JPH0721082Y2 - Submersible motor pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a portable small-sized submersible motor pump, and more particularly to a bearing structure thereof.

2. Description of the Related Art Conventionally, the bearings of this type of submersible motor have been arranged on both sides of a rotor that generates torque. Therefore, when the continuous operation in the air is performed with the motor part exposed, the temperature of the bearing arranged above the rotor rises abnormally, and there is a drawback that it is damaged early.

In order to solve the conventional drawbacks, the present invention has a bearing arranged below a rotor which is also a heat generation source. The temperature of the bearing during pressing and air operation is transferred to the lubricating oil and water flowing through the pump section to suppress the temperature rise of the bearing.

Embodiment FIG. 1 is a vertical sectional view of an embodiment in which the present invention is applied to a single-phase submersible motor pump for drainage, and FIG. 2 is a view showing a main spindle unit part taken out. It is a phase induction motor.

In the figure, 1 is a condenser for operation, 2 is its binding band, 3 is an insulating plate, 4 is a spindle, 5 is a rotor, 6 is an upper bearing, 7 is a lower bearing, 8 is a bearing housing, 9 is a bearing retainer, and 10 Is a stator, 11 is a motor frame, 12 is a mechanical seal, 13 is an intermediate casing, 14 is an impeller,
15 is a casing, 16 is packing, 17 is a pump base, 18 is lubricating oil, 19 is an impeller fixing nut, 20 is a long bolt, 21
Indicates an underwater cable, and 22 indicates a handle. 4a is the main shaft 4
The pump shaft of the extension part of, and 9a indicate ribs for fixing the bearing housing.

A rotor 5 is attached to the upper end of the main shaft 4 by shrinkage fitting, and bearings 6 and 7 are attached to the main shaft 4 below the rotor 5. A rotor 5 and bearings 6 and 7 are attached to the main shaft 4 with a space therebetween. An assembly in which the rotor 5 and the bearings 6 and 7 are attached to the main spindle 4 is integrated into a bearing housing 8 as a main spindle unit fixed by a bearing retainer fitting 9. (FIG. 2) This main spindle unit is inserted into the motor frame 11 into which the stator 10 is press-fitted from below, and after the mechanical seal is attached, the rib 9a of the bearing housing is pressed and fixed by the intermediate casing 13. The impeller 14 is attached to the lower part of the main shaft via the key by the impeller fixing nut 19.
The pump casing 15 is fastened by a long bolt 20 together with a pump base 17 through a packing 16 formed so as to cover the head of the bolt fastening the intermediate casing 13.

When the pump is continuously operated in such a state that the motor part is exposed, the stator 10 and the rotor 5 remarkably generate heat, and the heat is transferred to the main shaft 4 and transferred to the bearings 6 and 7. The heat transmitted to the housing 8 and radiated to the lubricating oil 18 and the heat transmitted to the pump shaft 4a are radiated to the water flowing in the casing 15, so that the temperature rise of the bearings 6 and 7 can be suppressed to a minimum and the pump device Durability can be achieved. Further, the pump base 17 also has a strainer function.

FIG. 3 is another embodiment in which the motor is a three-phase induction motor, and FIG. 4 is a diagram showing the motor frame portion and the spindle unit portion separated from each other. The same reference numerals represent the same parts.

In the second embodiment, since the motor has three phases, the operating capacitor is eliminated and the wiring portion is different, but the other points are exactly the same as in the first embodiment.

Effect Since the submersible motor pump of the present invention has such a structure, it is possible to prevent the temperature of the bearing from rising and to improve the durability of the bearing and the like, and to consolidate the bearing housing that requires structural accuracy into one component. With this, quality control is easy and stable products can be supplied to the market.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment of a submersible motor pump according to the present invention, FIG. 2 is a diagram showing a main shaft unit taken out, and FIG. 3 is a vertical sectional view of the same second embodiment. FIG. 4 is a view showing the motor frame portion and the spindle unit separately. Explanation of symbols 1 ... Operating capacitor, 2 ... Binding band 3 ... Insulation plate, 4 ... Main shaft, 5 ... Rotor 6,7 ... Bearing, 8 ... Bearing housing 9 ... Bearing retainer, 10 ...... Stator 11 …… Motor frame, 12 …… Mechanical seal 13 …… Intermediate casing, 14 …… Impeller, 15 …… Casing 16 …… Packing, 17 …… Pump stand, 18 …… Lubricating oil 19 …… Vane Car fixing nut, 20 …… Long bolt 21 …… Underwater cable, 22 …… Grip

Claims (1)

[Scope of utility model registration request] 1. A drive motor, a shaft sealing device, and a pump. A bearing is attached to the central portion of the drive main shaft, and the rotor of the motor portion is arranged on one side with the bearing at the center and the other side. In the submersible motor pump for general drainage, in which an impeller, which is the pump part, is arranged via a mechanical seal that is a shaft sealing device, the bearing is fixed to the bearing housing by a bearing retainer and is unitized. At the same time, the bearing housing is fixed by being pressed against the motor frame by an intermediate casing which is a part of the pump portion.