CN112832892A

CN112832892A - Marine low-speed diesel engine piston cooling oil jet disc and piston

Info

Publication number: CN112832892A
Application number: CN201911156874.5A
Authority: CN
Inventors: 罗茂林; 冯梓怡; 马龙斌; 孙云峰
Original assignee: Hudong Heavy Machinery Co Ltd
Current assignee: Hudong Heavy Machinery Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2021-05-25

Abstract

The invention discloses a cooling oil injection disc and a piston for a marine low-speed diesel engine piston, wherein a groove and an injection hole are formed in the injection disc, the injection hole is communicated with the groove, and the piston comprises the injection disc. The cooling oil injection disc for the marine low-speed diesel engine piston, disclosed by the invention, has the advantages of simple and ingenious structure, capability of efficiently cooling the piston, improved cooling effect, convenience in installation, simplicity in disassembly, assembly and maintenance and contribution to popularization and application.

Description

Marine low-speed diesel engine piston cooling oil jet disc and piston

Technical Field

The invention relates to a cooling oil injection disc and a piston of a marine low-speed diesel engine piston.

Background

In the running process of the marine low-speed diesel engine, the piston head can directly contact high-temperature and high-pressure fuel gas, so the piston head must be fully cooled, the cooling structure of the piston head is generally complex and various, the cooling effect is not ideal, the installation is unstable, and a large improvement space exists.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a cooling oil injection disc and a piston of a marine low-speed diesel engine piston.

The purpose of the invention is realized by adopting the following technical scheme:

a cooling oil injection disk for a piston of a marine low-speed diesel engine is provided with a groove and injection holes, and the injection holes are communicated with the groove. Through adopting above-mentioned technical scheme, directly set up the jet orifice on the injection dish, compare in other scheme through setting up the injection pipe, the design of jet orifice can direct the injection with cooling oil directly high-efficiently, and avoided the inconvenient unstability of installation of injection pipe, cools off not good problem, can carry out high-efficient cooling to the piston head, and the installation is firm, long service life, also be convenient for change. The design of the groove faces to one side of the cooling oil pipe when the groove is arranged on the piston, so that the cooling oil from the cooling oil pipe is gathered and sprayed out through the spray hole, and the whole spraying process is smooth and convenient to seal.

Preferably, the central position of the injection plate is provided with injection holes, the injection holes around the central position are also provided with a plurality of injection holes on the injection plate. Through adopting above-mentioned technical scheme, around the jet orifice of central point position, set up a plurality of other jet orifices, be favorable to utilizing the space of injection dish all-roundly, also make the recess space obtain rational utilization, can make all directions all have the injection of cooling oil, promote the cooling effect.

Preferably, the plurality of injection holes are arranged in an inclined manner expanding from one side of the groove to the other side of the groove. Through adopting above-mentioned technical scheme, be the slope form, also be the jet orifice of expansion form, be favorable to the natural injection of cooling oil, be favorable to leading cooling oil to all directions and angle, effectively improve cooling effect and efficiency.

Preferably, the plurality of injection holes are arranged in a circumferential array around the injection hole at the central position, and are at least distributed as a first circumferential array injection hole and a second circumferential array injection hole. Through adopting above-mentioned technical scheme, at least two circles are the jet orifice that the circumference array distributes, can make the space of whole injection dish obtain reasonable make full use of, and set up simply ingenious reasonable, also the processing of being convenient for.

Preferably, the inclination degree of the first circular array injection holes is smaller than that of the second circular array injection holes, the first circular array injection holes are located at the inner ring, and the second circular array injection holes are located at the outer ring. Through adopting above-mentioned technical scheme, the degree of inclination of the jet orifice of outer lane is greater than the degree of inclination of the jet orifice of inner circle, is favorable to combining the structural feature of jet disk itself, is the divergent formula with cooling oil and guides the injection to each corner fully.

Preferably, the injection tray is further provided with a fixing hole, and the fixing hole is located on the periphery of the groove. Through adopting above-mentioned technical scheme, the setting of fixed orifices is favorable to the fixed of injection dish, is in the periphery of recess, can not exert an influence to the setting of jet orifice, has guaranteed the cooling effect to the at utmost.

Preferably, the outer edge of the spray disk is circular, the cross section of the groove wall of the groove is circular, and the groove is arranged in the center of the spray disk. Through adopting above-mentioned technical scheme, recess and the concentric setting of injection dish are favorable to overall structure's overall arrangement, make whole compact structure ingenious, are favorable to the installation.

A piston comprises the cooling oil injection disc for the marine low-speed diesel engine piston, and further comprises a piston head, a piston skirt and a piston rod, wherein the piston skirt is installed on the periphery of the piston rod, the piston head is installed above the piston skirt and the piston rod, a cooling oil pipe penetrates through the piston rod, a flange is installed at the tail end of the cooling oil pipe, the injection disc is installed on the flange, a groove is formed in one side, close to the cooling oil pipe, of the groove, a first cavity is formed in the piston head, and the injection disc is located in the first cavity. Through adopting above-mentioned technical scheme, the piston adopts this injection dish, sprays the dish and installs on the flange, and the recess is close to cooling oil pipe place one side, and the recess is to cooling oil pipe's oil-out promptly, can assemble the cooling oil that cooling oil pipe end came out and spray to first cavity in, directly and high-efficiently cooling the piston head formation.

Preferentially, the first cavity is columnar, the piston head is further provided with an annular second cavity, the first cavity and the second cavity are communicated through a first through hole, a gap is formed between the inner wall of the piston rod and the outer wall of the cooling oil pipe, the piston rod is provided with a second through hole, and the second through hole is communicated with the gap and the second cavity. By adopting the technical scheme, through the communicated arrangement of each cavity and each through hole, the cooling oil can fully and efficiently cool the piston head, particularly, the first cavity at the central position is columnar, the structural shape of the piston head is fully utilized, most of the piston head can be directly and fully cooled, the second cavity is annular, the peripheral piston head part can be fully cooled, and the arrangement of the injection disc combines the shapes and the structural arrangement of each cavity, so that a loop of the cooling oil is effectively optimized, and the cooling effect is improved.

Preferably, the top surface of the spray disk is lower than the lower end of the first through hole. Through adopting above-mentioned technical scheme, the top surface of jet disk is less than the lower extreme of first through-hole, is favorable to cooling oil to get into first through-hole on the one hand, and on the other hand, because of the piston is the motion, does not hinder the oscillatory motion of cooling oil in first cavity yet, is favorable to all-round cooling the piston head.

Compared with the prior art, the invention has the beneficial effects that: the injection plate is provided with the injection hole and is arranged on the flange at the tail end of the cooling oil pipe, the injection hole can directly and efficiently guide the cooling oil to be injected into the first cavity to efficiently cool the piston head, and the injection plate is convenient and firm to arrange on the flange, long in service life and convenient to replace. The cooling effect of the piston adopting the injection disk is obviously improved.

Drawings

Fig. 1 is a schematic top view of a cooling oil injection plate of a marine low-speed diesel engine piston according to embodiment 1 of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is a schematic view of a piston including a marine low speed diesel engine piston cooling oil jet disk according to embodiment 2 of the present invention;

fig. 4 is a schematic view of an oil path direction of cooling oil for a piston according to embodiment 2 of the present invention.

In the figure: 1. a spray tray; 11. an injection hole; 12. a fixing hole; 13. a groove; 2. cooling the oil pipe; 3. a piston rod; 31. a second through hole; 4. a piston head; 40. a first through hole; 41. a first cavity; 42. a second cavity; 5. a piston skirt; 6. and (4) a flange.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "plurality" means two or more unless specifically limited otherwise; the terms "mounted," "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Example 1

The utility model provides a marine low-speed diesel engine piston cooling oil sprays dish, installs in the piston, refer to fig. 1 to 3, has seted up jet orifice 11 on spraying dish 1, and the outer fringe of spraying dish 1 is circular, and its bottom has recess 13, and recess edge shape is circular, and both set up with one heart, and the recess sets up the central point in spraying dish promptly, and jet orifice 11 intercommunication recess has still seted up fixed orifices 12 on spraying dish 11, and fixed orifices 12 is in the periphery of recess 13, can be used to be fixed in spraying dish 1 on flange 6. The central position of the injection disk is provided with an injection hole 11, a plurality of injection holes 11 are uniformly distributed in a circumferential array in the circumferential direction around the injection hole, and each injection hole 11 is inclined and is also expanded outwards. Referring to fig. 1 and 2, in the present embodiment, two circumferential arrays of injection holes are formed on the injection plate around the injection hole 11 at the central position, and the injection plate is divided into a first circumferential array of injection holes and a second circumferential array of injection holes, the circumferential size of the first circumferential array of injection holes is smaller than the circumferential size of the second circumferential array of injection holes, the inclination degree of the first circumferential array of injection holes is smaller than the inclination degree of the second circumferential array of injection holes, the number of the first circumferential array of injection holes is 9, and the number of the second circumferential array of injection holes is 16.

In this application, directly set up the jet orifice on the injection dish, compare in other through setting up the scheme of the injection pipe that sprays all directions, the orientation design and its position design of jet orifice can direct the cooling oil directly high-efficiently to spray out, and avoided the inconvenient unstability of installation of injection pipe, cool off not good problem, can carry out high-efficient cooling to the piston head, and the installation is firm, long service life, also be convenient for change.

Example 2

A piston comprises a cooling oil injection disc of a marine low-speed diesel engine piston in embodiment 1, and referring to fig. 3 and 4, the injection disc 1 is mounted on a flange 6, the flange 6 is mounted on a piston rod 3, a cooling oil pipe 2 is mounted inside the flange 6, an oil outlet end of the cooling oil pipe 2 is aligned with a groove 13 on the injection disc 1, and the cooling oil pipe 2 is arranged concentrically with the groove with a circular cross section when being a circular pipe. The piston skirt 5 is arranged on the periphery of the piston rod 3, and the piston head 4 is arranged above the piston rod 3 and the piston skirt 5. The top center of the piston head 4 is provided with a first cylindrical cavity 41, a second vertical annular cavity 42 is arranged on the piston head in the peripheral circumferential direction of the first cavity 41, the first cavity 41 and the second cavity 42 are communicated through a first through hole 40, and the first through holes 40 are a plurality of and are all inclined. The ejection disc 1 is in the first cavity 41. A gap is formed between the inner wall of the piston rod 3 and the outer wall of the cooling oil pipe 2, the gap is an oil return channel, a second through hole 31 is formed in the piston rod 3, a vertical annular third cavity is formed in the piston skirt 5 and corresponds to and is communicated with a second cavity 42 in the piston head, and the second through hole 31 is communicated with the oil return channel and the third cavity.

The flow direction of the cooling oil in the cooling oil pipe 2 is guided by the emission of the injection hole 11 in the injection disc 1 as shown in fig. 4, and the cooling oil is injected into the first cavity 41, enters the second cavity 42 through the first through hole 40, and flows into the oil return channel through the third cavity and the second through hole 31. The entire piston head 4 is fully cooled. In addition, in the motion process of the piston, oil in each cavity can play a role in oscillation, and the cooling effect and efficiency are improved.

In conclusion, the injection disc 1 is mounted on the flange 6 at the tail end of the cooling oil pipe, the injection holes 11 are formed in the injection disc, the direction of the injection holes is divergently arranged, the positions of the injection holes are uniformly distributed, the cooling oil can be directly and efficiently guided to be injected to all directions in the first cavity, the piston head is efficiently cooled, and the injection disc 1 is convenient and firm to mount on the flange, long in service life and convenient to replace. The cooling effect of the piston adopting the injection disk is obviously improved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. The marine low-speed diesel engine piston cooling oil injection disc is characterized in that a groove (13) and an injection hole (11) are formed in the injection disc (1), and the injection hole (11) is communicated with the groove (13).

2. The marine low-speed diesel engine piston cooling oil injection disc of claim 1, characterized in that the central position of the injection disc is provided with injection holes (11), the injection holes (11) surrounding the central position are further provided with a plurality of injection holes on the injection disc.

3. The marine low-speed diesel engine piston cooling oil injection disc of claim 2, characterized in that the plurality of injection holes are arranged in an inclined shape expanding from one side where the grooves (13) are located to the other side.

4. The marine low speed diesel engine piston cooling oil jet disc of claim 3, wherein the plurality of jet holes are arranged in a circumferential array around the central jet hole and are distributed at least as a first circumferential array of jet holes and a second circumferential array of jet holes.

5. The marine low speed diesel engine piston cooling oil jet disc of claim 4, wherein the degree of inclination of said first circular array of jet holes is less than the degree of inclination of said second circular array of jet holes, said first circular array of jet holes being at an inner ring and said second circular array of jet holes being at an outer ring.

6. The marine low-speed diesel engine piston cooling oil injection disc as claimed in any one of claims 1-5, wherein the injection disc (1) is further provided with a fixing hole (12), and the fixing hole (12) is located at the periphery of the groove (13).

7. The marine low-speed diesel engine piston cooling oil injection disc as set forth in any one of claims 1-5, characterized in that the outer edge of the injection disc (1) is circular in shape, the cross section of the groove wall of the groove (13) is circular, and the groove (13) is disposed at the center of the injection disc (1).

8. A piston is characterized by comprising the marine low-speed diesel engine piston cooling oil injection disc as claimed in any one of claims 1 to 7, and further comprising a piston head (4), a piston skirt (5) and a piston rod (3), wherein the piston skirt (5) is mounted on the periphery of the piston rod (3), the piston head (4) is mounted above the piston skirt (5) and the piston rod (3), a cooling oil pipe (2) penetrates through the inside of the piston rod (3), a flange (6) is mounted at the tail end of the cooling oil pipe (2), the injection disc (1) is mounted on the flange (6), the groove (13) is located on one side close to the cooling oil pipe (2), a first cavity (41) is formed in the piston head (4), and the injection disc (1) is located in the first cavity (41).

9. The piston of claim 8, wherein the first cavity (41) is cylindrical, the piston head (4) is further provided with a second annular cavity (42), the first cavity (41) and the second cavity (42) are communicated through a first through hole (40), a gap is formed between the inner wall of the piston rod (3) and the outer wall of the cooling oil pipe (2), the piston rod (3) is provided with a second through hole (31), and the second through hole (31) is communicated with the gap and the second cavity (42).

10. A piston according to claim 9, characterized in that the top surface of the spray disk (1) is lower than the lower end of the first through hole (40).