Explosion-proof large motor bearing mechanism

Abstract

The utility model provides an explosion-proof type large motor bearing mechanism, and relates to the field of explosion-proof type large motor bearing carrying capacity structures, the explosion-proof type large motor bearing mechanism comprises end covers, an inner cover, an outer cover, a ball bearing, a ball bearing and a shaft, the end covers are fixed at two ends of a motor stator, the ball bearing and the ball bearing are installed on the shaft in a matched mode, and the inner cover is fixed on the outer cover. The inner cover is assembled on the inner side of the ball bearing, and the outer cover is assembled on the outer side of the ball bearing. According to the utility model, the problem of poor bearing capacity of a large-scale ball bearing can be solved by selecting a mode of simultaneously placing two bearings, one ball bearing and another ball bearing on one side of the motor, the axial direction of the ball bearing can prevent the motor from tilting and the axial movement of the rotor, and the ball bearing can effectively solve the problem of radial force of the motor; narrow-series bearings are selected as the ball bearing and the ball bearing respectively, the two sets of shafts are used together in a matched mode, the reliability, the size and the price are all lower than those of a large ball bearing, and therefore the bearing capacity of the explosion-proof type large motor bearing can be smoothly improved.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof large motor bearing load-bearing capacity structure, and in particular to an explosion-proof large motor bearing mechanism. Background Technology

[0002] Coal mining equipment is primarily used in the largely enclosed underground environment, and the unique nature of this environment necessitates that the equipment be safe, reliable, and compact. Electric motors, as commonly used equipment in coal mines, need to be designed to be explosion-proof and small in size. In recent years, my country's coal mining industry has shifted from small-scale to large-scale, digital, and intelligent mines. However, regardless of this transformation, the use of explosion-proof motors remains indispensable. The capacity of these motors has grown from primarily 40kW in the past to 3000kW motors now being used in some coal mines. The increase in motor capacity far exceeds the increase in motor size; motor capacity has increased nearly 75 times, while motor size has increased approximately 6 times, posing new challenges to the design and implementation of explosion-proof motors.

[0003] During operation, explosion-proof electric motors, due to the special environment of mines, cannot maintain a horizontal or vertical shaft end and must always be tilted at a certain angle. Therefore, the bearings assisting the motor rotation need to use ball bearings on one end and cylindrical roller bearings with higher load-bearing capacity on the other. To prevent axial movement of the rotor after the explosion-proof motor tilts, the ball bearing needs to bear both axial force and radial force from the motor rotation, while the cylindrical roller bearing only needs to bear radial force. Ball bearings rely on round balls to assist the motor rotation, and the round balls make point contact when rotating in the bearing raceway, meaning their load-bearing capacity is relatively poor. During motor operation, they bear both axial and radial forces, so larger sizes are generally chosen to improve reliability. Cylindrical roller bearings rely on cylindrical rollers to assist the motor rotation, and the cylindrical rollers make line contact with the raceway, resulting in higher load-bearing capacity, so smaller sizes can be appropriately selected. Due to the increase in motor capacity, the selection of ball bearings cannot be unlimited in terms of motor space and cost. Therefore, the selection of ball bearings has reached a bottleneck. To ensure the motor prevents axial movement and maintains reliability, a new bearing structure is needed to improve the load-bearing capacity of the bearings in explosion-proof large motors. Summary of the Invention

[0004] The purpose of this invention is to provide an explosion-proof bearing mechanism for large electric motors.

[0005] An explosion-proof bearing mechanism for a large electric motor includes an end cover, an inner cover, an outer cover, a ball bearing, a roller bearing, and a shaft. The end cover is fixed to both ends of the motor stator. The ball bearing and roller bearing are fitted together on the shaft. The inner cover is fitted inside the ball bearing, and the outer cover is fitted outside the roller bearing.

[0006] Preferably, both narrow-series ball bearings and roller bearings are installed at one end of the shaft.

[0007] Due to the increased power and special characteristics of explosion-proof motors, ball bearings are often used for fixation at one end. However, ball bearings have relatively poor load-bearing capacity. This invention addresses this issue by using a dual-bearing system: a ball bearing and a roller bearing are placed on one side of the motor. This solves the problem of the poor load-bearing capacity of large ball bearings. The axial bearing of the ball bearing prevents the motor from tilting or the rotor from moving axially, while the roller bearing effectively addresses the radial force problem. Narrow-series bearings are selected for both the ball bearing and roller bearing. Using these two sets of bearings together results in lower reliability, size, and price compared to a single large ball bearing. This effectively solves the problem of increasing the load-bearing capacity of large explosion-proof motors. This invention replaces the original large ball bearing by installing both the narrow-series ball bearing and roller bearing at one end of the shaft, solving the space problem at the bearing installation location in large explosion-proof motors. The combined load-bearing capacity of the narrow-series ball bearing and roller bearing is far higher than that of a single large ball bearing with the same inner diameter, while also significantly reducing costs. Attached Figure Description

[0008] Figure 1 A schematic diagram of the structure of the explosion-proof large motor bearing mechanism and its assembly with the motor;

[0009] In the diagram: End cap 1, Inner cap 2, Outer cap 3, Ball bearing 4, Roller bearing 5, Shaft 6, Machine base 7. Detailed Implementation

[0010] To make the technical solution of this utility model easier to understand, the technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings and specific embodiments.

[0011] Please see Figure 1 The explosion-proof large motor bearing mechanism includes an end cover 1, an inner cover 2, an outer cover 3, a ball bearing 4, a roller bearing 5, and a shaft 6. The end cover 1 is fixed to both ends of the motor stator and is fixedly connected to the motor base 7 by screws. The ball bearing 4 and the roller bearing 5 are fitted together on the shaft 6. The inner cover 2 is fitted inside the ball bearing 4, and the outer cover 3 is fitted outside the roller bearing 5.

[0012] Narrow-series ball bearings 4 and 5 are both installed at one end of shaft 6. Due to the increased power and special characteristics of explosion-proof motors, ball bearings are required at one end for fixation. However, ball bearings have relatively poor load-bearing capacity. This invention uses a dual-bearing design, placing one ball bearing and one 5 on one side of the motor. This solves the problem of the poor load-bearing capacity of large ball bearings. The axial bearing prevents the motor from tilting or the rotor from moving axially, while the 5 effectively addresses the radial force issue. Narrow-series ball bearings are selected for both the ball and 5. Using these two sets of bearings together results in lower reliability, size, and price compared to a single large ball bearing. This effectively increases the load-bearing capacity of large explosion-proof motor bearings. This invention replaces the original large ball bearing by installing narrow-series ball bearings at one end of the shaft, solving the space problem at the bearing installation location in large explosion-proof motors. The combined load-bearing capacity of the narrow-series ball bearings and 5 is far higher than that of a single large ball bearing with the same inner diameter, while also significantly reducing costs.

[0013] It should be noted that the embodiments described herein are only some embodiments of this utility model, and not all implementations of this utility model. These embodiments are merely illustrative and are intended only to provide a more intuitive and clear way of understanding the content of this utility model, not to limit the technical solutions described herein. All other implementation methods that can be conceived by those skilled in the art without creative effort, as well as other simple substitutions and variations of the technical solutions of this utility model, without departing from the concept of this utility model, are within the protection scope of this utility model.

Claims

1. A large electric motor bearing mechanism with explosion-proof features: The explosion-proof large motor bearing mechanism includes end covers, inner covers, outer covers, ball bearings, roller bearings, and shafts. The end covers are fixed at both ends of the motor stator. The ball bearings and roller bearings are fitted together on the shaft. The inner cover is fitted inside the ball bearings, and the outer cover is fitted outside the roller bearings.

2. The explosion-proof large motor bearing mechanism as described in claim 1, characterized in that: Narrow-series ball bearings and roller bearings are all mounted on one end of the shaft.

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