KR20040019314A - Turbocharge arrangement for a diesel engine - Google Patents

Abstract

The turbocharger for two-stroke diesel engines includes at least one supercharger (1) which acts as the exhaust air of the engine to supply the supercharged exhaust air to the engine, and downstream of the supercharger to reduce the temperature of the exhaust air. It consists of at least one air cooler (2) and an additional blower (4) designed to provide the engine with additional exhaust air and exhaust air pressure when the load is reduced to a predetermined value during operation.

The inlet of the blower 4 using at least one centrifugal force is connected to the outlet of the blower 4 using one centrifugal force connected to the outlet of the at least one intermediate cooler 2. On the other hand, the outlet is connected to an exhaust air container 5 belonging to the engine.

This results in a simple and inexpensive structure capable of effectively removing condensate from the supercharged and cooled exhaust air supplied to the diesel engine.

Description

Turbocharge arrangement for a diesel engine

The moisture contained in the original supercharged exhaust air will condense to a larger or smaller range as the air is cooled in the passages of the intermediate cooler.

If the condensed water moves along with the exhaust air into the engine's cylinder, the sleeve and piston can be seriously damaged. Therefore, moisture must generally be separated beforehand.

Patent document DE 199 11 252 discloses a water separator for removing water particles from the flow of compressed cooled exhaust air of a two-stroke diesel engine.

This disclosed water separator consists mainly of a centrifugal section having a lower exhaust compartment for collecting and draining water sprayed on the curved inner surface during the passage of exhaust air. The water separator has a significant effect, but the structure of the supercharger is complicated, increasing the manufacturing cost of each engine.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercharger of a two-stroke diesel engine, comprising: at least one supercharger returned by exhaust gas from an engine to supply supercharged exhaust air to the engine, and at least one supercharger to lower the temperature of the exhaust air. At least one intermediate cooler located downstream and at least one additional blower designed as a centrifugal blower to supply additional exhaust air and exhaust pressure to the engine when the load decreases to a predetermined value during operation It is made of.

The first object of the present invention is to provide a supercharger with a simple and inexpensive construction, as mentioned to everyone.

It is a second object of the present invention to provide a supercharger arrangement which, as mentioned in all, mainly employs and installs engine components that form part of this arrangement.

The third object of the invention is, as mentioned to everyone, a supercharger for removing condensed water in a more efficient manner than is known to date from the supercharged and cooled exhaust air supplied to diesel engines, ie two-stroke diesel engines. To provide.

A new and unique feature according to the invention is that the inlet of the blower using at least one centrifugal force is connected to the outlet of the at least one intermediate cooler, while the outlet of the blower is connected to the exhaust air container which forms part of the engine.

Generally, the supercharger consists of at least one supercharger operating with exhaust gas from an engine via a turbine and at least one intermediate cooler for cooling the exhaust air charged to a suitable temperature.

In addition, the supercharger typically consists of one or more additional blowers of the type with centrifugal force inserted to operate to compensate for the reduction of the supercharge effect when the engine load is reduced.

These centrifugal blowers are connected in parallel with a number of check valves arranged with large enough flow areas to allow full output at a higher load on the supercharger when the centrifugal blowers are not operated.

In addition, according to the present invention, the blower using the centrifugal force is utilized as a water separator, and allows the exhaust air to pass through the blower at large and small loads during operation.

Thereby, a significant advantage is obtained that the cost of conventional commercial water separators and check valves is reduced.

Furthermore, the blower using the centrifugal force can further remove the condensed water from the compressed-cooled exhaust air as compared to the conventional water separator.

Unlike a centrifugal cyclone, a blower that uses centrifugal force, as opposed to a centrifugal separator, separates compressed water from the exhaust air, throws it to the inner surface of the blower, transfers moisture to the outside of the blower, and delivers dry air to the engine cylinder. This is mainly due to the fact that it operates with a rotary fan wheel that generates an effective centrifugal force for blowing.

To increase this advantageous effect, each additional fan wheel is operated by an electric motor at a predetermined low load level such that it is always rotated during operation, and the internal combustion engine / at a high level above the exhaust air pressure of the internal combustion engine / supercharger. It is operated by the air flow generated by the supercharger.

As mentioned above, the present invention must go through a centrifugal blower in which all exhaust air is always utilized as an additional blower. In other words, these centrifugal blowers allow more exhaust air to pass effectively than conventionally.

Therefore, the centrifugal blower adopted has a maximum speed of about 50 m / s to exhaust air at full load and additional blowers used in conventional superchargers to meet the general demand for a blower with a minimum flow area. The figures should be set in a different way than.

According to the invention, the blower using the centrifugal force can be positioned in various ways, for example with a vertical, horizontal or inclined axis of rotation.

In a preferred embodiment, the blowers using each centrifugal force have a mainly horizontal axis of rotation.

According to the invention, the drain can be designed on the bottom of the housing of the blower using each centrifugal force. The compartment has a slit facing away from the flow direction of the exhaust air so that the separated condensate is directed into the compartment and an outlet for the collected condensate to face the exterior of the compartment.

As mentioned above, the separated condensate will flow along the curved inner side of the blower housing towards the outlet of the blower and enter the drain cell via a gap pointing away from the flow direction of the exhaust air.

In addition, in order to ensure that the condensate passing through the sump is collected by the blower and removed, the through plate is directed from the drain to the outlet side of the blower or upwards to the outlet of the blower. It can be located at a distance from the curved outer wall along the extending area. The plate together with the outer wall forms a drain channel which is opened in a drain box.

Under the influence of the circulating air, condensate that has not already been collected in the sump is forced into the drain channel via the through hole in the through plate, and then flows into the sump underneath under the influence of gravity in this channel.

In order to prevent the creation of reverse flow air which can counter the influence of gravity on the condensate in the drain channel, it is preferred that a flow resistance, for example a mesh inserted into the channel, is designed in the drain channel.

Further, a compartment is located between the drain channel so that the drain compartment is divided into a first section through which condensate flows in a gap facing the flow direction and a second section through which condensate flows in a gap facing the flow direction. By directing the separated condensate through each outlet outside each sump section, the opposite flow of condensate will effectively separate into the sump and the airflow will not be able to influence against the gravitational effect on the condensate.

As described, the turbocharger according to the present invention can effectively remove condensate from the supercharged, cooled exhaust air supplied to an operating two-stroke diesel engine.

Furthermore, when individual condensate is inserted between the inlet of the blower using the centrifugal force and the outlet of the intermediate cooler, additional safety is obtained which prevents condensate from penetrating into each engine cylinder with the exhaust air.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a turbocharger according to the invention.

FIG. 2 is a detailed upper side view of the turbocharger shown in FIG. 1.

3 shows a first embodiment of the turbocharger shown in FIGS. 1 and 2.

4 shows a second embodiment of the supercharger shown in FIGS.

5 is an enlarged cross-sectional view of the blower using the centrifugal force of the turbocharger shown in FIGS. 3 and 4;

FIG. 6 is an enlarged view of a partial view of a curved wall of the exhaust device using the centrifugal force shown in FIG. 5.

Hereinafter, an embodiment used as a supercharged exhaust device of a two-stroke diesel engine according to the present invention will be described.

Basically, the turbocharger shown in FIG. 1 is a continuous given turbocharger 1 which is provided for the supercharging of the exhaust air which is operated by the exhaust gas of a two-stroke diesel engine and supplied to a cylinder (not shown), and An intermediate cooler (2) for lowering the temperature of the air and one provided for passing the exhaust air from the supercharger (1) during operation and reducing the load on the engine to supply the engine with additional exhaust air and exhaust air pressure, or It consists of a receiver (3) connecting the intermediate cooler (2) to the blower (4) using more centrifugal force, and an exhaust air container (5) arranged to contain an appropriate amount of pressurized exhaust air and connected to the engine cylinder. .

FIG. 2 is a partial side view of the turbocharger shown in FIG. 1. FIG. As shown, the apparatus consists of two receivers 3 each connected to a blower 4 using two centrifugal forces, and the blower 4 using two centrifugal forces is in turn connected to the exhaust air container 5.

The first embodiment of the turbocharger of FIGS. 1 and 2 is schematically illustrated in FIG. 3, with corresponding parts being shown with the same reference numerals.

As shown, two additional blowers are provided which supply exhaust air to the engine independently of one another. This ensures that even if one of the devices does not operate in a larger or smaller range, the other can maintain the engine's operation, resulting in high reliability operation.

During operation, the supercharging exhaust device 1 generates the supercharged exhaust air supplied to the intermediate cooler 2 via the air pipe 6. Two air pipes 6 are connected to the air branch pipes 7, which allow the system to run even if one of the added blowers becomes inoperative. An air branch 7 may optionally be located behind the intermediate cooler 2 in which exhaust air is cooled.

The inlet 9 of the blower 4 using centrifugal force is connected to the outlet 10 of the intermediate cooler 2 via two different air pipes 8. For example, the valve 11 inserted into each of the two air pipes 8, which are the butterfly valves 11, preferably blocks the exhaust air from recirculating at each part of the blower when the blower stops operating. .

The boost air cooled by passing through the intermediate cooler 2 flows into the blower using centrifugal force via the two air pipes 8, and then the boost air flows out of the blower using the centrifugal force to the outlet of the blower which is rotating violently.

Exhaust air via two additional air lines 13 is finally filled with an appropriate amount of supercharged and cooled exhaust air supplied to a cylinder (not shown) of a two-stroke diesel engine during start-up or operation. 5) flows into.

The supercharged exhaust air having a natural humidity passing through the supercharger 1 is at least partially condensed through the passage of the exhaust air through the intermediate cooler.

However, if the condensate reaches the cylinder of the engine, it will inevitably damage the sleeve and the piston ring.

Therefore, according to the present invention, the condensed water is removed while the exhaust air passes through each of the centrifugal blowers via the drain cell 24 and the removed condensate is discharged from the drain cell 24 through the water pipe 16a. . This important function will be described later in detail.

4 is a schematic diagram of an alternative embodiment of the supercharger of FIG. 3. Corresponding parts are shown with the same reference numerals.

In this case, however, a separate water separator 14 is inserted in each of the two different tubes 8. The separator is designed as a centrifugal zone as already known. While the supercharged and cooled exhaust air passes through this zone, the condensate content in the air will be affected by the centrifugal force that throws the condensate into the curved wall of the centrifuge zone, which is the second drain placed below the centrifuge zone. It is collected in the compartment 15. Collected condensate flows out of the water separator 14 via the second water pipe 16b in the drainage basin.

The individual water separators 14 shown in FIG. 4 increase the certainty of removing condensate from the supercharged cooled exhaust air produced by the supercharger.

However, the main effects according to the present invention are obtained by the blower 4 using centrifugal force in the first embodiment of FIG. 3 and the second embodiment of FIG. 4. It will be described in detail in FIGS. 5 and 6 to be referred to later.

FIG. 5 is a longitudinal sectional view of the blower 4 using the centrifugal force whose main configuration is a blower housing 17 having a fan wheel 18 in the form of a shaft 19 having a plurality of blades 20 having a curved back surface. During operation, the fan wheel rotates in the direction shown by the arrow.

The fan wheel has an inlet 9 and an outlet 12. The air entering the inlet 9 is rapidly rotated while being guided to the outlet 12 of the blower housing by a curved wall 23 which can be formed spirally with the rotation of the fan wheel 18.

In this case, the blower using the centrifugal force has a horizontal axis of rotation. The drain cell 24 is arranged at the bottom of the housing and in the upper region of the cell the through plate 25 is laid at a relatively short distance from the curved wall 23. The plate, in which a number of through holes 26 are designed, faces upward or extends towards the outlet 12 of the blower housing.

The through plate 25 and the curved wall 23 of the blower housing form a drainage channel 27. The mesh 28 is inserted into the channel as shown in the enlarged partial cutaway view of the channel shown in FIG. 6.

The drain cell 24 is divided into a first zone 31 and a second zone 30 by a partition 29. The first zone 30 is connected to the inside of the blower housing 17 via a gap 32 facing the dominant flow direction in the blower housing, and the partition plate 33 is located at a short distance from the gap 32. . The drain channel 27 is open to the inside of the second zone 31.

As indicated by the arrows, the first outlet 34 and the second outlet 35 guide the condensed water collected outside the compartment in the two zones 31, 32 of the drain compartment 24, respectively.

As such, the supercharger is operated by a blower at normal or full load and a blower using centrifugal force connected to an electric motor (not shown in FIG. 5) or similar motor which is installed to operate the blower at a pre-reduced main engine load. Is designed to pass through.

Optionally, each centrifugal blower may be connected to the motor as coupling means for each connection and disconnection.

This structure leads to the fact that at pre-set loads, centrifugal blowers can be operated as additional blowers actively to provide additional exhaust air and exhaust pressure to the engine. On the other hand, the fan wheel is passively rotated by the exhaust air generated by the supercharger at high load.

As such, the blower wheels always rotate at an exemplary rotational speed of at least 500 rpm during operation, effectively throwing droplets of exhaust air into contact with the curved walls 23 and 25 of the blower housing 17 as shown in FIG. 5. .

The droplets 36 strike the curved walls 23 and 25 at a rate that will reach the outlet of the blower housing, and are further thrown in the same direction as the movement of the exhaust air through the blower.

In the meantime, a part of the condensate flows along the curved walls 23 and 25 of the blower housing 17 in the direction of the outlet of the blower housing and is guided into the first zone 30 of the drain cell 24 through the gap 32. Then, it is led downward by the partition plate 33 to leave the blower through the first outlet 34 of the drainage bin.

Condensed water that is not collected by the first compartment of the drain box flows continuously toward the outlet of the blower housing and reaches the through plate 25. In the meantime, the condensed water is introduced into the drainage channel 27 through the through hole 26 of the through plate under the centrifugal force and the exhaust air force, and the drainage channel 27 is located in the second zone 31 disposed under the drainage compartment. Guide the condensate collected below, and the collected condensate is removed through the second outlet 35 in the drain.

The second drain channel 37 is located at the very end of the curved wall 23 of the blower housing to collect the condensate flowing down the wall at this point. Collected condensate flows down the side walls of the blower housing in curved walls 23 and 25 of the housing and drains out of the blower housing in the manner indicated above.

A more particular construction of the supercharger of FIG. 4 is shown in the middle compartment 3 of FIG. 1 which acts as a centrifugal zone connected to a water separator 14 having an outlet 16b. In addition, two outlets 34 and 35 of the blower using centrifugal force are shown.

The present invention provides a turbocharger having a simple and inexpensive structure, and provides a turbocharger installed mainly by adopting an engine component forming part of the turbocharger, and a diesel engine, that is, a two-stroke diesel engine. It is possible to obtain the effect of removing condensed water in a more effective way than is known so far from the supercharged and cooled exhaust air supplied to the furnace.

Claims (10)

At least one supercharger 1 operated by the exhaust gas of the engine for supplying the charged exhaust air to the engine and at least one downstream of the at least one supercharger 1 for reducing the temperature of the exhaust air An intermediate cooler (2) and at least one auxiliary blower (4) designed as a centrifugal blower for supplying additional exhaust air and exhaust air pressure to the engine when the load of the running engine is reduced to a predetermined value, Inlet 9 of the blower 4 using centrifugal force is connected to the outlet of at least one intermediate cooler 2 and the outlet of the blower is connected to the exhaust air container of the engine. . The at least one open inlet (32) for guiding condensate separated from the cooled exhaust air passing through the blower (4) using a centrifugal force and at least one for guiding the condensate collected outside the sump. A supercharged exhaust device for a diesel engine, characterized in that a drainage bin (24) having one outlet (34, 35) is designed in the lower region of the blower housing (17) of the blower using at least one centrifugal force. 3. The turbocharger according to claim 2, wherein the fan wheel (18) of the blower (4) using at least one centrifugal force has a mainly horizontal axis of rotation. 4. The flow direction according to claim 2 or 3, wherein at least one open inlet (32) for guiding condensate to the drain (24) of the blower using at least one centrifugal force is the prevailing flow direction in the blower (4) using centrifugal force. And a through hole (32) of at least one gap shape directed toward the diesel engine. 5. The through plate 25 extends upwardly from the drain cell 24 of the blower 4 using centrifugal force toward or toward the outlet 12, according to claim 2, 3 or 4. It is installed at a distance from the curved outer wall 23 of the blower (4) using at least one centrifugal force along the area, the through plate (25) with the outer wall 23 to the drain channel (24) open to the drain (24) 27) supercharge exhaust device for the diesel engine, characterized in that to form. 6. The supercharge exhaust system according to claim 5, characterized in that the drain channel (27) is designed to have at least one flow resistance (28). 7. The supercharged exhaust apparatus according to claim 6, characterized in that the flow resistance of the drain channel (27) consists of a mesh (28) inserted in the drain channel. 8. The exhaust cell 24 according to claim 5, 6 or 7, wherein a compartment 29 is inserted into the exhaust compartment 24 so that the exhaust compartment 24 has at least one flow directed in the direction of the opening 32 in the form of a gap. The branches are divided into a first zone 30 and a drain compartment 24 into a second zone 31 having an outlet of the drainage channel 27, each of the two zones 30 and 31 guides the collected condensate in each zone. And at least one outlet (34, 35) for the diesel engine. The diesel engine according to claim 1, wherein a separate water separator is inserted between the inlet 9 of the blower 4 using the at least one centrifugal force and the outlet 12 of the at least one intermediate cooler. Supercharger. The blower (4) according to any one of the preceding claims, wherein the blower (4) using at least one centrifugal force is installed to rotate the blower using the centrifugal force at a predetermined reduction in engine load and to rotate by the blower using the centrifugal force at a smaller preset reduction. Supercharger for the diesel engine, characterized in that connected to the motor.