CN201478909U

CN201478909U - Semidry submersible motor

Info

Publication number: CN201478909U
Application number: CN2009201664945U
Authority: CN
Inventors: 陈文书; 陆伟刚; 王仙萍; 张德胜
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2009-07-24
Filing date: 2009-07-24
Publication date: 2010-05-19
Anticipated expiration: 2019-07-24

Abstract

The utility model provides a semidry submersible motor using small insulating cooling liquid to cool stator windings, which can have the advantages of low produce cost, low motor temperature rate, high motor efficiency and no water source pollution. Because the added insulating cooling liquid is only one third as much as the volume of the inner chamber of the semidry submersible motor, the semidry submersible motor is different from a underwater submersible motor and a under oil submersible motor which are filled with water or oil, and is also different from a dry submersible motor. Right amount of insulating cooling liquid is injected into a shell of a dry submersible motor with a metal shell, and the liquid surface is basically flat to the lower end surfaces of a stator iron core and a rotor iron core. By applying to the technology of the utility model, the injection amount of the insulating cooling liquid is less, and the cost is one second as much as that of insulating oil of the under oil submersible motor, but the cooling effect for the stator windings and the rotor windings of the semidry submersible motor is better than that of the under oil submersible motor.

Description

A kind of half-dried type submersible motor

Affiliated technical field

The utility model relates to a kind of submersible motor, in particular for the necessary electromotor of submersible pump, belongs to technical field of motors.

Background technology

Present known submersible motor mainly contains following four kinds:

1. dry-type submersible motor:

Its motor stator and rotor and motor internal and ground common electric machine are basic identical, and different is that motor internal is close airtight with the outside, and there is the axle envelope at its shaft extension place.Its advantage be simple in structure, production cost is low, its shortcoming is that cooling condition is bad, electric machine temperature rise is higher, and the easy polluted source of axle envelope of grease chamber is arranged, the axle envelope of no grease chamber is damaged easily and is intake, and causes motor to burn out.

2. immersion type submersible motor:

Its motor internal is full of clear water, and what its electromagnetic wire was used is the waterproof nylon electromagnetic wire.Its advantage be seal easily, polluted source and cooling condition are not good, its shortcoming is that stock utilization is low, the stator built-in line difficulty is big and electric efficiency is low.

3. oil immersed type submersible motor:

Its motor internal is full of insulating oil.Its advantage be the sealing than be easier to and cooling condition better, its shortcoming is that easy polluted source and electric efficiency are low.

4. protected type submersible motor:

Its stator core and stator winding are sealed with nonmagnetic substance, can not influence the insulation property of motor when motor is turned round in water.Its advantage is that electromagnetic wire is among the reliable static seal and polluted source not, and its shortcoming is that manufacture difficulty is very big, and production cost is very high.

In sum, all there is certain defective in present known submersible motor, some electric machine temperature rise height, and some envelope is damaged easily, is destroyed electrical machine insulation easily, and some electric efficiency is low, and some manufacture difficulty is very big, and production cost is very high, also some easy polluted source.

Patent of invention " hot well submersible motor " is exactly a kind of oil immersed type submersible motor (ZL200310017830.4), and its shortcoming is that easy polluted source and electric efficiency are low.

Summary of the invention

In order to remedy the defective of existing submersible motor, the utility model provides a kind of a small amount of insulating and cooling liquid of injecting in dry-type submersible motor, the half-dried type submersible motor of cooling stator winding can reach that production cost is low, electric machine temperature rise is low, electric efficiency is high and the beneficial effect of polluted source not.Because the insulating and cooling liquid that adds has only about 1/3 of motor cavity volume, so being different from, it is full of water or oil-overflow immersion type submersible motor and oil immersed type submersible motor, also be different from dry-type submersible motor, and be called half-dried type submersible motor.

The technical solution of the utility model is:

In the casing of the dry-type submersible motor of common metal casing, inject the proper insulating cooling fluid, its key is: the quantity of the insulating and cooling liquid of injection, its liquid level is concordant substantially with the lower surface of stator and rotor iron core.

The insulating and cooling liquid of injecting can be a cooling cream, also can be other cooling fluids, cooling cream be a kind of condensing temperature than higher insulating and cooling liquid, water insoluble at normal temperatures in the pasty state, when being higher than 40 ℃, melting and be liquid, good flowability and cooling performance are arranged.When liquefaction cooling cream fall into the normal temperature clear water, it can be condensed into solid, can't see oil bloom on the water surface.

Adopt the utility model technology, the insulating and cooling liquid quantity of injection seldom, its cost has only the insulating oil cost about 1/2 of oil immersed type motor, but the cooling effect of motor stator and rotor winding but is higher than the oil immersed type motor.Because the internal thermal resistance of motor stator and rotor winding is little, heat conduction is fast, as long as a part that contacts with insulating and cooling liquid has cooled down, other parts also can and then cool down.And, its rotor major part is still in air, can be as the oil immersed type motor, because driving the fluid high speed rotating, rotor additionally increases power consumption, increase the heat that motor sends, so its electric machine temperature rise is lower than the oil immersed type motor, its electric efficiency is also because the resistance of temperature rise reduction, motor stator and rotor winding reduces and improves.

The beneficial effects of the utility model are, low cost of manufacture, electric machine temperature rise are low, and electric efficiency is higher than oil immersed type motor and immersion type motor, and the water source is not had pollution.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the half-dried type submersible motor schematic diagram of an embodiment of the utility model.

1. stator and rotor gaps among the figure, 2. stator core, 3. metal chassis, 4. stator winding bottom, 5. axle seals, and 6. rotor core contains the rotor winding, and 7. rotor end ring is the end of rotor winding, 8. the liquid level of insulating and cooling liquid, 9. insulating and cooling liquid, 10. insulating and cooling liquid hand-hole.

Embodiment

In the submersible motor embodiment of Fig. 1, the liquid level 8 of insulating and cooling liquid is concordant substantially with the lower surface of stator core 2 and rotor core 6, stator winding bottom 4 and rotor end ring are that the end 7 of rotor winding is immersed in the insulating and cooling liquid 9, the major part of stator and rotor gap 1 and rotor is exposed in the air, the metal chassis 3 of sealing and axle envelope 5 can be kept at insulating and cooling liquid 9 in the metal chassis 3, insulating and cooling liquid 9 is injected from insulating and cooling liquid hand-hole 10, also can change insulating and cooling liquid from insulating and cooling liquid hand-hole 10 later on.

What insulating and cooling liquid was used in this embodiment is cooling cream, before submersible motor starts, insulating and cooling liquid at normal temperatures in the pasty state, after submersible motor starts, temperature in the motor is elevated to rapidly more than 40 ℃, and insulating and cooling liquid absorbs heat and melts and is liquid, under the rotation of rotor is stirred, insulating and cooling liquid is taken the heat of motor internal to the metal chassis inner surface, is dispersed in the liquid of submersible motor outside by metal chassis again.Because insulating and cooling liquid is stronger than the cooling capacity of insulating oil, and the rotor of present embodiment is to turn round in air, the loss power of rotor is less than the rotor loss power of oil immersed type motor, so the electric machine temperature rise of present embodiment is lower, electric efficiency is than higher.

Claims

1. half-dried type submersible motor, it is in the casing of general dry-type submersible motor, injects the proper insulating cooling fluid, it is characterized in that: the quantity of the insulating and cooling liquid of injection, its liquid level is concordant substantially with the lower surface of stator and rotor iron core.