JPS58221072A - Shaft seal device - Google Patents

Abstract

PURPOSE:To prevent a leak of fluid from a joint part, by providing a groove or a notch to form a partitioning plate fitting part, arranging a partitioning plate to the partitioning plate fitting part so as to contain the joint part of a seal ring and sealing the joint part. CONSTITUTION:A central part in the peripheral direction of a seal ring 16 is notched to be formed deeper than a depth in the radial direction of a joint 17 and an almost circular arc shaped groove 18 is formed as a partioning plate fitting part in oppositely facing end parts of both sides in the peripheral direction of the joint 17 of the seal ring 16. A circular arc shaped partitioning plate 19 is fitted to this groove. A circular arc of this plate 19 is formed equal to the circular arc of the seal ring 16, when the ring 16, in which the partitioning plate 19 is fitted to the groove 18, is forcibly attached to a retainer internal peripheral surface 5, the periphery of the plate 19 is aligned to the periphery of the groove 18 and not contacted with a rotary shaft 2. In this way, the seal ring 16 fitting the plate 19 to the groove 18 is fitted to an annular groove 3 to perform a shaft seal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a shaft seal device used for a rotating shaft or the like.

For example, a conventional shaft seal device of this type is shown in Fig. 1 (
As shown in 4) and (I3), there are some that use a seal ring. In the first FiJ (4), a piston ring type seal ring 1 having a spring force is fitted into an annular groove 3 formed on the axial circumference of the one-rotation shaft 2, and the seal ring 1
is pressed against the inner circumferential surface 5 of a bearing end (retainer) 4 of a bearing (not shown) that rotatably supports the rotating shaft 2 by its spring force.

When this shaft seal device is used in a rotating shaft system in which there is a pressure difference between the gaps 6 and 7 on both the left and right sides of the seal ring 1, for example, in a rotating shaft system such as a gas turbine, the shaft seal device shown in FIG. (
As shown in 4), since the seal ring 1 is held in a pressed state against the low pressure side wall surface 3A of the annular groove 3, fluid such as oil or gas leaks from the high pressure side gap 6 to the low pressure side gap 7. This will be prevented.

The seal ring 1 has a cut portion (hereinafter referred to as a joint) as shown in ) in FIG. Press it onto surface 5.

In order to prevent fluid from leaking from the joint 8, the cut portion of the seal ring 1 has conventionally been shaped as shown in FIGS. 1(4) and 1(B). In FIG. 2(4), the stepped end portions 9 are arranged alternately, and the end surfaces 9A that contact each other in the circumferential direction are brought into close contact to form the abutment 8. Figure 2 (B
In the example of ), a plurality of seal rings 1 having abutments 8 facing each other on the negative side are arranged so that each abutment 8 is shifted, and the surfaces of adjacent seal rings 1 that contact each other [are assembled in a dense layer]. .

However, in the conventional shaft seal device as shown in FIG. 2(4), the end surface 9 of the double stepped end 9 of the abutment
It is difficult to machine the fitting 08 so that A is in close contact with the end face 9A, and depending on the precision of the work, the end face 9A may not be in close contact with each other, resulting in fluid leakage. In addition, in the shaft seal device shown in FIG.
There is a problem that the abutments 8 of adjacent seal rings 1 may coincide with each other, making it impossible to completely prevent fluid from leaking.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shaft seal device that solves these conventional problems and can completely seal the fluid at the joint portion of the seal ring.

Hereinafter, the present invention will be described in detail with reference to the drawings. Figures 3 (5) and (B) show an embodiment of the shaft seal device of the present invention, and Figure 1 (4) and ω) show an embodiment of the shaft seal device of the present invention. This is a seal ring that fits into the device-like groove 3. As shown in FIG. 3 CB), the seal ring /6 is provided with an abutment /7.

On both sides of this abutment in the circumferential direction, the center of the seal ring in the circumferential direction is cut out so that the depth in the radial direction of the seal ring is deeper than the radial depth of the abutment at the opposite end.
), an arcuate groove/g is formed as a partition plate insertion part.

A circular arc-shaped partition plate 19 as shown in FIG. 3 (J3) is inserted into this groove. The arc of this partition plate /9 is the same as the circular arc of the seal ring /A, and when the seal ring /6 with the partition plate /9 inserted into the groove /S is crimped to the inner peripheral surface 5 of the holder J, The outer periphery of the partition plate 19 is made to match the outer periphery of the groove /S and not to come into contact with the rotating shaft 2. The seal ring/6 with the partition plate 19 fitted into the groove/g as described above is fitted into the annular groove 3 to constitute the shaft sealing device of the present invention.

The shape of the partition plate insertion part is not limited to the circular arc groove /g of the top peeling, but any shape can be used as long as it can fit the partition plate /9 that can completely close the gap of the joint /7. It may be of any shape. For example, as shown in Figures 5 and (J3), the partition plate insertion part can be formed by providing a groove 2 penetrating from the outer circumferential surface A to the inner circumferential surface 2/f3 in the seal ring A. may be formed.

In addition, instead of forming the first partition plate insertion part into a groove shape as in the two examples mentioned above, it is possible to make the seal ring, one of the two partition plates, as shown in Fig. The part corresponding to the abutment/7 on the side surface may be cut out in an arc shape, or the side surfaces of the seal ring on both sides of the abutment/7 may be completely cut out to form the partition plate insertion portion.

As mentioned above, in the shaft seal device of the present invention, when this is applied to a rotating shaft system as shown in FIG.
The fluid that is about to leak to the low pressure side gap 7 through 7 is
Partition plate/? sealed by.

Regarding the insertion of the partition plate /q into the insertion part, when the device of the present invention is applied to a rotating shaft system where there is no pressure difference on both sides of the seal ring /6, the partition plate /9 should be inserted tightly. Ensure that the above sealing is complete. On the other hand, when the device of the present invention is applied to a rotating shaft system in which there is a pressure difference on both sides of the seal ring/B, the partition plate/q does not need to be tightly fitted.

As explained above, in the present invention, a groove or a notch is formed on the circumference of the seal ring that fits into the annular groove formed on the circumference of the rotating shaft so as to include the joint part of the seal ring. By forming a partition plate insertion part and arranging a partition plate corresponding to the shape of the groove or notch in the partition plate insertion part, the seam part is completely sealed. This provides the effect of preventing fluid leakage from the joint portion of the seal ring. Moreover, since the above-described insertion portion of the partition plate 4 can be easily machined without requiring a special machine tool, manufacturing costs can be reduced.

In addition, especially when the partition plate insertion part is shaped like a groove, the partition plate inserted into the groove does not directly slide on the wall surface of the annular groove of the rotating shaft. It can be selected without considering sliding resistance.

Furthermore, in the present invention, -C allows only the existing seal ring of the conventional device to be replaced with the seal ring of the above-mentioned form without changing other members constituting the shaft seal device. It is easy to apply to rotating shaft systems.

Note that the present invention is not limited to the above-mentioned example of a gas turbine, but is of course effective when applied to any rotating shaft system.

[Brief explanation of the drawing]

FIG. 1 (4) and Φ) show an example of the configuration of a conventional shaft seal device, and FIG. A plan view showing two examples of a seal ring used in a conventional device, and FIG. figure,
Figure 7 (4) and ω), ! rFyJ (4) and (
B), FIG. 6 (4) and ω), and FIG. 7 (4) and (B) are a plan view and a front view, respectively, showing four examples of seal rings used in the device of the present invention. ... Seal ring, C... Rotating shaft, L...
・Retainer, j...Retainer inner peripheral surface, 6
...High pressure side gap, ri...Low pressure side gap, gap...
...Aiguchi? ...Stepped end of seal ring, 9A...End face, /A0.2j, 24...Seal ring, /7...
Joint opening, 7g0.2/...Groove on seal ring, /q
...Partition plate, -Person...Seal ring outer circumferential surface, -B...Seal ring inner circumferential surface. Patent applicant: Nissan Motor Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] A shaft sealing device in which a seal ring having a cut portion is fitted into an existing groove formed on the periphery of a rotating shaft, which may include a partition plate, and the partition plate may be fitted into the cut portion of the seal ring. A shaft sealing device characterized in that a partition plate fitting part is provided, and the partition plate is forced into the fitting part to seal between both sides of the seal ring.