JPH08294250A - Submerged motor - Google Patents

Abstract

PURPOSE: To prevent the drop of cooling effect of a radiator and eliminate surplus power facilities or cables by obviating a motor for circulation of cooling water. CONSTITUTION: In a submerged motor, to pump up water by the pump impeller and cools the frame 4 of itself with the whole or a part of the water, a radiator 10 is provided in the vicinity of the coil end of the motor, and a pump 15, which is coupled through the magnet shaft joint 12 provided at the shaft end on the antidrive side of the main shaft 11 of the submerged motor 11, is provided, and the pump 15 and the radiator 10 are connected by cooling pipes 9a and 9b passing through a cooling chamber 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersible motor, and more particularly to a submersible motor having a radiator near a motor coil end.

[0002]

2. Description of the Related Art The heat generated in the core of an underwater motor passes through a stator iron core and a frame, and is radiated to cooling water in contact with the outer surface of the frame. However, the heat-generating portion that is not in direct contact with the frame has a poor heat transfer efficiency and tends to generate high heat. In particular, the rotor that rotates in the motor / core chamber is completely isolated from the stator that transfers heat to the outside, and it is difficult for the heat to escape and to accumulate. Therefore, in order to positively remove the heat of the portion, it is necessary to provide a radiator near the end of the rotor core and introduce cooling water from the outside to circulate it. As a method of circulating this cooling water, (1) introducing the self-pressurized water of the pump, which hits the driven side of the motor, into the radiator and letting it escape to the pump side again to circulate the cooling water. (2) A small motor pump is provided in the middle of the loop-shaped cooling pipe to circulate the cooling water. Etc. are possible.

FIG. 3 is a sectional view showing a conventional underwater motor with a radiator attached to a water cooling jacket. In FIG. 3, reference numeral 20 is a pump casing, and the impeller 1 is rotatably accommodated in the pump casing 20. The cooling water pressurized in the rear shroud portion 1 a of the impeller 1 is part of the plurality of water passages 2 a of the intermediate casing 2.
Then, it is guided through a cooling pipe 3 to a water cooling chamber 6 formed by a motor frame 4 and a water cooling jacket 5. The cooling water in the water cooling chamber absorbs the heat of the core chamber 7 via the motor frame 4, passes through the intermediate casing 2 again, and returns to the rear shroud portion 1a of the impeller 1. Part of this circulating cooling water is discharged to the outside from the discharge pipe 8 above the water cooling jacket 5, and is partially replaced with pump water to prevent the temperature of the cooling water from rising.

On the other hand, the cooling water whose pressure has been increased in the rear shroud portion 1a of the impeller 1 is provided in another water passage 2 of the intermediate casing 2.
It is led to the radiator 10 through b and the cooling pipe 9a. The cooling water passing through the radiator 10 is the motor core chamber 7
Of the heat of the impeller 1, and returns to the rear shroud portion 1a of the impeller 1 through the cooling pipe 9b and the intermediate casing 2 again.

[0005]

[Problems to be Solved by the Invention] However, (1)
The above method, that is, the conventional submersible motor pump with a built-in radiator shown in FIG. 3 uses pumped water as cooling water for the radiator. Since ordinary submersible motor pumps handle rainwater, sewage and sewage, the contamination of pumping water used for cooling water adheres to the inner surface of the radiator and reduces the cooling effect, or the inside of the cooling pipe sticks to the cooling water flow. Could hinder the

Further, in order to avoid the above-mentioned problems, in the method (2) in which fresh water is used in the cooling system and a cooling water circulation motor pump is provided, extra equipment and cables for supplying power to the motor pump are required. However, it is not preferable in terms of price and complexity of local installation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an underwater motor capable of preventing a reduction in the cooling effect of a radiator and eliminating the need for a cooling water circulating motor and eliminating extra power supply equipment and cables. And

[0008]

In order to achieve the above-mentioned object, the present invention provides an underwater motor in which the motor frame is cooled by water or a part thereof pumped by a pump impeller driven by the underwater motor. , A radiator is provided in the vicinity of the motor / coil end, and a pump connected via a magnet shaft coupling provided at the shaft end on the opposite side of the main shaft of the submersible motor is provided to connect the pump and the radiator to the cooling water. It is characterized by being connected by a cooling pipe passing therethrough.

[0009]

According to the present invention, the pump can be driven at the shaft end of the motor main shaft opposite to the pump side via the magnet shaft coupling, and the cooling water guided to the radiator can be forcedly circulated to enhance the cooling effect. The cooling pipe connecting the pump and the radiator can be cooled with water outside the motor, and the heat inside the motor taken by the radiator can be released to the outside of the motor.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the underwater motor according to the present invention will be described below with reference to FIGS. FIG. 1 is a cross-sectional view showing the overall configuration of a pump device equipped with a submersible motor according to the present invention, and FIG. 2 is an enlarged cross-sectional view of the essential parts of FIG. 1 and 2
In FIG. 3, components having the same actions and functions as those of FIG. 3 will be described using the same reference numerals.

An impeller 1 is housed in the pump casing 20, and the impeller 1 is fixed to and supported by a main shaft 11. The intermediate casing 2 is connected to the upper portion of the casing 20, and the submersible motor is installed on the upper portion of the intermediate casing 2.

The submersible motor comprises a stator core 21, a stator coil and a rotor core 22 installed in the motor frame 4, and the rotor core 22 is integrally fixed to the main shaft 11. The main shaft 11 is rotatably supported by an upper bearing 16 and a lower bearing 17.

A water cooling jacket 5 is provided on the outer peripheral portion of the motor frame 4, and a water cooling chamber 6 is formed by the water cooling jacket 5 and the motor frame 4.
The radiator 10 is located above and below the motor and coil ends.
Is provided. Then, the cooling water is guided to the radiator 10 via the cooling pipes 9a and 9b.

On the other hand, a magnet shaft coupling 12 is provided on the upper end of the motor at the shaft end of the main shaft 11 opposite to the pump side. As shown in FIG. 2, the magnet shaft coupling 12 is composed of a drive side magnet 12a fixed to the main shaft 11 and a driven side magnet 12c fixed to the driven shaft 12b, and an impeller 13 at the tip of the driven shaft 12b. Is fixed. A casing 14 is provided so as to surround the impeller 13, and the impeller 13 and the casing 14 constitute a pump 15. The casing 14 is connected to the cooling pipe 9b through the suction pipe 16a, and
It is connected to the radiator 10 via b. That is, a closed loop for circulating fresh water is formed by the radiator 10, the cooling pipes 9a and 9b, the casing 14, and the suction pipes 16a and 16b.

Next, the operation of the underwater motor configured as described above will be described with reference to FIGS. 1 and 2. The impeller 1 is rotationally driven by the rotational driving of the submersible motor, and the cooling water whose pressure is increased by the rear shroud portion 1a of the impeller 1 passes through the water passage 2a of the intermediate casing 2 and is guided to the water cooling chamber 6. The cooling water in the water cooling chamber 6 is the motor cores 21 and 22.
And absorbs the heat generated in the coil, and then passes through the intermediate casing 2 again, and the rear shroud portion 1 of the impeller 1
Return to a.

Since the pump 15 is rotationally driven via the magnet shaft coupling 12 as the impeller 1 is rotationally driven, the cooling water is forcibly circulated in the radiator 10. And the cooling pipe 9 connecting the pump 15 and the radiator 10
a and 9b are cooled by the cooling water in the water cooling chamber 6 formed by the motor frame 4 and the water cooling jacket 5, and the radiator 10 is cooled.
The heat of the coil end and the rotor, etc., which has been taken away by is released to the outside of the motor. As described above, in the present embodiment, since the pump 15 connected to the radiator 10 is provided near the motor coil end and the pump 15 and the radiator 10 are connected by the cooling pipes 9a and 9b passing through the water cooling chamber 6,
As the cooling water supplied to the radiator 10, it is possible to use fresh water instead of the pump self-pressurized water.

[0017]

As described above, according to the present invention, the effects listed below can be obtained. (1) By using fresh water as the cooling water, it is possible to prevent a reduction in the cooling effect of the radiator. (2) By taking out the driving force of the cooling water circulation pump from the main shaft end of the submersible motor, the cooling water circulation motor becomes unnecessary and extra power supply equipment and cables can be deleted. (3) By connecting the main shaft end of the submersible motor and the cooling water circulation pump with a magnet shaft coupling, it is possible to prevent water from entering the core chamber of the dry motor as much as possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an underwater motor according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a cross-sectional view showing a conventional underwater motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impeller 2 Intermediate casing 4 Motor frame 5 Water cooling jacket 6 Water cooling chamber 7 Core chamber 9a, 9b Cooling pipe 10 Radiator 11 Main shaft 12 Magnet shaft coupling 12a Drive side magnet 12b Driven shaft 12c Driven side magnet 13 Impeller 14 Casing 15 Pump 20 Pump casing

Claims (2)

[Claims] 1. A submersible motor in which a motor frame is cooled by water or a part thereof pumped by a pump impeller driven by a submersible motor, a radiator is provided in the vicinity of a motor coil end, A submersible motor characterized in that a pump connected via a magnet shaft coupling provided at an opposite drive side shaft end of a main shaft is provided, and the pump and the radiator are connected by a cooling pipe passing through the cooling water. 2. The submersible motor according to claim 1, wherein the radiator is installed near one side or both sides of the motor coil end.