JPH08200285A - Shaft seal device - Google Patents

Abstract

PURPOSE: To provide a shaft seal device with which scattering of liquid leaking from an inner side and overheating of a shaft seal part abnormally worn, in the shaft seal part of a shaft inserted through a casing is prevented. CONSTITUTION: In a shaft seal device 1 having a gland packing 13 and a gland retainer 16 in a through part of inserting a shaft 10 of a centrifugal pump 3 through a casing 7 to prevent leaking of the seawater in the inside, the gland retainer 16 comprises a lip seal 20 sealing the seawater leaking from the inside from outside the gland retainer 16, liquid reservoir part 17 accumulating the leaked seawater and a discharge hole 19 of the seawater provided in a side 18 stagnating the seawater in the liquid reservoir part 17 of the gland retainer 16 in a direction orthogonal to the shaft 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft-sealing portion between a partition wall for partitioning a high-pressure side and a low-pressure side and a rotary shaft penetrating the partition wall, and in particular, splashing of leaked liquid in the shaft-sealing portion. The present invention relates to a shaft sealing device that prevents the above.

[0002]

2. Description of the Related Art Conventionally, as a shaft sealing device, for example, one shown in FIG. 4 has been known. This shaft sealing device 1 is provided in a large-sized double suction spiral wound pump 3 for seawater, and the double suction spiral wound pump 3 is mounted on a shaft 10 penetrating a casing 7 that partitions an inner side 4 and an outer side 5. The impeller 28 is attached via the key 11, is connected to a drive source (not shown) via a shaft coupling 29, and the shaft 10 is rotated to feed seawater. The shaft sealing device 1 presses the gland packing 13 provided between the casing 7 and the sleeve 12 fitted into the shaft 10 by the gland presser 16, but leaks a small amount of seawater on the inner side 4, The shaft seal is being cooled. In order to reduce the amount of leakage from the shaft seal portion, it is necessary to tighten the gland presser 16. However, if it is tightened too much, the gland packing 13 and the sleeve 12 generate heat and wear, so that some leakage of seawater is necessary.

[0003]

However, leakage seawater leaks from the shaft sealing portion of the large double suction centrifugal pump 3 into the shaft 1.
0 leaks to the outside 5 and is further scattered as a splash by the centrifugal force due to the rotation of the shaft 10 or the draining ring 27, and the bearing box 31 of the bearing is contaminated with salt or other contained substances in seawater. Was there.

In the past, the shaft sealing portion was covered with a cover to prevent scattering. However, this cannot be completely prevented. Leaked seawater scatters in the vicinity and the heat generated by the bearing causes salt in seawater, etc. The substance contained in solidified and was contaminated.

In order to prevent the splashing and splashing of the splashes, it is necessary to tighten the gland packing 13 with the gland presser 16. However, if the gland packing 13 is tightly tightened, the shaft seal portion generates heat due to an increase in frictional force, and the gland packing 13 Also, the sleeve 12 is abnormally worn. Therefore, it is necessary to leak seawater to some extent and lubricate and cool the gland packing 13 and the sleeve 12. In FIG. 4, the shaft sealing portion of the spiral pump 3 is supplied with high-pressure seawater on the outlet side of the spiral pump 3 through the sealing water pipe 15 to the position of the sealing ring 14 of the shaft sealing portion. It is supplied to the shaft seal together with leaked water from the shaft to prevent overheating and abnormal wear of the shaft seal. The seawater leaking to the bracket 30 is discharged from the drain port 9 to the outside of the spiral pump 3.

An object of the present invention is to prevent the leakage of liquid from the high pressure side in the shaft seal portion between the partition wall for partitioning the high pressure side and the low pressure side and the rotary shaft penetrating the partition wall, and An object of the present invention is to provide a shaft sealing device which prevents the shaft sealing portion from overheating and abnormal wear and which can easily adjust the amount of leaked liquid.

[0007]

In order to achieve the above object, the present invention partitions a high pressure side where a liquid having a high pressure is present and a low pressure side where the pressure is lower than the high pressure side, and through which a rotating shaft penetrates. A cylindrical space portion is provided near the low-pressure side of the penetrating portion of the, a shaft sealing material for shaft sealing is inserted into the cylindrical space portion, and a liquid having a high pressure is pressed by a pressing member that presses the shaft sealing material. In the shaft sealing device for axially sealing leakage, the pressing member includes a sealing material for sealing the liquid leaked from the high pressure side from the low pressure side of the pressing member, and a discharge hole for discharging the leaked liquid. It is a thing.

Further, in the above invention, the pressing member has a liquid pool portion for collecting the liquid leaked from the high pressure side near a low pressure side of an insertion portion of the pressing member through which the shaft is inserted. .

In any of the above inventions, the discharge hole is provided at a position where the liquid of the pressing member stays in a direction orthogonal to the shaft.

Further, in any of the above inventions, in the shaft sealing device, a shaft for rotating an impeller of a pump for giving energy to a liquid and sending the liquid penetrates a casing partitioning the inside and the outside of the pump. It was installed in.

[0011]

According to the present invention, the pressing member is provided with the sealing material for sealing the liquid leaking from the high pressure side from the low pressure side of the pressing member and the discharge hole for discharging the leaking liquid. Liquid leaked from the high pressure side is sealed from the low pressure side of the pressing member with a sealing material, and at the same time, discharged from the discharge hole provided in the pressing member, and the liquid leaks to the low pressure side of the pressing member and scatters. And the amount of leaked liquid in the penetrating portion can be easily adjusted.

Further, in the above invention, since the pressing member has a liquid pool portion for collecting the liquid leaked from the high pressure side near the low pressure side of the insertion portion of the pressing member through which the shaft is inserted, the pressing member of the above invention is provided. In addition to the function, the liquid leaked from the high pressure side is temporarily stored in the liquid pool, the leak pressure is reduced, and the liquid is quickly discharged from the discharge hole.

In any one of the above inventions, since the discharge hole is provided at a position where the liquid of the pressing member stays in the direction orthogonal to the shaft, in addition to the operation of any one of the above inventions, The liquid is more easily drained.

In any one of the above inventions, in the shaft sealing device, a shaft for rotating an impeller of a pump that imparts energy to the liquid and sends the liquid penetrates a casing that divides the inside and the outside of the pump. Therefore, in the same way as any one of the above-mentioned actions, while preventing the leakage of liquid leaking from the inside of the shaft sealing portion of the rotary shaft that penetrates the casing that separates the inside and the outside of the pump, This is a shaft sealing device in which the amount of leaked liquid in the penetrating portion can be easily adjusted.

[0015]

Embodiments of the shaft sealing device according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a shaft sealing device according to the present invention. The shaft sealing device 1 of the present embodiment is provided in a spiral pump 3 that imparts energy to seawater and sends it out. A shaft 10 for rotating an impeller (not shown) has high pressure in the spiral pump 3. Is provided in a penetrating portion that penetrates a casing 7 that is a partition wall that separates an inner side 4 that is a high pressure side and an outer side 5 that is a low pressure side having a lower pressure than the inner side 4.

In the shaft sealing device 1, a cylindrical space 8 is provided on the outer side of the through portion of the casing 7, and a gland packing 13, which is a shaft sealing material for shaft sealing, is inserted into the cylindrical space 8. , The gland packing 1 by the gland presser 16 which is a pressing member for pressing the gland packing 13.
By pressing 3, the leakage of high pressure seawater is sealed. The gland retainer 16 is a lip seal 20 which is a sealing material for sealing the seawater leaked from the inner side 4 from the outer side 5 of the gland retainer 16, a discharge hole 19 for discharging the leaked seawater, and an outside of the insertion portion of the gland retainer 16. 5 is provided with a liquid pool portion 17 for storing seawater leaked from the inner side 4 on the side nearer to 5. The discharge hole 19 is provided on the side 18 of the gland retainer 16 where the seawater is retained in the direction orthogonal to the shaft 10.

The shaft 10 is rotatably supported by a bearing box 31 supported by a bracket 30 extending from the casing 7, and a sleeve 12 is fitted and inserted into a penetrating portion penetrating the casing 7. The ground presser 16
The gland packing 13 is pressed by the studs 24 and nuts 25 that are planted in the casing 7. Furthermore,
A drain port 9 is provided at the bottom of the bracket 30. Further, in the shaft sealing device 1 of the present embodiment, the draining ring 27 is provided near the bearing box 31 of the shaft 10.

FIG. 2 is a sectional view of the gland presser 16 of FIG. A space for the liquid reservoir 17 is provided sufficiently wide in the inner portion through which the shaft 10 penetrates, and a seawater discharge hole 19 is provided in the lower side 18 where the seawater is retained. On the outside of the gland retainer 16 (right side in the figure), the lip seal 2
0 is fixed by tightening the stopper 21 with the set bolt 22 to the gland presser 16.

FIG. 3 is an exploded perspective view of the gland presser 16 of FIG. The gland retainer 16 has two flange portions 26 with a through portion through which the shaft 10 (not shown) penetrates being sandwiched.
And two bolt holes 16a through which the stud 24 shown in FIG. 1 passes are provided. As described above,
The lip seal 20 is fixed by passing a set bolt 22 through a bolt hole 21 a provided in the stopper 21 and fastening the set bolt 22 in a bolt screw hole 23. In addition, ground holder 1
6 body and stopper 21 are made of stainless steel (SUS30
4).

The shaft sealing device 1 of the present embodiment having the above structure
Works as follows. That is, the ground press 16
Holds the seawater leaked from the inside 4 into this ground 16
Since the lip seal 20 that seals from the outer side 5 and the discharge hole 19 that discharges the leaked seawater are provided, the seawater that leaks from the inner side 4 is sealed by the lip seal 20 from the outer side 5 of the gland retainer 16. At the same time,
It is discharged from the discharge hole 19 provided in the gland press 16,
Seawater does not leak to the outside 5 of the gland press 16 and is not scattered by the centrifugal force of the shaft 10, and the amount of leaked seawater at the penetration portion can be easily adjusted.

Further, the gland presser 16 is the shaft 1
Since the gland retainer 16 through which 0 is inserted has a liquid pool 17 near the outside 5 near the outside, the seawater leaking from the inside 4 is temporarily stored in the pool 4. The pressure that is stored in and leaks there is reduced, and it is prevented from leaking to the outside beyond the lip seal 20, and is quickly discharged from the discharge hole 19.

Further, since the discharge hole 19 is provided at a position where the seawater of the gland presser 16 stays in the direction orthogonal to the shaft 10, the seawater of the liquid pool portion 17 can be discharged more easily.

In the shaft sealing device 1 of this embodiment, the gland retainer 16 is provided with a liquid pool portion 17 whose inner space is enlarged by cutting the shaft 10 insertion side of the gland retainer 16, and the outside of the gland retainer 16 is machined. , Lip seal 20 (Viton) was attached. Further, a drain hole 19 is provided by making a hole in the lower portion (retaining side 18) of the liquid reservoir 17 so that leaked seawater directly falls near the drain port 9 of the bracket 30. The leaked seawater enters the liquid pool 17 sealed by the lip seal 20 and directly drops from the drain hole 19,
Since seawater leaking from between the sleeve 12 of the shaft 10 and the gland packing 13 does not reach the outside through the shaft 10, it does not become a droplet in the vicinity to be scattered and polluted. Further, since the splash due to the splash of seawater can be prevented, the amount of seawater leaked from the inner side 4 of the spiral pump 3 can be adjusted by the tightening force of the gland packing 13, and the amount of leaked seawater can be increased to cause overheating and wear of the gland packing 13. Can be prevented, and the life of the gland packing 13 can be significantly extended.

The present invention has been described in detail with reference to the illustrated embodiments. However, the present invention is not limited to these embodiments. For example, the present gland presser 16 is a large industrial gland. A packing seal type pump can be used with either seawater or fresh water.
Further, although the shaft sealing portion of the shaft sealing device 1 of the present embodiment is not provided with the water sealing pipe 15 shown in FIG. 4, the water sealing pipe 15 is provided,
A structure that prevents leakage of water on the inner side 4 and overheating and abnormal wear of the shaft sealing portion may be used. In short, it goes without saying that various modifications can be made by making various modifications without departing from the spirit of the present invention.

[0025]

According to the present invention, since the pressing member is provided with the sealing material for sealing the liquid leaked from the high pressure side and the discharge hole for discharging the liquid, the liquid is provided on the low pressure side of the pressing member. Does not leak and scatter, and the amount of leaked liquid in the penetrating portion can be easily adjusted.

Further, in the above invention, since the pressing member has the liquid pool for storing the liquid leaked from the high pressure side, in addition to the effect of the above invention, the leakage pressure of the liquid pool is reduced and the liquid is discharged. It is quickly discharged from the hole.

In any one of the above inventions, since the discharge hole is provided at the position where the liquid of the pressing member stays in the direction orthogonal to the shaft, in addition to the effect of any one of the above inventions, the liquid in the liquid pool Is more easily discharged.

In any of the above inventions, in the shaft sealing device, the shaft for rotating the impeller of the pump is provided at the penetrating portion that penetrates the casing that separates the inside and the outside of the pump. Similar to any one of the effects, the shaft sealing device is capable of preventing the liquid leaked from the inside of the penetration portion of the pump from scattering and easily adjusting the amount of leakage liquid in the penetration portion.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a shaft sealing device according to the present invention.

FIG. 2 is a cross-sectional view of the gland retainer of FIG.

FIG. 3 is an exploded perspective view of the gland retainer of FIG.

FIG. 4 is a cross-sectional view of a large-sized double-suction centrifugal pump using the shaft sealing device according to the related art.

[Explanation of symbols]

 1 Shaft Sealing Device 3 Whirlpool Pump (Pump) 4 Inside (High Pressure Side) 5 Outside (Low Pressure Side) 7 Casing (Partition Wall) 8 Cylindrical Space 10 Shaft 13 Gland Packing (Shaft Sealing Material) 16 Gland Pressing (Pressing Member) 18 Retaining side 19 Discharge hole 20 Lip seal (seal material) 28 Impeller

Claims (4)

[Claims] 1. A cylindrical space portion is provided near a low pressure side of a penetrating portion of a partition wall through which a rotating shaft penetrates to separate a high pressure side where a liquid having a high pressure is present and a low pressure side where the pressure is lower than the high pressure side. A shaft for sealing the leakage of the high-pressure liquid by inserting a shaft sealing material for sealing the shaft into the cylindrical space and pressing the shaft sealing material with a pressing member for pressing the shaft sealing material In the sealing device, the pressing member includes a sealing material that seals the liquid leaking from the high pressure side from the low pressure side of the pressing member, and a discharge hole that discharges the leaking liquid. Shaft seal device. 2. The pressing member according to claim 1, wherein the pressing member has a liquid pool portion that collects the liquid leaked from the high pressure side near a low pressure side of an insertion portion of the pressing member through which the shaft is inserted. A shaft sealing device characterized by being present. 3. The shaft sealing device according to claim 1, wherein the discharge hole is provided on a side of the pressing member where the liquid stays in a direction orthogonal to the shaft. 4. The shaft sealing device according to claim 1, wherein a shaft that rotates an impeller of a pump that imparts energy to the liquid and sends the liquid penetrates a casing that divides the inside and the outside of the pump. A shaft sealing device, characterized in that it is provided in a penetrating portion.