Bearing chamber structure of vertical variable frequency speed regulation three-phase asynchronous motor

Abstract

The utility model discloses a bearing chamber structure of a vertical variable frequency speed regulation three-phase asynchronous motor, and relates to the technical field of bearing chambers. The inner ring of the angular contact bearing is in interference fit with a rotating shaft bearing retainer; the bearing inner cover is used for clamping the angular contact bearing outer ring and is positioned on the angular contact bearing; the engine base end cover assembly is combined below the bearing inner cover, an oil injection channel is processed on the engine base end cover assembly, and lubricating grease is pressed into the bearing inner cover through the oil injection channel; when the rotating shaft rotates, lubricating grease is thrown into the bearing chamber under the action of centrifugal force; the straight-through forced filling oil cup is connected with the oil filling channel and used for providing lubricating grease; the labyrinth ring is clamped below the angular contact bearing and is in clearance fit with the rotating shaft; and the bearing outer cover is clamped with a spigot on the outer side of the engine base end cover assembly. Lubricating grease can be regularly injected into the bearing to ensure the performance of the bearing; and the inner circle of the base iron core and the inner circle of the bearing are coaxial, so that the mechanical strength of the motor is high, and the vibration noise is low.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing chambers, in particular to a bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor. Background Art

[0002] In the mine transportation system, mining electric locomotives are key equipment and play a core role in the transportation tasks of pulling mining cars, rickshaws, etc. in the main transportation lanes. In view of the compact internal space of mining electric locomotives, vertical variable frequency three-phase asynchronous motors are used as the driving core of the electric locomotive to optimize space utilization and improve transportation efficiency.

[0003] As one of the core components of rotating motors, the performance of bearings is directly related to the stable operation and service life of the motor. In view of its vulnerable characteristics, special attention is paid to the reasonable structure of the bearing chamber during the design process, aiming to ensure that the bearing can maintain efficient and stable operation in harsh mine environments through scientific structural design, thereby effectively extending the overall service life of the motor. However, the bearing chamber of the existing vertical variable frequency motor still has the following problems:

[0004] 1. The traditional 22kw vertical variable frequency motor has the problems of small size, compact structure and difficulty in replacing grease;

[0005] 2. The bearing chamber loses grease too quickly, resulting in poor lubrication and heat dissipation, which leads to a short bearing life;

[0006] 3. The lower support end cover is subjected to high cycle fatigue stress, which causes the fastening bolts between the end cover and the machine base to be easily damaged;

[0007] 4. Due to the large vibration impact, the joint between the end cover and the base is easy to loosen, resulting in the problem of loud motor noise. Utility Model Content

[0008] The purpose of the utility model is to provide a bearing chamber structure of a vertical variable frequency speed regulation three-phase asynchronous motor, which welds the lower support end cover and the base into a whole, improves the connection strength between the base and the end cover, and the coaxiality between the inner circle of the base iron core and the inner circle of the bearing, reduces the motor noise; and can also slow down the loss of grease.

[0009] To achieve the above purpose, the present application proposes a bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor, comprising:

[0010] Angular contact bearing, whose inner ring has interference fit with the shaft bearing block;

[0011] The bearing inner cover is used to clamp the outer ring of the angular contact bearing and is located on the angular contact bearing;

[0012] The base end cover assembly is assembled under the bearing inner cover. An oil injection channel is processed on the base end cover assembly, and the grease is pressed into the bearing inner cover through the oil injection channel; when the shaft rotates, the grease is thrown into the bearing chamber under the action of centrifugal force;

[0013] A straight-through pressure oiling cup connected to the oiling channel is used to provide grease;

[0014] The labyrinth ring is clamped under the angular contact bearing and has clearance fit with the rotating shaft;

[0015] The outer bearing cover is snap-fitted with the outer stopper of the base end cover assembly.

[0016] Furthermore, the end face of the inner ring of the labyrinth ring is clamped with the inner ring of the angular contact bearing, and the end face of the outer ring of the labyrinth ring is clamped with the outer ring of the angular contact bearing.

[0017] Furthermore, the angular contact bearings are provided in a pair, and at least two labyrinth rings are provided.

[0018] Furthermore, a round nut sleeved on the rotating shaft is provided on the outer side of the labyrinth ring, and a brake gasket is provided between the round nut and the labyrinth ring.

[0019] Furthermore, a skeleton oil seal is provided outside the bearing outer cover.

[0020] Furthermore, the inner stop of the bearing chamber of the base end cover assembly is sequentially clamped with the outer ring of the labyrinth ring and the outer ring of the angular contact bearing.

[0021] Furthermore, the oil injection channel is L-shaped.

[0022] Furthermore, a groove is provided at the connection between the bearing inner cover and the machine base end cover assembly, and a first O-ring is placed in the groove for sealing.

[0023] As a further step, a groove is provided at the connection between the bearing outer cover and the machine base end cover assembly, and a second O-ring is placed in the groove for sealing.

[0024] As a further step, the bearing inner cover and the rotating shaft are clearance-fitted.

[0025] The above technical solutions adopted by the utility model have the following advantages compared with the prior art: 1. The double angular contact bearing arrangement is adopted to solve the problem that the bearing at the transmission end of the vertical motor bears large radial and axial loads at the same time;

[0026] 2. A dedicated oil filling channel is set on the end cover to regularly add grease to the bearing to ensure bearing performance. Multiple labyrinth rings are added to the bearing chamber at the shaft extension end, and a skeleton oil seal is added to the outside of the bearing cover. This design slows down the loss of grease and extends the bearing grease replacement cycle; it can also prevent external impurities such as iron filings and dust from entering the motor.

[0027] 3. The lower support end cover and the machine base are welded into a whole, namely the machine base end cover assembly, which improves the connection strength between the machine base and the end cover, and the coaxiality between the inner circle of the machine base iron core and the inner circle of the bearing. The motor has high mechanical strength and low vibration and noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a cross-sectional view of the bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor;

[0029] Figure 2 This is the appearance diagram of a vertical variable frequency speed regulating three-phase asynchronous motor;

[0030] Among them: 1. rotating shaft; 2. bearing inner cover; 3. angular contact bearing; 4. labyrinth ring; 5. brake gasket; 6. round nut; 7. bearing outer cover; 8. skeleton oil seal; 9. first O-ring; 10. base end cover assembly; 11. second O-ring; 12. bolt; 13. gasket; 14. straight-through pressure injection oil cup. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] See also Figure 1 This embodiment provides a bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor, including:

[0037] Angular contact bearing 3, whose inner ring is interference fit with the shaft bearing block;

[0038] The bearing inner cover 2 is used for clamping the outer ring of the angular contact bearing and is located on the angular contact bearing. The bearing inner cover and the rotating shaft are clearance-fitted;

[0039] The base end cover assembly 10 is assembled under the bearing inner cover. An oil injection channel is processed on the base end cover assembly, and the grease is pressed into the bearing inner cover through the oil injection channel; when the shaft rotates, the grease is thrown into the bearing chamber under the action of centrifugal force;

[0040] A straight-through pressure oiling cup 14 is connected to the oiling channel and is used to provide lubricating grease;

[0041] The inner ring end face of the labyrinth ring is clamped with the inner ring of the angular contact bearing, and the outer ring end face is clamped with the outer ring of the angular contact bearing; the inner ring of the labyrinth ring and the rotating shaft are clearance fit; the labyrinth ring is used to prevent the internal grease from losing too quickly, and its number is increased according to the service environment.

[0042] The outer cover of the bearing is clamped with the outer stopper of the base end cover assembly, and a skeleton oil seal is arranged on the outside of the outer cover of the bearing;

[0043] The bearing inner cover, the machine base end cover assembly and the bearing outer cover are fixed together by bolts 12 and gaskets 13.

[0044] As a preferred implementation scheme provided in this embodiment, a groove is provided at the connection between the bearing inner cover and the machine base end cover assembly, and a first O-ring is placed in the groove for sealing; a groove is provided at the connection between the bearing outer cover and the machine base end cover assembly, and a second O-ring is placed in the groove for sealing.

[0045] As a preferred implementation scheme provided in this embodiment, the outermost labyrinth ring is provided with a brake gasket and a round nut to prevent axial movement.

[0046] As a preferred implementation scheme provided in this embodiment, the inner stop of the bearing chamber of the machine base end cover assembly is sequentially clamped with the outer ring of the labyrinth ring and the outer ring of the angular contact bearing.

[0047] As a preferred implementation provided in this embodiment, Figure 2 As shown, the base end cover assembly can be welded with high-strength low-alloy structural steel Q345, and heat dissipation ribs and reinforcing ribs are welded on the outside of the base end cover assembly to ensure the overall mechanical strength of the motor.

[0048] The effects of this implementation are: 1. It solves the problem of small size, compact structure and difficulty in replacing grease of traditional 22kw vertical variable frequency motors; 2. It solves the problem of short bearing life in the bearing chamber of the vertical motor due to excessive grease loss, poor lubrication and heat dissipation; 3. It solves the problem of easy damage to the fastening bolts between the end cover and the base of the lower support end cover of the vertical motor due to high cycle fatigue stress; 4. It solves the problem of looseness of the joint between the lower support end cover and the base of the vertical motor due to large vibration impact, resulting in high motor noise.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor, characterized in that: include: Angular contact bearings, whose inner ring has an interference fit with the shaft bearing block; The bearing inner cover is used to clamp the outer ring of the angular contact bearing and is located on the angular contact bearing; The base end cover assembly is assembled under the bearing inner cover. An oil injection channel is processed on the base end cover assembly, and the grease is pressed into the bearing inner cover through the oil injection channel; when the shaft rotates, the grease is thrown into the bearing chamber under the action of centrifugal force; A straight-through pressure oiling cup connected to the oiling channel is used to provide grease; The labyrinth ring is clamped under the angular contact bearing and has clearance fit with the rotating shaft; The outer bearing cover is snap-fitted with the outer stopper of the base end cover assembly.

2. According to claim 1, the bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor is characterized in that: The end face of the inner ring of the labyrinth ring is clamped with the inner ring of the angular contact bearing, and the end face of the outer ring of the labyrinth ring is clamped with the outer ring of the angular contact bearing.

3. According to claim 1, the bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor is characterized in that: The angular contact bearings are arranged in pair, and at least two labyrinth rings are arranged.

4. According to claim 1, the bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor is characterized in that: A round nut sleeved on the rotating shaft is arranged on the outer side of the labyrinth ring, and a brake pad is arranged between the round nut and the labyrinth ring.

5. According to claim 1, the bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor is characterized in that: A skeleton oil seal is arranged outside the bearing outer cover.

6. The bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor according to claim 1, characterized in that: The inner stop of the bearing chamber of the base end cover assembly is clamped with the outer ring of the labyrinth ring and the outer ring of the angular contact bearing in sequence.

7. The bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor according to claim 1 is characterized in that: The oil injection channel is L-shaped.

8. The bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor according to claim 1, characterized in that: A groove is provided at the connection between the bearing inner cover and the machine base end cover assembly, and a first O-ring is placed in the groove for sealing.

9. The bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor according to claim 1, characterized in that: A groove is provided at the connection between the bearing outer cover and the machine base end cover assembly, and a second O-ring is placed in the groove for sealing.

10. The bearing chamber structure of a vertical variable frequency speed regulating three-phase asynchronous motor according to claim 1, characterized in that: The bearing inner cover and the rotating shaft are clearance-matched.

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