Bearing sealing structure of hover fan

Abstract

The invention provides a bearing sealing structure of a hover fan. The bearing sealing structure is a configuration combination of a fixed end and a floating end, and specifically comprises a fan main shaft, a bearing, a waterproof cover, an end cover, an oil seal, a pressing plate and a bearing retainer ring, most seawater is blocked through the waterproof cover, the seawater is discharged through a water throwing structure of the bearing check ring, and the end cover and the pressing plate are matched with the oil seal to play a role in preventing a small amount of residual seawater from permeating into the fan main bearing; compared with a sealing packing structure in the prior art, the bearing sealing structure adopting the lip-shaped oil seal has the advantages of better sealing performance, automatic compensation capability, reduction of abrasion to a shaft, small frictional resistance, low energy consumption, high durability and the like. The influence of adverse environmental conditions on the sealing performance of the fan main bearing is reduced, the operation problem of the fan main bearing due to the adverse environmental conditions is avoided, and the service life of the fan main bearing is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cushion-lift fans, and in particular to a bearing sealing structure of a cushion-lift fan. Background Art

[0002] The axial-flow lift fan is a key equipment of the ship lift system, which is used to provide the lift system with the air flow and pressure head required for the hull lift. Its performance is closely related to the lift performance of the lift ship, which in turn affects other overall performances of the hovercraft, such as stability and speed. The fan main bearing is an important component of the lift fan. The fan main bearing provides radial support, bearing the deadweight of the impeller assembly, the weight of part of the diaphragm coupling, and the load under the acceleration alternating load and vibration excitation of the boat. At the same time, it has the ability to withstand a certain axial alternating load to ensure the smooth operation of the impeller assembly.

[0003] When the hovercraft is in operation, the open-air working environment is subject to alternating dry and wet, alternating scouring by water mist and dust, alternating scouring by high temperature exposure and low temperature seawater, accompanied by adverse environmental conditions such as tilting and swaying, inertial overload, and continuous high-frequency vibration. These will affect the sealing of the main bearing of the fan in the cushion lift fan and cause problems in the operation of the fan main bearing. Summary of the invention

[0004] In view of the technical problems raised in the above background technology, the present invention provides a bearing sealing structure for a cushion-lift fan.

[0005] The present invention solves the above technical problems through the following technical solutions: In a first aspect, the present invention provides a bearing sealing structure for a cushion-lift fan. The bearing sealing structure comprises: a fan main shaft, a bearing is arranged on one side of the fan main shaft, end covers are respectively installed at both ends of the bearing, a rotating shaft is arranged on the bearing, an oil seal is installed on the rotating shaft, and the end cover is assembled with the oil seal; a pressure plate is arranged on the outer side of the end cover, and the pressure plate is fixed to the end cover by a bolt structure.

[0006] Preferably, the bearing sealing structure further includes a bearing seat, an oil cup, and a waterproof cover. The bearing seat is arranged on the outer side of the bearing, and the oil cup is arranged on the bearing seat; The waterproof covers are respectively mounted on the end covers at both sides.

[0007] Preferably, the bearing is arranged on the fan main shaft via a bearing retaining ring.

[0008] Preferably, the bearing is a self-aligning bearing.

[0009] Preferably, the pressing plate is a split structure.

[0010] Preferably, the oil seal is a lip-shaped oil seal, and the lip-shaped oil seal is made of rubber and rubber-cloth sandwich material.

[0011] The positive progressive effect of the present invention is that the present invention provides a bearing sealing structure for a pad-lift wind turbine. The bearing sealing structure is a configuration combination of a fixed end and a floating end, specifically including a wind turbine main shaft, a bearing, a waterproof cover, an end cover, an oil seal, a pressure plate and a bearing retaining ring; most of the seawater is blocked by the waterproof cover, and the water-throwing structure of the bearing retaining ring discharges the seawater. The end cover, the pressure plate and the oil seal cooperate to prevent the remaining small amount of seawater from penetrating into the main bearing of the wind turbine; the bearing sealing structure using a lip-shaped oil seal of the present invention has better sealing performance, automatic compensation ability, reduced wear on the shaft, low friction resistance, low energy consumption, and high durability compared to the sealing packing structure of the prior art. Reduce the impact of adverse environmental conditions on the sealing of the main bearing of the wind turbine, avoid operating problems of the main bearing of the wind turbine due to adverse environmental conditions, and increase the service life of the main bearing of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic plan view of the bearing sealing structure of the lift fan according to Example 1 of the present invention.

[0013] Legend: 1. Fan main shaft; 2. Bearing; 3. End cover; 4. Oil seal; 5. Pressure plate; 6. Bolt structure; 7. Bearing seat; 8. Bearing retaining ring; 9. Oil cup; 10. Waterproof cover. DETAILED DESCRIPTION

[0014] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0015] Example 1 like Figure 1As shown, this embodiment provides a bearing sealing structure for a cushion-lifting fan. The bearing sealing structure includes: a fan main shaft 1, a bearing 2, an end cover 3, an oil seal 4, a pressure plate 5, a bolt structure 6, a bearing seat 7, a bearing retaining ring 8, an oil cup 9, and a waterproof cover 10. A bearing 2 is arranged on one side of the fan main shaft 1, and end covers 3 are respectively installed at both ends of the bearing 2. A rotating shaft is arranged on the bearing 2, and an oil seal 4 is installed on the rotating shaft. The end cover 3 and the oil seal 4 are assembled; a pressure plate 5 is arranged on the outer side of the end cover 3, and the pressure plate 5 is fixed on the end cover 3 through a bolt structure 6. The bearing seat 7 is arranged on the outer side of the bearing 2, and the bearing 2 is arranged on the fan main shaft 1 through a bearing retaining ring 8; wherein the bearing 2 is a self-aligning bearing. The bearing seal structure of the cushion-lift fan is a combination of a fixed end and a floating end, and the fixed end and the floating end are distinguished by the gap between the end cover 3 and the outer ring of the bearing 2; the fan main shaft 1 is an important component of the cushion-lift fan, mainly used for power transmission to drive the fan impeller to work; the fan main shaft 1 is made of 35CrMoA alloy steel material, and the fan main shaft 1 is designed as a hollow stepped shaft to ensure the power transmission and mechanical strength requirements of the fan main shaft 1 and reduce its own weight.

[0016] As an optional embodiment, the pressure plate 5 is a split structure. In order to facilitate the subsequent disassembly, maintenance, and installation after repair of the fan bearing 1, the pressure plate 5 is designed as a split structure. In order to achieve the sealing effect, the pressure plate 5 needs to cooperate with the end cover to apply sufficient axial pressure to the shoulder of the oil seal 4. The thickness of the pressure plate 5 is 7mm, and the installation distribution circle diameter is 237mm.

[0017] As an optional embodiment, the oil seal 4 is a frameless seal made of rubber and rubber-cloth material. When the oil seal 4 is installed on the rotating shaft, the lip of the oil seal 4 needs to face inward to prevent the lubricating grease in the bearing 2 from flowing out and to prevent external impurities from entering the bearing 2, thereby achieving a sealing effect.

[0018] In this embodiment, the oil seal 4 is a lip-shaped oil seal. When the lip-shaped oil seal is installed on the rotating shaft, there is a certain amount of interference between the lip of the lip-shaped oil seal and the rotating shaft, so that the lip has generated an initial contact pressure on the rotating shaft without external pressure. This contact pressure is the basis for achieving sealing, and can prevent lubricating oil or other media from leaking from the gap between the rotating shaft and the lip-shaped oil seal under static conditions. When the rotating shaft starts to rotate, the relative movement between the lip and the rotating shaft causes a thin layer of fluid dynamic pressure oil film to form in the gap between the two; the thickness of this oil film is 0.0025mm. In addition, the lip-shaped oil seal is usually used in conjunction with a spring, which provides continuous pressure to the lip to ensure that the lip is always in close contact with the rotating shaft. Even if the contact pressure between the lip and the shaft changes due to various factors during the rotation of the rotating shaft, the spring can timely adjust the pressure of the lip to keep it within a suitable range, thereby ensuring the sealing effect. The lip of the lip oil seal has a certain elasticity and deformation ability. During the rotation of the rotating shaft, the shaft may have a certain degree of eccentricity, out-of-roundness or vibration, but the lip can adapt to these changes through its own deformation and always maintain a close fit with the shaft. When the lip is worn, due to its elasticity and deformation ability, the lip can still maintain contact with the shaft to a certain extent, thus having a certain automatic compensation ability and extending the service life of the oil seal.

[0019] As an optional embodiment, the oil cup 9 is arranged on the bearing seat 7; the lift fan needs to be filled with grease through the oil cup 9, and the grease is MULTITOP (L135V) series grease.

[0020] As an optional embodiment, the waterproof cover 10 is respectively installed on the end covers 3 on both sides; the waterproof cover 10 cooperates with the bearing retaining ring and the water-slinging ring to effectively reduce the infiltration of seawater without affecting other bearing sealing structures.

[0021] In the present embodiment, a bearing sealing structure of a cushion-lift fan is provided. The bearing sealing structure of the cushion-lift fan is a configuration combination of a fixed end and a floating end, and specifically includes a fan main shaft, a bearing, a waterproof cover, an end cover, an oil seal, a pressure plate, and a bearing retaining ring; most of the seawater is blocked by the waterproof cover, and the water-throwing structure of the bearing retaining ring discharges the seawater. The end cover, the pressure plate and the oil seal cooperate to prevent the remaining small amount of seawater from penetrating into the main bearing of the fan; the bearing sealing structure using a lip-shaped oil seal of the present invention has the advantages of better sealing performance, automatic compensation ability, reduced wear on the shaft, low friction resistance, low energy consumption, and high durability compared to the sealing packing structure of the prior art. Reduce the impact of adverse environmental conditions on the sealing of the fan main bearing, avoid operating problems of the fan main bearing due to adverse environmental conditions, and increase the service life of the fan main bearing.

[0022] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A bearing sealing structure for a cushion-lift fan, characterized in that: The bearing sealing structure includes: a fan main shaft, a bearing is arranged on one side of the fan main shaft, end covers are respectively installed at both ends of the bearing, a rotating shaft is arranged on the bearing, an oil seal is installed on the rotating shaft, and the end cover is matched with the oil seal; a pressure plate is arranged on the outer side of the end cover, and the pressure plate is fixed to the end cover by a bolt structure.

2. The bearing sealing structure of the cushion-lift fan according to claim 1, characterized in that: The bearing sealing structure also includes a bearing seat, an oil cup, and a waterproof cover. The bearing seat is arranged on the outer side of the bearing, and the oil cup is arranged on the bearing seat; The waterproof covers are respectively mounted on the end covers at both sides.

3. The bearing sealing structure of the pad lift fan according to claim 2, characterized in that: The bearing is arranged on the fan main shaft through a bearing retaining ring.

4. The bearing sealing structure of the cushion-lift fan according to claim 3, characterized in that: The bearing is a self-aligning bearing.

5. The bearing sealing structure of the cushion-lift fan according to claim 1, characterized in that: The pressing plate is a split structure.

6. The bearing sealing structure of the cushion-lift fan according to claim 1, characterized in that: The oil seal is a lip-shaped oil seal, and the lip-shaped oil seal is made of rubber and rubber-cloth sandwich material.

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