A pitch gearbox oil seal device with oil leakage prevention function and its use method

Abstract

The present invention relates to the technical field of oil seals. Specifically, the present invention relates to a variable pitch gearbox oil seal device with an oil leakage prevention function and a method of use, comprising a housing, a hose, an end cover, a limit block and an annular spring. The housing is threadedly connected to a connecting pipe, the connecting pipe is threadedly connected to a threaded block, the end of the threaded block is fixedly connected to an end cover, and the outer surface of the end cover is respectively fixedly connected to a limit block and a hose. The present invention contracts the annular spring, thereby squeezing the pressing block to tighten and deform the hose, so that the pressing block squeezes the sealing block, thereby ensuring that the sealing block is tightly attached to the surface of the shaft body in the variable pitch gearbox to ensure the sealing effect. The end cover squeezes the sealing gasket to seal the gap between the housing and the end cover, thereby enhancing the oil leakage prevention effect. The housing and the end cover are clamped by a tool and then rotated in the opposite direction to separate the threaded block from the thread groove, rotate the connecting pipe to separate it from the housing, take out the hose and the sealing block, and facilitate maintenance and replacement work.

Description

Technical Field

[0001] The present invention relates to the technical field of oil seals, and in particular to an oil seal device for a variable pitch gearbox with an oil leakage prevention function and a method of using the same. Background Art

[0002] A variable pitch gearbox is a regulating device used in wind turbines. Gearboxes are an important mechanical component widely used in wind turbines. Its main function is to transmit the power generated by the wind rotor to the generator and make it obtain the corresponding speed. Usually, the speed of the wind rotor is very low, far from the speed required by the generator. It must be achieved through the speed increase of the gear pair of the gearbox, so the gearbox is also called a speed increaser. During the operation of the variable pitch gearbox, a gear set is installed in the gearbox to achieve the speed change function. In order to reduce the wear between the gears, lubricating oil is injected into the gearbox. As the gears rotate, the output shaft of the gearbox is usually sealed with a shaft seal. When the sealing ring in the shaft seal wears out and a gap appears or the sealing is insufficient, oil leakage will occur. For this reason, the present invention proposes a variable pitch gearbox oil seal device with an anti-oil leakage function. Summary of the Invention

[0003] The purpose of the present invention is to provide a pitch gearbox oil seal device with an anti-oil leakage function and a method of using the same in order to solve the above problems.

[0004] The embodiments of the present invention are achieved through the following technical solutions:

[0005] A variable pitch gearbox oil seal device with an anti-oil leakage function includes a shell, a hose, an end cover, a limit block and an annular spring. The shell is threadedly connected to a connecting pipe, the connecting pipe is threadedly connected to a threaded block, the end of the threaded block is fixedly connected to the end cover, the outer surface of the end cover is respectively fixedly connected to the limit block and the hose, the outer surface of the hose is wrapped with an annular spring, a sealing block is sleeved in the hose, a pressure block is fixedly installed through the hose, a connecting rod is inserted into the hose, and a sealing gasket is fixedly connected to the outer surface of the end cover.

[0006] In one embodiment of the present invention, the connecting pipe is provided with screw threads, and the inner wall of the shell is provided with threads matching the screw threads on the connecting pipe.

[0007] In one embodiment of the present invention, a working chamber is formed between the connecting pipe and the hose, and the annular spring is located inside the working chamber. There are three annular springs, and the three annular springs are equidistantly distributed on the outer surface of the hose.

[0008] In one embodiment of the present invention, the number of the pressing blocks is twelve, and the twelve pressing blocks are distributed on the hose at equal angles.

[0009] In one embodiment of the present invention, there are multiple connecting rods, which are distributed in an equiangular circle, and one end of the connecting rod is fixedly connected to the inner wall of the shell.

[0010] In one embodiment of the present invention, the end of the sealing gasket is attached to the outer surface of the shell, and the two ends of the sealing block are respectively against the shell and the end cover.

[0011] In one embodiment of the present invention, a thread groove is provided on the connecting pipe, the thread block is located inside the thread groove, and the thread block is provided with threads matching the threads in the thread groove.

[0012] In one embodiment of the present invention, outer surfaces of the pressing blocks respectively abut against outer surfaces of the sealing blocks, a through opening is provided on the shell, and a connecting opening is provided on the end cover.

[0013] A pitch gearbox oil seal device with an oil leakage prevention function and a method for using the same, the method comprising the following steps:

[0014] Install the oil seal device at the corresponding position in the pitch gearbox;

[0015] By rotating the end cover, the thread block is engaged with the thread groove;

[0016] When the pitch gearbox oil seal device needs to be repaired or disassembled, the housing and the end cover are clamped and then rotated in the opposite direction to separate the thread block from the thread groove.

[0017] Turn the connecting pipe to separate it from the housing and take out the hose and sealing block.

[0018] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0019] 1. The present invention contracts the annular spring, thereby squeezing the pressing block to tighten and deform the hose, so that the pressing block squeezes the sealing block, thereby ensuring that the sealing block is in close contact with the surface of the shaft in the variable pitch gearbox to ensure the sealing effect. The end cover squeezes the sealing gasket to seal the gap between the shell and the end cover, further enhancing the effect of preventing oil leakage.

[0020] 2. The present invention clamps the shell and the end cover with corresponding tools and then rotates the shell and the end cover in reverse, so that the thread block is separated from the thread groove, the connecting pipe is rotated to separate from the shell, and the hose and the sealing block are taken out, which facilitates the maintenance and replacement of the corresponding components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic diagram of the main three-dimensional structure of the present invention;

[0023] Figure 2 It is a rear-view stereoscopic structural diagram of the present invention;

[0024] Figure 3 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0025] Figure 4 It is a schematic diagram of the left side cross-sectional structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 Schematic diagram of the locally enlarged structure at point A in the middle.

[0027] In the figure: 1-housing; 2-hose; 3-end cover; 4-limiting block; 5-annular spring; 6-threaded block; 7-connecting pipe; 8-working chamber; 9-sealing block; 10-pressing block; 11-connecting rod; 12-sealing gasket; 13-connecting port; 14-through port; 15-threaded groove. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] In the description of the inventive type, it should be understood that the terms "center", "middle", "eccentric", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the inventive type and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the inventive type.

[0030] Please refer to Figure 1-Figure 5 A pitch gearbox oil seal device with an anti-oil leakage function mainly includes a shell 1, a hose 2, an end cover 3, a limit block 4 and an annular spring 5. Its main structure is the shell 1 and the end cover 3 arranged on the outermost side. The shell 1 is cylindrical, and the end cover 3 is a circular plate structure, and its bottom extends a certain distance into the shell 1.

[0031] The internal thread of the shell 1 is connected to a connecting pipe 7. Specifically, a thread is provided on the connecting pipe 7, and a thread matching the thread on the connecting pipe 7 is provided on the inner wall of the shell 1. The connecting pipe 7 is connected to the shell 1 through a thread, which can facilitate subsequent disassembly, repair and maintenance.

[0032] A threaded block 6 is provided on the side surface of the end cover 3 facing the shell 1, and the threaded block 6 is threadedly connected to the inner surface of the connecting pipe 7. Specifically, a threaded groove 15 is provided on the connecting pipe 7, and the threaded block 6 is located inside the threaded groove 15. The threaded block 6 is provided with a thread that matches the inner thread of the thread groove 15.

[0033] A sealing block 9 is provided on the innermost side of the shell 1 , with both ends of the sealing block 9 respectively abutting against the shell 1 and the end cover 3 . The sealing block 9 can directly contact the shaft body, and sealing is achieved by squeezing the sealing block 9 .

[0034] In this embodiment, a hose 2 is provided on the outside of the sealing block 9, a pressure block 10 is fixedly provided inside the hose 2, and a connecting rod 11 is provided between adjacent pressure blocks 10. A docking port is provided on the hose 2, and the connecting rod 11 is movably inserted into the docking port to facilitate the replacement of the connecting rod 11.

[0035] Specifically, there are twelve pressing blocks 10, which are distributed on the hose 2 at equal angles. There are multiple connecting rods 11, which are distributed on the hose 2 at equal angles. One end of the connecting rod 11 is fixedly connected to the inner wall of the shell 1. The connection rod 11 and the docking port cooperate to facilitate the installation and positioning of the hose 2.

[0036] An annular spring 5 is also wound between the hose 2 and the connecting pipe 7. Specifically, a working chamber 8 is formed between the connecting pipe 7 and the hose 2. The annular spring 5 is located inside the working chamber 8. There are three annular springs 5, which are equidistantly distributed on the outer surface of the hose 2. A limit block 4 is also provided near the threaded block 6 at the end cover 3 to confine the annular spring 5 inside the working chamber 8.

[0037] A sealing gasket 12 is fixedly connected to the outer surface of the end cover 3, and the end of the sealing gasket 12 can be attached to the outer surface of the shell 1. The outer surfaces of the pressure block 10 are respectively against the outer surfaces of the sealing block 9. A through opening 14 is opened on the shell 1, and a connecting port 13 is opened on the end cover 3.

[0038] The present invention contracts the annular spring 5, thereby squeezing the pressing block 10 to tighten and deform the hose 2, so that the pressing block squeezes the sealing block 9, thereby ensuring that the sealing block 9 is in close contact with the surface of the shaft in the variable pitch gearbox to ensure the sealing effect. The end cover 3 squeezes the sealing gasket 12 to seal the gap between the shell 1 and the end cover 3, further enhancing the effect of preventing oil leakage.

[0039] A pitch gearbox oil seal device with an oil leakage prevention function and a method for using the same, the method comprising the following steps:

[0040] The first step is to install the oil seal device at the corresponding position in the pitch gearbox. During use, due to the friction between the shafts in the pitch gearbox, the sealing block 9 is worn and thinned. The annular spring 5 contracts inward, thereby squeezing the pressure block 10, causing the hose 2 to tighten and deform, so that the pressure block 10 squeezes the sealing block 9, thereby ensuring that the sealing block 9 is close to the surface of the shaft in the pitch gearbox to ensure the sealing effect.

[0041] In the second step, the end cover 3 is rotated to make the thread block 6 threadably engaged with the thread groove 15, so that the end cover 3 squeezes the sealing gasket 12 to seal the gap between the shell 1 and the end cover 3, further enhancing the effect of preventing oil leakage.

[0042] In the third step, when it is necessary to repair and disassemble the oil seal device of the variable pitch gearbox, it is only necessary to clamp the shell 1 and the end cover 3 with the corresponding tools and then rotate the shell 1 and the end cover 3 in the opposite direction to separate the thread block 6 from the thread groove 15, rotate the connecting pipe 7 to separate it from the shell 1, take out the hose 2 and the sealing block 9, and then the staff will carry out the repair and replacement of the corresponding components.

[0043] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pitch gearbox oil seal device with an oil leakage prevention function, characterized by: The invention comprises a shell (1), a hose (2), an end cover (3), a limit block (4) and an annular spring (5); the shell (1) is internally threadedly connected to a connecting pipe (7); the connecting pipe (7) is threadedly connected to a thread block (6); the end of the thread block (6) is fixedly connected to the end cover (3); the limit block (4) and the hose (2) are respectively fixedly connected on the outer surface of the end cover (3); the outer surface of the hose (2) is wound with an annular spring (5); the hose (2) is sleeved with a sealing block (9); the hose (2) is fixedly penetrated by a pressure block (10); the hose (2) is plugged with a connecting rod (11); the outer surface of the end cover (3) is fixedly connected to a sealing gasket (12); A working chamber (8) is formed between the connecting pipe (7) and the hose (2), and the annular spring (5) is located inside the working chamber (8). The number of the annular springs (5) is three, and the three annular springs (5) are equidistantly distributed on the outer surface of the hose (2); The number of the pressing blocks (10) is twelve, and the twelve pressing blocks (10) are distributed on the hose (2) at equal angles. There are multiple connecting rods (11), which are distributed in an equiangular circumference. One end of the connecting rod (11) is fixedly connected to the inner wall of the shell (1).

2. The pitch gearbox oil seal device with oil leakage prevention function according to claim 1, characterized in that: The connecting pipe (7) is provided with screw threads, and the inner wall of the housing (1) is provided with threads matching the screw threads on the connecting pipe (7).

3. The pitch gearbox oil seal device with oil leakage prevention function according to claim 1, characterized in that: The end of the sealing gasket (12) is attached to the outer surface of the shell (1), and the two ends of the sealing block (9) are respectively against the shell (1) and the end cover (3).

4. The pitch gearbox oil seal device with oil leakage prevention function according to claim 1, characterized in that: The connecting pipe (7) is provided with a thread groove (15), the thread block (6) is located inside the thread groove (15), and the thread block (6) is provided with a thread matching the internal thread of the thread groove (15).

5. The pitch gearbox oil seal device with oil leakage prevention function according to claim 1, characterized in that: The outer surfaces of the pressing blocks (10) respectively abut against the outer surfaces of the sealing blocks (9); a through opening (14) is provided on the shell (1); and a connecting opening (13) is provided on the end cover (3).

6. A method for using the oil seal device for a variable pitch gearbox with an oil leakage prevention function according to any one of claims 1 to 5, characterized in that: The method of use comprises the following steps: Install the oil seal device at the corresponding position in the pitch gearbox; By rotating the end cover (3), the threaded block (6) is threadedly engaged with the threaded groove (15); When the pitch gearbox oil seal device needs to be repaired or disassembled, the housing (1) and the end cover (3) are clamped and then the housing (1) and the end cover (3) are rotated in opposite directions so that the thread block (6) is separated from the thread groove (15); Rotate the connecting pipe (7) to separate it from the housing (1), and take out the hose (2) and the sealing block (9).

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