JPH07109996A - Shaft seal device for vertical shaft pump - Google Patents

Abstract

PURPOSE:To dispense with a water charting device by suppressing abrasion of a shaft seal member with a simple structure, avoiding deterioration of sealability for preventing water leakage, and then enabling dry operation. CONSTITUTION:A shaft seal member 52 made of dry-operable material, such as synthetic resin is inserted into a shaft seal chamber 51 of a shaft seal box which is installed on a through portion 4b of a discharge elbow 4B of a shaft seal pump. A main shaft 1 is rotatably shaft-sealed in a liquid tight manner by means of the shaft seal member 52. A circular filter member provided with a blade 6A on its outer periphery is rotatably arranged on a main shaft 1, so that an upper surface of the blade 6A is arranged near a lower surface of the shaft seal box 50 with a small gap 6X.

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 vertical shaft pump.

[0002]

2. Description of the Related Art Conventionally, an impeller 2 fixed to a main shaft 1 shown in FIG. 5 is rotatably housed in an impeller chamber 3, and a pumping pipe 4A and a discharge elbow 4B are provided downstream of the impeller chamber 3. The discharge system 4 provided is connected in series, and the discharge elbow 4 of this discharge system 4 is provided.
In a vertical shaft pump that penetrates B and has the main shaft 1 led out to the outside, a shaft sealing device 5 that seals the main shaft 1 in a rotatable and liquid-tight manner.
For example, as shown in FIG. 6, a stuffing box (shaft sealing box) 50 that surrounds the main shaft 1 and discharges it and connects it to the through portion 4b of the elbow 4B, and a packing chamber (shaft sealing chamber) of this stuffing box 50. ) 51 is provided with a shaft sealing member 52 composed of a plurality of gland packings, and the shaft sealing member 52 is axially pressed and urged by a packing retainer 53 to make the inner peripheral surface of the shaft sealing member 52 a main shaft. 1, or a shaft seal member 52 formed of a segment seal inserted in a shaft seal chamber 51 of a shaft seal box 50 as shown in FIG. By pressing and fixing with the holding plate 53,
A structure is known in which the inner peripheral surface of the shaft sealing member 52 is brought into sliding contact with the outer periphery of the main shaft 1.

However, in these conventional shaft sealing devices 5, foreign matters such as dust and slurry mixed in the pumping water are formed on the bottom wall of the shaft sealing chamber 51 as shown by an arrow A in FIGS. 6 and 7. The shaft sealing member 5 passes through an annular gap 54 formed between the inner periphery of the main shaft insertion hole 51A and the outer periphery of the main shaft 1.
2 enters the sliding contact portion 55 between the main shaft 1 and the shaft sealing member 52, which is softer than the main shaft 1, to wear in a relatively short period of time. as a result,
There is a concern that water will leak due to the deterioration of the sealability.

Such a problem can be alleviated by adopting a mechanical seal. However, the mechanical seal itself has a relatively complicated structure and becomes costly, and during vertical operation (dry operation) of the vertical shaft pump, lubrication by pumping water cannot be expected, so a water injection device that supplies lubricating water during dry operation is not provided separately. It has to be provided, and has a problem that the structure is complicated and the cost is further increased.

[0005]

The problem to be solved is that, in the conventional shaft seal device for the vertical shaft pump, the shaft seal member is worn in a relatively short period of time and there is a risk of water leakage due to deterioration of the sealability. However, if the shaft seal device is configured by a mechanical seal, a water injection device must be separately provided, which is a disadvantage in terms of structure and price.

[0006]

According to the present invention, an impeller fixed to a main shaft is rotatably accommodated in an impeller chamber, and the main shaft passes through a discharge system continuously provided on the downstream side of the impeller chamber. A shaft-sealing box, which is led out to the outside and surrounds the main shaft, is continuously provided in a penetrating portion of the discharge system, and the main shaft is rotatable by a shaft-sealing member inserted in a shaft-sealing chamber of the shaft-sealing box. In a shaft seal device for a vertical shaft pump that liquid-tightly seals a shaft, the shaft seal member is formed of a material that can be dry-operated, and a filter member having a blade on an outer peripheral portion moves the blade close to the shaft seal box. It is attached to the main shaft so that it can rotate simultaneously, and wear of the shaft sealing member is suppressed by a simple structure to prevent deterioration of the sealability and prevent water leakage, while enabling dry operation and pouring water. Of equipment It was achieved omitted the purpose of location.

[0007]

According to the present invention, a part of the pumped water discharged from the impeller chamber to the discharge system by the rotation of the impeller passes through the filter member and is taken into the shaft sealing chamber of the shaft sealing box to be sealed. Lubricate the sliding contact between the member and the spindle. Foreign matter such as dust and slurry mixed in the pumped water is collected by the filter member, so that the foreign matter does not enter the sliding contact portion between the shaft sealing member and the main shaft. Further, by the rotation of the filter member having the main shaft and the blade on the outer peripheral portion, the flow of the water flowing into the shaft sealing box from the shaft sealing box side to the discharge system side in the gap between the blade and the shaft sealing box, that is, the discharge A flow is generated that suppresses the flow of water that is about to flow into the shaft-sealing box directly from the system through the gap. Therefore, part of the pumped water containing the foreign matter does not pass through the filter member and does not flow directly into the shaft-sealing box through the gap. In addition, even if foreign matter passes through the filter member and flows into the shaft-sealing box, the flow of water sent from the shaft-sealing box side to the discharge system side discharges the foreign matter that has flowed into the shaft-sealing box. Can be discharged into the system.
On the other hand, even if foreign matter is collected by the filter member and the filter member is clogged over time, and the lubrication function of the sliding contact portion between the shaft sealing member and the main spindle is lowered due to pumping, the shaft sealing member will not operate dry. Since it is made of a possible material (for example, synthetic resin), it is possible to continue the operation of the pump without causing any trouble, and it is not necessary to supply the lubricating water to the sliding contact portion during the dry operation.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. Since the feature of the present invention resides in the shaft seal device of the vertical shaft pump and the other structure is not different from that of the vertical shaft pump of FIG. 5, the same or corresponding parts will be denoted by the same reference numerals and detailed description thereof will be omitted. FIG. 1 is an enlarged vertical cross-sectional view showing a main part of the present invention. In this figure, a shaft seal chamber 51 of a shaft seal box 50 has a segment seal structure formed of a dry-driable material such as synthetic resin. A shaft sealing member 52 is inserted. The shaft sealing member 52 is pressed and fixed by a pressing plate 53, and the inner peripheral surface of the shaft sealing member 52 is attached to the outer periphery of the main shaft 1 and slidably contacts the outer periphery of a shaft sleeve 1A which rotates simultaneously with the main shaft 1.

On the other hand, an annular filter member 6 having blades 6A on the upper surface of the outer peripheral portion is attached to the main shaft 1 so as to be rotatable at the same time. The blade 6A on the upper surface of the outer peripheral portion is shown in FIGS.
As shown in FIG. 5, the blades 6a are composed of a plurality of upwardly convex blades 6a formed at appropriate intervals in the circumferential direction. These blades approach the lower surface of the shaft sealing box 50 and form a small gap 6X. Are facing through.

With such a structure, the impeller 2 of FIG.
A part of the pumped water discharged from the impeller chamber 3 to the discharge system 4 by the rotation of the is transmitted through the annular filter member 6 to the shaft sealing chamber 51 of the shaft sealing box 50 as shown by an arrow A in FIG. The sliding contact portion 55 between the shaft sealing member 52 and the shaft sleeve 1A is taken in.
Lubricate. Since foreign matters such as dust and slurry mixed in the pumped water are collected by the annular filter member 6, the foreign matters do not enter the sliding contact portion 55 between the shaft sealing member 52 and the shaft sleeve 1A. Therefore, abrasion of the shaft sealing member 52 due to foreign matter is suppressed, and it is possible to prevent deterioration of the sealing property and prevent water leakage.

Further, as the main shaft 1 and the annular filter member 6 and the blades 6A on the upper surface of the outer peripheral portion of the filter member 6 rotate at the same time, the flow shown by the arrow B in the gap 6X,
That is, a flow is generated in which the pumped water that has entered the shaft-sealing box 50 is discharged and sent to the penetrating portion 4b side of the elbow 4B. As a result, the flow of pumped water (arrow C) that tends to flow directly into the shaft-sealing box 50 from the penetrating portion 4b side of the discharge elbow 4B through the gap 6X is suppressed. Therefore, a part of the pumped water containing the foreign matter does not directly flow into the shaft sealing box 50 through the gap 6X. Even with such an action, it is possible to prevent the inconvenience that foreign matter enters the sliding contact portion 55 between the shaft sealing member 52 and the shaft sleeve 1A. In addition, even if foreign matter should pass through the filter member 6 and flow into the shaft-sealing box 50, the foreign matter is discharged from the shaft-sealing box 50 side and the elbow 4
By the flow of the arrow B sent to the penetrating portion 4b side of B, the foreign matter that has flowed into the shaft sealing box 50 can be discharged and discharged to the elbow 4B side, so that the sliding contact portion 55 between the shaft sealing member 52 and the shaft sleeve 1A can be discharged. There is no intrusion.

On the other hand, since the foreign matter is collected by the annular filter member 6, the annular filter member 6 is clogged with time, and the sliding contact portion 55 between the shaft sealing member 52 and the shaft sleeve 1A due to pumping water. Since the shaft sealing member 52 is formed of a dry-driving material such as a synthetic resin even if the lubrication function of the pump is deteriorated, the pump can be continuously operated without any trouble and the sliding contact portion can be operated during the dry operation. Lubricating water may not be supplied to 55. That is, it is possible to omit the installation of the water injection device that supplies the lubricating water to the sliding contact portion 55 during the dry operation.

FIG. 4 shows a modified example of the annular filter member 6, in which the blade 6A on the outer circumference is lowered below the boss portion on the inner circumference so that the filter surface is inclined downward. By using such an annular filter member 6, foreign matter that has passed through the filter member 6 and has flowed into the shaft-sealing box 50 is likely to move to the gap 6X side, and is discharged from the shaft-sealing box 50 side to discharge the elbow 4B. It becomes easier to discharge the foreign matter to the side.

In the above embodiment, the inner peripheral surface of the shaft sealing member 52 is slidably contacted with the outer periphery of the shaft sleeve 1A mounted on the outer periphery of the main shaft 1, but the shaft sleeve is described. 1A may be omitted and the inner peripheral surface of the shaft sealing member 52 may be brought into sliding contact with the outer periphery of the main shaft 1.

[0015]

As described above, according to the present invention, foreign matter such as dust and slurry mixed in pumped water can be collected by the annular filter member, so that the foreign matter enters the sliding contact portion between the shaft sealing member and the main shaft. There is nothing to do. In addition, since the flow of pumped water that tries to flow directly into the shaft-sealing box from the discharge system through the main shaft penetrating portion is suppressed by the flow that is sent from the shaft-sealing box side to the discharge system side due to the rotation of the blades, foreign matter is included. Part of the pumped water does not pass through the annular filter member, and does not flow directly into the shaft sealing box through the main shaft penetrating portion. Moreover, even if a foreign matter should pass through the filter member and flow into the shaft-sealing box, the foreign matter flown into the shaft-sealing box can be discharged to the discharge system by the flow generated by the rotation of the blades. for that reason,
With a simple structure, it is possible to prevent wear of the shaft sealing member, prevent deterioration of sealing performance, and prevent water leakage. on the other hand,
Since the shaft sealing member is formed of a material that can be dry-operated, foreign matter is collected by the annular filter member, which causes clogging of the annular filter member over time, resulting in pumping of the shaft sealing member and the main shaft. Even if the lubrication function of the sliding contact portion is deteriorated, the pump can be continuously operated without any trouble, and it is not necessary to supply the lubricating water to the sliding contact portion during the dry operation. In other words, installation of a water injection device can be omitted, which is advantageous in terms of structure and price.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view showing a main part of the present invention.

FIG. 2 is a plan view of an annular filter member.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is a partial cross-sectional view showing a modified example of an annular filter member.

FIG. 5 is a schematic configuration diagram showing an example of a vertical shaft pump to which the present invention is applied.

FIG. 6 is an enlarged vertical sectional view showing an example of a conventional shaft sealing device.

FIG. 7 is an enlarged vertical sectional view showing another example of a conventional shaft sealing device.

[Explanation of symbols]

 1 Spindle 2 Impeller 3 Impeller Chamber 4 Discharge System 4b Discharge System Penetration Part 5 Shaft Sealing Device 6 Annular Filter Member (Filter Member) 6A Blade 50 Shaft Sealing Box 51 Shaft Sealing Chamber 52 Dry Driving Shaft Sealing Member

Claims (1)

[Claims] 1. An impeller fixed to a main shaft is rotatably accommodated in an impeller chamber, and the main shaft is led out to the outside through a discharge system continuously provided on the downstream side of the impeller chamber. A shaft-sealing box surrounding the main shaft is continuously provided in a penetrating portion of the shaft, and a vertical shaft that seals the main shaft in a rotatable and liquid-tight manner by a shaft-sealing member inserted in a shaft-sealing chamber of the shaft-sealing box. In a shaft seal device for a pump, the shaft seal member is made of a material that can be dry-dried, and a filter member provided with blades on an outer peripheral portion can rotate the main shaft at the same time by bringing the blade close to the shaft seal box. A shaft seal device for a vertical shaft pump, which is mounted on a shaft.