CN205304432U - Liquid electric motor rotor dives - Google Patents

Abstract

The utility model provides a submersible motor rotor, which includes a rotor core and a cast copper squirrel cage. The rotor core is a cylinder, the cylinder is provided with a central shaft hole, and the inner edge of the rotor core is provided with a liquid guide hole. A rotor groove is provided on the outer edge of the rotor core; the cast copper squirrel cage includes two end rings and a plurality of guide bars, the two ends of the guide bars are respectively connected to the two end rings, and the end rings They are respectively located at two ends of the rotor core, and the guide bars pass through the rotor slots. The beneficial effects of the utility model are: the submersible motor adopting the rotor is installed in the low-temperature submersible pump, and the unique liquid guiding channel of the rotor can effectively reduce the flow resistance of the low-temperature liquid, improve the conveying efficiency, and help to improve the cooling of the motor. The effect is to increase the power density of the motor.

Description

A submersible motor rotor

technical field

The utility model belongs to the field of motors, in particular to a submersible motor rotor.

Background technique

In recent years, natural gas, as a clean energy, has been used more and more in countries around the world, and liquefied natural gas (LNG) is usually transported by LNG pumps. Due to the flammability of natural gas and the low temperature (-161°C) characteristics of LNG, in order to ensure the safety of the pump body system, LNG pumps generally adopt a submersible structure, that is, the motor used in the LNG pump is immersed in low temperature LNG to work. As the core component of the LNG pump, the cryogenic submersible motor directly affects the working characteristics of the LNG pump.

At present, the cast aluminum squirrel-cage rotor commonly used in low-temperature submersible motors on the market has low structural rigidity and poor reliability. Since the electrical conductivity of aluminum is worse than that of copper, under the same operating conditions, the cast aluminum rotor will generate more heat, which will easily cause local gasification of the LNG liquid and cause cavitation. In addition, since there is no liquid guide channel on the rotor, the flow resistance of LNG liquid is large, and the transmission efficiency is low. Moreover, the rotor of the motor cannot be effectively cooled, the temperature of the rotor rises, the loss of the rotor is large, and the operating efficiency of the motor is low.

Contents of the invention

In view of this, the utility model aims to propose a submersible motor rotor.

The technical scheme of the utility model is achieved in that:

A submersible motor rotor, comprising a rotor core and a cast copper squirrel cage, the rotor core is a cylinder, the cylinder is provided with a central shaft hole, the inner edge of the rotor core is provided with a number of liquid guide holes, the rotor There are several rotor slots on the outer edge of the core;

The cast copper squirrel cage includes two end rings and several guide bars, the two ends of the guide bars are respectively connected to the two end rings, the end rings are respectively located at the two ends of the rotor core, and the guide bars The bars pass through the rotor slots.

Further, the cross-section of the liquid guiding hole is circular or oval.

Further, the rotor slot is an open slot or a closed slot.

Further, the cross section of the rotor slot is a trapezoidal structure.

Further, the trapezoidal structure is wide on the outside and narrow on the inside.

Further, copper liquid is filled in the rotor slot.

Further, the end ring and the guide bar are cast copper structures, which are connected as a whole by die-casting.

Further, the rotor of the submersible motor is used for a submersible motor and installed in a cryogenic submersible pump.

The advantages and positive effects that the utility model has are:

1. The guide bars and end rings of the utility model are made of cast copper material, and are molded by die-casting using a copper casting process, which can effectively increase the stiffness and reliability of the motor rotor, reduce rotor loss and rotor heating, and improve the motor's operating performance;

2. The utility model utilizes the trapezoidal structure of the rotor slot, which can make the rotor current more uniformly distributed in the entire cross-sectional area of the bar, effectively reduce the influence of the skin effect on the current of the rotor bar of the frequency conversion motor, and improve the utilization rate and efficiency of the rotor bar. motor efficiency;

3. The submersible motor using this rotor is installed in the cryogenic submersible pump. The unique liquid guide channel of the rotor can effectively reduce the flow resistance of the cryogenic liquid, improve the delivery efficiency, and help to improve the cooling effect of the motor and increase the power of the motor density.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description It is only an embodiment of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creative work.

Fig. 1 is the top view of the utility model;

Fig. 2 is the front view of the utility model.

In the picture:

1. Rotor core 2. Rotor slot 3. Central shaft hole 4. End ring

5. Liquid guide hole 6. Guide bar

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

As shown in Figures 1 and 2, the utility model includes a rotor core 1 and a cast copper squirrel cage, the rotor core 1 is a cylinder, the cylinder is provided with a central shaft hole 3, and the inner edge of the rotor core 1 is provided with There are 6 liquid guiding holes 5 with a circular cross section distributed along the circumference of the central axis hole 3, and 26 closed rotor slots 2 distributed along the circumference of the central axis hole 3 ( The quantity used is determined according to the performance requirements of the submersible motor using the scheme); the cross section of the rotor slot 2 is a trapezoidal structure with a wide outside and a narrow inside, and the inside is filled with copper liquid.

The cast copper squirrel cage is formed by die-casting connection of several cast copper guide bars 6 and two cast copper end rings 4, the two ends of the guide bars 6 are respectively connected with the two end rings 4, and the end rings 4 They are located at both ends of the rotor core 1 and are in close contact with the rotor core 1 , and the guide bars 6 pass through the rotor slots 2 .

The rotor of the submersible motor is used for the submersible motor and is installed in the cryogenic submersible pump. The rotor of the submersible motor has high efficiency, strong versatility, good reliability, good cooling effect and superior frequency conversion performance. The specific effect is as follows:

1. The guide bars and end rings of the utility model are made of cast copper material, and are molded by die-casting using a copper casting process, which can effectively increase the stiffness and reliability of the motor rotor, reduce rotor loss and rotor heating, and improve the motor's operating performance;

2. The utility model utilizes the trapezoidal structure of the rotor slot, which can make the rotor current more uniformly distributed in the entire cross-sectional area of the bar, effectively reduce the influence of the skin effect on the current of the rotor bar of the frequency conversion motor, and improve the utilization rate and efficiency of the rotor bar. motor efficiency;

3. The submersible motor using the rotor is installed in the cryogenic submersible pump. The unique liquid guide channel of the rotor can effectively reduce the flow resistance of the cryogenic liquid, improve the delivery efficiency, and help to improve the cooling effect of the motor and increase the power density of the motor .

The embodiments of the present utility model have been described in detail above, but the content described is only a preferred embodiment of the present utility model, and cannot be considered as limiting the implementation scope of the present utility model. All equal changes and improvements made according to the application scope of the utility model should still belong to the scope covered by the patent of the utility model.

Claims (8)

1. a submersible motor rotor, comprising a rotor iron core (1) and a cast copper squirrel cage, characterized in that: the rotor iron core (1) is a cylinder, and the cylinder is provided with a center shaft hole (3), so The inner edge of the rotor core (1) is provided with a number of liquid guide holes (5), and the outer edge of the rotor iron core (1) is provided with a number of rotor grooves (2); Described cast copper squirrel cage comprises two end rings (4) and some guide bars (6), and the two ends of described guide bars (6) are connected with two described end rings (4) respectively, and described end rings ( 4) Located at both ends of the rotor core (1), the guide bars (6) pass through the rotor slots (2). 2. The submersible motor rotor according to claim 1, characterized in that: the cross-section of the liquid guide hole (5) is circular or elliptical. 3. The submersible motor rotor according to claim 1 or 2, characterized in that: the rotor slot (2) is an open slot or a closed slot. 4. The submersible motor rotor according to claim 3, characterized in that: the cross section of the rotor slot (2) is a trapezoidal structure. 5. The submersible motor rotor according to claim 4, characterized in that: the trapezoidal structure is wide on the outside and narrow on the inside. 6. The submersible motor rotor according to claim 1 or 2, characterized in that: said rotor slot (2) is filled with copper liquid. 7. The submersible motor rotor according to claim 1 or 2, characterized in that: the end ring (4) and the guide bar (6) are cast copper structures, connected as a whole by die-casting. 8. The submersible motor rotor according to claim 1 or 2, characterized in that: the submersible motor rotor is used for a submersible motor and installed in a cryogenic submersible pump.