Device for eliminating axial vibration of high-voltage motor and thermal expansion of bearing
By setting a cross-shaped assembly hole between the inner oil cover and the outer oil cover and inserting a high-strength spring, the bolt stress problems caused by axial vibration of the high-voltage motor and thermal expansion of the bearing are solved, and the practical performance and reliability of the device are improved.
Patent Information
- Application Number
- CN202422193828.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-09
AI Technical Summary
During operation of high-voltage motors, the rotor vibration increases and the bearing thermal expansion leads to an increase in the bolt stress connecting the inner and outer oil covers, which is prone to breaking or sliding buckles. The prior art is difficult to effectively solve this problem.
A cross-shaped assembly hole is provided between the inner oil cover and the outer oil cover, and a high-strength spring is penetrated into the hole. The high-strength spring abuts with the rotor bearing and bears bolt stress to eliminate stresses caused by axial vibration and thermal expansion of the bearing.
It effectively eliminates the stress of the motor axial vibration and bearing thermal expansion on the oil cover bolts, improves the practical performance and reliability of the device, and avoids the problems of bolts breaking or sliding buckles.
Smart Images
Figure CN223156841U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of motors, and particularly relates to a device for eliminating axial vibration and bearing thermal expansion of a high-voltage motor. Background Art
[0002] At present, the rotor bearings of high-voltage motors are all installed inside the boring holes of the motor end covers. The rotor bearings are axially positioned through the mating surfaces of the inner oil cover and the outer oil cover, and radially positioned by the boring holes of the end covers. During the operation of the motor, affected by the load thrust, the rotor needs to adjust the magnetic center line under the influence of the stator electromagnetism, and the rotor vibration will increase. At the same time, the bearing will have thermal expansion when heated, resulting in greater stress on the bolts connecting the inner oil cover and the outer oil cover, and problems such as bolt fracture or thread slipping of the inner oil cover may occur. Content of the Utility Model
[0003] The purpose of the utility model is to provide a device for eliminating axial vibration and bearing thermal expansion of a high-voltage motor to solve the above problems.
[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
[0005] A device for eliminating axial vibration and bearing thermal expansion of a high-voltage motor includes an inner oil cover and an outer oil cover. The inner oil cover and the outer oil cover are respectively provided with mating screw holes. A rotor bearing is arranged inside the inner oil cover, and a mating surface is arranged inside the outer oil cover. The mating surface is clamped inside the inner oil cover, and there is a clearance fit between the outer wall of the mating surface and the inner wall of the inner oil cover. A number of assembly holes are evenly arranged on the mating surface, and high-strength springs are inserted through the assembly holes. The free ends of the high-strength springs abut against the rotor bearing.
[0006] In order to further implement the utility model, the assembly holes are arranged in a cross shape.
[0007] In order to further implement the utility model, the assembly holes are blind holes.
[0008] In order to further implement the utility model, there is an interference fit with clearance between the inner oil cover and the rotor bearing.
[0009] The beneficial effects of the utility model compared with the prior art are as follows:
[0010] In the utility model, the inner oil cover and the outer oil cover are fixedly assembled in a left-right symmetrical manner through bolts inserted into the screw holes. The mating surface is integrally formed by turning at the front end of the outer oil cover. The mating surface is sleeved inside the inner oil cover through a clearance fit. The assembly holes are integrally formed and drilled inside the mating surface. The high-strength springs are sleeved inside the assembly holes through a clearance fit.
[0011] The utility model opens four assembly holes in a cross-shaped distribution on the rabbet of the outer oil cover. After a high-strength spring is installed in the hole and is compressed under force, the high-strength spring of the outer oil cover still outputs pressure to the rotor bearing. Thus, the high-strength spring bears the stress of the bolts connecting the inner and outer oil covers. Such a modification can eliminate the problem of large axial vibration of the motor and, at the same time, eliminate the stress on the oil cover bolts caused by the thermal expansion of the rotor bearing.
[0012] Through the structural improvement of the above device, the utility model has the advantages of eliminating axial vibration and the stress on the oil cover bolts caused by bearing thermal expansion, thus making it more practical and valuable, and effectively solving the problems and deficiencies in the prior art and equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a structural schematic diagram of the utility model;
[0014] Figure 2 is a disassembly schematic diagram of the utility model;
[0015] Figure 3 is a schematic diagram of the position of the assembly holes in the utility model;
[0016] Figure 4 is Figure 3 a cross-sectional view of
[0017] The meanings of the reference numerals are as follows: 1, inner oil cover; 2, outer oil cover; 3, rabbet; 4, assembly hole; 5, high-strength spring; 6, screw hole; 7, bolt; 101, rotor bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The following further describes the utility model in conjunction with the drawings and the detailed description of the embodiments.
[0019] As Figures 1-4 shown, a device for eliminating axial vibration and bearing thermal expansion of a high-voltage motor, characterized in that: it includes an inner oil cover 1 and an outer oil cover 2. The inner oil cover 1 and the outer oil cover 2 are respectively provided with mutually matching screw holes 6. A rotor bearing 101 is arranged inside the inner oil cover 1. The inner oil cover 1 and the rotor bearing 101 are in an interference fit with a clearance. A rabbet 3 is arranged inside the outer oil cover 2. The rabbet 3 is clamped inside the inner oil cover 1. There is a clearance fit between the outer wall of the rabbet 3 and the inner wall of the inner oil cover 1. A plurality of assembly holes 4 are evenly arranged on the rabbet 3. The assembly holes 4 are arranged in a cross shape. The assembly holes 4 are blind holes. A high-strength spring 5 is inserted through the assembly holes 4. The free end of the high-strength spring 5 abuts against the rotor bearing 101.
[0020] Before operation, first drill four assembly holes 4 evenly in a cross-shaped distribution pattern on the rabbet 3 of the outer oil cover 2, and then install the high-strength spring 5. Then, the outer oil cover 2 can be assembled facing the inner oil cover 1. After confirming that the high-strength spring 5 abuts against the rotor bearing 101 inside the inner oil cover 1 and shortens, the bolt 7 can be tightened to complete the assembly. During use, the high-strength spring 5 bears the stress of the bolt 7 connecting the inner oil cover 1 and the outer oil cover 2, and at the same time eliminates the stress of the thermal expansion bolt of the rotor bearing 101.
Claims
1. An apparatus for eliminating axial vibration and bearing thermal expansion of a high-voltage motor, characterized in that: It includes an inner oil cover (1) and an outer oil cover (2). Screwed holes (6) that cooperate with each other are respectively provided on the inner oil cover (1) and the outer oil cover (2). A rotor bearing (101) is arranged inside the inner oil cover (1), and a rabbet (3) is arranged inside the outer oil cover (2). The rabbet (3) is clamped inside the inner oil cover (1), and there is a clearance fit between the outer wall of the rabbet (3) and the inner wall of the inner oil cover (1). A number of assembly holes (4) are evenly provided on the rabbet (3), and a high-strength spring (5) is inserted through the assembly hole (4). The free end of the high-strength spring (5) abuts against the rotor bearing (101).
2. The device for eliminating axial vibration and bearing thermal expansion of a high-voltage motor according to claim 1, characterized in that: The assembly hole (4) is arranged in a cross shape.
3. The device for eliminating axial vibration and bearing thermal expansion of a high-voltage motor according to claim 1 or 2, characterized in that: The assembly hole (4) is a blind hole.
4. The device for eliminating axial vibration and bearing thermal expansion of a high-voltage motor according to claim 3, characterized in that: There is an interference fit with clearance between the inner oil cover (1) and the rotor bearing (101).