JPS60101364A - Shaft seal device - Google Patents

Abstract

PURPOSE:To extend the life of a seal ring while reduce a leak of gas, by using the self-lubricating seal ring with a lip and sealing a shaft so as to prevent the pressure of gas from being applied to a seal ring part other than the lip. CONSTITUTION:A seal ring case 20 is fitted unturnably around a shaft 60 into an oil box 10 which seals by oil the shaft 60. Then a self-lubricating seal ring 30 with lips is fitted into the case 20 so that lips 311, 321 may surround a peripheral surface of the shaft 60, while a retainer ring 40 with a stopper is fitted into the case 20 so that a point end 42 may force the lips 311, 321 to be attached to the peripheral surface of the shaft 60. While a compression coil spring 50 is interposed between the retainer ring 40 and the oil box 10 so as to enable the retainer ring 40 to be pressed. In this way, the shaft is sealed so as to prevent the pressure of gas from being applied to a part of the seal ring 30 except the lips 311, 321, both extending a life of the seal ring 30 and reducing a leak of gas.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft sealing device for a rotating shaft and a reciprocating shaft, and more particularly to a shaft sealing device that can completely prevent leakage of high-pressure gas in gas compressors, vacuum pumps, etc. be.

Conventionally, as a shaft seal device to prevent this type of high-pressure gas leakage, a balanced mechanical seal or a
A device such as that shown in Publication No. 762 was used, but the former is limited to a rotating shaft, has a complicated mechanism and is expensive to manufacture, and also requires time and effort to install and remove, making replacement sealing material expensive. The latter is limited to reciprocating shafts, and the sealing material (hereinafter referred to as ``ring'') has a large pressure-receiving area due to gas pressure, resulting in severe wear and tear.

Therefore, the inventor of the present invention proposed that if a self-lubricating seal ring with a lip is used to seal the shaft so that gas pressure does not apply to any part of the ring other than the lip, the life of the seal ring will be extended and gas leakage will be extremely reduced. , and found that it is suitable for shaft sealing of either rotating shafts or reciprocating shafts,
The shaft sealing device of the present invention was successfully developed.

That is, the present invention is a shaft sealing device in which a rotating shaft or a reciprocating shaft (hereinafter simply referred to as a shaft) is inserted into an oil-sealed oil box so as to be freely rotatable or reciprocally movable, and the oil box includes a seal ring. The case is fitted so as not to rotate around the shaft, and a self-lubricating seal ring with a lip is placed in the seal ring case so that the lip presses the lip of the compost seal ring onto the peripheral surface of the shaft. a shaft seal that bottoms out as much as possible, seals between the presser ring and the seal ring case, and has a compression coil spring interposed between the presser ring and the oil box so as to suppress the presser ring; and a shaft sealing device in which a rotating shaft or a reciprocating shaft (hereinafter simply referred to as a shaft) is rotatably or reciprocally inserted into an oil-sealed oil box, the shaft sealing device having a seal ring case in the oil box. A self-lubricating seal ring with a lip is inserted into the seal ring teeth so as not to rotate around the shaft, and the self-lubricating seal ring with a lip is inserted into the bottom of the seal ring teeth so that the lip surrounds the curved surface of the shaft, and is screwed into the seal ring case. The present invention provides a shaft sealing device in which a retaining ring is screwed into the ring tip so that the lip of the seal ring can be pressed against the shaft circumferential surface.

The present invention will be explained below based on an example with reference to FIG.

The shaft sealing device of the present invention includes an oil box IO, a seal ring nurse 20, a self-lubricating seal ring 80 with a lip, a presser ring 40 with a stopper, and a compression coil spring 50. The oil box IO is a box part 11
and a holding lid part 12, and the inserted rotating shaft or reciprocating shaft 60 is sealed with oil so that it can rotate or reciprocate. The seal ring case 20 is fitted into the oil box 10 so as to surround the shaft 60, and an O-ring 211 is fitted into the groove 21 and a seal ring 221 is fitted into the groove 22. A bottle 23 screwed onto the box portion 11 of 10 is engaged at a notch 24. The lipped self-lubricating seal ring 80 is a first
Consists of a ring 81 and a second ring 82, both of which are connected to the shaft 6.
The seal ring nurse 20 is fitted into the seal ring nurse 20 so as to surround the first ring B2, and the lip 811 of the first ring 81 and the lip 821 of the second ring B2 are brought into contact with the surface of the shaft 60.
Both rings overlap so that the second ring 82 presses the lip 811 of the ring 81. Holder ring with stopper 4
0 is a seal ring case 2 surrounding the shaft 60.
0, so that the stop collar 41 ( ) is locked to the stepped portion 26 of the seal ring case 20, and the tip 42 can press the lip 821 of the seal ring 8008g2 ring 82 to the circumferential surface of the shaft 60. The presser ring 40 has an O-ring 481 in the groove 48.
is fitted to seal between the seal ring case 20 and the seal ring case 20. Note that a gas nut (not shown) is installed between the stopper 41 and the stepped portion 25 instead of the O-ring 481 and the groove 48.
, or provide a groove (not shown) in the stopper 41 and fit an O-ring (not shown), or seal ring case 2.
0 is provided with a groove (not shown) and an O-ring (not shown) is fitted into the holding ring 40 and seal ring case 2.
0 may be sealed. The compression coil spring 50 is
A shaft 60 is connected between the guide ring 51 in contact with the retaining ring 40 and the side portion 111 of the box portion 11 of the oil box IO.
The presser ring 40 is interposed so as to surround it and press the presser ring 40 to the left in the figure.

When sealing oil in the oil box 10, when the shaft 60 is a rotating shaft, it is preferable to immerse the oil up to the X-X line.
When the shaft 60 is a reciprocating shaft, it is preferable to immerse it up to the Y-Y line.

Since the present invention is configured as described above, the high pressure gas that enters from between the side part 111 of the box part 11 of the oil box 1O and the shaft 60 to the left in the figure is transmitted to the presser ring 40.
and the seal ring case 20 (hereinafter referred to as the outer ring) and between the presser ring 40 and the shaft 60 (hereinafter referred to as the inner ring), but the high pressure gas in the outer ring is blocked by the O-ring 481. The high pressure gas on the inner circumference is blocked by the lip 821 of the seal ring 82. Furthermore, the seal ring 221 prevents high-pressure gas from entering toward the shaft 60 from between the oil box 10 and the seal ring case 20 . Therefore, the seal ring 80 as a whole does not receive gas pressure except for the lips 321 to 811, and therefore the seal ring 80
It was confirmed that there was less wear and tear on the seal, and gas leakage due to the lip shaft seal was much lower than that of the mechanical seal and V-ring seal IC described above. Furthermore, the device of the present invention has the advantages of a simple mechanism, low manufacturing cost, and easy handling and low cost for replacing the seal ring.

FIG. 2 shows another embodiment of the device of the present invention.

That is, the device of this example includes an oil box IOB, a seal ring case 2OB, a self-lubricating seal ring 80B with a lip, and a presser ring 40B. The oil box IOB and seal ring BOB are the oil box 10 and seal ring 8 of the apparatus of the present invention shown in FIG.
Since it is the same as 03, the explanation will be omitted. The seal ring case 2OB has a female thread 20B18 having the same structure as the seal ring case 20 of the device of the present invention shown in FIG. It has a ring shape with a mating male thread 411B and a shaft 60 fitted on the inner circumferential surface 42B.
Lip 8 of the second ring 82B of the seal ring 80B at B
When the screw 21B is gradually enlarged by the curve 2 of the shaft 60, the same effect as the device of the present invention shown in FIG. 1 can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of the invention, and FIG. 2 is a partial sectional view showing another embodiment of the invention. 10, IOB...Oil box, 20.20B...Seal ring case, 80.8OB
...Self-lubricating seal ring with lip, 811.821.811B, 821B...Lip, 4
0... Holding ring with stopper, 41... Stopper, 40B... Holding ring, 50...
... Compression fill spring, 60... Rotating shaft or reciprocating shaft. Agent Patent Attorney Ya Watanabe −

Claims (1)

[Claims] 1. A rotating shaft or a reciprocating shaft (
Hereinafter, it will simply be referred to as the axis. ) is rotatably or reciprocally inserted into the shaft sealing device, a seal ring case is fitted into the oil box so as not to rotate around the shaft, and a lip-equipped shaft seal is inserted into the seal ring case so that it does not rotate around the shaft. A lubricating seal ring is fitted so that the lip of the lubricant can be crimped onto the circumferential surface of the shaft so that the lip surrounds the curved surface of the shaft, and a seal is formed between the presser ring and the seal ring case, and the presser ring and the oil box, a compression coil spring is interposed so as to suppress the presser ring. 2.Insert the rotating shaft or reciprocating shaft (
Hereinafter, it will simply be referred to as the axis. ) is rotatably or reciprocally inserted into the oil box, a seal ring case is fitted into the oil box so as not to rotate around the shaft, and a lip-equipped shaft seal is inserted into the oil box so as not to rotate about the shaft. A lubricating seal ring is fitted nine times so that the lip surrounds the curved surface of the shaft, and a presser ring that is threadedly engaged with the seal ring case is screwed in so that the ring tip can press the lip of the seal ring to the circumferential surface of the shaft. Shida shaft sealing device featuring Shida.