JPH0747648Y2 - Oil sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an oil sealing device between a casing and a rotating shaft.

[Conventional technology]

Conventionally, mechanical seals including labyrinths have often been used in oil sealing devices for high-speed rotating shafts, but in order to form mechanical seals with excellent sealing effects, it is necessary to make the seal formation area relatively large. , Mechanical seals may be disadvantageous if the installation space is small. It has been devised to use a carbon ring having excellent sliding resistance when the mounting space is small. Further, Japanese Utility Model Laid-Open No. 61-147340 discloses the use of a piston ring-shaped shaft seal.

[Problems to be solved by the device]

A seal ring such as an elastic seal ring made of rubber or the like, a piston ring, a carbon ring or the like is arranged in an annular ring groove provided on the inner peripheral surface of the casing or the outer peripheral surface of the rotating shaft.
However, since the carbon ring is a solid and cannot be pushed into the annular groove like an elastic seal ring made of rubber or the like, in order to arrange it in the annular groove, a fitting hole such as a piston ring is provided so that it expands when inserted. It is necessary to keep it. However, since the carbon ring has no elasticity and is fragile when expanded like a piston ring, it cannot be used as a ring having one abutment like a piston ring. For this reason, it is formed as a two-part type consisting of a semi-circular half body, and after being arranged in an annular ring groove, it is pressed against the inner peripheral surface of the casing using a spring ring or the like to be integrated. There is. In this case, some gaps are included in the abutment formed between the ends of each half. Therefore, in the conventional oil sealing device using the carbon ring, there is a problem that oil leakage occurs from the gap of the joint. Further, there is a problem that a gap is generated between the outer peripheral surface of the carbon ring and the inner peripheral surface of the housing, and oil leakage occurs from the gap.

[Means for Solving the Problems]

The oil sealing device according to the present invention comprises a rotating shaft supported by a casing, a runner fixed to the rotating shaft, a solid seal ring arranged in an annular groove on an outer peripheral surface of the runner, and an inner peripheral surface of the casing. An elastic seal ring which is arranged in the annular groove of and engages with the outer peripheral surface of the solid seal ring,
The runner is formed of at least two annular members axially divided along a dividing surface including the annular groove, the solid seal ring is formed as an endless ring, and the solid seal ring is formed on the casing. It is characterized in that a rotation preventing means for preventing rotation with respect to it is provided.

[Action]

The runner is formed of at least two annular members, first of which at least one annular member is attached to the rotating shaft, and then a solid sealing ring formed as an endless ring is arranged along the first attached annular member. Then, the remaining annular member can be attached to the rotary shaft and fixed. Therefore, the solid seal ring can be disposed in the annular groove on the outer peripheral surface of the runner fixed to the rotating shaft without the abutment, and since there is no abutment, leakage from the abutment is eliminated unlike the conventional case. Further, the elastic seal ring arranged in the annular groove on the inner peripheral surface of the casing engages with the outer peripheral surface of the solid seal ring to elastically hold the solid seal ring with respect to the casing. Since the solid seal ring does not rotate with respect to the casing, the solid seal ring does not rotate relative to the elastic seal ring, wear of the elastic seal ring is prevented, and good durability is achieved. The sealing performance is maintained.

〔Example〕

 An embodiment of the present invention will be described below.

FIG. 1 is a sectional view showing an inlet side portion of a compressor of a gas turbine engine provided with an oil sealing device according to the present invention. The compressor of a gas turbine engine includes a compressor impeller 10, a compressor housing 12 arranged around the compressor impeller 10, and a rotary shaft 14 mounting the compressor impeller 10 so that air is drawn in the direction indicated by arrow A. It has become. The rotary shaft 14 extends on both sides of the compressor impeller 10, and a compressor turbine (not shown) of a gas turbine engine is attached to the right side portion of the rotary shaft 14 in FIG. The left side portion of the rotary shaft 14 is supported by the casing 18 via a bearing 16 (and another bearing not shown). A lubricating oil chamber 18a is formed in the casing 18, and lubricating oil is supplied to the bearing 16 from the oil supply hole 20 and returned to the oil pan from a discharge hole (not shown) at the lower end of the lubricating oil chamber 18a. Has become.

The outer shape of the casing 18 is formed in a conical shape corresponding to the shape of the inlet portion of the compressor housing 12, and its right end portion faces the end surface of the hub portion of the compressor impeller 10 and constitutes a part of the inlet passage for intake air. . There is a minute gap between the right end of the casing 18 and the end surface of the hub of the compressor impeller 10, and a static pressure (negative pressure) of the flow of intake air in the direction of arrow A acts on this minute gap. For this reason, oil splashes in the lubricating oil chamber 18a are
Will be sucked into 2. An oil sealing device is provided to prevent this oil flow.

Referring to FIGS. 1 and 2, the oil sealing device includes a solid carbon ring 22 and a rubber elastic seal ring 24, and the carbon ring 22 includes first and second annular runner members 26 and 28. It is arranged in an annular ring groove 30 provided on the outer peripheral portion of the runner. In the exemplary embodiment, the first annular runner member 26 has a stepped diameter and the second annular runner member 28 has a single diameter so that the first annular runner member 26 has a single diameter.
A small diameter part of the second annular runner member 28 is abutted,
Therefore, the outer peripheral surface of the small diameter portion of the first annular runner member 26 forms the bottom of the annular ring groove 30, and the first annular runner member 26
The side surfaces of the stepped portion and the second annular runner member 28 respectively form both side surfaces of the annular ring groove 30.

The compressor impeller 10 is brought into contact with the large-diameter portion of the rotary shaft 14, and is screwed to the left end side of the rotary shaft 14 via the first and second annular runner members 26 and 28, the bearing 16, the sleeve 17, etc. The first and second annular runner members 26, 2 are fastened by means of this fastening.
8 is fixed to the rotating shaft 14. Also, the elastic seal ring 24
Is arranged in an annular ring groove 32 provided on the inner peripheral surface of the casing 18.

The carbon ring 22 is formed as an endless ring, the outer diameter of which is slightly smaller than the diameter of the inner peripheral surface of the casing 18, and the inner diameter of which is slightly larger than the outer peripheral surface of the bottom of the annular ring groove 30. Further, the carbon ring 22 is axially movable within the annular ring groove 30. The elastic seal ring 24 projects inward from the inner peripheral surface of the casing 18 and engages with the carbon ring 22 to elastically hold the carbon ring 22. Therefore, it becomes possible to cope with a deviation at the time of assembling the parts and a displacement due to thermal expansion during operation.

Further, as shown in FIG. 2, a part of the annular ring groove 32 provided on the inner peripheral surface of the casing 18 is formed as a flat surface portion 32a, and correspondingly, one of the outer peripheral surface of the carbon ring 22 is formed. The portion is formed as a flat portion 22a. The plane portion 32a and the plane portion 22a face each other with the elastic seal ring 24 interposed therebetween, and prevent the carbon ring 22 from rotating with respect to the casing 18 and the elastic seal ring 24. by this,
The elastic seal ring 24 can perform the sealing action without wear. As a result, carbon ring 22
Does not have to worry about leakage to the inner peripheral surface of the casing 18, and can perform a leak-free sealing action while sliding on the side surface of the annular ring groove 30. At this time, the carbon ring 22 is axially movable in the annular ring groove 30, but the carbon ring 22 is moved toward the second annular runner member 28 by the static pressure (negative pressure) of the flow of the intake air in the direction of arrow A described above. And is stably slid on the side surface of the second annular runner member 28 while performing a leak-free sealing action. The flat surface portion 32a and the flat surface portion 22a can be provided at a plurality of positions,
Also, other configurations can be adopted as the detent.

In the above structure, when assembled, the second annular runner member 28 is first attached to the rotary shaft 14, the elastic seal ring 24 is arranged in the annular ring groove 32, and the carbon ring 22 formed as an endless ring is elastically sealed. Located adjacent the second annular runner member 28 while engaging the ring 24.
Then, the rotating shaft 14 is attached while inserting the small diameter portion of the first annular runner member 26 into the carbon ring 22, and the first and second annular runner members 26, 28 are fixed by the nuts described above. In this way, the carbon ring 22 can be arranged in the annular groove 30 on the outer peripheral surface of the runner members 26, 28 fixed to the rotating shaft 14 even if there is no abutment. The leak is gone.

[Effect of device]

As described above, according to the present invention, a solid seal ring formed as an endless ring is used, and the solid seal ring is formed from at least two axially divisible annular members. A rotation preventing means for preventing the solid seal ring from rotating with respect to the casing by engaging with the elastic seal ring arranged in the annular groove provided on the inner peripheral surface of the casing while being arranged in the annular groove provided on the casing. Since it is configured to be installed, the solid seal ring can be placed in the annular groove on the outer peripheral surface of the runner even if there is no abutment, and since there is no abutment, leakage from the abutment is prevented as in the past it can. Further, the elastic seal ring arranged in the annular groove of the inner peripheral surface of the casing engages with the outer peripheral surface of the solid seal ring, and the solid seal ring can be elastically held with respect to the casing. An excellent and compact sealing device can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a portion of an inlet side of a compressor of a gas turbine engine provided with an oil sealing device according to the present invention, and FIG. 2 is an enlarged sectional view taken along line II-II of FIG. 14 …… Rotary shaft, 16 …… Bearing, 18 …… Casing, 22 ……
Carbon ring, 24 …… Elastic seal ring, 26,28 ……
Annular runner member, 30, 32 ... Annular ring groove.

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft supported by a casing, a runner fixed to the rotary shaft, a solid seal ring arranged in an annular groove on the outer peripheral surface of the runner, and an annular groove on the inner peripheral surface of the casing. And an elastic seal ring that is engaged with the outer peripheral surface of the solid seal ring, the runner being formed from at least two annular members axially divided along a dividing surface including the annular groove. At the same time, the solid seal ring is formed as an endless ring, and rotation preventing means for preventing the solid seal ring from rotating with respect to the casing is provided.