JPH0227728Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of an assembly joint in a shaft sealing device related to shaft sealing technology.

[Conventional technology]

Conventionally, in an assembly structure of a shaft sealing device in which a seal ring and a floating sheet are brought into close contact with each other in the axial direction and slidably rotated, as shown in FIG. A structure is known in which a bolt e is fastened and fixed via a holder d when assembling and joining airtightly via an O-ring c carried on a retainer b, and the sliding surface a1 of the seal ring a is The joint surface a2 formed parallel to the supporting surface b of the retainer b
1 and constitutes a sliding surface a1 perpendicular to the axis.

[Problem that the invention attempts to solve]

However, according to the above-mentioned conventional assembly and joint structure, the joint surface a2 of the seal ring a is pressed against the supporting surface b1 of the retainer b, so that the surface accuracy of the supporting surface b1 is lower than that of the sliding surface a1 of the seal ring a. This causes a problem in that the production cost is high because machining precision is required not only on the joint surface a2 of the seal ring a but also on the support surface b1 of the retainer b. .

In view of the above-mentioned problems, the present invention provides a shaft seal device having a structure in which a seal ring is joined and assembled to one end of a retainer, which has a high-precision sliding surface and an assembly joint in which the precision of the retainer end surface does not extend to the sliding surface. The purpose is to provide a structure for the shaft sealing device, and to reduce the production cost of the shaft sealing device.

[Means for solving problems]

The structure of the assembly joint in the shaft sealing device of the present invention is such that the joint surface of the seal ring is assembled in contact with one end surface of the retainer, and a joint relief part structure is formed on the joint surfaces of both members, and the seal It has a structure that prevents the influence of the retainer end surface from propagating to the ring, and it is located on the outer circumferential side of the annular sealing structure formed between the joint surfaces perpendicular to the axis of the retainer and seal ring, and midway in the radial direction between the joint surfaces. located,
An annular recess is provided on the joint surface of at least one of the retainer or the seal ring to form an annular non-contact surface.

[Effect]

Therefore, the seal ring is connected only to the inner and outer peripheral edges of the joint surface perpendicular to the axis of the retainer, and since the inner diameter is sealed by the annular sealing structure, there is no contact with the annular non-contact surface. As a result, the propagation of the surface shape of the retainer is interrupted, the sliding surface accuracy of the seal ring is independently demonstrated, and the sealing performance is maintained.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 are front sectional views showing the first embodiment.

Reference numeral 1 designates an annular seal ring having a high-precision sliding surface 2 perpendicular to the central axis o at one end, and a joint surface 3 parallel to the sliding surface 2 at the other end. At the same time, an engagement step portion 4 is formed on the outer peripheral portion. Reference numeral 5 denotes a cylindrical retainer that supports the seal ring 1 on one end surface, and a support surface 6 that is perpendicular to the axis and is the joint surface with the joint surface 3.
An annular groove 8 is formed close to the inner diameter side of the shaft hole 7, and an annular recess 9 is formed on the outer circumferential side of the annular groove 8 and at a radially intermediate position of the supporting surface 6, so that the supporting surface 6 is slightly It becomes a retreat. The above seal ring 1 is
With the O-ring 10 fitted in the annular groove 8, the joint surface 3 is brought into contact with the support surface 6, and the annular holder 11 is fastened to the support surface 6 side of the retainer 5 with the bolt 12, and the front end of the retainer 5 is engaging the inner edge 13 formed in the portion with the engaging step portion 4 of the seal ring 1;
The O-ring 10 is fixed to the supporting surface 6 of the retainer 5 by fastening the bolt 12, and the O-ring 10 is held between the annular groove 8 and the joint surface 3, and the annular sealing structure 14
An annular non-contact surface 15 is formed on the outside of the annular sealing structure 14 by the annular recess 9 and the joint surface 3.

In the figure, reference numeral 16 denotes a floating sheet supported so as to be able to slide and rotate in close contact with the sliding surface 2 of the seal ring 1.

According to the above configuration, the joint surface 3 of the seal ring 1
are pressure-welded only at the inner and outer peripheral edges of the bearing surface 6 of the retainer 5, so the accuracy of the bearing surface 6 of the retainer 5 has little effect on the joint surface 3 of the seal ring 1, and therefore the bolt 12 is fastened, no surface distortion occurs on the sliding surface 2, and high surface accuracy can be maintained. As a result, the shaft sealing performance of the sliding surface 2 of the seal ring 1 and the floating sheet 16 can be maximized.

Next, FIG. 3 shows another embodiment of the present invention, and to explain only the parts that are different from the first embodiment, the structure of this embodiment is an annular recess formed in the supporting surface 6 of the retainer This is a modification of the cross-sectional shape of No. 9. That is, this embodiment achieves the objective by forming an annular non-contacting surface 15 between the annular recess 9 and the joint surface 3 of the seal ring 1 so that the two members do not come into surface contact over the entire surface. The annular recess 9 for retreating from the support surface 6 exhibits the same effect no matter what cross-sectional shape it has.

Although not shown in the drawings, in the present invention, an annular recess is formed on the seal ring 1 side to form the annular non-contact surface 15, or an annular recess is formed on the retainer 5 and the seal ring 1 side. It is also possible to have a structure in which the assembly joints are assembled facing each other to form an annular non-contacting surface 15.

[Effect of idea]

As described above, the structure of the assembly joint in the shaft seal device of the present invention is such that the seal ring is pressure-welded to the retainer only at the inner and outer peripheral edges, so that the sliding surface of the seal ring is It achieves a structure that causes almost no surface distortion, does not impair sealing performance, and does not require high machining accuracy of the supporting side member of the seal ring, so production costs can be reduced. The practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of a seal ring assembly showing a first embodiment of the structure of the assembly joint in a shaft seal device according to the present invention, and FIG.
3 is a half-cut sectional view showing another embodiment, and FIG. 4 is a half-cut sectional view showing the structure of a conventional assembly joint. DESCRIPTION OF SYMBOLS 1... Seal ring, 2... Sliding surface, 3... Joint surface, 5... Retainer, 6... Supporting surface, 9... Annular recess, 10... O-ring, 11... Holder,
12... Bolt, 14... Annular sealing structure, 15...
...Annular non-contact surface.

Claims (1)

[Scope of utility model registration request] In a shaft sealing device having a structure in which a seal ring is fastened and fixed to one end of a retainer via a bolt,
On the outer peripheral side of the annular sealing structure formed between the joint surfaces perpendicular to the axes of the retainer and the seal ring, and located midway in the radial direction between the joint surfaces, at least one of the retainer and the seal ring is located. A structure of an assembly joint in a shaft sealing device, characterized in that an annular recess is provided in the joint surface to form an annular non-contact surface.