CN212985390U - Piston for gas engine and gas engine with same - Google Patents

Abstract

The utility model belongs to the technical field of the engine, the utility model provides a piston for gas engine, the top of piston is equipped with circular pit, follows the circumference direction of circular pit is equipped with a plurality of water conservancy diversion slopes, a plurality of water conservancy diversion slopes are central symmetric distribution, the water conservancy diversion slope certainly the lateral wall of circular pit towards the center of circular pit extends, the middle part of circular pit is equipped with the arch. The utility model provides a piston for gas engine is equipped with circular pit at the top, be equipped with a plurality of water conservancy diversion slopes that are central symmetry in the circular pit, the ascending direction on water conservancy diversion slope is unanimous with air flue whirl direction to strengthen vertical air velocity, accelerate flame propagation speed, promote the gas utilization ratio, and the middle part of circular pit is equipped with the arch, and it is regional to reduce the gas low velocity of flow of pit bottom.

Description

Piston for gas engine and gas engine with same

Technical Field

The utility model belongs to the technical field of the engine, concretely relates to a piston for gas engine. The utility model discloses still relate to a gas engine.

Background

This section provides background information related to the present disclosure only and is not necessarily prior art.

The existing gas engine piston is generally improved on the basis of a diesel engine piston, and a shallow basin-shaped structure is mostly adopted in a combustion chamber. Due to the existence of large-scale vortex, the vortex can be similar to rigid circular motion, so that the turbulent kinetic energy in the cylinder is maintained at a high level, but the large-scale flow can influence the flame development form and has high cyclic variation. Owing to the squish flow movement, the flame transverse propagation speed is high, but the longitudinal speed in the combustion chamber is low, and the flame longitudinal propagation speed is low. In addition, the piston crown is poorly cooled in the area along the piston crown, which is a high risk of detonation. In high speed, high load areas, squish flow may blow out fire nuclei, adversely affecting fire stability.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the gas engine piston combustion performance is poor among the prior art at least, this purpose is realized through following technical scheme:

the utility model discloses a first aspect provides a piston for gas engine, the top of piston is equipped with circular pit, follows the circumference direction of circular pit is equipped with a plurality of water conservancy diversion slopes, a plurality of water conservancy diversion slopes are central symmetric distribution, the water conservancy diversion slope certainly the lateral wall of circular pit towards the center of circular pit extends, the middle part of circular pit is equipped with the arch.

The utility model provides a piston for gas engine is equipped with circular pit at the top, be equipped with a plurality of water conservancy diversion slopes that are central symmetry in the circular pit, the ascending direction on water conservancy diversion slope is unanimous with air flue whirl direction to strengthen vertical air velocity, accelerate flame propagation speed, promote the gas utilization ratio, and the middle part of circular pit is equipped with the arch, and it is regional to reduce the gas low velocity of flow of pit bottom.

In addition, according to the present invention, the piston for a gas engine may further have the following additional technical features:

in some embodiments of the present invention, the diversion slope includes a slope top surface and a slope side surface connected to one side of the slope top surface, the width of the slope top surface is gradually increased from the top end of the slope top surface to the bottom end of the slope top surface, the height of the slope side surface is gradually decreased from being close to one end of the side wall surface of the circular pit to being close to one end of the center of the circular pit.

In some embodiments of the present invention, the protrusion is a hemispherical protrusion.

In some embodiments of the invention, the bottom end of the diversion slope is embedded in the protrusion.

In some embodiments of the present invention, the diameter of the circular recess increases gradually from the bottom end to the top end.

In some embodiments of the present invention, the top surface of the piston is further provided with a plurality of flow guiding grooves along the circumferential direction of the piston.

In some embodiments of the present invention, the corners and corners of the piston are chamfers or fillets.

In some embodiments of the present invention, a cooling oil passage is provided in the piston.

A second aspect of the present invention provides a gas engine, comprising:

the cylinder body is provided with a plurality of cylinders;

a plurality of pistons, the piston does the utility model discloses a piston for gas engine that the first aspect provided, a plurality of pistons assemble with the mode of one-to-one the cylinder body in a plurality of cylinders.

The utility model discloses the gas engine that the second aspect provided have with the utility model discloses the same beneficial effect of piston for gas engine that the first aspect provided, no longer give unnecessary details here.

The utility model discloses an in some embodiments, gas engine still includes the cylinder cap, the cylinder cap is equipped with the intake duct, the ascending direction on water conservancy diversion slope with the whirl direction of intake duct is unanimous.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:

fig. 1 schematically shows a cross-sectional schematic view of a piston for a gas engine according to an embodiment of the present invention;

fig. 2 schematically shows a schematic structural view of a piston for a gas engine according to an embodiment of the present invention;

fig. 3 schematically shows a schematic top view of a piston for a gas engine according to an embodiment of the present invention;

figure 4 schematically shows a plot of the in-cylinder swirl of a calibrated point for a piston of a gas engine as a function of crankshaft angle of rotation according to an embodiment of the present invention;

FIG. 5 schematically illustrates a plot of calibrated in-cylinder turbulence energy as a function of crankshaft rotational angle for a piston of a gas engine according to an embodiment of the present invention;

the reference symbols in the drawings denote the following:

10: piston, 11: circular pit, 111: pit side wall, 12: diversion slope, 121: ramp side, 122: slope top surface, 13: projection, 14: guiding gutter, 15: a cooling oil passage;

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "second" and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, an element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "inner", "side", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

As shown in fig. 1 and 2, the first aspect of the present invention provides a piston 10 for a gas engine, wherein the top of the piston 10 is provided with a circular recess 11, a plurality of diversion slopes 12 are arranged along the circumferential direction of the circular recess 11, the diversion slopes 12 are distributed in a central symmetry manner, the diversion slopes 12 extend from the side wall 111 of the circular recess 11 toward the center of the circular recess 11, and the middle of the circular recess 11 is provided with a protrusion 13.

The utility model provides a piston 10 for gas engine is equipped with circular pit 11 at the top, is equipped with a plurality of water conservancy diversion slopes 12 that are central symmetry in the circular pit 11, and the ascending direction and the air flue whirl direction of water conservancy diversion slope 12 are unanimous to strengthen vertical air velocity, accelerate flame propagation speed, promote the gas utilization ratio, and the middle part of circular pit 11 is equipped with arch 13, in order to reduce the gas low velocity of flow region bottom the pit.

As shown in fig. 4 and 5, select the calibration point for calculating the operating mode, utilize three-dimensional simulation to calculate the former scheme that the software contrast did not set up water conservancy diversion slope 12 with the utility model discloses the scheme, according to the simulation result, the calibration point is at the moment of lighting a fire (-30 °), the utility model discloses the vortex ratio of scheme and jar interior turbulent kinetic energy all are obviously higher than former scheme, this is because the utility model discloses the water conservancy diversion slope 12 of scheme can effectively strengthen jar interior vortex to help breaking into the small-scale torrent, the arch 13 of bottom has reduced the air current low-speed region of flowing simultaneously, and jar interior turbulent kinetic energy also obviously improves, plays positive effectual promotion to flame propagation and combustion speed homoenergetic to improve gas engine thermal efficiency.

In some embodiments of the present invention, the diversion slope 12 includes a slope top surface 122 and a slope side surface 121 connected to one side of the slope top surface 122, the width of the slope top surface 122 gradually increases from the top end of the slope top surface 122 to the bottom end of the slope top surface 122, and the height of the slope side surface 121 gradually decreases from the end close to the side wall 111 of the circular pit 11 to the end close to the center of the circular pit 11. The flow guiding slope 12 with the structure enables the ascending direction of the flow guiding slope 12 to be consistent with the rotational flow direction of the air passage, and longitudinal air flow speed is enhanced.

In some embodiments of the present invention, the protrusions 13 are hemispherical protrusions 13. The hemispherical protrusions 13 can increase the gas flow rate at the bottom of the circular pits 11 and reduce thermal stress.

In some embodiments of the present invention, the bottom end of the diversion slope 12 is embedded in the protrusion 13. The combination of the diversion slope 12 and the bulge 13 can improve the flow speed of the air flow and reduce the low-flow-speed area of the fuel gas.

In some embodiments of the present invention, the diameter of the circular recess 11 increases gradually from the bottom end to the top end. The top diameter of the circular pit 11 is larger, forming an open feature for reducing squish flow strength, improving ignition stability, and reducing the risk of detonation.

In some embodiments of the present invention, the top surface of the piston 10 is further provided with a plurality of guiding grooves 14 along the circumferential direction of the piston 10. The flow rate of gas over the top surface of the piston 10 is enhanced by the provision of channels 14.

In some embodiments of the present invention, the corners and corners of the piston 10 are chamfers or fillets. And rounding off each edge and corner to prevent overlarge thermal stress.

In some embodiments of the present invention, a cooling gallery 15 is provided in the piston 10. The cooling oil duct 15 is arranged in the piston at a position close to the lower part of the circular pit 11 to improve the cooling effect on the combustion chamber, the cooling oil duct 15 is communicated with the bottom of the piston 10 through an oil inlet duct and an oil outlet duct to be connected into a cooling oil circulation system, and in work, the piston 10 is cooled through circulating cooling oil in the cooling oil duct 15.

The second aspect of the present invention provides a gas engine, including:

the cylinder body is provided with a plurality of cylinders;

a plurality of pistons 10, piston 10 do the utility model discloses a piston 10 for gas engine that first aspect provided, a plurality of pistons 10 assemble in a plurality of cylinders of cylinder body with the mode of one-to-one.

The utility model discloses the gas engine that the second aspect provided have with the utility model discloses the same beneficial effect of piston 10 for gas engine that the first aspect provided, no longer describe herein.

The utility model discloses an in some embodiments, gas engine still includes the cylinder cap, and the cylinder cap is equipped with the intake duct, and the ascending direction of water conservancy diversion slope 12 is unanimous with the whirl direction of intake duct to make water conservancy diversion slope 12 carry out the water conservancy diversion to the gas that the intake duct got into, thereby strengthen air current longitudinal flow rate.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a piston for gas engine, its characterized in that, the top of piston is equipped with circular pit, follows the circumference direction of circular pit is equipped with a plurality of water conservancy diversion slopes, a plurality of water conservancy diversion slopes are central symmetric distribution, the water conservancy diversion slope certainly the lateral wall of circular pit towards the center of circular pit extends, the middle part of circular pit is equipped with the arch.

2. The piston for a gas engine as claimed in claim 1, wherein said flow guiding slope includes a slope top surface and a slope side surface connected to one side of said slope top surface, a width of said slope top surface gradually increases from a top end of said slope top surface to a bottom end of said slope top surface, and a height of said slope side surface gradually decreases from one end close to said side wall surface of said circular recess to one end close to said center of said circular recess.

3. The piston for a gas engine as claimed in claim 1, wherein said projection is a hemispherical projection.

4. The piston for a gas engine as claimed in claim 1, wherein a bottom end of said guide slope is embedded in said boss.

5. A piston for a gas engine according to any one of claims 1 to 4, wherein the diameter of said circular depression gradually increases from the bottom end to the top end.

6. The piston for a gas engine according to any one of claims 1 to 4, wherein a top surface of the piston is provided with a plurality of guide grooves in a circumferential direction of the piston.

7. The piston for a gas engine as recited in any one of claims 1 to 4, wherein corners and corners of said piston are chamfered or rounded.

8. A piston for a gas engine according to any one of claims 1 to 4, wherein a cooling gallery is provided in the piston.

9. A gas engine, characterized in that the gas engine comprises:

the cylinder body is provided with a plurality of cylinders;

a plurality of pistons according to any one of claims 1 to 8 fitted in a one-to-one correspondence in the plurality of cylinders of the cylinder block.

10. The gas engine as claimed in claim 9, further comprising a cylinder head provided with an intake port, wherein an upward direction of the guide slope coincides with a swirling direction of the intake port.

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