A composite seal structure at the end of a high-speed electric spindle

Abstract

The present invention discloses a composite seal structure at the end of a high-speed electric spindle, which includes a dust cover, a seal cover, a sealing ring, a front cover, a front bearing chamber, a bearing assembly and a rotating shaft; the bearing assembly is overly connected to the front bearing chamber, the rotating shaft is interference-fitted with the bearing assembly and locked by the seal cover, the seal cover is installed at the end of the rotating shaft, the front cover is installed at the end of the front bearing chamber, and the sealing ring is interference-fitted inside the front cover; the present invention adopts a composite seal structure, and at the same time: air curtain seal, siphon seal air path, circulating seal, labyrinth seal. The designed structure of the composite seal effectively improves the sealing performance and prevents oil mist and water mist from entering the bearing interior. During actual use, the sealing effect is good, the seal structure is simple, and the sealing use cost is low.

Description

Technical Field

[0001] The present invention relates to a composite seal structure at the end of a high-speed motorized spindle, belonging to the technical field of motorized spindles. Background Art

[0002] In the existing technology of the end seal of a motorized spindle, compressed air is used as the medium, and the seal structure is a single air chamber seal, with poor sealing performance. To overcome the deficiencies of the existing technology, the purpose of the present invention is to provide a composite seal structure at the end of a high-speed motorized spindle, which has high working performance, good sealing effect, simple seal structure, and low seal usage cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a composite seal structure at the end of a high-speed motorized spindle to solve the defect of poor sealing in the existing technology.

[0004] A composite seal structure at the end of a high-speed motorized spindle includes a dust cover, a seal cover, a sealing ring, a front cover, a front bearing chamber, a bearing assembly, and a rotating shaft; the bearing assembly is over-connected with the front bearing chamber, the rotating shaft is interference-fitted with the bearing assembly and locked by the seal cover, the seal cover is installed at the end of the rotating shaft, the front cover is installed at the end of the front bearing chamber, and the sealing ring is interference-fitted inside the front cover.

[0005] Preferably, after the front cover, the sealing ring, and the seal cover are installed, a clearance seal chamber and a clearance labyrinth seal chamber are respectively formed.

[0006] Preferably, after the seal cover, the dust cover, and the front cover are assembled, a sealed gas storage chamber and an air path annular outlet are formed.

[0007] Preferably, siphon holes are evenly distributed in the circumferential direction of the sealing ring, a siphon channel is provided inside the front cover, and the dust cover is provided with an air inlet, a jet port, and a siphon port. During operation, compressed air enters through the air inlet, forms a high-speed air flow through the jet port and is sprayed into the sealed gas storage chamber, and then flows out through the air path annular outlet to form an air curtain seal.

[0008] Preferably, a siphon air cavity is formed between the sealing ring and the front cover after installation, and the high-speed air flow sprayed from the jet port makes the siphon port, the siphon channel, and the siphon air cavity in a negative pressure state.

[0009] Preferably, the siphon holes, the siphon channel, and the siphon port form a siphon air path, and the air curtain seal, the clearance seal chamber, and the siphon air path form a circulating air path.

[0010] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. The present invention adopts a composite sealing structure, namely: air curtain seal, siphon seal air path, circulating seal, and labyrinth seal. The design structure of the composite seal effectively improves the sealing performance and prevents oil mist and water mist from entering the bearing interior. During actual use, the sealing effect is good, the sealing structure is simple, and the sealing use cost is low.

[0011] 2. The present invention can effectively save the consumption of compressed air. During actual operation, only a gas source of 0.1 MPa and 60 L / min is required to meet the usage, and the usage cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a sectional view of the structure of the present invention.

[0013] In the figure: 1. Dust-proof cover; 2. Sealing cover; 3. Sealing ring; 4. Front cover; 5. Front bearing chamber; 6. Bearing assembly; 7. Rotating shaft; 21. Annular air path outlet; 22. Sealed gas storage cavity; 23. Jet port; 24. Air inlet; 25. Siphon port; 26. Siphon channel; 27. Siphon air cavity; 28. Siphon hole; 29. O-ring; 30. Clearance seal cavity; 31. Clearance labyrinth seal cavity. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0015] As Figure 1 shown, a high-speed electric spindle end composite sealing structure is disclosed, including a dust-proof cover 1, a sealing cover 2, a sealing ring 3, a front cover 4, a front bearing chamber 5, a bearing assembly 6 and a rotating shaft 7; the bearing assembly 6 is connected to the front bearing chamber 5 in an excessive manner, the rotating shaft 7 is in interference fit with the bearing assembly 6, and is locked by the sealing cover 2 installed at the front end of the rotating shaft 7. The front cover 4 is fixedly installed at the front end of the front bearing chamber 5 by screws, and is locked by the sealing cover 2 and presses the bearing assembly 6. An O-ring 29 is provided between the front cover 4 and the front bearing chamber 5. The sealing cover 2 is installed at the end of the rotating shaft 7, the front cover 4 is installed at the front end of the front bearing chamber 5, the sealing ring 3 is fixedly installed in the front cover 4 in an interference manner, and the dust-proof cover 1 is fixedly installed at the front end of the front cover 4 by screws.

[0016] In this embodiment, the front cover 4, the sealing ring 3, and the sealing cover 2 are all coaxially installed. After the front cover 4, the sealing ring 3, and the sealing cover 2 are installed, a clearance seal cavity 30 and a clearance labyrinth seal cavity 31 are respectively formed. The clearance seal cavity 30 and the clearance labyrinth seal cavity 31 constitute the labyrinth seal structure of the present invention.

[0017] In this embodiment, to further enhance the sealing effect and prevent water mist and oil mist from entering the bearing assembly 6, a circulating gas path is also provided in the present invention. The specific example is as follows: After the sealing cover 2, the dust cover 1, and the front cover 4 are assembled, a sealed gas storage cavity 22 and a gas path annular outlet 21 are formed; the sealing ring 3 is evenly distributed with siphon holes 28 in the circumferential direction, a siphon channel 26 is provided in the front cover 4, and the dust cover 1 is provided with an air inlet 24, a jet port 23, and a siphon port 25. During operation, compressed air enters through the air inlet 24, forms a high-speed air flow through the jet port 23 and is sprayed into the sealed gas storage cavity 22, and then flows out through the gas path annular outlet 21 to form an air curtain seal.

[0018] An air-sucking cavity 27 is formed between the sealing ring 3 and the front cover 4 after installation. The high-speed air flow ejected from the jet port 23 makes the siphon port 25, the siphon channel 26, and the air-sucking cavity 27 in a negative pressure state.

[0019] In this embodiment, during operation, if external water mist or oil mist enters the clearance seal cavity (30), the oil mist will be discharged along the siphon air path through the air curtain seal. The siphon holes 28, the siphon channel 26, and the siphon port 25 form a siphon air path. The air curtain seal, the clearance seal cavity 30, and the siphon air path form a circulating gas path.

[0020] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A composite seal structure at the end of a high-speed electric spindle, characterized in that, It includes a dust cover (1), a sealing cover (2), a sealing ring (3), a front cover (4), a front bearing chamber (5), a bearing assembly (6) and a rotating shaft (7); the bearing assembly (6) is overly connected to the front bearing chamber (5), the rotating shaft (7) is in interference fit with the bearing assembly (6) and is locked by the sealing cover (2), the sealing cover (2) is installed at the end of the rotating shaft (7), the front cover (4) is installed at the end of the front bearing chamber (5), and the sealing ring (3) is installed in the front cover (4) by interference fit; The sealing ring (3) is evenly distributed with siphon holes (28) around its circumference, a siphon channel (26) is provided in the front cover (4), and the dust cover (1) is provided with an air inlet (24), a jet port (23) and a siphon port (25). During operation, compressed air enters through the air inlet (24), forms a high-speed air flow through the jet port (23) and is sprayed into the sealed gas storage cavity (22), and then flows out through the annular air path outlet (21) to form an air curtain seal; An air suction cavity (27) is formed between the sealing ring (3) and the front cover (4) after installation, and the high-speed air flow sprayed from the jet port (23) makes the siphon port (25), the siphon channel (26) and the air suction cavity (27) in a negative pressure state; The siphon holes (28), the siphon channel (26) and the siphon port (25) form a siphon air path, and the air curtain seal, the clearance seal cavity (30) and the siphon air path form a circulating air path.

2. The composite seal structure at the shaft end of the high-speed motorized spindle according to claim 1, wherein The front cover (4), the sealing ring (3) and the sealing cover (2) respectively form a clearance seal cavity (30) and a clearance labyrinth seal cavity (31) after installation.

3. The composite seal structure at the shaft end of the high-speed motorized spindle according to claim 2, characterized in that, The sealing cover (2), the dust cover (1) and the front cover (4) form a sealed gas storage cavity (22) and an annular air path outlet (21) after assembly.

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