CN212717967U - Hydraulic generator thrust oil groove sealing device with acceleration - Google Patents

Abstract

The invention relates to the technical field of auxiliary devices of power generation systems, in particular to a thrust oil groove acceleration sealing device of a hydraulic generator, which can meet the requirements of equipment on various pressures in dynamic, static and running processes from the structural point of view and thoroughly solve the problems of oil throwing, oil leakage and oil mist of a generator set; the device comprises an outer sealing body, an inner sealing body A, radial sealing teeth, an inner sealing body B, axial T-shaped sealing teeth, an air sealing plate, a positioning baffle plate, an accelerating sealing unit, a volute sealing cavity, an air supply device, a gravity one-way valve, an air inlet pipeline, an electronic filtering device, an oil return gravity releaser and an oil mist pipeline.

Description

Hydraulic generator thrust oil groove sealing device with acceleration

Technical Field

The invention relates to the technical field of auxiliary devices of power generation systems, in particular to an accelerating sealing device for a thrust oil groove of a hydraulic generator.

Background

At present, the sealing in the same industry at home and abroad adopts contact type sealing, brush type sealing and the contact of various rotating parts and sealing materials to achieve the sealing purpose. Because a gap is formed between the deflection of the rotating part and the sealing material due to long-term friction in the operation process, and the sealed gas and liquid are easy to leak, the problem of sealing the large-sized rotating mechanical bearing cannot be solved for a long time.

The research and development strength of China in the sealing field is high, the technical level of a sealing product is behind the advanced and developed countries in the world, so that research and development work is carried out from two aspects of basic research and application research by tightly surrounding the urgent need of the country and combining the advantages of the country, the research and development level is improved as soon as possible in a short time, and high and new products with independent intellectual property rights are researched and developed, so that the requirements of the current hydropower sealing industry on rapid development are met.

The thrust bearing is sealed in a contact type, the contact sealing tooth material of the thrust bearing and a shaft adopts a carbon crystal block for contact sealing, the oil mist generation mechanism is that a runner plate, a thrust head and a shaft collar drive static oil to move in the running process of a unit from the operation experience of an oil mist actual condition power plant of an oil groove of the thrust bearing of a generator, and a movable part and a static part of a bearing generate heat in friction in work, so that the oil temperature is increased, the oil surface in the oil groove splashes to the outer wall of the oil groove under the action of centrifugal force, stirring and forming a parabola, so that oil drops and oil mist overflow from gaps such as an oil groove cover plate, an oil baffle ring and a combined surface, and. Although the generator oil groove adopts contact type sealing in the manufacturing design, the actual effect of preventing oil mist is not good. The thrust bearing structure of the unit carries out comprehensive analysis by using the sources of oil mist thrown out from the outside and oil mist thrown in the inside of the bearing oil groove, and the main reason for causing the serious oil mist of the unit is that the sealing structure of the sealing cover of the bearing oil groove is unreasonable, so that a main leakage channel for throwing the oil mist from the outside is formed. The dynamic seal of the oil groove sealing cover is a double-layer carbon crystal block contact seal, the double-layer carbon crystal block forms a cavity, a large amount of oil climbs to the carbon crystal sealing block of the sealing cover along the shaft, meanwhile, the double-layer carbon crystal block of the sealing cover needs to be tightly attached to the large shaft by means of spring action to form zero-gap seal, the friction coefficient of the carbon crystal block self material is large, the lubricating effect is poor, the temperature of the contact area of the carbon crystal block and the large shaft is increased, the main shaft is locally deformed due to heating to cause the change of a unit shafting, the safe operation of the unit is influenced, therefore, the carbon crystal block and the large shaft cannot achieve real zero-gap seal, the zero-gap seal is a main leakage channel of oil mist, the problems of oil throwing, oil leakage and oil mist existing in unit bearing sealing are solved, and the problem to be solved urgently.

Disclosure of Invention

In order to solve the technical problems, the invention provides the thrust oil groove acceleration sealing device of the hydraulic generator, which can structurally meet the requirements of equipment on various pressures in dynamic, static and running states and thoroughly solves the problems of oil throwing, oil leakage and oil mist of a generator set.

The invention discloses an accelerating sealing device for a thrust oil groove of a hydraulic generator, which comprises an outer sealing body, an inner sealing body A, radial sealing teeth, an inner sealing body B, axial T-shaped sealing teeth, an air sealing plate, a positioning baffle plate, an accelerating sealing unit, a volute sealing cavity, an air supply device, a gravity one-way valve, an air inlet pipeline, an electronic filtering device, an oil return gravity releaser and an oil mist pipeline, wherein the accelerating sealing unit consists of a supporting plate, cyclone blades and a blade cover plate, the side of the plane of the supporting plate, which is close to a rotating shaft, is designed into an upward convex arc shape, the cyclone blades are uniformly distributed along with the upward convex arc shape of the plane of the supporting plate, the inclination direction of the cyclone blades is.

Compared with the prior art, the invention has the beneficial effects that: reduce bearing oil groove turbine oil loss, alleviate the pollution to generator parts such as rotor bar, rotor spoke, improve generating set operational environment, improve generating set work efficiency, reduce the work load that the generator maintained the number of times and maintained, improve the economic benefits of power plant, sealing device with higher speed has made a great breakthrough in large-scale rotatory mechanical seal field for industry initiative. The accelerating sealing device can meet the requirements of various pressures of equipment in dynamic, static and running states structurally, and the problems of oil throwing, oil leakage and oil mist existing in a generator set are thoroughly solved. The successful development of the project fills the blank in the field of domestic and foreign sealing industries and can replace related sealing imported products. The sealing technology can be applied to sealing under the environments of high-temperature high-pressure, low-temperature normal-pressure, rotary fluid and the like. The sealing device has wide popularization and application values in sealing of hydraulic power generation equipment, sealing of nuclear power generation equipment, sealing of thermal power generation equipment and the like, and has wide market prospects.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic top view of the structure of the present invention;

FIG. 3 is a schematic view of a portion of the structure of the present invention;

FIG. 4 is a schematic perspective view of the present invention;

in the drawings, the reference numbers: 1. CX — inner race a; 2. CX — inner race B; 3. CX-seal ring; 4. CX-positioning baffle; 5. CX-seal tooth; 6. CX-gas seal plate; 7. an oil return pipe; 8. positioning bolts M12 × 60; 9. a gasket 12; 10. a nut 12; 11. bolt M12 × 60; 12. hexagon socket head cap screw M12 × 35; 13. bolt M16 x 65; 14. 16 washers; 15. a nut; 16. positioning bolts M16 × 65; 17. CX — accelerated sealing unit; 18. CX-support block A; 19. CX-support block B; 20. bolt M12 × 25; 21. a stopper washer 12; 22. a cylindrical spring; 23. a gas supply device gasket; 24. the air supply device connecting pipe 1; 25. a GL-type linker; 26. the air supply device connecting pipe 2; 27. &8 oil resistant rubber strips; 28. bolt M12 × 35; 29. a butterfly valve DN 40; 30. CX-gas supply device; 31. a filter device connecting pipe; 32. a CX-electronic filtration device; 33. CX — getter device; 34. bolt M10 × 20; 35. a gasket 10; 36. hexagon socket head cap screw M6 × 55; 37. A nut 6; 38. a gasket 6; 39 sealing the screw cap; 40. the sealing nut is a sealing gasket.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example (b):

(1) innovative technology of accelerating sealing unit structure

The device comprises a supporting plate, cyclone blades and a blade cover plate, wherein the side, close to a rotating shaft, of a plane of the supporting plate is designed to be an upward convex arc shape, the cyclone blades are uniformly distributed along with the upward convex arc shape on the plane of the supporting plate, the inclination direction of the cyclone blades is opposite to the rotating direction of the rotating shaft, and a blade cover plate structure is adopted above the cyclone blades.

(2) Innovative technology of volute sealing cavity

The acceleration sealing unit rotates along with the rotating shaft to generate proper wind pressure, the generated wind pressure smoothly enters the volute sealing chamber, most of the wind pressure entering the volute sealing chamber is guided to a specified position through an external pipeline to be observed, the rest small part of the wind pressure is remained in the volute sealing chamber, and the wind pressure stored in the volute sealing chamber can effectively prevent oil mist below from escaping, so that a good sealing effect is achieved.

(3) Uniqueness technology of shaft end oil mist prevention device

The upper chamber of the sealed outer body is provided with an air inlet interface, the lower chamber of the sealed outer body is provided with an oil mist absorption interface, the lower chamber of the sealed outer body is provided with a CX-electronic filtering device, an oil collection gravity releaser, and the upper chamber of the sealed outer body is provided with a CX-air supply device. In the operation process of the unit, the CX-gas supply device arranged on the upper chamber and the CX-electronic filtering device arranged on the lower chamber are both in a closed state. When the temperature detection device detects temperature rise or the oil mist detection device detects oil mist, the CX-gas supply device arranged on the upper cavity and the CX-electronic suction filter device arranged on the lower cavity start to work; when a gravity release for collecting oil is installed in the CX-absorption electronic filtering device and a certain weight of oil is collected, the gravity release for collecting oil is opened to release the oil to the oil tank, and simultaneously, the gravity release for collecting oil is closed. When the temperature detecting device detects that the temperature is normal or the oil mist detecting device detects that no oil mist exists, the CX-gas supply device arranged on the upper cavity and the CX-electronic filtering device arranged on the lower cavity stop working.

The sealing material of the acceleration sealing device has the following advantages compared with the sealing material of other structures:

the material is a non-metal polymer synthetic material, has the characteristics of oil resistance, high temperature resistance, aging resistance, chemical corrosion resistance and the like, has a good self-lubricating function and has a very small friction coefficient. And the T-shaped sealing teeth are in contact with the rotating shaft by adopting a linear contact surface, so that heat generated by friction between the T-shaped sealing teeth and the rotating shaft is reduced, and a good sealing effect is achieved.

The insulating property is excellent, and the shaft current can not be generated when the rotating shaft runs. Need not to install insulating cover additional in the installation, maintenance easy maintenance have strengthened the security of unit operation.

The multi-equal-division function is that the T-shaped sealing tooth is equally divided into a plurality of even-numbered equal parts according to the circumferential direction.

The compensation and retreat functions are that after the T-shaped seal teeth are divided into equal parts, each equal part can move forward and retreat in a radial direction, the sensitivity is high, and the T-shaped seal teeth can be kept to track and run with the rotating shaft all the time under the condition that the rotating shaft swings in the radial direction.

The limiting function is that the accurate limiting device can effectively control the advance of the T-shaped sealing teeth.

According to the thrust oil groove acceleration sealing device for the hydraulic generator, the installation mode, the connection mode or the arrangement mode of all the components are common mechanical modes, and the specific structures, models and coefficient indexes of all the components are self-contained technologies, so that the thrust oil groove acceleration sealing device can be implemented as long as the beneficial effects of the thrust oil groove acceleration sealing device can be achieved, and further description is omitted.

The invention relates to a thrust oil groove acceleration sealing device of a hydraulic generator, which comprises a sealing body, a sealing cover and a sealing cover, the directional terms "up, down, left, right, front, back, inside, and outside, and vertical and horizontal" included in the term merely represent the orientation of the term in the normal use state, or be a trivial term understood by those skilled in the art, and should not be considered as limiting the term, at the same time, the numerical terms "first," "second," and "third," etc. do not denote any particular quantity or order, but rather are used to distinguish one from another, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (1)

1. The utility model provides a hydraulic generator thrust oil groove sealing device with higher speed, its characterized in that, includes outer seal body, interior seal body A, radial seal tooth, interior seal body B, the sealed tooth of axial T type, gas seal plate, positioning baffle, accelerated seal unit, spiral case seal chamber, air feeder, gravity check valve, admission line, electronic filter equipment, oil return gravity releaser and oil mist pipeline, accelerated seal unit comprises backup pad, whirlwind blade, blade cover plate, and the backup pad plane is close to the pivot side and designs to be last convex arc, and whirlwind blade is along with the last convex arc evenly distributed in backup pad plane, and the whirlwind blade incline direction is opposite with the pivot direction of rotation, and the whirlwind blade top adopts the blade cover plate structure.

Images