Pumping sealing device
By using a multi-lip polyurethane spiral sealing structure on the main bearing of the wind turbine, the problem of grease leakage was solved, achieving a zero-leakage effect and extending the service life.
Patent Information
- Application Number
- CN202520483031.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-19
AI Technical Summary
In the prior art, grease leakage occurs in the main shaft bearing of wind turbines. In the prior art, the main drive sealing structure of wind turbines cannot effectively prevent grease leakage. In the design of the main bearing of wind turbines, the sealing structure cannot effectively prevent grease leakage, resulting in serious grease leakage, affecting the safe operation of wind turbines and increasing maintenance costs.
It adopts a multi-lip sealing structure and uses polyurethane material with excellent wear resistance. The spiral design can seal the grease layer by layer. Even a small amount of leakage can be pumped back to the grease chamber to achieve zero leakage. It can directly replace the existing seal without adjusting the design or replacing parts.
It achieves a zero-leakage sealing effect, extends service life, reduces grease waste and downtime for maintenance, and is suitable for severely worn old bearings.
Smart Images
Figure CN223825599U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of pump suction sealing devices, and in particular to pump suction sealing devices. Background Technology
[0002] Wind turbine main shaft bearings typically employ labyrinth seals, V-shaped water seals, or lip seals to prevent grease leakage. Traditional wind turbine main drive seals include labyrinth seals, end face seals, and lip seals. Labyrinth seals, also known as "maze seals," have an L-shaped bend at the grease leakage channel—the junction of the bushing and the baffle—to increase grease flow resistance. This structure is effective for small amounts of grease, but due to the large size of wind turbines and the large amount of grease injected, accumulated grease will leak through the gaps in the labyrinth seal under gravity. V-shaped seals, on the other hand, have poor sealing performance and cause significant grease leakage. The blue one represents a V-shaped end face seal made of synthetic rubber. After being tightened, it is clamped onto the shaft, with the lip contacting the housing. The interference fit between the lip and the housing provides a seal. The V-shaped sealing ring has a small contact force and cannot effectively prevent the leakage of lubricating grease. This type of seal is being phased out. The lip seal is fitted into the groove of the housing. The lip 5 is interference-fitted with the rotating shaft. The tension spring 3 keeps the lip in contact with the shaft. The fiber fabric 1 provides a skeleton support. The main disadvantages are that the load provided by the tension spring is limited and cannot ensure the sealing force of the lip. Lubricating grease accumulates on the lip, causing a gap between the lip and the shaft, which leads to leakage. The sealing lip is prone to wear, leading to seal failure and leakage. It is not suitable for large-size or large-eccentric applications.
[0003] The present invention aims to provide a novel sealing structure that can effectively prevent the leakage of lubricating grease from the main shaft of the blower, ensure the safe operation of the blower, and reduce waste and the loss of manpower and material resources caused by downtime for maintenance. Utility Model Content
[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art by providing a pump suction sealing device. This seal is a multi-lip seal, which can seal grease layer by layer, resulting in a good sealing effect and preventing grease leakage from the main bearing. The multi-lip design of this seal is spiral, so even if a small amount of grease leaks into the middle, it can be pumped back to the grease chamber by the spiral action, preventing grease from leaking to the air side and achieving zero leakage. It can also directly replace the original seal in existing units without adjusting the design or replacing parts. It is also suitable for severely worn old shafts. Even if there is residual oil leakage in the original seal, it can be pumped back to the grease chamber through the spiral lip of this seal without special cleaning. Because the lip is multi-stage and uses polyurethane material with excellent wear resistance, it has good wear resistance and a significantly extended service life.
[0005] This utility model also provides a pump suction sealing device as described above, comprising: a back of a sealing body, a spiral lip fixedly connected to the outer surface of the back of the sealing body, a dustproof lip fixedly connected to the outer surface of the back of the sealing body, chamfers on both sides of the outer edge of the back of the sealing body, two protrusions on one side of the back of the sealing body, and a stepped edge on the other side of the back of the sealing body, which can prevent grease from leaking layer by layer, resulting in a good sealing effect and eliminating grease leakage from the main bearing; the multi-lip spiral design of this seal allows even a small amount of grease to leak into the middle, which can be pumped back to the grease chamber under the action of the spiral, preventing grease from leaking to the air side and achieving zero leakage; it can also directly replace the original seal in existing units without adjusting the design or replacing parts, and it is also applicable to severely worn old shafts. Even if there is residual oil leakage in the original seal, it can be pumped back to the grease chamber through the spiral lip of this seal without special cleaning; because the lip is multi-stage and uses polyurethane material with excellent wear resistance, it has good wear resistance and a significantly extended service life.
[0006] According to the pump suction sealing device provided by this utility model, the back of the sealing body, the spiral lip, the dustproof lip, and the protrusion are made of polyurethane. Polyurethane has good oil resistance, wear resistance, and high strength, and can provide a long service life. The number of spiral lips is specifically four.
[0007] According to the pump suction sealing device provided by this utility model, the back of the sealing body is installed on the sealing seat, and a pressure plate is fixedly connected to the outer surface of the sealing seat.
[0008] According to the pump suction sealing device provided by this utility model, the pressure plate is provided with bolts, and the pressure plate is fixedly connected to the sealing seat by bolts, which has the effect of improving stability.
[0009] According to the pump suction sealing device provided by this utility model, the spiral lip is connected to a rotating shaft, and the dustproof lip is in contact with the rotating shaft.
[0010] Beneficial effects
[0011] Compared with existing technologies, this pump suction sealing device can seal grease layer by layer, resulting in a good sealing effect and preventing grease leakage from the main bearing.
[0012] Compared with existing technologies, this pump suction sealing device features a multi-lip spiral design. Even if a small amount of grease leaks into the middle, it can be pumped back to the grease chamber under the action of the spiral, preventing grease from leaking to the air side and achieving zero leakage.
[0013] Compared with existing technologies, this pump suction sealing device can directly replace the original seal in existing units without adjusting the design or replacing parts. It is also suitable for severely worn old shafts. Even if there is residual oil leakage in the original seal, it can be pumped back to the grease chamber through the spiral lip of this seal without special cleaning.
[0014] Compared with existing technologies, this pump suction sealing device uses polyurethane material with excellent wear resistance because the lip is multi-stage backup, resulting in good wear resistance and a significantly extended service life. Attached Figure Description
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;
[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of the pump suction sealing device of this utility model;
[0017] Figure 2 This is a front view structural diagram of the pump suction sealing device of this utility model;
[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the pump suction sealing device of this utility model;
[0019] Figure 4 This is a schematic diagram of the installation structure of the pump suction sealing device of this utility model.
[0020] Legend:
[0021] 1. Back of the sealing body; 2. Spiral lip; 3. Dustproof lip; 4. Protrusion; 5. Pressure plate; 6. Sealing seat; 7. Rotating shaft; 8. Spiral groove. Detailed Implementation
[0022] 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.
[0023] Reference Figure 1 and Figure 2The pump suction sealing device of this utility model embodiment includes: a sealing body back 1 for providing support; a spiral lip 2 fixedly connected to the outer surface of the sealing body back 1 as the main sealing unit to prevent grease leakage; a dustproof lip 3 fixedly connected to the outer surface of the sealing body back 1 to prevent external dust from entering the grease chamber; chamfers on both sides of the outer edge of the sealing body back 1 for easy sealing installation; two protrusions 4 on one side of the sealing body back 1 to reduce the installation pressure of the pressure plate and indicate the orientation of the lip during installation; and a stepped edge on the other side of the sealing body back 1 for easy installation. The sealing body back 1, spiral lip 2, and dustproof lip 3 are made of polyurethane, which has good oil resistance, wear resistance, and high strength, and can provide a long service life. The number of spiral lips 2 is four.
[0024] Specifically, firstly, when the shaft rotates during operation, the grease is greatly reduced in probability due to the obstruction of the four spiral lips 2. Even if there is a slight leakage, it will be reintroduced into the grease chamber by the spiral lips 2 and will not continue to leak towards the air side. If there is a grease leakage between the second and third spiral lips 2, or between the first and second spiral lips 2, or between the third and fourth spiral lips 2, the grease will be guided back into the grease chamber along the spiral grooves as the shaft rotates, instead of leaking into the air side.
[0025] Reference Figure 3 and Figure 4 The back of the sealing body 1 is installed on the sealing seat 6. A pressure plate 5 is fixedly connected to the outer surface of the sealing seat 6. Bolts are provided on the pressure plate 5, and the pressure plate 5 is fixedly connected to the sealing seat 6 by the bolts. The spiral lip 2 is connected to the rotating shaft 7. The dustproof lip 3 is in contact with the rotating shaft 7. If there is grease leakage between the second and third grooves of the spiral lip 2, or between the first and second grooves, or between the third and fourth grooves, as the shaft rotates, the grease will be guided back to the grease chamber along the spiral grooves, instead of leaking to the air side.
[0026] Specifically, the seal is installed in the groove of the sealing seat 6 and pressed tightly on the outside by the pressure plate 5. The pressure plate 5 is connected to the sealing seat 6 by bolts. The spiral lip 2 of the seal faces the lubricating grease to prevent the grease from leaking to the air side, and the dustproof lip 3 faces the air to prevent impurities in the air from entering the lubricating grease.
[0027] Working principle: During installation, the seal is installed in the groove of the sealing seat 6 and pressed tightly on the outside by the pressure plate 5. The pressure plate 5 is connected to the sealing seat 6 by bolts. The spiral lip 2 of the seal faces the lubricating grease to prevent the grease from leaking to the air side, and the dust lip 3 faces the air to prevent impurities in the air from entering the lubricating grease. In the working state, when the shaft rotates, the grease will greatly reduce its leakage probability due to the obstruction of the four spiral lips 2. Occasionally, a small amount of leakage will be reintroduced into the grease chamber under the action of the spiral lips 2, and will not continue to leak towards the air side. If there is grease leakage between the second and third spiral lips 2, or between the first and second spiral lips, or between the third and fourth spiral lips 2, as the shaft rotates, the grease will be guided back into the grease chamber along the spiral groove, instead of leaking to the air side.
[0028] 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 pump suction sealing device, characterized in that, include: The back of the sealing body (1) is fixedly connected with a spiral lip (2) on the outer surface of the back of the sealing body (1), and a dustproof lip (3) is fixedly connected to the outer surface of the back of the sealing body (1). The outer edges of the back of the sealing body (1) are chamfered on both sides. Two protrusions (4) are provided on one side of the back of the sealing body (1), and the other side of the back of the sealing body (1) is a stepped edge.
2. The pump suction sealing device according to claim 1, characterized in that, The back of the sealing body (1), the spiral lip (2), the dustproof lip (3), and the protrusion (4) are made of polyurethane, and the number of the spiral lip (2) is four.
3. The pump suction sealing device according to claim 1, characterized in that, The back (1) of the sealing body is installed on the sealing seat (6), and a pressure plate (5) is fixedly connected to the outer surface of the sealing seat (6).
4. The pump suction sealing device according to claim 3, characterized in that, Bolts are provided on the pressure plate (5), and the pressure plate (5) is fixedly connected to the sealing seat (6) by the bolts.
5. The pump suction sealing device according to claim 1, characterized in that, The spiral lip (2) is connected to a rotating shaft (7), and the dustproof lip (3) is in contact with the rotating shaft (7).