A labyrinth seal structure

Abstract

The utility model discloses a labyrinth seal structure, it includes the bearing seat fixed in the box body opening edge, the bearing of coaxial heart fixed in bearing seat, bearing fixed in the gear shaft of box body matching, gear shaft sleeve is equipped with the oil baffle, and there is a gap between oil baffle and gear shaft, gear shaft still is fixed with the seal strip base, and the end cover is sleeved in seal strip base, and the end cover is fixedly installed in the box body, and there is a gap between end cover and seal strip base, the oil baffle is clamped and fixed between bearing seat and end cover, and the end cover is equipped with first oil throwing ring groove, the seal ring groove is seted up in seal strip base, and the seal strip is placed in seal ring groove, and the seal strip is in contact with the inner circular surface of end cover, the utility model discloses can improve the sealing effect, reduce the leakage rate, solve the problem that the labyrinth seal is vulnerable to the invasion of external dust, moisture and the oil mist in the gear box under high temperature and high pressure seeps out through the labyrinth seal, and simultaneously, also can reduce the machining difficulty of rotating part and fixed part in the labyrinth seal device.

Description

Technical Field

[0001] This utility model relates to the technical field of gearbox sealing, and in particular to a labyrinth seal structure. Background Technology

[0002] To prevent external contamination, protect internal components, ensure lubrication, and extend service life, labyrinth seals are typically installed between the gearbox housing and the gear shaft. As a non-contact sealing method, labyrinth seals are widely used in rotating machinery due to their simple structure, strong adaptability, and convenient maintenance.

[0003] However, traditional labyrinth seals still suffer from problems such as large leakage and unstable sealing performance in practical applications, especially under harsh working conditions such as high speed, high temperature, and high pressure, where their performance often fails to meet requirements. Furthermore, the sealing cavity between the rotating and stationary components in a labyrinth seal is extremely small; insufficient machining and assembly precision can easily lead to collisions and scratches, affecting product performance. Simultaneously, the sealing cavity is directly exposed to the outside environment, allowing dust, moisture, and other contaminants to directly penetrate the gearbox, impacting the lifespan of bearings and gears. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a labyrinth seal structure that can optimize the sealing structure, improve the sealing effect and reduce the leakage rate; at the same time, it solves the problems of labyrinth seals being susceptible to the intrusion of external dust and moisture, as well as the leakage of oil mist inside the gearbox under high temperature and high pressure through the labyrinth seal; at the same time, it can also reduce the processing difficulty of the rotating part and the fixed part in the labyrinth seal device.

[0005] To solve the above-mentioned technical problems, the labyrinth sealing structure provided by this utility model adopts the following technical solution: A labyrinth sealing structure includes a bearing housing fixed to the edge of a housing opening, a bearing coaxially fixed to the inner circular surface of the bearing housing, the bearing fixed to a gear shaft fitted to the housing, an oil baffle ring fitted onto the gear shaft with a gap between the inner circular surface of the oil baffle ring and the gear shaft, a sealing strip base fitted and fixed onto the gear shaft, an end cap fitted onto the sealing strip base, the end cap fixedly installed in the housing with a gap between the inner circular surface of the end cap and the sealing strip base; the oil baffle ring is clamped and fixed between the bearing housing and the end cap, a first oil-slinging ring groove is formed on the inner circular surface of the end cap; a sealing ring groove is formed on the outer circular surface of the sealing strip base, a sealing strip is placed inside the sealing ring groove, and the sealing strip abuts against the inner circular surface of the end cap.

[0006] By adopting the above technical solution, the oil-slinging labyrinth sealing cavity formed by the gap between the oil baffle ring and the gear shaft, the gap between the end cover and the sealing strip base, and the first oil-slinging ring groove can effectively improve the sealing effect, thereby solving the problem that oil mist inside the gearbox may leak out through the labyrinth seal under high temperature and high pressure. Simultaneously, when the gear shaft rotates at low speed, the sealing strip rotates with the sealing strip base due to elastic tension, and because the sealing strip rotates in contact with the end cover, the sealing effect is guaranteed. The sealing strip can prevent the leakage of oil mist inside the gearbox and prevent contamination by moisture and dust outside the gearbox. When the gear shaft rotates at high speed, the sealing strip moves away from the sealing strip base due to centrifugal force and does not rotate with the sealing strip base. At this time, a tiny gap exists between the sealing groove of the sealing strip and the sealing strip base, which can extend the life of the sealing strip. This gap can also serve as a new labyrinth seal, working together with the labyrinth seal formed by the oil baffle ring and the end cover to ensure the sealing effect. The labyrinth seal structure described above can improve the sealing effect while reducing the processing and assembly difficulty of the rotating and fixed parts in the labyrinth seal structure.

[0007] Optionally, the gear shaft sleeve is provided with an oil slinger ring, the oil slinger ring is interference-fitted with the gear shaft, the oil baffle ring is sleeved on the oil slinger ring, and there is a gap between the oil baffle ring and the oil slinger ring; the oil slinger ring has an annular groove, the bottom wall of the annular groove is coaxially fixed with a retaining ring, the end cover has an annular slot, the oil slinger ring and the end cover are inserted into each other, and there is a gap between the retaining ring and the inner wall of the annular slot.

[0008] By adopting the above technical solution, the gap between the oil slinger ring and the oil baffle ring, as well as the gap between the oil slinger ring and the end cap, can be used as a labyrinth seal. Working in combination with the aforementioned labyrinth seal, it further prevents the leakage of internal oil mist and the contamination of external moisture and dust, thereby further improving the sealing effect.

[0009] Optionally, the oil baffle ring is provided with a second oil slinger groove, which is connected to the gap between the oil baffle ring and the oil slinger ring.

[0010] By adopting the above technical solution, the gap between the second oil-slinging ring groove, the oil-blocking ring and the oil-slinging ring can serve as a labyrinth seal, working in conjunction with the aforementioned labyrinth seal to further prevent the leakage of internal oil mist and the contamination of external moisture and dust.

[0011] Optionally, there are two sealing ring grooves, which are respectively located at both ends of the sealing strip base along its axis. A sealing strip is placed in each of the two sealing ring grooves. A pressure plate is fixedly installed at the end of the sealing strip base away from the oil slinger ring. One of the sealing strips abuts against the oil slinger ring, and the other sealing strip abuts against the pressure plate.

[0012] By adopting the above technical solution, the pressure plate enables the outer sealing strip to be stably placed in the sealing ring groove and to stably abut against the inner circular surface of the end cover. The sealing strip abutting against the oil slinger ring can better prevent the leakage of oil stains inside the box, while the sealing strip abutting against the pressure plate can prevent the contamination of moisture and dust outside the box.

[0013] Optionally, the cross-sectional profile of the pressure plate is stepped, the large end of the pressure plate abuts against the sealing strip, and there is a gap between the small end of the pressure plate and the end cap.

[0014] By adopting the above technical solution, the pressure plate is stably pressed onto the sealing strip while also creating a gap between the pressure plate and the end cap. This gap can also function as a labyrinth seal, working in conjunction with other labyrinth seals to more effectively prevent contamination from external moisture and dust.

[0015] Optionally, the pressure plate is fixedly installed to the sealing strip base by screws.

[0016] Optionally, the groove width at the outer diameter of the sealing ring groove is greater than the groove width at the inner diameter.

[0017] By adopting the above technical solution, the sealing strip can move more smoothly away from the sealing strip base when the gear shaft rotates at high speed.

[0018] Optionally, the sealing strip is made of a wear-resistant and high-temperature-resistant material.

[0019] By adopting the above technical solutions, the labyrinth sealing structure can ensure excellent sealing performance under high temperature and high pressure.

[0020] In summary, this utility model has at least one of the following beneficial technical effects: 1. The oil-slinging labyrinth seal cavity formed by the gap between the oil baffle ring and the gear shaft, the gap between the end cover and the sealing strip base, and the first oil-slinging ring groove can effectively improve the sealing effect, thereby solving the problem that oil mist inside the gearbox may leak out through the labyrinth seal under high temperature and high pressure. The gap between the oil-slinging ring and the oil baffle ring, as well as the gap between the oil-slinging ring and the end cover, can serve as labyrinth seals, working in combination with the aforementioned labyrinth seals to further prevent the leakage of internal oil mist and the contamination of external moisture and dust, further improving the sealing effect. The gap between the second oil-slinging ring groove, the oil baffle ring, and the oil-slinging ring can serve as labyrinth seals, working in conjunction with the aforementioned labyrinth seals to further prevent the leakage of internal oil mist and the contamination of external moisture and dust. 2. When the gear shaft rotates at low speed, the sealing strip rotates with the sealing strip base due to elastic tension. Simultaneously, the sealing strip rotates in contact with the end cap, ensuring a sealing effect. The sealing strip prevents oil mist leakage inside the housing and prevents moisture and dust contamination from the outside. When the gear shaft rotates at high speed, the sealing strip moves away from the sealing strip base due to centrifugal force and no longer rotates with it. At this time, a tiny gap exists between the sealing groove of the sealing strip and the sealing strip base. This not only extends the life of the sealing strip but also serves as a new labyrinth seal, working in conjunction with the labyrinth seal formed by the oil baffle ring and the end cap, maintaining the same sealing effect. This labyrinth seal structure improves the sealing effect while reducing the machining and assembly difficulty of the rotating and stationary components in the labyrinth seal structure. 3. The gap formed between the pressure plate and the end cap can also serve as a labyrinth seal. Working together with other labyrinth seals, it can more effectively prevent the contamination of the outside of the box by moisture and dust. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention used to demonstrate the sealing structure of a maze.

[0022] Figure 2 This is an enlarged structural schematic diagram of the labyrinth seal in this utility model.

[0023] Figure 3 This is an enlarged structural schematic diagram of the sealing ring groove and sealing strip in this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Bearing seat; 3. Oil retainer ring; 31. Second oil slinger ring groove; 4. Bearing; 5. Gear shaft; 6. Labyrinth seal; 61. Oil slinger ring; 611. Annular groove; 612. Retaining ring; 62. End cap; 621. First oil slinger ring groove; 622. Annular slot; 63. Sealing strip base; 64. Pressure plate; 65. Sealing strip; 66. Screw; 67. Washer. Detailed Implementation

[0025] The following is in conjunction with the appendix Figure 1-3 The present invention will be described in further detail below.

[0026] This utility model discloses a labyrinth sealing structure. (Refer to...) Figure 1 The labyrinth sealing structure includes a housing 1, a gear shaft 5, a bearing housing 2, and a bearing 4. The bearing housing 2 is fixedly installed on the edge of the opening of the housing 1, and the bearing housing 2 is arranged on the same central axis as the opening of the housing 1. The bearing 4 is coaxially arranged at the opening of the housing 1, and the outer ring of the bearing 4 is fixedly connected to the inner circular surface of the bearing housing 2. The gear shaft 5 passes through the bearing 4, and the gear shaft 5 and the inner ring of the bearing 4 are interference-fitted.

[0027] Reference Figure 1 and Figure 2 The gear shaft 5 is fitted with an oil slinger ring 61 and a sealing strip base 63. Both the oil slinger ring 61 and the sealing strip base 63 are interference-fitted with the gear shaft 5. The sealing strip base 63 is located on the side of the oil slinger ring 61 away from the gear shaft 5. An oil baffle ring 3 is fitted over the oil slinger ring 61, and an end cap 62 is fitted over the sealing strip base 63. The end cap 62 is fixedly installed in the housing 1, and the oil baffle ring 3 is clamped and fixed between the bearing seat 2 and the end cap 62. There is a gap between the inner surface of the end cap 62 and the outer surface of the sealing strip base 63, and there is a gap between the inner surface of the oil baffle ring 3 and the outer surface of the oil slinger ring 61. The oil slinger ring 61, the end cap 62, the sealing strip base 63, the sealing strip 65, and the pressure plate 64 together form the labyrinth seal 6.

[0028] Reference Figure 1 and Figure 2 The inner circular surface of the end cap 62 is provided with a first oil-slinging ring groove 621, and the opening direction of the first oil-slinging ring groove 621 is perpendicular to the axis of the end cap 62. The oil-blocking ring 3 is provided with a second oil-slinging ring groove 31, which is connected to the gap between the oil-blocking ring 3 and the oil-slinging ring 61, that is, connected to the first oil-slinging ring groove 621.

[0029] Reference Figure 1 and Figure 2 The oil slinger ring 61 has an L-shaped cross-sectional profile. An oil retainer ring 3 is fitted onto one end face of the oil slinger ring 61. An annular groove 611 is formed on the other end face of the oil slinger ring 61. A retainer ring 612 is coaxially fixedly connected to the bottom wall of the annular groove 611. An annular slot 622 is formed on the end cap 62. The annular slot 622 is coaxially arranged with the end cap 62. The retainer ring 612 is inserted into the annular slot 622. The end cap 62 and the oil slinger ring 61 are engaged. A gap exists between the retainer ring 612 and the inner wall of the annular slot 622.

[0030] Reference Figure 1 and Figure 2 The outer circumference of the sealing strip base 63 has two sealing ring grooves, both of which are coaxial with the sealing strip base 63 and located at opposite ends of its axis. A sealing strip 65 is placed within each of the two sealing ring grooves, and both sealing strips 65 abut against the inner circumference of the end cap 62. The sealing strips 65 are made of wear-resistant and high-temperature-resistant material, ensuring excellent sealing performance of the labyrinth seal structure under high temperature and pressure.

[0031] Reference Figure 1 and Figure 2The end of the sealing strip base 63 furthest from the oil slinger ring 61 is fixedly connected to a pressure plate 64 by a screw 66. A washer 67 is provided between the screw head 66 and the pressure plate 64, allowing the pressure plate 64 to be more stably fixed to the sealing strip base 63. The cross-sectional profile of the pressure plate 64 is stepped. The sealing strip 65 furthest from the oil slinger ring 61 abuts against the large end of the pressure plate 64, and there is a gap between the small end of the pressure plate 64 and the end cap 62. The pressure plate 64 allows the outer sealing strip 65 to be stably placed in the sealing ring groove and stably abut against the inner circular surface of the end cap 62. The sealing strip 65 abutting against the oil slinger ring 61 can better prevent the leakage of oil stains inside the housing 1, and the sealing strip 65 abutting against the pressure plate 64 can prevent the contamination of moisture and dust outside the housing 1.

[0032] The gap between the oil baffle ring 3 and the gear shaft 5, the gap between the end cover 62 and the sealing strip base 63, and the oil-throwing labyrinth sealing cavity formed by the first oil-throwing ring groove 621 can effectively improve the sealing effect, thereby solving the problem that oil mist inside the gearbox may leak out through the labyrinth seal under high temperature and high pressure.

[0033] When the gear shaft 5 rotates at low speed, the sealing strip 65 rotates with the sealing strip base 63 due to elastic tension. Simultaneously, because the sealing strip 65 rotates in contact with the end cover 62, a sealing effect is ensured. The sealing strip 65 abutting against the oil slinger ring 61 can better prevent oil leakage from inside the housing 1, while the sealing strip 65 abutting against the pressure plate 64 can prevent contamination from external moisture and dust. Furthermore, to ensure that the sealing strip 65 can more easily move away from the sealing strip base 63 when the gear shaft 5 rotates at high speed, refer to... Figure 3 The groove width at the outer diameter of the sealing ring groove is greater than the groove width at the inner diameter.

[0034] When the gear shaft 5 rotates at high speed, the sealing strip 65 moves away from the sealing strip base 63 due to centrifugal force and does not rotate with the sealing strip base 63. At this time, a tiny gap exists between the sealing strip 65 and the sealing groove of the sealing strip base 63. This not only extends the life of the sealing strip 65, but also allows this gap to act as a new labyrinth seal, working together with the labyrinth seal formed by the oil baffle ring 3 and the end cap 62 to ensure the same sealing effect. The labyrinth seal structure described above can improve the sealing effect while reducing the machining and assembly difficulty of the rotating and stationary parts in the labyrinth seal structure.

[0035] The gaps between the oil slinger ring 61 and the oil baffle ring 3, as well as the gaps between the oil slinger ring 61 and the end cap 62, can serve as labyrinth seals. Working in conjunction with the aforementioned labyrinth seals, they further prevent the leakage of internal oil mist and the contamination of external moisture and dust, thus further improving the sealing effect. The gaps between the second oil slinger ring groove 31, the oil baffle ring 3, and the oil slinger ring 61 can also serve as labyrinth seals, working in conjunction with the aforementioned labyrinth seals to further prevent the leakage of internal oil mist and the contamination of external moisture and dust. While the pressure plate 64 is stably pressed onto the sealing strip 65, a gap is formed between the pressure plate 64 and the end cap 62, which can also serve as a labyrinth seal. Working together with other labyrinth seals, it can more effectively prevent the contamination of the casing 1 by external moisture and dust.

[0036] The implementation principle of the labyrinth seal structure in this embodiment of the utility model is as follows: the gap between the oil-blocking ring 3 and the gear shaft 5, the gap between the end cover 62 and the sealing strip base 63, and the first oil-slinging ring groove 621 together form an oil-slinging labyrinth seal cavity, which can effectively improve the sealing effect, thereby solving the problem that oil mist inside the gearbox may leak out through the labyrinth seal under high temperature and high pressure. The gap between the oil-slinging ring 61 and the oil-blocking ring 3, and the gap between the oil-slinging ring 61 and the end cover 62 can serve as labyrinth seals, working in combination with the aforementioned labyrinth seals to further prevent the leakage of internal oil mist and the contamination of external moisture and dust, further improving the sealing effect. The gap between the second oil-slinging ring groove 31, the oil-blocking ring 3, and the oil-slinging ring 61 can also serve as labyrinth seals, working in conjunction with the aforementioned labyrinth seals to further prevent the leakage of internal oil mist and the contamination of external moisture and dust. While the pressure plate 64 is stably pressed onto the sealing strip 65, a gap is formed between the pressure plate 64 and the end cover 62, which can also serve as a labyrinth seal. Working together with other labyrinth seals, it can more effectively prevent the contamination of the box 1 by external moisture and dust.

[0037] When the gear shaft 5 rotates at low speed, the sealing strip 65 rotates with the sealing strip base 63 due to the elastic tension. Simultaneously, because the sealing strip 65 rotates in contact with the end cover 62, the sealing effect is ensured. The sealing strip 65 abutting against the oil slinger ring 61 can better prevent the leakage of oil stains inside the housing 1, while the sealing strip 65 abutting against the pressure plate 64 can prevent contamination from moisture and dust outside the housing 1. Furthermore, to allow the sealing strip 65 to move more smoothly away from the sealing strip base 63 when the gear shaft 5 rotates at high speed, the groove width at the outer diameter of the sealing ring groove is greater than the groove width at the inner diameter.

[0038] When the gear shaft 5 rotates at high speed, the sealing strip 65 moves away from the sealing strip base 63 due to centrifugal force and does not rotate with the sealing strip base 63. At this time, a tiny gap exists between the sealing strip 65 and the sealing groove of the sealing strip base 63. This not only extends the life of the sealing strip 65, but also allows this gap to act as a new labyrinth seal, working together with the labyrinth seal formed by the oil baffle ring 3 and the end cap 62 to ensure the same sealing effect. The labyrinth seal structure described above can improve the sealing effect while reducing the machining and assembly difficulty of the rotating and stationary parts in the labyrinth seal structure.

[0039] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A labyrinth seal structure, characterized by: The enclosure includes a bearing seat (2) fixed to the edge of the opening of the housing (1), and a bearing (4) coaxially fixed to the inner surface of the bearing seat (2). The bearing (4) is fixed to a gear shaft (5) that is matched with the housing (1). The gear shaft (5) is fitted with an oil baffle ring (3). There is a gap between the inner surface of the oil baffle ring (3) and the gear shaft (5). The gear shaft (5) is also fixed with a sealing strip base (63). The sealing strip base (63) is fitted with an end cap (62). The end cap (62) is... 2) Fixedly installed in the housing (1), there is a gap between the inner circular surface of the end cover (62) and the sealing strip base (63); the oil baffle ring (3) is clamped and fixed between the bearing seat (2) and the end cover (62), the inner circular surface of the end cover (62) is provided with a first oil slinger groove (621); the outer circular surface of the sealing strip base (63) is provided with a sealing ring groove, and a sealing strip (65) is placed inside the sealing ring groove, the sealing strip (65) abuts against the inner circular surface of the end cover (62).

2. A labyrinth seal structure according to claim 1, characterised in that: The gear shaft (5) is fitted with an oil slinger ring (61), which is interference-fitted with the gear shaft (5). The oil baffle ring (3) is fitted on the oil slinger ring (61), and there is a gap between the oil baffle ring (3) and the oil slinger ring (61). The oil slinger ring (61) has an annular groove (611), and a retaining ring (612) is fixed coaxially on the bottom wall of the annular groove (611). The end cap (62) has an annular slot (622), and the oil slinger ring (61) and the end cap (62) are inserted into each other. There is a gap between the retaining ring (612) and the inner wall of the annular slot (622).

3. A labyrinth seal structure according to claim 2, wherein: The oil baffle ring (3) has a second oil slinger groove (31), which is connected to the gap between the oil baffle ring (3) and the oil slinger ring (61).

4. A labyrinth seal structure according to claim 2, wherein: There are two sealing ring grooves, which are respectively located at both ends of the sealing strip base (63) along its axis. A sealing strip (65) is placed in each of the two sealing ring grooves. A pressure plate (64) is fixedly installed at the end of the sealing strip base (63) away from the oil slinger ring (61). One of the sealing strips (65) abuts against the oil slinger ring (61), and the other sealing strip (65) abuts against the pressure plate (64).

5. A labyrinth seal according to claim 4, wherein: The cross-sectional profile of the pressure plate (64) is stepped. The large end of the pressure plate (64) abuts against the sealing strip (65), and there is a gap between the small end of the pressure plate (64) and the end cap (62).

6. A labyrinth seal according to claim 5, wherein: The pressure plate (64) is fixedly installed on the sealing strip base (63) by screws (66).

7. A labyrinth seal structure according to claim 1, wherein: The groove width at the outer diameter of the sealing ring groove is greater than the groove width at the inner diameter.

8. A labyrinth seal structure according to claim 1, wherein: The sealing strip (65) is made of wear-resistant and high-temperature resistant material.

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