Spindle air seal structure

Abstract

The utility model discloses an air-tight sealing structure of a main shaft, relates to the field of bearing sealing, and solves the problems that the sealing structure of the main shaft in the prior art mainly adopts mechanical sealing, the sealing effect is poor, lubricant leakage is caused, dirt such as scrap iron and cutting fluid cannot be effectively prevented from entering the inner part of the main shaft, and the service life of the main shaft is prolonged. The device comprises a main shaft, a shell is coaxially arranged on the outer side of the main shaft, a gas ring assembly is arranged between one end of the shell and the main shaft, and a bearing is arranged between the other end of the shell and the main shaft; lubricating oil in the lubricating oil cavity moves along the shaft end and firstly passes through the two oil saving rings, the oil saving rings are communicated with each other, the oil return holes are formed in the lower portions of the oil saving rings in the axis direction, the oil saving rings are communicated through the oil return holes, the oil return holes are connected with the oil return pipeline, residual oil can be blocked by the inner-layer gas ring, and the residual oil can be stopped by the inner-layer gas ring. By adjusting the matching size of the two ends of the inner-layer gas ring and the test main shaft, the purpose of gas sealing is achieved.

Description

Technical Field

[0001] The utility model relates to the field of bearing sealing, in particular to a main shaft air sealing structure. Background Art

[0002] When the bearing is in use, in order to avoid the entry of contaminants, which may cause wear, corrosion or other damage to the bearing, thereby reducing the service life and reliability of the bearing, and in order to prevent the leakage of lubricant and protect the lubricant from contamination by the external environment, the bearing needs to be sealed when in use.

[0003] At present, the sealing structure of the spindle is mainly based on mechanical seals, which have poor sealing effect. Not only will it cause leakage of lubricant, but it will also fail to effectively prevent iron filings, cutting fluid and other dirt from entering the spindle, resulting in a reduced life of the spindle. Utility Model Content

[0004] The purpose of the utility model is to provide a spindle air sealing structure to solve the problem that the sealing structure of the spindle in the prior art is mainly based on mechanical sealing, which has a poor sealing effect, not only causing leakage of lubricant, but also failing to effectively prevent dirt such as iron filings and cutting fluid from entering the inside of the spindle, resulting in a reduced life of the spindle.

[0005] The technical solution adopted by the utility model is as follows: a main shaft air sealing structure, a shell is coaxially arranged on the outside of the main shaft, an air ring assembly is arranged between one end of the shell and the main shaft, a bearing is arranged between the other end of the shell and the main shaft, and a lubricating oil chamber is formed between the bearing and the shell;

[0006] An air inlet hole is opened at one end of the outer shell close to the air ring assembly along the meridian direction of the outer shell, an outer air ring is opened on the inner wall of the outer shell at the end of the air inlet hole close to the air ring assembly, an air inlet duct is opened on the air ring assembly along the meridian direction of the outer air ring, an inner air ring is opened on the inner wall of the air ring assembly at one end of the air inlet duct away from the outer air ring, the inner air ring, the air inlet hole, the outer air ring, the air inlet duct and the inner air ring are connected in sequence, an oil-saving ring is opened on the inner wall of the air ring assembly at one side of the inner air ring close to the bearing, the end of the inner air ring close to the oil-saving ring is a large clearance fit, and the end of the inner air ring away from the oil-saving ring is a small clearance fit, and an L-shaped oil return pipeline is arranged between the oil-saving ring and the lubricating oil chamber.

[0007] Furthermore, the air ring assembly and the housing are split structures.

[0008] Furthermore, two oil-saving rings are provided, and an oil return hole is opened below the oil-saving ring along the axial direction, and the oil-saving rings are connected through the oil return hole.

[0009] Furthermore, the air inlets are distributed radially with the axis of the main shaft as the center.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0011] 1. In the utility model, the lubricating oil in the lubricating oil chamber moves along the shaft end, first passing through two oil-saving rings, which are interconnected, and an oil return hole is opened below the oil-saving ring along the axial direction. The oil-saving rings are connected through the oil return hole, and the oil return hole is connected to the oil return pipeline. The remaining oil will be blocked by the inner gas ring. By adjusting the matching dimensions between the two ends of the inner gas ring and the test spindle, the purpose of air sealing is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 yes Figure 1 Cross-sectional view at AA in the middle.

[0014] Description of reference numerals:

[0015] 1. Main shaft; 2. Air ring assembly; 3. Outer shell; 4. Lubricating oil chamber; 5. Bearing; 6. Air inlet hole; 7. Oil-saving ring; 8. Inner air ring; 9. Air inlet duct; 10. Outer air ring; 11. Oil return hole; 12. Oil return pipeline. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1

[0019] Figure 1-Figure 2 As shown: a main shaft air sealing structure, a shell 3 is coaxially arranged on the outside of the main shaft 1, an air ring assembly 2 is arranged between one end of the shell 3 and the main shaft 1, a bearing 5 is arranged between the other end of the shell 3 and the main shaft 1, and a lubricating oil chamber 4 is formed between the bearing 5 and the shell 3.

[0020] An air inlet hole 6 is opened along the meridian direction of the outer shell 3 at one end of the outer shell 3 close to the air ring assembly 2, an outer air ring 10 is opened on the inner wall of the outer shell 3 at the end of the air inlet hole 6 close to the air ring assembly 2, and air inlet ducts 9 are evenly opened on the air ring assembly 2 along the meridian direction of the outer air ring 10, an inner air ring 8 is opened on the inner wall of the air ring assembly 2 at the end of the air inlet duct 9 away from the outer air ring 10, the inner air ring 8, the air inlet hole 6, the outer air ring 10, the air inlet duct 9 and the inner air ring 8 are connected in sequence, an oil-saving ring 7 is opened on the inner wall of the air ring assembly 2 on the side of the inner air ring 8 close to the bearing 5, the end of the inner air ring 8 close to the oil-saving ring 7 is a large clearance fit, and the end of the inner air ring 8 away from the oil-saving ring 7 is a small clearance fit, and an L-shaped oil return pipeline 12 is arranged between the oil-saving ring 7 and the lubricating oil chamber 4.

[0021] The gas ring assembly 2 and the housing 3 are split, which is convenient for changing the spindle size at a later time.

[0022] High-pressure air is fed into the air inlet 6. The high-pressure air first enters the outer air ring 10 through the air inlet 6, and then enters the inner air ring 8 through the evenly arranged air inlet duct 9. The evenly arranged air inlet duct 9 enables the high-pressure air to evenly enter the inner air ring 8, thereby avoiding uneven distribution of the high-pressure air in the inner air ring 8. The end of the inner air ring 8 close to the fuel-saving ring 7 is a large-gap fit, and the end of the inner air ring 8 far from the fuel-saving ring 7 is a small-gap fit. Therefore, the air flow rate at the end of the inner air ring 8 close to the fuel-saving ring 7 is lower, and the pressure is higher, which can prevent pollutants and dust. On the contrary, the air flow rate at the end of the inner air ring 8 away from the oil-saving ring 7 is faster and the pressure is lower, which is beneficial to the continuous output of the gas of the inner air ring 8 along the gap. The lubricating oil in the lubricating oil chamber 4 moves along the shaft end, first passing through the two oil-saving rings 7, the oil-saving rings 7 are interconnected, and an oil return hole 11 is opened below the oil-saving rings 7 along the axial direction. The oil-saving rings 7 are connected through the oil return hole 11, and the oil return hole 11 is connected to the oil return pipeline 12. The remaining oil will be blocked by the inner air ring 8, and the purpose of air sealing can be achieved by adjusting the matching dimensions of the two ends of the inner air ring 8 and the test spindle.

[0023] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A spindle air sealing structure, characterized in that: A housing (3) is coaxially arranged outside the main shaft (1); an air ring assembly (2) is arranged between one end of the housing (3) and the main shaft (1); a bearing (5) is arranged between the other end of the housing (3) and the main shaft (1); and a lubricating oil chamber (4) is formed between the bearing (5) and the housing (3); An air inlet hole (6) is provided at one end of the outer shell (3) close to the air ring assembly (2) along the meridian direction of the outer shell (3); an outer layer air ring (10) is provided on the inner wall of the outer shell (3) at the end of the air inlet hole (6) close to the air ring assembly (2); an air inlet duct (9) is provided on the air ring assembly (2) along the meridian direction of the outer layer air ring (10); an inner layer air ring (8) is provided on the inner wall of the air ring assembly (2) at the end of the air inlet duct (9) away from the outer layer air ring (10); the inner layer air ring (8) The air inlet hole (6), the outer air ring (10), the air inlet passage (9) and the inner air ring (8) are connected in sequence; an oil-saving ring (7) is provided on the inner wall of the air ring assembly (2) on the side of the inner air ring (8) close to the bearing (5); the end of the inner air ring (8) close to the oil-saving ring (7) is a large clearance fit, and the end of the inner air ring (8) away from the oil-saving ring (7) is a small clearance fit; an L-shaped oil return pipeline (12) is provided between the oil-saving ring (7) and the lubricating oil chamber (4).

2. A spindle air sealing structure according to claim 1, characterized in that: The gas ring assembly (2) and the housing (3) are split structures.

3. The main shaft air sealing structure according to claim 1, characterized in that: The oil-saving rings (7) are provided with two oil-return holes (11) below the oil-saving rings (7) along the axial direction, and the oil-saving rings (7) are connected through the oil-return holes (11).

4. The main shaft air sealing structure according to claim 1, characterized in that: The air inlet (9) is distributed radially with the axis of the main shaft (1) as the center.

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