JP2000002190A - Slide bearing device of vertical shaft pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slide bearing device for vertical shaft pump of normal type, which can prevent seizure or burnout by lubricating the bearing part and cooling actively even if the dry operating frequency of short term has heightened or even if the dry operation has lasted for a long time in the case of a precedent standby operation pump. SOLUTION: A slide bearing device of a vertical shaft pump is equipped with a bearing member 7 supported fast on a pumping pipe 4 through a bearing table 5 and bearing casing 6 and a shaft sleeve 8 which is installed on a spindle 3 through a key 3A with possibility of simultaneous rotation and furnished with a sliding surface 8A whereon the bearing member 7 slides in circumscribing, wherein the sleeve 8 has a water storage 8C in the form of a bottom- equipped ring provided in the upper part with an opening 8D to admit passage of the lifted water, in such an arrangement that the bearing member 7 can be immersed completely underwater in the storage 8C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sliding bearing device for a vertical shaft pump.

[0002]

2. Description of the Related Art A slide bearing device of a vertical shaft pump has a main shaft 3 to which an impeller 2 housed in a discharge bowl 1 is fixed as shown in FIG. It is rotatably supported in the provided pumping pipe 4. In this plain bearing device, lubrication and cooling are performed by self-pumping during the pumping operation. However, a normal vertical pump requires a dry operation in a non-lubricated state for a short period of time during the initial operation, and a preceding standby operation pump requires a dry operation in a non-lubricated state during the in-air operation.

As shown in FIG. 5, a sliding bearing device of a vertical shaft pump capable of allowing these dry operations is provided with a bearing member 7 fixedly supported on a pumping pipe 4 via a bearing base 5 and a bearing casing 6, and a key 3A. And a shaft sleeve 8 provided with a sliding surface 8A on which the bearing member 7 is slidably circumscribed.
The bearing member 7 is made of a hard material such as ceramics, and the shaft sleeve 8 is made of a hard material such as a cemented carbide (for example, tungsten carbide).

[0004]

In the vertical bearing pump sliding bearing device having the above-described structure, a short-time dry operation can be tolerated in a normal vertical-shaft pump, but if the dry operation for a short time is repeatedly performed, seizure or burnout may occur. May occur. Further, in the case of the preceding standby operation pump, a long-time in-air operation in a non-lubricated state is predicted, and if the in-air operation is continued for a long time, there is a possibility that burning or burning may occur. For this reason, in the preceding standby operation pump, it is necessary to separately provide a water injection facility for injecting and lubricating and cooling the bearing portion, and thus the structure of the preceding standby operation pump becomes complicated and the cost increases.

[0005] Therefore, the present invention provides a simple structure to positively activate the bearing portion even if the frequency of a short dry operation is increased in a normal vertical pump or the dry operation is continued for a long time in a preceding standby operation pump. It is an object of the present invention to provide a sliding bearing device for a vertical shaft pump which can be lubricated and cooled to prevent seizure and burnout.

[0006]

According to a first aspect of the present invention, there is provided a slide bearing device for a vertical shaft pump, wherein the main shaft to which an impeller housed in a discharge bowl is fixed is fixed. In a slide bearing device of a vertical shaft pump rotatably supported in a discharge bowl and a pumping pipe provided on the downstream side of the discharge bowl, at least one of the discharge bowl and the pumping pipe is provided via a bearing base. A fixedly supported bearing member, and a shaft sleeve attached to the main shaft so as to be rotatable at the same time and provided with a sliding surface on which the bearing member is slidably circumscribed, the shaft sleeve containing the bearing member And an annular water storage portion having an opening through which water can be pumped in and out.

According to a second aspect of the present invention, in the slide bearing device for a vertical shaft pump, at least a surface of the shaft sleeve facing the upstream and a surface of the shaft sleeve facing the upstream has a pumping resistance. It is characterized in that it is formed in a shape capable of reducing loss.

Further, in the slide bearing device for a vertical shaft pump according to the invention described in claim 3, an on-off valve is provided in the annular water storage portion so as to be opened by urging of pumping water and closed when the pumping water is not energized. It is characterized by:

According to the first aspect of the invention, in the case of a normal vertical pump, the pumping water flows into the annular water reservoir from the opening of the shaft sleeve by the first pumping operation. Even if the pumping operation is stopped and the pumping operation is stopped, the state in which the bearing member is submerged in the water stored in the annular water storage portion can be maintained. Thus, at the second and subsequent startups, the dry operation is avoided, and the bearing portion is positively lubricated and cooled by the water storage, thereby preventing burning and burning. Also, in the case of the preceding standby operation pump, the pumped water flows into the annular water storage portion from the opening of the shaft sleeve by the first pumping operation. Even if the operation state is switched to the aerial operation, the state where the bearing member is submerged in the water stored in the annular water storage portion can be maintained. Thus, even if the aerial operation is continued for a long time, it is possible to avoid the dry operation and actively lubricate and cool the bearing portion by storing water, thereby preventing burning and burning. Therefore, it is not necessary to separately provide a water injection facility. Furthermore, since the annular water storage portion provided on the shaft sleeve rotates together with the main shaft, the centrifugal force acts on the water in the annular water storage portion during the pumping operation in the normal vertical shaft pump and the preceding standby operation pump, and As it is possible to store low-temperature pumped water by increasing the displaceability of water,
The lubrication / cooling effect at the time of startup or in-air operation can be improved.

[0010] According to the second aspect of the present invention, it is possible to prevent the disturbance of the pumping water, reduce the resistance loss, and improve the pump performance.

According to the third aspect of the present invention, foreign substances such as slurry are prevented from accumulating in the annular water storage section,
In addition to mitigating the intrusion of foreign matter into the sliding portion, it is possible to avoid a reduction in the water storage capacity, and to contribute to an improvement in the lubrication and cooling effects at the time of startup or in-air operation.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged vertical sectional view of an essential part showing one embodiment of the invention described in claim 1, and FIG.
The same or corresponding parts as those in the conventional example shown in FIG. In FIG. 1, a sliding bearing device of a vertical pump includes a bearing member 7 fixedly supported on a pumping pipe 4 via a bearing base 5 and a bearing casing 6, and a key 3A.
And a shaft sleeve 8 provided with a sliding surface 8A on which the bearing member 7 slidably circumscribes, and the bearing member 7 is made of a hard material such as ceramics. The shaft sleeve 8 is made of a hard material such as a cemented carbide (for example, tungsten carbide).

The shaft sleeve 8 has a boss 8B provided with a sliding surface 8A on which the bearing member 7 slidably circumscribes, and a bottomed annular portion which projects radially outward from the boss 8B and accommodates the bearing member 7. A water storage portion 8C, and the depth H of the water storage portion 8C is
The bearing member 7 is set to a value that allows the bearing member 7 to be completely submerged, and an opening 8D through which pumping water can enter / exit is provided and is open at the top. Further, the lower end surface of the boss 8B is supported by the step surface 3B of the main shaft 3, and the bottom 8 of the water storage portion 8C.
E extends horizontally toward the outside in the radial direction continuously from the lower end of the boss 8B.

According to the sliding bearing device of the vertical shaft pump configured as described above, in the case of a normal vertical shaft pump, the bearing portion is lubricated and cooled by a part of the self pumping water passing through the pumping pipe 4 during the pumping operation. You. Further, pumping flows from the opening 8D of the shaft sleeve 8 into the bottomed annular water storage section 8C by the first pumping operation. Even if the pumping is stopped by stopping the operation of the pump, the state in which the bearing member 7 is submerged in the pumping water stored in the bottomed annular water storage unit 8C can be maintained. Thus, at the second and subsequent startups, the bearing portion can be actively lubricated and cooled by the water stored in the bottomed annular water storage portion 8C while avoiding the dry operation, thereby preventing seizure and burnout.

On the other hand, in the case of the preparatory standby operation pump, the bearing portion is lubricated and cooled by a part of the self-pumped water passing through the pumping pipe 4 during the pumping operation. In addition, the first pumping operation causes the opening 8D of the shaft sleeve 8 to open the bottomed annular water reservoir 8C.
Pumped water flows into the area. Even if the operation state of the pump is switched to the air operation, the state in which the bearing member 7 is submerged in the pumped water stored in the bottomed annular water storage section 8C can be maintained. Thus, even if the aerial operation is continued for a long time, the bearing portion is actively lubricated and cooled by the water stored in the bottomed annular water storage portion 8C while avoiding the dry operation, thereby preventing burning and burning. Can be. For this reason, it is not necessary to separately provide a water injection facility required in the conventional preparatory standby operation pump.

Further, since the bottomed annular water storage section 8C provided on the shaft sleeve 8 rotates together with the main shaft 3, in a normal vertical shaft pump and a preceding standby operation pump, the bottomed annular water storage section 8C is in operation during pumping operation. Apply centrifugal force to the water
It is possible to store low-temperature pumped water by increasing the replacement of water in the water storage section 8C. For this reason, the lubrication and cooling effects at the time of startup or in-air operation can be improved.

Next, an embodiment of the invention described in claim 2 will be described. FIG. 2 is an enlarged vertical sectional view of a main part showing an embodiment of the invention as set forth in claim 2. In this figure, a lower surface 8e of a bottom 8E in an annular water storage portion 8C having a bottom toward an upstream side of pumping water. The upper surface 8f of the cover 8F attached to the upper side of the boss portion 8B toward the downstream side of the pumping water is configured in a substantially arc shape gradually increasing in diameter from the lower side to the upper side.
It is configured in a substantially arc shape whose diameter gradually decreases from the lower side to the upper side.

As described above, the lower surface 8e of the bottom portion 8E of the bottomed annular water storage portion 8C is formed in a substantially circular arc shape whose diameter gradually increases from the lower side to the upper side, thereby preventing turbulence of pumping water and pumping water. , The pump performance can be improved. In addition, since the upper surface 8f of the cover 8F is formed in an arc shape whose diameter gradually decreases from the lower side to the upper side, the flow of the flow on the downstream side is prevented, so that the resistance loss is reduced and the pump performance is reduced. It can contribute to improvement.

According to the second aspect of the present invention, the use of the cover 8F is omitted, and the lower surface 8e of the bottom portion 8E is formed in a substantially circular arc shape whose diameter gradually increases from the lower side to the upper side. Even in the configuration using only the water storage section 8C, it is possible to prevent the disturbance of the pumping, reduce the resistance loss, and improve the pump performance.

Next, an embodiment of the invention according to claim 3 will be described. FIG. 3 is an enlarged longitudinal sectional view of a main part showing an embodiment of the invention described in claim 3. In this figure, one or a circumferential direction is provided at a bottom 8E of a bottomed annular water storage portion 8C. A plurality of through holes 9 at appropriate intervals
A flap valve 10 is provided so as to open and close corresponding to the upper side of each of the through holes 9.

As described above, the flap valve 10 is provided so as to be openable and closable corresponding to the upper side of each of one or a plurality of through holes 9 provided in the bottom portion 8E of the bottomed annular water storage portion 8C. The flap valve 10 is opened by the pumping operation during the pumping operation, and the flap valve 10 is allowed to flow down through one or a plurality of through-holes 9, 9.
Accumulation of foreign matter such as slurry in C can be reduced. On the other hand, one or more through holes 9 are closed by the flap valve 10 when the pumping is not energized, such as when the operation of the normal vertical shaft pump is stopped or the preceding standby operation pump is in air operation, Water can be stored in the bottomed annular water storage section 8C, and the bearing can be lubricated and cooled at the time of startup or in-air operation by this water storage. In addition, foreign matter such as slurry is prevented from accumulating in the bottomed annular water storage section 8C, thereby mitigating intrusion of foreign matter into the sliding portion and reducing the water storage capacity of the bottomed annular water storage section 8C. By avoiding the above, it is possible to contribute to the improvement of the lubrication / cooling effect at the time of startup or during air operation.

In the above embodiment, the bearing member 7 fixedly supported on the pumping pipe 4 via the bearing base 5 and the bearing casing 6 and the main shaft 3 are attached so as to be rotatable at the same time. And a shaft sleeve 8 provided with a sliding surface 8A on which the outer peripheral surface slides. However, if necessary, the bearing member 7 is attached to the discharge bowl 1 via the bearing base 5 and the bearing casing 6 as needed. A shaft sleeve 8 fixedly supported and provided with a sliding surface 8A on which the bearing member 7 slidably contacts may be attached to the main shaft 3 so as to be able to rotate simultaneously.

[0023]

As described above, the sliding bearing device for a vertical shaft pump according to the first aspect of the present invention is a conventional vertical shaft pump, in which the frequency of dry operation in a short period of time is increased, or the preliminary standby pump is operated. Even if the dry operation is continued for a long time, the bearing can be actively lubricated and cooled with a simple structure to prevent seizure and burnout and improve reliability. In other words, in the case of a normal vertical pump, even if the pumping operation is stopped and pumping is interrupted, the state in which the bearing member is submerged in the water in the annular water storage section can be maintained. Thus, the bearing portion can be positively lubricated and cooled by the water stored in the annular water storage portion, thereby preventing seizure and burning. On the other hand, in the case of the preceding standby operation pump, even if the operation state of the pump is switched to the air operation, the state in which the bearing member is submerged in the water in the annular water storage portion can be maintained, so that the air operation can be continued for a long time. Even if it is performed, the bearing portion can be actively lubricated and cooled by the water stored in the annular water storage portion while avoiding the dry operation, so that seizure and burnout can be prevented. For this reason, it is not necessary to separately provide a water injection facility which is required in the conventional pre-standby operation pump, so that the cost can be reduced. Furthermore, since the annular water storage portion provided on the shaft sleeve rotates together with the main shaft, the centrifugal force acts on the water in the annular water storage portion during the pumping operation in the normal vertical shaft pump and the preceding standby operation pump, and It is possible to store low-temperature pumped water by increasing water substitution. This also ensures that lubrication and
The cooling effect can be improved.

In the sliding bearing device for a vertical shaft pump according to the second aspect of the present invention, at least the surface facing the upstream side of the shaft sleeve is formed in a shape capable of reducing the resistance loss of pumping water. This can contribute to improving the pump performance by preventing the resistance and reducing the resistance loss.

According to the slide bearing device of the vertical shaft pump according to the third aspect of the present invention, the on-off valve can be opened and the pumping water can be made to flow down by the urging of the pumping water. Deposition can be mitigated. On the other hand, when the pump is not energized, such as when the operation of the normal vertical shaft pump is stopped or the preceding standby operation pump is in the air, the on-off valve can be closed and water can be stored in the annular water storage section. The bearing can be lubricated and cooled at the time of startup or in-air operation. Moreover, by mitigating the accumulation of foreign substances such as slurry in the annular water storage section, the intrusion of foreign substances into the sliding section can be mitigated, and the water storage capacity of the annular water storage section can be prevented from being reduced. It can contribute to the improvement of the lubrication and cooling effects during air operation.

[Brief description of the drawings]

FIG. 1 is an enlarged vertical sectional view of a main part showing one embodiment of the invention described in claim 1;

FIG. 2 is an enlarged vertical sectional view of a main part showing one embodiment of the invention described in claim 2;

FIG. 3 is an enlarged longitudinal sectional view of a main part showing one embodiment of the invention described in claim 3;

FIG. 4 is a schematic configuration diagram showing an example of a vertical pump to which the present invention is applied.

FIG. 5 is an enlarged vertical sectional view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Discharge bowl 2 Impeller 3 Main shaft 4 Pumping pipe 5 Bearing stand 7 Bearing member 8 Shaft sleeve 8A Sliding surface 8C Bottom annular water reservoir (annular water reservoir) 8D Opening 8e Lower surface of bottom 8E (of shaft sleeve) Surface facing the upstream side of pumping water) 10 Flap valve (open / close valve)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16C 17/14 F16C 17/14 33/10 33/10 Z

Claims (3)

[Claims] 1. A slide bearing device of a vertical shaft pump for rotatably supporting a main shaft to which an impeller accommodated in a discharge bowl is fixed, in the discharge bowl and in a pumping pipe provided downstream of the discharge bowl. , A bearing member fixedly supported on at least one of the pumping pipe and the discharge bowl via a bearing stand, and attached to the main shaft so as to be simultaneously rotatable, and the bearing member is slidably circumscribed. A shaft sleeve provided with a sliding surface, wherein the shaft sleeve accommodates the bearing member, and an annular water storage portion having an opening through which pumping water can enter and exit is provided. Sliding bearing device for pumps. 2. The shaft sleeve according to claim 1, wherein at least a surface facing the upstream and a surface facing the downstream of the pumping water are formed in a shape capable of reducing a resistance loss of the pumping water. Item 2. A sliding bearing device for a vertical shaft pump according to item 1. 3. The vertical shaft pump according to claim 1, wherein an opening / closing valve is provided in the annular water storage section when the pumping water is urged, and is opened when the pumping water is not urged. Sliding bearing device.