Sealing structure of wind power deflection bearing

Abstract

The utility model provides a wind power deflection bearing sealing structure which comprises a first bearing ring, a second bearing ring and a sealing structure, and the sealing structure is arranged between the first bearing ring and the second bearing ring. The sealing structure is a double sealing ring consisting of an inner sealing ring and an outer sealing ring; the inner sealing ring is of a double-lip type sealing structure. The outer sealing ring can prevent the inner sealing ring from being directly exposed in the environment, invasion of soil, dust and sand is avoided, the aging progress of the sealing ring is slowed down, and the service life of the sealing ring is prolonged; the outer seal can improve the sealing performance of the bearing, guarantee the stock of lubricating grease in the bearing, improve the operation stability of the bearing and reduce the maintenance cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearings, in particular to a wind power deflection variable bearing sealing structure. Background Art

[0002] With the rapid development of the wind power industry, more and more large-megawatt units have begun to occupy the market, and the requirements for each subsystem are naturally higher. For wind turbines, the variable pitch bearing, as a core component, directly affects the operating stability of the entire system. The seal of the bearing plays a role in isolating the external environment from the internal environment of the bearing, and prevents grease leakage, ensuring that the internal grease is not leaked and damaged, and plays a good role in bearing lubrication. Given that the life of the wind turbine is generally up to about 25 years, the operating environment of the wind turbine is usually very bad. The life of the seal on the market is generally about 3 years. Such conditions not only affect the seals but also have a serious impact on the normal operation of the entire wind turbine system. At the least, it will cause difficulties in system maintenance and a sharp increase in costs. In severe cases, the system will stop running, causing direct economic losses. The failure of the variable pitch bearing seal will not only cause grease leakage, which will directly affect the bearing lubrication effect, but also once the leakage is not effectively controlled, it will cause changes in the internal lubrication elements and cause poor bearing operation. In addition, once the grease leaks to the outside world, it will also pollute the environment, which runs counter to the clean energy of wind power generation.

[0003] There are many types of seals available for bearing sealing, but they are mainly improved in terms of interference fit and interface. However, no matter how the shape of a single seal is changed, it is inevitably in direct contact with the harsh environment of the outside world, and there is no good solution to the erosion problem of the seal. The increase in sealing grooves aggravates the wear of the seal, and there is little effect on improving the grease leakage problem, and these two problems cannot be fundamentally solved. Utility Model Content

[0004] In view of the above problems, the purpose of this application is to design a wind turbine bearing sealing structure that can be used in various harsh environments, resist the erosion of ozone, ultraviolet rays, salt water, etc., and effectively improve the problems of grease leakage and aging and deterioration of the sealing ring.

[0005] To achieve some or all of the above-mentioned purposes or other purposes, the present application provides the following technical solutions: a wind power deflection bearing sealing structure, comprising a first bearing ring, a second bearing ring and a sealing structure, the sealing structure being arranged between the first bearing ring and the second bearing ring, the sealing structure being a double sealing ring consisting of an inner sealing ring and an outer sealing ring; the inner sealing ring is a double-lip sealing structure; a first lip and a second lip are arranged on the inner sealing ring, the first lip and the second lip are both sealed with the second bearing ring, the first lip is sealed with a radial interference fit with the end face of the second bearing ring, and the second lip is sealed with an axial interference fit with the circumferential surface of the second bearing ring.

[0006] Furthermore, the outer sealing ring mounting surface contacts the outer diameter of the first bearing ring, and an outer sealing ring connector is arranged on the outer sealing ring mounting surface, and the outer sealing ring connector is connected and matched with the outer sealing connecting groove of the first bearing ring; a third lip is arranged on the outer sealing ring, and the third lip cooperates and seals with the second bearing ring.

[0007] Furthermore, a retaining groove is arranged on the circumferential surface of the second bearing ring, and the second lip is interference fit with the inner wall of the retaining groove; an annular groove is arranged on the end surface of the second bearing ring close to the side of the first bearing ring, the first lip is installed in the annular groove, and the third lip is arranged outside the annular groove.

[0008] Furthermore, the third lip is radially interference fit sealed with the end face of the second bearing ring, a plurality of barbs are arranged on the outer surface of the outer sealing ring connector, and the barbs are interference fit sealed with the outer sealing connecting groove; the outer sealing ring mounting surface is interference fit sealed with the outer diameter of the first bearing ring.

[0009] Furthermore, the inner sealing ring mounting surface contacts the outer diameter of the first bearing ring, and an inner sealing ring connector is arranged on the inner sealing ring mounting surface, and the inner sealing ring connector is connected and matched with the inner sealing connecting groove of the first bearing ring; a convex ring is arranged on the outer surface of the inner sealing ring connector, and the convex ring is interference fit and sealed with the inner sealing connecting groove; the inner sealing ring mounting surface is interference fit and sealed with the outer diameter of the first bearing ring.

[0010] Further, the first bearing ring is the inner ring of the bearing, the second bearing ring is the outer ring of the bearing, the sealing structure is installed on the inner ring of the bearing, the outer diameter of the inner ring of the bearing is the sealing diameter, the inner sealing connecting groove and the outer sealing connecting groove are arranged on the outer diameter of the inner ring of the bearing, the inner sealing ring connector is matched and connected with the inner sealing connecting groove of the outer diameter of the inner ring of the bearing, the outer sealing ring connector is matched and connected with the outer sealing connecting groove of the outer diameter of the inner ring of the bearing, the first lip of the inner sealing ring is matched with the end face of the outer ring of the bearing, and the second lip is matched with the inner diameter surface of the outer ring of the bearing.

[0011] Further, the first bearing ring is the bearing outer ring, the second bearing ring is the bearing inner ring, the sealing structure is installed on the bearing outer ring, the inner diameter of the bearing outer ring is the sealing diameter, the inner sealing connecting groove and the outer sealing connecting groove are arranged on the inner diameter of the bearing outer ring, the inner sealing ring connector is matched and connected with the inner sealing connecting groove of the inner diameter of the bearing outer ring, the outer sealing ring connector is matched and connected with the outer sealing connecting groove of the inner diameter of the bearing outer ring, the first lip of the inner sealing ring is matched with the end face of the bearing inner ring, and the second lip is matched with the inner diameter surface of the bearing inner ring.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the sealing structure of the utility model is a double sealing ring composed of an inner sealing ring and an outer sealing ring; the outer sealing ring can prevent the inner seal from being directly exposed to the environment, protect it from the invasion of dirt and dust, slow down the aging progress of the sealing ring, and increase the service life of the sealing ring; the outer seal can increase the sealing performance of the bearing, reduce the possibility of grease leakage from a single seal, ensure the amount of grease inside the bearing, improve the operating stability of the bearing, and reduce maintenance costs; generally, the load on the eccentric bearing is large and the speed is low, and there are certain requirements for the bearing seal positioning and torque. The sealing position and spacing of the utility model can be flexibly adapted to the specific size of the bearing and the environmental needs to meet different conditions; the utility model can select the most suitable main parameters according to the bearing size and blade root size, and finally position the seal ring to verify the design scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the sealing structure installed on the bearing;

[0014] Figure 2 It is an enlarged schematic diagram of point A in Example 1;

[0015] Figure 3 It is an enlarged schematic diagram of point B in Example 2;

[0016] In the figure, 1 is the inner ring of the bearing; 2 is the outer ring of the bearing; 3 is the inner sealing ring; 4 is the first lip; 5 is the second lip; 6 is the inner sealing ring mounting surface; 7 is the inner sealing ring connector; 8 is the inner sealing connecting groove; 9 is the outer sealing ring; 10 is the third lip; 11 is the outer sealing ring mounting surface; 12 is the outer sealing ring connector; 13 is the outer sealing connecting groove; 14 is the retaining groove; 15 is the ring groove. DETAILED DESCRIPTION

[0017] In order to make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0018] Example 1

[0019] See attached Figure 1 and 2A wind power deflection bearing sealing structure comprises a first bearing ring, a second bearing ring and a sealing structure, wherein the sealing structure is arranged between the first bearing ring and the second bearing ring, and the sealing structure is a double sealing ring composed of an inner sealing ring 3 and an outer sealing ring 9; the inner sealing ring 3 is a double-lip sealing structure; a first lip 4 and a second lip 5 are arranged on the inner sealing ring 3, and the first lip 4 and the second lip 5 are both sealed with the second bearing ring, the first lip 4 and the end face of the second bearing ring are radially interfered with each other, and the second lip 5 and the circumferential surface of the second bearing ring are axially interfered with each other; the sealing ring structure is made of nitrile rubber, and with the double sealing structure, the destruction of ozone can be delayed.

[0020] Furthermore, the outer sealing ring mounting surface 11 contacts the outer diameter of the first bearing ring, and an outer sealing ring connector 12 is provided on the outer sealing ring mounting surface 11, and the outer sealing ring connector 12 is connected and matched with the outer sealing connecting groove 13 of the first bearing ring; a third lip 10 is provided on the outer sealing ring 9, and the third lip 10 cooperates and seals with the second bearing ring.

[0021] Furthermore, a retaining groove 14 is provided on the circumferential surface of the second bearing ring, and the second lip 5 is interference fit with the inner wall of the retaining groove 14; an annular groove 15 is provided on the end surface of the second bearing ring close to the side of the first bearing ring, the first lip 4 is installed in the annular groove 15, and the third lip 10 is arranged outside the annular groove 15; the retaining groove 14 and the annular groove 15 are designed to be set when forging, which can control the interference of the sealing ring and avoid excessive starting torque of the bearing due to excessive sealing, which affects the overall performance of the fan. In this way, the sealing performance of the bearing can be ensured while the starting torque is within a reasonable range, which is also convenient for the bearing manufacturer to test before delivery; the design of the annular groove 15 facilitates the subsequent replacement of the inner sealing ring 3; the retaining groove 14 facilitates the radial matching and positioning of the sealing structure, and the second lip 5 cooperates with the retaining groove 14 to prevent internal grease leakage.

[0022] Furthermore, the third lip 10 is radially interference fit sealed with the end face of the second bearing ring, and the outer surface of the outer sealing ring connector 12 is provided with a plurality of barbs, which are interference fit sealed with the outer sealing connecting groove 13; the outer sealing ring mounting surface 11 is interference fit sealed with the outer diameter of the first bearing ring; the barb structure facilitates the assembly of the sealing ring and can effectively prevent the sealing ring from moving outward, and this slot structure effectively ensures the firmness of the sealing ring installation.

[0023] Furthermore, the inner sealing ring mounting surface 6 is in contact with the outer diameter of the first bearing ring, and an inner sealing ring connector 7 is arranged on the inner sealing ring mounting surface 6, and the inner sealing ring connector 7 is connected and matched with the inner sealing connecting groove 8 of the first bearing ring; a convex ring is arranged on the outer surface of the inner sealing ring connector 7, and the convex ring is sealed by an interference fit with the inner sealing connecting groove 8; the inner sealing ring mounting surface 6 is sealed by an interference fit with the outer diameter of the first bearing ring.

[0024] Further, the first bearing ring is the bearing inner ring 1, the second bearing ring is the bearing outer ring 2, the sealing structure is installed on the bearing inner ring 1, the outer diameter of the bearing inner ring 1 is the sealing diameter, the inner sealing connecting groove 8 and the outer sealing connecting groove 13 are arranged on the outer diameter of the bearing inner ring 1, the inner sealing ring connector 7 is matched with the inner sealing connecting groove 8 of the outer diameter of the bearing inner ring 1, the outer sealing ring connector 12 is matched with the outer sealing connecting groove 13 of the outer diameter of the bearing inner ring 1, the first lip 4 of the inner sealing ring 3 is matched with the end face of the bearing outer ring 2, and the second lip 5 is matched with the inner diameter surface of the bearing outer ring 2.

[0025] Example 2

[0026] See attached Figure 1 and 3 A wind power deflection bearing sealing structure comprises a first bearing ring, a second bearing ring and a sealing structure, wherein the sealing structure is arranged between the first bearing ring and the second bearing ring, and the sealing structure is a double sealing ring composed of an inner sealing ring 3 and an outer sealing ring 9; the inner sealing ring 3 is a double-lip sealing structure; a first lip 4 and a second lip 5 are arranged on the inner sealing ring 3, and the first lip 4 and the second lip 5 are both sealed with the second bearing ring, the first lip 4 and the end face of the second bearing ring are radially interfered with each other, and the second lip 5 and the circumferential surface of the second bearing ring are axially interfered with each other.

[0027] Furthermore, the outer sealing ring mounting surface 11 contacts the outer diameter of the first bearing ring, and an outer sealing ring connector 12 is provided on the outer sealing ring mounting surface 11, and the outer sealing ring connector 12 is connected and matched with the outer sealing connecting groove 13 of the first bearing ring; a third lip 10 is provided on the outer sealing ring 9, and the third lip 10 cooperates and seals with the second bearing ring.

[0028] Furthermore, a retaining groove 14 is provided on the circumferential surface of the second bearing ring, and the second lip 5 is interference fit with the inner wall of the retaining groove 14; an annular groove 15 is provided on the end surface of the second bearing ring close to the side of the first bearing ring, the first lip 4 is installed in the annular groove 15, and the third lip 10 is installed outside the annular groove 15.

[0029] Furthermore, the third lip 10 is radially interference fit sealed with the end face of the second bearing ring, the outer surface of the outer sealing ring connector 12 is provided with a plurality of barbs, and the barbs are interference fit sealed with the outer sealing connecting groove 13; the outer sealing ring mounting surface 11 is interference fit sealed with the outer diameter of the first bearing ring.

[0030] Furthermore, the inner sealing ring mounting surface 6 is in contact with the outer diameter of the first bearing ring, and an inner sealing ring connector 7 is arranged on the inner sealing ring mounting surface 6, and the inner sealing ring connector 7 is connected and matched with the inner sealing connecting groove 8 of the first bearing ring; a convex ring is arranged on the outer surface of the inner sealing ring connector 7, and the convex ring is sealed by an interference fit with the inner sealing connecting groove 8; the inner sealing ring mounting surface 6 is sealed by an interference fit with the outer diameter of the first bearing ring.

[0031] Further, the first bearing ring is the bearing outer ring 2, the second bearing ring is the bearing inner ring 1, the sealing structure is installed on the bearing outer ring 2, the inner diameter of the bearing outer ring 2 is the sealing diameter, the inner sealing connecting groove 8 and the outer sealing connecting groove 13 are arranged on the inner diameter of the bearing outer ring 2, the inner sealing ring connector 7 is matched with the inner sealing connecting groove 8 of the inner diameter of the bearing outer ring 2, the outer sealing ring connector 12 is matched with the outer sealing connecting groove 13 of the inner diameter of the bearing outer ring 2, the first lip 4 of the inner sealing ring 3 is matched with the end face of the bearing inner ring 1, and the second lip 5 is matched with the inner diameter surface of the bearing inner ring 1.

[0032] The above disclosure is only the preferred embodiment of the present application, which certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A wind turbine bearing sealing structure, comprising a first bearing ring, a second bearing ring and a sealing structure, wherein the sealing structure is arranged between the first bearing ring and the second bearing ring, and is characterized in that: The sealing structure is a double sealing ring consisting of an inner sealing ring and an outer sealing ring; the inner sealing ring is a double-lip sealing structure; a first lip and a second lip are arranged on the inner sealing ring, and both the first lip and the second lip are sealed with the second bearing ring, the first lip is sealed with a radial interference fit with the end face of the second bearing ring, and the second lip is sealed with an axial interference fit with the circumferential surface of the second bearing ring.

2. A wind power deflection bearing sealing structure according to claim 1, characterized in that: The outer sealing ring mounting surface contacts the outer diameter of the first bearing ring, and an outer sealing ring connector is arranged on the outer sealing ring mounting surface, and the outer sealing ring connector is connected and matched with the outer sealing connecting groove of the first bearing ring; a third lip is arranged on the outer sealing ring, and the third lip cooperates and seals with the second bearing ring.

3. A wind power deflection bearing sealing structure according to claim 2, characterized in that: A retaining groove is arranged on the circumferential surface of the second bearing ring, and the second lip is interference fit with the inner wall of the retaining groove; an annular groove is arranged on the end surface of the second bearing ring close to the side of the first bearing ring, the first lip is installed in the annular groove, and the third lip is arranged outside the annular groove.

4. A wind power deflection bearing sealing structure according to claim 2, characterized in that: The third lip is radially interference fit sealed with the end face of the second bearing ring, a plurality of barbs are arranged on the outer surface of the outer sealing ring connector, and the barbs are interference fit sealed with the outer sealing connecting groove; the outer sealing ring mounting surface is interference fit sealed with the outer diameter of the first bearing ring.

5. A wind power deflection bearing sealing structure according to claim 1, characterized in that: The inner sealing ring mounting surface contacts the outer diameter of the first bearing ring, and an inner sealing ring connector is arranged on the inner sealing ring mounting surface, and the inner sealing ring connector is connected and matched with the inner sealing connecting groove of the first bearing ring; a convex ring is arranged on the outer surface of the inner sealing ring connector, and the convex ring is interference fit and sealed with the inner sealing connecting groove; the inner sealing ring mounting surface is interference fit and sealed with the outer diameter of the first bearing ring.

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