CN211791138U

CN211791138U - Circulating oil cooling loop structure of oil immersion integrated brushless direct current motor

Info

Publication number: CN211791138U
Application number: CN201921896068.7U
Authority: CN
Inventors: 乔永鸣; 陈东强; 刘传杰; 冯杰; 李少龙; 张普霖; 魏振山
Original assignee: Xinxiang Aviation Industry Group Co Ltd
Current assignee: Xinxiang Aviation Industry Group Co Ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-10-27
Anticipated expiration: 2029-11-05

Abstract

The utility model relates to a circulating oil cooling return circuit structure of immersion oil integral type brushless DC motor, brushless DC motor body mechanical part and controller integration are in among the oil tank, brushless DC motor body needs immersion oil, the controller is not immersion oil, a serial communication port, circulating oil cooling return circuit structure is by the space between motor shaft (1) and front end housing (3), the lubrication groove of preceding graphite bearing (2) self, the air gap between brushless DC motor's stator module (4) and rotor module (8), lead the oil groove between casing (5) and stator module (4), the logical oilhole of rear end housing (6) self, the lubrication groove of rear graphite bearing (7) self, the hollow oil groove of leading of motor shaft (1) self, after brushless DC motor rotates, form high nip and low-pressure area in the oil tank, make the fuel circulate and flow in circulating oil cooling return circuit structure, the stator assembly (4) of the brushless direct current motor and the controller generate heat to be brought into the oil tank to play a role in cooling.

Description

Circulating oil cooling loop structure of oil immersion integrated brushless direct current motor

Technical Field

The utility model belongs to the energy power field relates to a circulating oil cooling return circuit structure of immersion oil integral type brushless DC motor.

Background

At present, the oil-immersed brushless direct current motor is more and more commonly applied, and the motor body and the controller adopt an integrated structure, so that the motor body is in a completely sealed state. A circulating oil cooling loop is designed in the oil immersion motor, so that the motor can be better ensured to have good heat dissipation.

The original circulating oil cooling loop structure is mainly characterized in that holes are punched at the position of a motor shell (close to a rear end cover), and the size and the number of the holes are calculated according to the flow speed, the flow and the sectional area of immersed oil. In the circulating oil cooling loop with the opening of the shell, fuel oil in the oil tank enters the interior of the motor from a high-pressure area at the back of the impeller through the front graphite bearing lubricating groove, flows through an air gap between a stator and a rotor of the motor, then flows out of the opening of the shell and enters the oil tank again.

Adopt the circulation oil cooling return circuit structure of casing trompil, the motor is at the course of the work, and the circulation oil return circuit is not discharged the inside air of motor completely, and the graphite bearing still is in the middle of the air after the motor rotates, can not obtain sufficient lubrication, stirs oil often and stirs air often to cause the motor temperature to rise, the cooling effect is unsatisfactory, and the pump current of taking has undulant, and the charge value of pump also fluctuates thereupon, takes pump performance unstable.

Disclosure of Invention

The purpose of the invention is: the utility model provides a new hollow shaft circulating oil cooling return circuit structure, solves the motor and takes the unstable problem of pump performance, current fluctuation to improve the motor reliability.

The technical scheme of the invention is as follows: the utility model provides a brushless DC motor's of immersion oil integral type circulation oil cooling return circuit structure, brushless DC motor body mechanical part and controller integration are in among the oil tank, brushless DC motor body needs immersion oil, the controller is not immersion oil, circulation oil cooling return circuit structure is by the space between motor shaft and the front end housing, preceding graphite bearing self lubricating groove, the air gap between brushless DC motor's stator module and the rotor subassembly, the oil groove of leading between casing and the stator module, the logical oilhole of rear end housing self, back graphite bearing self lubricating groove, motor shaft self hollow leads the oil groove and constitutes, brushless DC motor is rotatory the back, form high nip and low-pressure region in the oil tank, make the fuel circulate at circulation oil cooling return circuit structure circulation flow, bring brushless DC motor's stator module and controller into the oil tank with the heat production, play the refrigerated effect.

The motor shaft is a hollow shaft. The fuel oil at the oil inlet of the centrifugal pump flows in from the high-pressure area at the back of the impeller, passes through the circulating oil cooling loop structure and finally flows out to the low-pressure area of the oil tank. The centrifugal pump is located in the oil tank. The rear end cover is sealed and isolated from the shell. The O-shaped sealing ring is arranged between the rear end cover and the shell.

The technical effects of the utility model are that: adopt the circulation oil cooling return circuit structure of hollow shaft, the motor is at the working process, and the circulation oil return circuit can be discharged the inside air of motor completely, guarantees that the graphite bearing is in the middle of the fluid completely when the motor rotates, obtains sufficient lubrication, and the motor takes the pump stable performance, also can guarantee simultaneously that fluid takes away the heat that stator winding and controller produced, plays good cooling effect.

Drawings

Fig. 1 is a schematic view of a circulation oil cooling loop of an oil immersion integrated brushless dc motor according to the present invention.

Fig. 2 is a structural view of a graphite bearing.

Fig. 3 is a structural view of a stator core.

1-motor shaft 2-front graphite bearing 3-front end cover 4-stator component 5-shell 6-rear end cover 7-rear graphite bearing 8-rotor component 9-sealing ring

The specific implementation mode is as follows:

immersion oil integral type brushless DC motor's hollow shaft circulating oil cooling return circuit structure mainly is: (1) drilling through the front end and the rear end of a shaft by using drill bits with phi 3mm and phi 1.5mm on the basis of the solid shaft to form a hollow shaft; and (2) two through holes with phi of 1.5mm are formed in the rear end cover (the upper end of the graphite bearing). The circulating oil cooling circuit of the hollow shaft is shown in fig. 1. The motor arrangement shown in fig. 1 is an installation manner in an oil tank, and the position direction indicated by an arrow is a working route for circulating oil cooling of oil in the motor. According to the arrow, in the circulating oil cooling loop of the hollow shaft, fuel oil in the oil tank enters the motor from a high-pressure area at the back of the impeller along a gap between the front end cover and the hollow shaft of the motor through the front graphite bearing lubricating groove 10, flows through an air gap between the rotor assembly and the stator assembly of the motor and the oil guide groove 11 of the stator assembly, enters the tracking magnetic ring cavity from the opening parts of the rear graphite bearing lubricating groove 10 and the rear end cover, is discharged to a low-pressure area through the hollow shaft, and enters the oil tank again. The sealing treatment between the rear end cover and the shell in the circulating oil cooling loop structure is realized through an O-shaped sealing ring.

The lubrication groove 10 of the graphite bearing is shown in fig. 2; the oil guide groove 11 of the stator core is structured as shown in fig. 3.

Claims

1. A circulating oil cooling loop structure of an oil immersion integrated brushless direct current motor is characterized in that a mechanical part of a brushless direct current motor body and a controller are integrated in an oil tank, the brushless direct current motor body needs oil immersion, the controller does not need oil immersion, it is characterized in that the circulating oil cooling loop structure consists of a gap between a motor shaft (1) and a front end cover (3), a lubricating groove of a front graphite bearing (2), an air gap between a stator assembly (4) and a rotor assembly (8) of the brushless direct current motor, an oil guide groove between a shell (5) and the stator assembly (4), an oil through hole of a rear end cover (6), a lubricating groove of a rear graphite bearing (7) and a hollow oil guide groove of the motor shaft (1), after the brushless direct current motor rotates, a high pressure area and a low pressure area are formed in the oil tank, so that fuel oil circularly flows in a circulating oil cooling loop structure, and heat generated by a stator assembly (4) of the brushless direct current motor and a controller is brought into the oil tank.

2. The structure of the circulating oil cooling circuit according to claim 1, wherein the motor shaft (1) is a hollow shaft.

3. The circulation oil cooling circuit structure of claim 1, wherein the fuel of the suction port of the centrifugal pump flows in from the high pressure area of the back of the impeller, passes through the circulation oil cooling circuit structure, and finally flows out to the low pressure area of the oil tank.

4. The circulating oil cooling circuit structure as set forth in claim 3, wherein the centrifugal pump is located in the oil tank.

5. The structure of the circulating oil cooling circuit according to claim 1, wherein the rear cover (6) is hermetically isolated from the housing (5).

6. The structure of the circulating oil cooling circuit according to claim 1, wherein an O-ring (9) is installed between the rear end cover (6) and the housing (5).