CN111327147A

CN111327147A - Axial thrust device for motor rotor

Info

Publication number: CN111327147A
Application number: CN202010292465.4A
Authority: CN
Inventors: 成榕
Original assignee: Shanghai Zhengrong Industry And Trade Co ltd
Current assignee: Shanghai Zhengrong Industry And Trade Co ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-06-23

Abstract

The invention discloses an axial thrust washer device of a pump motor, which comprises: the electric rotor axial thrust device comprises a housing of an electric rotor axial thrust device consisting of a front seat (5) and a rear cover (10), and a thrust mechanism part arranged inside the housing: a rear cover pressure bearing ring (9), a front seat pressure bearing ring (12), and a thrust disc (7) arranged between the rear cover pressure bearing ring (9) and the front seat pressure bearing ring (12). By adopting the invention, when the motor runs, the thrust disc enables the electric rotor to be axially at the designed working position. When the electric rotor is about to generate axial out-of-control large displacement, the two bearing rings of the device can bear axial displacement forces in different directions on the thrust disc, and limit the axial displacement of the electric rotor within 0.8-1.0 mm.

Description

Axial thrust device for motor rotor

Technical Field

The invention belongs to the field of improvement of high-speed large-capacity motors, and particularly relates to an axial thrust device of a motor rotor.

Background

Large high speed motors, generally referred to as rotational speed: the bearings of the motors with N =2970r/min and power of N =2000kw are mostly used in equipment such as power station water feeding pumps, fans and oilfield high-pressure water injection pumps, and the bearings of the motors have large rotor bodies, heavy weight, thick shaft and high rotating speed, so the bearing comprehensive technical index of the bearings exceeds the use limit of rolling bearings (such as spring discs), and therefore sliding bearings are required.

As shown in figure 1, the sliding bearing is simple in structure and divided into an upper half and a lower half, such as a tile shape, so the sliding bearing is called a 'bearing bush', the bearing bush is placed in a bearing seat, and babbitt metal is cast on the circumferential inner wall and two side end faces of the bearing bush. The main shaft of the motor rotor is placed in the bearing bush, the section of the main shaft, which is positioned on the bearing bush, is called a journal, and after the journal and the bearing bush are assembled, a radial gap is reserved at the top of the journal.

Lubricating oil is input into the bearing bush, and when the electric rotor runs at a high speed, a high-pressure oil film is generated at the babbitt metal pressure-bearing part at the bottom of the lower bearing bush to jack the electric rotor (in a radial gap) to run at a high speed. Meanwhile, axial oil return gaps are reserved on the end surfaces of the two sides of the shaft neck and the end surfaces of the two sides of the bearing bush, the total value is 5-10 mm (the total value of each motor is determined by the setting of a motor factory), and the axial oil return gaps are used for discharging hot oil after the bearing bush operates and flowing into an oil chamber. The rotor of the motor can not move in theory, so that the oil return gaps on two sides of the rotor are designed to be equal under the working position, and the two end faces of the moving and static parts of the bearing bush can not be rubbed and abraded, as shown in figure 1.

However, in practical use, after the motor runs for a period of time, the electric rotors may generate irregular axial movement, some of the electric rotors may move to the left side or the right side singly, and some of the electric rotors may move back and forth endlessly left and right endlessly, and the reasons of the movement phenomena are unknown so far. The axial shift of the rotor causes the end face of the shaft neck to push against the babbitt metal on the end face of the bearing bush during operation, so that the babbitt metal on the end face of the bearing bush gradually wears off and is lost, and even the babbitt metal on the end face is polished to continue to be ground to the base metal of the bearing bush in severe cases, as shown in fig. 2. When the end face of the journal is pushed and pressed on the end face of the bearing bush, the bearing bush can vibrate, generate heat and increase energy consumption; the most dangerous axial large movement of the electric rotor is that the rotor rapidly generates continuous left and right movement, the end face of a shaft neck continuously collides and grinds the end face of a bearing bush, rebound force is generated to increase shaft movement force, the dynamic and static end faces are tightly attached and combined, lubricating oil cannot permeate, metal on the two end faces is subjected to dry friction, the bearing bush and the shaft neck are instantly burnt and melted, and the safety and normal operation of user equipment are seriously threatened.

Disclosure of Invention

The present invention overcomes the above-described problems and provides an axial thrust device capable of preventing the rotor of the motor from large axial play.

The purpose of the invention is realized by the following technical scheme:

an electric motor rotor axial thrust device comprising: the electric rotor axial thrust device comprises a housing of an electric rotor axial thrust device consisting of a front seat and a rear cover, and a thrust mechanism component arranged inside the housing: the bearing device comprises a rear cover bearing ring, a front seat bearing ring and a thrust disc arranged between the rear cover bearing ring and the front seat bearing ring.

Furthermore, the front seat is composed of an upper seat body and a lower seat body which are matched with each other.

Furthermore, the front seat bearing ring and the rear cover bearing ring are respectively composed of 10 sectors which are uniformly distributed, and the sectors of the front seat bearing ring and the rear cover bearing ring are in one-to-one correspondence.

Furthermore, the axial clearance between the thrust disc and the front seat bearing ring and between the thrust disc and the rear cover bearing ring is 0.8-1.0 mm.

Furthermore, the front seat and the rear cover are respectively provided with a screw hole, and the front seat and the rear cover are connected into a whole through the screw holes by bolts.

Furthermore, the front seat end face is provided with a screw hole, and the front seat is fixed on the bearing bush end face through a bolt.

Compared with the prior art, the invention has the beneficial effects that:

(1) when the motor runs, the thrust disc enables the electric rotor to be axially at the designed working position. When the electric rotor is about to generate axial out-of-control large displacement, the two bearing rings of the device can bear axial displacement forces in different directions on the thrust disc, and limit the axial displacement of the electric rotor within 0.8-1.0 mm.

(2) Because the axial displacement is small and is only 1mm, the axial displacement impact force and the rebound force can be reduced, so that the axial displacement force of the rotor is reduced, the end face of the electric rotor journal is prevented from touching and pushing the end face of the bearing bush to abrade and damage babbit alloy on the end face of the bearing bush, and the normal and safe operation of the motor rotor and the bearing bush is ensured.

Drawings

Fig. 1 is a schematic view of the installation of a main shaft and a bearing bush.

FIG. 2 is an enlarged view of babbitt metal worn by the journal end face due to major axial leftward shift at A in FIG. 1

Intention is.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a structural view of a front seat of the present invention.

Fig. 5 is a structural view of the rear cover of the present invention.

Fig. 6 is a state diagram of the present invention in use.

Description of reference numerals: 1-main shaft, 2-bearing bush, 3-babbit alloy, 4-shaft neck, 5-front seat and 6

Shaft sleeve, 7-thrust disc, 8-cavity, 9-rear cover bearing ring, 10-rear cover, 11-nut and 12

-a front seat pressure ring.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.

As shown in fig. 3 to 5, the axial thrust device of the motor rotor provided by the embodiment has a cavity-shaped housing, the housing is composed of a front seat 5 and a rear cover 10, the front seat 5 and the rear cover 10 have screw holes matched with each other, the front seat 5 and the rear cover are connected into a whole through bolts during installation, and all the other thrust device components are arranged in the housing.

In order to make the embodiment more clear and understandable to those skilled in the art, the structure of each component and the assembling and adjusting processes are described as follows:

(1) front seat

As shown in FIG. 4, the front seat 5 is composed of an upper and a lower semi-circular seat bodies, and the horizontal joint surfaces of the seat bodies are connected by bolts to form an integral structure.

The front seat is internally provided with 10 fan-shaped blocks, the surface of the front seat is cast with babbitt metal which can bear axial movement force of the electric rotor, and the front seat is arranged into a circular ring shape and is uniformly distributed to form a front seat bearing ring 12. Structurally, the front seat pressure ring 12 and the front seat 5 are assembled in an integral shape, so that the use is convenient. The end face of the front seat is provided with a screw hole for fixing the front seat on the end face of the bearing bush by a bolt.

(2) Back cover

The rear cover 10 part, there are 10 segments inside, form the rear cover bearing ring 9, the rear cover bearing ring 9 is assembled with the rear cover 10 to form the integral type. The shape, size, material and the like of the rear cover bearing ring 9 are the same as those of the front seat bearing ring, the position of the rear cover bearing ring corresponds to that of the front seat bearing ring, and the fan-shaped blocks of the rear cover bearing ring correspond to those of the front cover bearing ring one to one.

(3) Thrust disc

The axial empty chamber between the two bearing rings (front bearing ring and rear bearing ring) in the housing of the thrust device is a chamber 8 (see the lower half of fig. 3), which is the working position of the thrust disk 7 (see the upper half of fig. 3).

As shown in fig. 6, the thrust disc is mounted on a thin shaft portion of the shaft end of the electric rotor main shaft.

The function of the thrust disc is as follows:

(1) and pushing the axial movement force of the electric rotor on the bearing ring through the thrust disc.

(2) The position of the main shaft and the displacement of the main shaft are controlled.

4. Thrust disc assembling and adjusting process

a. Put the main shaft to the lower bearing shell in, make the main shaft at design operating position, promptly: the axial oil return clearance values at the two sides of the bearing bush are equal, and then the upper bearing bush is mounted, so that the upper bearing bush and the lower bearing bush are combined into an integral shape.

b. And fixing the front seat on the end surface of the bearing bush by using a bolt. Thus, the upper half body of the front seat and the upper bearing bush are connected into a whole; the lower half body of the front seat and the lower bearing bush are connected into a whole.

c. The thrust disc is sleeved into a thin shaft at the shaft end and is tightly attached to the sector block surface of the front seat bearing ring 12. Then, the length L of the sleeve 6 is measured in this state, and the sleeve with the length L is processed.

d. The thrust disk 7 and the sleeve 6 are screwed together by a nut 11 and fixed to the thin shaft portion of the main shaft.

e. And (3) installing the rear cover 10, and adjusting the axial clearance of the thrust disc between the front seat and the two bearing rings of the rear cover to be 0.8-1.0 mm.

The installation and adjustment work of the thrust disc is completed through the steps. Therefore, the housing of the motor rotor axial thrust device is fixed on the end face of the motor bearing bush, oil return gaps on two sides of the bearing bush can be equal when the electric rotor runs due to internal components, and the axial movement of the electric rotor is limited to be 0.8-1.0.

As described above, the present invention can be preferably realized.

Claims

1. An electric motor rotor axial thrust device, comprising: the electric rotor axial thrust device comprises a housing of an electric rotor axial thrust device consisting of a front seat (5) and a rear cover (10), and a thrust mechanism part arranged inside the housing: a rear cover pressure bearing ring (9), a front seat pressure bearing ring (12), and a thrust disc (7) arranged between the rear cover pressure bearing ring (9) and the front seat pressure bearing ring (12).

2. The electric motor rotor axial thrust device of claim 1, wherein: the front seat (5) is composed of an upper seat body and a lower seat body which are matched with each other.

3. The electric motor rotor axial thrust device of claim 2, wherein: the front seat bearing ring (12) and the rear cover bearing ring (9) are composed of 10 fan-shaped blocks which are uniformly distributed, and the fan-shaped blocks of the front seat bearing ring and the fan-shaped blocks of the rear cover bearing ring are in one-to-one correspondence.

4. An electric motor rotor axial thrust device according to claim 3, wherein: and the axial clearance between the thrust disc (7) and the front seat bearing ring (12) and the rear cover bearing ring (9) is 0.8-1.0 mm.

5. The electric motor rotor axial thrust device of claim 4, wherein: the front seat (5) and the rear cover (10) are respectively provided with a screw hole, and the front seat and the rear cover are connected into a whole through the screw holes by bolts.

6. An electric motor rotor axial thrust device according to claim 5, wherein: the end face of the front seat (5) is provided with a screw hole, and the front seat (5) is fixed on the end face of the bearing bush through a bolt.