Water turbine brake sealing ring

Abstract

The utility model provides a water turbine brake sealing ring, which relates to the field of sealing and comprises a sliding unit of a brake and a sealing ring, the sealing ring is sleeved on the outer surface of the sliding unit in a limiting manner, the section of the sealing ring is in an isosceles triangle shape, and the triangle of the section of the sealing ring is subjected to rounding treatment. According to the water turbine brake sealing ring, the sealing ring is connected in the limiting groove of the sliding unit in a sleeved mode, when the sealing ring moves up and down along with the sliding unit, due to the fact that the sealing ring is in surface contact with the inner wall of the limiting groove, the contact area of the sealing ring and the limiting groove is increased, and the sealing ring is not prone to deformation. And when the sealing ring is stressed, the sealing ring can deform at the position of the cavity, the friction between the other end of the sealing ring and the limiting groove cannot be changed in the extrusion process, therefore, torsion of the sealing ring can be resisted, and a good sealing effect can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sealing technical field, concretely is a water turbine brake sealing ring. BACKGROUND

[0002] The water turbine generator is a generator that converts water energy into electric energy by using a water turbine as a prime mover. When water flows through the water turbine, the water energy is converted into mechanical energy, and the rotating shaft of the water turbine drives the rotor of the generator to convert the mechanical energy into electric energy and output. It is the main power equipment for producing electric energy in a hydropower station. The brake (also known as a brake) is an important equipment for stopping and maintenance of the generator in the water power generation system, and the key to determine the performance of the brake is the sealing element.

[0003] A novel water power generator brake sealing device is disclosed in Chinese patent application publication CN215806282U, which comprises a cylinder body, a gas piston is assembled in the cylinder body, a hydraulic piston is located between the gas piston and the bottom wall of the cylinder body, two guide belts are assembled on the outer wall of the gas piston, and a large gas sealing pad is also provided on the outer wall of the gas piston and directly contacts the inner wall of the cylinder body; an oil sealing pad is assembled on the outer wall of the hydraulic piston, and the outer wall of the oil sealing pad also directly contacts the inner wall of the cylinder body.

[0004] The novel water power generator brake sealing device can increase the clamping degree between the large gas sealing pad on the gas piston and the gas piston by the setting of the large gas sealing pad on the gas piston and the setting of the inner pad ring, and can avoid the occurrence of poor sealing effect caused by the ectopic large gas sealing pad when the gas piston slides up and down. In addition, the setting of the oil sealing pad on the hydraulic piston can increase the sealing effect between the hydraulic piston and the inner wall of the cylinder body. However, the sealing pad in this technical solution is divided into multiple types according to the purpose, and multiple sealing pads are set to solve the problem of easy leakage of O-shaped sealing ring in the prior art, and the technical solution is relatively complex. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a water turbine brake sealing ring, which relatively simply solves the problem of easy leakage of O-shaped sealing ring in the background art.

[0006] TECHNICAL SCHEME

[0007] To achieve the above purpose, the utility model realizes the following technical scheme: a water turbine brake sealing ring, comprising a sliding unit of a brake, and a sealing ring, the sealing ring is sleeved on the outer surface of the sliding unit, the cross-sectional shape of the sealing ring is an isosceles triangle, the three angles of the cross-sectional triangle of the sealing ring are all chamfered, the right angle side of the sealing ring is provided with a cavity for accommodating deformation, and the cavity is located at the center of the bottom side.

[0008] Further, the outer surface of the sliding unit is provided with a limiting groove, and the sealing ring is sleeved in the limiting groove, and the depth of the limiting groove at least satisfies that the cavity part is located in the limiting groove.

[0009] Further, the diameter of the rounded corner of the bottom angle of the cross section of the sealing ring is smaller than the diameter of the rounded corner of the top angle.

[0010] Further, the included angle between the two equal sides of the cross section of the sealing ring is between 65 degrees and 75 degrees.

[0011] Further, the material of the sealing ring is elastic polyurethane material.

[0012] Further, the diameters of the upper and lower sliding parts of the sliding unit are different, each sliding part is provided with a limiting groove, and the inner diameter of the sealing ring is the same as the outer diameter of the limiting groove.

[0013] The utility model discloses the beneficial effect lies in:

[0014] 1. The sealing ring of the water turbine brake, by the sealing ring is sleeved in the limiting groove of the sliding unit, when the sealing ring follows the sliding unit and moves up and down, because the surface contact between the sealing ring and the inner wall of the limiting groove increases the contact area with the limiting groove, so that the rotation of the sealing ring can be avoided, and because the cavity is arranged, the sealing ring will be deformed at the cavity during the stress process, and the other end will not change the friction with the limiting groove during the extrusion process, so that the torsion of the sealing ring can be resisted, and the contact area with the sliding surface can be increased by increasing the diameter of the rounded corner of the top angle of the sealing ring, so that good sealing effect can be achieved.

[0015] 2. The sealing ring of the water turbine brake, by setting the material of the sealing ring is elastic polyurethane material, can combine material characteristics excellent wear resistance, hardness, high strength, good elasticity, low temperature resistance, good oil resistance and sealing ring use condition are adapted. DRAWINGS

[0016] Fig. 1 It is the structure schematic drawing of the utility model;

[0017] Fig. 2 It is the sealing ring half cut schematic drawing of the utility model;

[0018] Fig. 3 It is the cross section schematic drawing of the sealing ring of the utility model.

[0019] Among them, 1, the sealing ring;2, the sliding unit;201, the limiting groove;101, the cavity. CONCRETE IMPLEMENTATION

[0020] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0021] Referring to Figs. 1-3 A water turbine brake sealing ring, the brake cylinder exists the piston that moves up and down, the piston has three cavities, the brake is three cavity double piston structure reset air cavity, brake air cavity and top rotor oil cavity, reset air cavity is upper cavity, brake air cavity is middle cavity, and top rotor oil cavity is lower cavity;According to the design of oil, gas cavity separation. Brake has air pressure reset function, when brake or jacking pressure is removed, the piston can reset quickly when the upper cavity of brake admits air. Injecting compressed air or pressure oil can lift the piston. Among them, after the middle cavity of the piston is injected with compressed air, the brake will exert the brake performance, the upper cavity is injected with compressed air, the piston moves down to brake reset;After adding pressure oil in the lower cavity of the piston, the brake force exerts the performance of the jack. The sliding unit 2 of the brake and the sealing ring 1 are included, the sealing ring 1 is sleeved on the outer surface of the sliding unit 2, the cross section shape of the sealing ring 1 is isosceles triangle, the cross section triangle of the sealing ring 1 is rounded, the straight angle side of the sealing ring 1 is provided with a cavity 101 for accommodating deformation, the cavity 101 is located at the center of the bottom edge, and the bottom part is extruded during the upward sliding process of the sliding unit 2. Due to the existence of the cavity 101, the bottom part is deformed and protrudes outward.

[0022] The outer surface of the sliding unit 2 is provided with a limiting groove 201, the sealing ring 1 is sleeved in the limiting groove 201, and the depth of the limiting groove 201 at least meets that part of the cavity 101 is located in the limiting groove 201. Through such setting, the sealing ring 1 and the sliding unit 2 can be prevented from falling off.

[0023] The diameter of the rounded corner of the bottom angle of the cross section triangle of the sealing ring 1 is smaller than that of the top corner, by increasing the diameter of the rounded corner at the top corner, the top corner part can be deformed during extrusion to increase the area of the contact surface.

[0024] The included angle between the two equal leg sides of the cross section triangle of the sealing ring 1 is between sixty-five degrees and seventy-five degrees, by limiting the included angle range of the top corner of the sealing ring 1, the contact area with the inner ring of the limiting groove 201 can be increased, so that the sealing ring 1 can be prevented from being twisted.

[0025] The material of the sealing ring 1 is elastic polyurethane material, also known as thermoplastic polyurethane rubber, which has the outstanding characteristics of excellent wear resistance, high hardness, high strength, good elasticity, low temperature resistance and good oil resistance, which can adapt to the working conditions of the sealing ring 1.

[0026] The upper and lower sliding parts of the sliding unit 2 are different in diameter, each sliding part is provided with a limiting groove 201, the inner diameter of the sealing ring 1 is same as the outer diameter of the limiting groove 201, through the setting, the effect of bidirectional sealing can be formed.

[0027] In use, the sealing ring 1 is sleeved in the limiting groove 201 of the sliding unit 2, when the sealing ring 1 moves up and down along with the sliding unit 2, because the face contact between the sealing ring 1 and the inner wall of the limiting groove 201 increases the contact area of the limiting groove 201, the rotation of the sealing ring 1 can be avoided, and because the cavity 101 is arranged, the deformation of the sealing ring 1 occurs at the cavity 101 when the sealing ring 1 is stressed, and the other end does not change the friction with the limiting groove 201 in the extrusion process, so that the torsion of the sealing ring 1 can be resisted, the contact area with the sliding surface can be increased by increasing the diameter of the rounded corner at the top corner of the sealing ring 1, so that the good sealing effect can be achieved.

[0028] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions.

[0029] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the application concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A sealing ring for a hydraulic turbine brake, comprising a sliding unit (2) of the brake, and a sealing ring (1), characterized in that: The sealing ring (1) is sleeved on the outer surface of the sliding unit (2), the cross-sectional shape of the sealing ring (1) is an isosceles triangle, the three angles of the cross-sectional triangle of the sealing ring (1) are all chamfered, the right angle side of the sealing ring (1) is provided with a cavity (101) for accommodating deformation, and the cavity (101) is located at the center of the bottom side.

2. A sealing ring for a hydraulic turbine brake as defined in claim 1, characterized in that: The outer surface of the sliding unit (2) is provided with a limiting groove (201), the sealing ring (1) is sleeved in the limiting groove (201), and the depth of the limiting groove (201) at least meets the requirement that the cavity (101) is partially located in the limiting groove (201).

3. A seal ring for a hydraulic turbine brake as defined in claim 1, wherein: The chamfered diameter of the bottom angle of the cross-sectional triangle of the sealing ring (1) is smaller than the chamfered diameter of the top angle.

4. A seal ring for a hydraulic turbine brake as defined in claim 1, wherein: The included angle between the two equal sides of the cross-sectional triangle of the sealing ring (1) is between sixty-five degrees and seventy-five degrees.

5. A seal ring for a hydraulic turbine brake as defined in claim 1, wherein: The material of the sealing ring (1) is elastic polyurethane material.

6. A seal ring for a hydraulic turbine brake as defined in claim 1, wherein: The diameters of the upper and lower sliding parts of the sliding unit (2) are different, each sliding part is provided with a limiting groove (201), and the inner diameter of the sealing ring (1) is the same as the outer diameter of the limiting groove (201).

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