JPH0791373A - Shaft sealing device of reciprocating gas compressor - Google Patents

Abstract

PURPOSE:To secure a shaft sealing device that is less in power cost in addition to long-livedness, and simple in shaft sealing work and high in reliability by inserting a tubular packing member consisting of a self-lubricative material, into the inner part of a shaft seal box surrounding a piston rod, and locking this packing tight so as not to come into contact, with the piston rod. CONSTITUTION:Tubular packing 10 is inserted into the inner part of a shaft seal box 30 surrounding a piston rod 50. By the way, this tubular packing 10 uses a self-lubricative material, and this inner circumferential surface 11 is set to an inner diameter slightly larger than an outer diameter of this piston rod 50, while an outer circumferential surface 12 is formed into being fittable in the shaft seal box 30. In succession, this tubular packing 10 is locked with, for example, a gland presser 40 so as not contact with reciprocating motion of the piston rod 50. With this constitution, a problem on wear in the tubular packing 10 is solved and service life and reliability are improved, through which the decrement of sliding resistance and power loss as well as pollution control over a shaft sealing part due to abrasion power are achieved and simultaneously manufacture of this tubular packing 19 is made inexpensive in cost and setting it into the shaft seal box is simplified respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft seal device for a reciprocating gas compressor.

[0002]

2. Description of the Related Art The above-mentioned conventional shaft seal device is disclosed in Japanese Utility Model Publication No. 55-3.
As shown in FIGS. 1 to 4 of Japanese Patent Publication No. 9889,
After assembling the three-piece type gland packing 2 and the six-piece type gland packing 3 as a set, tighten the garter springs 4 so that they are pressed against the outer circumference of the piston rod 5 and store them in the packing case 6 and finally gland. The shaft was sealed by pressing it with a presser foot to prevent gas leakage from the cylinder side, but since it is tightened with a garter spring,
The inner surface of the gland packing is heavily worn and has a short life, the piston pad is pressed by the gland packing to increase the power cost, it takes a long time to seal the shaft by assembling the gland packing, the manufacturing cost of the gland packing is high, and the wear However, there were some drawbacks such as the maintenance and maintenance of the ground packing that took time and effort.

[0003]

SUMMARY OF THE INVENTION The present invention provides a shaft seal device for a reciprocating gas compressor which has a long life and is inexpensive, requires less power cost, can be shaft sealed easily and in a short time, and has high reliability. Is provided.

[0004]

In order to achieve the above object, the shaft seal device for a reciprocating gas compressor according to the present invention has a shaft seal box 30 surrounding a piston rod 50, as shown in the drawing.
It has an inner peripheral surface 11 having an inner diameter slightly larger than the outer diameter of the piston rod 50, and has an outer peripheral surface 12 on the shaft sealing box 3
Cylindrical packing 10 made of self-lubricating material that can be fitted inside
And the cylindrical packing 10 is fixed so as not to come into contact with the reciprocating movement of the piston rod 50.

In order to achieve the above object, the shaft sealing device of the reciprocating gas compressor according to the present invention has a shaft sealing box 30B surrounding the piston rod 50B with a diameter slightly smaller than the outer diameter of the piston rod 50B. Is made of a self-lubricating material that has an inner peripheral surface 11B with a large inner diameter, surrounds one or a plurality of circumferential grooves 13B in the inner peripheral surface 11B, and can fit the outer peripheral surface 12B into the shaft sealing box 30B. The cylindrical packing 10B is inserted, and the cylindrical packing 10B is fixed so as not to come into contact with the reciprocating movement of the piston rod 50B.

In the present invention, the tubular packing 10 or 1
OB is a self-lubricating material mainly composed of carbon or tetrafluoroethylene resin. Also, the tubular packing 10 or 1
In 0B, one or a plurality of circumferential grooves 13B can be provided on the inner peripheral surface in order to prevent gas leakage and absorb expansion when a resin material or the like is used.

[0007]

Embodiment 1 An embodiment of the present invention is shown in FIG.

The tubular packing 10 is mainly made of a carbonaceous self-lubricating material, and the inner peripheral surface 11 has an inner diameter slightly larger than the outer diameter of the piston rod 50, and the outer peripheral surface 12
Are formed so that they can be fitted into the shaft sealing box 30. Further, the tubular packing 10 can be fixed by a gland presser 40 so as not to come into contact with the reciprocating movement of the piston rod 50.

[0009]

Embodiment 2 An embodiment of the present invention is shown in FIG.

The cylindrical packing 10B is mainly composed of a self-lubricating material of tetrafluoroethylene resin, and has an inner peripheral surface 11B.
Has an inner diameter slightly larger than the outer diameter of the piston rod 50B and surrounds the three circumferential grooves 13B. The outer peripheral surface 12B is formed so that it can be fitted into the shaft sealing box 30B. In addition, the tubular packing 10B is provided with a gland presser 4
By 0B, the piston rod 50B can be fixed so as not to come into contact with the reciprocating movement of the rod 50B.

[0011]

Therefore, after the tubular packing 10 or 10B is fitted in the shaft sealing box 30 or 30B along the piston rod 50 or 50B, the gland presser 40 or 40B is used to connect the cylinder packing 20 or 20B to the cylinder wall 20 or 20B. Cylinder (not shown) during operation if tightened so that the packing 10 or 10B does not contact the piston rod 50 or 50B.
The compressed gas inside leaks slightly from the slight gap between the cylindrical packing 10 or 10B and the piston rod 50 or 50B, but due to the reciprocating movement of the piston (not shown), the gas leak takes a considerable amount of time. Particularly, when the circumferential groove 13B is provided, it takes more time.

[0012]

According to the present invention, since the cylindrical packing does not wear because it does not contact the piston rod, long life and reliability of the packing are guaranteed, and the sliding resistance is not contacting with the piston rod. No, it requires less power,
Furthermore, since it does not contact the piston rod, it does not generate wear powder of the packing material and contaminates the shaft sealing portion as in the conventional case.It is extremely easy to mount or remove the cylindrical packing in the shaft sealing box. It has the advantages that it can be completed in a short time, and that the tubular packing can be manufactured easily and at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

[Explanation of sign]

 10, 10B Cylindrical packing 11, 11B Inner peripheral surface 12, 12B Outer peripheral surface 13B Circumferential groove 30, 30B Shaft sealing box 50, 50B Piston rod

Claims (2)

[Claims] 1. A shaft seal box 3 surrounding a piston rod 50.
0 has an inner peripheral surface 11 having an inner diameter slightly larger than the outer diameter of the piston rod 50, and a cylindrical packing 10 made of a self-lubricating material capable of fitting the outer peripheral surface 12 into the shaft sealing box 30 is inserted. A shaft seal device for a reciprocating gas compressor, wherein the cylindrical packing 10 is fixed so as not to come into contact with the reciprocating motion of the piston rod 50. 2. A shaft sealing box 30B surrounding the piston rod 50B has an inner peripheral surface 11B having an inner diameter slightly larger than the outer diameter of the piston rod 50B and the inner peripheral surface 1B.
1B surrounds one or a plurality of circumferential grooves 13B, and the outer peripheral surface 12B is inserted with a cylindrical packing 10B made of a self-lubricating material which can be fitted in the shaft sealing box 30B. A shaft sealing device for a reciprocating gas compressor, which is fixed so as not to come into contact with the reciprocating motion of the piston rod 50B.