A new type of semi-direct drive wind power gear box sealing structure

Abstract

The application discloses a novel semi-direct-drive wind power gear box sealing structure, which comprises a high-speed shaft and a bearing seat installed at one end of a wind power gear box body, wherein a sealing assembly is arranged between the bearing seat and the high-speed shaft, the sealing assembly comprises an oil baffle, the oil baffle is installed on the inner side of the bearing seat, a labyrinth sealing inner ring is arranged on the outer side of the oil baffle, the labyrinth sealing inner ring is sleeved on the high-speed shaft, an end cover is arranged on the outer side of the labyrinth sealing inner ring, the end cover is installed on the bearing seat, a packing is installed on the bottom end of the outer side of the end cover, a pressing plate is arranged on the outer side of the packing, and the pressing plate is fixedly connected to the end cover through bolts. The above structure can improve the sealing performance of the wind power gear box body, effectively prevent oil mist in the wind power gear box body from entering the generator, improve the air tightness of the wind power gear box body, prevent gas in the generator from blowing into the wind power gear box body, and axially position the packing through the pressing plate, so that the packing is easy to replace.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power gear box sealing, in particular to a new type of semi-direct drive wind power gear box sealing structure. BACKGROUND

[0002] The wind power gear box is one of the main key components of the wind turbine generator unit, and more and more host factories choose the semi-direct drive route in view of the cost and reliability. The sealing between the gear box and the generator is critical for semi-direct drive, especially integrated semi-direct drive.

[0003] The sealing between the gear box and the generator in the prior art mainly has two ways: one is to use labyrinth seal at the high speed end, but the air tightness of the gear box is not good, and the oil mist inside is easy to enter the generator, causing oil pollution and reducing the efficiency of the generator. In addition, for the air-cooled generator, the gas in the generator is easy to blow into the gear box, causing the air filter to fail prematurely. The other is to use skeleton oil seal at the high speed end, but the skeleton oil seal will reduce the efficiency of the gear box, and it is not easy to replace. SUMMARY

[0004] In order to overcome the above technical problems, the purpose of the present application is to provide a new type of semi-direct drive wind power gear box sealing structure, which adopts the way of labyrinth seal plus packing seal, not only improves the sealing of the wind power gear box body, effectively prevents the oil mist in the wind power gear box body from entering the generator, improves the air tightness of the wind power gear box body, but also prevents the gas in the generator from blowing into the wind power gear box body, in addition, the packing is axially positioned by the pressing plate, which is easy to replace.

[0005] The purpose of the present application can be realized by the following technical scheme:

[0006] A new type of semi-direct drive wind power gear box sealing structure, comprising a high speed shaft and a bearing seat installed at one end of a wind power gear box body, wherein a sealing assembly is arranged between the bearing seat and the high speed shaft, the sealing assembly comprises an oil baffle, and the oil baffle is installed on the inner side of the bearing seat, a labyrinth seal inner ring is arranged on the outer side of the oil baffle, and the labyrinth seal inner ring is sleeved on the high speed shaft, an end cover is arranged on the outer side of the labyrinth seal inner ring, and the end cover is installed on the bearing seat, a packing is installed on the outer side bottom end of the end cover, and a pressing plate is arranged on the outer side of the packing, the pressing plate is fixedly connected to the end cover by bolts, and an oil collecting groove is arranged on the outer side top end of the end cover, and the oil collecting groove is fixedly connected to the end cover by bolts.

[0007] As a further scheme of the present application: the outer shaft surface of the oil baffle is attached to the inner circular surface of the bearing seat, and a labyrinth seal end is arranged on the side of the oil baffle away from the bearing seat.

[0008] As a further scheme of the present application: the labyrinth seal end is provided with a plurality of wedge-shaped grooves, and the high-speed shaft is provided with a plurality of high-speed shaft outer rings at positions corresponding to the wedge-shaped grooves, the plurality of high-speed shaft outer rings and the plurality of wedge-shaped grooves are mutually fitted, and the single-side size gap of the fitting is 1mm.

[0009] As a further scheme of the present application: the labyrinth seal inner ring is in interference fit with the high-speed shaft.

[0010] As a further scheme of the present application: the labyrinth seal inner ring is provided with a plurality of sealing grooves on one side, and the end cover is provided with a plurality of sealing end heads on one side, the plurality of sealing end heads and the plurality of sealing grooves are mutually fitted, and the single-side size gap of the fitting is 1mm.

[0011] As a further scheme of the present application: the end cover is provided with a mounting groove on the outside bottom end, and the packing is mounted in the mounting groove, and the packing material is polytetrafluoroethylene.

[0012] The present application has the following beneficial effects:

[0013] The present application adopts the way of labyrinth seal plus packing seal, which not only improves the sealing property of the wind power gear box body, effectively prevents the oil mist in the wind power gear box body from entering the generator, improves the air tightness of the wind power gear box body, but also prevents the gas in the generator from blowing into the wind power gear box body, in addition, the packing is axially positioned by the pressing plate, is easy to replace, and is provided with a plurality of complex labyrinth seals, which can effectively prevent the wind power gear box body from leaking oil. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in combination with the drawings.

[0015] Figure 1 is a schematic diagram of the overall structure of the wind power gear box body in the present application;

[0016] Figure 2 is Figure 1 a schematic diagram of the enlarged structure of area A in the present application;

[0017] Figure 3 is Figure 2 a schematic diagram of the enlarged structure of area B in the present application;

[0018] Figure 4 is Figure 3 a schematic diagram of the enlarged structure of area C in the present application;

[0019] Figure 5 is Figure 3 a schematic diagram of the enlarged structure of area D in the present application.

[0020] In the figure: 1, the wind turbine gearbox body; 11, hollow tube shaft; 12, high-speed shaft; 121, high-speed shaft outer ring; 13, bearing; 14, bearing seat; 15, sealing assembly; 151, oil baffle; 152, labyrinth seal inner ring; 153, end cover; 154, packing; 155, oil collecting groove; 156, pressing plate; 157, bolt; 1511, wedge-shaped groove; 1521, sealing groove; 1531, sealing end. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the protection scope of the present application.

[0022] As Figures 1-5 shown, it is a new type of semi-direct drive wind turbine gearbox sealing structure, wherein the semi-direct drive wind turbine gearbox includes a wind turbine gearbox body 1, one end of the wind turbine gearbox body 1 is provided with a sealing structure, which is used to seal the wind turbine gearbox body 1, improve the air tightness of the wind turbine gearbox body 1, and effectively prevent the oil mist of the wind turbine gearbox body 1 from entering the generator.

[0023] As Figure 2 shown, the sealing structure includes a high-speed shaft 12 installed at one end of the wind turbine gearbox body 1, wherein the high-speed shaft 12 is fixedly installed on the hollow tube shaft 11 arranged inside the wind turbine gearbox body 1, the hollow tube shaft 11 drives the high-speed shaft 12 to rotate, wherein the wind turbine gearbox body 1 is further provided with a bearing seat 14 at one end close to the high-speed shaft 12, and a bearing 13 is installed between the bearing seat 14 and the high-speed shaft 12 for connection, and further a sealing assembly 15 is arranged between the bearing seat 14 and the outside of the high-speed shaft 12, to seal the entire wind turbine gearbox body 1, and the sealing assembly 15 effectively prevents the gas of the generator from entering the inside of the wind turbine gearbox body 1.

[0024] Further as Figure 3As shown in the drawings, the sealing assembly 15 comprises an oil baffle 151 arranged between the bearing seat 14 and the high-speed shaft 12, and the oil baffle 151 is mounted on the inner side of the bearing seat 14 by a pin, the outer shaft surface of the oil baffle 151 is attached to the inner circular surface of the bearing seat 14, and the side of the oil baffle 151 away from the bearing seat 14 is provided with a labyrinth sealing end, which is adapted to seal with the high-speed shaft 12 to form the first sealing. Furthermore, the outer side of the oil baffle 151 is provided with a labyrinth sealing inner ring 152, which is sleeved on the high-speed shaft 12 and is in interference fit with the high-speed shaft 12. An end cover 153 is arranged outside the labyrinth sealing inner ring 152, and the end cover 153 is mounted on the bearing seat 14 by a pin. The end cover 153 and the labyrinth sealing inner ring 152 are also adapted to seal to form the second sealing. Furthermore, the outer side of the end cover 153 is provided with a mounting groove at the bottom end, and a packing 154 is mounted in the mounting groove. The packing 154 is a polytetrafluoroethylene packing, and a pressing plate 156 is arranged outside the packing 154. The pressing plate 156 is fixedly connected to the end cover 153 by a bolt 157. The pressing plate 156 presses the packing 154 in the mounting groove, so that the packing 154 can be easily maintained. When the packing 154 needs to be replaced, the pressing plate 156 can be removed to take out the packing 154, which is convenient to install and disassemble. Furthermore, the top end of the end cover 153 is also fixedly connected to an oil collecting groove 155 by a bolt 157. The oil collecting groove 155 is annular and hollow inside to facilitate the collection of a small amount of oil seepage from the wind power gear box body 1 during startup.

[0025] Further as shown in the drawings, Figure 4 and Figure 5 The labyrinth sealing end is provided with a plurality of wedge-shaped grooves 1511, and the high-speed shaft 12 is provided with a plurality of high-speed shaft outer rings 121 at the position corresponding to the labyrinth sealing end of the oil baffle 151. The plurality of high-speed shaft outer rings 121 and the plurality of wedge-shaped grooves 1511 mutually fit to form a radial and axial labyrinth seal, and the single-sided size gap of the fit is 1mm, which has the effect of throwing oil. The end cover 153 is provided with a plurality of sealing end heads 1531 near the labyrinth sealing inner ring 152, and the labyrinth sealing inner ring 152 is provided with a plurality of sealing grooves 1521 near the end cover 153. The plurality of sealing end heads 1531 and the plurality of sealing grooves 1521 mutually fit to form another axial and radial labyrinth seal, and the single-sided size gap of the fit is also 1mm, which has the effect of throwing oil. The two complex labyrinth seals can effectively prevent the wind power gear box body 1 from leaking oil.

[0026] Further as shown in the drawings, Figure 3 When the packing 154 is full of oil before being replaced, a small amount of oil will seep out of the wind power gear box body 1 during startup and flow into the oil collecting groove 155 along the pressing plate 156, which has no effect on the wind power gear box body 1 and the generator.

[0027] Working principle of the present application:

[0028] An oil baffle 151 is arranged between the high-speed shaft 12 and the bearing seat 14 of the wind turbine gearbox body 1, so that the oil baffle 151 and the high-speed shaft 12 form a first labyrinth seal, and a labyrinth seal inner ring 152 and an end cover 153 are further arranged, so that the labyrinth seal inner ring 152 and the end cover 153 are matched with each other to form a second labyrinth seal, and then a packing 154 is installed at the bottom end of the end cover 153 to avoid oil mist leakage inside the wind turbine gearbox body 1.

[0029] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. 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 application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, and a particular orientation configuration and operation, therefore, it cannot be understood as a limitation on the present application. In addition, "first", "second" are only for the purpose of description, 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" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] The above describes one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered as limiting the scope of the present application. Any equivalent changes and improvements made within the scope of the present application shall still belong to the patent scope of the present application.

Claims

1. A novel semi-direct drive wind turbine gearbox sealing structure, comprising a high-speed shaft (12) and a bearing housing (14) mounted at one end of a wind turbine gearbox body (1), wherein a sealing assembly (15) is provided between the bearing housing (14) and the high-speed shaft (12), characterized in that, The sealing assembly (15) includes an oil baffle (151), which is installed inside the bearing housing (14). A labyrinth seal inner ring (152) is provided on the outer side of the oil baffle (151), and the labyrinth seal inner ring (152) is sleeved on the high-speed shaft (12). An end cap (153) is provided on the outer side of the labyrinth seal inner ring (152), and the end cap (153) is installed on the bearing housing (14). A packing is installed at the bottom of the outer side of the end cap (153). 154), and a pressure plate (156) is provided on the outside of the packing (154). The pressure plate (156) is fixedly connected to the end cover (153) by bolts (157). An oil collection groove (155) is provided on the top of the outside of the end cover (153). The oil collection groove (155) is fixedly connected to the end cover (153) by bolts (157). The oil collection groove (155) is annular and hollowed out inside, so as to collect a small amount of oil that seeps out of the wind turbine gearbox body (1) during startup. The outer axial surface of the oil baffle (151) is in contact with the inner circular surface of the bearing seat (14), and a labyrinth seal end is provided on the side of the oil baffle (151) away from the bearing seat (14); the labyrinth seal end is provided with multiple wedge grooves (1511), and multiple high-speed shaft outer rings (121) are provided on the corresponding positions of the wedge grooves (1511). The multiple high-speed shaft outer rings (121) and the multiple wedge grooves (1511) fit together to form a labyrinth seal in the radial and axial directions, and the single-sided gap of the fit is 1mm. The labyrinth seal inner ring (152) is interference-fitted with the high-speed shaft (12); multiple sealing grooves (1521) are provided on one side of the labyrinth seal inner ring (152), and multiple sealing ends (1531) are provided on one side of the end cap (153). The multiple sealing ends (1531) and the multiple sealing grooves (1521) fit together to form another axial and radial labyrinth seal, and the single-sided size gap of the fit is 1mm.

2. The novel semi-direct drive wind turbine gearbox sealing structure according to claim 1, characterized in that, The end cap (153) has an installation groove at the bottom of its outer side, and the packing (154) is installed in the installation groove. The packing (154) is made of polytetrafluoroethylene.

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