Oil seal structure for high-speed rotating member in negative pressure environment

Abstract

This utility model discloses an oil sealing structure for a high-speed rotating component under negative pressure, relating to the field of mechanical transmission technology. It includes a high-speed labyrinth disk fixedly mounted on a high-speed shaft. A bearing cap is fitted around the outer periphery of the labyrinth disk, and a labyrinth structure is provided at the contact point between the bearing cap and the labyrinth disk. Both the bearing cap and the labyrinth disk are located outside the bearing. An airtight cover is fitted onto the high-speed shaft, located outside the labyrinth disk, to enclose it. The inner surface of the airtight cover in contact with the high-speed shaft has a radially recessed annular groove, forming an airtight cavity between the groove and the shaft. The airtight cover has a sealing gas inlet communicating with the airtight cavity. This utility model effectively prevents lubricating oil leakage, ensures the cleanliness of the working medium, eliminates wear, requires no maintenance, and offers superior economic and environmental benefits.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission technology, and in particular to an oil sealing structure for a high-speed rotating component under negative pressure. Background Technology

[0002] In traditional negative pressure operating environments, high-speed rotating components often experience lubricant leakage due to excessively high negative pressure. The leaked lubricant enters the working chamber, contaminating the working medium and causing economic losses or even production shutdowns. Existing lubricant sealing structures typically use sealing rings, which wear and require periodic replacement; otherwise, lubricant leakage will persist, resulting in high maintenance costs and poor economic and environmental efficiency. Utility Model Content

[0003] To address the above deficiencies, the purpose of this utility model is to provide an oil sealing structure for high-speed rotating parts under negative pressure. This oil sealing structure for high-speed rotating parts under negative pressure can effectively prevent lubricating oil leakage, ensure the cleanliness of the working medium, and guarantee normal production. At the same time, it will not cause wear, requires no maintenance costs, and has superior economic and environmental benefits.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows:

[0005] An oil sealing structure for a high-speed rotating component under negative pressure includes a high-speed labyrinth disk fixedly mounted on a high-speed shaft. A bearing cap is fitted around the outer periphery of the high-speed labyrinth disk. The bearing cap has a labyrinth structure at the contact point with the high-speed labyrinth disk. Both the bearing cap and the high-speed labyrinth disk are located outside the bearing. An airtight cover is fitted on the high-speed shaft outside the high-speed labyrinth disk, capable of enclosing the high-speed labyrinth disk. The inner surface of the airtight cover in contact with the high-speed shaft has a radially recessed annular groove, forming an airtight cavity between the annular groove and the high-speed shaft. The airtight cover has a sealing gas inlet communicating with the airtight cavity.

[0006] The maze structure includes a radial maze structure and an end-face maze structure.

[0007] The radial labyrinth structure includes an annular radial labyrinth groove that is radially recessed from the inner side of the bearing cap. Multiple radial labyrinth grooves are provided, and a radial labyrinth gap is formed between the radial labyrinth groove and the outer side of the high-speed labyrinth disk.

[0008] The end-face labyrinth structure includes a first end-face labyrinth structure disposed on the outer end face of the bearing cover and a second end-face labyrinth structure disposed on the inner end face of the high-speed labyrinth disk. The first end-face labyrinth structure and the second end-face labyrinth structure are cross-engaged, and an end-face labyrinth gap is formed between the first end-face labyrinth structure and the second end-face labyrinth structure.

[0009] The gas seal cover includes a cover portion fitted on the high-speed shaft and a connecting portion fitted on the outside of the high-speed labyrinth disk and fitting against the bearing cover. The cover portion and the connecting portion are connected as one unit through a connecting portion. The gas seal cavity and the sealing gas inlet are both located on the cover portion.

[0010] The joint is fixedly connected to the bearing cap by bolts.

[0011] The joint portion has an annular mounting groove on the end face that fits with the bearing cover, and a sealing ring is installed in the mounting groove.

[0012] The edge of the joint protrudes beyond the outer edge of the bearing cover and has an annular positioning edge that protrudes towards the bearing cover to hold the bearing cover in place.

[0013] The high-speed shaft located between the high-speed labyrinth disk and the cover is threaded with a fixing nut.

[0014] The bearing cap has a raised bearing ring at the center of its inner end face. The outer ring of the bearing is fixed between the bearing ring and the stepped surface of the bearing seat. The inner ring of the bearing is fixed between the high-speed labyrinth disk and the stepped surface of the high-speed shaft. The outer side of the bearing cap has a lubricating oil inlet. The interior of the bearing cap has a lubricating oil channel that connects the lubricating oil inlet to the bearing mounting cavity.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are:

[0016] The oil sealing structure of the high-speed rotating component under negative pressure environment of this utility model includes a high-speed labyrinth disk fixedly mounted on a high-speed shaft. A bearing cap is fitted around the outer periphery of the high-speed labyrinth disk. A labyrinth structure is provided at the contact point between the bearing cap and the high-speed labyrinth disk. Both the bearing cap and the high-speed labyrinth disk are located outside the bearing. An airtight cover is fitted on the high-speed shaft outside the high-speed labyrinth disk, which can enclose the high-speed labyrinth disk. A radially recessed annular groove is provided on the inner side of the airtight cover that contacts the high-speed shaft. An airtight cavity is formed between the annular groove and the high-speed shaft. A sealing gas inlet connected to the airtight cavity is provided on the airtight cover. In this utility model, under power drive, the high-speed shaft drives the inner ring of the bearing and the high-speed labyrinth disk to rotate at high speed. The sealing gas is forced into the airtight cavity from the sealing gas inlet, forming a positive pressure seal on the high-speed rotating high-speed shaft. At the same time, a rotating positive pressure gas seal is formed in the labyrinth structure between the high-speed labyrinth disk and the bearing cap. This invention creates a positive pressure gas seal within the gaps of the gas-tight cavity and labyrinth structure, effectively preventing lubricating oil leakage and ensuring the cleanliness of the working medium. This avoids downtime caused by lubricating oil leakage and ensures normal production. Furthermore, the absence of contact wear saves on the cost of regularly replacing parts. Additionally, the gas source is inexpensive, eliminating the need for additional gas supply devices, making it both economical and environmentally friendly.

[0017] In summary, the oil sealing structure of high-speed rotating parts under negative pressure of this invention solves the technical problem of lubricating oil leakage in high-speed rotating components in the prior art. The oil sealing structure of high-speed rotating parts under negative pressure of this invention can effectively prevent lubricating oil leakage, ensure the cleanliness of the working medium, and ensure normal production. At the same time, there is no wear, no maintenance costs, and it has superior economic and environmental performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the oil sealing structure of a high-speed rotating component under negative pressure environment according to this utility model.

[0019] In the diagram: 10, high-speed shaft; 20, bearing; 22, bearing housing; 24, bearing mounting cavity; 30, bearing cap; 32, lubricating oil inlet; 34, lubricating oil channel; 36, radial labyrinth groove; 38, first end face labyrinth structure; 39, bearing pressure ring; 40, high-speed labyrinth disc; 42, second end face labyrinth structure; 50, sealing ring; 60, fixing nut; 70, gas seal cover; 72, cover part; 720, gas seal cavity; 722, sealing gas inlet; 74, connecting part; 76, joint part; 760, positioning edge; 80, bolt. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] The directions mentioned in this manual are based on the directions shown in the attached diagram and represent only relative positional relationships, not absolute positional relationships.

[0022] like Figure 1 As shown, a bearing 20 is installed between the high-speed shaft 10 and the bearing housing 22. The oil sealing structure of a high-speed rotating component under negative pressure environment of this utility model includes a high-speed labyrinth disk 40 fixedly mounted on the high-speed shaft 10. A bearing cover 30 is mounted on the outer periphery of the high-speed labyrinth disk 40. Both the high-speed labyrinth disk 40 and the bearing cover 30 are located outside the bearing 20. In this embodiment, it is defined that: in the axial direction, the side closer to the end of the high-speed shaft 10 is the outside, and the opposite side is the inside; in the radial direction, the side closer to the high-speed shaft 10 is the inside, and the opposite side is the outside. In this preferred embodiment, the high-speed labyrinth disk 40 includes a central portion sleeved on the high-speed shaft 10 and an outer edge portion extending radially outward from the central portion. In the radial direction, the bearing cap 30 is sleeved on the outside of the central portion of the high-speed labyrinth disk 40, and in the axial direction, the outer edge portion of the high-speed labyrinth disk 40 is fastened to the outside of the bearing cap 30. In the radial direction, the size of the outer edge portion is smaller than the size of the bearing cap 30. Therefore, the high-speed labyrinth disk 40 and the bearing cap 30 have contact portions in both the radial and axial directions. In this embodiment, the contact portion between the bearing cap 30 and the high-speed labyrinth disk 40 is provided with a labyrinth structure.

[0023] like Figure 1As shown, a gas-tight cover 70 is fitted onto the high-speed shaft 10 located outside the high-speed labyrinth disk 40, enclosing the high-speed labyrinth disk 40. The gas-tight cover 70 includes a cover portion 72 fitted onto the high-speed shaft 10, and a connecting portion 76 fitted onto the outer edge of the high-speed labyrinth disk 40 and fitting against the outer end face of the bearing cover 30. The cover portion 72 and the connecting portion 76 are connected as one unit by a connecting portion 74, and the connecting portion 76 is fixedly connected to the bearing cover 30 by bolts 80. The edge of the connecting portion 76 protrudes beyond the outer edge of the bearing cover 30 and has an annular positioning edge 760 protruding towards the bearing cover 30. The bearing cover 30 is fitted into the positioning edge 760. The inner surface of the gas seal cover 70 that contacts the high-speed shaft 10 is provided with a radially recessed annular groove. The annular groove and the high-speed shaft 10 form a gas seal cavity 720. That is, the cover part 72 is a hollow structure. When it is fitted onto the high-speed shaft 10, its hollow inner cavity forms a gas seal cavity 720. There is a 0.5mm gap between the inner wall of the gas seal cavity 720 and the high-speed shaft 10, and a 0.1 to 0.2mm gap between the outer wall of the gas seal cavity 720 and the high-speed shaft 10. The side of the cover 72 is provided with a sealing gas inlet 722 that extends radially and communicates with the gas sealing cavity 720. Positive pressure sealing gas enters the gas sealing cavity 720 through the sealing gas inlet 722 and enters the gap of the labyrinth structure through the gap between the inner wall of the gas sealing cavity 720 and the high-speed shaft 10. Thus, the gap of the labyrinth structure forms a positive pressure gas seal between the gas sealing cover 70 and the high-speed shaft 10, which can effectively prevent lubricating oil from leaking under negative pressure.

[0024] like Figure 1 As shown, an annular mounting groove is provided on the end face of the joint 76 that fits with the bearing cover 30. A sealing ring 50 is installed in the mounting groove. In this embodiment, the sealing ring 50 is preferably an O-ring. The sealing ring 50 can prevent lubricating oil from leaking between the gas seal cover 70 and the bearing cover 30.

[0025] like Figure 1As shown, a fixing nut 60 is threadedly connected to the high-speed shaft 10 located between the high-speed labyrinth disk 40 and the cover portion 72. The center of the high-speed labyrinth disk 40 fixes the inner ring of the bearing 20 between itself and the stepped surface of the high-speed shaft 10. The fixing nut 60 is used to prevent the high-speed labyrinth disk 40 from slipping outward during high-speed rotation. Therefore, the fixing nut 60 fixes the inner ring of the bearing 20 and the high-speed labyrinth disk 40 to the high-speed shaft 10. A raised annular bearing pressure ring 39 is provided in the middle of the inner end face of the bearing cover 30. The bearing cover 30 located outside the bearing pressure ring 39 overlaps the end face of the bearing seat 22. The bearing pressure ring 39 extends into the inner side of the bearing seat 22 and fixes the outer ring of the bearing 20 between itself and the stepped surface of the bearing seat 22. The bearing cover 30 located inside the bearing pressure ring 39, together with the bearing seat 22, the high-speed shaft 10 and the high-speed labyrinth disk 40, constitutes the bearing mounting cavity 24. The bearing 20 is installed in the bearing mounting cavity 24.

[0026] like Figure 1 As shown, a lubricating oil inlet 32 ​​is provided on the outer side of the bearing cover 30, and a lubricating oil channel 34 is provided inside the bearing cover 30 to connect the lubricating oil inlet 32 ​​with the bearing mounting cavity 24. The bearing lubricating oil is pressed into the bearing mounting cavity 24 through the lubricating oil inlet 32 ​​and the lubricating oil channel 34 to lubricate the bearing 20 and extend the service life of the bearing 20.

[0027] like Figure 1 As shown, the labyrinth structure includes a radial labyrinth structure and an end-face labyrinth structure. The radial labyrinth structure includes a radial labyrinth groove 36 disposed on the inner side of the bearing cap 30. In this embodiment, the radial labyrinth groove 36 is an annular groove formed by a radial recess on the inner side of the bearing cap 30. Multiple radial labyrinth grooves 36 are provided along the axial direction. In this embodiment, two radial labyrinth grooves 36 are preferably provided. When the bearing cap 30 and the high-speed labyrinth disk 40 are fitted together, the radial labyrinth grooves 36 form a radial labyrinth gap between the bearing cap 30 and the high-speed labyrinth disk 40. The end-face labyrinth structure includes a first end-face labyrinth structure 38 disposed on the outer end face of the bearing cap 30 and a second end-face labyrinth structure 42 disposed on the inner end face of the high-speed labyrinth disk 40. The first end-face labyrinth structure 38 and the second end-face labyrinth structure 42 are both compatible interlocking structures. When the bearing cap 30 and the high-speed labyrinth disk 40 are combined, the first end-face labyrinth structure 38 and the second end-face labyrinth structure 42 are cross-engaged, and an end-face labyrinth gap is formed between the first end-face labyrinth structure 38 and the second end-face labyrinth structure 42.

[0028] like Figure 1 As shown, the working principle of the oil sealing structure for high-speed rotating parts under negative pressure environment of this utility model is as follows:

[0029] Driven by a power source, the high-speed shaft 10 rotates the inner ring of the bearing 20, the high-speed labyrinth disk 40, and the fixing nut 60 at high speed. The pressed sealing gas forms a positive pressure dynamic seal on the rotating high-speed shaft 10 within the gas-sealing cavity 720. Positive pressure dynamic seals are also formed in the radial labyrinth gap and the end face labyrinth gap between the high-speed labyrinth disk 40 and the bearing cover 30, and the pressure can be adjusted according to the negative pressure. At the same time, the sealing ring 50 installed between the gas-sealing cover 70 and the bearing cover 30 provides a static seal. This dynamic and static combination sealing method, which combines a labyrinth structure positive pressure gas seal with a sealing ring static seal, effectively prevents lubricating oil leakage. Moreover, the gaps between each component are filled with positive pressure gas, preventing contact wear between components and saving the cost of periodically replacing parts. It is also clean, pollution-free, and the gas source is inexpensive, eliminating the need for additional gas supply devices. While ensuring the cleanliness of the working medium and normal production, it also boasts superior economic and environmental benefits.

[0030] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. An oil-sealing structure for high-speed rotating parts under negative pressure, characterized in that, The device includes a high-speed labyrinth disk (40) fixedly mounted on a high-speed shaft (10). A bearing cap (30) is fitted around the outer periphery of the high-speed labyrinth disk (40). The bearing cap (30) has a labyrinth structure at the part that contacts the high-speed labyrinth disk (40). Both the bearing cap (30) and the high-speed labyrinth disk (40) are located outside the bearing (20). An airtight cover (70) that can enclose the high-speed labyrinth disk (40) is fitted on the high-speed shaft (10) located outside the high-speed labyrinth disk (40). A radially recessed annular groove is provided on the inner side of the airtight cover (70) that contacts the high-speed shaft (10). An airtight cavity (720) is formed between the annular groove and the high-speed shaft (10). A sealing gas inlet (722) that communicates with the airtight cavity (720) is provided on the airtight cover (70).

2. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 1, characterized in that, The maze structure includes a radial maze structure and an end-face maze structure.

3. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 2, characterized in that, The radial labyrinth structure includes an annular radial labyrinth groove (36) that is radially recessed from the inner side of the bearing cap (30). Multiple radial labyrinth grooves (36) are provided, and a radial labyrinth gap is formed between the radial labyrinth groove (36) and the outer side of the high-speed labyrinth disk (40).

4. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 3, characterized in that, The end-face labyrinth structure includes a first end-face labyrinth structure (38) disposed on the outer end face of the bearing cap (30) and a second end-face labyrinth structure (42) disposed on the inner end face of the high-speed labyrinth disk (40). The first end-face labyrinth structure (38) and the second end-face labyrinth structure (42) are cross-engaged, and an end-face labyrinth gap is formed between the first end-face labyrinth structure (38) and the second end-face labyrinth structure (42).

5. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 4, characterized in that, The gas seal cover (70) includes a cover portion (72) fitted on the high-speed shaft (10) and a connecting portion (76) fitted on the outside of the high-speed labyrinth disk (40) and in contact with the bearing cover (30). The cover portion (72) and the connecting portion (76) are connected as one unit by a connecting portion (74). The gas seal cavity (720) and the sealing gas inlet (722) are both provided on the cover portion (72).

6. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 5, characterized in that, The joint (76) is fixedly connected to the bearing cap (30) by bolts (80).

7. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 5, characterized in that, The end face of the joint (76) that is in contact with the bearing cap (30) is provided with an annular mounting groove, and a sealing ring (50) is installed in the mounting groove.

8. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 5, characterized in that, The edge of the joint (76) protrudes from the outer edge of the bearing cover (30) and has an annular positioning edge (760) that protrudes toward the bearing cover (30) to hold the bearing cover (30) in place.

9. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 5, characterized in that, The high-speed shaft (10) located between the high-speed labyrinth disk (40) and the cover portion (72) is threaded with a fixing nut (60).

10. The oil sealing structure for a high-speed rotating component under negative pressure environment according to claim 1, characterized in that, The bearing cap (30) has a raised bearing ring (39) at the center of its inner end face. The outer ring of the bearing (20) is fixed between the bearing ring (39) and the stepped surface of the bearing seat (22). The inner ring of the bearing (20) is fixed between the high-speed labyrinth disk (40) and the stepped surface of the high-speed shaft (10). The outer side of the bearing cap (30) has a lubricating oil inlet (32). The interior of the bearing cap (30) has a lubricating oil channel (34) that connects the lubricating oil inlet (32) and the bearing mounting cavity (24).

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