JPS602552B2 - Patsukin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seal packing for a rotating body or a large-diameter structure.

As an example of a conventional rotating body, a nuclear reactor vessel of a fast breeder reactor is shown in FIGS. 1 and 2.

In FIG. 1, 01 is a reactor vessel, 02 is a fixed base, 03 is a bearing, 04 is a rotating plug, and 05 is a balloon seal packing.

Figure 2 shows the details of the balloon type seal packing 05. The balloon type seal packing 05 is an elastic body made of soft rubber, soft synthetic resin, etc., and has a hollow part 05, and its upper part is in close contact with the rotating plug 04. Ritsupushir 05
-2 is formed in the hollow part 05-1, and a gas introduction nozzle 05-3 is connected to pressurized feed equipment (not shown).
is provided. That is, the rotary plug 04, which closes the upper part of the container 01 and performs heat shielding, radiation shielding, and rotational movement for positioning during fuel exchange, has an extremely large diameter (approximately 6 kites in diameter), so it does not oscillate during rotation ( wave) is large inside, reactor vessel 0
The balloon-type seal packing 05 provided at the airtight boundary between the cover gas layer in the inner part of the cover gas layer 1 and the atmosphere must maintain a sealing function while following this example. Gas was supplied to the engine to adapt it to the oscillations (waves) of the rotating plug 04.

However, in these conventional products, the balloon type seal packing 05 has a thin structure with emphasis on conformability.
Rotating plug 04 and balloon seal packing 0 during rotation
The balloon-type seal backing 05 may be rubbed and cut due to the mechanical resistance acting between the seals 5 and 5, which poses a problem in maintaining the sealing function.

The present invention eliminates the above-mentioned conventional drawbacks, and develops a packing that has the ability to imitate the rotational oscillation (wave motion) of a rotating plug and can sufficiently withstand mechanical drag during rotation, thereby improving the integrity of the sealing function. The purpose is to increase

The structure of a packing according to an embodiment of the present invention will be explained with reference to FIG.

1 is a rigid ring with a rectangular cross section, and is made of hard synthetic resin, metal, or the like.

2, 3, and 4 are ring-shaped diaphragm-type balloons attached to the upper, inner, and outer surfaces of the rigid ring 1, respectively;
It is made of hard rubber or weakly hard synthetic resin, and is provided with gas introduction passages 6, 7, and 8 that communicate with the manifold 5 bored in the rigid ring 1, respectively.

The manifold 5 is provided with a gas introduction nozzle 9 connected to pressurized gas supply equipment (not shown). Around the Okayama body ring and the balloons 2, 3, and 4 is a soft elastic sealing body 10 made of hard rubber, hard synthetic resin, etc.
The surface of the seal body 10 constitutes seal surfaces 10-1, 10-2, 10-13, 10-4, and 10-5.

The upper surface of the balloon 2 forms a concave shape 2-1, and the sealing surface 10
Between 11 and 10 and 2, there is a recess 10-6 following the concave shape 2-1.
, and the appropriate amount of lubricant is filled there. Seal body 1 containing Okayama body ring 1 and balloons 2, 3, 4
The river is mounted in a groove 12 provided in a fixed (or rotating) structure 11. Next, the operation of the present invention will be explained with reference to FIG.

The seal body 10 installed in the groove 12 of the fixed (or rotating) structure 11 that is pressed against the rotating (or fixed) structure 13 installed opposite to the fixed (or rotating) structure 1 1 is not shown. Pressurized gas is guided from the pressurized gas supply equipment to the manifold 5 through the introduction nozzle 9, and the manifold 5
The balloons 2 are distributed in gas introduction channels 6, 7, and 8 within the balloon.
, 3, 4 are filled and expanded, and the seal surfaces 10-1, 10-2 of the seal body 10 rotate (or fixed) structure 1.
3, the sealing surfaces 10-3, 10-5 are on the side of the groove 12,
The seal surfaces 10-4 are brought into close contact with the bottom surface of the groove 12 by the pressing reaction force of the seal surfaces 10-- and 10-2, respectively, and the gas layer 14 is
and a gas layer 15.

The balloon 2 is expanded or compressed in response to the rocking (wave motion) during the rotational movement of the fixed (or rotating) structure 11 and the rotating (or fixed) structure 13 (at this time, the pressurized gas in the balloon 2 is expanded or compressed). (compressed), the sealing surfaces 10-1, 10-2 are in close contact with the rotating (or fixed) structure 13 at all times.

Mechanical drag due to sliding during rotation acts between the sealing surfaces 10-1, 10-2 and the rotating (or fixed) structure 13, but in the present invention, the rigid ring is used to protect the balloon 2 and the sealing body covering it. The length in the height direction of 10 is formed sufficiently shorter than that of the conventional one shown in FIG. 2, so that it can sufficiently withstand this mechanical drag. As described above, the present invention forms a plurality of airtight chambers around a rigid ring and an Okayama ring that connect a manifold suitable for a pressurized gas supply source, and a weakly rigid body that connects a manifold to a pressurized gas supply source through a gas introduction path. This is a packing consisting of a soft elastic sealing body that covers a balloon, a balloon, and a rigid ring. 1. An airtight chamber is provided for each sealing surface of the packing, so the packing can be sealed without uneven contact. Extremely sensitive.

2. The rigidity of the packing has been increased by separating the functions of the soft elastic packing and the slightly hard airtight chamber.

3 The rigidity of the entire packing was increased by embedding a rigid ring as in Example 3.

It has extremely excellent effects.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing how the seal packing of the reactor vessel of a fast breeder reactor is used, Figure 2 is a detailed view of the packing part in Figure 1, and a longitudinal cross-sectional view of a conventional one. FIG. 4 is a longitudinal sectional view of an embodiment of the present invention at the same location as FIG. 2, and FIG. 4 is an operational view of FIG. 3. 1: Rigid ring, 2, 3, 4: Balloon, 5: Manifold, 6, 7, 8: Gas introduction path, 10: Seal body, 10
11, 10-2, 10-3, 10-4, 10-5: Seal surface, 11: Fixed (or rotating) structure, 12: Book, 13
: Rotating (or fixed) structure, 14, 15: Gas layer. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A rigid ring having a manifold therein that communicates with a pressurized gas supply source, a weakly rigid balloon having a plurality of airtight chambers formed around the rigid ring and communicating with the manifold via a gas introduction path, the balloon, and the rigid body. A gasket characterized by consisting of a soft elastic sealing body that covers a ring.