JPH0126429B2 - - Google Patents

Description

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

Conventionally, balanced mechanical seals and devices such as those shown in Japanese Patent Publication No. 14762/1983 have been used as shaft seal devices to prevent this type of high-pressure gas leakage, but the former is limited to rotating shafts and is However, there are drawbacks such as a complicated mechanism and high production costs, time-consuming installation and removal, and high costs for fitting replacement sealing materials.The latter is limited to reciprocating shafts, and sealing materials (hereinafter referred to as V-rings) are required. ) had the disadvantage of being subject to heavy wear and tear due to the large pressure receiving area due to gas pressure.

Therefore, the inventor of the present invention proposed that the shaft can be sealed using a self-lubricating seal ring with a lip provided with a through hole.
We have discovered that gas leakage is extremely reduced, making it suitable for sealing either rotating shafts or reciprocating shafts, and that the through holes extend the life of the seal ring. Successful.

That is, the present invention provides a rotary shaft or a reciprocating shaft (hereinafter simply referred to as a shaft) in an oil-sealed oil box.
A shaft seal device in which a seal ring case is inserted into the oil box so as to be rotatably or reciprocally movable, and a seal ring case is fitted into the oil box so as not to rotate around the shaft,
A self-lubricating seal ring with a lip provided with a through hole is inserted into the seal ring case so that the inner circumferential side of the lip surrounds the circumferential surface of the shaft, and the inner circumferential side of the lip is further inner than the through hole in the downstream side. crimping the side portions, and fitting a retainer ring with a stopper in such a way that the stopper engages the seal ring case and the ring tip presses the inner peripheral side portion of the lip of the seal ring against the shaft peripheral surface; A shaft sealing device that seals between the retaining ring and the seal ring case, and interposing a compression coil spring between the retaining ring and the oil box so as to press the retaining ring, and an oil-sealing device. 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 a box, and a seal ring case is rotated around the shaft within the oil box. Insert the seal ring into the case so that it does not
A self-lubricating seal ring with a lip provided with a through hole is fitted so that the inner circumferential side of the lip surrounds the circumferential surface of the shaft, so that the downstream portion inner circumferential side of the through hole can be crimped. In addition, there is provided a shaft sealing device in which a retainer ring that is screwed into the seal ring case is screwed into the retainer ring so that the tip of the ring can press the inner peripheral side of the lip of the seal ring against the shaft peripheral surface. .

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

The shaft sealing device of the present invention comprises an oil box 10, a seal ring case 20, a self-lubricating seal ring 30 with a lip, a retaining ring 40 with a stopper, and a compression coil spring 50. The oil box 10 has a box part 11 and a presser lid part 12, and an inserted rotating shaft or reciprocating shaft 60 is oil-sealed so as to be rotatable or reciprocatable. The seal ring case 20 is fitted into the oil box 10 so as to surround the shaft 60, and the O-ring 21 is inserted into the groove 21.
1. Fit the seal ring 221 into the groove 22 and the O-ring 231 into the groove 23, and engage the pin 23 screwed into the box part 11 of the oil box 10 at the notch 24 so as not to rotate around the shaft 60. are doing. The self-lubricating seal ring 30 with a lip consists of a first ring 31 provided with a through hole 310 and a second ring 32 provided with a through hole 320, both of which are fitted into the seal ring case 20 so as to surround the shaft 60. Then, the inner peripheral part 311 of the lip of the first ring 31 and the inner peripheral part 321 of the lip of the second ring 32 are brought into contact so as to surround the peripheral surface of the shaft 60, and the lip 311 of the first ring 31 is brought into contact with the inner peripheral part 321 of the lip of the second ring 32. The downstream part 3 of the first ring 31 is overlapped so that the second ring 32 can be pressed.
Inner peripheral side portion 3 inside the through hole 310 of No. 12
121 can be crimped onto an O-ring 231 fitted into the groove 23 of the seal ring case 20. The retaining ring 40 with a stopper is fitted into the seal ring case 20 so as to surround the shaft 60, and the stopper 41 is engaged with the stepped portion 25 of the seal ring case 20, and the tip 42 is attached to the second ring 32 of the seal ring 30. The lip 321 of the shaft 60
so that it can be pressed against the circumferential surface of the The compression coil spring 50 is interposed between the guide ring 51 in contact with the presser ring 40 and the side portion 111 of the box portion 11 of the oil box 10 so as to surround the shaft 60, and presses the presser ring 40 to the left in the figure. ing.

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

Since the present invention is configured as described above,
Side portion 11 of box portion 11 of oil box 10
The high-pressure gas leaking from between 1 and the shaft 60 to the left in the figure is caused by the presser ring 40 and the seal ring case 20.
It enters between the seal ring 30 and the seal ring case 20 and into the through holes 310 and 320 of the seal ring 30 from between the presser ring 40 and the shaft 60 between the O-ring 231 and the seal ring 32.
is blocked by the inner circumferential portion 321 of the lip. Furthermore, high-pressure gas attempting to enter toward the shaft 60 from between the oil box 10 and the seal ring case 20 is blocked by the seal ring 221. Through holes 320 and 3 of seal ring 30
10, the gas pressure that enters to the left in the figure acts as a pushing force on the ring downstream parts 322 and 312 (excluding the inner peripheral part 3121), and presses the ring upstream parts 323 and 313 to deform the whole. (Self-tightening effect) Since the gas pressure that is to be applied to the lip is canceled out by excluding the inner circumferential portions 321 and 311 of the lip, the gas pressure acts only on the inner circumferential portions 321 and 311 of the lip. First, since the seal ring as a whole is only subjected to self-tightening action that is sufficient to stop gas leakage, its wear and tear is extremely small. Furthermore, it was confirmed that gas leakage due to the lip shaft seal was much lower than that with the mechanical seal or V-ring seal 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 has an oil box 10B.
It consists of a seal ring case 20B, a self-lubricating seal ring 30B with a lip, and a retaining ring 40B. The oil box 10B and seal ring 30B are the same as the oil box 10 and seal ring 30 of the apparatus of the present invention shown in FIG. 1, so a description thereof will be omitted. The seal ring case 20B has a female thread 2031B threaded on a part of its inner circumferential surface 203B, and has the same structure as the seal ring case 20 of the apparatus of the present invention shown in FIG. Omitted. The holding ring 40B has a seal ring case 2 on the outer peripheral surface 41B.
Male thread 411 screwed into 0B female thread 2031B
It is a ring-shaped item with a thread B and a shaft 60B fitted on the inner circumferential surface 42B, and the seal ring 3 is attached at the tip 43B.
The lip 321B of the second ring 32B of 0B is attached to the shaft 6.
It is designed so that it can be crimped onto the circumferential surface of 0B.

Therefore, when the presser ring 40B is screwed into the seal ring case 20B, the same effect as the device of the present invention shown in FIG. 1 can be obtained.

[Brief explanation of drawings]

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. 10,10B...Oil box, 20,20
B...Seal ring case, 30, 30B...Self-lubricating seal ring with lip, 310, 32
0,310B,320B...Through hole, 311,3
21, 311B, 321B... Inner peripheral side portion of lip, 312, 322, 312B, 322B... Downstream side portion of seal ring, 3121, 3121B...
...Inner peripheral side part of the downstream part, 40... Presser ring with stopper, 41... Stopper, 40B
... Presser ring, 50 ... Compression coil spring, 6
0,60B...Rotating axis or reciprocating axis.

Claims (1)

[Scope of Claims] 1. A shaft sealing device in which a rotary shaft or a reciprocating shaft (hereinafter simply referred to as a shaft) is rotatably or reciprocally inserted into an oil-sealed oil box, which comprises: A seal ring case is fitted so as not to rotate around the shaft, and a self-lubricating seal ring with a lip provided with a through hole is inserted into the seal ring case so that the inner circumferential side of the lip touches the circumferential surface of the shaft. The presser ring is fitted in such a way that it surrounds the through hole so that the inner peripheral side of the through hole in the downstream side can be crimped, and the stopper engages the seal ring case so that the tip of the ring is attached to the seal ring. The inner circumferential portion of the lip is fitted so as to be pressed against the circumferential surface of the shaft, and a compression coil spring is interposed between the retainer ring and the oil box so as to be able to press the retainer ring. Shaft sealing device. 2. A shaft sealing device in which a rotary 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, wherein a seal ring case is inserted into the oil box and the shaft is A self-lubricating seal ring with a lip provided with a through hole is fitted into the seal ring case so as not to rotate around the shaft, and a self-lubricating seal ring with a lip provided with a through hole is fitted into the seal ring case so that an inner circumferential portion of the lip surrounds the circumferential surface of the shaft. The inner circumferential side of the downstream portion of the through-hole can be crimped, and a retaining ring that is threadedly engaged with the seal ring case is attached so that the tip of the ring presses the inner circumferential side of the ripple of the seal ring onto the shaft circumferential surface. A shaft sealing device characterized by being screwed in so that it can be pressed.