CN214533263U - Cylinder head and gas engine - Google Patents

Cylinder head and gas engine Download PDF

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Publication number
CN214533263U
CN214533263U CN202121945113.0U CN202121945113U CN214533263U CN 214533263 U CN214533263 U CN 214533263U CN 202121945113 U CN202121945113 U CN 202121945113U CN 214533263 U CN214533263 U CN 214533263U
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air inlet
flow
throat
cylinder head
intake
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CN202121945113.0U
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李卫
吕顺
祁同晖
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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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
    • Y02T10/12—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

Abstract

The utility model discloses a cylinder head and gas engine reforms transform gas engine who forms on being applied to diesel engine's basis, including the intake duct that forms in the cylinder head, the intake duct includes first air inlet channel and second air inlet channel, and first air inlet channel includes first air inlet and first air inlet laryngeal opening, and second air inlet channel includes second air inlet and second air inlet laryngeal openingEffective volume V of the first intake runner1Greater than the effective volume V of the second inlet flow channel2(ii) a Flow area S of the first inlet1Is larger than the flow area S of the second air inlet2And S is1And S2Satisfies the relationship: s1=k（V1/V2）S2And k is an allowable preset deviation coefficient. The structure of the cylinder cover avoids the problem that the tumble effect is reduced due to the different flow at the positions of the two air inlet throats corresponding to the inlet valve seat rings.

Description

Cylinder head and gas engine
Technical Field
The utility model relates to an engine technical field that admits air especially relates to a cylinder head and 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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a cylinder head and gas engine to improve the tumble flow effect in the gas engine's of development on promoting diesel engine's the basis.
In order to achieve the above object, the present invention provides a cylinder head for a gas engine reformed on the basis of a diesel engine, including an inlet channel formed in the cylinder head, the inlet channel including a first inlet channel and a second inlet channel, the first inlet channel including a first inlet and a first inlet throat, the second inlet channel including a second inlet and a second inlet throat, the first inlet throat being provided with a first inlet seat ring, the second inlet throat being provided with a second inlet seat ring, the inner diameter of the first inlet seat ring being equal to the inner diameter of the second inlet seat ring; effective volume V of the first intake runner1Is larger than the effective volume V of the second air inlet flow passage2(ii) a A flow area S of the first air inlet1Is larger than the flow area S of the second air inlet2And S is1And S2Satisfies the relationship: s1=k（V1/V2）*S2And enabling the flow difference value of the outflow gas flow of the first air inlet throat and the outflow gas flow of the second air inlet throat to be within a preset deviation range, wherein k is an allowable preset deviation coefficient.
Preferably, the first inlet port and the second inlet port intersect to form a common inlet port, and the common inlet port is divided into a flow area of the first inlet port and a flow area of the second inlet port from the intersection position; the first air inlet channel comprises a first main channel section and a first branch channel section communicated with the tail end of the first main channel section, the second air inlet channel comprises a second main channel section and a second branch channel section communicated with the tail end of the second main channel section, the first main channel section and the second main channel section are continuously communicated from the common air inlet to the tail ends of the first main channel section and the second main channel section to form a common air inlet channel, the common air inlet channel is divided from the intersecting position to form a flow guide channel of the first main channel section and a flow guide channel of the second main channel section, the first air inlet throat is formed at the tail end of the first branch channel section, and the second air inlet throat is formed at the tail end of the first branch channel section.
Preferably, any cross section of the common inlet flow channel is the same as the flow surface of the common inlet.
Preferably, the shape of the common air inlet is a gourd shape formed by intersecting a large circle and a small circle.
Preferably, the first intake runner and the second intake runner are two independent intake runners.
Preferably, S is set on the premise that the flow difference between the outflow of the first throat and the outflow of the second throat is within a preset deviation range1And S2Satisfies the relationship: 1S2＜S1≤1.6S2。
Preferably, k is 0.75-1.2.
Preferably, a section of the first intake runner close to the first intake throat is a first tumble guiding air passage, a section of the second intake runner close to the second intake throat is a second tumble guiding air passage, and the first tumble guiding air passage and the second tumble guiding air passage are both provided with flow guide curved surface portions for guiding air to move towards the exhaust throat directions of the respective corresponding cylinder heads.
Preferably, the first intake port and the second intake port are simultaneously disposed at a side of the cylinder head; or both disposed on the top surface of the cylinder head; or both disposed on a bottom surface of the cylinder head.
Compared with the introduction content of the background technology, the cylinder cover is applied to a gas engine which is formed by transformation on the basis of a diesel engine, and comprises an air inlet channel formed in the cylinder cover, wherein the air inlet channel comprises a first air inlet channel and a second air inlet channel, the first air inlet channel comprises a first air inlet and a first air inlet throat, the second air inlet channel comprises a second air inlet and a second air inlet throat, a first air inlet seat ring is arranged at the first air inlet throat, a second air inlet seat ring is arranged at the second air inlet throat, and the inner diameter of the first air inlet seat ring is equal to the inner diameter of the second air inlet seat ring; effective volume V of first intake runner1Greater than the effective volume V of the second inlet flow channel2(ii) a Flow area S of the first inlet1Is larger than the flow area S of the second air inlet2And S is1And S2Satisfies the relationship: s1=k（V1/V2）S2And enabling the flow difference value of the outflow gas flow of the first air inlet throat and the outflow gas flow of the second air inlet throat to be within a preset deviation range, wherein k is an allowable preset deviation coefficient. By adopting the structure of the cylinder cover, the effective volume V of the first air inlet channel1Greater than the effective volume V of the second inlet flow channel2In the case of (1), since the inner diameter of the first intake retainer is equal to the inner diameter of the second intake retainer, the flow area S of the first intake port is set to be equal to the inner diameter of the second intake retainer1And the flow area S of the second air inlet2Designed in an asymmetrical configuration, i.e. with the flow area S of the first inlet opening1Is larger than the flow area S of the second air inlet2And S is1And S2Satisfies the relationship: s1=k（V1/V2）S2Therefore, the flow difference value of the outflow gas flow of the first air inlet throat and the outflow gas flow of the second air inlet throat is in a preset deviation range, namely the density and the speed of the airflow entering the combustion chamber through the first air inlet throat and the second air inlet throat are basically consistent, the problem that the tumble effect is reduced due to the fact that the two air inlet throats correspond to different flow at the seat ring of the air inlet valve is solved, and the tumble effect in the combustion chamber of the developed gas engine is improved on the basis of the diesel engine is improved.
Additionally, the utility model also provides a gas engine, including the cylinder head, this cylinder head is the cylinder head that any scheme of the aforesaid described, because this cylinder head has above-mentioned technological effect, consequently the gas engine who has this cylinder head also should have corresponding technological effect, no longer gives unnecessary details here.
Drawings
Fig. 1 is a schematic structural diagram of an air inlet provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the intersection of the first air inlet and the second air inlet provided in the embodiment of the present invention;
fig. 3 is another schematic structural diagram of an air inlet provided in an embodiment of the present invention;
fig. 4 is a schematic structural view illustrating a first air inlet and a second air inlet which are independent from each other according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a projected projection and a theoretical intake air flow port in a cylinder head structure provided in an embodiment of the present invention;
fig. 6 is a bottom view of the bottom surface of the cylinder head provided in the embodiment of the present invention.
In the above figures 1-6 of the drawings,
the air inlet structure comprises an air inlet channel 1, a first air inlet throat 2, a second air inlet throat 3, a first air inlet channel 4, a second air inlet channel 5, a penetration position 6, a first air inlet 7, a second air inlet 8, a flow guide bulge part 9, a convex projection 91, a connecting line 92 of two ends, a convex direction line 93 and an exhaust throat center 10.
Detailed Description
The core of the utility model is to provide a cylinder head and gas engine to improve the tumble flow effect in the gas engine's of development on promoting diesel engine's the basis.
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 FIGS. 1-4, the embodiment of the present invention provides a cylinder head for a gas engine formed by reforming a diesel engine on the basis of the cylinder head, including an inlet duct 1 formed in the cylinder head, the inlet duct 1 includes a first inlet flow channel 4 and a second inlet flow channel 5, the first inlet flow channel 4 includes a first inlet port 7 and a first inlet throat 2, the second inlet flow channel 5 includes a second inlet port 8 and a second inlet throat 2A first air inlet seat ring is arranged at the first air inlet throat 2, a second air inlet seat ring is arranged at the second air inlet throat 3, and the inner diameter of the first air inlet seat ring is equal to that of the second air inlet seat ring; effective volume V of the first intake runner 41Greater than the effective volume V of the second inlet flow channel2(ii) a Flow area S of the first intake port 71Is larger than the flow area S of the second air inlet 82And S is1And S2Satisfies the relationship: s1=k（V1/V2）S2And enabling the flow difference value of the outflow gas flow of the first air inlet throat 2 and the outflow gas flow of the second air inlet throat 3 to be within a preset deviation range, wherein k is an allowable preset deviation coefficient.
By adopting the structure of the cylinder cover, when the engine cylinder inhales air, the inlet valve is opened, the airflow flows in from the first/second air inlet, and the effective volume V of the first air inlet flow passage1Greater than the effective volume V of the second inlet flow channel2In the case of (1), since the inner diameter of the first intake retainer is equal to the inner diameter of the second intake retainer, the flow area S of the first intake port is reduced1And the flow area S of the second air inlet2Designed in an asymmetrical configuration, i.e. with the flow area S of the first inlet opening1Is larger than the flow area S of the second air inlet2And S is1And S2Satisfies the relationship: s1=k（V1/V2）S2Therefore, the flow difference value of the outflow gas flow of the first air inlet throat and the outflow gas flow of the second air inlet throat is in a preset deviation range, namely the density and the speed of the airflow entering the combustion chamber through the first air inlet throat and the second air inlet throat are basically consistent, the problem that the tumble effect is reduced due to the fact that the two air inlet throats correspond to different flow at the seat ring of the air inlet valve is solved, and the tumble effect in the combustion chamber of the developed gas engine is improved on the basis of the diesel engine is improved.
It should be noted that, as will be understood by those skilled in the art, the intake port is located outside the cylinder head. It should be noted that the allowable preset deviation coefficient k is caused by an allowable machining errorCoefficient of deviation, which is generally satisfied with S1Greater than S2On the basis of (1), the value can be selected to be 0.75-1.2. In addition, generally, a gas engine is modified for a diesel engine of a different model, and S is set to a corresponding design rule1And S2The satisfied relationship is different, and generally, on the premise that the flow difference value of the outflow gas flow of the first air inlet throat 2 and the outflow gas flow of the second air inlet throat 3 is within the preset deviation range, S1And S2The satisfying relationship can be specifically selected as follows: 1S2＜S1≤1.2S2(ii) a Or 1S2＜S1≤1.4S2(ii) a Or 1S2＜S1≤1.6S2。
In some specific embodiments, as shown in fig. 1 and fig. 2, the first inlet 7 and the second inlet 8 may be designed to intersect and form a common inlet, and the common inlet is divided into a flow area of the first inlet 7 and a flow area of the second inlet 8 from the intersection; the first air inlet channel 4 comprises a first main channel section and a first branch channel section communicated with the tail end of the first main channel section, the second air inlet channel 5 comprises a second main channel section and a second branch channel section communicated with the tail end of the second main channel section, the first main channel section and the second main channel section are continuously communicated with each other from a common air inlet to the tail ends of the first main channel section and the second main channel section to form a common air inlet channel, the common air inlet channel is divided from a communicated position 6 to form a flow guide channel of the first main channel section and a flow guide channel of the second main channel section, the first air inlet throat 2 is formed at the tail end of the first branch channel section, and the second air inlet throat 3 is formed at the tail end of the first branch channel section. The air flow passing through the common air inlet channel is arranged to form an effective flow dividing and guiding effect from the position of the common air inlet, the air flow enters the first branch flow channel section after being guided from the first main flow channel section, and enters the second branch flow channel section after being guided from the second main flow channel section, and finally the air flow flowing out from the first air inlet throat is equivalent to the air flow flowing out from the second air inlet throat (namely the flow difference value described in the foregoing is within a preset deviation range).
It should be noted that, the flow channel structure of the common intake runner may be designed in a structural form that any cross section of the common intake runner is the same as the flow surface of the common intake port. The design is more convenient not only in processing design, and is more convenient when calculating the effective volume that the fluid flows through moreover. It will of course be appreciated that the same manner of using any cross section of the common inlet conduit is merely a preferred example of an embodiment of the present invention, and that in practice, it may be designed with a varying cross section, and is not limited thereto.
It should be noted that the specific shape of the common air inlet may be a gourd shape formed by intersecting a large circle and a small circle. Other common air inlets with a diversion guide structure can be designed, and the first air inlet and the second air inlet are both non-circular, but are communicated with each other and maintain respective diversion functions, and are not limited in more detail here.
It is understood that the above-mentioned first and second inlet flow channels 4 and 5 are provided by way of a common inlet and a common inlet flow channel, which is only a preferred example of the embodiment of the present invention, and in practical applications, the first and second inlet flow channels 4 and 5 may be designed as two independent inlet flow channels, as shown in fig. 3 and 4. In the practical application process, the selection can be carried out according to the practical requirements.
In some more specific embodiments, in order to make the air flow of the air inlet passage flowing into the combustion chamber have better tumble effect, generally speaking, a corresponding tumble guiding structure needs to be arranged in the air inlet passage. For example, a section of the first intake runner 4 close to the first intake throat 2 is a first tumble flow guide air passage, a section of the second intake runner 5 close to the second intake throat 3 is a second tumble flow guide air passage, and the first tumble flow guide air passage and the second tumble flow guide air passage are both provided with flow guide curved surface portions for guiding air flows to move towards the exhaust throat directions of the corresponding cylinder heads. The flow guide curved surface part can be a part or all of the wall surface of the air inlet channel, and can also be designed to be a concave pit curved surface or a convex curved surface which is positioned on the local wall surface of the air inlet channel, and when the air flow flows through the flow guide curved surface part, the flow guide curved surface part can guide and cast the air flow.
Basic principle of the tumble guiding structure during operation: when the engine cylinder breathes in, the (air) intake valve is opened, the air current that admits air in the intake duct flows through in each runner back in proper order enters into the cylinder from the throat that admits air, make the air current that admits air move towards exhaust throat direction under the water conservancy diversion effect of each water conservancy diversion curved surface portion, thereby the air current of flow direction exhaust throat one side has been strengthened and the air current of the throat that admits air one side has been reduced, this both sides air current forms the tumble motion of large scale more easily after getting into the cylinder, and then reinforcing tumble intensity, be favorable to forming the torrent at compression final stage, promote gas engine's thermal efficiency.
Therefore, on the basis of the existing diesel engine, the flow guide curved surface part is designed at the lower reaches of the air inlet channel, so that the air inlet flow generates the tumble effect required by the gas engine, and the tumble strength and the heat efficiency of the gas engine are improved.
It should be noted that, in this scheme, the air inlet of the air inlet channel is opened on the outer side of the cylinder head, the other end of the air inlet channel is a first/second air inlet throat, and in the air inlet direction, the tumble guiding air channel is located at the downstream of the air inlet channel, wherein the tumble guiding air channel can be designed in various arrangement forms, such as inclined arrangement or vertical arrangement relative to the bottom surface of the cylinder head.
Note that, when the first/second tumble flow guide air passage is arranged obliquely with respect to the bottom surface of the cylinder head, it is defined that: one side wall surface of the tumble guide air passage close to the bottom surface of the cylinder cover is a first wall surface, and the other side wall surface in the tumble guide air passage opposite to the first wall surface is a second wall surface; the water conservancy diversion curved surface portion can specifically be designed into the sunken arc pit face of relative first wall to cylinder head bottom surface direction, for example fish mao structure, also can design into the sunken arc pit face of relative second wall to cylinder head bottom surface direction, and in the practical application process, can select to arrange according to actual demand.
It should be noted that the flow guiding curved surface portion may also be a flow guiding protrusion 9 formed at the end edge of the first wall surface and respectively located above the first air inlet throat 2 and the second air inlet throat 3, an axial projection of the flow guiding protrusion 9 on the upper end surface of each corresponding air inlet throat is a protrusion projection, the protrusion projection is located inside the corresponding air inlet throat and forms a protrusion area protruding from the edge of the upper end surface of the air inlet throat toward the center of the air inlet throat along the radial direction, and the width of the middle portion of the protrusion projection is greater than the widths of the two ends thereof, as shown in fig. 5. Specifically, when being provided with a plurality of water conservancy diversion curved surface portions on the first wall, the upside border of water conservancy diversion bulge meets with the downside border of last water conservancy diversion curved surface portion, and the downside border of water conservancy diversion bulge meets with the upside border of the inlet throat mouth that corresponds. Certainly, only the flow guide curved surface part formed by the flow guide protruding part can be arranged on the first wall surface, and the flow guide curved surface part can be arranged according to specific requirements in the practical application process. In this scheme, after the air current that admits air flows through last water conservancy diversion curved surface portion, this water conservancy diversion curved surface portion casts the air current to the second wall of offside, the water conservancy diversion bulge in this water conservancy diversion curved surface portion low reaches further makes the air current to the extrusion of second wall direction to the air current of the exhaust throat direction that has strengthened the flow direction and corresponds has reduced the air current that this intake throat kept away from exhaust throat one side, this both sides air current forms stronger tumble motion after getting into in the cylinder, thereby satisfy gas engine's combustion demand.
It should be noted that the flow guiding protrusion 9 in this embodiment is used to extrude a part of the air flow toward the exhaust throat before the intake air flow is injected into the intake throat, and the flow guiding protrusion 9 capable of implementing the above function may be designed in various structural shapes, for example, one side edge of the flow guiding protrusion 9 facing the center of the intake throat is designed to be an arc shape, a straight shape, a broken line shape or other curved structures. Preferably, the convex projection in this solution is a crescent-shaped area, and the concave side of the crescent-shaped area is arranged toward the center of the air inlet throat, i.e. one side edge of the flow guiding protrusion 9 toward the center of the air inlet throat is designed into a concave arc shape.
It should be noted that the flow guide protrusion 9 specifically includes an upper flow guide surface and a lower processing surface, the juncture of the upper flow guide surface and the lower processing surface is the edge of the flow guide protrusion 9 protruding toward the center of the air inlet throat, the lower processing surface is the processing surface formed after partial material of the cylinder head main body is removed by the flow guide protrusion processing characteristics, the flow guide protrusion processing characteristics specifically can adopt casting processing, rotary cutting processing and the like, and according to different structures of the flow guide protrusion 9, the lower processing surface specifically can be designed as a rotary processing surface, or a plurality of planes connected in sequence, or other curved surface structures and the like. Preferably, the lower side processing surface in the scheme is a rotary processing surface surrounding a processing axis, the processing axis can be designed to be coincident with, parallel to or obliquely arranged relative to the axis of the air inlet throat, and a generatrix of the rotary processing surface is a straight line, a broken line or a curve. The rotary processing surface removes partial material of the cylinder head body to form the flow guide protruding part 9.
It should be noted that, according to different bus shapes, the above-mentioned rotary processing surface can be designed into various different conical surface structures, preferably, the rotary processing surface in this scheme is a conical processing surface, the processing axis of the conical processing surface coincides with the axis of the air intake throat, and the vertex of the conical processing surface is located above the air intake throat. The concrete shape of the flow guiding protruding part 9 depends on the size of the conical angle of the conical processing surface, and the larger the conical angle is, the sharper the flow guiding protruding part 9 is. Preferably, the value range of the cone angle of the conical processing surface in the scheme is 60-160 degrees, and in the range, the guide protrusion part 9 can be ensured to have a sharp enough angle, so that the flow velocity mutation and the extrusion effect on the air inlet flow are further enhanced.
The maximum flow port formed in the upper end circular surface of the intake throat by the rotary machined surface is a theoretical intake flow port, that is, an axial projection of a circular contour formed by a conical bottom of the rotary machined surface after removing a material of the cylinder head body in the upper end circular surface of the intake throat forms the theoretical intake flow port. When the processing axis of the rotary processing surface is coincident with or parallel to the axis of the air inlet throat, the theoretical air inlet flow port is a circular flow port; when the processing axis of the rotary processing surface and the axis of the air inlet throat are arranged in a relatively inclined mode, the theoretical air inlet flow port is an oval flow port. The theoretical equivalent diameter of the air inlet flow port is DmThe inner diameter of the inlet valve seat ring (the minimum diameter of the inlet valve seat ring and the inlet valve sealing conical surface) is D,in this scheme, DmThe relationship between D and D satisfies: dm= 0.85D-D, and D ismWhen the D is 85% -100%, the circulation capacity and the tumble effect can be in balanced fit, namely, the tumble effect can be obviously achieved under the condition that the influence on the circulation capacity is minimum.
Referring to FIG. 5, the theoretical total area of the intake ports is SaThe area of the projected projection 91 is SbSince the flow guide projection 7 does not allow part of the air flow to pass through, the area of the opening of the lower end of the tumble guide air passage for the actual circulating air flow (i.e., the actual intake air flow port area S shown by the hatched portion in fig. 5)c) Equal to the total area S of the theoretical inlet flow portaMinus the area S of the projected projection 91bI.e. Sa、Sb、ScThe relationship of the three satisfies: sa = Sb +Sc。
Area S of the projected projection 91aThe larger the airflow blocking effect of the guide protrusion 9 is, the more remarkable the degree of squeezing the airflow is, that is, the more remarkable the air velocity is increased, the greater the tumble strength is generated. In order to balance the tumble effect and the air passage circulation capacity, the projection 91 protrudes the area SbDesigned as the area S of the theoretical inlet flow porta15% to 50%, i.e., SaAnd SbSatisfies the following conditions: sb/Sa=0.15~0.5。
Preferably, a connecting line between a midpoint of a connecting line 92 (as shown in fig. 5, a connecting line between two end points P1 and P2) of the two ends of the convex projection 91 and the center of the air inlet throat is a convex direction line 93, and an included angle between a connecting line between the center of the air inlet throat and the center of the exhaust throat corresponding to the air inlet throat and the convex direction line 93 is a convex direction angle β, as shown in fig. 6, the range of the convex direction angle β in the scheme is 0 ° to 45 °, so that the convex side edge of the flow guide convex part 9 can be arranged towards the direction of the adjacent exhaust throat, thereby controlling the large-scale tumble motion to fill the whole cylinder as much as possible. Wherein, the connecting line of the center of the air inlet throat and the center of the exhaust throat corresponding to the air inlet throat refers to the connecting line of the center of the air inlet throat and the center 10 of the exhaust throat, as shown in fig. 6.
Preferably, the convex projection 91 spans an arc angle θ of 90 ° -220 ° in the upper end face of the intake throat. This feature defines the extent of the span of the deflector ledge 9 in the cross-section of the tumble guide airway.
Besides, it should be noted that the first intake port 7 and the second intake port 8 may be arranged on the side of the cylinder head at the same time; or both disposed on the top surface of the cylinder head; and the engine cylinder cover is arranged on the bottom surface of the cylinder cover, and can be selectively arranged according to actual requirements in the actual application process, so that the installation arrangement of engines of different models is realized.
Additionally, the utility model also provides a gas engine, including the cylinder head, this cylinder head is the cylinder head that any scheme of the aforesaid described, because this cylinder head has above-mentioned technological effect, consequently the gas engine who has this cylinder head also should have corresponding technological effect, no longer gives unnecessary details here.
It is right above that the utility model provides a cylinder head and gas engine have carried out detailed introduction. 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 have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (10)

1. The cylinder cover is applied to a gas engine formed by transformation on the basis of a diesel engine, and comprises an air inlet channel (1) formed in the cylinder cover, and is characterized in that the air inlet channel (1) comprises a first air inlet channel (4) and a second air inlet channel (5), the first air inlet channel (4) comprises a first air inlet (7) and a first air inlet throat (2), the second air inlet channel (5) comprises a second air inlet (8) and a second air inlet throat (3), a first air inlet seat ring is arranged at the first air inlet throat (2), a second air inlet seat ring is arranged at the second air inlet throat (3), and the inner diameter of the first air inlet seat ring is equal to the inner diameter of the second air inlet seat ring; effective volume V of the first intake runner (4)1Is larger than the effective volume V of the second air inlet flow passage2(ii) a The flow area S of the first air inlet (7)1Is larger than the flow area S of the second air inlet (8)2And S is1And S2Satisfies the relationship: s1=k（V1/V2）S2And enabling the flow difference value of the outflow gas flow of the first air inlet throat (2) and the outflow gas flow of the second air inlet throat (3) to be within a preset deviation range, wherein k is an allowable preset deviation coefficient.
2. A cylinder head according to claim 1, characterized in that the first intake port (7) and the second intake port (8) intersect and form one common intake port, and the common intake port is divided into a flow area of the first intake port (7) and a flow area of the second intake port (8) from the intersection position; the first air inlet flow channel (4) comprises a first main flow channel section and a first branch flow channel section communicated with the tail end of the first main flow channel section, the second air inlet flow channel (5) comprises a second main flow channel section and a second branch flow channel section communicated with the tail end of the second main flow channel section, the first main flow channel section and the second main flow channel section are continuously communicated from the common air inlet to the tail ends of the first main flow channel section and the second main flow channel section to form a common air inlet flow channel, the common air inlet flow channel is divided into a flow guide flow channel of the first main flow channel section and a flow guide flow channel of the second main flow channel section from a intersecting position (6), the first air inlet throat (2) is formed at the tail end of the first branch flow channel section, and the second air inlet throat (3) is formed at the tail end of the first branch flow channel section.
3. The cylinder head of claim 2, wherein any cross section of the common intake runner is the same as a flow surface of the common intake port.
4. The cylinder head of claim 2, wherein said common intake port has a gourd shape in which a large circle and a small circle intersect.
5. The cylinder head according to claim 1, wherein the first intake runner (4) and the second intake runner (5) are two mutually independent intake runners.
6. A cylinder head according to claim 1, characterized in that S is satisfied that a flow difference between an outflow of the first throat (2) and an outflow of the second throat (3) is within a preset deviation range1And S2Satisfies the relationship: 1S2＜S1≤1.6S2。
7. The cylinder head of claim 1, wherein k has a value of 0.75 to 1.2.
8. The cylinder head according to claim 1, wherein a section of the first intake runner (4) near the first intake throat (2) is a first tumble flow guide runner, a section of the second intake runner (5) near the second intake throat (3) is a second tumble flow guide runner, and the first tumble flow guide runner and the second tumble flow guide runner are each provided with a flow guide curved surface portion for guiding a flow of air in a direction toward an exhaust throat of the respective cylinder head.
9. A cylinder head according to claim 1, characterized in that the first inlet port (7) and the second inlet port (8) are arranged simultaneously on the side of the cylinder head; or both disposed on the top surface of the cylinder head; or both disposed on a bottom surface of the cylinder head.
10. A gas engine comprising a cylinder head, characterized in that the cylinder head is a cylinder head according to any one of claims 1-9.
CN202121945113.0U 2021-08-19 2021-08-19 Cylinder head and gas engine Active CN214533263U (en)

Priority Applications (1)

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CN202121945113.0U CN214533263U (en) 2021-08-19 2021-08-19 Cylinder head and gas engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121945113.0U CN214533263U (en) 2021-08-19 2021-08-19 Cylinder head and gas engine

Publications (1)

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CN214533263U true CN214533263U (en) 2021-10-29

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Country Link
CN (1) CN214533263U (en)

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