JPS582694A - Seal device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a seal pocket f11 whose main purpose is to seal gas around a shaft in a sliding S such as a sliding shaft in 1% in a sealing device that is overloaded in nuclear reactor equipment, etc. It is.

Conventionally, this woodcutter's equipment was 40 as shown in Figure 1.
In the figure, (ri is 7 points, ((2) Hv V-shaped packing - 1vnda supporting the cat's V-shaped packing, t
4Jrr Patsukin Oshimi * Da) Shiyohi (5b) H adapter 4. (6) Spacer, (7) 7 lunges on σ, (8
) is a backup seal gas supply pipe, and (9) is a scraper installed under the above-mentioned hood.

I will explain the operation in a moment. Guide to the seal mechanism.

Cross section 7 in the cylindrical i-lunge (1) being positioned
The letter-shaped annular packing (2) is arranged in two stages of ToJ1 and three stages of ToJ1 and rj, and with the thread facing downward, smooth insertion from the top reduces damage to the packing. In order to obtain a uniform tension force on the packing (2) and the sliding shaft, etc.; the spring (8), the packing presser 141 (6a), (sb) and the sube? (6)
It is held in the upper 7 langes ff) and is pressed against the V-shaped gasket (which improves the sealing performance due to the flange, increasing the force applied to the sliding shaft and blowing gas into the reactor. Due to the down, gas was purged from the backup seal gas supply pipe (8) between the ■-shaped gaskets.

Furthermore, nine scrapers are placed below the sealing device.
The rs sliding shaft rises, and one adheres to the shaft 1111 and removes obstacles such as sodium 1111.
This prevents K from entering and damaging the sealing performance.

As mentioned above, the rigidity of the conventional packing is large because the packing is shaped like the letter ■, the tightness of the packing is small, and the sealing performance is greatly affected by the outer diameter precision and eccentricity of the sliding shaft. It's middle water.

In addition, when pressing with a spring, the force may be reduced due to O creep at high temperatures, etc.

Maintenance problems have arisen due to the increased sliding resistance due to the ■-shaped packing that overlaps multiple IRKs and the difficulty in determining the deterioration of individual packings.

In addition, the scraper has many drawbacks such as damage due to sliding resistance and wear due to significant wear when removing sodium etc. from the shaft IN member.

This invention has been made in order to eliminate the 100 drawbacks mentioned above, and the purpose is to provide a durable sealing device with good sealing properties, low sliding resistance, and the following. In order to explain the power of this invention as shown in Fig. 2, it is shown in Fig. 0 that the decoy is a U-shaped annular packing (61), and is made of fluororubber having durability, heat resistance, and durability. It is formed. ai+H sliding shaft Table 1U-shaped scraper (hereinafter referred to as 1) that scrapes off 9Nl (sodium) adhering to
It is made of fluororubber, which is durable, heat resistant, and durable. (to) the above U-shaped annular packing 11, U-shaped thick waterfall packing all
The main body of the sealing device that guides and positions the ground scraper I, the radially arranged spring installed in lLl to ensure the followability of the ground scraper I to the sliding shaft, and the vertical guide of the uH ground scraper I.
T-preventing spacer, 1llj U-shaped annular spacer
UA packing C'tl for storing, @*KO OU packing Roy / O-ring for sealing between III and the above-mentioned sealing device main body (2), Futsuji for connection with TRSRT and other equipment, 1IrtU packing El # / u IJj or annular packing with the fixing bolt between the sealing device main body I and
%O to be removed during maintenance. Ql and @ke are gas purge systems for the purpose of back-up sealing to the U-shaped annular/<ykin 10 gap and 1 part of the scraper.

The operation of the apparatus configured as described above will be explained using the drawings. Figure 3 shows the schematic positional relationship when the device of the present invention is installed in a heat-cooled fast breeder reactor, for example.
In the figure, the sealing device main body as rt is integrated with the equipment mount (5) that houses the guide pipe @ that is the object to be sealed, and the fuel exchange hole door valve in the upper part of the reactor and the equipment door pulp ( 2), the guide tube artx passes through the hold-down shaft 2 in the sub-furnace, and is inserted into the furnace interior.

Here, since the U-shaped annular packing is arranged internally under the aart, the insertion resistance and sliding resistance when inserting the guide tube are small, and because of the U-shaped shape, even if the guide tube itself has a Kll center, the followability is jLV' The upper U-shaped annular gasket seals from the gas purge system to the threshold without impairing its sealing performance. In the afternoon, the tension on the guide pipe increases,
The lower U-shaped annular gasket has the effect of gas blowing around the guide tube. For this reason, the above U#F shape packing (to)
It has the same shape as , and is supported by a spring ILIK in the radial direction.

It should have the effect of keeping the tension force on the guide pipe constant.
Tightening with the IJ-shaped loam-like ring-shaped ring is aimed at equalization.

Furthermore, in order to have a grasshopper up seal and a gasp n-down effect in the KNa scraper aη section, a gas purge system is installed to eliminate any adhesion to the upper U-shaped annular packing. Karasu scraper Q114hU
Because of the letter shape, unlike the prior art), there is no breakage due to the clump phenomenon when sliding the guide tube, and the ability to scrape off lumps is improved by allowing a large amount of contact with the guide tube w11 surface.

% upper BUt-U-shaped annular packing and Kono scraper αD
Since the force is balanced when tightening the guide tube with the
There is no direct negative effect on the durability of the #F shaped ring.

In the above description, the apparatus of the present invention has been described in terms of excessive use in a fast breeder reactor cooled to water, but it can be similarly applied to a light water reactor and a water-cooled fast breeder reactor.

As described above, according to the present invention, the gasket is made into a U-shape, and the KNI scraper is also made into a U-shape.

The waterfall scraper is urged in the axial direction by an elastic body, and the above U
Supply backup seal gas to the shape seal part.
As a result, there are effects such as improved sealing performance, durability, Na electrification performance, and maintainability (not to mention improved reliability).

[Brief explanation of the drawing]

Rattan 1 Figure 6 Cross-sectional view showing a conventional sealing device, 2nd g1rx
Honshu'A Ov -A fit OIli ii E
s t83 Figure rt Non-explosion seal *to operation vi
This is a clear diagram. 111 to 1/m'c, alrtU-shaped, <I-kin, Ulr! ? '4 Scrap pearl seal device main body, screen □ U, aa (i spacer, aul J pa, Kinkan gas barge system. In the figure, the same reference numerals indicate the same parts and the corresponding parts are shown in 9.) Figure 2 vJB figure procedural amendment (spontaneous) Mr. Commissioner of the Japan Patent Office, case description Patent application 1982-1017892, title sealing device of invention, person making the amendment (+) 5. 6. Contents of amendment 1) "Durability, heat resistance" on page 4, line 3 of the specification is amended to "sodium resistance, heat resistance." 2) Amend "durability, heat resistance" in line 7 of page 4 of the specification to "sodium resistance, heat resistance"03) 4fi of the specification
In the 20th line, "Between Patsukin (10) (10)" is corrected to "Between Patsukin (lO)". that's all

Claims (1)

[Claims] A tJ packing block has an insertion hole through which a sliding member is inserted, and a plurality of annular packings having a U#F cross section are arranged on the inner circumferential surface of the insertion hole, and a tJ packing block has an annular packing with a U#F-shaped cross section arranged in multiple stages on the inner peripheral surface of the insertion hole. A Ufell-shaped scraper disposed in contact with each other, an elastic body that biases toward the center of the annular scraper and the insertion hole, a sealing device main body that holds the elastic body and the U packing block, and the U'! A sealing device characterized in that it is equipped with a gas supply system for a #-type seal gas.