JPS6018664A - Separate type seal ring - Google Patents

Abstract

PURPOSE:To reduce the amount of oil consumption of a shaft sealing device by installing a coil ring on the outer circumference of each segment of a seal ring which is constituted with a wedge-shaped internal part having a sloped face and other part having a horizontal face thereon. CONSTITUTION:Each segment of a seal ring 13 is formed in such a way that said segment has a face sloping toward a piston rod, a wedge-shaped internal part 14 the top of which is oriented upward and other part which has a horizontal face thereon, and an oil window 15. Said seal ring 13 is constituted with more than 3 segments. System oil attached to said piston rod is scraped down to the wedge-shaped top of each segment of said seal ring 13 with a oil-scraping ring 11, and thereafter said oil passes down through an oil path 12 via said oil window 15 to be returned into an oil pan.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an improvement in a seal ring of a shaft sealing device for a piston rod used in a crosshead type Deepil 8N flywheel or the like.

(2) In the blue t1 double-acting internal combustion engine of the invention, power is obtained by burning the combustion angle in the cylinder and transmitting the resulting energy to the main crankshaft. It is. This transmission system includes a 1-rank type in which the piston and connecting rod are directly connected to the crank shirt 1, and a cross-head type, in which the piston 1 is connected to the piston rod 2, as shown in Figure 1. Take it.''
(), whose end and connecting rod 3 are connected via a crosshead 4, and the reciprocating motion of the piston rod 2 is converted into rotational motion;
There is also a method that transmits power. The latter type has a relatively simple structure, good combustion efficiency, and has many advantages such as long strokes and increased protrusion, so this type is used in almost all large marine engines.

However, in such a large diesel engine, since the inferior type +b is used as fuel, the cylinder oil used as a lubricating oil becomes contaminated by combustion gas and combustion residue, and this contaminated cylinder oil flows into the crankcase 5. In order to prevent 12 people from staying inside, a partition plate 6 is installed between the combustion chamber side and the taran close side, and a stuff box is installed around the piston rod 2 directly above the lever. A shaft seal called M7 is attached.

As shown in Fig. 2, the stanning box is composed of a split-type main body outer shell (packing booth) 71 and a split-type internal packing.The internal packing is used for gas sealing. It consists of an airtight ring 10 and an oil scraping ring 11 for scraping off excess system oil adhering to the piston rod 2 to maintain a proper amount of lubricating oil film.
Multiple pieces of each are installed. In addition, a communication hole 17 is provided at the back of the uppermost oil scraper ring, and lubricating oil contaminated by combustion residue that has entered from the upper part and lubricating oil that cannot be scraped off by the oil scraper ring 11 can be removed. Mixed oil of system oil is discharged 141 to the outside through this communication hole 17.

However, even with the conventional shaft sealing device having the above-mentioned structure, the current situation is that it does not provide a sufficiently satisfactory system oil scraping action for the reasons described below. That is, in FIG. 3, the oil that has arrived at the piston (9) is at the bottom tf of the oil scraper ring 11, as shown by the solid arrow C.
Ja to J: Although it is scraped off and discharged to the oil relief hole 12, some of the oil that falls onto the top tooth of the oil scraping ring 11 and remains is returned to the piston as shown by the dotted arrow. Since it adheres to the rod surface and circulates, the overall oil scraping performance deteriorates, resulting in an increase in system oil consumption (m).

(3) Purpose of the Invention In view of the above, the present invention aims to improve the discharge of scraped oil in a shaft sealing device for a piston used in a diesel engine, etc. The purpose of this is to improve the oil scraping performance of the entire shaft sealing device and to reduce the system oil consumption a1.

(4) Structure and Examples of the Invention The structure of the present invention is a split type seal that scrapes oil from the piston rod by being attached to the inner peripheral groove of the outer shell of the shaft sealing device main body of the piston rod, that is, the outer periphery of the piston rod. The ring has a wedge-shaped inner part with an inclined surface that slopes toward the piston rod (111), and a flat part on the L surface of the part other than the inner part, and a coil ring is arranged around the outer periphery of the wedge-shaped In particular, the wedge-shaped tip faces upward, and the flat part is connected to the outer shell of the shaft sealing device body opposite to the flat part. It is characterized by having oily shine on the sea urchin.

An example will be described based on the drawings. FIG. 4 shows a stuff box in which the seal ring of the present invention is applied. 2 is a piston rod, and among the plurality of inner circumferential grooves of the box body 71 inserted into the piston rod, the upper two have airtight rings 10 for gas sealing, and the lower three have conventional oil scraping rings 11. Then, the seal ring 13, which is a feature of the present invention, is installed. All three are split types and are held together by a coil spring. In addition, there is a t, i,
A communication hole 17 is provided, and a mixed oil of lubricating oil and system oil contaminated by combustion residue that has entered from the upper part is discharged to the outside through this communication hole 17.

In the case of Fig. 4, the shape of the seal ring 13 is a wedge-shaped inner part with an inclined surface sloping toward the screw rod, and a wedge-shaped inner part with the tip facing upward, and a flat upper part of the part other than the inner part. It is something that has a lot of light on it.

Figure 5 is a plan view of the seal ring, and Figure 6 is a Δ-A vertical cross-sectional view of each, but like the airtight ring and oil scraper ring, this seal ring is also divided into 3-) or more parts. Segment type. In this case, the oil light 15 is attached to the seal ring (yl tt), but the shaft sealing device main body outer shell 7
It is also possible to attach it to one side.

In FIG. 4, the system oil on the piston rod 2 is scraped off by the oil scraper ring 11 to the extent of 1/l (see FIG. 5.6) of the wedge-shaped tip of the reseal ring 13. The oil passes through the shaft 15, descends through the C oil relief hole 12, and is returned into the oil pan. In this way, the scraped oil is discharged into the oil release hole 12 without falling onto the oil scraping ring located below.

In addition, the seal ring of the present invention has a wedge-shaped tip facing downward, unlike conventional oil scraping rings (without using Jf, the seal ring is installed alone, and the oil is directly directed downwards by 1ffi).
Drop it like J, or put the wedge shape one below [)゛■
-It may be in the shape of a letter. Furthermore, the seal ring of the present invention may be used in combination with an oil scraper ring,
It is also possible to install it independently between the oil scraper rings.

This is an example in which the sealing device of the present invention is used as a stuffing box for a gearbox in a cross rad turbine. It can be used as a box to prevent cold 7.11 water from entering the cylinder, and can also be applied to other devices where it is necessary to seal the piston rod.

(5) Effects of the Invention As described in detail above, the shaft-lug device of the present invention has a double M-type structure consisting of an oil scraper ring and a seal ring (which removes the wedge-shaped portion).
'r 3i 2i J: 1st floor of the engine's system oil tank
This makes it possible to effectively remove fl from the system, thereby reducing the amount of system oil consumed.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional view of the main part of a crosshead type deep pill engine, Figure 2 is a partial cross-sectional view of a conventional stano cylinder box, Figure 3 is an enlarged view of the main part of Figure 2, and Figure 4 is a partial cross-sectional view of the main part of a crosshead type deep pill engine. FIG. 5 is a plan view of a seal ring, and FIG. 6 is an enlarged cross-sectional view taken along Δ-8 in FIG. 5. 7... Stuffing box, 71... Box body, 10... Airtight ring, 11... Oil scraper ring,
12... Oil relief hole, 13... Seal ring, 14...
... Wedge-shaped portion, 15... Oil shine, 17... Communicating pores W1 Applicant: Nippon Piston Ring Co., Ltd. Figure 1 Figure 2

Claims (2)

[Claims] (1) A split type seal ring that scrapes oil from the piston rod by being attached to the inner periphery of the outer shell of the shaft sealing device main body of the piston rod, that is, the outer periphery of the piston rod,
A division characterized by having a wedge-shaped inner part having an inclined surface that slopes toward the piston rod, a flat part on the upper surface of the part other than the inner part, and a coil ring arranged around the outer periphery of the wedge-shaped inner part. mold seal ring. (2) Claims characterized in that the wedge-shaped tip faces upward and has an oil window attached to the upper surface of the flat part or to the outer shell of the device main body opposite to the flat part. The split seal ring described in item 1.