JPH0255670B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carbon ring seal used as a shaft sealing device for rotating machines that handle air or steam, such as compressors and blowers.

[Conventional technology]

As shown in Figures 3 and 4, the structure of conventional carbon ring seals for rotating machinery is that the casing is generally divided into upper and lower halves to facilitate disassembly and inspection, and the carbon ring seal is also split in the radial direction. It is designed so that it can be removed. This type of split carbon ring seal holds a split carbon ring 11 divided into three or more pieces with a long guard spring 13 provided in a groove in the circumferential direction of the back surface of the split carbon ring 11, and presses the carbon ring 11 against the shaft. , leakage of fluid (air, steam, etc.) is restricted by reducing the gap between the shaft and the carbon ring. Reference numeral 12 denotes an abutting surface of each split carbon ring, and the carbon ring is housed and held in a groove provided in the retainer 14.
The retainer 14 is divided into upper and lower parts, and 15 is an abutting surface thereof. To assemble a conventional split carbon ring seal, the garter carbon ring 13 is stabilized in the circumferential groove on the back of the split carbon ring, and the inner surface is in contact with the shaft, and the inner surface is sequentially inserted.Finally, both ends of the garter spring 13 are inserted. They were connected and fitted around the outer circumference of the shaft.

[Problem that the invention seeks to solve]

However, such conventional split-type carbon ring seals have a structure in which each split carbon ring is held by a garter spring, which makes assembly and separation difficult and requires a lot of effort. It was often damaged.

[Means for solving problems]

In order to solve the above problem, grooves perpendicular to the circumferential direction are provided on the outer periphery of a plurality of split carbon rings. A plurality of guide recesses are provided at the bottom of the circumferential groove, into which the engaging protrusions are fitted so as to be freely protrusive and retractable, and the tips of the engaging protrusions are inserted into the recesses on the outer periphery of the split carbon ring. The retainer 25 is provided with a through hole that is fitted into the groove and penetrates from the outer periphery of the retainer 25 to the guide recess 27, and the engagement protrusion 29 is provided with a hole for connecting the operating rod at a position opposite to this through hole. It consists of a split carbon ring seal. Stepped portions facing each other are provided on the end face of the split carbon ring closer to the outer periphery and the end face closer to the inner periphery of the retainer to prevent the split carbon ring from coming off toward the inner periphery during assembly.

[Effect]

To assemble the split carbon ring, first insert the split carbon ring into the inner groove of the retainer from the abutting surfaces of the upper and lower retainers, and first insert the guide protrusions from the outer periphery of the retainer as shown in Figure 2. A hole that penetrates the guide recess and a screw hole opposite to this through hole are provided at the bottom of the guide protrusion, and a bolt is threaded through the through hole and screwed into the screw hole of the guide protrusion, and the bolt is pulled under tension. Then, the guide protrusion is buried in the guide recess, and in this state, each split carbon ring is sequentially inserted into the inner circumferential groove of the retainer. The tip end of each guide protrusion provided on the retainer fits into the groove of each split carbon ring. At this time, the split carbon ring and the stepped portion provided on the retainer abut each other, thereby preventing the carbon ring from flying inward and separating from the retainer. Also, when disassembling the split carbon ring and replacing it with a new one, it is sufficient to perform the reverse operation during assembly. The tips of the guide protrusions, which are biased by springs, are fitted into grooves provided in the direction orthogonal to the circumferential direction on the outer periphery of the split carbon ring, so a radial force acts on the split carbon ring, causing it to rotate. It exerts a sealing effect on the shaft. At the same time, it also functions to prevent rotational movement along the rotation axis.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 21 indicates a split carbon ring, and usually three to eight pieces form a carbon ring seal. The divided carbon rings 21 are in contact with each other at abutting surfaces 22. The outer periphery of the split carbon ring 21 has a concave groove 23 in a direction perpendicular to the circumferential direction, and a stepped portion 2 on one end surface closer to the outer periphery.
4 are provided respectively. On the other hand, the retainer 25 is provided with a groove 26 on its inner peripheral surface in which the split carbon ring 21 is accommodated and held, and a plurality of guide recesses 27 are provided at appropriate positions at the bottom of the groove. A guide protrusion 29 biased by a spring 28 is fitted into 27 so as to be freely retractable.
Furthermore, a stepped portion 30 facing the stepped portion 24 of the split carbon ring 21 is provided on one end surface of the groove 26 of the retainer 25 near the inner periphery. When the split carbon ring 21 is attached to the retainer 25, the stepped portions 24 and 30 engage to prevent the split ring 21 from jumping out inward. In addition, this stepped part 2
4 and 30 are provided on one side, but may be provided on both sides. Reference numeral 31 indicates abutting surfaces of the upper and lower retainers 25.

When attaching the split carbon ring 21 to the retainer 25, it is necessary to insert the guide protrusion 29 into the guide recess 27.
As shown in the figure, a through hole is provided in the guide recess 27 of the retainer 25, and a screw hole is bored in the guide protrusion 29 at a position facing the through hole. Then, by inserting a bolt through the through hole, screwing it into the screw hole, and pulling the bolt, the guide protrusion 29 can be completely recessed into the guide recess 27. Other means include:
A long groove may be formed in the side wall of the retainer, and a hole may be formed in the guide protrusion, and a pin may be inserted from the outside and moved along the long groove to retract the guide protrusion.

〔Effect of the invention〕

In this invention, each split carbon ring is held in a retainer while ensuring the degree of freedom of movement of the split carbon ring, and is also pressed toward the center of the rotating shaft by the guide protrusion, so that it has a sealing effect against the rotating shaft. In addition to fully exerting its function, it also prevents the retainer from being driven by the rotating shaft.Moreover, an operating rod such as a bolt is inserted from the outside of the retainer through the through hole and connected to the connecting hole of the engaging protrusion. The engaging protrusion is inserted into the guide recess from the outside against the spring, and in this state, each split carbon ring can be sequentially inserted into the inner groove of the retainer, simplifying assembly and splitting without requiring labor. In addition, in the dividing and assembling work, the divided carbon rings are first housed in the retainer and attached or removed, so the work is extremely easy and reliable, and there is no risk of damage to the carbon rings.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line - - in FIG. 1, FIG. 3 is a sectional view showing a conventional split carbon ring seal, and FIG.
The figure is a sectional view taken along the line -- in FIG. 11, 21...Split carbon ring, 12, 22
...Abutment surface, 13...Garter spring, 14...Retainer, 15...Abutment surface, 23...Concave groove, 24, 30...
Stepped portion, 25... Retainer, 26... Concave groove of retainer, 27... Guide concave portion, 28... Spring, 29...
Guide protrusion.

Claims (1)

[Claims] 1. A concave groove 23 perpendicular to the circumferential direction is provided on the outer periphery of the split carbon ring 21, which constitutes a seal by abutting a plurality of split carbon rings 21 with each other at their abutting surfaces. A plurality of guide recesses 27 are provided at the bottom of the inner peripheral groove of the retainer 25 that accommodates and holds each split carbon ring 21 on the outer peripheral side of the retainer 25 . The tips of the engaging protrusions 29 are fitted into the grooves 23 on the outer periphery of the split carbon ring, and the through holes passing from the outer periphery of the retainer 25 to the guide recesses 27 are inserted into the retainer. 25, and the engaging protrusion 29 is provided with a hole for connecting the operating rod at a position opposite to the through hole. 2. The first aspect of the present invention is characterized in that stepped portions 24 and 30 for locking are provided on the end face of the split carbon ring 21 near the outer circumference and the end face of the retainer 25 near the inner circumference, respectively. Split type carbon ring seal.