Shaft seal of step-up gear box

Abstract

The utility model discloses a step-up gear box shaft seal which comprises a gear box cover and a rotating shaft, a sealing groove is integrally formed in one side of the gear box cover, the gear box cover is rotationally connected with a main threaded rod located above the sealing groove in a penetrating mode, and the rotating shaft is rotationally connected with the middle of the sealing groove in a penetrating mode. And an elastic sealing ring is arranged in the sealing groove, a pressing ring which abuts against and makes contact with the elastic sealing ring is arranged in the sealing groove, the other side of the pressing ring is integrally connected with a connecting claw, and the tail end of the connecting claw is connected with the main threaded rod in a penetrating and threaded mode. The sealing groove is formed, the rotating shaft is sleeved with the elastic sealing ring, the main threaded rod is rotated, the connecting claw pushes the pressing ring to abut against the elastic sealing ring, the sealing effect is improved, the radial pressure of the elastic sealing ring and the rotating shaft is kept constant, a traditional shaft sealing structure is reserved, and the rotating resistance of the rotating shaft is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of shaft seals, in particular to a shaft seal for a speed increasing gearbox. Background Art

[0002] The speed increasing gearbox is one of the most important parts of the compressor unit. The power transmission in the compressor unit is carried out on it, and its quality directly affects the use of the compressor. Reasonable and effective shaft seal design can avoid the leakage of compressor lubricating oil and plays an important role in ensuring the continuous operation of the compressor. In the existing technology, a skeleton seal structure is usually used.

[0003] If the radial force of this skeleton seal structure is too small, leakage may occur easily; if the radial force is too large, dry friction may occur easily, resulting in lip burning.

[0004] Therefore, we propose a speed increasing gearbox shaft seal. Utility Model Content

[0005] The utility model aims to provide a shaft seal for a speed increasing gearbox to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a speed-increasing gearbox shaft seal, comprising a gearbox cover and a rotating shaft, a sealing groove is integrally provided on one side of the gearbox cover, the gearbox cover is rotatably connected with a main threaded rod located above the sealing groove, the rotating shaft is rotatably connected with the middle part of the sealing groove, an elastic sealing ring is provided inside the sealing groove, a pressure ring is provided inside the sealing groove and is in tight contact with the elastic sealing ring, a connecting claw is integrally connected to the other side of the pressure ring, and the end of the connecting claw is threadedly connected with the main threaded rod.

[0007] Optionally, a rotating seat is integrally provided on the inner side of the gear box cover, the inner side of the gear box cover is rotatably connected to a follower threaded rod located inside the rotating seat, and the interior of the rotating seat is rotatably connected to a gear ring.

[0008] Optionally, a driving gear is fixedly mounted on the end of the main threaded rod, and the driving gear is meshed with a gear ring; a follower gear is fixedly mounted on the end of the follower threaded rod, and the follower gear is meshed with a gear ring.

[0009] Optionally, a through groove is provided inside the elastic sealing ring, the through groove is close to a side of the pressure plate, a connecting hole connected to the through groove is provided on the inner wall of the elastic sealing ring, and a lubricating oil pipe is provided in communication with the through groove.

[0010] Optionally, a section of the main threaded rod above the sealing groove is provided with a hexagonal groove.

[0011] Optionally, the follower threaded rod is threadedly connected to the ends of the other two connecting claws, and the three connecting claws are evenly distributed on one side of the pressure ring.

[0012] Optionally, the rotating seat, the gear ring and the rotating shaft are coaxially arranged, and an O-ring is provided at the rotating connection between the sealing groove and the rotating shaft.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The shaft seal of the speed increasing gearbox is provided with a sealing groove, an elastic sealing ring is sleeved on the outside of the rotating shaft, and the main threaded rod is rotated so that the driving gear drives the gear ring to rotate, and then drives the follower gear and the follower threaded rod to rotate synchronously, and then drives the connecting claw to move, so that the connecting claw pushes the pressure ring and the elastic sealing ring to press tightly, thereby improving the sealing effect and keeping the radial pressure between the elastic sealing ring and the rotating shaft constant, which not only retains the traditional shaft seal structure but also reduces the resistance to the rotation of the rotating shaft.

[0015] 2. The shaft seal of the speed increasing gearbox is provided with a through groove, and lubricating oil is transported into the through groove through a lubricating oil pipe. The lubricating oil in the through groove flows into the rotating connecting surface between the rotating shaft and the elastic sealing ring through the connecting hole for lubrication. With the rotation of the rotating shaft and under the action of capillary phenomenon, the lubricating oil fills the connecting surface between the rotating shaft and the elastic sealing ring, thereby further reducing friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a shaft seal for a speed increasing gearbox according to the utility model;

[0017] Figure 2 This is a schematic structural diagram of a gear box cover of a speed increasing gear box shaft seal of the utility model;

[0018] Figure 3 This is a structural schematic diagram of a sealing groove of a shaft seal of a speed increasing gearbox of the utility model;

[0019] Figure 4 The utility model is a kind of speed increasing gear box shaft seal Figure 3 Enlarged view of point A in the middle.

[0020] In the figure: 1. gear box cover; 2. rotating shaft; 3. sealing groove; 4. elastic sealing ring; 5. pressure ring; 6. connecting claw; 7. main threaded rod; 8. driving gear; 9. follower threaded rod; 10. follower gear; 11. rotating seat; 12. gear ring; 13. through groove; 14. connecting hole; 15. lubricating oil pipe; 16. O-ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figures 1 to 4 The utility model provides a speed increasing gearbox shaft seal, including a gearbox cover 1 and a rotating shaft 2. A sealing groove 3 is integrally arranged on one side of the gearbox cover 1. A main threaded rod 7 located above the sealing groove 3 is rotatably connected to the gearbox cover 1. The rotating shaft 2 is rotatably connected to the middle part of the sealing groove 3. An elastic sealing ring 4 is arranged inside the sealing groove 3. A pressure ring 5 that is in close contact with the elastic sealing ring 4 is arranged inside the sealing groove 3. A connecting claw 6 is integrally connected to the other side of the pressure ring 5. The end of the connecting claw 6 is threadedly connected to the main threaded rod 7 through the main threaded rod 7. By setting the sealing groove 3, the elastic sealing ring 4 is sleeved on the outside of the rotating shaft 2. The main threaded rod 7 is rotated so that the driving gear 8 drives the gear ring 12 to rotate, thereby driving the follower gear 10 and the follower threaded rod 9 to rotate synchronously, thereby driving the connecting claw 6 to move, so that the connecting claw 6 pushes the pressure ring 5 to press against the elastic sealing ring 4, thereby improving the sealing effect, and keeping the radial pressure between the elastic sealing ring 4 and the rotating shaft 2 constant, thereby retaining the traditional shaft seal structure and reducing the resistance to the rotation of the rotating shaft 2.

[0023] A rotating seat 11 is integrally provided on the inner side of the gear box cover 1 , and a follower threaded rod 9 located inside the rotating seat 11 is rotatably connected to the inner side of the gear box cover 1 , and a gear ring 12 is rotatably connected to the inside of the rotating seat 11 .

[0024] A driving gear 8 is fixedly mounted on the end of the main threaded rod 7 , and the driving gear 8 is meshed with a gear ring 12 . A follower gear 10 is fixedly mounted on the end of the follower threaded rod 9 , and the follower gear 10 is meshed with the gear ring 12 .

[0025] A through groove 13 is provided inside the elastic sealing ring 4. A connecting hole 14 connected to the through groove 13 is provided on the inner wall of the elastic sealing ring 4 on one side of the through groove 13 close to the pressure plate. A lubricating oil pipe 15 is provided in communication with the through groove 13. By providing the through groove 13, lubricating oil is transported to the inside of the through groove 13 through the lubricating oil pipe 15. The lubricating oil inside the through groove 13 flows into the rotating connecting surface between the rotating shaft 2 and the elastic sealing ring 4 through the connecting hole 14 for lubrication. As the rotating shaft 2 rotates and under the action of capillary phenomenon, the lubricating oil fills the connecting surface between the rotating shaft 2 and the elastic sealing ring 4, further reducing friction.

[0026] A section of the main threaded rod 7 located above the sealing groove 3 is provided with a hexagonal groove.

[0027] The follower threaded rod 9 is threadedly connected to the ends of the other two connection claws 6 , and the three connection claws 6 are evenly distributed on one side of the pressure ring 5 .

[0028] The rotating seat 11 , the gear ring 12 and the rotating shaft 2 are coaxially arranged, and an O-ring 16 is arranged at the rotating connection between the sealing groove 3 and the rotating shaft 2 .

[0029] Working principle:

[0030] The elastic sealing ring 4 is sleeved on the outside of the rotating shaft 2, and the main threaded rod 7 is rotated, so that the driving gear 8 drives the gear ring 12 to rotate, and then drives the driven gear 10 and the driven threaded rod 9 to rotate synchronously, and then drives the connecting claw 6 to move, so that the connecting claw 6 pushes the pressure ring 5 and the elastic sealing ring 4 to be tightly pressed, thereby improving the sealing effect, and keeping the radial pressure of the elastic sealing ring 4 and the rotating shaft 2 constant, which not only retains the traditional shaft sealing structure, but also reduces the resistance to the rotation of the rotating shaft 2. The lubricating oil is transported to the inside of the through groove 13 through the lubricating oil pipe 15, and the lubricating oil in the through groove 13 flows into the rotating connection surface of the rotating shaft 2 and the elastic sealing ring 4 through the connecting hole 14 for lubrication. With the rotation of the rotating shaft 2 and under the action of capillary phenomenon, the lubricating oil fills the connection surface between the rotating shaft 2 and the elastic sealing ring 4, further reducing the friction.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A speed increasing gearbox shaft seal, comprising a gearbox cover (1) and a rotating shaft (2), characterized in that: A sealing groove (3) is integrally provided on one side of the gear box cover (1); a main threaded rod (7) located above the sealing groove (3) is rotatably connected to the gear box cover (1); the rotating shaft (2) is rotatably connected to the middle of the sealing groove (3); an elastic sealing ring (4) is provided inside the sealing groove (3); a pressure ring (5) in tight contact with the elastic sealing ring (4) is provided inside the sealing groove (3); a connecting claw (6) is integrally connected to the other side of the pressure ring (5); and the end of the connecting claw (6) is threadably connected to the main threaded rod (7).

2. A speed increasing gearbox shaft seal according to claim 1, characterized in that: A rotating seat (11) is integrally provided on the inner side of the gear box cover (1), a follower threaded rod (9) located inside the rotating seat (11) is rotatably connected to the inner side of the gear box cover (1), and a gear ring (12) is rotatably connected to the interior of the rotating seat (11).

3. A speed increasing gearbox shaft seal according to claim 2, characterized in that: A driving gear (8) is fixedly mounted on the end of the main threaded rod (7), and the driving gear (8) is meshed with a gear ring (12). A follower gear (10) is fixedly mounted on the end of the follower threaded rod (9), and the follower gear (10) is meshed with the gear ring (12).

4. The shaft seal of a speed increasing gearbox according to claim 1, characterized in that: A through groove (13) is provided inside the elastic sealing ring (4), and the through groove (13) is close to one side of the pressure plate. A connecting hole (14) communicating with the through groove (13) is provided on the inner wall of the elastic sealing ring (4), and a lubricating oil pipe (15) is provided in communication with the through groove (13).

5. The speed increasing gearbox shaft seal according to claim 1, characterized in that: A section of the main threaded rod (7) located above the sealing groove (3) is provided with a hexagonal groove.

6. The shaft seal of a speed increasing gearbox according to claim 2, characterized in that: The follower threaded rod (9) is threadedly connected to the ends of the other two connecting claws (6), and the three connecting claws (6) are evenly distributed on one side of the pressure ring (5).

7. The speed increasing gearbox shaft seal according to claim 2, characterized in that: The rotating seat (11), the gear ring (12) and the rotating shaft (2) are coaxially arranged, and an O-ring (16) is arranged at the rotating connection between the sealing groove (3) and the rotating shaft (2).

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