Tilting pad mechanism of hydrostatic pressure sliding bearing

Abstract

According to the tilting pad mechanism of the hydrostatic pressure sliding bearing, two inclined oil cavities are symmetrically formed between an outer ring and an inner ring of the bearing, pads are arranged in the oil cavities, the faces, close to the inner ring, of the pads are spherical surfaces, the oil cavities are divided into first oil cavities and second oil cavities through the pads, the first oil cavities are close to the outer ring, and the second oil cavities are close to the inner ring; lubricant is injected into the first oil cavity, and high-pressure oil is injected into the second oil cavity. According to the tilting pad mechanism, under the extrusion effect of high-pressure oil in the second oil cavity on the spherical surfaces of the pads, the corresponding surfaces of the pads can be automatically attached to the sliding face of the bearing outer ring, even if a large load is borne and the bearing inner ring deforms, the pads can automatically adjust the inclination angle, so that the corresponding surfaces of the pads are always attached to the sliding face of the outer ring, and the service life of the bearing is prolonged. Good fitting precision of the tile blocks and the sliding surface is kept, so that static pressure is formed; when the inner ring and the outer ring move relatively, the tile blocks can adjust the inclination angle in real time, and the situation that the outer ring of the bearing inclines due to working pressure loss is avoided.

Description

Technical Field

[0001] The utility model relates to a liquid static pressure sliding bearing, in particular to a tilting shoe mechanism of the liquid static pressure sliding bearing. Background Art

[0002] A hydrostatic sliding bearing is a sliding bearing that uses a pressure pump to forcefully pump pressurized lubricant into the tiny gap between the bearing and the shaft, while a liquid hydrostatic sliding bearing relies on an external supply of pressurized oil to establish a hydrostatic load-bearing oil film in the bearing to achieve liquid lubrication. It has the characteristics of high rotation accuracy, high rigidity, smooth rotation, very small sliding friction coefficient, low heat generation, liquid friction, and no vibration. When it is used as a bearing on the main shaft of a wind turbine, due to the large load, the sliding surface and the inner ring of the hydrostatic sliding bearing will deform, which will reduce the fitting accuracy between the bearing shell and the outer ring of the bearing, making it difficult to form static pressure. In severe cases, working pressure loss will occur, causing the outer ring of the bearing to tilt and leading to uneven air gaps between the stator and rotor of the wind turbine. Utility Model Content

[0003] Based on the problems existing in the existing liquid hydrostatic sliding bearings as bearings on the main shaft of a wind turbine as described in the background technology, the utility model provides a tilting pad mechanism of a liquid hydrostatic sliding bearing, wherein two inclined oil chambers are symmetrically arranged between the outer ring and the inner ring of the bearing, wherein a pad is arranged in the oil chamber, wherein a side of the pad close to the inner ring is a spherical surface, and the pad divides the oil chamber into a first oil chamber and a second oil chamber, wherein the first oil chamber is close to the outer ring, and the second oil chamber is close to the inner ring, wherein a lubricant is injected into the first oil chamber, and wherein a high-pressure oil is injected into the second oil chamber; under the squeezing effect of the high-pressure oil on the spherical surface of the pad, the The corresponding surface of the tile can automatically fit the sliding surface of the outer ring of the bearing. Even when the bearing inner ring is deformed under a large load, the spherical surface of the tile can automatically adjust its tilt angle under the extrusion of high-pressure oil, so that its corresponding surface always fits the sliding surface of the outer ring, maintaining a good fit accuracy between the tile and the sliding surface and forming static pressure. When the inner ring and the outer ring move relative to each other, the tile can also adjust its tilt angle in real time to avoid tilting of the bearing outer ring due to working pressure loss. When it is used as a bearing on the main shaft of a wind turbine, it can keep the air gap between the stator and rotor of the wind turbine uniform.

[0004] Preferably, the cross-section of the outer ring at its inner ring is an isosceles trapezoid, and a trapezoidal groove matching the shape of the outer ring is provided at a corresponding position on the outer ring surface of the inner ring, and inclined grooves are respectively provided on the two inclined surfaces of the trapezoidal groove, and the cavity formed between the inclined groove and the inner ring surface of the outer ring is the inclined oil chamber; the oil chamber structure formed in this way enables the shoe to support the outer ring of the bearing more stably, so that it can withstand larger loads in both radial and axial directions.

[0005] Preferably, a first oil supply channel and a second oil supply channel are provided on the inner ring, the first oil supply channel is connected to the first oil chamber, and the second oil supply channel is connected to the second oil chamber; the second oil supply channel is specifically connected to an external lubricating oil pump system to provide high-pressure oil to the second oil chamber.

[0006] Through the above technical solution, the utility model at least includes the following beneficial effects:

[0007] The tilting pad mechanism of the liquid hydrostatic sliding bearing described in the present application forces the spherical surface of the pad to rotate under the action of the high-pressure oil in the second oil chamber, and the corresponding surface of the pad can automatically fit the sliding surface of the outer ring of the bearing. Even when it is subjected to a large load and the inner ring of the bearing is deformed, the spherical surface of the pad can automatically adjust its tilt angle under the squeezing action of the high-pressure oil, so that the corresponding surface of the pad always fits the sliding surface of the outer ring, maintaining a good fitting accuracy between the pad and the sliding surface, so that static pressure is formed; when the inner ring and the outer ring move relative to each other, the pad can also adjust its tilt angle in real time to avoid tilting of the outer ring of the bearing due to working pressure loss. Therefore, when the liquid hydrostatic sliding bearing with the tilting pad mechanism is used as a bearing on the main shaft of a wind turbine, the air gap between the stator and the rotor of the wind turbine can always be kept uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a cross-sectional view of a tilting pad mechanism of a liquid hydrostatic sliding bearing described in an embodiment of the present application;

[0009] Figure 2 It is a schematic diagram of the overall structure of the liquid hydrostatic sliding bearing with the tilting pad mechanism. DETAILED DESCRIPTION

[0010] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the structures related to the present invention.

[0011] In the description of this application, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention 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. Therefore, the terms describing the positional relationship are only used for exemplary description and cannot be understood as limiting this patent; if there are terms such as "first", "second", etc., they are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the said features. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0012] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0013] refer to Figure 1 A tilting pad mechanism of a liquid hydrostatic sliding bearing is provided, wherein two inclined oil chambers are symmetrically arranged between the outer ring 1 and the inner ring 2 of the bearing, wherein a pad 3 is arranged in the oil chamber, wherein the side of the pad 3 close to the inner ring 2 is a spherical surface, and the pad 3 divides the oil chamber into a first oil chamber 4 and a second oil chamber 5, wherein the first oil chamber 4 is close to the outer ring 1, and the second oil chamber 5 is close to the inner ring 2, wherein the first oil chamber 4 is filled with lubricant, and the second oil chamber 5 is filled with high-pressure oil; under the squeezing effect of the high-pressure oil on the spherical surface of the pad 3, the corresponding surface of the pad 3 can automatically fit the sliding surface of the inner ring of the outer ring 1 of the bearing. dynamic surface; even when subjected to a large load and the inner ring 2 of the bearing is deformed, the spherical surface of the tile 3 can automatically adjust its tilt angle under the extrusion of the high-pressure oil, so that the corresponding surface of the tile 3 always fits the sliding surface of the outer ring 1, maintaining a good fit accuracy between the tile 3 and the sliding surface, and forming static pressure; when the inner ring 2 and the outer ring 1 move relative to each other, the tile 3 can also adjust its tilt angle in real time to avoid the tilt of the outer ring 1 of the bearing due to working pressure loss. When it is used as a bearing on the main shaft of a wind turbine, it can keep the air gap between the stator and rotor of the wind turbine uniform at all times.

[0014] The cross-section of the outer ring 1 at its inner ring is an isosceles trapezoid, and a trapezoidal groove matching the shape of the outer ring 1 is provided at a corresponding position on the outer ring surface of the inner ring 2, and inclined grooves 6 are respectively provided on the two inclined surfaces of the trapezoidal groove, and the cavity formed between the inclined groove 6 and the inner ring surface of the outer ring 1 is the above-mentioned inclined oil chamber; the oil chamber structure formed in this way enables the shoe 3 to support the bearing outer ring 1 more stably, so that it can withstand larger loads in both radial and axial directions.

[0015] In a specific embodiment, a first oil supply channel 7 and a second oil supply channel 8 are opened on the inner ring 2, the first oil supply channel 7 is connected to the first oil chamber 4, and the second oil supply channel 8 is connected to the second oil chamber 5; the second oil supply channel 8 is specifically connected to an external lubricating oil pump system to provide high-pressure oil to the second oil chamber 5.

[0016] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Based on the present invention and the above description, relevant personnel can make various changes and modifications without departing from the technical idea of ​​the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tilting pad mechanism of a hydrostatic sliding bearing, characterized in that: Two inclined oil chambers are symmetrically arranged between the outer ring (1) and the inner ring (2) of the bearing. A tile (3) is arranged in the oil chamber. The tile (3) has a spherical surface on a surface close to the inner ring (2). The tile (3) divides the oil chamber into a first oil chamber (4) and a second oil chamber (5). The first oil chamber (4) is close to the outer ring (1), and the second oil chamber (5) is close to the inner ring (2). Lubricant is injected into the first oil chamber (4), and high-pressure oil is injected into the second oil chamber (5).

2. The tilting pad mechanism of a hydrostatic sliding bearing according to claim 1, characterized in that: The cross section of the outer ring (1) at its inner ring is an isosceles trapezoid. The outer ring surface of the inner ring (2) is provided with a trapezoidal groove matching the shape of the outer ring (1) at a corresponding position. The two inclined surfaces of the trapezoidal groove are respectively provided with inclined grooves (6). The cavity formed between the inclined groove (6) and the inner ring surface of the outer ring (1) is the inclined oil cavity.

3. The tilting pad mechanism of a hydrostatic sliding bearing according to claim 2, characterized in that: The inner ring (2) is provided with a first oil supply channel (7) and a second oil supply channel (8); the first oil supply channel (7) is communicated with the first oil chamber (4), and the second oil supply channel (8) is communicated with the second oil chamber (5).

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