WO2013039106A1 - 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

Drain oil flowing back from the scavenging-port side of an engine is prevented from adhering to a water droplet separator using a simple and inexpensive configuration. A contamination-preventing structure (47) for a scavenging-air water droplet separator is provided with an air cooler, a water droplet separator (24), and a scavenging trunk chamber (25) in the stated order from a supercharger side within an air guide pipe (22) linking a supercharger and a scavenging port of the engine, and when the scavenging trunk chamber (25) extends towards the location above the water droplet separator (24) and is connected to the scavenging port, an upper securing member (57) for securing the upper section of the water droplet separator (24) in the air guide pipe (22) is shaped as a cover covering the upper surface of the water droplet separator (24), and the scavenging trunk chamber (25) side end of the upper securing member (57) is extended in a manner resembling eaves and a front-side extended section (62) is formed, so that drain oil dripping from the scavenging port side into the scavenging trunk chamber (25) after the engine has been stopped does not fall on the water droplet separator (24).

Description

Water droplet separator for cleaning air and contamination preventing structure and ship provided with the same

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a water droplet separator contamination preventing structure for cleaning air attached to a large diesel engine or the like equipped with a supercharger, and a ship equipped with the same.

Many large-sized diesel engines for ships are equipped with a turbocharger represented by a turbocharger or the like to increase engine efficiency. Since the air supplied to the engine generates heat due to heat of compression when compressed by the turbocharger, an air cooler is provided to cool this heat. The compressed and heated air generates a large amount of drain water as it is cooled in the air cooler. If compressed air (hereinafter referred to as "cleaning air") containing this drain water is supplied to the engine as it is, water may corrode the sliding surface of the cylinder liner, etc. As disclosed, a water droplet separator (drain separator) is installed on the downstream side of the air cooler, where the drain water contained in the cleaning air is separated by condensation and only the cleaning air from which water has been removed Supplied to the engine (scavenged air). The drain water separated by the water droplet separator is discharged overboard (such as the sea) through a drain water discharge pipe.

In a diesel engine for marine engines, as disclosed in Patent Document 1, cleaning air from which drain water is removed by a water droplet separator extends upward from the water droplet separator, a scavenging trunk primary chamber And it is a layout supplied to the scavenging port of the engine through the scavenging air trunk secondary room. On the other hand, part of the oil supplied to lubricate between the cylinder liner of the engine and the piston drips as drain oil from the scavenging port side into the scavenging trunk secondary chamber and the scavenging trunk primary chamber after the engine stops. . For this reason, a drain oil discharge pipe for discharging the drain oil is disposed at the bottom of the scavenging air trunk primary chamber which is the lowest position. Since the water drop separator faces the scavenging trunk primary chamber, the bottom of the scavenging trunk primary chamber and the water drop separator are provided so that the drain oil that has fallen to the bottom of the scavenging trunk primary chamber does not flow to the water drop separator side. There is provided a wedge-shaped shield plate and a step portion which is higher on the water droplet separator side.

Patent No. 4233878 JP 11-350964 A

Conventionally, as described above, when drain oil drips down from the scavenging port side after engine stop, the drain oil often adheres to the water droplet separator across the shielding plate and the step portion. . The drain oil adhering to the water droplet separator in this way flows into the drain water discharge pipe together with the drain water adhering to the water droplet separator, and is discharged to the outside as it is, which may cause environmental pollution. There has been no improvement to this issue.

SUMMARY OF THE INVENTION The present invention is a water droplet separator contamination preventing structure for cleaning air capable of preventing drain oil backflowing from the scavenging port side of the engine from adhering to the water droplet separator by a simple and inexpensive configuration, and a ship equipped with this Intended to provide.

According to a first aspect of the water droplet separator contamination preventing structure for cleaning air according to the present invention, an air cooler and water droplets are sequentially arranged in the air conduit connecting between the turbocharger and the scavenging port of the engine from the turbocharger side. A separator and a scavenging air trunk chamber, wherein the scavenging air trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side. An upper fixing member for fixing an upper portion of the water droplet separator in the air conduit so that drain oil dripping from the scavenging port side after the engine stops does not fall on the water droplet separator; It is characterized in that it is formed in the shape of a cover that covers the upper surface of the vessel, and the end portion of the upper fixing member on the scavenging trunk chamber side is extended in a bowl shape to form a front extension.

According to the above configuration, the upper fixing member for fixing the upper portion of the water droplet separator in the air conduit also functions as a cover covering the upper surface of the water droplet separator. Shield the dripping drain oil against the water drop separator. For this reason, it is prevented that drain oil adheres to a water droplet separator.
Furthermore, the drain oil dripping on the upper fixing member drips from the tip of the front side extension formed by extending the scavenging trunk chamber side end of the upper fixing member into a bowl shape. At this time, the dripping drain oil passes through a position away from the surface on the scavenging air trunk side of the water droplet separator by the amount of extension of the front extension and falls to the bottom of the scavenging air trunk. For this reason, it is possible to more effectively prevent the drain oil from adhering to the water droplet separator.
As described above, the drain oil dripping from the scavenging port after the engine stops does not adhere to the water droplet separator, so the drain oil is mixed with the drain water separated from the cleaning air for suction by the water droplet separator. It is possible to effectively prevent events such as flowing into the discharge pipe and contaminating the environment.
In addition, this water droplet separator pollution prevention structure can be configured simply by slightly changing the shape of the upper fixing member for fixing the upper portion of the water droplet separator in the air conduit, so that the structure is simple and inexpensive. Can.

In the second aspect of the water droplet separator contamination preventing structure of cleaning air according to the present invention, in the first aspect, the drain oil is disposed on the bottom of the scavenging trunk chamber and at a position closer to the water droplet separator. A wedging portion is provided to prevent flow to the separator side, and the front side extension portion protrudes beyond just above the weir stopping portion to the opposite side of the water droplet separator.

According to the above configuration, when the drain oil dripping on the upper fixing member drops from the front end of the front extension, the area on the opposite side of the water drop separator than the water blocking part without being applied to the water drop separator The air is dropped to the bottom of the scavenging air trunk chamber, and is collected to the drain oil discharge pipe provided at the bottom of the scavenging air trunk chamber. For this reason, it is possible to prevent the drain oil from adhering to the water droplet separator or from 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 contamination prevention structure for cleaning air according to the present invention, an air cooler and water droplets are sequentially arranged in the air conduit connecting between the turbocharger and the scavenging port of the engine from the turbocharger side. A separator and a scavenging air trunk chamber, wherein the scavenging air trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side. An upper fixing member for fixing an upper portion of the water droplet separator in the air conduit so that drain oil dripping from the scavenging port side after the engine stops does not fall on the water droplet separator; Of the upper fixing member, and a vertical wall-shaped fence portion is provided along the side adjacent to the end portion on the scavenging trunk chamber side of the upper fixing member. The features.

According to the above configuration, as in the case of the first aspect, the upper fixing member functions as a cover that covers the upper surface of the water droplet separator, and drain oil dripping from the scavenging port side when the engine stops is used as a water droplet separator. Shield to prevent contamination of the water drop separator.
Moreover, the drain oil dripping on the upper fixing member is blocked by the vertical wall-shaped fence portion provided on the upper fixing member and does not flow downward from the side of the upper fixing member. It flows down from the tip of the end on the side of the scavenging air trunk chamber. Therefore, it is possible to effectively prevent the drain oil from adhering particularly to the side surface of the water droplet separator.

In the fourth aspect of the water droplet separator contamination preventing structure for cleaning air according to the present invention, in the third aspect, the fence portion has an angle member with an L-shaped cross section along the side edge to fix the upper portion It is characterized in that it is provided by being fixed to the upper surface of the member.

According to the above configuration, the fence portion can be formed simply and inexpensively. And since the above-mentioned angle material can be shared as a fixing tool of an upper fixed member, a modification, vibration, etc. of an upper fixed member can be controlled effectively.

According to a fifth aspect of the water droplet separator contamination preventing structure for cleaning air according to the present invention, an air cooler and water droplets are sequentially arranged in the air conduit connecting between the turbocharger and the scavenging port of the engine from the turbocharger side. A separator and a scavenging air trunk chamber, wherein the scavenging air trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side. An upper fixing member for fixing an upper portion of the water droplet separator in the air conduit so that drain oil dripping from the scavenging port side after the engine stops does not fall on the water droplet separator; Of the upper fixing member, the position of the side adjacent to the end on the side of the scavenging trunk chamber is extended in the form of a hook outward from the side of the water droplet separator Characterized in that the formation of the lateral extensions Te.

According to the above configuration, as in the case of the first and second aspects, the upper fixing member functions as a cover for covering the upper surface of the water droplet separator, and drain oil dripping from the scavenging port side into the water droplet separator. Shield to prevent contamination of the water drop separator.
In addition, since the bowl-shaped lateral extension portion provided on the side of the upper fixing member is extended outward in a bowl shape than the side of the water droplet separator, the drain dripping on the upper fixing member Oil is blocked by the lateral extensions and does not flow down the sides of the water drop separator. Therefore, it is possible to effectively prevent the drain oil from adhering particularly to the side surface of the water droplet separator.

A sixth aspect of the water droplet separator contamination preventing structure for cleaning air according to the present invention is, in the first aspect, along the side adjacent to the end on the scavenging trunk chamber side of the upper fixing member, It is characterized in that a vertical wall-shaped fence portion is provided to stand upward.

According to the above configuration, the upper fixing member functions as a cover for covering the upper surface of the water droplet separator, and drain oil dripping from the scavenging port side is shielded against the water droplet separator to prevent contamination of the water droplet separator. Also, drain oil dripping on the upper fixing member drips from the tip of the front extension of the upper fixing member, and passes a position away from the scavenging trunk chamber side by the amount of extension of the front extension. It is possible to effectively prevent the drain oil from adhering to the water droplet separator as it falls to the bottom of the scavenging air trunk chamber.
Furthermore, the drain oil dripping on the upper fixing member is blocked by the vertical wall-shaped fence portion provided on the upper fixing member and does not flow downward from the side of the upper fixing member, so that the drain oil It flows downward from the tip. Therefore, it is possible to effectively prevent the drain oil from adhering particularly to the side surface of the water droplet separator.

The seventh aspect of the water droplet separator contamination preventing structure of cleaning air according to the present invention is the first or third aspect, wherein a side of the upper fixing member adjacent to the end portion on the scavenging trunk chamber side is It is characterized in that the position is extended in a bowl-like shape outward than the side surface of the water droplet separator to form a lateral extension.

According to the above configuration, in addition to the operation and effect in the first or third aspect, the bowl-shaped lateral extension provided on the side of the upper fixing member is more outward than the side of the water droplet separator By extending like a bowl, the drain oil dripping on the upper fixing member is blocked by the lateral extension and does not flow down the side of the water droplet separator, and the drain oil adheres to the side of the water droplet separator. It can be effectively prevented.

A ship according to the present invention is characterized by including the water droplet separator according to any one of the first to seventh aspects.

According to this ship, with a simple and inexpensive configuration, it is prevented that the drain oil, which flows backward from the scavenging port side, adheres to the water droplet separator in the air conduit connecting between the scavenging port of the engine and the turbocharger. It is possible to prevent the drain oil from being mixed into the drain water separated from the intake air by the water droplet separator and discharged as it is to the outside.

As described above, according to the water droplet separator contamination preventing structure for cleaning air and the ship provided with the same of the present invention, drain oil flowing back from the scavenging port side of the engine can be used as the water droplet separator by the simple and inexpensive configuration. It is possible to prevent adhesion.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view which shows the structural example of the large sized diesel engine for ships, a supercharger, an air conduit, etc. which comprised the water droplet separator contamination prevention structure of the cleaning air which concerns on one Embodiment of this invention. It is the longitudinal cross-sectional view which expanded the air conduit, the scavenging air trunk room, the water droplet separator etc. which are shown in FIG. It is a front view of the water droplet separator etc. by III arrow of FIG. FIG. 4 is a longitudinal sectional view taken along the line IV-IV of FIG. 3, showing a first embodiment of a water droplet separator contamination preventing structure. It is the V section enlarged view of FIG. It is a perspective view of an angle material which constitutes a fence part. It is a longitudinal cross-sectional view which shows 2nd Embodiment of a water droplet separator contamination prevention structure.

In the following, two embodiments of the present invention will be described with reference to FIGS.

First Embodiment
FIG. 1 is a longitudinal sectional view showing a structural example of a large-sized diesel engine for ships, a supercharger, an air conduit, and the like provided with a structure for preventing water droplet separation and contamination of cleaning air according to an embodiment of the present invention.

The diesel engine 1 is, for example, a known uniflow two-stroke multi-cylinder engine, and a cylinder liner 4 is provided inside a cylinder jacket 3 installed on the crankcase 2. A head 5 is provided. A cylinder bore 6 is formed inside the cylinder liner 4, and a piston 7 is slidably inserted into the cylinder bore 6. It is well known that a piston rod 8 is connected to the piston 7 and the lower end of the piston rod 8 is connected to the crankshaft via a connecting rod (not shown).

At the lower part of the cylinder liner 4, a plurality of scavenging ports 11 are formed side by side in the circumferential direction. Further, a scavenging passage 12 is defined inside the cylinder jacket 3 so as to surround the scavenging ports 11. On the other hand, at the top of the cylinder head 5, an exhaust port 13 and an exhaust valve 14 for opening and closing the exhaust port 13 are provided. The exhaust valve 14 is driven to open and close by a cam shaft (not shown) or an electromagnetically controlled hydraulic device, and opens in synchronization with the timing at which the piston 7 ascends in the cylinder bore 6.

Exhaust ports 13 of a plurality of cylinders of the diesel engine 1 are connected to cylindrical static exhaust pressure chambers 17 (surge tanks) along the cylinder arrangement direction via exhaust pipes 16 respectively. The exhaust turbine side flow path 19 of the charger 18 (supercharger) is connected. Further, the intake turbine side flow passage 20 of the turbocharger 18 is connected to the scavenging passage 12 through an air conduit 22 having a substantially U-shaped longitudinal cross-sectional shape. The air cooler 23 and the water droplet separator 24 are installed in the air conduit 22 sequentially from the turbocharger 18 side, and the downstream side of the water droplet separator 24 and the portion where the air conduit 22 is connected to the scavenging passage 12 A scavenging trunk 25 extending in the vertical direction is disposed. The air cooler 23 and the water droplet separator 24 are provided with multilayer air passages (not shown), and are internally cooled by a refrigerant such as cooling water.

The water droplet separator 24 is installed at the bottom of the scavenging air chamber 25, and the scavenging air chamber 25 extends upward from the water droplet separator 24 and is connected to the air scavenging port 11, and is located on the lower side (upstream side) And a scavenging trunk secondary chamber 25B located on the upper side (downstream side). A plurality of reed valve-like scavenging valves 28 are provided on a dividing wall plate 27 which obliquely separates the scavenging air trunk primary chamber 25A from the scavenging air trunk secondary chamber 25B. The scavenging valve 28 is a check valve that passes only the air flow from the scavenging trunk primary chamber 25A to the scavenging trunk secondary chamber 25B and blocks the air flow in the reverse direction. In addition, an auxiliary blower 29 is provided which allows communication between the scavenging trunk primary chamber 25A and the scavenging trunk secondary chamber 25B with a small opening area.

When the diesel engine 1 operates, high-temperature, high-pressure exhaust gas flows from the exhaust port 13 through the exhaust pipe 16 and the static exhaust pressure chamber 17 to the exhaust turbine side flow path 19 of the turbocharger 18 to drive the turbine of the turbocharger 18 at high speed. Rotate at. As a result, outside air is taken into the turbocharger 18 and compressed, and then passes through the intake turbine side flow passage 20 and enters the air conduit 22 as cleaning air. Since the cleaning air generates heat due to compression heat, it is cooled when passing through the air cooler 23. At that time, a large amount of drain water is generated, so the water drop separator 24 provided on the downstream side of the air cooler 23 removes moisture by condensation and becomes dry air and the scavenging trunk primary chamber 25A and the scavenging trunk 2 It passes through the next chamber 25 B, and passes through the scavenging passage 12 to be supercharged into the cylinder bore 6 from the plurality of scavenging ports 11.

As shown in an enlarged manner in FIG. 2, the water droplet separator 24 has a substantially rectangular parallelepiped shape and is installed inside the scavenging trunk primary chamber 25A. 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 immediately below the water droplet separator 24, and the drain water separated by the water droplet separator 24 is The water is discharged over the water (e.g., the sea) through the drain water discharge hole 32 and the drain water discharge pipe 33. Further, at the bottom of the scavenging trunk primary chamber 25A and at a position close to the water droplet separator 24, there is provided a bowl-shaped shielding plate 36 (boilerling portion) standing up. A drain oil discharge hole 38 and a drain oil discharge pipe 39 are disposed at the bottom of the scavenging trunk primary chamber 25A opposite to the water droplet separator 24 with the shield plate 36 interposed therebetween. The shielding plate 36 is also a supporting member of the water droplet separator 24 as 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, and the scavenging valve 28 provided on the partition plate 27. The water drips into the scavenged air trunk chamber 25 (25A, 25B) as drain oil through the gap of the above and flows down to the bottom of the scavenged air trunk primary chamber 25A. The drain oil thus dropped is prevented from moving toward the water droplet separator 24 by the shield plate 36, and is stored in a waste oil tank (not shown) through the drain oil discharge hole 38 and the drain oil discharge pipe 39. As shown in FIGS. 2 and 3, the inside of the scavenging trunk primary chamber 25 A is partitioned by a plurality of intake buffer plates 41 installed in parallel along the longitudinal direction of the engine. An intake flow hole 42 is bored substantially at the center, and a notch-like drain oil flow portion 43 for smoothly flowing the drain oil to the drain oil discharge pipe 39 is formed at the lower portion of the intake buffer plate 41 ing.

Next, the water droplet separator contamination prevention structure 47 will be described.
The vertical wall 49 (see FIGS. 2 and 4) between the scavenging trunk primary chamber 25A and the room in which the air cooler 23 is provided has an opening for passing the cleaning air pumped from the turbocharger 18. A portion 50 is formed, and the water droplet separator 24 is attached to the vertical wall portion 49 so as to close the opening 50. Here, in order to facilitate the description, among the surfaces constituting the water droplet separator 24, the surface facing the vertical wall 49 is called "rear surface 24R", and the surface facing the scavenging trunk primary chamber 25A is " It is called "front surface 24F", the surface parallel to the intake buffer plate 41 is called "side surface 24S", and the upper surface is given a reference 24U. As shown in FIGS. 2 to 5, the water droplet separator 24 has its side surface 24S fixed to the vertical wall 49 by the mounting bracket 53 and bolt 54 using an angle material or the like, while the lower portion of the front surface 24F is a shielding plate It is superimposed on 36 and fixed by a bolt 55. In addition, the upper portion of the water droplet separator 24 is fixed to the vertical wall 49 via the upper fixing member 57.

The upper fixing member 57 covers the upper surface 24U of the water droplet separator 24 so that the drain oil dripping from the scavenging port 11 side into the scavenging trunk chamber 25 (25A, 25B) after the engine stops does not fall on the water droplet separator 24. It is formed in the shape of a cover. As shown in FIG. 4, the upper fixing member 57 has a fixing portion upper surface 57U parallel to the upper surface 24U of the water droplet separator 24 with a space, and a vertical wall 49 rising from the rear edge of the fixing portion upper surface 57U. A rear fixing surface 57R to be fastened at 58, and a front fixing surface 57F to be fastened to the front surface 24F of the water droplet separator 24 by bolts 60 hanging down the space collar 59 from the front edge of the fixing portion upper surface 57U There is.

An end portion of the upper fixing member 57 on the scavenging trunk primary chamber 25A side is extended in a bowl shape with respect to the front surface 24F of the water droplet separator 24 and forms a front extension portion 62 having an extension amount L. The front extension 62 extends beyond just above the shield plate 36 to the opposite side of the water droplet separator 24. That is, although the front fixing surface 57F of the upper fixing member 57 is the tip of the front extension 62, the position of the front fixing surface 57F is farther from the water droplet separator 24 than the shielding plate 36. positioned. The length (length L) of the front extension 62 is determined by the length of the space collar 59.

On the other hand, as shown in the right half of FIG. 5 and FIG. 3, the position of the side 57S adjacent to the end (front fixing surface 57F) of the upper fixing member 57 on the scavenging trunk primary chamber 25A side is a water droplet separator. The lateral side extension portion 64 is formed to extend outward like a bowl from the side surface 24S of 24. In the present embodiment, the lateral extension portion 64 is not in contact with the intake buffer plate 41, but the lateral extension portion 64 may be extended until it contacts the intake buffer plate 41. Further, in the present embodiment, the lateral extensions 64 are provided only on one side of the water droplet separator 24, but may be provided on both sides.

Further, along the side 57S of the upper fixing member 57 (the upper surface 57U of the fixing portion), a fence portion 66 in the shape of a vertical wall standing up is provided. The fence portion 66 is provided, for example, by fixing an angle member 67 having an L-shaped cross section also shown in FIG. 6 along the side 57S of the upper fixing member 57 and fixing it to the upper surface 57U with a bolt 68 and a nut 69. Square partition plates 70 are fixed to both ends of the angle member 67 by welding or the like. 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 fence portion 66 is fixed to the intake buffer plate 41 by welding or bolting. By doing this, the angle member 67 forming the fence portion 66 can be used as a fixing tool for the upper fixing member 57, and 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. Furthermore, the fence portion 66 may be formed by bending the side portion of the upper fixing member 57 (the fixing portion upper surface 57U) upward along a predetermined width without using the angle member 67. In the case of a layout in which the intake buffer plate 41 does not intervene between a plurality of water drop separators 24, a lid member is covered so as to cover the gaps between the respective upper fixing members 57, and this lid member is The lateral extension 64 may be used.

According to the water droplet separator contamination prevention structure 47 configured as described above, as shown in FIG. 4, after the diesel engine 1 is stopped, dripping from the scavenging port 11 side into the scavenging trunk chamber 25 (25A, 25B) The falling drain oil DO is shielded by the cover-like upper fixing member 57 covering the upper surface 24 U of the water droplet separator 24 and is prevented from adhering to the water droplet separator 24. Furthermore, when the drain oil DO dripping on the upper fixing member 57 drops from the front extension 62 (the front fixing surface 57F) formed at the tip of the upper fixing member 57, the front surface of the water droplet separator 24 It falls to the bottom of the scavenging trunk primary chamber 25A by passing a position separated by an extension amount L of the front side extension 62 with respect to 24F. For this reason, adhesion of the drain oil DO to the water droplet separator 24 can be further effectively prevented.

As described above, since the drain oil DO dripping from the scavenging port 11 side into the scavenging air trunk chamber 25 (25A, 25B) after the engine stops does not adhere to the water droplet separator 24, cleaning air for suction by the water droplet separator 24 The drain oil DO is mixed with the drain water DW separated therefrom and flows into the drain water discharge pipe 33 as it is, so that the concern of contaminating the environment can be effectively eliminated.

Further, with respect to the shielding plate 36 which prevents the drain oil DO from flowing to the water droplet separator 24 side, the front fixing surface 57F forming the tip of the front side extension portion 62 passes just above the shielding plate 36. Since it is protruded to the opposite side of the water droplet separator 24, the drain oil DO dripping on the upper fixing member 57 is blocked without being applied to the water droplet separator 24 when dripping downward from the front fixing surface 57F. The bottom of the scavenging trunk primary chamber 25A, which is the area on the opposite side of the water droplet separator 24 from the plate 36, falls reliably and is collected in the drain oil discharge pipe 39 provided at the bottom of the scavenging trunk primary chamber 25A. For this reason, it can be effectively prevented that the drain oil DO adheres to the water droplet separator 24 or flows into the drain water discharge pipe 33 into which the drain water DW separated by the water droplet separator 24 flows.

Furthermore, since the vertical wall-shaped fence portion 66 which stands upward is provided along the side 57S of the upper fixing member 57, the drain oil DO dripping on the upper fixing member 57 is blocked by the fence portion 66. Thus, it does not flow downward from the side 57S of the upper fixing member 57, but flows downward from the tip of the upper fixing member 57, that is, the front fixing surface 57F. Therefore, it is possible to effectively prevent the drain oil DO from adhering particularly to the side surface of the water droplet separator 24. The fence portion 66 is provided by fixing the angle member 67 of L-shaped cross section along the side 57S of the upper fixing member 57 to the upper surface of the upper fixing member 57 (the upper surface of the fixing portion 57U). It can be formed simply and inexpensively. Since the fence portion 66 is provided with the partition plate 70, drain oil DO is prevented from flowing out from the gap formed at the corner between the rear fixing surface 57 R of the upper fixing member 57 and the fence portion 66.

Further, the position of the side 57S of the upper fixing member 57 is extended in a bowl shape outward from the side of the water droplet separator 24 to form the lateral extension 64, so that dripping on the upper fixing member 57 occurs. The drain oil DO which has fallen is blocked by the lateral extension 64 and does not flow down the side of the water droplet separator 24. Also in this respect, the drain oil DO can be effectively prevented from adhering to the side surface 24S of the water droplet separator 24. When several water droplet separators 24 are installed side by side, and a space is provided between the water droplet separators 24, the side extension 64 of the upper fixing member 57 of each water droplet separator 24 is used. They may be linked to each other.

The water droplet separator contamination prevention structure 47 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, so it is very simple and inexpensive. Can be configured. And, according to the ship provided with the water droplet separator contamination preventing structure 47, backflow from the scavenging port 11 side in the air conduit 22 connecting between the scavenging port 11 of the engine and the turbocharger 18 by a simple and inexpensive configuration. Prevents the drain oil DO from adhering to the water droplet separator 24, and prevents the drain oil DO from being mixed into the drain water DW separated from the intake air by the water droplet separator 24 and discharged as it is to the outside Can contribute to the conservation of the marine environment.

Second Embodiment
FIG. 7 is a longitudinal sectional view showing a second embodiment of the water droplet separator contamination preventing structure. In the water droplet separator contamination preventing structure 71, the structure is the same as that of the water droplet separator contamination preventing structure 47 of the first embodiment shown in FIG. 4 except for the configuration in the vicinity of the front extension 72 forming the tip of the upper fixing member 57. Since there is the same part, the same symbol is attached to the same part and the description is omitted.

In the water droplet separator contamination preventing structure 71, the front fixing surface 57F constituting the front extension 72 of the upper fixing member 57 is directly bolted to the front surface 24F of the water droplet separator 24 without sandwiching a space collar or the like. It is tightened. The front fixing surface 57F is vertically bent from the front edge of the upper surface 57U of the fixing portion and then bent away from the front surface 24F of the water droplet separator 24 at a position below the fastening bolt 73 and inclined. The surface 57I is formed. The angle of the inclined surface 57I is, for example, 30 degrees with respect to the horizontal, but may be shallow. That is, the inclined surface 57I may be lowered from the root side toward the tip side. The extension L of the front extension 72 from the front surface 24F of the water droplet separator 24 is set equal to the extension L of the front extension 62 in the water droplet separator contamination preventing structure 47 of the first embodiment. There is.

In the water droplet separator pollution prevention structure 71 configured as described above, the drain oil DO dripping from the scavenging port 11 side of the engine into the scavenging trunk chamber 25 (25A, 25B) is shielded by the upper fixing member 57, Further, it flows along the inclined surface 57I, passes by a distance L from the front surface 24F of the water droplet separator 24 by the extension amount L of the front extension 72, and falls to the bottom of the scavenging trunk primary chamber 25A. At this time, the drain oil DO falls on the other side of the shield plate 36 as viewed from the water droplet separator 24. Therefore, the drain oil DO can be prevented from adhering to the water droplet separator 24.

According to the water droplet separator contamination preventing structure 71, since the front end portion of the upper fixing member 57 can be directly fastened with the bolt 73 without using the space collar, it is similar to the water droplet separator contamination preventing structure 47 of the first embodiment. In addition, while preventing the water droplet separator 24 from being contaminated, the number of parts can be reduced, the assembly can be facilitated, and the manufacturing cost can be reduced.

The present invention is not limited to only the configuration of the above embodiment, and modifications and improvements can be made as appropriate without departing from the scope of the present invention, and such modifications and improvements can be made. The form is also included in the scope of the present invention.
For example, the water droplet separator pollution prevention structure according to the present invention can be applied not only to a diesel engine but also to other types of engines as long as the engine is equipped with a turbocharger. When applied to a diesel engine, it may not necessarily be a uniflow two-stroke diesel engine. Furthermore, it can be widely applied to engines other than ships.

1 diesel engine 11 scavenging port 12 scavenging passage 18 turbocharger (supercharger)
22 Air Conduit 23 Air Cooler 24 Water Drop Separator 25 Scavenging Trunk Chamber 25A Scavenging Trunk Primary Chamber 25B Scavenging Trunk Secondary Chamber 36 Shielding Plate (Waterproof Part)
47 Water droplet separator pollution preventing structure 57 upper fixing member 57S side of upper fixing member 62 front extension 64 side extension 66 fence portion 67 angle member DO drain oil DW drain water

Claims (8)

An air cooler, a water droplet separator, and a scavenging trunk chamber are provided in order from the turbocharger side in an air conduit connecting between the turbocharger and the scavenging port of the engine.
A water droplet separator contamination preventing structure for cleaning air in the case where the scavenging air trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side,
An upper fixing member for fixing an upper portion of the water droplet separator in the air conduit such that drain oil dripping from the scavenging port side after the engine stop does not fall on the water droplet separator, the water droplet separator In the form of a cover covering the top of the
An end portion of the upper fixing member on the side of the scavenging trunk chamber is extended in a hook shape to form a front side extension portion. The bottom portion of the scavenging trunk chamber and a position close to the water droplet separator are provided with a wedging portion for preventing the drain oil from flowing to the water droplet separator side, and the front extension portion is a portion of the weir stopping portion The water droplet separator contamination preventing structure for cleaning air according to claim 1, characterized in that it extends beyond just above to the other side of the water droplet separator. An air cooler, a water droplet separator, and a scavenging trunk chamber are provided in order from the turbocharger side in an air conduit connecting between the turbocharger and the scavenging port of the engine.
A water droplet separator contamination preventing structure for cleaning air in the case where the scavenging air trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side,
An upper fixing member for fixing an upper portion of the water droplet separator in the air conduit such that drain oil dripping from the scavenging port side after the engine stop does not fall on the water droplet separator, the water droplet separator In the form of a cover covering the top of the
A vertical wall shaped fence portion is provided along the side adjacent to the end portion of the upper fixing member adjacent to the scavenging trunk chamber side, and a fence portion for cleaning air in the vertical direction is provided. . The water droplet separator according to claim 3, wherein the fence portion is provided by fixing an angle member having an L-shaped cross section along the side to the upper surface of the upper fixing member. Pollution prevention structure. An air cooler, a water droplet separator, and a scavenging trunk chamber are provided in order from the turbocharger side in an air conduit connecting between the turbocharger and the scavenging port of the engine.
A water droplet separator contamination preventing structure for cleaning air in the case where the scavenging air trunk chamber extends upward of the water droplet separator and is connected to the scavenging port side,
An upper fixing member for fixing an upper portion of the water droplet separator in the air conduit such that drain oil dripping from the scavenging port side after the engine stop does not fall on the water droplet separator, the water droplet separator In the form of a cover covering the top of the
The position of the side adjacent to the end on the side of the scavenging trunk chamber of the upper fixing member is extended in the form of a bowl outward from the side of the water droplet separator to form a lateral extension. Water vapor separator for cleaning air and pollution prevention structure. The vertical wall-like fence part which stands up upwards was provided along the side which adjoins the end by the side of the scavenging trunk room of the upper fixed member, The cleaning air according to claim 1 characterized by things Water drop separator pollution prevention structure. The position of the side adjacent to the end on the side of the scavenging trunk chamber of the upper fixing member is extended in the form of a bowl outward from the side of the water droplet separator to form a lateral extension. The water droplet separator contamination prevention structure of cleaning air according to claim 1 or 3. A vessel comprising the cleaning air drop separator according to any one of claims 1 to 7.

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