Sealing structure for high-speed motor bearing lubricating oil
By adopting a "one-movement and one-static" sealing design in high-speed motor bearings, and using the combination of piston ring cage and piston ring, the problems of oil leakage and material wear during high-speed operation of the motor bearing seal structure are solved, achieving safe and reliable sealing effect and long-life use.
Patent Information
- Application Number
- CN202421864250.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-02
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-02
AI Technical Summary
The existing motor bearing seal structure is prone to oil leakage when operating at high speed, and material wear leads to leakage and frictional heat generation problems.
A sealing design of "one movement and one static" is adopted, including a piston ring cage and a piston ring. The piston ring cage rotates synchronously with the motor shaft. The piston ring is bonded to the inner wall of the flange through its own elastic tension, forming an oil storage chamber that communicates with the oil injection hole and the oil outlet hole to ensure that lubricating oil does not leak.
It realizes safe and reliable sealing during high-speed operation, avoids lubricant leakage and material wear, extends service life and reduces material costs.
Smart Images
Figure CN222937242U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bearing sealing structures, and relates to a sealing structure for lubricating oil of a high-speed motor bearing. Background Art
[0002] The sealing structures of conventional motor bearing covers include oil seal sealing, labyrinth sealing, sealing rings, sealant sealing, etc. For example, for the single oil seal sealing of a motor shaft, the skeleton oil seal is usually divided into a single-lip oil seal and a double-lip oil seal. After common skeleton oil seals are used for a certain period of time, users will report oil leakage and oil saving at the oil seal. The sealing ability of the skeleton oil seal depends on the thickness of the oil film. When the oil film thickness is too large, the oil seal is not tightly sealed. When the oil film is too small, the oil seal over-friction with the shaft causes wear of the oil seal lip and the journal. In addition, poor assembly of the oil seal is also a main cause of leakage. The labyrinth seal is another sealing device used for rotating motors. It consists of a series of annular, intersecting or spiral channels, and restricts the fluid outflow by surrounding the seal. In view of the sealing principle of the labyrinth seal, it itself requires a certain installation space to construct a series of annular, intersecting or spiral channels, and the longer the channels, the better the sealing effect. Therefore, it should be reasonably selected according to the space in industrial applications. Using a sealing ring for sealing is generally mostly used for static sealing structures, and generally not used for dynamic sealing structures of rotating machinery to avoid problems such as wear of the sealing ring material, leakage and heat generation due to friction. Therefore, a sealing structure for lubricating oil of a high-speed motor bearing is designed to overcome the above problems. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies existing in the prior art, and to provide a sealing structure for lubricating oil of a high-speed motor bearing with a simple, reasonable and compact structure, small occupied space, long service life, low material cost, safety and reliability.
[0004] The utility model is realized by the following technical solutions: A sealing structure for lubricating oil of a high-speed motor bearing includes a bearing, a motor rotating shaft installed on the inner ring of the bearing, and a flange plate arranged outside the bearing. The flange plate is vertically provided with an oil injection hole and an oil outlet hole penetrating through the flange plate. At the top of both the oil injection hole and the oil outlet hole, a cover plate that can be opened and closed is installed. A piston ring retainer is sleeved on the outer side wall of the motor rotating shaft between the flange plate, the bearing and the motor rotating shaft. At least one assembly groove is further provided on the piston ring retainer, and a piston ring is correspondingly installed in each assembly groove. The side of the piston ring away from the motor rotating shaft is in contact with the inner side wall of the flange plate. The piston ring retainer is adjacent to the bearing, and there is a gap between them to form an oil storage chamber. The oil storage chamber is respectively communicated with the oil injection hole and the oil outlet hole. Lubricating oil is injected into the oil storage chamber through the oil injection hole to lubricate the outer surface of the bearing. The piston ring retainer drives the rotation when the motor rotating shaft rotates, and the piston ring tightly adheres to the inner side wall of the flange plate by its own elastic tension.
[0005] Preferably, the number of assembly grooves on the piston ring cage is two, and one piston ring is installed in each assembly groove. The piston ring is a circular ring structure with an opening in its free state. At both ends of the opening of the piston ring, a first connecting portion and a second connecting portion with the same shape and opposite settings are respectively provided. After the piston ring is sleeved on the piston ring cage, the first connecting portion and the second connecting portion are combined together by the pressing of the inner side wall of the flange, so that the compressed piston ring is integrally a circular ring structure.
[0006] Preferably, both the first connecting portion and the second connecting portion of the piston ring are hook structures in an L-shaped structure. By pressing the first connecting portion and the second connecting portion, they are hooked to each other, and a flat surface is formed between the combined first connecting portion and the second connecting portion, so as to ensure that the outer diameter of the compressed piston ring is the same as the inner diameter of the inner side wall of the flange and the stability of the piston ring after installation. During the rotation of the motor rotating shaft, the piston ring always remains stationary and does not rotate with the rotation of the motor rotating shaft and the piston ring cage.
[0007] Preferably, the piston ring cage and the motor rotating shaft are connected by a hot sleeve interference fit.
[0008] Preferably, the bearing is a single-row angular contact ball bearing.
[0009] Preferably, the piston ring is made of a high wear-resistant alloy of Cu or Cr or Mo or a combination thereof.
[0010] The beneficial effects of the present utility model are as follows:
[0011] The present utility model adopts a "one moving and one static" sealing design. Here, the "one moving" refers to the piston ring cage that is interference-fitted with the motor rotating shaft by hot sleeve, which rotates at a high synchronous speed with the motor rotating shaft during operation; the "one static" refers to the two piston rings assembled in the piston ring grooves, which have no material wear, occupy a small space, have a long service life, and low material cost. It is safe and reliable during the high-speed operation of the motor, and is actually a reliable sealing structure for the lubricating oil of the high-speed motor bearing oil lubrication. The bearing of the present utility model is selected as a single-row angular contact ball bearing (open type), and the bearing lubrication adopts drip lubrication. The lubricating oil is dripped into the bearing through the round hole on the bearing cover and flows out of the bearing chamber through the round hole under the end cover. The design advantages of the sealing structure of the present utility model are low cost, cost savings; safe and reliable during high-speed operation; long service life and no wearing parts. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic diagram of the overall structure of the present utility model.
[0013] Figure 2 It is a schematic diagram of the structure of the piston ring cage.
[0014] Figure 3 It is a structural schematic diagram (open state) before the piston ring is installed.
[0015] Figure 4 It is a structural schematic diagram (closed state) after the piston ring is installed. Specific embodiments
[0016] To enable those of ordinary skill in the art to more clearly understand the purpose, technical solution, and advantages of the present utility model, the following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments.
[0017] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "lateral", "vertical", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and does not indicate or imply that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0018] The following will introduce the present utility model in detail with reference to the accompanying drawings: As Figure 1-2 shown, a sealing structure for the lubricating oil of a high-speed motor bearing includes a bearing 1, a motor rotating shaft 2 installed on the inner ring of the bearing 1, and a flange 3 provided on the outer side of the bearing 1. A lubricating oil injection hole 4 and an oil outlet hole (not shown in the figure) penetrating the flange 3 are vertically provided on the flange 3. At the top of both the lubricating oil injection hole 4 and the oil outlet hole, a cover plate 10 that can be opened and closed is installed. A piston ring retainer 5 is sleeved on the outer side wall of the motor rotating shaft 2 between the flange 3, the bearing 1, and the motor rotating shaft 2. At least one assembly groove 6 is further provided on the piston ring retainer 5, and a piston ring 7 is correspondingly installed in each assembly groove 6. The side of the piston ring 7 away from the motor rotating shaft 2 is in contact with the inner side wall of the flange 3. The piston ring retainer 5 is adjacent to the bearing 1, and there is a gap therebetween to form an oil storage chamber, and the oil storage chamber is respectively communicated with the lubricating oil injection hole 4 and the oil outlet hole. Lubricating oil is injected into the oil storage chamber through the lubricating oil injection hole 4 to lubricate the outer surface of the bearing 1. The piston ring retainer 5 drives the rotation when the motor rotating shaft 2 rotates, and the piston ring 7 tightly adheres to the inner side wall of the flange 3 by its own elastic tension. The piston ring is made of a high wear-resistant alloy of Cu or Cr or Mo or a combination thereof to ensure the overall strength and wear resistance, thereby improving the service life.
[0019] The number of the assembly grooves 6 on the piston ring carrier 5 is two, and one piston ring 7 is installed in each assembly groove 6. In a free state, the piston ring 7 is a circular ring structure with an opening. At both ends of the opening and on the piston ring, first connecting parts 8 and second connecting parts 9 which have the same shape and are arranged in a positive and negative manner are respectively provided. After the piston ring 7 is sleeved on the piston ring carrier 5, the first connecting part 8 and the second connecting part 9 are combined together by the pressing of the inner side wall of the flange 3, so that the compressed piston ring 7 is integrally in a circular ring structure.
[0020] As Figure 3-4 shown, both the first connecting part 8 and the second connecting part 9 of the piston ring 7 are hook structures in an L-shaped structure. By pressing the first connecting part 8 and the second connecting part 9, the two are hooked to each other, and a flat surface is formed between the combined first connecting part 8 and the second connecting part 9, so as to ensure that the outer diameter of the compressed piston ring 7 is the same as the inner diameter of the inner side wall of the flange 3 and the stability of the piston ring 7 after installation. During the rotation of the motor rotating shaft 2, the piston ring 7 always remains stationary and does not rotate with the rotation of the motor rotating shaft 2 and the piston ring carrier 5. A thermal sleeve interference fit connection is adopted between the piston ring carrier 5 and the motor rotating shaft 2. The bearing 1 is a single-row angular contact ball bearing.
[0021] The utility model is a sealing structure for lubricating oil in the axial direction. By adopting a "one moving and one static" sealing method, it is ensured that the high-speed bearing does not leak oil during operation. The piston ring is in an open style in a free state. During the process of installing the piston ring into the piston ring carrier, the hooks of the piston ring are hooked to each other by pressing both sides. Then, during the process of assembling the motor bearing cover, it is slid into the limiting space. At this time, the limiting space of the bearing cover will limit the springing size of the piston ring. The outer diameter of the compressed piston ring is kept consistent with the inner diameter of the limiting space of the bearing cover. During the subsequent rotation of the motor, the piston ring always remains stationary and does not rotate with the rotation of the motor rotating shaft and the piston ring carrier. When the lubricating oil flows to the piston ring carrier, the high-speed rotation of the piston ring will throw the lubricating oil towards the inner wall surface of the limiting space. Since there is a stationary piston ring installed on the inner wall surface, the lubricating oil reaching there will not further flow out axially and can only return to the bearing chamber and flow out through the oil outlet hole below the end cover of the bearing chamber.
[0022] The specific embodiments described herein are only illustrative of the principles and effects of the utility model, and are not used to limit the utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the utility model should still be covered by the claims of the utility model.
Claims
1. A sealing structure for lubricating oil in a high-speed motor bearing, comprising a bearing (1), a motor shaft (2) mounted on the inner ring of the bearing (1), and a flange (3) arranged on the outer side of the bearing (1), wherein the flange (3) is vertically provided with an oil filling hole (4) and an oil outlet hole penetrating the flange (3), and an openable and closable cover plate (10) is installed on the top of the oil filling hole (4) and the oil outlet hole, characterized in that: A piston ring holder (5) is sleeved on the outer wall of the motor shaft (2) between the flange (3), the bearing (1) and the motor shaft (2). The piston ring holder (5) is also provided with at least one assembly groove (6). A piston ring (7) is correspondingly installed in each assembly groove (6). The piston ring (7) is in contact with the inner wall of the flange (3) on the side away from the motor shaft (2). The piston ring holder (5) is adjacent to the bearing (1) and a gap is left between them to form an oil storage chamber. The oil storage chamber is respectively connected to the oil injection hole (4) and the oil outlet hole. Lubricating oil is injected into the oil storage chamber through the oil injection hole (4) to lubricate the outer surface of the bearing (1). The piston ring holder (5) is driven to rotate when the motor shaft (2) rotates. The piston ring (7) is tightly in contact with the inner wall of the flange (3) by its own elastic tension.
2. The sealing structure of high-speed motor bearing lubricating oil according to claim 1 is characterized in that: The number of the assembly grooves (6) on the piston ring holder (5) is two, and a piston ring (7) is installed in each assembly groove (6). The piston ring (7) is a circular ring structure with an opening in a free state, and a first connecting portion (8) and a second connecting portion (9) of the same shape and arranged in positive and negative directions are respectively arranged at the two ends of the piston ring at the opening. When the piston ring (7) is inserted into the piston ring holder (5), the first connecting portion (8) and the second connecting portion (9) are combined together by pressing the inner side wall of the flange (3), so that the compressed piston ring (7) has a circular ring structure as a whole.
3. The sealing structure of high-speed motor bearing lubricating oil according to claim 2 is characterized in that: The first connecting portion (8) and the second connecting portion (9) of the piston ring (7) are both L-shaped hook structures. By pressing the first connecting portion (8) and the second connecting portion (9), the two are hooked with each other, and a flat surface is formed between the first connecting portion (8) and the second connecting portion (9) after being combined, thereby ensuring that the outer diameter of the piston ring (7) after compression is the same as the inner diameter of the inner wall of the flange (3) and the stability of the piston ring (7) after installation. When the motor shaft (2) is rotating, the piston ring (7) always remains stationary and does not rotate with the rotation of the motor shaft (2) and the piston ring holder (5).
4. The sealing structure of high-speed motor bearing lubricating oil according to claim 3 is characterized in that: The piston ring retainer (5) and the motor shaft (2) are connected by means of a shrink-fit interference fit.
5. The sealing structure of high-speed motor bearing lubricating oil according to claim 1 is characterized in that: The bearing (1) is a single-row angular contact ball bearing.