CN113404568B - Integral intake valve, cylinder head and gas engine - Google Patents

Integral intake valve, cylinder head and gas engine Download PDF

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Publication number
CN113404568B
CN113404568B CN202110951793.5A CN202110951793A CN113404568B CN 113404568 B CN113404568 B CN 113404568B CN 202110951793 A CN202110951793 A CN 202110951793A CN 113404568 B CN113404568 B CN 113404568B
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China
Prior art keywords
intake valve
integral
throat
integrated
projection
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CN113404568A (en
Inventor
李卫
吕顺
王霞
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B31/00—Modifying induction systems for imparting a rotation to the charge in the cylinder
    • F02B31/04—Modifying induction systems for imparting a rotation to the charge in the cylinder by means within the induction channel, e.g. deflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4235—Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
    • 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
    • Y02T10/12—Improving ICE efficiencies
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The invention discloses an integral intake valve, a cylinder cover and a gas engine, which are applied to the gas engine reformed on the basis of a diesel engine, and the gas engine comprises an integral intake valve disc and at least two tappets which are connected with the integral intake valve disc and vertical to the bottom end surface of the integral intake valve disc, wherein the integral intake valve disc is matched with an integral intake valve seat ring at an integral intake throat formed on the cylinder cover to open and close so as to realize the on-off control of the integral intake valve, and the integral intake throat is simultaneously matched with a plurality of exhaust throats corresponding to the same combustion chamber. This integral intake valve, be equivalent to two intake valves joint design originally, form a complete intake valve disk portion, eliminated two interference that produce when the intake valve admits air completely, the intake air flow that effectively improves to it rolls the flow effect in the combustion chamber of the gas engine who develops to more help improving on the diesel engine's the basis.

Description

Integral intake valve, cylinder head and gas engine
Technical Field
The invention relates to the technical field of air inlet of engines, in particular to an integral type inlet valve, an air cylinder cover and a gas engine.
Background
With the development of gas engine technology, more and more gas engines are transformed on the basis of diesel engines at present. In the case of a diesel engine, the combustion mode is diffusion combustion, and a certain degree of swirl helps the oil bundles to mix with air, thereby improving the combustion process, so that an air inlet passage in the cylinder head of the engine is required to organize the air flow to generate a sufficient swirl ratio during the intake process. Wherein, the vortex refers to the gas rotational flow movement organized around the cylinder axial direction.
However, the combustion mode of the gas engine is premixed combustion, the requirement on the strength of vortex is not high, and small-scale turbulent motion is needed to form a flame wrinkle surface, so that the flame propagation speed is increased, and the heat efficiency is improved, wherein the turbulent motion refers to small rotational flow which is generated in a flow field when the air flow speed is high and has unfixed directions, and is different from laminar motion. For a gas engine, the strength of the vortex does not need to be increased, and the increase of the tumble strength in the cylinder can be beneficial to forming turbulence at the end of compression and generating enough turbulent kinetic energy when the piston moves up to the top dead center, so that the aim of optimizing combustion is fulfilled. Wherein, the tumble refers to the gas rotational flow motion of which the rotation central axis is vertical to the axial direction of the cylinder sleeve.
Therefore, for the existing gas engine cylinder cover which is designed by integrally modifying the diesel engine cylinder cover, tumble flow required by the gas engine is difficult to generate in the cylinder.
In summary, how to improve tumble effect in a combustion chamber of a developed gas engine on the basis of improving a diesel engine has become a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an integral type inlet valve, a cylinder cover and a gas engine, which are used for improving the tumble effect in a combustion chamber of a developed gas engine on the basis of improving a diesel engine.
In order to achieve the purpose, the invention provides an integral type intake valve which is applied to a gas engine reformed on the basis of a diesel engine, and the gas engine comprises an integral type intake valve disc and at least two tappets which are connected with the integral type intake valve disc and vertical to the bottom end face of the integral type intake valve disc, wherein the integral type intake valve disc is matched with an integral type intake valve seat ring at an integral type intake throat formed on a cylinder cover to be opened and closed so as to realize the on-off control of the integral type intake valve, and the integral type intake throat is matched with a plurality of exhaust throats corresponding to the same combustion chamber at the same time.
Preferably, the orthographic projection of the bottom end face of the integral type intake valve disc is in an oval shape, a kidney shape, a willow leaf shape or a shape formed by intersecting two circles.
Preferably, the top ends of any two of the lifters are the same distance from the bottom end face of the integrated intake valve disk.
Preferably, the number of the tappets is two.
Preferably, the top ends of at least two of the lifters are at different distances from the bottom end face of the integrated intake valve disk.
Preferably, a part of the edge of the bottom surface of the integral type intake valve disc protrudes downwards to form a flow blocking protruding part, and when the integral type intake valve is installed to an integral type intake throat of a cylinder cover, the flow blocking protruding part is positioned on one side close to the exhaust throat.
Preferably, the projection of the flow blocking convex part on the bottom surface of the integral type intake valve disc is an arc projection, the convex direction of the arc projection faces the outer side of the integral type intake valve disc, and the width of the middle part of the arc projection is larger than the width of the two ends of the arc projection.
Preferably, the arcuate projection is at least partially located inboard of a bottom end face of the unitary intake valve disc; or the arcuate projection is at least partially outside the bottom end face of the integral intake valve disk.
Preferably, the arc projection is arranged along the circumferential edge of the integral type intake valve disc, and the arc projection covers an angle theta in the circumferential direction of the integral type intake valve disc, and the relation is satisfied: theta is more than 0 and less than or equal to 240 degrees.
Preferably, the joint position of one surface of the flow blocking convex part facing the center of the integral type intake valve disc and the bottom end surface of the integral type intake valve disc is a smooth curved surface.
Preferably, the smooth curved surface is an inward concave arc-shaped surface formed by rounding off the connecting position.
Compare in background art introduction content, above-mentioned integral intake valve is applied to the gas engine that reforms transform on diesel engine's the basis and forms, including integral intake valve dish and connect in integral intake valve dish and perpendicular to the tappet of the bottom terminal surface of integral intake valve dish, the quantity of tappet is two at least, integral intake valve dish be used for with the cylinder cover on the integral intake valve seat circle cooperation switching of integral intake valve throat department of formation in order to realize the on-off control of integral intake valve, integral intake throat simultaneously with the exhaust throat phase-match of a plurality of that same combustion chamber corresponds. This integral (air) intake valve, be applied to on the cylinder head of engine, when the engine cylinder breathes in, integral (air) intake valve is opened, the air current gets into the cylinder through whole throat of admitting air, because integral throat of admitting air is simultaneously with the exhaust throat phase-match of a plurality of that same combustion chamber corresponds, the combustion chamber air intake in-process, there is not the mutual interference problem between the (air) intake valve, explain as an example with two traditional (air) intake valves, this application is equivalent to two (air) intake valve joint design originally, form a complete (air) intake valve dish portion, also be integral (air) intake valve, thereby can effectual control the direction of admitting air, the interference that produces when having eliminated two (air) intake valves simultaneously completely, the air inflow flow of effective improvement, thereby more help improving the tumble flow effect in the gas engine's of development on the basis.
In addition, the invention also provides a cylinder cover which comprises an integral type air inlet throat and a plurality of exhaust throats matched with the integral type air inlet throat, wherein an integral type air inlet valve seat ring and an integral type air inlet valve used for being matched with the integral type air inlet valve seat ring to open and close to realize the on-off control of air inlet are arranged in the integral type air inlet throat, and the integral type air inlet valve is the integral type air inlet valve described in any scheme. Since the integral intake valve has the technical effects, the cylinder head with the integral intake valve also has the corresponding technical effects, and the description is omitted.
Preferably, a tumble sharp corner is arranged on one side, far away from the exhaust throat, in the integral intake valve seat ring, the axial projection of the tumble sharp corner on the upper end face of the integral intake valve seat ring is a sharp corner projection, the sharp corner projection forms a protruding area protruding from the inner side edge of the integral intake valve seat ring to the center of the integral intake valve seat ring, and the width of the middle part of the sharp corner projection is greater than the widths of the two ends of the integral intake valve seat ring.
Preferably, the bottom hole of the integral air inlet throat is provided with an air inlet chamfer, and the center of the air inlet chamfer is offset by a preset distance relative to the center of the integral air inlet throat towards the direction of the exhaust throat.
In addition, the invention also provides a gas engine, which comprises a cylinder cover, wherein the cylinder cover is the cylinder cover described in any scheme, and the cylinder cover has the technical effects, so that the gas engine with the cylinder cover also has the corresponding technical effects, and the details are not repeated.
The invention has the following beneficial effects:
1) according to the scheme, the original two intake valves are jointly designed to form a complete intake valve disk part, so that the air intake direction can be effectively controlled, and the middle hedging air flow between the two intake valves is completely eliminated, so that the tumble motion is more easily organized;
2) compared with the traditional two air inlet channel structures which are separately arranged, the scheme can remove the cooling water jacket structure between the two air inlet channels, thereby enlarging the flow area of the air channel and enhancing the flow capacity;
3) because the explosion pressure of the gas engine is low, the wear of the intake valve is small, and therefore the integral intake valve which cannot rotate relative to the seat ring has higher feasibility in the gas engine.
Drawings
FIG. 1 is a schematic structural view of an integral intake valve provided in an embodiment of the invention;
FIG. 2 is a schematic top view of an integral intake valve provided in an embodiment of the present invention;
FIG. 3 is a schematic structural view of an integrated intake throat matching two exhaust throats on a cylinder head according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a conventional intake valve stem with a flow blocking protrusion of an integral intake valve disc;
FIG. 5 is a schematic structural diagram of a characteristic structure of a flow blocking convex part on an integral intake valve disc provided in the embodiment of the invention;
FIG. 6 is a schematic end view of an integrated intake valve disc and choke boss provided in an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of an integrated intake valve seat ring with a tumble sharp corner according to an embodiment of the present invention;
FIG. 8 is a schematic view of a second shape of an integral intake valve provided in the embodiment of the invention;
FIG. 9 is a schematic view showing a third shape of an integral intake valve provided in the embodiment of the invention;
fig. 10 is a schematic view showing a fourth shape of an integral intake valve provided in the embodiment of the invention.
In the context of figures 1-10 of the drawings,
the device comprises a tappet 1, an integral type intake valve disc 2, a flow choking bulge 3, an integral type intake throat 4, an integral type intake valve seat ring 5, an exhaust throat 6, a tumble sharp angle 7, an intake duct 8 and an exhaust duct 9.
Detailed Description
The core of the invention is to provide an integral intake valve, a cylinder cover and a gas engine, so as to improve the tumble effect in a combustion chamber of the developed gas engine on the basis of improving a diesel engine.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all 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 application.
As shown in fig. 1-3, an embodiment of the present invention provides an integral intake valve, which is applied to a gas engine reformed based on a diesel engine, and includes an integral intake valve disk 2 and tappets 1 connected to the integral intake valve disk 2 and perpendicular to a bottom end surface of the integral intake valve disk 2, where the number of the tappets 1 is at least two, the integral intake valve disk 2 is used for being opened and closed in cooperation with an integral intake valve seat ring 5 at an integral intake throat 4 formed on a cylinder cover to realize on-off control of the integral intake valve, and the integral intake throat 4 is simultaneously matched with a plurality of exhaust throats 6 corresponding to a same combustion chamber.
This integral (air) intake valve, be applied to on the cylinder head of engine, when the engine cylinder breathes in, integral (air) intake valve is opened, the air current gets into the cylinder through whole throat of admitting air, because integral throat of admitting air is simultaneously with the exhaust throat phase-match of a plurality of that same combustion chamber corresponds, the combustion chamber air intake in-process, there is not the mutual interference problem between the (air) intake valve, explain as an example with two traditional (air) intake valves, this application is equivalent to two (air) intake valve joint design originally, form a complete (air) intake valve dish portion, also be integral (air) intake valve, thereby can effectual control the direction of admitting air, the interference that produces when having eliminated two (air) intake valves simultaneously completely, the air inflow flow of effective improvement, thereby more help improving the tumble flow effect in the gas engine's of development on the basis.
It should be noted here that, since the integral intake valve is an integrated design of a plurality of conventional intake valves (for example, two intake valves), in order to make the airflow flow toward a plurality of exhaust throats matching with the integral intake valve, the orthographic projection of the bottom end face of the integral intake valve disk 2 of the integral intake valve is preferably designed to be non-perfect circular, for example, in a manner that the width of the middle part of the orthographic projection of the bottom end face of the integral intake valve disk 2 is larger than that of the two ends, an oval shape (as shown in fig. 2), a kidney shape, a willow leaf shape, or a shape formed by intersecting two circles may be specifically adopted. Referring to fig. 8 to 9, the outer contour shape of the integrated intake valve disk 2 in fig. 8 is a shape in which two circles arranged apart from each other are connected by a circular arc line, the outer contour shape of the integrated intake valve disk 2 in fig. 9 is a shape in which two circles arranged in an intersecting manner are formed, and the outer contour shape of the integrated intake valve disk 2 in fig. 10 is a shape in which two circles arranged apart from each other are connected by a tangent straight line, which is also called a kidney shape. The integral intake valve disc 2 in the shapes can eliminate the influence of air intake collision and interference in the area between two split intake valves in the prior art, so that the air intake energy is effectively improved. It should be understood by those skilled in the art that, in this case, the integral intake throat and the integral intake valve seat ring should also have corresponding shapes, and since the orthographic projection of the bottom end face of the integral intake valve disk 2 is non-perfect circle, it is necessary to avoid the integral intake valve from deflecting, and the integral intake valve can be prevented from deflecting by designing the number of the lifters to be at least 2, and since the anti-deflection effect can be achieved by providing two lifters on the integral intake valve disk 2, it is generally preferable to design the number of the lifters to be 2. Of course, the number of the tappets may be designed to be more than 2 when the requirement is particularly required, and is not limited in more detail.
In a further embodiment, when a plurality of lifters are arranged on the integrated intake valve disk 2, the distance between the top ends of any two lifters 1 and the bottom end surface of the integrated intake valve disk 2 can be selected and designed to be the same. This arrangement makes it easier to arrange the relevant components that correspond to the movement of the driving tappet.
It will of course be appreciated that the distance of the top end of at least 2 tappets 1 from the bottom end face of the integrated inlet valve disc 2 may also be designed differently, when other requirements are met. The ejector rods with different distances can be designed through the related driving parts of the tappet, so that the integral type intake valve has different movement strokes, the opening and closing modes of the integral type intake valve are diversified, and the design requirements of more complex working conditions in an engine can be met.
In some more specific embodiments, in order to better cause the air flow to generate a large-scale tumble flow in the cylinder, as shown in fig. 4 and 5, a part of the bottom surface edge of the integrated intake valve disk 2 is protruded downward to form a flow-blocking protrusion 3, and when the integrated intake valve 1 is mounted to the integrated intake throat 4 of the cylinder head, the flow-blocking protrusion 3 is located on the side close to the exhaust throat 6. The working principle is as follows: when the engine cylinder inhales, the integral intake valve is opened, the airflow enters the cylinder through the integral intake throat, and the flow blocking bulge is positioned on one side close to the exhaust throat, so that when the airflow flows in the cylinder, the flow blocking bulge can block part of the airflow from moving to one side of the integral intake throat, so that more airflows move towards the direction of the exhaust throat, the airflow more easily forms large-scale tumble motion in the cylinder, and the tumble effect in a combustion chamber of a developed gas engine can be improved on the basis of the diesel engine.
In some specific embodiments, the projection of the flow blocking protrusion 3 on the bottom surface of the integrated intake valve disc 2 may be an arcuate projection, the projection direction of the arcuate projection faces the outer side of the integrated intake valve disc 2, and the width of the middle of the arcuate projection is greater than the widths of the two ends of the arcuate projection, for example, the projection may be designed as a crescent projection structure, but is not limited to a crescent structure.
It should be noted here that the arcuate projection may be designed to be at least partially inside the bottom end face of the integrated intake valve disk 2; the arc projection can be designed to be at least partially positioned outside the bottom end face of the integral type intake valve disc 2, and the arrangement can be selected according to actual requirements in the practical application process.
In some more specific embodiments, in order to adapt to engines of different models, as shown in fig. 5, the height H of the flow-blocking protrusion 3 protruding downward relative to the bottom surface of the integral intake valve disc 2 may be selected to satisfy the following relationship: h is more than 0 and less than or equal to 0.05D; or H is more than 0 and less than or equal to 0.1D; or H is more than 0 and less than or equal to 0.2D, wherein D is the width of the integral type air inlet valve disc 2 relative to the integral type air inlet throat towards the exhaust throat. In the practical application process, corresponding design parameters can be selected according to specific models.
In a further embodiment, the arcuate projection may be specifically designed to be arranged along the circumferential edge of the integrated intake valve disk 2, and in order to adapt to different models of engines, the arcuate projection covers an angle θ in the circumferential direction of the integrated intake valve disk 2, which satisfies the relationship: theta is more than 0 and less than or equal to 240 degrees, and other circumferential coverage angle ranges can be designed, such as more than 0 and less than or equal to 60 degrees; for example, 0 < theta ≦ 120 degrees, as shown in FIG. 6. In the practical application process, corresponding design parameters can be selected according to specific models and design requirements.
In some specific embodiments, the joint position of the side of the flow blocking protrusion 3 away from the exhaust throat and the bottom end face of the integral intake valve disk 2 is preferably designed to be a smooth curved surface. Become the smooth curved surface and be convenient for the air current direction more through designing into, it is that what need explain, smooth curved surface specifically can be for forming in the fillet of linking up the position, also be the indent arcwall face, and in order to adapt to different models and design demand, as shown in fig. 5, the fillet radius R of this indent arcwall face specifically can select to satisfy the relation: r is more than 0 and less than or equal to 0.05D; or R is more than 0 and less than or equal to 0.1D; or R is more than 0 and less than or equal to 0.2D, wherein D is the width of the integral type air inlet valve disc 2 relative to the integral type air inlet throat towards the exhaust throat. In the practical application process, corresponding design parameters can be selected according to specific models and design requirements.
In addition, the invention also provides a cylinder cover which comprises an integral type air inlet throat 4 and a plurality of exhaust throats 6 matched with the integral type air inlet throat 4, wherein an integral type air inlet valve seat ring 5 and an integral type air inlet valve used for being matched with the integral type air inlet valve seat ring 5 to be opened and closed to realize the on-off control of air inlet are arranged in the integral type air inlet throat 4, and the integral type air inlet valve is the integral type air inlet valve described in any scheme. Since the integral intake valve has the technical effects, the cylinder head with the integral intake valve also has the corresponding technical effects, and the description is omitted.
It should be noted that those skilled in the art should understand that the cylinder head is formed with an intake port 8 and an exhaust port 9, wherein the integrated intake throat 4 is connected to the intake port 8 and the exhaust throat 6 is connected to the exhaust port 9.
In some more specific embodiments, a side of the integrated intake valve seat ring 5 far away from the exhaust throat is provided with a tumble sharp corner 7, an axial projection of the tumble sharp corner 7 on the upper end face of the integrated intake valve seat ring 5 is a sharp-corner projection, the sharp-corner projection forms a convex area which protrudes from the inner side edge of the integrated intake valve seat ring 5 to the center of the integrated intake valve seat ring 5, and the width of the middle of the sharp-corner projection is larger than the width of the two ends of the sharp-corner projection, such as a crescent structure and the like. The tumble flow cusps 7 may be formed integrally with the integrated intake valve seat ring 5, for example, by integral casting, forging, machining, or the like. The invention does not limit the concrete processing mode of the tumble sharp angle in more detail.
The working principle of adopting the tumble sharp angle is as follows: when the engine cylinder inhales air, the integral type inlet valve is opened, as shown in figure 7, inlet airflow enters the cylinder from a gap between the integral type inlet valve seat ring 5 and the integral type inlet valve, the tumble sharp corner 7 arranged on the inner side of the integral type inlet valve seat ring 5 enables the inlet airflow to be extruded and cast towards the exhaust throat opening, so that most of the inlet airflow enters the cylinder from the gap close to one side of the exhaust throat opening, the airflow far away from one side of the exhaust throat opening is reduced, and the airflows on the two sides more easily form large-scale tumble motion after entering the cylinder.
On the basis of the existing diesel engine, the tumble sharp corner 7 structure is arranged in the integral intake valve seat ring 5, so that intake air can be thrown towards the exhaust throat when passing through the integral intake valve seat ring 5, the tumble strength in an air cylinder is favorably enhanced, turbulence is favorably formed at the last stage of compression, and the heat efficiency of a gas engine is further improved.
In some embodiments, the bottom hole of the integral intake throat 4 is provided with an intake chamfer, and the center of the intake chamfer is offset a predetermined distance in the direction of the exhaust throat relative to the center of the integral intake throat 4. Because the air inlet chamfer has obvious flow guiding effect, and the air inlet chamfer is designed to be deviated towards the direction of the exhaust throat, so that the width of a gap close to one side of the exhaust throat is larger, most of the air flow enters the cylinder from the gap close to one side of the exhaust throat, the air flow far away from one side of the exhaust throat is reduced, and the air flows on the two sides are easier to form large-scale tumble motion after entering the cylinder.
Therefore, on the basis of the existing diesel engine, the intake chamfer is designed into the eccentric chamfer, so that the effective diversion of the intake airflow is realized, the tumble strength is favorably enhanced, the turbulent flow is favorably formed at the last stage of compression, and the heat efficiency of the gas engine is improved.
It should be noted that the longitudinal section of the eccentric chamfer may be linear or curved, and the specific structural form of the eccentric chamfer is not specifically limited in the present invention.
In a further embodiment, the cylinder head air inlet can be specifically arranged on the side face or the top face or the bottom face of the cylinder head, and in the practical application process, the air inlet can be selectively arranged according to the practical requirements, so that the installation and arrangement of engines of different models can be realized.
In addition, the invention also provides a gas engine, which comprises a cylinder cover, wherein the cylinder cover is the cylinder cover described in any scheme, and the cylinder cover has the technical effects, so that the gas engine with the cylinder cover also has the corresponding technical effects, and the details are not repeated.
The invention has the following beneficial effects:
1) according to the scheme, the original two intake valves are jointly designed to form a complete intake valve disk part, so that the air intake direction can be effectively controlled, and the middle hedging air flow between the two intake valves is completely eliminated, so that the tumble motion is more easily organized;
2) compared with the traditional two air inlet channel structures which are separately arranged, the scheme can remove the cooling water jacket structure between the two air inlet channels, thereby enlarging the flow area of the air channel and enhancing the flow capacity;
3) because the explosion pressure of the gas engine is low, the wear of the intake valve is small, and therefore the integral intake valve which cannot rotate relative to the seat ring has higher feasibility in the gas engine.
The integral intake valve, cylinder head and gas engine provided by the invention are described in detail above. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is also noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (14)

1. The integral intake valve is applied to a gas engine reformed on the basis of a diesel engine, and is characterized by comprising an integral intake valve disc (2) and tappets (1) which are connected to the integral intake valve disc (2) and vertical to the bottom end surface of the integral intake valve disc (2), wherein the number of the tappets (1) is at least two, the integral intake valve disc (2) is used for being matched with an integral intake valve seat ring (5) at an integral intake throat (4) formed on a cylinder cover to be opened and closed so as to realize the on-off control of the integral intake valve, and the integral intake throat (4) is simultaneously matched with a plurality of exhaust throats (6) corresponding to the same combustion chamber;
the local part of the bottom surface edge of the integral type air inlet valve disc (2) protrudes downwards to form a flow blocking protruding part (3), and when the integral type air inlet valve is installed on an integral type air inlet throat of the cylinder cover, the flow blocking protruding part (3) is located on one side close to the exhaust throat (6).
2. The integrated intake valve according to claim 1, wherein the orthographic projection of the bottom end face of the integrated intake valve disk (2) is oval, kidney-shaped, willow-leaf-shaped or a shape formed by intersecting two circles.
3. An integral inlet valve according to claim 1 characterised in that the top ends of any two lifters (1) are at the same distance from the bottom end face of the integral inlet valve disc (2).
4. The integral intake valve according to claim 2, characterized in that the number of the lifters (1) is two.
5. An integral inlet valve according to claim 1 characterized in that the top ends of at least two lifters (1) are at different distances from the bottom end surface of the integral inlet valve disc (2).
6. The integrated intake valve according to claim 1, wherein the projection of the flow blocking protrusion (3) on the bottom surface of the integrated intake valve disk (2) is an arcuate projection, and the convex direction of the arcuate projection faces the outer side of the integrated intake valve disk (2), and the width of the middle of the arcuate projection is greater than the width of the two ends of the arcuate projection.
7. The integrated inlet valve according to claim 6, characterised in that the arcuate projection is at least partly inside the bottom end face of the integrated inlet valve disc (2); or the arc projection is at least partially positioned outside the bottom end surface of the integral intake valve disc (2).
8. The integrated intake valve according to claim 6, wherein the arcuate projection is arranged along a circumferential edge of the integrated intake valve disc (2) and covers an angle θ in the circumferential direction of the integrated intake valve disc (2) satisfying the relationship: theta is more than 0 and less than or equal to 240 degrees.
9. The integrated intake valve according to claim 6, wherein a surface of the choke boss (3) facing the center of the integrated intake valve disk (2) and a position where the bottom end surface of the integrated intake valve disk (2) is joined are smoothly curved.
10. The intake valve of claim 9, wherein said smooth curved surface is an inwardly concave arcuate surface rounded at said engagement locations.
11. A cylinder cover, characterized by comprising an integral intake throat (4) and a plurality of exhaust throats (6) simultaneously matched with the integral intake throat (4), wherein an integral intake valve seat ring (5) and an integral intake valve used for being matched with the integral intake valve seat ring (5) to open and close to realize the on-off control of intake are arranged in the integral intake throat (4), and the integral intake valve is the integral intake valve according to any one of claims 1-10.
12. The cylinder head according to claim 11, characterized in that a tumble flow cusp (7) is provided in the side of the integrated intake valve seat insert (5) away from the exhaust throat, and an axial projection of the tumble flow cusp (7) on the upper end surface of the integrated intake valve seat insert (5) is a cusp projection that forms a convex region that protrudes from the inside edge of the integrated intake valve seat insert (5) toward the center of the integrated intake valve seat insert (5), and the width of the middle of the cusp projection is greater than the widths of both ends thereof.
13. A cylinder head according to claim 11, characterized in that the bottom aperture of the integrated inlet throat (4) is provided with an inlet chamfer having a center which is offset by a predetermined distance in the direction of the exhaust throat with respect to the center of the integrated inlet throat (4).
14. A gas engine comprising a cylinder head, characterized in that the cylinder head is a cylinder head according to any one of claims 11-13.
CN202110951793.5A 2021-08-19 2021-08-19 Integral intake valve, cylinder head and gas engine Active CN113404568B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB465261A (en) * 1936-01-16 1937-05-04 Jean Blanchet Improvements in and relating to inlet valves for internal combustion engines
US4790272A (en) * 1987-10-15 1988-12-13 Woolenweber William E Non-circular poppet valves for internal combustion engine cylinder assemblies
US4981118A (en) * 1990-04-12 1991-01-01 Pierre Lefebvre Poppet valve for internal combustion engine
DE19712700A1 (en) * 1997-03-26 1998-12-03 Basnak Viktor Valve for high performance four-stroke reciprocating piston engine
US20070181098A1 (en) * 2006-02-07 2007-08-09 Bruno De Prato Internal combustion engine with three valves per cylinder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB465261A (en) * 1936-01-16 1937-05-04 Jean Blanchet Improvements in and relating to inlet valves for internal combustion engines
US4790272A (en) * 1987-10-15 1988-12-13 Woolenweber William E Non-circular poppet valves for internal combustion engine cylinder assemblies
US4981118A (en) * 1990-04-12 1991-01-01 Pierre Lefebvre Poppet valve for internal combustion engine
DE19712700A1 (en) * 1997-03-26 1998-12-03 Basnak Viktor Valve for high performance four-stroke reciprocating piston engine
US20070181098A1 (en) * 2006-02-07 2007-08-09 Bruno De Prato Internal combustion engine with three valves per cylinder

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