CN216922303U - Premixed gas engine piston and engine - Google Patents
Premixed gas engine piston and engine Download PDFInfo
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- CN216922303U CN216922303U CN202220391128.5U CN202220391128U CN216922303U CN 216922303 U CN216922303 U CN 216922303U CN 202220391128 U CN202220391128 U CN 202220391128U CN 216922303 U CN216922303 U CN 216922303U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The utility model discloses a premixed gas engine piston and an engine, wherein the premixed gas engine piston comprises a piston body, an inward concave combustion chamber is arranged at the upper part of the piston body, the diameter of the top of the combustion chamber is larger than that of the bottom of the combustion chamber, and the section of the combustion chamber along the center line of the piston body is in an isosceles trapezoid shape; a first ring land is arranged on the outer wall of the piston body, and the ratio of the diameter of the piston body to the height of the first ring land is 1: (0.17-0.18), wherein the height of the first land refers to the distance between the top of the first land and the top wall of the piston body. According to the premixed gas engine piston, the transitional turbulent interference generated in the combustion chamber can be avoided, the high-temperature field of the combustion chamber can be effectively isolated, the heat radiation of the piston body is greatly reduced, and the total height of the piston body is shortened.
Description
Technical Field
The utility model relates to the technical field of engines, in particular to a premixed gas engine piston and an engine.
Background
With the development of electronic technology, a microprocessor accurately controls the gas flow, the air-fuel ratio, the ignition time and the like of the engine, so that the lean-burn engine becomes energy-saving and emission-reducing standard equipment of a high-technology gas engine. Therefore, in order to achieve higher performance indexes such as air-fuel ratio, detonation pressure and the like, the structure and the bearing capacity of the combustion chamber are also tested sharply, and more rigorous requirements are put forward on the design of the combustion chamber.
In the prior art, most of engine piston combustion chambers are improved and developed on the basis of diesel engines, the aim of homogenizing and accelerating the combustion speed is achieved by transiting to pursue the combustion chamber structure to intensify the turbulence phenomenon of mixed airflow, and the air charging efficiency is reduced; meanwhile, because the combustion temperature of the gas engine is higher than that of a diesel engine, the temperature generated by gas combustion is higher when higher density power is adopted, the heat radiation to a piston and a piston ring is worse, the height of the first ring bank of most of the pistons is too large at present, the heat radiation to the piston body by a high-temperature field of a combustion chamber cannot be cut off as early as possible, the thermal stress of the head of the piston is large, and the requirements on high index and long service life cannot be met.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a premixed gas engine piston and an engine, which can avoid the turbulence interference generated in the combustion chamber, effectively isolate the high temperature field of the combustion chamber, greatly reduce the thermal radiation of the piston body, and simultaneously shorten the total height of the piston body.
In order to achieve the above object, the present invention provides a premixed gas engine piston comprising: the piston comprises a piston body, wherein an inwards concave combustion chamber is arranged at the upper part of the piston body, the diameter of the top of the combustion chamber is larger than that of the bottom of the combustion chamber, and the section of the combustion chamber along the center line of the piston body is in an isosceles trapezoid shape;
a first ring land is arranged on the outer wall of the piston body, and the ratio of the diameter of the piston body to the height of the first ring land is 1: (0.17-0.18), wherein the height of the first land refers to the distance between the top of the first land and the top wall of the piston body.
In some embodiments, the ratio of the diameter of the piston body to the top diameter of the combustion chamber is 1: (0.65-0.68);
and/or the ratio of the diameter of the piston body to the height of the combustion chamber is 1: (0.2-0.21);
and/or the included angle formed by the two side edges of the isosceles trapezoid is 30-40 degrees.
In some embodiments, the side wall of the combustion chamber interfaces with the top wall of the piston body with a smooth transition.
In some embodiments, the intersection of the side wall of the combustion chamber and the top wall of the piston body is provided with a radius R1The diameter and R of the piston body1The ratio of 1: (0.01-0.02).
In some embodiments, the side wall of the combustion chamber meets the bottom wall of the combustion chamber with a smooth transition.
In some embodiments, the intersection of the sidewall of the combustion chamber and the bottom wall of the combustion chamber is provided with a radius R2The diameter and R of the piston body2The ratio of 1: (0.07-0.1).
In some embodiments, a piston top cooling gallery is further provided in the interior of the piston body, the piston top cooling gallery being disposed between the combustion chamber and the first land.
In some embodiments, the ratio of the diameter of the piston body to the height of the piston top cooling gallery is 1: (0.1-0.11), wherein the height of the piston top cooling oil passage is the distance between the top of the piston top cooling oil passage and the top wall of the piston body.
In some embodiments, the premix gas engine piston is a one-piece structure integrally formed from a heat resistant alloy.
According to another aspect of the utility model, the utility model further provides an engine comprising the premixed gas engine piston described above.
Compared with the prior art, the premixed gas engine piston and the engine provided by the utility model have the following beneficial effects:
1. the piston of the premixed gas engine provided by the utility model realizes high-efficiency combustion in the working and using process of the premixed gas engine, can be suitable for the application with the high index requirements of average effective pressure of 16bar, detonation pressure of 140bar, lean combustion (air-fuel ratio of 1.68) and above, effectively avoids the abnormal phenomena of detonation, fire and the like, and has the remarkable characteristics of energy conservation and emission reduction;
2. the premixed gas engine piston provided by the utility model can not aggravate the turbulent flow of the waste gas flow in the waste gas exhaust process after the combustion is finished, the waste gas in the combustion chamber can be smoothly exhausted through the exhaust valve, and meanwhile, the waste gas in the spark plug pre-combustion chamber can be exhausted under the driving of the exhaust kinetic energy because of no transitional turbulent flow interference; the arrangement of the first ring bank can effectively isolate a high-temperature field of the combustion chamber as early as possible, greatly reduce the heat radiation of the piston body and shorten the total height of the piston body.
Drawings
The above features, technical features, advantages and modes of realisation of the present invention will be further described in the following detailed description of preferred embodiments thereof, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic illustration of a preferred embodiment of a premix gas engine piston according to the present invention;
FIG. 2 is a schematic size diagram of a premixed gas engine piston according to a preferred embodiment of the present invention.
The reference numbers illustrate:
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the utility model, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, only the parts related to the utility model are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.
In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present application, the terms "first," "second," and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In one embodiment, referring to fig. 1 and 2 of the specification, the utility model provides a premixed gas engine piston, comprising: the piston body 1, the upper portion of piston body 1 is provided with interior concavity combustion chamber 2, the top diameter of combustion chamber 2 is greater than the bottom diameter of combustion chamber 2, and the combustion chamber2 the section along the center line of the piston body is an isosceles trapezoid; the outer wall of the piston body 1 is provided with a first ring land 3, the first ring land 3 is also the activity land of the piston, the diameter D of the piston body and the height h of the first ring land2The ratio of 1: (0.17-0.18), wherein the height h of the first land2Which refers to the distance between the top of the first land 3 and the top wall of the piston body 1.
In the embodiment, when in actual use, natural gas (methane, landfill gas, coal bed gas and the like) and air are mixed uniformly in advance in the low-pressure air inlet main pipe through the mixer, are pressurized through the supercharger compressor and are cooled through the intercooler, and then are distributed to each cylinder through the air inlet main pipe; the piston of the premixed gas engine effectively utilizes the kinetic energy of the pressurized mixed gas in the air inlet main pipe in the air inlet process of the cylinder to generate proper mixed gas turbulence in the combustion chamber 2, so that as much fresh mixed gas as possible enters the combustion chamber 2, and the air charging efficiency is improved; meanwhile, due to the fact that transitional turbulent flow interference does not exist, the mixed gas is filled in the spark plug pre-combustion chamber to wait for ignition. The premixed gas engine piston is in the burning end waste gas exhaust in-process, because this special construction can not aggravate the turbulent flow of waste gas air current, can unobstructed exhaust combustion chamber 2 interior waste gas of exhaustion valve, simultaneously, because the turbulent flow interference of transition does not have, the spark plug precombustion indoor waste gas also can be exhausted under the drive of exhaust kinetic energy. The special arrangement of the first ring land 3 can effectively isolate the high temperature field of the combustion chamber 2 as early as possible, greatly reduce the heat radiation of the piston body 1 and shorten the total height of the piston body 1. By adopting the novel basin-type combustion chamber structure and the piston of the premixed supercharged intercooling gas engine with the characteristics of small first ring land height and the like, high-efficiency combustion is realized in the working and using process of the premixed gas engine, the piston can be suitable for the application of average effective pressure of 16bar, detonation pressure of 140bar, lean combustion (air-fuel ratio of 1.68) and above high index requirements, the abnormal phenomena of detonation, fire catching and the like are effectively avoided, and the piston has the remarkable characteristics of energy conservation and emission reduction.
In one embodiment, referring to the drawings 1 and 2 of the specification, the ratio of the diameter D of the piston body to the top diameter D of the combustion chamber is 1: (0.65-0.68), for example, the ratio of the diameter D of the piston body to the diameter D of the top of the combustion chamber is 1:0.66, 1:0.67, etc. Diameter D of piston body and combustion chamberHeight h3The ratio of 1: (0.2-0.21), e.g. the diameter D of the piston body and the height h of the combustion chamber3The ratio of 1:0.2, 1:0.205, 1:0.21, etc. The angle alpha formed by the combustion chamber along the two sides of the section of the center line of the piston body is 30-40 degrees, for example, the angle alpha formed by the combustion chamber along the two sides of the section of the center line of the piston body is 33 degrees, 34 degrees, 35 degrees, 36 degrees, etc. When the premixed gas engine piston of the embodiment is at a compression top dead center, the volume of the combustion chamber 2 is ensured to meet the performance index requirements of compression pressure, explosion pressure and the like, and the piston connecting rod mechanism is driven to do work by bearing combustion thrust with enough stressed area.
In one embodiment, referring to the attached fig. 1 and fig. 2 of the specification, the junction between the side wall of the combustion chamber 2 and the top wall of the piston body 1 is smoothly transited, and the junction between the side wall of the combustion chamber 2 and the top wall of the piston body 1 is provided with a radius R1The diameter D of the piston body and the radius R of the fillet at the joint of the side wall of the combustion chamber and the top wall of the piston body1The ratio of 1: (0.01-0.02), the top surface of the piston body 1 and the side wall of the combustion chamber 2 adopt smooth transition small arcs, and stress concentration is avoided under the condition that the shape of the combustion chamber 2 is not changed as much as possible. The joint of the side wall of the combustion chamber 2 and the bottom wall of the combustion chamber 2 is in smooth transition, and the radius R is set at the joint of the side wall of the combustion chamber 2 and the bottom wall of the combustion chamber 22The diameter D of the piston body and the radius R of the fillet at the joint of the side wall of the combustion chamber and the bottom wall of the combustion chamber2The ratio of 1: (0.07-0.1), the bottom wall of the combustion chamber 2 and the side wall of the combustion chamber 2 adopt smooth transition large arcs, and under the condition that the shape of the combustion chamber 2 is changed as much as possible, the processing and the forming are facilitated, and the stress concentration is avoided; through the smooth transition connecting structure, the flame can burn more fully and smoothly in the combustion chamber.
In one embodiment, referring to the attached fig. 1 and fig. 2 of the specification, the piston body 1 is further provided with a piston top cooling oil passage 4 in the inner part, and the piston top cooling oil passage 4 is arranged between the combustion chamber 2 and the first land 3. Diameter D of piston body and height h of piston top cooling oil channel1The ratio of 1: (0.1-0.11), wherein the height h of the cooling oil passage at the top of the piston1Refers to the distance between the top of the piston top cooling oil passage 4 and the top wall of the piston body 1And (5) separating. Not only improve the burning, reduce the emission of harmful thing through the reduction of first ring bank 3 height, can also improve the heat dissipation situation at piston top, reduce piston top temperature. However, since the smaller the height of the first land 3, the higher the thermal load of the first ring groove, the piston crown cooling gallery 4 is provided at the first ring groove and the piston crown which are as close as possible to the high heat-stress region at the crown of the piston body 1, and the head portion of the piston body 1 is effectively cooled, thereby maintaining a good operating state.
In one embodiment, referring to the attached fig. 1 and 2 of the specification, the piston of the premixed gas engine is of a one-piece structure and is integrally formed through heat-resistant alloy. The piston of this structure is integrated structure, makes the intensity of whole piston body promote greatly, improves life.
According to another aspect of the utility model, the utility model further provides an engine comprising a premix gas engine piston as described above. When the engine of the embodiment compresses the top dead center, the volume of the combustion chamber 2 is ensured to meet the performance index requirements of compression pressure, explosion pressure and the like, and the engine has enough stressed area to bear combustion thrust to drive the piston connecting rod mechanism to do work. Combustion eddy current loss can be reduced, and the combustion process is closer to the flame propagation rule, so that flame propagation is faster, and combustion is more complete; the engine obtains more reasonable compression ratio, and the dynamic property and the economical efficiency of the engine are effectively improved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or recited in detail in a certain embodiment.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. A premixed gas engine piston, comprising: the piston comprises a piston body, wherein an inwards concave combustion chamber is arranged at the upper part of the piston body, the diameter of the top of the combustion chamber is larger than that of the bottom of the combustion chamber, and the section of the combustion chamber along the center line of the piston body is in an isosceles trapezoid shape;
a first ring land is arranged on the outer wall of the piston body, and the ratio of the diameter of the piston body to the height of the first ring land is 1: (0.17-0.18), wherein the height of the first land refers to the distance between the top of the first land and the top wall of the piston body.
2. The premix gas engine piston of claim 1,
the ratio of the diameter of the piston body to the diameter of the top of the combustion chamber is 1: (0.65-0.68);
and/or the ratio of the diameter of the piston body to the height of the combustion chamber is 1: (0.2-0.21);
and/or the included angle formed by the two side edges of the isosceles trapezoid is 30-40 degrees.
3. The premix gas engine piston of claim 2,
the junction of the side wall of the combustion chamber and the top wall of the piston body is in smooth transition.
4. The premix gas engine piston of claim 3,
the joint of the side wall of the combustion chamber and the top wall of the piston body is provided with a radius R1The diameter and R of the piston body1The ratio of 1: (0.01-0.02).
5. The premix gas engine piston of claim 2,
the junction of the side wall of the combustion chamber and the bottom wall of the combustion chamber is in smooth transition.
6. The premix gas engine piston of claim 5,
the radius of the joint of the side wall of the combustion chamber and the bottom wall of the combustion chamber is R2The diameter and R of the piston body2The ratio of 1: (0.07-0.1).
7. The premix gas engine piston of claim 1,
and a piston top cooling oil channel is further arranged in the piston body and arranged between the combustion chamber and the first ring land.
8. The premix gas engine piston of claim 7,
the ratio of the diameter of the piston body to the height of the piston top cooling oil passage is 1: (0.1-0.11), wherein the height of the piston top cooling oil passage is the distance between the top of the piston top cooling oil passage and the top wall of the piston body.
9. The premix gas engine piston of claim 1,
the premixed gas engine piston is of an integrated structure and is integrally formed by heat-resistant alloy.
10. An engine comprising a premixed gas engine piston according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220391128.5U CN216922303U (en) | 2022-02-24 | 2022-02-24 | Premixed gas engine piston and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220391128.5U CN216922303U (en) | 2022-02-24 | 2022-02-24 | Premixed gas engine piston and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216922303U true CN216922303U (en) | 2022-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220391128.5U Active CN216922303U (en) | 2022-02-24 | 2022-02-24 | Premixed gas engine piston and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216922303U (en) |
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2022
- 2022-02-24 CN CN202220391128.5U patent/CN216922303U/en active Active
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