Labyrinth seal for a lubrication pump with helical grooves

Abstract

The utility model discloses a kind of labyrinth seal devices of lubricating pump with spiral groove, including fixed ring and rotating ring, the outside fixed connection of fixed ring has connecting ring, the outside of connecting ring is perforated and is provided with opening, the inside fixed connection of fixed ring has labyrinth tooth, the inside of fixed ring is provided with slot, the inside fixed connection of slot has support ring, the inside fixed connection of support ring has return spring, the inside sliding connection of slot has moving ring, the outside fixed connection of fixed ring has outer labyrinth ring, the outside fixed connection of rotating ring has butt joint ring, the inside of butt joint ring is provided with thread groove, the inside of rotating ring is provided with connecting thread, the outside fixed connection of rotating ring has inner labyrinth ring, fixed ring is located the outside of rotating ring. By the above structure, fluid dynamic pressure effect of spiral groove can be used to actively return oil, and more suitable for the use of lubricating pump.

Description

Technical Field

[0001] This utility model relates to the field of sealing device technology, and in particular to a labyrinth seal device for a lubrication pump with spiral grooves. Background Technology

[0002] A lubrication pump is a device used to deliver lubricant to friction parts of mechanical equipment. It is mainly classified into manual, electric, pneumatic, gear pumps, and piston pumps, and features functions such as metered oil supply, timed lubrication, multi-channel distribution, and fault alarms. It is widely used in industrial machinery, transportation, heavy equipment, and energy sectors.

[0003] In existing technologies, some labyrinth seal devices for lubrication pumps lack spiral grooves. Their passive throttling sealing mechanism lacks active oil return capability, leading to a significant increase in leakage under high pressure exceeding 0.3 MPa or high speed exceeding 3000 rpm. After long-term operation, wear-induced gap widening can increase leakage by 30% to 50%, requiring frequent oil replenishment. Furthermore, this structure is sensitive to equipment vibration and temperature changes, resulting in poor system stability. More importantly, its 5% to 8% lubricant leakage rate not only causes waste but also necessitates a larger oil supply device, which is not well-suited for the use of lubrication pumps. Utility Model Content

[0004] The purpose of this invention is to provide a labyrinth seal device for a lubrication pump with a spiral groove, which can actively return oil through the hydrodynamic pressure effect of the spiral groove, making it more suitable for the use of lubrication pumps.

[0005] To achieve the above objectives, a labyrinth seal device for a lubrication pump with a spiral groove is provided, comprising a fixed ring and a rotating ring. A connecting ring is fixedly connected to the outside of the fixed ring, and an opening is formed through the outside of the connecting ring. Labyrinth teeth are fixedly connected to the inside of the fixed ring, and a groove is formed inside the fixed ring. A support ring is fixedly connected to the inside of the groove, and a return spring is fixedly connected to the inside of the support ring. A moving ring is slidably connected to the inside of the groove, and an outer labyrinth ring is fixedly connected to the inside of the fixed ring. The rotating ring is fixedly connected to a mating ring on the outside, the mating ring has a threaded groove inside, the rotating ring has a connecting thread inside, and the rotating ring is fixedly connected to an inner labyrinth ring on the outside.

[0006] According to the aforementioned labyrinth seal device for a lubrication pump with spiral grooves, the fixed ring is located outside the rotating ring, and the fixed ring is rotatably connected to the rotating ring.

[0007] According to the aforementioned labyrinth seal device for a lubrication pump with spiral grooves, the labyrinth teeth are located outside the mating ring, and the labyrinth teeth are rotatably connected to the mating ring.

[0008] According to the aforementioned labyrinth seal device for a lubrication pump with spiral grooves, the return spring is located behind the moving ring, and the return spring abuts against the moving ring.

[0009] According to the aforementioned labyrinth seal device for a lubrication pump with spiral grooves, the movable ring is located outside the rotating ring, and the movable ring is slidably connected to the rotating ring.

[0010] According to the aforementioned labyrinth seal device for a lubrication pump with spiral grooves, the outer labyrinth ring is located outside the inner labyrinth ring, and the outer labyrinth ring is rotatably connected to the inner labyrinth ring.

[0011] This utility model has the following beneficial effects: 1. Compared with existing technologies, this seal features a mating ring with internal threaded grooves. The rotation of these grooves generates a hydrodynamic pressure effect through the unique spiral groove structure, actively pumping leaking oil back to the lubrication chamber. This significantly reduces leakage compared to ordinary labyrinth seals, making it particularly suitable for high pressure differential conditions. Its non-contact design offers excellent dynamic adaptability, automatically compensating for shaft runout and maintaining stable sealing performance across a wide speed and temperature range, greatly improving lubricant utilization. This structure not only extends service life but also integrates perfectly with various rotating equipment, significantly reducing system energy consumption and maintenance costs while improving sealing reliability. Furthermore, the active oil return via the hydrodynamic pressure effect of the spiral grooves makes it more compatible with lubrication pumps. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a perspective view of a labyrinth seal device for a lubrication pump with spiral grooves according to the present invention. Figure 2 This is a cross-sectional view of a labyrinth seal device for a lubrication pump with spiral grooves according to the present invention. Figure 3 This is a first-view view of the internal structure of a labyrinth seal device for a lubrication pump with spiral grooves according to this utility model. Figure 4 This is a second-view view of the internal structure of a labyrinth seal device for a lubrication pump with spiral grooves according to this utility model.

[0013] Legend: 1. Fixed ring; 2. Connecting ring; 3. Opening; 4. Labyrinth tooth; 5. Groove; 6. Support ring; 7. Return spring; 8. Moving ring; 9. Outer labyrinth ring; 10. Rotating ring; 11. Butt ring; 12. Threaded groove; 13. Connecting thread; 14. Inner labyrinth ring. Detailed Implementation

[0014] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0015] Reference Figure 1-4 This utility model discloses a labyrinth seal device for a lubrication pump with a spiral groove, comprising a fixed ring 1 and a rotating ring 10. The fixed ring 1 is located outside the rotating ring 10 and is rotatably connected to the rotating ring 10. A connecting ring 2 is fixedly connected to the outside of the fixed ring 1, and an opening 3 is formed through the outside of the connecting ring 2. A labyrinth tooth 4 is fixedly connected inside the fixed ring 1, located outside the docking ring 11, and is rotatably connected to the docking ring 11. A groove 5 is formed inside the fixed ring 1, and a support ring 6 is fixedly connected inside the groove 5. A return spring 7 is fixedly connected inside the support ring 6. The positioning spring 7 is located behind the moving ring 8, and the return spring 7 abuts against the moving ring 8. The moving ring 8 is slidably connected inside the slot 5. The moving ring 8 is located outside the rotating ring 10, and the moving ring 8 and the rotating ring 10 are slidably connected. The outer labyrinth ring 9 is fixedly connected inside the fixed ring 1. The outer labyrinth ring 9 is located outside the inner labyrinth ring 14, and the outer labyrinth ring 9 and the inner labyrinth ring 14 are rotatably connected. The outer rotating ring 10 is fixedly connected to the outside of the rotating ring 10. The inner labyrinth ring 11 has a threaded groove 12. The inner rotating ring 10 has a connecting thread 13. The outer rotating ring 10 is fixedly connected to the outside of the rotating ring 10.

[0016] The above structure includes a connecting ring 2 with an opening 3 through the outside of the connecting ring 2, allowing the connecting ring 2 to be connected to the housing of the lubrication pump, and fixing the fixing ring 1 to the outside of the lubrication pump.

[0017] By providing a rotating ring 10, and having a connecting thread 13 inside the rotating ring 10, the operator can connect the rotating shaft to the rotating ring 10 via the connecting thread 13.

[0018] By incorporating labyrinth teeth 4, the oil inside the lubrication pump can be throttled both initially and secondarily. An outer labyrinth ring 9 is positioned outside the inner labyrinth ring 14, rotatably connected to it with a certain gap between them. This allows the oil inside the lubrication pump to be throttled three times through the interaction of the different teeth.

[0019] By incorporating a mating ring 11 with internal threaded grooves 12, the rotation of these grooves generates a hydrodynamic pressure effect through the unique spiral groove structure, actively pumping leaking oil back to the lubrication chamber. This significantly reduces leakage compared to ordinary labyrinth seals, making it particularly suitable for high pressure differential conditions. Its non-contact design offers excellent dynamic adaptability, automatically compensating for shaft runout and maintaining stable sealing performance across a wide speed and temperature range, greatly improving lubricant utilization. This structure not only extends service life but also integrates seamlessly with various rotating equipment, significantly reducing system energy consumption and maintenance costs while enhancing sealing reliability.

[0020] The system is equipped with a docking ring 11, and the docking ring 11 is externally rotatably connected to a labyrinth tooth 4, with a certain gap between the two.

[0021] The device incorporates a fixed ring 1 and a rotating ring 10, both made of copper alloy. Copper alloy, as the core material of the sealing device, performs exceptionally well under high-speed and high-pressure conditions due to its superior thermal conductivity and self-lubricating properties. The addition of elements such as tin and aluminum creates a hardened phase that significantly enhances its wear resistance while also providing excellent corrosion resistance. Its unique anti-galling properties effectively prevent cold welding to steel shafts. Combined with its excellent process adaptability, this makes it an ideal choice for demanding applications such as marine stern shaft seals, high-pressure plunger pumps, and chemical equipment, demonstrating irreplaceable material advantages in the field of mechanical seals. The thermal conductivity of copper alloy ranges from 80 to 400 W / mK, the coefficient of friction is maintained between 0.08 and 0.15, the corrosion rate of aluminum bronze in seawater is less than 0.05 mm per year, the casting shrinkage rate is controlled within the range of 1.2% to 1.8%, and the surface roughness can reach below Ra 0.8 micrometers. Therefore, copper alloy is chosen as the material for both components.

[0022] Working principle: This labyrinth seal device for lubrication pumps with spiral grooves uses a fixed ring 1 fixed to the outside of the lubrication pump and a rotating ring 10 fixed to the inside of the shaft. Through the action of the two, the lubrication pump can be dynamically sealed.

[0023] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A labyrinth seal device for a lubrication pump with spiral grooves, characterized in that, Includes a fixed ring (1) and a rotating ring (10). The fixed ring (1) is fixedly connected to a connecting ring (2) on the outside. The connecting ring (2) has a through hole (3) on the outside. The fixed ring (1) is fixedly connected to a labyrinth tooth (4) on the inside. The fixed ring (1) has a slot (5) on the inside. The slot (5) is fixedly connected to a support ring (6). The support ring (6) is fixedly connected to a return spring (7). The slot (5) is slidably connected to a moving ring (8). The fixed ring (1) is fixedly connected to an outer labyrinth ring (9). The rotating ring (10) is fixedly connected to the outside of a docking ring (11), the docking ring (11) has a threaded groove (12) inside, the rotating ring (10) has a connecting thread (13) inside, and the rotating ring (10) is fixedly connected to the outside of an inner labyrinth ring (14).

2. The labyrinth seal device for a lubrication pump with spiral grooves according to claim 1, characterized in that, The fixed ring (1) is located outside the rotating ring (10), and the fixed ring (1) is rotatably connected to the rotating ring (10).

3. The labyrinth seal device for a lubrication pump with spiral grooves according to claim 1, characterized in that, The labyrinth tooth (4) is located outside the docking ring (11), and the labyrinth tooth (4) is rotatably connected to the docking ring (11).

4. The labyrinth seal device for a lubrication pump with spiral grooves according to claim 1, characterized in that, The reset spring (7) is located behind the moving ring (8), and the reset spring (7) abuts against the moving ring (8).

5. A labyrinth seal device for a lubrication pump with spiral grooves according to claim 1, characterized in that, The movable ring (8) is located outside the rotating ring (10), and the movable ring (8) is slidably connected to the rotating ring (10).

6. A labyrinth seal device for a lubrication pump with spiral grooves according to claim 1, characterized in that, The outer maze ring (9) is located outside the inner maze ring (14), and the outer maze ring (9) is rotatably connected to the inner maze ring (14).

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