CN212959857U

CN212959857U - Main shaft sealing device of hydraulic generator

Info

Publication number: CN212959857U
Application number: CN202021654768.8U
Authority: CN
Inventors: 陈剑平
Original assignee: Fuzhou Fangyuan Electrical Machinery Co ltd
Current assignee: Fuzhou Fangyuan Electrical Machinery Co ltd
Priority date: 2020-08-11
Filing date: 2020-08-11
Publication date: 2021-04-13
Anticipated expiration: 2030-08-11

Abstract

The utility model provides a hydraulic generator main shaft sealing device can include the seal receptacle and install the sealed lid at the seal receptacle upside, and hydraulic generator main shaft sealing device still includes: the first antiwear ring is arranged on the top side of the seal seat; the first rubber ring is arranged at the bottom side of the first antiwear ring; the second anti-abrasion ring is arranged on the bottom side of the first rubber ring; the second rubber ring is arranged at the bottom side of the second anti-abrasion ring; the third antiwear ring is arranged at the bottom side of the second rubber ring; the first sealing rotating wheel is arranged on the inner side of the first rubber ring; the second sealing rotating wheel is arranged on the inner side of the second rubber ring; the outer wall of the shaft sleeve is fixedly connected with the first sealing rotating wheel and the second sealing rotating wheel, and the inner wall of the shaft sleeve is sleeved on the main shaft. The utility model discloses hydraulic generator main shaft sealing device effectively improves the leakproofness of hydraulic turbine main shaft through forming twice clearance water film, and no water hardly can infiltrate in the cavity.

Description

Main shaft sealing device of hydraulic generator

Technical Field

The utility model relates to a hydraulic generator technical field especially relates to a hydraulic generator spindle seal device.

Background

At present, the main shaft seal of the water turbine mainly has the following modes: 1. the packing main shaft sealing is a main shaft sealing mode which is simple in structure and most widely applied, and mainly comprises a packing box, an asbestos packing and a compression ring. The method comprises the steps of firstly soaking the asbestos packing with paraffin, then coating carbon powder on the asbestos packing, then cutting the asbestos packing into a plurality of sections, filling the sections into a packing box, and finally pressing the sections by a pressing ring after 3-4 circles of packing are filled. Although the main shaft can be sealed, the main shaft has the greatest defects that the asbestos packing is in direct contact with the main shaft, the main shaft is easy to wear when rotating, and water leakage is serious after the wear. 2. The piston type main shaft seal is a relatively common main shaft seal mode and comprises a piston body, a piston, an anti-wear ring, a stop pin, a bolt, a nut and the like, wherein the piston is arranged in the piston body, and the working principle of the piston is that the piston moves downwards through water pressure and rubs against an anti-wear plate, so that water flow is prevented from passing through the piston, and the purpose of sealing the main shaft is achieved. The sealing structure has the disadvantages that the piston is made of water rubber, and the water rubber has water swelling property, so the requirement of the matching tolerance between the piston and the piston body is quite strict, and the success rate of the sealing structure is not high because the manufacturing tolerance of the rubber is difficult to ensure; in addition, if the operation effect is not good when the piston is installed, the piston is difficult to repair, the piston is difficult to recover due to burning in the operation process, and the rubber has the problem of aging, so that the sealing reliability of the piston is affected. 3. The flat plate type main shaft seal is divided into a single flat plate type main shaft seal and a double-layer flat plate type main shaft seal. The single-plate type main shaft seal utilizes the end surface gap formed by a single-layer rubber plate and a rotating ring fixed on the main shaft to seal by water pressure, has simple structure and good sealing performance, the rubber plate is not in direct contact with the surface of the main shaft, and the main shaft is not abraded like a packing main shaft seal. But the disadvantage is that the water leakage is large after the rubber flat plate is worn and lifted in the using process. The double-layer flat plate main shaft seal utilizes the double-layer rubber flat plate and the upper plane and the lower plane of a turntable fixed on a main shaft, and respectively generates pressure to be attached to the turntable in two opposite directions by the action of water pressure of an inner cavity, thereby playing the role of end face seal. Compared with the single-plate type main shaft seal, the structure is more complex, and the seal has the disadvantages of large water leakage after abrasion and during lifting, more complex adjustment and difficult maintenance. 4. The radial seal utilizes a plurality of layers of carbon blocks or other wear-resistant materials to form a radial seal surface with a wear-resistant bushing sleeved on the main shaft along the radial direction in the modes of a mechanical spring and the like, and the radial seal surface is lubricated by clean water, and the seal block can move radially under the action of the spring after being worn to continuously cling to the main shaft bushing.

In summary, the existing water turbine main shaft sealing device can not realize reliable water sealing.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to solving the above-described problems. An object of the utility model is to provide a hydraulic generator main shaft sealing device in solving above problem.

The utility model provides a hydraulic generator main shaft sealing device, can include the seal receptacle and install the sealed lid at the seal receptacle upside, hydraulic generator main shaft sealing device still includes:

the first antiwear ring is arranged on the top side of the seal seat; the first rubber ring is arranged at the bottom side of the first antiwear ring; the second anti-abrasion ring is arranged on the bottom side of the first rubber ring; the second rubber ring is arranged at the bottom side of the second anti-abrasion ring; the third antiwear ring is arranged at the bottom side of the second rubber ring; the first sealing rotating wheel is arranged on the inner side of the first rubber ring, and the distance between the first sealing rotating wheel and the first anti-wear ring, the distance between the first sealing rotating wheel and the second sealing rotating wheel and the distance between the second sealing rotating wheel and the first anti-wear ring, the distance between the first sealing rotating wheel and the second anti-wear ring are preset distances, wherein the preset distances are 0.1-0.4 mm; the second sealing rotating wheel is arranged on the inner side of the second rubber ring, and the distance between the second sealing rotating wheel and the second abrasion-resistant ring, the distance between the second sealing rotating wheel and the third abrasion-resistant ring are preset distances, wherein the preset distances are 0.1-0.4 mm; the outer wall of the shaft sleeve is fixedly connected with the first sealing rotating wheel and the second sealing rotating wheel, and the inner wall of the shaft sleeve is sleeved on the main shaft.

According to the main shaft sealing device of the hydraulic generator, during working, the first sealing rotating wheel and the first antiwear ring, the first rubber ring and the second antiwear ring are in non-contact sealing, so that abrasion is small, and the service life is long; and form the pressure water film in clearance department, tiny pressure water film has not only played sealed effect, still prevents the grit entering.

In order to improve the sealing performance of the main shaft, a first annular groove can be formed by the first antiwear ring, the first rubber ring and the second antiwear ring, and one side of the first sealing rotating wheel is arranged in the first annular groove; the second antiwear ring, the second rubber ring and the third antiwear ring can form a second annular groove, and one side of the second sealing rotating wheel is arranged in the second annular groove.

And, in order to further improve the leakproofness, two sealing ring can be no less than in first ring channel inner wall setting, and two sealing ring can be no less than in second ring channel inner wall setting. The water on the main shaft of the water turbine is decompressed once when passing through the sealing ring once, the water pressure is gradually reduced, the permeability of the water is further reduced, and the tightness of the main shaft of the water turbine is improved.

In the time of in-service use, the first ring of wearing, first rubber ring, the ring is worn to the second, and second rubber ring, the third ring of wearing can pass through the bolt fastening on the seal receptacle.

When a small amount of water permeates into the sealing structure, the top side of the hydraulic generator main shaft sealing device can further comprise a cavity, a drain hole is formed in the sealing seat, the cavity is communicated with the drain hole, and permeated water is drained through the drain hole.

In order to improve the sealing performance between the sealing cover and the main shaft. A sealing ring can be arranged between the sealing cover and the main shaft.

In order to improve the wear resistance of the sealing device, any one of the first wear-resistant ring, the second wear-resistant ring, the third wear-resistant ring, the first sealing rotating wheel and the second sealing rotating wheel can be made of steel, and tungsten carbide metal is sprayed on the surface of any one of the steel.

In the time of in-service use, seal receptacle, first ring, the second ring of wearing, the third ring of wearing can integrated into one piece.

The utility model discloses hydraulic generator main shaft seal device has following technological effect:

1. the application relates to a main shaft sealing device of a hydraulic generator; a first gap water film is formed by the first sealing rotating wheel, the first antiwear ring, the first rubber ring and the second antiwear ring; the second seal runner forms the second clearance water film with second anti-wear ring, second rubber ring, the third ring of wearing, and the leakproofness of hydraulic turbine main shaft is effectively improved to the twice clearance water film, hardly has during water can the infiltration cavity.

2. The application relates to a main shaft sealing device of a hydraulic generator; the pressure is reduced through the sealing ring, the water pressure on the main shaft of the sealing ring is reduced once every time, the permeability of the sealing ring is gradually reduced, and the tightness of the main shaft of the water turbine is improved.

3. The application relates to a main shaft sealing device of a hydraulic generator; the small amount of water that permeates is drained through the cavity and the drain hole.

Other characteristic features and advantages of the invention will become apparent from the following description of exemplary embodiments, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. In the drawings, like reference numerals are used to indicate like elements. The drawings in the following description are directed to some, but not all embodiments of the invention. For a person skilled in the art, other figures can be derived from these figures without inventive effort.

Fig. 1 is a view exemplarily showing a structure of a main shaft sealing device of a hydraulic generator according to the present invention;

fig. 2 exemplarily shows a structure view of the seal holder of the present invention;

in the figure:

100. a sealing seat; 200. a sealing cover; 10. a first antiwear ring; 20. a first rubber ring; 11. a second anti-wear ring; 21. a second rubber ring; 12. a third antiwear ring; 30. a first sealing runner; 31. a second sealing runner; 40. a shaft sleeve; 300. a main shaft; 50. a first annular groove; 51. a second annular groove; 60. sealing the circular ring; 70. a bolt; 80. a cavity; 81. a drain hole; 90. and (5) sealing rings.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The main shaft sealing device of the hydraulic generator is described in detail below with reference to the accompanying drawings and embodiments.

Examples

As shown in fig. 1 to 2, a main shaft sealing device of a hydro-generator may include a sealing seat 100 and a sealing cover 200 installed on an upper side of the sealing seat 100, and further includes:

a first antiwear ring 10 arranged on the top side of the seal seat 100; the first rubber ring 20 is arranged at the bottom side of the first antiwear ring 10; a second anti-abrasion ring 11 disposed at the bottom side of the first rubber ring 20; a second rubber ring 21 disposed at a bottom side of the second anti-abrasion ring 11; the third antiwear ring 12 is arranged at the bottom side of the second rubber ring 21; the first sealing rotating wheel 30 is arranged on the inner side of the first rubber ring 20, and the distances among the first sealing rotating wheel, the first antiwear ring 10, the first rubber ring 20 and the second antiwear ring 11 are preset distances, wherein the preset distances are 0.1-0.4 mm; the second sealing rotating wheel 31 is arranged on the inner side of the second rubber ring 21, and the distances among the second sealing rotating wheel, the second anti-wear ring 11, the second rubber ring 21 and the third anti-wear ring 12 are preset distances, wherein the preset distances are 0.1-0.4 mm; the outer wall of the shaft sleeve 40 is fixedly connected with the first sealing rotating wheel 30 and the second sealing rotating wheel 31, and the inner wall of the shaft sleeve is sleeved on the main shaft 300.

In a preferred embodiment, the first antiwear ring 10, the first rubber ring 20, and the second antiwear ring 11 may form a first annular groove 50, and one side of the first seal runner 30 is disposed in the first annular groove 50; the second wear ring 11, the second rubber ring 21, and the third wear ring 12 may form a second annular groove 51, and one side of the second seal runner 31 is disposed in the second annular groove 51. The sealing runner is arranged in the annular groove, so that the sealing performance of the annular groove is improved.

In a preferred embodiment, the inner wall of the first annular groove 50 may be provided with not less than two sealing rings 60, and the inner wall of the second annular groove 51 may be provided with not less than two sealing rings 60. The sealing ring 60 improves the sealing performance of the main shaft 300.

In a preferred embodiment, the first wear ring 10, the first rubber ring 20, the second wear ring 11, the second rubber ring 21 and the third wear ring 12 may be fixed on the seal housing 100 by bolts 70.

In a preferred embodiment, the top side of the main shaft sealing device of the hydraulic generator may further include a cavity 80, the sealing seat 100 is provided with a drainage hole 81, the cavity 80 is communicated with the drainage hole 81, and the infiltrated water is drained through the drainage hole 81.

In a preferred embodiment, a sealing ring 90 may be disposed between the sealing cover 200 and the main shaft 300, and the sealing performance of the main shaft is improved by the sealing ring 90.

In a preferred embodiment, any one of the first antiwear ring 10, the second antiwear ring 11, the third antiwear ring 12, the first seal runner 30 and the second seal runner 31 may be made of steel, and a tungsten carbide metal is sprayed on the surface of any one of the steel, so that the antiwear performance of the seal device is improved by spraying the tungsten carbide metal.

In a preferred embodiment, the seal seat 100, the first wear ring 10, the second wear ring 11, and the third wear ring 12 may be integrally formed, and the installation performance is improved by integrally forming several parts.

The application hydraulic generator main shaft sealing device work principle:

when the water turbine works, the main shaft rotates to drive the shaft sleeve to rotate, the first sealing rotating wheel and the second sealing rotating wheel are further driven to rotate, and at the moment, a first gap water film is formed among the first sealing rotating wheel, the first anti-wear ring, the first rubber ring and the second anti-wear ring; a second gap water film is formed between the second sealing rotating wheel and the second anti-abrasion ring, the second rubber ring and the third anti-abrasion ring, the tightness of a main shaft of the water turbine is effectively improved through the second gap water film, and almost no water can permeate into the sealing cover.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional like elements in the article or device comprising the element.

The above embodiments are merely for illustrating the technical solutions of the present invention and are not to be construed as limiting, and the present invention is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that various modifications and equivalent substitutions may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all the modifications and equivalents should be covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a hydraulic generator main shaft sealing device, includes seal receptacle (100) and installs sealed lid (200) of seal receptacle (100) upside, its characterized in that, hydraulic generator main shaft sealing device still includes:

the first antiwear ring (10) is arranged on the top side of the seal seat (100);

the first rubber ring (20) is arranged at the bottom side of the first antiwear ring (10);

the second anti-abrasion ring (11) is arranged on the bottom side of the first rubber ring (20);

a second rubber ring (21) arranged on the bottom side of the second wear-resistant ring (11);

the third antiwear ring (12) is arranged at the bottom side of the second rubber ring (21) and is arranged at the bottom side of the seal seat (100);

the first sealing rotating wheel (30) is arranged on the inner side of the first rubber ring (20), and the distance between the first sealing rotating wheel and the first antiwear ring (10), the distance between the first sealing rotating wheel and the second sealing rotating wheel (20) and the distance between the second sealing rotating wheel and the second antiwear ring (11) are preset distances, wherein the preset distances are 0.1-0.4 mm;

the second sealing rotating wheel (31) is arranged on the inner side of the second rubber ring (21), and the distance between the second sealing rotating wheel and the second wear-resistant ring (11), the distance between the second sealing rotating wheel and the third wear-resistant ring (21) and the distance between the third sealing rotating wheel and the third wear-resistant ring (12) are preset distances, wherein the preset distances are 0.1-0.4 mm;

and the outer wall of the shaft sleeve (40) is fixedly connected with the first sealing rotating wheel (30) and the second sealing rotating wheel (31), and the inner wall of the shaft sleeve is sleeved on the main shaft (300).

2. The main shaft sealing device of a hydro-generator according to claim 1,

the first antiwear ring (10), the first rubber ring (20) and the second antiwear ring (11) form a first annular groove (50), and one side of the first sealing rotating wheel (30) is arranged in the first annular groove (50);

the second wear ring (11), second rubber ring (21) the third wear ring (12) form second ring channel (51), second seal runner (31) one side sets up in second ring channel (51).

3. The main shaft sealing device of a hydro-generator according to claim 2,

at least two sealing rings (60) are arranged on the inner wall of the first annular groove (50),

at least two sealing rings (60) are arranged on the inner wall of the second annular groove (51).

4. The main shaft sealing device of a hydro-generator according to claim 1,

the first ring (10) of wearing, first rubber ring (20), second ring (11) of wearing, second rubber ring (21) the third ring (12) of wearing is fixed through bolt (70) on seal receptacle (100).

5. The main shaft sealing device of a hydro-generator according to claim 1,

the top side of the main shaft sealing device of the hydraulic generator further comprises a cavity (80), a drain hole (81) is formed in the sealing seat (100), and the cavity (80) is communicated with the drain hole (81).

6. The main shaft sealing device of a hydro-generator according to claim 1,

a sealing ring (90) is arranged between the sealing cover (200) and the main shaft (300).

7. The main shaft sealing device of the hydraulic generator according to claim 1, wherein the first antiwear ring (10), the second antiwear ring (11), the third antiwear ring (12), the first sealing runner (30) and the second sealing runner (31) are made of steel, and the surface of any steel is coated with tungsten carbide.

8. The main shaft sealing device of a hydro-generator according to claim 1,

seal receptacle (100) first ring (10) of wearing wear-resisting second ring (11) ring (12) integrated into one piece are worn to the third.