KR20140047153A - Contamination-preventing structure for scavenging-air water droplet separator, and vessel provided with contamination-preventing structure for scavenging-air water droplet separator - Google Patents

Abstract

The simple and inexpensive construction prevents the drain oil flowing back from the scavenging port side of the engine to adhere to the water droplet separator. The water droplet separator contamination prevention structure 47 of the scavenging air is arranged in the air conduit 22 connecting between the supercharger and the scavenging port of the engine, in order from the supercharger side, to the air cooler, the water droplet separator 24 and the scavenging trunk chamber 25. ) Is formed, and when the scavenging trunk chamber 25 extends upward of the water droplet separator 24 and is connected to the scavenging port, it is dropped in the scavenging trunk chamber 25 from the scavenging port side after the engine stops. In order to prevent the drain oil from falling into the water separator 24, an upper fixing member 57 for fixing the top of the water separator 24 into the air conduit 22 is formed in a cover covering the top surface of the water separator 24; Together, the end portion of the upper fixing member 57 at the side of the scavenging trunk chamber 25 side was extended in the sunshade shape to form the front extension part 62.

Description

FIELD OF CONTAMINATION-PREVENTING STRUCTURE FOR SCAVENGING-AIR WATER DROPLET SEPARATOR, AND VESSEL PROVIDED WITH CONTAMINATION-PREVENTING STRUCTURE FOR SCAVENGING-AIR WATER DROPLET SEPARATOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water droplet separator contamination prevention structure of sweeping air attached to a large diesel engine having a supercharger, and a ship provided with the same.

In marine large diesel engines, many turbochargers such as turbochargers are provided to increase engine efficiency. Since the air supplied to the engine generates heat by the heat of compression when compressed to the supercharger, an air cooler is formed to cool this heat. Compressed and hot air produces a large amount of drain water when cooled in an air cooler. If compressed air containing this drain water (hereinafter referred to as "scavenged air") is supplied to the engine as it is, there is a fear that moisture may corrode the sliding surface of the cylinder liner, etc. As can be seen, a water droplet separator (drain separator) is provided downstream of the air cooler, and the drain water contained in the sweep air is separated by the condensation action, so that only the sweep air from which moisture has been removed is supplied to the engine. Viii). The drain water separated by the droplet separator is discharged outboard (sea, etc.) via the drain water discharge pipe.

In a diesel engine of a marine engine, as disclosed in Patent Literature 1, the scavenging air from which the drain water is removed from the water droplet separator includes an air conduit, a scavenging trench primary chamber, and a scavenging trunk secondary chamber extending upward from the water droplet separator. This is the layout supplied to the scavenging port of the engine. On the other hand, a part of the oil supplied to lubricate the cylinder liner and the piston of the engine is drained from the scavenging port side to drain oil in the scavenging trunk secondary compartment and the scavenging trunk primary compartment after the engine stops. For this reason, the drain oil discharge pipe for discharging this drain oil is arrange | positioned in the bottom part of the scavenging trunk primary compartment which is the lowest position. Since the droplet separator faces the scavenging trunk primary compartment, a botbank-shaped shielding plate is placed between the bottom of the scavenging trunk primary compartment and the droplet separator so that the drain oil that has flowed to the bottom of the scavenging trunk primary compartment does not flow to the droplet separator side. A stepped portion is formed in which the water droplet separator side becomes higher.

Japanese Patent No. 4233878 Japanese Patent Application Laid-Open No. 11-350964

Conventionally, when drain oil drips off from the scavenging port side after engine stop as mentioned above, this drain oil often adhered to the water droplet separator beyond the said shielding plate or step part. In this way, the drain oil attached to the water droplet separator flows into the drain water discharge pipe together with the drain water attached to the water droplet separator, and is discharged to the outside as it is, which may cause environmental pollution. As for this problem, no improvement has been made until now.

SUMMARY OF THE INVENTION An object of the present invention is to provide a water droplet separator contamination prevention structure of sweeping air which can prevent the drain oil flowing back from the scavenging port side of the engine, by a simple and inexpensive construction, to be attached to the water droplet separator, and a vessel provided with the same. It is done.

According to a first aspect of the water droplet separator contaminant preventing structure of the cleaned air according to the present invention, an air cooler, a water droplet separator, and a scavenging trunk chamber are sequentially formed from the supercharger side in an air conduit connecting between the supercharger and the scavenging port of the engine. A water droplet separator contamination prevention structure of cleaning air in the case where the scavenging trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side, the drain falling down from the scavenging port side after the engine stop. The scavenging trunk of the upper fixing member, while forming an upper fixing member for fixing the upper portion of the water droplet separator in the air conduit so as to prevent oil from falling into the water droplet separator, and covering the upper surface of the water droplet separator. Extend the front end by extending the actual end in shade shape It is characterized by forming a part.

According to the above configuration, the upper fixing member for fixing the upper portion of the droplet separator in the air conduit also functions as a cover covering the upper surface of the droplet separator, so that the upper fixing member is drained from the scavenging port side after the engine stops. Shield against the water separator. This prevents the drain oil from adhering to the droplet separator.

Moreover, the drain oil which dripped on the upper fixing member is dripped from the front end of the front extension part formed by extending the edge part at the side of the desired trunk chamber side of the upper fixing member to a sunshade shape. At this time, this dripping drain oil passes through the position separated by the amount of extension of the front side extension with respect to the surface of the scavenging trunk chamber side of the water droplet separator, and falls to the bottom of the scavenging trunk chamber. For this reason, adhesion of the drain oil to a water droplet separator can be prevented more effectively.

In this way, since the drain oil dripping off the scavenging port side after the engine stops does not adhere to the water droplet separator, the drain oil is mixed with the drain water separated from the suction sweep air by the water droplet separator and flows into the drain water discharge pipe as it is. The idea of polluting the environment can be effectively prevented.

In addition, this water droplet contaminant preventing structure can be configured simply by changing the shape of the upper fixing member for fixing the upper part of the water droplet separator in the air conduit, so that it can be made simple and inexpensive.

According to a second aspect of the droplet separator contamination prevention structure of the sweeping air according to the present invention, in the first aspect, the drain oil is located at the bottom of the scavenging trunk compartment and also in a position close to the droplet separator. A blotting portion for preventing the flow is formed, and the front extension portion is pushed to the opposite side of the water droplet separator beyond just above the bloating portion.

According to the above configuration, when the drain oil dripping on the upper fixing member is dropped from the tip of the front extension part, it does not fall to the water droplet separator, but reliably falls to the bottom of the scavenged trunk compartment, which becomes the region on the opposite side of the water droplet separator than the freezing portion. The waste oil is discharged to the drain oil discharge pipe formed at the bottom of the scavenging trunk chamber. For this reason, it is possible to prevent the drain oil from adhering to the water droplet separator or flowing into the drain water discharge pipe into which the drain water separated by the water droplet separator flows.

According to a third aspect of the water droplet separator contaminant preventing structure of the cleaned air according to the present invention, an air cooler, a water droplet separator, and a scavenging trunk chamber are sequentially formed from the supercharger side in an air conduit connecting between the supercharger and the scavenging port of the engine. A water droplet separator contamination prevention structure of cleaning air in the case where the scavenging trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side, the drain falling down from the scavenging port side after the engine stop. The scavenging trunk of the upper fixing member, while forming an upper fixing member for fixing the upper portion of the water droplet separator in the air conduit so as to prevent oil from falling into the water droplet separator, and covering the upper surface of the water droplet separator. Along the side edge adjacent to the end of the actual measurement, It characterized in that the fence portion is formed in the vertical wall.

According to the above configuration, as in the case of the first aspect, the upper fixing member functions as a cover covering the upper surface of the water droplet separator, so as to shield the water droplet separator from the drain oil that drops off from the scavenging port side when the engine is stopped. To prevent contamination of the water separator.

In addition, the drain oil dropped on the upper fixing member is blocked by the fence portion on the vertical wall formed in the upper fixing member and does not flow downward from the side of the upper fixing member. It flows downwards from. For this reason, in particular, it is possible to effectively prevent the drain oil from adhering to the side of the water droplet separator.

A fourth aspect of the water droplet separator contamination prevention structure of the cleaned air according to the present invention is the third aspect, wherein the fence portion is formed by fixing an angle member having an L-shaped cross section to an upper surface of the upper fixing member along the side edge. It is characterized by one.

According to the said structure, a fence part can be formed simply and inexpensively. In addition, since the angle member can be shared as a fixture of the upper fixing member, deformation, vibration, and the like of the upper fixing member can be effectively suppressed.

According to a fifth aspect of the water droplet separator contaminant preventing structure of the cleaned air according to the present invention, an air cooler, a water droplet separator, and a scavenging trunk chamber are sequentially formed in the air conduit connecting between the supercharger and the scavenging port of the engine. A water droplet separator contamination prevention structure of cleaning air in the case where the scavenging trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side, the drain falling down from the scavenging port side after the engine stop. The scavenging trunk of the upper fixing member, while forming an upper fixing member for fixing the upper portion of the water droplet separator in the air conduit so as to prevent oil from falling into the water droplet separator, and covering the upper surface of the water droplet separator. Separation of the position of the side edge adjacent to the end of the measurement To more of a side extending in the shape shade to the outside is characterized in that the formation of an extension transverse.

According to the above configuration, as in the case of the first and second aspects, the upper fixing member functions as a cover covering the upper surface of the water droplet separator, so that the drain oil dripping off from the scavenging port side is shielded against the water droplet separator. To prevent contamination of the water separator.

In addition, since the sunshade-shaped lateral extension formed on the side of the upper fixing member extends outwardly to the sunshade shape than the side of the water droplet separator, the drain oil dropped on the upper fixing member is blocked by the lateral extension and the There is no fall off the side. For this reason, in particular, it is possible to effectively prevent the drain oil from adhering to the side of the water droplet separator.

A sixth aspect of the water droplet separator contamination prevention structure of the sweeping air according to the present invention is vertical in the first aspect, the vertical wall being standing up along a side edge adjacent to an end of the scavenging trunk room side of the upper fixing member. It characterized in that the fence portion of the.

According to the above configuration, the upper fixing member functions as a cover covering the upper surface of the water droplet separator, to shield the oil separator from the drain oil falling off from the scavenging port side, thereby preventing contamination of the water droplet separator. In addition, since the drain oil dropped on the upper fixing member is dropped from the tip of the front extension of the upper fixing member, it passes through the position separated to the scavenging trunk chamber side by the extension amount of the front extension member and falls to the bottom of the scavenging trunk chamber. In addition, it is possible to effectively prevent the drain oil from adhering to the water droplet separator.

Further, the drain oil dropped on the upper fixing member is blocked by the fence portion on the vertical wall formed in the upper fixing member and does not flow downward from the side of the upper fixing member, but flows downward from the front end of the front extension part. For this reason, in particular, it is possible to effectively prevent the drain oil from adhering to the side of the water droplet separator.

According to a seventh aspect of the water droplet separator contamination prevention structure of the sweeping air according to the present invention, in the first or third aspect, the water droplet separator is configured to be positioned at a side of the upper fixing member adjacent to an end of the scavenging trunk room side. It is characterized in that the lateral extension is formed by extending outward from the side of the sunshade.

According to the said structure, in addition to the effect in the said 1st or 3rd aspect, the lateral extension part of the sunshade shape formed in the side part of the upper fixing member extended to the sunshade shape outward rather than the side surface of the water droplet separator, The drain oil dripping onto the fixing member is blocked by the lateral extension and does not flow down the side of the water droplet separator, effectively preventing the drain oil from adhering to the side of the water droplet separator.

The ship which concerns on this invention was equipped with the water droplet separator of any one of said 1st-7th characterized by the above-mentioned.

According to this vessel, the simple and inexpensive configuration prevents the drain oil flowing back from the scavenging port side in the air conduit connecting the scavenging port of the engine and the supercharger to be attached to the drooping separator, and is sucked by the drooping separator. Drain oil is mixed in the drain water separated from the air and can be prevented from being discharged to the outside as it is.

As mentioned above, according to the water droplet separator contamination prevention structure of the sweeping air which concerns on this invention, and the ship provided with this, a simple and inexpensive structure prevents the drain oil which flows back from the scavenging port side of an engine to a droplet separator. can do.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the structural example of the ship's large diesel engine, a supercharger, an air conduit, etc. provided with the water droplet separator contamination prevention structure which concerns on one Embodiment of this invention.
FIG. 2 is an enlarged longitudinal sectional view of an air conduit, a scavenging trunk compartment, a water droplet separator, and the like shown in FIG. 1.
FIG. 3 is a front view of the droplet separator and the like viewed from the direction of arrow III in FIG. 2.
4 is a view showing a first embodiment of the water droplet separator contamination prevention structure by a longitudinal section along the line IV-IV of FIG.
5 is an enlarged view of portion V of FIG. 3.
6 is a perspective view of an angle member constituting the fence portion.
7 is a longitudinal sectional view showing a second embodiment of the droplet separator contamination prevention structure.

EMBODIMENT OF THE INVENTION Below, two embodiment of this invention is described, referring FIGS. 1-7.

[First Embodiment]

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a structural example of a marine diesel engine, a supercharger, an air conduit, and the like provided with a water droplet separator contamination prevention structure according to an embodiment of the present invention.

This diesel engine 1 is a 2-cycle multicylinder engine of the well-known uniflow system, for example, The cylinder liner 4 is formed in the cylinder jacket 3 provided on the crankcase 2, This cylinder The cylinder head 5 is formed in the upper end of the liner 4. The cylinder bore 6 is formed inside the cylinder liner 4, and the piston 7 is inserted in the cylinder bore 6 so that the piston 7 can slide freely. It is well known that the piston rod 8 is connected to the piston 7, and the lower end of the piston rod 8 is connected to the crankshaft through a cone rod not shown.

In the lower part of the cylinder liner 4, the some scavenging port 11 is formed side by side in the circumferential direction. Moreover, the scavenging passage 12 is enclosed around the scavenging port 11 and inside the cylinder jacket 3. On the other hand, the exhaust port 13 and the exhaust valve 14 which open and close this are formed in the front part of the cylinder head 5. The exhaust valve 14 is opened and closed by a camshaft or an electronically controlled hydraulic system, not shown, and is modified in synchronization with the timing at which the piston 7 ascends the inside of the cylinder bore 6.

The exhaust ports 13 of the plurality of cylinders of this diesel engine 1 are connected to the cylindrical exhaust constant pressure chamber 17 (surge tank) along the cylinder arrangement direction via the exhaust pipe 16, respectively, and this exhaust The exhaust turbine side flow path 19 of the turbocharger 18 (supercharger) is connected to the constant pressure chamber 17. Moreover, the intake turbine side flow path 20 of the turbocharger 18 is connected to the scavenging passage 12 via the air conduit 22 provided with the substantially U-shaped longitudinal cross-sectional shape. Inside the air conduit 22, the air cooler 23 and the water droplet separator 24 are provided in order from the turbocharger 18 side, and the downstream side of the water droplet separator 24, and also the air conduit 22 A scavenging trunk chamber 25 extending in the vertical direction is disposed at the portion connected to the passage 12. The air cooler 23 and the water droplet separator 24 are provided with a multi-layer air passage, not shown, and are cooled from the inside by a coolant such as cooling water.

The water droplet separator 24 is provided at the bottom of the scavenging trunk chamber 25, the scavenging trunk chamber 25 extends upward from the water droplet separator 24 and is connected to the scavenging port 11, The scavenging trunk primary compartment 25A located in the upstream side, and the scavenging trunk secondary compartment 25B located in the upper side (downstream side). The scavenging valve 28 on a plurality of reed valves is formed in the partition plate 27 obliquely interposed between the scavenging trunk primary compartment 25A and the scavenging trunk secondary compartment 25B. The scavenging valve 28 is a check valve for passing only the airflow flowing from the scavenging trunk primary compartment 25A to the scavenging trunk secondary compartment 25B and blocking the airflow in the reverse direction. Moreover, the auxiliary blower 29 which communicates between 25 A of scavenging trunk primary compartments and 25 B of scavenging trunk secondary compartments with a small opening area is formed.

When the diesel engine 1 operates, exhaust gas of high temperature and high pressure flows from the exhaust port 13 to the exhaust turbine side flow path 19 of the turbocharger 18 via the exhaust pipe 16 and the exhaust constant pressure chamber 17. The turbine of the turbocharger 18 is rotated at high speed. Thus, after the outside air enters the turbocharger 18 and is compressed, it enters the air conduit 22 as clean air through the intake turbine side flow path 20. Since this sweep air is exothermic by heat of compression, it cools down when it passes through the air cooler 23. At that time, since a large amount of drain water is generated, water is removed by condensation in the water droplet separator 24 formed on the downstream side of the air cooler 23, and the dried air becomes scavenging trunk primary compartment 25A and scavenging trunk. It passes through the secondary compartment 25B and is supercharged in the cylinder bore 6 from the plurality of scavenging ports 11 via the scavenging passage 12.

As enlarged in FIG. 2, the water droplet separator 24 is substantially rectangular parallelepiped shape, and is provided in 25 A of scavenging trunk primary chambers. At the bottom of the scavenging trunk primary chamber 25A, a drain water discharge hole 32 and a drain water discharge pipe 33 are disposed at a position immediately below the water droplet separator 24, and the water droplet separator 24 The separated drain water is discharged out of the ship (sea, etc.) via the drain water discharge hole 32 and the drain water discharge pipe 33. Moreover, at the bottom part of 25 A of scavenging trunk | chamber primary chambers, and the position close | similar to the water droplet separator 24, the bot duct shaped shield board 36 (blind part) which stands up upward is formed. And the drain oil discharge hole 38 and the drain oil discharge pipe 39 are arrange | positioned in the bottom part of the scavenging trunk primary chamber 25A which becomes the opposite side of the water droplet separator 24 with this shielding plate 36 interposed, have. The shield plate 36 is also a supporting member of the droplet separator 24, as will be described later.

When the diesel engine 1 is stopped, the oil supplied to lubricate the sliding portion between the cylinder liner 4 and the piston 7 flows back from the scavenging port 11 and the scavenging passage 12, so that the partition plate ( It drops in the scavenging trunk chambers 25 (25A, 25B) as drain oil via the clearance of the scavenging valve 28 formed in 27, and flows into the bottom part of the scavenging trunk primary chamber 25A. The drain oil which flowed in this way is prevented from moving to the water droplet separator 24 side by the shielding plate 36, and is stored in the waste oil tank (not shown) via the drain oil discharge hole 38 and the drain oil discharge pipe 39. do. As shown in FIG. 2 and FIG. 3, the inside of the scavenging trunk primary compartment 25A is divided by a plurality of intake buffer plates 41 provided in parallel along the engine longitudinal direction, and approximately the central portion of these intake buffer plates 41. The intake distribution hole 42 is formed in the perforated portion, and a notch-shaped drain oil distribution portion 43 for smoothly flowing the drain oil into the drain oil discharge pipe 39 is formed in the lower portion of the intake buffer plate 41. .

Next, the droplet separator contamination prevention structure 47 is demonstrated.

The vertical wall part 49 (refer FIG. 2, FIG. 4) between the scavenging trunk | chamber primary compartment 25A and the room in which the air cooler 23 is formed, for passing the cleansing air conveyed from the turbocharger 18 is made to pass. The opening part 50 is formed, and the water droplet separator 24 is attached to the vertical wall part 49 so that the opening part 50 may be blocked. Here, in order to facilitate explanation, the surface which opposes the vertical wall part 49 among each surface which comprises the water droplet separator 24 is called "rear surface 24R", and faces the scavenged trunk primary compartment 25A. The surface is called "front surface 24F", the surface parallel to the intake buffer plate 41 is called "side surface 24S", and 24U is attached | subjected to an upper surface. As shown in FIGS. 2-5, the water droplet separator 24 is being fixed to the vertical wall part 49 by the mounting bracket 53 and the bolt 54 whose side surface 24S used the angle material etc., The lower part of the front surface 24F overlaps with the shielding plate 36, and is fixed by the bolt 55. As shown in FIG. Moreover, the upper part of the water droplet separator 24 is being fixed to the vertical wall part 49 via the upper fixing member 57. As shown in FIG.

The upper fixing member 57 is a drop separator 24 so that the drain oil dripping into the scavenging trunk chamber 25 (25A, 25B) from the scavenging port 11 side after the engine stops does not fall on the drop separator 24. It is formed in the shape of a cover which covers 24U of upper surfaces. As shown in FIG. 4, the upper fixing member 57 includes a fixing unit upper surface 57U parallel to the upper surface 24U of the water droplet separator 24 and a rear edge of the fixing unit upper surface 57U. The rear fixing surface 57R, which is fastened to the vertical wall portion 49 by the bolt 58, sags downward from the front edge of the upper surface 57U of the fixing portion, and is spaced by the bolt 60 with the space collar 59 therebetween. The front fixing surface 57F which is fastened to the front surface 24F of the water droplet separator 24 is provided.

An end portion on the scavenging trunk primary compartment 25A side of the upper fixing member 57 extends in a sunshade shape with respect to the front surface 24F of the water droplet separator 24, and the front extension portion provided with the extension amount L ( 62). The front extension 62 extends beyond the shield plate 36 to the opposite side of the water droplet separator 24. That is, although all the fixing surfaces 57F of the upper fixing member 57 are the front end of the front extension part 62, when the position of this all fixing surface 57F is seen from the water droplet separator 24, the shielding plate 36 Is located farther away. The length (extension amount L) of this front side extension part 62 is determined according to the length of the space color 59.

On the other hand, as shown in the right half of FIG. 5, and FIG. 3, the position of the side edge 57S of the upper fixing member 57 adjacent to the edge part (all fixed surface 57F) by the side of the scavenging trunk primary compartment 25A side. A lateral extension portion 64 is formed by extending outwardly to the sunshade shape than the side surface 24S of the water droplet separator 24. In the present embodiment, the lateral extension 64 is not in contact with the intake buffer plate 41, but the lateral extension 64 may be extended until it is in contact with the intake buffer plate 41. In addition, in this embodiment, although the horizontal extension part 64 is formed only in the one side of the water droplet separator 24, you may form in both sides.

Moreover, along the side edge 57S of the upper fixing member 57 (fixing upper surface 57U), the fence part 66 of the vertical wall which stands up upward is formed. The fence portion 66 is such that, for example, the angle member 67 of the L-shaped cross-section shown in FIG. 6 is arranged along the side edge 57S of the upper fixing member 57, and the bolt 68 and the nut are provided on the upper surface 57U. It is formed by fixing to 69. Square partition plates 70 are fixed to both ends of the angle member 67 by welding or the like. In addition, in the present embodiment, the fence portion 66 is in contact with the intake buffer plate 41, and is not particularly fixed to the intake buffer plate 41, but the intake buffer plate 41 is welded, bolted, or the like to the fence portion 66. ), The angle member 67 forming the fence portion 66 can be utilized as a fixing tool for the upper fixing member 57, so that deformation, vibration, and the like of the upper fixing member 57 can be effectively suppressed.

Alternatively, the fence portion 66 may be slightly separated from the intake buffer plate 41. Further, the fence portion 66 may be formed by bending the side portion of the upper fixing member 57 (fixed upper surface 57U) upwardly over a predetermined width without using the angle member 67. Moreover, in the case of the layout in which the intake buffer plate 41 is not interposed between the water droplet separator 24 formed in multiple numbers, the lid member is covered so that the space | interval between each upper fixing member 57 may be covered, The lid member may be the lateral extension 64.

According to the droplet separator pollution prevention structure 47 comprised as mentioned above, as shown in FIG. 4, the inside of the scavenging trunk chamber 25 (25A, 25B) from the scavenging port 11 side after the diesel engine 1 is stopped. The drain oil DO dripping off is shielded by the upper fixing member 57 formed in the shape of a cover covering the upper surface 24U of the droplet separator 24, thereby preventing it from adhering to the droplet separator 24. . Further, when the drain oil DO dropped on the upper fixing member 57 is dropped from the front extension part 62 (front fixing surface 57F) formed at the tip of the upper fixing member 57, the water droplet separator ( It passes through the position separated by the extension amount L of the front side extension part 62 with respect to the front surface 24F of 24, and falls to the bottom part of 25 A of sweeping trunk | chamber primary compartments. For this reason, attachment of the drain oil DO to the water droplet separator 24 can be prevented more effectively.

In this way, since the drain oil DO, which drops off in the scavenging trunk chamber 25 (25A, 25B) from the scavenging port 11 side after the engine stops, is not attached to the drip separator 24, the drip separator 24. ), The drain oil (DW) is mixed with the drain water (DW) separated from the suction sweep air, and flows directly into the drain water discharge pipe (33), thereby effectively eliminating the fear of contaminating the environment.

Moreover, with respect to the shielding plate 36 which prevents drain oil DO from flowing to the water droplet separator 24 side, all the fixing surfaces 57F which form the front-end | tip of the front side extension part 62 are this shielding plate 36 Since the drain oil DO dropped on the upper fixing member 57 is dripped downward from the fixing surface 57F because it is pushed to the opposite side of the water droplet separator 24 beyond just above the water droplet separator ( 24 falls reliably to the bottom of the scavenging trunk primary compartment 25A, which is an area on the opposite side of the water droplet separator 24 rather than the shielding plate 36, and is formed at the bottom of the scavenging trunk primary compartment 25A. The drain oil discharge pipe 39 is recovered. For this reason, it is possible to effectively prevent the drain oil DO from adhering to the water droplet separator 24 or flowing into the drain water discharge pipe 33 into which the drain water DW separated by the water droplet separator 24 flows. .

Moreover, since the fence part 66 on the vertical wall which stood up along the side edge 57S of the upper fixing member 57 was formed, the drain oil DO which fell on the upper fixing member 57, It is blocked by the fence portion 66 and does not flow downward from the side edge 57S of the upper fixing member 57, but flows downward from the tip of the upper fixing member 57, that is, all of the fixing surface 57F. For this reason, in particular, attachment of the drain oil DO to the side surface of the water droplet separator 24 can be effectively prevented. Moreover, the fence part 66 makes the angle material 67 of an L-shaped cross section along the side surface 57S of the upper fixing member 57, and is attached to the upper surface of the upper fixing member 57 (fixed upper surface 57U). Since it is formed by fixing, it can form easily and inexpensively. Since the partition plate 70 is formed in the fence portion 66, the drain oil DO flows from the gap generated in the rear fixing surface 57R of the upper fixing member 57 and the corner portion of the fence portion 66. Coming out is prevented.

Further, the position of the side edge 57S of the upper fixing member 57 is extended to the sunshade shape outward from the side of the water droplet separator 24 to form a transverse extension portion 64, thereby forming a drop on the upper fixing member 57. Drained drain oil DO is blocked by the lateral extension 64 so as not to flow down the side of the water droplet separator 24. Also in this respect, it is possible to effectively prevent the drain oil DO from adhering to the side surface 24S of the water droplet separator 24. In addition, when water droplet separators 24 are arranged side by side horizontally and a space is formed between each of the water droplet separators 24, the lateral extension of the upper fixing member 57 of each water droplet separator 24 is provided. The sections 64 may be connected to each other.

This water droplet contaminant preventing structure 47 is very simple because it can be configured by only slightly changing the shape of the upper fixing member 57 for fixing the upper portion of the water droplet separator 24 in the air conduit 22. It can be configured inexpensively. And according to the ship provided with this droplet separator pollution prevention structure 47, in the air conduit 22 which connects between the scavenging port 11 of the engine and the turbocharger 18 by a simple and inexpensive structure. The drain oil DO, which flows back from the scavenging port 11 side, is prevented from being attached to the water separator 24 so that the drain oil DO is separated into the drain water DW separated from the intake air by the water separator 24. This mixture can be prevented from being discharged to the outside as it is and can contribute to marine environmental conservation.

[Second Embodiment]

7 is a longitudinal cross-sectional view showing a second embodiment of the droplet separator contamination prevention structure. In this water droplet separator contamination prevention structure 71, the water droplet separator contamination prevention structure 47 of the first embodiment shown in FIG. 4 except for the configuration near the front extension 72 that forms the tip end of the upper fixing member 57. Since it is the same structure as that, the same code | symbol is attached | subjected to the same part and description is abbreviate | omitted.

In this water droplet separator contamination prevention structure 71, the entire fixing surface 57F constituting the front extension portion 72 of the upper fixing member 57 is disposed on the front surface of the water droplet separator 24 without a space color or the like interposed therebetween. The bolt 73 is directly fastened to the 24F. And all the fixing surface 57F sags vertically downward from the front-side edge of the fixing part upper surface 57U, and from the front surface 24F of the water droplet separator 24 in the position below the fastening bolt 73. It is bent in the distant direction, and the inclined surface 57I is formed. Although the angle of this inclined surface 57I is 30 degree with respect to horizontal, for example, it is good also as a smaller angle. In short, the inclined surface 57I may be lowered from the root side toward the tip side. And the extension amount L of the front side extension part 72 from the front surface 24F of the water droplet separator 24 is the front side extension part 62 in the water droplet separator contamination prevention structure 47 of 1st Embodiment. Is set in the same manner as the extension amount (L).

In the droplet separator pollution prevention structure 71 configured in this manner, the drain oil DO dropping off the scavenging trunk chamber 25 (25A, 25B) from the scavenging port 11 side of the engine is an upper fixing member ( 57 is shielded by the inclined surface and flows along the inclined surface 57I, and passes through a position away from the front surface 24F of the water droplet separator 24 by the extension amount L of the front extension 72. It falls in the bottom part of 25A. At this time, the drain oil DO falls on the opposite side of the shield plate 36 as seen from the water droplet separator 24. For this reason, it is possible to prevent the drain oil DO from adhering to the water separator 24.

According to this water droplet separator contamination prevention structure 71, since the front end portion of the upper fixing member 57 can be directly attached to the bolt 73 without using a space color, the water droplet of the first embodiment Similar to the separator contamination prevention structure 47, while preventing the contamination of the water droplet separator 24, the number of parts can be omitted and the assembly can be facilitated to reduce the manufacturing cost.

In addition, this invention is not limited only to the structure of the said embodiment, A suitable change and improvement can be added within the range which does not deviate from the summary of this invention, and embodiment which added a change and improvement in this way also this invention Shall be included in the scope of rights.

For example, the droplet separator pollution prevention structure which concerns on this invention is not limited to a diesel engine as long as it is an engine provided with a supercharger, It is applicable to other types of engines. Moreover, when applying to a diesel engine, it is not necessarily a 2-cycle diesel engine of a uniflow system. Furthermore, it can be applied widely to engines other than a ship.

1: diesel engine
11: scavenging port
12: scavenging passage
18 turbocharger (supercharger)
22: air conduit
23: air cooler
24: soaking separator
25: sweeping trunk room
25A: Scavenged trunk primary compartment
25B: Scavenged Trunk 2nd Cabin
36: shielding plate (edge)
47: water droplet separator pollution prevention structure
57: upper fixing member
57S: side edge of the upper fixing member
62: front extension
64: lateral extension
66: fence part
67: angle material
DO: Drain Oil
DW: Drainage

Claims (8)

In the air conduit connecting between the supercharger and the scavenging port of the engine, an air cooler, a water droplet separator, and a scavenging trunk compartment are formed in order from the supercharger side,
As a water droplet separator contamination prevention structure of the cleaning air in the case where the said air purifier trunk | bulb extends upwards of the said water droplet separator, and is connected to the said scavenging port side,
An upper fixing member is formed in a cover covering the upper surface of the water separator so that the top of the water separator is fixed in the air conduit so that the drain oil dripping from the scavenging port side does not fall into the water separator after the engine stops. Together,
The sweeping air of the upper fixing member is formed by extending the end of the scavenging trunk chamber side in a sunshade shape to form a front extending portion, and the front end portion of the upper fixing member sagging downward from the front edge of the upper surface of the fixing portion. Watertight separator pollution prevention structure. The method according to claim 1,
In the bottom part of the said scavenger trunk compartment, and also near the said water droplet separator, the base part which prevents the drain oil from flowing to the said water separator | separator side is formed, The said front side extension part is just over the said base part, and the said water droplet separator Droplet separator contamination prevention structure of the cleaning air, characterized in that pushing out to the opposite side. In the air conduit connecting between the supercharger and the scavenging port of the engine, an air cooler, a water droplet separator, and a scavenging trunk compartment are formed in order from the supercharger side,
As a water droplet separator contamination prevention structure of the cleaning air in the case where the said air purifier trunk | bulb extends upwards of the said water droplet separator, and is connected to the said scavenging port side,
An upper fixing member is formed in a cover covering the upper surface of the water separator so that the top of the water separator is fixed in the air conduit so that the drain oil dripping from the scavenging port side does not fall into the water separator after the engine stops. Together,
A water droplet separator contamination prevention structure for cleaning air, characterized in that a vertical wall-shaped fence portion stands up along a side edge of the upper fixing member adjacent to an end portion of the scavenging trunk chamber side. The method of claim 3, wherein
And said fence portion is formed by fixing an angle member having an L-shaped cross section along the side edge and fixing it to an upper surface of the upper fixing member. In the air conduit connecting between the supercharger and the scavenging port of the engine, an air cooler, a water droplet separator, and a scavenging trunk compartment are formed in order from the supercharger side,
As a water droplet separator contamination prevention structure of the cleaning air in the case where the said air purifier trunk | bulb extends upwards of the said water droplet separator, and is connected to the said scavenging port side,
An upper fixing member is formed in a cover covering the upper surface of the water separator so that the top of the water separator is fixed in the air conduit so that the drain oil dripping from the scavenging port side does not fall into the water separator after the engine stops. Together,
A water droplet separator contamination prevention structure for cleaning air, characterized in that a transverse side extending portion is formed by extending the position of the side edge of the upper fixing member adjacent to the end of the scavenging trunk chamber side outward from the side of the water droplet separator. The method according to claim 1,
A water droplet separator contamination prevention structure for cleaning air, characterized in that a vertical wall-shaped fence portion stands up along a side edge of the upper fixing member adjacent to an end portion of the scavenging trunk chamber side. The method according to claim 1 or 3,
A water droplet separator contamination prevention structure for cleaning air, characterized in that a transverse side extending portion is formed by extending the position of the side edge of the upper fixing member adjacent to the end of the scavenging trunk chamber side outward from the side of the water droplet separator. The ship provided with the water droplet separator of the sweep air of any one of Claims 1-7.

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