CN106558948B

CN106558948B - Shaft water cooling structure

Info

Publication number: CN106558948B
Application number: CN201510617030.1A
Authority: CN
Inventors: 姜仲民; 肖红; 刘树楠; 王成伟; 康烁
Original assignee: Fushun Coal Mine Motor Manufacturing Co Ltd
Current assignee: Fushun Coal Mine Motor Manufacturing Co Ltd
Priority date: 2015-09-24
Filing date: 2015-09-24
Publication date: 2023-05-12
Anticipated expiration: 2035-09-24
Also published as: CN106558948A

Abstract

The invention relates to the field of motor manufacturing, and discloses a shaft water cooling structure, wherein a first half shaft is connected with a second half shaft through a connecting pin; a central hole is formed in the second half shaft, a horizontal guide pipe is arranged in the central hole, and two ends of the horizontal guide pipe are fixed in the central hole through a supporting sleeve and a transition sleeve; the transition sleeve is also provided with a waterproof bearing, one end of the inner tube is fixed on the waterproof bearing, and the other end of the inner tube is communicated with a water inlet on the water tank shell; the inner pipe is communicated with the horizontal flow guide pipe; a water outlet hole is arranged at one end of the horizontal flow guide pipe, which is far away from the inner pipe; the end surface of the supporting sleeve is provided with uniformly distributed small holes; cooling water flowing out of the water outlet hole flows into the water tank shell through the gap between the supporting sleeve, the inner pipe and the central hole, and finally flows out of the water outlet of the water tank shell; the check ring for the hole is arranged at the water inlet end of the waterproof bearing. The invention has the advantages of reducing the temperature rise of the motor winding, the rotor cage bar and the bearing for the motor with small volume and larger power.

Description

Shaft water cooling structure

Technical Field

The invention relates to the field of motor manufacturing, in particular to a shaft water cooling structure for realizing high-power small-volume motor and reducing temperature rise of a motor winding, a rotor cage bar and a bearing.

Background

On one hand, the appearance of the motor is limited by the assembly space of the unit; on the other hand, the coal mine has bad working conditions, high requirements on the motor performance and large temperature rising redundancy. According to the motor design theory, the volume of the motor is reduced, the temperature rise of the windings and the bearings is increased, and the temperatures of the windings and the bearings directly influence the service life of the motor, so that a method for reducing the temperature rise of the windings, the rotor cage bars and the bearings of the motor is urgently needed to meet the requirements of users and adapt to the market demands.

Disclosure of Invention

In order to solve the technical problems, the invention discloses a water cooling structure for reducing temperature rise of a motor winding, a rotor cage bar and a bearing of a high-power small-volume motor, which comprises the following specific technical scheme:

a shaft water cooling structure comprises a horizontal guide pipe, a supporting sleeve, a transition sleeve, a waterproof bearing, a hole check ring, an inner pipe, a water tank shell, a first half shaft and a second half shaft; the first half shaft is connected with the second half shaft through a connecting pin; a central hole is formed in the second half shaft, a horizontal guide pipe is arranged in the central hole, and two ends of the horizontal guide pipe are fixed in the central hole through a supporting sleeve and a transition sleeve; a waterproof bearing is arranged in the transition sleeve, one end of the inner tube is fixed on the waterproof bearing, and the other end of the inner tube is communicated with a water inlet on the water tank shell; the inner pipe is communicated with the horizontal flow guide pipe; a water outlet hole is arranged at one end of the horizontal flow guide pipe, which is far away from the inner pipe; the end surface of the supporting sleeve is provided with uniformly distributed small holes; cooling water flowing out of the water outlet hole flows into the water tank shell through the gap between the supporting sleeve, the inner pipe and the central hole, and finally flows out of the water outlet of the water tank shell; the check ring for the hole is arranged at the water inlet end of the waterproof bearing.

The outer section of the supporting sleeve is regular polygon; the section of the inner hole of the supporting sleeve is also regular polygon.

The water inlet and the water outlet of the water tank shell are communicated with the front end cover and the rear end cover cooling system of the motor.

Temperature measuring elements are arranged in the motor stator winding, the front end cover and the rear end cover.

The invention has the advantages that 1. The motor with small volume and large power has the advantages of reducing the temperature rise of a motor winding, a rotor cage bar and a bearing and has good effect; 2. the structure is reasonable and simple; 3. the temperature requirement of the high-power motor can be met by a small volume, so that the high-power motor has higher economical efficiency.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

fig. 2 is a schematic end view of a support sleeve.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings;

as shown in fig. 1, the invention comprises a horizontal flow guide pipe 1, a supporting sleeve 2, a transition sleeve 3, a waterproof bearing 4, a hole retainer ring 5, an inner pipe 6, a water tank shell 7, a first half shaft 8, a connecting pin 9, a second half shaft 10, a water inlet 11 and a water outlet 12, wherein the first half shaft 8 is connected with the second half shaft 10 through the connecting pin 9; a central hole 13 is formed in the second half shaft 10, a horizontal flow guide pipe 1 is arranged in the central hole 13, and two ends of the horizontal flow guide pipe 1 are fixed in the central hole 13 through a support sleeve 2 and a transition sleeve 3; a waterproof bearing 4 is arranged in the transition sleeve 3, one end of the inner tube 6 is fixed on the waterproof bearing 4, and the other end is communicated with a water inlet 11 on the water tank shell 7; the inner pipe 6 is communicated with the horizontal flow guide pipe 1; the end of the horizontal flow guide pipe 1 far away from the inner pipe 6 is provided with a water outlet hole 14; the end surface of the supporting sleeve 2 is provided with uniformly distributed small holes 21; the cooling water flowing out from the water outlet hole 14 flows into the water tank shell 7 through the supporting sleeve, the inner pipe 6 and the gap between the central hole 13, and finally flows out from the water outlet 12 of the water tank shell 7; the retainer ring 5 for holes is arranged at the end of the waterproof bearing 4 close to the water inlet 11.

In order to achieve the whole cooling effect and simplify the structure of the circulating water channel, the water inlet 11 and the water outlet 12 of the water tank shell are communicated with the cooling systems of the front end cover and the rear end cover of the motor.

Temperature measuring elements are arranged in the motor stator winding, the front end cover and the rear end cover for monitoring the temperature of key positions in the motor in real time. The temperature measuring element can adopt PT100 (platinum thermal resistor);

as shown in fig. 2, the cross section of the supporting sleeve 2 has a structure that a hole is formed in the middle and a plurality of small holes are formed in the periphery, and the number of the supporting sleeves 2 is changed according to the length of the shaft and is uniformly distributed; the horizontal flow guide pipe 1 is supported at the center of the shaft through a center hole of the supporting sleeve 2, and cooling water flows through small holes around the supporting sleeve 2.

Copper loss of a motor stator winding and copper loss generated by a rotor cage bar respectively account for 20% of total loss of the motor, iron loss generated by a stator iron core and a rotor iron core accounts for 40% of total loss of the motor, and the rest of the motor is mechanical loss and the like. These losses will cause the motor to generate a lot of heat when it outputs rated power, which greatly reduces the temperature rise of the shaft by cooling water after use of the rotary cooling system: on one hand, the shaft takes away the heat of the rotor cage bars through the rotor iron core, so that the temperature rise of the rotor is greatly reduced, and the temperature rise of the stator iron core and the stator winding is directly greatly reduced after the heat of the surface of the rotor is not diffused to the stator iron core, so that the service life of the motor is prolonged; on the other hand, when designing a high-power motor, the front end cover and the rear end cover are generally designed into a water-cooling structure, so that the bearing jacket is forced to be cooled by water, and meanwhile, the water-cooling inner side of the end cover is matched with a small fan in the inner cavity of the motor, so that the heat of the iron core is blown to the end cover, and the temperature rise of the inner cavity of the motor is greatly reduced. The heat of the inner tube of the bearing can not be taken away, and after a rotary cooling system of the shaft is added, the inner sleeve and the outer sleeve of the bearing are simultaneously cooled by water, so that the temperature rise of the bearing is greatly reduced, and the service life of the bearing is prolonged. When the motor works normally, the structure of the invention cools the motor together with the front end cover, the rear end cover and the base water cooling system of the original motor, so that the cooling effect is better.

PT100 (platinum thermal resistor) is arranged in the motor stator winding, the front end cover and the rear end cover and is used as a temperature measuring element; the far infrared thermometer is used for measuring when the motors of the front end cover, the outer side of the rear end cover and the rear shaft head (namely the motor is provided with a rotary joint) are tested; the shaft water cooling system has larger influence on the temperature rise of each part of the motor, has the advantages of reducing the temperature rise of the motor winding, the rotor cage bars and the bearings, can meet the requirements of users and is suitable for the market.

The inner pipe is fixed with the water tank shell 7, and the horizontal flow guide pipe is fixed in the second half shaft and rotates along with the second half shaft; and the inner pipe is communicated with the horizontal flow guide pipe through the waterproof bearing, so that the sealing reliability is guaranteed, the structure is simple, in addition, cooling water in the horizontal flow guide pipe rotates along with the shaft, the centrifugal force is increased, and the cooling water flows more smoothly. The outer section of the supporting sleeve is regular polygon, such as regular octagon in the embodiment; the structure has the advantages of being convenient to fix in the central hole of the half shaft II, and the cross section of the inner hole of the supporting sleeve is regular polygon so as to fix the horizontal guide pipe and prevent the horizontal guide pipe from rolling.

The arrow direction in fig. 1 is the cooling water flow direction.

Claims

1. The shaft water cooling structure is characterized by comprising a horizontal guide pipe, a supporting sleeve, a transition sleeve, a waterproof bearing, a hole retainer ring, an inner pipe, a water tank shell, a first half shaft and a second half shaft; the first half shaft is connected with the second half shaft through a connecting pin; a central hole is formed in the second half shaft, a horizontal guide pipe is arranged in the central hole, and two ends of the horizontal guide pipe are fixed in the central hole through a supporting sleeve and a transition sleeve; the transition sleeve is also provided with a waterproof bearing, one end of the inner tube is fixed on the waterproof bearing, and the other end of the inner tube is communicated with a water inlet on the water tank shell; the inner pipe is communicated with the horizontal flow guide pipe; a water outlet hole is arranged at one end of the horizontal flow guide pipe, which is far away from the inner pipe; the end surface of the supporting sleeve is provided with uniformly distributed small holes; cooling water flowing out of the water outlet hole flows into the water tank shell through the gap between the supporting sleeve, the inner pipe and the central hole, and finally flows out of the water outlet of the water tank shell; the check ring for the hole is arranged at the water inlet end of the waterproof bearing.

2. The shaft water cooling structure according to claim 1, wherein the outer section of the supporting sleeve is a regular polygon; the section of the inner hole of the supporting sleeve is also regular polygon.

3. The shaft water cooling structure as set forth in claim 1, wherein temperature measuring elements are provided in the motor stator winding, in the front end cover, and in the rear end cover.

4. The shaft water cooling structure of claim 1, wherein the water inlet and the water outlet of the water tank shell are communicated with a front end cover and a rear end cover cooling system of the motor.