JPH1182483A - Segment type bearing device and vertical shaft drainage pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a stable operation for a long time even when rainwater (pumped liquid) is carried into a bearing device by using a liquid nonvolatile and having a specific gravity larger than the pumped liquid as lubricant. SOLUTION: This device has a plurality of segment-like guide bearings 5 arranged along the circumference between a bearing case 4 and a sleeve 2 and an oil tank 6 for storing its lubricant 7. As the lubricant 7, a nonvolatile liquid having a specific gravity larger than a pumped liquid (rainwater), for example, a fluorine oil (specific gravity: about 2.0) or a phosphate oil (1.2) is preferably used. Since the lubricant 7 has the specific gravity larger than that of the pumped liquid even if the pumped liquid is penetrated into the bearing device, the pumped liquid layer is formed above the lubricant 7 in the oil tank 6. Therefore, the bearing 5 is continuously operable for a long time since it is laid in the state dipped in the lubricant 7, and the lubricant 7 is not carried out of the device since it is not substituted by the pumped liquid, so that the contamination can be also prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment type bearing device for supporting a main shaft of a large pump, and more particularly to a bearing device for a vertical shaft rainwater drainage pump.

[0002]

2. Description of the Related Art In the case of a large pump, segment type bearing devices for supporting a main shaft are disposed at two positions, that is, an upper portion of a runner and a lower portion of a transmission. The segment type bearing device arranged in the lower portion of the transmission is configured by combining a guide bearing portion and a thrust bearing portion. Further, the segment type bearing device disposed above the runner is constituted only by the guide bearing portion. In these segment type bearing devices, mineral oil-based turbine oil is used as a lubricating liquid. Turbine oil has a specific gravity of 0.87 and is smaller than the pumped liquid (specific gravity 1.0). Examples of structures in the case of a segment type bearing device consisting of only a guide bearing portion include mechanical drawings (slide bearing,
Published by The Japan Society of Mechanical Engineers, first edition on November 20, 1969) 4
It is disclosed on pages 8, 49.

[0003] Similarly, a configuration in which a guide bearing portion and a thrust bearing portion are combined in a segment type bearing device is disclosed on pages 40 and 41 of the aforementioned mechanical drawings.

[0004] Usually, in this type of large pump, the bearing is lubricated with mineral oil-based turbine oil in the segment type bearing device, so that long-term drainage operation can be performed stably.

However, on the other hand, due to rapid urbanization in recent years, when the amount of rainfall increases, the amount of rainwater flowing into the drainage station becomes large and rapid, and the drainage station may be flooded. Even if the drainage pump station is flooded, the mission of the pumping station is to be able to perform drainage operation continuously for three days.

[0006]

However, when such a submerged condition occurs, the mineral oil-based turbine oil (specific gravity 0.87) in the segment type bearing device flows out and is replaced by rainwater (pumped liquid). You. As a result, damage due to poor lubrication of the bearing occurs, and drainage operation becomes impossible.

That is, in the above-described segment type bearing device, it is impossible to perform a long-time draining operation due to the inflow of rainwater (pumped liquid) into the bearing portion.

The present invention has been made in view of such circumstances, and a segment type bearing for a pump capable of performing a long-term drainage operation stably even when rainwater (pumped liquid) flows into the segment type bearing device. It is intended to provide a device.

[0009]

That is, according to the present invention, a sleeve is fixed to a pump main shaft, and a plurality of bearing cases are provided along the circumferential direction between the bearing case and the sleeve. Segment-type guide bearing and a segment type bearing device provided with an oil tank for storing a lubricating liquid for the bearing, by using a liquid that is non-volatile to the lubricating liquid and has a specific gravity higher than that of the pumping liquid. It is intended to achieve the intended purpose.

Further, a sleeve is fixed to the pump main shaft,
A segment type provided with a bearing case arranged at an outer peripheral position of the sleeve, a plurality of segment-shaped guide bearings arranged along the circumferential direction between the bearing case and the sleeve, and an oil tank for storing lubricating fluid for the bearing. In the bearing device, a liquid which is non-volatile to the lubricating liquid, has a specific gravity higher than that of the pumping liquid, and has a property of being separated from the pumping liquid is used.

In addition, a sleeve is fixed to the pump main shaft,
A segment type provided with a bearing case arranged at an outer peripheral position of the sleeve, a plurality of segment-shaped guide bearings arranged along the circumferential direction between the bearing case and the sleeve, and an oil tank for storing lubricating fluid for the bearing. In the bearing device, a liquid that is non-volatile to the lubricating liquid, has a specific gravity higher than that of a foreign substance such as stone, and has a property of being separated from a pumping liquid is used.

That is, in the segment type bearing device configured as described above, since the non-volatile lubricating liquid and the liquid having a higher specific gravity than the pumping liquid are used, the inflow of rainwater (pumping liquid) is prevented. Even if there is, the lubricating liquid is not replaced by the pumping liquid, so that the lubrication of the bearing is maintained even during the flooding, and the drainage operation can be stably performed for a long time.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view showing a first embodiment of the segment type bearing device according to the present invention. The segment type bearing device 3 shown in FIG. 1 is arranged above the runner 15 and supports the pump main shaft 1. The segment type bearing device 3 includes a pump main shaft 1, a fixed sleeve 2, a bearing case 4 disposed at an outer peripheral position of the sleeve 2, and a plurality of circumferentially arranged between the bearing case 4 and the sleeve 2. Segmented guide bearing 5
And an oil tank for storing the lubricating liquid 7 for the guide bearing 5. Here, the structure in which the back surface of the guide bearing 5 is supported by the adjustment bolt 8 is used, but a structure in which the guide bearing 5 is directly fixed to the bearing case 4 without the adjustment bolt 8 may be used, and the bearing structure is not particularly limited. Also,
As the lubricating liquid 7, a non-volatile liquid having a higher specific gravity than the pumping liquid (rainwater) is contained. For example, the lubricating liquid 7 is made of a fluorine-based oil (specific gravity of about 2.0), a phosphate ester oil (specific gravity of 1.
2), perfluoropolyether oil (specific gravity: 1.9), silicon-based oil and the like are preferable.

In the thus constructed segment type bearing device, even if the pumping station is flooded and pumped liquid (rainwater) enters the segment type bearing device, the specific gravity of the lubricating liquid 7 is 1. Since it is larger than 0, a pumping liquid (rainwater) layer is formed on the lubricating liquid 7 in the oil tank 6 and exists in a two-layer state. In this case, the upper layer is pumped liquid (rainwater), and the lower layer is lubricating liquid 7.
Becomes

As a result, the bearing 5 is immersed in the lubricating liquid 7, so that long-time continuous operation is possible. Further, since the lubricating liquid 7 is not replaced with the pumping liquid, the lubricating liquid 7 does not flow out of the segment type bearing device, and contamination due to flooding can be prevented. Further, since the lubricating liquid 7 has a characteristic of being separated from the pumping liquid, deterioration of the lubricating liquid 7 can be prevented, and the lubricating characteristics of the lubricating liquid 7 can be reliably maintained.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the segment type bearing device according to the present invention.

The segment type bearing device 3a shown in FIG.
It is arranged below the transmission 14 and supports the pump main shaft 1. In this segment type bearing device 3a, a thrust block 10 is fixed to a pump main shaft 1, and a bearing case 4a is disposed at an outer peripheral position of the thrust block 10.
And a plurality of segment-shaped guide bearings 5a arranged along the circumferential direction between the bearing case 4a and the thrust block 10, a collar 11 attached to the lower surface of the thrust block 10, and a collar 11 facing the collar 11. And a plurality of pad-type thrust bearings 12 and an oil tank 6a for storing a lubricating liquid 7 for these bearings. Here, the oil tank 6a includes an inner cylinder 6b and an outer cylinder 6c fixed to the bearing casing 9a. A cover 13 is fixed to an upper portion of the outer cylinder 6c. As the lubricating liquid 7, a non-volatile liquid having a higher specific gravity than the pumping liquid (rainwater) is contained as in the first invention.

According to this embodiment, basically the same functions and effects as those of the first embodiment can be obtained. In the above embodiments, the lubricating liquid 7 is non-volatile
(Rainwater) contains a liquid with a higher specific gravity than
When a liquid having a specific gravity higher than that of the stone (specific gravity of about 2.0) is used, the stone floats on the lubricating liquid 7 and damage to the bearing due to foreign matter can be prevented. can get.

Next, a case where the segment type bearing device of the present invention is applied to a vertical shaft drainage pump will be described. That is, as shown in FIG. 3, the vertical shaft drain pump has a pump main shaft 1, a runner 15 fixed to the lower portion of the pump main shaft 1, a pump casing 16 having the pump main shaft 1 inserted therein and having a water flow path formed therein. And the segment type bearing device 3, 3a according to the present invention, which is mounted above the pump casing 16 and rotatably supports the pump main shaft. The segment type bearing device 3 is provided with a sleeve 2 fixed to the pump main shaft 1, a bearing case 4 arranged at an outer peripheral position of the sleeve 2, and a plurality of circumferentially arranged between the bearing case 4 and the sleeve 2. Segmented guide bearing 5
And an oil tank for storing the lubricating liquid 7 for the bearing 5. In the segment type bearing device 3a, a thrust block 10 is fixed to the pump main shaft 1, and a bearing case 4a is disposed at an outer peripheral position of the thrust block 10.
And a plurality of segment-shaped guide bearings 5a arranged in the circumferential direction between the bearing case 4a and the thrust block 10, and the collar 1 attached to the lower surface of the thrust block.
1 and a plurality of pad-type thrust bearings 12 arranged opposite to the collar 11 and an oil tank 6a for storing a lubricating liquid 7 for these bearings. The pump main shaft 1 is driven via a transmission 14.

According to the embodiment, even if the pumped liquid flows into the segment type bearing devices 3 and 3a of the present invention from the upper surface 16a of the pump casing 16, the lubricating liquid 7 is not replaced by the pumped liquid, so that the bearing can be lubricated and drained. Operation can be performed continuously even during flooding.

[0021]

As described above in detail, according to the present invention, the use of a non-volatile liquid having a higher specific gravity than the pumping liquid as the lubricating liquid for the segment-type bearing device allows the rainwater ( Since the lubricating liquid is not replaced by the pumping liquid even when the pumping liquid flows in, the lubrication of the bearing is maintained and the drainage operation can be stably performed for a long time.

Further, since the lubricating liquid does not flow out of the segment type bearing device, contamination by flooding can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a segment type bearing device according to the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the segment type bearing device according to the present invention.

FIG. 3 is a vertical sectional view showing a vertical shaft drainage pump to which the segment type bearing device according to the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pump main shaft, 2 ... Sleeve, 3 ... Segment bearing device, 4 ... Bearing case, 5, 5a ... Guide bearing, 6 ... Oil tank, 7 ... Lubricating liquid, 8 ... Adjustment bolt, 9, 9a ... Bearing casing, 10 ... Thrust block, 11 ... color, 12
... Thrust bearing, 13 ... Cover, 14 ... Transmission, 15 ...
Runner, 16: pump casing, 16a: upper surface of pump casing.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shigenobu Nagasawa 603 Kandate-cho, Tsuchiura-shi, Ibaraki Pref.

Claims (13)

[Claims] A bearing case fixed to a pump main shaft and arranged at an outer peripheral position of the sleeve; a plurality of segment-shaped guide bearings arranged along the circumferential direction between the bearing case and the sleeve; A segment-type bearing device provided with an oil tank for storing a lubricating liquid for the bearing, wherein a non-volatile liquid having a specific gravity higher than that of a pumping liquid is used as the lubricating liquid. 2. A bearing case in which a sleeve is fixed to a pump main shaft, and is arranged at an outer peripheral position of the sleeve; a plurality of segment-shaped guide bearings which are arranged along the circumferential direction between the bearing case and the sleeve; In a segment type bearing device provided with an oil tank for storing a lubricating liquid for the bearing, a liquid that is non-volatile to the lubricating liquid, has a specific gravity higher than that of a pumping liquid, and has a property of being separated from the pumping liquid is used. A segment type bearing device characterized by the above-mentioned. 3. A bearing case in which a sleeve is fixed to a pump main shaft, and is arranged at an outer peripheral position of the sleeve; and a plurality of segment-shaped guide bearings arranged along the circumferential direction between the bearing case and the sleeve. In a segment type bearing device provided with an oil tank for storing a lubricating liquid for the bearing, the lubricating liquid is non-volatile, has a specific gravity higher than that of a foreign substance such as stone, and has a property of being separated from a pumping liquid. A segment type bearing device characterized by the above-mentioned. 4. A thrust block is fixed to a pump main shaft, a bearing case disposed at an outer peripheral position of the thrust block, and a plurality of segment-shaped guides disposed circumferentially between the bearing case and the thrust block. In a segment-type bearing device provided with a bearing, a collar attached to the lower surface of the thrust block, a plurality of pad-type thrust bearings disposed opposite to the collar, and an oil tank for storing a lubricating fluid for these bearings, Non-volatile,
A segment type bearing device characterized by using a liquid having a higher specific gravity than a pump pumping liquid. 5. A thrust block is fixed to a pump main shaft, and a bearing case is provided at an outer peripheral position of the thrust block, and a plurality of segment-shaped guides are provided between the bearing case and the thrust block along a circumferential direction. In a segment-type bearing device provided with a bearing, a collar attached to the lower surface of the thrust block, a plurality of pad-type thrust bearings disposed opposite to the collar, and an oil tank for storing a lubricating fluid for these bearings, Non-volatile,
A segment type bearing device characterized by using a liquid having a specific gravity higher than that of a pumped liquid and having a characteristic of being separated from the pumped liquid. 6. A thrust block is fixed to a pump main shaft, a bearing case disposed at an outer peripheral position of the thrust block, and a plurality of segment-shaped guides disposed circumferentially between the bearing case and the thrust block. In a segment-type bearing device provided with a bearing, a collar attached to the lower surface of the thrust block, a plurality of pad-type thrust bearings disposed opposite to the collar, and an oil tank for storing a lubricating fluid for these bearings, Non-volatile,
A segment type bearing device characterized by using a liquid having a specific gravity higher than that of a foreign substance such as a stone and having a property of separating from a pumping liquid. 7. A pump main shaft, a blade fixed to a lower portion of the pump main shaft, a pump casing through which the pump main shaft is inserted, and a water flow passage formed therein, and mounted at a position higher than the pump casing. A pump having a segment type bearing device rotatably supporting a pump main shaft, wherein the segment type bearing device has a sleeve fixed to the pump main shaft, and is arranged at an outer peripheral position of the sleeve; And a plurality of segment-shaped guide bearings disposed circumferentially between the sleeves, and an oil tank for storing a lubricating fluid for the bearings, wherein the lubricating fluid is non-volatile and has a specific gravity higher than that of the pump pumping fluid. A vertical shaft drain pump characterized by using a liquid. 8. A pump main shaft, a blade fixed to the lower portion of the pump main shaft, a pump casing through which the pump main shaft is inserted, and a water flow passage formed therein, and mounted at a position higher than the pump casing. A segment-type bearing device rotatably supporting the pump main shaft, wherein the segment-type bearing device has a sleeve fixed to the main shaft, and a bearing case disposed at an outer peripheral position of the sleeve; A plurality of segment-shaped guide bearings disposed along the circumferential direction between the sleeves, and an oil tank for storing a lubricating liquid for the bearings, the lubricating liquid is non-volatile, and has a specific gravity higher than that of the pumping liquid, A vertical drainage pump characterized in that a liquid having a characteristic of being separated from a pumping liquid is used. 9. A pump main shaft, a blade fixed to a lower portion of the pump main shaft, a pump casing through which the pump main shaft is inserted and a water flow passage formed therein, and a pump casing mounted above the pump casing. A pump having a segment type bearing device rotatably supporting a pump main shaft, wherein the segment type bearing device has a sleeve fixed to the pump main shaft, and is arranged at an outer peripheral position of the sleeve; And a plurality of segment-shaped guide bearings arranged along the circumferential direction between the sleeves, and an oil tank for storing a lubricating fluid for the bearings. The lubricating fluid is non-volatile and has a specific gravity higher than that of a foreign substance such as stone. A vertical shaft drain pump characterized by using a liquid having a characteristic of being separated from a pumping liquid. 10. A pump main shaft, a blade fixed to a lower portion of the pump main shaft, a pump casing through which the pump main shaft is inserted, and a water flow passage formed therein, and mounted above the pump casing. In the pump having a segment type bearing device rotatably supporting the pump main shaft, the segment type bearing device has a thrust block fixed to the pump main shaft, and a bearing case arranged at an outer peripheral position of the thrust block, A plurality of segment-shaped guide bearings arranged in the circumferential direction between the bearing case and the thrust block, a collar attached to the lower surface of the thrust block, and a plurality of pad-type thrust bearings arranged to face the collar; An oil tank for storing a lubricating fluid for these bearings is provided, and is non-volatile to the lubricating fluid, and has a higher ratio than a pump pumping fluid. Vertical shaft drainage pump, characterized by being configured to use a liquid that is. 11. A pump main shaft, a blade fixed to the lower portion of the pump main shaft, a pump casing through which the pump main shaft is inserted, and a water flow passage formed therein, and mounted above the pump casing. In the pump having a segment type bearing device rotatably supporting the pump main shaft, the segment type bearing device has a thrust block fixed to the pump main shaft, and a bearing case arranged at an outer peripheral position of the thrust block, A plurality of segment-shaped guide bearings arranged in the circumferential direction between the bearing case and the thrust block, a collar attached to the lower surface of the thrust block, and a plurality of pad-type thrust bearings arranged to face the collar; An oil tank for storing a lubricating fluid for these bearings is provided, and is non-volatile to the lubricating fluid, and has a higher ratio than a pump pumping fluid. Vertical shaft drainage pump, wherein a located, and configured to use a liquid having a property to separate the pumped liquid. 12. A pump main shaft, a blade fixed to the lower portion of the pump main shaft, a pump casing through which the pump main shaft is inserted, and a water flow passage formed therein, and mounted above the pump casing. In the pump having a segment type bearing device rotatably supporting the pump main shaft, the segment type bearing device has a thrust block fixed to the pump main shaft, and a bearing case arranged at an outer peripheral position of the thrust block, A plurality of segment-shaped guide bearings arranged in the circumferential direction between the bearing case and the thrust block, a collar attached to the lower surface of the thrust block, and a plurality of pad-type thrust bearings arranged to face the collar; An oil tank for storing a lubricating liquid for these bearings is provided, and the lubricating liquid is non-volatile and has a higher ratio than foreign substances such as stones. Vertical shaft drainage pump, wherein a located, and configured to use a liquid having a property to separate the pumped liquid. 13. The segment type bearing device according to claim 1, wherein the specific gravity of the lubricating liquid is one or more liquids.