CN2321946Y

CN2321946Y - Mushroom shape swirl chamber structure for diesel engine combustion chamber

Info

Publication number: CN2321946Y
Application number: CN 97207931
Authority: CN
Inventors: 黄乃荣
Original assignee: CHENZHOU DIESEL ENGINE FACTORY HUNAN PROV
Current assignee: CHENZHOU DIESEL ENGINE FACTORY HUNAN PROV
Priority date: 1997-01-29
Filing date: 1997-01-29
Publication date: 1999-06-02
Anticipated expiration: 2007-01-29

Abstract

The utility model discloses a swirl chamber structure of a diesel engine combustion chamber, which is composed of a swirl chamber communicated with an oil spray hole (7) on a cylinder cover body (1), and a lower insert block (2), wherein the insert block (2) is provided with an air guiding groove (5) and a start-up oil spray hole (6), the swirl chamber is composed of an upper cavity (3) and a lower cavity (4), and the cavity (4) is communicated with the air guiding groove (5) and the start-up oil spray hole (6). The utility model can reduce the heat loss of the precombustion gas effectively, so that the low temperature cold starting performance of a diesel engine is improved obviously. The utility model is suitable for various types of diesel engines.

Description

The mushroom-like vortex chamber structure of burning chamber of diesel engine

The utility model relates to the chamber structure of diesel engine, further is meant vortex chamber's structure of firing chamber.

In the prior art, vortex chamber's structure shape of burning chamber of diesel engine is unreasonable, thereby thermal loss is big, causes the cold starting performance (being the cold starting performance) of diesel engine poor.

The purpose of this utility model is, designs a kind of mushroom-like vortex chamber structure of burning chamber of diesel engine, has the little characteristics of pre-burning gas thermal loss, to improve the cold-start performance of diesel engine.

The technical solution of the utility model is, it is inserted by vortex chamber that is communicated with nozzle opening on the cylinder lid and bottom and forms, insert and be provided with gas flow guiding groove and starting nozzle opening, its structural feature is, described vortex chamber is made of the bottom cavity volume of top cavity volume and connection with it, and described bottom cavity volume is communicated with gas flow guiding groove and starting nozzle opening.

Make below in conjunction with accompanying drawing and to further specify.

Description of drawings: Fig. 1 is practical structures (sectional view), and Fig. 2 to Fig. 4 is other three kinds of example structure (sectional view).In the drawings:

1-cylinder lid, 4-bottom cavity volume,

2-inserts, 5-gas flow guiding groove,

3-top cavity volume, 6-starts nozzle opening, 7-nozzle opening.

By accompanying drawing as can be known, the utility model is by the upper minor air cell that is communicated with nozzle opening (7) of cylinder cover (1) and lower Section insert (2) form, insert (2) are provided with gas flow guiding groove (5) and start nozzle opening (6), its design feature is, The minor air cell by top cavity volume (3) and the bottom cavity volume (4) that is communicated with it with gas flow guiding groove (5) with start oil spout Hole (6) is communicated with. Described top cavity volume (3) can be spherical (comprising approximate spherical) or the spherical rounding that adds Platform shape (comprising approximate reverse frustoconic) or spherically add cylindrical (comprising near cylindrical) and add the reverse frustoconic cavity volume; Bottom cavity volume (4) is cylindrical (comprising near cylindrical) cavity volume, and its cylindrical radius of circle holds less than top The spherical radius of a ball in chamber. Gas flow guiding groove (5) and starting nozzle opening (6) are the prior art structure. Described lower Section's cavity volume can be arranged on (2) upper (referring to Fig. 1 and the Fig. 2) that insert, and this moment, its upper and lower port can be that Fig. 1 is described Straight mouthful also can be shown in Figure 2 with circular arc; Bottom cavity volume (4) is gone back but part shown in Figure 3 is established cylinder Lid (1) upward and partly is located at (2) the upper structure of inserting, and also can as shown in Figure 4 this bottom cavity volume (4) be located at In the cylinder cover (1).

Design principle of the present utility model is, because described structure, pre-burning gas is on top during diesel engine starting Form eddy current center among a small circle in the cavity volume (3) (being the mushroom-shaped head cavity volume), the gas flow model at its center Enclose little, thereby can be very big in the low speed situation limit ground reduce the heat loss of pre-burning gas, thereby improve cold Moving performance; Behind the diesel engine starting at a high speed during normal operation because minor air cell's gas flow rate is accelerated whirlpool among a small circle Stream center flow velocity is faster, can make again the high velocity air acquisition at fuel oil that fuel injector sprays into and little eddy current center this moment Good mixing, thereby can improve burning quality, for cold startability, the while of improving diesel engine do not change again Other main performance index of diesel engine condition that provides the foundation. This structure of test sufficient proof has significantly improved Diesel engine cold starting performance keeps other main performance not change simultaneously.

As known from the above, the utility model is the mushroom shape swirl chamber structure of burning chamber of diesel engine, has pre-burning Air heat loses little characteristics, has improved the cold-start performance of diesel engine.

Embodiment: according to the utility model of Fig. 1 and said structure, 9.5 millimeters of the spherical radiuses of a ball of cavity volume (3), cylinder is high 2.3 millimeters, the rounding platform is high 1.5 millimeters; The cylindrical circle radius of cavity volume (4) and highly be respectively 8 millimeters and 11 millimeters, gas flow guiding groove (5) is prior art common structure and size with starting nozzle opening (6).

Claims

1, a kind of mushroom-like vortex chamber structure of burning chamber of diesel engine, by cylinder lid (1) go up vortex chamber and the bottom be communicated with nozzle opening (7) insert (2) form, there is gas flow guiding groove (5) (2) bottom of inserting and starts nozzle opening (6), it is characterized in that, described vortex chamber is made of the bottom cavity volume (4) of top cavity volume (3) and connection with it, and bottom cavity volume (4) is communicated with gas flow guiding groove (5) and starting nozzle opening (6).

2, the mushroom-like vortex chamber structure of burning chamber of diesel engine according to claim 1 is characterized in that, top cavity volume (3) adds reverse frustoconic or spherically adds the cylindrical rounding that adds and fall from power and describe the chamber for spherical or spherical; Bottom cavity volume (4) is cylindrical cavity volume, and its cylindrical circle radius is less than the spherical radius of a ball of top cavity volume.

3, the mushroom-like vortex chamber structure of burning chamber of diesel engine according to claim 1, it is characterized in that, described bottom cavity volume (4) is located in the cylinder lid (1) or is located on insert (2), or part is located on the described cylinder lid (1) and part is located on insert (2).

4, the mushroom-like vortex chamber structure of burning chamber of diesel engine according to claim 1 is characterized in that, described spherical, reverse frustoconic, the cylindrical approximate shapes that comprises them.