JPS6323425B2 - - 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 present invention proposes 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. They also discovered that it is suitable for sealing either a rotating shaft or a reciprocating shaft, and succeeded in developing the shaft sealing device of the present invention.

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 is fitted into the seal ring case so that the lip surrounds the circumferential surface of the shaft, and a retaining ring with a stopper is fitted into the seal ring case so that the stopper engages the seal ring case and presses the ring tip. is fitted so that the lip of the seal ring can be crimped onto the circumferential surface of the shaft, a seal is formed between the retaining ring and the seal ring case, and a compression coil spring is inserted between the retaining ring and the oil box. A shaft sealing device interposed to press the retaining ring, and
This 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 a seal ring case is inserted into the oil box to rotate around the shaft. a self-lubricating seal ring with a lip is fitted into the seal ring case so that the lip does not rotate, and the lip surrounds the peripheral surface of the shaft;
A shaft sealing device is provided in which a retaining ring that is screwed into the seal ring case is screwed into the ring so that the ring tip can press the lip of the seal ring to 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 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. A seal ring 221 is fitted into the groove 22, and a pin 23 screwed onto the box portion 11 of the oil box 10 is engaged at the notch 24 so as not to rotate around the shaft 60. The self-lubricating seal ring 30 with a lip consists of a first ring 31 and a second ring 32, both of which are fitted into the seal ring case 20 so as to surround the shaft 60.
Lip 311 of first ring 31 and second ring 32
The lip 321 of the first ring 31 is brought into contact with the circumferential surface of the shaft 60, and the second ring 32 presses the lip 311 of the first ring 31 so that they overlap. 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 inserted into the step 25 of the seal ring case 20.
and the seal ring 30 at the tip 42.
The lip 321 of the second ring 32 can be pressed onto the circumferential surface of the shaft 60. Furthermore, an O-ring 431 is fitted into the groove 43 of the presser ring 40 to provide a seal between the presser ring 40 and the seal ring case 20.
Note that instead of the O-ring 431 and the groove 43, a gasket (not shown) may be provided between the stopper 41 and the stepped portion 25, or a groove (not shown) may be provided in the stopper 41 and the O-ring (not shown) may be fitted therein. Alternatively, a groove (not shown) may be provided in the seal ring case 20 and an O-ring (not shown) may be fitted thereinto to seal between the presser ring 40 and the seal ring case 20. 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.
(hereinafter referred to as the outer circumference) and between the presser ring 40 and the shaft 60 (hereinafter referred to as the inner circumference).
However, the high pressure gas on the outer circumference is blocked by the O-ring 431, and the high pressure gas on the inner circumference is blocked by the lip 321 of the seal ring 32. 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. Therefore, the seal ring 30 has a lip 3.
Except for 21 to 311, the seal ring 30 is not subjected to gas pressure as a whole, so there is less wear and tear on the seal ring 30, and gas leakage due to the lip shaft seal is much smaller than the aforementioned mechanical seal or V-ring seal. This was confirmed. 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 case 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 retainer ring 40B has a male thread 4 on the outer peripheral surface 41B that is screwed into the female thread 2031B of the seal ring case 20.
11B is threaded, and the shaft 60 is fitted onto the inner peripheral surface 42B in a ring shape, so that the lip 321B of the second ring 32B of the seal ring 30B can be crimped onto the peripheral surface of the shaft 60 at the tip 43B. .

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 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. 10,10B...Oil box, 20,20
B...Seal ring case, 30, 30B...Self-lubricating seal ring with lip, 311, 32
1,311B,321B...Rip, 40...Press ring with stopper, 41...Stopper, 40
B... Presser ring, 50... Compression coil spring, 6
0...Rotating axis or reciprocating axis.

Claims (1)

[Scope of Claims] 1. 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, wherein the oil box has a seal A ring case is fitted so as not to rotate around the shaft, and a self-lubricating seal ring with a lip is fitted into the seal ring case so that the lip surrounds the circumferential surface of the shaft, and a retaining ring with a stopper is fitted. The stopper is engaged with the seal ring case, and the ring tip is inserted so that the lip of the seal ring can be pressed against the circumferential surface of the shaft, thereby sealing between the presser ring and the seal ring case, and A shaft sealing device characterized in that a compression coil spring is interposed between a presser ring and the oil box so as to press the presser ring. 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 presser ring that is fitted into the seal ring case so that it does not rotate, a self-lubricating seal ring with a lip is fitted into the seal ring case so that the lip surrounds the circumferential surface of the shaft, and is screwed into the seal ring case; A shaft sealing device characterized in that a ring tip is screwed into the lip of the seal ring so as to press the lip of the seal ring onto the shaft peripheral surface.