JPS6224077A - Sealing liquid temperature holding type shaft sealing device - Google Patents

Abstract

PURPOSE:To prevent a sealing liquid from being deteriorated by arranging an operating fluid flow system for temperature adjustment to keep the sealing liquid at an adequate temperature regardless of the temperature of the machine inner side on a sealing cover fitted adjacently to the machine inner side of a mechanical seal. CONSTITUTION:An operating fluid flow path 22 as an operating fluid flow system for temperature adjustment to keep a sealing liquid at an adequate temperature is formed on a sealing cover 17 at the penetration section of the rotary shaft 18 of the sealing cover 17 along the outer periphery of this rotary shaft 18, and many fins 27 to improve cooling/heating effects are formed on the inner periphery of the sealing cover 17 facing the rotary shaft 18 at the penetration section. Accordingly, the sealing liquid having leaked into a sealing section 25 on the machine inner side can be kept at an adequate temperature regardless of the temperature of the machine inner side, thus the sealing liquid can be prevented from being deteriorated or solidified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shaft sealing device used in a rotating machine such as a turbine.
To war xI+1? -:,n,+dim;lit^1nap
This invention relates to a sealing liquid temperature-maintaining shaft sealing device that uses matrices 4-7 and 2.

[Conventional technology]

Conventionally, the rotation of a turbine, etc. is 8! As a shaft sealing device used in a machine, there is one as shown in Fig. 2, in which the rotating shaft 18 of the rotating machine is connected to the interior 11123 of the machine and the atmosphere side 24.
A mechanical seal 19 that seals the inside of the machine 1111123 from the atmosphere side is provided at a portion that penetrates the wall of the casing 15 that partitions the machine.

In this mechanical seal 19, a mating ring 2 is fixed to the outer periphery of the rotating shaft 18, and seal rings 3 and 9 are arranged so as to contact the mating ring 2 from the inside 23 and the atmosphere side 24, respectively. has been done.

The seal ring 3 is connected to one end of a bellows 5 via a retainer 4, and is urged toward the remating ring 2 by the bellows 5. In addition, the other end of the bellows 5 is
The outer periphery of the rotating shaft 18 is fixed to the case 7 with an adapter 6, and the case 7 is attached to the casing 15 with bolts 8 from the inside 23 of the machine.

Further, the seal ring 91 is biased toward the mating ring 2 side by the coil spring 12 via the retainer 10. The coil spring 12 is connected to the rotating shaft 1
8, the case 1 is attached to the casing 15 by the retainer 10 and the bolts 14 from the atmospheric side 24.
In addition to being interposed between the retainer 10 and the case 13, an O-ring 11 is interposed between the retainer 10 and the case 13.

Furthermore, in the interior 23 of the machine, a (
A seal cover 17 is attached to the casing 15 adjacent to the mechanical seal 19.

On the other hand, in the wall of the casing 15, there is a seal liquid supply passage 20 as a seal liquid supply system for supplying seal liquid to the sliding part between the mating ring 2 and the seal ring 3.9 in the seal part 26. In addition, the seal cover 17 has a mating ring 2 and a seal ring 3.
A seal liquid discharge passage 21 is formed as a seal liquid discharge system for discharging the seal liquid leaked from the sliding portion to the inside seal portion 25.

A sleeve 16 is attached to the outer periphery of the rotating shaft 18 via an O-ring 1 on a side 24 closer to the atmosphere than the mating ring 2 to prevent corrosion and wear of the rotating shaft 18.

When such a shaft 1 is used in a device, its mechanical seal 19
Seal liquid is supplied into the seal portion 26 through the seal liquid supply path 20 from a seal liquid tank (not shown). This lubricates the sliding portion of the mechanical seal 19, that is, the sliding portion between the mating ring 2 and the seal rings 3 and 9.

By the way, the gas pressure inside the machine 23 is p. (kgf/cω2
), the gas pressure inside the in-machine seal part 25 is p+(kgf/c
m2), and the seal fluid pressure in the seal part 26 is set to p2 (kgf/
am2), the gas pressure in the atmosphere @24 is p: + (kgf/c
m2), the following equation holds for the opening of poyp+t1)21p3.

po≧p+ (1) p
, =p, +I) [0,5≦p≦1.5(kgf/
am2)] (Z)pz < 112
(3) As shown in equation (2),
Since the gas pressure p in the inside seal part 25 is smaller than the seal liquid pressure ρ2 in the seal part 26 by about 1 kgf/c112, there is no gas from the sliding part between the mating ring 2 and the seal ring 3 to the inside seal part 25. Although the sealing liquid leaks, this sealing liquid passes through the sealing liquid discharge path 21 and is discharged to an external tank (not shown) or the like.

・Although the sealing liquid also leaks from the sliding part between the mating ring 2 and the seal ring 9 to the atmosphere side 24, the biasing force of the coil spring 12 is considerably larger than that of the bellows 5, so that the mating ring 2 and the seal ring Since the sealing liquid and the sealing liquid 9 slide on each other while being in close contact with each other, the amount of sealing liquid that leaks is extremely small.

[Problem that the invention seeks to solve]

However, in the conventional shaft sealing device as described above, the gas temperature inside the machine 23 fluctuates widely (from -50°C to -200°C).
It can be extremely low temperatures (°C) or extremely high temperatures. Therefore, the sealing fluid leaked to the inside sealing part 25 is also affected by the gas temperature inside the machine 23, and its action as a sealing liquid may deteriorate, and the sliding part between the mating ring 2 and the sealing ring 3 may be lubricated. There are problems such as defects.

Furthermore, when the gas temperature inside the machine side 23 decreases, there is also the problem that the sealing liquid leaking inside the machine side seal part 25 solidifies.

The present invention attempts to solve these problems, α, by making it possible to maintain the sealing liquid at an appropriate temperature regardless of the temperature inside the machine, thereby preventing deterioration or solidification of the sealing liquid or sliding of the mechanical seal. This prevents poor lubrication in the
An object of the present invention is to provide a shaft sealing device that maintains the temperature of a sealing liquid.

[Means for solving problems]

For this reason, the sealing liquid temperature-maintaining shaft sealing device of the present invention has a structure in which the rotating shaft of a rotating machine passes through the casing wall that partitions the inside of the machine from the outside. In addition to being equipped with a mechanical seal,
The same mechanical seal! 1iThe seal cover is equipped with a seal liquid supply system to the IJ part and a seal liquid discharge system for discharging the seal liquid via the sliding part, and is mounted adjacent to the inside of the machine of the mechanical seal, Regardless of the temperature inside the machine, a temperature-adjusting working fluid distribution system has been installed to maintain the sealing liquid at an appropriate temperatureff.
It is a sign.

[For production]

In the above-described seal liquid temperature maintenance device of the present invention, the seal liquid is always maintained at an appropriate temperature regardless of the temperature inside the machine by the temperature adjusting working fluid distribution system.

〔Example〕

Hereinafter, a sealing liquid temperature maintaining type shaft sealing device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof.

The sealing liquid temperature-maintaining shaft sealing device of this embodiment is constructed almost the same as the conventional shaft sealing device, and as shown in FIG.
The rotating shaft 18 of a rotating machine such as a turbine penetrates the wall of the casing 15 that partitions the inside 23 of the machine and the atmosphere side 24 of the same rotating machine, and the inside 23 is closed from the hot side 24.
It is equipped with a mechanical seal 19.

(7) In the mechanical seal 19, the mating ring 2 is fixed to the outer periphery of the rotating shaft 18, and
Seal rings 3 and 9 are disposed so as to abut on the mating ring 2 from the inside 23 and the atmosphere side 24, respectively.

The seal ring 3 is connected to one end of a bellows 5 via a retainer 4, and is urged toward the remating ring 2 by the bellows 5. The other end of the bellows 5 is fixed to the case 7 by a pin 6 on the outer periphery of the rotating shaft 18, and the case 7 is attached to the casing 15 with bolts 8 from the inside 23 of the machine.

Furthermore, the seal ring 9 is biased toward the mating ring 2 by a coil spring 12 via a retainer 10 . The coil spring 12 is connected to the rotating shaft 18
At the outer periphery, a retainer 10 and a case 13 are attached to the casing 15 by bolts 14 from the atmospheric side 24.
An O-ring 11 is interposed between the retainer 10 and the case 13.

Further, on the inside 23 of the machine, a seal cover 17 is attached to the casing 15 adjacent to the mechanical seal 19 so as to cover the case 7 .

On the other hand, in the wall of the casing 15, there is a seal liquid supply passage 20 as a seal liquid supply system for supplying seal liquid to the sliding part between the mating ring 2 and the seal ring 3.9 in the seal part 26. In addition, the seal cover 17 has a mating ring 2 and a seal ring 3.
A seal liquid discharge path 21 is formed as a seal liquid discharge system for discharging the seal liquid leaked from the sliding portion to the inside seal portion 25.

Further, in the seal cover 17, a working fluid flow passage 22 as a working fluid flow system for temperature adjustment for maintaining the sealing liquid at an appropriate temperature is provided through the rotary shaft 18 of the seal cover 17.
T! In one part, the seal cover 17 is formed along the outer periphery of the rotating shaft 18, and on the inner peripheral surface of the seal cover 17, which faces the rotating shaft 18 in the penetrating portion, there are fins 27 for improving the cooling and heating effect. Many are formed.

A sleeve 16 is attached to the outer periphery of the rotating shaft 18 at a side 24 closer to the atmosphere than the mating ring 2 via an O-ring 1 to prevent corrosion and wear of the rotating shaft (8).

Since the seal liquid temperature-maintaining shaft seal device as an embodiment of the present invention is configured as described above, the seal liquid is supplied from the seal liquid tank (not shown) into the seal portion 26 of the mechanical seal 19, as in the conventional device. Seal liquid is supplied through the liquid supply path 20. At this time, the sliding portion of the mechanical seal 19, that is, the sliding portion between the mating ring 2 and the seal rings 3 and 9, is lubricated.

By the way, since the gas pressure p1 in the inside seal part 25 is smaller than the seal liquid pressure p in the seal part 26 by about 1 kHz/cm2 [see equation (2) 1, the relationship between the mating ring 2 and the seal ring 3] Seal liquid leaks from the sliding part to the inside seal part 25, but this seal liquid leaks into the seal liquid discharge path 2.
1 and is discharged to an external tank (not shown) or the like.

Note that the sealing liquid also leaks from the sliding part between the mating ring 2 and the seal ring 9 to the atmosphere side 24, but the biasing force of the coil spring 12 is considerably larger than that of the bellows 5. The sealing liquid slides against each other while being in close contact with each other, so the amount of sealing liquid that leaks is extremely small.

In the apparatus of this embodiment, when the gas inside the machine inside 23 is at an extremely low temperature, the sealing liquid leaked into the inside seal part 25 is circulated through the temperature adjustment working fluid flow path 22 by circulating the heated fluid. On the other hand, when the gas inside the machine inside 23 is at a high temperature, the sealing liquid leaked into the inside seal part 25 is cooled by circulating cooling fluid through the temperature adjusting working fluid flow path 22.

In this way, regardless of the temperature of the inside 23 of the machine, the sealing liquid leaked into the inside seal 25 can be maintained at an appropriate temperature, so that deterioration and assimilation of the sealing liquid can be prevented, and the mechanical seal 19 It is now possible to prevent poor lubrication of the sliding parts between the mating ring 2 and the seal ring 3, and the original function of the mechanical seal 19 can be improved.
Demonstrated in minutes? It is possible.

〔Effect of the invention〕

As described in detail above, according to the sealing liquid temperature-maintaining shaft sealing device of the present invention, during rotation 1 of a rotating machine, the shaft passes through the casing wall that partitions the inside and outside of the rotating machine. , is equipped with a mechanical seal that seals the inside of the machine from the outside, a seal liquid supply system to the sliding part of the mechanical seal, and a seal liquid discharge system for discharging the seal liquid via the sliding part. and a seal cover installed adjacent to the inside of the machine of the mechanical seal,
Regardless of the temperature inside the machine, a temperature-adjusting working fluid distribution system is installed to maintain the seal liquid at an appropriate temperature.This simple Y1 rule prevents deterioration or solidification of the seal liquid, or fH+ of mechanical seals. This makes it possible to prevent poor lubrication in the parts, thereby maintaining sufficient airtightness between the inside and outside of the machine, which has the advantage of allowing the mechanical seal to effectively perform its original function.

[Brief explanation of the drawing]

! Figure S1 is a vertical cross-sectional view showing a sealing liquid temperature-maintaining type shaft sealing device as an embodiment of the present invention, and Figure P52 is a vertical cross-sectional view showing a conventional shaft sealing device. 1. O-ring, 2. Mating ring, 3. Seal ring, 4. Retainer, 5. Bellows, 6.
Adapter, 7.Case, 8.Bolt, 9.Seal ring, 10.Retainer, 11.0 ring, 12
...Coil spring, 13..Case, 14..Bolt, 15..Casing, 16..Sleeve, 17..
Seal cover, 18...Rotating shaft, 19...Mechanical seal, 20...Seal liquid supply path as a seal liquid supply system, 21...Seal liquid discharge path as a seal liquid discharge system, 2
2. Working fluid flow path as a working fluid distribution system for temperature adjustment, 23. Inside the machine, 24... Atmosphere side, 25... Inside seal part, 26... Seal part, 27... Fin. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 1 Figure 2

Claims (1)

[Claims] A mechanical seal that seals the inside of the machine from the outside is provided at the part where the rotating shaft of the rotating machine passes through the casing wall that partitions the inside and outside of the machine, and a mechanical seal that seals the inside of the machine from the outside. seal liquid supply system,
A sealing liquid discharge system is provided for discharging the sealing liquid via the sliding part, and a seal cover installed adjacent to the inside of the machine of the mechanical seal is provided with a sealing liquid discharge system for discharging the sealing liquid via the sliding part. A sealing liquid temperature maintenance type shaft sealing device, characterized in that a working fluid circulation system for temperature adjustment is provided to maintain the sealing liquid at an appropriate temperature.