Sealing device for floating tile of oil head of water turbine

Abstract

The utility model provides a water turbine oil-supply head floating tile sealing device, which relates to the field of water turbines, and comprises an oil-supply head main body, an upper operation oil pipe and an oil transportation mechanism which is matched and connected with the inner side of the oil-supply head main body, the oil transportation mechanism comprises an upper gland, a lower gland, an upper floating tile, a lower floating tile and a plurality of sealing rings, the sealing ring is divided into an upper sealing layer, a lower sealing layer and a center sliding layer used for reducing friction between the sealing ring and the gland, metal rings used for enhancing the torsion resistance of the sealing ring are embedded into the inner side of the upper sealing layer and the inner side of the lower sealing layer, the sealing ring of the V-shaped structure with the good anti-vibration and anti-abrasion effects is used, the excessive abrasion, caused by vibration, of the sealing ring is reduced, and the service life of the sealing ring is prolonged. Meanwhile, the strength of the sealing ring is improved by using the metal ring, the torsion resistance of the sealing ring is improved, and the service life of the sealing ring is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to water turbine technical field, concretely is a water turbine oil receiver floating shoe sealing device. BACKGROUND

[0002] Water turbine generator unit oil receiver is an important component of double-regulating unit water turbine, and the main role of the oil receiver is to introduce the pressure oil from the main pressure regulating valve of the speed regulating system into the rotating operation oil pipe from the fixed oil pipe, and deliver the pressure oil to the runner servomotor through the operation oil pipe to realize the control of the runner blade opening degree and ensure the safe and efficient operation of the unit.

[0003] Since the pressure oil needs to be delivered from the fixed part to the rotating part, there must be a seal between the fixed part and the rotating part. During the operation of the unit, it is found that the leakage of the floating shoe seal is large, causing the pressure oil pump of the unit to start frequently, the temperature of the pressure oil to rise, etc. To deal with this defect, the unit needs to be shut down and put on standby, which takes a long time. After disassembly, it is found that the upper and lower O-shaped sealing rings of the floating shoe are excessively worn and damaged. Through analysis, the main reason for the damage of the seal is the operation in the low head and high vibration area. In addition, the sealing groove of the O-shaped sealing ring is easy to be extruded, turned over and rubbed under vibration, resulting in a low service life of the sealing ring. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a water turbine oil receiver floating shoe sealing device, which uses a V-shaped structure sealing ring with good anti-vibration and anti-wear effect, reduces the transitional wear of the sealing ring caused by vibration, and increases the strength of the sealing ring by using a metal ring, improves the anti-torsion performance of the sealing ring, prolongs the service life of the sealing ring, and solves the problems raised in the background art.

[0005] TECHNICAL SCHEME

[0006] To achieve the above purpose, the utility model realizes the following technical scheme: a water turbine oil receiver floating shoe sealing device, comprising an oil receiver main body, an upper operation oil pipe and an oil delivery mechanism connected with the inner side of the oil receiver main body, the oil delivery mechanism comprising upper and lower pressure covers, upper and lower floating shoes and a plurality of sealing rings, the cross section of the sealing ring is a V-shaped structure with an inner concave inner side wall, the sealing ring is divided into an upper sealing layer, a lower sealing layer and a central sliding layer for reducing the friction between the sealing ring and the pressure cover, and the inner side of the upper sealing layer and the lower sealing layer is embedded with a metal ring for strengthening the anti-torsion performance of the sealing ring.

[0007] Further, the inner side of the central sliding layer is provided with a sliding cavity.

[0008] Further, when the sealing ring is compressed between the pressure cover and the floating shoe, the inner wall of the sliding cavity is in close contact.

[0009] Furthermore, several oil storage holes are provided inside the sliding cavity. When the pressure cap is pressed onto the floating bearing, the oil storage holes are alternately distributed inside the sliding cavity.

[0010] Furthermore, an oil injection hole communicating with the sliding cavity is provided on the inner side of the upper sealing layer, and the oil injection end of the oil injection hole is on the same horizontal line as the upper surface of the upper sealing layer.

[0011] Furthermore, the metal ring is a ring-shaped metal plate.

[0012] Furthermore, the gland secures the floating pad to the inside of the oil receiver with several bolts, and a cylindrical pin is provided between the gland and the floating pad to limit the movement of the floating pad.

[0013] The beneficial effects of this utility model are as follows:

[0014] The V-shaped structure of the sealing ring with its concave inner wall ensures more uniform pressure on the contact surface between the sealing ring and the gland, reducing abnormal wear. Simultaneously, the central sliding layer within the sealing ring reduces vibration at the contact surface when the equipment vibrates, effectively reducing friction and further minimizing wear. The metal rings in the upper and lower sealing layers increase the overall strength of the sealing ring, preventing torsion under vibration conditions and improving its torsional resistance, thus maintaining its performance and extending its service life. Attached Figure Description

[0015] Figure 1 This is an assembly drawing of the oil receiver of this utility model;

[0016] Figure 2 This is a schematic diagram of the connection structure between the floating tile and the sealing ring of this utility model;

[0017] Figure 3 This is a cross-sectional view of the connection structure between the pressure cap and the floating tile of this utility model;

[0018] Figure 4 This is a schematic diagram of the sliding cavity structure before compression of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the sliding cavity after compression according to this utility model.

[0020] The components include: 1. Oil receiver body; 2. Upper operating oil pipe; 3. Pressure cap; 4. Floating tile; 5. Sealing ring; 6. Upper sealing layer; 7. Lower sealing layer; 8. Central sliding layer; 9. Metal ring; 10. Sliding cavity; 11. Oil reservoir hole; 12. Oil injection hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] See Figures 1-5 A floating bearing sealing device for a turbine oil receiver includes an oil receiver body 1, an upper operating oil pipe 2, and an oil delivery mechanism connected to the inner side of the oil receiver body 1. The oil delivery mechanism includes upper and lower pressure caps 3, upper and lower floating bearings 4, and several sealing rings 5. The sealing rings 5 ​​have a V-shaped cross-section with an inner concave sidewall. The sealing rings 5 ​​are divided into an upper sealing layer 6, a lower sealing layer 7, and a central sliding layer 8 for reducing friction between the sealing rings 5 ​​and the pressure caps 3. Metal rings 9 for strengthening the torsional resistance of the sealing rings 5 ​​are embedded in the inner sides of both the upper sealing layer 6 and the lower sealing layer 7.

[0023] In this scheme: during unit operation, pressurized oil flows out from the gap between the upper and lower floating pads 4 and the upper and lower pressure caps 3 in the main body 1 of the oil receiver. Under the rotational force of the operating oil pipe, the pressurized oil flows outward along the cover plate, flows to the oil slinger, and finally collects through the pipeline to the oil collection tank. The floating pads 4 play a certain guiding and stabilizing role in the operation of the upper operating oil pipe 2. Therefore, the sealing effect of the sealing ring 5 between the floating pads 4 and the pressure caps 3 has an important impact. By replacing the original O-ring sealing ring 5 with a V-shaped sealing ring 5 with an inwardly concave inner wall, the pressure on the contact surface between the sealing ring 5 and the pressure cap 3 is made more uniform, reducing the unevenness of the sealing ring 5. The seal ring 5 is subject to constant wear. At the same time, the central sliding layer 8 in the seal ring 5 can reduce the vibration of the contact surface between the seal ring 5 and the gland 3 when the equipment is vibrating. In other words, the friction between the seal ring 5 and the gland 3 will be resolved by the relative vibration of the central sliding layer 8 itself, thereby effectively reducing the friction between the seal ring 5 and the gland 3 and further reducing the wear of the seal ring 5. The metal rings 9 in the upper sealing layer 6 and the lower sealing layer 7 can increase the overall strength of the seal ring 5. Under the condition of vibration generated during equipment operation, the seal ring 5 can be prevented from twisting, improving the anti-torsion performance of the seal ring 5 and extending the service life of the seal ring 5.

[0024] A sliding cavity 10 is provided on the inner side of the central sliding layer 8.

[0025] In this embodiment, the sliding cavity 10 can improve the vibration resistance of the central sliding layer 8 when the unit is running. During the vibration process, the central sliding layer 8 itself can disperse the total vibration between the sealing ring 5 and the pressure cover 3 through the sliding friction of the sliding cavity 10, thereby reducing the friction between the upper surface of the upper sealing layer 6 and the pressure cover 3 and the friction between the lower surface of the lower sealing layer 7 and the floating tile 4, thereby reducing the wear resistance of the sealing ring 5.

[0026] When the sealing ring 5 is pressed between the pressure cap 3 and the floating tile 4, the inner walls of the sliding cavity 10 fit together.

[0027] In this embodiment: when the sliding cavity 10 is pressed and fitted, the central sliding layer 8 can provide stable support for the upper sealing layer 6 and the lower sealing layer 7, maintaining the sealing effect of the sealing ring 5.

[0028] Several oil storage holes 11 are provided inside the sliding cavity 10. When the pressure cap 3 is pressed onto the floating tile 4, the oil storage holes 11 are alternately distributed inside the sliding cavity 10.

[0029] In this embodiment: by adding oil storage holes 11 to the sliding cavity 10, and adding oil to the inside of the sliding cavity 10, the oil can lubricate the central sliding layer 8 inside the sliding cavity 10, reducing the friction of the central sliding layer 8 when sliding through the sliding cavity 10. This improves the shock absorption performance of the central sliding layer 8 while reducing the wear caused by the sliding deformation of the central sliding layer 8. After adding oil to the sliding cavity 10, the oil entering the sliding cavity 10 can be stored in each oil storage hole 11. The oil flowing out from the oil storage hole 11 can evenly penetrate into the sliding cavity 10, making the oil distribution in the sliding cavity 10 more uniform.

[0030] An oil injection hole 12 communicating with the sliding cavity 10 is provided on the inner side of the upper sealing layer 6. The oil injection end of the oil injection hole 12 is on the same horizontal line as the upper surface of the upper sealing layer 6.

[0031] In this embodiment, the oil injection hole 12 can be set so that oil can be manually added to the sliding cavity 10 for lubrication, or the pressure oil can be automatically guided into the sliding cavity 10 when the pressure oil flows between the pressure cover 3 and the floating bearing 4, so that oil can be automatically added to the sliding cavity 10 to maintain the lubrication effect of the sliding cavity 10.

[0032] Metal ring 9 is a ring-shaped metal plate.

[0033] In this embodiment, the metal ring 9 is disposed inside the upper sealing ring 5 and the lower sealing ring 5, which can effectively improve the strength of the upper sealing ring 5 and the lower sealing ring 5. When vibration occurs between the pressure cap 3 and the sealing ring 5, and between the sealing ring 5 and the floating tile 4, the friction between the sealing ring 5 and the pressure cap 3 and the floating tile 4 cannot cause the sealing ring 5 to twist, thereby improving the torsional resistance of the sealing ring 5.

[0034] The pressure cap 3 is fixed to the inside of the oil receiver by several bolts, and a cylindrical pin is provided between the pressure cap 3 and the floating tile 4 to limit the movement of the floating tile 4.

[0035] In this embodiment: the bolts can fix the floating tile 4 inside the oil receiver to prevent the floating tile 4 from loosening inside the oil receiver. The cylindrical pins can limit the angle of the floating tile 4 to prevent the floating tile 4 from rotating inside the oil receiver under the influence of vibration, thereby improving the stability of the floating tile 4 inside the oil receiver.

[0036] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A floating seal device for a water turbine oil collector, comprising an oil collector body (1), an upper operating oil pipe (2), and an oil feeding mechanism fitted and connected to the inner side of the oil collector body (1), the oil feeding mechanism comprising upper and lower pressure covers (3), upper and lower floating shoes (4), and a plurality of sealing rings (5), characterized in that: The sealing ring (5) is V-shaped in cross section with the inner side wall being concave, and is divided into an upper sealing layer (6), a lower sealing layer (7) and a central sliding layer (8) for reducing the friction between the sealing ring (5) and the gland (3), and the inner side of the upper sealing layer (6) and the lower sealing layer (7) is embedded with a metal ring (9) for strengthening the torsion resistance of the sealing ring (5).

2. A floating shoe seal for a hydraulic turbine oil receiver according to claim 1, wherein: The inner side of the central sliding layer (8) is provided with a sliding cavity (10).

3. A floating shoe seal for a hydraulic turbine oil receiver according to claim 2, wherein: When the sealing ring (5) is compressed between the gland (3) and the floating shoe (4), the inner wall of the sliding cavity (10) is in close contact.

4. A floating shoe seal for a hydraulic turbine oil receiver according to claim 2, wherein: The inner side of the sliding cavity (10) is provided with a plurality of oil storage holes (11), which are alternately distributed on the inner side of the sliding cavity (10) when the gland (3) is compressed on the floating shoe (4).

5. A floating ring seal for a hydraulic turbine oil collector according to claim 2 or 3 or 4, characterised in that: The inner side of the upper sealing layer (6) is provided with an oil injection hole (12) in communication with the sliding cavity (10), and the oil injection end of the oil injection hole (12) is on the same horizontal line as the upper surface of the upper sealing layer (6).

6. A floating shoe seal for a hydraulic turbine oil receiver according to claim 1, wherein: The metal ring (9) is a ring-shaped metal plate.

7. A floating shoe seal for a hydraulic turbine oil receiver according to claim 1, wherein: The gland (3) fixes the floating shoe (4) inside the oil receiver through a plurality of bolts, and a cylindrical pin is arranged between the gland (3) and the floating shoe (4) to limit the floating shoe (4).

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