JP3079177B1 - Vertical pump - Google Patents

Abstract

A lubricating fluid is cooled and a smooth preceding standby operation is performed even with a simple and inexpensive configuration. SOLUTION: A lubricating liquid circulation path for circulating the lubricating liquid flowing out of a liquid storage tank 15 back to the liquid storage tank 15 via a lubricating liquid path 11, a lower shaft sealing device 13, and an upper bearing device 6 is formed. . The operation of the impeller 14 formed on the outer peripheral surface of the impeller shaft 5 generates a circulation flow of the lubricating liquid in the lubricating liquid circulation path. On the outer peripheral surface of the protection tube 10, a heat radiating portion 28 having a heat transfer capability exceeding the heat generation of the impeller 14, the bearing devices 6, 7, 9 and the shaft sealing devices 9, 12 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical pump generally used in a rainwater drainage pumping station.

[0002]

2. Description of the Related Art In recent years, in a metropolitan area, the amount of rainwater flowing into a rainwater drainage plant tends to increase due to local heavy rain due to heat islands and a decrease in rainwater absorption capacity of land due to asphalt of roads and the like. It is in. For this reason, a so-called preceding standby operation is performed in which the pump is caused to stand by in advance in an operation state in anticipation of a rainfall amount.

By the way, during the preliminary standby operation, the amount of rainwater flowing into the water tank is small, so that the dry operation is performed for a long time. Since the bearing device is formed of ceramics, resin, or the like, there is a possibility that the bearing device will be damaged by heat generated during dry operation. For this reason, the bearing device is cooled by a lubricating liquid (fresh water or lubricating oil) supplied from a liquid storage tank (Japanese Patent Application Laid-Open No. Hei 9-1997).
287590 and the like).

[0004]

However, in the conventional vertical shaft pump, even if the temperature of the lubricating fluid for cooling the bearing device rises, no consideration is given to cooling the lubricating fluid. In addition, providing a separate cooling device complicates the structure and increases the manufacturing cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vertical shaft pump capable of cooling the lubricating liquid and performing a smooth preliminary standby operation even with a simple and inexpensive configuration.

[0006]

According to the present invention, there is provided, as a means for solving the above-mentioned problems, an impeller shaft for rotating an impeller disposed below the inside of a pumping pipe, comprising an upper bearing device, an intermediate bearing device and a lower bearing. A lubricating fluid passage is formed by rotatably supporting the bearing by a bearing device, arranging a protective tube on the outer peripheral portion in the pumping pipe, and sealing with a upper shaft sealing device and a lower shaft sealing device. The lubricating fluid that circulates the lubricating fluid that has flowed out of the reservoir in the vertical pump that supplies the lubricating fluid from the reservoir to the reservoir via the lubricant passage, the lower shaft seal device and the upper bearing device A circulation path is formed, and by the action of the impeller formed on the outer peripheral surface of the impeller shaft, a circulation flow of the lubricating liquid in the lubricating liquid circulation path is generated.
A heat radiating portion having a heat transfer capacity exceeding a heat generation amount in the shaft sealing device and the bearing device is formed.

[0007] With this configuration, the heat generated in the bearing device and the like accompanying the rotation of the impeller is radiated to the lubricating liquid circulating in the lubricating liquid circulation path. While flowing down the lubricating liquid passage, the lubricating liquid is efficiently radiated through the heat radiating portion provided on the outer peripheral surface of the protection tube to lower the temperature.

[0008]

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

FIG. 1 shows a vertical shaft pump according to this embodiment. In this vertical shaft pump, the water sucked from the lower end suction port 3 is raised by the rotation of the impeller 2 provided inside the pumping pipe 1 and raised through the pumping pipe 1, through the upper bent portion (discharge elbow portion) 4. In the horizontal direction.

The impeller 2 is provided at the lower end of the impeller shaft 5. The upper end of the impeller shaft 5 that penetrates the bent portion 4 of the pumping pipe 1 has an upper bearing device 6.
In addition to being rotatably supported, the intermediate portion is rotatably supported by an intermediate bearing device 7 provided at the center of the pumping tube 1 and the lower end portion is supported by a lower bearing device 9 provided in a vane casing 8 of the pumping tube 1. Have been. Each of the bearing devices 6, 7, 9 is formed of ceramics or the like, and has a configuration in which a lubricating liquid described later can freely flow.

A portion of the impeller shaft 5 exposed to the pumping passage is covered with a protective tube 10. The protection tube 10
The lubricating liquid passage 11 is formed between the impeller shaft 5 and the impeller shaft 5, and the impeller shaft 5 is prevented from being damaged by foreign matter in pumping. The protection tube 10 is watertightly mounted between an upper shaft sealing device 12 provided at the bent portion 4 of the water pumping tube 1 and a lower shaft sealing device 13 provided inside the vane casing 8. A mechanical seal is used as the shaft sealing devices 12 and 13. Further, on the outer peripheral surface of the impeller shaft 5, a plurality of impellers 1
4 are formed. When the impeller shaft 5 rotates, the lubricating liquid in the lubricating liquid passage 11 flows down by the operation of the impeller 14.

A lubricating liquid is supplied to the lubricating liquid passage 11 from a liquid storage tank 15 provided above the pumping pipe 1. The liquid storage tank 15 and the upper bearing device 6 are connected by a first pipe 16. A filter 17 located in the liquid storage tank 15 is provided at one end of the first pipe 16. The upper bearing device 6 and the lower shaft sealing device 13 are connected by a second pipe 18. Upper part of protection tube 10 and liquid storage tank 15
Are connected by a third pipe 19. Thereby, the lubricating liquid discharged from the liquid storage tank 15 is supplied to the third pipe 19, the lubricating liquid path 11, the lower shaft sealing device 13, and the second pipe 1.
8. A lubricating liquid circulation path is formed that circulates back to the liquid storage tank 15 via the upper bearing device 6 and the first pipe 16.
A fourth pipe 20 communicating with the space above the pumping pipe 1 penetrates through the center of the bottom surface of the liquid storage tank 15. An automatic pressure regulation mechanism such as a bellows 22 or a piston is provided at the tip of the fourth pipe 20, and is located at the center of the liquid storage tank 15. A flexible tube 21 is provided in the middle of each of the pipes 16, 18, 19, 20.

The liquid storage tank 15 has a water level gauge 23, a liquid injection pipe 24, a lubricating liquid thermometer 25, a safety valve 26, and an exhaust valve 2.
7 are provided. In the present embodiment, when the water level gauge 23 detects that the lubricating liquid W in the closed liquid storage tank has become equal to or lower than the lowest reference value, the lubricating liquid W is injected from the liquid injection pipe 24 and reaches the highest reference value. The injection is stopped.

On the outer peripheral surface of the protective tube 10, a heat radiating portion 28 for promoting a heat transfer effect is formed. As the radiator 28, in addition to the fin 30 shown in FIG.
As shown in FIG. 2B, the outer surface of the protective tube 10 is corrugated, or the outer surface of the protective tube 10 is provided with a plurality of small diameter tubes 31 as shown in FIG. 2C. Can be adopted.
In short, it is only necessary that the heat radiation portion 28 be formed so that the heat radiation amount exceeds the total heat generation amount in the bearing device, the shaft sealing device, the impeller 2 and the like. Thereby, a self-cooling system can be obtained without requiring a special cooling device for cooling the lubricating liquid.

Next, the operation of the vertical shaft pump will be described.

Prior to an increase in the amount of rainwater flowing into the water tank based on a weather forecast or the like, a preliminary standby operation is started by transmitting power from a drive source (not shown) to the impeller shaft 5 to rotate the impeller 2. . By the operation of the impeller 14 accompanying the rotation of the impeller shaft 5, the lubricating fluid flows in the lubricating fluid passage 11 from above to below, and the lubricating fluid circulates in the lubricating fluid circulation passage.

When the impeller shaft 5 rotates, heat is generated in the bearing devices 6, 7, 9, the shaft sealing devices 12, 13, the impeller 14, and the like. This heat is radiated to the circulating lubricating liquid as described above. Therefore, even if the dry operation based on the preceding standby operation is performed for a long time, the heat generating portion does not become hot, and, for example, the bearing devices 6, 7, and 9 are prevented from burning or burning out. You. Further, when the lubricating liquid that has absorbed heat and rises in temperature passes through the lubricating liquid passage 11 formed between the protective tube 10 and the impeller shaft 5, the lubricating liquid passes through the heat radiating portion 28 formed on the outer peripheral surface of the protective tube 10. Heat is dissipated. Therefore, the temperature of the lubricating liquid drops sufficiently while flowing down the lubricating liquid passage 11, and there is no need to provide a separate cooling device.

Thereafter, when the rainfall increases, the rotation speed of the impeller 2 is increased, and water is sucked from the lower end suction port 3. The sucked water is pushed up by the pumping pipe 1 and is discharged in the horizontal direction through the upper bent portion (discharge elbow portion) 4.

During the operation of the pump, the water in the protection tube 10 is forcibly flowed down by the impeller 14, so that even if sand or the like is mixed in the liquid storage tank 15, these foreign substances are removed by the bearing devices 6, 7 , 9, abnormal wear of the bearing devices 6, 7, 9 and the impeller shaft 5 can be prevented.

The liquid storage tank 15 is installed on the same foundation as the pump body, and the liquid storage tank 15 and the protective tube 1
0 and the bent portion 4 are connected to each other by the pipes 16, 19, and 20 with the flexible tube 21 interposed therebetween.
And the liquid storage tank 15 becomes unusable.

[0021]

As is apparent from the above description, according to the vertical pump according to the present invention, since the heat radiating portion is provided on the outer peripheral surface of the protective tube, it is simple and inexpensive without requiring a separate cooling device. Even with such a configuration, the lubricating fluid can be sufficiently lowered in temperature and a smooth preceding standby operation can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vertical shaft pump according to the present embodiment.

FIG. 2 is a cross-sectional view showing various forms of a heat radiating unit in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pumping pipe 2 ... Impeller 3 ... Lower end suction port 4 ... Bending part 5 ... Impeller shaft 6 ... Upper bearing device 7 ... Intermediate bearing device 8 ... Vane casing 9 ... Lower bearing device 10 ... Protection tube 11 ... Lubricating fluid path 12 ... Upper shaft sealing device 13 Lower shaft sealing device 14 Impeller 15 Liquid storage tank 16 First pipe 28 Heat dissipating part 29 Fin 30 Small diameter pipe

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Kanemori 1-1-8 Miyatacho, Takatsuki City, Osaka Prefecture Inside Torishima Plant Co., Ltd. (72) Inventor Tsutomu Kotaki 1-1-8 Miyatacho, Takatsuki City, Osaka Prefecture No. In Torishima Manufacturing Co., Ltd. (56) References JP-A-9-287590 (JP, A) JP-A-11-324967 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04D 13/00 F04D 29/06 F04D 29/58

Claims (1)

(57) [Claims] An impeller shaft for rotating an impeller disposed below the inside of a pumping pipe is rotatably supported by an upper bearing device, an intermediate bearing device, and a lower bearing device, and is protected on an outer peripheral portion in the pumping tube. A vertical shaft pump for supplying a lubricating liquid from a liquid storage tank to a lubricating liquid path by forming a pipe and sealing with an upper shaft sealing device and a lower shaft sealing device, Forming a lubricating liquid circulation path for circulating the discharged lubricating liquid back to the liquid storage tank via the lubricating liquid path, the lower shaft sealing device and the upper bearing device, and forming an impeller shaft formed on the outer peripheral surface of the impeller shaft; By the action, a circulating flow of the lubricating liquid in the lubricating liquid circulation path is generated, and a heat radiating portion having a heat transfer capacity exceeding a heat generation amount in the impeller, the shaft seal device, and the bearing device is formed on the outer peripheral surface of the protective tube. Octopus And a vertical pump.