Cooling structure for improving heat exchange effect of primary helium fan and reducing wind friction

Abstract

The invention discloses a cooling structure for improving the heat exchange effect of a primary helium fan and reducing wind friction consumption, which comprises a stator iron core and a rotor iron core, a plurality of rotor ventilation holes are formed in the rotor iron core around a rotor shaft in the axial direction of a rotor at equal radius and equal intervals, and the rotor ventilation holes penetrate through the rotor iron core to form a rotor air duct; a plurality of stator ventilation holes are formed in the stator iron core around the rotor shaft in the axial direction of the rotor at equal radius and equal intervals, and the stator ventilation holes penetrate through the stator iron core to form a stator air channel. Effective ventilation cooling of the driving motor of the primary helium fan can be achieved.

Description

Technical Field

[0001] The invention relates to a cooling structure used in the field of motor design and for improving the heat exchange effect of a main helium fan and reducing wind friction. Background Art

[0002] The main helium fan drive motor is a helium coolant circulation drive device for the primary circuit of a high-temperature gas-cooled reactor nuclear power plant, which relies on helium for ventilation and cooling. The main helium fan drive motor design should meet the operating requirements of the reactor and the main helium fan, and should be able to ensure the safe and reliable operation of the main helium fan during commissioning, startup, and the operating range of 20%-105% of the rated speed. Under rated operating conditions, the main helium fan drive motor should be able to operate within the motor cooler water cut-off time specified in the equipment technical specification without causing damage, and the cooling water should be restored within the specified water cut-off time, and the main helium fan can continue to operate.

[0003] The existing main helium fan ventilation mode is radial ventilation. The shape of the entire flow channel is very complex. The cooling gas needs to flow through multiple parallel air paths. The flow distribution gap is relatively large, the heat dissipation efficiency is poor, and the wind friction is relatively high. However, with the increase in motor capacity and power density, the heat dissipation effect of the radial ventilation structure can no longer meet the requirements. It is necessary to consider adopting a new ventilation structure to improve the cooling effect of the fan to ensure the safe operation of the main helium fan. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a cooling structure for improving the heat exchange effect of the main helium blower and reducing wind friction, so as to achieve effective ventilation and cooling of the main helium blower drive motor.

[0005] A technical solution to achieve the above object is: a cooling structure for improving the heat exchange effect of the main helium blower and reducing wind friction, including a stator core and a rotor core;

[0006] On the rotor core, a plurality of rotor ventilation holes are opened along the rotor axis at equal radius and equal intervals around the rotor axis, and the rotor ventilation holes penetrate the rotor core to form a rotor air duct;

[0007] On the stator core, a plurality of stator ventilation holes are opened at equal intervals along the rotor axis and at equal radius around the rotor axis. The stator ventilation holes penetrate the stator core to form a stator air duct.

[0008] Furthermore, the rotor ventilation holes are circular and are arranged close to the rotor shaft so as not to interfere with the rotor bars.

[0009] Furthermore, the stator ventilation holes include back ventilation holes arranged on the stator core yoke and slot wedge ventilation holes arranged between the slot wedges of the stator core.

[0010] Furthermore, the back ventilation holes are in the shape of long strips arranged along the tangent direction of the motor, and a stress interval is left between any two adjacent back ventilation holes.

[0011] Furthermore, the shape of the slot wedge ventilation hole is a trapezoid pointing to the center of the rotor shaft, and the width of the tooth ventilation hole increases uniformly along the direction from close to the center of the rotor shaft to far away from the center of the rotor shaft.

[0012] A cooling structure for improving the heat exchange effect of a main helium blower and reducing wind friction of the present invention has the following beneficial effects:

[0013] 1. The axial ventilation form is adopted. Compared with the more complex wind path structure of radial ventilation, the wind path of axial ventilation is simpler and can effectively improve the heat dissipation capacity.

[0014] 2. By setting up multiple ventilation channels and rationally designing the ventilation area and heat exchange area, the cooling effect of the air path on the motor can be improved on the one hand, and the structural reliability under various extreme working conditions can be improved on the other.

[0015] 3. By reasonably designing the size of the ventilation holes of the stator core and the rotor core, the heat dissipation efficiency can be changed more conveniently, and it has strong adaptability.

[0016] 4. The designed axial ventilation has a simple wind path design, which can effectively reduce wind friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an air path of a cooling structure for improving the heat exchange effect of a main helium blower and reducing wind friction of the present invention;

[0018] Figure 2 The present invention is a schematic diagram of ventilation holes of a cooling structure for improving the heat exchange effect of a main helium blower and reducing wind friction. DETAILED DESCRIPTION

[0019] In order to better understand the technical solution of the present invention, the following is a detailed description through specific embodiments:

[0020] The present invention is a cooling structure for improving the heat exchange effect of the main helium blower and reducing wind friction. The main structure is an axial wind duct arranged on the stator core and the rotor core. Figure 1 As shown, it is composed of a stator core and a rotor core, and adopts an axial ventilation method different from radial ventilation. On the rotor core, a plurality of rotor ventilation holes are opened along the rotor axial direction and around the rotor axis at equal radius and equal spacing, and the rotor ventilation holes penetrate the rotor core to form a rotor air duct 1. On the stator core, a plurality of stator ventilation holes are opened along the rotor axial direction and around the rotor axis at equal radius and equal spacing, and the stator ventilation holes penetrate the stator core to form a stator air duct 2. The direction of the arrow is the direction of the airflow.

[0021] Specifically, the present invention arranges ventilation holes of different sizes and shapes on the stator core and the rotor core of the main helium blower. The specific structure is as follows: Figure 2 A back ventilation hole 3 is provided on the yoke of the stator punching sheet, a slot wedge ventilation hole 4 is provided between the slot wedges of the stator core, and a rotor ventilation hole 5 is provided on the rotor.

[0022] The setting of ventilation holes needs to take into account the ventilation and cooling effect of the motor as well as the stress structural strength requirements of the motor itself.

[0023] In one embodiment, the rotor ventilation holes 5 are circular, disposed close to the rotor shaft, and do not interfere with the rotor bars.

[0024] In one embodiment, the back vent hole 3 is in the shape of a long strip arranged along the tangent direction of the motor, and a stress interval is left between any two adjacent back vent holes. The corners of the long strip are chamfered.

[0025] In one embodiment, the shape of the slot wedge ventilation hole is a trapezoid pointing to the center of the rotor shaft, and the width of the tooth ventilation hole increases uniformly along the direction from close to the center of the rotor shaft to far away from the center of the rotor shaft.

[0026] The present invention increases the ventilation area by opening ventilation holes at multiple locations, thereby improving the heat exchange effect to cool the losses of the stator core and the rotor. At the same time, the shape of the ventilation holes at various locations can be adjusted to adjust the component matching of the wind paths at various locations and the ventilation area of ​​the entire motor to achieve a better heat exchange effect. In addition, the designed axial ventilation is different from the tortuous and complex wind path of radial ventilation. The wind path is relatively simple and can effectively reduce wind friction.

[0027] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A cooling structure for improving the heat exchange effect of a main helium blower and reducing wind friction, comprising a stator core and a rotor core, Features: On the rotor core, a plurality of rotor ventilation holes are opened along the rotor axis at equal radius and equal intervals around the rotor axis, and the rotor ventilation holes penetrate the rotor core to form a rotor air duct; On the stator core, a plurality of stator ventilation holes are opened at equal intervals along the rotor axis and at equal radius around the rotor axis. The stator ventilation holes penetrate the stator core to form a stator air duct.

2. A cooling structure for improving the heat exchange effect of the main helium blower and reducing wind friction according to claim 1, It is characterized in that The rotor ventilation holes are circular and arranged close to the rotor shaft without interfering with the rotor bars.

3. A cooling structure for improving the heat exchange effect of the main helium blower and reducing wind friction according to claim 1, It is characterized in that The stator ventilation holes include back ventilation holes arranged on the stator core yoke and slot wedge ventilation holes arranged between the slot wedges of the stator core.

4. A cooling structure for improving the heat exchange effect of the main helium blower and reducing wind friction according to claim 3, It is characterized in that The back ventilation holes are in the shape of long strips arranged along the tangent direction of the motor, and a stress interval is left between any two adjacent back ventilation holes.

5. A cooling structure for improving the heat exchange effect of the main helium blower and reducing wind friction according to claim 3, It is characterized in that The slot wedge ventilation hole is in a trapezoidal shape pointing to the center of the rotor shaft, and the width of the slot wedge ventilation hole increases uniformly along the direction from approaching the center of the rotor shaft to away from the center of the rotor shaft.

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