JPH032480Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an improvement of a support ring for a stern tube seal that supports a lubricating oil sealing ring of a stern tube seal. The purpose is to maintain a stable shaft sealing effect over a long period of time by preventing deterioration and wear caused by sliding heat.

[Conventional technology]

Conventionally, as shown in FIG. 1, a lubricating oil seal ring 1 of a stern tube seal has a support ring 4 supported on the stern casing side (not shown).
The base of the outer diameter is held between the adapter ring 2 fastened and fixed to the support ring 4, and the lip of the inner diameter is in airtight sliding contact with the outer periphery of the rotating shaft 5, thereby filling the oil chamber in the front of the lip. This prevents the lubricating oil 6 from leaking along the circumference of the shaft to the seawater side.

[The problem that the idea aims to solve]

However, according to the above conventional configuration, the lubricating oil 6 only flows in the rotational direction as the shaft rotates, and is hardly circulated. The generated heat is not dissipated and accumulates near the lip,
There was a problem in that early deterioration and wear of the lip portion due to heat resulted in a decrease in sealing performance in a short period of time. Further, when the rotating shaft 5 is eccentric, the seal ring 1 is forced to receive an uneven load, which is a cause of accelerated wear and deterioration of the seal ring 1.

Therefore, the present invention attempts to solve these problems by improving the support ring that supports the lubricating oil seal ring.

[Means to solve the problem]

That is, the support ring for a stern tube seal according to the present invention has an extended inner edge that is located near the front surface of the lip of the seal ring for lubricating oil and is slidably fitted with a bearing around the outer periphery of the rotating shaft. , a plurality of inclined channels whose inclination directions are alternately opposite to the axial direction are formed on the inner circumferential surface of the inner edge at equal intervals in the circumferential direction,
The structure is such that it is fitted and held in an airtight manner and slidable in the radial direction to the casing.

[Function] According to the above configuration, the lubricating oil that rotates due to contact with the outer periphery of the rotating shaft is pumped through the lubricating oil seal by the pumping action of the inclined channels formed on the inner edge of the support ring and inclined in opposite directions. Since a flow toward the front surface of the lip portion of the ring and a flow away from the front surface of the lip portion are simultaneously generated, lubrication and heat removal between the lip portion and the rotating shaft are actively performed. Also,
This support ring is slidably fitted with a bearing on the outer periphery of the rotating shaft at the inner edge, and is also fitted and held in a radially slidable manner with respect to the casing, so it is secure against eccentricity of the rotating shaft. The lubricating oil seal ring supported on the support ring also follows the support ring. Therefore,
The seal ring does not receive any eccentric load due to eccentricity of the rotating shaft.

〔Example〕

Hereinafter, the present invention will be explained with reference to an illustrated embodiment.

The stern tube seal shown in FIG. 2 includes a seal ring 1 for lubricating oil, a seal ring 11 for seawater, and a segment seal 10 located between the seal rings 1 and 11.

7, 8, and 9 are casings, 12 is an adapter ring, and 13 is an after cover on the stern side, which are sequentially connected and fixed in an airtight manner in the axial direction so as to surround the outer periphery of the rotating shaft 5, and the segment seal 10
is held in a non-rotating state within an annular chamber formed by the inner peripheral surface of the casing 9, the casing 8 on both sides thereof, and the adapter ring 12,
The inner peripheral surface is in airtight sliding contact with the outer periphery of the rotating shaft 5, and the mutually facing end surfaces are in airtight contact with the end surfaces of the casing 8 and the adapter ring 12. The seawater seal ring 11 made of synthetic rubber is held between the adapter ring 12 and the after cover 13 at its outer diameter base 11a, and is in airtight sliding contact with the outer periphery of the rotating shaft 5 at its inner diameter lip 11b. This prevents seawater from outside the ship from entering the ship from around the shaft.

The support ring 4 of the present invention, together with the adapter ring 2 fastened and fixed to the support ring 4,
There is an O
The garter spring 15 is fitted and housed so as to be slidable in the radial direction while being airtightly maintained by a ring, and the garter spring 15 is in airtight sliding contact with the outer periphery of the rotating shaft 5 at the inner lip portion 1b fitted therein. Then,
Lubricating oil seal ring 1 made of synthetic rubber that prevents the lubricating oil inside the ship from leaking from the shaft circumference to the outside of the ship.
is held between the inner diameter 4a of the support ring 4 and the fitting stepped portion 3 of the adapter ring 2 at its outer diameter base 1a.

The support ring 4 has an extended inner edge 4b that is located near the front surface of the lip portion 1b of the lubricant seal ring 1 and is slidably fitted with a bearing on the outer periphery of the rotating shaft 5. An annular oil chamber 16 is formed between the lip portion 1b and a knock pin 14 protruding from the support ring 4 in the axial direction.
is engaged with an elongated hole 7a provided in the casing 7 so as to be slidable in the radial direction to prevent rotation.

Inner peripheral surface 4c of the inner edge 4b of the support ring 4
As shown in FIGS. 4 and 5, a plurality of inclined channels 17, 17, . Furthermore, a plurality of communication holes 18 are formed extending radially from the oil chamber 16.

In the above configuration, the lubricating oil seal ring 1
The space on the front side (inside the ship) is filled with lubricating oil, and this lubricating oil passes through the inclined flow path 17 to the oil chamber 1.
6, and also the chamber 19 on the outer peripheral side of the support ring 4 and adapter ring 2 via the communication hole 18. When the rotating shaft 5 rotates in this state, the lubricating oil in contact with the shaft periphery rotates due to its viscosity. Due to the pump action, a flow moves from the inside of the inner edge 4b to the oil chamber 16 toward the front surface of the lip portion 1b of the seal ring 1 for lubricating oil, and a flow is discharged from the oil chamber 16 to the inside of the inner edge 4b. Since the flow is generated at the same time, lubrication and heat removal between the lip portion 1b and the rotating shaft 5 are actively performed.

Further, the support ring 4 is slidably fitted with a bearing on the outer periphery of the rotating shaft 5 on the inner circumferential surface 4c of the inner edge 4b, and is movable in the radial direction with respect to the casing 7. It is possible to follow the eccentricity, and the adapter ring 2 and the lubricating oil seal ring 1 also follow the support ring 4 integrally. Therefore, even if the rotating shaft 5 is eccentric with respect to the casing 7, the lubricating oil seal ring 1
is always maintained concentrically with respect to the rotation axis 5,
It does not receive unbalanced loads.

[Effect of idea]

As described above, according to the present invention, lubricating oil is supplied to the lip portion of the seal ring for lubricating oil by the pump action of the inclined channels provided on the inner edge of the support ring and inclined in opposite directions with respect to the axial direction. The channels and discharge channels are formed alternately in the circumferential direction, which actively lubricates and removes heat between the lip part and the rotating shaft, which not only prevents deterioration and early wear of the lip part due to sliding heat. This support ring is slidably fitted into a bearing on the outer periphery of the rotating shaft, and is also slidable in the radial direction relative to the casing, so that the lubricating oil seal ring reliably follows the eccentricity of the rotating shaft. Therefore, the seal ring for lubricating oil is always held concentrically with respect to the rotating shaft, and has the excellent effect of preventing premature wear or uneven wear caused by uneven loads due to eccentricity of the rotating shaft.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view of a stern tube seal with a conventional support ring, Figure 2 is a half-cut sectional view of a stern tube seal using the support ring of the present invention, Figure 3 is a sectional view of the same main part, and Figure 4 is a partial sectional view of a stern tube seal with a conventional support ring. The figure is a front view of the support ring, and FIG. 5 is a view taken along the line B in FIG. 4. 1... Seal ring for lubricating oil, 1a... Base, 1b... Lip part, 4... Support ring,
4b...inner edge, 5...rotating shaft, 7...casing, 17...inclined flow path.

Claims (1)

[Scope of utility model registration request] A support ring that non-rotatably supports the base of a lubricating oil seal ring on the stern tube casing side in a stern tube seal that provides a shaft seal between the stern casing and the rotating shaft, the support ring being near the front surface of the lip of the seal ring. An inner edge that is slidably fitted to the outer periphery of the rotating shaft is extended, and a plurality of inclined flows are provided on the inner circumferential surface of the inner edge, the directions of inclination of which are alternately opposite to the axial direction. A support ring for a stern tube seal, characterized in that channels are formed at equal intervals in the circumferential direction, and are fitted and held in an airtight manner and slidably in the radial direction with respect to the casing.