JPS63171134A - Shaft sealing device of rotary machine - Google Patents

Abstract

PURPOSE:To prevent the invasion of water into a bearing effectively against even a high hydraulic pressure, by a method wherein a plurality of waterproof chambers is formed by a flinger, a flinger plate and waterproof covers while respective waterproof covers are provided with water discharging ports at the bottoms thereof. CONSTITUTION:High pressure water at the outside of a packing device, which has invaded through the peripheral surface of a rotary shaft 2 and a clearance 23 at the inside of the inner peripheral surface of an annular protrusion 17 for an outside waterproof cover 16, is reduced in the invading speed and the pressure thereof in a first waterproof chamber 18 and, subsequently, is changed into water drops in a second waterproof chamber 19, further, is atomized in a third waterproof chamber 20. Then, the atomized water is mixed by a flinger plate 12 in the third waterproof chamber 20 and changed into water drops again, thereafter, the water drops are dripped and collected at the bottom of an inside waterproof cover 15. Subsequently, the collected water drops are discharged out of a first discharging port 21, provided on the inside waterproof cover 15, then, are collected in the bottom of the outside waterproof cover 16 and are discharged out of a second water discharging port 22, provided on the bottom of the outside waterproof cover 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to rotary image sealing, and relates to a shaft sealing device having an end bracket, a rotating shaft, and a bearing.
This invention relates to a rotary machine shaft sealing device that does not require extensive modification of a conventionally available product, is cost-effective within limited dimensions, and is suitable for improving the waterproof effect.

[Conventional technology]

Conventional techniques for this type of shaft sealing device include, for example, the technology disclosed in (1) Publication of Utility Model Publication No. 47-20612, (2) Publication of Publication of Utility Model Publication No. 45606 of 1982, and (3) Publication of Publication of Publication of Utility Model Publication No. 4484 of 1987, etc. There is.

However, the above-mentioned prior art does not take into consideration the following points.

(A+ The prior art disclosed in the above-mentioned Japanese Utility Model Publication No. 47-20612 uses a packing. Since the shaft sealing ability of this packing is relatively short-lived, maintenance of the packing is required.

However, in the conventional technology disclosed in Japanese Actual Publication No. 47-20612, in order to improve the waterproof effect, pairs of flingers and preservation covers are arranged in multiple layers in the force direction. That's what I do. However, the axial dimension of the shaft sealing device becomes longer.

(B) In the prior art disclosed in the above-mentioned Japanese Utility Model Publication No. 53-45606, a groove is provided on the outer surface of the bearing part, a drain plate having a horizontal projection is attached to the shaft, and the shaft and the bearing part are separated. The gap between them is covered by the above-mentioned water drainer. However, from Maro, against strong water pressure,
Reflected water from the bracket penetrates through the shaft,
It has been confirmed in experiments that water can enter the gap between the shaft and the bearing due to surface tension, so high waterproof performance cannot be expected.

(C) The technique disclosed in the above-mentioned Japanese Utility Model Publication No. 52-4484 also uses a gasket and requires maintenance of the gasket, similar to the second case described in (A+) above.

However, in the prior art disclosed in Japanese Utility Model Publication No. 52-4484, the strength of the rotary shaft is reduced by providing a groove in the rotary shaft.

By the way, Figure 6 shows JPW44. FIG. 7 is a partially cutaway side view of a general outdoor model of IP44 class, and FIG. 7 is an enlarged sectional view of the M1 portion in FIG. 6.

As shown in FIG. 6, one dimension on the load side of the model is determined by the standard, and therefore the dimension of the end bracket 1 on the load side is also restricted.

In the prior art, the shaft sealing device on the load side is configured as follows within the restricted dimensions as described above.

That is, as shown in FIG. 7, in a shaft sealing device having an end bracket 1, a rotating shaft 2, and a bearing 3, a flinger 4 is attached to the rotating shaft 2.

On the other hand, a waterproof cover 5 is attached to the end bracket 1. This end bracket 1 is provided with a drainage hole 9.

In addition, in Fig. 6, 6 is a housing, 7 is a cooling fan, and 8 is a housing.
is a fan cover.

In this prior art, water droplets that have entered the waterproof cover 5 are forced toward the N rotating shaft 3 by the rotation of the flinger 4. The cut water drops are drained through the drainage hole 9 provided in the waterproof cover 5.
is discharged to the outside through.

, 3.

This prevents water from entering the selection bearing 3.

[Problem that the invention seeks to solve]

However, in the prior art shown in FIG. 7, JPW44.
JPW55, which has even higher water pressure than Engineering P44,
For 55 class water, there was a problem that this high-pressure water entered the waterproof cover 5 and the flinger 4 could not prevent the water from entering the bearing 3 side.

An object of the present invention is to solve the problems of the prior art and
55. To provide a rotary machine shaft sealing device capable of exhibiting a high waterproofing effect even if it is directly hit by high pressure water of P55 class, even if the parts are significantly modified within limited short dimensions. It is in.

[Failure to solve the problem]

The above purpose is to install multiple flingers in the axial direction of the rotating shaft.
Attach a plurality of waterproof covers to the end bracket at intervals in the axial direction, place a large-diameter flinger plate between the axially adjacent flingers, , 4.

A plurality of waterproof chambers are formed between the flinger plate and the waterproof cover, and a drainage hole is provided at the bottom of each waterproof cover, and the drainage holes of the inner and outer waterproof covers are arranged in phase with each other. achieved.

[Effect]

In the present invention, water that has entered from the outside of the shaft sealing device through the gap between the surface of the rotating shaft and the inner periphery of the outermost waterproof cover of the plurality of waterproof covers is absorbed into the outermost one of the plurality of waterproof chambers. The water enters the outer waterproof chamber, which reduces the rate of entry and the pressure.

Then, the water whose infiltration speed and pressure have been reduced is atomized into water droplets and further atomized while proceeding to the plurality of waterproof chambers.

The mist of water that enters the waterproof chamber where the flinger plate is placed is stirred in the waterproof chamber by the flinger plate, which is formed to have a diameter larger than the outer diameter of the flinger, and becomes water droplets. It descends to the bottom of the innermost waterproof cover among the multiple waterproof covers and is collected.

Subsequently, the water is discharged from a drainage hole provided at the bottom of the innermost waterproof cover to the bottom of the outer waterproof cover,
The water is then discharged from a drainage hole provided at the bottom of the waterproof cover, and is eventually discharged to the outside of the shaft sealing device.

Therefore, in the present invention, for example, JPW55. Even with the high water pressure of IP55 class, it is possible to effectively prevent water from entering the bearing with a configuration that accommodates it within the restricted short dimensions.

However, in the present invention, the phase of the /ζ drainage hole provided in the inner waterproof cover and the drainage hole provided in the outer waterproof cover are shifted from each other, so that it is possible to drain water from the outside of the shaft sealing device through the drainage hole. It is possible to prevent a problem in which the inside of the shaft seal device is directly hit.

Furthermore, in the present invention, for example, lower-ranked standard parts,
For example, JPW44. It can be configured by making good use of the standard parts of the engineering P44 class and adding other necessary parts, so there is no need to make major modifications to the parts.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view showing one embodiment of the present invention, and FIG. 2 is a front view thereof.

In the embodiment shown in these figures, the end bracket 1 and
In a shaft sealing device having a rotating shaft 2 and a bearing 3 that supports the rotating shaft 2, an inner flinger 0, an outer flinger 11, and a flinger plate 12 are attached to the rotating shaft 2.

On the other hand, the end bracket 1 has an inner waterproof cover 15.
and an outer waterproof cover 16 are attached to each other with an interval in the axial direction.

For the inner flinger 0, standard parts similar to those of the prior art waterproof cover 5 shown in FIG. 5 are used.

This inner flinger 10 is press-fitted and attached at a position 1 where it abuts the outer end surface of the bearing 3.

The outer flinger 11 is formed to have approximately the same outer diameter as the outer diameter of the inner flinger 10. Further, as shown in FIG. 1, an annular recess 13 having a tapered surface is formed on the inner peripheral side of the outer flinger 1. Further, the outer ringer 11 has a flexi, l.

A tapered notch is formed at the end on the finger plate 12 side, and an annular groove 14 is formed with the finger plate 12. The outer flinger 11 is attached to the flinger plate 12 by moving it in and out at a position where it comes into contact with the flinger plate 12.

As can be seen from FIG. 1, the flinger plate 12 is formed to have an outer diameter larger than the outer diameter of the inner and outer flingers JO. This flinger board] 2 is the inside
The outer flinger is interposed between 0 and 11.

The inner waterproof cover 15 is a flinger board as a whole]2
and the annular groove 14g4jl at the end of the outer flinger 1]. This inner waterproof cover 15 uses standard parts similar to those of the prior art waterproof cover 5 shown in FIG. 1. This inner waterproof cover 15 is attached to the outer end surface of the end bracket 1 with a set screw or other NfjH1 material! 2J@' is attached.

Said outer waterproof cover 16 is generally annular in shape with the inner waterproof cover 15 and the outer flinger.

(2) It is formed in a shape that covers the opposite side of the groove 14. The end of the inner circumferential side of this outer waterproof cover 16 is
As shown in FIG. 1, the outer waterproof cover J6 is bent inward, and an annular projection 7 is formed on the inner peripheral side of the outer waterproof cover J6. This annular projection 7 is inserted into an annular recess 13 formed on the inner peripheral side of the outer flinger 1. The outer waterproof cover 16 is attached to the outer end surface of the end bracket by a fixing member such as a set screw.

The gap between the tapered surface of the annular recess 13 of the outer flinger 11 and the end face of the annular protrusion 17 in [6], the gap between the circumferential surface of the annular recess 13 and the outer circumferential surface of the annular protrusion 17, and the outer sacral A first waterproof chamber 18 is formed by the gap between the end surface of the outside of the flinger and the inner wall surface of the outer waterproof cover 16. In addition, the outside (the outer peripheral surface of tl+flinger J1, the outer wall surface of the inner waterproof cover 15, and the outer waterproof cover)
A second waterproof room construction 9 is formed in a space surrounded by the inner wall surface 6. Furthermore, an annular groove 14 is formed by the outer surface of the flinger plate 12, the outer surface and a notch provided at the end of the outer flinger 1, and the inner wall surface of the inner waterproof cover 15. There is a third waterproof chamber 2 in the space.
0 is formed.

Two first drainage holes 21 are provided at the bottom of the inner waterproof cover 15 at intervals in the circumferential direction. on the other hand,
A second drainage hole 22 is provided at the bottom of the outer waterproof cover 16.
One is provided. The second drainage hole 22
As shown in the figure, the first drainage hole 2] and the second drainage hole 22 are provided at an intermediate position between the first drainage hole 2] and the second drainage hole 22, and the second drainage hole 2] and the second drainage hole 22 have mutual bVc phases in the circumferential direction. are staggered.

Note that a gap 23 is provided between the curved surface of the rotating shaft 2 and the inner peripheral surface of the annular projection 17 of the outer waterproof cover 16.

The rotating machine shaft sealing device of the above embodiment operates as follows.

That is, when the rotating machine is used, the shaft sealing device is directly hit by high-pressure water from the outside, and this high-pressure water damages the surface of the rotating shaft 2 and the inner peripheral surface of the annular protrusion 17 of the outer waterproof cover 16. It enters through the gap 23 between them.

Water that has entered through the gap 23 between the curved surface of the rotating shaft 2 and the inner peripheral surface of the annular protrusion 17 of the outer waterproof cover 16 flows between the tapered surface of the annular recess 13 of the outer flinger 11 and the outer waterproof cover 1.
6 between the ends of the annular protrusion 17 and the annular recess 13
The first waterproof chamber 18 is formed by the gap between the curved surface of the annular protrusion 17 and the outer peripheral surface of the annular protrusion 17, and the gap between the outer end surface of the outer flinger and the inner wall surface of the outer waterproof cover 16. The watertight chamber 18 reduces the infiltration speed and pressure.

Next, the water whose infiltration speed and pressure have been reduced into the first waterproof chamber I8 is applied to the outer peripheral surface of the outer flinger 11, the outer wall surface of the inner waterproof cover 15, and the inner wall surface of the outer waterproof cover 6. The water enters the enclosed second waterproof chamber 19 and is further depressurized to become water droplets.

The water that has become water droplets in the second waterproof chamber 19 is drained from the inside.
Fu, 11 placed between the outer slingers 10@11.

An annular V-groove formed by the outer surface of the ringer plate 2; 3
Enter waterproof room 20. The water that has entered the third waterproof chamber 20 is in the form of mist with almost no pressure. The mist-like water in this third waterproof chamber 20 is removed by the inner and outer flingers.
0.] As the temporary flinger 12, which is formed to have a larger diameter than the outer diameter of J and is arranged between the inner and outer flingers 10-11, rotates together with the rotating shaft 2, the third waterproof chamber 2
The mixture is stirred at 0 and turned into water droplets.

The water that has become droplets in the third waterproof chamber 20 falls and is collected at the bottom of the inner waterproof cover 15 and discharged from the first drainage hole 2 provided at the bottom of the inner waterproof cover 15. be done.

The water droplets discharged from the first drainage hole 21 are collected at the bottom inside the outer waterproof cover 16, and
It is discharged to the outside from a second drainage hole 22 provided at the bottom of the tank 6.

In this embodiment, as described above, high-pressure water enters from the gap 23 between the circumferential surface of the rotating shaft 2 from the 12° portion outside the shaft sealing device and the inner circumferential surface of the annular protrusion 17 of the outer waterproof cover 16. The infiltration speed and pressure of water are reduced in the first waterproof chamber 18, and then turned into water droplets in the second waterproof chamber 19, and further atomized in the third waterproof chamber 20. The water is stirred by the flinger plate 12 and turned into droplets, which fall to the bottom of the inner waterproof cover 15 and are discharged from the first drainage hole 21 provided in the inner waterproof cover 15, and then into the outer waterproof cover 16. This outer waterproof cover 1 is collected at the bottom of the inner
Since the water is discharged to the outside from the second drainage hole 22 provided at the bottom of the shaft sealing device 6, water that has entered the shaft sealing device can be very effectively collected and discharged to the outside.

As a result, JPW55. It is possible to effectively prevent water from entering the bearing 3 even under high water pressure of IP55 class.

Further, according to this embodiment, the first drain hole 21 provided at the bottom of the inner waterproof 'f/(-15) and the second drain hole 22 provided at the bottom of the outer waterproof cover 16 are arranged in a circle. The phases are shifted from each other in the circumferential direction.Therefore, it is possible to prevent high-pressure water from directly hitting the inside of the shaft sealing device through the drainage hole.

In this embodiment, the inner flinger 10 and the inner waterproof cover 15 comply with JPW44. Using the standard parts of TPW5, such as the flinger and waterproof cover,
5. It is possible to construct a shaft sealing device that can withstand use under high water pressure of the engineering P55 class.

Next, FIGS. 3, 4, and 5 are longitudinal cross-sectional views showing various other embodiments of the present invention.

In the embodiment shown in FIG. 3, another waterproof cover 24 is attached to the inner wall surface of the outer waterproof cover 16 instead of the annular projection 9. As shown in FIG.

In addition, the outer peripheral surface of the outer flinger 11 and the outer waterproof cover 1
A first waterproof chamber 25 is defined by the inner wall surface of No. 6 and the inner wall surface of the other waterproof cover 24. This first waterproof chamber 25 consists of the circumferential surface of the rotating shaft 2, the annular recess 13 on the inner circumferential surface of the outer flinger [1], the end face of the outer flinger [1], and the inner wall surface of the inner circumferential side of the outer waterproof cover [6]. It communicates with a cavity 26 formed by the gap between.

A third drainage hole 27 is provided at the bottom of the waterproof cover 24. This third drainage hole 27 is out of phase with respect to the second drainage hole 22 provided in the outer waterproof cover 16 in the axial direction of the rotating shaft 2, so that the second and third drainage holes Even if the circumferential phases of 22 and 27 are set to be the same,
Intrusion of water into the shaft sealing device through the third drainage hole 27 is avoided.

In the embodiment shown in FIG. 3, the cavity 26
When high pressure water enters from the first waterproof chamber 25, the intrusion speed and pressure are reduced and the water enters the second waterproof chamber.
9.

Regarding other configurations and functions of the embodiment shown in FIG. 3,
This is similar to the embodiment shown in FIGS.

Next, in the embodiment shown in FIG. 4, a collar 29 is attached to the outer peripheral surface of the outer 911J flinger 28 near the outer waterproof cover 16. The outer flinger 28 has a cross section that is a parallelogram with a part of an acute angle cut vertically. The collar 29 has a rectangular cross section and an annular shape as a whole, and is fixed to the outer peripheral surface of the outer flinger 28 by press fitting or the like.

On the other hand, another waterproof cover 30 is attached to the inner wall surface of the outer waterproof cover 16. The waterproof cover 30 has an L-shaped cross section and an annular shape as a whole.

A narrow gap is formed between the outer circumferential surface of the outer flinooker 28 and the outer circumferential surface of the collar 29, through which water passes.

A first waterproof chamber 31 is formed in a space surrounded by the inner wall surface of the outer 1 waterproof cover 16, the end surface of the outer gAl-1 of the collar 29, and the inner peripheral surface of the waterproof cover 30. . The first waterproof chamber 31 communicates with a cavity 32 formed by the circumferential surface of the rotating shaft 2, the outer slope of the outer flinger 28, and the inner wall surface of the outer waterproof cover 16.

Therefore, in the embodiment shown in FIG.
.

The water entering the first waterproof chamber 31 from the first waterproof chamber 31 has a reduced infiltration speed and pressure, and the water enters the first waterproof chamber 31 through the circumference formed between the outer circumferential surface of the outer flinger 28 and the outer circumferential surface of the collar 29. The water enters the second waterproof chamber 19 through the gap.

Regarding other configurations and functions of the embodiment shown in FIG. 4,
This is similar to the embodiment shown in FIGS. 1 and 2 above.

In the embodiment shown in FIG. 5, a half portion of the outer peripheral surface of the outer flinger 33 on the outer waterproof cover 16 side is formed in a stepped shape.

Furthermore, another waterproof cover 34 is attached to the inner wall surface of the outer waterproof cover 16. This waterproof cover 34 is provided with first and second flaps 35◆36 corresponding to the stepped portions of the outer flinger 33.

A narrow gap through which water can pass is provided between the stepped portion of the outer finger 33 and the first and second flaps 35-36. The first waterproof chamber is connected to the first and second flaps 35 @ 36, and the first and second waterproof chamber portions 37 and 38 are reeds.
It is divided into two parts and is formed in multiple stages.

In the embodiment shown in FIG.
In the first waterproof chamber having the first and second waterproof chamber portions 37038, the intrusion speed and pressure are more effectively reduced, and the second waterproof chamber 191c is allowed to infiltrate.

The other configurations and functions of the embodiment shown in FIG. 5 are the same as those of the embodiment shown in FIGS. 1 and 2.

1. In the present invention, the inner flinger, the flinger plate, and the outer flinger may be configured as a single component and press-fitted onto the rotating shaft.

〔Effect of the invention〕

According to the invention described above, a plurality of flingers are attached in the axial direction of the rotating shaft, a plurality of waterproof covers are attached to the end bracket at intervals in the axial direction, and A large diameter flinger plate is arranged between these flingers, and a plurality of waterproof chambers are formed between the flingers, the flinger plate, and the waterproof cover, and a drainage hole is provided at the bottom of each waterproof cover. The water that has entered the shaft seal device is reduced in speed and pressure by entering the outermost waterproof chamber of the multiple waterproof chambers, and then proceeds to the multiple waterproof chambers. As the water travels, it becomes water droplets and is further atomized, and the mist water that enters the waterproof chamber where the flinger plate is placed is shunted by the flinger plate, which is formed to have a diameter larger than the outer diameter of the flinger. The water is stirred inside the waterproof cover, turns into water droplets, and falls to the bottom of the innermost waterproof cover among the multiple waterproof covers, and then the water drops from the drainage hole provided at the bottom of the inner waterproof cover to the outside of the waterproof cover. It is discharged to the bottom inside the waterproof cover,
The water is then discharged from a drainage hole provided at the bottom of the waterproof cover, and is eventually discharged to the outside of the shaft sealing device. Therefore, in the present invention, even with high water pressure of JPW55 and Engineering P55 class, for example, it is possible to effectively prevent water from penetrating into the bearing with a structure that accommodates it within a restricted short dimension.

According to the present invention, the trench is installed in the inner waterproof cover.
- The cut-out drainage hole and the drainage hole provided in the outer waterproof cover are out of phase with each other, which prevents a problem in which the inside of the shaft sealing device is directly hit from outside the shaft sealing device through the drainage hole. There are benefits to be gained.

Further, according to the present invention, for example, a standard part one rank lower, for example, TPW44. Since it can be configured by using the standard parts of the engineering P44 class and additionally using other necessary parts, there is no need for major modification of the parts, and there is also the effect that the figure can be reduced by 9 strokes.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional side view showing one embodiment of the present invention, Figure 2 is a front view of the same, and Figures 3, 4, and 5 are longitudinal cross-sectional views showing various other embodiments of the present invention. , Figure 6 is JPW44.
FIG. 7 is a partially cutaway side view of a general outdoor model of the IP44 class, and FIG. 7 is an enlarged sectional view of the section ■ in FIG. 6. DESCRIPTION OF SYMBOLS 1... End bracket, 2... Rotating shaft, 3... Bearing, 10... Inner finger, 11... Outer 7υ finger, 12... Flinger plate, 13... Annular recess, 15・
・・Inner waterproofing・20・Cover,】6・・Outer waterproof cover, 17・Annular projection, 18・】9・20・・1st, 2nd, 3rd waterproof chamber, 2】・22 ...1st@2nd drainage hole, 24...other waterproof cover, 25...1st waterproof chamber, 28...outer flinger, 29...collar, 3o...waterproof cover , 31...th waterproof chamber, 33... outer flinger,
34...Waterproof cover, 37, 38...First and second waterproof chamber parts constituting the fourth waterproof chamber 3rd f Figure 7

Claims (1)

[Claims] 1. In a shaft sealing device having an end bracket, a rotating shaft, and a bearing thereof, a plurality of flingers are attached in the axial direction of the rotating shaft, and a plurality of flingers are attached to the end bracket at intervals in the axial direction. A waterproof cover is attached, a flinger plate having a larger diameter than these flingers is arranged between axially adjacent flingers, a plurality of waterproof chambers are formed by the flingers, the flinger plate, and the waterproof cover, and each waterproof cover A rotary machine shaft sealing device characterized in that a drainage hole is provided at the bottom of the shaft, and the drainage holes of the inner and outer waterproof covers are shifted in phase from each other.