JPS6092412A - Shaft sealing device - Google Patents

Abstract

PURPOSE:To extend the life of a sealing material and to decrease driving force of a shaft by enclosing the sealing material disposed on the outside circumferential part of the shaft by an elastic tube to retain axially the sealing material and providing a means for supplying a pressure fluid to the inside of the tube. CONSTITUTION:A sealing material 29 and an elastic tube 17 are annularly disposed between an oscillating shaft 9 and a seal case 27 of a blast furnace device, etc. A pressure fluid source 25 is connected to the tube 17 and the fluid kept under adequate pressure is conducted via a regulating valve 23 to the tube 17 to pressurize the material 29 disposed on the outside circumference of the shaft 9. A sealing material retainer 18 and a sealing material retainer 28 in common use as a greasing ring are slid in grooves 19, 20. The material 29 in then press-fitted under the adequate pressure to the shaft 9 by the pressure fluid of a pressure fluid working part 26 in the tube 17 by which the high pressure gas in the furnace inside is sealed so as not to leak to the atm. side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shaft seal device, which can be used in a wide range of applications, but is particularly suitable as a shaft seal device for S4 blast furnaces in high temperature, high pressure, and many duct locations. be.

To explain this with reference to FIG. 1, the swing shaft 9 that drives the distribution chute 3 is connected to the furnace body. 1 is supported by a drive device 10 on a deck 11 fixed to the outside of the deck 1. And because the temperature inside the furnace is high.

A difference occurs between the dimension H to the center of the hole 13 on the casing 2 side through which the swing shaft 9 passes and the dimension H' to the center 12 of the swing shaft 9 of the drive device 10 due to a difference in thermal expansion. Moreover, the amount of this difference in size changes depending on the temperature difference between the inside of the furnace and the outside air. Therefore, in order to absorb this difference, the telescopic tube 4
is provided. Since this expandable tube 4 must withstand the high temperature and high pressure gas inside the furnace, it is expensive and has a large length dimension A. In other words, the expandable tube 4 is easy to expand and contract in the axial direction, but is difficult to bend in the direction perpendicular to the axis. There is a problem that the dimension to the center of 10 is large and loose.

Further, the sealing device 5 includes a seal case 15, a sealing material presser 6, a greasing ring 7, a granite sealing material 8, etc., but the sealing material 8 is only held down by the sealing material presser 6. Therefore, multiple stages (6 stages in Figure 1)
Even though the sealant 8 is used in The number is small, therefore, the sealing material 8
The wear of the sealing material 8 is large, and the sealing material 8 must be retightened frequently by pressing the sealing material, making maintenance troublesome. Further, adjusting the force for tightening the seal member 8 is extremely troublesome, and due to fear of gas leakage, the seal member 8 may be overtightened, significantly shortening the life of the seal member 8. In addition, excessive tightening will cause the seal system 8 and the swing shaft 9 to
There is also the problem that the frictional force between the drive unit 10 and the drive unit 10 increases, and the power consumption of the drive device 10 increases.

According to the present invention, there is no need to provide an expensive telescopic tube, and the sealing material in all stages works effectively.

It is possible to prevent overpressure of the seal paulownia and extend the life of the seal material, while at the same time reducing the shaft driving force.Furthermore, even if the seal material wears out, there is no need to retighten it like in the past. It is an object of the present invention to provide a shaft sealing device that eliminates the need for labor and effort.

For this reason, the configuration of the shaft seal device of the present invention is as follows.

A sealing material disposed on the outer periphery of the shaft, an elastic tube provided outside the sealing material and surrounding the sealing material, a seal case surrounding the elastic tube, and a sealing material disposed in the axial direction. The present invention is characterized in that it includes a sealing material presser disposed inside the sealing case so as to be movable in the radial direction of the sealing case while holding down the sealing material, and a device for supplying pressurized fluid into the elastic tube.

Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 2 to 5.

FIGS. 2 and 3 show an embodiment of the present invention. In FIG. 2, 2, 9, and 13 indicate the aforementioned casing, swing shaft, and hole, respectively. In the same figure, 16 is a sealing device 4, 17 is an elastic tube made of rubber or the like, 18 is a sealing material holder, 19 and 20 are circular grooves, 21 is a bolt, 22 is a greasing hole, and 26 is a pressure regulating valve. , 24 is a gate valve, 2S is a pressure fluid source, 26 is a pressure fluid operating portion of the elastic tube 17, 27 is a sole case,
28 is a sealing material holder that also serves as a greasing ring; 29 is a sealing material such as a gland packing; 30 is a center line of the hole 13;
1 is a water supply hole, 32 is a beam 1 is a water hole, and 33 is a jacket.

Note that the center line 60 is also the center line of the seal case 27. Further, FIG. 6 is a cross-sectional view taken along the cutting line X-X in FIG. .

That is, between the swing shaft 9 and the seal case 27, there is a seal 4A29 and an elastic tube 17 outside the seal material 29.
are arranged in a ring shape as shown in FIG. 3, the pressure fluid source 25 and the elastic tube 17 are connected, and the pressure fluid source 25
The pressure fluid is adjusted to an appropriate pressure by a pressure regulating valve 23 and guided to the elastic tube 17 to pressurize a sealing material 29 disposed around the outer periphery of the swing shaft 9. Also, a sealing material holder 18 and a sealing material holder 2 which also serves as a greasing ring.
8 is disk-shaped and can slide only in the radial direction within grooves 19 and 20, respectively. That is, grooves 19 and 2
The diameter of 0 is larger than the outer diameter of the sealing material holder 18 and the sealing material holder 28 which also serves as a greasing ring by the amount of sliding. Note that the sealing material retainer 28 which also serves as a greasing ring has the roles of both greasing and sealing material retaining. Furthermore, the seal case 27 is divided into two parts as shown in FIG.
They are integrally connected by bolts 21 seen in the figure. Furthermore, the inner diameters of the sealing material holder 18 and the sealing material holder 28 which also serves as a greasing ring are made slightly larger than the outer diameter of the swing shaft 9 to the extent that the sealing material 29 does not get caught. The seal case 2B which also serves as a greasing ring is made of copper so as not to seize when sliding on the swing shaft 9 and the seal case 27, and is supplied with grease through a greasing hole 22. Incidentally, the dimension C in FIG. 2 indicates the difference between the innermost radius and the outermost radius of one elastic tube 17.

In the shaft sealing device configured as shown in FIGS. 2 and 5, the sealing material 29 is applied evenly to the swing shaft 9 at an appropriate pressure by the pressure fluid of the pressure fluid operating section 26 in the elastic tube 17. The high-pressure gas inside the furnace (on the left side in Figure 2) is sealed to prevent it from leaking to the atmosphere (on the right side in Figure 2).

Now, as shown in Figure 4, due to the difference in thermal expansion.

If the center line 30 of the hole 15 and the center line 12 of the swing shaft 9 are deviated in parallel by an amount b, the seal case 27 moves together with the casing 2 because it is fixed to the casing 2, and the seal material presser 18 and sealing material retainer 28 that also serves as a greasing ring
moves with the swing shaft 9, but since the elastic tube 17 is a highly elastic tube, it easily deforms, and the upper dimension CI of the elastic tube 17 is C shown in FIG. 2 and C shown in FIG. The sum of b, that is, c, = c + b,
The lower dimension C2 of the elastic tube 17 is obtained by subtracting b from the above C, that is, c,=c-b. That is, the pressure fluid operating portion 26 of the elastic tube 17 is filled with pressure fluid, and the dimensions C8 and 02
Even if the pressure is different, the pressure of the pressure fluid in the pressure fluid actuator 26 is much higher than the pressure caused by the expansion and contraction of the elastic tube 17, so the difference in output due to the difference in expansion and contraction of the elastic tube 17 can be ignored. A uniform pressing force is applied to the entire circumference of the ring 29, and the same good sealing performance as in the case shown in FIG. 3 is maintained.

FIG. 5 shows a case where the casing 2 is deformed due to the high temperature gas in the furnace and the center lines 12 and 30 are deviated by an angle θ. In the case of this Fig. 5, 1 elastic tube 17
Since the sealing material 29 is easily deformed and the sealing material 29 is evenly pressed onto the swing shaft 9 over the entire circumference, the sealing performance is not deteriorated.

In this way, in the shaft seal devices shown in FIGS. 2 and 6, the sealing material presser 18 and the sealing material presser 28 which also serves as a greasing ring are movable in the radial direction within the seal case 27, so that the center It is possible to sufficiently follow even large parallel deviations and tilting deviations between lines 12 and 30, and maintain good sealing property f:.

Therefore, the expensive telescopic tube 4 as shown in FIG. 1 is completely unnecessary. Further, since the clearance between the sealing material presser 18 and the seal feather presser 28 which also serves as a greasing ring and the swing shaft 9 can be reduced, the sealing material 29 is prevented from being caught in the clearance portion, and the life of the sealing material 29 is extended. Furthermore, since the pressing force of the sealing material 29 against the swing shaft 9 can be easily adjusted by the pressure regulating valve 23, a pressure sensor is provided in the casing 2 to control the pressure fluid in the pressure fluid operating section 26 according to the furnace pressure. If the pressure is automatically controlled to an appropriate pressure, the seal material 290 will prevent overpressure, so the seal material 29
This not only extends the service life of the shaft but also reduces the driving force of the shaft drive device. In particular, in the swinging furnace top charging device, the swinging shaft 9
Since the diameter of the shaft is large, the resistance due to friction between the sealing material 29 and the swing shaft 9 accounts for a large portion of the driving force, making it the most suitable shaft seal device of this type. It is also possible to make the pressure of the pressure fluid in the pressure fluid actuating part 26 of the elastic tube 17 inside the furnace lower than that on the outside air side, so that the inside of the furnace is dust-sealed and the outside air side is airtightly cooled. . Furthermore, the cooling jacket 33 shown in FIG. 2 is welded to the seal case 27, and by passing water therethrough, the seal case 27 is cooled and the elastic tube 17 is protected from the high temperature inside the furnace.

Although the above embodiment describes the case of a rocking type top charging device for a blast furnace, the present invention is not limited to this, and can be widely applied to shaft seals for general pressurized fluids. The motion of the shaft may be rotational motion, linear motion, or tilting motion.

As described above, the shaft sealing device of the present invention includes a sealing material disposed on the outer periphery of the shaft, an elastic tube provided outside the sealing material and surrounding the sealing material, and an elastic tube surrounding the sealing material. a surrounding sole case, a sealing material presser disposed inside the sealing case so as to be movable in the radial direction of the sealing case while holding down the sealing material in the axial direction, and a pressurized fluid in the elastic tube. Since it is equipped with a feeding device, misalignment in all directions between the shaft and the seal case can be absorbed within the seal device, thus eliminating the need for an expensive telescopic tube and reducing the misalignment in the shaft length direction accordingly. Since the dimensions of the structure are shortened, the vertical load and overturning moment acting on the mounting base of the deck etc. are also reduced, and the weight of the mounting base can be reduced, thereby reducing costs. In addition, since equal pressure is applied to multiple stages of sealing material, all stages of sealing material work effectively, extending the life of the sealing material, and even if the sealing material wears out, it is constantly compensated for. Since pressure is applied from the entire outer periphery, there is no need to retighten as required in the past.

Furthermore, since the pressure applied to the sealing material can be easily adjusted remotely, overpressure of the sealing material can be prevented, the life of the sealing material can be extended, and the shaft driving force can be reduced.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing an example of the rocking top charging theory of a conventional blast furnace, FIG. 2 is a sectional front view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional side view taken along the cutting line X-x in FIG. 2, FIG. 4 is an explanatory diagram of the operation of the apparatus of FIG. 2, and FIG. 5 is an explanatory diagram of another operation. 2... Casing, 9... Rocking shaft, 12... Center line of swinging shaft, 15... Hole, 16... Sealing device, 1
7...Elastic tube, 18...Seal material holder-19
, 20...Groove, 23...Pressure regulating valve, 25-...Pressure fluid source, 27...Seal case, 28...Sealing material holder that also serves as greasing ring, 29...Sealing material, 30・−
- Center line between hole and seal case. Chapter IB

Claims (1)

[Claims] 1. A sealing material disposed on the outer periphery of the shaft, an elastic tube provided outside the sealing material and surrounding the sealing material, a seal case surrounding the elastic tube, and a sealing case surrounding the elastic tube; A shaft comprising: a seal presser provided in the seal case so as to be movable in the radial direction of the seal case while holding the seal material; and a device for supplying pressurized fluid into the elastic tube. sealing device.