Sealing Structure of Vertical Gearbox

Abstract

The present invention relates to the field of sealing technology, and particularly to a sealing structure for a vertical gearbox. The sealing structure of the vertical gearbox includes a through cover, a moving ring, and a stationary ring. The through cover is sleeved on the transmission shaft of the vertical gearbox and installed on the box body of the vertical gearbox. The inner side of the moving ring is interference-fitted on the transmission shaft, and a limiting groove is formed on the moving ring. One end of the stationary ring is connected to the through cover, and the other end passes through the limiting groove so that the moving ring, the stationary ring, and the through cover enclose an oil return cavity. A plurality of first tooth rings are arranged at intervals along the axial direction of the moving ring on the inner side wall of the limiting groove close to the oil return cavity, and a first labyrinth seal structure is formed by surrounding the outer side of the stationary ring and the plurality of first tooth rings. The first labyrinth seal structure forms multiple seals between the moving ring and the stationary ring, improves the sealing performance of the non-contact seal structure between the moving ring and the stationary ring, and improves the reliability of the sealing structure of the vertical gearbox.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing, and particularly to a sealing structure for a vertical gearbox. Background Art

[0002] The oil seal method of a vertical gearbox usually adopts a non-contact sealing structure, which has the advantages of high reliability and long service life.

[0003] Currently, the non-contact sealing structure adopts a method of matching a dynamic ring and a static ring. Since there is a tiny gap between the dynamic ring and the static ring, and the gap increases with the increase of the service time, it is easy to cause lubricating oil leakage. At the same time, when the transmission shaft of the vertical gearbox rotates at a high speed, an oil mist is easily generated on the outer peripheral surface of the dynamic ring due to the high-speed rotation, further increasing the leakage amount of the lubricating oil and reducing the reliability of the non-contact sealing structure.

[0004] Therefore, there is an urgent need for a sealing structure for a vertical gearbox to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing structure for a vertical gearbox to avoid the leakage of lubricating oil and oil mist, and improve the reliability of the sealing structure of the vertical gearbox and the sealing performance of the vertical gearbox.

[0006] To achieve this purpose, the technical solution adopted by the present invention is as follows:

[0007] A sealing structure for a vertical gearbox, comprising:

[0008] A through cover, sleeved on the transmission shaft of the vertical gearbox and installed on the box body of the vertical gearbox;

[0009] A dynamic ring, the inner side of the dynamic ring is interference-fitted on the transmission shaft, and a limiting groove is formed on the dynamic ring;

[0010] A static ring, one end of the static ring is connected to the through cover, and the other end passes through the limiting groove, so that the dynamic ring, the static ring and the through cover enclose an oil return cavity; a plurality of first tooth rings are arranged at intervals along the axial direction of the dynamic ring on the inner side wall of the limiting groove close to the oil return cavity, and a first labyrinth sealing structure is formed by surrounding the outer side of the static ring and the plurality of first tooth rings.

[0011] As a preferred solution, the end of the static ring extending into the limiting groove and the inner wall of the limiting groove jointly enclose a buffer cavity, and the buffer cavity is located above the first labyrinth sealing structure and is communicated with the first labyrinth sealing structure.

[0012] As a preferred solution, a main channel and a plurality of branch channels are formed in the moving ring. There is a first tooth groove between two adjacent first tooth rings. One ends of the plurality of branch channels communicate with the corresponding first tooth grooves respectively, and the other ends all communicate with the main channel. The main channel communicates with the oil return cavity.

[0013] As a preferred solution, a plurality of second tooth rings are arranged at intervals along the axial direction of the moving ring on the inner side wall of the limiting groove away from the oil return cavity. A second labyrinth seal structure is formed by enclosing the inner side of the static ring and the plurality of second tooth rings. The second labyrinth seal structure communicates with the buffer cavity.

[0014] As a preferred solution, the second tooth ring extends obliquely upward along the axial direction of the moving ring; when the moving ring rotates with the transmission shaft, the lubricating oil in the second labyrinth seal structure enters the buffer cavity along the side surface of the second tooth ring.

[0015] As a preferred solution, the moving ring includes:

[0016] A first ring body, which is interference-fitted on the transmission shaft. A plurality of the first tooth rings are arranged at intervals along the axial direction of the inner side wall of the first ring body. The main channel and the plurality of branch channels are formed in the first ring body. The first ring body, the static ring and the through cover enclose the oil return cavity; and

[0017] A second ring body, which is coaxial with the first ring body and is interference-fitted on the transmission shaft; the second ring body is located below the first ring body and encloses the limiting groove with the first ring body. A plurality of the second tooth rings are arranged at intervals along the axial direction of the outer side wall of the second ring body.

[0018] As a preferred solution, the first ring body includes:

[0019] A first horizontal ring, which is interference-fitted on the transmission shaft. The second ring body is located below the first horizontal ring; and

[0020] A first vertical ring, one end of which in the axial direction is connected to the outer side of the first horizontal ring. A plurality of the first tooth rings are arranged at intervals along the axial direction of the inner side wall of the first vertical ring. The main channel and the plurality of branch channels are formed in the first vertical ring.

[0021] As a preferred solution, the static ring includes:

[0022] A second vertical ring, one end of which in the axial direction is inserted into the limiting groove; and

[0023] A second horizontal ring, the other end of the second vertical ring in the axial direction is connected to the second horizontal ring, so that the longitudinal section of the static ring is L-shaped;

[0024] An annular mounting seat is provided on the inner side of the transparent cover. The lower end surface of the mounting seat is connected to the upper end surface of the second horizontal ring, and the inner side surface of the mounting seat is in contact with the outer side surface of the second vertical ring.

[0025] As a preferred solution, the mounting seat and the second horizontal ring are fixedly connected by bolts.

[0026] As a preferred solution, the stationary ring is an aluminum alloy ring.

[0027] The beneficial effects of the present invention are as follows:

[0028] For the sealing structure of the vertical gearbox proposed by the present invention, the moving ring, the stationary ring and the transparent cover enclose an oil return cavity. The outer side of the stationary ring and multiple first tooth rings of the moving ring enclose a first labyrinth sealing structure, so that multiple seals are formed between the moving ring and the stationary ring, improving the sealing performance between the moving ring and the stationary ring, and preventing the lubricating oil in the oil return cavity and the oil mist generated by the high-speed rotation of the moving ring from leaking from the first labyrinth sealing structure, thereby improving the reliability of the sealing structure of the vertical gearbox. In addition, since multiple tooth rings are axially distributed along the moving ring, the lubricating oil entering the first labyrinth sealing structure can flow back to the oil return cavity under the action of its own gravity, further improving the sealing performance and reliability of the first labyrinth sealing structure. Description of the Drawings

[0029] Figure 1 is a partial cross-sectional view of the vertical gearbox provided by an embodiment of the present invention;

[0030] Figure 2 is Figure 1 a partial enlarged view of part A in

[0031] The names and reference numerals of the components in the figure are as follows:

[0032] 10, housing; 20, transmission shaft; 30, bearing;

[0033] 1, transparent cover; 11, oil return cavity; 12, mounting seat;

[0034] 2, moving ring; 21, first ring body; 210, buffer cavity; 211, first horizontal ring; 212, first vertical ring; 2121, first tooth ring; 2122, main channel; 2123, branch channel; 2124, tooth groove; 22, second ring body; 221, second tooth ring;

[0035] 3, stationary ring; 31, second vertical ring; 32, second horizontal ring. Detailed Embodiments

[0036] To make the technical problems solved by the present invention, the adopted technical solutions and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present invention are shown in the drawings, rather than all of them.

[0037] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the upper side", and "on the upper surface" of the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the lower side", and "on the lower surface" of the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0039] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0040] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments.

[0041] As Figure 1 shown, the vertical gearbox of this embodiment includes a box body 10, a transmission shaft 20, a bearing 30, and a gland 1. The transmission shaft 20 extends in the vertical direction and extends out of the lower side of the box body 10. The transmission shaft 20 is rotatably installed on the side wall of the box body 10 through the bearing 30. The gland 1 is sleeved on the transmission shaft 20 of the vertical gearbox and installed on the box body 10.

[0042] To ensure good lubrication effect and sealing performance, the existing moving ring is press-fitted on the transmission shaft 20. The static ring is installed on the through cover 1 and forms a non-contact sealing structure with the moving ring. The through cover 1, the moving ring and the static ring jointly enclose an oil return cavity. The lubricating oil at the bearing 30 flows into the oil return cavity under its own gravity and then re-enters the oil sump in the box body 10. When the transmission shaft 20 rotates at a high speed, the moving ring has a high rotational speed and linear velocity. The lubricating oil at the bearing 30 falls on the moving ring and is thrown out at a high speed by the moving ring, so that the lubricating oil is likely to leak from the gap between the moving ring and the static ring. Moreover, the high-speed rotating moving ring easily atomizes the thrown-out lubricating oil into an oil mist, further increasing the leakage amount in the gap between the moving ring and the static ring and reducing the reliability of the non-contact sealing structure.

[0043] To solve the above problems, as Figure 1 and Figure 2 shown, this embodiment proposes a sealing structure for a vertical gearbox, which specifically includes the above-mentioned through cover 1, moving ring 2 and static ring 3. The inner side of the moving ring 2 is press-fitted on the transmission shaft 20, and a limiting groove is formed on the moving ring 2. One end of the static ring 3 is connected to the through cover 1, and the other end passes through the limiting groove, so that the moving ring 2, the static ring 3 and the through cover 1 enclose an oil return cavity 11. A plurality of first tooth rings 2121 are arranged at intervals along the axial direction of the moving ring 2 on the inner side wall of the limiting groove close to the oil return cavity 11, and the outer side of the static ring 3 and the plurality of first tooth rings 2121 enclose and form a first labyrinth sealing structure.

[0044] As Figure 2 shown, the moving ring 2, the static ring 3 and the through cover 1 enclose an oil return cavity 11, and the outer side of the static ring 3 and the plurality of first tooth rings 2121 of the moving ring 2 enclose and form a first labyrinth sealing structure, so that multiple seals are formed between the moving ring 2 and the static ring 3, improving the sealing performance between the moving ring 2 and the static ring 3, avoiding the leakage of the lubricating oil in the oil return cavity 11 and the oil mist generated by the high-speed rotation of the moving ring 2 from the first labyrinth sealing structure, and improving the reliability of the sealing structure of the vertical gearbox. In addition, since the plurality of first tooth rings 2121 are axially distributed along the moving ring 2, the lubricating oil entering the first labyrinth sealing structure can flow back to the oil return cavity 11 under its own gravity, further improving the sealing performance and reliability of the first labyrinth sealing structure.

[0045] As Figure 2 shown, the end of the static ring 3 extending into the limiting groove and the inner wall of the limiting groove jointly enclose a buffer cavity 210. The buffer cavity 210 is located above the first labyrinth sealing structure and is communicated with the first labyrinth sealing structure. A small amount of lubricating oil passing through the first labyrinth sealing structure can gather in the buffer cavity 210 and flow back to the oil return cavity 11 through the first labyrinth sealing structure again under its own gravity.

[0046] It should be noted that the wall thickness of the stationary ring 3 in this embodiment is less than the groove width of the limiting groove, so that the buffer cavity 210 is approximately an inverted L shape, with the horizontal part of the buffer cavity 210 on the top and the vertical part on the bottom. The vertical part is communicated with the first labyrinth seal structure, so that the lubricating oil in the buffer cavity 210 can all flow back to the oil return cavity 11, thus avoiding the accumulation of lubricating oil in the buffer cavity 210.

[0047] Preferably, a main channel 2122 and a plurality of branch channels 2123 are formed in the moving ring 2. There is a first tooth groove 2124 between two adjacent first tooth rings 2121. One ends of the plurality of branch channels 2123 are respectively communicated with the corresponding first tooth grooves 2124, and the other ends are all communicated with the main channel 2122. The main channel 2122 is communicated with the oil return cavity 11. It should be noted that one of the branch channels 2123 is communicated with the bottom (vertical part) of the buffer cavity 210, and the remaining branch channels 2123 are communicated with the corresponding first tooth grooves 2124, thereby improving the return efficiency of the lubricating oil in the first labyrinth seal structure and the buffer cavity 210, which is beneficial to improving the sealing effect of the sealing structure of the vertical gearbox.

[0048] Furthermore, as Figure 2 shown, a plurality of second tooth rings 221 are arranged at intervals along the axial direction of the moving ring 2 on the inner side wall of the limiting groove away from the oil return cavity 11. The inner side of the stationary ring 3 and the plurality of second tooth rings 221 enclose a second labyrinth seal structure, and the second labyrinth seal structure is communicated with the buffer cavity 210. The second labyrinth seal structure and the first labyrinth structure are respectively located on the inner and outer sides of the stationary ring 3, forming a double seal, which further improves the sealing effect of the sealing structure of the vertical gearbox.

[0049] It should be noted that the second tooth ring 221 extends obliquely upward along the axial direction of the moving ring 2. When the moving ring 2 rotates with the transmission shaft 20, the lubricating oil in the second labyrinth seal structure enters the buffer cavity 210 along the inclined surface of the second tooth ring 221. That is, the rotating moving ring 2 can make the lubricating oil in the second labyrinth seal structure have a high centrifugal force, so that the lubricating oil can be obliquely thrown upward along the inclined surface of the second tooth ring 221 into the buffer cavity 210, and then enter the main channel 2122 through the branch channel 2123 communicated with the buffer cavity 210, and finally flow back to the oil return cavity 11, avoiding the leakage of the lubricating oil from the second labyrinth seal structure and ensuring the good sealing performance of the sealing structure of the vertical gearbox.

[0050] In this embodiment, the moving ring 2 can be of a split structure, which is convenient for processing and installation, reduces the manufacturing cost of the moving ring 2, and improves the installation efficiency. Of course, the moving ring 2 can also be set as an integral structure.

[0051] Specifically, the moving ring 2 includes a first ring body 21 and a second ring body 22. The first ring body 21 is press-fitted on the transmission shaft 20. A plurality of first toothed rings 2121 are arranged at intervals along the axial direction on the inner side wall of the first ring body 21. A main channel 2122 and a plurality of branch channels 2123 are formed in the first ring body 21. The first ring body 21, the stationary ring 3 and the through cover 1 enclose an oil return cavity 11. The second ring body 22 is coaxial with the first ring body 21 and is press-fitted on the transmission shaft 20. The second ring body 22 is located below the first ring body 21 and encloses a limiting groove with the first ring body 21. A plurality of second toothed rings 221 are arranged at intervals along the axial direction on the outer side wall of the second ring body 22.

[0052] As Figure 2 shown, the first ring body 21 includes a first horizontal ring 211 and a first vertical ring 212. The first horizontal ring 211 is press-fitted on the transmission shaft 20, and the second ring body 22 is located below the first horizontal ring 211. One end of the first vertical ring 212 in the axial direction is connected to the outside of the first horizontal ring 211. A plurality of first toothed rings 2121 are arranged at intervals along the axial direction on the inner side wall of the first vertical ring 212. A main channel 2122 and a plurality of branch channels 2123 are formed in the first vertical ring 212.

[0053] It should be noted that the outer side surface of the first horizontal ring 211 is arc-shaped and is located directly below the bearing 30, so as to play a role in guiding and draining the lubricating oil in the bearing 30, so that more lubricating oil enters the oil return cavity 11, effectively reducing the lubricating oil entering the first labyrinth seal structure.

[0054] As Figure 2 shown, the stationary ring 3 includes a second vertical ring 31 and a second horizontal ring 32. One end of the second vertical ring 31 in the axial direction is inserted into the limiting groove. The other end of the second vertical ring 31 in the axial direction is connected to the second horizontal ring 32, so that the longitudinal section of the stationary ring 3 is L-shaped. An annular mounting seat 12 is arranged on the inner side of the through cover 1. The lower end surface of the mounting seat 12 is connected to the upper end surface of the second horizontal ring 32, and the inner side surface of the mounting seat 12 is attached to the outer side surface of the second vertical ring 31.

[0055] Specifically, both the second horizontal ring 32 and the second vertical ring 31 are in contact with the mounting seat 12, so that there is an L-shaped sealing structure between the stationary ring 3 and the through cover 1, thereby improving the sealing performance between the stationary ring 3 and the through cover 1, avoiding leakage of lubricating oil between the stationary ring 3 and the mounting seat 12, and ensuring the sealing performance of the oil return cavity 11.

[0056] In this embodiment, the mounting seat 12 and the second horizontal ring 32 are fixedly connected by bolts, which improves the connection strength and stability between the stationary ring 3 and the mounting seat 12. At the same time, the bolt fixing method not only improves the installation efficiency of the stationary ring 3, but also facilitates the disassembly, installation and replacement of the stationary ring 3.

[0057] Preferably, the stationary ring 3 is an aluminum alloy ring, which has good heat dissipation and fire resistance properties, can avoid the occurrence of arcing between the rotating ring 2 and the stationary ring 3 during high-speed rotation, and improves the safety of the vertical gearbox. It can be understood that the stationary ring 3 can also be made of other fire-resistant metal materials, as long as it can avoid the occurrence of arcing between the rotating ring 2 and the stationary ring 3 during high-speed rotation, and no specific limitation is made here.

[0058] The above embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for a vertical gearbox, characterized in that, Comprising: A transparent cover (1), sleeved on the transmission shaft (20) of the vertical gearbox and installed on the box body (10) of the vertical gearbox; A moving ring (2), the inner side of the moving ring (2) is interference-fitted on the transmission shaft (20), and a limiting groove is formed on the moving ring (2); A static ring (3), one end of the static ring (3) is connected to the transparent cover (1), and the other end penetrates into the limiting groove, so that the moving ring (2), the static ring (3) and the transparent cover (1) enclose an oil return cavity (11); a plurality of first tooth rings (2121) are arranged at intervals along the axial direction of the moving ring (2) on the inner side wall of the limiting groove close to the oil return cavity (11), and a first labyrinth seal structure is formed by surrounding the outer side of the static ring (3) and the plurality of first tooth rings (2121), and a buffer cavity (210) is formed by surrounding the end of the static ring (3) extending into the limiting groove and the inner wall of the limiting groove, and the buffer cavity (210) is located above the first labyrinth seal structure and communicated with the first labyrinth seal structure; A plurality of second tooth rings (221) are arranged at intervals along the axial direction of the moving ring (2) on the inner side wall of the limiting groove far from the oil return cavity (11), and a second labyrinth seal structure is formed by surrounding the inner side of the static ring (3) and the plurality of second tooth rings (221), and the second labyrinth seal structure is communicated with the buffer cavity (210); the second tooth ring (221) extends obliquely upward along the axial direction of the moving ring (2); when the moving ring (2) rotates with the transmission shaft (20), the lubricating oil in the second labyrinth seal structure enters the buffer cavity (210) along the side surface of the second tooth ring (221).

2. The sealing structure of the vertical gearbox according to claim 1, characterized in that A main channel (2122) and a plurality of branch channels (2123) are formed in the moving ring (2), a first tooth groove (2124) is formed between two adjacent first tooth rings (2121), one ends of the plurality of branch channels (2123) are respectively communicated with the corresponding first tooth grooves (2124), and the other ends are all communicated with the main channel (2122), and the main channel (2122) is communicated with the oil return cavity (11).

3. The sealing structure of the vertical gearbox according to claim 2, characterized in that, The moving ring (2) includes: A first ring body (21), interference-fitted on the transmission shaft (20), a plurality of the first tooth rings (2121) are arranged at intervals along the axial direction of the inner side wall of the first ring body (21), the main channel (2122) and a plurality of the branch channels (2123) are formed in the first ring body (21), and the first ring body (21), the static ring (3) and the transparent cover (1) enclose the oil return cavity (11); and A second ring body (22), coaxial with the first ring body (21) and interference-fitted on the transmission shaft (20); the second ring body (22) is located below the first ring body (21) and encloses the limiting groove with the first ring body (21), and a plurality of the second tooth rings (221) are arranged at intervals along the axial direction of the outer side wall of the second ring body (22).

4. The sealing structure of the vertical gearbox according to claim 3, characterized in that, The first ring body (21) includes: The first horizontal ring (211) is press-fitted on the transmission shaft (20), and the second ring body (22) is located below the first horizontal ring (211); and The first vertical ring (212), one end of its axis is connected to the outer side of the first horizontal ring (211), and a plurality of the first toothed rings (2121) are arranged at intervals along the axis of the inner side wall of the first vertical ring (212). A main channel (2122) and a plurality of branch channels (2123) are formed in the first vertical ring (212).

5. The sealing structure of the vertical gearbox according to claim 1, characterized in that, The stationary ring (3) includes: The second vertical ring (31), one end of its axis is inserted into the limiting groove; and The second horizontal ring (32), the other end of the second vertical ring (31) along its axis is connected to the second horizontal ring (32), so that the longitudinal section of the stationary ring (3) is L-shaped; An annular mounting seat (11) is arranged on the inner side of the through cover (1). The lower end surface of the mounting seat (11) is connected to the upper end surface of the second horizontal ring (32), and the inner side surface of the mounting seat (11) is attached to the outer side surface of the second vertical ring (31).

6. The sealing structure of the vertical gearbox according to claim 5, characterized in that, The mounting seat (11) and the second horizontal ring (32) are fixedly connected by bolts.

7. The sealing structure of the vertical gearbox according to claim 5, characterized in that, The stationary ring (3) is an aluminum alloy ring.

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