JPH06346887A - Horizontal pump - Google Patents

Abstract

PURPOSE:To enable stand-by operation in the atmospheric air without putting water in a pump casing. CONSTITUTION:A horizontal shaft 5 is disposed piercing an intake elbow 4 connected to one end of a pump casing 1, and one end part of the horizontal shaft 5 is supported by a sliding bearing inside the pump casing 1. The horizontal shaft through part of the intake elbow 4 is provided with an oil seal 11, and a bearing case 8 for supporting the other end of the horizontal shaft 5 outside of the pump casing 1 is equipped with a pumping ring. A circulating passage 21 is further provided to feed lubricating oil in the bearing case 8 discharged by the pumping ring, to the sliding bearing and the oil seal 11 and then to return it to the bearing case 8 for circulation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal pump which discharges water pumped from below in a lateral direction.

[0002]

2. Description of the Related Art A horizontal pump of this type has a suction elbow 4 connected to the inlet 2 of a pump casing 1 having an inlet 2 and an outlet 3 opened in the lateral direction, as shown in FIG. A horizontal shaft 5 is provided so as to extend through the suction elbow 4 and extend inside and outside the pump casing 1, and one end of the horizontal shaft 5 on the side having the impeller 6 is connected to the pump casing 1
A thrust bearing 9 as a rolling bearing and a self-adjusting bearing in a bearing case 8 in which the other end of the horizontal shaft 5 is fixed to the outside of the suction elbow 4 while being supported by an underwater bearing 7 as a slide bearing provided therein. Water is sucked into the suction elbow 4 by supporting it on the core roller bearing 10 and providing an oil seal 11 on the horizontal shaft penetrating portion of the suction elbow 4 and driving the horizontal shaft 5 to rotate the impeller 6. It is designed to be discharged from the outlet 3 through the inside of the pump casing 1. In the figure, 12 is a flinger mounted near the bearing case 8 of the horizontal shaft 5, 13 is a coupling for connecting to a motor, and 14 is a pump casing 1 via a rim 15 or the like.
The submerged bearing retainer is fixed at the inner shaft position, 16 is a casing liner, 17 is a suction pipe, and 18 is a discharge pipe.

The horizontal pump is used, for example, by installing the suction pipe 17 at a position above the water surface so that the suction pipe 17 is submerged in the water channel. Therefore, when the water level in the water channel reaches a predetermined rising level, the vacuum pump attached is operated by the signal from the sensor to guide the water into the pump casing 1 through the separately provided water supply pipe. After the water is filled with water, the horizontal shaft 5 is driven to rotate the impeller 6 to start the operation, and when the operation sucks the water in the waterway and lowers the water level in the waterway. The operation is stopped by sucking in air.When the water level rises while the pump is stopped, the vacuum pump is operated to fill the water between the water channel and the pump as described above. Will be operated type pump is started, are to automatically and stops repeatedly driving.

[0004]

However, recently, in the above horizontal pump, a standby operation in a state where there is no water in the pump casing 1 has been required. However, as described above, since the present pump always starts up the pump casing 1 with a vacuum pump to make the inside of the pump casing 1 negative pressure before starting the pump before starting,
Since the bearing in the pump casing 1 that supports one end of the horizontal shaft 5 is a submersible bearing 7 designed to be operated in the presence of water, it cannot be operated in a water-free state. Is the reality.

That is, the above-mentioned submersible bearing 7 is normally arranged as shown in FIG.
Such as water-lubricated bearings that use ceramic bearings or sliding bearings that regularly inject grease when the horizontal shaft 5 rotates.
As one type of bearing is being used,
When the standby operation is performed, the former has insufficient lubrication and the latter has insufficient cooling, which causes a problem such as seizure.

[0006] Therefore, the present invention, without pumping self water,
It is intended to lubricate the bearings in the pump casing and enable standby operation in the atmosphere.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is designed so that a suction elbow is connected to one end of a pump casing, and the suction elbow is passed through the middle thereof and extends inside and outside the pump casing. A bearing case in which one end of the arranged horizontal shaft is supported by a plain bearing provided in the pump casing, an impeller is attached to the one end, and the other end of the horizontal shaft is fixed to the outside of the suction elbow. In a horizontal bearing having a horizontal shaft penetrating portion of the suction elbow, the pumping ring for discharging the lubricating oil in the bearing case on the horizontal shaft. And supplying the lubricating oil discharged by the pumping ring to the above-mentioned oil seal and sliding bearing in addition to its own bearing, and then again into the bearing case. A structure formed by providing a circulation passage for circulating the Suyo.

Further, on the horizontal axis, a forced air cooling fan which also serves as a flinger for blowing air is provided on the outer peripheral portion of the bearing case, and a part of the circulation passage is wound around the outer peripheral portion of the bearing case to be forced. It can be used as a cooler and can be a self-contained pump that does not require any auxiliary equipment to operate the pump, with a structure in which radiation fins are attached to part of the circulation passage, and it can contribute to the improvement of reliability as a pump plant. .

[0009]

When the horizontal axis is driven, the pumping ring is rotated, so that the lubricating oil in the bearing case is discharged into the circulation passage and supplied to the slide bearing in the pump casing, and further through the circulation passage to the bearing case. Since it is returned to the inside and circulated, the lubrication state of the slide bearing and the like is maintained. Therefore, standby operation in the atmosphere becomes possible.

Further, if a forced cooling section that is cooled by a forced cooling fan is provided in a part of the circulation passage, or if a radiating fin is provided to allow natural cooling, the cooled lubricating oil is applied to a slide bearing or the like. It is possible to supply it, and it becomes possible to carry out standby operation for a long time.

[0011]

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

FIGS. 1 to 3 show an embodiment of the present invention. In a horizontal pump having the same structure as shown in FIG. 4, it is adjacent to a thrust bearing 9 of a horizontal shaft 5 located in a bearing case 8. Is equipped with a pumping ring (small direct coupling oil pump) 20 for discharging the lubricating oil 19 stored in the bottom portion of the bearing case 8 to the outside by rotating integrally with the horizontal shaft 5. In addition, the lubricating oil 19 discharged by the pumping ring 20 is a thrust bearing 9 which is a rolling bearing in the bearing case 8, a self-aligning roller bearing 10, an oil seal 11 in a horizontal axis penetrating portion of the suction elbow 4, and a pump. A supply path 21A for supplying to each of the submerged bearings 7 which are sliding bearings in the casing 1,
A circulation passage 21 including a return passage 21B for returning the lubricating oil 19 supplied to the submersible bearing 7 and the like back into the bearing case 8 for circulation is provided.

Further, a forced air cooling fan 23 which also functions as a flinger is constructed by attaching a fan to a flinger 12 mounted on the horizontal shaft 5 in the vicinity of the bearing case 8 and sending the air 22 outward. A guide 24 for guiding the wind 22 sent by the forced air cooling fan 23 to the outer peripheral portion of the bearing case 8 is attached to the bearing case 8, and further,
The circulation passage 21 is provided on the outer peripheral portion of the bearing case 8 so as to be cooled by the wind 22 guided along the guide 24.
Part of the supply path 21A of the
1a.

In FIGS. 2 and 3, reference numeral 25 is a lubricating oil 1 which is made to flow by the rotation of the pumping ring 20.
9 shows an auxiliary plate that regulates 9 so that it is guided to the supply start end portion 21b of the circulation passage 21.

When the horizontal shaft 5 is driven, the pumping ring 20 is rotated integrally with the horizontal shaft 5 in the bearing case 8. Therefore, the pumping action of the pumping ring 20 causes the lubrication stored in the bottom of the bearing case 8. The oil 19 is fed into the supply passage 21A of the circulation passage 21. Therefore, the lubricating oil 19 passes through the supply passage 21A and the thrust bearing 9 and the self-aligning roller bearing 10 in the bearing case 8 are provided.
And the oil seal 11 of the suction elbow 4 and the submersible bearing 7 in the pump casing 1. Furthermore,
The lubricating oil 19 after being supplied to the submersible bearing 7 and the like is returned to the bearing case 8 through the return passage 21B of the circulation passage 21 and is circulated.

In this way, the pumping ring 20 is rotated in accordance with the rotation of the horizontal shaft 5, so that the lubricating oil 19 in the bearing case 8 is not only located in the bearing portion outside the pump casing 1, but also in the pump casing 1. Since the water is also circulated and supplied to the submerged bearing 7 and the oil seal 11, the standby operation can be performed even when the pump casing 1 has no water. At startup, the inner and outer bearings are submerged in oil, but the outer bearings are pumped out to the outside when the operation is started, and the oil level is lowered to the minimum level required for lubrication. Therefore, the heat generation amount of the bearing is suppressed from deterioration of the lubricating oil.

Further, in the above description, a part of the supply passage 21A of the circulation passage 21 is provided at the outer peripheral portion of the bearing case 8 with the forced cooling portion 21.
The lubricating oil 19 is cooled by passing through the forced cooling unit 21a because it is wound as a and the wind 22 generated by the forced air cooling fan 23 can be sent to the forced cooling unit 21a. In this state, it is supplied to the submersible bearing 7 and the like. Therefore, the above standby operation can be stably performed for a long time.

In the above embodiment, in order to cool the lubricating oil 19, the forced cooling section 21 by the forced air cooling fan 23 is used.
Although the case where a is provided is shown, in place of the forced cooling unit 21a, for example, as shown by a dashed line in FIG. It may be allowed to cool down, or the forced cooling part 21a and the heat radiation fins 21c may be provided side by side. Further, in the embodiment, one end of the horizontal shaft 5 is provided in the pump casing 1. Although the case where the submersible bearing 7 is used as the sliding bearing to be supported is shown, it goes without saying that a ceramic bearing may be used and other various changes may be made without departing from the scope of the present invention.

[0019]

As described above, according to the horizontal pump of the present invention, the pumping ring which rotates integrally with the horizontal shaft is provided inside the bearing case outside the pump casing, and the pumping action of this pumping ring causes the inside of the bearing case to move. The lubricating oil is supplied to the slide bearing in the pump casing and the oil seal in the horizontal shaft penetrating part through the circulation passage and circulated again, so that the horizontal shaft can be rotated without water in the pump casing. Even if the plain bearings can be lubricated with oil, standby operation can be performed without causing seizure, etc. on the plain bearings. By providing cooling fins for cooling, the cooled lubricating oil can be continuously supplied to sliding bearings, etc., so that standby operation can be stably performed for a long time. Can Ukoto, exhibit excellent effect and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a horizontal pump of the present invention.

FIG. 2 is an enlarged cross-sectional view of an external bearing portion that supports a horizontal shaft.

FIG. 3 is a view taken along the line AA of FIG.

FIG. 4 is a schematic diagram showing an example of a conventional horizontal pump.

[Explanation of symbols]

 1 Pump Casing 4 Suction Elbow 5 Horizontal Shaft 6 Impeller 7 Submersible Bearing (Sliding Bearing) 8 Bearing Case 9 Thrust Bearing (Rolling Bearing) 10 Self-Aligning Roller Bearing (Rolling Bearing) 11 Oil Seal 19 Lubricating Oil 20 Pumping Ring 21 Circulation Passage 21a Forced cooling unit 21c Radiating fin 23 Forced air cooling fan

Claims (3)

[Claims] 1. A pump casing is provided with one end of a horizontal shaft arranged so that a suction elbow is connected to one end of a pump casing, and the midway of the suction elbow is penetrated to extend inside and outside the pump casing. The impeller is attached to the slide bearing and an impeller is attached to the one end, and the other end of the horizontal shaft is attached to a rolling bearing in a bearing case fixed to the outside of the suction elbow, and the horizontal shaft is penetrated into the suction elbow. In a horizontal pump provided with an oil seal, a bearing case on the horizontal axis is equipped with a pumping ring for discharging the lubricating oil in the bearing case, and the lubricating oil discharged by the pumping ring is A horizontal pump characterized in that a circulation passage is provided to circulate the oil seal and the plain bearing after supplying the oil seal and the plain bearing again. 2. A forced cooling fan for blowing air is provided on the outer peripheral portion of the bearing case on the horizontal axis, and a part of the circulation passage is wound around the outer peripheral portion of the bearing case to form a forced cooling portion. The horizontal pump according to claim 1. 3. The horizontal pump according to claim 1, wherein a radiation fin is attached to a part of the circulation passage.