KR100506468B1 - Two stroke large diesel engines - Google Patents

Abstract

The present invention relates to an engine, such as a two-stroke large diesel engine, comprising two parts (1, 7) assembled together. A cooling channel 12 into which coolant can be introduced, a sealing device for closing the cooling channel and being offset in the axial direction, and a support surface 9, 10 for absorbing counter supporting forces. ) Is provided in the junction region between the parts 1 and 7 assembled together. Indication boreholes 19 extending to the outer surface are provided on the support surface to indicate whether there is leakage. The engine according to the present invention is characterized by reliably preventing leakage of coolant or leakage of combustion gas. For this purpose, the sealing device provided in the cooling channel consists of a circular flat sealing ring 17 located between the support surfaces 9, 10. A circular channel system 18 is provided in the flat sealing ring which connects the upper and lower surfaces of the flat sealing ring located on the support surface side, and the indicating hole 19 is in communication with the channel system.

Description

Two-stroke large diesel engine {TWO STROKE LARGE DIESEL ENGINES}

The present invention relates to a two-stroke large diesel engine having at least one cylinder having an exhaust opening that is adjustable through an exhaust valve, in particular an engine having two parts assembled together. The cylinder has a cylinder head and is provided with a seat part coupled to the exhaust valve and including a exhaust opening. Absorbs cooling channels into which coolant can be introduced, sealing devices for closing and axially offset cooling channels, and counter supporting forces, in the junction region between the parts assembled together. A support surface is provided. Indication boreholes extending to the outer surface are provided in the support surface to indicate whether there is leakage.

Cylinders of the same well-known two-stroke large diesel engine each have an exhaust opening provided in the cylinder head, and the exhaust opening can be opened and closed by the provided exhaust valve. In the case of this two-stroke diesel engine, a seat portion is provided in the cylinder head that includes a valve seat that cooperates with the exhaust valve and has an exhaust opening. The seat portion is supported on the support surface provided in the cylinder head together with the horizontal support surface. The sheet region of the sheet portion is cooled. To this end, a circular cooling channel is provided in which coolant can be introduced in the junction region between the seat portion and the cylinder head. Sealing rings inserted into the circular grooves of the seat portion and formed like so-called O-rings are provided on the upper and lower cooling channels to seal the cooling channels. However, because the temperature-load is very large, in particular the lower O-ring close to the combustion chamber may be damaged and poorly sealed. As a result, the coolant can reach the combustion chamber, which is very undesirable and can quickly close the running face of the cylinder liner. Here too, there is a risk that hot combustion gases can leak into the cooling channel and the cooling effect is lost. This risk is particularly prominent when the sheet surfaces are not in exact contact with each other, due to impurity particles reaching between the sheet surfaces, such as coal particles.

Indication holes indicate homogeneous leaks. The same kind of indication, however, is at risk of appearing after the aforementioned demolition. Apart from this, the coolant coming out of the indicator hole not only leads to cooling water loss but also wets the engine room, which is likewise undesirable.

1 is a cross-sectional view of a cylinder head of a two-stroke large diesel engine cylinder;

2 is a plan view of a flat sealing ring according to the present invention.

3 is a cross-sectional view of the flat sealing ring according to FIG. 2.

4 is a cross-sectional view of another embodiment of a flat sealing ring.

5 is a cross-sectional view of another embodiment.

An object of the present invention is to start from this and to improve the above-mentioned device in a simple and low cost to achieve a high driving stability.

An object of the present invention includes a circular flat sealing ring in which a sealing device disposed in a cooling channel is positioned between a supporting surface, wherein the flat sealing ring has a flat sealing ring positioned at a supporting surface side. A circular channel system is provided which connects the upper and lower surfaces to each other, and is achieved by the directing hole communicating with the channel system.

This measure completely avoids the disadvantages of the existing devices mentioned above. The flat sealing ring inserted between the supporting surfaces ensures high stability against leakage. The flat sealing ring here can be formed in such a way that impurity particles, such as coal particles, are completely embedded, so that no gaps are formed in any case. Likewise, materials with relatively high temperature resistance can be used to form flat sealing rings. This can increase the driving temperature, which advantageously works for the efficiency to be achieved. Preferably it is sufficient that the sealing device provided in the flat sealing ring comprises only the flat sealing ring. No other sealing means is necessary here.

Forms advantageously formed and improved for the purpose are presented in the dependent claims. In the case of the two-stroke large diesel engine mentioned above, a flat sealing ring located between the support surfaces is provided in the combustion chamber side lower sealing device of the cooling channel suitably for the purpose, and preferably can form the lower sealing device. This is because the lower seal is exposed to severe temperature loads than the upper seal away from it. The upper seal can simply be formed as an O-ring.

Another preferred solution is that the flat sealing ring is formed as a metal ring. This allows the above mentioned properties to be realized in the simplest way. In this case, in order to form a flat sealing ring, it is preferable to use a copper alloy or a relatively soft steel alloy. It can be seen in this way that under the action of the driving force the flat sealing ring can be elastically and slightly plastically deformed. This ensures reliable tightness even when not flat.

In another embodiment of the above schemes, the flat sealing ring may have a plurality of valve-opening slots separated from one another via a web to form a channel system. The valve opening slot is a relatively large cross section communicating with the pointing hole between the upper and lower flat sealing rings. This gives a quick indication if there is a leak.

Another preferred form is the provision of circular grooves on both sides of the flat sealing ring to form the channel system. The circular grooves are communicated with each other by connection-recesses penetrating the bottom of the cavity groove. Since the manufacture of the circular groove is relatively simple, the production cost is also relatively low. In addition, the groove bottom of the cavity ensures reliable stability in the radial direction.

Circular grooves on the support surface side are provided in the seat portion and the cylinder head to form a channel system, thereby obtaining a particularly stable flat sealing ring. The circular grooves are then communicated with each other by the holes of the flat sealing ring.

Other forms of advantageously forming and preferably improving the solutions are set forth in the remaining dependent claims, and can be more fully understood from the following examples based on the figures.

The drawings described below are as follows.

The invention is mainly applied to the cylinder head of a two-stroke large diesel engine. The cylinder here has an exhaust opening provided in the cylinder head area and adjustable by the respective exhaust valve. In the case of homogeneous engines, the basic structure and mode of operation are well known, and thus no detailed explanation is required in this regard.

The cylinder head 1 of the two-stroke large diesel engine shown in FIG. 1 is mounted on a cylinder liner (not shown in detail). The cylinder head 1 has a central exhaust opening 2 having a relatively large diameter, and the exhaust channel 3 communicates with the exhaust opening 2. The exhaust opening 2 can be opened and closed by an exhaust valve 4 arranged opposite the cylinder chamber 5. The valve disk of the exhaust valve 4 has a truncated cone bearing surface 6, the conical seat surface 8 provided at the contact surface being located in the cylinder head 1, and It is formed in the seat portion 7 which is penetrated by the exhaust channel 3.

The cylinder head 1 and the seat portion 7 located on the cylinder head are joined by an anchor (not shown in detail) and have horizontal support surfaces 9 and 10 joined to each other to transfer the counter bearing force. Equipped. In order to form the support surfaces 9, 10, the cylinder head 1 has an upward step, and the seat portion 7 has a downward step. The mutual contact surfaces 6, 8 of the exhaust valve 4 and the seat portion 7 are exposed to high mechanical and thermal loads. Therefore, the contact surface may be provided with an armor-plating 11 made of a special material. The seat 7 is cooled at the same time by using a coolant.

In addition, a circular cooling channel 12 is located in the region of the cylindrical joint located above the support surfaces 9, 10 and connecting between the cylinder head 1 and the seat portion 7. The cooling channel 12 is formed by circular holes facing each other in the circumference of the cylinder head 1 and the circumference of the seat 7. The cooling channel 12 can supply circulating coolant, usually cooling water, through intake and exhaust conduits, as seen on the left side of FIG. Similarly, the piercing bores 14 shown on the left side of FIG. 1 branch from the cooling channel 12 and reach the sheet region of the sheet portion 7.

The cooling channel 12 is sealed by the top and bottom sealing device in the axial direction. The upper seal away from the combustion chamber is formed of an O-ring 15. The O-ring 15 is inserted into a circular groove 16 recessed in the circumferential region outside the seat portion 7 and co-operates with the cylindrical inner circumference of the cylinder head 1. The illustrated embodiment has a circular flat seal ring 17 positioned between the support surfaces 9, 10 for forming a lower seal close to the combustion chamber, the flat seal ring 17 having a cross section that looks like a flat rectangular shape. Has The thickness of the flat sealing ring 17 is about 2 mm. It is, of course, possible to add other sealing means to the flat sealing ring 17 as in the aforementioned O-ring.

The flat sealing ring 17 disposed between the support surfaces 9 and 10 is preferably composed of a relatively soft steel alloy or a soft copper alloy. In this case, the base material of the cylinder head 1 or the seat 7 should be relatively soft metal. The metal must be strong enough to be elastic and slightly plastically deformable under the action of the forces present during operation. As a result, even when there are any surface roughness and / or impurity particles reached between the supporting surfaces, the upper and lower surfaces of the flat sealing ring 17 are hermetically contacted with the opposing supporting surfaces 9 or 10. It is possible to do

Although the flat sealing ring 17 is extremely reliable, an indication device can be provided to indicate whether it is leaking to increase stability. The indicator device includes a channel system 18 (in other words, the channel system 18 in the present specification, the leaked combustion gas or the like passes through the flat sealing ring 17 to detect whether there is a leak. Refers to a configuration that allows flow to (19), for example the configuration of the web 22 and the arc-shaped slot 23 formed in the flat sealing ring 17 in Figs. 2, 3, the flat sealing ring (Fig. 4) Configuration of the circular groove 25 and the hole 27 formed in the 17, the hole 29 formed in the circular sealing 28 and the flat sealing ring 17 formed in the cylinder head 1 and the seat portion 7 in FIG. ), The channel system 18 is provided in the flat sealing ring 17, and faces the upper and lower surfaces, and the upper and lower surfaces of the flat sealing ring 17, respectively. The upper and lower joints between the support surfaces 9 and 10 are connected to each other. An indication hole 19 (shown on the right in FIG. 1) extending to the outer side is connected to the channel system 18. It is preferable to have a plurality of indicating holes 19 evenly distributed over the circumference over the entire circumference.

The pointing hole 19 is arranged in the seat portion 7 and ends in the area outside the radius of the exhaust channel housing 20 mounted in the seat portion 7, that is, in the upper region of the seat portion 7. The exhaust channel housing 20 has a collar comprising the collar of the seat portion 7. Thus, a circular annulus 21 is seen in the entrance region of the pointing hole 19 which can be seen from the outside. The liquid or combustion gas discharged from the indicating hole 19 and entering the annulus 21 can thus be easily recognized by a little observation. The leaking liquid discharged may wet the parts of the engine and the combustion chamber surrounding the annulus 21. However, this case does not actually occur because the reliability of the flat sealing ring 17 is high.

For the embodiment shown in FIG. 2, the flat sealing ring 17 is a plurality of arc slots 23 separated from one another by a thin web 22 to form the channel system 18. ) May be provided. The arcuate slot 23 passes through the entire thickness of the flat sealing ring 17 according to FIG. 3 and thus communicates with each other the upper and lower surfaces of the flat sealing ring 17. The underlying embodiment of FIG. 2 has four arcuate slots 23 and four webs 22 provided in each quadrant. The inner width of the arcuate slot 23 is about 2 mm when the inner diameter of the flat sealing ring 17 is about 200 mm, reaching 1% of the inner diameter. The width of the web 22 is also 2 mm, which may be about 1% of the inner diameter.

The arcuate slot 23 is preferably located in a half region of the width of the flat sealing ring 17 inwardly as shown in FIG. 2. This forms a wide sealing surface 24 outside the radius. Since the arc-shaped slot 23 communicates between the upper and lower surfaces of the flat sealing ring 17, in any case, the leaking liquid or the leaking gas leads to the indicating hole 19 branching from the top of the flat sealing ring 17. This does not matter whether the leak is in the lower region or the upper region of the flat sealing ring 17.

In another embodiment, shown in FIG. 4, circular grooves 25 are provided on opposite sides of the flat sealing ring 17. The circular grooves are communicated with each other by holes 27 that dig into the cavity bottom 26 of the cavity. This embodiment achieves relatively high strength in the radial direction. It may also have a relatively wide sealing surface 24 outside the radius. The axial thickness of the flat sealing ring 17 is 2 mm, likewise reaching about 1% of the inner diameter. The radial thickness is 26 mm, less than 10% of the outer diameter.

In another embodiment, shown in FIG. 5, the cylinder head 1 and the seat portion 7 have circular grooves 28 separating the support surfaces 9, 10 arranged opposite to each other. The flat sealing ring 17 has a hole 29 penetrating the entire thickness, whereby a channel system 18 communicating with the upper and lower surfaces of the flat sealing ring 17 can also be formed and communicated with the pointing hole 19. .

The present invention relates to a two-stroke large diesel engine having at least one cylinder having an exhaust opening that is adjustable through an exhaust valve, in particular an engine having two parts assembled together.

Claims (13)

A two-stroke large diesel engine having two parts assembled to each other, comprising at least one cylinder having an exhaust opening 2 that is adjustable through an exhaust valve 4, the cylinder having a cylinder head 1, and A seat part 7 coupled to the exhaust valve 4 and including the exhaust opening 2 is provided to the cylinder head 1, and the cylinder head 1 as two parts assembled together; In the junction region between the seat portions 7, a cooling channel 12 into which coolant can be introduced, a sealing device for closing the cooling channel 12 and being offset in the axial direction, and mutual support force Are provided with a support surface 9, 10 which is arranged to indicate leakage of indication boreholes 19 extending to the outer surface. In diesel engines, The sealing device provided in the cooling channel 12 includes a circular flat sealing ring 17 located between the support surfaces 9, 10, and the flat sealing ring 17 includes: A circular channel system 18 is provided which connects the upper and lower surfaces of the flat sealing ring 17 located on the support surface side with the pointing hole 19 communicating with the channel system 18. The flat sealing ring 17 being formed as a metal ring Two-stroke large diesel engine, characterized in that. In claim 1, The flat sealing ring 17 is a two-stroke large diesel engine, characterized in that made of a material that can be elastically and plastically deformed if there is an action of the driving force. delete The method of claim 1 or 2, The flat sealing ring 17 is a two-stroke large diesel engine, characterized in that made of copper alloy or light steel alloy. The method of claim 1 or 2, The flat sealing rings 17 are separated from each other by a web 22 to form the channel system 18 and a plurality of arc slots penetrating the height of the flat sealing ring 17. (2) A two-stroke large diesel engine comprising: The method of claim 1 or 2, The flat sealing ring 17 has circular grooves 25 on both sides to form the channel system 18, the grooves 25 connecting holes for digging into the groove bottom 26 of the cavity. A two-stroke large diesel engine characterized in that it is communicated with each other by a connection-recess (27). The method of claim 1 or 2, The cylinder head 1 and the seat portion 7 have a circular groove 28 toward the support surface to form a channel system, the groove 28 penetrating the height of the support ring 17. A two-stroke large diesel engine characterized by being in communication with each other by (29). The method of claim 1 or 2, The flat seal ring (17) is a two-stroke large diesel engine, characterized in that to form a sealing device provided alone. The method of claim 1 or 2, In the case of a two-stroke large diesel engine, the flat sealing ring 17 located between the support surfaces 9 and 10 is provided in the combustion chamber side lower sealing device of the cooling channel 12, and preferably the sealing device is Two-stroke large diesel engine, characterized in that forming. In claim 9, A two-stroke large diesel engine, characterized in that the sealing device remote from the combustion chamber of the cooling channel (12) is formed as a circular O-ring. The method of claim 1 or 2, In the case of a two-stroke large diesel engine, the seat portion (7) has a cooling hole (14) branching from the cooling channel (12) to the seat area. The method of claim 1 or 2, In the case of a two-stroke large diesel engine, the intake and exhaust conduits (13) provided in the cooling channel (12) are arranged in the cylinder head (1). The method of claim 1 or 2, In the case of a two-stroke large diesel engine, the indicating hole 19 is disposed in the seat portion 7 and ends in the upper region of the seat portion 7, and the upper region of the seat portion 7 is the seat portion ( 7-stroke large diesel engine, characterized in that it comprises a connection area provided in the exhaust channel housing 20 mounted in the radial direction.