JPH10205320A - Mist separator of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance separating efficiency as well as to improve the design by making a mist separator for separating blow-by gas from a valve arm chamber of an internal combustion engine into lubricating oil and air into the appearance having no irregularity. SOLUTION: A mist separator MS is arranged just under an insulator 7 for covering an exhaust duct 7 extending to a turbine T of a supercharger and the upper part of an intake duct 6 extending from a blower B and also in a clearance between the exhaust duct 5 and the intake duct 6. An inlet pipe 10 and an air outlet pipe 11 are deeply fitted in a mist separator container 8 and overlapped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mist separator for separating blow-by gas of an internal combustion engine into lubricating oil and gas.

[0002]

2. Description of the Related Art Conventionally, a structure is known in which a blow-by gas (a gas containing lubricating oil) is passed through a mist separator from a valve arm chamber or the like of an internal combustion engine through a breather to separate the lubricating oil component and the gas component. Yes, for example, 1-516
No. 48.

[0003]

The conventional mist separator is mainly cylindrical, and when it is mounted on an internal combustion engine, the shape and size of the mist separator are within the overall height (or overall width, overall length) of the engine. Was difficult to store. Further, as disclosed in the above-mentioned Japanese Patent Publication No. 1-51648, even if the size is within these engine dimensions, the design is inferior in terms of design because the unevenness is conspicuous in appearance.

The air pipe connected to the mist separator is intended only to function as an inlet pipe for introducing blow-by gas into the mist separator container and an air outlet pipe for discharging air after separation. However, it does not have a structure to fit deeply into the main body. However, in this case, there is a problem that blow-by gas introduced into the main body from the inlet pipe in the mist separator container is short-circuited to the air outlet pipe.

[0005]

The present invention uses the following means to solve the above two problems in the conventional mist separator of an internal combustion engine. First, as a means for solving the former problem, the lubricating oil content of the blow-by gas is set so as to be accommodated in the space between the insulator and the engine main body at a portion covered by the insulator for protecting the high-temperature portion of the internal combustion engine. A mist separator for separating gas and gas components is provided.

Next, as means for solving the latter problem,
In a mist separator that separates a lubricating oil component and a gas component of a blow-by gas of an internal combustion engine, an inlet pipe and an air outlet pipe are fitted into a mist separator container, and a fitting portion of each pipe in the mist separator container is inserted. Overlap.

[0007]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall front view of a marine diesel engine showing an arrangement position of an insulator 7 covering a mist separator MS according to the present invention, FIG. 2 is a side view thereof, and FIG.
4 is a plan view of the mist separator MS covered with the insulator 7, FIG. 5 is a side view of the mist separator MS, FIG. 6 is a front view of the mist separator MS, and FIG. FIG. 8 is a front sectional view of a mist separator MS having a configuration in which the mist separators overlap each other.

Referring to FIGS. 1 to 3, the location of the insulator of the marine diesel engine according to the present embodiment will be described. A cylinder head 2 is mounted on an engine body (cylinder block) 1, and a valve arm chamber cover 3 is mounted on the cylinder head 2.
Is installed. A lubricating oil cooler LC is provided on the front side of the engine body 1 and an intercooler IC is provided on the back side, and a seawater pipe 16 is connected to each cooler LC / IC. An oil pan 17 for collecting lubricating oil is provided at the bottom of the engine body 1.

A turbocharger turbine T and a blower B are disposed above one side of the engine body 1 (in this embodiment, above the flywheel housing FH). An exhaust manifold 4 extends from the cylinder head 2, and an exhaust duct 5 is connected to the turbine T from the exhaust manifold 4 to drive the turbine T. Further, the air supply duct 6 is connected to the intercooler IC provided on the rear side of the engine from the blower B.

[0010] The insulator is a cover for covering and protecting a high-temperature portion. An exhaust duct 5 extending from the exhaust manifold 4 to the turbine T and an air supply duct 6 extending from the blower B become hot due to the high temperature air therein, and the upper portion thereof is connected to the valve arm chamber cover 3. And is covered with an insulator 7. The insulator 7
Below, is surrounded by a part of the exhaust duct 5 and the turbine T, a part of the air supply duct 6 and a part of the blower B, and the engine body 1 (the upper end of the flywheel housing FH in this embodiment) therebelow. Gaps exist. In this part,
A mist separator MS for separating blow-by gas from the valve arm chamber is provided. Therefore, apparently, FIG.
As shown in FIG. 3 to FIG. 3, the mist separator MS is covered with the insulator 7 so that the mist separator MS cannot be seen, thereby improving the design and compactness.

Regarding the configuration of the mist separator MS,
This will be described with reference to FIGS. Mist separator MS
A glass wool (steel wool) 9 for adsorbing the lubricating oil in the blow-by gas is provided in a mist separator container 8, an inlet pipe 10 for sucking the blow-by gas, and discharging the separated air. Outlet pipe 11 for discharging the separated lubricant oil and a lubricant outlet pipe 12 for discharging the separated lubricant. In the inlet pipe 10,
As shown in FIG. 3, a breather pipe 13 is connected to a breather provided in the valve arm chamber, an air discharge pipe 14 connected to a supercharger silencer is extended from the air outlet pipe 11, and a lubricating oil outlet pipe 12 is connected to the breather pipe. A lubricating oil hose 15 for returning lubricating oil to the oil pan 17 extends. 4 to 6, hatched arrows indicate blow-by gas in which lubricating oil from the valve arm chamber and supply air leaked from each other, open arrows indicate air separated by the mist separator MS, and black arrows indicate air. Shows the lubricating oil after separation.

The connecting positions of the inlet pipe 10 and the air outlet pipe 11 to the mist separator container 8 are diagonal to each other in plan view as shown in FIG. Although a short circuit from the inlet pipe 10 to the air outlet pipe 11 in the separator container 8 is avoided as much as possible, it cannot be completely avoided, and air mixed with lubricating oil is discharged from the air outlet pipe 11. . For the purpose of avoiding this, in the embodiment shown in FIGS. 7 and 8, the inlet pipe 10 and the air outlet pipe 11 are fitted deeply inside the mist separator container 8, and further in the mist separator container 8. It overlaps. Therefore, the blow-by gas discharged from the inlet pipe 10 in the mist separator container 8 is bypassed and introduced into the air outlet pipe 11 as shown by the thin arrow, and by bypassing in this manner, it is sufficient. The air from which the lubricating oil has been substantially completely removed by the separation action is introduced into the air outlet pipe 11.

[0013]

According to the present invention, the mist separator for separating blow-by gas of an internal combustion engine into a lubricating oil component and an air component is configured as described above, and has the following effects. First, as described in claim 1, a space between the insulator and the engine body is effectively utilized as a mist separator storage portion at a portion covered by the insulator, and the mist separator is disposed in this space. In appearance, the mist separator is covered with the insulator and cannot be seen. Therefore, the design and compactness of the internal combustion engine are improved.

Further, according to the second aspect of the present invention, in the mist separator container, the blow-by gas discharged from the inlet pipe is diverted by the overlap to the inlet of the air outlet pipe. Thus, the air from which the lubricating oil has been sufficiently separated and removed can be discharged from the air outlet pipe. That is, the separating action of the mist separator is improved.

[Brief description of the drawings]

FIG. 1 is an overall front view of a marine diesel engine showing an arrangement position of an insulator 7 covering a mist separator MS according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a plan view of a mist separator MS covered by an insulator 7;

FIG. 5 is a side view of the same.

FIG. 6 is a front view of the same.

FIG. 7 is a plan sectional view of a mist separator MS having a configuration in which an inlet pipe 10 and an air outlet pipe 11 are overlapped in a mist separator container 8;

FIG. 8 is a front view of the same.

[Explanation of symbols]

 MS Mist separator 1 Engine body (cylinder block) 2 Cylinder head 3 Valve arm chamber cover 4 Exhaust manifold 5 Exhaust duct 6 Air supply duct 7 Insulator 8 Mist separator container 9 Glass wool (steel wool) 10 Inlet pipe 11 Air outlet pipe 12 Lubricating oil Outlet pipe

Claims (2)

[Claims] At a portion covered by an insulator for protecting a high-temperature portion of an internal combustion engine, a lubricating oil component and a gas component of blow-by gas are separated so as to be housed in a space between the insulator and the engine body. A mist separator for an internal combustion engine, wherein a mist separator is provided. 2. A mist separator for separating a lubricating oil component and a gas component of a blow-by gas of an internal combustion engine, wherein an inlet pipe and an air outlet pipe are fitted into a mist separator container, and each of the mist separator containers has A mist separator for an internal combustion engine, wherein a fitting portion of a pipe is overlapped.