Sealing device of high-speed gearbox

Abstract

A sealing device of a high-speed gear box comprises a static ring and a movable ring. The static ring is detachably connected with a box body of the high-speed gear box, a rotating shaft of the high-speed gear box is movably sleeved with the static ring, a first gap exists between the static ring and the rotating shaft, an oil guide ring groove communicated with the first gap is formed in the inner wall of the static ring, and the oil guide ring groove is communicated with the box body through a plurality of first oil return channels; a containing ring groove is formed in the inner wall of the movable ring, and a sealing wear-resisting rubber ring making contact with the outer wall of the rotating shaft is fixedly arranged in the containing ring groove. A part of an oil-gas mixture in the high-speed gear box can be blocked by the end face of the static ring, the other part of the oil-gas mixture can enter the first gap and then enter the second gap, and the oil-gas mixture entering the second gap can be blocked by the sealing wear-resistant rubber ring and cannot continuously flow out along the second gap. The blocked oil-gas mixture can enter the first oil return channel along the oil guide ring groove and then enter the box body through the first oil return channel, so that the sealing performance of the high-speed gear box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed gearbox sealing, and specifically relates to a sealing device for a high-speed gearbox. Background Art

[0002] With the development and progress of society, the demand for energy by humans is increasing day by day, and the development of the industrial technology system is getting faster and faster. High-speed gearboxes have been widely used in industry. Due to the high rotational speed of high-speed gearboxes, if conventional contact sealing devices are used, the sealing devices will be quickly worn. Therefore, at present, non-contact labyrinth sealing structures are generally used for sealing high-speed gearboxes. However, the rotational speed of the rotating shaft of the high-speed gearbox is high, and the linear speed of the gears is relatively high, which stirs the lubricating oil in the gearbox to splash inside the box, forming an oil-gas mixture that fills the box. The oil-gas mixture causes local high and low pressures inside the gearbox, and then leads to unstable and unbalanced internal and external pressure differences when the non-contact labyrinth sealing structure is used for sealing the high-speed gearbox, and oil leakage and oil leakage will occur at the sealing part, especially leakage at the rotating shaft of the high-speed gearbox, which seriously affects the safe use of the high-speed gearbox. Content of the Utility Model

[0003] In order to solve the problem that oil leakage and oil leakage occur at the sealing part when the existing technology uses a non-contact labyrinth sealing structure for sealing a high-speed gearbox, the utility model provides a sealing device for a high-speed gearbox, which improves the sealing performance of the high-speed gearbox.

[0004] The technical solution adopted by the utility model to solve the above technical problems is: a sealing device for a high-speed gearbox, including a stationary ring and a rotating ring;

[0005] The stationary ring is detachably connected to the box body of the high-speed gearbox. The stationary ring is movably sleeved on the rotating shaft of the high-speed gearbox, and there is a first gap between the stationary ring and the rotating shaft. An oil guiding ring groove communicated with the first gap is arranged on the inner wall of the stationary ring, and the oil guiding ring groove is communicated with the box body through a plurality of first oil return channels. A first annular retaining block is also arranged on the stationary ring, and a distance is left between the first annular retaining block and the stationary ring to form a follow-up limiting space;

[0006] The rotating ring is movably sleeved on the part of the rotating shaft extending out of the stationary ring, and there is a second gap between the rotating ring and the rotating shaft. The second gap is communicated with the first gap. An accommodating ring groove is arranged on the inner wall of the rotating ring, and a sealing wear-resistant rubber ring in contact with the outer wall of the rotating shaft is fixedly arranged in the accommodating ring groove. The rotating ring is also fixedly connected with a second annular retaining block, and the second annular retaining block extends into the follow-up limiting space.

[0007] As a further optimization of the sealing device of a high-speed gearbox of the utility model: there is a third gap between the static ring and the dynamic ring, and a second oil return channel facing the dynamic ring is arranged on the static ring, and the second oil return channel is communicated with both the third gap and the oil guiding ring groove.

[0008] As a further optimization of the sealing device of a high-speed gearbox of the utility model: a sealing and wear-resistant ring is also arranged between the static ring and the dynamic ring, and the sealing and wear-resistant ring is used to intercept the oil body flowing into the third gap from the first gap and the second gap into the second oil return channel.

[0009] As a further optimization of the sealing device of a high-speed gearbox of the utility model: an extension ring is fixedly connected to the static ring, the extension ring is fixedly connected to the first annular retaining part, and the ring width of the extension ring is smaller than the ring width of the first annular retaining part.

[0010] As a further optimization of the sealing device of a high-speed gearbox of the utility model: a retaining ring is arranged on the dynamic ring, and the first annular retaining part is in contact with the inner wall of the retaining ring.

[0011] As a further optimization of the sealing device of a high-speed gearbox of the utility model: a contact part in contact with the box body is arranged on the static ring, an annular groove is opened on the contact part, and a sealing and wear-resistant washer in contact with the surface of the box body is arranged in the annular groove.

[0012] As a further optimization of the sealing device of a high-speed gearbox of the utility model: the first gap is 0.2 - 0.4 mm.

[0013] As a further optimization of the sealing device of a high-speed gearbox of the utility model: the second gap is 0.2 - 0.4 mm.

[0014] As a further optimization of the sealing device of a high-speed gearbox of the utility model: the static ring is connected to the box body by bolts.

[0015] Beneficial effects: The first gap of the static ring is communicated with the second gap of the dynamic ring. An oil guiding ring groove communicated with the first gap is arranged on the inner wall of the static ring, and the oil guiding ring groove is communicated with the box body through a plurality of first oil return channels; an accommodating ring groove is arranged on the inner wall of the dynamic ring, and a sealing and wear-resistant rubber ring in contact with the outer wall of the rotating shaft is fixedly arranged in the accommodating ring groove. A part of the oil and gas mixture splashing everywhere in the high-speed gearbox will be blocked by the end face of the static ring, and the other part of the oil and gas mixture will enter the first gap, and then enter the second gap. The oil and gas mixture entering the second gap will be blocked by the sealing and wear-resistant rubber ring and will not continue to flow out along the second gap. The blocked oil and gas mixture will enter the first oil return channel along the oil guiding ring groove, and then enter the box body through the first oil return channel, improving the sealing performance of the high-speed gearbox.

[0016] The inner wall of the sealed wear-resistant rubber ring is in contact with the rotating shaft. As the rotating shaft rotates, the sealed wear-resistant rubber ring will slide relative to the rotating shaft, and the sealed wear-resistant rubber ring also enables the moving ring to rotate to a certain extent following the rotation of the rotating shaft. Therefore, there will be a certain rotational speed difference between the moving ring and the rotating shaft, and the rotational speed of the moving ring is lower than that of the rotating shaft. Compared with a simple contact seal, the present utility model reduces the relative sliding speed between the rotating shaft and the contact seal and improves the service life of the sealed wear-resistant rubber ring; compared with a simple non-contact seal, the contact seal of the present utility model has better sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is a partially enlarged view of the present utility model;

[0019] Reference numerals in the drawings: 1, stationary ring; 101, oil guiding ring groove; 102, first oil return passage; 103, second oil return passage; 104, extension ring; 105, first annular retaining portion; 106, contact portion; 107, sealed wear-resistant washer; 2, moving ring; 201, second annular retaining portion; 202, retaining ring; 3, sealed wear-resistant rubber ring; 4, sealed wear-resistant ring; 5, bolt; 6, housing; 7, rotating shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solution of the present utility model will be further elaborated in detail below in conjunction with specific embodiments. For parts that are not detailedly described and disclosed in the following embodiments of the present utility model, they should all be understood as the prior art known or should be known to those skilled in the art, such as the specific structure of a high-speed gearbox, the materials of the stationary ring 1 and the moving ring 2, etc.

[0021] Embodiment 1

[0022] A sealing device for a high-speed gearbox, as Figure 1 and Figure 2As shown in the figure, it includes a stationary ring 1 and a rotating ring 2. The stationary ring 1 is detachably connected to the housing 6 of the high-speed gearbox, and the stationary ring 1 is connected to the housing 6 by bolts 5. The stationary ring 1 is movably sleeved on the rotating shaft 7 of the high-speed gearbox, and there is a first gap between the stationary ring 1 and the rotating shaft 7. The first gap is 0.2 - 0.4 mm. An oil guiding ring groove 101 communicating with the first gap is arranged on the inner wall of the stationary ring 1, and the oil guiding ring groove 101 communicates with the housing 6 through a plurality of first oil return channels 102. A first annular stop 105 is also arranged on the stationary ring 1, and a distance is left between the first annular stop 105 and the stationary ring 1 to form a follow-up limiting space. The rotating ring 2 is movably sleeved on the part of the rotating shaft 7 extending out of the stationary ring 1, and there is a second gap between the rotating ring 2 and the rotating shaft 7. The second gap is 0.2 - 0.4 mm. The second gap communicates with the first gap. When the rotating shaft 7 of the high-speed gearbox rotates at a high speed, a part of the oil-gas mixture splashing everywhere in the high-speed gearbox will be blocked by the end face of the stationary ring 1, and another part of the oil-gas mixture will enter the first gap and then enter the second gap. An accommodation ring groove is arranged on the inner wall of the rotating ring 2, and a sealing and wear-resistant rubber ring 3 in contact with the outer wall of the rotating shaft 7 is fixedly arranged in the accommodation ring groove. The oil-gas mixture entering the second gap will be blocked by the sealing and wear-resistant rubber ring 3 and will not continue to flow out along the second gap. The blocked oil-gas mixture will enter the first oil return channel 102 along the oil guiding ring groove 101, and then enter the housing 6 through the first oil return channel 102; the sealing and wear-resistant rubber ring 3 has a certain elasticity and a smooth surface. The inner wall of the sealing and wear-resistant rubber ring 3 is in contact with the rotating shaft 7. As the rotating shaft 7 rotates, the sealing and wear-resistant rubber ring 3 will slide relative to the rotating shaft 7, and the sealing and wear-resistant rubber ring 3 also enables the rotating ring 2 to rotate to a certain extent following the rotation of the rotating shaft 7. Therefore, there will be a certain rotational speed difference between the rotating ring 2 and the rotating shaft 7, and the rotational speed of the rotating ring 2 is lower than that of the rotating shaft 7. Therefore, compared with a simple contact seal, the relative sliding speed between the rotating shaft 7 and the contact seal is reduced in the present utility model, and the service life of the sealing and wear-resistant rubber ring 3 is improved; compared with a simple non-contact seal, the sealing performance of the contact seal in the present utility model is better.

[0023] The rotating ring 2 is also fixedly connected with a second annular stop 201, and the second annular stop 201 extends into the follow-up limiting space. The assembly of the stationary ring 1 and the rotating ring 2 is carried out by heating the stationary ring 1 or freezing the rotating ring 2, that is, the first annular stop 105 extends into the follow-up limiting space. The cross-section of the end faces of the first annular stop 105 and the second annular stop 201 that cooperate with each other can be set as a trapezoid, and the hypotenuses of the two trapezoids close to each other are parallel. The specific method is the conventional prior art in this field and will not be elaborated too much here.

[0024] The above is the basic embodiment of the present utility model. Further improvements, optimizations and limitations can be made on this basis to obtain the following various embodiments:

[0025] Example 2

[0026] This embodiment is an improved solution based on Embodiment 1. Its main structure is the same as that of Embodiment 1. The improvement lies in that there is a third gap between the stationary ring 1 and the rotating ring 2. Part of the oil-gas mixture entering the first gap enters the second gap, and the other part enters the third gap. The oil-gas mixture in the second gap is blocked by the sealing and wear-resistant rubber ring 3, so that the oil-gas mixture in the second gap also enters the third gap. The stationary ring 1 is provided with a second oil return channel 103 facing the rotating ring 2. The second oil return channel 103 is connected to both the third gap and the oil guiding ring groove 101. The oil-gas mixture in the third gap enters the oil guiding ring groove 101 through the second oil return channel 103, and then enters the box body 6 through the first oil return channel 102. A sealing and wear-resistant ring 4 is also arranged between the stationary ring 1 and the rotating ring 2. The sealing and wear-resistant ring 4 is used to intercept the oil flowing from the first gap and the second gap into the third gap into the second oil return channel 103. A clamping groove will be formed between the stationary ring 1 and the rotating ring 2, and the sealing and wear-resistant ring 4 is installed in the clamping groove to prevent the end face of the rotating ring 2 from rubbing against the end face of the stationary ring 1 and causing damage.

[0027] Example 3

[0028] This embodiment is an improved solution based on Embodiment 1. Its main structure is the same as that of Embodiment 1. The improvement lies in that in order to reduce the friction between the first annular blocking portion 105 and the second annular blocking portion 201 when the rotating ring 2 rotates with the rotating shaft 7, an extension ring 104 is fixedly connected to the stationary ring 1. The extension ring 104 is fixedly connected to the first annular blocking portion 105, and the ring width of the extension ring 104 is smaller than the ring width of the first annular blocking portion 105. A retaining ring 202 is arranged on the rotating ring 2, and the inner wall of the retaining ring 202 is in contact with the first annular blocking portion 105. The thickness of the side of the first annular blocking portion 105 in contact with the retaining ring 202 is relatively large, and the thickness of the retaining ring 202 is also set to be relatively thick to ensure that the first annular blocking portion 105 and the retaining ring 202 will not be damaged quickly when rubbing against each other.

[0029] Example 4

[0030] This embodiment is an improved solution based on Embodiment 1. Its main structure is the same as that of Embodiment 1. The improvement lies in that the stationary ring 1 is provided with a contact portion 106 in contact with the box body 6. An annular groove is formed in the contact portion 106, and a sealing and wear-resistant washer 107 in contact with the surface of the box body 6 is arranged in the annular groove, further increasing the seal between the stationary ring 1 and the box body 6.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the embodiments shown herein, but rather should be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A sealing device for a high-speed gearbox, characterized in that: It includes a stationary ring (1) and a rotating ring (2). The stationary ring (1) is detachably connected to the housing (6) of the high-speed gearbox. The stationary ring (1) is movably sleeved on the rotating shaft (7) of the high-speed gearbox, and there is a first gap (701) between the stationary ring (1) and the rotating shaft (7). An oil guiding ring groove (101) communicating with the first gap (701) is arranged on the inner wall of the stationary ring (1), and the oil guiding ring groove (101) communicates with the housing (6) through a plurality of first oil return channels (102). A first annular stop (105) is also arranged on the stationary ring (1), and a distance is left between the first annular stop (105) and the stationary ring (1) to form a follow-up limiting space. The rotating ring (2) is movably sleeved on the part of the rotating shaft (7) extending out of the stationary ring (1), and there is a second gap (702) between the rotating ring (2) and the rotating shaft (7). The second gap (702) communicates with the first gap (701). A receiving ring groove is arranged on the inner wall of the rotating ring (2), and a sealing and wear-resistant rubber ring (3) in contact with the outer wall of the rotating shaft (7) is fixedly arranged in the receiving ring groove. The rotating ring (2) is also fixedly connected with a second annular stop (201), and the second annular stop (201) extends into the follow-up limiting space.

2. The sealing device of the high-speed gearbox according to claim 1, characterized in that: There is a third gap (8) between the stationary ring (1) and the rotating ring (2). A second oil return channel (103) facing the rotating ring (2) is arranged on the stationary ring (1), and the second oil return channel (103) communicates with both the third gap (8) and the oil guiding ring groove (101).

3. The sealing device of the high-speed gearbox according to claim 2, characterized in that: A sealing and wear-resistant ring (4) is also arranged between the stationary ring (1) and the rotating ring (2), and the sealing and wear-resistant ring (4) is used to intercept the oil flowing from the first gap (701) and the second gap (702) into the third gap (8) into the second oil return channel (103).

4. The sealing device of the high-speed gearbox according to claim 1, characterized in that: An extension ring (104) is fixedly connected to the stationary ring (1), the extension ring (104) is fixedly connected with the first annular stop (105), and the ring width of the extension ring (104) is smaller than the ring width of the first annular stop (105).

5. The sealing device of the high-speed gearbox according to claim 1, characterized in that: A stop ring (202) is arranged on the rotating ring (2), and the inner wall of the stop ring (202) is in contact with the first annular stop (105).

6. The sealing device of the high-speed gearbox according to claim 1, characterized in that: A contact part (106) in contact with the housing (6) is arranged on the stationary ring (1), an annular groove is formed in the contact part (106), and a sealing and wear-resistant washer (107) in contact with the surface of the housing (6) is arranged in the annular groove.

7. The sealing device of the high-speed gearbox according to claim 1, characterized in that: The first gap (701) is 0.2 - 0.4 mm.

8. The sealing device of the high-speed gearbox according to claim 1, characterized in that: The second gap (702) is 0.2 - 0.4 mm.

9. The sealing device of the high-speed gearbox according to claim 1, characterized in that: The stationary ring (1) is connected to the housing (6) by bolts (5).

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