CN217481411U - Cylinder cover and gas engine - Google Patents

Cylinder cover and gas engine Download PDF

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Publication number
CN217481411U
CN217481411U CN202123058910.XU CN202123058910U CN217481411U CN 217481411 U CN217481411 U CN 217481411U CN 202123058910 U CN202123058910 U CN 202123058910U CN 217481411 U CN217481411 U CN 217481411U
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Prior art keywords
throat
cylinder head
intake
curved surface
air
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Chinese (zh)
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李卫
吕顺
庞斌
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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
    • 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
    • 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
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

The utility model discloses a cylinder head and gas engine, wherein, the cylinder head includes intake duct, air intake throat and exhaust throat, being close to of intake duct one section of air intake throat is the tumble direction air flue, the wall of tumble direction air flue is equipped with at least two and is used for guiding the air inflow direction the water conservancy diversion curved surface portion of exhaust throat direction motion. The utility model discloses on the basis of current diesel engine, through a plurality of water conservancy diversion curved surface portions of low reaches design at the intake duct for the air current that admits air produces the required tumble flow effect of gas engine, and then promotes tumble intensity and gas engine's thermal efficiency.

Description

Cylinder cover and gas engine
The present application claims priority from the chinese patent application entitled "a cylinder head and a gas engine" filed by the chinese patent office on 19/08/2021 with application number 202110951821.3, which is incorporated herein by reference in its entirety.
Technical Field
The utility model relates to the technical field of engines, especially, relate to a cylinder head 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 diesel engines, where the combustion mode is diffusion combustion, a certain degree of swirl helps the oil jet mix with the air, thereby improving the combustion process, and therefore, it is desirable that the air inlet passage in the engine cylinder head 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, which has low requirements on the strength of vortex, and needs small-scale turbulent motion to form a flame wrinkle surface, so as to accelerate the propagation speed of flame and improve the thermal efficiency, wherein the turbulent motion refers to a small non-fixed swirling flow in many directions generated in a flow field when the air flow speed is high, and is different from laminar motion. For a gas engine, the strength of the vortex does not need to be improved, and the improvement of the tumble strength in the cylinder can be beneficial to forming turbulence at the end stage of compression, 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 cylinder cover of the existing gas engine which is integrally transformed and designed by the cylinder cover of the diesel engine, tumble needed by the gas engine is difficult to generate in the cylinder.
Therefore, how to improve the tumble strength in the cylinder of the gas engine is a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a cylinder head, this cylinder head makes the gas that gets into in the cylinder produce the required tumble motion of gas engine through the mode of change intake duct structure on the basis of current diesel engine to can improve tumble intensity, and then promote gas engine's thermal efficiency. Another object of the present invention is to provide a gas engine including the above cylinder head.
In order to achieve the above object, the present invention provides the following technical solutions:
the utility model provides a cylinder head, includes intake duct, intake throat and exhaust throat, being close to of intake duct one section of intake throat is tumble flow direction air flue, tumble flow direction air flue arranges for the slope of cylinder head bottom surface, be close to of tumble flow direction air flue a side wall face of cylinder head bottom surface is first wall, in the tumble flow direction air flue with another side wall face that first wall is relative is the second wall, be equipped with in the tumble flow direction air flue and be used for guiding the inflow air flow to the curved face portion of water conservancy diversion of exhaust throat direction motion, the curved face portion of water conservancy diversion is one of first layout structure, second layout structure and third layout structure, wherein:
the first layout structure is as follows: at least two arc-shaped pit surfaces which are sunken towards the bottom surface of the cylinder cover relative to the first wall surface are distributed on the first wall surface along the air inlet direction;
the second layout structure is as follows: a first flow guide curved surface part and a second flow guide curved surface part are arranged in the tumble guide air passage, the first flow guide curved surface part is an arc-shaped pit surface which is arranged on the first wall surface and is sunken towards the bottom surface of the cylinder cover relative to the first wall surface, the second wall surface which is arranged opposite to the first flow guide curved surface part forms the second flow guide curved surface part, and the second flow guide curved surface part is a smooth curved surface which is gradually close to the exhaust throat opening along the air inlet direction;
the third layout structure is as follows: the cylinder cover comprises a first wall surface and a second wall surface, wherein the first wall surface is provided with a first flow guide curved surface part and a second flow guide curved surface part along the air inlet direction, the first flow guide curved surface part is an arc pit surface which is concave towards the bottom surface direction of the cylinder cover relative to the first wall surface, the second flow guide curved surface part is a flow guide protruding part which is positioned above the air inlet throat, the axial projection of the flow guide protruding part on the upper end surface of the air inlet throat is a protruding projection, the protruding projection is positioned on the inner side of the air inlet throat and forms a protruding area which protrudes from the edge of the upper end surface of the air inlet throat to the center of the air inlet throat along the radial direction, and the width of the middle part of the protruding projection is larger than the widths of the two ends of the protruding projection.
Preferably, when the diversion curved surface portion is the first layout structure, the lower side edge of the last arc-shaped pit surface distributed along the air inlet direction on the first wall surface is connected with the upper side edge of the air inlet throat.
Preferably, when the diversion curved surface portion is in the first layout structure, a first arc-shaped pit surface and a second arc-shaped pit surface are distributed on the first wall surface along the air inlet direction, the distance between the deepest position of the first arc-shaped pit surface relative to the first wall surface depression and the axis of the air inlet throat is 0.8-2.9 times of the inner diameter of the intake valve seat ring, and the distance between the deepest position of the second arc-shaped pit surface relative to the first wall surface depression and the axis of the air inlet throat is 0.2-1.6 times of the inner diameter of the intake valve seat ring.
Preferably, when the flow guiding curved surface portion is in the second layout structure, the lower side edge of the first flow guiding curved surface portion and the lower side edge of the second flow guiding curved surface portion are both connected with the upper side edge of the air inlet throat.
Preferably, when the flow guide curved surface portion is in the second layout structure, a plane passing through an axis of the intake throat and an axis of the exhaust throat is a vertical feature surface, an intersection line of the second wall surface and the vertical feature surface is a second wall surface feature line, and the second wall surface feature line is a straight line inclined relative to the bottom surface of the cylinder head.
Preferably, the maximum distance between the second wall surface and the bottom surface of the cylinder cover is 0.8-1.5 times of the inner diameter of the intake valve seat ring, and the maximum distance between the upper side edge of the first flow guide curved surface part and the axis of the intake throat opening is 0.8-2 times of the inner diameter of the intake valve seat ring.
Preferably, the included angle between the characteristic line of the second wall surface and the bottom surface of the cylinder cover is 40-80 degrees.
Preferably, when the flow guide curved surface portion is the second layout structure, a plane parallel to the axis of the intake throat and the axis of the exhaust throat is a vertical feature surface, an intersection line of the second wall surface and the vertical feature surface is a second wall surface feature line, and the second wall surface feature line is an arc line protruding towards the bottom surface of the cylinder head.
Preferably, the length of the projection of the second wall surface on the bottom surface of the cylinder head is 0.5-3 times of the inner diameter of the intake valve seat ring.
Preferably, when the flow guiding curved surface portion is in the second layout structure, the minimum distance between the flow guiding protruding portion and the axis of the air inlet throat is greater than 0 and less than or equal to 0.5 times of the inner diameter of the air inlet valve seat ring, the deepest portion of the first flow guiding curved surface portion, which is recessed relative to the first wall surface, is a pit position point, the distance between the pit position point and the axis of the air inlet throat is 0.5-3 times of the inner diameter of the air inlet valve seat ring, and the distance between the pit position point and the bottom surface of the cylinder head is greater than 0 and less than or equal to the inner diameter of the air inlet valve seat ring.
Preferably, the number of the air inlet throat openings is one or two or three, and each air inlet throat opening is correspondingly connected with one air inlet channel.
Preferably, the number of the air inlet channels is two or three, and each air inlet channel is arranged in a separated mode.
Preferably, the number of the air inlet channel is two or three, and at least two of the guide curved surface parts in the air inlet channel are different.
Preferably, an intake port of the intake passage is disposed at a side surface or a top surface or a bottom surface of the cylinder head.
The utility model provides a cylinder head, including intake duct, air intake throat and exhaust throat, being close to of intake duct one section of air intake throat is tumble direction air flue, the wall of tumble direction air flue is equipped with at least two and is used for guiding the air inflow direction the water conservancy diversion curved surface portion of exhaust throat direction motion.
The working principle of the utility model is as follows:
when the engine cylinder breathes in, the (air) intake valve is opened, the air current that admits air in the intake duct flows through behind each water conservancy diversion curved surface portion in proper order enters into the cylinder combustion chamber from the inlet throat mouth, make the air current that admits air move towards exhaust throat mouth direction under the water conservancy diversion effect of each water conservancy diversion curved surface portion, thereby the air current of flow direction exhaust throat mouth one side has been strengthened and the air current of inlet throat mouth one side has been reduced, this both sides air current forms the large-scale tumble motion after getting into the cylinder more easily, and then reinforcing tumble intensity, be favorable to forming the torrent at compression final stage, promote gas engine's thermal efficiency.
Therefore, the utility model discloses on the basis of current diesel engine, through the curved face portion of the low reaches design a plurality of water conservancy diversion at the intake duct for the air current that admits air produces the required tumble flow effect of gas engine, and then promotes tumble intensity and gas engine's thermal efficiency.
The utility model also provides a gas engine of including above-mentioned cylinder head. The derivation process of the beneficial effect of the gas engine is substantially similar to the derivation process of the beneficial effect brought by the cylinder cover, and therefore, the derivation process is not described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a first cylinder head according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a second cylinder head according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a third cylinder head according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a fourth cylinder head according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a projected projection and theoretical intake vent in a fourth cylinder head configuration according to an embodiment of the present invention;
fig. 6 is a bottom view of a cylinder head bottom surface in a fourth cylinder head structure according to an embodiment of the present invention.
The meaning of the individual reference numerals in fig. 1 to 6 is as follows:
1-air inlet channel, 2-air inlet throat, 3-air cylinder, 4-first wall surface, 5-second wall surface, 6-cylinder cover bottom surface, 7-flow guide protrusion part, 21-air inlet valve seat ring, 22-air inlet throat axis, 23-theoretical air inlet flow port, 24-connecting line of air inlet throat center and exhaust throat center, 41-first arc pit surface, 42-second arc pit surface, 43-first flow guide curved surface part, 51-second wall surface characteristic line, 71-projection, 72-connecting line of two ends, 73-projection direction line and 8-exhaust throat center.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 4, fig. 1 to 4 are schematic structural views of a first cylinder head to a fourth cylinder head according to an embodiment of the present invention.
The utility model provides a cylinder head, including intake duct 1, intake throat 2 and exhaust throat (not shown in the figure), one section that is close to intake throat 2 of intake duct 1 is for the tumble direction air flue, and the wall of tumble direction air flue is equipped with at least two water conservancy diversion curved surface portions that are used for guiding the air inflow to the motion of exhaust throat direction. The air inlet duct comprises an air inlet duct wall surface, a flow guide curved surface part, a concave curved surface and a convex curved surface, wherein the flow guide curved surface part can be a part or all of the air inlet duct wall surface and can also be designed into a concave curved surface or a convex curved surface which is positioned on the local part of the air inlet duct wall surface, and when air inlet flows through the flow guide curved surface part, the flow guide curved surface part can guide and cast the air flow.
The working principle of the utility model is as follows:
when the engine cylinder breathes in, the (air) intake valve is opened, the air current that admits air in the intake duct 1 flows through in proper order and enters into cylinder 3 from air inlet throat 2 behind each water conservancy diversion curved surface portion, make the air current that admits air move towards air outlet throat direction under the water conservancy diversion effect of each water conservancy diversion curved surface portion, thereby the air current of flow direction air outlet throat one side has been strengthened and the air current of air inlet throat 2 one side has been reduced, this both sides air current forms the big scale tumble motion after getting into cylinder 3 more easily, and then reinforcing tumble intensity, be favorable to forming the torrent at compression final stage, promote gas engine's thermal efficiency.
Therefore, the utility model discloses on the basis of current diesel engine, through a plurality of water conservancy diversion curved surface portions of low reaches design at intake duct 1 for the air current that admits air produces the required tumble flow effect of gas engine, and then promotes tumble intensity and gas engine's thermal efficiency.
It should be noted that, in the present embodiment, the air inlet of the air inlet channel 1 is opened on the outer side of the cylinder head, the other end of the air inlet channel 1 is an air inlet throat 2, and in the air inlet direction, the tumble guiding air channel is located at the downstream of the air inlet channel 1, wherein the tumble guiding air channel may be designed in various arrangement forms, such as being obliquely arranged or vertically arranged with respect to the bottom surface 6 of the cylinder head. In a preferable mode, the tumble flow guide air passage is obliquely arranged relative to the cylinder head bottom surface 6, the tumble flow guide air passage is gradually close to the intake throat 2 and the exhaust throat in the intake direction, as shown in fig. 1 to 4, one side wall surface of the tumble flow guide air passage close to the cylinder head bottom surface 6 is a first wall surface 4, and the other side wall surface of the tumble flow guide air passage opposite to the first wall surface 4 is a second wall surface 5. The utility model discloses in can all be provided with at least one water conservancy diversion curved surface portion on first wall 4 and second wall 5, also can only be provided with two at least water conservancy diversion curved surface portions on first wall 4.
Specifically, the utility model provides an it is equipped with the curved face portion of water conservancy diversion that is used for guiding the air inlet flow to the motion of exhaust larynx mouth direction in the tumble direction air flue, this water conservancy diversion curved face portion is one of first layout structure, second layout structure and third layout structure.
The first layout structure is that at least two arc-shaped pit surfaces which are sunken towards the bottom surface 6 of the cylinder cover relative to the first wall surface 4 are distributed on the first wall surface 4 along the air inlet direction. The arc-shaped pit surface can generate a throwing effect on the intake air flow, namely, the intake air flow firstly enters the bottom of the pit from the upper side edge of the arc-shaped pit surface when flowing through the arc-shaped pit surface, then flows out from the lower side edge of the arc-shaped pit surface, when the air flow flows out from the lower side edge, because the inner diameter of the air inlet channel corresponding to the lower side edge from the bottom of the pit becomes smaller, therefore, the air flow is accelerated, and meanwhile, the lower half section of the arc-shaped pit surface can throw the air flow to the second wall surface 5 at the opposite side, so that the intake air flow mainly flows along the second wall surface 5 after flowing out of the arc-shaped pit surface, and the second wall surface 5 is closer to the exhaust throat direction, so that, when the intake air flows into the cylinder 3 from the intake throat 2, mainly enters the combustion chamber from a gap at one side close to the exhaust throat, and the main air inlet direction of the inlet airflow is shown by an arrow at the inlet throat 2 in figure 1. In this embodiment, since the first wall surface 4 is provided with a plurality of arc-shaped concave pit surfaces arranged along the air intake direction, multiple acceleration and guiding projection actions can be generated on the intake air flow, so as to further enhance the air flow on the second wall surface 5 side. After most of the intake airflow enters the cylinder 3 from the gap on the side close to the exhaust throat, the intake airflow is blocked by the wall surface of the cylinder 3, so that the tumble strength is more favorably enhanced, and the tumble direction is shown by an arc arrow in the cylinder 3 in fig. 1.
Further preferably, the lower side edge of the last arc-shaped pit surface distributed along the air inlet direction on the first wall surface 4 is connected with the upper side edge of the air inlet throat 2, so that the arc-shaped pit surface at the tail end of the tumble guide air passage can throw the air flow to one end, closest to the air inlet throat 2, of the second wall surface 5, and when the air inlet valve is opened, most of the air flow entering the air cylinder 3 from a gap of the air inlet throat 2 towards one side of the air outlet throat can be enabled to further enhance the tumble strength in the air cylinder 3.
In a specific embodiment, as shown in fig. 1, a first arc-shaped pit surface 41 and a second arc-shaped pit surface 42 are distributed on the first wall surface 4 along the air intake direction, the distance (first pit distance L1) between the deepest position of the first arc-shaped pit surface 41, which is recessed relative to the first wall surface 4, and the axis (the air intake throat axis 22 shown in fig. 1) of the air intake throat 2 is 0.8-2.9 times of the inner diameter (the minimum diameter of the air intake valve seat ring 21 and the air intake valve sealing conical surface) D of the air intake valve seat ring, and specifically, the first pit distance L1 may be 0.8 times, 1.2 times, 1.6 times, 2.1 times, 2.5 times or 2.9 times of the inner diameter D of the air intake valve seat ring. The distance (second pit distance L2) between the deepest position of the second arc-shaped pit surface 42 recessed relative to the first wall surface 4 and the inlet throat axis 22 is 0.2 to 1.6 times of the inlet valve seat inner diameter D, and specifically, the second pit distance L2 may be 0.2 times, 0.8 times, 1.2 times or 1.6 times of the inlet valve seat inner diameter D. The air current is thrown tentatively behind first arc pit face 41, and the air current after throwing has the trend of getting back to first wall 4 after the extrusion of second wall 5, and this scheme is through the position of two arc pit faces on the rational arrangement first wall 4 for the air current can move to second arc pit face 42 after the extrusion of second wall 5, thereby is thrown once more, and then strengthens the generating strength of tumble motion.
The second layout structure includes a first flow guiding curved surface portion 43 and a second flow guiding curved surface portion, the first flow guiding curved surface portion 43 is an arc-shaped concave pit surface which is arranged on the first wall surface 4 and is concave towards the cylinder cover bottom surface 6 relative to the first wall surface 4, and the second wall surface 5 arranged opposite to the first flow guiding curved surface portion 43 forms a second flow guiding curved surface portion, namely, the second wall surface 5 opposite to the first flow guiding curved surface portion 43 is the second flow guiding curved surface portion, and the second flow guiding curved surface portion is a smooth curved surface which is gradually close to the exhaust throat along the air inlet direction. In the scheme, the arc-shaped concave pits are used for guiding and projecting the air inlet flow, and the smooth second flow guide curved surface part gradually close to the exhaust throat is used for guiding the air inlet flow, so that most of the air inlet flow enters the cylinder 3 from a gap on one side, close to the exhaust throat, of the air inlet throat 2, and the tumble strength in the cylinder 3 is improved.
Preferably, when the water conservancy diversion curved surface portion is the second overall arrangement structure, the downside border of first water conservancy diversion curved surface portion 43 and the downside border of second water conservancy diversion curved surface portion all meet with the upside border of intake throat 2, so set up, make the arc pit face can be thrown the air current to the one end that the second water conservancy diversion curved surface portion is closest to intake throat 2, the junction between the upside border of second water conservancy diversion curved surface portion and intake throat 2 (namely the upside border that intake throat 2 is close to exhaust throat one side) does not have other bending surface structures, the kinetic energy loss of gas flow has been reduced, when the (air) intake valve is opened, just can make most minute inlet airflow enter into cylinder 3 from the gap of intake throat 2 towards exhaust throat one side, and then further strengthen the tumble strength in the cylinder 3.
As shown in fig. 2, in a specific embodiment, when the flow guiding curved surface portion is in the second layout structure, a plane passing through the axis 22 of the intake throat and the axis of the exhaust throat is a vertical characteristic surface, an intersection line of the second wall surface 5 and the vertical characteristic surface is a second wall surface characteristic line 51, and since an extending direction of a projection of the tumble flow guide duct on the bottom surface 6 of the cylinder head is consistent with a direction of the intake throat 2 toward the corresponding exhaust throat, the extending direction of the second wall surface characteristic line 51 is the extending direction of the second wall surface 5 of the tumble flow guide duct. In this embodiment, the second wall surface characteristic line 51 is a straight line inclined with respect to the cylinder head bottom surface 6, that is, in the air intake direction, the second flow guiding curved surface portion extends in a direction in which the straight line descends, so that the airflow ejected by the arc-shaped pit surface of the first wall surface 4 further flows in a direction in which the straight line descends, and the intake airflow rapidly descends before entering the intake throat 2, thereby further improving the tumble strength while reducing the energy loss of the airflow.
Further preferably, the maximum distance between the second wall surface 5 and the cylinder head bottom surface 6 (i.e., the height H1 of the second wall surface characteristic line 51 shown in fig. 2) is 0.8 to 1.5 times the inner diameter D of the intake valve seat, and the maximum distance L3 between the upper edge of the first flow guide curved surface portion 43 and the intake throat axis 22 is 0.8 to 2 times the inner diameter D of the intake valve seat.
Further preferably, the included angle between the second wall surface characteristic line 51 and the cylinder head bottom surface 6 is 40 ° to 80 °.
As shown in fig. 3, in another embodiment, when the flow guiding curved surface portion has the second layout structure, the following situation may be adopted: meanwhile, a plane passing through the axis 22 of the air inlet throat and the axis of the exhaust throat is a vertical characteristic surface, the intersection line of the second wall surface 5 and the vertical characteristic surface is a second wall surface characteristic line 51, and as the extending direction of the projection of the tumble flow guide air passage on the bottom surface 6 of the cylinder cover is consistent with the direction of the air inlet throat 2 towards the corresponding exhaust throat, the extending direction of the second wall surface characteristic line 51 is the extending direction of the second wall surface 5 of the tumble flow guide air passage. In this embodiment, the second wall surface characteristic line 51 is an arc line protruding toward the cylinder head bottom surface 6, so that the central line of the tumble flow guide air passage as a whole protrudes toward the cylinder head bottom surface 6, that is, the tumble flow guide air passage as a whole is bent toward the cylinder head bottom surface 6. So set up, the first section of second water conservancy diversion curved surface portion just can guide the air current that admits air to contralateral first water conservancy diversion curved surface portion 43 in, the air current that throws out by first water conservancy diversion curved surface portion 43 drops to inlet throat mouth 2 along the second water conservancy diversion curved surface portion's second section fast again, thereby aggravate the trend that the air current of admitting air moved to exhaust throat mouth direction, consequently, this scheme can make more gas guide to the arc pit of first wall 4 in, and can further improve tumble strength when reducing the energy loss of gas flow.
More preferably, the projected length L4 of the second wall surface 5 on the cylinder head bottom surface 6 is 0.5 to 3 times the intake valve seat inner diameter D, and specifically, the projected length L4 may be 0.5 times, or 1 times, or 1.5 times, or 2 times, or 3 times the intake valve seat inner diameter D.
As shown in fig. 4, in another specific embodiment, when the air guiding curved surface portion has the third layout structure, the third layout structure is: a first flow guiding curved surface part 43 and a second flow guiding curved surface part are distributed on the first wall surface 4 along the air inlet direction, the first flow guiding curved surface part 43 is an arc-shaped pit surface which is concave towards the direction of the bottom surface 6 of the cylinder cover relative to the first wall surface 4, the second flow guiding curved surface part is a flow guiding protruding part 7 which is positioned above the air inlet throat 2, the axial projection of the flow guiding protruding part 7 on the upper end surface of the air inlet throat 2 is a protruding projection 71, the protruding projection 71 is positioned on the inner side of the air inlet throat 2 and forms a protruding area which protrudes from the edge of the upper end surface of the air inlet throat 2 to the center of the air inlet throat 2 along the radial direction, and the width of the middle part of the protruding projection 71 in the circumferential direction of the air inlet throat 2 is larger than the width of the two ends of the protruding projection, as shown in fig. 5. Specifically, the upper side edge of the diversion protrusion 7 is connected with the lower side edge of the first diversion curved surface portion 43, and the lower side edge of the diversion protrusion 7 is connected with the upper side edge of the air inlet throat 2. In this scheme, after the air current that admits air flows through first water conservancy diversion curved surface portion 43, arc pit face casts the air current to offside second wall 5, the water conservancy diversion bulge 7 of arc pit face low reaches further makes the air current to 5 direction extrusions of second wall to the air current of flow direction exhaust throat mouth direction has been strengthened, the air current of exhaust throat mouth one side is kept away from to inlet throat mouth 2 has been reduced, this both sides air current forms stronger tumble motion after getting into cylinder 3, thereby satisfy gas engine's combustion demand.
Preferably, the minimum distance L6 of the guide projection 7 from the inlet throat axis 22 is greater than 0 and equal to or less than 0.5 times the inlet valve seat insert inner diameter D, specifically, the minimum distance L6 may be 0.1 times, or 0.2 times, or 0.3 times, or 0.4 times, or 0.5 times the inlet valve seat insert inner diameter D. The deepest part of the first flow guiding curved surface part 43 recessed relative to the first wall surface 4 is a recessed position point, the distance L5 between the recessed position point and the inlet throat axis 22 is 0.5-3 times of the inlet valve seat ring inner diameter D, specifically, the distance L5 may be 0.5 times, 0.6 times, 0.7 times, 0.8 times, 0.9 times, 1 times, 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2 times, 2.5 times, or 3 times of the inlet valve seat ring inner diameter D, the distance H2 between the recessed position point and the cylinder head bottom surface 6 is greater than 0 and less than or equal to the inlet valve seat ring inner diameter D, specifically, the distance H2 may be 0.1 times, 0.2 times, 0.3 times, 0.4 times, 0.5 times, 0.6 times, 0.7 times, 0.8 times, or 0.9 times of the inlet valve seat ring inner diameter D.
It should be noted that the flow guiding protrusion 7 in this embodiment is used to extrude a part of the intake airflow toward the exhaust throat before the intake airflow enters the intake throat 2, and the flow guiding protrusion 7 capable of implementing the above function may be designed in various structural shapes, for example, one side edge of the flow guiding protrusion 7 facing the center of the intake throat is designed in an arc shape, a straight shape, a broken line shape, or other curved structures. Preferably, the 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 intake throat 2, i.e. one side edge of the flow guiding protrusion 7 toward the center of the intake throat is designed into a concave arc shape.
It should be noted that the flow guide protrusion 7 specifically includes an upper flow guide surface and a lower processing surface, a junction of the upper flow guide surface and the lower processing surface is an edge of the flow guide protrusion 7 protruding toward the center of the air inlet throat, the lower processing surface is a 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 may specifically adopt casting processing, rotary cutting processing and the like, and according to different structures of the flow guide protrusion 7, the lower processing surface may specifically 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 processing surface in this embodiment is a rotary processing surface surrounding a processing axis, the processing axis may be designed to be coincident with, parallel to, or inclined relative to the intake throat axis 22, 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 bulge 7.
The rotary processing surface may be designed to have various different tapered surface structures according to different bus shapes, and preferably, the rotary processing surface in this embodiment is a conical processing surface, a processing axis of the conical processing surface coincides with the inlet throat axis 22, and a vertex of the conical processing surface is located above the inlet throat 2. The concrete shape of the flow guide protruding part 7 depends on the size of the conical angle of the conical processing surface, and the larger the conical angle is, the sharper the flow guide protruding part 7 is. Preferably, the taper angle of the conical processing surface in the scheme is in the range of 60-160 degrees, and in the range, the guide protrusion 7 can be ensured to have a sharp enough angle, so that the flow velocity mutation and the extrusion effect on the air flow are further strengthened.
The maximum flow port formed by the rotary machined surface in the upper end circular surface of the intake throat 2 is the theoretical intake flow port 23, that is, the axial projection of the circular contour formed by the conical bottom of the rotary machined surface after removing the material of the cylinder head body in the upper end circular surface of the intake throat 2 forms the theoretical intake flow port 23. When the processing axis of the rotary processing surface is coincident with or parallel to the axis of the air inlet throat 2, the theoretical air inlet flow port 23 is a circular flow port; when the machining axis of the rotary machined surface and the axis of the intake throat 2 are arranged relatively obliquely, the theoretical intake air flow port 23 is an elliptical flow port. Theoretical equivalent diameter of inlet flow port 23 is D 1 The 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, and in the scheme, D is 1 The relationship between D and D satisfies: d 1 When D is 0.85D to D, the 1 When the D is designed to be 85-100%, the circulation capacity and the tumble effect can be balanced, namely, the obvious tumble effect can be achieved under the condition of ensuring the minimum influence on the circulation capacity.
Referring to fig. 5, the total area of the theoretical intake air flow port 23 is S3, the area of the projected projection 71 is S1, and the flow guide protrusion 7 prevents partial airflow from passing through, so the area of the opening at the lower end of the tumble flow guide air passage for actual circulating airflow (i.e., the actual intake air flow port area S2 shown by the shaded portion in fig. 5) is equal to the total area S3 of the theoretical intake air flow port 23 minus the area S1 of the projected projection 71, i.e., S1, S2, and S3: s3 ═ S1+ S2.
The larger the area S1 of the projected projection 71, the more pronounced the effect of the flow guide projection 7 in blocking the air flow, and thus the greater the degree of squeezing of the air flow, i.e., the more pronounced the increase in the air flow velocity, the greater the intensity of the generated tumble flow. In order to balance the tumble effect and the air passage flow capacity, the present solution designs the area S1 of the projected projection 71 to be 15% -50% of the area S3 of the theoretical intake air flow port 23, that is, between S1 and S3, the following is satisfied: S1/S3 is 0.15-0.5.
Preferably, the connecting line between the midpoint of the connecting line 72 between the two ends of the convex projection 71 (as shown in fig. 5, the connecting line between the two end points P1 and P2) and the center of the air inlet throat is a convex direction line 73, and the included angle between the connecting line 24 between the center of the air inlet throat and the center of the exhaust throat and the convex direction line 73 is a convex direction angle β, as shown in fig. 6, the convex direction angle β in the present scheme is in the range of 0 ° to 45 °, so configured, the present scheme can arrange the convex side edge of the flow guide convex part 7 toward the adjacent exhaust throat, thereby controlling the large-scale tumble motion to fill the whole cylinder as much as possible. Wherein, the connecting line 24 of the inlet throat center and the exhaust throat center refers to the connecting line of the center of the inlet throat 2 and the exhaust throat center 8, as shown in fig. 6.
Preferably, the convex projection 71 spans an arc angle θ of 90 ° to 220 ° in the upper end face of the intake throat 2. This feature defines the extent of the span of the flow directing projection 7 in the cross-section of the tumble flow directing air passage.
It should be noted that the utility model provides a cylinder head can be applicable to two valve engine or multi-valve engine, namely, the quantity of inlet throat 2 can be one or two or three or more, and is corresponding, and every inlet throat 2 all corresponds and is connected with an intake duct 1, and the quantity of exhaust throat also can be one or two or more, and this paper is no longer repeated.
It should be noted that, for a cylinder head having two or three or more intake throats 2, the number of intake ports 1 is two or three or more, the respective intake ports 1 may be arranged to be separated from each other, or upstream portions of the respective intake ports 1 (i.e., an intake section located upstream of the tumble guide passage, a section near the intake port) may be communicated with each other to form an overall intake section.
It should be noted that, when the number of the inlet duct 1 in the present invention is two or three or more, the flow guiding curved surface portion in each inlet duct 1 may all adopt the same structure or arrangement, or may adopt different structures or arrangements, for example, for a cylinder head structure having two inlet ducts 1, two inlet ducts 1 are designed to be asymmetric structures, two arc-shaped pit surfaces may be provided on the first wall surface 4 in the tumble guiding air duct in one of the inlet ducts 1, one arc-shaped pit surface may be provided on the first wall surface 4 in the tumble guiding air duct in the other inlet duct 1, and the extension direction line of the second wall surface 5 is designed to be a convex arc line toward the cylinder head bottom surface 6, as shown in fig. 3.
It should be noted that the air inlet of the air inlet channel 1 is generally arranged on the side surface of the cylinder cover, and of course, the cylinder cover provided by the utility model can arrange the air inlet of the air inlet channel 1 on the top surface or the bottom surface of the cylinder cover, thereby facilitating the installation and arrangement of engines of different models.
The utility model also provides a gas engine of including above-mentioned cylinder head. The derivation process of the beneficial effects generated by the gas engine is substantially similar to the derivation process of the beneficial effects brought by the cylinder cover, and therefore, the description is omitted.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (14)

1. The utility model provides a cylinder head, includes intake duct, air inlet throat and exhaust throat, its characterized in that, being close to of intake duct one section of air inlet throat is tumble direction air flue, tumble direction air flue arranges for the cylinder head bottom surface slope, be close to of tumble direction air flue a lateral wall face of cylinder head bottom surface is first wall, in the tumble direction air flue with another lateral wall face that first wall is relative is the second wall, be equipped with in the tumble direction air flue and be used for guiding the air inflow to the water conservancy diversion curved surface portion of exhaust throat direction motion, water conservancy diversion curved surface portion is one of first overall arrangement structure, second overall arrangement structure and third overall arrangement structure, wherein:
the first layout structure is as follows: at least two arc-shaped pit surfaces which are sunken towards the bottom surface of the cylinder cover relative to the first wall surface are distributed on the first wall surface along the air inlet direction;
the second layout structure is as follows: a first flow guide curved surface part and a second flow guide curved surface part are arranged in the tumble guide air passage, the first flow guide curved surface part is an arc-shaped pit surface which is arranged on the first wall surface and is sunken towards the bottom surface of the cylinder cover relative to the first wall surface, the second wall surface which is arranged opposite to the first flow guide curved surface part forms the second flow guide curved surface part, and the second flow guide curved surface part is a smooth curved surface which is gradually close to the exhaust throat opening along the air inlet direction;
the third layout structure is as follows: the cylinder cover comprises a first wall surface and a second wall surface, wherein the first wall surface is provided with a first flow guide curved surface portion and a second flow guide curved surface portion along the air inlet direction, the first flow guide curved surface portion is an arc pit surface which is sunken towards the bottom surface direction of the cylinder cover relative to the first wall surface, the second flow guide curved surface portion is a flow guide protruding portion which is positioned above an air inlet throat, the axial projection of the flow guide protruding portion on the upper end surface of the air inlet throat is a protruding projection, the protruding projection is positioned on the inner side of the air inlet throat and forms a protruding area which protrudes from the edge of the upper end surface of the air inlet throat towards the center of the air inlet throat along the radial direction, and the width of the middle of the protruding projection is larger than the widths of two ends of the protruding projection.
2. The cylinder head according to claim 1, wherein when the air guiding curved surface portion is in the first layout structure, a lower side edge of a last one of the arc-shaped recess surfaces, which is distributed in an intake direction on the first wall surface, is connected to an upper side edge of the intake throat.
3. The cylinder cover according to claim 1 or 2, wherein when the flow guide curved surface portion is in the first layout structure, a first arc-shaped pit surface and a second arc-shaped pit surface are distributed on the first wall surface along the air inlet direction, the distance between the deepest position of the first arc-shaped pit surface relative to the first wall surface depression and the axis of the air inlet throat is 0.8-2.9 times of the inner diameter of the air inlet valve seat ring, and the distance between the deepest position of the second arc-shaped pit surface relative to the first wall surface depression and the axis of the air inlet throat is 0.2-1.6 times of the inner diameter of the air inlet valve seat ring.
4. The cylinder head of claim 1, wherein when the flow guide curved surface portion is the second layout structure, a lower side edge of the first flow guide curved surface portion and a lower side edge of the second flow guide curved surface portion are both contiguous with an upper side edge of the intake throat.
5. The cylinder head according to claim 1 or 4, wherein when the flow guide curved surface portion is the second layout structure, a plane passing through both the axis of the intake throat and the axis of the exhaust throat is a vertical feature surface, an intersection of the second wall surface and the vertical feature surface is a second wall surface feature line, and the second wall surface feature line is a straight line inclined with respect to the bottom surface of the cylinder head.
6. The cylinder head of claim 5, wherein the maximum distance between the second wall surface and the bottom surface of the cylinder head is 0.8 to 1.5 times the inner diameter of the intake valve seat ring, and the maximum distance between the upper side edge of the first flow guiding curved surface part and the axis of the intake throat is 0.8 to 2 times the inner diameter of the intake valve seat ring.
7. The cylinder head of claim 5, wherein the angle between the second wall surface feature line and the bottom surface of the cylinder head is between 40 ° and 80 °.
8. The cylinder head according to claim 1 or 4, wherein when the flow guide curved surface portion is the second layout structure, a plane parallel to both the axis of the intake throat and the axis of the exhaust throat is a vertical feature surface, an intersection of the second wall surface and the vertical feature surface is a second wall surface feature line, and the second wall surface feature line is an arc line that protrudes toward the bottom surface of the cylinder head.
9. The cylinder head of claim 8, wherein a projection of the second wall surface on the bottom surface of the cylinder head has a length of 0.5 to 3 times an inner diameter of an intake valve seat ring.
10. The cylinder head of claim 1, wherein the number of the inlet throats is one, two or three, and each inlet throat is correspondingly connected with one inlet channel.
11. The cylinder head of claim 1, wherein the number of intake ports is two or three, and each of the intake ports is arranged separately.
12. The cylinder head of claim 1, wherein the number of intake ports is two or three, and the flow guide curved surface portions in at least two of the intake ports are different.
13. The cylinder head of claim 1, wherein the intake port of the intake passage is disposed at a side surface or a top surface or a bottom surface of the cylinder head.
14. A gas engine, characterized by comprising a cylinder head according to any one of claims 1 to 13.
CN202123058910.XU 2021-08-19 2021-12-07 Cylinder cover and gas engine Active CN217481411U (en)

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Family Cites Families (9)

* Cited by examiner, † Cited by third party
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JP2010184312A (en) * 2009-02-10 2010-08-26 Toyota Motor Corp Intake port cutter
DE102014100568A1 (en) * 2014-01-20 2015-07-23 Tenedora Nemak, S.A. De C.V. Casting and insert for such a casting
CN205013163U (en) * 2015-08-31 2016-02-03 重庆长安汽车股份有限公司 Height rolls rascally says and engine
US10018106B2 (en) * 2016-10-21 2018-07-10 Ford Global Technologies, Llc Engine system with rotatable intake port
CN209212376U (en) * 2018-10-15 2019-08-06 奇瑞汽车股份有限公司 Supercharged direct injection engine intake duct
CN210509415U (en) * 2019-07-19 2020-05-12 重庆小康工业集团股份有限公司 Air inlet duct of engine cylinder head
JP7365201B2 (en) * 2019-11-12 2023-10-19 株式会社Subaru engine
CN111287862B (en) * 2020-05-13 2020-09-29 潍柴动力股份有限公司 Cylinder cover and gas engine
CN111287860B (en) * 2020-05-13 2020-09-29 潍柴动力股份有限公司 Weak tumble fast combustion system and gas engine

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