiments, the pipe of the air inlet 1 and the pipe of the air outlet 2 of the pipe body are in arc connection transition. Therefore, the passing air flow in the pipeline main body can be ensured to be smoother.
In some embodiments, the duct body is integrally formed with the inlet 1, outlet 2, elbow 3, and anti-surge port 4, such as, but not limited to, casting or welding with a refractory material.
In some embodiments, the integrated supercharger intake adapter structure of the present invention operates on the following principles:
as shown in fig. 7a to 7b, when the anti-surge valve is closed, the anti-surge port 4 has no flow. Fresh air flows in from the air inlet 1 and flows to the air outlet 2 through the pipeline main body, and at the moment, the pressure of the bent through port 3 is lower due to the fact that the bent through port is located in a flowing leeward area; the gas in the crankcase can smoothly flow to the supercharger air inlet connecting pipe through the crankcase ventilation pipeline, and the pressure in the crankcase is kept to meet the regulation requirement (lower than the atmospheric pressure).
As shown in fig. 8a to 8b, when the anti-surge valve is opened, a part of air flows into the supercharger intake connection through the anti-surge port 4. Fresh air flows in from the air inlet 1, the gas flows in the opposite direction to the gas from the anti-surge opening 4, the pressure at the upstream of the turning part is high, the pressure at the downstream part after the main pipe turns is low, a obvious high-low pressure boundary line is formed between the upstream and the downstream, the pressure of the curved opening 3 is low due to the arrangement at the downstream, the normal discharge of the gas in the crankcase is not prevented, and the pressure in the crankcase is kept to meet the regulation requirement (lower than the atmospheric pressure).
In summary, the integrated supercharger intake pipe structure of the present invention has the following advantages: the pipeline body from the air inlet to the air outlet is designed into a bent pipe structure, the curved port is arranged at the lower stream of the turning position and close to the inner side, the air inlet direction of the curved port is vertical to the plane of the pipeline body, the anti-surge port is arranged at the outer side of the turning position and is coaxial with the axial lead of the air inlet but opposite to the axial lead of the air inlet, the curved port does not need to enter the pipeline body in a mode of being inserted into a diagonal port pipe, the flow cross section of a main air inlet pipeline cannot be reduced, and the air inlet amount in the case of large load can be ensured; and has the advantages of simple structure, convenient processing, low cost, high reliability, compact structure, small space required by arrangement, convenient matching and the like.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (8)

1. An integrated supercharger intake pipe structure, comprising:
the pipeline main body is of a 90-degree bent angle structure and comprises an air inlet and an air outlet;
the curved through hole is arranged at the downstream of an inner angle of the bent angle structure of the pipeline main body, and the central axis of the curved through hole is vertical to the plane of the central axis of the pipeline main body; and
the anti-surge opening is arranged at the outer corner of the bent angle structure of the pipeline main body, and the central axis of the anti-surge opening is coaxial with the central axis of the air inlet;
wherein, the air inlet is used for with air cleaner UNICOM, the gas outlet is used for with the air inlet UNICOM of booster compressor, the bent opening is used for the ventilation pipeline UNICOM with the crankcase, the anti-surge mouth is used for the pipeline UNICOM with the anti-surge valve.
2. The integrated supercharger intake connection pipe structure according to claim 1, wherein a distance between a central axis of the curved port and a central axis of the outlet pipe is not greater than an outer radius of the pipe main body, and a distance between the central axis of the curved port and a central axis of the inlet pipe is not less than a sum of the outer radius of the pipe main body and a radius of the curved port.
3. The integrated supercharger intake nozzle structure of claim 1, wherein the pipe diameter of the curved port and the anti-surge port is between 40% and 60% of the pipe inner diameter of the pipe body.
4. The integrated supercharger intake nozzle structure of claim 1, wherein the pipe diameters of the labyrinth port and the anti-surge port are the same.
5. The integrated supercharger intake nozzle structure of claim 1, wherein the curved port and the anti-surge port have different conduit diameters.
6. The integrated supercharger intake pipe connection structure according to claim 1, wherein the pipe of the intake port of the pipe body and the pipe of the exhaust port of the pipe body are in arc-shaped engagement transition.
7. The integrated supercharger intake connection pipe structure according to claim 2, wherein a distance between the central axis of the curved port and the central axis of the outlet pipe is between 80% and 100% of the outer circumferential radius of the pipe body, and a distance between the central axis of the curved port and the central axis of the inlet pipe is between 140% and 170% of the outer circumferential radius of the pipe body.
8. The integrated supercharger intake nozzle structure of claim 1, wherein the duct body is integrally formed with the intake port, the exhaust port, the labyrinth port, and the surge port.
CN202110680251.9A 2021-06-18 2021-06-18 Integrated supercharger air inlet connecting pipe structure Pending CN113374603A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110680251.9A CN113374603A (en) 2021-06-18 2021-06-18 Integrated supercharger air inlet connecting pipe structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110680251.9A CN113374603A (en) 2021-06-18 2021-06-18 Integrated supercharger air inlet connecting pipe structure

Publications (1)

Publication Number Publication Date
CN113374603A true CN113374603A (en) 2021-09-10

Family

ID=77577774

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110680251.9A Pending CN113374603A (en) 2021-06-18 2021-06-18 Integrated supercharger air inlet connecting pipe structure

Country Status (1)

Country Link
CN (1) CN113374603A (en)

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