JPH0214938Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is used to remove the seat ring, which is the stationary sliding ring of a mechanical seal related to shaft sealing technology, from the inner periphery of the shaft hole of the equipment housing to the outside of the machine. This invention relates to a seat ring removal jig used for.

[Problem that the invention attempts to solve]

Conventionally, as shown in FIG. 11, the space between the housing 1 of various rotating equipment and the rotating shaft 3 inserted into the shaft hole 2 of the housing 1 is sealed, and the in-machine oil A is removed from the machine (B, A mechanical seal 4 is installed and used to prevent leakage toward the atmosphere.

The illustrated mechanical seal 4 is airtightly fitted and fixed to the stepped portion 1a of the single shaft hole 2 of the housing via an O-ring 6, and also includes a snap spring fitted into a groove 8 formed on the circumferential surface of the shaft hole 2. Seat ring 5 was prevented from exiting to outside the aircraft B by 7.
and is attached to a case 10 fitted externally to the rotating shaft 3, sealed with the rotating shaft 3 by an O-ring 11, and urged toward the seat ring 5 by a coil spring 12. The in-machine oil A is sealed by close sliding with the seal ring 9 as the rotary shaft 3 rotates, but when the mechanical seal 4 is disassembled and removed to the outside of the machine B, the work efficiency is Need to improve.

The present invention is an attempt to meet the above-mentioned needs and to provide a removal jig configured to easily and quickly remove the seat ring 5.

[Structure of the idea - Examples]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 2 to 4, reference numeral 21 denotes a body in which two engaging pieces 21b are extended in the axial direction from one end of an annular base 21a at a 180-degree symmetrical position, and each engaging piece 21b is extended in the axial direction. The tip expands into a T-shape (see Figure 2), is curved in the circumferential direction so as to form part of a torus (imaginary) (see Figure 4), and is knurled on the outer peripheral surface. is being carried out. Reference numeral 22 denotes a shaft that is concentrically and rotatably inserted into the inner periphery of the body 21 via a bearing 23, and at the left end in the figure, there is a shaft that rotates the shaft 22 with respect to the body 21. Sesame bar 2
4 is fixed with 25 bolts. Moreover, the shaft body 22
The right end extends to the inner periphery of the tip of the engaging piece 21b of the body 21, and a pressing plate 26 is integrally formed at the tip. This pressing plate 26 is perpendicular to the axis and has an elliptical shape as shown in _{FIG .} , spacing) to a smaller diameter,
The long axis _D2 is larger than the inner diameter _D3 . Further, as will be described later, a shaft insertion hole 22a into which the rotating shaft 3 is inserted during use is formed in the shaft core portion of the shaft body 22 so as to open at the right end. 27 is a snap spring for preventing the bearing 23 from coming off.

The extracting jig having the above-mentioned structure has a shaft body 22 which is placed between the tips of a pair of engagement pieces 21b, 21b provided on the body 21, so that the short diameter portion of the press plate 26 is opposed to the inner periphery of each tip. In the rotated position (the state shown in Figs. 2 to 4), as shown in Fig. The snap ring 7 for preventing the seat ring 5 from slipping out is removed in advance, and the tip of the rotating shaft 3 (the left end in the figure) is inserted into the shaft insertion hole 22a. Piece 21
The tips of b and 21b are loosely inserted into an annular recessed step 5a formed in a portion of the seat ring 5 closer to the inner periphery of the outer end of the seat ring 5. Next, while leaving the body 21 as it is, the bar 24 is rotated and the shaft body 22 is rotated approximately 90 degrees with respect to the body 21, so that both engaging pieces 21
The long diameter portion of the pressing plate 26 is located between the tips of b and 21b, and the diameter of both engaging pieces 21b and 21b is expanded in the outer radial direction (the state shown in FIG. 6). , 21b are pressed onto the circumferential surface of the recessed step 5a of the seat ring 5, as shown in FIG. By pulling this out toward the outside B of the machine, the seat ring 5 is moved accordingly, and is pulled out to the outside B of the machine as it is. After pulling out, the bar 2
4 is rotated back, the press-fitting engagement of the engaging pieces 21b, 21b with the recessed step portion 5a is released, and the seat ring 5 can be removed from the jig.

Note that the configuration of the above embodiment may be changed as follows.

The pressing plate 26 is formed into an elliptical shape, but as shown in FIGS. 7 and 8, a part of the pressing plate 26 is cut out based on a perfect circular shape (cylindrical shape) to form long and short diameter portions D. ₄ , so as to form D ₅ ,
The purpose is to simplify the production of the pressing plate 26'.

In contrast to the two engaging pieces 21b, 21b provided at 180-degree symmetrical positions, as shown in FIG. ', 21b', 21b' are provided, and the shape of the pressing plate 26'' is changed so that it can be rotated approximately 60 degrees. In the figure, D ₆ indicates the long diameter portion and D ₇ indicates the short diameter portion.

Instead of the bar 24, a first
Attach the handle 24' as shown in Figure 0.

[Effect of idea]

As explained above, the seat ring removal jig of the present invention is a seat ring of a mechanical seal that is fitted into the inner periphery of the shaft hole of the equipment body and has a recessed step on the inner periphery of the outer end surface of the machine. A seat ring removal jig for removing the seat ring from the machine includes a body having engaging pieces arranged at equal intervals on the axial tip thereof to be inserted into the recessed step of the seat ring and expandable in the radial direction; a shaft body provided with a pressing plate which is concentrically and rotatably inserted into the inner periphery of the body and has a long diameter portion and a short diameter portion equally spaced on the inner periphery of the engaging piece of the body; The inner diameter of the engaging piece of the body is formed to be smaller than the diameter of the longer diameter portion of the pressing plate, and the engaging piece is fitted into the recessed step of the seat ring by engagement of both;
This allows the seat ring to be removed easily and quickly, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

1 and 5 are front sectional views showing the usage state of a seat ring extraction jig according to an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a front sectional view of the same, and FIG. 6 is a right side view of the same, FIGS. 7 to 9 are side views of a seat ring removal jig according to a modified example, FIG. 10 is a side view of the handle, and FIG. FIG. DESCRIPTION OF SYMBOLS 1... Housing, 2... Shaft hole, 3... Rotating shaft, 4... Mechanical seal, 5... Seat ring, 5a... Concave step, 9... Seal ring, 21
...Body, 21a...Base, 21b, 21b'...
...Engagement piece, 22...Shaft body, 22a...Shaft insertion hole,
23...Bearing, 24...Bar, 26,2
6', 26''...Press plate, A...In-machine oil, B...Outside the machine.

Claims (1)

[Scope of utility model registration request] A seat ring removal jig is used to remove the seat ring of a mechanical seal, which is fitted into the inner periphery of the shaft hole of the equipment housing and has a concave step formed on the inner periphery of the outer end surface of the machine, to the outside of the machine. a body formed with equally spaced engaging pieces that are inserted into the concave stepped portion of the seat ring and expandable in the radial direction; a shaft body provided with a pressing plate having a long diameter portion and a short diameter portion equally spaced on the inner periphery of the engaging piece; A seat ring removal jig characterized in that the former engagement piece is formed smaller than the diameter, and the former engagement piece is fitted into a recessed step portion of the seat ring by engagement of the two pieces.