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Large submersible electric pump

A submersible electric pump, a large-scale technology, applied in the direction of pumps, pump devices, electromechanical devices, etc., can solve the problems of increasing diffusion loss, reducing air gap, crowding flow channels, etc., to improve anti-cavitation performance, increase power factor, The effect of improving efficiency

Inactive Publication Date: 2005-11-09
HEFEI HENGDAJIANGHAI PUMP IND CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

At the same time, the increase of the diameter of the motor will not only occupy the flow channel, but also make the guide vane angle of the guide vane body reach more than 25°, which increases the diffusion loss
[0003] A technical problem of large submersible motors is to reduce the temperature rise of the stator and rotor of the motor, especially the problem of the temperature rise of the rotor is difficult to solve. The temperature rise of the rotor will cause the thermal expansion of the rotor, and the consequence of the thermal expansion of the rotor will cause the reduction of the air gap, thus Serious accident caused by rubbing between stator and rotor

Method used

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Embodiment Construction

[0018] The primary task of the invention is to effectively control and reduce the temperature rise of the motor and the rotating parts of the supporting bearings during the working process.

[0019] The structure of the motor part is firstly described in detail below:

[0020] see figure 1 , the inside of the motor 10 is provided with a centrifugal fan 13 to adopt an air cooling cycle formed by forced air cooling, such as figure 1 The direction indicated by the arrow 16 in the figure forms an air-water cooling system with the water cooler 14 provided on the casing of the motor 10, which can effectively reduce the temperature rise of the stator; a spiral groove 151 is arranged on the surface of the rotor 15, and the A groove 151 with a large pitch is formed on the surface of 15, and its function is similar to that of a spiral fan. The pitch of the groove 151 is 0.1 to 0.2 times the diameter of the motor rotor 15. In order to increase its ventilation capacity, a rectangular thr...

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Abstract

This invention relates to a large diving pump to control the temperature rising of the stator and rotor effectively. An air-water cooling system formed by an air cooling circulation made up of centrifugal fans and a water cooler set at the shell is formed in the motor, which can effectively reduce the rising of the temperature of the stator windings. The plan for reducing the high rising temperature of the rotor is to form a surface trench of large pitch to play the role of a screw fan forcing the internal air to flow through the air space surface and bring away with the heat generated by the rotor to form an independent cooling system of rotor ventilation with the outer water cooler.

Description

technical field [0001] The submersible electric pump involved in the present invention is more specifically a large-scale submersible electric pump with planetary gear deceleration with a power of 250kW, a diameter of 1m and above, and a pump speed below 500r / min. Background technique [0002] In the prior art, the motor and the water pump in the large submersible electric pump are arranged coaxially. Based on the design principle that the linear velocity around the impeller of the water pump must maintain a specific constant, when the water pump develops to a larger size, the larger the diameter of the impeller of the water pump, the lower the rotational speed. For the motor, the lower the speed of the motor with the same power, the more poles it has, so the diameter of the motor is larger, the volume is larger, and the efficiency and power factor are lower. At the same time, the increase of the diameter of the motor will not only occupy the flow channel, but also make the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K9/06
Inventor 邓悌康周巧霞
Owner HEFEI HENGDAJIANGHAI PUMP IND CO LTD
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