WO2021004071A1

WO2021004071A1 - Autonomous heat extraction cooling structure for high-speed motor

Info

Publication number: WO2021004071A1
Application number: PCT/CN2020/076597
Authority: WO
Inventors: 黄俊锋
Original assignee: 泉州市华德机电设备有限公司
Priority date: 2019-07-08
Filing date: 2020-02-25
Publication date: 2021-01-14
Also published as: CN110149024A; CN110149024B

Abstract

Disclosed is an autonomous heat extraction cooling structure for a high-speed motor. The structure comprises a front end cap, a rear end cap, a housing, and an air discharge shell. An inner surface of the front end cap is provided with an air hole. Centers of inner surfaces of the front end cap and the rear end cap are movably connected to a first rotor shaft and a second rotor shaft via a bearing, respectively. Outer surfaces of the first rotor shaft and the second rotor shaft are provided with a stator, and a magnetic steel member is disposed between the first rotor shaft and the second rotor shaft. The present invention provides the air hole on the inner surface of the front end cap, and controls, by means of the actions of the housing, a retaining plate in the shell, an impeller, and an opening, the temperature of the rotor shafts and bearing to be within a range in which operations are not affected, thereby improving stability and safety of the entire unit. In addition, the present structure solves the problems of heat dissipation and cooling of high-speed motor stators, rotors, and bearings without changing the structure of high-speed motors, thereby alleviating a temperature increase problem of high-speed motors without additional apparatuses.

Description

Self-extracting heat cooling structure for high-speed motor

Technical field

The invention relates to the technical field of motors, in particular to a self-extracting heat cooling structure for high-speed motors.

Background technique

A motor is a device that converts electrical energy into mechanical energy. It uses energized coils (that is, stator windings) to generate a rotating magnetic field and act on the rotor (such as a squirrel-cage closed aluminum frame) to form a magneto-electric power rotating torque. There are different types of DC motors and AC motors. Most of the motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the motor stator magnetic field speed and the rotor rotation speed do not maintain synchronous speed). The motor is mainly composed of a stator and a rotor. , The direction of the force movement of the energized wire in the magnetic field is related to the direction of the current and the direction of the magnetic line of induction (the direction of the magnetic field). The working principle of the motor is the action of the magnetic field on the current to make the motor rotate.

technical problem

At present, the commonly used high-speed motors all use water pumps to make surface cooling circulation systems, which require separate water pumps and heat dissipation systems. The structure is relatively complicated, and the heat dissipation of the rotor shaft and bearings is not very ideal. The heat dissipation is related to the stability and reliability of the overall motor operation. Poor heat dissipation of the rotor shaft and bearing during high-speed operation will cause the thermal expansion of the rotor shaft and bearing to cause the spindle to produce imbalance and bearing clearance changes, and the rotor shaft uses permanent magnets , High-speed operation will cause the rotor shaft to heat up. Without cooling, it will have a great impact on the permanent magnets, and will cause the permanent magnets to be severely demagnetized and cause the performance of the motor to decline. Therefore, the heat dissipation of the rotor shaft and bearings is related to the overall reliability. Therefore, we propose a high-speed motor self-extraction cooling structure.

Technical solutions

The object of the present invention is to provide a self-extracting heat cooling structure for a high-speed motor to solve the problems raised in the background art.

In order to achieve the above objective, the present invention provides the following technical solutions: a high-speed motor self-extracting heat cooling structure, including a front end cover, a rear end cover, an outer shell and an air outlet shell, the inner surface of the front end cover is provided with an air hole groove, and the front end The middle ends of the inner surfaces of the cover and the rear end cover are respectively movably connected with a first rotor shaft and a second rotor shaft through bearings. The outer surfaces of the first rotor shaft and the second rotor shaft are provided with a stator, and the stator and the first rotor A magnetic steel is arranged between the shaft and the second rotor shaft, the left end of the outer surface of the second rotor shaft is sleeved with an inner fixed plate of the wind shell, and the left side of the inner fixed plate of the wind shell is fixedly connected with an impeller. The inner surface is provided with a stator coil, and the outer surface of the stator is provided with a stator fixing flange, the left side of the front end cover is connected with the housing by a fastening screw, and the inner surface of the housing is provided with a notch, and the left side of the housing passes tightly. A wind shell connecting flange is connected with a fixed screw, the inner surface of the wind shell connecting flange is provided with a rear end cover, and the left side of the wind shell connecting flange is connected with an air outlet wind shell through a fastening screw.

Preferably, the number of the air hole grooves is four, and the four air hole grooves are arranged at an equal angle.

Preferably, the stator fixing flange and the housing are connected by strips, the number of strips is four, and the four strips are arranged horizontally and diagonally.

Preferably, the connection between the front end cover and the first rotor shaft and the connection between the back end cover and the second rotor shaft are provided with a bearing pressure plate, and the front end cover, the magnet, the second rotor shaft and the bearing pressure plate are also Reserve an air duct.

Preferably, the number of the notches is eight, and the distance between every two adjacent notches is the same.

Beneficial effect

Compared with the prior art, the beneficial effects of the present invention are as follows:

The invention has air vent slots on the inner surface of the front end cover, and through the action of the magnetic steel, the fixed plate in the wind casing, the impeller and the notches, the four air vent slots connected by the front end cover are sucked into the inside of the shell and the eight slots opened on the shell The airflow from the port is sucked in together. The stator and the stator fixing flange and the shell are welded horizontally and diagonally at the four diagonal corners through four strips, and there are no obstructions in the middle, thus forming four large channels. The large channel flows through and takes away the heat from the outer ring of the stator. Because a magnetic steel is installed between the stator and the first and second rotor shafts, the inhaled air flow can directly pass through and transfer the stator, first and second rotor shafts. The heat in the rotor shaft and the shell is taken away. At the same time, the air hole grooves flow to take away the heat of the bearing, and the air duct reserved between the front end cover, the magnet, the second rotor shaft and the bearing plate also removes the heat of the bearing , To further improve its heat dissipation effect, the air casing connecting flange directly sends the hot air to the impeller until the hot air is discharged from the outlet air casing, and continues to run in this way, so that the temperature of the rotor shaft is controlled within the range that does not affect the operation, and the The stability and safety of the whole machine. At the same time, this structure can change the heat dissipation and cooling problems of the high-speed motor without changing the structure of the high-speed motor, and can reduce the temperature rise of the rotor shaft and the space of the high-speed motor without additional equipment.

Description of the drawings

Figure 1 is a schematic diagram of the structure of the present invention.

In the picture: 1 front end cover, 2 rear end cover, 3 stator, 4 air hole slots, 5 shell, 6 stator coil, 7 first rotor shaft, 8 bearing pressure plate, 9 air casing connecting flange, 10 notch, 11 air casing Internal fixed plate, 12 stator fixed flange, 13 impeller, 14 air outlet shell, 15 plates, 16 magnetic steel, 17 second rotor shaft.

Embodiments of the invention

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In the description of the application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be interpreted in a broad sense, for example, "connected" may be a fixed connection. It may also be detachably connected or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood under specific circumstances.

The front end cover 1, the rear end cover 2, the stator 3, the air hole slot 4, the housing 5, the stator coil 6, the first rotor shaft 7, the bearing plate 8, the wind shell connecting flange 9, the slot 10, and the inside of the wind shell of the present invention The fixing plate 11, the stator fixing flange 12, the impeller 13, the air outlet shell 14, the strip 15, the magnetic steel 16, and the second rotor shaft 17 are all common standard parts or parts known to those skilled in the art, and their structure and principle All these technicians can know through technical manuals or through conventional experimental methods.

Please refer to Figure 1, a high-speed motor self-extracting heat and cooling structure, including a front cover 1, a rear cover 2, a shell 5 and an air outlet shell 14. The inner surface of the front cover 1 is provided with air hole slots 4, the number of air hole slots 4 There are four, and the four air hole slots 4 are arranged at equal angles, and the middle ends of the inner surfaces of the front end cover 1 and the rear end cover 2 are respectively movably connected with the first rotor shaft 7 and the second rotor shaft 17 through bearings. The connection between the cover 1 and the first rotor shaft 7 and the connection between the back end cover 2 and the second rotor shaft 17 are both provided with a bearing pressing plate 8, and the front end cover 1, the magnetic steel 16, the second rotor shaft 17 and the bearing pressing plate 8 An air duct is reserved between the bearings to extract heat from the bearing and further improve its heat dissipation effect. The outer surfaces of the first rotor shaft 7 and the second rotor shaft 17 are provided with a stator 3, and the stator 3 is connected to the first rotor shaft. A magnetic steel 16 is arranged between 7 and the second rotor shaft 17, the left end of the outer surface of the second rotor shaft 17 is sleeved with a wind casing inner fixing plate 11, and the left side of the wind casing inner fixing plate 11 is fixedly connected with an impeller 13, The inner surface of the stator 3 is provided with a stator coil 6, and the outer surface of the stator 3 is provided with a stator fixing flange 12, the stator fixing flange 12 and the housing 5 are connected by a strip 15 and the number of the strip 15 is four. And the four strips 15 are arranged horizontally and diagonally, the left side of the front cover 1 is connected with the housing 5 by fastening screws, and the inner surface of the housing 5 is provided with notches 10, and the front cover 1 is connected with four air holes. 4 The air drawn into the inside of the shell 5 and the eight slots 10 opened on the shell 5 is sucked in together. The stator 3 and the stator fixing flange 12 are welded to the shell 5 horizontally and diagonally by four strips 15 at four opposite corners, and There are no obstructions in the middle, thus forming four large channels. The inhaled air flows through the four large channels and takes away the heat from the outer ring of the stator 3, because the stator 3 is between the first rotor shaft 7 and the second rotor shaft 17 There is a magnetic steel 16 between them, and the air drawn in can directly pass through and take away the heat in the stator 3, the first rotor shaft 7, the second rotor shaft 17 and the housing 5. At the same time, the air hole groove 4 flows to take away the heat of the bearing. The air shell connecting flange 9 directly sends the hot air to the impeller 13 until the hot air is discharged from the air outlet air shell 14, and continues to operate in this way, so that the temperature of the rotor shaft is controlled within the range that does not affect the operation, and the stability of the whole machine is improved At the same time, this structure can change the heat dissipation and cooling problems of the high-speed motor without changing the structure of the high-speed motor, and can reduce the temperature rise of the rotor shaft and the high-speed motor space without additional equipment. The number of slots 10 is Eight, and the distance between every two adjacent notches 10 is the same. The left side of the housing 5 is connected with a wind shell connecting flange 9 by fastening screws, and the inner surface of the wind shell connecting flange 9 is provided with a rear end The cover 2 and the left side of the wind shell connecting flange 9 are connected with the outlet wind shell 14 by fastening screws. The bearings including mechanical bearings, air bearings, and magnetic bearings can all be cooled by this solution.

When in use, an air hole slot 4 is opened on the inner surface of the front end cover 1, and the four air hole slots 4 connected to the front end cover 1 are sucked into the shell by the action of the magnetic steel 16, the inner fixing plate 11 of the wind casing, the impeller 13 and the slot 10 5 The airflow from the eight slots 10 in the interior and the housing 5 is sucked in together. The stator 3 and the stator fixing flange 12 are welded to the housing 5 through four strips 15 horizontally and diagonally at four diagonal corners, and there is no obstruction in the middle. In this way, four large channels are formed. The inhaled air flows through the four large channels and takes away the heat from the outer ring of the stator 3, because there is a space between the stator 3 and the first rotor shaft 7 and the second rotor shaft 17. Magnetic steel 16, the inhaled air flow can directly pass and take away the heat in the stator 3, the first rotor shaft 7, the second rotor shaft 17 and the casing 5. At the same time, the air hole groove 4 flows to take away the heat of the bearing, and the front end cover 1. The air duct reserved between the magnetic steel 16, the second rotor shaft 17 and the bearing plate 8 also draws away the heat of the bearing to further improve its heat dissipation effect. The air casing connecting flange 9 directly sends the hot air to the impeller 13 Until the hot air is discharged from the air outlet shell 14, and continue to run in this way, so that the temperature of the rotor shaft is controlled within the range that does not affect the operation, and the stability and safety of the whole machine are improved. At the same time, the structure does not change the high-speed motor The structure can change the heat dissipation and cooling problems of the high-speed motor, and can reduce the temperature rise of the rotor shaft and the space of the high-speed motor without additional equipment.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. And variations, the scope of the present invention is defined by the appended claims and their equivalents.

Claims

A self-extracting heat and cooling structure for a high-speed motor, comprising a front end cover (1), a rear end cover (2), a shell (5) and an air outlet shell (14), characterized in that: the inner surface of the front end cover (1) An air hole slot (4) is provided, and the middle ends of the inner surfaces of the front end cover (1) and the rear end cover (2) are respectively movably connected to the first rotor shaft (7) and the second rotor shaft (17) through bearings. The outer surfaces of the first rotor shaft (7) and the second rotor shaft (17) are provided with a stator (3), and a stator (3) is provided between the stator (3) and the first rotor shaft (7) and the second rotor shaft (17) Magnetic steel (16), the left end of the outer surface of the second rotor shaft (17) is sleeved with a wind casing inner fixing plate (11), and the left side of the wind casing inner fixing plate (11) is fixedly connected with an impeller (13) , The inner surface of the stator (3) is provided with a stator coil (6), and the outer surface of the stator (3) is provided with a stator fixing flange (12), and the left side of the front end cover (1) is fastened with screws Connected to the housing (5), and the inner surface of the housing (5) is provided with a notch (10), the left side of the housing (5) is connected with a wind shell connecting flange (9) by a fastening screw, and the wind shell is connected The inner surface of the flange (9) is provided with a rear end cover (2), and the left side of the wind shell connecting flange (9) is connected with an air outlet wind shell (14) through fastening screws.
The self-extracting heat cooling structure of a high-speed motor according to claim 1, characterized in that: the number of the air hole slots (4) is four, and the four air hole slots (4) are arranged at an equal angle.
The self-extracting heat cooling structure of a high-speed motor according to claim 1, characterized in that: the stator fixing flange (12) and the housing (5) are connected by a strip (15), the strip (15) The number is four, and the four slats (15) are set horizontally and diagonally.
The self-extracting heat cooling structure of a high-speed motor according to claim 1, characterized in that: the connection between the front end cover (1) and the first rotor shaft (7) and the rear end cover (2) and the second rotor The joints of the shaft (17) are provided with a bearing pressure plate (8), and an air duct is reserved between the front end cover (1), the magnet (16), the second rotor shaft (17) and the bearing pressure plate (8) .
The self-extracting heat cooling structure of a high-speed motor according to claim 1, wherein the number of the slots (10) is eight, and the distance between every two adjacent slots (10) is equal the same.