Oil slinger structure for preventing oil leakage of wind power gear box
By designing an oil-shrinking ring and oil-blocking ring structure at the high-speed shaft of the wind power gear box, the annular protrusion and grooves are used to prevent oil leakage, and sealing is achieved through the oil return chamber and pipeline, the problem of lubricating oil and high-pressure oil mist leakage at the high-speed shaft of the wind power gear box is solved, the sealing effect is improved, and the maintenance difficulty and cost are reduced.
Patent Information
- Application Number
- CN202422259635.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The existing wind power gearbox has problems of lubricating oil and high-pressure oil mist seeping at the high-speed shaft, resulting in oil leakage failures, which are difficult to effectively solve in the existing technology.
A wind power gear box anti-oil oil-sliding oil ring structure is designed, including a sheathing ring and an oil-blocking ring at the journal of the high-speed shaft. The oil and oil mist are prevented from seeping out through the annular protrusion and groove structure, and the oil return chamber and oil return pipeline are set up, and the seal is achieved using the principle of interference fit and reverse oil-sliding.
It effectively prevents lubricating oil and high-pressure oil mist from seeping out from the high-speed shaft during high-speed rotation, improves the sealing effect, avoids oil leakage failure of gearbox, and reduces maintenance costs and complexity.
Smart Images
Figure CN223063109U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of wind power gearboxes, and particularly to a slinger structure for preventing oil leakage of a wind power gearbox. Background Art
[0002] Judging from the installation time of wind power gearboxes in China, most gearboxes are about to enter or have already entered the stage of needing repair or maintenance. And regarding the problem of oil slinging at the high-speed shaft, it has always been a technical difficulty in the industry.
[0003] Taking a certain model served by our company as an example, the gearboxes of this series have undergone several version updates. Each update will make design changes on the motor side of the high-speed shaft, and the number of changes has reached 10 times. The labyrinth design has become more and more complex. It can be seen that the problem of oil leakage at the high-speed shaft has brought a serious burden to the design and after-sales work.
[0004] Generally, a mechanical labyrinth method is adopted between the through cover of the high-speed shaft of the wind power gearbox and the shaft diameter to form a set of oil retaining, oil slinging, and oil returning devices.
[0005] The key points of each upgrade often include the following aspects: 1. Increasing the number of labyrinths; 2. Adding seals; 3. Increasing the difficulty of the labyrinth. Increasing the number of labyrinths often requires a large space support, and the added seals are likely to fail in the future. Once they fail, it will bring difficulties and frequencies of maintenance to after-sales. The increase in the difficulty of the labyrinth will lead to an increase in processing costs and cause an increase in maintenance costs.
[0006] Such as Figure 1 、 2 、3 list typical design methods of the prior art:
[0007] In the early stage, most gearboxes adopted Figure 1 a single oil slinging and V-shaped seal method (Prior Art 1), Figure 2 After the structural infrastructure in Figure 1 was changed, an outer slinger was added (Prior Art 2). In this way, more or less oil slinging phenomenon exists in many gearboxes.
[0008] Figure 3 Increasing the difficulty of the labyrinth and adding a breathable line to increase the top air permeability (Prior Art 3) have improved the oil leakage condition to a certain extent, but at the same time, it has also increased the maintenance cost and failure rate. According to statistics, in the 4MW model, more than 10 cases of through cover burning have been reported. The reason is that this kind of labyrinth relies on the gap control between the through cover and the step to achieve oil slinging. Once the high-speed shaft moves axially, the gap of about 1mm will be quickly eaten up, which will cause friction between the slinger and the through cover, resulting in the failure of the shafting.
[0009] In the prior art, a T-shaped slinger is also fixedly sleeved at the shaft neck of the high-speed shaft. The slinging structure formed by the T-shaped slinger and the through cover oil return structure has greatly improved the oil leakage condition of the high-speed shaft.
[0010] However, during the operation of a wind power gearbox, the rotational speed of the high-speed shaft is relatively high, and the internal air pressure of the gearbox is relatively high. In addition to liquid lubricating oil, there is also high-pressure oil mist. The current T-shaped oil slinger structure cannot completely prevent the overflow of oil mist and needs further improvement. Summary of the Invention
[0011] The utility model provides an oil slinger structure for preventing oil leakage in a wind power gearbox, aiming to solve the shortcomings of the prior art and avoid the leakage of lubricating oil and high-pressure oil mist from the high-speed shaft during the high-speed rotation of the high-speed shaft of the gearbox, thereby causing oil leakage faults in the gearbox.
[0012] The technical solution adopted by the utility model to solve its technical problems is as follows:
[0013] An oil slinger structure for preventing oil leakage in a wind power gearbox, the high-speed shaft of the wind power gearbox passes through the through-hole of the through cover, and the through cover is fixedly connected to the box body; characterized in that:
[0014] An oil slinger is fixedly sleeved on the journal of the high-speed shaft. The oil slinger includes a main body fixedly sleeved on the journal of the high-speed shaft. An annular convex ridge I is provided on the main body, and an annular outer retaining ring extends axially outward at the outer end of the annular convex ridge I;
[0015] An oil retaining ring is sleeved between the oil slinger and the box body;
[0016] A first oil return cavity is formed by the inner side of the annular convex ridge I of the oil slinger, the oil retaining ring, and the through cover. A second oil return cavity is formed by the outer side of the annular convex ridge I of the oil slinger, the annular outer retaining ring of the oil slinger, and the through cover;
[0017] The through cover is provided with an annular groove facing the second oil return cavity;
[0018] There is an oil return pipeline in the box body and the through cover that is connected to the first oil return cavity.
[0019] Two or more annular convex ridges II with a triangular cross-section are provided on the outer wall of the outer retaining ring. The included angle between the inner side of the triangle and the outer wall of the outer retaining ring is an acute angle, and the included angle between the outer side of the triangle and the outer wall of the outer retaining ring is an obtuse angle. An annular groove is formed between adjacent triangular annular convex ridges II.
[0020] The main body of the oil slinger is in interference fit with the journal of the high-speed shaft.
[0021] There are two or more annular grooves.
[0022] The beneficial effects of the utility model are as follows:
[0023] Simple and practical structure; improve the sealing effect of the high-speed stage; a groove structure is designed between the oil slinger and the through cover, and it is opposite to the flow direction of the oil / oil mist overflowing outward, which can prevent the oil / oil mist from leaking out from the high-speed shaft during the operation of the gearbox, and the gearbox from having an oil leakage failure. Description of the Drawings
[0024] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0025] Figure 1 It is a cross-sectional view of the prior art 1;
[0026] Figure 2 It is a cross-sectional view of the prior art 2;
[0027] Figure 3 It is a cross-sectional view of the prior art 3;
[0028] Figure 4 It is a cross-sectional view of the present utility model;
[0029] Figure 5 It is Figure 4 An enlarged view of part D of Detailed Description of the Preferred Embodiment
[0030] In order to more clearly illustrate the technical solutions of the present utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other embodiments can be obtained based on these drawings. To facilitate the understanding of the present utility model, the present utility model will be described in more detail below in conjunction with the drawings and specific embodiments.
[0031] It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "upper", "lower", "inner", "outer", "bottom", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, 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, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0032] As Figure 4 、 Figure 5 shown:
[0033] The high-speed shaft 7 of the wind power gearbox passes through the through-hole of the through cover 2, and the through cover 2 is fixedly connected to the box body 1.
[0034] An oil slinger 4 is sleeved on the journal of the high-speed shaft 2 by interference fit. The oil slinger 4 includes a main body 41 sleeved on the journal of the high-speed shaft 2 by interference fit. An annular convex ridge I 42 is provided on the main body 41, and an annular outer retaining ring 43 extends axially outward at the outer end of the annular convex ridge I 42.
[0035] Two or more annular convex ridges II 44 with a triangular cross-section are provided on the outer wall of the outer retaining ring 43. The cross-section of the annular convex ridge II 44 is triangular. The angle H between the inner side of the triangle and the outer wall of the outer retaining ring 43 is an acute angle, and the angle I between the outer side of the triangle and the outer wall of the outer retaining ring 43 is an obtuse angle. That is, the triangle inclines towards the inside of the box body 1, and the apex angle of the triangle faces the inside of the box body 1. Annular grooves E are formed between adjacent triangular annular convex ridges II 44, and there are two or more annular grooves E.
[0036] An oil baffle ring 3 is sleeved between the oil slinger 4 and the box body 1.
[0037] A first oil return cavity 234 is formed by the inner side of the annular convex ridge I 42 of the oil slinger 4, the oil baffle ring 3, and the through cover 2. A second oil return cavity 24 is formed by the outer side of the annular convex ridge I 42 of the oil slinger 4, the annular outer retaining ring 43 of the oil slinger 4, and the through cover 2.
[0038] The through cover 2 is provided with an annular groove 21 facing the second oil return cavity 24.
[0039] An oil return pipeline 6 connected to the first oil return cavity 234 is provided in the box body 1 and the through cover 2.
[0040] Oil return principle:
[0041] The arrows in the figure represent the flow directions of lubricating oil and high-pressure oil mist.
[0042] Figure 4 、 Figure 5 The left side of 、 is the inside of the box body 1. The lubricating oil is internal lubricating oil. Part of the lubricating oil and high-pressure oil mist overflow outward through the gaps between the oil baffle ring 3 and the oil slinger 4 (including two gaps: the gap A between the oil baffle ring 3 and the main body 41 of the oil slinger 4, and the gap B between the outer end face of the oil baffle ring 3 and the annular convex ridge I 42 of the oil slinger 4) and enter the first oil return cavity 234.
[0043] The oil slinger 4 and the journal of the high-speed shaft 7 are connected by interference fit. During operation, as the high-speed shaft 7 rotates, the purpose of oil slinging is achieved. Other components are connected to the box body 1 and are in a static state.
[0044] The oil return line E utilizes the principle of reverse oil slinging by the oil slinger ring to sling most of the lubricating oil in the first oil return cavity 234 in the reverse direction, splashing it onto the surface of the oil baffle ring 4, and finally flowing along the surface of the oil baffle ring 4 to the oil return pipeline 6 opened in the through cover 2 and returning to the inside of the housing 1.
[0045] A small portion of the lubricating oil and high-pressure oil mist that are not completely processed by the oil return line E enter the second oil return cavity 24 through the gap C between the outer ring surface of the annular outer baffle ring 43 of the oil baffle ring 4 and the through cover 2.
[0046] The oil return line F distributes the lubricating oil and high-pressure oil mist in these second oil return cavities 24 to the oil return ring groove 21 in the through cover 2, and then flows along the oil return ring groove 21, the inner wall of the through cover 2, the gap C between the outer ring surface of the outer baffle ring 43 and the through cover 2, and the first oil return cavity 234 to the oil return pipeline 6 opened in the through cover 2 and returns to the inside of the housing 1.
[0047] During the process that a small portion of the lubricating oil and high-pressure oil mist that are not completely processed by the oil return line E enter the second oil return cavity 24 through the gap C between the outer ring surface of the annular outer baffle ring 43 and the through cover 2, they will be blocked by the annular convexity two 44 with a triangular cross-section between the outer ring surface of the outer baffle ring 43 and the through cover 2. Since the triangle inclines towards the inside of the housing 1 and the apex angle of the triangle faces the inside of the housing 1, the lubricating oil and high-pressure oil mist will decelerate and fall into the annular groove E formed between the adjacent triangular annular convexities two 44. Especially for the high-pressure oil mist, after decelerating, it becomes liquid and will not continue to leak out of the second oil return cavity 24 due to the high-pressure aerosol state.
[0048] In the oil return line F, when the lubricating oil and high-pressure oil mist pass through the gap C between the outer ring surface of the annular outer baffle ring 43 and the through cover 2, they will not be blocked because the sharp angle of the triangular annular convexity two 44 is in the reverse direction of the path.
[0049] Based on the analysis of the possible causes of oil leakage, this patent innovatively designs an oil slinger ring plus through cover oil return structure, successfully solving the problem of oil slinging at the high-speed shaft of batch wind power gearboxes.
[0050] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An oil slinger structure for preventing oil leakage in a wind power gearbox, where the high-speed shaft of the wind power gearbox passes through the through-hole of the through-cover, and the through-cover is fixedly connected to the box body; characterized in that: An oil slinger is fixedly sleeved on the journal of the high-speed shaft. The oil slinger includes a main body fixedly sleeved on the journal of the high-speed shaft. An annular convex wall I is provided on the main body, and an annular outer retaining ring extends axially outward at the outer end of the annular convex wall I; An oil baffle ring is sleeved between the oil slinger and the box body; The inner side of the annular convex wall I of the oil slinger, the oil baffle ring, and the through cover enclose a first oil return cavity, and the outer side of the annular convex wall I of the oil slinger, the annular outer retaining ring of the oil slinger, and the through cover enclose a second oil return cavity; The through cover is provided with an annular groove facing the second oil return cavity; There is an oil return pipeline in the box body and the through cover that is connected to the first oil return cavity; The outer wall of the outer retaining ring is provided with two or more annular convex walls II with a triangular cross-section. The included angle between the inner side of the triangle and the outer wall of the outer retaining ring is an acute angle, and the included angle between the outer side of the triangle and the outer wall of the outer retaining ring is an obtuse angle. An annular groove is formed between adjacent triangular annular convex walls II.
2. The oil slinger structure for preventing oil leakage of a wind power gearbox according to claim 1, wherein: The main body of the oil slinger is interference-fitted on the journal of the high-speed shaft.