JP3817007B2 - Mist separator for internal combustion engine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a mist separator that separates blow-by gas of an internal combustion engine into a lubricating oil component and a gas component.
[0002]
[Prior art]
Conventionally, a structure in which blow-by gas (gas mixed with lubricating oil) is passed from a valve arm chamber of an internal combustion engine through a mist separator through a mist separator and separated into a lubricating oil component and a gas component has been known. No. 1-51648.
[0003]
[Problems to be solved by the invention]
Conventional mist separators are mainly cylindrical, and when they are attached to an internal combustion engine, it is difficult to accommodate them within the full height (or full width, full length) of the engine in terms of shape and size. It was.
In addition, as disclosed in the above Japanese Patent Publication No. 1-51648, even if it is within these engine dimensions, the uneven portion is conspicuous in appearance, so that the design is inferior.
[0004]
The air pipe connected to the mist separator is only intended to serve as an inlet pipe for introducing blowby gas to the mist separator container and an air outlet pipe for discharging the separated air. It is not designed to be deeply inserted. However, in this case, there is a problem that the 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]
[Means for Solving the Problems]
The present invention uses the following means in order to solve the above two problems in the mist separator of the conventional internal combustion engine.
In claim 1, a cylinder head 2 is mounted on an upper portion of the cylinder block 1, a valve arm chamber cover 3 is mounted on the cylinder head 2, and a lubricating oil cooler LC and an intercooler IC are provided before and after the cylinder block 1. Further, a turbocharger turbine T and a blower B are disposed above one side of the cylinder block 1, and an exhaust manifold 4 is extended from the cylinder head 2. An exhaust duct 5 is connected to T, an air supply duct 6 is connected to the intercooler IC from the blower B, and the exhaust duct 5 and the air supply duct 6 are covered with an insulator 7 which is a cover for protecting a high temperature region. In the lower part of the insulator 7, the gap between the turbine T, the blower B, and the cylinder block 1 is inserted into the gap from the valve arm chamber. The mist separator MS to separate and the gas partial lubricating oil of Robaigasu in which is disposed.
[0006]
According to claim 2, in the mist separator of the internal combustion engine according to claim 1, the inlet pipe 10 and the air outlet pipe 11 of the mist separator MS are fitted into the mist separator container 8, and the mist separator container 8 The fitting portion of each tube is overlapped .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of an entire 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, FIG. 3 is a plan view, and FIG. 4 is a mist covered by the insulator 7. FIG. 5 is a side view of the separator MS, FIG. 6 is a front view of the separator MS, and FIG. 7 is a plan sectional view of the mist separator MS in which the inlet pipe 10 and the air outlet pipe 11 are overlapped in the mist separator container 8. 8 and 8 are front views.
[0008]
The arrangement position of the insulator of the marine diesel engine in this embodiment will be described with reference to FIGS.
A cylinder head 2 is mounted on the upper part of the engine body (cylinder block) 1, and a valve arm chamber cover 3 is mounted thereon. A lubricating oil cooler LC is disposed on the front side of the engine body 1 and an intercooler IC is disposed on the rear side. A seawater pipe 16 is piped to each cooler LC / IC. An oil pan 17 that collects lubricating oil is disposed at the bottom of the engine body 1.
[0009]
A turbocharger turbine T and a blower B are disposed above one side of the engine body 1 (above the flywheel housing FH in this embodiment). 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, an air supply duct 6 is connected to an intercooler IC disposed on the rear side of the engine from the blower B.
[0010]
The insulator 7 is a cover for covering and protecting the high temperature part. The exhaust duct 5 from the exhaust manifold 4 to the turbine T and the air supply duct 6 extending from the blower B become hot due to the internal high temperature air, and the upper part thereof is connected to the valve arm chamber cover 3. Then, it is covered with an insulator 7. Below the insulator 7, 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 main body 1 (the upper end of the flywheel housing FH in this embodiment). ). A mist separator MS for separating blowby gas from the valve arm chamber is disposed at this portion. Accordingly, in appearance, as shown in FIGS. 1 to 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.
[0011]
The structure of the mist separator MS will be described with reference to FIGS.
The mist separator MS includes a glass wool (steel wool) 9 for adsorbing the lubricating oil in the blow-by gas in the mist separator container 8, an inlet pipe 10 for sucking the blow-by gas, and the separated air. An air outlet pipe 11 for discharging the lubricating oil and a lubricating oil outlet pipe 12 for discharging the separated lubricating oil extend outward. As shown in FIG. 3, a breather pipe 13 is connected to the inlet pipe 10 from a breather provided in the valve arm chamber, and an air discharge pipe 14 connected to a supercharger silencer is extended from the air outlet pipe 11. A lubricating oil hose 15 for returning the lubricating oil to the oil pan 17 is extended from the lubricating oil outlet pipe 12. 4 to 6, hatched arrows indicate blow-by gas in which lubricating oil and air supply leakage air from the valve arm chamber are mixed, white arrows indicate air after separation by the mist separator MS, and black arrows indicate The same shows the lubricant after separation.
[0012]
Note that the connection positions of the inlet pipe 10 and the air outlet pipe 11 to the mist separator container 8 are diagonal to each other as shown in FIG. 4 in plan view in the embodiment of FIGS. Although a short circuit from the inlet pipe 10 to the air outlet pipe 11 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.
In order to avoid this, in the embodiment shown in FIGS. 7 and 8, the inlet pipe 10 and the air outlet pipe 11 are inserted deeply into 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 detoured and introduced into the air outlet pipe 11 as indicated by a thin line arrow. The air in a state where the lubricating oil is removed almost completely after being separated is introduced into the air outlet pipe 11.
[0013]
【The invention's effect】
Since the present invention is configured as described above in the mist separator that separates the blow-by gas of the internal combustion engine into the lubricating oil component and the air component, the following effects can be obtained.
As in claim 1 , a cylinder head 2 is mounted on the top of the cylinder block 1, a valve arm chamber cover 3 is mounted on the cylinder head 2, and a lubricating oil cooler LC and an intercooler IC are installed before and after the cylinder block 1. Further, a turbocharger turbine T and a blower B are disposed above one side of the cylinder block 1, and an exhaust manifold 4 is extended from the cylinder head 2. An exhaust duct 5 is connected to T, an air supply duct 6 is connected to the intercooler IC from the blower B, and the exhaust duct 5 and the air supply duct 6 are covered with an insulator 7 which is a cover for protecting a high temperature region. In the lower part of the insulator 7, in the gap surrounded by the turbine T, the blower B and the cylinder block 1, Having arranged the mist separator MS to separate and the gas partial lubricating oil of Baigasu at sites covered by the insulator 7, the space between the insulator and the engine body, effectively as a storage site for the mist separator By utilizing this, it becomes possible to dispose a mist separator in this space, and the mist separator is not visible because it is covered with an insulator.
Therefore, the design and compactness of the internal combustion engine are improved.
[0014]
Since the inlet pipe 10 and the air outlet pipe 11 of the mist separator MS are fitted into the mist separator container 8 and the fitting portions of the respective pipes in the mist separator container 8 are overlapped . In the mist separator container 8, the blow-by gas discharged from the inlet pipe is detoured to the inlet portion of the air outlet pipe by an overlap amount, and undergoes a sufficient separation action in this detouring process. Thus, air from which the lubricating oil has been sufficiently removed can be discharged. That is, the separating action of the mist separator is improved.
[Brief description of the drawings]
FIG. 1 is a front view of a marine diesel engine as a whole, showing an arrangement position of an insulator 7 that covers a mist separator MS according to the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is also a plan view.
4 is a plan view of a mist separator MS covered with an insulator 7. FIG.
FIG. 5 is a side view of the same.
FIG. 6 is a front view of the same.
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.
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 12

Claims (2)

A cylinder head 2 is mounted on the top of the cylinder block 1, a valve arm chamber cover 3 is mounted on the cylinder head 2, a lubricant cooler LC and an intercooler IC are disposed before and after the cylinder block 1, and A turbocharger turbine T and a blower B are disposed above one side of the cylinder block 1, an exhaust manifold 4 is extended from the cylinder head 2, and an exhaust duct 5 is connected to the turbine T from the exhaust manifold 4. In the configuration in which the air supply duct 6 is connected to the intercooler IC from the blower B, and the exhaust duct 5 and the air supply duct 6 are covered with an insulator 7 which is a cover for protecting a high temperature region.
A mist separator MS for separating the lubricating oil component and the gas component of the blow-by gas from the valve arm chamber is disposed below the insulator 7 in a gap surrounded by the turbine T, the blower B, and the cylinder block 1. A mist separator for internal combustion engines. The mist separator for an internal combustion engine according to claim 1,
An internal combustion engine characterized in that an inlet pipe 10 and an air outlet pipe 11 of a mist separator MS are fitted into a mist separator container 8 and the fitting portions of the respective pipes in the mist separator container 8 are overlapped . Mist separator.

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